Controllable layered air curtain anti-seepage water-stop gas injection system, device and method

Abstract

The invention relates to the technical field of underground anti-seepage water-stop precipitation, in particular to a controllable layered air curtain anti-seepage water-stop gas injection system, device and method. The system comprises a compressor, a connecting pipe control valve and a layered gas injection device, the layered gas injection device comprises a plurality of layer packers which are horizontally arranged, a connecting pipe and a gas injection pipe, the connecting pipe and the gas injection pipe vertically penetrate through the layer packers, and the connecting pipe control valve is located at the inlet end of the connecting pipe; a connecting pipe control valve is used for controlling a connecting pipe to fill water into the hole wall of the drill hole, and a closed gas injection cavity is formed in the drill hole through two adjacent layer packers; the compressor is located at the inlet end of the gas injection pipe, a gas injection opening is formed in a pipe body of the gas injection pipe, and compressed gas generated by the compressor is conveyed from the gas injection pipe to the gas injection cavity through the gas injection opening and enters the soil body around the drill hole, so that an anti-seepage water-gas-stopping curtain wall is formed. The device can be used for layered seepage prevention and water stop, and preparation is made for vacuum dewatering, rapid drainage and layered grouting after drainage.

Description

Technical Field

[0001] The present disclosure relates to the technical field of underground anti-seepage, water-stopping and dewatering, and in particular to a controllable layered air curtain anti-seepage, water-stopping and air injection system, equipment and method. Background Art

[0002] With the continuous development and utilization of underground space, various underground projects have gradually emerged. Waterproofing and dewatering are common and important issues in underground projects. Grouting is often used to reinforce the ground to prevent water from entering. Anti-seepage water-stopping curtains are a key technology used in underground projects to prevent or reduce groundwater inflow into foundation pits or dam bodies. These structures are typically constructed around the construction area to effectively prevent the influx of surrounding groundwater.

[0003] In related technologies, numerous research institutions have developed various anti-seepage and water-stopping structures and construction techniques, achieving considerable progress. Common construction methods include underground continuous walls, deep mixing piles, and high-pressure rotary jet grouting. Anti-seepage and water-stopping curtain technology has been widely used in various fields, including water conservancy projects, underground engineering, and environmental management. However, these methods often struggle with precise, layered grouting, resulting in suboptimal grouting results. Summary of the Invention

[0004] In view of the above problems, the present disclosure is proposed. The present disclosure provides a controllable layered air curtain anti-seepage and water-stopping air injection system, equipment and method.

[0005] According to one aspect of the present disclosure, a controllable stratified air curtain anti-seepage and water-stopping air injection system is provided, comprising a compressor, a connecting pipe control valve, and a stratified air injection device arranged in a borehole on the periphery of a construction area. The stratified air injection device comprises a plurality of horizontally arranged layer packers, and a connecting pipe and an air injection pipe vertically passing through the plurality of layer packers. The periphery of each layer packer is provided with an elastic rubber sealing ring. The connecting pipe control valve is located at the inlet end of the connecting pipe. The connecting pipe control valve is used to control the connecting pipe to fill the borehole wall with water, thereby forming a closed air injection cavity in the borehole through two adjacent layer packers.

[0006] The compressor is located at the inlet end of the air injection pipe, and an air injection port is provided on the pipe body of the air injection pipe. The compressed gas generated by the compressor is transported from the air injection pipe to the air injection cavity through the air injection port, and enters into the surrounding soil of the drilled hole in contact with the air injection cavity, forming an anti-seepage and water-stopping air curtain wall.

[0007] According to another aspect of the present disclosure, a controllable layered air curtain anti-seepage and water-stopping air injection equipment is provided, including a controllable layered air curtain anti-seepage and water-stopping air injection system and a vacuum dewatering system as described in the embodiment of the present disclosure, wherein the air curtain anti-seepage and water-stopping air injection system is used to form an anti-seepage and water-stopping air curtain wall on the periphery of the construction area, and the vacuum dewatering system is located on the outside of the anti-seepage and water-stopping air curtain wall, and is used to discharge the groundwater outside the anti-seepage and water-stopping air curtain wall.

[0008] Another aspect of the exemplary embodiments of the present disclosure provides a controllable layered air curtain anti-seepage and water-stopping method, which is applied to the controllable layered air curtain anti-seepage and water-stopping gas injection equipment as described in the embodiments of the present disclosure, and the method includes:

[0009] Drill holes in a circle at preset distances along the perimeter of the construction area;

[0010] The stratified gas injection device is vertically pressed into the borehole, and the connecting pipe control valve is used to control the connecting pipe to fill the borehole wall with water, so as to form a closed gas injection cavity in the borehole through two adjacent stratum packers;

[0011] The compressed gas generated by the compressor is transported from the gas injection pipe to each of the gas injection cavities through the gas injection port of the gas injection pipe, and enters into the surrounding soil of the drilled holes in contact with each of the gas injection cavities to form an anti-seepage and water-stopping gas curtain wall;

[0012] The groundwater outside the anti-seepage and water-stopping air curtain wall is discharged using a vacuum dewatering system.

