CN85108550A - Prestressed concrete foundation pile - Google Patents
Prestressed concrete foundation pile Download PDFInfo
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- CN85108550A CN85108550A CN 85108550 CN85108550A CN85108550A CN 85108550 A CN85108550 A CN 85108550A CN 85108550 CN85108550 CN 85108550 CN 85108550 A CN85108550 A CN 85108550A CN 85108550 A CN85108550 A CN 85108550A
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- Prior art keywords
- stake
- pile
- concrete
- foundation pile
- prestressed concrete
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- 239000011513 prestressed concrete Substances 0.000 title claims abstract description 20
- 239000004567 concrete Substances 0.000 claims abstract description 20
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims abstract description 9
- 238000013461 design Methods 0.000 claims abstract description 8
- 239000000203 mixture Substances 0.000 claims abstract description 7
- 238000004080 punching Methods 0.000 claims abstract description 6
- 229910000831 Steel Inorganic materials 0.000 claims description 11
- 239000010959 steel Substances 0.000 claims description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 239000004568 cement Substances 0.000 claims description 5
- 238000012423 maintenance Methods 0.000 claims description 5
- 239000003638 chemical reducing agent Substances 0.000 claims description 4
- 238000003466 welding Methods 0.000 claims description 4
- 239000011230 binding agent Substances 0.000 claims description 2
- 238000002156 mixing Methods 0.000 claims description 2
- 239000004576 sand Substances 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 13
- 238000004519 manufacturing process Methods 0.000 abstract description 12
- 239000011372 high-strength concrete Substances 0.000 abstract description 4
- 230000002787 reinforcement Effects 0.000 abstract description 3
- 238000000465 moulding Methods 0.000 abstract description 2
- 230000000149 penetrating effect Effects 0.000 abstract description 2
- 238000003756 stirring Methods 0.000 abstract 1
- 238000012360 testing method Methods 0.000 description 10
- 238000010276 construction Methods 0.000 description 7
- 238000005452 bending Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000003351 stiffener Substances 0.000 description 2
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000011178 precast concrete Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
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- Piles And Underground Anchors (AREA)
Abstract
The present invention relates to is the manufacturing process of pre-tensioned prestressed concrete stake and the job practices of foundation pile.The cage of reinforcement of moulding is in advance inserted punching block, and the concrete that the high-strength concrete design mixture proportion stirs is pressed in cast, through tension reinforcing steel bar, and the prestressed concrete pile that the centrifugal forming and the stream curing demoulding form.Manufacture method is simple, can ensure the quality of products.The stake of using this patent to make not only can be used for driven pile, also can be used for imbedding stake.Because concrete intensity height, the penetrating force of stake is strong, stake with between method of attachment simple and convenient, add different length and diameter, go for the needs of different engineerings.
Description
The present invention relates to is the manufacturing process of pre-tensioned prestressed concrete foundation pile and the job practices of foundation pile.
At present at industrial and mining enterprises, urban skyscraper, bridge, port and pier, and in the construction work of coastal area,, often adopt pile foundation for satisfying the supporting capacity on basis.Because castinplace pile and driven pile are often adopted in the restriction of conditions such as the requirement of engineering, the difference of basic geology and construction technology level.Castinplace pile is divided into boring, punching and manually digging hole filling pile again.Driven pile has precast concrete square pile, prefabricated concrete pipe pile and piling bar.Piling bar has antirust problem, especially uses to be restricted under the groundwater quality condition of severe.In order to save steel, to reduce construction costs, adopt concrete pile more and more general at present both at home and abroad.In order to improve impact force that concrete pile bears pile driver, to improve the penetrability of stake, even firm stratum also can be passed smoothly running into complicated pile breaking phenomenon does not take place.Engineers both domestic and external is in recent years improving concrete strength, is making number of research projects with prestressed reinforcement manufacturing prestressed concrete pile.For example, No. 79140585 patents of Japan Patent, the inventor is in order to improve concrete intensity, and blending by volume about 1% steel wire and is the additive of the 7-12% of cement weight, concrete compressive strength R in concrete
28=767kg/cm
2Adopt above-mentioned measure, concrete resistance to compression and tensile strength all increase, but have increased construction costs undoubtedly, and manufacturing process is also quite complicated.Again for example, No. 73900 patents of HOII P, the inventor has described a kind of callable prestressing force stiffener, this stiffener is made up of a prestressing force bracing boom, and import a nut that is fixed on the stake axle by lower bolt end in the hollow hole of foundation pile and screw, and a termination of bearing the impact force of pile driver in the stake in driving in process is arranged.This structure is to save steel, but because stake itself does not contain reinforcing bar, this increases many procedures just for transportation and work progress, and the simultaneously used pile cover and the structure of shoe are also quite complicated.
