CN101408023A - Method for supporting and protecting row pile pit - Google Patents
Method for supporting and protecting row pile pit Download PDFInfo
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- CN101408023A CN101408023A CNA2008101529252A CN200810152925A CN101408023A CN 101408023 A CN101408023 A CN 101408023A CN A2008101529252 A CNA2008101529252 A CN A2008101529252A CN 200810152925 A CN200810152925 A CN 200810152925A CN 101408023 A CN101408023 A CN 101408023A
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Abstract
The invention discloses a supporting method of a pile foundation pit, the pile is the single-row pile inclining to the outside of the foundation pit, and the method comprises the following steps: (a) according to site conditions and computational analysis, the angle of inclination of the pile, the pile length and the pile body strength, the foundation pit supporting structure, and the excavation progression of the foundation pit are determined; (b) the piles are constructed; (c) the foundation pit supporting structure is constructed; (d) the foundation pit is excavated; and (e) clearing and leveling are carried out to the bottom of the foundation pit, and the construction work of the next step is carried out. The method can reduce the displacement of the pile bolck, reduce the bending moment of the pile body and lower construction cost to a large extent, also can increase excavation depth and reduce the possibility of the occurrence of overturning damage.
Description
Technical field
The present invention relates to the foundation field, particularly a kind of method of utilizing campshed to carry out pattern foundation pit supporting structure.
Background technology
Cluster Bracing Structure has plurality of advantages such as construction technology is simple, cost is low, layout is flexible, is one of most widely used pattern foundation pit supporting structure form in present home and abroad.Campshed supporting and protection structure can be divided into cantilevered, draw anchor formula and three kinds of supporting types of inner bearing type., geological conditions more shallow when excavation of foundation pit better, when the ground requirement of settlement control is not high outside supporting and protection structure distortion and the hole, can adopt cantilevered campshed support form.The campshed supporting can also be in conjunction with supporting or anchor rod anchored raising support capacity in the hole.When the excavation of foundation pit area is big, the ground settlement request is higher outside supporting and protection structure distortion and the hole, can adopt inner bearing type campshed support form in soft clay area.When the foundation ditch soil condition can be provided with anchor pole, and surrounding enviroment are influenced when little, also can adopt and draw anchor formula campshed support form.
Present campshed supporting and protection structure all adopts vertical stake, and the FAQs that exists when utilizing vertical campshed to carry out pattern foundation pit supporting structure is: the stake top is easy to generate big displacement, causes the outer ground of a back foundation ditch to produce moderate finite deformation, jeopardizes surrounding environment; When the insufficient strength of stake, cause slope protection pile to fracture easily and make instability of foundation pit; The degree of depth that foundation ditch can excavate is less, topples easily when cutting depth increases.
A spot of taper piles such as one or two are widely used in harbour, bridge, send in the engineering pile foundations such as electric iron tower, can adopt and hang up and beat preformed pile, bored pile, telescoping screw and be drilled to multiple job practicess such as stake and hand excavated pile, be the construction technology of a comparative maturity.
Summary of the invention
The present invention can reduce a top displacement to a great extent for the technical problem that exists in the solution known technology provides a kind of, reduce the pile body moment of flexure, reduce construction costs, the method for supporting and protecting row pile pit that increases cutting depth and the possibility of the destruction of toppling is reduced.
The technical scheme that the present invention takes for the technical problem that exists in the solution known technology is: a kind of method for supporting and protecting row pile pit, described campshed are the single campsheds that tilts to the foundation ditch outside, and this method may further comprise the steps:
(a) according to site condition and computational analysis, determine the campshed angle of inclination, determine stake long with pile strength, determine foundation pit supporting construction, determine the excavation progression of foundation ditch;
(b) construction campshed;
(c) construction foundation pit supporting and protection structure;
(d) excavation pit;
(e) end, foundation ditch hole, cleared up, flattens, and carry out next step construction working.
The angle of inclination of described campshed is: 1～15 °.
Described campshed is bored pile or preformed pile or cased bore-bole castinplace pile.
Described foundation pit supporting construction is supporting of cantilever pile formula or the supporting of inner bearing type formula or draws the supporting of anchor formula.
