CN105089061A - Ultra-deep foundation pit supporting method - Google Patents

Ultra-deep foundation pit supporting method Download PDF

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Publication number
CN105089061A
CN105089061A CN201510487933.2A CN201510487933A CN105089061A CN 105089061 A CN105089061 A CN 105089061A CN 201510487933 A CN201510487933 A CN 201510487933A CN 105089061 A CN105089061 A CN 105089061A
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China
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foundation ditch
bar concrete
steel bar
bored pile
purlin
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CN201510487933.2A
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Chinese (zh)
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CN105089061B (en
Inventor
陈钧颐
肖亚荣
周健
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泰兴市第一建筑安装工程有限公司
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Priority to CN201510487933.2A priority Critical patent/CN105089061B/en
Publication of CN105089061A publication Critical patent/CN105089061A/en
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Abstract

The invention relates to an ultra-deep foundation pit supporting method which comprises a single-row triaxial deep-mixing pile water-stop curtain, bored piles and upright steel posts, wherein the single-row triaxial deep-mixing pile water-stop curtain is lower than natural ground and is arranged along the periphery of a foundation pit in an enclosing way; the bored piles are sequentially arranged at intervals in the foundation pit and located on the inner side of the single-row triaxial deep-mixing pile water-stop curtain; the upright steel posts are arranged in the foundation pit and located on the inner sides of the bored piles; the tops of the bored piles are sequentially connected via reinforced concrete crown beams in a pulling way; reinforced concrete enclosing purlins along the periphery of the foundation pit are arranged in positions, which are not the height positions of floor slabs of underground floors, on the inner sides of the bored piles; the inner sides of the reinforced concrete enclosing purlins are connected in a pulling way via reinforced concrete enclosing purlin beams supported on the upright steel posts; the reinforced concrete enclosing purlin beams are in latticed pulling connection with the reinforced concrete enclosing purlins via a plurality of groups of inner reinforced concrete supports; filling plain concrete is arranged inwards at the bottoms of the bored piles; a baseplate is laid on the foundation pit and enclosed by the filling plain concrete; and more than one post-cast strip with support replacement pieces is arranged on the baseplate.

