Water pressure control and release system for underground space anti-floating

Abstract

The invention provides a water pressure control and release system for underground space anti-floating, which is characterized in that a vertical pressure relief steel pipe is arranged in a stratum below a basement bottom plate, a through hole is formed in the outer side of the vertical pressure relief steel pipe, a water inlet pipe is further arranged in the basement bottom plate, and the water inlet pipe is connected with a pressure control system; the pressure control system comprises a connecting pipe, a pressure control pipe of an inverted-U-shaped structure, a water pressure gauge and a glass liquid level meter. One end of the connecting pipe is connected with the water inlet pipe, the other end of the connecting pipe is connected with the pressure control pipe, the pressure control pipe is vertically arranged, the water pressure gauge is arranged in the middle of the pressure control pipe, and the glass liquid level meter is arranged at the top end of the pressure control pipe. The anti-floating purpose is achieved in the mode of actively lowering the anti-floating water level of the underground space, the permanent anti-floating function is achieved, the underground water level can be stably controlled for a long time, the anti-floating water pressure is reduced, arrangement of anti-floating components is reduced, the construction cost is saved, the cracking and water seepage risks of a bottom plate are reduced, and the method is suitable for new construction, reconstruction and extension projects.

Description

Technical Field

[0001] This invention relates to the field of anti-buoyancy engineering technology for underground spaces in buildings, and in particular to a water pressure control and release system for anti-buoyancy in underground spaces. Background Technology

[0002] In recent years, several construction projects have experienced buoyancy failures. These failures have stemmed from various factors, including: insufficient geological data, inadequate hydrological experience, and cost considerations leading to inadequate anti-buoyancy design levels; improper groundwater control during construction and defects in the quality of anti-buoyancy components; poor backfilling of foundation pits causing surface water infiltration and resulting in unexpected buoyancy; insufficient stability reserves in the anti-buoyancy design leading to building uplift; and insufficient waterproofing membrane resistance causing cracking, water seepage, and even heaving and deformation of the underground structure's foundation slab. These buoyancy failures in underground spaces not only cause varying degrees of quality and safety problems in construction projects but also result in property damage and even endanger lives and property.

[0003] Currently, the more mature methods for addressing the buoyancy problem in underground spaces mainly include the counterweight method, the structural component method, and the anchor bolt method. The counterweight method is suitable for projects where the difference between buoyancy and resistance is small, but it may occupy underground space and affect its utilization efficiency. The structural component method is suitable for areas with small buoyancy distribution and uneven stiffness; by setting connecting components, the uniformity of stiffness is enhanced, resulting in an overall buoyancy-resistant effect. The anchor bolt method has wide applicability, but its technological requirements and costs are relatively high.

[0004] Current anti-buoyancy technologies are primarily passive, employing structural member anti-buoyancy methods and anchor bolt anti-buoyancy methods. Structural member anti-buoyancy methods have limited applicability and effectiveness, suitable only for areas with lower anti-buoyancy requirements and where the building can be connected to the main building via structural members. While anchor bolt anti-buoyancy methods have a wider range of applications, their technological requirements and costs are higher. Weighted anti-buoyancy methods, while meeting the building's design and functional requirements, supplement anti-buoyancy functions; however, in areas with high groundwater levels, their use alone is insufficient to meet anti-buoyancy requirements. Summary of the Invention

[0005] The technical problem to be solved by this invention is to provide a widely applicable, low-cost water pressure control and release system for anti-buoyancy in underground spaces that integrates permeability, pressure control, collection, and discharge, so as to effectively control and regulate the anti-buoyancy water pressure in underground spaces and achieve the purpose of anti-buoyancy.

[0006] This invention is implemented as follows:

[0007] This invention provides a water pressure control and release system for anti-buoyancy in underground spaces, including a vertical pressure relief steel pipe, a pressure control system, a siphon failure pipe, and a water collection well;

[0008] The vertical pressure relief steel pipe is placed in the stratum below the basement floor slab. A through hole is provided on the outside of the vertical pressure relief steel pipe. A water inlet pipe is also provided inside the basement floor slab. The water inlet pipe is connected to the pressure control system.

