JPH06300173A - Coupling for pipe - Google Patents

Abstract

PURPOSE:To provide a clamp type coupling which is designed to prevent from the occurrence of separation of a pipe and leakage of water even in a pipe the internal pressure of which is high. CONSTITUTION:The bent end part 8a of a first plate-form flange 8 loosely fitted in a bolt 7 fixed to a first side bar flange 6 is engaged with the outer end of a side bar flange 11. By fastening a nut 10, a metallic band 4 is securely fastened against a pipe 2 through a gasket 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connecting joint for steel pipes and the like.

[0002]

2. Description of the Related Art A clamp type joint is known as a type of connecting joint for steel pipes and the like. This joint is disclosed in, for example, JP-A-5
2-55019, JP 61-109997, JP-B 3-26387, JP-B 4-5842.
It is disclosed in Japanese Patent Publication, etc., and is a band-shaped member that is wound around the outer peripheral surface of a pipe and has a taper at both ends in the circumferential direction, and it can be wound around the outer periphery of this gasket or packing. A metal band having various elasticity, a plurality of bolts attached to both ends in the circumferential direction of the metal band and arranged in the axial direction, and nuts screwed to these bolts, and the metal band is a gasket Or a fastener for tightening and fixing the metal band to the pipe by tightening a nut in a state of being wound around the outer periphery of the packing so that both ends of the metal band are relatively close to each other and the diameter of the metal band is reduced. It is a thing.

[0003]

These conventional clamp type joints are used mainly for repairing cracks, pinholes, etc. of a pipe when winding water around the pipe to stop water. Although it is effective, when used as a joint for pipes, the resistance to thrust due to internal pressure is not always sufficient, and when the internal pressure of the pipes is extremely high, large thrust is applied to both pipes, so thrust resistance There is a risk that the weaker pipe may come off, and even if such a pipe does not come off, water may leak through the overlapping portion of the gasket wound around the pipe.

The present invention has been made in view of the above-mentioned problems of the conventional joints, and it is an object of the present invention to provide a clamp type joint which does not cause disconnection of pipes or leakage of water even when used for connecting pipes having high internal pressure. To do.

[0005]

The pipe joint of the present invention that achieves the above object is a strip-shaped member wound around the outer peripheral surface of a pipe, and a gasket having taper at both ends in the circumferential direction. A metal band having elasticity that can be wound around the outer periphery of the gasket, and a plurality of bolts that are attached to both ends in the circumferential direction of the metal band, are arranged in the axial direction, and nuts that are screwed into the bolts, Tighten the metal band to the pipe by winding the metal band around the outer periphery of the gasket to tighten the nut so that both ends of the metal band are relatively close to each other and the diameter of the metal band is reduced. In a pipe joint having a fastening fastener, the fastening means includes an axially extending first sidebar flange secured to one circumferential end of the metal band and an axial direction. Orthogonal to A bolt that is a plurality of axially aligned one end fixed to the first side bar flanges in the so that the end portion of the inner said bolt being loosely fitted first
A first plate-like flange bent toward the sidebar flange of the plate, and a flat plate-like second plate-like flange in which the bolt is loosely fitted on the free end side of the bolt with respect to the first plate-like flange. A nut screwed with the bolt on the free end side of the bolt with respect to the second plate-shaped flange, and an axially extending second end fixed to the other end of the metal band in the circumferential direction. 1 is fixed to the sidebar flange and the second sidebar flange, and the portion of the bolt on the side of the middle fixed end is fitted.
A side plate composed of a pair of plates, the metal band is wound around the outer periphery of the gasket, the bolt is fitted between the side plates, and the bent end portion of the first plate-shaped flange is connected to the second plate. The metal band is tightened and fixed to the pipe by tightening the nut while engaging with the outer end of the side bar flange.

Further, in one aspect of the present invention, in addition to the above-mentioned structure, the pipe joint has a sheet made of water-expanded rubber between the both ends of the tapered shape which are superposed in a state where the gasket is wound around the outer peripheral surface of the pipe in the axial direction. It is characterized in that it is arranged in.

[0007]

According to the present invention, the plate-like flange loosely fitted to the bolt of the fastener is composed of two plate-like flanges, one of which has the inner end on the first sidebar flange side. Since it is bent and formed so that it can be engaged with the outer end of the second sidebar flange, and the other one is formed in a flat plate shape, the outer end of the second sidebar flange is formed. It becomes possible to form the bent portion of the plate-like flange for engaging the portion by bending, and it is possible to increase the tightening pressure by the nut by setting the thickness of the flat-plate flange sufficiently large, Even if it is used as a connection joint when the internal pressure of the pipe is high, it can have sufficient thrust resistance and sealing function.

