A method for dewatering existing basement floor slabs in high-water-head areas

Abstract

This invention relates to a method for dewatering existing basement slabs in high-water-head areas. The method involves pre-drilling holes in the existing slab and installing opening and closing devices to ensure the slab's watertightness and strengthen the connection between the dewatering equipment and the slab, preventing water pressure from breaching weak points in the holes. Simultaneously, two drilling operations are employed during the drilling process to prevent groundwater from escalating and causing hazards after the dewatering channels are opened in high-water-head areas. By installing pressure monitoring pipes, the groundwater level can be monitored in real time during dewatering, allowing for continuous monitoring of the groundwater head and preventing unforeseen events. This method provides strong water-stopping effects after drilling holes in the existing basement slabs in high-water-head areas and facilitates subsequent sealing. This method effectively reduces the groundwater head beneath existing basement slabs in high-water-head areas, thus preparing for the connection between new and old buildings and possessing high engineering practical value.

Description

Technical Field

[0001] This invention relates to a method for dewatering existing basement floor slabs in high-water-head areas, belonging to the field of basement dewatering construction technology. Background Technology

[0002] With the rapid growth of the national economy, land is becoming increasingly scarce, and the development and utilization of underground space is becoming more and more common and valued. At present, a large number of buildings in my country are equipped with basements as garages, storage rooms, etc., and even underground housing and underground supermarkets are also common. At the same time, the renovation of existing underground structures, the overlapping construction of new and old structures, and the connection between new and old underground structures are becoming increasingly common.

[0003] Because the exterior walls and floor slab of a basement are located below ground level, they are frequently subject to erosion by groundwater. Therefore, a major and unavoidable challenge in the renovation of existing underground structures, the overlapping construction of new and old structures, and the connection between new and old underground structures is the potential for groundwater runoff during the construction of the structural floor slab in areas with high groundwater heads. Groundwater runoff not only hinders construction progress but also seriously endangers the safety of the surrounding environment. To ensure the safety of the basement and guarantee a dry and healthy environment, dewatering and drainage of the basement has become a crucial aspect of the construction process.

[0004] Currently, conventional dewatering measures for basements, such as manholes and lightweight wellpoints, have already been sealed when the structure is handed over for use. Therefore, they cannot provide good dewatering effects during the renovation of existing underground structures, the overlapping construction of new and old structures, and the connection between new and old underground structures.

[0005] Therefore, it is necessary to invent a dewatering construction method for existing basement slabs in high-water-head areas to solve the above problems. Summary of the Invention

[0006] The purpose of this invention is to provide a method for dewatering existing basement slabs in high-head areas that can safely and conveniently reduce the groundwater level beneath the existing basement floor slab.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] A method for dewatering existing basement slabs in high-water-head areas includes the following steps:

[0009] S1. Prepare an opening and closing device with an internal ball valve. The opening and closing device includes a device body and a base disposed on the device body and coaxially disposed with the device body. The diameter of the base is larger than the diameter of the device body. The opening and closing device also includes a flexible sealing element wrapped around the outer periphery of the base and a pressure measuring tube disposed on the side of the opening and closing device, communicating with the opening and closing device and extending along the inner wall of the opening and closing device. A small ball valve is provided at the connection between the pressure measuring tube and the opening and closing device to control the connection and blockage of the pressure measuring tube.

[0010] S2. Remove the basement floor slab pavement layer down to the floor slab structural layer, and cut mounting holes on the floor slab structural layer. The mounting holes include a base mounting hole with a diameter larger than that of the base and a reserved hole located at the lower end of the base mounting hole. The base mounting hole and the reserved hole are coaxially arranged, and the depth of the base mounting hole is greater than the thickness of the base.

[0011] S3. The opening and closing device is hammered into the mounting hole, the base is inserted into the mounting hole of the base and embedded in the concrete of the base plate, and the flexible sealing element is tightly fitted to the inner wall of the mounting hole.

[0012] S4. Open the ball valve, insert the No. 1 cutting pipe from the upper end of the opening and closing device, cut out the No. 1 rainwater channel without penetrating the bottom plate, pull out the No. 1 cutting pipe, insert the No. 2 cutting pipe with a diameter smaller than the No. 1 cutting pipe, make a hole at the bottom of the rainwater channel, penetrate the bottom plate and extend downward to obtain the No. 2 rainwater channel set below the No. 1 rainwater channel and coaxially arranged with the No. 1 rainwater channel, pull out the No. 2 cutting pipe, and quickly close the ball valve;

[0013] S5. A sleeve is installed at the upper end of the opening and closing device, and the height of the sleeve is greater than the groundwater level.

