CN104480932B - The soft base cement mixing pile construction method of saline alkali mud matter - Google Patents
The soft base cement mixing pile construction method of saline alkali mud matter Download PDFInfo
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- CN104480932B CN104480932B CN201410771976.9A CN201410771976A CN104480932B CN 104480932 B CN104480932 B CN 104480932B CN 201410771976 A CN201410771976 A CN 201410771976A CN 104480932 B CN104480932 B CN 104480932B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
- E02D5/46—Concrete or concrete-like piles cast in position ; Apparatus for making same making in situ by forcing bonding agents into gravel fillings or the soil
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2250/00—Production methods
- E02D2250/0038—Production methods using an auger, i.e. continuous flight type
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2250/00—Production methods
- E02D2250/0061—Production methods for working underwater
- E02D2250/0076—Drilling
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0004—Synthetics
- E02D2300/0018—Cement used as binder
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- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The present invention relates to cement mixing pile piling technique field, disclose a kind of soft base cement mixing pile construction method of saline alkali mud matter, comprise the following steps: S1, it would be desirable to the levelling of the land of construction; S2, is transported to place to be onstructed by mixing pile machine, by establishing fixed pile location and centering, connects and send slurry pump; S3, starts mixing pile machine, sinks to stirring first; S4, whitewashing first promotes stirs; S5, repeats to sink to stirring: the sinking velocity of drill bit is 0.3��0.6m/min, sinks at the bottom of being stirred to; S6, repeats whitewashing and promotes stirring; S7, third time sinks to stirring; S8, third time promotes stirring; S9, closes mixing pile machine, and complete machine is displaced to the finger fixed pile of next pile, repeats above often step operation, completes next root mixing pile. The present invention adopts two sprays six to stir constructional method, reduces the use of cement resource, reduces construction costs.
Description
Technical field
The present invention relates to cement mixing pile piling technique field, particularly relate to a kind of soft base cement mixing pile construction method of saline alkali mud matter.
Background technology
Soft Ground in building foundation engineering is the key link ensureing construction quality, and occupies larger proportion in engineering total price. A large amount of engineering practice shows, the method for mixing cement and soil into pile have construction simple, fast, vibrate the advantages such as little, can effectively improve the stability of soft clay ground, reduce and control settlement amount. Cement mixing method is existing, and oneself develops into a kind of conventional Soft foundation treatment method, is mainly applicable to reinforce saturated soft clay foundation. It specifically uses mixing pile machine to enter in weak soil by solidifying agent pumps such as cement (or lime), and on the spot weak soil and solidifying agent are stirred by the agitating vane of mixing pile machine, make to mix between solidifying agent with weak soil, mainly it is applicable to saturated soft clay, cohesive soil, powder soil, plain fill and the saturated sand soil base without flowing underground water.
Middle Tie Shijiuju group front village railway three work area project management department starts cement mixing pile technical testing pile. Owing to actual geological condition follows the geologic description of design paper to differ greatly, part location is the mud of the soft north flow-like of saline alkali even entirely, and be mingled with and have loose sand layer and powder matter clay layer, very complicated, the stake body soil cement intensity of the technical testing pile that therefore employing in early stage " two sprays two are stirred " and " two sprays four are stirred " are constructed and Bearing Capacity of Composite Foundation all fail to meet design requirement, only there is " three stir six sprays " constructional method can meet requirement, but three constructional methods stirring six sprays need to expend huge cement resource, construction costs height.
Therefore, it is badly in need of wanting a kind of soft base cement mixing pile construction method of saline alkali mud matter that can reduce construction costs.
Summary of the invention
(1) technical problem solved
It is an object of the invention to provide a kind of soft base cement mixing pile construction method of saline alkali mud matter, adopt two sprays six to stir constructional method, reduce the use of cement resource, reduce construction costs.
