CN1799802A - High-bearing capacity prestressed tubular pile and its production method - Google Patents
High-bearing capacity prestressed tubular pile and its production method Download PDFInfo
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- CN1799802A CN1799802A CN 200610010620 CN200610010620A CN1799802A CN 1799802 A CN1799802 A CN 1799802A CN 200610010620 CN200610010620 CN 200610010620 CN 200610010620 A CN200610010620 A CN 200610010620A CN 1799802 A CN1799802 A CN 1799802A
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Abstract
The invention discloses a high bearing capacity prestressed pipe pile and relative producing method. The invention can overcome the thickness limit of wall of present technique via a plurality of filling and de-centering concrete to produce practical pipe pile even sincere post. With the increase of wall thickness of post, the forced surface of pipe pile and the structure mechanical property are improved. The tests prove that: the bearing ability of single post is improved significantly, with strong penetrate ability to rigid stratum and reduced post-explosion condition. The invention has simple process, reliable quality, and better market prospect.
Description
Technical field
The invention belongs to construction engineering technical field, be specifically related to a kind of high-bearing capacity prestressed tubular pile and production method thereof.
Background technology
In building construction process, the utilization pile tube is constructed and Ground Treatment is a kind of comparatively ripe foundation basic construction technology of present stage.Its employed prestressed concrete pipe pile is by fill concrete in prefabricated steel reinforcement cage, and through technology such as centrifugal, steam-cured and make.This series products in the market mainly contains: PTC prestress thin wall pile tube (strength grade of concrete: C60, wall thickness are with respect to the low 20mm of PC type pile tube), PC pile for prestressed pipe (strength grade of concrete: C60) with PHC prestressed high-strength pile tube (strength grade of concrete: C80) three types.Owing to adopt traditional once filling, a centrifugation technique, the wall thickness limit of these products can only reach 27%～50% of whole stake radius, also has very big hollow position (referring to table 1) in the stake.Because its stressed cross-sectional area is little, so the bearing capacity poor-performing of single pile structure correspondence is not ideal enough to the penetration power of hardpan in the piling process, the quick-fried stake situation that causes because of minimum construction deviation is comparatively general.Simultaneously,, in order to satisfy high tonnage carrying designing requirement, often need to use many multi-column pier foundations of cushion caps altogether in the construction, increased the weight of the expense of bearing platform construction, cause that construction cost is too high, waste is excessive owing to be subjected to the restriction of single pile bearing capacity.Therefore, how to improve the single pile bearing capacity of prestressed concrete pipe pile, reduce construction cost, just become the technical problem that needs to be resolved hurrily in the prior art.
Summary of the invention
The objective of the invention is at the deficiencies in the prior art, a kind of pile for prestressed pipe and production method thereof with high-bearing capacity is provided.By repeatedly filling, repeatedly centrifugal, improve the wall thickness of pile tube, thereby effectively improve the stressed cross-sectional area of single pile, make it have stronger bearing capacity, stratum penetration capacity and whole uniformity.
Purpose of the present invention is achieved by the following technical programs.
The invention provides a kind of high-bearing capacity prestressed tubular pile, this pile tube is prepared by following method: make steel reinforcement cage and connect end plate, and put into punching block, the concrete inserts that will meet national pile tube preparation standard injects punching block equably with drawing-in device, the capping punching block; Punching block is placed on the centrifuge, carry out centrifugally, topple over surplus slurry after finishing; Implementing plug in the punching block bottom handles; Pile tube is carried out secondary fill out the heart; The punching block of filling out behind the heart places on the centrifuge once more, carries out centrifugally, topples over surplus slurry after finishing; Repeat to fill out the heart and centrifugal, until reaching the wall thickness requirement; Require to carry out steam-cured according to strength grade of concrete; The demoulding, go out to put into after the stake and stack, carry out natural curing.
High-bearing capacity prestressed tubular pile provided by the present invention also can be prepared by following method: make steel reinforcement cage and connect end plate, and put into punching block, the concrete inserts that will meet national pile tube preparation standard injects punching block equably with drawing-in device, the capping punching block; Punching block is placed on the centrifuge, carry out centrifugally, topple over surplus slurry after finishing; Implementing plug in the punching block bottom handles; Pile tube is carried out secondary fill out the heart; The punching block of filling out behind the heart places on the centrifuge, carries out centrifugally, topples over surplus slurry after finishing; Require to carry out steam-cured according to strength grade of concrete; Repeat to fill out the heart, centrifugal and steam-cured, up to reaching the wall thickness requirement; The demoulding, go out to put into after the stake and stack, carry out natural curing.
