CN103790173B - The device and method of lime-soil compaction pile and CFG rigid pile Combined Treatment collapsible loess - Google Patents
The device and method of lime-soil compaction pile and CFG rigid pile Combined Treatment collapsible loess Download PDFInfo
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- CN103790173B CN103790173B CN201410090891.4A CN201410090891A CN103790173B CN 103790173 B CN103790173 B CN 103790173B CN 201410090891 A CN201410090891 A CN 201410090891A CN 103790173 B CN103790173 B CN 103790173B
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Abstract
The invention discloses the device and method of a kind of lime-soil compaction pile and CFG rigid pile Combined Treatment collapsible loess, comprise the multiple lime-soil compaction piles be located in pending collapsible loess region, the pile body Inner of lime-soil compaction pile is provided with CFG rigid pile, and the stake footpath of lime-soil compaction pile is greater than the stake footpath of CFG rigid pile.First, pretreatment is carried out to pending collapsible loess region ground; Then press design attitude and arrange lime-soil compaction pile stake position, adopt pipeline sinking pile machine pore-forming to projected depth, in hole, fill out dirt filler, ram into lime-soil compaction pile with post hammer layering punching; Holed to the projected depth of CFG rigid pile by long-spiral drilling machine in the pile body of described lime-soil compaction pile afterwards, in hole, concrete perfusion becomes CFG rigid pile.Collapsible loess foundation Disposal quality can be significantly improved, ensure engineering safety, significantly reduce construction investment, reasonable in design, structure is simple, safe and reliable, strong adaptability.
Description
Technical field
The present invention relates to a kind of consolidation process technology of ground, particularly relate to the device and method of a kind of lime-soil compaction pile and CFG rigid pile Combined Treatment collapsible loess.
Background technology
Loess extensively exists in China, particularly the Northwest as the common geology of one.Collapsibility of loess refers under loess certain pressure (comprising native gravity pressure and external pressure) effect, destroy rapidly by structure after water-soaked and the remarkable sinkage occurred, the loess with settlement by soaking is called collapsible loess, and collapsible loess can be divided into self weight collapse loess and non-self centred graph.When collapsible loess foundation is built, the harm because saturated yielding causes additional settlement may cause engineering must be considered, so before carrying out engineering construction, suitable method for processing foundation should be selected, the harm that the saturated yielding eliminating ground causes.
In prior art, darker collapsible loess foundation process generally adopt strong rammer, broken stone pile compacted, ram traditional method for processing foundation such as (punching) expansion stake etc., these methods can significantly Compaction variables, improve loess bearing capacity, stronger compliance is had for large area basement process, but it is not strong for the reinforcement criteria compliance of the high-bearing capacity of regional area, low sedimentation, how in small size region, local, can eliminate collapsibility of loess can provide again high-bearing capacity and the ground that economy is strong is the problem needing in some designs to solve.
Summary of the invention
The object of this invention is to provide a kind of device and method that can significantly improve collapsible loess foundation Disposal quality, ensure engineering safety, the lime-soil compaction pile significantly reducing construction investment and CFG rigid pile Combined Treatment collapsible loess.
Technical scheme of the present invention is achieved through the following technical solutions:
The device of lime-soil compaction pile of the present invention and CFG rigid pile Combined Treatment collapsible loess, comprise the multiple lime-soil compaction piles be located in pending collapsible loess region, the pile body Inner of described lime-soil compaction pile is provided with CFG rigid pile, and the stake footpath of described lime-soil compaction pile is greater than the stake footpath of described CFG rigid pile.
The method of lime-soil compaction pile of the present invention and CFG rigid pile Combined Treatment collapsible loess, comprises step:
A, pretreatment is carried out to pending collapsible loess region ground;
B, arrange lime-soil compaction pile stake position by design attitude, adopt pipeline sinking pile machine pore-forming to projected depth, in hole, fill out dirt filler, ram into lime-soil compaction pile with post hammer layering punching;
C, in the pile body of described lime-soil compaction pile by long-spiral drilling machine boring to the projected depth of CFG rigid pile, in hole, concrete perfusion becomes CFG rigid pile.
