CN101245602A - Construction technique for pits in foundation-pit support system - Google Patents
Construction technique for pits in foundation-pit support system Download PDFInfo
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- CN101245602A CN101245602A CNA2008100611705A CN200810061170A CN101245602A CN 101245602 A CN101245602 A CN 101245602A CN A2008100611705 A CNA2008100611705 A CN A2008100611705A CN 200810061170 A CN200810061170 A CN 200810061170A CN 101245602 A CN101245602 A CN 101245602A
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- hole
- support system
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- open caisson
- pit
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Abstract
The invention discloses a construction technique of a pit tangent system in a pit, which includes the following steps of: taking measurement and calculating the intensity, the rigidity, the friction force and the subsidence factor of the tangent system - leveling of ground and measuring paying off - spreading a sand cushion and stow-wood - building a cutting edge and a brickwork base - making and erecting the tangent system - extracting the stow-wood - subsidising excavation to the design depth - injecting a concrete cushion - constructing on the tunnel wall of structural concrete; the tangent system is made and erected by adopting an open caisson. The construction technique has small construction occupying area, the operating space is not influenced by the surrounding environment, and the construction speed is high so as to ensure the soil body at the periphery not to be disturbed, the bearing capacity of the soil body not to be affected and the consumption of templates to be saved; furthermore, the structure has the characteristics of strong integrity, strong rigidity, high bearing capacity, and reducing the influence of the pit construction in the pit on the stability and the deformation of the retaining and protecting for foundation excavation.
Description
Technical field
The present invention relates to the construction technology of hole support system in a kind of hole.
Background technology
Along with the development of builing industry, the comprehensive utilization of land resources, hole construction phenomenon becomes general all the more in the hole, especially cheats in the weak soil deep foundation ditch, has increased the difficulty of construction supporting greatly.What the employing of the traditional handicraft of hole supporting was more in the hole is: support technologies such as brick loose tool, pine stake, steel sheet pile, but the hole is when big pattern foundation pit supporting structure is nearer in the hole, big machinery is difficult to operation, and stake reclaims that a difficulty maybe can't reclaim, globality is poor, rigidity is little, bearing capacity is low, unstable, yielding and floor space big, construction complexity, mechanical oscillation are also influential to big pattern foundation pit supporting structure.And the hole supporting scheme is often out in the cold in Foundation Pit Support Design in the hole, and the hole excavation causes the accident of collapsing in big pattern foundation pit supporting structure part to occur repeatedly in the hole.
Summary of the invention
The object of the present invention is to provide the construction technology of cheating support system in a kind of hole, loose tool outside employing open caisson barrel is held concurrently as the support system in hole in the hole.It is little that this technology has a construction area area, the operating space is not influenced by surrounding enviroment, speed of application is fast, guarantee that the peripheral soil body not by disturbance, does not influence soil bearing capacity, save the template consumption, and this structural integrity is strong, rigidity is big, bearing capacity height, the characteristics of the influence that the hole construction is stablized and is out of shape pattern foundation pit supporting structure in can reducing to cheat.
In order to achieve the above object, technical scheme of the present invention is:
The construction technology of hole support system in a kind of hole, comprise the steps: the measuring and calculating → smooth place of support system intensity, rigidity, frictional force, subsidence factor, measurement unwrapping wire → sanding bed course and chock → block sword pin brick seat → support system is made and is set up → extract out chock → shoveling and sinks to projected depth → concreting bed course → structural concrete barrel construction, and described support system is made and set up and adopts open caisson manufacture and set up.
Described open caisson pit shaft template adopts the thick wooden form of 18mm, and builds with concrete delamination, symmetry, and open caisson need not back cover.
Described concrete delamination thickness is generally 200-300mm.
Also added early strength admixture in the described concrete.
