JP2004204624A - Ground protection method under vehicle road - Google Patents

Abstract

For example, when constructing a tunnel under a vehicle traveling road, a soil protection member capable of reducing the earth covering and increasing the degree of freedom of the tunnel design and suppressing deformation of the soil. To provide a method for inserting
A method of protecting a ground by inserting a protective plate having rigidity into a ground below a vehicle traveling path, wherein a protection plate is provided in the ground between a start side and an arrival side of the protective plate. A pair of guide tubes 6 is installed, and a driven pulley 9 provided on the starting side or the arrival side and a driven pulley 7 attached to the tip of the protection plate 2 and moving within the pair of guide tubes 6 are provided with a wire saw or the like. The flexible cutting tool 10 is wound endlessly, and the driving pulley 9 is driven to circulate the flexible cutting tool 10 to cut the ground between the guide tubes 6 in the horizontal direction while simultaneously cutting the ground. Insert the protection plate 2 into the section.
[Selection] Fig. 2

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a ground protection method under a vehicle traveling path, and more particularly, when constructing a tunnel crossing the traveling path on the ground below the vehicle traveling path such as a railway track or a road, It relates to the protection method for protection.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, when a tunnel (underground structure) crossing a traveling path such as a railway track or a road is constructed on a ground under a traveling path of a vehicle, a construction method in which a protective member is inserted into the ground beforehand to protect the ground has been adopted. I have.
[0003]
Such protection methods include a pipe roof method in which a plurality of steel pipes are inserted into the ground to cover the top of the tunnel, and a box-shaped roof formed by inserting a number of elements into the ground, and then forming a box ( There is known an R & C (R & C) method of replacing with a box culvert. However, all of these conventional methods can point out the following problems.
[0004]
That is, in the pipe roof method, since a tunnel is constructed below the pipe roof, the earth covering must be thickened, and the degree of freedom in tunnel design is reduced. In addition, in the R & C method, since the member is inserted into the ground twice, such as insertion of an element and replacement with a box, the deformation of the ground and, in the case of a track, a track deformation are likely to occur.
[0005]
[Problems to be solved by the invention]
The present invention has been made based on the technical background as described above, and achieves the following objects.
An object of the present invention is to reduce the earth covering and increase the degree of freedom in tunnel design when, for example, constructing a tunnel below a vehicle traveling road, and furthermore, the deformation of the ground and the track deformation. An object of the present invention is to provide a protection method for a mountain which can be suppressed.
[0006]
[Means for Solving the Problems]
The present invention employs the following means to achieve the above object.
That is, the present invention is a construction method of protecting the ground by inserting a protective plate having rigidity into the ground below the vehicle traveling path,
Ground protection near the tip of the protection plate is horizontally cut by a flexible cutting tool such as a wire saw while simultaneously inserting the protection plate into the cut portion. In the construction method.
[0007]
By pulling the flexible cutting tool and the protection plate from the reaching side of the protection plate, the protection plate can be inserted into the ground.
[0008]
Further, the present invention is a construction method for protecting the ground by inserting a protective plate having rigidity into the ground below the vehicle traveling path,
A pair of guide pipes is installed in the ground between the start side and the arrival side of the protection plate, and the pair of guide pipes attached to the driving pulley provided on the start side or the arrival side and the tip of the protection plate. A flexible cutting tool such as a wire saw is endlessly wound around a driven pulley that moves in the guide tube of
By circulating the flexible cutting tool by driving the driving pulley, the ground between the guide pipes is horizontally cut while simultaneously inserting the protection plate into the cut portion. To protect the mountain below the road where the vehicle runs.
[0009]
The protection plate is divided into a plurality of parts along the insertion direction, and the front ends thereof are stored in a box-shaped case member having an entrance at the rear end side, and the driven pulley is attached to the front end of the case member. Can be adopted.
