A building foundation pit drainage structure

Abstract

The present invention discloses a drainage structure for a building foundation pit, which includes a sump well, a drainage ditch, a well pipe, a drain pipe, and a filter barrel; the well pipe is placed in the sump well, and an outer filter material is filled between the well pipe and the sump well. The well pipe has a filter pipe section and a flushing water outlet section, and a partition is provided between the filter pipe section and the flushing water outlet section, and a valve is arranged on the partition; the drain pipe is coaxially arranged in the well pipe, the drain pipe passes through the partition, the lower end of the drain pipe extends into the filter pipe section, and the upper end of the drain pipe passes through the drainage ditch; a central inner ring body is provided in the filter barrel, the filter barrel is placed inside the upper part of the well pipe, the inner ring body is sleeved outside the drain pipe, the outer barrel wall of the filter barrel is adapted to the inner wall of the well pipe and forms a seal for the flushing water outlet section, and filter holes are provided on the inner ring body and / or the bottom plate of the filter barrel. The present invention can not only filter the sediment in rainwater and groundwater during the drainage of the foundation pit, but also facilitate the dredging and maintenance of the filtering structure in the sump well.

Description

Technical Field

[0001] The present invention relates to the technical field of foundation pit construction, and particularly to a drainage structure for building foundation pits. Background Art

[0002] Generally, the drainage inside the foundation pit is carried out by combining open ditch drainage and sump wells, that is, drainage ditches and sump wells are arranged at the bottom of the foundation pit. On the one hand, rainwater can be collected into the sump well through the drainage ditch, and at the same time, the groundwater at the bottom of the foundation pit can seep into the sump well. The water in the sump well is pumped out of the foundation pit through a water pump. In this way, both the requirements of rainwater drainage and the requirement of lowering the groundwater level at the bottom of the foundation pit can be met.

[0003] The specification of Chinese invention patent CN110080260B discloses a drainage and dewatering structure for a foundation pit. This drainage and dewatering structure of the foundation pit filters the groundwater seeping into the sump well by arranging a filtering structure in the permeable pipe, and at the same time filters the rainwater flowing from the drainage ditch into the sump well by arranging a permeable filter cloth between the connecting pipe and the permeable pipe. Although it can filter the water in the sump well better, the structure for filtering groundwater and the permeable filter cloth for filtering the water flowing from the drainage ditch are easily blocked by sediment, and it is difficult to dredge after being blocked, and the maintenance is relatively difficult. Summary of the Invention

[0004] Aiming at the defects in the prior art, the present invention provides a drainage structure for building foundation pits, so that it can not only filter the sediment in rainwater and groundwater during the drainage of the foundation pit, but also facilitate the dredging and maintenance of the filtering structure in the sump well.

[0005] The present invention provides a drainage structure for building foundation pits, including a sump well and a drainage ditch arranged at the bottom of the foundation pit, and the upper end of the sump well is connected to the drainage ditch; further comprising:

[0006] A well pipe, which is placed in the sump well, and an outer filter material is filled between the well pipe and the sump well. The well pipe has a filtering pipe section and a flushing water outlet section. The filtering pipe section is arranged below the flushing water outlet section, and a partition is arranged between the filtering pipe section and the flushing water outlet section. A plurality of openable and closable valves are arranged on the partition.

[0007] A drain pipe, which is coaxially arranged in the well pipe, passes through the partition and is hermetically connected to the partition. The lower end of the drain pipe extends into the filtering pipe section, and the upper end of the drain pipe passes through the drainage ditch.

[0008] A filtering bucket, a central inner ring body is arranged in the center of the filtering bucket. The filtering bucket is placed in the pipe at the upper part of the well pipe, and the inner ring body in the center of the filtering bucket is sleeved outside the drain pipe. The outer barrel wall of the filtering bucket is adapted to the inner wall of the well pipe and forms a blockage for the flushing water outlet section. Filtering holes are arranged on the inner ring body and / or the bottom plate of the filtering bucket.

