JP2013245514A - Heat insulating material construction method for tunnel inner wall surface - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily and simply carry out heat insulating material construction for a tunnel inner wall surface without worsening tunnel interior environment.SOLUTION: By using a movable form device 10 provided on a carriage 11 movable in tunnel extension direction and having a form member 12 corresponding to a tunnel inner wall surface, a heat insulating material 30 having flowability and solidifying after a lapse of a predetermined time is injected into between a waterproof sheet 20 spread on the inner peripheral side of tunnel primary lining and the form member 12, and the heat insulating material 30 is thus constructed on the tunnel inner wall surface.

Description

  The present invention relates to a heat insulating material construction method for a tunnel inner wall surface. Specifically, in a mountain tunnel in a cold region, it is possible to construct a heat insulating material on a tunnel inner wall surface by using an existing mobile formwork. It is about the method.

  When newly installing a mountain tunnel in a cold region, it is common to install a heat insulating material on the inner wall surface of the tunnel to prevent cracking or falling off of the lining concrete due to freezing. In other words, in mountainous Tonellu in cold regions, freezing and thawing may be repeated in the ground on the backside of the lining, which may cause cracking and water leakage of the lining concrete due to frost heave and reduce the durability of the lining concrete. There is.

  Conventionally, in such a mountain tunnel in a cold region, a heat insulating material has been applied to the back surface of the lining by spreading a plate-shaped heat insulating material on the inner wall surface of the tunnel or spraying a urethane foam heat insulating material. As a technique for constructing a heat insulating material on a tunnel inner wall surface, for example, there is one described in Patent Document 1.

  In the technique described in Patent Document 1, a concrete inner wall surface of a tunnel is covered with a waterproof sheet, an anchor bolt is driven from the outside through a washer, and a nut is attached to a screw portion of the bolt to attach the waterproof sheet to the concrete. Press and fix to the inner wall. Then, the outer surface of the waterproof sheet is covered with a net-like body in a layered manner via a heat insulating material, and a nut is attached to the tip end side of the threaded portion of the anchor bolt protruding outside the net-like body via the heat insulating material via a washer And the net-like body are pressed and fixed, and the outside is covered with a cement composition.

JP-A-8-232591

  However, in the work of spreading a plate-like heat insulating material on the inner wall surface of the tunnel, there is a problem that the heat insulating material has to be manually attached, which takes time and increases the construction period. Also, when installing insulation by spraying urethane foam, the blasting environment will deteriorate, such as the spraying material splashing into the air and adhering to workers and work vehicles. There was a problem that work efficiency could not be achieved because work could not be performed.

  Moreover, the urethane foam heat insulating material is a combustible material, and in order to prevent a mine fire due to ignition, it is necessary to perform a surface fire-proofing treatment in the entire construction section of the heat insulating material. In this surface fire prevention treatment, it is common to spray dry mortar for adhering rock bolts to the surface of the heat insulating material. The dry mortar spraying operation for the surface fire prevention treatment also has the same problem as the above-described heat insulating material spraying operation.

  Furthermore, for safety management, it is preferable to carry out the fire prevention treatment immediately after spraying the heat insulating material, but the current situation is that it is carried out collectively after the construction of the heat insulating material section is completed due to work setup etc. .

  This invention is proposed in view of the situation mentioned above, and it aims at providing the method which can perform the heat insulating material construction to a tunnel inner wall surface easily and simply, without deteriorating a mine environment. . Moreover, an object of this invention is to provide the method of performing the surface fire prevention process of a heat insulating material simultaneously with the heat insulating material construction to a tunnel inner wall surface.

  In order to achieve the above-mentioned object, the method of constructing a heat insulating material on the inner wall surface of the present invention is provided on a carriage that is movable in the direction of extension of the tunnel and has a formwork member corresponding to the inner wall surface of the tunnel. A heat insulating material is constructed using a formwork device. In this heat insulating material construction method, a heat insulating material that has fluidity and solidifies after a predetermined time has passed between the waterproof sheet spread on the inner peripheral side of the primary lining of the tunnel and the formwork member. In addition, it is characterized by constructing a heat insulating material on the inner wall surface of the tunnel. In addition, the backfilling filler is filled between the primary lining and the waterproof sheet.

  In addition, a sheet-like flame retardant coating material is attached to the outer peripheral surface of the formwork member, and between the waterproof sheet spread on the inner peripheral side of the primary lining of the tunnel and the flame retardant coating material. It is possible to inject insulation.

  The method for constructing a heat insulating material on the inner wall surface of the tunnel of the present invention requires a new device to construct the heat insulating material on the inner wall surface of the tunnel using a general mobile formwork device as a device for tunnel lining. do not do. In addition, the work efficiency is improved as compared with the case where the plate-like heat insulating material is manually spread, and the construction period can be shortened. Furthermore, since the spraying operation of the heat insulating material is not performed, the underground environment is not deteriorated, and the heat insulating material can be applied in parallel with other operations.

  As described above, according to the heat insulating material construction method for a tunnel inner wall surface according to the present invention, it is possible to easily and efficiently perform the heat insulation material construction work on the tunnel inner wall surface without deteriorating the underground environment. Can also contribute to the reduction of

  In addition, a sheet-like flame retardant coating material is attached to the outer peripheral surface of the formwork member, and by injecting a heat insulating material between the waterproof sheet and the flame retardant coating material, heat insulation is performed simultaneously with the construction of the heat insulating material. It becomes possible to perform a surface fireproofing treatment of the material. For this reason, work efficiency can be improved and safety can be improved in fire prevention measures.

