JP4019124B2 - Expanded type simple liner - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a diameter-expanded simple liner, and more particularly to a technique for improving the diameter expansion method of this type of liner.
[0002]
[Prior art]
The tunnel construction method using a tunnel boring machine (hereinafter abbreviated as TBM) is used for, for example, excavation of advanced conductors. Unlike the shield method, the basic principle is to secure the excavation reaction force from the ground. It is said.
[0003]
Also, when constructing tunnels with the TBM method, most of them are mountain tunnels, and since the support effect of the natural ground itself can be expected, and there is little damage to the natural ground like blasting excavation, Depending on the nature of the natural ground, it can be relatively light.
[0004]
However, in the TBM method, since the excavation speed is high, the support operation has a greater influence on the entire excavation cycle than the excavation speed. Therefore, a support structure that is as simple as possible is required.
[0005]
In order to meet such a demand, for example, Japanese Patent Laid-Open No. 9-125887 proposes a diameter-expanded simple liner that can be easily assembled and disassembled. The diameter-expanded simple liner proposed in this publication is provided with expansion / contraction means for expanding and contracting a part of the connecting portion of the liner piece member assembled in an annular shape.
[0006]
However, such conventional diameter-expanded simple liners have the following technical problems.
[0007]
[Problems to be solved by the invention]
That is, the diameter-expanded simple liner disclosed in the above publication has all the liner pieces formed in the same shape and can be assembled and disassembled easily and quickly. A jack is used, and the diameter of the liner piece assembled in an annular shape is increased by operating the jack.
[0008]
However, in such a diameter expansion mechanism, the structure of the liner piece is complicated, and a special means is required for the diameter expansion, and there is room for improvement in the diameter expansion mechanism of the simple liner.
[0009]
The present invention has been made in view of such conventional problems, and an object of the present invention is to avoid the complication of the diameter expansion structure and require special means for the diameter expansion operation. An object of the present invention is to provide a simple diameter expansion type liner.
[0010]
[Means for Solving the Problems]
In order to achieve the above object, according to the present invention, there is provided a simple liner that is sequentially and annularly assembled on the rear side of the tunnel excavator as the tunnel excavator is excavated. The diameter was expanded toward the natural ground side under the pressure of.
According to the diameter expansion type simple liner configured in this way, the simple liner assembled in an annular shape receives the pressing force of the shield jack of the tunnel excavator and expands toward the natural ground side. There is no need to provide a special diameter expanding means.
The simple liner includes a wedge-shaped liner piece that is press-fitted toward the wellhead by the pressing force of the shield jack between liner pieces assembled in an annular shape, and the simple liner is brought to the ground side by the wedge effect of the liner piece. The diameter can be increased.
According to this configuration, when the wedge-shaped liner piece is press-fitted toward the wellhead side, a slight gap is generated between the liner pieces assembled in an annular shape due to the wedge effect of the liner piece. The diameter expands toward the natural mountain side.
The simple liner includes a wedge-shaped first liner piece whose side width decreases from the face side toward the wellhead side, and a reverse wedge-shaped second liner piece that mutually engages the side surface of the first liner piece, The diameter of the simple liner can be increased by press-fitting the projecting end of the first liner piece toward the wellhead by the pressing force of the shield jack.
According to this configuration, when the wedge-shaped first liner piece whose side surface width is reduced from the face side toward the wellhead side is press-fitted toward the wellhead side, the simple liner assembled in an annular shape by the wedge effect of the first liner piece. Expands in diameter.
The pressing force of the shield jack is sequentially transmitted between the annularly assembled simple liners from the face side to the wellhead side, and the simple liners are in close contact with the ground from the wellhead side by the transmitted pressure. Can be made.
According to this configuration, since the simple liner is in close contact with the natural ground in order from the wellhead side, the simple liner can be used for assisting the gripper reaction force during TBM excavation and for assisting the reaction force of the tunnel excavator.
