JPS6138094A - 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 (Field of Industrial Application) The present invention is directed to the construction of a shield tunnel in a planned expansion area on the outer periphery of an existing shield tunnel, for example, in order to form a subway station premises or a sewer pipe connection area. This invention relates to an enlarged excavation method for excavating eccentric enlarged tunnels.

(Prior art) Conventionally, this ultra-expansion excavation method uses a dual 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. A cutting edge III d is provided on the front side in the propulsion direction of the shield machine main body C, and a plurality of propulsion jacks e are provided along the inner periphery of the outer cylinder. Generally, the outer periphery of the shield tunnel is excavated by propelling it in the axial direction along the shield tunnel.

(Problems to be Solved by the Invention) The conventional enlarged excavation method uses two enlarged seals 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. In order to solve the above-mentioned problem, the present applicant has filed a concurrently filed patent application ( In 1), an enlarged seal II was proposed in which the area close to the outer cylinder of the inner cylinder of the two conventional enlarged seals was expanded inwardly along its entire length by six enlarged seals. A proposal for a method for excavating an expanded tunnel is desired.

Means for solving problem C) The purpose of the present invention is to provide an efficient expansion excavation method that satisfies the above-mentioned requirements. This is an enlarged excavation method for excavating eccentric enlarged tunnels, in which the shield machine has a dual inner and outer cylindrical structure consisting of an inner cylinder for guiding and an outer cylinder for shielding, which are eccentric to each other, on the front side in the direction of propulsion. The blade opening is transparent, and a plurality of propulsion jacks are installed along the inner periphery of the outer cylinder, and the area of the inner cylinder close to the core outer cylinder is convex inwardly along its entire length along the axial direction. In the expansion excavation method of excavating the outer periphery of the shield tunnel by propelling the expanded seal RIII in the axial direction along the outer periphery of the shield tunnel, when constructing the existing shield tunnel, the convex part of the inner cylinder of the expanded shield root is The segments of the area to be expanded corresponding to the above are connected to each other in the axial direction, and prior to the propulsion of the expanding shield machine, the connected segments are extracted from the shield tunnel in the axial direction and the inside of the two expanding seal machines is removed. It is characterized by forming a continuous region into which the convex portion of the cylinder fits.

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

In the figure, 1 shows the entire expansion shield machine used in the expansion excavation method of the present invention, in which a plurality of shield machine division units 2 each having a substantially fan-shaped cross section are assembled into a donut shape with bolts, etc., and a guide inner cylinder 3 eccentric to each other is assembled. A cylindrical shielding machine main body 5 with an inner and outer wall 21 is composed of an outer cylinder 4 for shielding, and a blade opening 6 of a set of fixed cutters is installed along the inner circumference of the edge of the main body 5 on the propulsion direction side.
', and a propulsion jack 7 is provided for each split unit 2 behind the blade opening 6, and the shield machine split unit 2 is provided in the region where the inner cylinder 3 and outer cylinder 4 of the main body 5 are close to each other.
2V! The A portion was made to convex inward to separate the inner cylinder side from the outer cylinder side. Instead of the fixed cutter, the blade mouth part 6 may be constructed so that a rotary cutter, muddy water excavation device, etc. is provided between the inner cylinder 3 and the outer cylinder 4 of the shield machine main body 5. 8 indicates an existing shield tunnel, and when constructing the shield tunnel 8, the area 9 to be expanded in its central area is
At this step, the segments 11 corresponding to the convex portions 10 of the inner cylinder 3 of the expansion shield machine 1 are connected to each other in the axial direction with bolts or the like, and these segments 11 are joined to other segments 12 constituting the existing shield tunnel 8 with a solder. I decided to keep it.

At one end of the planned expansion area 9 of the existing shield tunnel 8 constructed as described above, there is a thl (not shown) of a vertical shaft, for example.
A launching base for the two expanded seals 1 is formed by cutting or using the expanded shield excavation method previously proposed by the present applicant (Japanese Patent Laid-Open No. 59-21892), and then the existing shield tunnels 8 are axially aligned with each other. Junction of segment 11 connected to other segment 12 iyj? Remove the bolt etc. and unravel it.
Such a concatenated segment 11? While pulling them out in the direction of arrow A into the starting base,
The connections between them are removed by removing bolts, etc., and they are completely dismantled, and the inner cylinder 3 of the expansion shield machine 1 is installed in the existing shield tunnel 8.
The continuous region 13 into which the convex part 10 is inserted and propelled is a needle-shaped,
Ru.

