JPH07298460A - Recess forming tool for bent piping and bent piping apparatus - Google Patents

Abstract

PURPOSE:To provide a recess forming too; that makes it possible to lay bent piping within a wall of two-layered structure, composed of a precast concrete wall and a cast-in-place concrete wall, without buckling any pipe or degrading the strength of the cast-in-place concrete wall. CONSTITUTION:This recess forming tool is obtained by combining and alternately bonding bent thin steel plates. It is of a frame body shape; it is open at the top and is encircled with circumferential walls 11 on the side. It has therein a recess to ensure a space required for laying bent pipes and partitions 13 having a plurality of pipe through holes 14.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recess for forming a recess for bending pipe in a precast concrete wall for bending a pipe in a two-layer structure wall of a precast concrete wall and a cast concrete wall. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a forming tool and a bending piping device installed on a precast concrete wall for bending a pipe in a two-layer structure wall including a precast concrete wall and a cast concrete wall.

[0002]

2. Description of the Related Art Conventionally, the walls of buildings such as slabs have not been constructed by placing concrete, but at the factory or on-site, a concrete wall (precast concrete wall) with pipes embedded inside has been prepared in advance. The so-called PC method of assembling this on-site is performed.
This PC construction method does not require the installation of the formwork and the bar arrangement work that is required when pouring and constructing concrete at the site,
In addition, there is no need for work such as fixing concrete embeddings used for piping on the site to the formwork, which has the advantage that construction can be performed easily. On the other hand, however, the PC method has problems that the piping cannot be changed or modified at the site, and that transportation to the site is troublesome.

Therefore, recently, a construction method using a two-layer structure wall of a precast concrete wall and a cast concrete wall has been developed. This construction method is called the half-PC construction method, and as shown in FIG.
A pipe P1 of an appropriate length for the pipe connection port of the concrete buried object B
, And a precast concrete wall PC embedded with concrete is prepared with the end of the pipe P1 exposed. Next, this is installed in a construction site, the skeletal reinforcing bar S is arranged on it, the exposed pipe P1 is bent, and another pipe P2 is connected to this through the connecting tool C and piped. , Spinal rebar S
Further, by constructing a cast concrete wall RC by placing concrete so that the pipes P1 and P2 are embedded inside, a building wall is constructed by a two-layer structure wall of the precast concrete wall PC and the cast concrete wall RC. It is designed to do.

According to such a half-PC method, the precast concrete wall can be used as it is as a formwork, so that the work of installing the formwork is unnecessary, while the advantage of the PC method remains, and further, the change of piping on site or It has the advantage that it can be easily corrected and covers the drawbacks of the PC method.

However, in carrying out such a half-PC construction method, the thickness of the cast concrete wall becomes thin due to the thickness of the precast concrete wall, so that it is largely used when bending a pipe exposed upward from the precast concrete wall. It cannot be bent. For this reason, if the bending diameter of the pipe is reduced, it becomes difficult to carry out the work of passing the wire through the inside of the pipe, and the bent portion will buckle and the wire cannot be passed. On the other hand, if the bending diameter is increased so as to reach the surface of the cast concrete wall, the strength of the skeleton of the cast concrete wall becomes weak, which is not preferable.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and an object thereof is to provide a pipe in a two-layer structure wall of a precast concrete wall and a cast concrete wall. Without buckling
Also, without reducing the strength of the cast concrete wall,
An object of the present invention is to provide a recess forming tool and a bending piping device capable of bending piping.

[0007]

[Means for Solving the Problems] That is, as a means for solving the above-mentioned problems, the invention according to claim 1 is a pipe for bending a pipe in a two-layer structure wall of a precast concrete wall and a cast concrete wall. It is a recess forming tool for forming a recess for bent pipe in a precast concrete wall, and it is formed in a frame shape embedded to penetrate the precast concrete wall and is necessary for bending pipe inside The recess forming tool for a bent pipe is characterized in that it has a recess that secures a sufficient space and a partition wall that forms a communication hole for piping. "

Further, the invention according to claim 2 is that "the communicating hole for the pipe is closed by a knockable knock portion and is formed by punching, and the recess for bent pipe according to claim 1 is formed. "Forming tool" is its content.

