A railway tunnel drainage hole drainage blind pipe

Abstract

The utility model provides a kind of railway tunnel drain hole drainage's drain blind pipe, install in the tunnel primary support that is opened with drain hole, it include: drainage part, the drainage part is arranged in the drain hole;Limiting portion, the limiting portion is arranged on the tunnel primary support surface, and with the drainage part is resisted;The drainage part includes the drain blind pipe main body arranged in the drain hole, filter sleeve that is wrapped in the drain blind pipe main body outside, it is arranged in the drain hole inside, and the plug of filter sleeve and the drain blind pipe main body one end is sleeved;The drain blind pipe main body of this railway tunnel drain hole drainage is formed by drainage part, and it forms rough filter, fine filter, drainage integrated structure, to ensure drainage efficiency, and under the flexible fixing effect of annular steel plate and expansion bolt in limiting portion, both ensure the stable drain blind pipe main body and allow appropriate displacement, can adapt to tunnel primary support drainage, prevent lining deformation, long service life, maintenance is convenient.

Description

Technical Field

[0001] This utility model relates to the field of tunnel blind pipe technology, and more specifically, to a drainage blind pipe for drainage holes in railway tunnels. Background Technology

[0002] Tunnel drainage blind pipes are an important component of tunnel drainage systems and play a crucial role in tunnel drainage engineering. Specifically, fissure water in the tunnel rock mass seeps down through the geotextile behind the waterproofing slab and the gaps between the geotextile and the initial support face of the tunnel into the drainage blind pipes. The water is then promptly discharged into the tunnel drainage ditch through the blind pipes. Water within the initial support face of the tunnel also needs to be discharged through the installation of drainage blind pipes.

[0003] However, existing drainage hole technology has some defects or shortcomings:

[0004] Low drainage efficiency: Ordinary PVC drainage pipes rely solely on axial drainage, resulting in a small drainage space that is easily clogged by silt and sand. After long-term use, their drainage capacity decreases significantly.

[0005] Poor resistance to frost heave: Rigid pipes are prone to freezing and cracking in low-temperature environments, and tunnels in cold regions often fail.

[0006] Insufficient adaptability: Traditional structures cannot adapt to the deformation of the initial support of the tunnel (such as settlement and shrinkage), which can easily lead to pipe breakage or leakage at the joints. In addition, the filtration system is insufficient, requiring frequent dredging in environments with strong siltation. Utility Model Content

[0007] The purpose of this invention is to provide a blind drain pipe for drainage holes in railway tunnels, in order to solve the above-mentioned problems.

[0008] To achieve the above objectives, this utility model provides a blind drain pipe for drainage of drainage holes in railway tunnels, installed on the initial support of the tunnel where drainage holes are provided, comprising:

[0009] A drainage section is provided inside the drain hole;

[0010] A limiting part is provided on the initial support of the tunnel and abuts against the drainage part;

[0011] The drainage section includes a drainage blind pipe body disposed in the drainage hole, a filter sleeve wrapped around the outside of the drainage blind pipe body, a plug disposed inside the drainage hole and fitted onto the filter sleeve and one end of the drainage blind pipe body.

[0012] The limiting part includes an annular steel plate disposed on the surface of the tunnel's initial support and abutting against the other end of the main body of the drainage blind pipe.

[0013] Furthermore, the main body of the drainage blind pipe is a three-dimensional mesh-like interwoven structure formed by the fusion bonding of multiple layers of plastic polymer ribbons.

[0014] Furthermore, the plug is provided with several water-permeable holes, a filter pad is provided between the plug and the filter sleeve, and the plug and the filter sleeve are interference-fitted.

[0015] Furthermore, a number of expansion bolts are installed in a circular array on the annular steel plate, and the annular steel plate is fixed to the tunnel primary support by the number of expansion bolts. The thickness of the annular steel plate is not less than 2mm.

[0016] Furthermore, the inner diameter of the annular steel plate is larger than the inner diameter of the main body of the drainage blind pipe, but smaller than the diameter of the drain hole.

[0017] Furthermore, both the filter sleeve and the filter pad are made of non-woven fabric, and the filter sleeve has a thickness of 3mm.

[0018] Furthermore, an anchoring agent is filled between the main body of the drainage blind pipe and the drain hole, and the anchoring agent is located near the opening of the drain hole.

