JPH1193600A - Construction method for underground structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make easy to construct a structure by installing divided multiple segments along the inner perimeter of a tunnel formed by advancing a shield machine installed underground. SOLUTION: Divided holes 63a, 63b, 64a, 64b, 65a, 65b, 66a, 66b, 67a, 67b, 68a, 68b, each corresponding to any of multiple segments 53a, 53b, 54a, 54b, 55a, 55b, 56a, 56b, 57a, 57b, 58a, 58b on the border line of a tunnel 52 to be excavated are excavated, leaving inside earth. The segments 53a, 53b, 54a, 54b, 55a, 55b, 56a, 56b, 57a, 57b, 58a, 58b are incorporated into the divided holes. Thus a structure 50 is assembled by providing all the segments along the entire profile of the tunnel 52 to be excavated and a tunnel is formed by removing earth surrounded by the structure. Therefore, a large and complex form structure like a subway station can be built easily.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing an underground structure, in particular, a hollow structure.

[0002]

2. Description of the Related Art Conventionally, for a box-shaped underground structure for forming a subway station or the like, for example, an open cut method for excavating from the ground is known.

[0003]

However, the conventional open cut method, when constructed in a downtown area or the like, has problems such as traffic congestion and the occurrence of pollution due to noise and dust. There is a disadvantage that there is no. In addition, protection of underground objects such as power lines and gas supply pipes must be considered. In addition, excavation and backfilling beyond the necessary range for construction must be performed, which is problematic in terms of cost.

[0004]

SUMMARY OF THE INVENTION The present invention provides a method of constructing an underground structure which solves the above-mentioned problems. According to the present invention, a shield excavator installed in soil is advanced by moving it forward. The underground structure is constructed by laying a plurality of segments divided along the inner peripheral wall of the excavated horizontal hole, so it solves all the problems seen in the conventional open cut method be able to.

[0005] When constructing an underground structure such as a subway station, it is extremely difficult to excavate large-scale and complicated-shaped side holes at once using a shield excavator. There is a danger of collapse. Regarding this point, according to the present invention, a divided hole corresponding to any one of the plurality of segments is excavated on the outline of the horizontal hole to be excavated while the soil remains, and the segment is incorporated into the divided hole. By constructing the division work and performing such division work at the same time or before and after, the structure is assembled by laying all the segments around the entire circumference of the contour of the horizontal hole scheduled to be excavated, A large-scale structure having a complicated shape can be easily constructed. In addition, since each divided hole is excavated, there is no danger of earth and sand collapse during excavation, and the operation can be performed safely.

[0006] Then, after a structure is constructed in the soil with all the segments, the inner soil surrounded by the structure is excavated and removed to complete the lateral hole, thereby completing the entire structure of the structure. Therefore, the excavated middle soil is surrounded by a so-called structure as a shell, so that the risk of landslide is small, and work can be performed safely in this respect as well.

Therefore, the present invention is configured as a first means to construct an underground structure by laying a plurality of segments divided along the inner peripheral wall of a lateral hole formed by excavation in the soil. In the method, while excavating a divided hole corresponding to any of the plurality of segments on the outline of the horizontal hole scheduled to be excavated while leaving the middle soil, a dividing operation step of incorporating the segment into the divided hole, An assembling step of assembling a structure by performing all the segments around the entire periphery of the side hole to be excavated by performing the division work step simultaneously or before and after; and a soil surrounded by the structure. Excavating and removing the hole to complete the side hole.

Further, the present invention is constituted as a second means, in a reinforcing step of forming a reinforcing structure such as a reinforcing column for reinforcing the structure simultaneously with the horizontal hole completing step or after the horizontal hole completing step. It consists in comprising.

[0009]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 shows an underground structure 50 constructed according to the method of the present invention. A plurality of segments divided along an inner peripheral wall of a lateral hole 52 excavated and formed inside a ground 51 are shown. It is assembled by installing. In the illustrated example, the segments are a pair of side wall segments 53a and 53b having the same cross section and a pair of upper wall segments 5 having the same cross section.
4a, 54b and a pair of bottom wall segments 55 having the same cross section
a, 55b and said pair of upper wall segments 54a, 54
b and a pair of bottom wall segments 55a and 55b, respectively, and a pair of substantially symmetrical central wall segments 56a and 56b and upper wall segments 54a and 54b.
And a pair of symmetrical upper corner segments 57a, 57b disposed at a corner portion between each of the side walls 53a, 53b, and bottom walls 55a, 55b.
And a pair of symmetrical lower corner segments 58a, 58b disposed at the corners between the side wall segments 53a, 53b, respectively, to form a total of 12 segments. The number and shape of the segments may be appropriately changed according to the scale and shape of the structure to be constructed. These segments may be made of reinforced concrete or steel, and the material and shape can be selected according to the purpose.

