CN1482305A - A deep level jet agitation pile forming method - Google Patents
A deep level jet agitation pile forming method Download PDFInfo
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- CN1482305A CN1482305A CNA021306389A CN02130638A CN1482305A CN 1482305 A CN1482305 A CN 1482305A CN A021306389 A CNA021306389 A CN A021306389A CN 02130638 A CN02130638 A CN 02130638A CN 1482305 A CN1482305 A CN 1482305A
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- cement
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Abstract
The invention relates to a deep level jet agitation pile forming method comprising, combining the mechanical agitation with the jet agitation, applying agitation treatment on the center position of the pile, applying high-pressure injection on the periphery of the pile for processing the ground foundation by slip casting, thus forming uniform concrete pile. The invention can be applied to various soil layers and engineering projects, it can overcome the drawbacks resulted from the mere application of deep layer agitation or high-pressure injection slip casting.
Description
Technical field
The present invention relates to a kind of deep level jet agitation pile forming method, refer in particular to the novel construction method that a kind of ground stabilization that is applied in the geotechnical engineering is handled.
Background technology
Two kinds of piling methods of high pressure jet grouting (high-pressure rotary-spray) method and deep mixing method are two kinds of cement earth pile construction technology methods of present domestic extensive use, also are job practicess commonly used during ground stabilization is handled.High-pressure rotary spraying method is that the drilling rod that will have nozzle bores absolute altitude predetermined in (beating) underground layer, (pressure can reach 20～40MPa) jet cement slurries with high pressure then, form injection stream impact failure soil layer, soil particle in the jet impulse lower part with slurries or the water ground of emerging, part mixes with the slurries that spray under jet action, forms the cement-soil induration.Deep mixing method is to use the drilling rod rotary drilling underground layer that has special agitator to predetermined absolute altitude, and when promoting drilling rod, water spray mud (powder) limit, limit forces to stir to the soil body, thereby forms cement earth pile then.Deep mixing method exists soil layer bad adaptability, pile quality instability in application,, defective such as body intensity is low, rigidity is little and the Bearing Capacity of Composite Foundation increase rate is little; Jet grounting exists then in application that required ablation energy is big, big to equipment requirement height, loss, cement grout emit gush serious and in sand during construction periphery sand cave in and cause drilling rod can't promote defectives such as rotation construction.
Summary of the invention
The objective of the invention is, on the basis of deep mixing method and jet grounting, develop out a kind of novel ground stabilization treatment technology method, it combines mechanical agitation and injection stirring, can bring into play effectively that deep mixing method and high pressure jet grouting have separately strong point, and overcome the defective that they exist separately effectively.
The objective of the invention is to realize: a kind of deep level jet agitation pile forming method by following technological means, comprise down bore, the limit jet grouting stirs the limit and carries brill, recharges operation such as slurries, it is characterized in that: to adopt mechanical mixing method, to adopt high-pressure injection method is auxilliary then in the periphery of pile body in the centre of pile.
Cement paste expulsion pressure in described a kind of deep level jet agitation pile forming method is generally 3～20MPa; The drilling rod hoisting velocity is generally 20～200mm, and subsidence velocity is 20～200cm/min.The material spray that described a kind of deep level jet agitation pile forming method uses is except that cement paste, also can adopt cement mortar or cement-flying ash mortar, and can be according to the needs of construction works, can mix the special material that some are played a role in cement mortar and cement, flyash slurries, as materials such as rapid hardening, diminishing, slow setting dosage.
The invention has the advantages that:
1, the present invention compares with existing deep layer stirring "forming column, and its compliance to soil layer is strong, both applicable to the weak soil of natural foundation bearing capacity standard value less than 120kPa, again applicable to the pan soil of natural foundation bearing capacity standard value greater than 120kPa; Strength of the mixing pile height behind the pile, unconfined compression strength can reach 3～20MPa; It is big that Bearing Capacity of Composite Foundation improves scope, and the amplitude adjustment is flexible.Compare with the high-pressure rotary-spray "forming column, ablation energy required for the present invention is little, and is low for equipment requirements, loss is little; Rod boring and hoisting velocity are fast, and speed of application can improve more than 30%, and the discharge value of cement grout significantly reduces simultaneously, can wholely save 1/3 of cement consumption.
2, can be applicable to multiple soil layer.The present invention goes for the ground of soil properties such as mucky soil, clay, silt, sand, collapsible loess, plain fill and miscellaneous fill and handles.
