JPH07127772A - Steel pipe fitting - Google Patents

Abstract

PURPOSE:To improve flexibility and sealing ability and to always secure stable water stop performance by inserting the end parts of both pipes to be connected to each other in the interior of a split type sheath pipe having a projection on the inside thereof, and then injecting low hardening liquid rubber through a filler injection port of the sheath pipe. CONSTITUTION:In order to connect a pair of opposite pipes 1, 2 to each other, the opposite end parts thereof are respectively inserted in the interior of an upper sheath pipe 3 and butted to each other. At this time, stopper projections 5 are respectively integrally fixed to both end parts of the upper sheath pipe 3, and rubber rings 6 are fitted to the insides thereof. A seal tape 7 is stuck to a gap formed by butting both main pipes 1, 2 to each other. Further, the upper sheath pipe 3 is connected to a lower sheath pipe 3'. A low hardening liquid rubber 4 is injected through a filler injection port 8 bored in the upper sheath pipe 3 between both stopper projections 5, and then the filler injection port 8 is closed by a tap 9. Thus, flexibility and sealing ability are improved, and stable water stop performance is always secured.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water distribution pipe joint.

[0002]

2. Description of the Related Art Conventionally, main pipes for water distribution pipes are welded every several meters by joints or welding and are buried underground. However, if the joint section leaks water during long-term use, after cutting off the water supply, the joint member must be cut and removed with a cutter, etc., and replaced with a new member. It is not uncommon for many consumers to be embarrassed because it is time-consuming and the water supply mains are cut off. A packing material is used for these joints. A conventional fitting with a packing material that is a rubber ring, for example, tightens the back of the rubber ring with bolts through a push ring to apply uniform pressure to the rubber ring and generate surface pressure on the receiving port and the push face. It is well known that water-tightness is maintained by maintaining the watertightness.

Further, FIG. 3 is a pipe joint characterized in that a pipe-to-pipe is joined by an adhesive action of a curable liquid filler filled in a conventional pipe joint body (Japanese Patent Laid-Open No. 56-55778).
FIG. That is, as shown in FIG. 3, the abutting portions of the main tubes 1 and 2 are covered with the outer tube 12, and the gap between the end of the outer tube 12 and the tube is sealed with the sealing material 13, and the upper tube is provided at the upper part of the outer tube. The curable liquid filler 15 is injected from the injection hole 14 to fill the gap between the outer tube 12 and the main tubes 1 and 2, and the tube-to-tube is joined by the adhesive action of the filler.

[0004]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
In Japanese Patent No. 55778, since a high-hardness filler is used, the flexibility of the pipe is poor, and the sealing property may deteriorate depending on the case. Further, when a filler having a lower hardness is used as the filler, the flexibility is improved, but conversely, when water pressure (usually 5 kg / cm ² ) is applied to the inside of the pipe, the filler breaks, or It leaked out,
There is a problem that the seal will be broken.

[0005]

SUMMARY OF THE INVENTION In view of the above problems, the present invention has been made by the present inventors as a result of intensive development. As a result, a sheath tube is divided into a plurality of split types and a low hardness filler using a stopper ring is provided. An object of the present invention is to provide a steel pipe joint which is excellent in flexibility when used and has good workability in which the stopper ring prevents the filler from flowing out. The gist of the invention is that the ends of the two pipes to be connected are inserted into and abut against a split-type sheath pipe having projections on the inside, and the sheath pipe is provided on the outer peripheral surface between the pipes. A low hardness liquid rubber is injected from the filler injection port, and a rubber ring is provided at both ends between the pipe and the sheath pipe to prevent the liquid rubber from seeping out and swelling, thereby obtaining waterproofness. It is in a steel pipe joint.

[0006]

The present invention will be described in detail below with reference to the drawings. FIG. 1 is an overall sectional view of a steel pipe joint according to the present invention.
In FIG. 1, in order to connect the main pipes 1 and 2, these 2
The ends of the book pipes are inserted into the sheath pipe 3 and abutted against each other. In this case, both ends of the sheath pipe 3 are provided with integral fixed stopper projections 5 on the sheath pipe, a rubber ring 6 is fitted inside the circumference of the steel pipe, and the fitted main pipes 1 and 2 are fitted together. Match. Then, the seal tape 7 is attached to the gap where the main tubes 1 and 2 are butted. Subsequently, the lower sheath tube 3'and the upper sheath tube 3 are set and connected to the lower sheath tube 3 '. In this case, the rubber ring 6 serves as a stopper for preventing the injected liquid rubber from seeping out and swelling out. Moreover, sheath tube 3
A filler having a structure in which the sheath pipe 3 is set at both ends of the main pipes 1 and 2 which are pipes, and is provided between the integrated fixed stopper protrusions 5 at each end. Inlet 8
After injecting the low-curable liquid rubber 4, the filler injection port 8 is closed by the plug 9 to prevent the liquid from flowing out of the filler injection port 8.
Close up.

