Anti-floating drainage method for active pressure reduction and passive pressure relief of impervious soil layer
Through a prefabricated anti-floating drainage system composed of prefabricated blind grooves and filter wells, combined with active pressure reduction and passive pressure relief mechanisms, the problem of water pressure increase in the bottom plate caused by pipeline blockage in traditional water discharge pressure reduction and anti-floating methods is solved, and the effect of stable pressure relief and structural anti-floating is achieved.
Patent Information
- Application Number
- CN202510733719.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-04
- Publication Date
- 2025-08-12
AI Technical Summary
In the traditional method of water discharge and pressure reduction and anti-floating, the basement floor water pressure rises after the pipeline is blocked and cannot effectively relieve pressure, resulting in structural damage. The construction quality is greatly affected by human factors, and there is a lack of effective water pressure monitoring devices.
The prefabricated anti-floating drainage system consisting of prefabricated blind grooves, filter wells and drainage pipes is adopted. Combined with active pressure reduction and passive pressure relief mechanisms, the bottom plate water pressure is accurately controlled through water pressure gauge monitoring and pumping, and a pressure reduction tube and drainage pipe are set up to ensure that the water pressure is within a safe range.
It realizes stable pressure relief of the basement floor, reduces construction quality fluctuations, and has the ability to release pressure actively and passively, avoids structural damage and reduces repair costs, ensuring long-term anti-floating effect.
Smart Images
Figure CN120465442A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of basement anti-floating technology, and in particular to an anti-floating drainage method for active pressure reduction and passive pressure relief in impermeable soil layers. Background Art
[0002] Currently, methods for preventing basement buoyancy include weight ballast, anchor rods, and water drainage. The weight ballast method uses the building's own weight to balance the buoyancy of water. It is generally used when the difference between the building's own weight and the buoyancy of water is small. However, this method is costly and affects basement floor heights. For existing buildings, it may require structural reinforcement, so it is currently less commonly used. The anchor rod method is widely used, but it is expensive and requires a long construction period. It is suitable for situations with high groundwater levels and is not cost-effective for impermeable layers without a constant groundwater level. In addition, for traditional water drainage, pressure reduction and anti-floating, there is a problem that the pipes are gradually blocked during long-term use, which makes it impossible to reduce the water pressure of the basement floor in the later period, causing the basement floor to arch under the influence of water buoyancy, damaging the basement structure. At the same time, in the traditional water drainage and anti-floating construction, the blind ditch is mostly composed of crushed stone, and the construction quality is greatly affected by human factors, requiring higher management costs for quality control. If the construction quality is not good, the entire drainage system will not be able to truly play the role of pressure relief and anti-floating. In addition, there is no supporting basement floor water pressure monitoring device, which results in the floor being damaged before it is realized. At this time, irreversible damage has already occurred, increasing the repair cost. Summary of the Invention
[0003] The present invention aims to provide an anti-floating drainage method for active and passive pressure reduction of impermeable soil layers, so as to solve the problem that when the pipeline is blocked, the water pressure of the basement floor increases and water drainage and pressure reduction cannot be achieved, resulting in damage to the floor.
[0004] The present invention is achieved by adopting the following technical solutions:
[0005] The present invention provides an anti-floating drainage method for active pressure reduction and passive pressure relief in an impermeable soil layer, comprising the following steps:
[0006] S1: Make prefabricated blind ditch;
[0007] S2: Excavation of blind ditch, filter well and collection pit on site;
[0008] S3: Install a prefabricated blind ditch in the blind ditch groove, connect two adjacent prefabricated blind ditches, and connect the prefabricated blind ditch with the water filter well;
[0009] S4: Construction of water filtration well;
[0010] S5: Construction of brick formwork for water collection pit;
[0011] S6: Install a drainage pipe and a pressure-reducing pipe between the water filter well and the sump. The pressure-reducing pipe includes a vertical pipe and a horizontal pipe. The bottom end of the vertical pipe is placed in the water filter well, and the top end of the vertical pipe is higher than the design elevation of the top surface of the bottom plate. One end of the horizontal pipe is connected to the vertical pipe, and the other end of the horizontal pipe extends into the sump. After installing the drainage pipe and the pressure-reducing pipe, backfill the water filter well with gravel.