Beneficial effect of the present invention is: to have a construction area area little for the construction technology of hole support system in the hole that the present invention adopts, and the operating space is not influenced by surrounding enviroment.Open caisson makes it to sink down into design elevation by means of its deadweight, need not the plant by complexity, can construct under the narrow strip part of place, has overcome other pile foundation machinery because of insufficient space, the difficult point that soft foundation can't install; Secondly with piling, put the slope and compare, can significantly reduce dig, the earth volume of fortune, backfill, therefore, accelerate speed of application, guarantee that the peripheral soil body not by disturbance, does not influence soil bearing capacity; And this structural integrity is strong, and rigidity is big, bearing capacity height, the influence that the hole construction is stablized and is out of shape pattern foundation pit supporting structure in can reducing to cheat; Compare with traditional open caisson construction, this open caisson concrete tube wall is as the support system in hole in the hole, rather than the structural concrete barrel, and open caisson need not back cover, so reduced difficulty of construction, waterproof requirement is low; Open caisson concrete tube wall double as is the outside loose tool of structure barrel simultaneously, saves the template consumption.This construction technology is applicable to that the hole is as the construction of engineerings such as elevator shaft, pond, dark cushion cap, underground sedimentation basin, large equipment base near the weak soil deep foundation ditch in the underground structure hole, also applicable to building the equipment deep foundation that to set up according to the technological transformation requirement in the industrial building, the construction of engineerings such as pond.
The specific embodiment
Embodiment 1
The construction technology of hole support system in a kind of hole of present embodiment indication, comprise the steps: the measuring and calculating → smooth place of support system intensity, rigidity, frictional force, subsidence factor, measurement unwrapping wire → sanding bed course and chock → block sword pin brick seat → support system is made and is set up → extract out chock → shoveling and sinks to projected depth → concreting bed course → structural concrete barrel construction, and described support system is made and set up and adopts open caisson manufacture and set up.
Before making open caisson, the measuring and calculating of support system intensity, rigidity, frictional force, subsidence factor with Rankine's earth pressure theory design open caisson barrel arrangement of reinforcement, to satisfy the strength and stiffness as support system, guarantees the safety of open caisson supporting.Calculate the segmentation frictional resistance of well sinking and the subsidence factor of segmentation again, whether as judging that each stage could sink, it is prominent heavy to occur, and definite sinking method and take corresponding measure.Subsidence factor is used more than the 1.15-1.25 usually, to guarantee smooth sinking.In the time can not meeting the demands, stacking material such as sand bag at borehole wall top increases additional loading (must notice that distribution of material wants evenly, otherwise cause easily that well sinking is inhomogeneous and tilt); Or between the borehole wall and native wall, inject water or sand, to reduce the measures such as frictional force of sinking.When the sinking coefficient is big, can increase total frictional force along corresponding cubic metre of earth of the peripheral backfill of the borehole wall.As the support system in hole in the hole, take the sinking of producing once as far as possible, to simplify procedures, shorten the activity duration.
Smooth then place, measure unwrapping wire: earlier the place is flattened, remove the obstruction of influence construction, operation is based on manually, and machinery is auxilliary; Make the position of cheating in the hole with gray line at the construction field (site) by design drawing, and center line control stake is squeezed on four limits, hole between two parties in the hole,, adopt transit to check during the location, accurately make and cheat axial location in the hole to treat monitoring horizontal movement deviation in the sinking process.
Next sanding bed course and chock: in tamping smooth and oriented foundation ditch, (adopt medium coarse sand along shop, the borehole wall border thick sand cushion of 100mm through compacting, bandwidth 1.2m), symmetrical laying chock (deal board of 800mm * 300mm * 50mm) on sand cushion again, spacing 0.5m, tamp with sand in the space between the chock, props up sword pin and pit shaft template then in the above.
Begin to build sword pin brick seat afterwards: sand cushion and chock grout the MU10 standard brick with the M5.0 cement bonded sand thereon and do base after laying and finishing, and with 1: 2.5 cement sand plaster, treat cement mortar sclerosis back brush interleaving agent.Considering needs after the sword pin to remove, and whenever when base is built by laying bricks or stones establishes the 20mm space along Mi Liu.Sword pin peripheral edge portion is given prominence to 70mm, and borehole wall surface makes 1% gradient with the power of reducing friction.
