CN107178081A - A kind of prestressing force post jacking variable cross-section hollow shell pill and its construction method - Google Patents
A kind of prestressing force post jacking variable cross-section hollow shell pill and its construction method Download PDFInfo
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- CN107178081A CN107178081A CN201710554977.1A CN201710554977A CN107178081A CN 107178081 A CN107178081 A CN 107178081A CN 201710554977 A CN201710554977 A CN 201710554977A CN 107178081 A CN107178081 A CN 107178081A
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- pile
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- prestressing force
- hollow shell
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/58—Prestressed concrete piles
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D7/00—Methods or apparatus for placing sheet pile bulkheads, piles, mouldpipes, or other moulds
- E02D7/20—Placing by pressure or pulling power
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- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
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- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The invention discloses a kind of prestressing force post jacking variable cross-section hollow shell pill and its construction method, it is characterized in that：The variable cross-section reinforcement concrete pile tube of vertical through hole is carried centered on the pile tube：The steel reinforcement cage of described reinforced concrete pipe pile is made up of eight reinforcing bars and multiple stirrups, and eight reinforcing bars are fixed in the stirrup of multiple consistencies from top to bottom distribution vertically, and eight reinforcing bars are uniformly distributed along stirrup surrounding, and reinforcing bar and stirrup are simultaneously fastened in concrete；It is also even in the concrete of vertical through hole surrounding to be furnished with two madjack pipes for being deep to a bottom.The invention also discloses construction method, its innovative point is：The fine cracks perpendicular to pile body produced after varying cross-section duct sunk pile stabilization are filled by the way of post jacking.This of the present invention can fully reinforce inter-pile soil in variable cross-section hollow shell pill by the Post Grouting Technique of madjack pipe, increase the frictional force and snap-in force of pile body, while injection and curable slurries can obstruct underground water, and then enhancing pile body durability after these again.
Description
Technical field
The present invention relates to prestressing force variable cross-section hollow shell pill technical field, and in particular to prestressing force post jacking in building field
The improvement areas of variable cross-section hollow shell pill.
Background technology
Prestressed reinforced concrete stake pile reliability is high, is saved with material, but is due to straightforward face stake pile body smooth in appearance,
Soil body frictional force is small, and pile top bottom bearing is then difficult to play.Though great changes have taken place now and progressive non-uniform pile, due to
The sedimentation of pile body, causes a range of soil body around the pile body of undergauge face to form area of coming to nothing, the soil body has loosened, so that should
The frictional resistance of section pile body can not also give full play to；Moreover reinforcing bar is in stress state, in some coastal and Salt Lake Area underground water
In high-concentration chlorine ion can accelerate the corrosion of reinforcing bar, the durability of prestressing force variable cross-section reinforcement concrete stake allows of no optimist,
Application in engineering is also restricted.
The content of the invention
In view of the above-mentioned problems, first purpose of the present invention is to provide a kind of prestressing force post jacking variable cross-section hollow shell pill.
To solve the above problems, the technical solution adopted by the present invention is：A kind of prestressing force post jacking variable cross-section hollow shell pill,
It is characterized in that：The variable cross-section reinforcement concrete pile tube of vertical through hole 1 is carried centered on the pile tube：Described reinforced concrete pipe pile
Steel reinforcement cage be made up of eight reinforcing bars 3 and multiple stirrups 5, eight reinforcing bars 3 are fixed on the hoop of multiple consistencies from top to bottom distribution vertically
In muscle 5, and eight reinforcing bars 3 are uniformly distributed along the surrounding of stirrup 5, and reinforcing bar and stirrup are simultaneously fastened in concrete 6；In vertical through hole 1
It is also even in the concrete of surrounding to be furnished with two madjack pipes 2 for being deep to a bottom.
The prestressing force post jacking variable cross-section hollow shell pill is high 15m, expanding face diameter 450mm, undergauge face diameter 400mm, sky
The a diameter of 150mm of center portion point variable cross-section pile tube, to avoid the two sections stress being connected up and down mutually superimposed, influences bottom bearing
Give full play to, so often saving the height h in expanding face1＞ 3D1（D1For expanding face diameter）, i.e., each high 1.5m in expanding face is often saved,
Often save the height h in undergauge face2＞ 3D2（D2For undergauge face diameter）, i.e., the often section undergauge each high 1.5m in face.