The first liner piece can be formed in a substantially trapezoidal shape.
The engaging surfaces of the first and second liner pieces can be provided with concave and convex fitting portions.
According to this configuration, the engagement state between the liner pieces is kept good, and the first liner piece can be smoothly moved by the pressing force of the shield jack, and the wedge effect can be surely exhibited.
When the simple liner is assembled in an annular shape, an uneven fitting portion can be provided between end faces adjacent to each other in the tunnel axis direction.
According to this configuration, the pressing force of the shield jack can be reliably transmitted between the simple liners assembled in an annular shape.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described in detail with reference to the accompanying drawings. 1 to 3 show an embodiment of a diameter-expanded simple liner according to the present invention.
[0012]
FIG. 1 is an overall view of a tunnel digging machine using a diameter-expanded simple liner of the present invention, and shows a shield type double gripper TBM machine.
[0013]
The TBM machine shown in FIG. 1 includes a main body unit 10, and the main body unit 10 includes a front body unit 11 and two independent first and second rear body units 12 and 13. A cutter head 15 for excavating natural ground is disposed at the front end of the front trunk portion 11.
[0014]
Further, the front trunk 11 is provided with a front gripper 16 that expands and contracts toward the excavated natural ground wall and a drive motor (not shown) that rotationally drives the cutter head 15.
[0015]
The front gripper 16 includes a plurality of jacks arranged at predetermined intervals along the circumferential direction, and includes a jack that expands and contracts the gripper plate toward the drilled pit wall side, and controls the pressure of the jack. An electromagnetic relief valve is provided.
[0016]
The two independent first and second rear trunk parts 12 and 13 are independent of taking a reaction force by abutting the inner surface of the well wall and pressing it when excavating the natural ground with the cutter head 15. Two extendable first and second main grippers 17 and 18 are provided.
[0017]
Like the front gripper 16, the first and second main grippers 17 and 18 have built-in jacks for extending and contracting the gripper plate toward the excavated pit wall side, and control the pressure of each jack. First and second electromagnetic relief valves are provided.
[0018]
Further, at the rear end of the second rear body portion 13, when the ground is bad, a shield shank 21 for digging the main body portion 10 by taking a reaction force on the diameter-expanded simple liner 30 installed at the rear thereof. In this embodiment, the shield jack 21 is also used for the diameter expansion operation of the simple liner 30.
[0019]
Between the front body part 11 and the first rear body part 12, a first thrust jack 19 for moving the front body part 11 forward is provided, and between the front body part 11 and the second rear body part 13, A second thrust jack 20 for advancing the front body portion 11 is provided.
[0020]
As shown in detail in FIGS. 2 and 3, the enlarged diameter simple liner 30 includes a first liner piece 30 a and a second liner piece 30 b assembled in an annular shape.
[0021]
In the case of the present embodiment, each of the liner pieces 30a and 30b is formed in a curved shape obtained by dividing a circle into six equal parts, and the first liner piece 30a has a side width from the face side to the wellhead side. It has a trapezoidal shape that gradually decreases, and is formed in a wedge shape.
[0022]
On the other hand, the second liner piece 30b has a reverse wedge-like trapezoidal shape in which the width of the side surface gradually decreases from the wellhead side to the face side, contrary to the first liner piece 30a. The first and second liner pieces 30a and 30b thus configured are alternately arranged along the circumferential direction, and are assembled in an annular shape so that the side surfaces of the adjacent liner pieces 30a and 30b engage with each other. It is done.
[0023]
In the case of the present embodiment, as shown in FIG. 3 in which the first and second liner pieces 30a and 30b are annularly assembled, in the ring portions along the tunnel axis direction, they are almost at the same position. However, the positions of the first and second liner pieces 30a and 30b can be assembled in the circumferential direction so as to be shifted between the rings.
