Rapid plugging construction method for high-rise building basement deep foundation pit dewatering well

Abstract

The invention discloses a quick plugging construction method for a dewatering well of a basement deep foundation pit of a high-rise building. Comprising the following steps of preparation work, concrete cushion layer pouring and dewatering well pipe wall chiseling-off, manufacturing and installing of a dewatering well plugging device, waterproof layer and protective layer construction, basement bottom plate structure construction, plugging operation conducted through a plugging device and concrete pouring and curing. According to the rapid plugging construction method for the high-rise building basement deep foundation pit dewatering well, by means of close fit between the plugging plate and the bottom plate, the higher the water pressure in the dewatering well is, the tighter the two steel plates are attached, and the better the water stopping effect is, so that the plugging quality of the dewatering well is improved; the problems of difficult plugging construction, poor plugging effect and the like of the precipitation well are effectively solved; in addition, concrete is poured after plugging, the concrete cannot be impacted by water, the quality of the concrete is good, and the weak link of construction water stopping can be effectively solved.

Description

Technical Field

[0001] The invention relates to the technical field of plugging of dewatering wells, in particular to a rapid plugging construction method for a dewatering well in a deep foundation pit in a basement of a high-rise building. Background Art

[0002] With the rapid development of urban construction, the demand for underground space is increasing. Currently, there are more and more multi-story and super-large basements in buildings. In order to reduce the adverse effects of excessively high groundwater levels on construction, it is usually necessary to set up dewatering wells in the foundation slab to lower the groundwater level to the designed water level and ensure the stability of the foundation pit. The dewatering process runs through the entire process of underground engineering construction. The sealing of dewatering wells is the last step in the dewatering project. If the sealing method is improper, it is easy to cause water seepage in the basement slab, which will not only affect the normal use of the basement, but also increase the cost of subsequent maintenance and repairs, making the problem difficult to solve. The current conventional practice for sealing dewatering wells on construction sites is to inject micro-expansive concrete into the steel pipe of the dewatering well, block the water level, and then directly weld steel plates for sealing. This approach is more difficult to construct when the water flow in the dewatering well is large. The water flow can easily wash away the micro-expansive concrete, causing the injected micro-expansive concrete to fail to solidify. At the same time, it affects the welding of the sealing steel plate, resulting in the inability to complete the sealing work. According to the actual situation on site, our project decided to adopt a sealing device for the basement floor dewatering well. Through the design and installation connection of the sealing device, the sealing quality of the dewatering well was improved, thereby effectively solving the problems of difficult sealing construction and poor sealing effect of the dewatering well. Summary of the Invention

[0003] This application proposes a method for quickly sealing a dewatering well in a deep foundation pit in a basement of a high-rise building. Through the design and installation connection of a blocking device, the method is used to solve the problems of difficult sealing construction and poor sealing effect of the dewatering well.

[0004] To achieve the above-mentioned purpose, the present application adopts the following technical solution: a method for quickly plugging a dewatering well in a deep foundation pit in a high-rise building basement, comprising the following steps: S1. Preparation: S2. Concrete cushion pouring and dewatering well pipe wall chiseling; S3. Production and installation of precipitation well plugging device: S4. Construction of waterproof layer and protective layer; S5. Construction of basement floor structure; S6, the plugging device performs the plugging operation; S7. Concrete pouring and maintenance.

[0005] Furthermore, the preparation of S1 includes the following steps: S11. Be familiar with the layout drawings of precipitation wells and find the locations of all precipitation wells by comparing them on site; S12. Stop the pump and measure the rate of water level rise to determine the water output of each well, determine the shortest time and order for sealing the wells, and monitor the changes in the groundwater level and adjacent areas at any time; S13. Clean up the debris in the precipitation well, and prepare the sand, cement, gravel and other materials needed during the construction process. Prepare the compaction tools, and have safety personnel supervise on site.

