High permeability water-rich stratum multilayer confined water suspension type water stop curtain pressure relief dewatering structure and construction method thereof

Abstract

The present application relates to a high-permeability water-rich stratum multilayer confined water suspension type water stop curtain pressure reduction and precipitation structure and construction method, mainly including pumping pipe, profile steel skeleton, waterproof steel plate and special-shaped sleeve and other core components, combining with underground continuous wall local leakage steel plate plugging technology, dense mesh net skeleton precipitation well technology and waterproof sleeve plugging technology, effectively solving the precipitation problem of multilayer confined water in high-permeability water-rich stratum. The construction method includes underground continuous wall construction, foundation pit excavation, underground continuous wall plugging, dense mesh net skeleton precipitation construction, precipitation control technology and pit well plugging construction and other steps, through intelligent precipitation control and optimized plugging technology, improving the construction efficiency and quality, reducing the safety risk, having significant economic and social benefits.

Description

Technical Field

[0001] This invention relates to a multi-layered confined water-bearing suspended curtain dewatering structure for depressurization and dewatering in highly permeable, water-rich strata, and its construction method. It is mainly applicable to suspended curtain dewatering construction in highly confined water-bearing strata. Background Technology

[0002] In highly permeable, water-rich strata, the presence of multiple layers of confined aquifers poses a significant challenge to underground engineering construction. These strata typically have high permeability coefficients and abundant groundwater, easily leading to engineering problems such as pit water inrush, quicksand, and collapse, severely impacting construction safety and progress. Traditional dewatering methods (such as open drainage and wellpoint dewatering) often have limited effectiveness in highly permeable, water-rich strata, failing to effectively control the head pressure of the multiple layers of confined aquifers, and potentially causing subsidence of surrounding strata or environmental damage.

[0003] To address this issue, a suspended cutoff curtain depressurization and dewatering system has emerged. This technology involves installing a suspended cutoff curtain within a diaphragm wall or curtain pile, dividing highly permeable, water-rich strata into several independent hydrological units. Combined with intelligent dewatering wells and an automated control system, it enables precise control and depressurization of multi-layered confined aquifers.

[0004] In view of this, in response to a series of problems that arise during the construction of suspended water-stop curtain decompression and dewatering systems, there is an urgent need to invent a simple and effective high-permeability, multi-layered, confined water-bearing suspended water-stop curtain decompression and dewatering structure for water-rich strata, so as to improve the construction efficiency and quality of suspended water-stop curtain decompression and dewatering systems and reduce safety risks. Summary of the Invention

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

[0006] To achieve the above-mentioned technical objectives, the present invention adopts the following technical solution:

[0007] The multi-layered confined aquifer suspension curtain dewatering structure for high-permeability, water-rich strata includes:

[0008] The pit consists of external wells and internal pressure relief wells. The internal pressure relief wells are located inside the pit and are supported by walers and internal bracing.

[0009] The underground continuous wall penetrates the confined soil layer and forms a hydrological isolation unit with the decompression well in the pit;

[0010] The underground continuous wall local leakage plugging assembly comprises a first waterproof steel plate arranged at a leakage point of the underground continuous wall, the first waterproof steel plate is filled with waterproof glue between the leakage point, and the upper pull rod and the lower inclined support rod are connected through the lug piece and fixed to the inner support through the clamp piece, and the stretchable rod is arranged between the upper pull rod and the lower inclined support rod.

[0011] The dense mesh skeleton dewatering well comprises a steel skeleton or a reinforced skeleton, a steel wire mesh and a dense mesh are sequentially wrapped outside the skeleton, a water pumping pipe is arranged inside the skeleton, and a water pumping head is connected to the side of the water pumping pipe.

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

[0013] Further, in the underground continuous wall local leakage plugging assembly, the upper pull rod and the lower inclined support rod are rigidly connected to the inner support through the clamp piece, and the stretchable rod adjusts the adhesion pressure of the steel plate and the leakage point.

[0014] Further, in the dense mesh skeleton dewatering well, the steel wire mesh and the dense mesh are fixed to the steel skeleton or the reinforced skeleton through a bandage, and the side water pumping head is connected to the skeleton through a steel wire.

[0015] Further, in the waterproof sleeve plugging structure, the special-shaped wooden plug is fixed to the top of the well pipe through a lifting lug and a nail, and the second waterproof steel plate is fixed to the well pipe through an angle steel.

