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

Abstract

The invention discloses a raft post-cast strip built-in permanent downcast well construction structure and a construction method thereof. The raft post-cast strip built-in permanent downcast well construction structure comprises a raft, a downcast well pipe assembly, a water suction pump, a drainage pipe, a cover plate and micro-expansive concrete. The dewatering well pipe assembly penetrates through the foundation leveling layer, at least part of the dewatering well pipe assembly is located on the rear adhesive tape, and 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 drainage pipe is partially located in the post-cast strip, one end of the drainage pipe penetrates through the pipe penetrating hole, extends into the dewatering well pipe assembly and is connected to the water pump, and the other end of the drainage pipe extends out of the rear adhesive tape. The cover plate is used for closing or opening a well opening in the top of the dewatering well pipe assembly. According to the innovative raft post-cast strip built-in permanent precipitation tube well construction structure, precipitation and pressure relief can be conducted at any time through the device, the potential safety hazards such as overall basement floating and raft cracking caused by rainstorm or great rising of the underground water level are effectively avoided, and therefore the use safety of the structure is guaranteed.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of raft post-cast strip dewatering pipe well construction, and particularly relates to a built-in permanent dewatering pipe well construction structure for a raft post-cast strip and a construction method thereof. BACKGROUND

[0002] In the field of building engineering practice, as a widely used construction technology for foundation pit dewatering, the dewatering pipe well is usually closed according to the construction scheme after the main building construction reaches the predetermined floor height. However, in the special construction environment where the underground water level is relatively high, the water and soil environment around the main structure is complex, and the underground water resources are extremely rich, especially in coastal areas or areas with dense river networks. When the pipe well is closed, the underground structure will lose the original dewatering and pressure relief channel. In this case, if extreme rain or seasonal heavy rain causes the underground water level to rise sharply, a series of serious safety hazards may be caused. Specifically, the underground structure as a whole may be subjected to a large floating force, which may cause the whole basement to float up; meanwhile, the large water pressure difference may also cause structural cracks in the raft foundation, which will seriously threaten the structural safety and use reliability of the building and bring immeasurable risks to the quality and safety of the entire project.

[0003] Therefore, the application is provided. SUMMARY

[0004] To solve one of the above technical problems, the application provides a built-in permanent dewatering pipe well construction structure for a raft post-cast strip and a construction method thereof.

[0005] The first purpose of the application is to provide a built-in permanent dewatering pipe well construction structure for a raft post-cast strip, and the technical scheme is as follows: A built-in permanent dewatering pipe well construction structure for a raft post-cast strip comprises: a raft, which is located on a foundation leveling layer and encloses a post-cast strip; a dewatering well pipe assembly, which penetrates the foundation leveling layer, is at least partially located in the post-cast strip, and has a pipe wall with a pipe penetrating hole; a water pumping pump, which is arranged in the dewatering well pipe assembly; a drainage pipe, which is partially located in the post-cast strip, extends to the inside of the dewatering well pipe assembly through the pipe penetrating hole at one end, and is connected to the water pumping pump at the other end; a cover plate, which is used to close or open the well mouth at the top of the dewatering well pipe assembly; micro-expansion concrete, which is filled in the post-cast strip.

[0006] Optionally, the raft post-cast strip built-in permanent dewatering pipe well construction structure comprises a waterproof coiled material; Part of the waterproof coiled material is covered on the foundation leveling layer, and part of the waterproof coiled material extends to the dewatering well pipe assembly and covers the gap between the drain pipe and the pipe hole.

[0007] Optionally, the raft post-cast strip built-in permanent dewatering pipe well construction structure further comprises a waterproof putty layer, which covers the waterproof coiled material on the dewatering well pipe assembly and the waterproof coiled material on the foundation leveling layer close to the dewatering well pipe assembly.

[0008] Optionally, the dewatering well pipe assembly comprises a well pipe body and a steel sleeve; The well pipe body is arranged through the foundation leveling layer; The steel sleeve is sleeved on the well pipe body, and the steel sleeve penetrates the foundation leveling layer; The pipe hole penetrates the steel sleeve and the pipe wall of the well pipe body; The top of the steel sleeve forms the well mouth.

[0009] Optionally, the steel sleeve comprises a cylindrical body and a flange arranged at the top of the cylindrical body; The cylindrical body is sleeved on the well pipe body; The edge of the flange is provided with an angle iron, and the angle iron and the flange form the well mouth; The cover plate can be embedded in or taken out of the well mouth.

[0010] Optionally, the raft post-cast strip built-in permanent dewatering pipe well construction structure further comprises a rubber gasket; The angle iron comprises two strips perpendicular to each other; One of the strips is welded on 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.

[0011] Optionally, an avoidance space is formed between the flange and the raft; The drain pipe extends out of the post-cast strip from the avoidance space.

[0012] Optionally, longitudinal reinforcement is arranged in the post-cast strip; An anchor bar is welded on the steel sleeve, and the anchor bar is connected with the longitudinal reinforcement in the post-cast strip.