As seen from the above technical solution provided by the invention, the device and method of lime-soil compaction pile of the present invention and CFG rigid pile Combined Treatment collapsible loess, dirt and collapsible loess mixing is utilized to produce serial physical chemical reaction, change the particle composition of loess, reduce the index of plasticity of loess, make compaction pile have higher-strength to reduce the settlement by soaking of periphery loess simultaneously, make compaction pile and periphery loess become the soil body of comparatively stable, a basic Compaction variables, the CFG rigid pile for rear implantation provides good stake week, stake base ring border; CFG rigid pile is placed in the compaction pile pile body that become, all without collapsible loess environment at the bottom of all stakes of stake, good stability, CFG uses as minor diameter rigid pile, CFG rigid pile pile body rigidity and bearing capacity can be made full use of, periphery compaction pile can be used as Safety Redundancy providing ground environment at the bottom of without collapsible loess stake week stake simultaneously, can arrange CFG rigid pile position and quantity, and do not limit compaction pile large area basement process by design to requirement for bearing capacity.
From application example, structure of the present invention is simple, reasonable in design, has both given full play to the advantage of traditional Treatment method of collapsible loess foundation, has taken full advantage of again the characteristic of CFG rigid pile as rigid pile high-bearing capacity, light structure, integrated engineering amount is little, construction period is short and wide accommodation.The present invention is reasonable in design, structure is simple, safe and reliable, strong adaptability.
Accompanying drawing explanation
Fig. 1 is the process chart of specific embodiments of the invention;
Fig. 2 is the layout schematic diagram of lime-soil compaction pile in specific embodiments of the invention;
Fig. 3 is lime-soil compaction pile and CFG rigid pile relative position floor map in specific embodiments of the invention;
Fig. 4 is compaction pile and CFG rigid pile relative position elevational schematic view in specific embodiments of the invention;
Fig. 5 is the A-A cross-sectional view of Fig. 4;
Fig. 6 is that in specific embodiments of the invention, schematic diagram arranged by CFG rigid pile pile body upper reinforcement cage.
In figure:
1-lime-soil compaction pile; 2-CFG rigid pile; 3-collapsible loess; 4-reinforcing cage.
Detailed description of the invention
To be described in further detail the embodiment of the present invention below.
The device of lime-soil compaction pile of the present invention and CFG rigid pile Combined Treatment collapsible loess, its preferably detailed description of the invention be:
Comprise the multiple lime-soil compaction piles be located in pending collapsible loess region, the pile body Inner of described lime-soil compaction pile is provided with CFG rigid pile, and the stake footpath of described lime-soil compaction pile is greater than the stake footpath of described CFG rigid pile.
Described lime-soil compaction pile is made up of dirt filler, and described CFG rigid pile is made up of concrete.
The top pile body of described CFG rigid pile is provided with steel mesh reinforcement.
The pile spacing of described lime-soil compaction pile is more than or equal to the stake footpath of the CFG rigid pile of 3 times.
Be the bottom of described collapsible loess at the bottom of the stake of described lime-soil compaction pile, at the bottom of or stake higher than described lime-soil compaction pile concordant with at the bottom of the stake of described compaction pile at the bottom of the stake of described CFG rigid pile, the degree of depth of described collapsible loess is less than or equal to 20 meters.
The stake top of described CFG rigid pile is connected as a whole with the works placed on it of construction in later period by concreting.
The method of lime-soil compaction pile of the present invention and CFG rigid pile Combined Treatment collapsible loess, its preferably detailed description of the invention be:
Comprise step:
A, pretreatment is carried out to pending collapsible loess region ground;
B, arrange lime-soil compaction pile stake position by design attitude, adopt pipeline sinking pile machine pore-forming to projected depth, in hole, fill out dirt filler, ram into lime-soil compaction pile with post hammer layering punching;
C, in the pile body of described lime-soil compaction pile by long-spiral drilling machine boring to the projected depth of CFG rigid pile, in hole, concrete perfusion becomes CFG rigid pile.
