JP4219763B2 - Pipe connection structure to piping box - Google Patents

Description

The present invention is for connecting a tubular body such as a corrugated plastic pipe used to protect a wiring member such as a power cable, a communication cable, an optical cable, etc. installed in a basement to a piping box such as a handhole or a manhole. It relates to a pipe connection structure to a piping box.

Conventionally, as a pipe connection structure to a piping box for connecting a pipe body such as a corrugated plastic pipe used to protect wiring members such as power cables and communication cables to piping boxes such as hand holes and manholes. A receiving joint that is inserted into an opening formed in the wall of the piping box and fixed to the wall, a receiving joint that is inserted into the inner surface of one side of the joint body, and an inner surface of the other side of the joint body In a tube body connection structure to a piping box having a retainer portion for holding an end portion of a tube body, and a pipe joint for connecting the tube body to the receiving joint, the retainer portion on one side of the pipe joint and the receiving joint An adhesive (water-stopping member) is provided between the pipe and a rubber ring (water-stopping member) is provided on the inner peripheral surface of the retainer on the other side of the pipe joint facing the end of the tubular body. (See Patent Document 1) ).

Japanese Patent Laid-Open No. 9-284966 (paragraph numbers 0010 to 0012 and FIGS. 1 to 3 in the Detailed Description of the Invention)

In the pipe connection structure to the pipe box having the above configuration, when an external force is applied to the pipe due to thermal expansion / contraction of the pipe by heat cycle, subsidence (ground) settlement, earthquake, etc., the pipe is bent and deformed,
There is a gap between the pipe joint, the receiving joint and the fitting portion of the pipe body and the water stop member, and the gap tends to expand. If it does so, the water stop performance of the said water stop member provided in these fitting parts will fall, and there is a possibility that water, such as rain water and groundwater, may invade into a piping box via a receiving joint from the gap of the above-mentioned fitting parts Therefore, improvement was desired. The contact pressure between each other decreases, and it is easy to create a gap between them

The present invention was born in view of the above, and provides a tubular body connection structure to a piping box that has excellent water stop performance that can reliably and easily prevent water from entering the piping box. It is the purpose.

The present invention includes a receiving joint that is inserted into an opening formed in a wall of a piping box and is fixed to the wall, a receiving joint that is inserted into an inner surface on one side of the joint body, and an inner surface on the other side of the joint body In a pipe body connection structure to a piping box having a retainer portion for holding an end portion of a pipe body inserted into a pipe joint, and a pipe joint for connecting the pipe body to the receiving joint, the receiving joint in the retainer portion of the pipe joint And an expansion body which expands when moisture is absorbed is integrally formed on the inner peripheral surface facing the end of the pipe body, and the receiving joint is formed at the rear end of the opening formed in the wall of the piping box. Is inserted and fixed so as not to protrude from the outer wall surface of the wall of the piping box, and an enlarged-diameter groove for receiving the receiving joint side of the pipe joint is provided on the inner peripheral surface of the opening of the wall body on the pipe joint side. Formed and tube body through pipe fitting to the receiving fitting When connected, the receiving joint side of the pipe joint is inserted into the enlarged-diameter groove of the opening, and each connecting part of the pipe body, pipe joint, receiving joint, and piping box wall body has a spiral structure, and the pipe body and pipe joint, in which the pipe joint and the receiving joint, each connection receiving fitting and the pipe box walls is characterized that you have made in screwed the spiral structure.

According to the tube connecting structure to piping box of the present invention, thermal expansion and contraction due to heat cycle in the tube body, the formation (ground) subsidence, an external force is applied by the earthquake or the like, the pipe body is bent deformation, said fitting Even if rainwater, groundwater, or other water enters through this gap, a gap is created or expanded between the fitting and the fitting part of the pipe and the expansion body, so that it can be integrated with the retainer of the pipe joint. Since the formed expansion body absorbs moisture and expands, and comes into close contact with the fitting portion with a contact pressure necessary for water stopping, the airtightness and liquid tightness of the fitting portion can be obtained. Therefore, it is possible to reliably prevent water from entering the piping box through the receiving joint from the gap of the fitting portion of the pipe joint.