The manufacture method that the purpose of this invention is to provide a kind of prestressed concrete pipe pile is intended to promote the solution of the problems referred to above, realizes a kind of prestressed concrete pipe pile, and it both can be used as driven pile, can do again and imbed foundation pile.
Task of the present invention is finished as follows, the cage of reinforcement of moulding in advance is placed in the punching block, the concrete mixture that forms is stirred in cast by the high-strength concrete design mixture proportion, tension reinforcing steel bar applies prestressing force then, through the centrifuge centrifugal forming, after the stream curing demoulding, prestressed concrete pile has just been made.
The used high-strength concrete design mixture proportion (calculating by the absolute volume method) of the present invention is:
Cement 450-600kg/M
3
Sand coarse aggregate ratio 0.27-0.35
Water/binder ratio 0.28-0.36
Water reducing agent (accounting for cement consumption) 0.5-2.0%
For the technology that simplifies the operation, make things convenient for site operation, this match ratio can be mixed a kind of water reducing agent of powdery.Concrete crushing strength R according to above-mentioned design mixture proportion making
28=800kg/cm
2To 1000kg/cm
2
The present invention adopts the pre-tensioned prestressing method, utilizes the centrifuge centrifugal forming, and its centrifuge speed is 300-1000 rev/min.Conservation system is divided into a maintenance, and its temperature is 60 ℃-80 ℃, and curing time is 5-9 hour; The secondary maintenance can be adopted steam curing at high pressure, and its curing temperature is 180 ℃-200 ℃, and the time is 5-8 hour, also can adopt curing in water, and temperature is 20 ℃-25 ℃, and the time is 12-16 days, and two kinds of methods can get a desired effect equally.According to the manufacture method of above-mentioned prestressed concrete pile, can produce the series of products of prestressed concrete pile, its sectional dimension is 300 millimeters to 1500 millimeters by diameter D, length L is 6 meters to 14 meters, to be applicable to the needs of different engineerings and geological conditions.
Prestressed concrete pile according to manufacturing of the present invention, comprise that one group is cast in tension reinforcing steel bar in the concrete (2) and one group of anchor rod (4) in order to spud pile (1) and steel hoop (5), be evenly distributed on two terminations of stake (1), its length is 40 centimetres, diameter is 12 millimeters, it is welded together admittedly that the anchor disc (6) of it and steel hoop (4) is that electricity consumption welds, and forms an integral body, and tension reinforcing steel bar (2) adopts the heading tension mode to fix with anchor disc (6).In order to make stake (1) end local cracks not take place bearing under the excessive shaft pressuring load situation, in stake (1) end along L
2In the length range, encrypt spiral stirrup (3), along with tension reinforcing steel bar (2) diameter overstriking, the also corresponding overstriking of the diameter of spiral stirrup (3).According to the prestressed concrete pile of manufacturing of the present invention, can be suitable for the length of the required stake of different engineerings and geological conditions at the scene with the electric welding splicing.Stake with to be connected be to rely on the position of reservation groove (7) of anchor disc (6) to carry out electric welding, scolder fills up the reservation groove (7) of anchor disc (6), brush special-purpose inhibitor then, in case on abominable especially stratum or the corrosion of seawater, weld strength is greater than the intensity of stake itself, and the practical experience proof is safe and reliable with this welding method.
