A method for drilling and grouting toe plate curtain of a hydropower station

Abstract

The present application belongs to toe plate curtain drilling and grouting construction technical field, especially to a kind of toe plate curtain drilling and grouting construction method of hydropower station, comprising the following steps: S1, determine hole position, first determine grouting hole position in toe plate of hydropower station.The toe plate curtain drilling and grouting construction method of hydropower station has reduced the temperature difference between cement slurry and slurry grouting position environment, thereby reducing the temperature difference stress of cement slurry, avoid the structure of cement slurry cracking and damage as far as possible, and can improve the fluidity and hydration uniformity of cement slurry, and the toe plate curtain drilling and grouting construction method of hydropower station also has the function of cement slurry pre-vibration and grouting pressure deficiency prompting, not only can improve the reliability of toe plate curtain drilling and grouting construction of hydropower station, but also can improve the quality of toe plate curtain construction of hydropower station, and can reduce the time of cement slurry vibration after grouting, thereby can improve the convenience and efficiency of toe plate curtain drilling and grouting construction of hydropower station.

Description

Technical Field

[0001] This invention belongs to the field of toe slab curtain drilling and grouting construction technology, and in particular relates to a method for toe slab curtain drilling and grouting construction in hydropower stations. Background Technology

[0002] Toe slab curtain is a special cement grouting technology used in the construction of hydropower stations. During the construction of a hydropower station, the toe slab of the dam or hydropower station plays an important role in supporting and sealing. Through toe slab curtain technology, a uniform and dense cement grout layer can be efficiently formed on the surface of the toe slab. This cement layer can provide sufficient support and waterproofing, and can also adapt to the shape and requirements of the toe slab, thereby improving the stability and durability of the toe slab.

[0003] In the current toe slab curtain drilling and grouting construction process of hydropower stations, multiple grouting holes are first drilled on the toe slab, extending to the riverbed rock layer. Cement grout is then injected into these holes to form the toe slab curtain. However, during the actual grouting process, the bottom of the grouting holes is located underground. As the depth of the grouting holes increases, the temperature difference between the bottom of the grouting holes and the ground surface gradually widens. This results in a significant temperature difference between the cement grout transported from the ground and the environment at the bottom of the grouting holes. Furthermore, the rock at the bottom of the grouting holes has a slow heat dissipation rate, leading to insufficient heat dissipation within the cement grout during solidification. The accumulation of heat further exacerbates the temperature difference between the cement grout and the environment at the bottom of the grouting holes. The temperature difference between the bottom environment and the surrounding environment can lead to increased temperature stress in the cement grout, thereby increasing the risk of cracking and damage. It also affects the fluidity of the cement grout, preventing it from reliably penetrating into the gaps at the bottom of the grouting hole, and impacting the uniformity of hydration. These factors not only reduce the reliability of the toe slab curtain drilling and grouting construction in hydropower stations but also negatively affect the construction quality of the toe slab curtain. Furthermore, the existing process for drilling and grouting the toe slab curtain in hydropower stations involves pouring first and then vibrating, and ensuring effective vibration is time-consuming, further affecting the convenience and efficiency of the drilling and grouting construction.

[0004] Therefore, we propose a method for constructing a curtain grouting system for the toe slab of a hydropower station to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to address the above-mentioned problems by providing a method for drilling and grouting construction of the toe slab curtain in hydropower stations.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a method for drilling and grouting construction of a toe slab in a hydropower station, comprising the following steps:

[0007] S1. Determine the hole location. First, determine the location of the grouting hole on the toe plate of the hydropower station and mark the hole location with a drawing tool. The grouting holes are arranged in a double row in a quincunx pattern, and the spacing between adjacent grouting holes is in the range of 1m-3m.

[0008] S2. Drilling: Using drilling equipment, drill grouting holes at the determined grouting hole locations. The drill bit first penetrates the hydropower station toe plate with a thickness of 1-1.2 meters, and then the drill bit enters the rock layer to a depth of 80m-8.5m.

[0009] S3. Clean the grouting hole. After drilling the grouting hole, clean the inside of the grouting hole of the gravel and debris to ensure that the wall of the grouting hole is clean and flat.

[0010] S4. Grouting: Install grouting machinery at the cleaned grouting hole, with the top of the grouting machinery connected to the output end of the grouting device, and the top of the grouting machinery also connected to the crane. Then, use the grouting device to inject the mixed cement slurry into the grouting hole, ensuring that the slurry fills the contact surface between the grouting hole and the rock, thereby forming the toe slab curtain of the hydropower station.

