CN103422499A - Inner and outer pile casing construction method for frozen soil area pile foundation - Google Patents
Inner and outer pile casing construction method for frozen soil area pile foundation Download PDFInfo
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- CN103422499A CN103422499A CN2013103665411A CN201310366541A CN103422499A CN 103422499 A CN103422499 A CN 103422499A CN 2013103665411 A CN2013103665411 A CN 2013103665411A CN 201310366541 A CN201310366541 A CN 201310366541A CN 103422499 A CN103422499 A CN 103422499A
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Abstract
The invention relates to the technical field of the frozen soil cast-in-place pile foundation of a power transmission line, in particular to an inner and outer pile casing construction method for a frozen soil area pile foundation. The inner and outer pile casing construction method for the frozen soil area pile foundation is characterized in that the rotary drilling rig pore forming technology is adopted in a pile foundation pore forming stage for construction; in the digging and pouring process, the inner pile casing and the outer pile casing are cooperated to construct so as to achieve the effects of quick pile foundation pore forming and stable pit wall in the pouring process on the premise of reducing pit wall collapse; the outer pile casing is rolled by increasing 200mm on the basis of the basic diameter, the height is 3m, a reinforcing plate with the width of 200mm is respectively additionally arranged on each of two ends, and four eyeholes of phi 25mm are evenly dug; and the inner pile casing is processed according to the basic diameter, the height of the inner pile casing is determined according to the upper limit value of the frozen soil, and the inner pile casing is generally manufactured into a standard knot of 3m. According to the inner and outer pile casing construction method for the frozen soil area pile foundation, the problem of the warm season construction of the cast-in-place pile foundation of the multi-year frozen soil area is solved, and the disturbance to multi-year frozen soil is reduced, thereby being favorable for the environment protection. The construction quality and the work efficiency of the pile foundation are improved, and the engineering cost is reduced. The inner and outer pile casing construction method has a simple structure, is convenient and quick to use and is economical and practical, and the days for construction are reduced.
Description
Technical field
The present invention relates to transmission line of electricity frozen soil castinplace pile pile foundation technical field of construction, particularly relate to a kind of inside and outside casing job practices of high mountain permafrost area pile foundation that is applied in.
Background technology
At the Permafrost Area pile foundation construction, because melting, warm season foundation ditch frozen soil easily caves in, pile foundation pore-forming difficulty, difficulty of construction is large.At winter construction, concrete quality is difficult to assurance, and the winter construction expense is high.
Summary of the invention
In order to overcome above-mentioned the deficiencies in the prior art, the invention provides the inside and outside casing job practices of a kind of permafrost region pile foundation, mainly solve in above-mentioned warm season environment, a transmission line of electricity filling pile construction difficult problem, improve pile foundation construction quality and work efficiency, reduces the pile foundation construction cost.
The present invention is by the following technical solutions for achieving the above object:
The inside and outside casing job practices of a kind of permafrost region pile foundation of the present invention, it is characterized in that: in the pile foundation pore-forming stage, adopt the construction of rotary drilling rig hole creating technology, in excavating and cast process use, outer casing coordinative construction, described job practices is to adopt rotary drilling rig to be pressed in hole outer casing when excavation of foundation pit to 3 ± 0.20m left and right, continue excavation of foundation pit, determine whether to need to install again outer casing depending on the foundation pit collapse situation, second outer casing is installed if need, at the top of mounted outer casing eyelet, respectively connect steel cable, and then the outer casing of second section is pushed down to the outer casing of first segment be pressed into foundation ditch simultaneously, and will connect the first segment wire rope one end stand-down of casing outward, excavation of foundation pit is installed interior casing after completing the reinforcing bar hoisting alignment, interior casing is showed high 300～500 mm with being arranged on.And fix by the key dimension centering, then concrete perfusion, poured into the arm that utilizes immediately rotary drilling rig outer casing one has been saved to extraction from top to bottom, interior casing is not extracted out, make basic permanent housings, to reach, to reduce under the prerequisite that the hole wall caves in the pile foundation pore-forming rapid, casts wall stable effect in hole in process.