[0009] The pressure control system includes a connecting pipe and a pressure control pipe with an inverted U-shaped structure;

[0010] One end of the connecting pipe is connected to the water inlet pipe, and the other end is connected to the pressure control pipe, which is arranged vertically.

[0011] The pressure control pipe is located at the top of the water collection well. After the groundwater flows through the top of the pressure control pipe, it flows into the water collection well through the outlet of the pressure control pipe.

[0012] The siphon breaking tube is located at the top of the pressure control tube;

[0013] The pressure control system also includes a water pressure gauge and a glass level gauge. The water pressure gauge is located in the middle of the pressure control tube, and the glass level gauge is located at the top of the pressure control tube.

[0014] Furthermore, it also includes a forward and reverse flushing system, which includes a forward flushing pipe, a forward flushing valve, a normally open control valve, and a normally closed drain valve;

[0015] The normally open control valve is installed on the pressure control pipe, which is connected to the forward flushing valve. The forward flushing valve is located below the normally open control valve. The forward flushing pipe is connected to the forward flushing valve. The pressure control pipe is also provided with a backflushing valve, which is located below the forward flushing valve. The normally closed drain valve is installed on the connecting pipe and is used to discharge residual sewage to the collection well.

[0016] Furthermore, the basement floor slab includes a basement floor building layer, a basement floor structural layer, and a plain concrete cushion layer. The water inlet pipe is horizontally installed between the basement floor building layer and the basement floor structural layer. The vertical pressure relief steel pipe penetrates the basement floor structural layer and the plain concrete cushion layer and extends into the stratum below the plain concrete cushion layer.

[0017] Furthermore, the vertical pressure relief pipe includes a first pipe unit and a second pipe unit, the first pipe unit and the second pipe unit are connected by a connector of the same diameter, and the upper end of the first pipe unit is connected to the water inlet pipe.

[0018] The first pipe unit is located in the basement floor slab structure layer and plain concrete cushion layer, and a sealing layer is provided on the outside of the first pipe unit to prevent groundwater from rushing into the underground space through the side wall of the vertical pressure relief pipe.

[0019] The second pipe unit is located in the stratum below the plain concrete cushion layer. The second pipe unit has several through holes for allowing groundwater to enter the vertical pressure relief pipe.

[0020] Furthermore, the second tube unit is wrapped with geotextile on the outside.

[0021] Furthermore, the same diameter joint is sealed with foam adhesive or asphalt-impregnated hemp fiber.

[0022] Furthermore, it also includes railings that are fixedly connected to the floor slab, the railings being used to protect the glass level gauge and pressure control tube.

[0023] Furthermore, a civil defense protection valve is installed at the location where the pressure control pipe penetrates the floor slab in the civil defense area.

[0024] The advantages of this invention are as follows: it achieves anti-buoyancy by actively lowering the anti-buoyancy water level in the underground space, providing permanent anti-buoyancy functionality and enabling long-term stable control of the groundwater level. Furthermore, by reducing anti-buoyancy water pressure, it reduces the need for anti-buoyancy components, saving on project costs and minimizing the risk of foundation cracking and seepage. It is applicable to new construction, renovation, and expansion projects. Through a pressure control system, it rationally releases the anti-buoyancy water pressure in the underground space, effectively controlling the inflow and ensuring the success of subsequent maintenance and controllable anti-buoyancy pressure. A positive and negative flushing system ensures unobstructed pipeline flow. Combined with a monitoring system, it constitutes a low-cost underground space anti-buoyancy water pressure control and release system that integrates permeability, pressure control, collection, and discharge. Attached Figure Description

[0025] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0026] Figure 1 This is a schematic diagram of a water pressure control and release system for anti-buoyancy in underground spaces, as described in this invention.

