JPH0540150Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a shield excavator used in the shield construction method.

[Prior Art] A conventionally used shield tunneling machine will be explained with reference to FIG. 6. Reference numeral 1 denotes a cylindrical front body frame, and a cutter 2 is rotatably mounted on the front side of the frame. The front part of the cylindrical rear body frame 3 is slidably inserted in the axial direction with a gap 4 maintained inside the rear part of the front body frame 1 and overlaps with the rear inner surface of the front body frame 1. A sealing material 5 and a gap adjustment holding material 6 are attached between the rear body frame 3 and the front outer surface thereof. A tail seal 8 is provided at the rear end of the rear fuselage frame 3 to prevent water leakage from entering through a gap between the tail seal 8 and the segment 7 assembled in a ring shape along the inner circumferential direction of the rear fuselage frame 3.
Together with the sealing material 5, the sealing performance between the front body frame 1 and the rear body frame 3 is ensured.

Along the inner circumferential surfaces of the front body frame 1 and the rear body frame 3, a propulsion jack 9 and a reaction force receiving jack 10 are arranged so that their operating directions are aligned with the front body frame 1.
A plurality of them are arranged in parallel with the axial direction of the rear body frame 3. The propulsion jack 9 has its pushing end fixed to an annular mounting plate 11 integrally projecting from the inner periphery of the front body frame 1, and its pulling end rod 12 to the inner periphery of the rear body frame 3. The propulsion jack 9 is provided so as to come into contact with an integrally protruding abutment plate 13, and the propulsion jack 9 takes a reaction force to the rear body frame 3 via the abutment plate 13, moves the front body frame 1 forward, and moves the cutter. 2 is propelled toward the face. The reaction force receiving jack 10 has its push side end fixed to an annular mounting plate 14 integrally formed on the inner periphery of the front end of the rear body frame 3, and the rod 15 at its pull side end attached to the rear body frame 3. It is provided so as to come into contact with the front end of a ring-shaped segment 7 that is assembled within the end, and applies a reaction force to the segment 7 to push out the rear trunk frame 3 and make it overlap deeply with the front trunk frame 1. An erector 17 is installed in the rear body frame 3 via a rotating roller 16, and is configured to rotate in the circumferential direction to assemble the segments 7.

[Problem to be solved by the invention] In the conventional shield excavator, the front body frame 1
When moving the front body frame 1 forward, the forward direction of the front body frame 1 may wobble using the gap adjustment holding member 6 as a fulcrum, causing the direction of excavation to be curved during straight excavation, or when excavating a curved tunnel, the front body frame 1 may become unstable. There were times when the vehicle did not move forward in the required direction.

It is an object of the present invention to provide a shield tunneling machine that eliminates these conventional drawbacks and allows the forward direction of the front body frame to be accurately controlled.

[Means for Solving the Problems] The shield excavator of the present invention has a front body frame having a cutter on the front side, and a front body frame that has a front part that overlaps with each other so as to be able to slide freely in the axial direction while maintaining a gap in the front body frame. It is characterized by comprising a trunk frame and a plurality of rollers supported by the front end of the rear trunk frame and pressed against the inner periphery of the front trunk frame.

[Operation] The forward direction of the front body frame can be accurately controlled by the rollers pressed against the inner periphery of the front body frame.

[Example] Hereinafter, an example of the present invention will be described based on the drawings.

FIG. 1 is a longitudinal sectional side view of one embodiment of the present invention, in which the same parts as in FIG.
The segment 7, rotating roller 16, and erector 17 shown in the figure are omitted from illustration. The propulsion jacks 9 and the reaction force receiving jacks 10 are actually arranged so that they are arranged alternately on one circle as shown in Fig. 2, so that the space in the center can be used effectively. There is.

