Water drainage and pressure reduction device for high-pressure karst water-rich large-section highway tunnel

Abstract

The utility model discloses a high-pressure karst water-rich large section highway tunnel drainage and pressure reduction device, which comprises pressure reduction assemblies arranged along the axis of the tunnel in a mirroring manner and a drainage unit communicated with the two pressure reduction assemblies, the drainage unit is used for draining flowing water generated by the two pressure reduction assemblies, and each pressure reduction assembly comprises a pressure control unit, a pressure control unit and a pressure control unit, the pressure control unit comprises a gravel blind ditch arranged at the position of a tunnel wall foot and extending in the direction away from the axis of the tunnel and a water gathering pipe arranged in the gravel blind ditch. The end, close to the tunnel, of the water gathering pipe is connected with a water pressure valve. The stabilizing unit comprises a plurality of positioning ribs evenly distributed on the peripheral side of the water pressure valve and a plurality of obliquely-arranged locking anchor rods, and the ends, away from the water pressure valve, of the positioning ribs and the ends, away from the water pressure valve, of the locking anchor rods are deeply buried in the rock stratum through concrete; water pressure can be released intelligently according to the water pressure condition, drainage is started automatically when the water pressure reaches a certain degree, the threat of the water pressure in a rock stratum to a tunnel lining structure is effectively reduced, and the lining structure is prevented from being broken down and damaged due to too high water pressure.

Description

TECHNICAL FIELD

[0001] The utility model relates to tunnel engineering equipment technical field, concretely relates to a high pressure karst water-rich large section highway tunnel's drainage pressure reducing device. BACKGROUND

[0002] In the construction and operation process of high pressure karst water-rich large section tunnel, because the geological condition is complex, groundwater is rich and water pressure is higher, high water pressure continuously acts on tunnel lining structure, and great pressure is brought to lining.

[0003] When water pressure exceeds the bearing capacity of lining structure, lining structure is easily penetrated, and then damage occurs, which not only leads to tunnel water leakage, water gushing and other problems, but also seriously threatens the operation safety of tunnel, and may cause serious consequences such as tunnel collapse, vehicle and personnel being trapped and the like. CONTENT OF UTILITY MODEL

[0004] In view of the deficiency in the prior art, the utility model aims at providing a high pressure karst water-rich large section highway tunnel's drainage pressure reducing device, to solve the problem that lining structure is damaged when tunnel passes through high pressure karst water-rich section in the prior art.

[0005] According to the embodiment of the utility model, a high pressure karst water-rich large section highway tunnel's drainage pressure reducing device, including mirror image setting along the tunnel axis pressure reducing assembly and with two pressure reducing assembly communication drainage unit, drainage unit is used for discharging the water produced by two pressure reducing assembly, wherein, each pressure reducing assembly includes: pressure control unit, pressure control unit includes setting at tunnel heel and extending in the direction away from tunnel axis rubble blind ditch and setting in rubble blind ditch water collecting pipe, water collecting pipe is connected with water pressure valve near one end of tunnel, water collecting pipe is used for collecting water source in rock stratum, and water pressure valve is used for releasing water pressure;Stable unit includes multiple positioning ribs that are evenly distributed on the side of water pressure valve and multiple locking anchor rods that are inclinedly arranged, and the end of each positioning rib and each locking anchor rod away from water pressure valve is buried in rock stratum through concrete.

[0006] Compared with the prior art, the utility model have following beneficial effect: through setting the blind drain of broken stone and the water collecting pipe inside in tunnel wall foot place extension to far away tunnel axis direction, can make full use of tunnel foot special geological position, accurate collection rock stratum inside abundant water source, water collecting pipe setting in blind drain of broken stone inside forms the passage of water flow convergence, simultaneously water collecting pipe near tunnel one end connection's water pressure valve, can according to water pressure situation intelligent release water pressure, when water pressure reaches certain degree, automatic opening drainage, effectively reduce rock stratum inside water pressure to tunnel lining structure's threat, avoid because of water pressure is too high and leads to lining structure to be broken down and destroyed, guarantee tunnel safety, stable unit can from different directions to water pressure valve carry out preliminary positioning and support, make it keep stable in the process of drainage, guarantee its sustainable play drainage pressure relief function.

[0007] Preferably, the blind drain of broken stone is cylindrical and extends away from the tunnel axis, and the axis of the water collecting pipe overlaps the axis of the blind drain of broken stone.

