A large water yield precipitation well steel cover plate secondary plugging precipitation construction method

Abstract

The application relates to a large-water-yield dewatering well steel cover plate secondary plugging dewatering construction method, and belongs to the technical field of building construction, which comprises the following steps: S1, determining the positions of all dewatering wells according to construction drawings, and preparing all materials required for construction; S2, processing the first steel cover plate, and initially installing the first steel cover plate in the dewatering well; S3, installing the water pipe connecting device on the first steel cover plate, then passing the water pipe of the gasoline self-suction pump through the water pipe connecting device, starting the gasoline self-suction pump, and starting to dewater the dewatering well; S4, welding the first steel cover plate during the dewatering process, taking out the water pipe after the dewatering is completed, and pouring micro-expansion concrete on the first steel cover plate; and S5, welding the second steel cover plate after the concrete is solidified. The application has the effect of reducing the cost.

Description

Technical Field

[0001] This application relates to the technical field of building construction, and in particular to a construction method for secondary sealing and dewatering of large-output dewatering wells using steel cover plates. Background Technology

[0002] As people's lives develop at an increasingly rapid pace, construction projects are becoming more and more common. Foundation pit construction is a relatively common type of construction project. After the foundation pit is excavated, the dewatering wells need to be sealed. Improper sealing of dewatering wells with high water content and flow rate can cause great damage to the project.

[0003] The typical technique for sealing large-volume dewatering wells involves leaving a submersible pump inside the well to pump water. While pumping, a mixture of dry materials is added to the well. When the backfill reaches 500mm below the wellhead, the water pipes and cables are quickly cut off. The remaining portion is then rapidly filled, compacted, and a steel cover plate is welded on.

[0004] Regarding the aforementioned technologies, the inventors believe that this approach makes it impossible to remove the submersible pump after the sealing is completed. A project may require dozens of submersible pumps, resulting in high costs. Furthermore, the mixture does not have enough time to solidify, and after the pump power is cut off, a large flow of groundwater can easily damage the unformed mixture structure. It is difficult to ensure that the dewatering well can be welded in a waterless environment, resulting in high costs. Summary of the Invention

[0005] In order to reduce costs, this application provides a construction method for secondary sealing and dewatering of large-output dewatering wells using steel cover plates.

[0006] This application provides a secondary sealing and dewatering construction method using steel cover plates for large-output dewatering wells, employing the following technical solution:

[0007] A method for secondary sealing and dewatering construction of high-output dewatering wells using steel cover plates includes the following steps:

[0008] S1. Determine the location of all dewatering wells according to the construction drawings and prepare all the materials required for construction;

[0009] S2. Process the first steel cover plate and initially install the first steel cover plate in the dewatering well;

[0010] S3. Install the water pumping pipe connection device on the first steel cover plate, then pass the water pumping pipe of the gasoline self-priming pump through the water pumping pipe connection device, start the gasoline self-priming pump, and start dewatering the dewatering well.

[0011] S4. During the precipitation process, the first steel cover plate is welded immediately. After the precipitation is completed, the pumping pipe is removed and micro-expansion concrete is poured on the first steel cover plate.

[0012] S5. After the concrete has set, weld the second steel cover plate.

[0013] By adopting the above technical solution, the first steel cover plate is welded immediately during the precipitation process, resulting in a better precipitation effect. After the precipitation is completed, the pumping pipe is removed, and the gasoline self-priming pump is located outside the precipitation well. The gasoline self-priming pump can be removed, avoiding leaving the pump inside the precipitation well. Micro-expansion concrete is then poured on the first steel cover plate, and a second steel cover plate is welded to complete the sealing of the precipitation well, thereby reducing costs.

[0014] Optionally, in step S2, during the processing of the first steel cover plate, a steel handle is welded onto the first steel cover plate.

[0015] By adopting the above technical solution, a steel bar handle is welded onto the first steel cover plate. When the first steel cover plate is installed and fixed in the dewatering well, the steel bar handle facilitates the installation and positioning of the first steel cover plate, thus achieving the effect of facilitating the installation and positioning of the first steel cover plate.