The a diameter of 20mm of madjack pipe.
The bar diameter is 16mm, and stirrup diameter is 18mm.
Second object of the present invention is to provide a kind of construction method of prestressing force post jacking variable cross-section hollow shell pill, its
It is characterized in：Prestressing force post jacking variable cross-section hollow shell pill conserves shaping and static loading experiment meets the design requirement of bearing capacity of single pile,
Using static pressure pile-sinking after stable, soil property is entered in central vertical throughbore 1；In 5-10 days after pile sinking is stable, pass through pressure
Starch shallow after the injection cement grout of pipe 2, first depth, cement mortar is successively risen upwards along pile body, while being oozed by crack into the soil body
Thoroughly, after after cement grout solidification, prestressing force post jacking variable cross-section hollow shell pill completes construction.
The design requirement that the prestressing force post jacking variable cross-section hollow shell pill meets bearing capacity of single pile is that single-pile vertical orientation resists
Ultimate bearing capacity is pressed to be not less than vertical allowable load capacity of single pile design load 1840kN.
The prestressing force post jacking variable cross-section hollow shell pill of the present invention and its advantage of construction method are：Injected after madjack pipe
Cement grout changes the physical mechanics of an end and its neighbouring Pile side soil body by infiltration, filling, densification and consolidation collective effect
Property, eliminates pile bottom sediment and all gaps of stake to the adverse effect of stake, improves stake Soil Interface condition and make end resistance and stake side
Resistance obtains different degrees of raising, and the sedimentation of stake is reduced, and average settlement amount is hollow compared to common prestressing force variable cross-section
Pile tube reduces 2.18mm~4.89mm, and the load-carrying properties of stake are improved, and bearing capacity increase rate makes in 16%-31%
Stake has preferable stability.The prestressing force post jacking variable cross-section hollow shell pill can give full play to holding for foundation soil and pile shaft material
Potentiality are carried, construction costs are reduced to greatest extent, cost reduces 10%~15%, answering for post-grouting technology can have both been given full play to
With the consumption of concrete, economical rationality can be reduced again.
Brief description of the drawings
Fig. 1 is prestressing force post jacking variable cross-section hollow shell pill schematic diagram of the present invention.
Fig. 2 is the effect schematic diagram injected after cement mortar.
Fig. 3 is the top view of prestressing force post jacking variable cross-section hollow shell pill.
Fig. 4 is the schematic diagram of steel reinforcement cage inside prestressing force post jacking variable cross-section hollow shell pill.
Wherein pile tube central vertical throughbore 1, madjack pipe 2, reinforcing bar 3, the product soil 4 in pile tube central vertical throughbore, stirrup 5,
The gap 7 of concrete 6, the pile body periphery soil body.
Embodiment
With reference to accompanying drawing, structure of the present invention is described further.
A kind of prestressing force post jacking variable cross-section hollow shell pill, it is characterized in that：The change of vertical through hole 1 is carried centered on the pile tube
Section reinforced concrete pipe pile：The steel reinforcement cage of described reinforced concrete pipe pile is made up of eight reinforcing bars 3 and multiple stirrups 5,
Eight reinforcing bars 3 are fixed in the stirrup 5 of multiple consistency from top to bottom distributions vertically, and eight reinforcing bars 3 are uniformly distributed along the surrounding of stirrup 5,
Reinforcing bar and stirrup are simultaneously fastened in concrete 6；It is also even in the concrete of the vertical surrounding of through hole 1 to be furnished with two pressures for being deep to a bottom
Starch pipe 2.
The prestressing force post jacking variable cross-section hollow shell pill is high 15m, expanding face diameter 450mm, undergauge face diameter
A diameter of 150 mm of 400mm, hollow parts variable cross-section pile tube, wherein each long 1.5m in expanding face is often saved, each long 1.5m in undergauge face.
The a diameter of 20mm of the madjack pipe 2.
The a diameter of 16mm of the reinforcing bar 3, a diameter of 18mm of stirrup 5.
