CN102677662A - Construction method of cement-mixed pile for treating coastal soft soil foundation - Google Patents
Construction method of cement-mixed pile for treating coastal soft soil foundation Download PDFInfo
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- CN102677662A CN102677662A CN2012101627232A CN201210162723A CN102677662A CN 102677662 A CN102677662 A CN 102677662A CN 2012101627232 A CN2012101627232 A CN 2012101627232A CN 201210162723 A CN201210162723 A CN 201210162723A CN 102677662 A CN102677662 A CN 102677662A
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Abstract
The invention discloses a construction method of a cement-mixed pile for treating a coastal soft soil foundation, comprising the following steps of: (1) pouring cement slurry into a collection hopper of a mortar pump, starting the mortar pump, starting a motor of a mixer when slurry is sprayed out of a slurry spraying tube of the mortar pump, and then, enabling the mixer to simultaneously spray slurry, mix and sink along a guide frame, wherein the sinking speed is controlled at 1.0-1.2m/min; (2) stopping spraying slurry after the mixer sinks to the designed depth, and enabling the mixer to mix and lift at the speed of 0.8-1.0m/min; (3) repeating the steps of (1) and (2); (4) repeating the steps (1) and (2) again; and (5) moving a pile driver to carry out construction on the next pile. By using the method, cement and clay can be better and uniformly mixed and 70 piles can be driven by each pile driver every day; and the cement-mixed pile is variable in strength and strong in applicability.
Description
Technical field
The present invention relates to the cement mixing pile job practices, relate in particular to coastal Soft Ground cement mixing pile job practices.
Background technology
Mostly the coastal area is that lower reaches of river impacts marine plain, the huge thick loose sediment of several times extra large Lu Bianqian deposition, and face of land artificial earth fill's layer about 1m, is main with cohesive soil generally.It is mainly silt and silty clay down to about-15m, be in soft north state, and extremely unstable behind the pressurized, coastal area amount of precipitation is bigger, and ground is treated as emphasis, the difficult point that guarantees workmanship.
Summary of the invention
The objective of the invention is to overcome the shortcoming of prior art, a kind of raising reinforcing soft ground effect is provided, can reaches the foundation bearing requirement, save the coastal Soft Ground cement mixing pile job practices of a large amount of cement.
Coastal Soft Ground cement mixing pile job practices of the present invention, it may further comprise the steps:
(1) whitewashing is sunk: cement paste is poured in the aggregate bin of mortar pump; Open mortar pump; When the shotcrete pipe of mortar pump has slurry to occur, start the motor of mixer, make mixer stir sinking while whitewashing then along leading truck; Subsidence velocity is controlled at 1.0-1.2m/min, at the submergence depth that marks the drilling tool of installing on the mixer on the boring tower with mark;
(2) stir lifting: after mixer sinks to projected depth, stop slurry, the speed stirring lifting with 0.8-1.0m/min for guaranteeing the intensity of pile crown, is stirred to more than the ground;
(3) repeating said steps (1) and (2), wherein subsidence velocity is controlled at 1.0-1.3m/min; Stir hoisting velocity and be controlled at 1.2-1.4m/min;
(4) repeating said steps (1) and (2) once more, wherein subsidence velocity is controlled at 1.3-1.4m/min, stirs hoisting velocity and is controlled at 0.5-0.8m/min;
(5) move the stake machine, carry out the construction of next pile.
The beneficial effect of the inventive method is: 1, easy construction, saving duration: needn't be with the clear water pipe again on the mixer; Also need not build reservoir again; In the process that whitewashing is sunk, the water filling effect has also been played in whitewashing, creeps into difficulty when having avoided dried stirring; Cement and soil can better evenly be mixed and stirred, and every bench drill machine can be driven piles 70 pieces/day.2, intensity variable, applicability are strong: the pile strength of cement mixing pile can be a variable element according to designing requirement, realizes through repeating to whitewash, and increases cement mixing content, improves pile strength.According to the requirement of superstructure, agitation pile can be arranged to column, wall shape and block three kinds of reinforcing forms, forms multiple carrying form, and this is that other type does not possess.3, environmental protection, expense are low: cement stirs friction, noiselessness, non-environmental-pollution in the work progress, compares cheap with rudimentary processing method such as prefabricated tubular pile.
