Device and method for preventing and treating water leakage of subway station in water-rich stratum

Abstract

In the grouting process, an inserting pipe is inserted into a repairing position, then a pump truck is started, materials can be conveyed into the inserting pipe and finally discharged to the repairing position through the inserting pipe, then a servo motor is started, the servo motor drives a gear ring to rotate through a small gear, and the materials are conveyed to the repairing position through the gear ring. In the rotating process of the gear ring, the top head is driven to eject the top frame, the top frame can move upwards after being ejected by the top head, the top frame can be pulled by the first spring to move downwards after moving upwards, and the scraping ring can scrape the discharge port in a reciprocating mode, so that materials can be discontinuously discharged from the discharge port, and a certain space exists between the newly discharged materials and materials outside the insertion pipe; and therefore, new materials can be continuously discharged outwards, and external materials are prevented from being blocked at the position of the discharge port.

Description

Technical Field

[0001] The present application relates to the technical field of station water leakage prevention devices, and in particular to a water leakage prevention device and a prevention method for a subway station in a water-rich stratum. Background Art

[0002] With the rapid development of my country's economy, infrastructure construction has also accelerated. In order to alleviate the congestion of urban ground traffic, a wave of subway construction has been set off. The construction of urban subways can not only perfectly meet the needs but also does not occupy surface space. Subway construction started late in my country's transportation field, resulting in many construction units lacking experience in this field. In addition, the construction environment of subway projects is relatively special. The excavation depth of stations is relatively deep. In water-rich strata with high water head, the groundwater pressure is high. If there are cracks in the concrete structure, it may cause water leakage in the station.

[0003] Underground projects are located under the surface and are subject to the infiltration of groundwater for a long time. If the waterproofing of the structure is not done well, it will not only seriously affect the durability and service life of the structure, but also seriously affect the normal use of the building once the groundwater leaks into the building. It will also increase the cost of water plugging and maintenance in the later stage and increase the operating cost. At the same time, a large amount of water leakage may also cause the surrounding strata to settle and affect the groundwater environment. A large number of actual projects have proved that it is difficult and expensive to treat water leakage in underground structures. Summary of the invention

[0004] One of the purposes of the present application is to provide a water leakage prevention device and a prevention method for a subway station in a water-rich stratum.

[0005] In order to achieve the above purpose, the technical solution adopted in the present application is: a water leakage prevention device for a subway station in a water-rich stratum, comprising a pump truck, a connecting pipe, a connecting seat, a first handrail, a second handrail and a servo motor, the first handrail and the second handrail are respectively detachably connected to the two sides of the connecting seat, the connecting seat is detachably connected with a servo motor, the output end of the servo motor is provided with a rotating rod, the rotating rod is provided with a cross bar, the rotating rod is provided with a pinion, the pinion is meshingly connected with a gear ring, the output end of the gear ring is provided with a top head, the top head is overlapped with a top frame, the top frame is arranged on a scraper ring, the scraper ring is sleeved on the insert, the insert is provided with a discharge port, and the discharge ports are sequentially opened on the insert.

[0006] Preferably, the servo motor is arranged on the side of the connecting seat, the rotating rod and the insert tube at the output end of the servo motor are parallel to each other, the rotating rod and the insert tube have the same length, and the rotating rod and the cross bar are arranged in a cross shape as a whole.

[0007] Preferably, the scraper ring is arranged in a circular ring shape as a whole, the inner diameter of the scraper ring is the same as the outer diameter of the insert tube, the scraper rings outside the insert tube are sequentially sleeved on the insert tube, and a connecting frame is arranged between adjacent scraper rings.

[0008] Preferably, the connecting seat is detachably connected to a base, the base is arranged in an annular shape as a whole, and the base is rotatably connected to a rotating seat, the rotating seat is arranged in an annular shape as a whole.

[0009] Preferably, the base and the rotating seat are respectively arranged outside the cannula, the base, the rotating seat and the cannula are arranged coaxially, and a gear ring is arranged on the rotating seat of the base.

[0010] Preferably, a first spring is provided on the connecting seat, one end of the first spring is detachably connected to the connecting seat, and the other end of the first spring is detachably connected to the scraper ring.

[0011] Preferably, the first spring is sleeved on the insert tube, the first spring is located at the bottom of the insert tube, the scraper ring at the bottom of the insert tube is detachably connected to the first spring, and the scraper ring is coaxially arranged with the insert tube.

