CN102477737A - Construction Method of Cement Fly Ash Gravel Pile on Collapsible Loess Foundation of Highway - Google Patents
Construction Method of Cement Fly Ash Gravel Pile on Collapsible Loess Foundation of Highway Download PDFInfo
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- CN102477737A CN102477737A CN2010105626668A CN201010562666A CN102477737A CN 102477737 A CN102477737 A CN 102477737A CN 2010105626668 A CN2010105626668 A CN 2010105626668A CN 201010562666 A CN201010562666 A CN 201010562666A CN 102477737 A CN102477737 A CN 102477737A
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- pile
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- 238000010276 construction Methods 0.000 title claims abstract description 30
- 239000004568 cement Substances 0.000 title claims abstract description 16
- 239000010881 fly ash Substances 0.000 title claims abstract description 15
- 238000005553 drilling Methods 0.000 claims abstract description 21
- 239000004567 concrete Substances 0.000 claims abstract description 18
- 239000002131 composite material Substances 0.000 claims abstract description 7
- 239000002689 soil Substances 0.000 claims abstract description 6
- 238000009740 moulding (composite fabrication) Methods 0.000 claims description 9
- 150000001875 compounds Chemical class 0.000 claims description 8
- 239000004575 stone Substances 0.000 claims description 8
- 238000013461 design Methods 0.000 claims description 7
- 235000017166 Bambusa arundinacea Nutrition 0.000 claims description 3
- 235000017491 Bambusa tulda Nutrition 0.000 claims description 3
- 241001330002 Bambuseae Species 0.000 claims description 3
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 3
- 235000015334 Phyllostachys viridis Nutrition 0.000 claims description 3
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 3
- 239000011425 bamboo Substances 0.000 claims description 3
- 238000007689 inspection Methods 0.000 claims description 3
- 239000004571 lime Substances 0.000 claims description 3
- 238000000465 moulding Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 4
- 239000000203 mixture Substances 0.000 abstract 2
- 238000003780 insertion Methods 0.000 abstract 1
- 230000037431 insertion Effects 0.000 abstract 1
- 230000010412 perfusion Effects 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 238000010923 batch production Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- -1 silt Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000011179 visual inspection Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Piles And Underground Anchors (AREA)
Abstract
The invention relates to a construction method of a cement fly ash gravel pile on a collapsible loess foundation of a road, which comprises the following steps: the shaft line control pile and CFG pile position are released according to a pile bitmap; secondly, placing a drill rod in place by using the drilling machine, adjusting the verticality of the drill rod, ensuring that the deviation of the verticality of the drill rod is not more than 1%, drilling by using the drilling machine, and idling and clearing soil after the designed depth is reached; thirdly, drilling and forming all pile positions all the time by adopting a mode of piling at intervals; fourthly, after all CFG pile positions are drilled to the designed elevation, directly sliding the cement fly ash gravel mixture into the hole by a concrete tank truck through a string cylinder, and then vibrating by using an insertion type concrete vibrating rod; and inspecting and accepting the cement fly ash and gravel mixture and the composite pile after the vibrating is finished. The method can obviously reduce the construction cost, shorten the construction time, improve the construction efficiency, needs less construction machinery in unit construction time, and is a construction method of the cement fly ash gravel pile on the collapsible loess foundation of the highway with high pile forming efficiency.
Description
Technical field
The present invention relates to the pile foundation construction field, CFG job practices on especially a kind of highway collapsible loess foundation.