[0009] Further, a plurality of water passing holes corresponding to the valves one by one are provided on the partition plate. The valve includes a valve seat fixed below the water passing hole, a valve plate capable of blocking the lower side of the water passing hole, a compression spring supported between the valve seat and the valve plate, and a valve rod connected to the upper side of the valve plate and passing through the water passing hole. When the filter barrel is inserted into the well pipe, the bottom of the filter barrel abuts against the upper end of the valve rod, so that the valve plate and the water passing hole are maintained in an open state.

[0010] Further, the valve seat is fixed on the lower side of the partition plate. A guide groove is vertically arranged inside the valve seat, and a water outlet hole communicating the inside and outside of the guide groove is provided at the upper part of the valve seat. The valve plate is adapted to the guide groove, and both ends of the compression spring are respectively supported on the lower side of the valve plate and the bottom of the guide groove.

[0011] Further, an outer sleeve is coaxially arranged outside the drain pipe. The lower end of the outer sleeve extends to the upper side of the partition plate, the upper end of the outer sleeve passes through the drain ditch and is blocked outside the drain pipe, and a side interface is provided at the side part of the outer sleeve near its upper end.

[0012] Further, the inner ring body includes an upper ring part and a lower ring part. The upper ring part is adapted to the outside of the outer sleeve, the lower ring part is a conical ring with an enlarged diameter at the lower part, and filter holes are provided on the lower ring part.

[0013] Further, the lower end of the outer barrel wall of the filter barrel protrudes from the bottom plate and is supported on the partition plate.

[0014] Further, the filter barrel is composed of two half-barrel bodies vertically separated from the center.

[0015] Further, a cross bar is connected between the outer barrel wall of each half-barrel body and the inner ring body.

[0016] Further, the outer filter material is gravel, and viscous soil is filled between the upper ends of the water collection well and the well pipe.

[0017] Further, a sedimentation pipe section is provided on the lower side of the filter pipe section.

[0018] The beneficial effects of the present invention are embodied in that:

[0019] During drainage, the upper end of the drain pipe is connected to a water pump, and each valve on the partition plate is opened. The flushing and water outlet section of the well pipe is blocked by the outer barrel wall of the filter barrel. The groundwater at the bottom of the foundation pit can seep into the well pipe after being filtered by the filter pipe section of the well pipe. Rainwater can flow into the filter barrel through the drain ditch, and then flow into the well pipe after being filtered by the filter barrel. The water collected in the well pipe can be discharged through the water pump. When draining the foundation pit, the sediment in rainwater and groundwater is filtered, which can reduce the sediment entering the well pipe, thereby reducing the siltation of the well pipe.

[0020] During cleaning, the filter barrel is taken out from the well pipe, and the sediment filtered by the filter barrel can be directly poured out. After the filter barrel is taken out, the flushing water outlet section of the well pipe is opened. The upper end of the drain pipe is connected to a pressure water pump, and each valve on the partition plate is closed. The pressure water pump injects clear water into the well pipe below the partition plate. The clear water is pressed out from the flushing water outlet section, flows upward through the outer filter material, and flushes the sediment into the well pipe above the partition plate from the flushing water outlet section. Finally, the muddy water containing sediment in the well pipe above the partition plate is drained away by a slurry pump, so as to realize the backwashing of the filter pipe section and the outer filter material.

[0021] Therefore, the present application can not only filter the sediment in rainwater and groundwater during the foundation pit drainage, but also facilitate the dredging and maintenance of the filtering structure in the sump. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the specific embodiments. In all the drawings, similar devices or parts are generally identified by similar reference numerals. In the drawings, the devices or parts are not necessarily drawn to actual scale.

[0023] Figure 1 It is a schematic structural diagram during drainage in an embodiment of the present invention;

[0024] Figure 2 It is a schematic structural diagram when cleaning the sediment in an embodiment of the present invention;

[0025] Figure 3 It is a schematic structural diagram of the filter barrel in an embodiment of the present invention.