The invention according to claim 3 is that "the recess is formed by gradually expanding a part or all of the recess, and the recess for a bent pipe according to claim 1 or 2. "Forming tool" is its content.

The invention according to claim 4 is a bending pipe apparatus installed on a precast concrete wall for bending a pipe in a two-layer structure wall of a precast concrete wall and a cast concrete wall, A recess that is formed in the shape of a frame that is embedded to penetrate a precast concrete wall and that has a recess inside that secures the space necessary for bent pipe piping and a partition wall that has a communication hole for piping The bent pipe apparatus comprises a forming tool and a pipe connecting tool housed in the recess and attached to a communication hole for piping ".

Further, the invention according to claim 5 is the "bent pipe apparatus according to claim 4, characterized in that the recess is formed such that a part or the whole thereof is gradually enlarged. I am trying.

In the above inventions, the communication hole for piping is for communicating the piping inside the wall and the piping outside the wall, and is formed as an insertion hole for inserting the pipe. These include a port having a locking claw for locking the pipe, a port formed as a connection port for directly connecting the pipe, and a port formed as an attachment port for mounting the pipe connector. Further, the partition wall forming the communication hole for piping is not limited to the one in which the communication hole for piping has already been formed, and may be one that can be formed by being opened later.
Even if the partition wall is provided integrally inside the recess forming tool,
It may be attached separately.

[0013]

The recess forming tool according to the first aspect of the present invention,
It is shaped like a frame that is embedded to penetrate through a precast concrete wall, and has a recess inside that secures the space necessary for bending the pipe, which ensures sufficient space for bending the pipe. A precast concrete wall can be produced, and a partition wall that forms a communication hole for piping can be used to connect a pipe directly to the communication hole or through a pipe connector to reduce the bending diameter on site. It is possible to bend a pipe without forming a cast concrete wall on a precast concrete wall.

Further, in the recess forming tool according to the second aspect of the present invention, the communication hole for piping is closed by the knockable knock portion, so that the knock portion is punched only at a necessary portion to form the communication hole. However, it is now possible to form a cast concrete wall on a precast concrete wall by connecting a pipe to this directly or via a pipe connector and bending the pipe without reducing the bending diameter. There is.

Further, in the recess forming tool according to the third aspect of the present invention, a part or the whole of the recess is formed so as to be gradually enlarged, so that the space required for the bent pipe can be kept to a minimum. It is possible to manufacture the recess forming tool having the above-described shape, and it is also possible to make the recess forming tool preferable from the viewpoint of securing the strength of the precast concrete wall manufactured by embedding the recess forming tool.

Further, in the bent pipe apparatus according to the invention as defined in claim 4, the recess forming tool can secure a sufficient space for the bent pipe of the pipe in the precast concrete wall, and further in the recess. By connecting the pipe to the pipe connection port of the pipe connector that is housed in the pipe and attached to the communication hole for piping, the pipe is bent without reducing the bending diameter and placed on the precast concrete wall. It is now possible to form concrete walls. In this bent piping device, the communication hole for piping remains the same,
The pipes can be connected to the pipes having different diameters by making the pipe connection ports correspond to each other.

In the bent pipe apparatus according to the fifth aspect of the present invention, in the recess forming tool for accommodating the pipe connector, the recess forming is such that the space required for the bent pipe is minimized. It is possible to manufacture a tool, and it can be a preferable recess forming tool from the viewpoint of securing the strength of the body of the precast concrete wall that is manufactured by embedding the recess forming tool.

By using the recess forming tool and the bent piping device, the bent portion of the pipe will not buckle and the work of passing the wire through the pipe will not be hindered. Bending piping can be performed without reducing the core strength.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the embodiments shown in the drawings. 1 to 3 show an embodiment of a recess forming tool according to the present invention, FIG. 1 is a perspective view thereof, FIG. 2 is a plan view thereof, and FIG. 3 is a pipe connecting device mounted to produce a precast concrete wall. It is sectional drawing which shows a state.

