Heat preservation device of tunnel circumferential blind pipe

Abstract

The utility model relates to the technical field of tunnel blind pipe heat preservation, in particular to a heat preservation device for a tunnel circumferential blind pipe. The device comprises an insulation board, the insulation board is provided with concave and convex interfaces which are matched with each other, and the edge of the insulation board is subjected to factory chamfering treatment to form a uniform section. By means of the concave-convex connector design, splicing gaps between the adjacent heat preservation plates can be eliminated, and it is guaranteed that the heat preservation effect at the joints is consistent with that of base metal; meanwhile, the heat preservation plate can be finely adjusted in an arc shape according to the tunnel section structure to be tightly attached to the tunnel face. In addition, due to the factorization customized clamping groove structure and the unified section design, the field installation difficulty and the labor cost are reduced, the technical problems that a traditional heat preservation plate with the fixed size is difficult to bend, and the heat preservation effect at the joint is poor are solved, and the anti-freezing heat preservation performance and the construction quality of the blind pipe are remarkably improved.

Description

Technical Field

[0001] This utility model relates to the field of tunnel blind pipe insulation technology, specifically a insulation device for a tunnel circumferential blind pipe. Background Technology

[0002] Currently, tunnel construction in China considers numerous factors such as construction cost, safety, and quality. Construction of tunnels in high-altitude, cold, and northern regions is particularly challenging, requiring high-quality secondary lining. Tunnel drainage is a critical aspect; inadequate drainage can lead to water leakage from the secondary lining, which can drip onto the overhead contact line and cause train stoppages. In northern regions, low temperatures and winter icing can create dangerous objects hanging above trains, exacerbating safety risks. Currently, in tunnels under construction, water leakage at the initial support face is primarily addressed through drainage diversion. Therefore, preventing tunnel drainage pipes from freezing and blocking drainage channels due to low temperatures is a key management focus to reduce safety accidents during later operation and eliminate potential hazards.

[0003] Traditional insulation boards have fixed dimensions and high rigidity, which is not conducive to curved bending during tunnel construction. Gaps exist between adjacent insulation boards, resulting in reduced insulation performance. Therefore, how to adjust the structure of existing insulation boards to avoid gaps between adjacent boards is a technical problem that needs to be solved. Utility Model Content

[0004] The problem to be solved is to provide a new type of insulation board structure that avoids gaps between adjacent insulation boards and ensures the insulation effect.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a heat preservation device for a tunnel circumferential blind pipe, wherein two opposite sides of the four sides of the heat preservation board body are provided with concave-convex interfaces, the concave-convex interfaces include protrusions and recesses, the shapes of the protrusions and recesses are matched to achieve seamless splicing of adjacent heat preservation boards; the other two opposite sides of the heat preservation board body are chamfered and provided with a slot structure.

[0006] Preferably, the contact surface between the protrusion and the recess of the concave-convex interface is a continuous arc-shaped surface, and its curvature is consistent with the preset arc shape of the tunnel circumferential blind pipe.

[0007] Preferably, the depth of the slot structure is 3-8mm and the width is 5-15mm.

[0008] Preferably, the main body of the insulation board is made of flexible composite insulation material, and the bending radius is adjustable within ±10% of the tunnel design arc.

[0009] Preferably, the surface of the convex and concave interface is covered with a waterproof sealing layer, which is made of rubber or silicone and has a thickness of 0.5-2mm.

[0010] Preferably, the thickness of the insulation board body is 20-50mm, and its surface is covered with a reflective heat insulation coating.

[0011] Preferably, the chamfered edge angle is 14°-45° and the horizontal width of the chamfer is 7-20cm.

[0012] Compared with the prior art, this utility model provides a heat preservation device for a tunnel circumferential blind pipe, which has the following beneficial effects:

[0013] 1. The modified insulation board is specially designed for use in tunnels, manufactured in the factory, and easy to install on site.

[0014] 2. The insulation board has a slot and is small in size, so no assistance is needed during installation, which reduces costs and saves labor.

[0015] 3. The specially designed concave-convex interface can improve the original splicing seam at the interface and make it smooth.

[0016] 4. The tongue and groove joint can improve the insulation effect of the insulation board, making the joint and the base material have the same insulation effect.

[0017] 5. Factory-made chamfering ensures uniform cross-sections, eliminating the need for on-site cutting, resulting in aesthetically pleasing installation and facilitating quality control.

[0018] 6. The concave-convex interface can be finely adjusted to fit the tunnel surface by adjusting the arc shape of the insulation board according to the tunnel cross-section structure. Attached Figure Description

[0019] Figure 1 A schematic diagram of the existing insulation board structure.

