JP2544572B2 - Tunnel expansion method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tunnel expansion method for excavating a next tunnel in a state of communicating with one side of an existing tunnel after completion of excavation.

[0002]

2. Description of the Related Art In subway construction and sewer construction, small-diameter tunnels d, d communicating with a large-diameter tunnel D may be excavated as shown in FIG. 11, and a shield excavator is used for the excavation. There is.

[0003]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
If the small-diameter tunnels d and d communicating with the above are separated and separately excavated by a shield excavator, the construction cost increases. Further, if the next small diameter tunnel d is excavated while communicating with one side of the small diameter tunnel (existing tunnel) d after completion of excavation, the construction cost will be reduced, but when excavating the next small diameter tunnel d, There is a problem that the segment of the small-diameter tunnel (existing tunnel) d after the completion becomes an obstacle to the shield excavator for constructing the next small-diameter tunnel d.

The present invention has been proposed in view of the above problems, and an object thereof is to make an adjacent side portion of an existing tunnel and a tunnel under construction communicate with a segment of the existing tunnel without being disturbed. The point is to provide a tunnel expansion method that can

[0005]

In order to achieve the above object, the tunnel expansion method of the present invention, when excavating a next tunnel while communicating with one side of an existing tunnel after completion of excavation, While moving the shield excavator body forward, rotate the cutter head attached to the front end of the shield excavator body, press the cutter bit provided on the front surface of the cutter excavator body against the soil in front of the shield excavator body, and then If the shield excavator body encounters the communicating side segment part of the existing tunnel segment during the construction of this tunnel, the cutting blade protruding forward from the cutter bit is used to connect the existing tunnel communicating side segment. By pressing against the part and cutting the same segment, it is possible to connect the adjacent side part of the existing tunnel and the tunnel under construction. It is a symptom.

[0006]

The tunnel expanding method of the present invention allows the shield excavator body to move forward and to excavate the shield excavator body when excavating the next tunnel in a state of communicating with one side of the existing tunnel after completion of excavation as described above. Rotate the cutter head attached to the front end of the machine body, press the cutter bit provided on the front of the cutter head against the soil in front of the shield excavator body, excavate the next tunnel, and during the construction of this tunnel, When the shield excavator body encounters the communication side segment part of the existing tunnel segment, the cutting blade protruding forward from the cutter bit is pressed against the communication side segment part of the existing tunnel to cut the same segment part. By doing so, the adjacent side portions of the existing tunnel and the tunnel under construction are communicated.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a tunnel expansion method of the present invention and a shield excavator used for implementing the method will be described with reference to FIGS. 1 to 6. FIG. 1 to FIG.
1a is a segment of the existing tunnel 1 (reinforced concrete structure covering the side wall of the tunnel), 2 is the tunnel under construction next, 2a of FIG. 2 is a segment of the tunnel 2 under construction, 3 of FIG. 3 is of the existing tunnel 1 It is a middle pillar that is erected on the cutout portion of the segment 1a (see the parallel diagonal lines in FIGS. 1 and 2).

4 to 6 is a shield excavator body 5
Is a cutter head rotatably attached to the front part of the shield excavator body 4, 5a is a cutas pork portion of the cutter head 5, 5b is a cutter face face plate portion of the cutter head 5, and 6 is the shield excavator body 4 An earth removing device installed inside, a shield jack 7 provided on the shield excavator body 4, and a large number of cutting blades 11 fixed to the cutter face plate 5b of the cutter head 5 in a dispersed state (segments of the existing tunnel 1). Cutting blades), 12 are ordinary cutter bits (ground excavation blades = tunnel excavation blades) fixed in an aligned state to the cutas pork portion 5a.

Next, the tunnel expansion method using the shield excavator shown in FIGS. 4 to 6 will be specifically described.
When excavating the next tunnel 2 while communicating with one side of the existing tunnel 1 after completion of excavation, the shield excavator body 4 is moved forward and the cutter head attached to the front end portion of the shield excavator body 4 5 is rotated and the cutter bit 12 fixed to the front surface of the cutter head 5 is pressed against the soil in front of the shield excavator main body 4 to excavate the next tunnel 2, and during the construction of this tunnel 2, the shield excavator main body Four
When a segment on the communication side of the segment 1a of the existing tunnel 1 is encountered, the cutter bit 12 is fixed to the front face of the cutter head 5 of the shield excavator body 4 under construction.
By pressing the cutting blade 11 protruding further forward than the communication side segment portion of the existing tunnel 1 to cut the same segment portion (see the hatched portions in FIGS. 1 and 2 and FIG. 10), the existing tunnel 1 and the adjacent side portion of the tunnel 2 under construction are communicated with each other, and then the middle pillar 3 of FIG.

