CN103898920B - Foundation ditch falls, water discharge method - Google Patents
Foundation ditch falls, water discharge method Download PDFInfo
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- CN103898920B CN103898920B CN201210581475.5A CN201210581475A CN103898920B CN 103898920 B CN103898920 B CN 103898920B CN 201210581475 A CN201210581475 A CN 201210581475A CN 103898920 B CN103898920 B CN 103898920B
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Abstract
The invention provides that a kind of foundation ditch falls, water discharge method, be applied to the foundation pit system in closed state, comprising: in foundation ditch, arrange without sand large open well, without water plug being set in sand large open well, the water inlet of water plug is wrapped up with fabric; Along with without the parallel direction of sand large open well, foundation ditch is punched, around without sand large open well, form space; Fill space and form filter course; Earth excavation is to substrate, and the lower that falls in post-cast strip is arranged french drain and sump. Foundation ditch provided by the invention falls, water discharge method, adopt Large Diameter Pipeline without sand large open well as base pit dewatering equipment, and the water inlet of the tube wall without sand large open well and water plug is carried out to specially treated, avoid being stopped up by caustic sludge soil without sand large open well in Precipitation Process, in addition, in the process of excavation of foundation pit, substrate post-cast strip location arrangements french drain and sump, form provisional bright drainage system, thereby the crystallization water of having avoided dewatering well to fail to extract out overflows the situation that causes the water softening of substrate chance.
Description
Technical field
The present invention relates to civil engineering work field, relate in particular to that foundation ditch under alkaline residue environment falls, water discharge method.
Background technology
Along with the continuous expansion of city size, soil, down town is day by day in short supply, and the layout in city starts to occurChange, a large amount of heavy duty industrial, the chemical enterprises in center, city shifts to the border district in city gradually, by originalFactory area be transformed into central business district (centralbusinessdistrict). Therefore increasing chemical industryBecome the building site of large-scale grassroot project, in landfill place, discarded object produces construction LandfillsRaw certain difficulty, particularly for the base pit dewatering in the discarded place of chemistry.
The generally base pit dewatering 6 meters of left and right for cutting depth, southern area adopts Application of light well point precipitation,It is adapted at using in the relatively low clayed soil of infiltration coefficient. But northern area, particularly Beijing-Tianjin districtTerritory soil property is taking sandy soil as main, and conventional way adopts without sand large open well, and it is adapted at cohesive soil, sand etc. and appointsBase pit dewatering in what soil property situation, applicability is very wide, and therefore these two kinds of precipitation methods can meet at presentBoth at home and abroad great majority excavation dark 6 meters with interior base pit dewatering requirement. But in Subgrade soil situation, exampleAs the foundation ditch under chemical industry Landfills new construction base pit dewatering, particularly caustic sludge soil environment on the groundPrecipitation, because caustic sludge soil becomes stream to mould state under normal condition, moisture content is high, and infiltration coefficient is little, at precipitationIn process, when underground water is drawn out of, a large amount of caustic sludge soils can be taken out of, and the precipitation apparatus of pipe with small pipe diameter very easilyBlocked, theoretical calculating dewatering effect and actual dewatering effect differ larger; And caustic sludge soil is extremely unstable,After disturbance, easily decomposite white liquid, conventional precipitation method can not reach good implementation result.
Summary of the invention
Technical problem to be solved by this invention has been to provide that foundation ditch falls, water discharge method, to solve Precipitation ProcessThe problem that middle pipe well is stopped up by soil.
In order to solve the problems of the technologies described above, technical scheme of the present invention is: a kind of foundation ditch falls, water discharge method,Be applied to the foundation pit system in closed state, comprise: in foundation ditch, arrange without sand large open well, described inWithout water plug being set in sand large open well, the water inlet of described water plug is wrapped up with fabric; Edge and described nothingThe parallel direction of sand large open well is punched to described foundation ditch, forms space described around without sand large open well;Fill described space and form filter course; Earth excavation is to substrate, and the lower that falls in post-cast strip is arranged french drain and catchmentedWell.
Further, woven bag is laid in described french drain outside.
Further, described space and described cross section without sand large open well are annular.
Further, described in the aperture ratio in described space without the large 200mm of well casing diameter of sand large open well.
Further, sealing steel loop casing is set described on without sand large open well, in described sealing steel loop casing,Outer ring all arranges double-deck sealing steel loop.
Further, adopt irregular gravel to fill described space and form filter course.
Foundation ditch provided by the invention falls, water discharge method, adopt Large Diameter Pipeline without sand large open well as base pit dewateringEquipment, and the water inlet of the tube wall without sand large open well and water plug has been carried out to specially treated, avoid precipitationIn process, stopped up by caustic sludge soil without sand large open well, in addition, in the process of excavation of foundation pit, position, substrate post-cast stripPut and arrange french drain and sump, form provisional bright drainage system, thereby avoided dewatering well to fail to extract outThe crystallization water overflow and cause substrate to meet the situation of water softening.
