High-permeability water-rich stratum multi-layer confined water suspension type waterproof curtain pressure reduction and precipitation structure and construction method thereof

Abstract

The high-permeability water-rich stratum multi-layer confined water suspension type waterproof curtain pressure reducing and dewatering structure mainly comprises a water pumping pipe, a profile steel framework, a waterproof steel plate, a special-shaped sleeve and other core assemblies, and an underground diaphragm wall local leakage steel plate plugging technology, a dense mesh framework dewatering well technology and a waterproof sleeve plugging technology are combined; and the precipitation problem of multi-layer confined water in the high-permeability water-rich stratum is effectively solved. The construction method comprises the steps of underground diaphragm wall construction, foundation pit excavation, underground diaphragm wall blocking prevention, dense mesh framework precipitation construction, a precipitation control technology, in-pit well blocking construction and the like, through intelligent precipitation control and an optimized blocking technology, the construction efficiency and quality are improved, the safety risk is reduced, and remarkable economic benefits and social benefits are achieved.

Description

Technical Field

[0001] The invention relates to a high-permeability water-rich stratum multi-layer pressurized water suspended water-stopping curtain pressure-reducing dewatering structure and a construction method thereof, and is mainly applicable to the construction of suspended curtain dewatering in high-pressurized water strata. Background Art

[0002] In highly permeable, water-rich strata, the presence of multiple layers of pressurized water poses a huge challenge to underground engineering construction. Such strata usually have a high permeability coefficient and abundant groundwater, which can easily cause engineering problems such as foundation pit water gushing, sand flow, and collapse, seriously affecting construction safety and progress. Traditional dewatering methods (such as open drainage and well point dewatering) often have limited effects in highly permeable, water-rich strata. It is difficult to effectively control the head pressure of multiple layers of pressurized water, and it may cause settlement of surrounding strata or environmental damage.

[0003] In order to solve this problem, the suspended water-stop curtain pressure reduction and dewatering system came into being. This technology sets a suspended water-stop curtain in the underground continuous wall or curtain pile to separate the high-permeability water-rich strata into several independent hydrological units, and combines intelligent dewatering wells and automated control systems to achieve precise control and pressure reduction of multi-layer confined water.

[0004] In view of this, in order to address a series of problems arising during the construction of a suspended water-stop curtain decompression and precipitation, it is urgent to invent a simple and effective high-permeability, water-rich stratum multi-layer pressurized water suspended water-stop curtain decompression and precipitation structure to improve the construction efficiency and quality of the suspended water-stop curtain decompression and precipitation and reduce safety risks. Summary of the invention

[0005] The purpose of the present invention is to improve the construction efficiency and construction quality of the suspended water-stop curtain pressure reduction and dewatering, reduce safety risks, and has the advantages of significantly saving construction costs and highlighting the efficiency of pit-in-pit construction.

[0006] In order to achieve the above technical objectives, the present invention adopts the following technical solutions:

[0007] The multi-layer pressurized water suspended water-stop curtain pressure-reducing and dewatering structure for high-permeability water-rich strata includes:

[0008] The external pit well and the internal pit pressure relief well. The internal pit pressure relief well is set inside the foundation pit and supported by surrounding purlins and internal supports;

[0009] An underground continuous wall that penetrates the confined water-soil layer and forms a hydrological isolation unit with the pressure relief well in the pit;

[0010] The underground continuous wall local leakage plugging assembly comprises a first waterproof steel plate arranged at the leakage point of the underground continuous wall, a waterproof glue is filled between the first waterproof steel plate and the leakage point, and an upper pull rod and a lower oblique support rod are connected through a hanging ear piece, the upper pull rod and the lower oblique support rod are fixed on the inner support through a hoop piece, and a tension telescopic rod is arranged between the two;

[0011] A fine mesh frame dewatering well includes a steel frame or a steel frame, the outer side of the frame is covered with a steel wire mesh and a fine mesh in sequence, a pumping pipe is arranged inside, the pumping pipe is connected to a side pumping head, and a filter is built into the pumping head and embedded in a gravel layer;

[0012] The waterproof sleeve sealing structure includes a special-shaped wooden plug arranged on the top of the pressure relief well in the pit, a second waterproof steel plate is fixed on the outside of the well pipe, a special-shaped sleeve is arranged on the bottom, the special-shaped sleeve is filled with waterproof concrete through the grouting hole, and is consolidated with the foundation pit cushion layer.