[0013] As will be described in detail below, according to the controllable layered air curtain anti-seepage and water-stopping air injection system, equipment and method of the embodiment of the present disclosure, the controllable layered air curtain anti-seepage and water-stopping air injection system includes a compressor, a connecting pipe control valve, and a layered air injection device arranged in a borehole on the periphery of the construction area. The layered air injection device includes a plurality of horizontally arranged layer seals, and a connecting pipe and an air injection pipe vertically passing through the plurality of layer seals. The periphery of each layer seal is provided with an elastic rubber sealing ring, and the connecting pipe control valve is located at the inlet end of the connecting pipe; the connecting pipe control valve is used to control the connecting pipe to fill the borehole wall with water, and a closed air injection cavity is formed in the borehole through two adjacent layer seals; the compressor is located at the inlet end of the air injection pipe, and an air injection port is provided on the pipe body of the air injection pipe. After the compressed gas generated by the compressor, the compressed gas enters the air injection pipe, is output to the air injection cavity through these air injection ports, and enters the surrounding soil of the borehole in contact with the air injection cavity, and forms an anti-seepage and water-stopping air curtain wall in the surrounding soil of the borehole.

[0014] Based on this, the controllable layered air curtain anti-seepage and water-stopping gas injection system provided in the embodiment of the present disclosure can be used to use a layered gas injection device to separate the boreholes on the periphery of the construction area into multiple gas injection strata in the vertical direction, and form a closed gas injection cavity in each gas injection stratum; then a compressor is used to generate compressed gas, and the compressed gas is injected into the gas injection cavities of multiple gas injection strata respectively through the gas injection pipe with the gas injection port in the layered gas injection device to achieve precise layered gas injection; after the compressed gas diffuses in the soil and reaches a stable state, a complete anti-seepage and water-stopping air curtain wall is formed around the construction area. The anti-seepage and water-stopping air curtain wall can be used to squeeze the groundwater around the borehole, causing it to flow or seep away from the borehole, thereby preventing groundwater from entering the borehole, achieving layered anti-seepage and water-stopping protection for the construction area, and then preparing for vacuum dewatering, rapid drainage, and layered grouting after drainage. That is to say, the air curtain anti-seepage and water-stopping air injection system can be used to form a circumferentially and vertically distributed multi-layer anti-seepage and water-stopping air curtain wall around the holes drilled on the periphery of the construction area, thereby achieving layered anti-seepage and water-stopping. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The above and other purposes, features, and advantages of the present disclosure will become more apparent through a more detailed description of the embodiments of the present disclosure in conjunction with the accompanying drawings. The accompanying drawings are intended to provide a further understanding of the embodiments of the present disclosure and constitute a part of the specification. Together with the embodiments of the present disclosure, they are used to explain the present disclosure and are not intended to limit the present disclosure. In the drawings, the same reference numerals generally represent the same components or steps.

[0016] Figure 1 A schematic diagram of the structural principle of a controllable layered air curtain anti-seepage and water-stopping air injection device provided by an exemplary embodiment of the present disclosure is shown;

[0017] Figure 2 A schematic diagram of the three-dimensional structure of a layered gas injection device provided by an exemplary embodiment of the present disclosure is shown;

[0018] Figure 3 FIG2 shows an axonometric structural diagram of a layered gas injection device provided by an exemplary embodiment of the present disclosure;

[0019] Figure 4 A top view of a stratum packer structure provided by an exemplary embodiment of the present disclosure is shown;

[0020] Figure 5 A schematic flow chart of a controllable layered air curtain anti-seepage and water-stopping method provided by an exemplary embodiment of the present disclosure is shown.

[0021] Reference numerals:

[0022] 1000-Air curtain anti-seepage and water-stopping air injection equipment, 1100-Air curtain anti-seepage and water-stopping air injection system, 1200-Vacuum dewatering system, 1-Air injection pipe, 2-Air injection valve, 3-Connecting pipe, 4-Cable pipe, 5-Oil supply pipe, 6-Air injection cavity, 7-Layer packer, 8-Double-acting hydraulic telescopic cylinder, 9-Flow sensor, 10-Pressure sensor, 11-Conical plug, 12-Oil outlet, 13-Oil inlet, 14-Piston, 15-Pressure Compressor, 16-gas pressure regulating valve, 17-gas flow meter, 18-hydraulic control valve, 19-connecting pipe control valve, 20-pressure control valve, 21-pressure display gauge, 22-compressed gas, 23-anti-seepage and water-stopping gas curtain wall, 24-well point pipe, 25-filter head, 26-elastic rubber sealing ring, 27-metal structure, 28-connecting pipe, 29-first through hole, 30-second through hole, 31-third through hole, 32-fourth through hole. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solutions and advantages of the present disclosure more apparent, the following will describe in detail exemplary embodiments of the present disclosure with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, rather than all the embodiments of the present disclosure, and it should be understood that the present disclosure is not limited to the exemplary embodiments described herein.

[0024] It should be understood that the various steps described in the method embodiments of the present disclosure may be performed in different orders and / or in parallel. In addition, the method embodiments may include additional steps and / or omit the steps shown. The scope of the present disclosure is not limited in this respect.

