Comprehensive dewatering and drainage system for foundation pit
By setting up sub-drainage devices and filter layers at the bottom of the foundation pit and using high-power water pumps for centralized drainage, the problem of untimely water return from the base was solved, and the base was kept dry and efficiently drained during the construction process.
Patent Information
- Application Number
- CN202422881228.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-25
- Publication Date
- 2025-09-30
- Estimated Expiration
- 2034-11-25
AI Technical Summary
During the excavation of the foundation pit, due to the timeliness of the survey report, continuous backflow may occur at the base, and the existing pumping well location cannot respond in time, resulting in untimely drainage.
At least two sub-drainage devices are set up at the temporary water collection point at the bottom of the foundation pit, including a sandless pipe, a second water pump, a water pipe and a cover plate. A high-power second water pump is used for collective drainage, and a filter layer is set around the sandless pipe to filter impurities. Steel pipes protect the water pipe and cables, and the cover plate seals the sandless pipe mouth to ensure that the base is dry during construction.
It improves the drainage efficiency at the bottom of the foundation pit, ensures that the base is dry during construction, avoids affecting the construction progress, and achieves efficient drainage effect.
Smart Images
Figure CN223398151U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of foundation pit drainage, and in particular to a comprehensive foundation pit drainage system. Background Art
[0002] When the geological survey report does not match the actual situation, after excavation to the base, continuous water backflow may occur at the base, and drainage measures must be continued on the basis of the original foundation pit support and dewatering measures.
[0003] Due to the timeliness of the survey report, pumping wells are usually set at fixed intervals according to the specifications based on the groundwater level. Some points where backflow occurs may not be taken care of, and drainage may not be timely. Therefore, further improvement is needed. Utility Model Content
[0004] In order to improve the drainage effect on the bottom of the foundation pit, the present application provides a foundation pit comprehensive drainage system.
[0005] This application provides a foundation pit comprehensive drainage system, which adopts the following technical solutions:
[0006] A comprehensive drainage system for a foundation pit comprises a sub-drainage device arranged at a base, an installation groove for installing the sub-drainage device is over-excavated at a temporary water collection point at the bottom of the foundation pit, the sub-drainage device comprises a sandless pipe inserted in the installation groove, a second water pump built into the sandless pipe, a water pipe connected to the water outlet of the second water pump to discharge water in the sandless pipe, and a cover plate arranged at the pipe mouth of the sandless pipe, the peripheral wall of the sandless pipe has a plurality of water-permeable holes, and the cover plate is penetrated by a through hole for the water pipe to pass through; at least two sub-drainage devices are arranged at the temporary water collection point of the foundation pit, and at least one of the two sub-drainage devices has a high-power second water pump.
[0007] By adopting the above technical solution, a total water collection position is determined near several locations where backflow occurs, and at least two sub-drainage devices are set at the total water collection position to collect and discharge the water. In order to improve the drainage efficiency, there is at least one high-power second water pump to reduce the possibility of untimely drainage. The temporary total water collection point at the bottom of the foundation pit is over-excavated to form an installation groove for the installation of the sub-drainage device. After the sandless pipe is buried in the installation groove, the water pump is placed in the sandless pipe. The cover plate is used to seal the upper pipe mouth of the sandless pipe, and the water supply pipe connected to the water pump is passed through the cover plate to extend outside the installation groove for drainage. The cover plate provided therein can allow the second water pump below to carry out subsequent processes such as concrete cushioning and waterproofing above during normal operation, thereby ensuring a dry working environment of the base without affecting the construction progress.
[0008] It should be noted that the above arrangement and placement is based on the originally set up drainage wells, and based on the instruments and equipment in the on-site pumping and drainage process, the construction process is easy to operate, and the drainage equipment module can be directly set up at the base where the accumulated water appears, and the key points can be efficiently pumped and dewatered with high efficiency, thereby improving the drainage effect of the base.
[0009] Preferably, the sub-drainage device further includes a first filter layer arranged outside the sandless pipe.
