CONTACTLESS COUPLER, PRECAST STRUCTURE AND PRECAST STRUCTURE CONSTRUCTION METHOD USING THE SAME

Description

TECHNICAL FIELD

The present invention relates to a contactless coupler and a precast structure manufactured using the same. More specifically, the present invention relates to a contactless coupler capable of sufficiently securing workability and efficiency in precast structure construction by allowing connecting rebars drawn from block-out spaces (S) of precast structures to be connected to each other in a contactless manner without direct connection using a coupler when connecting the connecting rebars to each other, a precast structure manufactured using the same, and a construction method thereof.

BACKGROUND ART

FIG. 1A shows an exemplary view of coupler construction of precast members PC1 and PC2 in the related art.

That is, the precast members PC1 and PC2 are constructed by being separately manufactured and connected, and for the connection construction, it can be seen that connecting rebars CR1 and CR2 drawn from the precast members in block-out parts exposed to the outside are connected to each other using couplers 1 and 2.

That is, the connection is made in a manner of directly fastening connecting rebars ET1 and ET2 using the couplers 1 and 2 by fastening the female coupler 2 to the connecting rebar of one precast member PC1, fastening the male coupler 1 to the connecting rebar of the other precast member PC2, and inserting and fastening the male coupler 1 into the female coupler 2.

Accordingly, since couplers 1 and 2 are connected to the connecting rebars ET1 and ET2 in a manner of rotating and fastening threaded portions, bolts, and nuts, a bolt and nut fastening work is repeated, and thus a problem of having to sacrifice some of the workability and constructability occurs. In addition, when the connecting rebars ET1 and ET2 are not located on the same central axis due to manufacturing or construction errors of the precast members PC1 and PC2, in some cases, it is not possible to insert and fasten the male coupler 1 into the female coupler 2, and since the couplers 1 and 2 are very expensive, there is a limit to securing economic efficiency.

FIG. 1B shows an exemplary view of connection construction using an enlarged head 20 of a concrete member in the related art.

The concrete member may be manufactured as a precast member but may also be constructed by pouring and curing cast-in-place concrete using formwork.

Accordingly, it can be seen that before pouring cast-in-place concrete on two adjacent concrete members, the connecting rebars 10 may be set in an X-shape, and the concrete members may be connected to each other by pouring cast-in-place concrete.

In this case, it can be seen that an enlarged head 21 may be formed at a split end 20 of the connecting rebar 10 to surround the end, thereby increasing the anchoring performance of the end of the connecting rebar 10.

That is, the connecting rebar 10 is used as a deformed rebar, but it can be seen that, in order to increase friction while increasing a contact area with concrete, a ring-shaped enlarged head 20 may be integrated in advance with the end 20 of the connecting rebar 10.

FIG. 1C shows an exemplary view of a fixing device for tendons that installs tendons in the concrete member (girder or the like) in the related art and mounts the tendons to the concrete member.

Tendons are used to introduce prestress into concrete members, and the tendons are usually made of PC steel strands so that the prestress is introduced through a reaction force caused by anchoring after tension.

Accordingly, an anchoring device 30 is used to anchor the tendons to the concrete member,

The anchoring device 30 has a basic structure including an anchoring plate 31 and an anchor head 32, and

• • tendons 33 set to pass through the anchoring plate 31 are tensioned and then anchored by a wedge (not shown) inserted into a through hole of the anchor head 32.

In this case, a large number of tendons 33 are usually installed, and are installed inside a sheath 34 when installed using a post-tension method.

In the anchoring process, since significant local stress is concentrated on the concrete member 35 when the anchoring plate 31 comes into contact with the concrete member 35, it can be seen that a reinforcing rebar 36 is formed integrally with the anchor head 37 inside the concrete member.

Accordingly, it can be seen that in order to connect the precast concrete members (precast members) to each other, in the related art, a method of simply connecting a connecting rebar directly using a coupler and then finishing the connecting with finishing grouting may be used, and it can be seen that in order to secure the anchorage performance of the connecting rebar, a large number of enlarged heads may be formed to be spaced apart on the connecting rebar,

• • it can be seen that when prestress is introduced by tendons, the reinforcing rebar 36 may be formed in a spiral shape to provide reinforcement against the local stress caused by the introduced prestress, but it can be seen that the reinforcing rebar 36 is only used as a means of reinforcing concrete by the introduction of prestress.