Description

A kind of ultra-deep foundation pit supporting method
Technical field
This inventionrelating to a kind of foundation pit supporting method, is a kind of ultra-deep foundation pit supporting method specifically.
Background technology
Foundation ditch belongs to temporary work, and its effect is to provide a space, makes the operation of building by laying bricks or stones on basis be able to carry out according to the position specified by design.For ensureing the safety of Underground Construction and foundation ditch surrounding enviroment, usually need a pattern foundation pit supporting structure measure gear being adopted usually to foundation pit side-wall and surrounding enviroment, reinforces.
Along with the development of economic construction, the engineering of the large scale of construction such as super highrise building and City complex building also occurs more and more, these large scale of construction engineerings not only area of overground part and highly larger, the area of under ground portion and the degree of depth are general also all larger, and these large scale of construction engineering in generals all can be located in the bustling location in city, Floorplanning land used is at full stretch, surrounding enviroment also can more complicated, very large impact can be caused thus to the construction of underground construction, its foundation depth far surpasses 10 meters, belong to ultra-deep foundation pit, foundation ditch is comparatively complicated, its excavation and supporting directly have influence on engineering construction.Traditional deep foundation pit support is mostly the foundation ditch of 5 meters, and supporting deep pit digging and support technology cannot meet the demand of deep foundation ditch.
Summary of the invention
The problem of ultra-deep foundation pit demand cannot be met for deep foundation pit support of the prior art, this inventionprovide a kind of structure simple, firm, construct convenient, supporting performance is high, is convenient to the ultra-deep foundation pit supporting method of deep pit monitor excavation.
This inventionthe technical scheme adopted is: a kind of ultra-deep foundation pit support system, comprise single tri-axes deep mixing pile water stopping curtain, bored pile and steel post, single tri-axes deep mixing pile water stopping curtain goes along with sb. to guard him setting lower than natural ground along foundation ditch surrounding, multiple bored pile is arranged at intervals in the foundation ditch inside single tri-axes deep mixing pile water stopping curtain successively, multiple steel post is arranged in the foundation ditch inside bored pile, multiple bored pile top sockets through steel bar concrete Guan Liang successively, inside each underground storey floors height and position non-of multiple bored pile, the steel bar concrete arranged along foundation ditch surrounding encloses purlin, steel bar concrete encloses in purlin to enclose and is supported in steel bar concrete on steel post and encloses purlin beam through multiple and socket, it is latticed socketing that steel bar concrete encloses that purlin beam and steel bar concrete to enclose between purlin through organizing steel bar concrete inner support more, the bottom of multiple bored pile is inwardly arranged tamps plain concrete, tamp on the foundation ditch that encloses in plain concrete and lay base plate, base plate is arranged the ater-casting of band support replacement above together.
Further, between base plate and foundation ditch, bed course is set.
Further, single tri-axes deep mixing pile water stopping curtain top is stretched in single tri-axes deep mixing pile water stopping curtain through steel pipe socket coping.
Further, the stake in bored pile is long for being arranged alternately along foundation ditch inward-outward direction one length two is short.
Further, uniform inside each underground storey floors height and position of multiple bored pile multiple support replacement block be inlaid on bored pile is set, support replacement block level each underground storey floors thickness corresponding and underground outer wall of floor in vertical support foundation ditch.
Further, support replacement block setting-in bored pile at least completely.
Further, steel post is angle steel lattice column, and steel post bottom is concrete column stake.
Further, the natural ground outside foundation ditch single tri-axes deep mixing pile water stopping curtain is arranged the catchwater along foundation ditch surrounding, the multiple dewatering wells arranged inside foundation ditch bored pile.
Again further, outside single tri-axes deep mixing pile water stopping curtain, be provided with three axles element stakes of the cold seam of corresponding construction, three axles element stakes with overlap with cold seam of constructing centrosymmetric tri-axes deep mixing stake, overlap thickness and be not less than 1/5 of tri-axes deep mixing stake diameter.
Ultra-deep foundation pit supporting method step:
(1) by design of foundation pit all around unwrapping wire, a complete set of complex mixing type of job-hopping formula diplopore is constructed single tri-axes deep mixing pile water stopping curtain;
