JPH08232591A - Tunnel freezing preventive method - Google Patents

Abstract

PURPOSE: To take measures to a leak tunnel in a cold weather district where waterproofness and insulating properties are required. CONSTITUTION: A concrete interior wall surface 11 of a tunnel is coated with a waterproofing sheet 2 where an anchor bolt 6 is driven by way of a washer 8 from the outside. A nut 7 is threaded with the threaded part 61 of the bolt 6 and the waterproofing sheet 2 is pressed against and fixed with the concrete interior wall surface 11. The outside of the waterproofing sheet 2 is laminated and coated with a net-shaped article 4 through an insulating material 3 of a desired thickness. The nut 7 is engaged with the tip of the treated part of the anchor bolt 6 projecting outside the net-shaped article 4 through the washer 8, thereby pressing and fixing the insulating material 3 and the net-shaped article 4. The outside is coated with a cement composition 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tunnel antifreezing method for preventing freezing of water leaking to the inner wall surface of concrete in a tunnel.

[0002]

2. Description of the Related Art Generally, in cold regions, leaked water on the concrete inner wall surface of a tunnel freezes in the winter and forms icicles and side ice in the tunnel, which impedes traffic in the tunnel and is dangerous. There is a strong demand for prevention of freezing of the tunnel, as it will adversely affect the ancillary facilities in the tunnel and lead to destruction of the concrete inner wall surface in the long term.

Conventionally, for example, as described in Japanese Examined Patent Publication No. 2-40840, a concrete inner wall surface of a tunnel is covered with a waterproof sheet, and a metal net is pressed from the outside of the waterproof sheet with a strip steel. Secure the waterproof sheet, metal net, and steel strip to the concrete inner wall surface with the tightening metal fittings.
Covering the cement composition from the outside, using a heat insulating waterproof sheet in place of the waterproof sheet in cold regions, to prevent freezing of water leakage generated on the concrete inner wall surface,
A water guiding method is known in which water leakage is guided to a gutter at the end of a tunnel.

Further, as described in JP-A-4-166598, a waterproof sheet is attached to the concrete inner wall surface of the tunnel, and a plate-shaped heat insulating material is attached to the outer side of the waterproof sheet with an adhesive or the like. There is known a heat insulating construction method of a tunnel in which a tunnel inner wall constituent material such as a precast concrete lining plate is closely attached to the outside.

[0005]

However, in the former construction method disclosed in Japanese Examined Patent Publication No. 2-40840, since the heat insulating and waterproof sheet is used instead of the waterproof sheet, it has both heat insulating and waterproof functions, but is cold. In the ground, there is a problem that one or both of heat insulating property and waterproof property is likely to be insufficient. Moreover, the temperature inside the tunnel differs depending on the cold region where the construction is required, because it is simply attached with a predetermined heat-insulating waterproof sheet instead of the waterproof sheet, so it is not possible to adequately deal with the heat insulation at each construction site. There is a problem.

Further, in the latter method described in Japanese Patent Laid-Open No. 4-166598, the attachment of the waterproof sheet and the attachment of the heat insulating material are completely separate from each other without a common attachment member, and therefore, the workability is improved. There are inferior problems.
In addition, since the temperature inside the tunnel varies depending on the cold region that requires construction, even if you try to attach heat insulation materials of various thicknesses correspondingly, thick heat insulation materials become heavy and it is difficult to attach them stably. , There is a problem that it is easy to peel off or fall before attaching the tunnel inner wall component.

An object of the present invention is to provide a tunnel freezing prevention construction method that solves the above conventional problems.

