JPS6088790A - Enlarging shield 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 (Technical Field) The present invention relates to an enlarged shield construction method that improves construction efficiency.

(Prior art) As shown in Fig. 1, the previously proposed enlarged shield construction method expands a part of the partial shield segment 2 (referred to as the next segment 2) forming the normal diameter tunnel 1. It is removed, an annular cavity 3 is excavated in that location, and the cavity 3 is removed.
The expansion shield machine 4 is assembled inside the tunnel, and the expansion shield machine 4 is partially excavated around the segment 2 and along the area to be expanded 5 to excavate an expansion tunnel. In addition, the said expansion shield machine 4 is a digging blade 4a, - next segment), etc.
A sole 6 that slides on the outer periphery of No. 2 and a thrusting jack 7 are provided, and as the expansion excavation progresses, No. 1 (some segments within the planned expansion area 5) 2a are successively removed.

Additionally, the M-marked cavity 3 serves as a starting base for the expanding shield machine 4, and a circumferential shield construction method has already been proposed for forming the cavity 3. To explain this construction method based on Figures 2 to 9, first, as shown in Figures 2 to 3, a hole is dug in a part of the second seventh segment 2, and a hole with a U-shaped cross section is dug in the hole. Load the circumferential shield machine 1 () and move it circumferentially along the guide link 11 to reach the cavity 3.
This will be explained in more detail based on FIGS. 4 to 9. As shown in FIGS. Set up mathematics. At this time, a jack 13 is used as shown in FIG. Next, as shown in Fig. 6, the soil inside the box 12 was removed, the circumferential shield machine 10 was installed inside the box 1, and one wall of the box 2 was removed using the main push jack J4. Push the circumferential knoll machine 10 to the side; behind the ILJ Zel 11 circumferential knoll machine JO, PI! ; 7-8
As shown in the figure, a circumferential segment 15 having a similar shape
These are successively connected with bolts, etc., and the excavation of the cavity 3 is continued.

Finally, a cavity ii+13 is formed which is completely covered with the J-shaped circumferential segment 15 shown in FIG. Of course, one side plate (mounted &) of each of the circumferential segments 5 is removed.

When the above-mentioned expansion shield construction method and circumferential solder construction method are used, construction work to expand at least a portion of an existing tunnel becomes extremely efficient.

(Objective of the Invention) An object of the present invention is to provide an enlarged shielding method that can make the above-mentioned enlarged tunnel excavation more efficient.

(Summary of the Invention) The present invention provides a method for forming an annular cavity in a part of a normal diameter tunnel using a circumferential shield machine and multi-divided enlarged shield beads that are successively connected integrally on the rear side of the circumferential shield machine, and then The concerned j
An expanding shield machine is formed mainly using the vast shield machine piece, and the expansion direction of the tunnel (-
The main idea is to form an enlarged tunnel by excavating in the direction in which the next segment extends.

(Example) Hereinafter, the present invention 1 will be explained based on an example shown in FIGS. 10 to 12. Namaru-1 The same symbols are used for the same parts as before.

The circumferential shielding machine 10 used in the present invention is similar to that of the conventional construction method, and as shown in FIG. J) 24e is formed, and a circumferential copropulsion jack 27 is provided as a device 1iii. Also, the expansion shield machine piece 2 () has a pair of fan-shaped copper ridges U'21 and 22 arranged spaced apart from each other in the same state, and a wide width of these copper phases. The outer circumferential plate 23 connecting the +li portions 2ia and 22a is separated. One of the steel plates 21 for retaining the threads is attached to the outer circumferential plate 23 via a desired frame 25, and is removably attached to the old frame 25. 9A) 122 for the other mountain retainer
2 has a length of 14M, the whole of which is removable from the outer peripheral plate 23.
(τJ kera) 1. 3. The outer circumferential plate 23 has an enlarged digging blade (blade mouth) 26 on the edge side where the frame 25 is cut (-1), and the outer circumferential plate 23 has an enlarged cutting blade (blade mouth) 26 on the inner surface thereof.
It is possible to increase the number of extension direction propulsion jacks 28 by 4=1.

The expansion shield machine piece 20 is configured to be able to connect a large number of divided expansion shield machine pieces having the same shape, and therefore a connecting plate 29 having a bolt hole for connection and a cushioning material thereof. Equipped with 30,
Also, the outer circumferential plate 23 and the steel material 22 are provided with a cushion 31.
It is equipped with

Next, the present invention will be explained in detail while explaining the operation of the above-described magnifying shield machine piece 20.

