JP3616898B2 - Method for joining underground structures using propulsion device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for joining subsurface structures using a propulsion device, and in particular, a casing is press-fitted between subsurface structures such as tunnels at close positions so as to propel them and join between subsurface structures. The present invention relates to a method for joining underground structures to construct a tunnel.
[0002]
[Prior art]
In recent years, a lot of deep joint grooves have been constructed in urban areas. These common grooves are often constructed in deep locations to avoid existing underground structures. In that case, the depth becomes deeper than 30 m. In order to minimize the occurrence of traffic congestion on the ground, shield tunnels are often constructed instead of the open-cut method. Various types of buried objects such as electric wires, telephone lines, gas pipes, and water and sewage systems are laid by each operator in the common groove tunnel constructed as a shield tunnel. Then, the management company of these laid buried objects constructs a horizontal shaft in the above-mentioned joint groove tunnel from the extraction shaft constructed at a predetermined position based on the business plan, and passes through the horizontal shaft and the extraction shaft. The buried object is taken out to the ground.
[0003]
FIG. 6 shows a common groove tunnel constructed at a deep depth, a take-out shaft 51 having a depth to the side close to the common groove tunnel 50, and a horizontal shaft that connects the common groove tunnel 50 and the take-up shaft 51 ( Junction tunnel) 60. Normally, the extraction shaft 51 is constructed in the vicinity of the already constructed common groove tunnel 50. The distance between the common groove 50 and the shaft 51 is about 10 m at the maximum, and is usually set to about 2 m to 3 m. And the horizontal shaft 60 is constructed so that these structures may be joined.
[0004]
[Problems to be solved by the invention]
By the way, the natural ground 61 between the adjacent structures is often loose due to the influence of excavation of the existing underground structure, and sufficient caution is required for excavation. Further, when excavation is started from the shaft 51, the side wall concrete 52 of the shaft 51 must be crushed, and in that case, the natural ground collapse outside the side wall must be prevented. For this reason, the ground improvement work is usually performed in a range 62 surrounding the ground 61 of the separated portion, and a horizontal pit (junction tunnel) 60 is constructed in the ground improvement range.
Even when the junction tunnel 60 as shown in FIG. 6 is constructed, it is necessary to perform ground improvement work in a relatively wide range 62, which increases the construction cost and the construction period. In addition, the face may collapse during tunnel excavation.
[0005]
Therefore, the object of the present invention is to solve the problems of the conventional technology described above, to perform safe construction, and to indirectly construct underground structures using a propulsion device that can construct a horizontal tunnel as a highly accurate junction tunnel. It is to propose a joint method.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a propulsion device that constructs a tubular tunnel by sequentially press-fitting into a natural ground while turning a casing with a cutting bit attached to the tip, and sequentially connecting the casings. Installed in the start side of the structure, cut out a part of the wall on the start side into a shape that allows the casing to pass through, and press-starts the casing into the natural ground by the propulsion device, and into the casing The casing is press-fitted to the existing underground structure on the arrival side while supporting the excavated earth and sand taken in the casing with the part of the wall body left behind and supporting the excavated earth and sand taken in the casing. And a junction tunnel is constructed between the underground structures.
[0007]
A part of the wall body left in the casing is retracted in a direction opposite to the moving direction of the casing in accordance with the press-fitting of the casing into the natural ground so that the excavated earth and sand is taken into the casing. It is preferable to do.
[0008]
The underground structure on the start side is a shaft, the underground structure on the arrival side is a joint groove tunnel, and part of the buried object laid in the joint groove tunnel through the constructed tunnel Is preferably taken out into the shaft.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of a joining method between underground structures using the propulsion device of the present invention will be described with reference to the accompanying drawings.
