Foundation pit drainage device for subway construction
By designing a foundation pit drainage device with limit rods, movable plates, counterweight boxes, and water-absorbing structures, the problem of drainage devices affecting the construction progress during rainy and snowy weather in subway construction was solved, achieving a fast and efficient drainage effect without the need for installation or disassembly.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- JIANGSU JIANGGUANG MUNICIPAL ENGINEERING CO LTD
- Filing Date
- 2025-04-30
- Publication Date
- 2026-05-01
AI Technical Summary
The existing drainage devices for subway construction pits are fixed inside the pits during rainy or snowy weather, affecting the construction progress. They also cannot be disassembled and installed in a timely manner, resulting in untimely drainage.
A foundation pit drainage device was designed, comprising a limiting rod, a movable plate, a counterweight box, and a water-absorbing structure. The counterweight box is submerged in the water to drain the water, a water pump and an extension pipe accelerate the drainage, an airbag floats on the water surface to prevent the pump from getting wet, a load-bearing rod stabilizes the movable plate, and a limiting rod prevents rotation, thus achieving rapid drainage without the need for installation or disassembly.
It enables rapid drainage without installation or disassembly in rainy or snowy weather, avoiding impacts on construction progress, improving drainage efficiency, protecting equipment, and reducing labor intensity.
Smart Images
Figure CN224186793U_ABST
Abstract
Description
A drainage device for foundation pits in subway construction Technical Field
[0001] This utility model relates to the field of drainage equipment technology, and in particular to a drainage device for foundation pits used in subway construction. Background Technology
[0002] During subway construction, it is necessary to first excavate the foundation pit. The foundation pit is located underground. During subway construction, rain and snow are inevitable. Rain and snow flowing into the foundation pit will cause water accumulation, which needs to be drained in time.
[0003] Common drainage devices are fixed inside the foundation pit regardless of whether it is raining, snowing, or normal weather. They only drain water when there is accumulation. However, fixing the drainage device inside the foundation pit will affect the construction process inside the pit. It will take time to disassemble and install it at any time. Moreover, the drainage device cannot be fixed after the construction inside the foundation pit is completed, and it cannot be guaranteed to drain water in a timely manner when water accumulates again. Summary of the Invention
[0004] This utility model addresses the problems in the prior art by providing a drainage device for subway construction pits, which is achieved through the following technical solution:
[0005] A drainage device for subway construction pits includes a limiting rod, a movable plate, a counterweight box, and a water-absorbing structure. The limiting rod is fixed to the middle of the top of the counterweight box. The movable plate is movably fitted around the outer ring of the limiting rod. The water-absorbing structure is located on the top of the movable plate. The counterweight box is a hollow box with an opening on its front side. A door is snapped into the opening of the counterweight box. Both the door and the opening of the counterweight box are fitted with sealing rings, sealing the door and the counterweight box. A counterweight block is placed inside the counterweight box. An annular airbag is fixed to the bottom of the movable plate. Further, the water-absorbing structure includes a water pump and a water-absorbing pipe. The water pump is fixedly installed on the top of the movable plate. One end of the water-absorbing pipe is connected to the inlet flange of the water pump, and the other end of the water-absorbing pipe passes through the movable plate and extends to the bottom of the movable plate. The water-absorbing pipe passes through the bottom of the movable plate where the airbag is not connected.
[0006] The present invention is further configured such that: one end of the water suction pipe that extends to the bottom of the movable plate is connected to an extension pipe that is L-shaped and rotated 90° clockwise, the short side of the extension pipe is located on one side of the counterweight box, and the water suction structure also includes a filter screen, which is installed inside the extension pipe on the side away from the water suction pipe.
[0007] The present invention is further configured such that: the water absorption structure is provided in two sets, the two sets of water absorption structures are respectively provided on both sides of the limiting rod, and the short sides of the extension tubes on both sides are respectively provided on both sides of the counterweight box.
[0008] The present invention is further configured such that: a load-bearing rod is fixedly installed at the bottom of the movable plate, the bottom of the load-bearing rod abuts against the counterweight box when the water level drops, and the height of the load-bearing rod is higher than the height of the long side of the suction pipe plus the extension pipe.
