PRECAST CONCRETE REINFORCING BLOCK ASSEMBLY FOR SEISMIC STRENGTHENING AND METHOD FOR CONSTRUCTING SAME

Description

TECHNICAL FIELD

The present invention relates to a precast concrete reinforcing block assembly for seismic strengthening and a method for constructing the same that are capable of allowing internal reinforcing bars to be inserted into hollow holes of a plurality of precast concrete reinforcing block units stacked outside or inside an existing structural member and filling the hollow holes with filling materials, thereby providing excellent constructability, having no additional fire protection coating, and allowing reinforcement of internal force against an axial force of the member.

BACKGROUND ART

As the frequency and magnitude of earthquakes have recently increased even in Korea, people are increasingly suffering from damage to lives and buildings. In specific, buildings constructed before 1988, that is, before a seismic design for buildings with six or more stories is introduced, have been still used, and further, buildings constructed before 2017, that is, before objects to which the seismic design is applied are increased to small-scale buildings with two or more stories, are great in number. As a result, there are many demands for the seismic strengthening reinforcement of such buildings.

To perform the seismic strengthening reinforcement for an existing reinforced concrete member, in conventional practices, there are a section enlargement method where reinforced bars are arranged around the existing member and concrete is cast to increase a section and a steel plate reinforcing method where steel plates are surroundedly attached to the existing member.

However, the section enlargement method requires temporary processes for building and removing a form on a site and the time for casting and curing the concrete for section enlargement, thereby undesirably causing low workability and increasing a period of construction.

Further, the steel plate reinforcing method requires welding on a site to cause the risk of fire due to hot work and has an additional fire protection coating process for the steel plates.

To solve such problems, there is suggested a conventional technology in which a reinforcing panel made by bending a high strength steel plate and filling a filling material such as epoxy mortar or polymer mortar inside the bent steel plate is fixed to an existing member by means of anchor bolts (which is disclosed in Korean Patent No. 10-1672924).

According to the above-mentioned conventional technology, however, the high strength steel plate has to be bent, which unavoidably increases a manufacturing cost, and further, the steel plate is exposed to the outside, thereby requiring an additional coating work for applying fire protection paint to the outer surface of the steel plate. Furthermore, the maintenance of the steel plate has to be consistently needed to prevent the steel plate from corroding and external finishing work has to be additionally done, thereby causing many inconveniences of use.

In addition, fastening of reinforcing bands have to be performed to allow individual reinforcing panels to be coupled integrally with one another, and in this case, the reinforcing bands protrude outward from the reinforcing panels, thereby causing poor usability and bad outer appearances. To avoid the use of such reinforcing bands, the reinforcing panels should be fixed to one another by means of welding on a site, thereby making it hard to ensure uniform welding qualities, being influenced by site situations such as weather and the like, and having the risk of fire due to hot work.

To solve the problems the conventional steel plate reinforcing method have had, another technology is disclosed in Korean Patent No. 10-2306103.

According to the conventional technology, a plurality of precast concrete reinforcing panel units are built on an existing concrete member that does not have enough internal force and then connected to one another by means of connectors. In this case, they are easy and economical in production, and their site constructability and fire protection performance are excellent. Since the plurality of precast concrete reinforcing panel units are continuously built, further, they can be small in size and lightweight, thereby being advantageous in their treatment and construction, and the reinforcing members are provided to the form of units, thereby being easily applied to existing members having various sizes.

According to the conventional technology, however, the precast concrete reinforcing panel units are coupled to the existing concrete member by means of the connectors inserted into key grooves. Therefore, they are mainly resistant to the lateral force, that is, to the shear force of the existing member, but they have the limitations in increasing the internal force against the axial stress of the existing member.

DISCLOSURE

Technical Problem

Accordingly, the present invention has been made in view of the above-mentioned problems occurring in the related art, and it is an object of the present invention to provide a precast concrete reinforcing block assembly for seismic strengthening and a method for constructing the same that are capable of providing excellent constructability, having no additional fire protection coating, and allowing reinforcement of internal force against an axial force of a member.

