A centralized drainage device for large foundation pit in-situ precipitation based on gravity self-flow

Abstract

The utility model discloses a centralized drainage device of large -scale foundation pit pit precipitation based on gravity self -flowing relates to foundation pit drainage equipment technical field, including foundation pit low and set up in the precipitation well of foundation pit low, be equipped with support in the foundation pit low, be equipped with main stem pipe on the support, main stem pipe is equipped with gradient, be equipped with water pump in the precipitation well, water pump passes through short branch pipe and is linked with main stem pipe. Water pump work will be in the water of precipitation well through short branch pipe and be transported to main stem pipe, and the potential energy that relies on pipeline gradient generates overcomes along the way resistance, and natural flow to and discharge outside the foundation pit, thereby realizes the quick discharge of the precipitation in the foundation pit, replaced the high energy -consumption mode of traditional dependence every water pump and overcomes the superlong pipeline resistance, simple structure, low in manufacturing cost, and the practicality is higher.

Description

Technical Field

[0001] This utility model relates to the field of foundation pit drainage equipment technology, and in particular to a centralized drainage device for dewatering in large foundation pits based on gravity flow. Background Technology

[0002] In large-scale deep foundation pit projects, to ensure a dry working environment at the bottom of the pit, a large number of dewatering wells (dozens to hundreds) are typically densely arranged inside the pit. Current technology generally adopts a 'single well, single pump, single pipe' drainage model, where each dewatering well is equipped with an independent pump, and groundwater is directly pumped to a designated discharge point outside the foundation pit via an independent drainage pipe. This single-well independent drainage system results in a pipe density of 3-5 pipes per 100 square meters within the foundation pit. The numerous independent drainage pipes crisscross and intertwine within the foundation pit, occupying a significant amount of working space. This not only leads to a chaotic construction site but also severely hinders the passage of construction machinery and personnel operations, increasing safety risks such as tripping and collisions. Furthermore, pipe inspection and maintenance are extremely difficult. Since each drainage pipe needs to extend from the bottom of the pit to the top or even further to a discharge point, the pipe length can easily reach tens to hundreds of meters. Long-distance water transport leads to a significant increase in the resistance along the water flow (head loss), which increases the pump head by 30-50% and energy consumption costs by 40%, resulting in a huge waste of energy and high equipment purchase and operating costs.

[0003] For example, CN115726380A, published on March 3, 2023, discloses a foundation pit dewatering structure, including curved rods, support rods, and a water pump. Multiple curved rods and support rods are provided, interconnected to form a filter ball, which is placed inside a collection well. The support rods extend circumferentially along the filter ball, and multiple support rods are arranged radially at intervals along the filter ball. The filter ball has multiple filter holes. An opening is provided between the curved rods and the support rods, and the water pump has a pumping pipe, which passes through the opening into the inner cavity of the filter ball. In use, the aforementioned drainage structure involves numerous drainage pipes in multiple foundation pits, resulting in a complex construction environment and poor practicality. Summary of the Invention

[0004] The purpose of this invention is to provide a more practical centralized drainage device for dewatering large foundation pits based on gravity flow. This invention collects water pumped from dewatering wells and discharged through short branch pipes via a sloping main pipe. Under gravity, the water naturally drains out of the foundation pit through the main pipe, achieving rapid drainage of dewatering water. It features a simple structure, low manufacturing cost, and higher practicality.

[0005] To achieve the above objectives, the technical solution adopted by this utility model to solve its technical problem is: a centralized drainage device for dewatering in a large foundation pit based on gravity flow, comprising a foundation pit bottom and dewatering wells set in the foundation pit bottom, a support is provided in the foundation pit bottom, a main pipe is provided on the support, the main pipe is sloped, a water pump is provided in the dewatering well, and the water pump is connected to the main pipe through a short branch pipe.

[0006] The main pipe is connected to the short branch pipe via a branch connector.

[0007] The short branch pipe is equipped with a filter assembly.

[0008] The connection between the main pipe and the branch connector is located on the upper side of the main pipe.

[0009] The branch connector is a tee, which is connected to the main pipe and the short branch pipe.

