A system for dewatering a coral limestone geological foundation pit

Abstract

The utility model relates to the technical field of marine environmental protection, concretely relates to a system for coral reef limestone geological foundation pit dewatering, including first dewatering pit, second dewatering pit, partition and drainage ditch. First dewatering pit is located the outside of construction land, second dewatering pit is located the side of first dewatering pit away from construction land, the pit bottom depth of second dewatering pit is greater than the pit bottom depth of first dewatering pit, partition is located between first dewatering pit and second dewatering pit, and partition is composed of coral reef limestone, and one end between drainage ditch and second dewatering pit is equipped with water pumping pipe, and the other end of drainage ditch is connected with sea outlet. The application can reduce the turbidity of the water body extracted in the foundation pit dewatering process by arranging the first dewatering pit, the second dewatering pit and the partition wall of coral reef limestone on the outside of the construction land, and avoid the water body with high turbidity directly discharged into the ocean.

Description

Technical Field

[0001] This utility model relates to the field of marine environmental protection technology, and in particular to a system for dewatering in coral reef limestone geological foundation pits. Background Technology

[0002] In coastal engineering construction, foundation pit dewatering is a common construction step. Typically, construction companies install pumping equipment around the foundation pit to directly discharge the extracted groundwater into the ocean. However, when the geological conditions in coastal areas are coral reef limestone, the water extracted during foundation pit dewatering exhibits high turbidity. This high turbidity water does not meet the relevant standards and requirements for direct discharge into the sea. If discharged directly into the ocean without treatment, the ecological environment of the surrounding waters will be severely damaged, posing a direct threat to the survival and reproduction of marine life. Therefore, it is urgent to develop an effective treatment scheme for foundation pit dewatering under coastal coral reef limestone geological conditions to reduce turbidity, meet discharge requirements, and protect the marine ecological environment. Utility Model Content

[0003] The purpose of this invention is to overcome the problem in existing technologies where, when the geological conditions in coastal areas are coral reef limestone, the water extracted during foundation pit dewatering exhibits high turbidity. To address this, a system for dewatering foundation pits in coral reef limestone geological conditions is provided.

[0004] This utility model provides a system for dewatering in coral reef limestone geological foundation pits, comprising: The first dewatering pit is located outside the construction land; The second dewatering pit is located on the side of the first dewatering pit away from the construction land; the bottom depth of the second dewatering pit is greater than the bottom depth of the first dewatering pit; A partition wall, located between the first and second precipitation pits, is constructed of coral reef limestone; A drainage ditch, wherein a pumping pipe is provided between one end of the drainage ditch and the second precipitation pit, and the other end of the drainage ditch is connected to the sea outlet.

[0005] The coral reef limestone is a sedimentary rock formed from the remains of reef-building coral colonies after their death, through biochemical cementation, gravity compaction, and subsequent cold metamorphism. The coral reef limestone has a mesoporous structure, which effectively traps suspended particles in groundwater, thus exhibiting a certain filtration effect.

[0006] This invention provides a system for dewatering a foundation pit in coral reef limestone geology. The first dewatering pit collects groundwater seeping from the construction site. The second dewatering pit receives water from the first dewatering pit and flows through a partition wall. The bottom depth of the second dewatering pit is greater than that of the first dewatering pit. This design ensures that after water is pumped out of the second dewatering pit, its water level remains below that of the first dewatering pit, thus guaranteeing a continuous flow of water from the first dewatering pit into the second dewatering pit. The partition wall is constructed using the characteristics of coral reef limestone. It not only separates the first and second dewatering pits but also naturally filters the water flowing from the first to the second dewatering pit, effectively reducing its turbidity. The pumping pipe pumps water from the second dewatering pit to the drainage channel, which then guides the water to the outlet to the sea, ultimately discharging it into the ocean.

