CN110158579A - A kind of bored pile construction method - Google Patents

A kind of bored pile construction method Download PDF

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Publication number
CN110158579A
CN110158579A CN201910344873.7A CN201910344873A CN110158579A CN 110158579 A CN110158579 A CN 110158579A CN 201910344873 A CN201910344873 A CN 201910344873A CN 110158579 A CN110158579 A CN 110158579A
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CN
China
Prior art keywords
conduit
construction
casing
concrete
bored pile
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201910344873.7A
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Chinese (zh)
Inventor
王军博
罗凯
赵连文
奉海
李钊
卢鑫
蒋云龙
王志军
许奎
张东琴
丁周伟
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
China 9th Engineering Bureau Of Water Conservancy & Hydropower
Sinohydro Bureau 9 Co Ltd
Original Assignee
China 9th Engineering Bureau Of Water Conservancy & Hydropower
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by China 9th Engineering Bureau Of Water Conservancy & Hydropower filed Critical China 9th Engineering Bureau Of Water Conservancy & Hydropower
Priority to CN201910344873.7A priority Critical patent/CN110158579A/en
Publication of CN110158579A publication Critical patent/CN110158579A/en
Pending legal-status Critical Current

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Classifications

    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D5/00Bulkheads, piles, or other structural elements specially adapted to foundation engineering
    • E02D5/22Piles
    • E02D5/34Concrete or concrete-like piles cast in position ; Apparatus for making same
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D5/00Bulkheads, piles, or other structural elements specially adapted to foundation engineering
    • E02D5/66Mould-pipes or other moulds
    • E02D5/68Mould-pipes or other moulds for making bulkheads or elements thereof

Abstract

The invention discloses a kind of bored pile construction methods, characterized by the following steps: preparation of construction, shield-tube embedment, clay pulping, drilling and forming hole, borehole cleaning, lift steel reinforcement cage, conduit is set up, secondary pile hole cleaning, filling concrete, remove conduit, remove casing and drilling machine displacement, implementation through the invention, the construction of pile foundation can be gone on smoothly under conditions of the complicated geologies such as mountain area, pass through the safeguard procedures such as casing when construction, it prevents from collapsing in stake holes, improve the safety and construction efficiency of construction, cast-in-situ bored pile can effectively control settlement of foundation, to generate consolidation effect to soil layer, so that pile foundation is reliable and stable.

