Raft post-cast strip built-in permanent dewatering tube well construction structure and construction method thereof

Abstract

The application discloses raft post-cast strip built-in permanent dewatering pipe well construction structure and a construction method thereof, comprising a raft, a dewatering well pipe assembly, a water pump, a drain pipe, an openable and closable cover plate and micro-expansion concrete. The dewatering well pipe assembly penetrates a foundation leveling layer, and is at least partially located in a post-cast strip. A pipe penetrating hole is formed in the pipe wall of the dewatering well pipe assembly. The water pump is arranged in the dewatering well pipe assembly. The drain pipe is partially located in the post-cast strip. One end of the drain pipe extends to the inside of the dewatering well pipe assembly through the pipe penetrating hole and is connected to the water pump. The other end of the drain pipe extends out of the post-cast strip. The cover plate is used for closing or opening the well mouth at the top of the dewatering well pipe assembly. The application provides an innovative raft post-cast strip built-in permanent dewatering pipe well construction structure. The device can perform dewatering and pressure relief at any time, effectively avoids the safety hazards such as basement overall floating and raft cracking caused by heavy rain or large rise of underground water level, and thus guarantees the use safety of the structure.

Description

Technical Field

[0001] This application relates to the field of construction technology of dewatering manholes in raft foundation post-cast strips, specifically to a construction structure and construction method for permanent dewatering manholes built into raft foundation post-cast strips. Background Technology

[0002] In the field of construction engineering, dewatering manholes are a widely adopted construction technique for foundation pit dewatering. Typically, after the main building construction has reached the predetermined floor height, the manholes need to be sealed according to the construction plan. However, in special construction environments with high groundwater levels, complex surrounding soil and water conditions, and abundant groundwater resources, especially in coastal areas or areas with dense river networks, the underground structure loses its original dewatering and pressure relief channels after the manhole sealing operation. In such cases, if extreme rainstorms or seasonal heavy rainfall cause a rapid rise in the groundwater level, it may lead to a series of serious safety hazards. Specifically, the underground structure may experience enormous buoyancy, potentially causing the basement to float; simultaneously, the large water pressure difference can cause structural cracks in the raft foundation. These safety hazards will seriously threaten the structural safety and reliability of the building, posing incalculable risks to the quality and safety of the entire project.

[0003] In view of the above, this application is hereby submitted. Summary of the Invention

[0004] To address one of the aforementioned technical problems, this application provides a construction structure and construction method for a permanent dewatering manhole embedded in the post-cast strip of a raft foundation.

[0005] The primary objective of this application is to provide a construction structure for a permanent dewatering manhole embedded in the post-cast strip of a raft foundation, as described in the following technical solution:

[0006] A construction structure for a raft foundation post-cast strip with an embedded permanent dewatering pipe well, comprising:

[0007] A raft slab, located on the foundation leveling layer, encloses and forms a post-cast strip;

[0008] A dewatering well pipe assembly, wherein the dewatering well pipe assembly penetrates the foundation leveling layer, wherein at least part of the dewatering well pipe assembly is located in the post-cast strip, and a through hole is formed in the pipe wall of the dewatering well pipe assembly;

[0009] A water pump, wherein the water pump is disposed within the dewatering well pipe assembly;

[0010] A drainage pipe, wherein the drainage pipe portion is located within the post-cast strip, one end of the drainage pipe extends through the pipe hole into the interior of the dewatering well pipe assembly and is connected to the water pump, and the other end of the drainage pipe extends out of the post-cast strip;

[0011] A cover plate, the cover plate being used to close or open the wellhead at the top of the dewatering well pipe assembly;

[0012] Micro-expansion concrete is used to fill the post-cast strip.

[0013] Optionally, the construction structure for the permanent dewatering manhole built into the post-cast strip of the raft foundation includes waterproof membrane;

[0014] The waterproof membrane partially covers the base leveling layer and partially extends to the dewatering well pipe assembly, covering the gap between the drainage pipe and the through hole.

[0015] Optionally, the construction structure for the permanent dewatering pipe well built into the post-cast strip of the raft slab also includes a waterproof putty layer, which covers the waterproof membrane located on the dewatering pipe assembly and the waterproof membrane located on the foundation leveling layer and close to the dewatering pipe assembly.

