JP2004293696A - Joint structure for pipe - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a joint structure in which bending performance of a joint can be held either in being buried in the ground or in being covered by lining concrete. <P>SOLUTION: This joint structure is for connecting the pipes to each other while holding flexibility. It is opened at both ends, and a pipe connection part 1 to match outer diameter of the pipe to be connected is provided at one end, while a sleeve connection part 2 of larger diameter than outer diameter of the pipe connection part 1 is provided at the other. Elastic joint main bodies A1 and A2 each comprising the pipe connection part 1 and the sleeve connection part 2 connected by a flexible deformation part 3 are disposed to put the sleeve connection parts to face each other. The sleeve connection parts 2 are fixed to a sleeve A3 that is harder than the elastic joint main body by a band. The pipes P1 and P2 are inserted to the pipe connection parts at the elastic joint main bodies. The pipes are closed between their inserted ends, and the pipe connection parts are fastened to the pipes by a fastening band 4. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a joint structure for connecting pipes, and more particularly, to a joint structure for connecting and connecting pipes with flexibility.
[0002]
[Prior art]
A conventional joint structure for connecting pipes has pipe connecting portions 16 and 16 'at both ends as shown in FIG. 8, and a large-diameter bulging portion 17 is provided at an intermediate portion between the left and right pipe connecting portions 16 and 16'. The pipes P1 and P2 are inserted into the pipe connection sections 16 and 16 'at both ends, and the pipe connection sections are tightened from outside using a tightening band 18 and connected.
The connected pipes exhibit flexibility such as bending due to expansion and contraction of a large-diameter bulging portion provided in an intermediate portion of the rubber cylinder.
[0003]
When connecting pipes having the same inner diameter and different pipe thicknesses, for example, a fume pipe and a vinyl chloride pipe, the pipes are connected using a concrete or hard synthetic resin box.
It is not known about the existence of the above-mentioned prior art document information on the prior art.
[0004]
[Problems to be solved by the invention]
However, the above-described joint structure of the rubber cylinder has a problem that, when buried in the ground, an intermediate large-diameter bulged portion is crushed and deformed by earth pressure or the like, and it is difficult to secure sufficient bending performance. Having.
Of course, when the periphery (360 °) of the above-mentioned joint is rolled up with concrete, the large-diameter bulged portion of the rubber cylinder is compressed with concrete, and the function of the flexible joint is completely impaired.
[0005]
In addition, as a matter of course, the tub connection for connecting pipes having different outer diameters is not flexible and has a rigid structure.
[0006]
The present invention has been made in view of the above-mentioned problems of the related art, and the object thereof is to maintain the bending performance of the joint even when buried in the ground or rolled up with concrete. It is to provide a joint structure.
[0007]
[Means for Solving the Problems]
The technical means taken by the present invention to achieve the above object is a joint structure for connecting pipes while maintaining flexibility, with both ends opened, and the outer diameter of the pipe connected to one of them is reduced. Two elastic joint bodies each having a matching pipe connection portion and a sleeve connection portion having a diameter larger than the outer diameter of the pipe connection portion on the other side, and connecting the pipe connection portion and the sleeve connection portion by a flexible deformation portion. The parts are arranged facing each other, the two sleeve connecting parts are fixed to a sleeve having rigidity from the elastic joint body with a band, and the pipes are inserted into the pipe connecting parts of both elastic joint bodies, and both the pipes are inserted. The structure is characterized in that the ends are closed and a pipe connection portion is fastened to the pipe by a fastening band.
The elastic joint body is formed of a synthetic rubber having excellent weather resistance and chemical resistance.
The sleeve is made of a material having a higher rigidity than that of the elastic joint main body. As the material, for example, a steel sleeve is preferable.
[0008]
According to the above-mentioned means, since the left and right elastic joint bodies to which the pipes are attached are connected to the sleeve having rigidity than the elastic joint body, the outer shape of the sleeve connecting portion of the elastic joint body is protected by the sleeve. . Therefore, it is possible to prevent the sleeve connection portion of the elastic joint body from being crushed and deformed by earth pressure at the time of embedding or by rolling up the concrete, thereby ensuring sufficient bending performance.
[0009]
In the above-mentioned joint structure, the attachment position of the sleeve for connecting the elastic joint body may be either outside or inside the left and right sleeve connection portions.
That is, the sleeves for connecting the elastic joint bodies are fitted and arranged over the outer sides of the left and right sleeve connection portions, and the sleeve connection portions are press-fitted and fixed to the sleeve side from inside (claim 2).
Further, a sleeve for connecting the elastic joint body is fitted and arranged over the inside of the left and right sleeve connection portions, and the sleeve connection portion is press-fixed to the sleeve side from the outside (claim 3).
