JP2530930B2 - Conversion fitting - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a conversion joint for connecting single pipes corresponding to respective conduits of a perforated pipe, and more particularly to expansion and contraction at a connecting portion with the perforated pipe. The present invention relates to a conversion joint having a flexible structure.

[Prior Art] When laying communication cables, etc.
A perforated pipe typified by a perforated pipe may be used, and it is necessary to branch and connect to an ordinary circular cross-section single pipe in order to lead each of the pipe lines of the perforated pipe from the middle to another route. As a joint for connecting a perforated pipe and a single pipe, a conversion joint as shown in FIGS. 6 to 8 is used.

FIG. 6 is a partially cutaway side view of the conversion joint 3, and FIG.
VII-VII line sectional view of the figure, FIG. 8 is VIII- of FIG.
FIG. 8 is a sectional view taken along the line VIII of FIG.
It consists of a single tube 21, and one end side (hereinafter referred to as the left end side according to FIG. 6) 30 of the main body portion 31 is formed by a pipe portion 3b and partition walls 3a, 3a as shown in FIG. A four-hole pipe portion having a pipe line 33 is formed. Further, the other end side (hereinafter referred to as the right end side according to FIG. 6) is formed with a joint receiving portion 39 for connecting the single pipe 21, and the joint receiving portion 39 is formed with four receiving portions 38 having a circular cross section. are doing. That is, the cross-sectional shape of the pipe line 33 is configured to gradually change from a substantially square shape to a circular shape during the transition from the four-hole pipe portion on the left end side 30 of the main body portion 31 to the joint receiving portion 39 on the right end side. . The four single pipes 21 are respectively joined to the receiving ports 38 of the joint receiving ports 39, and the unique receiving ports 21a are formed at the other ends of the single pipes 21 for the individual single pipes 21, respectively. Receptacle 2
A single pipe 2 (shown by a chain line) for extension pipe is connected to 1a.

A four-hole pipe 1 having a receiving portion 1b as shown by a one-dot chain line in FIG. 6 is fitted to the left end side 30 of the main body portion 31 via an annular packing 4. That is, the insertion opening 32 of the main body 31 is fitted into the receiving portion 1b, the partition wall end surfaces 1A and 30A of both members are brought into contact with each other, and each pipe 33 is communicated with the single pipe 21. It has become like.

[Problems to be Solved by the Invention] However, at the joint portion of the above-mentioned four-hole pipe 1, the pipe end face of the socket 1b is abutted against the locking portion 31a of the conversion joint, and the end face 1A of the partition wall 1a is converted. Since they are in contact with each other on the end faces of the partition wall 30A, when an external force in the approaching direction acts on this joint due to the ground movement due to an earthquake or the like,
Since there is no room for expansion and contraction at the joint portion of the four-perforated pipe 1, the joint easily breaks.

Moreover, since the fitting length of the receiving portion 1b and the insertion portion 32 is short,
The expansion margin is very small, and when an external force in the separating direction is applied, it may easily separate and cause a problem that dirt, water, etc. may enter the pipeline.

It is conceivable to lengthen the fitting length as a means for solving the above-mentioned problems, but it is essential that the end faces of the partition walls 1a and 3a are in contact with each other, and this contact is guaranteed. If it is not done, it will not be possible to reliably separate adjacent pipe lines from each other, and when it becomes necessary to introduce a new cable, etc. into the pipe line afterward, the tip of the insertion cable will not connect this joint part. When passing, there is a possibility that it will fall out of a predetermined pipeline and fall into the adjacent pipeline. Therefore, the above problems
It was not a fundamental solution under other conditions that did not cause any problems.

Therefore, the inventors of the present invention have conducted repeated research for the purpose of providing a conversion joint that has a structure capable of expanding and contracting freely at the connection portion with the perforated pipe, and that each pipe line is completely independent and can guarantee the respective communicability. The present invention has been completed.

[Means for Solving the Problems] The present invention, which has achieved the above object, provides a conversion joint for joining a perforated pipe and a number of single pipes corresponding to the number of holes thereof.
An outer cylinder and an inner cylinder that accommodates and fixes the same number of holes as the number of holes in the outer cylinder are provided. One end of the outer cylinder is slidably received and joined to the porous tube via a rubber ring. A porous pipe joint is formed, a porous pipe insertion portion that can be inserted into each hole of the porous pipe is formed at one end of the inner cylinder, and a single pipe joint that is joined to the single pipe is formed at the other end. The idea is to have formed it.

[Operation and Embodiment] FIG. 1 is a partially cutaway side view showing a typical embodiment of the present invention, FIG. 2 is a sectional view taken along the line II-II of FIG. 1, and FIG. 3 is FIG. FIG. 3 is an enlarged view taken along the line III-III of FIG. The conversion joint 3 constitutes a connection portion for a 4-hole pipe on the left end side 30 and also on the right end side.
Connections for connecting four single tubes to 20 are formed.
The conversion joint 3 is housed in the outer cylinder 40 and the outer cylinder 40.
It is composed of an inner cylinder 50 of a book, the outer cylinder 40 is divided into two in the axial longitudinal direction and is composed of divided pieces 40A, 40B, and a connection part of the divided piece 40 with the four-hole pipe 1 is provided with an enlarged diameter receiving part 41. At the same time, the expanded diameter receiving portion 41 serving as the perforated pipe joint portion is provided with a recess 42 into which the ring-shaped packing 4 serving as a rubber ring is fitted.
The inner peripheral cross-sectional shape of the expanded diameter receiving portion 41 is the same as the outer peripheral shape of the four-hole tube 1 to be inserted, and is slightly larger. In addition, the end of the divided piece 40B on the right end side is provided with four single pipe receiving portions 2 as shown in FIG.
The size is set so that 1a can be stored inside, and the split piece 40B
A plate-shaped spacer 23 is fitted between the inner peripheral surface of the and the outer peripheral surface of the receiving portion 21a.

