CN107938680A - A kind of excavation of foundation pit safe construction method - Google Patents

A kind of excavation of foundation pit safe construction method Download PDF

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Publication number
CN107938680A
CN107938680A CN201711157133.XA CN201711157133A CN107938680A CN 107938680 A CN107938680 A CN 107938680A CN 201711157133 A CN201711157133 A CN 201711157133A CN 107938680 A CN107938680 A CN 107938680A
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CN
China
Prior art keywords
foundation pit
layer
excavation
segment
construction
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201711157133.XA
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Chinese (zh)
Inventor
万飞
周波
刁吉
韩立国
陈彦君
房志华
李慧英
刘平
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
CHONGQING TRAFFIC BUILDING (GROUP) Co Ltd
Original Assignee
CHONGQING TRAFFIC BUILDING (GROUP) Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by CHONGQING TRAFFIC BUILDING (GROUP) Co Ltd filed Critical CHONGQING TRAFFIC BUILDING (GROUP) Co Ltd
Priority to CN201711157133.XA priority Critical patent/CN107938680A/en
Publication of CN107938680A publication Critical patent/CN107938680A/en
Pending legal-status Critical Current

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Classifications

    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D17/00Excavations; Bordering of excavations; Making embankments
    • E02D17/02Foundation pits
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D19/00Keeping dry foundation sites or other areas in the ground
    • E02D19/06Restraining of underground water
    • E02D19/10Restraining of underground water by lowering level of ground water

Abstract

The present invention provides a kind of excavation of foundation pit safe construction method, it is related to field of engineering building.The present invention is carried out using cubic metre of earth and stone longitudinal divisions, vertical layered bench cut order, earthwork stone is carried out reasonably to be segmented and be layered, first carry out first segment first layer earthwork evacuation, the first segment second layer and second segment first layer earth excavation are carried out again, followed by first segment third layer, the second segment second layer and the 3rd section of first layer earth excavation.Excavated with the sequence of construction of the present invention, can effectively prevent from collapsing, ensure that the stability and security of construction.