[0016] Optionally, the dewatering well pipe assembly includes a well pipe body and a steel sleeve;

[0017] The well casing body is installed through the foundation leveling layer;

[0018] The steel sleeve is fitted onto the well casing body and penetrates the foundation leveling layer;

[0019] The through hole penetrates the walls of the steel sleeve and the well casing body;

[0020] The wellhead is formed at the top of the steel casing.

[0021] Optionally, the steel sleeve includes a cylindrical body and a flange disposed at the top of the cylindrical body;

[0022] The cylindrical body is fitted onto the well casing body;

[0023] An angle iron is provided along the edge of the wing plate, and the well opening is formed between the angle iron and the wing flange;

[0024] The cover plate can be inserted into or removed from the wellhead.

[0025] Optionally, the construction structure for the permanent dewatering well built into the post-cast strip of the raft slab also includes rubber gaskets;

[0026] The angle iron comprises two perpendicular strips;

[0027] One of the strips is welded to the flange, and the other strip is perpendicular to the flange;

[0028] The rubber gasket is attached to the inner surface of the two strips;

[0029] The cover plate is attached to the rubber gasket.

[0030] Optionally, a clearance space is formed between the flange and the raft plate;

[0031] The drainage pipe extends from the clearance space into the post-cast strip.

[0032] Optionally, longitudinal reinforcement bars are provided in the post-cast strip;

[0033] Anchor bars are welded onto the steel sleeve, and the anchor bars are connected to the longitudinal bars in the post-cast strip.

[0034] The primary objective of this application is to provide a construction method for a raft foundation post-cast strip embedded permanent dewatering manhole construction structure, as follows:

[0035] The construction method for the raft foundation post-cast strip embedded permanent dewatering manhole construction structure as described above includes:

[0036] S1. Install a water pump inside the well pipe body of the dewatering well pipe assembly according to the designed water level control line height;

[0037] S2. Fabricate a steel sleeve for the dewatering well pipe assembly. The top of the steel sleeve has a flange, which is a square steel plate. The steel sleeve is fitted onto the well pipe body and extends below the foundation leveling layer.

[0038] S3. Fix the drain pipe so that it passes through the through hole and connects to the water pump. The top of the drain pipe leads to the floor layer and then connects to the fire protection pipe network attached to the wall.

[0039] S4. Weld the waterproof membrane on the foundation leveling layer to the surface of the steel sleeve and turn it up to a certain height so that the waterproof membrane covers the gap between the drainage pipe and the pipe hole. Apply water-stop putty around the joint and weld the exposed part of the steel sleeve to the longitudinal reinforcement in the post-pouring strip to make the connection more solid.

[0040] S5. Pour the raft slab concrete on both sides of the post-pouring strip and reserve the construction space for the cover plate.

[0041] S6. Cut off the well casing body until it is flush with the flange;

[0042] S7. After the specified time is reached, weld angle iron around the flange to form a wellhead, and pour the post-cast strip with a higher grade of micro-expansion concrete.

[0043] S8. Install rubber gaskets on the inside of the angle iron and embed the cover plate into the wellhead.

[0044] By adopting the above technical solution, this application has the following beneficial effects:

[0045] This application proposes an innovative construction structure for a permanent dewatering manhole embedded in the post-cast strip of a raft foundation. By embedding the dewatering manhole within the post-cast strip, it becomes a permanent dewatering and pressure relief device. The manhole opening is equipped with a switchable cover, which remains closed during normal construction to prevent debris from falling into the manhole. In case of extreme weather or abnormal rise in groundwater level, the cover can be opened to activate a pump for drainage. This device allows for dewatering and pressure relief at any time, effectively preventing safety hazards such as overall basement uplift and raft foundation cracking caused by heavy rain or a significant rise in groundwater level, thus ensuring the structural safety. Furthermore, this construction structure and method offer advantages such as simple construction, high efficiency, and low cost, making it suitable for various construction environments with high groundwater levels and abundant groundwater resources around the main structure. Attached Figure Description

[0046] The accompanying drawings, which form part of this application, are used to provide a further understanding of the application. The illustrative embodiments and descriptions of the application are used to explain the application, but do not constitute an undue limitation of the application. Obviously, the drawings described below are merely some embodiments, and those skilled in the art can obtain other drawings based on these drawings without creative effort.

