Pressure-bearing layer dewatering well plugging device and method

Abstract

The present application relates to the technical field of precipitation well plugging, in particular to a bearing stratum precipitation well plugging device and method. The device comprises a device body, the device body is provided with a first preset part, the first preset part is used for being put into an existing precipitation well; the first preset part comprises a hollow well pipe, an inner water stop steel plate is coaxially installed at one end of the well pipe, a water passing hole for inserting a galvanized steel pipe is formed at the inner water stop steel plate; an annular mounting groove for mounting water-swelling glue is formed at the inner water stop steel plate. The present application can realize the circumferential inward compaction and downward compaction of the water-swelling glue through the cooperation between the pressure rod and the second annular groove and the first annular groove; so that the construction personnel can more conveniently compact the water-swelling glue at the lower part of the well pipe on the galvanized steel pipe without entering the well pipe.

Description

Technical Field

[0001] This invention relates to the field of dewatering well plugging technology, and more specifically, to a device and method for plugging dewatering wells in confined strata. Background Technology

[0002] Dewatering of foundation pits is a crucial construction measure, and its effectiveness directly impacts the stability and safety of the pit, thus hindering construction progress. In areas with abundant groundwater and high water levels in the confined strata, dewatering must be maintained throughout the entire foundation pit construction cycle. Even after the foundation concrete at the bottom of the pit has been poured, dewatering wells must continue to be filled until the structural construction is completed, at which point dewatering must cease and the wells must be sealed.

[0003] However, during the sealing process of pressurized dewatering wells, poor sealing results often lead to water gushing from the wells during the sealing process or seepage after sealing, which seriously affects the quality of the project. Summary of the Invention

[0004] This invention provides a device and method for sealing dewatering wells in confined strata, which can overcome some or all of the defects of the prior art.

[0005] According to a device for sealing a dewatering well in a pressure layer according to the present invention, the device body includes a device body, the device body enclosing a first preset component, the first preset component being used to be inserted into an existing dewatering well;

[0006] The first pre-installed component includes a hollow well pipe, with an inner water-stop steel plate coaxially installed at one end of the well pipe. A water passage hole for inserting a galvanized steel pipe is formed in the inner water-stop steel plate, and an annular mounting groove for installing water-swellable adhesive is formed in the inner water-stop steel plate.

[0007] Specifically, when the device body of the present invention is used, the first preset component can be directly installed in the dewatering well. At the same time, the inner water-stop steel plate at the well pipe opening can better seal the well pipe from the outside. Furthermore, the inner water-stop steel plate of the present invention has a preset annular installation groove. Construction personnel can pre-place water-swellable adhesive in the annular installation groove and then pass the galvanized steel pipe through the water passage from top to bottom. However, at this time, it is difficult for the pre-installed water-swellable adhesive to form a tight connection with the galvanized steel pipe, which makes it difficult for the water-swellable adhesive to form a good seal for the gap, directly affecting the sealing effect of the subsequent dewatering well.

[0008] Furthermore, the water-swellable adhesive is installed inside the well casing, which needs to be inserted into the dewatering well. Therefore, the well casing is quite deep, making it difficult for operators to easily compact the water-swellable adhesive at the lower end of the casing. Therefore, the device body of this invention also includes a second preset component and a third preset component, the specific structures of which are as follows:

[0009] Preferably, the device body also includes a second preset component, which includes a clamping assembly for clamping the galvanized steel pipe; the clamping assembly includes a first clamp and a second clamp for fastening the connection; both the first clamp and the second clamp have a mounting ring with a semi-circular cross-section on one side near the inner waterstop steel plate.

[0010] Preferably, the mounting ring has a first annular groove and a second annular groove with a T-shaped cross-section, which are coaxially formed at the mounting ring. The first annular groove is located on the side near the inner ring wall of the mounting ring, and the second annular groove is located on the side near the outer ring wall of the mounting ring. The first annular grooves at the two mounting rings are joined together to form a complete annular groove, and the second annular grooves at the two mounting rings are also joined together to form a complete annular groove.

[0011] Preferably, the openings of both the first and second annular grooves extend to the outer wall of the mounting ring near the inner water-stop steel plate, forming an opening. The straight line extending from the opening of the first annular groove is parallel to the axis of the mounting ring, and the straight line extending from the opening of the second annular groove intersects with the axis of the mounting ring at a point located at the annular mounting groove for installing water-swellable adhesive. Both the first and second annular grooves include an annular groove body, within which a first groove portion with a large inner diameter and a second groove portion with a small inner diameter are formed. Multiple arc-shaped protrusions are formed on the inner wall of the first groove portion away from the second groove portion. The multiple protrusions are spaced apart along the extension direction of the annular groove body, and the positions of the protrusions within the annular groove bodies at the two mounting rings are complementary.