As shown in FIGS. 1 and 2, a roller 19 is supported at the front end of the rear body frame 3 of the shield tunneling machine of the present invention via a balance jack 18. As shown in FIG. 3, the balance jack 18 is slidable in the radial direction via a bearing material 21 on a bracket 20 fixed to an annular mounting plate 14 integrally formed on the inner periphery of the front end of the rear fuselage frame 3. A roller 19 that can freely roll in the axial direction along the inner circumferential surface of the front trunk frame 1 is pivotally supported at the outer end of the balance jack 18 . balance jack 1
The piston rod 22 of No. 8 is connected to a support arm 23 fixed to the inner circumference of the mounting plate 14, and when pressure oil is supplied to the piston rod 22 side in the balance jack 18, the balance jack 18 moves outward in the radial direction. The roller 19 is pushed out and pressed against the inner periphery of the front body frame 1.

As shown in FIG. 2, a plurality of balance jacks 18 and rollers 19 (four in the illustrated case) are supported at the front end of the rear body frame 3 at equal angles in the radial direction. The front trunk frame 1 is guided by rollers 19 when moving forward. If the forces with which the plurality of rollers 19 press against the inner periphery of the front body frame 1 are made equal,
Gap 4 between front body frame 1 and rear body frame 3
is held uniformly, and the front body frame 1 moves straight. In addition, the pressure of the pressure oil supplied to the balance jack 18 can be independently controlled, so that the pressing force of one roller 19 in the radial direction is increased, and the pressing force of the roller 19 on the opposite side in the diametrical direction is increased. If it is weakened, the front body frame 1 will be replaced by the gap adjustment holding material 6.
The front end of the front body frame 1 is biased in the direction of the roller 19 with a strong pressing force using the rotation fulcrum, and in cooperation with the propulsion jack 9, a state suitable for excavating a curved tunnel is achieved. The amount of deflection of the front end of the front body frame 1 can be adjusted by the degree of change in the pressing force of the roller 19.

FIG. 4 shows another embodiment of the present invention, in which the same parts as in FIG. 3 are given the same reference numerals. In this embodiment, an oil supply circuit 24 that supplies oil from the outside with a predetermined reaction force P is connected to the side of the balance jacks 18, 18 opposite to the piston rod 22, and the piston rod 22 side of the balance jacks 18, 18 is connected to a pipe 2.
5, and by closing the valve 26, the pressing force of each roller 19, 19 can be fixed, and the front body frame 1 is guided to move straight or tilted forward.

FIG. 5 shows still another embodiment of the present invention, in which the same parts as in FIG. 3 are given the same reference numerals. In this embodiment, a spring 27 is provided inside the balance jack 18 to press the balance jack 18 and rollers 19 outward. By supporting a plurality of mounting plates 14 at equal angles in the radial direction, the gap 4 between the front body frame 1 and the rear body frame 3 is maintained uniformly, and the front body frame 1 can be moved straight. .

[Effects of the invention] In the present invention, a plurality of rollers supported at the front end of the rear body frame are pressed against the inner periphery of the front body frame, so the forward direction of the front body frame can be accurately controlled by the rollers. can do.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional side view of one embodiment of the present invention;
The figures are a sectional view of FIG. 1, FIG. 3 is a vertical sectional view of the balance jack, FIG. 4 is a vertical sectional side view of another embodiment of the present invention, and FIG. 5 is a further embodiment of the present invention. Fig. 6 is a longitudinal sectional view similar to Fig. 3, and Fig. 6 is a longitudinal sectional side view of a conventional shield tunneling machine. In the figure, 1 is the front body frame, 3 is the rear body frame,
4 is a gap, 18 is a balance jack, and 19 is a roller.

Claims (1)

[Scope of utility model registration request] A front body frame having a cutter on the front side, a rear body frame whose front parts overlap each other so as to be slidable in the axial direction while maintaining a gap within the front body frame, and the front body frame supported by the front end of the rear body frame. A shield excavator characterized by comprising: a plurality of rollers pressed against the inner periphery of the shield excavator.