[0012] Preferably, the jack is arranged on a rotating seat, the jack is vertically arranged on the rotating seat, the upper end of the jack is inclined as a whole, and the inclined position of the jack overlaps the top frame.

[0013] Preferably, the top frame and the top head are arranged in a cross shape as a whole, the top frame is horizontally arranged on the side seat, the side seat is detachably connected to the connecting frame, and the top frame and the connecting frame are arranged in a cross shape as a whole.

[0014] In order to achieve the above purpose, another technical solution adopted by the present application is: a prevention and control method of a water leakage prevention device for a subway station in a water-rich stratum, comprising the following steps:

[0015] S1: During the construction of the subway station, a PVC pipe with a diameter of 4.2 cm is pre-buried at the side wall of the station, about 60 cm to 80 cm above the ground, and the construction height is higher than the water-stop steel plate. The pipe length is less than the wall thickness and 5 cm shorter than the wall thickness. A PVC pipe of the same size and spacing is also set at about 1 m below the bottom of the middle plate on the top of the wall, and is also higher than the water-stop steel plate at the joint. For details, see Figure 8 ;

[0016] S2: After the reinforcement is tied, press the pre-buried grouting pipe Figure 7 Put it in as shown, wrap the two ends with transparent tape to prevent concrete from pouring into it during pouring. The back side of the pre-buried PVC pipe is flush with the wall surface, and the front side is about 5cm away from the other side of the wall.

[0017] S3: The system grouting is divided into 3 cycles. The next cycle can only be started after the previous cycle is completed. The first grouting flow direction is: from the first negative second floor side wall to the last negative first floor side wall, covering the entire station from bottom to top. The second cycle of grouting is to supplement the grouting of the two rows of grouting holes on the negative first floor. The slurry injected into the last three rows is single-liquid slurry. The ground test found that the solid volume after standing is 50% to 60% of the original slurry volume. The second supplementary grouting is required to increase the filling height of the back slurry. Before the third cycle of grouting, all the closable precipitation wells are closed. At the same time, according to the leakage situation of the station after the previous cycle of grouting, supplementary grouting is carried out for the remaining leakage parts.

[0018] S4: The station system grouting adopts single-liquid cement slurry and double-liquid slurry with a water-cement ratio of 1:1. The cement strength grade should not be lower than 42.5MPa. The bottom row adopts double-liquid grouting, and the upper three rows adopt single-liquid cement slurry. Grouting is carried out on the side walls of the second and first-basement structures; the side walls of the first-basement structure will be grouted after confirming the scope and needs according to the leakage situation of the subsequent stations; grouting will start after the entire station is capped, and the first completed compartments will be grouted first in the order of completion of the station compartments to ensure that the concrete strength meets the requirements. Grouting is carried out from bottom to top, and the interval grouting of the grouting pipe at the bottom is first grouting, and the double-liquid grouting is carried out on the bottom row of grouting holes; the remaining holes are injected with pure cement slurry;

[0019] S5: The preliminary ratio of the double-liquid grouting slurry is shown in Table 1. The specific ratio is determined by the actual on-site test. The following ratio is based on the water-rich formation. In order to ensure that the slurry can solidify in time and have enough time to flow, the ground test is controlled according to the solidification time of 1 minute. If necessary, the ratio can be appropriately adjusted according to the actual on-site situation.

[0020] S6: Grouting of negative second side wall: ① Fig. 9 As shown in the figure, the bottom row of holes is first grouted with double liquid slurry in sequence, the spacing between the pre-buried holes is 5m, and the grouting pressure is not more than 0.5MPa. Fig. 9 As shown, before the construction of each construction section, the reserved holes are first punched and valves are installed; first open hole 1 and hole 2, grouting is performed on hole 1, and at the same time, the valve installed on hole 2 is opened to use it as a drain hole, and the water is forced out with slurry. When the concentration of cement slurry flowing out of hole 2 is close to that of the injected slurry, the valve of hole 2 is closed, and grouting of hole 1 is continued. When the pressure reaches 0.5MPa, the grouting of hole 1 is stopped and the valve of hole 1 is closed; after an interval of 10 minutes, the grouting hole 2 is opened to observe whether there is unsolidified slurry flowing out. If so, the valve is closed and observed every 10 minutes until no slurry flows out, and then double-liquid grouting is performed through hole 2, and the valve of hole 3 is opened in this order; the purpose of injecting double-liquid slurry in the first layer is to prevent the single-liquid slurry injected in the subsequent rows from flowing into the bottom in large quantities and causing cement waste;