[0012] Preferably, the device body also includes a third preset component, which includes a pressure rod; the first end of the pressure rod is formed with a spherical sliding block, which is used to slide in conjunction with the first annular groove or the second annular groove, and the plurality of protrusions and the annular groove body cooperate together to form a wave-shaped sliding path of the sliding block; the second end of the pressure rod is formed with a pressure block, and the side of the pressure block near the inner water-stop steel plate is formed with a pressing surface, which is used to press against the water-swellable adhesive located at the annular mounting groove.

[0013] Preferably, an inner water-stop flange is also coaxially provided inside the well pipe, and the inner water-stop flange is located on the side away from the inner water-stop steel plate; the annular sidewall of the inner water-stop flange is used to abut against the pressure rod located in the second annular groove.

[0014] Preferably, the first pre-installed component also includes a first outer waterstop steel plate and a second outer waterstop steel plate coaxially installed on the outer wall of the well pipe.

[0015] Based on the aforementioned device body, the present invention also provides a method for sealing dewatering wells in confined strata, which includes the following steps:

[0016] Step S1: Install the first pre-installed component, which includes a well pipe and an inner water-stop steel plate, into the existing dewatering well;

[0017] Step S2: Install water-swellable adhesive between the inner waterstop steel plate and the galvanized steel pipe; the installation location is at the connection gap inside the well pipe;

[0018] Step S3: Reinforcing bar binding and formwork installation, pouring bottom slab concrete and pipe concrete, maintaining dewatering during pouring;

[0019] The entire process of step S3 involves continuous precipitation, which specifically includes the following steps:

[0020] Step S31: Before pouring concrete, install a ball valve at the galvanized steel pipe above the water-stop flange. The ball valve is bolted to the galvanized steel pipe, and the upper end of the ball valve is connected to the drain pipe.

[0021] Step S32: Before pouring the base slab concrete, apply water-swellable sealant to the surface of the outer waterstop steel plate;

[0022] Step S33: Pour the base slab concrete in layers, simultaneously pouring the concrete inside the pipe in layers and vibrating each layer until the concrete reaches below the water-stop flange and then stop pouring the concrete inside the pipe.

[0023] Step S34: Use the first water-stop steel plate to bolt to the water-stop flange inside the galvanized steel pipe, and apply water-swellable sealing adhesive between the first water-stop steel plate and the water-stop flange;

[0024] Step S4: Stop the dewatering, continue pouring concrete inside the pipe until it is parallel to the bottom slab surface, and finally seal the well;

[0025] Step S4 specifically includes the following steps:

[0026] Step S41: Stop the precipitation and tighten the ball valve to close it;

[0027] Step S42: Remove the water pipe above the ball valve;

[0028] Step S43: Pour concrete up to 5cm from the bottom slab surface;

[0029] Step S44: Weld the second waterstop steel plate;

[0030] Step S45: Pour the remaining concrete parallel to the bottom slab surface and cut off the excess steel pipes.

[0031] Preferably, step S1 specifically includes the following steps:

[0032] Step S11: After the foundation pit is excavated and before the foundation layer is poured, the water pump in the dewatering well is removed, and the drainage PVC pipe is replaced with a galvanized steel pipe and bolted to the water pump outlet.

[0033] Step S12: After one end of the galvanized steel pipe is connected to the water pump, the other end passes through the water passage hole at the bottom of the first preset component;

[0034] Step S13: Place the first pre-installed component, the galvanized steel pipe connected to the first pre-installed component, and the water pump into the existing dewatering well; the first pre-installed component is connected to the existing dewatering well by a socket, and the water pump enters the water in the well to continue dewatering.

[0035] Preferably, step S2 specifically includes the following steps:

[0036] Step S21: Before the galvanized steel pipe passes through the water passage at the bottom, pre-install water-swellable adhesive with glue on the inner wall into the annular mounting groove at the inner waterstop steel plate.

[0037] Step S22: The galvanized steel pipe passes through the water passage hole. Before the first clamp and the second clamp are fastened together, the sliding block in the third preset part is slid directly into the second annular groove from the gap between the first clamp and the second clamp.