Brief description of the drawings
Fig. 1 is for the foundation ditch that the embodiment of the present invention provides falls, the steps flow chart schematic diagram of water discharge method;
The signal of the plan structure without sand large open well, french drain and sump that Fig. 2 a provides for the embodiment of the present inventionFigure;
The signal of the cross-section structure without sand large open well, french drain and sump that Fig. 2 b provides for the embodiment of the present inventionFigure;
The sealing steel loop casing that Fig. 3 a provides for the embodiment of the present invention and the signal of the facade structures of sealing steel loopFigure;
The sealing steel loop casing that Fig. 3 b provides for the embodiment of the present invention and the signal of the cross-section structure of sealing steel loopFigure.
Detailed description of the invention
A kind of foundation ditch the present invention being proposed below in conjunction with the drawings and specific embodiments falls, water discharge method is done into oneStep describes in detail. According to the following describes and claims, advantages and features of the invention will be clearer. NeedIllustrate, accompanying drawing all adopts very the form of simplifying and all uses non-ratio accurately, only for convenient,The object of the aid illustration embodiment of the present invention lucidly.
Core concept of the present invention is, foundation ditch provided by the invention falls, water discharge method, adopts Large Diameter Pipeline, and the water inlet of the tube wall without sand large open well and water plug is entered as base pit dewatering equipment without sand large open wellGo specially treated, avoided being stopped up by caustic sludge soil without sand large open well in Precipitation Process, in addition, at excavation of foundation pitProcess in, substrate post-cast strip location arrangements french drain and sump, form provisional bright drainage system, fromAnd the crystallization water of having avoided dewatering well to fail to extract out overflows the situation that causes the water softening of substrate chance.
Fig. 1 is for the foundation ditch that the embodiment of the present invention provides falls, the steps flow chart schematic diagram of water discharge method. As Fig. 1Shown in, the foundation ditch that the embodiment of the present invention provides falls, water discharge method, comprises the following steps:
S11, in foundation ditch arrange without sand large open well, described without in sand large open well, water plug being set, described in take outThe water inlet of water device is wrapped up with fabric;
Punch to described foundation ditch without the parallel direction of sand large open well with described in S12, edge, described large without sandMouth well forms space around;
S13, fill described space and form filter course;
S14, earth excavation are to substrate, and the lower that falls in post-cast strip is arranged french drain and sump.
In the present embodiment, described water plug is the water pump that draws water, at the water inlet of the water pump that draws water fabric bagPrick, this fabric is double gauze. Two-layer woven bag is laid in described french drain outside.
The signal of the plan structure without sand large open well, french drain and sump that Fig. 2 a provides for the embodiment of the present inventionFigure; The signal of the cross-section structure without sand large open well, french drain and sump that Fig. 2 b provides for the embodiment of the present inventionFigure. With reference to Fig. 2 a and Fig. 2 b, the lower 6 meters of left and right foundation ditches of caustic sludge soil environment fall, drainage system is corresponding executesThe basic step of work is: foundation pit enclosure structure and Construction of Engineering Pile are complete, and foundation ditch is in closed state, and concreteIntensity reaches 70% of design strength, and every 20 meters of layouts, flatly without sand large open well 21, avoid being arranged in sumpWith stub position, be arranged in flat position, to retain the step-down of dewatering well during as structure construction as far as possibleWell. Adopt diving to be drilled to hole, without sand large open well 21 around, form space 22, described space 22 and described inCross section without sand large open well 21 is annular, without sand large open well 21 described in the aperture ratio in described space 22The large 200mm of well casing diameter, in the present embodiment, sets and adopts diving of external diameter 700mm without sand large open well 21Water drilling, and place the non-fine concrete pipe well that external diameter is 500mm, and adjust pipe well and be positioned at pore-forming center. AdoptFill described space 22 with irregular gravel and form filter course, described filter course can be avoided without sand large open well 21The borehole wall blocked, tamp by clay filled 1 meter of left and right of subsurface, the double-deck yarn in suction pump water inlet positionCloth wrapping. Without the interior water plug 26 that arranges of sand large open well 21.
Observe without the interior groundwater level of sand large open well 21, as stop pumping, in well, water level still can be stabilized in designThe following 1 meter of position of substrate absolute altitude, can earth excavation. Earth excavation is to substrate, utilizes design post-cast stripThe lower that falls, hand excavation's minor groove, and lay 30mm rubble, as french drain 23, foundation ditch is carried out to bright draining,The wide 500mm of french drain 23 end face, bottom surface is wide is 300mm, and french drain 23 arranges a collection every 20 metersWell 24, the french drain 23 of layout and sump 24 are as bright drainage system, and double-deck volume laid in french drain 23 outsidesKnit bag.
