CN1793523A - Method for construction of deep layer rotating spraying mixture pile with diffusion preventing plate - Google Patents
Method for construction of deep layer rotating spraying mixture pile with diffusion preventing plate Download PDFInfo
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- CN1793523A CN1793523A CN 200510111798 CN200510111798A CN1793523A CN 1793523 A CN1793523 A CN 1793523A CN 200510111798 CN200510111798 CN 200510111798 CN 200510111798 A CN200510111798 A CN 200510111798A CN 1793523 A CN1793523 A CN 1793523A
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- preventing plate
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- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
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Abstract
The invention relates to a deep layer rotating spaying stirring pile with diffusion preventing board construction method in building engineering technique field. It includes the following steps: flattening field; fixing stirring end; fixing stirring head at machine core pipe; hanging the stirring machine to given pile position; drill pipe is clockwise stirring sinking and spaying slurry; start up stirring machine; sinking spaying stirring until reach pile lower 10cm and change to stir; the drill pipe is counter-clockwise rotating and raising stirring end; stopping slurry spaying; raising stirring head to reach design elevation. The invention has the advantages of simple and reliable, economic and practical, and convenient construction. It can increase stirring pile strength and reduce the influence on surrounding environment.
Description
Technical field
What the present invention relates to is a kind of job practices of construction engineering technical field, specifically is a kind of job practices that has the deep layer rotating spraying mixture pile of diffusion preventing plate.
Background technology
The method that is used for reinforcing soft ground at present is numerous, and deep-mixed pile and high-pressure rotary jet grouting pile are two kinds of methods that are widely used in reinforced soft soil ground.Deep-mixed pile is stir to inject chemical curing agent (cement or lime powder or slurry) by rotating vane to mix with on-the-spot bury and form, and high-pressure rotary jet grouting pile is to shred on-the-spot bury and make it and the chemical curing agent that injects mixes with High-Pressure Water or slurry flows.The construction machinery volume of deep-mixed pile is bigger, construction inconvenience.And the construction equipment volume of high-pressure injection technology is little, is convenient in the intensive place construction of building; But it is, very big to the disturbance of surrounding soil because its spray pressure is big.In recent years, Japan combines mechanical agitation and injection stirring on the basis of these two kinds traditional deep layer chemistry foundation treatment technologies, forms a kind of new technology, i.e. deep layer rotating spraying mixture pile worker method.Deep layer rotating spraying mixture pile is after drilling rod is drilled into the soil depth of designing requirement, push cement grout to nozzle special on the drill bit from drill pipe bore with mudjack, in company with the rig rotating vane to around the soil body spray, drilling rod promotes with certain speed simultaneously, blade on the drill bit is with the constantly cutting from bottom to top of the soil body in the certain limit around it, and the jet cement slurries cut the peripheral soil body of peripheral soil stabilization in soil, stir into the cement-soil mixture and reach consolidated subsoil, improve the effect of bearing capacity of foundation soil.
Through existing technical literature retrieval is found, Yan Yi aims at " Shanxi traffic magazine ", 2004 (2), " the simple analysis rotating spraying mixture pile is to the processing of deep layer unfavorable geology " delivered on P68～69, this article has briefly introduced the deep layer rotating spraying mixture pile construction technology, it is described as deep-mixed pile pierces projected depth with the spiral drilling machine of changing a social system; With mudjack cement is sprayed into the soil body then, mixer promotes; Stir sinking more again; Stir lifting at last again.At present used deep layer rotating spraying mixture pile construction, because expulsion pressure is bigger, and stirs both actings in conjunction, easily to ground and the bigger disturbance of surrounding buildings deposits yields, soil body lateral displacement causes surface uplift, thereby influences consolidation effect.And slurries can't be controlled in the design reinforcement radius fully, thereby have influence on the slurry content of agitation pile, can not guarantee the requirement of strength of stake fully.And lifting and decline that this construction technology stirring-head all is a clockwise direction, run into like this obstruction just be difficult to handle, in case bit freezing then rod bit have to be abandoned causes economic loss.
Summary of the invention
The objective of the invention is to overcome deficiency of the prior art, the invention provides a kind of job practices that has the deep layer rotating spraying mixture pile of diffusion preventing plate, effectively solve the disturbance of many surrounding soils in the deep layer rotating spraying whipping process, pile body cement paste content is inhomogeneous, and in the problem that constructional difficulties on the obstruction ground is arranged.