(2) technical scheme
In order to solve the problems of the technologies described above, the present invention provides a kind of soft base cement mixing pile construction method of saline alkali mud matter, comprises the following steps:
S1, it would be desirable to the levelling of the land of construction;
S2, is transported to place to be onstructed by mixing pile machine, by establishing fixed pile location and centering, connects and send slurry pump;
S3, starts mixing pile machine, sinks to stirring first: the sinking velocity of drill bit is 0.2��0.5m/min, when operator feels that fuselage starts shake, drill bit sinks and obviously becomes slow, and drill bit starts to enter ground bearing stratum, continue to creep into until drill bit no longer sinks, stop creeping into;
S4, whitewashing first promotes stirs: after stopping is crept into, opens and send slurry pump, send slurry pump to carry cement grout in the soil body, changes the turning direction of drill bit, and guarantee lasting stirring 30��50s; Then starting whitewashing limit, limit to promote, the pulling speed of drill bit is 0.3��0.6m/min, is promoted to stake top and stops promoting, and continue stirring 5��20s, closes and send slurry pump;
S5, repeats to sink to stirring: the sinking velocity of drill bit is 0.3��0.6m/min, sinks at the bottom of being stirred to;
S6, repeats whitewashing and promotes stirring: open and send slurry pump to carry out repeating whitewashing, and stir lifting, the pulling speed 0.3��0.6m/min of drill bit simultaneously, be promoted to stake top and stop lifting, and continue stirring 5��20s, close and send slurry pump;
S7, third time sinks to stirring: the sinking velocity of drill bit is 0.3��0.6m/min, sinks at the bottom of being stirred to;
S8, third time promotes stirring: the pulling speed of drill bit is 0.3��0.6m/min, and drill bit is promoted to more than earth's surface 30��50cm;
S9, closes mixing pile machine, and complete machine is displaced to the finger fixed pile of next pile, repeats above often step operation, completes next root mixing pile.
Wherein, step S0 was also comprised before step S3, prepare cement grout, and to giving slurry pump to provide cement grout: cement grout adopts ordinary Portland cement, water cement ratio is 0.48��0.5, cement grout proportion is 1.86��1.87g/ml, it may also be useful to cement grout is stirred by concrete mixer, often the dish cement grout mixing time 30��80min.
Wherein, described ordinary Portland cement is P O42.5.
Wherein, in step S5, S6, S7 and/or S8, change the turning direction of drill bit respectively.
Wherein, in step S5, S7 and S8, keep sending slurry pump to have pressure.
(3) useful effect
The soft base cement mixing pile construction method of saline alkali mud matter provided by the invention, adopts the constructional method of " two sprays six are stirred ", simple to operate, is beneficial to popularization; Relative to " two spray two stirs " and " two sprays four are stirred " constructional method of routine, the stirring number of times increase of the soil body and cement grout, it is ensured that pile quality, especially under saline alkali soft foundation; Stirring number of times increases, and accumulative whitewashing amount and more conventional twice whitewashing of whitewashing number of times do not increase, and again relative to " three sprays six are stirred " constructional method, decrease and once whitewash, saved the construction material of 1/3, energy-conserving and environment-protective.
Accompanying drawing explanation
Fig. 1 is the schema of the embodiment of the present invention;
Fig. 2 is the construction schematic diagram of the embodiment of the present invention.
Embodiment
Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail. Following instance is for illustration of the present invention, but is not used for limiting the scope of the invention.
Shown in reference Fig. 1 and 2, the soft base cement mixing pile construction method of the saline alkali mud matter of the present invention, the present embodiment adopts SP-5 mixing pile machine to carry out operating (being not limited to use this kind of mixing pile machine), comprises the following steps:
Step S1, it would be desirable to the levelling of the land of construction.
Step S2, is transported to place to be onstructed by SP-5 mixing pile machine, by establishing fixed pile location and centering, connects and send slurry pump.
Step S3, start the mair motor of mixing pile machine, sink to stirring first: the sinking velocity of drill bit is 0.2��0.5m/min, when operator feels that fuselage starts shake, drill bit sinks and obviously becomes slow, and reometer stable reading is when 90A��100A, illustrates that drill bit has started to enter ground bearing stratum, continue to creep into until drill bit no longer sinks, stop creeping into. Starting the mair motor of mixing pile machine, drive drill bit rotational, meanwhile, drill bit sinks, and sinking velocity can be 0.2m/min, 0.3m/min, 0.4m/min or 0.5m/min; When drill bit sinking obviously becomes slow, when drill bit drill speed is lower than 0.2m/min, it is possible to think that drill bit no longer sinks, now stop creeping into.
