JP3361271B2 - Construction method of large annular structure underground - Google Patents

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 a large annular structure which is used for roads, railways and the like, and which uses multiple segments composed of arc segments, connecting arc segments, joint segments and supporting segments. .

[0002]

2. Description of the Related Art Construction techniques for large annular structures used for roads and railways have already been developed and proposed.

[0003]

However, in the prior art, there was a point to be further improved in constructing a large structure with high accuracy and safety, safely performing the construction work, and the like.

The present invention has been made in view of the above circumstances, and an object of the present invention is to construct a structure with higher accuracy and safety, and to perform a construction work more safely. It is to provide a method for constructing a large annular structure that can be used.

[0005]

Means for Solving the Problems] To achieve the above object, the present invention is, prior to the ground, placed a predetermined distance, the onsite striking shield tunneling at a position corresponding to a corner of a large annular structure The tunnels 3A, 3B, 3C, ... Are constructed, and the interior space 5 of each of the leading tunnels 3A, 3B, 3C, ...
3B, 3C, ... Are connected by connecting tunnels 7A, 7B, 7C, ... Which are constructed by excavating the shield machine 10 and assembling multiple circular segments in the shield machine 10, and the preceding tunnels 3A, 3B, 3C, The filling material 6 and the connecting tunnels 7A, 7B, 7C, ...
Of the segment is removed to form an annular space 43, a reinforcing material 44 is installed in the annular space 43, concrete 45 is placed, and an inner ground G2 surrounded by the annular space 43 is excavated. Removed and large internal space 4
6 is formed.

Further, when the upper connecting tunnel 7A is constructed after the side connecting tunnels 7B, ... Are constructed, the segments of the side connecting tunnels 7B ,. It is constructed to be constructed.

The connection tunnels 7A, 7B, 7C, ...
Is constructed in the order of the bottom portion, the side portion, and the upper portion. When the connecting tunnels 7B on the left and right sides are constructed after the connecting tunnel 7C on the bottom portion is constructed, the left and right inner spaces 39 at both ends of the connecting tunnel 7C on the bottom portion are left and right. The left and right connecting tunnels 7 in the connecting tunnel 7C at the bottom part in order to prevent the shield machine and the back-filling portion from protruding when constructing the connecting tunnel 7B, ...
The segment that interferes with B, ... Is disassembled, partition plates 40 are attached to both ends of the internal space 39, concrete 41 is filled, and after the construction of the left and right connection tunnels 7B ,. It is configured to be removed and installed.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

1 to 7 show an embodiment of the present invention. As can be seen from FIG. 1, a starting shaft 1 and a reaching shaft 2 are constructed at predetermined points. In addition, in FIG. 1, 1a shows a starting wellhead and 2a shows a reaching wellhead.

Next, as can be seen from FIGS. 2 and 3,
Four leading tunnels 3A to 3 from the starting shaft 1 to the reaching shaft 2 at the point corresponding to the corner of the large annular structure to be built
Build D. These four preceding tunnels 3A-3D
Will be constructed in the order of the preceding tunnels 3A → 3B → 3C → 3D. Further, the prior tunnel 3A~3D is applied by onsite beating shield tunneling.

As shown in FIGS. 1 and 2, a lining body 4 is constructed in each of the preceding tunnels 3A to 3D. The lining body 4 is constructed of uncast or cast-in-place concrete containing steel fibers.

As can be seen from FIG. 3, a filling material 6 is placed in the inner space 5 of each lining body 4. In this filler 6,
The one having a consolidation strength of about 20 to 100 kgf / cm 2 is desirable. Specifically, low strength concrete,
Soil concrete or backfill pouring material used in conventional methods is preferred. In the case of the soil concrete, the excavated soil generated during shield excavation may be used.

