JPH08178166A - Joint for piping - Google Patents

Abstract

PURPOSE: To provide a joint for piping capable of performing a work to effect connection to a piping on the building side even when a nipping jig is not mounted. CONSTITUTION: A joint 20 for a piping comprises an upper stream connection part 21 connected to the end part of a service pipe 2; a downstream connection part 22 connected to the piping side on the building side; a cylindrical drum part 23 wherein a communication passage 23a to intercommunicate the passages of the upper stream connection part 21 and the downstream connection part 22 is formed; an opening closing valve 24 screwed in a drum part 23 and arranged movably along a female screw part 23b; and a first cap body 25 with which the upper end opening part 23c of the drum part 23 is covered. In such a state that a piping on the building is not installed, the opening of the downstream connection part 22 is closed with a plug 26 and the downstream connection part 22 is covered with a second cap body 27. When a piping on the building side is arranged, the plug 26 and the second cap body 27 are removed and opening and closing valve 24 is opened.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a first pipe made of resin and a second pipe connected downstream of the first pipe in the fluid flow direction.
The present invention relates to a pipe joint interposed between the pipe and the pipe.

[0002]

2. Description of the Related Art In recent years, resin pipes made of polyethylene or the like have been used as gas pipes buried in the ground. This type of resin pipe is superior in corrosion resistance to steel pipes that have been conventionally used as gas pipes, so there is no electrical action under buried conditions, corrosion of acidic soil, etc., and chemical resistance. Because it is excellent, it is less affected by chemical substances,
Since it has flexibility, it has an advantage that it does not bend and break like a steel pipe, following the ground as it is, even when the ground changes or is improperly submerged during an earthquake.

Further, since the resin pipe has a restoring property, in order to temporarily shut off the gas at the time of gas construction or the like, the resin pipe is squeezed into a flat state until its inner surfaces come into close contact with each other by a predetermined clamping jig. It is also possible to prevent gas from passing through (so-called squeeze-off state), and by releasing the clamping operation by the clamping jig, the resin tube returns to its original shape and can be used without any problems after that. It also has the advantage that it can.

By the way, in a state where the building to which the gas is supplied has not been built yet and the piping on the building side has not been laid yet, as shown in FIG. A resin-made lead-in pipe 2 as a pipe is embedded with its front end closed. That is, in this case, the connection socket 4 into which the closing plug 3 is screwed is attached to the tip of the lead-in tube 2, and the connection socket 4 is
A position notification plate 6 is exposed and attached to the ground via a rod-shaped body 5 extending upward to notify the end position of the retractable pipe 2.

The building side pipe 7 as the second pipe
When laying, as shown by the phantom line in FIG.
In the state in which a part of the lead-in pipe 2 is held by the holding jig 8 to block the gas, the closing plug 3 is rotated to connect the socket 4 for connection.
After that, the building side pipe 7 was connected instead, and finally the holding operation by the holding jig 8 was released to make it possible to supply gas to the building side pipe 7 as shown in FIG.

In FIG. 4, 8a is a pair of nipping rollers provided in the nipping jig 8, 9 is a gutter provided along the road, and 10 is a pipe 7 installed on the building side. This is a meter for detecting the amount of gas used.

FIGS. 6 and 7 show a case where a closing socket 11 is provided at the end of the retracting pipe 2 instead of the connecting socket 4, and in this case, a part of the retracting pipe 2 is provided. With the holding jig 8 sandwiching the gas and cutting off the gas, the leading end of the lead-in pipe 2 is cut, and then the lead-in pipe 2 is connected to the building-side pipe 7 through the connection socket 12. ing.

[0008]

However, in recent years,
As shown in FIG. 8, it is performed in some areas to arrange the meter 10 close to the road side area so that the meter 10 can be visually recognized without entering the building side area.
In this case, since there is only a small distance L between the side groove 9 in the lead-in pipe 2 and the connection socket 4 or the closing socket 11, there is no space to attach the holding jig 8 to the lead-in pipe 2, and the gas There was a problem that the disconnection work could not be performed, and as a result, the connection work to the building side pipe 7 became difficult.

The present invention is intended to solve the above problems, and an object of the present invention is to provide a pipe joint which can be connected to a pipe on the building side without any trouble without attaching a holding jig. Is.

