WO2019093541A1 - Column reinforcing method using v-shaped steel tie bar - Google Patents

Abstract

The present invention relates to a column reinforcing method using a V-shaped steel tie bar, the column reinforcing method allowing: a V-shaped steel tie bar to be inserted into insertion holes formed in a conventional column and fixed in concrete, so as to confine the concrete, thereby effectively and transversally reinforcing the column; and a hardened body and the V-shaped steel tie bar filled inside the insertion holes to act as the shear connector, thereby eliminating the need for installation of a separate shear connector.

Description

Pillar reinforcement method using V-type rebar

In the present invention, a V-type reinforcing bar is inserted into an insert hole formed in an existing column to fix the concrete, thereby effectively reinforcing the column, and the cured body and the V- And a method of reinforcing a column using a V-type reinforcing bar without the need of installing a separate shear connection member.

In order to reinforce the column due to the increase in load due to the expansion of the structure or to strengthen the seismic reinforcement of the seismic design non-use structure, there is a method of reinforcing the outside of the column by means of steel plate reinforcement or concrete peeling (for example, Japanese Patent No. 10-1568016).

In the steel plate reinforcing method, an outer circumferential surface of an existing column formed of concrete is wrapped and fixed by a plurality of steel plates using a fastening member or the like.

However, since the steel sheet reinforcement method is vulnerable to fire or corrosion, the steel sheet needs to be separately refracted and rust-proofed, and a separate structure is required to secure the integrity between the steel sheet and the concrete.

The concrete method is to reinforce the column by increasing the cross-sectional area of the column by placing the reinforcing bars on the outside of the existing columns and installing the formwork.

Unlike the steel plate reinforcement method, the method for jacketing the concrete is advantageous in that it is unnecessary to separate fireproofing and rustproofing, and is advantageous in securing integrity with existing concrete columns.

However, it is difficult to directly apply the cross tie installed to prevent buckling of column main girder or confinement due to interference of existing column. As a result, the existing column is pierced with a predetermined depth, and the anchor is installed to fix the cross tie.

In addition, since the appropriate thickness of cover is required to be secured outside the main girder and the transverse torsional reinforcement, the sectional size of the reinforced concrete column becomes more than the structural required level, which can be an uneconomical design.

In addition, when removing the existing concrete covering without increasing the section, and restoring the section after further reinforcement of the main body, a separate shear connection material should be buried in order to integrate the new and old concrete. However, these tasks are cumbersome and require a lot of air.

In order to solve the above-mentioned problems, the present invention has been applied to a case in which a column is reinforced without limitation of the column section size or the column section, Thereby providing a reinforcement method.

According to a preferred embodiment of the present invention, there is provided a method of reinforcing a reinforced concrete reinforced concrete column having a main reinforcing bar and a reinforcing bar surrounding the main reinforcing steel, the method comprising the steps of: (a) removing a covered concrete of an existing column ; (b) forming a plurality of insertion holes by drilling deep core concrete inside the main pipe so as to have a predetermined width and depth; (c) installing a V-shaped band reinforcing bar having a pair of legs bent into a V-shape so that an inner side of the bent portion is in contact with the outer side of the main muscle and a pair of legs are inserted into the insertion hole; And (d) restoring a section by placing a cured body on the outer surface of the existing column from which the coated concrete has been removed; The present invention provides a column reinforcing method using a V-type reinforcing bar.

According to another preferred embodiment of the present invention, there is provided a column reinforcing method using a V-type reinforcing bar, wherein the upper surface of the insertion hole is inclined so that the height increases toward the outside.

According to another preferred embodiment of the present invention, there is provided a column reinforcing method using a V-type reinforcing bar, wherein the cured body is a shotcrete sprayed on a construction surface.

According to another preferred embodiment of the present invention, in the step (d), the cured body is composed of a first cured body to be filled in the insertion hole and a second cured body to form a coating, And then the second cured body is poured after being cured. The present invention also provides a column reinforcing method using a V-type reinforcing bar.

According to another preferred embodiment of the present invention, there is provided a column reinforcing method using a V-type reinforcing bar, wherein a wire mesh is further provided on an outer surface of an existing column from which the covering concrete is removed after the step (c) do.

According to another preferred embodiment of the present invention, there is provided a column reinforcing method using a V-type reinforcing bar, wherein the insertion hole is formed to communicate with a laterally adjacent insertion hole.

According to another preferred embodiment of the present invention, the V-type reinforcing bar coupled to each main body is composed of a V-shaped reinforcing bar adjacent to the transverse direction and a single member whose ends are connected to each other by the connecting portion. A method of reinforcing a column using a bar reinforcement is provided.

The present invention has the following effects.