[0016] Optionally, in step S3, a nylon filter screen is fixed at the end of the water pipe away from the gasoline self-priming pump.

[0017] By adopting the above technical solution, when dewatering wells are used, the gasoline self-priming pump is started. The nylon filter screen filters out mud and sand impurities during the pumping process, preventing the gasoline self-priming pump from becoming clogged and thus protecting it.

[0018] Optionally, in step S3, when starting the gasoline self-priming pump to dewater the dewatering well, the graded sand and gravel, quick-drying cement, grouting liquid, grouting material and other quick-setting materials are poured into the dewatering well in sequence.

[0019] By adopting the above technical solution, during the dewatering process of the dewatering well, graded sand and gravel, quick-drying cement, grouting liquid, and grouting material are poured into the dewatering well in sequence to slow down the rise of the water level and facilitate the welding of the first steel cover plate, thus achieving the effect of facilitating the welding of the first steel cover plate.

[0020] Optionally, in step S4, after the first steel cover plate is welded and carefully inspected, the gasoline self-priming pump is stopped to pump water. The pump is then observed to see if water seeps out from the weld or other parts. If water seeps out, the seepage point is marked and the pump is restarted to pump water again for repair welding. This process is repeated several times until it is ensured that no water seeps out.

[0021] By adopting the above technical solution, after welding is completed, an inspection is carried out, and timely repair welding is performed to ensure the quality of the sealing and achieve the effect of improving the sealing quality.

[0022] A water pump connection device includes a rectangular connecting block, a U-shaped cover plate, and a gasoline self-priming pump. The rectangular connecting block is installed on a first steel cover plate, and the U-shaped cover plate covers the rectangular connecting block. A first through hole is provided on the rectangular connecting block, and a second through hole is provided on the U-shaped cover plate. The water pump passes through both the first and second through holes. The water pump, the rectangular connecting block, and the U-shaped cover plate are slidably connected. The gasoline self-priming pump is located outside the first steel cover plate.

[0023] By adopting the above technical solution, when it is necessary to dewater the dewatering well, the rectangular connecting block is installed on the U-shaped cover plate, the U-shaped cover plate covers the rectangular connecting block, the pumping pipe passes through the first through hole and the second through hole at the same time, the pumping pipe is fixed, the gasoline self-priming pump is started, and the dewatering well is dewatered. The gasoline self-priming pump is located outside the dewatering well, which avoids leaving the pump in the dewatering well after sealing it, thus achieving the effect of reducing costs.

[0024] Optionally, a connecting plate is provided between the rectangular connecting block and the first steel cover plate. The connecting plate and the first steel cover plate are fixedly connected. The rectangular connecting block is embedded in the connecting plate. The rectangular connecting block and the connecting plate are slidably connected. A third through hole is provided on the connecting plate, through which the water pumping pipe passes.

[0025] By adopting the above technical solution, the connecting plate and the first steel cover plate are fixedly connected, the rectangular connecting block is connected to the connecting plate, and the setting of the connecting plate connects the first steel cover plate and the rectangular connecting block, thereby achieving the effect of connecting the steel cover plate and the rectangular connecting block.

[0026] Optionally, the connecting plate has an installation groove on the side away from the first steel cover plate, and one end of the rectangular connecting block is embedded in the installation groove. Two positioning blocks are arranged opposite each other in the installation groove of the connecting plate. Both positioning blocks are slidably connected to the connecting plate. Multiple positioning grooves are provided on the side wall of the rectangular connecting block. When the water pumping pipe connection device is used, the positioning block is embedded in the positioning groove. When the water pumping pipe connection device is not used, the positioning block is completely disengaged from the positioning groove.

[0027] By adopting the above technical solution, when the water pumping pipe connection device is used, the positioning block is embedded in the positioning groove, thereby connecting the rectangular connection block and the connection plate. When the water pumping pipe connection device is not used or when the water pumping pipe connection device is being repaired, the positioning block is slid to disengage from the positioning groove, thereby removing the rectangular connection block for removal or repair, achieving the effect of facilitating maintenance and replacement of the connection block.

