Ground drainage structure for underground cavern

Abstract

A ground drainage structure for an underground cavern relates to the technical field of underground drainage and comprises a concrete layer, and a plurality of parallel water guide grooves are formed in the top of the concrete layer; a plurality of water collecting pipes which penetrate through the concrete layer and are communicated to the bedrock are arranged at the bottom of the water guide groove, a reinforcing sealing plate covers the top surface of the water guide groove, and the water guide groove and the water collecting pipes are filled with stone; the two ends of the water guide groove are each provided with a drainage ditch in a communicated mode, a blocking net layer is arranged between the water guide groove and the drainage ditches, and a cover plate is arranged at the tops of the drainage ditches. The drainage structure not only has a firm structure, but also can fully drain water seepage of bedrock to protect the stability of the ground structure of the cavern.

Description

Technical Field

[0001] The utility model relates to the technical field of underground drainage, in particular to a ground drainage structure for an underground cavern. Background Art

[0002] With the development of my country's economy and society, large-scale construction projects are increasingly moving deeper into mountainous areas and underground. During the construction of underground caverns such as tunnels and underground powerhouses, workers or equipment will exert a certain degree of downward pressure on the cavern floor, causing water seepage in the bedrock to upwell. This influx of water will cause the bedrock soil to become loose, destroying the support of the cavern floor. Therefore, drainage engineering of the cavern floor is a key link to ensure the safe operation of underground caverns.

[0003] Traditional underground caverns primarily employ a combination of drainage and water blocking for surface waterproofing. For example, large underground powerhouses are equipped with dedicated drainage corridors, and highway tunnels have drainage culverts installed at the bottom of the road. However, high-cost active drainage engineering measures are rarely used in general underground caverns, and water blocking is the main method to address bedrock seepage. Although water blocking engineering measures can provide a waterproofing effect in the short term, after long-term use of the underground cavern floor, the seepage water pressure of the bedrock will cause water seepage damage to the tunnel surface structure, seriously affecting the safe and stable operation of the tunnel project.

[0004] In addition, waterproof materials are installed on the ground of underground caverns to prevent water seepage in the ground of underground caverns. However, the general waterproof materials of underground caverns are relatively soft, resulting in a weak interlayer in the ground structure. In addition, the conventional underground cavern ground waterproofing and drainage structure has hollow spaces, which does not fully consider the ground bearing capacity requirements. Therefore, under the action of ground loads in the later stage, the above two engineering measures are likely to cause the ground of the underground caverns to be damaged and cracked under the action of loads.

[0005] Chinese patent (CN214660341U) discloses a drainage device for underground cavern floor concrete construction in water-rich areas. The device uses gravity to collect seepage water into drainage blind pipes for drainage, preventing the seepage water from flowing everywhere and affecting the quality of the concrete, reducing construction costs, and preventing the seepage water from eroding the concrete. However, the drainage blind pipes and drainage ditches in the device are directly installed in the cavern, without considering the bearing capacity of the drainage structure. Therefore, when the drainage ditch is subjected to a large ground compression force, the drainage ditch structure and the ground are easily damaged after a long time.

[0006] Therefore, we propose a drainage structure that has a strong structure and can fully drain the bedrock seepage, thereby protecting the stability of the ground structure of the cavern. Utility Model Content

[0007] In order to overcome the deficiencies in the background technology, the utility model discloses a ground drainage structure for an underground cavern.

[0008] In order to achieve the above-mentioned purpose of the invention, the present invention adopts the following technical solutions:

[0009] A ground drainage structure for an underground cavern comprises a concrete layer, wherein a plurality of parallel water guide grooves are provided on the top of the concrete layer;

[0010] The bottom of the water channel is provided with multiple water collecting pipes that pass through the concrete layer and are connected to the bedrock. The top surface of the water channel is covered with a reinforcement cover plate. The water channel and the water collecting pipes are filled with stones. A drainage ditch is respectively connected to both ends of the water channel. A barrier net layer is provided between the water channel and the drainage ditch, and a cover plate is provided on the top of the drainage ditch.

[0011] Preferably, the concrete layer includes a leveling layer, a base layer and a surface layer cast in sequence from bottom to top, the water guide trough is located in the base layer, the water collecting pipe is located in the leveling layer, and the reinforcement sealing plate is located in the surface layer.

