Basement dewatering well plugging system and plugging method

Abstract

The invention provides a basement dewatering well plugging system and plugging method which are used for solving the problem that in the prior art, a dewatering well is difficult to seal completely in an area with much underground water. The device comprises a well casing sealing device, a well mouth sealing device, a first gravel layer and a second gravel layer, the well casing of the dewatering well is sealed through the well casing sealing device, the amount of underground water located at the well mouth is reduced, then the water pressure of the underground water is reduced, and the well mouth of the dewatering well can be conveniently sealed through the well mouth sealing device; first-stage sealing of a wellhead is formed through the supporting effect of a wellhead cover plate and a supporting assembly of the wellhead sealing device on a metal sealing piece, second-stage sealing is formed in a casing pipe through a concrete layer, third-stage sealing is formed in the casing pipe through an elastic sealing piece, and fourth-stage sealing is formed through threaded connection of a casing pipe sealing cover and the casing pipe, so that underground water leakage is prevented; the sealing effect of the dewatering well is ensured.

Description

Technical Field

[0001] The invention belongs to the field of drainage well plugging, and in particular relates to a basement drainage well plugging system and a plugging method. Background Art

[0002] When constructing a basement with a lot of groundwater, multiple precipitation wells will be built in the construction area. During the construction process, water pumps will be used to continuously extract groundwater from the precipitation wells to ensure that the remaining construction areas except the areas where the precipitation wells are built can be constructed smoothly. After the construction of the remaining construction areas is completed, the precipitation wells will be sealed to complete the construction of the entire basement.

[0003] Most of the existing drainage well plugging solutions adopt the method of directly filling gravel and other building materials in the drainage well pipe, and then setting a wellhead plugging device at the wellhead for sealing. This construction solution can only be applied to areas with less groundwater. In areas with abundant groundwater, since gravel and other building materials are filled in the well pipe of the drainage well, the groundwater collected in the drainage well will continue to gather at the wellhead, resulting in the wellhead always being in a state of groundwater when the wellhead sealing device of the drainage well is used to seal the wellhead. In addition, the wellhead sealing device at the wellhead also increases the water pressure of the groundwater, which makes it difficult for the wellhead sealing device to completely seal the wellhead. Summary of the invention

[0004] In view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide a basement drainage well sealing system and a sealing method, which are used to solve the problem in the prior art that drainage wells are difficult to completely seal in areas with more groundwater.

[0005] To achieve the above-mentioned and other related purposes, the present invention provides a basement dewatering well plugging system, comprising: a well pipe sealing device, a wellhead sealing device, a first crushed stone layer and a second crushed stone layer; the well pipe sealing device is used to seal the well pipe of the dewatering well, and the wellhead sealing device is used to seal the wellhead of the dewatering well; the first crushed stone layer is arranged between the well bottom of the dewatering well and the well pipe sealing device, and the second crushed stone layer is arranged between the well pipe sealing device and the wellhead sealing device; the wellhead sealing device of the dewatering well comprises: a wellhead cover plate, a casing and a plugging structure; the wellhead cover plate comprises a groundwater outlet, the casing is fixed on the wellhead cover plate, and the inner hole of the casing is connected to the groundwater outlet; the plugging structure is used to plug the inner hole of the casing; the plugging structure comprises a metal seal, a support assembly, a mixed seal arranged from bottom to top in the casing Concrete layer, elastic sealing layer and casing sealing cover; the support assembly is used to fix the metal seal in the casing; the elastic sealing layer is used to fill the gap between the concrete layer and the casing sealing cover; the well pipe sealing device includes: a first sealing disk, an elastic seal, a second sealing disk, a seal transmission mechanism and a blocking mechanism; the elastic seal is arranged between the first sealing disk and the second sealing disk, and the seal transmission mechanism is slidably arranged on the first sealing disk, and is used to drive the elastic seal to undergo elastic deformation so that the elastic seal abuts against the inner wall of the well pipe of the precipitation well to seal the well pipe; the blocking mechanism is arranged on the second sealing disk, and when the elastic seal abuts against the inner wall of the well pipe, the blocking mechanism is used to limit the seal transmission mechanism to maintain the abutment between the elastic seal and the inner wall of the well pipe of the precipitation well.

[0006] Optionally, a second step for limiting the metal seal is provided on the inner wall of the groundwater outlet of the wellhead cover; a plurality of slots are provided on the inner wall of the casing, and the support assembly includes a support rod, a limiting nut, a support seat, a plurality of support rods and a plurality of support blocks; the slots, support rods and support blocks are provided in a one-to-one correspondence; the support rod is provided on the metal seal, one end of the support rod is rotatably connected to the support seat, and the other end is rotatably connected to the support block; a connecting hole for the support rod to pass through is provided in the support seat, and the support block is used to be connected to the slot; the limiting nut is threadedly connected to the support rod for limiting the support seat.

[0007] Optionally, the casing sealing cover is connected to the casing by threads; and / or a waterproof layer is provided at the connection between the wellhead cover plate and the wellhead of the precipitation well, the connection between the wellhead cover plate and the casing, and the connection between the casing and the casing sealing cover.

[0008] Optionally, the sealing transmission mechanism includes a plurality of first transmission components, a first transmission disk, a plurality of second transmission components, a second transmission disk and a transmission shaft assembly; the first sealing disk is provided with a plurality of guide grooves for guiding the movement of the first transmission components and the second transmission components; the guide grooves and the first transmission components and the second transmission components are arranged in a one-to-one correspondence; the first transmission component and the first guide disk are rotationally connected, and the second transmission component and the second transmission disk are rotationally connected; the transmission shaft assembly is used to drive the first transmission disk and the second transmission disk to move, and then drive the first transmission component and the second transmission component to abut against a side of the elastic seal away from the well pipe, and then drive the elastic seal to undergo elastic deformation; the blocking mechanism is used to limit the transmission shaft assembly.

