JP6971064B2 - Reinforcement method - Google Patents

Description

The present invention relates to a reinforcing bar arrangement method for arranging reinforcing bars at predetermined positions.

In the renovation work of a reinforced concrete building, etc., when adding building equipment, etc., by core removal work using diamond bits etc., to pass piping and wiring to the existing reinforced concrete beam (an example of the frame) A new through hole may be formed.

In such a case, the defect of the concrete in the newly formed through hole portion may cause a problem such as insufficient cover thickness of the concrete for the stirrup bar adjacent to the through hole.
When such a problem occurs, the technique of bending the reinforcing bar to bypass it (see, for example, Patent Documents 1 and 2) is used, and the site where the cover thickness is insufficient in the stirrup bar is designated as a recommended moving site. By bending and deforming both ends of the recommended movement part and moving the recommended movement part to the opposite side of the through hole, it is conceivable to solve the insufficient cover thickness of the concrete.

Japanese Unexamined Patent Publication No. 2009-103371 (paragraph 0053, FIG. 8, etc.) Japanese Unexamined Patent Publication No. 2008-175006 (Fig. 3, etc.)

However, since there is a limit to reducing the bending radius of the reinforcing bar, in order to bend and deform both ends of the recommended moving part of the stirrup bar to move the recommended moving part, bend over a long range of the stirrup bar. It needs to be transformed. Therefore, it is necessary to scrape the concrete in an area extremely wider than the area of the recommended movement part, which causes a problem that the work becomes complicated.

In view of this situation, a main object of the present invention is to provide a reinforcing bar arrangement method capable of easily moving a recommended movement site of a reinforcing bar to be treated.

The first characteristic configuration of the present invention is a reinforcing bar arrangement method, in which a reinforcing bar portion located at a recommended movement site of a reinforcing bar to be treated is cut and removed.
By connecting the joint structure of the longitudinal ends respectively splicing format superimposed on the same side of each of the two cut ends of the treatment target rebar straight connecting reinforcing bar, to the moving recommended site of the treatment target rebar The point is to replace the located reinforcing bar portion with the connecting reinforcing bar moved in parallel from the reinforcing bar portion.

According to this configuration, in the reinforcing bar to be treated, for example, the recommended movement part such as the part where the concrete cover thickness is insufficient or the part which interferes with the arrangement of the opening reinforcing bar is cut and removed, and the length of the linear connecting reinforcing bar is formed. By connecting each of both ends of the direction to the same side of each of the cut ends of the rebar to be treated by a lap joint type joint structure, the recommended movement part of the rebar to be treated can be connected to the connecting rebar moved in parallel from there. It can be moved in parallel in the form of replacement.
Therefore, it is possible to easily move the recommended movement part of the rebar to be treated, and there are inconveniences such as insufficient concrete cover thickness of the recommended movement part and the recommended movement part interfering with the reinforcement work of the opening reinforcing bar. It can be avoided.

Moreover, by moving the recommended movement part using the lap joint type joint structure, the rebar to be treated is shorter than the case where both ends of the recommended movement part of the rebar to be treated are bent to move the recommended movement part. It is possible to complete the movement of the recommended movement part within the range. Therefore, it is possible to narrow the range of concrete chipping in the repair work and the like, and it is possible to improve the workability of the repair work and the like.

In the second characteristic configuration of the present invention, when an opening is formed in an existing reinforced concrete structure, the existing reinforcing bar arranged on the opening side is set as the treatment target reinforcing bar.
By connecting each of the longitudinal ends of the linear of the connecting reinforcing bars on the side away from the opening of each of the two cut ends of the treatment target rebar, wherein located on said mobile recommended site of the treatment target rebar The point is to replace the reinforcing bar portion with the connecting reinforcing bar.