Technical Solution

To accomplish the above-mentioned object, according to one aspect of the present invention, there is provided a precast concrete reinforcing block assembly for seismic strengthening, which is adapted to reinforce an existing reinforced concrete member, the precast concrete reinforcing block assembly including: a plurality of precast concrete reinforcing block units each having a cuboidal body, an upper extension portion protruding from the upper portion of the body in one direction, and a lower extension portion protruding from the lower portion of the body in the other direction, so that the plurality of precast concrete reinforcing block units are interlockingly stacked on top of each other in every direction by means of hollow holes formed therein to pass therethrough in longitudinal directions thereof; internal reinforcing bars adapted to pass through the hollow holes of the plurality of precast concrete reinforcing block units stacked up and down on top of each other; and filling materials filled in the hollow holes of the plurality of precast concrete reinforcing block units.

According to the present invention, desirably, the precast concrete reinforcing block unit may have first receiving grooves formed on at least one or more outer surfaces thereof in the longitudinal direction thereof, so that first external reinforcing bars are received in the first receiving grooves in such a way as to be located over the plurality of precast concrete reinforcing block units stacked on top of each other in the longitudinal directions of the plurality of precast concrete reinforcing block units, and the filling materials may be filled in the first receiving grooves.

According to the present invention, desirably, the precast concrete reinforcing block unit may have second receiving grooves formed on at least one or more surfaces of the front and rear surfaces thereof in a transverse direction thereof, so that second external reinforcing bars are received in the second receiving grooves in such a way as to be located over the plurality of precast concrete reinforcing block units adjacent to one another in the transverse directions of the plurality of precast concrete reinforcing block units, and the filling materials may be filled in the second receiving grooves.

According to the present invention, desirably, the hollow holes may pass through the body, the upper extension portion, and the lower extension portion, respectively, in vertical directions.

To accomplish the above-mentioned object, according to another aspect of the present invention, there is provided a method for constructing a precast concrete reinforcing block assembly for seismic strengthening, the method including the steps of: (a) stacking a plurality of precast concrete reinforcing block units on the outer surfaces of an existing member; (b) insertedly building internal reinforcing bars into hollow holes formed on the plurality of precast concrete reinforcing block units stacked up and down on top of each other; and (c) filling the hollow holes with filling materials.

Advantageous Effects

According to the present invention, the precast concrete reinforcing block assembly for seismic strengthening has the following advantages.

Firstly, the precast concrete reinforcing block assembly is configured to allow the precast concrete reinforcing block units pre-made at a plant to be stacked up and down on the outer surfaces of the existing member, while the hollow portions formed on the precast concrete reinforcing block units are communicating with one another. As a result, the precast concrete reinforcing block assembly ensures excellent fire prevention performance by means of the use of the precast concrete reinforcing block units as non-combustible materials, thereby causing no additional fire prevention coating.

Secondly, the precast concrete reinforcing block assembly is configured to allow the filling materials to be filled in the hollow holes into which the internal reinforcing bars are inserted so that the internal reinforcing bars and the precast concrete reinforcing block units are integral with one another, thereby achieving simple construction. Further, the precast concrete reinforcing block assembly is configured to allow the plurality of precast concrete reinforcing block units to be continuously arranged in the longitudinal direction thereof, so that they are resistant to a compressive force, a shear force, and a bending moment, thereby increasing the internal force against the axial and lateral forces of the member to have excellent seismic strengthening.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a perspective view showing a precast concrete reinforcing block unit according to the present invention.

FIG. 2 is a perspective view showing a precast concrete reinforcing block assembly according to the present invention that is built on the outer surfaces of an existing column member.

FIGS. 3 and 4 are sectional views showing the precast concrete reinforcing block unit coupled to one side of the existing column member.

FIGS. 5 to 8 are sectional views showing coupled states of precast concrete reinforcing block units with various sectional shapes and hollow holes according to the present invention.

FIG. 9 is a perspective view showing the precast concrete reinforcing block assembly disposed spaced apart from the existing column member.

FIG. 10 is a sectional view showing L-shaped precast concrete reinforcing block units coupled to an existing girder member according to the present invention.

FIG. 11 is a sectional view showing a state where first external reinforcing bars are inserted into first receiving grooves according to the present invention.

FIG. 12 is a perspective view showing another example of the precast concrete reinforcing block unit according to the present invention.

FIG. 13 is a perspective view showing the precast concrete reinforcing block assembly as a bearing wall according to the present invention.

FIG. 14 is a perspective view showing a Z-shaped precast concrete reinforcing block unit according to the present invention.