(2) enclose in single tri-axes deep mixing pile water stopping curtain interval construction multiple along foundation ditch all around uniform intervals arrangement bored pile, bored pile design strength is underwater concrete C35, and the stake in bored pile is long for being arranged alternately along foundation ditch inward-outward direction one length two is short;
(3) bore multiple leghole in foundation ditch, establish steel post in leghole, concreting stand column pile under steel post foundation ditch;
(4) the first floor earthwork in excavation pit, encloses the multiple dewatering well of construction, the pre-precipitation of dewatering well in bored pile; Bored pile top construction reinforced bar concrete Guan Liang sockets; On foundation ditch face after first floor soil excavation, construction reinforced bar concrete encloses purlin, steel bar concrete encloses purlin and connects bored pile, steel bar concrete encloses the steel bar concrete of Construction Support on steel post in purlin and encloses purlin beam, steel bar concrete encloses purlin and steel bar concrete and encloses latticed steel bar concrete inner support of constructing between purlin beam and socket and be integrated, and supports maintenance;
(5) second layer earthwork in excavation pit, on foundation ditch face after second layer soil excavation, construction reinforced bar concrete encloses purlin, steel bar concrete encloses purlin and connects bored pile, steel bar concrete encloses the steel bar concrete of Construction Support on steel post in purlin and encloses purlin beam, steel bar concrete encloses purlin and steel bar concrete and encloses latticed steel bar concrete inner support of constructing between purlin beam and socket and be integrated, and supports maintenance; Dewatering well precipitation maintains simultaneously;
(6) subsequent multi-layer soil excavation is completed by step (5), and construction supporting structure on foundation ditch face after every layer of soil excavation, until the foundation ditch bottom, foundation ditch bottom construction cushion coat and corner element concrete tamp, base plate that bed course is constructed, waterproof slab;
(7) construction foundation pit outer wall of basement; Remove construction supporting structure on the foundation ditch face after every layer of soil excavation from the bottom to top, the each storey floors in room under construction ground, interval in dismounting, and support replacement block of constructing between the exterior wall and bored pile of storey floors height and position, support replacement block is inlaid on bored pile;
(8) external wall waterproof, backfill; Foundation ditch basement structure binds.
After adopting technique scheme, the invention has the beneficial effects as follows: a complete set of complex mixing type construction of tri-axes deep mixing stake job-hopping formula diplopore, can construction quality be guaranteed, ensure the continuity of water-stop curtain and the construction quality of joint area, coordinate peripheral catchwater to play sealing effect; When during construction, cold seam appears in water-stop curtain, corresponding tri-axes deep mixing stake periphery takes to stir in cold seam outside benefit, overlap plain stake, guarantees structural strength and the safety of tri-axes deep mixing stake; The long setting of stake that bored pile adopts a length two short, effectively takes into account construction investment cost and supporting capacity, improves usage safety performance; Adopt the set of catchwater publicly price-reduction water and dewatering well deep-well precipitation, guarantee the construction safety of the soil body; Foundation ditch is from top to bottom constructed by the excavation number of plies, first cut the earth, then construction reinforced bar concrete encloses purlin, steel bar concrete encloses purlin beam and latticed steel bar concrete inner support, the support of match-drill castinplace pile and steel post, successively excavation and design of its support, improves the safety of excavation pit; Supporting construction is to the foundation ditch bottom, and plain concrete tamps base plate and bored pile corner corner, and raising base plate and bored pile syndeton are stablized further; Construction foundation pit outer wall of basement makes, and adopts and changes block supports every layer storey floors and bored pile, guarantees vertical, the stable construction of exterior wall.
Accompanying drawing explanation
Fig. 1 is this inventionthe top view of system;
Fig. 2 is this inventionthe sectional view of system.
In figure: foundation ditch 1, catchwater 2, tri-axes deep mixing pile water stopping curtain 3, bored pile 4, steel post 5, steel bar concrete hat beam 6, steel bar concrete encloses purlin 7, and steel bar concrete encloses purlin beam 8, steel bar concrete inner support 9, base plate 10, bed course 11, plain concrete tamps 12, dewatering well 13, exterior wall 14, support replacement block 15, coping 16, underground storey floors 17.
Detailed description of the invention
Below in conjunction with drawings and Examples, the invention will be further described.
