JP3500076B2 - Half PC board with piping hole forming member and piping hole - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a member suitable for forming a hole for piping in a half PC board (half precast board) used for construction of buildings, houses, bridges, etc., and piping using the member. The present invention relates to a half PC board with holes.

[0002]

2. Description of the Related Art A half PC board is a thin mold made of concrete produced at a factory, assembled like a normal form at a construction site, poured concrete, and integrated with the poured concrete. It constitutes a slab or the like. In the method of using this half-PC board, when burying piping such as a conduit tube inside a slab, etc., when manufacturing the half-PC board in a factory, it should be placed at a predetermined position at the design stage.
A piping hole of about 50 mmφ is formed.

As a method of manufacturing a half PC board having such a piping hole, as shown in FIG.
A void tube 2 made of cardboard is fixed to a predetermined position of a bed 1 for board production, and concrete is poured in this state to form a half PC board 3, and then the bed 1 and the half PC are formed.
The plate 3 is separated, the void pipe 2 is removed, and the pipe hole 4
Is generally used. In addition, a dedicated jig may be used instead of the void tube.

FIG. 10 shows an example of a usage state of the half PC board 3 manufactured as described above. At the construction site, after assembling the half PC board 3 like a formwork, a pipe 5 such as a conduit is laid through a pipe hole 4. Piping hole 4 at this time
Since there is a gap between the pipe 5 and the pipe 5, the gap 6 is filled with a padding 6 such as a foamed plastic sheet. After that, if concrete 7 is placed on the half PC board 3, half PC
The plate 3 and the concrete 7 are integrated to form the slab 8 in which the pipe 5 is embedded.

[0005]

When the half-PC board is manufactured as shown in FIG. 9, since the half-PC board is usually provided with several piping holes, it is troublesome to remove the void pipe before shipping. Takes. Further, when the pipe hole is formed by a dedicated jig, it is necessary to make a tap on the bed to fix the jig to the bed, and it takes time and effort to fill the tap hole each time the bed is reused. Even if the tap holes are filled, unevenness is likely to remain on the bed surface, so a new bed must be replaced in a short cycle.

Further, at the construction site, it is necessary to fill the gaps between the pipe holes and the pipes of the half PC board with a filling material such as a foamed plastic sheet after the pipes have been laid, which is very troublesome. Further, due to variations in work, the stuffing may fall off and concrete may flow out, or the work of stuffing may be performed at a high place, which may result in a worker's fall accident.

Further, according to Japanese Patent Application Laid-Open No. 8-103906, it is also known that a cylindrical member is attached to a half PC plate to form a piping hole, but in the case of such a half PC plate with a piping hole, When embedding the pipe in the concrete to be placed above, it is still necessary to fill the space between the pipe hole and the pipe, and the same problem as described above occurs.

In view of the above problems, an object of the present invention is to improve the productivity of a half-PC board having a piping hole in a factory and to improve the workability at a construction site. It is to provide a hole forming member and a half PC board with a piping hole using the hole forming member.

[0009]

The pipe hole forming member of the present invention comprises a tubular body having a minimum inner diameter portion in a part in the axial direction and having an inner diameter larger than that of the minimum inner diameter portion. It is characterized in that the inner diameter of the inner diameter portion is set to a size such that there is substantially no gap between the inner diameter portion and the outer peripheral surface of the pipe passing therethrough.

This pipe hole forming member is to temporarily fix the half PC plate to a bed by means such as adhesion when manufacturing the half PC plate, and form the pipe hole integrally with the half PC plate.
Since it is not necessary to remove the half-PC board after manufacturing, the half-PC board can be manufactured easily and the productivity of the half-PC board is improved. Also, at the construction site, when piping is inserted through this member, there will be virtually no gap between the minimum inner diameter part and the outer peripheral surface of the pipe, so concrete should be poured without filling the pipe hole. Is possible. Also, since the minimum inner diameter part is provided in a part in the axial direction, and the inner diameter is larger than that part other than that part, it is possible to bend the pipe in the pipe hole forming member, and it is possible to comfortably pipe even in a narrow place. Bending can be installed. The pipe hole forming member of the present invention,
It is particularly suitable for forming a piping hole in a half PC board, but it can also be used when forming a piping hole in a thin concrete wall in addition to the half PC board.