[0009] The present invention is further configured such that: the cross-section of the limiting rod is square, and the movable plate is sleeved on the outer ring of the limiting rod and cannot rotate.
[0010] The present invention is further configured such that: an inflation port is provided on the side of the airbag, and a sealing cap is snapped onto the inflation port.
[0011] In summary, the beneficial technical effects of this utility model are as follows:
[0012] When there is water accumulation in the foundation pit, the counterweight box is directly submerged in the water for drainage, eliminating the need for installation and disassembly, saving time. After the water is drained, the device can be removed directly from the foundation pit without affecting the subsequent construction progress. The airbag allows the movable plate to float on the surface of the water, preventing the water pump from getting wet and being damaged. The extension pipe ensures that the water level is below the counterweight box for drainage. The two sets of water suction structures accelerate the drainage process and improve drainage efficiency. The load-bearing rod prevents the movable plate from squeezing the airbag and extension pipe when not in use or when the water level decreases. The square cross-section of the limiting rod prevents the movable plate from rotating during use, which would hinder drainage. Attached Figure Description
[0013] Figure 1 is a structural schematic diagram illustrating the present invention in use.
[0014] Figure 2 is a structural schematic diagram showing the unused state of this utility model.
[0015] Reference numerals in the attached diagram: 1. Limiting rod; 2. Movable plate; 3. Counterweight box; 4. Water suction structure; 401. Water suction pump; 402. Water suction pipe; 403. Filter screen; 5. Box door; 6. Counterweight block; 7. Airbag; 8. Extension pipe; 9. Supporting rod; 10. Sealing cover. Detailed Implementation
[0016] The present invention will be further described in detail below with reference to the accompanying drawings.
[0017] Example
[0018] As shown in Figures 1-2, this utility model discloses a drainage device for a foundation pit in subway construction, comprising a limiting rod 1, a movable plate 2, a counterweight box 3, and a water-absorbing structure 4. The height of the limiting rod 1 is greater than the depth of the foundation pit. The limiting rod 1 is fixed at the top center of the counterweight box 3. The movable plate 2 is movably sleeved on the outer ring of the limiting rod 1. The water-absorbing structure 4 is located on the top of the movable plate 2. The counterweight box 3 is a hollow box with an opening on the front side. A door 5 is snapped into the opening of the counterweight box 3. Sealing rings are installed at both the door 5 and the opening of the counterweight box 3, and the door 5 and the counterweight box 3 are sealed together. A counterweight block 6 is placed inside the counterweight box 3. An annularly arranged airbag 7 is fixed at the bottom of the movable plate 2.
[0019] The water suction structure 4 includes a water suction pump 401 and a water suction pipe 402. The water suction pump 401 is fixedly installed on the top of the movable plate 2. The outlet flange of the water suction pump 401 is connected to a pipe for draining accumulated water. One end of the water suction pipe 402 is connected to the inlet flange of the water suction pump 401. The other end of the water suction pipe 402 passes through the movable plate 2 and extends to the bottom of the movable plate 2. The water suction pipe 402 passes through the bottom of the movable plate 2 where the airbag 7 is not connected. The water suction pump 401 is connected to an external power source.
[0020] The water suction pipe 402 extends to the bottom of the movable plate 2 and is connected to an extension pipe 8 that is L-shaped and rotated 90° clockwise. The short side of the extension pipe 8 is located on one side of the counterweight box 3. The water suction structure 4 also includes a filter screen 403, which is installed inside the extension pipe 8 on the side away from the water suction pipe 402.
[0021] The water-absorbing structure 4 is provided in two sets, and the two sets of water-absorbing structures 4 are respectively provided on both sides of the limiting rod 1, and the short sides of the extension tubes 8 on both sides are respectively provided on both sides of the counterweight box 3.
