JPH08158789A - Sewage pipe line - Google Patents

Abstract

PURPOSE: To connect driving pipes without using a welding method and to realize a sewage pipe line without being damaged by a ground flow such as earthquakes etc. CONSTITUTION: In a sewage pipe line formed by locating a sewage main pipe 1 with a diameter smaller than that of a driving pipe to the inside of a plurality of driving pipes subsequently connected in the direction of the pipe axis while inserting a joint ring 4 having a cylinder section with a diameter smaller than the inside diameter thereof in the pipe end of the cylindrical driving pipe 2, a flange is formed around the longitudinal center of the cylinder section 41 of the joint ring 4. A cable 7 is provided along the interior wall of the driving pipe, and both ends thereof are fixed to a fixed ring 5 provided to the outside of the joint ring 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sewer pipe laid in soil by a propulsion method, and more particularly to a seismic seismic pipe line capable of coping with ground changes such as liquefaction due to an earthquake.

[0002]

2. Description of the Related Art As a rule, sewer pipelines are designed by gravity flow with a water surface gradient, so depending on the terrain, there may be a large amount of soil cover, or when crossing roads or the lower part of railways where traffic is frequent. Since it is often difficult to excavate, laying by the propulsion method is often performed. Examples of materials for the pipeline in the propulsion method include steel pipes, cast iron pipes including ductile cast iron pipes, and concrete pipes.

Since Japan is an earthquake-prone country, seismic resistance study is indispensable no matter which pipeline material is laid, and after confirming the seismic performance of the pipeline according to the seismic design formula based on the response displacement method, Is being constructed. In this way, despite the earthquake-resistant design, according to the recent damage situation of buried pipes during earthquakes, there are many cases of destruction due to slipping out or breakage of pipeline joints around the liquefied ground. It has been reported.

[0004] Since the pipeline by the existing propulsion method is laid by pressing the pipeline itself with a jack, there is no gap in the pipeline axial direction in principle, and it is horizontal to the pipeline due to ground flow during an earthquake. There is a problem in that when a directional force is applied, it breaks, and when a tensile force is applied, it breaks out from the joint. Further, when a steel pipe is used as a pipeline, it is disclosed in
As described in 63-251692, it is usual to weld and join steel pipes for each propulsion unit. The welded pipe can be constructed so that it can withstand earthquakes in terms of strength, but it requires long welding work for each joint.
In addition to the longer construction period, corrosion-resistant coating cannot be applied in advance to the welded part, so internal coating had to be done after connection, which was a problem depending on the pipe diameter. .

Japanese Unexamined Patent Publication (Kokai) No. 3-39594 discloses a joint structure and a pipe propulsion method in which these problems are solved and welding is not performed. This will be described with reference to FIGS. Figure 6 is a partial cross-sectional view of the vicinity of the pipe joint in this pipe propulsion method,
FIG. 7 is a front view of the spacer 55 seen from the pipe length direction, FIG. 8 is a side view, 51 is a receiving part of a pipe joint, 52 is an insertion part, 53 is a lock ring fitted in the insertion part, 54 Is a stepped portion at the tip of the insertion opening, 55 is a spacer, 56 is the ring body of the spacer, 57
Is a diameter expansion jack of the spacer, 58 is also an extension jack,
Reference numeral 59 is an exterior concrete for making the outer shape of the pipe cylindrical, including the joint portion.