Advantage and good effect that the present invention has are: the present invention is the improvement to common vertical row of piles supporting, inclination campshed with suitable angle replaces vertical campshed, according to site condition and security and stability checking computation results, the campshed integral body that makes pattern foundation pit supporting structure is to a certain special angle of foundation ditch outside inclination.This kind method has overcome a lot of deficiencies of vertical campshed supporting, can reduce a top displacement to a great extent, reduces the pile body moment of flexure, reduces construction costs, increases cutting depth and the possibility of destroying of toppling is reduced.The present invention compares with prior art and has the following advantages: this method can reduce a top displacement to a great extent under the identical situation of cutting depth, a back ground deformation is reduced greatly, avoid surrounding environment is damaged, simultaneously can reduce the pile body moment of flexure, the pile body quantity of reinforcement is significantly reduced, thereby the reduction construction costs has very big economic benefit; When stake long with stake design strength when identical with common campshed, can make the cutting depth increase, have technological value preferably; The possibility of destroying reduces because excavation face tilt, foundation ditch topple, and helps the safety of base pit engineering.Because the advantage of above raked pile supporting, the base pit engineering that originally may need to adopt the inner bearing type supporting or draw the supporting of anchor formula, only utilize the cantilever pile supporting just can meet design requirement this moment, thereby make design and construction easier, and economical with materials reduces construction costs.Be applicable to the base pit engineering that uses campshed to carry out supporting, with respect to vertical method for supporting and protecting row pile pit, using the present invention can increase the excavation of foundation pit degree of depth, reduces soldier pile stake top displacement, increases the campshed anti-overturning, reduce the campshed design strength, can reduce construction costs further.
Description of drawings
Fig. 1 is the schematic diagram of cantilever supporting of the present invention;
Fig. 2 is the schematic diagram that the present invention draws the supporting of anchor formula;
Fig. 3 is the schematic diagram of inner bearing type supporting of the present invention.
Among the figure: 1, campshed, 2, Guan Liang, 3, the end, foundation ditch hole, 4, anchor pole, 5, inner support.
The specific embodiment
For further understanding summary of the invention of the present invention, characteristics and effect, exemplify following examples now, and conjunction with figs. is described in detail as follows:
See also Fig. 1～Fig. 3, the present invention utilizes the inclination campshed to carry out pattern foundation pit supporting structure and may further comprise the steps:
(a) according to site condition and safety and stability computational analysis, determine the angle that optimum single campshed 1 tilts to the foundation ditch outside, the angle of inclination of campshed can for: 1～15 °; Design with pile strength stake is long, it is identical with common vertical campshed to utilize the inclination campshed to carry out the structure types of pattern foundation pit supporting structure, according to different site conditions and engineering situation, can adopt cantilever pile supporting, inner bearing type supporting respectively or draw the supporting of anchor formula.If the cantilever pile supporting does not meet design requirement, can adopt the inner bearing type supporting or draw the supporting of anchor formula according to actual conditions, and support or anchor pole are designed, determine the excavation progression of foundation ditch;
(b) construction campshed 1.Because campshed is the tilting supporting, when soil condition is relatively good, can adopt bored pile; Poor when soil condition, when collapsing the hole phenomenon easily, can adopt preformed pile or telescoping screw rig drill-pouring pile.The construction of inclination campshed can be adopted several different methods, as hangs up and beats preformed pile, bored pile, telescoping screw brill drill-pouring pile and hand excavated pile etc.Wherein telescoping screw bores drill-pouring bore forming worker method, has advantages such as penetration rate is fast, pile quality is high, the sleeve pipe retaining wall is difficult for collapsing the hole, the pile body inclining degree can accurately be controlled and is used widely.
(c) construction foundation pit supporting and protection structure.Supporting and protection structure for single stake according to situations such as the residing soil layer characteristics of foundation ditch, surrounding enviroment, can be divided into following three kinds of forms:
1. cantilever pile supporting.See also Fig. 1, more shallow when excavation of foundation pit, geological conditions is better, when Deformation control is less demanding, can adopt be provided with on the campshed 1 hat beam 2 the cantilever pile support form.After the cantilever pile pile strength reaches the regulation requirement, just can carry out the excavation of soil layer.
2. inner bearing type supporting.See also Fig. 3, when the excavation of foundation pit area is big, ground is weak, Deformation control requires can adopt campshed 1 inboard that the inner bearing type supporting of inner support 5 is set when high.At first pit earthwork is excavated to the bed course bottom surface at the bottom of the first road reinforced concrete brace, chisel supporting and protection structure and the joint face that encloses purlin then, and carry out steel concrete and support cushion construction, colligation bearing bar subsequently, prop up upright side template, finish after-pouring concrete and maintenance, when concrete strength reaches regulation, carry out form removal and cleaning work.