[0028] Optionally, a spring is provided between the positioning block and the connecting plate. One end of the spring is fixedly connected to the positioning block, and the other end of the spring is fixedly connected to the connecting plate. When the positioning block is embedded in the positioning groove, the spring is in a stretched state. When the spring is in a natural state, the positioning block is completely disengaged from the positioning groove.

[0029] By adopting the above technical solution, when the rectangular connecting block is embedded in the connecting plate, the positioning block is embedded in the positioning groove. At this time, the spring is in a stretched state. When it is necessary to separate the rectangular connecting block and the connecting plate, the spring will pull out the positioning block, achieving a convenient and quick effect.

[0030] Optionally, the connecting plate is provided with multiple locking slots. When the water pumping pipe connecting device is used, the ends of the U-shaped cover plate are all embedded in the locking slots. At this time, both ends of the U-shaped cover plate are tightly abutted against the positioning block.

[0031] By adopting the above technical solution, when the water pipe connection device is required, a U-shaped cover plate is placed over the rectangular connecting block, and the end of the U-shaped cover plate is embedded in the locking groove. During the installation of the U-shaped cover plate, the positioning block is pushed into the positioning groove to fix the rectangular connecting block. At this time, the end of the U-shaped cover plate is embedded in the connecting plate. While fixing the U-shaped cover plate, the rectangular connecting block is also fixed, making the overall stability of the water pipe connection device higher. When it is necessary to remove or repair the water pipe connection device, the U-shaped cover plate is slid out, and the positioning block is pulled out under the action of the spring, thereby removing the U-shaped cover plate and the rectangular connecting block at the same time, achieving a convenient and quick effect.

[0032] In summary, this application includes at least one of the following beneficial technical effects:

[0033] 1. The design of the rectangular connecting block, U-shaped cover plate, gasoline self-priming pump, first through hole, and second through hole achieves the effect of cost reduction;

[0034] 2. The connecting plate is designed to connect the steel cover plate and the rectangular connecting block;

[0035] 3. The installation slot, positioning block, and positioning slot are designed to facilitate maintenance and replacement of the connecting block;

[0036] 4. The spring and locking slot design achieve a convenient and quick result. Attached Figure Description

[0037] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application;

[0038] Figure 2 This is a cross-sectional view of an embodiment of this application;

[0039] Figure 3 yes Figure 2 A magnified view of part A in the diagram.

[0040] In the diagram, 1 is a rectangular connecting block; 11 is the first through hole; 2 is a U-shaped cover plate; 21 is the second through hole; 3 is a gasoline self-priming pump; 4 is a connecting plate; 5 is a mounting groove; 6 is a positioning block; 7 is a positioning groove; 8 is a spring; and 9 is a snap-fit ​​groove. Detailed Implementation

[0041] The following is in conjunction with the appendix Figure 1-3 This application will be described in further detail.

[0042] This application discloses a construction method for secondary sealing and dewatering of large-output dewatering wells using steel cover plates.

[0043] A method for secondary sealing and dewatering construction of high-output dewatering wells using steel cover plates includes the following steps:

[0044] S1. Familiarize yourself with the layout drawings of the dewatering wells, locate all the dewatering wells according to the drawings, stop the pumps and measure the rate of water level rise, determine the output of each dewatering well, determine the shortest time and sequence of well sealing, calculate the number of steel cover plates, and measure the diameter of the pump drainage pipes and cables inside the dewatering wells.

[0045] Prepare the necessary materials and tools for construction. These mainly include steel sleeves, waterstops, steel cover plates, cement, gravel, sand, admixtures (anti-seepage agents, early-strength agents), measuring tools, a self-priming pump, and drainage pipes. Before constructing the foundation concrete pad, fabricate waterproof steel sleeves and weld waterstops to the outside of the sleeves. During foundation pad construction, embed the waterproof steel sleeves into the concrete pad and pass a dewatering pump through the waterproof steel sleeves for dewatering. Furthermore, the installation height of the waterproof steel sleeves should be 600m lower than the building elevation of that floor, and care should be taken to prevent damage to the waterproof steel sleeves during concrete slab pouring.