In this specification, "cutting the ground horizontally" means that the cutting of the ground proceeds in the horizontal direction, and does not mean the direction of the cutting surface formed as a result of the cutting. . That is, the cutting surface is not limited to a horizontal plane, but also includes a vertical plane.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view along a traveling path such as a track or a road, and shows an example of an insertion form of a protection plate. In the figure, reference numeral 1 indicates a tunnel cross section, and reference numeral 2 indicates a protective steel plate as a protective plate. FIG. 1A shows an example in which the protective steel plate 2 is inserted into the ground so as to cover the top of the tunnel and form a single character. FIG. 1B shows an example in which the protective steel plate 2 is inserted into the ground so as to cover the top and both sides of the tunnel and form a gate. FIG. 1C shows an example in which the protective steel plate 2 is inserted into the ground so as to cover the entire periphery of the tunnel and form a box. FIG. 1D shows an example in which the protective steel plate 2 is inserted into the ground so as to cover the entire periphery of the tunnel and form a double box. In addition, the protective steel plate 2 can be used not only for protection of the ground, but also as a tunnel main body structure.
[0011]
As will be understood from FIG. 1, the protective steel plate 2 is inserted horizontally into the ground in a horizontal or vertical state. Hereinafter, details of the case where the protective steel plate 2 is inserted into the ground in a horizontal state will be described. I do. 2A and 2B show a first embodiment of the insertion method, wherein FIG. 2A is a horizontal sectional view and FIG. 2B is a vertical sectional view.
[0012]
A starting shaft 4 and a reaching shaft 5 are constructed on both sides of the traveling path 3. A pair of guide pipes 6 are installed in the ground between the starting shaft 4 and the reaching shaft 5 at intervals corresponding to the width of the protective steel plate 2. The guide tube 6 is a steel tube, but may be a synthetic resin tube such as vinyl chloride.
[0013]
Driven pulleys 7 are attached to both ends of the protective steel plate 2. A plurality of driven pulleys 8 for adjusting the direction change and the feeding length of the wire saw 10 and a drive pulley 9 are installed inside and outside the starting shaft 4. A wire saw 10 is wound around these driven pulleys 7 and 8 and the driving pulley 9 endlessly. The wire saw 10 is a well-known wire saw having a number of diamond bits attached to wires at appropriate intervals, and is known as a cutting tool for cutting reinforced concrete. A chain saw can be used instead of a wire saw.
[0014]
The reaching shaft 5 is provided with a towing jack 12 that operates by receiving a reaction force from the reaction wall 11, and a towing wire rope 13 gripped by the towing jack 12 is fixed to the tip of the protective steel plate 2. The tow wire rope 13 boils between the starting shaft 4 and the reaching shaft 5 and is inserted in advance into the boring hole. However, as in another embodiment described later (FIGS. 3 and 4), the inside of the guide tube 6 is formed. May be inserted into
[0015]
The protective steel plate 2 is inserted into the ground as follows. That is, the protective steel plate 2 is pulled by the towing jack 12 from the starting shaft 4 to the reaching shaft 5. With this traction, the driven pulley 7 attached to the tip of the protective steel plate 2 moves in the guide tube 6. Further, the driving pulley 9 is driven by the towing, whereby the wire saw 10 circulates and travels as shown by the arrow A, and is pulled by the protective steel plate 2. The nearby ground is cut off. As a result, the ground near the tip of the protective steel plate 2 during the towing is always cut into a slit shape by the wire saw 10. Accordingly, the protective steel plate 2 is pulled into the slit-shaped cut portion and smoothly inserted into the ground.
[0016]
3A and 3B show a second embodiment of the insertion method, wherein FIG. 3A is a horizontal sectional view and FIG. 3B is a vertical sectional view. In this embodiment, protrusions 15 are provided on both sides of the distal end of the protective steel plate 2, and the driven pulley 7 is attached to the protrusions 15. The plurality of adjustment driven pulleys 8 and drive pulleys 9 are provided on the reaching shaft 5 and outside thereof. According to this embodiment also, the ground near the tip of the protective steel plate 2 is constantly cut into a slit shape by the wire saw 10 while the protective steel plate 2 is being pulled.
[0017]
The insertion method shown in each of the above embodiments is a method of inserting one protective steel plate 2 having a required area into the ground as one sheet. In this case, depending on the condition of the ground, there is a possibility that the ground portion in contact with the protective steel plate 2 is dragged along with the pulling of the protective steel plate 2 to cause deformation. FIGS. 4A and 4B show a third embodiment of an insertion method for coping with such ground deformation, wherein FIG. 4A is a horizontal sectional view and FIG. 4B is a vertical sectional view.
[0018]