[0006] Furthermore, the process of pouring the concrete cushion layer of S2 and chiseling out the wall of the precipitation well is as follows: after completing the preparatory work for sealing the precipitation well, clean up the debris on the surface of the base layer, and promptly carry out the pouring and maintenance of the concrete cushion layer. After the precipitation well wall is broken, it must not be higher than the cushion layer. If there is any damage, it should be filled in time to ensure that the sealing device is placed flat.

[0007] Furthermore, the production and installation of the S3 dewatering well plugging device includes: S31. Production of blocking device: The sealing device includes a steel pipe, a base plate, a flange, a sealing plate and a hanger. The flange is fixed to the upper opening of the steel pipe, the flange is fixedly connected to the steel pipe by welding, the base plate is fixed to the lower opening of the steel pipe, and the base plate is fixedly connected to the steel pipe by welding. The diameter of the opening of the base plate is smaller than the diameter of the lower opening of the steel pipe. There are three hangers, and the upper end of the hanger is provided with an external thread. The hanger is arranged in the steel pipe and the upper end of the steel pipe is threadedly connected to the flange and fixed by fasteners. The lower end of the hanger passes through the base plate and is fixedly connected to the sealing plate. The sealing plate is arranged horizontally and the diameter of the sealing plate is larger than the diameter of the opening of the base plate. A water-stop wing ring is also fixedly mounted on the outer surface of the steel pipe. The water-stop wing ring is located in the middle position of the steel pipe. The outer diameter of the water-stop wing ring is smaller than the outer diameter of the steel pipe. A rubber ring is provided on the upper surface of the sealing plate of the device along the edge of the sealing plate, which can effectively prevent water seepage from the gap caused by unevenness when the sealing plate and the base plate are squeezed.

[0008] S32. Installation of the plugging device: Level the surface of the precipitation well to ensure that the precipitation well is level with the base, fix the plugging device on the wellhead above the center of the precipitation well, and pass the precipitation pump through the plugging device to perform precipitation operations.

[0009] Furthermore, the construction process of the S4 waterproof layer and protective layer is as follows: when constructing the waterproof protective layer, the waterproof protective layer is folded up to the bottom of the water stop ring outside the sealing device, and sealing putty is used for waterproof closing.

[0010] Furthermore, the S5 basement floor structure construction process is as follows: When tying the floor reinforcement, the reinforcement should be constructed around the sealing device according to the drawings and design requirements. The reinforcement around the sealing device can be continuously cut and bypassed. If the reinforcement is broken, additional reinforcement should be added around the sealing device as a reinforcement measure. When pouring concrete for the drainage well pipe wall, the concrete is poured to the outside of the sealing device, and no concrete is poured inside the steel pipe of the sealing device.

[0011] Furthermore, the process of the S6 plugging device for plugging operation is: stop the precipitation after the precipitation depth reaches the design requirement, and at the same time take out the precipitation pump to make the plugging device work, loosen the fasteners of the boom and the flange, pull the boom upward to make the plugging plate and the bottom plate tightly combined, and then tighten the fasteners to check whether there are any leaks. If there are any leaks, mark the location of the leaks, add a cover plate to seal the leaks in time, and proceed to the next step after observing that there are no leaks for many times.

[0012] Furthermore, the process of pouring and curing the S7 concrete is as follows: pouring concrete in the pipe and using a vibrator to compact the concrete.

[0013] The present invention has the following beneficial effects: The present application provides a method for quickly sealing a dewatering well in a deep foundation pit in a basement of a high-rise building. By setting a special sealing device and utilizing the tight fit between the sealing plate and the bottom plate, the greater the water pressure in the dewatering well, the tighter the two steel plates are attached, and the better the water-stopping effect. In addition, a rubber ring is provided along the edge of the sealing plate on the upper surface of the device's sealing plate, which can effectively prevent water seepage from gaps caused by unevenness when the sealing plate and the bottom are squeezed, thereby improving the sealing quality of the dewatering well, and effectively solving the problems of difficult dewatering well sealing construction and poor sealing effect. In addition, after sealing, concrete is poured in, and the concrete will not be affected by the impact of water. The concrete quality is good, which can effectively solve the weak links in construction water-stopping. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments disclosed herein and, together with the description, serve to explain the principles disclosed herein.