FIG. 15 is a perspective view showing a precast concrete reinforcing block assembly the precast concrete using reinforcing block units of FIG. 14.

FIG. 16 is a sectional view showing a state where internal reinforcing bars are mounted on the precast concrete reinforcing block assembly of FIG. 15.

FIG. 17 is a perspective view showing a precast concrete reinforcing block unit that is convex on top and concave on bottom according to the present invention.

FIG. 18 is a perspective view showing a precast concrete reinforcing block assembly using the precast concrete reinforcing block units of FIG. 17.

FIG. 19 is a perspective view showing another example of the precast concrete reinforcing block unit that is convex on top and concave on bottom according to the present invention.

FIG. 20 is a perspective view showing a precast concrete reinforcing block assembly using the precast concrete reinforcing block units of FIG. 19.

FIG. 21 is a perspective view showing a precast concrete reinforcing block unit for a shear wall according to the present invention.

FIG. 22 is a perspective view showing a precast concrete reinforcing block assembly using the precast concrete reinforcing block units of FIG. 21.

BEST MODE FOR INVENTION

To accomplish the above-mentioned object, there is provided a precast concrete reinforcing block assembly for seismic strengthening according to the present invention, which is adapted to reinforce an existing reinforced concrete member, the precast concrete reinforcing block assembly including: a plurality of precast concrete reinforcing block units each having a cuboidal body, an upper extension portion protruding from the upper portion of the body in one direction, and a lower extension portion protruding from the lower portion of the body in the other direction, so that the plurality of precast concrete reinforcing block units are interlockingly stacked on top of each other in every direction by means of hollow holes formed therein to pass therethrough in longitudinal directions thereof; internal reinforcing bars adapted to pass through the hollow holes of the plurality of precast concrete reinforcing block units stacked up and down on top of each other; and filling materials filled in the hollow holes of the plurality of precast concrete reinforcing block units.

MODE FOR INVENTION

Hereinafter, an explanation of the present invention will be given in detail with reference to the attached drawings.

FIG. 1 is a perspective view showing a precast concrete reinforcing block unit according to the present invention, FIG. 2 is a perspective view showing a precast concrete reinforcing block assembly according to the present invention that is built on the outer surfaces of an existing column member, FIGS. 3 and 4 are sectional views showing a precast concrete reinforcing block unit coupled to one side of the existing column member assembly, FIGS. 5 to 8 are sectional views showing coupled states of precast concrete reinforcing block units with various sectional shapes and hollow holes according to the present invention, and FIG. 9 is a perspective view showing the precast concrete reinforcing block assembly disposed spaced apart from the existing column member.

As shown in FIGS. 1 to 9, a precast concrete reinforcing block assembly for seismic strengthening according to the present invention is adapted to reinforce an existing reinforced concrete member 1a, 1b, or 1c and includes: a plurality of precast concrete reinforcing block units 2 stacked up and down on top of each other and each having hollow holes 20 formed therein in a longitudinal direction thereof; internal reinforcing bars 3 adapted to pass through the hollow holes 20 of the plurality of precast concrete reinforcing block units 2 stacked up and down on top of each other; and filling materials 4 filled in the hollow holes 20 of the plurality of precast concrete reinforcing block units 2.

The present invention relates to a precast concrete reinforcing block assembly for seismic strengthening and a method for constructing the same that are capable of providing excellent constructability, having no additional fire protection coating, and allowing reinforcement of internal force against an axial force of a member.

The precast concrete reinforcing block assembly for seismic strengthening according to the present invention is attached to one side of an existing reinforcing concrete member whose seismic strengthening reinforcement is needed or surroundedly attached to the entire outer surface of the member.

The precast concrete reinforcing block assembly for seismic strengthening according to the present invention includes the plurality of precast concrete reinforcing block units 2, the internal reinforcing bars 3, and the filling materials 4.

Each precast concrete reinforcing block unit 2 is a precast concrete block pre-made at a plant and has reinforced bars or steel nets arranged therein. Otherwise, the precast concrete reinforcing block unit 2 may be made of high strength precast concrete or UHPC having excellent strength and ductility.

