Deep foundation pit basement dewatering well plugging structure and construction method

Abstract

The deep foundation pit basement dewatering well plugging structure comprises a floor, an embedded sleeve and a dewatering well, the embedded sleeve is arranged on the floor in a penetrating mode, the dewatering well is sleeved with the embedded sleeve, the floor is provided with a sinking groove, the upper end of the embedded sleeve is located in the sinking groove, and a cover plate is arranged at the upper end of the embedded sleeve; the cover plate is used for opening and closing an upper end opening of the embedded sleeve, a sealing piece is arranged between the embedded sleeve and the cover plate, the embedded sleeve is fixedly connected with the cover plate through a fastener, and concrete is poured into the sinking groove and wraps the upper end of the cover plate and the upper end of the embedded sleeve. The embedded sleeve is arranged on the circumferential outer wall of the well casing of the dewatering well in a sleeving mode and embedded in concrete of the floor, the sinking groove is reserved in the position, located at the upper end of the embedded sleeve, of the floor, the end opening of the upper end of the embedded sleeve is located in the sinking groove, the cover plate is installed at the end opening of the upper end of the embedded sleeve, and the cover plate is fixedly connected with the embedded sleeve through the fastener; and the sealing performance is improved through sealing, and the plugging quality is improved.

Description

Technical Field

[0001] This application relates to the technical field of building construction, and in particular to a plugging structure and construction method for dewatering wells in the basement of a deep foundation pit. Background Art

[0002] The general current situation in this field: In current urban construction, deep foundation pit projects are increasingly applied to large infrastructure projects. In order to prevent groundwater from seeping into the foundation pit, dewatering wells are usually set up to lower the groundwater level. However, after the foundation pit construction is completed, how to effectively plug these dewatering wells has become an important issue. Existing plugging methods mostly rely on traditional cement slurry perfusion or concrete backfilling. Although they can achieve the plugging purpose to a certain extent, there are also some obvious deficiencies.

[0003] Specific solutions of the prior art: Several commonly used dewatering well plugging methods currently include: Cement slurry perfusion method: By injecting high-concentration cement slurry into the dewatering well, a sealing layer is formed after it solidifies. This method has a low cost, but the operation is complex, leakage of slurry is likely to occur, and the curing time is long, affecting the construction progress. Concrete backfilling method: Pour concrete into the dewatering well, and rely on its self-weight and the strength after hardening to achieve plugging. This method is relatively simple, but it is difficult to ensure uniform filling under deep well conditions, and voids are easily generated, resulting in an unsatisfactory plugging effect. Grouting pipe plugging method: Use pre-buried grouting pipes to inject different types of slurries multiple times to gradually improve the plugging quality. This method can effectively avoid the limitations of single materials, but the equipment investment is large and the operation is cumbersome.

[0004] Due to the rapid rise of the water level after stopping dewatering, there are no water sealing and air sealing measures, the construction speed of the plugging method is slow, the success rate of one-time plugging is low, and plugging failure often occurs. Especially when plugging the dewatering well later, when the water flow in the dewatering well is large, the water flow is easy to gush out from the wellhead of the dewatering well and wash away the concrete, resulting in difficulty in the concrete coagulation, thus leading to a decline in the plugging quality of the dewatering well and easy occurrence of water seepage phenomena, which need to be improved. Summary of the Invention

[0005] The purpose of this application is to provide a plugging structure and construction method for dewatering wells in the basement of a deep foundation pit to solve the problem that when the water flow in the dewatering well is large, it is easy to gush out from the wellhead and wash away the concrete, resulting in a decline in the plugging quality.

[0006] In the first aspect, a plugging structure for dewatering wells in the basement of a deep foundation pit provided by this application adopts the following technical solution: A plugging structure for a dewatering well in a deep foundation pit basement, comprising a floor, a pre-embedded casing penetrating through the floor, and a dewatering well. The pre-embedded casing is sleeved outside the dewatering well. The floor is provided with a sunken groove. The upper end of the pre-embedded casing is located in the sunken groove. A cover plate is arranged at the upper end of the pre-embedded casing, and the cover plate is used to open and close the upper end port of the pre-embedded casing. A sealing member is arranged between the pre-embedded casing and the cover plate. The pre-embedded casing and the cover plate are fixedly connected by fasteners. The sunken groove is filled with concrete and covers the cover plate and the upper end of the pre-embedded casing.

