JP7121535B2 - Structure of plumbing box with conduit fitting and manufacturing method thereof - Google Patents

Description

TECHNICAL FIELD The present invention relates to a piping box such as a manhole or a handhole for connecting a conduit such as a flexible corrugated rigid polyethylene pipe (FEP pipe). The present invention relates to a technique for providing a plumbing box structure with installed conduit fittings and a method for manufacturing the same.

Conduits are used to protect electrical cables (electric wires) such as power cables and communication cables. Conduit has the role of protecting electric cables from impacts, etc., and improving aesthetic appearance by burying electric cables in the ground so that they cannot be seen from the ground. There are many types of electric conduits, such as various materials and shapes such as metal and synthetic resin.

A corrugated rigid polyethylene pipe (FEP pipe) is widely used as an underground pipe for burying electric cables in the ground. The FEP pipe has a standard size of inner diameter between 30 mm and 200 mm, for example, "30", "40", "50", ..., "150", "200".

Further, FEP pipes are installed by being connected to piping boxes such as handholes and manholes arranged at intervals of 30 m (meters) or less in order to facilitate the wiring of electric cables. To attach an FEP tube (conduits) to a handhole, a piping hole is formed through the handhole, and the FEP tube is connected to the piping hole. At this time, a joint for detachably mounting the FEP pipe is attached to the pipe hole.
Such a structure for mounting electric conduits is required to have a waterproof structure to prevent water from entering the handhole. Moreover, since a plurality of FEP tubes are connected to the handhole, there is a demand for a structure for easily attaching the FEP tubes to the handhole.

For example, Patent Literature 1 shows a structure for attaching a tubular body to a piping box. The piping box is provided with mounting holes (corresponding to the above-mentioned piping holes) for inserting the short pipe receiving joints. The receiving joint has a flange larger in diameter than the mounting hole at one end, and is inserted into the mounting hole from the inside of the piping box.
Also, a sleeve-shaped holder is attached to the other end of the receiving joint in a retaining manner. At this time, the holder is formed with a flange-shaped holding portion, and this holding portion presses the ring-shaped packing in a compressed state against the outer peripheral wall surface in a state of closing the outer end portion of the mounting hole. Therefore, the gap between the outer peripheral surface of the receiving joint and the inner surface of the mounting hole is sealed by the packing. Moreover, the receiving joint is attached to the attachment hole in a tightened state.

JP 2007-262841 A

Conventionally, even in the case of considering the water stopping effect as in Patent Document 1, the FEP pipe is firmly fixed at the beginning when it is connected and fixed to the pipe through-hole of the pipe box, but it is buried in the ground. There is a problem that the waterproofing effect gradually decreases if it is subjected to vibration or ground pressure after it has been installed.

In addition, if the FEP pipe is shaken during installation work, or if an external force such as ground pressure or freezing is applied, the flexible FEP pipe will move greatly, causing the receiving joint to vibrate. Therefore, the water stopping effect is lowered.
Since it is necessary to prevent water leakage in electrical wiring work, an adhesive is used to secure water stoppage when water leakage occurs. This work requires skill, and there is a problem that a waiting time is required until the adhesive solidifies.

As described above, the structure and method of attaching the electric conduit after forming the through-hole for piping in the piping box has limitations in terms of completely stopping water. Therefore, burying the desired receiving joints in advance when molding the piping box is an effective method for completely implementing waterproofing.
However, as mentioned above, there are many types of conduits with different inner diameters, and in practice, the conduits to be attached to the piping box are matched on site. Difficult in terms of cost and productivity.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and provides a conduit fitting that can completely stop water leakage from a conduit attached to a piping box and that can be attached to a desired conduit. To provide a structure of a piping box with electrical conduit joints and a method of manufacturing the same, which can be manufactured in terms of productivity and cost in manufacturing a piping box in which a is buried.

