CN101135161A - Mixed pile forming method for one-stage bottom expanding steel pipe composite pile body - Google Patents
Mixed pile forming method for one-stage bottom expanding steel pipe composite pile body Download PDFInfo
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- CN101135161A CN101135161A CNA2007101572652A CN200710157265A CN101135161A CN 101135161 A CN101135161 A CN 101135161A CN A2007101572652 A CNA2007101572652 A CN A2007101572652A CN 200710157265 A CN200710157265 A CN 200710157265A CN 101135161 A CN101135161 A CN 101135161A
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Abstract
The present invention relates to construction of building pile foundation engineering, and is especially mixed piling process of one-stage under-reamed composite steel pipe pile. The mixed piling process includes the following steps: 1. erecting prefabricated reinforced concrete immersed pile head on ground; 2. pressing immersed tube onto the reinforced concrete pile head; 3. immersing the immersed tube into hardpan to design elevation; 4. drawing upwards the immersed tube to designed distance; 5. forming lower base space and taking out soil; 6. setting steel dowels; and 6. pouring concrete into the immersed tube until reaching the ground level to form the composite steel pipe pile stem. The pile has the ratio between the base diameter and the pile stem diameter as great as 5-6, deduction coefficient up to 0.9-1.0, high material strength utilizing rate, great bearing capacity and other advantages.
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 one-stage bottom expanding steel pipe composite pile body.
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, a kind of mixed pile-forming method of one-stage bottom expanding steel pipe composite pile body, purpose are provided is to make base diameter and pile body diameter ratio is bigger, security reliability is high, and single pile bearing capacity is big, the piling method advantages of simple.
The mixed pile-forming method of one-stage bottom expanding steel pipe composite pile body comprises following processing step: a, vertically stands on the precast reinforced concrete pile crown on the ground standby; B, immersed tube are contained on the precast reinforced concrete pile crown; C, immersed tube sink to hardpan to design elevation; D, on pull out immersed tube to setpoint distance H; E, taking-up metal pile head; C, put into oil emulsion or tnt explosive from the immersed tube mouth, every 0.5m
3Consumption is the 1-5 kilogram, 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, be processed to form base space with mechanical bottom-expanding equipment again, get clean hack; F, put down joint bar; G, form steel pipe composite pile body from immersed tube mouth perfusion concrete to ground level.
Expanding base space down with mechanical bottom-expanding equipment processing among the described operation e can be replaced by positive crossover-circulating type method.
Setpoint distance H among the described operation d is 0.6-1.0 a times of base diameter.
The mechanical bottom-expanding equipment expansion of usefulness among described operation 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.
The concrete steps of getting clean hack among the above-mentioned operation e 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.
The present invention compared with prior art, owing to do protection and support with immersed tube, and steel concrete pile crown and trustship are not taken out, be that immersed tube is again the steel pipe of steel pipe composite pile body and base and pile body poured into technical measures such as fuse together, and have base diameter and the bigger 5-6 of reaching of pile body diameter ratio through evidence, the supporting capacity of single pile obviously improves, the reliable degree height, and reduction coefficient can reach the advantages such as utilization rate that 0.9-1.0 makes full use of the strength of materials; The one-level expanded bore pile that while the inventive method is made reaches the Expected Results of design.
Description of drawings
Fig. 1 a-1e is the view of master operation construction of the present invention.
Among the figure 1, the precast reinforced concrete pile crown; 2, immersed tube; H is the 0.6-1.0 of base diameter; 3, base space; 4, joint bar.
The specific embodiment
Embodiments of the invention are described in detail in conjunction with the accompanying drawings.
As shown in the figure, the mixed pile-forming method of one-stage bottom expanding steel pipe composite pile body of the present invention comprises following processing step: a, vertically stands on precast reinforced concrete pile crown 1 on the ground standby; B, immersed tube 2 are contained on the precast reinforced concrete pile crown 1; C, immersed tube 2 sink to hardpan to design elevation; D, on pull out immersed tube 2 to setpoint distance H, the 0.6-1.0 that its H value is a base diameter is doubly; E, taking-up metal pile head; C, put into oil emulsion or tnt explosive from the immersed tube mouth, every 0.5m
3Consumption is the 1-5 kilogram, 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, be processed to form base space with mechanical bottom-expanding equipment again, get clean hack; F, put down joint bar 4 into; G, form steel pipe composite pile body from 2 mouthfuls of immersed tube perfusion concrete to ground level.
The mechanical bottom-expanding equipment expansion of usefulness among described operation 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.
The concrete steps of getting clean hack among the above-mentioned operation e 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.
The inventive method, owing to will descend joint bar 4 to extend upwardly to more than the hardpan from base, and do not extract immersed tube 2 with base, pile body casting complete together, good integrity, form steel pipe composite pile body, so bearing capacity is done more, the reliable degree height constitutes a kind of new structure form of immersed tube prefabricated one-level expanded bore pile.
Claims (4)
1. the mixed pile-forming method of one-stage bottom expanding steel pipe composite pile body is characterized in that comprising following processing step: a, vertically stands on the precast reinforced concrete pile crown on the ground standby; B, immersed tube are contained on the precast reinforced concrete pile crown; C, immersed tube sink to hardpan to design elevation; D, on pull out immersed tube to setpoint distance H; E, taking-up metal pile head; C, put into oil emulsion or tnt explosive from the immersed tube mouth, every 0.5m
3Consumption is the 1-5 kilogram, 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, be processed to form base space with mechanical bottom-expanding equipment again, get clean hack; F, put down joint bar; G, form steel pipe composite pile body from immersed tube mouth perfusion concrete to ground level.
2. the mixed pile-forming method of one-stage bottom expanding steel pipe composite pile body according to claim 1, it is characterized in that setpoint distance H among the described operation d be base diameter 0.6-1.0 doubly.
3. the mixed pile-forming method of one-stage bottom expanding steel pipe composite pile body 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 the described operation 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.
4. the mixed pile-forming method of one-stage bottom expanding steel pipe composite pile body according to claim 1, the concrete steps that it is characterized in that getting among the described operation e clean 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 |
|---|---|---|---|
| CNA2007101572652A CN101135161A (en) | 2007-09-29 | 2007-09-29 | Mixed pile forming method for one-stage bottom expanding steel pipe composite pile body |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101572652A CN101135161A (en) | 2007-09-29 | 2007-09-29 | Mixed pile forming method for one-stage bottom expanding steel pipe composite pile body |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101135161A true CN101135161A (en) | 2008-03-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2007101572652A Pending CN101135161A (en) | 2007-09-29 | 2007-09-29 | Mixed pile forming method for one-stage bottom expanding steel pipe composite pile body |
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| Country | Link |
|---|---|
| CN (1) | CN101135161A (en) |
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2007
- 2007-09-29 CN CNA2007101572652A patent/CN101135161A/en active Pending
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Open date: 20080305 |