[0008]

In order to solve the above problems, in the tunnel antifreezing method of the present invention, the concrete inner wall surface of the tunnel is covered with a waterproof sheet, and an anchor bolt is struck from the outside of the waterproof sheet to form the waterproof sheet. Of the anchor bolt is projected to the outside of the anchor bolt, and the waterproof sheet is fixed to the concrete inner wall surface by a nut screwed to the base end side of the screw portion, and the outside of the waterproof sheet has a desired thickness of heat insulating material. Through a layered body with a mesh body, the screw bolt tip end side of the anchor bolt is projected to the outside of the mesh body through a heat insulating material, the heat insulation material and the mesh body with a nut screwed to the screw thread tip side. The waterproof sheet is fixed to the outside and the outside is covered with a cement composition.

[0009]

According to the present invention, since the outer surface of the waterproof sheet covering the concrete inner wall surface of the tunnel is coated with the heat insulating material, the water leakage generated on the inner wall surface of the concrete does not freeze, which hinders the traffic in the tunnel. , It is possible to prevent the formation of ice pillars and side ice that adversely affect the ancillary facilities in the tunnel.

Also, the tip of the screw portion of the anchor bolt having the waterproof sheet fixed to the inner wall surface of concrete is projected to the outside of the mesh body through the heat insulating material, and the nut is screwed to the tip of the screw portion to form a mesh with the heat insulating material. Since the body is fixed to the outside of the waterproof sheet, it is possible to adjust the screwing position of the nut that is screwed to the tip side of the screw part of the anchor bolt with respect to the heat insulating material of various thicknesses, or the anchor that has a desired screw part length in advance. It can be easily handled by using bolts. Moreover, since the anchor bolts that fix the waterproof sheet to the inner wall surface of the concrete are used as they are to fix the heat insulating material and the mesh body to the outside of the waterproof sheet, the workability is good.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. In the drawing, 1 is a tunnel, 11 is a concrete inner wall surface of the tunnel 1, 2 is a concrete inner wall surface 11
A waterproof sheet for covering the waterproof sheet 3, a heat insulating material for covering the waterproof sheet 2, 4
Is a mesh covering the heat insulating material 3, and 5 is the waterproof sheet 2 and the heat insulating material 3.
And a cement composition covering the layer of the mesh body 4, 6 is an anchor bolt, 61 is a threaded portion of the anchor bolt 6, 7 is a nut,
8 is a washer.

In the antifreezing method of the present invention, first, the tunnel 1
The waterproof sheet 2 along the concrete inner wall surface 11 of the anchor bolt 6 from the outside of the waterproof sheet 2 through the washer 8.
Is placed on the concrete inner wall surface 11, and a screw portion 61 having a predetermined length of the anchor bolt 6 is projected to the outside of the waterproof sheet 2. The nut 7 is screwed onto the proximal end side of the screw portion 61, and the waterproof sheet 2 is pressed and fixed to the concrete inner wall surface 11 via the washer 8. In this manner, the waterproof sheet 2 is sequentially fixed at a plurality of locations. As the washer 8 for fixing the waterproof sheet 2, a washer with a seal is used in terms of waterproofness.

Next, the outer surface of the waterproof sheet 2 is covered with a reticulated body 4 in layers through a heat insulating material 3 having a desired thickness, and the tip end side of the screw portion 61 of the anchor bolt 6 is covered with the reticulated material 4 through the heat insulating material 3. Let it project outside. The nut 7 is screwed onto the tip end side of the screw portion 61 via the washer 8, and the heat insulating material 3 is inserted via the washer 8.
The mesh body 4 is pressed and fixed to the outer side of the waterproof sheet 2.

At this time, since the temperature in the tunnel varies depending on the cold region where construction is required, the thickness of the heat insulating material 3 should be adjusted to a desired thickness to exhibit its heat insulating property. Further, depending on the thickness of the heat insulating material 3 to be installed, the screwing position of the nut 7 screwed onto the tip side of the screw portion 61 of the anchor bolt 6 is adjusted, or the anchor bolt 6 having the screw portion 61 of a desired length in advance is installed. Is what you use.