[0038] Step S23: Secure the clamp assembly to the galvanized steel pipe; at this time, the first and second annular grooves at the two mounting rings interlock to form a complete circle;

[0039] Step S24: Move the pressure rod along the circumference of the well pipe. The pressure rod drives the sliding block to move in the inclined second sliding groove. The sliding block forms an inclination in the second sliding groove. The corresponding pressure rod and the pressure block also form an inclination. The inclination pressure rod abuts against the inner water-stop flange located in the well pipe to serve as a fulcrum for the pressure rod. The inclination pressure block abuts against the water-swellable adhesive located in the annular mounting groove in a circumferential inward abutting tendency.

[0040] Step S25: During the process of moving the pressure rod around the well pipe, each time the sliding block passes the protrusion in the second sliding groove, the pressure rod will tilt and fluctuate up and down. Each time the pressure rod is pressed down, the construction personnel will exert force downward to drive the pressure block to squeeze the water-swellable adhesive inward in a circumferential direction to compact it on the outer wall of the galvanized steel pipe; move the pressure rod around the well pipe multiple times to squeeze the water-swellable adhesive.

[0041] Step S26: Unfasten the clamp assembly, then move the sliding block out of the second annular groove and then into the first annular groove;

[0042] Step S27: Then move the pressure rod along the circumference of the well pipe again. During the movement, each time the sliding block passes the protrusion in the first annular groove, the pressure rod will form a vertical up-and-down oscillation trend. When the pressure rod is pressed down each time, the implementer will exert force downward to press the water-swellable adhesive into the gap between the galvanized steel pipe and the inner water-stop steel plate; move the pressure rod around the circumference of the well pipe multiple times.

[0043] Step S28: Swap the positions of the two mounting rings, and then repeat steps S22 to S27;

[0044] Step S29: After installation, release the clamp assembly and remove the second and third preset components from the well casing.

[0045] Therefore, the sealing method in this invention can achieve circumferential inward compaction and downward compaction of the water-swellable adhesive through the cooperation between the pressure rod and the second and first annular grooves, respectively. This allows construction personnel to conveniently compact the water-swellable adhesive at the bottom of the well casing onto the galvanized steel pipe without entering the well casing. Furthermore, after use, the second and third pre-installed components can be directly removed without affecting subsequent concrete pouring. Attached Figure Description

[0046] Figure 1 This is a schematic diagram of the structure of the device body in Example 1;

[0047] Figure 2 for Figure 1 A cross-sectional schematic diagram;

[0048] Figure 3 for Figure 1 A schematic diagram of the structure of the second preset component;

[0049] Figure 4 for Figure 3 Schematic diagram of the central clamp assembly and a single mounting ring;

[0050] Figure 5 for Figure 1 A structural schematic diagram of the third preset component;

[0051] Figure 6 This is a schematic diagram of step S1 in Example 1;

[0052] Figure 7 This is a schematic diagram of the installation of the rebar tying formwork in step S3 of Example 1;

[0053] Figure 8 This is a schematic diagram of step S33 in Example 1;

[0054] Figure 9 This is a schematic diagram of step S42 in Example 1;

[0055] Figure 10 This is a schematic diagram of steps S43-S44 in Example 1;

[0056] Figure 11 This is a schematic diagram of step S45 in Example 1. Detailed Implementation

[0057] To further understand the content of this invention, the invention will be described in detail with reference to the embodiments. It should be understood that the embodiments are merely illustrative and not limiting of the invention.

[0058] Example 1

[0059] This embodiment provides a device for sealing dewatering wells in confined strata, combined with... Figure 1 It includes a device body 100, the device body 100 includes a first preset component 110, the first preset component 110 is used to be placed into an existing dewatering well;

[0060] The first pre-installed component 110 includes a hollow well pipe 111, with an inner water-stop steel plate 112 coaxially installed at one end of the well pipe 111. Figure 2 The inner water-stop steel plate 112 has a water passage hole 210 for inserting the galvanized steel pipe 120; the inner water-stop steel plate 112 also has an annular mounting groove 220 for installing water-swellable adhesive.

[0061] Specifically, in this embodiment, when the device body 100 is in use, the first preset component 110 can be directly installed in the dewatering well. At the same time, the inner water-stop steel plate 112 at the well pipe 111 opening can better seal the well pipe 111 from the outside. Furthermore, in this embodiment, the inner water-stop steel plate 112 is preset with an annular installation groove 220. Construction personnel can pre-place water-swellable adhesive in the annular installation groove 220 and then pass the galvanized steel pipe 120 through the water passage hole 210 from top to bottom. However, at this time, it is difficult for the pre-installed water-swellable adhesive to form a tight connection with the galvanized steel pipe 120, which makes it difficult for the water-swellable adhesive to form a good seal for the gap, directly affecting the sealing effect of the subsequent dewatering well.