Description

A kind of excavation of foundation pit safe construction method
Technical field
The present invention relates to field of engineering building, more particularly to a kind of excavation of foundation pit safe construction method.
Background technology
With the continuous development of urban architecture, various types of engineering constructions, such as High-Rise Building Deep Foundation, basement or The underground structures such as person's track, station are required to carry out deep pit digging.Base pit engineering have quantities is big, technical difficulty is high, The characteristics of unpredictable element is more, and itself quantities of some engineerings is larger, surrounding enviroment are complicated, greening, pipeline transplanting, Move and change outside the reason such as more complicated, while also to take into account other constructions around.Earth excavation supporting is foundation pit construction in foundation pit construction In critical process, while be also deep-foundation pit engineering the principal risk stage.
Space geometry size and building enclosure during excavation per secondary clearing step excavation excavate part Without support open-assembly time, there is obvious correlation with foundation pit enclosure pile body and surrounding formations displacement, which reflects in excavation of foundation pit The regularity of tau-effect.Therefore, tau-effect is made full use of during excavation, reasonable arrangement excavation sequence, controls the absolute altitude of shoveling, Spray anchor closing in time is to ensure that foundation pit enclosure is stable, improves the key of engineering construction quality.
The content of the invention
For the drawbacks described above and problem of the prior art, the purpose of the embodiment of the present invention is to provide a kind of high-efficiency environment friendly, peace Stable excavation method entirely.
In order to achieve the above object, the present invention provides following technical solution:
A kind of excavation of foundation pit safe construction method, using cubic metre of earth and stone longitudinal divisions, vertical layered bench cut order Carry out, specifically include following construction procedure:
Step 1: first segment first layer earthwork evacuation:Bituminous paving is abolished using hydraulic hammer, excavates capping beam model first Enclose the interior soil body, after the construction for completing capping beam, then excavate the soil body to first row prestress anchorage cable below 50mm, carry out anchor cable and The linked network of panel, spray concrete, anchor bolt construction, first layer soil excavation are highly about 2m between stake, and earthwork entrucking is transported outward;
Step 2: the first segment second layer and second segment first layer earth excavation:Reach intensity in first segment first layer supporting Afterwards, muck haulage is dug carrying out the second layer with first segment and second segment intersection kerve in order to which digging machine and slag waggon enter first segment, During excavation of foundation pit its vertically and horizontally upper side slope with 1:2 gradient slope, is excavated to 0.5m below second layer Anchor cable-rod, and in time Panel, anchor bolt construction between second layer anchor cable, stake are carried out, then excavates second segment first layer;
Step 3: first segment third layer, the second segment second layer and the 3rd section of first layer earth excavation:In second segment first layer After supporting reaches intensity, then proceed by first segment third layer earth excavation and supporting;Followed by second segment second layer soil Square excavation and support;Finally carry out the 3rd section of first layer earth excavation and supporting.
Further, before step 1, further include, sump and intercepting ditch, composition earth's surface row are provided with the outside of foundation pit Water system.
Further, the top drainage system includes:In foundation pit outer, foundation pit surrounding sets intercepting ditch, prevents surface water Flow to foundation pit;Set temporary drain to carry out water guide in foundation pit along foundation pit surrounding in foundation pit, and one is set every 30-40m The sump of a diameter of 0.8-1m, it is outer using water pump extraction hole after underground water is flowed into sump in foundation pit, sink by setting pot Shallow lake heel row enters municipal pipeline.
Further, during excavation construction, spoir stack should the distance away from foundation pit top line be 1 times excavation of foundation pit Depth, building enclosure overcharge on ground must not exceed 20Kpa.
Further, riding track setting is further included, head fall is set in foundation pit is 12%, cross fall is 2% to go out Slag riding track, for dregs to be transported outward.
Further, step 4 is further included after step 3, the step 4 is:According to Step 1: step 2 and step Three sequence of construction circulation is excavated to substrate, and when cutting depth is higher than 6m, drag-out slag car detours to riding track, is carried out through riding track outside dregs Fortune.
Compared with prior art, its advantage is excavation of foundation pit safe construction method provided by the invention:The present invention Mainly carried out using cubic metre of earth and stone longitudinal divisions, vertical layered bench cut order, earthwork stone is carried out according to actual conditions Equitable subsection and layering, and needed when excavating according to Practical Project situation, the length of every section of earth excavation is strictly controlled, on Lower two layer soil body intersections should all slope, it is impossible to backbreaks into vertical plane, effectively prevents from collapsing, ensure that the stability and peace of construction Quan Xing.In addition, being excavated using staged and layered formula, beneficial to the slope stability on stringent control foundation pit both sides, carried out in time after excavation Supporting, while also ensure that the safety of construction personnel.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing There is attached drawing needed in technology description to be briefly described, it should be apparent that, drawings in the following description are only this Some embodiments of invention, for those of ordinary skill in the art, without having to pay creative labor, may be used also To obtain other attached drawings according to these attached drawings.
Fig. 1 is the earth excavation schematic diagram of step 1 in excavation of foundation pit safe construction method of the invention;
