JPS5922753Y2 - Pipe fittings for cable installation - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a pipe joint used for connecting parts of underground pipes through which power cables, telephone cables, etc. are passed.

When cables such as electric power cables and telephone cables are laid underground, the cables have traditionally been laid in underground pipes for the purpose of protecting the cables.

However, underground pipes are often subjected to large forces due to ground subsidence, vibrations, etc., and this force can cause distortion of the pipe line, falling off of joints, breakage, etc., and as a result, damage to the internal cable. Otherwise, there have been cases where accidents have occurred, such as being cut off.

Such accidents often occur particularly at joints in a series of underground pipelines that have poor strength.

In view of these points, the present invention proposes a pipe joint that can absorb compression, tension, distortion, torsion, etc. applied to underground pipes, and is an expansion joint that can cope with expansion and contraction between connected pipes. The expansion joint part consists of a first and second moving pipe and an expansion/contraction regulating pipe that restricts the movement range of both pipes. The narrow angle ring fitted between the outer peripheral parts of the narrow angle tube is provided with a tapered surface on the inner surface thereof to allow angular displacement of the narrow angle tube.

The present invention will be described below with reference to the illustrated embodiment. This pipe joint is provided with two sets of expansion joints A and two sets of included angle joints B alternately.

The expansion joint part A is composed of a first moving pipe 1, a second moving pipe 2, and an expansion/contraction regulating pipe 3, and the opposing ends of the first moving pipe 1 and the second moving pipe 2 are provided with an outer Stopper flanges la and 2a whose diameters are enlarged are formed to protrude.

On the other hand, the expansion/contraction regulating pipe 3 is connected to the stopper flanges la, 2.
The stopper ring 3a is fitted to the outer periphery of the stopper a so as to be relatively slidable, and stopper rings 3a that engage with the stopper flanges la and 2a are screwed onto both ends of the stopper ring 3a.

Therefore, the first and second moving pipes 1 and 2 have a length l from the abutting position shown in FIG. 1 to the position shown in FIG.
(Fig. 1).

Note that 4 indicates an O-ring for water leakage interposed between the sliding surfaces of the stop flanges 1a and 2a and the expansion/contraction regulating tube 3.

The included angle joint part B is located between the second moving pipe 2 and the first moving pipe 1 of the adjacent expansion joint part A on the left side of the figure, and between the second moving pipe 2 and the first moving pipe 1 of the adjacent expansion joint part A on the right side of the figure. It is provided between the moving tube 2 and the narrow angle tube 5.

That is, each of the above-mentioned moving tubes is a moving tube of the expansion joint part A and is also a narrow angle tube, and the narrow angle ring 6 is fitted between the circumferences of a pair of adjacent narrow angle tubes.

The narrow angle ring 6 is formed to have a symmetrical cross-sectional shape, and has a male threaded portion 6a on its outer periphery and tapered surfaces 6b, 6b on its inner periphery.

The tapered surfaces 6b, 6b are formed by widening the diameter of the inner column, and therefore, the narrow-angle tube inserted into the tapered surfaces can be relatively moved within the narrow-angle range within the angular range of the tape surface.

A locking nut 7.7 is screwed into the outer peripheral male threaded portion 6a of the narrow angle ring 6 from both ends, and the locking nut 7.
．． Locking portions 7 a and 7 a at the outer ends of the tubes 7 abut against stop rings 8 and 8 fitted to each of the narrow angle tubes to hold the narrow angle ring 6 in a fixed position.

Note that 9 is interposed between the narrow angle ring 6 and each narrow angle tube,
It is a rubber gasket for honey with a triangular cross section.

In the main pipe joint having the above configuration, connected pipes 11 and 11 are connected to the first moving pipe 1 at the left end of the figure and the narrow angle pipe 5 at the right end, for example, via a threadless joint 10.

At this time, if both sets of expansion joints A are set to the shortest shortest state, when a tensile force is applied between the connected pipes 11 and 11 due to a disturbance such as ground subsidence, this joint will have a maximum length of 21. It can be expanded as much as shown in Figure 2.

In addition, since the included angle joint part B can tilt the first and second moving pipes 1 and 2 or the included angle pipe 5 along the slope of the tapered surface 6b of the included angle ring 6, the angle between the connected pipes 11 and 11 is It can also handle bending caused by

Of course, the initial degree of expansion of the expansion joint A can be changed as appropriate depending on the buried state.

For example, if one is set to the shortest shortest state and the other is set to the longest extended state, it is possible to extend and contract the length l.

In the above embodiment, two sets of expansion joints A and two sets of included angle joints B are arranged alternately, but depending on the condition of the buried portion, these may be arranged as two sets.

Furthermore, since the main pipe joint is intended to be buried underground, it is preferable that all the pipes, including the stop ring 8, be made of stainless steel.

As described above, according to the cable installation pipe joint according to the present invention, the joint action of the expansion joint part and the included angle joint part prevents tension, compression, bending, or a combination of these forces occurring between the connected pipes. Can be well absorbed.

Therefore, even if a disturbance such as ground subsidence occurs, the conduit will not be damaged, and the internal cables can be stably protected over a long period of time.

Further, in the present invention, the expansion joint part consists of a first moving pipe and a second moving pipe each having a stopper flange, and an expansion/contraction regulating pipe provided with a stopper ring at both ends, and the included angle joint part consists of a pair of included angle pipes, an included angle pipe, Since it consists of a ring and a locking nut, it is extremely easy to assemble by simply screwing each part together, and the cables can be passed inside while each part is carried to the construction site and assembled.

Furthermore, since the insides of the expansion joint part and the angle joint part communicate in a straight line, there is no possibility that the cable will get caught in the middle when the cable is passed through, thereby significantly increasing the efficiency of the cable installation work.

[Brief explanation of the drawing]

1 and 2 are longitudinal sectional views showing an embodiment of the pipe joint according to the present invention, with FIG. 1 showing the pipe joint in a contracted state and FIG. 2 showing the pipe joint in an enlarged and extended state. A...Expansion joint part, B...Include angle joint part, 1...First moving pipe, 2...Second moving pipe, 1a, 2a ...Stopper flange, 3...
...Expansion regulation tube, 3a...Stopper ring, 5...Included angle tube, 6...Included angle ring,
6b... Tapered surface, 11... Connected pipe.

Claims (1)

[Scope of utility model registration request] A pipe joint for cable installation comprising an expansion joint part and an angle joint part, wherein the expansion joint part has a first moving pipe and a second moving pipe each having stopper flanges projecting outward at opposite ends thereof. tube, and an expansion/contraction regulating tube that is fitted onto the outer periphery of the stopper flanges of the first and second moving tubes and has stopper rings at both ends that engage with the stopper flanges to regulate the distant ends of both moving tubes. The two moving pipes can expand and contract from the state in which both stopper flanges are in contact with each other to the state in which each stopper flange engages with each stopper ring, and the included angle joint portion is connected to either the first or second moving pipe. It consists of a pair of narrow angle tubes including one side, and a narrow angle ring that is fitted and locked between the outer circumferences of the ends of both tubes to connect the pair of narrow angle tubes, and this narrow angle ring is connected to the inner circumference of the narrow angle ring. It has a symmetrical shape with a tapered surface with an enlarged inner column diameter on the surface that allows the angle displacement of the angle tube, and a male thread on the outer periphery, and a locking nut is attached to both ends of the angle ring. A pipe joint for cable installation, which is screwed together and has a locking part at the outer end of a locking nut in contact with a stop ring fitted to each narrow angle pipe.