[0008] Preferably, the water collecting pipe is uniformly distributed with multiple groups of through holes on the periphery.

[0009] Preferably, the multiple positioning ribs are perpendicular to each other and located in the same plane.

[0010] Preferably, each locking anchor rod forms a 45° angle with the corresponding positioning rib.

[0011] Preferably, the drainage unit includes a drainage pipe connected to each water pressure valve and a central drainage ditch arranged at the bottom of the tunnel, the central drainage ditch extends along the length direction of the tunnel, and each drainage pipe is in communication with the central drainage ditch at the end away from the corresponding water pressure valve.

[0012] Preferably, the central drainage ditch extends along the length direction of the tunnel.

[0013] Preferably, the water collecting pipe is made of seamless steel pipe. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is a front view of the utility model embodiment.

[0015] Figure 2 It is Figure 1 It is an enlarged view of the area A.

[0016] Figure 3 It is a front view of the pressure control unit in the utility model embodiment.

[0017] Figure 4 It is a front view of the pressure reduction assembly in the utility model embodiment.

[0018] Figure 5 It is a left view of the pressure reduction assembly in the utility model embodiment.

[0019] The reference signs in the drawings of the specification include: 1, water pressure valve; 2, positioning rib; 4, locking anchor rod; 5, gravel blind ditch; 6, water collecting pipe; 7, drain pipe; 8, central drainage ditch; 9, surrounding rock fissure. DETAILED DESCRIPTION

[0020] The technical solutions in the utility model are further described below with reference to the drawings and examples.

[0021] As Figures 1 to 5 shown in the utility model embodiment, a high-pressure karst water-rich large-section highway tunnel water discharge and pressure reduction device is provided, which comprises pressure reduction assemblies arranged in mirror image along the tunnel axis and a drainage unit communicated with the two pressure reduction assemblies, and the drainage unit is used for discharging water generated by the two pressure reduction assemblies, wherein each pressure reduction assembly comprises: a pressure control unit, which comprises a gravel blind ditch 5 arranged at the tunnel wall foot and extending away from the tunnel axis and a water collecting pipe 6 arranged in the gravel blind ditch 5, and the water collecting pipe 6 is connected with a water pressure valve 1 at one end close to the tunnel, the water collecting pipe 6 is used for collecting water sources in the rock stratum, and the water pressure valve 1 is used for releasing water pressure; and a stable unit, which comprises a plurality of positioning ribs 2 uniformly distributed on the side of the water pressure valve 1 and a plurality of locking anchor rods 4 arranged obliquely, and the ends of each positioning rib 2 and each locking anchor rod 4 away from the water pressure valve 1 are both deeply buried in the rock stratum through concrete.

[0022] The detailed working process of the embodiment is as follows: the gravel blind ditch 5 extending away from the tunnel axis and the water collecting pipe 6 inside are arranged at the tunnel wall foot, which can fully utilize the special geological position of the tunnel wall foot, the gravel blind ditch 5 extends to the deep part and is connected with the surrounding rock fissure 9, realizing hydraulic connection and accurately collecting abundant water sources in the rock stratum; the water pressure valve 1 connected at one end of the water collecting pipe 6 close to the tunnel can intelligently release water pressure according to the water pressure, and automatically opens the drainage when the water pressure reaches a certain degree, effectively reducing the threat of water pressure in the rock stratum to the tunnel lining structure, avoiding the lining structure being broken and damaged due to excessively high water pressure, and ensuring the safety of the tunnel.

[0023] The positioning rib 2 and the locking anchor rod 4 in the stable unit cooperate with each other; the plurality of positioning ribs 2 uniformly distributed on the side of the water pressure valve 1 can preliminarily position and support the water pressure valve 1 from different directions, so that the water pressure valve 1 remains stable during the drainage process. The locking anchor rod 4 arranged obliquely cooperates with the positioning rib 2, is deeply buried in the rock stratum through concrete, greatly enhances the connection strength between the water pressure valve 1 and the rock stratum, ensures that the pressure control unit is still stable under the impact of high-pressure water flow and complex geological conditions, continuously plays the drainage and pressure relief function, and further ensures the long-term stable operation of the tunnel in the karst water-rich section.