[0016] The application also provides a construction method of the high-permeability water-rich stratum multilayer pressure-bearing water suspension type water stop curtain pressure relief dewatering structure, which comprises the following steps:

[0017] Step one, underground continuous wall construction: a trench section is excavated through a trenching device, a reinforcement cage is hoisted and hung after mud wall protection, and concrete is poured to form a continuous anti-seepage wall;

[0018] Step two, foundation pit excavation: the foundation pit is excavated in layers and sections and supported by a support structure, and deformation and water level are monitored in real time;

[0019] Step three, underground continuous wall plugging: a first waterproof steel plate is installed after the leakage point is cleaned, the steel plate pressure is adjusted through an upper pull rod, a lower inclined support rod and a stretchable rod, and a sealing material is filled in the joint;

[0020] Step four, dense mesh skeleton dewatering construction: a steel skeleton or a reinforced skeleton is assembled, a steel wire mesh and a dense mesh are wrapped, a water pumping pipe and a filter screen are installed, and the water pumping pipe and the filter screen are hung in a gravel layer;

[0021] Step five, dewatering control: a water pump is dynamically adjusted and controlled based on a water level sensor to maintain a safe water level;

[0022] Step six, well plugging in the pit: pouring concrete in the pit pressure relief well, fixing the irregular wood plug and the second waterproof steel plate, and completing the plugging by injecting waterproof concrete through the irregular sleeve.

[0023] Further, in step three, the first waterproof steel plate is installed and the impermeability effect is verified by water injection or air pressure test.

[0024] Further, in step four, the filter screen of the pumping head uses a multi-layer stainless steel screen with a pore size less than 0.5mm.

[0025] Further, in step six, the grouting holes of the irregular sleeve are spirally distributed, and the grouting pressure is not less than 1.5MPa.

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

[0027] 1. Improve the construction quality of the waterproof curtain: The present application solves the problem of sealing the local leakage of the underground continuous wall by using the existing inner support system and support rod. The first waterproof steel plate is filled with waterproof glue between the leakage point and the steel plate, and is fixed by the upper pull rod, the lower inclined support rod and the opposite telescopic rod, to ensure that the steel plate is tightly attached to the leakage point, effectively preventing leakage and improving the overall impermeability of the waterproof curtain.

[0028] 2. Speed up the construction: The space-saving well pipe system composed of steel mesh, mesh net and profiled steel or reinforced steel framework solves the problem of stacking and transporting the well pipe in a small space, reduces the construction difficulty and improves the construction efficiency. In addition, the application of intelligent dewatering control technology can monitor the change of underground water level in real time and dynamically adjust the dewatering rate, further speeding up the construction progress.

[0029] 3. Reduce safety risk: The present application divides the high-permeability water-rich stratum into several independent hydrological units by the suspended waterproof curtain pressure relief dewatering system, and combines intelligent dewatering well and automatic control system to realize precise control and pressure relief dewatering of multi-layer confined water, effectively reducing the probability of engineering problems such as foundation pit gushing, sand flow and collapse, and improving the construction safety.

[0030] 4. Save construction cost: The present application optimizes the dewatering scheme and construction process to reduce the construction cost of traditional dewatering methods (such as open drainage and well point dewatering). At the same time, the application of intelligent dewatering control technology can efficiently and accurately control the underground water level, reduce unnecessary water pump operation time and energy consumption, and further reduce the construction cost.

[0031] 5. Improve the efficiency of pit-in-pit construction: the invention improves the overall impermeability of the floor by using waterproof sleeve plugging technology, a pit pressure relief well plugging system composed of special-shaped wooden plugs, special-shaped sleeves and other structures, ensures the smooth progress of pit-in-pit construction, and improves the construction efficiency and quality.

[0032] 6. Enhance overall impermeability: through waterproof sleeve plugging technology, special-shaped wooden plugs are arranged at the top of the pit pressure relief well, the second waterproof steel plate is fixed outside the well pipe, the special-shaped sleeve is arranged at the bottom, and the waterproof concrete is filled through the grouting hole, which ensures the plugging effect of the pit pressure relief well and improves the overall impermeability of the foundation pit floor. BRIEF DESCRIPTION OF DRAWINGS

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

[0034] Figure 2 is a local leakage steel plate plugging schematic diagram of the underground continuous wall of the embodiment of the invention;

[0035] Figure 3 is a foundation pit support construction plan view of the embodiment of the invention;

[0036] Figure 4 is a profile steel framework dense mesh framework dewatering schematic diagram of the embodiment of the invention;

[0037] Figure 5 is a steel framework dense mesh framework dewatering schematic diagram of the embodiment of the invention;

[0038] Figure 6 is a pumping head structure schematic diagram of the embodiment of the invention

[0039] Figure 7 is a steel framework dense mesh framework dewatering cross-sectional view of the embodiment of the invention;

[0040] Figure 8 is a pit well plugging construction schematic diagram of the embodiment of the invention.