[0010]
FIG. 1 shows a propulsion device 10 installed with the cutting edge facing the side wall concrete 2 at the bottom of the vertical shaft 1 constructed as the above-described vertical shaft. In the present embodiment, the propulsion device 10 uses a casing full-slewing rotary press-fitting machine (hereinafter, the rotary press-fitting machine is denoted by reference numeral 10). The rotary press-fitting machine 10 includes a gripping mechanism 12 that grips a large-diameter steel casing 11, a press-fitting mechanism 13 that press-fits the gripped casing 11 in the traveling direction, and a casing 11 with a casing axis as a rotation axis. And a rotation drive mechanism 14 that rotates the lens in the circumferential direction. Each of these mechanisms 12 to 14 is incorporated in a rigid frame 15. The rigid frame 15 supports a reaction force that acts through the casing 11 when the casing 11 is rotationally press-fitted in the traveling direction. In the present embodiment, the press-fitting mechanism 13 is composed of a plurality of hydraulic jacks (not shown) arranged at predetermined intervals at the outer peripheral position of the casing. The casing 11 that rotates by the expansion and contraction of the cylinder rod of these hydraulic jacks can be press-fitted to the natural ground side.
[0011]
As shown in FIG. 1, the rotary press machine 10 is installed with a ring-shaped guide frame 17 in close contact with two side walls of the side wall concrete in a state where the casing 11 is gripped sideways at the bottom of the shaft 1. At this time, in order to support the operation reaction force of the rotary press-fitting machine 10, the reaction force steel material 4 is installed over the opposite side wall concrete 3.
[0012]
On the other hand, the casing 11 attached to the rotary press-fitting machine 10 is composed of a cutting edge casing 11A at the tip, and cylindrical casings 11B, 11C (see FIG. 2) sequentially connected to the rear of the cutting edge casing 11A. Of these, a sawtooth bit 11a is formed at the tip of the blade casing 11A, and a carbide tip (not shown) is attached to the tip of the sawtooth bit 11a. The cutting edge casing 11A to which the cemented carbide tip is attached can be pressed against the surface of the side wall concrete 2 while being rotationally driven, and the side wall concrete 2 can be cut out by a ring-shaped cutting groove. In this way, rotational press-fitting by the casing is started from a state in which the tip of the blade edge casing 11A protrudes from the outer side surface of the shaft toward the ground.
[0013]
Prior to this start, it is preferable to attach the rubber-made entrance packing 5 (see FIG. 3) in a ring shape to the outer peripheral position of the side wall concrete 2 that is cut out by the blade casing 11A. Alternatively, low-strength concrete may be cast from the beginning in the portion of the side wall concrete 2 that is cut out by the blade edge casing 11A, or the concrete cutting work by the blade edge casing 11A may be performed smoothly by reducing the amount of bar arrangement.
[0014]
FIG. 2 is a state diagram showing a state in which the casing 11 is press-fitted toward the common groove tunnel (not shown) from the shaft 1 side by the casing rotary press-fitting of the rotary press-fitting machine 10. As indicated by an arrow in the figure, the blade casing 11A is rotationally press-fitted, and the casing 11C is joined to the rear end of the casing 11B as the entire blade casing 11A advances in the natural ground.
[0015]
Here, the behavior of excavated earth and sand taken into the casing 11 when the casing 11 is rotationally press-fitted into the natural ground will be described with reference to FIG. In FIG. 3, the side wall concrete 2 of the shaft 1 from which the casing 11 partially shown in cross section starts is sharply cut by the sawtooth bit 11a of the cutting edge casing 11A having a ring-shaped cross section. The circular concrete plate 6 that was a part of the side wall is left in the casing 11 so as to close the cross section of the casing 11. As shown in FIG. 3, the circular concrete plate 6 is supported by the support rod 7 from the rear wall surface of the casing 11, so that it can be used as a sediment closing plate in the casing 11. That is, when the rotary press machine 10 is operated from this state to press-fit the cutting edge casing 11 </ b> A in the traveling direction, a part of the natural ground cut by the cutting edge casing 11 </ b> A is taken into the casing 11 as excavated earth and sand 9. At this time, the support rod 7 for supporting the circular concrete plate 6 is slightly retracted rearward in synchronism with the press-fitting of the cutting edge casing 11A so that the excavated earth and sand 9 is placed in the cutting edge casing 11A and the cylindrical casing 11B connected thereto. It can be taken in efficiently. Thereby, the press-fitting load of the cutting edge casing 11A is reduced, and the casing press-fitting becomes easy. As a result, the capacity of the drive motor of the press-fitting mechanism of the rotary press-fitting machine 10 can be reduced. At this time, in order to improve the waterproof property between the casing inner peripheral surface 11d and the circular concrete plate outer peripheral edge 6a, it is preferable to attach the ring-shaped waterproof packing 8 along the concrete plate outer peripheral edge 6a.
