A method for quickly plugging a basement raft dewatering well and pipeline

Abstract

This invention relates to the field of basement dewatering well sealing technology, aiming to solve the problems of traditional basement dewatering well sealing methods, such as difficulty in meeting pressure requirements, easy sealing failure, difficulty in ensuring weld density in water-bearing environments, easy damage to raft slab main reinforcement and surrounding waterproofing structures, equipment waste due to submersible pumps left in the well, easy disintegration of cement grout before initial setting, and the need for repeated grouting repairs for single wells. The invention provides a rapid sealing method for basement raft slab dewatering wells and pipes, including: S1: BIM-based detailed positioning; S2: prefabrication of water-stop steel sleeves, perforated blind flanges, and petal-shaped umbrella-shaped sealing devices; S3: on-site pre-embedding of water-stop steel sleeves; S4: sequential construction of the base slab cushion layer, waterproof layer, and raft slab main body; S5: temporary dewatering; S6: lowering the petal-shaped umbrella-shaped sealing device into the dewatering well; S7: composite sealing within the water-stop steel sleeve; S8: installation of perforated blind flanges; S9: sealing of pre-reserved holes in the raft slab main body. This invention provides good sealing effect and meets pressure requirements.

Description

Technical Field

[0001] This invention relates to the field of sealing technology for basement dewatering wells, and more specifically, to a method for quickly sealing basement raft slab dewatering wells and pipes. Background Technology

[0002] Currently, the sealing of basement raft slab dewatering wells commonly employs techniques such as gravity backfilling with sand and gravel, sealing with blind flanges while the water is still wet, and sealing with single cement grouting.

[0003] Gravity backfilling of sand and gravel relies on layered filling and compaction of sand and gravel to seal the well. It is only suitable for ordinary dewatering wells with low water inflow and low groundwater pressure. Under the action of pressurized water, sand and gravel are easily eroded and hollowed out by water flow, forming seepage channels. The probability of sealing failure is high, and subsequent leakage and repair are frequent. Therefore, it is difficult to meet the requirements of high water level deep foundation pit projects, and its use under high pressure conditions is gradually decreasing at present.

[0004] While wet welding of blind flanges is widely used in engineering applications, the rapid rise of pressurized groundwater after pump shutdown results in a very short window for effective well sealing. Weld density in wet environments is difficult to guarantee, and the construction process can easily damage the main reinforcing bars of the raft slab and the surrounding waterproof structure. Furthermore, the submersible pump must be permanently left in the well, resulting in equipment waste. The cost per well is relatively high, and construction hazards are prominent in densely populated well areas.

[0005] In addition, for traditional single cement grouting sealing, the grout is easily dispersed and diluted by high-speed pressurized water flow before it sets. Single wells often need repeated grouting repairs. Multiple drilling and grouting can easily damage the original concrete structure and waterproofing system of the raft slab, resulting in permanent weak leakage zones. Summary of the Invention

[0006] This invention aims to provide a rapid sealing method for basement raft slab dewatering wells and pipes, solving the problems of traditional basement dewatering well sealing methods, such as difficulty in meeting pressure requirements, easy sealing failure, difficulty in ensuring weld density in water-bearing environments, easy damage to the main reinforcement of the raft slab and surrounding waterproof structures, equipment waste due to the placement of submersible pumps in the well, easy dispersion and dilution of cement grout before initial setting by high-speed pressurized water flow, and the need for repeated grouting repairs for a single well.

[0007] This invention is achieved using the following technical solution: This invention provides a method for rapid sealing of basement raft slab dewatering wells and pipes, comprising the following steps: S1: BIM-based detailed positioning; S2: Prefabricated water-stopping steel sleeve, perforated blind flange and petal-shaped umbrella-shaped sealing device; S3: Pre-embedded water-stop steel sleeve on site; S4: Construct the base slab, waterproof layer, and raft slab in sequence; S5: Temporary precipitation; S6: Lower the petal-shaped umbrella-shaped sealing device into the dewatering well; S7: Composite sealing inside the water-stop steel sleeve; S8: Install a blind flange with holes; S9: Seal the pre-reserved holes in the main body of the raft.

[0008] As a preferred technical solution: Step S1 specifically includes: By using BIM parametric modeling, structural, waterproofing, and dewatering models are integrated to form a multi-disciplinary integrated model. Based on the multi-disciplinary integrated model, the pre-embedded coordinates and elevations of the water-stop steel sleeve are marked; Based on the pre-embedded coordinates and elevation of the water-stop steel casing, optimize the layout path of the main reinforcement of the raft slab around the well location, avoid collision between the water-stop steel casing and the main reinforcement of the raft slab, and output the detailed pre-embedded construction drawings of the water-stop steel casing.

