A repair method and device for an anti-floating structure with a raised bottom plate

Abstract

The invention discloses a method and device for repairing an anti-floating structure with a raised floor slab, including a permeable steel casing, a drilling rig, and a reaction frame. The permeable steel casing is provided with a permeable steel casing window and permeable holes. The bottom of the drilling rig is provided with a base, and the drilling rig can be installed inside the permeable steel casing through the base. A turntable is arranged on the base. The high-pressure jet soil extraction rod on the drilling rig of the invention can rotate 360°. The high-pressure water ejected makes the soil raised under the floor slab into slurry and discharges it into the permeable steel casing, and is pumped out of the ground by a slurry pump. After the raised area of the floor slab is emptied, it can be restored to its original position by applying pressure with a jack. The invention replaces the slurry with cement slurry to form a new bearing layer for the floor slab after reinforcement. The invention transforms the permeable steel casing for soil extraction into a dewatering well, and through the linkage of an automatic water level gauge and a water pump, the groundwater level is always controlled below the bottom surface of the basement floor slab, solving the problem that the anti-floating structure is damaged and fails again due to the sudden rise of the groundwater level in extreme weather for the basement floor slab.

Description

Technical Field

[0001] The invention belongs to the technical field of anti-floating of underground engineering, and in particular relates to a method and a device for repairing an anti-floating structure with a raised bottom plate. Background Art

[0002] The anti-floating design of urban buildings and underground projects involves the game between the anti-floating safety factor and the construction cost. The determination of the anti-floating defense water level, an important design parameter that affects the anti-floating safety, is a difficult problem that currently plagues the engineering community. Due to the uncertainty of the groundwater level, frequent extreme weather disasters, and frequent floods above the warning level in rivers and lakes, the groundwater level rises sharply. When the groundwater level exceeds the basement defense water level, basement floor floating accidents are likely to occur.

[0003] When a basement floor floats up, the basement and the upper structure may have been partially or completely completed. The basement floor bulges and cracks due to the floating, and the foundation soil bulges along with it. If the bulged foundation soil is not removed, the floating floor cannot be restored to its original position. Existing repair devices are difficult to remove the bulged foundation soil, making it difficult to repair the cracks and prevent the floor from floating up again. Therefore, we propose a method and device for repairing an anti-floating structure with a bulged floor. Summary of the invention

[0004] In view of the problems existing in the prior art, the purpose of the present invention is to provide a method and device for repairing an anti-floating structure with a raised base plate, by drilling holes at the locations where cracks and raised base plates are formed, installing permeable steel casings, and using horizontal high-pressure jet soil drilling rods to spray high-pressure water to make mud from the raised soil under the base plate and drain it away. After all the loose soil is removed, a hollow area is formed, and a reaction frame and a jack are used to restore the raised area of ​​the base plate to its original position, and structural adhesive is poured into the cracks to repair the basement base plate. After the basement base plate is reset, cement slurry is poured into the remaining hollow area to replace the mud. Through the automatic drainage system of the precipitation well transformed from the permeable steel casing, the groundwater level is controlled below the bottom of the basement base plate, thereby realizing the repair of the basement basement base plate.

[0005] The present invention is achieved as follows: a device for repairing an anti-floating structure with a raised bottom plate comprises a permeable steel casing, a drilling rig and a reaction frame, wherein the permeable steel casing is provided with a permeable steel casing window and a water-permeable hole, a base is provided at the bottom of the drilling rig, the drilling rig can be installed inside the permeable steel casing through the base, a turntable is provided on the base, the base and the turntable are connected by a bearing, a high-pressure jet soil drilling rod is provided on the drilling rig, the reaction frame is fixed to the surrounding basement columns by a clamp, a jack is provided on the reaction frame, the jack applies pressure to the hollowed area of ​​the raised basement bottom plate, so that the basement bottom plate can be restored to its original position.

[0006] Optionally, the upper part of the permeable steel casing is impermeable. The window of the permeable steel casing is opened at the middle position of the permeable steel casing, and the permeable holes are opened at the lower position of the permeable steel casing. The permeable holes are arranged in a plum blossom pattern, and the bottom end of the permeable steel casing is an open structure.