[0046] S2. Inspect the connection between the water pumping pipe connection device and the first steel cover plate.

[0047] Reference Figure 1 A water pumping pipe connection device includes a rectangular connecting block 1, a U-shaped cover plate 2, and a gasoline self-priming pump 3. The rectangular connecting block 1 and the U-shaped cover plate 2 are used together to connect the water pumping pipe and the dewatering well, and the gasoline self-priming pump 3 is used to pump water from the dewatering well.

[0048] Reference Figure 1 A connecting plate 4 is provided on the first steel cover plate. The connecting plate 4 is arranged parallel to the first steel cover plate. One side of the connecting plate 4 is fixedly connected to the first steel cover plate. A third through hole is provided on the connecting plate 4. The third through hole is located at the center of the connecting plate 4.

[0049] The connecting plate 4 has an installation groove 5 on the side away from the first steel cover plate. The length direction of the installation groove 5 is the same as the length direction of the connecting plate 4, and the connection between the geometric center of the installation groove 5 and the geometric center of the connecting plate 4 is perpendicular to the first steel cover plate. One end of the rectangular connecting block 1 is embedded in the installation groove 5 along its length direction. The projection of the rectangular connecting block 1 along its own length direction onto the plane where the installation groove 5 is located is placed in the installation groove 5.

[0050] Two positioning grooves 7 are provided on the side wall of the rectangular connecting block 1. The two positioning grooves 7 are provided on two different side walls and are arranged opposite to each other. The length direction of the two positioning grooves 7 is the same, and they are both the same as the length direction of the connecting plate 4.

[0051] Two springs 8 are installed in the mounting groove 5 of the connecting plate 4. The two springs 8 are located at both ends of the mounting groove 5 along its length. The length direction of the two springs 8 is the same as that of the mounting groove 5, and the axes of the two springs 8 are on the same straight line. One end of each spring 8 is fixedly connected to the side wall of the mounting groove 5. A positioning block 6 is provided at the end of the spring 8 away from the side wall of the mounting groove 5. The length direction of the positioning block 6 is the same as that of the spring 8. One end of the positioning block 6 along its length is fixedly connected to the end of the spring 8 away from the side wall of the mounting groove 5. A distance is left between the two positioning blocks 6.

[0052] When the water pipe connection device is installed, the positioning block 6 is embedded in the positioning groove 7, and the spring 8 is in a stretched state. When the spring 8 is in a natural state, the positioning block 6 is completely disengaged from the positioning groove 7. The positioning block 6 and the positioning groove 7 are slidably connected, and the sliding direction is set along the length direction of the positioning block 6.

[0053] Reference Figure 2 and Figure 3 A first through hole 11 is provided on the rectangular connecting block 1, and a second through hole 21 is provided on the U-shaped cover plate 2. The line connecting the geometric centers of the first through hole 11 and the second through hole 21 passes through the third through hole. The water pump pipe passes through the first through hole 11, the second through hole 21 and the third through hole simultaneously. The first through hole 11 is the largest and the second through hole 21 is the smallest. When the water pump pipe passes through the first through hole 11, the second through hole 21 and the third through hole, the inner wall of the water pump pipe and the second through hole 21 are in close contact.

