JP4227557B2 - Reinforced wall construction method and existing wall structure of existing concrete wall - Google Patents

Description

The present invention relates to a method for increasing the wall of an existing concrete wall and an increased wall structure for increasing the thickness of an existing building made of reinforced concrete or steel reinforced concrete.

Conventionally, in such an increased striking wall method, as shown in FIG.
After placing an anchor a into main structures x and x 'such as columns and beams surrounding the wall w1 of a steel reinforced concrete building, and fixing both ends of the reinforcing bar s to the anchor a by welding or the like , Mortar is placed in a formwork, mortar is sprayed as it is, and it is applied, cured, and hardened to construct an increased striking wall w2 to increase the thickness. there were.

We do not conduct prior art searches at the research and development stage or application stage, and do not know the prior art documents to be described.

However, in the above construction method, the outer peripheral portion of the increased striking wall w2 directly hits the main structure x, x ′, but stress concentrates on the part, so that the increased striking wall w2 is thinner. Since splitting is likely to occur on the outer peripheral portion of the wall w2, the increased striking wall w2 must be formed thick, and even if the wall is thickened, splitting does not always occur. The splitting prevention muscle (not shown) had to be arranged on the outer periphery of the wall w2, and the work was troublesome.

The present invention is based on the above-described prior art, and in view of the problems such as the increased striking wall becoming thicker and the need for the work of arranging splitting prevention bars, columns and beams located on the outer peripheral portion of the existing concrete wall to be reinforced driving an anchor people plurality husband, then each Wari裂prevention reinforcement frame arranged parallel to implanted's posts and beams anchor is anchored, and then a plurality of which is reinforcement by Wari裂prevention reinforcement frame of the end portion of the vertical and horizontal reinforcing bars were welded to Wari裂preventing reinforcing frame, the reinforcing frame and aspect rebar for preventing the Wari裂 by the way filled with mortar, the boundary portion between the pillars and beams, i.e., increases the Dakabe By arranging the splitting prevention reinforcing frame on the outer peripheral part, even if the splitting wall is thinned without arranging the splitting preventing reinforcement, the outer peripheral part of the additional striking wall is reinforced with the splitting prevention reinforcing frame, Make sure that no cracks occur on the outer perimeter of the additional striking wall. To resolve.
The “mortar etc.” in the present invention is a general term for the original “mortar” in which cement, fine aggregate and water are kneaded, and “concrete” in which cement, fine aggregate, coarse aggregate and water are kneaded. In the present invention, “mortar” is mainly used.

In short, the present invention provides a reinforcing frame for preventing splitting, in which a plurality of anchors are driven in each of the columns and beams located on the outer peripheral portion of the existing concrete wall to be reinforced, and then arranged in parallel to the columns and beams into which the anchors are driven. Is fixed with an anchor, and then the ends of the vertical and horizontal reinforcing bars arranged in the splitting prevention reinforcing frame are welded and fixed to the splitting prevention reinforcing frame, and the splitting prevention reinforcing frame and the vertical and horizontal reinforcing bars are fixed with mortar or the like. Since it was made to embed, according to such a construction method, it is possible to construct an additional striking wall that is integral with the existing concrete wall, and the outer periphery of the additional striking wall is reinforced by a splitting prevention reinforcing frame, Even if it is thin, it is possible to construct an increased striking wall that can prevent splitting at the outer periphery due to stress concentration.
In addition, since multiple connecting anchors are driven into the existing concrete wall, it is possible to improve the integrity of the constructed additional striking wall and the existing concrete wall, and match the intersection of the vertical and horizontal reinforcing bars. If it is driven into the position, it can be used for positioning of the vertical and horizontal reinforcing bars when the vertical and horizontal reinforcing bars are arranged.

In addition, a plurality of anchors that are driven into each of the columns and beams located on the outer periphery of the existing concrete wall to be reinforced, and a split that is arranged in parallel to the columns and beams into which the anchors are driven and fixed by the anchors and preventing the reinforcing frame was embedded and a plurality of vertical and horizontal reinforcing bars, which are welded to Wari裂preventing reinforcing frame ends while distribution muscle in Wari裂prevent reinforcing frame, the reinforcing frame and aspect iron wire for preventing the Wari裂 mortar Therefore, it is possible to improve the strength of the reinforcing wall composed of the additional striking wall and the existing concrete wall, and to the existing concrete wall of the additional striking wall by anchoring to the existing concrete wall or the column and the beam. Since the outer perimeter is reinforced by the reinforcing frame for preventing splitting even if the additional striking wall constructed is thin, the splitting on the outer perimeter of the additional striking wall occurs. The Can be stopped, by and thinning because that can do that to reduce the weight of the increased Dakabe itself, it is possible to reduce the burden on the skeleton side.
In addition, since a plurality of connecting anchors whose tip ends are embedded in mortar or the like are driven into the existing concrete wall, the built-in additional striking wall and the existing concrete wall are integrated. The strength of the reinforcing wall composed of the existing concrete wall can be further improved.
In addition, because the existing concrete wall and the side of the column and beam side of the reinforcing frame for preventing splitting are made uneven, it is possible to make the reinforcing frame for preventing splitting easy to fit into the injected mortar, etc. Its practical effect is significant, such as the ability to further improve its integrity.