In addition, when fitting a pipe joint to a fitting and a pipe body, the expansion body of the pipe joint normally does not absorb moisture, so it does not expand and shrinks in the radial direction. Mounting is easy and the workability of the tube connection structure can be improved.

According to the tube connecting structure to piping box of the present invention, receiving the rear end of the joint does not protrude from the outer wall surface of the wall, that joint received during laying and transport into the ground or the like of the piping boxes corruption In addition, since the piping box is not bulky and compact, a space for transporting and storing the piping box to a laying site or the like is reduced, and the construction cost of the pipe connecting structure can be reduced. In addition, since the receiving joint side of the pipe joint is inserted into the enlarged groove in the opening of the wall body and held by the wall body, the strength against external force acting on the pipe body is increased, and the water stoppage of the pipe connection structure is increased. The performance can be further improved.

Next, the best mode for carrying out the present invention will be described with reference to the drawings. FIG. 1 shows the first aspect of the present invention.
It is a half incision side view showing an embodiment. The pipe connection structure to the piping box of this embodiment is
As shown in the figure, the inner opening edge 4 formed in the wall body 1 of the piping box has an opening 3 that opens outward in a bell mouth shape, and the rear end is outward from the outer wall surface of the wall body 1. A receptacle having a bell mouth 6 which is inserted so as to protrude and is fixed to the wall body 1 and made of, for example, a corrugated plastic tube having a helical corrugated shape made of polyethylene and integrally formed at the front end by molding. A pipe for connecting a pipe body 7 made of a corrugated plastic pipe having a helical waveform made of polyethylene, for example, used for protecting a wiring member such as a power cable and a communication cable to the joint 5 and the receiving joint 5 And a joint 9.

If the bell mouth 6 is integrally formed at the front end of the receiving joint 5 as described above, the inner diameter of the receiving joint 5 will not be reduced. Therefore, after installing the pipe body, the test rod before passing through the wiring member was used. During the line test, there is no possibility that the test rod may be held on the inner surface of the receiving joint 5 and cause a passage failure, which is advantageous for the wiring test. However, the bell mouth 6 is separate from the receiving joint 5 inside the receiving joint 5. May be inserted. Further, the receiving joint 5 includes an outer wall surface 2 in the vicinity of the opening 3 of the wall 1 of the piping box.
By attaching and pressing the sealing material holder 13 via the sealing material 11 such as packing, putty, water swellable water blocking material, etc., the outer peripheral surface of the receiving joint 5 and the inner peripheral surface of the opening 3 of the wall 1 Water is treated to prevent rainwater, groundwater, and other water from entering the piping box through the gaps between them. In addition,
Instead of providing the sealing material 11 and the sealing material holder 13, the outer peripheral surface of the receiving joint 5 and the opening 3
A water stop member (not shown) such as a mortar, epoxy resin or other room temperature curable putty is interposed between the receiving joint 5 and the opening 3 of the wall body 1 to stop water. Good.

As shown in FIG. 2, the pipe joint 9 includes, for example, a receiving joint 5 and a joint body 15 that are screwed into an inner surface of one side of a joint body 15 made of a corrugated plastic pipe having a helical waveform made of polyethylene. An inner peripheral surface having a retainer portion 17 that holds an end portion of the tube body 7 that is screwed into the inner surface on the side, and has a spiral waveform facing the end portions of the receiving joint 5 and the tube body 7 in each retainer portion 17. In addition, an expansion body 19 that expands when moisture is absorbed is integrally formed.

