A circumferential surrounding rock fitting type anti-crystallization drainage blind pipe for tunnels

Abstract

The present invention discloses a tunnel circumferential surrounding rock-fitting anti-crystallization drainage blind pipe. At present, the tunnel drainage blind pipes on railways are all corrugated circular blind pipes, which have a small contact surface with the surrounding rock and waterproof board and are difficult to bend, resulting in poor fitting of the waterproof board and the surrounding rock where the drainage blind pipe is set. The blind pipe body of the present invention includes two flat sections and two arc-shaped fitting sections, the two flat sections are parallel, and the two arc-shaped fitting sections are respectively arranged between the two flat sections; the blind pipe body adopts three-sided openings, and the flat section close to the water flow surface is not provided with seepage holes. A filter layer is provided on the outside of the blind pipe, and the filter layer is woven with high-strength polyester yarn and long-fiber non-woven fabric. The blind pipe of the present invention is flat as a whole, which better fits the surrounding rock and waterproof board, increases the contact area with the surrounding rock and waterproof board, and minimizes the gap between the drainage blind pipe and the surrounding rock and waterproof board as much as possible, thereby reducing the voids after pouring concrete and ensuring that the secondary lining thickness meets the requirements.

Description

Technical Field

[0001] The present invention belongs to the technical field of water supply and drainage facilities, and in particular relates to a tunnel annular surrounding rock-fitted anti-crystallization drainage blind pipe. Background Art

[0002] Currently, the tunnel annular drainage blind pipes used in railways are all corrugated circular blind pipes made of PE material. After the circular blind pipes are fixed to the primary support surface, the contact area between the circular blind pipes and the surrounding rock and waterproof board is small when the tunnel waterproof board is laid. In addition, the circular blind pipes have large annular stiffness, and the waterproof board is difficult to bend due to its material and thickness requirements. As a result, the waterproof board and the surrounding rock are poorly fitted where the drainage blind pipes are installed, and a large wedge-shaped space is formed on both sides of the drainage blind pipes. When the tunnel secondary lining concrete is poured, this space is not easily filled with concrete, usually resulting in voids, affecting the thickness of the concrete in this area and causing the secondary lining thickness to fail to meet the requirements. Summary of the Invention

[0003] In order to make up for the shortcomings of the existing technology, the present invention provides a tunnel circumferential surrounding rock-fitting anti-crystallization drainage blind pipe, which increases the contact area with the surrounding rock and waterproof board, reduces the gap between the drainage blind pipe and the surrounding rock and waterproof board, and ensures that the secondary lining thickness meets the construction requirements.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is:

[0005] A tunnel circumferential surrounding rock-fitting anti-crystallization drainage blind pipe, characterized by comprising a blind pipe body, wherein the blind pipe body comprises two flat sections and two arc-shaped fitting sections;

[0006] The two flat sections are parallel to each other, and the two arc-shaped fitting sections are respectively arranged between the two flat sections;

[0007] The blind pipe body is opened on three sides, with water seepage holes set on a flat section and two arc-shaped fitting sections, and no water seepage holes set on the flat section close to the water flow surface;

[0008] A filter layer is provided on the outside of the blind pipe.

[0009] Furthermore, the arc-shaped openings of the two arc-shaped fitting sections are arranged opposite to each other.

[0010] Furthermore, the arc-shaped fitting section is in the shape of an arc.

[0011] Furthermore, the seepage holes are in the shape of long strips, the direction of the seepage holes on the arc-shaped fitting section is consistent with the curvature direction of the arc-shaped fitting section, and the direction of the seepage holes on the flat section is consistent with the width direction of the flat section.

[0012] Furthermore, the filter layer is woven from high-strength polyester yarn and long-fiber non-woven fabric.

[0013] Furthermore, the main molding material of the blind tube body is HDPE material.

[0014] Beneficial effects of the present invention:

[0015] 1) The blind tube body of the present invention is mainly formed of high-density polyethylene, which can make the blind tube body have good heat resistance and cold resistance, and has high rigidity and toughness. The overall double-wall structure can improve the overall compressive strength of the blind tube body;

[0016] 2) The blind pipe of the present invention is flat as a whole. Compared with the existing circular drainage blind pipe, it fits better with the surrounding rock and waterproof board, increases the contact area with the surrounding rock and waterproof board, and minimizes the gap between the drainage blind pipe and the surrounding rock and waterproof board. In turn, it can reduce the voids after pouring concrete, so that the secondary lining thickness meets the requirements.

[0017] 3) The filter layer woven from high-strength polyester yarn and long-fiber non-woven fabric is wrapped around the outside of the blind pipe body. It has a certain thermal insulation effect and good permeability, which well meets the water temperature environment in the tunnel and facilitates the infiltration of water from the tunnel surrounding rock. It also makes the filter layer more durable and prevents the filter layer from rotting and clogging the seepage holes.

[0018] 4) Compared to the concave and convex inner walls of traditional corrugated circular blind pipes, the inner wall of the blind pipe body of the present invention is smooth, which is more conducive to water flow and is less likely to cause crystallization due to water stains. At the same time, the blind pipe body adopts a process of opening holes on three sides and no holes on the water flow side, which also reduces the possibility of water stagnation in the pores during the dry season. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 Schematic diagram of the connection relationship between the blind tube body and the filter layer of the present invention;

[0021] In the figure, 1-blind pipe body, 11-flat section, 12-arc-shaped fitting section, 13-seepage hole, 2-inside of blind pipe, 3-outside of blind pipe, 4-filter layer. DETAILED DESCRIPTION

[0022] The present invention will be described in detail below with reference to specific embodiments.