[0007] This invention, by rationally arranging the first and second dewatering pits outside the construction site, along with the partition wall utilizing coral reef limestone, can reduce the turbidity of the water extracted during the foundation pit dewatering process, thus preventing highly turbid water from being directly discharged into the ocean. This solution makes full use of the geological conditions of coral reef limestone, is not only environmentally friendly, but also helps to save on the costs associated with reducing water turbidity.

[0008] The cross-sectional shape of the partition wall can be rectangular or trapezoidal.

[0009] Preferably, the width of the first dewatering pit is 2 to 4 times the width of the second dewatering pit. The purpose of this design is to ensure that the volume of the first dewatering pit is larger than that of the second dewatering pit, thereby giving the first dewatering pit a greater water storage capacity and effectively reducing large fluctuations in water level. Simultaneously, this design helps to achieve a dynamic balance between the amount of water flowing from the first dewatering pit into the second dewatering pit and the amount of water pumped from the second dewatering pit into the drainage ditch.

[0010] Preferably, the cross-section of the partition wall is rectangular. Compared to a trapezoidal cross-section, designing the cross-section of the partition wall as rectangular ensures that the water flow path length from the first drainage pit to the second drainage pit remains consistent at all height positions of the partition wall, thereby helping to improve filtration efficiency.

[0011] Preferably, geogrids are provided on both sides of the partition wall, and the geogrids are fixed to the partition wall by soil nails. The soil nails are used to fix the geogrids to the partition wall, and the geogrids are used to enhance the integrity and stability of the partition wall and prevent collapse.

[0012] Preferably, the two sides of the partition wall are provided with light-blocking fabric. Because the sidewalls of the partition wall in contact with the water are exposed to sunlight for extended periods, moss can grow on these sidewalls. This moss forms a layer on the sidewalls, hindering water flow from the first drainage pit into the second drainage pit and reducing filtration efficiency. To solve this problem, this solution uses the light-blocking fabric to cover the sidewalls of the partition wall, thereby blocking direct sunlight from reaching the sidewalls and reducing moss growth. Furthermore, if the light-blocking fabric becomes covered with moss, it can be replaced promptly.

[0013] The shading fabric can be a black shade net, ordinary fabric, or black non-woven fabric. The black shade net is made of aging-resistant polyethylene or high-density polyethylene.

[0014] Preferably, the light-blocking fabric is black non-woven fabric or black shade netting. The black non-woven fabric and black shade netting are low-cost, easy to fix, and convenient for regular replacement.

[0015] Preferably, the drainage ditch is provided with several woven meshes, each woven mesh arranged along the cross-section of the drainage ditch, and each woven mesh is uniformly provided with fiber ball filter media. The main function of the woven meshes is to fix the fiber ball filter media and prevent it from being washed away by the water flow. The fiber ball filter media can further filter suspended particulate matter in the water, effectively reducing the turbidity of the water extracted during the foundation pit dewatering process. In addition, the combined design of the woven meshes and the fiber ball filter media also facilitates periodic disassembly and cleaning, thereby enabling reuse.

[0016] Preferably, the outlet includes a rubble wall, with both ends connected to a dike and one side connected to the drainage channel. The rubble wall is constructed of stacked rubble blocks with gaps between them, which act as channels for water flow. Water in the drainage channel flows from one side of the rubble wall through the gaps within it, ultimately flowing towards the ocean. The primary function of the rubble wall is to slow the water flow towards the ocean, thereby reducing the scouring intensity of the seabed in the outlet area.

[0017] Preferably, the discharge outlet further includes a first antifouling curtain and a second antifouling curtain, both of which are arranged in the ocean; the two ends of the first antifouling curtain are respectively connected to the dikes at both ends of the rubble wall, and the two ends of the second antifouling curtain are respectively connected to the dikes at both ends of the rubble wall; the first antifouling curtain is located between the rubble wall and the second antifouling curtain. In this scheme, the first and second antifouling curtains are used to contain suspended particulate matter in the construction wastewater discharged into the ocean, confining it to a specific area and preventing these suspended particulate matter from spreading to a wider marine area.