DISCLOSURE

Technical Problem

Accordingly, the present invention is directed to providing a contactless coupler capable of securing sufficient anchoring performance required for connection while allowing connecting rebars to be connected to each other in a contactless manner in order to connect the precast structures to each other in externally exposed spaces (block-out spaces (S)), rather than a manner of mechanically connecting the connecting rebars by directly contacting the connecting rebars like a coupler in the related art, and a precast structure manufactured using the same.

In addition, the present invention is directed to providing a contactless coupler capable of securing workability and constructability while effectively resisting shear and separation forces at a connection joint surface by enhancing a binding force by wrapping connecting rebars in connecting rebars to each other in a contactless manner, thereby allowing quick and economical connection work of precast structures, and a precast structure manufactured using the same.

Technical Solution

A contactless coupler of the present invention to achieve the above problem includes connecting rebars drawn from communicating block-out spaces (S) of precast structures adjacent to each other, respectively and a plurality of contactless ring connection members disposed to be spaced apart around the connecting rebars that are adjacent and separated from each other and fill the block-out spaces (S) while surrounding the connecting rebars, in which the connecting rebars adjacent to each other are connected to each other without a coupler by a frictional force generated by the contactless ring connection members being buried in a finishing grout with which the block-out spaces (S) are filled.

Also, a precast structure manufactured using a contactless coupler of the present invention including connecting rebars drawn from block-out spaces (S) adjacent to and communicating with each other includes a plurality of contactless ring connection members disposed to be spaced apart around the connecting rebars that are adjacent and separated from each other and fill the block-out spaces (S) while surrounding the connecting rebars, in which the connecting rebars adjacent to each other are connected to each other without a coupler by a frictional force generated by the contactless ring connection members being buried in a finishing grout with which the block-out spaces (S) are filled.

A method of constructing a precast structure manufactured using a contactless coupler of the present invention, includes (a) a step of allowing connecting rebars to be separated from each other and adjacent to each other by adjoining the precast structures in which the connecting rebars drawn from block-out spaces (S), respectively, are formed so that the block-out spaces (S) communicate with each other and (b) a step of disposing a plurality of contactless ring connection members to be spaced apart around the connecting rebars separated from each other and fill the block-out spaces (S) while surrounding the connecting rebars and installing the contactless ring connection members using a rib connector that includes both horizontal channel bodies in which a plurality of joint grooves are formed so that left and right side surfaces of the contactless ring connection members set around both connecting rebars are insertable and is installed through the block-out spaces (S) adjacent to and communicating with each other.

Advantageous Effects

According to the present invention, since, rather than connecting rebars exposed to the outside while directly contacting the connecting rebars to each other and connecting the connecting rebars to each other by a fastening force, a frictional force is effectively utilized by finishing grouting that fills block-out spaces around the connecting rebars and a rebar head capable of being formed in advance on the connecting rebars is used, it is possible to effectively secure workability and constructability for connection work of the connecting rebars.

In addition, as the rebar head can be integrated in advance with the connecting rebars or installed at a site, the rebar head can be installed to enable optimization to secure a frictional force and a fixation force, thereby maximizing the connection performance of a precast structure.

In addition, according to the present invention, by further installing contactless ring connection members and a rib connector around the connecting rebar, in addition to the rebar head, it is possible to provide reinforcement while restraining cured finishing grouting around the connecting rebar and simplify installation, so that it is possible to provide a contactless coupler that allows quick and economical precast structure connection, and a precast structure manufactured using the same.

DESCRIPTION OF DRAWINGS

FIG. 1A is an exemplary view of coupler construction of precast members in the related art.

FIG. 1B is an exemplary view of connection construction using an enlarged head of a concrete member in the related art.

FIG. 1C is an exemplary view of a fixing device for tendons that installs tendons in the concrete member in the related art and mounts the tension members to the concrete member.

FIG. 2A is an exemplary view of a contactless coupler of the present invention.

FIG. 2B is an exemplary view of a rib connector of the present invention.

FIGS. 3A and 3B are exemplary views of a rebar head of the present invention.

FIG. 4 is an exemplary view of a precast structure manufactured using a contactless coupler of the present invention.