Further, by arranging a sheet made of water-expandable rubber between the both ends of the gasket in the axial direction, even if the tapered both ends of the gasket slide relative to each other by tightening the nut, the water-expansion rubber The sheet does not separate from the superposed portion of the gasket, and the sealing function can be increased by expanding the water-expandable rubber.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a cross-sectional view showing one embodiment of the joint of the present invention, FIG. 2 is a perspective view of the same embodiment, and FIG. 3 is a cross-sectional view showing an overlapping portion of a gasket.

The joint 1 is provided with a gasket 3 wound around the outer circumference of the pipe 2, a metal band 4 which can be wound around the outer circumference of the gasket 3, and a fastener 5 for fastening the metal band to the pipe. ing.

The gasket 3 is a strip-shaped rubber sheet on the inner peripheral surface side (the side in contact with the tube) of which grid-like irregularities are formed to enhance the water blocking effect, and is entirely lined on the inner peripheral surface side of the metal band 4. ing. Both ends 3a, 3b of the gasket 3
Has a taper so that the wall thickness gradually becomes smaller toward the end in order to prevent the wall thickness from increasing due to superposition.

The metal band 4 has an opening 4 extending in the axial direction.
With a band made of SUS having a, a backing plate 14 having an arcuate cross section for closing the opening 4a is adhesively fixed on the outer periphery of the gasket 3. The contact plate 14 may be welded to the inner peripheral surface of the one end portion 4b of the metal band 4 in the circumferential direction.

The fastener 5 is a first member which is welded to the outer peripheral surface of one end portion 4c of the metal band 4 in the circumferential direction and which extends in the axial direction.
The sidebar flange 6 is provided, and one end of a bolt 7 is welded and fixed to the sidebar flange 6 so as to be orthogonal to the axial direction. Two bolts 7 are arranged in the axial direction.

The plate-like flange into which the bolt 7 is loosely fitted has a first plate-like flange 8 whose inner end 8a is bent toward the first side bar flange 6 side, and the bolt 7 more than the plate-like flange 8. Of the flat plate-like second plate-like flange 9 located on the free end side of the. These plate-like flanges 8 and 9 are extended in the axial direction, and two bolts 7 are loosely fitted therein.

Further, the bolt 7 is provided more than the second plate-like flange 9.
The nut 10 is screwed onto the bolt 7 via a washer on the free end side of the. A cap 15 is attached to each of the bolts 7 to prevent it from coming off.

A second side bar flange 11 extending in the axial direction is welded to the outer peripheral surface side of the end 4b of the metal band 4, and each bolt 7 is fixed to the second side bar flange 11. A side plate 12 made of a pair of plates into which end portions are fitted is welded.

Sheets 13 made of water-expanded rubber are arranged on both sides of the inner periphery of the tapered one end 3b of the gasket 3 so as to extend in the axial direction. The sheet 13 of water-expanded rubber may be adhered to the end portion 3b of the gasket 3 with an adhesive in advance, but without adhering it, it is simply placed between the gasket end portions 3a and 3b when the pipe joint is fixed by winding. Even by itself, the frictional force acting between the sheet 13 and the end portion of the gasket does not cause a shift when tightening the metal band. The position of the water-expanded rubber sheet 13 on the gasket end portion 3b is selected so that the water-expanded rubber sheet 13 is located between the gasket end portions 3a and 3b which are overlapped with each other when the gasket 3 is wound around the pipe outer peripheral surface. .

By arranging the water-expanded rubber sheet 13 between the gasket ends 3a and 3b thus superposed, the gasket end 3a slides on the water-expanded rubber sheet 13 when the nut 10 is tightened. Water expansion rubber sheet 1
3 is always sandwiched between the gasket end portions 3a and 3b, does not separate from the superposed portion of the gasket 3, and has a sufficient water blocking effect.

Next, a method of connecting pipes using this pipe joint will be described. Two pipes 2, using this pipe fitting
When connecting two, the nut 10 is loosened with a bolt and the metal band 4 is widely opened, the centers of both pipes 2 and 4 are aligned, and the metal band 4 and the gasket 3 are attached to the outer peripheral surface of the pipe 2. Wrap around. At this time, the bolt 7 is fitted between the side plates 12.