[0025] The term "including" and its variations used in this document are open inclusions, that is, "including but not limited to". The term "based on" means "based at least in part on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one other embodiment"; the term "some embodiments" means "at least some embodiments". The relevant definitions of other terms will be given in the description below. It should be noted that the concepts of "first", "second", etc. mentioned in this disclosure are only used to distinguish different devices, modules or units, and are not used to limit the order or interdependence of the functions performed by these devices, modules or units.

[0026] It should be noted that the modifications of "one" and "multiple" mentioned in the present disclosure are illustrative rather than restrictive, and those skilled in the art should understand that unless otherwise clearly indicated in the context, they should be understood as "one or more".

[0027] The names of the messages or information exchanged between multiple devices in the embodiments of the present disclosure are only used for illustrative purposes and are not used to limit the scope of these messages or information.

[0028] At present, in the field of underground anti-seepage, water-stopping and dewatering in engineering practice, the most commonly used method is to form an impermeable water-stop curtain underground through underground continuous walls, grouting or high-pressure rotary jet piles combined with bored cast-in-place piles and other forms of support structures, and then dewater the pit through well points. Although this water-stop curtain has a good water-stopping effect and can easily reduce the groundwater level in the pit. However, the construction is difficult, the construction accuracy and quality requirements are high, the grouting effect of each layer cannot be guaranteed, and it has a certain impact on the surrounding environment. Once a problem occurs, maintenance and repair may be more difficult, which will lead to increased costs and extended construction period. It can be seen that traditional water-stopping and dewatering methods have the disadvantages of high cost, long construction period, environmental pollution, and the inability to guarantee accurate grouting and water-stopping.

[0029] Therefore, in order to solve the above problems, the embodiments of the present disclosure provide a controllable layered air curtain anti-seepage and water-stopping air injection system, equipment and method. The controllable layered air curtain anti-seepage and water-stopping air injection system can introduce compressed gas into multiple layers of soil along the periphery of the construction area in layers to achieve precise layered air injection. After the compressed gas diffuses in the soil and reaches a stable state, a complete anti-seepage and water-stopping air curtain wall is formed around the construction area, thereby preparing for vacuum precipitation, rapid drainage, and layered grouting after drainage.

[0030] The embodiment of the present disclosure provides a controllable layered air curtain anti-seepage and water-stopping air injection device. Figure 1 The schematic diagram of the structure principle of the controllable layered air curtain anti-seepage and water-stopping air injection equipment provided by the exemplary embodiment of the present disclosure is shown as follows: Figure 1 As shown, the controllable layered air curtain anti-seepage and water-stopping air injection equipment 1000 includes a controllable layered air curtain anti-seepage and water-stopping air injection system 1100 and a vacuum dewatering system 1200. The air curtain anti-seepage and water-stopping air injection system 1100 is used to form an anti-seepage and water-stopping air curtain wall on the periphery of the construction area, and the vacuum dewatering system 1200 is located on the outside of the anti-seepage and water-stopping air curtain wall and is used to discharge the groundwater outside the anti-seepage and water-stopping air curtain wall.

[0031] Here, vacuum dewatering system 1200 may include a vacuum pump (not shown), a wellpoint pipe 24, and a filter head 25. Filter head 25, located at the lower end of wellpoint pipe 24, filters out large impurities in the groundwater, preventing them from entering the wellpoint and pumping system, potentially causing blockage or damage. A vacuum pump then filters groundwater through filter head 25 before it enters wellpoint pipe 24, where it is then pumped out, achieving rapid drainage.

[0032] like Figure 1 As shown, the air curtain anti-seepage and water-stopping air injection system 1100 includes a compressor 15, a connecting pipe control valve 19, and a layered air injection device arranged in a drilled hole on the periphery of the construction area. Figure 2 A schematic diagram of the three-dimensional structure of a layered gas injection device provided by an exemplary embodiment of the present disclosure is shown. Figure 3 FIG. 1 shows an axonometric structural diagram of a layered gas injection device provided by an exemplary embodiment of the present disclosure. Figure 2 and Figure 3 As shown, the layered gas injection device includes multiple horizontally arranged layer packers 7, and connecting pipes 3 and gas injection pipes 1 that vertically pass through the multiple layer packers 7. The outer periphery of each layer packer 7 is provided with an elastic rubber sealing ring 26, and the connecting pipe control valve 19 is located at the inlet end of the connecting pipe 3. The connecting pipe control valve 19 is used to control the connecting pipe 3 to fill the borehole wall with water, and a closed gas injection cavity 6 is formed in the borehole through two adjacent layer packers 7. Here, the borehole can be a circle of foundation pits pre-arranged along the periphery of the construction area. The foundation pits can be arranged at a preset distance, which can be determined according to actual needs and is not specifically limited in the embodiments of the present disclosure.

[0033] Figure 4 FIG. 1 shows a top view of a stratum packer structure provided by an exemplary embodiment of the present disclosure, as shown in FIG. Figure 4 As shown, the layer packer 7 is composed of an elastic rubber sealing ring 26 and a metal structure 27; wherein the elastic rubber sealing ring 26 can absorb water and expand, and is used to fill the gap between the layer packer 7 and the wall of the borehole after being filled with water; the metal structure 27 can be made of a metal with greater rigidity, and the metal with greater rigidity is preferably steel, stainless steel, etc.