2. The circumferential shield machine 10, similar to the previously proposed one, is installed in a hole dug by removing a part of the second segment 2, and is excavated by the circumferential propulsion jack 27 to form the cavity 3. . At this time, on the rear side of the circumferential shield machine 10, a similar shaped (enlarged shield machine piece) 20 is placed!・ etc. are used to sequentially connect them together. , this enlarged shield machine piece 20 and the conventional circumferential segment 15
The main difference lies in the inclusion of a propulsion jack 28 and an enlarged digging blade (blade D) 26 for the extension direction of some segments.

After the cavity 3 is completely hollowed out, remove the circumferential shield machine 2o, the copper 4g'21 and 22'ee for retaining the threads of each circumferential segment, and remove desired parts such as tellurium and tail soles (not shown). After forming the expansion shield machine 2OA by taking up
Using the propulsion jack 28, a part of the excavation is carried out in the extending direction of the segment 2, and an enlarged tunnel is formed in the area 5 to be enlarged.

The enlarged shield machine piece 2o is assembled in an annular shape and supports the inner wall of the cavity 3, similar to the previously proposed circumferential segment shown in FIG. 9, but at least some of the enlarged 7 shield machine pieces 2o The MF advance jack 28 is attached in advance to L1'J. .

In addition, the circumferential shield No. 611 (*10 is the cavity 3 is completely θ
After that, it is usually replaced with the same 4) ゛p-shaped expanding shield machine piece 20, but as described in niJ, the circumferential shield machine 10 main body can be used as a part of the expanding shield machine 2OA. It's okay.

Furthermore, as shown in FIG. 10, when the expanding shield machine 2OA excavates, two secondary segments are assembled in advance in an annular shape on the inner periphery so that they can support the inner surface of the cavity 3. .

(Effects of the Invention) As described above, according to the present invention, after forming a starting base for an expanding shield machine in an area where a tunnel is to be expanded using a circumferential shield machine and an expanding shield machine piece, the expanding shield machine piece is Since the expansion tunnel is excavated by the expansion shield machine, the construction is extremely efficient compared to the method of using the circumferential segment and the expansion shield machine separately. It becomes possible to do so.

[Brief explanation of the drawing]

Figure 1 is a schematic F4 Norm plane view showing the previously proposed enlarged/lowered construction method, Figure 2 is a schematic cross section showing the previously proposed circumferential shield machine...Figure 1, Figure 3 is the 1 of Figure 2. ``An enlarged view of the line range, Figures 4 to 9 are schematic process diagrams showing the previously proposed circumferential shielding method, Figure 10 is a schematic sectional view showing an example of the method of the present invention,
FIG. 11 is a sectional side view of a circumferential shield machine used in the uninvented expanding shield construction method, and FIG. 12 is a perspective view showing details of the same expanding shield machine piece. 1...Normal diameter tunnel 2...Next shield segment 3...Cavity 4...Expansion shield machine 5...Expansion planned area 20...Circumferential shield machine 21.22...
Copper for mountain retaining 4: A' 23・Outer plate 24・・Circumferential drilling blade (Blade I+) 25・・Frame 26・Enlarged drilling blade (
Blade mouth) 27...Circumferential simultaneous propulsion jack 28...Lateral JIU propulsion jack 29...Connection plate 30.31...
・Kutsunyon kidnapping. Patent Applicant: Mitsui T. Co., Ltd. Figure 3 Figure 4 Figure 5 Figure 6 Figure 7

Claims (2)

[Claims] (1) Remove a part of the already installed tunnel segment, and install a circumferential shield machine and a multi-segmented enlarged shield that is sequentially connected to the rear side of the circumferential shield machine and the part where the entire next segment was removed. After forming an annular 'l'p 1.1 covered with the expanding shield machine piece using the machine piece, expand/
An enlarged shield drilling method, characterized in that the enlarged shield machine is excavated in the extending direction of the next segment to form an enlarged tunnel. (2) The enlarged Nordwe method according to claim 1, wherein the front t() enlarged shield machine piece is provided with a cutting edge and a propulsion jack necessary for forming the enlarged shield machine in advance. ,.