[0010] A water collection pit is provided at one end of the main pipe that extends outside the foundation pit.

[0011] The filtering component is a filter screen.

[0012] The support is equipped with a pipe rack that connects to the branch connector.

[0013] The beneficial effects of this utility model are:

[0014] The water pump works to transport water from the dewatering well to the main pipe through a short branch pipe. Relying on the potential energy generated by the slope of the pipe, it overcomes the friction resistance along the way and flows naturally to and is discharged outside the foundation pit, thereby realizing the rapid discharge of dewatering in the foundation pit. It replaces the traditional high-energy consumption mode that relies on each water pump to overcome the resistance of ultra-long pipes. It has a simple structure, low manufacturing cost, and higher practicality.

[0015] The short branch pipe is equipped with a filter assembly to filter out impurities in the water entering the main pipe and prevent blockage. A water collection pit is provided at the end of the main pipe that extends outside the foundation pit to collect water, which facilitates subsequent water collection and discharge and prevents water discharged from the main pipe from spreading and damaging the construction environment. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the centralized drainage device for dewatering in large foundation pits based on gravity flow, which is a feature of this invention.

[0017] Figure 2 This is a partial structural diagram of the connection between the main pipe and branch connectors.

[0018] In the attached diagram: 1-Pit bottom, 2-Dewatering well, 3-Support, 4-Main pipe, 5-Water pump, 6-Short branch pipe, 7-Branch connector, 8-Sump pit, 9-Filter screen, 10-Pipe rack. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0020] The specific implementation of this utility model will be described in detail below with reference to specific embodiments.

[0021] like Figure 1 As shown, the structure includes a foundation pit 1 and dewatering wells 2 located within the foundation pit 1. A support 3 is installed within the foundation pit 1, and a main pipe 4 is mounted on the support 3. The main pipe 4 has a slope. A water pump 5 is installed within the dewatering well 2, and the water pump 5 is connected to the main pipe 4 via a short branch pipe 6. In this embodiment, the diameter of the main pipe 4 is much larger than the diameter of the drainage pipe of the water pump 5 in a single dewatering well 2. Specifically, the diameter of the main pipe 4 is 5-10 times or greater than the diameter of the drainage pipe, depending on the number of manifolds and the design flow rate. The main pipe 4 has a preset, continuous downward slope. The materials of the main pipe 4 and the short branch pipe 6 must meet the requirements of strength, pressure resistance, and corrosion resistance, such as HDPE pipe or steel pipe. In this embodiment, the materials of the main pipe 4 and the short branch pipe 6 are HDPE pipe.

[0022] In use, a main pipe 4 with a continuous downward slope is planned and laid in the foundation pit. The low-end outlet of the main pipe 4 leads to the outside of the foundation pit. The water pumps 5 of each dewatering well 2 are connected to the main pipe 4 through short branch pipes 6. The water pumps 5 in each dewatering well 2 are started to pump groundwater into the short branch pipes 6. The water flow in each short branch pipe 6 flows into the main pipe 4. Under the action of gravity, the water flow into the main pipe 4 overcomes the friction resistance by relying on the potential energy generated by the slope of the pipe and flows naturally to the outside of the foundation pit, thereby realizing the rapid discharge of dewatering in the foundation pit. This replaces the traditional high-energy consumption mode that relies on each water pump to overcome the resistance of ultra-long pipes. The structure is simple, the manufacturing cost is low, and the practicality is higher.

[0023] The main pipe 4 is connected to the short branch pipe 6 through the branch connector 7, thereby ensuring a stable connection between the main pipe 7 and the short branch pipe 6.

[0024] A filter assembly is installed on the short branch pipe 6 to filter out impurities in the water entering the main pipe 4 and prevent the main pipe 4 from becoming blocked. Furthermore, a filter assembly is installed at the inlet of the water pump 5 to prevent the short branch pipe 6 from becoming blocked.

[0025] The short branch pipe 6 has a connection point with the branch connector 7 located on the upper side of the main pipe 4, thereby ensuring that the water flowing out of the short branch pipe 6 falls stably into the main pipe 4 under the action of gravity for drainage.