[0010] By adopting the above technical solution, a first filter layer is arranged around the sandless pipe. In addition to filling the opened installation groove, it also has a filtering effect to reduce the impurity content flowing into the sandless pipe, thereby reducing the damage to the second water pump due to excessive impurities when pumping water.
[0011] Preferably, the upper end of the sandless pipe is exposed in the installation groove, and the bottom wall of the foundation pit is also provided with a second filter layer, which abuts against the outer peripheral wall of the sandless pipe and is located above the first filter layer, and the cover plate abuts against the second filter layer.
[0012] By adopting the above technical solution, a second filter layer is set on the bottom wall of the foundation pit to isolate the water that originally overflowed from the surface of the bottom wall of the foundation pit to a certain extent, so as to maintain a relatively dry working environment for subsequent construction processes.
[0013] Preferably, the sub-drainage device further comprises a steel pipe provided on the cover plate, the axis of the steel pipe is parallel to the axis of the cover plate, and the water pipe and the cable on the second water pump are both passed through the steel pipe.
[0014] By adopting the above technical solution, a steel pipe is provided for the water pipe and the cable of the second water pump to pass through, thereby reducing the possibility of accidental damage to the water pipe and the cable of the second water pump when the steel bars are subsequently installed above the base.
[0015] Preferably, a steel frame is provided at the bottom of the foundation pit, the height of the steel pipe at the pipe mouth is higher than the steel frame, and a plug is detachably connected to the pipe mouth of the steel pipe.
[0016] By adopting the above technical solution, when the design requirements allow for the suspension of precipitation, after the second water pump is subsequently disconnected from the sandless pipe and the water pipe is disconnected from the steel pipe, the height of the steel pipe at the pipe mouth is higher than the reinforcement frame, and filler can be delivered into the sandless pipe through the pipe mouth of the steel pipe for backfilling and blocking. Moreover, after the foundation slab reinforcement construction is completed and the foundation slab concrete pouring tanker and pump truck are in place on site, the pipe mouth of the foundation steel pipe is blocked with a plug to reduce the possibility of concrete flowing into the sandless pipe through the steel pipe.
[0017] Preferably, the cover plate includes a mounting plate for mounting the steel pipe to abut against an abutment ring on the sandless pipe, the diameter of the mounting plate is larger than the diameter of the second water pump, and the inner peripheral wall of the abutment ring is protruding with an abutment plate abutting against the lower surface of the mounting plate.
[0018] By adopting the above technical solution, for the base after laying the steel frame, compared with separating the entire cover plate from the sandless pipe, by providing a mounting plate and abutting the abutment plate provided on the abutment ring, it is relatively convenient to pull the second water pump out of the sandless pipe along with the mounting plate.
[0019] Preferably, a limiting plate is protruding from the outer peripheral wall of the mounting plate, and a slot for inserting the limiting plate is provided on the upper surface of the abutting ring.
[0020] By adopting the above technical solution and providing a limit plate, the possibility of the mounting plate rotating around its own axis due to external force is reduced.
[0021] Preferably, a connecting piece is provided on the mounting plate, and the mounting plate is detachably connected to the abutment ring through the connecting piece. The connecting piece includes a connecting bolt passing through the limiting plate and a connecting nut threadedly connected to the connecting bolt. The connecting bolt passes through the slot to extend to the bottom of the abutment ring, and the connecting nut is fixedly connected to the lower surface of the abutment ring.
[0022] By adopting the above technical solution, the mounting plate is mounted on the abutment ring by inserting connecting bolts through the limiting plate and the abutment ring and then threading them together with the connecting nuts. Furthermore, the mounting plate can be easily removed from the abutment ring by the connecting bolts and the connecting nuts, thereby removing the second water pump from the sandless pipe. Furthermore, after subsequent drainage is completed, the opening formed in the middle of the abutment ring can be sealed with the mounting plate without the steel pipe, thereby reducing the possibility of the steel pipe being cast with the subsequent concrete pouring.
