JPH0617920Y2 - Lining shield machine - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention is a shield machine, after excavating a tunnel,
The present invention relates to a lining shield excavator (hereinafter also referred to as a shield machine) that is lined by the cast-in-place lining method. Concerning the structure of.

[Conventional technology]

In the method of excavating a tunnel while excavating a tunnel with a shield machine, meandering of the shield machine is inevitable due to geological changes in the ground. In addition, the tunnel itself may be excavated by a curved line.

By the way, in the conventional cast-in-place lining method (method of excavating the shield while extruding the concrete filled in the tail frame), when performing meandering correction or curved construction, as shown in Fig. 6 (a). Then, after the current pouring concrete 13 is poured and filled in the tail frame 1, the shield machine is displaced in a predetermined direction. In addition, there is also proposed a method in which a bent portion can be bent at the connecting portion when the vehicle is bent (for example, see Japanese Patent Publication No. 58-7800).

[Problems to be solved by the device]

However, as shown in FIG. 7, which is an enlarged view of the main part of FIG. 6 (b), the tail frame 1 advances in the tangential direction of the construction curve, and the tail frame 1 causes the diagonal line portion 13a of the currently cast concrete 13 to move. It is pushed away and the seal 10a of the wife frame 10 is also crushed. Therefore, as a result of the restraint force and resistance force from the currently-placed concrete 13 and the like impeding the maneuverability of the shield machine itself, the meandering correction and the curved construction become difficult.
Further, the seal 10a or 10b needs to have a height that can follow this displacement, which causes a problem that the sealing performance and the like deteriorate.
In particular, as with the already-placed concrete 11, the currently-placed concrete 13 becomes extremely difficult to correct after meandering. Further, the shield machine described in Japanese Patent Publication No. 58-7800 has a disadvantage that it is longer than the conventional one.

Therefore, in view of the above-mentioned conventional problems, the present invention provides a lining shield excavator that can easily perform curved construction and meandering correction without generating the resistance force of the concrete poured into the tail and has a good straightness. The purpose is to do.

[Means for Solving the Problems]

In order to achieve the above object, the present invention provides an auxiliary tail frame concentrically with the tail frame of a shield machine and an inner formwork concentrically inside the tail frame. A gable frame which slides between the inner mold and the auxiliary tail frame is provided, and a fluid is extended in the space formed between the tail frame and the auxiliary tail frame in the longitudinal direction of the outer peripheral surface of the auxiliary tail frame. A lined shield machine having an elastic body made of an air bag or a cushion material to which a fluid of a predetermined pressure is supplied from a source.

[Action]

In the above configuration, for example, when the shield machine is displaced in a predetermined direction for curved construction, the front end portion of the elastic body such as an airbag interposed between the tail frame and the auxiliary tail frame is moved by the tail frame. It is crushed gradually in the displacement direction and absorbs this displacement. Therefore, the tail frame can move forward without pushing away the currently cast concrete, and does not receive the restraining force and the resistance force from the currently cast concrete. As a result, the shield machine can be easily displaced in the desired direction.

〔Example〕

Embodiments of a lining shield machine according to the present invention will be described below with reference to the drawings.

Fig. 1 is a longitudinal sectional view of a lining shield machine used for cast-in-place lining method, Figs. 2 (a) and (b) are longitudinal sectional views of the main part of the shield machine tail, and Fig. 3 is a shield machine tail. It is drawing which shows another Example of a part. Fig. 4 is a transverse cross-sectional view of the main part of the shield machine, and Figs. 5 (a) to (d) are drawings showing the operation of the tail part of the shield machine during curve construction (or meandering correction) over time. .

As shown in FIG. 1, a cylindrical tail frame 1 is formed on the outer periphery of the tail portion of the shield machine, and an auxiliary tail frame 3 is concentrically provided inside the tail frame 1. Moreover, in the space formed between the tail frame 1 and the auxiliary tail frame 3, an elastic body 2 such as an air bag is interposed along the outer peripheral length of the auxiliary tail frame 3. Inside the auxiliary tail frame 3, an inner formwork 12 is concentrically and sequentially constructed along with the excavation of the shield machine. Between the natural ground G and the inner formwork 12, the already placed concrete 11 is poured and filled. Has been done. A gable frame 10 is provided which slides between the auxiliary tail frame 3 and the inner formwork 12.
The currently cast concrete 13 which is partitioned by the gable frame 10 and is pressurized is poured and filled so as to form a lining body that is continuous with the already cast concrete 11. Reference numeral 9 is a wife frame jack for moving the wife frame 10 forward and backward. Reference numeral 6 is an auxiliary tail jack for moving the auxiliary tail frame 3 forward and backward.