[0007] By adopting the above technical solution, when pouring the floor of the basement, the pre-embedded casing is sleeved on the outer wall of the well pipe of the dewatering well and pre-embedded in the concrete of the floor. A sunken groove is left at the position of the floor where the upper end of the pre-embedded casing is located, and it is subsequently closed by secondary pouring with sealing concrete. The upper end port of the pre-embedded casing is located in the sunken groove. When plugging the well subsequently, first lower the water level in the dewatering well, install the cover plate at the upper end port of the pre-embedded casing, fix it by fasteners, and improve the sealing performance through the seal to improve the plugging quality and the one-time survival rate.

[0008] Optionally, a water stop steel plate is arranged on the outer circumferential wall of the pre-embedded casing. A water stop strip is arranged on one side of the water stop steel plate, and the inner circumferential wall of the water stop strip fits against the outer circumferential wall of the pre-embedded casing.

[0009] By adopting the above technical solution, the water stop steel plate and the water stop strip are set to effectively improve the waterproof performance between the outer circumferential wall of the pre-embedded casing and the floor, effectively reduce the water in the dewatering well from entering between the outer circumferential wall of the pre-embedded casing and the floor, and improve the plugging quality.

[0010] Optionally, the sealing member is a sealing ring. An internal thread portion is arranged on the inner circumferential wall at the upper end of the pre-embedded casing. The sealing ring includes an extension portion, and an external thread portion matching with the internal thread portion is arranged on the extension portion.

[0011] By adopting the above technical solution, the cooperation between the internal thread portion and the external thread portion improves the installation stability between the sealing ring and the pre-embedded casing. At the same time, the thread cooperation has high sealing performance, effectively reducing the water passing between the outer circumferential wall of the extension portion and the inner circumferential wall of the pre-embedded casing, and improving the waterproof performance and the plugging quality.

[0012] Optionally, a support flange corresponding to the cover plate is arranged at the upper end of the pre-embedded casing. The sealing ring further includes an annular portion arranged on the extension portion, and the annular portion is located between the support flange and the cover plate on the opposite sides.

[0013] By adopting the above technical solution, through the cooperation of the supporting flange and the cover plate, the installation contact surface between the upper end of the embedded casing and the cover plate is increased, the installation stability of the two is improved, and at the same time, through the annular part between the embedded casing and the cover plate, the sealing performance and the plugging quality are improved.

[0014] Optionally, a buffer airbag is embedded in the annular part, the buffer airbag is filled with gas or liquid, a plurality of contact airbags are arranged at intervals on the inner circumference of the annular part, the contact airbags are connected to the buffer airbag through connecting pipes, and the connecting pipes are integrally formed with the annular part.

[0015] By adopting the above technical solution, when the water level in the precipitation well rises, it will squeeze the contact airbags located inside the annular part, so that the filling in the contact airbags is squeezed into the buffer airbag through the connecting pipes, causing the annular part to expand further. The annular part will further fit the side walls of the supporting flange and the cover plate, further improving the sealing performance and the plugging quality, and effectively reducing the water seepage caused by the rising water level.

[0016] Optionally, hook parts are arranged on both opposite sides of the annular part, a limiting airbag located inside the hook part and communicating with the buffer airbag is arranged on the buffer airbag, and grooves matching the corresponding hook parts are arranged on both the supporting flange and the cover plate. The grooves extend step by step from the direction away from the annular part to the direction close to the annular part.

[0017] By adopting the above technical solution, the groove extends from the direction away from the annular part to the direction close to the annular part. When the hook part enters the groove, a certain force-bearing effect can be formed. At the same time, when the water level rises, when the filling enters the buffer airbag, it can also enter the limiting airbag. The expansion trend of the limiting airbag causes the hook part to expand, further filling in the groove, and can reduce the displacement of the buffer airbag during the expansion process.

[0018] The limiting airbag can also play a buffering effect on the buffer airbag to prevent the buffer airbag from expanding excessively.

[0019] When the hook part expands and fills in the groove, through the shape matching of the groove, while the annular part is pressed tightly against the supporting flange, the cover plate can also be pressed tightly against the annular part, effectively reducing the displacement of the cover plate during the expansion of the annular part and effectively enhancing the sealing performance.