[0018] The cross-sectional shape of the rubble wall can be rectangular or trapezoidal.

[0019] Preferably, the rubble wall has a trapezoidal cross-section, and the slope of the side of the rubble wall that connects to the drainage ditch is greater than the slope of the side of the rubble wall facing the ocean. Compared to a rectangular cross-section, the trapezoidal cross-section design of the rubble wall helps to improve its stability.

[0020] Compared with the prior art, the beneficial effects of this utility model are as follows: This utility model provides a system for dewatering foundation pits in coral reef limestone geology. By reasonably arranging the first dewatering pit, the second dewatering pit, and the partition wall using coral reef limestone outside the construction site, the turbidity of the water extracted during the foundation pit dewatering process can be reduced, thus preventing highly turbid water from being directly discharged into the ocean. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of a system for dewatering a foundation pit in coral reef limestone geology.

[0022] Figure 2 for Figure 1 Cross-sectional view at the location of the AA section line.

[0023] Figure 3 for Figure 1 Cross-sectional view of the section line in the middle BB.

[0024] Marked in the image: 1- First precipitation pit, 2-Partition wall, 3- Second precipitation pit, 4-Water pump pipe, 5. Construction land, 6-Water pump, 7-Drainage ditch, 8-rubble wall, 9-Dike, 10-First anti-fouling curtain, 11-Second anti-fouling curtain, 12-Ocean. Detailed Implementation

[0025] The present invention will be further described in detail below with reference to specific embodiments. However, it should not be construed as limiting the scope of the present invention to the following embodiments; all technologies implemented based on the content of the present invention fall within the scope of the present invention.

[0026] Unless otherwise specified, the terms "upper," "lower," "left," "right," "center," "inner," and "outer" used in the description of specific embodiments of this utility model to indicate orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product / equipment / device is usually placed during use. These terms are merely for the purpose of facilitating the description of the utility model solution or simplifying the description in specific embodiments, and for enabling those skilled in the art to quickly understand the solution, and do not indicate or imply that a specific device / component / element must have a specific orientation, or be constructed and operated in a specific positional relationship. Therefore, they should not be construed as limitations on this utility model.

[0027] Furthermore, the use of terms such as "horizontal," "vertical," "suspended," "parallel," and "coaxial" does not imply that the corresponding device / component / element must be absolutely horizontal, vertical, suspended, parallel, or coaxial. Slight tilt or deviation is permissible, as long as it does not affect the normal function of the relevant component. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," not that the structure must be perfectly horizontal; a slight tilt is acceptable. "Coaxial" means that two components are arranged as coaxially as possible, allowing them to move coaxially or approximately coaxially when their relative positions change. Alternatively, it can be simplified to mean that the corresponding device / component / element, when arranged in "horizontal," "vertical," "suspended," "parallel," or "coaxial" directions, can have an error / deviation of ±10% relative to the corresponding direction, more preferably within ±8%, more preferably within ±6%, more preferably within ±5%, and more preferably within ±4%. For example, the deviation in the "coaxial" direction is controlled within 0.2-1mm, preferably within 0.2-0.5mm. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its function in the present invention.

[0028] Furthermore, the use of terms such as "first," "second," and "third" in terminology is merely for distinguishing descriptions of identical or similar components and should not be interpreted as emphasizing or implying the relative importance of a particular component.

[0029] Furthermore, in the description of the embodiments of this utility model, "several", "multiple", and "several" represent at least two. The number can be any number, such as two, three, four, five, six, seven, eight, or nine, and can even exceed nine.

[0030] Furthermore, in the description of the technical solution of this utility model, unless otherwise explicitly specified / limited / restricted, the terms "set up," "install," "connect," "link," "provided with," "laid out," and "arranged" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to common connection methods in the art, such as welding, riveting, bolting, and threaded connections. Such connections can be mechanical, electrical, or communication connections; they can be direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components.