[0011] S5. Vibration: After grouting is completed, use a vibrating device for simple vibration to achieve uniform distribution of cement slurry in the grouting hole.

[0012] S6. Monitoring and Acceptance: After grouting is completed, quality monitoring is carried out on the toe slab curtain area of ​​the hydropower station to check the grouting quality and carry out relevant acceptance work to confirm that the drilling and grouting project of the toe slab curtain of the hydropower station meets the design requirements and relevant specifications.

[0013] The grouting machinery includes a hollow grouting pipe. A pipe joint is fixedly connected to the top end of the hollow grouting pipe. Multiple lifting rings for crane lifting are fixedly connected to the top end of the pipe joint. A sealing rubber ring is movably sleeved on the wall of the hollow grouting pipe. A sealing grounding ring is fixedly sleeved on the outer wall of the sealing rubber ring. An insufficient grouting pressure reminder mechanism and a vibration auxiliary mechanism are fixedly connected to the upper surface of the sealing grounding ring. A starting mechanism for the operation of the vibration auxiliary mechanism is fixedly sleeved on the bottom wall of the hollow grouting pipe. A cement slurry temperature control mechanism is fixedly connected to the top end of the vibration auxiliary mechanism.

[0014] In the above-mentioned method for drilling and grouting toe slab curtain walls in a hydropower station, the vibration auxiliary mechanism includes a motor fixedly connected to the upper surface of the sealing grounding ring. The output end of the motor is fixedly connected to a rotating shaft. The side end of the rotating shaft is fixedly connected to a reciprocating lead screw via a coupling. An electromagnetic brake is sleeved on the outer wall of the rotating shaft. A connecting plate is sleeved on the fixed end of the electromagnetic brake. A lead screw nut is threaded onto the rod wall of the reciprocating lead screw. A U-shaped frame is fixedly sleeved on the outer wall of the lead screw nut. A vibrating ring is movably sleeved on the wall of the hollow grouting pipe. The outer wall of the vibrating ring is fixedly connected to the side end of the U-shaped frame.

[0015] In the above-mentioned method for drilling and grouting a toe slab curtain in a hydropower station, the starting mechanism includes an insulating ring fixedly sleeved on the outer wall of the bottom end of a hollow grouting pipe. Two conductive rods are fixedly embedded on the outer wall of the insulating ring. Two through holes are opened on the outer wall of the insulating ring, and T-shaped insulating rods are movably connected to the hole walls of the through holes. A conductive metal ring and a hollow floating ring are movably sleeved on the outer wall of the hollow grouting pipe. The upper surface of the conductive metal ring is fixedly connected to the bottom end of the T-shaped insulating rod, and the bottom end of the conductive metal ring is fixedly connected to the upper surface of the hollow floating ring.

[0016] In the above-mentioned method for drilling and grouting a toe slab curtain wall in a hydropower station, the cement slurry temperature control mechanism includes a hollow box fixedly connected to the outer wall of a motor. The top of the connecting plate is fixedly connected to the upper surface of the hollow box. A guide volute is sleeved on the output end rod wall of the motor through two sealed bearings. A guide fan blade is fixedly sleeved on the output end rod wall of the motor. The guide fan blade is located inside the guide volute. The output end of the guide volute passes through the inner wall of the hollow box. A hollow strip is fixedly connected to the output end of the guide volute. A hollow strip is fixedly embedded on the outer wall of the top of the hollow strip. Multiple vortex tubes are provided, with their cold air ends all fixedly fitted with a heat insulation plate. The outer wall of the heat insulation plate is fixedly connected to the inner wall of the hollow box. The hot air ends of the multiple vortex tubes pass through the outer wall of the hollow box. A flexible hose is fixedly connected to the top outer wall of the hollow box. The output end of the flexible hose is fixedly connected to the cavity of the hollow grouting pipe. Multiple one-way air valves are fixedly embedded at the bottom end of the cavity of the hollow grouting pipe. A temperature regulating module is fixedly connected to the outer wall of the insulating ring, and the wires of the temperature regulating module pass through the cavity of the hollow grouting pipe and are electrically connected to the motor circuit.

[0017] In the above-mentioned method for drilling and grouting the toe slab curtain of a hydropower station, the outer walls of both sides of the hollow floating ring are fixedly connected with arc-shaped buffer airbags, and the outer walls of the two arc-shaped buffer airbags are connected to an arc-shaped conduit.