[0012] S7: Construction of waterproof layer, cushion layer, base plate and sump;
[0013] S8: Install a water pressure gauge at the top of the vertical pipe, install a stop valve at the end of the horizontal pipe extending into the sump, install a drain pipe in the sump, connect the drain pipe to the water pump, and connect the end of the horizontal pipe extending into the sump to the drain pipe.
[0014] As the preferred technical solution:
[0015] In step S1, the prefabricated blind ditch includes a blind ditch pipe, a water-filtration geotextile and a permeable concrete layer. The water-filtration geotextile is wrapped around the outside of the blind ditch pipe, and the permeable concrete layer is wrapped around the outside of the water-filtration geotextile. Both ends of the blind ditch pipe extend out of the permeable concrete layer, and a hole is opened on the blind ditch pipe.
[0016] As the preferred technical solution:
[0017] When excavating the blind ditch trench in step S2, the blind ditch trench is excavated in a grid pattern to form a longitudinal blind ditch trench and a transverse blind ditch trench, the filter well is excavated at the intersection of the longitudinal blind ditch trench and the transverse blind ditch trench, and the sump is excavated in the middle of the grid formed by the longitudinal blind ditch trench and the transverse blind ditch trench;
[0018] In step S3, a plurality of prefabricated blind gutters are installed in the longitudinal blind gutters and the transverse blind gutters, so that the plurality of prefabricated blind gutters are arranged in a grid shape.
[0019] As the preferred technical solution:
[0020] In step S3, after the blind ditch trench is excavated, the blind ditch trench is first leveled with sand, and then a water-filtration geotextile is laid in the trench, and then the prefabricated blind ditch is placed on the water-filtration geotextile and wrapped tightly; when installing the prefabricated blind ditch, the prefabricated blind ditch located next to the water filtration well is connected to the water filtration well;
[0021] Use pipe clamps to connect the ends of the blind ditch pipes of two adjacent prefabricated blind ditches, and then backfill gravel at the joints of the blind ditch pipes;
[0022] Then backfill gravel on both sides of the prefabricated blind ditch and between the blind ditch grooves and tamp them.
[0023] As the preferred technical solution:
[0024] In step S4, constructing the water filtration well includes laying water filtration geotextile on the bottom and side walls of the water filtration well.
[0025] As the preferred technical solution:
[0026] The drainage pipe in step S6 is inserted into the water filtration well. Holes are opened around the pipe section and holes are also opened at the bottom of the vertical pipe. When installing the drainage pipe, the drainage pipe is wrapped with water filtration geotextile and installed tilted toward the sump.
[0027] As the preferred technical solution:
[0028] When installing the drainage pipe and the pressure-reducing pipe in step S6, a water stop ring is welded where the drainage pipe and the pressure-reducing pipe pass through the side wall of the sump.
[0029] As the preferred technical solution:
[0030] Step S7 specifically includes: constructing a waterproof layer above the prefabricated blind ditch, constructing a cushion layer and a bottom plate in sequence on the waterproof layer, and constructing a concrete layer on the inner side of the brick formwork of the sump.
[0031] As the preferred technical solution:
[0032] In step S8, after the drainage pipe is connected to the water pump, the water pump is connected to the cast iron pipe.
[0033] As the preferred technical solution:
[0034] The method further comprises:
[0035] S9: Carry out equipment debugging;
[0036] S10: Conduct acceptance.
[0037] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:
[0038] 1. The present invention is used for basement floor pressure relief and anti-floating construction. During normal use, groundwater enters the water filter well through the prefabricated blind ditch and flows into the sump through the drainage pipe, achieving normal passive pressure relief during daily work. At this time, the stop valve is closed and the water pump pumps the water in the sump through the drainage pipe.
