JPH1162473A - Hume pipe for jacking method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve productive efficiency and reduce manufacturing cost by forming a steel plate consisting of a spigot cover with outward protrusions, a stepped part cover part and an outer peripheral surface cover, into cylindrical shape to form a spigot side steel ring. SOLUTION: An inclined stepped part 25 is formed at the tip part of the outer peripheral surface of a Hume pipe body 21. A spigot side steel ring 22 is composed of a spigot cover part 27 with three protrusions 31a-31c, a level difference cover part 28 and an outer peripheral surface cover part 29. A Hume pipe is formed in annular shape by forming a steel plate in cylindrical shape and welding both edges. The spigot side steel ring 22 and a socket side steel collar 23 are integrated with the Hume pipe body 21 at the time of centrifugal molding in a cylindrical form during the manufacture of the Hume pipe. The spigot side of the Hume pipe is pressed into a socket 33 of the Hume pipe, with a packing inserted. The spigot side steel ring 22 is formed of a steel plate formed in cylindrical shape so as to improve productive efficiency.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fume pipe for a propulsion method, and more particularly to a fume pipe having a reinforcing structure using steel members.

[0002]

2. Description of the Related Art As a measure for improving the strength of a fume pipe for a propulsion method, a steel member is mounted on an outer peripheral surface of a reinforced concrete fume pipe body not only on a receiving side but also on an inlet side. In some cases, the entire outer peripheral surface of the fume tube main body is covered with a steel member.

FIG. 3 shows an example of a conventional fume tube in which such reinforcement measures are taken. In this case, the outlet-side steel ring 1 attached to the outlet side includes an outer peripheral surface cover portion 5 covering the outer peripheral surface 4 continuous with the step portion 3 of the fume tube main body 2, a step portion cover portion 6, an outlet portion. The cover 7 and the end face cover 9 are individually manufactured, and these are integrated by welding. Further, two ribs 8 which are separate members in the circumferential direction are welded to the outer peripheral surface of the outlet cover portion 7.

[0004] At the other end of the fume tube main body 2, a receiving-side steel collar 10 is mounted, and a portion protruding rearward from the end surface serves as a receiving port 11. Note that the end face cover 9 that covers the end face of the insertion opening may be omitted.

[0005]

In the conventional fume tube as described above, the steel ring 1 on the inlet side is manufactured by integrating individual parts by welding, so that the production efficiency is low and the welding can withstand welding. There is a problem that the wall thickness is required and the cost is increased as a whole. Further, when welding each part over the entire circumference of the fume tube, it is difficult to weld over the entire circumference because of the influence of thermal distortion during welding, and there are some cases where parts cannot be welded. Furthermore,
Since the ribs 8 are square, the packing is
There was also a drawback that it was easy to be cut at the corners.

[0006] Therefore, an object of the present invention is to provide a fume pipe for a propulsion method which has solved these problems.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention forms a step portion having a smaller diameter than the outer peripheral surface at a tip portion of the outer peripheral surface of the fume tube main body at a required inclination angle. An outlet is formed between the step portion and the tip, and an outlet-side steel ring is attached to a range extending from the tip of the outlet to the outer peripheral surface of the fume tube body beyond the step portion and the fume tube body. In a fume pipe for a propulsion method, a receiving-side steel collar is attached to a rear end portion of an outer peripheral surface of the outer peripheral surface, and a rear end portion of the receiving-side steel collar is protruded rearward to form a receiving port. A ring made of a single steel plate including an inlet cover, a step cover, and a step cover and an outer peripheral surface cover that cover each part of the outlet, the step, and the outer peripheral surface of the fume tube main body. Circumferential direction on cover It is obtained by a structure in which molded at a required interval at least three outward protrusions.

[0008] It is possible to adopt a configuration in which the outer peripheral surface cover of the inlet-side steel ring and the receiving-side steel collar are integrated.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of the present invention will be described with reference to FIG.
A description will be given based on FIG. As shown in FIG. 1A, the fume pipe of the embodiment includes a fume pipe main body 21 made of reinforced concrete, an inlet-side steel ring 22, and a receiving-side steel collar 23. The fume tube main body 21
An inclined step 25 is formed at the tip of the outer peripheral surface 24, and a space between the step 25 and the tip forms an inlet 26.

The inlet-side steel ring 22 includes an inlet cover 27 for covering the above-mentioned inlet 26, a step cover 28 continuous with the inlet cover 27, and an outer peripheral surface cover continuous with the step cover 28. 29, and three circumferential ridges 31a, 31b, 3
1c are formed at required intervals. Each of these ridges 31a, 31b, 31c is formed so as to form a waveform in which the inner surface is recessed and protrudes to the outer surface. A ridge 31b is formed with the peripheral groove 32b, the ridge 31c,
The circumferential groove 32c and the step cover 28 are arranged in this order.

The inlet cover 27, the step cover 28, and the outer peripheral surface cover 29 are formed in a ring shape by forming a single steel plate into a cylindrical shape and joining both end edges thereof by welding. Is done.

The receiving-side steel collar 23 is formed in a cylindrical shape as in a normal case, and a portion protruding rearward from the rear end of the fume tube main body 21 becomes a receiving port 33.