[0013] Furthermore, in the local leakage plugging assembly of the underground continuous wall, the upper pull rod and the lower oblique support rod are rigidly connected to the inner support through the hoop parts, and the telescopic rod is pulled to adjust the fitting pressure between the steel plate and the leakage point.

[0014] Furthermore, the steel frame or steel bar frame of the dense mesh frame precipitation well fixes the wire mesh and the dense mesh through binding straps, and the side pumping head is connected to the frame through steel wires.

[0015] Furthermore, in the waterproof sleeve sealing structure, the special-shaped wooden plug is fixed to the top of the well pipe by means of lifting ears and nails, and the second waterproof steel plate is fixed to the well pipe by means of angle steel welding.

[0016] The present invention also provides a construction method of a multi-layer pressurized water suspended water-stop curtain pressure-reducing and dewatering structure in a high-permeability water-rich stratum, comprising the following steps:

[0017] Step 1: Construction of underground continuous wall: excavate the trench section with trenching equipment, hoist the steel cage and pour concrete after mud wall protection to form an impermeable continuous wall;

[0018] Step 2: Excavation of foundation pit: excavation in layers and sections and use of support structures, real-time monitoring of deformation and water level;

[0019] Step 3: Underground continuous wall blocking: After cleaning the leakage point, install the first waterproof steel plate, adjust the pressure of the steel plate through the upper pull rod, the lower diagonal support rod and the tension telescopic rod, and fill the joints with sealing materials;

[0020] Step 4: Construction of dewatering with dense mesh frame: Assemble the steel frame or steel frame, cover with wire mesh and dense mesh, install the pumping pipe and filter, and hang it into the gravel layer;

[0021] Step 5: Precipitation control: Dynamically adjust the water pump based on the water level sensor to maintain a safe water level;

[0022] Step 6. Sealing the well in the pit: Pour concrete in the pressure relief well in the pit, fix the special-shaped wooden plug and the second waterproof steel plate, and inject waterproof concrete through the special-shaped sleeve to complete the sealing.

[0023] Furthermore, in step three, after the first waterproof steel plate is installed, the anti-seepage effect is verified by a water injection or air pressure test.

[0024] Furthermore, in step 4, the filter screen of the pump head adopts a multi-layer stainless steel mesh with a pore size less than 0.5 mm.

[0025] Furthermore, in step six, the grouting holes of the special-shaped sleeve are distributed in a spiral manner, and the grouting pressure is not less than 1.5 MPa.

[0026] Compared with the prior art, the present invention has the following characteristics and beneficial effects:

[0027] 1. Improve the construction quality of water-stop curtain: The present invention solves the problem of plugging local leakage of underground continuous wall by using the existing internal support system and support rods through the steel plate plugging technology of local leakage of underground continuous wall. The waterproof glue is filled between the first waterproof steel plate and the leakage point, and fixed by the upper pull rod, the lower oblique support rod and the tension telescopic rod to ensure that the steel plate fits tightly with the leakage point, effectively prevent leakage, and improve the overall anti-seepage effect of the water-stop curtain.

[0028] 2. Speed ​​up construction: Through the close-mesh frame precipitation well technology, a precipitation well pipe system composed of wire mesh, close-mesh mesh and steel or steel frame is adopted to solve the problem of stacking and transporting formed well pipes in narrow spaces, reduce the construction difficulty and improve the construction efficiency. In addition, the application of intelligent precipitation control technology can monitor the changes in groundwater levels in real time and dynamically adjust the precipitation rate, further speeding up the construction progress.

