JP4540459B2 - Protection structure for branch pipe joint and its laying method - Google Patents

Description

  The present invention relates to a protective structure for a branch pipe joint for branch connection of a second pipe to a first pipe, and a protective structure laying method for laying the protective structure.

  In recent years, gas pipes for supplying gas to homes, etc. have been installed easily in narrow areas, and in order to reduce piping work time, flexible pipes made of stainless steel or the like through which gas flows are made of polyethylene or the like. In some cases, a flexible pipe inserted into a CD tube (Combined Duct: a kind of synthetic resin flexible tube) is used.

  Such a gas pipe may be branched using a branch pipe joint, for example, at a portion buried in the ground in order to increase the number of gas supply locations.

  A branch pipe joint for branching a pipe such as the gas pipe as described above is known as a T-shaped pipe joint or the like, and in a form intersecting with the first pipe at a cut portion of the first pipe. It is comprised so that the said 2nd piping may be connected.

  When branching pipes with branching joints, especially when branching gas pipes at underground pipes, to prevent corrosion and damage due to impacts at the joints with the branching joints In some cases, a protective structure for protecting the branch pipe joint from the outside is installed.

  Therefore, as a protection structure for branch pipe joints, a cover body that can be divided into upper and lower parts with a plane passing through the pipe axis of each pipe connected to the branch pipe joint as a boundary, 2. Description of the Related Art A protection structure is known that is configured to fix a top and bottom of a cover body by screwing a cap provided on each pipe side to a screw portion formed by sandwiching and combining the top and bottom of the cover body. (For example, see Patent Document 1).

Japanese Utility Model Publication No. 7-35879

In the protective structure described in Patent Document 1, since the cover body can be divided into two parts, the cover body has a divided part that is exposed to the outside over a relatively wide range, and water or the like enters the divided part. In order to prevent this, it is necessary to employ a complicated configuration in which a sealing material is interposed in the divided portion. Such a complicated structure causes an increase in cost, and further requires complicated work for interposing a sealing material in the divided portion.
In addition, even if the cover body that can be divided vertically and the sealing material interposed in the divided part of the cover member are slightly deformed due to secular change or the like, a gap is easily formed in the divided part. There is concern about the penetration of water or the like into the cover member.

  The present invention has been made in view of the above-mentioned problems, and the object thereof is good with a simple structure with respect to a branch pipe joint for branching a pipe such as a gas pipe buried in the ground. The object of the present invention is to provide a protective structure that can prevent and protect water and the like and can be easily laid, and a method for laying the protective structure.

The protection structure for a branch pipe joint according to the present invention for achieving the above object is a protection structure for a branch pipe joint for branching a second pipe to a first pipe,
The branch pipe joint is configured as a mechanical joint for connecting the upstream side and the downstream side of the first pipe by insertion in the pipe axis direction of the first pipe,
A cylindrical first cylindrical part surrounding the first pipe, and a cylindrical second cylindrical part branched from the first cylindrical part and surrounding the second pipe A configured body member;
An annular shape that is provided at each opening end that opens to both ends of the first cylindrical portion and the end of the second cylindrical portion, and covers an open portion that extends from the opening end to the outer surface of the pipe. A cover member;
In a direction perpendicular to the tube axis of the first pipe, the second pipe is connected to the one side by insertion and the other side is screwed to the branch pipe joint. And a plug for connecting the branch pipe joint,
An inner diameter of the first cylindrical portion of the main body member is set to be equal to or longer than a length of the branch pipe joint in a direction orthogonal to the pipe axis of the first pipe.

  According to the first characteristic configuration described above, a protection structure that can prevent and protect water and the like from entering the pipe joint for branching with a simple structure and can be easily installed is realized. can do.

In particular, in a direction perpendicular to the tube axis of the first pipe, the second pipe is branched from the second pipe in a state where the second pipe is connected to one side by insertion and the other side is screwed to the branch pipe joint. And a plug for connecting the pipe joint, and the main body member has a relatively simple configuration including the first cylindrical portion and the second cylindrical portion, and the first cylinder. By setting the inner diameter of the shape part to be equal to or longer than the length of the branch pipe joint in the direction orthogonal to the pipe axis of the first pipe, the main body member is set on the upstream side or the downstream side of the first pipe. It is attached in advance in a form retracted from the connecting portion connected by the branch pipe joint, and then the upstream side and the downstream side of the first pipe are connected to the branch pipe joint and the second pipe is removed. In this state, the retracted main body member is separated in the first cylindrical portion. In the form of use fitting passes, by sliding the branching pipe joint side, it can be laid in a position to easily protect the branching pipe joint.