[0018] In the above-mentioned method for drilling and grouting the toe slab curtain of a hydropower station, the insufficient grouting pressure reminder mechanism includes a connecting cover and a support pipe fixedly connected to the upper surface of the sealing grounding ring. An indicator light is fixedly connected to the top of the support pipe. The sealing grounding ring has a fixing hole on its upper surface at the top of the grouting hole, and an air inlet one-way valve is fixedly connected to the wall of the fixing hole. The output end of the air inlet one-way valve is located inside the connecting cover. A pressure valve is fixedly connected to the top of the connecting cover, and a touch switch is fixedly connected to the inner wall of the connecting cover.

[0019] In the above-mentioned method for drilling and grouting the toe slab curtain of a hydropower station, multiple fine-mesh filter screens are fixedly connected to the walls of the multiple air inlets of the air guide volute, and the thickness of the fine-mesh filter screens is 0.3-0.4 mm.

[0020] In the above-mentioned method for drilling and grouting construction of a toe slab curtain in a hydropower station, the toe slab curtain extends along the toe slab of the hydropower station towards the mountains on both banks, and connects with the seepage prevention curtains of the mountains on the left and right banks respectively after reaching the left and right bank shoulders.

[0021] Compared with existing technologies, the advantages of a new method for drilling and grouting construction of the toe slab of a hydropower station are:

[0022] 1. Through the cement grout temperature control mechanism, when the drilling of the grouting holes for the toe slab curtain of the hydropower station is completed and grouting is required, the temperature control module connected to the bottom of the hollow grouting pipe is first affected by the low temperature environment at the bottom of the grouting hole. The positive coefficient thermistor inside the temperature control module reduces the resistance, enabling the motor in the same circuit of the temperature control module to have greater output power, and driving the guide fan blades to draw more air into the vortex tube. Then, some of the air is processed through the vortex tube and discharged from the cold air end of the vortex tube. The temperature of the discharged air is 5-8 degrees Celsius lower than the ambient temperature at the location of the temperature control module. After that, the cold air is passed through... The cement grout is delivered through a flexible hose to the cavity of the hollow grouting pipe to cool it down, thereby reducing the temperature difference between the cement grout and the grouting location. The lower temperature also allows the cement grout to dissipate heat from solidification more effectively, preventing large temperature stress and improving its fluidity and hydration uniformity. This mechanism enables the toe slab curtain drilling and grouting construction method in hydropower stations to reduce the temperature difference between the cement grout and the grouting location environment, thus reducing the temperature stress of the cement grout. This not only improves the reliability of toe slab curtain drilling and grouting construction in hydropower stations but also enhances the quality of the toe slab curtain construction.

[0023] 2. Through the set starting mechanism and vibration auxiliary mechanism, when the toe slab curtain drilling and grouting construction of the hydropower station is carried out, the hollow floating ring and conductive metal ring are pushed up as the cement slurry accumulates, so that the conductive metal ring connects to two conductive rods. After the conductive rods are connected, the electromagnetic brake is energized and loses electromagnetic braking. The motor output end drives the hollow grouting pipe to vibrate frequently through the reciprocating screw, screw nut and U-shaped frame. The hollow grouting pipe submerged in the cement slurry can realize the pre-vibration of cement slurry, reducing the time for formal vibration of cement slurry after grouting. This mechanism enables the hydropower station toe slab curtain drilling and grouting construction method to have the function of cement slurry pre-vibration, thereby reducing the time for cement slurry vibration after grouting, and thus improving the convenience and efficiency of hydropower station toe slab curtain drilling and grouting construction.

[0024] 3. The insufficient grouting pressure reminder mechanism ensures that when insufficient grouting pressure occurs during the grouting process, resulting in inadequate cement grout flow, the internal air pressure of the grouting hole decreases. This reduces the amount of air entering the connecting cover through the one-way valve, causing insufficient pressure on the contact switch within the connecting cover, thus extinguishing the indicator light and alerting workers at the construction site to the insufficient grouting pressure. This allows workers to promptly adjust the grouting pressure in the grouting hole, preventing unreliable grouting of the toe slab curtain in hydropower stations. This mechanism provides an insufficient grouting pressure reminder function for the toe slab curtain drilling and grouting construction method in hydropower stations, thereby ensuring the quality of the toe slab curtain grouting construction. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the grouting machinery in a hydropower station toe slab curtain drilling and grouting construction method provided by the present invention;

[0026] Figure 2 yes Figure 1 Schematic diagram of the intermediate vibration auxiliary mechanism, cement slurry temperature control mechanism, and insufficient grouting pressure reminder mechanism;

[0027] Figure 3 yes Figure 2 A partially enlarged structural diagram;

[0028] Figure 4 yes Figure 1 A schematic diagram of the starting mechanism.

