Pipe joint

A technology of pipe joints and pipe bodies, applied in the field of pipe joints, can solve the problems of large amount of use, inability to stop water, and inability to exert water-stopping functions.

Inactive Publication Date: 2008-10-01
FURUKAWA ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

That is, when the water-sealing fiber sheet 102 is inflated, the resin material 103, which is important for water sealing, is likely to fall off after or when the pipe body is removed. Play a full water-stop function
In addition, water-swellable resins are generally expensive, and as described above, in a structure composed of only a water-sealing fiber sheet, the amount of use is large, and it cannot be manufactured cheaply.
[0015] For example, the tape of Patent Document 1 in which a water-sealing fiber sheet made of a water-swellable resin material uniformly distributed over the entire circumference is wound into a substantially cylindrical shape and integrally molded on the inner peripheral surface of the short tube portion. For pipe joints with water-sealing sheets, the two ends of the water-sealing fiber sheets wound into a substantially cylindrical shape are abutted in the circumferential direction, and the wate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0141] figure 1 , figure 2 The pipe joint 1 of Embodiment 1 is shown. The pipe joint 1 is formed by expanding layered or sheet-like water over the entire area of ​​the inner peripheral surface of a joint body 1a made of synthetic resin or synthetic rubber with continuous spiral grooves 1b. The part 4 is integrated, and connects one pipe body 2 (so-called pipe) having spiral concavo-convex strips 2a and the other pipe body 2 (so-called pipe) having spiral concavo-convex strips 2a.

[0142] That is, the pipe joint 1 is sleeved on the pipe body 2 and connected until the other end 1A of the pipe joint 1 coincides with the end 2A of the one pipe body 2, and then the end 2A of the pipe body 2 is aligned with the other end 2A. After the end 2A of the pipe body 2 is the same or roughly the same, the pipe joint 1 that has been screwed in is unscrewed by about half of the screw-in amount, and the other side of the pipe joint 1 is sleeved on the pipe body 2 to connect, such as image 3 As...

Embodiment 2

[0171] Figure 8 The pipe joint 1 of Embodiment 2 is shown. The pipe joint 1 is made of synthetic resin or rubber with continuous spiral concave and convex strips 1b composed of a convex portion 1bA protruding inward in the radial direction and a concave portion 1bB forming an outer peripheral portion. The inner peripheral surface of the joint body 1a is integrally formed by integrating a water swelling portion 4 of substantially uniform thickness, which will have Figure 8 The shown top 2aA and valley 2a constituted by the spiral concave-convex strip 2a one side of the tube 2 (the so-called tube) and the top 2aA and the valley 2a constituted by the spiral concave-convex strip 2a on the other side of the tube 2 (the so-called的管) Connect in the same way as in the first embodiment above.

[0172] Picture 9 , Picture 10 In this case, the number of helical protrusions in the axial direction of the joint body 1a, that is, the number of protrusions 1bA is "4-6". As an example, the c...

Embodiment 3

[0198] Figure 23 The pipe joint 1 of Embodiment 3 is shown. The pipe joint 1 connects the pipe bodies 2 and 2 made of synthetic resin in the same manner as the above-mentioned Embodiment 1 and Embodiment 2, and has the pipe bodies connected by screwing on both sides In the cylindrical shape of the connecting portion 1c at the two ends, a water-stopping function layer 3 that absorbs water and expands is formed on the inner surface of the joint body 1a having the spiral concave-convex strips 1b to stop water between the pipe bodies 2 after the connection. In the pipe joint 1 of this example, the entire longitudinal direction has the same shape as the connecting portion 1c.

[0199] The water-stop function layer 3 is formed using a water-swellable portion 4 made of a water-swellable nonwoven fabric. Figure 24 It is an explanatory diagram showing the structure of the water-stopping functional layer 3. The water-stopping functional layer 3 is formed by providing a holding clip 5 mad...

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Abstract

The invention relates to a pipe joint, comprising a joint body connecting an end portion of a pipe body provided with a spiral concavoconvex strip, which is characterized in that: a water-expandable portion is arranged on inner periphery surface of the joint body; when the joint body is made use of to connect the pipe body, an almost uniform clearance is formed between the water-expandable portion and the outer peripheral surface of the pipe body.

Description

[0001] The invention patent application is a division of the invention patent application whose international application number is PCT / JP2004 / 006250, the international filing date is May 11, 2004, the national application number that entered the Chinese national phase is 200480012699.8, and the name is "pipe joint" Application. Technical field [0002] The present invention relates to a pipe joint that connects pipe bodies that protect, for example, power cables, communication cables, etc. buried in the ground. Background technique [0003] Generally speaking, the pipe bodies for protecting wires or cables and the pipe joints connecting the pipe bodies in the above examples are buried in the ground. Therefore, a reliable and sufficient waterproof structure and stop are particularly required between the pipe body and the pipe joint. Water structure. [0004] In the past, various pipe joints have been invented in order to meet such demands. That is, there is a pipe joint with a wat...

Claims

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Application Information

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IPC IPC(8): F16L21/00F16L17/10F16L21/02F16L33/00F16L33/28H02G1/06H02G3/06H02G9/06
Inventor 和田直人白银克彦寺阪刚
Owner FURUKAWA ELECTRIC CO LTD
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