A method for constructing water-stopping curtain in sand and gravel strata

Abstract

The present invention belongs to the field of building construction, and specifically is a method for constructing a water-stop curtain in a sand and gravel stratum, comprising a vehicle body, a drill rod, a sleeve, an electric push cylinder, a base and an elastic arc plate; the rear end of the vehicle body is fixedly connected to the sleeve, the rear end of the vehicle body is provided with a drill rod, the outer ring of the drill rod is sleeved on the inner ring of the sleeve, a plurality of electric push cylinders are provided at the bottom of the sleeve, the bottom end of the piston rod of the electric push cylinder is hinged to the base, the top of the groove of the base is fixedly connected to the elastic arc plate, the middle part of the elastic arc plate is provided with a square groove, the inner ring of the square groove is sleeved on the outer ring of the drill rod; when working, the electric push cylinder pushes the base to move downward, so that the base is close to the ground, the elastic arc plate contacts the ground and bends to push outward of the groove of the base, and pushes out the sand and gravel on the ground, and the drill rod drills holes under the drive of a motor, which reduces the sand and gravel on the ground affecting the drilling of the drill rod, thereby improving the stability and accuracy of the drilling of the drill rod.

Description

Technical Field

[0001] The invention belongs to the field of building construction, in particular to a method for constructing a water-stop curtain in a sand and gravel stratum. Background Art

[0002] The water-stop curtain is a general term for the peripheral water-stopping system of the main body of the project. It is a continuous water-stopping body used to prevent or reduce the inflow of groundwater into the foundation pit. The water-stop curtain is mainly divided into three parts: the retaining pile part, which is used to block the effect of the earth wall and can be made of reinforced concrete bored piles or other forms of piles; the water-stop curtain part, which consolidates the soil behind the retaining wall and blocks the exchange of water layers. Cement-soil mixing piles or compaction grouting can be used; the support part, which is used for support reinforcement.

[0003] A Chinese patent with publication number CN111733851A discloses a method for constructing a rotary jet water-stop curtain under water-rich sand and gravel geological conditions, comprising the following steps: excavating a pile hole downward at the pile position to be constructed, and lowering a protective tube into the pile hole as the excavation depth increases until the excavation is completed; lowering a sand control pipe with a closed bottom into the protective tube so that the sand control pipe passes through the pile hole; pulling out the protective tube upward until the protective tube is completely removed; lowering a rotary jet pipe into the sand control pipe to the bottom of the sand control pipe; using the rotary jet pipe to jet high-pressure air and slurry into the sand control pipe, the high-pressure air and slurry smash the wall of the sand control pipe and cut the surrounding soil, so that the slurry fills the stratum gaps and solidifies to form a rotary jet pile. The construction method of the rotary jet water-stop curtain under water-rich sand and gravel geological conditions of the present invention is more reliable, efficient, economical and practical.

[0004] When high-pressure rotary jet pile construction is carried out in sand and gravel strata, it is difficult for the high-pressure rotary jet drill to drill directly due to the influence of the sand and gravel on the surface of the stratum. When the high-pressure rotary jet drill is used directly for drilling, it is easy to cause damage to the drill bit of the high-pressure rotary jet drill and the deviation of the drill hole, resulting in the scrapping of the drill hole and large economic losses.

[0005] To this end, the present invention provides a sand and gravel stratum water-stop curtain construction method. Summary of the invention

[0006] In order to make up for the deficiencies of the prior art, at least one technical problem raised in the background technology is solved.

[0007] The technical solution adopted by the present invention to solve the technical problem is: a sand and gravel stratum water-stop curtain construction method described in the present invention comprises the following steps:

[0008] S1: Drilling preparation: Before high-pressure jet grouting pile construction in gravel and sand formations, the vehicle body is driven to the drilling area, the drill rod is aligned with the drilling position, and the electric push cylinder pushes the base downward so that the base is close to the ground. At this time, the elastic arc plate contacts the ground and bends, and pushes outward of the groove of the base, pushing out the gravel on the ground. The drill rod is driven by the motor to drill a hole, and the mud protects the wall to form a hole. The vehicle drilling rig is moved out to prepare for the next drilling.

[0009] S2: Positioning of high-pressure jet drilling rig: Move the high-pressure jet drilling rig in, check the drill bit diameter, connect the slurry delivery pipeline, check the connection between the main machine parts and whether the cement slurry mixing tank and delivery pump are normal, make necessary adjustments and tightening work, and the center of the drill bit is facing the drill hole;

[0010] S3: Prepare slurry: Use a cement mixer to mix the cement evenly. The prepared slurry should be stirred continuously to make it uniform and stable, and then poured into the aggregate hopper for spraying; the cement used is ordinary Portland cement with a strength grade of 42.5Mpa. The cement slurry must be stirred evenly. The mixing time of the cement slurry is not less than 3 minutes each time. The specific gravity of the cement slurry should be measured at any time to control the water-cement ratio to 1.0;