FIGS. 7 and 8 show another example of the cutting blade 11. 11b is a first group of sharp cutting blades, 11a is a second group of sharp cutting blades, 18 is a reaction plate at the rear of the cutter head 5, and 16 is one or a plurality of second group cutting blades 11a. A connecting plate for supporting the connecting plate 16 in a unit (in the case of two units in the figure), a jack 17 for supporting the connecting plate 16 on the reaction plate 18 so as to be able to move back and forth. The second group of cutting blades 1a is made to project from the tip of the cutter bit 12 to the face of the cutting face.

Next, the tunnel expansion method using the shield excavator shown in FIGS. 7 and 8 will be specifically described.
While advancing the shield excavator main body 4 and rotating the cutter head 5, the cutter bit 12 is pressed against the soil to excavate the next tunnel (tunnel under construction) 2.

When the segment 1a of the existing tunnel 1 is encountered, the jack 17 is operated in the extension direction to
The cutting blade 11a of the group is projected from the tip end of the cutter bit 2 to the face of the cutting face, and is pressed against the communication-side segment portion to cut the same segment portion, thereby cutting the existing tunnel 1 and the tunnel 2 under construction. Connect the adjacent side parts,
Next, the middle pillar 3 of FIG. 3 is erected on the cut portion of the segment 1a.

FIG. 9 shows still another embodiment in which the type of the cutting blade is changed to a rotary type. In this embodiment, the jack 17 is actuated to rotate the cutting blade 19a about a vertical central axis of rotation. , The tip of the cutting blade 19a is projected from the tip of the cutter bit 2 to the face of the blade, the shield excavator body 4 is moved forward, the cutter head 5 is rotated, and the cutting blade 19a is rotated (revolution). ) By the resistance when excavating soil and obstacles, the rotary cutting blade 19a
Is designed to rotate (rotate).

In the examples of FIGS. 5 and 6, each cutting blade 11 is fixed to the cutter face plate 5b of the cutter head 5, so that each cutting blade 11 is connected to the communicating side segment of the existing tunnel 1. In addition to cutting, tunnel 2 under construction
Although the ground is excavated, in the example of FIGS. 7, 8 and 9, each cutting blade 11 slides in the front-back direction,
Cuts only the communication-side segment of the existing tunnel 1.

[0015]

As described above, the tunnel expansion method of the present invention advances the shield excavator main body when excavating the next tunnel while communicating with one side of the existing tunnel after completion of the excavation as described above. At the same time, rotate the cutter head attached to the front end of the shield excavator body, press the cutter bit provided on the front face of the cutter head against the soil in front of the shield excavator body, and excavate the next tunnel, During the construction of this tunnel, if the shield excavator body encounters the communication side segment part of the existing tunnel segment, press the cutting blade projecting forward from the cutter bit to the communication side segment part of the existing tunnel, Since the same segment is cut, the adjacent side of the existing tunnel and the tunnel under construction can be connected without being obstructed by the segment of the existing tunnel. It can be.

[Brief description of drawings]

FIG. 1 is a plan view showing an excavation example of a tunnel expansion method according to the present invention.

FIG. 2 is a front view showing a cutout portion of a segment in the tunnel expansion method.

FIG. 3 is a front view showing a center pillar that is erected on the segment cutout portion.

FIG. 4 is a vertical sectional side view of a shield excavator used in the tunnel expansion method.

FIG. 5 is an enlarged side view showing a cutter head portion of the shield excavator.

FIG. 6 is a perspective view of the cutter head portion.

FIG. 7 is a vertical sectional side view showing another example of the shield excavator.

FIG. 8 is a perspective view of the shield excavator.

FIG. 9 is a vertical sectional side view showing still another example of the shield excavator.

FIG. 10 is an explanatory diagram showing a state in which the communication-side segment portion of the existing tunnel is being cut by the cutting blade of the shield excavator.

FIG. 11 is an explanatory diagram showing an example of excavation by a conventional shield excavator.

[Explanation of symbols]

 1 Existing Tunnel 1a Segment of Existing Tunnel 1 2 Tunnel under Construction 2a Segment of Tunnel 2 Under Construction 4 Shield Excavator Main Body 5 Cutter Head 11 Cutting Blade 12 Cutter Bit 19 Cutting Blade

Claims (1)

(57) [Claims] 1. A cutter attached to the front end of the shield excavator main body while advancing the shield excavator main body when excavating a next tunnel in a state of communicating with one side of an existing tunnel after completion of excavation. Rotate the head, press the cutter bit provided on the front of the cutter head against the soil in front of the shield excavator body to excavate the next tunnel, and during the construction of this tunnel, the shield excavator body is a segment of the existing tunnel. Of these, if you encounter the communication side segment part, press the cutting blade projecting forward from the cutter bit to the communication side segment part of the existing tunnel, and cut the same segment part so that the A tunnel expansion method characterized by connecting the adjacent side of the tunnel.