The operating method specifically made is：Eight tensioning of reinforcing bar 3 of stirrup 5 will have been bound with pre-tensioning system to proof stress,
Two madjack pipes 2 are erected to the diagonal end positions in centrifugal moulding mould section, then poured in centrifugal moulding mould
Concrete 6 carries out centrifugal forming, and reinforcing bar is loosened after concrete 6 pours shaping and conserves prescribed strength.
The construction method of the prestressing force post jacking variable cross-section hollow shell pill is：Prestressing force post jacking variable cross-section hollow shell pill is supported
Shield shaping and static loading experiment meets and static pressure pile-sinking is used after the design requirement of bearing capacity of single pile, should ensure that levelling of the land before pile sinking
Draining is unobstructed.After pile sinking is stable, due to taking the shape of pile tube central vertical throughbore 1, in pile driving process, soil property can be entered
Enter into pile tube central vertical throughbore 1, the product soil 4 formed in pile tube central vertical throughbore.In 5-10 days after pile sinking is stable,
Expanding face easily forms a hole, the later stage because the extruding of soil makes to lack in the soil body of undergauge face part and is expressed on pile body, now by
Caused in soil deformation and produce many fine gaps perpendicular to pile body.Cement mortar is injected from madjack pipe 2 and filled pile body week
It is shallow after the gap 7 of the side soil body, first depth, the application of post-grouting technology is substantially played, makes cement mortar successively general upwards along pile body
Rise, while being permeated by crack into the soil body, cement mortar of injection can fully reinforce inter-pile soil after these, increase pile body
Frictional force and snap-in force, so as to improve the bearing capacity and breakout capacity of pile body, bearing capacity increase rate in 16%-31%,
Average settlement amount reduces 2.18mm~4.89mm compared to common prestressing force variable cross-section hollow shell pill, and cost reduces 10%~
15%；After after cement grout solidification, corrosion of the underground water to reinforcing bar 3 in prestressing force variable cross-section hollow shell pill can be effectively prevented again,
And then strengthen the durability of pile body.
The design requirement that the prestressing force post jacking variable cross-section hollow shell pill meets bearing capacity of single pile is that single-pile vertical orientation resists
Ultimate bearing capacity is pressed to be not less than vertical allowable load capacity of single pile design load 1840kN.
The cement mortar can be effectively injected using workability is good, denseness appropriate and fill the pile body periphery soil body
Gap.
Claims (6)
1. a kind of prestressing force post jacking variable cross-section hollow shell pill, it is characterized in that：The change with vertical through hole 1 is cut centered on the pile tube
Face reinforced concrete pipe pile：The steel reinforcement cage of described reinforced concrete pipe pile is made up of eight reinforcing bars 3 and multiple stirrups 5, and eight
Root reinforcing bar 3 is fixed in the stirrup 5 of multiple consistency from top to bottom distributions vertically, and eight reinforcing bars 3 are uniformly distributed along the surrounding of stirrup 5, steel
Muscle and stirrup are simultaneously fastened in concrete 6；It is also even in the concrete of the vertical surrounding of through hole 1 to be furnished with two mud jacking for being deep to a bottom
Pipe 2.
2. a kind of prestressing force post jacking variable cross-section hollow shell pill according to claim 1 and its construction method, it is characterized in that：
The prestressing force post jacking variable cross-section hollow shell pill is high 15m, expanding face diameter 450mm, undergauge face diameter 400mm, hollow part
Divide a diameter of 150 mm variable cross-section pile tube, wherein each long 1.5m in expanding face is often saved, each long 1.5m in undergauge face.
3. a kind of prestressing force post jacking variable cross-section hollow shell pill according to claim 1 and its construction method, it is characterized in that：
The bar diameter is 16mm, and stirrup diameter is 18mm.
4. a kind of prestressing force post jacking variable cross-section hollow shell pill according to claim 1 and its construction method, it is characterized in that：
The a diameter of 20mm of madjack pipe.
5. a kind of construction method of prestressing force post jacking variable cross-section hollow shell pill, it is characterized in that：Prestressing force post jacking variable cross-section is empty
Heart tubular pile maintenance is molded and static loading experiment meets the design requirement of bearing capacity of single pile, and using static pressure pile-sinking after stable, soil property is entered
Enter into central vertical throughbore 1；In 5-10 days after pile sinking is stable, inject shallow after cement grout, first depth by madjack pipe 2,
Cement mortar is set successively to rise upwards along pile body, while being permeated by crack into the soil body, after cement grout solidifies, after prestressing force
Mud jacking variable cross-section hollow shell pill completes construction.
