CN101397787A - Mixed pile-forming method of prefabricated pile body - Google Patents
Mixed pile-forming method of prefabricated pile body Download PDFInfo
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- CN101397787A CN101397787A CNA2007101572474A CN200710157247A CN101397787A CN 101397787 A CN101397787 A CN 101397787A CN A2007101572474 A CNA2007101572474 A CN A2007101572474A CN 200710157247 A CN200710157247 A CN 200710157247A CN 101397787 A CN101397787 A CN 101397787A
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Abstract
The invention relates to a construction method for building pile foundation engineering, in particular to a mixing pile forming method of a precast pile body, which is the preferred construction method of a multi-stage base large-bearing-capacity pile. The pile forming method of the invention comprises the following process steps: an immersed tube with a metal pile head is sunk to a hard soil layer for designing elevation; the metal pile head is drawn out; a lower base space is formed and kept free from remained fine earth; a lower base is cast; a precast pile body and dowels are put into and anchored with the lower base; the immersed tube is pulled upward to a preset height H; an upper base space is formed and kept free from remained fine earth; steel bars are put into from opening of the immersed tube and extended into the upper part of a lower recast hollow pile body, and flowing concrete is used for casting the upper base and casting the upper pile body of reinforced concrete in place; and the immersed tube is pulled out, and concrete slurry is injected into the gap. The construction method has the advantages that: the bearing capacity and the reduction factor of a single pile are enhanced, the utilization rate of the material strength is improved, and the construction method is safe and stable, and the construction cost of the pile base is reduced, therefore, the designed expected effect is reached.
Description
Technical field
The present invention relates to the mixed pile-forming method of a kind of construction of building pile foundation engineering, particularly a kind of precast pile.It is the job practices of the big bearing peg first-selection of multistage base.
Background technology
According to the national regulation whole body be cast-in-place (be the pile body Cast-in-place concrete, base also is a Cast-in-place concrete) its base diameter ratio maximum value of expanded bore pile is limited in 3-3.5, and pipe sinking prefabricated steel concrete club-footed pile, this stake is the prefabricated concrete of pile body, the base Cast-in-place concrete, obviously this ratio 3-3.5 is broken, generally 3.5-5 can be reached,, requirement of engineering can't be satisfied although bearing capacity is bigger, particularly, the opposite end bearing capacity to give a discount 0.9 when bellout diameter during greater than 1.5 meters.For this reason, immersed tube prefabricated multistage under-reamed pile has appearred again.Existing multiple bearing capacity dish stake technology has two common ground, and first all is to expand the end with positive crossover-circulating type method pore-forming; Second all carries out pile without immersed tube expands the end.This two point-to-points load dish (at the bottom of the multistage expansion) stake is quite unfavorable, in other words, bring two problems, 1), national building code requirement, expand the base end load at the end with positive crossover-circulating type method pile and will take advantage of 0.45 coefficient, because have mud existence and pile bottom sediment to clean out, (Zhejiang Province's standard is 0.24 discount) gives a discount too big, though a plurality of bases are arranged, loss end load is very big; 2); without immersed tube; condition of construction can not get protection; positive in addition crossover-circulating type method is operation under water; expand bottom application worker situation and cannot see, the difficult measurement noted down, when also usually taking place to expand the end under water; top soil body a slice situation that falls down also happens occasionally; also have because the multistage stake of prior art all is the whole body Cast-in-place concrete, and that the intensity of Cast-in-place concrete is done is not high, and difficult quality guarantee; and in water, water concrete; the difficult control of quality adds that the pile capacity of a plurality of bases is all bigger, and its pile body diameter of above factor must be done greatlyyer; and this a plurality of base is afraid of that pile body diameter is big most; development test shows that pile body diameter increases, and its bearing capacity decay is very serious.
Summary of the invention
The present invention is directed to problem that prior art exists provide a kind of mixed pile-forming method of precast pile, purpose be make that bearing capacity of single pile is big, strength of materials utilization rate height, reduction coefficient height, safe and reliable, guarantee the pile foundation engineering quality, reduce cost, technology is reasonable.