A more detailed description will be given with reference to an enlarged view of the main part of FIG.
The tip portion 1a of the tail frame 1 is formed in a tapered shape in order to reduce the tail voids as much as possible, and moreover, is slightly projected from the tip portion of the auxiliary tail frame 3. On the other hand, the elastic body 2 such as an airbag is provided in the length range of the auxiliary tail frame 3. A base end portion of the auxiliary tail frame 3 is fixed to a rectangular auxiliary tail ring 4 via a bracket 5. Reference numeral 8 is a sealing material that is provided so as to protrude from the outer periphery of the auxiliary tail ring 4 for sealing with the tail frame 1.
The auxiliary tail rings 4 are hinged to the rod portions of the auxiliary tail jacks 6 provided in the circumferential direction. Although not shown, the auxiliary tail jack 6 is connected to the shield machine main body so that the auxiliary tail jack 6 can move forward without changing the relative position as the shield machine digs.

A sealing material 7 is provided on the inner and outer circumferences of the gable frame 10 over the entire circumference so as to partition and seal the concrete placing space. A gable frame jack 9 is connected to the gable frame 10. The actuation of the gable frame jack 9 pressurizes the currently-placed concrete 13 to the tail void (the space after the tail frame 1 and the like have moved). It is designed to be filled with concrete.

The elastic body 2 has a function as long as it maintains a constant space between the tail frame 1 and the auxiliary tail frame 3 and is deformable so as to absorb the directional displacement of the tail frame 1. . Therefore, the elastic body 2 is, as shown in another embodiment of FIG. 3, in addition to the airbag,
It may be a cushion material formed in a trapezoidal shape from rubber or soft plastic.

When the elastic body 2 is formed of an airbag, it is convenient to provide the air source in the shield machine so that the airbag can be appropriately filled with air and the air pressure of the airbag can be adjusted and changed. Instead of air, other gas or liquid having good fluidity may be enclosed in the airbag. On the other hand, as shown in FIG. 4, the elastic body 2 such as the airbag may be divided into an appropriate number in the circumferential direction so that it can be easily replaced in response to the damage of the airbag. . Further, it may be divided not only in the circumferential direction but also in the axial direction.

Next, the operation of the tail portion of the shield machine when performing curved construction (or correction of meandering) will be described based on FIGS. 5 (a) to 5 (d).

FIG. 5 (a) shows the auxiliary tail frame 3, the inner formwork 12, and the end frame 1.
The figure shows the state at the start of excavation of the shield machine after the concrete has been poured and filled in the space formed by 0 and 0.

From this state, as shown in FIG. 5 (b), the shield machine is dug forward by a propulsion jack (not shown), and the tail frame 1, the airbag 2 and the auxiliary tail frame 3 are integrally advanced while simultaneously moving in a predetermined direction. (Downward in this example)
Displace the shield machine. At this time, the tail frame jacks 9 are actuated to pressurize the currently placed concrete 13, and the tail voids after the tail frame 1 and the like are pulled out are filled with concrete. Due to the downward displacement of the shield machine, the elastic body 2 such as an airbag is crushed in the front portion and gradually inflated in the rear portion (second portion).
(See Figure (b)). In other words, even if the shield machine is displaced in the direction, the tail frame 1 only squeezes the front end of the elastic body 2 such as an air bag, so that it does not receive any resistance from the currently placed concrete 13. . In this way, the directional displacement of the shield machine is caused by the elastic body 2 such as an airbag.
Since it is absorbed by the deformation of the shield machine, the shield machine can smoothly go through the curve.