[0007] Optionally, a diesel generator is provided on the top of the turntable. The diesel generator is connected to the high-pressure jet soil extraction drill pipe through a transmission device. The transmission device includes a drill pipe gripper and a guide rail. The drill pipe gripper is arranged outside the high-pressure jet soil extraction drill pipe, and the high-pressure jet soil extraction drill pipe is slidably connected to the guide rail.

[0008] Optionally, a spiral blade drill bit is installed at the head of the high-pressure jet soil extraction drill pipe. The top of the spiral blade drill bit is a cone, and a nozzle is provided. Nozzles are also provided around the high-pressure jet soil extraction drill pipe.

[0009] Optionally, a steel corbel is installed above the hoop clip, and the jack is installed at the bottom of the reaction frame.

[0010] Optionally, an inner cylinder is arranged inside the permeable steel casing. Gradation gravel is arranged between the permeable steel casing and the inner cylinder. The permeable steel casing, the inner cylinder and the gradation gravel form a precipitation well composite structure. A water pump, a drain pipe, an automatic water level gauge and a steel manhole cover are installed inside the inner cylinder to form a drainage automatic control system.

[0011] Optionally, the sensor of the automatic water level gauge in the drainage automatic control system is buried at a position below the waterproof layer at the bottom surface of the basement floor. The automatic water level gauge is electrically connected to the water pump.

[0012] Optionally, a method for repairing the anti-floating structure with the floor heaving includes the following steps:

[0013] S1. Determine the position of the hole to be chiseled on the basement floor, break the floor concrete, install the permeable steel casing, take soil and sink the permeable steel casing;

[0014] S2. Install a drilling rig inside the permeable steel casing. Align the high-pressure jet soil extraction drill pipe with the window of the permeable steel casing, rotate horizontally and spray high-pressure water to make the soil into slurry and discharge it to form an emptied area;

[0015] S3. Install the reaction frame, and use the jack to pressurize the emptied area where the basement floor heaves, so that the basement floor returns to its original position;

[0016] S4. Open a chiseled groove along the floor crack, and open an inclined drill hole on the side of the chiseled groove to penetrate deep into the floor crack. Then pour structural adhesive into the inclined drill hole for sealing. Place a water stop strip in the chiseled groove, and then seal it with waterproof mortar;

[0017] S5. Close the permeable steel casing window with a window sealing plate, weld an external threaded pipe through the reserved grouting hole, insert a grouting pipe, and pour cement slurry into the remaining hollow area after the basement floor is reset to replace the slurry and form a new foundation bearing stratum.

[0018] S6. Transform the permeable steel casing for soil extraction into a composite structure of a dewatering well, and install a drainage automatic control system in the composite structure of the dewatering well.

[0019] S7. Repair the broken basement floor at the location of the permeable steel casing.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0021] 1. A rotatable turntable is installed on the drilling rig base of the present invention, enabling the high-pressure jet soil extraction rod to rotate 360°. The high-pressure water ejected makes the uplifted soil under the floor into slurry and discharges it into the permeable steel casing, and is pumped out of the ground by a slurry pump. After the uplifted area of the floor is hollowed out, it can be restored to its original position by applying pressure with a jack.

[0022] 2. The present invention replaces the slurry with cement slurry to form a new bearing stratum for the floor after reinforcement.

[0023] 3. The present invention transforms the permeable steel casing for soil extraction into a dewatering well, and through the linkage of an automatic water level gauge and a water pump, the groundwater level is always controlled below the bottom surface of the basement floor, solving the problem that the anti-floating structure is damaged and fails again due to the sudden rise of the groundwater level in extreme weather for the basement floor.