The mixed pile-forming method of precast pile of the present invention comprises following processing step: a, the immersed tube that has metal pile head is sunk to the hardpan design elevation; B, taking-up metal pile head; C, put into oil emulsion or tnt explosive from the immersed tube mouth, every 0.5m
3Consumption is 1-5 kilograms, seals the immersed tube mouth behind the ignition charge, treat that explosive charge is finished after, open the article of sealing the immersed tube mouth and get clean hack, expand the end with mechanical bottom-expanding equipment and form lower base space, and get clean hack, keep the noresidue hack; D, cast lower bottom base; E, put into down precast pile, joint bar and lower bottom base is anchored; F, on pull out immersed tube to the distance H of setting; G, expand the end with mechanical bottom-expanding equipment and form upper base space, and get clean hack, keep the noresidue hack; H, put into the concrete cast upper bed-plate that flows, will put into upper bed-plate with the last precast pile of joint bar again and be anchored from the immersed tube mouth; I, extract immersed tube, and between the slit, inject cement paste.
The mixed pile-forming method of precast pile comprises following processing step: a, the immersed tube that has metal pile head is sunk to the hardpan design elevation; B, taking-up metal pile head; C, put into oil emulsion or tnt explosive from the immersed tube mouth, every 0.5m
3Consumption is 1-5 kilograms, seals the immersed tube mouth behind the ignition charge, treat that explosive charge is finished after, open the article of sealing the immersed tube mouth and get clean hack, expand the end with mechanical bottom-expanding equipment and form lower base space, and get clean hack, keep the noresidue hack; D, cast lower bottom base; E, put into down precast pile, joint bar and lower bottom base is anchored; F, on pull out immersed tube to the distance H of setting; G, put into oil emulsion or tnt explosive from the immersed tube mouth, every 0.5m
3Consumption is 1-5 kilograms, seals the immersed tube mouth behind the ignition charge, treat that explosive charge is finished after, open the article of sealing the immersed tube mouth, expand the end with mechanical bottom-expanding equipment again and form upper base space, and get clean hack, keep the noresidue hack; H, put into the top that reinforcing bar 7 extends into down the precast hollow pile body, with pile body 5 on flow concrete cast upper bed-plate and the cast-in-situ steel concrete from the immersed tube mouth; I, extract immersed tube, and between the slit, inject cement paste.
It is as follows that the mechanical bottom-expanding equipment expansion of usefulness among described operation c and the g end forms the lower base space concrete steps: take out metal pile head, the mark that the detent rail pin of bottom-expanding equipment is aimed on the immersed tube mouth is lowered to immersed tube, start equipment after the equipment upper end is also fixedly positioning and expand the end, expand the end and be vertical earlier expand the end again level expand the end, when reaching, construction stops automatically after design is marked deeply, base cavity pocket is formed on the bottom, expanding the work of undercutting sharpener this moment reaches when designing base diameter, be that power rail reaches predetermined number of revolutions, expand end shoveling and finish, bottom-expanding equipment is hung out ground.
Getting clean hack among described operation c and the g is to get the hack that is dug down only with inhaling indigenous equipment or mixing method.
The concrete steps that described mixing method is got the hack that is dug down only are as follows: inhale indigenous equipment with air and fetch earth, when only surplus a small amount of loosing during soil in the base, from immersed tube mouth pouring, pouring limit, limit sops up, and is clean up to fetching earth.
Distance H among the described operation f is 2-10 a times of base diameter.
It is a kind of in precast hollow pile body and the solid precast pile or both combinations that following in described e and the h operation gone up precast pile.
The present invention is compared with prior art owing to changed traditional piling method; do protection and support with immersed tube; rationally arrange operation to eliminate the defective of existing piling method effectively in addition; and significantly improve the supporting capacity and the reduction coefficient of single pile through evidence; improved the utilization rate of the strength of materials; and safe and reliable, reduce the pile foundation engineering cost, reached the Expected Results of design.