[0023] In summary, the present invention has the following beneficial effects:
[0024] A total water collection location is determined near several locations where backflow occurs, and at least two sub-drainage devices are set at the total water collection location to collect and discharge the water. In order to improve drainage efficiency, the power of one of the sub-drains needs to be the largest to reduce the possibility of untimely drainage. The temporary total water collection location at the bottom of the foundation pit is over-excavated to form an installation groove for the sub-drainage device. After the sandless pipe is buried in the installation groove, the water pump is placed in the sandless pipe. The cover plate is used to seal the upper pipe opening of the sandless pipe, and the water pipe connected to the water pump is passed through the cover plate to extend outside the installation groove for drainage. The cover plate provided therein allows the second water pump below to carry out subsequent processes such as concrete cushioning and waterproofing on the upper part during normal operation, thereby ensuring a dry working environment of the base without affecting the construction progress. BRIEF DESCRIPTION OF THE DRAWINGS
[0025] Figure 1 This is a schematic diagram of the overall structure of Example 1 of the present application;
[0026] Figure 2 This is a schematic structural diagram of the neutron drainage device in Example 1 of the present application;
[0027] Figure 3 This is a schematic structural diagram of the plug in Example 1 of the present application;
[0028] Figure 4 This is a schematic structural diagram of the cover plate in Example 2 of the present application;
[0029] Figure 5 yes Figure 4 A partial enlarged schematic diagram of part A.
[0030] Explanation of the accompanying symbols: 1. Main drainage device; 11. Pumping well; 12. First water pump; 13. Drainage pipe; 2. Sub-drainage device; 21. Sand-free pipe; 22. First filter layer; 23. Second filter layer; 24. Second water pump; 25. Water pipe; 26. Cover plate; 261. Mounting plate; 262. Abutment ring; 263. Slot; 27. Steel pipe; 271. Plug; 3. Water tank; 4. Sewage well; 5. Abutment plate; 6. Limiting plate; 7. Connecting piece; 71. Connecting bolt; 72. Connecting nut. DETAILED DESCRIPTION
[0031] The following is combined with Figure 1-5 , further details of this application are given.
[0032] The embodiment of the present application discloses a foundation pit comprehensive drainage system.
[0033] Example 1:
[0034] A comprehensive drainage system for foundation pits, referring to Figure 1 、 Figure 2, including a main drainage device 1 and a sub-drainage device 2 arranged on the base. It should be noted that the main drainage device 1 is set according to the previous on-site survey report, and usually specifically includes a number of pumping wells 11 arranged at intervals along the length and width directions of the base, a first pumping pump 12 built into the pumping well 11, a drainage pipe 13 connected to the first pumping pump 12, and an on-site distribution box (not shown in the figure) that provides power to the pumping pump. Since the main drainage device 1 is a prior art, it will not be described in detail here.
[0035] An installation groove for the sub-drainage device 2 is over-excavated at the temporary water collection point at the bottom of the foundation pit. The sub-drainage device 2 includes a sandless pipe 21 inserted in the installation groove, a first filter layer 22 and a second filter layer 23 arranged outside the sandless pipe 21, a second water pump 24 built into the sandless pipe 21, a water pipe 25 connected to the water outlet end of the second water pump 24 to discharge the water in the sandless pipe 21, a cover plate 26 arranged at the pipe mouth of the sandless pipe 21, and a steel pipe 27 arranged on the cover plate 26.
[0036] In this embodiment, a plurality of sub-drainage devices 2 are arranged at intervals along the width direction of the base, and are specifically arranged according to needs. At least two sub-drainage devices 2 are arranged at the temporary water collection point of the foundation pit, and at least one of the two sub-drainage devices 2 has a high-power second water pump 24. It should be noted that the sub-drainage devices 2 are arranged and placed based on the originally set main drainage device 1. Based on the instruments and equipment used in the on-site pumping and drainage process, the construction process is easy to operate. The drainage equipment module can be directly installed at the base where water accumulates, and the key points can be pumped and drained efficiently, thereby improving the drainage effect of the base.
