JP4690844B2 - Manufacturing method of piping box with bearing joint and adjusting member and mold used therefor - Google Patents

Description

The present invention relates to a method for manufacturing a piping box to which a receiving joint to which an end of an underground pipe such as a conduit pipe is connected, and an adjustment member and a mold used therefor.

  End portions of underground pipes such as electric pipes are connected to piping boxes such as hand holes and manholes. Conventionally, as a means to connect the end of underground pipe to the piping box, a hole is made in the wall of the piping box at the construction site, and a receiving joint is inserted into the hole and fixed with mortar or epoxy putty. It is known to connect underground pipes to pipe joints via pipe joints (Patent Document 1).

Japanese Patent Laid-Open No. 9-324437

  However, it is very cumbersome and time-consuming to attach the receiving joint to the piping box at the construction site, which causes a delay in the construction period. In order to solve this problem, it is effective to eliminate the receiving joint installation work at the construction site by attaching the receiving joint to the piping box at the stage of manufacturing the piping box at the factory. In this case, it is inefficient to make a hole in the finished piping box and attach the receiving joint, so when molding the piping box by pouring molding material (concrete etc.) into the mold, It is preferable to end up.

  However, because the mold for forming the piping box is provided with a draft angle in the portion where the wall of the piping box is molded, that is, the surface for molding the inner and outer surfaces of the piping box wall is not parallel, it is simply placed at a predetermined position on the mold. If only the receiving joint is fixed, there is a problem that a gap is formed between one end face of the receiving joint and the inner surface of the mold, and the molding material flows into the receiving joint.

An object of the present invention is to provide a method for efficiently producing a piping box with a receiving joint, and an adjusting member and a mold used therefor, by preventing the molding material from flowing into the receiving joint by using a simple adjusting member. There is.

  In order to achieve the above object, the present invention fixes a receiving joint having a spiral groove on the inner peripheral surface to a wall forming portion of a mold having a draft angle on the surface of the piping box wall, and a molding material is attached to the mold. In a method of manufacturing a piping box with a receiving joint by pouring and solidifying, an adjusting member capable of adjusting a protruding length and an inclination angle from one end side of the receiving joint when the receiving joint is fixed to a mold And adjust the protruding length of the adjusting member from one end of the receiving joint and adjust the inclination angle of the adjusting member with respect to the receiving joint or the inclination angle of the receiving joint with the adjusting member so that the adjusting member of the receiving joint protrudes. The other end face is brought into close contact with the inner face of the mold.

  More specifically, in the manufacturing method of the piping box with a receiving joint according to the present invention, when the receiving joint is fixed to a mold, a spiral protrusion on the outer peripheral surface is provided on one end side of the receiving joint. Screw the adjusting member that is loosely screw-coupled with the spiral groove on the peripheral surface, and adjust the protruding length of the adjusting member from one end of the receiving joint by rotating this adjusting member relative to the receiving joint And adjusting the inclination angle of the adjusting member with respect to the receiving joint or the adjusting member with respect to the adjusting member by the gap so that the end face of the receiving joint and the adjusting member that is not screw-coupled to the inner surface of the mold is in close contact with the inner surface of the mold. It is characterized by.

  In the adjustment member used in the present invention, it is preferable that a joining member that can be attached to and detached from the inner surface of the mold is attached to an end face that is not screw-coupled to the receiving joint.

  As the above-mentioned joining member, a magnet, plastic or rubber magnet is used when the mold material is a magnetic material, and a double-sided adhesive tape or adhesive is used when the mold material is a non-magnetic metal material, wood or hard plastic. It is preferable to use it. When the mold material is a magnetic material, a double-sided adhesive tape or an adhesive can be used.

  The mold used in the present invention includes an inner mold having a draft on the surface of the wall of the piping box, an outer mold disposed around the mold, and one end of the receiving joint that is attached to at least one end of the receiving joint. And an adjustment member capable of adjusting the inclination length and the inclination angle.

  According to the present invention, an adjusting member that is loosely screw-coupled to the receiving joint is screwed into one end side of the receiving joint, and a protruding length from one end of the receiving joint and an inclination angle with respect to the receiving joint are adjusted, Since the end surface of the adjustment member that is not screw-coupled with the counterpart can be brought into close contact with the inner surface of the mold, it is possible to prevent the molding material from flowing into the receiving joint when the molding material is poured into the mold. Therefore, a piping box with a receiving joint can be manufactured efficiently. In addition, the adjustment member can be easily removed by rotating it in the opposite direction of screwing after manufacturing the piping box with a receiving joint, so that it can be used repeatedly, and the cost is low.