According to this configuration, when an opening is formed in an existing reinforced concrete structure, the recommended movement portion of the existing treatment target reinforcing bar arranged on the opening side can be easily moved to the side away from the opening. It is possible to avoid inconveniences such as insufficient concrete cover thickness at the recommended movement part and the recommended movement part interfering with the reinforcement work of the opening reinforcing bar.
Moreover, as described above, since the movement of the recommended movement part can be completed within a short range of the reinforcing bar to be treated, the chipping range of the concrete can be narrowed, and an opening is efficiently formed in the existing reinforced concrete structure. be able to.

The third characteristic configuration of the present invention is to fix both reinforcing bars in a state where the gap between both outer surfaces is larger than that of welding the outer surface of the reinforcing bar to be treated and the outer surface of the connecting reinforcing bar as the joint structure of the lap joint type. The point is to use a mechanical joint structure for connecting the rebar to be treated and the connecting rebar with a fixture.

According to this configuration, by using the above-mentioned mechanical joint structure as the lap joint type joint structure, it is possible to secure a large translation allowance for the reinforcing bars to be treated as compared with the structure connected by welding. Therefore, even if a translation allowance larger than that of the structure connected by welding is required, it can be appropriately dealt with.
Further, the mechanical joint structure can shorten the overlapping range (joint range) between the reinforcing bars as compared with the joint structure by welding. Therefore, it is possible to further narrow the range of concrete chipping in the repair work and the like, and it is possible to further improve the workability of the repair work and the like.

The figure which shows the state before the repair of the part to be repaired of a building The figure which shows the bar arrangement method (A) A diagram showing a bar arrangement method, (b) A sectional view taken along line IIIb-IIIb. The figure which shows the state before the repair of the part to be repaired of a building The figure which shows another embodiment of the bar arrangement method

An embodiment of the bar arrangement method according to the present invention will be described with reference to the drawings.
In this bar arrangement method, a reinforcing bar having a recommended movement site for which movement is recommended due to various circumstances is set as a treatment target reinforcing bar, and the recommended movement site of the treatment target reinforcing bar can be easily moved.
In the present embodiment, as shown in FIG. 1, in the repair work for forming a through hole 2 (an example of an opening) for equipment piping in an existing reinforced concrete beam 1 which is an example of an existing reinforced concrete structure, the main arrangement is performed. The case of using the muscle method is taken as an example.

As shown in FIG. 1, the existing reinforced concrete beam 1 is configured by embedding an upper end bar 1a, a lower end bar 1b, and a stirrup bar 1c as an existing reinforcing bar 1A in a concrete 1B having a rectangular cross-sectional shape.
The upper end bar 1a is a reinforcing bar extending in the beam extending direction (left-right width direction in FIG. 1) on the upper end side inside the reinforced concrete beam 1. The lower end bar 1b is a reinforcing bar extending in the beam extending direction on the lower end side inside the reinforced concrete beam 1. The stirrup bar 1c is a reinforcing bar extending in the beam circumferential direction orthogonal to the beam extending direction and surrounding the upper end bar 1a and the lower end bar 1b, and is arranged at a predetermined pitch in the beam extending direction.

A core removal work using a diamond bit or the like is carried out on such a through hole forming portion of the reinforced concrete beam 1 to form a through hole 2 penetrating the reinforced concrete beam 1. The stirrup bar 1c (adjacent stirrup bar 1c on the right side of the through hole 2 in FIG. 1) is abnormally close to the through hole 2, and as shown in FIG. 2A, the peripheral edge of the through hole 2 The concrete cover thickness T, which is the distance between the stirrup bar 1c and the outer surface, may be less than the predetermined concrete cover thickness Ts.

Therefore, as shown in FIG. 2, the stirrup bar 1c that is abnormally close to the through hole 2 is set as the treatment target reinforcing bar A, and among the treatment target reinforcing bars A, the concrete cover thickness T is the predetermined concrete cover thickness Ts. The part that is less than is designated as the recommended movement part B.
Here, the rebar A to be treated and the recommended movement site B are specified, for example, non-destructive inspection for confirming the position of the existing rebar with a sensor using electromagnetic induction without scraping the concrete, or partial concrete. It can be performed at an appropriate timing by performing a visual inspection for visually confirming the position of the existing reinforcing bar by chipping.
Then, using the bar arrangement method according to the present invention, the recommended movement portion B is moved in parallel to the side away from the through hole 2 to secure a concrete cover thickness T of a predetermined concrete cover thickness Ts or more.

