CN102877466A - Rotary expansion cast-in-place pile and construction method thereof - Google Patents
Rotary expansion cast-in-place pile and construction method thereof Download PDFInfo
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- CN102877466A CN102877466A CN 201210334623 CN201210334623A CN102877466A CN 102877466 A CN102877466 A CN 102877466A CN 201210334623 CN201210334623 CN 201210334623 CN 201210334623 A CN201210334623 A CN 201210334623A CN 102877466 A CN102877466 A CN 102877466A
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Abstract
The invention relates to a rotary expansion cast-in-place pile and a construction method thereof. According to the construction method, a plurality of concrete bearing discs with expanded cross sections are arranged on the conventional drilling cast-in-place pile body within a longitudinal cross section range to fully exert pile tip resistance of all soil layers, so that the bearing capacity of the cast-in-place pile is substantially improved. The method comprises the following steps of: 1, drilling to form a hole in the cast-in-place pile; 2, lifting a drilling tool, arranging a high-voltage rotary jet grouting machine in place, starting rotary jet grouting equipment, inputting airflow, water flow and slurry flow, designing an elevation position in a designed soil layer, and performing rotary jet grouting and expanding to form a plurality of cylinders which have the diameter of 800 to 1,400mm and the height of 400 to 1,000mm; 3, lifting the rotary jet grouting machine, and inserting a steel bar cage; and 4, inserting a central guide pipe, cleaning the hole for a second time to make the cleanliness of the hole meet requirements, and then performing concrete cast-in-place. By the method, the bearing capacity of the cast-in-place pile can be substantially improved, and all supporting layers within the longitudinal cross section range of the drilling cast-in-place pile body can be fully utilized, so that the length of the cast-in-place pile is reduced, construction cost is greatly reduced, and engineering quality is improved; and the rotary expansion cast-in-place pile is suitable to be popularized and applied comprehensively.
Description
Technical field
The present invention relates to a kind of pile foundation stake, refer more particularly to a kind of grouting pile and job practices thereof of revolving.
Background technology
Existing bored pile pile foundation, mostly be friction pile, when Single Pile Load requires when large, stake is long, the stake footpath is larger, therefore cost is higher, and slenderness ratio of pile is larger, the quality control on construction difficulty is large, the invention provides a kind of cylinder concrete bearing block that in traditional bored pile pile body longitudinal section scope, increases several enlarged cross section, to give full play to each soil layer end resistance, change bored pile into end by friction pile and hold friction pile, Novel cast-in-place pile and job practices thereof that the bearing capacity of castinplace pile is significantly improved, the present invention is rational in infrastructure, give full play to end resistance, easy construction, cost economic, quality control is easy, good working effect.
Summary of the invention
A kind of grouting pile that revolves is comprised of perfusion pile body 1 and a plurality of hole enlargement force bearing disk 2, job practices is: behind the castinplace pile drilling and forming hole, adopt high-pressure rotary spraying method to carry out the hole enlargement construction, form the hole enlargement force bearing disk of several diameters 800-1400mm height 400-1000mm, lay reinforcing cage again, concrete pouring forms.
Description of drawings
Fig. 1 is the structural representation of the embodiment of the invention
Structural representation below in conjunction with the embodiment of the invention further specifies:
Described a kind of grouting pile that revolves is comprised of perfusion pile body 1 and a plurality of hole enlargement force bearing disk 2, job practices is: behind the castinplace pile drilling and forming hole, adopt high-pressure rotary spraying method to carry out the hole enlargement construction, form the hole enlargement force bearing disk of several diameters 800-1400mm height 400-1000mm, lay reinforcing cage again, concrete pouring forms.
The specific embodiment:
Construction sequence is as follows: 1, castinplace pile drilling and forming hole; 2, promote drilling tool, the high-pressure rotary-spray facility are in place, open churning equipment, input air-flow, current, slurry flows, and in design soil layer design elevation position, it is 800～1400mm that the churning hole enlargement forms a plurality of diameters, the cylinder of height 400-1000mm.3, promote the churning facility, be lowered to reinforcing cage.4, be lowered to centre pipe, carry out concrete pouring after secondary pile hole cleaning meets the demands.
Concrete construction method is:
, stake position anchor point by the standard pore-forming to design elevation;
⑵, carry brill, change the churning drill bit, begin from bottom, stake hole to revolve the cavity of expanding into design height and diameter and the retaining wall slurry of spraying simultaneously by design elevation position high pressure;
⑶ expanding drilling tool is revolved in, promotion;
⑷, descending reinforcing cage;
⑸, lower center perfusion cannula;
⑹, secondary pile hole cleaning;
⑺ perfusion concrete is to design elevation;
8, telephone-moving is to next position.
Embodiment:
The Nantong community residential building, 30 layers of floor heights, building height 87.0m, if one deck basement, former design pile foundation adopts PHC-600(130) AB-C80 type high-strength Prestressed Pipe Pile, effective length 49m, pile-base supporting layer are 11th layer flour sand and silt alternating layers, and the vertical ultimate bearing capacity of single pile eigenvalue requirements reaches 4500KN.