[0062] Furthermore, the water-swellable adhesive is installed inside the well pipe 111, which needs to be inserted into the dewatering well. Therefore, the well pipe 111 is quite deep, making it difficult for operators to easily compact the water-swellable adhesive at the lower end of the well pipe 111. Therefore, the device body 100 in this embodiment also includes a second preset component 130 and a third preset component 140, the specific structures of which are as follows:

[0063] In this embodiment, combined with Figure 1 The device body 100 also includes a second preset component 130, which includes a clamp assembly 131 for clamping the galvanized steel pipe 120; the clamp assembly 131 includes a first clamp body and a second clamp body for fastening connection; both the first clamp body and the second clamp body are provided with a mounting ring 132 with a semi-circular cross section on one side near the inner water-stop steel plate 112.

[0064] Specifically, in this embodiment, the clamp assembly 131 can be directly clamped onto the galvanized steel pipe 120 to form a fixed installation of the mounting ring 132.

[0065] In this embodiment, combined with Figure 3and Figure 4 A first annular groove 410 and a second annular groove 420 with a T-shaped cross section are coaxially formed at the mounting ring 132; the first annular groove 410 is located on the side near the inner annular wall of the mounting ring 132, and the second annular groove 420 is located on the side near the outer annular wall of the mounting ring 132; the first annular grooves 410 at the two mounting rings 132 engage with each other to form a complete annular groove, and the second annular grooves 420 at the two mounting rings 132 also engage with each other to form a complete annular groove.

[0066] In this embodiment, the openings of the first annular groove 410 and the second annular groove 420 both extend to the outer wall of the mounting ring 132 near the inner water-stop steel plate 112 and form an opening; the straight line of the extension direction of the opening of the first annular groove 410 is parallel to the axis of the mounting ring 132, and the straight line of the extension direction of the opening of the second annular groove 420 intersects the axis of the mounting ring 132 at the annular mounting groove 220 for installing water-swellable adhesive; both the first annular groove 410 and the second annular groove 420 include an annular groove body, and a first groove portion 430 with a large inner diameter and a second groove portion 440 with a small inner diameter are formed in the annular groove body; a plurality of arc-shaped protrusions 450 are formed on the inner wall of the first groove portion 430 away from the second groove portion 440; the plurality of protrusions 450 are arranged at intervals along the extension direction of the annular groove body; the positions of the protrusions 450 in the annular groove bodies of the two mounting rings 132 are complementary.

[0067] Specifically, the arrangement positions of the protrusions 450 in the annular grooves of the two mounting rings 132 are complementary. There is no position where the protrusions 450 are arranged in the annular groove of one mounting ring 132. If the mounting positions of the two mounting rings 132 are interchanged, the position where the protrusions 450 are not arranged can now be covered by the protrusions 450 in the annular groove of the other mounting ring 132.

[0068] In this embodiment, combined with Figure 1 and Figure 5 The device body 100 also includes a third preset component 140, which includes a pressure rod 510. The first end of the pressure rod 510 is formed with a spherical sliding block 520, which is used to slide in conjunction with the first annular groove 410 or the second annular groove 420. The plurality of protrusions 450 cooperate with the annular groove body to form a wave-shaped sliding path of the sliding block 520. The second end of the pressure rod 510 is formed with a pressure block 530, which forms a pressing surface 531 on the side near the inner water-stop steel plate 112. The pressing surface 531 is used to press against the water-swellable adhesive located in the annular mounting groove 220.

[0069] Furthermore, when the sliding block 520 of the pressure rod 510 moves within the first annular groove 410 and the second annular groove 420, the position of the protrusion 450 can form a wave so that the construction personnel can press down the water-swellable adhesive in a smooth manner; the construction personnel can move while always keeping close to the upper surface of the first annular groove 410 and the second annular groove 420.

[0070] Meanwhile, since the position of the protrusion 450 is fixed, even if the construction personnel move the pressure rod 510 around once, there will still be some missed areas that cannot be compacted. Therefore, it is only necessary to change the position of the mounting ring 132. Since the positions of the protrusions 450 in the annular groove of the two mounting rings 132 are complementary, the uncompacted areas can be covered after the change. Thus, through two full-circle compactions before and after the change, the entire circle of water-swellable adhesive can be compacted to fill the gaps, thereby effectively ensuring the sealing effect of the dewatering well.