[0009] Optionally, the first transmission assembly includes a first connecting rod, a first slider and a first abutment; one end of the first connecting rod is rotatably connected to the first transmission disk, and the other end is rotatably connected to the first sliding member, the first slider is arranged in a guide groove, and the first abutment is arranged on the first slider; the second transmission assembly includes a second connecting rod, a second slider and a second abutment; one end of the second connecting rod is rotatably connected to the second transmission disk, and the other end is rotatably connected to the second sliding member, the second slider is arranged in the guide groove, and the second abutment is arranged on the second slider; the first abutment and the second abutment are used to abut against the elastic sealing member; when the elastic sealing member abuts against the side wall of the well pipe, multiple first abutment members and multiple second abutment members form a circular ring shape.

[0010] Optionally, the guide groove includes a first sub-guide groove and two second sub-guide grooves; the two second sub-guide grooves are respectively arranged on one of the two side walls of the first sub-guide groove that are opposite to each other; two protrusions are respectively arranged on the first slider and the second slider, and the protrusions are arranged one-to-one corresponding to the second sub-guide grooves; and / or, the first sealing disk includes an avoidance hole and a sealing piece, the avoidance hole is connected to multiple guide grooves, and the sealing piece is used to block the avoidance hole.

[0011] Optionally, the transmission shaft assembly includes a first transmission shaft, a second transmission shaft and a first elastic member; a first sliding groove is provided on the second transmission shaft, the center line of the first sliding groove coincides with the center axis of the second transmission shaft, the first elastic member is arranged in the first sliding groove, one end of which is connected to the bottom of the first sliding groove, and the other end is connected to the first transmission shaft; the first transmission shaft is partially arranged in the first sliding groove; a first through hole is provided on the second transmission disk, and one end of the first transmission shaft extending out of the first sliding groove passes through the first through hole and is connected to the first transmission disk; one end of the second transmission shaft provided with the first sliding groove is used to be connected to the second transmission disk; the blocking mechanism is used to limit the second transmission shaft.

[0012] Optionally, a plurality of second sliding grooves are arranged on the outer side surface of the second transmission shaft, and a limiting hole is arranged at the bottom of the second sliding groove away from the connecting end of the second transmission shaft and the second transmission disk; a third through hole is arranged on the second sealing disk for avoiding the first group of transmission components, the second group of transmission components and the transmission shaft component; the blocking mechanism includes a sealing cone, a plurality of second elastic members and a plurality of limiting columns; one end of the sealing cone barrel is connected to the second sealing disk, and the other end is provided with a second through hole for the second transmission shaft to pass through; a receiving cavity for accommodating the transmission shaft component is also arranged in the sealing cone barrel, and a receiving cavity for accommodating the transmission shaft component is arranged The cavity is connected to the second through hole; the inner wall of the second through hole is provided with a plurality of mounting holes symmetrically arranged with the axis of the second through hole as the symmetry line, the limiting hole, the mounting hole, the second elastic member and the limiting column are arranged one by one, the limiting column part is arranged in the mounting hole, the second elastic member is arranged in the mounting hole, one end of the limiting column is connected to the bottom of the mounting hole, and the other end is connected to the limiting column, and one end of the limiting column extending out of the mounting hole is located in the second sliding groove; when the elastic sealing member abuts against the inner wall of the well pipe, one end of the limiting column extending out of the mounting hole penetrates into the limiting hole, which is used to limit the second transmission shaft.

[0013] Optionally, the blocking mechanism further comprises a sealing cover, and a connecting portion is provided at one end of the sealing cone away from the second sealing disk, and the sealing cover is threadedly connected to the connecting portion for closing the second through hole.

[0014] Another aspect of the present invention provides a method for plugging a basement drainage well, including a basement drainage well plugging system as described above, and further including: a first gravel layer filling step: filling gravel material into the drainage well to form a first gravel layer; a well pipe sealing device installation step: placing the well pipe sealing device into the well pipe of the drainage well, pressing the seal transmission mechanism downward so that the seal transmission mechanism first abuts against the inner ring of the elastic seal, and then continuously pressing the seal transmission mechanism downward so that the elastic seal undergoes elastic deformation, so that the elastic seal Abut against the inner wall of the well pipe; second gravel layer filling step: fill gravel material into the precipitation well to form a second gravel layer; wellhead sealing device installation step: first apply cement mortar at the connection between the wellhead cover and the wellhead, and install the wellhead cover on the wellhead; then install the metal seal into the casing, and use the support assembly to limit the metal seal in the casing, and then fill the casing with concrete to form a slow-setting soil layer. After the concrete layer is formed, an elastic sealing layer is set on the concrete layer, and finally the casing is sealed with a casing sealing cover.

[0015] As described above, a basement dewatering well sealing system and a sealing method of the present invention have at least the following beneficial effects: the present invention arranges a well pipe sealing device and a wellhead sealing device in the well pipe of the dewatering well, and the well pipe sealing device includes a first sealing disk, an elastic seal, a second sealing disk, a seal transmission mechanism and a blocking mechanism; when in use, the elastic seal is elastically deformed by the driving of the seal transmission mechanism, so that the elastic seal is abutted against the inner wall of the well pipe, thereby realizing the segmented sealing of the dewatering well, reducing the amount of groundwater at the wellhead when the wellhead sealing device seals the wellhead of the dewatering well, thereby reducing the water pressure of the groundwater, making it easier for the wellhead sealing device to seal the wellhead of the dewatering well, and providing a blocking mechanism, which can maintain the elastic seal abutting against the inner wall of the well pipe after the seal transmission mechanism moves into place, thereby ensuring the sealing effect of the sealing device. The wellhead sealing device forms a primary seal at the wellhead by utilizing the supporting effect of the wellhead cover plate and the supporting assembly on the metal seal, a secondary seal is formed in the casing by utilizing the concrete layer, a tertiary seal is formed in the casing by the elastic seal, and a fourth seal is formed by utilizing the threaded connection between the casing sealing cover and the casing, thereby preventing groundwater leakage and ensuring the sealing effect of the precipitation well. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Shown is a structural schematic diagram of a basement drainage well blocking system of the present invention.

[0017] Figure 2 Display as Figure 1 A local enlarged view of point A in the figure.

[0018] Figure 3 It is a schematic structural diagram of a wellhead cover plate and a casing of a wellhead sealing device of the present invention.

[0019] Figure 4 Shown is a schematic cross-sectional structural diagram of a wellhead cover plate and a casing of a wellhead sealing device of the present invention.

[0020] Figure 5 Shown is a structural schematic diagram of the sealing structure of the wellhead sealing device of the present invention.