  Furthermore, by providing the cover member, it covers the open part formed between the opening end of the main body member and the outer surface of each pipe, and prevents the entry of water or the like into the branch fitting side. Furthermore, since the posture of the portion that contacts the opening end of the main body member with respect to the portion of the cover member that contacts the outer surface of the pipe is maintained, the main body member can be improved with respect to the pipe. Can be supported.

  According to a second characteristic configuration of the protection structure for a branch pipe joint according to the present invention, the cover member has a cylindrical main body-side connection portion that is externally fitted to the opening end portion, and a cylindrical shape that is externally fitted to the pipe. The pipe side connection part and the taper-shaped taper part which connects between the main body side connection part and the pipe side connection part.

  According to the second characteristic configuration, by forming the cover member in a shape that connects the main body side connection portion and the pipe side connection portion by the taper portion, the taper portion that is relatively difficult to deform, The opening end of the main body member is inserted into the pipe-side connecting portion that contacts the outer surface into which the pipe is inserted, and the posture of the main body-side connecting portion that contacts the outer surface can be maintained better. In contrast, the main body member can be supported better.

  A third characteristic configuration of the protective structure for a branch pipe joint according to the present invention is that the cover member is made of a soft plastic.

  According to the third feature, the cover member is made of soft plastic, so that the opening end of the main body member is fitted into the main body side connection portion of the cover member in an interference-fitted state or the like. The pipe can be fitted into the pipe connection portion in an interference-fitted state, and the fitting work can be facilitated while satisfactorily preventing water and the like from entering the branch fitting.

  The fourth characteristic configuration of the branch pipe joint protecting structure according to the present invention is that the pipe is a flexible gas pipe buried in the ground.

  According to the fourth characteristic configuration described above, the protective structure having the above-described simple structure can be applied to the branch pipe joint that branches the flexible gas pipe buried in the ground for the purpose of increasing the gas supply location. Can be laid easily.

A branch pipe joint protective structure laying method according to the present invention is for branching pipes for branching having the above-described first to fourth characteristic configurations with respect to a branch pipe joint for branching a second pipe to a first pipe. A protective structure laying method for laying a protective structure for a pipe joint, characterized in that each cover member is in a state in which the first pipe and the second pipe are removed from the branch pipe joint. Is attached to the upstream side and the downstream side of the first pipe and the second pipe side in a form in which the pipe is inserted, and the main body member is attached to the upstream side or the downstream side of the first pipe. Attaching the first pipe to the first tubular part in a form to be inserted, and retracting the main body member from a connection part to which the branch pipe joint is attached,
With the upstream and downstream sides of the first pipe connected to the branch pipe joint, the retracted main body member is slid to the branch pipe joint side with the second pipe removed. Let
Connecting the second pipe through the second tubular portion of the main body member to the pipe joint for branching;
Each of the cover members is connected to an opening end portion of the main body member.

  That is, in the protection structure having the first to fourth characteristic configurations described above, the inner diameter of the first cylindrical portion is equal to or longer than the length of the branch pipe joint in the direction orthogonal to the tube axis of the first pipe. Therefore, according to the laying method of this characteristic configuration, the main body member is attached in advance in a form in which the main body member is retracted from the connecting portion connected to the upstream side or the downstream side of the first pipe by the branch pipe joint. After that, the main body member that has been retracted in the state where the upstream side and the downstream side of the first pipe are connected to the branch pipe joint and the second pipe is removed is used as the first tubular portion. The branch pipe joint can be slid to the branch pipe joint side so that the branch pipe joint can be easily laid at a position where the branch pipe joint is protected.

  Further, by connecting the cover member to the main body member slid to the branching ring joint side, an opening portion formed between the opening end portion of the main body member and the outer surface of each pipe by the cover member. The position of the portion that contacts the opening end of the main body member with respect to the portion of the cover member that contacts the outer surface of the pipe can be prevented by covering the branch pipe joint with water. Therefore, the main body member can be favorably supported with respect to the piping.

  A further characteristic configuration of the branch pipe joint protective structure laying method according to the present invention is that a waterproof tape for preventing water ingress is wound between the opening end of the main body member and the cover member. is there.

