Foundation pit dewatering and drainage formwork device

Abstract

The utility model discloses a foundation pit dewatering and drainage template device which is characterized in that a drainage pile and a fixed pile are vertically driven at intervals, a vertical channel is vertically arranged in the center of the drainage pile, a vertical drainage pipeline is arranged in the vertical channel, the top end of the vertical drainage pipeline is fixedly connected with a transverse drainage pipeline, and a drainage pipeline socket is fixedly connected with a transverse main drainage pipeline. The transverse main drainage pipeline is fixedly connected with the main drainage pipe, underground water is subjected to secondary filtration, enters the main drainage pipe through the vertical drainage pipeline and the transverse drainage pipeline and is drained out of the foundation pit construction range, the water suction pump continuously works to gradually pump away the underground water and lower the underground water level, and the foundation pit dewatering and drainage effect is achieved; and the engineering construction cost is reduced.

Description

A foundation pit dewatering formwork device Technical Field

[0001] This utility model patent belongs to the field of foundation pit dewatering technology, and in particular relates to a foundation pit dewatering template device. Background Technology

[0002] Dewatering is a key process in foundation pit construction. To ensure the safety and stability of foundation pit construction, it is necessary to take necessary technical measures to reduce water inflow into the foundation pit, such as using open drainage, wellpoint dewatering, and pipe well dewatering.

[0003] CN117166502A proposes a method for constructing dewatering pits, comprising the following steps: leveling and compacting the site; determining the location of drainage wells; constructing dewatering wells; each well includes an outer steel casing and an inner steel filter pipe, with the outer steel casing having external filter holes and the inner steel filter pipe having internal filter holes; driving the outer steel casing into the soil; filling the outer steel casing with bottom filler; inserting the inner steel filter pipe into the bottom filler; filling the space between the inner and outer steel casings with filter filler; placing a pump; removing the inner steel filter pipe and the outer steel casing; backfilling and compacting the well hole left after removing the outer steel casing. This method reduces the risk of well wall collapse when excavating wells in areas with poor soil cohesion and high groundwater levels, ensuring smooth well excavation.

[0004] Among existing technologies, well dewatering is a widely used dewatering technique applied to soils with high permeability and high groundwater levels or pressures. The construction of well dewatering generally includes the following steps: excavating a well using a drilling rig; placing a filter pipe inside the well, with numerous through holes running through its center; filling the gap between the outer surface of the filter pipe and the inner wall of the well with stones; placing a pump inside the filter pipe for dewatering; and sealing the well with cement grout after the main structure is completed. However, well dewatering is a complex process, thus requiring the development of a foundation pit dewatering device suitable for various soil layers, with a simple structure and easy operation. In particular, a device that is easy to construct and reusable would offer greater economic and social benefits to construction companies. Summary of the Invention

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a foundation pit dewatering formwork device, including a pre-dewatering ground, drainage piles, fixed piles, baffles, and a drainage system. The drainage piles include seepage holes, filter screen B, vertical channels, drainage pile steel casings, baffle slots, filter screen A, connecting plates, drainage troughs, water-collecting inclined plates, and layered drainage units. The drainage system includes a vertical drainage system, vertical drainage pipes, horizontal drainage pipes, drainage pipe connectors, a horizontal main drainage pipe, drainage pipe inlets, a main drainage pipe, and a water pump. Vertical intervals are provided on the pre-dewatering ground. Drainage piles and fixing piles are driven in. Vertical baffle slots are set inside adjacent sides of the drainage piles and fixing piles. Baffles are vertically movable between the baffle slots of adjacent drainage piles and fixing piles. A vertical channel is set in the center of the drainage pile. A vertical drainage pipe is installed in the vertical channel. The top of the vertical drainage pipe is fixedly connected to the horizontal drainage pipe. A drainage pipe plug is set at the other end of the horizontal drainage pipe. The drainage pipe plug is movably connected to the drainage pipe socket. The drainage pipe socket is fixedly connected to the horizontal main drainage pipe. The horizontal main drainage pipe is fixedly connected to the main drainage pipe. A water pump is installed in the middle of the main drainage pipe.