In this embodiment, the protective steel plate 2 is composed of a plurality of divided steel plates 2a divided along the direction of insertion into the ground, and the front end of each of the divided steel plates 2a has a box-shaped case member having an entrance at the rear end side. 16 are stored. The driven pulley 7 is attached to projections 15 provided on both sides of the distal end of the case member 16. A plurality of adjustment driven pulleys 8 and drive pulleys 9 are provided outside the reaching shaft 5 and outside thereof, as in the second embodiment shown in FIG. Further, the pulling wire rope 13 is fixed to the tip of the case member 16. The plurality of adjustment driven pulleys 8 and drive pulleys 9 may be provided outside the start shaft 4 and the shaft thereof, similarly to the second embodiment shown in FIG.
[0019]
According to this embodiment, the case member 16 is towed at a predetermined distance without the split steel plate 2a coming out, and the ground near the tip of the case member 16 is cut into a slit shape with the towing. When the towing of the case member 16 is stopped, the divided steel plates 2a are sequentially pushed into the case member 16 one by one by a propulsion device (not shown) installed in the starting shaft 4. That is, by repeatedly pulling the case member 16 and pushing the split steel plate 2a, each split steel plate 2a is inserted into the ground. As described above, the protective steel plate 2 is divided and sequentially inserted into the ground as the divided steel plate 2a, so that the area in contact with the ground at the time of insertion is small, the ground portion is not dragged, and the deformation is prevented. Can be.
[0020]
Each of the above embodiments is directed to the case where the horizontally oriented protective steel plate 2 is inserted into the ground. However, the case where the vertically oriented protective steel plate 2 is inserted into the ground is substantially the same as described above except that the direction of the wire saw 10 and the like is different. It can be inserted while cutting the ground. The protective plate is not limited to a steel plate, but may be a precast concrete plate or the like.
[0021]
【The invention's effect】
As described above, according to the present invention, while cutting the ground near the tip of the protection plate with a flexible cutting tool such as a wire saw, the protection plate is inserted into the cut portion. When constructing a tunnel, it is possible to increase the degree of freedom in tunnel design by reducing the earth covering. In addition, deformation of the ground can be suppressed.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view along a traveling path such as a track or a road, showing an example of an insertion form of a protection plate.
2A and 2B show a first embodiment of an insertion method, wherein FIG. 2A is a horizontal sectional view and FIG. 2B is a vertical sectional view.
3A and 3B show a second embodiment of the insertion method, wherein FIG. 3A is a horizontal sectional view and FIG. 3B is a vertical sectional view.
4A and 4B show a third embodiment of the insertion method, wherein FIG. 4A is a horizontal sectional view and FIG. 4B is a vertical sectional view.
[Explanation of symbols]
1: tunnel cross section 2: protective steel plate 2a: split steel plate 3: running path 4: starting shaft 5: reaching shaft 6: guide tube 7: driven pulley 8: adjustment driven pulley 9: driving pulley 10: wire saw 11: reaction wall 12: Towing jack 13: Towing wire rope

Claims (4)

A method of protecting the ground by inserting a protective plate having rigidity into the ground below the vehicle traveling path,
Ground protection near the tip of the protection plate is horizontally cut by a flexible cutting tool such as a wire saw while simultaneously inserting the protection plate into the cut portion. Construction method. The method according to claim 1, wherein the flexible cutting tool and the protection plate are pulled from a reaching side of the protection plate. A method of protecting the ground by inserting a protective plate having rigidity into the ground below the vehicle traveling path,
A pair of guide pipes is installed in the ground between the start side and the arrival side of the protection plate, and the pair of guide pipes attached to the driving pulley provided on the start side or the arrival side and the tip of the protection plate. A flexible cutting tool such as a wire saw is endlessly wound around a driven pulley that moves in the guide tube of
By circulating the flexible cutting tool by driving the driving pulley, the ground between the guide pipes is horizontally cut while simultaneously inserting the protection plate into the cut portion. Protection method under the road where the vehicle runs. The protection plate is divided into a plurality of parts along the insertion direction, and the front ends thereof are stored in a box-shaped case member having an entrance at the rear end side, and the driven pulley is attached to the front end of the case member. 4. The method for protecting the ground below a vehicle traveling road according to claim 3, wherein

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