CN204510230U - Rich groundwater and the bad deep pit digging supporting and protection structure of geology - Google Patents

Rich groundwater and the bad deep pit digging supporting and protection structure of geology Download PDF

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Publication number
CN204510230U
CN204510230U CN201520097542.5U CN201520097542U CN204510230U CN 204510230 U CN204510230 U CN 204510230U CN 201520097542 U CN201520097542 U CN 201520097542U CN 204510230 U CN204510230 U CN 204510230U
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CN
China
Prior art keywords
foundation pit
pile
supporting
steel sheet
larsen steel
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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.)
Expired - Fee Related
Application number
CN201520097542.5U
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Chinese (zh)
Inventor
张国龙
张旭光
鲁军
蔡挺
聂克非
梁王彤
赵丽鲜
张鸿
杨华强
徐晔
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China Railway Sixth Group Co Ltd
Road and Bridge Construction Co Ltd of China Railway Sixth Group Co Ltd
Original Assignee
China Railway Sixth Group Co Ltd
Road and Bridge Construction Co Ltd of China Railway Sixth Group Co Ltd
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Application filed by China Railway Sixth Group Co Ltd, Road and Bridge Construction Co Ltd of China Railway Sixth Group Co Ltd filed Critical China Railway Sixth Group Co Ltd
Priority to CN201520097542.5U priority Critical patent/CN204510230U/en
Application granted granted Critical
Publication of CN204510230U publication Critical patent/CN204510230U/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Abstract

The utility model relates to pattern foundation pit supporting structure field, be specially a kind of rich groundwater and the bad deep pit digging supporting and protection structure of geology, solving existing foundation pit construction, to there is supporting effect undesirable, bulk strength is poor, construction period is long, high in cost of production problem, comprise the dewatering well laid along foundation ditch outside spacers suitable for reading, the foundation pit supporting pile laid along foundation ditch end opening circumferentially-spaced and interval are laid in the Larsen steel sheet pile outside foundation pit supporting pile stake limit, i iron crossbeam is provided with between foundation pit supporting pile and Larsen steel sheet pile, each foundation pit supporting pile side opening establishes locating hole, locating hole interpolation establishes spacer bars, i iron cross beam water flatrack is located on spacer bars, Larsen steel sheet pile welds with i iron cross rail outer, adopt well-points dewatering, the Composite Supporting System that Larsen steel sheet pile and foundation pit supporting pile are formed, both ensure that the safety of deep foundation pit construction, also ensure that the duration, greatly reduce construction cost again, create good economic benefit and social benefit.