[0024] Through the following detailed description of the exemplary embodiments of the present invention with reference to the accompanying drawings, other features and advantages of the present invention will become clear. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a schematic diagram of the uplift, cracking and water gushing of the basement floor provided by the present invention;

[0026] Figure 2 is a schematic diagram of soil extraction and slurry making under the basement floor provided by the present invention;

[0027] Figure 3 is a schematic diagram of the structure of the permeable steel casing provided by the present invention;

[0028] Figure 4 is a partial structural schematic diagram of the high-pressure jet soil extraction drill rod provided by the present invention;

[0029] Figure 5 is a schematic diagram of the coverage range of the high-pressure jet soil extraction drill rod at one window provided by the present invention;

[0030] Figure 6 is a schematic diagram of the reaction frame applying pressure to reset the floor;

[0031] Figure 7 is Figure 6 The partial enlarged structural schematic diagram at position A in

[0032] Figure 8 is the schematic diagram of closing the window of the permeable steel casing with a steel plate provided by the present invention;

[0033] Figure 9 is the schematic diagram of grouting cement slurry to replace mud in the hollowed area under the basement floor provided by the present invention;

[0034] Figure 10 is the schematic diagram of sealing the hole by grouting cement slurry in the hollowed area under the basement floor provided by the present invention;

[0035] Figure 11 is the schematic diagram of the connection structure between the dewatering well and the basement floor provided by the present invention;

[0036] Figure 12 is Figure 11 the partial enlarged structural schematic diagram at position B in

[0037] Figure 13 is the structural schematic diagram of the high-pressure jet soil extraction drill pipe and the drill rig provided by the present invention.

[0038] In the figure: 1. Basement floor; 101. Floor concrete; 102. Grouting layer; 103. Floor longitudinal reinforcement; 104. Floor transverse reinforcement; 105. Welding point; 106. Hole-sealing concrete; 107. Waterproof layer; 2. Engineering pile; 201. Cap; 202. Basement column; 3. Water gushing point; 301. Floor crack; 302. Grooving; 303. Inclined drilling hole; 304. Waterstop strip; 305. Waterproof mortar; 4. Permeable steel casing; 401. Permeable hole; 402. Steel strip; 403. Window of the permeable steel casing; 404. Wall of the permeable steel casing; 405. Mud; 406. Screw hole; 407. Screw; 408. Window sealing plate; 409. Grouting hole; 5. Drill rig; 501. Base; 502. Turntable; 503. High-pressure jet soil extraction drill pipe; 504. Nozzle; 505. Helical blade drill bit; 506. Diesel generator; 507. Transmission device; 508. Drill pipe gripper; 509. Guide rail; 6. Inner cylinder; 601. Inner cylinder permeable hole; 602. Water pump; 603. Drain pipe; 604. Steel manhole cover; 605. Gradation gravel; 606. Waterproof steel plate; 607. Automatic water level gauge; 7. Reaction frame; 701. Jack; 702. Clamping hoop; 703. Steel corbel; 8. Grouting pipe; 801. External threaded pipe; 802. Nut cover. Detailed implementation manners

[0039] In order to further understand the content, features and effects of the present invention, the following embodiments are exemplified and described in detail with reference to the accompanying drawings as follows.

[0040] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention.

[0041] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way a limitation on the present invention or its application or use.

[0042] Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such technologies, methods, and devices should be regarded as part of the specification.

[0043] In all the examples shown and discussed herein, any specific values should be construed as merely exemplary and not as a limitation. Thus, other examples of the exemplary embodiments may have different values.

[0044] The structure of the present invention will be described in detail below with reference to the accompanying drawings.

[0045] As Figures 1 to 13 shown, a repair device for an anti-floating structure with a raised basement floor provided by an embodiment of the present invention includes a permeable steel casing 4, a drilling rig 5, and a reaction frame 7. A permeable steel casing window 403 and permeable holes 401 are provided on the permeable steel casing 4. A base 501 is provided at the bottom of the drilling rig 5. The drilling rig 5 can be installed inside the permeable steel casing 4 through the base 501. A turntable 502 is provided on the base 501. The base 501 and the turntable 502 are connected by a bearing. A high-pressure jet soil extraction drill pipe 503 is provided on the drilling rig 5. The reaction frame 7 is fixed to the surrounding basement columns 202 by a hoop clamp 702. A jack 701 is provided on the reaction frame 7. The jack 701 pressurizes the hollowed area where the basement floor 1 bulges, so that the basement floor 1 can be restored to its original position.

[0046] Furthermore, the upper part of the permeable steel casing 4 is impermeable. The permeable steel casing window 403 is opened at the middle position of the permeable steel casing 4. The permeable holes 401 are opened at the lower position of the permeable steel casing 4, and the permeable holes 401 are arranged in a plum blossom shape. The bottom end of the permeable steel casing 4 is an open structure.

