Micro-seepage self-drainage structure for drainage plugging of ultrahigh water pressure dewatering well and construction method of micro-seepage self-drainage structure

Abstract

The structure comprises a steel pipe well arranged at a basement dewatering well opening, an upper end opening of the steel pipe well is sealed, a grouting pipe and a water drainage pipe are arranged on the steel pipe well, and the steel pipe well is filled with graded gravel fixedly connected through hardened cement paste. A concrete cushion layer, a waterproof layer and a bottom plate reinforced concrete layer are laid on the basement ground from bottom to top, a bottom plate post-pouring concrete pit is formed in the bottom plate reinforced concrete layer, an upper end opening of the steel pipe well, the grouting pipe and the water drainage pipe are all located in the pit, reinforced concrete is poured in the pit, and a water drainage plate extending to the water collecting well is laid above the pit. And a concrete surface layer is paved above the bottom plate reinforced concrete layer and the drainage plate. The invention further discloses a construction method of the drainage plugging micro-seepage self-drainage structure of the ultrahigh water pressure dewatering well. According to the drainage plugging micro-seepage self-drainage structure of the ultrahigh water pressure dewatering well and the construction method of the drainage plugging micro-seepage self-drainage structure, the well plugging speed is high, the well plugging effect is good, and later unnecessary maintenance is reduced.

Description

Technical Field

[0001] The present invention relates to the field of building construction, in particular to a water-draining, plugging, and micro-seepage self-draining structure for an ultra-high water pressure dewatering well and a construction method thereof. Background Art

[0002] During the construction of a building basement, due to the large area of the basement, a drainage well needs to be set up in the middle of the building basement. The drainage well will be sealed only when the foundation concrete strength reaches the design requirements or the basement foundation meets the anti-floating requirements. However, in ultra-deep basements and when the permeability coefficient of the foundation soil layer is large, the water gushing out of the drainage well is large and the water pressure is high. As long as the water pump stops pumping and the water level has not been taken out, it will return to the drainage well mouth. The drainage well must be sealed with water pressure. Conventional construction methods are not suitable for this situation, which makes it difficult to seal the well and the quality is not easy to guarantee. Sometimes the well sealing will fail. Even if the well is barely sealed successfully, there will be a risk of basement leakage near the drainage well in the later stage, which makes later maintenance more difficult. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a water-draining and plugging micro-seepage self-draining structure for an ultra-high water pressure dewatering well and a construction method thereof, which has a fast well sealing speed, good well sealing effect, and reduces unnecessary later maintenance.

[0004] The ultra-high water pressure dewatering well water-draining plugging and micro-seepage self-draining structure of the present invention comprises a steel pipe well vertically installed at the dewatering wellhead of the basement, the lower port of the steel pipe well being communicated with the dewatering well, the upper port of the steel pipe well being sealed by a plugging member, a grouting pipe and a drainage pipe being arranged on the well wall of the steel pipe well near the upper port, the steel pipe well being filled with graded sand and gravel fixedly connected by hardened cement slurry, a concrete cushion layer, a waterproof layer and a bottom plate reinforced concrete layer being laid in sequence on the ground floor outside the steel pipe well from bottom to top, the concrete cushion layer, the waterproof layer and the bottom plate reinforced concrete layer being all in contact with the outer well wall of the steel pipe well along the circumference of the steel pipe well, the concrete cushion layer and the waterproof layer being The position in contact with the steel pipe well is arranged close to the lower end port of the steel pipe well, the upper surface of the bottom plate reinforced concrete layer is located above the upper end port of the steel pipe well, and a bottom plate post-cast concrete pit corresponding to the steel pipe well is opened on the upper surface of the bottom plate reinforced concrete layer. The upper end port, grouting pipe and drain pipe of the steel pipe well are all located in the bottom plate post-cast concrete pit, reinforced concrete is poured in the bottom plate post-cast concrete pit, and the concrete strength in the bottom plate post-cast concrete pit is one level higher than the concrete strength of the bottom plate reinforced concrete layer. A drainage board extending to the water collection well is laid above the bottom plate post-cast concrete pit, and a concrete surface layer is laid above the bottom plate reinforced concrete layer and the drainage board.

[0005] The ultra-high water pressure dewatering well drainage plugging micro-seepage self-draining structure in the present invention, wherein the steel pipe well includes an upper part of the steel pipe well and a lower part of the steel pipe well both arranged vertically. An annular support plate arranged circumferentially is fixedly provided on the outer well wall at the lower port of the lower part of the steel pipe well. The annular support plate is circumferentially lapped on the edge of the dewatering well opening. The lower port of the lower part of the steel pipe well communicates with the dewatering well. The upper port of the lower part of the steel pipe well is connected to the lower port of the upper part of the steel pipe well through a flange for extension. The upper port of the upper part of the steel pipe well is sealed by a plugging member. A grouting pipe and a drain pipe are provided on the well wall of the upper part of the steel pipe well near the upper port. An annular water stop plate arranged circumferentially is fixedly provided on the outer well wall of the upper part of the steel pipe well.

[0006] The ultra-high water pressure dewatering well drainage plugging micro-seepage self-draining structure in the present invention, wherein the plugging member includes a well sealing flange, a well sealing flange cover and a locking member. The well sealing flange is fixedly provided at the upper port of the upper part of the steel pipe well. The well sealing flange cover is rotatably installed on the well sealing flange through a vertically arranged hinge shaft. The well sealing flange cover and the well sealing flange are fixedly connected by bolts. The locking member includes a handle fixedly provided on the well sealing flange cover and a clamping groove fixedly provided on the well sealing flange. The handle is clamped in the clamping groove. A rubber water stop pad is provided between the well sealing flange cover and the well sealing flange.

[0007] In the ultra-high water pressure dewatering well drainage plugging micro-seepage self-draining structure in the present invention, a bottom plate is fixedly provided on the well sealing flange. A vertical plate is fixedly provided on the bottom plate. A top plate arranged opposite to the bottom plate is fixedly provided on the vertical plate. The handle is clamped between the bottom plate, the vertical plate and the top plate. The bottom plate, the vertical plate and the top plate together form the clamping groove.

[0008] The construction method of the above ultra-high water pressure dewatering well drainage plugging micro-seepage self-draining structure in the present invention includes the following steps:

[0009] First step: Prepare the steel pipe well. Drill a grouting hole and a drain hole on the well wall of the steel pipe well near the upper port. Weld a grouting pipe at the grouting hole on the outer well wall of the steel pipe well. Weld a drain pipe at the drain hole on the outer well wall of the steel pipe well. Install a grouting valve on the grouting pipe. Install a drain valve on the drain pipe. Connect a drainage hose to the drain valve. Install a plugging member at the upper port of the steel pipe well.

[0010] Second step: Arrange the steel pipe well vertically and place the lower port of the steel pipe well at the well opening of the dewatering well. Then, lay a concrete cushion and a waterproof layer on the basement floor around the steel pipe well from bottom to top in sequence. Make both the concrete cushion and the waterproof layer in circumferential contact with the outer well wall of the steel pipe well. Thicken the part of the concrete cushion in contact with the steel pipe well. Arrange the positions of the concrete cushion and the waterproof layer in contact with the steel pipe well close to the lower port of the steel pipe well.

