JP2891113B2 - Installation method of reinforced concrete shear walls - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method for installing a reinforced concrete-made earthquake-resistant wall in an opening after a column, a beam, and a floor are provided by providing an opening for carrying in a material. When installing a reinforced concrete shear wall in an opening where pillars, beams, and floors have been constructed earlier, a reinforced concrete shear wall will be installed in a place where there was no existing shear wall in connection with the repair work on the reinforced concrete structure. The present invention relates to a method of installing a reinforced concrete-made earthquake-resistant wall in an opening in which reinforced concrete or steel-frame columns, beams, and floors have already been built around four circumferences.

[0002]

2. Description of the Related Art The following method is generally employed as a method for installing a reinforced concrete earthquake-resistant wall in such an opening. (Refer to Fig. 2) (1) Driving post-installed anchors with reinforcing bars on the existing pillars, beams and floor around the opening (If the mounting hardware is already buried in the existing columns, beams and floor, install it The rebar is projected toward the center of the opening (with the rebar attached to the hardware), and the rebar is tied to this rebar and arranged vertically and horizontally. (2) The formwork is erected on both sides of the reinforced bar. The top of the formwork on one side is enlarged and concrete is poured from this top.
(3) After the concrete is hardened, the mold is removed and the protruding concrete on the top is removed.

[0003]

According to the conventional method of installing a seismic wall, (1) building and removing a formwork; (2) securing a scaffold for placing concrete from the top of the formwork; and (3) concrete pouring. It requires a lot of work, such as treating excess water that flows to the floor at the time of construction and (4) removing the concrete that is protruding from the top. In addition, problems have been pointed out, such as the occurrence of noise during the work of concrete removal.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems relating to the conventional method of installing a seismic wall. (1) Building and removing a formwork (2) Surplus flowing out to the floor Water treatment (3) Providing a method of installing a seismic wall, which eliminates work such as stripping of projecting concrete and can simplify the work scaffolding, and solves the problems of the conventional method at once. Things.

That is, the present invention relates to (A) a steel plate is erected in a vertical opening, the top of the steel plate is fixed below the beam, the bottom of the steel plate is fixed to the floor, and the center of the vertical earthquake-resistant wall is fixed. Operation to form,
(B) On each side of the central part of the earthquake-resistant wall, the surrounding existing columns,
A plurality of rebars, one end of which is fixed to the existing beam and the existing floor, the other end of which extends parallel to the surface of the steel plate and the other end is welded to the surface of the steel plate, and the other end of which protrudes vertically from the surface of the steel plate (C) Fixing a plurality of welding wire meshes to the spacers and arranging reinforcing bars on both sides of the center of the earthquake-resistant wall in parallel with the surface of the shape steel plate. (D) Embedding the welding wire meshes and spacers. Then, the mortar is sprayed from the side of the welded wire mesh to drive the mortar.

The gist of the present invention is that the central part of the wall is formed by a mold steel plate panel, and the main body of the wall is formed by spraying mortar. Is that a welded wire mesh composed of a steel rod having a smaller diameter than a reinforcing bar used in the method according to the above method is used as a reinforcing bar.

In the present invention, as the steel plate forming the central portion of the earthquake-resistant wall, a molded steel plate is used from the viewpoint of securing rigidity in the vertical direction and facilitating fixing to beams and floors. This type steel sheet may be a normal groove type or a corrugated type, but a groove type between two flat steel plates,
Sandwich type steel sheets welded to each other with a corrugated type steel sheet interposed therebetween are preferred.

In the present invention, about 2 to 4 welded metal meshes are used depending on the thickness of the mortar wall to be formed.
The thickness of the mortar is usually about 150 to 250 mm, and the thickness of the mortar sprayed at one time, the roughness of the welding wire mesh suitable for spraying the mortar, the diameter of a steel rod constituting the welding wire mesh, and the like are taken into consideration. Usually, a plurality of welding wire meshes are arranged in parallel on both sides of the sandwich-type steel plate at intervals of several tens of mm.