[0024] The water pressure valve 1 used in the embodiment is an electronic intelligent valve, and the pressure threshold of the water pressure valve 1 is set according to actual needs, which is set to 0.6-0.8 MPa in the embodiment. When the water pressure exceeds the threshold, the valve is opened, the karst water is introduced into the drainage unit, and automatic water drainage and pressure reduction are realized.

[0025] As shown in Figure 2 With Figure 3 As shown, the gravel blind ditch 5 is cylindrical and extends away from the tunnel axis, and the axis of the water collecting pipe 6 overlaps the axis of the gravel blind ditch 5.

[0026] The detailed working process of the embodiment is: the gravel blind ditch 5 with a cylindrical structure is more uniform in stress, and is less likely to be deformed and damaged due to water pressure under the condition of high-pressure water-rich geology, thereby ensuring the smoothness of the drainage passage. Extending away from the tunnel axis can expand the water collection range and fully collect water sources in different areas around the tunnel, thereby providing sufficient water flow source for subsequent water drainage and pressure reduction. Meanwhile, the design of overlapping the axis of the water collecting pipe 6 with the axis of the gravel blind ditch 5 enables the water collecting pipe 6 to make the most of the water collection space in the gravel blind ditch 5.

[0027] The diameter of the gravel blind ditch 5 in the embodiment is 0.3-0.4 m, and the length of the water collecting pipe 6 is 6-10 m.

[0028] As shown in Figure 3 A plurality of groups of through holes are uniformly distributed on the side of the water collecting pipe 6.

[0029] The detailed working process of the embodiment is: by providing a plurality of groups of through holes on the side of the water collecting pipe 6, the water collection range of the water collecting pipe 6 is widened, so that the water collecting pipe 6 can introduce water from any direction into the pipe in time, thereby effectively improving the collection efficiency of the water collecting pipe 6 for water sources in the rock stratum and providing sufficient water quantity guarantee for subsequent release of water pressure by the water pressure valve 1 and reduction of pressure on the lining structure.

[0030] As shown in Figure 4 And Figure 5 As shown, the plurality of positioning ribs 2 are perpendicular to each other and located in the same plane.

[0031] The detailed working process of the embodiment is: the perpendicular arrangement of the positioning ribs 2 can constrain the water pressure valve 1 from multiple directions. When high-pressure water flow impacts the water pressure valve 1 through the water collecting pipe 6, displacement or shaking of the water pressure valve 1 can be prevented.

[0032] As shown in Figure 5 Each locking anchor rod 4 forms a 45° angle with the corresponding positioning rib 2.

[0033] The detailed working process of the embodiment is that the 45° angle forms a stable triangular structure among the positioning rib 2, the locking anchor rod 4 and the rock stratum. The triangle has stability and can effectively resist the force from different directions. When the water pressure valve 1 is subjected to the water flow pressure and other external forces, the triangular structure can uniformly disperse the force into the rock stratum, reduce the deformation and displacement of the device, and thus improve the stability of the entire device; meanwhile, when the force acts on the water pressure valve 1, the locking anchor rod 4 with the 45° angle with the positioning rib 2 can disperse the force along the direction of the locking anchor rod 4 into the rock stratum. Due to the inclination angle of the locking anchor rod 4, the force forms a relatively extensive distribution area in the rock stratum in the transmission process, avoids the local concentration of the force, reduces the damage to the rock stratum, and also improves the stability and reliability of the device itself.

[0034] In the embodiment, the locking anchor rod 4 is an R25 hollow grouting anchor rod with a length of 2.0-3.0 m.

[0035] As shown in Figure 1 , the drainage unit includes drainage pipes 7 connected with the corresponding water pressure valves 1 respectively and a central drainage ditch 8 arranged at the bottom of the tunnel, and the ends of the drainage pipes 7 away from the corresponding water pressure valves 1 are in communication with the central drainage ditch 8.

[0036] As shown in Figure 1 , the central drainage ditch 8 extends along the length direction of the tunnel.

[0037] The detailed working process of the embodiment is that the direct connection of the drainage pipe 7 with the water pressure valve 1 can provide a direct and efficient drainage channel for the high-pressure water flow at the moment of opening the water pressure valve 1 for pressure relief, can avoid the gathering and overflowing of the water flow, and reduce the impact on the surrounding structure. Meanwhile, under the arrangement of the central drainage ditch 8, the drainage pipe 7 converges the water discharged from the water pressure valve 1 to the central drainage ditch 8, utilizes the characteristic that the central drainage ditch 8 extends along the length direction of the tunnel, orderly discharges the water from the tunnel, completes the entire drainage and pressure relief process, and ensures that the high-pressure water does not accumulate in the tunnel.

