JP2001263552A - Piping method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a piping method for an underground piping being lightweight, having superior workability, minimum steps in a pipe inside face, and superior corrosion resistance, when laying a large-diameter pipe such as a sewerage by an open cut method. SOLUTION: This piping method is so formed that conduits are laid from one of adjoining manholes to the other opposite to each other, a short pipe having a same diameter as the conduit pipe and a length approximately same as a clearance is inserted in the clearance formed between the pipe end faces of the respective conduits opened oppositely, a spacer is formed in the bottom of the short pipe, and the conduit pipe and the short pipe are integrally covered and fitted by a collar.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a piping method for connecting pipes that are already arranged and fixed when laying a large-diameter pipe such as a sewer pipe by an open-cutting method.

[0002]

2. Description of the Related Art Conventionally, when laying a large-diameter pipeline such as a sewer pipe by an open-cutting method, the pipelines are laid at the same time in opposition from adjacent manholes toward each other, and the pipelines are connected. There is a method of laying pipes that are then used as sewer pipes. In this case, the pipelines laid opposite to each other must be connected at a joint point, but the respective pipelines are already arranged and fixed, so-called hell piping. For this reason, a method of inserting a short pipe having the same length and the same diameter as the gap into the gap between the pipe ends of the opposed pipes and joining the pipe to the pipe may be adopted.

[0003] As a connection method, for example, there is a method of joining an inserted short pipe and an already arranged pipe pipe by FRP hand lay-up or the like, but construction is impossible in a spring area. In addition, in order to exert uniform strength in the axial direction, a high level of skill is required, and there is a problem that it is difficult to guarantee the joining quality because it is performed on site. There is also a method in which the gap between the short pipe and the existing pipe is fitted with rubber packing or the like, and the entire joint is covered and buried with concrete.However, the weight of the entire joint becomes large, and it is not appropriate in places with soft ground. There is a danger of sinking.

[0004] In addition, there is a case where a method is adopted in which an iron cladding tube that covers the entire gap of the joint portion is fitted over a pipe line already arranged. This method has good workability, but the inner diameter of the cladding pipe is larger than the outer diameter of the already installed pipe, so that there is a step on the inner surface of the connected sewer pipe, and the weight of the joint is heavy and soft. Uneven settlement may occur on the ground,
There is a possibility that soil contamination may occur due to tar and the like used for anticorrosion.

[0005]

SUMMARY OF THE INVENTION The pipe connection method of the present invention provides a piping method for hell piping which is lightweight, has good workability, minimizes the step on the inner surface of the pipeline, and has excellent corrosion resistance. is there.

[0006]

According to a piping method of the present invention for solving the above-mentioned problems, in a piping method for laying a pipeline by an open-cutting method, one of adjacent manholes faces each other toward the other manhole. Laying pipes, inserting short pipes of the same diameter as pipe pipes and lengths that are approximately the same as the gap lengths into gaps formed between the pipe end faces of the pipes that are opened facing each other. This is a piping method in which a spacer is provided below the short pipe and the conduit pipe and the short pipe are integrally fitted with a collar.

(Action) In the present invention, the short pipes arranged in the gaps between the already arranged pipe pipes have substantially the same length as the gaps, and the spacers provided below the short pipes are covered. Since the short pipe is supported between the fitted collars, the inserted short pipe does not go down even after the sewer pipe is joined, so that a step does not occur in the sewer pipe.

[0008]

Embodiments of the present invention will now be described in detail with reference to the drawings.

FIG. 1 is a sectional view showing a state of a pipe line joined by the pipe joining method of the present invention. Pipe A and Pipe B
Is a pipeline that has been laid opposite to the adjacent manhole. A short pipe 1 is disposed in a gap between the pipe A and the pipe B, and is connected to the pipe A and the pipe B by a collar 2. The collar 2 includes a water stop ring 41 and a sand biting prevention ring 4 attached to respective pipe ends of the pipe A and the pipe B.
2. The pipeline is sealed via the joint filling ring 43.
A spacer 3 is provided in a gap formed between the lower part of the short pipe 1 and the collar 2 to prevent the short pipe 1 from shifting downward and forming a step on the inner surface of the sewer pipe after connection. . The outer surface of the collar 2 has a projection 21 for locking a pulling tool for moving the collar during construction.
Is provided.

The material of the collar 2 is not particularly limited as long as it is lightweight, has corrosion resistance and is excellent in strength. For example, a fiber-reinforced synthetic resin such as FRP or FRCP is preferably used. The material of the short tube 1 is not particularly limited as long as it is made of corrosion-resistant material, has excellent abrasion resistance, and is light in weight.
RCP pipes, resin-lined steel pipes and the like are preferably applied.
If both are made of the same material as the conduit pipes A and A ', the flow resistance of the sewage is the same as that of the conduit pipes, and the strength is easily uniform, which is more preferable.

The spacer 3 prevents the short tube 1 from being displaced. Therefore, the material is not particularly limited as long as it is excellent in compressive strength and corrosion resistance. Examples of the material include synthetic resin foam, fiber-reinforced synthetic resin foam, preservative-treated wood, stainless steel, and aluminum. And the like can be used.

