JPH0396599A - Shield machine - Google Patents

Abstract

PURPOSE:To give an aligning function to a rear shield by composing a gauge ring for supporting the propulsion reaction of a shield body of a plurality of members and bringing the other members to a sliding-adjustable state in the radial direction to one members. CONSTITUTION:A shield body 1 is divided into the plural, and each shield la, 1b, 1c is formed in a bendable manner by connecting jacks 2, 3. Excavation is conducted by the revolution of a cutter head 7, excavation corresponding to one pitch is completed, a shield jack 13 is shortened and a gauge ring 15 is moved forward, and forms 16 are assembled in a space shaped by movement. The shield jack 13 is elongated, and concrete is placed into the forms 16 while propelling the shield body 1. The rear shield lc is shifted backward by the connecting jack 3, and concrete is pressed. Accordingly, the deterioration of a sealing effect can be prevented.

Description

[Detailed Description of the Invention] <Industrial Application Fields> The present invention relates to a tunnel boring machine used in the direct concrete lining method, and is particularly characterized in that the rear shield of the shield body has an alignment function. (Conventional technology) Conventional direct concrete lining method, in which concrete is placed along the inner wall of a tunnel excavated by a tunnel excavating machine to line the inner wall of the tunnel, involves assembling reinforcing bars at the time of assembling the formwork. There are two methods: one is to reinforce the lining wall by burying the reinforcing bars in concrete, and the other is a non-reinforced method that does not use reinforcing bars. In addition, for example, the shield excavator used in the unreinforced direct concrete lining method is
There are some, such as the one described in Publication No. 896, in which a gable frame with a concrete discharge port is provided at the rear of the shield body, and concrete is poured while the gable frame is propelled when the rear shield is propelled. ．． The above-mentioned gable frame is provided between the inner surface of the rear shield and the formwork, and a large gap is provided to facilitate sliding, and to prevent the poured concrete from penetrating. A seal is provided to be press-fitted on the inner surface of the shield.

(Problem to be solved by the invention) However, the above-mentioned conventional shield excavator does not. Since the gap between the gable frame, which is freely movable between the rear shield and the formwork, the rear shield, and the formwork is set large,
When the rear shield is propelled, it is difficult to bring the center of the rear shield of the gable frame and the center of the formwork together, and as a result, the crushing margin of the seal provided at the gable varies greatly depending on the location, so the portion with less crushing margin is There were problems such as infiltration of poured concrete and groundwater, and damage to seals in areas with large crushing allowances, which shortened the life of the seals prematurely.

This invention was made for the purpose of improving the above-mentioned problems. The aim is to provide a shield tunneling machine with an alignment function on the rear shield to prevent the sealing effect from deteriorating. (Means and effects for solving the problem) In order to achieve the above object, the present invention provides a shield excavator used in the direct concrete lining method.
Divide the shield body into multiple parts. Gauge I installed at the rear end of the shield junk, which is made freely bendable by connecting jacks between each shield, and which propels the shield body by using the formwork assembled at the rear of the shield body as a reaction force.
The J-ring is composed of two members, one member of which is slidable in the radial direction of the shield body.
By providing a shield member on the inner peripheral surface of the rear shield that is pressed against the outer peripheral surface of the formwork, even if misalignment occurs between the centers of the rear shield and the formwork, the centering can be fixed by sliding one member of the gauge ring. Make it possible to match. To provide a shield excavator in which there is no major change in the crushing margin of a seal member provided on the inner peripheral surface of a rear shield. <Example> An example of the present invention will be described in detail with reference to the drawings.

In the figure, 1 is the shield main body, which includes the front shield 1a,
It is guarded by a central shield 1b and a rear shield 1c, and each shield 1a. A connecting jack 2.3 is provided between 1b and 1c. These connecting jacks 2, 3
It can be bent freely. Further, a bulkhead 5 is provided at the front of the front shield 1a and is movable back and forth by a canter jack 4. The rear part of a canterhead 7 is rotatably supported on this partition wall 5 via a bearing 6. The canter head 7 is rotatably driven by a canter motor 8 attached to the bulkhead 5, and a number of canters 9 are protruded from the front surface of the canter head 7. As the cutter head 7 rotates, the face in front of the cutter head 7 is excavated.

Then, the earth and sand excavated by the cutter 9 is transferred from the earth and sand intake port (not shown) to the chamber 10 between the cutter head 7 and the partition wall 5.
After being taken inside. It is carried out to the rear of the shield body I by a screw conveyor 1) and an earth removal device (not shown). On the other hand, the proximal end of the shield jack 13 is attached to a support plate 12 protruding from the inner surface of the central shield Ib, and a ball bearing is mounted at the tip of a piston rod 13a that protrudes rearward from the shield jack 13. A gauge ring 15 is attached via 14, . The gauge ring 15 is brought into contact with the end face of a formwork 16 assembled along the inner peripheral surface of the rear shield 1c, so that the formwork 16 receives a propulsion reaction force when the shield body l is propelled. As shown in FIG. 2, the gauge ring 15 is comprised of two members 1 that are slidably abutted in the radial direction of the rear shield 1c.
5a and 15b, one member 15a is adapted to come into contact with the end surface of the formwork 16. The other member 15b has an outer peripheral surface that can freely slide on the inner peripheral surface of the rear shield 1c, and has an annular groove 15c on the outer peripheral surface.
is clearly expressed. Grease or the like is supplied to this annular groove 15c, and this oil reduces the sliding friction between the member 1c and the rear shield 1c. On the other hand, a sealing member l8 that is pressed against the outer circumferential surface of the formwork 16 is provided on the inner circumferential surface on the rear end side of the rear shield 1c. The seal member 18 is as shown in FIG. It is fitted into an annular groove ld formed on the inner peripheral surface of the rear shield 1c, and grease or the like is supplied from the oil supply path 1e to the front and rear of the seal member I8, so that the formwork 16 and the seal member 18
The sliding friction between them is reduced.

