JP3047714U - Waterproof packing and stopper device for slide pipe for underground wiring - Google Patents

Abstract

(57) [Summary] [Problem] Withdrawal breakage between inner and outer pipes of a slider type double pipe structure even if a large settlement occurs in the connection of the electric wire conduit of the hand hole and the bridge subducting pipeline in the soft ground, etc. And to prevent flooding, etc., so that various cables stored inside can be sufficiently protected. SOLUTION: A double-pipe structure having large and small-diameter inner and outer pipes (2, 3) in which telescopic pipe sections 1 for storing and holding various cables buried in the ground are slidably combined with each other. A small-diameter tube-side annular groove 5 is formed in the outer peripheral surface on the open end side of the small-diameter tube 3 slidably inserted into the large-diameter tube 2 of the telescopic tube portion 1, and the open end side of the large-diameter tube 2 extends in the outer circumferential direction. The large-diameter tube-side annular groove 6 is formed by annular recess. In the large-diameter tube-side annular groove 6, an annular outer peripheral stopper portion 13 is provided via a peripheral groove 14.
A and the inner peripheral stopper portion 13B are provided with a waterproof packing 11 formed in a forked shape, and the inside of the small-diameter tube-side annular groove 5 is located at a position where the large-diameter tube-side annular groove 6 and the small-diameter tube-side annular groove 5 face each other. The inner peripheral stopper portion 13B is configured to bulge in and prevent the small diameter tube 3 from being pulled out.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention is intended to protect the electric wires housed inside even in the case of ground subsidence, boundary subsidence, etc. in the connection of electric wire conduits of hand holes and bridge subducting conduits in soft ground, for example. For buried telescopic cables that can follow the sinking phenomenon and that can be flexibly expanded and bent, a waterproof packing function at the pipe connection and waterproof slide pipes for buried underground wiring to prevent the pipes from coming off when they slide. It relates to a packing and stopper device.

[0002]

[Prior art]

 In order to cope with land subsidence on soft ground and subsidence at the bridge / general road boundary of bridges, various cables laid in these places are accommodated in flexible and flexible conduits. Is protected by In other words, in places where such settlements occur, a method using steel pipe or polyester pipe by welding, a method using mechanical joining, a method using a combination of curved pipes, a method using expansion joints, and using pods It is said that conduits, which are conduits, must be constructed by methods and the like. Therefore, various types of telescopic conduits of various types, such as telescopic and flexible types, have been conventionally proposed. For example, in the case of a slider-type double pipe structure, wiring is laid underground. Each cable is slidable so that it can be stored and held underground. Something has been proposed.

[0003]

[Problems to be solved by the invention]

 However, the conventional technique described above cannot sufficiently cope with the case where the amount of settlement at the settlement site is large, and the inner and outer pipes of the slider type double pipe structure greatly extend the slide stroke area of both pipes. Crabs. As a result, both conduits are pulled out without a sufficient stopper function being performed, and as a result, there is a risk that the various cables housed inside will be exposed from the places where they were pulled out and may be tensilely damaged. Was.

Accordingly, the present invention has been made in view of the above-mentioned existing circumstances. For example, in connection of a conduit for a handhole in a soft ground, a connection for a bridge extension line, and the like, Even if a large settlement occurs, the inner and outer tubes of the slider type double tube structure are prevented from being pulled out, and the ingress of water from the outside is also sufficiently prevented to protect various cables stored inside. It is an object of the present invention to provide a waterproof packing and stopper device for a slide tube for underground wiring, which is made possible.

