CN100580186C - Pile forming method for high-bearing two-stage bottom expanding prefabricated pile body - Google Patents
Pile forming method for high-bearing two-stage bottom expanding prefabricated pile body Download PDFInfo
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- CN100580186C CN100580186C CN200710157272A CN200710157272A CN100580186C CN 100580186 C CN100580186 C CN 100580186C CN 200710157272 A CN200710157272 A CN 200710157272A CN 200710157272 A CN200710157272 A CN 200710157272A CN 100580186 C CN100580186 C CN 100580186C
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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 mechanically, drawing upwards the immersed tube to designed distance, forming the upper base space and taking out soil; 4. connecting the prefabricated hollow lower pile stem with steel dowels to the prefabricated upper hollow pile through reinforcing bars and immersing into the immersed tube; 5. pouring concrete to form the lower base and the upper base; and 6. withdrawing the immersed tube and injecting cement mortar to the gap. The present invention has the advantages of high material strength utilizing rate and deduction coefficient up to 0.9-1.0.
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 secondary.
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 a kind of piling method with bottom-enlarging prefabricated pile body of secondary of high-bearing capacity, purpose is to improve the utilization rate and the reduction coefficient of the strength of materials, make bearing capacity of single pile higher, make that base diameter and pile body diameter ratio are big to reach the expected design effect fully.
Piling method with bottom-enlarging prefabricated pile body of secondary of high-bearing capacity 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, expand the end with mechanical bottom-expanding equipment and form lower base space, on pull out immersed tube to setpoint distance H, expand the end with mechanical bottom-expanding equipment and form upper base space, inhale the indigenous equipment hack that exhausts; D, the following precast hollow pile body that the lower end is had a joint bar put down until putting in place with the mouth of pipe of drowning oneself after last precast hollow pile body links to each other by reinforcing bar; E, pour into concrete, water and pour down upper bed-plate from the mesopore of pile body; F, extract immersed tube, between the slit, inject cement paste.
Have the piling method of the bottom-enlarging prefabricated pile body of secondary of high-bearing capacity, comprise 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, expand the end with mechanical bottom-expanding equipment and form lower base space, on pull out immersed tube to setpoint distance H, expand the end with mechanical bottom-expanding equipment and form upper base space, inhale the indigenous equipment hack that exhausts; D, pour into concrete cast lower bottom base from the immersed tube mouth; E, the following prefabricated solid pile body 8 that the lower end is had a joint bar 7 insert in the immersed tube 2 until putting the cast upper bed-plate in place by reinforcing bar 6 back that links to each other with last precast hollow stake 4; F, extract immersed tube 2, between the slit, inject cement paste.
It is as follows that the mechanical bottom-expanding equipment expansion of usefulness among the described operation c end forms the lower base space concrete steps: 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.
The concrete steps of exhaustion hack are as follows among the described 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.
Setpoint distance H among the described operation c is 2-10 a times of base diameter.
The present invention is compared with prior art owing to do protection and support with immersed tube; and adopt technical measures such as precast hollow combined pile body; and through its strength of materials utilization rate height of evidence; reduction coefficient can reach 0.9-1.0; the ratio of base diameter and pile body diameter surpasses state-set standard, and the single pile bearing capacity height obviously reduces the pile foundation engineering cost; reaching the Expected Results of design fully, is the preferred job practices of multistage base large bearing capacity pile.
Description of drawings
Fig. 1 a-1e is each operation status of processes schematic diagram of the present invention.
Fig. 2 is the master operation construction view of another embodiment of the present invention.
Among the figure 1, lower base space; 2, immersed tube; 3, upper base space; 4, go up the precast hollow pile body; 5, following precast hollow pile body; 6, reinforcing bar; 7, joint bar; 8, prefabricated solid pile body.
The specific embodiment
Embodiments of the invention are described in detail in conjunction with the accompanying drawings.
