JP6742709B2 - Expansion joint structure and construction method - Google Patents

Description

The present invention has a first pipe and a second pipe, and a joint sleeve that connects the first pipe and the second pipe and is provided on the outer periphery of the first pipe and the second pipe via a cylindrical rubber packing. The present invention relates to an expansion joint structure, and more particularly to an expansion joint structure capable of reliably absorbing a deviation between the first pipe and the second pipe without causing a tightening failure.

Conventionally, it has a first pipe, a second pipe, and a joint sleeve that connects the first pipe and the second pipe and is provided on the outer periphery of the first pipe and the second pipe via a cylindrical rubber packing. Expansion joint structures are known. In this case, the joint sleeve is composed of two sleeve members that are split into two along the circumferential direction.

Such expansion joint structures are used to carry a variety of fluids, but are often used in particularly corrosive environments.

For this reason, among the expansion pipe joint structures, it is considered to use a plastic sleeve as the joint sleeve.

When assembling the expansion pipe joint structure, first, the first pipe and the second pipe are prepared, and the two sleeve members are arranged around the outer periphery of the first pipe and the second pipe with the cylindrical packing interposed. Next, the expansion pipe joint structure can be obtained by tightening both ends of the two sleeve members with tightening bolts.

JP, 7-19388, A

By the way, generally, the two sleeve members are made of metal such as SUS, and their shapes are substantially the same before and after tightening. Therefore, when the two sleeves clamp the member, the cylindrical packing may be sandwiched between the two sleeve members, resulting in a defective tightening.

The present invention has been made in view of the above points, and an object thereof is to provide an expansion pipe joint structure that does not cause defective tightening and can reliably absorb a shift due to aging. To do.

The present invention connects a first pipe, a second pipe, the first pipe and the second pipe, and is provided on the outer periphery of the first pipe and the second pipe via a cylindrical rubber packing. With a fitting sleeve,
The joint sleeve has a plurality of sleeve members divided in the circumferential direction, and both end portions of each sleeve member are fastened to the end portions of the adjacent sleeve members by tightening bolts, and each sleeve member is made of an elastic material. The expansion pipe joint structure is characterized in that it has an inner surface forming a part of a circular shape after tightening, and the inner surface of each sleeve member has a larger radius of curvature before tightening than the inner surface after tightening.

The present invention is the expansion joint, wherein the joint sleeve is made of hard plastic.

The present invention is an expansion joint, wherein the first pipe and the second pipe are made of hard plastic.

As described above, according to the present invention, it is possible to reliably absorb a shift due to secular change without causing a tightening failure.

1(a), (b) and (e) are front views showing the tightening action of the expansion joint structure according to the present invention. 2A and 2B are side sectional views showing the tightening action of the expansion joint structure. 3(a), (b) and (c) are front views showing the tightening action of the expansion joint structure as a comparative example.

Embodiments of an expansion joint structure according to the present invention will be described below with reference to the drawings.
Here, FIGS. 1(a), (b) and (c) are front views showing the tightening action of the expansion joint structure according to the present invention, and FIGS. 2(a) and (b) are side sectional views showing the tightening action of the expansion joint structure. 3(a), (b) and (c) are front views showing the tightening action of an expansion joint structure as a comparative example.

As shown in FIGS. 1 and 2A and 2B, the expansion joint structure 10 connects the first pipe 1, the second pipe 2, the first pipe 1 and the second pipe 2, and The first pipe 1 and the second pipe 2 are provided with a cylindrical joint sleeve 3 provided on the outer peripheries thereof through a cylindrical rubber packing.

The expansion joint structure 10 having such a configuration is installed in a strong corrosive environment, for example, seawater. Therefore, both the first pipe 1 and the second pipe 2 are made of FRP (fiber reinforced plastic).

Further, the joint sleeve 3 has a plurality of, for example, a pair of sleeve members 3a, 3b which are split into two, which are divided into two in the circumferential direction.

The sleeve member 3a has both end portions 13a and 13a along the circumferential direction, and the sleeve member 3b also has both end portions 13b and 13b along the circumferential direction.

Both ends 13a, 13a of the sleeve member 3a face both ends 13b, 13b of the sleeve member 3b.

Further, each of the sleeve members 3a and 3b is made of an elastic body such as FRP (fiber reinforced plastic) like the first pipe 1 and the second pipe 2.

Further, of the pair of sleeve members 3a and 3b, both end portions 13a and 13a of one sleeve member 3a are fastened to both end portions 13b and 13b of the other sleeve member 3b with fastening bolts 15 and 15, respectively.