Background technology
The English name of CFG is Cement Fly-ash Gravel, and it is abbreviated as CFG, means CFG, adds water by rubble, aggregate chips, sand, flyash mixed cement and mixes and stirs, the variable intensity stake of processing with various pile machineries.Through adjustment cement mixing content and proportioning, its strength grade changes between C5-C25, is a kind of type between rigid pile and flexible pile.CFG stake and inter-pile soil form CFG pile composite foundation co-operation through mattress layer, so can carry out engineering design according to composite foundation proterties and calculating together.The scope of application of CFG stake is very wide, is widely used in grounds such as sand, silt, clay, mucky soil, miscellaneous fill, collapsible loess, and the CFG stake all is suitable for single footing, strip foundation, raft foundation, and is widely used in the highway soft foundation; At present the general job practices of CFG stake is following: a pile foundation is holed and pump pressure in pipe compound perfusion pile, and vibration sinking tube perfusion pile is then holed to next pile foundation and is poured into to the last a pile foundation and accomplish; This kind form of construction work equipment power consumption is big, and required distribution line is longer, sets transformer at the construction field (site); The power supply expense is bigger, and at building-site agitator is set, and the configuration concrete transfer pump; The concrete consumption is little, and the equipment amortization charge is big, and is long in time limit; It is more that holding time is built in distribution and station, and the construction daily output is little, also need accomplish the telephone-moving of concrete pouring ability behind the pile mechanical piling; In case concrete or delivery pump have problem, pile machinery also need stop, and pile efficient is low.
Summary of the invention
The objective of the invention is to overcome the deficiency of prior art; CFG job practices on a kind of highway collapsible loess foundation is provided; This method can significantly reduce construction cost, shortens the engineering time, improves efficiency of construction; Unit in the engineering time required construction machinery few, pile efficient is high.
The present invention solves its technical problem and realizes through following technical scheme:
CFG job practices on a kind of highway collapsible loess foundation, the step of its job practices is:
⑴. emit axial line control stake and CFG stake position according to piling foundation plan, represent stake position, the high 0.5m of construction stake top mark height ratio design elevation with bamboo pricker under lime point or the nail;
⑵. the long-spiral drilling machine drilling rod of transferring in place, make drill bit stake site, adjustment drilling rod verticality guarantees that the deviation of drilling rod verticality is not more than 1%, starts rig boring then, reaches the clear soil of idle running after the projected depth;
⑶. repeating step ⑵ adopts the mode of piling at interval always with the boring moulding of all piles position;
⑷. all CFG stake position pore-formings begin the cement, flyash and crushed stone compound is sent into the hole with tumbling barrel by direct slide of concrete tank car after design elevation, vibrate with plug-in type concrete vibrating head then;
⑸. vibrating finishes the back to cement, flyash and crushed stone compound and composite pile inspection and acceptance.
And described long-spiral drilling machine rig when construction promotes speed controlling at 2～3m/min.
And described long-spiral drilling machine is a diesel hammer immersed tube pile driver.
Advantage of the present invention and beneficial effect are:
1, the CFG job practices is first with all piles position pore-forming on this highway collapsible loess foundation; Then the stake of all pore-formings is being poured into cement, flyash and crushed stone; This kind method pile, concrete are built mechanical separation; Be convenient to bring into play the professed machine intrinsic advantage, pile, concrete are built intensive separately batch process, and efficient improves.
2, the CFG job practices is not owing to need use concrete transfer pump on this highway collapsible loess foundation, and it is about 50% that total electricity consumption reduces, and both reduced energy consumption, makes field work more convenient again, and overall construction cost reduces.
3, therefore CFG job practices stake hole quality can avoid necking down, the irregular phenomenon in stake hole to take place through visual inspection on this highway collapsible loess foundation, guaranteed to pile quality.
4, the slide of CFG job practices tank car is sent on this highway collapsible loess foundation, and machinery vibrates, and can accurately control a top mark height, can not produce laitance, therefore can practice thrift concrete amount.
5, the present invention can significantly reduce construction cost, shortens the engineering time, improves efficiency of construction, unit in the engineering time required construction machinery few, be CFG job practices on the high highway collapsible loess foundation of a kind of pile efficient.
The specific embodiment
Through specific embodiment the present invention is made further detailed description below, following examples are descriptive, are not determinate, can not limit protection scope of the present invention with this.