[0034] like Figure 4 As shown, the metal structure 27 of the layer packer 7 has a first through hole 29 and a second through hole 30. The connecting pipe 3 vertically passes through the multiple layer packers 7 through the first through hole 29, and the gas injection pipe 1 vertically passes through the multiple layer packers 7 through the second through hole 30. The lower ends of the gas injection pipe 1 and the connecting pipe 3 can both be closed conical plugs 11.

[0035] like Figure 3 As shown, in practice, since gas in the injection pipe 1 tends to flow upward, the bottom of the injection pipe 1 should be lower than the bottom of the wellpoint pipe 24 during burial. The injection pipe 1 is a series of hollow, end-sealed pipes embedded within an outer tube. They can be arranged at intervals of approximately 1.5-3 meters around the circumference of the construction area. The diameter of the injection pipe 1 is determined by the required air flow rate, and the wall thickness is determined by the required strength to withstand high internal pressures.

[0036] like Figure 3As shown, the outer wall of the stratum packer 7 is in sliding, sealed contact with the inner wall of the borehole, and the connecting pipe control valve 19 is located at the inlet end of the connecting pipe 3. The elastic rubber sealing rings 26 on the outer periphery of each stratum packer 7 are connected in series via the connecting pipe. The connecting pipe control valve 19 controls the connecting pipe 3 to fill the elastic rubber sealing rings 26 on the outer periphery of the stratum packer 7 with water, thereby sealing the borehole wall and expanding and squeezing the inner wall of the borehole. As a result, the multiple stratum packers 7 are used to divide the borehole into multiple gas injection strata distributed along the vertical direction, forming a closed gas injection cavity 6 in each gas injection stratum.

[0037] like Figure 3 As shown, the compressor 15 can be installed on the ground, specifically at the inlet end of the gas injection pipe 1. The gas injection pipe 1 is provided with a gas injection port. The compressor 15 is the source of compressed gas. After the compressed gas 22 generated by the compressor 15 enters the gas injection pipe 1, it is output to the gas injection cavity 6 through these gas injection ports and enters the surrounding soil of the borehole in contact with the gas injection cavity 6, forming an anti-seepage and water-stopping gas curtain wall 23 in the surrounding soil of the borehole. Here, the compressed gas 22 can be compressed air, which is natural, green, environmentally friendly, ubiquitous, and does not require any cost.

[0038] Since an anti-seepage and water-stopping air curtain wall 23 is formed in the soil around the borehole, the higher gas saturation around the gas injection well (i.e., the borehole) can significantly reduce the groundwater seepage capacity within this range; at the same time, due to the high pressure in the gas injection impact zone, it is difficult for the surrounding groundwater to overcome the large pressure gradient and flow into the construction area. Therefore, the air curtain anti-seepage and water-stopping air injection system can establish a long-term air-driven hydraulic barrier around the construction area. Due to the low viscosity and high fluidity of the gas, the air curtain anti-seepage and water-stopping air injection system can achieve an anti-seepage and water-stopping air curtain with a larger closed range. In addition, the closed range of the anti-seepage and water-stopping air curtain also depends on the depth and pressure of the compressed air introduced into the foundation and the permeability of the foundation soil.

[0039] It can be seen that the controllable layered air curtain anti-seepage and water-stopping air injection system provided in the embodiment of the present disclosure can be used to use a layered air injection device to separate the boreholes on the periphery of the construction area into multiple air injection strata in the vertical direction, and form a closed air injection cavity in each air injection stratum; then a compressor is used to generate compressed gas, and the compressed gas is injected into the air injection cavities of multiple air injection strata respectively through an air injection pipe with an air injection port in the layered air injection device to achieve precise layered air injection; after the compressed gas diffuses in the soil and reaches a stable state, a complete anti-seepage and water-stopping air curtain wall is formed around the construction area. The anti-seepage and water-stopping air curtain wall can be used to squeeze the groundwater around the borehole, causing it to flow or seep away from the borehole, thereby preventing groundwater from entering the borehole, achieving layered anti-seepage and water-stopping protection for the construction area, and then preparing for vacuum precipitation, rapid drainage, and layered grouting after drainage. That is to say, the air curtain anti-seepage and water-stopping air injection system can be used to form a circumferentially and vertically distributed multi-layer anti-seepage and water-stopping air curtain wall around the holes drilled on the periphery of the construction area, thereby achieving layered anti-seepage and water-stopping.

[0040] In some embodiments, as Figure 1 and Figure 2 As shown, the above-mentioned layered gas injection device also includes an oil supply pipe 5 that vertically passes through multiple layer packers 7, and a double-acting hydraulic telescopic cylinder 8 that is vertically arranged between two adjacent layer packers 7. The air curtain anti-seepage and water-stopping gas injection system also includes a hydraulic control valve 18 located at the inlet end of the oil supply pipe 5. The oil outlet 12 and the oil inlet 13 of the double-acting hydraulic telescopic cylinder 8 are both connected to the oil supply pipe 5, and are used to adjust the distance between two adjacent layer packers 7 under the control of the hydraulic control valve 18.

[0041] like Figure 4 As shown, the metal structure 27 of the stratum packer 7 has a third through hole 31, and the oil supply pipe 5 can vertically pass through the multiple stratum packers 7 through the third through hole 31. The lower end of the oil supply pipe 5 can be a closed conical plug 11.

