CN109680703A - Soft Soil Layer open caisson construction method - Google Patents
Soft Soil Layer open caisson construction method Download PDFInfo
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- CN109680703A CN109680703A CN201811597631.0A CN201811597631A CN109680703A CN 109680703 A CN109680703 A CN 109680703A CN 201811597631 A CN201811597631 A CN 201811597631A CN 109680703 A CN109680703 A CN 109680703A
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- open caisson
- sinking
- caisson
- soil layer
- mixing pile
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/10—Deep foundations
- E02D27/20—Caisson foundations combined with pile foundations
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D23/00—Caissons; Construction or placing of caissons
- E02D23/08—Lowering or sinking caissons
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The invention discloses a kind of Soft Soil Layer open caisson construction methods, by cement mixing pile being arranged and before well sinking in open caisson periphery bored grouting in caisson cutting edge bottom in advance, ensure open caisson during being sunk using drainage open caisson with the earthwork dug transport after can uniform, controllable drown oneself, to avoid open caisson that super heavy and heavy problem of dashing forward occurs in sinking watching, when well sinking to cement mixing stake top, mixing pile is successively abolished by uniform intervals, and it synchronizes and is uniformly arranged big sand pocket, off-load is carried out using the sand pocket i.e. sandbox effect for filling sand to drown oneself, realize open caisson safety, uniform controlled sinking, prevent open caisson from substantially sinking and tilting.The Soft Soil Layer open caisson construction method, construction technology is convenient and reliable, materials are convenient, work progress is safe and reliable, it targetedly solves because in Soft Soil Layer construction open caisson bring safe mass risk problem, ensure the construction quality and safety of open caisson, and construction cost is significantly reduced, meet national energy-saving environmental requirement.
Description
Technical field
The present invention relates to a kind of Soft Soil Layer open caisson construction methods.
Background technique
Caisson structure object is on the ground and melt pit for building open caisson, and first production opening armored concrete pit shaft, accomplishes complete
High or Partial Height (when merogenesis), after reaching some strength, manually or machinery is constantly layered shoveling, muck haulage in pit shaft, with
In well native face gradually decrease, open caisson stack shell borrows its self weight (or under imposed load effect) to overcome frictional force and sword between soil wall
The resistance of underfooting soil, constantly cuts native sinking.When merogenesis being taken to make, then during well-sinking or in each stage of sinking,
Increase pit shaft section by section, continue to cut the earth, loop back and forth like this, after pit shaft blade foot reaches designed elevation, carries out substrate shaping,
Casting concrete bed course and reinforced concrete floor back cover.
If carrying out major diameter open caisson construction in soft soil layer, because the Soft Soil Layer on open caisson periphery has natural moisture content height, hole
Gap than big, bad hydraulic permeability, compressibility is high, intensity is low the features such as, open caisson open caisson bottom foundation bearing capacity during sinking construction
Be not enough to carry the self weight of top open caisson and cause open caisson super heavy and inclination etc. safe masses problem.
Summary of the invention
The quality problems that major diameter open caisson construction is likely to occur are carried out in Soft Soil Layer, the invention proposes a kind of weak soils
Layer open caisson construction method, it is therefore an objective to major diameter open caisson be made to avoid that inclination of open caisson and the super quality such as heavy occur when soft soil layer sinks
Problem makes open caisson smoothly be sink to designed elevation position.Specifically adopt the following technical scheme that
Soft Soil Layer open caisson construction method provided by the invention is by being arranged cement mixing pile simultaneously in caisson cutting edge bottom in advance
In open caisson periphery bored grouting before well sinking, it is ensured that open caisson using drainage sink during open caisson with the earthwork
After being transported by digging can uniform, controllable drown oneself, to avoid open caisson that the super heavy and prominent problem sunk occurs in sinking watching, when
When well sinking to cement mixing pile (real stake part) stake top, mixing pile is successively abolished by uniform intervals, and synchronize and uniformly set
Big sand pocket is set, off-load is carried out using the sand pocket i.e. sandbox effect for filling sand and drowns oneself, realize open caisson safety, uniformly controlled sinking, prevent
Only open caisson substantially sinks and tilts.It is utilized, is finally efficiently solved big by the above-mentioned combination to three key measures
Diameter open caisson is in highly difficult technical problems such as prominent heavy, the super heavy and open caisson deflections of soft soil layer.