[0012] Preferably, the reinforced sealing plate is composed of a buffer layer and a sealing plate layer connected in sequence, and the buffer layer is arranged on the top surface of the water guide groove.

[0013] Preferably, the buffer layer is configured as geotextile.

[0014] Preferably, the sealing layer is a steel plate.

[0015] Preferably, a steel mesh layer is provided on the top of the sealing layer.

[0016] Preferably, the stone is a pebbles with a diameter of 10-30 mm.

[0017] Preferably, the barrier mesh layer is configured as a water grate.

[0018] Due to the adoption of the above-mentioned technical solution, the utility model has the following beneficial effects:

[0019] The utility model discloses a ground drainage structure for an underground cavern.

[0020] 1. The concrete layer can not only improve the firmness of the cave floor, but also effectively improve the flatness of the cave floor, making it easier for workers to walk and for machines and equipment to be transported.

[0021] 2. The stones filled in the water channel and water collecting pipe can effectively support them. At the same time, combined with the reinforced sealing plate, the structural strength of the water channel and water collecting pipe can be improved, thereby increasing the service life of the drainage structure and the cavern floor;

[0022] 3. The barrier layer can prevent stones from escaping from the water channel, further ensuring the structural strength of the water channel;

[0023] 4. The seepage water in the bedrock enters the water channel through the water collecting pipe, and then is discharged into the drainage ditch from the water channel, which effectively solves the problem of bedrock seepage and protects the cave structure from being damaged by seepage. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A structural diagram of the utility model;

[0025] Figure 2 This is a structural diagram of the water channel.

[0026] In the figure: 1. Concrete layer; 11. Leveling layer; 12. Base layer; 13. Surface layer; 2. Water guide channel; 3. Water collecting pipe; 4. Reinforcement cover plate; 41. Buffer layer; 42. Cover plate layer; 43. Steel mesh layer; 5. Stone; 6. Drainage ditch; 7. Barrier net layer; 8. Cover plate; 9. Bedrock. DETAILED DESCRIPTION

[0027] The technical solution of the present invention will be described below with reference to the accompanying drawings in the embodiments of the present invention. In the description, it should be understood that if there are terms such as "upper", "lower", "front", "rear", "left", "right" and the like indicating directions or positional relationships, these are merely corresponding to the drawings of the present invention and are for the convenience of describing the present invention. They do not indicate or imply that the devices or components referred to must have a specific direction.

[0028] Example 1 is:

[0029] Combined with attachment Figure 1-2 The ground drainage structure for an underground cavern comprises a concrete layer 1, a top of which is provided with a plurality of parallel water guide grooves 2;

[0030] In addition, the concrete layer 1 includes a leveling layer, a base layer and a surface layer cast in sequence from bottom to top, the water guide 2 is located in the base layer, the water collecting pipe 3 is located in the leveling layer, and the reinforcement sealing plate 4 is located in the surface layer;

[0031] It should be noted that when pouring the concrete layer 1, a leveling layer is first poured on the bedrock 9 using concrete, and then a plurality of parallel water guide grooves 2 are set on the leveling layer, and then concrete is poured on the leveling layer to form a base layer. Finally, the reinforcement cover plate 4 is covered on the water guide groove 2, and after the drainage ditch 6 is installed, the surface layer is poured on the base layer using concrete to complete the fixed installation of the water guide groove 2. In addition, the concrete layer 1 can also improve the hardness of the ground of the underground cavern, thereby isolating the possibility of water seepage from the bedrock 9 and facilitating the walking of workers and the transportation of equipment.

[0032] At the same time, since the water channel 2 is filled with stones 5, the water channel 2 cast in concrete has good pressure resistance and is not easily damaged, and can perform drainage work for a long time. In addition, the stones 5 filled in the water channel 2 can also support the subsequent reinforcement cover 4 on the water channel 2, thereby improving the overall structural strength of the water channel 2.

[0033] In addition, since most underground caverns are passages, the structure of an underground cavern is generally a long arch. Therefore, if multiple parallel water guide channels 2 are distributed along the length direction, on the one hand, the number of water guide channels 2 can be reduced. Although the length of each water guide channel 2 becomes longer, it will also reduce the workload of workers laying the water guide channels 2 and pouring concrete to a certain extent. If multiple parallel water guide channels 2 are distributed along the width direction, the length of each water guide channel 2 will be reduced, but the number of water guide channels 2 will be increased. Since the water absorption area of each water guide channel 2 is limited, the increase in the number of water guide channels 2 will increase the overall water absorption performance of the drainage mechanism and thus the drainage capacity.