[0010]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides a structure in which a first pipe made of resin and a second pipe connected to a downstream side of the first pipe in a fluid flow direction are connected. And is connected to the first pipe in a state where the second pipe is not provided, and is connected to the second pipe after the second pipe is provided and is connected to the passage of the first pipe and the first pipe. A pipe joint for communicating the passage of the second pipe, the upstream joint being fused and connected to the end of the first pipe, and the downstream joint being connected to the second pipe. And a cylindrical body portion having a communication passage that connects the passage of the upstream side connecting portion and the passage of the downstream side connecting portion, and a communication passage that is screwed into the body portion and is disposed in the communication passage. And a communication position which is disposed outside the communication passage and communicates the passage of the first pipe and the passage of the second pipe. In those with a closing member to be moved.

[0011]

In the above structure, by arranging the opening / closing member in the body at the shut-off position when the second pipe is not provided, it is possible to prevent the fluid from leaking from the first pipe side to the outside. After the second pipe is provided and connected to the downstream side connecting portion, the passage of the first pipe and the passage of the second pipe are made to communicate by arranging the opening / closing member in the body at the communication position. be able to.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. Those having the same functions as those of the conventional one are designated by the same reference numerals, and the description thereof is omitted.

As shown in FIG. 1, the pipe joint 20 has an upstream side connecting portion 21 extending to one side and connected to an end portion of a lead-in pipe 2 as a first pipe, and another side side. A downstream side connecting portion 22 that is extended to the second side pipe and is connected to the building side piping 7 (see FIGS. 2 and 3) side, a passage of the upstream side connecting portion 21 and a passage of the downstream side connecting portion 22. Communication passage 23 for communicating with
A tubular body portion 23 formed with a and a female screw portion 23b formed on the inner surface of the upper portion of the body portion 23 are screwed into the body portion 23 and serve as an opening / closing member movably arranged along the female screw portion 23b. The opening / closing valve 24 and the first cap body 25 that covers the upper end opening 23 c of the body portion 23 are provided. Then, in a state where the building side pipe 7 is not provided yet, the open end of the downstream side connecting portion 22 is closed by the plug 26, and the downstream side connecting portion 22 is covered by the second cap body 27. Here, except for the opening / closing valve 24, all are made of polyethylene, and in this embodiment, the upstream side connecting portion 21, the downstream side connecting portion 22 and the body portion 23 are integrally formed.

The upstream connecting portion 21 has a heating wire 21a on the inner surface.
Is provided, and by energizing the heating wire 21a from the pair of terminals 21b provided so as to project upward,
The lead-in pipe 2 and the upstream side connecting portion 21 are heat-sealed and joined.

The lower end of the body portion 23 is bent and connected to the upstream connecting portion 21, and the trunk portion is branched at the central portion to which the downstream connecting portion 22 is connected.
Further, a female screw portion 23b is formed on the inner surface from the central portion to the upper portion, and a sealing packing 28 is provided on the outer peripheral surface of the upper portion.

The opening / closing valve 24 has a male screw portion 24a formed on the outer periphery of the upper portion, which is screwed into the female screw portion 23b of the body portion 23.
A rubber sealing member 24b is externally fitted to the lower end portion. Further, a rectangular concave portion 24c is formed on the upper surface portion, and the valve opening / closing tool 29 is engaged with the concave portion 24c to rotate the opening / closing valve 24.

The first cap body 25 has a seal packing 29 provided on the inner periphery of the upper portion thereof and an internal thread portion 25a formed on the inner periphery of the lower end portion thereof. The male screw portion 23d formed on the outer circumference of the portion 23 is screwed. Then, by screwing the first cap body 25, the seal packing 29
Is compressed and good sealing performance is maintained.

The second cap body 27 has a female screw portion 27a formed on the inner periphery of the opening end side thereof. The female screw portion 27a of the second cap body 27 is formed on the outer periphery of the downstream connecting portion 22 near the branch portion. It is screwed into the male screw portion 22a.
Then, by covering the downstream side connecting portion 22 with the second cap body 27, the downstream side connecting portion 22 is prevented from being exposed to the outside and becoming dirty.

Reference numeral 12 in FIGS. 2 and 3 is a connecting socket for connecting the downstream side connecting portion 22 of the pipe joint 20 and the building side pipe 7, and this connecting socket 12 is shown in FIG. Thus, the heating wire 12a is provided on the inner surface, and the heating wire 12a is energized from the pair of terminals 12b that are provided so as to project upward, so that the piping joint 20
The downstream side connection part 22 and the building side pipe 7 can be heat-sealed and joined.

In the above structure, when the building side pipe 7 is not yet laid, the opening / closing valve 24 is arranged at the cutoff position in the communication passage 23a shown in FIG. 1 to close the communication passage 23a of the body portion 23. . This prevents the gas flow path from the lead-in pipe 2 from being blocked by the pipe joint 20 and leaking the gas from the lead-in pipe 2 to the outside. The body 23
The upper end opening 23c of the seal packing 29 and the first
Since the passage is closed by the cap body 25 and the passage of the downstream side connecting portion 22 is closed by the plug 26, even if the shutoff function of the open / close valve 24 is incomplete, a pipe joint is used. Gas is reliably prevented from leaking from 20.