In the illustrated embodiment, the structure 50 is provided with a reinforcing structure 60 such as a reinforcing column 59, and may be provided with a steel frame or other various reinforcing means.

Structure 50 by assembling the segments
When constructing a multi-segment (53a, 53a,
53b, 54a, 54b, 55a, 55b, 56a, 5
6b, 57a, 57b, 58a, 58b) corresponding to any of the divided holes (63a, 63b, 64a, 64b, 65).
a, 65b, 66a, 66b, 67a, 67b, 68
a, 68b) is excavated, and a division operation step of incorporating the relevant segment into the division hole is performed. By repeating such division operation steps sequentially, the entire circumference of the contour of the side hole for which excavation is to be performed is performed. The assembly process of assembling the structure 50 is performed by surrounding all the segments. Thereafter, a horizontal hole completing step of excavating and removing the inner soil to complete the horizontal hole 52 is performed. At this time, a reinforcing step of forming the reinforcing structure 60 is performed.

In the above-described division work step, a shield excavator 1 having a cutter head 3 at the front of a cylindrical shield body 2 as shown in FIG.

The cutter head 3 includes a shield body 2
Excavation part 6 which is arranged near the front end of the frame 4 and which has a plurality of large and small frame-shaped frames 4 combined at intervals in substantially the same plane and connected by a connecting member to form an opening between the frames 4 The excavating means 17 comprising a large number of cutter teeth 41 is provided on the front surface of each frame 4. The excavation part 6 is connected via a connecting arm 8 to a head support part 7 disposed inside the shield main body 2, and the head support part 7 is a tube extending rearward from the center. The shaft 9 is provided. In addition, cutter tooth group 4
The excavating means 17 composed of the first and second excavating means 17 has the above-mentioned divided holes (63a, 63b, 64a, 64b, 65a, 65b,
66a, 66b, 67a, 67b, 68a, 68b), and the cutter teeth 41 are adapted to the soil quality of the ground to be excavated.

The shield body 2 is provided with a partition 1 near the front.
0, and has a cylindrical support 11 fixedly penetrating through the partition 10. The cylindrical support 11 has the cutter head 3 attached thereto.
Is slidably inserted through a bearing member 12. Note that a seal member 22 is disposed between the cylindrical support 11 and the cylindrical shaft 9. Therefore, the cutter head 3 can move back and forth along the axis of the shield main body 2 in the front-rear direction, and a retracting drive device 13 including a hydraulic breaker device or the like for enabling the retracting drive is provided. It is provided within.

In the example shown in FIG.
It is constituted by a hydraulic cylinder device 14 of a hydraulic pressure or the like. The cylinder device 14 is arranged toward the inside of the cylindrical shaft 9, and pivotally connects the tip of the cylinder rod portion 15 to the bottom of the cylindrical shaft 9. And the cylinder device 14
Is connected to a girder portion 16 fixed near the rear portion of the shield main body 2. Therefore, by extending and contracting the cylinder device 14, the cutter head 3 can be driven to move back and forth at the tip of the shield main body 2 as shown by a chain line in FIG. 3.

The cutter head 3 has a sediment intake chamber 40 formed by a space between the excavation part 6 and the head support part 7, and a mud pump that is opened inside the sediment intake chamber 40. The pipe 18 and the sludge pipe 19 are slidably inserted into the head support portion 7 and slidably inserted into the partition wall 10. At the rear position of the partition wall 10, the mud pipe 18 is inserted through a valve. And the sludge pipe 19 is extended rearward to make the girder 1
6 is inserted and led out behind the shield body 2. The mud pipe 18 is for supplying muddy water to the sediment intake chamber 40, and the drain pipe 19 is for discharging sediment slurried in the sediment intake chamber 40. .

In FIG. 3, reference numeral 23 denotes a shield jack arranged at the rear of the shield machine 1;
Similarly, a segmental erector device is disposed at the rear, and 25 is a vibrator (vibration generator).