6. a kind of prestressing force post jacking variable cross-section hollow shell pill construction method according to claim 5, it is characterized in that：Institute
It is single pile vertical resistance pressure ultimate bearing to state prestressing force post jacking variable cross-section hollow shell pill and meet the design requirement of bearing capacity of single pile
Power is not less than vertical allowable load capacity of single pile design load 1840kN.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710554977.1A CN107178081A (en) | 2017-07-10 | 2017-07-10 | A kind of prestressing force post jacking variable cross-section hollow shell pill and its construction method |
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| CN201710554977.1A CN107178081A (en) | 2017-07-10 | 2017-07-10 | A kind of prestressing force post jacking variable cross-section hollow shell pill and its construction method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107794914A (en) * | 2017-10-20 | 2018-03-13 | 宁波大学 | A kind of combination post jacking and the prestressed concrete pipe pile of expanding technology and preparation method thereof |
| CN108972869A (en) * | 2018-08-06 | 2018-12-11 | 武汉大学 | Flush type post jacking prefabricated tubular pile production mold and production method |
| CN113463457A (en) * | 2021-05-17 | 2021-10-01 | 衡阳公路桥梁建设有限公司 | Roadbed structure for penetrating through slurry section and construction method thereof |
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| CN1609347A (en) * | 2004-11-25 | 2005-04-27 | 河北建设勘察研究院有限公司 | Follow-up mud jacking rotary digging drilling hole bored concrete pile technology |
| CN102535446A (en) * | 2012-02-20 | 2012-07-04 | 中交第一航务工程勘察设计院有限公司 | Large-cross-section driven-casing cast-in-place post-grouted concrete hollow square pile and production method thereof |
| CN102912792A (en) * | 2012-10-25 | 2013-02-06 | 李文颖 | In-situ hexagonal or octagonal tube-sinking cast-in-situ concrete hollow pile and producing method thereof |
| CN104988907A (en) * | 2015-08-02 | 2015-10-21 | 王继忠 | Construction method of concrete pile |
| CN206289627U (en) * | 2016-12-23 | 2017-06-30 | 化学工业岩土工程有限公司 | A kind of post jacking pile tube |
| CN106930282A (en) * | 2017-04-05 | 2017-07-07 | 陕西理工学院 | A kind of variable cross-section full prestressing precast reinforced concrete piles |
| CN207121903U (en) * | 2017-07-10 | 2018-03-20 | 滨州学院 | A kind of prestressing force post jacking variable cross-section hollow shell pill |
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2017
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Patent Citations (7)
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| CN1609347A (en) * | 2004-11-25 | 2005-04-27 | 河北建设勘察研究院有限公司 | Follow-up mud jacking rotary digging drilling hole bored concrete pile technology |
| CN102535446A (en) * | 2012-02-20 | 2012-07-04 | 中交第一航务工程勘察设计院有限公司 | Large-cross-section driven-casing cast-in-place post-grouted concrete hollow square pile and production method thereof |
| CN102912792A (en) * | 2012-10-25 | 2013-02-06 | 李文颖 | In-situ hexagonal or octagonal tube-sinking cast-in-situ concrete hollow pile and producing method thereof |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107794914A (en) * | 2017-10-20 | 2018-03-13 | 宁波大学 | A kind of combination post jacking and the prestressed concrete pipe pile of expanding technology and preparation method thereof |
| CN108972869A (en) * | 2018-08-06 | 2018-12-11 | 武汉大学 | Flush type post jacking prefabricated tubular pile production mold and production method |
| CN108972869B (en) * | 2018-08-06 | 2020-01-24 | 武汉大学 | Die and method for producing embedded type post-grouting precast tubular pile |
| CN113463457A (en) * | 2021-05-17 | 2021-10-01 | 衡阳公路桥梁建设有限公司 | Roadbed structure for penetrating through slurry section and construction method thereof |
| CN113463457B (en) * | 2021-05-17 | 2022-06-14 | 衡阳公路桥梁建设有限公司 | Roadbed structure for penetrating through slurry section and construction method thereof |
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