[0009] As a preferred technical solution: In step S2: The water-stop steel sleeve has flanges at both ends, namely the upper flange and the lower flange; A positioning steel sleeve is fixed on the outer edge of the lower flange of the water-stop steel sleeve. The diameter of the positioning steel sleeve is larger than that of the water-stop steel sleeve. The positioning steel sleeve and the water-stop steel sleeve are integrally formed. A water-stop wing ring is fixed on the outer wall of the water-stop steel sleeve; The perforated blind flange is used to install on the upper end of the water-stop steel sleeve. The perforated blind flange has a hole in the middle for the main tie rod of the petal-shaped umbrella-shaped sealing device to pass through. The petal-shaped umbrella-shaped sealing device includes a bottom plate, a waterproof cloth, an annular water-swellable sealing strip, and multiple fan-shaped plates; The bottom plate is a circular plate, and multiple sector plates are arranged around the bottom plate. All the sector plates form a ring structure around the bottom plate, and each sector plate is rotatably connected to the bottom plate. Each sector panel can be rotated from the unfolded position to the folded position. The unfolded position is when the sector panel and the bottom panel are on the same plane. The waterproof fabric is wrapped around the bottom of the bottom panel and all the fan-shaped panels. The seam of the waterproof fabric is set on the top surface of the fan-shaped panels. The waterproof fabric can seal the gaps between adjacent fan-shaped panels and the gaps between the fan-shaped panels and the bottom panel. The top surface of the ring structure formed by all the fan-shaped plates is equipped with a ring-shaped water-swellable sealing strip, which is installed at the end of the waterproof cloth. A main tie rod is fixed in the middle of the top surface of the bottom plate, and a water-stop ring is fixed to the rod of the main tie rod; Each sector panel has a lifting lug fixed to its top surface. A sliding ring is slidably fitted on the main tie rod. A diagonal tie rod is hinged between each lifting lug and the sliding ring. The sliding ring slides from bottom to top on the main tie rod, allowing all sector panels to rotate from the unfolded position to the retracted position.

[0010] As a preferred technical solution: Step S3 specifically includes: According to the detailed construction drawings of the pre-embedded water-stop steel sleeve in step S1, the water-stop steel sleeve is placed in the design position. The water-stop steel sleeve is positioned by cooperating with the concrete pipe of the dewatering well.

[0011] As a preferred technical solution: In step S2, each sector plate can rotate from a first position that is on the same plane as the bottom plate to a second position that is perpendicular to the bottom plate. The sector plate is in an unfolded state when it is in the first position and in a folded state when it is in the second position. In step S3, the positioning steel sleeve is fitted over the outside of the dewatering well concrete pipe, and the lower flange of the water-stop steel sleeve is supported on the upper end of the dewatering well concrete pipe to position the water-stop steel sleeve.

[0012] As a preferred technical solution: The second position is not limited to the position where the fan-shaped plate and the bottom plate are perpendicular. It can also be the position where the angle between the two is acute or obtuse, but the perpendicularity of the two is the preferred method.

[0013] As a preferred technical solution: Step S4 specifically includes: After the foundation slab cushion concrete is poured and formed, waterproof membrane is laid on the outer wall of the water-stop steel sleeve below the water-stop ring and on the foundation slab cushion to form a waterproof layer. The lower flange of the water-stop steel sleeve is flush with the foundation slab. The raft slab body concrete is poured above the foundation slab cushion. The water-stop steel sleeve is pre-embedded in the raft slab body. A raft slab body hole is reserved at the top of the raft slab body, and the upper part of the water-stop steel sleeve is located in the raft slab body hole.

[0014] As a preferred technical solution: Step S5 specifically includes: Stop dewatering from the dewatering wells, retrieve the dewatering pumps inside the wells, and simultaneously use self-priming pumps to temporarily dewater the wells to prevent groundwater from gushing to the surface. The self-priming pumps are placed on the ground.

[0015] As a preferred technical solution: Step S6 specifically includes: Before lowering the petal-shaped umbrella-shaped sealing device, manually pull the sliding ring on the ground to make it slide from bottom to top on the main pull rod, so that the fan-shaped plate reaches the closed state; Then, holding the main pull rod, vertically lower the petal-shaped umbrella-shaped sealing device from the top of the water-stop steel casing into the dewatering well; When the petal-shaped umbrella-shaped sealing device is lowered to the predetermined sealing position in the dewatering well, the sliding ring is pushed down with the help of a tool, causing it to slide down on the main tie rod. Each sector plate gradually unfolds in the dewatering well until it reaches the unfolded state. The sector plates and the bottom sealing plate together form a circular sealing skeleton. The waterproof cloth seals the gaps between adjacent sector plates and the gaps between sector plates and the bottom sealing plate. The sector plates, the bottom sealing plate, and the waterproof cloth together form a complete circular pressure-bearing sealing structure, which has a complete circular pressure-bearing sealing surface. The upward-pulling petal-shaped umbrella-shaped sealing device makes the annular water-swellable waterstop strip on the top surface of the fan-shaped plate contact the bottom surface of the lower flange of the waterstop steel sleeve. The waterstop steel sleeve, the annular water-swellable waterstop strip, the fan-shaped plate, the bottom sealing plate, and the waterproof cloth form a composite waterstop structure. The waterstop strip expands when it comes into contact with water and automatically fills the gaps, forming a water pressure self-tightening sealing structure, realizing water stoppage and seepage prevention in the well and water pressure self-reinforcing sealing.