Just begin open caisson manufacture then: open caisson pit shaft template adopts the thick wooden form of 18mm, in advance by design size well cutting template, reinforces spacing 250mm with the upright shelves of 80 * 60mm lumps of wood.Install the pit shaft inner formword earlier, treat that reinforcing bar binding finishes after, seal exterior sheathing again, open caisson need not back cover, is equipped with 2 φ, 48 * 3.5 steel pipe clamps tensions template with φ 12 Screw arbor with nut at both-ends.Reinforcing bar machining moulding at the scene, it is in place to carry out vertical lifting with pillar crane, artificial colligation.Then concreting along barrel comprehensively, layering, symmetry, friendship circle evenly carry out, lift height is generally 200-300mm, with plug-in type vibrating head vibration compacting, each layer time of building should be not more than the concrete initial setting time.As the support system in hole in the hole, taking produces once as far as possible finishes, and for shortening concrete curing time, reduces the intermittent time, mixes early strength admixture in concrete, treat concrete reach design strength 50% after just can sink.
Moreover will extract chock out: 50% back that concrete reaches design strength is extracted the chock of caisson cutting edge out, successively symmetry, synchronously carry out, per 2 one group, the chock of sword underfooting is extracted out.Whenever take out one group, the back-up sand tamping immediately of sword underfooting is to bear the gravity of part pit shaft.Then remove another group, carry out so successively.
Will cut the earth then and sink to projected depth (comprising draining, monitoring, correction): chock is removed back sword pin under pit shaft deadweight effect and is steadily thrust sand cushion.Limited by the sand cushion ultimate bearing capacity, open caisson still remains static, the sinking of can cutting the earth subsequently.The method construction of artificial digging machine handling is adopted in the earthwork.Manually in well, cut the earth, begin to dig to periphery from the centre, every layer of shoveling thickness 0.2-0.4m, stay the wide earthen platform of 0.5-1m at sword pin place, successively toward sword pin direction skiving soil layer, everyone is responsible for 2-3m, cuts 150-200mm at every turn, when native ridge can't stop the extruding of sword pin and breaks, the open caisson sinking of just under the deadweight effect, breaking ground.
When open caisson began sinking and will be sink to design elevation, peripheral cutting depth should be less than 200mm.When especially initially sinking, it is correct that its plan-position and verticality will be paid special attention to keep, otherwise continue to sink to being difficult for to adjust.From the projected depth 100mm left and right sides time, stop to fetch earth, rely on deadweight slowly to sink down into design elevation.
Adopt bright drainage sink: establish a collecting well 300 * 300 * 300 between two parties at open caisson, the shaft bottom degree of depth is cut the earth with open caisson and is constantly deepened, and establishes water pump in well or on the borehole wall, and underground water is discharged outside the well.
Open caisson monitoring is carried throughout, and ground is provided with in length and breadth that cross control stake comes the observation water mean place to be offset well outside, ejects the vertical line of ink marker in the well inwall quartering, respectively hangs one of plumb bob, observes the open caisson verticality, when plumb bob departs from the line of ink marker, promptly should correct.In the well sinking process, after 30-50cm whenever digs in every shift, at least once, and after each sinking, check, carry out record with measuring apparatus observation.When finding inclination, displacement, when the value of reversing exceeds requirement, in time taking corrective action.
Carry out the concreting bed course then: after treating that well sinking is stable, by designing requirement concreting bed course, thickness 100mm-150mm, intensity C15, plain concrete.
At last the structural concrete barrel is constructed: press designing requirement constructing structure concrete tube wall as outside loose tool by the open caisson barrel.
Claims (4)
1, the construction technology of hole support system in a kind of hole, comprise the steps: the measuring and calculating → smooth place of support system intensity, rigidity, frictional force, subsidence factor, measure unwrapping wire → sanding bed course and chock → blocks sword pin brick seat → support system and make and set up → extracts chock → shovelings and sink to projected depth → concreting bed course → structural concrete barrel construction, it is characterized in that described support system making and set up the employing open caisson manufacture and set up.
2, the construction technology of hole support system in the hole as claimed in claim 1, it is characterized in that: described open caisson pit shaft template adopts the thick wooden form of 18mm, and builds with concrete delamination, symmetry, and open caisson need not back cover.
3, the construction technology of hole support system in the hole as claimed in claim 1, it is characterized in that: described concrete delamination thickness is generally 200-300mm.