[0020] Optionally, a groove is arranged on the groove wall of the groove, a water stop film is arranged at the notch of the groove, one side of the hook part is attached to the water stop film, a movable part is slidably arranged in the groove, a reset part is arranged at one end of the movable part, and the other end abuts against the water stop film and tends to make the water stop film protrude into the groove. A fastening rope is arranged in the cover plate, one end of the fastening rope is connected to the supporting flange, and the other end is connected to the movable part.

[0021] By adopting the above technical solution, the bent hook part expands and fills the groove, and the bent hook part presses against the water stop film to make the water stop film sink into the groove, thereby pushing the movable part to displace. The reset part is stressed and elastically deformed. During the displacement of the movable part, the fastening rope is pulled, which can tend to clamp the annular part towards the support flange by the cover plate, effectively reducing the displacement of the cover plate during the expansion of the annular part.

[0022] In a second aspect, a construction method of a deep foundation pit basement dewatering well plugging structure provided by the present application adopts the following technical solution, including the following steps: Lower the water level, lower the water level in the dewatering well so that the water level is lower than the floor of the basement; Install the embedded casing, cut off the upper end of the dewatering well so that the new port of the dewatering well is located below the upper end port of the embedded casing; Install the cover plate, set the cover plate at the upper end of the embedded casing, and close the upper end port of the embedded casing, and fixedly connect through fasteners; Pour concrete, pour the sealing concrete into the sinking groove, and the sealing concrete covers the upper ends of the cover plate and the embedded casing.

[0023] By adopting the above technical solution, when pouring the floor of the basement, the embedded casing is sleeved on the outer wall of the well pipe of the dewatering well and embedded in the concrete of the floor. A sinking groove is formed at the position of the floor above the upper end of the embedded casing, and it is reserved for subsequent secondary pouring and sealing with the sealing concrete. The upper end port of the embedded casing is located in the sinking groove. When plugging the well subsequently, first lower the water level in the dewatering well, install the cover plate at the upper end port of the embedded casing, fixedly connect through fasteners, and improve the sealing performance through sealing, thereby improving the plugging quality and the one-time survival rate.

[0024] In summary, the present application includes at least one of the following beneficial technical effects: 1. When pouring the floor of the basement, the embedded casing is sleeved on the outer wall of the well pipe of the dewatering well and embedded in the concrete of the floor. A sinking groove is formed at the position of the floor above the upper end of the embedded casing, and it is reserved for subsequent secondary pouring and sealing with the sealing concrete. The upper end port of the embedded casing is located in the sinking groove. When plugging the well subsequently, first lower the water level in the dewatering well, install the cover plate at the upper end port of the embedded casing, fixedly connect through fasteners, and improve the sealing performance through sealing, thereby improving the plugging quality and the one-time survival rate; 2. When the water level in the precipitation well rises, it will squeeze the contact airbag inside the annular part, causing the filler in the contact airbag to be squeezed into the buffer airbag through the connecting pipe, further expanding the annular part. As a result, the annular part will further fit the side walls of the support flange and the cover plate, further improving the sealing performance and plugging quality, and effectively reducing the water seepage caused by the rising water level. 3. The hook part expands and fills the groove. Through the shape matching of the groove, while the annular part is pressed tightly against the support flange, the cover plate can also be pressed tightly against the annular part, effectively reducing the displacement of the cover plate during the expansion process of the annular part and effectively enhancing the sealing performance. 4. The hook part expands and fills the groove. The hook part presses tightly against the water stop film, causing the water stop film to sink into the groove, thereby pushing the movable part to displace. The reset part is stressed and undergoes elastic deformation. During the displacement of the movable part, the fastening rope is pulled, which can tend to clamp the annular part by the cover plate towards the direction of the support flange, effectively reducing the displacement of the cover plate during the expansion process of the annular part. Description of the Drawings

[0025] Figure 1 is the overall structural schematic diagram of the embodiment of the present application; Figure 2 is the cross-sectional schematic diagram of the embodiment of the present application; Figure 3 is the enlarged schematic diagram at A of the embodiment of the present application.