[0071] In this embodiment, combined with Figure 2 The well pipe 111 is also coaxially provided with an inner water-stop flange 230, which is located on the side away from the inner water-stop steel plate 112. The annular sidewall of the inner water-stop flange 230 is used to abut against the pressure rod 510 located in the second annular groove 420.

[0072] In this embodiment, the first preset component 110 also includes a first outer waterstop steel plate 150 and a second outer waterstop steel plate 160 coaxially installed on the outer wall of the well pipe 111.

[0073] Based on the aforementioned device body 100, this embodiment also provides a method for sealing dewatering wells in confined strata, which includes the following steps:

[0074] Step S1: Install the first pre-installed component 110, which includes a well pipe 111 and an inner water-stop steel plate 112, into the existing dewatering well;

[0075] Step S2: Install water-swellable adhesive between the inner water-stop steel plate 112 and the galvanized steel pipe 120; the installation position is located in the connection gap inside the well pipe 111;

[0076] Step S3: Pour the base slab concrete and the concrete inside the pipe, and keep the water level down during the pouring process;

[0077] The entire process of step S3 involves continuous precipitation, which specifically includes the following steps:

[0078] Step S31: Before concrete pouring, a ball valve is installed at the galvanized steel pipe 120 above the water-stop flange. The ball valve is bolted to the galvanized steel pipe 120, and the upper end of the ball valve is connected to the drain pipe.

[0079] Step S32: Before pouring the base slab concrete, apply water-swellable sealant to the surface of the outer waterstop steel plate;

[0080] Step S33: Pour the base slab concrete in layers, simultaneously pouring the concrete inside the pipe in layers and vibrating each layer until the concrete reaches below the water-stop flange and then stop pouring the concrete inside the pipe.

[0081] Step S34: Use the first water-stop steel plate to bolt to the water-stop flange inside the galvanized steel pipe 120, and apply water-swellable sealing adhesive between the first water-stop steel plate and the water-stop flange;

[0082] Step S4: Stop the dewatering, continue pouring concrete inside the pipe until it is parallel to the bottom slab surface, and finally seal the well;

[0083] Step S4 specifically includes the following steps:

[0084] Step S41: Stop the precipitation and tighten the ball valve to close it;

[0085] Step S42: Remove the water pipe above the ball valve;

[0086] Step S43: Pour concrete up to 5cm from the bottom slab surface;

[0087] Step S44: Weld the second waterstop steel plate;

[0088] Step S45: Pour the remaining concrete parallel to the bottom slab surface and cut off the excess steel pipes.

[0089] In this embodiment, step S1 specifically includes the following steps:

[0090] Step S11: After the foundation pit is excavated and before the foundation layer is poured, the water pump in the dewatering well is removed, and the drainage PVC pipe is replaced with a galvanized steel pipe 120 and bolted to the water pump outlet.

[0091] Step S12: After one end of the galvanized steel pipe 120 is connected to the water pump, the other end passes through the water passage hole 210 at the bottom of the first preset part 110;

[0092] Step S13: Place the first preset component 110, the galvanized steel pipe 120 connected to the first preset component 110, and the water pump into the existing dewatering well; the first preset component 110 is connected to the existing dewatering well by a socket, and the water pump enters the water in the well to continue dewatering.

[0093] In this embodiment, step S2 specifically includes the following steps:

[0094] Step S21: Before the galvanized steel pipe 120 passes through the water passage 210 at the bottom, pre-install water-swellable adhesive with glue on the inner wall into the annular mounting groove 220 at the inner water-stop steel plate 112.

[0095] Step S22: The galvanized steel pipe 120 passes through the water passage 210. Before the first clamp and the second clamp are fastened together, the sliding block 520 in the third preset part 140 is slid directly into the second annular groove 420 from the gap between the first clamp and the second clamp.

[0096] Step S23: Securely install the clamp assembly 131 onto the galvanized steel pipe 120; at this time, the first annular groove 410 and the second annular groove 420 at the two mounting rings 132 engage with each other to form a complete circle;

[0097] Step S24: Move the pressure rod 510 circumferentially along the well pipe 111. The pressure rod 510 drives the sliding block 520 to move in the inclined second sliding groove. The sliding block 520 forms an inclination in the second sliding groove. The corresponding pressure rod 510 and the pressure block 530 also form an inclination. The inclination pressure rod 510 abuts against the inner water-stop flange 230 located in the well pipe 111 to serve as a fulcrum for the pressure rod 510. The inclination pressure block 530 abuts against the water-swellable adhesive located in the annular mounting groove 220 in a circumferential inward abutting tendency.

