CN101130966A - Pile-forming method for two-level expanding bottom prefabricated pile body - Google Patents
Pile-forming method for two-level expanding bottom prefabricated pile body Download PDFInfo
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- CN101130966A CN101130966A CNA2007101572718A CN200710157271A CN101130966A CN 101130966 A CN101130966 A CN 101130966A CN A2007101572718 A CNA2007101572718 A CN A2007101572718A CN 200710157271 A CN200710157271 A CN 200710157271A CN 101130966 A CN101130966 A CN 101130966A
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Abstract
The present invention relates to construction of building pile foundation engineering, and is especially piling process of two-stage under-reamed prefabricated pile stem. The piling process includes the following steps: 1. immersing immersed tube with metal pile head into hardpan to design elevation; 2. taking out the metal pile head; 3. forming the lower base space with under reaming apparatus, and pouring concrete to form the lower base; 4. immersing the prefabricated solid pile stem with steel dowels in the lower end into the immersed tube; 5. drawing upwards the immersed tube to designed distance, forming the upper base space with under reaming apparatus, passing the steel dowels through the upper base space and connecting to the lower prefabricated pile stem, setting the upper fabricated pile stem into the immersed tube and pouring concrete to form the upper base; and 6. withdrawing the immersed tube and injecting cement mortar to the gap.
Description
Technical field
The present invention relates to a kind of construction of building pile foundation engineering, the piling method of the bottom-enlarging prefabricated pile body of particularly a kind of two-stage.
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 problem that the present invention is directed to the prior art existence provides the piling method of the bottom-enlarging prefabricated pile body of a kind of two-stage, purpose is to improve the utilization rate and the reduction coefficient of the strength of materials, and pile body and base good concentricity obviously improve single pile bearing capacity, the reliable degree height, and can reduce the pile foundation engineering cost.
The piling method of the bottom-enlarging prefabricated pile body of two-stage 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, with mechanical bottom-expanding equipment processing lower base space, with inhaling indigenous equipment exhaustion hack, perfusion concrete cast lower bottom base; D, the lower end is had the following prefabricated solid pile body of joint bar, put into immersed tube until putting in place; E, on pull out immersed tube to setpoint distance H, with mechanical bottom-expanding equipment processing upper base space, joint bar is passed upper base space links to each other with following precast pile, last precast hollow pile body is put into the mesopore injection concrete of immersed tube from last precast pile, pour into a mould upper bed-plate; F, extract immersed tube, between the slit, inject cement paste.
The mechanical bottom-expanding equipment expansion of usefulness among described operation c and e end processing base space concrete steps are as follows: 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.
Setpoint distance H among the described operation e is 2-10 a times of base diameter.
The present invention is compared with prior art owing to do protection and rely on immersed tube, prefabricated in addition pile body up and down, and a series of technical measures such as upper bed-plate under the cast-in-place notes steel concrete, and have following advantage and good effect through evidence:
1, the ratio of base diameter and pile body diameter can reach 3.5-5, surpasses state-set standard;
2, the obvious raising of reduction coefficient can reach 0.9-1.0, improves strength of materials utilization rate;
3, do protection and rely on accurate positioning with immersed tube, make the Up/down base and the good concentricity of pile body up and down;
4, improve single pile bearing capacity, reliable degree height;
5, reduce the construction cost of building pile foundation engineering;
6, overcome the existing in prior technology defective.
Description of drawings
Fig. 1 a-Fig. 1 c is each operation status of processes schematic diagram of the present invention.
Among the figure 1, lower base space; 2, immersed tube; 3, following prefabricated solid pile body; 4, upper base space; 5, joint bar; 6, go up the precast hollow pile body.
The specific embodiment
Embodiments of the invention 1a-1c in conjunction with the accompanying drawings are described in detail.
The piling method of the bottom-enlarging prefabricated pile body of two-stage of the present invention comprises following processing step:
A, the immersed tube 2 that has metal pile head is sunk to the hardpan design elevation; B, taking-up metal pile head; C, expand the end with mechanical bottom-expanding equipment and process lower base space 1, with inhaling indigenous equipment exhaustion hack, perfusion concrete cast lower bottom base; D, the lower end is had the following prefabricated solid pile body 3 of joint bar, put into immersed tube until putting in place; E, on pull out immersed tube 2 to setpoint distance H, expand the end with mechanical bottom-expanding equipment and process upper base space 4, joint bar 5 is passed upper base space 4 to link to each other with following prefabricated solid pile body 3 epimeres, then will go up precast hollow pile body 6 and put into the mesopore injection concrete cast upper bed-plate of immersed tube 2, as shown in Figure 1a from last precast pile; F, extract immersed tube, between the slit, inject cement paste.
The concrete steps of exhaustion hack are as follows among the above-mentioned operation c: 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.
The mechanical bottom-expanding equipment of above-mentioned operation c and the usefulness among the e expands the end, and to process upper and lower base space concrete steps as follows: 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.
Claims (4)
1. the piling method of the bottom-enlarging prefabricated pile body of two-stage 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, with mechanical bottom-expanding equipment processing lower base space, with inhaling indigenous equipment exhaustion hack, perfusion concrete cast lower bottom base; D, the lower end is had the following prefabricated solid pile body of joint bar, put into immersed tube until putting in place; E, on pull out immersed tube to setpoint distance H, with mechanical bottom-expanding equipment processing upper base space, joint bar is passed upper base space links to each other with following precast pile, last precast hollow pile body is put into the mesopore injection concrete of immersed tube from last precast pile, pour into a mould upper bed-plate; F, extract immersed tube, between the slit, inject cement paste.
2. the piling method of the bottom-enlarging prefabricated pile body of two-stage according to claim 1, it is characterized in that the mechanical bottom-expanding equipment expansion of the usefulness end processing base space concrete steps among described operation c and the e are as follows: 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 piling method of the bottom-enlarging prefabricated pile body of two-stage according to claim 1, it is characterized in that setpoint distance H among the described operation e be base diameter 2-10 doubly.
4. the piling method of the bottom-enlarging prefabricated pile body of two-stage according to claim 1, the concrete steps that it is characterized in that among the described operation c exhaustion hack 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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101572718A CN101130966A (en) | 2007-09-29 | 2007-09-29 | Pile-forming method for two-level expanding bottom prefabricated pile body |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101572718A CN101130966A (en) | 2007-09-29 | 2007-09-29 | Pile-forming method for two-level expanding bottom prefabricated pile body |
Publications (1)
| Publication Number | Publication Date |
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| CN101130966A true CN101130966A (en) | 2008-02-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2007101572718A Pending CN101130966A (en) | 2007-09-29 | 2007-09-29 | Pile-forming method for two-level expanding bottom prefabricated pile body |
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|---|---|
| CN (1) | CN101130966A (en) |
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2007
- 2007-09-29 CN CNA2007101572718A patent/CN101130966A/en active Pending
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