3, can be applicable to various engineering.The present invention both can be used for the ground of existed building and new building and had handled, and also can be used for engineerings such as the support retaining of deep foundation ditch and water protecting curtain.
Description of drawings
Schematic diagram when Fig. 1 bores down in using for the present invention.
Schematic diagram when Fig. 2 gets into desired depth under the drill bit for the present invention in using.
The drill configurations schematic diagram that Fig. 3 uses for the present invention
Fig. 4 goes into the schematic diagram that the cement paste limit promotes drill bit for marginal not in the present invention's application.
Fig. 5 for the present invention use in the schematic diagram of marginal not when going into the cement paste limit and promoting drill bit and finish.
Schematic diagram when Fig. 6 recharges slurries for the present invention in using.
The specific embodiment
Describe technical scheme of the present invention in detail below in conjunction with accompanying drawing.
As shown in Figure 1, the present invention adopts in application when boring under the drill bit, bores under water with the constant speed band, and rotating speed is 20-40 commentaries on classics/min, and rate of penetration is 25-50cm/min; The diameter d of drill bit paddle should be less than or equal to the diameter (as shown in Figure 3) of boring; When getting into the desired depth of soil layer under the drill bit (as shown in Figure 2), when promoting drill bit, in the hole, inject cement paste (as shown in Figure 4) by the nozzle that is located in the drill bit, the cement paste expulsion pressure is generally 3～20Mpa, the drilling rod hoisting velocity is generally 20～200mm, subsidence velocity 20～200cm/min; After finishing the cement paste injection (as shown in Figure 5), recharge soil cement slurry or cement paste (as shown in Figure 5) to the center of stake again, with the structure of closely knit pile body, improve the quality of pile body, thereby improve the bearing capacity of ground.
Claims (4)
1, a kind of deep level jet agitation pile forming method, comprise down bore, the limit jet grouting stirs the limit and carries brills, recharges operation such as slurries, it is characterized in that: to adopt mechanical mixing method, with employing high-pressure injection method is auxilliary then in the periphery of pile body in the centre of pile.
2, a kind of deep level jet agitation pile forming method according to claim 1, it is characterized in that: the cement paste expulsion pressure is generally 3～20MPa; The drilling rod hoisting velocity is generally 20～200mm, and subsidence velocity is 20～200cm/min.
3, a kind of deep level jet agitation pile forming method according to claim 1 is characterized in that: material spray also can adopt cement mortar or cement-flying ash mortar except that cement paste.
4, according to claim 1 or 3 described a kind of deep level jet agitation pile forming methods, it is characterized in that: according to the needs of construction works, in cement mortar and cement, flyash slurries, can mix the special material that some are played a role, as materials such as rapid hardening, diminishing, slow setting dosage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA021306389A CN1482305A (en) | 2002-09-10 | 2002-09-10 | A deep level jet agitation pile forming method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA021306389A CN1482305A (en) | 2002-09-10 | 2002-09-10 | A deep level jet agitation pile forming method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1482305A true CN1482305A (en) | 2004-03-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA021306389A Pending CN1482305A (en) | 2002-09-10 | 2002-09-10 | A deep level jet agitation pile forming method |
Country Status (1)
| Country | Link |
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| CN (1) | CN1482305A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105297717A (en) * | 2015-10-30 | 2016-02-03 | 周同和 | Composite foundation pile with lower portion enlarged diameter section and construction method of composite foundation pile |
| CN106759562A (en) * | 2017-02-23 | 2017-05-31 | 陈吉鸥 | Foundation reinforcement method |
| CN113982022A (en) * | 2021-10-20 | 2022-01-28 | 兰州理工大学 | Construction method for eliminating collapsibility of cement stirring insertion pile in collapsible loess area |
-
2002
- 2002-09-10 CN CNA021306389A patent/CN1482305A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105297717A (en) * | 2015-10-30 | 2016-02-03 | 周同和 | Composite foundation pile with lower portion enlarged diameter section and construction method of composite foundation pile |
| CN106759562A (en) * | 2017-02-23 | 2017-05-31 | 陈吉鸥 | Foundation reinforcement method |
| CN113982022A (en) * | 2021-10-20 | 2022-01-28 | 兰州理工大学 | Construction method for eliminating collapsibility of cement stirring insertion pile in collapsible loess area |
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