[0021] ② After the grouting of the bottom grouting holes in each construction section is completed, the grouting of the second grouting holes is carried out. Fig. 9 For the middle grouting holes 5 to 7, starting from the second layer, the injected slurry is pure cement single-liquid slurry; before grouting, an indoor test is carried out, and the injected pure cement slurry is sampled with a measuring cup and left to stand for more than 8 hours. After the cement and water are separated into layers, the proportion of cement solids is recorded; when grouting the second layer of grouting holes, the grouting method is the same as the first row, and before grouting the grouting hole 5, the grouting holes 6, grouting holes 8 and grouting holes 9 are opened, and valves are installed; when the slurry flowing out of the grouting holes 6, grouting holes 8 and grouting holes 9 is close to the injected slurry, the valve is closed; after an interval of 20 hours, grouting is carried out on the grouting hole 6, and the grouting holes 7 and grouting holes 10 are opened at the same time, and the process is carried out in sequence;

[0022] ③ According to the test results, after being stationary, cement particles account for about 50% to 60%. After the slurry solidifies, there is actually no cement slurry at the third row of holes, but water. Therefore, it is necessary to grout the third row of holes in accordance with the grouting method of the second row of holes, and open the grouting holes on the adjacent sides and the top at the same time, and install valves; the condition for the completion of grouting of the third row of holes is that the grouting valves on the sides and the top flow out cement slurry at the same time, and then close the valves, referring to the grouting process of the second row of holes; for the top row of grouting holes, the number of grouting cycles is two; the first grouting stop condition is: slurry flows out of the adjacent holes, and slurry appears on the ground at the same time; after the grouting of the top row of holes is completed, pause for more than 20 hours, and then carry out the second grouting, and the suspension standard is slurry on the ground; grouting hole plugging: cement and organic quick-setting agent plugging materials are used;

[0023] S7: During the grouting process, the engineering team and the engineering department shall check and compare the settlement of the overall posture of the pipeline, buildings and stations every day, and provide real-time feedback on the monitoring data. Once the station body floats or the wall is deformed, the grouting shall be stopped immediately. On the day of grouting, the monitoring points within 15m before and after the grouting position shall be measured. If lifting or other displacement is found, for example, the displacement is greater than 5mm, timely feedback shall be given to the person in charge of the engineering team and engineering department at the work site.

[0024] Compared with the prior art, the beneficial effects of this application are:

[0025] The water leakage prevention device and prevention method for a subway station in a water-rich stratum comprises the following steps: inserting a plug into an expansion joint during grouting, and materials can be discharged through a discharge port of the plug; a servo motor is started during the discharge process, and the servo motor can drive a scraper ring to move up and down through transmission, and the scraper ring can scrape the discharge port back and forth, thereby preventing materials from being blocked at the discharge port during grouting.

[0026] The water leakage prevention device and prevention method for the subway station in water-rich strata adopts corresponding improvement measures at each node, and at the same time directly injects cement slurry into the waterproof membrane and the concrete side wall to fill the gap behind the wall, thus solving the problem of blocking the main leakage point and then leaking at the secondary weak point. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 The overall structure of the present invention is shown in FIG. Figure 1 .

[0028] Figure 2 The overall structure of the present invention is shown in FIG. Figure 2 .

[0029] Figure 3 A partial cross-sectional view of the present invention Figure 1 .

[0030] Figure 4 A partial cross-sectional view of the present invention Figure 2 .

[0031] Figure 5 It is a schematic diagram of the enlarged structure of area A in the present invention.

[0032] Figure 6 It is a schematic diagram of the enlarged structure of area B in the present invention.

[0033] Figure 7 It is a schematic diagram of the enlarged structure of the C region in the present invention.

[0034] Figure 8 It is a schematic diagram of the construction height in the present invention.

[0035] Fig. 9 It is a schematic diagram of the grouting hole in the present invention.

[0036] In the figure: 1. pump truck; 2. connecting pipe; 3. first handrail; 4. rotating rod; 5. cross bar; 6. insert tube; 7. discharge port; 8. scraper ring; 9. connecting frame; 10. pinion; 11. servo motor; 12. connecting seat; 13. gear ring; 14. base; 15. rotating seat; 16. first spring; 17. second handrail; 18. top head; 19. side seat; 20. top frame. DETAILED DESCRIPTION

[0037] Below, the present application is further described in conjunction with specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0038] In the description of the present application, it should be noted that directional words, such as the terms "center", "lateral", "longitudinal", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating directions and positional relationships are based on the directions or positional relationships shown in the accompanying drawings, which are only for the convenience of narrating the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and cannot be understood as limiting the specific scope of protection of the present application.