As shown in FIGS. 1 and 2, the recess forming tool 1 is made by combining bent thin steel plates and joining them to each other. A partition wall 13 is formed in a frame shape surrounded by 11, and has a recess and a partition wall 13 having a plurality of communication holes 14 for piping therein. The peripheral wall 11 of the recess forming tool 1 has a flange 12 for fixing the recess forming tool 1 to a formwork at the time of producing a precast concrete wall in the lower part thereof, and as shown in FIG. A boundary wall is formed to prevent the poured concrete from entering the inside of the recess forming tool 1 when the wall PC is manufactured. In addition, in order to cope with the case where the wall thickness of the precast concrete wall PC is different, it is preferable that the height of the peripheral wall 11 is formed to match the wall thickness of the thickest precast concrete wall. As a result, it can be commonly used for producing precast concrete walls having different wall thicknesses. The recess forming tool 1 may be manufactured by synthetic resin molding.

Inside the recess forming tool 1, a pipe connecting tool 2 which is attached to a communication hole 14 for piping provided in a partition wall 13 is accommodated, and is gradually expanded toward the opening at the upper part. The formed recess is formed. As shown in FIG. 10, this recess is for bending the pipe P connected to the pipe connection port 21 of the pipe connector 2 in the two-layer structure wall of the precast concrete wall PC and the cast concrete wall RC. Forms the space needed for. In addition, in the recess forming tool 1 of this embodiment, a part of the recess is formed so as to gradually expand toward the upper opening as a form for ensuring the space required for the bent pipe to a minimum. In the present invention, the recess is not limited to the one that is formed so as to be gradually expanded as long as it is a recess that secures a space necessary for bending the pipe.

Partition wall 1 provided inside the recess forming tool 1
3 is necessary as a partition for preventing the concrete from flowing out when the concrete is cast on site and the cast concrete wall RC (FIG. 10) is produced. or,
The partition wall 13 is formed with a communicating hole 14 for piping for communicating the pipe inside the wall and the pipe outside the wall. As in this embodiment, the pipe connecting tool 2 is held by using the communicating hole 14. A partition wall 13 is used to place the sheet. Such a partition wall 13
May be integrally formed with the peripheral wall 11 or may be attached separately.

As shown in FIG. 9, the communication hole 14 is closed by connecting the pipe P directly or through the pipe connector 2 before the concrete wall for casting is formed. As shown in FIGS. 4 and 5, the communication hole 14 may be pre-closed by the knockable knock portion 15, so that the knock portion 15 may be punched only at a necessary portion and an opening may be formed later.

Since the precast concrete wall in which the recess forming tool 1 is embedded is manufactured according to the design in advance, the recess forming tool 1 also has various forms (FIGS. 12 to 23) in accordance with the design. ) Is used. Therefore, although it is premised that all communication holes for piping are used, there may be cases where communication holes that are not used are generated due to design changes. In such a case, the design change can be easily dealt with by using the recess forming tool 1 having the configuration shown in FIGS. 4 and 5. In addition, as shown in FIG. 5, the knock portion 15 has a notch formed at the peripheral edge of the communication hole 14,
It adopts a structure in which a part or all is joined by thin wall, and can be easily punched by a driver or the like.

To prepare a precast concrete wall using the recess forming tool 1 shown in FIG.
1. The flange 12 formed in the lower part is brought into contact with a formwork for producing a precast concrete wall, and fixed by tightening with bolts and nuts, nailing, or tape bonding. Then, concrete is poured and solidified, and then, as shown in FIG.
A precast concrete wall PC is prepared as shown in FIG. The pipe connector 2 is housed inside the recess forming tool 1 and is attached to the communication hole 14 provided in the partition wall 13. For mounting, the pipe connection port 21 provided at one end of the pipe connection tool 2 is turned up, the male screw portion 23 provided at the other end of the pipe connection tool 2 is inserted into the communication hole 14, and the nut 24 is attached to the male screw portion 23. It is attached by screwing and tightening. This makes it possible to produce a precast concrete wall PC for forming a cast concrete wall on site. The pipe connector 2 may be attached to the communication hole 14 when the recess forming tool 1 is fixed to the mold.

The recess forming tool of the present invention is not limited to the one in which the communication hole 14 for piping is formed as a mounting port for mounting the pipe connecting tool 2 as in the embodiment, but an insertion hole for inserting a pipe. It may be formed as, or may be formed as a connection port for directly connecting the pipe by forming a receiving port provided with a locking claw for locking the pipe. In the case of such a recess forming tool, as shown in FIG.
Is not attached, and there is no need for a space for accommodating the pipe connector 2 inside.