Fig. 1, shown in 2: a kind of ultra-deep foundation pit support system comprises single tri-axes deep mixing pile water stopping curtain 3, bored pile 4 and steel post 5, single tri-axes deep mixing pile water stopping curtain 3 goes along with sb. to guard him setting lower than natural ground along foundation ditch 1 surrounding, single tri-axes deep mixing pile water stopping curtain 3 top is stretched in single tri-axes deep mixing pile water stopping curtain through steel pipe and sockets coping 16, multiple bored pile 4 is arranged at intervals in the foundation ditch 1 inside single tri-axes deep mixing pile water stopping curtain 3 successively, stake in bored pile 4 is long for being arranged alternately along foundation ditch inward-outward direction one length two is short, multiple steel post 5 is arranged in the foundation ditch 1 inside bored pile 4, steel post is angle steel lattice column, steel post bottom is concrete column stake, natural ground outside single tri-axes deep mixing pile water stopping curtain 3 is arranged along the catchwater 2 of foundation ditch 1 surrounding and the multiple dewatering wells 13 along the setting of foundation ditch 1 surrounding uniform intervals.Multiple bored pile 4 top sockets through steel bar concrete hat beam 6 successively, inside each underground storey floors height and position non-of multiple bored pile 4, the steel bar concrete arranged along foundation ditch 1 surrounding encloses purlin 7, steel bar concrete encloses in purlin 7 to enclose and is supported in steel bar concrete on steel post 5 and encloses purlin beam 8 through multiple and socket, it is latticed socketing that steel bar concrete encloses that purlin beam 8 and steel bar concrete to enclose between purlin 7 through how organize steel bar concrete inner support 9, the bottom of multiple bored pile 4 is inwardly arranged tamps plain concrete 12, tamp on the foundation ditch that encloses in plain concrete 12 and lay bed course 11 and base plate 10, base plate is arranged the ater-casting of band support replacement above together.
Uniform inside each underground storey floors 17 height and position of multiple bored pile 4 multiple support replacement block 15 be inlaid on bored pile 4 is set, support replacement block level each underground storey floors thickness corresponding and underground outer wall of floor in vertical support foundation ditch, support replacement block is setting-in bored pile at least completely.
Ultra-deep foundation pit supporting method step of the present invention:
(1) by design of foundation pit all around unwrapping wire, a complete set of complex mixing type of job-hopping formula diplopore is constructed single tri-axes deep mixing pile water stopping curtain, catchwater 2 of constructing in the natural ground outside single tri-axes deep mixing pile water stopping curtain;
(2) enclose in single tri-axes deep mixing pile water stopping curtain interval construction multiple along foundation ditch all around uniform intervals arrangement bored pile, bored pile design strength is underwater concrete C35, and the stake in bored pile is long for being arranged alternately along foundation ditch inward-outward direction one length two is short;
(3) bore multiple leghole in foundation ditch, establish steel post in leghole, concreting stand column pile under steel post foundation ditch;
(4) the first floor earthwork in excavation pit, encloses the multiple dewatering well 13 of construction, the pre-precipitation of dewatering well in bored pile; Bored pile top construction reinforced bar concrete Guan Liang sockets; On foundation ditch face after first floor soil excavation, construction reinforced bar concrete encloses purlin, steel bar concrete encloses purlin and connects bored pile, steel bar concrete encloses the steel bar concrete of Construction Support on steel post in purlin and encloses purlin beam, steel bar concrete encloses purlin and steel bar concrete and encloses latticed steel bar concrete inner support of constructing between purlin beam and socket and be integrated, and supports maintenance;
(5) second layer earthwork in excavation pit, on foundation ditch face after second layer soil excavation, construction reinforced bar concrete encloses purlin, steel bar concrete encloses purlin and connects bored pile, steel bar concrete encloses the steel bar concrete of Construction Support on steel post in purlin and encloses purlin beam, steel bar concrete encloses purlin and steel bar concrete and encloses latticed steel bar concrete inner support of constructing between purlin beam and socket and be integrated, and supports maintenance; Dewatering well precipitation maintains simultaneously;
(6) subsequent multi-layer soil excavation is completed by step (5), and construction supporting structure on foundation ditch face after every layer of soil excavation, until the foundation ditch bottom, foundation ditch bottom construction cushion coat and corner element concrete tamp, base plate that bed course is constructed, waterproof slab;
(7) construction foundation pit outer wall of basement; Remove construction supporting structure on the foundation ditch face after every layer of soil excavation from the bottom to top, the each storey floors in room under construction ground, interval in dismounting, and support replacement block of constructing between the exterior wall and bored pile of storey floors height and position, support replacement block is inlaid on bored pile;
External wall waterproof, backfill; Foundation ditch basement structure binds.