[0039] It should be noted that the terms "first", "second", etc. in the description and claims of the present application are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0040] like Figures 1 to 9 As shown, the water leakage prevention device for a subway station in a water-rich stratum provided by the present invention comprises a pump truck 1, a connecting pipe 2, a connecting seat 12, a first handrail 3, a second handrail 17 and a servo motor 11. The first handrail 3 and the second handrail 17 are respectively detachably connected to the two sides of the connecting seat 12. The servo motor 11 is detachably connected to the connecting seat 12. A rotating rod 4 is provided at the output end of the servo motor 11. A cross bar 5 is provided on the rotating rod 4. A pinion 10 is provided on the rotating rod 4. The pinion 10 is meshingly connected with a gear ring 13. A top head 18 is provided at the output end of the gear ring 13. A top frame 20 is overlapped on the top head 18. The top frame 20 is arranged on a scraper ring 8. The scraper ring 8 is sleeved on the insert pipe 6. A discharge port 7 is provided on the insert pipe 6. The discharge ports 7 are sequentially provided on the insert pipe 6.

[0041] During the grouting process, the cannula 6 is inserted into the repairing position, and then the pump truck 1 is started so that the material can be transported into the cannula 6, and finally discharged to the repairing position through the cannula 6, and then the servo motor 11 is started. The servo motor 11 will drive the gear ring 13 to rotate through the pinion 10. During the rotation of the gear ring 13, the push head 18 will be driven to push the top frame 20. After being pushed by the push head 18, the top frame 20 can move up, and after moving up, it will be pulled down by the first spring 16, and the scraper ring 8 can reciprocate to scrape the discharge port 7, so that the material can be discontinued when being discharged from the discharge port 7, so that there is a certain space between the newly discharged material and the material outside the cannula 6, so that the new material can continue to be discharged outward, avoiding the external material from being blocked at the discharge port 7.

[0042] The servo motor 11 is arranged on the side of the connecting seat 12. The rotating rod 4 at the output end of the servo motor 11 is parallel to the insertion tube 6. The rotating rod 4 and the insertion tube 6 have the same length. The rotating rod 4 and the cross bar 5 are arranged in a cross shape as a whole. The rotating rod 4 will rotate after being driven by the servo motor 11. During the rotation, the discharged material will be stirred. After stirring, the gas inside the material can be discharged, so that the internal holes of the material will be reduced after solidification. When the rotating rod 4 rotates, it will also drive the pinion 10 to rotate, and the pinion 10 can drive the gear ring 13 to rotate.

[0043] The scraper ring 8 is arranged in a circular ring shape as a whole, and the inner diameter of the scraper ring 8 is the same as the outer diameter of the insert tube 6. The scraper rings 8 outside the insert tube 6 are sleeved on the insert tube 6 in sequence, and a connecting frame 9 is arranged between adjacent scraper rings 8. When the scraper ring 8 is sleeved on the insert tube 6, the scraper ring 8 can move up and down along the insert tube 6, and the discharge port 7 will be scraped when it moves up and down.

[0044] The connecting seat 12 is detachably connected to a base 14, which is arranged in an annular shape as a whole. A rotating seat 15 is rotatably connected to the base 14, which is arranged in an annular shape as a whole. The rotating seat 15 can be restricted by the base 14, and the rotating seat 15 can rotate on the base 14.

[0045] The base 14 and the rotating seat 15 are respectively arranged outside the cannula 6, and the base 14, the rotating seat 15 and the cannula 6 are arranged coaxially, and the rotating seat 15 of the base 14 is provided with a gear ring 13. When the gear ring 13 is arranged on the rotating seat 15, the rotating seat 15 will also rotate when the gear ring 13 is driven, and the rotating seat 15 can rotate synchronously with the gear ring 13.

[0046] The connecting seat 12 is provided with a first spring 16, one end of the first spring 16 is detachably connected to the connecting seat 12, and the other end of the first spring 16 is detachably connected to the scraper ring 8. When the scraper ring 8 moves upward, the first spring 16 is in a stretched state, and when the scraper ring 8 is not pushed up, the first spring 16 pulls the scraper ring 8 to reset, so that the scraper ring 8 can move up and down.

