JP2000130672A - Tube joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tube joint capable of pressure-connecting a packing wound on a tube body with no gap over the whole outer periphery and causing no water leakage and no immersion by being handled like the conventional tube joint without requiring any special action. SOLUTION: This tube joint is provided with a joint main body 1 having fastening flanges 12 protruded in the outer peripheral direction from both end sections of band-like members 1a, a watertight packing 2 inserted between the joint main body 1 and two tube bodies to be connected, fastening bolts 3 and nuts fastened via bolt holes formed on the flanges 12, and projections 14 protruded in the facing direction of the flanges 12 at the time of usage on the outside positions of the bolt holes on one or both of the flanges 12 of the joint main body 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe joint suitable for connecting two pipes, for example, for connecting watertight between corrugated pipes made of synthetic resin whose outer peripheral surface is formed in a corrugated shape. It is about.

[0002]

2. Description of the Related Art Conventionally, various types of pipe joints of this type have been manufactured and used. Among these, representative pipe joints are shown in FIGS. The pipe joint shown in FIG. 11 is obtained by forming the wide band-shaped member 1a of the joint main body 1 into a semicircular shape from the beginning, and the pipe joint shown in FIG. It is formed into a flat shape with a material having the following.

[0003] For example, the former joint body 1 is composed of two upper and lower members in the form of a half-split arc, and has fastening flanges 12, which protrude in the outer peripheral direction at both ends 11, 11. An angle-shaped metal fitting provided with 12 is integrally connected, and the flanges 12 have a structure in which bolt holes 13 are formed at a plurality of positions in the width direction. It comprises a joint body 1 having such a structure, a watertight packing 2 wound around the outer periphery of a pipe to be connected, and a plurality of sets of bolts 3 and nuts 4 for tightening the flanges 12, 12. The latter joint body 1 is used in an arc shape along the pipe at the time of use. Other points are
Same as the former.

In order to use a pipe joint having such a structure, two pipe ends to be connected are brought into contact with each other, a watertight packing 2 is wound around both outer peripheral surfaces thereof, and the outer peripheral portion thereof is wound around the outer peripheral portion. The two half-shaped joint bodies 1 and 1 are vertically arranged facing each other, and a tightening bolt 3
Through the bolt holes 13, 13 formed in the opposed flanges 12, 12, and tighten the nut 4.
And secure it with.

[0005]

However, FIG.
As shown in FIGS. 1 and 12, in these conventional pipe joints, when the opposed flanges 12 and 12 are tightened by bolts 3 and nuts 4, respectively, the outside of the flanges 12 and 12 is caused by the tensile resistance of the band-shaped member 1a. The portion gradually inclines in the tightening direction, and the outer ends of the flanges come into contact with each other in advance, as shown in the figure, and even when further tightening work is performed, the base ends of the flanges 12, 12 are brought close to each other. It was extremely difficult. In particular, in this case, as shown in the figure, the distal end portion of the angle-shaped metal fittings constituting the flanges 12 and 12 fixed to the band-shaped member 1a is in a posture of jumping up with the inclination of the flange, and the joint body 1 and the packing 2 are connected to each other. Gaps s, s are likely to occur between them. Due to this phenomenon, the packing 2 at the portion where the gaps s and s are generated does not receive the tightening pressure, so that it is difficult to maintain the water-tight state at this portion, often causing water leakage or inundation from the outside.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve the problems of the conventional pipe joint, and handle the same as the conventional pipe joint without any special operation. The packing 2 wound around the pipe body can be brought into pressure contact with the entire outer periphery without forming a gap, so that the pipe joint is free from water leakage and flooding. Is provided here.