Step S4, whitewashing first promotes stirs: after stopping is crept into, opens and send slurry pump, send slurry pump to carry cement grout in the soil body, changes the turning direction of drill bit, and guarantee lasting stirring 30��50s; Then starting whitewashing limit, limit to promote, the pulling speed of drill bit is 0.3��0.6m/min, such as: 0.3m/min, 0.4m/min or 0.6m/min, it is promoted to stake top to stop promoting, and continues stirring 5��20s, as: 5s, 10s, 15s or 20s, to guarantee stake head degree of compactness, close and send slurry pump. It should be noted that, as visual inspection stake top portion soil mass water mud is not enough, it is necessary to suitably benefit is starched and continued to stir the longer time.
Step S5, repeats to sink to stirring: the sinking velocity of drill bit is 0.3��0.6m/min, sinks at the bottom of being stirred to.
Step S6, repeat whitewashing and promote stirring: open and send slurry pump to carry out repeating whitewashing, and stir lifting simultaneously, pulling speed 0.3��the 0.6m/min of drill bit, such as: 0.3m/min, 0.4m/min or 0.6m/min, it is promoted to stake top and stops promoting, and continue stirring 5��20s such as 5s, 10s, 15s or 20s, to guarantee stake head degree of compactness, close and send slurry pump. It should be noted that, as visual inspection stake top portion soil mass water mud is not enough, it is necessary to suitably benefit is starched and continued to stir the longer time.
Step S7, third time sinks to stirring: the sinking velocity of drill bit is 0.3��0.6m/min, such as: 0.3m/min, 0.5m/min or 0.6m/min, sinks at the bottom of being stirred to.
Step S8, third time promotes stirring: the pulling speed of drill bit is 0.3��0.6m/min, and such as: 0.3m/min, 0.5m/min or 0.6m/min, drill bit is promoted to more than earth's surface 30��50cm;
Step S9, closes mixing pile machine, and complete machine is displaced to the finger fixed pile of next pile, repeats above often step operation, completes next root mixing pile.
Above-mentioned construction procedure forms the bore forming method of " two sprays six are stirred ", when not increasing use cement amount and increase whitewashing number of times, improve the mixed effect of cement grout and the soil body, improve the intensity of concrete stake, the ability of the saline alkali soft base of mud matter is reinforced in refinforced cement stake, make it intensity and meet design requirements, save cement consumption, reduce construction costs.
Wherein, the present invention starts also to comprise step S0 before sinking is stirred in the mixing pile machine of step S3, prepare cement grout, and to giving slurry pump to provide cement grout: cement grout adopts ordinary Portland cement, water cement ratio is 0.48��0.5, such as: 0.48, 0.49 or 0.5, cement grout proportion is 1.86��1.87g/ml, concrete mixer is used to be stirred by cement grout, the often dish cement grout mixing time 30��80min, when needing, the intensity of cement grout is more strong, the time then made is more long, as can mixing 30min, 40min, 45min, 50min or 80min. concrete, ordinary Portland cement preferably adopts P O42.5, it is also possible to adopt 42.5R, 52.5,52.5R. the step preparing cement grout can carry out with smooth workyard simultaneously, it is also possible to while installing mixing pile machine, slurries are stirred in preparation. after pile completes, the cement of cement mixing method is reinforce wet soil weight 18%, and pile cement consumption is 67.1kg/m.
Further, above-mentioned step S5, S6, S7 and/or S8 can also change the turning direction of drill bit respectively, to make cement grout mix with the soil body better.
Further, in step S5, S7 and S8, keep sending slurry pump to have pressure, avoid cement grout and the soil body to send slurry pump from counter being poured into of mouth spray, reduce the pile quality of mixing pile, avoid causing danger simultaneously.
It should be noted that, stir and heavy whitewashing promotes in the process stirred whitewashing first to promote, have following some should be noted that:
1) continuously, must not must arbitrarily stop, to avoid plugging for slurry;
2) stop slurry face and must exceed design 0.3m;
3) pulling speed should not be too fast, avoids a body soil body to form cavity so that broken pile;
4) field technician to be counted accurate recording whitewashing amount according to automatic flow.
The present invention adopts two to spray six constructional methods stirred, simple to operate, is beneficial to popularization; Relative to " two spray two stirs " and " two sprays four are stirred " constructional method of routine, the stirring number of times increase of the soil body and cement grout, it is ensured that pile quality, especially under saline alkali soft foundation; Stirring number of times increases, and accumulative whitewashing amount and more conventional twice whitewashing of whitewashing number of times do not increase, and again relative to " three sprays six are stirred " constructional method, decrease and once whitewash, saved the construction material of 1/3, energy-conserving and environment-protective.
