JPH06257396A - Preventing method for injury of inner circumferential face of main tube in propulsive construction method for double tube - Google Patents

Abstract

PURPOSE:To prevent the inner circumferential face of a main tube from being injured by means of mud feed and drain tubes going in and out in the main tube, when the main tube of a direct push propulsive double steel tube is propelled in the earth. CONSTITUTION:When a direct push propulsive double steel tube 5 is propelled with a prime pusher jack 8 and mud feed and drain tubes 10, 11 are taken in and out against the main tube 7 of the double steel tube 5, a holding member 13 consisting of a tube receiving base 13a and an elastic wheel 13b is fitted to the mud feed and drain tubes 10, 11. While running the holding member 13 in the main tube 7, the mud feed and drain tubes 10, 11 are taken in and out of the main tube 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a resin preliminarily applied to a main pipe by a mud pipe or a mud pipe (hereinafter simply referred to as a mud pipe) which is put into and taken out of the main pipe during construction of the double pipe propulsion method. The present invention relates to a method for preventing damage to the inner peripheral surface of a main pipe, which can prevent the coating film from being damaged.

[0002]

2. Description of the Related Art Conventionally, in carrying out a shield propulsion method, as shown in, for example, JP-A-60-246994 or JP-A-63-5095, the shield body propels the ground. A mud pipe for supplying mud water and a mud pipe for discharging mud water mixed with excavated earth and sand are attached to the rear part of the shield body, and a plurality of pipes are connected to the shield body. These mud pipes and mud pipes were also inserted inside the individual concrete pipes, plastic pipes, steel pipes, and other propulsion pipes.

[0003]

However, since such a mud pipe and a mud pipe (a mud pipe) have a structure for supplying and discharging mud, the mud pipe is relatively heavy. When the sludge feed pipe was slid on the inner surface of the propulsion pipe to move it in and out of the propulsion pipe, there was a problem of damaging the inner surface of the propulsion pipe. In concrete pipes and plastic pipes used for water and sewage, the damage caused by sliding of the mud pipe is not a problem, but when the inner surface of the steel pipe that feeds gas is damaged. For many years, there was a risk of corrosion from this damaged area, resulting in a major accident.

Therefore, a resin coating has been applied to the inner peripheral surface of a steel pipe for feeding a gas recently in order to protect the inner peripheral surface of the steel pipe. Is
There is a problem that the resin coating film is damaged and partially peeled off due to the sliding friction of the mud discharge pipe in order to take the mud discharge pipe in and out of the steel pipe.

The method for preventing damage to the inner peripheral surface of the main pipe in the double pipe propulsion method according to the present invention is a technique which has fundamentally improved the above problems, and in particular, the double propulsion method is used. A completely new technology that can prevent damage to the inner peripheral surface of the inner main pipe of the steel pipe double pipe for gas supply to be propelled by the sliding of the mud pipe that is taken in and out of this main pipe. It is provided.

[0006]

The method for preventing damage to the inner peripheral surface of the main pipe in the double pipe propulsion method according to the present invention is a technique which fundamentally improves the above-mentioned conventional problems. The gist is to apply thrust to the shield body while sequentially connecting a plurality of main pipes of direct-acting propelling double steel pipes to the rear end of the shield body, and to propel the shield body and the main pipe into the ground. In the double pipe propulsion method, a holding member capable of running the mud pipe and the mud pipe in the main pipe with less friction is provided at a predetermined position of the mud pipe or the mud pipe inserted into the main pipe. The mud-sending pipe and the mud-drain pipe are taken in and out of the main pipe while the holding member is mounted on the inner peripheral face of the main pipe and smoothly run, thereby preventing damage to the inner peripheral face of the main pipe.

[0007]

As described above, the method of preventing damage to the inner peripheral surface of the main pipe in the double pipe propulsion method according to the present invention reduces friction in the main pipe when the sludge discharge pipe is taken in and out of the main pipe. Since a holding member that can be moved by being attached is attached to the mud sending and discharging pipe, the mud sending and discharging pipe can be smoothly moved in and out of the main pipe through this holding member and the inner circumference of the main pipe It is possible to prevent the surface from being damaged by taking in and out the mud pipe.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a method for preventing damage to the inner peripheral surface of a main pipe in a double pipe propulsion method according to the present invention will be described in detail with reference to the drawings. FIG. Cross-sectional explanatory view during the execution of the shield propulsion method, Fig. 1 (B)
1A is a cross-sectional view taken along the line AA in FIG. 1A, and FIG. 2 is a cross-sectional explanatory view showing a state in which the mud transmission pipe is recovered after the shield propulsion method in FIG. 1 is completed.

In FIGS. 1 and 2, reference numeral 1 is a propulsion ground, a starting shaft 2 is excavated at the base of the propulsion ground, and a reaching shaft 3 is excavated at the tip side thereof. A shield body 4 is propelled while excavating the propulsion ground 1. A plurality of direct-pressing double steel pipes 5 are continuously arranged in parallel on the shield body 4.