Description

Rich groundwater and the bad deep pit digging supporting and protection structure of geology
Technical field
The utility model relates to pattern foundation pit supporting structure field, is specially a kind of rich groundwater and the bad deep pit digging supporting and protection structure of geology.
Background technology
, excavation of foundation pit area poor at geological condition is large, cutting depth is comparatively dark, groundwater table is shallow and the water yield such as to enrich at the engineering constructions such as structure base, frame bridge and pipeline under specific condition; how to guarantee that deep pit monitor becomes the most important thing; consider other factors such as duration, economic benefit again; select rational Support of Foundation Pit Excavation method to coordinate dewatering measure, guarantee that excavation of foundation pit one-shot forming just seems particularly important.
Generally foundation ditch usually adopts the mode of putting slope excavation, the suitable gradient is selected according to geological conditions, the construction plant required due to this method is large, the earth volume of excavation is large, and need to draw water in a large number, so just employing during general excavation of foundation pit only within the 6m degree of depth, the method that the excavation of foundation pit being deeper than 6m generally adopts i iron cofferdam to protect, the method forms retaining wall body by the connection in length and breadth of i iron, globality is poor, stagnant water effect is general, sometimes also high-pressure rotary jet grouting pile can be adopted for this reason, cement mixing pile water stopping curtain coordinates H-shaped steel supporting.But above-mentioned several supporting method is poor at geological condition, excavation of foundation pit area is large, cutting depth is comparatively dark, groundwater table is shallow and foundation pit construction under the specific condition such as the water yield is enriched, interchange operation is many time, all have that supporting effect is undesirable, bulk strength is poor, the construction period is long, high in cost of production problem.
Summary of the invention
In order to solve existing pattern foundation pit supporting structure mode, the utility model to exist for the foundation pit construction of described specific condition that supporting effect is undesirable, bulk strength is poor, the construction period is long, high in cost of production problem, provide a kind of rich groundwater and the bad deep pit digging supporting and protection structure of geology.
The utility model adopts following technical scheme to realize: rich groundwater and the bad deep pit digging supporting and protection structure of geology, comprise the dewatering well laid along foundation ditch outside spacers suitable for reading, the foundation pit supporting pile laid along foundation ditch end opening circumferentially-spaced and interval are laid in the Larsen steel sheet pile outside foundation pit supporting pile stake limit, i iron crossbeam is provided with between foundation pit supporting pile and Larsen steel sheet pile, each foundation pit supporting pile side opening establishes locating hole, locating hole interpolation establishes spacer bars, i iron cross beam water flatrack is located on spacer bars, Larsen steel sheet pile welds with i iron cross rail outer.
Described i iron crossbeam is made up of two-layer up and down, between the top being connected to foundation pit supporting pile and Larsen steel sheet pile and bottom; Connecting hole is offered at described every root i iron crossbeam two ends, adopts bolt and steel plate to connect between adjacent i iron crossbeam.Foundation pit supporting pile and Larsen steel sheet pile upper and lower all adopt i iron crossbeam to be connected as a single entity, and between adjacent i iron crossbeam, secondary bolt and the steel plate wanted connects, and the bulk strength of further strengthening supporting system, ensures deep pit monitor.
Adopt structure design of the present utility model, adopt well-points dewatering, the Composite Supporting System that Larsen steel sheet pile and foundation pit supporting pile are formed, make use of the water proof effect of Larsen steel sheet pile on the one hand, serve the effect of water-stop curtain, there is the double action of supporting simultaneously, foundation pit supporting pile is utilized to coordinate the shearing resistance effect of crossbeam on the other hand, reduce steel sheet pile lateral displacement, reduce steel sheet-pile deformation, well-points dewatering simultaneously drops to the water level of the certain area around foundation ditch minimum, reduce water content of soil, reduce excavation slope soil body lateral pressure, guarantee deep pit monitor, both ensure that the safety of deep foundation pit construction, also ensure that the duration, greatly reduce construction cost again, create good economic benefit and social benefit, be applicable to geological condition difference, excavation of foundation pit area is large, about cutting depth 10m, the groundwater table shallow and water yield such as to enrich at the structure base under specific condition, the engineering construction such as frame bridge and pipeline.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model;
Fig. 2 is the syndeton schematic diagram of Larsen steel sheet pile and foundation pit supporting pile in Fig. 1;
Fig. 3 is the top view of Fig. 2;
In figure: 1-foundation ditch is suitable for reading; 2-dewatering well; 3-foundation ditch end opening; 4-foundation pit supporting pile; 5-Larsen steel sheet pile; 6-i iron crossbeam; 7-spacer bars; 8-excavation slope.
Detailed description of the invention
Rich groundwater and the bad deep pit digging supporting and protection structure of geology, as shown in Figure 1, comprise the dewatering well 2 laid along foundation ditch 1 outside spacers suitable for reading, the foundation pit supporting pile 4 laid along foundation ditch end opening 3 circumferentially-spaced and interval and be laid in Larsen steel sheet pile 5 outside foundation pit supporting pile stake limit, as shown in Figure 2,3, i iron crossbeam 6 is provided with between foundation pit supporting pile and Larsen steel sheet pile, each foundation pit supporting pile side opening establishes locating hole, locating hole interpolation establishes spacer bars 7, i iron cross beam water flatrack is located on spacer bars, and Larsen steel sheet pile welds with i iron cross rail outer.I iron crossbeam 6 is made up of two-layer up and down, and between the top being connected to foundation pit supporting pile and Larsen steel sheet pile and bottom, connecting hole is offered at every root i iron crossbeam 6 two ends, adopts bolt and steel plate to connect between adjacent i iron crossbeam.
During Specific construction, can following steps be adopted:
1, well-points dewatering
Adopt well-points dewatering dewatering around foundation ditch and within the scope of foundation ditch, dewatering well spacing 8m around foundation ditch, well depth 17m, arrange along foundation ditch outside 2.5m suitable for reading, dewatering well spacing 15m within the scope of foundation ditch, well depth 12m.Dewatering well drilling diameter >=40 ㎝, adopt concrete chimney filter pit shaft, pit shaft outsourcing geotextiles, fills out stone fragment between pit shaft and the borehole wall, ensures the seepage rate of dewatering well, adopts foul water pump or submersible pump to draw water.
(1) excavate after first precipitation, foundation pit dewatering starts after 7 days to carry out soil excavation, and in Excavation Process, remain that precipitation speed is ahead of a rate of advance, groundwater table is down to after below substrate and is excavated;
(2) Application of light well point precipitation should often check, its water outlet rule is answered " first big after small, first muddy rear clear ", if there are abnormal conditions, should check in time;
(3) draw water and should carry out continuously, particularly start pumping phase, time the stopping time take out, the filter screen of well-point pipe can be caused to block.Simultaneously because midway stops pumping for a long time, cause groundwater table to rise, the accidents such as excavation slope landslide may be caused.
2, foundation pit supporting pile
Foundation ditch props up sheet pile and adopts Ф 1.2m bored pile, churning driven pore-forming, and pile body is C25 concrete, joins reinforcing cage, pile spacing 8m, and with foundation ditch bottom surface for line of demarcation, the above 6m in foundation ditch bottom surface, following 9m, ensure that pile body is stablized.Soldier pile construction technical requirement requires identical with drilled pile.
3, inserted to play Larsen steel sheet pile
Adopt the supporting of 12m long Larsen steel sheet pile, more than at the bottom of foundation ditch and be 6m below, Larsen steel sheet pile adopts the injection of crawler type vibro driver, is first familiar with the situations such as underground utilities before injection, accurately releases soldier pile center line, and precision is squeezed in control;
Steel sheet pile arranges 55 ㎝ places outside soldier pile stake limit, and stake leans the i iron cross rail outer at soldier pile.
4, Larsen steel sheet pile and i iron crossbeam are fixed
Before excavation of foundation pit, lie against between foundation pit supporting pile and Larsen steel sheet pile by long for 12m I50 i iron crossbeam, side is resisted against on foundation pit supporting pile, and Larsen steel sheet pile is resisted against i iron crossbeam opposite side, and i iron crossbeam arranges two-layer up and down.In the punching of foundation pit supporting pile side, insert Ф 32 ㎜ reinforcing bar 2 as spacer bars, insert concrete 20 ㎝, expose 10 ㎝, i iron crossbeam lies against on spacer bars; For ensureing the stable of i iron crossbeam, Larsen steel sheet pile, i iron crossbeam, spacer bars can be welded and fixed; I iron crossbeam punching two ends, adopts steel plate and bolt to connect, foundation pit supporting pile whole around foundation ditch is linked to be entirety, makes itself and Larsen steel sheet pile form a stronger support system, guarantees deep pit monitor.