[0047] The permeable steel casing 4 is installed at the highest bulging part of the basement floor 1. The top surface of the permeable steel casing 4 is driven into the bottom surface of the basement floor 1. The diameter of the permeable steel casing 4 is more than 2.5 m, which is convenient for the drill rig 5 to operate inside. At least six permeable steel casing windows 403 are arranged in the middle of the permeable steel casing 4 for the high-pressure jet soil extraction drill pipe 503 to extract soil below the bulge of the basement floor 1 through the permeable steel casing windows 403 to make slurry 405. The preferred diameter of the plum blossom-shaped permeable holes 401 at the lower part of the permeable steel casing 4 is 1.0 mm - 3.0 mm, and the spacing is 10 mm - 20 mm.

[0048] Further, a diesel generator 506 is arranged on the top of the turntable 502. The diesel generator 506 is connected with the high-pressure jet soil extraction drill pipe 503 through a transmission device 507. The transmission device 507 includes a drill pipe gripper 508 and a guide rail 509. The drill pipe gripper 508 is arranged outside the high-pressure jet soil extraction drill pipe 503, and the high-pressure jet soil extraction drill pipe 503 is slidably connected to the guide rail 509.

[0049] The transmission device 507 of the diesel generator 506 drives the high-pressure jet soil extraction drill pipe 503 to rotate and drill. When drilling, the drill pipe gripper 508 locks the high-pressure jet soil extraction drill pipe 503 to transmit pressure to the high-pressure jet soil extraction drill pipe 503. The high-pressure jet soil extraction drill pipe 503 drills along the guide rail 509. When stopping, the drill pipe gripper 508 is loosened, and the high-pressure jet soil extraction drill pipe 503 is taken out. After the base 501 is leveled, it is fixed and immovable, and the turntable 502 can rotate horizontally 360°.

[0050] Further, a spiral blade drill bit 505 is installed at the head of the high-pressure jet soil extraction drill pipe 503. The top of the spiral blade drill bit 505 is a cone, and a nozzle 504 is arranged. There are at least three spiral blades on the spiral blade drill bit 505, and nozzles 504 are also arranged around the high-pressure jet soil extraction drill pipe 503.

[0051] When drilling, the high-pressure jet soil extraction drill pipe 503 rotates and sprays high-pressure water flow to cut the soil into slurry 405, which is discharged into the permeable steel casing 4 and pumped away by a slurry pump. Specifically, the fan-shaped angle of the high-pressure jet soil extraction drill pipe 503 rotating in one permeable steel casing window 403 is 65° - 75°, and the adjacent window fan-shaped areas overlap by 5° - 10°. When the high-pressure jet soil extraction drill pipe 503 rotates around the permeable steel casing 4 for one circle, the area of the bulging soil under the basement floor 1 processed is a circular area with the high-pressure jet soil extraction drill pipe 503 as the radius.

[0052] Further, the two channel-shaped steel plates of the hoop clamp 702 are placed on both sides of the basement column 202 and are pressed by fastening bolts. A steel corbel 703 is installed above the hoop clamp 702, and the jack 701 is installed at the bottom of the reaction frame 7.

[0053] Determine the number of jacks 701 according to the area of the basement floor 1 enclosed by the adjacent four engineering piles 2 and the basement columns 202 connected to the pile cap 201. The controlled area of one jack 701 is not less than one square meter.

[0054] Further, an inner cylinder 6 is arranged inside the permeable steel casing 4, graded broken stones 605 are arranged between the permeable steel casing 4 and the inner cylinder 6, and the permeable steel casing 4, the inner cylinder 6 and the graded broken stones 605 form a precipitation well composite structure. A water pump 602, a drain pipe 603, an automatic water level gauge 607 and a steel manhole cover 604 are installed inside the inner cylinder 6 to form a drainage automatic control system.

[0055] Inner cylinder water permeable holes 601 are arranged on the inner cylinder 6. The inner cylinder 6 is arranged in the permeable steel casing wall 404. The diameter of the inner cylinder 6 is not less than 1 / 5 of that of the permeable steel casing 4. The inner cylinder 6 is a bottom-closed structure, welded with a perforated steel plate, and a water stop steel plate 606 is welded around the outer wall of the inner cylinder 6. The part below the water stop steel plate 606 is processed into a slotted pipe and wrapped with two layers of filter screens.

