JPH0252760B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for laying a synthetic resin buried pipe.

In this type of pipe installation method, as shown in Figure 1,
First, two shafts 1 and 2 are dug a predetermined distance apart, and a guide tunnel 3 is excavated from one shaft 1 to the other shaft 2, and then a buried pipe (huum pipe) 4 is laid. In this installation, first, the propulsion head 5 equipped with the lead pipe 5a is pushed in from the shaft 1 side entrance of the tunnel 3 using a propulsion device 6 such as a jacking device, and then one of the buried pipes 4 is connected to the propulsion head 5. After that, the propulsion head 5 uses the rear end of the buried pipe 4 to expand the diameter of the tunnel 3 and propel the buried pipe 4 forward into the tunnel 3. When the first buried pipe 4 is pushed almost into the tunnel 3, the second buried pipe 4 is cascade-connected to it using the collar 7, the rear end is pushed by the propulsion device 6, and the propulsion head 5 connects to the first buried pipe. Propel 4 further forward. In this way, the buried pipes 4, which had been pushed into the entrance of the tunnel 3 beforehand, are connected in the shaft 1 and connected to the propulsion machine 6.
Push it into tunnel 3.

Conventionally, as the collar 7, as shown in FIG. 2A, a cylindrical body made of steel plate is used, one end of which is fitted into the buried pipe 4 via a rubber ring 71 pushed into the entrance of the tunnel 3, and the other end is inserted into the buried pipe 4. Next, the buried pipes 4 to be inserted into the tunnel 3 are similarly pushed in through the rubber ring 71 to connect the buried pipes to each other.

For this reason, the resistance applied to the front end surface of the collar 7 is large, and when the front end portion is turned over, sand or the like enters between it and the buried pipe 4, resulting in an extremely large propulsion reaction force.

For this reason, it is conceivable to cut the outer peripheral surface of the abutting end of the buried pipe 4 so that it does not protrude beyond the outer peripheral surface of the collar buried pipe 4, as shown in FIG. A solid pipe is fine, but a thin walled synthetic resin pipe will have a significant drop in strength, causing damage and cannot be used.

When using this propulsion method, it is necessary to apply a large propulsion force in the axial direction of the buried pipe 4. Conventionally, a highly rigid Himumu pipe is used as the buried pipe 4, but due to its weight, it is difficult to carry out the work. In addition, if the ground is soft, it will sink, and when it sinks, it will bend at the collar 7, which may cause water leakage.

The present invention was made in order to eliminate the problems of the prior art, and includes a collar that extends closely to the rear end surface of the main body at one end of the main body, and extends from the outer circumferential surface of the collar to a part of the outer circumferential surface of the main body. By using a buried pipe with a fiber-reinforced resin layer provided with a tapered surface, the synthetic resin This makes it practical to lay buried pipes made of steel using the propulsion method, and compared to the conventional method,
The mechanical strength of the connection part, such as shear strength and bending strength, has been significantly improved, improving the workability of pipe installation work.
An object of the present invention is to provide a method for laying a buried pipe made of synthetic resin, which can provide a pipe line with almost no risk of pipe subsidence even in soft ground.

Hereinafter, one embodiment of the present invention will be described based on the drawings.

In FIG. 3, 8, 8, . . . are buried pipes made of synthetic resin, for example, hard vinyl chloride. This buried pipe 8 has a main body 81 as shown in FIG.
and a collar 82 that fits and welds to one end of the collar 82 and extends to surround the one end.
The main body 81 side end surface 82a serves as the propulsive reaction force receiving surface of No. 2.
has a tapered surface. A fiber-reinforced resin layer 83 is provided with a substantially constant thickness so as to cover a part of the outer circumferential surface of the main body 81 in the circumferential direction from the outer circumferential surface of the collar 82 through the tapered surface 82a. The fiber-reinforced resin is made of a reinforcing material such as glass fiber, metal fiber, or synthetic fiber, and a thermosetting resin such as polyester resin or epoxy resin. The reinforcing material may be long, short, mat, or woven.

To form the fiber-reinforced resin layer 83, for example, a glass roving impregnated with polyester resin may be wound by a winding method from the outer peripheral surface of the collar 82 to the outer peripheral surface of the main body 81, and then hardened. Reference numeral 9 denotes a jig made of a short synthetic resin tube, and as shown in FIG. 5, a collar-shaped handle 91 having gripping holes 91a, 91a extends a distance greater than the length L shown in FIG. 3 from both ends. It is located in a position where In addition,
The inner diameter of the collar 82 is the same as that of the buried pipe 8 inserted into it.
The outer circumferential surface of the main body 81 of the main body 81 is made to have a size that allows almost sliding contact.

Next, the pipe installation work will be explained.

