CN101736730A - Mixed reinforcement method of high-fill sand foundation - Google Patents
Mixed reinforcement method of high-fill sand foundation Download PDFInfo
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- CN101736730A CN101736730A CN200810305374A CN200810305374A CN101736730A CN 101736730 A CN101736730 A CN 101736730A CN 200810305374 A CN200810305374 A CN 200810305374A CN 200810305374 A CN200810305374 A CN 200810305374A CN 101736730 A CN101736730 A CN 101736730A
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- jet grouting
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Abstract
The invention discloses a mixed reinforcement method of high-fill sand foundation, comprising the following steps: 1. adopting a pounder free-falling body to punch for forming a pore, adding filler into the pore by layers for tamping to form a tamping compacted zone; 2. arranging a high-pressure jet grouting pile in a non-compacted zone to form a rigid cement pile body. The pole distribution space of punching pore forming is as follows: a=3.5-4.5 m; the length of the jet grouting pile is 1/2-2/3 of foundation reinforcing depth; and the diameter of the jet grouting pile is as follows: d=0.6-0.8 m. The invention can improve the bearing capacity of the sand foundation by replacing forced ramming in pores, ensures the stability of the foundation by the jet grouting pile, has convenient construction and saves investment.
Description
Technical field
The present invention relates to a kind of method of reinforcing high-fill sand foundation.
Background technology
China's " building lot treatment technology standard " provides the multiple reinforcement means that is applicable to sand foundation, wherein the sand of indication is natural formation, water content is higher, silt that bearing capacity is lower or fine sand soil layer, and the purpose of reinforcing generally is to improve the bearing capacity of foundation soil and eliminate liquefaction.For the darker high fill foundation of sand backfill, because the water content of backfill sand is little, also looser, the sand-gravel pile of recommending in the general code requirement, lime-soil compaction pile, high-pressure slip-casting and the dynamic compaction reinforced processing of displacement, but the effect that adopts independent a kind of method to handle is all relatively poor, reason is that the water content of backfill sand is low, because its internal friction is big, influenced the compacted effect of soil, and the soil body scope that above-mentioned first three methods can be compacted is very little, so the cloth pitch of holes is also very little, be generally 1m～1.5m, therefore the closeer quantity in cloth hole is many, and construction quality is difficult for guaranteeing that the ground stabilization expense is also higher.If adopt the 4th kind of method to handle separately, then bearing capacity of foundation soil can meet the demands, but the stability of ground can not meet the demands.
Summary of the invention
The technical problem to be solved in the present invention is: a kind of mixed reinforcement method of high-fill sand foundation is provided, this method can improve the bearing capacity of sand foundation, and construction quality that prior art exists is difficult for guaranteeing or the ground stabilization expense is higher, the deficiency of foundation stability difference to overcome.
Basic technical scheme of the present invention is: adopt strong rammer of displacement and high-pressure rotary jet grouting pile reinforcing fill sand foundation in the hole.
Adopt the strong rammer of displacement in the hole, compacted looser sand, form more closely knit compacted district in the hole peripheral extent, because the sand internal friction is bigger, make the compacted effect of soil be obstructed and can outside compacted district, form non-compacted district, this regional sand density is poor, lateral deformation constraint to the compacted district soil body is little, under the outer load effect, lateral deformation can take place in the soil body in compacted district, produces foundation instability and destroys.Therefore in non-encrypted area, adopt high-pressure rotary jet grouting pile, the construction of rotary churning pile has compacted effect to this regional soil body, the more important thing is that the formed concrete stake of rotary churning pile belongs to rigid pile, pile body can play the effect of restriction soil lateral, has prevented the lateral deformation unstability of sand.
The present invention compared with prior art, the present invention guarantees the stability of ground by the strong bearing capacity that rams the raising sand foundation of displacement in the hole by rotary churning pile; Investment is saved in easy construction.
Description of drawings
Fig. 1 is a schematic diagram of the present invention;
Fig. 2 is the A Abandon sectional view among Fig. 1.
The specific embodiment
Embodiments of the invention: it comprises following process:
The first, adopt hammer ram freely falling body impact holing, the filled compacting of layering in the hole forms the closely knit compacted district of compacting; The second, arrange high-pressure rotary jet grouting pile in non-compacted district, form rigidity cement pile body.
The cloth pitch of holes a=3.5m～4.5m of impact holing;
The length H1 of rotary churning pile is the ground stabilization degree of depth (1/2～2/3), i.e. H1=(1/2～2/3) H;
Diameter d=the 0.6m of rotary churning pile～0.8m.