The first aspect of the invention is a method for manufacturing a piping box with conduit fittings, in which one or more conduit fittings are embedded in a plurality of side walls of the piping box.
That is, the conduit joint has an inner opening exposed to the inner surface of the piping box and a receptacle for attaching the conduit, and the piping box mold for forming the piping box forms the outer surface of the piping box. and an inner molding frame arranged with a gap for forming the side wall portion of the piping box inside the outer molding frame. A surface aligning step of arranging the conduit joints in which the inner openings of the one or more conduit joints are abutted against the abutting surface of a flat abutting plate to arrange and temporarily fix them on substantially the same plane. a formwork assembling step of abutting and arranging a holding member formwork surrounding the one or more conduit joints on the abutting surface of the abutment plate; and the holding member form On the abutment surface in the frame and on the outer circumference of the one or more conduit joints, a first molding material for forming a joint holding member is put into the one or more conduit joints. a joint holding member forming step of solidifying and molding the joint holding member to be held and fixed; and the outer frame for molding is formed in advance with a holding member opening for inserting the joint holding member, and the joint holding member is: an assembly step of an outer molding frame for inserting into the holding member opening so that the inner opening of the conduit joint is exposed to the inner surface of the piping box; and a piping box molding step of charging a second molding material for molding the piping box and solidifying and molding the piping box.

In the invention according to claim 2, the joint holding member comprises an inner side holding plate fixing the outer periphery of the one or more conduit joints on the side of the inner opening, and an inner side holding plate spaced from the inner side holding plate. and an outer surface side holding plate that fixes the outer periphery of the one or more conduit joints at a position on the outer surface side of the piping box, and in the forming step of the joint holding member,
An inner surface on which the first molding material is put on the abutment surface in the holding member mold and on the outer circumference of the one or more conduit joints to solidify and mold the inner surface side holding plate. a side retaining plate forming step, and on the inner side retaining plate and on the outer periphery of the one or more conduit joints, a removable filler material is provided to form a gap with the outer side retaining plate. an outer surface side for solidifying and molding the outer surface side holding plate by putting the first molding material on the filler material and on the outer circumference of the one or more conduit joints and solidifying and molding the outer surface side retaining plate; It is characterized by comprising a retaining plate forming step and a filler removing step of removing the filler spread in the filler spreading step.

The invention according to claim 3 is characterized in that the first molding material and the second molding material are the same material.

According to the piping box with conduit joints of the present invention, since the joint holding member is integrally formed with the side wall of the piping box, there is no boundary between the joint holding member and the side wall of the piping box. can completely prevent water leakage. If the joint holding member and the piping box are made of the same material, they will be more tightly integrated, which is effective in completely preventing water leakage. Moreover, since the one or more conduit joints are embedded in the joint holding member, it is possible to completely prevent water leakage from the boundary between the one or more conduit joints and the joint holding member.

In addition, even if one or a plurality of conduit joints are of different types, they are arranged in predetermined positions on the corresponding side wall in advance and held and fixed by the joint holding member, so that a made-to-order piping box can be manufactured. becomes easier. That is, it is possible to cope with productivity and cost in manufacturing a piping box in which a conduit joint to which a desired conduit can be connected is embedded.

In addition, when the joint holding member provided with the inner surface side holding plate and the outer surface side holding plate is embedded in the corresponding side wall portion of the piping box, the material of the piping box flows into the space between the inner surface side holding plate and the outer surface side holding plate. Since the joint holding member is closely attached to the outer periphery of the conduit joint by , the joint holding member is more closely adhered to the side wall of the piping box and integrated, which is effective in completely preventing water leakage.
Furthermore, since the joint holding member forms a space between the inner surface side holding plate and the outer surface side holding plate, the workability is improved due to the lighter weight.

According to the method of manufacturing a piping box with conduit fittings of the present invention, even if one or a plurality of conduit fittings are different types, the fitting holding member is arranged in advance at a predetermined position on the corresponding side wall portion. Since it is held and fixed in place, it becomes easy to manufacture a made-to-order piping box. That is, it is possible to cope with productivity and cost in manufacturing a piping box in which a conduit joint to which a desired conduit can be connected is embedded.