[0027] Figure 2 for Figure 1 A cross-sectional view of the structure shown.

[0028] Figure 3 This is a detailed drawing of the vertical pressure relief steel pipe.

[0029] Explanation of the labels in the diagram:

[0030] 1. Vertical pressure relief steel pipe; 101. Through hole; 102. First pipe unit; 103. Second pipe unit; 2. Pressure control system; 21. Connecting pipe; 22. Pressure control pipe; 23. Water pressure gauge; 24. Glass level gauge; 3. Water collection well; 4. Water inlet pipe; 5. Siphon breaking pipe; 6. Forward and backwashing system; 61. Forward flushing pipe; 62. Forward flushing valve; 63. Normally open control valve; 64. Normally closed drain valve; 65. Backwashing plug; 7. Basement floor slab building layer; 8. Basement floor slab structural layer; 9. Plain concrete cushion layer; 10. Sealing layer; 11. Same diameter joint; 12. Foam adhesive; 13. Asphalt hemp fiber; 15. Railing; 16. Civil defense protection valve; 17. Geotextile. Detailed Implementation

[0031] Please see Figures 1 to 3 The present invention provides a water pressure control and release system for anti-buoyancy in underground space, including a vertical pressure relief steel pipe 1, a pressure control system 2, and a water collection well 3; the vertical pressure relief steel pipe 1 is a galvanized steel pipe with a diameter of DN50;

[0032] The lower end of the vertical pressure relief steel pipe 1 is inserted into the stratum below the basement floor slab. A through hole 101 is provided on the outside of the vertical pressure relief steel pipe 1. A water inlet pipe 4 is also provided inside the basement floor slab. The water inlet pipe 4 is connected to the pressure control system 2. The water inlet pipe 4 is a plastic-lined steel pipe with a diameter of DN100. The arrangement height of the water inlet pipe 4 is lower than the height of the anti-buoyancy water level. The through hole 101 is used to allow groundwater in the stratum below the basement floor slab to seep into the vertical pressure relief steel pipe 1 and flow to the water inlet pipe 4 through the vertical pressure relief steel pipe 1.

[0033] The pressure control system 2 includes a connecting pipe 21 and a pressure control pipe 22 with an inverted U-shaped structure. Both the connecting pipe 21 and the pressure control pipe 22 are plastic-lined steel pipes with a diameter of DN80. The connecting pipe 21 is connected to the inlet pipe 4 through a reducing connector. The installation height and total length of the pressure control pipe 22 are controlled by the design anti-buoyancy water level, which is determined by the setting of passive anti-buoyancy components and the cost of subsequent maintenance. The anti-buoyancy water level is equivalent to the top elevation of the inverted U-shaped pressure control pipe 22.

[0034] One end of the connecting pipe 21 is connected to the water inlet pipe 4, and the other end is connected to the pressure control pipe 22, which is arranged vertically.

[0035] The pressure control pipe 22 is located at the top of the water collection well 3. After the groundwater flows through the top of the pressure control pipe 22, it flows into the water collection well 3 through the outlet of the pressure control pipe 22.

[0036] When the anti-buoyancy water level in the basement is higher than the top elevation of the pressure control pipe 22, the groundwater passes through the inverted U-shaped top of the pressure control pipe 22 and is discharged to the basement sump 3 from the other side of the pressure control pipe 22.

[0037] Specifically, it also includes a siphon breaking tube 5, which is disposed at the top of the pressure control tube 22. The siphon breaking tube 5 is used to prevent the pressure control tube 22 from exhibiting a siphon effect.

[0038] Specifically, it also includes a forward and reverse flushing system 6, which is used to unclog pipes, prevent pipe blockage, ensure smooth flow of subsequent pipes, improve maintenance efficiency, and reduce maintenance costs. In use, it consists of forward flushing and reverse flushing.