FIGS. 5A, 5B, and 5C show exemplary views of manufacturing a precast structure manufactured using a contactless coupler of the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION

A contactless coupler including connecting rebars drawn from communicating block-out spaces (S) of precast structures adjacent to each other, respectively, and a plurality of contactless ring connection members disposed to be spaced apart around the connecting rebars that are adjacent and separated from each other and fill the block-out spaces (S) while surrounding the connecting rebars, in which the connecting rebars adjacent to each other are connected to each other without a coupler by a frictional force generated by the contactless ring connection members being buried in a finishing grout with which the block-out spaces (S) are filled, is considered as the best mode.

MODES OF THE INVENTION

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily perform the present invention. However, the present invention may be implemented in many different forms and is not limited to the embodiments described herein. In the drawings, in order to clarify the present invention, parts that are not related to description are omitted and like reference numerals represent like elements throughout the specification.

In the entire specification, when a part “includes” or “comprises” a component, unless described to the contrary, the term “includes” or “comprises” does not indicate that the part excludes another component but instead indicates that the part may further include the other component.

Contactless Coupler 100 of Present Invention

FIG. 2A is an exemplary view of a contactless coupler 100 of the present invention, FIG. 2B is an exemplary view of a rib connector 130 of the present invention, and FIGS. 3A and 3B are exemplary views of a rebar head 110 of the present invention.

Referring to FIGS. 2A and 2B, since the contactless coupler 100 structurally connects connecting rebars 200 of a precast structure 200 by installing a contactless ring connection member 120 and a rib connector 130 in block-out spaces S around the connecting rebars 210 without direct contact with the connecting rebars 210, the name, “contactless” is used in that there is no need for work to mechanically connect the connecting rebars 210 to each other using a coupler or the like,

Since when the connecting rebars 210 are connected in the contactless method, the connecting rebars 210 are not directly connected to each other, manufacturing and construction errors of the precast structure 200 may also be absorbed, thereby securing constructability and workability.

In this case, after transporting the precast structures 200 manufactured in advance at a factory, or the like, to a site, the present invention structurally connects the precast structures 200 to each other using the contactless coupler 100 and may be applied to various precast structures 200 such as culverts and tunnels.

To this end, as shown in FIGS. 2A and 2B, the contactless coupler 100 is used to connect the connecting rebars 210 of the precast structure 200 to each other in a contactless manner and includes a rebar head 110 and contactless ring connection members 120, a rib connector 130, and a finishing grout 140.

First, the precast structure 200 is a steel concrete member manufactured in advance using formwork at a factory, and tendons (not shown) may be further installed thereon to introduce prestress,

For example, the precast structure 200 may be considered a module member for construction by manufacturing various reinforced concrete structures such as culverts, underground and above-ground tunnels, and the like in a precast method and connecting the concrete structures to each other.

In this case, for manufacturing, transportation and construction, the precast structure 200 has no choice but to be manufactured to a certain size,

In order to connect the precast structures 200 to each other at the site, referring to FIG. 1A, the connecting rebars CR1 and CR2 drawn from the block-out spaces S are usually connected to each other using couplers 1 and 2, and the block-out spaces S are finished with grout so that the precast members PC1 and PC2 are connected to each other.

However, structural couplers are expensive, and when the central axes of the connecting rebars CR1 and CR2 adjacent to each other drawn from the block-out spaces S do not coincide, in some cases, fastening is not possible, so the precast members PC1 and PC2 are inevitably affected by construction and manufacturing errors.

In addition, torque to fasten the couplers 1 and 2 has to be consistently introduced, but in some cases, quality control becomes difficult due to site conditions.

Accordingly, as shown in FIG. 2A, the present invention does not use the couplers 1 and 2 in the related art, which have to directly fasten the connecting rebars 210 adjacent to each other, By installing the contactless ring connection members 120 disposed to be spaced apart to surround the connecting rebars 210 and allowing the contactless ring connection members 120 to also be buried by the finishing grout 140, the integration of the connecting rebars 210 is complemented by an anchoring force caused by a frictional force caused by the finishing grout 140.

In addition, the rib connector 130 is installed to facilitate setting while preventing the position of the contactless ring connection members 120 from being changed due to the finishing grout 140 with which the block-out spaces S are filled.