[0026] Description of the Reference Numerals: 1. Floor; 11. Sinking groove; 2. Embedded casing; 21. Water stop steel plate; 22. Water stop strip; 23. Internal thread part; 24. Support flange; 25. Groove; 26. Groove; 27. Water stop film; 3. Precipitation well; 4. Cover plate; 5. Sealing member; 51. Extension part; 52. External thread part; 53. Annular part; 54. Buffer airbag; 55. Contact airbag; 56. Connecting pipe; 57. Hook part; 58. Limit airbag; 6. Fastener; 7. Movable part; 71. Reset part; 72. Fastening rope. Detailed Embodiment

[0027] The following is a further detailed description of the present application in conjunction with the attached Figure 1 - attached Figure 3 drawings.

[0028] Embodiment 1 of the present application discloses a plugging structure for a deep foundation pit basement precipitation well.

[0029] Refer to Figure 1 , Figure 2, A plugging structure for a dewatering well in a deep foundation pit basement, including a floor 1 arranged on the basement floor, a pre-embedded casing 2, and a dewatering well 3. The floor 1 is provided with an installation well through it. The dewatering well 3 is located in the installation well, and the pre-embedded casing 2 is also installed in the installation well and sleeved between the circumferential outer wall of the dewatering well 3 and the circumferential inner wall of the installation well. An installation groove 11 communicating with the installation well is opened at the upper end of the floor 1. The upper end of the pre-embedded casing 2 is located in the installation groove 11. A cover plate 4 for opening and closing the upper end port of the pre-embedded casing 2 is arranged at the upper end of the pre-embedded casing 2. A sealing member 5 is arranged between the pre-embedded casing 2 and the cover plate 4, and the pre-embedded casing 2 and the cover plate 4 are fixedly connected through a fastener 6. The fastener 6 is a fastening bolt or the like. Concrete is poured in the installation groove 11 to cover the upper ends of the cover plate 4 and the pre-embedded casing 2 together.

[0030] Refer to Figure 2 , Figure 3 , A ring-shaped waterstop steel plate 21 is fixedly connected to the circumferential outer wall of the middle part of the pre-embedded casing 2 located in the installation well. A waterstop strip 22 is fixedly connected to one side of the waterstop steel plate 21. The waterstop strip 22 is a water-swelling waterstop strip 22, and the circumferential inner wall of the waterstop strip 22 is attached to the circumferential outer wall of the pre-embedded casing 2. At the same time, both the waterstop steel plate 21 and the waterstop strip 22 are embedded in the well wall of the installation well.

[0031] Refer to Figure 2 , Figure 3 , The sealing member 5 is a sealing ring made of rubber or the like. An internal thread part 23 is opened on the circumferential inner wall of the upper end of the pre-embedded casing 2. The sealing ring includes an annular extension part 51. The extension part 51 is sleeved inside the upper end of the pre-embedded casing 2, and an external thread part 52 matching with the internal thread part 23 is opened on the circumferential outer wall of the extension part 51.

[0032] Refer to Figure 2 , Figure 3 , A support flange 24 corresponding to the cover plate 4 is integrally formed at the upper end of the pre-embedded casing 2. The sealing ring further includes an annular part 53 integrally formed at one end of the extension part 51. The annular part 53 is located between the support flange 24 and the cover plate 4 on the opposite sides.

[0033] Refer to Figure 2 , Figure 3 , A buffer airbag 54 is embedded in the annular part 53. The buffer airbag 54 is filled with gas or liquid. A plurality of contact airbags 55 are arranged at intervals on the circumferential inner side of the annular part 53. The contact airbags 55 are connected to the buffer airbag 54 through a connecting pipe 56. The connecting pipe 56 is integrally formed with the annular part 53. One end of the connecting pipe 56 is fixedly connected and communicated with the contact airbag 55, and the other end is fixedly connected and communicated with the buffer airbag 54.

[0034] Refer to Figure 2 , Figure 3, on both opposite sides of the annular portion 53, a plurality of hook portions 57 are integrally formed. The buffer airbag 54 is integrally formed with limiting airbags 58 that correspond one-to-one with the hook portions 57 and are embedded in the hook portions 57. The limiting airbags 58 communicate with the buffer airbag 54. The support flange 24 and the cover plate 4 are both provided with grooves 25 that cooperate with the corresponding hook portions 57. The grooves 25 extend step by step from the direction away from the annular portion 53 to the direction close to the annular portion 53. At the notch of the groove 25, a chamfer is provided to facilitate the embedding of the limiting airbag 58.