[0042] like Figure 1 and Figure 2 As shown, the double-acting hydraulic telescopic cylinder 8 can be fixedly connected to the upper end of the zonal packer 7 by bolts. The oil outlet 12 and the oil inlet 13 are both connected to the oil supply pipe 5, and the oil supply pipe 5 is connected to the hydraulic control valve 18. The hydraulic control valve 18 can be used to control the piston 14 of the double-acting hydraulic telescopic cylinder 8 to move up and down to adjust the position of the zonal packer 7 and thus adjust the distance between two adjacent zonal packers 7.

[0043] When the hydraulic control valve 18 is used to adjust the position of the layer packer 7, the layer packer 7 slides linearly in the vertical direction along the sidewall of the borehole, thereby adjusting the position and size of the gas injection cavity 6. During the adjustment process, the double-acting hydraulic telescopic cylinder 8 moves up and down stably and smoothly, allowing flexible selection of the corresponding gas injection port on the body of the gas injection pipe 1 for operation, achieving stratified gas injection. It can be seen that the stratified gas injection device in the disclosed embodiment is rationally designed and can be used to achieve precise and controllable stratified gas injection.

[0044] The gas injection pipe 1 and the double-acting hydraulic telescopic cylinder 8 are all detachably connected to the stratum packer 7. The stratum packer 7 is in sliding contact with the borehole wall, which facilitates the disassembly and cleaning of the gas injection pipe 1 and reduces the difficulty of cleaning.

[0045] The gas injection pipe 1 , the connecting pipe 3 and the oil supply pipe 5 can all be made of telescopic structural pipes, which are adjusted as the double-acting hydraulic telescopic cylinder 8 is extended or retracted.

[0046] In some embodiments, as Figure 3 As shown, the above-mentioned stratified gas injection device also includes a connecting pipe 28 connected between the gas injection pipe 1 and the compressor 15, and a gas pressure regulating valve 16 and a gas flow meter 17 connected to the connecting pipe 28. The gas pressure regulating valve 16 is used to adjust the pressure of the compressed gas 22 delivered from the compressor 15, and the gas flow meter 17 is used to monitor the flow of the compressed gas 22 delivered from the compressor 15.

[0047] like Figure 3 As shown, one end of a connecting pipe 28 is connected to the outlet of the compressor 15, and the other end is connected to the inlet of the gas injection pipe 1. A gas pressure regulating valve 16 and a gas flow meter 17 are provided on the connecting pipe 28. The compressed gas 22 from the compressor 15 is regulated by the gas pressure regulating valve 16 to a preset pressure value before being delivered to each gas injection pipe 1 via the connecting pipe 28. Here, the gas pressure regulating valve 16 can be used to adjust the pressure of the compressed gas 22 delivered from the compressor 15, and the gas flow meter 17 can be used to monitor the flow rate of the compressed gas 22 delivered from the compressor 15.

[0048] At this time, the compressed gas 22 generated by the compressor 15 can be introduced into the soil through the gas injection pipe 1, and pre-gas injection can be performed under the regulation of the gas pressure regulating valve 16 and the monitoring of the gas flow meter 17 according to the position of the stratum to be reinforced and the expected gas injection pressure.

[0049] When determining the injection pressure (i.e., the pressure of the compressed gas 22 delivered by the compressor 15), the maximum injection pressure must be determined based on the soil properties and the location of the groundwater level during the project, combined with field tests. Generally speaking, the injection pressure during the injection process can be 1.5-3 times the pore water pressure in the soil at the depth. Initially, the pressure should be low, and then gradually increased during the injection process.

[0050] In some embodiments, as Figure 1 As shown, the above-mentioned layered gas injection device also includes a flow sensor 9 provided on the upper part of the side wall of the gas injection pipe 1 in the gas injection cavity 6, which is used to monitor the flow rate of the compressed gas 22 in the gas injection pipe 1 entering each gas injection cavity 6.

[0051] like Figure 1 As shown, a flow sensor 9 is provided on the upper part of the side wall of the gas injection pipe 1 between each two adjacent layer seals 7. It can be seen that since there is a gas injection cavity 6 between each two adjacent layer seals 7, and the flow sensor 9 is located at the entry position of the gas injection pipe 1 in each gas injection cavity 6, the embodiment of the present disclosure can use the flow sensor 9 to monitor the flow of compressed gas 22 in the gas injection pipe 1 entering each gas injection cavity 6.

[0052] In some embodiments, as Figure 3 As shown, the air curtain anti-seepage and water-stopping air injection system 1100 further includes a pressure display gauge 21 and a pressure control valve 20. Figure 1 As shown, the above-mentioned stratified gas injection device further includes a pressure sensor 10 and a gas injection valve 2, which are arranged on the side wall of the gas injection pipe 1 within the gas injection cavity 6, and a cable tube 4 that vertically passes through multiple stratum packers 7. The gas injection valve 2 is electrically connected to the cable in the cable tube 4. The pressure control valve 20 is used to adjust the gas injection volume and pressure of the gas injection valve 2 with the assistance of the pressure sensor 10 and the pressure display gauge 21. Here, the gas injection valve 2 is connected to the gas injection cavity 6.