[0005]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention includes inner and outer pipes of different diameters which are slidably combined with each other to accommodate and hold various cables buried underground in the ground. A waterproof packing / stopper device in a telescopic tube part 1 having a double-tube structure, wherein one open end of a small-diameter tube 3 slidably inserted into the large-diameter tube 2 and inserted from one open end side. A small-diameter tube-side annular groove 5 is formed in the outer peripheral surface of the large-diameter tube, and a large-diameter tube-side annular groove 6 is formed by annularly recessing one open end of the large-diameter tube 2 in the outer peripheral direction. The large-diameter tube-side annular groove 6 and the small-diameter tube-side annular groove 5 are disposed in the large-diameter tube-side annular groove 6 in a compressed state between the tube-side annular groove 6 and the outer peripheral surface of the small-diameter tube 3. Waterproof packing that partly bulges into the small-diameter tube-side annular groove 5 at a position where the small-diameter tube 3 is prevented from coming off. And it shall consist of grayed 11. The waterproof packing 11 has a large-diameter opening 12 on the opening end side of the large-diameter pipe 2 and a thick-walled small-diameter opening while gradually reducing the inner peripheral surface in a stepped shape as it reaches the inside of the pipe. The annular outer peripheral stopper 13A and the inner peripheral stopper 13B are formed in a forked shape on the edge surface of the small-diameter opening portion 13 via a peripheral groove 14 formed along the pipe axis direction. The outer peripheral stopper portion 13A is always fitted into the large-diameter tube-side annular groove 6, and the small-diameter tube-side annular groove 5 is positioned at a position where the large-diameter tube-side annular groove 6 and the small-diameter tube-side annular groove 5 face each other. The inner peripheral stopper portion 13B is swelled and engaged inside the annular groove 5 to prevent the small diameter tube 3 from being pulled out. Further, the flexible pipe 4 may be connected to at least one of the large-diameter pipe 2 and the small-diameter pipe 3.

In the waterproof packing and stopper device of the slide pipe for underground buried wiring according to the present invention configured as described above, the large diameter pipe 2 and the small diameter are used for burying various cables underground. The cables are accommodated in the telescopic tube portion 1 and the flexible tube portion 4 in which the tubes 3 are inserted into each other and connected in a double tubular shape. For example, in soft ground, when the cable rises or descends with respect to the fixed holding part side of the cable due to the settlement of the ground or the like, the inner and outer pipes (2, 3) in the telescopic tube part 1 are moved in the extension direction in accordance with this. Or, it is slid in the contraction direction, and the flexible tube portion 4 is bent and deformed. At this time, the waterproof packing 11 provided in the large-diameter tube-side annular groove 6 is connected to the large-diameter tube-side annular groove 6 while the inner and outer tubes (2, 3) slide in the extension direction. When the small-diameter pipe 3 is pulled out, the inner-peripheral stopper 13B provided on the inner periphery of the waterproof packing 11 is swelled into the small-diameter pipe-side annular groove 5 when the small-diameter pipe 3 is pulled out. The cable is prevented from being detached, and damage such as breakage and cutting of the cables and the like stored in the telescopic tube portion 1 and the flexible tube portion 4 is prevented. Further, since the outer peripheral stopper 13A and the inner peripheral stopper 13B of the waterproof packing 11 are formed bifurcated through the peripheral groove 14, the inner peripheral stopper 13B is formed inside the small-diameter tube-side annular groove 5. When it comes into contact with the outer peripheral surface of the small-diameter tube 3, the inner peripheral stopper portion 13 </ b> B is quickly flexed and retracted outward while the peripheral groove 14 is crushed and adhered. Then, the assembling work of the inner and outer pipes (2, 3) through the waterproof packing 11 is made easy and quick.

[0007]

[Embodiment of the invention]

 DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings. Reference numeral 1 shown in the drawings is connected to a hole structure (not shown) such as a manhole or a handhole buried underground or the like. This is a telescopic tube part that forms part of an electric conduit formed of, for example, vinyl chloride resin. As shown in FIGS. 1 and 3, the telescopic tube portion 1 is configured such that a large-diameter tube 2 and a small-diameter tube 3 are inserted into each other and connected in a double tube shape. It is installed at the expected cable laying site and is mainly applied to telecommunications, low-voltage, high-voltage cable drop-in of buildings, breakage of bridge splint pipes, parts with height differences, etc. The large-diameter pipe 2 is formed with a flexible pipe section 4 which is bendable via a joint means. The flexible tube 4 may be connected to the small-diameter tube 3. Further, the expansion / contraction tube portion 1 may have a double-tube structure of either a single expansion / contraction type in which one side thereof is expandable or a double-sided expansion type in which both sides are expandable.