The rib connector 130 is installed through the block-out spaces S and also serves to secure connection performance at a connection joint surface of the precast structure 200.

In addition, the rebar head 110 is further formed on the connecting rebars 210, and the block-out spaces S are filled with the finishing grout 140 so that the rebar head 110 is buried, thereby using a method of connecting the connecting rebars 210 to each other by the anchoring force caused by the frictional force.

Accordingly, the rebar head 110 is formed in the form of an enlarged head formed to contact both connecting rebars 210 of the precast structure 200, as shown in FIG. 2A.

It can be seen that the rebar head 110 may be formed in the form of a cylindrical block with anchoring performance while contacting the connecting rebars 210, and a plurality of rebar heads 110 are formed on the respective connecting rebars 210 by being spaced apart from each other.

The rebar head 110 will be described with reference to FIGS. 3A and 3B as follows.

The rebar head 110 may be installed on the connecting rebar 210 by welding as shown in FIG. 3A or mechanically installed on the connecting rebar 210 as shown in FIG. 3B, thereby sufficiently securing workability and constructability.

In this case, welding-type in the welding-type rebar head 110 means that an enlarged node body 111 is fixed to the connecting rebar 210 by welding, and as shown in FIG. 3A, the rebar head 110 includes the enlarged node body 111, end fixing devices 112, and an enlarged node portion 113.

Accordingly, as shown in FIG. 3A, the enlarged node body 111 is formed to be, for example, divided (partitioned) into two parts and installed to surround and contact an outer peripheral surface of the connecting rebar 210, which allows workers to simply assemble and install the enlarged node body 111 on the outer peripheral surface of the connecting rebar 210 that extend and protrude from the precast structure 200, and the enlarged node body 111 includes an enlarged body portion 111a, an end fixing portion 111b, and an enlarged node connection portion 111c.

First, as shown in FIG. 3A, the enlarged body portion 111a may be divided into at least two parts to be installed to surround and contact the outer peripheral surface of the connecting rebar 210.

In this case, in a region where the enlarged body portion 111a and the connecting rebar 210 come into contact with each other, an inner groove 111d where the node and rib of the connecting rebar 210 are accommodated is formed on an inner surface thereof, so that workers may simply set the enlarged body portion 111a at any position and install a desired number of enlarged body portions 111a and the inner groove 111d is filled with melted metal by welding, thereby enabling secure fixed installation.

Next, as shown in FIG. 3A, the end fixing portion 111b is formed integrally in a ring shape at both side ends of the enlarged body portion 111a so that workability is securable and is brought into contact with the end fixing device 112, which will be described below, on an outer peripheral surface.

The end fixing device 112 is intended to maintain the divided enlarged body portion 111a in a temporarily joined form and may be removed after the enlarged body portion 111a is fixedly installed by welding.

That is, the welding-type rebar head 110 of the present invention may enable secure fixed installation in a method in which the inner groove 111d is filled with a metal (which may vary depending on a material of a welding rod or the like) melted by welding (arc welding, and so on) the enlarged body portion 111a to the connecting rebar 210 on a connecting surface of the divided enlarged body portion 111a.

In this case, in order to fill the inner groove 111d with the melted metal, a method of forming a welding hole through which the inner groove 111d is exposed in the enlarged node body 111, or a method of filling the inner groove 111d by welding using separation between both ends of the enlarged node body 111 and the connecting rebar 210, or the like, may be used.

Next, as shown in FIG. 3A, the enlarged node connection portion 111c is a fastener formed on the outer peripheral surface between the end fixing portions 111b on both sides of the enlarged body portion 111a and serves to ensure that the enlarged node portion 113 is detachably installed.

The enlarged node connection portion 111c has the concave portions and convex portions continuously formed as the fastener at the region in which the enlarged node connection portion is in contact with concrete so that a basic adhesive force is securable, but the enlarged node portion 113 to be described below is further installed on the enlarged node connection portion 111c to expand the attachment area so that the adhesive force is improved and the acupressure performance is also adjustable depending on a direction.

Next, as shown in FIG. 3A, the end fixing device 112 is for fixing and installing the enlarged body portion 111a to the connecting rebar 210 by welding in a state where the enlarged body portion 111a of the enlarged node body 111 is installed, and is formed, for example, in a ring shape having an inner surface corresponding to an outer peripheral surface of the end fixing portion 111b.

