CN204370411U

CN204370411U - A kind of expanded bore pile

Info

Publication number: CN204370411U
Application number: CN201420702912.9U
Authority: CN
Inventors: 张红; 张鼎波; 张锴峰
Original assignee: Individual
Current assignee: Individual
Priority date: 2014-11-20
Filing date: 2014-11-20
Publication date: 2015-06-03
Anticipated expiration: 2024-11-20

Abstract

The utility model relates to a kind of expanded bore pile, comprise and be vertically arranged on pile body in boring and there is gap between the pile body whole body and boring, obturator and injecting cement paste is filled with in gap, under the stake of pile body, side has an enlarged footing, enlarged footing from top to bottom comprises harsh concrete, compacting prose style free from parallelism inserts and solid soil successively, and pile body bottom to enter in enlarged footing and is filled with injecting cement paste between pile body bottom and harsh concrete; The expanded bore pile construction period designed by the utility model is short, and efficiency is high, and the pile foundation quality produced is good, cost is low, bearing capacity is high.

Description

A kind of expanded bore pile

Technical field

The utility model relates to the pile foundation field in civil engineering, particularly relates to a kind of expanded bore pile.

Background technology

Long auger guncreting pile technology because of noiselessness, shockproof, without soil compaction effect, can near architecture construction, low to site requirements, streamlined operation pile effect is high, can pumping variation material, pore-forming specification is adjustable, without sediment with the plurality of advantages such as the side coefficient of friction resistance is high, applicable soil nature scope is wide, under coastal " phreatic high, upper soft lower hard " engineering geological conditions, to become in construction market an important technology; But for high-bearing capacity stake, its cast-in-place steel bar concrete intensity is limited again, can only increase pile body specification to meet, constrain its scope of application.

With a large amount of height, to build (structure) crop in large scale more and more higher for the requirement for bearing capacity of ground king-pile, relatively can improve the carrier pile technology of bearing capacity by a relatively large margin, better pile-type when being selection of foundation pile; But for obtaining the bearing capacity of 200T even more than the 500T limit, as only adopted the carrier pile process equipment of routine, standard to construct, there is larger difficulty in coastal area.

Utility model content

Technical problem to be solved in the utility model is, overcomes the shortcoming of prior art, provides a kind of expanded bore pile, and this pile driving construction duration is short, and efficiency is high, and the pile foundation quality produced is good, cost is low, bearing capacity is high.

In order to solve above technical problem, the utility model provides a kind of expanded bore pile, comprise and be vertically arranged on pile body in boring and there is gap between the pile body whole body and boring, obturator and injecting cement paste is filled with in gap, under the stake of pile body, side has an enlarged footing, enlarged footing from top to bottom comprises harsh concrete, compacting prose style free from parallelism inserts and solid soil successively, and pile body bottom to enter in enlarged footing and is filled with injecting cement paste between pile body bottom and harsh concrete;

Technique effect: the bearing capacity of pile foundation designed by the utility model is high, cost is low, the compact earth by optimum and the high-strength prefabricated pile tube through slip casting around pile, provide the high-bearing capacity of stake, cost performance is high; The injecting treatment at the stake end ensure that pile body and carrier good combination, ensure that pile quality.

The technical scheme that the utility model limits further is:

Aforesaid expanded bore pile, pile body bottom enters vertical depth in enlarged footing and reaches 5-10cm; The bottom of prefabricated tubular pile enters enlarged footing 5-10cm, thus joint portion bottom stake is more firmly durable.

Accompanying drawing explanation

The structural representation of the expanded bore pile of Fig. 1 designed by the utility model.

Detailed description of the invention

Embodiment 1

Structure as shown in Figure 1, present embodiments provide a kind of expanded bore pile, comprise and be vertically arranged on pile body in boring and there is gap between the pile body whole body and boring, obturator and injecting cement paste is filled with in gap, under the stake of pile body, side has an enlarged footing, enlarged footing from top to bottom comprises harsh concrete, compacting prose style free from parallelism inserts and solid soil successively, and pile body bottom to enter in enlarged footing and is filled with injecting cement paste between pile body bottom and harsh concrete;

Aforesaid expanded bore pile, obturator is made up of one or more in mud, cement-soil, sand-cement and cement, flyash sand and obturator is liquid; Aforesaid expanded bore pile, grout material is the mixture that cement, flyash and water glass are formed;

In practice of construction, the Specific construction step of described expanded bore pile is:

1., in pre-fixed pile, utilize drill hole of drilling machine to set depth and fill with obturator to pressure in boring; Pressure that technique or bidirectional helix extruding-enlarging technique completes obturator is filled with to adopt long auger pressure to fill with, and wherein, when adopting long auger pressure to fill with technique, upwards carries drilling rod limit pumping obturator in boring completing boring back;