CFG job practices on a kind of highway collapsible loess foundation, the step of its job practices is:
⑴. emit axial line control stake and CFG stake position according to piling foundation plan, represent stake position, the high 0.5m of construction stake top mark height ratio design elevation with bamboo pricker under lime point or the nail;
⑵. the diesel hammer immersed tube pile driver drilling rod of transferring in place makes drill bit stake site, adjustment drilling rod verticality; The deviation of guaranteeing the drilling rod verticality is not more than 1%, starts rig boring then, should be slow earlier back fast during pore-forming; Can avoid drilling rod to rock like this; Also can in time check and correct the difference of drilling rod off normal, reach the clear soil of idle running after the projected depth, rig promotes speed controlling at 2～3m/min when construction;
⑶. repeating step ⑵ adopts the mode of piling at interval always with the boring moulding of all piles position;
⑷. all CFG stake position pore-formings begin the cement, flyash and crushed stone compound is sent into the hole with tumbling barrel by direct slide of concrete tank car after design elevation, vibrate with plug-in type concrete vibrating head then;
⑸. vibrating finishes the back to cement, flyash and crushed stone compound and composite pile inspection and acceptance.
Select diesel hammer immersed tube pile driver, as long as distribution satisfies the hydraulic machinery running gear, general power load is no more than 30KW, adopts the method for piling pore-forming at interval, can concentrate pore-forming in batches.In work progress, also can pour into a mould a row or the stake that arrange pore-forming, by the direct hand-hole of concrete tank car, in addition plug-in type concrete vibrating head vibrates with tumbling barrel more, vibrates to finish afterwards to the examination of testing of cement, flyash and crushed stone compound and composite pile.
After pile construction finished, the construction of next pile was carried out in the rig displacement in addition.Native more owing to what discharge during construction, the stake position that often will close on covers, and also can be moved because of the rig feet is pressed in the other stake position of former demarcation that make, a position sometimes.During therefore to next pile construction, also should check the stake position of need construction, guarantee the stake position accurately according to the position of axis or stake on every side.
Claims (3)
1. CFG job practices on the highway collapsible loess foundation, it is characterized in that: the step of this job practices is:
⑴. emit axial line control stake and CFG stake position according to piling foundation plan, represent stake position, the high 0.5m of construction stake top mark height ratio design elevation with bamboo pricker under lime point or the nail;
⑵. the long-spiral drilling machine drilling rod of transferring in place, make drill bit stake site, adjustment drilling rod verticality guarantees that the deviation of drilling rod verticality is not more than 1%, starts rig boring then, reaches the clear soil of idle running after the projected depth;
⑶. repeating step ⑵ adopts the mode of piling at interval always with the boring moulding of all piles position;
⑷. all CFG stake position pore-formings begin the cement, flyash and crushed stone compound is sent into the hole with tumbling barrel by direct slide of concrete tank car after design elevation, vibrate with plug-in type concrete vibrating head then;
⑸. vibrating finishes the back to cement, flyash and crushed stone compound and composite pile inspection and acceptance.
2. CFG job practices on the highway collapsible loess foundation according to claim 1 is characterized in that: described long-spiral drilling machine rig when construction promotes speed controlling at 2～3m/min.