Described steam-cured be the steam-cured or high-pressure steaming and cultivating of normal pressure.
The present invention also provides a kind of production method of high-bearing capacity prestressed tubular pile, and this method adopts following steps:
1. make steel reinforcement cage and connect end plate, and put into punching block, the concrete inserts that will meet national pile tube preparation standard injects punching block equably with drawing-in device, the capping punching block;
2. punching block is placed on the centrifuge, carry out centrifugally, topple over surplus slurry after finishing;
3. implement plug handles in the punching block bottom;
4. carry out secondary and fill out the heart;
5. punching block is placed on the centrifuge, carry out centrifugally, topple over surplus slurry after finishing;
6. repeat step 4,5, up to reaching the wall thickness requirement;
7. punching block is placed steam-cured pond, undertaken steam-cured by the strength grade of concrete requirement;
8. the demoulding, go out to put into after the stake and stack, carry out natural curing.
Pile tube production method provided by the present invention, can also adopt following steps:
1. make steel reinforcement cage and connect end plate, and put into punching block, the concrete inserts that will meet national pile tube preparation standard injects punching block equably with drawing-in device, the capping punching block;
2. punching block is placed on the centrifuge, carry out centrifugally, topple over surplus slurry after finishing;
3. implement plug handles in the punching block bottom;
4. carry out secondary and fill out the heart;
5. punching block is placed on the centrifuge, carry out centrifugally, topple over surplus slurry after finishing;
6. punching block is placed steam-cured pond, require to carry out steam-cured according to strength grade of concrete;
7. repeat step 4,5 and 6, up to reaching the wall thickness requirement;
8. the demoulding, go out to put into after the stake and stack, carry out natural curing.
Described steam-cured be the steam-cured or high-pressure steaming and cultivating of normal pressure.
The present invention has broken through the wall thickness limit that present pile for prestressed pipe production technology can reach, and has produced the heavy wall stake with real meaning, and even solid pile (seeing Table 1).Along with increasing considerably of pile tube wall thickness, the lifting surface area of pile tube is improved, and its structural mechanical property is significantly promoted (seeing Table 2).Simultaneously, the present invention is combining with theoretical analysis and experimental summary also, has provided the structural limits intensity level of its wall thickness change of this type pile tube, thereby provides a kind of value according to (seeing Table 2) for the actual design construction.Test shows, hyper-thick pipe of the present invention and solid pile tube (Pretesioned Spun Super Thick Wall or SolidCenter Super Stregth Concrete Piles, hereinafter to be referred as the PSSC stake), single pile bearing capacity improves a lot, hardpan is had stronger penetration capacity, and the situation that occurs quick-fried stake in the construction greatly reduces.Easy, the reliable in quality of its technology has better market prospect.
The similar pile tube wall thickness of table 1 parameter comparison table
| Pile tube diameter (mm) | PHC stake limit wall thickness (mm) | PC stake limit wall thickness (mm) | PSSC pile tube wall thickness (mm) |
| 300 | 80 | 80 | 80～solid |
| 400 | 105 | 105 | 110～solid |
| 500 | 140 | 140 | 140～solid |
| 550 | 140 | 140 | 140～solid |
| 600 | 150 | 150 | 150～solid |
| 800 | 130 | - | 130～solid |
As can be seen from Table 1, adopt traditional once fill, pile tube that centrifugation technique is produced owing to be subjected to the restriction of production technology, its wall thickness can only arrive an extreme position, can not freely reach heavy wall and even solid.Thereby cause the stressed cross-sectional area of pile tube not to be fully used, have very big hollow region in the stake, on pile tube uses, have very big shortcoming.And adopt repeatedly fill, the PSSC pile tube produced of centrifugation technique repeatedly, its wall thickness can freely be controlled as required, even can reach solid.The increase of the stressed cross-sectional area of pile tube has effectively improved the whole uniformity of single pile bearing capacity and pile tube, embodies the intrinsic advantage of pile for prestressed pipe more fully.