Next, the first plate-shaped flange 8 is moved on the bolt 7 so that the bent end portion 8a is moved to the second side bar flange 1.
The metal band 4 is reduced in diameter by engaging with the outer end of the pipe 1 and tightening the nut 10, and the metal band 4 is piped via the gasket 3
It is fixed by tightening against.

In this case, the elements related to the tightening force on the pipe are the three elements of the diameter of the bolts, the pitch between the bolts and the plate thickness of the plate-like flange. The intermediate plate-like flange is used as the first plate-like flange 8. And the second plate-shaped flange 9 are divided into two pieces, the plate thickness of the plate-shaped flange 8 that requires bending is limited to the limit that allows bending, but the plate-shaped plate-shaped flange 9 has a thickness. Can have any thickness as necessary, and thus can prevent the pipe from coming off or leaking water due to the internal pressure of the pipe, and can have a sufficient plate thickness to obtain a necessary tightening force.

In addition to the purpose of connecting two pipes to each other, the pipe joint according to the present invention is a repair for repairing water leaks and water leaks in aged water pipes without water interruption. Can be used as metal fittings. Further, the joint of the present invention can be applied to a hard PVC pipe, a polyethylene pipe, etc. in addition to a steel pipe.

[0023]

As described above, according to the present invention, the plate-like flange loosely fitted to the bolt of the fastener is composed of two plate-like flanges, one of which has an inner end portion. Since it is bent toward the first sidebar flange side and can be engaged with the outer end of the second sidebar flange, and the other one is formed in a flat plate shape, The bent portion of the plate-like flange for engaging with the outer end of the sidebar flange of 2 can be formed by bending, and the tightening with the nut can be performed by setting the thickness of the flat-plate flange sufficiently large. The pressure can be increased, and even when it is used as a connection joint when the internal pressure of the pipe is high, it can have sufficient thrust resistance and a sealing function.

Further, by arranging a sheet made of water-expandable rubber between the both ends of the gasket which are overlapped with each other in the axial direction, even if the both ends of the gasket are slid relative to each other by tightening the nut, the water-expansion rubber is made. The sheet does not separate from the superposed portion of the gasket, and the sealing function can be increased by expanding the water-expandable rubber.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of one embodiment of the present invention.

FIG. 2 is a perspective view of the same embodiment.

FIG. 3 is a partial cross-sectional view showing the arrangement of a water-expanded rubber sheet.

[Explanation of symbols]

 1 Joint 2 Pipe 3 Gasket 4 Metal Band 5 Tightening Tool 6 First Sidebar Flange 7 Bolt 8 First Plate Flange 9 Second Plate Flange 10 Nut 11 Second Sidebar Flange 12 Side Plate

Claims (2)

[Claims] 1. A gasket, which is a strip-shaped member wound around an outer peripheral surface of a pipe and has taper at both ends in a circumferential direction, a metal band having elasticity capable of being wound around the outer periphery of the gasket, and the metal. The nuts are attached to both ends of the band in the circumferential direction and are provided with a plurality of bolts arranged in the axial direction and nuts screwed onto the bolts, and the metal band is wound around the outer circumference of the gasket. A fitting for a pipe having a fastening tool for fastening and fixing the metal band to the tube by making both ends of the metal band relatively close to each other and reducing the diameter of the metal band. Is a first sidebar flange extending in the axial direction fixed to one end of the metal band in the circumferential direction, and one end fixed to the first sidebar flange so as to be orthogonal to the axial direction. And a plurality of bolts arranged in the axial direction, a first plate-shaped flange in which the bolts are loosely fitted and whose inner end is bent toward the first sidebar flange, and the first plate. Second plate-shaped flange in which the bolt is loosely fitted on the free end side of the bolt with respect to the flange, and screwed onto the bolt on the free end side of the bolt with respect to the second plate-shaped flange Nut, an axially extending second side bar flange fixed to the other end of the metal band in the circumferential direction, and a middle fixed end side of the bolt fixed to the second side bar flange. And a side plate consisting of a pair of plates into which the parts of the first plate flange are fitted, the metal band is wound around the outer periphery of the gasket, and the bolt is fitted between the side plates. The end of the second sidebar flange By tightening the nut while remaining engaged on the side edges, the joint of the tube, characterized in that fastened to the metal band to the tube. 2. A sheet made of water-expandable rubber is axially arranged between the tapered both ends of which the gasket is wrapped around the outer peripheral surface of the pipe. Pipe fittings.