Thermal insulation layer structure between tunnel anti-freezing fortification primary support and secondary lining

Abstract

The utility model discloses a thermal insulation layer structure between a tunnel anti-freezing fortification primary support and a secondary lining, which comprises a surrounding rock, a primary support, a first layer of waterproof plate, a polyurethane thermal insulation plate, a second layer of waterproof plate and a secondary lining which are sequentially arranged from outside to inside, the first layer waterproof board, the polyurethane insulation board and the second layer waterproof board are connected through an I-shaped insulation board clamp, the insulation board clamp comprises two wing plates and a web plate, the two wing plates are connected with the first layer waterproof board and the second layer waterproof board respectively, and the web plate is connected with the first layer waterproof board and the second layer waterproof board. An insulation board inserting seam is formed between the web and the two wing plates and is used for mounting the polyurethane insulation board. The utility model has the advantages that the structure is simple, and the installation is convenient; and the construction efficiency is effectively improved while the heat preservation effect is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of tunnels, in particular to a thermal insulation layer structure between an initial support and a secondary lining of a tunnel antifreeze protection. Background Art

[0002] Tunnels in extremely cold regions usually need to be insulated during operation to prevent low temperatures from causing damage to the tunnel structure. Tunnel insulation structures in the prior art usually use ordinary insulation boards. However, such ordinary insulation boards are heavy and require high construction requirements for laying, which makes their construction difficult and inefficient. The existing ordinary insulation boards have a large thermal conductivity coefficient and poor thermal insulation performance, which cannot meet the insulation requirements of tunnels in extremely cold regions, and their waterproof and drainage performance is poor. Therefore, traditional insulation boards have poor insulation performance in extremely cold regions and cannot meet the insulation requirements during the actual operation of tunnels. Tunnel structures will be damaged, which will seriously affect the operation of the tunnel.

[0003] Therefore, there is a need for an insulation layer structure between the initial support and the secondary lining of the tunnel antifreeze protection that can solve the above-mentioned problems. Summary of the invention

[0004] The purpose of the utility model is to provide an insulation layer structure between the initial support of the tunnel antifreeze protection and the secondary lining based on the above-mentioned deficiencies of the prior art. The first layer of waterproof board, the polyurethane insulation board and the second layer of waterproof board are connected by an I-shaped insulation board clamp, which effectively improves the construction efficiency while ensuring the insulation effect.

[0005] The purpose of this utility model is achieved by the following technical solutions:

[0006] A thermal insulation layer structure between the initial support and the secondary lining of a tunnel antifreeze defense, characterized in that it includes surrounding rock, initial support, a first layer of waterproof board, a polyurethane thermal insulation board, a second layer of waterproof board and a secondary lining arranged in sequence from the outside to the inside, the first layer of waterproof board, the polyurethane thermal insulation board and the second layer of waterproof board are connected by an I-shaped thermal insulation board clamp, the thermal insulation board clamp includes two wing plates and a web plate, the two wing plates are respectively connected to the first layer of waterproof board and the second layer of waterproof board, and a thermal insulation board plug-in seam is formed between the web plate and the two wing plates for installing the polyurethane thermal insulation board.

[0007] The wing plates are provided with hot-melt gaskets, and the two wing plates are electromagnetically welded to the first waterproof plate and the second waterproof plate respectively.

[0008] The gap between the insulation board insertion seam and the polyurethane insulation board is filled with polysulfide sealant.

[0009] The included angle between the wing plate and the web plate is 70° to 85°.

[0010] The thermal insulation board fixtures are arranged at intervals in both the circumferential direction and the line direction of the tunnel.

[0011] The utility model has the advantages of simple structure and convenient installation; the first layer of waterproof board, the polyurethane insulation board and the second layer of waterproof board are connected by an I-shaped insulation board clamp, which effectively improves the construction efficiency while ensuring the insulation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the arrangement of the insulation board fixture of the utility model along the tunnel line direction;

[0013] Figure 2 It is a schematic diagram of the arrangement of the insulation board fixture of the utility model along the circumferential direction of the tunnel;

[0014] Figure 3 It is a partial schematic diagram of the insulation layer structure of the utility model;

[0015] Figure 4 This is a schematic diagram of the structure of the thermal insulation board fixture of the utility model;

[0016] Figure 5 The utility model is a laying flow chart of the thermal insulation layer structure. DETAILED DESCRIPTION

[0017] The following is a further detailed description of the features of the present invention and other related features through embodiments in conjunction with the accompanying drawings to facilitate understanding by technicians in the same industry:

[0018] like Figures 1 to 5 As shown, the marks in the figure represent respectively:

[0019] Surrounding rock 1, initial support 2, first layer of waterproof board 3, polyurethane insulation board 4, second layer of waterproof board 5, secondary lining 6, insulation board clamps 7, wing plates 8, web plates 9, insulation board plug-in joints 10.