[0031] Example 1 like Figures 1 to 3 As shown, a system for dewatering a foundation pit in a coral reef limestone geological formation includes a first dewatering pit 1, a second dewatering pit 3, a partition wall 2, and a drainage ditch 7.

[0032] The first dewatering pit 1 is located outside the construction land 5.

[0033] The second dewatering pit 3 is located on the side of the first dewatering pit 1 furthest from the construction land 5; the bottom depth of the second dewatering pit 3 is greater than the bottom depth of the first dewatering pit 1. Specifically, the bottom depth of the second dewatering pit 3 can be 0.3m-0.8m greater than the bottom depth of the first dewatering pit 1. The depth of the first dewatering pit 1 can be 2m, and the depth of the second dewatering pit 3 can be 2.5m.

[0034] The partition wall 2 is located between the first precipitation pit 1 and the second precipitation pit 3, and the partition wall 2 is composed of coral reef limestone.

[0035] A water pumping pipe 4 is installed between one end of the drainage ditch 7 and the second dewatering pit 3, and the other end of the drainage ditch 7 is connected to the sea outlet. Specifically, a water pump 6 is installed in the second dewatering pit 3. The water pump 6 is connected to the water pumping pipe 4. The water pump 6 is used to pump water from the second dewatering pit 3 into the water pumping pipe 4, and then guide the water to the drainage ditch 7 through the water pumping pipe 4.

[0036] In an optional implementation, the width of the first precipitation pit 1 can be 2 to 4 times the width of the second precipitation pit 3, specifically 2 times, 2.5 times, 3 times, 3.5 times, or 4 times.

[0037] In an optional implementation, the cross-section of the partition wall 2 can be rectangular.

[0038] In an optional embodiment, geogrids can be provided on both sides of the partition wall 2, and the geogrids are fixed to the partition wall 2 by soil nails. Specifically, the fixing depth of the soil nails can be 8cm-18cm. The geogrid is a bidirectional plastic geogrid, and the tensile strength of the geogrid in both the transverse and longitudinal directions is between 5kN / m and 50kN / m. The mesh size of the geogrid is between 20mm×20mm and 50mm×50mm, and the specific dimensions can be 20mm×20mm, 30mm×30mm, 40mm×40mm, or 50mm×50mm.

[0039] In an optional embodiment, light-blocking fabric can be provided on both sides of the partition wall 2. Specifically, the light-blocking fabric is fixed to the geogrid on the side away from the partition wall 2. The light-blocking fabric can be fixed to the grid points of the geogrid using cable ties.

[0040] In an optional embodiment, the light-blocking fabric may be black non-woven fabric or black shade netting.

[0041] In an optional embodiment, the drainage channel 7 may be provided with a plurality of woven meshes, each woven mesh being arranged along the cross-section of the drainage channel 7, and each woven mesh being uniformly provided with fiber ball filter media. The two sides and bottom of each woven mesh are fixed to the channel wall of the drainage channel 7. The diameter of the fiber ball filter media may be 25mm, 30mm, 35mm, or 40mm. The fiber ball filter media is fixed at the node positions formed by the intersection of the longitudinal and transverse mesh lines of the woven mesh.

[0042] In an optional embodiment, the outlet may include a rubble wall 8, with both ends of the rubble wall 8 connected to a dike 9 and one side of the rubble wall 8 connected to a drainage ditch 7. Specifically, the rubble wall 8 is constructed of crushed stones with a particle size of 300mm-600mm, and the pores formed between the stones allow water to flow through. The top surface of the rubble wall 8 is lower than the top surface of the drainage ditch 7.

[0043] In an optional embodiment, the outlet may further include a first antifouling curtain 10 and a second antifouling curtain 11, both of which are arranged in the ocean 12; the two ends of the first antifouling curtain 10 are respectively connected to the dikes 9 at both ends of the rubble wall 8, and the two ends of the second antifouling curtain 11 are respectively connected to the dikes 9 at both ends of the rubble wall 8; the first antifouling curtain 10 is located between the rubble wall 8 and the second antifouling curtain 11.