[0035] Refer to Figure 2 , Figure 3 , on the groove wall of the groove 25 located on the cover plate 4, a groove 26 is provided. A water stop film 27 is fixedly connected to the notch of the groove 26. The water stop film 27 covers the notch of the groove 26 to achieve a sealing effect. One side of the hook portion 57 is attached to the side wall of the water stop film 27. A movable member 7 is slidably connected in the groove 26. The movable member 7 is a movable block that reciprocally slides along the depth direction of the groove 26. One end of the movable block is connected to a reset member 71, and the other end abuts against the water stop film 27 and tends to make the water stop film 27 protrude into the groove 25. The reset member 71 is a reset spring. One end of the reset spring is fixedly connected to the movable block, and the other end is fixedly connected to the groove wall of the groove 26. A fastening rope 72 is passed through the cover plate 4. One end of the fastening rope 72 is fixedly connected to the upper end of the support flange 24, and the other end is fixedly connected to the movable member 7. When the water stop film 27 is recessed into the groove 26, the movable member 7 moves and tightens the fastening rope 72.

[0036] The implementation principle of the deep foundation pit basement dewatering well plugging structure in Embodiment 1 of the present application is as follows: When pouring the floor 1 of the basement, the embedded sleeve 2 is sleeved on the outer circumference of the well pipe of the dewatering well 3 and embedded in the concrete of the floor 1. A sinking groove 11 is left at the position of the floor 1 above the embedded sleeve 2 for subsequent secondary pouring and sealing with closed concrete. The upper end port of the embedded sleeve 2 is located in the sinking groove 11. When plugging the well subsequently, first lower the water level in the dewatering well 3, and install the cover plate 4 at the upper end port of the embedded sleeve 2 and fixedly connect it through the fastener 6.

[0037] The cooperation between the internal thread portion 23 and the external thread portion 52 improves the installation stability between the sealing ring and the embedded sleeve 2. At the same time, the thread fit has high tightness, effectively reducing the water passing between the outer circumference of the extension portion 51 and the inner circumference of the embedded sleeve 2, improving the waterproof performance and plugging quality.

[0038] When the water level in the precipitation well 3 rises, it will squeeze the contact airbag 55 inside the annular part 53, causing the filler in the contact airbag 55 to be squeezed into the buffer airbag 54 through the connecting pipe 56, further expanding the annular part 53. The annular part 53 will then further fit the side walls of the support flange 24 and the cover plate 4, further improving the sealing performance and plugging quality, and effectively reducing the water seepage caused by the rising water level.

[0039] The groove 25 extends from the direction away from the annular part 53 and then towards the annular part 53. When the hook part 57 enters the groove 25, it can form a certain force effect. At the same time, when the water level rises, while the filler enters the buffer airbag 54, it can also enter the limit airbag 58. The expansion trend of the limit airbag 58 causes the hook part 57 to expand and further fill the groove 25, which can reduce the displacement of the buffer airbag 54 during the expansion process. The limit airbag 58 can also play a buffering effect on the buffer airbag 54 to prevent the buffer airbag 54 from over-expanding. When the hook part 57 expands and fills the groove 25, through the shape matching of the groove 25, while the annular part 53 is pressed against the support flange 24, the cover plate 4 can also be pressed against the annular part 53.

[0040] When the hook part 57 expands and fills the groove 25, the hook part 57 presses against the water stop film 27, causing the water stop film 27 to sink into the groove 26, thereby pushing the movable part 7 to displace. The reset part 71 is stressed and undergoes elastic deformation. During the displacement of the movable part 7, the fastening rope 72 is pulled, which can cause the cover plate 4 to clamp the annular part 53 towards the direction of the support flange 24.

[0041] Embodiment 1 of the present application discloses a construction method for a precipitation well in a deep foundation pit basement.

[0042] The following technical solutions are adopted, including the following steps: Lower the water level, lower the water level in the precipitation well 3 so that the water level is lower than the floor 1 of the basement. Install the embedded casing 2, cut off the upper end of the precipitation well 3 so that the new port of the precipitation well 3 is located below the upper port of the embedded casing 2. Install the cover plate 4, set the cover plate 4 at the upper end of the embedded casing 2, and seal the upper port of the embedded casing 2, and fix and connect it through the fastener 6. Pour concrete, pour the sealing concrete into the sinking groove 11, and the sealing concrete covers the upper ends of the cover plate 4 and the embedded casing 2.