[0039] When the drainage pipe becomes clogged, passive pressure relief fails, and the water pressure under the baseplate increases. This pressure can be monitored using a water pressure gauge. When the water pressure exceeds the design requirement, the shut-off valve installed on the pressure-reducing pipe is opened, and the water pump pumps the water in the sump through the drain pipe. At the same time, the water pump pumps the water in the filter well through the pressure-reducing pipe, thereby reducing the water pressure under the baseplate. This actively and precisely reduces the pressure under the baseplate, ensuring that the water pressure under the baseplate remains within a safe range. This method can achieve stable and long-term water pressure control under the baseplate, making the structure anti-floating.
[0040] 2. The present invention adopts prefabricated blind ditch and assembled construction, which makes the construction more stable, ensures that the water filtration section of the blind ditch meets the design requirements, guarantees the water filtration effect, solves the problem that the construction quality of traditional blind ditch is greatly affected by human factors, and also speeds up the construction period of the blind ditch.
[0041] 3. The present invention is provided with a pressure-reducing pipe, and a water pressure gauge is provided on the pressure-reducing pipe. The water pressure under the bottom plate is monitored by the water pressure gauge, so that the water pressure under the bottom plate can be grasped in real time, and response can be made in advance to avoid realizing the problem until the bottom plate is damaged in the later stage. Performing pressure reduction treatment in advance can avoid damage to the bottom plate and reduce repair costs.
[0042] 4. The present invention has the ability of active pressure reduction and passive pressure relief by setting a pressure-reducing pipe and a drainage pipe, which can solve the problem that the anti-floating effect of the traditional pressure relief system is reduced after being blocked for a long time, resulting in damage to the bottom plate. BRIEF DESCRIPTION OF THE DRAWINGS
[0043] Figure 1 This is a flow chart of the anti-floating drainage method for active pressure reduction and passive pressure relief in impermeable soil layers described in the present invention.
[0044] Figure 2 This is a schematic diagram of the layout of the prefabricated blind ditch, water filtration well, and sump described in the present invention.
[0045] Figure 3 It is a front view of the prefabricated blind ditch described in the present invention.
[0046] Figure 4 It is a left view of the prefabricated blind ditch described in the present invention.
[0047] Figure 5 It is a front view of the plastic blind ditch pipe described in the present invention.
[0048] Figure 6 This is a connection diagram of the prefabricated blind ditch described in the present invention.
[0049] Figure 7 This is a schematic diagram of the installation of the prefabricated blind ditch described in the present invention.
[0050] Figure 8 This is a schematic diagram of the connection between the water filtration well and the sump according to the present invention.
[0051] Figure 9 for Figure 8 Cross-section view in the AA direction.
[0052] Icons: 1-prefabricated blind ditch, 2-plastic blind ditch pipe, 3-permeable concrete layer, 4-water filtration geotextile, 5-pipe clamp, 6-gravel, 7-drainage pipe, 8-pressure-reducing pipe, 9-water pressure gauge, 10-water pump, 11-cast iron pipe, 12-brick membrane, 13-water filtration well, 14-sump, 15-stop valve, 16-pad, 17-base plate, 18-vertical pipe, 19-horizontal pipe. DETAILED DESCRIPTION
[0053] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.
[0054] Example 1
[0055] like Figures 1-9 As shown, this embodiment provides an anti-floating drainage method for active pressure reduction and passive pressure relief in impermeable soil layers, comprising the following steps:
[0056] S1: Make a prefabricated blind ditch 1.
[0057] The prefabricated blind ditch 1 is made by factory prefabrication, such as Figure 3 and Figure 4 As shown, the prefabricated blind ditch 1 includes a plastic blind ditch pipe 2, a water-filtration geotextile 4 and a permeable concrete layer 3. The water-filtration geotextile 4 is wrapped around the outside of the plastic blind ditch pipe 2, and the permeable concrete layer 3 is coated around the outside of the water-filtration geotextile 4.