[0011] S4: Drilling and reaming: Start the drilling rig, supply water and air, and send the triple tube to the specified depth; the water pressure is temporarily set at 20MPa, the water flow rate is 100L / min, the air pressure is temporarily set at 0.8MPa, and the air flow rate is temporarily set at 3L / min;

[0012] S5: Jet grouting lifting: When the jet grouting pipe reaches the specified depth, it will then be jetted from bottom to top, and the mud will be cleaned and discharged at the same time; when jetting, the predetermined jet pressure should be reached first, and then the jetting pipe should be gradually lifted after the grouting to prevent the jetting pipe from being twisted off; to ensure the quality of the bottom of the pile, when the nozzle sinks to the designed depth, it will rotate at the original position for about 10 seconds, and then jet and lift after the grouting at the hole is normal; the rotation and lifting of the drill rod should be carried out continuously without interruption. If the drilling rig fails, the lifting and rotation of the drill rod should be stopped to prevent the pile from breaking, and the fault should be repaired and eliminated immediately. To improve the quality of the bottom of the pile, the jetting time of the drill rod should be appropriately increased within 1.0m of the bottom of the pile; during the jet lifting process, the jet parameters can be adjusted according to different soil layers;

[0013] S6: Flushing: After the spraying construction is completed, the grouting pipe and other machinery and equipment should be rinsed with clean water to prevent solidification and blockage; no cement slurry should remain in the pipe or machine; inject an appropriate amount of clean water into the slurry tank, turn on the high-pressure pump, and clean the remaining cement slurry in all pipelines until it is basically clean; and clean the soil adhering to the spraying pipe head;

[0014] S7: After the pile is formed, the high-pressure jet grouting drill is moved and the above steps S1 to S6 are repeated to construct the next pile.

[0015] Preferably, the automobile drilling rig comprises a vehicle body, a drill rod, a sleeve, an electric push cylinder, a base and an elastic arc plate; the rear part of the vehicle body is fixedly connected to the sleeve, the rear part of the vehicle body is provided with a drill rod, the outer ring of the drill rod is sleeved in the inner ring of the sleeve, a plurality of electric push cylinders are provided at the bottom of the sleeve, the bottom end of the piston rod of the electric push cylinder is hinged to the base, the top of the groove of the base is fixedly connected to the elastic arc plate, the middle part of the elastic arc plate is provided with a square groove, the inner ring of the square groove is sleeved in the outer ring of the drill rod; when working, before high-pressure rotary jet pile construction is carried out in sand and gravel formations, the vehicle body is driven to the area with drilling holes, so that the drill rod is aligned with the drilling position, and the electric push cylinder pushes the base to move downward, so that the base is close to the ground. At this time, the elastic arc plate contacts the ground and bends to push outward of the groove of the base, pushing out the sand and pebbles on the ground, and the drill rod is driven by the motor to drill holes, which reduces the impact of the sand and pebbles on the ground on the drill rod drilling, thereby improving the stability and accuracy of the drill rod drilling.

[0016] Preferably, an installation groove is provided at one end of the elastic arc plate away from the base, and a push plate is rotatably installed inside the installation groove, and a No. 1 spring is fixedly connected to a circular hole on one side of the installation groove close to the base, and the other end of the No. 1 spring is fixedly connected to the push plate; when working, after the elastic arc plate contacts the ground, the bottom end of the push plate contacts the ground, and when the elastic arc plate slides against the ground, the bottom end of the push plate slides along the ground, compressing the No. 1 spring, and the elastic force of the No. 1 spring pushes the push plate to move outward, bouncing the pushed sand and pebbles, thereby improving the cleaning efficiency of the sand and pebbles on the ground.

[0017] Preferably, a water tank is provided on the top surface of the vehicle body, an inner cavity is provided inside the base, a groove is provided on the bottom surface of the base, a guide rod is fixedly connected to the middle part of the top surface of the inner cavity, a sleeve rod is slidably mounted on the outer ring of the guide rod, the bottom end of the sleeve rod slides through the bottom wall of the inner cavity, the bottom end of the sleeve rod is fixedly connected to a bottom plate, the side wall of the bottom plate slides with the side wall of the groove, a pressure plate is fixedly connected to the top outer ring of the sleeve rod, an annular water bag is fixedly connected to the bottom surface of the inner cavity, the top surface of the annular water bag is fixedly connected to the bottom surface of the pressure plate, a plurality of No. 2 springs are fixedly connected between the top surface of the pressure plate and the top surface of the inner cavity, the water tank is connected to the annular water bag through a pipeline, and the bottom A plurality of nozzles are fixedly connected to the top of the groove of the seat, and the bottom pipe of the annular water bag is connected to the nozzle, and the water outlet of the nozzle is slidably matched with the top of the elastic arc plate; when working, the water tank is filled with water, and the base moves downward so that the bottom plate contacts the ground, pushing the sleeve rod to slide into the inner cavity along the guide rod, driving the pressure plate to slide upward, so that the annular water bag expands to generate negative pressure, and the water in the water tank is sucked into the annular water bag; when the drilling is completed, the base moves upward, and the No. 2 spring is reset, pushing the pressure plate to slide downward, so that the annular water bag is compressed, and the water inside is pressed into the nozzle and sprayed onto the surface of the elastic arc plate, so as to clean the mud on the surface of the elastic arc plate and improve the cleanliness of the elastic arc plate.

