JP3133662B2 - Construction method of large section underground cavity - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

The present invention relates to a method for constructing a large section underground cavity.

[0002]

2. Description of the Related Art Conventionally, the following method has been employed for the construction of a horizontally long underground cavity having a large cross section. (1) Open-cutting method After digging by open-cutting method and constructing the main structure, backfill is performed. (2) Large-diameter shield construction method Excavation and lining are performed using a large-diameter shield excavator. (3) Pipe roof method After supporting the mountain retaining by the pipe roof method, the inside is excavated,
Build the main structure.

[0003]

However, such construction methods have the following problems. (1) In the excavation method, a large site is required on the ground, and it is difficult to perform construction in an overcrowded city. (2) In the large-diameter shield method, it is difficult to stably control the face, and the cross-sectional shape cannot be changed in a circular uniform cross section. (3) In the pipe roof method, there was a limit on the length of work that could be performed.

SUMMARY OF THE INVENTION An object of the present invention is to form a horizontally long underground cavity having a large cross section without the above-mentioned problem. It is an object of the present invention to provide a method for constructing a new large-scale underground cavity which can be constructed and has no restriction on the extension of construction.

[0005]

According to the construction method of the present invention, a plurality of shield tunnels are connected and constructed simultaneously by a multiple section shield excavator having a plurality of continuous sections, and this is repeated to surround a plurality of shield tunnels. Construct a large section of shell lining. The change in the cross-sectional shape is dealt with by turning the double-section shield excavator to widen or reduce the outer lining. After that, the inside of the shell is constructed by excavating the inside of the shell while supporting the shell lining with an open excavator, and assembling the segments at the rear of the shell. In this case, the outer size of the skin plate of the large open excavator is slid and adjusted to cope with the widening or reduction of the outer lining.

[0006]

Next, embodiments of the present invention will be described in detail with reference to the drawings. 1 and 2 show an outline of an example. In this example, as a multi-section shield excavator, two (or three) shield machines are connected so as to be able to change the directivity direction, as described in Japanese Patent Publication No. 4-11718, for example. The cross-sectional shape is spiral from two horizontal (or three horizontal) to two vertical (or three vertical), and conversely, from two vertical (or three vertical) to two horizontal (or three vertical) Use a structure that can be freely changed continuously. FIG. 1 shows a double shield machine 1 having such a structure.
A and the triple shield machine 1B are both used. The shield machine used is not limited to the one having such a structure.

In FIG. 1, two vertical shafts 2.3 are provided.
From one of the shafts 2 (or 3), the small-diameter twin shield machine 1A or triple shield machine 1B is started and excavated toward the other shaft 3 (or 2). 2 shield tunnels or 3 shield tunnels 4 will be constructed. The construction can be performed in parallel by simultaneously excavating a plurality of double shield excavators 1A or triple shield excavators 1B. In areas where segments are not connected, ground improvement for water stoppage will be made from inside the tunnel by chemical injection. The ground between the shield tunnels 4 and its surroundings is also improved as needed. When the shaft 3 (or 2) on the opposite side is reached, the U-turn is repeated and the same construction is repeated, and the outer lining (temporary lining) 5 of a large section surrounded by a large number of small-diameter shield tunnels 4 is erected. -Build between three. At this time, the inside of the shell lining 5 has not been excavated yet. 3 shows a case where the outer lining 5 has a rectangular cross section, and FIG. 4 shows a case where the outer lining 5 has a circular cross section. It is preferable to excavate the triple shield excavator 1 </ b> B in an L-shaped bent posture for the construction of the corner portion of the outer lining having the rectangular cross section.

When the cross section of the outer lining 5 is to be widened or reduced, the double shield excavator 1A or the triple shield excavator 1B is connected to a method as described in Japanese Patent Publication No. 4-11718. To turn. FIG. 5 shows an example in which two double shield excavators 1A are widened by turning the whole to a horizontal posture from an inclined posture where the excavation is performed obliquely with respect to a horizontal line.

FIGS. 6 to 8 show an example in which the outer lining 5 having a rectangular cross section is widened. The construction mode of FIG. 6 is that, for most of the left and right side panels 5a and 5b of the shell lining 5 having a rectangular cross section, the double shield excavation machine 1A and the triple shield excavation machine 1B are in a vertical posture, It is in a state where the construction is performed in a horizontal posture, and most of the roof part 5c and the bottom part 5d of the shell lining 5 are similarly constructed in a vertical posture, and part of the construction is performed in a horizontal posture. The construction mode of FIG. 7 is the shield excavator 1A in FIG.
Alternatively, 1B is turned to an inclined posture, and the outer shell lining 5 is widened to the left, right, up and down. FIG. 8 shows a state in which the left and right side panels 5a and 5b of the outer lining 5 are all set to the vertical position, and the top plate 5c and the bottom panel 5d are all set to the horizontal position and the widening is completed.