The propulsion head 5 is pushed into the entrance of the tunnel 3 by the propulsion device 6, and then, as in the conventional case, the front end of the first buried pipe 8 is inserted into the connection port 51 of the propulsion head 5 to connect the two, and then the jig is 9 is inserted into the rear end of the buried pipe 8 from one end side so that the end surfaces are brought into contact with each other, and the propulsion unit 6 applies a propulsive force to the other end surface of the jig 9 to separate the propulsion head 5 and the buried pipe 8. Push into tunnel 3.
When almost the entire buried pipe 8 is submerged in the tunnel 3,
Remove the jig 9, insert the front end of the second buried pipe 8 into the collar 82 of the first buried pipe 8, connect it watertightly, and bring the end surfaces of the main bodies 81, 81 into contact with each other, and proceed in the same manner as above. After inserting the jig 9 into the second buried pipe 8, the propulsion device 6 applies a propulsive force to the buried pipe 8 via the jig 9. This driving force is generated by jigs 9 and 2.
It is transmitted sequentially to the preceding buried pipe 8 and the propulsion head 5 through the end faces of the second buried pipe 8 and the end faces of the second and first buried pipes 8, 8, and then to the propulsion head 5 and the first buried pipe. 8. The second buried pipe 8 advances inside the tunnel 3. Hereafter, in the same way, the third
The fourth, fourth, etc. buried pipes 8 are pushed into the tunnel 3.

The collar 82 of this embodiment has a tapered end face that receives the propulsive reaction force, and the collar 82 has a tapered end face that receives the thrust reaction force.
Main body 81 from the outer peripheral surface of No. 2 through the tapered surface 82a.
Since the fiber-reinforced resin layer 83 with a substantially constant thickness is provided over a part of the outer circumferential surface of the collar 82, the resistance that the collar 82 receives is small, and the pipe does not turn over when the buried pipe is pushed, allowing highly reliable pipe laying. can be done.

In addition, the collar 8 reinforced with a fiber reinforced resin layer 83
2 has the effect of restricting the front and rear buried pipes 8 to be coaxial with each other and preventing dog-legged bends from occurring, so that the mutual straightness of the buried pipes is ensured.

Further, since the jig 9 is used and the propulsion device 6 is not directly applied to the collar 82 of the buried pipe 8, there is no fear that the collar 82 will peel off.

In the embodiment described above, the collar 82 of the buried pipe 8 was molded separately from the main body 81 and integrated with the main body 81 by welding or adhesion, but as shown in FIG. A fiber reinforced resin layer 83 having a substantially constant thickness may be provided. Also, color 82 is
For convenience in color production, as shown in Figure 4 C,
Ring portion 821 slidably fitted to the main body side
and a cylindrical portion 822 that is fitted into the main body 81, and the ring portion 821 is formed with a tapered propulsive reaction force receiving pressure surface 82a to form a fiber-reinforced resin layer of approximately constant thickness as in the previous embodiment. may be provided. Furthermore, as shown in FIG. 4D, the cylindrical portion 82 is attached to the main body 81 without using the ring portion 821 in FIG. 4C.
2 may be fitted and the tapered surface 82a may be formed when the fiber reinforced resin layer 83 is provided.
The fiber reinforced resin layer 83 does not need to be provided over the entire outer peripheral surface of the collar 82.

As described above, according to the present invention, propulsion force is directly transmitted from end surface to end surface of the main body of the buried pipe, and bending is prevented by the collar whose outer peripheral surface is reinforced with a fiber-reinforced resin layer. As a result, the propulsive force acts effectively in the axial direction of the buried pipe without producing component forces, and the end face of the collar on the propulsive reaction force receiving pressure side is a tapered surface and is reinforced with a fiber-reinforced resin layer. During propulsion, the resistance that the buried pipe receives is smaller than before, so the required propulsion force is less than before, and this reduces the axial compressive force applied to the buried pipe, making it suitable for use as a buried pipe. Hard synthetic resin pipes can be used, and synthetic resin pipes are
Because it is lightweight and easy to handle, it can improve the efficiency of pipe installation work using the propulsion method compared to conventional methods, and it can also improve the reliability of pipes when laying pipes on soft ground. can.

[Brief explanation of the drawing]

Figure 1 is a side view for explaining the conventional pipe laying method, Figure 2 A and B are longitudinal sectional views of the collar in Figure 1, and Figure 3 is for explaining an embodiment of the pipe laying method according to the present invention. FIGS. 4A to 4D are half-section side views of the buried pipe used in the above embodiment, and FIG. 5 is a front view of the jig used in the above embodiment. 3... Tunnel, 5... Propulsion head, 6... Propulsion machine, 8... Buried pipe, 81... Main body, 82... Collar, 82a... Propulsion reaction force receiving end surface, 822...
Cylindrical portion, 83...Fiber-reinforced resin layer.

Claims (1)

[Claims] 1. In a pipe installation method using the propulsion method, in which buried pipes are successively connected and pushed into a guide tunnel excavated underground, the buried pipe is a synthetic resin pipe, and the rear end of the main body is fitted with a collar that extends closely. A fiber-reinforced resin layer is provided so as to have a tapered surface from the outer peripheral surface of the collar to a part of the outer peripheral surface of the main body, and a fiber-reinforced resin layer is provided so as to have a tapered surface from the outer peripheral surface of the collar to a part of the outer peripheral surface of the main body. A pipe installation method characterized by propelling a buried pipe while also using a propulsion force.