An embodiment of the present invention will be described below with reference to the drawings.
A plurality of anchors 1, 1 a... Are attached to the main structure surrounding the existing concrete wall W to be reinforced, that is, the columns Y and Ya and the beams X and Xa (including the foundation beam), respectively. Reinforcement frames 2 which are driven in the longitudinal direction of Xa at predetermined intervals and arranged in parallel to the outer peripheral portion of the existing concrete wall W
, 2a, 3, 3a are fixed with anchors 1, 1a, and both ends of the longitudinal and horizontal reinforcing bars 4, 4a, 5, 5a, which are arranged in parallel at predetermined intervals between the opposing reinforcement frames 2, 2a, 3, 3a. The vertical and horizontal rebars 4
4a ..., 5a ... are fixed to connecting anchors 6, 6a ... driven into the existing concrete wall W. In addition, the reinforcing frames 2, 2a, 3, 3a and the existing concrete wall W or columns Y, Ya and beams X, X
A mortar 7 is injected between the reinforcing frame 2, 2a, 3, 3a, vertical and horizontal rebars 4, 4a ... 5, 5a ...
And the connecting anchors 6, 6 a... Are embedded with mortar 7 to form an increased striking wall 8.

Specifically, as shown in FIGS. 1 and 2, the existing concrete wall W and columns Y and Ya and beams X and Xa
Is not flush, the reinforcing frames 2, 2a, 3, 3a with the L-shaped cross section are connected to the existing concrete wall W and the column Y
, Ya and beams X, Xa are arranged in the corners of the existing concrete wall W, columns Y, Ya and beams X, Xa with a slight gap between them, and the existing concrete in columns Y, Ya and beams X, Xa Wall W
Anchors 1, 1 a... Are driven into the rising surface from the wall, and anchors 1, 1 a... Are attached to the members perpendicular to the existing concrete wall W in the reinforcing frames 2, 2 a, 3, 3 a, The vertical and horizontal reinforcing bars 4, 4a,..., 5, 5a are fixed to members parallel to the existing concrete wall W in FIG.

As shown in FIGS. 3 and 4, when the existing concrete wall W and the columns Y and Ya and the beams X and Xa are flush with each other, the flat reinforcing frames 2, 2a, 3 and 3a are connected to the columns Y, Ya and the beams X. , Xa are arranged with a slight gap between them, and anchors 1, 1a... Driven into the columns Y, Ya and beams X, Xa are connected to the reinforcing frames 2, 2a, 3
, 3a are fixed to the reinforcing frames 2 and 2a, respectively.
However, when reinforcing the adjacent existing concrete wall Wa, the flat reinforcing frames 2, 2a, 3,
3a is arranged at the center of the columns Y, Ya and the beams X, Xa, and the anchors 1, 1a... Driven in two rows at the center of the columns Y, Ya and the beams X, Xa are arranged on both sides of the reinforcing frames 2, 2a. The vertical and horizontal rebars 4, 4a,..., 5, 5a on the existing concrete wall W side are fixed to one side of the reinforcing frames 2, 2a, 3, 3a,
Reinforcement frames 2, 2a, 3, 3a are fixed to the other side portions of reinforcement frames 2, 2a, 3, 3a, respectively, by fixing the vertical and horizontal reinforcing bars 4, 4a ..., 5, 5a ... on the adjacent existing concrete wall Wa side. Can also be shared.

Next, the method of increasing the wall-in-wall structure of the existing concrete wall shown in FIGS.
(1) The anchors 1, 1a,... Are driven into the columns Y, Ya on both sides of the existing concrete wall W and the beams X, Xa on the upper and lower parts, respectively.
(2) The reinforcing frames 2, 2a, 3, 3a arranged in parallel to the columns Y, Ya and the beams X, Xa are connected to the anchor 1,
Secure with 1a. Specifically, the anchors 1, 1a ... are bolts, the insertion holes of the anchors 1, 1a ... are formed on the reinforcement frames 2, 2a, 3, 3a side, and the anchors 1, 1a ... inserted through the insertion holes are provided. A nut is screwed into the protruding end, or the reinforcing frames 2, 2a, 3, 3a are simply welded to the anchors 1, 1a.
(3) The opposite ends of the vertical and horizontal reinforcing bars 4, 4a,..., 5a are fixed to the opposite columns Y, Ya and beams X, Xa by welding, and the vertical and horizontal reinforcing bars 4, 4a,. It fixes to the connection anchors 6, 6a ... which were driven into the concrete wall W.
(4) While injecting mortar 7 into the gaps between the reinforcing frames 2, 2a, 3, 3a and the existing concrete wall W, columns Y, Ya and beams X, Xa, the inner part of the reinforcing frames 2, 2a, 3, 3a The mortar 7 is sprayed or applied to a predetermined thickness, or the reinforcing frames 2, 2a, 3, 3a and the vertical and horizontal reinforcing bars 4, 4a ...
5, 5a..., A frame (not shown) is assembled outside, and a mortar 7 is driven between the frame and the existing concrete wall W, and the reinforcing frames 2, 2a, 3, 3a and the vertical and horizontal reinforcing bars 4, 4a … 5,5a…
The additional striking wall 8 is completed and constructed by curing and curing the mortar 7.