[0021] Figure 6 Shown is a schematic structural diagram of the well pipe plugging device of the present invention.

[0022] Figure 7 It is a schematic structural diagram of the well pipe plugging device of the present invention with the blocking mechanism omitted.

[0023] Figure 8 It is a schematic diagram showing the structure of the well pipe plugging device of the present invention, omitting the blocking mechanism and the second sealing disk.

[0024] Fig. 9It is a schematic diagram showing the structure of the well pipe plugging device of the present invention, in which the blocking mechanism, the first sealing disc, the second sealing disc and the elastic sealing member are omitted.

[0025] Fig.10 It is a schematic structural diagram of the sealing cone of the well pipe plugging device of the present invention.

[0026] Fig.11 Shown is a partial cutaway schematic diagram of the sealing cone of the well pipe plugging device of the present invention.

[0027] Fig.12 Shown is a schematic structural diagram of the first sealing disk of the well pipe plugging device of the present invention. DETAILED DESCRIPTION

[0028] The following is a description of the implementation of the present invention by means of specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0029] Please refer to all the following drawings. It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the effects and purposes that can be achieved by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. Changes or adjustments in their relative relationships should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0030] The following embodiments are only for illustration purposes and can be combined with each other, and are not limited to the contents presented in the following single embodiments.

[0031] See also Figure 1-2The present invention provides a basement dewatering well plugging system, comprising: a well pipe sealing device 10, a wellhead sealing device 20, a first crushed stone layer 30 and a second crushed stone layer 40; the well pipe sealing device 10 is used to seal the well pipe of the dewatering well, and the wellhead sealing device 20 is used to seal the wellhead of the dewatering well; the first crushed stone layer 30 is arranged between the well bottom of the dewatering well and the well pipe sealing device 10, and the second crushed stone layer 40 is arranged between the well pipe sealing device 10 and the wellhead sealing device 20; the dewatering well wellhead sealing device 20 comprises: a wellhead cover plate 6, a casing 7 and a plugging structure 8; the wellhead cover plate 6 comprises a groundwater outlet 61, the casing 7 is fixed on the wellhead cover plate 6, and the inner hole of the casing 7 is connected to the groundwater outlet 61; the plugging structure 8 is used to plug the inner hole of the casing 7; the plugging structure 8 comprises a metal seal 81, a support assembly 82, a concrete Layer 83, elastic sealing layer 84 and casing sealing cover 85; the support assembly 82 is used to fix the metal seal 81 in the casing 7; the elastic sealing layer 84 is used to fill the gap between the concrete layer 83 and the casing sealing cover 85; the well pipe sealing device 10 includes: a first sealing disk 1, an elastic seal 2, a second sealing disk 3, a seal transmission mechanism and a blocking mechanism 5; the elastic seal 2 is arranged between the first sealing disk 1 and the second sealing disk 3, and the seal transmission mechanism is slidably arranged on the first sealing disk 1, and is used to drive the elastic seal 2 to undergo elastic deformation so that the elastic seal 2 abuts against the inner side wall of the well pipe of the precipitation well to seal the well pipe; the blocking mechanism 5 is arranged on the second sealing disk 3, and when the elastic seal 2 abuts against the inner side wall of the well pipe, the blocking mechanism 5 is used to limit the seal transmission mechanism to maintain the abutment of the elastic seal 2 with the inner side wall of the well pipe of the precipitation well.

[0032] See also Figure 3-5The wellhead cover plate 6 can be a hollow cylindrical metal structure, and a groundwater outlet 61 connected to the inner hole of the casing 7 is arranged at its center line. The wellhead cover plate 6 can also include a first cover plate 62 and a second cover plate 63. The first cover plate 62 and the second cover plate 63 can be integrally formed or separately formed, and then fixedly connected together by welding or the like. The diameter of the first cover plate 62 is smaller than the diameter of the second cover plate 63, the diameter of the first cover plate 62 is less than or equal to the diameter of the wellhead, and the diameter of the second cover plate 63 is greater than or equal to the diameter of the wellhead, and a first sub-groundwater outlet 611 is arranged at the center line of the first cover plate 62, and a second sub-groundwater outlet 612 is arranged at the center line of the second cover plate 63, and the diameter of the first sub-groundwater outlet 611 is smaller than the diameter of the second sub-groundwater outlet 612, so that a first step 64 for increasing the contact area with the wellhead and a second step for limiting the metal seal 81 are formed on the first cover plate 62 and the second cover plate 63. The casing 7 and the second cover plate 63 can be formed separately and then fixed together by welding or other methods before the construction of the precipitation well. The diameter of the inner hole of the casing 7 is equal to the diameter of the second sub-groundwater outlet 612, and the diameter of the metal seal 81 is less than or equal to the diameter of the second sub-groundwater outlet 612, and greater than the diameter of the first sub-groundwater outlet 611. When the support assembly 82 is in use, a part of its structure abuts against the inner side of the casing 7, and another part of its structure abuts against the metal seal 81, so that the metal seal 81 can be limited in the casing 7. The elastic sealing layer 84 can be an elastic disc-shaped structure made of rubber or other materials, which is used to fill the gap between the concrete layer 83 and the casing sealing cover 85. The end of the casing 7 away from the second cover plate 63 is provided with an external thread, and the casing sealing cover 85 is provided with an internal thread. The casing 7 and the casing sealing cover 85 are connected by threads. The thickness of the elastic sealing layer 84 can be greater than the gap between the concrete layer 83 and the casing sealing cover 85, so that when the casing sealing cover 85 is installed on the casing 7, the elastic sealing layer 84 is compressed, thereby achieving close contact between the elastic sealing member 2 and the inner side of the casing 7. When the first gravel layer 30 and the second gravel layer 40 are filled, the gravel layer particles can be small particles at the position close to the well pipe sealing device 10 and the wellhead sealing device 20, and large particles at the position away from the wellhead sealing device 20 and the well pipe sealing device 10, so as to ensure that the gravel layer can be filled into the gaps between the various components of the well pipe sealing device 10 and facilitate the flatness of the plane on which the wellhead sealing device 20 and the well pipe sealing device 10 are installed.