Accordingly, by setting the end fixing device 112 to be in contact with the end fixing portion 111b, the end fixing device 112 serves to maintain the divided enlarged body portion 111a in a joined state, and the enlarged body portion 111a is fixedly installed on the connecting rebar 210 by welding.

It is preferable to install two end fixing devices 112 at the ends on both sides of the enlarged node body 111, and although not shown, installation only at one end of the enlarged node body 111 is possible if there is no problem in securing the adhesive force.

In addition, the end fixing device 112 may be separated from the end fixing portion 111b after allowing the connecting rebar 210 to pass therethrough in advance, and then welding and fixedly installing the enlarged body portion 111a to the connecting rebar 210 by welding (arc welding or the like), and may be used by being formed in a ring shape using an insulating material (ceramic or the like).

Next, as shown in FIG. 3A, the enlarged node portion 113 allows the acupressure performance to be adjusted depending on direction while additionally securing the adhesive force with the finishing grout 140 of the rebar head 110 installed on the connecting rebar 210.

That is, the enlarged node connection portion 111c is formed as a screw fastening portion on the outer peripheral surface of the enlarged body portion 111a of the enlarged node body 111 as described above, and basically, the adhesive force with the finishing grout 140 may be secured by the concave portions and the convex portions, but

In order to secure an additional adhesive force by expanding the attachment area, an additional enlarged node portion 113 is detachably installed on the enlarged node connection portion 111c.

That is, the enlarged node portion 113 is installed in a ring shape in which a threaded portion is formed on an inner surface fastened to the enlarged node connection portion 111c to be detachable and the enlarged node body 111 is installed in a form perpendicular to the connecting rebar 210 so that the acupressure performance is securable.

Next, referring to FIG. 3B, the mechanical rebar head 110 is the same as the welding-type rebar head 110 in that the mechanical rebar head includes the enlarged node body 111, the end fixing device 112, and the enlarged node portion 113, and here, “mechanical” means that the enlarged node body 111 is fixed to the connecting rebar 210 by compression by rotational fastening of the end fixing device 112.

Accordingly, as shown in FIG. 3B, the enlarged node body 111 is also formed to be divided (partitioned) into two parts and installed to surround the outer peripheral surface of the connecting rebar 210, which allows workers to simply assemble and install the enlarged node body 111 on the outer peripheral surface of the connecting rebar 210 that extend and protrude from the precast structure 200, and is the same as the enlarged node body in the welding-type rebar head in that the enlarged node body 111 includes the enlarged body portion 111a, the end fixing portion 111b, and the enlarged node connection portion 111c.

Accordingly, as shown in FIG. 3B, the enlarged body portion 111a may also be divided into at least two parts and formed to surround the connecting rebar 210 to be installed to surround the outer peripheral surface of the connecting rebar 210, which is the same.

In this case, compared to the welding-type rebar head 110, since the region where the enlarged body portion 111a and the connecting rebar 210 come into contact with each other is formed to directly contact the node and rib of the connecting rebar 210, there is a difference in that the inner groove 111d is not formed unlike the welding-type rebar head,

Accordingly, it can be seen that the enlarged body portion 111a may be finally compressed by the end fixing device 112 by being made of a material capable of being compressed and being in direct contact with the rib and node of the connecting rebar 210, and thereby, workers may simply set the enlarged body portion 111a at any position and install a desired number of enlarged body portions, which is the same.

As shown in FIG. 3B, the end fixing portion 111b is formed integrally with both side ends of the enlarged body portion 111a, and a threaded portion is formed on an upper surface thereof so that the end fixing device 112 does not simply contact the end fixing portion,

In that the end fixing device 112 serves to integrate the enlarged body portion 111a with the connecting rebar 210 by compressing the end fixing portion 111b to the outer peripheral surface of the connecting rebar 210 while being integrated by screw-fastening to the threaded portion, the mechanical rebar head is different from the welding-type rebar head 110 that has seen before.

As shown in FIG. 3B, the enlarged node connection portion 111c is also a fastener formed on the outer peripheral surface between the end fixing portions 111b on both sides of the enlarged body portion 111a, and serves to ensure that the enlarged node portion 113 is detachably installed, which is the same,

in addition, the mechanical rebar head 110 of the present invention is different from the welding-type rebar head 110 that has been seen before in that in addition to the end fixing portion 111b, the enlarged node portion 113 also serves to mechanically additionally compress the enlarged body portion 111a to the connecting rebar 210 by the enlarged node connection portion 111c.

