JPH0774586B2 - Tunnel branching method by shield excavator and excavator cutter plate - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for excavating a branch tunnel from a tunnel lined with a segment and a cutter plate for a shield machine used for carrying out this method.

[0002]

2. Description of the Related Art Conventionally, a part of a tunnel is widened,
Alternatively, in order to construct a branch tunnel, for example, Japanese Patent Publication No. 61-45035 or Japanese Patent Publication No.
The method described in Japanese Patent Publication No. 2-1073 is adopted.

In these methods, a vertically elongated rectangular widening forming segment member is incorporated as a part of the lining segment during tunnel lining, and a reaction force is applied to the inner surface of the tunnel lining corresponding to the segment member. The segment member is pushed by a jack in the direction of tunnel widening.

In the former method, the earth and sand are excavated by hand through the earth and sand inlets provided at the upper and lower portions of the segment member, and in the latter method, the rotary cutter of the excavator is projected from the upper and lower earth and sand inlets. The earth and sand are excavated in this manner, and the widened portion is formed by sequentially connecting the box frames of the same shape to the back surface of the segment member in accordance with the propulsion of the segment member.

[0005]

However, according to the former method, since the segment member has to be press-fitted into the ground, the segment member can be propelled only into the soft ground such as clay layer, and the latter method. According to the method, it is possible to excavate hard ground because it is mechanical excavation, but since the ground is excavated by the cutter of the excavator through the earth and sand inlets provided at two upper and lower positions of the segment member, the segment member There is a problem in that a dug portion is formed on the front surface of the base material, which makes it difficult to smoothly promote the segment member, resulting in a decrease in work efficiency.

Further, in any of these methods, since the segment member has a relatively small area that can be carried into the lining tunnel, even if it can be adopted as a method for widening a part of the tunnel, it is circular. Moreover, it is not suitable for excavating a branch tunnel having a relatively large cross section. The present invention solves such a problem, a tunnel branching method by a shield excavator capable of efficiently excavating and forming a circular branch tunnel from a desired portion of a lining tunnel, and a shield excavator suitable for implementing this method. The purpose is to provide a cutter plate of.

[0007]

In order to achieve the above object, a method of branching a tunnel by a shield excavator according to the present invention is as follows. First, at the time of tunnel lining, a circle divided in advance for each width of a lining segment. The cutter plate of 1 is incorporated into the lining at the tunnel branch position as part of the lining segment. During excavation of the branch tunnel, a skin plate having a partition inside and a drive device disposed on the rear side of the partition is installed in the lining tunnel, and a rotary shaft rotated by the drive device is attached to the lining segment. The shield excavator is assembled by connecting and integrating with the center of the circular cutter plate forming a part of the. Then, the shield excavator is moved forward and the cutter plate is rotated to excavate the branch tunnel.

Further, as a cutter plate of a shield excavator used for carrying out the above method, a circular cutter is formed by detachably connecting divided cutter plate pieces which are vertically divided for each width of a lining segment. It is configured to form a plate.

[0009]

Since the cutter plate of the shield excavator for excavating the branch tunnel is divided into a plurality of pieces in the vertical direction for each width of the lining segment, the tunnel is formed at a predetermined position of the lining tunnel where the branch tunnel is to be formed. It can be assembled together with the lining segment and connected to a circular cutter plate. When excavating a branch tunnel from inside the lining tunnel, a skin plate is installed on the back side of the cutter plate, and the rotary shaft of the drive device arranged in the skin plate is connected to the center of the cutter plate to shield. The excavator is assembled. After that, the branch tunnel is dug in a desired direction while rotating the cutter plate in the same manner as in the usual shield construction method, and segment wall lining is applied to the tunnel wall surface.

[0010]

Embodiments of the present invention will now be described with reference to the drawings.
Reference numeral 1 is a circular cutter plate for excavating the branch tunnel B from the lining tunnel A, and as shown in FIG. 2, it is divided vertically according to the width of the lining segment 2 of the lining tunnel A in the tunnel length direction. Are formed on a plurality of divided cutter plate pieces 1a, 1b, 1c. These split cutter plate pieces 1a, 1b, 1c
The vertical division surfaces are detachably connected 3 by bolts and nuts, and the outer peripheral edge is connected to the lining segment 2a of the lining tunnel A by bolts and nuts 4.

