CN102433876A - Multi-compartment casing composite pile and construction method thereof - Google Patents

Multi-compartment casing composite pile and construction method thereof Download PDF

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Publication number
CN102433876A
CN102433876A CN2011102539728A CN201110253972A CN102433876A CN 102433876 A CN102433876 A CN 102433876A CN 2011102539728 A CN2011102539728 A CN 2011102539728A CN 201110253972 A CN201110253972 A CN 201110253972A CN 102433876 A CN102433876 A CN 102433876A
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pile body
sleeve pipe
pile
many compartments
flexible
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CN2011102539728A
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CN102433876B (en
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王新泉
陈永辉
陈龙
陈庚
张俊
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Hwaking Construction Group Co ltd
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Zhejiang University City College ZUCC
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Publication of CN102433876B publication Critical patent/CN102433876B/en
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Abstract

The invention relates to a multi-compartment casing composite pile and a construction method thereof. The composite pile comprises a multi-compartment casing, wherein the bottom of the casing is connected with a precast pile tip; gravels, construction wastes or crushed stones are filled into partial compartments of the casing to form a flexible pile body; water draining holes are uniformly formed on the periphery of the flexible pile body; a vertical slurry injection pipe is embedded in the flexible pile body of which the top is sealed; gravels or fine aggregate concrete are filled into partial compartments to form a rigid pile body; and the top of the rigid pile body is inserted with a pile top reinforcing steel bar and is cast with a cover plate after being connected with a cover plate reinforcing bar. The multi-compartment casing is through in a radial direction; the top of the cover plate is laid with a reinforcement cushion layer and placed with a horizontal slurry injection pipe; and the horizontal slurry injection pipe is communicated to a dam slope foot as a water draining filter pipe after being connected with a vertical slurry injection pipe. Cement slurry can be injected into the flexible pile body through the slurry injection pipes according to total settlement, settlement rate, predicated post-construction settlement and consolidation degree of foundation soil mass, so that the bulk material slurry consolidates to convert the flexible pile body into the rigid pile body so as to realize dynamic design and dynamic construction.

Description

Many compartments sleeve pipe composite pile and job practices thereof
Technical field
The present invention relates to the method for processing foundation of a kind of discrete material pile and rigid pile consubstantiality combination, particularly a kind of many compartments sleeve pipe composite pile and job practices thereof.
Background technology
Before the present technique invention, its Soft Ground measure mainly contains two big types in the dam constructions such as various roadbeds, and one type is consolidation, and another kind of is compound foundation method.
Consolidation is commonly used has vacuum method, preloading and vacuum preloading joint preloading method, and drainage channel commonly used has discrete material piles such as plastic draining board, sand wick, broken stone pile or sand-gravel pile.The cost aspect generally is that the sand wick of plastic draining board and minor diameter is minimum, and discrete material pile is higher.The purpose of consolidation mainly contains two: the one, and make being deposited in of ground load most of or basic completion the during the precompressed; Make building between the operating period after the operation, produce as far as possible little sedimentation; Promptly reduce settlement after construction; Be exactly the discharging consolidation that quickens the ground weak soil through the existence of drainage channel in addition; The intensity of weak soil is increased fast, thereby improve the bearing capacity and the stability of ground, make roadbed or dykes and dams the unstability slump can not occur owing to foundation soil strength is not enough at loading duration.Its advantage is to reinforce cost, and job practices is simple, therefore in actual engineering, preferentially selects for use, uses quite extensive.But it is long in time limit that its shortcoming is; Need sufficient precompressed and discharging consolidation time; Particularly in deep soft foundation engineering, need the very long precompressed phase; And the intrinsic caused settlement after construction problem of secondary consolidation reason of soft foundation itself generally is difficult to adopt this draining preloading method to solve, even therefore its consolidation effect is being arranged under the situation of abundant time generally also not as treatment process of composite foundation.In addition; Because present existing design theory can't accurately be estimated the needed precompressed phase of actual engineering; Theoretical Calculation and actual consolidation settlement situation difference more or less exist, and difference is very big sometimes, often need while constructing according to the actual consolidation settlement situation adjustment precompressed phase; The duration that is whole engineering can't accurately be estimated in advance, can produce probabilistic influence to the duration of engineering.