Cement mixing pile is applicable to handles mud, mucky soil, silt and the higher grounds such as cohesive soil of water content, after bury and cement paste are forced to mix and stir, the cement decomposition takes place at first; Hydration reaction generates hydrate, and hydrate gluing and particle generation exchange of particles then is because of granulation; And hard reaction with fixed attention, formation has certain intensity and stable soil-cement, thereby improves bearing capacity of foundation soil and change the foundation soil physical and mechanical property; Reach the reinforcing soft ground effect, utilize silty clay, to reach the foundation bearing requirement as bearing course at pile end; Save a large amount of cement, obtained good economic benefit.
The specific embodiment
Below in conjunction with specific embodiment the present invention is done to describe in detail.
Of the present invention coastal Soft Ground cement mixing pile job practices; It may further comprise the steps: (1) whitewashing is sunk: cement paste is poured in the aggregate bin of mortar pump, opened mortar pump, when the shotcrete pipe of mortar pump has slurry to occur; Start the motor of mixer; Make mixer stir sinking while whitewashing along leading truck then, subsidence velocity is controlled at 1.0-1.2m/min, at the submergence depth that marks the drilling tool of installing on the mixer on the boring tower with mark; (2) stir lifting: after mixer sinks to projected depth, stop slurry, the speed stirring lifting with 0.8-1.0m/min for guaranteeing the intensity of pile crown, is stirred to more than the ground; (3) repeating said steps (1) and (2), wherein subsidence velocity is controlled at 1.0-1.3m/min; Stir hoisting velocity and be controlled at 1.2-1.4m/min; (4) repeating said steps (1) and (2) once more, wherein subsidence velocity is controlled at 1.3-1.4m/min, stirs hoisting velocity and is controlled at 0.5-0.8m/min; (5) move the stake machine, carry out the construction of next pile.
The coastal area groundwater table is higher, and seawater has stronger corrosiveness to general cement, the cement paste employing Portland cement in the therefore preferred step (1); Like the 425# Portland cement; The percentage by weight that cement accounts for agitation pile is 15-18%, and it is 8-12% that flyash accounts for the agitation pile percentage by weight, and all the other are soil, water, Admixture; The percentage by weight (water/binder ratio) that water reducing agent, water account for cement is 0.6～0.65.Admixture adopts mixes the water gypsum, and mixing the percentage by weight that the water gypsum accounts for cement is 2-3%, and water reducing agent adopts this quality sulfoacid calcium, and the percentage by weight that water reducing agent accounts for cement is 0.2-0.25%.
This cement mixing pile construction carry out " unified standard for constructional quality " (GB50300-2001), " building lot treatment technology standard " (JGJ79-2002), " Code for design of building " (GB50007-2002), " construction work standard for pile foundation " GB5020-2002, " a building stake machine technology standard " JGJ94-94, " Code for engineering surveying " (GB50026) and each item of design document regulation.
Embodiment 1
Handle to ground, the situation of ground be the face of land to absolute altitude-1.09m be artificial fill stratum, be main with cohesive soil, impurity such as a small amount of organic matter of folder, blinding; Absolute altitude-1.09m ~-1.59m is I Luhe bed river～overbank phase sedimentary deposit, is mainly silty clay, yellowish-brown, and soft north state, the uneven local folder silt thin layer of soil property, the tool rust dyes; Absolute altitude-1.79m ~-16.25m is an I sea shallow-sea facies sedimentary deposit, is mainly silt and silty clay, the grey soil property is uneven, contains a small amount of shell rubble.
Construction: cement paste is poured in the aggregate bin of mortar pump; Open mortar pump; When the shotcrete pipe of mortar pump has slurry to occur, start the motor of mixer, make mixer stir sinking while whitewashing then along leading truck; Subsidence velocity is controlled at 1.1m/min, at the submergence depth that marks the drilling tool of installing on the mixer on the boring tower with mark; Cement paste adopts Portland cement, and like the 425# Portland cement, the percentage by weight that cement accounts for agitation pile is 15%, and the percentage by weight that flyash accounts for agitation pile is 10%, and all the other are soil, water, Admixture, water reducing agent.Wherein to account for the percentage by weight of cement be 0.6 to water.Admixture adopts mixes the water gypsum, and mixing the percentage by weight that the water gypsum accounts for cement is 2%, and water reducing agent adopts this quality sulfoacid calcium, and the percentage by weight that water reducing agent accounts for cement is 0.2%.