[0018] Preferably, the bottom surface of the annular water bag is connected to a tube body, the bottom end pipe of the tube body is connected to a water tank, a concave panel is fixedly connected to the middle part of the tube body, a plurality of through holes are opened on the outer ring of the concave panel, a sliding rod is slidably installed on the middle part of the concave panel, a circular plate is fixedly connected to the bottom end of the sliding rod, the outer wall of the circular plate is slidably matched with the concave inner wall of the concave panel, a top plate is fixedly connected to the top end of the sliding rod, the bottom surface of the top plate is slidably matched with the bottom surface of the annular water bag; during operation, when the water in the water tank is sucked into the annular water bag, the circular plate is pushed to slide upward, so that the top plate is separated from the top surface of the tube body, so that the water in the water tank enters the annular water bag, and when the annular water bag stops expanding, the water pressure in the annular water bag causes the top plate to press tightly against the top surface of the tube body to seal the tube body, thereby reducing the probability of the water in the annular water bag flowing back into the water tank.

[0019] Preferably, a sealing ring is fixedly connected to the outer ring of the circular plate, and the outer ring of the sealing ring is slidably matched with the inner ring of the tube body; during operation, the circular plate slides upward and slides into the groove of the concave panel, and the sealing ring is blocked by the groove of the concave panel and bends, so that the outer ring of the sealing ring is separated from the inner wall of the tube body, allowing water to flow through the gap between the sealing ring and the tube body into the annular water bag; when the annular water bag stops expanding, the circular plate slides downward, so that the sealing ring expands toward the outer ring, sealing the tube body, further reducing the probability of water in the annular water bag flowing back into the water tank.

[0020] Preferably, an annular groove is provided on the outer circle of the bottom surface of the top plate, a hollow ring is fixedly connected to the inside of the annular groove, an expansion chamber is provided inside the sealing ring, and air holes are provided inside the sliding rod, the circular plate and the top plate, the top end of the air hole is connected to the hollow ring, and the bottom end of the air hole is connected to the expansion chamber; when working, the top plate presses tightly against the top surface of the tube body, so that the hollow ring is compressed and fits the bottom surface of the annular water bag, and the gas in the hollow ring enters the expansion chamber through the air hole, causing the sealing ring to expand, thereby further improving the sealing effect of the sealing ring on the tube body.

[0021] Preferably, a rubber pad is fixedly connected to the top of the elastic arc plate, and the outer wall of the rubber pad is slidably matched with the water outlet of the nozzle; when working, the elastic arc plate contacts the ground and bends and pushes out, so that the rubber pad contacts the nozzle, blocks and seals the nozzle, and prevents the water in the annular water bag from spraying out of the nozzle when the drill rod is drilling a hole; when the base moves upward, the elastic arc plate is reset, so that the rubber pad is separated from the nozzle, and the water in the annular water bag is sprayed out of the nozzle, thereby realizing the control of the cleaning time of the elastic arc plate.

[0022] Preferably, an impact bar is fixedly connected to the bottom of the groove of the base, and impact blocks are fixedly connected to both sides of the middle part of the elastic arc plate, and the impact blocks slide in cooperation with the impact bar; during operation, when the base moves upward, the elastic arc plate is reset, so that the impact block hits the impact bar, causing the elastic arc plate to vibrate, further shaking off the dirt on the surface of the elastic arc plate, thereby further improving the cleanliness of the elastic arc plate.

[0023] The beneficial effects of the present invention are as follows:

[0024] 1. A method for constructing a water-stop curtain in a sand and gravel formation described in the present invention comprises the following steps: arranging a vehicle body, a drill rod, a sleeve, an electric push cylinder, a base and an elastic arc plate; before carrying out high-pressure rotary jetting pile construction in a sand and gravel formation, the vehicle body is driven to an area with holes so that the drill rod is aligned with the drilling position, and the electric push cylinder pushes the base downward so that the base is close to the ground. At this time, the elastic arc plate contacts the ground and bends to be pushed outward of a groove of the base, pushing out the sand and gravel on the ground, and the drill rod drills holes under the drive of a motor, thereby reducing the influence of the sand and gravel on the ground on the drilling of the drill rod, thereby improving the stability and accuracy of the drilling of the drill rod.