Claims (3)

1. a rich groundwater and the bad deep pit digging supporting and protection structure of geology, it is characterized in that comprising the dewatering well (2) laid along foundation ditch (1) suitable for reading outside spacers, the foundation pit supporting pile (4) laid along foundation ditch end opening (3) circumferentially-spaced and interval are laid in the Larsen steel sheet pile (5) outside foundation pit supporting pile stake limit, i iron crossbeam (6) is provided with between foundation pit supporting pile and Larsen steel sheet pile, each foundation pit supporting pile side opening establishes locating hole, locating hole interpolation establishes spacer bars (7), i iron cross beam water flatrack is located on spacer bars, Larsen steel sheet pile welds with i iron cross rail outer.
2. rich groundwater according to claim 1 and the bad deep pit digging supporting and protection structure of geology, is characterized in that i iron crossbeam (6) is made up of two-layer up and down, between the top being connected to foundation pit supporting pile and Larsen steel sheet pile and bottom.
3. rich groundwater according to claim 1 and 2 and the bad deep pit digging supporting and protection structure of geology, is characterized in that connecting hole is offered at every root i iron crossbeam (6) two ends, adopts bolt and steel plate to connect between adjacent i iron crossbeam.
CN201520097542.5U 2015-02-11 2015-02-11 Rich groundwater and the bad deep pit digging supporting and protection structure of geology Expired - Fee Related CN204510230U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201520097542.5U CN204510230U (en) 2015-02-11 2015-02-11 Rich groundwater and the bad deep pit digging supporting and protection structure of geology

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201520097542.5U CN204510230U (en) 2015-02-11 2015-02-11 Rich groundwater and the bad deep pit digging supporting and protection structure of geology

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CN204510230U true CN204510230U (en) 2015-07-29

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106284387A (en) * 2016-08-11 2017-01-04 中国建筑第八工程局有限公司 Steel sheet pile dewatering well structure
CN106436717A (en) * 2016-07-22 2017-02-22 江苏科兴项目管理有限公司 Impervious curtain river-near foundation pit adopting dewatering wells and design method
CN108755702A (en) * 2018-06-22 2018-11-06 中水北方勘测设计研究有限责任公司 A kind of higher soft soil foundation foundation ditch strengthening processing method of level of ground water
CN110468729A (en) * 2019-09-09 2019-11-19 中铁八局集团第六工程有限公司 A kind of frame bridge construction method
CN111749247A (en) * 2020-06-30 2020-10-09 中国二冶集团有限公司 Construction method for pipeline deep foundation pit support
CN112609680A (en) * 2020-12-10 2021-04-06 中国十九冶集团有限公司 Construction method for manual hole digging pile group excavation

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106436717A (en) * 2016-07-22 2017-02-22 江苏科兴项目管理有限公司 Impervious curtain river-near foundation pit adopting dewatering wells and design method
CN106284387A (en) * 2016-08-11 2017-01-04 中国建筑第八工程局有限公司 Steel sheet pile dewatering well structure
CN106284387B (en) * 2016-08-11 2018-12-18 中国建筑第八工程局有限公司 Steel sheet pile precipitation well construction
CN108755702A (en) * 2018-06-22 2018-11-06 中水北方勘测设计研究有限责任公司 A kind of higher soft soil foundation foundation ditch strengthening processing method of level of ground water
CN110468729A (en) * 2019-09-09 2019-11-19 中铁八局集团第六工程有限公司 A kind of frame bridge construction method
CN110468729B (en) * 2019-09-09 2021-08-17 中铁八局集团昆明铁路建设有限公司 Construction method of frame bridge
CN111749247A (en) * 2020-06-30 2020-10-09 中国二冶集团有限公司 Construction method for pipeline deep foundation pit support
CN112609680A (en) * 2020-12-10 2021-04-06 中国十九冶集团有限公司 Construction method for manual hole digging pile group excavation

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CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20150729

Termination date: 20200211

CF01 Termination of patent right due to non-payment of annual fee