[0019] Compared with the prior art, the embodiments of this utility model have the following beneficial effects:

[0020] The drainage blind pipe used for the drainage hole of the railway tunnel adopts a three-dimensional mesh drainage structure, which can realize drainage in multiple directions such as axial and radial directions. The water flow has a large space, thus ensuring drainage efficiency and smooth drainage. Furthermore, the material and structure of the drainage blind pipe give it good tensile strength and deformation resistance. Therefore, even when the drainage hole undergoes certain settlement deformation, the drainage blind pipe can still maintain a certain drainage structure, avoiding the risk of breakage of rigid pipes, ensuring drainage effect, and having strong adaptability.

[0021] The drainage blind pipe used for drainage holes in this railway tunnel is wrapped with a filter sleeve and a plug, and a transition pad is added between the plug and the filter sleeve to form a gradient filtration system. This ensures filtration efficiency in heavily silted environments, extends the clogging cycle, and reduces maintenance frequency. During assembly, anchoring agent is locally filled at the drainage outlet. The limiting effect of the annular steel plate ensures that the drainage blind pipe body and the annular steel plate are connected by surface contact rather than rigidity. The anchoring agent contacts the filter sleeve but not directly contacts the drainage blind pipe body, allowing for a certain amount of radial displacement. The anchoring agent only locally anchors the drainage blind pipe, allowing some movement in the areas without anchoring agent, thus ensuring frost heave resistance, preventing frost damage, and effectively extending service life. Attached Figure Description

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0023] Figure 1 The front view of this utility model is shown;

[0024] Figure 2 A partial cross-sectional perspective view of this utility model is shown;

[0025] Figure 3 A partially disassembled perspective view of this utility model is shown;

[0026] Figure 4 A schematic diagram of the annular steel plate of this utility model is shown;

[0027] Figure 5 A schematic diagram of the plug of this utility model is shown.

[0028] In the picture

[0029] 1. Drainage hole; 2. Tunnel initial support; 3. Drainage section; 4. Limiting section; 5. Main body of drainage blind pipe; 6. Filter sleeve; 7. Plug; 8. Annular steel plate; 9. Water permeable hole; 10. Filter pad; 11. Expansion bolt; 12. Anchoring agent. Detailed Implementation

[0030] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.

[0031] like Figure 1-5 As shown, a blind drain pipe for draining water from a railway tunnel drainage hole is installed on the initial support 2 of the tunnel where a drainage hole 1 is provided, comprising:

[0032] Drainage section 3, wherein the drainage section 3 is disposed within the drain hole 1;

[0033] Limiting part 4 is disposed on the surface of the tunnel primary support 2 and abuts against the drainage part 3;

[0034] The drainage section 3 includes a drainage blind pipe body 5 disposed in the drainage hole 1, a filter sleeve 6 wrapped around the drainage blind pipe body 5, a plug 7 disposed inside the drainage hole 1 and fitted onto the filter sleeve 6 and one end of the drainage blind pipe body 5.

[0035] The limiting part 4 includes an annular steel plate 8 disposed on the surface of the tunnel primary support 2 and abutting against the other end of the drainage blind pipe body 5;

[0036] In the drainage section 3, the three-dimensional mesh structure of the drainage blind pipe body 5 forms a three-dimensional drainage channel. After the groundwater passes through the plug 7, it is then filtered by the filter sleeve 6 before entering the drainage blind pipe body 5, forming a gradient filtration to ensure sludge interception efficiency. This effectively improves the drainage effect in a strong siltation environment and extends the service life, eliminating the need for frequent maintenance. The water flow achieves multi-directional flow in the three-dimensional mesh structure, draining along the length of the pipe in the axial direction and diffusing laterally through the mesh pores in the radial direction, thereby ensuring drainage efficiency.

[0037] In the limiting part 4, the annular steel plate 8 provides radial constraint force through several expansion bolts 11 to restrict the movement of the drainage blind pipe body 5. At the opening of the drain hole 1, the local anchoring agent 12 fixes the pipe opening section of the drainage blind pipe body 5, leaving room for deformation. With the flexible structure of the drainage blind pipe body 5, it can adapt to a certain deformation of the tunnel initial support 2, ensuring the drainage effect of the tunnel initial support 2 in case of accidents, and avoiding the problem of frost heave damage.

