CN214301810U - Deep foundation pit drainage structure - Google Patents

Abstract

The application relates to a deep foundation pit drainage structure, which comprises a foundation pit body; the foundation pit body is provided with a pit opening, and the bottom wall of the foundation pit body is provided with a water collecting pit; a brick bed film reinforcing layer is arranged on the periphery of the temporary water collecting pit; a water pump which leads water out of the foundation pit body is arranged in the water collecting pit; the bottom wall of the foundation pit body is provided with a plurality of water diversion blind ditches; a water diversion pipe which penetrates through the end face of the water diversion blind ditch and the side wall of the brick bed film reinforcing layer and is communicated with the inner cavity of the sump is arranged at the ditch bottom of the water diversion blind ditch; the water conduit is provided with a plurality of through holes penetrating through the side wall; a water strainer for wrapping the water conduit is arranged on the outer side of the water conduit; a pebble water filtering layer which fills a gap between the diversion blind ditch and the diversion pipe is arranged in the diversion blind ditch; and a non-woven fabric layer is arranged on one side of the pebble water filtering layer, which is far away from the water conduit. This application has the effect that improves the infiltration hidden danger problem.

Description

Deep foundation pit drainage structure

Technical Field

The application relates to the field of foundation pit drainage, especially relates to a deep foundation pit drainage structures.

Background

The deep foundation pit is an engineering with the excavation depth of more than 5 meters or the excavation depth of not more than 5 meters, but the geological conditions, the surrounding environment and underground pipelines are particularly complex, the foundation pit engineering mainly comprises the design and construction of a foundation pit supporting system and the excavation of earthwork, and the deep foundation pit is a system engineering with strong comprehensiveness. When installing the raft in the foundation ditch, need the stability of special attention foundation ditch bottom.

At present, when a deep foundation pit is dug deeply, particularly in an area with a high underground water level, a soil water-bearing layer is cut off, underground water can continuously infiltrate into the foundation pit, and quicksand and side slope instability are caused or the bearing capacity of a foundation is reduced. When carrying out deep basal pit excavation, generally the holding power layer is well weathered mud rock stratum, even set up precipitation well on the foundation ditch limit, is little to the row effect that falls of basement rock fracture water, because the continuous seepage of fracture water, difficult assurance waterproof construction's quality, and then leave the infiltration hidden danger.

SUMMERY OF THE UTILITY MODEL

In order to improve the problem of infiltration hidden danger, the application provides a deep basal pit drainage structures.

The application provides a deep basal pit drainage structures adopts following technical scheme:

a deep foundation pit drainage structure comprises a foundation pit body; the foundation pit body is provided with a pit opening, and the bottom wall of the foundation pit body is provided with a water collecting pit; a brick bed film reinforcing layer is arranged on the periphery of the water collecting pit; a water pump which leads water out of the foundation pit body is arranged in the water collecting pit; the bottom wall of the foundation pit body is provided with a plurality of water diversion blind ditches; a water diversion pipe which penetrates through the end face of the water diversion blind ditch and the side wall of the brick bed film reinforcing layer and is communicated with the inner cavity of the sump is arranged at the ditch bottom of the water diversion blind ditch; the water conduit is provided with a plurality of through holes penetrating through the side wall; a water strainer for wrapping the water conduit is arranged on the outer side of the water conduit; a pebble water filtering layer which fills a gap between the diversion blind ditch and the diversion pipe is arranged in the diversion blind ditch; and a non-woven fabric layer is arranged on one side of the pebble water filtering layer, which is far away from the water conduit.

Through adopting above-mentioned technical scheme, basement rock crack water flows in the leading water pipe through the filtration of cobble drainage layer and strainer, collects to the sump pit by the leading water pipe again in, outside this body of foundation ditch is taken out to ponding in the sump pit through the water pump at last, collects the extraction that the ponding in the sump pit passes through the water pump, reduces the risk that the foundation ditch body gushed water to improve the problem of infiltration hidden danger, improve the structural stability of foundation ditch body. The water diversion blind ditch is provided with a water diversion effect, the pebble water filtering layer filters bed rock fracture water while ensuring the mechanical property of the basic bearing stratum, the non-woven fabric layer reduces fine particles to block the pores of the pebble water filtering layer, and the problem that the fine particles influence the drainage of the pebble water filtering layer is solved.

