Water collecting pit structure meeting quicksand and underground water
By using pumping pipes, sump support structures, and gravel filling layers in municipal construction, the construction difficulties caused by the surface perched water layer were solved, enabling timely drainage of groundwater and construction stability, thus ensuring construction quality and schedule.
Patent Information
- Application Number
- CN202422763364.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-13
- Publication Date
- 2025-10-31
- Estimated Expiration
- 2034-11-13
AI Technical Summary
When municipal pipeline construction encounters a stagnant water layer, it causes construction difficulties, especially when there is a deep sump under the structural base slab, making it difficult to deal with groundwater issues and affecting construction quality and schedule.
A pumping pipe is installed through the perched water layer, and a seamless cylindrical sump support structure is installed inside the sump. The pumping pipe is connected to the sump support structure, which serves as the support for the structural base. Combined with a gravel filling layer and a water trough design, it prevents floating and ensures timely drainage of groundwater and construction stability.
The timely drainage of groundwater ensured that there was no water accumulation on the construction surface, improved construction efficiency and structural stability, and ensured the smooth progress of subsequent procedures.
Smart Images
Figure CN223497206U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of sump pits, and more particularly to a sump pit structure that encounters quicksand and groundwater. Background Technology
[0002] With the rapid development of urban construction, the requirements for the quality and schedule of municipal pipeline construction are becoming increasingly stringent. Municipal pipeline construction often presents challenges such as complex geological conditions and the difficulty in avoiding groundwater issues. When excavating manholes for municipal pipelines to the foundation elevation, surface water layers may be encountered, affecting the construction of the structural base slab. Furthermore, when a sump pit deeper than the structural base slab is located beneath it, construction becomes even more difficult. Utility Model Content
[0003] In order to promptly pump out groundwater when encountering perched water layers and reduce construction difficulty, this application provides a water collection pit structure for encountering quicksand and groundwater.
[0004] The technical solution for a water collection pit structure encountering quicksand and groundwater provided in this application is as follows:
[0005] A sump structure for encountering quicksand and groundwater includes at least one pumping pipe extending into a perched aquifer. Each pumping pipe is equipped with a water pump to extract water from the perched aquifer. The sump structure also includes a sump support structure located within the sump formed by excavation from the pumping pipe towards the edge. The sump support structure is a seamless cylindrical enclosure, and the pumping pipe, the sump support structure, and the internal space of the sump are connected. The sump support structure provides support for the structural base plate.
[0006] By adopting the above technical solution, when the foundation pit is excavated to the water-permeable layer, at least one water pumping pipe is inserted into the water-permeable layer to effectively and timely pump out the groundwater, ensuring that there is no water accumulation on the working surface. Then, a sump pit is excavated to the outer edge of the water pumping pipe, and a sump pit support structure is placed in the sump pit as a support structure for the structural base plate, so that subsequent processes, such as pouring the foundation concrete and making the waterproof layer, can be carried out smoothly.
[0007] Preferably, the sump is designed as a frustum with a diameter that gradually decreases from the side closer to the foundation pit to the side farther away from the foundation pit, and the axes of the sump support structure and the pumping pipe are both parallel to the axis of the sump.
[0008] By adopting the above technical solution, and designing the water collection pit as a frustum with a gradually decreasing opening, it is beneficial to improve structural stability and to collect water.
[0009] Preferably, the support structure of the sump is a concrete masonry trench or a prefabricated trench formed by enclosing it with metal plates.
[0010] By adopting the above technical solution, the prefabricated pit formed by enclosing metal plates helps to shorten construction time and improve construction efficiency.
[0011] Preferably, the sump support structure is a precast pit formed by enclosing steel plates. The inner wall of the precast pit is fixed with reinforcing ribs. Multiple reinforcing ribs are arranged around the circumference of the precast pit, and each reinforcing rib extends along the axis of the precast pit.
[0012] By adopting the above technical solution, reinforcing ribs are set inside the sump support structure to improve the strength and support performance of the sump support structure.