Claims (1)

1. a ultra-deep foundation pit supporting method, comprise single tri-axes deep mixing pile water stopping curtain, bored pile and steel post, single tri-axes deep mixing pile water stopping curtain goes along with sb. to guard him setting lower than natural ground along foundation ditch surrounding, multiple bored pile is arranged at intervals in the foundation ditch inside single tri-axes deep mixing pile water stopping curtain successively, multiple steel post is arranged in the foundation ditch inside bored pile, multiple bored pile top sockets through steel bar concrete Guan Liang successively, inside each underground storey floors height and position non-of multiple bored pile, the steel bar concrete arranged along foundation ditch surrounding encloses purlin, steel bar concrete encloses in purlin to enclose and is supported in steel bar concrete on steel post and encloses purlin beam through multiple and socket, it is latticed socketing that steel bar concrete encloses that purlin beam and steel bar concrete to enclose between purlin through organizing steel bar concrete inner support more, the bottom of multiple bored pile is inwardly arranged tamps plain concrete, tamp on the foundation ditch that encloses in plain concrete and lay base plate, base plate is arranged the ater-casting of band support replacement above together, between base plate and foundation ditch, bed course is set, single tri-axes deep mixing pile water stopping curtain top is stretched in single tri-axes deep mixing pile water stopping curtain through steel pipe and sockets coping, stake in bored pile is long for being arranged alternately along foundation ditch inward-outward direction one length two is short, uniform inside each underground storey floors height and position of multiple bored pile multiple support replacement block be inlaid on bored pile is set, support replacement block level each underground storey floors thickness corresponding and underground outer wall of floor in vertical support foundation ditch, support replacement block is setting-in bored pile at least completely, steel post is angle steel lattice column, and steel post bottom is concrete column stake, natural ground outside foundation ditch single tri-axes deep mixing pile water stopping curtain is arranged the catchwater along foundation ditch surrounding, the multiple dewatering wells arranged inside foundation ditch bored pile, be provided with three axles element stakes of the cold seam of corresponding construction outside single tri-axes deep mixing pile water stopping curtain, three axles element stakes with overlap with cold seam of constructing centrosymmetric tri-axes deep mixing stake, overlap thickness and be not less than 1/5 of tri-axes deep mixing stake diameter, supporting method, comprises the following steps:
By design of foundation pit all around unwrapping wire, a complete set of complex mixing type of job-hopping formula diplopore is constructed single tri-axes deep mixing pile water stopping curtain;
Enclose construction multiple bored pile along foundation ditch all around uniform intervals arrangement in interval in single tri-axes deep mixing pile water stopping curtain, bored pile design strength is underwater concrete C35, and the stake in bored pile is long for being shortly arranged alternately along foundation ditch inward-outward direction one long two;
Bore multiple leghole in foundation ditch, establish steel post in leghole, concreting stand column pile under steel post foundation ditch;
The first floor earthwork in excavation pit, encloses the multiple dewatering well of construction, the pre-precipitation of dewatering well in bored pile; Bored pile top construction reinforced bar concrete Guan Liang sockets; On foundation ditch face after first floor soil excavation, construction reinforced bar concrete encloses purlin, steel bar concrete encloses purlin and connects bored pile, steel bar concrete encloses the steel bar concrete of Construction Support on steel post in purlin and encloses purlin beam, steel bar concrete encloses purlin and steel bar concrete and encloses latticed steel bar concrete inner support of constructing between purlin beam and socket and be integrated, and supports maintenance;
The second layer earthwork in excavation pit, on foundation ditch face after second layer soil excavation, construction reinforced bar concrete encloses purlin, steel bar concrete encloses purlin and connects bored pile, steel bar concrete encloses the steel bar concrete of Construction Support on steel post in purlin and encloses purlin beam, steel bar concrete encloses purlin and steel bar concrete and encloses latticed steel bar concrete inner support of constructing between purlin beam and socket and be integrated, and supports maintenance; Dewatering well precipitation maintains simultaneously;
Subsequent multi-layer soil excavation is completed by step (5), and construction supporting structure on foundation ditch face after every layer of soil excavation, until the foundation ditch bottom, foundation ditch bottom construction cushion coat and corner element concrete tamp, base plate that bed course is constructed, waterproof slab;
Construction foundation pit outer wall of basement; Remove construction supporting structure on the foundation ditch face after every layer of soil excavation from the bottom to top, the each storey floors in room under construction ground, interval in dismounting, and support replacement block of constructing between the exterior wall and bored pile of storey floors height and position, support replacement block is inlaid on bored pile;
External wall waterproof, backfill; Foundation ditch basement structure binds.
CN201510487933.2A 2015-08-11 2015-08-11 Ultra-deep foundation pit supporting method CN105089061B (en)