Description of drawings
Fig. 1 a-1g is the construction view of each operation process of the present invention.
The construction view of the master operation of Fig. 2 embodiment 2.
Among the figure 1, lower base space; 2, immersed tube; 3, following precast pile; 4, go up precast pile; 5, pile body on the cast-in-place notes; 6, joint bar; 7, reinforcing bar; 8, upper base space.
The specific embodiment
Embodiment 1:
Embodiments of the invention 1a-1g in conjunction with the accompanying drawings are described in detail.
The mixed pile-forming method of precast pile of the present invention comprises following processing step: a, the immersed tube 2 that has metal pile head is sunk to hardpan to design elevation; B, taking-up metal pile head; C, put into oil emulsion or tnt explosive from the immersed tube mouth, every 0.5m
3Consumption is 1-5 kilograms, seals the immersed tube mouth behind the ignition charge, treat that explosive charge is finished after, open the article of sealing the immersed tube mouth and get clean hack, expand the end with mechanical bottom-expanding equipment and form lower base space 1, hack is got hack only with the suction indigenous equipment; D, pour in the immersed tube 2 or hang in the concrete cast lower bottom base that flows with barreled; E, put into down precast pile 3, joint bar and lower bottom base are anchored; F, on pull out immersed tube 2 to the distance H of setting, its H be base diameter 2-10 doubly, its value size depends on that what of base progression are relevant with the pile body height; G, expand the end with mechanical bottom-expanding equipment and form upper base space 8, hack is got hack only with the suction indigenous equipment, and following precast pile 3 is that its hollow hack falls in the hollow preformed pile body and needn't clear up; H, put into the concrete cast upper bed-plate that flows from 2 mouthfuls of immersed tube, the solid precast pile 4 of going up that will have joint bar 6 is again put into upper bed-plate and is anchored; I, extract immersed tube 2, in the slit, inject cement paste.
It is as follows that the mechanical bottom-expanding equipment expansion of usefulness among described operation c and the g end forms the lower base space concrete steps: take out metal pile head, the mark that the detent rail pin of bottom-expanding equipment is aimed on the immersed tube mouth is lowered to immersed tube, start equipment after the equipment upper end is also fixedly positioning and expand the end, expand the end and be vertical earlier expand the end again level expand the end, when reaching, construction stops automatically after design is marked deeply, base cavity pocket is formed on the bottom, expanding the work of undercutting sharpener this moment reaches when designing base diameter, be that power rail reaches predetermined number of revolutions, expand end shoveling and finish, bottom-expanding equipment is hung out ground.
Getting clean hack among above-mentioned operation c and the g is to get the hack that is dug down only with inhaling indigenous equipment or mixing method.Wherein to get the concrete steps of the hack that is dug down only as follows for mixing method: inhale indigenous equipment with air and fetch earth, when only surplus a small amount of loosing during soil in the base, from immersed tube mouth pouring, pouring limit, limit sops up, and is clean up to fetching earth.
Embodiment 2:
Its operation a to f is identical with embodiment 1, and operation is g, puts into oil emulsion or tnt explosive from the immersed tube mouth, every 0.5m
3Consumption is 1-5 kilograms, seals the immersed tube mouth behind the ignition charge, treat that explosive charge is finished after, open the article of sealing the immersed tube mouth, expand the end with mechanical bottom-expanding equipment again and form upper base space, and get clean hack, keep the noresidue hack; H, put into the top that reinforcing bar 7 extends into down the precast hollow pile body, with pile body 5 on flow concrete cast upper bed-plate and the cast-in-situ steel concrete from the immersed tube mouth; I, extract immersed tube, and between the slit, inject cement paste.
It is a kind of in precast hollow pile body and the solid precast pile or both combinations that following described in embodiment one and the embodiment two gone up precast pile.