[0098] Step S25: During the process of moving the pressure rod 510 around the well pipe 111, each time the sliding block 520 passes the protrusion 450 in the second sliding groove, the pressure rod 510 will tilt and fluctuate up and down. Each time the pressure rod 510 is pressed down, the construction personnel will exert force downward to drive the pressure block 530 to squeeze the water-swellable adhesive inward in a circumferential direction to compact it on the outer wall of the galvanized steel pipe 120; move the pressure rod 510 around the well pipe 111 multiple times to squeeze the water-swellable adhesive.

[0099] Step S26: Unfasten the clamp assembly 131, then move the sliding block 520 out of the second annular groove 420 and then into the first annular groove 410;

[0100] Step S27: Then move the pressure rod 510 around the well pipe 111 again. During the movement, each time the sliding block 520 passes the protrusion 450 in the first annular groove 410, the pressure rod 510 will form a vertical up-and-down oscillation trend. When the pressure rod 510 is pressed down each time, the implementer will exert force downward to press the water-swellable adhesive into the gap between the galvanized steel pipe 120 and the inner water-stop steel plate 112; move the pressure rod 510 around the well pipe 111 several times.

[0101] Step S28: Swap the positions of the two mounting rings 132, and then repeat steps S22 to S27;

[0102] Step S29: After installation, release the clamp assembly 131 and remove the second preset component 130 and the third preset component 140 from the well casing 111.

[0103] Therefore, the sealing method in this embodiment can achieve circumferential inward compaction and downward compaction of the water-swellable adhesive through the cooperation between the pressure rod 510 and the second annular groove 420 and the first annular groove 410, respectively. This allows construction personnel to conveniently compact the water-swellable adhesive at the bottom of the well pipe 111 onto the galvanized steel pipe 120 without entering the well pipe 111. Furthermore, after use, the second pre-set component 130 and the third pre-set component 140 can be directly removed without affecting subsequent concrete pouring.

[0104] Furthermore, in this device:

[0105] 1. The well pipe 111 of this device is made of 8mm thick steel pipe with an inner diameter of 328mm, which has high strength and can ensure that the structure does not deform during the concrete pouring process.

[0106] 2. Two water-stop steel plates are installed on the outside of the well pipe 111 and coated with water-swellable water-stop adhesive, which can effectively prevent groundwater from seeping out from the outside of the well pipe 111 (first layer of water flow blocking).

[0107] 3. When installing well pipe 111, it should be inserted deep below the bedding layer, using the bedding layer to act as an external water blockage for well pipe 111 (a second layer of water flow blocking).

[0108] 4. The bottom of the well pipe 111 is equipped with an inner water-stop steel plate 112, and a 50mm water passage hole 210 is left in the middle for the water supply pipe to pass through. While effectively ensuring the dewatering function, it effectively prevents large-flow water from gushing into the well pipe 111 (the third layer of water flow blocking).

[0109] 5. An inner water-stop flange 230 is installed on the upper inner side of the well pipe 111. This facilitates the connection speed of the water-stop steel plate when the concrete is poured to the bottom of the flange, avoiding excessive welding time. Simultaneously, water-swellable sealant is applied to the flange joint to effectively prevent water seepage. A galvanized steel pipe 120 passes through the center hole of the flange water-stop steel plate and is fully coated with water-swellable sealant. This effectively ensures no water seepage (fourth layer of water flow blocking).

[0110] 6. The top of the water pipe can be equipped with a ball valve structure, which can effectively block the water flow in the dewatering pipe, which is conducive to the overall sealing of the dewatering well. At the same time, before complete sealing, dewatering can be selected or stopped at any time according to construction needs (the fifth layer of water flow blocking).

[0111] 7. Concrete is poured into the top of the ball valve and a steel plate is welded on it to block the water flow and ultimately ensure the well sealing effect (sixth layer of water flow blocking).

[0112] It is readily understood that those skilled in the art can combine, split, or reorganize the embodiments provided in this application to obtain other embodiments, all of which do not exceed the protection scope of this application.

[0113] The present invention and its embodiments have been described above illustratively. This description is not restrictive, and the embodiments shown are only part of the embodiments of the present invention. The actual structure is not limited thereto. Therefore, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the present invention, they should all fall within the protection scope of the present invention.