[0029] 3. Reduce safety risks: The present invention uses a suspended water-stop curtain pressure reduction and dewatering system to separate the high-permeability water-rich strata into several independent hydrological units. Combined with intelligent dewatering wells and automated control systems, it achieves precise control and pressure reduction of multi-layer pressurized water, effectively reducing the probability of engineering problems such as foundation pit water gushing, sand flow, and collapse, and improving construction safety.

[0030] 4. Save construction costs: This invention reduces the construction costs of traditional precipitation methods (such as open drainage precipitation and well point precipitation) by optimizing precipitation schemes and construction processes. At the same time, the application of intelligent precipitation control technology can efficiently and accurately control the groundwater level, reduce unnecessary water pump operation time and energy consumption, and further reduce construction costs.

[0031] 5. Improve the efficiency of pit-in-pit construction: The present invention uses waterproof sleeve sealing technology to form a pit pressure relief well sealing system composed of special-shaped wooden plugs, special-shaped sleeves and other structures, which improves the overall impermeability of the bottom plate, ensures the smooth progress of pit-in-pit construction, and improves construction efficiency and quality.

[0032] 6. Enhance overall impermeability: Through the waterproof sleeve sealing technology, a special-shaped wooden plug is set on the top of the pressure relief well in the pit, a second waterproof steel plate is fixed on the outside of the well pipe, a special-shaped sleeve is set on the bottom, and waterproof concrete is filled through the grouting holes to ensure the sealing effect of the pressure relief well in the pit and improve the overall impermeability of the foundation pit floor. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a schematic diagram of the suspended curtain dewatering construction of an embodiment of the present invention;

[0034] Figure 2 Schematic diagram of steel plate plugging of local leakage of underground continuous wall according to an embodiment of the present invention;

[0035] Figure 3 It is a plan view of foundation pit support construction according to an embodiment of the present invention;

[0036] Figure 4 Schematic diagram of steel frame dense mesh frame precipitation according to an embodiment of the present invention;

[0037] Figure 5 Schematic diagram of steel bar skeleton dense mesh skeleton precipitation of an embodiment of the present invention;

[0038] Figure 6 Schematic diagram of the pumping head structure of an embodiment of the present invention

[0039] Figure 7 It is a cross-sectional view of a steel bar skeleton dense mesh skeleton water reduction according to an embodiment of the present invention;

[0040] Figure 8 It is a schematic diagram of the well plugging construction in the pit according to an embodiment of the present invention.

[0041] Among them: 1. Well outside the pit; 2. Purlin; 3. Pressure relief well inside the pit; 4. Internal support; 5. Steel frame; 6. Binding strap; 7. Wire mesh; 8. Close mesh; 9. Pumping pipe; 10. Pumping head; 11. Steel frame; 12. Steel wire; 13. Side pumping head; 14. Filter; 15. Gravel; 16. Main pipe; 17. Pressure soil layer; 18. Leakage point of underground continuous wall; 19. Filling layer; 20. Underground continuous wall; 21. Hard layer; 22. Clamps; 23. Lower diagonal support rods; 24. Tension telescopic rods; 25. Upper pull rods; 26. Waterproof glue; 27. First waterproof steel plate; 28. Hanging ear pieces; 29. ​​Concrete; 30. Special-shaped wooden plugs; 31. Second waterproof steel plate; 32. Angle steel; 33. Well pipe; 34. Lifting ear; 35. Bottom plate; 36. Grouting holes; 37. Cushion layer; 38. Waterproof concrete; 39. Special-shaped sleeves; 40. Nails. DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application belong to the scope of protection of this application.

[0043] Those skilled in the art should understand that, in the disclosure of the present application, the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the above terms should not be understood as limiting the present application.