[0023] like Figure 1 、 Figure 2As shown, the entire drainage blind pipe is flat and includes a blind pipe body 1. The blind pipe body 1 is made of high-density polyethylene (HDPE) and supplemented with an alkali-resistant antioxidant. The two are mixed by stirring and then injected into a screw extruder for hot extrusion molding. The high-density polyethylene (HDPE) material can make the blind pipe body have good heat resistance and cold resistance, as well as high rigidity and toughness. The main purpose of adding the alkali-resistant antioxidant is that the natural water environment in my country is mostly alkaline, so the addition of the alkali-resistant antioxidant can effectively inhibit the calcification of the blind pipe body 1 itself and the adsorption of alkaline substances on the surface.

[0024] The blind tube body 1 includes two flat sections 11 and two arc-shaped fitting sections 12. The two flat sections 11 are parallel to each other, and the two arc-shaped fitting sections 12 are respectively arranged between the two flat sections 11. The arc-shaped openings of the two arc-shaped fitting sections 12 are arranged opposite each other, and the ends of the two arc-shaped fitting sections 12 on the same side are connected by only one flat section 11. The flat sections 11 are rectangular, and the arc-shaped fitting section 12 is arc-shaped. Compared with the concave and convex inner walls of traditional corrugated circular blind tubes, the smooth inner wall 2 of the blind tube is more conducive to water flow, making it less likely for water stains to settle in the blind tube body and cause crystallization.

[0025] A filter layer 4 is provided on the outer side 3 of the blind pipe to block most of the sediment in the seepage water, thereby reducing the possibility of sediment blocking the seepage holes. The filter layer 4 is woven from high-strength polyester yarn and long-fiber non-woven fabric, which makes the filter layer durable and reduces the possibility of clogging the seepage holes on the blind pipe body due to filter layer decay. At the same time, the high-strength polyester yarn and long-fiber non-woven fabric have a certain thermal insulation effect and good permeability, which well meets the water temperature environment in the tunnel and facilitates the infiltration of tunnel surrounding rock water.

[0026] The present invention adopts three-sided openings, and seepage holes 13 are provided on a flat section 11 and two arc-shaped fitting sections 12. The flat section without seepage holes is located on the water flow surface; the process of not opening holes on the water flow surface avoids the accumulation of water in the pores during the dry season; the opening direction of the seepage holes located on the arc-shaped fitting section is consistent with the curvature direction of the arc-shaped fitting section, and the opening direction of the seepage holes located on the flat section is consistent with the width direction of the flat section; the seepage holes 13 are long strips.

[0027] When the blind pipe body 1 is laid in the tunnel, the arc-shaped fitting section 12 is the side that directly fits with the surrounding rock and the waterproof board. Compared with the existing circular drainage blind pipe, the arc-shaped fitting section 12 has a larger contact area with the surrounding rock and the waterproof board, and the fit is higher, thereby minimizing the gap between the drainage blind pipe and the surrounding rock and the waterproof board as much as possible, thereby reducing the voids after pouring concrete; at the same time, the drainage blind pipe with the same drainage area has a smaller side bending radius than the circular blind pipe in the related art. Therefore, the drainage blind pipe in the present application has greater compressive strength than the existing circular blind pipe, avoiding damage and deformation of the drainage blind pipe itself due to external forces during the construction of the tunnel secondary lining, and the reduced height can improve the bending ability of the drainage blind pipe, which is more conducive to on-site circumferential bending arrangement operations.

[0028] In the description of the present invention, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they may refer to fixed or detachable connections, or integration; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention in specific contexts.

[0029] The content of the present invention is not limited to the embodiments listed. Any equivalent transformation of the technical solution of the present invention made by ordinary technicians in this field after reading the description of the present invention is covered by the claims of the present invention.

Claims

1. A tunnel circumferential surrounding rock-fitting anti-crystallization drainage blind pipe, characterized by: It comprises a blind tube body (1), wherein the blind tube body (1) comprises two flat sections (11) and two arc-shaped fitting sections (12); The two flat sections (11) are parallel to each other, and the two arc-shaped fitting sections (12) are respectively arranged between the two flat sections (11); The blind tube body (1) is provided with holes on three sides, a flat section (11) and two arc-shaped fitting sections (12) are provided with water seepage holes (13), and the flat section (11) close to the water flow surface is not provided with water seepage holes (13); A filter layer (4) is provided on the outer side (3) of the blind tube; The seepage holes (13) are long strips, and the direction in which the seepage holes (13) located on the arc-shaped fitting section (12) are opened is consistent with the arc direction of the arc-shaped fitting section (12), and the direction in which the seepage holes (13) located on the flat section (11) are opened is consistent with the width direction of the flat section (11).

2. The tunnel circumferential surrounding rock-fitting anti-crystallization drainage blind pipe according to claim 1, characterized in that: The arc-shaped openings of the two arc-shaped fitting sections (12) are arranged opposite to each other.

3. The tunnel circumferential surrounding rock-fitting anti-crystallization drainage blind pipe according to claim 2, characterized in that: The arc-shaped fitting section (12) is in the shape of an arc.

4. The tunnel circumferential surrounding rock-fitting anti-crystallization drainage blind pipe according to claim 3 is characterized by: The filter layer (4) is woven from high-strength polyester yarn and long-fiber non-woven fabric.

5. The tunnel circumferential surrounding rock-fitting anti-crystallization drainage blind pipe according to claim 4 is characterized by: The main molding material of the blind tube body (1) is HDPE material.

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