Description

A kind of bored pile construction method
Technical field
The invention belongs to building engineering construction method field more particularly to a kind of bored pile construction methods.
Background technique
Make in the area construction bridge of the complex geologic conditions such as some mountain areas, in order to guarantee the stabilization of bridge, bridge pier needs ground Face direct requirement is attached by pile foundation, and in the case where the complexity of mountain area geology rock stratum, slope is relatively steep in length and breadth in mountain area, earth's surface The factors such as weathering, it is stronger to act on, job location height above sea level, and relative relief is big cause site operation difficult, influence pile foundation Construction speed and efficiency, and the construction speed of pile foundation influences whether the construction speed of Bridge Project, it is therefore desirable to a kind of drilling Cast-in-place pile construction method can carry out the construction of pile foundation under the geological conditions of mountain area complexity.
Summary of the invention
In order to solve the above technical problems, can solve existing skill the present invention provides a kind of bored pile construction method The low problem of art construction efficiency.
The present invention is achieved by the following technical programs.
A kind of bored pile construction method provided by the invention, it is characterised in that the following steps are included:
Levelling of the land to designed elevation is removed sundries, surface dust in work scene by S1, preparation of construction, hand fit's machinery, And soil layer does compacting processing, does cure process within the scope of hell surrounding 2m;
S2, shield-tube embedment, casing top side location deviation need to be less than 5cm, and vertical line gradient need to be less than 1%, casing center It is overlapped with pile center, casing height is 0.3m higher than ground to 2.5m;
S3, clay pulping excavate mud pit, produce slurry coat method using clay for preparing mud or bentonite, pulping amount is 2 to 3 The volume of concrete of stake again;
S4, drilling and forming hole drill to ground by drilling machine, drilling rod, drill bit, in drilling process, often extremely into 5m 8m checks bore diameter and vertical degree, and checks slag specimen, is checked with log sheet;
S5, borehole cleaning, by changing slurry, taking out slurry, draw slag or the method for air compressor machine injection, to being cleaned in stake holes;
S6 lifts steel reinforcement cage, steel reinforcement cage is mounted in stake holes by lifting equipment;
S7, conduit are set up, and conduit is mounted in stake holes;
S8, secondary pile hole cleaning, by changing slurry, taking out slurry, draw slag or the method for air compressor machine injection, to being cleaned in stake holes;
S9, filling concrete, by conduit into stake holes concrete perfusion, form pile foundation.
S10 removes conduit, and when carrying out step S9, conduit lower end is constantly lifted with the height of concrete grout, and is removed Part on conduit, shortens catheter length;
S11 removes casing and drilling machine displacement, the casing in stake holes is removed, and drilling machine is shifted, complete cast-in-situ bored pile Construction operation.
In step s 2, the casing with a thickness of the steel plate of 6mm to 15mm using rolling, and the internal diameter of casing is than stake diameter Big 20cm to 40cm.
In step s3, the colloidity of the slurry coat method is greater than 95%, and sand factor is not more than 4%, relative density 1.2 To 1.4, viscosity is 16 to 28pa.s, and acidity-basicity ph value is 8~10.
In step s3, the liquid level of the slurry coat method is 1.0m higher than level of ground water to 1.5m.
It in step S3 and step S8, is sprayed using air compressor machine and carries out borehole cleaning, injection pressure is 0.8Mpa to 1Mpa, when borehole cleaning Grout-jetting pipe need to be inserted into bottom hole.
In the step s 7, the conduit is made of more piece single tube, and single tube internal diameter is 25cm to 30cm, and every section single tube is a length of 2.5m to 3m, single tube part are connected with each other by ring flange.
In step s 9,2m to 6m in conduit Transducers Embedded in Concrete, and gradually risen with hole inner concrete face.
The beneficial effects of the present invention are: implementation through the invention, it can be suitable under conditions of the complicated geologies such as mountain area Benefit carries out the construction of pile foundation, by safeguard procedures such as casings when construction, prevents from collapsing in stake holes, improve construction safety and Construction efficiency, cast-in-situ bored pile can effectively control settlement of foundation, so that consolidation effect is generated to soil layer, so that pile foundation stabilization can It leans on.
Detailed description of the invention
Fig. 1 is construction process for bored pile flow chart;
Specific embodiment
Be described further below technical solution of the present invention, but claimed range be not limited to it is described.
As shown in Figure 1, a kind of bored pile construction method, it is characterised in that the following steps are included:
Levelling of the land to designed elevation is removed sundries, surface dust in work scene by S1, preparation of construction, hand fit's machinery, And soil layer does compacting processing, and cure process, while the accurate surveying and locating of survey crew are done within the scope of hell surrounding 2m, is accurately applied Pile foundation center line is put, determines aperture absolute altitude.And establish 4 points of cross hairs around hole and fender pile is set, hole is checked and corrected in time Position drift condition, bore operation elevation bench mark lead to retaining wall top by control bench mark.
S2, shield-tube embedment, casing top side location deviation need to be less than 5cm, and vertical line gradient need to be less than 1%, casing center Be overlapped with pile center, casing height is 0.3m higher than ground to 2.5m, casing under conditions of Ordinary Work occasion and small aperture, Steel plate using thickness not less than 6mm rolls, and under the conditions ofs deep water, complicated geological and large aperture etc., is preferably not less than using thickness 10mm steel plate rolls, and perpendicular positioning is accurate when burying casing, and top side location deviation is not more than 5cm, and vertical line gradient is little In 1%.After actual measurement positioning, it is overlapped casing center with pile center, casing height 0.3m preferably above ground level or water surface 1.0m is extremely 2.0m should be higher than that when there is artesian water in drilling and hold hydraulic pressure water level 2.0m or more after stablizing, if pressure water head is unstable or steady It is many to be higher by level of ground water for pressure water head after fixed, should first do test pile, identify and use the feasibility of cast-in-situ bored pile in such area. Shield-tube embedment excavates certain depth and buries casing, buried depth is 2~4m, casing pair i.e. after stake position cross centre line is released in measurement After position checks, in its surrounding backfill cohesive soil and compaction in layers.