Further, a concrete pouring pipe 19 is arranged inside the rear shield 1c. Concrete can be poured between the tunnel inner wall and the formwork 16 through this concrete pouring pipe 19.

Next, the operation will be explained with reference to Figures 4 to 7. While the formwork 7 is rotated by the cutter motor 8, the shield body 1 is propelled by the shield jack 13 to dig. When the shield jack 13 is extended to the stroke end and the excavation for 1 inch is completed, the shield jack 13 is first Gauge ring 15 is shortened as shown in FIG.
Move forward. Next, formwork 1 is placed in the space created by the movement of gauge ring 15.
6, extend the shield junk l3 a little and bring the gauge ring 15 into contact with the end face of the newly assembled formwork I6 as shown in Figure 5. At this time, if there is a misalignment between the center of the formwork 16 and the center of the rear shield 1c. By moving the member 15 in contact with the formwork 16 in the radial direction by a driving means (not shown). The fitting portion 15d of this member 15a can be easily fitted into the formwork 16.

Next, while extending the shield jack 13 again and propelling the shield body l, the sixth
Concrete is poured between the tunnel inner wall and formwork 16 as shown in the figure. Concrete placement pressure is groundwater pressure +
In addition to preventing ground subsidence as it exceeds the loosened soil pressure,
In order to increase the filling rate of concrete, vibrations are applied to the poured concrete by attaching a shaker/vibrator (not shown) to the end face of the formwork 16 and rear shield 1C. When the shield jack 13 extends to the stroke end and concrete placement is completed, the rear shield 1c is moved back by the connecting jack 3 as shown in Fig. 7 to pressurize the poured concrete and remove any excess dirt caused by over-digging. Make sure that the space is sufficiently filled with concrete. Thereafter, the above-mentioned operation is repeated while digging, and since the cutter head 7 can be moved back and forth by the cutter head cylinder 4, it can also be propelled separately from the m-advance movement of the shield body 1.

Furthermore, curved construction is also possible by bending between each shield 1a, 1b, and 1c. In the above embodiment, the shield body 1 is of a three-fold type, but it may be of a two-fold type. In addition, although we have explained the case of a sealed earth excavating shield excavator, it can also be applied to manual excavating shields, semi-mechanical shields, mechanical excavating shields, etc. (Effects of the Invention) As described in detail above, the present invention comprises a gauge ring that supports the semi-progressive reaction force generated when the shield main body is propelled, and is composed of a plurality of members, and one member is connected to the other member in the radial direction. Because it is possible to adjust the slide. Even if the center of the rear shield and the formwork are misaligned, the centering function of the gauge ring allows the gauge ring members to be reliably fitted into the formwork. As a result, the crushing margin of the sealing member that seals between the gauge ring and the formwork does not change as much as in the conventional case, so an average sealing effect can be obtained over the entire circumference of the formwork. Since the crushing margin of the seal member is not locally excessive, it is possible to eliminate problems such as early deterioration of the sealing effect due to damage to the seal member.

In addition, the shield body is made up of multiple shields, and the placed concrete can be pressurized by retracting the rear shield using a connecting jack installed between each shield. Not only can the filling rate of concrete be increased, but the structure can also be simplified because there is no need to install gables or press rings like in the past.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and Fig. 1 is a cross-sectional view of the shield tunneling machine, Fig. 2 is an enlarged view of the area in the circle in Fig. 1, and Fig. 3 is an enlarged view of the area in the circle in Fig. 1. Figures 4 to 7 are diagrams explaining the action. l...Shield body, 2...Front shield. 1b...Central shield, 1c...Rear shield, 2.3...Connection jack. l3...Shield jack, 15...Gauge ring. 15a, 15b... members. 16... Formwork, 18... Seal member. l9...
・Concrete pouring pipe.

Claims (3)

[Claims] (1) In a shield excavator used for the direct concrete lining method, the shield main body 1 is divided into multiple parts, and connecting jacks 2,
3, the shield body 1 can be bent freely, and the formwork 16 assembled at the rear of the shield body 1 is used as a reaction force receiver.
The gauge ring 15 provided at the rear end of the shield jack 13 that propels the
This shield excavator is composed of members 15a and 15b, and is provided with a sealing member 18 on the inner circumferential surface of the rear shield 1c and pressed against the outer circumferential surface of the formwork 16. (2) A claim in which a concrete pouring pipe 19 is provided in the rear shield 1c, and concrete is poured between the tunnel inner wall and the formwork 16 from this concrete pouring pipe 19 as the shield body 1 is propelled. The shield excavator described in item (1). (3) The shield excavator according to claim 1, wherein after pouring the concrete, the rear shield 1c is moved rearward by the connecting jack 3 to pressurize the poured concrete.