JP3359486B2 - Method of joining tunnels of different diameters using shield machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an underground joining method for tunnel excavation using a shield machine.

[0002]

2. Description of the Related Art In recent shield construction methods, there has been a tendency to increase the depth and the distance, and from the viewpoint of securing land and economical efficiency, an underground joining method has been adopted.

[0003] As the underground joining method, there is a method using both the mechanical docking method and the auxiliary method. The method using the auxiliary method is superior in terms of safety and reliability. As the auxiliary method, there are a chemical liquid injection method, a ground replacement method, a freezing method, and the like. Among them, the freezing method is superior in terms of reliability.

[0004] Hereinafter, a method using this freezing method together will be described with reference to the drawings. FIG. 3 shows a case where tunnels having the same diameter are connected to each other. In this case, after the shield excavators 51 and 52 having the same diameter are stopped at positions facing each other, the shield bodies 53 and 54 of the respective shield excavators are stopped. From the tip outer peripheral part, forward and diagonally outward, respectively
A large number of freezing pipes 55 and 56 are protruded to freeze the ground near the junction between the shield excavators 51 and 52.

[0005]

In the above-mentioned freezing method, there is no problem if the tunnels to be joined have the same diameter. However, the tunnels having different diameters and the outer peripheral portion at a predetermined position are aligned. 4, the tip positions of the freezing pipes 55, 56 projecting toward the ground from the shield excavators 51, 52 become asymmetrical positions when viewed from the side, as shown in FIG. Therefore, there is a problem that the freezing range is widened, which is uneconomical and requires a long time for the freezing operation.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a joining method capable of performing a freezing operation economically and in a shorter time when joining tunnels having different diameters by a shield machine.

[0007]

In order to solve the above-mentioned problems, a method of joining tunnels having different diameters by a shield machine according to the present invention uses tunnels having different diameters.
Excavation with a shield excavator and both shield excavation
The above-mentioned tunnels are
When joining, in places where the outer peripheral surfaces of the large-diameter side shield main body and the small-diameter side shield main body are close to each other, diagonally forward and outward from the outer peripheral portion of the front end of each shield main body At locations where the freezing tube is projected and separated from each other, the freezing tube is projected forward and along the axis of the shield main body from the front surface of the large-diameter side shield main body to form a joint. This is a method of freezing the ground underneath.

According to the above-mentioned joining method, when tunnels having different diameters are joined by a shield excavator, a stepped portion is projected forward and obliquely outward when compared with a case where a freezing tube is projected. Thus, the freezing range can be narrowed.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A method for joining a tunnel according to an embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 is a side view showing a state where two tunnels having different diameters are joined to each other. In FIG. 1, 1
Is a first shield excavator for excavating a large-diameter tunnel, and 2 is a second shield excavator for excavating a small-diameter tunnel. (The outer peripheral portion), for example, the upper end surface (the upper end portion) is stopped so as to coincide.

In this state, the front ends of the shield body (hereinafter, referred to as a first shield body) 3 of the first shield machine 1 and the shield body (hereinafter, referred to as the second shield body) 4 of the second shield machine 2 are provided. The freezing tubes 5 and 6 project from the outer peripheral portion toward the ground around the joint portion by a predetermined length. Of course, the amount of protrusion is determined according to the range to be frozen.

Among these freezing tubes, the freezing tubes 5A, 5A, which are installed at the upper portions where the outer peripheral surfaces of the first shield body 3 on the large diameter side and the second shield body 4 on the small diameter side are close to each other.
In 6, each of the shield bodies 3, 4 is protruded forward and obliquely outward from the outer peripheral portion of the front end thereof, and is installed at a location where the outer peripheral surfaces of both shield bodies 3, 4 are separated from each other. The freezing tube 5B protrudes forward from the front surface of the first shield main body 3 and along the axis of the shield main body 3, that is, in the horizontal direction.

FIG. 2 shows the horizontal position of the freezing tube 5 protruding from the first shield main body 3. That is, in the front half (the face plate of the cutter head) 3a of the first shield body 3, within the crescent-shaped range of the lower half,
The freezing tube 5B is projected horizontally at predetermined intervals.

In this state, the coolant is supplied into the freezing tubes 5 and 6, and the surrounding area, that is, the ground near the joining position is frozen, so that the joining work can be performed safely.
As described above, when the tunnels having different diameters are joined to each other by the shield excavators 1 and 2, a portion where the outer peripheral surfaces of the shield bodies 3 and 4 of the shield excavators 1 and 2 approach each other, is directed forward. And a tube 5 for freezing diagonally outward.
6 is protruded, and the portion where the outer peripheral surfaces of the shield bodies 3 and 4 are separated from each other from the face plate 3a side of the large-diameter shield body 3 along the small-diameter shield body 4
Since the freezing tube 5B is made to protrude, the freezing range can be narrowed in such a stepped portion as compared with the case where the freezing tube is protruded forward and obliquely outward. Therefore, the joining operation can be performed inexpensively (economically) and in a short time.

[0015]

As described above, according to the joining method of the present invention, when the tunnels having different diameters are joined by the shield machine, the portion where the outer peripheral surfaces of the shield bodies of the shield machines approach each other is considered. Is to project the freezing tube forward and obliquely outward, and at the part where the outer peripheral surfaces of the shield bodies are separated from each other, the freezing pipe is frozen from the large-diameter shield body side toward the small-diameter shield body side. Since the projecting pipe is made to project, the freezing range can be narrowed compared to the case where the stepping part is projected forward and diagonally outwardly, and therefore, The joining operation can be performed economically and in a short time.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a bonding method according to an embodiment of the present invention.

FIG. 2 is a view taken along the line AA of FIG. 1;

FIG. 3 is a cross-sectional view showing a joining method in a conventional example.

FIG. 4 is a cross-sectional view showing a joining method in a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 1st shield excavator 2 2nd shield excavator 3 1st shield main body 4 2nd shield main body 5, 6 Freezing pipe

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-63-118493 (JP, A) JP-A-2-132291 (JP, A) JP-A-7-301090 (JP, A) JP-A-6-301 346686 (JP, A) JP-A-8-28182 (JP, A) JP-A-8-232576 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) E21D 9/06 301

Claims (1)

(57) [Claims] 1. A method for tunneling tunnels having different diameters from each other.
Excavation with these two shield excavators
The above-mentioned tunnels are
When joining, at locations where the outer peripheral surfaces of the large-diameter side shield main body and the small-diameter side shield main body are close to each other, freezing diagonally forward and outward from the outer peripheral portion of the front end of each shield main body. In the places where the pipes are projected and separated from each other, the freezing pipes are projected forward and along the axis of the shield main body from the front surface of the large-diameter side shield main body, near the joint. A method of joining tunnels of different diameters using a shield machine, wherein the underground is frozen.