[0006] As a further embodiment of this utility model: a steel casing is provided on the outside of the drainage pile, and a multi-layered drainage unit is provided at the bottom of the drainage pile. Multiple sets of seepage holes are provided around the steel casing of the drainage pile in the layered drainage unit. A filter screen B is provided on the outside of the seepage holes. Three sets of connecting plates are provided in each layered drainage unit. The connecting plates are respectively connected to the steel casing of the drainage pile and the outer wall of the vertical channel. A water-collecting inclined plate and a drainage trough are provided between adjacent connecting plates. A filter screen A is installed between the water-collecting inclined plate and the drainage trough. The aperture size of the filter screen A is half the aperture size of the filter screen B.

[0007] As a further embodiment of this utility model: the diameter of the drainage pile and the fixed pile is 800mm, the vertical spacing between the drainage pile and the fixed pile is 2-3m, and the dimensions of the baffle slot are 150mm long and 100mm wide.

[0008] As a further aspect of this utility model: the net circumferential distance between the seepage holes is 5cm, and the net vertical distance is 5cm.

[0009] Compared with existing technologies, this utility model has the following advantages: A foundation pit dewatering formwork device allows groundwater to enter the water collection inclined plate through the circumferential seepage holes of the drainage pile steel casing of the layered drainage unit. After secondary filtration, the groundwater flows into the vertical channel. The groundwater then enters the horizontal main drainage pipe through the vertical drainage pipe and the horizontal drainage pipe, and then enters the main drainage pipe to be discharged from the foundation pit construction area. The water pump works continuously to gradually pump away the groundwater and lower the groundwater level, achieving the purpose of foundation pit dewatering. At the same time, this device can be reused, reducing engineering construction costs. Attached Figure Description

[0010] Figure 1 is a plan view of this utility model.

[0011] Figure 2 is a front view of this utility model.

[0012] Figure 3 is a side view of this utility model.

[0013] Figure 4 is a side view of section AA in Figure 1.

[0014] Figure 5 is a top view of this utility model.

[0015] Figure 6 is a top view of section BB in Figure 1.

[0016] Figure 7 is a top view of the CC section in Figure 1.

[0017] Figure 8 is a magnified view of part D in Figure 2.

[0018] Figure 9 is a magnified view of part E in Figure 4.

[0019] Figure 10 is a magnified view of part F in Figure 1.

[0020] Explanation of reference numerals in the attached drawings: 1. Pre-lowered drainage ground; 2. Drainage pile; 3. Fixed pile; 4. Baffle; 5. Seepage hole; 6. Vertical channel; 7. Vertical drainage system; 71. Vertical drainage pipe; 72. Horizontal drainage pipe; 73. Drainage pipe plug; 8. Horizontal main drainage pipe; 9. Drainage pipe socket; 10. Main drainage pipe; 11. Water pump; 12. Drainage pile steel casing; 13. Baffle slot; 14. Filter screen A; 15. Connecting plate; 16. Drainage trough; 17. Water collection inclined plate; 18. Layered drainage unit; 19. Filter screen B. Detailed Implementation

[0021] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.

[0022] In this utility model, when directions (up, down, left, right, front, and back) are described, it is only for the convenience of describing the technical solution of this utility model, and does not indicate or imply that the technical features referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this utility model.

[0023] In this invention, unless otherwise explicitly defined, terms such as "set," "install," and "connect" should be interpreted broadly. For example, they can refer to direct connection or indirect connection through an intermediate medium; they can refer to fixed connection, detachable connection, or integral molding; they can refer to mechanical connection. Those skilled in the art can reasonably determine the specific meaning of the above terms in this invention based on the specific content of the technical solution.