[0015] The present disclosure can be more clearly understood from the following detailed description with reference to the accompanying drawings, in which: Figure 1 Schematic diagram of the process; Figure 2 This is the process flow chart for the rapid sealing of the dewatering well in the deep foundation pit of the basement; Figure 3 Schematic diagram of the plugging device structure; Figure 4 is a cross-sectional view of the plugging device; Figure 5 This is a top view of the blocking device.

[0016] In the figure: 1. Steel pipe; 2. Bottom plate; 3. Water stop wing ring; 4. Flange; 5. Sealing plate; 6. Hanger; 7. Rubber ring; 8. Fastener; 9. Dewatering well; 10. Dewatering well pipe wall; 11. Concrete cushion layer; 12. Waterproof protective layer. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0018] See attached Figure 1 and attached Figure 2 The construction process of rapid sealing of dewatering wells in deep foundation pits of basements is shown in the attached Figure 2 shown.

[0019] S1. Preparation: S11. Be familiar with the layout drawings of precipitation wells and find the locations of all precipitation wells by comparing them on site; S12. Stop the pump and measure the rate of water level rise to determine the water output of each well, determine the shortest time and order for sealing the wells, and monitor the changes in the groundwater level and adjacent areas at any time; S13. Clear the debris in the precipitation well and prepare the sand, cement, gravel and other materials needed for the construction process. Prepare the tamping tools and have the safety personnel on site to supervise. S2. Concrete pad pouring and drainage well wall removal: After completing the preparations for the drainage well plugging, clean up the debris on the base surface and promptly pour and maintain the concrete pad. The drainage well wall should not be higher than the pad after being broken. Any damage should be promptly repaired to ensure that the plugging device is placed flat. S3. Production and installation of precipitation well plugging device: S31. Production of blocking device: Please see the attached Figure 3 , Attachment Figure 4 and attached Figure 5As shown, the sealing device includes a steel pipe 1, a base plate 2, a flange 4, a sealing plate 5 and a hanger 6. The flange 4 is fixed to the upper opening of the steel pipe 1, and the flange 4 and the steel pipe 1 are fixedly connected by welding. The base plate 2 is fixed to the lower opening of the steel pipe 1, and the base plate 2 and the steel pipe 1 are fixedly connected by welding. The diameter of the opening of the base plate 2 is smaller than the diameter of the lower opening of the steel pipe 1. There are three hangers 6, and the upper end of the hanger 6 is provided with an external thread. The hanger 6 is arranged in the steel pipe 1 and the upper end of the steel pipe 1 is threadedly connected to the flange 4 and fixed by a fastener 8. The lower end of the hanger 6 passes through the base plate and is fixedly connected to the sealing plate 5. The sealing plate 5 is horizontally arranged and the diameter of the sealing plate 5 is larger than the diameter of the opening of the base plate 2. A water stop wing ring 3 is also fixedly mounted on the outer surface of the steel pipe 1. The water stop wing ring 3 is located in the middle position of the steel pipe 1, and the outer diameter of the water stop wing ring 3 is smaller than the outer diameter of the steel pipe 1. A rubber ring 7 is provided on the upper surface of the sealing plate of the device along the edge of the sealing plate 5 , which can effectively prevent water from seeping through the gap caused by unevenness when the sealing plate 5 and the bottom plate 2 are squeezed.

[0020] This sealing device achieves a tight fit between the sealing plate 5 and the base plate 2. The greater the water pressure in the drainage well 9, the tighter the two steel plates adhere, resulting in a better water-stopping effect. Furthermore, a rubber ring 7 is provided on the sealing plate 5 to prevent water seepage through gaps caused by unevenness when the sealing plate 5 is squeezed against the base. After sealing, concrete is poured in, protecting the concrete from the impact of water, ensuring improved concrete quality. Therefore, this sealing device effectively addresses a weak link in water-stopping construction.

[0021] S32. Installation of the blocking device: Level the surface of the precipitation well 9 to ensure that the precipitation well 9 is level with the base, fix the blocking device on the wellhead above the center of the precipitation well 9, and pass the precipitation pump through the blocking device to perform precipitation operations.