[0025] 2. The method for constructing a water-stop curtain in a sand and gravel formation described in the present invention comprises the following steps: a water tank, a guide rod, a sleeve rod, a pressure plate, an annular water bag, a No. 2 spring and a nozzle are arranged; the water tank is filled with water, and the base moves downward so that the bottom plate contacts the ground, and the sleeve rod is pushed along the guide slide into the inner cavity, driving the pressure plate to slide upward, so that the annular water bag expands and generates negative pressure, and the water in the water tank is sucked into the annular water bag; when the drilling is completed, the base moves upward, and the No. 2 spring is reset, pushing the pressure plate to slide downward, so that the annular water bag is compressed, and the water inside is pressed into the nozzle and sprayed onto the surface of the elastic arc plate, so as to clean the mud on the surface of the elastic arc plate and improve the cleanliness of the elastic arc plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The present invention will be further described below in conjunction with the accompanying drawings.

[0027] Figure 1 is a three-dimensional diagram of the first embodiment of the present invention;

[0028] Figure 2 is a front view of the first embodiment of the present invention;

[0029] Figure 3 yes Figure 2 A partial enlarged view of the middle part;

[0030] Figure 4 yes Figure 3 A partial enlarged view of point B in the middle;

[0031] Figure 5 yes Figure 4 A partial enlarged view of point C in the middle;

[0032] Figure 6 yes Figure 4 A partial enlarged view of point D in the middle;

[0033] Figure 7 yes Figure 4 A partial enlarged view of point E in the middle;

[0034] Figure 8It is a bottom structure diagram of the second seat of the embodiment of the present invention;

[0035] Fig. 9 It is a flow chart of the construction method of the present invention;

[0036] In the figure: 1. body; 2. drill rod; 3. sleeve; 4. electric push cylinder; 5. base; 6. elastic arc plate; 7. square groove; 8. mounting groove; 9. push plate; 10. spring No. 1; 11. water tank; 12. inner cavity; 13. groove; 14. guide rod; 15. sleeve rod; 16. bottom plate; 17. pressure plate; 18. annular water bag; 19. spring No. 2; 20. nozzle; 21. tube body; 22. concave panel; 23. through hole; 24. slide rod; 25. round plate; 26. top plate; 27. sealing ring; 28. ring groove; 29. ​​hollow ring; 30. expansion cavity; 31. air hole; 32. rubber pad; 33. impact strip; 34. impact block; 35. elastic rod; 36. hammer head; 37. spring No. 3. DETAILED DESCRIPTION

[0037] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0038] Embodiment 1

[0039] like Fig. 9 As shown, a method for constructing a water-stop curtain in a sand and gravel formation according to an embodiment of the present invention comprises the following steps:

[0040] S1: Drilling preparation: Before high-pressure jet grouting pile construction in the gravel and sand formation, the vehicle body 1 is driven to the drilling area, the drill rod 2 is aligned with the drilling position, and the electric push cylinder 4 pushes the base 5 downward to make the base 5 close to the ground. At this time, the elastic arc plate 6 contacts the ground and bends to push outward of the groove of the base 5, pushing out the gravel on the ground. The drill rod 2 is driven by the motor to drill a hole, the mud wall is protected, and the drill rig is moved out to prepare for the next drilling.

[0041] S2: Positioning of high-pressure jet drilling rig: Move the high-pressure jet drilling rig in, check the drill bit diameter, connect the slurry delivery pipeline, check the connection between the main machine parts and whether the cement slurry mixing tank and delivery pump are normal, make necessary adjustments and tightening work, and the center of the drill bit is facing the drill hole;

[0042] S3: Prepare slurry: Use a cement mixer to mix the cement evenly. The prepared slurry should be stirred continuously to make it uniform and stable, and then poured into the aggregate hopper for spraying; the cement used is ordinary Portland cement with a strength grade of 42.5Mpa. The cement slurry must be stirred evenly. The mixing time of the cement slurry is not less than 3 minutes each time. The specific gravity of the cement slurry should be measured at any time to control the water-cement ratio to 1.0;

[0043] S4: Drilling and reaming: Start the drilling rig, supply water and air, and send the triple tube to the specified depth; the water pressure is temporarily set at 20MPa, the water flow rate is 100L / min, the air pressure is temporarily set at 0.8MPa, and the air flow rate is temporarily set at 3L / min;

[0044] S5: Jet grouting lifting: When the jet grouting pipe reaches the specified depth, it will then be jetted from bottom to top, and the mud will be cleaned and discharged at the same time; when jetting, the predetermined jet pressure should be reached first, and then the jetting pipe should be gradually lifted after the grouting to prevent the jetting pipe from being twisted off; to ensure the quality of the bottom of the pile, when the nozzle sinks to the designed depth, it will rotate at the original position for about 10 seconds, and then jet and lift after the grouting at the hole is normal; the rotation and lifting of the drill rod should be carried out continuously without interruption. If the drilling rig fails, the lifting and rotation of the drill rod should be stopped to prevent the pile from breaking, and the fault should be repaired and eliminated immediately. To improve the quality of the bottom of the pile, the jetting time of the drill rod should be appropriately increased within 1.0m of the bottom of the pile; during the jet lifting process, the jet parameters can be adjusted according to different soil layers;