(Embodiment of the Construction Method of the Present Invention) In the case of the embodiment of the structure 50 shown in FIG. 1, a total of 12 segments (53a, 53b, 54a, 54b, 55a, 55b, 55b,
56a, 56b, 57a, 57b, 58a, 58b), so that a total of 1
2 divided holes (63a, 63b, 64a, 64b, 65
a, 65b, 66a, 66b, 67a, 67b, 68
Twelve shield machines 1 are used for excavating a, 68b).

(Vertical hole forming step) Although not shown in the figure, a vertical hole having a depth to a level at which an underground structure is to be constructed is excavated at a predetermined location on the ground, and the above-mentioned 12 shield excavations are drilled in the vertical hole. Machine 1 is installed. Such a vertical hole is excavated by a conventionally known method, for example, by a backhoe or the like, but may be a hole having a size sufficient and necessary for installing the shield machine 1.

(Division work step) By moving the shield machine 1 forward from the vertical hole to the side, the division hole corresponding to each segment is excavated.

That is, the shield machine 1 drives the cylinder rod portion 15 of the cylinder device 14 while giving vibrations by the vibrator 25, thereby driving the cutter head 3 out and back, and forming a predetermined divided hole in the ground. Go forward while digging. The excavated earth and sand is slurried by muddy water supplied from a mud feeding pipe 18 and discharged to the outside by a mud discharging pipe 19. Thus, shield machine 1
Does not limit the cross-sectional shape of the drilling hole as compared with the one in which the hole is drilled while rotating the cutter head, and the entire shape of the drilling means 17 composed of the cutter teeth 41 corresponds to the cross-sectional shape of each segment described above. By doing so, a divided hole having a cross-sectional shape corresponding to the segment can be formed by excavation. Therefore, by using the twelve shield excavators 1, as shown in FIGS. 2A to 2D, each of the divided holes 63a, 63b, 64a, 64
b, 65a, 65b, 66a, 66b, 67a, 67
b, 68a, 68b can be excavated.

FIG. 2 (A) is a view showing a division hole 63a, 63b for the side wall segments 53a, 53b and upper wall segments 54a, 54b on the contour line L of the horizontal hole to be excavated.
Holes 64a, 64b for the bottom wall segment 55
The state which excavates and forms the division | segmentation hole 65a, 65b for a, 55b is shown. These six split holes are
Excavated and formed by six shield excavators,
The excavating means 17 of the cutter head 3 in each shield excavator has a shape corresponding to the divided hole.

FIG. 2B shows a state in which division holes 67a and 67b for the upper corner segments 57a and 57b are excavated and formed on the contour line L of the horizontal hole to be excavated. These two divided holes 67a, 67b
Excavation is formed by two shield excavators,
The excavating means 17 of the cutter head 3 in each shield excavator has a shape corresponding to the sectional shape of the divided holes 67a and 67b.

FIG. 2C shows a state in which division holes 66a and 66b for the center wall segments 56a and 56b are excavated and formed on the contour line L of the horizontal hole to be excavated. These two divided holes 66a and 66b are formed by excavation by two shield excavators. Therefore, the excavation means 17 of the cutter head 3 in each shield excavator is formed.
Has a shape corresponding to the cross-sectional shape of each of the divided holes 66a and 66b.

FIG. 2D shows a state in which divided holes 68a and 68b for the lower corner segments 58a and 58b are excavated and formed on the contour line L of the horizontal hole to be excavated. These two divided holes 68a, 68b
Excavation is formed by two shield excavators,
The excavating means 17 of the cutter head 3 in each shield excavator has a shape corresponding to the sectional shape of the divided holes 68a and 68b.

(Assembling process) Therefore, a total of twelve divided holes 63a, 63b, 64 excavated and formed as described above.
a, 64b, 65a, 65b, 66a, 66b, 67
a, 67b, 68a, 68b have respective segments 53a, 53b, 54a, 54b, 55a, 55b,
56a, 56b, 57a, 57b, 58a, and 58b are assembled (assembly process), whereby all the segments are formed over the entire circumference of the outline L of the horizontal hole to be excavated as shown in FIG. The surrounding structure 50 is constructed. At this time, if a shell 70 with a guide as shown in FIG. 1 is used for each segment, it is possible to prevent a deviation or the like from occurring in the finish of the structure 50.

