CN105000843A - Cement paste for construction of structural steel cement mixing pile and use method of cement paste - Google Patents
Cement paste for construction of structural steel cement mixing pile and use method of cement paste Download PDFInfo
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- CN105000843A CN105000843A CN201510481370.6A CN201510481370A CN105000843A CN 105000843 A CN105000843 A CN 105000843A CN 201510481370 A CN201510481370 A CN 201510481370A CN 105000843 A CN105000843 A CN 105000843A
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- shaped steel
- drill bit
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Abstract
The invention discloses cement paste for construction of a structural steel cement mixing pile and a use method of the cement paste. The problems that in the prior art, when construction of the structural steel cement mixing pile is carried out in a compact sandy soil or gravel soil layer, the piling and well drilling efficiency is low; after existing cement paste is stirred, strength is unstable, and water stability is lowered are mainly solved. The cement paste comprises, by weight, 95 percent to 99 percent of wet cement liquid and one percent to three percent of additive. The wet cement liquid is a mixture of cement and water, and the ratio of the cement to the water is 1:2-11.5. Sandy soil layer or gravel layer bentonite is adopted as the additive. A drill bit comprises a drill bit body, two cutting tooth plates and two harrow teeth. The cutting tooth plates are triangular, one side of each cutting tooth plate is fixedly connected with the drill bit body, and the harrow teeth are arranged on the outer edge of the bottom of the drill bit body. According to the scheme, the piling and well drilling efficiency is improved, the cement paste has more stable strength after being stirred, and the water stability is improved.
Description
Technical field
The present invention relates to a kind of grout of shaped steel cement-soil stirring pile construction, specifically, relate to a kind of grout and using method thereof of shaped steel cement-soil stirring pile construction.
Background technology
Shaped steel cement mixing method (also referred to as the SMW stake) operating technique used in Deep Foundation Pit Supporting Project, be by stake machine after grout and soil are stirred into cement earth pile by underground, insert the continuous body of wall that large rigidity shaped steel is formed, form shaped steel and the common underground support structure of cement earth pile with this, reach the acting in conjunction of supporting and waterproof; When carrying out shaped steel cement-soil stirring pile construction in closely knit sandy soil or gravel soil layer (namely standard value of bearing capacity is more than the soil layer of 200kPa), because the type soil layer supporting capacity is high, be difficult to effectively creep into, therefore piling drilling efficiency is low.
Shaped steel cement mixing method is constructed in closely knit sandy soil or gravel soil layer, use the cement-earth pile that usual grout becomes with soil shear failure, easily make sand or depositing gravel in the bottom of stirring pile body, the resistance causing a machine drill to enter difficulty and shaped steel insertion cement earth pile increases; In addition, and existing grout stir after cement-earth degree of mobilization large, plasticity-is low, and its easy laminated segregation, causes that its intensity is unstable, water stability declines.
Summary of the invention
The problem to be solved in the present invention is when carrying out shaped steel cement-soil stirring pile construction in closely knit sandy soil or gravel soil layer, because the type soil layer supporting capacity is high, is difficult to effectively creep into, therefore piling drilling efficiency is low; Cement-earth degree of mobilization after existing grout stirs is large, plasticity-is low, and its easy laminated segregation, cause its intensity instability, water stability decline.
In order to solve the problem, the invention provides following technical scheme:
A kind of grout of shaped steel cement-soil stirring pile construction comprises the weight percent of following component: cement wets liquid 95% ~ 99%, additive 1% ~ 3%; The described cement liquid that wets is the mixture of cement and water, and its ratio is cement: water=1:2 ~ 11.5; Described additive is sandy soil layer or sandy gravel stratum wilkinite; Preparation method is: wet by cement liquid and additive mix in proportion and get final product.
Particularly, described cement is silicate cement.
