Pressure-reducing water drawing well mechanism for liquefiable stratum of underground structure

Abstract

The decompression water drawing well mechanism comprises a water guide gravel layer located below the underground structure, a plurality of water drawing wells are arranged on the water guide gravel layer and evenly distributed around the underground structure, the bottoms of the water drawing wells are connected with the top of the water guide gravel layer, and the bottom of the water drawing wells is connected with the bottom of the water guide gravel layer. The top of the water drawing well extends upwards to the ground; a water pump and a water pressure sensor are arranged in the water drawing well, and a water pressure controller, a water pump controller and a water conveying pipe valve correspondingly matched with the water drawing well are arranged on the ground; the water suction pump is suspended in the water drawing well through the water conveying pipe, the water conveying pipe extends to the ground from the water drawing well, and the water conveying pipe valve is arranged on the water conveying pipe. The water pressure sensor is in communication connection with the water pressure controller, the water pump is in communication connection with the water pump controller, and the water pump controller is in communication connection with the water pressure controller and the water conveying pipe valve. According to the utility model, the labor cost and errors caused by human factors are reduced, the purpose of intelligently dissipating the pore water pressure is achieved, and the efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of civil engineering, in particular to a pressure-reducing water well mechanism used in liquefiable strata of underground structures. Background Art

[0002] The construction and operation of underground structures inevitably involve crossing liquefied strata. During earthquakes, these strata are extremely susceptible to disturbance. Because water in the soil cannot be drained promptly, pore water pressure rises, causing the soil to lose its original strength and stability. Large-scale soil liquefaction can occur, potentially causing underground structures such as subway stations, tunnels, utility corridors, and buried pipelines to move with the rise and fall of liquefied soil. This can lead to structural deformation, tilting, subsidence, or even damage, significantly impacting the normal operation of cities and the lives of residents. Therefore, when underground structures cross liquefied strata, it is crucial to design anti-liquefaction measures for the foundation to ensure the safety of the underground structure and surrounding structures.

[0003] Ground liquefaction occurs when water pressure between soil particles in water-saturated soil, caused by vibration or other factors, increases to a point where it exceeds the effective stress, leading to a decrease in soil strength and a loss of foundation bearing capacity. Therefore, taking measures to drain water from the soil and reduce pore water pressure is crucial for managing liquefiable formations.

[0004] There is little research in China on intelligent treatment of liquefiable strata. To avoid foundation liquefaction or reduce its impact, there are currently several treatment methods:

[0005] (1) Foundation improvement and replacement: Improve the density and strength of the soil through methods such as compaction, vibration, and grouting, or use special equipment to mix curing agents such as cement and lime into the soil to improve its physical properties.

[0006] (2) Drainage and pressure relief measures: Rapidly lower the groundwater level and reduce pore water pressure by introducing drainage facilities, or replace the original liquefied soil with coarse-grained soil or gravel to improve drainage and strength.

[0007] (3) Gravity foundation and pile foundation: By increasing the weight of the structure's foundation to resist the buoyancy caused by liquefaction, or by transferring the weight of the building to the deep soil layer through piling, avoiding the liquefaction layer. This method can use types such as buried piles and friction piles.

[0008] However, these methods are generally difficult to implement and costly, and their effectiveness in preventing liquefaction in liquefiable strata of underground structures is often not ideal. Therefore, the market is constantly searching for new solutions. Therefore, the market urgently needs technical solutions that can provide better liquefaction prevention effects. Utility Model Content

[0009] In response to the above technical problems in the related art, the present invention proposes a pressure-reducing water well mechanism for underground structures in easily liquefied strata, which can overcome the above-mentioned shortcomings of the prior art.

[0010] In order to achieve the above technical objectives, the technical solution of the present utility model is implemented as follows:

[0011] A pressure-reducing water well mechanism for an underground structure in a liquefiable stratum comprises a water-conducting gravel layer located below the underground structure, a plurality of water wells arranged on the water-conducting gravel layer, all of which are distributed around the underground structure, the bottoms of the water wells being connected to the top of the water-conducting gravel layer, and the tops of the water wells extending upward to the ground; a water pump and a water pressure sensor are arranged in the water well, and a water pressure controller, a water pump controller and a water pipe valve corresponding to the water well are arranged on the ground; the water pump is suspended in the water well through a water pipe, the water pipe extends from the water pump well to the ground, and the water pipe valve is arranged on the water pipe; the water pressure sensor is communicatively connected to the water pressure controller, the water pump is communicatively connected to the water pump controller, and the water pump controller is communicatively connected to the water pressure controller and the water pipe valve, respectively.

[0012] Preferably, the communication connection is achieved through a wired or wireless manner.