[0026] Branch connector 7 is a tee, which connects to the main pipe 4 and the short branch pipe 6. The tee achieves a stable connection between the main pipe 4 and the short branch pipe 6. Specifically, the tee is connected to the main pipe 4 and the short branch pipe 6 by adhesive.

[0027] A water collection pit 8 is provided at one end of the main pipe 4 that extends outside the foundation pit. Water is collected through the water collection pit 8 to facilitate subsequent water collection and discharge, and to prevent water discharged from the main pipe 4 from spreading and causing damage to the construction environment.

[0028] The filter assembly is a filter screen 9, which removes impurities from the water discharged from the short branch pipe 6.

[0029] The support 3 is equipped with a pipe rack 10 that connects to the branch connector 7. The branch connector 7 is supported by the pipe rack 10, thereby ensuring that the connection between the main pipe 4 and the short branch pipe 6 is stably supported, thus ensuring the normal operation of drainage.

[0030] In summary, the beneficial effects of this application;

[0031] Significantly shortened short branch pipes 6: The substantial reduction in branch pipe length (from tens / hundreds of meters to tens of meters) is the direct and quantifiable structural change and source of advantage brought about by this scheme.

[0032] Significantly reduced head loss and energy consumption: Due to the greatly shortened length of the short branch pipes for drainage from each pump (typically reduced by 70%-90%), and the reliance on gravity flow in the main pipe, the overall head loss of the system is significantly reduced. Under the same drainage requirements, pumps with smaller power (lower head) can be selected, which is expected to save more than 20%-40% of pump energy consumption.

[0033] Optimize site layout and improve safety: The number of messy long drainage pipes in the foundation pit has been drastically reduced (only 6 short branch pipes and a small number of main pipes 4 remain), freeing up site space, making construction passages unobstructed, greatly reducing safety risks such as tripping and collisions caused by messy pipelines, and facilitating construction management and equipment passage.

[0034] Simplified management and maintenance: Centralized layout of main pipelines facilitates inspection and maintenance. Branch pipe faults have a smaller impact area and are easier to locate and repair.

[0035] Cost reduction: Reduce the use of small-diameter pipes over long distances; reduce pump purchase and operating costs; and potentially reduce on-site management and coordination costs.

[0036] 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 centralized drainage device for large foundation pit in-pit precipitation based on gravity self-flow, comprising a foundation pit low (1) and a precipitation well (2) arranged in the foundation pit low (1), a support (3) is arranged in the foundation pit low (1), characterized in that, The support (3) is provided with a main pipe (4), the main pipe (4) is sloped, the dewatering well (2) is provided with a water pump (5), and the water pump (5) is connected to the main pipe (4) through a short branch pipe (6).

2. The gravity-based centralized drainage device for large foundation pit in-pit dewatering according to claim 1, characterized in that, The main pipe (4) is connected to the short branch pipe (6) through the branch connector (7).

3. The gravity-based centralized drainage device for large foundation pit in-pit dewatering according to claim 2, characterized in that, The short branch pipe (6) is equipped with a filter assembly.

4. The gravity-based centralized drainage device for large foundation pit in-pit dewatering according to any one of claims 2-3, characterized in that, The connection between the main pipe (4) and the branch connector (7) is located on the upper side of the main pipe (4).

5. The gravity-based centralized drainage device for large foundation pit in-pit dewatering according to claim 4, characterized in that, The branch connector (7) is a tee, which is connected to the main pipe (4) and the short branch pipe (6).

6. The gravity-based centralized drainage device for large foundation pit in-pit dewatering according to claim 4, characterized in that, The main pipe (4) has a water collection pit (8) at one end extending outside the foundation pit.

7. The gravity-based centralized drainage device for large foundation pit in-pit dewatering according to claim 3, characterized in that, The filtering component is a filter screen (9).

8. The gravity-based centralized drainage device for large foundation pit in-pit dewatering according to claim 3, characterized in that, The bracket (3) is provided with a pipe rack (10) that is connected to the branch connector (7).

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