[0044] Embodiment 1

[0045] like Figure 1 , Figure 2 , Figure 3As shown, the present invention provides a multi-layer pressurized water suspended water-stop curtain pressure-reducing and dewatering structure for high-permeability water-rich strata, wherein the curtain dewatering is provided with an outside pit well 1 and an inside pit pressure-reducing well 3, the inside pit pressure-reducing well 3 is arranged inside the foundation pit, an inner support 4 is arranged between the surrounding purlins 2, the high-permeability water-rich stratum is mainly composed of a pressurized water-soil layer 17, a fill layer 19, a hard layer 21, etc., an underground continuous wall 20 and the inside pit pressure-reducing well 3 are driven into the pressurized water-soil layer 17, a first waterproof steel plate 27 is arranged at a leakage point 18 of the underground continuous wall, a waterproof glue 26 is arranged between the leakage point 18 of the underground continuous wall and the first waterproof steel plate 27, a hanging ear 28 is arranged on the first waterproof steel plate 27, an upper pull rod 25 and a lower oblique support rod 23 are arranged on the hanging ear 28, the upper pull rod 25 and the lower oblique support rod 23 are respectively arranged on the inner support 4 through a hoop 22, and a tension telescopic rod 24 is arranged between the upper pull rod 25 and the lower oblique support rod 23.

[0046] like Figure 4 , Figure 5 , Figure 6 , Figure 7 The steel frame 5 shown is provided with a wire mesh 7 outside, and a dense mesh 8 is fixed to the wire mesh 7 by a binding belt 6, and a pumping pipe 9 is provided on the inside of the steel frame 5; the steel frame 11 is provided with a wire mesh 7 and a dense mesh 8 from the inside to the outside, a main pipe 16 is provided in the steel frame 11, a pumping head 10 is provided on the main pipe 16, and a plurality of side pumping heads 13 are provided on the pumping head 10, the side pumping heads 13 are fixed to the steel frame 11 by a steel wire 12, a filter screen 14 is provided in the side pumping head 13, and the dense mesh frame is hoisted into the gravel 15.

[0047] like Figure 8 As shown, a bottom plate 35 is provided above the pressure relief well 3 in the pit, concrete 29 is poured in the pressure relief well 3 in the pit first, a special-shaped wooden plug 30 is provided on the top of the pressure relief well 3 in the pit, a lifting ear 34 is provided on the well pipe 33, a nail 40 is provided on the lifting ear 34 to fix the special-shaped wooden plug 30, a second waterproof steel plate 31 is provided on the outside of the well pipe 33, the second waterproof steel plate 31 and the well pipe 33 are fixed by an angle steel 32, a special-shaped sleeve 39 is provided at the bottom of the second waterproof steel plate 31, the special-shaped sleeve 39 is provided on the cushion layer 37 at the bottom of the foundation pit, a grouting hole 36 is provided on the special-shaped sleeve 39, and waterproof concrete 38 is poured in the special-shaped sleeve 39.

[0048] Embodiment 2

[0049] The construction method of a multi-layer pressurized water suspended water-stop curtain pressure-reducing and dewatering structure in a high-permeability water-rich stratum comprises the following steps:

[0050] 1) Underground continuous wall construction: geological survey and site preparation are carried out before construction, and a guide wall is built as a benchmark; trenching equipment is used to excavate the trench section, and mud is used to protect the wall to prevent collapse; after cleaning the hole, the prefabricated steel cage is hoisted, and the conduit method is used to continuously pour concrete to ensure the wall is dense; the joints are treated for anti-seepage, and finally quality inspection is carried out to ensure that the wall strength, verticality and anti-seepage meet the design requirements.

[0051] 2) Excavation of foundation pit: Conduct detailed geological survey and support design before construction, and formulate excavation plan; select appropriate support methods (such as pile anchor support, underground continuous wall, etc.) according to soil conditions; excavate in layers and sections to avoid excavating too deep at one time; support and drain in time to prevent collapse and water accumulation; strictly control the excavation slope and foundation pit boundary to ensure slope stability; strengthen monitoring, grasp the deformation of the foundation pit and the impact of the surrounding environment in real time, and ensure construction safety.