[0011] Step 3: Install the bottom slab steel bars on the waterproof layer, and reserve a post-cast concrete pit for the bottom slab at the upper port of the steel pipe well, so that the upper port of the steel pipe well and the sealing member, grouting pipe, grouting valve, drain pipe, drain valve and drainage hose thereon are all located in the post-cast concrete pit for the bottom slab. Pour the bottom slab concrete to cover the bottom slab steel bars to form a bottom slab reinforced concrete layer, make the bottom slab reinforced concrete layer contact the outer well wall of the steel pipe well circumferentially, and make the upper surface of the bottom slab reinforced concrete layer higher than the upper port of the steel pipe well.

[0012] Step 4: Connect the drainage hose to the sump, open the drain valve, remove the sealing member from the upper port of the steel pipe well, and fill graded sand and gravel into the steel pipe well from the upper port of the steel pipe well until the top of the steel pipe well. During this process, the water in the steel pipe well is discharged into the sump through the drain pipe, drain valve and drainage hose in sequence. After the graded sand and gravel settle and consolidate, move the sealing member to the upper port of the steel pipe well to seal it, and then close the drain valve and remove the drainage hose.

[0013] Step 5: Open the grouting valve, inject a certain amount of quick-setting cement slurry into the steel pipe well through the grouting pipe, then close the grouting valve. Next, install steel bars in the post-cast concrete pit for the bottom slab, and pour concrete with a strength one grade higher than that of the bottom slab concrete into the post-cast concrete pit for the bottom slab.

[0014] Step 6: Lay a drainage board extending to the sump above the post-cast concrete pit for the bottom slab, and then lay a concrete surface layer above the bottom slab reinforced concrete layer and the drainage board.

[0015] In the construction method of the present invention, in the first step, the specific steps for preparing the steel pipe well are as follows:

[0016] Prepare the upper part and the lower part of the steel pipe well. Weld a circumferentially arranged annular water stop plate on the outer well wall of the upper part of the steel pipe well, and weld a circumferentially arranged annular support plate on the outer well wall of the lower port of the lower part of the steel pipe well. Connect the lower port of the upper part of the steel pipe well and the upper port of the lower part of the steel pipe well through a connecting flange to form the steel pipe well. The upper port of the upper part of the steel pipe well is the upper port of the steel pipe well, and the lower port of the lower part of the steel pipe well is the lower port of the steel pipe well.

[0017] In the construction method of the present invention, in the first step, the specific steps for installing a sealing member at the upper port of the steel pipe well are as follows:

[0018] The plugging member adopts a well-sealing flange, a well-sealing flange cover and a locking member. The well-sealing flange is welded to the upper port at the upper part of the steel pipe well. The well-sealing flange cover is rotatably installed on the well-sealing flange through a vertically arranged hinge shaft. A rubber water stop pad is bonded to the side of the well-sealing flange opposite to the well-sealing flange cover. The locking member adopts a handle and a clamping groove. The handle is welded to the well-sealing flange cover, and the clamping groove is fixedly arranged on the well-sealing flange. The well-sealing flange cover is rotated through the handle. When the handle rotates into the clamping groove and is clamped with the clamping groove, the well-sealing flange cover is aligned with the well-sealing flange. Then, the well-sealing flange cover and the well-sealing flange are fixedly connected through bolts.

[0019] In the construction method of the present invention, in the first step, the specific steps of fixedly arranging the clamping groove on the well-sealing flange are as follows:

[0020] A bottom plate is welded on the well-sealing flange, a vertical plate is welded on the bottom plate, and a top plate opposite to the bottom plate is welded on the vertical plate. The bottom plate, the vertical plate and the top plate together form the clamping groove.

[0021] In the construction method of the present invention, in the second step, the specific steps of placing the lower port of the steel pipe well at the wellhead of the dewatering well are as follows: Align the lower port at the lower part of the steel pipe well with the wellhead of the dewatering well, and let the annular support plate be circumferentially lapped on the edge of the dewatering wellhead.

[0022] In the construction method of the present invention, in the fourth step, the specific steps of removing the plugging member from the upper port of the steel pipe well are as follows: Remove the bolts between the well-sealing flange cover and the well-sealing flange, rotate the well-sealing flange cover through the handle, let the handle rotate out of the clamping groove, and continue to rotate the well-sealing flange cover until the well-sealing flange cover is removed from the upper port at the upper part of the steel pipe well.

[0023] In the fourth step, the specific steps of moving the plugging member to the upper port of the steel pipe well to seal it are as follows: Rotate the well-sealing flange cover through the handle. When the handle rotates into the clamping groove and is clamped with the clamping groove, the well-sealing flange cover is aligned with the well-sealing flange. Then, the well-sealing flange cover and the well-sealing flange are fixedly connected through bolts.

[0024] The difference between the present invention and the prior art is that the present invention adds a water drainage device to the steel pipe well. During well sealing, water is drained through the water drainage device, and the well is sealed by draining water and reducing pressure, realizing rapid pressure sealing of the well. After the well sealing is completed, the water drainage device is closed; in the steel pipe well, the technology of first filling graded sand and then grouting is adopted instead of concrete to ensure the density and filling quality of the filling in the well; drainage plates are placed in the concrete surface layer to a nearby catch basin, and a micro-seepage self-draining process is added. Utilizing the micro-leakage self-healing function of the concrete can reduce unnecessary later maintenance. It can be seen that the well sealing speed of the present invention is fast, the well sealing effect is good, and unnecessary later maintenance is reduced.

[0025] The present invention will be further described below with reference to the accompanying drawings. Description of the Drawings

[0026] Figure 1 This is a schematic structural diagram of the water drainage plugging and slightly permeable self-draining structure of the ultra-high water pressure dewatering well in the present invention;

[0027] Figure 2 This is a top view of the locking member in the present invention;

[0028] Figure 3 This is a side view of the locking member in the present invention;

[0029] Figure 4 This is a flow chart of the construction method of the water drainage plugging and slightly permeable self-draining structure of the ultra-high water pressure dewatering well in the present invention.

[0030] In the figure:

[0031] 1, Concrete surface layer; 2, Drainage board; 3, Bottom slab reinforced concrete layer; 4, Waterproof layer; 5, Concrete cushion; 6, Dewatering well; 7, Annular support plate; 8, Lower part of steel pipe well; 9, Connecting flange; 10, Annular water stop plate; 11, Upper part of steel pipe well; 12, Grouting pipe; 13, Grouting valve; 14, Steel wire mesh; 15, Drainage pipe; 16, Drainage valve; 17, Drainage hose; 18, Sump; 19, Well-sealing flange; 20, Well-sealing flange cover; 21, Hinge shaft; 22, Rubber water stop pad; 23, Handle; 24, Bottom slab; 25, Vertical plate; 26, Post-cast concrete pit of bottom slab; 27, Roof slab; 28, Steel pipe well; 29, Card slot. Detailed implementation manners