The present invention is achieved by the following technical solutions, may further comprise the steps:
(1) leveling place, fixedly stirring-head and location.The stirring-head that will have the deep layer rotating spraying mixture pile of diffusion preventing plate and two mouth sprays is fixed on and stirs on the movement pipe, and crane suspention mixer is to specifying stake position and centering.
(2) drilling rod stirs and whitewashing clockwise.Confirm that slurries startup mixer when mouth spray spray turns clockwise downwards and creep into.Pull out native toothed portion and stir the body that loosens the soil, the further cutting soil of middle compressed water slurry liquid of two mouth spray ejections also makes both combinations.Upper and lower two-layer rotating vane is rotated down further under the drive of core pipe and mixes.Diffusion preventing plate stops the disturbance of expulsion pressure to the soil body outside the design reinforcement district.
(3) continue to sink to spraying to stir behind set depth under the stake, to continue to stir half a minute.
(4) drilling rod is rotated counterclockwise the lifting stirring-head, at this moment stops whitewashing.When drilling rod was rotated counterclockwise, upper and lower two-layer rotating vane can continue to mix the soil body.
(5) continue to promote stirring-head to face of land design elevation, finish the construction of a rotating spraying mixture pile.
Two mouth spray pressure are 4～10MPa, and middle pressure mouth spray welds four respectively and pulls out native tooth on the core pipe on lower floor's rotating vane, and diffusion preventing plate is welded on lower floor's rotating vane.Press mouth spray to be positioned at the both sides of lower floor's rotating vane in two, and with the same distribution of lower floor's rotating vane.
Job practices of the present invention is simple and reliable, and is economical and practical, easy to process.Be applied to reinforcing soft ground, overcome the weak point that traditional deep spray stirs, can improve the uniformity of pile body, thereby improve the intensity of agitation pile, reduce influence surrounding environment.Small-sized churning equipment is used in stirs in the construction, guarantee the diameter of stake simultaneously.For technical condition are created in construction in intensive building.
Description of drawings
Fig. 1 is the inventive method flow chart.
The specific embodiment
Below in conjunction with the invention provides embodiment, present embodiment adopts a kind of job practices of the deep layer rotating spraying mixture pile with diffusion preventing plate and two mouth sprays:
The test site is the mixing pile construction in certain express highway roadbed stabilization works.This basis, district mostly is soft layer, and upper soil horizon is many to be banketed and formed by miscellaneous fill, plain fill, mud matter, and this part soil structure is loose, the natural moisture content height, and compressibilty is big, and shear strength is low, and physical state is soft moulding to stream more moulds, so the engineering property extreme difference.Below 7 meters based on isabelline sandy loam, water content is about 42%.According to this district's soil body engineering properties, it is reinforcing road bed to determine to select to use cement mixing method herein, and designing pile length is 13 meters, and diameter is Φ 800mm, water/binder ratio 1: 0.5.Agitation pile with the construction of the deep layer rotating spraying mixture pile of band diffusion preventing plate and two mouth sprays is 4,4 of the agitation piles of constructing with traditional worker's method.
The construction sequence of test pile as shown in Figure 1 1. 2. 3. 4. 5., specify as follows:
1. flatten the place, fixedly stirring-head and location.The stirring-head that will have the deep layer rotating spraying mixture pile of diffusion preventing plate and two mouth sprays is fixed on and stirs on the movement pipe, and crane suspention mixer is to specifying stake position and centering.
2. drilling rod stirs and whitewashing clockwise.Confirm that slurries startup mixer when mouth spray spray turns clockwise downwards and creep into.Pull out native toothed portion and stir the body that loosens the soil, the further cutting soil of middle compressed water slurry liquid of two mouth spray ejections also makes both combinations.Upper and lower two-layer rotating vane is rotated down further under the drive of core pipe and mixes.Diffusion preventing plate stops the disturbance of expulsion pressure to the soil body outside the design reinforcement district.Spray pressure is 8MPa, and the stirring speed of rotation is 20rpm, and subsidence velocity is 0.3m/min.
3. continue to sink to spraying to stir, continue to stir half a minute until 13.1m.
4. drilling rod is rotated counterclockwise the lifting stirring-head, at this moment stops whitewashing.During reverse, upper and lower blade can continue to mix the soil body.Rotary speed is 50rpm, and hoisting velocity is 1m/min.
5. continue to promote stirring-head, finish the construction of a rotating spraying mixture pile to face of land design elevation.