The pipe hole forming member of the present invention has a minimum inner diameter portion at one end portion or an intermediate portion in the axial direction, and the inner diameter increases like a trumpet shape from the minimum inner diameter portion to the other end portion or both end portions. It is preferable that the minimum inner diameter portion is configured to have an inner diameter such that there is substantially no gap with the outer peripheral surface of the pipe passing therethrough. In this way, when the minimum inner diameter part is provided at one end, the other end becomes the maximum inner diameter, and when the minimum inner diameter part is provided at the middle part, one end or both ends become the maximum inner diameter.
Even in a narrow space, bent pipes can be installed more easily.

The pipe hole forming member of the present invention is a half P
It is preferable that a cap is placed on the end opposite to the one attached to the bed when molding the C plate. By covering such a cap, it is possible to prevent concrete from entering the pipe hole forming member at the time of manufacturing the half PC board.

The pipe hole forming member of the present invention preferably has a flange portion formed at one end. If such a flange portion is formed, this pipe hole forming member can be easily temporarily fixed to the bed by means such as adhesion.

Further, the half PC board with piping holes of the present invention is
The piping hole forming member as described above is attached to a required position of the half PC board to form the piping hole.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the drawings. [First Embodiment] FIG. 1 shows an embodiment of a pipe hole forming member according to the present invention. The pipe hole forming member 11 includes a tubular body 13 having a minimum inner diameter portion 12 at the lower end portion. The inner diameter of the cylindrical body 13 increases in a trumpet shape from the lower end to the upper end, and the upper end has the maximum inner diameter. The inner diameter D of the minimum inner diameter portion 12 is set to a size such that there is substantially no gap between the inner diameter D and the outer peripheral surface of the pipe passing therethrough. The height H (length in the axial direction) of the piping hole forming member 11 is set to be about 10 mm larger than the thickness of the half PC plate to be manufactured.

A rectangular flange portion 14 is provided at the lower end of the cylindrical body 13.
Are integrally formed. A concave portion 15 is formed at the center of two adjacent sides around the flange portion 14, and a convex portion 16 is formed at the center of the other two sides. These concave portions 15 and convex portions 16 are for facilitating the positioning of adjacent ones when a plurality of pipe hole forming members 11 are arranged side by side. Further, a projecting piece 17 having a hole is integrally formed at an intermediate portion in the vertical direction on the outer peripheral surface of the cylindrical body 13. The projecting piece 17 is for fixing the pipe hole forming member 11 to the rebar embedded in the half PC plate with a wire. A cap 18 is placed on the upper end of the pipe hole forming member 11.

FIG. 2 shows a method of manufacturing a half PC board with a piping hole by using the above-mentioned piping hole forming member 11. In this method, first, a reinforcing bar (not shown) for a half PC board is arranged on the bed 1, and a pipe hole forming member 11 is temporarily placed on the bed 1 at a position where a pipe hole should be formed in the half PC board. Fix it. The temporary fixing of the pipe hole forming member 11 can be easily performed by adhering the flange portion 14 onto the bed 1 via a double-sided adhesive tape (not shown). If necessary, insert a wire through the protruding piece 17 and fix it to the reinforcing bar.

Next, concrete is poured onto the bed 11 to mold the half PC board 3. At this time, the pipe hole forming member 11 is previously covered with a cap 18 so that concrete does not enter the pipe hole forming member 11. After the concrete is solidified, the half PC board 3 and the bed 1 are separated to obtain a half PC board 3A with a piping hole in which the piping hole forming member 11 and the half PC board 3 are integrated.

FIG. 3 shows a usage state of the half PC board 3A with piping holes manufactured in this way. After removing the cap 18, the half PC board 3A with piping holes that has been carried into the construction site (the cap 18 may be removed at the factory),
It is assembled as a form at a predetermined position. Then, the pipe 5 is laid through the hole in the pipe hole forming member 11. Since the inner diameter of the minimum inner diameter portion 12 at the lower end of the pipe hole forming member 11 is set to be substantially the same as the outer diameter of the pipe 5, it is necessary to provide a concrete leak preventer between the pipe hole and the pipe 5. Absent. Further, since the pipe hole forming member 11 has a trumpet shape in which the inner diameter increases toward the upper end,
On the upper surface side of the half PC board 3, the pipe 5 can be bent and installed without difficulty in a narrow space.

After the pipe 5 is laid, if the concrete is cast on the half PC plate 3, the half PC plate 3 and the concrete 7 are integrated to form the slab 8 in which the pipe 5 is embedded.