4, the construction technology of hole support system in the hole as claimed in claim 1 is characterized in that: also added early strength admixture in the described concrete.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2008100611705A CN100572686C (en) | 2008-03-13 | 2008-03-13 | The construction technology of hole support system in the hole |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2008100611705A CN100572686C (en) | 2008-03-13 | 2008-03-13 | The construction technology of hole support system in the hole |
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| Publication Number | Publication Date |
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| CN101245602A true CN101245602A (en) | 2008-08-20 |
| CN100572686C CN100572686C (en) | 2009-12-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2008100611705A Expired - Fee Related CN100572686C (en) | 2008-03-13 | 2008-03-13 | The construction technology of hole support system in the hole |
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101787709A (en) * | 2010-03-10 | 2010-07-28 | 江苏省电力设计院 | Construction method for concrete gravity buttress retaining wall |
| CN101864773A (en) * | 2010-04-14 | 2010-10-20 | 江苏江中集团有限公司 | Deep foundation pit support process |
| CN102477744A (en) * | 2010-11-23 | 2012-05-30 | 中国二十冶集团有限公司 | Pit excavation method in large-area pit with internal support under condition of soft soil foundation |
| CN102635124A (en) * | 2012-04-23 | 2012-08-15 | 浙江省建工集团有限责任公司 | Construction method aiming to large open caisson in weak soil area |
| CN103015456A (en) * | 2011-09-21 | 2013-04-03 | 五冶集团上海有限公司 | Rapid pit-in-pit form erecting method in foundation slab of buried concrete structure |
| CN103290849A (en) * | 2013-06-20 | 2013-09-11 | 江苏城市职业学院 | Pit-in-pit supporting structure of half topdown construction method and construction method thereof |
| CN104264681A (en) * | 2014-08-26 | 2015-01-07 | 中国二十冶集团有限公司 | Interior-support-free support method for sluiceway foundation pit of rolling line |
| CN104947677A (en) * | 2014-03-28 | 2015-09-30 | 中国二十冶集团有限公司 | Rapid cofferdam filling construction method for pit in pit |
| CN106759372A (en) * | 2016-11-12 | 2017-05-31 | 中国二十二冶集团有限公司 | Deep basal pit bank protection, the construction method of precipitation integrated construction nearer apart from side slope |
| CN106760620A (en) * | 2016-12-27 | 2017-05-31 | 同济大学 | A kind of utilization open caisson increases the construction method for building the underground space under existing building |
| CN107938681A (en) * | 2017-11-26 | 2018-04-20 | 上海宝冶集团有限公司 | Way after concrete sump |
| CN110093971A (en) * | 2019-04-26 | 2019-08-06 | 中铁第四勘察设计院集团有限公司 | The Combined water pump house and its construction method of subterranean tunnel |
| CN112982424A (en) * | 2021-02-01 | 2021-06-18 | 中国电建集团市政规划设计研究院有限公司 | Open caisson construction method |
| CN112982422A (en) * | 2021-02-01 | 2021-06-18 | 中国电建集团市政规划设计研究院有限公司 | Sectional type open caisson construction method |
| CN114809010A (en) * | 2022-05-06 | 2022-07-29 | 山西三建集团有限公司 | Construction method of elevator shaft and sump foundation retaining wall in easily-collapsed soil |
| CN115897636A (en) * | 2022-07-21 | 2023-04-04 | 博尔建设集团有限公司 | Water-rich geological suspension steel caisson pit-in-pit precipitation-free pouring construction method |
-
2008
- 2008-03-13 CN CNB2008100611705A patent/CN100572686C/en not_active Expired - Fee Related
Cited By (26)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101787709B (en) * | 2010-03-10 | 2012-04-25 | 江苏省电力设计院 | Construction method for concrete gravity buttress retaining wall |
| CN101787709A (en) * | 2010-03-10 | 2010-07-28 | 江苏省电力设计院 | Construction method for concrete gravity buttress retaining wall |