[0013] The first object of the present application is to provide a construction method of a raft post-cast strip built-in permanent dewatering pipe well construction structure, as follows: The construction method of the raft post-cast strip built-in permanent dewatering pipe well construction structure as described above comprises: 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.

[0014] By adopting the above technical solution, this application has the following beneficial effects: 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

[0015] 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.

[0016] Fig. 1A cross-sectional structural schematic diagram of a raft post-cast strip built-in permanent dewatering tube well construction structure provided by the embodiment of the present application is shown. Fig. 2 A top view structural schematic diagram of a raft post-cast strip built-in permanent dewatering tube well construction structure provided by the embodiment of the present application is shown.

[0017] In the figure: well pipe body 1, foundation leveling layer 2, waterproof roll material 3, water stop putty layer 4, raft 5, post-cast strip 6, cylindrical body 7, flange 8, angle iron 9, rubber gasket 10, cover plate 11, exhaust hole 12, water pumping pump 13, water level control line 14, water level monitoring device 15, water inlet 16, water outlet 17, drain pipe 18. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme in the embodiments will be clearly and completely described below in combination with the drawings of the embodiments of the present application. The following embodiments are used to illustrate the present application, but not to limit the scope of the present application.

[0019] In the description of the present application, it should be noted that the orientation or position relationship indicated by the terms “upper”, “lower”, “inner”, “outer” and the like is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0020] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms “mounting”, “connection” should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0021] Embodiment one As Figs. 1-2As shown, the raft post-cast strip built-in permanent dewatering pipe well construction structure provided by the embodiment of the present application comprises a raft 5, a dewatering well pipe assembly, a water pumping pump 13, a drain pipe 18, a cover plate 11 and micro-expansion concrete. The raft 5 is located on a foundation leveling layer 2, and the raft 5 forms a post-cast strip. The dewatering well pipe assembly penetrates the foundation leveling layer 2, and the dewatering well pipe assembly is at least partially located in the post-cast strip, and a pipe penetrating hole is formed in the pipe wall of the dewatering well pipe assembly. The water pumping pump 13 is arranged in the dewatering well pipe assembly, the drain pipe 18 is partially located in the post-cast strip 6, one end of the drain pipe 18 extends to the inside of the dewatering well pipe assembly through the pipe penetrating hole, and is connected to the water outlet 17 of the water pumping pump 13, and the other end of the drain pipe 18 extends out of the post-cast strip. The cover plate 11 is used to close or open the well mouth at the top of the dewatering well pipe assembly, and the micro-expansion concrete is filled in the post-cast strip.

[0022] The present application provides an innovative raft post-cast strip built-in permanent dewatering pipe well construction structure, which embeds the dewatering pipe well in the raft 5 post-cast strip 6 to make it a permanent dewatering and pressure relief device. A switchable cover plate 11 is arranged at the well mouth of the dewatering pipe well, which can be kept closed during the normal construction stage to prevent debris from falling into the well, and can be opened for maintenance when the drainage system fails. In this way, the device can always be used for dewatering and pressure relief, effectively avoiding the safety hazards of basement overall floating and raft 5 cracking caused by heavy rain or large rise of underground water level, thereby ensuring the safety of the structure. At the same time, the construction structure and method also have the advantages of simple construction, high efficiency and low cost, and are suitable for various construction environments with high underground water level, surrounding main structure and abundant underground water resources.

[0023] In some possible embodiments, the raft post-cast strip built-in permanent dewatering pipe well construction structure further comprises a waterproof coiled material 3, which is partially covered on the foundation leveling layer 2 and partially extends to the dewatering well pipe assembly to cover the gap between the drain pipe 18 and the pipe penetrating hole. Through such arrangement, the underground water can be effectively prevented from entering one side of the post-cast strip 6 through the gap between the drain pipe 18 and the pipe penetrating hole or the gap between the raft 5 and the foundation leveling layer 2, thereby ensuring the waterproof performance of the structure.

[0024] In some possible embodiments, the raft post-cast strip built-in permanent dewatering pipe well construction structure further comprises a waterproof putty layer 4, which covers the waterproof coiled material 3 located on the dewatering well pipe assembly and the waterproof coiled material 3 located on the foundation leveling layer 2 and close to the dewatering well pipe assembly. The waterproof putty layer 4 has good adhesion and sealing properties, and can fill the small pores and uneven places on the surface of the waterproof coiled material 3, further enhancing the waterproof effect.

[0025] 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.

[0026] 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.

[0027] 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.

[0028] 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.

[0029] In some possible implementations, a clearance space is formed between the flange 8 and the raft plate 5, through which the drain pipe 18 extends from the rear adhesive tape. This design avoids direct contact between the drain pipe 18 and the raft plate 5, reduces the squeezing and damage to the drain pipe 18 caused by deformation or movement of the raft plate 5, and ensures unobstructed flow of the drain pipe 18.

[0030] 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.

[0031] 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.

[0032] 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.