[0033] In one implementation, a clamping ring 9 is provided on the outer side of the connection between the sleeve 7 and the second cover plate 63, and the clamping ring 9 can be connected to the outer side of the sleeve 7 and the outer side of the second cover plate 63 by welding or the like, so as to increase the connection strength between the sleeve 7 and the second cover plate 63. Ribs can also be provided on the sleeve 7 and the second cover plate 63 to support the sleeve 7 and prevent the sleeve 7 from being deformed after a structure such as a slow-setting soil layer is provided in the sleeve 7.

[0034] The second sealing disc 3 is arranged on the first sealing disc 1, and an elastic sealing member 2 for sealing the well pipe is arranged between the first sealing disc 1 and the second sealing disc 3; the diameters of the first sealing disc 1, the second sealing disc 3 and the elastic sealing member 2 are less than or equal to the diameter of the well pipe, so that when the precipitation well is sealed, the plugging device can be placed in the well pipe of the precipitation well. The elastic sealing member 2 can be a circular ring structure made of rubber material or other elastic materials, the outer ring of the elastic sealing member 2 is used to abut against the inner wall of the well pipe, the inner ring is used to connect with the sealing member transmission mechanism, and the remaining side surfaces are used to connect with the first sealing disc 1 and the second sealing disc 3.

[0035] During construction of the basement precipitation well plugging system of this embodiment, the number of well pipe sealing devices 10 used can be selected according to the depth of different precipitation wells. When the depth of the precipitation well is three meters, the number of well pipe sealing devices 10 can be set to two for illustration. During actual construction, the precipitation well can be filled with a first gravel layer 30, so that the precipitation well is filled with a layer of gravel and other building materials of about one meter, and the gravel material is compacted with tools, and then the groundwater in the precipitation well is pumped out by a water pump. After the pumping is completed, the well pipe sealing device 10 of this embodiment (for the sake of convenience, it is defined as the first well pipe sealing device 10) is placed in the drainage well, and a cylindrical tool can be used to press the seal transmission mechanism downward, so that the seal transmission mechanism first contacts the inner ring of the elastic seal 2, and then as the tool continues to press the seal transmission mechanism downward, the elastic seal 2 is elastically deformed, so that the elastic seal 2 contacts the inner wall of the well pipe, and the part of the well pipe filled with gravel is sealed. At this time, the first sealing layer is formed between the first sealing device and the bottom of the well. At the same time, the blocking mechanism 5 automatically limits the seal transmission mechanism, and then the seal transmission mechanism can still maintain the elastic deformation of the elastic seal 2 after losing the downward force of the tool alignment, thereby ensuring that the elastic seal 2 always contacts the inner wall of the well pipe. After the construction of the first plugging layer is completed, the tool is taken out and the first gravel layer 30 is continued to be filled into the precipitation well, so that the precipitation well continues to be filled with a gravel layer of about one meter, and then the second sealing device is placed in, and the elastic sealing member 2 of the second sealing device is abutted against the inner wall of the well pipe in the above manner to form a second sealing layer.

[0036] After the construction of the second sealing layer is completed, gravel is continuously filled into the precipitation well to form a second gravel layer 40, until the second gravel layer 40 is filled to the wellhead position, and the second gravel layer 40 is at a certain distance from the top surface of the wellhead. At this time, the wellhead cover plate 6 can be installed on the wellhead first, and then the groundwater collected between the wellhead cover plate 6 and the second gravel layer 40 can be pumped out by using the inner hole of the casing 7 and the groundwater outlet 61 of the wellhead cover plate 6. At this time, since the groundwater content in the construction area is relatively rich, the water pump can never pump out all the groundwater. Therefore, after the water pump has pumped out most of the groundwater, the groundwater level can be specifically at a position lower than the first cover plate 62 of the wellhead cover plate 6. The groundwater collected between the wellhead cover plate 6 and the second gravel layer 40 can be cooled by a cooling device to form a frozen layer, and liquid nitrogen can also be filled between the wellhead cover plate 6 and the second gravel layer 40 to form a frozen layer for the groundwater to prevent the groundwater from continuing to gather there. Then, the metal seal 81 is set in the casing 7, and the second step and the support assembly 82 are used to limit the metal seal 81 in the casing 7. Then, concrete is filled into the casing 7 to form a slow-setting soil layer in the inner hole of the casing 7. The concrete can be quick-drying concrete to speed up the construction progress. After the concrete layer 83 solidifies, an elastic sealing structure is set in the gap between the concrete layer 83 and the wellhead to form an elastic sealing layer 84. Finally, the casing sealing cover 85 is threadedly connected to the casing 7 by using the thread to achieve the sealing of the casing 7. After completing the sealing of the wellhead of the precipitation well, a waterproof layer can be coated on the gaps of the various component structures of the wellhead sealing device 20, specifically: a waterproof layer is provided at the connection between the wellhead cover plate 6 and the wellhead of the precipitation well, the connection between the wellhead cover plate 6 and the casing 7, and the connection between the casing 7 and the casing sealing cover 85, to further ensure the sealing effect of the wellhead sealing device 20. Finally, concrete is poured outside the wellhead sealing device 20 until it is flush with the floor of the basement, thereby completing the overall construction of the precipitation well.

[0037] In this embodiment, different numbers of well pipe sealing devices 10 are selected according to different depths of the precipitation well, and then the precipitation well is divided into different sealing layers. Different sealing layers are blocked by the well pipe sealing device 10 of this embodiment. After blocking, due to the effect of the well pipe sealing device 10, the groundwater between different sealing layers is prevented from penetrating into other sealing layers, and the amount of groundwater located at the wellhead when the wellhead sealing device 20 seals the wellhead of the precipitation well is reduced, thereby reducing the water pressure of the groundwater, and facilitating the wellhead sealing device 20 to seal the wellhead of the precipitation well. When sealing the wellhead, the wellhead cover plate 6 and the supporting assembly 82 support the metal seal 81 to form a primary seal of the wellhead, the concrete layer 83 is used to form a secondary seal in the casing 7, the elastic seal 2 is used to form a tertiary seal in the casing 7, and the casing sealing cover 85 is used to form a fourth seal by threaded connection with the casing 7, so as to prevent groundwater leakage and ensure the sealing effect of the precipitation well.