[0007]

The structure of the present invention for achieving the object will be described with reference to the reference numerals used in the description of the embodiments. The structure of the pipe joint according to the present invention is a belt-like member 1a.
Watertight between the joint body 1 having the fastening flanges 12, 12 protruding from the both end portions 11, 11 toward the outer peripheral direction and two pipes to be connected to the joint body 1. Packing 2 and the flanges 12, 12
A bolt 3 and a nut 4 for tightening through the bolt holes 13 formed in the joint body 1. One or both of the two flanges 12, 12 in the joint body 1 are located outside the bolt hole 13. In use, the flanges 12, 12 are provided with a projecting body 14 projecting in a direction facing each other.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In implementing such a pipe joint, one of the free ends 11 of the joint main body 1 protrudes toward the inner peripheral surface of the other free end 11. The joint body 1 may be provided with an overlapping portion 15, or may be implemented as a single body, formed in an annular shape and connected at one location in the circumferential direction, or the joint body 1 may be divided into two parts. The body can be embodied as being annularly opposed and connected at two points in the circumferential direction. Further, the joint body 1 can be embodied as a structure in which the watertight packing 2 is fixed to the inner surface thereof in advance, or a structure in which one end of the watertight packing 2 is locked.

The material of the joint main body 1 according to the present invention is not particularly limited, but may be formed by welding an iron plate and an iron angle to be integrally formed, for example, polyethylene, polypropylene, polyvinyl chloride or the like. It is preferable to use a thermoplastic synthetic resin material or an FRP or the like in which the resin material is reinforced with glass fiber, which is hardly deteriorated with time and excellent in tensile strength.

In implementing the joint body 1, the band-shaped member 1a, the flange 12, and the protruding body 14, which are referred to in the above-mentioned constitutional requirements, are formed separately from each other, and are respectively screwed and riveted. Affixing by an appropriate securing means such as welding or use of an adhesive,
And the flange 12 are integrally formed to fix the protruding body 14 or, for example, to the protruding body 1 with respect to a pipe joint having a conventional structure.
4 is fixed, or conversely, the one in which the flange 12 and the protruding body 14 are integrally formed is fixed to the band-shaped member 1a, and further, the whole is integrally formed. be able to.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 6 are views showing a first embodiment of the pipe joint according to the present invention. FIG. 1 is a perspective view showing the overall shape, and FIGS. 2 and 3 show a side shape and a front shape showing a state of being attached to a tubular body. FIG.
5 and FIG. 5 are a plan view and a front view for explaining the joint body. FIG. 6 is an explanatory view in which an intermediate portion in FIG. 5 is cut and both end portions are enlarged.

The joint main body 1 shown in this embodiment is a half-split body which is split into upper and lower halves, and as shown particularly clearly in FIGS. One plane of an angle plate a formed in an L-shape in side view is connected to both ends 11, 11 of the member 1a.
The reinforcing flange b is connected to the rear side of the flange that has risen in the shape of a letter and has fastening flanges 12, 12.
Bolt holes 13 for tightening are formed at substantially middle portions in the height direction of the flanges 12 of the joint body 1 at four positions in the longitudinal direction in the embodiment. Also, at the top of the outward faces of the respective flanges 12, 12, that is, at positions outside the bolt holes 13 at the time of use, the projections 14, 14 of an appropriate width are provided at the faces where the flanges 12, 12 face each other at the time of use. 14 is connected in a protruding manner.

In the joint body 1, each of the band-shaped member 1a, the angle plates a and the plates b, and the projections 14 are formed of FRP material. The watertight packing 2 interposed between the two pipes P to be connected to the joint body 1 is formed by a foam sheet having a length and a width substantially equal to those of the band-like member 1a. is there.

In using such a pipe joint, first, two pipes P, P to be connected are arranged in abutting manner, and the watertight packing 2 made of a foam sheet is provided on the outer peripheral surface thereof. The upper and lower two strip-shaped materials 1a, 1a are arranged on the outer peripheral surface thereof, and as shown in FIG. 2, the overlapping portions 15, 15 extended to one end side of each of the strip-shaped members 1a are opposed to each other. Are fastened with bolts 3 and nuts 4 through bolt holes 13.

At this time, when the bolt 3 and the nut 4 are sequentially tightened, the flanges 12 and 12 come close to each other and the two opposing protrusions 14 and 14 come into contact with each other. When further tightened from this state, the upper and lower flanges 12, 12 with the contact surfaces of the protrusions 14, 14 as fulcrums,
The belt-like member 1a is sequentially inclined in a direction of approaching, and FIGS.
And the entire peripheral surface of the packing 2 is compressed.

With regard to the pipe joints shown in the embodiment, for example, the approximate values of those used for a pipe P having an outer diameter of 700 mmφ are shown as follows.
m, width W = 560 mm, thickness T = 2 mm, height h of the angle plate a = 50 mm, width w = 40 mm, thickness t of the flange 12 combined with the reinforcing plate t = 10 mm, and protrusion width p of the protrusion 14 = 5 mm And With this, it was possible to obtain the tightened state shown in FIG.