Claims (7)
1, the mixed pile-forming method of precast pile is characterized in that it comprises following processing step: a, the immersed tube that has metal pile head is sunk to the hardpan design elevation; B, taking-up metal pile head; C, put into oil emulsion or tnt explosive from the immersed tube mouth, every 0.5m
3Consumption is 1-5 kilograms, seals the immersed tube mouth behind the ignition charge, treat that explosive charge is finished after, open the article of sealing the immersed tube mouth and get clean hack, expand the end with mechanical bottom-expanding equipment and form lower base space, and get clean hack, keep the noresidue hack; D, cast lower bottom base; E, put into down precast pile, joint bar and lower bottom base is anchored; F, on pull out immersed tube to the distance H of setting; G, put into oil emulsion or tnt explosive from the immersed tube mouth, every 0.5m
3Consumption is 1-5 kilograms, seals the immersed tube mouth behind the ignition charge, treat that explosive charge is finished after, open the article of sealing the immersed tube mouth, expand the end with mechanical bottom-expanding equipment again and form upper base space, and get clean hack, keep the noresidue hack; H, put into the top that reinforcing bar extends into down the precast hollow pile body, with pile body on flow concrete cast upper bed-plate and the cast-in-situ steel concrete from the immersed tube mouth; I, extract immersed tube, and between the slit, inject cement paste.
2, the mixed pile-forming method of precast pile according to claim 1, it is characterized in that the mechanical bottom-expanding equipment expansion of the usefulness end formation lower base space concrete steps among described operation c and the g are as follows: take out metal pile head, the mark that the detent rail pin of bottom-expanding equipment is aimed on the immersed tube mouth is lowered to immersed tube, start equipment after the equipment upper end is also fixedly positioning and expand the end, expand the end and be vertical earlier expand the end again level expand the end, when reaching, construction stops automatically after design is marked deeply, base cavity pocket is formed on the bottom, expanding the work of undercutting sharpener this moment reaches when designing base diameter, be that power rail reaches predetermined number of revolutions, expand end shoveling and finish, bottom-expanding equipment is hung out ground.
3, the mixed pile-forming method of precast pile according to claim 1, it is characterized in that getting among described operation c and the g clean hack is to get the hack that is dug down only with inhaling indigenous equipment or mixing method.
4, the mixed pile-forming method of precast pile according to claim 3, it is as follows to it is characterized in that described mixing method is got the concrete steps of the hack that is dug down only: inhale indigenous equipment with air and fetch earth, when only surplus a small amount of loosing during soil in the base, from immersed tube mouth pouring, pouring limit, limit sops up, and is clean up to fetching earth.
5, the mixed pile-forming method of precast pile according to claim 1, it is characterized in that distance H among the described operation f be base diameter 2-10 doubly.
6, the mixed pile-forming method of precast pile according to claim 1 is characterized in that it is a kind of in precast hollow pile body and the solid precast pile or both combinations that following in the described e operation gone up precast pile.
7, the mixed pile-forming method of precast pile according to claim 1 is characterized in that it is a kind of in precast hollow pile body and the solid precast pile or both combinations that following in the described h operation gone up precast pile.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101572474A CN101397787A (en) | 2007-09-29 | 2007-09-29 | Mixed pile-forming method of prefabricated pile body |
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2007101572474A CN101397787A (en) | 2007-09-29 | 2007-09-29 | Mixed pile-forming method of prefabricated pile body |
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| CN101397787A true CN101397787A (en) | 2009-04-01 |
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| CNA2007101572474A Pending CN101397787A (en) | 2007-09-29 | 2007-09-29 | Mixed pile-forming method of prefabricated pile body |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105887873A (en) * | 2015-01-26 | 2016-08-24 | 王庆伟 | Prefabricated pile carrier type cast-in-place pile and pile forming method thereof |
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2007
- 2007-09-29 CN CNA2007101572474A patent/CN101397787A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105887873A (en) * | 2015-01-26 | 2016-08-24 | 王庆伟 | Prefabricated pile carrier type cast-in-place pile and pile forming method thereof |
| CN105887873B (en) * | 2015-01-26 | 2018-02-23 | 王庆伟 | The pile making method of prefabricated pile carrier type bored concrete pile |
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Open date: 20090401 |