The corresponding ultimate bearing capacity value of table 2 PSSC type tube pile structure table
| Pile tube diameter (mm) | Strength grade of concrete | Wall thickness (mm) | R(kN) |
| 300 | C60 | 90 | 1800 |
| 120 | 2000 |
| Solid | 2100 | ||
| C80 | 90 | 2300 | |
| 120 | 2700 | ||
| Solid | 2800 | ||
| 400 | C60 | 110 | 3000 |
| 150 | 3600 | ||
| Solid | 3800 | ||
| C80 | 110 | 4000 | |
| 150 | 4700 | ||
| Solid | 5000 | ||
| 500 | C60 | 140 | 4800 |
| 200 | 5800 | ||
| Solid | 6000 | ||
| C80 | 140 | 6300 | |
| 200 | 7500 | ||
| Solid | 7800 | ||
| 550 | C60 | 140 | 5500 |
| 200 | 6700 | ||
| Solid | 7300 | ||
| C80 | 140 | 7200 | |
| 200 | 8000 | ||
| Solid | 9500 | ||
| 600 | C60 | 150 | 6500 |
| 200 | 7700 | ||
| Solid | 8700 | ||
| C80 | 150 | 8500 | |
| 200 | 10000 | ||
| Solid | 11000 | ||
| 800 | C80 | 150 | 12000 |
| 300 | 18000 | ||
| Solid | 20000 |
Wherein: R=0.8*A*f
Ck
R-tube pile structure ultimate strength value
f
Ck-characteristic value of concrete compressive strength
0.8 be service factor
The effective stressed cross-sectional area of A-pile tube
As can be seen from Table 2, through repeatedly filling, the repeatedly PSSC stake of centrifugal production, along with the increase of wall thickness, its structural limits intensity is also along with increase.
The specific embodiment
By specific embodiment given below, can further be well understood to the present invention, but they not limitation of the invention.
Embodiment 1
Produce 10 PSSC-AB Φ 400 (150, C60) pile tube is pressed earlier the national regulation technological requirement of PC-AB Φ 400 (95) pile tubes and is made steel reinforcement cage and connect end plate, and puts into punching block, concrete (seeing Table 3) is injected punching block equably with feeding machine, the capping punching block; Punching block is placed on the centrifuge, carry out centrifugal (seeing Table 5), topple over surplus slurry after finishing; Punching block is tiltedly put into steam-cured pond with 15 ° angle of inclination,, carry out plug in the bottom and handle for the concrete that prevents to pour into runs off, select the rubble specification to be≤25mm, the grain fineness number modulus is 2.6, and the concrete of the ratio of mud 0.28 carries out back-grouting (seeing Table 4), and the amount of perfusion is every meter 0.029m
3, concrete compactness is 1.1; Punching block is placed on the centrifuge, carry out centrifugal (seeing Table 5), topple over surplus slurry (wall thickness sees Table 7) after finishing; After punching block placed the steam-cured 6h of steam-cured pond normal pressure, go out the pond; The demoulding, go out to put into after the stake and stack, carry out natural curing 28d.Finished product PSSC structural limits intensity level sees Table 6.
Table 3 10PC-AB Φ 400 (95) pile tube technology concrete mixs
| Cement | Rubble | Sand | Mechanism sand | Water reducer | Water |
| 500 | 1390 | 300 | 300 | 20 | 130 |
Table 4 PSSC-AB Φ 400 (150) pile tubes are filled out heart concrete proportioning
| Cement | Rubble | Sand | Mechanism sand | Water reducer | Water |
| 500 | 350 | 500 | 300 | 16 | 100 |
The time of the centrifugal making of table 5 and speed
| Low speed | Middling speed | High speed | At a high speed | ||||
| Time (h) | Frequency (Hz) | Time (h) | Frequency (Hz) | Time (h) | Frequency (Hz) | Time (h) | Frequency (Hz) |
| 3.5 | 7.28 | 3 | 16.09 | 3 | 28.77 | 6 | 43.56 |
Table 6 PSSC structural limits intensity
| The stake numbering | 1 # | 2 # | 3 # | 4 # | 5 # | 6 # | 7 # | 8 # | 9 # | 10 # |
| R(kN) | 3626 | 3606 | 3645 | 3626 | 3626 | 3645 | 3626 | 3626 | 3626 | 3626 |
Table 7 PSSC stake wall thickness value
| The stake numbering | Stake diameter (mm) | Strength grade of concrete | Wall thickness (mm) |
| 1 # | 400 | C60 | 150 |
| 2 # | 400 | C60 | 148 |
| 3 # | 400 | C60 | 152 |
| 4 # | 400 | C60 | 150 |
| 5 # | 400 | C60 | 150 |
| 6 # | 400 | C60 | 152 |
| 7 # | 400 | C60 | 150 |
| 8 # | 400 | C60 | 150 |
| 9 # | 400 | C60 | 150 |
| 10 # | 400 | C60 | 150 |
This 10 pile according to the site needs, is called in 6 at random and is carried out on-the-spot test pile, utilizes static pressure pile-sinking technology, and the result adds up force value above behind the 3600kN, and pile body is complete, quick-fried stake situation do not occur, wherein has 2, even reaches more than the 4000kN.