The precast concrete block as a non-combustible material has excellent fire resistant performance and no risk of corrosion, thereby causing no additional fire resistance and corrosion prevention treatments. Further, the precast concrete block is made at a plant so that the quality of the precast concrete block finished is good, thereby requiring no additional finishing treatment therefor.

The precast concrete reinforcing block unit 2 has the hollow holes 20 formed therein in such a way as to pass therethrough in the longitudinal direction thereof, so that the plurality of precast concrete reinforcing block units 2 are stackable up and down on top of each other.

The plurality of precast concrete reinforcing block units 2 constituting the precast concrete reinforcing block assembly according to the present invention are provided in a longitudinal transverse direction of the existing member 1a, 1b, or 1c in such a way as to come into close contact with or be spaced apart from the existing member 1a, 1b, or 1c.

The formation of the hollow holes 20 allows the self-weight of the plurality of precast concrete reinforcing block units 2 to be reduced, thereby lowering the lifting loads of the precast concrete reinforcing block units 2.

The hollow holes 20 has various sectional shapes such as circles, ovals, polygons, and the like. Further, one or more hollow holes 20 are formed according to the sizes and shapes of the precast concrete reinforcing block units 2.

FIGS. 3 and 4 are sectional views showing the precast concrete reinforcing block unit 2 coupled to one side of the existing column member 1a, and as shown in FIGS. 3 and 4, an embodiment wherein one oval hole 20 is formed is suggested, whereas another embodiment wherein two circular holes 20 are formed is suggested.

The plurality of precast concrete reinforcing block units 2 are stacked up and down on top of each other in such a way as to allow the hollow holes 20 formed therein to communicate with one another.

The internal reinforcing bars 3 pass through the hollow holes 20 of the plurality of precast concrete reinforcing block units 2 stacked up and down on top of each other.

That is, the internal reinforcing bars 3 are inserted into the hollow holes 20 that are formed on the plurality of precast concrete reinforcing block units 2 stacked up and down on top of each other in such a way as to communicate with one another.

The internal reinforcing bars 3 each have a length corresponding to the entire height of the precast concrete reinforcing block assembly made by stacking the plurality of precast concrete reinforcing block units 2 on top of each other.

The internal reinforcing bars 3 are bar-shaped members such as reinforced bars, steel bars, and the like that are capable of transferring an axial force (compression or tension) applied to the assembly.

The filling materials 4 are filled into the hollow holes 20 of the plurality of precast concrete reinforcing block units 2.

The filling materials 4 are filled in the hollow holes 20 into which the internal reinforcing bars 3 are inserted so that the internal reinforcing bars 3 are integral with the plurality of precast concrete reinforcing block units 2. Further, the filling materials 4 allow the plurality of precast concrete reinforcing block units 2 separated from one another to be continuously coupled to one another in their longitudinal direction, so that the plurality of precast concrete reinforcing block units 2 are resistant to a compressive force, a shear force, and a bending moments.

Therefore, the filling materials 4 increase the internal force against the axial and lateral forces of the member, thereby allowing the precast concrete reinforcing block assembly to have excellent seismic strengthening.

The filling materials 4 are non-shrinkable mortar.

If the existing member is a column 1a, the precast concrete reinforcing block assembly is built on each surface of the existing column 1a (See FIG. 2), and otherwise, the precast concrete reinforcing block assembly is built only on the front surface of the existing column 1a (See FIGS. 3 to 8).

If the precast concrete reinforcing block assembly is built only on the front surface of the existing column 1a, the rear surface of the precast concrete reinforcing block assembly has the same width as the front surface of the existing column 1a, while the front surface thereof has a larger width than the front surface of the existing column 1, so that a sufficient sectional area of the precast concrete reinforcing block assembly is ensured.

FIGS. 5 and 6 show an embodiment wherein the sectional area of the front side of the precast concrete reinforcing block assembly becomes gradually enlarged. Further, FIGS. 7 and 8 show an embodiment wherein the sectional area of the front side of the precast concrete reinforcing block assembly becomes gradually enlarged to a shape of T.

If the existing member is a girder 1b, the precast concrete reinforcing block units 2 are built on three sides of the existing girder 1b, that is, on both sides and underside of the existing girder 1b (See FIG. 10).

If the existing member is a wall, further, the precast concrete reinforcing block assembly is built on the front surface of the existing wall.

