Steel pipe concrete underground reservoir artificial dam body

Abstract

The application discloses a kind of underground reservoir artificial dam of steel pipe concrete, comprising the following steps: the underground reservoir is surveyed, and the height of the liaison lane, width, surrounding coal rock mass type, collapse degree and overall structure are determined;After determining the overall situation, necessary material instruments such as seamless steel pipe and joint sleeve are transported to the liaison lane for assembly, partial welding;Dam body support clamping groove is well dug according to size;According to clamping groove, assemble steel pipe, and maintain the overall structure stability of steel pipe before grouting by punching top rod into steel pipe surface at steel pipe connecting pipe position;After steel pipe assembly, overall welding is completed, concrete is poured by mine hydraulic grouting pump through grouting port;Electric vibrator is vibrated, and coal gangue mortar is backfilled in clamping groove part;After steel pipe concrete is completed, steel mesh grid is welded, and artificial dam is poured.The application realizes the combination of steel pipe concrete support and artificial dam in the prior art, improves the bearing capacity of artificial dam, and ensures the long-term safe operation of underground reservoir.

Description

Technical Field

[0001] This invention relates to the field of underground reservoir construction technology, and in particular to an artificial dam body for a steel-concrete underground reservoir. Background Technology

[0002] Western my country faces numerous challenges, including a fragile ecological environment and severe water shortages. Coal mining further exacerbates regional water level decline and surface structural damage. Achieving green mining is a major challenge that the coal industry must overcome to achieve high-quality development. The underground coal mine reservoir technology was proposed by the "Coal Mining Water Resources Protection and Utilization" technical team of the State Energy Group. Underground coal mine reservoir projects have been successfully applied in areas such as the Shendong mining area in western China. The long-term safe use of the artificial dam body is a crucial guarantee for the long-term safe operation of the underground reservoir, and its stability is one of the key factors for its construction and long-term safe use.

[0003] Concrete-filled steel pipe (CPVC) supports are a common method used for roadway support in coal mining. These supports consist of a steel pipe shell and an inner concrete filling. CPVC components offer structural advantages such as high bending stiffness, non-anisotropic properties, and resistance to torsional deformation.

[0004] Currently, artificial dams often exhibit uniformly distributed failures in the central areas of both sides, the central area of ​​the top, and near the embedded parts of the dam due to insufficient load-bearing capacity, failing to meet the long-term stability requirements of underground reservoir dams. Therefore, there is an urgent need for a method to improve the load-bearing capacity of artificial dams to solve these problems. Summary of the Invention

[0005] The technical solution of this invention to solve the above problems is a steel-concrete composite underground reservoir artificial dam, comprising the following steps:

[0006] a. Conduct an investigation of the underground reservoir to determine the number of artificial dams to be installed, the height h and width l of the connecting tunnel, determine that the surrounding coal and rock mass is sandstone, siltstone, mudstone, etc., and determine the degree of collapse of the connecting tunnel and the specific location of the collapse.

[0007] b. After determining the overall situation, transport the necessary materials and equipment, such as seamless steel pipes and joint sleeves, to the connecting tunnel for assembly and welding. The seamless steel pipe model is Φ219×8mm. Based on the dimensions of the connecting tunnel, the diameter of the steel-concrete underground reservoir artificial dam is D=1.2max{l,h}, and the required seamless steel pipe length for a single dam body is 0.5D. 2The π section can be transported to the connecting tunnel in 4-5 segments. The joint sleeve is Φ325×10mm, with its inner diameter fitting to the outer diameter of the seamless steel pipe before welding. The jacking rod is Φ76×5mm, and its insertion position should correspond to the connecting pipe position. The connecting pipe is Φ89×5mm, used to connect two annular seamless steel pipes, and is welded. In the connecting tunnel, the segmented seamless steel pipes are first welded to the connecting pipe to facilitate overall assembly and determine the jacking rod insertion position.