[0038] Please continue reading Figure 3-5 In one embodiment, a plurality of slots 71 are provided on the inner side wall of the sleeve 7, and the support assembly 82 includes a support rod 821, a limiting nut 822, a support seat 823, a plurality of support rods 821 and a plurality of support blocks 825; the slots 71, the support rod 821 and the support blocks 825 are provided one by one; the support rod 821 is provided on the metal seal 81, one end of the support rod 821 is rotatably connected to the support seat 823, and the other end is rotatably connected to the support block 825; a connection hole for the support rod 821 to pass through is provided in the support seat 823, and the support block 825 is used to connect with the slot 71; the limiting nut 822 is threadedly connected to the support rod 821, and is used to limit the support seat 823. When in use, the support seat 823 passes through the support rod 821 through the connection hole, and the support block 825 is provided in the slot 71, and then the upper end of the support seat 823 is positioned by the limiting nut 822, so that the support seat 823 can be fixed on the metal rod. The number of the slots 71 , the support rods 821 and the support blocks 825 may be three, four or the like, which is not limited in this embodiment.

[0039] See also Figure 6-8 In one embodiment, the sealing member transmission mechanism includes a plurality of first transmission components 41, a first transmission disk 42, a plurality of second transmission components 43, a second transmission disk 44 and a transmission shaft component 45; a plurality of guide grooves 11 for guiding the movement of the first transmission components 41 and the second transmission components 43 are arranged on the first sealing disk 1; the guide grooves 11 and the first transmission components 41 and the second transmission components 43 are arranged in a one-to-one correspondence; the first transmission component and the first guide disk are rotationally connected, and the second transmission components 43 and the second transmission disk 44 are rotationally connected; the transmission shaft component 45 is used to drive the first transmission disk 42 and the second transmission disk 44 to move, thereby driving the first transmission component 41 and the second transmission component 43 to abut against a side of the elastic seal 2 away from the well pipe, thereby driving the elastic seal 2 to undergo elastic deformation; the blocking mechanism 5 is used to limit the transmission shaft component 45.

[0040] In this embodiment, three first transmission components 41 and three second transmission components 43 can be respectively provided, and six corresponding guide grooves 11 can be provided. When the well pipe sealing device 10 is placed as a whole into the precipitation well, the transmission shaft component 45 is pressed downward by a tool to drive the first transmission component 41 and the second transmission component 43 to slide in the guide groove 11, thereby realizing the first transmission component 41 and the second transmission component 43 to cause the elastic seal 2 to undergo elastic deformation, so that the elastic seal 2 abuts against the inner wall of the well pipe.

[0041] The first transmission assembly includes a first connecting rod 411, a first slider 412 and a first abutment 413; one end of the first connecting rod 411 is rotatably connected to the first transmission disk 42, and the other end is rotatably connected to the first sliding member, the first slider 412 is arranged in the guide groove 11, and the first abutment 413 is arranged on the first slider 412; the second transmission assembly includes a second connecting rod 431, a second slider 432 and a second abutment 433; one end of the second connecting rod 431 is rotatably connected to the second transmission disk 44, and the other end is rotatably connected to the second sliding member, the second slider 432 is arranged in the guide groove 11, and the second abutment 433 is arranged on the second slider 432; the first abutment 413 and the second abutment 433 are used to abut against the elastic sealing member 2; when the elastic sealing member 2 abuts against the side wall of the well pipe, multiple first abutment members 413 and multiple second abutment members 433 are surrounded by a circular ring. The first abutment 413 and the second abutment 433 can be arc-shaped structures respectively, which are fixedly arranged on the corresponding slider. When the transmission shaft assembly 45 moves downward, it drives the first abutment 413 and the second abutment 433 to slide along the guide groove 11, so that the first abutment 413 and the second abutment 433 are enclosed to form an annular structure, so that the inner ring of the elastic seal 2 is evenly stressed, thereby ensuring that the elastic seal 2 is evenly stressed in the circumferential direction and has the same elastic deformation. In this embodiment, when not in operation, the second abutment 433 is located at a position close to the central axis of the first sealing disk 1, and the first abutment 413 is located at a position away from the central axis of the first sealing disk 1. In addition, in order to enable the first abutting member 413 and the second abutting member 433 to enclose a circular ring structure, the transmission shaft assembly 45 can first drive the first abutting member 413 to move to abut against the elastic seal 2, and after the first abutting member 413 causes the elastic seal 2 to be elastically deformed, the transmission shaft assembly 45 drives the second abutting member 433 to move to abut against the elastic seal 2. At this time, the transmission shaft assembly 45 cannot continue to drive the first abutting member 413 to move, and can still maintain the abutment between the first abutting member 413 and the elastic seal 2. When the second abutting member 433 moves to abut against the elastic seal 2, the blocking mechanism 5 limits the transmission assembly, thereby maintaining the abutment between the first abutting member 413 and the second abutting member 433 and the elastic seal 2.

[0042] See also Fig.12In one implementation, the guide groove 11 includes a first sub-guide groove 111 and two second sub-guide grooves 112; the two second sub-guide grooves 112 are respectively arranged on one of the two side walls of the first sub-guide groove 111 that are arranged opposite to each other; the first slider 412 and the second slider 432 are respectively provided with two protrusions 4121, and the protrusions 4121 are arranged one-to-one corresponding to the second sub-guide grooves 112. The provision of the second sub-guide grooves 112 ensures that the first slider 412 and the second slider 432 slide in the first sub-guide groove 111 and prevents the first slider 412 and the second slider 432 from falling out of the first sub-guide groove 111.

[0043] In one implementation, the first sealing disk 1 includes an avoidance hole and a blocking member 12, the avoidance hole is connected to a plurality of guide grooves 11, and the blocking member 12 is used to block the avoidance hole. The avoidance hole is arranged at the center of the first sealing disk 1, and the blocking member 12 is a disc-shaped structure used to block the avoidance hole. Through the arrangement of the avoidance hole and the blocking member 12, on the one hand, it is convenient for the first slider 412 and the second slider 432 to be arranged in the guide groove 11 using the avoidance hole, and on the other hand, it can also ensure that the first slider 412 and the second slider 432 slide out of the avoidance hole.