[0022] S4. Construction of waterproof layer and protective layer: When constructing the waterproof protective layer 12, the waterproof protective layer 12 is turned up to the bottom of the water stop wing ring 3 outside the sealing device, and sealing putty is used for waterproof closing treatment.

[0023] S5. Basement Floor Slab Construction: When tying the reinforcement for floor slab 2, follow the drawings and design requirements around the sealing device. The reinforcement around the sealing device can be continuously bypassed. If the reinforcement is disconnected, additional reinforcement should be added around the sealing device. When pouring concrete at the dewatering well pipe wall 10, pour the concrete to the outside of the sealing device. Do not pour concrete inside the sealing device's steel pipe 1.

[0024] S6. The plugging device performs the plugging operation: stop the precipitation after the precipitation depth reaches the design requirement, and take out the precipitation pump at the same time to make the plugging device work, loosen the fasteners 8 between the hanger 6 and the flange 4, pull the hanger 6 upward to make the plugging plate 5 and the bottom plate 2 tightly combined, and then tighten the fasteners 8 to check whether there are any leaks. If there are any leaks, mark the location of the leaks, add a cover plate to seal the leaks in time, and proceed to the next step after observing for leaks for many times.

[0025] S7. Concrete pouring and curing: Pour concrete in the pipe and use a vibrator to compact the concrete.

[0026] The process principle of this application: The working principle of this plugging device is shown in Figure 1 As shown, after the construction of the building's concrete cushion layer 11 and waterproof protective layer 12, the plugging device is installed at the precipitation well 9. The bottom plate 2 is placed on the concrete cushion layer 11 and the precipitation well pipe wall 10. The water pump and cable are placed into the precipitation well 9 through the gap between the hangers 6 below the steel pipe 1. The basement bottom plate 2 reinforcement is installed. The reinforcement and bracket should firmly fix the plugging device. The template is installed on the upper half of the bottom plate 2, exposing the flange 4. The bottom plate 2 concrete is poured as shown in the figure. Figure 1 As shown, the engineering structure and dewatering work continue. When the construction design requires stopping dewatering, the water pump is pulled out of the steel pipe 1, the suspension rod 6 is pulled upward, the sealing plate 5 is tightly connected to the bottom plate 2, the fastener 8 is tightened, the rubber ring 7 acts as a seal, the water in the dewatering well 9 is isolated, and the concrete in the steel pipe 1 and the reserved part of the concrete are poured.

[0027] This technology is suitable for plugging pipe wells in basement dewatering wells in urban super-high-rise buildings with large water gushing volume, deep dewatering depth, rapid water level rise, and high soil permeability. It can also be used for plugging pressure wells.

Claims

1. A method for quickly plugging a dewatering well in a deep foundation pit of a high-rise building basement, characterized in that: The following steps are involved: S1. Preparation: S2. Concrete cushion pouring and dewatering well pipe wall chiseling; S3. Production and installation of precipitation well plugging device: S4. Construction of waterproof layer and protective layer; S5. Construction of basement floor structure; S6, the plugging device performs the plugging operation; S7. Concrete pouring and maintenance.

2. The method for rapidly plugging a dewatering well in a deep foundation pit of a high-rise building basement according to claim 1 is characterized in that: The preparation of S1 includes the following steps: S11. Be familiar with the layout drawings of precipitation wells and find the locations of all precipitation wells by comparing them on site; S12. Stop the pump and measure the rate of water level rise to determine the water output of each well, determine the shortest time and order for sealing the wells, and monitor the changes in the groundwater level and adjacent areas at any time; S13. Clean up the debris in the precipitation well, and prepare the sand, cement, gravel and other materials needed during the construction process. Prepare the compaction tools, and have safety personnel supervise on site.