S3, clay pulping excavate mud pit, produce slurry coat method using clay for preparing mud or bentonite, pulping amount is 2 to 3 The volume of concrete of stake again.
S4, drilling and forming hole drill to ground by drilling machine, drilling rod, drill bit, in drilling process, often extremely into 5m 8m checks bore diameter and vertical degree, and checks slag specimen, is checked with log sheet, rushes the wirerope of cone with casing center Position deviation is not more than 2cm, steadily must not collide retaining wall and hole wall when going up and down conehead.Bore operation must be continuous, and bores Hole construction note, and need that periodically drilling slurry is detected and tested, it needs to adjust at any time when undesirable, entire In work progress, the loss of mud is smaller, and head is always ensured that in 2m to 3m, effectively prevents hole wall collapse, burying head Phenomenon occurs, it is ensured that the hole quality and speed of fulfiling hole of drilled pile.When boring procedure such as encounters loose sand sand cobble layer, Yao Jinhang It after retaining wall, can drill to next process, bore operation must work continuously, and must not interrupt, because extraordinary circumstances are necessary When stopping boring, aperture should add protecting cover, and drill bit is forbidden to stay in hole, to prevent burying, be reached with drilling steel wire fathom drilling drilling depth After design requirement, hole depth, aperture and hole shape etc. are checked, after confirmation meets design requirement, whole hole is filled in and checks card, through staying Ground supervising engineer approves, can carry out the preparation of bottom hole cleaning and pouring underwater concrete.
S5, borehole cleaning, by changing slurry, taking out slurry, draw slag or the method for air compressor machine injection, to being cleaned in stake holes.
S6 lifts steel reinforcement cage, steel reinforcement cage is mounted in stake holes by lifting equipment, steel reinforcement cage is added at the construction field (site) Work, main reinforcement are mechanically connected with straight screw sleeve, and using being welded to connect, crane cooperation lifting is pacified for stirrup, stiffener, spacer bar Dress.Reinforcement cage skeleton has enough rigidity and stability, to transport, lift and will not loose, deformation when concrete perfusion. Reinforced steel is added together every 2m when production, and in skeleton upper end, hanging ring is rationally set according to actual needs.
S7, conduit are set up, and conduit is mounted in stake holes, and conduit is the important tool of concrete perfusion, this process selection Rigid conduit, conduit setting stock chest suitable for reading and funnel.
S8, secondary pile hole cleaning, by changing slurry, taking out slurry, draw slag or the method for air compressor machine injection, to being cleaned in stake holes;
S9, filling concrete, by conduit into stake holes concrete perfusion, form pile foundation, first batch of concrete be perfused and exists Lock gate is set at conduit funnel base opening, and conduit bottom end to bottom hole spacing about 40cm, concrete pours into funnel, pushes down check (non-return) valve It moves downward, water is extruded from tube bottom in conduit, is gradually arranged from well head to outside well, and concrete is depressed into hole by self weight and to lower punch power Bottom, conduit length of embedment are controlled in 2~6m, and as concrete constantly pours into, hole inner concrete face is gradually risen, and hole internal water accumulation is not Disconnected to rise, until concrete fills complete opening, mud is all discharged, after perfusion starts, it is necessary to continuously carry out in an orderly manner, shortening is torn open Except the time of conduit then needs to reduce filling concrete speed, prevents from causing height in conduit when conduit inner concrete is discontented Air bag is pressed, so that concrete filling is not gone down or is pressed and leaks conduit.
The calculating formula being perfused for the first time: V >=π D2(H1+H2)/4+πd2hl/4
In formula: V --- first batch of concrete requirement (m is perfused3)
D --- stake holes diameter (m)
H1 --- stake holes is down to conduit bottom end apart from (m)
H2 --- the first buried depth (m) of conduit
D --- catheter diameter (m)
H1 --- stake holes inner concrete reaches buried depth H2,
Height (m) needed for outer (or mud) pressure of conduit inner concrete column equilibration conduit, hl=H3rw/rc
In H3 --- wellhole or the depth of mud
Rw --- the severe (KN/m of water or mud in wellhole3)
The severe of rc --- concrete mix (takes 24KN, m3)
S10 removes conduit, and when carrying out step S9, conduit lower end is constantly lifted with the height of concrete grout, and is removed Part on conduit, shortens catheter length, when conduit is promoted, holding position placed in the middle, determines conduit according to conduit buried depth Hoisting depth, the promotion embedding depth of rear tube are 2m to 6m.
S11 removes casing and drilling machine displacement, the casing in stake holes is removed, and drilling machine is shifted, complete cast-in-situ bored pile Construction operation will extract casing after concrete perfusion is complete, be in ground and stake top well head Integral rigid casing below, It is extracted immediately after concrete has been perfused, more than ground, the casing that can be dismantled must be after concrete crushing strength reaches 5MPa It could remove.
In step s 2, the casing with a thickness of the steel plate of 6mm to 15mm using rolling, and the internal diameter of casing is than stake diameter Big 20cm to 40cm is convenient for concrete casting and removes.
In step s3, the colloidity of the slurry coat method is greater than 95%, and sand factor is not more than 4%, relative density 1.2 To 1.4, viscosity is 16 to 28pa.s, and acidity-basicity ph value is 8~10.
In step s3, the liquid level of the slurry coat method is 1.0m higher than level of ground water to 1.5m.
It in step S3 and step S8, is sprayed using air compressor machine and carries out borehole cleaning, injection pressure is 0.8Mpa to 1Mpa, when borehole cleaning Grout-jetting pipe need to be inserted into bottom hole, and the insertion depth of Grout-jetting pipe is not in place will to be caused to spray collapse hole.
In the step s 7, the conduit is made of more piece single tube, and single tube internal diameter is 25cm to 30cm, and every section single tube is a length of 2.5m to 3m, single tube part are connected with each other by ring flange, after conduit integral raising, can remove the single tube on top, to guarantee Normal perfusion.
In step s 9,2m to 6m in conduit Transducers Embedded in Concrete, and gradually risen with hole inner concrete face, guarantee coagulation The quality of soil perfusion.