[0016] As a preferred technical solution: Step S7 specifically includes: After there is no standing water inside the water-stop steel sleeve, apply cement-based penetrating crystallizer to the inner wall of the water-stop steel sleeve, the sealing plate at the bottom of the water-stop steel sleeve, and the top surface of the fan-shaped plate. Then, quick-setting sealing material is filled into the water-stop steel sleeve to seal the bottom. The quick-setting sealing material is then laid on the bottom sealing plate and the top surface of the fan-shaped plate. After the quick-setting sealing material reaches the required strength, fine aggregate concrete is poured inside the water-stop steel sleeve. The concrete covers the quick-setting sealing material and seals the entire water-stop steel sleeve.

[0017] As a preferred technical solution: Step S8 specifically includes: Pass the upper end of the tie rod through the pre-drilled hole in the perforated blind flange, then cover the upper flange of the waterstop steel sleeve with the perforated blind flange, and connect the perforated blind flange to the upper flange of the waterstop steel sleeve with a connector. A locking component is fixedly connected to the upper end of the pull rod, and the locking component abuts against the top surface of the perforated blind plate.

[0018] As a preferred technical solution: Step S9 specifically includes: After the specified period, observe the leakage and seepage of the water-stop steel sleeve and the perforated blind plate. If there is no leakage or seepage, use fine stone concrete to seal the reserved holes in the raft slab.

[0019] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: This invention utilizes BIM to refine the positioning of water-stop steel casings, prefabricates water-stop steel casings, perforated blind flanges, and petal-shaped umbrella-shaped sealing devices, ensuring that the dimensions of the water-stop steel casings, perforated blind flanges, and petal-shaped umbrella-shaped sealing devices are matched, the pre-embedding accuracy of the water-stop steel casings meets the standards, the sealing cross-sectional dimensions meet the design requirements, and the on-site assembly and construction quality is controllable. It avoids water seepage caused by rough on-site processing and poor splicing of sealing surfaces, and solves the problems of arbitrary drilling and open flames on-site and difficulty in controlling construction quality in traditional sealing methods. At the same time, it can also shorten the construction period of single-well sealing. This invention utilizes a petal-shaped umbrella-like sealing device that engages with the bottom flange of a water-stop steel casing. The water-stop steel casing, annular water-swellable sealing strip, fan-shaped plate, bottom sealing plate, and waterproof cloth form a composite water-stopping structure. The water-swellable sealing strip expands upon contact with water, automatically filling gaps and forming a water-pressure self-tightening sealing structure. This achieves water-stopping and seepage prevention within the well, as well as water-pressure self-reinforcing sealing. It can achieve sealing and leakage prevention under high-pressure conditions, significantly improving sealing reliability. The petal-shaped umbrella-like sealing device effectively isolates the pressurized water in the dewatering well, creating waterless construction conditions for subsequent sealing within the water-stop steel casing, thus achieving rapid well sealing and water-stopping. This invention forms a composite sealing system by using cement-based penetrating crystallization reinforcement, quick-setting sealing material for bottom sealing, and micro-expansion fine stone concrete for filling. This system can effectively prevent pressurized water from surging and leaking, and solves the problems of traditional sealing grout being easily dispersed by pressurized water, repeated grouting repairs, and the waste of permanent submersible pumps. This invention can disassemble, recycle, and reuse rainwater pumps, avoiding the permanent burial and scrapping losses of traditional submersible pumps or rainwater pumps. This invention can be applied to the construction of dewatering wells in basement raft foundations. Through prefabrication, assembly, petal-shaped umbrella-shaped sealing devices, and composite sealing within water-stop steel sleeves, it can achieve a waterless environment and steady well sealing during the sealing operation, ensuring that the dewatering well is sealed in one go, meets the pressure-bearing and seepage prevention indicators, significantly improves the first-time sealing qualification rate, and significantly reduces the subsequent leakage rate. This invention offers high construction efficiency, reduces rework, shortens the construction cycle of a single well, and saves on labor, materials, and equipment investment, resulting in significant economic and social benefits. Attached Figure Description

[0020] Figure 1 This is a flowchart of the rapid sealing method for basement raft slab dewatering wells and pipelines according to the present invention.