The telescopic tube section 1 has a double-tube structure including inner and outer tubes (2, 3) having large and small diameters which are slidably combined with each other as described above. As shown in FIG. A stopper function to prevent the large-diameter pipe 2 and the small-diameter pipe 3 from coming off and a waterproof function to prevent water from infiltrating between the large-diameter pipes 2 and the small-diameter pipes 3 that come into contact with each other. And a waterproof packing 11 made of a seal packing material or the like, which is provided at the same time. That is, as shown in FIG. 5, the small-diameter pipe 3 is slidably inserted into the large-diameter pipe 2 and inserted from the one open end side. A large-diameter tube-side annular groove 6 is formed by forming an annular groove in the outer peripheral direction at one open end side of the large-diameter tube 2, and the large-diameter tube-side annular groove 6 and the small-diameter tube are formed. The outer peripheral surface of the small-diameter tube 3 is compressed and the waterproof packing 11 itself is disposed in the large-diameter tube-side annular groove 6, and the inner peripheral surface of the waterproof packing 11 is in close contact with the outer peripheral surface of the small-diameter tube 3. In this state, the inner and outer pipes (2, 3) slide with each other. Then, as shown in FIG. 4, when the large-diameter pipe 2 and the small-diameter pipe 3 slide in the withdrawing direction and come to a position where the large-diameter pipe-side annular groove 6 and the small-diameter pipe-side annular groove 5 are opposed to each other. A part of the inner peripheral portion of the waterproof packing 11 is bulged into the small-diameter tube-side annular groove 5 to prevent the small-diameter tube 3 from coming off from the large-diameter tube 2.

As shown in FIG. 2, the specific structure of the waterproof packing 11 is as follows. As shown in FIG. 2, the large-diameter pipe 2 has a large-diameter opening 12 on the open end side, and the inner peripheral surface is gradually stepped toward the inside of the pipe. While being reduced in diameter, it becomes a thick small-diameter opening 13, and an annular outer peripheral stopper 13 A is formed on an edge end surface on the small-diameter opening 13 side through a circumferential groove 14 formed along the pipe axis direction. The circumferential stopper portion 13B is formed in a forked shape. A zigzag step 16 is formed on the inner peripheral surface of the waterproof packing 11 to reinforce the bite between the peripheral surface of the small-diameter tube 3 to slide and the small-diameter tube-side annular groove 5 to be engaged. There are things. The outer peripheral stopper portion 13A is always fitted in the large-diameter tube-side annular groove 6, and the inside of the small-diameter tube-side annular groove 5 is located at a position where the large-diameter tube-side annular groove 6 and the small-diameter tube-side annular groove 5 face each other. The inner peripheral stopper portion 13B is bulged and engaged to prevent the small diameter tube 3 from being pulled out. In addition, on the outer peripheral surface of the waterproof packing 11 fitted in the large-diameter tube-side annular groove 6, for example, a plurality of two annular oil seal annular grooves 15 are formed.

In the embodiment described above, the inner peripheral stopper 13B of the outer peripheral stopper 13A and the inner peripheral stopper 13B formed bifurcated through the peripheral groove 14 of the waterproof packing 11 is connected to a small-diameter pipe. The small-diameter pipe 3 is prevented from being pulled out by being swelled into the side annular groove 5. However, although not shown in the drawing, the small-diameter pipe 3 is formed to have the same length as the waterproof packing 11 itself. The waterproof packing 11 is disposed inside the pipe-side annular groove 5, and the outer peripheral stopper 13 A of the waterproof packing 11 is swelled into the large-diameter pipe-side annular groove 6 to engage with the large-diameter pipe 2. It may be configured to prevent withdrawal. Furthermore, a small-diameter fold-shaped annular extension is provided on the inner peripheral side of the large-diameter opening 12 of the waterproof packing 11, and the small-diameter tube-side annular groove 5 is opposed to the large-diameter tube-side annular groove 6 and the small-diameter tube-side annular groove 5. It is also possible to prevent the small-diameter tube 3 from being pulled out by making the annular extension bulge into the inside of the annular groove 5, and the operation and effect based on the configuration are substantially the same as those in the above-described embodiment, so description thereof will be omitted. .