The foregoing is only the better embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment of doing, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (5)
1. the soft base cement mixing pile construction method of saline alkali mud matter, it is characterised in that, comprise the following steps:
S1, it would be desirable to the levelling of the land of construction;
S2, is transported to place to be onstructed by mixing pile machine, by establishing fixed pile location and centering, connects and send slurry pump;
S0, prepares cement grout, and to giving slurry pump to provide cement grout;
S3, starts mixing pile machine, sinks to stirring first: the sinking velocity of drill bit is 0.2��0.5m/min, when operator feels that fuselage starts shake, drill bit sinks and obviously becomes slow, and drill bit starts to enter ground bearing stratum, continue to creep into until drill bit no longer sinks, stop creeping into; S4, whitewashing first promotes stirs: after stopping is crept into, opens and send slurry pump, send slurry pump to carry cement grout in the soil body, changes the turning direction of drill bit, and guarantee lasting stirring 30��50s; Then starting whitewashing limit, limit to promote, the pulling speed of drill bit is 0.3��0.6m/min, is promoted to stake top and stops promoting, and continue stirring 5��20s, closes and send slurry pump;
S5, repeats to sink to stirring: the sinking velocity of drill bit is 0.3��0.6m/min, sinks at the bottom of being stirred to;
S6, repeats whitewashing and promotes stirring: open and send slurry pump to carry out repeating whitewashing, and stir lifting, the pulling speed 0.3��0.6m/min of drill bit simultaneously, be promoted to stake top and stop lifting, and continue stirring 5��20s, close and send slurry pump;
S7, third time sinks to stirring: the sinking velocity of drill bit is 0.3��0.6m/min, sinks at the bottom of being stirred to;
S8, third time promotes stirring: the pulling speed of drill bit is 0.3��0.6m/min, and drill bit is promoted to more than earth's surface 30��50cm;
S9, closes mixing pile machine, and complete machine is displaced to the finger fixed pile of next pile, repeats above often step operation, completes next root mixing pile.
2. the soft base cement mixing pile construction method of saline alkali mud matter as claimed in claim 1, it is characterized in that, in step so), cement grout adopts ordinary Portland cement, water cement ratio is 0.48��0.5, cement grout proportion is 1.86��1.87g/ml, it may also be useful to cement grout is stirred by concrete mixer, often the dish cement grout mixing time 30��80min.
3. the soft base cement mixing pile construction method of saline alkali mud matter as claimed in claim 2, it is characterised in that, described ordinary Portland cement is P O42.5.
4. the soft base cement mixing pile construction method of saline alkali mud matter as claimed in claim 1, it is characterised in that, step S5, S6, S7 and/or S8 change the turning direction of drill bit respectively.
5. the soft base cement mixing pile construction method of saline alkali mud matter as claimed in claim 1, it is characterised in that, in step S5, S7 and S8, keep sending slurry pump to have pressure.
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| CN201410771976.9A CN104480932B (en) | 2014-12-15 | 2014-12-15 | The soft base cement mixing pile construction method of saline alkali mud matter |
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| CN201410771976.9A CN104480932B (en) | 2014-12-15 | 2014-12-15 | The soft base cement mixing pile construction method of saline alkali mud matter |
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| CN109826176B (en) * | 2019-03-05 | 2021-05-07 | 车明凤 | Pipe trench engineering construction process for coastal special silt geology |
| CN109914401A (en) * | 2019-04-18 | 2019-06-21 | 上海强劲地基工程股份有限公司 | Superficial layer of sand or saturation layer of sand cement-soil stirring pile construction device and method |
| CN110284498B (en) * | 2019-07-02 | 2022-02-11 | 国网江苏省电力有限公司连云港供电分公司 | Bidirectional stirring method for manufacturing club-footed powder-spraying pile by using alkaline residues |
| CN112813967A (en) * | 2020-12-26 | 2021-05-18 | 江苏盛泰建设工程有限公司 | Intelligent control method for pile length operation in construction of cement-soil mixing pile |
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| 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 |
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Patent Citations (4)
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| 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 |
| CN103669339A (en) * | 2012-08-28 | 2014-03-26 | 李孝虎 | Wet jetting pile construction technology for strengthening soft soil foundation |
| 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 |
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