In the above step (3), the vertical and horizontal reinforcing bars 4, 4a, 5, 5a, etc. need not be fixed to the connecting anchors 6, 6a, and the crossing portions of the vertical and horizontal reinforcing bars 4, 4a, 5, 5a,. Is preferably fixed by binding or welding.

Note that it is not necessary to embed all of the reinforcing frames 2, 2a, 3, 3a in the striking wall 8;
As shown in FIG. 4, a part of the reinforcing frames 2, 2 a, 3, 3 a may be increased and protrude from the striking wall 8.

As shown in FIG. 5, a plurality of protrusions 9, 9a are continuously arranged in the longitudinal direction of the side surfaces of the reinforcing concrete frames 2, 2a, 3 and 3a on the side of the existing concrete wall W and the columns Y and Ya and the beams X and Xa. Then, the side surfaces may be uneven, and the protrusions 9, 9a ... make the familiarity between the reinforcing frames 2, 2a, 3, 3a and the injected mortar 7 better. Figured.

When the existing concrete wall W is a sleeve wall, the reinforcement frames 2, 2a, 3, 3a are not arranged on the entire outer periphery, and one piece located on one side of the existing concrete wall W as shown in FIG. The reinforcing frame 2 is fixed to the column Y, and the reinforcing frames 3 and 3a are fixed to the pair of beams X and Xa located at the upper and lower portions of the existing concrete wall W, as in the longitudinal sectional views of FIGS. In this case, since the other ends of the horizontal reinforcing bars 4, 4a ... are not fixed, the vertical horizontal reinforcing bars 4, 4a ... 5, 5a ... are fixed to the connecting anchors 6, 6a ..., or the vertical reinforcing bars 4, 4a ... It is indispensable to bind or weld the intersections of 5 ... 5a ....

6 is substantially the same as the method described in paragraph [0011], but in the step (1), one side of the existing concrete wall W and upper and lower Reinforcement frames 2, 3, 3a are fixed to one column Y and two beams X, Xa located in the section, and one end of the reinforcing bars 4, 4a,. Only the portion is fixed to the reinforcing frame 2.

It is a cross-sectional view of the increased striking wall structure according to the present invention. It is a longitudinal cross-sectional view of the additional striking wall structure of FIG. It is a cross-sectional view of another embodiment of the increased striking wall structure. It is a longitudinal cross-sectional view of the additional striking wall structure of FIG. It is a longitudinal cross-sectional view of the additional striking wall structure which has the reinforcement frame which provided the protrusion. It is a cross-sectional view of the increased striking wall structure of the sleeve wall. It is a cross-sectional view of a conventional additional striking wall structure.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 1a ... Anchor 2, 2a, 3, 3a Reinforcement frame 4, 4a ... 5, 5a ... Vertical and horizontal reinforcement 6, 6a ... Connection anchor 7 Mortar W Existing concrete wall X, Xa Beam Y, Ya Column

Claims (3)

A step of driving a plurality of anchors into each of the columns and beams located on the outer peripheral portion of the existing concrete wall to be reinforced, and fixing each of the splitting prevention reinforcing frames arranged in parallel to the columns and beams into which the anchors are driven with the anchors. When a step of implanting a plurality linking anchors the existing concrete wall, a step of welding secure the ends of the plurality of vertical and horizontal reinforcing bars and reinforcement in Wari裂prevent reinforcing inner frame to Wari裂preventing the reinforcing frame, said connecting anchor A method for increasing the wall thickness of an existing concrete wall, comprising a step of embedding a reinforcing frame for preventing splitting and vertical and horizontal reinforcing bars with mortar or the like. And a plurality of anchors driven into s posts and beams husband positioned on the outer peripheral portion of the existing concrete wall be reinforced, for Wari裂prevention that is anchored arranged in parallel to the column the anchor has been driven and the beams a reinforcing frame, and a plurality connecting anchor implanted into the existing concrete wall, and a plurality of vertical and horizontal reinforcing bars, which are welded the ends to Wari裂preventing the reinforcing frame as well as distribution muscle in Wari裂prevent reinforcing inner frame, the An increased concrete wall structure for an existing concrete wall, which is constituted by a protruding end portion of a connection anchor, a reinforcing frame for preventing splitting, and a mortar in which vertical and horizontal reinforcing bars are embedded. 3. An existing concrete wall-added wall structure according to claim 2, wherein the existing concrete wall and the side surfaces of the pillar and beam side of the reinforcing frame for preventing splitting are uneven.

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