[0022] A load-bearing rod 9 is fixedly installed at the bottom of the movable plate 2. When the water level drops, the bottom of the load-bearing rod 9 abuts against the counterweight box 3. The height of the load-bearing rod 9 is higher than the height of the long side of the suction pipe 402 plus the extension pipe 8.
[0023] The limiting rod 1 has a square cross-section, and the movable plate 2 is sleeved on the outer ring of the limiting rod 1 and cannot rotate.
[0024] The airbag 7 has an inflation port on its side, and a sealing cap 10 is snapped onto the inflation port. The airbag 7 is inflated by an external air pump.
[0025] The specific implementation method of this example is as follows: When water accumulates in the foundation pit, the air bladder 7 is inflated using an external air pump. After inflation, the device is placed in the water. The movable plate 2 floats on the surface of the water under the action of the air bladder 7. The suction pumps 401 on both sides are turned on by an external power source. Under the action of the suction pumps 401, the water flows through the extension pipe 8 and the suction pipe 402, and is finally discharged through the pipe connected to the outlet of the suction pump 401. As the water decreases, the movable plate 2 descends, and the extension pipe 8 also descends, thoroughly draining the water. Under the action of the filter screen 403, the soil mixed in with the water in the foundation pit will not be discharged. After the drainage is completed, the counterweight 6 in the counterweight box 3 is first removed and moved out of the foundation pit, and then the device is moved out of the foundation pit to reduce labor intensity.
[0026] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.
Claims
1. A drainage device for a foundation pit in subway construction, comprising a limiting rod (1), a movable plate (2), a counterweight box (3), and a water-absorbing structure (4), characterized in that: The limiting rod (1) is fixed at the top center of the counterweight box (3). The movable plate (2) is movably sleeved on the outer ring of the limiting rod (1). The water-absorbing structure (4) is set on the top of the movable plate (2). The counterweight box (3) is a hollow box. The front side of the counterweight box (3) has an opening. The opening of the counterweight box (3) is fitted with a door (5). Both the door (5) and the opening of the counterweight box (3) are fitted with sealing rings. The door (5) and the counterweight box (3) are sealed together. A counterweight block (6) is placed inside the counterweight box (3). An airbag (7) is fixed at the bottom of the movable plate (2).
2. The foundation pit drainage device for subway construction according to claim 1, characterized in that: The water suction structure (4) includes a water suction pump (401) and a water suction pipe (402). The water suction pump (401) is fixedly installed on the top of the movable plate (2). One end of the water suction pipe (402) is connected to the water inlet flange of the water suction pump (401). The other end of the water suction pipe (402) passes through the movable plate (2) and extends to the bottom of the movable plate (2). The water suction pipe (402) passes through the bottom of the movable plate (2) where the airbag (7) is not connected.
3. A foundation pit drainage device for subway construction according to claim 2, characterized in that: The water suction pipe (402) extends to the bottom of the movable plate (2) and is connected to an extension pipe (8) that is L-shaped and rotated 90° clockwise. The short side of the extension pipe (8) is located on one side of the counterweight box (3). The water suction structure (4) also includes a filter screen (403), which is installed inside the extension pipe (8) on the side away from the water suction pipe (402).
4. A foundation pit drainage device for subway construction according to claim 3, characterized in that: The water-absorbing structure (4) is provided in two sets, and the two sets of water-absorbing structures (4) are respectively provided on both sides of the limiting rod (1), and the short sides of the extension tubes (8) on both sides are respectively provided on both sides of the counterweight box (3).
5. A foundation pit drainage device for subway construction according to claim 4, characterized in that: The bottom of the movable plate (2) is fixedly installed with a load-bearing rod (9). The bottom of the load-bearing rod (9) abuts against the counterweight box (3) when the water level drops. The height of the load-bearing rod (9) is higher than the height of the long side of the suction pipe (402) plus the extension pipe (8).
6. The foundation pit drainage device for subway construction according to claim 1, characterized in that: The limiting rod (1) has a square cross-section.
7. A foundation pit drainage device for subway construction according to claim 1, characterized in that: An inflation port is provided on the side of the airbag (7), and a sealing cap (10) is snapped onto the inflation port of the airbag (7).