[0047] Figure 1 This is a cross-sectional structural diagram showing the construction structure of the raft slab post-cast strip with built-in permanent dewatering pipe well provided in the embodiment of this application;

[0048] Figure 2 This is a top view of the construction structure of the raft slab post-cast strip with built-in permanent dewatering pipe well provided in the embodiment of this application.

[0049] In the diagram: 1. Well casing body; 2. Foundation leveling layer; 3. Waterproof membrane; 4. Water-stopping putty layer; 5. Raft slab; 6. Post-pouring strip; 7. Cylindrical body; 8. Flange; 9. Angle iron; 10. Rubber gasket; 11. Cover plate; 12. Vent hole; 13. Water pump; 14. Water level control line; 15. Water level monitoring device; 16. Water inlet; 17. Water outlet; 18. Drainage pipe. Detailed Implementation

[0050] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate this application, but are not intended to limit the scope of this application.

[0051] In the description of this application, it should be noted that the terms "upper", "lower", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0052] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances. Example

[0053] like Figures 1 to 2 As shown in the illustration, this application provides a construction structure for a permanent dewatering pipe well embedded in a raft foundation post-cast strip, including a raft foundation 5, a dewatering pipe assembly, a pump 13, a drainage pipe 18, a cover plate 11, and micro-expansion concrete. The raft foundation 5 is located on the foundation leveling layer 2, and the raft foundation 5 encloses and forms a post-cast strip. The dewatering pipe assembly penetrates the foundation leveling layer 2, and at least part of the dewatering pipe assembly is located in the post-cast strip. A through-hole is formed in the pipe wall of the dewatering pipe assembly. The pump 13 is disposed inside the dewatering pipe assembly, and the drainage pipe 18 is partially located in the post-cast strip. One end of the drainage pipe 18 extends through the through-hole into the interior of the dewatering pipe assembly and is connected to the outlet 17 of the pump 13. The other end of the drainage pipe 18 extends out of the post-cast strip. The cover plate 11 is used to close or open the wellhead at the top of the dewatering pipe assembly, and the micro-expansion concrete fills the post-cast strip.

[0054] This application proposes an innovative construction structure for a permanent dewatering manhole embedded in the post-cast strip of a raft foundation. By embedding the dewatering manhole within the post-cast strip 6 of the raft foundation 5, it becomes a permanent dewatering and pressure relief device. A switchable cover 11 is installed at the manhole opening, which remains closed during normal construction to prevent debris from falling into the manhole. It can be opened for inspection and maintenance in case of drainage system problems. This device allows for dewatering and pressure relief at any time, effectively avoiding safety hazards such as overall basement uplift and cracking of the raft foundation 5 caused by heavy rain or a significant rise in groundwater levels, thus ensuring the structural safety. Furthermore, this construction structure and method have advantages such as simple construction, high efficiency, and low cost, making it suitable for various construction environments with high groundwater levels and abundant groundwater resources around the main structure.

[0055] In some possible implementations, the construction structure of the permanent dewatering manhole built into the raft foundation post-cast strip also includes a waterproof membrane 3. The waterproof membrane 3 partially covers the foundation leveling layer 2 and partially extends to the dewatering manhole assembly, covering the gap between the drainage pipe 18 and the through-hole. This arrangement effectively prevents groundwater from entering the post-cast strip 6 through the gap between the drainage pipe 18 and the through-hole, or the gap between the raft foundation 5 and the foundation leveling layer 2, thereby ensuring the structure's waterproof performance.

[0056] In some possible implementations, the construction structure of the permanent dewatering manhole built into the raft foundation post-cast strip also includes a waterproof putty layer 4, which covers the waterproof membrane 3 located on the dewatering manhole assembly and the waterproof membrane 3 located on the foundation leveling layer 2 and close to the dewatering manhole assembly. The waterproof putty layer 4 has good adhesion and sealing properties, and can fill the tiny pores and uneven areas on the surface of the waterproof membrane 3, further enhancing the waterproofing effect.