[0041] 1, well outside the pit; 2, around the purlin; 3, pit pressure reducing well; 4, inner support; 5, steel skeleton; 6, bandage; 7, steel mesh; 8, dense mesh; 9, pumping pipe; 10, pumping head; 11, steel reinforcement; 12, steel wire; 13, side pumping head; 14, filter screen; 15, gravel; 16, main pipe; 17, pressure-bearing soil layer; 18, ground wall leakage point; 19, fill layer; 20, underground continuous wall; 21, hard layer; 22, hoop piece; 23, lower inclined strut; 24, opposite stretchable rod; 25, upper pull rod; 26, waterproof glue; 27, first waterproof steel plate; 28, lug piece; 29, concrete; 30, special-shaped wooden plug; 31, second waterproof steel plate; 32, angle steel; 33, well pipe; 34, lifting lug; 35, bottom plate; 36, grouting hole; 37, cushion layer; 38, waterproof concrete; 39, special-shaped sleeve; 40, nail. DETAILED DESCRIPTION

[0042] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art belong to the scope of protection of the present application.

[0043] Those skilled in the art should understand that in the disclosure of the present application, the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore the above terms cannot be understood as a limitation of the present application.

[0044] Embodiment one

[0045] As Figure 1 , Figure 2 , Figure 3As shown, the present application provides a high permeability water-rich stratum multilayer confined water suspension type water stop curtain pressure relief dewatering structure, wherein the curtain dewatering is provided with an outside pit well 1 and an inside pit pressure relief well 3, the inside pit pressure relief 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 confined water soil layer 17, a fill layer 19, a hard layer 21, etc., the underground continuous wall 20 and the inside pit pressure relief well 3 are arranged into the confined water soil layer 17, a first waterproof steel plate 27 is arranged at the underground continuous wall leakage point 18, a waterproof glue 26 is arranged between the underground continuous wall leakage point 18 and the first waterproof steel plate 27, a hanging lug 28 is arranged on the first waterproof steel plate 27, an upper pull rod 25 and a lower inclined bracing rod 23 are arranged on the hanging lug 28, the upper pull rod 25 and the lower inclined bracing rod 23 are arranged on the inner support 4 through a hoop 22 respectively, and a tension expansion rod 24 is arranged between the upper pull rod 25 and the lower inclined bracing rod 23.

[0046] As shown in Figure 4 , Figure 5 , Figure 6 , Figure 7 , a steel wire mesh 7 is arranged outside the profile steel framework 5, a dense mesh net 8 is fixed with the steel wire mesh 7 through a binding belt 6, and a water pumping pipe 9 is arranged inside the profile steel framework 5; a steel wire mesh 7 and a dense mesh net 8 are arranged from inside to outside of a reinforced framework 11, a main pipe 16 is arranged in the reinforced framework 11, a water pumping head 10 is arranged on the main pipe 16, a plurality of side water pumping heads 13 are arranged on the water pumping head 10, the side water pumping heads 13 are fixed with the reinforced framework 11 through a steel wire 12, a filter screen 14 is arranged in the side water pumping heads 13, and the dense mesh net framework is hung into the gravel 15.

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

[0048] Example two

[0049] The construction method of the high permeability water-rich stratum multilayer confined water suspension type water stop curtain pressure relief dewatering structure includes the following steps:

[0050] 1) Diaphragm wall construction; geological survey and site preparation before construction, build guide wall as a reference; use trenching equipment to excavate slot section, and use mud wall protection to prevent collapse; after hole cleaning, hoist prefabricated reinforcement cage, use duct method to continuously pour concrete, ensure wall density; handle joint anti-seepage, finally quality detection, ensure wall strength, perpendicularity and anti-seepage meet design requirements.