[0037] Among them, the peripheral wall of the sandless pipe 21 has a plurality of water-permeable holes, the upper end of the sandless pipe 21 is exposed to the installation groove, the first filter layer 22 is built into the installation groove, and covers the sandless pipe 21 to the notch of the installation groove. The second filter layer 23 is set on the bottom wall of the foundation pit to cover a certain height, and abuts against the outer peripheral wall of the sandless pipe 21, and is located above the first filter layer 22. At this time, the edge of the cover plate 26 abuts against the second filter layer 23. It should be noted that the second filter layer 23 can be covered on the edge of the cover plate 26, and the specific setting is based on the needs. As for the connection between the cover plate 26 and the sandless pipe 21, it can be abutted or the cover plate 26 can be installed on the sandless pipe 21 by bolts, and the specific setting is based on the needs.
[0038] Reference Figure 2 、 Figure 3The axis of the steel pipe 27 is parallel to the axis of the cover plate 26. In this embodiment, the steel pipe 27 is fixedly installed on the cover plate 26. The steel pipe 27 is a galvanized steel pipe 27. The water pipe 25 and the cables on the second water pump 24 are all installed on the steel pipe 27. Since a steel frame will be laid at the bottom of the foundation pit later, the height of the steel pipe 27 at the pipe mouth is higher than the steel frame. The pipe mouth of the steel pipe 27 is detachably connected with a plug 271. When the precipitation is allowed to stop according to the design requirements, after the second water pump 24 is disconnected from the sandless pipe 21 and the water pipe 25 is disconnected from the steel pipe 27, after the foundation bottom plate reinforcement construction is completed and the foundation bottom plate concrete pouring tank truck and pump truck are in place on site, the pipe mouth of the steel pipe 27 is sealed by the plug 271 to reduce the possibility of concrete flowing into the sandless pipe 21 through the steel pipe 27.
[0039] Back to Figure 1 The water extracted from several pumping wells 11 is temporarily stored by converging the drainage pipes 13 to a temporary central water collection point, where it is then pumped out by a second pump 24. It should be noted that the temporary water collection point may be too far from the final drainage destination, namely the sewage well 4, and the performance of conventional pumps may be insufficient. In this case, a water tank 3 can be set up outside the foundation pit to pump water through a water pipe 25 via a second pump 24 to the water tank 3. The water is then transported from the water tank 3 to the final drainage point, sewage well 4, through the water collection pipe, due to the natural water flow at the height difference (the water tank 3 is at a high position and the sewage well 4 is at a low position).
[0040] The implementation principle of the comprehensive drainage system for foundation pits in the embodiment of the present application is as follows: a total water collection location is determined near several locations where backflow occurs, and at least two sub-drainage devices 2 are set at the total water collection location to collect and discharge the water. In order to improve drainage efficiency, the power of one of the sub-drainage devices needs to be the largest to reduce the possibility of untimely drainage. The temporary total water collection location at the bottom of the foundation pit is over-excavated to form an installation groove for the sub-drainage device 2 to be installed. After the sandless pipe 21 is buried in the installation groove, the water pump is placed in the sandless pipe 21. The cover plate 26 is used to seal the upper pipe opening of the sandless pipe 21, and the water supply pipe 25 connected to the water pump is passed through the cover plate 26 to extend outside the installation groove for drainage. The cover plate 26 provided therein allows the second water pump 24 below to carry out subsequent processes such as concrete cushioning and waterproofing on the top during normal operation, thereby ensuring a dry working environment of the base without affecting the construction progress.
[0041] Example 2:
[0042] Reference Figure 4 、 Figure 5The difference from Example 1 is that the cover plate 26 includes a mounting plate 261 for mounting the steel pipe 27, which abuts against an abutment ring 262 on the sandless pipe 21. The diameter of the mounting plate 261 is larger than the diameter of the second water pump 24. The inner peripheral wall of the abutment ring 262 is provided with an abutment plate 5 that abuts against the lower surface of the mounting plate 261. The outer peripheral wall of the mounting plate 261 is provided with a limit plate 6, and the upper surface of the abutment ring 262 defines a slot 263 for inserting the limit plate 6.