Embodiment 2
Repeat embodiment 1, following difference is arranged: produce PSSC400-110 (C60) pile tube, it is 0.01m that secondary is filled out heart amount
3/ m, experimental data wall thickness and structural limits bearing capacity all reach designing requirement as a result.
Embodiment 3
Repeat embodiment 1, following difference is arranged: produce PSSC400-200 (C60) pile tube, it is 0.03m that secondary is filled out heart amount
3/ m, after the secondary centrifuging, wall thickness is 170mm; Fill out the heart once more, filling out heart amount is 0.003m
3/ m, wall thickness reach 200 (promptly solid), and experimental data wall thickness and structural limits bearing capacity all reach designing requirement as a result.
Embodiment 4
According to the national regulation standard, the required concrete of proportioning PHC400-95 pile tube is produced preparation.Produce PSSC400-200 (C80) pile tube then, it is 0.03m that secondary is filled out heart amount
3/ m carries out secondary centrifuging, and puts into steam-cured pond and carried out normal pressure steam-cured 10 hours, and wall thickness is 170mm, and strength grade of concrete is C60; Fill out the heart once more, filling out heart amount is 0.003m
3/ m, it is steam-cured to carry out centrifugal and normal pressure then, and wall thickness is 200mm, puts into the high-pressure steaming and cultivating still at last and carried out high-pressure steaming and cultivating 13 hours, pressure 14MPa, experimental data wall thickness and structural limits bearing capacity all reach designing requirement as a result.
Claims (6)
1, a kind of high-bearing capacity prestressed tubular pile, this pile tube is prepared by following method: make steel reinforcement cage and connect end plate, and put into punching block, the concrete inserts that will meet national pile tube preparation standard injects punching block equably with drawing-in device, the capping punching block; Punching block is placed on the centrifuge, carry out centrifugally, topple over surplus slurry after finishing; Implementing plug in the punching block bottom handles; Pile tube is carried out secondary fill out the heart; The punching block of filling out behind the heart places on the centrifuge once more, carries out centrifugally, topples over surplus slurry after finishing; Repeat to fill out the heart and centrifugal, until reaching the wall thickness requirement; Require to carry out steam-cured according to strength grade of concrete; The demoulding, go out to put into after the stake and stack, carry out natural curing.
2, a kind of high-bearing capacity prestressed tubular pile, this pile tube is prepared by following method: make steel reinforcement cage and connect end plate, and put into punching block, the concrete inserts that will meet national pile tube preparation standard injects punching block equably with drawing-in device, the capping punching block; Punching block is placed on the centrifuge, carry out centrifugally, topple over surplus slurry after finishing; Implementing plug in the punching block bottom handles; Pile tube is carried out secondary fill out the heart; The punching block of filling out behind the heart places on the centrifuge, carries out centrifugally, topples over surplus slurry after finishing; Require to carry out steam-cured according to strength grade of concrete; Repeat to fill out the heart, centrifugal and steam-cured, until reaching the wall thickness requirement; The demoulding, go out to put into after the stake and stack, carry out natural curing.
3, pile for prestressed pipe according to claim 1 and 2 is characterized in that: the described steam-cured steam-cured or high-pressure steaming and cultivating of normal pressure that is.
4, the production method of the described high-bearing capacity prestressed tubular pile of claim 1, this method adopts following steps:
1. make steel reinforcement cage and connect end plate, and put into punching block, the concrete inserts that will meet national pile tube preparation standard injects punching block equably with drawing-in device, the capping punching block;
2. punching block is placed on the centrifuge, carry out centrifugally, topple over surplus slurry after finishing;
3. implement plug handles in the punching block bottom;
4. carry out secondary and fill out the heart;
5. punching block is placed on the centrifuge, carry out centrifugally, topple over surplus slurry after finishing;
6. repeat step 4,5, up to reaching the wall thickness requirement;
7. punching block is placed steam-cured pond, undertaken steam-cured by the strength grade of concrete requirement;
8. the demoulding, go out to put into after the stake and stack, carry out natural curing.