3. CFG job practices on the highway collapsible loess foundation according to claim 1 is characterized in that: described long-spiral drilling machine is a diesel hammer immersed tube pile driver.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105626668A CN102477737A (en) | 2010-11-29 | 2010-11-29 | Construction Method of Cement Fly Ash Gravel Pile on Collapsible Loess Foundation of Highway |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105626668A CN102477737A (en) | 2010-11-29 | 2010-11-29 | Construction Method of Cement Fly Ash Gravel Pile on Collapsible Loess Foundation of Highway |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102477737A true CN102477737A (en) | 2012-05-30 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010105626668A Pending CN102477737A (en) | 2010-11-29 | 2010-11-29 | Construction Method of Cement Fly Ash Gravel Pile on Collapsible Loess Foundation of Highway |
Country Status (1)
| Country | Link |
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| CN (1) | CN102477737A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103590391A (en) * | 2013-11-27 | 2014-02-19 | 温州宏源水电建设有限公司 | Cement-fly-ash-gravel pile foundation reinforcing construction method |
| CN112281820A (en) * | 2020-10-19 | 2021-01-29 | 中铁六局集团有限公司 | Cement fly ash gravel pile construction method |
| CN112458809A (en) * | 2020-10-19 | 2021-03-09 | 中交一公局集团有限公司 | Treatment method for collapsible loess subgrade |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001036753A1 (en) * | 1999-11-18 | 2001-05-25 | Cementation Foundations Skanska Limited | Pile forming |
| CN1370893A (en) * | 2002-04-04 | 2002-09-25 | 中国建筑科学研究院 | Pile end mortar pre-pressing construction method and apparatus for long screw auger drilling deposited pile and CFG pile |
| CN1740457A (en) * | 2005-09-15 | 2006-03-01 | 贵阳铝镁设计研究院 | Vibration process of eliminating wet foundation falling for CFG pile |
| CN101440622A (en) * | 2008-12-17 | 2009-05-27 | 何志红 | CFG pile, pipe pile embankment reinforcement system and construction method thereof |
| CN101761073A (en) * | 2010-01-19 | 2010-06-30 | 广东省长大公路工程有限公司 | Improved construction technology of CFG (cement fIying-ash gravel) pile |
-
2010
- 2010-11-29 CN CN2010105626668A patent/CN102477737A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001036753A1 (en) * | 1999-11-18 | 2001-05-25 | Cementation Foundations Skanska Limited | Pile forming |
| CN1370893A (en) * | 2002-04-04 | 2002-09-25 | 中国建筑科学研究院 | Pile end mortar pre-pressing construction method and apparatus for long screw auger drilling deposited pile and CFG pile |
| CN1740457A (en) * | 2005-09-15 | 2006-03-01 | 贵阳铝镁设计研究院 | Vibration process of eliminating wet foundation falling for CFG pile |
| CN101440622A (en) * | 2008-12-17 | 2009-05-27 | 何志红 | CFG pile, pipe pile embankment reinforcement system and construction method thereof |
| CN101761073A (en) * | 2010-01-19 | 2010-06-30 | 广东省长大公路工程有限公司 | Improved construction technology of CFG (cement fIying-ash gravel) pile |
Non-Patent Citations (3)
| Title |
|---|
| 周续业等: "CFG桩的基本原理及其在公路软基处理上的应用", 《西部探矿工程》, no. 3, 31 March 2003 (2003-03-31), pages 151 - 153 * |
| 田玉春等: "水泥-粉煤灰-碎石桩复合地基分析", 《粉煤灰综合利用》, no. 3, 30 June 2002 (2002-06-30), pages 8 - 10 * |
| 范弘等: "浅谈CFG 桩复合地基的应用", 《山西建筑》, no. 10, 31 October 2002 (2002-10-31), pages 25 - 26 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103590391A (en) * | 2013-11-27 | 2014-02-19 | 温州宏源水电建设有限公司 | Cement-fly-ash-gravel pile foundation reinforcing construction method |
| CN103590391B (en) * | 2013-11-27 | 2016-05-25 | 温州宏源水电建设有限公司 | A kind of CFG foundation stabilization construction method |
| CN112281820A (en) * | 2020-10-19 | 2021-01-29 | 中铁六局集团有限公司 | Cement fly ash gravel pile construction method |
| CN112458809A (en) * | 2020-10-19 | 2021-03-09 | 中交一公局集团有限公司 | Treatment method for collapsible loess subgrade |
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Application publication date: 20120530 |