[0043] Reference Figure 4 、 Figure 5 A connecting piece 7 is provided on the mounting plate 261, and the mounting plate 261 is detachably connected to the abutment ring 262 through the connecting piece 7. The connecting piece 7 includes a connecting bolt 71 passing through the limiting plate 6 and a connecting nut 72 threadedly connected to the connecting bolt 71. The connecting bolt 71 passes through the slot 263 to extend to the bottom of the abutment ring 262, and the connecting nut 72 is fixedly connected to the lower surface of the abutment ring 262.
[0044] It should be noted that after the subsequent drainage is completed, the opening formed in the middle of the abutment ring 262 can be sealed by the mounting plate 261 without the steel pipe 27, thereby reducing the possibility of pouring the steel pipe 27 together during the subsequent concrete pouring.
[0045] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.
Claims
1. A comprehensive drainage system for foundation pits, characterized by: The invention comprises a sub-drainage device (2) arranged on a base, wherein a temporary water collection point at the bottom of the foundation pit is over-excavated with an installation groove for installing the sub-drainage device (2), and the sub-drainage device (2) comprises a sandless pipe (21) inserted in the installation groove, a second water pump (24) built in the sandless pipe (21), a water delivery pipe (25) connected to the water outlet of the second water pump (24) to discharge water in the sandless pipe (21), and a cover plate (26) arranged at the pipe mouth of the sandless pipe (21), wherein the peripheral wall of the sandless pipe (21) has a plurality of water-permeable holes, and the cover plate (26) is penetrated by a through hole for the water delivery pipe (25) to pass through; at least two sub-drainage devices (2) are arranged at the temporary water collection point of the foundation pit, and at least one of the two sub-drainage devices (2) has a high-power second water pump (24).
2. The comprehensive drainage system for foundation pit according to claim 1, characterized in that: The sub-drainage device (2) further comprises a first filter layer (22) arranged outside the sand-free pipe (21).
3. The comprehensive drainage system for foundation pit according to claim 2, characterized in that: The upper end of the sandless pipe (21) is exposed in the installation groove, and the bottom wall of the foundation pit is also provided with a second filter layer (23). The second filter layer (23) abuts against the outer peripheral wall of the sandless pipe (21) and is located above the first filter layer (22). The cover plate (26) abuts against the second filter layer (23).
4. The comprehensive drainage system for foundation pit according to claim 1, characterized in that: The sub-drainage device (2) further comprises a steel pipe (27) arranged on the cover plate (26), the axis of the steel pipe (27) being parallel to the axis of the cover plate (26), and the water pipe (25) and the cable on the second water pump (24) are both passed through the steel pipe (27).
5. The comprehensive drainage system for foundation pit according to claim 4, characterized in that: A steel frame is provided at the bottom of the foundation pit, the height of the steel pipe (27) at the pipe opening is higher than the steel frame, and a plug (271) is detachably connected to the pipe opening of the steel pipe (27).
6. The comprehensive drainage system for foundation pit according to claim 4, characterized in that: The cover plate (26) includes a mounting plate (261) for mounting the steel pipe (27) to abut against an abutting ring (262) on the sandless pipe (21); the diameter of the mounting plate (261) is larger than the diameter of the second water pump (24); and an abutting plate (5) is protruding from the inner peripheral wall of the abutting ring (262) to abut against the lower surface of the mounting plate (261).
7. The comprehensive drainage system for foundation pit according to claim 6, characterized in that: A limiting plate (6) is protruding from the outer peripheral wall of the mounting plate (261), and a slot (263) for inserting the limiting plate (6) is provided on the upper surface of the abutting ring (262).
8. The comprehensive drainage system for foundation pit according to claim 7, characterized in that: A connecting member (7) is provided on the mounting plate (261), and the mounting plate (261) is detachably connected to the abutting ring (262) via the connecting member (7). The connecting member (7) includes a connecting bolt (71) passing through the limiting plate (6) and a connecting nut (72) threadedly connected to the connecting bolt (71). The connecting bolt (71) passes through the slot (263) to extend to the bottom of the abutting ring (262), and the connecting nut (72) is fixedly connected to the lower surface of the abutting ring (262).