Claims

1. A device for sealing dewatering wells in confined strata, characterized in that: The device includes a main body (100), which includes a first preset component (110) for insertion into an existing dewatering well. The first pre-installed component (110) includes a hollow well pipe (111), with an inner water-stop steel plate (112) coaxially installed at one end of the well pipe (111). A water passage hole (210) for inserting a galvanized steel pipe (120) is formed in the inner water-stop steel plate (112); an annular mounting groove (220) for installing water-swellable adhesive is formed in the inner water-stop steel plate (112). The device body (100) also includes a second preset component (130), which includes a clamp assembly (131) for clamping the galvanized steel pipe (120); the clamp assembly (131) includes a first clamp body and a second clamp body for fastening connection; the first clamp body and the second clamp body are each provided with a mounting ring (132) with a semi-circular cross section on one side near the inner water-stop steel plate (112). A first annular groove (410) and a second annular groove (420) with a T-shaped cross-section are coaxially formed at the mounting ring (132); the first annular groove (410) is located on one side near the inner annular wall of the mounting ring (132), and the second annular groove (420) is located on one side near the outer annular wall of the mounting ring (132); the first annular grooves (410) at the two mounting rings (132) are joined together to form a complete annular groove, and the second annular grooves (420) at the two mounting rings (132) are also joined together to form a complete annular groove; The openings of the first annular groove (410) and the second annular groove (420) both extend to the outer wall of the mounting ring (132) near the inner water-stop steel plate (112) and form an opening; the straight line in which the opening of the first annular groove (410) extends is parallel to the axis of the mounting ring (132), and the straight line in which the opening of the second annular groove (420) extends intersects with the axis of the mounting ring (132), and the intersection point is located at the annular mounting groove (220) used for installing water-swellable adhesive; the first annular groove (410) and the second annular groove (420) both include an annular groove body, in which a first groove portion (430) with a large inner diameter and a second groove portion (440) with a small inner diameter are formed; a plurality of arc-shaped protrusions (450) are formed on the inner wall of the first groove portion (430) away from the second groove portion (440); the plurality of protrusions (450) are arranged at intervals along the extension direction of the annular groove body; the positions of the protrusions (450) in the annular groove body at the two mounting rings (132) complement each other; The device body (100) also includes a third preset component (140), which includes a pressure rod (510); the first end of the pressure rod (510) is formed with a spherical sliding block (520), which is used to slide with the first annular groove (410) or the second annular groove (420), and the plurality of protrusions (450) cooperate with the annular groove body to form a wave-shaped sliding path of the sliding block (520); the second end of the pressure rod (510) is formed with a pressure block (530), and the side of the pressure block (530) near the inner water-stop steel plate (112) forms a pressing surface (531), which is used to press against the water-swellable adhesive located in the annular mounting groove (220).

2. The device for sealing dewatering wells in confined strata according to claim 1, characterized in that: The well pipe (111) is also coaxially provided with an inner water-stop flange (230), which is located on the side away from the inner water-stop steel plate (112); the annular sidewall inside the inner water-stop flange (230) is used to abut against the pressure rod (510) located in the second annular groove (420).

3. The device for sealing dewatering wells in confined strata according to claim 1, characterized in that: The first pre-installed component (110) also includes a first outer waterstop steel plate (150) and a second outer waterstop steel plate (160) coaxially installed on the outer wall of the well pipe (111).

