JPS6138095A - Enlarging drilling construction method - 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 (Industrial Application Field) The present invention provides a method for constructing a shield tunnel in an area scheduled for expansion on the outer periphery of an existing 7-road tunnel, in order to form, for example, a subway station premises or a sewer pipe connection. and an enlarged excavation method for excavating an eccentric enlarged tunnel.

(Prior art) Conventionally, this stock enlargement excavation method uses a double inner and outer cylindrical structure consisting of an inner cylinder a for guiding and an outer cylinder for shielding which are eccentric to each other, as shown in Figures 1 and 2. Expansion shield machine f75r equipped with a blade opening d on the front side in the propulsion direction of the shield machine main body C and a plurality of propulsion jacks e along the inner periphery of the outer cylinder: along the outer periphery of the existing shield tunnel g Generally, the outer periphery of the shield tunnel is excavated by propelling it in the axial direction.

(Problems to be Solved by the Invention) The conventional expansion excavation method uses an expansion shield machine f.
It is necessary to provide a space for installing the propulsion jack e and the cutting edge part d, or a space for discharging the excavated soil, between the inner cylinder a and the outer cylinder of the shield machine body C. Therefore, it is not possible to excavate an enlarged tunnel with a large eccentricity with respect to the existing shield tunnel GLC.

In order to solve the above-mentioned inconvenience, the present applicant has proposed in the patent application (1) filed at the same time that the area close to the outer cylinder of the cylinder of the conventional expanding shield machine is enlarged inwardly along the entire length along the axial direction. We proposed an expanding shield machine consisting of
It is desired to propose an efficient method for excavating expanded tunnels using a powerful expanding shield machine.

(Means for Solving the Problems) An object of the present invention is to provide an efficient enlarging excavation method that satisfies the above-mentioned requirements, and is aimed at providing an efficient method for enlarging excavation work to meet the above-mentioned needs. This is an enlarged excavation method for excavating an enlarged tunnel eccentrically.The shield machine has a double inner and outer cylindrical structure, which is composed of an eccentric guide cylinder and a shield outer cylinder, on the front side in the direction of propulsion. It is provided with a cutting edge part and a plurality of propulsion jacks along the inner periphery of the outer cylinder, and a region of the cylinder adjacent to the core outer cylinder is convexed inward along its entire length along its axial direction. In an expansion excavation method in which an expansion shield machine is propelled in the axial direction along the outer circumference of the shield tunnel to excavate the outer periphery of the shield tunnel, when constructing the existing shield tunnel, the convex part of the cylinder of the expansion shield machine is accommodated. This feature is characterized in that the portion where the expansion shield is removed is replaced with a segment and sealed with excavable filler material, and the filler material is excavated at the same time as the expanding shield machine is propelled.

(Embodiment) An embodiment of the enlarged excavation method of the present invention will be described below with reference to the accompanying drawings.

Is 1 in the figure an expanding shield machine used in the expanding excavation method of the present invention? The shield machine dividing unit 2f/ has a substantially fan-shaped cross section.
A plurality of pieces are assembled into a donut shape using zelts, etc., to form a double inner and outer cylindrical shield machine main body 5 consisting of an inner cylinder 3 for guiding and an outer cylinder 4 for shielding which are eccentric to each other. A blade part 6 of a set of fixed cutters is provided along the inner periphery of the side edge, and a propulsion jack 7 is provided for each of the divided units 2 behind the blade part 6, and the inner cylinder 3 and outer cylinder of the main body 5 are provided with a propelling jack 7. 4
The shield machine dividing unit 202 in the area where
The individual portions were made to convex inward so as to move away from the cylindrical side. Blade mouth part 6riInstead of the above-mentioned fixed cutter,
A rotary cutter, a muddy excavation device, or the like may be provided between the inner cylinder 3 and the outer cylinder 4 of the shield machine body 5.