[0013] Preferably, communication connections are achieved between the water pressure sensor and the water pressure controller, between the water pump and the water pump controller, between the water pump controller and the water pressure controller, and between the water pump controller and the water pipe valve through cables.

[0014] Preferably, a concrete cushion layer is provided between the water-conducting gravel layer and the base plate of the underground structure.

[0015] Preferably, drainage and water storage facilities corresponding to the water drawing well are also provided on the ground, and the water pipe extends all the way from the water drawing well to the drainage and water storage facilities.

[0016] Preferably, the drainage and water storage facility is a water tank or a municipal pipeline.

[0017] Preferably, the water-conducting gravel layer comprises a plurality of staggered gravel belt layers.

[0018] Preferably, the water-conducting gravel layer comprises a plurality of transverse gravel strip layers and longitudinal gravel strip layers vertically connected to each other.

[0019] Preferably, the water well is located at the intersection of the transverse gravel belt layer and the longitudinal gravel belt layer.

[0020] Preferably, the water well is located at the intersection of the edges of the water-conducting gravel layer.

[0021] Preferably, the width or length of the water-conducting gravel layer is greater than the width or length of the underground structure. Parameters such as the length, width, and area of ​​the water-conducting gravel layer are set as needed to meet the requirements of liquefaction prevention.

[0022] Preferably, the footprint of the water-conducting gravel layer is larger than the footprint of the underground structure.

[0023] Preferably, all water wells are symmetrically distributed on both sides of the underground structure, depending on specific needs.

[0024] The beneficial effects achieved by the present invention are as follows: the present application sets a transverse gravel strip layer, a longitudinal gravel strip layer and a pressure-reducing water-drawing well in the easily liquefied foundation of the underground structure, utilizes the through-connected water-conducting gravel layer to quickly discharge the pore water into the pressure-reducing water-drawing well, and then uses a water pressure sensor, a water pressure controller, a water pump, a water pump controller and a water pipe valve to detect the water pressure and discharge the water in the well to the water storage tank or the municipal pipeline in time, thereby realizing continuous operation and real-time monitoring, reducing labor costs and errors caused by human factors, achieving the purpose of intelligently dissipating pore water pressure, and improving efficiency.

[0025] Furthermore, this application solves the following technical problems: (A) By connecting the transverse and longitudinal gravel bands to form channels, this application can promptly drain pore water from liquefiable formations to a pressure-reducing well. During an earthquake, the pore water pressure in liquefiable formations rises, and the effective stress between soil particles decreases. The presence of the transverse and longitudinal gravel bands effectively drains water, dissipates pore water pressure, restores the effective stress between soil particles, and prevents liquefaction.

[0026] (B) This application uses transverse and longitudinal crushed stone strips to create a densification effect on the surrounding soil during construction, thereby increasing the density of the soil and enhancing the liquefaction resistance of the stratum.

[0027] (C) This application can obtain the water pressure signal in the pressure-reducing water well through a water pressure sensor and a water pressure controller, realize real-time detection and control, and use a water pump, a water pump controller, a water pipe and a water pipe valve to promptly pump out the water introduced into the well by the water-conducting gravel layer and discharge it into a water storage tank or a municipal pipeline to avoid damage to the underground structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The utility model is described in further detail below with reference to the accompanying drawings.

[0029] Figure 1 It is a top view of the pressure-reducing water well mechanism based on double-row piles and pull-out piles described in the utility model.

[0030] Figure 2 yes Figure 1A cross-sectional view taken at angle AA (i.e., a cross-sectional view taken from the main perspective of the pressure-reducing water well mechanism).

[0031] In the figure: 1. Underground structure; 2. Water well; 3. Horizontal gravel strip layer; 4. Vertical gravel strip layer; 5. Concrete cushion layer; 6. Water pump; 7. Water pressure sensor; 8. Water pipe; 9. Water pressure controller; 10. Water pump controller; 11. Water pipe valve; 12. Drainage and water storage facilities; 13. Ground; 14. Liquefiable stratum. DETAILED DESCRIPTION

[0032] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, rather than all the embodiments.

[0033] like Figure 1-2 As shown, in order to facilitate understanding of the above technical solutions of the present invention, the above technical solutions of the present invention are described in detail below through specific usage methods.

[0034] The pressure-reducing water-drawing well mechanism based on double-row piles and pull-out piles includes a water-conducting gravel layer located below the underground structure 1, with a plurality of water-drawing wells 2 provided on the water-conducting gravel layer. All the water-drawing wells 2 are distributed around the underground structure 1, with the bottom of the water-drawing well 2 connected to the top of the water-conducting gravel layer, and the top of the water-drawing well 2 extending upward to the ground 13; a water pump 6 and a water pressure sensor 7 are provided in the water-drawing well 2, and a water pressure controller 9, a water pump controller 10 and a water pipe valve 11 corresponding to the water-drawing well 2 are provided on the ground 13; the water pump 6 is suspended in the water-drawing well 2 through a water pipe 8, and the water pipe 8 extends from the water-drawing well 2 to the ground 13, and the water pipe valve 11 is provided on the water pipe 8; the water pressure sensor 7 is communicatively connected to the water pressure controller 9, the water pump 6 is communicatively connected to the water pump controller 10, and the water pump controller 10 is communicatively connected to the water pressure controller 9 and the water pipe valve 11 respectively.

