Drainage and pressure reduction structure of flood discharge tunnel transversely penetrating through water-rich karst channel

Abstract

The utility model provides a flood discharge tunnel drainage and pressure reduction structure traversing a water-rich karst channel, which comprises a flood discharge tunnel traversing the water-rich karst channel, a plurality of drainage and pressure reduction holes are formed in a bottom plate lining of the flood discharge tunnel at intervals along the width direction of the bottom plate lining, the drainage and pressure reduction holes are communicated with the water-rich karst channel, and the drainage and pressure reduction holes are communicated with the water-rich karst channel. A protective net is arranged at the upper part of the drainage decompression hole; according to the drainage and pressure reduction structure, underground water which is unsmoothly drained in the water-rich karst channel is timely drained into the tunnel through the drainage and pressure reduction holes, the water pressure outside the tunnel is effectively reduced, the lining thickness of the tunnel is reduced, meanwhile, the underground water is not affected, implementation is easy and convenient, and good economic benefits and ecological benefits are achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of water conservancy engineering tunnel drainage, and in particular relates to a flood discharge tunnel drainage pressure relief structure crossing a water-rich karst channel. Background Art

[0002] During the design and construction of underground tunnels in water conservancy projects, drainage holes or concrete plugging are usually used to treat groundwater in karst channels and cave sections rich in groundwater. This method has a better effect on treating karst groundwater with small diameters, small flows and low water heads. For large-section tunnels in water-rich areas, the tunnel lining is often damaged by increased external water pressure due to untimely and unsmooth groundwater drainage. Summary of the invention

[0003] The utility model provides a flood discharge tunnel drainage pressure relief structure that crosses a water-rich karst channel to solve the shortcomings of the tunnel drainage pressure relief structure. The specific scheme is as follows:

[0004] A flood discharge tunnel drainage and pressure relief structure that crosses a water-rich karst channel comprises a flood discharge tunnel that crosses the water-rich karst channel, a plurality of drainage and pressure relief holes are arranged on the bottom plate lining of the flood discharge tunnel at intervals along its width direction, the drainage and pressure relief holes are connected to the water-rich karst channel, and a protective net is arranged on the top of the drainage and pressure relief holes.

[0005] Furthermore, the water-rich karst channel under the bottom plate lining is backfilled with large rocks.

[0006] Furthermore, crushed stones are backfilled between the bottom plate lining and the large stones.

[0007] Furthermore, the diameter of the drainage pressure relief hole is not less than 0.5m.

[0008] Furthermore, the protective net is made of rigid corrosion-resistant material.

[0009] The beneficial effects of the utility model are:

[0010] 1. The large-size drainage pressure relief holes on the tunnel floor of the utility model are directly connected to the water-rich karst channel, which can drain water quickly, effectively reduce the water pressure outside the tunnel, reduce the thickness of the tunnel lining, and have good economic efficiency;

[0011] 2. The utility model is provided with a rigid corrosion-resistant protective net on the top of the large-size drainage pressure relief hole on the tunnel floor, which improves the traffic safety during the construction and operation period;

[0012] 3. The utility model has a large flow section size through the large-size drainage pressure relief hole on the tunnel bottom plate and partially backfills large stones and gravel in the lower karst channel, which has good water permeability and is not easy to be blocked. It is simple and convenient to implement, and is convenient for lining pouring and passage during the construction period, which is beneficial to the stability of the tunnel structure during the operation period;

[0013] 4. The drainage and pressure-reducing structure of the utility model will not block the water-rich karst channel, has no influence on the circulation of groundwater, and has good ecological benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a plan view of the utility model.

[0015] Figure 2 It is a cross-sectional view of the utility model.

[0016] Figure 3 It is a longitudinal sectional view of the utility model.

[0017] Figure 4 This is a large-scale drawing of the utility model.

[0018] Among them: 1- rock mass; 2- water-rich karst channel; 3- flood discharge tunnel, 4- bottom plate lining, 5- drainage pressure relief hole; 6- protective net; 7- large stone; 8- crushed stone. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0020] See also Figure 1-4 A flood discharge tunnel drainage and pressure relief structure that crosses a water-rich karst channel comprises a flood discharge tunnel 3 that crosses a water-rich karst channel 2. The flood discharge tunnel 3 runs through a rock mass 1. A plurality of drainage and pressure relief holes 5 are arranged on a bottom plate lining 4 of the flood discharge tunnel 3 at intervals along its width direction. The drainage is fast, and the water pressure outside the tunnel can be effectively reduced, and the thickness of the tunnel lining can be reduced, so the economy is good. The drainage and pressure relief holes 5 are connected to the water-rich karst channel 2. A protective net 6 is arranged on the upper part of the drainage and pressure relief holes 5, so the traffic safety during the construction and operation period is good.

[0021] Preferably, large stones 7 are backfilled in the water-rich karst channel 2 under the bottom plate lining 4. When backfilling the large stones 7, they are backfilled one by one in parallel to facilitate water flow. The implementation is simple and convenient, which is convenient for lining pouring and passage during the construction period and is beneficial to the stability of the tunnel structure during the operation period.

[0022] Preferably, crushed stone 8 is backfilled between the bottom plate lining 4 and the large stones 7, which has good water permeability and is not easy to be blocked.

[0023] The preferred diameter of the drainage pressure relief holes 5 is not less than 0.5 m. The specific number and size of the drainage pressure relief holes 5 are determined based on the calculation of the water inflow of the water-rich karst channel 2 during the construction flood season.

[0024] The preferred protective net 6 is made of a rigid, corrosion-resistant material and has a long service life.

[0025] In addition, the water-rich karst channel 2 is connected to the flood discharge tunnel 3 through a plurality of drainage pressure relief holes 5 arranged on the tunnel lining bottom plate 4, so that the groundwater that is not drained smoothly in the water-rich karst channel 2 can be timely discharged into the flood discharge tunnel 3, thereby reducing the external water pressure acting on the lining of the flood discharge tunnel 3. The thickness of the lining of the flood discharge tunnel 3 can also be relatively reduced, so as to reduce the construction cost and have good economic performance.

[0026] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-limiting from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention, and any reference numerals in the claims should not be regarded as limiting the claims involved.

[0027] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A flood discharge tunnel drainage and decompression structure that crosses a water-rich karst channel, characterized in that: The invention comprises a flood discharge tunnel (3) crossing a water-rich karst channel (2), wherein a plurality of drainage pressure relief holes (5) are arranged at intervals along the width direction on the bottom plate lining (4) of the flood discharge tunnel (3), wherein the drainage pressure relief holes (5) are connected to the water-rich karst channel (2), and a protective net (6) is arranged on the upper part of the drainage pressure relief holes (5).

2. The flood discharge tunnel drainage and decompression structure crossing a water-rich karst channel according to claim 1, characterized in that: The water-rich karst channel (2) under the bottom plate lining (4) is backfilled with large rocks (7).

3. The flood discharge tunnel drainage and decompression structure crossing a water-rich karst channel according to claim 2, characterized in that: Crushed stones (8) are backfilled between the bottom plate lining (4) and the large stones (7).

4. The flood discharge tunnel drainage and decompression structure crossing a water-rich karst channel according to claim 1, characterized in that: The diameter of the drainage pressure relief hole (5) is not less than 0.5 m.

5. The flood discharge tunnel drainage and decompression structure crossing a water-rich karst channel according to claim 1, characterized in that: The protective net (6) is made of a rigid, corrosion-resistant material.

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