Water treatment device outside non-pressure diversion tunnel in karst area

Abstract

The utility model relates to a karst area non-pressure diversion tunnel external water treatment device which comprises a diversion steel pipe, a flap valve and a filter screen, one end of the diversion steel pipe is provided with the flap valve, and the other end of the diversion steel pipe is provided with the filter screen. Compared with other treatment modes in the prior art, the external water treatment device for the non-pressure diversion tunnel in the karst area is simple in structure, good in integrality when being combined with a concrete lining, convenient to construct, low in manufacturing cost, easy to maintain and treat, capable of intercepting most of objects carried by underground water through the filter screen and not prone to clogging, and high in practicability. And meanwhile, good structural strength and stability are achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of tunnel drainage, and particularly relates to an external water treatment device for a non-pressure water diversion tunnel in a karst area. Background Art

[0002] my country is the country with the most extensive development of karst landforms, especially in the southwest region. When constructing a water diversion tunnel in a karst area, karst geology is usually encountered along the way, which is mainly manifested in the development of karst channels, complex geological conditions, complex distribution of underground karst water, and dynamic changes in flow with atmospheric precipitation. Tunnel construction or operation period are facing uncertain external water pressure. If the groundwater is not handled properly, a series of engineering problems will arise in the later operation process. Especially for non-pressure water diversion tunnels, there is insufficient understanding of the fissure water pressure during the early design, and the bottom plate and side walls may crack and arch under the action of external water pressure during the later operation.

[0003] According to traditional design ideas, when hydraulic tunnels pass through karst development areas, groundwater is usually treated by setting drainage holes, burying pipes in the tunnel, or setting one-way drainage valves to divert water from outside to inside, consolidation grouting and plugging, etc., to reduce the external water pressure of the tunnel lining and ensure the structural safety of the water diversion system. In view of the uncertainty of groundwater flow channels in karst areas, when problems affecting the safety of tunnel structures are found during operation, it is usually difficult to solve them by grouting. Burying pipes or setting one-way drainage valves are difficult to adapt to the large amount of water inflow and high sediment content in karst areas due to their small orifices. The one-way drainage valve has a small diameter and is made of plastic. It has poor bonding with concrete. When the external water pressure is high, the drainage valve is easily damaged and fails, causing internal water to seep out; when the karst groundwater carries more debris or sediment, the one-way drainage valve is also prone to clogging or poor operation. Utility Model Content

[0004] In view of this, the purpose of the utility model is to provide a non-pressure water diversion tunnel external water treatment device in karst areas to address the deficiencies of the prior art, so as to divert external water inward and effectively solve the problem of internal water seepage.

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

[0006] The invention discloses an external water treatment device for a non-pressure water diversion tunnel in a karst area, comprising a water diversion steel pipe, a flap gate and a filter screen. The flap gate is arranged at one end of the water diversion steel pipe, and the filter screen is arranged at the other end.

[0007] In order to better realize the utility model, further optimization is made in the above structure, and a limiting mechanism is arranged on the outside of the water diversion steel pipe.

[0008] In order to better realize the utility model, further optimization is made in the above structure, and the limiting mechanism is a stiffening ring.

[0009] In order to better realize the utility model, further optimization is made in the above structure, and multiple stiffening rings are provided.

[0010] In order to better realize the utility model, further optimization is made in the above structure, and the stiffening ring is welded on the outside of the water diversion steel pipe.

[0011] In order to better realize the utility model, further optimization is made in the above structure, and the filter screen is a steel wire screen.

[0012] In order to better realize the utility model, further optimization is made in the above structure, and the diameter of the steel wire of the wire mesh is 25 mm.

[0013] In order to better realize the utility model, further optimization is made in the above structure, and the flap door and the water diversion steel pipe are connected by welding or flange.

[0014] Compared with the prior art, the utility model has the following beneficial effects:

[0015] Compared with other previous treatment methods, the external water treatment device for the pressure-free water diversion tunnel in karst areas provided by the utility model has a simple structure, good integrity combined with the concrete lining, convenient construction, low cost, easy maintenance and treatment, can intercept most of the groundwater carryover through the filter screen and is not easy to be blocked, and has good structural strength and stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 It is a side sectional view of the utility model;

[0018] Figure 2 It is a structural schematic diagram of the filter screen in the utility model.