Further, the recess forming tool of the present invention is formed in the shape of a frame embedded to penetrate a precast concrete wall, and its shape is not limited to a rectangular parallelepiped or a rectangular parallelepiped.
It may be formed in a cylindrical shape, or may have another shape. Further, it is not limited to the form having an opening at the top as in the embodiment shown in FIG. 1, but may be one whose upper surface is closed by a closing body 16 as shown in FIG. 24, for example. This occlusion body 16 is removable,
It may be configured with a cap body by fitting, or may be configured with a plug such as styrofoam or cork,
Further, it may be formed integrally with the peripheral wall 11 and can be removed by punching. By providing such a closing body 16, as shown in FIG. 24, it is possible to reliably prevent the concrete from entering the inside of the recess forming tool 1 during the production of the precast concrete wall.

Further, the recess forming tool of the present invention may have a structure capable of adjusting its height. For example, as shown in FIG. 25, a movable part formed by forming a fixed-side forming tool 1 a formed by forming a female screw portion 17 on the inner surface of a recess formed in a cylindrical shape and a male screw portion 18 screwed to the female screw portion 17. The recess forming tool 1 including the side forming tool 1b may be configured so that the overall height can be adjusted by rotating the movable side forming tool 1a. With such a configuration, it is possible to easily cope with the production of precast concrete walls with different wall thicknesses.
The product can be made compact. The height is not limited to the screwed structure shown in the figure, and the structure may be such that the height can be adjusted by sliding, and the height can be adjusted by changing the distance between the fixed-side forming tool 1a and the movable-side forming tool 1b by screwing a screw. Good structure.

FIG. 6 and FIG. 7 show an embodiment of a bent piping device including the recess forming tool 1 and the tube connecting tool 2. The pipe connector 2 used here is the same as that shown in FIG. 3, and has a pipe connection port 21 at one end and a male screw portion 23 into which a nut 24 is screwed at the other end. The nut 24 is screwed into the male screw portion 23 inserted through the communication hole, and is tightened to be attached to the recess forming tool 1. A large number of locking claws 22 (FIG. 6) are provided in the tube connection port 21 for locking the tube inserted therein.
Is provided. In this bent piping device, the pipe connecting holes can be connected to pipes having different diameters while the pipe communicating holes are left unchanged.

The pipe connector 2 is not limited to the one attached to the recess forming tool 1 by screwing the nut 24 into the male screw portion 23 inserted through the communication hole and tightening the nut, but is attached by fitting. It may be screwed with a screw or a screw.

Further, the recess forming tool 1 used in the bent pipe apparatus is formed so that the recess gradually expands toward the upper opening, and a form for ensuring a minimum space required for the bent pipe. However, the present invention is not limited to this, as long as it has a recess that secures a space necessary for the bent pipe. Further, the recess forming tool 1 may be embodied with a structure in which the upper surface is closed by the closing body 16 as shown in FIG. 24 or a structure in which the height can be adjusted as shown in FIG.

As the pipe connector used in the recess forming tool and the bent piping device of the present invention, various pipe connectors used for conventional pipe connections such as connectors and couplings can be used.

Next, an example of piping by the half PC method using a precast concrete wall using the recess forming tool 1 shown in FIG. 1 will be specifically described. First, as shown in FIG. 8, in a factory or the like, the pipe forming tool 2 is attached to the recess forming tool 1.
A precast concrete wall PC equipped with is prepared. Next, as shown in FIG. 9, at the site, a precast concrete wall PC is installed, and a skeletal reinforcing bar S is laid at a place where a concrete wall for casting is formed, while one end of a pipe P for bending piping is recessed. Pipe connector 2 attached to forming tool 1
It is connected to the pipe connection port 21 of. Then, the pipe P is bent using the space formed on the pipe connection port 21 by the recess forming tool 1. Next, as shown in FIG. 10, concrete is poured to form a cast concrete wall RC on the precast concrete wall PC. This makes it possible to embed a bent pipe in a desired state in a two-layer structure wall including a precast concrete wall and a cast concrete wall.

The pipe P used for the bent pipe is not limited to the corrugated pipe having flexibility, and as shown in FIG. 11, the strength against the pouring of concrete at the time of forming the pouring concrete wall RC. A pre-bent hard tube Pa having flexibility may be used.

