JPS63134794A - Shield excavator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Industrial Application Field The present invention relates to a shield excavator suitable for use in constructing a tunnel lining using cast-in-place concrete.

(b) Prior Art Recently, various proposals have been made for constructing a lining for a tunnel excavated by a shield excavator using cast-in-place concrete.

(C) 0 Problems to be Solved by the Invention However, a technology for effectively filling tail voids has not yet been established, and a shield excavator capable of filling the tail voids reliably and efficiently development is urgently needed.

SUMMARY OF THE INVENTION In view of the above-mentioned circumstances, an object of the present invention is to provide a shield excavator that can fill tail voids reliably and efficiently.

(d) Means for Solving Problem 1, ie 1 The present invention has an outer shell (2), a press ring (7) is installed inside the outer shell (2), and a press ring jack (
9) is provided so as to be movable and driveable with respect to the outer shell (2), and is attached to the inner circumferential surface (7b) of the press link (7), the diameter becoming smaller toward the front of the outer shell (2). It is constructed by forming a tapered concrete contact surface (7c).

Note that the numbers in parentheses are for convenience and indicate corresponding elements in the drawings.

This description is not limited to the description on the drawings.

The same applies to the column "r(e), Effect" below.

(e) 0 effect With the above-described configuration, the press ring (7) pressurizes the concrete (21) placed and filled in the concrete placement space (23), and
1) into the tail void (27).

(f), Example Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is a front sectional view showing an embodiment of the shield excavator according to the present invention, FIG. 2 is a sectional view taken along the line ■-■ in FIG. 1, and FIGS. 3 to 7 are the shield excavator according to the present invention. FIG.

The shield excavator 1 is as shown in FIG.

It has a cylindrical outer shell 2, and a cutter 3 is rotatably supported on the front surface of the outer shell 2, that is, the left side surface in FIG. The cutter 3 is connected to a drive motor 5 provided on a partition wall 2a of the outer shell 2, which is provided to block the space inside the outer shell 2 in the left-right direction. As shown in FIGS. 1 and 2, a plurality of them are arranged in a circular ring along the outer shell 2. A ram 6a is provided on the excavation jack 6 so as to be able to protrude and retreat in the direction of arrow 1.8, and a cylindrical press ring 7 is provided inside the outer shell 2 and is connected to the inner surface of the outer shell 2. They are provided so as to be slidable in the directions of arrows A and B so as to be in contact with each other.

As shown in FIG. 6, the inner circumferential surface 7b of the press ring 7 in FIG. 1 has a concrete contact i'[7c.

It is formed into a tapered shape that is inclined by a predetermined angle θ1 with respect to the directions of arrows A and B (the diameter of the inner circumferential surface 7b of the press ring 7 decreases as it goes toward the front of the outer shell 2, that is, in the direction of the arrow). Further, inside the press ring 7, as shown in FIG. 2, press ring jacks 9 are installed at predetermined intervals.
A plurality of them are arranged along the outer shell 2. In addition, between the press ring jacks 9, as shown in FIGS. 2 and 3, a plurality of concrete discharge pipes 10 connect the discharge opening LOa at the tip to the side surface 7a of the press ring 7, that is, the shield. The press ring 7 is provided with an opening at the rear of the excavator 1, and a seal 17a formed in an annular shape is attached to the outer peripheral surface of the press ring 7 in FIG.

By the way, a gauge ring 11 formed in an annular shape is attached to the tip of the ram 6a of the digging jack 6, and the gauge ring 11 has an engagement groove 11a that is connected to the gauge. An annular hole is formed around the entire circumference of the ring 11. Also.

A seal 17b formed in an annular shape is attached to the outer circumferential surface of the gauge ring 1], and a seal 17b formed in an annular shape is attached to the gauge ring 11, as shown in FIGS. 1 and 2. Formworks 13 are connected in the left-right direction in FIG.

Since the shield excavator 1 has the above configuration,
When excavating the tunnel 15, the cutter 3 is rotated by the drive motor 5, and the ram 6 of the excavation jack 6 is rotated.
A is made to protrude in the direction B in FIG. 1, and the cutter 3 is pressed in the direction of the face 16, that is, in the direction of arrow A, via the distance 8 m2 a and the outer shell 2. Then, due to the pressing force, the cutter 3 and the face 16 come into contact with each other with a predetermined contact pressure, the face 16 is excavated by the cutter 3, and at the same time, the outer shell 2 is excavated in the entry direction, and the tunnel 15 is connected to the shield excavator 1. behind, that is, the first
It is formed on the right side of the figure.

As the tunnel 15 is formed in this way, it is necessary to construct the lining 20 in order to prevent the excavated ground 19 from collapsing, but the construction of the lining 2○ is carried out in the following steps. . That is, when the shield excavator 1 has dug in the A direction by a length of 1 ring of the formwork 13, the ram 6a of the excavation jack 6 has moved in the B direction as shown in FIG. It is in a protruding state, and the press ring 7 is also in a state of moving in the B direction.