[0034] The bottom of the water channel 2 is provided with a plurality of water collecting pipes 3 that pass through the concrete layer 1 and are connected to the bedrock 9. When workers or equipment move in the underground cavern, a certain pressure is released on the bedrock 9. After the workers or equipment leave, the pressure released on the bedrock 9 disappears, causing the bedrock 9 to rebound to a certain extent. At this time, the seepage water in the bedrock 9 will surge up, and then the seepage water will smoothly enter the water channel 2 through the water collecting pipes 3, and then the seepage water in the water channel 2 will flow out from the drainage ditch 6.

[0035] The top surface of the water channel 2 is covered with a reinforcement cover plate 4, and the water channel 2 and the water collecting pipe 3 are filled with stones 5; wherein the reinforcement cover plate 4 can facilitate workers to walk on the ground of the underground cavern and facilitate the transportation of equipment in the underground cavern;

[0036] It should be noted that the opening where the water collecting pipe 3 communicates with the bedrock 9 does not need to be provided with a blocking mechanism, because the opening at this end of the water collecting pipe 3 is in direct contact with the bedrock 9, and the bedrock 9 is a natural gap baffle;

[0037] The two ends of the water channel 2 are respectively connected to a drainage ditch 6, a barrier mesh layer 7 is provided between the water channel 2 and the drainage ditch 6, and a cover plate 8 is provided on the top of the drainage ditch 6; the barrier mesh layer 7 can block the stones 5 to prevent the stones 5 in the water channel 2 from being lost, so that the water channel 2 can effectively maintain its own structural strength. By providing the cover plate 8 on the top of the drainage ditch 6, the structure of the drainage ditch 6 can be made more complete and the ground of the underground cavern can be prevented from being vacant.

[0038] It should be noted that the same side of the multiple water guide grooves 2 is connected to a drainage ditch 6, that is, there are two drainage ditches 6, and the multiple water guide grooves 2 are respectively connected to these two drainage ditches 6; and the seepage water in the drainage ditch 6 will eventually flow into the water purification equipment, and the minerals and mud impurities in the water will be filtered out for secondary use. Since the construction of underground caverns is often in uninhabited areas, the secondary use of the seepage water from the underground bedrock 9 can alleviate the problem of water shortage during the construction of underground caverns.

[0039] In particular, the stone 5 is set to be pea stones with a diameter of 10-30 mm. If the pea stones are set to a diameter of 10 mm, the pea stones can form a relatively flat top in the water guide trough 2, thereby effectively supporting the reinforcement and sealing of the water guide trough 2, and the gaps between the pea stones are smaller, thereby making the gaps between the pea stones have a stronger water-locking ability, which can effectively prevent the bedrock 9 from seeping into the water guide trough 2 and then flowing out of the water collection pipe 3, thereby improving the water absorption capacity of the water guide trough 2; if the pea stones are set to a diameter of 30 mm, the gaps between the pea stones in the water guide trough 2 and the water collection pipe 3 will be larger. For areas with a high water content in the bedrock 9, the gaps can further increase the water absorption capacity of the water guide trough 2, and are conducive to the immediate discharge of the seepage water sucked into the water guide trough 2 from the drain ditch 6, thereby improving the drainage efficiency of the drainage structure;

[0040] In addition, the barrier mesh layer 7 is set as a water grate, which is actually a grid structure made of multiple steel sheets welded together. Therefore, it has strong structural strength and can withstand the impact of stones 5 in the water channel 2. The holes in the grid structure are generally large, which facilitates the outflow of water from the water channel 2.

[0041] Example 2 is:

[0042] On the basis of Example 1, the reinforcement sealing plate 4 is composed of a buffer layer 41 and a sealing plate layer 42 connected in sequence, and the buffer layer 41 is arranged on the top surface of the water guide trough 2, wherein the buffer layer 41 has a certain buffering effect, which is used to prevent the stone 5 from directly contacting the sealing plate layer 42, thereby causing the stone 5 to break, affecting the support of the stone 5 on the reinforcement sealing plate 4, and also affecting the water absorption and drainage effect of the water guide trough 2; In addition, the buffer layer 41 can also have a certain water absorption function, preventing water leakage caused by loose welding between the sealing plate layer 42 and the water guide trough 2, thereby affecting the workers' movement;

[0043] In addition, the buffer layer 41 covers the top of the stone 5 in the water channel 2, while the sealing layer 42 is directly welded to the top edge of the water channel 2 to achieve overall reinforcement of the water channel 2.