[0047] The first spring 16 is sleeved on the cannula 6, and the first spring 16 is located at the bottom of the cannula 6. The scraper ring 8 at the bottom of the cannula 6 is detachably connected to the first spring 16, and the scraper ring 8 is coaxially arranged with the cannula 6. The scraper ring 8 can be pulled in the reverse direction by the first spring 16.

[0048] The top head 18 is arranged on the rotating seat 15, and the top head 18 is arranged vertically on the rotating seat 15. The upper end of the top head 18 is arranged tilted as a whole, and the tilted position of the top head 18 overlaps the top frame 20. The top frame 20 can be pushed by the top head 18, and when the top frame 20 moves up, it will drive the scraper ring 8 to move up. When the top head 18 is away from the top frame 20, the scraper ring 8 can be driven by the first spring 16 to move down.

[0049] The top frame 20 and the top head 18 are arranged in a cross shape as a whole, and the top frame 20 is horizontally arranged on the side seat 19. The side seat 19 is detachably connected to the connecting frame 9, and the top frame 20 and the connecting frame 9 are arranged in a cross shape as a whole. By overlapping the top frame 20 and the top head 18, the top movement of the top head 18 can be achieved.

[0050] like Figure 1-9 As shown, the prevention and control method of water leakage prevention device of subway station in water-rich stratum comprises the following steps:

[0051] S1: During the construction of subway stations, a PVC pipe with a diameter of 4.2 cm is pre-buried at the side wall of the station, about 60 cm to 80 cm above the ground, and the construction height is higher than the waterproof steel plate. The pipe length is less than the wall thickness and 5 cm shorter than the wall thickness. On the one hand, it can prevent groundwater from flowing out of the pre-buried hole, and on the other hand, it can prevent the steel bars from being damaged and the waterproof board from being penetrated during subsequent drilling (penetrating the waterproof board may increase the grouting volume). A PVC pipe of the same size and spacing is also set at about 1 m below the bottom of the middle plate on the top of the wall, and is also higher than the waterproof steel plate at the joint. For details, see Figure 8 ;

[0052] S2: After the reinforcement is tied, press the pre-buried grouting pipe Figure 7 Put it in as shown, wrap the two ends with transparent tape to prevent concrete from pouring into it during pouring. The back side of the pre-buried PVC pipe is flush with the wall surface, and the front side is about 5cm away from the other side of the wall.

[0053] S3: The system grouting is divided into 3 cycles. The next cycle can only be started after the previous cycle is completed. The first grouting flow direction is: from the first negative second floor side wall to the last negative first floor side wall, covering the entire station from bottom to top. The second cycle of grouting is to supplement the grouting of the two rows of grouting holes on the negative first floor. The slurry injected into the last three rows is single-liquid slurry. The ground test found that the solid volume after standing is 50% to 60% of the original slurry volume. The second supplementary grouting is required to increase the filling height of the back slurry. Before the third cycle of grouting, all the closable precipitation wells are closed. At the same time, according to the leakage situation of the station after the previous cycle of grouting, supplementary grouting is carried out for the remaining leakage parts.

[0054] S4: The station system grouting adopts single-liquid cement slurry and double-liquid slurry with a water-cement ratio of 1:1. The cement strength grade should not be lower than 42.5MPa. The bottom row adopts double-liquid grouting, and the upper three rows adopt single-liquid cement slurry. Grouting is carried out on the side walls of the second and first-basement structures; the side walls of the first-basement structure will be grouted after confirming the scope and needs according to the leakage situation of the subsequent stations; grouting will start after the entire station is capped, and the first completed compartments will be grouted first in the order of completion of the station compartments to ensure that the concrete strength meets the requirements. Grouting is carried out from bottom to top, and the interval grouting of the grouting pipe at the bottom is first grouting, and the double-liquid grouting is carried out on the bottom row of grouting holes; the remaining holes are injected with pure cement slurry;

[0055] S5: The preliminary ratio of the double-liquid grouting slurry is shown in Table 1. The specific ratio is determined by the actual on-site test. The following ratio is based on the water-rich formation. In order to ensure that the slurry can solidify in time and have enough time to flow, the ground test is controlled according to the solidification time of 1 minute. If necessary, the ratio can be appropriately adjusted according to the actual on-site situation.