Fig. 2 is the earth excavation schematic diagram of step 2 in excavation of foundation pit safe construction method of the invention;
Fig. 3 is the earth excavation schematic diagram of step 3 in excavation of foundation pit safe construction method of the invention;
Embodiment
Below in conjunction with the embodiment of the present invention, technical scheme is clearly and completely described, it is clear that Described embodiment is only part of the embodiment of the present invention, instead of all the embodiments.Based on the implementation in the present invention Example, those of ordinary skill in the art's all other embodiments obtained without creative efforts, belongs to The scope of protection of the invention.
According to Fig. 1-3, excavation of foundation pit safe construction method of the invention, using cubic metre of earth and stone longitudinal divisions, vertical point The bench cut order of layer carries out, and specifically includes following construction procedure:
Step 1: first segment first layer earthwork evacuation S101:Bituminous paving is abolished using hydraulic hammer, excavates bear down on one first The soil body in the range of beam, after the construction for completing capping beam, then excavates 50mm below the soil body to first row prestress anchorage cable, carries out anchor The linked network of panel, spray concrete, anchor bolt construction, first layer soil excavation are highly about 2m between rope and stake, and earthwork entrucking is transported outward;
Before step 1, further include, sump and intercepting ditch are provided with the outside of foundation pit, form top drainage system, this Sample can effectively avoid hole other places from showing that water is flowed into foundation pit.
Above-mentioned top drainage system includes:In foundation pit outer, foundation pit surrounding sets width 300m, the intercepting ditch of depth 400m, prevents Insulated stream is to foundation pit;Along foundation pit surrounding in foundation pit, and away from foundation pit enclosure structure 1m at, set temporary drain carry out foundation pit Interior water guide, the gradient 0.4%, and the sump of one a diameter of 0.8m is set every 30m, depth is suitably set with the intensification of shoveling Put, scene adjusts gutter and sump section size according to actual amount of water, and underground water flows into rear in sump use in foundation pit Water pump extraction hole is outer, enters municipal pipeline by setting pot precipitation heel row.
Step 2: the first segment second layer and second segment first layer earth excavation S102:Reach in first segment first layer supporting After intensity, carrying out the second layer and digging to transport in order to which digging machine and slag waggon enter first segment with first segment and second segment intersection kerve Soil, during excavation of foundation pit its vertically and horizontally upper side slope with 1:2 gradient slope, is excavated to 0.5m below second layer Anchor cable-rod, and Panel, anchor bolt construction between second layer anchor cable, stake are carried out in time, then excavate second segment first layer;
Step 3: first segment third layer, the second segment second layer and the 3rd section of first layer earth excavation S103:In second segment After one layer of supporting reaches intensity, then proceed by first segment third layer earth excavation and supporting;Followed by second segment second Layer earth excavation and supporting;Finally carry out the 3rd section of first layer earth excavation and supporting.
During excavation construction, spoir stack should the distance away from foundation pit top line be 1 times excavation of foundation pit depth, go along with sb. to guard him Structural floor overload must not exceed 20Kpa.
Further included in construction riding track setting, in foundation pit set head fall be 12%, the horse of slagging tap that cross fall is 2% Road, for dregs to be transported outward.
Specifically, because the place of construction site limits, the dregs of more than 6m is more than for cutting depth, slag releasing channel is intended adopting The mode taken is that the construction that a wide 7m is formed by the big mileage end of the left line of foundation pit is slagged tap riding track, and riding track head fall is 12%, horizontal To the gradient 2%, gutter and sump are set on the inside of riding track.
Because riding track is as interim sidewalk of slagging tap, heavy vehicle and construction machinery are passing frequently, and have side slope to be formed, to protect Construction personnel, vehicle and mechanical equipment safety are demonstrate,proved, should strengthen safeguard procedures in the inside and outside riding track of foundation pit.
Safety of workers is ensured using steel pipe guard rail for 50 meters of flume section top of the slope, faces side 50cm.For in foundation pit Protected on the outside of riding track at top of the slope in the form of waveform Anti-collision railing, railing is arranged at slope edges 50cm;Lean on On the inside of the riding track of building enclosure, using flexible protection alarm column, set at fender post 50cm.
Step 4 is further included after above-mentioned steps three, step 4 is:According to Step 1: the construction of step 2 and step 3 is suitable Sequence circulation is excavated to substrate, and when cutting depth is higher than 6m, drag-out slag car detours to riding track, and dregs outward transport is carried out through riding track.
The total earth and stone digging amount of foundation pit of the present embodiment is 25.7 ten thousand m3, 8.2 ten thousand m of earth volume3, the cubic meter of stone is 17.5 ten thousand m3, examine Consider the needs of agent structure backfill, with reference to construction plan arrangement, carry out rational cut-fill transition, construction place or near Interim cinder field planning temporary heap soil site, for storing backfill, backfill quantity total amount is 2.25 ten thousand m3.The base of the present embodiment To cheat as open-cut, digging mode is using vertical layered, and slope is drawn in longitudinal direction, and riding track is set, and mechanical engagement dumper is unearthed mode, from Unload and transport foundation pit through riding track into luggage soil directly out of foundation pit.
The above description is merely a specific embodiment, but protection scope of the present invention is not limited thereto, any Those familiar with the art the invention discloses technical scope in, change or replacement can be readily occurred in, should all be contained Cover within protection scope of the present invention.Therefore, protection scope of the present invention answers the scope of the claims of being subject to.