Specifically, although not shown, the existing concrete 1B of the reinforced concrete beam 1 is scraped to expose the outer peripheral surface of the entire portion including the recommended movement portion B of the reinforcing bar A to be treated. Here, in the bar arrangement method according to the present invention, the movement of the recommended movement site B is completed within a short range of the rebar A to be treated, as compared with the case where the rebar is bent and deformed to move the recommended movement site B. The chipping range of concrete 1B may be as narrow as possible.

Then, as shown in FIG. 2B, both ends b1 of the existing reinforcing bar portion P1 located at the recommended movement site B of the reinforcing bar A to be treated are cut, and the existing reinforcing bar portion P1 from which both ends b1 are cut is cut. By removing it, the recommended movement site B of the rebar A to be treated is once cut and removed.

After that, as shown in FIG. 2 (c), a linear connecting reinforcing bar 3 slightly longer than the cut existing reinforcing bar portion P1 is prepared, and each of the longitudinal end portions 3a of the connecting reinforcing bar 3 is treated. Both cut end portions a1 of A are connected to the side away from each through hole 2 (an example on the same side, an example on the recommended movement side) by a lap joint type joint structure K. By doing so, the existing reinforcing bar portion P1 located at the recommended movement site B of the rebar A to be treated is replaced with the linear connecting reinforcing bar 3, and the recommended moving site B is separated from the through hole 2 ( Move in parallel to the recommended movement side).

As a lap joint type joint structure K, as shown in FIG. 2 (c), each of both ends 3a in the longitudinal direction of the connecting reinforcing bar 3 and each of both cut ends a1 of the reinforcing bar A to be treated are welded by flare welding or the like. A structure connected by the part 4 can be used. The translation allowance W1 in this case is the sum of the diameter of one reinforcing bar and the thickness dimension of the welded portion 4.

Further, more preferably, as a lap joint type joint structure K, as shown in FIG. 3A, each of each of the longitudinal end portions 3a of the connecting reinforcing bar 3 and each of both cut end portions a1 of the reinforcing bar A to be treated. It is also possible to use a structure in which and are connected by a mechanical joint structure.
In the example of FIG. 3A, as a mechanical joint structure, the treatment target reinforcing bar A and the connecting reinforcing bar A and the connecting reinforcing bar are in a state where the gap between both outer surfaces is larger than that when the outer surface of the treatment target reinforcing bar A and the outer surface of the connecting reinforcing bar 3 are welded. In the fixture 5 for fixing the 3, a joint structure for connecting the reinforcing bar A to be treated and the connecting reinforcing bar 3 is used.

As shown in FIG. 3B, the fixture 5 has a tubular main body 5A through which two reinforcing bars can be inserted, and each of the two reinforcing bars in a state where the two reinforcing bars inserted through the tubular main body 5A are separated from each other. It is configured to include a wedge member 5B that is pressed against the inner peripheral surface of the tubular main body 5A. An insertion hole 5a is formed in the central portion of the outer peripheral portion of the tubular main body 5A in the tubular width direction, and the wedge member 5B can be inserted into the inside of the tubular main body 5A through the insertion hole 5a.

Therefore, as shown in FIG. 3, the tubular main body 5A has the tubular main body 5A inserted with each of the longitudinal end portions 3a of the connecting reinforcing bar 3 and both the cut end portions a1 of the reinforcing bar A to be treated. By inserting the wedge member 5B between the connecting reinforcing bar 3 inside the tubular main body 5A and the treatment target reinforcing bar A through the insertion hole 5a, the connecting reinforcing bar 3 and the treatment target reinforcing bar A are connected by the wedge member 5B in a separated state. Each of the reinforcing bar 3 and the reinforcing bar A to be treated is strongly pressed against the inner surface of the tubular main body 5A, and each of both ends 3a in the longitudinal direction of the connecting reinforcing bar 3 and each of both cut ends a1 of the reinforcing bar A to be treated are easily connected. be able to.