The spacer 55 has a ring body 56 divided into two parts.
A diametrical expansion jack 57 that is provided in the two split parts and expands and contracts in the radial direction, that is, in the vertical direction in FIGS.
And an extension jack 58 provided on the surface of the ring body 56 in the tube axis direction. In this pipe propulsion method, insert the spacer 55 between the receiving portion 51 and the insertion portion 52 of the pipe joint,
The expansion jack 57 and the extension jack 58 are both extended and propelled. As shown in FIG. 7, the outer circumference of the ring body 56 divided into two is a perfect circle in a state where the expanded diameter jack 57 is extended, and its diameter is substantially equal to the inner diameter of the receiving portion 51 of the pipe joint. After the end of the propulsion, the spacer 55 can be taken out by making all the jacks contracted, and the socket 51
A gap corresponding to the total thickness B of the spacer 55 when the extension jack 58 is extended is left between the insertion hole 52 and the insertion opening 52. Therefore, when the pipeline after installation receives an external force in the pipe axis direction due to ground displacement such as an earthquake and a compressive force in the pipe axis direction, the gap B functions as a shrinkage allowance at the joint portion, and until it becomes zero. Can be displaced without damage.

On the other hand, the lock ring fitted in the insertion opening 52
53 is fitted in a groove provided on the inner surface of the receiving portion 51,
Since a stepped portion 54 having a slightly larger diameter is formed at the tip of the insertion portion 52, when a compressive force is applied in the pipe axial direction, the distance A between the lock ring 53 and the stepped portion 54 serves as an extension margin. It works and can be displaced without damage until it reaches zero.

[0008]

By the way, this pipe propulsion method is certainly effective if only the joint portion is considered, but the spacers 55 inserted at several places in the entire construction section of the pipeline are Since it cannot be removed until the propulsion is completed for the entire length of the construction section, not only do many spacers and jacks and hydraulic pipes that connect to them become complicated in the pipeline, but also it is complicated to remove them all at once. Yes, it is extremely difficult when the inner diameter of the conduit is small.

Further, when the displacement in the earthquake is in the direction perpendicular to the pipe axis, this joint structure cannot cope with the bending of the pipe, and there is a problem in that it cannot avoid damage. An object of the present invention is to realize a seismic seismic resistant pipeline that solves these problems.

[0010]

SUMMARY OF THE INVENTION According to the present invention, a plurality of pipes are sequentially connected in the pipe axial direction while inserting a seam ring having a cylindrical portion having a diameter slightly smaller than the inner diameter of the pipe end portion of a cylindrical propulsion pipe. In the sewer pipe line in which a main pipe for sewerage with a diameter smaller than this is arranged inside the propulsion pipe of, the radial projection is formed near the center in the length direction of the cylindrical portion of the seam ring, and the connection is made. A cable is arranged along the inner wall of the plural propulsion pipes in the pipe axial direction, and both ends of the cable are inserted into the propulsion pipe in contact with the outside of the seam ring at a position corresponding to the cable length. It is a sewer pipe characterized by being fixed to a fixing ring, and more preferably, a supporting ring having a U-shaped notch radially provided on the outer peripheral portion is provided in the propulsion pipe in the middle of the fixing ring fixing both ends of the cable. set on Is the sewage conduit of comprising Te. Further, it is preferable that the radial projections formed in the vicinity of the center in the lengthwise direction of the cylindrical portion of the seam ring are flanges or a plurality of rod-shaped bodies radially arranged at equal intervals.

[0011]

[Operation] According to the present invention, the propulsion pipe, which is a protection pipe that protects the main pipe outside the main pipe, is separated from the cylindrical portion of the seam ring even if the propulsion pipe is slightly separated in the pipe axial direction due to an earthquake or the like. Unless the seam is open, the cable placed on the inner surface can prevent the pipe from dropping. Also,
Since there is a slight gap between the seam ring and the inner diameter of the propulsion pipe, and the rubber ring is inserted in this pipe, it is possible to allow the shaft core to be misaligned and bent within the elastic deformation range of the rubber.

[0012]

An embodiment of the present invention will be described with reference to the drawings. 1 and 2 are cross-sectional views showing a part of the pipeline of this embodiment.
Is a main pipe, 2 is a propulsion pipe, 3 is a coating film applied to the outer surface of the propulsion pipe 2, 4 is a joint ring, 5 is a fixing ring for a cable, 6 is a supporting ring for a cable, 7 is a cable, 8 Is a nut and 9 is a rubber ring.