On the other hand, one inner cylinder 50 is hollow and both ends are open, and a guide part 51 as a perforated pipe insertion part, a changing part 52, a circular pipe part 53 and a receiving part 21a are integrally formed in order (see FIG. 1). Then from the left side to the right).
The cross-sectional shape of 51 is the same as that of the pipe of the four-hole pipe, and is formed to fit into the inner peripheral surface of the pipe.
a is a circular shape, and the changing portion 52 connecting the guide portion 51 and the circular pipe portion 53 is formed so as to gradually change from a substantially square shape (the cross-sectional shape of a four-hole pipe) to a circular shape.

Further, the inner cylinder 50 and the outer cylinder 40 are integrated by bonding the inner and outer peripheral surfaces thereof at a part of the changing portion 52 of the inner cylinder 50. As shown in FIG. 3, an annular gap A is formed between the inner circumference of the enlarged diameter portion 41 of the outer cylinder 40 and the outer circumference of the guide portion 51, and a gap B is formed between adjacent guide portions 51. Is formed, and the management 1b of the four-hole pipe and the partition wall 1a can be fitted into the respective gaps A and B. Further, the opening end 51a of the guide portion 51 is the enlarged diameter portion 4 of the outer cylinder.
It is formed over a length substantially equal to 1. Therefore, the 4-hole pipe 1 is inserted along the gaps A and B up to the position shown by the chain line in FIG. , And a guide part in each pipeline
51 is inserted and the pipe 54 in the inner cylinder 50 and the pipe in the four-hole pipe 1 are closely fitted to each other.

At this time, since the four-hole pipe 1 shown by the chain line in FIG. 1 has an allowance for the distance S on the back side of the conversion joint 3 and an allowance for the distance R on the retreat side, the four-hole pipe 1 due to an earthquake or temperature change, etc. Tube 1
The tube is allowed to move back and forth in the axial direction, and the tube is no longer easily damaged or detached.

In order to facilitate insertion of a 4-hole pipe, the open end 51a of the guide portion 51 is obliquely cut so as to project in the vicinity of the tube axis to form a tip surface, and the projecting tip portion is formed by a broken line in FIG. It is recommended to bend the wall surface of the guide portion 51 toward the hollow center side to form the introduction portion G as shown in FIG.

In the above embodiment, the conversion joint applied to the four-hole pipe has been described, but it is also applied to the two-hole pipe and the perforated pipe such as the three-hole pipe as shown in FIGS. 4 (A) and (B). It may be one that does. Further, in the above embodiment, the expanded diameter portion 41 is formed on the joint side. However, as shown in FIG. 5, a 4-hole pipe insertion opening is formed on the joint side, and a perforated pipe insertion portion is formed inside thereof. The guide portion 51 may be integrally formed. The symbol Ad in FIG. 5 indicates an adhesive portion.

[Effects of the Invention] Since the present invention is configured as described above, it has a structure in which it can be expanded and contracted at the connecting portion with the perforated pipe, and it is possible to prevent damage or separation of the pipe or joint due to movement of the pipe during an earthquake or the like. Became.

In addition, since each pipeline of the perforated pipe is completely separated by the partition wall and the guide part, it is possible to prevent intrusion of earth and sand and groundwater into the interior as much as possible. It is now possible to prevent it from slipping into the pipeline.

[Brief description of drawings]

1 is a partially cutaway side view showing a typical embodiment of the present invention, FIG. 2 is a sectional view taken along the line II-II of FIG. 1, and FIG. 3 is a sectional view taken along the line III-III of FIG. FIG. 4 (A) is a partially cutaway side view showing another embodiment of the present invention, and FIG. 4 (B) is a sectional view taken along line b-IVb of FIG. 4 (A) IV. 5 and 5 are sectional explanatory views showing another embodiment of the present invention, FIG. 6 is a partially cutaway side view showing a conventional example, FIG. 7 is a sectional view taken along the line VII-VII in FIG. FIG. 8 is a sectional view taken along the line VIII-VIII of FIG. 1 …… 4 hole pipe, 2 …… Single pipe 3 …… Conversion joint, 4 …… Packing 21a …… Receptacle part, 40 …… Outer cylinder 50 …… Inner cylinder, 51 …… Guide part A, B …… gap

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Hiroshi Yamazaki 1-1-6 Uchisaiwaicho, Chiyoda-ku, Tokyo Inside Nippon Telegraph and Telephone Corporation (56) References 62-12953 (JP, Y2) Actual public 1-12069 (JP, Y2) Actual public Sho-57-27996 (JP, Y2)

Claims (1)

(57) [Claims] 1. A conversion joint for joining a perforated pipe and a number of single pipes corresponding to the number of holes, wherein the outer pipe and the outer pipe are accommodated and fixed in the same number as the number of holes. An inner cylinder; and, at one end of the outer cylinder, a porous pipe joining portion slidably received and joined to the porous pipe via a rubber ring is formed, and at one end of the inner cylinder, A conversion joint, characterized in that a perforated pipe insertion portion that can be inserted into each hole of the perforated pipe is formed, and a single pipe joint portion that is joined to the single pipe is formed at the other end.