[0026] In the drawings, 100 - sump; 200 - drainage ditch; 300 - well pipe; 310 - outer filter material; 320 - filter pipe section; 330 - flushing water outlet section; 340 - partition plate; 341 - water passing hole; 350 - valve; 351 - valve seat; 3511 - guiding groove; 3512 - water outlet hole; 352 - valve disc; 353 - compression spring; 354 - valve rod; 360 - cohesive soil; 370 - sedimentation pipe section; 400 - drain pipe; 410 - outer sleeve; 420 - side interface; 500 - filter barrel; 510 - inner ring body; 511 - upper ring part; 512 - lower ring part; 520 - outer barrel wall; 530 - bottom plate; 540 - half barrel body; 550 - cross bar; 600 - water pump; 700 - pressure water pump; 800 - slurry pump. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] The embodiments of the technical solution of the present invention will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, so they are only examples and cannot be used to limit the protection scope of this patent.

[0028] As Figures 1 - 3 shown, the embodiment of the present invention provides a building foundation pit drainage structure, which includes a sump 100, a drainage ditch 200, a well pipe 300, a drain pipe 400 and a filter barrel 500 arranged at the bottom of the foundation pit. The upper end of the sump 100 is connected to the drainage ditch 200.

[0029] The well pipe 300 is placed in the sump 100. An outer filter material 310 is filled between the well pipe 300 and the sump 100. The outer filter material 310 is specifically gravel. In order to prevent rainwater on the ground from carrying sediment into the outer filter material 310, cohesive soil 360 is filled at the upper end between the sump 100 and the well pipe 300.

[0030] The well pipe 300 has a filter pipe section 320 and a flushing water outlet section 330. Filter holes are distributed on the filter pipe section 320, which plays a role in filtering the groundwater seeping into the well pipe 300. Holes through which sediment can pass are distributed on the flushing water outlet section 330. The filter pipe section 320 is arranged below the flushing water outlet section 330. A partition plate 340 is provided between the filter pipe section 320 and the flushing water outlet section 330, and a number of openable and closable valves 350 are arranged on the partition plate 340.

[0031] Preferably, a sedimentation pipe section 370 is provided on the lower side of the filter pipe section 320, so that even if there is sediment that has not been filtered cleanly, it can be deposited in the sedimentation pipe section 370, thus avoiding sediment deposition in the filter pipe section 320.

[0032] The drain pipe 400 is coaxially arranged in the well pipe 300. The drain pipe 400 passes through the partition plate 340 and is hermetically connected to the partition plate 340. The lower end of the drain pipe 400 extends into the filter pipe section 320, and the upper end of the drain pipe 400 passes through the drainage ditch 200.

[0033] An inner ring body 510 is provided at the center of the filter barrel 500. The filter barrel 500 is placed in the upper part of the well pipe 300, and the inner ring body 510 at the center of the filter barrel 500 is sleeved outside the drain pipe 400. The outer barrel wall 520 of the filter barrel 500 is adapted to the inner wall of the well pipe 300 and forms a seal for the flushing water outlet section 330. Filter holes are provided on the inner ring body 510 and / or the bottom plate 530 of the filter barrel 500.

[0034] As Figure 1As shown in the figure, during drainage, the upper end of the drain pipe 400 is connected to the water pump 600, each valve 350 on the partition plate 340 is opened, the flushing water outlet section 330 of the well pipe 300 is blocked by the outer barrel wall 520 of the filter barrel 500, the groundwater at the bottom of the foundation pit can seep into the well pipe 300 after being filtered by the filter pipe section 320 of the well pipe 300, the rainwater can flow into the filter barrel 500 through the drainage ditch 200, and then flow into the well pipe 300 after being filtered by the filter barrel 500. The water collected in the well pipe 300 can be discharged through the water pump 600. When draining the foundation pit, the sediment in the rainwater and groundwater is filtered, which can reduce the sediment entering the well pipe 300, thereby reducing the siltation of the well pipe 300.

[0035] As Figure 2 shown in the figure, during cleaning, the filter barrel 500 is taken out from the well pipe 300, and the sediment filtered by the filter barrel 500 can be directly poured out. After the filter barrel 500 is taken out, the flushing water outlet section 330 of the well pipe 300 is opened, the upper end of the drain pipe 400 is connected to the pressure water pump 700, each valve 350 on the partition plate 340 is closed, the pressure water pump 700 injects clean water into the well pipe 300 below the partition plate 340, the clean water is pressed out from the flushing water outlet section 330, flows upward through the outer filter material 310, and flushes the sediment from the flushing water outlet section 330 into the well pipe 300 above the partition plate 340. Finally, the muddy water containing sediment in the well pipe 300 above the partition plate 340 is drained away through the mud pump 800, thereby realizing the backwashing of the filter pipe section 320 and the outer filter material 310.

