JP2000087683A - Shield machine, and tunnel execution method thereby - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an execution method capable of easily changing the curvature by arranging a specified number of excavating and advancing machine bodies adjacent to each other while deviating them from one another in the longitudinal direction successively from one side to adjust the thrust of respectively provided propulsion jacks. SOLUTION: Cutter heads 1A-1C are provided adjacent to each other on a tip part of first to third excavating and advancing machine bodies 2A-2C of different length in a shield machine 1. The cutter heads 1A-1C are arranged at the position successively deviated backward by the difference in length of the first to third excavating and advancing machine bodies 2A-2C, and propulsion jacks 3-5 are arranged on the circumference with specified intervals. An auxiliary blade 6 to be advanced/retracted to/from the ground G side at a specified angle α is provided on a side part of the third excavating and advancing machine body 2C. A curved tunnel of different curvature can be executed while keeping a specified propulsion force by adjusting the propulsion force of the propulsion jacks 3-5, and the curvature can be easily changed. The smooth execution can be effected by projecting the auxiliary blade 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a shield machine and a tunnel construction method for the shield machine.

[0002]

2. Description of the Related Art Conventionally, as shown in FIGS. 3 and 4, a triple shield excavator (also referred to as a triple multiface shield excavator) is arranged such that a central face plate 20 precedes and face plates 21 and 21 on both sides. 22, a geometric center (center of gravity) A exists in the central shield 23.

[0003]

In the above-mentioned conventional triple shield excavator, the central face plate 20 precedes and the face plates 21 and 22 on both sides follow. , Because it exists in the central shield 23,
When performing the curve construction, it was necessary to adjust the propulsion force of the propulsion jack.

Accordingly, an object of the present invention is to provide a shield machine and a tunnel construction method for the shield machine capable of solving the above-mentioned problems.

[0005]

Means for Solving the Problems In the present invention, three or more excavator bodies are provided adjacent to each other, and one excavator body is sequentially shifted from the other excavator body in the front-rear direction. It is configured as follows.

[0006] At least one of the excavator bodies on both sides is provided with an auxiliary wing that is capable of protruding and retracting at a predetermined angle on the ground side toward the rear with respect to the excavator body. In the above configuration, three or more excavator bodies are provided adjacent to each other, and one excavator body is arranged in the front-rear direction from the other excavator body in order to impart the same propulsive force to each excavator body. Curve construction is performed, and instead of imparting equal propulsion force to each excavator body, a different propulsion force is applied to change the curvature for curve construction.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. As shown in the plan view of FIG. 1, a shield machine 1 according to an embodiment of the present invention includes cutter heads 1A to 1C at the distal ends of first to third machine bodies 2A to 2C having different lengths. Equipped, first to third machine 2A
2C are disposed adjacent to each other, and the cutter heads 1A to 1C are provided with first to third excavator bodies 2A to 2C.
From the cutter head 1A of the first machine 2A to the cutter head 1 of the second machine 2B by the length of C
B, the cutter head 1C of the third excavator main body 2C is disposed at a position shifted rearward in the order of the cutter head 1C, and the rear end surfaces of the first to third excavator main bodies 2A to 2C are arranged at predetermined positions parallel to the cutter heads 1A to 1C. They are in the same plane. The first to third excavator bodies 2A to 2C are provided with a plurality of propulsion jacks 3 to 5 at predetermined intervals on the circumference.

With this configuration, the geometric center (center of gravity) P of the shield machine 1 is configured to be present on the first machine body 2A side. It should be noted that the ground G is provided on the side of the third machine body 2C toward the rear with respect to the third machine body 2C.
An auxiliary wing 6 that protrudes and disappears at a predetermined angle α is provided on the side.

In FIG. 2, the moment M acting on the geometric center by the propulsion force of a predetermined propulsion jack (the propulsion jack 3 is shown in the figure) is M = F ·
It is represented by R · cosβ. In this formula, F: the propulsion force of the predetermined propulsion jack R: the distance from the geometric center P to the predetermined propulsion jack β: the distance between the geometric center P and the predetermined propulsion jack and the horizontal axis h The angle to make. Therefore, the moment acting on the geometric center P is calculated by setting the diameters of the first to third excavator bodies 2A to 2C, determining the positions of the propulsion jacks 3 to 5, and determining F. Will be.

In the above configuration, assuming that the resultant forces of the propulsion jacks 3 to 5 provided in the first to third excavator main bodies 2A to 2C are equal, for example, the ground G
Excavation, the shield machine 1 can excavate in a curved manner as shown by an arrow D in FIG. This is because the shield machine 1 is displaced rearward in the order of the first machine body 2A, the second machine body 2B, and the third machine body 2C from the first machine body 2A. Target P exists on the first excavator main body 2A side, and the resultant force of the propulsion forces of the propulsion jacks 3 to 5 is as follows:
Deviated from the geometric center P (in FIG. 1, the first machine body 2
This is because the second excavator main body 2B of A works). Also,
By projecting the auxiliary wing 6 at a predetermined angle, it is possible to perform a curved construction more smoothly.