Particularly, the drilling rod that shaped steel cement mixing method comprises mudjack, pump line, middle part are provided with grout transfer lime; Mudjack is communicated with the grout transfer lime in the middle part of drilling rod by pump line, and the bottom of drilling rod is connected with drill bit, is provided with nozzle bottom drill bit, and nozzle is communicated with cement pipe.
The using method of the grout of shaped steel cement-soil stirring pile construction comprises the following steps:
A () injects mudjack after being stirred by slurry mixer after being measured by grout again, grout to be delivered in the grout transfer lime in the middle part of drilling rod by pump line by mudjack;
(b) bore under drilling rod piling or promote and stir while grout to be injected into by the synchronous continuous injection of the nozzle bottom drill bit and to stir among the broken soil body;
C the soil body and grout that stir fragmentation stir by () drilling rod Keep agitation, form cement earth pile.
Particularly, rod rotation speed is between 30rod/min ~ 50rod/min, and its running speed is between 0.5m/min ~ 0.8m/min, and its pulling speed is within 1m/min.
Particularly, the grouting amount of nozzle ejection is 70% ~ 80% of the specified grout consumption of slurry mixer, and it is 20% ~ 30% of the specified grout consumption of slurry mixer that drilling rod promotes grouting amount when stirring; The pressure of mudjack is between 0.3Mpa ~ 0.8Mpa.
Particularly, drill bit comprises drill body in step (b), at least one cuts tooth plate, at least one rake teeth, is arranged on nozzle bottom drill body; The one end of cutting tooth plate is fixedly connected with drill body, and one end of rake teeth is connected with the outward flange bottom drill body.
More specifically, the shape of cutting tooth plate is triangular form, and triangular form cuts being fixedly connected with drill body of tooth plate; The shape of cutting tooth plate can be selected according to actual needs.
Compared with prior art, the present invention has following beneficial effect:
(1) in the present invention, the additive of grout is sandy soil layer or sandy gravel stratum wilkinite, wilkinite has certain viscosity, wet after liquid mixes with cement, the flowing property of grout can be promoted, simultaneously due to bentonitic strong adsorptive power, can the material such as water in planar water mud and silicate, make grout have better plasticity-, effectively can prevent the depositing gravel in cement-earth, therefore in the present invention, grout have higher intensity and better sealing performance; In the use procedure of grout, the soil body containing bentonitic grout and cutting fragmentation more easily stirs, the cement-earth after stirring is made to produce good physics, chemical property change, make cement-earth progressively setting and harden, form the shaped steel cement mixing method with workability, water stability and higher-strength and mixedly descend supporting body of wall, reach the effect of underground integer support and waterproof.
(2) intermediate cam type cutting plate of the present invention and rake teeth all with the contact area less more Cutting free soil body of the soil body, make drill bit more Cutting free and pierce in closely knit sandy soil or gravel soil layer, improve the working efficiency of shaped steel cement mixing method, because the operation torque of drill bit more needed for the less therefore drill bit of the Cutting free cutting resistance that makes it be subject to is less.
(3) cement earth pile finally formed by the grout in the present invention has higher intensity, and when making the cement earth pile of same intensity, the steel that this type of cement earth pile needs is less, therefore the cost that use the present invention makes cement earth pile is lower.
(4) in the present invention, grout in use can not produce objectionable impurities, environmentally safe.
Accompanying drawing explanation
Fig. 1 is the structural representation of drill bit.
In above-mentioned accompanying drawing, the component names that Reference numeral is corresponding is as follows:
1-drill bit cylinder, 2-cuts tooth plate, 3-rake teeth, 4-nozzle.
Embodiment
Below in conjunction with drawings and Examples, the invention will be further described, and embodiments of the present invention include but not limited to the following example.