[0021] Figure 2 This is a schematic diagram illustrating the rapid sealing method for basement raft slab dewatering wells and pipelines described in this invention.

[0022] Figure 3 This is a plan view (in unfolded state) of the petal-shaped umbrella-shaped sealing device described in this invention.

[0023] Figure 4This is a schematic diagram of the lowering process of the petal-shaped umbrella-shaped sealing device described in this invention.

[0024] Icons: 1-Blind flange with holes, 2-Water-stop steel sleeve, 3-Water-stop wing ring, 4-Cement-based anti-seepage crystallization, 5-Waterproof membrane, 6-Main tie rod, 7-Waterproof cloth, 8-Concrete pipe for dewatering well, 9-Gravel, 10-Sliding ring, 11-Water-stop ring, 12-Diagonal tie rod, 13-Water-swellable water-stop strip, 14-Hinge, 15-Fan-shaped plate, 16-Bottom sealing plate, 17-Lifting lug, 18-Fine aggregate concrete, 19-Quick-setting sealing material. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] Example 1 like Figures 1-4 As shown in the figure, this embodiment proposes a method for rapid sealing of basement raft slab dewatering wells and pipes, including the following steps: S1: BIM-based detailed positioning; By using BIM parametric modeling, structural, waterproofing, and dewatering models are integrated to form a multi-disciplinary integrated model. Based on the multi-disciplinary integrated model, the pre-embedded coordinates and elevation of the water-stop steel sleeve 2 are marked; Based on the pre-embedded coordinates and elevation of the water-stop steel sleeve 2, the layout path of the main reinforcement of the raft slab around the well site is optimized to avoid collision between the water-stop steel sleeve 2 and the main reinforcement of the raft slab, and the detailed pre-embedded construction drawings of the water-stop steel sleeve 2 are output.

[0027] S2: Prefabricated water-stopping steel sleeve 2, perforated blind flange 1 and petal-shaped umbrella-shaped sealing device; The water-stop steel sleeve 2 has flanges at both ends, namely an upper flange and a lower flange; A positioning steel sleeve is fixed on the outer edge of the lower flange of the water-stop steel sleeve 2. The diameter of the positioning steel sleeve is larger than the diameter of the water-stop steel sleeve 2. The positioning steel sleeve and the water-stop steel sleeve 2 are integrally formed. A water-stop wing ring 3 is fixed to the outer wall of the water-stop steel sleeve 2; The perforated blind flange 1 is used to be installed on the upper end of the water-stop steel sleeve 2. The perforated blind flange 1 has a hole in the middle for the main tie rod 6 of the petal-shaped umbrella-shaped sealing device to pass through.

[0028] In this embodiment, the water-stop steel sleeve 2 is uniformly cut and rolled in the processing plant. Its inner diameter is produced according to the standard of 240mm, the outer diameter is 250mm, and the thickness is 5mm. The water-stop wing ring 3 is welded to the outer wall of the water-stop steel sleeve 2. The water-stop wing ring 3 is used for the termination and water-stopping of the waterproof membrane 5. The width of the water-stop wing ring 3 is 50mm and the thickness is 5mm. The center of the perforated blind plate 1 has a hole with a diameter of 12mm. The diameter of the perforated blind plate 1 is 340mm and the thickness is 10mm.

[0029] The petal-shaped umbrella-shaped sealing device includes multiple fan-shaped plates 15, a bottom sealing plate 16, a waterproof cloth 7, and an annular water-swellable sealing strip 13. The bottom sealing plate 16 is a circular plate, and multiple fan-shaped plates 15 are arranged around the bottom sealing plate 16 respectively. All the fan-shaped plates 15 form an annular structure around the bottom sealing plate 16, and each fan-shaped plate 15 is rotatably connected to the bottom sealing plate 16. Each sector plate 15 can rotate from a first position that is on the same plane as the bottom plate 16 to a second position that is perpendicular to the bottom plate 16. The sector plate 15 is in an unfolded state when it is in the first position and in a retracted state when it is in the second position. The waterproof cloth 7 is wrapped around the bottom of the bottom plate 16 and all the fan-shaped plates 15. The end of the waterproof cloth 7 is located on the top surface of the fan-shaped plate 15. In this way, the waterproof cloth 7 can seal the gap between adjacent fan-shaped plates 15 and the gap between the fan-shaped plate 15 and the bottom plate 16. The bottom of the bottom plate 16 and all the fan-shaped plates 15 can be completely sealed by the waterproof cloth 7. A ring-shaped water-swellable waterstop strip 13 is installed on the top surface of the ring structure formed by all the fan-shaped plates 15. The ring-shaped water-swellable waterstop strip 13 is installed at the closing point of the waterproof cloth 7. During the unfolding and closing of the fan-shaped plates 15, the ring-shaped water-swellable waterstop strip 13 is flexible and deformable. A main tie rod 6 is fixed in the middle of the top surface of the bottom plate 16, and a water-stop ring 11 is fixed in the middle of the main tie rod 6. Each sector plate 15 has a lifting lug 17 fixed on its top surface. A sliding ring 10 is slidably sleeved on the main tie rod 6. Each lifting lug 17 and the sliding ring 10 are hinged with a diagonal tie rod 12. The sliding ring 10 slides from bottom to top on the main tie rod 6, which allows all sector plates 15 to rotate from the unfolded state to the retracted state.