In addition, since the joint holding member having the inner side holding plate and the outer side holding plate forms a space between the inner side holding plate and the outer side holding plate, the workability is improved because the weight is reduced. Moreover, if the first molding material and the second molding material are made of the same material, they are more tightly integrated, which is effective in completely preventing water leakage.

1 is a perspective view of a piping box with a conduit fitting according to the present invention; FIG. Fig. 2 is a cross-sectional view of a structure in which a joint-type conduit joint is embedded in a piping box; FIG. 4 is a cross-sectional view of a structure in which a spiral type electric wire pipe joint is embedded in a piping box; FIG. 4 is a cross-sectional view of a structure in which a single mountain type electric wire pipe joint is embedded in a piping box; FIG. 10 is a front view for explaining a step of arranging the electric wire pipe joints in the process of manufacturing the joint holding member. FIG. 10 is a front view for explaining a form assembling step in the manufacturing process of the joint holding member; FIG. 4 is a front view for explaining a process of forming an inner surface side holding plate in a process of forming a joint holding member; FIG. 10 is a front view for explaining a filling material spreading step in the joint holding member forming step; FIG. 4 is a front view for explaining a process of forming an outer surface side holding plate in a process of forming a joint holding member; FIG. 10 is a front view for explaining a filler removing step in the joint holding member forming step; FIG. 4 is a front view showing a joint holding member holding a conduit joint in place; FIG. 3 is a perspective view for explaining a process of assembling a formwork for a piping box in a manufacturing process of the piping box; FIG. 4 is a cross-sectional view for explaining a process of assembling a formwork for a piping box in the manufacturing process of the piping box. FIG. 4 is a perspective view for explaining a process of assembling a molding outer frame in a process of manufacturing a piping box; FIG. 4 is a cross-sectional view for explaining a process of assembling a molding outer frame in the manufacturing process of the piping box;

A structure of a piping box with a conduit joint according to an embodiment of the present invention will be described below with reference to the drawings.
FIG. 1 is a perspective view schematically showing the entire plumbing box 10 with conduit joints. FIG. 2 is a cross-sectional view of a structure in which the conduit joint 20 is embedded in the piping box 10. As shown in FIG.

As shown in FIGS. 1 and 2, the structure of the piping box with conduit fittings of this embodiment is a structure in which one or more conduit fittings 20 are embedded in the side wall portion 12 of the piping box 10 . The piping box 10 corresponds to a manhole, a handhole, or the like.

As described in the prior art, the electric wire tube 40 is available in various types such as metal, synthetic resin, and various other materials and shapes. Further, the synthetic resin electric wire tube 40 includes a flexible corrugated rigid polyethylene tube (FEP tube), and the corrugated shape of the FEP tube includes a spiral type and a single mountain type. The helical type is an FEP pipe whose outer peripheral surface forms a helical waveform in the outer peripheral direction. The single-ridge type is an FEP pipe whose outer peripheral surface forms a single peak in the outer peripheral direction to form a corrugated shape.
To attach the FEP pipe 40 to the piping box 10 with a conduit joint, the FEP pipe 40 is attached to the conduit joint 20 and connected.

To explain the conduit joint 20 used in this embodiment, FIG. 5 shows an example of a conduit joint 20 called a "joint type." The conduit fitting 20 has an inner opening 21 exposed to the inner surface of the plumbing box 10 and a receptacle 22 for mounting the FEP tube 40 thereon.
To attach the FEP tube 40 to the conduit fitting 20, as shown in FIG. After that, the FEP tube 40 is connected by pressing the spigot 41 against the receptacle 22 of the conduit joint 20 . Therefore, the FEP pipe 40 is connected to the receptacle 22 of the conduit joint 20 through the spigot 41 regardless of whether the FEP pipe 40 is of the helical type 40a or the single-pronged type 40b.