[0010]
Further, the space between the insertion ends of the pipes connected to the left and right elastic joint bodies is closed so that the fluid flowing through the pipe does not enter the sleeve connection portion of the large-diameter bulging portion. (4) A method of closing a rubber-like member by inserting it between the insertion end faces of the pipes (Claim 4), or closing the gap between the insertion end faces of the left and right pipes with tape, and using a sleeve on the outer surface of the pipe and the elastic joint body. A method of filling a space sectioned by the inner peripheral surface of the connection portion with a foam that is compressed and deformed by an external force (Claim 5).
According to the means of the fourth aspect, it is possible to prevent the intrusion of the fluid and maintain the bending performance, and also to prevent the pipe from being damaged by absorbing the plunging of the pipe.
According to the means of claim 5, since the space of the large-diameter bulging portion is filled with the foam, there is no room for a solid (for example, filth) flowing together with the fluid, and the bending performance is secured.
[0011]
Furthermore, the sleeve that connects the left and right elastic joint bodies is not limited to a straight type.For example, by using a stepped cylinder or a trumpet-shaped cylinder whose outer diameter changes, the inner diameter is the same and the outer diameter is Different pipes can be connected with flexibility (claim 6).
Further, by using a bend cylinder as the sleeve connecting the left and right elastic joint bodies, the pipes can be connected at an angle with flexibility.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is an explanatory view showing a construction example (inner stop type) of a joint structure according to the present invention. Pipes P1 and P2 connecting between manholes M are joint structures A, which are connected while maintaining flexibility. ing.
[0013]
As shown in FIG. 2, the joint structure A includes elastic joint bodies A1 and A2 that are fastened and fixed to the connecting portions of the connecting pipes P1 and P2, and a sleeve that is fixed over the elastic joint bodies A1 and A2. A3 and a rubber-like member A4 that closes a gap between the insertion end faces of the connected pipes P1 and P2.
[0014]
The elastic joint bodies A1 and A2 are formed in a cylindrical shape having both ends open using synthetic rubber (eg, EPDM: ethylene-propylene trimer) having excellent weather resistance and durability. A pipe connecting portion 1 adapted to the outer diameter of the pipes P1 and P2, a sleeve connecting portion 2 having a diameter larger than the inner diameter of the pipe connecting portion 1 at the other end, and a pipe connecting portion 1 and a sleeve connecting portion 2 Are connected by a flexible deformation portion 3.
[0015]
At the outer peripheral surface of the pipe connection portion 1 in the elastic joint bodies A1 and A2, a mounting recess of a tightening band 4 for fastening the pipe connection portion 1 to the pipes P1 and P2 inserted into the pipe connection portion 1. 5 is provided so that the fastening band 4 can be securely fastened and fixed without shifting. As the tightening band 4, a stainless steel band that is not easily rusted is preferably used. In addition, on the inner surface of the pipe connecting portion 1 that comes into contact with the pipes P1 and P2, an uneven ridge (fold) for strengthening tight integration with the pipe may be formed.
[0016]
The sleeve connecting portion 2 is formed in a straight cylindrical shape at a maximum diameter portion of a flexible deformable portion 3 having a substantially rectangular cross section and gradually increasing in diameter integrally connected to a side portion of the pipe connecting portion 1. On the inner peripheral surface of 2, an attachment recess 7 for an extension band 6 for press-fitting and fixing the sleeve connection portion 2 to a sleeve A3 disposed outside is provided. As a result, the sleeve connection portion 2 can be securely pressed and fixed to the sleeve A3.
Also, a plurality of protrusions 8 are formed on the outer peripheral surface of the sleeve connection portion 2. When the sleeve connection portion 2 is pressed against the sleeve A3 by the expansion band 6 from the inside, the protrusions 8 are crushed. Thus, the close fixation is effectively performed.
It is more preferable that the flexible deforming portion 3 is provided with a bent portion in order to smoothly perform the bending action.
[0017]
The sleeve A3 is formed of a material having a higher rigidity than the above-mentioned elastic joint bodies A1 and A2, for example, a steel pipe, and the entire length of the sleeve A3 is formed by connecting the elastic joint body A1 and the elastic joint body A2 to the sleeve connecting portion 2. The length should cover the range of both sleeve connections when the ends are butt-joined, thereby protecting the sleeve connection 2 from being deformed by external pressure. As a result, the bending performance of the flexible deformable portion 3 is maintained. Is done.