If it is desired that the sectional area of the exiting member 1a, 1b, or 1c is increased and thus reinforced, the precast concrete reinforcing block assembly is built spaced apart from the exiting member 1a, 1b, or 1c. Next, concrete C or non-shrinkable mortar is cast in a space portion between the precast concrete reinforcing block assembly and the exiting member 1a, 1b, or 1c (See FIG. 9). In this case, the precast concrete reinforcing block assembly serves as both of a form and a member reinforcer.

FIG. 10 is a sectional view showing L-shaped precast concrete reinforcing block units coupled to an existing girder member according to the present invention.

As shown in FIGS. 1, 3 and 10, the precast concrete reinforcing block units 2 each have an anchor hole 21 formed to pass therethrough in a horizontal direction thereof so that they are fixed to one side of the existing member 1a, 1b, or 1c by means of anchor members 5 passing through the anchor holes 21.

The precast concrete reinforcing block units 2 are fixed to the existing member 1a, 1b, or 1c by means of at least one or more anchor members 5 post-constructed.

To do this, the precast concrete reinforcing block units 2 each have at least one or more anchor holes 21. Further, the existing member 1a, 1b, or 1c has anchor fixing holes (not shown) drilled on a site on positions corresponding to the anchor holes 21.

Each precast concrete reinforcing block unit 2 has an anchor receiving groove 22 formed on the outside of the anchor hole 21 in such a way as to receive a protruding end portion of the anchor member 5 and a fixing nut 51 for fixing the anchor member 5.

After the anchor member 5 is completely fixed, non-shrinkable mortar or epoxy is filled in the anchor receiving groove 22.

As shown in FIG. 3, the precast concrete reinforcing block unit 2 has the shape of a straight section, so that it is attached to each surface of the existing member 1a, 1b, or 1c.

Otherwise, as shown in FIG. 10, the precast concrete reinforcing block unit 2 has the L-shaped section so that it is bent on a corner to surround the corner of the existing member 1a, 1b, or 1c. In this case, the respective corners of the existing member 1a, 1b, or 1c are effectively restrained by the precast concrete reinforcing block units 2, so that the strength and ductility of the existing member 1a, 1b, or 1c located inside the precast concrete reinforcing block units 2 become increased when compressive forces are applied.

FIG. 11 is a sectional view showing a state where first external reinforcing bars are inserted into first receiving grooves according to the present invention.

As shown in FIG. 11, the precast concrete reinforcing block unit 2 has first receiving grooves 23 formed on at least one or more outer surfaces thereof in a longitudinal direction thereof, and therefore, first external reinforcing bars 6 are received in the first receiving grooves 23 in such a way as to be located over the plurality of precast concrete reinforcing block units 2 stacked on top of each other in the longitudinal directions of the plurality of precast concrete reinforcing block units 2. After that, the filling materials 4 are filled in the first receiving grooves 23.

The internal reinforcing bars 3 are located in the hollow holes 20 formed inside the precast concrete reinforcing block unit 2, so that they are positioned close to a neutral axis, thereby having the limitations in bending stiffness.

Therefore, the first external reinforcing bars 6 are continuously built over the outer surface of the precast concrete reinforcing block assembly in the longitudinal direction of the precast concrete reinforcing block assembly.

To do this, the first receiving grooves 23 are formed on the front surface of the precast concrete reinforcing block unit 2 in the longitudinal direction of the precast concrete reinforcing block unit 2, that is, in the longitudinal direction of the existing member 1a, 1b, or 1c, and in this case, the first receiving grooves 23 communicate with the first receiving grooves 23 formed on the neighboring precast concrete reinforcing block units 2 in the longitudinal directions of the precast concrete reinforcing block units 2.

The first external reinforcing bars 6 are received in the first receiving grooves 23 continuously formed in the longitudinal direction of the member in such a way as to be located over the plurality of precast concrete reinforcing block units 2 in the longitudinal direction of the member.

The first external reinforcing bars 6 are bar-shaped members such as reinforced bars, steel bars, and the like that are capable of transferring an axial force.

The filling materials 4 filled in the first receiving grooves 23 are epoxy putty, non-shrinkable mortar, or the like.

Epoxy putty is epoxy resin-based putty having strong strength of epoxy resin. Such epoxy putty serves to reinforce the adhesion with the first receiving grooves 23 so that it effectively transfers stress between the first external reinforcing bars 6 and the precast concrete reinforcing block unit 2.