This pipe line has a double pipe structure in which a main pipe 1 for passing sewage is housed inside a propelling pipe 2 which is a steel pipe. The propulsion pipe 2 performs propulsion during laying, and also functions as a protective pipe that protects the main pipe 1 after laying. A coating film 3 is formed on the surface of the propulsion tube 2 in order to reduce frictional resistance during propulsion. Depending on the stroke of the jack for propulsion, for example, 1
Book length is 2.5m.

The main pipe 1 can be made of any material such as polyethylene pipe, vinyl chloride pipe, and ceramic pipe, which has a high corrosion resistance for sewerage but cannot be used for propulsion due to its strength. The sheath joint structure is also optional. The pipe line of the present invention is sequentially connected in the pipe axial direction while inserting the seam ring 4 into the pipe end portion of the propulsion pipe 2, and along the inner walls of the plurality of connected propulsion pipes 2, for example, 50
A plurality of cables 7 each having a length of about m are arranged, and both ends thereof are fixed to a fixing ring 5 which is inserted into the propulsion pipe so as to be in contact with the outside of the seam ring 4 at a position corresponding to the cable length. Consists of

FIG. 3 is a perspective view showing the seam ring 4.
In the structure shown in (a), a flange 42 protruding in the radial direction is formed in the center of a cylindrical portion 41 slightly smaller than the inner diameter of the propulsion pipe 2. In addition, as shown in (b), instead of the flange 42, a plurality of rod-shaped bodies 43 arranged radially at equal intervals.
Are mounted radially at equal intervals. Both the flange 42 and the rod-shaped body 43 serve to evenly transmit the propulsive force over the entire cross section of the propulsion pipe 2 and to position the cylindrical portion 41 inside the joint of the propulsion pipe 2.

As shown in FIGS. 1 and 2, a rubber ring 9 for stopping water is inserted into a slight gap between the propulsion pipe 2 and the cylindrical portion 41. Therefore, it is desirable that both end portions of the cylindrical portion 41 have a shape that is slightly open to the outside so that the rubber ring 9 does not fall off. Thus, the outer diameter of the cylindrical portion 41 of the seam ring 4 inserted at each seam of the propulsion pipe 2 is made slightly smaller than the inner diameter of the propulsion pipe 2, and the rubber ring 9 is provided in the gap.
Even if the adjacent propulsion pipes 2 are separated from each other in the pipe axial direction by inserting, the joints of the propulsion pipes 2 do not open unless the propulsion pipes 2 are disengaged from the cylindrical portion 41 of the joint ring 4, and Aqueous is maintained. In addition, the adjacent propulsion pipe 2
However, the elastic deformation of the rubber ring 9 allows the shaft cores to be slightly misaligned with each other or to be bent, and the waterproofness can be maintained. Therefore, the length L of the cylindrical portion 41
Depends on the expected displacement of the ground where the pipeline is laid,
It should be about 30 cm.

Further, when the displacement in the axial direction exceeds this, the pipe 7 does not come out and fall off, so that the cable 7 is arranged on the inner surface of the propulsion pipe. That is, as shown in FIG. 1, a fixing ring 5 for a cable is inserted outside the seam ring 4 at a position corresponding to the cable length.
The fixing ring 5 is a doughnut-shaped steel plate having a plurality of holes in the circumferential direction as shown in FIG. 4, and the outer diameter corresponds to the inner diameter of the propulsion pipe 2 and the inner diameter corresponds to the outer diameter of the main pipe 1. are doing.
In this embodiment, four cables 7 are provided at equal intervals of 90 degrees, so that the fixing ring 5 is provided with eight holes at substantially equal intervals and four cables are stretched to the left and right with respect to the seam ring 4. The cable 7 is inserted into the two fixing rings 5, and the ends are fixed with nuts 8.