Advantage: the Soft Soil Layer open caisson construction method, construction technology is convenient and reliable, materials are convenient, work progress is safe and reliable,
It targetedly solves because in Soft Soil Layer construction open caisson bring safe mass risk problem, it is ensured that the construction quality of open caisson
And safety, and construction cost is significantly reduced, meet national energy-saving environmental requirement.
Detailed description of the invention
The drawings described herein are used to provide a further understanding of the present invention, constitutes part of this application, not
Inappropriate limitation of the present invention is constituted, in the accompanying drawings:
Fig. 1 is that plan view is arranged in mixing pile of the embodiment of the present invention；
Fig. 2 is that elevation is arranged in mixing pile of the embodiment of the present invention；
Fig. 3 is mixing pile of embodiment of the present invention supporting caisson schematic diagram；
Fig. 4 is the borehole wall of embodiment of the present invention inlet well plan view；
Fig. 5 is bored grouting of embodiment of the present invention elevation；
Fig. 6 is that plan view is arranged in sand pocket of the embodiment of the present invention；
Fig. 7 is that sand pocket of the embodiment of the present invention abolishes schematic diagram；
Fig. 8 is construction process of embodiment of the present invention schematic diagram.
Specific embodiment
Below in conjunction with attached drawing and specific embodiment, the present invention will be described in detail, herein illustrative examples of the invention
And explanation is used to explain the present invention, but not as a limitation of the invention.
The technology contents, which are mainly included in, makes and controls the technical measures that major diameter open caisson smoothly sinks in soft soil layer.
The technology is mainly passed through preset in advance cement mixing pile and in the slip casting of borehole wall periphery and by being acted on using the sandbox of sand pocket, is changed
Into the process in soft soil layer major diameter open caisson construction, construction process are as follows: preparation of construction → setting mixing pile → excavation of foundation pit →
The outer bored grouting of merogenesis production open caisson → borehole wall → draining shoveling sinks down into stirring stake top → abolishes part mixing pile → blade foot
Sand pocket → abolishing all mixing piles → is symmetrically filled between mixing pile abolishes the stable sinking of sand pocket → open caisson and back cover simultaneously.
The technology mainly combines the purpose for realizing invention by following three key measures:
One, by being equably arranged a certain number of cement mixing piles (see Fig. 1/2/3) in caisson cutting edge bottom in advance, increase
Big caisson cutting edge end Bearing Capacity of Composite Foundation, prevents open caisson super heavy in open caisson.The empty stake of cement mixing pile point and real stake two parts
It is empty stake from 2m above absolute altitude from ground to Sinking Well Design bottom, the following are real stakes for remaining.
Two, before well sinking, around open caisson outer wall bored grouting improvement well Zhou Tuti mechanical property (see Fig. 4/
5), increase external wall friction power, prevent from significantly sinking with bottom mixing pile collective effect, reduce the cost.
Three, when well sinking to stirring stake top, mixing pile is successively abolished by uniform intervals, and synchronize and be uniformly arranged sand
Bag carries out off-load using the sandbox effect of sand pocket and drowns oneself, realizes open caisson safety, uniformly controlled sinking, avoid because having abolished stirring
Occur hanging between stake region and open caisson bottom and open caisson is caused substantially to sink and tilt (see Fig. 6/7).
Specifically, as shown in figure 8, Soft Soil Layer open caisson construction method detailed step of the present invention is as follows:
One, construction procedure
1, preparation of construction
(1) it constructs early period, it is necessary in conjunction with unit, designing institute and local related geology hydrological data is reconnoitred, determine construction ground
Point hydrogeologic condition.
