JPS6138093A - Enlarging shield machine - 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 an eccentric construction of an existing shield tunnel in an area to be expanded on the outer periphery of an existing shield tunnel, in order to form, for example, a subway station premises or a sewer pipe connection part. This invention relates to an expanding shield machine for excavating expanded tunnels.

(Prior Art) Conventionally, as shown in FIGS. 1 and 2, this type of expanding shield machine has a guiding inner IBb and a shielding inner IBb eccentric to each other, which are propelled in the axial direction along the outer periphery of an existing shield tunnel a. A cylindrical shield machine body d with an inner and outer diameter of -Φ, which is composed of an outer cylinder C, is provided with a cutting edge part e on the front side of the propulsion surface, and a plurality of propulsion Jireckis f are provided along the inner periphery of the outer cylinder C. -
・General.

(Problems to be Solved by the Invention) The conventional expanding shield machine has a 1131L jack f... and a blade part between the guide inner cylinder C of the shield machine main body d and the shield outer cylinder C. Since it is necessary to provide an installation space e or a discharge space for excavated soil, it is not possible to bring the inner cylinder and the outer cylinder C very close to each other. It has the disadvantage of being limited in quantity.

(Means for Solving the Problems) The present invention eliminates the disadvantages of the conventional expanding shield machine, minimizes the amount of eccentricity between the inner cylinder and the outer cylinder of the shield machine main body, and thus reduces the eccentricity with respect to the existing shield tunnel. The purpose is to provide an expansion shield machine capable of excavating a large-volume expansion tunnel. On the front side in the propulsion direction of the shield machine body, which has a dual inner and outer cylindrical shape, is composed of an inner cylinder for guiding and an outer cylinder for shielding, which are eccentric to each other and are propelled in the axial direction along the outer periphery of the shield tunnel. In an enlarged shield machine that includes a blade opening and a plurality of propulsion jacks along the inner periphery of the outer cylinder, a region of the inner cylinder of the shield machine body that is close to the outer cylinder is expanded along the axial direction of the shield machine body. It is characterized by the fact that it takes on the entire length of T-C and extends 5 points on the inside.

(Embodiment) An embodiment of the enlarged shield 1 of the present invention will be described below according to the attached drawings.

In the figure, reference numeral 1 shows the main body of the shield machine, in which a plurality of shield machine division units 2 each having a substantially fan-shaped cross section are assembled in a dope shape using bolts, etc., and an inner cylinder 4 for guiding which is eccentric to each other and an outer cylinder 4 for shielding. It has a double inner and outer cylindrical shape, and a blade part 5 of a set of fixed cutters is provided along the inner periphery of the edge on the propulsion direction side of the outer cylinder 4 of the shield machine main body 1. ! The propulsion jets 1 and 6 are installed in each of the divided units 2. Although this configuration is not particularly different from the conventional one, it has been modified according to the features and aspects of the present invention. The area of the inner cylinder 3 of the shield machine main body 1 close to the outer cylinder 4 is made inward along its entire length along the axial direction, and the convex part 7 is formed, for example, in some of the segments 1-9 of the existing shield tunnel 8. In the illustrated example, two parts of the shield machine divided unit 2 in the area where the inner cylinder 3 and the outer cylinder 4 of the shield machine main body 1 are close to each other are propelled. The inner cylinder side was whitened on the inside so that it was separated from the outer cylinder side.

Therefore, even if the eccentricity between the inner cylinder 3 and the outer cylinder 4 of the shield machine main body 1 is increased, the distance between the inner cylinder 3 and the outer cylinder 4 in the area where the inner cylinder 3 and the outer cylinder 4 are close to each other is A relatively large space is taken up, the propulsion jack 6 can be installed there, and there is also enough space for discharging excavated soil. Moreover, the expanding shield machine of the present invention can be easily assembled by simply replacing a portion of the shield machine dividing unit that constitutes the shield machine main body of the conventional expanding shield machine.