[0014] S6. Open the ball valve and the small ball valve, observe the groundwater level through the pressure measuring tube, and after the groundwater rises to a stable level, place a pumping pipe connected to a vacuum pump inside the casing to pump water. The bottom end of the pumping pipe extends to the bottom of the second precipitation channel, and several small holes are opened around the lower end of the pumping pipe.

[0015] Furthermore, the depth of the No. 1 precipitation channel is half the thickness of the base plate.

[0016] Furthermore, the depth of the second precipitation channel is 2.5m.

[0017] Furthermore, the base has a diameter of 500mm, the mounting hole diameter is 520mm, and the main body diameter is 300mm.

[0018] Furthermore, the flexible seal is a tallow packing.

[0019] Furthermore, the inner diameter of the ball valve is 200mm, the diameter a of the first cutting pipe is 150mm≤a<200mm, and the diameter of the second cutting pipe is 80mm.

[0020] Furthermore, the height of the casing is 1.2 to 1.5 times the groundwater level.

[0021] Furthermore, the pressure measuring tube extends to the bottom of the second precipitation channel.

[0022] Furthermore, a rubber water-stop ring is provided between the sleeve and the opening and closing device.

[0023] Furthermore, the outer periphery of the water pump pipe is wrapped with gauze.

[0024] The beneficial effects of this invention are as follows:

[0025] This invention ensures the watertightness of the existing basement slab by pre-drilling holes and installing opening and closing devices, strengthening the connection between the dewatering equipment and the base slab and preventing water pressure from breaching weak points in the holes. Simultaneously, the dewatering channel is created through double drilling to prevent groundwater in high-head areas from causing hazards after the channel is opened. By installing pressure monitoring pipes, the groundwater level can be monitored in real time during dewatering, allowing for continuous monitoring of the groundwater head and preventing emergencies. This invention provides a strong watertight effect after drilling holes in the existing basement slab in high-head areas, and is easy to seal later. This method can reduce the groundwater head under the existing basement slab in high-head areas, thus preparing for the connection between new and old buildings and possessing high engineering practical value.

[0026] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, the preferred embodiments of the present invention are described in detail below. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of a dewatering construction method for existing basement slabs in high-water-head areas, as shown in an embodiment of the present invention.

[0029] in:

[0030] 1. Base plate; 2. Opening and closing device; 21. Main body of the device; 22. Base; 23. Flexible sealing element; 24. Ball valve; 25. Pressure measuring tube; 3. Sleeve; 4. Pumping pipe; 41. Vacuum pump; 42. Small hole; 43. Gauze. Detailed Implementation

[0031] The specific embodiments of the present invention will be described in further detail below with reference to the examples. These examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0032] Please see Figure 1 The present invention discloses a preferred embodiment of a dewatering construction method for existing basement slabs in high-water-head areas, which is applicable to the renovation of existing underground structures, the overlapping construction of new and old structures, and the connection of new and old underground structures, and has a good dewatering effect.

[0033] A method for dewatering existing basement slabs in high-water-head areas includes the following steps:

[0034] S1. Prepare an opening and closing device 2 containing a ball valve 24. The opening and closing device 2 includes a device body 21 and a base 22 disposed on the device body 21 and coaxially disposed with the device body 21. The diameter of the base 22 is larger than the diameter of the device body 21. The opening and closing device 2 also includes a flexible sealing element 23 wrapped around the outer periphery of the base 22 and a pressure measuring tube 25 disposed on the side of the opening and closing device 2, communicating with the opening and closing device 2 and extending along the inner wall of the opening and closing device 2. A small ball valve is provided at the connection between the pressure measuring tube 25 and the opening and closing device 2 to control the connection and blockage of the pressure measuring tube 25.

[0035] S2. Remove the basement floor slab pavement down to the structural layer, and cut installation holes in the structural layer. The installation holes include a base mounting hole with a diameter larger than that of the base 22, and a pre-drilled hole at the lower end of the base mounting hole. As described above, the diameter of the base 22 is larger than the diameter of the device body 21, so that when the opening / closing device 2 is installed into the mounting hole, it forms a stepped interlocking structure with the base slab 1, thereby strengthening the connection between the opening / closing device 1 and the base slab 1 and preventing water pressure from breaching the weak point of the opening and causing a dangerous situation. Specifically, the base 22 has a diameter of 500mm, the device body 21 has a diameter of 300mm, and the ball valve 24 has a diameter of 200mm, enabling efficient dewatering.