The composite foundation method is to be employed in the mode that sets various stakes in the soft foundation in a large number to form composite foundation, to reduce foundation settlement.Adopt the rigid pile composite foundation of circular single hole sleeve pipe retaining wall in engineering, to be used at present; Like the single wall screw plastic casing concrete pile; Also have the scholar to propose the theory that plastic honeycomb is managed and protected the special-shaped castinplace pile of wall, one of defective that such type exists at present is for adopting expansion stake point and the immersed tube greater than the pile body size, if all soil of stake can not in time return crowded; Plastic bushing sets that the reaming effect has weaken effect to pile side friction in the process, and pile body bearing capacity has significantly ageing.The composite foundation method particularly the method for rigid pile composite foundation to have a consolidation effect good, the sedimentation convergence is fast, the duration is short; Can effectively control settlement after construction; Advantages such as the processing degree of depth is dark, and quality is prone to assurance, and consolidation effect is good; It is very high that but its shortcoming is cost, be higher than various discharging consolidation methods far away.Be difficult to as for deep soft foundation on the relative hardpan or ultra-soft soil for the stake end simultaneously, also have the long partially or excessive shortcoming of settlement after construction of precompressed phase.
Treatment of soft foundation under the dykes and dams load at present, generally adopt single method for processing foundation: or discharging consolidation method, or the composite foundation method.Give full play to the characteristics of two class methods, the method with consolidation and compound foundation method combination use occurs at present, combines (being called 2D worker's method) if any band drain and powder spray piling; Method, band cap PTC type perforated pipe pile composite foundation method, pile tube and the plastic draining board that uses permeable concrete pipe piles to carry out the ground processing sets the method for formation composite foundation etc. at interval.
The method that consolidation and compound foundation method combination at present used can be summarized as two types: the one, and water discharging body and firm (softening) property stake intersect the method that sets reinforcing flexible foundation, and another kind of is the method for employing pervious concrete or perforate on the rigidity pile body.The 1st class methods are needed two kinds of treatment of soft foundation equipment coordinative constructions, and the construction quality of water discharging body and rigid and flexible pile exists phase mutual interference and influence, and speed of application is slow, and the duration is longer.The 2nd class methods pervious concrete exists hole blockage problem and drainage effect limited, the prefabricated comparatively difficulty of porose pile tube, and set and requirements on transport for satisfying, strength of the mixing pile and arrangement of reinforcement require high more a lot than common pile for prestressed pipe, cause disposal cost higher.The common problem that two class methods exist is to finish or the operation phase in the precompressed phase, and water discharging body is still playing a role, and water discharging body quickens the effect of soil body discharging consolidation, has become unfavorable factor in this stage to reducing settlement after construction.
In sum; According to present actual conditions and technical condition; Needing that invention is a kind of badly can rational and balanced between duration, construction investment, workmanship; Give full play to the characteristics of consolidation and compound foundation method, its combination used, and again can be in implementation process can dynamic design to foundation reinforcement method and a kind of novel foundation treatment mode of Dynamic Construction according to the actual needs of duration or precompressed effect.
Summary of the invention
The characteristics that the objective of the invention is to combined water drain concretion method and compound foundation method are improved the defective of the not enough and existence of technology at present, realize that consolidation combines with the effective of composite foundation technology, realize dynamic design and Dynamic Construction.
In order to realize above-mentioned purpose, following technical scheme has been adopted in invention:
Many compartments sleeve pipe composite pile; Comprise many compartments sleeve pipe, the bottom of sleeve pipe connects precast pile tip, pours into gravel, building waste or rubble in the part compartment of sleeve pipe and forms flexible pile body; Pour into mortar or pea gravel concreten in the part compartment and form the rigidity pile body, flexible pile body and the combination of rigidity pile body consubstantiality;
Wherein, pre-buried vertical Grouting Pipe in the flexible pile body, periphery evenly is provided with drain hole, and vertical Grouting Pipe is by passing the top seal of this pile body in the pile body cover plate;
The top of rigidity pile body plugs a top reinforcing bar, the cover plate arrangement of reinforcement is set after, connect before stake top reinforcing bar and cover plate arrangement of reinforcement connect, pour into a mould cover plate;
Described many compartments sleeve pipe radially connects,, reinforcement cushion is laid at the cover plate top; And lay the horizontal grouting pipe; Vertical Grouting Pipe in horizontal grouting pipe and the flexible pile body is connected, and the horizontal grouting pipe causes dykes and dams toe place, and the horizontal grouting pipe uses as the draining chimney filter during the draining precompressed.