[0056] Further, the sensor of the automatic water level gauge 607 in the drainage automatic control system is buried at a position below the bottom waterproof layer 107 of the basement floor 1, and the automatic water level gauge 607 is electrically connected to the water pump 602. When the sensor of the automatic water level gauge 607 is immersed in water, the circuit is turned on, and the water pump 602 will be started to drain water. When the sensor of the automatic water level gauge 607 is higher than the groundwater level, the circuit is disconnected to realize the automatic control operation of the water pump 602.

[0057] Further, the present invention provides a method for repairing the anti-floating structure with the basement floor heaving, including the following steps:

[0058] S1. Determine the position of the hole to be drilled in the basement floor 1, break the floor concrete 101, install the permeable steel casing 4, and take soil and sink the permeable steel casing 4;

[0059] S2. Install a drilling rig 5 inside the permeable steel casing 4, horizontally rotate and drill the high-pressure jet soil-taking drill rod 503 to align with the permeable steel casing window 403 and spray high-pressure water, and discharge the soil into slurry 405 to form a hollowed-out area;

[0060] S3. Install a reaction frame 7, and use the jack 701 to pressurize the hollowed-out area where the basement floor 1 heaves, so that the basement floor 1 returns to its original position;

[0061] S4. Open a grooving 302 along the floor crack 301 at the water gushing point 3, and open an inclined drilling hole 303 on the side of the grooving 302 to penetrate deep into the floor crack 301, then pour structural adhesive into the inclined drilling hole 303 for sealing, place a water stop strip 304 in the grooving 302, and then seal it with waterproof mortar 305;

[0062] S5. Use the window seal plate 408 to seal the window 403 of the permeable steel casing. Weld the external threaded pipe 801 through the reserved grouting hole 409, insert the grouting pipe 8, and pour cement slurry into the remaining hollow area after the basement floor 1 is reset to replace the slurry 405 to form a new foundation bearing stratum.

[0063] S6. Transform the permeable steel casing 4 for soil extraction into a composite structure of a dewatering well, and install a drainage automatic control system in the composite structure of the dewatering well.

[0064] S7. Repair the broken basement floor 1 at the location of the permeable steel casing 4.

[0065] Specifically, in step S4, a grooving 302 is opened along the trend of the floor crack 301. The grooving length is not shorter than the crack length, and the grooving depth is 0.1 m - 0.3 m. Oblique drilling holes 303 are opened at a distance of 0.2 m - 0.5 m from the side of the crack. The number of drilling holes is determined according to the crack length. Structural adhesive is poured into the crack, a water stop strip 304 is placed on the bottom surface of the grooving 302, and then waterproof mortar 305 is poured to seal it.

[0066] Specifically, in step S5, after the uplifted soil under the basement floor 1 is made into slurry 405 and drained away, all the loose soil is removed to form a hollow area. Then, use the window seal plate 408 to block the window 403 of the permeable steel casing. Use screws 407 to fix the window seal plate 408 on the steel strip 402 through the screw holes 406. Reserve a grouting hole 409 on the window seal plate 408. Weld the external threaded pipe 801 to the grouting hole 409. Insert the grouting pipe 8 into the hollow area of the basement floor 1, pour cement slurry from the inside to the outside to form a grouting layer 102 to replace the slurry 405, and finally tighten the external threaded pipe 801 with a nut cap 802 to block the grouting hole 409.

[0067] Specifically, in step S7, when repairing the broken basement floor 1, weld the bottom longitudinal bars 103 and bottom transverse bars 104 of the basement floor 1 to the inner cylinder 6 through the welding points 105 and weld them to the steel bars on the original basement floor 1. Apply an interface agent to the old concrete interface, lay a waterproof layer 107 on the cushion layer, pour and cure the hole-sealing concrete 106 to complete the repair of the basement floor 1.

[0068] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or device.