In addition, the anti-impact force and the penetration capacity of the prestressed concrete pile of producing for the above-mentioned manufacture method of test basis are done following experiment in test room.With three diameter D=500
Mm, length L=8m, concrete design compressive strength 800kg/cm
2Prestressed concrete pile, do bending property test.Its result of the test and calculated value compare, and the cracking moment calculated value is according to the TJ10-74 modular formula:
M
f＝（σ
hⅡ+γR
S L）W
o
Calculate and get.The ultimate bending moment calculated value is according to the TJ10-74 modular formula:
M
p＝〔R
WA (r
1+r
2)/2 +（R
y s+σ′
ya）A
yr
y〕 (Sinπα)/(π)
Calculate and get.Experiment value and theoretical value relatively list in table 1.
This shows that the calculated value of ultimate bending moment and test value are very approaching.Because prestressed concrete pile mainly is used as the basis of building and structure, the axial load carrying capacity of stake own is one of its important performance, for the manufacturing process of check stake, utilizes three diameter D=500 equally in test room
Mm, length L=3.5m, concrete design compressive strength is 800kg/cm
2, do the axial load carrying capacity test of stake.Its result of the test rupture load is 800 tons.The supporting capacity calculated value is according to the TJ10-74 modular formula:
N
p=φ (R
aA+ σ '
YaA
y')=798.5 tons
As seen, supporting capacity calculated value and test value extremely are close.Prove that from domestic and international a large amount of practical experiences generally allow the service load of the used stake of this test to be not more than 160 tons, the safety factor of this stake that hence one can see that is 5 times.
Utilize the splicing of the large-diameter tubular pile that the present invention produces, replace the cast stake with the form of imbedding stake, its construction sequence is, earlier with mechanical borehole or punching, and the diameter of its borehole or punching otherwise greater than the pile tube diameter of pressing designing requirement, after waiting to be deep into the building-in depth of bearing stratum requirement, squeeze into pile tube by the designing requirement cross section with pile driver, the splicing while imbedding is until reaching projected depth, if desired, can be in the pile tube hollow hole backfill sandy gravel.The purpose of this job practices is in order to solve the problem that site operation occurs.One, the impact force that can reduce to drive piles, thus reduce noise; Its two, solve in the city the intensive situation of building or because the overstocked situation of requirement of engineering foundation pile, for reduce stake and existing building or stake and between the destruction of causing because of extruding force is excessive.
Manufacturing process provided by the present invention, method is simple, is convenient to operation, is applicable to produced on-site, reduces product cost.Because the concrete strength height, the penetrating force of stake is strong, and the method for attachment between stake and the stake is simple and reliable, adds different length and diameter, can be suitable for the needs of different engineerings.
Fig. 1 is the constructional drawing of prestressed concrete pile.Among the figure: (1) prestressed concrete pile; (2) tension reinforcing steel bar; (3) spiral stirrup; (4) anchor rod; (5) steel hoop; (6) anchor disc of steel hoop.
Fig. 2 (a) is the joint construction figure of stake (1) and steel hoop (5); Fig. 2 (b) is the joint construction figure of steel hoop (5) and anchor rod; Fig. 2 (c) is the amplification constructional drawing of the reservation groove (7) of anchor disc.
Embodiments of the invention: table 2 is the design mixture proportion of three kinds of high-strength concretes.Table 3 is the concrete data and the size of tension reinforcing steel bar, spiral stirrup, steel hoop, anchor disc and the reservation groove of three kinds of pile tube diameters.
Claims (4)
1, a kind of by centrifugal forming and stream curing and the prestressed concrete foundation pile that constitutes it is characterized in that:
(1) concrete design mixture proportion:
Cement 450kg/M
3-600kg/M
3
Sand coarse aggregate ratio 0.27-0.35
Water/binder ratio 0.28-0.36
Water reducing agent (accounting for cement consumption) 0.5-2%,
(2) centrifuge speed change centrifugal forming, its rotating speed are 300-1000 rev/min,
(3) maintenance:
A maintenance, temperature 60-80 ℃, time 5-9 hour,
The secondary maintenance, steam curing at high pressure, 180 ℃-200 ℃ of temperature, time 5-8 hour, curing in water, 20 ℃-25 ℃ of temperature, time 12-16 days,
(4) stake (1) comprises that one group is cast in concrete tension reinforcing steel bar [2] and one group of anchor rod (4) in order to spud pile (1) and steel hoop (5);
(5) anchor rod (4) is distributed in two ends of stake (1), and its length is 40 centimetres, and diameter is 12 millimeters.