Further, the tail frame 1 and the like move forward to and stop at the end frame 10 as shown in FIG. 5 (c) as the shield machine advances. After this, the end frame jack 9 is operated to pull in the end frame 10, the reinforcing members such as reinforcing bars are assembled, and the inner form frame 12 ′ that has been demolded from other parts is shown in phantom lines. 12 is connected to the inner frame 12 and the gable frame 10 is formed in
Move to the front end of the new concrete placing space 1
Form 3 '. At this time, a taper liner 14 having a wedge-shaped cross section is sandwiched between the taper liner 14 and the existing inner formwork 12 in order to match the direction of the tunnel alignment. At this stage, the elastic body 2 such as the airbag can be returned to its original shape because the auxiliary tail frame 3 is released from the restraint of concrete as shown in FIG. 2 (a). , A certain space is restored between the tail frame 1 and the auxiliary tail frame 3.

Then, as shown in FIG. 5 (d), as in FIG. 5 (a),
Concrete is poured and filled in the new concrete casting space 13 '. After this, the tail frame 1 is removed by excavating the shield machine in the same manner as in FIG. 5 (b).
And the like are advanced and displaced in a predetermined direction. Then, the above-described steps are sequentially repeated to perform curved construction while excavating the shield machine in a desired direction. The procedure for correcting meandering is the same as above.

If you are going straight, increase the air pressure of the airbag,
By using the restraining force of the currently-placed concrete 13, construction with good straightness is performed.

[Effect of device]

As described above, according to the present invention, the shield machine can be easily displaced in a desired direction by elastic deformation of an elastic body such as an air bag interposed between the tail frame and the auxiliary tail frame. .

In this way, due to the action of the elastic body, the tail frame and auxiliary tail frame etc. can easily move forward on the tangent line of the construction curve without receiving the restraint force or resistance force from concrete, resulting in improved maneuverability of the shield machine. However, it is possible to easily and accurately perform curved construction of the tunnel or correction of meandering,
In addition, the effect of improving straightness can be obtained.

[Brief description of drawings]

1 to 5 are drawings for explaining an embodiment of the present invention, and FIG. 1 is a longitudinal sectional view of a lining shield machine used for a cast-in-place lining method, and FIG.
Figures (a) and (b) are longitudinal cross-sectional views of the main part of the shield machine tail, Fig. 3 is a drawing showing another embodiment of the shield machine tail, and Fig. 4 is a cross-sectional view of the main part of the shield machine. 5 (a) to 5 (d) are diagrams showing the operation of the tail portion of the shield machine when a curved construction or meandering correction is performed. 6 (a) (b) and FIG. 7 are drawings for explaining curved construction in the conventional cast-in-place lining method. 1 ... Tail frame 2 ... Elastic body (airbag or cushion material) 3 ... Auxiliary tail frame 4 ... Auxiliary tail ring 6 ... Auxiliary tail jack 9 ... Wife frame jack 10 ... Wife frame 11 ... Already Casting concrete 12 …… Inner formwork 13 …… Current casting concrete 14 …… Taper liner.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Naomichi Otani No. 2 Sanbancho, Chiyoda-ku, Tokyo Inside Tobishima Construction Co., Ltd. (72) Inventor Yoshikazu Inada No. 2 Sanbancho, Chiyoda-ku, Tokyo Tobishima Construction Co., Ltd. (72) Inventor Susumu Sarada 3-1-1 Higashikawasaki-cho, Chuo-ku, Kobe-shi, Hyogo Kawasaki Heavy Industries, Ltd. Kobe factory (72) Revised by Kiyohide 3-1-1 Higashikawasaki-cho, Chuo-ku, Kobe-shi, Hyogo No. Kawasaki Heavy Industries, Ltd. Kobe factory (56) Reference Japanese Patent Laid-Open No. 1-256700 (JP, A) Shoukai 55-67294 (JP, U)

Claims (1)

[Scope of utility model registration request] 1. A shield excavator, wherein an auxiliary tail frame is provided in the vicinity of the inside of the tail frame concentrically with the tail frame, and an inner mold is provided concentrically further inside the auxiliary tail frame. A slidable frame is provided between the tail frame and the tail frame, and a fluid having a predetermined pressure is supplied from a fluid source to the space formed between the tail frame and the auxiliary tail frame over the lengthwise direction of the outer peripheral surface of the auxiliary tail frame. A lining shield machine having an elastic body made of an air bag or a cushion material supplied.