Next, as shown in FIG. 3, adjacent leading tunnels, that is, leading tunnels 3A, 3B, 3B, 3C,
Connection tunnel 7A connecting 3C / 3D, 3D / 3A,
Build 7B, 7C and 7D. These connecting tunnels 7
A to 7D are constructed and constructed in the order of connection tunnel 7C → 7D → 7B → 7A. Also, the connection tunnels 7A-7
In order to construct D, first, a shield machine having a vertically or horizontally long rectangular cross section or an oval cross section is dug, and in this embodiment, each connecting tunnel 7A to 7D is constructed by connecting six shield machines.

Each shield machine 10 shown in FIG.
Use an eccentric multi-axis shield machine as shown in. The shield machine 10 shown in FIG. 5 includes a shield machine outer shell portion 11, a partition wall 12, a hood 13, a chamber 14 for excavated earth and sand, a cutter portion 15, a cutter drive portion 22, a shield jack 25, and a discharge jack. The soil device 27 and the tail seal 31 are provided.

In the shield machine 10 of this embodiment, each part is constructed to excavate a rectangular cross section.

The cutter unit 15 has a crank 16 and a cutter frame 20. A plurality of the cranks 16 are provided on the partition wall 12 at predetermined intervals. Each crank 16 has a crank shaft 17 rotatably supported by a partition wall 12 via bearings (not shown), a crank arm 18, and a cutter shaft 19 which is a crank pin. The cutter frame 2
0 is commonly attached to a plurality of cutter shafts 19. The cutter frame 20 is provided with many cutter bits 21.

The cutter driving unit 22 is provided for each crank 16
It is installed in one group. Each cutter driving unit 22 is configured to have a motor 23 and a speed reducer 24, and is configured to rotate the crank 16. Along with this, the cutter unit 15 is adapted to perform a parallel crank movement.

A plurality of shield jacks 25 are installed in the outer shell 11 of the shield machine. Each shield jack 25 is provided with a jack spreader 26 that comes into contact with the segment.

The earth unloading device includes a first screw conveyor 28 installed so that the intake of the excavated earth and sand faces the chamber 14, a second screw conveyor 29 connected to the first screw conveyor 28, and an earth unloading device driving section 30. Is configured.

The tail seal 31 is provided on the rear portion of the shield machine outer shell 11 and is in contact with the outer periphery of the assembled segment.

In the shield machine 10 of this embodiment, however, a plurality of cutter drive units 22 are driven in the same direction all at once, so that the cutter frame 2 is driven through the crank 16.
0 makes a parallel rotational movement, and a large number of cutter bits 21 provided in the cutter frame 20 excavate the ground (face) G1 and take the excavated earth and sand into the chamber 14. As a result, the face can be excavated in a rectangular cross section that is substantially similar to the cutter frame 20.

Then, the inside of the chamber 14 is kept at a predetermined pressure by the excavated earth and sand, and the excavated earth and sand is carried out through the inside of the shield machine outer shell portion 11 to the rear of the mine by the earth discharging device 27 while preventing the face from collapsing.

After excavating the natural ground G1 within a predetermined range, the shield jack 25 is extended to apply a reaction force to the segment assembled behind the outer shell 11 of the shield machine to shield the shield machine 1.
Promote 0 as a whole. After that, the shield jack 25 is reduced and the segments are assembled behind the shield machine outer shell 11.

As described above, in this embodiment, the shield machine 10 having a vertically long or horizontally long rectangular cross section is dug to obtain the shield machine 1.
Assemble 6-segment segment 32 behind 0 and propel it.

As shown in FIGS. 3 and 4, the six continuous segment 32 has a plurality of arc segments 33 at both ends.
Constructed in combination, the middle part is connected arc segment 3
4, the segment 33 at both ends, the segment 34 at the intermediate portion, and the adjacent segments at the intermediate portion are constructed by combining the joint segment 35 and the support segment 36.