[0036] The diameter of the reserved hole is larger than the diameter of the main body 21 but smaller than the diameter of the base 22. The mounting hole is coaxial with the reserved hole, and the depth of the mounting hole in the base is greater than the thickness of the base 22. Specifically, the diameter of the mounting hole in the base is 520mm, which facilitates the installation of the opening and closing device 2.

[0037] S3. The opening / closing device 2 is hammered into the mounting hole, and the base 22 is inserted into the mounting hole, embedding itself into the concrete of the base plate 1. The flexible sealing element 23 fits tightly against the inner wall of the mounting hole, ensuring a tight connection between the opening / closing device 2 and the mounting hole, preventing water leakage. It also acts as a buffer during the hammering process. In this embodiment, the flexible sealing element 23 is grease packing, which is flexible, elastic, and anti-aging, providing a good sealing effect. In other embodiments, the flexible sealing element 23 can also be grease packing, cotton packing, etc., and is not limited here.

[0038] S4. Open ball valve 24, insert cutting pipe No. 1 from the top of opening / closing device 2, and cut out a first-level drainage channel that does not penetrate the base plate 1. Pull out cutting pipe No. 1, insert cutting pipe No. 2 with a diameter smaller than cutting pipe No. 1, make a hole at the bottom of the drainage channel, penetrate the base plate 1 and extend downward to obtain a second-level drainage channel set below the first-level drainage channel and coaxially arranged with the first-level drainage channel. Pull out cutting pipe No. 2, and quickly close ball valve 24 to reduce the amount of groundwater flowing out. Specifically, in this embodiment, the diameter a of cutting pipe No. 1 is 150mm ≤ a < 200mm, the diameter of cutting pipe No. 2 is 80mm, the depth of drainage channel No. 1 is half the thickness of base plate 1, and the depth of drainage channel No. 2 is 2.5m. The smaller diameter of the No. 2 precipitation channel can effectively prevent the large amount of groundwater from surging upwards and becoming uncontrollable due to excessively large openings. The larger diameter of the No. 1 precipitation channel can accommodate some of the groundwater surging out from the No. 2 precipitation channel, playing a buffering role and preventing groundwater from surging out of the opening and closing device 2 before the ball valve 24 is closed.

[0039] S5. A sleeve 3 is installed at the upper end of the opening and closing device 2. The height of the sleeve 3 is greater than the groundwater level to prevent groundwater from overflowing the sleeve 3 after it flows out. In this embodiment, the height of the sleeve 3 is 1.2 to 1.5 times the groundwater level. This prevents groundwater from overflowing the sleeve 3 while also preventing the sleeve 3 from being too high and causing its upper end to hit the basement ceiling.

[0040] A rubber sealing ring is also provided at the connection between the sleeve 3 and the opening and closing device 2, and four bolts are used to press and fix the connection between the sleeve 3 and the opening and closing device 2 to prevent groundwater in the conduit from leaking out from the joint.

[0041] S6. Open ball valve 24 to extend the end of pressure measuring pipe 25 to the bottom of the No. 2 dewatering channel; open small ball valve and observe the groundwater level through pressure measuring pipe 25. After the groundwater rises and stabilizes, place a pumping pipe 4 connected to vacuum pump 41 inside casing 3 to pump water, with the bottom end of pumping pipe 4 extending to the bottom of the installation hole of opening and closing device 2. As described above, the depth of the No. 2 dewatering channel is 2.5m. With the pumping pipe 4 and pressure measuring pipe 25 combined, once the groundwater level drops to a depth of 2 meters below the bottom of the base slab 1, the next step of excavating the base slab 1 for retaining structure can be carried out.

[0042] Furthermore, in this embodiment, several small holes 42 are opened on the pipe wall within 0.5m of the lower end of the pumping pipe 4 to facilitate the rapid entry and discharge of groundwater into the pumping pipe 4 under the action of the vacuum pump 41. The pipe wall above 0.5m of the lower end of the pumping pipe 4 has no small holes 42 to ensure that the vacuum environment inside the pumping pipe 4 is not disrupted, thus maintaining pumping stability. The outer periphery of the pumping pipe 4 is wrapped with gauze 43 to prevent sediment from entering the pumping pipe 4 and damaging the vacuum pump 41.