In addition to the above-described "joint type", the conduit joint 20 includes a "spiral type" and a "single mountain type".
As shown in FIG. 3, the spiral-shaped electric wire pipe joint 20a connects a spiral-shaped FEP pipe 40a via a straight pipe joint 42. As shown in FIG. That is, the helical FEP pipe 40a is embedded in the side wall portion 12 of the piping box 10, and one end of the FEP pipe 40a protrudes outward from the side wall portion 12. be. A spiral type FEP pipe 40a is abutted against one end of the protruding electric wire pipe joint 20a and connected by a straight pipe joint 42a.

On the other hand, as shown in FIG. 4, the single mountain type electric wire pipe joint 20b connects the single mountain type FEP pipe 40b via the straight pipe joint 42. As shown in FIG. That is, as the single-ridge type electric wire pipe joint 20b, a single-ridge type FEP pipe 40b is used and embedded in the side wall portion 12 of the piping box 10, and one end of the FEP pipe 40b protrudes outward from the side wall portion 12. It is a structure that One end of the projecting electric wire pipe joint 20b is butted against a single mountain type FEP pipe 40b and connected by a straight pipe joint 42b.

The structure of the piping box with a conduit joint of the present embodiment can be any one of the above-mentioned "joint type conduit joint 20", "spiral type conduit joint 20a", and "single mountain type conduit joint 20b". , a detailed description will be given using the joint-type conduit joint 20, and a detailed description of the other conduit joints 20a and 20b will be omitted.

The piping box 10 with conduit joints is made by pouring a material such as concrete or resin into a mold and solidifying it. In this embodiment, as shown in FIG. However, the shape is not limited to a rectangular parallelepiped, and may be a polygonal polyhedron on a plane or a cylindrical box.

The main feature of the piping box 10 with conduit joints of this embodiment is that the inner openings 21, 21, ... of one or more conduit joints 20, 20, ... The purpose is to form joint holding members 30 which are arranged and held and fixed. In addition, the joint holding member 30 is arranged such that the inner opening 21 of the conduit joint 20 is exposed to the inner surface of the piping box 10 when the material of the piping box 10 is poured into the mold. It is embedded in the corresponding side wall portion 12 .
Even if the piping box 10 has a cylindrical outer shape, it can be applied by embedding the joint holding member 30 in the outer peripheral side wall of the piping box 10 .

1, 2 and 12, the joint holding member 30 is fixed to the inner opening 21 side of one or a plurality of conduit joints 20, 20, . . . An inner holding plate 31 and an outer circumference of one or more of the conduit joints 20, 20, . and an outer surface side holding plate 32 .

Therefore, since the joint holding member 30 is integrally formed with the side wall portion 12 of the piping box 10, there is no boundary between the joint holding member 30 and the side wall portion 12 of the piping box 10. Completely prevent leakage. Moreover, since the one or more conduit joints 20, 20, . . . can completely prevent water leakage.

Also, even if one or a plurality of conduit joints 20, 20, . , making it easier to manufacture a made-to-order plumbing box 10. That is, when manufacturing the piping box 10 in which the conduit joint 20 to which the desired conduit 40 can be connected is embedded, it is possible to cope with productivity and cost.

In addition, when the joint holding member 30 having the inner surface side holding plate 31 and the outer surface side holding plate 32 described above is embedded in the corresponding side wall portion 12 of the piping box 10, the material of the piping box 10 and the inner surface side holding plate 31 are Since it flows into the space 33 with the outer surface side holding plate 32 and adheres tightly around the outer periphery of the conduit joint 20, the joint holding member 30 is further closely adhered and integrated with the side wall portion 12 of the piping box 10, and complete water leakage is prevented. effective in prevention.
Furthermore, since the joint holding member 30 forms a space 33 between the inner surface side holding plate 31 and the outer surface side holding plate 32, the workability is improved because the weight is reduced.