[0057] Furthermore, both the waterproof membrane 3 and the waterproof putty layer 4 cover the gap between the drainage pipe 18 and the through hole, and bend towards the drainage pipe 18 located outside the dewatering well pipe assembly, covering a section of the drainage pipe 18. This design ensures the waterproof integrity of the connection between the drainage pipe 18 and the through hole, avoiding leakage problems caused by poor sealing at the joint, thereby effectively protecting the post-cast strip 6 and the underground structure from groundwater erosion.

[0058] In some possible implementations, the dewatering well pipe assembly includes a well pipe body 1 and a steel sleeve. The well pipe body 1 penetrates the foundation leveling layer 2, and the steel sleeve is fitted onto the well pipe body 1, also penetrating the foundation leveling layer 2. A through-hole penetrates the walls of both the steel sleeve and the well pipe body 1, with the wellhead formed at the top of the steel sleeve. The steel sleeve not only enhances the structural stability of the well pipe body 1 but also effectively prevents deformation or damage caused by long-term groundwater pressure. Furthermore, the tight fit between the steel sleeve and the foundation leveling layer 2 further improves the overall stability and sealing of the dewatering well pipe assembly.

[0059] In some possible implementations, the steel sleeve includes a cylindrical body 7 and a flange 8 disposed on the top of the cylindrical body 7, the cylindrical body 7 being fitted onto the well casing body 1. The design of the flange 8 not only provides a larger support area for the steel sleeve, allowing it to be more securely mounted on the foundation leveling layer 2, but also facilitates the subsequent installation of the cover plate 11 and the formation of the wellhead. An angle iron 9 is provided along the edge of the flange 8, and the wellhead is formed between the angle iron 9 and the flange 8. This structure ensures the strength of the wellhead while facilitating the insertion and removal of the cover plate 11.

[0060] In some possible implementations, the construction structure for the permanent dewatering manhole built into the raft foundation post-cast strip also includes a rubber gasket 10. The angle iron 9 comprises two perpendicular strips, one welded to the flange 8 and the other perpendicular to the flange 8. The rubber gasket 10 fits against the inner surface of the two strips, providing a good seal when the cover plate 11 is embedded in the manhole. Simultaneously, the rubber gasket 10 also buffers the impact force between the cover plate 11 and the angle iron 9, extending the service life of the device.

[0061] In some possible implementations, a clearance space is formed between the flange 8 and the raft slab 5, through which the drain pipe 18 extends from the post-cast strip. This design avoids direct contact between the drain pipe 18 and the raft slab 5, reduces the squeezing and damage to the drain pipe 18 caused by deformation or movement of the raft slab 5, and ensures unobstructed flow of the drain pipe 18.

[0062] In some possible implementations, longitudinal reinforcement is provided within the post-cast strip, and anchor bars are welded onto the steel sleeve. These anchor bars are connected to the longitudinal reinforcement within the post-cast strip 6. After micro-expansion concrete is poured into the post-cast strip 6, this connection method tightly integrates the dewatering well pipe assembly with the post-cast strip 6 structure, forming a unified whole and enhancing the stability and deformation resistance of the entire structure. When the groundwater level changes or encounters external forces, relative displacement between the dewatering well pipe assembly and the post-cast strip 6 can be effectively prevented, thus ensuring the overall safety and reliability of the structure.

[0063] In some possible implementations, the cover plate 11 is provided with a vent 12, which extends through the cover plate 11. The vent 12 can effectively balance the air pressure inside and outside the dewatering well pipe assembly, preventing the cover plate 11 from being difficult to open or close due to air pressure differences, and also avoiding potential damage to the well pipe structure due to air pressure accumulation. Under normal conditions, the vent 12 remains unobstructed, ensuring smooth airflow exchange during dewatering operations. When encountering extreme weather or when it is necessary to temporarily close the wellhead, the vent 12 can be sealed with a special plug or valve to meet the usage requirements under different working conditions.

[0064] In some possible implementations, the bottom of the pump 13 is equipped with an inlet 16 and a water level monitoring device 15. The inlet 16 is located at the bottom of the pump 13, facilitating the extraction of groundwater from the bottom of the well pipe and ensuring pumping efficiency. The water level monitoring device 15 monitors the water level changes in the well pipe in real time. When the water level rises to a preset safety threshold, an alarm system is automatically triggered to remind construction personnel to take timely countermeasures, such as turning on the pump 13 to drain the water, thereby effectively preventing safety hazards caused by excessively high groundwater levels. In addition, the data recording function of the water level monitoring device 15 can also provide valuable data support for subsequent construction management and maintenance, helping to optimize dewatering plans and improve construction efficiency.