FIG. 12 is a perspective view showing another example of the precast concrete reinforcing block unit according to the present invention, and FIG. 13 is a perspective view showing the precast concrete reinforcing block assembly as a bearing wall according to the present invention.

As shown in FIG. 13, the precast concrete reinforcing block assembly is configured to stack the plurality of precast concrete reinforcing block units 2 on top of each other in every direction, thereby being provided as a bearing wall.

The precast concrete reinforcing block assembly is built as a filling wall between the existing columns 1a, thereby reinforcing the existing structure.

To do this, the plurality of precast concrete reinforcing block units 2 stacked up and down on top of each other are continuously connected to one another in transverse directions thereof, thereby being provided as the bearing wall.

As a result, the plurality of precast concrete reinforcing block units 2 as the bearing wall serve to reinforce an existing Rahmen frame constituted of columns and beams.

As shown in FIGS. 12 and 13, the precast concrete reinforcing block unit 2 has second receiving grooves 24 formed on at least one or more surfaces of the front and rear surfaces thereof in a transverse direction thereof, and therefore, second external reinforcing bars 7 are received in the second receiving grooves 24 in such a way as to be located over the plurality of precast concrete reinforcing block units 2 adjacent to one another in the transverse directions of the plurality of precast concrete reinforcing block units 2. After that, the filling materials 4 are filled in the second receiving grooves 24.

If the precast concrete reinforcing block assembly is configured as the bearing wall, the plurality of precast concrete reinforcing block units 2 arranged in a plurality of columns have to be integrally connected to one another in the transverse direction of the precast concrete reinforcing block assembly.

If the precast concrete reinforcing block assembly as the bearing wall is constructed as the form of the filling wall between a pair of columns, however, it is hard to build reinforcing bars passing through the precast concrete reinforcing block units 2 adjacent to one another in their transverse direction due to the interference of the left and right columns.

The second receiving grooves 24 are formed on the front and/or rear surfaces of the precast concrete reinforcing block unit 2 in the horizontal (transverse) direction of the precast concrete reinforcing block unit 2 in such a way as to communicate with the second receiving grooves 24 formed on the neighboring precast concrete reinforcing block units 2, and next, the second external reinforcing bars 7 are received in the second receiving grooves 24. After that, the filling materials 4 are filled in the second receiving grooves 24. As a result, the precast concrete reinforcing block units 2 adjacent to one another in their transverse direction are connected integrally with one another.

The second external reinforcing bars 7 are post-constructed on the outside of the precast concrete reinforcing block assembly after the precast concrete reinforcing block units 2 have been built, so that they can be constructed, without having any interference of external members such as columns, and the like.

If both of the first receiving grooves 23 and the second receiving grooves 23 are formed on the outer surfaces of the precast concrete reinforcing block units 2, they are different in depth, thereby preventing the first external reinforcing bars 6 and the second external reinforcing bars 7 inserted thereinto from interfering with each other.

FIG. 14 is a perspective view showing a Z-shaped precast concrete reinforcing block unit according to the present invention, and FIG. 15 is a perspective view showing a precast concrete reinforcing block assembly using the precast concrete reinforcing block units of FIG. 14.

As shown in FIGS. 14 and 15, a precast concrete reinforcing block unit 2 includes a cuboidal body 2a, an upper extension portion 2b protruding from the upper portion of the body 2a in one direction, and a lower extension portion 2c protruding from the lower portion of the body 2a in the other direction, and such a plurality of precast concrete reinforcing block units 2 are interlockingly connected to one another in every direction.

To allow the precast concrete reinforcing block units 2 that are stacked in every direction to constitute the precast concrete reinforcing block assembly to be more firmly connected to the neighboring precast concrete reinforcing block units 2, the precast concrete reinforcing block units 2 are bent and thus interlock with one another.

In detail, the precast concrete reinforcing block unit 2 includes the cuboidal body 2a and the upper extension portion 2b and the lower extension portion 2c protruding from the upper portion and the lower portion of the body 2a in the opposite directions to each other, so that the lower portion of one side of the precast concrete reinforcing block unit 2 and the upper portion of the other side thereof are stepped, thereby providing the precast concrete reinforcing block unit 2 having the shape of Z.