[0032] As Figure 1 shown, and in combination with Figure 2 、 3As shown in the figure, the ultra-high water pressure dewatering well drainage plugging and micro-seepage self-draining structure in the present invention includes steel pipe wells 28 vertically installed at 6 dewatering wells in the basement. The lower port of the steel pipe well 28 communicates with the dewatering well 6. The upper port of the steel pipe well 28 is sealed by a plugging member. A grouting pipe 12 and a drain pipe 15 are provided on the well wall of the steel pipe well 28 near the upper port. The steel pipe well 28 is filled with graded sand and gravel fixedly connected by hardened cement slurry. On the basement floor outside the steel pipe well 28, a concrete cushion 5, a waterproof layer 4, and a floor reinforced concrete layer 3 are laid in sequence from bottom to top. The concrete cushion 5, the waterproof layer 4, and the floor reinforced concrete layer 3 are all in contact with the outer well wall of the steel pipe well 28 along the circumferential direction of the steel pipe well 28. The positions of the concrete cushion 5 and the waterproof layer 4 in contact with the steel pipe well 28 are arranged near the lower port of the steel pipe well 28. Since the floor reinforced concrete layer 3 is laid above the waterproof layer 4, the lower surface of the floor reinforced concrete layer 3 in contact with the steel pipe well 28 is also arranged near the lower port of the steel pipe well 28. The upper surface of the floor reinforced concrete layer 3 is located above the upper port of the steel pipe well 28. A floor post-cast concrete pit 26 corresponding to the steel pipe well 28 is provided on the upper surface of the floor reinforced concrete layer 3. The upper port of the steel pipe well 28, the grouting pipe 12, and the drain pipe 15 are all located in the floor post-cast concrete pit 26. Reinforced concrete is poured in the floor post-cast concrete pit 26. The concrete strength in the floor post-cast concrete pit 26 is one grade higher than the concrete strength of the floor reinforced concrete layer 3. A drainage board 2 extending to the sump 18 is laid above the floor post-cast concrete pit 26. A concrete surface layer 1 is laid above the floor reinforced concrete layer 3 and the drainage board 2.

[0033] A grouting valve 13 is installed on the grouting pipe 12, and the grouting valve 13 is in a closed state; a drain valve 16 is installed on the drain pipe 15, and the drain valve 16 is in a closed state.

[0034] As Figure 1 As shown in the figure, in the ultra-high water pressure dewatering well drainage plugging and micro-seepage self-draining structure in the present invention, the steel pipe well 28 includes an upper part 11 of the steel pipe well and a lower part 8 of the steel pipe well both arranged vertically. An annular support plate 7 arranged circumferentially is fixedly provided on the outer well wall of the lower port of the lower part 8 of the steel pipe well. The annular support plate 7 is circumferentially lapped on the edge of the 6 dewatering wells. The lower port of the lower part 8 of the steel pipe well communicates with the dewatering well 6. The upper port of the lower part 8 of the steel pipe well is connected to the lower port of the upper part 11 of the steel pipe well through a connecting flange 9. The upper port of the upper part 11 of the steel pipe well is sealed by a plugging member. A grouting pipe 12 and a drain pipe 15 are provided on the well wall of the upper part 11 of the steel pipe well near the upper port. An annular water stop plate 10 arranged circumferentially is fixedly provided on the outer well wall of the upper part 11 of the steel pipe well.

[0035] The annular support plate 7 is made of steel plate and is fixed on the lower part 8 of the steel pipe well by welding. The annular water stop plate 10 is also made of steel plate and is also fixed on the upper part 11 of the steel pipe well by welding. The annular water stop plate 10 is a prior art, which waterproofs by increasing the water flow path of the outer well wall of the upper part 11 of the steel pipe well. Its specific structure and working principle will not be elaborated here.

[0036] The upper part 11 and the lower part 8 of the steel pipe well are coaxially connected up and down through the connection flange 9 to form the steel pipe well 28. The upper port of the upper part 11 of the steel pipe well is the upper port of the steel pipe well 28, and the lower port of the lower part 8 of the steel pipe well is the lower port of the steel pipe well 28. The concrete cushion 5 and the waterproof layer 4 are both in contact with the outer well wall of the lower part 8 of the steel pipe well along the circumferential direction of the lower part 8 of the steel pipe well, so that the positions where the concrete cushion 5 and the waterproof layer 4 are in contact with the steel pipe well 28 can be arranged close to the lower port of the steel pipe well 28. The bottom slab reinforced concrete layer 3 is in contact with the outer well walls of the upper part 11 and the lower part 8 of the steel pipe well along the circumferential direction of the upper part 11 and the lower part 8 of the steel pipe well at the same time. The lower surface of the bottom slab reinforced concrete layer 3 is in contact with the outer well wall of the lower part 8 of the steel pipe well, so that the lower surface of the bottom slab reinforced concrete layer 3 in contact with the steel pipe well 28 can be arranged close to the lower port of the steel pipe well 28, and the upper surface of the bottom slab reinforced concrete layer 3 is located above the upper port of the upper part 11 of the steel pipe well.

[0037] In order to enhance the connection sealing performance between the upper part 11 and the lower part 8 of the steel pipe well, a rubber waterproof cushion can be arranged between the connection flanges 9.

[0038] Combined Figure 2 、 3 As shown in

[0039] The articulated shaft 21 can be a bolt. The articulated shaft 21 is welded vertically on the well-sealing flange 19. The well-sealing flange cover 20 is rotatably installed on the well-sealing flange 19 through the articulated shaft 21. The well-sealing flange cover 20 is located above the well-sealing flange 19. Since the articulated shaft 21 is arranged vertically, when the well-sealing flange cover 20 rotates around the articulated shaft 21, the well-sealing flange cover 20 rotates horizontally. The well-sealing flange cover 20 can be rotated by holding the handle 23. When the handle 23 is rotated towards the card slot 29, the well-sealing flange cover 20 also rotates accordingly. When the handle 23 rotates into the card slot 29, the handle 23 is clamped with the card slot 29. At the same time, the well-sealing flange cover 20 and the well-sealing flange 19 are aligned vertically, and their bolt holes are also aligned vertically. Then, the two can be fixedly connected by bolts, so that the well-sealing flange cover 20 seals the upper port of the upper part 11 of the steel pipe well, realizing the sealing of the upper port. On the contrary, when the bolts between the well-sealing flange cover 20 and the well-sealing flange 19 are removed and the handle 23 is turned out of the card slot 29 until the handle 23 drives the well-sealing flange cover 20 to rotate to the outside of the upper part 11 of the steel pipe well, the upper port of the upper part 11 of the steel pipe well can be exposed again.

[0040] The rubber water stop pad 22 is bonded to the well-sealing flange 19, specifically bonded to the side surface of the well-sealing flange 19 opposite to the well-sealing flange cover 20, which can further enhance the sealing performance between the well-sealing flange cover 20 and the well-sealing flange 19.

[0041] Combined Figure 2 、 3 As shown, in the ultra-high water pressure dewatering well drainage plugging and micro-seepage self-draining structure of the present invention, a bottom plate 24 is fixedly provided on the well-sealing flange 19 by welding, a vertical plate 25 is fixedly provided on the bottom plate 24 by welding, and a top plate 27 arranged opposite to the bottom plate 24 is fixedly provided on the vertical plate 25 by welding. The handle 23 is clamped between the bottom plate 24, the vertical plate 25 and the top plate 27. The bottom plate 24, the vertical plate 25 and the top plate 27 together form the card slot 29. The bottom plate 24, the vertical plate 25 and the top plate 27 together form a U-shaped groove, which is the card slot 29. When the handle 23 enters the card slot 29, the clamping with the card slot 29 can be realized.