[0011] Next, an example of the use of the present invention will be described. Various types of cables for communication, low pressure, and high pressure are pulled in a building, a bridge is broken down, a cable is laid in a portion having a height difference, and the like. At this time, the telescopic tube section 1 is installed as a conduit at the buried portion, and a cable is housed inside. For example, when a hole structure (not shown) is installed in a place where land subsidence is expected on soft ground and an electric conduit is connected to it, the telescopic pipe 1 and the flexible pipe are used as the electric conduit. 4 is connected to the hole structure via a waterproof pipe and a waterproof treatment (not shown) by connecting them via joint means (not shown). At this time, as shown in FIG. 1, the waterproof packing 11 is first disposed in the large-diameter tube-side annular groove 6 at one opening edge of the large-diameter tube 2, and then, as shown in FIG. Then, the opening edge of the small-diameter tube 3 on the side of the small-diameter tube-side annular groove 5 is fitted into the opening edge of the large-diameter tube 2 so that the small-diameter tube-side annular groove 5 has a margin for a predetermined slide stroke. It is installed by inserting it to the back side. At this time, when a shearing force is applied to the telescopic tube 1 itself, as shown in FIG. 4, the large-diameter tube-side annular groove 6 and the small-diameter tube-side annular groove 5 are slid to a position where they face each other. The inner peripheral stopper portion 13B is swelled and engaged inside the small-diameter tube-side annular groove 5 to prevent the small-diameter tube 3 from being pulled out of the large-diameter tube 2. In this way, the telescopic tube portion 1 and the flexible tube portion 4 both having a pipe structure sufficiently resist external shearing force and crushing force, and connect the internally housed cable to the physical and mechanical sources from the outside. It protects against change.

[0012]

[Effect of the invention]

 As described above, according to the present invention, in the connection of the electric wire conduit of the handhole, the bridge subducting conduit, etc. in the soft ground, a large settlement occurs, and the inner and outer telescopic pipes 1 of the slider type double pipe structure are formed. Even if the pipes (2, 3) slide, the inner and outer pipes (2, 3) do not come off due to the stopping action of the waterproof packing 11, which locks the inner and outer pipes (2, 3). Various cables can be sufficiently protected. In other words, when constructing a pipeline underground, the connection direction can be adjusted freely, and it can be expanded and contracted with other pipe materials to be connected. It is possible to prevent cable accidents due to slipping out of underground pipelines around buildings and bridge clogging due to settlement, etc.

According to the present invention, the waterproof packing 11 disposed in the large-diameter tube-side annular groove 6 in the expansion tube portion 1 having the double-tube structure including the large-diameter tube 2 and the small-diameter tube 3. In the case where the inner and outer pipes (2, 3) slide in the extension direction, when the large-diameter pipe-side annular groove 6 and the small-diameter pipe-side annular groove 5 slide to each other, waterproof packing is performed. This is because the inner peripheral stopper 13B provided on the inner periphery of the tube 11 itself bulges into the small-diameter tube-side annular groove 5 to prevent the small-diameter tube 3 from being pulled out. In addition, it is possible to prevent the cables and the like housed in the flexible pipe section 4 from being damaged, such as breakage and cutting, at the same time as the waterproof function.

Further, since the outer peripheral stopper portion 13A and the inner peripheral stopper portion 13B of the waterproof packing 11 are formed bifurcated through the peripheral groove 14, the large-diameter tube-side annular groove 6 and the small-diameter tube-side annular member are formed. When the groove 5 is slid to a position facing the groove 5, the inner peripheral stopper portion 13B can be quickly and resiliently protruded and locked inside the small-diameter tube-side annular groove 5, and the outer peripheral surface of the small-diameter tube 3. When it comes into contact with the inner peripheral portion, the inner peripheral stopper portion 13B can be flexed and retracted quickly while the peripheral groove 14 is crushed and adhered, and sufficiently resists external shearing force, crushing force, bending force, and the like. be able to. Further, according to such a unique shape of the waterproof packing 11, the assembling work between the inner and outer pipes (2, 3) via the waterproof packing 11 in the construction of the entire piping configuration is simple and quick. Can be done.

Further, since the flexible tube 4 is connected to at least one of the large-diameter tube 2 and the small-diameter tube 3 of the telescopic tube 1, cooperation with the telescopic tube 1 and the flexible tube 4 is possible. By the action, it sufficiently resists external shearing force, crushing force, bending force, etc., and protects the internally stored cable against external physical and mechanical fluctuations.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of an embodiment of the present invention.