[0036] Therefore, the present application can not only filter the sediment in the rainwater and groundwater during the drainage of the foundation pit, but also facilitate the dredging and maintenance of the filter structure in the sump 100.

[0037] In this embodiment, referring to Figure 1 and Figure 2 , a plurality of water passing holes 341 corresponding to the valves 350 one by one are provided on the partition plate 340. The valve 350 includes a valve seat 351 fixed below the water passing hole 341, a valve plate 352 capable of blocking the lower side of the water passing hole 341, a compression spring 353 supported between the valve seat 351 and the valve plate 352, and a valve rod 354 connected to the upper side of the valve plate 352 and passing through the water passing hole 341. When the filter barrel 500 is inserted into the well pipe 300, the bottom of the filter barrel 500 abuts against the upper end of the valve rod 354, so that the valve plate 352 and the water passing hole 341 are maintained in an open state.

[0038] Specifically, the valve seat 351 is fixed on the lower side of the partition plate 340. A guiding groove 3511 is vertically arranged in the valve seat 351. An outlet hole 3512 communicating the inside and outside of the guiding groove 3511 is provided at the upper part of the valve seat 351. The valve plate 352 is adapted to the guiding groove 3511. The two ends of the compression spring 353 are respectively supported on the lower side of the valve plate 352 and the bottom of the guiding groove 3511.

[0039] Referring to Figure 1 , when the filter barrel 500 is inserted into the well pipe 300, the bottom of the filter barrel 500 abuts against the upper end of the valve stem 354, so that the valve stem 354 pushes the valve plate 352 open. At this time, the water filtered by the filter barrel 500 can flow down through the water passing holes 341, meeting the requirement that the valve 350 is opened during drainage. When the filter barrel 500 is taken out of the well pipe 300, the valve plate 352 moves upward under the action of the compression spring 353, so that the valve plate 352 blocks the water passing holes 341 on the partition plate 340, and the backwashing operation of the filter pipe section 320 and the outer filter material 310 can be carried out. The structure of this valve 350 is simple and does not require separate control.

[0040] In this embodiment, referring to Figure 1 and Figure 2 , an outer sleeve 410 is coaxially arranged outside the drain pipe 400. The lower end of the outer sleeve 410 extends to the upper side of the partition plate 340, and the upper end of the outer sleeve 410 passes through the drain ditch 200 and is blocked outside the drain pipe 400. A side interface 420 is provided on the side of the outer sleeve 410 near its upper end. As Figure 2 shown, during the process of backwashing the filter pipe section 320 and the outer filter material 310, the mud pump 800 is connected to the side interface 420 at the upper end of the outer sleeve 410, and the mud pump 800 can drain the sediment-containing water in the well pipe 300 above the partition plate 340 through the outer sleeve 410.

[0041] In this embodiment, referring to Figure 1 and Figure 3 , the inner ring body 510 includes an upper ring portion 511 and a lower ring portion 512. The upper ring portion 511 is adapted to the outside of the outer sleeve 410, and the lower ring portion 512 is a conical ring with an enlarged lower diameter. Filter holes are provided on the lower ring portion 512. The upper ring portion 511 of the inner ring body 510 holds tightly outside the outer sleeve 410, which can prevent rainwater carrying sediment from directly entering the well pipe 300 between the outer sleeve 410 and the inner ring body 510. At the same time, the lower ring portion 512 of the inner ring body 510 is arranged as a conical ring, creating a distance from the outer sleeve 410. The rainwater entering the filter barrel 500 can be filtered out through the lower ring portion 512. In this way, even if the sediment deposited in the filter barrel 500 rises, the requirement for rainwater filtration can still be met.

[0042] In this embodiment, the lower end of the outer barrel wall 520 of the filter barrel 500 protrudes from the bottom plate 530 and supports on the partition plate 340. When the filter barrel 500 is inserted into the well pipe 300, the lower end of the outer barrel wall 520 supports on the partition plate 340, and the bottom plate 530 of the outer barrel wall 520 is spaced apart from the partition plate 340, which facilitates the flow of water.