The stepped portions of the precast concrete reinforcing block unit 2 interlocks with those of the neighboring precast concrete reinforcing block units 2, so that the precast concrete reinforcing block unit 2 is firmly coupled to the neighboring precast concrete reinforcing block units 2 in every direction.

Of course, the Z-shaped precast concrete reinforcing block unit 2 has the first receiving grooves 23 and/or the second receiving grooves 24 on the front and/or rear surfaces thereof, the first external reinforcing bars 6 and/or the second external reinforcing bars 7 inserted into the respective receiving grooves 23 and 24, and the filling materials 4 filled in the respective receiving grooves 23 and 24.

FIG. 16 is a sectional view showing a state where the internal reinforcing bars are mounted on the precast concrete reinforcing block assembly of FIG. 15.

As shown in FIG. 16, the hollow holes 20 pass through the body 2a, the upper extension portion 2b, and the lower extension portion 2c, respectively, in vertical directions.

If the precast concrete reinforcing block units 2 are Z-shaped in such a way as to allow the stepped portions thereof to interlock with those of the neighboring precast concrete reinforcing block units 2, the hollow holes 20 are formed to pass through the body 2a, the upper extension portion 2b, and the lower extension portion 2c of each precast concrete reinforcing block unit 2, and the internal reinforcing bars 3 are built to pass through the hollow holes 20, so that the precast concrete reinforcing block unit 2 is firmly coupled to the neighboring precast concrete reinforcing block units 2 in every direction.

As a result, the precast concrete reinforcing block unit 2 is connected to the five precast concrete reinforcing block units 2 arranged therearound. That is, the neighboring six precast concrete reinforcing block units 2 are connected to one another as a firm integral body.

FIG. 17 is a perspective view showing a precast concrete reinforcing block unit that is convex on top and concave on bottom according to the present invention, and FIG. 18 is a perspective view showing a precast concrete reinforcing block assembly using the precast concrete reinforcing block units of FIG. 17. Further, FIG. 19 is a perspective view showing another example of the precast concrete reinforcing block unit that is convex on top and concave on bottom according to the present invention, and FIG. 20 is a perspective view showing a precast concrete reinforcing block assembly using the precast concrete reinforcing block units of FIG. 19.

As shown in FIGS. 17 to 20, the precast concrete reinforcing block unit 2 according to the present invention is convex on top thereof and is concave on bottom to the corresponding shape to top thereof, so that top of a lower side precast concrete reinforcing block unit 2 insertedly interlocks with bottom of an upper side precast concrete reinforcing block unit 2.

To allow the precast concrete reinforcing block units 2 stacked up and down to be firmly connected to one another in such a way as to be resistant to the lateral force through the shear force of the precast concrete reinforcing block units 2 on the connected portions thereof, tops of the precast concrete reinforcing block units 2 are convex, and bottoms of the precast concrete reinforcing block units 2 are concave.

In this case, tops and bottoms of the precast concrete reinforcing block units 2 have the corresponding shapes to each other. If the precast concrete reinforcing block units 2 are stacked, further, the lower side precast concrete reinforcing block unit 2 is inserted into the bottom of the upper side precast concrete reinforcing block unit 2 and is thus firmly connected thereto.

To do this, as shown in FIGS. 17 and 18, each precast concrete reinforcing block unit 2 has a protrusion 25 protruding from the center of top thereof and a groove 26 formed on the bottom thereof to the corresponding shape to the protrusion 25.

If a lateral force is applied, therefore, the connection portions of the precast concrete reinforcing block units 2 on the upper and lower sides are resistant to the lateral force through the shear forces generated from the sections of the protrusions 25.

Otherwise, as shown in FIGS. 19 and 20, the precast concrete reinforcing block unit 2 has the shape of a wedge with top and bottom corresponding to each other.

In this case, the positions of the precast concrete reinforcing block units 2 on the upper and lower sides accurately correspond to each other by means of the slant surfaces of top of the lower side precast concrete reinforcing block unit 2 and the slant surfaces of bottom of the upper side precast concrete reinforcing block unit 2.

FIG. 21 is a perspective view showing a precast concrete reinforcing block unit for a shear wall according to the present invention, and FIG. 22 is a perspective view showing a precast concrete reinforcing block assembly using the precast concrete reinforcing block units of FIG. 21.