[0042] As Figure 4 shown, and combined Figures 1-3 shown, the construction method of the above ultra-high water pressure dewatering well drainage plugging and micro-seepage self-draining structure in the present invention includes the following steps:

[0043] Step 1: Prepare the steel pipe well 28. Open grouting holes and drain holes on the well wall of the steel pipe well 28 near the upper port. Weld the grouting pipe 12 at the grouting hole on the outer well wall of the steel pipe well 28, weld the drain pipe 15 at the drain hole on the outer well wall of the steel pipe well 28, install a grouting valve 13 on the grouting pipe 12, install a drain valve 16 on the drain pipe 15, connect a drainage hose 17 to the drain valve 16, and install a plugging member at the upper port of the steel pipe well 28.

[0044] Step 2: Arrange the steel pipe well 28 vertically and place the lower port of the steel pipe well 28 at the wellhead of the dewatering well 6. Then, sequentially lay a concrete cushion 5 and a waterproof layer 4 on the basement floor outside the steel pipe well 28 from bottom to top, making both the concrete cushion 5 and the waterproof layer 4 in circumferential contact with the outer well wall of the steel pipe well 28, and thickening the part of the concrete cushion 5 in contact with the steel pipe well 28. Arrange the positions of the concrete cushion 5 and the waterproof layer 4 in contact with the steel pipe well 28 close to the lower port of the steel pipe well 28.

[0045] Step 3: Install the bottom plate steel bars on the waterproof layer 4 and reserve a post-cast concrete pit 26 for the bottom plate at the upper port of the steel pipe well 28, making the upper port of the steel pipe well 28 and the plugging member, grouting pipe 12, grouting valve 13, drain pipe 15, drain valve 16, and drainage hose 17 all located in the post-cast concrete pit 26 for the bottom plate. Pour the bottom plate concrete to form a bottom plate reinforced concrete layer 3 covering the bottom plate steel bars, making the bottom plate reinforced concrete layer 3 in circumferential contact with the outer well wall of the steel pipe well 28, and ensuring that the upper surface of the bottom plate reinforced concrete layer 3 is higher than the upper port of the steel pipe well 28.

[0046] Step 4: Connect the drainage hose 17 to the sump 18, open the drain valve 16, remove the plugging member from the upper port of the steel pipe well 28, and fill graded sand and gravel into the steel pipe well 28 from the upper port until the top of the steel pipe well 28. During this process, the water in the steel pipe well 28 is discharged into the sump 18 through the drain pipe 15, drain valve 16, and drainage hose 17 in sequence. After the graded sand and gravel settle and consolidate, move the plugging member to the upper port of the steel pipe well 28 to seal it, then close the drain valve 16 and remove the drainage hose 17.

[0047] Step 5: Open the grouting valve 13 and inject a certain amount of quick-setting cement slurry into the steel pipe well 28 through the grouting pipe 12, then close the grouting valve 13. Next, install steel bars in the post-cast concrete pit 26 for the bottom plate and pour concrete with a strength one grade higher than that of the bottom plate concrete into the post-cast concrete pit 26 for the bottom plate.

[0048] Step 6: Lay a drainage board 2 extending to the sump 18 above the post-cast concrete pit 26 for the bottom plate, and then lay a concrete surface layer 1 above the bottom plate reinforced concrete layer 3 and the drainage board 2.

[0049] The construction method in the present invention, in which in the first step, the specific steps for preparing the steel pipe well 28 are as follows:

[0050] Prepare the upper part 11 of the steel pipe well and the lower part 8 of the steel pipe well. Weld the circumferentially arranged annular water stop plate 10 on the outer well wall of the upper part 11 of the steel pipe well. Weld the circumferentially arranged annular support plate 7 on the outer well wall of the lower port of the lower part 8 of the steel pipe well. Connect the lower port of the upper part 11 of the steel pipe well and the upper port of the lower part 8 of the steel pipe well through the connection flange 9 to form the steel pipe well 28. The upper port of the upper part 11 of the steel pipe well is the upper port of the steel pipe well 28, and the lower port of the lower part 8 of the steel pipe well is the lower port of the steel pipe well 28.

[0051] Open a grouting hole and a drain hole on the well wall of the upper part 11 of the steel pipe well near the upper port. Both the grouting pipe 12 and the drain pipe 15 are welded on the upper part 11 of the steel pipe well.

[0052] The construction method in the present invention, in which in the first step, the specific steps for installing the sealing member at the upper port of the steel pipe well 28 are as follows:

[0053] The sealing member adopts a well sealing flange 19, a well sealing flange cover 20 and a locking member. Weld the well sealing flange 19 on the upper port of the upper part 11 of the steel pipe well. Rotationally install the well sealing flange cover 20 on the well sealing flange 19 through the vertically arranged hinge shaft 21. Bond the rubber water stop pad 22 on the side of the well sealing flange 19 opposite to the well sealing flange cover 20. The locking member adopts a handle 23 and a clamping groove 29. Weld the handle 23 on the well sealing flange cover 20. Fix the clamping groove 29 on the well sealing flange 19. Rotate the well sealing flange cover 20 through the handle 23. When the handle 23 rotates into the clamping groove 29 and is clamped with the clamping groove 29, the well sealing flange cover 20 is aligned with the well sealing flange 19. Then, fixedly connect the well sealing flange cover 20 and the well sealing flange 19 through bolts.

[0054] The construction method in the present invention, in which in the first step, the specific steps for fixedly installing the clamping groove 29 on the well sealing flange 19 are as follows:

[0055] Weld the bottom plate 24 on the well sealing flange 19. Weld the vertical plate 25 on the bottom plate 24. Weld the top plate 27 arranged opposite to the bottom plate 24 on the vertical plate 25. Let the bottom plate 24, the vertical plate 25 and the top plate 27 jointly form the clamping groove 29.

[0056] The construction method in the present invention, in which in the second step, the specific steps for placing the lower port of the steel pipe well 28 at the wellhead of the dewatering well 6 are as follows: Align the lower port of the lower part 8 of the steel pipe well with the wellhead of the dewatering well 6, and let the annular support plate 7 circumferentially overlap on the edge of the dewatering well 6 opening.

[0057] The construction method in the present invention, in the second step, the steel pipe well 28 is arranged vertically, that is, both the upper part 11 of the steel pipe well and the lower part 8 of the steel pipe well are arranged vertically, and the upper part 11 of the steel pipe well is located above the lower part 8 of the steel pipe well.

[0058] In the second step, when the concrete cushion layer 5 and the waterproof layer 4 are sequentially laid from bottom to top on the basement floor around the steel pipe well 28, the concrete cushion layer 5 and the waterproof layer 4 are in circumferential contact with the outer well wall of the lower part 8 of the steel pipe well, and the part of the concrete cushion layer 5 in contact with the lower part 8 of the steel pipe well is thickened. Since both the concrete cushion layer 5 and the waterproof layer 4 are in contact with the lower part 8 of the steel pipe well, it can be realized that the positions of the concrete cushion layer 5 and the waterproof layer 4 in contact with the steel pipe well 28 are arranged close to the lower port of the steel pipe well 28.