(2) stir lifting: after mixer sinks to projected depth, stop slurry, the speed stirring lifting with 0.9m/min for guaranteeing the intensity of pile crown, is stirred to more than the ground; (3) repeating said steps (1) and (2), wherein subsidence velocity is controlled at 1.2m/min; Stir hoisting velocity and be controlled at 1.3m/min; (4) repeating said steps (1) and (2) once more, wherein subsidence velocity is controlled at 1.35m/min, stirs hoisting velocity and is controlled at 0.7m/min; (5) move the stake machine, carry out the construction of next pile.
This method and conventional method effect comparison are following:
Embodiment 2
The face of land to absolute altitude-1.2m be plain fill, be mainly brown and yellowish-brown cohesive soil, contain mica, irony, shell, wet slightly, close slightly; Absolute altitude-1.2 ~-6.7m is riverbed～alluvial flat phase sedimentary deposit, mainly is made up of lam, the part accompanies the weak soil layer.Yellowish-brown, taupe, lark contain mica, irony, organic matter, soft-plastic state; Absolute altitude-6.7 ~-17.23m is that shallow-sea facies deposit the I marine bed, mainly is made up of lam, contains multilayer weak soil interlayer, Dark grey contains mica, organic matter, and shell fragment, soft～stream is moulded state.
Construction: cement paste is poured in the aggregate bin of mortar pump; Open mortar pump; When the shotcrete pipe of mortar pump has slurry to occur, start the motor of mixer, make mixer stir sinking while whitewashing then along leading truck; Subsidence velocity is controlled at 1.2m/min, at the submergence depth that marks the drilling tool of installing on the mixer on the boring tower with mark; Cement paste adopts Portland cement, and like the 425# Portland cement, the percentage by weight that cement accounts for agitation pile is 18%, and the percentage by weight that flyash accounts for agitation pile is 12%, and all the other are soil, water, Admixture, water reducing agent.Wherein to account for the percentage by weight of cement be 0.65 to water.Admixture adopts mixes the water gypsum, and mixing the percentage by weight that the water gypsum accounts for cement is 3%, and water reducing agent adopts this quality sulfoacid calcium, and the percentage by weight that water reducing agent accounts for cement is 0.22%.
(2) stir lifting: after mixer sinks to projected depth, stop slurry, the speed stirring lifting with 1.0m/min for guaranteeing the intensity of pile crown, is stirred to more than the ground; (3) repeating said steps (1) and (2), wherein subsidence velocity is controlled at 1.3m/min; Stir hoisting velocity and be controlled at 1.4m/min; (4) repeating said steps (1) and (2) once more, wherein subsidence velocity is controlled at 1.4m/min, stirs hoisting velocity and is controlled at 0.8m/min; (5) move the stake machine, carry out the construction of next pile.
This method and conventional method effect comparison are following:
Embodiment 3
The face of land to absolute altitude-2.2m be plain fill, be mainly maroon and isabelline opaque cohesive soil, be mingled with the siltstone rubble, be dry and soft diffusing state; Absolute altitude-2.2 ~-5.7m is the pond sediment deposit, and grey black contains organic matter, peat, axis remains, and the part contains the flour sand agglomerate, and the saturated stream that is is moulded state; Absolute altitude-5.7 ~-15.93m is for remaining soil layer, and mainly forming the part by the gravel silty clay is clay, and purplish red, light gray, isabelline contains limestone gravel, dust and rubble, and branch is uneven, has plasticity.
Construction: cement paste is poured in the aggregate bin of mortar pump; Open mortar pump; When the shotcrete pipe of mortar pump has slurry to occur, start the motor of mixer, make mixer stir sinking while whitewashing then along leading truck; Subsidence velocity is controlled at 1.0m/min, at the submergence depth that marks the drilling tool of installing on the mixer on the boring tower with mark; Cement paste adopts Portland cement, and like the 425# Portland cement, the percentage by weight that cement accounts for agitation pile is 17%, and the percentage by weight that flyash accounts for agitation pile is 8%, and all the other are soil, water, Admixture, water reducing agent.Wherein to account for the percentage by weight of cement be 0.62 to water.Admixture adopts mixes the water gypsum, and mixing the percentage by weight that the water gypsum accounts for cement is 2.5%, and water reducing agent adopts this quality sulfoacid calcium, and the percentage by weight that water reducing agent accounts for cement is 0.25%.