[0009] When arranging a welded wire mesh, mortar may be sprayed and driven at a time with a plurality of welded wire meshes arranged, but there is a limit to the sprayed thickness of the mortar at one time. It is not preferable to make it too thick,
It is preferable to repeat the arrangement of the reinforcing bar and the spraying of the mortar several times.

The operations (A) to (D) in the present invention do not necessarily mean that it is necessary to perform the operations in the order of (A) to (D) in terms of time. In order to clearly explain the content of the invention, various operations are described in four parts. For example, (1) a large number of spacers are vertically welded to both sides of a type steel sheet, and two pieces of each of the spacers are fixed to the spacers, and a work of fixing a total of four welded metal meshes is performed at a place other than the site, and manufactured. Carry the composite member to the site and build it. (2) A composite member manufactured by welding a large number of spacers vertically on both sides of a mold steel plate and fixing a total of two welded metal meshes to each of the spacers at a place other than the site. Is carried to the site and built, and the operation of installing a plurality of rebars in the operation of (B) and the spraying of mortar in (D) are performed, and then one piece is placed on each of the spacers protruding from both surfaces of the mortar. , Work to fix two welded wire meshes on site
Arrange the second welding wire mesh on site. Such a method is an example of the method of the present invention. As a matter of course, it is preferable to promote the use of composite members as far as possible without hindering construction on site.

[0011] The earthquake-resistant wall formed by the present invention is sufficiently high in quality comparable to the earthquake-resistant wall formed by casting concrete, but if mortar is mixed with reinforcing fibers, it is of higher quality than concrete wall. Creating a wall is easy.

[0012]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1A and 1B show an embodiment of the method of the present invention. FIG. 1A is a longitudinal sectional view of one embodiment, and FIG. 1B is a longitudinal sectional view of another embodiment. (Incidentally, the illustration of the mortar sprayed is omitted for simplicity.) In this embodiment, two welding wire meshes are arranged on both sides of the mold steel plate, respectively, and the mortar is sprayed twice each. went. In the following description, the first welded mesh is referred to as “inner welded mesh”, and the second welded mesh is referred to as “outer welded mesh”. In addition, a sandwich-type steel sheet obtained by welding a groove-type steel sheet between two flat steel sheets was used as the type steel sheet.

First, the construction procedure in the case (a) will be described.

(1) The ends of a number of spacers 7 are welded to both surfaces of the mold steel plate 1 at a predetermined interval, and the inner welding meshes 5 and 5 are bound to the spacers 7 and Bars are arranged in parallel.
5, a panel having a bottom end to which a channel steel 16 is welded is erected at the opening, and the top end of the shape steel plate 1 is fixed to the existing beam 2 via the angle steel 15 and the post-installed anchor 9; 1
At the bottom end, glue the channel steel 16 to the existing floor 3 and fix it.
Form a vertical central part of the shear wall. The tip of the spacer 7 may be left as it is, but it is preferable to cover the tip with a plastic cap 17 in order to prevent rusting after construction.

(2) Post-installed anchors 8 with reinforcing bars at existing columns, existing beams 2 and existing floor 3 around the shaped steel sheet 1 at appropriate intervals.
(The post-installed anchor with rebar means that the rebar 4 protrudes considerably longer than a normal post-installed anchor). Let it. (3) Inner welding wire mesh 5,5
Spray mortar from the surface. Spraying is interrupted from time to time to hold the mortar, and the mortar is sprayed until the inner welding meshes 5, 5 are completely buried and the exposed length of the spacer 7 becomes a predetermined length. Hold the mortar well.

(4) The outer welding meshes 6 and 6 are applied to the surface of the pressed mortar, and the outer welding meshes 6 and 6 are bound or welded to the projecting spacers 7 and fixed. , 6 and the inner wire meshes 5, 5 are arranged vertically so as to have a predetermined value.