First, the V-type steel bar, which is inserted into the insertion hole formed in the concrete part of the existing column, is fixed in the existing concrete to prevent the buckling of the existing main course as well as the newly added main bar, The seismic performance of the column can be greatly increased. As a result, existing columns can be effectively collapsed.

Second, since the cured body filled up to the inside of the insertion hole and the V-shaped reinforcing bar inserted through the insertion hole and the concrete covering portion serve as shear connectors, it is possible to provide a column reinforcing method in which a separate shear connector is not required. Accordingly, the working process is simple when the column is reinforced, so that the workability can be improved and the effect of shortening the air can be obtained.

Third, since the leg portion of the V-type steel bar is inserted and seated in the insertion hole, there is no need to fix the V-type steel bar to the main bar, and a separate fixing member for maintaining the vertical direction with the main bar is unnecessary.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram showing a step-by-step process of a column reinforcing method using a V-type band reinforcing bar of the present invention. FIG.

Fig. 2 is a perspective view showing the coupling relationship of V-type band bars. Fig.

3 is a side cross-sectional view showing a joined state of the V-shaped band steel bar.

4 is a plan sectional view showing a state in which additional main ropes are laid.

5 is a side cross-sectional view of a column showing an insertion hole according to an embodiment;

6 is a side cross-sectional view of a column in which a cured body composed of first and second cured bodies is placed.

7 is a plan sectional view of a column provided with a wire mesh;

8 is a view showing an embodiment in which the insertion holes communicate with each other and a reinforcing strip reinforcing bar;

9 is a perspective view showing an embodiment of a V-type band reinforcing bar.

10 is a plan sectional view showing the coupling relationship of the V-type band bar shown in FIG.

In order to accomplish the above object, the present invention provides a method of reinforcing a pillar reinforced concrete structure having a main reinforcing bar and a reinforcing bar surrounding the main reinforcing steel, Removing the coated concrete of the existing column to expose the main beam; (b) forming a plurality of insertion holes by drilling deep core concrete inside the main pipe so as to have a predetermined width and depth; (c) installing a V-shaped band reinforcing bar having a pair of legs bent into a V-shape so that an inner side of the bent portion is in contact with the outer side of the main muscle and a pair of legs are inserted into the insertion hole; And (d) restoring a section by placing a cured body on the outer surface of the existing column from which the coated concrete has been removed; And a control unit.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings and preferred embodiments.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram showing a step-by-step process of a column reinforcing method using a V-type reinforcing bar according to the present invention. And FIG. 2 is a perspective view showing the coupling relationship of the V-type band steel bars, FIG. 3 is a side sectional view showing the joined state of the V-type band steel bars, and FIG. 4 is a plan view showing a state in which additional main bars are laid.

As shown in FIG. 1, a column reinforcing method using a V-type reinforcing bar according to the present invention includes a reinforcing concrete reinforced concrete column 1 having a main girder 11 and a girder 12 surrounding the main girder 11, (A) removing the covered concrete (13) of the existing column (1) so as to expose the outer major axis (11); (b) drilling deep core concrete (14) inside main beam (11) with a predetermined width and depth to form a plurality of insertion holes (141); (c) The V-shaped band bar 15 having a pair of legs 151 bent in a V-shape is in close contact with the outer side of the main bar 11, and the pair of legs 151 Inserting it into the insertion hole (141); And (d) restoring a section by placing a cured body 16 on the outer surface of the existing column 1 from which the covered concrete 13 has been removed; And a control unit.

In the step (a), the covered concrete 13 of the existing column 1 is removed to expose the external major axis 11 (FIG. 1 (a)).

Next, (b) the deep concrete 14 inside the main rope 11 is punched to have a predetermined width and depth to form a plurality of insertion holes 141 (FIG. 1 (b)).

That is, the deep concrete 14 inside the main beam 11 is drilled on the basis of the main beam 11 exposed in the step (a).

Thus, the insertion hole 141 is formed at the position of the main bar 11.

The insertion hole 141 is a portion into which the cured body 16 forming the coating is filled in the portion into which the V-shaped band steel bar 15 is inserted.

And (c) a V-shaped band reinforcing bar 15 having a pair of legs 151 bent in a V-shape, the inside of the bent portion being in close contact with the outside of the main bar 11, Is inserted into the insertion hole 141 (Fig. 1 (c)).

A concrete coupling relation of the V-type band bar 15 is shown in Fig.

The V-shaped band reinforcing bar 15 is coupled to the outside of the main bar 11 such that the leg portion 151 is inserted into the insertion hole 141 and the inside of the bent portion is brought into close contact with the outside of the main bar 11.

The V-type band reinforcing bar 15 is fixed in the existing concrete to prevent the existing main bar 11 from buckling. As shown in FIG. 4, when the newly added main rope 11 'is present, it is also closely attached to the newly added main rope 11' to prevent buckling of the additional main rope 11 '.