| CN101864773A (en) * | 2010-04-14 | 2010-10-20 | 江苏江中集团有限公司 | Deep foundation pit support process |
| CN101864773B (en) * | 2010-04-14 | 2011-11-30 | 江苏江中集团有限公司 | Deep foundation pit support process |
| CN102477744B (en) * | 2010-11-23 | 2014-04-30 | 中国二十冶集团有限公司 | Pit excavation method in large-area pit with internal support under condition of soft soil foundation |
| CN102477744A (en) * | 2010-11-23 | 2012-05-30 | 中国二十冶集团有限公司 | Pit excavation method in large-area pit with internal support under condition of soft soil foundation |
| CN103015456B (en) * | 2011-09-21 | 2015-05-06 | 五冶集团上海有限公司 | Rapid pit-in-pit form erecting method in foundation slab of buried concrete structure |
| CN103015456A (en) * | 2011-09-21 | 2013-04-03 | 五冶集团上海有限公司 | Rapid pit-in-pit form erecting method in foundation slab of buried concrete structure |
| CN102635124B (en) * | 2012-04-23 | 2014-12-03 | 浙江省建工集团有限责任公司 | Construction method aiming to large open caisson in weak soil area |
| CN102635124A (en) * | 2012-04-23 | 2012-08-15 | 浙江省建工集团有限责任公司 | Construction method aiming to large open caisson in weak soil area |
| CN103290849A (en) * | 2013-06-20 | 2013-09-11 | 江苏城市职业学院 | Pit-in-pit supporting structure of half topdown construction method and construction method thereof |
| CN103290849B (en) * | 2013-06-20 | 2015-03-04 | 江苏城市职业学院 | Pit-in-pit supporting structure of half topdown construction method and construction method thereof |
| CN104947677A (en) * | 2014-03-28 | 2015-09-30 | 中国二十冶集团有限公司 | Rapid cofferdam filling construction method for pit in pit |
| CN104264681A (en) * | 2014-08-26 | 2015-01-07 | 中国二十冶集团有限公司 | Interior-support-free support method for sluiceway foundation pit of rolling line |
| CN104264681B (en) * | 2014-08-26 | 2016-03-30 | 中国二十冶集团有限公司 | Rolling line sluice foundation ditch is without inner support supporting method |
| CN106759372A (en) * | 2016-11-12 | 2017-05-31 | 中国二十二冶集团有限公司 | Deep basal pit bank protection, the construction method of precipitation integrated construction nearer apart from side slope |
| CN106760620A (en) * | 2016-12-27 | 2017-05-31 | 同济大学 | A kind of utilization open caisson increases the construction method for building the underground space under existing building |
| CN106760620B (en) * | 2016-12-27 | 2019-03-29 | 同济大学 | It is a kind of to increase the construction method for building the underground space under existing building using open caisson |
| CN107938681A (en) * | 2017-11-26 | 2018-04-20 | 上海宝冶集团有限公司 | Way after concrete sump |
| CN110093971A (en) * | 2019-04-26 | 2019-08-06 | 中铁第四勘察设计院集团有限公司 | The Combined water pump house and its construction method of subterranean tunnel |
| CN112982424A (en) * | 2021-02-01 | 2021-06-18 | 中国电建集团市政规划设计研究院有限公司 | Open caisson construction method |
| CN112982422A (en) * | 2021-02-01 | 2021-06-18 | 中国电建集团市政规划设计研究院有限公司 | Sectional type open caisson construction method |
| CN114809010A (en) * | 2022-05-06 | 2022-07-29 | 山西三建集团有限公司 | Construction method of elevator shaft and sump foundation retaining wall in easily-collapsed soil |
| CN114809010B (en) * | 2022-05-06 | 2023-08-18 | 山西三建集团有限公司 | Construction method of elevator shaft and pit foundation retaining wall in easy-collapse soil |
| CN115897636A (en) * | 2022-07-21 | 2023-04-04 | 博尔建设集团有限公司 | Water-rich geological suspension steel caisson pit-in-pit precipitation-free pouring construction method |
| CN115897636B (en) * | 2022-07-21 | 2023-12-19 | 博尔建设集团有限公司 | Precipitation-free pouring construction method for pits in water-rich geological suspension steel caisson pit |
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|---|---|
| CN100572686C (en) | 2009-12-23 |
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