After that, when laying the building side pipe 7,
First, the second cap body 27 and the plug 26 are removed from the downstream side connecting portion 22, and then, as shown in FIGS. 2 and 3, the downstream side connecting portion of the pipe joint 20 in a state where the connecting socket 12 is exteriorly mounted. 22 and the pipe 7 on the building side are butted against each other, and the heating wire 12a of the connection socket 12 is energized to form the pipe joint 2
The downstream side connecting portion 22 of 0 and the building side pipe 7 are heat-sealed.

Next, the first cap body 25 is removed, a valve opening / closing tool 29 is engaged with the opening / closing valve 24, and the opening / closing valve 24 is rotated by the valve opening / closing tool 29 to open the opening / closing valve 24. Communication passage 23 shown in 3
a Move to a communication position outside. As a result, the body portion 23
The lead-in pipe 2 and the building-side pipe 7 communicate with each other through the communication passage 23a, and gas is supplied to the building side. After the opening / closing valve 24 is moved to the communicating position, the first cap body 25 is covered again to seal the body portion 23 from the upper end opening 23c side so that gas does not leak.

As described above, it is possible to easily carry out the work of shutting off the gas and the communication of the passage without attaching a holding jig, and it is not necessary to attach the holding jig. As shown in, even when the meter 10 is arranged close to the road side region, the gas shutoff work can be performed without any trouble.

In the above embodiment, the case where the heating wire 21a and the like are provided in the upstream side connecting portion 21 to directly connect to the service pipe 2 has been described, but the present invention is not limited to this, and the downstream side connecting portion 22 and Similarly, you may connect through a connection socket. Further, in the above embodiment, the case of using as a gas pipe is described, but it is also possible to use as a joint for other fluid pipes such as a water pipe.

[0025]

As described above, according to the present invention, as the pipe joint, the upstream side connecting portion which is fused and connected to the end portion of the first pipe and the second pipe side is connected. A cylindrical body having a downstream connecting portion, a communication passage communicating with the passage of the upstream connecting portion and the passage of the downstream connecting portion, and a screw inserted into the body and arranged in the communicating passage. A shutoff position for shutting off the communication passage and an opening / closing member arranged outside the communication passage and moved between a communication position for communicating the passage of the first pipe and the passage of the second pipe. , It is possible to cut off the fluid to the second pipe side and communicate the passage without any trouble without attaching a holding jig.
The connection work to the second pipe side can be performed easily and efficiently regardless of the position where the meter is arranged.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a pipe joint according to an embodiment of the present invention.

FIG. 2 is a diagram schematically showing a piping path connected using the same piping joint.

FIG. 3 is a cross-sectional view of the pipe joint when connected to a building side pipe.

FIG. 4 is a diagram schematically showing a piping path using a conventional piping joint.

FIG. 5 is a diagram schematically showing a piping path connected using a conventional piping joint.

FIG. 6 is a diagram schematically showing a piping path using another conventional piping joint.

FIG. 7 is a diagram schematically showing a piping path connected using another conventional piping joint.

FIG. 8 is a diagram schematically showing a piping path connected using a conventional piping joint.

[Explanation of symbols]

 2 Service pipe (first pipe) 7 Building side pipe (second pipe) 20 Pipe joint 21 Upstream side connection part 22 Downstream side connection part 23 Body part 23a Communication passage 23b Female thread part 24 Open / close valve (opening / closing member) 25 First cap body 26 Plug 27 Second cap body 28 Seal packing

Claims (1)

[Claims] 1. A state in which a first pipe made of resin and a second pipe connected to a downstream side of the first pipe in the fluid flow direction are interposed and no second pipe is provided. A pipe joint that is connected to the first pipe and is connected to the second pipe after the second pipe is provided to connect the passage of the first pipe and the passage of the second pipe. An upstream connecting portion that is fused and connected to an end portion of the first pipe, a downstream connecting portion that is connected to the second pipe side, a passage of the upstream connecting portion and a passage of the downstream connecting portion. A tubular body portion having a communication passage formed therein, and a cut-off position screwed into the body portion, disposed inside the communication passage to cut off the communication passage, and arranged outside the communication passage. A pipe joint provided with an opening / closing member that is moved between a communication position that communicates the passage of the pipe and the passage of the second pipe.