[0043] In summary, this invention ensures the watertightness of the existing base slab by pre-drilling holes and installing opening and closing devices, strengthening the connection between the dewatering equipment and the base slab and preventing water pressure from breaching weak points in the holes. Simultaneously, the use of double drilling during the creation of the dewatering channel prevents potential hazards caused by groundwater in high-water-head areas after the channel is opened. By installing pressure monitoring pipes, the groundwater level can be monitored in real time during dewatering, allowing for continuous monitoring of the groundwater head and preventing emergencies. This invention provides a strong watertight effect after drilling holes in the existing basement base slab in high-water-head areas, and facilitates subsequent sealing. This method effectively reduces the groundwater head under the existing basement base slab in high-water-head areas, thus preparing for the connection between new and old buildings and possessing high engineering practical value.

[0044] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0045] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A method for dewatering existing basement floor slabs in high-water-head areas, characterized in that, Includes the following steps: S1. Prepare an opening and closing device with an internal ball valve. The opening and closing device includes a device body and a base disposed on the device body and coaxially disposed with the device body. The diameter of the base is larger than the diameter of the device body. The opening and closing device also includes a flexible sealing element wrapped around the outer periphery of the base and a pressure measuring tube disposed on the side of the opening and closing device, communicating with the opening and closing device and extending along the inner wall of the opening and closing device. A small ball valve is provided at the connection between the pressure measuring tube and the opening and closing device to control the connection and blockage of the pressure measuring tube. S2. Remove the basement floor slab pavement layer down to the floor slab structural layer, and cut mounting holes on the floor slab structural layer. The mounting holes include a base mounting hole with a diameter larger than that of the base and a reserved hole located at the lower end of the base mounting hole. The base mounting hole and the reserved hole are coaxially arranged, and the depth of the base mounting hole is greater than the thickness of the base. S3. The opening and closing device is hammered into the mounting hole, the base is inserted into the mounting hole of the base and embedded in the concrete of the base plate, and the flexible sealing element is tightly fitted to the inner wall of the mounting hole. S4. Open the ball valve, insert the No. 1 cutting pipe from the upper end of the opening and closing device, cut out the No. 1 rainwater channel without penetrating the bottom plate, pull out the No. 1 cutting pipe, insert the No. 2 cutting pipe with a diameter smaller than the No. 1 cutting pipe, make a hole at the bottom of the rainwater channel, penetrate the bottom plate and extend downward to obtain the No. 2 rainwater channel set below the No. 1 rainwater channel and coaxially arranged with the No. 1 rainwater channel, pull out the No. 2 cutting pipe, and quickly close the ball valve; S5. A sleeve is installed at the upper end of the opening and closing device, and the height of the sleeve is greater than the groundwater level. S6. Open the ball valve and the small ball valve, observe the groundwater level through the pressure measuring tube, and after the groundwater rises to a stable level, place a pumping pipe connected to a vacuum pump inside the casing to pump water. The bottom end of the pumping pipe extends to the bottom of the second precipitation channel, and several small holes are opened around the lower end of the pumping pipe.

2. The method for dewatering existing basement slabs in high-water-head areas as described in claim 1, characterized in that, The depth of the No. 1 precipitation channel is half the thickness of the base plate.

3. The method for dewatering existing basement floor slabs in high-water-head areas as described in claim 1, characterized in that, The depth of the second precipitation channel is 2.5m.

4. The method for dewatering existing basement slabs in high-water-head areas as described in claim 1, characterized in that, The base has a diameter of 500mm, the mounting hole diameter is 520mm, and the main body diameter is 300mm.

5. The method for dewatering existing basement slabs in high-water-head areas as described in claim 1, characterized in that, The flexible seal is a tallow packing.

6. The method for dewatering existing basement slabs in high-water-head areas as described in claim 1, characterized in that, The inner diameter of the ball valve is 200mm, the diameter a of the first cutting pipe is 150mm≤a<200mm, and the diameter of the second cutting pipe is 80mm.

7. The method for dewatering existing basement slabs in high-water-head areas as described in claim 1, characterized in that, The height of the casing is 1.2 to 1.5 times the groundwater level.

8. The method for dewatering existing basement floor slabs in high-water-head areas as described in claim 1, characterized in that, The pressure measuring tube extends to the bottom of the second precipitation channel.

9. The method for dewatering existing basement floor slabs in high-water-head areas as described in claim 1, characterized in that, A rubber water-stop ring is provided between the sleeve and the opening and closing device.

10. The method for dewatering existing basement slabs in high-water-head areas as described in claim 1, characterized in that, The water pump pipe is wrapped with gauze.

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