The scene is got the core result of the test and shown, and is good with the pile quality of the stake of the stirring-head construction of band diffusion preventing plate and two mouth sprays, the mixing of cement grout and bury.And speed of application is about 0.3m/min, is higher than the job practices of traditional deep layer rotating spraying mixture pile greatly.Test shows that the job practices of the deep layer rotating spraying mixture pile that adopts band diffusion preventing plate and two mouth sprays can improve efficiency of construction greatly.
Claims (6)
1, a kind of job practices that has the deep layer rotating spraying mixture pile of diffusion preventing plate is characterized in that, may further comprise the steps:
(1) leveling place, fixedly stirring-head and location: the stirring-head that will have the deep layer rotating spraying mixture pile of diffusion preventing plate and two mouth sprays is fixed on and stirs on the movement pipe, and crane suspention mixer is to specifying stake position and centering;
(2) drilling rod stirs clockwise and sinks and whitewashing: confirm that slurries startup mixer when mouth spray spray turns clockwise downwards and creep into, pull out native toothed portion and stir the body that loosens the soil, the further cutting soil of middle compressed water slurry liquid of two mouth spray ejections also makes both combinations, upper and lower two-layer rotating vane is rotated down further under the drive of core pipe and mixes, and diffusion preventing plate stops the disturbance of expulsion pressure to the soil body outside the design reinforcement district;
(3) continue to sink to spraying to stir behind set depth under the stake, to continue to stir;
(4) drilling rod is rotated counterclockwise the lifting stirring-head, at this moment stops whitewashing;
(5) continue to promote stirring-head to face of land design elevation, finish the construction of a rotating spraying mixture pile.
2, the job practices that has the deep layer rotating spraying mixture pile of diffusion preventing plate according to claim 1 is characterized in that, diffusion preventing plate is welded on lower floor's rotating vane.
3, the job practices that has the deep layer rotating spraying mixture pile of diffusion preventing plate according to claim 1 is characterized in that, two mouth spray pressure are 4～10MPa, and mouth spray is on the core pipe.
4, according to claim 1 or the 2 described job practicess that have the deep layer rotating spraying mixture pile of diffusion preventing plate, it is characterized in that two mouth sprays are positioned at the both sides of lower floor's rotating vane, and with the same distribution of lower floor's rotating vane.
5, the job practices that has the deep layer rotating spraying mixture pile of diffusion preventing plate according to claim 1 is characterized in that, pull out native toothed portion promptly four pull out native tooth and be welded on lower floor's rotating vane.
6, the job practices that has the deep layer rotating spraying mixture pile of diffusion preventing plate according to claim 1 is characterized in that, when drilling rod was rotated counterclockwise, upper and lower two-layer rotating vane can continue to mix the soil body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005101117988A CN100366828C (en) | 2005-12-22 | 2005-12-22 | Method for construction of deep layer rotating spraying mixture pile with diffusion preventing plate |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005101117988A CN100366828C (en) | 2005-12-22 | 2005-12-22 | Method for construction of deep layer rotating spraying mixture pile with diffusion preventing plate |
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| Publication Number | Publication Date |
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| CN1793523A true CN1793523A (en) | 2006-06-28 |
| CN100366828C CN100366828C (en) | 2008-02-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2005101117988A Expired - Fee Related CN100366828C (en) | 2005-12-22 | 2005-12-22 | Method for construction of deep layer rotating spraying mixture pile with diffusion preventing plate |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115075231A (en) * | 2022-08-19 | 2022-09-20 | 中铁三局集团有限公司 | Construction device and construction method for soft soil foundation reinforcement |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1078519A (en) * | 1992-05-12 | 1993-11-17 | 王英权 | Pile-making method by drilling-slurry and drilling tool rotary spray apparatus |
| JP3280710B2 (en) * | 1992-07-17 | 2002-05-13 | 財団法人土木研究センター | Ground improvement method |
| JPH06146259A (en) * | 1992-11-10 | 1994-05-27 | Ask Kenkyusho:Kk | Forming method of columnar body in ground |
| CN100336982C (en) * | 2004-12-23 | 2007-09-12 | 东南大学 | Nail type cement soil stirring pile operation method |
| CN1274912C (en) * | 2004-12-23 | 2006-09-13 | 东南大学 | Pile forming operation method for bi-directional stirring piles |
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2005
- 2005-12-22 CN CNB2005101117988A patent/CN100366828C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115075231A (en) * | 2022-08-19 | 2022-09-20 | 中铁三局集团有限公司 | Construction device and construction method for soft soil foundation reinforcement |
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| CN100366828C (en) | 2008-02-06 |
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Granted publication date: 20080206 Termination date: 20111222 |