[Second Embodiment] FIG. 4 shows another embodiment of the pipe hole forming member according to the present invention. This piping hole forming member 11
Has a cylindrical body 13 having a minimum inner diameter portion 12 at the upper end thereof. The inner diameter of the cylindrical body 13 increases in a trumpet shape from the upper end to the lower end, and the lower end has the maximum inner diameter. The inner diameter of the minimum inner diameter portion 12 is set to such a size that there is substantially no gap between it and the outer peripheral surface of the pipe passing through it.
The height H of the pipe hole forming member 11 is the half P to be manufactured.
It is set about 10 mm larger than the thickness of C plate.

The lower end of the cylindrical body 13 has a straight shape (constant inner diameter), and the bottom lid 21 is fitted into the inside thereof. The bottom cover 21 is for fixing the pipe hole forming member 11 to the bed as described later.

A short cylinder portion 22 having an inner diameter larger than that of the minimum inner diameter portion 12 is provided at the upper end of the cylinder body 13. Inside the short cylinder portion 22, the upper end is a fixed end and the lower end is a free end. A large number of elastic pieces 23 are provided. An inward locking claw 24 is formed at the lower end of each elastic piece 23. These elastic pieces 23 suppress the free movement of the pipe by the locking claws 24 falling in the valleys of the outer peripheral surface of the pipe (corrugated pipe) inserted into the pipe hole forming member 11. Further, the short cylinder portion 22 is covered with the cap 18.

FIG. 5 shows a method of manufacturing a half PC board with piping holes by using the piping hole forming member 11 of FIG. In this method, first, a reinforcing bar (not shown) for a half PC board is arranged on the bed 1, and a pipe hole forming member 11 is temporarily placed on the bed 1 at a position where a pipe hole should be formed in the half PC board. Fix it. For temporarily fixing the pipe hole forming member 11, the bottom cover 21 fitted to the lower end of the pipe hole forming member 11 is attached to the bed 1 by a double-sided adhesive tape (not shown).
It can be easily performed by bonding via.

Next, the half PC board 3 is molded by pouring concrete onto the bed 11. At this time, the pipe hole forming member 11 is previously covered with a cap 18 so that concrete does not enter the pipe hole forming member 11. After the concrete is solidified, the half PC plate 3 and the bed 1 are separated from each other, so that the pipe hole forming member 11 and the half PC plate 3 can be integrated to obtain the half PC plate 3A with a pipe hole. Since the bottom lid 21 remains on the bed 1 side when the half PC board 3 and the bed 1 are separated, it takes time and effort to remove it later.

FIG. 6 shows a usage state of the half PC board 3A with piping holes manufactured in this way. After removing the cap 18, the half PC board 3A with piping holes that has been carried into the construction site (the cap 18 may be removed at the factory),
It is assembled as a form at a predetermined position. Then, the pipe 5 is laid through the hole in the pipe hole forming member 11. Since the inner diameter of the minimum inner diameter portion 12 at the upper end of the pipe hole forming member 11 is set to be substantially the same as the outer diameter of the pipe 5, it is necessary to provide a concrete leak preventive filling material between the pipe hole and the pipe 5. Absent. Further, since the pipe hole forming member 11 has a trumpet shape in which the inner diameter increases toward the lower end,
On the lower surface side of the half PC board 3, the pipe 5 can be bent and installed without difficulty even in a narrow space. Further, the pipe hole forming member 11 has a locking claw 24 of an elastic piece 23 provided inside the upper end portion.
Has a merit that the laid pipe 5 can be kept at a substantially fixed position because the pipe 5 falls into the valley portion of the outer peripheral surface to prevent the pipe 5 from moving, and the construction is easy.

After laying the pipe 5, if the concrete is cast on the half PC plate 3, the half PC plate 3 and the concrete 7 are integrated to form the slab 8 in which the pipe 5 is embedded.

[Third Embodiment] FIG. 7 shows still another embodiment of the pipe hole forming member according to the present invention. The pipe hole forming member 11 includes a cylindrical body 13 having a minimum inner diameter portion 12 at an intermediate portion in the axial direction. The cylindrical body 13 has a trumpet-like inner diameter that increases from the smallest inner diameter portion 12 to both ends, and the largest inner diameter at both ends or one end. The inner diameter of the minimum inner diameter portion 12 is set to such a size that there is substantially no gap between it and the outer peripheral surface of the pipe passing through it. The height H of the pipe hole forming member 11 is set to be about 10 mm larger than the thickness of the half PC plate to be manufactured.