(6) tension reinforcing steel bar (1) is to fix with the heading tension mode with anchor disc (6).
2, foundation pile according to claim 1 is characterized in that mixing a kind of water reducing agent of powdery.
3, a kind of by centrifugal forming and stream curing and the job practices of the prestressed concrete foundation pile that constitutes it is characterized in that:
(1) mechanical borehole or punching, its diameter are not more than the diameter of stake,
(2) mud off,
(3) wait to be deep into the building-in depth of bearing stratum requirement after, squeeze into pile tube by the designing requirement cross section, the splicing while squeezing into, until reaching projected depth,
(4) being connected between stake and the stake is to reserve groove (7) in anchor disc to locate electric welding, and scolder fills up reservation groove (7).
4, according to the described foundation pile of claim 1-3, the concrete crushing strength that it is characterized in that foundation pile is 600kg/cm
2-1000kg/cm
2
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 85108550 CN85108550A (en) | 1985-11-30 | 1985-11-30 | Prestressed concrete foundation pile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 85108550 CN85108550A (en) | 1985-11-30 | 1985-11-30 | Prestressed concrete foundation pile |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN85108550A true CN85108550A (en) | 1987-06-03 |
Family
ID=4796067
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 85108550 Withdrawn CN85108550A (en) | 1985-11-30 | 1985-11-30 | Prestressed concrete foundation pile |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN85108550A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009076858A1 (en) * | 2007-12-14 | 2009-06-25 | Jiangwei Xue | Pile with hoop |
| CN100560318C (en) * | 2006-01-05 | 2009-11-18 | 姜中云 | A kind of high-bearing capacity prestressed tubular pile and production method thereof |
| CN101962280A (en) * | 2010-09-20 | 2011-02-02 | 中交第一航务工程局有限公司 | Prestress high-strength concrete tubular pile |
| CN101164754B (en) * | 2006-10-18 | 2011-03-16 | 润弘精密工程事业股份有限公司 | Dry stirring light compartment wall grouting material |
| CN102373710A (en) * | 2011-02-23 | 2012-03-14 | 上海城地建设发展有限公司 | Enclosing method for inserting pre-stressed centrifugal pipe pile (square pile) into three-axis (two-axis) cement mixing pile |
| CN102757205A (en) * | 2012-08-07 | 2012-10-31 | 广东华美鑫通混凝土构件有限公司 | Pretensioned prestressed high strength concrete and production method of pretensioned prestressed high strength concrete tubular pile |
| CN103538145A (en) * | 2013-10-24 | 2014-01-29 | 华煜建设集团有限公司 | Long-tube-section precast concrete pile construction method |
-
1985
- 1985-11-30 CN CN 85108550 patent/CN85108550A/en not_active Withdrawn
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100560318C (en) * | 2006-01-05 | 2009-11-18 | 姜中云 | A kind of high-bearing capacity prestressed tubular pile and production method thereof |
| CN101164754B (en) * | 2006-10-18 | 2011-03-16 | 润弘精密工程事业股份有限公司 | Dry stirring light compartment wall grouting material |
| WO2009076858A1 (en) * | 2007-12-14 | 2009-06-25 | Jiangwei Xue | Pile with hoop |
| CN101962280A (en) * | 2010-09-20 | 2011-02-02 | 中交第一航务工程局有限公司 | Prestress high-strength concrete tubular pile |
| CN101962280B (en) * | 2010-09-20 | 2014-02-05 | 中交第一航务工程局有限公司 | Prestress high-strength concrete tubular pile |
| CN102373710A (en) * | 2011-02-23 | 2012-03-14 | 上海城地建设发展有限公司 | Enclosing method for inserting pre-stressed centrifugal pipe pile (square pile) into three-axis (two-axis) cement mixing pile |
| CN102757205A (en) * | 2012-08-07 | 2012-10-31 | 广东华美鑫通混凝土构件有限公司 | Pretensioned prestressed high strength concrete and production method of pretensioned prestressed high strength concrete tubular pile |
| CN103538145A (en) * | 2013-10-24 | 2014-01-29 | 华煜建设集团有限公司 | Long-tube-section precast concrete pile construction method |
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|---|---|---|---|
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| WW01 | Invention patent application withdrawn after publication |