[0054] The U-shaped opening of the U-shaped cover plate 2 faces the rectangular connecting block 1. Both ends of the U-shaped cover plate 2 are conical. Two locking grooves 9 are opened on the connecting plate 4. Each end of the U-shaped cover plate 2 corresponds to one locking groove 9. The end of the U-shaped cover plate 2 is embedded in the locking groove 9. When using the water pumping pipe connecting device, slide the U-shaped cover plate 2 until the end of the U-shaped cover plate 2 is embedded in the locking groove 9. During the sliding of the U-shaped cover plate 2, the end of the U-shaped cover plate 2 pushes the positioning block 6 into the positioning groove 7 until the end of the U-shaped cover plate 2 is embedded in the locking groove 9. The U-shaped cover plate 2 covers the rectangular connecting block 1, the positioning block 6 is embedded in the positioning groove 7, and at this time the spring 8 is in a stretched state. Then insert the water pumping pipe to pump water.

[0055] When it is necessary to connect the pumping pipe to dewater the well, slide the rectangular connecting block 1 into the mounting groove 5 of the connecting plate 4, and then slide the U-shaped cover plate 2 into it. The U-shaped cover plate 2 pushes the positioning block 6 into the positioning groove 7, and the end of the U-shaped cover plate 2 is then embedded into the locking groove 9. Then, pass the pumping pipe through the U-shaped cover plate 2, the rectangular connecting block 1, and the connecting plate 4 at the same time, and start the gasoline self-priming pump 3 to dewater the well. When it is necessary to repair or remove the pumping pipe connection device, slide the U-shaped cover plate 2 out. At the same time, under the action of the spring 8, the spring 8 pulls out the positioning block 6, and then slide the rectangular connecting block 1 out to repair or remove the pumping pipe connection device.

[0056] Reference Figure 1 After completing the preparations for sealing the dewatering well, stop the gasoline self-priming pump 3 and quickly fix the first steel cover plate in the corresponding position. Weld a steel handle to the steel cover plate to facilitate its installation and positioning inside the well. Then, insert the plastic water suction pipe connected to the gasoline self-priming pump 3, with a nylon filter screen fixed to the end of the pipe. Immediately start the gasoline self-priming pump 3 to pump water, and pour the graded sand, quick-drying cement, grouting liquid, and grouting material into the dewatering well in sequence to slow down the rise in water level. At this time, the water level should have risen back to the bottom plate height and be gushing out in large quantities. When the gasoline self-priming pump 3 starts pumping water again to lower the water level, dynamically adjust the power of the gasoline self-priming pump 3 according to the on-site water flow to ensure that the gasoline self-priming pump 3 can continue to work during welding and avoid the rise in water level affecting the welding. The steel cover plate must be fully welded to the inner wall of the well, with a tight weld and no gaps. After welding, the weld slag should be cleaned in time, and any gaps should be checked and repaired promptly.

[0057] S3. After welding is completed and carefully inspected, stop the gasoline self-priming pump 3 and observe continuously for water seepage from the weld or other areas. If water seepage occurs, mark the seepage point, restart the gasoline self-priming pump 3, and perform repair welding. Repeat the pump stop and observation process several times until it is ensured that no water seepage occurs.

[0058] After ensuring there are no leaks, remove the plastic pumping pipe and stop the water flow, then insert the U-shaped cover plate 2. After the first steel cover plate is used for sealing, pour a layer of micro-expansion concrete to a height of at least 100mm. After sealing, continue to observe the welded joints for leaks. If leaks are found, mark the location, remove the U-shaped cover plate 2, restart the gasoline self-priming pump 3 to lower the water level, and repair the leak by welding. After multiple checks confirm there are no leaks, insert the U-shaped cover plate 2 again.

[0059] S4. After welding the first steel cover plate, micro-expansion concrete needs to be poured on the steel cover plate. The concrete height should not be less than 100mm, and it should be vibrated.

[0060] After the poured concrete has set, the second steel cover plate is welded. Since concrete still needs to be poured on the upper part of the second steel cover plate, when positioning the steel cover plate, a distance of 50mm-60mm should be left between the steel cover plate and the upper opening of the waterproof steel sleeve, so that there is concrete inside the waterproof steel sleeve to press down the second steel cover plate.

[0061] S5. Set up formwork around the perimeter at a distance of 800mm from the outer wall of the waterproof steel sleeve. The height of the formwork should be the height after deducting the ground construction details for that layer.