In the joint body 1 of the second embodiment shown in FIGS. 7 and 8, the entire angle-shaped member forming the flange 12 is integrally formed, and the protruding body 14 is formed on one of the flanges 1.
This is a structure in which only 2 is bonded and formed. Other points are the same as those in the first embodiment.

In the joint body 1 according to the third embodiment shown in FIGS. 9 and 10, the entire belt-shaped member 1a, the flange 12, the protruding body 14, and the overlapping portion 15 are integrally formed of FRP material. It is a structure. Other points are the same as those in the first embodiment.

Although the embodiments which are considered to be representative of the present invention have been described above, the present invention is not necessarily limited only to the structures of these embodiments. For example, the joint main body 1 is formed in a half-split shape. Not only that,
It can be embodied as a single body with a length that can be wound in the shape of a letter, and for large-diameter pipes, it should be divided into four parts and used by being applied to the pipe from four directions. The present invention can also be implemented as a form, and can be implemented with appropriate modification within the range having the above-described constituent features of the present invention, achieving the object of the present invention, and having the following effects. Things.

[0020]

As is clear from the above description, the pipe joint according to the present invention has a structure in which the flanges formed at both ends of the band-like member for tightening the pipe are formed by using the flanges whose tip portions face each other in use. Since the protruding body comes into contact beforehand to prevent further approach, and the contact portion is used as a fulcrum so that the subsequent fastening force is concentrated on the belt-shaped member side. Since the tightening force of the bolts and nuts can be exerted over the entire circumference of the pipe, the pipes can be easily and quickly brought into a watertight state by the same operation as the installation of conventional pipe joints. It has a remarkable effect that a connection can be made.

[Brief description of the drawings]

FIG. 1 is an overall perspective view showing a pipe joint according to a first embodiment.

FIG. 2 is a side view showing a use state of the pipe joint.

FIG. 3 is a front view of FIG. 2;

FIG. 4 is a plan view of a joint main body.

FIG. 5 is a front view of FIG. 4;

FIG. 6 is an enlarged view of the middle part omitted in FIG. 5;

FIG. 7 is a side view of a portion corresponding to FIG. 2 showing the pipe joint of the second embodiment.

FIG. 8 is an enlarged view of a portion corresponding to FIG. 6 of the embodiment.

FIG. 9 is a side view of a portion corresponding to FIG. 2 showing the pipe joint of the third embodiment.

FIG. 10 is an enlarged view of a portion corresponding to FIG. 6 of the embodiment.

FIG. 11 is a side view showing a use state of a conventional structure.

FIG. 12 is a side view showing a use state of another conventional structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Joint main body 1a Strip-shaped member 11 End of strip-shaped member 12 Flange 13 Bolt hole 14 Projection 15 Overlapping part 2 Packing 3 Bolt 4 Nut s Clearance

Claims (5)

[Claims] The fastening flanges (12), (1) projecting from both ends (11), (11) of the belt-shaped member (1a) toward the outer peripheral direction.
Watertight packing interposed between the joint body (1) provided with 2) and two pipes to be connected to the joint body (1)
(2) and bolt holes formed in the flanges (12), (12)
(13), comprising a tightening bolt (3) and a nut (4) for tightening via (13), and one or both of the two flanges (12) and (12) in the joint body (1) are Bolt hole
A pipe joint comprising a projection (14) at the outer position of (13), in which flanges (12), (12) project toward each other in use when used. 2. A free end (11) of one of the joint body (1).
2. The pipe joint according to claim 1, further comprising an overlapping portion (15) protruding toward the inner peripheral surface of the other free end (11). 3. 3. The pipe joint according to claim 1, wherein the joint body (1) is a single body, is formed in an annular shape, and is connected at one point in a circumferential direction. 4. The pipe joint according to claim 1, wherein the joint body (1) is a two-piece body, which is annularly opposed to each other and connected at two points in a circumferential direction. 5. The pipe joint according to claim 1, wherein the joint body (1) is provided with a watertight packing (2) previously fixed to an inner surface thereof.