[0059] The construction method in the present invention, in the third step, a post-cast concrete pit 26 for the floor slab is reserved at the upper port of the upper part 11 of the steel pipe well, and the upper port of the upper part 11 of the steel pipe well and the plugging member, grouting pipe 12, grouting valve 13, drain pipe 15, drain valve 16 and drainage hose 17 thereon are all located in the post-cast concrete pit 26 for the floor slab.

[0060] In the third step, after the floor slab reinforced concrete layer 3 is formed, since the floor slab reinforced concrete layer 3 is laid on the waterproof layer 4, and the position of the waterproof layer 4 in contact with the steel pipe well 28 is arranged close to the lower port of the steel pipe well 28, the position of the lower surface of the floor slab reinforced concrete layer 3 in contact with the steel pipe well 28 is also arranged close to the lower port of the steel pipe well 28. The floor slab reinforced concrete layer 3 is in circumferential contact with the outer well walls of both the upper part 11 and the lower part 8 of the steel pipe well, and the lower surface of the floor slab reinforced concrete layer 3 is in contact with the lower part 8 of the steel pipe well, so it can be realized that the position of the lower surface of the floor slab reinforced concrete layer 3 in contact with the steel pipe well 28 is arranged close to the lower port of the steel pipe well 28. The upper surface of the floor slab reinforced concrete layer 3 is higher than the upper port of the upper part 11 of the steel pipe well.

[0061] The construction method in the present invention, in the fourth step, the specific steps for removing the plugging member from the upper port of the steel pipe well 28 are: removing the bolts between the well-sealing flange cover 20 and the well-sealing flange 19, rotating the well-sealing flange cover 20 through the handle 23, so that the handle 23 rotates out of the card slot 29, and continuing to rotate the well-sealing flange cover 20 until the well-sealing flange cover 20 is removed from the upper port of the upper part 11 of the steel pipe well.

[0062] After the well-sealing flange cover 20 is removed, graded sand and gravel can be filled into the steel pipe well 28 from the upper port of the upper part 11 of the steel pipe well until the top of the steel pipe well 28.

[0063] In the fourth step, the specific steps of moving the plugging member to the upper port of the steel pipe well 28 for sealing are as follows: Rotate the well-sealing flange cover 20 through the handle 23. When the handle 23 rotates into and engages with the clamping groove 29, the well-sealing flange cover 20 is aligned with the well-sealing flange 19. Then, fix and connect the well-sealing flange cover 20 and the well-sealing flange 19 with bolts.

[0064] Sealing the upper port of the steel pipe well 28 is to seal the upper port of the upper part 11 of the steel pipe well.

[0065] In the fourth step, when filling graded sand and gravel into the steel pipe well 28, since the lower port of the steel pipe well 28 is communicated with the dewatering well 6, the graded sand and gravel first fills the dewatering well 6, and then fills the steel pipe well 28.

[0066] In the fifth step, injecting a certain amount of quick-setting cement slurry into the steel pipe well 28 means injecting quick-setting cement slurry equal to the volume of the steel pipe well 28 into the steel pipe well 28. After the quick-setting cement slurry hardens, it can fixedly connect the graded sand and gravel in the dewatering well 6 and the steel pipe well 28 into one body. At this time, it can be said that the steel pipe well 28 is filled with graded sand and gravel fixedly connected by the hardened cement slurry.

[0067] Both the upper part 11 of the steel pipe well and the lower part 8 of the steel pipe well are steel pipes with a diameter of 300 mm. The connecting flange 9 includes a first connecting flange and a second connecting flange. The first connecting flange is fixedly arranged at the lower port of the upper part 11 of the steel pipe well, and the second connecting flange is fixedly arranged at the upper port of the lower part 8 of the steel pipe well. When connecting the upper part 11 and the lower part 8 of the steel pipe well through the connecting flange 9, align the lower port of the upper part 11 of the steel pipe well with the upper port of the lower part 8 of the steel pipe well, and also align the bolt holes of the first connecting flange and the second connecting flange. Then, connect the first connecting flange and the second connecting flange with bolts to connect the upper part 11 and the lower part 8 of the steel pipe well to form the steel pipe well 28.

[0068] The specific structure of the upper part 11 of the steel pipe well is: A first connecting flange is welded at the bottom (i.e., the lower port) of the upper part 11 of the steel pipe well, a circular water stop plate 10 is welded in the middle, a well-sealing flange 19 and a grouting pipe 12 and a drain pipe 15 closely below it are welded at the top.

[0069] The specific structure of the lower part 8 of the steel pipe well is: A circular support plate 7 is welded at a position close to the lower port of the lower part 8 of the steel pipe well, and a second connecting flange is welded at the top (i.e., the upper port).

[0070] The well-sealing flange 19 is welded to the upper port of the upper part 11 of the steel pipe well. A vertically arranged hinge shaft 21 (the hinge shaft 21 can be a bolt) is welded to the well-sealing flange 19. The well-sealing flange cover 20 is rotatably installed on the well-sealing flange 19 through the hinge shaft 21, that is, the well-sealing flange cover 20 is located above the well-sealing flange 19 and also above the upper port of the upper part 11 of the steel pipe well. Since the hinge shaft 21 is vertically arranged, when the well-sealing flange cover 20 is rotated by the handle 23, the well-sealing flange cover 20 rotates around the hinge shaft 21 and in the horizontal direction. Through pre-adjustment, when the handle 23 is rotated into the card slot 29 and engages with the card slot 29, the well-sealing flange cover 20 is just aligned with the well-sealing flange 19 up and down, and the bolt holes on the well-sealing flange cover 20 and the well-sealing flange 19 are also just aligned up and down. At this time, the well-sealing flange cover 20 and the well-sealing flange 19 can be connected by bolts, so that the well-sealing flange cover 20 blocks the upper port of the upper part 11 of the steel pipe well, that is, the upper port of the steel pipe well 28. Of course, when it is necessary to move the well-sealing flange cover 20 away from the upper port of the upper part 11 of the steel pipe well, remove the bolts, rotate the well-sealing flange cover 20 by the handle 23, so that the handle 23 rotates out of the card slot 29, and continue to rotate the well-sealing flange cover 20 until the well-sealing flange cover 20 rotates to the outside of the upper part 11 of the steel pipe well, exposing the upper port of the upper part 11 of the steel pipe well.

[0071] The bottom plate 24 is welded to the well-sealing flange 19. The bottom plate 24, the vertical plate 25 and the top plate 27 are all made of 10-mm-thick steel plates. The bottom plate 24, the vertical plate 25 and the top plate 27 jointly enclose a U-shaped groove, which is the card slot 29. When the handle 23 rotates into the card slot 29, it is considered that the handle 23 is engaged in the card slot 29. At this time, due to the block of the card slot 29 on the handle 23, since the handle 23 is welded to the well-sealing flange cover 20, the block of the card slot 29 on the handle 23 is also the block on the well-sealing flange cover 20. Due to this blocking effect, the water in the steel pipe well 28 cannot push open the well-sealing flange cover 20, which can achieve rapid sealing and facilitate the subsequent use of bolts to further fix the well-sealing flange cover 20 and the well-sealing flange 19.