3. draw the supporting of anchor formula.See also Fig. 2, better when foundation ditch soil layer condition, reach and draw the anchor condition, and surrounding enviroment are when less demanding, that can adopt campshed 1 arranged outside anchor pole 4 draws the supporting of anchor formula.When foundation ditch at first soil layer be excavated to the following certain depth of anchor pole center line place, first road, utilize machine drilling, make anchor pole according to the rules and insert and send rod member, carry out slip casting subsequently and form anchoring section, after anchoring body reaches certain intensity, it is carried out stretch-draw and locking at last.
(d) excavation pit.For the foundation ditch of classification excavation, at different campshed support forms, repeating step (c) construction is until being excavated to the foundation ditch bottom.
(e) end 3, foundation ditch hole, cleared up, flattens, and carry out next step construction working.
The present invention adopts the campshed with constant slope that foundation ditch is carried out supporting, increases base pit stability and anti-overturning; The soil body that the campshed outside has gradient reduces the campshed soil pressure, reduces campshed tip displacement and pile body moment of flexure, thereby improves the campshed support rigidity relatively and increase the excavation of foundation pit degree of depth.
The long 65.0m of certain dormitory building base pit engineering, wide 15.0m, foundation ditch dig dark 5.120m, and the geotechnical investigation report shows that ground is miscellaneous fill to buried depth 2m scope, and buried depth 2m is a silt to buried depth 12m scope.The no important building of this Foundation Pit Construction place periphery, supporting and protection structure adopts the supporting of inclination campshed cantilever, and gradient is 10 °, the long 11m of soldier pile, stake footpath 800mm, pilespacing 100mm adopts the construction of prefabricated piles worker method of hanging up and beating.Adopt drainage well precipitation in the hole, cut and cover tunneling, place, four right angles of foundation ditch adopts 45 ° of slope angles to put the slope and handles.
The long 190.0m of certain subway station pit engineering, wide 20.7m, foundation ditch dig dark 14.070m.The long side direction both sides adopt the inclination campshed to add the bolt support structure, and two ends adopt diaphragm wall to shift to an earlier date shutoff.
Stratum in excavation of foundation pit depth bounds vertical distribution from top to bottom is: banket thickness 2.70～4.50m; 2. mud, thickness 8.10～13.00m; 3. cobble sand, thickness 1.0～8.0m; 4. silty clay, thickness 0.18～2.80m; 5. remain the chiltern cohesive soil, thickness 1.40～13.10m; 6. completely decomposed granite, thickness 0.85～7.85m; 7.-1 sand shape strong weathered granite, thickness 0.40～14.50m; 7.-2 chunky shape strong weathered granite, thickness 1.0～3.9m; 8. middle decomposed granite, thickness 1.10～12.20m; 9. gentle breeze granite.
Supporting and protection structure adopts the inclination campshed to add bolt support, and the campshed gradient is 10 °, the long 29m of soldier pile, and stake footpath 800mm, pilespacing 100mm adopts telescoping screw rig drill-pouring pile.
Anchor rod anchored segment length 19m, anchor pole are positioned at stake top totally three rows of 3.20m, 7.35m and 9.95m place down, anchor hole diameter 150mm, and anchor pole inclination alpha=15 °, anchor pole spacing 1.5m selects III level (HRB400) reinforcing bar of 2 28mm for use.
Certain circular foundation ditch, 126 meters of diameters are cheated dark 12.650 meters, adopt inclination campshed and back-pressure soil to carry out pattern foundation pit supporting structure.Foundation ditch field ground absolute altitude is 2.143 meters of height above sea level, and ground is miscellaneous fill and silt to absolute altitude-18 meter scope, and absolute altitude-18 meter to absolute altitude-27 meter is a silty clay, and soil condition is better.Arrange in the foundation ditch that pipe well carries out drainage precipitation.
Foundation pit supporting construction adopts the supporting of inclination campshed cantilever, and the campshed angle of inclination is 1 °, the long 26m of soldier pile, and stake footpath 800mm, the stake bottom center adopts telescoping screw rig drill-pouring pile apart from being 850mm.