A shield machine 10 for constructing the connection tunnel
According to the promotion of the
As shown in FIG. 3, the tail voids 2 and 3 are filled with the back-filling injection material 38 from the back-filling injection port 37. As the backfill material 38, a backfill material that has been conventionally used, low-strength mortar, or concrete is preferable. The strength of the backfill injection material 38 is 5 to 100 kgf.
A material having a fluidity of about / cm 2 is preferable.

After the construction of the connecting tunnel 7C at the bottom,
When constructing the left and right connecting tunnels 7D, 7B, in order to prevent the shield machine 10 and the backfilling portion of the left and right connecting tunnels 7D, 7B from protruding in advance in the internal space 39 at both ends of the bottom connecting tunnel 7C, As can be seen from FIG. 3, the arc segment 33 of the portion of the bottom connecting tunnel 7C that interferes with the left and right connecting tunnels 7D and 7B is disassembled, and the inner space 39 at both ends of the bottom connecting tunnel 7C is disassembled.
The partition plate 40 is attached to and the concrete 41 and the like are filled. After the construction of the left and right connecting tunnels 7D and 7B, the partition plate 40 and the concrete 41 are removed.

When constructing the upper connecting tunnel 7A after constructing the left and right connecting tunnels 7D and 7B, as also seen from FIG. 3, the left and right connecting tunnels 7D and 7B.
The arc segment 33 of the portion that interferes with the upper connecting tunnel 7A is removed in advance.

As described above, in this embodiment, the spaces at the upper and lower ends or the left and right ends of the connecting tunnels 7A to 7D are the lining body 4 constructed by cast-in-place concrete in the preceding tunnels 3A to 3D, and this covering. Since the filling material 6 such as low-strength concrete filled in the internal space 5 of the work body 4 is excavated and formed, it is easy to secure the directionality of the connecting tunnel, and therefore the accuracy of the connecting tunnels 7A to 7D is improved. As a result, it is possible to build a highly accurate and safe large annular structure.

After constructing the structure 42 by the preceding tunnels 3A to 3D and the connecting tunnels 7A to 7D, a covering body 4 having no corner portion formed by the connecting tunnels 7A to 7D in the preceding tunnels 3A to 3D is formed. And filler 6
And the backfill injection material 38 in the connection tunnels 7A to 7D
Unnecessary arc segments 33 on both ends are removed to form an annular space 43 as shown in FIG. The connecting arc segment 34, the joint segment 35, and the support segment 36 in the connecting tunnels 7A to 7D are left as they are as a reinforcing material.

After building the structure 42, the groundwater in the ground G2 inside the structure 42 is sucked by a vacuum pump (not shown) or the like so that the influence of the groundwater pressure in the soil can be ignored. .

As described above, by utilizing the internal space formed in each of the preceding tunnels 3A to 3D by removing unnecessary portions, a reinforcing member 44 such as a reinforcing bar or a steel frame is assembled and installed in the annular space 43. , To give the necessary strength as a large annular structure.

Next, the annular space 4 in which the reinforcing member 44 is installed
Concrete 45 is placed in 3. In this case, the concrete 45 may be partially cast if necessary.

As can be seen from the above description, in this embodiment, since the connecting tunnels 7A to 7D can be connected inside the preceding tunnels 3A to 3D, the connecting work can be performed safely.

Further, since the reinforcing member 44 such as a reinforcing bar or a steel frame can be assembled by utilizing the internal space formed by removing unnecessary portions of the constituent members of the preceding tunnels 3A to 3D, the reinforcing member can be assembled. It is possible to ensure safety when assembling 44.

Then, the internal ground G2 of the structure 42 is excavated and discharged to form an internal space 46 having a large cross section, as shown in FIG.
The large annular structure 47 shown in is completed.

In the embodiment described above, the preceding tunnel 4
A to 4D at the point where it hits the corner of the large annular structure 47
I'm building. The preceding tunnels 3A, 3B, 3C, ...
It suffices that the connection tunnels 7A, 7B, 7C, ... Are constructed at a predetermined interval from each other.