In this state, as shown in FIG. 4, the ram 6a is moved back in the incoming direction by a distance L1. Then, the gauge ring 11 separates from the end stop 22A and the formwork 13A of the part where the concrete 21 is poured directly, moves in the entry direction, and a gap is formed between the end stop 22A and the formwork 13A and the gauge ring 11. A space with a distance L1 is formed. Therefore, a reinforcing member 31 made of reinforcing steel or the like is installed in the space along with the end stop 22B through the engagement groove 11a, and a formwork 13B is assembled and installed in contact with the formwork 13A.

A concrete 1/casting space 23 is formed between the gauge ring 11 (end stop 22B), press ring 7, and end stop 22A.

In this state, the concrete supply pipe 25 is connected to the formwork 13B.

Concrete 21 is poured into the reconcrete placement space 23. In this way, when the concrete 21 has been cast in one annular shape in the concrete casting space 23, the press ring jack 9 shown in FIG. It is gradually moved in the entry direction from the standby position shown by the imaginary line in the figure. At this time, the tapered concrete contact surface 7c formed on the inner circumferential surface 7b of the press ring 7 is inclined at a predetermined angle θ1 with respect to the A and B directions, as shown in FIG. The surface 70 moves in the direction A in the form of pulling a, tt, from the concrete 21 placed in a conical shape. Therefore, no harmful frictional force that would hinder the movement of the press ring 7 in the A direction is generated between the concrete contact surface 7c and the concrete 21, and the press ring 7 can smoothly move in the A direction. It is done.

By the way, after the press ring 7 passes in the incoming direction,
Space 2 between outside FL2 and poured concrete 21
6 is formed (see Figure 6).

Therefore, along with the movement of the press ring 7 in the incoming direction.

Concrete 21 from concrete discharge pipe 10.

Pour into the space 26 and fill the space 26 with concrete. At this time, the annularly formed seals 17a and 17b shown in FIG. Since the space 23 and the space 26 are shielded from the outside.

Concrete 21 will not leak.

In this way, the press ring 7 is retreated to the position shown by the solid line in FIG.
2B, as shown in FIG. 7, the ram 6a of the excavation jack 6 is driven to protrude in the direction B, and the cutter 3 is rotated to start the excavation operation. Then.

As already mentioned, the outer shell 2 starts moving in the entry direction, and after the outer shell 2 moves, the poured concrete 21
A tail void 27 is formed between the ground and the ground 19. Here, as the outer shell 2 moves in the entry direction, the press ring jack 9 is driven to gradually move the press ring 7 in eight directions in synchronization with the eight movements of the outer shell 2. Then, the previously poured concrete 1 and the unhardened concrete 1 in the casting spaces 23 and 26 are pressed against the side surface 7a of the press ring 7 and flow to fill the tail void 27. .

At this time, since the press ring 7 is formed in a tapered shape in which the concrete contact surface 7c is inclined by a predetermined angle θ1 with respect to the A and B directions, a wedge effect is exhibited and the concrete contact surface 7c is not blocked by the unhardened concrete 21. No, the concrete 1
~Move in direction B within 21. Therefore, the concrete 21 is strongly compressed by the press ring 7 and flows into the tail void 27, so that the tail void 27 is well filled.

In this way, when the tail void 27 is filled and the outer shell 2 is propelled by one ring, construction of the lining 20 for one ring is completed.

(g) 1 Effect of the Invention As explained above, the present invention has an outer shell 2, and a press ring 7 is attached to the outer shell 2 through a press ring jack 9. The press ring 7 is provided with a tapered concrete contact surface 7c whose diameter becomes smaller toward the front of the outer shell 2 on the inner circumferential surface 7b of the press ring 7. By moving the concrete 21 in the space 23, 26 can be forced into the tail void 27, and the tail void 27 can be filled reliably and efficiently. In addition.

The press ring 7 has a tapered concrete contact surface 7C.
moves in the incoming direction in an attempt to pull it away from the concrete 21 that has been placed, so that it is between the concrete contact surface 7c and the concrete 21.

No harmful frictional force that would hinder the movement of the press ring 7 is generated, and the press ring 7 can be driven to move with a small amount of [13].

[Brief explanation of the drawing]

FIG. 1 is a top view showing an embodiment of a shield excavator according to the present invention. FIG. 2 is a sectional view taken along the line n-II in FIG. 1, and FIGS. 3 to 7 are process charts showing how the lining is constructed using the shield excavator according to the present invention. 1... Shield excavator 2... Outer shell 7... Press ring 7b... Inner peripheral surface 7c... Concrete contact surface 9. ---Presling jack applicant Mitsui Construction Co., Ltd. (and 1 other person) Agent: Patent attorney Phase 1) Case Department (and 1 other person) Figure 5 z/b

Claims (1)

[Scope of Claims] It has an outer shell, and a press ring formed in an annular shape is provided inside the outer shell so as to be freely movable and driveable with respect to the outer shell via a press ring jack, and the press ring A shield excavator comprising a tapered concrete contact surface whose diameter decreases toward the front of the outer shell on the inner peripheral surface of the outer shell.