Embodiment
The grout of shaped steel cement-soil stirring pile construction comprises the weight percent of following component: cement wets liquid 95% ~ 99%, additive 1% ~ 3%; The described cement liquid that wets is the mixture of cement and water, and its ratio is cement: water=1:2 ~ 11.5; Described additive is sandy soil layer or sandy gravel stratum wilkinite; Preparation method is: wet by cement liquid and additive mix in proportion and get final product, and mixing time is at least 30s, just can make wilkinite and cement wet liquid mixing evenly; Cement is silicate cement.
Mix bentonitic grout batching and Stock allotment right control table
Can find out from upper table, additive is sandy soil layer or sandy gravel stratum wilkinite, wilkinite has certain viscosity, wet after liquid mixes with cement, the flowing property of grout can be promoted, simultaneously due to bentonitic strong adsorptive power, can the material such as water and silicate in planar water mud, make grout have better plasticity-, effectively can prevent the depositing gravel in cement-earth, therefore in the present invention, grout has higher intensity and better sealing performance; In the use procedure of grout, the soil body containing bentonitic grout and cutting fragmentation more easily stirs, the cement-earth after stirring is made to produce good physics, chemical property change, make cement-earth progressively setting and harden, form the shaped steel cement mixing method with workability, water stability and higher-strength and mixedly descend supporting body of wall, reach the effect of underground integer support and waterproof.
The drilling rod that shaped steel cement mixing method comprises mudjack, pump line, middle part are provided with grout transfer lime; Mudjack is communicated with the grout transfer lime in the middle part of drilling rod by pump line, and the bottom of drilling rod is connected with drill bit, is provided with nozzle bottom drill bit, and nozzle is communicated with cement pipe;
The using method of the grout of shaped steel cement-soil stirring pile construction comprises the following steps:
1.1 grout is measured after stirred by slurry mixer again after inject mudjack, grout to be delivered in the grout transfer lime in the middle part of drilling rod by pump line by mudjack;
1.2 bore under drilling rod piling or promote stir while grout to be injected into by the synchronous continuous injection of the nozzle bottom drill bit and to stir among the broken soil body;
The soil body and grout that stir fragmentation stir by 1.3 drilling rod Keep agitation, form cement earth pile.
The use of grout is then completed after completing steps 1.1-1.3.
Wherein, rod rotation speed is between 30rod/min ~ 50rod/min, and its running speed is between 0.5m/min ~ 0.8m/min, and its pulling speed is within 1m/min; Concrete rod rotation speed, running speed, pulling speed is determined according to particular type steel cement mixing method and soil layer during actually operating.
The grouting amount of nozzle ejection is 70% ~ 80% of the specified grout consumption of slurry mixer, and it is 20% ~ 30% of the specified grout consumption of slurry mixer that drilling rod promotes grouting amount when stirring; The pressure of mudjack is between 0.3Mpa ~ 0.8Mpa; Concrete grouting amount and the pressure of mudjack is determined according to particular type steel cement mixing method and soil layer during actually operating.
As shown in Figure 1, drill bit comprises drill body 1, two and cuts tooth plate 2, two rake teeths 3, is arranged on nozzle 4 bottom drill body; Cutting the shape of tooth plate 2 is triangular form, and triangular form cuts being fixedly connected with drill body 1 of tooth plate 2, makes drill bit be vertebra shape with the angle that triangular form cuts this limit of tooth plate 2 relative near the medullary ray of drill body 1; One end of rake teeth 3 is connected with the outward flange bottom drill body 1.
Wherein, the quantity of cutting tooth plate 2 and rake teeth 3 is selected according to practical situation; The shape of cutting tooth plate 2 also can be selected according to thing situation.
According to above-described embodiment, just the present invention can be realized well.What deserves to be explained is; under prerequisite based on said structure design, for solving same technical problem, even if some making on the invention are without substantial change or polishing; the essence of the technical scheme adopted is still the same with the present invention, therefore it also should in protection scope of the present invention.