[0038] Optionally, the main body 5 of the drainage blind pipe is a three-dimensional mesh-like interwoven structure formed by the fusion bonding of multiple layers of plastic polymer ribbons;

[0039] Multi-layered plastic polymer ribbons are bonded together through a hot-melt process to form a permeable porous network with excellent filtration properties. During use, water can flow into the drainage blind pipe body 5 in multiple directions, both horizontally and vertically, ensuring drainage speed, unlike traditional PVC pipes which only allow axial drainage. The plastic polymer is at least one of high-density polyethylene, polypropylene, or polyester, and combined with the overall mesh-like interwoven structure, it has good tensile strength and deformation resistance. Even when the drain hole 1 experiences some settlement deformation, the drainage blind pipe body 5 can still maintain a certain structure, avoiding the risk of breakage of rigid pipes and ensuring drainage effect. At the same time, this type of material has a certain degree of corrosion resistance, ensuring that it is not prone to structural failure due to corrosion during long-term use.

[0040] Optionally, the plug 7 is provided with a plurality of water-permeable holes 9, and a filter pad 10 is provided between the plug 7 and the filter sleeve 6, and the plug 7 and the filter sleeve 6 are interference fit.

[0041] The plug 7 has permeable holes 9, allowing water to flow through but restricting the entry of impurities. A filter pad 10 is added between the plug 7 and the filter sleeve 6 to form a double filtration barrier. In use, groundwater first passes through the permeable holes 9 of the plug 7, then through the filter pad 10 for primary filtration to intercept large particles, and finally through the filter cover for secondary filtration to capture fine particles before entering the main body of the drainage blind pipe 5, ensuring drainage effect in environments with strong siltation. The plug 7 and the filter sleeve 6 are tightly fitted with an interference fit to prevent water flow bypass and impurity leakage, and to ensure the stability of the plug 7 on the filter sleeve 6, avoiding loosening of components due to water pressure impact during drainage.

[0042] Optionally, a plurality of expansion bolts 11 are installed in a ring array on the annular steel plate 8, and the annular steel plate 8 is fixed to the tunnel primary support 2 by the plurality of expansion bolts 11, and the thickness of the annular steel plate 8 is not less than 2mm.

[0043] The annular steel plate 8 is fixed to the surface of the tunnel initial support 2 by an array of expansion bolts 11, forming a uniformly distributed anchoring force. When water pressure acts on the drainage blind pipe, the thrust is transmitted to the annular steel plate 8 through the end of the drainage blind pipe body 5, and then distributed by the annular steel plate 8 to multiple expansion bolts 11. Finally, the anchoring force of the expansion bolts 11 resists the thrust. The thicker steel plate can provide sufficient rigidity to prevent deformation from causing sealing failure, thereby ensuring the limiting effect of the drainage blind pipe body 5 in the drainage hole 1. After disassembling the annular steel plate 8, the condition of the drainage pipe can be directly observed without damaging the lining structure.

[0044] Optionally, the inner diameter of the annular steel plate 8 is larger than the inner diameter of the main body of the drainage blind pipe 5, but smaller than the diameter of the drain hole 1.

[0045] The inner diameter of the annular steel plate 8 is larger than the inner diameter of the drainage blind pipe, ensuring that the outlet of the drainage blind pipe body 5 is not blocked by the annular steel plate 8, and the water can be discharged without obstruction, avoiding water turbulence or local blockage caused by steel plate interference.

[0046] The inner diameter of the annular steel plate 8 is smaller than the diameter of the drainage hole 1, which provides operating space for the injection of the anchoring agent 12 and ensures that the annular steel plate 8 can completely cover the edge of the drainage hole 1 to prevent water seepage.

[0047] Optionally, both the filter sleeve 6 and the filter pad 10 are made of non-woven fabric, and the thickness of the filter sleeve 6 is not less than 3mm.

[0048] Non-woven fabrics have a certain degree of compression resistance and can maintain good porosity under certain pressure to ensure water permeability. Furthermore, non-woven fabrics are low-cost, can be quickly replaced on-site, and have low maintenance costs.