By the way, when all the twelve divided holes have been dug, all the divided holes are in communication with each other, so that the twelve segments can be connected and assembled. On the other hand, instead of waiting until all the divided holes have been dug, when some of the divided holes have been dug, the work may be proceeded by incorporating the segment corresponding to the divided hole each time. When the excavation of all the divided holes and the incorporation of all the segments are completed, the structure 50 may be completed by connecting the segments.

(Side Hole Completion Process) Since the inner soil 69 is left in the internal space surrounded by the assembled structure 50, the inner hole 69 is excavated and removed to remove the inner hole. 52 is completed (horizontal hole completing step). Thus, the entire structure 50 is completed as shown in FIG. Excavation and removal of the inner soil 69 may be performed by the same shield excavator 1 as described above, or may be performed by other excavation means.

(Reinforcing Step) Simultaneously with or after the horizontal hole completing step, a reinforcing structure 60 such as the above-described reinforcing column 59 is formed. Such a reinforcing structure 60
At any time, under the size and spacing based on the predetermined design,
It is formed by placing a ready-mixed concrete after performing the formwork and the arrangement of reinforcing bars.

(Final Step) After the construction of the structure, final steps necessary for finishing, such as withdrawing the shield machine from the soil and filling the vertical hole with earth and sand, are performed.

[0032]

According to the present invention, an underground structure is formed by laying a plurality of segments divided along the inner peripheral wall of a lateral hole formed by excavating a shield machine installed in the soil. Since the object is constructed, it is possible to solve all the problems seen in the conventional open cut method.

In particular, according to the present invention, a divided hole corresponding to any one of the plurality of segments is excavated on the contour line L of the horizontal hole which is to be excavated while the soil remains, and the corresponding divided hole is excavated. By configuring the division work that incorporates the segment and performing such division work simultaneously or before and after,
Since the structure 50 is assembled by laying all segments around the entire periphery L of the outline L of the horizontal hole to be excavated, a large-scale complicated structure such as a subway station can be easily formed. Can be built. In addition, since each divided hole is excavated, there is no danger of earth and sand collapse during excavation, and the operation can be performed safely.

The structure 5 is formed by all the segments.
0 is constructed in the soil, and then the inner soil 69 surrounded by the structure is excavated and removed to complete the lateral hole 52 and complete the entire structure of the structure 50. 69 is a state in which the structure 50 is surrounded as a shell, so that the risk of landslide is small, and in this respect, work can be performed safely.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an example of an underground structure constructed by the method of the present invention.

FIG. 2 shows an embodiment of the method of the present invention,
(A), (B), (C), and (D) are cross-sectional views each showing a division work process, (E) is a cross-sectional view showing a structure assembling process,
(F) is sectional drawing which shows a side hole completion process.

FIG. 3 is a cross-sectional view showing an example of a shield machine used for excavating and forming a division hole in the method of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Shield machine 17 Excavation means 52 Side hole 53a, 53b Side wall segment 54a, 54b Top wall segment 55a, 55b Bottom wall segment 56a, 56b Central wall segment 57a, 57b Upper corner segment 58a, 58b Lower corner segment 59 Reinforcement column 60 Reinforcement structure Objects 63a, 63b Dividing holes for side wall segments 64a, 64b Dividing holes for upper wall segments 65a, 65b Dividing holes for bottom wall segments 66a, 66b Dividing holes for central wall segments 67a, 67b Dividing holes for upper corner segments 68a, 68b Divided hole for lower corner segment 69 Middle soil L Outline of horizontal hole to be excavated

Claims (2)

[Claims] 1. A method of constructing an underground structure by circulating a plurality of segments divided along an inner peripheral wall of a lateral hole excavated and formed in soil, wherein the excavation is performed while the soil remains. By digging a division hole corresponding to any of the plurality of segments on the outline of the planned horizontal hole, a division work step of incorporating the segment into the division hole, and performing the division work step simultaneously or before and after, An assembling step of assembling a structure by laying all segments around the entire contour of a side hole to be excavated; and completing a side hole by excavating and removing the inner soil surrounded by the structure A method for constructing an underground structure, comprising: 2. A reinforcing step for forming a reinforcing structure such as a reinforcing column for reinforcing the structure at the same time as or after the horizontal hole completing step. Construction method of underground structure described in 4.