JPH0819727B2 - Hole filling method for concrete slabs - Google Patents

Description

Detailed Description of the Invention

[0001]

[Industrial application] In slabs of concrete buildings, one hole is provided between beams for piping and wiring. If the hole is not required for the time being, the concrete slab is filled with concrete after the construction of the concrete slab and closed. Further, when the flooring material is temporarily supported by H steel or the like, holes cannot be formed in the H steel corresponding portion because concrete cannot be placed when the slab is formed. Therefore, the holes must be closed after the slab construction. The present invention relates to a method for filling unnecessary holes (useless holes) as described above formed in a concrete slab with concrete to close the holes.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 10, a veneer plate 21 serving as a formwork is attached to the lower side of a hole 2 of a concrete slab 1, and the pipe 22 and the upper side of the hole 2 are arranged along the lower side. The wire 24 is wound between the pipe 23 and the pipe 23, and the veneer 21 is pressed against the lower surface of the slab 1.
Concrete is poured into the concrete, and after hardening, both the upper and lower sides of the wire 24 are cut to remove the upper and lower pipes 22 and 23.

[0003]

In the above-mentioned conventional method, since the pipes are arranged above and below the hole, the wire must be wound while being supported from the lower side of the slab when mounting the formwork. Instead, it took time to install the formwork. Also, the upper and lower pipes had to be removed after the concrete had hardened, and the work on the lower side of the slab was required as at the time of installation. Further, when the position of the lower surface of the slab is high, it is necessary for the worker to go up and work on the ladder.

[0004]

According to the present invention, a mold having a wire insertion portion is attached to the lower side of a hole formed in a concrete slab, and a hanging rod is hung on the upper side of the hole to wire the wire in the mold. After inserting the hanging rod and the formwork with a wire while inserting the formwork through the insertion part of the frame and placing the formwork by pressing the formwork against the lower surface of the concrete slab, concrete is placed in the hole and the concrete The conventional problem is solved by cutting the wire after curing and removing the suspension rod. If the mold used has a structure in which two iron plates are connected by a hinge, the mold will pass through the hole and the lower side of the slab even if the minimum size of the mold is larger than the maximum size of the hole. Can be inserted into.

[0005]

In the present invention, the wire is previously inserted into the wire insertion portion of the form, the form is passed through the hole from above and attached to the lower side of the hole, and then the wire is wound around the hanging rod. Thus, all the work of installing the formwork can be performed from the upper side of the slab. Also, since the formwork can be buried as it is after the concrete has hardened, it is not necessary to remove the formwork, only the pipes arranged on the upper side need to be removed. Work is unnecessary.

[0006]

1 is a cross-sectional view showing an installed state of a formwork of the present invention, in which an iron plate formwork 3 is attached below a hole 2 of a concrete slab 1, and The wire 4 is inserted through the formed wire insertion hole 3a. Then, a pier 5 is arranged near the upper surface hole portion 2 of the concrete slab 1, and a hanging rod 6 made of a pipe is hung between the piers 5,
The wire 4 is wound around a suspension rod 6 and pulled by the wire 4 so that the peripheral edge of the form 2 is pressed against the concrete slab 1. Reference numeral 7 in the figure is a reinforcing bar.

The procedure for installing the formwork as described above is as follows. It should be noted that all of these operations are performed on the upper side of the concrete slab 1. First, the wire insertion hole 3a of the mold 3
The wire 4 is inserted through the wire 4, the wire 4 is wound around the hanging rod 6, and both ends of the wire are temporarily fixed. Next, the formwork 3 is passed from the upper side of the concrete slab 1 through the hole 2 and attached to the lower side of the hole 2 to close the hole 2, and then the pier 5 is placed in the vicinity of the hole 2 of the concrete slab 1. The hanging rod 6 is hung between the piers 5. After that, the temporary fixing portion of the wire 4 is further tightened to lift the form 3, and the form 3 is pressed against the lower surface of the slab 1. After arranging the formwork 3 on the lower side of the slab 1,
The wire 4 may be wound around the hanging rod 6.

After installing the formwork in this way, the hole 2
Concrete 8 is cast on the concrete, and after the concrete hardens, the portion of the wire 4 protruding above the slab is cut, and the hanging rod 6 and the splint 5 are removed.