When the shape of the spacer 3 has a curvature that matches the outer diameter curvature of the short pipe 1, a gutter-like long object (FIG. 2)
(A)) or a rod-shaped cross section (FIG. 2).
2 (b)), a block shape (see FIG. 2 (c)), etc., which supports the short tube 1 by covering the lower portion of the short tube 1 (see FIG. 3 (a)) or a partially short tube. 1 (see FIG. 3C). In the case of the long shape, it is arranged at the lower part of the short tube 1 so that the longitudinal direction is parallel to the tube axis, and the number thereof is stabilized by using at least two tubes without rolling left and right in the collar 2. , Are spaced apart. In the case of the block shape, it may be arranged at the lower end of both ends of the short tube 1 and, if necessary, also at the lower center of the short tube 1, and the number thereof is appropriately determined so as to be stable without rolling left and right in the collar 2. good. The thickness of the spacer 3 is
The thickness is equivalent to the height of the higher one of the water stop ring 41, the sand biting prevention ring 42, and the joint filling ring 43. For example, in the case of a sewer pipe having an inner diameter of 2200 mm, it is generally about 20 to 30 mm.

The spacer 3 must not be displaced when the collar 2 is fitted, and the position of the short tube 1 must not be unstable.
Therefore, as a fixing method, the spacer may be bonded and fixed to the short pipe 1, or in the case of a long spacer, may be fixed to the joint filling ring 43 fixed to the pipes A and B on both sides by pressing. The main purpose of the spacer 3 is to prevent the short pipe 1 from shifting downward. However, in order to prevent the ground from vibrating, unequal subsidence, or shifting upward, the spacer 3 is also provided on the left, right, upper part of the short pipe 1. May be. (See FIGS. 3B and 3D)

A water blocking ring 41, a sand biting prevention ring 42,
The material and shape of the joint filling ring 43 are not particularly limited, and a general one can be applied as it is. In addition, pipe A,
The method of fixing to B is not particularly limited as long as a general fixing method using an adhesive can be applied as it is.

FIG. 4 shows the procedure of the pipe joining method of the present invention.
(A) and FIG. 4 (b). First, as shown in FIG. 4 (a), the collar 2 is inserted into the pipe A side, and the water stop ring 41 and the sand biting prevention ring 4 are provided at the pipe ends of the pipe A and the pipe B.
2. The joint filling ring 43 is adhesively fixed. Subsequently, as shown in FIG. 4B, a short pipe 1 cut to the length is disposed in a gap between the pipe A and the pipe B, and a spacer 3 is attached to a lower portion of the short pipe 1. . The short pipe 1 has a jack 5 placed on a scaffold plate 51 (or a scaffold rod) passed over a scaffolding support rod 52 passed in a diametric direction in each of the pipe A and the pipe B. The lower inner surface height is slightly higher (5-10 mm) than the lower height of the water stop ring 41, the sand biting prevention ring 42, and the joint filling ring 43 fixed to the pipelines A and B. Degree) and suspended.

In this state, as shown in FIG. 4B, the pulling tool 53 (in this example, a wire rope) is hooked on the projection 21 for locking the pulling tool 53 attached to the outside of the collar 2. , Is moved to the pipe B side by a winch (not shown), and the sand biting prevention ring 42, the water blocking ring 41, and the joint filling ring 4 completely fixed to the pipes A and B
3 is fitted. At this time, since the spacer 3 is slightly above the lower inner surface of the collar, it does not hinder the movement of the collar. Thereafter, the jack 5 is removed, and the scaffold plate 51 and the scaffold support rod 52 in the pipeline A and the pipeline B are carried out of the pipe, and the joining is completed as shown in FIG.

[0017]

As described above, according to the piping method of the present invention, the short pipe disposed in the gap between the already arranged pipe pipes has substantially the same length as the gap and is provided below the short pipe. Since the spacer is located between the fitted collars and supports the short pipe, even after the collar is fitted and the sewer pipe is joined, the inserted short pipe may go down and cause a step in the sewer pipe. Absent. That is, it is a piping method for hell piping in which the members used are lightweight, have good workability, and the steps on the inner surface of the pipeline are minimal, and are excellent in corrosion resistance.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a state of a pipeline joined by a pipe joining method of the present invention.

FIG. 2A is an explanatory view showing an example of a support having a gutter-shaped cross section. (B) It is explanatory drawing which shows an example of a rod-shaped support. (C) It is explanatory drawing which shows an example of a support body of a block shape.

FIG. 3A is an explanatory view of an example in which a support having a gutter-shaped cross section is arranged only at a lower portion of a short pipe. (B) Explanatory drawing of an example in which the support having a gutter-shaped cross section is arranged at the upper part, the side part, and the lower part of the short pipe. (C) Explanatory drawing of an example in which a rod-shaped or block-shaped support is arranged only at the lower part of the short tube. (D) Explanatory drawing of an example in which a rod-shaped or block-shaped support is disposed at the upper, side, and lower portions of the short tube.

FIG. 4 (a) is a diagram showing a state in which a collar, a water stop ring, a sand biting prevention ring, and a joint filling ring are inserted. (B) A state diagram in which a short pipe having a spacer attached to a lower portion is suspended and supported.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Short pipe 2 Collar 21 Projection 3 Spacer 41 Water stop ring 42 Sand biting prevention ring 43 Joint filling ring 5 Jack 51 Scaffolding board 52 Scaffolding support rod 53 Pulling tool (wire rope) A Piping A B Piping B

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Tsutomu Hashimoto 75 Nojiri, Ritsuto-cho, Kurita-gun, Shiga Prefecture Sekisui Chemical Co., Ltd. F-term (reference) 2D063 BA21 BA22 3H015 AA05 AC06 AE00

Claims (1)

[Claims] In a piping method for laying a pipeline by an open-cutting method, pipelines are laid facing each other from one of adjacent manholes to the other manhole, and the pipes of the respective pipelines are opened facing each other. In the gap formed between the end faces, a short pipe having the same diameter as the pipeline pipe and having a length substantially the same as the gap length is inserted, a spacer is provided at a lower portion of the short pipe, and the pipeline pipe and the collar are provided. A piping method in which a short pipe is fitted integrally.