[0030] In this embodiment, the fan-shaped plate 15 and the bottom sealing plate 16 are made of steel plate. Six fan-shaped plates 15 are arranged around the bottom sealing plate 16. Each fan-shaped plate 15 is 6mm thick, has an outer diameter of 290mm, and an inner diameter of 220mm. The bottom sealing plate 16 has a diameter of 180mm and a thickness of 6mm. Each fan-shaped plate 15 is connected to the bottom sealing plate 16 by a hinge. The waterproof cloth 7 is made of reinforced PVC knife-coated cloth, which has good waterproof effect and certain extensibility. The main tie rod 6 has a diameter of 10mm, and the water-stop ring 11 is welded to the main tie rod 6. The annular water-swellable water-stop strip 13 has an outer diameter of 290mm. The sliding ring 10 is a sliding circular ring. The petal-shaped umbrella-shaped plugging device has a diameter of 220mm when folded and 290mm when unfolded. All steel components are uniformly treated for corrosion and rust prevention and are packaged and shipped according to single-well specifications. The sliding ring 10 and the main tie rod 6 are fitted with sliding damping to prevent the sector plate 15 from unfolding due to gravity during the process of lowering into the dewatering well, and to ensure that it remains in a retracted state during the lowering process.

[0031] S3: 2 water-stop steel sleeves pre-embedded on site; During the raft foundation reinforcement binding stage, the water-stop steel sleeve 2 is placed in the designed position according to the pre-embedded construction drawings of the water-stop steel sleeve 2 as detailed in step S1. The positioning of the water-stop steel sleeve 2 is achieved by cooperating with the concrete pipe 8 of the dewatering well.

[0032] In this embodiment, the positioning steel sleeve is sleeved on the outside of the dewatering well concrete pipe 8, and the lower flange of the water-stopping steel sleeve 2 is supported on the upper end of the dewatering well concrete pipe 8, thereby achieving the positioning of the water-stopping steel sleeve 2; the inner diameter of the dewatering well concrete pipe 8 is larger than the outer diameter of the water-stopping steel sleeve 2. The inner diameter of the positioning steel sleeve is 380mm and the outer diameter is 390mm.

[0033] S4: Construct the base slab, waterproof layer, and raft slab in sequence; After the foundation slab cushion concrete is poured and the foundation slab cushion is formed, waterproof membrane 5 is laid on the outer wall of the water-stop steel sleeve 2 below the water-stop ring 3 and on the foundation slab cushion to form a waterproof layer. The lower flange of the water-stop steel sleeve 2 is flush with the foundation slab. The raft slab body concrete is poured above the foundation slab cushion. The water-stop steel sleeve 2 is pre-embedded in the raft slab body. The top of the raft slab body has a pre-reserved hole. The upper part of the water-stop steel sleeve 2 is located in the hole of the raft slab body.

[0034] All concrete pouring must be cured to the strength specified in the design. The waterproof membrane is sealed with five overlapping layers to eliminate the risk of water seepage at the base of the two water-stop steel sleeves.

[0035] S5: Temporary precipitation; Stop dewatering from the dewatering wells, retrieve the dewatering pumps inside the wells, and simultaneously use self-priming pumps to temporarily dewater the wells to prevent groundwater from gushing to the surface. The self-priming pumps are placed on the ground.