(2) stir lifting: after mixer sinks to projected depth, stop slurry, the speed stirring lifting with 0.8m/min for guaranteeing the intensity of pile crown, is stirred to more than the ground; (3) repeating said steps (1) and (2), wherein subsidence velocity is controlled at 1.0m/min; Stir hoisting velocity and be controlled at 1.2m/min; (4) repeating said steps (1) and (2) once more, wherein subsidence velocity is controlled at 1.3m/min, stirs hoisting velocity and is controlled at 0.5m/min; (5) move the stake machine, carry out the construction of next pile.
Claims (2)
1. coastal Soft Ground cement mixing pile job practices is characterized in that it may further comprise the steps:
(1) whitewashing is sunk: cement paste is poured in the aggregate bin of mortar pump; Open mortar pump; When the shotcrete pipe of mortar pump has slurry to occur, start the motor of mixer, make mixer stir sinking while whitewashing then along leading truck; Subsidence velocity is controlled at 1.0-1.2m/min, at the submergence depth that marks the drilling tool of installing on the mixer on the boring tower with mark;
(2) stir lifting: after mixer sinks to projected depth, stop slurry, the speed stirring lifting with 0.8-1.0m/min for guaranteeing the intensity of pile crown, is stirred to more than the ground;
(3) repeating said steps (1) and (2), wherein subsidence velocity is controlled at 1.0-1.3m/min; Stir hoisting velocity and be controlled at 1.2-1.4m/min;
(4) repeating said steps (1) and (2) once more, wherein subsidence velocity is controlled at 1.3-1.4m/min, stirs hoisting velocity and is controlled at 0.5-0.8m/min;
(5) move the stake machine, carry out the construction of next pile.
2. coastal Soft Ground cement mixing pile job practices according to claim 1 is characterized in that: the cement paste in the described step (1) adopts Portland cement, and the percentage by weight that cement accounts for agitation pile is 15-18%; It is 8-12% that flyash accounts for the agitation pile percentage by weight; All the other are soil, water, Admixture, and the percentage by weight that water reducing agent, water account for cement is 0.6～0.65; Admixture adopts mixes the water gypsum; Mixing the percentage by weight that the water gypsum accounts for cement is 2-3%, and water reducing agent adopts this quality sulfoacid calcium, and the percentage by weight that water reducing agent accounts for cement is 0.2-0.25%.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103306278A (en) * | 2013-05-31 | 2013-09-18 | 武汉广益交通科技股份有限公司 | Method for processing soft soil foundation with environment-friendly light pile |
| CN103880374A (en) * | 2014-03-13 | 2014-06-25 | 安徽理工大学 | Novel cement mixing pile made from desulfurized gypsum and polypropylene fiber |
| CN104891893A (en) * | 2015-05-13 | 2015-09-09 | 河海大学 | Coastal soft foundation soil solidifying and reinforcing material and application thereof |
| CN105464077A (en) * | 2015-11-20 | 2016-04-06 | 江苏盛泰智能基础工程有限公司 | Intelligent charging and feeding pile formation operation method of cement soil mixing pile |
| CN106948309A (en) * | 2017-02-21 | 2017-07-14 | 浙江水利水电学院 | It is a kind of applied to sea wall pass the flood period protection in foundation stabilization construction method |
| CN111501742A (en) * | 2020-04-23 | 2020-08-07 | 中核第四研究设计工程有限公司 | Uranium tailing mud curing method |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103306278A (en) * | 2013-05-31 | 2013-09-18 | 武汉广益交通科技股份有限公司 | Method for processing soft soil foundation with environment-friendly light pile |
| CN103880374A (en) * | 2014-03-13 | 2014-06-25 | 安徽理工大学 | Novel cement mixing pile made from desulfurized gypsum and polypropylene fiber |
| CN104891893A (en) * | 2015-05-13 | 2015-09-09 | 河海大学 | Coastal soft foundation soil solidifying and reinforcing material and application thereof |
| CN105464077A (en) * | 2015-11-20 | 2016-04-06 | 江苏盛泰智能基础工程有限公司 | Intelligent charging and feeding pile formation operation method of cement soil mixing pile |
| CN106948309A (en) * | 2017-02-21 | 2017-07-14 | 浙江水利水电学院 | It is a kind of applied to sea wall pass the flood period protection in foundation stabilization construction method |
| CN106948309B (en) * | 2017-02-21 | 2019-09-17 | 浙江水利水电学院 | It is a kind of applied to sea wall pass the flood period protection in foundation stabilization construction method |
| CN111501742A (en) * | 2020-04-23 | 2020-08-07 | 中核第四研究设计工程有限公司 | Uranium tailing mud curing method |
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Application publication date: 20120919 |