The enlarged node connection portion 111c has the concave portions and convex portions continuously formed as the fastener at the region in which the enlarged node connection portion is in contact with concrete so that a basic adhesive force is securable, but the enlarged node portion 113 is further installed on the enlarged node connection portion 111c to expand the attachment area so that the adhesive force is improved and the acupressure performance is also adjustable depending on a direction, which is the same.

Next, as shown in FIG. 3B, the end fixing device 112 is for fixing and installing the enlarged body portion 111a to the connecting rebar 210 in a state where the enlarged body portion 111a of the enlarged node body 111 is installed, and is formed in a ring shape having an inner surface corresponding to a bent portion of the end fixing portion 111b, which is the same.

However, the difference is that the end fixing device 112 is fastened to the fastener formed at the bent portion of the end fixing portion 111b by screwing-fastening and the enlarged node body 111 is fixedly installed on the connecting rebar 210 by compressing the end fixing device 112 to the connecting rebar 210 as the end fixing device 112 is rotated.

It is preferable to install two end fixing devices 112 at the ends on both sides of the enlarged node body 111, and although not shown, installation only at one end of the enlarged node body 111 is possible if there is no problem in securing the adhesive force, which is the same,

In addition, the end fixing device 112 may allow the connecting rebar 210 to pass therethrough in advance and then set the enlarged node body 111 and fixedly install the enlarged node body 111 on the connecting rebar 210 by compressing, and it is preferable not to separate and remove the enlarged node body 111 otherwise.

Next, as shown in FIG. 3B, the enlarged node portion 113 allows the acupressure performance to be adjusted depending on direction while additionally securing the adhesive force with concrete of the mechanical rebar head 110 installed on the connecting rebar 210, which is the same.

As expected, the enlarged node connection portion 111c is formed as a screw fastening portion on the outer peripheral surface of the enlarged body portion 111a of the enlarged node body 111 as described above, and basically, the adhesive force with the finishing grout 140 may be secured by the concave portions and the convex portions, but

In order to secure an additional adhesive force by expanding the attachment area, an additional enlarged node portion 113 is detachably installed on the enlarged node connection portion 111c.

That is, the enlarged node portion 113 is installed in a ring shape in which a threaded portion is formed on an inner surface fastened to the enlarged node connection portion 111c to be detachable and the enlarged node portion 113 is installed in a form perpendicular to the connecting rebar 210 so that the acupressure performance is securable.

Next, as shown in FIGS. 2A and 2B, the contactless ring connection members 120 are spaced apart around the connecting rebars 210, and are disposed to fill the block-out spaces S to surround the connecting rebars 210 so that the contactless ring connection members 120 are buried by the finishing grout 140, thereby

Complementing the integration of the connecting rebars 210 by the anchoring force caused by the frictional force caused by the finishing grout 140.

It can be seen that the contactless ring connection members 120 are formed in a circular ring shape. That is, the connecting rebars 210 adjacent to each other are separated from each other, but since a plurality of contactless ring connection members 120 may be disposed to be spaced apart around the connecting rebars 210 adjacent to each other, the contactless ring connection members 120 serve to structurally connect connecting rebars 210 adjacent to each other to each other using the frictional force with the finishing grout 140.

The contactless ring connection members 120 are shown in a circular ring shape but may be formed in various shapes as long as the contactless ring connection members 120 may be disposed in the block-out spaces S and may surround the connecting rebars 210.

When using a plurality of contactless ring connection members 120 in the circular ring shape in this way, there is an advantage of being able to increase a contact area with the finishing grout 140 and use a ready-made product as it is, and to this end, an outer peripheral surface of the circular ring may be coated with yarn so that numerous protrusions may be naturally formed.

Accordingly, in a state where the worker sets a plurality of contactless ring connection members around the connecting rebar 210 on one side to be spaced apart, when the connecting rebar 210 on the other side is set adjacent to each other, since all that is required is also to set a plurality of contactless ring connection members to be spaced apart from each other, the workability is also very excellent.

