JP2003239680A - Method for connecting shield new pipe to existing pipe under ground - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for connecting a shielded new pipe to an existing pipe under the ground. <P>SOLUTION: According to the method, the ground on the periphery of a joint portion is subjected to soil improvement, and when a leading end of a shield machine arrives at the joint portion, equipment items (inclusive of earth retaining equipment such as a face plate) in the shield machine are all removed. Thereafter, a lining body 5 of a cutting edge structure is formed in the leading end of a remaining shield shell 1 according to specifications of segment formation, and then the leading end is abutted on the existing pipe 3 and connected to the same by propelling a propeller jack 6 having the lining body set in its rear portion. Before the connecting work is started, it is preferable that preparations for a pneumatic method are made in order that the pneumatic method is readily available as needed. The present method has an advantage of being applicable to the new pipe 2 even if it has a curved portion with a small radius of curvature. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of underground joining a new pipe for shield construction to an existing pipe.

[0002]

2. Description of the Related Art Conventionally, as a technique for underground joining a new pipe for shield construction to an existing pipe, when the tip of the shield reaches the joining position with the existing pipe, a slide that is pre-installed on the outside of the tip of the shield machine A so-called slide hood construction method is known in which the hood is pushed out with a jack and joined to the existing pipe, but this conventional construction method has the advantage that the face is not opened during the joining work, but the shield machine used is a special product. Therefore, the manufacturing cost thereof is high, and the shield machine is long due to the equipment of the slide hood. Therefore, there is a disadvantage that it cannot be applied when the new pipe includes a curved portion having a small radius of curvature.

[0003]

The problem to be solved by the present invention (object of the present invention) can be applied to a case where the above-mentioned slide hood construction method cannot be applied and the new pipe includes a curved portion having a small radius of curvature. It is to provide a method of connecting a new pipe for shield construction and an existing pipe underground.

[0004]

In order to solve the above-mentioned problems, in the underground joining method for a shielded new pipe and an existing pipe of the present invention (hereinafter referred to as the method of the present invention), a new shielded pipe is used. Before joining the underground pipe to the existing pipe, the ground around the joint should be improved in advance by an appropriate construction method, and at the stage where the tip of the shield machine reached the joint point, all the equipment inside the shield machine was removed and left. A lining body with a blade structure that connects the shield outer shell and the existing pipe is formed in the tip portion of the shield outer shell with segment specifications, and this lining body is propelled by a propulsion jack installed behind it, and The tip is brought into contact with the existing pipe and joined.

In the method of the present invention, it is preferable to prepare the pneumatic construction method before the start of the joining work so that it can be applied as needed during the joining work.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1, which is an explanatory view of an embodiment of a construction method of the present invention, 1 is a shield outer shell, 2 is a new pipe connected to the rear of the shield outer shell 1, and 3 is a new pipe 2 joined. The existing pipes 4 to be provided are ground improvement portions around the joints, and the ground improvement portions 4 are constructed before the start of the joint work, but how to perform this is arbitrary. Alternatively, the chemical solution injection method may be performed from step 3.

The operation of joining the new pipe 2 and the existing pipe 3 is started when the tip of the shield machine for constructing the new pipe 2 (the tip of the shield outer shell 1) reaches the position where it abuts on the existing pipe 3, First, all of the various equipment inside the shield machine, that is,
We will remove all of the clasping equipment such as face plates, slipping device, jack for shield propulsion, and erector.

Then, a lining body 5 having a blade edge structure for connecting the shield outer shell 1 and the existing pipe 3 is formed in a segment specification in the tip portion of the remaining shield outer shell 1, and this lining body 5 is thereafter formed. Propel in the direction of the arrow with the propulsion jack 6 installed on one side,
The tip is welded and fixed to the segment of the existing pipe 3 (in FIG. 1, the lining body 5 before and after propulsion is shown by a dotted line and a solid line, respectively).

The above-mentioned lining body 5 is formed into a predetermined shape and size in the factory with the same specifications as the segment lining of the new pipe 2, and then a plurality of blocks which can be handled manually. It may be divided into two parts, carried in to a predetermined position in the shield outer shell 1, and assembled there as before.

According to the method of the present invention, since the cutting face is opened during the joining work, the ground work is prevented so that the spouting of groundwater and the outflow of earth and sand from the cutting face do not hinder the joining work. It is important to carefully perform the construction of the improvement part 4, but if it is considered that the work safety cannot be ensured only by ground improvement, the pneumatic method can be applied as necessary during the joining work. As described above, it is preferable to prepare for the pneumatic construction method, for example, by installing the partition walls 7, 7 in the new pipe 2 as shown in the figure before starting the joining work.

After the tip of the lining body 5 is joined to the existing pipe 3 as described above, the propulsion jack 6 and the partition wall 7 are removed, and the inside of the shield skeleton 1 is reinforced and concrete is struck. Then, the reinforced concrete layer is formed, and the new pipe 2 and the lining body 5 are connected via this reinforced concrete layer.

[0012]

Since the method of the present invention is as described above, in addition to the effect of achieving the above-mentioned object, the shield machine used is not a special product as compared with the slide hood construction method, so that the manufacturing cost thereof is low. It is low, and since the lining body formed in advance in the shield outer shell is propelled and joined to the existing pipe, effects such as good construction efficiency can be expected.

[Brief description of drawings]

FIG. 1 is a sectional view for explaining an embodiment of a method of the present invention.

[Explanation of symbols]

1: shield outer shell, 2: new pipe, 3: existing pipe, 4: ground improvement part, 5: lining body, 6: propulsion jack, 7: bulkhead.

Claims (2)

[Claims] 1. When a new pipe for shield construction is underground-joined to an existing pipe, the ground around the joint is improved in advance by an appropriate construction method before the tip of the shield machine reaches the joint point. After removing all of the various equipments, the lining body with a blade structure that connects the shield outer shell and the existing pipe is formed with segment specifications in the tip of the remaining shield outer shell, and this lining body is placed behind it. A method of underground joining of a new pipe and an existing pipe for shield construction, characterized by propelling with a propulsion jack installed in the above, abutting the tip of the jack to the existing pipe, and joining. 2. The underground joining of a shielded new pipe and an existing pipe according to claim 1, wherein the pneumatic construction method is prepared before the joining work is started so that it can be applied as needed during the joining work. Method.