[0008] c. Based on the actual situation, excavate the dam support slots according to the specified dimensions. The dimensions of the slots on both sides of the dam support are 0.1m:1m:0.73m:h, and the dimensions of the slot on the bottom side of the dam support are 1m:0.2m:h. The slot dimensions can be adjusted appropriately according to the actual situation. The distance between the steel pipe support and the surrounding rock on both sides should be less than 15mm.

[0009] d. After the pre-excavated slots are completed, anchor bolts are driven into both sides of each slot from the outside to reinforce the surrounding rock mass according to the actual situation. The anchor bolts should not be driven from the inside of the slot to the outside, and the anchor bolts should not penetrate the slot when driven from the outside, so as not to affect the placement of the dam body.

[0010] e. Assemble the steel pipe support according to the slot, and drive the top rod through the surface of the steel pipe at the position of the steel pipe connection pipe to maintain the overall structural stability of the steel pipe before grouting.

[0011] f. After the steel pipe is installed and placed in the slot, use a mining hydraulic grouting pump to inject C40 concrete through the grouting port. Keep the vent hole unobstructed during the grouting process. Before the grouting is finished, about one bucket of concrete will flow out of the top vent hole as a marker point. After the grouting is finished, use an electric vibrator to compact the concrete. After compaction, seal the vent hole and grouting hole with a metal cap and weld them.

[0012] g. After the steel pipe concrete is completed, weld the steel mesh according to the dimensions, fix the distribution bars and steel cage according to the preset, and then pour the wall with C40 steel fiber concrete.

[0013] h. After pouring, the gaps on both sides, bottom, and top are backfilled with coal gangue mortar to form a whole with the surrounding rock mass, ensuring uniform stress. The weight proportions of the coal gangue mortar are: cement 60-70, lime 50-60, coal gangue 300-350, fine sand 1000-1100, plasticizer 0.3-0.4, gypsum 10-20, and water-cement ratio 0.55-0.75. After backfilling, waterproof gel or waterproof coating is applied to the connection between the dam body and the slots and top to enhance the sealing of the connection and reduce the seepage of the coal and rock mass and the dam body. Attached Figure Description

[0014] Figure 1 This is a flowchart illustrating the construction process of the steel-concrete underground reservoir artificial dam in this embodiment of the invention.

[0015] Figure 2 This is a schematic diagram of the steel pipe arrangement in the steel-concrete underground reservoir dam body according to an embodiment of the present invention;

[0016] Figure 3 This is a schematic diagram of the steel pipe arrangement and reinforcement distribution of the steel-concrete underground reservoir dam body in an embodiment of the present invention;

[0017] Figure 4 This is a front view of the steel pipe arrangement of the steel pipe underground reservoir dam body in this embodiment of the invention;

[0018] Figure 5 This is a front view of the steel reinforcement distribution of the concrete-filled steel pipe underground reservoir dam in this embodiment of the invention;

[0019] Figure 6 This is a front view of the steel-concrete underground reservoir dam in an embodiment of the present invention.

[0020] In the diagram: 1. Seamless steel pipe; 2. Joint sleeve; 3. Connecting pipe; 4. Grouting hole; 5. Top rod; 6. Vent hole; 7. Reinforcing cage; 8. Stirrups; 9. Transverse distribution bars; 10. Longitudinal distribution bars; 11. Structural reinforcement bars; 12. Reinforced concrete dam body; 13. Top backfill area. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0022] like Figure 1 As shown, the construction process of this invention is specifically illustrated by the assembly and construction of an artificial dam in a mining area.

[0023] A steel-concrete composite underground reservoir artificial dam body includes the following steps:

[0024] a. Conduct a comprehensive survey of the underground reservoir to determine the number of artificial dams to be installed, the height h and width l of the connecting tunnel, determine that the surrounding coal and rock mass is sandstone, siltstone, mudstone, etc., and determine the degree of collapse of the connecting tunnel and the specific location of the collapse.

[0025] b. After determining the overall situation of the underground reservoir, seamless steel pipe of type 1 with Φ219×8mm is selected. Based on the dimensions of the connecting tunnel, the diameter of the artificial dam body of the steel-concrete underground reservoir is D=1.2max{l,h}, and the length of seamless steel pipe required for a single dam body is 0.5D. 2 π can be transported in 4-5 sections to the connecting tunnel for welding and assembly.