Therefore, by adopting a structure in which the joint structure K of the lap joint type is connected by the mechanical joint structure shown in FIG. 3, the movement of the recommended movement portion B of the reinforcing bar A to be treated is not performed by welding. It can be done easily and safely in the environment.

Further, the translation allowance W2 of the structure connected by the mechanical joint structure shown in FIG. 3 is the sum of the diameter of one reinforcing bar and the gap width of two reinforcing bars by the wedge member 5B. Here, the gap width between the two reinforcing bars due to the wedge member 5B is set to be larger than that of the welded portion 4. Therefore, the translation allowance W2 of the structure connected by the mechanical joint structure is larger than the translation allowance W1 of the structure connected by the welded portion 4 (see FIG. 2C).
Therefore, the structure connected by the mechanical joint structure shown in FIG. 3 is preferably used when a larger translation allowance than the structure connected by the welded portion 4 shown in FIG. 2 (c) is required. can.

Further, the mechanical joint structure shown in FIG. 3 has a shorter overlapping range (joint range) between the reinforcing bars than the structure connected by the welded portion 4 (see FIG. 2C). Therefore, the chipping range of concrete can be made narrower.

Although not shown, the portion of the reinforced concrete beam 1 in which the concrete 1B is scraped after the recommended movement portion B of the reinforcing bar A to be treated is moved in parallel to the side away from the through hole 2 (treatment target). A new concrete is placed in the peripheral portion of the reinforcing bar A), and as shown in FIG. 4, the reinforcing bar A to be treated is buried again in the reinforced concrete beam 1.
The work of forming the through hole 2 in the through hole forming portion of the reinforced concrete beam 1 is performed before moving the movement recommended portion B of the treatment target reinforcing bar A, but in some cases, the movement recommended movement portion B of the treatment target reinforcing bar B is performed. It may be carried out after moving.

[Another Embodiment]
(1) In the above-described embodiment, each of the longitudinal end portions 3a of the linear connecting reinforcing bar 3 is placed on the same side of both cut end portions a1 of the reinforcing bar A to be treated, so that the relay reinforcing bar or the like is not interposed. An example is shown in which the recommended movement portion B of the reinforcing bar A to be treated is moved in parallel by one step of the translation allowance due to the lap joint type joint structure K by connecting with the lap joint type joint structure K.
Not limited to this, for example, each of the longitudinal end portions 3a of the linear connecting reinforcing bar 3 is overlapped in a plurality of stages so as to interpose a relay reinforcing bar or the like on the same side of each of both cut end portions a1 of the reinforcing bar A to be treated. By connecting with the joint structure K of the joint type, the recommended movement portion B of the reinforcing bar A to be treated may be moved in parallel by a plurality of translation allowances due to the joint structure K of the lap joint type.

In this case, for example, as shown in FIG. 5A, in the rebar A to be treated, a portion including the recommended movement portion B in the central portion in the longitudinal direction is cut and removed, and both cut end portions a1 of the rebar A to be treated are cut and removed, respectively. The one end portion 6a (outer end portion) in the longitudinal direction of the linear relay reinforcing bar 6 is connected to the joint structure K by the first-stage lap joint type joint structure K.
Then, both ends 3a in the longitudinal direction of the linear connecting reinforcing bars 3 are connected to each of the other ends 6b (inner end) in the longitudinal direction of the two relay reinforcing bars 6 by a second-stage lap joint type joint structure K. do.

By doing so, it is possible to move the recommended parts of the rebar to be treated in parallel by the translational movement allowance of two stages by the joint structure K of the lap joint type.
In the illustrated example, the lap joint type joint structure K is connected by a mechanical joint structure, so that the translation allowance W3 in this case is the diameter of one reinforcing bar and two reinforcing bars by the wedge member 5B. It is twice the total with the gap width of. Although not shown, the lap joint structure K may be connected by the welded portion 4, and the translation allowance in that case is the diameter of one reinforcing bar and the welded portion 4. It is twice the total with the thickness dimension.