[0052] 3) Anti-blocking of underground continuous wall; after cleaning the wall surface and repairing the cracks, the prefabricated steel plate is placed close to the wall surface, a first waterproof steel plate 27 is set at the leakage point 18 of the underground continuous wall, a waterproof glue 26 is set between the leakage point 18 of the underground continuous wall and the first waterproof steel plate 27, a hanging ear 28 is set on the first waterproof steel plate 27, an upper pull rod 25 and a lower oblique support rod 23 are set on the hanging ear 28, the upper pull rod 25 and the lower oblique support rod 23 are respectively set on the inner support 4 through the hoop 22, and a tension telescopic rod 24 is set between the upper pull rod 25 and the lower oblique support rod 23; the steel plate joints are treated with sealing materials (such as rubber pads or waterproof glue) to ensure that the joints are tight; the flatness and fixing strength of the steel plate are strictly controlled during the construction process to avoid gaps; after completion, a water injection or air pressure test is carried out to check the leakage and repair it in time to ensure the overall anti-seepage effect.

[0053] 4) Dense mesh skeleton dewatering construction; a wire mesh 7 is arranged outside the steel skeleton 5, and the dense mesh 8 is fixed to the wire mesh 7 by a binding belt 6, and a pumping pipe 9 is arranged inside the steel skeleton 5; the steel skeleton 11 is respectively provided with a wire mesh 7 and a dense mesh 8 from the inside to the outside, and a side pumping head 13 is arranged in the steel skeleton 11, and the pumping head 13 is fixed to the steel skeleton 11 by a steel wire 12, and a filter screen 14 is arranged inside the side pumping head 13, and the dense mesh skeleton is hoisted into the gravel 15.

[0054] 5) Dewatering control technology; design the location and depth of intelligent dewatering wells according to geological conditions and water level distribution; install water level sensors and automatic control systems to monitor groundwater level changes in real time; dynamically adjust the dewatering rate through intelligent regulation of water pump operation to ensure that the water level is stable within a safe range; regularly calibrate sensors during construction to ensure data accuracy; optimize dewatering plans in combination with curtain water-stopping effects to achieve efficient and accurate groundwater level control.

[0055] 6) Well plugging construction in the pit: concrete 29 is first poured in the pressure relief well 3 in the pit, a special-shaped wooden plug 30 is arranged on the top of the pressure relief well 3 in the pit, a lifting lug 34 is arranged on the well pipe 33, a nail 40 is arranged on the lifting lug 34 to fix the special-shaped wooden plug 30, a second waterproof steel plate 31 is arranged on the outside of the well pipe 33, the second waterproof steel plate 31 and the well pipe 33 are fixed by angle steel 32, a special-shaped sleeve 39 is arranged on the bottom of the second waterproof steel plate 31, the special-shaped sleeve 39 is arranged on the cushion layer 37 at the bottom of the foundation pit, a grouting hole 36 is arranged on the special-shaped sleeve 39, and waterproof concrete 38 is poured in the special-shaped sleeve 39.

[0056] The parts not described in detail in this application are prior art, so this application does not describe them in detail.

[0057] It is to be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the element may be multiple, and the term "one" should not be understood as a limitation on the quantity.

[0058] Although this article uses more professional terms, it does not exclude the possibility of using other terms. These terms are used only to more conveniently describe and explain the essence of this application; interpreting them as any additional restrictions is contrary to the spirit of this application.

[0059] The present application is not limited to the above-mentioned optimal implementation mode. Anyone can derive other forms of products under the inspiration of this application. However, no matter what changes are made in the shape or structure, all technical solutions that are the same or similar to those of the present application fall within the protection scope of the present application.