The V-type reinforcing bar 15 effectively restrains the inner concrete together with the reinforcing bars 12 to greatly increase the seismic performance of the column.

The height of the insertion hole 141 formed in step (b) is preferably slightly larger than the diameter of the V-shaped band bar 15 for smooth insertion of the V-shaped band bar 15.

Since the leg 151 of the V-type band 15 is inserted and seated in the insertion hole 141, the V-type band 15 can be fixed separately to the main bar 11 or perpendicular to the main bar 11 No separate fasteners are required to maintain.

It is sufficient that the V-type band reinforcing bar 15 is bound to the main rope 1 by a binding line so as to prevent only the deviation.

It is preferable that the width of the insertion hole 141 is formed to be slightly narrower than the distance between the pair of legs 151 of the V-shaped band bar 15. In this case, when the pair of leg portions 151 of the V-shaped band reinforcing bars 15 are inserted into the insertion holes 141 in a slightly tapered state, the leg portions 151 that have been pulled out from the insertion holes 141 are stretched And is fixed to both sides of the insertion hole 141. Therefore, it is possible to fix the V-type band 15 without binding wires.

Finally, (d) the cured body 16 is placed on the outer surface of the existing column 1 from which the covered concrete 13 has been removed, thereby recovering the section (FIG. 1 (d) and FIG. 3).

The cured body 16 can be placed inside the mold after the mold is installed outside the column.

In this case, the cured body 16 may be filled up to the inside of the insertion hole 141.

The cured body 16 may be composed of non-shrinkage high strength mortar having high fluidity so that the cured body 16 can be filled tightly up to the inside of the insertion hole 141.

Not only the V-type reinforcing bar 15 is inserted into the insertion hole 141 but also the cured body 16 forming the covering is filled, the integration between the cured body 16 and the existing concrete is increased.

Therefore, since the cured body 16 and the insertion hole 141 filled up to the inside of the insertion hole 141 and the V-shaped reinforcing bars 15 inserted through the cover serve as shear connectors, it is unnecessary to install a separate shear connector.

As described above, the present invention can provide a column reinforcing method in which the existing column 1 is effectively transversely strengthened but a separate shear connection member is not required, for example, when the column section size is limited or when the column is reinforced without increasing the column section .

On the other hand, as shown in FIG. 4, in addition to the existing main ropes 11, the main ropes 11 'can be further arranged.

For this purpose, the vertical grooves 142 for installing the additional main ropes 11 'may be formed in advance in the step (a) when the covered concrete 13 of the existing column 1 is removed.

5 is a side cross-sectional view of a column showing an insertion hole according to an embodiment.

As shown in FIG. 5, the upper surface of the insertion hole 141 may be inclined such that the height increases toward the outside.

Thus, when the upper surface of the insertion hole 141 is formed to be inclined, the air can be easily released from the insertion hole 141 without being trapped when the cured body 16 is placed. Accordingly, the hardened body 16 can be filled tightly in the insertion hole 141.

The lower surface of the insertion hole 141 is preferably configured to have a horizontal plane so that the V-type band reinforcing bars 15 are stably mounted.

6 is a side sectional view of a column in which a cured body composed of the first and second cured bodies is placed.

In the step (d), the cured body 16 placed on the outer surface of the existing column 1 from which the covered concrete 13 has been removed may be composed of a shotcrete sprayed on the construction surface.

The cured body 16 can be placed after forming a mold on the outside of the existing column 1.

It is also possible to apply the hardened body 16 with a shotcrete that is poured with compressed air without a form.

In this case, a fiber reinforcing material such as a steel fiber can be mixed into the cured body 16 for reinforcing the tensile strength of the cured body 16.

When the shotcrete is used as the cured body 16, the finished surface is rough. Therefore, after the shotcrete is applied, a separate finishing treatment is required on the outside.

6, in the step (d), the cured body 16 is composed of a first cured body 161 filled in the insertion hole 141 and a second cured body 162 forming a coating The first curing body 161 is filled in the insertion hole 141, and then the second curing body 162 is placed.

The hardened body 16 may not be properly filled into the insertion hole 141 when shotcrete is applied.

Therefore, the first cured body 161 is first filled into the insertion hole 141, and then the second cured body 162 is placed outside after the curing is completed, thereby preventing a gap from being formed in the insertion hole 141 .

The first cured body 161 may use the same material as the second cured body 162, but a filler such as epoxy may be used in consideration of ease of filling and strength of the cured body.

7 is a plan sectional view of a column provided with a wire mesh.

As shown in FIG. 7, after the step (c), a wire mesh 17 may be further provided on the outer surface of the existing column 1 from which the coated concrete 13 has been removed.

The wire mesh 17 may be installed to reinforce the tensile strength of the cured product 16 to be shotcrete and to increase the adhesion of the cured product 16 to the cured product 16.