The cross-sectional view of the mobile formwork apparatus used for the heat insulating material construction method to the inner wall surface of the tunnel which concerns on embodiment of this invention. Explanatory drawing of the heat insulating material construction method to the tunnel inner wall surface which concerns on embodiment of this invention.

  Hereinafter, with reference to the drawings, an embodiment of a heat insulating material construction method for a tunnel inner wall according to the present invention will be described. 1 and 2 show a method for constructing a heat insulating material on a tunnel inner wall according to an embodiment of the present invention. FIG. 1 is a cross-sectional view of a mobile formwork apparatus, and FIG. FIG.

<Outline of heat insulation material construction method on tunnel inner wall>
As shown in FIGS. 1 and 2, the method for constructing a heat insulating material on the inner wall surface of the tunnel according to the embodiment of the present invention includes a waterproof sheet 20 spread on the inner peripheral side of the primary lining of the tunnel, and a mobile type A heat insulating material 30 having fluidity and solidifying after a predetermined time has passed between the mold member 12 of the mold apparatus 10 and the heat insulating material 30 is applied to the inner wall surface of the tunnel.

<Moveable formwork device>
The mobile formwork apparatus 10 used in the method for constructing a heat insulating material on the inner wall surface of the tunnel according to the present embodiment is an application of a generally used apparatus called a centle (slide form). As shown in FIG. 2, the mold member 12 is provided that is movable in the extending direction of the tunnel in an arch shape that matches the inner wall surface of the tunnel. This mobile formwork apparatus 10 includes a carriage 11 placed on a pair of rails 50, a formwork member 12 corresponding to the hollow cross-sectional shape in the tunnel, and an injection device for a heat insulating material 30 (for example, a urethane foam heat insulating material). (Injection tube and pumping device) and the like.

<Formwork member>
As shown in FIG. 1, the mold member 12 of the present embodiment is a member for constructing the heat insulating material 30 corresponding to the inner wall surface of the tunnel, and is made of a steel plate material corresponding to the hollow cross-sectional shape in the tunnel. Become.

<Insulation construction>
In the method for applying a heat insulating material to the inner wall surface of the tunnel according to the present embodiment, although not shown, first, concrete is blown onto the tunnel ground and a primary lining is applied, and a waterproof sheet 20 is provided on the inner peripheral side of the primary lining. The backfilling filler is filled between the primary lining and the waterproof sheet 20. Under the present circumstances, it is preferable to use the smoothing construction method of the waterproof sheet 20 explained in full detail later.

  And as shown in FIG. 2, the heat insulating material 30 which consists of urethane foam etc. is inject | poured between the waterproof sheet 20 and the formwork member 12, and the heat insulating material 30 is constructed to a tunnel inner wall surface. Any material may be used for the heat insulating material 30 as long as it has fluidity, solidifies after a predetermined time, and has heat insulating properties after solidification.

<Construction of flame retardant coating material>
In addition, as shown in FIG. 2, a sheet-like flame retardant coating material 40 is attached to the outer peripheral surface of the mold member 12, and the heat insulating material 30 is injected between the waterproof sheet 20 and the mold member 12. Is preferred. For example, a polycarbonate resin sheet can be used as the flame-retardant coating material 40, but any material may be used as long as it is a sheet-like member having flame retardancy.

  Thus, by attaching the sheet-like flame retardant coating material 40 to the outer peripheral surface of the mold member 12, not only can the surface fire prevention treatment of the heat insulating material 30 be performed simultaneously with the construction of the heat insulating material 30, Edge cutting (isolation) between the outer peripheral surface of the mold member 12 and the heat insulating material 30 can be performed.

<Construction of waterproof sheet>
In a general construction method of the waterproof sheet 20, the waterproof sheet 20 may be loosened and a gap may remain between the inner peripheral surface of the primary lining and the waterproof sheet 20. For this reason, groundwater tends to accumulate in the voids, and the waterproof sheet 20 may be damaged due to freezing of the groundwater. In order to cope with such inconvenience, a method for smoothing the waterproof sheet 20 has been developed. In the method for applying a heat insulating material to the inner wall surface of the tunnel according to the present embodiment, the technique is applied when the waterproof sheet 20 is applied. It is preferable to use it. A method and apparatus for filling a filler between the waterproof sheet 20 and the primary lining using such a movable mold is described in detail in Japanese Patent No. 4044719.

DESCRIPTION OF SYMBOLS 10 Mobile formwork apparatus 11 Carriage 12 Formwork member 20 Waterproof sheet 30 Heat insulating material 40 Flame retardant coating material 50 Rail

Claims (2)

It is a method for constructing a heat insulating material on the inner wall surface of a tunnel,
Using a movable formwork device provided on a carriage movable in the extension direction of the tunnel and having a formwork member corresponding to the inner wall surface of the tunnel,
The inner wall surface of the tunnel is injected with a heat insulating material that has fluidity and solidifies after a predetermined time has passed between the waterproof sheet spread on the inner peripheral side of the primary lining of the tunnel and the mold member. A method for constructing a heat insulating material on the inner wall surface of a tunnel, characterized by constructing a heat insulating material on the wall.   A sheet-like flame-retardant coating material is attached to the outer peripheral surface of the formwork member, and between the waterproof sheet stretched on the inner peripheral side of the primary lining of the tunnel and the flame-retardant coating material The said heat insulating material is inject | poured, The heat insulating material construction method to the tunnel inner wall surface of Claim 1 characterized by the above-mentioned.

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