[0044] Pollution containment curtains are environmental protection facilities used at sea outlets. Their main components include a corrosion-resistant and strong curtain body, floats to secure the curtain and maintain its verticality, counterweights to ensure the bottom of the curtain is stable and conforms to the seabed to prevent particulate matter from escaping, and ropes, buckles, and other accessories connecting the various components. These components work together to allow the curtain to be vertically positioned in the water, effectively blocking suspended particulate matter in the discharge and containing it within a limited area, thus preventing pollution of the surrounding marine ecosystem.

[0045] In an optional embodiment, the cross-section of the rubble wall 8 may be trapezoidal, and the slope of the side of the rubble wall 8 that connects to the drainage ditch 7 is greater than the slope of the side of the rubble wall 8 facing the ocean 12.

[0046] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A system for dewatering foundation pits in coral reef limestone geology, characterized in that, include: The first dewatering pit (1) is located outside the construction land (5); The second dewatering pit (3) is located on the side of the first dewatering pit (1) away from the construction land (5); the bottom depth of the second dewatering pit (3) is greater than the bottom depth of the first dewatering pit (1); A partition wall (2) is located between the first precipitation pit (1) and the second precipitation pit (3), and the partition wall (2) is made of coral reef limestone; A drainage ditch (7) is provided with a pumping pipe (4) between one end of the drainage ditch (7) and the second precipitation pit (3), and the other end of the drainage ditch (7) is connected to the sea outlet.

2. The system for dewatering in coral reef limestone geological foundation pits according to claim 1, characterized in that, The width of the first precipitation pit (1) is 2 to 4 times the width of the second precipitation pit (3).

3. A system for dewatering in coral reef limestone geological foundation pits according to claim 1, characterized in that, The cross-section of the partition wall (2) is rectangular.

4. A system for dewatering in coral reef limestone geological foundation pits according to claim 3, characterized in that, Geogrids are provided on both sides of the partition wall (2), and the geogrids are fixed to the partition wall (2) by soil nails.

5. A system for dewatering in coral reef limestone geological foundation pits according to claim 4, characterized in that, The partition wall (2) is provided with light-blocking fabric on both sides.

6. A system for dewatering in coral reef limestone geological foundation pits according to claim 5, characterized in that, The light-blocking fabric is black non-woven fabric or black shade netting.

7. A system for dewatering in coral reef limestone geological foundation pits according to any one of claims 1-6, characterized in that, The drainage ditch (7) is provided with several woven meshes, each woven mesh is arranged along the cross-section of the drainage ditch (7), and each woven mesh is uniformly provided with fiber ball filter material.

8. A system for dewatering in coral reef limestone geological foundation pits according to any one of claims 1-6, characterized in that, The outlet includes a rubble wall (8), with both ends of the rubble wall (8) connected to the dike (9) and one side of the rubble wall (8) connected to the drainage ditch (7).

9. A system for dewatering in coral reef limestone geological foundation pits according to claim 8, characterized in that, The outlet also includes a first anti-fouling curtain (10) and a second anti-fouling curtain (11), both of which are arranged in the ocean (12); the two ends of the first anti-fouling curtain (10) are respectively connected to the dikes (9) at both ends of the rubble wall (8), and the two ends of the second anti-fouling curtain (11) are respectively connected to the dikes (9) at both ends of the rubble wall (8); the first anti-fouling curtain (10) is located between the rubble wall (8) and the second anti-fouling curtain (11).

10. A system for dewatering in coral reef limestone geological foundation pits according to claim 9, characterized in that, The cross-section of the rubble wall (8) is trapezoidal, and the slope of the side of the rubble wall (8) that connects with the drainage ditch (7) is greater than the slope of the side of the rubble wall (8) facing the ocean (12).

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