[0044] In particular, the buffer layer 41 is configured as a geotextile. Due to various advantages of the geotextile, such as high tensile strength, the geotextile can effectively resist the stretching and deformation of the reinforcement cover 4, thereby improving the stability of the reinforcement cover 4.

[0045] Good aging resistance, able to maintain stable performance under different environmental conditions for a long time, and not easily affected by factors such as ultraviolet rays and chemical corrosion;

[0046] High water absorption performance allows water to flow freely, reduces water accumulation in the water channel 2, and prevents water from seeping out of the sealing layer 42;

[0047] The geotextile has good filtering performance and can effectively filter the particles in the seepage water of the bedrock 9, preventing the particles from entering the reinforcement cover 4 and affecting the connection between the reinforcement cover 4 and the water channel 2;

[0048] Easy to construct: Geotextiles are usually soft and easy to cut, which makes them easy to operate and install during construction and can adapt to different shapes and terrain requirements;

[0049] High environmental protection, geotextiles are usually made of synthetic fibers, which have good renewability and recyclability and are environmentally friendly;

[0050] The sealing plate layer 42 is set as a steel plate, which has high strength and can improve the overall strength of the reinforced sealing plate 4; in addition, a steel mesh layer 43 is provided on the top of the sealing plate layer 42, and the steel mesh can further improve the overall structural strength of the reinforced sealing plate 4, and the steel mesh layer 43 is on the surface of the top layer for workers to step on, and the mesh structure itself has an anti-slip function, which is conducive to the stability of workers when moving.

[0051] The parts of the present invention that are not described in detail are prior art. It is obvious to those skilled in the art that the present invention is not limited to the details of the above-mentioned exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is limited by the appended claims rather than the above description. Therefore, it is intended that all changes that fall within the meaning and scope of the equivalent elements of the claims are included in the present invention, and any figure marks in the claims should not be regarded as limiting the claims involved.

Claims

1. A ground drainage structure for an underground cavern, characterized by: It comprises a concrete layer (1), wherein a plurality of parallel water guide grooves (2) are provided on the top of the concrete layer (1); The bottom of the water channel (2) is provided with a plurality of water collecting pipes (3) that pass through the concrete layer (1) and are connected to the bedrock (9); the top surface of the water channel (2) is covered with a reinforcement cover plate (4); the water channel (2) and the water collecting pipes (3) are filled with stone (5); the two ends of the water channel (2) are respectively connected with a drainage ditch (6); a barrier net layer (7) is provided between the water channel (2) and the drainage ditch (6), and a cover plate (8) is provided on the top of the drainage ditch (6).

2. The ground drainage structure for an underground cavern according to claim 1, wherein: The concrete layer (1) comprises a leveling layer, a base layer and a surface layer which are cast in sequence from bottom to top; the water guide trough (2) is located in the base layer; the water collecting pipe (3) is located in the leveling layer; and the reinforcement sealing plate (4) is located in the surface layer.

3. The ground drainage structure for an underground cavern according to claim 1, wherein: The reinforced sealing plate (4) is composed of a buffer layer (41) and a sealing plate layer (42) connected in sequence, and the buffer layer (41) is arranged on the top surface of the water guide groove (2).

4. The ground drainage structure for an underground cavern according to claim 3, wherein: The buffer layer (41) is configured as a geotextile.

5. The ground drainage structure for an underground cavern according to claim 3, wherein: The sealing plate layer (42) is made of a steel plate.

6. The ground drainage structure for an underground cavern according to claim 3, characterized in that: A steel mesh layer (43) is provided on the top of the sealing plate layer (42).

7. The ground drainage structure for an underground cavern according to claim 1, wherein: The stone (5) is a pea stone with a diameter of 10-30 mm.

8. The ground drainage structure for an underground cavern according to claim 1, wherein: The barrier mesh layer (7) is configured as a water grate.

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