  Also, if the adjustment members are prepared as many as the maximum number of the receiving joints embedded in the wiring box, sufficient correspondence can be achieved regardless of the number and position of the holes in the wiring box. Furthermore, even if the size and wall thickness of the wiring box change, any design can be accommodated by changing only the outer and inner molds.

[Embodiment 1] First, referring to FIG. 1A, a receiving joint and an adjusting member used in the present invention will be described. The receiving joint 1 and the adjusting member 2 are both plastic molded bodies. The receiving joint 1 is embedded in the wall of a piping box, and is formed by integrally forming a flange portion 1c at one end of a spiral wave tube 1b having a spiral groove 1a on an inner peripheral surface. The length of the receiving joint 1 is slightly shorter than the thickness of the wall of the piping box. The flange portion 1c is provided as necessary to secure the pull-out resistance from the piping box of the receiving joint 1. For example, when the pull-out resistance can be secured by the waveform of the outer peripheral surface of the spiral wave-attached tube 1b, it is omitted. May be.

  On the other hand, the adjusting member 2 is in the form of a corrugated tube that can be screwed into the receiving joint 1. The spiral protrusion 2a on the outer peripheral surface of the adjustment member 2 is formed so as to be loosely screw-coupled with the spiral groove 1a on the inner peripheral surface of the receiving joint 1 with a gap G. The length of the adjustment member 2 is shorter than the length of the receiving joint 1. The adjusting member 2 can adjust the protruding length T from the end face of the receiving joint 1 by adjusting the screwing amount into the receiving joint 1. In addition, since the adjustment member 2 is screwed into the receiving joint 1 and there is a gap G between the inner surface of the receiving joint 1 and the axis of the receiving joint 1 as shown in FIG. It can be tilted slightly with respect to the direction. It is preferable to attach a joining member 3 to a mold such as a sheet magnet or a double-sided adhesive tape on the outer end surface of the adjustment member 2.

  2 and 3 show an embodiment of a method for manufacturing a piping box with a receiving joint according to the present invention using the receiving joint 1 and the adjusting member 2 as described above. The mold for forming the piping box is usually made of metal (many of iron), and is composed of a mold base 4a, an inner mold 4b, and an outer mold 4c. First, as shown in FIG. 2A, an inner mold 4b having a box upside down is fixed on a mold base 4a. The peripheral wall of the inner mold 4b is provided with a draft so that the inner mold can be extracted from a piping box molded later. The draft angle is 5 ° or less in the standard of the Ministry of Land, Infrastructure, Transport and Tourism, but there are many cases of 2-3 ° in practice.

  After the inner die 4b is fixed on the die base 4a, the flange portion 1c of the receiving joint 1 is attached to a predetermined position on the peripheral wall of the inner die 4b with a double-sided adhesive tape or the like. Since there is a draft on the peripheral wall of the inner mold 4b, the receiving joint 1 attached to the inner mold 4b is inclined with respect to the horizontal plane by an angle substantially corresponding to the draft. An adjusting member 2 is screwed into the receiving joint 1.

  Next, as shown in FIG. 2B, the outer mold 4c is assembled around the inner mold 4b to complete the mold 4. Since the inner surface of the outer mold 4c is perpendicular to the mold base 4a, when the outer mold 4c is assembled, a gap S is formed between the outer mold 4c and the end surface of the adjustment member 2 as shown in FIG. Can be done. Therefore, the adjustment member 2 is rotated to adjust the protruding length of the adjustment member 2 from the end face of the receiving joint 1, and the inclination angle of the adjusting member 2 with respect to the receiving joint 1 is adjusted, as shown in FIG. As shown, the end face of the adjusting member 2 is brought into close contact with the inner surface of the outer mold 4c (the receiving joint 1 and the adjusting member 2 are stretched between the inner mold 4b and the outer mold 4c).

  In this state, if the concrete 5 is poured into the mold 4 as shown in FIG. 2C, the concrete 5 can be prevented from entering the receiving joint 1. After the concrete 5 is solidified, the outer mold 4c and the mold base 4a are removed, the inner mold 4b is removed, and the adjusting member 2 is removed by rotating it in the reverse direction of screwing, and the top and bottom are turned upside down. A piping box 6 with a receiving joint as shown in FIG. The extracted adjustment member can be used repeatedly in the same manner as the mold.

