CN104895064A - Deep cement mixing pile construction process - Google Patents
Deep cement mixing pile construction process Download PDFInfo
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- CN104895064A CN104895064A CN201510221604.3A CN201510221604A CN104895064A CN 104895064 A CN104895064 A CN 104895064A CN 201510221604 A CN201510221604 A CN 201510221604A CN 104895064 A CN104895064 A CN 104895064A
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Abstract
The invention discloses a deep cement mixing pile construction process. The process at least comprises steps of pile testing, sampling and mixing; in the mixing process, the sinking speed of an agitator is 0.38-0.75 m/min; a mortar pump is started in the sinking process for spraying while rotating; and the water flushing is stopped. In the mixing process, the rising speed of the agitator is 0.3-0.5 m/min; and in the rising process, the mortar pump reversely rotates while spraying. The process has such advantages as short construction period, low manufacturing cost and prominent benefit, is wide in application prospect, and is prominent in effect on soft soil.
Description
Technical field:
The present invention relates to a kind of engineering construction process, be specifically related to a kind of deep cement-mixed pile construction technology.
Background technology:
Soil-cement mixed pile foundation is current widely used foundation treatment technology, is characterized in friction, noiselessness in ground stabilization process, to soil without extruding of leaning to one side, little to closing on Influence on Architecture, can comparatively fast come into operation after process.But in work progress, how effectively to control the pile quality of agitation pile, guarantee that the effect for the treatment of of soft foundation has just become us to need the problem explored and study.
Summary of the invention:
The object of this invention is to provide a kind of deep cement-mixed pile construction technology, at least comprise test pile, setting-out, whipping step, in whipping process, mixer subsidence velocity 0.38-0.75m/min, opens mortar pump in sinking watching, and spray limit, limit rotates, and stops bath.
In whipping process, mixer hoisting velocity is 0.3-0.5m/min, in lifting process, and the spray limit despining of mortar pump limit.
When repeating to stir, can accelerate rotary speed, but be no more than 1.8m/min, spray pressure is not less than 0.5kPa.
The advantages such as construction period of the present invention short, cheap, remarkable benefit, have broad application prospects, to weak soil Be very effective.
Detailed description of the invention:
A kind of deep cement-mixed pile construction technology, main construction sequence is as follows:
Accurately release control stake according to drawing, make the stake position of agitation pile according to control stake, and adopt bamboo let to indicate the stake position of every stake, facilitate mixer contraposition.
Cement mixing pile tackles pile foundation performance after marching into the arena checks, and debugs, and guarantees that duty is good; Various instrument being demarcated simultaneously, preventing from being forbidden to cause quality accident because measuring in work progress.
After pre-blending machine is in place, start mixer motor, loosen crane rope, just mixer stirs along saddle and cuts soil sinking, the speed of sinking can be controlled (being generally 0.38m/min-0.75m/min) by the current monitoring table of motor, and operating current should not be greater than 40A.Opening mortar pump when mixer sinks is pressed in ground by cement paste, crosses spray limit and rotates.When mixer stirs sinking in advance, should not wash by water.Do not allow during stirring to occur that stirring pile crown does not arrive the phenomenon that stake top slurries have mixed.Once stop slurry for some reason, for preventing broken pile and lacking slurry, mixer should sink to stopping the following 0.5m of slurry point, to be restored for lifting of whitewashing again after slurry.
Configuration cement paste before boring under mixer, cement paste is prepared in strict accordance with design mixture proportion, and the various raw material strict measurement such as cement, Admixture, admixture, guarantee that match ratio is accurate.Mixing time is determined by test process, cement paste with mix with, stir without agglomerate, occur that the cement paste of initial set must not use.The cement slurry volume at every turn stirred slightly more than the consumption of a pile, should treat that mud jacking is front by cement paste correct copy aggregate bin.
After mixer sinks to arriving projected depth, opening mortar pump and cement paste is pressed in soil layer, limit spray limit despining, promoting mixer (being generally 0.3m/min-0.5m/min) in strict accordance with designing the hoisting velocity determined simultaneously.Pile will control the hoisting velocity of mixer, makes continuous uniform, to control grouting amount, ensures to stir, and simultaneous pumping must be continuously.
Repeat to stir up and down
After when mixer is promoted to the end face absolute altitude of the design reinforcement degree of depth, stir for making weak soil and cement paste, rotation limit, Dou mixer limit is sunk in soil again, again mixer spray is lifted out ground, so just completes the construction of an agitation pile to the design reinforcement degree of depth.