4. A method for sealing dewatering wells in confined strata, characterized in that, The device for sealing dewatering wells in confined strata according to any one of claims 1-3 includes the following steps: Step S1: Install the first pre-installed component (110), which includes a well pipe (111) and an inner water-stop steel plate (112), into the existing dewatering well; Step S2: Install water-swellable adhesive between the inner water-stop steel plate (112) and the galvanized steel pipe (120); the installation position is located in the connection gap inside the well pipe (111); use the second pre-set piece (130) and the third pre-set piece (140) to press the water-swellable adhesive between the inner water-stop steel plate (112) and the galvanized steel pipe (120); Step S3: Pour the base slab concrete and the concrete inside the pipe, and keep the water level down during the pouring process; The entire process of step S3 involves continuous precipitation, which specifically includes the following steps: Step S31: Before concrete pouring, a ball valve is installed at the galvanized steel pipe (120) above the water-stop flange. The ball valve is bolted to the galvanized steel pipe (120), and the upper end of the ball valve is connected to the drain pipe. Step S32: Before pouring the base slab concrete, apply water-swellable sealant to the surface of the outer waterstop steel plate; Step S33: Pour the base slab concrete in layers, simultaneously pouring the concrete inside the pipe in layers and vibrating each layer until the concrete reaches below the water-stop flange and then stop pouring the concrete inside the pipe. Step S34: Use the first water-stop steel plate to connect with the water-stop flange inside the galvanized steel pipe (120) by bolts, and apply water-swellable water-stop adhesive between the first water-stop steel plate and the water-stop flange; Step S4: Stop the dewatering, continue pouring concrete inside the pipe until it is parallel to the bottom slab surface, and finally seal the well; Step S4 specifically includes the following steps: Step S41: Stop the precipitation and tighten the ball valve to close it; Step S42: Remove the water pipe above the ball valve; Step S43: Pour concrete up to 5cm from the bottom slab surface; Step S44: Weld the second waterstop steel plate; Step S45: Pour the remaining concrete parallel to the bottom slab surface and cut off the excess steel pipes.

5. The method for sealing dewatering wells in confined strata according to claim 4, characterized in that, Step S1 specifically includes the following steps: Step S11: After the foundation pit is excavated and before the foundation layer is poured, the water pump in the dewatering well is taken out, and the drainage PVC pipe is replaced with a galvanized steel pipe (120) and bolted to the water pump outlet. Step S12: After one end of the galvanized steel pipe (120) is connected to the water pump, the other end passes through the water passage hole (210) at the bottom of the first preset part (110); Step S13: Place the first preset component (110), the galvanized steel pipe (120) connected to the first preset component (110), and the water pump into the existing dewatering well; the first preset component (110) is connected to the existing dewatering well by a socket, and the water pump enters the water in the well to continue dewatering.

6. The method for sealing dewatering wells in confined strata according to claim 4, characterized in that, Step S2 specifically includes the following steps: Step S21: Before the galvanized steel pipe (120) passes through the water passage (210) at the bottom, pre-install water-swellable adhesive with glue on the inner wall into the annular mounting groove (220) at the inner water-stop steel plate (112); Step S22: The galvanized steel pipe (120) passes through the water passage (210). Before the first clamp and the second clamp are fastened together, the sliding block (520) in the third preset piece (140) is slid directly into the second annular groove (420) from the gap between the first clamp and the second clamp. Step S23: Secure the clamp assembly (131) to the galvanized steel pipe (120); at this time, the first annular groove (410) and the second annular groove (420) at the two mounting rings (132) interlock to form a complete circle; Step S24: Move the pressure rod (510) circumferentially along the well pipe (111). The pressure rod (510) drives the sliding block (520) to move in the inclined second sliding groove. The sliding block (520) forms an inclined pressure rod (510) and the pressure block (530) also forms an inclined position in the second sliding groove. The inclined pressure rod (510) abuts against the inner water-stop flange (230) located in the well pipe (111) to serve as a fulcrum for the pressure rod (510). The inclined pressure block (530) abuts against the water-swellable adhesive located in the annular mounting groove (220) in a circumferential inward abutting tendency. Step S25: During the process of moving the pressure rod (510) circumferentially along the well pipe (111), each time the sliding block (520) passes the protrusion (450) in the second sliding groove, the pressure rod (510) will tilt and fluctuate up and down accordingly. Each time the pressure rod (510) is pressed down, the construction personnel will exert force downward to drive the pressure block (530) to squeeze the water-swellable adhesive circumferentially inward to compact it on the outer wall of the galvanized steel pipe (120); move the pressure rod (510) circumferentially along the well pipe (111) multiple times to squeeze the water-swellable adhesive; Step S26: Unfasten the clamp assembly (131), then move the sliding block (520) out of the second annular groove (420) and then into the first annular groove (410); Step S27: Then move the pressure rod (510) around the well pipe (111) again. During the movement, each time the sliding block (520) passes the protrusion (450) in the first annular groove (410), the pressure rod (510) will form a vertical up-and-down oscillation trend. When the pressure rod (510) is pressed down each time, the implementer will exert force downward to press the water-swellable adhesive into the gap between the galvanized steel pipe (120) and the inner water-stop steel plate (112); move the pressure rod (510) around the well pipe (111) multiple times. Step S28: Swap the positions of the two mounting rings (132), and then repeat steps S22 to S27; Step S29: After installation, release the clamp assembly (131) and remove the second preset component (130) and the third preset component (140) from the well casing (111).

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