[0033] In some possible implementations, one end of the extended drain pipe 18 is connected to the fire protection network, thus connecting the drain pipe 18 to the fire protection network and 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 network, avoiding water waste and supplementing fire-fighting water to a certain extent. Simultaneously, this connection method simplifies the layout of the drain pipe 18, reducing additional pipeline 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 network can quickly remove excess water, ensuring the safety of the construction area. Moreover, through the connection with the fire protection network, the existing monitoring and maintenance system of the fire protection network can be utilized to monitor and manage the drainage situation in real time, further improving the reliability and stability of the drainage system.

[0034] Example 2 like Figs. 1-2 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: 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. 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. 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. 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. 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. S6. Cut off the well casing body 1 until it is flush with the flange 8; 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. S8. Install rubber gasket 10 inside angle iron 9 and embed cover plate 11 into wellhead.

[0035] 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.

[0036] 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 raft construction structure with built-in permanent dewatering tube well in post-cast strip, characterized in that, The raft is located on the foundation leveling layer, and the raft encloses the post-pouring belt. The dewatering well pipe assembly penetrates the foundation leveling layer, and is at least partially located in the post-pouring belt. The water pump is arranged in the dewatering well pipe assembly. The drain pipe is partially located in the post-pouring belt, and 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 cover plate is used to close or open the well mouth at the top of the dewatering well pipe assembly. The micro-expansion concrete is filled in the post-pouring belt. The waterproof roll is partially covered on the foundation leveling layer and partially extends to the dewatering well pipe assembly to cover the gap between the drain pipe and the pipe penetrating hole.

2. The raft construction structure with embedded permanent dewatering tube well after-pouring strip according to claim 1, characterized in that, The waterproof roll is partially covered on the foundation leveling layer and partially extends to the dewatering well pipe assembly to cover the gap between the drain pipe and the pipe penetrating hole. The dewatering well pipe assembly comprises a well pipe body and a steel sleeve.

3. The raft construction structure with embedded permanent dewatering tube well after-pouring strip according to claim 2, characterized in that, The well pipe body penetrates the foundation leveling layer.

4. The raft construction structure with embedded permanent dewatering tube well after-pouring strip according to claim 1, characterized in that, The steel sleeve is sleeved on the well pipe body, and the steel sleeve penetrates the foundation leveling layer. The pipe penetrating hole penetrates the steel sleeve and the pipe wall of the well pipe body. The top of the steel sleeve forms the well mouth. The steel sleeve comprises a cylindrical body and a flange arranged at the top of the cylindrical body. The cylindrical body is sleeved on the well pipe body.

5. The raft construction structure with embedded permanent dewatering tube well after-pouring strip according to claim 4, characterized in that, The edge of the flange is provided with an angle iron, and the angle iron and the flange form the well mouth. The cover plate can be embedded in or taken out of the well mouth. The rubber gasket is arranged on the inner surface of the two strips. The angle iron comprises two strips perpendicular to each other.

6. The raft construction structure with embedded permanent dewatering tube well after-pouring strip according to claim 5, characterized in that, One of the strips is welded on 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. An avoiding space is formed between the flange and the raft. The drain pipe extends out of the post-pouring belt from the avoiding space.

7. The raft construction structure with embedded permanent dewatering tube well after-pouring strip according to claim 6, characterized in that, Longitudinal reinforcement is arranged in the post-pouring belt. An anchor bar is welded on the steel sleeve, and the anchor bar is connected with the longitudinal reinforcement in the post-pouring belt.

8. The raft construction structure with built-in permanent dewatering tube well according to claim 4, wherein, The method comprises the following steps: S1, installing a water pump in the well pipe body of the dewatering well pipe assembly according to the designed water level control line height; 9. The construction method of raft construction structure with built-in permanent dewatering pipe well in post-cast strip according to any one of claims 1-8, characterized in that, S2, manufacturing a steel sleeve of the dewatering well pipe assembly, the top of the steel sleeve is provided with a flange, the flange is a square steel plate, the steel sleeve is sleeved on the well pipe body and extends below the foundation leveling layer; S3, fixing and installing a drain pipe, so that the drain pipe is connected to the water pump through the pipe penetrating hole, and the top of the drain pipe is connected to the wall-attached fire pipe network after passing through the terrace layer; S4, hot welding the waterproof roll on the foundation leveling layer to the surface of the steel sleeve and turning up by a certain height, so that the waterproof roll covers the gap between the drain pipe and the pipe penetrating hole, brushing waterproof putty around the joint, welding anchor bars on the exposed part of the steel sleeve and connecting the anchor bars with the longitudinal reinforcement in the post-pouring belt to make the connection more firm; S5, pouring raft concrete on both sides of the post-pouring belt and reserving construction space for the cover plate; S6, cutting off the well pipe body to be flush with the flange. ​ ​ S7, after reaching the specified time, a circle of welding angle iron around the flange, forming the wellhead, using high-grade micro-expansion concrete pouring post-pouring belt; S8, rubber gasket installed inside the angle iron, cover embedded in the wellhead.

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