[0056] S6: Grouting of negative second side wall: ① Fig. 9 As shown in the figure, the bottom row of holes is first grouted with double liquid slurry in sequence, the spacing between the pre-buried holes is 5m, and the grouting pressure is not more than 0.5MPa. Fig. 9 As shown, before the construction of each construction section, the reserved holes are first punched and valves are installed; first open hole 1 and hole 2, grouting is performed on hole 1, and at the same time, the valve installed on hole 2 is opened to use it as a drain hole, and the water is forced out with slurry. When the concentration of cement slurry flowing out of hole 2 is close to that of the injected slurry, the valve of hole 2 is closed, and grouting of hole 1 is continued. When the pressure reaches 0.5MPa, the grouting of hole 1 is stopped and the valve of hole 1 is closed; after an interval of 10 minutes, the grouting hole 2 is opened to observe whether there is unsolidified slurry flowing out. If so, the valve is closed and observed every 10 minutes until no slurry flows out, and then double-liquid grouting is performed through hole 2, and the valve of hole 3 is opened in this order; the purpose of injecting double-liquid slurry in the first layer is to prevent the single-liquid slurry injected in the subsequent rows from flowing into the bottom in large quantities and causing cement waste;

[0057] ② After the grouting of the bottom grouting holes in each construction section is completed, the grouting of the second grouting holes is carried out. Fig. 9For the middle grouting holes 5 to 7, starting from the second layer, the injected slurry is pure cement single-liquid slurry; before grouting, an indoor test is carried out, and the injected pure cement slurry is sampled with a measuring cup and left to stand for more than 8 hours. After the cement and water are separated into layers, the proportion of cement solids is recorded; when grouting the second layer of grouting holes, the grouting method is the same as the first row, and before grouting the grouting hole 5, the grouting holes 6, grouting holes 8 and grouting holes 9 are opened, and valves are installed; when the slurry flowing out of the grouting holes 6, grouting holes 8 and grouting holes 9 is close to the injected slurry, the valve is closed; after an interval of 20 hours, grouting is carried out on the grouting hole 6, and the grouting holes 7 and grouting holes 10 are opened at the same time, and the process is carried out in sequence;

[0058] ③ According to the test results, after being stationary, cement particles account for about 50% to 60%. After the slurry solidifies, there is actually no cement slurry at the third row of holes, but water. Therefore, it is necessary to grout the third row of holes in accordance with the grouting method of the second row of holes, and open the grouting holes on the adjacent sides and the top at the same time, and install valves; the condition for the completion of grouting of the third row of holes is that the grouting valves on the sides and the top flow out cement slurry at the same time, and then close the valves, referring to the grouting process of the second row of holes; for the top row of grouting holes, the number of grouting cycles is two; the first grouting stop condition is: slurry flows out of the adjacent holes, and slurry appears on the ground at the same time; after the grouting of the top row of holes is completed, pause for more than 20 hours, and then carry out the second grouting, and the suspension standard is slurry on the ground; grouting hole plugging: cement and organic quick-setting agent plugging materials are used;

[0059] S7: During the grouting process, the engineering team and the engineering department shall check and compare the settlement of the overall posture of the pipeline, buildings and stations every day, and provide real-time feedback on the monitoring data. Once the station body floats or the wall is deformed, the grouting shall be stopped immediately. On the day of grouting, the monitoring points within 15m before and after the grouting position shall be measured. If lifting or other displacement is found, for example, the displacement is greater than 5mm, timely feedback shall be given to the person in charge of the engineering team and engineering department at the work site.

[0060] The above describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited by the above embodiments, and the above embodiments and the specification only describe the principles of the present application. The present application may have various changes and improvements without departing from the spirit and scope of the present application, and these changes and improvements fall within the scope of the present application for which protection is sought. The scope of protection claimed by the present application is defined by the attached claims and their equivalents.

Claims

1. A water leakage prevention device for a subway station in a water-rich stratum, comprising a pump truck (1), a connecting pipe (2), a connecting seat (12), a first handrail (3), a second handrail (17) and a servo motor (11), characterized in that: The first handrail (3) and the second handrail (17) are respectively detachably connected to the two sides of the connecting seat (12); the connecting seat (12) is detachably connected to a servo motor (11); a rotating rod (4) is provided at the output end of the servo motor (11); a cross rod (5) is provided on the rotating rod (4); a pinion (10) is provided on the rotating rod (4); the pinion (10) is meshingly connected with a gear ring (13); a top head (18) is provided at the output end of the gear ring (13); a top frame (20) is overlapped on the top head (18); the top frame (20) is arranged on a scraper ring (8); the scraper ring (8) is sleeved on the insert pipe (6); a discharge port (7) is provided on the insert pipe (6); the discharge port (7) is sequentially provided on the insert pipe (6).