Furthermore, the inner surface of each sleeve member 3a, 3b has a larger radius of curvature before tightening than the inner surface after tightening. That is, the inner surface of each sleeve member 3a, 3b has a part of a circle corresponding to the outer surface of the tightened cylindrical rubber packing 5, that is, a semicircular shape after tightening. The outer surface of the cylindrical rubber packing 5 has a circular shape before and after tightening, but the outer surface after tightening has a smaller diameter than the outer surface before tightening.

Further, before tightening, the inner surface of each sleeve 3a, 3b has a larger radius of curvature than the inner surface after tightening, that is, a semi-circular radius of curvature. Therefore, the inner surface of each sleeve 3a, 3b before tightening has a shape in which both end portions 13a, 13a and 13b, 13b are slightly expanded with respect to the inner surface of each sleeve 3a, 3b after tightening.

Therefore, before tightening, the inner surface of each sleeve 3a, 3b has a larger radius of curvature than the radius of curvature of the outer surface of the rubber packing 5 before tightening.

Next, the operation of the present embodiment having such a configuration will be described with reference to FIGS.

First, the first pipe 1 and the second pipe 2 are prepared. Next, a cylindrical rubber packing 5 is fitted around the outer circumferences of the first pipe 1 and the second pipe 2. Here, as the cylindrical rubber packing 5, an SBR rubber packing can be used, and the rubber packing 5 is fitted on the outer circumference of the first pipe 1 to the second pipe 2.

Next, the pair of sleeve members 3a and 3b are fitted on the outer periphery of the rubber packing 5. In this case, both ends 13a, 13a of the sleeve member 3a are arranged to face both ends 13b, 13b of the sleeve member 3b (see FIG. 1A). In addition, the inner surface of each sleeve member 3a, 3b has a larger radius of curvature than the outer surface of the cylindrical rubber packing 5, so that the inner surface of each sleeve member 3a, 3b has both ends 13a, 13a of each sleeve member 3a, 3b. It goes away from the rubber packing 5 toward the 13b, 13b side.

Next, as shown in FIG. 1(b), tightening bolts 15 and 15 are attached by penetrating both end portions 13a and 13a of one sleeve member 3a through both end portions 13b and 13b of the other sleeve member 3b. Tighten the bolts 15, 15.

In this case, each sleeve member 3a, 3b is deformed so that both end portions 13a, 13a and both end portions 13b, 13b of each sleeve member 3a, 3b approach each other.

After that, as shown in FIG. 1C, when the tightening work of the tightening bolts 15 and 15 is completed, the both end portions 13a and 13a of the sleeve member 3a come into contact with the both end portions 13b and 13b of the sleeve member 3b. The inner surface of each of the sleeve members 3a and 3b has substantially the same shape as the outer surface of the cylindrical rubber packing 5 after tightening.

Therefore, the sleeve members 3a and 3b are in contact with the outer surface of the rubber packing 5 over the entire inner surface thereof, and the sleeve members 3a and 3b reliably connect the first pipe 1 and the second pipe 2 via the rubber packing 5. be able to.

In this way, the joint sleeve 3 can be formed by the pair of sleeve members 3a and 3b, and the expansion joint structure 10 including the first pipe 1, the second pipe 2 and the joint sleeve 3 is formed.

The expansion joint structure 10 may shift as it ages. When the expansion joint structure 10 shifts in the axial direction or the circumferential direction, the first pipe 1 or the second pipe 2 slides in the joint sleeve 3 in the axial direction or the circumferential direction. As a result, it is possible to reliably absorb the displacement of the expansion joint structure 10 in the axial direction or the circumferential direction.

Next, a comparative example with respect to the present invention will be described with reference to FIGS.

In this comparative example, each sleeve 3a, 3b is made of metal such as SUS, and the inner surface of each sleeve 3a, 3b does not change before and after tightening, and the inner surface shape of each sleeve 3a, 3b is semicircular. Other configurations are substantially the same as those of the embodiment shown in FIGS. 1(a) to 1(c).

In the comparative example shown in FIGS. 3A to 3C, the same parts as those of the embodiment shown in FIGS. 1A to 1C and FIG. 2 are denoted by the same reference numerals and detailed description thereof will be omitted.

As shown in FIG. 3A, the sleeve members 3a and 3b are arranged on the outer circumferences of the first pipe 1 and the second pipe with a cylindrical rubber packing 5 interposed therebetween. In this case, the inner surface of each sleeve member 3a, 3b before tightening has the same shape as the inner surface of the sleeve member 3a, 3b after tightening, and the inner surface shape slightly larger than the outer surface of the cylindrical rubber packing 5 before tightening. Hold.