[0043] In this embodiment, the filter barrel 500 is composed of two semi-barrel bodies 540 that are vertically separated from the center. When inserted, the two semi-barrel bodies 540 are combined into a cylindrical barrel that hugs the outside of the drain pipe 400. When pulled out, the two semi-barrel bodies 540 are pulled out separately. To facilitate the insertion and extraction operations of the two semi-barrel bodies 540, a cross bar 550 is connected between the outer barrel wall 520 and the inner ring body 510 of each semi-barrel body 540.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered by the scope of the claims and the description of the present invention.

Claims

1. A building foundation pit drainage structure, comprising a sump well and a drainage ditch arranged at the bottom of the foundation pit, the upper end of the sump well being connected to the drainage ditch, characterized in that, It further includes: A well pipe which is placed in a sump. An outer filter material is filled between the well pipe and the sump. The well pipe has a filtering pipe section and a flushing water outlet section. The filtering pipe section is arranged below the flushing water outlet section. A partition is provided between the filtering pipe section and the flushing water outlet section, and a number of openable and closable valves are arranged on the partition; A drain pipe which is coaxially arranged in the well pipe. The drain pipe passes through the partition and is hermetically connected to the partition. The lower end of the drain pipe extends into the filtering pipe section, and the upper end of the drain pipe passes through the drainage ditch; A filter bucket which has an inner ring body at its center. The filter bucket is placed inside the upper part of the well pipe, and the inner ring body at the center of the filter bucket is sleeved outside the drain pipe. The outer barrel wall of the filter bucket fits the inner wall of the well pipe and forms a seal for the flushing water outlet section. Filter holes are provided on the inner ring body and / or the bottom plate of the filter bucket; A number of water passing holes corresponding to each of the valves one by one are provided on the partition. The valve includes a valve seat fixed below the water passing hole, a valve plate capable of blocking the lower side of the water passing hole, a compression spring supported between the valve seat and the valve plate, and a valve rod connected to the upper side of the valve plate and passing through the water passing hole. When the filter bucket is inserted into the well pipe, the bottom of the filter bucket abuts against the upper end of the valve rod, so that the valve plate and the water passing hole remain in an open state.

2. The building foundation pit drainage structure according to claim 1, wherein The valve seat is fixed on the lower side of the partition. A guiding groove is vertically arranged inside the valve seat, and a water outlet hole communicating the inside and outside of the guiding groove is provided at the upper part of the valve seat. The valve plate fits inside the guiding groove, and the two ends of the compression spring are respectively supported on the lower side of the valve plate and the bottom of the guiding groove.

3. The building foundation pit drainage structure according to claim 1, wherein An outer sleeve pipe is coaxially arranged outside the drain pipe. The lower end of the outer sleeve pipe extends to the upper side of the partition, and the upper end of the outer sleeve pipe passes through the drainage ditch and blocks the outside of the drain pipe. A side interface is provided at the side part of the outer sleeve pipe near its upper end.

4. The building foundation pit drainage structure according to claim 3, wherein The inner ring body includes an upper ring part and a lower ring part. The upper ring part fits outside the outer sleeve pipe, and the lower ring part is a conical ring with an enlarged diameter at the lower part. Filter holes are provided on the lower ring part.

5. The building foundation pit drainage structure according to claim 1, wherein The lower end of the outer barrel wall of the filter bucket protrudes from the bottom plate and is supported on the partition.

6. The building foundation pit drainage structure according to claim 1 or 4 or 5, wherein The filter bucket is composed of two semi-bucket bodies vertically separated from the center.

7. The building foundation pit drainage structure according to claim 6, wherein A cross bar is connected between the outer barrel wall and the inner ring body of each semi-bucket body.

8. The building foundation pit drainage structure according to claim 1, wherein The outer filter material is gravel, and cohesive soil is filled at the upper end between the sump and the well pipe.

9. The building foundation pit drainage structure according to claim 1, wherein A sedimentation pipe section is provided below the filtering pipe section.

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