[0013] Preferably, the bottom of the sump is covered with a gravel filling layer, the pumping pipe and the sump support structure are buried in the gravel filling layer, and after the gravel filling layer is laid, the pumping pipe is connected to the internal space of the sump.
[0014] By adopting the above technical solution, a crushed stone filling layer is laid at the bottom of the sump to ensure the supporting strength of the sump for the sump support structure. After the crushed stone filling layer is laid, the pumping pipe is still connected to the space inside the sump, so as to ensure that the groundwater can be smoothly collected into the temporary pumping pipe after the crushed stone is backfilled, which is convenient for subsequent construction.
[0015] Preferably, a concrete pad or a water trough is provided on the upper surface of the crushed stone filling layer, the water trough being a cylindrical shape formed by enclosing steel plates, and a first counterweight is provided inside the water trough.
[0016] By adopting the above technical solutions, if the groundwater outflow is small, a 5-10cm thick concrete cushion layer can be poured on the gravel filling layer. If the groundwater outflow is large and there is no time to pour the cushion layer, masonry, and plastering, a water trough can be made in advance using steel plates. To prevent it from floating, a first counterweight should be filled inside. The first counterweight can also force the gravel filling layer below to be compacted.
[0017] Preferably, the size of the water tank is 20-40cm larger than the outer contour of the water collection pit support structure.
[0018] By adopting the above technical solution, even if deviations occur during the placement of the sump support structure, the position of the sump support structure can still be guaranteed to meet the design requirements.
[0019] Preferably, the interior of the water tank is provided with a detachable temporary support, which is located close to the inner wall of the water tank.
[0020] By adopting the above technical solution and setting temporary supports inside the water tank, deformation can be prevented during the backfilling of crushed stone.
[0021] Preferably, a second counterweight is welded to the side wall of the water tank, the second counterweight being used to prevent the water tank from floating after the first counterweight is removed.
[0022] By adopting the above technical solution, it is ensured that the water tank will not float after the backfill around the water tank is completed and the internal counterweight is removed.
[0023] Preferably, the second counterweight is a steel profile or steel plate welded to the outer wall of the water tank.
[0024] By adopting the above technical solution, which involves welding steel sections or plates to the outer wall of the water tank, processing is facilitated and costs are saved.
[0025] In summary, this application includes at least one of the following beneficial technical effects:
[0026] 1. This application first uses a pumping pipe to pump out the water from the perched layer at the bottom of the foundation pit when excavating to the perched layer, and then excavates a sump pit. By setting up a sump pit support structure in the sump pit, the stability of the sump pit is ensured. The water from the perched layer seeps into the sump pit through the side wall of the sump pit. The pumping pipe is connected to the space inside the sump pit, so that the water in the sump pit can continue to be pumped out through the pumping pipe. In addition, the sump pit support structure can serve as a support structure for the structural base plate, which facilitates the construction of subsequent processes.
[0027] 2. By setting a first counterweight and a second counterweight inside the water tank, the water tank is prevented from floating.
[0028] 3. By fixing reinforcing ribs to the inner wall of the sump support structure, the strength and support performance of the sump support structure can be improved. Attached Figure Description
[0029] Figure 1 This is a schematic diagram of a water collection pit structure for encountering quicksand and groundwater according to this utility model.
[0030] Figure 2 This is a schematic diagram of the structure after the sump pit is backfilled with crushed stone following the completion of construction.
[0031] Explanation of reference numerals in the attached drawings: 01, foundation pit; 02, perched water layer; 03, structural base slab; 1, pumping pipe; 2, sump; 3, sump support structure; 4, gravel filling layer; 5, water trough. Detailed Implementation
[0032] The following is in conjunction with the appendix Figure 1-2 This application will be described in further detail.
