JPH10115032A - Slit structure for joint of reinforced concrete made column wall - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an earthquake-resistant wall and a slit structure of good appearance provided between the walls with regard to a reinforced concrete column wall joint. SOLUTION: A box extraction member 10 is fixed by an anchor stripe on the wall side in the joint position between a reinforced concrete column 1 and a wall 5 in approximately the central position in the wall thick direction so that a hollow slit is formed inside the wall 5. Cut-off over plates 21, 22 are fixed in the interior of a wall 5 so that their surfaces may expose to the wall surface in which the hollow slit is to be formed and, by placing concrete on the reinforced concrete column 1 and the wall 5 and inlaying the box extraction member 10 and the cut-off cover plates 21, 22 in the interior of the wall 5, the hollow slit is formed in the position where the cut-off plates 21, 22 are embedded.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reinforced concrete column wall joint or a slit structure between a steel reinforced concrete column and a reinforced concrete wall joint.
The present invention relates to a slit structure of a reinforced concrete column wall joint provided on a wall side of a joint between a sleeve wall or the like and a structural framework such as a column.

[0002]

2. Description of the Related Art A waist wall, a sleeve wall, and the like, which are frequently used in reinforced concrete construction, are not handled as earthquake-resistant walls in an earthquake-resistant design. For this reason, it is required not to promote the shear fracture of the columns and the like even when they are joined to the columns and the beams, and generally, a slit structure is provided at the joint with the columns and the like. Hereinafter, waist walls, sleeve walls, and the like that are not used as earthquake-resistant elements are referred to as miscellaneous walls in this specification.

FIG. 7 shows a reinforced concrete column 50 and a miscellaneous wall 5.
FIG. 5 is a plan sectional view showing a slit 52 provided at a joint portion with the fifth embodiment. The slit 52 shown in FIG.
It is classified as a partial slit type. FIG. 1A shows a one-side slit type, and FIG. 1B shows a two-side slit type. In any case, in the case of the partial slit type, a boxless formwork (not shown) is set on the wall 55 side of the column wall joint, and the cross section of about half of the wall thickness at the end of the wall is deleted. A part 53 and a slit 52 are formed. Further, in order to ensure waterproofness of the slit 52, the formed recess is filled with a known sealing material 54.
In addition, it is necessary to ensure the seismic stability of the wall itself as a miscellaneous wall. Therefore, between the wall 55 and the column 50, a fixing bar 56 of a predetermined reinforcing bar amount is arranged.

[0004]

By the way, in the conventional partial slit, a recess corresponding to the slit is provided by fixing the box-extracted portion on the inner surface of the mold, so that the slit always appears on the wall surface and the hollow inside the wall. No slit could be formed. As a result, there is a disadvantage that the sealing work of the wall-column joint is required, and the work of finishing the recesses remaining in the corners is troublesome. Further, since the wall thickness of the joint portion of the slit changes suddenly, cracks due to drying shrinkage are likely to occur. For this reason, there is also a problem that cracks are exposed on the surface and deterioration of concrete is promoted.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a slit structure of a reinforced concrete column wall joint which solves the above-mentioned problems of the prior art, has a good appearance, and can eliminate finishing work.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention is directed to forming a hollow slit in a mixed wall at a joint position between a reinforced concrete column and a mixed wall. At the same time, the box-opening member is fixed at a substantially central position in the wall thickness direction by fixing means, and the water-stop cover plate is fixed to the wall such that the surface is exposed on the wall surface in which the hollow slit is formed, Concrete is poured into the reinforced concrete pillar and the miscellaneous wall, and the box punching member and the waterproof cover plate are buried in the miscellaneous wall to form a hollow slit at the position. It is preferable that the water stop cover plate is a synthetic rubber molded product.