Described steps A comprises: cleaning leveling, impact-rolling;
Described step B comprises: arrange that lime-soil compaction pile stake position, pipeline sinking pile facility are in place, boring, boring detects, filler makes, filler in hole, post hammer layering punching is rammed, construction equipment shifts out, lime-soil compaction pile pile detects;
Described step C comprises: long-spiral drilling machine is in place, boring, concrete for making, concrete perfusion, fill orifice base concrete in drilling rod, become and send that drilling rod limit castinplace pile is carried on pump limit, pile, long-spiral drilling machine shift out, CFG rigid pile pile detects.
Collapsible loess foundation bearing capacity after described impact-rolling process is 100 ~ 120kpa.
Containing the cement being no more than 8% in described dirt filler, described compaction pile bearing capacity is less than or equal to 300kpa.
Specific embodiment:
As shown in Fig. 1 ~ Fig. 6:
Comprise the steps: step one, to pending collapsible loess 1 region ground cleaning leveling and impact-rolling; Step 2, arranges lime-soil compaction pile 2 positions by design attitude, adopts pipeline sinking pile machine pore-forming to projected depth, filler in hole, and compaction pile is rammed in post hammer layering punching; Step 3, compaction pile 2 arranges long-spiral drilling machine, in the internal drilling of compaction pile pile body to CFG rigid pile 3 projected depth, pours into compound and become CFG rigid pile 3 after pore-forming.
Step one comprises the sub-steps such as cleaning leveling, impact-rolling pretreatment; Step 2 comprise arrange that compaction pile stake position, compaction pile facility are in place, the sub-step such as boring, boring detect, filler makes and filler in hole, post hammer layering punching are rammed, construction equipment shifts out, the detection of compaction pile pile; Step 3 comprises that long-spiral drilling machine is in place, boring, concrete for making, concrete perfusion, fill orifice base concrete in drilling rod, become sub-steps such as sending drilling rod limit castinplace pile is carried on pump limit, pile, long-spiral drilling machine shift out, the detection of CFG rigid pile pile.
Lime-soil compaction pile pile spacing controls by CFG rigid pile design pitch, designs stake footpath (0.4m) 1.2m consider design by the CFG being greater than 3 times; Lime-soil compaction pile design pile stake footpath 0.65m, is greater than the CFG rigid pile footpath 0.4m of pile; Be bottom collapsible loess at the bottom of lime-soil compaction pile stake, the degree of depth is 15m.
Compaction pile filler match ratio and the punching of post hammer are rammed data and are determined according to test, and in filler, P.042.5 cement adopt, and content is about 6%, and after pile, compaction pile bearing capacity is 250kpa.
The CFG rigid pile that later stage is formed is planted in the compaction pile pile body formed in advance.CFG rigid pile uses as the design of rigidity Small Diameter Pile, and CFG rigid pile stake top is connected as a whole with its basis that is placed in of construction in later period by concreting.CFG rigid pile compound is C20 concrete, and CFG rigid pile top pile body installs reinforcing cage.According to requirement for bearing capacity, the long 12m of design CFG rigid pile stake.
Apply lime-soil compaction pile of the present invention and CFG rigid pile Combined Treatment collapsible loess method, collapsible loess foundation Disposal quality can be significantly improved, ensure engineering safety, significantly reduce construction investment, thus the economy that develops skill, its design principle is:
First Lime-Soil Compaction Piles inter-pile soil is utilized, lime and collapsible loess mixing is utilized to produce serial physical chemical reaction, change the particle composition of loess, reduce the index of plasticity of loess, make compaction pile have higher-strength to reduce the settlement by soaking of periphery loess simultaneously, make compaction pile and periphery loess become the soil body of comparatively stable, a basic Compaction variables, the CFG rigid pile for rear implantation provides good stake week, stake base ring border.CFG rigid pile is placed in the compaction pile pile body that become, all without collapsible loess environment at the bottom of all stakes of stake, good stability, CFG uses as minor diameter rigid pile, CFG rigid pile pile body rigidity and bearing capacity can be made full use of, periphery compaction pile can be used as Safety Redundancy providing ground environment at the bottom of without collapsible loess stake week stake simultaneously, can arrange CFG rigid pile position and quantity, and do not limit compaction pile large area basement process by design to requirement for bearing capacity.
