JP4987802B2 - Tunnel method for constructing lining back cushioning layer - Google Patents

Description

  The present invention relates to a tunnel method for constructing a lining back cushioning material layer.

In mountain tunnels that have been built up to now, concrete linings can be destroyed during large earthquakes such as the Niigata Chuetsu earthquake.
By the way, conventionally, the following tunnel construction method has been proposed.
(1) In the method of constructing MenShinkabe tunnel, when applied to existing tunnel, the base machine having a chain saw type cutter inserted into the ground, rotates the cutter chain, cutting the soil, solidifying solution and cutting soil By stirring and mixing, or by sequentially moving in the horizontal direction and continuing excavation, a seismic isolation wall having a constant thickness is built in the ground (see Patent Document 1 below).

  (2) Covering the concrete inner wall surface of the tunnel with a waterproof sheet, driving anchor bolts from the outside via a washer, and screwing the nut into the screw part of the bolt to press and fix the waterproof sheet to the concrete inner wall surface. . Cover the outside of the waterproof sheet in layers with a heat insulating material, and screw the nut through the washer to the threaded tip end side of the anchor bolt that protrudes outside the mesh through the heat insulating material. Press and fix the mesh. The outside is coated with a cement composition (see Patent Document 2 below).

(3) A water-cushioning material is fixed to the primary concrete or ground wall of the tunnel with a nail or an adhesive, and a nonwoven fabric is fixed to the water-cushioning material by a locking material or fusion. The lining concrete was placed so as to be interposed (see Patent Document 3 below).
In this way, as a special application, a tunnel is provided with a seismic isolation wall or a heat insulating material interposed.
JP 2006-112182 A Japanese Patent Laid-Open No. 08-232591 Japanese Patent Laid-Open No. 06-288198

However, in particular, in the case of a mountain tunnel constructed by leaving a natural ground without a conventional buffer, if there is no buffer, as shown in FIG. 5, the concrete lining 102 ( There is a problem that the ground wall of the mountain tunnel is destroyed due to the collapse of the ground wall) and the concentration of cracks.
In view of the above situation, the present invention constructs a lining back cushioning layer that can protect the lining by absorbing the deformation from the ground due to the earthquake by constructing the cushioning layer on the lining back. The purpose is to provide a tunnel method.

In order to achieve the above object, the present invention provides
[1] In a tunnel construction method in which a lining back cushioning material layer is constructed on the reverse side of a mountain tunnel lining, the covering is provided on the inner side of a steel support through a vinyl chloride sheet layer. A back cushioning layer is provided, a waterproof sheet layer is provided on the inside of the lining back cushioning layer, and the lining is built on the inside .

[ 2 ] In the tunnel method for constructing the lining back cushioning material layer according to [1], the vinyl chloride sheet layer, the lining backing cushioning material layer, and the waterproof sheet layer are fused to the steel support. It is characterized in that it is fastened by a bolt fixed to the hanging rebar fitting and a nut screwed into this bolt.

  ADVANTAGE OF THE INVENTION According to this invention, by applying a buffer material layer to a lining back, the deformation from the ground accompanying an earthquake can be absorbed and a lining can be protected.

The tunnel construction method for constructing the lining back cushioning layer of the present invention is to provide the lining backing cushioning layer through a vinyl chloride sheet layer inside the steel support, and inside the lining backing cushioning layer. A waterproof sheet layer is applied to the lining, and the lining is built on the inside .

Hereinafter, embodiments of the present invention will be described in detail.
FIG. 1 is a view showing a tunnel construction method in which a lining back cushioning material layer showing a reference example of the present invention is constructed.
In this figure, mountain tunnels, trajectory 1, railway vehicle 2, lining 3 of tunnels, lining backing buffer material layer 4 to be applied to the lining 3 of that consists of ground 5.
Thus, since it comprised so that the lining back buffer material layer 4 might be given, since the lining back buffer material layer 4 absorbs the deformation | transformation from the ground 5 effectively also at the time of an earthquake, destruction of the lining 3 Can be prevented.

