CN101775803A

CN101775803A - Mushroom-shaped mixed composite pile capable of effectively controlling settlement and construction method

Info

Publication number: CN101775803A
Application number: CN200910046400A
Authority: CN
Inventors: 刘全林; 宋伟民
Original assignee: Shanghai Qiangjin Foundation Engineering Co Ltd
Current assignee: Shanghai Qiangjin Foundation Engineering Co Ltd
Priority date: 2009-02-20
Filing date: 2009-02-20
Publication date: 2010-07-14

Abstract

The invention relates to a mushroom-shaped mixed composite pile capable of effectively controlling settlement and a construction method. The invention relates to a technique for treating soft geologies in geotechnical engineering, the pile not only solves the defects of the commonly used prior foundation treatment technique, including the low strength of the mixed pile body and the severe compression deformation of the pile body, but also can effectively control post-construction settlement and increase the pressure diffusion angle, and the invention is an economic novel foundation treatment technique. A special-purposed reducing single-shaft mixing pile driver is adopted to shape a mushroom-shaped single-shaft deep-mixed cement-soil pile body, and a precast concrete pile, or a steel pipe or a bamboo-wood material as a core material is inserted in the center of the pile body to form the novel composite pile which consists of a mushroom-shaped cement-soil mixed pile and a high-strength core pile.

Description

A kind of mushroom-shaped mixed composite pile capable of effective control sedimentation and job practices

One, technical field

The present invention relates in the geotechnical engineering the weak geographical reinforcing technique of handling, form the combination pile body by insert high-strength core at mushroom-shaped cement mixing method body, will improve the pile strength of compound pile body greatly, improve the pressure angle of flare, can effectively control foundation settlement, reduce construction costs.

Two, technical background

In the engineering construction in China area such as coastal, riverine, ubiquity foundation soil weakness, poor stability, the characteristics that bearing capacity is on the low side especially in the very fast area of economic development, are used for the expense that ground is handled, and will have more than hundred billion yuan every year.At present, in China's foundation treatment engineering, the technology of employing mainly contains: foundation treatment technologies such as vibroroller cmpacting, preloading draining, cement mixing method or high-pressure rotary jet grouting pile.These treatment technologies are difficult to defectives such as control owing to exist posterior settlement, in that the higher ground of requirement of settlement control is handled the place, often are subjected to using restriction.Deep-mixed pile body itself usually is difficult to satisfy the requirement of bearing capacity because intensity is lower, and high-pressure rotary jet grouting pile will make construction cost significantly improve because cement consumption is higher.

In view of above-mentioned treatment technology uses defectives such as the construction effect of existence is difficult to control, pile strength is lower respectively, through engineering practice research for many years, we have invented a kind of new foundation treatment technology---a kind of mushroom-shaped mixed composite pile capable and job practices of effective control sedimentation, this type has not only overcome all deficiencies of foundation treatment technology at present commonly used, and be a kind of settlement after construction, raising pressure angle of flare, Jing Ji novel foundation treatment technology again both effectively controlled.

Three, summary of the invention

A kind of mixed composite pile capable of effective control sedimentation and job practices are to stir the cement earth pile center deeply at mushroom-shaped single shaft to insert precast concrete square pile, or steel pipe, or a kind of NEW TYPE OF COMPOSITE stake of forming as core of reinforcing bar or bamboo and wood materials, it is made up of the very high core stake two parts of mushroom-shaped cement mixing method and intensity, as shown in Figure 1.

Use the single shaft mixing pile machine, at first the soil body and cement grout mix are formed cement-soil, insert the pile body that (or several) core (precast concrete square pile, or steel pipe, or reinforcing bar or bamboo and wood materials etc.) is composited by vibration then.The composite pile of Xing Chenging has higher pile strength and rigidity like this, can satisfy different carryings and Deformation control requirement.By effective combination of deep layer stirring concrete earth pile and core stake, the composite pile of formation, its bearing capacity improves 30% than core pile capacity, and comprehensive cost reduces more than 30%.

Concrete characteristics are as follows:

(1) bearing capacity height:, increased the vertical bearing capacity of agitation pile greatly by inserting effective combination of core stake in the cement mixing method;

(2) improved the pressure angle of flare: by mushroom-shaped agitation pile shape,

(3) construction costs is low: with compare with other type of bearing capacity, construction costs reduces more than 40%;

(4) suitable stratum is extensive: mud, silt clay, clay, silt, flour sand layer etc.;

(5) pile quality is easy to control: the core system easy to control the quality of inserting agitation pile;

(6) reinforcing soft ground: can be used as the enhancing body of composite foundation, mud, mucky soil etc. is carried out ground stabilization;

(7) the control settlement after construction is effective: can make the curtain water stop soldier pile, overcome stir deeply can only sealing can not supporting deficiency;

(8) economic environmental protection: noise is little, pollution-free, economic environmental protection.

Four, description of drawings (body matter)

The sectional drawing of Fig. 1 mushroom-shaped mixed composite pile capable

The plan view of Fig. 2 mushroom-shaped mixed composite pile capable

The deep layer stirring concrete earth pile at the mushroom-shaped top of 1-; The deep layer stirring concrete earth pile of the mushroom-shaped bottom of 2-; 3-rigidity core (precast concrete square pile, or steel pipe or bamboo and wood materials)

Five, the specific embodiment

(1), at first use single shaft reducing mixing pile machine, the soil body and cement grout mix are formed mushroom-shaped cement mixing method body

(2), insert the pile body that (or several) core (precast concrete square pile, or steel pipe, or reinforcing bar or bamboo and wood materials) is composited by vibration or deadweight then.

(3), the core of Jia Ruing will guarantee that in the center of mushroom-shaped cement mixing method body promptly the core center of Cha Ruing should overlap with the center of agitation pile.

Claims

One kind effectively the mushroom-shaped mixed composite pile capable of control sedimentation and job practices are the pile body that a kind of mushroom-shaped cement mixing method and rigidity core are combined into and the foundation treatment technology of construction molding.
2. composite pile structure according to claim 1 is characterized in that its mushroom-shaped cement mixing method is made up of the small-diameter soil-cement agitation pile of top major diameter cement mixing method and bottom.
3. composite pile structure according to claim 1 is characterized in that the core that inserts in the mushroom-shaped cement mixing method is by precast concrete pile, or compositions such as steel pipe or bamboo and wood materials.
4. according to claim 1,2,3 described job practicess, it is characterized in that mushroom-shaped agitation pile adopts special-purpose reducing single shaft mixing pile machine construction to form, insert the rigidity core in the center of mushroom-shaped agitation pile, the insertion method sinks to for vibration or conducts oneself with dignity and sink to.