FIG. 8 shows another embodiment 1 of the connection tunnel of the present invention. This figure shows a right half sectional view corresponding to FIG. 3 of the above-mentioned embodiment. However, this embodiment is characterized in that the vertical connecting tunnel 7B 'and the horizontal connecting tunnels 7A', 7C 'are in the shape of an oval shield.

That is, in the above-described embodiment, as shown in FIG. 3, when the left and right connecting tunnels 7D and 7B are constructed after the bottom connecting tunnel 7C is constructed, the inside of both end portions of the bottom connecting tunnel 7C is constructed. In order to prevent the shield machine and the backfill portion of the left and right connecting tunnels 7D and 7B from protruding into the space 39 in advance, as can be seen from FIG. 3, the left and right connecting tunnels 7D and 7B in the bottom connecting tunnel 7C.
It takes time and effort to disassemble the arc segment 33 of the portion that interferes with.

When constructing the upper connecting tunnel 7A after constructing the left and right connecting tunnels 7D, 7B, as also seen from FIG. 3, the left and right connecting tunnels 7D, 7B are also formed.
It is necessary to remove the arc segment 33 of the portion which interferes with the upper connecting tunnel 7A in advance.

On the other hand, in the first embodiment shown in FIG. 8, the horizontal and vertical connecting tunnels 7A 'to 7D' (7D 'is not shown because it is on the left side) is formed into an oval shape instead of a rectangular cross section. In addition, since each end portion has an arcuate cross section and has a shape that does not interfere with each other, there is an advantage that such labor is not required.

As shown in FIG. 9, the connecting tunnel 7
From the viewpoint of structural mechanics such as A ″ and 7B ″, the shape may be an arc shape convexly curved toward the natural ground side. In this case, the shield is an arcuate elliptical shield corresponding to the shape of these connecting tunnels, and the segments are arcuate multiple circular segments. The other parts are basically the same as those in the above-described embodiment, and therefore, the same members have the same reference numerals,
Detailed description is omitted.

[0043]

As described in the foregoing, in the ground in the present invention, placed a predetermined distance, the large annular structure corners in the prior tunnel 3A by onsite striking shield method, 3B, 3
C, to build a ..., each preceding tunnel 3A of corners,
The interior space 5 of 3B, 3C, ... Is filled with the filling material 6, and the adjacent preceding tunnels 3A, 3B, 3C ,.
Connecting tunnels 7A, 7 constructed by assembling multiple circular segments in the shield machine 10 at the same time as digging 0
Are connected by B, 7C, ..., and the end portions of the connection tunnels 7A, 7B, 7C, ... Excavate the filling material 6 filled in the internal space 5 of the preceding tunnels 3A, 3B, 3C ,. Since it will be formed, it will be connected tunnels 7A, 7
Since the directionality of B and 7C is secured, the connecting tunnel 7
As a result of improving the accuracy of A, 7B, 7C, ...
It has the effect of being able to build a highly accurate and safe large annular structure.

In the present invention, the preceding tunnel 3A,
The filling material 6 in the inner space 5 of 3B, 3C, ... And the unnecessary portions of the segments of the connecting tunnels 7A, 7B, 7C, ... Are removed to form the annular space 43, and the connecting tunnels 7A, 7B, 7C are formed. ,… The preceding tunnel 3
Since it can be connected inside A, 3B, 3C, ..., In addition to the effect that the connecting work can be performed safely, the preceding tunnel 3
Since the reinforcing member 44 can be assembled by utilizing the internal space formed by removing unnecessary portions of A, 3B, 3C, ..., It is also possible to ensure the safety when assembling the reinforcing member 44. is there.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional side view showing a process of excavating and constructing a preceding tunnel in the ground from a starting shaft to a reaching shaft.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is a vertical sectional front view showing a process of connecting adjacent preceding tunnels by a connecting tunnel.