Aforesaid many compartments sleeve pipe composite pile is characterized in that, many compartments outside of sleeve coats the water permeability geotextile; Vertical Grouting Pipe pre-buried in the flexible pile body is buried underground or long the burying underground of part stake along the full stake of many compartments sleeve pipe is long.
Aforesaid many compartments sleeve pipe composite pile is characterized in that described many compartments sleeve pipe is single wall or double-walled, and material is PVC, PE or HDPE.
Aforesaid many compartments sleeve pipe composite pile is characterized in that described many compartments sleeve pipe is a pipe, and described rigidity pile body and flexible pile body arrange that along the circle spacing middle part compartment is arranged to rigidity pile body or flexible pile body.
Aforesaid many compartments sleeve pipe composite pile is characterized in that described many compartments sleeve pipe is a square tube, and the rigidity pile body is arranged on the diagonal, four jiaos of placement of flexible pile bodies; Perhaps the rigidity pile body is arranged in inside, and flexible pile body is arranged along periphery; Perhaps the rigidity pile body is " ten " word and is arranged on the axis four jiaos of placement of flexible pile bodies.The job practices of many compartments sleeve pipe composite pile is characterized in that, comprises the steps:
(1) adopts joint that many compartments sleeve pipe is connected based on designing pile length, and be connected with precast pile tip;
(2) according to the precast pile tip size, outsourcing geotextile bag around sleeve pipe;
(3) under the traction of lifting rope, many compartments sleeve pipe is put into immersed tube from the immersed tube bottom, adopt the pipeline sinking pile machine, the auxiliary vibration of static pressure is squeezed in the ground;
(4) treat certain regional many compartments sleeve pipe concentrate set finish after; After in the part compartment, laying vertical Grouting Pipe, pour into gravel, building waste or rubble, and take fixation to make vertical Grouting Pipe be positioned at the center of compartment; And this compartment closedtop closed, form flexible pile body;
(5) lay cover plate template or excavation clay model according to the cover plate design size;
(6) in the part compartment of many compartments sleeve pipe, pour into pea gravel concreten or mortar based on designing requirement, irritate to the stake top, plug a top reinforcing bar, form the rigidity pile body;
(7) lay the cover plate arrangement of reinforcement, the cast cover plate;
(8) treat that pile body and cover plate intensity are up to standard after, lay reinforcement cushion, lay the horizontal grouting pipe, the horizontal grouting pipe is connected with the interior vertical Grouting Pipe of flexible pile body, and the horizontal grouting pipe is caused dykes and dams toe place;
(9) carry out that dykes and dams fill and precompressed, fill at dykes and dams that vertical Grouting Pipe, horizontal grouting pipe use as the draining chimney filter in the process, can adopt submersible pump or vacuum pump to draw water;
(10) based on the dykes and dams rate of settling, during the precompressed phase finishes back or operation, in flexible pile body, inject cement grout through vertical Grouting Pipe, horizontal grouting pipe, the discrete material slurry in the flexible pile body becomes the rigidity pile body admittedly.The job practices of aforesaid many compartments sleeve pipe composite pile is characterized in that many compartments outside of sleeve coats the water permeability geotextile, and the slurries that step (10) is injected diffuse to and form cement-soil in the outsourcing geotextile bag.
The job practices of aforesaid many compartments sleeve pipe composite pile is characterized in that described many compartments sleeve pipe is single wall or double-walled pipe or square tube, and material is PVC, PE or HDPE; Grouting Pipe pre-buried in the flexible pile body is buried underground or long the burying underground of part stake along the full stake of sleeve pipe is long.
Aforesaid many compartments sleeve pipe composite pile is characterized in that described many compartments sleeve pipe is a pipe, and described rigidity pile body and flexible pile body arrange that along the circle spacing middle part compartment is arranged to rigidity pile body or flexible pile body; Perhaps described many compartments sleeve pipe is a square tube, and the rigidity pile body is arranged on the diagonal, four jiaos of placement of flexible pile bodies; Perhaps the rigidity pile body is arranged in inside, and flexible pile body is arranged along periphery; Perhaps the rigidity pile body is " ten " word and is arranged on the axis four jiaos of placement of flexible pile bodies.
The job practices of aforesaid many compartments sleeve pipe composite pile is characterized in that in bed course, laying air-locked closing membrane to combine with vacuum preloading.