[0026] c. The inner diameter of the joint sleeve 2 is fitted with the outer diameter of the seamless steel pipe 1. The joint sleeve 2 is Φ325×10mm, and then welding is performed.

[0027] d. The number and insertion position of the push rod 5 should correspond to the position of the connecting pipe 3. The push rod 5 is Φ76×5mm.

[0028] e. Connecting pipe 3 is used to connect two annular seamless steel pipes 1, with a model of Φ89×5mm, which are then cut and welded.

[0029] f. In the connecting tunnel, the segmented seamless steel pipes are first welded to the connecting pipes to facilitate overall assembly and determine the position of the top rod.

[0030] g. The dimensions of the slots on both sides of the dam support are 0.1m:1m:0.73m:h, and the dimensions of the slot on the bottom side of the dam support are 1m:0.2m:h. These dimensions can be adjusted as needed based on actual conditions. The distance between the steel pipe support inserted into the slot and the surrounding rock on both sides should be less than 15mm.

[0031] h. After the pre-excavated slots are completed, anchor bolts are driven into both sides of each slot from the outside to reinforce the surrounding rock mass according to the actual situation. The anchor bolts should not be driven from the inside of the slot to the outside, and the anchor bolts should not penetrate the slot when driven from the outside, so as not to affect the placement of the dam body.

[0032] i. After assembling the steel pipe support, drive the top rod 5 through the surface of the steel pipe at the position of the steel pipe connecting pipe 3 to maintain the stability of the overall structure of the steel pipe before grouting.

[0033] j. After the steel pipe is assembled, welded, and placed into the slot, C40 concrete is injected through grouting hole 4 using a mining hydraulic grouting pump. During the grouting process, vent hole 6 is kept unobstructed. Depending on the actual situation, if the construction of the connecting tunnel is inconvenient, grouting hole 4 and vent hole 6 can be prefabricated on the ground.

[0034] k. Before the grouting is completed, about one bucket of concrete flows out of the top vent hole as a marker of the end point.

[0035] 1. After grouting is completed, use an electric vibrator to compact the concrete. After compaction, seal the vent hole 6 and grouting hole 4 with metal caps and weld them.

[0036] m. After fixing the steel cage 7, stirrups 8, transverse distribution bars 9, longitudinal distribution bars 10 and structural bars 11 according to the preset, pour the wall with C40 steel fiber concrete.

[0037] The weight percentages of each component in the coal gangue mortar are as follows: cement 60-70, lime 50-60, coal gangue 300-350, fine sand 1000-1100, plasticizer 0.3-0.4, gypsum 10-20, and water-cement ratio 0.55-0.75. The gaps on both sides, bottom, and top are filled with coal gangue mortar to make the steel pipe concrete form an integral whole with the surrounding rock mass, ensuring uniform stress distribution.

[0038] o. After backfilling is completed, apply waterproof gel or spray waterproof coating at the connection between the dam body and the slot and top to enhance the sealing of the connection and reduce the seepage of coal and rock mass and dam body.

[0039] This invention combines the existing steel-concrete composite support structure with the artificial dam body, improving the load-bearing capacity of the artificial dam body and ensuring the long-term safe operation of the underground reservoir.