Claims

1. A multi-layer pressurized water suspended water-stop curtain decompression and dewatering structure for high permeability water-rich strata, characterized in that: include: An external well (1) and an internal pressure relief well (3), wherein the internal pressure relief well (3) is arranged inside the foundation pit and supported by surrounding purlins (2) and internal supports (4); An underground continuous wall (20) which penetrates the confined water-soil layer (17) and forms a hydrological isolation unit with the pressure relief well (3) in the pit; An underground continuous wall local leakage plugging component comprises a first waterproof steel plate (27) arranged at a leakage point (18) of the underground continuous wall, a waterproof glue (26) is filled between the first waterproof steel plate (27) and the leakage point, and an upper pull rod (25) and a lower oblique support rod (23) are connected via a hanging ear piece (28), the upper pull rod (25) and the lower oblique support rod (23) are fixed to an inner support (4) via a hoop piece (22), and a tension telescopic rod (24) is provided between the two; A fine mesh frame dewatering well, comprising a steel frame (5) or a steel frame (11), the outer side of the frame being covered with a steel wire mesh (7) and a fine mesh (8) in sequence, the inner side being provided with a pumping pipe (9), the pumping pipe (9) being connected to a side pumping head (13), the pumping head (13) being provided with a built-in filter screen (14) and embedded in a gravel layer (15); The waterproof sleeve plugging structure comprises a special-shaped wooden plug (30) arranged at the top of a pressure relief well (3) in a pit, a second waterproof steel plate (31) is fixed on the outside of a well pipe (33), and a special-shaped sleeve (39) is arranged at the bottom. The special-shaped sleeve (39) is filled with waterproof concrete (38) through a grouting hole (36) and is consolidated with a foundation pit cushion layer (37).

2. The multi-layer pressurized water suspended water-stopping curtain decompression and dewatering structure for high permeability water-rich strata according to claim 1 is characterized in that: In the underground continuous wall local leakage plugging assembly, the upper pull rod (25) and the lower oblique support rod (23) are rigidly connected to the inner support (4) through a hoop (22), and the tension telescopic rod (24) adjusts the fitting pressure between the steel plate (31) and the leakage point.

3. The multi-layer pressurized water suspended water-stop curtain decompression and dewatering structure for high permeability water-rich strata according to claim 1 is characterized in that: The steel frame (5) or steel frame (11) of the dense mesh frame dewatering well fixes the wire mesh (7) and the dense mesh (8) through a binding belt (6), and the side pumping head (13) is connected to the frame through a steel wire (12).

4. The multi-layer pressurized water suspended water-stop curtain pressure-reducing and dewatering structure for high-permeability water-rich strata according to claim 1 is characterized in that: In the waterproof sleeve plugging structure, the special-shaped wooden plug (30) is fixed to the top of the well pipe (33) by means of a lifting lug (34) and a nail (40), and the second waterproof steel plate (31) is fixed to the well pipe (33) by welding with an angle steel (32).

5. The construction method of the multi-layer pressurized water suspended water-stop curtain pressure-reducing and dewatering structure in high-permeability water-rich strata according to any one of claims 1 to 4, characterized in that: The following steps are involved: Step 1: Construction of underground continuous wall: excavate the trench section with trenching equipment, hoist the steel cage and pour concrete after mud wall protection to form an impermeable continuous wall; Step 2: Excavation of foundation pit: excavation in layers and sections and use of support structures, real-time monitoring of deformation and water level; Step 3, underground continuous wall blocking: after cleaning the leakage point, install the first waterproof steel plate (27), adjust the pressure of the steel plate through the upper pull rod (25), the lower oblique support rod (23) and the tension telescopic rod (24), and fill the joint with sealing material; Step 4: Construction of dewatering with a dense mesh frame: assemble a steel frame (5) or a steel frame (11), cover the steel wire mesh (7) and the dense mesh (8), install a water extraction pipe (9) and a filter (14), and hang it in the gravel layer (15); Step 5: Precipitation control: Dynamically adjust the water pump based on the water level sensor to maintain a safe water level; Step 6: Sealing the well in the pit: pour concrete (29) in the pressure relief well (3) in the pit, fix the special-shaped wooden plug (30) and the second waterproof steel plate (31), and inject waterproof concrete (38) through the special-shaped sleeve (39) to complete the sealing.

6. The construction method according to claim 5, characterized in that: In step three, after the first waterproof steel plate (27) is installed, a water injection or air pressure test is performed to verify the anti-seepage effect.

7. The construction method according to claim 5, characterized in that: In step 4, the filter screen (14) of the pumping head (13) is made of a multi-layer stainless steel mesh with a pore size less than 0.5 mm.

8. The construction method according to claim 5, characterized in that: In step six, the grouting holes (36) of the special-shaped sleeve (39) are distributed in a spiral manner, and the grouting pressure is not less than 1.5 MPa.

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