[0069] Although embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for repairing an anti-floating structure with a raised bottom plate, using a repair device, the repair device comprising a permeable steel casing (4), a drilling rig (5) and a reaction frame (7), the permeable steel casing (4) being provided with a permeable steel casing window (403) and a permeable hole (401), a base (501) being provided at the bottom of the drilling rig (5), the drilling rig (5) being installed inside the permeable steel casing (4) through the base (501), a turntable (502) being provided on the base (501), the base (501) and the turntable (502) being connected via a bearing, a high-pressure jet soil drilling rod (503) being provided on the drilling rig (5), the reaction frame (7) being fixed to surrounding basement columns (202) by clamps (702), and a jack (701) being provided on the reaction frame (7), characterized in that: The steps include: S1, determine the location of the hole for the basement floor (1), break the floor concrete (101), install the permeable steel casing (4), take soil and sink the permeable steel casing (4); S2, installing a drilling rig (5) in the permeable steel casing (4), aiming a high-pressure jet soil extraction drill rod (503) at the window (403) of the permeable steel casing, drilling horizontally and spraying high-pressure water, and turning the soil into mud (405) and discharging it to form a hollowing area; S3, installing the reaction frame (7), and using the jack (701) to apply pressure to the hollowed-out area of ​​the raised basement floor (1), so that the basement floor (1) returns to its original position; S4, a chisel groove (302) is opened along the bottom plate crack (301), and an oblique drill hole (303) is opened on the side of the chisel groove (302) to penetrate the deep part of the bottom plate crack (301), and then a structural adhesive is poured into the oblique drill hole (303) to seal it, and a water stop strip (304) is placed in the chisel groove (302), and then it is sealed with waterproof mortar (305); S5. Use a window sealing plate (408) to seal the permeable steel casing window (403), reserve a grouting hole (409) on the window sealing plate (408), weld an external threaded pipe (801) through the reserved grouting hole (409), insert a grouting pipe (8), and pour cement slurry into the remaining hollowed-out area after the basement floor (1) is reset, so as to replace the slurry (405) and form a new foundation bearing layer; S6, transforming the permeable steel casing (4) used for soil extraction into a drainage well composite structure, and installing a drainage automatic control system in the drainage well composite structure; S7. Repair the damaged basement floor (1) at the permeable steel casing (4).

2. The method for repairing an anti-floating structure with raised bottom plate according to claim 1, characterized in that: The upper portion of the water-permeable steel casing (4) is water-impermeable, the water-permeable steel casing window (403) is provided at the middle position of the water-permeable steel casing (4), the water-permeable holes (401) are provided at the lower position of the water-permeable steel casing (4), and the water-permeable holes (401) are arranged in a plum blossom shape, and the bottom end of the water-permeable steel casing (4) is an open structure.

3. The method for repairing an anti-floating structure with raised bottom plate according to claim 1, characterized in that: A diesel generator (506) is arranged on the top of the rotating disk (502), and the diesel generator (506) is connected to the high-pressure jet soil drilling rod (503) via a transmission device (507).

4. The method for repairing an anti-floating structure with raised bottom plate according to claim 1, characterized in that: A spiral blade drill bit (505) is installed at the head of the high-pressure jet soil drilling rod (503); the top of the spiral blade drill bit (505) is a cone and is provided with a nozzle (504); nozzles (504) are also provided around the high-pressure jet soil drilling rod (503).

5. The method for repairing an anti-floating structure with raised bottom plate according to claim 1, characterized in that: A steel bracket (703) is installed above the clamp (702), and the jack (701) is installed at the bottom of the reaction frame (7).

6. The method for repairing an anti-floating structure with raised bottom plate according to claim 1, characterized in that: An inner tube (6) is arranged inside the permeable steel casing (4), and graded crushed stone (605) is arranged between the permeable steel casing (4) and the inner tube (6). The permeable steel casing (4), the inner tube (6) and the graded crushed stone (605) form a precipitation well composite structure, and a water pump (602), a drainage pipe (603), an automatic water level gauge (607) and a steel well cover (604) are installed inside the inner tube (6), forming a drainage automatic control system.

7. A method for repairing an anti-floating structure with raised bottom plate according to claim 6, characterized in that: The sensor of the automatic water level meter (607) in the drainage automatic control system is buried below the waterproof layer (107) on the bottom surface of the basement floor (1), and the automatic water level meter (607) is electrically connected to the water pump (602).

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