8 is a view showing an embodiment in which the insertion holes communicate with each other and reinforcing strip reinforcing bars.

The insertion hole 141 may be formed to communicate with the insertion hole 141 which is adjacent to the transverse direction.

It is preferable that the insertion hole 141 is formed so that the cross section of the existing column 1 is small or the horizontal interval between the V-shaped band bars 15 is narrow.

The side view shown in Fig. 8 (a) shows an embodiment in which the insertion hole 141 is communicated.

8 (b) is a cross-sectional view taken along line A-A 'in FIG. 8 (a), and FIG. 8 (c) shows an embodiment of a reinforcing strip reinforcing bar 12'.

The V-type reinforcing bars 15 may be joined to the existing reinforcing bars 12. However, if the spacing between the existing strip bars 12 is wide, a reinforcing strip bar 12 'is added between the existing bar bars 12 and a V-type bar bar 15 is joined to the reinforcing bar bar 12' (Fig. 8 (a)).

In this case, the reinforcing strip reinforcement 12 'is formed in a U-shape as shown in FIG. 8 (c), and a pair of the reinforcement strip reinforcement 12' can be engaged with both sides as shown in FIG. 8 (b).

The reinforcement strip reinforcement 12 'is preferably configured to be closed to restrain the inner concrete. 8 (c), the end portion of the reinforcing strip reinforcing bar 12 'is bent at 45 degrees to be embedded in the hardened body 16, whereby the hardened body 16 can be fixed.

Fig. 9 is a perspective view showing an embodiment of a V-type band reinforcing bar, and Fig. 10 is a flat cross-sectional view showing a coupling relation of the V-type band reinforcing bar shown in Fig.

9 and 10, the V-shaped reinforcing bars 15 coupled to the respective main ropes 11 are supported by the transversely adjacent V-shaped reinforcing bars 15 and the connecting portions 152, May be constituted by one member connected to each other.

That is, the plurality of V-type strip reinforcing bars 15 can be manufactured by bending one reinforcing bar and integrating them.

Accordingly, if the V-type reinforcing bars 15 installed on one side of the existing column are integrally connected, the effect of constraining concrete by the V-type reinforcing bar 15 can be increased.

In addition, since the fixing force is increased by the connecting portion 152, the length of the leg portion 151 can be shortened. In this case, the depth of the insertion hole 141 can be minimized.

Since the plurality of V-shaped reinforcing bars 15 are connected to each other and can be installed at a time, only a part of the V-shaped reinforcing bars 15 are bound to the main ropes 11 by binding lines, .

In the column reinforcing method using the V-type reinforcing bar, the V-type reinforcing bar serves as a shear connection member, so that it is not necessary to provide a separate shear connection member. Thus, the work process is simplified and the air can be shortened. In addition, the V-type steel reinforcing bars are inserted into the insertion holes formed in the existing column concrete portion, and thus, the existing columns can be effectively transversely reinforced without increasing the column cross section or size.

Claims (7)

The present invention relates to a method of reinforcing a reinforced concrete reinforced concrete column 1 having a main girder 11 and a girder 12 surrounding the main girder 11, (a) removing the covered concrete (13) of the existing column (1) so that the external main beam (11) is exposed; (b) drilling deep core concrete (14) inside main beam (11) with a predetermined width and depth to form a plurality of insertion holes (141); (c) The V-shaped band bar 15 having a pair of legs 151 bent in a V-shape is in close contact with the outer side of the main bar 11, and the pair of legs 151 Inserting it into the insertion hole (141); And (d) restoring a section by placing a cured body (16) on the outer surface of the existing column (1) from which the covered concrete (13) has been removed; Wherein the reinforcing member is made of a V-type reinforcing bar. The method of claim 1, Wherein the upper surface of the insertion hole (141) is inclined so that the height of the upper surface of the insertion hole (141) increases toward the outside. The method of claim 1, Wherein the cured body (16) is a shotcrete sprayed on a work surface. 4. The method of claim 3, In the step (d) The cured body 16 is composed of a first cured body 161 which is filled in the insertion hole 141 and a second cured body 162 which forms a covering and the first cured body 161) is cured and then the second cured body (162) is poured. 4. The method of claim 3, After the step (c) And a wire mesh (17) is further provided on the outer surface of the existing column (1) from which the covered concrete (13) is removed. The method of claim 1, Wherein the insertion hole (141) is formed to communicate with the insertion hole (141) adjacent to the transverse direction. The method of claim 6, The V-type reinforcing bars 15 connected to the respective main ropes 11 are constituted by a single member in which ends of the leg portions 151 are mutually connected by the transversely adjacent V-shaped reinforcing bars 15 and the connecting portions 152 Wherein the reinforcing member is made of a V-type reinforcing bar.

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