[0044] See also Figure 7-9 , 11. In one embodiment, the transmission shaft assembly 45 includes a first transmission shaft 451, a second transmission shaft 452 and a first elastic member 453; the second transmission shaft 452 is provided with a first sliding groove 4521, the center line of the first sliding groove 4521 coincides with the center axis of the second transmission shaft 452, the first elastic member 453 is arranged in the first sliding groove 4521, one end of which is connected to the bottom of the first sliding groove 4521, and the other end is connected to the first transmission shaft 451; the first transmission shaft 451 is partially arranged in the first sliding groove 4521; the second transmission disk 44 is provided with a first through hole 441, one end of the first transmission shaft 451 extending out of the first sliding groove 4521 passes through the first through hole 441 and is connected to the first transmission disk 42; one end of the second transmission shaft 452 provided with the first sliding groove 4521 is used to be connected to the second transmission disk 44; the blocking mechanism 5 is used to limit the second transmission shaft 452. Specifically, the first transmission shaft 451 and the second transmission shaft 452 are coaxially arranged, and the first transmission shaft 451 partially extends into the first sliding groove 4521; the second transmission disc 44 is provided with a first through hole 441, that is, in the up and down direction, the first transmission disc 42 is arranged between the first sealing disc 1 and the second transmission disc 44, and the diameter of the first through hole 441 can be greater than or equal to the diameter of the first transmission shaft 451, so that the first transmission shaft 451 can pass through the first through hole 441 and connect with the first transmission disc 42. The first elastic member 453 can be elastic or other elastic structures, which is not limited in this embodiment.

[0045] During construction, by pressing the transmission shaft assembly 45 downward, that is, pressing the second transmission shaft 452, the second transmission shaft 452 drives the first transmission shaft 451 to move downward through the action of the first elastic member 453, and the first transmission shaft 451 drives the first sealing disk 1 to move downward, thereby driving the first slider 412 to slide in the guide groove 11, so that the first abutment member 413 can drive the elastic sealing member 2 to elastically deform, so that it abuts against the inner wall of the well pipe. When the first abutment member 413 moves into place, the first slider 412 abuts against one end of the guide groove 11, that is, at this time, the first slider 412 cannot continue to slide. Since the first slider 412 cannot continue to slide, the first elastic member 453 is compressed in the process of the second transmission shaft 452 continuing to move downward, thereby ensuring that the second transmission shaft 452 can continue to move downward. The second transmission shaft 452 continues to move downward, driving the second transmission shaft 452 to connect with the second sealing disk 3, and then driving the second slider 432 to slide in the guide groove 11, so that the second abutment 433 abuts against the elastic seal 2, and then driving the elastic seal 2 to undergo elastic deformation, so that the outer ring of the elastic seal 2 can abut against the inner wall of the well pipe.

[0046] In one implementation, the first guide plate is provided with a first guide hole 421, the inner side wall of the first guide hole 421 is arranged obliquely with respect to the central axis of the first guide plate, and the end of the first transmission shaft 451 extending out of the first sliding groove 4521 is provided with a first guide portion 4511, and the first guide portion 4511 is used to abut against the inner side wall of the first guide hole 421. The first guide portion 4511 may be an inclined section arranged on the first transmission shaft 451, and the small end of the inclined section is arranged toward the first sealing plate 1. The arrangement of the first guide hole 421 and the first guide portion 4511 can ensure that the first group of transmission components 41 can move synchronously.

[0047] In one implementation, the first through hole 441 includes a reaming section and a straight section, the side wall of the reaming section is arranged obliquely with respect to the central axis of the second guide disk, and the second transmission shaft 452 is provided with a second guide portion 4524 at one end provided with the first sliding groove 4521, and the second guide portion 4524 is used to connect with the reaming section. Specifically, the diameter of the straight section is greater than or equal to the diameter of the first transmission shaft 451, and the second guide portion 4524 can be an inclined section provided on the second transmission shaft 452, and the small end of the inclined section is arranged toward the second sealing disk 3. By providing the reaming section and the second guide portion 4524, it can be ensured that the second group transmission assembly 43 can move synchronously.

[0048] In one embodiment, a plurality of second sliding grooves 4522 are provided on the outer side surface of the second transmission shaft 452, and a limiting hole 4523 is provided at the bottom of the second sliding groove 4522 away from the connection end of the second transmission shaft 452 and the second transmission disk 44; a third through hole for avoiding the first group of transmission components 41, the second group of transmission components 43 and the transmission shaft component 45 is provided on the second sealing disk 3; the blocking mechanism 5 includes a sealing cone 51, a plurality of second elastic members 52 and a plurality of limiting columns 53; one end of the sealing cone barrel is connected to the second sealing disk 3, and the other end is provided with a second through hole 511 for the second transmission shaft 452 to pass through, and a receiving cavity 51 for accommodating the transmission shaft component 45 is also provided in the sealing cone barrel 2. The accommodating cavity 512 is connected to the second through hole 511; the inner side wall of the second through hole 511 is provided with a plurality of mounting holes symmetrically arranged with the axis of the second through hole 511 as the symmetry line, the limiting hole 4523, the mounting hole, the second elastic member 52, and the limiting column 53 are arranged in a one-to-one correspondence, the limiting column 53 is partially arranged in the mounting hole, the second elastic member 52 is arranged in the mounting hole, one end of which is connected to the bottom of the mounting hole, and the other end is connected to the limiting column 53, and one end of the limiting column 53 extending out of the mounting hole is located in the second sliding groove 4522; when the elastic sealing member 2 abuts against the inner side wall of the well pipe, one end of the limiting column 53 extending out of the mounting hole penetrates into the limiting hole 4523, which is used to limit the second transmission shaft 452. The limiting hole 4523, the mounting hole, the second elastic member 52 and the limiting column 53 can be respectively set as individual. During construction, the second transmission shaft 452 will move downward. At this time, the limiting column 53 slides in the second sliding groove 4522. When the second transmission shaft 452 moves to the right position, the limiting column 53 extends into the limiting hole 4523 through the action of the second elastic member 52, so that the second transmission shaft 452 cannot continue to move downward or upward. It can be understood that when the limiting column 53 extends into the limiting hole 4523, a part of the limiting column 53 is still located in the mounting hole. In this embodiment, the second elastic member 52 is a spring. In other implementations, the second elastic member 52 can also be other structures, which is not limited in this embodiment. In one implementation, in order to reduce the friction between the limiting column 53 and the second sliding groove 4522, the connecting section of the limiting column 53 and the second sliding groove 4522 can be set to an arc shape.