The expansion body 19 is composed of, for example, a mixture of a nonwoven fabric, a highly water absorbent resin, and a thermoplastic resin. Since the temperature of the expanded body 19 becomes high during molding, the nonwoven fabric is excellent in heat resistance, for example, a fiber such as polyethylene terephthalate (PET). In addition, as the highly water-absorbent resin, for example, a fiber, a powder, a sheet, or the like can be used as appropriate. Since the superabsorbent resin has a role of expanding the expandable body 19, it is more preferable to use a fibrous material to be mixed with the nonwoven fabric. However, a powdered material may be mixed between the nonwoven fabric fibers. Good. In the case of using a sheet-like superabsorbent resin, a sandwich structure is preferably sandwiched between nonwoven fabrics. The thermoplastic resin is formed of a material that melts at the time of molding, and, for example, is appropriately mixed as a fiber. The mixing ratio of the nonwoven fabric, the highly water-absorbent resin and the thermoplastic resin is set, for example, to about 4: 6 to 2: 8 for the nonwoven fabric and the highly water-absorbent resin, and the amount of the thermoplastic resin may be small.

Note that the shape of the joint body 15 of the pipe joint 9 is not limited to the corrugated pipe, but if the corrugated pipe is configured in accordance with the shape of the pipe body 7, the receiving joint 5 and the pipe body 7. This is desirable because it can be easily plugged in. Similarly, the shape of the receiving joint 5 is preferably composed of the corrugated pipe, but is not limited to this shape. When the shape of the receiving joint 5 is constituted by a smooth pipe, it is desirable that the inner peripheral surface of the retainer portion 17 on one side (receiving joint side) of the pipe fitting 9 is constituted by a smooth surface.

The tube connection structure of the first embodiment is configured as described above. There are various methods for assembling this pipe connection structure. For example, in a factory, the receiving joint 5 is inserted into the opening 3 formed in the wall 1 of the piping box in advance and fixed in a water-stopped state. Keep it. Next, this piping box is transported to the laying site and disposed in a piping box underground pit formed at the laying site. Thereafter, the end portions of the receiving joint 5 and the pipe body 7 are inserted into and held in the retainer portion 17 of the pipe joint 9, thereby connecting the pipe body 7 to the receiving joint 5 and finishing the assembly of the pipe connecting structure. .

According to the tubular body connection structure of the present embodiment, external force is applied to the tubular body 7 due to heat expansion / contraction due to heat cycle, formation (soil) settlement, earthquake, etc., the tubular body 7 is bent and deformed, etc. Even if water such as rain water or groundwater enters through the gap by forming or widening a gap between the fitting part of the joint 5 and the pipe body 7 and the expanding body 19, the retainer part of the pipe joint 9 Since the expansion body 19 formed integrally with the water 17 absorbs moisture and expands, and tightly adheres to the fitting portion with a contact pressure necessary for water stopping, airtightness and liquid tightness of the fitting portion can be obtained. Therefore, it is possible to reliably prevent water from entering the piping box through the receiving joint 5 from the gap of the fitting portion of the pipe joint 9.

In addition, when fitting the pipe joint 9 to the joint 5 and the pipe body 7 and mounting them, the expansion body 19 of the pipe joint 9 normally does not absorb moisture and therefore does not expand and shrinks in the radial direction. Therefore, the fitting of the pipe joint 9 is easy, and the workability of the pipe connecting structure can be improved.

FIG. 3 is a half-cut side view showing a second embodiment of the present invention. As shown in the figure, the pipe connection structure to the piping box of the present embodiment has the receiving joint 5 at the opening 3 formed in the wall 1 of the piping box, and the rear end of the piping box wall. A cylindrical shape that is inserted and fixed so as not to protrude from the outer wall surface 2 of the body 1 and that receives the receiving joint 5 side of the pipe joint 9 on the inner peripheral surface of the opening 3 of the wall body 1 on the pipe joint 9 side. When the enlarged groove 21 is formed and the pipe body 7 is connected to the receiving joint 5 via the pipe joint 9, the receiving joint 5 side of the pipe joint 9 is connected to the enlarged groove 2 of the opening 3.
1 is a structure to be inserted into 1.