Optionally, the horizontal height of the end, close to the sump, of the gutter bottom of the diversion blind gutter is lower than the horizontal height of the end, far away from the sump, of the gutter bottom of the diversion blind gutter.

Through adopting above-mentioned technical scheme, the leading pipe is to the interior slope of sump pit, reduces the piling up of leading pipe internal water, improves the drainage efficiency of basement rock gap water to improve the construction speed of engineering.

Optionally, the bottom wall of the foundation pit body is abutted with a cover plate for covering the water collecting pit; a communicating pipe and a vent pipe which are communicated with the inner cavity of the sump are fixed on the side wall of the cover plate, which is far away from the sump; the foundation pit body is provided with a pit opening, and the horizontal heights of the vent pipe and the end part of the communication pipe are not lower than the horizontal height of the pit opening of the foundation pit body; the water pump is provided with a drain pipe; one end of the drain pipe, which is far away from the water pump, penetrates out of the pipe orifice of the communicating pipe, which is far away from the cover plate.

By adopting the technical scheme, when the foundation pit body needs to be closed in subsequent construction, the cover plate limits the water collection pit to be buried, and the water pump continues to collect water and extract the water in the water collection pit. And after the foundation pit body is sealed and the construction requirement is met, the water pump stops pumping accumulated water in the water collecting pit, and the filling material is poured into the communicating pipe to seal the water collecting pit. The introduction of the communicating pipe and the vent pipe can lead the vent pipe to be used as an exhaust hole, an overflow hole and an observation hole when the water collecting pit is closed, and lead the communicating pipe to be used as a grouting hole, thereby improving the construction quality of the closed water collecting pit.

Optionally, a plurality of water stop rings are fixed on the periphery of the communicating pipe and the periphery of the vent pipe.

Through adopting above-mentioned technical scheme, the introduction of stagnant water ring improves the lateral wall that gushes water in the foundation ditch and pass through connecting pipe and breather pipe and gushes out the outside problem of foundation ditch originally.

Optionally, a pebble fixing layer is filled in the water collecting pit; the pebble fixing layer is abutted against one side of the cover plate facing the water collecting pit.

Through adopting above-mentioned technical scheme, the structural stability of cobble fixed bed improvement sump, reduce the inside risk of silt entering water pump in the sump simultaneously, improve the life of water pump.

Optionally, a graded pebble layer is filled between the brick moulding bed reinforcing layer and the local side wall of the foundation pit.

By adopting the technical scheme, the graded pebble layer is introduced to meet the requirements of the bearing layer of the position of the sump on stress, and the structural stability of the sump is improved.

Optionally, the thickness of the graded pebble layer gradually increases from the bottom of the sump to the bottom of the foundation pit body.

By adopting the technical scheme, the graded pebble layer is convenient to fill, the using amount of the graded pebble layer material is reduced, and the construction cost is reduced.

Optionally, the diapire butt joint of foundation ditch body has covered the waterproofing membrane of sump pit and diversion french drain.

Through adopting above-mentioned technical scheme, waterproofing membrane's introduction reduces the risk that tiny granule gets into diversion french drain and sump pit, improves the problem that tiny granule influences the drainage of cobble drainage layer, reduces the inside risk of silt entering water pump in the sump pit simultaneously, improves the life of water pump. And waterproofing membrane reduces the risk of landfill material and basement rock gap water contact when follow-up closed foundation ditch body, improves the problem of infiltration hidden danger, improves the structural stability of the foundation ditch body after the landfill.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the bedrock gap water collected into the water collecting pit by the water guide pipe is extracted by the water pump, so that the risk of water inrush of the foundation pit body is reduced, the problem of water seepage hidden danger is solved, and the structural stability of the foundation pit body is improved;

2. when the foundation pit body is sealed, the cover plate limits the water collection pit to be buried, the water pump continues to pump accumulated water in the water collection pit, after the filling in the foundation pit body meets the construction requirement, filling a filling material into the communicating pipe, sealing the water collection pit, and improving the overall stability of the foundation pit body after the filling;

3. through waterproofing membrane, improve the problem that tiny granule influences the drainage of cobble drainage layer, reduce the inside risk of silt entering water pump in the sump pit simultaneously, improve the life of water pump, the risk of landfill material and bedrock gap water contact when reducing follow-up closed foundation ditch body moreover improves the problem of infiltration hidden danger, improves the overall stability after the foundation ditch body landfill.