Claims (6)

  1. A kind of 1. excavation of foundation pit safe construction method, it is characterised in that:Using cubic metre of earth and stone longitudinal divisions, vertical layered staged Sequence of excavation carries out, and specifically includes following construction procedure:
    Step 1: first segment first layer earthwork evacuation:Bituminous paving is abolished using hydraulic hammer, is excavated first in the range of capping beam The soil body, after the construction for completing capping beam, then excavates 50mm below the soil body to first row prestress anchorage cable, carries out between anchor cable and stake The linked network of panel, spray concrete, anchor bolt construction, first layer soil excavation are highly about 2m, and earthwork entrucking is transported outward;
    Step 2: the first segment second layer and second segment first layer earth excavation:After first segment first layer supporting reaches intensity, With first segment with second segment intersection kerve in order to which digging machine and slag waggon enter first segment and carry out second layer digging muck haulage, foundation pit is opened During digging its vertically and horizontally upper side slope with 1:2 gradient slope, is excavated to 0.5m below second layer Anchor cable-rod, and carries out in time Two layers of panel between anchor cable, stake, anchor bolt construction, then excavate second segment first layer;
    Step 3: first segment third layer, the second segment second layer and the 3rd section of first layer earth excavation:In second segment first layer supporting After reaching intensity, then proceed by first segment third layer earth excavation and supporting;Opened followed by the second segment second layer earthwork Digging and supporting;Finally carry out the 3rd section of first layer earth excavation and supporting.
  2. A kind of 2. excavation of foundation pit safe construction method according to claim 1, it is characterised in that:Before step 1, also wrap Include, sump and intercepting ditch are provided with the outside of foundation pit, form top drainage system.
  3. A kind of 3. excavation of foundation pit safe construction method according to claim 2, it is characterised in that:The top drainage system Including:In foundation pit outer, foundation pit surrounding sets intercepting ditch, prevents insulated stream to foundation pit;Set and face along foundation pit surrounding in foundation pit When gutter carry out foundation pit in water guide, and every 30-40m set an a diameter of 0.8-1m sump, base mine water It is outer using water pump extraction hole after flowing into sump, enter municipal pipeline by setting pot precipitation heel row.
  4. A kind of 4. excavation of foundation pit safe construction method according to claim 1, it is characterised in that:During excavation construction, Spoir stack should the distance away from foundation pit top line be 1 times excavation of foundation pit depth, building enclosure overcharge on ground must not exceed 20Kpa。
  5. A kind of 5. excavation of foundation pit safe construction method according to claim 1, it is characterised in that:Riding track setting is further included, In foundation pit set head fall be 12%, the riding track of slagging tap that cross fall is 2%, for dregs to be transported outward.
  6. A kind of 6. excavation of foundation pit safe construction method according to claim 5, it is characterised in that:Further included after step 3 Step 4, the step 4 are:According to Step 1: the circulation of the sequence of construction of step 2 and step 3 is excavated to substrate, excavation is deep When degree is higher than 6m, drag-out slag car detours to riding track, and dregs outward transport is carried out through riding track.
CN201711157133.XA 2017-11-20 2017-11-20 A kind of excavation of foundation pit safe construction method Pending CN107938680A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201711157133.XA CN107938680A (en) 2017-11-20 2017-11-20 A kind of excavation of foundation pit safe construction method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201711157133.XA CN107938680A (en) 2017-11-20 2017-11-20 A kind of excavation of foundation pit safe construction method

Publications (1)

Publication Number Publication Date
CN107938680A true CN107938680A (en) 2018-04-20

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105887889A (en) * 2016-04-20 2016-08-24 中铁上海工程局集团有限公司 Excavation construction method for super-wide low-permeability silty deep foundation pit
CN106759366A (en) * 2017-01-25 2017-05-31 北京市政建设集团有限责任公司 The construction method that soil excavation is arranged with packway in a kind of foundation ditch
CN106869151A (en) * 2017-02-20 2017-06-20 安徽新建控股集团有限公司 A kind of bridge construction method of deep foundation ditch
CN107100171A (en) * 2017-05-19 2017-08-29 中国水利水电第四工程局有限公司 A kind of foundation ditch construction method
CN107119691A (en) * 2017-06-22 2017-09-01 中交二航局第四工程有限公司 One kind is applied to the square deep basal pit of the high pressure-bearing of rich water sand gravel layer and its excavation method
CN107190752A (en) * 2017-05-31 2017-09-22 郑州安源工程技术有限公司 A kind of design and construction method of the recyclable square-section Row Piles Supporting Structure of flexible compound antiseepage assembled

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105887889A (en) * 2016-04-20 2016-08-24 中铁上海工程局集团有限公司 Excavation construction method for super-wide low-permeability silty deep foundation pit
CN106759366A (en) * 2017-01-25 2017-05-31 北京市政建设集团有限责任公司 The construction method that soil excavation is arranged with packway in a kind of foundation ditch
CN106869151A (en) * 2017-02-20 2017-06-20 安徽新建控股集团有限公司 A kind of bridge construction method of deep foundation ditch
CN107100171A (en) * 2017-05-19 2017-08-29 中国水利水电第四工程局有限公司 A kind of foundation ditch construction method
CN107190752A (en) * 2017-05-31 2017-09-22 郑州安源工程技术有限公司 A kind of design and construction method of the recyclable square-section Row Piles Supporting Structure of flexible compound antiseepage assembled
CN107119691A (en) * 2017-06-22 2017-09-01 中交二航局第四工程有限公司 One kind is applied to the square deep basal pit of the high pressure-bearing of rich water sand gravel layer and its excavation method

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* Cited by examiner, † Cited by third party
Title
WALCY123: "地铁车站明挖基坑专项方案(专家论证汇报PPT)", 《百度文库》 *

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Application publication date: 20180420

RJ01 Rejection of invention patent application after publication