FIG. 2 is a sectional view of a waterproof packing.

FIG. 3 is a side view of a partly cutaway in an example of a buried use state.

FIG. 4 is a cross-sectional view when the same is extended.

FIG. 5 is a cross-sectional view of the same during contraction.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Telescopic pipe part 2 ... Large diameter pipe 3 ... Small diameter pipe 4 ... Flexible pipe part 5 ... Small diameter pipe side annular groove 6 ... Large diameter pipe side annular groove 11 ... Waterproof packing 12 ... Large diameter opening 13 ... Small diameter opening 13A ... outer peripheral stopper portion 13B ... inner peripheral stopper portion 14 ... peripheral groove 15 ... annular groove for oil seal 16 ... stepped portion

Claims (4)

[Utility model registration claims] 1. A waterproof packing in a telescopic tube portion having a double-tube structure having inner and outer tubes of large and small diameters slidably combined with each other for storing and holding various cables buried underground in the ground. A stopper device, wherein a small-diameter tube-side annular groove is formed on the outer peripheral surface on one opening end side of the small-diameter tube inserted slidably into the large-diameter tube from one opening end side, and a large-diameter tube. One of the open ends is annularly depressed in the outer circumferential direction to form large-diameter tube-side annular grooves, respectively, and the large-diameter tube-side annular groove and the outer peripheral surface of the small-diameter tube are compressed and become large. The small-diameter pipe is disposed in the small-diameter pipe-side annular groove, and partially bulges into the small-diameter pipe-side annular groove at a position where the large-diameter pipe-side annular groove and the small-diameter pipe-side annular groove face each other. A waterproof packing for a slide tube for underground wiring, comprising a waterproof packing for preventing removal. And stopper device. 2. The waterproof packing according to claim 1, wherein the large-diameter pipe has a large-diameter opening at an opening end side, and a large-diameter small-diameter opening gradually reducing the inner peripheral surface in a stepped shape as it reaches the inside of the pipe. Becomes
An annular outer peripheral stopper and an inner peripheral stopper are formed in a forked shape on the edge end surface on the side of the small diameter opening through peripheral grooves formed along the pipe axis direction. Part is always fitted in the large-diameter tube-side annular groove, and the inner peripheral stopper bulges into the small-diameter tube-side annular groove at the position where the large-diameter tube-side annular groove and the small-diameter tube-side annular groove oppose each other. The waterproof packing and stopper device for a slide pipe for underground wiring according to claim 1, wherein the small diameter pipe is prevented from being pulled out. 3. The waterproof packing / stopper device for a slide pipe for underground wiring according to claim 1, wherein a flexible pipe portion is connected to at least one of the large diameter pipe and the small diameter pipe. . 4. Waterproof packing in a telescopic tube part having a double-tube structure having large and small-diameter inner and outer tubes combined with each other so as to be slidable for storing and holding various cables buried underground in the ground. A stopper device, wherein a small-diameter tube-side annular groove is formed on the outer peripheral surface on one opening end side of the small-diameter tube inserted slidably into the large-diameter tube from one opening end side, and a large-diameter tube. One of the open ends is annularly depressed in the outer circumferential direction to form large-diameter tube-side annular grooves, respectively.The open end of the large-diameter tube is a large-diameter opening, and the inner peripheral surface is on the inner side of the tube. As the diameter of the opening decreases, the diameter of the opening gradually decreases in the form of a step, forming a thick-walled small-diameter opening, and an annular outer peripheral stopper portion is formed on the edge end surface on the small-diameter opening side through a circumferential groove formed along the pipe axis direction. And the inner peripheral stopper portion are formed in a forked shape, and the large-diameter tube-side annular groove and the outer peripheral surface of the small-diameter tube are formed. The outer stopper portion is always engaged with the large-diameter tube-side annular groove, and the outer stopper portion is always engaged with the large-diameter tube-side annular groove. At the position where the side annular groove and the small-diameter tube-side annular groove face each other, the inner peripheral stopper portion is swelled and engaged inside the small-diameter tube-side annular groove to prevent the small-diameter tube from being pulled out. Waterproof packing and stopper device for slide pipes for underground wiring.