Further, a center bit 5 is provided in the center of the front surface of the central divided cutter plate piece 1b constituting the circular cutter plate 1 as in the case of a normal cutter plate, and an excavating bit is used as an edge piece around the center bit 5. Plural earth and sand intake slits 6 are provided. Further, a rotary shaft connecting fitting portion 7 is provided on the back surface of the center bit 5.

The circular cutter plate 1 thus constructed is
When the lining tunnel A is built, it is assembled as a part of the primary lining segment 2. That is, as shown in FIGS. 1 and 2, the shape of the lining segment 2a at the branch tunnel excavation position is formed into a shape capable of forming a circular hole portion into which the cutter plate 1 can be fitted by combining these lining segments 2a. Then, split cutter plate pieces 1a, 1b, 1c
Of the divided cutter plate piece after carrying in the lining segment 2a through the lining tunnel A to that position.
1a, 1b, 1c are sequentially assembled according to the excavation of the lining tunnel A.

After the circular cutter plate 1 has been assembled, as a back-filling injection, a circular shaped hole on the front side of the circular cutter plate 1 is injected with a filling material 8 such as poorly mixed concrete or the like and solidified to infiltrate groundwater. Prevent it. The filler 8 may be fixed to the front surface of the divided cutter plate pieces 1a, 1b, 1c in advance when they are manufactured.

In this way, the circular cutter plate 1 is preliminarily incorporated as a part of the lining segment 2 of the lining tunnel A, and when the branch tunnel B is constructed, the circular cutter plate 1 is substantially the same as the circular cutter plate 1 through the inside of the lining tunnel A. The skin plate 9 having a diameter, the components of the shield excavator such as the drive device 10, the bearing frame 11 and the like are carried in.

The skin plate 9 is divided into a front body side skin plate 9a and a rear body side skin plate 9b in which a partition wall 12 is integrally provided in the front end portion. First, the front body side skin plate 9a is shown in FIG. As shown in, the front end opening is placed on the abutment 18 with the front end facing the back surface of the circular cutter plate 1,
The drive device 10 is fixed to the back surface of the partition wall 12, the rotary shaft 13 thereof is penetrated through the central portion of the partition wall 12 and projected forward, and the propulsion jacks 14 are mounted at a plurality of positions in the skin plate,
In addition, the earth and sand intake chamber 15 formed between the cutter plate 1 and the partition wall 12
To the rear surface of the partition wall 12 and connect the sludge pipes 16 and 17.

Further, the bearing frame 11 is fixed to the inner surface of the lining tunnel so as to face the rear end of the front body side skin plate 9a. The drive device 10 and the propulsion jack 14 may be mounted on the front trunk side skin plate 9a in advance and then carried to the position of the cutter plate 1.

After assembling in this way, the bearing frame 11
The propulsion jack 14 is brought into contact with the spacer 19 via the spacer 19, and the front jack side skin plate 9a is advanced by extending the propulsion jack 14, and the rotary shaft 13 of the drive device 10 is attached to the fitting portion 7 of the circular cutter plate 1. Then, the shield excavator C is configured as shown in FIG. 4, and the outer periphery of the circular cutter plate 1 and the lining segment 2a are disconnected, and the outer periphery of the skin plate 9 is attached to the lining tunnel A. Attach the ring-shaped sealing material 20 that is in sliding contact with the surface.

After this state, the driving device 10 is driven to rotate the circular cutter plate 1 and the propulsion jack 14
Is gradually extended, the filler 8 covering the circular cutter plate 1 is excavated by the circular cutter plate 1, and then the ground in front of the filler 8 is excavated as shown in FIG.

Propulsion jack while adding spacers 19
When most of the front torso skin plate 9a penetrates into the ground due to the extension of 14, the spacer 19 is removed and the rear torso skin plate 9b is attached to the rear end side of the front torso skin plate 9a as shown in FIG. After arranging and as shown in FIG. 7, both are integrally connected and assembled to the skin plate 9 and an erector (not shown) is assembled in the rear torso side skin plate 9b. Assemble the lining segment 22.