[0035] In one embodiment, the communication connection is achieved through wired or wireless means.

[0036] In one embodiment, communication connections are respectively achieved between the water pressure sensor 7 and the water pressure controller 9, between the water pump 6 and the water pump controller 10, between the water pump controller 10 and the water pressure controller 9, and between the water pump controller 10 and the water pipe valve 11 through cables.

[0037] In one embodiment, a concrete cushion layer 5 is provided between the water-conducting gravel layer and the bottom plate of the underground structure 1 .

[0038] In one embodiment, a drainage and water storage facility 12 corresponding to the water drawing well 2 is further provided on the ground 13 , and the water pipe 8 extends all the way from the water drawing well 2 to the drainage and water storage facility 12 .

[0039] In one embodiment, the drainage water storage facility 12 is preferably a water tank or a municipal pipeline.

[0040] In one embodiment, the water-conducting gravel layer includes a plurality of staggered gravel strips.

[0041] In one embodiment, the water-conducting gravel layer includes a plurality of transverse gravel strip layers 3 and longitudinal gravel strip layers 4 that are vertically connected to each other.

[0042] In one embodiment, the water well 2 is located at the intersection of the transverse gravel belt layer 3 and the longitudinal gravel belt layer 4.

[0043] In one embodiment, the water well 2 is preferably located at the intersection of the edges of the water-conducting gravel layer.

[0044] In one embodiment, the width or length of the water-conducting gravel layer is preferably greater than the width or length of the underground structure 1. The length, width, area and other parameters of the water-conducting gravel layer are set according to specific needs to meet the requirements of anti-liquefaction.

[0045] In one embodiment, the area occupied by the water-conducting gravel layer is preferably larger than the area occupied by the underground structure 1 .

[0046] In one embodiment, all the water wells 2 are preferably symmetrically distributed on both sides of the underground structure 1, depending on specific needs.

[0047] The principle is illustrated by an example: the pressure-reducing water-drawing well mechanism includes a transverse gravel belt layer 3, a longitudinal gravel belt layer 4 and a water-drawing well 2. The water-conducting gravel layer (which may include a transverse gravel belt layer 3 and a longitudinal gravel belt layer 4) is arranged in the easily liquefied stratum 14 below the bottom plate of the underground structure 1. Under the action of seismic load, the pore water pressure in the easily liquefied stratum 14 rises significantly, and the pore water will be guided into the water-drawing well 2 by the water-conducting gravel layer. The water pressure sensor 7 can be set against the wall of the water-drawing well 2 to receive the water pressure signal in the well, and the water pressure sensor 7 can be connected to the water pressure controller 9 through a cable communication. The water pump 6 is vertically suspended in the water-drawing well 2 through the water pipe 8, and the water pump 6 is connected to the water pump controller 10 through a cable communication, and the water pump controller 10 is also connected to the water pipe valve 11 through a cable communication.

[0048] Before use, a pre-set threshold water pressure range is set for the water pressure controller 9, which could potentially damage the underground structure 1. When the water pressure signal detected by the water pressure sensor 7 is transmitted to the water pressure controller 9, the water pressure controller 9 detects that the water pressure signal reaches the threshold, transmitting an activation signal to the water pump controller 10, thereby activating the system. The water pump controller 10 then controls the water pipe valve 11 to open. Simultaneously, the water pump controller 10 activates the pumping pump 6, pumping water from the well 2 through the water pipe 8 to the drainage and water storage facility 12 (a reservoir or municipal pipeline). As the water is pumped, the water pressure in the well 2 decreases until the water pressure detected by the water pressure sensor 7 and the water pressure controller 9 falls below the threshold again. The water pressure controller 9 then transmits a stop signal to the pump controller 10. The pump controller 10 then controls the pumping pump 6 to stop, and simultaneously closes the water pipe valve 11, completing the entire intelligent drainage process. The concrete cushion layer 5 ensures smooth contact between the floor of the underground structure 1 and the transverse and longitudinal crushed stone strips 3 and 4, thereby protecting the foundation. The technical means of activating or deactivating the device by detecting the threshold within the warning water pressure range is common knowledge and will not be further described here.