Back-pressure soil is reserved at the end, hole, and back-pressure soil is high 3.5 meters, and bottom, the hole annular bandwidth of branch back-pressure soil is 6 meters, 2.5 meters of back-pressure soil top annular bandwidth, and the back-pressure soil slight slope gradient is 45 °, back-pressure soil surface spray plain concrete mask.
Basic principle of the present invention is: grade of side slope is little more stable when bigger than the gradient, more difficult topple to destroy with monolithic stability destroy.In like manner, exist the side slope of certain slope more stable than vertical side slope, therefore lower to the requirement of supporting and protection structure.Method of the present invention just is being based on this thought, under the situation of place permission, adopts the campshed with constant slope that foundation ditch is carried out supporting.When carrying out pattern foundation pit supporting structure with taper pile, it is little to have the sphenoid of the tendency toward sliding sphenoid when more vertical than stake after the stake, and reason is that a stake back sphenoid is because the gradient has been lacked a part.Therefore, the soil body can significantly reduce the active force of stake, and stake top displacement and pile body are stressed so all can reduce a lot.In theory, the gradient of stake is big more, stressed and the stake top displacement of stake is more little, thereby economical more, but the gradient of stake can not unconfinedly increase, because because the restriction of construction plant, may there be enough spaces to make the gradient of stake too big, on the other hand, when the gradient of stake is big, stake below its foundation depth may influence the construction of pile foundation owing to reach below the foundation ditch inner space.Zhuan inclination can make the long increase of stake in addition, offsets a part and reduces the economy of bringing because of pile strength, and the soldier pile difficulty of construction is increased.Therefore the taper pile supporting is in actual application, the factor of determining to take into full account each side of its gradient.
Although in conjunction with the accompanying drawings the preferred embodiments of the present invention are described above; but the present invention is not limited to the above-mentioned specific embodiment; the above-mentioned specific embodiment only is schematic; be not restrictive; those of ordinary skill in the art is under enlightenment of the present invention; not breaking away under the scope situation that aim of the present invention and claim protect, can also make a lot of forms, these all belong within protection scope of the present invention.
Claims (4)
1. a method for supporting and protecting row pile pit is characterized in that, described campshed is the single campshed that tilts to the foundation ditch outside, and this method may further comprise the steps:
(a) according to site condition and computational analysis, determine the campshed angle of inclination, determine stake long with pile strength, determine foundation pit supporting construction, determine the excavation progression of foundation ditch;
(b) construction campshed;
(c) construction foundation pit supporting and protection structure;
(d) excavation pit;
(e) end, foundation ditch hole, cleared up, flattens, and carry out next step construction working.
2. method for supporting and protecting row pile pit according to claim 1 is characterized in that: the angle of inclination of described campshed is: 1～15 °.
3. method for supporting and protecting row pile pit according to claim 2 is characterized in that: described campshed is bored pile or preformed pile or cased bore-bole castinplace pile.
4. method for supporting and protecting row pile pit according to claim 2 is characterized in that: described foundation pit supporting construction is supporting of cantilever pile formula or the supporting of inner bearing type formula or draws the supporting of anchor formula.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008101529252A CN101408023A (en) | 2008-11-11 | 2008-11-11 | Method for supporting and protecting row pile pit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008101529252A CN101408023A (en) | 2008-11-11 | 2008-11-11 | Method for supporting and protecting row pile pit |
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| CN101408023A true CN101408023A (en) | 2009-04-15 |