[0024]
The engaging surface between the first and second liner pieces 30a, 30b is provided with an uneven fitting portion 32, respectively. In the illustrated embodiment, the concave / convex fitting portion 32 includes a V-shaped groove 32a and a V-shaped protrusion 32b.
[0025]
The V-shaped groove 32a is provided on the entire outer peripheral edge of the first liner piece 30a, and the V-shaped protrusion 32b that fits with the V-shaped groove 32a is provided on the entire outer peripheral edge of the second liner piece 30b.
[0026]
Note that the arrangement relationship between the V-shaped groove 32a and the V-shaped protrusion 32b may be provided in any of the first and second liner pieces 30a and 30b as long as they can be fitted to each other. That is, for example, the V-shaped protrusions 32b are provided on both side surfaces of the first liner piece 30a, and the V-shaped grooves 32a are provided on the front and rear surfaces of the first liner piece 30a, or on the entire outer periphery of the first liner piece 30a. For example, a V-shaped protrusion 32b may be provided.
[0027]
In the simple liner 30 provided with the concave-convex fitting portion 32 in such a state, when the first and second liner pieces 30a and 30b are alternately arranged and assembled in an annular shape, the first and second liner pieces 30a and 30b are adjacent to each other in the circumferential direction. The V-shaped groove 32a and the V-shaped projection 32b are fitted on the engagement surface between the first and second liner pieces 30a and 30b, and the simple liners 30 assembled in an annular shape are adjacent to each other in the axial direction. The V-shaped groove 32a and the V-shaped protrusion 32b can be fitted.
[0028]
When the first and second liner pieces 30a, 30b are assembled in an annular shape, as shown in FIG. 3, the first liner pieces 30a are assembled so as to protrude toward the face.
[0029]
The assembly of the liner pieces 30a and 30b is performed on the rear end side of the second rear trunk portion 13, and when the assembly is finished, the protruding end of the first liner piece 30a is moved to the wellhead side using the shield jack 21. Press.
[0030]
For this pressing, for example, as shown in FIG. 3, an annular pressing ring 34 is placed in contact with the protruding end of the first liner piece 30 a, and the shield jack 21 is brought into contact with the pressing ring 34.
[0031]
When the first liner piece 30a is pressed to the wellhead side by the shield jack 21, the side width of the first liner piece 30a is a wedge-shaped trapezoid that gradually decreases from the face side to the wellhead side. The liner piece 30a is press-fitted between the second runner pieces 30b so as to push the second liner piece 30b adjacent in the circumferential direction in the circumferential direction.
[0032]
When the first liner piece 30a is press-fitted in this way, due to the wedge effect of the liner piece 30a, the simple liner 30 assembled in an annular shape expands toward the excavated wall surface.
[0033]
At this time, in the case of the present embodiment, since the concave and convex fitting portions 32 are provided on the engaging surfaces of the first and second liner pieces 30a and 30b, the liner pieces 30a are formed by the fitting portions 32. , 30b, the first liner piece 30a can be smoothly moved by the pressing force of the shield jack 21 while maintaining a good engagement state between them, and the wedge effect can be reliably exhibited.
[0034]
As the TBM machine advances, the simple liners 30 are sequentially assembled into an annular shape, and when the first liner piece 30a is pressed toward the wellhead by the shield jack 21, the pressing force of the shield jack 21 is assembled into an annular shape. The simple liner 30 is sequentially transmitted from the face side to the wellhead side between the formed simple liners 30, and the simple liner 30 is further expanded in diameter by the transmitted pressing force, and is in close contact with the natural ground sequentially excavated from the wellhead side portion. .
[0035]
If the simple liner 30 is brought into close contact with the natural ground in this order from the wellhead side in this way, it can be used for assisting the gripper reaction force during TBM excavation and for assisting reaction force of the tunnel excavator.