[0018]
The ring-shaped rubber member A4 inserted between the insertion end faces of the pipes P1 and P2 to be connected closes the gap between the insertion end faces of the pipes P1 and P2 connected to the elastic joint bodies A1 and A2, and is connected to the pipe outer surface. Prevents solid matter (dirt or the like in the case of sewage) flowing into the pipe together with the fluid from entering the space defined by the sleeve connection part.
The ring-shaped rubber member A4 functions as a cushioning material for preventing the end faces of the inserted pipes P1 and P2 from directly hitting each other and being damaged, in addition to the function described above.
Note that the ring-shaped rubber member A4 is not limited to a rubber plate, but may be a sponge material.
Further, the ring-shaped rubber member A4 may be formed integrally with the elastic joint main bodies A1 and A2 as shown in FIG. That is, an annular flange 9 that contacts the end faces of the pipes P1 and P2 to be connected may be continuously formed inside the side end of the sleeve connection portion 2.
[0019]
FIG. 4 shows an arrangement in which a sleeve A3 for connecting the elastic joint bodies A1 and A2 is arranged inside the sleeve connection portion 2 and the sleeve connection portion 2 is fixed by press-fitting from the outside to the sleeve A3 side (outside stop type). In this case, the mounting recess 11 of the tightening band 10 for fastening and fixing the sleeve connecting portion 2 to the sleeve A3 is formed on the outer peripheral surface of the sleeve connecting portion 2.
In addition, in the case of FIG. 4, the elastic joint bodies A1 and A2 that are fitted and connected to the outer peripheral surface of the sleeve A3 do not connect the end surfaces of the sleeve connection portions 2 but contact each other. It may be fixed apart.
[0020]
FIG. 5 is a view showing another embodiment in which the gap between the end faces of the pipes P1 and P2 connected to the elastic joint bodies A1 and A2 is closed, and the outer circumferential surfaces of the pipes P1 and P2 arranged with a predetermined gap are flexible. The gap is closed by winding a flexible film 12, and then a foam 13 is injected and filled into the space 14 defined by the outer peripheral surfaces of the pipes P 1 and P 2 and the sleeve connection 2. That is, the space portion 14 is filled with the foam 13 so that solid matter or the like does not enter the space portion 14, and when an external force is applied, the foam 13 filling the space portion 14 is compressed to form the elastic joint body A 1. , A2. The film 12 prevents the foam 13 injected and filled in the space portion 14 from flowing into the pipe through the gap between the end faces of the pipes P1 and P2. It may be applied over the surface. In addition, the material is not limited to a film, and any material can be used as long as the gap between the pipe end faces can be covered. The space 13 'defined by the flexible deformation portion 3 and the sleeve A3 of the elastic joint bodies A1 and A2 may be filled with the foam 13'.
[0021]
In the above-described embodiments, connection of pipes having the same outer diameter and inner diameter is performed. However, the joint structure of the present invention has the same inner diameter (L1 = L2) and different outer diameters (L3> L4). It can also be used to connect pipes of different thickness. Hereinafter, the embodiment will be described with reference to FIG.
The elastic joint body is A1 '. A2 'has a pipe connecting portion 1' having an inner diameter adapted to each outer diameter of pipes having different pipe thicknesses, for example, a fume tube P1 'and a vinyl chloride tube P2', and the sleeve connecting portion 2 'has the same diameter. Different diameters may be used. In the case of the same diameter, a straight sleeve A3 is used as in the above-described embodiment (see FIG. 6A), and in the case of different diameters, a stepped sleeve A3 'is used (FIG. 6). (See (b)), the elastic joint bodies A1 'and A2' are connected by either the outer stopper or the inner stopper. In the case of different diameters, the sleeve A3 'may have a trumpet shape.
[0022]
Further, the joint structure of the present invention is not limited to a form in which pipes are connected in a straight line, but can also be used when connecting pipes with a predetermined curvature.
This embodiment will be described with reference to FIG. 7. The difference from the above-mentioned linear connection is that the sleeve A3 connecting the left and right elastic joint bodies A1 and A2 is not straight but has a predetermined curvature. And the end faces of the left and right pipes P1 and P2 are cut obliquely (in the case of an elbow of about 120 degrees, the end faces are cut at 30 degrees), and a ring-shaped rubber member A4 is inserted between the end faces. It is mounted and closed in the same manner as described above, and the other configuration is the same as that of the previous embodiment.
[0023]
The joint structure of the pipe configured as described above is such that the sleeve connecting portions of the elastic joint bodies connected to the left and right pipes are connected by arranging a sleeve having rigidity outside the elastic joint body on the outside or inside, and thereby connecting the elastic joint bodies. The sleeve connection of the joint body is protected by the sleeve. Thereby, even when buried in the ground or laid on concrete, the sleeve connection portion is not deformed, retains the initial outer diameter, and is a flexible deformation portion provided between the pipe connection portion and the sleeve connection portion. Function can be secured.