[0038] As shown in Figure 1 , the water collecting pipe 6 is made of a seamless steel pipe.

[0039] The detailed working process of the embodiment is that the seamless steel pipe has the characteristic of high strength, can effectively resist such high pressure, prevent the problems such as pipe wall rupture and deformation caused by excessive pressure, can maintain a more stable structure when bearing the same pressure, and ensures that the water source continuously and stably flows into the water collecting pipe 6, providing reliable guarantee for the subsequent water discharge and pressure relief process.

[0040] In the embodiment, the water collecting pipe 6 is made of a seamless steel pipe with a diameter of 108 mm and a wall thickness of 6 mm.

[0041] The implementation principle of the embodiment of the application is: first, according to the actual situation, a gravel blind ditch 5 is arranged at a required position, one end of a water collecting pipe 6 connected with the water pressure valve 1 is arranged in the gravel blind ditch 5, then the water pressure valve 1 is fixed through the positioning rib 2 and the locking anchor rod 4, the pressure threshold of the water pressure valve 1 is arranged according to the actual situation, the water pressure valve 1 is connected with a drain pipe 7, finally the drain pipe 7 is arranged in a central drainage ditch 8, and the drainage pressure relief function can be realized.

[0042] Finally, it should be pointed out that the above embodiments are only used to illustrate the technical solutions of the present application and are not limiting. Although the present application has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present application can be modified or replaced equivalently without departing from the spirit and scope of the technical solutions of the present application, and all should be covered in the scope of the claims of the present application.

Claims

1. A water drainage and pressure reduction device for a high-pressure karst water-rich large-section highway tunnel, characterized in that, include: A pressure-reducing assembly mirror-imaged along the tunnel axis and a drainage unit connected to both pressure-reducing assemblies, the drainage unit being used to discharge the water generated by the two pressure-reducing assemblies, wherein each pressure-reducing assembly includes: The pressure control unit includes a gravel blind ditch (5) located at the foot of the tunnel wall and extending away from the tunnel axis, and a water collection pipe (6) located in the gravel blind ditch (5). The end of the water collection pipe (6) near the tunnel is connected to a water pressure valve (1). The water collection pipe (6) is used to collect water from the rock strata, and the water pressure valve (1) is used to release water pressure. The stabilizing unit includes multiple positioning ribs (2) evenly distributed around the water pressure valve (1) and multiple inclined locking anchor rods (4). The ends of each positioning rib (2) and each locking anchor rod (4) away from the water pressure valve (1) are buried deep in the rock stratum through concrete.

2. The water drainage and pressure reduction device for a high-pressure karst water-rich large-section highway tunnel according to claim 1, characterized in that: The gravel blind drain (5) is cylindrical and extends away from the tunnel axis, and the axis of the water collection pipe (6) overlaps with the axis of the gravel blind drain (5).

3. A water drainage and pressure reduction device for a high-pressure karst water-rich large-section highway tunnel according to any one of claims 1 to 2, characterized in that: The water collection pipe (6) has multiple sets of through holes evenly distributed around its periphery.

4. The water drainage and pressure reduction device for a high-pressure karst water-rich large-section highway tunnel according to claim 1, characterized in that: The multiple positioning ribs (2) are perpendicular to each other and located in the same plane.

5. The water drainage and pressure reduction device for a high-pressure karst water-rich large-section highway tunnel according to claim 4, characterized in that: Each of the locking anchor rods (4) forms a 45° angle with the corresponding positioning bar (2).

6. The water drainage and pressure reduction device for a high-pressure karst water-rich large-section highway tunnel according to claim 1, characterized in that: The drainage unit includes drainage pipes (7) connected to the corresponding water pressure valves (1) and a central drainage ditch (8) located at the bottom of the tunnel. The end of each drainage pipe (7) away from the corresponding water pressure valve (1) is connected to the central drainage ditch (8).

7. The water drainage and pressure reduction device for a high-pressure karst water-rich large-section highway tunnel according to claim 6, characterized in that: The central drainage ditch (8) extends along the length of the tunnel.

8. The water drainage and pressure reduction device for a high-pressure karst water-rich large-section highway tunnel according to claim 3, characterized in that: The water collection pipe (6) is made of seamless steel pipe.

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