[0019] In the figure:

[0020] 1-water diversion steel pipe, 2-flap gate, 3-filter screen, 4-stiffening ring, 5-tunnel side wall, 6-tunnel bottom plate, 7-concrete anti-impact pier. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be described in detail below. 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 implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the utility model.

[0022] In the description of the present utility model, it should be noted that, unless otherwise specified, "multiple" means two or more; the orientations or positional relationships indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present utility model. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0023] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0024] Reference Figure 1 and Figure 2 The utility model provides a non-pressure water diversion tunnel external water treatment device in karst areas, comprising a water diversion steel pipe 1, a flap gate 2 and a filter 3. The flap gate 2 is arranged at one end of the water diversion steel pipe 1, and the filter 3 is arranged at the other end. When the external water pressure is greater than the designed internal water pressure, the flap gate 2 is opened, and the external water is diverted inwardly, thereby reducing the external water pressure on the tunnel lining; when the internal water pressure is greater than the external water pressure, the flap gate 2 is closed, which can effectively solve the problem of internal water seepage.

[0025] A limiting mechanism is provided on the outside of the water diversion steel pipe 1 to prevent it from being pulled out due to excessive external water pressure. In this embodiment, the limiting mechanism is a plurality of stiffening rings 4, which not only play a limiting role, but also enhance the structural strength and stability of the water diversion steel pipe 1. The stiffening ring 4 is welded to the outside of the water diversion steel pipe 1, and the connection is firm to prevent loosening.

[0026] like Figure 2 As shown, the filter screen 3 is a steel wire mesh, the steel wire diameter of the steel wire mesh is 25 mm, the strength is high, and it can effectively resist the extrusion of stones in the tunnel side wall 5.

[0027] The flap door 2 is connected to the water diversion steel pipe 1 by welding or flange connection, and the connection is firm to prevent the flap door 2 and the water diversion steel pipe 1 from being impacted and separated when the external water pressure of the flap door 2 is too large.

[0028] During installation, if Figure 1 As shown, the tunnel is formed by pouring concrete of the tunnel side wall 5 and the tunnel bottom plate 6. Before the water diversion steel pipe 1 is installed, stones are first filled into the cave. The thickness of the stone filling is not less than 1m. The stones are used to filter out large pieces of garbage carried by the groundwater to ensure the smooth operation of the flap gate 2. Then the water diversion steel pipe 1 is inserted into the corner of the tunnel side wall 5. The filter net 3 at the bottom of the water diversion steel pipe 1 reaches the stone layer filled in advance. The external water needs to be filtered through the stone layer and the filter net 3 before entering the water diversion steel pipe 1. Then the water diversion steel pipe 1 is poured together with the concrete. The stiffening ring 4 on the outside of the water diversion steel pipe 1 plays a reinforcing role and is more firmly combined with the concrete layer. Finally, a concrete anti-impact pier 7 is set on the outside of the flap gate 2 to complete the construction.

[0029] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the utility model, which should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A water treatment device outside a non-pressure water diversion tunnel in a karst area, characterized by: It comprises a water diversion steel pipe (1), a flap door (2) and a filter net (3); the flap door (2) is arranged at one end of the water diversion steel pipe (1), and the filter net (3) is arranged at the other end.

2. The device for treating water outside a non-pressure diversion tunnel in a karst area according to claim 1 is characterized by: A limiting mechanism is arranged on the outer side of the water diversion steel pipe (1).

3. The device for treating water outside a non-pressure diversion tunnel in a karst area according to claim 2 is characterized by: The limiting mechanism is a stiffening ring (4).

4. The device for treating water outside a non-pressure water diversion tunnel in a karst area according to claim 3 is characterized by: A plurality of stiffening rings (4) are provided.

5. The device for treating water outside a non-pressure water diversion tunnel in a karst area according to claim 4 is characterized by: The stiffening ring (4) is welded to the outside of the water diversion steel pipe (1).

6. The device for treating water outside a non-pressure water diversion tunnel in a karst area according to claim 1 is characterized by: The filter screen (3) is a steel wire screen.

7. The device for treating water outside a non-pressure water diversion tunnel in a karst area according to claim 6 is characterized by: The steel wire diameter of the steel wire mesh is 25 mm.

8. The device for treating water outside a non-pressure diversion tunnel in a karst area according to any one of claims 1 to 7, characterized in that: The flap door (2) is connected to the water diversion steel pipe (1) by welding or flange connection.

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