Embodiment 1:
As Fig. 1 a-Fig. 1 e piling method with bottom-enlarging prefabricated pile body of secondary of high-bearing capacity of the present invention, comprise following processing step:
A, the immersed tube 2 that has metal pile head 1 is sunk to the hardpan design elevation; B, taking-up metal pile head; C, expand the end with mechanical bottom-expanding equipment and form lower base space 1, on pull out immersed tube 2 to setpoint distance H, expand the end with mechanical bottom-expanding equipment and form upper base space 3, with inhaling the indigenous equipment hack that exhausts; D, the following precast hollow pile body 5 that the lower end is had a joint bar 7 put down until putting in place from 2 mouthfuls of immersed tube by reinforcing bar 6 back that links to each other with last precast hollow pile body 4; E, pour into concrete, water and pour down upper bed-plate from the mesopore of pile body; F, extract immersed tube 2, between the slit, inject cement paste.
Embodiment 2:
Operation a to c is identical with embodiment 1.As shown in Figure 2, operation d pours into concrete cast lower bottom base from the immersed tube mouth; The following prefabricated solid pile body 8 that operation e has the lower end joint bar 7 inserts in the immersed tube 2 until putting the cast upper bed-plate in place by reinforcing bar 6 back that links to each other with last precast hollow stake 4; Operation f extracts immersed tube 2, injects cement paste between the slit.
Setpoint distance H described in embodiment 1 and the embodiment 2 is 2-10 a times of base diameter.
It is as follows that the mechanical bottom-expanding equipment expansion of usefulness among the operation c described in embodiment 1 and the embodiment 2 end forms the lower base space concrete steps: 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.
The concrete steps of exhaustion hack are as follows among the operation c described in embodiment 1 and the embodiment 2: 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 pile foundation engineering of the inventive method manufacturing is eliminated the existing in prior technology defective fully, owing to adopted precast pile, these pile body diameters are little, and it is very big that bearing capacity can be done, and quality can check and guarantee, be particularly suitable for multistage expansion at the bottom of large bearing capacity pile use.
Claims (4)
1, the piling method that has the bottom-enlarging prefabricated pile body of secondary of high-bearing capacity 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, expand the end with mechanical bottom-expanding equipment and form lower base space, on pull out immersed tube to setpoint distance H, expand the end with mechanical bottom-expanding equipment and form upper base space, inhale the indigenous equipment hack that exhausts; D, the following precast hollow pile body that the lower end is had a joint bar put down until putting in place with the mouth of pipe of drowning oneself after last precast hollow pile body links to each other by reinforcing bar; E, pour into concrete, water and pour down upper bed-plate from the mesopore of pile body; F, extract immersed tube, between the slit, inject cement paste.
2, piling method with bottom-enlarging prefabricated pile body of secondary of high-bearing capacity 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 the described operation c 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 with bottom-enlarging prefabricated pile body of secondary of high-bearing capacity according to claim 1, the concrete steps that it is characterized in that exhaustion hack among the described operation c 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.
4, the piling method with bottom-enlarging prefabricated pile body of secondary of high-bearing capacity according to claim 1, it is characterized in that setpoint distance H among the described operation c be base diameter 2-10 doubly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710157272A CN100580186C (en) | 2007-09-29 | 2007-09-29 | Pile forming method for high-bearing two-stage bottom expanding prefabricated pile body |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710157272A CN100580186C (en) | 2007-09-29 | 2007-09-29 | Pile forming method for high-bearing two-stage bottom expanding prefabricated pile body |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101135163A CN101135163A (en) | 2008-03-05 |
| CN100580186C true CN100580186C (en) | 2010-01-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200710157272A Expired - Fee Related CN100580186C (en) | 2007-09-29 | 2007-09-29 | Pile forming method for high-bearing two-stage bottom expanding prefabricated pile body |
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| Country | Link |
|---|---|
| CN (1) | CN100580186C (en) |
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- 2007-09-29 CN CN200710157272A patent/CN100580186C/en not_active Expired - Fee Related
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| Publication number | Publication date |
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| CN101135163A (en) | 2008-03-05 |
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Granted publication date: 20100113 Termination date: 20130929 |