[0045] S6: Flushing: After the spraying construction is completed, the grouting pipe and other machinery and equipment should be rinsed with clean water to prevent solidification and blockage; no cement slurry should remain in the pipe or machine; inject an appropriate amount of clean water into the slurry tank, turn on the high-pressure pump, and clean the remaining cement slurry in all pipelines until it is basically clean; and clean the soil adhering to the spraying pipe head;

[0046] S7: After the pile is formed, the high-pressure jet grouting drill is moved and the above steps S1 to S6 are repeated to construct the next pile.

[0047] like Figures 1 to 4 As shown, the automobile drilling rig includes a body 1, a drill rod 2, a sleeve 3, an electric push cylinder 4, a base 5 and an elastic arc plate 6; the rear of the body 1 is fixedly connected to the sleeve 3, the rear of the body 1 is provided with a drill rod 2, the outer ring of the drill rod 2 is sleeved in the inner ring of the sleeve 3, a plurality of electric push cylinders 4 are provided at the bottom of the sleeve 3, the bottom end of the piston rod of the electric push cylinder 4 is hinged to the base 5, the top of the groove of the base 5 is fixedly connected to the elastic arc plate 6, the middle of the elastic arc plate 6 is provided with a square groove 7, the inner ring of the square groove 7 is sleeved in the drill The outer ring of the rod 2; when working, before the high-pressure rotary jet pile construction is carried out in the sand and gravel stratum, the vehicle body 1 is driven to the area with drilling holes, so that the drill rod 2 is aligned with the drilling position, and the electric push cylinder 4 pushes the base 5 to move downward, so that the base 5 is close to the ground. At this time, the elastic arc plate 6 contacts the ground and bends to push outward of the groove of the base 5, pushing out the sand and gravel on the ground. The drill rod 2 is driven by the motor to drill holes, which reduces the impact of the sand and gravel on the ground on the drill rod 2 to drill holes, thereby improving the stability and accuracy of the drill rod 2 drilling holes.

[0048] like Figure 5As shown, a mounting groove 8 is provided at one end of the elastic arc plate 6 away from the base 5, and a push plate 9 is rotatably installed inside the mounting groove 8. A No. 1 spring 10 is fixedly connected to a circular hole on one side of the mounting groove 8 close to the base 5, and the other end of the No. 1 spring 10 is fixedly connected to the push plate 9; when working, after the elastic arc plate 6 contacts the ground, the bottom end of the push plate 9 contacts the ground, and when the elastic arc plate 6 slides against the ground, the bottom end of the push plate 9 slides along the ground, compressing the No. 1 spring 10. The elastic force of the No. 1 spring 10 pushes the push plate 9 to move outward, bouncing the pushed sand and pebbles, thereby improving the cleaning efficiency of the sand and pebbles on the ground.

[0049] like Figure 1 and Figure 4 As shown, a water tank 11 is provided on the top surface of the vehicle body 1, an inner cavity 12 is provided inside the base 5, a groove 13 is provided on the bottom surface of the base 5, a guide rod 14 is fixedly connected to the middle of the top surface of the inner cavity 12, a sleeve rod 15 is slidably mounted on the outer ring of the guide rod 14, the bottom end of the sleeve rod 15 slides through the bottom wall of the inner cavity 12, a bottom plate 16 is fixedly connected to the bottom end of the sleeve rod 15, the side wall of the bottom plate 16 is slidably matched with the side wall of the groove 13, a pressure plate 17 is fixedly connected to the top outer ring of the sleeve rod 15, an annular water bag 18 is fixedly connected to the bottom surface of the inner cavity 12, the top surface of the annular water bag 18 is fixedly connected to the bottom surface of the pressure plate 17, a plurality of No. 2 springs 19 are fixedly connected between the top surface of the pressure plate 17 and the top surface of the inner cavity 12, and the water tank 11 is connected to the annular water bag 1 through a pipeline. 8. A plurality of nozzles 20 are fixedly connected to the top of the groove of the base 5. The bottom pipe of the annular water bag 18 is connected to the nozzle 20. The water outlet of the nozzle 20 is slidably matched with the top of the elastic arc plate 6. When working, the water tank 11 is filled with water, and the base 5 moves downward, so that the bottom plate 16 contacts the ground, and the sleeve rod 15 is pushed to slide into the inner cavity 12 along the guide rod 14, driving the pressure plate 17 to slide upward, so that the annular water bag 18 expands to generate negative pressure, and the water in the water tank 11 is sucked into the annular water bag 18. When the drilling is completed, the base 5 moves up, and the No. 2 spring 19 is reset, pushing the pressure plate 17 to slide downward, so that the annular water bag 18 is compressed, and the internal water is pressed into the nozzle 20 and sprayed onto the surface of the elastic arc plate 6, so that the mud on the surface of the elastic arc plate 6 is cleaned, thereby improving the cleanliness of the elastic arc plate 6.