Essentials for Construction Control:
1., before pumps water mud, with all pipelines of clean water, guarantee that pipeline is without clogging, pipeline should be kept moistening, in order to defeated slurry simultaneously.
2. the perpendicularity deviation of agitation pile is not more than 1%, and the plan-position deviation of stake is not more than 5cm.For guaranteeing that cement mixing pile pile body verticality meets code requirement, an outstanding vertical on axle of stirrer frame, carries out by the distance measured between vertical line and drilling rod the verticality controlling pile body.
3. before mud jacking, cement paste can not be emanated, and the match ratio that cement paste will be determined in strict accordance with test pile is configured, and before mud jacking, cement constantly stirs in grey pulp grinder.
4. for guaranteeing that cement paste match ratio is accurate, scene should weigh cement weight in strict accordance with the match ratio determined, measure the volume of water.Be equipped with cement paste hydrometer at the scene, if special messenger measures cement paste water/binder ratio simultaneously.
5. bore under first time and must adopt low-grade rotation when carrying brill, prevent running into hard formation and twist into two parts drilling rod or damage drill bit, can accelerate rotary speed when stirring again, spray pressure is not less than 0.5kPa.But even for guaranteeing pile quality, speed-raising is unsuitable too fast, hoisting velocity should more than 1.8m/min, otherwise there will be that pile body cement amount is not enough or cement is uneven in soil, causes strength of the mixing pile uneven.
6. should not wash by water when mixer stirs sinking in advance, when run into hard formation resistance comparatively large or creep into slower time, mixer deadweight should be increased and then start water booster system pressurization, or input slurries limit, limit is stirred and is crept into.
7. for guaranteeing the pile quality at the bottom of stake top and stake, carry creep into can at the bottom of stake and stake top bit stop 30s, and drill bit continue whitewashing.
Claims (3)
1. a deep cement-mixed pile construction technology, at least comprises test pile, setting-out, whipping step, it is characterized in that, in whipping process, mixer subsidence velocity 0.38-0.75m/min, opens mortar pump in sinking watching, and spray limit, limit rotates, and stops bath.
2. a kind of deep cement-mixed pile construction technology according to claim 1, it is characterized in that: in whipping process, mixer hoisting velocity is 0.3-0.5m/min, in lifting process, the spray limit despining of mortar pump limit.
3. a kind of deep cement-mixed pile construction technology according to claim 1, is characterized in that: when repeating to stir, can accelerate rotary speed, but be no more than 1.8m/min, spray pressure is not less than 0.5kPa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510221604.3A CN104895064A (en) | 2015-04-30 | 2015-04-30 | Deep cement mixing pile construction process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510221604.3A CN104895064A (en) | 2015-04-30 | 2015-04-30 | Deep cement mixing pile construction process |
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| Publication Number | Publication Date |
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| CN104895064A true CN104895064A (en) | 2015-09-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510221604.3A Pending CN104895064A (en) | 2015-04-30 | 2015-04-30 | Deep cement mixing pile construction process |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5631928A (en) * | 1979-08-20 | 1981-03-31 | Ryoji Morita | Constructing method for soil pile |
| CN101864765A (en) * | 2010-06-30 | 2010-10-20 | 东南大学 | Two-way stirring based SMW construction method and tri-axial stirring equipment |
| CN102021906A (en) * | 2010-12-16 | 2011-04-20 | 河南省新开元路桥工程咨询有限公司 | Method for reinforcing soft soil foundation at deep mixing pile |
| CN103422497A (en) * | 2013-08-21 | 2013-12-04 | 国家电网公司 | Method for reinforcing soft soil foundation by using cement-soil mixing pile |
-
2015
- 2015-04-30 CN CN201510221604.3A patent/CN104895064A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5631928A (en) * | 1979-08-20 | 1981-03-31 | Ryoji Morita | Constructing method for soil pile |
| CN101864765A (en) * | 2010-06-30 | 2010-10-20 | 东南大学 | Two-way stirring based SMW construction method and tri-axial stirring equipment |
| CN102021906A (en) * | 2010-12-16 | 2011-04-20 | 河南省新开元路桥工程咨询有限公司 | Method for reinforcing soft soil foundation at deep mixing pile |
| CN103422497A (en) * | 2013-08-21 | 2013-12-04 | 国家电网公司 | Method for reinforcing soft soil foundation by using cement-soil mixing pile |
Non-Patent Citations (1)
| Title |
|---|
| 郝一鸣: "《深层水泥土搅拌桩在地基处理中的应用》", 《门窗》, no. 10, 20 October 2014 (2014-10-20), pages 113 * |
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Application publication date: 20150909 |
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