[0072] In order to achieve better sealing of the upper port of the upper part 11 of the steel pipe well by the well-sealing flange cover 20, after the well-sealing flange cover 20 is rotatably installed on the well-sealing flange 19 through the vertically arranged hinge shaft 21, a rubber water stop pad 22 is bonded to the side of the well-sealing flange 19 opposite to the well-sealing flange cover 20, which can further enhance the sealing performance between the well-sealing flange cover 20 and the well-sealing flange 19.

[0073] The drain pipe 15, the drain valve 16 and the drain hose 17 form a drainage device. One end of the drain pipe 15 is welded at the drain hole on the outer well wall of the upper part 11 of the steel pipe well. The other end of the drain pipe 15 is connected to one end of the drain valve 16 by screw threads. The other end of the drain valve 16 is connected to one end of the drain hose 17. The other end of the drain hose 17 extends into the sump 18. In order to prevent graded sand and gravel from entering the drain pipe 15, a steel wire mesh 14 is welded at the drain hole on the inner side of the upper part 11 of the steel pipe well.

[0074] The grouting pipe 12 and the grouting valve 13 form a grouting device. One end of the grouting pipe 12 is welded at the grouting hole on the outer well wall of the upper part 11 of the steel pipe well. The other end of the grouting pipe 12 is connected to the grouting valve 13 by screw threads.

[0075] The drainage device and the grouting device are in a straight line, that is, the drainage device and the grouting device are respectively arranged on the opposite sides of the upper part 11 of the steel pipe well. The hinge shaft 21 and the locking member are also in a straight line, that is, the hinge shaft 21 and the locking member are respectively arranged on the opposite sides of the well sealing flange cover 20. When turning the handle 23 to make the well sealing flange cover 20 rotate, in order to prevent the drainage device and the grouting device from interfering with the rotation of the handle 23, the above two straight lines can be perpendicular to each other.

[0076] The concrete cushion 5 at the wellhead of the dewatering well 6 is locally thickened to facilitate the fixation of the lower part 8 of the steel pipe well. The lower part 8 of the steel pipe well is placed on the wellhead of the dewatering well 6, so that the annular support plate 7 covers the wellhead of the dewatering well 6 to prevent concrete from falling in, and then the concrete cushion 5 is constructed. The waterproof layer 4 is constructed and effectively connected to the lower part 8 of the steel pipe well to prevent water leakage. While installing the bottom slab steel bars, the upper part 11 of the steel pipe well is installed through the connecting flange 9 at an appropriate time and reinforced with the bottom slab steel bars. Part of the bottom slab steel bars can support the steel pipe well 28 to prevent displacement during the pouring of the bottom slab concrete.

[0077] In order to reserve a post-cast concrete pit 26 for the bottom slab above the upper part 11 of the steel pipe well, after installing the bottom slab steel bars, a cutting tool can be used to cut out the post-cast concrete pit 26 on the bottom slab steel bars, and the cut steel bars are placed for later use. When pouring the bottom slab concrete, baffles can be respectively fixed on the side wall and the bottom wall of the post-cast concrete pit 26 of the bottom slab to prevent the bottom slab concrete from flowing into the post-cast concrete pit 26 of the bottom slab. After the bottom slab concrete solidifies, the baffles are removed, thus forming the post-cast concrete pit 26 of the bottom slab.

[0078] After the bottom slab concrete reaches the design strength, to reduce the dewatering cost, the dewatering well 6 can be sealed. Extend one end of the drainage hose 17 away from the steel pipe well 28 to the sump 18, and open the drain valve 16. Fill graded sand and gravel into the steel pipe well 28 until the top of the steel pipe well 28. During this process, the water in the steel pipe well 28 is discharged into the sump 18 through the drainage device. After the graded sand and gravel settle and consolidate, turn the sealing well flange cover 20 through the handle 23, quickly turn the handle 23 into the clamping groove 29 and engage with the clamping groove 29, so that the bolt holes on the sealing well flange cover 20 and the sealing well flange 19 are aligned vertically. Install bolts and tighten each bolt one by one. At this time, the water still drains through the drainage device. After checking that all bolts are tightened again, close the drain valve 16. After checking that there is no water leakage or air leakage between the sealing well flange cover 20 and the sealing well flange 19, remove the drainage hose 17.

[0079] If there are two or more dewatering wells 6 in the basement, after all the dewatering wells 6 are blocked in the above manner, after the groundwater has no flowing water, under the static water pressure, perform pressure grouting on the steel pipe well 28 through the grouting pipe 12 to prevent the grout from being carried away by the underground flowing water. After checking that there is no water leakage or air leakage between the sealing well flange cover 20 and the sealing well flange 19, start grouting. The grout is quick-setting cement slurry, and the grouting pressure should be greater than 1.3 times the static water pressure of the groundwater at this time. When the pressure of the grouting pump reaches the grouting pressure, slowly open the grouting valve 13. When the grouting volume reaches the volume of the steel pipe well 28, stop grouting and close the grouting valve 13. It should be noted that the grouting should be carried out slowly. Clean the post-cast concrete pit 26 on the bottom slab, remove the rust from the steel bars cut when reserving the post-cast concrete pit 26 on the bottom slab, and also remove the rust from the steel pipe well 28 located in the post-cast concrete pit 26 on the bottom slab. Weld the steel bars at the post-cast concrete pit 26 on the bottom slab, and pour the post-cast concrete pit 26 on the bottom slab with micro-expansion concrete one grade higher than the strength of the bottom slab concrete.

[0080] Check whether there is any leakage around the post-cast concrete pit 26 on the bottom slab, that is, check whether there is a gap between the reinforced concrete in the pit and the original bottom slab reinforced concrete layer 3. If there is a gap, inject polyurethane foam into the gap until there is no leakage. Place the drainage board 2 to the sump 18. The drainage board 2 and the post-cast concrete pit 26 on the bottom slab should overlap by no less than 500 mm, and ensure that the drainage channel is unobstructed. Then pour the concrete surface layer 1.

[0081] The difference between the present invention and the prior art is that the present invention adds a drainage device to the steel pipe well 28. During well sealing, drainage is carried out through the drainage device, and the drainage and pressure reduction well sealing method is adopted to achieve rapid pressurized well sealing. After the well sealing is completed, the drainage device is closed; in the steel pipe well 28, the technology of first filling graded sand and gravel and then grouting is used instead of concrete to ensure the density and filling quality of the filling in the well; the drainage board 2 is placed in the concrete surface layer 1 to the nearby sump 18, and a micro-seepage self-drainage process is added. Utilizing the self-healing function of the micro-leakage of concrete can reduce unnecessary later maintenance. Thus, it can be seen that the present invention has a fast well sealing speed, good well sealing effect, and reduces unnecessary later maintenance.