Since the low hardness liquid rubber used in the present invention must be determined from the relationship between the injectability and the viscosity, it is used together with a vulcanizing agent, a plasticizer, a softening agent, a filler, an aging resistance agent and the like. Mix freely according to the purpose. After injection, cure at room temperature. In that case, the joint part may be heated and cured by heating with a hand heater or the like. The liquid rubber hardness to be injected is a hardness within a range of 2 to 50 ° in Shore A hardness,
Desirably, the one having 5 ° to 20 ° is desirable because of good flexibility. Since stopper rings are provided at both ends of the packing material, the packing material does not flow out even if water pressure is applied, and since the sheath tube is divided into multiple parts, the weight is light even for large diameter tubes It has good properties and can be easily set even for large diameter pipes whose cross-section tends to be distorted. Further, it is no problem to apply a rubber-specific primer to the outer surface of the steel pipe and the inner surface of the sheath pipe before injecting the low hardness liquid rubber.

FIG. 2 is a sectional view taken along line XY of FIG. As shown in FIG. 2, the upper and lower sheath tubes are an upper flange 10 and a lower flange 10 'as a two-piece type of an upper sheath tube 3 and a lower sheath tube 3'.
Bolt with bolt 11.

[0009]

Example: A spiral steel pipe having a wall thickness of 6.4 mm, an outer diameter of 609.6 mm and a length of 2000 mm is provided with a wall thickness of 6.4 m at the tip.
m, outer diameter 619.6 mm, length 200 mm sheath pipe provided in the sheath pipe with clearance h of the spiral steel pipe and the sheath pipe being 20 mm, and integral fixed stopper projections and steel pipes 1 and 2
After receiving a rubber ring provided at the end of each of the main pipes 1 and 2 and affixing the seal tape at the space where the main pipes 1 and 2 are butted against each other, the lower sheath pipe and the upper sheath pipe are set, and the upper flange provided on this sheath pipe After the lower flange is bolted, the filler is injected from the filler injection port and is pressed to press the rubber ring so that it is caught by the integral fixed stopper protrusion provided on the sheath tube. After that, the liquid rubber was cured at room temperature. As a result, the water stopping test of the above steel pipe joint was carried out, and the water pressure was 20k.
When g / cm ² of water was flowed for 90 minutes, it was confirmed that there was no water leakage and that the water stopping was excellent.

[0010]

As described above, the steel pipe joint according to the present invention does not have the problem of deterioration of flexibility of the pipe when a conventional high hardness filler is used, and conversely has a low hardness filler. There is no problem of cutting off the seal when trying to do so, and it is possible to secure stable water stopability with good flexibility and good sealing property. In addition, since the flexible rubber is filled between the main pipe and the sheath pipe, the sealing property is further improved, and since the sheath pipe is divided into multiple pieces, the weight is light even for large diameter pipes It has excellent properties and has industrially excellent effects such as easy setting even in a large-diameter pipe whose cross section is likely to be distorted.

[Brief description of drawings]

FIG. 1 is an overall sectional view of a steel pipe joint according to the present invention.

2 is a cross-sectional view taken along line XY of FIG.

FIG. 3 is a cross-sectional view of a conventional pipe joint with a rubber-like member seal filled in the pipe joint body.

[Explanation of symbols]

 1, 2 Main pipe 3 Upper sheath pipe 3'Lower sheath pipe 4 Low-curing liquid rubber 5 Integrated fixed stopper protrusion 6 Rubber ring 7 Seal tape 8 Filler injection port 9 Plug 10 Upper flange 10 'Lower flange 11 Bolt 12 Outer tube 13 Sealing material 14 Injection hole 15 Liquid filling material

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiroyoshi Mashima, 1 Kimitsu, Kimitsu-shi, Chiba Nippon Steel Corporation Stock (72) Inventor Yoshihisa Temporary Garden, Kimitsu, Chiba Shin Nippon Steel Stock company Kimitsu Works (72) Inventor Ryuichi Kataoka 1 Kimitsu, Kimitsu City, Chiba Shin Nippon Steel Co., Ltd. Kimitsu Works

Claims (1)

[Claims] 1. A filler provided on the outer peripheral surface between the pipes, the ends of the two pipes to be connected being inserted into and abutted against a split type sheath pipe having projections on the inside thereof. Injecting low-hardness liquid rubber from the inlet, and applying a rubber ring at both ends between the pipe and the sheath pipe to prevent the liquid rubber from seeping out and swelling, thereby obtaining waterproofness. Steel pipe fittings.