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106351343A (en) * 2016-11-10 2017-01-25 成都市第八建筑工程公司 Basement outer wall waterproof protection structure capable of realizing synchronous crossing construction and construction method thereof
CN106400985A (en) * 2016-11-10 2017-02-15 成都市第八建筑工程公司 Basement outer wall waterproof protection structure and construction method
CN107313454A (en) * 2017-08-31 2017-11-03 南京叭叭智能科技有限公司 A kind of construction method of underground garage
CN107700497A (en) * 2017-09-29 2018-02-16 广州市番禺区第五建筑工程公司 A kind of building basement pattern foundation pit supporting structure and earth excavation construction method
CN107938706A (en) * 2017-11-14 2018-04-20 宁波市交通规划设计研究院有限公司 Shallow tunnel foundation pit enclosure section arched roof formula combines open-cut tunnel structure and construction method
CN108442406A (en) * 2018-03-29 2018-08-24 中冶成都勘察研究总院有限公司 A kind of semi-inverse method internal support of foundation pit structure and its construction method
CN109371982A (en) * 2018-12-07 2019-02-22 武汉丰达地质工程有限公司 A kind of construction method of basement bottom board support replacement
CN109577337A (en) * 2017-09-29 2019-04-05 中国石油天然气股份有限公司 The construction method of deep foundation ditch of flowing line
CN109706939A (en) * 2019-01-14 2019-05-03 杭州江润科技有限公司 Deep basal pit prestressing combination bracing members and construction method

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JP5180022B2 (en) * 2008-10-03 2013-04-10 株式会社竹中土木 Constraining method for mountain retaining wall head
CN203403422U (en) * 2013-06-06 2014-01-22 广西建工集团第五建筑工程有限责任公司 Long-span reinforced concrete inner support structure of rectangular deep foundation pit
CN204343301U (en) * 2014-12-13 2015-05-20 中铁二十局集团第三工程有限公司 A kind of Metro station excavation excavation supporting structure
CN104775440A (en) * 2015-04-21 2015-07-15 五洋建设集团股份有限公司 Mineshaft-type underground garage deep foundation pit supporting structure

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Publication number Priority date Publication date Assignee Title
JP5180022B2 (en) * 2008-10-03 2013-04-10 株式会社竹中土木 Constraining method for mountain retaining wall head
CN203403422U (en) * 2013-06-06 2014-01-22 广西建工集团第五建筑工程有限责任公司 Long-span reinforced concrete inner support structure of rectangular deep foundation pit
CN204343301U (en) * 2014-12-13 2015-05-20 中铁二十局集团第三工程有限公司 A kind of Metro station excavation excavation supporting structure
CN104775440A (en) * 2015-04-21 2015-07-15 五洋建设集团股份有限公司 Mineshaft-type underground garage deep foundation pit supporting structure

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106351343A (en) * 2016-11-10 2017-01-25 成都市第八建筑工程公司 Basement outer wall waterproof protection structure capable of realizing synchronous crossing construction and construction method thereof
CN106400985A (en) * 2016-11-10 2017-02-15 成都市第八建筑工程公司 Basement outer wall waterproof protection structure and construction method
CN106400985B (en) * 2016-11-10 2020-01-31 成都市第八建筑工程公司 basement exterior wall waterproof protection structure and construction method
CN107313454A (en) * 2017-08-31 2017-11-03 南京叭叭智能科技有限公司 A kind of construction method of underground garage
CN107700497A (en) * 2017-09-29 2018-02-16 广州市番禺区第五建筑工程公司 A kind of building basement pattern foundation pit supporting structure and earth excavation construction method
CN109577337A (en) * 2017-09-29 2019-04-05 中国石油天然气股份有限公司 The construction method of deep foundation ditch of flowing line
CN107938706B (en) * 2017-11-14 2019-10-18 宁波市交通规划设计研究院有限公司 Shallow tunnel foundation pit enclosure section arched roof formula combines open-cut tunnel structure and construction method
CN107938706A (en) * 2017-11-14 2018-04-20 宁波市交通规划设计研究院有限公司 Shallow tunnel foundation pit enclosure section arched roof formula combines open-cut tunnel structure and construction method
CN108442406A (en) * 2018-03-29 2018-08-24 中冶成都勘察研究总院有限公司 A kind of semi-inverse method internal support of foundation pit structure and its construction method
CN109371982A (en) * 2018-12-07 2019-02-22 武汉丰达地质工程有限公司 A kind of construction method of basement bottom board support replacement
CN109706939A (en) * 2019-01-14 2019-05-03 杭州江润科技有限公司 Deep basal pit prestressing combination bracing members and construction method
CN109706939B (en) * 2019-01-14 2020-09-15 杭州江润科技有限公司 Deep foundation pit prestress combined steel support and construction method

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