[0029] The diagram shows: 1 Grouting machinery, 2 Hollow grouting pipe, 3 Pipe joint, 4 Lifting ring, 5 Fine mesh filter screen, 6 Insufficient grouting pressure reminder mechanism, 61 Connecting cover, 62 Support pipe, 63 Indicator light, 64 Air inlet check valve, 65 Pressure valve, 66 Touch switch, 7 Vibration auxiliary mechanism, 71 Motor, 72 Rotary shaft, 73 Reciprocating screw, 74 Electromagnetic brake, 75 Connecting plate, 76 Screw nut, 77 U-shaped frame, 78 Vibration ring, 8 Starting mechanism, 81 Insulating ring, 82 Conductive rod, 83 T-shaped insulating rod, 84 Conductive metal ring, 85 Hollow floating ring, 9 Cement slurry temperature control mechanism, 91 Hollow box, 92 Air guide volute, 93 Air guide fan blade, 94 Hollow strip, 95 Vortex tube, 96 Heat insulation board, 97 Hose, 98 Air check valve, 99 Temperature adjustment module, 10 Sealing grounding ring, 11 Sealing rubber ring, 12 Arc-shaped buffer airbag, 13 Arc-shaped conduit. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] like Figures 1-4 As shown, a method for drilling and grouting construction of a toe slab in a hydropower station includes the following steps:

[0032] S1. Determine the hole location. First, determine the location of the grouting hole on the toe plate of the hydropower station and mark the hole location with a drawing tool. The grouting holes are arranged in a double row in a quincunx pattern, and the distance between adjacent grouting holes is 2 meters.

[0033] S2. Drilling: Drill grouting holes at the determined grouting hole locations using drilling equipment. The drill bit first penetrates the 1-meter-thick toe plate of the hydropower station, and then the drill bit enters the rock layer to a depth of 80m.

[0034] S3. Clean the grouting hole. After drilling the grouting hole, clean the inside of the grouting hole of the gravel and debris to ensure that the wall of the grouting hole is clean and flat.

[0035] S4. Grouting: Install grouting machine 1 at the cleaned grouting hole, with the top of grouting machine 1 connected to the output end of the grouting device, and the top of grouting machine 1 also connected to the crane. Then, use the grouting device to inject the mixed cement grout into the grouting hole, ensuring that the grout fills the contact surface between the grouting hole and the rock, thereby forming the toe slab curtain of the hydropower station. The toe slab curtain of the hydropower station extends along the toe slab of the hydropower station to the mountains on both banks, and connects with the seepage prevention curtain of the mountains on the left and right banks respectively after reaching the left and right bank dam shoulders.

[0036] S5. Vibration: After grouting is completed, use a vibrating device for simple vibration to achieve uniform distribution of cement slurry in the grouting hole.

[0037] S6. Monitoring and Acceptance: After grouting is completed, quality monitoring is carried out on the toe slab curtain area of ​​the hydropower station to check the grouting quality and carry out relevant acceptance work to confirm that the drilling and grouting project of the toe slab curtain of the hydropower station meets the design requirements and relevant specifications.

[0038] The grouting machine 1 includes a hollow grouting pipe 2. A pipe joint 3 is fixedly connected to the top of the hollow grouting pipe 2. Multiple lifting rings 4 for crane lifting are fixedly connected to the top of the pipe joint 3. A sealing rubber ring 11 is movably sleeved on the wall of the hollow grouting pipe 2. A sealing grounding ring 10 is fixedly sleeved on the outer wall of the sealing rubber ring 11. A grouting pressure insufficient reminder mechanism 6 is fixedly connected to the upper surface of the sealing grounding ring 10. The grouting pressure insufficient reminder mechanism 6 includes a connecting cover 61 and a support pipe 62 fixedly connected to the upper surface of the sealing grounding ring 10. A warning light 63 is fixedly connected to the top of the pipe 62. The sealing grounding ring 10 is located at the top of the grouting hole and has a fixed hole on its upper surface. An air inlet check valve 64 is fixedly connected to the wall of the fixed hole. The output end of the air inlet check valve 64 is located inside the connecting cover 61. A pressure valve 65 is fixedly connected to the top of the connecting cover 61. A touch switch 66 is fixedly connected to the inner wall of the connecting cover 61. This mechanism enables the hydropower station toe slab curtain drilling and grouting construction method to have a grouting pressure insufficient reminder function, thereby ensuring the quality of hydropower station toe slab curtain grouting construction.