8 in the figure indicates an existing shield tunnel, and when constructing the shield tunnel 8, an expansion area 9 in the central area of the shield tunnel 8 is planned.
In, the convex part 10 of the inner cylinder 3 of the expansion shield machine l
Instead of the segment 11, the portion corresponding to the segment 11 is filled and sealed with an excavable filler 12 such as poorly mixed mortar. In addition, a reinforcing member 14 is interposed between the segments 11 at both ends of the portion of the existing shield tunnel 8 to be filled with the filler material 12 by using brackets 13 provided in advance on each segment 11 at both ends. Part 13? The filler 12 is injected into the back side of the reinforcing member 14 through the penetrating filler injection pipe 15 fI:
,.

At one end of the area to be expanded 9 of the existing shield tunnel 8 constructed as described above, for example, a vertical shaft (not shown) may be excavated or an enlarged shield excavation method (4IiF-1989-21892 proposed earlier by the applicant) may be used. A starting base for the expanding shield machine 1 is formed by using the following method, and the expanding shield machine 1 is assembled and installed there.

Next, the expanding shield machine 1 is propelled along the outer periphery of the existing shield tunnel 8 in the axial direction by the propulsion jack 7 while taking the reaction force by a suitable reaction force receiver (not shown). At this time, the blade part 6 of the expanding shield machine 1 excavates the area 9 to be expanded on the outer periphery of the existing shield tunnel 8, and simultaneously excavates the filler 12 that seals the existing shield tunnel 8. These excavated soil and filler material 12 are transferred to the expansion shield machine 1.
It is discharged to the rear of the expanding shield machine 1 through the space formed between the inner cylinder 3 and the outer cylinder 4. Next, the segment 11 in the cylinder 3 of the expansion shield machine 10 is disassembled, and the segment for the expansion tunnel is assembled behind the expansion shield machine 1. The expansion shield machine 1 is further propelled by the propulsion jack 7 using the segment as a reaction force receiver. Existing shield tunnel 8
excavate the outer periphery of the This excavation work is repeated to form an enlarged tunnel eccentrically around the outer periphery of the existing shield tunnel 8.

(Effect of the invention) According to the present invention, when constructing an existing shield tunnel, the part corresponding to the convex part of the cylinder of the expanding shield machine is replaced with a segment and sealed with excavable filler material. The filling material is excavated at the same time as the expanding shield machine is propelled, so simply by propelling the expanding shield machine in the axial direction along the outer periphery of the existing shield tunnel, the cylindrical protrusion of the expanding shield machine excavates the filling material in the existing shield tunnel. The part filled with the material is continuously guided, and it has the effect of efficiently excavating an expansion tunnel that is relatively largely eccentric from the existing shield tunnel in the area to be expanded around the outer periphery of the existing shield tunnel.

In the embodiment described above, an example was shown in which the central region of the existing shield tunnel 8 is enlarged and excavated, but it goes without saying that a desired region such as one end region or the entire region of the existing shield tunnel 8 can be enlarged and excavated.

[Brief explanation of the drawing]

Figure 1 is a front view of the expansion shield machine used in the conventional expansion excavation method, propelling the outer circumference of an existing shield tunnel.
FIG. 2 is a sectional view taken along the line ■--■, and FIG. 3 is a partially cutaway perspective view showing the construction state of a tunnel used in the enlarged excavation method of the present invention. 1... Enlarged shield machine 3... Cylinder 4... Outer tube 5... Shield machine body 6... Blade mouth part 7... Propulsion jack 8... Existing shield tunnel 9... Enlargement Planned area 10... Convex portion 11... Segment 12... Filler patent applicant Mitsui Construction Co., Ltd., 7゛

Claims (1)

[Claims] This is an expansion excavation method for excavating an expansion tunnel eccentric to the existing shield tunnel in the planned expansion area on the outer periphery of the existing shield tunnel. The cylindrical shield machine body has a cutting edge on the front side in the propulsion direction, and a plurality of propulsion jacks are provided along the inner circumference of the outer cylinder, and the area of the inner cylinder close to the outer cylinder is defined by its axis. In an expansion excavation method in which the outer circumference of the shield tunnel is excavated by propelling an enlarged shield machine inward along the entire length along the outer circumference of the shield tunnel in the axial direction, At the time of construction, the part corresponding to the convex part of the cylinder of the expanding shield machine is replaced with a segment and sealed with excavable filler material, and the filler material is simultaneously excavated when the expanding shield machine is propelled. Expanded excavation method.