[0050] like Figure 6As shown, the bottom surface of the annular water bag 18 is connected to a tube body 21, the bottom end pipeline of the tube body 21 is connected to the water tank 11, the middle part of the tube body 21 is fixedly connected to a concave panel 22, the outer ring of the concave panel 22 is provided with a plurality of through holes 23, the middle part of the concave panel 22 is slidably mounted with a slide rod 24, the bottom end of the slide rod 24 is fixedly connected to a circular plate 25, the outer wall of the circular plate 25 is slidably matched with the concave inner wall of the concave panel 22, the top end of the slide rod 24 is fixedly connected to a top plate 26, the top The bottom surface of the plate 26 is slidably matched with the bottom surface of the annular water bag 18; during operation, when the water in the water tank 11 is sucked into the annular water bag 18, the circular plate 25 is pushed to slide upward, so that the top plate 26 is separated from the top surface of the tube body 21, and the water in the water tank 11 enters the annular water bag 18. When the annular water bag 18 stops expanding, the water pressure in the annular water bag 18 causes the top plate 26 to press tightly against the top surface of the tube body 21, sealing the tube body 21, thereby reducing the probability of the water in the annular water bag 18 flowing back into the water tank 11.

[0051] The outer ring of the circular plate 25 is fixedly connected with a sealing ring 27, and the outer ring of the sealing ring 27 is slidably matched with the inner ring of the tube body 21; when working, the circular plate 25 slides upward and slides into the groove of the concave panel 22, and the sealing ring 27 is blocked by the groove of the concave panel 22 and bends, so that the outer ring of the sealing ring 27 is separated from the inner wall of the tube body 21, so that the water flows through the gap between the sealing ring 27 and the tube body 21 into the annular water bag 18; when the annular water bag 18 stops expanding, the circular plate 25 slides downward, so that the sealing ring 27 expands to the outer ring, seals the tube body 21, and further reduces the probability of water in the annular water bag 18 flowing back into the water tank 11.

[0052] An annular groove 28 is provided on the outer circle of the bottom surface of the top plate 26, a hollow ring 29 is fixedly connected to the inside of the annular groove 28, an expansion chamber 30 is provided inside the sealing ring 27, and air holes 31 are provided inside the sliding rod 24, the circular plate 25 and the top plate 26, the top end of the air hole 31 is connected to the hollow ring 29, and the bottom end of the air hole 31 is connected to the expansion chamber 30; when working, the top plate 26 presses the top surface of the tube body 21, so that the hollow ring 29 is compressed and fits the bottom surface of the annular water bag 18, and the gas in the hollow ring 29 enters the expansion chamber 30 through the air hole 31, so that the sealing ring 27 expands, thereby further improving the sealing effect of the sealing ring 27 on the tube body 21.

[0053] like Figure 7As shown, a rubber pad 32 is fixed to the top of the elastic arc plate 6, and the outer wall of the rubber pad 32 is slidably matched with the water outlet of the nozzle 20; when working, the elastic arc plate 6 contacts the ground and bends and pushes out, so that the rubber pad 32 contacts the nozzle 20, and the nozzle 20 is blocked and sealed, thereby preventing the water in the annular water bag 18 from spraying out from the nozzle 20 when the drill rod 2 is drilling a hole; when the base 5 moves up, the elastic arc plate 6 is reset, so that the rubber pad 32 is separated from the nozzle 20, and the water in the annular water bag 18 is sprayed out from the nozzle 20, thereby realizing the control of the cleaning time of the elastic arc plate 6.

[0054] like Figure 4 As shown, an impact bar 33 is fixedly connected to the bottom of the groove of the base 5, and impact blocks 34 are fixedly connected to both sides of the middle of the elastic arc plate 6, and the impact blocks 34 slide in cooperation with the impact bar 33; during operation, when the base 5 moves up, the elastic arc plate 6 is reset, so that the impact block 34 hits the impact bar 33, causing the elastic arc plate 6 to vibrate, further shaking off the soil on the surface of the elastic arc plate 6, and further improving the cleanliness of the elastic arc plate 6.

[0055] Embodiment 2

[0056] like Figure 8 As shown, compared with Example 1, another implementation of the present invention is: the elastic rod 35 is rotatably installed at the bottom of the side of the sleeve 3 away from the vehicle body 1, the bottom end of the elastic rod 35 is fixedly connected to the hammer head 36, and the middle part of the elastic rod 35 is fixedly connected to the bottom of the side away from the vehicle body 1, and the top of the No. 3 spring 37 is fixedly connected to the bottom surface of the sleeve 3; during operation, after the base 5 moves up, the base 5 pushes the elastic rod 35 to rotate and bend, so that the No. 3 spring 37 is compressed, and the hammer head 36 hits the base 5, thereby further improving the vibration intensity of the base 5, and then further improving the cleanliness of the base 5.