Next, a method for manufacturing a piping box with a conduit joint according to an embodiment of the present invention will be described with reference to the drawings.
As shown in FIGS. 12 and 13, the piping box mold 50 for molding the piping box 10 includes a molding outer frame 51 forming the outer surface of the piping box 10 and a piping box inside the molding outer frame 51. 10, the bottom wall portion 11 and a molding intermediate frame 53 arranged with a space 54 for forming the side wall portion 12 therebetween.

The molding outer frame 51 is basically in the shape of a rectangular parallelepiped box having a space with an open top as a whole. In the present embodiment, the bottom plate 51a is rectangular in plan view, and four side walls 51b, . . . The four side walls 51b, .
In addition, the side wall 51b of the molding outer frame 51 is provided with a holding member opening 52 having a size such that the joint holding member 30 to which one or a plurality of wire tube joints 20, 20, . . . are fixed can be inserted. preformed.

In this embodiment, the molding middle frame 53 has a rectangular parallelepiped shape as a whole, and as shown in FIG. 51b, . . . , formed lower than the upper edge of 51b. It should be noted that the molding intermediate frame 53 may have a box-like shape with an opening on the bottom surface for lightening.
Further, the outer molding frame 51 and the middle molding frame 53 can be made of wood, but other materials may be used.

Next, a manufacturing process of the joint holding member 30 will be described.
The joint holding member 30 is applied when one or a plurality of conduit joints 20, 20, . . . are attached. The description will be made by taking the case of wearing as an example. In FIG. 12, six conduit joints 20, 20, . . . are mounted, but FIGS.
The process of manufacturing the joint holding member 30 includes a process of arranging the electric conduit joints in a flat surface, a process of assembling the formwork, and a process of forming the joint holding member.

As shown in FIG. 5, in the process of aligning the surfaces of the conduit joints, a release paper 57 is attached in advance to the abutment surface 56a of a flat abutment plate 56. As shown in FIG. A plurality of conduit joints 20, 20, . temporarily fix it. As a method for this temporary fixation, for example, the edge of the outer periphery of the inner opening 21 of each conduit joint 20 can be fixed to the abutment surface 56a of the abutment plate 56 with an adhesive 58 or the like.

In the form assembly process, as shown in FIG. 6, the plurality of conduit joints 20, 20, . The holding member mold frame 55 is placed against the abutment surface 56 a of the abutment plate 56 via the release paper 57 . The inner cross section of the holding member mold 55 has the same dimensions as the shape and size of the joint holding member 30 .

The joint holding member molding step is to form the joint holding member 30 on the abutment surface 56a in the holding member mold 55 and on the outer circumference of the plurality of conduit joints 20, 20, . A molding material 13 is introduced. As a result, the joint holding member 30 for holding and fixing the plurality of conduit joints 20, 20, . . . is solidified and molded.

In this embodiment, the joint holding member 30 includes an inner holding plate 31 that fixes the outer peripheries of the plurality of conduit joints 20, 20, . and an outer holding plate 32 that fixes the outer peripheries of the plurality of wire pipe joints 20, 20, . . . In this case, the molding process of the joint holding member includes the molding process of the inner surface side holding plate for molding the inner surface side holding plate 31, the filling material filling process for forming the space 33, and the outer surface side. A process of forming an outer side holding plate for forming the holding plate 32 is included.

As shown in FIG. 7, the forming process of the inner surface side holding plate is carried out on the abutment surface 56a in the holding member mold frame 55, and furthermore, on the plurality of conduit joints 20, 20, . A first molding material 13 is put into the outer periphery. As a result, the inner holding plate 31 is solidified. The plurality of conduit joints 20, 20, .

As shown in FIG. 8, in the filling material laying step, on the inner surface side holding plate 31 and on the outer circumference of the plurality of conduit joints 20, 20, . . . A removable filling material 59 is spread over the height dimension forming the space 33 .

As shown in FIG. 9, in the step of forming the outer surface side holding plate, the first forming material 13 is placed on the filling material 59 and on the outer periphery of the plurality of conduit joints 20, 20, . do. As a result, the outer holding plate 32 is solidified. are held and fixed by the outer holding plate 32 at a height position separated from the inner holding plate 31 by the distance 33 .