(2) according to " open caisson and Pneumatic Caisson Construction specification " GBT 51130-2016, to open caisson collateral resistance, subsidence factor and
High stability is connect to be checked.Determine that parameter, mixing pile specification, material and setting length is arranged in blade foot by checking.
2, mixing pile is set
(1) line setting work need to be strictly carried out when mixing pile is arranged, and carry out apparent mark in the anchor point determined
Note.
(2) mixing pile the quantity of the cement injected need to carry out monitoring, when pile level difference is excessive, must abolish before open caisson pours
Part stirring pile head, reduces mixing pile elevation difference.When ensuring well sinking to mixing pile position, by the open caisson of mixing pile support
Blade foot bottom surface can be in same level.
(3) mixing pile after pile need to mark on the ground, can be used as reference point when open caisson pours.
(4) economical to save, part sky stake, the construction method of lower part reality stake, mixing pile can be used in mixing pile construction
Real stake top absolute altitude should be higher than that the above 2m of caisson cutting edge floor design absolute altitude.
3, excavation of foundation pit
(1) unwrapping wire on the spot surveying setting-out: is carried out according to drawing and surface traverse using theodolite, level.
(2) foundation pit height about 1m-2m, according to the appropriate slope of live site condition.Bottom of foundation ditch sideline is from open caisson outer wall 2m
Left and right.
(3) bottom of foundation ditch surrounding is arranged the gutter of 30cm × 30cm dimensions above and accesses to sump in foundation pit,
Well depth of catchmenting should be than draining ditch depth 50cm.Sump internal water accumulation will be detached by water pump in time.
(4) usage mining machine carries out excavation of foundation pit according to unwrapping wire range, and the earthwork outer in time should be transported to specified place.
4, open caisson is made
(1) according to live site condition, determine that merogenesis pours the number of open caisson in advance.Determine the setting of plain concrete cushion layer
Parameter.
(2) unwrapping wire on the spot surveying setting-out: is carried out according to drawing and surface traverse using theodolite, level.
(3) blade foot plain concrete cushion layer pours: carrying out plain concrete cushion layer formwork in boundary of works area, pours.It needs stringent
Bed course flatness is controlled, plain concrete cushion layer height and width difference control are within ± 10cm, it is ensured that open caisson can be located after pouring
On maintenance level face.After bed course pours, unwrapping wire is carried out in mat surface and carries out blade foot position mark, improves blade foot
Construction accuracy.
(4) blade foot is arranged: according to drawing or checking determining blade foot setting type, is carried out according to drawing and mat surface label
The binding of blade foot reinforcing bar, formwork and concreting.Pay special attention to reinforce frequency of vibrating when blade foot bottom pours, blade foot pours
Before, filled and process plate can be shifted to an earlier date in the position of reserved bottom plate, blade foot removes cystosepiment after the completion of pouring.
(5) scaffold building: double ground steel pipe scaffold is arranged in open caisson periphery, needs to carry out full hall foot hand on the inside of open caisson
Frame is set up.Scaffold can just be set up after must being checked according to relevant regulations specification.
(6) template is installed: before the installation of open caisson template, it is necessary to be checked according to relevant regulations specification, bearing height is greater than
It need to be expounded through peer review when 8m.
(7) borehole wall pours: borehole wall placement layer by layer is carried out after template is checked and accepted, every layer pours 30-50cm, can adopt simultaneously
It is poured, and is vibrated with 1-3 platform pump truck.
(8) steel plate for sealing water: borehole wall section and section between according to specification be arranged steel plate for sealing water, the steel plate for sealing water lap of splice >=
20cm, interior outside are both needed to be fully welded.
5, it cuts the earth and sinks down into stirring stake top absolute altitude
(1) it abolishes bed course: using manually blade foot two sides of the bottom plain concrete cushion layer is abolished using pneumatic pick, being controlled when abolishing broken
Except dynamics, damage caisson cutting edge is avoided.