[0039] A vibration auxiliary mechanism 7 is fixedly connected to the upper surface of the sealing grounding ring 10. The vibration auxiliary mechanism 7 includes a motor 71 fixedly connected to the upper surface of the sealing grounding ring 10. A rotating shaft 72 is fixedly connected to the output end of the motor 71. A reciprocating screw 73 is fixedly connected to the side end of the rotating shaft 72 through a coupling. An electromagnetic brake 74 is sleeved on the outer wall of the rotating shaft 72. A connecting plate 75 is sleeved on the fixed end of the electromagnetic brake 74. A screw nut 76 is threaded onto the rod wall of the reciprocating screw 73. A U-shaped frame 77 is fixedly sleeved on the outer wall of the screw nut 76. A vibration ring 78 is movably sleeved on the wall of the hollow grouting pipe 2. The outer wall of the vibration ring 78 is fixedly connected to the side end of the U-shaped frame 77. The electromagnetic brake 74 is a de-energized electromagnetic brake. This mechanism enables the toe slab curtain drilling and grouting construction method of hydropower stations to have the function of cement slurry pre-vibration, thereby reducing the cement slurry vibration time after grouting. This not only improves the convenience and efficiency of the toe slab curtain drilling and grouting construction of hydropower stations, but also reduces the labor intensity of workers.

[0040] The bottom wall of the hollow grouting pipe 2 is fixedly sleeved with a starting mechanism 8 for the operation of the vibration auxiliary mechanism 7. The starting mechanism 8 includes an insulating ring 81 fixedly sleeved with the outer wall of the bottom end of the hollow grouting pipe 2. Two conductive rods 82 are fixedly embedded in the outer wall of the insulating ring 81. Two through holes are opened on the outer wall of the insulating ring 81, and T-shaped insulating rods 83 are movably connected to the hole walls. A conductive metal ring 84 and a hollow floating ring 85 are movably sleeved on the outer wall of the hollow grouting pipe 2. The upper surface of the conductive metal ring 84 is fixedly connected to the bottom end of the T-shaped insulating rod 83, and the bottom end of the conductive metal ring 84 is fixedly connected to the upper surface of the hollow floating ring 85. Arc-shaped buffer airbags 12 are fixedly connected to both outer walls of the hollow floating ring 85. The outer walls of the two arc-shaped buffer airbags 12 are connected to an arc-shaped conduit 13. The arc-shaped buffer airbags 12 and the arc-shaped conduit 13 work together to minimize the collision between the bottom end of the hollow grouting pipe 2 and the inner wall of the grouting hole, ensuring the safety of the hollow grouting pipe 2.

[0041] The top of the vibration auxiliary mechanism 7 is fixedly connected to a cement slurry temperature control mechanism 9. The cement slurry temperature control mechanism 9 includes a hollow box 91 fixedly connected to the outer wall of the motor 71. The top of the connecting plate 75 is fixedly connected to the upper surface of the hollow box 91. The output end rod wall of the motor 71 is sleeved with an air guide volute 92 through two sealed bearings. Multiple fine-mesh filter sheets 5 are fixedly connected to the walls of multiple air inlets of the air guide volute 92. The thickness of the fine-mesh filter sheets 5 is 0.35 mm. The thinner fine-mesh filter sheets 5 can facilitate air permeability. The output end rod wall of the motor 71 is fixedly sleeved with a guide fan blade 93. The guide fan blade 93 is located inside the air guide volute 92. The output end of the air guide volute 92 passes through the inner wall of the hollow box 91. The output end of the air guide volute 92 is fixedly connected to a hollow strip 94. Multiple vortex tubes 95 are fixedly embedded on the top outer wall of the hollow strip 94. The cold air ends of the multiple vortex tubes 95 are jointly fixedly sleeved with a heat insulation plate 96. The outer wall of the heat insulation plate 96 is fixedly connected to the inner wall of the hollow box 91. The hot air ends of multiple vortex tubes 95 pass through the outer wall of the hollow box 91. A flexible hose 97 is fixedly connected to the top outer wall of the hollow box 91. The output end of the flexible hose 97 is fixedly connected to the cavity of the hollow grouting pipe 2. Multiple one-way air valves 98 are fixedly embedded at the bottom end of the cavity of the hollow grouting pipe 2. A temperature regulating module 99 is fixedly connected to the outer wall of the insulating ring 81. The wire of the temperature regulating module 99 passes through the cavity of the hollow grouting pipe 2 and is electrically connected to the circuit of the motor 71. This mechanism enables the drilling and grouting construction method of the toe slab curtain of the hydropower station to reduce the temperature difference between the cement grout and the grouting location environment, thereby reducing the temperature difference stress of the cement grout, minimizing the cracking and damage of the cement grout structure, and improving the fluidity and hydration uniformity of the cement grout. This not only improves the reliability of the drilling and grouting construction of the toe slab curtain of the hydropower station, but also improves the quality of the construction of the toe slab curtain of the hydropower station.