In another aspect of the present invention, a precast concrete member having a slit formed in advance and a box-opening member for closing the slit are provided on the side of the joining wall between the reinforced concrete column and the joining wall in the wall thickness direction. Is fixed at a substantially central position by fixing means, concrete is poured into the reinforced concrete columns and the miscellaneous walls, and the reinforced concrete columns and the miscellaneous walls are connected to each other via the precast concrete material. It is characterized in that the slit is located. At this time, it is preferable that the precast concrete material has a polygonal column shape having a recess formed on at least one side in plan view.

[0008] In any of the above cases, the box removing member is
It is preferable to use a foamed resin molded product.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, one embodiment of a slit structure of a reinforced concrete column wall joint of the present invention will be described.
This will be described with reference to the accompanying drawings. FIG. 1 is an exploded perspective view showing a box cutting member 10 buried in concrete to provide a slit in a sleeve wall as a miscellaneous wall according to the present embodiment, and cover plates 21 and 22 as water stopping means on the wall surface. FIG. FIG. 2 shows a case where a box-extracting member 10 attached to a reinforcing bar of a pillar 1 and a first cover plate 21 and a second cover plate 22 fixed at predetermined positions in a wall are attached to form a slit. It is the schematic plan view which showed the state. Although the second cover plate 22 is used in a state temporarily fixed to the inner surface of the corner forming form as described later, the illustration of the corner forming form is omitted in FIG.

As shown in FIG. 1 and FIG.
Numeral 0 is a solid prism having a height from the floor slab 2 to the bottom of the beam (not shown). The solid prism is buried in the concrete at the time of placing the concrete, and forms a column-shaped hollow slit 7 in the rough wall 5. As shown in FIG. 2, the plane dimension is set such that the length in the wall direction becomes the slit width w, and the wall thickness in the wall thickness direction (ts1 + ts2 <7 cm) with respect to the wall thickness tw is １ ／ or less. Have been. In the present embodiment, a foamed polystyrene resin material is used, but a solid foamed plastic material having a hardness not to be deformed by the lateral pressure immediately after casting concrete, such as a hard foamed polyurethane resin, may be appropriately used. it can. It is also possible to use a so-called void form such as a plastic plate-like product bent into a hollow rectangular tube, or water-resistant cardboard. In other words, various materials can be used as long as they are prismatic or rectangular cylindrical bodies having low shear rigidity against horizontal force.

At a predetermined position of the box removing member 10, a through hole 11 through which an anchor bar 15 can be inserted is provided. Anchor bars 15 with hooks are inserted through the through holes 11 and are fixed to the column bars 3 via the auxiliary bars 4 in the columns 1 as shown in FIGS. At this time, the box removing member 10 is
0a coincides with the outer shape position of the pillar, and is fixed in a state where the wall thickness (ts1, ts2) of the predetermined joint portion 6 is secured on both sides in the wall. The lower end 10d of the box removing member 10 is supported by a leg fixing device 25 (see FIG. 1). The leg fixing device 25 is composed of two jigs having the same shape.
0 to support the lower end 10d. In addition,
It is preferable that the leg fixing device 25 be fixed in advance to the floor slab 2 with a concrete nail or the like (not shown) so as to face a square shape in which the cross section of the box removing member 10 can be fitted. If the lower end 10d of the box removing member 10 is fitted in this portion, positioning and erection can be easily performed. Note that the leg fixing member 25 can be made of various materials such as hardware, resin products, and ceramic products.

Next, the configuration of a cover plate that covers the wall portion of the slit 7 will be described with reference to FIGS. The cover plates 21 and 22 are synthetic rubber molded products having excellent alkali resistance and capable of predetermined elastic expansion and contraction. The first cover plate 21 includes a wall plate 21 a that covers the wall surface of the joint 6 from the floor slab 2 to a position below the beam (not shown).
Fixed flange 21b integrally formed on the inner surface of 1a
And a water stop projection 2 extending along the vertical direction near the end.
1c. Of these, four fixed plates 21d extend vertically from the fixed flange 21b, as shown in FIG. The front end of the fixing plate 21d is fixed to the side surface 10a of the box removing member 10. In the present embodiment, the length of the fixed plate 21d is such that the wall plate 21a has a wall thickness t of the joint 6.
The distance is set to be equal to s1 (see FIG. 2).