Claims (7)
1. a grout for shaped steel cement-soil stirring pile construction, is characterized in that, comprises the weight percent of following component: cement wets liquid 95% ~ 99%, additive 1% ~ 3%; The described cement liquid that wets is the mixture of cement and water, and its ratio is cement: water=1:2 ~ 11.5; Described additive is sandy soil layer or sandy gravel stratum wilkinite; Preparation method is: wet by cement liquid and additive mix in proportion and get final product.
2. the grout of shaped steel cement-soil stirring pile construction according to claim 1, is characterized in that, described cement is silicate cement.
3. the using method of the grout of the shaped steel cement-soil stirring pile construction according to any one of claim 1 ~ 2, is characterized in that, the drilling rod that shaped steel cement mixing method comprises mudjack, pump line, middle part are provided with grout transfer lime; Mudjack is communicated with the grout transfer lime in the middle part of drilling rod by pump line, and the bottom of drilling rod is connected with drill bit, is provided with nozzle bottom drill bit, and nozzle is communicated with cement pipe;
This using method comprises the following steps:
A () injects mudjack after being stirred by slurry mixer after being measured by grout again, grout to be delivered in the grout transfer lime in the middle part of drilling rod by pump line by mudjack;
(b) bore under drilling rod piling or promote and stir while grout to be injected into by the synchronous continuous injection of the nozzle bottom drill bit and to stir among the broken soil body;
C the soil body and grout that stir fragmentation stir by () drilling rod Keep agitation, form cement earth pile.
4. the using method of the grout of shaped steel cement-soil stirring pile construction according to claim 3, it is characterized in that, rod rotation speed is between 30rod/min ~ 50rod/min, and its running speed is between 0.5m/min ~ 0.8m/min, and its pulling speed is within 1m/min.
5. the using method of the grout of shaped steel cement-soil stirring pile construction according to claim 4, it is characterized in that, the grouting amount of nozzle ejection is 70% ~ 80% of the specified grout consumption of slurry mixer, and it is 20% ~ 30% of the specified grout consumption of slurry mixer that drilling rod promotes grouting amount when stirring; The pressure of mudjack is between 0.3Mpa ~ 0.8Mpa.
6. the using method of the grout of shaped steel cement-soil stirring pile construction according to claim 5, it is characterized in that, drill bit comprises drill body (1) in step (b), at least one cuts tooth plate (2), at least one rake teeth (3), is arranged on the nozzle (4) of drill body (1) bottom; The one end of cutting tooth plate (2) is fixedly connected with drill body, and one end of rake teeth (3) is connected with the outward flange of drill body (1) bottom.
7. the using method of the grout of shaped steel cement-soil stirring pile construction according to claim 6, it is characterized in that, the shape of cutting tooth plate (2) is triangular form, and triangular form cuts being fixedly connected with drill body of tooth plate (2).
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| CN201510481370.6A CN105000843A (en) | 2015-08-03 | 2015-08-03 | Cement paste for construction of structural steel cement mixing pile and use method of cement paste |
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| CN201510481370.6A CN105000843A (en) | 2015-08-03 | 2015-08-03 | Cement paste for construction of structural steel cement mixing pile and use method of cement paste |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112282767A (en) * | 2020-10-21 | 2021-01-29 | 江苏旭辰交通科技发展有限公司 | Ultra-deep reinforcement construction method for shield end soil body under water-rich silty-fine sand geology |
| CN114716195A (en) * | 2022-05-13 | 2022-07-08 | 中基发展建设工程有限责任公司 | Cement slurry, cement soil mixing pile and application |
-
2015
- 2015-08-03 CN CN201510481370.6A patent/CN105000843A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112282767A (en) * | 2020-10-21 | 2021-01-29 | 江苏旭辰交通科技发展有限公司 | Ultra-deep reinforcement construction method for shield end soil body under water-rich silty-fine sand geology |
| CN114716195A (en) * | 2022-05-13 | 2022-07-08 | 中基发展建设工程有限责任公司 | Cement slurry, cement soil mixing pile and application |
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Application publication date: 20151028 |