Embodiment 2 FIGS. 4 and 5 show another embodiment of the present invention. In this embodiment, first, as shown in FIG. 4A, the inner die 4b is fixed on the die base 4a, the adjusting member 2 is attached to a predetermined position on the inner surface of the outer die 4c before assembly, and the adjusting member 2 is further fixed. The receiving joint 1 is screwed together. If the joining member 3 such as a sheet magnet is attached to the outer end surface of the adjustment member 2, the adjustment member 2 can be easily fixed to the outer mold 4c.

  After that, as shown in FIG. 4B, the outer mold 4c is assembled around the inner mold 4b to complete the mold 4. In the assembled state of the outer mold 4c, a gap S is formed between the inner mold 4b and the flange 1c side end surface of the receiving joint 1 due to the draft of the inner mold 4b, as shown in FIG. . Therefore, the protrusion length of the adjusting member 2 from the end face of the receiving joint 1 is adjusted by rotating the receiving joint 1, and the inclination angle of the receiving joint 1 with respect to the adjusting member 2 is adjusted, as shown in FIG. As shown, the end face of the receiving joint 1 is brought into close contact with the wall surface of the inner mold 4b (the receiving joint 1 and the adjusting member 2 are stretched between the inner mold 4b and the outer mold 4c).

  Thereafter, the same as in the first embodiment, the concrete 5 is poured and solidified as shown in FIG. 4C, and then the mold 4 and the adjusting member 2 are removed. A piping box 6 is obtained.

Embodiment 3 FIG. 6 shows still another embodiment of the present invention. This embodiment is a case where the receiving joint 1 is comprised with the pipe | tube with a simple spiral wave without a flange part. In this case, as shown in FIG. 6 (A), the adjustment member 2 can be attached to the inner mold 4b, and the receiving joint 1 can be screwed there. Also in this case, if the joining member 3 such as a sheet magnet is attached to the outer end surface (end surface on the inner die 4b side) of the adjusting member 2, the adjusting member 2 can be easily fixed to the inner die 4b.

  Next, after assembling the outer mold 4c as shown in FIG. 5B, the receiving joint 1 is rotated to bring the outer end face of the receiving joint 1 into close contact with the outer mold 4c. Thus, the central axis of the receiving joint 1 becomes substantially horizontal. Thereafter, as in the first and second embodiments, the concrete 5 is poured and solidified as shown in FIG. 1C, and then the mold 4 and the adjusting member 2 are removed. A pipe box 6 with a joint is obtained. According to this embodiment, it is possible to obtain the piping box 6 with the receiving joint in which the center axis of the receiving joint 1 is perpendicular or substantially perpendicular to the outer wall surface of the wiring box 6 (the central axis is horizontal or substantially horizontal). This makes it easy to connect underground pipes.

Embodiment 4 FIG. 7 shows still another embodiment of the present invention. The adjusting member 2 used in this embodiment includes a columnar base end block 7 fitted to one end side of the receiving joint 1, and a columnar end block 8 loosely inserted with a gap G on the other end side. Are connected via a coil spring 9. The base end block 7 can be attached to a predetermined position on the inner surface of the outer mold 4c by forming the whole with a magnet or attaching a magnet or a double-sided adhesive tape to the outer end surface. Further, since the outer diameter of the tip block 8 is slightly smaller than the inner diameter of the receiving joint 1 and there is a gap G between the inner peripheral surface of the receiving joint 1, the inclination angle can be adjusted with respect to the receiving joint 1. Is possible.

  In the adjustment member 2, when the coil spring 9 is not compressed, the length from the outer end surface of the base block 7 to the outer end surface of the distal end block 8 is larger than the distance between the outer mold 4c and the inner mold 4b. When the outer die 4c and the inner die 4b are sandwiched, the tip block 8 is pushed into the receiving joint 1 and the coil spring 9 is compressed. As a result, the outer end surface of the tip block 8 is pressed against the inner surface of the inner mold 4b having a draft angle by the repulsive force of the coil spring 9. Therefore, even if there is a slight gap S between the end face of the receiving joint 1 and the inner surface of the inner mold 4b, almost no concrete enters the receiving joint 1, but the gap S is filled with high viscosity grease or the like. This will further prevent the inflow of concrete. Note that the receiving joint 1 is held at a predetermined position in a state of being fitted to the proximal end block 7.