5, the production method of the described high-bearing capacity prestressed tubular pile of claim 2, this method adopts following steps:
1. make steel reinforcement cage and connect end plate, and put into punching block, the concrete inserts that will meet national pile tube preparation standard injects punching block equably with drawing-in device, the capping punching block;
2. punching block is placed on the centrifuge, carry out centrifugally, topple over surplus slurry after finishing;
3. implement plug handles in the punching block bottom;
4. carry out secondary and fill out the heart;
5. punching block is placed on the centrifuge, carry out centrifugally, topple over surplus slurry after finishing;
6. punching block is placed steam-cured pond, require to carry out steam-cured according to strength grade of concrete;
7. repeat step 4,5 and 6, up to reaching the wall thickness requirement;
8. the demoulding, go out to put into after the stake and stack, carry out natural curing.
6, according to claim 4 or 5 described pile for prestressed pipe, it is characterized in that: the described steam-cured steam-cured or high-pressure steaming and cultivating of normal pressure that is.
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| CNB2006100106209A CN100560318C (en) | 2006-01-05 | 2006-01-05 | A kind of high-bearing capacity prestressed tubular pile and production method thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101041964B (en) * | 2007-04-11 | 2010-05-26 | 华丰建设股份有限公司 | Method for producing pretensioned prestressing concrete shape tube pile |
| CN102275219A (en) * | 2011-08-18 | 2011-12-14 | 广东建华管桩有限公司 | Automatic production line for pipe pile |
| CN102337742A (en) * | 2011-07-26 | 2012-02-01 | 杭州固华复合材料科技有限公司 | Prestressed composite superimposed large-diameter tube pile and manufacturing method thereof |
| CN101885208B (en) * | 2009-09-21 | 2012-09-05 | 宁波一中管桩有限公司 | System for manufacturing novel high-efficiency, energy-saving and environmentally-friendly centrifugal concrete pile |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85108550A (en) * | 1985-11-30 | 1987-06-03 | 清华大学 | Prestressed concrete foundation pile |
| CN2387146Y (en) * | 1999-09-17 | 2000-07-12 | 铁道部科学研究院铁道建筑研究所 | Thin wall and light weight tubular pile |
| CN1560380B (en) * | 2004-02-27 | 2010-11-03 | 胡柏英 | Precast reinforced concrete tubular pile |
-
2006
- 2006-01-05 CN CNB2006100106209A patent/CN100560318C/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101041964B (en) * | 2007-04-11 | 2010-05-26 | 华丰建设股份有限公司 | Method for producing pretensioned prestressing concrete shape tube pile |
| CN101885208B (en) * | 2009-09-21 | 2012-09-05 | 宁波一中管桩有限公司 | System for manufacturing novel high-efficiency, energy-saving and environmentally-friendly centrifugal concrete pile |
| CN102337742A (en) * | 2011-07-26 | 2012-02-01 | 杭州固华复合材料科技有限公司 | Prestressed composite superimposed large-diameter tube pile and manufacturing method thereof |
| CN102275219A (en) * | 2011-08-18 | 2011-12-14 | 广东建华管桩有限公司 | Automatic production line for pipe pile |
| CN102275219B (en) * | 2011-08-18 | 2012-10-31 | 广东建华管桩有限公司 | Automatic production line for pipe pile |
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| Publication number | Publication date |
|---|---|
| CN100560318C (en) | 2009-11-18 |
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Assignee: Jiang Zhongyun Assignor: Yunnan Dong Yu Industry & Trade Co., Ltd. Contract record no.: 2010530000062 Denomination of invention: High-bearing capacity prestressed tubular pile and its production method Granted publication date: 20091118 License type: Exclusive License Open date: 20060712 Record date: 20101103 |
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Assignee: Yunnan Dong Yu Industry & Trade Co., Ltd. Assignor: Jiang Zhongyun Contract record no.: 2010530000062 Denomination of invention: High-bearing capacity prestressed tubular pile and its production method Granted publication date: 20091118 License type: Exclusive License Open date: 20060712 Record date: 20101103 |