[0036] S6: Lower the petal-shaped umbrella-shaped sealing device into the dewatering well; Before lowering the petal-shaped umbrella-shaped sealing device, manually pull the sliding ring 10 on the ground to make it slide from bottom to top on the main pull rod 6, so that the fan-shaped plate 15 reaches the closed state. Then, holding the main pull rod 6, the petal-shaped umbrella-shaped sealing device is vertically lowered from the upper opening of the water-stop steel sleeve 2 into the dewatering well. Since the petal-shaped umbrella-shaped sealing device is in a closed state at this time, its overall outer diameter is 220mm, which can avoid collision with the water-stop steel sleeve 2 during the lowering process. When the petal-shaped umbrella-shaped sealing device is lowered to the predetermined sealing position in the dewatering well, the sliding ring 10 is pushed down with the help of a tool (such as a long stick) so that it slides down on the main tie rod 6. Each sector plate 15 gradually unfolds in the dewatering well until it reaches the unfolded state. At this time, the petal-shaped umbrella-shaped sealing device is in the unfolded state, and its overall outer diameter is 290mm. The sector plate 15 and the bottom sealing plate 16 together form a circular sealing skeleton. The waterproof cloth 7 seals the gap between adjacent sector plates 15 and the gap between sector plates 15 and the bottom sealing plate 16. The sector plates 15, the bottom sealing plate 16 and the waterproof cloth 7 together form a complete circular pressure-bearing sealing structure, which has a complete circular pressure-bearing sealing surface. The upward-pulling petal-shaped umbrella-shaped sealing device makes the annular water-swellable water-stop strip 13 on the top surface of the fan-shaped plate 15 contact the bottom surface of the lower flange of the water-stop steel sleeve 2. The water-stop steel sleeve 2, the annular water-swellable water-stop strip 13, the fan-shaped plate 15, the bottom sealing plate 16 and the waterproof cloth 7 form a composite water-stop structure. The water-swellable water-stop strip expands when it comes into contact with water and automatically fills the gaps, forming a water pressure self-tightening sealing structure, realizing water-stopping and seepage prevention in the well and water pressure self-reinforcing sealing.

[0037] S7: Composite sealing inside the water-stop steel sleeve 2; After there is no standing water inside the water-stop steel sleeve 2, apply cement-based penetrating crystallization coating to the inner wall of the water-stop steel sleeve 2, the bottom sealing plate 16 at the bottom of the water-stop steel sleeve 2, and the top surface of the fan-shaped plate 15. Then, the quick-setting sealing material 19 is filled into the water-stop steel sleeve 2 to seal the bottom. The quick-setting sealing material 19 is laid on the top surface of the bottom sealing plate 16 and the fan-shaped plate 15, and its filling height is within 100mm. After the quick-setting sealing material 19 reaches the required strength, micro-expansion fine stone concrete 18 is poured inside the water-stop steel sleeve 2. The concrete covers the quick-setting sealing material 19 and seals the entire water-stop steel sleeve 2.

[0038] In this embodiment, the quick-setting sealing material 19 is quick-setting sealing king, which is an existing product. It is a hydraulic inorganic waterproof and sealing material with silicate cement, quartz sand and special quick-setting agent as the main components; cement-based penetrating crystallization can use existing products. The micro-expansion fine aggregate concrete 18 has a strength one grade higher than the main concrete of the raft foundation.

[0039] S8: Install blind flange with holes 1; Pass the upper end of the tie rod through the pre-drilled hole in the perforated blind plate 1, then cover the upper flange of the waterstop steel sleeve 2 with the perforated blind plate 1, and connect the perforated blind plate 1 to the upper flange of the waterstop steel sleeve 2 with bolts. A nut is connected to the upper end of the tie rod, the nut abuts against the top surface of the blind plate 1 with holes, and the nut is welded to the tie rod for locking.

[0040] S9: Seal the pre-reserved holes in the main body of the raft slab; After 14 days, observe the leakage and seepage of the water-stop steel sleeve 2 and the perforated blind plate 1. If there is no leakage or seepage, use micro-expansion fine stone concrete to seal the reserved holes in the raft slab.

[0041] Among them, the micro-expansion fine aggregate concrete has a strength one grade higher than that of the raft foundation concrete.

[0042] Preferably, before the water-stop steel sleeve 2 is pre-embedded, the dewatering well is filled with crushed stone 9.

[0043] This invention uses BIM to refine the positioning of the water-stop steel casing 2, prefabricate the water-stop steel casing 2, the perforated blind plate 1, and the petal-shaped umbrella-shaped sealing device. This ensures that the dimensions of the water-stop steel casing 2, the perforated blind plate 1, and the petal-shaped umbrella-shaped sealing device are matched, the pre-embedding accuracy of the water-stop steel casing 2 meets the standards, the sealing cross-sectional dimensions meet the design requirements, and the on-site assembly and construction quality is controllable. It avoids the situation of water seepage caused by rough on-site processing and poor splicing of sealing surfaces. It solves the problems of arbitrary drilling and open flame on-site in traditional sealing and the difficulty in controlling construction quality. At the same time, it can also shorten the construction period of single well sealing. This invention utilizes a petal-shaped umbrella-shaped sealing device that engages with the bottom flange of a water-stop steel casing 2. The water-stop steel casing 2, annular water-swellable sealing strip 13, fan-shaped plate 15, bottom sealing plate 16, and waterproof cloth 7 form a composite water-stop structure. The water-swellable sealing strip expands upon contact with water, automatically filling the gaps and forming a water-pressure self-tightening sealing structure. This achieves water-stopping and seepage prevention within the well, as well as water-pressure self-reinforcing sealing. It can achieve sealing and leakage prevention under high-pressure conditions, significantly improving sealing reliability. The petal-shaped umbrella-shaped sealing device effectively isolates the pressurized water in the dewatering well, creating waterless construction conditions for subsequent sealing within the water-stop steel casing 2, thus achieving rapid well sealing and water-stopping. This invention forms a composite sealing system by using cement-based penetrating crystallization reinforcement, quick-setting sealing material 19 for bottom sealing, and micro-expansion fine stone concrete 18 for filling. This system can effectively prevent the upward flow and leakage of pressurized water, and solves the problems of traditional sealing grout being easily dispersed by pressurized water, repeated grouting and repair, and the waste of permanent submersible pumps. This invention can disassemble, recycle, and reuse rainwater pumps, avoiding the permanent burial and scrapping losses of traditional submersible pumps or rainwater pumps. This invention can be applied to the construction of sealing wells for dewatering in basement raft foundations. Through prefabrication, assembly, petal-shaped umbrella-shaped sealing device and composite sealing within the water-stop steel sleeve 2, it can achieve a waterless environment and steady well sealing during the sealing operation, ensuring that the dewatering well is sealed in one go, the pressure-bearing and seepage prevention indicators meet the standards, the first-time sealing qualification rate is greatly improved, and the subsequent leakage rate is significantly reduced. This invention offers high construction efficiency, reduces rework, shortens the construction cycle of a single well, and saves on labor, materials, and equipment investment, resulting in significant economic and social benefits.