[0082] The present invention adds a pressure-bearing locking member at the well-sealing flange 19 to accelerate the well-sealing speed and achieve rapid pressure-bearing well-sealing. If there is a gap between the reinforced concrete in the post-cast concrete pit 26 of the floor and the original floor reinforced concrete layer 3 after pouring the reinforced concrete, polyurethane foam is injected into the gap to replace the waterstop steel plate. During the concrete construction in a small space, it can prevent the phenomenon that air is easily collected under the waterstop steel plate, resulting in the concrete not being compacted easily, ensure the quality of concrete construction, and reduce the occurrence of leakage. The drainage board 2 is made of plastic, and the plastic drainage board 2 is placed above the post-cast concrete pit 26 of the floor, that is, the plastic drainage board 2 is placed between the concrete surface layer 1 and the post-cast concrete pit 26 of the floor. In this way, the tiny leakage caused by the rise of the groundwater level or the groundwater level exceeding the design can be self-guided to the catch basin 18 through the plastic drainage board 2, that is, a micro-seepage self-drainage process is added. By utilizing the self-healing function of concrete micro-seepage, unnecessary later maintenance can be reduced.

[0083] In the present invention, a water drainage device is added to the steel pipe well 28 (the water drainage device includes a drain pipe 15, a drain valve 16 and a drainage hose 17). When sealing the well, water is drained through the water drainage device, and the water pressure during well sealing is reduced by draining water, which can greatly reduce the water pressure during well sealing, lower the difficulty of well sealing, ensure the successful well sealing at one time, and then close the water drainage device after the well sealing is completed. To facilitate drainage, when initially setting up the dewatering well 6, the dewatering well 6 is arranged as close as possible to the catch basin 18. A pressure-bearing locking member is added at the well-sealing flange 19. The well-sealing flange cover 20 is located above the upper port of the steel pipe well 28, that is, above the well-sealing flange 19. When sealing the well, the well-sealing flange cover 20 rotates around the hinge shaft 21. Since the hinge shaft 21 is arranged vertically, the well-sealing flange cover 20 rotates horizontally, so that the handle 23 can quickly be stuck into the clamping groove 29 formed by the bottom plate 24, the vertical plate 25 and the top plate 27, thereby aligning the well-sealing flange cover 20 and the well-sealing flange 19 vertically, that is, aligning the bolt holes on the well-sealing flange cover 20 and the well-sealing flange 19 vertically, facilitating the quick installation of flange bolts, accelerating the well-sealing speed, achieving quick pressure-bearing well sealing, and being simple to operate and easy to construct. The rubber water stop pad 22 is pre-fixed on the well-sealing flange 19 to ensure that its position does not move, can achieve quick well sealing, ensure the flange sealing quality, and reduce the phenomenon of rework due to flange leakage. When sealing the well, graded sand and gravel are filled into the steel pipe well 28 until the top of the steel pipe well 28. During this process, the water in the steel pipe well 28 is discharged to the catch basin 18 through the drain pipe 15, the drain valve 16 and the drainage hose 17 in sequence. When the graded sand and gravel settle and consolidate, start to seal the well and rotate the flange cover to seal the well. If there are two or more dewatering wells 6, all the dewatering wells 6 are sealed in the same way. After the groundwater has no flowing water, the quick-setting cement slurry is then injected into the graded sand and gravel in the steel pipe well 28 through the grouting pipe 12, which can ensure that the filling material in the well is not lifted by the water pressure, ensure the compactness and filling quality of the filling material, and is simple to construct and easy to operate. If there is a gap between the reinforced concrete in the pit of the post-cast concrete pit 26 of the floor slab and the original floor slab reinforced concrete layer 3 after pouring the reinforced concrete, then polyurethane foam is injected into the gap to replace the water stop steel plate, which can reduce the area of the post-cast concrete pit 26 of the floor slab. During the concrete construction in a small space, it can prevent the phenomenon that gas is easily collected under the water stop steel plate, resulting in the concrete not being compact, ensure the concrete construction quality, and reduce the occurrence of leakage. A plastic drainage board 2 is placed between the concrete surface layer 1 and the post-cast concrete pit 26 of the floor slab to form a drainage channel to the nearby catch basin 18, and a micro-seepage self-drainage process is added. The small leakage caused by the rise of the groundwater level or the groundwater level exceeding the design can be automatically drained to the catch basin 18 through the plastic drainage board 2 and is automatically sealed later by using the self-healing function of the concrete micro-seepage, which can reduce unnecessary later maintenance. The construction of the present invention is simple, easy to operate, can ensure the successful plugging of the dewatering well 6 with ultra-high water pressure at one time, and reduce the occurrence of leakage.

[0084] It should be noted that the orientation or positional relationship indicated by terms such as "center", "upper", "lower", "front", "rear", "left", "right", "middle", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0085] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "connected" and "connected to" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0086] The embodiments described above are only for describing the preferred embodiments of the present invention and do not limit the scope of the present invention. Without departing from the design spirit of the present invention, various deformations and improvements made by those of ordinary skill in the art to the technical solutions of the present invention shall fall within the protection scope determined by the claims of the present invention.

Claims

1. A micro-seepage self-draining structure for plugging and draining of a precipitation well under ultra-high water pressure, characterized in that: It includes a steel pipe well vertically installed at the precipitation wellhead in the basement. The lower port of the steel pipe well communicates with the precipitation well, and the upper port of the steel pipe well is sealed by a plugging member. A grouting pipe and a drain pipe are provided on the well wall of the steel pipe well near the upper port. The steel pipe well is filled with graded sand and gravel fixedly connected by hardened cement slurry. On the basement floor outside the steel pipe well, a concrete cushion, a waterproof layer, and a floor reinforced concrete layer are laid in sequence from bottom to top. The concrete cushion, the waterproof layer, and the floor reinforced concrete layer are all in contact with the outer well wall of the steel pipe well along the circumferential direction of the steel pipe well. The positions of the concrete cushion and the waterproof layer in contact with the steel pipe well are arranged near the lower port of the steel pipe well. The upper surface of the floor reinforced concrete layer is located above the upper port of the steel pipe well. A post-cast concrete pit corresponding to the steel pipe well is provided on the upper surface of the floor reinforced concrete layer. The upper port, the grouting pipe, and the drain pipe of the steel pipe well are all located in the post-cast concrete pit of the floor. Reinforced concrete is poured in the post-cast concrete pit of the floor. The concrete strength in the post-cast concrete pit of the floor is one grade higher than the concrete strength of the floor reinforced concrete layer. A drainage board extending to the catch basin is laid above the post-cast concrete pit of the floor. A concrete surface layer is laid above the floor reinforced concrete layer and the drainage board.

2. The ultra-high water pressure dewatering well drainage plugging micro-seepage self-draining structure according to claim 1, characterized in that: The steel pipe well includes an upper part of the steel pipe well and a lower part of the steel pipe well both arranged vertically. An annular support plate arranged along the circumferential direction is fixedly provided on the outer well wall of the lower port of the lower part of the steel pipe well. The annular support plate is lapped on the edge of the precipitation wellhead along the circumferential direction. The lower port of the lower part of the steel pipe well communicates with the precipitation well. The upper port of the lower part of the steel pipe well is connected to the lower port of the upper part of the steel pipe well through a connection flange. The upper port of the upper part of the steel pipe well is sealed by a plugging member. A grouting pipe and a drain pipe are provided on the well wall of the upper part of the steel pipe well near the upper port. An annular water stop plate arranged along the circumferential direction is fixedly provided on the outer well wall of the upper part of the steel pipe well.