[0033] This application discloses a water collection pit structure for encountering quicksand and groundwater. (Refer to...) Figures 1-2The sump structure for encountering quicksand and groundwater includes at least one pumping pipe 1 extending into the perched layer 02. Each pumping pipe 1 is equipped with a water pump to extract water from the perched layer 02. The sump structure also includes a sump support structure 3 installed within the sump 2 formed by excavation from the pumping pipe 1 towards the edge. The sump support structure 3 is a seamless cylindrical enclosure, and the pumping pipe 1 and the sump support structure 3 are connected to the internal space of the sump 2. The pumping pipe 1 is used to promptly pump out the water from the perched layer 02, causing the water level in the perched layer 02 to drop to a certain elevation. Then, the sump 2 is gradually excavated from the pumping pipe 1 towards the outer edge. The diameter of the sump 2 is set according to the diameter of the structural base plate 03, and generally, the diameter of the sump 2 is consistent with the diameter of the structural base plate 03. In this way, water from the perched water layer 02 can penetrate through the side wall of the sump 2 and seep into the interior of the sump 2, where it accumulates. The water accumulated in the sump 2 is then discharged through the pumping pipe 1, facilitating subsequent construction. The sump support structure 3 is installed inside the sump 2 to provide support for the structural base slab 03.
[0034] The sump pit 2 is designed as a frustum shape with a diameter that gradually decreases from the side closer to the foundation pit 01 to the side farther away from the foundation pit 01. The axes of the sump pit support structure 3 and the pumping pipe 1 are both parallel to the axis of the sump pit 2.
[0035] After the excavation of the sump 2 is completed, before placing the sump support structure 3 inside the sump 2, it is necessary to backfill the sump 2 with crushed stone to form a crushed stone filling layer 4 inside the sump 2. After the crushed stone filling layer 4 is laid, the pumping pipe 1 is connected to the internal space of the sump 2 to ensure that the groundwater can be smoothly collected into the temporary pumping pipe 1 after the crushed stone is backfilled, which facilitates subsequent construction.
[0036] A concrete pad or a water trough 5 is installed on the upper surface of the crushed stone filling layer 4. This needs to be determined based on the actual water outflow from the sump 2: if the groundwater outflow is small, a 5-10cm thick concrete pad can be poured on top of the crushed stone filling layer 4; if the groundwater outflow is large and there is no time to pour the pad, build the masonry, or plaster, a water trough 5 can be prefabricated using steel plates. The water trough 5 is a cylindrical shape formed by enclosing steel plates, and a first counterweight is installed inside the water trough 5 to prevent it from floating. The first counterweight also forces the crushed stone filling layer 4 below to compact. The first counterweight can be placed in the water trough 5 by placing sandbags or filling it with water, prioritizing those that are easy to remove. Before placing the water trough 5, the filled crushed stone should be compacted and leveled. If the water outflow is large and cannot be pumped out in time, the water trough 5 should be leveled underwater using an excavator and gently pressed down. After the water trough 5 is in place, the counterweight should be increased appropriately.
[0037] The dimensions of the water tank 5 are 20-40cm larger than the outer contour of the sump support structure 3. This ensures that even if there is a deviation during the placement of the sump support structure 3, the position of the sump support structure 3 still meets the design requirements.
[0038] A second counterweight is welded to the side wall of the water tank 5. This second counterweight is used to prevent the water tank 5 from floating after the first counterweight is removed. In this application, the second counterweight is a steel profile or steel plate welded to the outer wall of the water tank 5, and multiple steel profiles or steel plates are spaced apart around the circumference of the water tank 5. This ensures that the water tank 5 will not float even after the surrounding backfill is completed and the internal counterweight is removed.
[0039] The sump support structure 3 can be a concrete masonry trench or a precast trench enclosed by metal plates. To save construction time, in this application, the sump support structure 3 is a precast trench enclosed by steel plates. Furthermore, the inner wall of the precast trench is fixed with reinforcing ribs (not shown in the figure) to improve the strength and support performance of the sump support structure 3. Preferably, multiple reinforcing ribs are arranged circumferentially around the precast trench, and each reinforcing rib extends along the axis of the precast trench.
[0040] After the second water collection pit is placed, continue to backfill the second water collection pit with crushed stone to the elevation, and then proceed with the subsequent construction.