Drawings

Fig. 1 is a schematic overall structure diagram of an embodiment of the present application.

FIG. 2 is a schematic view of the position of a penstock according to an embodiment of the present application.

Fig. 3 is a schematic view showing the positions of the cover sheet and the waterproofing membrane according to the embodiment of the present application.

Description of reference numerals: 1. a foundation pit body; 11. a pithead; 12. a sump; 13. water diversion blind ditches; 2. a brick bed course reinforcing layer; 3. grading a pebble layer; 4. a water pump; 41. a drain pipe; 5. a water conduit; 51. a through hole; 52. a water filtering net; 6. a pebble water filtering layer; 7. a non-woven fabric layer; 8. a pebble fixing layer; 9. a cover plate; 91. a communicating pipe; 92. a breather pipe; 93. a water stop ring; 10. a waterproof roll.

Detailed Description

The present application is described in further detail below with reference to figures 1-3.

The embodiment of the application discloses deep basal pit drainage structures. Referring to fig. 1, a deep foundation pit drainage structure includes a foundation pit body 1, and the foundation pit body 1 has a pit opening 11. The bottom wall of foundation ditch body 1 has seted up sump pit 12, and the week side wall of sump pit 12 is built by laying bricks fetal membrane back up 2. The graded pebble layer 3 is filled between the brick moulding bed reinforcing layer 2 and the side wall of the water collection pit 12, and the layer thickness of the graded pebble layer 3 from the bottom of the water collection pit 12 to the bottom of the foundation pit body 1 is gradually increased so as to meet the requirement that the stress at the position of the water collection pit 12 meets the requirement of a bearing layer and improve the structural stability of the water collection pit 12.

Referring to fig. 1, a water pump 4 for leading accumulated water in the sump 12 out of the foundation pit body 1 is placed on the bottom wall of the foundation pit body 1, the water pump 4 is provided with a drain pipe 41, and one end of the drain pipe 41, which is far away from the water pump 4, penetrates out of the pithead 11. It should be noted that, in order to reduce the occurrence of the situation that the water pump 4 cannot operate due to excessive mud deposition, the sump 12 is an open sump, so that constructors can clean up the sludge on the bottom wall of the foundation pit body 1 regularly, and the water pump 4 can operate normally.

Referring to fig. 1, a plurality of water diversion blind ditches 13 are arranged on the bottom wall of the foundation pit body 1 at the periphery of the water collection pit 12, and the number of the water diversion blind ditches 13 can be two, three or four. The horizontal height of the end of the gutter bottom of the diversion blind gutter 13 close to the sump 12 is lower than the horizontal height of the end of the gutter bottom of the diversion blind gutter 13 far away from the sump 12. The bottom of the diversion blind ditch 13 is abutted with a diversion pipe 5 which passes through the end face of the diversion blind ditch 13 and the side wall of the brick bed reinforcement layer 2 and is communicated with the inner cavity of the sump 12, and the diversion pipe 5 can be a high-strength plastic pipe.

Referring to fig. 1 and 2, a plurality of through holes 51 communicated with the inner cavity of the water conduit 5 are formed on the periphery of the water conduit 5, and a water filter net 52 is wrapped on the periphery of the water conduit 5, wherein the water filter net 52 is a dense mesh water filter net. The grooves of the water diversion blind ditches 13 are filled with pebble water filtering layers 6. One side that cobble drainage layer 6 deviates from diversion french drain 13 ditch bottom is supported and has been connect two-layer non-woven fabrics layer 7, and non-woven fabrics layer 7 deviates from one side of cobble drainage layer 6 and flushes with the diapire of foundation ditch body 1, and non-woven fabrics layer 7 reduces the hole that fine particle blockked up cobble drainage layer 6, improves the problem that fine particle influences the drainage of cobble drainage layer 6. The basement rock crack water passes through the filtration of cobble drainage layer 6 and strainer 52, flows in leading pipe 5 through-hole 51, collects again by leading pipe 5 to the sump 12 in, outside foundation ditch body 1 was taken out to ponding in the sump 12 through water pump 4 at last, collects to the ponding in the sump 12 and passes through the extraction of water pump 4, reduces foundation ditch body 1 and gushes out the risk of water.