Therefore, each sleeve member 3a, 3b abuts the rubber packing 5 at both end portions 13a, 13a and 13b, 13b, but the central portion thereof is separated from the rubber packing 5.

In this state, tightening bolts 15 are attached to both ends 13a, 13a and 13b, 13b of each sleeve member 3a, 3b to tighten each sleeve member 3a, 3b (FIG. 3(b)). In this case, the rubber packing 5 is sandwiched between both end portions 13a, 13a and 13b, 13b of the sleeve members 3a, 3b, and the protruding portion 5a of the rubber packing 5 is formed.

Next, when the tightening of the sleeve members 3a, 3b by the tightening bolts 15 is completed, the sleeve members 3a, 3b are tightened with the protruding portions 5a remaining between the both end portions 13a, 13a and 13b, 13b. A defect occurs (FIG. 3(c)).

On the other hand, according to the present invention, the inner surface of each sleeve member 3a, 3b before tightening has a larger radius of curvature than the inner surface of each sleeve member 3a, 3b before tightening and the outer surface of the rubber packing 5 before tightening. The central portions of the sleeve members 3a and 3b are in contact with the rubber packing 5, but are separated from the rubber packing 5 toward both ends 13a, 13a and 13b, 13b of the sleeve members 3a and 3b.

Therefore, even when the tightening bolts 15 are attached to both ends 13a, 13a and 13b, 13b of each sleeve member 3a, 3b to tighten each sleeve member 3a, 3b, both ends 13a, 13a of each sleeve member 3a, 3b and The rubber packing 5 is not sandwiched between the 13b and 13b, and the tightening failure does not occur (see FIGS. 1A, 1B and 1C).

1 1st piping 2 2nd piping 3 Joint sleeve 3a Sleeve member 3b Sleeve member 5 Cylindrical rubber packing 15 Tightening bolt

Claims (4)

The first pipe,
Second piping,
While connecting the first pipe and the second pipe, a joint sleeve provided on the outer periphery of the first pipe and the second pipe via a cylindrical rubber packing,
The joint sleeve has a plurality of sleeve members divided in the circumferential direction, and both end portions of each sleeve member are fastened to the end portions of the adjacent sleeve members by tightening bolts, and each sleeve member is made of an elastic material. The inner surface of each sleeve member has a larger radius of curvature before tightening than the inner surface after tightening, and the cylindrical rubber packing is housed in the joint sleeve. And is integrally configured so as to extend in the axial direction from the first pipe to the second pipe,
The first pipe and the second pipe slide on the rubber packing in the axial direction with respect to the joint sleeve, and the cylindrical rubber packing has the first pipe and the second pipe with respect to the joint sleeve. When sliding on the rubber packing in the axial direction, the fluid leaking from the joint between the first pipe and the second pipe is sealed, and the inner protrusion of the integrally formed rubber packing is An expansion joint structure, characterized in that the joint sleeve is fitted to the joint between the first pipe and the second pipe, and the joint sleeve does not engage with the first pipe and the second pipe . The expansion joint structure according to claim 1, wherein the joint sleeve is made of hard plastic. The expansion pipe joint structure according to claim 1 or 2, wherein the first pipe and the second pipe are made of hard plastic. A step of preparing the first pipe and the second pipe,
A step of fitting a cylindrical rubber packing on the outer periphery of the first pipe and the second pipe;
The step of fitting a joint sleeve composed of a plurality of sleeve members divided in the circumferential direction onto the outer circumference of the cylindrical rubber packing, wherein the radius of curvature of the inner surface of each sleeve member is the outer surface of the cylindrical rubber packing. Process that is larger than the radius of curvature of
Tightening both ends of each sleeve member to the ends of the adjacent sleeve members with tightening bolts, whereby the inner surface of each sleeve member after tightening has the same shape as the outer surface of the cylindrical rubber packing. ,
The cylindrical rubber packing is housed in the joint sleeve and is integrally configured so as to extend in the axial direction from the first pipe to the second pipe,
The first pipe and the second pipe slide on the rubber packing in the axial direction with respect to the joint sleeve, and the cylindrical rubber packing has the first pipe and the second pipe with respect to the joint sleeve. When sliding on the rubber packing in the axial direction, the fluid leaking from the joint between the first pipe and the second pipe is sealed, and the inner protrusion of the integrally formed rubber packing is A method for constructing an expansion joint structure , wherein the joint sleeve is fitted to a joint between the first pipe and the second pipe, and the joint sleeve does not engage with the first pipe and the second pipe .

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