[0065] In some possible implementations, one end of the drainage pipe 18 extending beyond the post-cast strip is connected to the fire protection pipe network, thus achieving effective utilization of drainage resources. During normal construction, if the amount of groundwater extracted from the dewatering well assembly is moderate, it can be directly discharged into the fire protection pipe network, avoiding water waste and supplementing fire-fighting water to a certain extent. Simultaneously, this connection method simplifies the layout of the drainage pipe 18, reducing additional pipe laying costs and construction difficulty. When encountering heavy rain or an abnormal rise in groundwater levels requiring large-scale drainage, the powerful drainage capacity of the fire protection pipe network can quickly remove excess water, ensuring the safety of the construction area. Moreover, through the connection with the fire protection pipe network, the existing monitoring and maintenance system of the fire protection pipe network can be utilized to monitor and manage the drainage situation in real time, further improving the reliability and stability of the drainage system. Example

[0066] like Figures 1 to 2 As shown, this embodiment provides a construction method for the raft foundation post-cast strip embedded permanent dewatering pipe well construction structure as described in Embodiment 1, including:

[0067] S1. Install a water pump 13 inside the well pipe body 1 of the dewatering well pipe assembly according to the designed water level control line 14 height, so that the water inlet 16 of the water pump 13 is flush with or lower than the water level control line 14.

[0068] S2. Make a steel sleeve for the dewatering well pipe assembly. The top of the steel sleeve has a flange 8, which is a square steel plate. The steel sleeve is put on the well pipe body 1 and extends into the foundation leveling layer 2.

[0069] S3. Fix and install the drain pipe 18 so that the drain pipe 18 passes through the pipe hole and is connected to the water pump 13. The top of the drain pipe 18 leads to the floor layer and then connects to the fire protection pipe network attached to the wall.

[0070] S4. Weld the waterproof membrane 3 on the foundation leveling layer 2 to the surface of the steel sleeve and turn it up to a certain height so that the waterproof membrane 3 covers the gap between the drainage pipe 18 and the pipe hole. Apply water-stop putty around the joint and weld the exposed part of the steel sleeve to the longitudinal reinforcement in the post-pouring strip 6 to make the connection more solid.

[0071] S5. Pour concrete on both sides of the raft slab 5 after pouring the post-pouring strip 6, and reserve construction space for the cover plate 11.

[0072] S6. Cut off the well casing body 1 until it is flush with the flange 8;

[0073] S7. After the specified time is reached, weld angle iron 9 around the flange 8 to form a wellhead, and pour the post-cast strip 6 with a higher grade of micro-expansion concrete.

[0074] S8. Install rubber gasket 10 inside angle iron 9 and embed cover plate 11 into wellhead.

[0075] This embodiment provides a construction method for a permanent dewatering manhole embedded in the post-cast strip of a raft foundation. This method effectively seals the water supply while simultaneously partially enclosing the dewatering manhole, raising its elevation, preserving its function, and thus effectively permanentizing it. This method is convenient to construct and features automation, high efficiency, low cost, energy saving, environmental friendliness, and wide applicability.

[0076] The preferred embodiments disclosed above are merely illustrative of this application. The preferred embodiments do not exhaustively describe modifications and variations. These embodiments are selected and specifically described in this specification to better explain the principles and practical applications of this application, thereby enabling those skilled in the art to better understand and utilize this application. This application is limited only by the claims and their full scope and equivalents.

Claims

1. A construction structure for a permanent dewatering pipe well embedded in the post-cast strip of a raft foundation, characterized in that, include: A raft slab, located on the foundation leveling layer, encloses and forms a post-cast strip; A dewatering well pipe assembly, wherein the dewatering well pipe assembly penetrates the foundation leveling layer, wherein at least part of the dewatering well pipe assembly is located in the post-cast strip, and a through hole is formed in the pipe wall of the dewatering well pipe assembly; A water pump, wherein the water pump is disposed within the dewatering well pipe assembly; A drainage pipe, wherein the drainage pipe portion is located within the post-cast strip, one end of the drainage pipe extends through the pipe hole into the interior of the dewatering well pipe assembly and is connected to the water pump, and the other end of the drainage pipe extends out of the post-cast strip; A switchable cover plate for closing or opening the wellhead at the top of the dewatering well pipe assembly; Micro-expansion concrete is used to fill the post-cast strip.