Further, by further increasing the number of stages of the joint structure K of the lap joint type between the both cut end portions a1 of the reinforcing bar A to be treated and the both ends 3a of the linear connecting reinforcing bar 3 in the longitudinal direction, the lap joint type can be obtained. It is also possible to move the recommended movement portion B of the reinforcing bar A to be treated in parallel by three or more stages of translation allowance due to the joint structure K.

(2) In the above-described embodiment, among the reinforcing bars A to be treated, the portion where the concrete cover thickness T is less than the predetermined concrete cover thickness Ts is designated as the recommended movement portion B, and the recommended movement portion B is set to the side away from the through hole 2. The case of moving in parallel is shown as an example.
Not limited to this, for example, as shown in FIG. 5B, a portion of the reinforcing bar A to be treated that interferes with the reinforcement work of the opening reinforcing bar 7 arranged behind the reinforcing bar A is recommended to be moved. B may be used, and the recommended movement portion B may be moved in parallel to the side away from the through hole 2 (that is, the side away from the opening reinforcing bar 7).
By doing so, it is possible to prevent the recommended movement portion B of the treatment target reinforcing bar A from interfering with the reinforcing bar arrangement work of the opening reinforcing bar 7.

(3) In the above-described embodiment, the case where the recommended movement portion B of the rebar A to be treated is moved to the side away from the opening (through hole 2) is shown as an example, but the movement direction of the recommended movement portion B is recommended to move. The movement of the part B can be in an appropriate direction recommended.

(4) In the above-described embodiment, as an example of the opening formed in the existing reinforced concrete structure portion (reinforced concrete beam 1), the through hole 2 for equipment piping is shown as an example, but the through hole for different purposes is shown. It may be a notch or a notch.

(5) In the above-described embodiment, when an opening (through hole 2) is formed in an existing reinforced concrete structure portion (reinforced concrete beam 1), the existing reinforcing bar arranged on the opening side is used as the treatment target reinforcing bar A. However, not limited to such a case, various reinforcing bars having a recommended moving site B for which movement is recommended can be designated as the treatment target reinforcing bar A.

1 Reinforced concrete beam 1A Existing rebar 1B Concrete 2 Through hole (opening)
3 Connecting rebar 3a Longitudinal both ends 5 Fixture A Reinforcing bar to be treated a1 Cutting end B Recommended part to move b1 Both ends K Overlaid joint structure

Claims (3)

Cut and remove the rebar part located at the recommended movement site of the rebar to be treated.
By connecting the joint structure of the longitudinal ends respectively splicing format superimposed on the same side of each of the two cut ends of the treatment target rebar straight connecting reinforcing bar, to the moving recommended site of the treatment target rebar A reinforcing bar arrangement method in which the positioned reinforcing bar portion is replaced with the connecting reinforcing bar moved in parallel from the reinforcing bar portion. When an opening is formed in an existing reinforced concrete structure, the existing reinforcing bar arranged on the opening side is set as the treatment target reinforcing bar.
By connecting each of the longitudinal ends of the linear of the connecting reinforcing bars on the side away from the opening of each of the two cut ends of the treatment target rebar, wherein located on said mobile recommended site of the treatment target rebar The reinforcing bar arrangement method according to claim 1, wherein the reinforcing bar portion is replaced with the connecting reinforcing bar. As the joint structure of the lap joint type, the reinforcing bar to be treated is provided with a fixture for fixing both reinforcing bars with a larger gap between the outer surfaces than welding the outer surface of the reinforcing bar to be treated and the outer surface of the connecting reinforcing bar. The reinforcing bar arrangement method according to claim 1 or 2, wherein a mechanical joint structure for connecting the connecting reinforcing bars is used.

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