[0043] The above are all the preferred embodiments of the present application. Without restricting the protection scope of the present application accordingly, therefore: All equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A deep foundation pit basement dewatering well blocking structure, characterized by: The invention comprises a floor (1), an embedded sleeve (2) penetrating the floor (1), and a drainage well (3), wherein the embedded sleeve (2) is sleeved on the outside of the drainage well (3), the floor (1) is provided with a sinking groove (11), the upper end of the embedded sleeve (2) is located in the sinking groove (11), a cover plate (4) is provided at the upper end of the embedded sleeve (2), the cover plate (4) is used to open and close the upper end port of the embedded sleeve (2), a sealing member (5) is provided between the embedded sleeve (2) and the cover plate (4), the embedded sleeve (2) and the cover plate (4) are fixedly connected by a fastener (6), and concrete is poured into the sinking groove (11) and covers the cover plate (4) and the upper end of the embedded sleeve (2).

2. The deep foundation pit basement drainage well blocking structure according to claim 1 is characterized by: The circumferential outer wall of the embedded sleeve (2) is provided with a waterstop steel plate (21), one side of the waterstop steel plate (21) is provided with a waterstop strip (22), and the circumferential inner wall of the waterstop strip (22) is in contact with the circumferential outer wall of the embedded sleeve (2).

3. The deep foundation pit basement drainage well blocking structure according to claim 1 is characterized by: The sealing member (5) is a sealing ring. The circumferential inner wall of the upper end of the embedded sleeve (2) is provided with an internal threaded portion (23). The sealing ring includes an extension portion (51). The extension portion (51) is provided with an external threaded portion (52) that cooperates with the internal threaded portion (23).

4. The deep foundation pit basement drainage well blocking structure according to claim 3 is characterized by: The upper end of the embedded sleeve (2) is provided with a supporting flange (24) corresponding to the cover plate (4), and the sealing ring also includes an annular portion (53) arranged on the extension portion (51), and the annular portion (53) is located between the supporting flange (24) and the cover plate (4) on the opposite side.

5. The deep foundation pit basement dewatering well blocking structure and construction method according to claim 4 is characterized by: A cushioning airbag (54) is embedded in the annular portion (53), and the cushioning airbag (54) is filled with gas or liquid. A plurality of contact airbags (55) are arranged at intervals on the inner side of the annular portion (53) in the circumferential direction. The contact airbags (55) are connected to the cushioning airbag (54) via a connecting tube (56), and the connecting tube (56) is integrally formed with the annular portion (53).

6. The deep foundation pit basement drainage well blocking structure according to claim 5 is characterized by: The annular portion (53) is provided with hook portions (57) on both sides facing each other, the buffer airbag (54) is provided with a limiting airbag (58) located in the hook portion (57) and connected to the buffer airbag (54), the supporting flange (24) and the cover plate (4) are both provided with grooves (25) cooperating with the corresponding hook portions (57), and the grooves (25) extend step by step from a direction away from the annular portion (53) and then to a direction close to the annular portion (53).

7. The deep foundation pit basement drainage well blocking structure according to claim 6 is characterized by: The groove wall of the groove (25) is provided with a groove (26), and the notch of the groove (26) is provided with a water-stopping membrane (27). One side of the hook portion (57) is in contact with the water-stopping membrane (27). A movable part (7) is slidably provided in the groove (26). A reset part (71) is provided at one end of the movable part (7), and the other end is in contact with the water-stopping membrane (27) and tends to cause the water-stopping membrane (27) to protrude into the groove (25). A fastening rope (72) is provided in the cover plate (4), and one end of the fastening rope (72) is connected to the supporting flange (24), and the other end is connected to the movable part (7).

8. A construction method for the deep foundation pit basement drainage well plugging structure according to claims 1-7, characterized in that: The following steps are involved: Lowering the water level, lowering the water level in the precipitation well (3) so that the water level is below the basement floor (1); Install the embedded casing (2), cut off the upper end of the drainage well (3), so that the new port of the drainage well (3) is arranged below the upper end port of the embedded casing (2); Installing the cover plate (4), arranging the cover plate (4) on the upper end of the embedded sleeve (2), closing the upper end port of the embedded sleeve (2), and fixing the connection by means of a fastener (6); Concrete is poured, and sealing concrete is poured into the sinking trough (11), and the sealing concrete is coated on the upper end of the cover plate (4) and the embedded sleeve (2).

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