(2) construction equipment: visual soil layer situation selects the crawler-mounted excavator of different tonnages.
(3) it cuts the earth: first digging 1m or so bowl-shape soil layer among open caisson, then uniformly take soil around from centre.When taking
Slow down when soil is close to mixing pile and take native speed, open caisson and surrounding soil layer are monitored, open caisson local buckling and deviation are avoided.
6, the outer bored grouting of the borehole wall
(1) line setting: according to soil layer geology and the local hydrology, setting is greater than the boring point of 15 points, hole outside the borehole wall
Diameter is greater than 500mm.Unwrapping wire is carried out outside the borehole wall, orients the position of mixing pile under boring point and blade foot.Drilled edge point needs to paste
Nearly mixing pile stake side.
(2) bored grouting: being drilled in anchor point using drilling machine, and drilling is under blade foot at the absolute altitude of mixing pile stake bottom.
The drilling of all drilled hole point carries out slip casting after finishing, when slip casting selects watertight cement, controls cement mixed weight.
7, mixing pile is abolished
(1) exposure mixing pile: the ring-shaped groove of width a 1m-2m wide, 1m high are excavated in open caisson inner peripheral, makes to stir
Stake is exposed in the visual field.
(2) mixing pile construction equipment: is abolished using hand fit's pneumatic pick.
(3) abolish selection: view open caisson specification, 6-8 point of uniform design will abolish mixing pile in point range as abolishing a little
Abolish by several times.Each point range is abolished to take in 3 mixing piles.
(4) abolish a mixing pile to abolish: every mixing pile single abolishes height in 30-50cm.Same batch abolishes stirring
Stake height must be consistent and measures and adjust after abolishing.
8, sand pocket is set between caisson cutting edge and mixing pile.
(1) after abolishing 6 mixing piles, sand pocket is filled between blade foot and mixing pile.When filling sand pocket and blade foot and
Mixing pile fits closely.
(2) sand pocket compactedness: sand body compactedness is 90% or so in single sand pocket.
(3) material selects: common sand pocket, sand in sand body selection can be selected.
9, remaining mixing pile is abolished
(1) after sand pocket is filled, continue to abolish remaining mixing pile.
(2) abolish absolute altitude: abolish absolute altitude with abolish in a little that abolish absolute altitude consistent.So mixing pile absolute altitude is consistent after abolishing.
(3) rear stake face is abolished so mixing pile highness change is within 5cm.
10, sand pocket is abolished
(1) sand pocket is abolished a little: sand pocket, which is abolished, to be a little selected in the middle part of sand pocket.
(2) it abolishes time unification: a little one staff of each arrangement is being abolished when sand pocket is abolished, by special messenger when sand pocket is abolished
Commander, command signal are synchronized after assigning and are abolished.
10, open caisson stablizes the simultaneously back cover that sinks
(1) by open caisson self weight and sand body mobility, after sand body flows out sand pocket, open caisson can natural stability sinking.
(2) this engineering method 5.2.7 to 5.2.9 is repeated, up to well sinking to designed elevation.Design is sunk down into open caisson stabilization
Bottom sealing is carried out after absolute altitude.
It is provided for the embodiments of the invention technical solution above to be described in detail, specific case used herein
The principle and embodiment of the embodiment of the present invention are expounded, the explanation of above embodiments is only applicable to help to understand this
The principle of inventive embodiments；At the same time, for those skilled in the art, according to an embodiment of the present invention, in specific embodiment party
There will be changes in formula and application range, in conclusion the contents of this specification are not to be construed as limiting the invention.