FIG. 2 is a schematic view showing an example of a tunnel construction method in which a lining back cushioning material layer according to an embodiment of the present invention is constructed, and FIG. 3 is a diagram showing a specific example of the tunnel construction method.
In these drawings, a suspended reinforcing bar 12 is fused inside a steel support 11, and a bolt 13 with a male screw is fixed to the suspended reinforcing bar 12 via a washer 14. Further, a vinyl chloride sheet (band iron stopper) layer 15 is provided inside the steel support 11. A double-sided tape 16 is affixed to the vinyl chloride sheet layer 15, and a lining back cushioning material (styrene foam) layer 17 is provided on the double-sided tape 16, and the inside of the lining back cushioning material layer 17 is waterproof. A sheet layer 18 is arranged, and these are fastened to the steel support 11 by a nut 21 via a butyl tape washer 19 and a flat washer 20 at the tip of a bolt 13 with a male screw, and finally cover the nut 21. Thus, a lock bolt cover 22 is provided . This Kodewa, lining backing cushioning material as a (foam) layer 17, Ru Tei stuck in units of one dimension of the vertical 500 mm × horizontal 1000mm inside the steel支保Engineering 11 [see FIG. 2 (b)]. In addition, 10 is an outer ground, 23 is an inner (track side) lining (concrete).

In this manner, the lining back cushioning material (styrene foam) layer 17 is constructed on the inner side of the steel support 11 and the lining is built on the inner side.
FIG. 4 is a diagram comparing the lining state after a simulation test when the conventional tunnel method and the tunnel method of the present invention are applied. FIG. 4 (a) shows the case of the conventional tunnel method and FIG. 4 (b). Shows the case of the tunnel construction method of the present invention.

According to FIG. 4 (a), in the conventional tunnel 30, peeling is observed at many parts of the lining, but according to FIG. 4 (b), peeling is seen in the lining in the tunnel 31 of the present invention. I can't accept it.
In addition, this invention is not limited to the said Example, Based on the meaning of this invention, a various deformation | transformation is possible and these are not excluded from the scope of the present invention.

  The tunnel method for constructing the lining back cushioning material layer of the present invention can be used as a tunnel method for preventing destruction of the mountain tunnel lining.

It is a figure which shows the tunnel construction method which constructed the lining back buffer material layer which shows the reference example of this invention. It is a schematic diagram which shows an example of the tunnel construction method which constructed the lining back buffer material layer which shows the Example of this invention. It is a figure which shows the specific example of the tunnel construction method which constructed the lining back buffer material layer which shows the Example of this invention. It is the figure which compared the lining state after the simulation experiment at the time of giving the conventional tunnel method and the tunnel method of this invention. It is a schematic diagram of the problem by the conventional tunnel construction method.

DESCRIPTION OF SYMBOLS 1 Track | truck 2 Railway vehicle 3 Tunnel lining 4 Back lining cushioning material layer 5 Ground 10 Outer ground 11 Steel support 12 Suspension reinforcement 13 Male screw bolt 14 Washer 15 Vinyl chloride sheet layer 16 Double-sided tape 17 Cover Back cushioning layer (Styrofoam) layer 18 Waterproof sheet layer 19 Butyl tape washer 20 Flat washer 21 Nut 22 Lock bolt cover 23 Inner (track side) lining (concrete)
30 Conventional tunnel 31 Tunnel of the present invention

Claims (2)

In the tunnel method of constructing a lining back cushioning material layer on the reverse side of the mountain tunnel lining, the above lining back cushioning is provided via a vinyl chloride sheet layer inside the steel support. A tunneling method for constructing a lining back buffer material layer, comprising providing a material layer, applying a waterproof sheet layer inside the lining back buffer material layer, and constructing the lining on the inside .   The tunnel construction method for constructing the lining back cushioning material layer according to claim 1, wherein the vinyl chloride sheet layer, the lining backing cushioning material layer, and the waterproof sheet layer are attached to a suspended rebar fitting fused to the steel support. A tunneling method for constructing a lining back cushioning material layer characterized by being fastened by a bolt to be fixed and a nut screwed to the bolt.

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