  That is, between the opening end portion of the main body member and the cover member, the waterproof tape is wound as described above, thereby reliably preventing water from entering the branch fitting side through the waterproof tape. Further, the waterproof tape can further strengthen the connection between the opening end of the main body member and the cover member.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a branch pipe joint protecting structure and a laying method thereof according to the present invention will be described with reference to the drawings.
FIG. 1 shows a state in which a protective structure is laid on the branch pipe joint, and FIGS. 2 to 4 show a flow of a method for laying the protective structure on the branch pipe joint.

  As shown in FIG. 1, a branch pipe joint 10 for branching and connecting a second pipe 2 to a first pipe 1 is an upstream side 1 a of the first pipe 1 formed by cutting the first pipe 1. And the downstream side 1b are connected so as to be opposed to each other on a straight line, and the second pipe 2 is connected in a form intersecting (for example, orthogonal to) the first pipe 1 at the connecting portion. It is configured.

  Further, the branch pipe joint 10 is configured as a mechanical joint that can be easily connected to the upstream side 1a and the downstream side 1b of the first pipe 1 by simply inserting them. In the case of connecting one plug 2 at a right angle to the first pipe 1, the plug 11 that can be connected by simply inserting it is screwed together. The branch pipe joint 10 is configured as a so-called T-shaped pipe joint.

  The first pipe 1 and the second pipe 2 are flexible gas pipes embedded in the ground, and the gas pipes are made of, for example, a flexible pipe made of stainless steel or the like through which a gas flows inside made of polyethylene. It is comprised in the form inserted into a CD tube.

  A protective structure 20 that is laid on such a branch pipe joint 10 and prevents damage due to water intrusion of the connection portion by the branch pipe joint 10 due to water intrusion or the like is provided with the main body member 21. The cover member 24 is provided, and the detailed structure thereof will be described below.

  The main body member 21 includes a cylindrical first cylindrical part 22 that surrounds the first pipe 1, and a cylindrical first part that branches from the first cylindrical part 22 and surrounds the second pipe 2. The two cylindrical portions 23 are relatively simple. As such a main body member 21, a “90 ° Y” shape of “rigid vinyl chloride pipe joint for drainage” defined in Japanese Industrial Standard (JIS K6739) can be used.

  Further, the length of the branch pipe joint 10 in the direction in which the inner diameter D of the first tubular portion 22 of the main body member 21 is orthogonal to the tube axis of the first pipe 1 (hereinafter referred to as the orthogonal direction). Is set to H or higher.

  Therefore, although details will be described later, when the protective structure 20 is laid on the branch pipe joint 10, the main body member 21 is connected to the upstream side 1 a or the downstream side 1 b of the first pipe 1 as shown in FIG. 2. Are attached in advance in a form retracted from the connecting portion connected by the branch pipe joint 10, and later, as shown in FIG. 3, the upstream side 1 a of the first pipe 1 with respect to the branch pipe joint 10 and In a state where the downstream pipe 1 is connected and the second pipe 2 is removed, the main body member 21 that has been retracted is passed through the first tubular portion 22 through the branch pipe joint 10. It can be slid to the branch pipe joint 10 side and can be laid at a position where the branch pipe joint 10 is easily protected.

  Further, the radius d of the inner diameter D of the first tubular portion 22 of the main body member 21 is set to the side where the second pipe 2 is connected from the pipe axis of the first pipe 1 of the branch pipe joint 10 in the orthogonal direction. Is set to be smaller than the length h to the end of the second pipe joint 10 in the state in which the tube axis of the first tubular portion 22 and the tube axis of the first pipe 1 coincide with each other. Since the end portion on the side to which the pipe 2 is connected is inserted into the second cylindrical portion 23, the operator's hand passes the second tubular portion 23 through the branch pipe joint 10. The second pipe 2 is easily attached to and detached from the branch pipe joint 10.

  The cover member 24 is provided at each of open end portions 22 a and 22 b that open at both ends of the first cylindrical portion 22 and an open end portion 23 a that opens at the end of the second cylindrical portion 23. Each of the cover members 24 is formed in an annular shape covering an open portion extending from the open end portions 22a, 22b, and 23a to the outer surfaces of the pipes 1 and 2. Therefore, the open portion is covered by the cover member 24, and water or the like can be prevented from entering the branch pipe joint 10 side. Further, the posture of the portion of the cover member 24 that contacts the open ends 22a, 22b, and 23a of the main body member 21 is maintained with respect to the portion of the cover member 24 that contacts the outer surface of the piping 1, 2, so On the other hand, the main body member 21 is favorably supported.