[0042] The operating principle of this invention is described as follows: When constructing the grouting holes for the toe slab curtain of a hydropower station, the hole positions are first determined, then holes are drilled using drilling equipment. When grouting is required after drilling, the grouting machine 1 is connected to the grouting equipment via pipe joint 3, and simultaneously suspended from the crane hook via lifting ring 4. Then, the hollow grouting pipe 2 is inserted into the grouting hole, and the sealing grounding ring 10 contacts the toe slab of the hydropower station, sealing the connection. The temperature regulating module 99 connected to the bottom of the hollow grouting pipe 2 is affected by the low-temperature environment at the bottom of the grouting hole. The positive coefficient thermocouple inside the temperature regulating module 99... The reduced resistance of the components allows the motor 71 in the same circuit as the temperature regulation module 99 to have greater output power, driving the guide fan blades 93 to draw more air along the guide volute 92 into the hollow strip 94. This high-speed, high-pressure air then enters the vortex tube 95. A portion of the air is then processed by the vortex tube 95 and discharged from its cold end. The discharged air temperature is 5-8 degrees Celsius lower than the ambient temperature at the location of the temperature regulation module 99, thus addressing the cooling effect of the cold air on the cement grout inside the hollow grouting pipe 2. The cold air is then delivered to the cavity of the hollow grouting pipe 2 through the hose 97. The low temperature carried by the air can cool the cement grout delivered to the hollow grouting pipe 2, matching the temperature of the cement grout delivered from the ground with the temperature at the grouting location. This reduces the temperature difference between the cement grout and the grouting location. Furthermore, the lower temperature allows the cement grout to dissipate heat during solidification more effectively, preventing significant thermal stress and improving its fluidity and hydration uniformity. As the hollow grouting pipe 2 is gradually lifted by the crane, the temperature control module 99 can adjust the speed of the motor 71 in real time according to the temperature at the location. The closer the temperature control module 99 is to the top of the grouting hole... The higher the ambient temperature, the lower the speed of motor 71. By controlling the speed and pressure of the air entering the vortex tube 95, and thus controlling the temperature of the air discharged from the cold air end of the vortex tube 95, this mechanism enables the drilling and grouting method for the toe slab curtain of hydropower stations to reduce the temperature difference between the cement grout and the environment at the grouting location, thereby reducing the temperature difference stress of the cement grout, minimizing cracking and damage to the cement grout structure, and improving the fluidity and hydration uniformity of the cement grout. This not only improves the reliability of drilling and grouting construction for the toe slab curtain of hydropower stations but also enhances the quality of the toe slab curtain construction.