A flange portion 14 is integrally formed at the lower end of the cylindrical body 13. The flange portion 14 is for fixing the pipe hole forming member 11 to the bed, as in the first embodiment. A cap 18 is placed on the upper end of the pipe hole forming member 11.

FIG. 8 shows a half PC board 3A with a piping hole using the piping hole forming member 11 of FIG. The method of manufacturing this half PC board 3A with a piping hole is the same as that of the first embodiment.
Further, the method of using the half PC board 3A with the piping hole is the same as that of the first embodiment, but the piping hole in this case is half P
Since there is a minimum inner diameter portion 12 in the middle of the C plate 3 in the thickness direction and the inner diameter increases toward both ends, it is a trumpet shape, so bend the pipes smoothly on both sides of the half PC plate 3. You can

[0031]

As described above, since the pipe hole forming member of the present invention forms the pipe hole integrally with the half PC plate, it is not necessary to remove the half PC plate with the pipe hole after manufacturing. Productivity in the factory of half PC boards with piping holes is improved. Further, the pipe hole forming member of the present invention,
Since it has a minimum inner diameter that does not allow a gap between itself and the outer peripheral surface of the pipe in a part of the axial direction, after inserting the pipe, concrete is poured without filling the pipe hole. Therefore, it is possible to save the labor at the construction site and to carry out the construction efficiently. Also, since the minimum inner diameter part is provided in a part in the axial direction and the inner diameter is larger than that except for that part, it is possible to bend the pipe inside this member and bend the pipe without difficulty. it can.

[Brief description of drawings]

FIG. 1 shows an embodiment of a pipe hole forming member according to the present invention, (a) is a front view, (b) is a side view, (c) is a bottom view, and (d) is a plan view of a cap.

FIG. 2 is a cross-sectional view showing a method for manufacturing a half PC board with a piping hole using the piping hole forming member of FIG.

3 is a half P with a piping hole manufactured by the method of FIG.
Sectional drawing which shows the use condition of C board.

FIG. 4 is a front view of a half cutaway showing another embodiment of the pipe hole forming member according to the present invention.

FIG. 5 is a cross-sectional view showing a method for manufacturing a half PC board with piping holes using the piping hole forming member of FIG.

6 is a half P with a piping hole manufactured by the method of FIG.
Sectional drawing which shows the use condition of C board.

FIG. 7 is a half-cutaway front view showing still another embodiment of the pipe hole forming member according to the present invention.

8 is a cross-sectional view showing a half PC board with a piping hole using the piping hole forming member of FIG.

FIG. 9 is a cross-sectional view showing a conventional method for manufacturing a half PC board with piping holes.

FIG. 10 is a cross-sectional view showing a usage state of a conventional half PC board with a piping hole. 1: Bed 3: Half PC board 3A: Half PC board with piping hole 5: Piping 11: Piping hole forming member 12: Minimum inner diameter portion 13: Cylindrical body 14: Flange portion 18: Cap

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-6-335915 (JP, A) JP-A-8-103906 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) H02G 3/22 B28B 23/00 E04B 5/32 B28B 11/00

Claims (4)

(57) [Claims] 1. A cylindrical body (13) having a minimum inner diameter portion (12) in a part of the axial direction and having a larger inner diameter than the minimum inner diameter portion (12). Her inner diameter of) is characterized in that it is substantially set to a size that no gap between the outer peripheral surface of the pipe (5) therethrough
Piping hole forming member for PC board . 2. A cylinder having a minimum inner diameter portion (12) at one end or an intermediate portion in the axial direction, and the inner diameter increases in a trumpet shape from the minimum inner diameter portion (12) to the other end or both ends. A half PC, comprising a body (13), wherein the inner diameter of the smallest inner diameter portion (12) is set to a size such that there is substantially no gap between it and the outer peripheral surface of the pipe (5) passing therethrough. Board
Use piping hole forming member. 3. The half according to claim 1, wherein a flange portion (14) is formed at one end portion.
Piping hole forming member for PC board . 4. A pipe hole, characterized in that the pipe hole forming member (11) according to any one of claims 1 to 3 is attached to a required position of a half PC board (3) to form a pipe hole. Half PC board with.