In the filling material removing step, as shown in FIG. 10, the holding member mold 55 is removed to remove the filling material 59 . As a result, a plurality of electrical conduit joints 20, 20, . do. The abutting plate 56 can be easily separated from the inner holding plate 31 by the release paper 57 .

As shown in FIG. 11, the joint holding member 30 includes a plurality of conduit joints 20, 20, . are arranged in a predetermined position and held.
In this case, since the joint holding member 30 forms the space 33 between the inner surface side holding plate 31 and the outer surface side holding plate 32, the workability is improved because the weight is reduced.

The piping box 10 is molded by incorporating the joint holding member 30 molded as described above into the piping box mold 50 . The manufacturing process of the piping box 10 includes a piping box formwork assembly process, a molding outer frame assembly process, and a piping box molding process.
12 and 13, the piping box formwork 50 is composed of an outer molding frame 51 and an intermediate molding frame 53. As shown in FIG. A side wall 51b of the molding outer frame 51 is formed in advance with a holding member opening 52 having a size into which the joint holding member 30 can be inserted.

As shown in FIG. 13, in the process of assembling the formwork for the piping box, the middle molding frame 53 is fixed to the bottom plate 51a of the outer molding frame 51. As shown in FIG. Next, the four side walls 51b, . The molding outer frame 51 is formed in a rectangular parallelepiped box shape with an open top by connecting adjacent side walls 51b, . . . , 51b.
Therefore, as shown in FIG. 13, the side wall portion 12 of the piping box 10 is formed by a space 54 between the side walls 51b, . be. 13, the bottom wall portion 11 of the piping box 10 has a height dimensional difference between the upper edge of the side walls 51b, . is formed in the space 54 of

As shown in FIGS. 14 and 15, the assembly process of the molding outer frame is such that the joint holding member 30 described above is installed in the inner openings 21, 21, . is inserted into the holding member opening 52 so as to be exposed on the inner surface of the piping box 10 .
For this purpose, the inner openings 21, 21, . . . of the plurality of conduit joints 20, 20, . Alternatively, another holding member opening may be formed in the molding intermediate frame 53, and the joint holding member 30 may be inserted into this holding member opening. Incidentally, the latter is better when the piping box 10 is a cylindrical box.

In the piping box molding process, the second molding material 14 for molding the piping box 10 is put into the space 54 between the molding outer frame 51 and the molding middle frame 53 to harden and mold the piping box 10 .
At this time, when the second molded material 14 of the piping box 10 is put into the space 33 between the inner side holding plate 31 and the outer side holding plate 32, the outer circumference of the plurality of conduit joints 20, 20, . Pour it in so that it spreads over. . . , so that the joint holding member 30 and the side wall portion 12 of the piping box 10 are further closely contacted and integrated. As a result, there is no boundary between the joint holding member 30 and the side wall portion 12 of the piping box 10, so that a so-called "water gap" is not formed, which is effective in completely preventing water leakage.
. . , 51b of the outer molding frame 51 and the top surface of the middle molding frame 53. is solidified and molded.

If the second molding material 14 is made of the same material as the first molding material 13, such as concrete, the joint holding member 30 is integrated with the piping box 10 in tighter contact, thereby completely preventing water leakage. Although it is desirable in that it is effective for

. , 51b of the molding outer frame 51 are rotated in a direction to open each other, and then the piping box 10 is removed upward from the molding middle frame 53. As shown in FIG. At this time, since the piping box 10 is in an upside down state with the opening facing downward, it is placed with the opening facing upward. As a result, as shown in FIGS. 1 and 2, the piping box 10 with conduit joints in which a plurality of conduit joints 20, 20, . . .