As described above, since the resultant force of the propulsion jacks 3 to 5 is shifted with respect to the geometric center P, the propulsion force of each of the propulsion jacks 3 to 5 is specially controlled. (Even if the propulsion forces of the propulsion jacks 3 to 5 are set equal), the ground G can be curved and excavated.

Also, by changing the propulsion force of the jacks 3 and 5 on both sides, the magnitude of the moment acting on the geometric center P can be changed to easily change the curvature of the excavated curve. it can.

For example, in the state where the number of the propulsion jacks 3 to 5 is the same and the propulsion force is equal, the propulsion jacks 4 with respect to the combined propulsion force of the propulsion jacks 3 to 5 are used.
The ratio of the resultant force of the propulsion is (number of propulsion jacks 4) /
(Total number of propulsion jacks 3 to 5). The resultant force of the propulsion jacks 4 is held at this ratio, and the propulsion forces of the propulsion jacks 3 and the propulsion jacks 5 on both sides are adjusted, so that the magnitude of the moment acting on the geometric center P is adjusted. In this way, it is possible to construct tunnels having different curvatures while maintaining a predetermined driving force.

For example, while keeping the resultant force of the propulsion jack 4 constant, the resultant force of the propulsion jack 3 is reduced by a predetermined amount, and the resultant force of the propulsion jack 5 is increased by the same amount. By doing so, it is possible to perform curved construction of tunnels having different curvatures.

By setting the resultant force of the propulsion forces of the propulsion jacks 3 to 5 so that the moment acting on the geometric center P becomes zero, it is possible to cope with straight-line construction. Although not shown, the hydraulic control of the propulsion force of each of the propulsion jacks 3 to 5 is performed by a relief valve and a pressure reducing valve provided in a pipe.

Further, in the above-described embodiment, the description has been given of the triple shield excavator 1. However, the present invention is not limited to this, and a quadruple or more cutter head and an excavator main body may be used as necessary. Shield machine 1
Can also be adapted. In these cases, when the geometric center P of the shield machine 1 is located on the first machine body 2A side, and the propulsion jack is driven with the same force as described above, the shield machine 1 performs a curved construction. be able to. Since the geometric center P of the shield machine 1 is shifted toward the first machine body 2A, the first to third machine bodies 2A to which the propulsion jacks 3 to 5 protrude.
Assuming that the propulsion of 2C is equal, each propulsion jack 3 ~
The curved ground G can be constructed without controlling the propulsion force of the fifth embodiment.

[0017]

As is apparent from the above description, according to the present invention, three or more excavator bodies are provided adjacent to each other, and one excavator main body is sequentially shifted in the front-rear direction from the other excavator main body. With such a configuration, the same propulsion force is applied without changing the propulsion force applied to each of the excavator bodies, and the curve construction can be easily performed.

[Brief description of the drawings]

FIG. 1 is a schematic plan view of a main part of a shield machine showing an embodiment of the present invention.

FIG. 2 is a front view of the same.

FIG. 3 is a schematic plan view of a main part of a conventional shield machine.

FIG. 4 is a plan view of the same.

[Explanation of symbols]

 Reference Signs List 1 shield excavator 2A first excavator main body 2B second excavator main body 2C third excavator main body 3 jack for propulsion 4 jack for propulsion 5 jack for propulsion 6 auxiliary wing G ground mountain P geometric center

 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Koichiro Nakayama 1-89, Minami Kohoku, Suminoe-ku, Osaka-shi, Osaka F-term in Hitachi Zosen Corporation 2D054 AA02 AB03 GA04 GA34 GA34 GA56

Claims (4)

[Claims] 1. A shield machine wherein three or more machine bodies are provided adjacent to each other, and one machine body is sequentially shifted from the other machine body in the front-rear direction. 2. At least one of the machine bodies on both sides,
2. An auxiliary wing, which is provided at a predetermined angle on the ground side toward the rear with respect to the excavator main body, and is capable of protruding and retracting at a predetermined angle.
The shield machine described. 3. An excavator body having three or more excavator bodies adjacent to each other, and one excavator body being disposed in order from the other excavator body in the front-rear direction so as to impart the same propulsion force to each excavator body. A tunnel construction method for a shield machine, wherein the tunnel construction is performed by a curved construction. 4. The tunnel construction method in a shield machine according to claim 3, wherein a different propulsion force is applied to each excavator body instead of applying the same propulsion force to change the curvature for performing the curve construction. .