[0058] Among them, the plastic blind ditch pipe 2 adopts φ110mm finished plastic blind ditch pipe 2; the water filter geotextile 4 adopts 300g / m 2 Filter geotextile 4; permeable concrete layer 3 is formed by supporting formwork and pouring permeable concrete mixed with crushed stone 6 with a particle size of 7-15mm, and the concrete strength is C30.
[0059] In this embodiment, the cross-sectional dimensions of the prefabricated blind ditch 1 are 300 mm×300 mm, and the length is 1 m or 2 m, but the dimensions are not limited thereto. The dimensions of the prefabricated blind ditch 1 can be customized as needed.
[0060] like Figure 5 As shown, the plastic blind ditch pipe 2 is provided with a plurality of φ15mm small holes, with a spacing of 5cm between two adjacent small holes. Both ends of the plastic blind ditch pipe 2 extend 3100mm out of the permeable concrete layer, facilitating the connection of the two prefabricated blind ditches 1.
[0061] S2: Excavation of blind ditch, water filter well 13 and water collection pit 14 on site.
[0062] Earth excavation is carried out according to the design dimensions of the prefabricated blind ditch 1, the filter well 13 and the sump 14.
[0063] like Figure 2 As shown, when the blind ditch trench is excavated, the blind ditch trench is excavated in a grid shape to form a longitudinal blind ditch trench and a transverse blind ditch trench. The filter well 13 is excavated at the intersection of the longitudinal blind ditch trench and the transverse blind ditch trench, and the sump 14 is excavated in the middle position of the grid formed by the longitudinal blind ditch trench and the transverse blind ditch trench.
[0064] S3: Install a prefabricated blind ditch 1 in the blind ditch groove, connect two adjacent prefabricated blind ditches 1, and connect the prefabricated blind ditch 1 with the water filtration well 13.
[0065] After the blind ditch trench is excavated, the blind ditch trench is first leveled with sand, and then a water-filtering geotextile 4 is laid in the trench, and then the prefabricated blind ditch is placed on the water-filtering geotextile 4 and wrapped tightly;
[0066] like Figure 6 and Figure 7 As shown, a plastic pipe clamp 5 is used to connect the ends of the plastic blind ditch pipes 2 of two adjacent prefabricated blind ditches 1, and then 7-15 mm gravel 6 is backfilled at the joint of the plastic blind ditch pipes 2;
[0067] Then, 7-15 mm crushed stone 6 is backfilled between both sides of the prefabricated blind ditch 1 and the blind ditch groove and compacted.
[0068] When installing the prefabricated blind ditch 1 , the end of the plastic blind ditch pipe 2 of the prefabricated blind ditch 1 located next to the water filter well 13 is extended into the water filter well 13 to connect the prefabricated blind ditch 1 with the water filter well 13 .
[0069] The present invention tightly wraps the plastic blind ditch pipe 2 with the water-filtering geotextile 4. After the prefabricated blind ditch 1 is installed, it can ensure that groundwater flows into the blind ditch pipe 2 after being filtered and is smoothly discharged into the water filter well 13.
[0070] Since the blind ditch trenches are excavated in a grid pattern in step S2, when the prefabricated blind ditch 1 is installed, multiple prefabricated blind ditches 1 are arranged in a grid pattern, and the spacing between the prefabricated blind ditches 1 in the longitudinal and transverse directions is no more than 15m.
[0071] S4: Construction of water filtration well 13.
[0072] After the water filtration well 13 is excavated and formed, the water filtration geotextile 4 is laid on the bottom and side walls of the water filtration well 13 .
[0073] In this embodiment, the top of the water filter well 13 is flush with the bottom of the cushion layer 16 , and the size of the water filter well 13 is 1 m×1 m×1 m.
[0074] S5: Construction of 14-brick formwork for the water collection pit.