The sealing steel loop casing that Fig. 3 a provides for the embodiment of the present invention and the facade structures schematic diagram of sealing steel loop;The sealing steel loop casing that Fig. 3 b provides for the embodiment of the present invention and the cross-sectional view of sealing steel loop. GinsengAccording to Fig. 3 a and Fig. 3 b, every 1000mm2Retain the step-down as the structure construction stage without sand large open well flatlyWell, arranges sealing steel loop casing 25 described on without sand large open well 21, and the diameter of sealing steel loop casing 25 is450mm, the high 100mm of aspect ratio base plate thickness, wall thickness is 20mm, in described sealing steel loop casing 25,Outer ring all arranges double-deck sealing steel loop 31, in building bed course, the sealing steel loop 31 of customization is fixed onOn bed course, steel loop width is 100mm, and thickness is 15mm.
Belong to heavy caliber precipitation apparatus without sand large open well 21, its relatively large caliber has guaranteed that dewatering well is fallingDuring water, shaft bottom is not stopped up by caustic sludge soil, and the gravel in caliber outside is filled filter course and drawn water and pumps into waterThe double gauze of mouth wrapping has all played the effect that good anti-mud stops up, and avoids falling because caliber is blockedWater effect declines; Earth excavation, to substrate, is arranged french drain 23 and sump 24 under position, post-cast strip, hasThe unstable moisture decompositing of eliminating caustic sludge soil calcium carbonate crystal of effect, has avoided because substrate ponding causesCaustic sludge soil is met water softening, occurs that machinery sink, the accident of slope collapse.
Obviously, those skilled in the art can carry out various changes and modification and not depart from the present invention inventionSpirit and scope. Like this, if of the present invention these amendment and modification belong to the claims in the present invention andWithin the scope of equivalent technologies, the present invention be also intended to comprise these change and modification interior.
Claims (6)
- Foundation ditch fall, a water discharge method, be applied to the foundation pit system in closed state, its spyLevy and be, comprising:In foundation ditch arrange without sand large open well, described without in sand large open well, water plug being set, described in draw waterThe water inlet of device is wrapped up with fabric;Along described foundation ditch being punched without the parallel direction of sand large open well with described, described without large mouthful of sandWell forms space around;Fill described space and form filter course;Earth excavation is to substrate, and the lower that falls in post-cast strip is arranged french drain and sump.
- Foundation ditch according to claim 1 fall, water discharge method, it is characterized in that, outside described french drainSide is laid woven bag.
- Foundation ditch according to claim 1 fall, water discharge method, it is characterized in that, described space withThe described cross section without sand large open well is annular.
- Foundation ditch according to claim 1 fall, water discharge method, it is characterized in that, described spaceDescribed in aperture ratio without the large 200mm of well casing diameter of sand large open well.
- Foundation ditch according to claim 1 fall, water discharge method, it is characterized in that, described without sandSealing steel loop casing is set on large open well, and the inside and outside circle of described sealing steel loop casing all arranges double-deck water-stopping steelRing.
- Foundation ditch according to claim 1 fall, water discharge method, it is characterized in that, adopt irregularGravel is filled described space and is formed filter course.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210581475.5A CN103898920B (en) | 2012-12-27 | 2012-12-27 | Foundation ditch falls, water discharge method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210581475.5A CN103898920B (en) | 2012-12-27 | 2012-12-27 | Foundation ditch falls, water discharge method |
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| CN103898920A CN103898920A (en) | 2014-07-02 |
| CN103898920B true CN103898920B (en) | 2016-05-04 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104314090A (en) * | 2014-08-29 | 2015-01-28 | 中铁八局集团建筑工程有限公司 | Deep foundation pit bedrock drainage culvert and drainage system and drainage construction method thereof |
| CN114737584A (en) * | 2022-04-21 | 2022-07-12 | 中国十七冶集团有限公司 | Scouring prevention process for basement foundation pit slope toe in water-rich sandy soil area in rainy season |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2004068485A (en) * | 2002-08-08 | 2004-03-04 | Sakamoto Shokai:Kk | Method of forcedly removing surface water in deep well construction method |
| CN201176596Y (en) * | 2008-06-05 | 2009-01-07 | 上海广联建设发展有限公司 | Pipe well simultaneous for draining and pressure-reduction dewatering |
| CN101705691B (en) * | 2009-10-30 | 2011-07-20 | 南通建工集团股份有限公司 | Construction method of dewatering well under foundation slab in foundation pit |
| CN101768976B (en) * | 2009-12-29 | 2011-04-06 | 中建城市建设发展有限公司 | Base pit dewatering and water saving device and construction method thereof |
| CN102839691B (en) * | 2011-06-22 | 2015-04-15 | 南通海洲建设集团有限公司 | Quick sealing method and device for sandless cement pipe deep well dewatering wellhead |
| CN202627006U (en) * | 2012-05-05 | 2012-12-26 | 中国十七冶集团有限公司 | Plugging steel sleeve of dewatering well under basement floor |
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