Description of drawings
The generalized section of many compartments of Fig. 1 the present invention sleeve pipe composite pile;
Fig. 2 is the stereogram of square many compartments sleeve pipe;
Fig. 3 is the cross-sectional view of square many compartments sleeve pipe;
Fig. 4 is the stereogram of circular many compartments sleeve pipe;
Fig. 5 is the cross-sectional view of circular many compartments sleeve pipe;
Many compartments of Fig. 6 the present invention sleeve pipe composite pile construction technology sketch map;
Fig. 7 is that the horizontal grouting pipe is arranged sketch map in the bed course;
Fig. 8 is many compartments sleeve pipe composite pile dykes and dams sketch mapes.
Among the figure: but many compartments of 1-sleeve pipe, the vertical Grouting Pipe of 2-, 3-flexibility draining pile body, 4-rigidity pile body, 5-stake tip cutting muscle, 6-geotextile bag, 7-cement-soil, 8-cover plate arrangement of reinforcement, 9-cover plate, 10-precast pile tip, the perforate of many compartments of 11-sleeve pipe hole wall, 12-casing joint, 13-immersed tube, 14-lifting rope, 15-horizontal grouting pipe, 16-reinforcement cushion, 17-dykes and dams.
The practical implementation instance
The generalized section of many compartments of Fig. 1 sleeve pipe composite pile, with reference to shown in Figure 1, many compartments sleeve pipe composite pile comprises that the many compartments sleeve pipe 1 that radially connects, the bottom of sleeve pipe connect precast pile tip 10.But pour into gravel, building waste or rubble in the part compartment of sleeve pipe and form discrete material flexibility draining pile body 3; But pre-buried vertical Grouting Pipe 2 in the flexibility draining pile body 3; By passing in the pile body cover plate; And with the top seal of sleeve pipe, the pipe Zhou Kaikong of vertical Grouting Pipe 2, and vertical Grouting Pipe 2 long bury underground also of stake can part long burying underground entirely; Pour into mortar or pea gravel concreten in the part compartment and form rigidity pile body 4, the top of rigidity pile body 4 plugs a top reinforcing bar 5, and is provided with cover plate 9, and cover plate 9 is provided with cover plate arrangement of reinforcement 8, but flexibility draining pile body 3 and the combination of rigidity pile body 4 consubstantialities; Reinforcement cushion 16 is laid at the cover plate top of many compartments sleeve pipe composite pile, lays horizontal grouting pipe 15, but horizontal grouting pipe 15 be connected with the vertical Grouting Pipe 2 of flexibility draining pile body 3, and horizontal grouting pipe 15 causes dykes and dams 17 toe places.
Fig. 2 is the stereogram of square many compartments sleeve pipe, and Fig. 3 is the cross-sectional view of square many compartments sleeve pipe, and Fig. 4 is the stereogram of circular many compartments sleeve pipe, and Fig. 5 is the cross-sectional view of circular many compartments sleeve pipe.To shown in Figure 5, many compartments sleeve pipe 1 can adopt single wall or double-walled pipe or square tube with reference to Fig. 2, and its material can adopt PVC, PE, HDPE.For square casing, the rigidity pile body can be " ten " word and be arranged on the axis, and four jiaos of placement of flexible pile bodies perhaps can be arranged in rigidity pile body 4 on the diagonal, but four jiaos of placement of flexible draining pile bodies 3; For circular casing, but can be with rigidity pile body 4, flexibility draining pile body 3 separation, and rigidity pile body 4 or flexible pile body are arranged in the middle part, but only are used in the accompanying drawing explaining, and non-limiting, on the whole, flexible pile body are arranged in the periphery of sleeve pipe as far as possible.But the periphery of the flexibility draining pile body 3 of many compartments sleeve pipe 1 evenly is provided with a plurality of drain holes 11, and outside pipe, coats the water permeability geotextile, and geotextile bag 6 sizes of formation are slightly larger than the size of precast pile tip 10.