A water stop projection 21c extends from a portion embedded in the concrete on the inner surface side of the wall plate 21a.
Since the joint portion 6 covered with the cover plates 21 and 22 has a sudden change in wall thickness, shrinkage cracking due to drying shrinkage of concrete is likely to be induced. At this time, since the water blocking projection 21c is embedded in the concrete, the cover plate 2
By covering the portion where the shrinkage cracks occur with the portions 1 and 22, the crack occurrence portions can be prevented from being exposed to the air.

As shown in FIGS. 1 and 3, the planar shape of the second cover plate 22 is a substantially T-shape in which a wall plate 22a and a column plate 22b following the corner of the column 1 are connected. .
Since the second cover plate 22 is set at a predetermined position when the formwork 8 is attached, it is preferable that the second cover plate 22 be bonded to the concrete surface of the formwork 8 in advance. In addition, the water blocking projection 22c is formed for the same purpose.

FIG. 3 is a partially enlarged view showing a state where the formwork 8 is attached to the column wall joint. As shown in FIG.
When concrete is poured into the concrete, part of the concrete goes around to the joint 6 in the wall 5. Further, when concrete is poured into the wall 5, concrete wraps around the joint 5 from the wall 5 side, and the joint 6 is completely filled with concrete. The fixing plate 2 of the first cover plate 21
The wall thickness of the joint portion 6 is maintained at ts1 and ts2 (see FIG. 2) by 1d and the like, however, a smaller spacer block may be interposed between the cover plate and the box removing member 10. .

FIG. 4 is a plan sectional view showing a state in which the formwork 8 has been removed after the concrete placement of the columns 1 and the walls 5 has been completed. Although the box-piercing member 10 remains buried at the end of the wall, the shearing rigidity of the box-piercing member 10 in the horizontal direction is very small, so that the deformation behavior is almost the same as that when the hollow member is used when a horizontal load such as an earthquake is applied. Can be shown.

FIG. 5 is a partial perspective view showing a precast slit member 30 and a box emptying member 32 according to another embodiment. First, the configuration of the precast slit member 30 will be described. This precast slit member 3
Reference numeral 0 denotes a precast concrete product in which a recess 30c is formed on one side in plan view and the plane shape is substantially U-shaped. In the present embodiment, the precast slit member 30
Are two opposing sides 3 which become joint portions 36 (see FIG. 6A).
0a, 30a and the two sides 30a, 30a,
And one side 30b that constitutes a part of. An anchor bar 31 for fixing to a column reinforcing bar (not shown) is attached to the wife surface of the joint 36. Further, a box emptying member 32 equivalent to that shown in FIG. 1 is fitted into the recess 30c forming the slit after the concrete is cast, and is closed so that concrete does not enter at the time of concrete casting. With the above configuration, in the construction of the column wall joint, as shown in FIG. 6A, the slits and joints 36 completed before the column and the wall concrete are cast.
Can be assembled.

As shown in FIG. 5, a roughened surface 33 having a large number of fine recesses is formed on a side surface 30b of the precast slit member 30 which is in contact with the wall 5. When the precast slit member 30 is used, the column 1 and the wall 5 are separated by this, and the cast-in-place concrete is to be separately cast into the column 1 and the wall 5. The wall 5 and the precast slit member 30 are roughened by the anchor streaks 31.
3 can be integrated. FIGS. 6B and 6C
Shows a modified example of the precast slit member 30. FIG. 3B shows a precast slit member 30 having a trapezoidal planar shape of the box punching member 32. FIG. 3C shows a precast slit member 30 in which a cotter 35 is formed instead of the roughened surface 33. The cotter 35 integrates with the wall. According to this embodiment, since the joint portions 36 are preliminarily formed by the precast slit members 30, there is an effect that labor for assembling work at the column wall joint portion is eliminated.