This direct-pressing double steel pipe 5 has an outer outer pipe 6
And a main pipe 7 on the inner side, and is directly pushed by a former push jack 8 installed in the starting vertical shaft 2 for propelling. Reference numeral 9 is a push ring provided at the tip of the original push jack 8. Reference numeral 10 is a mud pipe, 11 is a mud pipe (hereinafter simply referred to as mud pipes 10 and 11), and a plurality of pipes are connected in sequence through a connection pipe 12. These mud pipes 10 and 11 are inserted into the main pipe 7, and the tips thereof are inserted and fixed in the shield body 4.

Reference numeral 13 is a holding member for the sludge feeding pipes 10 and 11, and a pipe cradle 13a for supporting the sludge feeding pipes 10 and 11.
And a rubber elastic wheel 13b rotatably attached to the tube support 13a. A synthetic resin coating (not shown) is applied to the inner peripheral surface of the main pipe 7 of the direct-pushing propelling double steel pipe 5 in order to protect the inner peripheral surface.

In the above embodiment, as shown in FIG. 1 (B) in particular, the two parallel mud pipes 10 and 11 are supported together by the pipe receiving base 13a of the holding member 13. Although configured, the mud pipes 10 and 11 are provided with separate holding members 13 respectively.
It is also possible to support with. By attaching the binding 14 to the holding member 13 in advance, the holding member 1 can be used by using the binding 14.
3 can be easily attached and fixed to any place of the mud pipes 10 and 11.

In carrying out the method for preventing damage to the inner peripheral surface of the main pipe in the double pipe propulsion method according to the present invention, holding members 13 are attached to the predetermined positions of the mud pipes 10 and 11 at regular intervals, While rotating the elastic wheels 13b of the holding member 13 along the inner peripheral surface of the main pipe 7, these mud pipes 10,
By putting 11 in and out of the main pipe 7, the sending and discharging mud pipes 10 and 11 can be extremely light and smooth, and by putting in and taking out these mud pipes 10 and 11, the inner circumference of the main pipe 7 can be improved. It is possible to completely prevent the surface from being damaged.

[0014]

As described above, the method of preventing damage to the inner peripheral surface of the main pipe in the double pipe propulsion method according to the present invention is a holding member capable of running smoothly along the inner peripheral surface of the main pipe. Since the pipes are attached to the mud pipe at a predetermined interval, the mud pipe can be taken in and out of the main pipe with a light force by the action of this holding member. In addition, since the holding member is provided with elastic wheels and the like, the resin layer on the inner surface of the main pipe is not damaged even when running, and therefore the main pipe corrodes over a long period of time to prevent gas leakage. It has features such as no danger of occurring.

[Brief description of drawings]

FIG. 1 (A) is a cross-sectional explanatory view during the execution of a shield propulsion method using the method of the present invention.

1B is a cross-sectional view taken along the line AA of FIG.

FIG. 2 is a cross-sectional explanatory view showing a state in which the mud pipes are collected after the shield propulsion method of FIG. 1 is completed.

[Explanation of symbols]

1 propulsion ground 2 start vertical shaft 3 reaching vertical shaft 4 shield main body 5 direct thrust double steel pipe 6 outer pipe 7 main pipe 8 former push jack 9 push ring 10 mud pipe 11 drainage pipe 12 connection pipe 13 holding member 13a Pipe cradle 13b Elastic wheels 14 Binding

[Procedure amendment]

[Submission date] January 17, 1994

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be corrected] Brief description of the drawing

[Correction method] Change

[Correction content]

[Brief description of drawings]

1 (A) is a cross-sectional explanatory view in the middle of carrying out a shield propulsion method using the method of the present invention, and FIG. 1 (B) is a cross-sectional view taken along the line AA of FIG. 1 (A). .

FIG. 2 is a cross-sectional explanatory view of a state in which the mud pipe is collected after the shield propulsion method of FIG. 1 is completed.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Makoto Niiyama 5-14-10-310 Sagamigaoka, Zama City, Kanagawa Prefecture (72) Inventor Hideki Uno 1118-22 Wakamatsucho, Tokorozawa City, Saitama Prefecture

Claims (1)

[Claims] 1. A main body of a plurality of direct-pushing double steel pipes is sequentially connected to the rear end of the shield main body, and a thrust force is applied to the shield main body so that the shield main body and the main pipe are in the ground. In a double pipe propulsion method for propelling the pipe, the mud pipe and the mud pipe are held at a predetermined position of the mud pipe or the mud pipe inserted in the main pipe so that the mud pipe and the mud pipe can travel in the main pipe with little friction Attach the parts,
A double pipe characterized by preventing the inner peripheral surface of the main pipe from being scratched by moving the holding member in and out of the main pipe while smoothly running the inner peripheral surface of the main pipe. A method for preventing damage to the inner peripheral surface of the main pipe in the propulsion method.