[0040] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A construction method of a steel pipe reinforced concrete underground reservoir artificial dam, characterized by, It comprises the following steps: a. Surveying the underground reservoir to determine the height h, width l, surrounding coal rock type, caving degree and overall structure of the connecting roadway; b. After determining the overall profile, transporting seamless steel pipes, joint sleeves, necessary materials and instruments to the connecting roadway for assembly and partial welding; c. According to the actual situation, digging a dam support clamping groove in size, and reinforcing the surrounding rock by driving anchor rods into the clamping groove; d. Assembling the steel pipe according to the clamping groove size, and driving a jacking rod through the surface of the steel pipe at the position of the connecting pipe to maintain the overall structural stability of the steel pipe before grouting; e. After the steel pipe assembly and overall welding are completed, pouring C40 concrete through the grouting port using a mine hydraulic grouting pump, and vibrating the concrete to make it dense using an electric vibrator; f. After the steel pipe concrete is completed, welding a steel mesh grid according to the size, and pouring the artificial dam body; g. After pouring is completed, backfilling the clamping groove and top gap with coal gangue slurry, and performing anti-seepage treatment on the dam body after backfilling is completed; in step g, the clamping groove on both sides, the bottom side and the top gap are backfilled with coal gangue slurry to form an overall structure of the steel pipe concrete and the surrounding rock, and to make the stress uniform, and the weight fractions of the coal gangue slurry are as follows: cement 60-70, lime 50-60, coal gangue 300-350, fine sand 1000-1100, plasticizer 0.3-0.4, gypsum 10-20, and water-cement ratio 0.55-0.75; after backfilling is completed, applying waterproof gel or spraying waterproof paint at the connection between the artificial dam body and the clamping groove and the top; In step b, after determining the overall profile of the underground reservoir, a seamless steel pipe model Φ219x8mm is selected, according to the size of the connecting lane, the diameter of the steel pipe concrete underground reservoir dam body is D=1.2max{l,h}, and the seamless steel pipe required for a single dam body is 0.5D 2 π, segmented transportation to the connecting lane in 4-5 segments; the joint sleeve model is Φ325x10mm, the joint sleeve inner diameter is embedded with the seamless steel pipe outer diameter; the connecting pipe model is Φ89x5mm, used for connecting two annular seamless steel pipes; in step b, the segmented seamless steel pipe and the connecting pipe are welded in the connecting roadway to facilitate overall assembly and determine the position of the jacking rod.

2. The construction method of a concrete underground reservoir artificial dam body of a steel pipe according to claim 1, characterized in that, in step c, the length, width and height dimensions of the clamping groove on both sides of the dam support are 0.1max{l,h}:1m:0.73max{l,h}, the length, width and height dimensions of the clamping groove on the bottom side of the dam support are max{l,h}:1m:0.2max{l,h}, the clamping groove size is adjusted appropriately according to the actual situation, and the distance between the steel pipe support and the surrounding rock on both sides is less than 15mm.

3. The construction method of a concrete underground reservoir artificial dam body of a steel pipe according to claim 1, characterized in that, in step c, after the pre-digging clamping groove is completed, anchor rods are driven from the outside into each clamping groove on both sides, and the surrounding rock is reinforced according to the actual situation, the direction of the anchor rod cannot be from the inside of the clamping groove to the outside, and the anchor rod cannot be driven from the outside to penetrate the clamping groove to avoid affecting the placement of the dam body.

4. The construction method of a concrete underground reservoir artificial dam body of a steel pipe according to claim 1, characterized in that, in step d, the steel pipe support is assembled according to the clamping groove size, and a jacking rod is driven through the surface of the steel pipe at the position of the connecting pipe before the steel pipe support is placed in the clamping groove, the jacking rod is of Φ76×5mm type, and the jacking rod driving position should correspond to the position of the connecting pipe.

5. The construction method of a concrete underground reservoir artificial dam body of a steel pipe according to claim 1, characterized in that, in step e, after the steel pipe overall construction is completed and placed in the clamping groove, a mine hydraulic grouting pump is used to pour C40 concrete through the grouting port, the grouting process is kept smooth, and 1 bucket of concrete flows out of the top exhaust hole as an end marker before the grouting is completed; after grouting is completed, the concrete is vibrated to make it dense using an electric vibrator, the exhaust hole and the grouting hole are sealed with a metal cover after vibration, and welding treatment is performed.

6. The construction method of a concrete underground reservoir artificial dam body of a steel pipe according to claim 1, characterized in that, in step f, the distributed reinforcement and the steel reinforcement cage are fixed according to the preset, and the wall body is poured with C40 steel fiber reinforced concrete.

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