Many compartments of Fig. 6 sleeve pipe composite pile construction technology sketch map, with reference to shown in Figure 6, the job practices of many compartments sleeve pipe composite pile comprises the steps:
(1) according to designing pile length, adopt casing joint 12 that many compartments sleeve pipe 1 is connected, and be connected with precast pile tip 10, many compartments sleeve pipe 1 adopts 9 hole PVC square grid pipes, wall thickness 2.5mm, endoporus 80 * 80mm, thickness are 25cm; Precast pile tip 10 adopts diameter 33cm circular steel reinforced concrete precast pile tip, adopts the C30 concrete pouring to form; It is 30cm that square immersed tube adopts the outer length of side, is welded clean length of side 27.6cm in the square immersed tube for the 1.2cm steel plate by thickness;
(2) according to precast pile tip 10 sizes, outsourcing geotextile bag 6 around many compartments sleeve pipe 1, the diameter of geotextile cloth bag 6 is 33cm;
(3) under the traction of lifting rope 14, many compartments sleeve pipe 1 is put into immersed tube 13 from immersed tube 13 bottoms, adopt common pipeline sinking pile machine, the auxiliary vibration of static pressure is squeezed in the ground; Set at the bottom of the stake and after the design elevation, extract immersed tube 13, many compartments sleeve pipe 1 is stayed in the ground;
(4) treat certain regional many compartments sleeve pipe 1 concentrate set finish after; In the part compartment, lay vertical Grouting Pipe 2; But pour into sand, building waste or rubble then and become flexibility draining pile body 3; Take fixation to make vertical Grouting Pipe be positioned at the center of compartment, vertical Grouting Pipe 2 surpasses the high 5cm of cover plate 9 top marks, and this compartment top is sealed with the PVC vinyl cover.Vertical Grouting Pipe 2 is pvc pipes of diameter 2cm, and the evenly perforate of pipe week in the two ends and the centre position of pvc pipe, is evenly arranged the centring ring that is slightly less than the hole of burying underground according to the design length of embedment;
(5) lay cover plate template or excavation clay model according to cover plate 9 design sizes;
(6) in sleeve pipe 1 part compartment, pour into pea gravel concreten or mortar formation rigidity pile body 4 according to designing requirement, irritate to the top, plug a top reinforcing bar 5;
(7) lay cover plate arrangement of reinforcement 8, and, pour into a mould cover plate 9 with after stake tip cutting muscle 5 is connected;
(8) Fig. 7 is that the horizontal grouting pipe is arranged sketch map in the bed course; With reference to shown in Figure 7, treat that pile body and cover plate reach certain intensity after, lay horizontal grouting pipe 15; And be connected with vertical Grouting Pipe 2 in imbedding many compartments sleeve pipe, horizontal grouting pipe 15 is caused dykes and dams 17 toe places;
(9) Fig. 8 is many compartments sleeve pipe composite pile dykes and dams sketch mapes; After laying reinforcement cushion 16; Carry out dykes and dams 17 and fill and precompressed, fill vertical Grouting Pipe 2 in the process, horizontal grouting pipe 15 as the use of draining chimney filter, can adopt submersible pump or vacuum pump to draw water at dykes and dams 17; If need to combine, in bed course, lay air-locked closing membrane with vacuum preloading;
(10) get into the degree of consolidation of total settlement, the rate of settling, prediction settlement after construction and foundation soil body after precompressed after date or the operation according to dykes and dams; Discrete material pile body in the compartment sleeve pipe is carried out the slip casting design; Confirm slurries index and grouting pile number; But in discrete material flexibility draining pile body, inject cement paste with horizontal grouting pipe 15 through vertical Grouting Pipe 2, the discrete material slurry becomes the rigidity pile body admittedly, and slurries diffuse to and form cement-soil 7 in many compartments sleeve pipe outsourcing geotextile bag simultaneously.

Claims (10)

1. many compartments sleeve pipe composite pile; The bottom that comprises many compartments sleeve pipe, sleeve pipe connects precast pile tip; Pour into gravel, building waste or rubble in the part compartment of sleeve pipe and form flexible pile body; Pour into mortar or pea gravel concreten in the part compartment and form the rigidity pile body, flexible pile body and the combination of rigidity pile body consubstantiality;
Wherein, pre-buried vertical Grouting Pipe in the flexible pile body, periphery evenly is provided with drain hole, and vertical Grouting Pipe is by passing the top seal of this pile body in the pile body cover plate;
The top of rigidity pile body plugs a top reinforcing bar, the cover plate arrangement of reinforcement is set after, a stake top reinforcing bar is connected with the cover plate arrangement of reinforcement, pours into a mould cover plate;
Described many compartments sleeve pipe radially connects; Reinforcement cushion is laid at the cover plate top, and lays the horizontal grouting pipe, and the horizontal grouting pipe is connected with the interior vertical Grouting Pipe of flexible pile body; And the horizontal grouting pipe causes dykes and dams toe place, and the horizontal grouting pipe uses as the draining chimney filter during the draining precompressed.