[0075] Sintered shale solid bricks are used to build brick formwork on the side walls and bottom of the sump 14. After laying, 2 cm thick cement mortar is applied on the surface of the solid bricks. The mass ratio of cement to sand in the cement mortar is 1:3.
[0076] In this embodiment, the internal dimensions of the sump 14 are 1.5 m (length) x 1 m (width) x 1.5 m (depth).
[0077] S6: As Figure 8 and Figure 9 As shown, a drainage pipe 7 and a pressure-reducing pipe 8 are installed between the water filter well 13 and the sump 14, so that one end of the drainage pipe 7 extends into the water filter well 13, and the other end of the drainage pipe 7 extends into the sump 14. The pressure-reducing pipe 8 adopts a T-type pipe, which includes a vertical pipe 18 and a horizontal pipe 19. The bottom end of the vertical pipe 18 is placed in the water filter well 13, and the top of the vertical pipe 18 is higher than the design elevation of the top surface of the basement floor 17. One end of the horizontal pipe 19 is connected to the middle of the vertical pipe 18, and the other end of the horizontal pipe 19 extends into the sump 14; after installing the drainage pipe 7 and the pressure-reducing pipe 8, the gravel 6 is backfilled in the water filter well 13.
[0078] In this embodiment, a DN100×2mm drainage pipe 7 and a DN50×1.2mm pressure-reducing pipe 8 are buried between the water filtration well 13 and the sump 14. The drainage pipe 7 and the pressure-reducing pipe 8 are both made of 304 stainless steel. The buried height of the drainage pipe 7 and the horizontal pipe 19 are both 10 cm below the bottom of the cushion layer 16.
[0079] When installing the drainage pipe 7, the drainage pipe 7 is inserted into the water filter well 1350cm. The pipe section of the drainage pipe 7 inserted into the water filter well 13 is surrounded by holes of φ15mm, and the hole spacing is 5cm.
[0080] When installing the drainage pipe 7 , the water-filtering geotextile 4 is wrapped around the outside of the drainage pipe 7 , and the drainage pipe 7 is installed tilted toward the sump 14 , with the slope of the drainage pipe 7 being 0.5%.
[0081] When installing the riser 18, make sure that the bottom of the riser 18 is 20 cm away from the bottom of the filter well 13. The riser 18 is surrounded by φ10 mm holes with a hole spacing of 2 cm. The upper end of the riser 18 extends not less than 50 cm above the finished surface of the base plate 17.
[0082] When installing the drainage pipe 7 and the pressure-reducing pipe 8, weld the water stop ring at the drainage pipe 7 and the pressure-reducing pipe 8 through the side wall of the sump 14. Make the drainage pipe 7 and the pressure-reducing pipe 8 extend into the finished surface of the sump 14 side wall by 10 cm.
[0083] Backfill the water filter well 13 with 10-31.5 mm graded gravel 6.
[0084] S7: Construct waterproof layer, cushion layer 16, bottom plate 17 and sump 14.
[0085] A waterproof layer is constructed above the prefabricated blind ditch 1 , a cushion layer 16 and a bottom plate 17 are constructed in sequence on the waterproof layer, and a concrete layer is constructed on the inner side of the brick formwork of the sump 14 .
[0086] The cushion layer 16 and the bottom plate 17 are formed by pouring concrete.
[0087] S8: Install a water pressure gauge 9 at the top of the vertical pipe 18, install a stop valve 15 at one end of the horizontal pipe 19 extending into the sump 14, install a drainage pipe in the sump 14, connect the drainage pipe to the water pump 10, and connect the water pump 10 to the cast iron pipe 11 to pump the water in the sump 14 to the municipal pipe network or for secondary utilization. At the same time, the end of the horizontal pipe 19 extending into the sump 14 is connected to the drainage pipe to complete the construction of the anti-floating drainage system.
[0088] Among them, the drainage pipe uses DN100×2mm stainless steel pipe.