Characteristics of the present invention:
1) owing in the process of impact holing and backfill compacting, periphery soil is had stronger compacted effect, so the foundation bearing capacity after reinforcing is higher, formed compacted district scope is bigger, and the spacing α that therefore impacts the cloth hole is also bigger, is generally 3.5m～4.5m.
2) filler can be gathered materials on the spot in the hole, and plain soil, sand, sandstone and building waste all are good filler, and be cheap, saves investment, and the building waste of particularly may dissolving has good protective effect to environment;
3) quantity of rotary churning pile is few, easy construction, and the pile length H of rotary churning pile1Can be littler than calculating required ground processing depth H, saved investment.
Claims (4)
1. mixed reinforcement method of high-fill sand foundation, it is characterized in that: it comprises following process: the first, adopt hammer ram freely falling body impact holing, the filled compacting of layering in the hole forms the closely knit compacted district of compacting; The second, arrange high-pressure rotary jet grouting pile in non-compacted district, form rigidity cement pile body.
2. mixed reinforcement method of high-fill sand foundation according to claim 1 is characterized in that: the cloth pitch of holes a=3.5m～4.5m of impact holing.
3. mixed reinforcement method of high-fill sand foundation according to claim 1 is characterized in that: the length H1 of rotary churning pile is 1/2～2/3 of a ground stabilization depth H.
4. mixed reinforcement method of high-fill sand foundation according to claim 1 is characterized in that: the diameter d=0.6m of rotary churning pile～0.8m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810305374A CN101736730A (en) | 2008-11-04 | 2008-11-04 | Mixed reinforcement method of high-fill sand foundation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810305374A CN101736730A (en) | 2008-11-04 | 2008-11-04 | Mixed reinforcement method of high-fill sand foundation |
Publications (1)
| Publication Number | Publication Date |
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| CN101736730A true CN101736730A (en) | 2010-06-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN200810305374A Pending CN101736730A (en) | 2008-11-04 | 2008-11-04 | Mixed reinforcement method of high-fill sand foundation |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102561364A (en) * | 2012-01-20 | 2012-07-11 | 山西机械化建设集团公司 | 'Three-step three-layer method' landfill filling construction process of dimension stone high-fill dynamic compaction treatment foundation |
| CN103758109A (en) * | 2014-01-13 | 2014-04-30 | 东南大学 | Arrangement and processing method for long firm and oil solidated water draining chemical churning pile foundation |
| CN104929009A (en) * | 2015-06-04 | 2015-09-23 | 苏州金螳螂园林绿化景观有限公司 | Method for preventing ground of square from subsiding |
| CN105155505A (en) * | 2015-08-21 | 2015-12-16 | 四川九鼎智远知识产权运营有限公司 | Construction method for rigid pile composite foundation |
| CN112030932A (en) * | 2020-09-14 | 2020-12-04 | 大地巨人(北京)工程科技有限公司 | Dynamic compaction pile composite foundation treatment method |
-
2008
- 2008-11-04 CN CN200810305374A patent/CN101736730A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102561364A (en) * | 2012-01-20 | 2012-07-11 | 山西机械化建设集团公司 | 'Three-step three-layer method' landfill filling construction process of dimension stone high-fill dynamic compaction treatment foundation |
| CN102561364B (en) * | 2012-01-20 | 2014-05-07 | 山西机械化建设集团公司 | 'Three-step three-layer method' landfill filling construction process of dimension stone high-fill dynamic compaction treatment foundation |
| CN103758109A (en) * | 2014-01-13 | 2014-04-30 | 东南大学 | Arrangement and processing method for long firm and oil solidated water draining chemical churning pile foundation |
| CN103758109B (en) * | 2014-01-13 | 2015-08-26 | 东南大学 | For setting and the processing method of the draining rotary churning pile ground of underconsolidated soil |
| CN104929009A (en) * | 2015-06-04 | 2015-09-23 | 苏州金螳螂园林绿化景观有限公司 | Method for preventing ground of square from subsiding |
| CN104929009B (en) * | 2015-06-04 | 2017-05-10 | 苏州金螳螂园林绿化景观有限公司 | Method for preventing ground of square from subsiding |
| CN105155505A (en) * | 2015-08-21 | 2015-12-16 | 四川九鼎智远知识产权运营有限公司 | Construction method for rigid pile composite foundation |
| CN112030932A (en) * | 2020-09-14 | 2020-12-04 | 大地巨人(北京)工程科技有限公司 | Dynamic compaction pile composite foundation treatment method |
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Application publication date: 20100616 |