[0053] like Figure 4 As shown, the metal structure 27 of the stratum packer 7 has a fourth through-hole 32, through which the cable tube 4 can vertically pass through the multiple stratum packers 7. The lower end of the cable tube 4 can be a closed conical plug 11. The cable tube 4 can be a telescopic structure tube, which adjusts with the extension and contraction of the double-acting hydraulic telescopic cylinder 8. The gas injection pipe 1, double-acting hydraulic telescopic cylinder 8, stratum packer 7, and gas injection valve 2 are connected in series.

[0054] like Figure 1 As shown, a pressure sensor 10 is installed on the side wall of the gas injection pipe 1 between each two adjacent layer packers 7. The pressure sensor 10 is electrically connected to a pressure display gauge 21 and can be used to monitor the gas injection pressure of the gas injection pipe 1 in the gas injection cavity of each gas injection formation. The pressure of the gas injection pipe 1 in each gas injection cavity is measured, and then combined with data such as the gas injection volume, the gas injection valve 2 is controlled by the pressure control valve 20 on the ground. The formation where the gas injection cavity 6 connected to the gas injection valve 2 is located is formally injected with different gas injection volumes and pressures, thereby establishing an independent gas injection channel, thereby achieving more precise control of the flow rate of each gas injection layer in the well, and realizing accurate injection and regulation of the gas injection volume in each layer.

[0055] The embodiment of the present disclosure also provides a controllable layered air curtain anti-seepage and water-stopping method, which is applied to the controllable layered air curtain anti-seepage and water-stopping air injection equipment provided in the embodiment of the present disclosure. Figure 5 The flow chart of the controllable layered air curtain anti-seepage and water-stopping method provided by the exemplary embodiment of the present disclosure is shown. Figure 5 As shown, the controllable layered air curtain anti-seepage and water-stopping method includes:

[0056] S501, arranging a circle of drill holes along the periphery of the construction area at a preset distance;

[0057] S502: vertically press the stratified gas injection device into the borehole, and use the connecting pipe control valve to control the connecting pipe to fill the borehole wall with water, forming a closed gas injection cavity in the borehole through two adjacent stratum packers;

[0058] S503, delivering compressed gas generated by the compressor from the gas injection pipe to each gas injection cavity through the gas injection port of the gas injection pipe, and then into the soil surrounding the drilled hole in contact with each gas injection cavity, thereby forming an anti-seepage and water-stopping gas curtain wall;

[0059] S504: Use the vacuum dewatering system to drain the groundwater outside the anti-seepage and water-stopping air curtain wall.

[0060] Specifically, the above-mentioned drill holes can be arranged in advance in a circle of foundation pits along the periphery of the construction area. The foundation pits can be arranged according to preset distances, and the preset distances can be determined according to actual needs. The embodiments of the present disclosure do not specifically limit this.

[0061] The stratified gas injection device is vertically pressed into the borehole. The outer wall of the stratum packer is in sliding, sealed contact with the inner wall of the borehole. The connecting pipe control valve is located at the inlet end of the connecting pipe. The elastic rubber sealing rings around each stratum packer are connected in series via the connecting pipe. The connecting pipe control valve controls the connecting pipe to fill the elastic rubber sealing rings around the stratum packer with water, sealing the borehole wall. The expansion and compression of the borehole inner wall are then applied. The multiple stratum packers thus divide the borehole into multiple gas injection strata distributed vertically, forming a closed gas injection cavity in each gas injection stratum.

[0062] The gas injection pipe is equipped with injection ports. A compressor is the source of compressed gas. After the compressed gas is generated by the compressor, it enters the pipe and is output through these ports to the gas injection cavity. It then enters the soil surrounding the borehole in contact with the gas injection cavity, forming an anti-seepage and water-stopping gas curtain wall within the soil surrounding the borehole. The compressed gas can be compressed air, which is natural, green, ubiquitous, and cost-effective.

[0063] The vacuum dewatering system, located outside the anti-seepage and water-stopping air curtain wall, is used to drain groundwater outside the wall. The vacuum dewatering system can include a vacuum pump, well-point pipes, and a filter head. The filter head, located at the lower end of the well-point pipe, removes large impurities from the groundwater, preventing them from entering the well point and pumping system, potentially causing blockage or damage. The vacuum pump then filters the groundwater through the filter head and into the well-point pipe, where it is then pumped out for rapid drainage.

[0064] It can be seen that the controllable layered air curtain anti-seepage and water-stopping gas injection method provided by the embodiment of the present disclosure can use the layered gas injection device to separate the boreholes on the periphery of the construction area into multiple gas injection strata in the vertical direction, and form a closed gas injection cavity in each gas injection stratum; then use the compressor to generate compressed gas, and inject the compressed gas into the gas injection cavities of multiple gas injection strata respectively through the gas injection pipe with the gas injection port in the layered gas injection device, so as to realize precise layered gas injection; after the compressed gas diffuses in the soil and reaches a stable state, a complete anti-seepage and water-stopping air curtain wall is formed around the construction area. The anti-seepage and water-stopping air curtain wall can be used to squeeze the groundwater around the borehole, so that it flows or seeps away from the borehole, thereby preventing groundwater from entering the borehole and realizing layered anti-seepage and water-stopping protection of the construction area; then, a vacuum dewatering system is used to perform vacuum dewatering and realize rapid drainage, which can improve the effect of layered grouting after drainage. Based on this, the controllable layered air curtain anti-seepage and water-stopping air injection method provided in the embodiment of the present disclosure has the characteristics of simple construction process, low cost, precision and high construction efficiency, high safety and economy, and green environmental protection.