In instantiation, under making sheet pedestal, ground is collapsible loess, bearing capacity 85kPa, first elevation location at the bottom of excavation to making sheet pedestal, then cleaning leveling and impact-rolling are carried out to former foundation soil, guarantee that the collapsible loess foundation bearing capacity after processing is not less than 100kpa.Then diameter 650mm lime-soil compaction pile is adopted to process collapsible loess, pile spacing is 1.2m, stake is long to be determined according to actual collapsible loess thickness, and be not less than 15m, stake end need through yellow soil horizon of collapsibility, after basement process, bearing capacity is not less than 300kpa, arranges 2 row lime-soil compaction piles outside counter force wall.400mmCFG rigid pile is set in the lime-soil compaction pile then in basic scope, pile crown stretches into making sheet pedestal basis and is not less than 50mm, CFG rigid pile is long is not less than 12m, 10 Φ 16 reinforcing bars are inserted in pile crown position, insertion depth is not less than 7m, and under basement process meets two kinds of operating modes, making sheet pedestal is to the bearing capacity of ground and settlement request.Making sheet pedestal grade slab is plain concrete construction, and thickness is 300mm, and planar dimension is 75m × 7.2m.Twice counter force wall is arranged in grade slab both sides, and counter force wall is reinforced concrete structure, only arranges a row CFG rigid pile foundation under counter force wall.
The above; be only the present invention's preferably detailed description of the invention, but protection scope of the present invention is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; the change that can expect easily or replacement, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of claims.
Claims (10)
1. a method for lime-soil compaction pile and CFG rigid pile Combined Treatment collapsible loess, is characterized in that, comprise step:
A, pretreatment is carried out to pending collapsible loess region ground;
B, arrange lime-soil compaction pile stake position by design attitude, adopt pipeline sinking pile machine pore-forming to projected depth, in hole, fill out dirt filler, ram into lime-soil compaction pile with post hammer layering punching;
C, in the pile body of described lime-soil compaction pile by long-spiral drilling machine boring to the projected depth of CFG rigid pile, in hole, concrete perfusion becomes CFG rigid pile.
2. the method for lime-soil compaction pile according to claim 1 and CFG rigid pile Combined Treatment collapsible loess, is characterized in that:
Described steps A comprises: cleaning leveling, impact-rolling;
Described step B comprises: arrange that lime-soil compaction pile stake position, pipeline sinking pile facility are in place, boring, boring detects, filler makes, filler in hole, post hammer layering punching is rammed, construction equipment shifts out, lime-soil compaction pile pile detects;
Described step C comprises: long-spiral drilling machine is in place, boring, concrete for making, concrete perfusion, fill orifice base concrete in drilling rod, become and send that drilling rod limit castinplace pile is carried on pump limit, pile, long-spiral drilling machine shift out, CFG rigid pile pile detects.
3. the method for lime-soil compaction pile according to claim 2 and CFG rigid pile Combined Treatment collapsible loess, is characterized in that, the collapsible loess foundation bearing capacity after described impact-rolling process is 100 ~ 120kpa.
4. the method for lime-soil compaction pile according to claim 3 and CFG rigid pile Combined Treatment collapsible loess, is characterized in that, containing the cement being no more than 8% in described dirt filler, described compaction pile bearing capacity is less than or equal to 300kpa.