  Further, the cover member 24 includes a cylindrical main body side connecting portion 25 that is externally fitted to the open end portions 22a, 22b, and 23a, a cylindrical pipe side connecting portion 26 that is externally fitted to the pipes 1 and 2, The main body side connection portion 25 and the pipe side connection portion 26 are composed of a tapered portion 27 (ie, a state in which the diameter gradually decreases in a conical shape). Therefore, since the taper portion 27 is relatively difficult to deform, the open end portions 22a and 22b of the main body member 21 with respect to the pipe side connection portion 26 into which the pipes 1 and 2 are inserted and abut on the outer surfaces of the pipes 1 and 2 , 23a is inserted, and the posture of the main body side connecting portion 25 that abuts the outer surface of the open end portions 22a, 22b, 23a is maintained well, and the main body member 21 is supported better with respect to the pipes 1,2. .

Further, the inner diameter of the main body side connecting portion 25 of the cover member 24 is set to be the same or slightly smaller than the outer diameter of the open end portions 22 a, 22 b, 23 a of the main body member 21. Open ends 22a, 22b, and 23a are inserted into the heel.
Similarly, the inner diameter of the pipe-side connecting portion 26 of the cover member 24 is set to be the same or slightly smaller than the outer diameter of the pipes 1 and 2, and the pipes 1 and 2 are fitted into the pipe-side connecting portion 26. Will be.

  Further, since the cover member 24 is made of soft plastic such as soft vinyl chloride, the fitting operation of the opening end portions 22a, 22b, 23a to the main body side connection portion 25 and the piping 1, The fitting operation of No. 2 becomes easy, and furthermore, the fitting portions are closed and the gap between the fitting portions is made as small as possible, so that water or the like can be prevented from entering the branch fitting 10 side. Yes.

Further, a waterproof tape 28 is wound between the opening end portions 22a, 22b, 23a of the main body member and the main body side connection portion 25 of the cover member 24 so as to prevent water from entering. Intrusion of water or the like to the pipe joint 10 side is further prevented.
Further, in order to prevent the waterproof tape 28 from being damaged, a self-shrink tape may be wound around the waterproof tape 28 although illustration is omitted.

  Next, details of a protective structure laying method for laying the protective structure 20 on the branch pipe joint 10 will be described with reference to FIGS.

  First, as shown in FIG. 2, with the first pipe 1 and the second pipe 2 removed from the branch pipe joint 10, the respective cover members 24 are connected to the upstream side 1 a of the first pipe 1. The pipes 1 and 2 are attached to the downstream side 1b and the second pipe 2 side in such a manner that they are inserted into the pipe-side connecting portion 26.

  Next, the main body member 21 is attached to the downstream side 1b (upstream side 1a) of the first pipe 1 in such a form that the first pipe 1 is inserted into the first tubular portion 22, and further The main body member 21 is retracted from the connecting portion so that the connecting portion to which the branch pipe joint 10 is attached is exposed.

Next, as shown in FIG. 3, the main body that has been retracted with the upstream pipe 1a and the downstream pipe 1b connected to the branch pipe joint 10 and the second pipe 2 removed. The member 21 is slid to the branch pipe joint 10 side in a state where the member 21 is displaced slightly upward (direction toward the second pipe 2 side).
Here, since the inner diameter D of the first tubular portion 22 of the main body member 21 is set to be equal to or longer than the length H of the branch pipe joint 10, the branch pipe joint 10 can be easily attached to the first tubular member 10. The inside of the cylindrical part 22 can be passed.

  Next, as shown in FIG. 4, the second pipe 2 is connected to the branch pipe joint 10 through the second cylindrical portion 23 of the main body member 21. Here, the inner diameter of the second cylindrical portion 23 of the main body member 21 is set to a size that allows the second pipe 2 to be easily connected.

  Further, the radius d of the inner diameter D of the first cylindrical portion 22 of the main body member 21 is the side where the second pipe 2 is connected from the pipe axis of the first pipe 1 of the branch pipe joint 10 in the orthogonal direction. Therefore, the end of the branch pipe fitting 10 on the side to which the second pipe 2 is connected is inserted into the second cylindrical portion 23. Thus, the second pipe 2 can be easily attached to and detached from the branch pipe joint 10.