3. The method for rapidly plugging a dewatering well in a deep foundation pit of a high-rise building basement according to claim 2, wherein: The process of pouring the concrete cushion layer of S2 and removing the wall of the precipitation well is as follows: after completing the preparatory work for sealing the precipitation well, clean up the debris on the surface of the base layer, and promptly carry out the pouring and maintenance of the concrete cushion layer. After the precipitation well wall is broken, it must not be higher than the cushion layer. If there is any damage, it should be filled and leveled in time to ensure that the sealing device is placed flat.

4. The method for rapidly plugging a dewatering well in a deep foundation pit of a high-rise building basement according to claim 3 is characterized in that: The production and installation of the S3 dewatering well plugging device include: S31. Production of blocking device: The plugging device comprises a steel pipe (1), a bottom plate (2), a flange (4), a plugging plate (5) and a suspender (6), wherein the flange (4) is fixed to the upper opening of the steel pipe (1), the flange (4) and the steel pipe (1) are fixedly connected by welding, the bottom plate (2) is fixed to the lower opening of the steel pipe (1), the bottom plate (2) and the steel pipe (1) are fixedly connected by welding, the diameter of the opening of the bottom plate (2) is smaller than the diameter of the lower opening of the steel pipe (1), there are three suspenders (6), and the upper end of the suspender (6) is provided with an external thread, the suspender (6) is arranged in the steel pipe (1) and the steel pipe (1) is fixedly connected to the bottom plate (2). ) is threadedly connected to the flange (4) and fixed by a fastener (8), the lower end of the suspension rod (6) passes through the bottom plate and is fixedly connected to the blocking plate (5), the blocking plate (5) is horizontally arranged and the diameter of the blocking plate (5) is larger than the diameter of the opening of the bottom plate (2), and a water stop wing ring (3) is fixedly sleeved on the outer surface of the steel pipe (1), the water stop wing ring (3) is located in the middle of the steel pipe (1), and the outer diameter of the water stop wing ring (3) is smaller than the outer diameter of the steel pipe (1), and a rubber ring (7) is arranged on the upper surface of the blocking plate of the device along the edge of the blocking plate (5); S32. Installation of the blocking device: Level the surface of the precipitation well (9) to ensure that the precipitation well (9) is level with the base, fix the blocking device on the wellhead above the center of the precipitation well (9), and pass the precipitation pump through the blocking device to perform precipitation operations.

5. The method for rapidly sealing a dewatering well in a deep foundation pit of a high-rise building basement according to claim 4 is characterized in that: The construction process of the S4 waterproof layer and protective layer is as follows: when constructing the waterproof protective layer (12), the waterproof protective layer (12) is turned up to the bottom of the water stop ring (3) outside the sealing device, and the waterproof closing treatment is performed using sealing cement.

6. The method for rapidly plugging a dewatering well in a deep foundation pit of a high-rise building basement according to claim 5, characterized in that: The construction process of the S5 basement floor structure is as follows: When tying the steel bars of the floor (2), the construction should be carried out around the plugging device according to the drawings and design requirements. The steel bars around the plugging device can be continuously cut and bypassed. When the steel bars are cut, additional steel bars should be added around the plugging device to strengthen the device. When pouring the concrete at the dewatering well pipe wall (10), the concrete is poured to the outside of the plugging device, and no concrete is poured inside the steel pipe (1) of the plugging device.

7. The method for rapidly plugging a dewatering well in a deep foundation pit of a high-rise building basement according to claim 6, wherein: The process of the S6 plugging device for plugging is as follows: stop the precipitation after the precipitation depth reaches the design requirement, remove the precipitation pump at the same time, and make the plugging device work, loosen the fasteners (8) between the suspension rod (6) and the flange (4), pull the suspension rod (6) upward to make the plugging plate (5) and the bottom plate (2) tightly combined, and then tighten the fasteners (8) to check whether there is a leak. If there is a leak, mark the location of the leak and add a cover plate to plug the leak in time. After observing for many times that there is no leak, the next step can be carried out.

8. The method for rapidly plugging a dewatering well in a deep foundation pit of a high-rise building basement according to claim 7, characterized in that: The process of S7 concrete pouring and curing is as follows: pour concrete in the pipe and use a vibrator to compact the concrete.

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