5. one kind realizes the device of the method for lime-soil compaction pile described in any one of Claims 1-4 and CFG rigid pile Combined Treatment collapsible loess, it is characterized in that, comprise the multiple lime-soil compaction piles be located in pending collapsible loess region, the pile body Inner of described lime-soil compaction pile is provided with CFG rigid pile, and the stake footpath of described lime-soil compaction pile is greater than the stake footpath of described CFG rigid pile.
6. the device realizing the method for lime-soil compaction pile and CFG rigid pile Combined Treatment collapsible loess according to claim 5, it is characterized in that, described lime-soil compaction pile is made up of dirt filler, and described CFG rigid pile is made up of concrete.
7. the device realizing the method for lime-soil compaction pile and CFG rigid pile Combined Treatment collapsible loess according to claim 6, it is characterized in that, the top pile body of described CFG rigid pile is provided with steel mesh reinforcement.
8. the device realizing the method for lime-soil compaction pile and CFG rigid pile Combined Treatment collapsible loess according to claim 7, is characterized in that, the pile spacing of described lime-soil compaction pile is more than or equal to the stake footpath of the CFG rigid pile of 3 times.
9. the device realizing the method for lime-soil compaction pile and CFG rigid pile Combined Treatment collapsible loess according to claim 8, it is characterized in that, it is the bottom of described collapsible loess at the bottom of the stake of described lime-soil compaction pile, at the bottom of or stake higher than described lime-soil compaction pile concordant with at the bottom of the stake of described compaction pile at the bottom of the stake of described CFG rigid pile, the degree of depth of described collapsible loess is less than or equal to 20 meters.
10. the device realizing the method for lime-soil compaction pile and CFG rigid pile Combined Treatment collapsible loess according to claim 9, it is characterized in that, the stake top of described CFG rigid pile is connected as a whole with the works placed on it of construction in later period by concreting.
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| CN201410090891.4A CN103790173B (en) | 2014-03-12 | 2014-03-12 | The device and method of lime-soil compaction pile and CFG rigid pile Combined Treatment collapsible loess |
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| CN201410090891.4A CN103790173B (en) | 2014-03-12 | 2014-03-12 | The device and method of lime-soil compaction pile and CFG rigid pile Combined Treatment collapsible loess |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107558506A (en) * | 2017-08-20 | 2018-01-09 | 兰州大学 | A kind of new concrete anti-corrosion foundation pile and its construction technology |
| CN109610443A (en) * | 2018-12-29 | 2019-04-12 | 周同和 | A kind of construction method for collapsibility soil body stake |
| CN113373952A (en) * | 2021-06-08 | 2021-09-10 | 辽宁工程技术大学 | A connection structure for collapsible loess side slope support |
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| CN102162246A (en) * | 2011-05-18 | 2011-08-24 | 中铁西北科学研究院有限公司 | Vibration-less compaction method of collapsible loess foundation |
| CN102733380A (en) * | 2012-06-17 | 2012-10-17 | 张永忠 | Lag pile and construction method thereof |
| CN203755332U (en) * | 2014-03-12 | 2014-08-06 | 中铁第五勘察设计院集团有限公司 | Device for treating collapsible loess with lime-soil compaction piles and CFG rigid piles combined |
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2014
- 2014-03-12 CN CN201410090891.4A patent/CN103790173B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1077642A (en) * | 1996-09-02 | 1998-03-24 | Asahi Chem Ind Co Ltd | Foundation structure of building and construction method therefor and excavating machine for soil improvement |
| CN2553008Y (en) * | 2002-05-10 | 2003-05-28 | 贾燎 | Combined pile |
| CN101603282A (en) * | 2009-06-29 | 2009-12-16 | 中铁二院工程集团有限责任公司 | High speed railway collapsible loess tunnel foundation base configuration |
| CN102162246A (en) * | 2011-05-18 | 2011-08-24 | 中铁西北科学研究院有限公司 | Vibration-less compaction method of collapsible loess foundation |
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| CN203755332U (en) * | 2014-03-12 | 2014-08-06 | 中铁第五勘察设计院集团有限公司 | Device for treating collapsible loess with lime-soil compaction piles and CFG rigid piles combined |
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