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| CNA2008101529252A Pending CN101408023A (en) | 2008-11-11 | 2008-11-11 | Method for supporting and protecting row pile pit |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102864781A (en) * | 2012-09-29 | 2013-01-09 | 成都四海岩土工程有限公司 | Foundation pit supporting method utilizing inclined piles |
| CN103114595A (en) * | 2013-01-06 | 2013-05-22 | 厦门源昌城建集团有限公司 | Support method and device of support pile preformed core-soil double-buttress inclined inner-strut foundation ditch |
| CN103132532A (en) * | 2013-02-28 | 2013-06-05 | 四川省长源建筑工程有限责任公司 | Foundation pit support method for row of piles |
| CN103132530A (en) * | 2011-11-29 | 2013-06-05 | 上海市基础工程有限公司 | Guard relay pile construction method under land and rock combination geological conditions |
| CN103485347A (en) * | 2012-06-07 | 2014-01-01 | 叶强 | Batter pile used for building foundation pit support and construction method thereof |
| CN103510524A (en) * | 2012-06-26 | 2014-01-15 | 邹宗煊 | Inclined circular annular pile and construction method thereof |
| CN103669365A (en) * | 2012-08-29 | 2014-03-26 | 张绍球 | External diagonal-pulling and internal diagonal-bracing herringbone foundation pit supporting pile and construction method thereof |
| CN106638609A (en) * | 2016-11-21 | 2017-05-10 | 上海建工二建集团有限公司 | Upright post pile |
| CN107620309A (en) * | 2017-07-27 | 2018-01-23 | 天津大学 | Foundation pit supporting method |
| CN108978687A (en) * | 2018-09-03 | 2018-12-11 | 南华大学 | It is a kind of landslide and slope treatment non-straight vertical anti-slide pile structure and installation method |
| CN110468850A (en) * | 2019-08-29 | 2019-11-19 | 天津大学 | A kind of oblique cement mixing method foundation pit supporting system and method for protecting support |
| CN111720142A (en) * | 2020-05-28 | 2020-09-29 | 三明学院 | Man-excavated pile advanced support method suitable for karst stratum |
| CN112832296A (en) * | 2020-12-31 | 2021-05-25 | 广东大禹水利建设有限公司 | Strong-permeable stratum anti-seepage method for pump station construction |
| CN114561961A (en) * | 2022-04-19 | 2022-05-31 | 中国建筑一局(集团)有限公司 | Foundation pit pile-anchor supporting system for reducing anchor cable penetration depth and construction method thereof |
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2008
- 2008-11-11 CN CNA2008101529252A patent/CN101408023A/en active Pending
Cited By (15)
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|---|---|---|---|---|
| CN103132530B (en) * | 2011-11-29 | 2015-10-14 | 上海市基础工程集团有限公司 | Tu Yan is in conjunction with the construction method of guard relay pile under geological conditions |
| CN103132530A (en) * | 2011-11-29 | 2013-06-05 | 上海市基础工程有限公司 | Guard relay pile construction method under land and rock combination geological conditions |
| CN103485347A (en) * | 2012-06-07 | 2014-01-01 | 叶强 | Batter pile used for building foundation pit support and construction method thereof |
| CN103510524A (en) * | 2012-06-26 | 2014-01-15 | 邹宗煊 | Inclined circular annular pile and construction method thereof |
| CN103669365A (en) * | 2012-08-29 | 2014-03-26 | 张绍球 | External diagonal-pulling and internal diagonal-bracing herringbone foundation pit supporting pile and construction method thereof |
| CN102864781A (en) * | 2012-09-29 | 2013-01-09 | 成都四海岩土工程有限公司 | Foundation pit supporting method utilizing inclined piles |
| CN103114595A (en) * | 2013-01-06 | 2013-05-22 | 厦门源昌城建集团有限公司 | Support method and device of support pile preformed core-soil double-buttress inclined inner-strut foundation ditch |
| CN103132532A (en) * | 2013-02-28 | 2013-06-05 | 四川省长源建筑工程有限责任公司 | Foundation pit support method for row of piles |
| CN106638609A (en) * | 2016-11-21 | 2017-05-10 | 上海建工二建集团有限公司 | Upright post pile |
| CN107620309A (en) * | 2017-07-27 | 2018-01-23 | 天津大学 | Foundation pit supporting method |
| CN108978687A (en) * | 2018-09-03 | 2018-12-11 | 南华大学 | It is a kind of landslide and slope treatment non-straight vertical anti-slide pile structure and installation method |
| CN110468850A (en) * | 2019-08-29 | 2019-11-19 | 天津大学 | A kind of oblique cement mixing method foundation pit supporting system and method for protecting support |
| CN111720142A (en) * | 2020-05-28 | 2020-09-29 | 三明学院 | Man-excavated pile advanced support method suitable for karst stratum |
| CN112832296A (en) * | 2020-12-31 | 2021-05-25 | 广东大禹水利建设有限公司 | Strong-permeable stratum anti-seepage method for pump station construction |
| CN114561961A (en) * | 2022-04-19 | 2022-05-31 | 中国建筑一局(集团)有限公司 | Foundation pit pile-anchor supporting system for reducing anchor cable penetration depth and construction method thereof |
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Open date: 20090415 |