The cable 7 is a stranded wire rope, which is in a tension-free state with a free length in the laid condition of the pipeline, and does not break until it exceeds the extension deformation limit amount S set by the designer. The length is, for example, 50 m. Assuming that there are n seam rings of the propulsion pipes per the entire length of the cable, S ≧ n · L.

The fixing rings 5 are provided approximately every 50 m, but in order to prevent the cables 7 from sagging and contacting each other in the middle, the supporting rings 6 are inserted at appropriate intervals. As shown in FIG. 5, the support ring 6 is a doughnut-shaped plate material such as vinyl chloride in which U-shaped notches through which the cables 7 can pass are provided at equal intervals on the outer peripheral portion. 7 is free to pass and in particular no axial forces act on the support ring 6 so that it does not necessarily have to be placed in contact with the seam ring 4 and may be at any position in the tube, as shown in FIG. The fixing ring 5 and the support ring 6 both support the main pipe of the sewer at the inner diameter portion.

It should be noted that, instead of the seam ring 4, the fixing rings 5 may be attached to the wall surface of the manhole, for example, at both ends of the duct for propelling.

[0021]

According to the present invention, since the joint is a plug-in type and welding is not performed, the working time is shortened, and since the main pipe is separated from the propulsion pipe, a pipe material of any material suitable for sewer can be used. Not only can it be performed, but it also has an excellent effect that the pipeline is not broken or dropped by following the horizontal displacement due to the lateral flow of the ground.

[Brief description of drawings]

FIG. 1 is a sectional view showing a part of a pipeline according to an embodiment of the present invention.

FIG. 2 is a sectional view showing another part of the conduit according to the embodiment of the present invention.

FIG. 3 is a perspective view showing a seam ring in the embodiment of the present invention.

FIG. 4 is a side view showing a fixing ring according to an embodiment of the present invention.

FIG. 5 is a side view showing a support ring according to an embodiment of the present invention.

FIG. 6 is a partial cross-sectional view of the vicinity of a pipe joint according to a conventional technique.

FIG. 7 is a front view of a spacer according to a conventional technique.

FIG. 8 is a side view of a spacer in the related art.

[Explanation of symbols]

 1 Main pipe 2 Propulsion pipe 3 Coating film 4 Seam ring 5 Fixing ring 6 Support ring 7 Cable 8 Nut 9 Rubber ring 41 Cylindrical part 42 Flange 43 Rod-like body 51 Receptacle part 52 Insert part 53 Lock ring 54 Step part 55 Spacer 56 Ring body 57 Expansion jack 58 Extension jack 59 Exterior concrete

Claims (4)

[Claims] 1. A plurality of pipes are sequentially connected in the pipe axial direction while inserting a seam ring (4) having a cylindrical portion (41) having a diameter slightly smaller than the inner diameter of the pipe end portion of the cylindrical propulsion pipe (2). In a sewer pipe in which a main pipe (1) for sewerage having a smaller diameter than that is arranged inside a propulsion pipe of a book, a radial projection is made in the vicinity of the longitudinal center of the cylindrical portion of the seam ring (4). Forming a part, and arranging the cable (7) along the inner wall of the plurality of connected propulsion pipes (2) in the pipe axial direction, and connecting both ends of the cable to a seam ring at a position corresponding to the cable length. A sewer line characterized by being fixed to a fixing ring (5) inserted into the propulsion pipe in contact with the outside of (4). 2. A support ring (6) having a U-shaped notch radially provided on the outer periphery thereof is disposed in the propulsion pipe in the middle of the fixing ring (5) fixing both ends of the cable. Sewer pipeline. 3. The sewer pipeline according to claim 1, wherein the radial projection formed in the vicinity of the longitudinal center of the cylindrical portion (41) of the seam ring (4) is a flange (42). 4. The radial projections formed in the vicinity of the longitudinal center of the cylindrical portion (41) of the seam ring (4) are a plurality of rod-shaped bodies (43) radially arranged at equal intervals. The sewer pipeline according to Item 1 or 2.