[0057] During operation: before high-pressure jet grouting pile construction is carried out in a sandy and gravel formation, the vehicle body 1 is driven to the area with drilling holes, the drill rod 2 is aligned with the drilling position, the electric push cylinder 4 pushes the base 5 to move downward, the bottom plate 16 contacts the ground, and the sleeve rod 15 is pushed along the guide rod 14 to slide into the inner cavity 12, driving the pressure plate 17 to slide upward, so that the annular water bag 18 expands to generate negative pressure, the circular plate 25 slides upward, so that the top plate 26 is separated from the top surface of the pipe body 21, the circular plate 25 slides upward and slides into the groove of the concave panel 22, the sealing ring 27 is blocked by the groove of the concave panel 22 and bends, so that the outer ring of the sealing ring 27 is separated from the inner wall of the pipe body 21, so that water flows through The water enters the annular water bag 18 through the gap between the sealing ring 27 and the tube body 21, and the water in the water tank 11 is sucked into the annular water bag 18. After the elastic arc plate 6 contacts the ground and bends and pushes out, the rubber pad 32 contacts the nozzle 20, blocking and sealing the nozzle 20; when the annular water bag 18 stops expanding, the water pressure in the annular water bag 18 causes the top plate 26 to press against the top surface of the tube body 21, and the hollow ring 29 compresses and fits the bottom surface of the annular water bag 18. The gas in the hollow ring 29 enters the expansion chamber 30 through the air hole 31, causing the sealing ring 27 to expand, so that the sealing ring 27 is expanded to the outer circle, the tube body 21 is sealed, and the water is stored in the annular water bag 18;

[0058] The base 5 is close to the ground, the elastic arc plate 6 contacts the ground and bends to push outward of the groove of the base 5, and the bottom end of the push plate 9 contacts the ground. When the elastic arc plate 6 slides against the ground, the bottom end of the push plate 9 slides along the ground, so that the No. 1 spring 10 is compressed, and the elastic force of the No. 1 spring 10 pushes the push plate 9 to move outward, bounces the pushed sand and pebbles, and pushes out the sand and pebbles on the ground; the drill rod 2 passes through the square groove 7, and the drill rod 2 is driven by the motor to drill holes;

[0059] When the drilling hole is in contact, the drill rod 2 is lifted; the electric push cylinder 4 drives the base 5 to move upward, and the elastic arc plate 6 is reset, so that the rubber pad 32 is separated from the nozzle 20, and the impact block 34 hits the impact bar 33, so that the elastic arc plate 6 vibrates, and the soil on the surface of the elastic arc plate 6 is shaken off. At the same time, the No. 2 spring 19 is reset, pushing the pressure plate 17 to slide downward, so that the annular water bag 18 is compressed, and the water inside is pressed into the nozzle 20 and sprayed onto the surface of the elastic arc plate 6, so as to clean the soil on the surface of the elastic arc plate 6 and improve the cleanliness of the elastic arc plate 6.

[0060] The above-mentioned front, back, left, right, top and bottom are all based on the figures in the specification. Figure 1 As a benchmark, according to the person's observation perspective, the side of the device facing the observer is defined as the front, the left side of the observer is defined as the left, and so on.

[0061] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the scope of protection of the present invention.