[0049] In the liquefiable foundation or stratum of the underground structure 1, a transverse gravel strip layer 3, a longitudinal gravel strip layer 4 and a water drawing well 2 can be set up, and the pore water can be quickly discharged into the water drawing well 2 by utilizing the through-connected water-conducting gravel layer. Then, the water pressure is detected by the water pressure sensor 7, the water pressure controller 9, the water pump 6, the water pump controller 10 and the water pipe valve 11, and the water in the well is promptly discharged to the drainage and water storage facility 12 (water storage tank or municipal pipeline), thereby realizing continuous operation and real-time monitoring, reducing labor costs and errors caused by human factors, achieving the purpose of intelligently dissipating pore water pressure, and improving efficiency.

[0050] In summary, the present application adopts the above-mentioned unique technical solution to solve the following technical problems: (A). The present application forms a channel by connecting the transverse gravel strip layer and the longitudinal gravel strip layer, which can discharge the pore water in the easily liquefied formation to the pressure-reducing water well in time. During an earthquake, the pore water pressure in the easily liquefied formation increases, and the effective stress between the soil particles decreases. The presence of the transverse and longitudinal gravel strip layers can better drain water, evacuate the pore water pressure, restore the effective stress between the soil particles, and avoid liquefaction of the soil layer. (B). During the construction process, the present application uses the transverse gravel strip layer and the longitudinal gravel strip layer to produce a densification effect on the surrounding soil, thereby increasing the density of the soil and enhancing the anti-liquefaction ability of the formation. (C) This application can obtain the water pressure signal in the pressure-reducing water well through a water pressure sensor and a water pressure controller, realize real-time detection and control, and use a water pump, a water pump controller, a water pipe and a water pipe valve to promptly pump out the water introduced into the well by the water-conducting gravel layer and discharge it into a water storage tank or a municipal pipeline to avoid damage to the underground structure.

[0051] In the description of the present invention, it should be understood that the indicated orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention 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, it cannot be understood as a limitation on the present invention.

Claims

1. A pressure-reducing water well mechanism for underground structures prone to liquefaction, characterized in that: The invention comprises a water-conducting gravel layer located below an underground structure (1), a plurality of water-drawing wells (2) being provided on the water-conducting gravel layer, all of the water-drawing wells (2) being distributed around the underground structure (1), the bottoms of the water-drawing wells (2) being connected to the top of the water-conducting gravel layer, and the tops of the water-drawing wells (2) extending upward to the ground (13); The water well (2) is provided with a water pump (6) and a water pressure sensor (7), and the ground (13) is provided with a water pressure controller (9), a water pump controller (10) and a water pipe valve (11) corresponding to the water well (2); The water pump (6) is suspended in the water well (2) via a water pipe (8), the water pipe (8) extends from the water well (2) to the ground (13), and the water pipe valve (11) is arranged on the water pipe (8); the water pressure sensor (7) is communicatively connected to the water pressure controller (9), the water pump (6) is communicatively connected to the water pump controller (10), and the water pump controller (10) is communicatively connected to the water pressure controller (9) and the water pipe valve (11), respectively.

2. The pressure-reducing water well mechanism according to claim 1, wherein: The communication connection is achieved through a wired or wireless manner.

3. The pressure-reducing water well mechanism according to claim 2, wherein: The water pressure sensor (7) and the water pressure controller (9), the water pump (6) and the water pump controller (10), the water pump controller (10) and the water pressure controller (9), and the water pump controller (10) and the water pipe valve (11) are respectively connected to each other via cables.

4. The pressure-reducing water well mechanism according to claim 1, wherein: A concrete cushion layer (5) is provided between the water-conducting gravel layer and the bottom plate of the underground structure (1).

5. The pressure-reducing water well mechanism according to claim 1, wherein: A drainage and water storage facility (12) corresponding to the water drawing well (2) is also provided on the ground (13), and the water pipe (8) extends all the way from the water drawing well (2) to the drainage and water storage facility (12).

6. The pressure-reducing water well mechanism according to claim 5, wherein: The drainage and water storage facility (12) is preferably a water tank or a municipal pipeline.

7. The pressure-reducing water well mechanism according to claim 1, wherein: The water-conducting gravel layer comprises a plurality of staggered and connected gravel belt layers.

8. The pressure-reducing water well mechanism according to claim 7, wherein: The water-conducting gravel layer comprises a plurality of transverse gravel strip layers (3) and longitudinal gravel strip layers (4) that are vertically connected to each other.

9. The pressure-reducing water well mechanism according to claim 8, wherein: The water well (2) is located at the intersection of the transverse gravel belt layer (3) and the longitudinal gravel belt layer (4).

10. The pressure-reducing water well mechanism according to claim 9, wherein: The water well (2) is preferably located at the intersection of the edge of the water-conducting gravel layer.

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