Claims (7)

1. a kind of bored pile construction method, it is characterised in that the following steps are included:
Levelling of the land to designed elevation is removed sundries, surface dust in work scene, and soil by S1, preparation of construction, hand fit's machinery Layer does compacting processing, does cure process within the scope of hell surrounding 2m;
S2, shield-tube embedment, casing top side location deviation need to be less than 5cm, and vertical line gradient need to be less than 1%, casing center and stake Center is overlapped, and casing height is 0.3m higher than ground to 2.5m;
S3, clay pulping excavate mud pit, produce slurry coat method using clay for preparing mud or bentonite, pulping amount is 2 to 3 times The volume of concrete of stake;
S4, drilling and forming hole drill to ground by drilling machine, drilling rod, drill bit, in drilling process, often need into 5m to 8m It checks bore diameter and vertical degree, and checks slag specimen, checked with log sheet;
S5, borehole cleaning, by changing slurry, taking out slurry, draw slag or the method for air compressor machine injection, to being cleaned in stake holes;
S6 lifts steel reinforcement cage, steel reinforcement cage is mounted in stake holes by lifting equipment;
S7, conduit are set up, and conduit is mounted in stake holes;
S8, secondary pile hole cleaning, by changing slurry, taking out slurry, draw slag or the method for air compressor machine injection, to being cleaned in stake holes;
S9, filling concrete, by conduit into stake holes concrete perfusion, form pile foundation.
S10 removes conduit, and when carrying out step S9, conduit lower end is constantly lifted with the height of concrete grout, and removes conduit Upper part, shortens catheter length;
S11 removes casing and drilling machine displacement, the casing in stake holes is removed, and drilling machine is shifted, complete bored pile construction Operation.
2. a kind of bored pile construction method as described in claim 1, it is characterised in that: in step s 2, the casing It is rolled using the steel plate with a thickness of 6mm to 15mm, the internal diameter of casing is 20cm bigger than stake diameter to 40cm.
3. a kind of bored pile construction method as described in claim 1, it is characterised in that: in step s3, the retaining wall The colloidity of mud is greater than 95%, and sand factor is not more than 4%, and relative density is 1.2 to 1.4, and viscosity is 16 to 28pa.s, soda acid Spending pH value is 8~10.
4. a kind of bored pile construction method as described in claim 1, it is characterised in that: in step s3, the retaining wall The liquid level of mud is 1.0m higher than level of ground water to 1.5m.
5. a kind of bored pile construction method as described in claim 1, it is characterised in that: in step S3 and step S8, adopt Carries out borehole cleaning with air compressor machine injection, injection pressure is 0.8Mpa to 1Mpa, and Grout-jetting pipe need to be inserted into bottom hole when borehole cleaning.
6. a kind of bored pile construction method as described in claim 1, it is characterised in that: in the step s 7, the conduit It is made of more piece single tube, single tube internal diameter is 25cm to 30cm, and every section single tube a length of 2.5m to 3m, it is mutual that single tube part passes through ring flange Connection.
7. a kind of bored pile construction method as described in claim 1, it is characterised in that: in step s 9, conduit embedment 2m to 6m in concrete, and gradually risen with hole inner concrete face.
CN201910344873.7A 2019-04-26 2019-04-26 A kind of bored pile construction method Pending CN110158579A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111535305A (en) * 2020-05-07 2020-08-14 中铁隧道局集团有限公司 Construction method of cast-in-situ bored pile for air well

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CN107905118A (en) * 2017-12-26 2018-04-13 杭州市城市建设基础工程有限公司 Large bridge pile base construction method
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CN104153352A (en) * 2014-07-31 2014-11-19 广西科技大学 Karst geology rotary-drilling bored concrete pile hole forming process
CN106013092A (en) * 2016-06-08 2016-10-12 深圳市宏业基基础工程有限公司 Cast-in-situ bored pile construction method
CN108049396A (en) * 2017-12-21 2018-05-18 中铁三局集团华东建设有限公司 Cast-in-situ bored pile churning driven sleeve drilling construction method
CN107905118A (en) * 2017-12-26 2018-04-13 杭州市城市建设基础工程有限公司 Large bridge pile base construction method

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111535305A (en) * 2020-05-07 2020-08-14 中铁隧道局集团有限公司 Construction method of cast-in-situ bored pile for air well

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