[0062] After the formwork is erected, anti-seepage concrete is poured around and above the waterproof steel sleeve. The grade of the concrete to be poured is the same as that of the foundation slab, and admixtures (anti-seepage agent and early strength agent) are added. Curing is carried out after pouring.

[0063] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A large-yield dewatering well steel cover plate secondary plugging dewatering construction method, characterized by: Includes the following steps: S1. Determine the location of all dewatering wells according to the construction drawings and prepare all the materials required for construction; S2. Process the first steel cover plate and initially install the first steel cover plate in the dewatering well; S3. Install the pumping pipe connection device on the first steel cover plate, then pass the pumping pipe of the gasoline self-priming pump (3) through the pumping pipe connection device, start the gasoline self-priming pump (3), and start the dewatering of the dewatering well. S4. During the precipitation process, the first steel cover plate is welded immediately. After the precipitation is completed, the pumping pipe is taken out and micro-expansion concrete is poured on the first steel cover plate. S5. After the concrete has set, weld the second steel cover plate. In step S2, during the processing of the first steel cover plate, a steel handle is welded onto the first steel cover plate. In step S3, a nylon filter screen is fixed at the end of the water pump pipe away from the gasoline self-priming pump (3); In step S3, when starting the gasoline self-priming pump (3) to dewater the dewatering well, graded sand and gravel, quick-drying cement, grouting liquid and grouting material are poured into the dewatering well in sequence. In step S4, after the first steel cover plate is welded and carefully inspected, stop the gasoline self-priming pump (3) to pump water and observe at any time whether water seeps out from the weld or other parts. If there is water seepage, mark the seepage location, restart the gasoline self-priming pump (3) to pump water, and perform repair welding. Repeat the pump stop observation several times until it is ensured that no water seeps out. The water pump connection device includes a rectangular connecting block (1) and a U-shaped cover plate (2). The rectangular connecting block (1) is installed on the first steel cover plate, and the U-shaped cover plate (2) covers the rectangular connecting block (1). The rectangular connecting block (1) has a first through hole (11), and the U-shaped cover plate (2) has a second through hole (21). The water pump passes through the first through hole (11) and the second through hole (21) at the same time. The water pump, the rectangular connecting block (1), and the U-shaped cover plate (2) are slidably connected. The gasoline self-priming pump (3) is placed on the outside of the first steel cover plate. A connecting plate (4) is provided between the rectangular connecting block (1) and the first steel cover plate. The connecting plate (4) and the first steel cover plate are fixedly connected. The rectangular connecting block (1) is embedded in the connecting plate (4). The rectangular connecting block (1) and the connecting plate (4) are slidably connected. A third through hole is provided on the connecting plate (4). The water pumping pipe passes through the connecting plate (4). The connecting plate (4) has an installation groove (5) on the side away from the first steel cover plate. One end of the rectangular connecting block (1) is embedded in the installation groove (5). Two positioning blocks (6) are arranged opposite each other in the installation groove (5) of the connecting plate (4). Both positioning blocks (6) are slidably connected to the connecting plate (4). Multiple positioning grooves (7) are opened on the side wall of the rectangular connecting block (1). When the water pumping pipe connection device is used, the positioning block (6) is embedded in the positioning groove (7). When the water pumping pipe connection device is not used, the positioning block (6) is completely detached from the positioning groove (7). A spring (8) is provided between the positioning block (6) and the connecting plate (4). One end of the spring (8) is fixedly connected to the positioning block (6), and the other end of the spring (8) is fixedly connected to the connecting plate (4). When the positioning block (6) is embedded in the positioning groove (7), the spring (8) is in a stretched state. When the spring (8) is in a natural state, the positioning block (6) is completely disengaged from the positioning groove (7). The connecting plate (4) has multiple locking grooves (9). When the water pumping pipe connection device is used, the ends of the U-shaped cover plate (2) are all embedded in the locking grooves (9). At this time, both ends of the U-shaped cover plate (2) are in close contact with the positioning block (6).

Images