Laying and hanging structure of external thermal insulation layer of tunnel

Abstract

The utility model relates to a paving and hanging structure of an external thermal insulation layer of a tunnel, which comprises a primary support constructed after the tunnel is excavated, and geotechnical cloth is arranged on the inner surface of the primary support; a first waterproof plate is fixed on the inner surface of the geotechnical cloth; a waterproof connecting belt is arranged on the inner side of the first waterproof plate; an insulation board is arranged in the waterproof connecting band; a second waterproof plate is arranged on the other side, opposite to the first waterproof plate, of the waterproof connecting belt; a secondary lining is poured on the outer side of the second waterproof plate. A waterproof connecting belt is arranged between a first waterproof plate and a second waterproof plate, and a heat preservation plate is arranged in the waterproof connecting belt; the heat preservation layer is placed stably, the laying and hanging quality is improved, in the construction process, the heat preservation plate does not need to be installed in a bonding or frame prefabricating mode, the waterproof connecting belt is fixed in a welding mode, the heat preservation layer is placed in the waterproof connecting belt, the structure is stable, and operation is convenient.

Description

Technical Field

[0001] The utility model relates to a tunnel, in particular to the construction of an external thermal insulation layer of a tunnel in a severely cold area. Background Art

[0002] There are two main types of insulation materials in tunnels, depending on the method of laying: (1) “internal” insulation is placed on the surface of the secondary lining of the tunnel; (2) “external” insulation is placed between the primary support and the secondary lining of the tunnel.

[0003] At present, the external insulation layer mostly adopts the structure of "geotextile + waterproof board + insulation board + waterproof board". The double-layer waterproof board solution has extremely high requirements for the installation method of the insulation material, mainly manifested in: (1) The waterproof board close to the geotextile layer plays the first waterproofing role and cannot be damaged. It can only be installed by gluing or frame support; (2) The gluing installation method will make the weight of the insulation layer and the second lining side waterproof board rely on the welding point between the geotextile side waterproof board and the hot melt gasket, which is very easy to cause the welding point to fall off and the waterproof board to be damaged, further causing concrete voids; (3) The frame support installation method requires a customized frame, which is expensive, and the installation thickness is relatively thick, which is easy to eat up the concrete thickness. The second lining side waterproof board is not easy to lay and hang, and it is very easy to affect the civil construction period of the tunnel. Utility Model Content

[0004] The purpose of the utility model is to solve the above-mentioned shortcomings and provide a laying and hanging structure of an external insulation layer of a tunnel, which ensures the laying and hanging quality of the insulation layer, improves the laying and hanging reliability, is easy to operate, and does not affect the construction progress.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A laying and hanging structure for an external thermal insulation layer of a tunnel, comprising an initial support applied after tunnel excavation, wherein the inner surface of the initial support is provided with a geotextile; a first waterproof board is fixed to the inner surface of the geotextile; a waterproof connecting belt is provided on the inner side of the first waterproof board; an insulation board is provided in the waterproof connecting belt; a second waterproof board is provided on the other side of the waterproof belt opposite to the first waterproof board; a secondary lining is cast on the outer side of the second waterproof board.

[0007] Furthermore, the geotextile is fixed to the initial support by means of a hot-melt pad and nails; and the first waterproof plate is welded to the hot-melt pad.

[0008] Furthermore, a plurality of the waterproof connection belts are arranged along the tunnel line direction; the upper end of the waterproof connection belt is welded to the first waterproof board, and the lower end is welded to the second waterproof board.

[0009] Furthermore, the cross-section of the waterproof connecting strip is concave; the thermal insulation panels are arranged along the circumferential direction of the tunnel; and the longitudinal direction of each thermal insulation panel is connected by at least two waterproof connecting strips.

[0010] Furthermore, each of the waterproof connecting strips has two symmetrically arranged connecting strips; the lower end of each of the connecting strips is welded to the second waterproof board, and the upper end is welded to the first waterproof board after being tightened.

[0011] The utility model has the following beneficial effects: a waterproof connecting strip is arranged between the first waterproof board and the second waterproof board, and the thermal insulation board is built into the waterproof connecting strip; the thermal insulation layer is placed stably, and the laying quality is improved, and during the construction process, there is no need to install the thermal insulation board by bonding or prefabricated frames, but the waterproof connecting strip is fixed by welding, and the thermal insulation layer is placed in the waterproof connecting strip, the structure is stable, the operation is convenient, and it can be carried out simultaneously with the tunnel support construction without affecting the overall construction period. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the cross-section structure of the utility model.

[0013] Figure 2 This is the fixed drawing of the insulation board.

[0014] In the figure: 1 is the initial support, 2 is the geotextile, 3 is the first waterproof board, 4 is the waterproof connecting belt, 5 is the insulation board, 6 is the second waterproof board, and 7 is the secondary lining. DETAILED DESCRIPTION

[0015] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0016] The terms used herein, including technical and scientific terms, have the same meaning as those generally understood by those skilled in the art, unless the terms are defined differently. It should be understood that the terms defined in commonly used dictionaries have the same meaning as those in the prior art.