[0041] The implementation principle of a sump structure for encountering quicksand and groundwater in this application embodiment is as follows: First, the foundation pit 01 is excavated normally. When the excavation reaches the bottom of the foundation pit 01 and a surface water layer 02 appears, the excavation is stopped. Then, a pumping pit with a diameter smaller than the size of the foundation pit 01 is excavated at the bottom of the foundation pit 01, and a pumping pipe 1 is installed in the pumping pit. A water pump is installed in the pumping pipe 1 to lower the water level of the surface water layer 02 to the required elevation. Then, a sump 2 is excavated outward from the pumping pit to form a sump 2. The size of the sump 2 is smaller than the size of the foundation pit 01 and approximately the same as the size of the structural base slab 03. Then, crushed stone is backfilled at the bottom of the sump 2 to form a crushed stone backfill layer. The pumping pipe 1 is buried in the crushed stone backfill layer and is connected to the internal space of the sump 2. Then, a water trough 5 is set up in the water collection pit 2 and a water collection pit support structure 3 is placed thereto, so that the water in the surface water layer 02 can be drained in time during construction, so that subsequent procedures, such as pouring the foundation concrete and making the waterproof layer, can be carried out smoothly.
[0042] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.
Claims
1. A water collection pit structure for encountering quicksand and groundwater, characterized in that: The structure includes at least one pumping pipe (1) extending into the perched water layer (02), and each pumping pipe (1) is equipped with a water pump for pumping out water from the perched water layer (02). The sump structure for encountering quicksand and groundwater also includes a sump support structure (3) set in the sump (2) formed by excavating from the pumping pipe (1) to the edge. The sump support structure (3) is a seamless cylindrical enclosure, and the pumping pipe (1), the sump support structure (3), and the internal space of the sump (2) are connected. The sump support structure (3) is used to provide support for the structural base plate (03).
2. The water collection pit structure for encountering quicksand and groundwater as described in claim 1, characterized in that: The water collection pit (2) is designed as a frustum with a diameter that gradually decreases from the side closer to the foundation pit (01) to the side farther away from the foundation pit (01). The axes of the water collection pit support structure (3) and the pumping pipe (1) are both parallel to the axis of the water collection pit (2).
3. The water collection pit structure for encountering quicksand and groundwater as described in claim 2, characterized in that: The water collection pit support structure (3) is a concrete masonry trench or a prefabricated pit formed by enclosing it with metal plates.
4. The water collection pit structure for encountering quicksand and groundwater as described in claim 3, characterized in that: The water collection pit support structure (3) is a precast pit formed by enclosing steel plates. The inner wall of the precast pit is fixed with reinforcing ribs. Multiple reinforcing ribs are arranged around the circumference of the precast pit, and each reinforcing rib extends along the axis of the precast pit.
5. The water collection pit structure for encountering quicksand and groundwater as described in claim 1, characterized in that: The bottom of the water collection pit (2) is covered with a gravel filling layer (4), the water pumping pipe (1) and the water collection pit support structure (3) are buried in the gravel filling layer (4), and after the gravel filling layer (4) is laid, the water pumping pipe (1) is connected to the internal space of the water collection pit (2).
6. The water collection pit structure for encountering quicksand and groundwater as described in claim 5, characterized in that: The upper surface of the crushed stone filling layer (4) is provided with a concrete pad or a water tank (5), the water tank (5) is a cylindrical shape formed by steel plates, and a first counterweight is provided inside the water tank (5).
7. The water collection pit structure for encountering quicksand and groundwater as described in claim 6, characterized in that: The dimensions of the water tank (5) are 20-40cm larger than the outer contour of the water collection pit (2).
8. The water collection pit structure for encountering quicksand and groundwater as described in claim 6, characterized in that: The water tank (5) is provided with a detachable temporary support inside, which is located close to the inner wall of the water tank (5).
9. The water collection pit structure for encountering quicksand and groundwater as described in claim 6, characterized in that: A second counterweight is welded to the side wall of the water tank (5), which is used to prevent the water tank (5) from floating after the first counterweight is removed.
10. The water collection pit structure for encountering quicksand and groundwater according to claim 9, characterized in that: The second counterweight is a steel profile or steel plate welded to the outer wall of the water tank (5).