[0051] 2) Foundation pit excavation; detailed geological survey and support design before construction, develop excavation plan; choose appropriate support method (such as pile anchor support, diaphragm wall, etc.) according to soil conditions; excavate in layers and sections to avoid one-time deep excavation; support and drainage in time to prevent collapse and water accumulation; strictly control excavation slope and foundation pit boundary to ensure slope stability; strengthen monitoring, real-time grasp of foundation pit deformation and surrounding environment influence, ensure construction safety.

[0052] 3) Diaphragm wall anti-blocking; after cleaning the wall surface and repairing cracks, the prefabricated steel plate is tightly attached to the wall surface, the first waterproof steel plate 27 is arranged at the diaphragm wall leakage point 18, the waterproof glue 26 is arranged between the diaphragm wall leakage point 18 and the first waterproof steel plate 27, the hanging ear piece 28 is arranged on the first waterproof steel plate 27, the upper pull rod 25 and the lower inclined strut 23 are arranged on the inner support 4 through the hoop piece 22, and the upper pull rod 25 and the lower inclined strut 23 are arranged between the upper pull rod 25 and the lower inclined strut 23. The upper pull rod 25 and the lower inclined strut 23 are arranged between the upper pull rod 25 and the lower inclined strut 23; the steel plate joint is treated with sealing material (such as rubber pad or waterproof glue) to ensure the tightness of the joint; strictly control the flatness and fixing strength of the steel plate during construction to avoid voids; after completion, carry out water injection or air pressure test, check leakage and repair in time to ensure the overall anti-seepage effect.

[0053] 4) Dense mesh skeleton dewatering construction; steel wire mesh 7 is arranged outside the steel skeleton 5, dense mesh 8 is fixed with steel wire mesh 7 through binding belt 6, and water pumping pipe 9 is arranged on the inner side of steel skeleton 5; steel wire mesh 7 and dense mesh 8 are arranged from inside to outside of steel reinforcement skeleton 11, side water pumping head 13 is arranged in steel reinforcement skeleton 11, steel wire 12 is fixed with steel reinforcement skeleton 11 through side water pumping head 13, filter screen 14 is arranged in side water pumping head 13, and dense mesh skeleton is hung into gravel 15.

[0054] 5) Dewatering control technology; design the position and depth of intelligent dewatering well according to geological conditions and water level distribution; install water level sensor and automatic control system to monitor underground water level change in real time; dynamically adjust dewatering rate through intelligent control of water pump operation to ensure that water level is stable within a safe range; calibrate sensor regularly during construction to ensure data accuracy; optimize dewatering scheme combined with curtain water stop effect to realize efficient and accurate underground water level control.

[0055] 6) pit well plugging construction; first pouring concrete 29 in pit pressure relief well 3, setting special-shaped wood plug 30 on top of pit pressure relief well 3, setting lifting lug 34 on well pipe 33, setting nail 40 on lifting lug 34 to fix special-shaped wood plug 30, setting second waterproof steel plate 31 on outside of well pipe 33, fixing second waterproof steel plate 31 and well pipe 33 through angle steel 32, setting special-shaped sleeve 39 on bottom of second waterproof steel plate 31, setting special-shaped sleeve 39 on base pit bottom cushion layer 37, setting grouting hole 36 on special-shaped sleeve 39, pouring waterproof concrete 38 in special-shaped sleeve 39.

[0056] The part of the present application not described in detail is prior art, so the present application does not describe it in detail.

[0057] It can 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 one element can be one, and in another embodiment, the number of the element can be multiple, and the term "one" cannot be understood as a limitation on the number.

[0058] Although professional terms are used more in this paper, the possibility of using other terms is not excluded. The use of these terms is only to more conveniently describe and explain the essence of the present application; it is contrary to the spirit of the present application to interpret them as any kind of additional limitation.

[0059] The present application is not limited to the above best embodiment, and anyone can derive other various forms of products under the inspiration of the present application, but regardless of any change in shape or structure, any technical solution with the same or similar to the present application falls within the scope of protection of the present application.