[0039] The forward and reverse flushing system 6 includes a forward flushing pipe 61, a forward flushing valve 62, a normally open control valve 63, and a normally closed drain valve 64;

[0040] The normally open control valve 63 is installed on the pressure control pipe 22, which is connected to the forward flush valve 62. The forward flush valve 62 is located below the installation position of the normally open control valve 63. The forward flush pipe 61 is connected to the forward flush valve 62. The pressure control pipe 22 is also provided with a backflushing port 65, which is located below the installation position of the forward flush valve 62. The normally closed drain valve 64 is installed on the connecting pipe 21 and is used to discharge residual sewage to the collection well 3.

[0041] Normally open control valve 63 is closed during forward or backwashing.

[0042] The forward flush valve 62 is open during forward flushing; under normal conditions, the forward flush valve 62 is closed.

[0043] During backflushing, the backflushing faucet 65 is connected to a mobile pressure water pump.

[0044] Specifically, the basement floor slab includes a basement floor building layer 7, a basement floor structural layer 8, and a plain concrete cushion layer 9. The water inlet pipe 4 is horizontally installed between the basement floor building layer 7 and the basement floor structural layer 8. The vertical pressure relief steel pipe 1 penetrates the basement floor structural layer 8 and the plain concrete cushion layer 9 and extends into the stratum below the plain concrete cushion layer 9. The length of the vertical pressure relief steel pipe 1 extending into the stratum is not less than 1.5m.

[0045] Specifically, the vertical pressure relief pipe includes a first pipe unit 102 and a second pipe unit 103. The first pipe unit 102 and the second pipe unit 103 are connected by a connector of the same diameter 11, and the upper end of the first pipe unit 102 is connected to the water inlet pipe 4.

[0046] The first pipe unit 102 is located in the basement floor slab structural layer 8 and plain concrete cushion layer 9, and a sealing layer 10 is provided on the outside of the first pipe unit 102 to prevent groundwater from rushing into the underground space through the side wall of the vertical pressure relief pipe. The sealing layer 10 is formed by injecting flash-setting material on the outside of the first pipe unit 102 after the foam adhesive on the outside of the first pipe unit 102 has initially set, so as to completely block the water inflow path of the groundwater on the side of the first pipe unit 102.

[0047] The second pipe unit 103 is located in the stratum below the plain concrete cushion layer 9. The length of the second pipe unit 103 is not less than 1.5m. The second pipe unit 103 has several through holes 101. The through holes 101 on the vertical pressure relief steel pipe 1 are all set on the second pipe unit 103. The through holes 101 are Φ6@50 twisted holes, which are used to allow groundwater to enter the vertical pressure relief pipe.

[0048] Specifically, the second pipe unit 103 is wrapped with geotextile 17. The geotextile has a specification greater than 150g / m². 2 .

[0049] Specifically, the same diameter joint 11 is sealed with foam adhesive 12 or asphalt-impregnated hemp fiber 13. To prevent groundwater from seeping into the basement floor slab through the side wall pores of the vertical pressure relief steel pipe 1, a same diameter joint 11 is installed at the junction of the vertical pressure relief steel pipe 1 and the plain concrete cushion layer 9, and the outside of the same diameter joint 11 is sealed with foam adhesive or asphalt-impregnated hemp fiber.

[0050] Specifically, the pressure control system 2 also includes a water pressure gauge 23 and a glass level gauge 24. The water pressure gauge 23 is located in the middle of the pressure control pipe 22, and the glass level gauge 24 is located at the top of the pressure control pipe 22. In order to monitor the anti-buoyancy water pressure of the basement, the water pressure gauge 23 is installed in the middle of the pressure control pipe 22, and the glass level gauge 24 is installed at the top of the pressure control pipe 22. The two instruments are combined to dynamically monitor the anti-buoyancy water pressure of the basement.

[0051] Specifically, it also includes a railing 15 that is fixedly connected to the floor slab, the railing 15 being used to protect the glass level gauge 24 and the pressure control tube 22.