2. The water leakage prevention device for a subway station in a water-rich stratum as claimed in claim 1, characterized in that: The servo motor (11) is arranged on the side of the connecting seat (12); the rotating rod (4) and the insertion tube (6) at the output end of the servo motor (11) are parallel to each other; the rotating rod (4) and the insertion tube (6) are of the same length; and the rotating rod (4) and the cross bar (5) are arranged in a cross shape as a whole.

3. The water leakage prevention device for a subway station in a water-rich stratum as claimed in claim 1, characterized in that: The scraper ring (8) is arranged in a circular ring shape as a whole, and the inner diameter of the scraper ring (8) is the same as the outer diameter of the insert tube (6). The scraper ring (8) outside the insert tube (6) is sleeved on the insert tube (6) in sequence, and a connecting frame (9) is arranged between adjacent scraper rings (8).

4. The water leakage prevention device for a subway station in a water-rich stratum as claimed in claim 1, characterized in that: The connection seat (12) is detachably connected to a base (14), the base (14) being arranged in an annular shape as a whole; the base (14) is rotatably connected to a rotating seat (15), the rotating seat (15) being arranged in an annular shape as a whole.

5. The water leakage prevention device for a subway station in a water-rich stratum as claimed in claim 4, characterized in that: The base (14) and the rotating seat (15) are respectively arranged outside the cannula (6); the base (14), the rotating seat (15) and the cannula (6) are arranged coaxially; and a gear ring (13) is arranged on the rotating seat (15) of the base (14).

6. The water leakage prevention device for a subway station in a water-rich stratum as claimed in claim 1, characterized in that: A first spring (16) is arranged on the connecting seat (12), one end of the first spring (16) is detachably connected to the connecting seat (12), and the other end of the first spring (16) is detachably connected to the scraper ring (8).

7. The water leakage prevention device for a subway station in a water-rich stratum as claimed in claim 6, characterized in that: The first spring (16) is sleeved on the insertion tube (6). The first spring (16) is located at the bottom of the insertion tube (6). The scraper ring (8) at the bottom of the insertion tube (6) is detachably connected to the first spring (16). The scraper ring (8) and the insertion tube (6) are coaxially arranged.

8. The water leakage prevention device for a subway station in a water-rich stratum as claimed in claim 1, characterized in that: The top head (18) is arranged on the rotating seat (15), the top head (18) is arranged vertically on the rotating seat (15), the upper end of the top head (18) is arranged obliquely as a whole, and the inclined position of the top head (18) overlaps the top frame (20).

9. The water leakage prevention device for a subway station in a water-rich stratum as claimed in claim 8, characterized in that: The top frame (20) and the top head (18) are arranged in a cross shape as a whole. The top frame (20) is horizontally arranged on the side seat (19). The side seat (19) is detachably connected to the connecting frame (9). The top frame (20) and the connecting frame (9) are arranged in a cross shape as a whole.

10. A method for preventing and controlling water leakage in a subway station in a water-rich stratum, applied to the prevention and control device according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1: During the construction of the subway station, a PVC pipe with a diameter of 4.2 cm is pre-buried at the side wall of the station, about 60 cm to 80 cm from the ground, and the construction height is higher than the water-stopping steel plate. The pipe length is less than the wall thickness, 5 cm shorter than the wall thickness. A PVC pipe of the same size and spacing is also set at about 1 m below the bottom of the middle plate on the top of the wall, lower than the water-stopping steel plate at the joint; S2: After the steel bars are tied, place the pre-buried grouting pipe as shown in the figure, wrap both ends with transparent tape to prevent concrete from pouring into it during the pouring process. The back soil surface of the pre-buried PVC pipe is flush with the wall surface, and the front soil surface is about 5cm away from the other side of the wall; S3: The system grouting is divided into 3 cycles. The next cycle can only be started after the previous cycle is completed. The first grouting flow direction is: from the first negative second floor side wall to the last negative first floor side wall, covering the entire station from bottom to top. The second cycle of grouting is to supplement the grouting of the two rows of grouting holes on the negative first floor. The slurry injected into the last three rows is single-liquid slurry. The ground test found that the solid volume after standing is 50% to 60% of the original slurry volume. The second supplementary grouting is required to increase the filling height of the back slurry. Before the third cycle of grouting, all the closable precipitation wells are closed. At the same time, according to the leakage situation of the station after the previous cycle of grouting, supplementary grouting is carried out for the remaining leakage parts. S4: The station system grouting adopts single-liquid cement slurry and double-liquid slurry with a water-cement ratio of 1:

1. The cement strength grade should not be lower than 42.5MPa. The bottom row adopts double-liquid grouting, and the upper three rows adopt single-liquid cement slurry. Grouting is carried out on the side walls of the second and first-basement structures; the side walls of the first-basement structure will be grouted after confirming the scope and needs according to the leakage situation of the subsequent stations; grouting will start after the entire station is capped, and the first completed compartments will be grouted first in the order of completion of the station compartments to ensure that the concrete strength meets the requirements. Grouting is carried out from bottom to top, and the interval grouting of the grouting pipe at the bottom is first grouting, and the double-liquid grouting is carried out on the bottom row of grouting holes; the remaining holes are injected with pure cement slurry; S5: The initial ratio of the double-liquid grouting slurry is determined by testing based on the actual situation on site; the following ratio is based on the consideration of water-rich strata. In order to ensure that the slurry can solidify in time and have enough time to flow, the ground test is controlled according to the solidification time of 1 minute. If necessary, the ratio can be appropriately adjusted according to the actual situation on site; S6: Grouting of the negative second side wall: First, grout the bottom row of holes with double liquid slurry in sequence. The spacing between the pre-buried holes is 5m, and the grouting pressure is not more than 0.5MPa. Before the construction of each construction section, the reserved holes are first pierced and valves are installed; first open hole 1 and hole 2, grout hole 1, and open the valve installed in hole 2 at the same time, use it as a drain hole, and use the slurry to force the water out. When the concentration of cement slurry flowing out of hole 2 is close to that of the injected cement slurry, close the valve of hole 2, and continue grouting in hole 1 at the same time. When the pressure reaches 0.5MPa, stop grouting in hole 1 and close the valve of hole 1; after an interval of 10 minutes, open grouting hole 2 to observe whether there is unsolidified slurry flowing out. If so, close the valve and observe every 10 minutes until no slurry flows out, then perform double liquid grouting through hole 2, and open the valve of hole 3 at the same time, and carry out in this order; the purpose of injecting double liquid slurry in the first layer is to prevent the single liquid slurry injected in the subsequent rows from flowing into the bottom in large quantities and causing cement waste; ② After the grouting of the bottom grouting holes of each construction section is completed, the grouting of the second layer of grouting holes is carried out. For grouting holes 5 to 7, starting from the second layer, the slurry injected is pure cement single liquid slurry; before grouting, an indoor test is carried out, and the injected pure cement slurry is sampled with a measuring cup and left to stand for more than 8 hours. After the cement and water are separated, the proportion of cement solids is recorded; when grouting the second layer of grouting holes, the grouting method is the same as the first row, and before grouting grouting hole 5, grouting holes 6, grouting holes 8 and grouting holes 9 are opened, and valves are installed; when the slurry flowing out of grouting holes 6, grouting holes 8 and grouting holes 9 is close to the injected slurry, the valve is closed; after an interval of 20 hours, grouting hole 6 is grouted, and grouting holes 7 and grouting holes 10 are opened at the same time, and the process is carried out in sequence; ③ According to the test results, after being stationary, cement particles account for about 50% to 60%. After the slurry solidifies, there is actually no cement slurry at the third row of holes, but water. Therefore, it is necessary to grout the third row of holes in accordance with the grouting method of the second row of holes, and open the grouting holes on the adjacent sides and the top at the same time, and install valves; the condition for the completion of grouting of the third row of holes is that the grouting valves on the sides and the top flow out cement slurry at the same time, and then close the valves, referring to the grouting process of the second row of holes; for the top row of grouting holes, the number of grouting cycles is two; the first grouting stop condition is: slurry flows out of the adjacent holes, and slurry appears on the ground at the same time; after the grouting of the top row of holes is completed, pause for more than 20 hours, and then carry out the second grouting, and the suspension standard is slurry on the ground; grouting hole plugging: cement and organic quick-setting agent plugging materials are used; S7: During the grouting process, the engineering team and the engineering department shall check and compare the settlement of the overall posture of the pipeline, buildings and stations every day, and provide real-time feedback on the monitoring data. Once the station body floats or the wall is deformed, the grouting shall be stopped immediately. On the day of grouting, the monitoring points within 15m before and after the grouting position shall be measured. If lifting or other displacement is found, for example, the displacement is greater than 5mm, timely feedback shall be given to the person in charge of the engineering team and engineering department at the work site.

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