FIG. 4 is an enlarged vertical front view showing an example of the structure of a connection tunnel.

FIG. 5 is a vertical enlarged side view showing an example of a shield machine for excavating a shield for constructing a connected tunnel.

FIG. 6 is a vertical cross-sectional front view showing a process following FIG. 3 in which an annular space is formed over the preceding tunnel and the connecting tunnel, and a reinforcing material is installed in the annular space.

FIG. 7 is a vertical sectional front view showing a completed large-sized annular structure.

FIG. 8 shows another embodiment 1 of the connection tunnel of the present invention.

FIG. 9 shows another embodiment 2 of the connection tunnel.

[Explanation of symbols]

1 Starting shaft 2 Arrival shaft 3A-3D Leading tunnel 4 Lining body 5 Inner space of lining body 6 Filler material 7A-7D Connection tunnel 10 Shielding machine 11 Shielding machine outer shell 12 Partition wall 13 Hood 14 Drilling earth and sand chamber 15 Cutter Part 16 Crank 22 Cutter drive part 25 Shield jack 27 Soil removal device 31 Tail seal 32 Six continuous segment 38 Backfill injection material 42 Structure constructed by preceding tunnel and connecting tunnel 43 Annular space 44 Reinforcement material 45 Concrete G1 ground Mountain G2 Internal ground of structure 46 Large cross section internal space 47 Completed large cross section annular structure

Continued front page    (72) Inventor Tsutomu Tomizawa               1-24-4 Shinkawa, Chuo-ku, Tokyo Otoyo               Construction Co., Ltd.                (56) Reference JP-A-7-229387 (JP, A)                 JP-A-2-144499 (JP, A)                 Japanese Patent Publication 8-19824 (JP, B2)

Claims (3)

(57) [Claims] To 1. A ground, placed a predetermined distance prior tunnel 3A by onsite striking shield method to the corner of a large cyclic structure, constructed 3B, 3C, ... and each preceding these corners The interior space 5 of the tunnels 3A, 3B, 3C, ... Is filled with the filling material 6, and the preceding tunnels 3A, 3B, 3C ,.
The shield machine 10 and the shield machine 10
Are connected by connecting tunnels 7A, 7B, 7C, ... Composed by assembling multiple circular segments therein, and the filling material 6 and the connecting tunnels 7A, 7B of the internal space 5 of the preceding tunnels 3A, 3B, 3C ,. Unnecessary portions of the 7C, ... Segments are removed to form an annular space 43, a reinforcing material 44 is installed in the annular space 43, and concrete 45 is placed, and an inner ground surrounded by the annular space 43. A method for constructing a large annular structure in the ground, which comprises excavating and removing G2 to form an internal space 46 having a large cross section. 2. The connection tunnels 7A, 7B, 7C, ... Are constructed in the order of bottom, side, and top, and the connection tunnel 7 at the bottom is formed.
When constructing the connecting tunnels 7B on the left and right sides after the construction of C, the internal spaces 3 at both ends of the connecting tunnel 7C at the bottom are constructed.
In order to prevent the shield machine and the back-filling portion from projecting when the left and right connecting tunnels 7B are installed on the left and right connecting tunnels 7C, the left and right connecting tunnels 7B, ...
After disassembling the segment of the portion that interferes with, attaching partition plates 40 to both ends of the internal space 39 and filling concrete 41, and after connecting the left and right connecting tunnels 7B, ...
The method for constructing a large annular structure in the ground according to claim 1, wherein the partition plate 40 and concrete are removed before construction. 3. When constructing the upper connecting tunnel 7A after constructing the side connecting tunnel 7B, ..., Removing the segment of the portion of the side connecting tunnel 7B, ... Interfering with the upper connecting tunnel 7A in advance. The method for constructing a large annular structure in the ground according to claim 1, which is constructed.