[0052] Specifically, the pressure control pipe 22 is equipped with a civil defense protection valve 16 at the location where it penetrates the floor slab in the civil defense area.

[0053] One specific application of this invention is as follows:

[0054] Groundwater seeps into the vertical pressure relief steel pipe 1 through the through hole 101 on the second pipe unit 103. Since the arrangement height of the inlet pipe 4 is lower than the anti-buoyancy water level, after the groundwater enters through the vertical pressure relief steel pipe 1, it first flows into the forward and reverse flushing system 6 through the connecting pipe 21, and then enters the pressure control system 2.

[0055] The anti-buoyancy water level is equal to the top elevation of the inverted U-shaped pressure control pipe 22. When the anti-buoyancy water level in the basement is higher than the top elevation of the pressure control pipe 22, the groundwater passes through the top of the inverted U-shape of the pressure control pipe 22 and is discharged to the sump 3 in the basement from the other side of the pressure control pipe 22.

[0056] To prevent a siphon effect, a siphon-breaking pipe 5 is installed at the top of the pressure control pipe 22. The pressure control pipe 22 is arranged along the wall or structural column using a fixed bracket 18, and a civil defense protection valve 16 is installed when it penetrates the floor slab in the civil defense zone.

[0057] To monitor the anti-floating water pressure in the basement, a water pressure gauge 23 is installed in the middle (waist) of the pressure control pipe 22, and a glass level gauge 24 is installed at the top of the pressure control pipe 22. Two methods are used to dynamically monitor the water pressure.

[0058] After the groundwater is drained into the basement sump 3, the basement drainage system will discharge the water into the municipal pipeline.

[0059] To prevent pipe siltation and blockage, ensure smooth flow of subsequent pipes, improve maintenance efficiency, and reduce maintenance costs, pipe flushing can be divided into forward flushing and reverse flushing.

[0060] During forward flushing, both the flushing water source and water pressure come from groundwater. First, open the forward flushing valve 62 and close the normally open control valve 63 to allow groundwater to flush the pressure control pipe 22 and drain the water into the collection well 3. After forward flushing is complete, open the normally closed drain valve 64 to drain the remaining flushing wastewater into the collection well 3. Finally, restore the valves of the forward flushing valve 62, normally closed drain valve 64, and normally open control valve 63 to their normal positions, i.e., first open the normally open control valve 63, then close the forward flushing valve 62 and normally closed drain valve 64.

[0061] During backflushing, the flushing water source and pressure are provided by a mobile pressure water pump. In use, the normally open control valve 63 is closed, while the forward flushing valve 62 and the normally closed drain valve 64 remain closed. After connecting the backflushing sluice port 65 to the mobile pressure water pump, the backflushing sluice port is opened, and water is supplied by the mobile pressure water pump to backflush the system. The backflushing water is ultimately discharged through the vertical pressure relief steel pipe 1. After backflushing is complete, the normally closed drain valve 64 is opened to discharge the remaining wastewater to the collection well 3. Finally, the valves of the backflushing sluice port, the normally closed drain valve 64, and the normally open control valve 63 are restored to their normal states, i.e., the backflushing sluice port and the normally closed drain valve 64 are closed, and the normally open control valve 63 is opened.

[0062] The advantages of this invention are as follows: it achieves anti-buoyancy by actively lowering the anti-buoyancy water level in the underground space, providing permanent anti-buoyancy functionality and enabling long-term stable control of the groundwater level. Furthermore, by reducing anti-buoyancy water pressure, it reduces the need for anti-buoyancy components, saving on project costs and minimizing the risk of foundation cracking and seepage. It is applicable to new construction, renovation, and expansion projects. Through the pressure control system 2, the anti-buoyancy water pressure in the underground space is released rationally, effectively controlling the inflow and ensuring the success of subsequent maintenance and controllable anti-buoyancy pressure. The positive and negative flushing systems ensure unobstructed pipeline flow. Combined with a monitoring system, this constitutes a low-cost underground space anti-buoyancy water pressure control and release system that integrates permeability, pressure control, collection, and discharge.