[0020] Figure 2 This is a structural diagram of an existing insulation board.

[0021] Figure 3 This is an isometric schematic diagram of the present invention;

[0022] Figure 4 This is an isometric view of the present invention from another angle;

[0023] Figure 5 These are the front view and top view of the main body of the insulation board of this utility model;

[0024] Figure 6 This is a schematic diagram of the connection of the main body of the insulation board of this utility model;

[0025] Explanation of reference numerals in the attached drawings: 100, initial support; 102, circumferential blind pipe; 103, geotextile nonwoven fabric; 104, waterproof membrane one; 105, insulation layer; 106, waterproof membrane two; 107, secondary lining; 1, main body of insulation board; 11, left side; 12, front side; 13, right side; 14, rear side; 2, concave-convex interface; 21, protrusion; 22, recess; 3, slot structure. Detailed Implementation

[0026] The technical solutions of the present utility model will now be described with reference to the accompanying drawings in the embodiments of the present utility model:

[0027] To address the problems mentioned in the background art, this utility model provides a heat preservation device for a tunnel circumferential blind pipe, such as... Figure 1 The diagram shows a scenario where the insulation board is used. A circumferential blind pipe 102 is installed within the initial support 100. Geotextile nonwoven fabric 103 and waterproofing board one 104 are laid on the outer surface of the initial support 100. Then, an insulation layer 105 is laid at the corresponding position of the circumferential blind pipe 102, and a second waterproofing board 106 is laid on top of the insulation layer 105. This is followed by the pouring of the secondary lining 107. The insulation layer 105 of the circumferential blind pipe 102 uses a 5cm thick insulation board, 1.5m wide, and is wrapped with a 2m wide waterproofing board two 106. The 2m wide waterproofing board two 106 is welded to the tunnel arch wall waterproofing board one 104 via double welds, making the 2m wide waterproofing board two 106 + insulation board + arch wall waterproofing board one 104 a single unit, laid behind the circumferential blind pipe 102. The geotextile nonwoven fabric 103 serves as a buffer layer, with a unit density of not less than 400g / m³. 2 Geotextile.

[0028] In this invention, the insulation layer 104 includes an insulation board body 1, which is made of flexible composite insulation material. Its bending radius is adjustable within ±10% of the tunnel's designed curvature. This adjustable radius allows the insulation board to adapt to minor deviations in the tunnel's cross-sectional curvature, ensuring a tight fit with the tunnel surface and preventing installation gaps due to curvature mismatch. The flexible composite insulation material includes a polyurethane foam layer and a glass fiber reinforcement layer. The polyurethane foam layer provides excellent thermal insulation performance, reducing heat transfer and preventing icing of blind pipes. The glass fiber reinforcement layer enhances the insulation board's mechanical strength and resistance to deformation, ensuring long-term stability in the complex tunnel environment. The insulation board body 1 has a thickness of 20-50mm and its surface is covered with a reflective thermal insulation coating. This coating reflects external heat radiation, reducing heat exchange and further improving insulation efficiency.

[0029] Several insulation board bodies 1 are spliced ​​and laid between two layers of waterproof board. Two opposite sides of the four sides of each insulation board body 1 have protruding and recessed interfaces 2, such as... Figure 2-4As shown, the left side 11 and right side 13 are provided with a convex-concave interface 2. The convex-concave interface 2 includes a protrusion 21 and a recess 22. The protrusion 21 is provided on the left side 11, and the recess 22 is provided on the right side 13. The shapes of the protrusion 21 and the recess 22 match each other to achieve seamless splicing of adjacent insulation boards. The contact surface of the protrusion 21 and the recess 22 of the convex-concave interface 2 is a continuous arc-shaped surface. Its curvature is consistent with the preset curvature of the tunnel circumferential blind pipe. The continuous arc-shaped surface design is consistent with the preset curvature of the tunnel circumferential blind pipe, ensuring seamless splicing of adjacent insulation boards and eliminating weak insulation areas caused by traditional splicing gaps. The surface of the convex-concave interface 2 is covered with a waterproof sealing layer. The waterproof sealing layer is made of rubber or silicone and has a thickness of 0.5-2mm. The waterproof sealing layer (rubber / silicone) covers the surface of the convex-concave interface to prevent water vapor from seeping into the joint and avoid damaging the insulation effect or blocking the blind pipe due to water seepage and freezing.