[0010] As described above, the outer lining 5 having a large rectangular section
After assembling, in the shaft 2 or 3, a large open rectangular excavator 6 having a size equivalent to the cross section of the outer lining 5 is assembled,
The mobile machine frame 7 excavates the inside while supporting the shell lining 5. The mobile machine frame 7 of the large open excavator 6
A building structure having a plurality of floors as shown in FIG. 9 is provided. In each floor and each room 8, the inside of the outer lining 5 can be simultaneously excavated by a free-section excavating machine 9 such as a road header, a boom header, and a cutter loader. Is good. In the tail part at the rear part of the moving machine frame 7, a lining segment 10 such as a steel frame segment is assembled along the inner periphery of the outer lining 5, and concrete is cast by the concrete casting machine 11, and the moving machine frame 7 is formed.
In the further backward direction, the mobile machine frame 7 is advanced by the propulsion jack 12 as the excavation proceeds, while unloading the excavated soil. By casting the concrete, a frame 13 having a rectangular cross section that is double-walled with the shell lining 5 is constructed by making the inside of the shell lining 5 into a large-section cavity (FIG. 3). In the case where the outer lining 5 has a circular cross section as shown in FIG. 4, if the skeleton 13 is rectangular, the outer lining 5 becomes a circumscribed circle.
Needless to say, a circular cross section along the line can be formed.

The mobile machine frame 7 of the large open excavator 6 has skin plates 14, 15, 16.
A slide plate 18 is provided between the plates 7 so that the size of each room 8 and the entire outer size can be freely expanded and reduced by sliding between the plates.
At the section where the cross section of the outer lining 5 is widened, the width is widened as shown in FIG. 9B from the reduced state as shown in FIG. By using such a large-sized open excavator 6, labor saving and high-speed operation can be achieved, and the support span of the shield tunnel 4 can be shortened.

[0012]

As described above, according to the present invention, the following effects can be obtained. After constructing a large section of shell lining surrounded by a large number of shield tunnels, the open excavator is used to excavate the inside of the large section, and efficient and efficient drilling of the large section and building of the frame are performed in a dry state. It can be done economically.
Since the shell lining is performed using a small-diameter shield excavator, the size of the shaft can be reduced even if the completed cavity has a large cross section. Since the multi-section shield excavator is turned to widen or reduce the outer lining, the outer lining can be easily widened or reduced only by excavating the multi-section shield excavator.
Regarding the outer shell lining, a plurality of shield tunnels are simultaneously connected with a double or triple double-section shield excavator, so that ground improvement between tunnels can be reduced. By using a combination of a multi-section shield excavator and an open excavator, it is possible to greatly shorten the construction period, save labor and streamline large-scale underground cavities. Since excavation is performed while supporting the outer lining, which is also a temporary lining, with an open excavator, it is possible to reduce the frame size by using the inner space for facilities and the like.

[Brief description of the drawings]

FIG. 1 is a construction procedure diagram showing a process of constructing a shell lining by a construction method according to the present invention.

FIG. 2 is a construction procedure diagram showing a process of excavating the inside of a shell lining.

FIG. 3 is a cross-sectional view when the shell lining has a rectangular cross section.

FIG. 4 is a cross-sectional view when the shell lining has a circular cross section.

FIG. 5 is an explanatory view showing an example in which the outer lining is widened by turning the double shield excavator from an inclined posture to a horizontal posture.

FIG. 6 is a cross-sectional view showing a state before the outer lining having a rectangular cross section is widened.

FIG. 7 is a cross-sectional view showing a state during widening.

FIG. 8 is a cross-sectional view of a state after the width has been widened.

9A and 9B are explanatory diagrams illustrating that a skin plate of a large open excavator is slid to enlarge each room and the shell size, and FIG. 9A shows a state before the widening and FIG. 9B shows a state after the widening.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1A Double shield excavator 1B Triple shield excavator 2.3 Vertical shaft 4 Shield tunnel 5 External lining 6 Large open excavator 7 Mobile machine frame 10 Segment 13 Body 14.15.16.17 Skin plate 18 Slide plate

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hiroshi Nakura 2-5-8 Kitaaoyama, Minato-ku, Tokyo Co., Ltd. (72) Inventor Hideaki Tanaka 2-58-8 Kitaaoyama, Minato-ku, Tokyo Co., Ltd. (56) References JP-A-2-144499 (JP, A) JP-A-5-280297 (JP, A) JP-A-1-278696 (JP, A) JP-A-2-108798 (JP, A) JP-A-7-11893 (JP, A) JP-A-7-208068 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) E02D 29/045-29/055 E21D 13/00 -13/04

Claims (2)

(57) [Claims] A step of simultaneously connecting and constructing a plurality of shield tunnels with a multi-section shield excavator to form an outer lining; and a step of turning the multi-section shield excavator to widen or reduce the outer lining. The process of constructing a large section outer lining surrounded by a number of shield tunnels by repeating the above steps, the step of excavating the inside of this outer lining, and the step of building a skeleton inside the outer lining How to construct a large underground cavity. 2. The excavation inside the shell lining is performed while supporting the shell lining with an open excavator. The skeleton is constructed by assembling segments at the rear of the open digger, and the width of the shell lining is increased or The method for constructing a large-section underground cavity according to claim 1, wherein the shrinkage is adjusted by slidingly adjusting the outer size of the skin plate of the open excavator.