[0020] Example: Figures 1 to 4As shown, this embodiment relates to an insulation layer structure between the initial support and the secondary lining of a tunnel antifreeze defense, which mainly includes surrounding rock 1, initial support 2, first layer waterproof board 3, polyurethane insulation board 4, second layer waterproof board 5 and secondary lining 6 arranged in sequence from outside to inside, and the first layer waterproof board 3, polyurethane insulation board 4 and second layer waterproof board 5 are connected by an I-shaped insulation board fixture 7. The setting of the insulation board fixture 7 not only facilitates the installation of the polyurethane insulation board 4, but also can connect the first layer waterproof board 3, polyurethane insulation board 4 and second layer waterproof board 5 together. In this embodiment, the insulation board fixture 7 is arranged at intervals in the circumferential direction and line direction of the tunnel, which is convenient for the arrangement of the polyurethane insulation board 4; the polyurethane insulation board 4 uses a 5cm thick hard polyurethane foam plastic board.

[0021] like Figures 1 to 4 As shown, the insulation board fixture 7 includes two wing plates 8 and a web plate 9. The two wing plates 8 are electromagnetically welded to the first waterproof board 3 and the second waterproof board 5, respectively. In this embodiment, a hot-melt gasket is provided on the wing plate 8, which is conducive to electromagnetic welding to protect the first waterproof board 3 and the second waterproof board 5. An insulation board plug-in seam 10 is formed between the web plate 9 and the two wing plates 8 for installing the polyurethane insulation board 4. In this embodiment, the angle α between the wing plate 8 and the web plate 9 is 70° to 80°, ensuring that the polyurethane insulation board 4 is inserted into the insulation board plug-in seam 10, mutually stressed and not easy to loosen, and the gap between the insulation board plug-in seam 10 and the polyurethane insulation board 4 is filled with polysulfide sealant to strengthen the connection between the insulation board fixture 7 and the polyurethane insulation board 4. In addition, the gap between adjacent polyurethane insulation boards 4 is also filled with polysulfide sealant to ensure the connection between the polyurethane insulation boards 4.

[0022] like Figures 1 to 5 As shown, this embodiment also has the following construction method:

[0023] Step 1: Close the initial support and level it, lay the geotextile, arrange the hot-melt gaskets on the side walls and the vault in a "plum blossom" or "well" shape, and connect the first layer of waterproof board to the hot-melt gaskets by electromagnetic welding.

[0024] Step 2: After the first layer of waterproof board is fixed, fix the outer side of the upper gasket of the insulation board fixture to the laid first layer of waterproof board by electromagnetic welding.

[0025] Step 3: After the insulation board fixtures are fixed, insert the insulation board into the insulation board joints and apply it continuously. Fill the joints between the insulation boards with polysulfide sealant to increase the firmness and integrity of the insulation boards. Complete the laying and fixing of one environmental insulation board, check the closeness of the polyurethane insulation board, and add insulation board fixtures if necessary.

[0026] Step 4: Finally, connect the second layer of waterproof board to the outer side of the lower wing plate of the insulation board fixture through electromagnetic welding to complete the sealing of the insulation layer.

[0027] The beneficial technical effects of this embodiment are: simple structure and easy installation; the first layer of waterproof board, the polyurethane insulation board and the second layer of waterproof board are connected by an I-shaped insulation board clamp, which effectively improves the construction efficiency while ensuring the insulation effect.

[0028] Although the above embodiments have described the concepts and embodiments of the purpose of the utility model in detail with reference to the accompanying drawings, ordinary technicians in this field can recognize that various improvements and modifications can still be made to the utility model without departing from the scope of the claims, so they are not described one by one here.

Claims

1. A thermal insulation layer structure between the initial support and the secondary lining of a tunnel antifreeze protection, characterized in that: It includes surrounding rock, initial support, a first layer of waterproof board, a polyurethane insulation board, a second layer of waterproof board and secondary lining which are arranged in sequence from the outside to the inside. The first layer of waterproof board, the polyurethane insulation board and the second layer of waterproof board are connected by an I-shaped insulation board clamp. The insulation board clamp includes two wing plates and a web plate. The two wing plates are respectively connected to the first layer of waterproof board and the second layer of waterproof board. An insulation board plug-in seam is formed between the web plate and the two wing plates for installing the polyurethane insulation board.

2. The insulation layer structure between the initial support and the secondary lining of a tunnel antifreeze protection as claimed in claim 1, characterized in that: The wing plates are provided with hot-melt gaskets, and the two wing plates are electromagnetically welded to the first waterproof plate and the second waterproof plate respectively.

3. The insulation layer structure between the initial support and the secondary lining of a tunnel antifreeze protection as claimed in claim 1, characterized in that: The gap between the insulation board insertion seam and the polyurethane insulation board is filled with polysulfide sealant.

4. The insulation layer structure between the initial support and the secondary lining of a tunnel antifreeze protection as claimed in claim 1, characterized in that: The included angle between the wing plate and the web plate is 70° to 85°.

5. The insulation layer structure between the initial support and the secondary lining of a tunnel antifreeze protection as claimed in claim 1, characterized in that: The thermal insulation board fixtures are arranged at intervals in both the circumferential direction and the line direction of the tunnel.

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