[0044] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for rapid sealing of basement raft slab dewatering wells and pipes, characterized in that: Includes the following steps: S1: BIM-based detailed positioning; S2: Prefabricated water-stopping steel sleeve, perforated blind flange and petal-shaped umbrella-shaped sealing device; S3: Pre-embedded water-stop steel sleeve on site; S4: Construct the base slab, waterproof layer, and raft slab in sequence; S5: Temporary precipitation; S6: Lower the petal-shaped umbrella-shaped sealing device into the dewatering well; S7: Composite sealing inside the water-stop steel sleeve; S8: Install a blind flange with holes; S9: Seal the pre-reserved holes in the main body of the raft.

2. The method for rapid sealing of basement raft slab dewatering wells and pipelines according to claim 1, characterized in that: Step S1 specifically includes: By using BIM parametric modeling, structural, waterproofing, and dewatering models are integrated to form a multi-disciplinary integrated model. Based on the multi-disciplinary integrated model, the pre-embedded coordinates and elevations of the water-stop steel sleeve are marked; Based on the pre-embedded coordinates and elevation of the water-stop steel casing, optimize the layout path of the main reinforcement of the raft slab around the well location, avoid collision between the water-stop steel casing and the main reinforcement of the raft slab, and output the detailed pre-embedded construction drawings of the water-stop steel casing.

3. The method for rapid sealing of basement raft slab dewatering wells and pipelines according to claim 1, characterized in that: In step S2: The water-stop steel sleeve has flanges at both ends, namely the upper flange and the lower flange; A positioning steel sleeve is fixed on the outer edge of the lower flange of the water-stop steel sleeve. The diameter of the positioning steel sleeve is larger than that of the water-stop steel sleeve. The positioning steel sleeve and the water-stop steel sleeve are integrally formed. A water-stop wing ring is fixed on the outer wall of the water-stop steel sleeve; The perforated blind flange is used to install on the upper end of the water-stop steel sleeve. The perforated blind flange has a hole in the middle for the main tie rod of the petal-shaped umbrella-shaped sealing device to pass through. The petal-shaped umbrella-shaped sealing device includes a bottom plate, a waterproof cloth, an annular water-swellable sealing strip, and multiple fan-shaped plates; The bottom plate is a circular plate, and multiple sector plates are arranged around the bottom plate. All the sector plates form a ring structure around the bottom plate, and each sector plate is rotatably connected to the bottom plate. Each sector panel can be rotated from the unfolded position to the folded position. The unfolded position is when the sector panel and the bottom panel are on the same plane. The waterproof fabric is wrapped around the bottom of the bottom panel and all the fan-shaped panels. The seam of the waterproof fabric is set on the top surface of the fan-shaped panels. The waterproof fabric can seal the gaps between adjacent fan-shaped panels and the gaps between the fan-shaped panels and the bottom panel. The top surface of the ring structure formed by all the fan-shaped plates is equipped with a ring-shaped water-swellable sealing strip, which is installed at the end of the waterproof cloth. A main tie rod is fixed in the middle of the top surface of the bottom plate, and a water-stop ring is fixed to the rod of the main tie rod; Each sector panel has a lifting lug fixed to its top surface. A sliding ring is slidably fitted on the main tie rod. A diagonal tie rod is hinged between each lifting lug and the sliding ring. The sliding ring slides from bottom to top on the main tie rod, allowing all sector panels to rotate from the unfolded position to the retracted position.