Then, the outside of these is cemented with a cement composition 5
And the inner wall of the tunnel 1 is formed. The cement composition 5 may be any cement-containing material such as concrete, mortar, polymer concrete, and polymer mortar, and is preferably one having good water impermeability.

As the waterproof sheet 2, a waterproof sheet such as a synthetic resin sheet made of ethylene-vinyl acetate copolymer, polyethylene, polypropylene, polyvinyl chloride or the like or a synthetic rubber sheet is used. As the heat insulating material 3, a foamed synthetic resin such as foamed polyurethane or foamed polyethylene, or an inorganic foamed material is used. Generally, the heat insulating material 3 is formed in advance as a plate having a desired thickness, but may be foamed at a construction site to form a layer having a desired thickness.

As the mesh body 4, generally, a metal mesh such as expanded metal is preferably used, but a punching metal having a large number of holes in a metal plate or a mesh made of synthetic resin may be used. Good. Although the washer 8 is used to press and fix the waterproof sheet 2, the heat insulating material 3 and the mesh body 4 in the above-described embodiment, a pressing plate of an appropriate shape and size is used by being inserted into the anchor bolt 6 in place of the washer 8. May be done.

[0018]

As described above in detail, in the tunnel antifreezing method of the present invention, since the outside of the waterproof sheet covering the concrete inner wall surface of the tunnel is covered with the heat insulating material, the water leakage generated on the inner wall surface of the concrete does not freeze. , It is possible to prevent the formation of icicles and side ice that obstructs traffic in the tunnel and adversely affects auxiliary facilities in the tunnel.

Further, the tip end side of the screw portion of the anchor bolt having the waterproof sheet fixed to the inner wall surface of concrete is projected to the outside of the mesh body through the heat insulating material, and the heat insulating material and the mesh shape are meshed with the nut screwed to the tip side of the screw portion. Since the body is fixed to the outside of the waterproof sheet, it is possible to adjust the screwing position of the nut that is screwed to the tip side of the screw part of the anchor bolt with respect to the heat insulating material of various thicknesses, or the anchor that has a desired screw part length in advance. It can be easily handled by using bolts. Therefore, even if the temperature inside the tunnel varies depending on the cold region where construction is required, it is possible to easily cope with it by using a heat insulating material having a desired thickness according to the construction site.

Further, since the heat insulating material and the net-like body are fixed to the outer side of the waterproof sheet by using the anchor bolts fixing the waterproof sheet to the concrete inner wall surface as it is, the waterproof sheet and the heat insulating material and the net-like body can be attached. It can be installed by a common means through a common member and has good workability. or,
Since the outer surface of the heat insulating material is covered with the mesh body and fixed by the anchor bolts, the heat insulating material can be stably attached even if the thickness of the heat insulating material increases.

[Brief description of drawings]

FIG. 1 is an explanatory view of a tunnel to which a tunnel freeze prevention method of the present invention is applied.

FIG. 2 is an enlarged cross-sectional view of a portion A of FIG.

[Explanation of symbols]

 1 tunnel 11 concrete inner wall surface 2 waterproof sheet 3 heat insulating material 4 reticulated body 5 cement composition 6 anchor bolt 61 screw part 7 nut 8 washer

Claims (1)

[Claims] 1. A concrete inner wall surface of a tunnel is covered with a waterproof sheet, and an anchor bolt is driven from the outside of the waterproof sheet to project a screw portion having a predetermined length of the anchor bolt to the outside of the waterproof sheet. The waterproof sheet is fixed to the concrete inner wall surface with a nut screwed to the base end side of the section, and the outer side of the waterproof sheet is layered with a mesh body through a heat insulating material of a desired thickness, and the tip side of the screw section of the anchor bolt. Through the heat insulating material to the outside of the mesh body, the heat insulating material and the mesh body are fixed to the outside of the waterproof sheet by a nut screwed to the tip end side of the screw part, and the outside of the tunnel is frozen with a cement composition. Prevention method.