As shown in FIG. 22, if the existing member 1c is a shear wall, the precast concrete reinforcing block units 2 are stacked on top of each other on the front surface of the shear wall, and next, each precast concrete reinforcing block unit 2 is fixed to the shear wall by means of the anchor members 5.

Anchor holes 21 for fastening the anchor members 5 are formed in the first receiving grooves 23 and the second receiving grooves 23.

The first external reinforcing bars 6 and the second external reinforcing bars 7 are arranged in the first receiving grooves 23 and the second receiving grooves 24.

An explanation of a method for constructing the precast concrete reinforcing block assembly as mentioned above with reference to FIGS. 1 to 20 according to the present invention will be given below.

According to the method for constructing the precast concrete reinforcing block assembly, as a first step, the plurality of precast concrete reinforcing block units 2 are stacked on top of each other on the outer surfaces of the existing member 1a, 1b, or 1c.

If it is desired that the plurality of precast concrete reinforcing block units 2 are tightly built on the existing member 1a, 1b, or 1c, the existing member 1a, 1b, or 1c is first cleaned by removing surface paint and foreign substances therefrom. In some cases, coated concrete degraded on the surface of the existing member 1a, 1b, or 1c is removed.

If it is desired that the plurality of precast concrete reinforcing block units 2 are fixed to the existing member 1a, 1b, or 1c through the anchor members 5, the anchor fixing holes are first pre-drilled on positions where the anchor members 5 are built.

The plurality of precast concrete reinforcing block units 2 are built continuously on the outer surfaces of the existing member 1a, 1b, or 1c in the longitudinal direction of the member. In this case, the plurality of precast concrete reinforcing block units 2 are stacked up and down on top of each other in such a way as to allow the hollow holes 20 formed therein to communicate with one another.

The plurality of precast concrete reinforcing block units 2 are surrounded only on one side of the existing member 1a, 1b, or 1c or surrounded on the entire surface of the existing member 1a, 1b, or 1c according to the reinforcing purpose or range of the existing member 1a, 1b, or 1c.

The anchor member 5 is inserted into the anchor hole 21 formed to pass through each precast concrete reinforcing block unit 2 in the horizontal direction of the precast concrete reinforcing block unit 2, so that the end of the anchor member 5 is inserted into the anchor fixing hole of the existing member 1a, 1b, or 1c. Next, epoxy is filled in the anchor fixing hole to fix the anchor member 5 thereto.

After the anchor member 5 has been fixed, the fixing nut 51 is fastened to the rear end of the anchor member 5 inside the anchor receiving groove 22 of the precast concrete reinforcing block unit 2, so that the precast concrete reinforcing block unit 2 is fixed to the existing member 1a, 1b, or 1c.

The non-shrinkable mortar or epoxy is filled in the anchor receiving groove 22, thereby preventing the rear end of the anchor member 5 from being exposed to outdoor air.

Epoxy, non-shrinkable mortar, or concrete is filled in a space portion between the precast concrete reinforcing block unit 2 and the existing member 1a, 1b, or 1c.

Next, as a second step, the internal reinforcing bars 3 are insertedly built into the hollow holes 20 of the plurality of precast concrete reinforcing block units 2 stacked up and down on top of each other.

After the plurality of precast concrete reinforcing block units 2 have been stacked on top of each other, the internal reinforcing bars 3 such as reinforced bars, steel bars, and the like are insertedly built in the hollow holes 20 communicating up and down with one another.

As a last step, the filling materials 4 such as non-shrinkable mortar are filled in the hollow holes 20.

As a result, the internal reinforcing bars 3 are fixed to the interiors of the hollow holes 20 and thus integral with the plurality of precast concrete reinforcing block units 2, thereby increasing the internal force against the axial and lateral forces of the member and thus having excellent seismic strengthening.

INDUSTRIAL APPLICABILITY OF INVENTION

The precast concrete reinforcing block assembly for seismic strengthening according to the present invention is configured to allow the precast concrete reinforcing block units pre-made at a plant to be stacked up and down on the outer surfaces of the existing member, while the hollow portions formed on the precast concrete reinforcing block units being communicating with one another, thereby having no risk of corrosion to cause no additional fire resistance coating, and further, the precast concrete reinforcing block units are made at a plant so that their finishing quality is excellent.