  Also in this embodiment, a wiring box with a receiving joint as shown in FIG. 6D can be manufactured. In this embodiment, the case where the base end block 7 of the adjustment member 2 is attached to the outer mold 4c has been described, but the base end block 7 can also be attached to the inner mold 4b. In that case, the manufactured wiring box with a receiving joint has a form as shown in FIG.

When the receiving joint used in the present invention and the adjusting member are screwed together, (A) is a half-cutaway side view showing a state in which the central axes of the two are coincident with each other, and (B) and (C) are respectively the receiving joints. The half incision side view which shows the state in which the adjustment member inclines with respect to the center axis line. (A)-(D) are sectional drawings which show one Embodiment of the manufacturing method of the piping box with a receiving joint which concerns on this invention in order of a process. (A) is an enlarged cross-sectional view of the main part showing a state when the outer mold is assembled by the manufacturing method of FIG. 2, (B) is an enlarged cross-sectional view of the main part showing a state in which the end face of the adjusting member is brought into close contact with the outer mold. Figure. (A)-(D) are sectional drawings which show other embodiment of the manufacturing method of the piping box with a receiving joint which concerns on this invention in process order. (A) is an enlarged cross-sectional view of the main part showing the state when the outer mold is assembled by the manufacturing method of FIG. 4, (B) is an enlarged cross-sectional view of the main part showing the state where the end face of the receiving joint is in close contact with the inner mold Figure. (A)-(D) are sectional drawings which show other embodiment of the manufacturing method of the piping box with a receiving joint which concerns on this invention in order of a process. Sectional drawing which shows other embodiment of the manufacturing method of the piping box with a receiving joint which concerns on this invention.

Explanation of symbols

1: receiving joint 1a: spiral groove 1b: pipe with spiral wave 1c: flange part 2: adjusting member 2a: spiral protrusion 3: joint member 4: mold 4a: mold base 4b: inner mold 4c: outer mold 5: concrete 6 : Piping box with bearing

Claims (5)

Piping with a receiving joint by fixing a receiving joint having a spiral groove on the inner peripheral surface to a wall forming portion of a mold having a draft on the surface of the piping box wall, and pouring the molding material into the mold and solidifying it. In a method of manufacturing a box,
When fixing the receiving joint to the mold, an adjustment member capable of adjusting the protruding length and inclination angle from one end side of the receiving joint is attached to the receiving joint, and the protruding length of the adjusting member from one end of the receiving joint is adjusted. And adjusting the inclination angle of the adjustment member with respect to the receiving joint or the inclination angle of the receiving joint with respect to the adjustment member so that the end surface of the receiving joint on which the adjustment member does not protrude is brought into close contact with the inner surface of the mold. Manufacturing method of piping box with joint.   When fixing the receiving joint to the mold, an adjusting member is screwed into one end side of the receiving joint so that the helical protrusion on the outer peripheral surface is loosely coupled with the helical groove on the inner peripheral surface of the receiving joint. The adjustment member is rotated relative to the receiving joint to adjust the protruding length of the adjusting member from one end of the receiving joint, and the tilt angle of the adjusting member with respect to the receiving joint or the adjusting member of the receiving joint is adjusted by the gap. The manufacturing method of a piping box with a receiving joint according to claim 1, wherein an end face of the receiving joint and the adjusting member which is not screw-coupled is closely contacted with an inner surface of the mold by adjusting an inclination angle with respect to the receiving joint.   An adjustment member used in the method for manufacturing a piping box with a receiving joint according to claim 2, wherein a connecting member that can be attached to and detached from the inner surface of the mold is attached to an end surface of the adjusting member that is not screw-coupled to the receiving joint. An adjusting member characterized by that.   When the mold material is a magnetic material, use a magnet, plastic or rubber magnet as the joining member, and when the mold material is a non-magnetic metal material, wood or hard plastic, use a double-sided adhesive tape or adhesive. The adjustment member according to claim 3, wherein   An inner mold with a draft angle on the surface that forms the wall of the piping box, an outer mold arranged around it, and at least one end side of the receiving joint to adjust the protruding length and inclination angle from one end of the receiving joint A mold for forming a wiring box with a receiving joint, characterized by comprising an adjustable member.

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