Now adopt variable cross-section of the present invention to revolve the grouting pile scheme, design stake footpath Φ 600mm, if 3 variable cross-section cylinder force bearing disks, lay respectively at the 4th layer, 7-1 layer, the 9th layer, force bearing disk diameter of phi 1400mm, height 1000mm, concrete label C30, effective length 26m, the vertical ultimate bearing capacity of single pile characteristic value reaches 4700KN after testing.Through adjusting the pile for prestressed pipe scheme that adopts, 14700 yuan/root of single stake cost, variable cross-section revolve 11500 yuan/root of grouting pile single stake cost, but relative saving construction cost 21.76%.
The method can significantly improve the castinplace pile supporting capacity, and to shorten grout pile long thereby can take full advantage of bored pile pile body longitudinal section each bearing stratum of scope, greatly reduces construction cost, improved workmanship, is fit to popularize in an all-round way use.
Claims (2)
1. one kind revolves grouting pile and job practices thereof, it is characterized in that: the described grouting pile that revolves is comprised of perfusion pile body 1 and a plurality of hole enlargement force bearing disk 2, job practices is: behind the castinplace pile drilling and forming hole, adopt high-pressure rotary spraying method to carry out the hole enlargement construction, form the hole enlargement force bearing disk of several diameters 800-1400mm height 400-1000mm, lay reinforcing cage again, concrete pouring forms.
2. according to claim 1 described a kind of section bored pile and job practices thereof, it is characterized in that: construction sequence is as follows: A, castinplace pile drilling and forming hole; B, lifting drilling tool, the high-pressure rotary-spray facility are in place, open churning equipment, input air-flow, current, slurry flows are in design soil layer design elevation position, it is 800～1400mm that the churning hole enlargement forms a plurality of diameters, the cylinder of height 400-1000mm, C, lifting churning facility are lowered to reinforcing cage, D, be lowered to centre pipe, carry out concrete pouring after secondary pile hole cleaning meets the demands.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201210334623 CN102877466A (en) | 2012-09-12 | 2012-09-12 | Rotary expansion cast-in-place pile and construction method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201210334623 CN102877466A (en) | 2012-09-12 | 2012-09-12 | Rotary expansion cast-in-place pile and construction method thereof |
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| Publication Number | Publication Date |
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| CN102877466A true CN102877466A (en) | 2013-01-16 |
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| CN 201210334623 Pending CN102877466A (en) | 2012-09-12 | 2012-09-12 | Rotary expansion cast-in-place pile and construction method thereof |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103334428A (en) * | 2013-06-24 | 2013-10-02 | 河海大学 | Disc type cast-in-place concrete pile and construction process for same |
| CN104988907A (en) * | 2015-08-02 | 2015-10-21 | 王继忠 | Construction method of concrete pile |
| CN108330959A (en) * | 2018-01-30 | 2018-07-27 | 山东倍特力地基工程技术有限公司 | The spiral spray that spray expansion extruding built pile and its construction method and this method use, which is expanded, squeezes drilling machine |
| CN108978698A (en) * | 2018-07-18 | 2018-12-11 | 中建七局第建筑有限公司 | A kind of building pile foundation construction method |
| CN110043187A (en) * | 2019-05-16 | 2019-07-23 | 北京中岩大地科技股份有限公司 | The fluid pressure type reducing reaming bit and filling pile construction engineering method of long-spiral drilling machine |
-
2012
- 2012-09-12 CN CN 201210334623 patent/CN102877466A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103334428A (en) * | 2013-06-24 | 2013-10-02 | 河海大学 | Disc type cast-in-place concrete pile and construction process for same |
| CN103334428B (en) * | 2013-06-24 | 2015-05-06 | 河海大学 | Disc type cast-in-place concrete pile and construction process for same |
| CN104988907A (en) * | 2015-08-02 | 2015-10-21 | 王继忠 | Construction method of concrete pile |
| CN108330959A (en) * | 2018-01-30 | 2018-07-27 | 山东倍特力地基工程技术有限公司 | The spiral spray that spray expansion extruding built pile and its construction method and this method use, which is expanded, squeezes drilling machine |
| WO2019148812A1 (en) * | 2018-01-30 | 2019-08-08 | 山东倍特力地基工程技术有限公司 | Jetting, expansion and extrusion combined pile, construction method thereof and spiral jetting, expansion and extrusion drilling rig used in method |
| CN108330959B (en) * | 2018-01-30 | 2019-10-11 | 山东倍特力地基工程技术有限公司 | The spiral spray that spray expansion extruding built pile and its construction method and this method use, which is expanded, squeezes drilling machine |
| US11299864B2 (en) | 2018-01-30 | 2022-04-12 | Shandong Bei Te Li Foundation Engineering Technology Co., Ltd | Jetting, expansion and extrusion combined pile, construction method thereof and spiral jetting, expansion and extrusion drilling rig used in method |
| CN108978698A (en) * | 2018-07-18 | 2018-12-11 | 中建七局第建筑有限公司 | A kind of building pile foundation construction method |
| CN110043187A (en) * | 2019-05-16 | 2019-07-23 | 北京中岩大地科技股份有限公司 | The fluid pressure type reducing reaming bit and filling pile construction engineering method of long-spiral drilling machine |
| CN110043187B (en) * | 2019-05-16 | 2024-01-30 | 北京中岩大地科技股份有限公司 | Hydraulic diameter-variable reaming bit of long spiral drilling machine and construction method of cast-in-place pile |
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| PB01 | Publication | ||
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| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20130116 |