[0049] In one embodiment, the blocking mechanism 5 further includes a sealing cover 54, and a connecting portion 513 is provided at one end of the sealing cone 51 away from the second sealing disk 3, and the sealing cover 54 is connected to the connecting portion 513 by threads, and is used to close the second through hole 511. The connecting portion 513 can be a hollow cylindrical structure coaxially arranged with the second through hole 511, and its outer side surface is provided with an external thread, and the inner side surface of the sealing cover 54 is provided with an internal thread, and the sealing cover 54 and the connecting portion 513 are connected by threads. The provision of the sealing cover 54 can effectively avoid the problem that the well pipe sealing device 10 cannot be smoothly installed in the precipitation well due to the limit column 53 extending into the limit hole 4523 due to the accidental contact with the second transmission shaft 452 during the transportation process.

[0050] Another aspect of the present invention further provides a method for plugging a basement dewatering well, comprising: The first gravel layer filling step is: filling gravel materials into the precipitation well to form a first gravel layer 30; after the first gravel layer 30 is filled, compacting the first gravel layer 30 using tools.

[0051] Installation steps of the well pipe sealing device: place the well pipe sealing device 10 into the well pipe of the precipitation well, press the seal transmission mechanism downward so that the seal transmission mechanism first abuts against the inner ring of the elastic seal 2, and then continue to press the seal transmission mechanism downward to cause the elastic seal 2 to undergo elastic deformation and abut against the inner wall of the well pipe.

[0052] Second gravel layer filling step: filling gravel material into the precipitation well to form a second gravel layer 40; after the second gravel layer 40 is filled, compacting the second gravel layer 40 using tools.

[0053] The installation steps of the wellhead sealing device are as follows: first, apply cement mortar at the connection between the wellhead cover plate 6 and the wellhead, and install the wellhead cover plate 6 on the wellhead; then install the metal seal 81 into the casing 7, and use the support assembly 82 to limit the metal seal 81 in the casing 7, and then fill the casing 7 with concrete to form a slow-setting soil layer. After the concrete layer 83 is formed, an elastic sealing layer 84 is set on the concrete layer 83, and finally the casing 7 is sealed with a casing sealing cover 85.

[0054] In summary, the present invention arranges a well pipe sealing device 10 and a wellhead sealing device 20 in the well pipe of the dewatering well, and the well pipe sealing device 10 includes a first sealing disk 1, an elastic seal 2, a second sealing disk 3, a seal transmission mechanism and a blocking mechanism 5; when in use, the elastic seal 2 is elastically deformed by the driving of the seal transmission mechanism, so that the elastic seal 2 is abutted against the inner wall of the well pipe, thereby realizing segmented sealing inside the dewatering well, reducing the amount of groundwater at the wellhead when the wellhead sealing device 20 seals the wellhead of the dewatering well, thereby reducing the water pressure of the groundwater, making it easier for the wellhead sealing device 20 to seal the wellhead of the dewatering well, and a blocking mechanism 5 is provided, which can maintain the elastic seal 2 abutting against the inner wall of the well pipe after the seal transmission mechanism moves into place, thereby ensuring the sealing effect of the sealing device. The wellhead sealing device 20 forms a primary seal of the wellhead by using the wellhead cover plate 6 and the supporting assembly 82 to support the metal seal 81, forms a secondary seal in the casing 7 by using the concrete layer 83, forms a tertiary seal in the casing 7 by using the elastic seal 2, and forms a quaternary seal by using the threaded connection between the casing sealing cover 85 and the casing 7, thereby preventing groundwater leakage and ensuring the sealing effect of the precipitation well. Therefore, the present invention effectively overcomes various shortcomings in the prior art and has a high industrial utilization value.

[0055] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A basement drainage well blocking system, characterized in that: The plugging system comprises: a well pipe sealing device, a wellhead sealing device, a first crushed stone layer and a second crushed stone layer; the well pipe sealing device is used to seal the well pipe of the dewatering well, and the wellhead sealing device is used to seal the wellhead of the dewatering well; the first crushed stone layer is arranged between the bottom of the dewatering well and the well pipe sealing device, and the second crushed stone layer is arranged between the well pipe sealing device and the wellhead sealing device; The wellhead sealing device of the precipitation well comprises: a wellhead cover plate, a casing and a plugging structure; the wellhead cover plate comprises a groundwater outlet, the casing is fixed on the wellhead cover plate, and the inner hole of the casing is connected with the groundwater outlet; the plugging structure is used to plug the inner hole of the casing; the plugging structure comprises a metal seal, a support assembly, a concrete layer, an elastic sealing layer and a casing sealing cover arranged from bottom to top in the casing; the support assembly is used to fix the metal seal in the casing; the elastic sealing layer is used to fill the gap between the concrete layer and the casing sealing cover; The well pipe sealing device includes: a first sealing disk, an elastic seal, a second sealing disk, a seal transmission mechanism and a blocking mechanism; the elastic seal is arranged between the first sealing disk and the second sealing disk, and the seal transmission mechanism is slidably arranged on the first sealing disk, and is used to drive the elastic seal to undergo elastic deformation so that the elastic seal abuts against the inner wall of the well pipe of the dewatering well to seal the well pipe; the blocking mechanism is arranged on the second sealing disk, and when the elastic seal abuts against the inner wall of the well pipe, the blocking mechanism is used to limit the seal transmission mechanism to maintain the abutment between the elastic seal and the inner wall of the well pipe of the dewatering well.

2. A basement drainage well plugging system according to claim 1, characterized in that: A second step for limiting the position of the metal seal is provided on the inner side wall of the groundwater outlet of the wellhead cover; A plurality of slots are arranged on the inner side wall of the sleeve, and the support assembly comprises a support rod, a limit nut, a support seat, a plurality of support rods and a plurality of support blocks; the slots, support rods and support blocks are arranged in a one-to-one correspondence; The support rod is arranged on the metal seal, one end of the support rod is rotatably connected to the support seat, and the other end is rotatably connected to the support block; a connecting hole for the support rod to pass through is provided in the support seat, and the support block is used to connect with the slot; the limit nut is threadedly connected to the support rod and is used to limit the support seat.