[0043] In addition, during the drilling and grouting construction of the toe slab curtain in the hydropower station, cement grout discharged from the hollow grouting pipe 2 fills the grouting holes. As the cement grout accumulates, it pushes the hollow floating ring 85 and the conductive metal ring 84 upwards. The bottom end of the hollow grouting pipe 2 is submerged in the cement grout, and the conductive metal ring 84 pushes the T-shaped insulating rod 83 to move, connecting the conductive metal ring 84 to two conductive rods 82. After the conductive rods 82 are connected, the electromagnetic brake 74 is energized and loses its electromagnetic braking function. The output end of the motor 71 drives the reciprocating screw 73 to rotate via the rotating shaft 72. The reciprocating screw 73, through the screw nut 76 and the U-shaped frame 77, frequently reciprocates, causing the hollow grouting pipe 2 to vibrate. The hollow grouting pipe 2, submerged in the cement grout, can achieve pre-vibration of the cement grout, reducing the time required for formal vibration of the cement grout after grouting and also reducing the workload of the workers. This mechanism makes the drilling and grouting construction method of the toe slab curtain in the hydropower station more efficient than traditional cement grouting. The pre-vibration function of the grout reduces the vibration time of the cement grout after grouting, which not only improves the convenience and efficiency of drilling and grouting construction of the toe slab curtain in hydropower stations, but also reduces the labor intensity of workers. When insufficient grouting pressure occurs during the grouting process, resulting in insufficient flow of cement grout, the air pressure inside the grouting hole decreases, and no more air enters the connecting cover 61 through the air inlet one-way valve 64. This causes the pressure switch 66 inside the connecting cover 61 to be insufficiently pressurized and not conduct, thereby turning off the indicator light 63 and reminding the workers at the construction site that the grouting pressure is insufficient. This allows the workers to correct the grouting pressure of the grouting hole in time, avoiding unreliable situations in the grouting of the toe slab curtain in hydropower stations. Finally, the monitoring and acceptance process is completed. This mechanism enables the drilling and grouting construction method of the toe slab curtain in hydropower stations to have a grouting pressure insufficient reminder function, thereby ensuring the quality of the grouting construction of the toe slab curtain in hydropower stations.

[0044] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for constructing a curtain grouting system for the toe slab of a hydropower station, characterized in that, Includes the following steps: S1. Determine the hole location. First, determine the location of the grouting hole on the toe plate of the hydropower station and mark the hole location with a drawing tool. The grouting holes are arranged in a double row in a quincunx pattern, and the spacing between adjacent grouting holes is in the range of 1m-3m. S2. Drilling: Drill grouting holes at the determined grouting hole locations using drilling equipment. The drill bit first penetrates the hydropower station toe plate with a thickness of 1-1.2 meters, and then the drill bit enters the rock layer to a depth of 80 meters. S3. Clean the grouting hole. After drilling the grouting hole, clean the inside of the grouting hole of the gravel and debris to ensure that the wall of the grouting hole is clean and flat. S4. Grouting: Install grouting machinery (1) at the cleaned grouting hole, and connect the top of grouting machinery (1) to the output end of grouting device. Also, connect the top of grouting machinery (1) to the crane. Then use grouting device to inject the mixed cement slurry into the grouting hole to ensure that the slurry fills the contact surface between the grouting hole and the rock, thereby forming the toe slab curtain of the hydropower station. S5. Vibration: After grouting is completed, use a vibrating device to vibrate and compact the cement slurry in the grouting hole to achieve uniform distribution of cement slurry. S6. Monitoring and Acceptance: After grouting is completed, quality monitoring is carried out on the toe slab curtain area of ​​the hydropower station to check the grouting quality and carry out relevant acceptance work to confirm that the drilling and grouting project of the toe slab curtain of the hydropower station meets the design requirements and relevant specifications. The grouting machine (1) includes a hollow grouting pipe (2), the top end of which is fixedly connected to a pipe joint (3), the top end of which is fixedly connected to multiple lifting rings (4) for crane lifting, the pipe wall of the hollow grouting pipe (2) is movably sleeved with a sealing rubber ring (11), the outer wall of the sealing rubber ring (11) is fixedly sleeved with a sealing grounding ring (10), the upper surface of the sealing grounding ring (10) is fixedly connected to a grouting pressure insufficient reminder mechanism (6) and a vibration auxiliary mechanism (7), the bottom end of the hollow grouting pipe (2) is fixedly sleeved with a starting mechanism (8) for the operation of the vibration auxiliary mechanism (7), and the top end of the vibration auxiliary mechanism (7) is fixedly connected to a cement slurry temperature control mechanism (9). The vibration auxiliary mechanism (7) includes a motor (71) fixedly connected to the upper surface of the sealing grounding ring (10). The output end of the motor (71) is fixedly connected to a rotating shaft (72). An electromagnetic brake (74) is sleeved on the outer wall of the rotating shaft (72). A connecting plate (75) is sleeved on the fixed end of the electromagnetic brake (74). The starting mechanism (8) includes an insulating ring (81) that is fixedly sleeved on the outer wall of the bottom end of the hollow grouting pipe (2). The cement slurry temperature control mechanism (9) includes a hollow box (91) fixedly connected to the outer wall of a motor (71). The top of the connecting plate (75) is fixedly connected to the upper surface of the hollow box (91). The output end rod wall of the motor (71) is fitted with a guide volute (92) through two sealed bearings. A guide fan blade (93) is fixedly fitted to the output end rod wall of the motor (71). The guide fan blade (93) is located inside the guide volute (92). The output end of the guide volute (92) passes through the inner wall of the hollow box (91). The output end of the guide volute (92) is fixedly connected to a hollow strip (94). A plurality of vortex tubes (95) are fixedly embedded on the outer wall of the top of the hollow strip (94). The cold air ends of the vortex tubes (95) are all fixedly fitted with heat insulation plates (96). The outer wall of the heat insulation plates (96) is fixedly connected to the inner wall of the hollow box (91). The hot air ends of the multiple vortex tubes (95) pass through the outer wall of the hollow box (91). The top outer wall of the hollow box (91) is fixedly connected to a flexible hose (97). The output end of the flexible hose (97) is fixedly connected to the cavity of the hollow grouting pipe (2). The bottom end of the cavity of the hollow grouting pipe (2) is fixedly embedded with multiple one-way air valves (98). The outer wall of the insulating ring (81) is fixedly connected to a temperature regulating module (99). The wires of the temperature regulating module (99) pass through the cavity of the hollow grouting pipe (2) and are electrically connected to the circuit of the motor (71).