[0024] As shown in Figure 1-10, a foundation pit dewatering formwork device includes a pre-dewatering ground surface 1, drainage piles 2, fixed piles 3, baffles 4, and a drainage system. The drainage piles 2 include seepage holes 5, filter screens B19, vertical channels 6, drainage pile steel casings 12, baffle slots 13, filter screens A14, connecting plates 15, drainage channels 16, water collection inclined plates 17, and layered drainage units 18. The drainage system includes a vertical drainage system 7, vertical drainage pipes 71, horizontal drainage pipes 72, drainage pipe connectors 73, a horizontal main drainage pipe 8, drainage pipe inlets 9, a main drainage pipe 10, and a water pump 11. Drainage piles 2 are vertically driven at intervals into the pre-dewatering ground surface 1. The fixed pile 3, drainage pile 2 and fixed pile 3 are vertically equipped with baffle slots 13 on both sides. The baffle slots 13 of the adjacent drainage pile 2 and fixed pile 3 are vertically movable and installed with baffles 4. The drainage pile 2 is vertically equipped with a vertical channel 6 in the center. The vertical channel 6 is equipped with a vertical drainage pipe 71. The top of the vertical drainage pipe 71 is fixedly connected to the horizontal drainage pipe 72. The other end of the horizontal drainage pipe 72 is equipped with a drainage pipe plug 73. The drainage pipe plug 73 is movably connected to the drainage pipe socket 9. The drainage pipe socket 9 is fixedly connected to the horizontal main drainage pipe 8. The horizontal main drainage pipe 8 is fixedly connected to the main drainage pipe 10. A water pump 11 is installed in the middle of the main drainage pipe 10.

[0025] As a further embodiment of this utility model: a drainage pile steel casing 12 is provided on the outside of the drainage pile 2, and a multi-group layered drainage unit 18 is provided at the bottom of the drainage pile 2. The drainage pile steel casing 12 of the layered drainage unit 18 is provided with multiple groups of seepage holes 5 around its circumference. A filter screen B19 is provided on the outside of the seepage holes 5. Three sets of connecting plates 15 are provided in each layered drainage unit 18. The connecting plates 15 are respectively connected to the drainage pile steel casing 12 and the outer wall of the vertical channel 6. A water-collecting inclined plate 17 and a drainage trough 16 are provided between adjacent connecting plates 15. A filter screen A14 is installed between the water-collecting inclined plate 17 and the drainage trough 16. The aperture size of the filter screen A14 is half the aperture size of the filter screen B19.

[0026] As a further embodiment of this utility model: the drainage pile 2 and the fixed pile 3 have a diameter of 800mm, the vertical spacing between the drainage pile 2 and the fixed pile 3 is 2-3m, and the baffle slot 13 has a length of 150mm and a width of 100mm.

[0027] As a further aspect of this utility model: the net circumferential distance between the seepage holes 5 and the net vertical distance between them is 5cm.

[0028] Working principle: On the pre-lowered drainage ground, the center points of drainage pile 2 and fixed pile 3 are marked out according to the outer edge of the foundation pit design dimensions. The drainage pile 2 and fixed pile 3 are marked out with a net distance of 2m in the upstream direction of the groundwater and a net distance of 3m in the downstream direction of the groundwater. The pile lengths of drainage pile 2 and fixed pile 3 are selected according to the depth of the groundwater layer and the excavation depth of the foundation pit. It is required that the length of drainage pile 2 is greater than the excavation depth of the foundation pit and that the layered drainage unit is below the groundwater layer. The length of fixed pile 3 is required to be greater than the excavation depth of the foundation pit.

[0029] A pile driver was used to drive drainage piles 2 and fixed piles 3 into the perimeter of the foundation pit at intervals according to the layout position. Soil was excavated in the foundation pit. A crane was used to lift the first baffle 4 into the baffle slot 13 between the drainage pile 2 and the fixed pile 3. As the excavation depth increased, the second baffle 4 and the third baffle 4 were gradually lifted into the baffle slot 13 between the drainage pile 2 and the fixed pile 3. When the groundwater layer was reached, polyethylene mortar was filled between the first and second baffles 4 to ensure that there was no water leakage.

[0030] Groundwater enters the water collection inclined plate 17 inside the layered drainage unit 18 through the circumferential seepage holes 5 of the drainage pile steel casing 12. Large-diameter soil particles in the water are left outside the seepage holes 5 by the filter screen B19. When fine particles in the water pass through the filter screen A14 between the water collection inclined plate 17 and the drainage channel 16, they undergo a second filtration. The groundwater then flows into the vertical channel of the drainage pile 2.