3. A basement drainage well blocking system according to claim 2, characterized in that: The casing sealing cover is connected to the casing via threads; And / or, a waterproof layer is provided at the connection between the wellhead cover plate and the wellhead of the precipitation well, the connection between the wellhead cover plate and the casing, and the connection between the casing and the casing sealing cover.

4. The basement drainage well blocking system according to claim 1, characterized in that: The seal transmission mechanism comprises a plurality of first transmission assemblies, a first transmission disc, a plurality of second transmission assemblies, a second transmission disc and a transmission shaft assembly; The first sealing disk is provided with a plurality of guide grooves for guiding the movement of the first and second transmission components; the guide grooves and the first and second transmission components are arranged in one-to-one correspondence; The first transmission assembly is rotatably connected to the first guide plate, and the second transmission assembly is rotatably connected to the second transmission plate; The transmission shaft assembly is used to drive the first transmission disc and the second transmission disc to move, thereby driving the first group of transmission components and the second group of transmission components to abut against a side of the elastic seal away from the well pipe, thereby driving the elastic seal to undergo elastic deformation; The blocking mechanism is used to limit the transmission shaft assembly.

5. A basement drainage well plugging system according to claim 4, characterized in that: The first transmission assembly includes a first connecting rod, a first slider and a first abutment member; one end of the first connecting rod is rotatably connected to the first transmission disk, and the other end is rotatably connected to the first slider, the first slider is arranged in the guide groove, and the first abutment member is arranged on the first slider; The second transmission assembly includes a second connecting rod, a second slider and a second abutment member; one end of the second connecting rod is rotatably connected to the second transmission plate, and the other end is rotatably connected to the second sliding member, the second slider is arranged in the guide groove, and the second abutment member is arranged on the second slider; The first abutment member and the second abutment member are used to abut against the elastic sealing member; when the elastic sealing member abuts against the side wall of the well pipe, a plurality of the first abutment members and a plurality of the second abutment members are surrounded into a circular ring shape.

6. A basement drainage well plugging system according to claim 5, characterized in that: The guide groove comprises a first sub-guide groove and two second sub-guide grooves; the two second sub-guide grooves are respectively arranged on one of the two side walls of the first sub-guide groove which are arranged opposite to each other; the first slider and the second slider are respectively provided with two protrusions, and the protrusions are arranged in one-to-one correspondence with the second sub-guide grooves; And / or, the first sealing disk includes an avoidance hole and a blocking member, the avoidance hole is connected to the plurality of guide grooves, and the blocking member is used to block the avoidance hole.

7. The basement drainage well blocking system according to claim 4, characterized in that: The transmission shaft assembly includes a first transmission shaft, a second transmission shaft and a first elastic member; The second transmission shaft is provided with a first sliding groove, the center line of the first sliding groove coincides with the center axis of the second transmission shaft, the first elastic member is arranged in the first sliding groove, one end of the first elastic member is connected to the bottom of the first sliding groove, and the other end is connected to the first transmission shaft; the first transmission shaft is partially arranged in the first sliding groove; The second transmission plate is provided with a first through hole, and one end of the first transmission shaft extending out of the first sliding slot passes through the first through hole and is connected to the first transmission plate; one end of the second transmission shaft provided with the first sliding slot is used to be connected to the second transmission plate; The blocking mechanism is used to limit the second transmission shaft.

8. A basement drainage well plugging system according to claim 7, characterized in that: A plurality of second sliding grooves are arranged on the outer side surface of the second transmission shaft, and a limiting hole is arranged at the bottom of the second sliding groove away from the connection end between the second transmission shaft and the second transmission plate; a third through hole is arranged on the second sealing plate for avoiding the first transmission assembly, the second transmission assembly and the transmission shaft assembly; The blocking mechanism includes a sealing cone, a plurality of second elastic members and a plurality of limiting columns; one end of the sealing cone barrel is connected to the second sealing disk, and the other end is provided with a second through hole for the second transmission shaft to pass through; the sealing cone barrel is also provided with a accommodating chamber for accommodating the transmission shaft assembly, and the accommodating chamber is connected to the second through hole; the inner side wall of the second through hole is provided with a plurality of mounting holes symmetrically arranged with the second through hole axis as the symmetry line, the limiting hole, the mounting hole, the second elastic member, and the limiting column are arranged in a one-to-one correspondence, the limiting column is partially arranged in the mounting hole, the second elastic member is arranged in the mounting hole, one end of the limiting member is connected to the bottom of the mounting hole, and the other end is connected to the limiting column, and one end of the limiting column extending out of the mounting hole is located in the second sliding groove; when the elastic sealing member abuts against the inner side wall of the well pipe, the end of the limiting column extending out of the mounting hole penetrates into the limiting hole for limiting the second transmission shaft.

9. A basement drainage well plugging system according to claim 8, characterized in that: The blocking mechanism further comprises a sealing cover. A connecting portion is disposed at one end of the sealing cone away from the second sealing disk. The sealing cover is connected to the connecting portion via threads for closing the second through hole.

10. A method for plugging a basement drainage well, characterized in that: The basement drainage well plugging system comprises the basement drainage well plugging system according to any one of claims 1 to 9, and further comprises: First gravel layer filling step: filling gravel material into the precipitation well to form a first gravel layer; The installation steps of the well pipe sealing device are as follows: the well pipe sealing device is placed in the well pipe of the precipitation well, and the sealing transmission mechanism is pressed downward to make the sealing transmission mechanism contact with the inner ring of the elastic sealing member first, and then the sealing transmission mechanism is pressed downward continuously to make the elastic sealing member elastically deformed, so that the elastic sealing member contacts with the inner wall of the well pipe; Second gravel layer filling step: filling gravel material into the precipitation well to form a second gravel layer; The installation steps of the wellhead sealing device are as follows: first, apply cement mortar at the connection between the wellhead cover and the wellhead, and install the wellhead cover on the wellhead; then install the metal seal into the casing, and use the support assembly to limit the metal seal in the casing, and then fill the casing with concrete to form a slow-setting soil layer. After the concrete layer is formed, an elastic sealing layer is set on the concrete layer, and finally the casing is sealed with a casing sealing cover.

Images