Referring to fig. 3, a water collection pit 12 is filled with a pebble fixing layer 8, a cover plate 9 covering the water collection pit 12 is abutted to the bottom wall of the foundation pit body 1, and the filling of the pebble fixing layer 8 and the covering of the cover plate 9 are performed before waterproof construction. The pebble fixing layer 8 is abutted to one side, facing the water collecting pit 12, of the cover plate 9, the structural stability of the water collecting pit 12 is improved by the pebble fixing layer 8, meanwhile, the risk that silt in the water collecting pit 12 enters the interior of the water pump 4 is reduced, and the service life of the water pump 4 is prolonged.

Referring to fig. 3, a communicating pipe 91 and a vent pipe 92 communicated with the inner cavity of the sump 12 are welded on one side of the cover plate 9 away from the sump 12. The horizontal height of the end of the communicating pipe 91 and the vent pipe 92 far away from the cover plate 9 is higher than the horizontal height of the pithead 11, so that the communicating pipe 91 and the vent pipe 92 can be used for draining water from the sump 12 when the foundation pit body 1 is closed. The water discharge pipe 41 is arranged through the pipe cavity of the communication pipe 91 and penetrates through the pipe orifice of one end of the communication pipe 91 far away from the cover plate 9. When the sump 12 is closed, the air pipe 92 is used as an exhaust, overflow and observation hole, and the communicating pipe 91 is used as a grouting hole, thereby improving the construction quality of the closed sump 12.

Referring to fig. 3, there is waterproofing membrane 10 bottom wall butt of foundation ditch body 1, waterproofing membrane 10 covers diversion french drain 13 and apron 9, through waterproofing membrane 10, reduces the inside risk of silt entering water pump 4 in the sump pit 12, improves the life of water pump 4, and the risk of landfill material and bedrock gap water contact when reducing follow-up closed foundation ditch body 1 in addition improves the problem of infiltration hidden danger, improves the structural stability of closed back foundation ditch body 1.

Referring to fig. 3, when the cover plate 9 covers the sump 12, the type of the water pump 4, the self-priming pump or the submersible pump 4 is selected according to the water amount, the self-priming pump can extend the drain pipe 41 from the communicating pipe 91 into the sump 12, and the drain pipe can be recovered after the drainage operation performed by the closed foundation pit body 1 is finished, but the discharge capacity is small; the submersible pump 4 has a large discharge capacity, but needs to be embedded in the sump 12 in advance, and the drain pipe 41 extends from the communication pipe 91, and cannot be taken out after the completion of the drainage work performed by the closed foundation pit body 1.

Referring to fig. 3, two water stop rings 93 are arranged on the circumferential sides of the communication pipe 91 and the ventilation pipe 92 along the axis direction of the communication pipe, and when the foundation pit body 1 is closed, the problem that water gushing in the foundation pit body 1 gushes out of the foundation pit through the connecting pipe and the side wall of the ventilation pipe 92 is solved through the water stop rings 93.

The implementation principle of the deep foundation pit drainage structure in the embodiment of the application is as follows: before the foundation pit body 1 is closed, the water pump 4 continuously pumps the bedrock gap water in the water collecting pit 12 to the outside of the foundation pit body 1. When the foundation pit body 1 needs to be closed, the water collection pit 12 is filled with the pebble fixing layer 8, a suitable water pump 4 is selected according to the water quantity in the water collection pit 12, then the drain pipe 41 of the water pump 4 penetrates through the communicating pipe 91, the water pump 4 is placed in the water collection pit 12, the water collection pit 12 is covered through the cover plate 9, then the waterproof coiled material 10 is laid on the bottom wall of the foundation pit body 1, the water diversion blind ditch 13 and the cover plate 9 are covered, and concrete can be poured into the foundation pit body 1. When concreting, water pump 4 continuously extracts the water in sump 12 outside foundation ditch body 1, strengthens the concrete vibration to sump 12 position simultaneously.