Instead of the fixed cutter described above, the blade mouth portion 5 may be configured such that a rotary cutter, a muddy excavation device, or the like is provided between the inner cylinder 3 and the outer cylinder 4 of the shield machine main body 1.

Next, a method for excavating an enlarged tunnel using the enlarged shield machine of the present invention will be explained.

First, although not shown, at one end of the planned expansion area 11 of the existing shield tunnel 8, for example, a vertical shaft may be excavated or the enlarged shield excavation method previously proposed by the present applicant (Japanese Unexamined Patent Application Publication No. 59-119)
21892), a starting base for the expanding shield machine is formed, and the expanding shield machine of the present invention is assembled and installed there.

Next, the segment 9 forming the existing shield tunnel 8
Among them, one segment 9 corresponding to the convex part 7 of the inner cylinder 3 of the expanding shield machine is removed, and the convex part 7 of the inner cylinder 3 of the expanding shield machine is placed in the space 10 to be formed after the removal.
is inserted, and the expansion shield machine is propelled by the propulsion jack 6 to excavate the outer periphery of the existing shield tunnel 8 while taking the reaction force by a suitable reaction force receiver (not shown). The excavated soil is discharged to the rear of the expanding shield machine through a space formed between the inner cylinder 3 and the outer cylinder 4 of the expanding shield machine. Next, the remaining segments 9 in the inner cylinder 3 of the expansion shield machine are disassembled, one segment 9 in front of the convex part 7 of the inner cylinder 3 is removed, and a segment for the expansion tunnel is installed at the rear of the expansion shield machine. are assembled, and the expanding shield machine is further propelled by the propulsion jack 6 using the segments as reaction force receivers to excavate the outer periphery of the existing shield tunnel 8.

By repeating this excavation work, the existing shield tunnels I to 8
An enlarged tunnel eccentrically formed on the outer periphery of the tunnel is formed.

In addition, legmen 1 for removing the existing shield tunnel 8
9 is an outer wall 12 and a reinforcing frame 13 inside thereof, as shown in the sixth figure.
The structure is relatively simpler than that of a normal segment.

In addition, reinforcing members 15 are interposed between the segments 9 at both ends of the space 10 formed after the segments 9 are removed, using bracts 14 previously provided in each segment 9 at both ends. The space between the reinforcing member 15 and the removal segment 9 is filled with a filler 17 such as mortar through a filler injection pipe 16 passing through the reinforcing member 15 to reinforce the existing shield tunnel 8.

(Effects of the Invention) According to the present invention, since the area of the inner cylinder of the shield machine main body close to the outer cylinder is whitened inward over the entire length along the axial direction, the outer cylinder of the shield machine main body is whitened. In the region where the cylinders are close to each other, a relatively large space can be taken between the inner cylinder and the outer cylinder. The effect of drilling around the outer periphery is right.

[Brief explanation of the drawing]

Figure 1 is a front view of a conventional expanding shield machine that is propelling the outer circumference of an existing shield tunnel, Figure 2 is a cross-sectional view along the FIG. 4 is a front view of one embodiment of the invention enlarged shield machine, FIG. 4 is a sectional view taken along line IV-■, FIG. 5 is a perspective view of an existing shield tunnel, and FIG. 6 is a perspective view of a segment for removing the existing shield tunnel. be. 1... Shield machine main body 3... Inner cylinder 4... Outer 1n 5... Blade [ ] part 6... nt-adjustable screw 8... Existing shield tunnel 9... Legmen 1~ 10...Space 11...Expansion planned area

Claims (1)

[Claims] This is an expansion shield machine for excavating an expansion tunnel eccentric to the shield tunnel in a planned expansion area on the outer periphery of an existing shield tunnel. The main body of the shielding machine has a dual inner and outer cylindrical shape, which is composed of a cylinder and an outer cylinder for shielding, and has a blade opening on the front side in the direction of propulsion, and a plurality of propulsion jacks along the inner circumference of the outer cylinder. 1. An enlarged shield machine, characterized in that a region of the inner cylinder of the shield main body adjacent to the outer cylinder is convex inward along its entire length along its axial direction.