Claims (2)
1. a kind of Soft Soil Layer open caisson construction method, it is characterised in that:
By the way that a certain number of cement mixing piles are equably arranged in caisson cutting edge bottom in advance, it is compound to increase caisson cutting edge end
Foundation bearing capacity prevents open caisson super heavy in open caisson；
Before well sinking, bored grouting improves well Zhou Tuti mechanical property around open caisson outer wall, increases external wall friction power,
It prevents from significantly sinking with bottom mixing pile collective effect；
When well sinking to stirring stake top, mixing pile is successively abolished by uniform intervals, and synchronize and be uniformly arranged sand pocket, utilized
The sandbox effect of sand pocket carries out off-load and drowns oneself, and realizes open caisson safety, uniformly controlled sinking.
2. a kind of Soft Soil Layer open caisson construction method as described in claim 1, it is characterised in that:
The empty stake of the cement mixing pile point and real stake two parts, from ground to Sinking Well Design bottom above absolute altitude at a certain distance from be empty
Stake, the following are real stakes for empty stake.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201811597631.0A CN109680703A (en) | 2018-12-26 | 2018-12-26 | Soft Soil Layer open caisson construction method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811597631.0A CN109680703A (en) | 2018-12-26 | 2018-12-26 | Soft Soil Layer open caisson construction method |
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| CN201811597631.0A Pending CN109680703A (en) | 2018-12-26 | 2018-12-26 | Soft Soil Layer open caisson construction method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111042171A (en) * | 2019-12-26 | 2020-04-21 | 天津市赛英工程技术咨询有限公司 | Open caisson construction method suitable for silt soft soil foundation and high underground water level |
| CN114319406A (en) * | 2021-12-07 | 2022-04-12 | 上海市基础工程集团有限公司 | Sinking stopping method for open caisson in weak stratum |
| CN115354681A (en) * | 2022-09-19 | 2022-11-18 | 中建三局绿色产业投资有限公司 | Open caisson construction method suitable for house dense area along river basin |
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| CN101781896A (en) * | 2010-03-20 | 2010-07-21 | 浙江裕众建设集团有限公司 | Construction method for manufacturing open caisson on concrete cushion |
| CN102995649A (en) * | 2012-12-04 | 2013-03-27 | 中国一冶集团有限公司 | Method for levelling inclination of open caisson in grading and layer-by-layer manner |
| KR20140058951A (en) * | 2012-11-07 | 2014-05-15 | (주) 선암기술연구소 | Caisson tube water-tight structure and under water structure construction method for soft ground |
| CN105256819A (en) * | 2015-09-29 | 2016-01-20 | 中国一冶集团有限公司 | Improving method for open caisson sinking construction in geology of sludge layer |
| CN106759426A (en) * | 2016-12-30 | 2017-05-31 | 中交第二航务工程局有限公司 | Soft layer well sinking control method and device |
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Patent Citations (5)
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| CN101781896A (en) * | 2010-03-20 | 2010-07-21 | 浙江裕众建设集团有限公司 | Construction method for manufacturing open caisson on concrete cushion |
| KR20140058951A (en) * | 2012-11-07 | 2014-05-15 | (주) 선암기술연구소 | Caisson tube water-tight structure and under water structure construction method for soft ground |
| CN102995649A (en) * | 2012-12-04 | 2013-03-27 | 中国一冶集团有限公司 | Method for levelling inclination of open caisson in grading and layer-by-layer manner |
| CN105256819A (en) * | 2015-09-29 | 2016-01-20 | 中国一冶集团有限公司 | Improving method for open caisson sinking construction in geology of sludge layer |
| CN106759426A (en) * | 2016-12-30 | 2017-05-31 | 中交第二航务工程局有限公司 | Soft layer well sinking control method and device |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111042171A (en) * | 2019-12-26 | 2020-04-21 | 天津市赛英工程技术咨询有限公司 | Open caisson construction method suitable for silt soft soil foundation and high underground water level |
| CN114319406A (en) * | 2021-12-07 | 2022-04-12 | 上海市基础工程集团有限公司 | Sinking stopping method for open caisson in weak stratum |
| CN115354681A (en) * | 2022-09-19 | 2022-11-18 | 中建三局绿色产业投资有限公司 | Open caisson construction method suitable for house dense area along river basin |
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