4. The method for rapid sealing of basement raft slab dewatering wells and pipelines according to claim 3, characterized in that: Step S3 specifically includes: According to the detailed construction drawings of the pre-embedded water-stop steel sleeve in step S1, the water-stop steel sleeve is placed in the design position. The water-stop steel sleeve is positioned by cooperating with the concrete pipe of the dewatering well.

5. The method for rapid sealing of basement raft slab dewatering wells and pipelines according to claim 4, characterized in that: In step S2, each sector plate can rotate from a first position that is on the same plane as the bottom plate to a second position that is perpendicular to the bottom plate. The sector plate is in an unfolded state when it is in the first position and in a folded state when it is in the second position. In step S3, the positioning steel sleeve is fitted over the outside of the dewatering well concrete pipe, and the lower flange of the water-stop steel sleeve is supported on the upper end of the dewatering well concrete pipe to position the water-stop steel sleeve.

6. The method for rapid sealing of basement raft slab dewatering wells and pipelines according to claim 4, characterized in that: Step S4 specifically includes: After the foundation slab cushion concrete is poured and formed, waterproof membrane is laid on the outer wall of the water-stop steel sleeve below the water-stop ring and on the foundation slab cushion to form a waterproof layer. The lower flange of the water-stop steel sleeve is flush with the foundation slab. The raft slab body concrete is poured above the foundation slab cushion. The water-stop steel sleeve is pre-embedded in the raft slab body. A raft slab body hole is reserved at the top of the raft slab body, and the upper part of the water-stop steel sleeve is located in the raft slab body hole.

7. The method for rapid sealing of basement raft slab dewatering wells and pipelines according to claim 1, characterized in that: Step S5 specifically includes: Stop dewatering from the dewatering wells, retrieve the dewatering pumps inside the wells, and simultaneously use self-priming pumps to temporarily dewater the wells to prevent groundwater from gushing to the surface. The self-priming pumps are placed on the ground.

8. The method for rapid sealing of basement raft slab dewatering wells and pipelines according to claim 6, characterized in that: Step S6 specifically includes: Before lowering the petal-shaped umbrella-shaped sealing device, manually pull the sliding ring on the ground to make it slide from bottom to top on the main pull rod, so that the fan-shaped plate reaches the closed state; Then, holding the main pull rod, vertically lower the petal-shaped umbrella-shaped sealing device from the top of the water-stop steel casing into the dewatering well; When the petal-shaped umbrella-shaped sealing device is lowered to the predetermined sealing position in the dewatering well, the sliding ring is pushed down with the help of a tool, causing it to slide down on the main tie rod. Each sector plate gradually unfolds in the dewatering well until it reaches the unfolded state. The sector plates and the bottom sealing plate together form a circular sealing skeleton. The waterproof cloth seals the gaps between adjacent sector plates and the gaps between sector plates and the bottom sealing plate. The sector plates, the bottom sealing plate, and the waterproof cloth together form a complete circular pressure-bearing sealing structure, which has a complete circular pressure-bearing sealing surface. The upward-pulling petal-shaped umbrella-shaped sealing device makes the annular water-swellable waterstop strip on the top surface of the fan-shaped plate contact the bottom surface of the lower flange of the waterstop steel sleeve. The waterstop steel sleeve, the annular water-swellable waterstop strip, the fan-shaped plate, the bottom sealing plate, and the waterproof cloth form a composite waterstop structure. The waterstop strip expands when it comes into contact with water and automatically fills the gaps, forming a water pressure self-tightening sealing structure, realizing water stoppage and seepage prevention in the well and water pressure self-reinforcing sealing.

9. The method for rapid sealing of basement raft slab dewatering wells and pipelines according to claim 8, characterized in that: Step S7 specifically includes: After there is no standing water inside the water-stop steel sleeve, apply cement-based penetrating crystallizer to the inner wall of the water-stop steel sleeve, the sealing plate at the bottom end of the water-stop steel sleeve, and the top surface of the fan-shaped plate. Then, quick-setting sealing material is filled into the water-stop steel sleeve to seal the bottom. The quick-setting sealing material is then laid on the bottom sealing plate and the top surface of the fan-shaped plate. After the quick-setting sealing material reaches the required strength, fine aggregate concrete is poured inside the water-stop steel sleeve. The concrete covers the quick-setting sealing material and seals the entire water-stop steel sleeve.

10. The method for rapid sealing of basement raft slab dewatering wells and pipelines according to claim 3, characterized in that: Step S8 specifically includes: Pass the upper end of the tie rod through the pre-drilled hole in the perforated blind flange, then cover the upper flange of the waterstop steel sleeve with the perforated blind flange, and connect the perforated blind flange to the upper flange of the waterstop steel sleeve with a connector. A locking component is fixedly connected to the upper end of the pull rod, and the locking component abuts against the top surface of the perforated blind plate.

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