In the case shown in FIG. 3, the receiving joint 5 is inserted so that the rear end thereof is located at a portion drawn from the outer wall surface 2 of the wall body 1 to the inside of the opening 3 (inside the piping box) by a predetermined length. However, it may be inserted so that the rear end thereof is located at a portion substantially matching the outer wall surface 2 of the wall body 1. That is, it is only necessary that the rear end of the receiving joint 5 is inserted and fixed so as not to protrude from the outer wall surface 2 of the wall body 1.

The receiving joint 5 in this embodiment is water-stopped by interposing a water-stopping member (not shown) such as mortar, epoxy resin or other room temperature curable putty between this and the opening 3, for example,
Water such as rainwater or groundwater does not enter the piping box from the gap between the outer peripheral surface of the receiving joint 5 and the inner peripheral surface of the opening 3 of the wall 1. In addition, a water-stopping treatment is performed between the receiving joint 5 and the opening 3 of the wall body 1 by interposing a water-stopping member (not shown) such as a room temperature curable putty between the outer peripheral surface of the receiving joint 5 and the opening 3. Instead of doing this, although not shown in the drawing, the outer peripheral surface of the receiving joint 5 is attached to and pressed against the outer wall surface 2 near the opening 3 of the wall 1 of the piping box via the sealing material 11. You may make it water-stop treatment so that rain water, groundwater, etc. may not penetrate | invade into a piping box from the clearance gap between the internal peripheral surfaces of the opening part 3 of the wall body 1. FIG. Since other configurations are substantially the same as those of the first embodiment, description thereof is omitted.

According to the pipe connection structure of the second embodiment, the rear end of the receiving joint 5 does not protrude from the outer wall surface 2 of the wall 1, so that the receiving joint 5 is damaged during installation or transportation of the piping box to the ground. In addition, since the piping box is not bulky and compact, a space for transporting and storing the piping box to a laying site or the like is reduced, and the construction cost of the pipe connecting structure can be reduced. Moreover, since the receiving joint 5 side of the pipe joint 9 is inserted into the diameter-enlarged concave groove 21 of the opening 3 of the wall body 1 and is held by the wall body 1, the strength against the external force acting on the pipe body 7 is increased. The water stop performance of the tube connection structure can be further improved.

It is a half incision side view which shows 1st Embodiment of this invention. It is an expansion perspective view which shows the pipe joint which is the main structures of the pipe body connection structure of FIG. It is a half incision side view which shows 2nd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Wall body of piping box 2 Outer wall surface 3 Opening part 4 Inner opening edge 5 Receiving joint 6 Bell mouth 7 Pipe body 9 Pipe joint 11 Sealing material 13 Sealing material holder 15 Joint main body 17 Retainer part 19 Expanding body 21 Expanding concave groove

Claims (1)

A receiving joint that is inserted into an opening formed in the wall of the piping box and fixed to the wall, a receiving joint that is inserted into one inner surface of the joint body, and a pipe that is inserted into the other inner surface of the joint body In a pipe connection structure to a piping box having a retainer part for holding an end of the body and having a pipe joint for connecting the pipe body to the receiving joint, the receiving joint and the pipe body of the retainer part of the pipe joint An expansion body that expands when moisture is absorbed is integrally formed on the inner peripheral surface facing the end portion, and the receiving joint is formed in the opening formed in the wall body of the piping box, and the rear end thereof is the piping box. The wall body is inserted and fixed so as not to protrude from the outer wall surface, and an enlarged-diameter groove for receiving the receiving joint side of the pipe joint is formed on the inner peripheral surface of the opening of the wall body on the pipe joint side. A pipe was connected to the joint via a pipe joint. The pipe joint receiving joint side is inserted into the diameter-enlarged concave groove of the opening, and each connecting portion of the pipe body, pipe joint, receiving joint, and piping box wall body has a spiral structure, pipe joint, pipe joint and the receiving joint, receiving pipe connection structure for piping boxes each connection fitting and the pipe box walls is characterized that you have made in screwed the spiral structure.

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