4 to 8 show an example of the mold 3 used in the present invention. In the mold 3 of FIG. 4, a plurality of protrusions 11 are formed on the upper surface of the iron plate 10 by press working, and the wire insertion holes 3a are formed on the inclined surfaces of the protrusions 11. By forming the hole 3a on the inclined surface in this way, it is possible to reduce the leakage of the poured concrete as much as possible. Form 3 of FIG.
Is the one in which the wire insertion hole 3a is provided in the flat portion without forming the convex portion on the iron plate 10.

The formwork of FIG. 6 has a hanging member 1 on the upper surface of an iron plate 10.
2 is fixed, and the truss 13 is hung on this suspension material. The wire 4 is wound between the suspension material 12 or the truss 13 and the suspension rod. Since the formwork 3 has the truss 13, it is not necessary to dispose the reinforcing bar 7. The truss 13 does not have to be suspended. The formwork of FIG. 7 is an iron plate 10.
An inverted U-shaped metal piece 14 is fixed to the upper surface of the wire 4, and the wire 4 is wound between the metal piece 14 and the hanging rod 6.

FIGS. 8 and 9 show a mold 3 used for carrying out the invention of claim 2, which is a circular and foldable structure in which half-moon shaped iron plates 10a and 10b are connected via a hinge 15. Is. Although the drawing shows the structure in which the wire insertion hole 3a is formed in the convex portion similarly to the mold of FIG. 4, the structure of the wire insertion portion shown in FIGS. 5 to 7 can be appropriately used. . If this form is used, even if the minimum size of the form is larger than the maximum size of the hole 2 shown by the chain line in FIG.
By folding, the hole 2 can be passed, and the work from the upper side of the slab is possible. Further, since it is circular, it has no directionality, and it is not necessary to consider the orientation of the formwork during work. Furthermore, if the ribs 16 are formed by bending the peripheral portion, the finished state is beautiful, and even when the interior material is not stretched, it looks like a simple cover.

[0012]

According to the present invention, the wire is previously inserted into the wire insertion portion of the mold, the mold is passed through the hole from above to be attached to the lower side of the hole, and then the wire is suspended by the wire. By tying the mold and the formwork together, the formwork can be brought into pressure contact with the lower side of the slab only by the work on the upper side of the slab, and the work of installing the formwork can be performed from the upper side of the slab. Further, since the formwork can be left as it is after the concrete is hardened, it is not necessary to remove the formwork. Since the pipe arranged on the upper side of the wire can be removed by cutting the upper side of the wire, the work of dismantling the formwork can be performed only by the work on the upper side of the slab. Therefore,
Work under the slab is unnecessary and workability is improved. Further, since the position of the hole can be easily detected by the presence of the buried mold, the hole can be disassembled without error when the need for piping or the like arises at a later date.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a mold installation state in an embodiment of the present invention.

FIG. 2 is a side sectional view showing the process of installing the formwork as well.

FIG. 3 is a sectional view showing a state after the mold is disassembled.

FIG. 4 is a partially enlarged cross-sectional view of the form likewise.

FIG. 5 is a partially enlarged cross-sectional view of a mold in which a wire insertion hole is also formed directly.

FIG. 6 is a perspective view of a form frame to which suspension materials are also fixed.

FIG. 7 is a perspective view of a frame to which a U-shaped metal piece is also fixed.

FIG. 8 is a plan view of a mold frame that is also foldable.

FIG. 9 is a sectional view of the same.

FIG. 10 is a sectional view of a conventional example.

[Explanation of symbols]

 1 concrete slab 2 hole 3 formwork 3a wire insertion hole 4 wire 5 splint 6 suspension rod

Claims (2)

[Claims] 1. A formwork having a wire insertion part is attached to a lower side of a hole formed in a concrete slab, a suspension rod is hung over the hole side, and a wire is inserted into the insertion part of the formwork. After the hanging rod and the formwork are bound with a wire and the formwork is pressed against the lower surface of the concrete slab, concrete is placed in the hole, and after the concrete hardens, the wire is cut to remove the hanging rod. Method for filling holes in concrete slabs characterized by 2. The method of filling holes in a concrete slab according to claim 1, wherein the formwork has a structure in which two iron plates are connected by a hinge.