[0036]
At this time, in the case of the present embodiment, when the simple liner 30 is assembled in an annular shape, the concave and convex fitting portions 32 are provided between the end surfaces adjacent to each other in the tunnel axis direction. The pressing force of the shield jack 21 can be reliably transmitted between the simple liners 30 that are assembled in an annular shape.
[0037]
Now, according to the diameter-expanded simple liner 30 configured as described above, the simple liner 30 assembled in an annular shape receives the pressing force of the shield jack 21 of the TBM machine and expands toward the natural ground side. It is not necessary to perform a large diameter expansion operation, and it is not necessary to provide special diameter expansion means on the liner pieces 30a and 30b.
[0038]
For this reason, the structure of the liner pieces 30a and 30b constituting the simple liner 30 is simplified, and the construction efficiency is improved. Moreover, since the diameter-expanded simple liner 30 is assembled in the rear trunk portion 13 of the TBM machine, the safety of the assembling work is also improved.
[0039]
The simple liner 30 shown in the above embodiment is not limited to the shape described above. For example, a plurality of liner pieces are assembled in an annular shape, and a wedge-shaped liner piece is press-fitted into a connecting portion between the liner pieces. In this case, the wedge-shaped liner piece is press-fitted to cause a slight gap between the annularly assembled liner pieces, but there is no practical problem.
[0040]
【The invention's effect】
As described above in detail in Examples and Experimental Examples, according to the diameter-expanded simple liner according to the present invention, it is not necessary to perform a special diameter-expansion operation, and a special diameter-expanding means is provided in the liner. Since it is not necessary, the structure is simplified and the construction efficiency is improved.
[Brief description of the drawings]
FIG. 1 is an overall explanatory view showing an example of a TBM machine using a diameter-expanded simple liner according to the present invention.
FIG. 2 is a front view of an assembled state of the enlarged diameter simple liner of the present invention.
FIG. 3 is an explanatory plan view of the assembled state of the diameter-expanded simple liner of the present invention.
[Explanation of symbols]
21 Shield jack 30 Expanded type simple liner 30a First liner piece 30b Second liner piece 32 Fitting portion 32a V-shaped groove 32b V-shaped projection

Claims (7)

In the simple liner that is sequentially assembled in an annular manner on the rear side of the tunnel excavator, along with the excavation of the tunnel excavator,
The simplified liner is a diameter-expanded simple liner that expands toward the natural ground side by receiving the pressing force of the shield jack of the tunnel machine. The simple liner includes a wedge-shaped liner piece that is press-fitted toward the wellhead side by the pressing force of the shield jack between liner pieces assembled in an annular shape,
The diameter-expanded simple liner according to claim 1, wherein the diameter of the simple liner is increased toward the natural mountain side by the wedge effect of the liner piece. The simple liner includes a wedge-shaped first liner piece whose side width decreases from the face side toward the wellhead side, and a reverse wedge-shaped second liner piece that mutually engages the side surface of the first liner piece,
2. The diameter-expanding simple type according to claim 1, wherein the diameter of the simple liner is increased by press-fitting a protruding end of the first liner piece on a face side toward a wellhead side by a pressing force of the shield jack. liner.   The pressing force of the shield jack is sequentially transmitted between the annularly assembled simple liners from the face side to the wellhead side, and the simple liners are sequentially transferred from the wellhead side to the ground by the transmitted pressure force. The diameter-expanded simple liner according to any one of claims 1 to 3, wherein the liner is closely attached.   The diameter-expanded simple liner according to any one of claims 1 to 4, wherein the first liner piece is formed in a substantially trapezoidal shape. The diameter-expanded simple liner according to any one of claims 1 to 5, wherein a concave-convex fitting portion is provided on the engagement surface of the first and second liner pieces .   The diameter expansion according to any one of claims 1 to 6, wherein when the simple liner is assembled in an annular shape, an uneven fitting portion is provided between end faces adjacent to each other in the tunnel axis direction. Formula simple liner.

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