Claims

1. A high permeability water-rich formation multilayer confined water suspended water stop curtain pressure relief dewatering structure, characterized in that, It comprises: An out-of-pit well (1) and an in-pit pressure-reducing well (3) which is arranged inside the foundation pit and is supported by a surrounding purlin (2) and an inner support (4); An underground continuous wall (20) which penetrates the confined water soil layer (17) and forms a hydrological isolation unit with the in-pit pressure-reducing well (3); An underground continuous wall local leakage plugging assembly which comprises a first waterproof steel plate (27) arranged at a leakage point (18) of the underground continuous wall, the first waterproof steel plate (27) being filled with waterproof glue (26) between the leakage point, and being connected with an upper pull rod (25) and a lower inclined bracing rod (23) through a hanging ear piece (28), the upper pull rod (25) and the lower inclined bracing rod (23) being fixed on the inner support (4) through a hoop piece (22) and being provided with a tension expansion rod (24) therebetween; A dense-mesh net framework dewatering well which comprises a profiled steel framework (5) or a steel bar framework (11), the outside of the framework being covered with a steel wire net (7) and a dense-mesh net (8) in sequence, and the inside being provided with a water pumping pipe (9), the water pumping pipe (9) being connected with a side edge water pumping head (13), the water pumping head (13) being provided with a filter screen (14) and being embedded in a gravel layer (15); A waterproof sleeve plugging structure which comprises a special-shaped wooden plug (30) arranged at the top of the in-pit pressure-reducing well (3), a second waterproof steel plate (31) fixed outside a well pipe (33), and a special-shaped sleeve (39) arranged at the bottom, the special-shaped sleeve (39) being filled with waterproof concrete (38) through a grouting hole (36) and being consolidated with a foundation pit cushion layer (37).

2. The high permeability water-rich formation multilayer confined water suspended type water stop curtain pressure relief dewatering structure according to claim 1, characterized in that, In the underground continuous wall local leakage plugging assembly, the upper pull rod (25) and the lower inclined bracing rod (23) are rigidly connected with the inner support (4) through the hoop piece (22), and the tension expansion rod (24) adjusts the fitting pressure of the steel plate (31) with the leakage point.

3. The high permeable water-rich formation multilayer confined water suspended type water stop curtain pressure-reducing dewatering structure according to claim 1, characterized in that, In the dense-mesh net framework dewatering well, the profiled steel framework (5) or the steel bar framework (11) fixes the steel wire net (7) and the dense-mesh net (8) through a binding belt (6), and the side edge water pumping head (13) is connected with the framework through a steel wire (12).

4. The high permeable water-rich formation multilayer confined water suspended type water stop curtain pressure-reducing dewatering structure according to claim 1, characterized in that, In the waterproof sleeve plugging structure, the special-shaped wooden plug (30) is fixed at the top of the well pipe (33) through a lifting lug (34) and a nail (40), and the second waterproof steel plate (31) is fixed with the well pipe (33) through an angle steel (32).

5. The construction method of the high-permeability water-rich formation multilayer confined water suspended water-stop curtain pressure-reducing dewatering structure according to any one of claims 1-4, characterized in that, It comprises the following steps: Step one, underground continuous wall construction: a trench section is excavated through a trenching equipment, a reinforcement cage is hoisted and cast-in-situ concrete is poured after mud wall protection, so as to form a continuous impermeable wall; Step two, foundation pit excavation: the foundation pit is excavated in layers and sections and a supporting structure is used, and deformation and water level are monitored in real time; Step three, underground continuous wall plugging: a first waterproof steel plate (27) is installed after the leakage point is cleaned, the steel plate pressure is adjusted through an upper pull rod (25), a lower inclined bracing rod (23) and a tension expansion rod (24), and a joint is filled with a sealing material; Step four, dense-mesh net framework dewatering construction: a profiled steel framework (5) or a steel bar framework (11) is assembled, a steel wire net (7) and a dense-mesh net (8) are covered, a water pumping pipe (9) and a filter screen (14) are installed, and the framework is hoisted and placed into a gravel layer (15); Step five, dewatering control: a water pump is dynamically adjusted based on a water level sensor, and a safe water level is maintained. Step six, well plugging in the pit: pouring concrete (29) in the pit decompression well (3), fixing the special-shaped plug (30) and the second waterproof steel plate (31), and injecting waterproof concrete (38) through the special-shaped sleeve (39) to complete the plugging.

6. The construction method according to claim 5, characterized in that In step three, the first waterproof steel plate (27) is installed and the impermeability effect is verified by water injection or air pressure test.

7. The construction method according to claim 5, characterized in that, In step four, the filter screen (14) of the water pumping head (13) adopts a multi-layer stainless steel screen 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 spirally distributed, and the grouting pressure is not less than 1.5 MPa.

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