[0030] The insulation board body 1 has two opposite sides with chamfered edges and slot structures 3. The front side 12 and rear side 14 both have slot structures 3 at opposite positions. The slot structure 3 has a depth of 3-8mm and a width of 5-15mm, providing quick positioning and fixing functions, simplifying the on-site installation process and reducing manual adjustment time. The chamfered edge is an acute angle α, ranging from 14° to 45°, with a horizontal width L of 7-20cm. The chamfer eliminates edge burrs, preventing scratches on the waterproofing membrane or other components during installation, while also reducing gaps between the chamfer and the waterproofing membrane, improving installation efficiency. In tunnel construction, the chamfered section α of the insulation board body 1 is 14°, the horizontal width L is 20cm, and the vertical height is 5cm. Factory prefabrication ensures that each insulation board is the same size and shape, eliminating the need for on-site cutting, reducing construction errors, and improving the overall aesthetics and quality control of the installation.

[0031] In use, after the first layer of waterproof membrane is laid, the main body of the insulation board 1 is laid at the corresponding position of the circumferential blind pipe. Adjacent main bodies of the insulation board 1 are seamlessly spliced ​​by the concave-convex interface 2. Each main body of the insulation board 1 is fixed by the slot structure 3. The chamfered surface of the main body of the insulation board 1 faces the first layer of waterproof membrane and is attached to the first layer of waterproof membrane. The concave-convex interface 2 achieves seamless splicing and waterproof sealing between the main bodies of the insulation board 1. The slot structure 3 simplifies the installation process. The flexible material adapts to the curvature of the tunnel. Factory prefabrication ensures standardized production. Finally, a high-sealing, highly adaptable, and easy-to-construct insulation device is formed, which completely solves the problems of heat leakage at the joints of traditional insulation boards, complex installation, and easy freezing and blockage, and significantly improves the safety and durability of the tunnel drainage system.

[0032] This invention proposes a high-efficiency insulation device suitable for circumferential blind pipes in tunnels by optimizing the structural design of the insulation board. Its core lies in the use of prefabricated concave-convex interfaces and a uniform chamfered cross-section, solving the technical defects of traditional insulation boards, such as large gaps and cumbersome installation. The concave-convex interface design not only improves the sealing and insulation effect at the joints but also adapts to the fine-tuning requirements of the tunnel cross-section's curvature, ensuring a tight fit with the initial support surface. The introduction of a slot structure further simplifies the on-site installation process and reduces labor costs. Furthermore, the selection of flexible composite materials and the addition of a waterproof sealing layer significantly enhance the device's low-temperature resistance and long-term stability. This device can be widely used in high-altitude, cold-climate, and northern tunnel projects, effectively preventing icing and blockage of circumferential blind pipes, improving the safety and reliability of tunnel drainage systems, and possessing significant economic and social value.

[0033] The above embodiments are merely some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

Claims

1. A heat preservation device for a tunnel loop blind pipe, comprising a heat preservation plate body (1), characterized in that: Two opposite sides of the four sides of the insulation board body (1) are provided with concave-convex interfaces (2), the concave-convex interfaces (2) include convex parts (21) and concave parts (22), the shapes of the convex parts (21) and the concave parts (22) are matched with each other to realize seamless splicing of adjacent insulation boards; the other two opposite sides of the insulation board body (1) are chamfered and provided with clamping groove structures (3).

2. The tunnel ring blind pipe heat preservation device according to claim 1, characterized in that: The contact surfaces of the convex parts (21) and the concave parts (22) of the concave-convex interfaces (2) are continuous arc curved surfaces, the radii of the curved surfaces are consistent with the preset arc of the tunnel ring-shaped blind pipe.

3. The tunnel ring blind pipe heat preservation device according to claim 1, characterized in that: The depth of the clamping groove structure (3) is 3-8 mm, and the width is 5-15 mm.

4. The tunnel ring blind pipe heat preservation device according to claim 1, characterized in that: The material of the insulation board body (1) is a flexible composite thermal insulation material, and the adjustable range of the bending radius is ±10% of the design arc of the tunnel.

5. The tunnel ring blind pipe heat preservation device according to claim 1, characterized in that: The surface of the concave-convex interface (2) is covered with a waterproof sealing layer, the waterproof sealing layer is made of rubber or silicone, and the thickness is 0.5-2 mm.

6. The tunnel ring blind pipe heat preservation device according to any one of claims 1-5, characterized in that: The thickness of the insulation board body (1) is 20-50 mm, and the surface is covered with a reflective heat insulation coating.

7. The tunnel ring blind pipe heat preservation device according to claim 1, characterized in that: The angle of the chamfered cross-sectional edge is 14°-45°, and the chamfered horizontal width is 7-20 cm.

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