  Next, each cover member 24 is slid to the opening end portions 22a, 22b, and 23a side of the main body member 22, and the main body side connection portion 25 of the cover member 24 is externally fitted to the opening end portions 22a, 22b, and 23a. The protective structure 20 is installed on the branch pipe joint 10 by wrapping the waterproof tape 28 as described above as appropriate so as to close the gap between the open end portions 22a, 22b, 23a and the main body side connection portion 25. Complete.

  In the above-described embodiment, the protective structure 20 according to the present invention is applied to a branch pipe joint that branches and connects one second pipe 2 to the first pipe 1. The protective structure 20 may be applied to a cross-shaped branch pipe joint that connects, for example, two second pipes 2 to the first pipe 1. In this case, the main body member has a shape in which the first cylindrical portion and the second cylindrical portion intersect each other in a cross shape, and the four opening end portions formed at both ends of each cylindrical portion are provided. A cover member will be provided.

  In the above embodiment, the cover member 24 is configured to connect the main body side connection portion 25 and the pipe side connection portion 26 with the taper portion 27, but the taper portion 27 is connected to the first pipe 1. You may comprise as an annular part orthogonal to a pipe axis.

  The present invention particularly prevents and protects water from entering with a simple structure for branching pipe joints for branching pipes such as gas pipes buried in the ground. It can be applied as a protective structure and a laying method thereof.

Schematic configuration diagram of protection structure for branch pipe joints The figure explaining the laying method of the protection structure of the pipe joint for branch The figure explaining the laying method of the protection structure of the pipe joint for branch The figure explaining the laying method of the protection structure of the pipe joint for branch

Explanation of symbols

1: 1st piping 2: 2nd piping 10: Pipe fitting 20 for branching: Protection structure 21: Main body member 22: 1st cylindrical part 23: 2nd cylindrical part 22a, 22b, 23a: Open end Portion 24: Cover member D: Inner diameter H of first tubular portion H: Length of branch pipe joint

Claims (6)

A branch pipe joint protective structure for branching and connecting a second pipe to a first pipe,
The branch pipe joint is configured as a mechanical joint for connecting the upstream side and the downstream side of the first pipe by insertion in the pipe axis direction of the first pipe,
A cylindrical first cylindrical part surrounding the first pipe, and a cylindrical second cylindrical part branched from the first cylindrical part and surrounding the second pipe A configured body member;
An annular shape that is provided at each opening end that opens to both ends of the first cylindrical portion and the end of the second cylindrical portion, and covers an open portion that extends from the opening end to the outer surface of the pipe. A cover member;
In a direction perpendicular to the tube axis of the first pipe, the second pipe is connected to the one side by insertion and the other side is screwed to the branch pipe joint. And a plug for connecting the branch pipe joint,
Protection of the branch pipe joint in which the inner diameter of the first tubular portion of the main body member is set to be equal to or greater than the length of the branch pipe joint in the direction orthogonal to the pipe axis of the first pipe Construction.   The cover body includes a cylindrical main body side connection portion that is externally fitted to the opening end portion, a cylindrical pipe side connection portion that is externally fitted to the pipe, the main body side connection portion, and the pipe side connection portion. The protective structure for a branch pipe joint according to claim 1, comprising a tapered portion connected to each other.   The protective structure for a branch pipe joint according to claim 2, wherein the cover member is made of a soft plastic.   The protection structure for a branch pipe joint according to any one of claims 1 to 3, wherein the pipe is a flexible gas pipe buried in the ground. A protective structure laying method for laying the branch pipe joint protective structure according to claim 1, with respect to a branch pipe joint branchingly connecting a second pipe to a first pipe,
With the first pipe and the second pipe removed from the branch pipe joint, the respective cover members are placed on the upstream side and the downstream side of the first pipe and on the second pipe side. In addition to attaching in the form of inserting the pipe, attaching the main body member in the form of inserting the first pipe into the first tubular portion on the upstream side or the downstream side of the first pipe, The main body member is retracted from the connection portion to which the branch pipe joint is attached,
With the upstream and downstream sides of the first pipe connected to the branch pipe joint and the second pipe removed, the retracted body member is slid toward the branch pipe joint. Let
Connecting the second pipe through the second tubular portion of the main body member to the pipe joint for branching;
A method for laying a protective structure for a branch pipe joint for connecting each cover member to an opening end of the main body member.   The protective structure laying method for a branch pipe joint according to claim 5, wherein a waterproof tape for preventing water from entering is wound between the opening end of the main body member and the cover member.

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