[0089] After the concrete construction of the waterproof layer, cushion layer 16, sump 14 and bottom plate 17 is completed, the drainage pipe, stop valve 15, water pump 10 and the like are installed.
[0090] In this embodiment, two water pumps 10 are provided on top of the drainage pipe in the sump 14, one for use and the other for standby.
[0091] S9: Debug the water pump 10, water pressure gauge 9, pipelines and other equipment;
[0092] S10: Acceptance of the forming dimensions, pipe connection quality, and system pressure reduction and drainage performance of the water filtration well 13 and the sump 14.
[0093] The present invention is used for basement floor pressure relief and anti-floating construction. During normal use of the anti-floating drainage system, groundwater enters the water filter well 13 through the prefabricated blind ditch 1 and flows into the sump 14 through the drainage pipe 7, achieving normal passive pressure relief during daily work. At this time, the stop valve 15 is closed, and the water pump 10 pumps the water in the sump 14 away through the drainage pipe.
[0094] When the drainage pipe 7 is clogged, the passive pressure relief fails and the water pressure under the bottom plate 17 increases. The water pressure can be monitored by the water pressure gauge 9. When the water pressure exceeds the design requirements, the stop valve 15 installed on the pressure-reducing pipe 8 is opened, and the water pump 10 pumps the water in the sump 14 out through the drain pipe. At the same time, the water pump 10 pumps the water in the filter well 13 out through the pressure-reducing pipe 8, thereby reducing the water pressure under the bottom plate 17. Active and precise pressure reduction is performed under the bottom plate 17 to ensure that the water pressure of the bottom plate 17 is always within a safe range. After the water in the sump 14 is pumped out, the clogged drainage pipe 7 can be dredged or maintained. The anti-floating drainage system can achieve stable and long-term water pressure control under the bottom plate 17, realizing structural anti-floating.
[0095] The present invention adopts a prefabricated blind ditch 1 and an assembled construction method, which makes the construction more stable, ensures that the water filtering section of the blind ditch meets the design requirements, guarantees the water filtering effect, solves the problem that the construction quality of the traditional blind ditch is greatly affected by human factors, and also speeds up the construction period of the blind ditch.
[0096] The present invention is provided with a pressure-reducing pipe 8, and a water pressure gauge 9 is provided on the pressure-reducing pipe 8. The water pressure under the bottom plate 17 is monitored by the water pressure gauge 9, so that the water pressure under the bottom plate 17 can be grasped in real time, and a response can be made in advance to avoid realizing the problem until the bottom plate 17 is damaged in the later stage. The pressure reduction treatment is performed in advance, which can avoid the bottom plate 17 from being damaged and reduce the repair cost.
[0097] The present invention provides the system with the ability of active pressure reduction and passive pressure relief by setting the pressure reducing pipe 8 and the drainage pipe 7, which can solve the problem that the anti-floating effect of the traditional pressure relief system is reduced after being blocked during long-term use, resulting in damage to the bottom plate 17.
[0098] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.
Claims
1. An anti-floating drainage method for active pressure reduction and passive pressure relief in impermeable soil layers, characterized by: The following steps are involved: S1: Make prefabricated blind ditch; S2: Excavation of blind ditch, filter well and collection pit on site; S3: Install a prefabricated blind ditch in the blind ditch groove, connect two adjacent prefabricated blind ditches, and connect the prefabricated blind ditch with the water filter well; S4: Construction of water filtration well; S5: Construction of brick formwork for water collection pit; S6: Install a drainage pipe and a pressure-reducing pipe between the water filter well and the sump. The pressure-reducing pipe includes a vertical pipe and a horizontal pipe. The bottom end of the vertical pipe is placed in the water filter well, and the top end of the vertical pipe is higher than the design elevation of the top surface of the bottom plate. One end of the horizontal pipe is connected to the vertical pipe, and the other end of the horizontal pipe extends into the sump. After installing the drainage pipe and the pressure-reducing pipe, backfill the water filter well with gravel. S7: Construction of waterproof layer, cushion layer, base plate and sump; S8: Install a water pressure gauge at the top of the vertical pipe, install a stop valve at the end of the horizontal pipe extending into the sump, install a drain pipe in the sump, connect the drain pipe to the water pump, and connect the end of the horizontal pipe extending into the sump to the drain pipe.