[0016]
On the other hand, in the common groove tunnel 30 on the arrival side of the casing 11, as shown in FIG. 4, a reinforcing wall 31 is constructed on the side wall portion where the blade edge casing 11A reaches. Low-strength concrete or the like can be used for the reinforcing wall 31. At this time, it is preferable to bury an O-ring-shaped waterproof packing 32 at a position equal to the outer peripheral diameter of the casing 11 in the reinforcing wall 31. The waterproof packing 32 keeps the waterproof property between the outer peripheral surface 11e of the casing 11 and the inner peripheral edge 34 of the opening 11 when the tip of the blade casing 11A penetrates the tunnel lining 33 and the reinforcing wall 31 and reaches the tunnel. Can do. In this way, the tip of the casing reaches the common groove tunnel 30, the cutting edge casing 11 </ b> A is accommodated in the tunnel, and the propulsion is completed in a state where the two structures are connected by the tunnel 40 by the cylindrical casing 11. The cutting edge casing 11A portion is removed in the common groove tunnel 30, and excavated earth and sand taken into the casing 11 is carried out of the common groove tunnel 30 or the shaft 1 by a known means.
[0017]
FIG. 5 is an overall configuration diagram showing a tunnel (horizontal shaft) 40 constructed by the joining method according to the present invention. In this tunnel 40, the casing 11 has a function as a primary lining, and can prevent the collapse of a natural ground. Furthermore, in order to use the tunnel 40 as a horizontal shaft of a permanent structure, it is preferable to construct a secondary lining concrete 41 on the inner peripheral surface of the casing 11.
[0018]
Thus, by performing full section excavation using the casing by the propulsion device between adjacent underground structures, a horizontal shaft can be safely constructed between the structures. In the above description, the tunnel 40 is constructed from the vertical shaft 1 to the side surface of the existing common groove tunnel 30. However, the present invention is not limited to this structure. Needless to say, is applicable.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram showing an embodiment of an apparatus installation in an initial state in a method for joining underground structures using a propulsion device according to the present invention.
FIG. 2 is a state explanatory view showing a state in which a casing is rotationally press-fitted into a natural ground by a propulsion device.
FIG. 3 is a state explanatory view showing a state of excavated earth and sand taken into the casing in the state shown in FIG. 2;
FIG. 4 is a state explanatory view showing a state in which a casing is rotationally press-fitted into a natural ground between a vertical shaft and a common groove tunnel.
FIG. 5 is an overall configuration diagram showing a tunnel constructed between a shaft and a common groove tunnel by the method of the present invention.
FIG. 6 is an overall configuration diagram showing a tunnel constructed between a vertical shaft and a common groove tunnel by a conventional method.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Vertical shaft 2, 3 Side wall concrete 5 Entrance packing 6 Circular concrete board 8, 32 Waterproof packing 9 Excavation earth 10 Rotary press machine 11 Casing 11A Cutting edge casing 30 Joint groove tunnel 40 Joint tunnel (horizontal shaft)

Claims (3)

A propulsion device that builds a tubular tunnel by sequentially connecting the casings by pressing the casing with the cutting bit attached to the tip while swiveling is installed in the start side of the existing underground structure, A part of the starting wall is cut into a shape that allows the casing to pass therethrough, and the casing is press-fitted and started into a natural ground by the propulsion device, and the part of the wall remaining in the casing While the casing is closed and the excavated earth and sand taken into the casing is supported by a part of the wall body, the casing is press-fitted to the existing underground structure on the arrival side and joined between the underground structures A method for joining underground structures using a propulsion device characterized by constructing a tunnel. A part of the wall body left in the casing is retracted in a direction opposite to the moving direction of the casing in accordance with the press-fitting of the casing into the natural ground so that the excavated earth and sand is taken into the casing. A method for joining underground structures using the propulsion device according to claim 1. The underground structure on the start side is a shaft, the underground structure on the arrival side is a joint groove tunnel, and part of the buried object laid in the joint groove tunnel through the constructed tunnel The method for joining underground structures using the propulsion device according to claim 1, wherein:

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