After the concrete is finally set, the water pumping operation of the water pump 4 is stopped, the water discharge pipe 41 is removed from the communicating pipe 91, the communicating pipe 91 reserved before is used as a grouting hole, the concrete is injected into the water collection pit 12, the water collection pit 12 is sealed, the reserved vent pipe 92 is used as an exhaust, overflow and observation hole, and the sealing of the foundation pit body 1 and the water collection pit 12 can be completed.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims (8)

1. The utility model provides a deep basal pit drainage structures which characterized in that: comprises a foundation pit body (1); the foundation pit body (1) is provided with a pit opening (11), and the bottom wall of the foundation pit body (1) is provided with a water collecting pit (12); a brick bed film reinforcing layer (2) is arranged on the periphery of the water collecting pit (12); a water pump (4) which leads water out of the foundation pit body (1) is arranged in the water collecting pit (12); the bottom wall of the foundation pit body (1) is provided with a plurality of water diversion blind ditches (13); a water diversion pipe (5) which penetrates through the end face of the water diversion blind ditch (13) and the side wall of the brick bed film reinforcing layer (2) and is communicated with the inner cavity of the water collection pit (12) is arranged at the ditch bottom of the water diversion blind ditch (13); the water conduit (5) is provided with a plurality of through holes (51) penetrating through the side wall; a water strainer (52) for wrapping the water conduit (5) is arranged on the outer side of the water conduit (5); a pebble water filtering layer (6) which fills a gap between the water diversion blind ditch (13) and the water diversion pipe (5) is arranged in the water diversion blind ditch (13); and a non-woven fabric layer (7) is arranged on one side of the pebble water filtering layer (6) far away from the water conduit (5).

2. The deep foundation pit drainage structure of claim 1, wherein: the horizontal height of the end, close to the water collecting pit (12), of the channel bottom of the diversion blind channel (13) is lower than the horizontal height of the end, far away from the water collecting pit (12), of the channel bottom of the diversion blind channel (13).

3. The deep foundation pit drainage structure of claim 1, wherein: the bottom wall of the foundation pit body (1) is abutted with a cover plate (9) covering the water collection pit (12); a communicating pipe (91) and a vent pipe (92) which are communicated with the inner cavity of the sump (12) are fixed on the side wall of the cover plate (9) which deviates from the sump (12); the horizontal heights of the end parts of the vent pipe (92) and the communicating pipe (91) are not lower than the horizontal height of a pit opening (11) of the foundation pit body (1); the water pump (4) is provided with a drain pipe (41); one end of the drain pipe (41) far away from the water pump (4) penetrates out of the pipe opening of the communicating pipe (91) far away from the cover plate (9).

4. The deep foundation pit drainage structure of claim 3, wherein: and a plurality of water stop rings (93) are fixed on the peripheral sides of the communicating pipe (91) and the vent pipe (92).

5. The deep foundation pit drainage structure of claim 3, wherein: a pebble fixing layer (8) is filled in the water collecting pit (12); the pebble fixing layer (8) is abutted against one side, facing the water collecting pit (12), of the cover plate (9).

6. The deep foundation pit drainage structure of claim 1, wherein: and a graded pebble layer (3) is filled between the brick moulding bed reinforcing layer (2) and the side wall of the water collecting pit (12).

7. The deep foundation pit drainage structure of claim 6, wherein: the thickness of the graded pebble layer (3) from the bottom of the water collecting pit (12) to the bottom of the foundation pit body (1) is gradually increased.

8. The deep foundation pit drainage structure of claim 1, wherein: the waterproof roll (10) which covers the water collecting pit (12) and the water diversion blind ditch (13) is abutted to the bottom wall of the foundation pit body (1).

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