In this case, if the front body side skin plate 9a and the rear side skin plate 9b are connected to each other by a direction correcting jack, and the rear skin plate 9b is replaced by the propulsion jack 14, the middle break shield excavator. Can be configured.

Thereafter, the lining segment 22 is supported by the bearing frame 11 while the lining segment 22 is being supported.
Abut the propulsion jack 14 on the front end face of the
The shield jack excavator C is propelled by pulling the propelling jack 14 by applying a reaction force to 22 and the branch tunnel B is excavated while rotating the cutter plate 1.

When a branch tunnel of a certain length is excavated,
A sealing material in which the lining segment 22 is assembled in the rear portion of the skin plate 9 and is provided around the inner peripheral surface of the rear end of the skin plate 9.
The sliding lining tunnel B having a desired length is constructed by sending the lining 21 to the side of the wall surface of the tunnel excavated in accordance with the tunnel excavation while repeating sliding contact with 21, and repeating this work.

The earth and sand excavated by the cutter plate 1 communicates with the earth and sand intake chamber 15 which is arranged so as to be replenished through the lining tunnel A through the branch tunnel B, as in the known muddy water shield method. It is discharged to the outside by the reflux water in the sending and discharging mud pipes 16 and 17.

[0024]

As described above, according to the present invention, since the rotary cutter plate of the shield excavator is divided into a plurality of parts for each width of the lining segment, it is easy to reach the excavation position of the branch tunnel through the lining tunnel. In addition to being able to carry into the above, it is possible to assemble the divided cutter plate pieces in a predetermined position of the lining tunnel where the branch tunnel is to be formed, in accordance with the segment of the lining tunnel, and to assemble them accurately into a circular cutter plate. .

In this way, inside the tunnel on the back side of the circular cutter plate incorporated in the lining segment, there is a partition wall inside, facing the cutter plate, and the drive device is arranged on the rear side of the partition wall. Since the rotating shaft rotated by the drive is connected to the center of the cutter plate and integrated with the above skin plate, the shield excavation can be efficiently performed even in the lining segment where the work area is relatively small. The machine can be assembled.

Thereafter, since the shield excavator is moved forward and the cutter plate is rotated to excavate the branch tunnel, the cross section of the shield excavator is assembled while assembling the segment on the excavation wall surface as in the usual shield construction method. It is possible to smoothly build a branch tunnel corresponding to the shape to a desired length.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view in which a cutter plate is incorporated as a part of a lining segment,

FIG. 2 is a rear view thereof,

FIG. 3 is a vertical cross-sectional side view in which each member of the shield excavator is installed on the back side of the cutter plate,

FIG. 4 is a vertical sectional side view immediately before excavation by the assembled shield excavator,

FIG. 5 is a longitudinal side view showing a state of excavation,

FIG. 6 is a vertical sectional side view showing a state in which a rear torso side skin plate is added,

FIG. 7 is a vertical sectional side view showing an excavated state,

FIG. 8 is a vertical sectional side view showing a construction state of a branch tunnel.

[Explanation of symbols]

 1 Circular cutter plate 1a to 1b Divided cutter plate piece 2 Lining segment 9 Skin plate 10 Drive device 13 Rotating shaft 14 Propulsion jack A Lining tunnel B Branch tunnel

Claims (2)

[Claims] 1. A circular cutter plate divided according to the width of a lining segment at the time of tunnel lining is incorporated into the lining at a tunnel branching position as a part of the lining segment, and when the tunnel diverges, the circular cutter plate is used in the tunnel. A skin plate having a partition wall inside and a drive unit disposed behind the partition wall is installed so as to face the rear surface of the cutter plate, and a rotary shaft rotated by the drive unit is connected to the center of the cutter plate to be integrated. A tunnel branching method by a shield excavator, characterized in that a shield excavator is assembled by assembling the shield excavator, and then the shield excavator is moved forward and a cutter plate is rotated to excavate a branch tunnel. 2. A shield excavator characterized in that a circular cutter plate is formed by detachably connecting a plurality of divided cutter plate pieces vertically divided for each width of a lining segment. Cutter board.