Therefore, the bending performance of the pipe can be sufficiently ensured.
Further, in order to obtain the bending performance of the flexible deformable portion, it is necessary to provide a gap that allows bending between the insertion end faces of the connected pipes. However, if the gap is left open, the sleeve is inserted through the gap. Solid matter mixed with the fluid enters into the space between the connection portion and the outer peripheral surface of the pipe, which hinders the bending action. However, by interposing a rubber-like member between the insertion end faces of the pipes or by injecting and filling a foam into the space, it is possible to prevent solid matter from entering the space. Therefore, a stable flexible joint can be maintained for a long time.
[0024]
【The invention's effect】
The joint structure of the present invention can provide a joint structure capable of securing sufficient bending performance by the configurations of claims 1 to 3. Therefore, it is possible to provide a flexible joint that can withstand burying in the ground or laying concrete.
Further, according to the configuration of claims 4 and 5, solid substances in the fluid flowing through the pipe can be prevented from entering the sleeve connection portion in the joint structure, whereby stable bending performance can be secured. The end face of the pipe can be prevented from hitting and being damaged.
Furthermore, according to the configuration of the sixth aspect, it is possible to connect pipes having the same inner diameter and different outer diameters while securing bending performance, as described above.
According to the configuration of the seventh aspect, the connection of the pipe is not limited to a straight line, and the pipe can be bent and connected at a predetermined curvature while securing the bending performance.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram showing a construction example of a joint structure according to the present invention.
FIG. 2 is an enlarged sectional view showing a joint structure.
FIG. 3 is a partial cross-sectional view showing a modified example of a rubber-like member interposed between insertion end surfaces of connecting pipes.
FIG. 4 is a partial cross-sectional view showing an external stop type in which a sleeve is inserted and arranged inside an elastic joint body.
FIG. 5 is a partial cross-sectional view in which a space is filled by injecting and filling a foam into a sleeve connection portion.
6A and 6B are cross-sectional views showing a joint structure for connecting pipes of different diameters, in which FIG. 6A shows a form using a straight sleeve, and FIG. 6B shows a form using a stepped sleeve.
FIG. 7 is an external view showing a bending joint structure using a bend cylinder for a sleeve.
FIG. 8 is a sectional view showing a conventional joint structure.
[Explanation of symbols]
A: Joint structure A1, A2: Elastic joint body A3, A3 '... Sleeve A4: Ring-shaped rubber member P1, P2 ... Pipe 1: Pipe connection section 2: Sleeve connection section 3: Flexible deformation section 4: Tightening band 6 ... Band 12 ... Film 13 ... Foam 14: Space

Claims (7)

A joint structure for connecting pipes while maintaining flexibility, wherein both ends are open, and a pipe connection portion adapted to an outer diameter of a pipe connected to one end is larger than an outer diameter of the pipe connection portion to the other end. Two elastic joint bodies each having a sleeve connecting portion having a diameter, a pipe connecting portion and a sleeve connecting portion connected by a flexible deformable portion, and the sleeve connecting portions are arranged so as to face each other. A band is fixed to a sleeve which is more rigid than the main body, a pipe is inserted into a pipe connection portion of both elastic joint bodies, a gap between insertion ends of both pipes is closed, and a pipe connection portion is fastened to the pipe by a band. A pipe joint structure characterized by being tightened by: The joint structure for a pipe according to claim 1, wherein the sleeve is fitted and disposed over the outside of the two sleeve connecting portions, and the sleeve connecting portion is fixed to the sleeve by crimping with an expansion band. The joint structure for a pipe according to claim 1, wherein the sleeve is fitted over the inside of both sleeve connection portions, and the sleeve connection portion is fixed to the sleeve side by crimping with a tightening band. 2. The joint structure for a pipe according to claim 1, wherein a ring-shaped rubber member is sandwiched between said insertion end faces of said pipe for closing. 2. The pipe joint according to claim 1, wherein a gap between the insertion end faces of the pipe is closed with a film, and a space defined by an outer surface of the pipe and an inner peripheral surface of the elastic joint body is filled with a foam. Construction. The pipe joint structure according to claim 1, wherein the sleeve connecting the left and right elastic joint bodies is a stepped or trumpet-shaped tubular body, and connects pipes having the same inner diameter and different outer diameters. The pipe joint structure according to claim 1, wherein the sleeve connecting the left and right elastic joint bodies is a bend cylinder, and the pipes are connected at an angle.

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