(5) Mortar is sprayed from the surfaces of the outer welded metal meshes 6,6. The outer welding wire meshes 6, 6 are completely buried while holding the mortar by stopping the spraying from time to time, and the plastic cap 17 at the tip of the spacer 7 is provided.
Spray mortar until the glow disappears. It is confirmed that the mortar has been sufficiently sprayed to the predetermined mortar surface 13 by holding down the mortar, and the construction is completed.

In the above-mentioned construction example, the panels already attached to the inner welding meshes 5 and 5 were erected before the mold steel plate 1 was erected, but only the mold steel plate 1 was erected and the spacer 7 and the inner welder were welded on site. Wire meshes 5 and 5 may be attached.
(B) is different from (a) only in that the existing beam 2 is made of steel. Therefore, only the method of fixing the mold steel plate 1 and the reinforcing bar 4 to the existing beam 2 is slightly different, and the other is the same as (a). In the case of (b), since the existing beam 2 can be welded with a steel frame, the angle steel 15 at the top end of the shaped steel plate 1 is fixed to the existing beam 2 by welding, and the end of the reinforcing bar 4 is also fixed to the existing beam 2 by welding. Have been.

[0020]

【The invention's effect】

(1) Installation and removal of formwork (2) Treatment of surplus water flowing to the floor (3) Elimination of extra concrete work such as stripping, and a simple scaffold for human work As a result, not only the amount of work is significantly reduced, but also the noise caused by the picking can be completely eliminated.

[Brief description of the drawings]

FIG. 1 shows an embodiment of the method of the present invention (a).
FIG. 6 is a longitudinal sectional view of one embodiment, and FIG. 6B is a longitudinal sectional view of another embodiment. (Note that, for simplicity, the illustration of the sprayed mortar is omitted.)

FIG. 2 shows an example of a conventional method, in which (a) and (b) show the case where the existing columns, beams and existing floors are all made of reinforced concrete, (a) is a longitudinal sectional view, and (b) is a transverse view. FIG. (C) is a longitudinal sectional view when the existing pillars and the existing floor are made of reinforced concrete and the existing beams are made of steel.

[Explanation of symbols]

1 .... Steel steel, 2 .... Existing beam, 3 .... Existing floor, 4 .... Reinforcing bar, 5 ... Inner welding wire mesh, 6 ... Outer welding wire mesh, 7
··· Spacer, 8 ··· Post-installed anchor, 9 ··· Post-installed anchor, 10 ··· Formwork, 11 ··· Formwork enlarged part, 12
・ Existing pillar, 13 ・ ・ Mortar surface at the end of construction, 14.
・ Reinforcing bar, 15 ・ ・ Angle steel, 16 ・ ・ Groove, 17 ・ ・ Plastic cap.

Claims (2)

(57) [Claims] (A) An operation of forming a vertical steel plate in a vertical opening, fixing a steel plate in a vertical opening, fixing a top of the steel plate below a beam, and fixing a bottom of the steel plate to a floor, (B) A plurality of rebars, one end of which is fixed to the existing pillars, existing beams, and the existing floor, and the other end extends in parallel with the surface of the steel plate, and one end of the steel plate surface, Welded to
An operation of installing a plurality of spacers, the other ends of which project perpendicularly from the surface of the steel sheet. (C) Fixing a plurality of welding wire meshes to the spacers and arranging reinforcing bars on both sides of the center of the earthquake-resistant wall in parallel with the surface of the steel sheet. (D) A method of installing a reinforced concrete earthquake-resistant wall, which comprises: blasting mortar from the side of the welded wire mesh so as to bury the welded wire mesh and spacer. 2. A method of arranging a plurality of welding wire meshes in a plurality of times and arranging reinforcing bars for each piece, and dividing the mortar into a plurality of times so as to bury the welding wire meshes arranged in each one of the reinforcing wires. 2. The method for installing a reinforced concrete earthquake-resistant wall according to claim 1, wherein the installation is performed by spraying.