Obturator is made up of one or more in mud, cement-soil, sand-cement and cement, flyash sand and obturator is liquid, and the input amount of obturator is the 40%-60% of borehole volume;

2. inserted by steel pile casting in above-mentioned boring, steel pile casting side is welded with Grouting Pipe, Grouting Pipe along steel pile casting length direction arrange and its bottom grows 2-3cm bottom steel pile casting;

Insertion that the inserted mode of steel pile casting is hammering insertion, static pressure inserts or the vibrating hammer of employing band hydraulically operated fixture shakes, the steel pile casting upper end after insertion exceeds boring upper edge 50-60cm; Meanwhile, at steel pile casting before insertion of shaking, first insert certain depth by bottom steel pile casting at the surperficial Vertical Vibrating of base soil, thus bottom steel pile casting, form soil plug, native plug thickness is vertically 50-80cm;

3. inserts is dropped into from steel pile casting open top, inserts is made up of one or more in brickbat, sandstone, broken concrete, cement mixture, cobble and slag, and utilize post hammer to ram steel pile casting inner filling material, make the closely knit reinforcing of the foundation soil body of steel pile casting bottom certain depth and scope, form optimum compact earth;

In practice of construction, the final filling compacting degree of inserts is controlled by the design load that three hit total injection amount, namely when not feeding intake, the three injection amounts of hitting are made a call to falling apart from test hammer ram is empty continuously so that predetermined hammer is heavy, in practical operation, the injection amount of dropping hammer for three times is successively decreased successively, namely three hits total injection amount and is less than the design load that three hit total injection amount in practical operation;

Optimum compact earth meets following condition: foundation surface does not swell and do not impact the established solid soil in adjacent studs position, forms the enlarged footing from top to bottom comprising compacting prose style free from parallelism inserts and solid soil successively in stake bottom; Stake bottom forms optimum compact earth, obtains the maximum diffusion area Ae of stake bottom thus, makes pile foundation obtain maximum bearing capacity simultaneously;

Drop into a certain amount of harsh concrete from the gradation of steel pile casting top again, the input amount of each harsh concrete is 0.05m ³, the volume of harsh concrete amounts to 0.3-0.5m ³, repeatedly form the enlarged footing from top to bottom comprising harsh concrete, compacting prose style free from parallelism inserts and solid soil successively after compacting in stake bottom and receive hammer;

4. with the hydraulically operated fixture clamping prefabricated tubular pile on vibrating hammer, move to steel pile casting open top position and put into steel pile casting, when hydraulically operated fixture drops to steel pile casting aperture position, unclamping prefabricated tubular pile makes bottom its free-falling to steel pile casting, and adopt post to hammer into shape vertically to touch prefabricated tubular pile and make it enter into carrier enlarged footing, ceasing driving standard is that the vertical depth that prefabricated tubular pile lower end enters carrier enlarged footing reaches 5-10cm;

5. carry out grouting operation by the Grouting Pipe of steel pile casting side, in practice of construction, the sidewall of steel pile casting is welded with along its length four Grouting Pipe, four Grouting Pipe are arranged at equal intervals along steel pile casting circumferencial direction; By high-pressure slip-casting equipment connection to the Grouting Pipe of steel pile casting sidewall, Grouting Pipe bottom and lateral surface are provided with close measure, under High Pressure, can wash shutoff open, thus carry out high-pressure slip-casting to the bottom of prefabricated tubular pile and stake side;

Grout material is the mixture that cement, flyash and water glass are formed, and control grouting pressure and be less than 1MPa, the puddled soil initial setting time is 10-20min, and slurries injection rate is 16%-20%;

6., after slip casting completes, with the hydraulically operated fixture clamping steel pile casting upper end on vibrating hammer, steel pile casting of extricating oneself from a predicament and brace oneself up to action, namely completes the construction of expanded bore pile.

Above embodiment is only and technological thought of the present utility model is described; protection domain of the present utility model can not be limited with this; every technological thought according to the utility model proposes, any change that technical scheme basis is done, all falls within the utility model protection domain.

Claims

1. an expanded bore pile, it is characterized in that, comprise and be vertically arranged on pile body in boring and there is gap between the described pile body whole body and boring, obturator and injecting cement paste is filled with in described gap, under the stake of described pile body, side has an enlarged footing, described enlarged footing from top to bottom comprises harsh concrete, compacting prose style free from parallelism inserts and solid soil successively, and described pile body bottom to enter in enlarged footing and is filled with injecting cement paste between described pile body bottom and harsh concrete.

2. expanded bore pile according to claim 1, is characterized in that, described pile body bottom enters vertical depth in enlarged footing and reaches 5-10cm.