[0065] In some embodiments, the controllable layered air curtain anti-seepage and water-stopping method may further include:

[0066] The double-acting hydraulic telescopic cylinder is controlled by a hydraulic control valve to adjust the distance between two adjacent layer packers.

[0067] Here, you can refer to the related content of the controllable layered air curtain anti-seepage and water-stopping system mentioned above. The hydraulic control valve can be used to control the piston of the double-acting hydraulic telescopic cylinder to move up and down to adjust the position of the stratum packer and thus adjust the distance between two adjacent stratum packers.

[0068] When the hydraulic control valve is used to adjust the position of the layer packer, the layer packer slides vertically along the sidewall of the borehole, thereby adjusting the position and size of the gas injection cavity. During this adjustment process, the double-acting hydraulic telescopic cylinder moves up and down stably and smoothly, allowing flexible selection of the corresponding gas injection port on the gas injection pipe body for operation, achieving stratified gas injection. This shows that the stratified gas injection device in the disclosed embodiment is rationally designed and can be used to achieve precise and controllable stratified gas injection.

[0069] In some embodiments, the controllable layered air curtain anti-seepage and water-stopping method may further include:

[0070] The gas pressure regulating valve connected to the connecting pipe is used to adjust the pressure of the compressed gas delivered from the compressor;

[0071] The flow rate of the compressed gas delivered from the compressor is monitored by a gas flow meter connected to the connecting pipe.

[0072] For more information, please refer to the controllable layered air curtain anti-seepage and water-stopping system mentioned above. The compressed gas from the compressor is regulated by a gas pressure regulating valve to a preset pressure before being delivered to the various gas injection pipes via a connecting pipe. The gas pressure regulating valve regulates the pressure of the compressed gas delivered from the compressor, and the gas flow meter monitors the flow rate of the compressed gas delivered from the compressor.

[0073] In some embodiments, the controllable layered air curtain anti-seepage and water-stopping method may further include:

[0074] The flow rate of the compressed gas in the gas injection pipe entering each gas injection cavity is monitored by using a flow sensor arranged on the upper part of the side wall of the gas injection pipe in the gas injection cavity.

[0075] Here, reference may be made to the relevant content of the controllable layered air curtain anti-seepage and water-stopping system in the previous article. A flow sensor is provided on the upper side wall of the gas injection pipe between each two adjacent layer packers 7. It can be seen that since there is a gas injection cavity between each two adjacent layer packers, and the flow sensor is located at the entry position of the gas injection pipe in each gas injection cavity, the embodiment of the present disclosure can use the flow sensor to monitor the flow rate of compressed gas in the gas injection pipe entering each gas injection cavity.

[0076] In some embodiments, the controllable layered air curtain anti-seepage and water-stopping method may further include:

[0077] With the assistance of the pressure display gauge and the pressure sensors in each gas injection cavity, the pressure control valve is used to adjust the gas injection volume and gas injection pressure of the gas injection valve in each gas injection cavity.

[0078] Here, you can refer to the relevant content of the controllable layered air curtain anti-seepage and water-stopping system in the previous article. A pressure sensor is installed on the side wall of the gas injection pipe between each two adjacent layer packers. The pressure sensor and the pressure display are electrically connected and can be used to monitor the gas injection pressure of the gas injection pipe in the gas injection cavity in each gas injection formation. The pressure of the gas injection pipe in each gas injection cavity is measured, and then combined with the data such as the gas injection volume, the gas injection valve is controlled by the pressure control valve on the ground, and the formation where the gas injection cavity connected to the gas injection valve is located is formally injected with different gas injection volumes and pressures to establish an independent gas injection channel, thereby realizing the control of the flow rate of each gas injection layer underground, and the control is more precise, realizing the precise injection and adjustment of the gas injection volume of each layer.

[0079] The above descriptions are merely some embodiments of the present disclosure and an illustration of the technical principles employed. Those skilled in the art should understand that the scope of disclosure involved in the present disclosure is not limited to the technical solutions formed by a specific combination of the above-mentioned technical features, but also encompasses other technical solutions formed by any combination of the above-mentioned technical features or their equivalents without departing from the above-mentioned disclosed concepts. For example, a technical solution formed by replacing the above-mentioned features with (but not limited to) technical features with similar functions disclosed in the present disclosure.

[0080] Although some specific embodiments of the present disclosure have been described in detail by way of examples, those skilled in the art will appreciate that the above examples are for illustrative purposes only and are not intended to limit the scope of the present disclosure. Those skilled in the art will appreciate that modifications may be made to the above embodiments without departing from the scope and spirit of the present disclosure. The scope of the present disclosure is defined by the appended claims.