2. The anti-floating drainage method for active pressure reduction and passive pressure relief in impermeable soil layers according to claim 1, characterized in that: In step S1, the prefabricated blind ditch includes a blind ditch pipe, a water-filtration geotextile and a permeable concrete layer. The water-filtration geotextile is wrapped around the outside of the blind ditch pipe, and the permeable concrete layer is wrapped around the outside of the water-filtration geotextile. Both ends of the blind ditch pipe extend out of the permeable concrete layer, and a hole is opened on the blind ditch pipe.
3. The anti-floating drainage method for active pressure reduction and passive pressure relief in impermeable soil layers according to claim 1, characterized in that: When excavating the blind ditch trench in step S2, the blind ditch trench is excavated in a grid pattern to form a longitudinal blind ditch trench and a transverse blind ditch trench, the filter well is excavated at the intersection of the longitudinal blind ditch trench and the transverse blind ditch trench, and the sump is excavated in the middle of the grid formed by the longitudinal blind ditch trench and the transverse blind ditch trench; In step S3, a plurality of prefabricated blind gutters are installed in the longitudinal blind gutters and the transverse blind gutters, so that the plurality of prefabricated blind gutters are arranged in a grid shape.
4. The anti-floating drainage method for active pressure reduction and passive pressure relief in impermeable soil layers according to claim 2, characterized in that: In step S3, after the blind ditch trench is excavated, the blind ditch trench is first leveled with sand, and then a water-filtration geotextile is laid in the trench, and then the prefabricated blind ditch is placed on the water-filtration geotextile and wrapped tightly; when installing the prefabricated blind ditch, the prefabricated blind ditch located next to the water filtration well is connected to the water filtration well; Use pipe clamps to connect the ends of the blind ditch pipes of two adjacent prefabricated blind ditches, and then backfill gravel at the joints of the blind ditch pipes; Then backfill gravel on both sides of the prefabricated blind ditch and between the blind ditch grooves and tamp them.
5. The anti-floating drainage method for active pressure reduction and passive pressure relief in impermeable soil layers according to claim 1, characterized in that: In step S4, constructing the water filtration well includes laying water filtration geotextile on the bottom and side walls of the water filtration well.
6. The anti-floating drainage method for active pressure reduction and passive pressure relief in impermeable soil layers according to claim 1, characterized in that: The drainage pipe in step S6 is inserted into the water filtration well. Holes are opened around the pipe section and holes are also opened at the bottom of the vertical pipe. When installing the drainage pipe, the drainage pipe is wrapped with water filtration geotextile and installed tilted toward the sump.
7. The anti-floating drainage method for active pressure reduction and passive pressure relief in impermeable soil layers according to claim 1, characterized in that: When installing the drainage pipe and the pressure-reducing pipe in step S6, a water stop ring is welded where the drainage pipe and the pressure-reducing pipe pass through the side wall of the sump.
8. The anti-floating drainage method for active pressure reduction and passive pressure relief in impermeable soil layers according to claim 1, characterized in that: Step S7 specifically includes: constructing a waterproof layer above the prefabricated blind ditch, constructing a cushion layer and a bottom plate in sequence on the waterproof layer, and constructing a concrete layer on the inner side of the brick formwork of the sump.
9. The anti-floating drainage method for active pressure reduction and passive pressure relief in impermeable soil layers according to claim 1, characterized in that: In step S8, after the drainage pipe is connected to the water pump, the water pump is connected to the cast iron pipe.
10. The anti-floating drainage method for active pressure reduction and passive pressure relief in impermeable soil layers according to claim 1, characterized in that: Also includes: S9: Carry out equipment debugging; S10: Conduct acceptance.