[0049] Optionally, an anchoring agent 12 is filled between the main body 5 of the drainage blind pipe and the drain hole 1, and the anchoring agent 12 is located near the opening of the drain hole 1;

[0050] By filling with anchoring agent 12, the gap between the main body 5 of the drainage blind pipe and the wall of the drainage hole 1 can be sealed, thereby preventing groundwater from leaking from the outside of the pipe wall and ensuring that all water flows through the filter sleeve 6 and the plug 7 into the main body 5 of the drainage blind pipe. Anchoring agent 12 is only filled in the opening section of the drainage hole 1, and drainage gaps are left inside to allow the main body 5 of the drainage blind pipe to move and deform moderately when the tunnel initial support 2 deforms, so as to avoid cracking caused by frost heave or structural deformation. Anchoring agent 12 can be modified epoxy resin to improve the compressive strength of the main body 5 of the drainage blind pipe.

[0051] Construction process of drainage hole 1

[0052] (1) Drain hole 1 is constructed using a pre-reserved method;

[0053] (2) After the drilling of drainage hole 1 is completed, a quality inspection shall be carried out. The inspection items include the drilling depth and the drilling diameter.

[0054] (3) After the drainage hole 1 passes the acceptance test, the hole should be flushed to remove rock powder and impurities until the return water is clean.

[0055] (4) The filter sleeve 6 should be wrapped with the main body 5 of the drainage blind pipe in the factory and manufactured in the factory to ensure quality. The length of the main body 5 of the drainage blind pipe should be customized according to the design length and should not be extended.

[0056] (5) After installation, fill the gap between the main body 5 of the drainage blind pipe and the opening of the drainage hole 1 with anchoring agent 12 within 20cm of the opening of the drainage hole 1, and then use 2mm thick annular steel plate 8 to drill holes and fix it to the surface of the tunnel primary support 2 with expansion bolts 11. Four expansion bolts 11 are installed in each drainage hole 1.

[0057] (6) After the drilling of the drainage hole 1 is completed, the main body 5 of the drainage blind pipe should be installed in time to prevent the drainage hole 1 from collapsing.

[0058] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A blind drain pipe for draining water from a drainage hole in a railway tunnel, installed on the initial support (2) of the tunnel where a drainage hole (1) is provided, characterized in that, include: Drainage section (3), wherein the drainage section (3) is disposed within the drain hole (1); The limiting part (4) is disposed on the tunnel primary support (2) and abuts against the drainage part (3); The drainage section (3) includes a drainage blind pipe body (5) disposed in the drain hole (1), a filter sleeve (6) wrapped around the outside of the drainage blind pipe body (5), and a plug (7) disposed inside the drain hole (1) and fitted on the filter sleeve (6) and one end of the drainage blind pipe body (5). The limiting part (4) includes an annular steel plate (8) disposed on the surface of the tunnel primary support (2) and abutting against the other end of the drainage blind pipe body (5).

2. A blind drain pipe for drainage of drainage holes in railway tunnels as described in claim 1, characterized in that, The main body of the drainage blind pipe (5) is a three-dimensional mesh-like interwoven structure formed by the fusion bonding of multiple layers of plastic polymer ribbons.

3. A blind drain pipe for drainage holes in railway tunnels as described in claim 2, characterized in that, The plug (7) has several water-permeable holes (9), and a filter pad (10) is provided between the plug (7) and the filter sleeve (6). The plug (7) and the filter sleeve (6) are interference-fitted.

4. A blind drain pipe for drainage holes in railway tunnels as described in claim 3, characterized in that, The annular steel plate (8) is equipped with a number of expansion bolts (11) arranged in a ring array. The annular steel plate (8) is fixed to the tunnel primary support (2) by the number of expansion bolts (11). The thickness of the annular steel plate (8) is not less than 2 mm.

5. A blind drain pipe for drainage of drainage holes in railway tunnels as described in claim 4, characterized in that, The inner diameter of the annular steel plate (8) is larger than the inner diameter of the main body of the drainage blind pipe (5) and smaller than the diameter of the drain hole (1).

6. A blind drain pipe for drainage of drainage holes in railway tunnels as described in claim 5, characterized in that, Both the filter sleeve (6) and the filter pad (10) are made of non-woven fabric, and the thickness of the filter sleeve (6) is not less than 3mm.

7. A blind drain pipe for drainage of drainage holes in railway tunnels as described in claim 6, characterized in that, An anchoring agent (12) is filled between the main body (5) of the drainage blind pipe and the drain hole (1), and the anchoring agent (12) is close to the opening of the drain hole (1).

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