[0017] See also Figure 1-Figure 2

[0018] A laying and hanging structure of an external insulation layer of a tunnel comprises an initial support 1 applied after tunnel excavation, wherein a geotextile 2 is arranged on the inner surface of the initial support 1; a first waterproof board 3 is fixed to the inner surface of the geotextile 2; a waterproof connecting belt 4 is arranged on the inner side of the first waterproof board 3; an insulation board 5 is arranged inside the waterproof connecting belt 4; a second waterproof board 6 is arranged on the other side of the waterproof connecting belt 4 opposite to the first waterproof board 3; and a secondary lining 7 is cast on the outer side of the second waterproof board 6.

[0019] Furthermore, the geotextile 2 is fixed to the initial support 1 by means of a hot-melt pad and nails; and the first waterproofing board 3 is welded to the hot-melt pad.

[0020] Furthermore, a plurality of waterproof connection belts 4 are arranged along the tunnel line direction; the upper end of the waterproof connection belt 4 is welded to the first waterproof board 3 , and the lower end is welded to the second waterproof board 6 .

[0021] Furthermore, the cross section of the waterproof connection belt 4 is concave; the insulation boards 5 are arranged along the circumferential direction of the tunnel; and each insulation board is connected in the longitudinal direction by at least two waterproof connection belts 4 .

[0022] Furthermore, each waterproof connecting belt 4 has two symmetrically arranged connecting strips; the lower end of each connecting strip is welded to the second waterproof board, and the upper end is welded to the first waterproof board after being tightened.

[0023] The construction steps are: after the initial support 1 is completed, the geotextile 2 is immediately laid; after the geotextile 2 is completed, the first waterproof board 3 is immediately laid; after the first waterproof board 3 is completed, the waterproof board connecting belt 4 is welded and the insulation board 5 is fixed; after the insulation board 5 is completed, the second waterproof board 6 is welded and laid; after the second waterproof board 6 is completed, the secondary lining 7 is poured.

[0024] Specifically, after tunnel excavation, initial support 1 is applied, and geotextile 2 is fixed on the surface of initial support 1 with special hot-melt pads and nails. The first waterproof board 3 is welded to the special hot-melt pad for fixing geotextile 2 by heating with a manual electric heat welder. The waterproof connection belt 4 is made of the remaining scraps of the first waterproof board 3, with a width of not less than 10 cm and a length of not less than 100 cm. On the side walls of both sides of the tunnel, one end of the waterproof board connection belt 4 is welded to the first waterproof board 3 by a manual electric heat welder from bottom to top, with a welding length of about 15 cm, and the welding is firm to ensure that it can withstand the weight of the insulation board 5 and the second waterproof board 6 after hanging. Each insulation board 5 shall have no less than two waterproof board connection belts 4 in the longitudinal direction. After the insulation board 5 is in place, the two waterproof connection belts 4 are tightened, and the other ends of the waterproof connection belts 4 are also welded to the first waterproof board 3. The first waterproof board 6 is welded to the waterproof board connection belt 4 by heating with a manual electric heat welder. Finally, the secondary lining 7 is poured.

[0025] Finally, it should be noted that the above embodiments are only for illustrating the technical solution of the utility model rather than limiting it. Although the utility model is described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A laying and hanging structure of an external insulation layer of a tunnel, including an initial support applied after tunnel excavation, characterized in that: The inner surface of the initial support is provided with a geotextile; a first waterproof board is fixed to the inner surface of the geotextile; a waterproof connecting belt is provided on the inner side of the first waterproof board; an insulation board is provided in the waterproof connecting belt; a second waterproof board is provided on the other side of the waterproof connecting belt relative to the first waterproof board; a secondary lining is cast on the outer side of the second waterproof board.

2. The laying and hanging structure of the external insulation layer of a tunnel according to claim 1 is characterized by: The geotextile is fixed on the initial support through hot-melt pads and nails; the first waterproof plate is welded on the hot-melt pads.

3. The laying and hanging structure of the external insulation layer of a tunnel according to claim 2 is characterized by: A plurality of the waterproof connection belts are arranged along the tunnel line direction; the upper end of the waterproof connection belt is welded to the first waterproof board, and the lower end is welded to the second waterproof board.

4. The laying and hanging structure of the external insulation layer of a tunnel according to claim 3 is characterized by: The cross section of the waterproof connection belt is concave; the insulation boards are arranged along the circumferential direction of the tunnel; and the longitudinal direction of each insulation board is supported by at least two waterproof connection belts.

5. The laying and hanging structure of the external insulation layer of a tunnel according to claim 4 is characterized by: Each of the waterproof connecting strips has two symmetrically arranged connecting strips; the lower end of each of the connecting strips is welded to the second waterproof board, and the upper end is welded to the first waterproof board after being tightened.

Images