As described above, the method for manufacturing a piping box with conduit joints is such that even if one or a plurality of conduit joints 20, 20, . . . Since they are arranged in position and held and fixed to the joint holding member 30, it becomes easy to manufacture a made-to-order piping box 10. - 特許庁That is, when manufacturing the piping box 10 in which the conduit joint 20 to which the desired conduit 40 can be connected is embedded, it is possible to cope with productivity and cost.

Even if the outer shape of the piping box 10 is cylindrical, the molding outer frame 51 and the molding middle frame 53 are cylindrical, and the holding member openings 52 are formed in the outer peripheral side plates of the molding outer frame 51 . is previously formed, and the joint holding member 30 is embedded in the side wall portion of the outer periphery of the piping box 10 .

INDUSTRIAL APPLICABILITY The present invention has applicability in businesses related to the manufacture and sale of electric conduits, wiring work, construction business, civil engineering business, and the like.

REFERENCE SIGNS LIST 10 piping box with conduit joint 11 bottom wall 12 side wall 13 first molding 14 second molding 20, 20a, 20b conduit joint 21 inner opening 22 receptacle 30 joint holding member 31 inner side holding plate 32 outer side Holding plate 33 Intervals 40, 40a, 40b Conduit (FEP tube)
41 spigot 42a, 42b straight pipe joint 50 piping box mold 51 molding outer frame 51a bottom slab 51b side wall 52 holding member opening 53 molding middle frame 54 space 55 holding member mold 56 abutment plate 56a butt Contact surface 57 Release paper 58 Adhesive 59 Filler

Claims (3)

A method for manufacturing a piping box with conduit fittings in which one or more conduit fittings are embedded in a side wall of the piping box, comprising:
The conduit joint has an inner opening exposed to the inner surface of the piping box and a receptacle for attaching the conduit,
The piping box formwork for molding the piping box consists of an outer molding frame that forms the outer surface of the piping box, and a molding that is arranged inside the outer molding frame with an interval for forming the side wall of the piping box. Consists of a middle frame and
A surface aligning step of arranging the conduit joints in which the inner openings of the one or more conduit joints are abutted against the abutting surface of a flat abutting plate to arrange and temporarily fix them on substantially the same plane. When,
a formwork assembling step of abutting and arranging a holding member formwork surrounding the one or more conduit joints on the abutment surface of the abutment plate;
A first molding material for forming a joint holding member is put on the abutment surface in the holding member mold and on the outer circumference of the one or more conduit joints, and the one or more A step of forming a joint holding member for solidifying and molding the joint holding member for holding and fixing the conduit joint of
The outer frame for molding is preformed with a holding member opening for inserting the joint holding member, and the joint holding member is formed as described above so that the inner opening of the conduit joint is exposed to the inner surface of the piping box. a step of assembling a molding outer frame to be inserted into the holding member opening;
a piping box molding step of putting a second molding material for molding the piping box into the space between the molding outer frame and the molding middle frame to solidify and mold the piping box;
A method for manufacturing a piping box with a conduit fitting, comprising: The joint holding member includes an inner side holding plate that fixes the outer perimeter of the one or more conduit joints on the side of the inner opening, and a position on the outer side of the piping box spaced from the inner side holding plate. , and an outer surface side retaining plate that fixes the outer periphery of the one or more conduit joints,
In the molding step of the joint holding member,
An inner surface on which the first molding material is put on the abutment surface in the holding member mold and on the outer circumference of the one or more conduit joints to solidify and mold the inner surface side holding plate. a side holding plate forming step;
a filling material laying step of laying a removable filling material on the inner surface side holding plate and on the outer periphery of the one or more conduit joints to form a gap from the outer surface side holding plate; ,
an outer surface side holding plate forming step of putting the first molding material on the filling material and on the outer periphery of the one or more conduit joints and solidifying and molding the outer surface side holding plate;
A filler removal step of removing the filler spread in the filler spreading step;
The method for manufacturing a piping box with a conduit fitting according to claim 1 , characterized by comprising: 2. The method of manufacturing a piping box with a conduit joint according to claim 1, wherein the first molded material and the second molded material are made of the same material.

Images