[0062] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A method for constructing a water-stop curtain in a sand and gravel stratum, characterized in that: The construction method includes the following steps: S1: Drilling preparation: Before high-pressure jet grouting pile construction in sandy gravel strata, a car drill is used to guide the hole, mud wall protection, and drill hole formation. The car drill is moved out to prepare for the next drilling; S2: Positioning of high-pressure jet drilling rig: Move the high-pressure jet drilling rig in, check the drill bit diameter, connect the slurry delivery pipeline, check the connection between the main machine parts and whether the cement slurry mixing tank and delivery pump are normal, make adjustments and tighten them, and make sure the center of the drill bit is facing the drill hole; S3: Prepare slurry: Use a cement mixer to mix the cement evenly. The prepared slurry should be stirred continuously to make it uniform and stable, and the slurry is poured into the collecting hopper for spraying; S4: Drilling and reaming: Start the drilling rig, supply water and air, and send the triple pipe to the specified depth; S5: Jet grouting lifting: When the jet grouting pipe reaches the specified depth, it will then be sprayed from bottom to top, and the mud will be cleaned and discharged at the same time; S6: Flushing: After the spraying construction is completed, the grouting pipes and equipment should be flushed with clean water to prevent solidification and blockage; S7: After the pile is formed, the high-pressure jet grouting drill is moved, and the above S1 to S6 are repeated to construct the next pile; The automobile drilling rig comprises a vehicle body (1), a drill rod (2), a sleeve (3), an electric push cylinder (4), a base (5) and an elastic arc plate (6); the rear of the vehicle body (1) is fixedly connected to the sleeve (3); the rear of the vehicle body (1) is provided with a drill rod (2); the outer ring of the drill rod (2) is sleeved on the inner ring of the sleeve (3); a plurality of electric push cylinders (4) are provided at the bottom of the sleeve (3); the bottom end of the piston rod of the electric push cylinder (4) is hinged to the base (5); the top of the groove of the base (5) is fixedly connected to the elastic arc plate (6); a square groove (7) is opened in the middle of the elastic arc plate (6); the inner ring of the square groove (7) is sleeved on the outer ring of the drill rod (2); An end of the elastic arc plate (6) away from the base (5) is provided with a mounting groove (8), a push plate (9) is rotatably mounted inside the mounting groove (8), a first spring (10) is fixedly connected to a circular hole on one side of the mounting groove (8) close to the base (5), and the other end of the first spring (10) is fixedly connected to the push plate (9); The top surface of the vehicle body (1) is provided with a water tank (11); an inner cavity (12) is provided inside the base (5); a groove (13) is provided on the bottom surface of the base (5); a guide rod (14) is fixedly connected to the middle of the top surface of the inner cavity (12); a sleeve rod (15) is slidably mounted on the outer ring of the guide rod (14); the bottom end of the sleeve rod (15) slides through the bottom wall of the inner cavity (12); a bottom plate (16) is fixedly connected to the bottom end of the sleeve rod (15); the side wall of the bottom plate (16) is slidably matched with the side wall of the groove (13); the top outer ring of the sleeve rod (15) is fixedly connected to the inner cavity (12); the outer ring of the top end ... A pressure plate (17) is provided, an annular water bag (18) is fixedly connected to the bottom surface of the inner cavity (12), the top surface of the annular water bag (18) is fixedly connected to the bottom surface of the pressure plate (17), a plurality of No. 2 springs (19) are fixedly connected between the top surface of the pressure plate (17) and the top surface of the inner cavity (12), the water tank (11) is connected to the annular water bag (18) through a pipeline, a plurality of nozzles (20) are fixedly connected to the top of the groove of the base (5), the bottom pipeline of the annular water bag (18) is connected to the nozzle (20), and the water outlet of the nozzle (20) is slidably matched with the top of the elastic arc plate (6).

2. A sand and gravel stratum water-stop curtain construction method according to claim 1, characterized in that: The bottom surface of the annular water bag (18) is connected to a tube body (21), the bottom end of the tube body (21) is connected to a water tank (11), a concave panel (22) is fixedly connected to the middle of the tube body (21), a plurality of through holes (23) are provided on the outer ring of the concave panel (22), a slide rod (24) is slidably mounted on the middle of the concave panel (22), a circular plate (25) is fixedly connected to the bottom end of the slide rod (24), the outer wall of the circular plate (25) is slidably matched with the concave inner wall of the concave panel (22), a top plate (26) is fixedly connected to the top end of the slide rod (24), and the bottom surface of the top plate (26) is slidably matched with the bottom surface of the annular water bag (18).

3. A sand and gravel stratum water-stop curtain construction method according to claim 2, characterized in that: The outer ring of the circular plate (25) is fixedly connected to a sealing ring (27), and the outer ring of the sealing ring (27) is slidably matched with the inner ring of the tube body (21).

4. A sand and gravel stratum water-stop curtain construction method according to claim 3, characterized in that: The outer ring of the bottom surface of the top plate (26) is provided with an annular groove (28), a hollow ring (29) is fixedly connected to the inside of the annular groove (28), an expansion chamber (30) is provided inside the sealing ring (27), and air holes (31) are provided inside the sliding rod (24), the circular plate (25) and the top plate (26), the top end of the air hole (31) is connected to the hollow ring (29), and the bottom end of the air hole (31) is connected to the expansion chamber (30).

5. The method for constructing a water-stop curtain in a sand and gravel formation according to claim 1, characterized in that: A rubber pad (32) is fixedly connected to the top of the elastic arc plate (6), and the outer wall of the rubber pad (32) is slidably matched with the water outlet of the nozzle (20).

6. The method for constructing a water-stop curtain in a sand and gravel formation according to claim 1, characterized in that: The bottom of the groove of the base (5) is fixedly connected to an impact strip (33), and both sides of the middle of the elastic arc plate (6) are fixedly connected to impact blocks (34), and the impact blocks (34) are slidably matched with the impact strip (33).

7. The method for constructing a water-stop curtain in a sand and gravel formation according to claim 1, characterized in that: An elastic rod (35) is rotatably mounted on the bottom of a side of the sleeve (3) away from the vehicle body (1); a hammer head (36) is fixedly connected to the bottom end of the elastic rod (35); a third spring (37) is fixedly connected to the bottom of a side of the middle of the elastic rod (35) away from the vehicle body (1); and a top end of the third spring (37) is fixedly connected to the bottom surface of the sleeve (3).

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