[0019]

As is apparent from the above description, according to the present invention, an advantageous effect is obtained in that a good-looking slit can be easily formed at the column wall joint.

[Brief description of the drawings]

FIG. 1 is a perspective view showing one embodiment of a member for constituting a slit structure of a reinforced concrete column wall joint according to the present invention.

FIG. 2 is a plan view showing a state in which a member for constituting the slit structure shown in FIG. 1 is fixed to a column reinforcing bar.

FIG. 3 is an enlarged plan sectional view showing a slit structure of a column wall joint.

FIG. 4 is a partial plan sectional view showing a state in which concrete is poured into the slit structure shown in FIG. 2;

FIG. 5 is a partial perspective view showing one embodiment of the invention using a precast concrete member for the slit structure.

FIG. 6 is a plan view showing a state in which the precast concrete member shown in FIG. 5 is fixed to a column reinforcing bar.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Reinforced concrete pillar (pillar) 2 Floor slab 5 Miscellaneous wall (wall) 6,36 Joint part 7,37 Slit 8 Formwork 10,32 Box removal member 15,31 Anchor bar 21,22 Cover plate 25 Leg fixing device 30 Precast slit member

[Procedure amendment]

[Submission date] December 10, 1996

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Brief description of drawings

[Correction method] Change

[Correction contents]

[Brief description of the drawings]

FIG. 1 is a perspective view showing one embodiment of a member for constituting a slit structure of a reinforced concrete column wall joint according to the present invention.

FIG. 2 is a plan view showing a state in which a member for constituting the slit structure shown in FIG. 1 is fixed to a column reinforcing bar.

FIG. 3 is an enlarged plan sectional view showing a slit structure of a column wall joint.

FIG. 4 is a partial plan sectional view showing a state in which concrete is poured into the slit structure shown in FIG. 2;

FIG. 5 is a partial perspective view showing one embodiment of the invention using a precast concrete member for the slit structure.

FIG. 6 is a plan view showing a state in which the precast concrete member shown in FIG. 5 is fixed to a column reinforcing bar.

FIG. 7 is a plan sectional view showing an example of a conventional joint between a reinforced concrete column and a miscellaneous wall.

[Description of Signs] 1 Reinforced concrete pillar (column) 2 Floor slab 5 Miscellaneous wall (wall) 6,36 Joint 7,37 Slit 8 Formwork 10,32 Box emptying member 15,31 Anchor bar 21,22 Cover plate 25 Leg Fixture 30 Precast Slit Member

Claims (5)

[Claims] 1. A box cutting member is fixed by means of fixing at a position substantially at the center in the wall thickness direction on a side of a joining wall between a reinforced concrete column and a joining wall, so as to form a hollow slit in the joining wall. Along with fixing, on the wall surface in which the hollow slit is formed, a water-stop cover plate is fixed in the wall so that the surface is exposed, and concrete is poured into the reinforced concrete columns and the rough wall, and A slit structure at a joint of a reinforced concrete column wall, wherein a boxed member and a water stop cover plate are buried in the miscellaneous wall to form a hollow slit at the position. 2. The slit structure of a reinforced concrete column wall joint according to claim 1, wherein the water stop cover plate is a synthetic rubber molded product. 3. A precast concrete material in which a slit is formed in advance and a box-cutting member for closing the slit are provided at a substantially central position in the wall thickness direction on the side of the joining wall between the reinforced concrete column and the joining wall. To the reinforced concrete pillars and the miscellaneous wall, and concrete is cast on the reinforced concrete pillars and the miscellaneous wall, and the reinforced concrete pillars and the miscellaneous wall are connected via the precast concrete material so that the hollow slit is located in the miscellaneous wall. The slit structure at the joint of the reinforced concrete column wall, which is characterized in that: 4. The slit structure of a reinforced concrete column wall joint according to claim 3, wherein the precast concrete material has a polygonal column shape having a recess formed on at least one side in plan view. 5. The slit structure for a reinforced concrete column wall joint according to claim 1, wherein the box-cutting member is a foamed resin molded product.