Next, as shown in FIGS. 2A and 2B, the rib connector 130 allows the plurality of contactless ring connection members 120 of the circular ring shape to be quickly installed at regular intervals in the block-out spaces S and to be buried in the finishing grout 140 after being installed through the block-out spaces S adjacent to and communicating with each other, thereby securing the connection performance at the connection joint surface D of the precast structure 200 by the frictional force.

Accordingly, according to FIGS. 2A and 2B, it can be seen that a horizontal channel bodies 131 in which a plurality of joint grooves 132 are formed so that left and right-side surfaces of the contactless ring connection members 120 of the circular ring shape set around both connecting rebars 210 are insertable may be used.

Accordingly, two horizontal channel bodies 131 may be spaced apart from each other in the form of horizontal plates so that both connecting rebars 210 and the plurality of contactless ring connection member 120 of the circular ring shape are set therebetween and be installed to cross the connection joint surface of the precast structure 200, thereby more effectively resisting the shear force acting on the connection joint surface of the precast structure.

The joint groove 132 allows both side surfaces of the contactless ring connection members 120 of the circular ring shape to be inserted and contacted between both horizontal channel bodies 131, thereby serving to fix the position of the contactless ring connection members 120 of the circular ring shape.

Accordingly, according to FIG. 2C, the joint groove is formed in a semicircular shape, inclined semicircular shape, L-shaped locking sphere shape, trapezoidal shape, or the like, so that the side surface of the contactless ring connection member 120 of the circular ring shape is inserted and caught.

Accordingly, it is desirable to install the contactless ring connection members 120 of the circular ring shape that is first joined to and integrated with the rib connectors 130 to surround the connecting rebars 210, it goes without saying that each of the rib connectors 130 that are space apart may be installed so that a plurality of rib connectors are connected in a longitudinal direction, and since the side joint of the contactless ring connection member 120 of the circular ring shape is not necessarily performed only when two contactless ring connection members are installed to be spaced apart from each other,

There is no limit to the number of installations, such as two on one side and correspondingly two on the other side.

Next, as shown in FIGS. 2A and 2B, the finishing grout 140 finishes the work by burying the rebar head 110, the contactless ring connection members 120, and the rib connectors 130 formed in the block-out spaces S formed in communication with each other in the connection joint surface D of the precast structure 200, thereby serving to integrate them with each other.

Accordingly, it does not matter when non-shrink mortar, concrete, or the like, is used, and the finishing grout 140 serves to enable fixation performance and integration of the precast structure 200 by a frictional force with the rebar head 110, the contactless ring connection members 120, and the rib connectors 130.

Precast Structure 200 Manufactured Using Contactless Coupler 100 of the Present Invention

FIG. 4 shows an exemplary view of a precast structure 200 manufactured using a contactless coupler 100 of the present invention.

As the precast structure 200, FIG. 4 illustrates an L-shaped retaining wall.

It can be seen that the L-shaped retaining wall is formed to include a bottom plate 230 and a wall 240, and it can be seen that in the L-shaped retaining wall, a plurality of block-out spaces S for continuously connecting the bottom plate 230 and the wall 240 horizontally are formed spaced apart in a longitudinal direction (L-shaped retaining wall connection direction).

Accordingly, connecting rebars 210 to be connected to each other are exposed in the block-out spaces S of the bottom plate 230 and the wall 240,

A rebar head 110 is installed on the connecting rebars 210 separately at the site, and since when the rebar head 110 is used, an exposed extension length of the connecting rebar 210 may be minimized, more effective connection work of the connecting rebars 210 is possible.

After each rebar head 110 is installed on the connecting rebar 210 in this way, the contactless ring connection members 120 are installed all at once using the rib connectors 130.

Of course, there is no problem with separately installing contactless ring connection members, but depending on site conditions, installing the contactless ring connection members all at once allows for quick work.

It can be seen that the contactless ring connection members 120 is set by the rib connectors 130 passing through the connection joint surface D.

Accordingly, the finishing grout 140 is poured and cured in the block-out spaces S so that the contactless ring connection members 120 and the connecting rebars 210 on which the rib connectors 130 are installed are buried, thereby allowing final precast structures A to be structurally connected to each other.