Claims

1. A controllable layered air curtain anti-seepage and water-stopping air injection system, characterized in that: The system comprises a compressor, a connecting pipe control valve, and a stratified gas injection device arranged in a borehole outside a construction area. The stratified gas injection device comprises a plurality of horizontally arranged layer packers, and a connecting pipe and a gas injection pipe vertically passing through the plurality of layer packers. The periphery of each layer packer is provided with an elastic rubber sealing ring. The connecting pipe control valve is located at the inlet end of the connecting pipe. The connecting pipe control valve is used to control the connecting pipe to fill the borehole wall with water, thereby forming a closed gas injection cavity in the borehole through two adjacent layer packers. The compressor is located at the inlet end of the air injection pipe, and an air injection port is provided on the pipe body of the air injection pipe. The compressed gas generated by the compressor is transported from the air injection pipe to the air injection cavity through the air injection port, and enters into the surrounding soil of the drilled hole in contact with the air injection cavity, forming an anti-seepage and water-stopping air curtain wall.

2. The controllable layered air curtain anti-seepage and water-stopping air injection system according to claim 1, characterized in that: The layered gas injection device also includes an oil supply pipe that vertically passes through the multiple layer seals, and a double-acting hydraulic telescopic cylinder that is vertically arranged between two adjacent layer seals. The air curtain anti-seepage and water-stopping gas injection system also includes a hydraulic control valve located at the inlet end of the oil supply pipe. The oil outlet and oil inlet of the double-acting hydraulic telescopic cylinder are both connected to the oil supply pipe, and are used to adjust the distance between two adjacent layer seals under the control of the hydraulic control valve.

3. The controllable layered air curtain anti-seepage and water-stopping air injection system according to claim 1, characterized in that: The stratified gas injection device also includes a connecting pipe connected between the gas injection pipe and the compressor, and a gas pressure regulating valve and a gas flow meter connected to the connecting pipe. The gas pressure regulating valve is used to adjust the pressure of the compressed gas delivered from the compressor, and the gas flow meter is used to monitor the flow rate of the compressed gas delivered from the compressor.

4. The controllable layered air curtain anti-seepage and water-stopping air injection system according to claim 1, characterized in that: The layered gas injection device further includes a flow sensor provided on the upper portion of the side wall of the gas injection pipe in the gas injection cavity, for monitoring the flow of the compressed gas in the gas injection pipe entering each of the gas injection cavities.

5. The controllable layered air curtain anti-seepage and water-stopping air injection system according to any one of claims 1 to 4, characterized in that: The air curtain anti-seepage and water-stopping gas injection system also includes a pressure display gauge and a pressure control valve. The layered gas injection device also includes a pressure sensor and an injection valve arranged on the side wall of the gas injection pipe in the gas injection cavity, and a cable pipe vertically passing through the multiple layers of sealers. The gas injection valve is electrically connected to the cable in the cable pipe. The pressure control valve is used to adjust the gas injection volume and injection pressure of the gas injection valve with the assistance of the pressure sensor and the pressure display gauge.

6. A controllable layered air curtain anti-seepage and water-stopping air injection device, characterized in that: It comprises a controllable layered air curtain anti-seepage and water-stopping air injection system and a vacuum dewatering system as described in any one of claims 1 to 5, wherein the air curtain anti-seepage and water-stopping air injection system is used to form an anti-seepage and water-stopping air curtain wall on the periphery of the construction area, and the vacuum dewatering system is located on the outside of the anti-seepage and water-stopping air curtain wall and is used to discharge groundwater outside the anti-seepage and water-stopping air curtain wall.

7. A controllable layered air curtain anti-seepage and water-stopping method, applied to the controllable layered air curtain anti-seepage and water-stopping gas injection equipment according to claim 6, characterized in that: The method comprises: Drill holes in a circle at preset distances along the perimeter of the construction area; The stratified gas injection device is vertically pressed into the borehole, and the connecting pipe control valve is used to control the connecting pipe to fill the borehole wall with water, so as to form a closed gas injection cavity in the borehole through two adjacent stratum packers; The compressed gas generated by the compressor is transported from the gas injection pipe to each of the gas injection cavities through the gas injection port of the gas injection pipe, and enters into the surrounding soil of the drilled holes in contact with each of the gas injection cavities to form an anti-seepage and water-stopping gas curtain wall; The groundwater outside the anti-seepage and water-stopping air curtain wall is discharged using a vacuum dewatering system.

8. The controllable layered air curtain anti-seepage and water-stopping method according to claim 7, characterized in that: The method further comprises: The double-acting hydraulic telescopic cylinder is controlled by a hydraulic control valve to adjust the distance between two adjacent layer packers.

9. The controllable layered air curtain anti-seepage and water-stopping method according to claim 8, characterized in that: The method further comprises: Utilizing a gas pressure regulating valve connected to the connecting pipe to regulate the pressure of the compressed gas delivered from the compressor; Using a gas flow meter connected to the connecting pipe to monitor the flow rate of the compressed gas delivered from the compressor; and / or, The flow rate of the compressed gas in the gas injection pipe entering each gas injection cavity is monitored by using a flow sensor provided on the upper portion of the side wall of the gas injection pipe in the gas injection cavity.

10. The controllable layered air curtain anti-seepage and water-stopping method according to any one of claims 7 to 9, characterized in that: The method further comprises: With the assistance of a pressure display gauge and a pressure sensor in each of the gas injection cavities, a pressure control valve is used to adjust the gas injection volume and gas injection pressure of the gas injection valve in each of the gas injection cavities.

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