The above-mentioned inlet-side steel ring 22 and receiving-side steel collar 23 are mounted in a cylindrical form when manufacturing the fume tube, and are integrated with the fume tube main body 21 during centrifugal molding.

FIG. 2 shows a receiving port 3 of one fume tube 21.
FIG. 3 shows a joint structure in which the insertion side of the other fume tube 21 is inserted.

In the above insertion, the circumferential grooves 32a, 32b,
Packings 34, 35, 36 are attached to 32c, respectively. These packings 34, 35, and 36 perform functions such as guiding at the time of connection, stopping water, preventing intrusion of earth and sand, and the like. A required distance L is provided between the end of the receiving port 33 and the shoulder 37 of the step cover 28 in order to avoid interference at the curve of the tunnel. A cushion material 38 is interposed between the inner end surface of the receiving port 33 and the front end surface of the insertion port 26.

In addition, a so-called synthetic pipe is formed by integrating the outer peripheral surface cover portion 29 of the inlet-side steel ring 22 and the receiving-side steel collar 23 so as to cover the fume tube main body 21 and the entire outer peripheral surface. (See the dashed line in FIG. 1A).

As means for integration in this case, FIG.
As shown in (b), the fitting portion 3 having a small diameter by the thickness of the steel plate is attached to the end of the outer peripheral surface cover portion 29 of the inlet-side steel ring 22.
9 is provided, and the end of the steel collar 23 on the receiving side is fitted to the fitting portion 39 and welded. FIG. 1 (c)
As shown in the figure, a steel reinforcing ring 41 is fitted between the inlet-side steel ring 22 and the receiving-side steel collar 23, and both ends of the reinforcing ring 41 are connected to the inlet-side steel ring 22 and the receiving-side steel ring. You may make it fit to the fitting part 39 of the collar 23 and weld it.

In the case of the synthetic pipe, the inner peripheral surface of the end of the inlet cover 27 of the inlet-side steel ring 22 and the inner peripheral surface of the end of the receiving port 33 of the receiving-side steel collar 23 are formed. , End face cover members 42 and 43 each being a separate member
(See the dashed line in FIG. 1).

[0019]

As described above, the fume tube for a propulsion method according to the present invention comprises a single steel plate formed by connecting a steel ring at the inlet side comprising an inlet cover portion, a step portion cover portion and an outer peripheral surface cover portion. Since it is manufactured by molding into a shape, the production efficiency is remarkably improved as compared with the related art. In addition, since there is a sufficient reinforcing effect due to the presence of the outwardly projecting ridge of the outlet cover portion and the outer peripheral surface cover portion, it is possible to use a thinner steel plate than in the past, and together with the improvement in production efficiency, the production cost of the fume tube is reduced. Can be reduced.

The shoulder portion of the step is a portion that is easily damaged by colliding with earth and sand or rocks at the curved portion of the tunnel, but this portion is protected by the step cover and the outer peripheral surface cover connected to the step. Therefore, it is possible to prevent the fume tube main body from being damaged. Furthermore, there is no problem associated with welding as in the prior art, and since each ridge is rounded, there is no danger of cutting the packing.

According to the second aspect of the present invention, it is possible to provide a fume pipe for a propulsion method having further increased rigidity.

[Brief description of the drawings]

1A is a cross-sectional view of an embodiment; FIG. 1B is a partial cross-sectional view of a modification of the embodiment;

FIG. 2 is a partially enlarged sectional view of the usage form of the above.

FIG. 3 is a partially omitted sectional view of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 21 Fume pipe main body 22 Inlet side steel ring 23 Receptor side steel collar 24 Outer peripheral surface 25 Step 26 Inlet 27 Inlet cover 28 Step cover 29 Outer surface cover 31a, 31b, 31c Ridge 32a, 32b, 32c Peripheral groove 33 Receptacle port 34, 35, 36 Packing 37 Shoulder 38 Cushion material 39 Fitting part 41 Steel reinforcing ring 42, 43 End face cover member

Claims (2)

[Claims] 1. A step portion having a smaller diameter than the outer peripheral surface is formed at a leading end portion of the outer peripheral surface of the fume tube main body at a required inclination angle, and an outlet is formed between the step portion and the distal end. Attach the inlet-side steel ring to the area extending from the tip of the mouth to the outer peripheral surface of the fume tube body beyond the step, and attach the receiving-side steel collar to the rear end of the outer peripheral surface of the fume tube body. A propulsion method fume pipe having a rear end portion formed by projecting a rear end portion of a receiving-side steel collar rearward, wherein the inlet-side steel ring is connected to the outlet, the step portion, and the outer peripheral surface of the fume tube main body. Is formed of a single steel plate including an opening cover portion, a stepped portion cover portion, and an outer peripheral surface cover portion which cover each portion of the above, and at least three circumferentially outwardly projecting ridge portions are formed on the insertion cover portion. Forming at required intervals A fume tube for a propulsion method characterized by the following. 2. The fume tube for a propulsion method according to claim 1, wherein an outer peripheral surface cover portion of the inlet-side steel ring and the receiving-side steel collar are integrated.