Incidentally, between the segments 12 at both ends of the continuous area 130, brackets 1 are provided in advance for each segment 12Vc at both ends.
The existing shield tunnel 8 is reinforced by inserting a support 15 using the support 4 and filling the space between the support 15 and the segment 11 connected in the axial direction with a filling material 16 such as Nihamortar. And so.

Next, the expansion shield machine 1 is assembled and installed in the starting base, the convex part 9 of the inner cylinder 3 of the expansion shield machine 1 is fitted into the continuous area 13 of the existing shield tunnel 8, and a suitable countermeasure (not shown) is installed. The expanding shield machine 1yk is propelled in the axial direction along the outer periphery of the existing shield tunnel 8 by the propulsion jack 7 while absorbing the reaction force by receiving the force, and excavates the outer periphery of the existing shield tunnel 8. The excavated soil is discharged to the rear of the expanding shield machine 1 through a region formed between the inner cylinder 3 and the outer cylinder 4 of the expanding shield machine 1. Next, the remaining segments 12 in the inner cylinder 3 of the expanding shield machine 1 are dismantled, and the segment for the expanding tunnel is assembled behind the expanding shield machine 1.The segment receives the total reaction force and the propulsion jack 7 is used to expand the shield. The machine 1 is further propelled to excavate the outer periphery of the existing seal r tunnel 8.

Such excavation work is repeated to completely form an enlarged tunnel eccentrically around the outer periphery of the existing shield tunnel 8.

Although the above example shows an example in which the central area of the existing shield tunnel 8 is enlarged and milled by n+I, the existing shield tunnel 8 is
Needless to say, it is possible to excavate the entire desired area, such as one end area or the entire area.

(Effects of the Invention) According to the present invention, when constructing an existing shield tunnel, the segments 2 of the area to be expanded corresponding to the convex portion of the inner cylinder of the expanding shield machine are connected to each other in the axial direction, and Prior to propulsion of the expanding shield machine, the expansion is carried out to form a continuous region into which the convex portion of the inner cylinder of the expanding shield machine is inserted by extracting the connected segments axially from the shield tunnel. The area into which the convex part of the inner cylinder of the shield machine fits can be easily formed, and the continuous area thus formed can be expanded and the convex part of the inner cylinder of the shield machine can be inserted to continuously propel the existing shield tunnel. This seal has the effect of efficiently excavating an enlarged tunnel that is relatively largely eccentric from the seal r tunnel.

[Brief explanation of the drawing]

Figure 1 is a front view of the expansion shield machine used in the conventional expansion excavation method in the external 1ii1 full propulsion state of the existing shield tunnel, Figure 2 is its sectional view along the ■-■ line, and Figure 3 is an enlarged version of the present invention. A front view of the existing seal of the expanding shield machine used in the excavation method and the propulsion state of the outer circumference of the tunnel.
A cross-sectional view taken along the line -■, and FIG. 5 is a perspective view showing a state in which a segment of the existing shield tunnel is removed. 1... Enlarged shield machine 3... Inner cylinder 4... Outer cylinder 5... Seal 2 machine body 6... Blade mouth part 7... Propulsion jack 8... Existing shield tunnel 9... Enlargement Planned area 10...Convex part ll/
...Segment 13...2 people outside the continuous area -
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Claims (1)

[Claims] This is an expansion excavation method for excavating an expansion tunnel that is eccentric to the shield tunnel in the planned expansion area on the outer periphery of an existing shield tunnel. A heavy cylindrical shield machine body has a cutting edge on the front side in the direction of propulsion, and a plurality of propulsion jacks are provided along the inner circumference of the outer cylinder, and the area of the inner cylinder near the outer cylinder is In an expansion excavation method in which the outer periphery of the shield tunnel is excavated by driving an expanding shield machine that is convex inward along the entire length of the shield tunnel in the axial direction along the outer periphery of the shield tunnel, the existing shield tunnel When constructing the expansion shield machine, segments of the area to be expanded corresponding to the convex portion of the inner cylinder of the expansion shield machine are connected to each other in the axial direction, and prior to propulsion of the expansion shield machine, these connected segments are connected to the shield. An expansion excavation method characterized by forming a continuous region into which a convex portion of an inner cylinder of the expansion shield machine is inserted by extracting it from the tunnel in the axial direction.