[0031] Install the vertical drainage pipe 71 into the vertical channel 6, connect the horizontal drainage pipe 72 to the vertical drainage pipe 71, then connect the drainage pipe plug 73 to the drainage pipe socket 9, connect the drainage pipe socket 9 to the horizontal main drainage pipe 8, connect the horizontal main drainage pipe 8 to the main drainage pipe, start the water pump 11, and the groundwater in the vertical channel 6 of the drainage pile 2 enters the horizontal main drainage pipe 8 through the vertical drainage pipe 71 and the horizontal drainage pipe 72, and then enters the main drainage pipe 10 to be discharged from the foundation pit construction area. The water pump 11 continues to work to gradually pump away the groundwater, achieving the function of foundation pit dewatering.

[0032] The foundation pit excavation operation continued. After the foundation pit operation was completed, the baffle 4 was gradually lifted out of the foundation pit using a crane. Then, the drainage pile 2 and the fixing pile 3 were pulled out to complete the foundation pit drainage formwork device process.

[0033] The above is a detailed description of the preferred embodiments of the present utility model. However, the present utility model is not limited to the above embodiments. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present utility model. All such equivalent modifications or substitutions are included within the scope defined by the claims of this application.

Claims

1. A formwork device for foundation pit dewatering, characterized in that... The system includes a pre-lowered drainage surface (1), drainage piles (2), fixed piles (3), baffles (4), and a drainage system. The drainage piles (2) include seepage holes (5), a filter screen B (19), a vertical channel (6), a drainage pile steel casing (12), a baffle slot (13), a filter screen A (14), a connecting plate (15), a drainage trough (16), a water collection inclined plate (17), and a layered drainage unit (18). The drainage system includes a vertical drainage system (7), a vertical drainage pipe (71), a horizontal drainage pipe (72), a drainage pipe plug (73), a horizontal main drainage pipe (8), a drainage pipe inlet (9), a main drainage pipe (10), and a water pump (11). Drainage piles (2) and fixed piles (3) are driven vertically at intervals into the pre-lowered drainage surface (1) to drain water. A baffle slot (13) is vertically installed inside the adjacent sides of the water pile (2) and the fixed pile (3). A baffle (4) is vertically installed between the baffle slots (13) of the adjacent drainage pile (2) and the fixed pile (3). A vertical channel (6) is vertically installed in the center of the drainage pile (2). A vertical drainage pipe (71) is installed in the vertical channel (6). The top of the vertical drainage pipe (71) is fixedly connected to the horizontal drainage pipe (72). A drainage pipe plug (73) is installed at the other end of the horizontal drainage pipe (72). The drainage pipe plug (73) is movably connected to the drainage pipe socket (9). The drainage pipe socket (9) is fixedly connected to the horizontal main drainage pipe (8). The horizontal main drainage pipe (8) is fixedly connected to the main drainage pipe (10). A water pump (11) is installed in the middle of the main drainage pipe (10).

2. The foundation pit dewatering formwork device according to claim 1, characterized in that... A drainage pile steel casing (12) is installed on the outside of the drainage pile (2). A multi-group layered drainage unit (18) is installed at the bottom of the drainage pile (2). A multi-group seepage hole (5) is installed around the drainage pile steel casing (12) of the layered drainage unit (18). A filter screen B (19) is installed on the outside of the seepage hole (5). Three sets of connecting plates (15) are installed in each layered drainage unit (18). The connecting plates (15) are connected to the drainage pile steel casing (12) and the outer wall of the vertical channel (6) respectively. A water collection inclined plate (17) and a drainage trough (16) are installed between adjacent connecting plates (15). A filter screen A (14) is installed between the water collection inclined plate (17) and the drainage trough (16). The aperture size of the filter screen A (14) is half the aperture size of the filter screen B (19).

3. A foundation pit dewatering formwork device according to claim 1, characterized in that... The drainage pile (2) and the fixed pile (3) are 800mm in diameter. The vertical spacing between the drainage pile (2) and the fixed pile (3) is 2-3m. The baffle slot (13) is 150mm long and 100mm wide.

4. A foundation pit dewatering formwork device according to claim 1, characterized in that... The net circumferential distance between the seepage holes (5) and the net vertical distance between them is 5cm.

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