2. The method for constructing a curtain grouting system for the toe slab of a hydropower station according to claim 1, characterized in that, The side end of the rotating shaft (72) is fixedly connected to a reciprocating screw (73) via a coupling. The screw nut (76) is threaded onto the wall of the reciprocating screw (73). A U-shaped frame (77) is fixedly fitted onto the outer wall of the screw nut (76). A vibrating ring (78) is movably fitted onto the wall of the hollow grouting pipe (2). The outer wall of the vibrating ring (78) is fixedly connected to the side end of the U-shaped frame (77).

3. The method for constructing a curtain grouting system for the toe slab of a hydropower station according to claim 2, characterized in that, Two conductive rods (82) are fixedly embedded in the outer wall of the insulating ring (81). Two through holes are opened in the outer wall of the insulating ring (81), and T-shaped insulating rods (83) are movably connected to the hole walls of the through holes. A conductive metal ring (84) and a hollow floating ring (85) are movably sleeved on the outer wall of the hollow grouting pipe (2). The upper surface of the conductive metal ring (84) is fixedly connected to the bottom end of the T-shaped insulating rod (83), and the bottom end of the conductive metal ring (84) is fixedly connected to the upper surface of the hollow floating ring (85).

4. The method for constructing a curtain grouting system for a hydropower station toe slab according to claim 3, characterized in that, Both sides of the hollow floating ring (85) are fixedly connected to arc-shaped buffer airbags (12), and the outer walls of the two arc-shaped buffer airbags (12) are connected to an arc-shaped conduit (13).

5. The method for constructing a curtain grouting system for the toe slab of a hydropower station according to claim 1, characterized in that, The insufficient grouting pressure reminder mechanism (6) includes a connecting cover (61) and a support tube (62) fixedly connected to the upper surface of the sealing grounding ring (10). An indicator light (63) is fixedly connected to the top of the support tube (62). A fixing hole is opened on the upper surface of the sealing grounding ring (10) at the top of the grouting hole, and an air inlet one-way valve (64) is fixedly connected to the wall of the fixing hole. The output end of the air inlet one-way valve (64) is located inside the connecting cover (61). A pressure valve (65) is fixedly connected to the top of the connecting cover (61), and a touch switch (66) is fixedly connected to the inner wall of the connecting cover (61).

6. The method for constructing a curtain grouting system for the toe slab of a hydropower station according to claim 1, characterized in that, The walls of the multiple air inlets of the air guide volute (92) are fixedly connected with multiple fine mesh filters (5), and the thickness of the fine mesh filters (5) is 0.3-0.4 mm.

7. The method for constructing a curtain grouting system for a hydropower station toe slab according to claim 1, characterized in that, The toe slab curtain of the hydropower station extends along the toe slab of the hydropower station towards the mountains on both banks, and connects with the seepage prevention curtains of the mountains on the left and right banks respectively after reaching the dam shoulders.

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