2. many compartments sleeve pipe composite pile according to claim 1 is characterized in that, many compartments outside of sleeve coats the water permeability geotextile; Vertical Grouting Pipe pre-buried in the flexible pile body is buried underground or long the burying underground of part stake along the full stake of many compartments sleeve pipe is long.
3. many compartments sleeve pipe composite pile according to claim 1 is characterized in that described many compartments sleeve pipe is single wall or double-walled, and material is PVC, PE or HDPE.
4. many compartments sleeve pipe composite pile according to claim 1 is characterized in that described many compartments sleeve pipe is a pipe, and described rigidity pile body and flexible pile body arrange that along the circle spacing middle part compartment is arranged to rigidity pile body or flexible pile body.
5. many compartments sleeve pipe composite pile according to claim 1 is characterized in that described many compartments sleeve pipe is a square tube, and the rigidity pile body is arranged on the diagonal, four jiaos of placement of flexible pile bodies; Perhaps the rigidity pile body is arranged in inside, and flexible pile body is arranged along periphery; Perhaps the rigidity pile body is " ten " word and is arranged on the axis four jiaos of placement of flexible pile bodies.
6. the job practices of many compartments sleeve pipe composite pile is characterized in that, comprises the steps:
Adopt joint that many compartments sleeve pipe is connected according to designing pile length, and be connected with precast pile tip;
According to the precast pile tip size, outsourcing geotextile bag around sleeve pipe;
Under the traction of lifting rope, many compartments sleeve pipe is put into immersed tube from the immersed tube bottom, adopt the pipeline sinking pile machine, the auxiliary vibration of static pressure is squeezed in the ground;
Treat certain regional many compartments sleeve pipe concentrate set finish after; After in the part compartment, laying vertical Grouting Pipe, pour into gravel, building waste or rubble, and take fixation to make vertical Grouting Pipe be positioned at the center of compartment; And this compartment closedtop closed, form flexible pile body;
Lay cover plate template or excavation clay model according to the cover plate design size;
In the part compartment of many compartments sleeve pipe, pour into pea gravel concreten or mortar according to designing requirement, irritate to the stake top, plug a top reinforcing bar, form the rigidity pile body;
Lay the cover plate arrangement of reinforcement, the cast cover plate;
After treating that pile body and cover plate intensity are up to standard, lay reinforcement cushion, lay the horizontal grouting pipe, the horizontal grouting pipe is connected with the interior vertical Grouting Pipe of flexible pile body, and the horizontal grouting pipe is caused dykes and dams toe place;
Carry out that dykes and dams fill and precompressed, fill at dykes and dams that vertical Grouting Pipe, horizontal grouting pipe use as the draining chimney filter in the process, can adopt submersible pump or vacuum pump to draw water;
(10) based on the dykes and dams rate of settling, during the precompressed phase finishes back or operation, in flexible pile body, inject cement grout through vertical Grouting Pipe, horizontal grouting pipe, the discrete material slurry in the flexible pile body becomes the rigidity pile body admittedly.
7. the job practices of many compartments sleeve pipe composite pile according to claim 6 is characterized in that many compartments outside of sleeve coats the water permeability geotextile, and the slurries that step (10) is injected diffuse to and form cement-soil in the outsourcing geotextile bag.
8. the job practices of many compartments sleeve pipe composite pile according to claim 6 is characterized in that described many compartments sleeve pipe is single wall or double-walled pipe or square tube, and material is PVC, PE or HDPE; Grouting Pipe pre-buried in the flexible pile body is buried underground or long the burying underground of part stake along the full stake of sleeve pipe is long.
9. the job practices of many compartments sleeve pipe composite pile according to claim 6 is characterized in that described many compartments sleeve pipe is a pipe, and described rigidity pile body and flexible pile body arrange that along the circle spacing middle part compartment is arranged to rigidity pile body or flexible pile body; Perhaps described many compartments sleeve pipe is a square tube, and the rigidity pile body is arranged on the diagonal, four jiaos of placement of flexible pile bodies; Perhaps the rigidity pile body is arranged in inside, and flexible pile body is arranged along periphery; Perhaps the rigidity pile body is " ten " word and is arranged on the axis four jiaos of placement of flexible pile bodies.
10. the job practices of many compartments sleeve pipe composite pile according to claim 6 is characterized in that in bed course, laying air-locked closing membrane to combine with vacuum preloading.
CN201110253972.8A 2011-08-31 2011-08-31 Multi-compartment casing composite pile and construction method thereof Expired - Fee Related CN102433876B (en)

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