[0063] While specific embodiments of the present invention have been described above, those skilled in the art should understand that the specific embodiments described are merely illustrative and not intended to limit the scope of the present invention. Equivalent modifications and variations made by those skilled in the art in accordance with the spirit of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A water pressure control and release system for anti-buoyancy in underground spaces, characterized in that: This includes vertical pressure relief steel pipes, a pressure control system, a siphon rupture pipe, and a water collection well; The vertical pressure relief steel pipe is placed in the stratum below the basement floor slab. A through hole is provided on the outside of the vertical pressure relief steel pipe. A water inlet pipe is also provided inside the basement floor slab. The water inlet pipe is connected to the pressure control system. The pressure control system includes a connecting pipe and a pressure control pipe with an inverted U-shaped structure; One end of the connecting pipe is connected to the water inlet pipe, and the other end is connected to the pressure control pipe, which is arranged vertically. The pressure control pipe is located at the top of the water collection well. After the groundwater flows through the top of the pressure control pipe, it flows into the water collection well through the outlet of the pressure control pipe. The siphon breaking tube is located at the top of the pressure control tube; The pressure control system also includes a water pressure gauge and a glass level gauge. The water pressure gauge is located in the middle of the pressure control tube, and the glass level gauge is located at the top of the pressure control tube.

2. The water pressure control and release system for anti-buoyancy in underground spaces as described in claim 1, characterized in that: It also includes a forward and reverse flushing system, which includes a forward flushing pipe, a forward flushing valve, a normally open control valve, and a normally closed drain valve; The normally open control valve is installed on the pressure control pipe, which is connected to the forward flushing valve. The forward flushing valve is located below the normally open control valve. The forward flushing pipe is connected to the forward flushing valve. The pressure control pipe is also provided with a backflushing valve, which is located below the forward flushing valve. The normally closed drain valve is installed on the connecting pipe and is used to discharge residual sewage to the collection well.

3. The water pressure control and release system for anti-buoyancy in underground spaces as described in claim 1, characterized in that: The basement floor slab includes a basement floor building layer, a basement floor structural layer, and a plain concrete cushion layer. The water inlet pipe is horizontally installed between the basement floor building layer and the basement floor structural layer. The vertical pressure relief steel pipe penetrates the basement floor structural layer and the plain concrete cushion layer and extends into the stratum below the plain concrete cushion layer.

4. A water pressure control and release system for anti-buoyancy in underground spaces as described in claim 3, characterized in that: The vertical pressure relief pipe includes a first pipe unit and a second pipe unit, which are connected by a connector of the same diameter, and the upper end of the first pipe unit is connected to the water inlet pipe. The first pipe unit is located in the basement floor slab structure layer and plain concrete cushion layer, and a sealing layer is provided on the outside of the first pipe unit to prevent groundwater from rushing into the underground space through the side wall of the vertical pressure relief pipe. The second pipe unit is located in the stratum below the plain concrete cushion layer. The second pipe unit has several through holes for allowing groundwater to enter the vertical pressure relief pipe.

5. A water pressure control and release system for anti-buoyancy in underground spaces as described in claim 4, characterized in that: The second tube unit is wrapped with geotextile on the outside.

6. A water pressure control and release system for anti-buoyancy in underground spaces as described in claim 4, characterized in that: The same diameter joints are sealed with foam adhesive or asphalt-impregnated hemp fiber.

7. A water pressure control and release system for anti-buoyancy in underground spaces as described in claim 1, characterized in that: It also includes railings that are fixedly connected to the floor slab, which are used to protect the glass level gauge and pressure control tube.

8. A water pressure control and release system for anti-buoyancy in underground spaces as described in claim 1, characterized in that: The pressure control pipe is equipped with a civil defense protection valve at the location where it penetrates the floor slab in the civil defense area.

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