[0035]

As described above, according to the present invention configured as described above, in the pipe construction method using the two-layer structure wall of the precast concrete wall and the cast concrete wall, the inside of the two-layer structure wall is The pipe can be bent in a desired state. Therefore, it is difficult to carry out the wiring work into the pipe, and the problem that the bent part buckles and the wire cannot be passed, and the bending part is embedded in the surface of the cast concrete wall, and It has the effect of not causing problems such as weakening.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a recess forming tool according to the present invention.

2 is a plan view of the recess forming tool shown in FIG. 1. FIG.

FIG. 3 is a cross-sectional view showing a state in which a precast concrete wall is produced using the recess forming tool shown in FIG.

FIG. 4 is a plan view showing another embodiment of the recess forming tool according to the present invention.

5 is a cross-sectional view taken along the line AA of FIG.

FIG. 6 is a plan view showing an embodiment of a bent piping device according to the present invention.

7 is a cross-sectional view of the device shown in FIG.

8 is a cross-sectional view showing a step in a piping construction example using the recess forming tool shown in FIG. 1. FIG.

9 is a cross-sectional view showing a step in a piping construction example using the recess forming tool shown in FIG. 1. FIG.

FIG. 10 is a cross-sectional view showing a step in a piping construction example using the recess forming tool shown in FIG. 1.

FIG. 11 is a sectional view showing a step of another piping construction example using the recess forming tool shown in FIG.

FIG. 12 is a perspective view showing another embodiment of the recess forming tool according to the present invention.

13 is a plan view of the recess forming tool shown in FIG. 12. FIG.

FIG. 14 is a perspective view showing another embodiment of the recess forming tool according to the present invention.

15 is a plan view of the recess forming tool shown in FIG. 14. FIG.

FIG. 16 is a perspective view showing another embodiment of the recess forming tool according to the present invention.

17 is a plan view of the recess forming tool shown in FIG. 16. FIG.

FIG. 18 is a perspective view showing another embodiment of the recess forming tool according to the present invention.

FIG. 19 is a plan view of the recess forming tool shown in FIG. 18.

FIG. 20 is a perspective view showing another embodiment of the recess forming tool according to the present invention.

FIG. 21 is a plan view of the recess forming tool shown in FIG. 20.

FIG. 22 is a perspective view showing another embodiment of the recess forming tool according to the present invention.

23 is a plan view of the recess forming tool shown in FIG. 22. FIG.

FIG. 24 is a cross-sectional view showing another example of the recess forming tool according to the present invention and showing a state in which a precast concrete wall is produced.

FIG. 25 is a sectional view showing another embodiment of the recess forming tool according to the present invention.

[Fig. 26] Fig. 26 is a cross-sectional view showing a conventional piping construction state by a two-layer structure wall of a precast concrete wall and a cast concrete wall.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Recess forming tool 2 Pipe connecting tool 11 Peripheral wall 13 Partition wall 14 Communication hole for piping 15 Knock part PC Precast concrete wall RC Casting concrete wall P pipe

Claims (5)

[Claims] 1. A recess forming tool for forming a recess for bending pipe in a precast concrete wall for bending a pipe in a two-layer structure wall of a precast concrete wall and a cast concrete wall, It was formed in the shape of a frame that is buried to penetrate through the precast concrete wall, and has a recess that secures the space necessary for bending the pipe inside and a partition wall that forms a communication hole for the pipe. A feature for forming recesses for bent pipes. 2. The recess forming tool for bent piping according to claim 1, wherein the communication hole for piping is closed by a knockable knock portion and is formed by punching. 3. The recess forming tool for a bent pipe according to claim 1, wherein the recess is formed such that a part or all of the recess is gradually enlarged. 4. A bending piping device installed on a precast concrete wall for bending a pipe in a two-layer structure wall consisting of a precast concrete wall and a cast concrete wall, which is embedded so as to penetrate the precast concrete wall. A recess forming tool that is formed in a frame shape and that has a recess that secures a space necessary for bending the pipe inside, and a partition wall that has a communication hole for the pipe, and is housed in the recess. And a pipe connector attached to a communication hole for piping. 5. The bent pipe apparatus according to claim 4, wherein the recess is formed by gradually enlarging a part or all of the recess.