3. The ultra-high water pressure dewatering well drainage plugging micro-seepage self-draining structure according to claim 2, characterized in that: The plugging member includes a well-sealing flange, a well-sealing flange cover, and a locking member. The well-sealing flange is fixedly provided at the upper port of the upper part of the steel pipe well. The well-sealing flange cover is rotatably installed on the well-sealing flange through a vertically arranged hinge shaft. The well-sealing flange cover and the well-sealing flange are fixedly connected by bolts. The locking member includes a handle fixedly provided on the well-sealing flange cover and a clamping groove fixedly provided on the well-sealing flange. The handle is clamped in the clamping groove. A rubber water stop pad is provided between the well-sealing flange cover and the well-sealing flange.

4. The ultra-high water pressure dewatering well drainage plugging and slightly seepage self-draining structure according to claim 3, characterized in that: A bottom plate is fixedly provided on the well-sealing flange. A vertical plate is fixedly provided on the bottom plate. A top plate arranged opposite to the bottom plate is fixedly provided on the vertical plate. The handle is clamped between the bottom plate, the vertical plate, and the top plate. The bottom plate, the vertical plate, and the top plate together form the clamping groove.

5. A construction method of the micro-seepage self-draining structure for plugging and draining of the ultra-high water pressure dewatering well described in any one of claims 1-4, characterized in that, It includes the following steps: The first step: Prepare the steel pipe well. Drill a grouting hole and a drain hole on the well wall of the steel pipe well near the upper port. Weld a grouting pipe at the grouting hole on the outer well wall of the steel pipe well. Weld a drain pipe at the drain hole on the outer well wall of the steel pipe well. Install a grouting valve on the grouting pipe. Install a drain valve on the drain pipe. Connect a drainage hose to the drain valve. Install a plugging member at the upper port of the steel pipe well. Step 2: Arrange the steel pipe well vertically, place the lower port of the steel pipe well at the wellhead of the dewatering well, and then lay a concrete cushion and a waterproof layer on the basement floor outside the steel pipe well from bottom to top in sequence. Make both the concrete cushion and the waterproof layer contact the outer well wall of the steel pipe well circumferentially, thicken the part of the concrete cushion in contact with the steel pipe well, and arrange the positions of the concrete cushion and the waterproof layer in contact with the steel pipe well close to the lower port of the steel pipe well. Step 3: Install the bottom slab steel bars on the waterproof layer, and reserve a post-cast concrete pit for the bottom slab at the upper port of the steel pipe well. Make the upper port of the steel pipe well, as well as the plugging piece, grouting pipe, grouting valve, drain pipe, drain valve, and drainage hose thereon, all be located in the post-cast concrete pit for the bottom slab. Pour the bottom slab concrete to cover the bottom slab steel bars to form a bottom slab reinforced concrete layer. Make the bottom slab reinforced concrete layer contact the outer well wall of the steel pipe well circumferentially, and make the upper surface of the bottom slab reinforced concrete layer higher than the upper port of the steel pipe well. Step 4: Connect the drainage hose to the sump, open the drain valve, remove the plugging piece from the upper port of the steel pipe well, and fill graded sand and gravel into the steel pipe well from the upper port of the steel pipe well until the top of the steel pipe well. During this process, the water in the steel pipe well is discharged into the sump through the drain pipe, drain valve, and drainage hose in sequence. After the graded sand and gravel settle and consolidate, move the plugging piece to the upper port of the steel pipe well to seal it, and then close the drain valve and remove the drainage hose. Step 5: Open the grouting valve, inject a certain amount of quick-setting cement slurry into the steel pipe well through the grouting pipe, and then close the grouting valve. Then install steel bars in the post-cast concrete pit for the bottom slab, and pour concrete with a strength one grade higher than that of the bottom slab concrete into the post-cast concrete pit for the bottom slab. Step 6: Lay a drainage board extending to the sump above the post-cast concrete pit for the bottom slab, and then lay a concrete surface layer above the bottom slab reinforced concrete layer and the drainage board.

6. The construction method according to claim 5, characterized in that, In the first step mentioned above, the specific steps for preparing the steel pipe well are as follows: Prepare the upper part and the lower part of the steel pipe well. Weld a circumferentially arranged annular water stop plate on the outer well wall of the upper part of the steel pipe well, weld a circumferentially arranged annular support plate on the outer well wall of the lower port of the lower part of the steel pipe well, and connect the lower port of the upper part of the steel pipe well and the upper port of the lower part of the steel pipe well through a connecting flange to form the steel pipe well. The upper port of the upper part of the steel pipe well is the upper port of the steel pipe well, and the lower port of the lower part of the steel pipe well is the lower port of the steel pipe well.

7. The construction method according to claim 6, characterized in that, In the first step mentioned above, the specific steps for installing the plugging piece at the upper port of the steel pipe well are as follows: The plugging piece adopts a well-sealing flange, a well-sealing flange cover, and a locking piece. Weld the well-sealing flange on the upper port of the upper part of the steel pipe well, rotatably install the well-sealing flange cover on the well-sealing flange through a vertically arranged hinge shaft, bond a rubber water stop pad on the side of the well-sealing flange opposite to the well-sealing flange cover, the locking piece adopts a handle and a clamping groove, weld the handle on the well-sealing flange cover, fix the clamping groove on the well-sealing flange, rotate the well-sealing flange cover through the handle, and when the handle rotates into the clamping groove and is clamped with the clamping groove, the well-sealing flange cover is aligned with the well-sealing flange, and then fixedly connect the well-sealing flange cover and the well-sealing flange through bolts.

8. The construction method according to claim 7, characterized in that, In the first step mentioned above, the specific steps for fixing the clamping groove on the well-sealing flange are as follows: A bottom plate is welded to the sealing flange, a vertical plate is welded to the bottom plate, and a top plate arranged opposite to the bottom plate is welded to the vertical plate, so that the bottom plate, the vertical plate and the top plate together form a slot.

9. The construction method according to claim 8, characterized in that, In the second step, the specific steps of placing the lower port of the steel pipe well at the wellhead of the precipitation well are: aligning the lower port of the lower part of the steel pipe well with the wellhead of the precipitation well, and overlapping the annular support plate along the circumferential direction on the edge of the precipitation wellhead.

10. The construction method according to claim 9, characterized in that, In the fourth step, the specific steps of removing the sealing member from the upper port of the steel pipe well are as follows: remove the bolts between the sealing flange cover and the sealing flange, rotate the sealing flange cover by the handle, let the handle rotate out of the slot, and continue to rotate the sealing flange cover until the sealing flange cover is removed from the upper port of the steel pipe well. In the fourth step, the specific steps of moving the sealing part to the upper port of the steel pipe well to seal it are: rotating the sealing flange cover by the handle, when the handle is rotated into the slot and engaged with the slot, the sealing flange cover is aligned with the sealing flange, and then the sealing flange cover is fixedly connected to the sealing flange by bolts.

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