Method of Constructing Precast Structure 200 Using Contactless Coupler 100 of the Present Invention

FIGS. 5A, 5B, and 5C show a flowchart of constructing a precast structure 200 manufactured using a contactless coupler 100 of the present invention.

Accordingly, according to FIG. 5A, it can be seen that precast structures 200 in which rebar heads 110 of contactless couplers 100 are installed on connecting rebars 210 may be manufactured in advance at a factory or the like, brought into a site, and joined to each other so that connection joint surfaces D thereof are joined to each other.

The precast structures 200 may be manufactured by connecting a plurality of reinforced concrete members to each other and integrating the reinforced concrete members and may ultimately become a culvert or the like, and in the precast structures 200, box-shaped block-out spaces S are formed in advance so that the connecting rebars 210 may be structurally connected and integrated.

Accordingly, according to FIG. 5A, as the block-out spaces S of the adjacent precast structures 200 communicate with each other, the connecting rebars 210 are installed to be connected to each other on the same axis using a coupler in the related art, but problems occur when the connecting rebars do not match each other due to construction or manufacturing errors,

In the present invention, without using the coupler, the connecting rebars 210 may be installed to be connected to each other by installing the rebar head 110, contactless ring connection members 120, and rib connectors 130 in a contactless manner, and filling a space where they are installed with a finishing grout 140.

In this case, referring to FIG. 5A, it can be seen that the connecting rebars 210 are drawn in the block-out spaces S of both precast structures 200, and it can be seen that the rebar head 110 is formed integrally with an outer peripheral surface of the connecting rebar 210.

As shown in FIGS. 3A and 3B, as the rebar head 110, a welding-type or mechanical rebar head 110 may be used and may be formed to include an enlarged node body 111, an end fixing device 112, and an enlarged node portion 113.

Next, according to FIG. 5B, the contactless ring connection members 120 are disposed to be spaced apart to surround the connecting rebars 210 using rib connectors 130 around the connecting rebars 210 adjacent to each other.

Since the contactless ring connection members 120 are formed in a circular ring shape, the contactless ring connection members may be installed by being inserted into the connecting rebar 210, thereby providing excellent workability and allowing initial setting of a plurality of contactless ring connection members 120 so as to be spaced apart from each other.

The contactless ring connection members 120 may be distributed throughout the communicating block-out spaces S and buried by the finishing grout 140, so that the integration of the connecting rebars 210 may be complemented by the anchoring force caused by the frictional force caused by the finishing grout 140.

In this case, as seen above, two horizontal channel bodies 131 of the rib connector 130 may be spaced apart in the form of a horizontal plate to allow the both connecting rebars 210 and a plurality of contactless ring connection members 120 in the circular ring shape to be set between the horizontal channel bodies and be installed to cross the connection joint surface of the precast structure 200, thereby more effectively resisting the shear force acting on the connection joint surface of the precast structure, and the joint grooves 132 serve to fix the position of the contactless ring connection member 120 by allowing both side surfaces of the contactless ring connection members 120 in the circular ring shape to be inserted and in contact with each other between the both horizontal channel bodies 131.

Next, as shown in FIG. 5C, final finishing is performed by filling the block-out spaces S with the finishing grout 140 so that the connecting rebars 210 connected to each other by the rib connector 130 and the contactless ring connection members 120 are buried.

The block-out spaces S may be filled with the finishing grout 140 using non-shrinking mortar, concrete, or the like so that the rebar head 110, the contactless ring connection members 120, and the rib connector 130 formed in the block-out space S formed by communicating with each other on the connection joint surface D of the precast structure 200 are buried, and when the finishing grout is finally cured, the integration of anchorage performance and the precast structure 200 is possible by the frictional force with the rebar head 110, the contactless ring connection members 120, and the rib connector 130.

The above description of the present invention is for illustration, and those of ordinary skill in the art to which the present invention pertains could understand that it may be easily modified into other specific forms without changing the technical spirit or essential features of the present invention. Therefore, it should be appreciated that the embodiments described above are intended to be illustrative in all respects and not restrictive. For example, each component described as a single type may be implemented in a distributed manner, and similarly, components described to be distributed may also be implemented in a combined form.

The scope of the present invention is represented by the claims to be described below rather than the above detailed description, and it is to be interpreted that the meaning and scope of the claims and all changes or modifications derived from the equivalents thereof fall within the scope of the present invention.