2. The construction structure for the embedded permanent dewatering pipe well in the post-cast strip of the raft foundation according to claim 1, characterized in that, Including waterproof membranes; The waterproof membrane partially covers the base leveling layer and partially extends to the dewatering well pipe assembly, covering the gap between the drainage pipe and the through hole.

3. The construction structure for the embedded permanent dewatering pipe well in the post-cast strip of the raft foundation according to claim 2, characterized in that, It also includes a waterproofing putty layer that covers the waterproof membrane on the dewatering well pipe assembly and the waterproof membrane on the foundation leveling layer and close to the dewatering well pipe assembly.

4. The construction structure for the embedded permanent dewatering pipe well in the post-cast strip of the raft foundation according to claim 1, characterized in that, The dewatering well pipe assembly includes a well pipe body and a steel sleeve; The well casing body is installed through the foundation leveling layer; The steel sleeve is fitted onto the well casing body and penetrates the foundation leveling layer; The through hole penetrates the walls of the steel sleeve and the well casing body; The wellhead is formed at the top of the steel casing.

5. The construction structure for the embedded permanent dewatering pipe well in the post-cast strip of the raft foundation according to claim 4, characterized in that, The steel sleeve includes a cylindrical body and a flange disposed at the top of the cylindrical body; The cylindrical body is fitted onto the well casing body; An angle iron is provided along the edge of the wing plate, and the well opening is formed between the angle iron and the wing flange; The cover plate can be inserted into or removed from the wellhead.

6. The construction structure for the embedded permanent dewatering pipe well in the post-cast strip of the raft foundation according to claim 5, characterized in that, Including rubber gaskets; The angle iron comprises two perpendicular strips; One of the strips is welded to the flange, and the other strip is perpendicular to the flange; The rubber gasket is attached to the inner surface of the two strips; The cover plate is attached to the rubber gasket.

7. The construction structure for the embedded permanent dewatering pipe well in the post-cast strip of the raft foundation according to claim 6, characterized in that, A clearance space is formed between the flange and the raft plate; The drainage pipe extends from the clearance space into the post-cast strip.

8. The construction structure for the embedded permanent dewatering pipe well in the post-cast strip of the raft foundation according to claim 4, characterized in that, Longitudinal reinforcement bars are provided in the post-cast strip; Anchor bars are welded onto the steel sleeve, and the anchor bars are connected to the longitudinal bars in the post-cast strip.

9. The construction method of the permanent dewatering pipe well embedded in the post-cast strip of the raft foundation as described in any one of claims 1-8, characterized in that, include: S1. Install a water pump inside the well pipe body of the dewatering well pipe assembly according to the designed water level control line height; S2. Fabricate a steel sleeve for the dewatering well pipe assembly. The top of the steel sleeve has a flange, which is a square steel plate. The steel sleeve is fitted onto the well pipe body and extends below the foundation leveling layer. S3. Fix the drain pipe so that it passes through the through hole and connects to the water pump. The top of the drain pipe leads to the floor layer and then connects to the fire protection pipe network attached to the wall. S4. Weld the waterproof membrane on the foundation leveling layer to the surface of the steel sleeve and turn it up to a certain height so that the waterproof membrane covers the gap between the drainage pipe and the pipe hole. Apply water-stop putty around the joint and weld the exposed part of the steel sleeve to the longitudinal reinforcement in the post-pouring strip to make the connection more solid. S5. Pour the raft slab concrete on both sides of the post-pouring strip and reserve the construction space for the cover plate. S6. Cut off the well casing body until it is flush with the flange; S7. After the specified time is reached, weld angle iron around the flange to form a wellhead, and pour the post-cast strip with a higher grade of micro-expansion concrete. S8. Install rubber gaskets on the inside of the angle iron and embed the cover plate into the wellhead.

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