The inside and outside casing job practices of described a kind of permafrost region pile foundation, it is characterized in that: described outer casing increases by 200 mm according to basic diameter and rolls, and is highly 3 m, and two increases the wide stiffener of 200 mm, evenly accomplishes fluently 4 φ 25mm eyelets; Interior casing is processed according to basic diameter, and height is determined according to the frozen soil upper limit value, generally is made into the standard knot of 3m.
The inside and outside casing job practices of described a kind of permafrost region pile foundation is characterized in that: described outer casing is installed 1～2 joint according to frozen soil upper limit, can the repetitive cycling utilization, and interior casing can only utilize once, does not remove and do the permanent topping in basis.
The inside and outside casing job practices of described a kind of permafrost region pile foundation, it is characterized in that: this job practices is when warm season is constructed, behind excavation of foundation pit to 3 ± 0.20m left and right, outer casing adopts rotary drilling rig to be pressed in hole, preventing from cheating wall caves in, after pile foundation pore-forming reinforcement installation completes, between casing and reinforcing bar, interior casing is installed outside fixing.
The inside and outside casing job practices of described a kind of permafrost region pile foundation is characterized in that: when this job practices is constructed in the winter time, and because the effect hole wall of frozen soil does not cave in, casing in only needing to install.
Described inside and outside casing, the general steel plate of thick 10-15 mm that adopts of outer casing rolls, and interior casing adopts glass fiber reinforced plastic to make, and wall thickness is not less than 10-15 mm.
Beneficial effect of the present invention: solved the difficult problem of Permafrost Area bored concrete pile foundation warm season construction, reduced the disturbance to ever-frozen ground, be beneficial to environmental protection; Improve pile foundation construction quality and work efficiency, saved engineering cost; Due to simple in structure flexible, convenient to use, economical and practical, save the duration.
The accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Fig. 1 is outer casing structure schematic diagram;
Fig. 2 is the plan structure schematic diagram of Fig. 1;
Fig. 3 is interior casing structure schematic diagram;
Fig. 4 is the plan structure schematic diagram of Fig. 3;
Fig. 5 is the field schematic diagram.Wherein: the 1st, outer casing, the 2nd, interior casing, 3 holes.
The specific embodiment
The inside and outside casing job practices of a kind of permafrost region pile foundation of the present invention, it is characterized in that: in the pile foundation pore-forming stage, adopt the construction of rotary drilling rig hole creating technology, in excavating and cast process use, outer casing coordinative construction, described job practices is to adopt rotary drilling rig to be pressed in hole outer casing when excavation of foundation pit to 3 ± 0.20m left and right, continue excavation of foundation pit, determine whether to need to install again outer casing depending on the foundation pit collapse situation, second outer casing is installed if need, at the top of mounted outer casing eyelet, respectively connect steel cable, and then the outer casing of second section is pushed down to the outer casing of first segment be pressed into foundation ditch simultaneously, and will connect the first segment wire rope one end stand-down of casing outward, excavation of foundation pit is installed interior casing after completing the reinforcing bar hoisting alignment, interior casing is showed high 300～500 mm with being arranged on.And fix by the key dimension centering, then concrete perfusion, poured into the arm that utilizes immediately rotary drilling rig outer casing one has been saved to extraction from top to bottom, interior casing is not extracted out, make basic permanent housings, to reach, to reduce under the prerequisite that the hole wall caves in the pile foundation pore-forming rapid, casts wall stable effect in hole in process.
The inside and outside casing job practices of described a kind of permafrost region pile foundation, it is characterized in that: described outer casing increases by 200 mm according to basic diameter and rolls, and is highly 3 m, and two increases the wide stiffener of 200 mm, evenly accomplishes fluently 4 φ 25mm eyelets; Interior casing is processed according to basic diameter, and height is determined according to the frozen soil upper limit value, generally is made into the standard knot of 3m.
The inside and outside casing job practices of described a kind of permafrost region pile foundation is characterized in that: described outer casing is installed 1～2 joint according to frozen soil upper limit, can the repetitive cycling utilization, and interior casing can only utilize once, does not remove and do the permanent topping in basis.
The inside and outside casing job practices of described a kind of permafrost region pile foundation, it is characterized in that: this job practices is when warm season is constructed, behind excavation of foundation pit to 3 ± 0.20m left and right, outer casing adopts rotary drilling rig to be pressed in hole, preventing from cheating wall caves in, after pile foundation pore-forming reinforcement installation completes, between casing and reinforcing bar, interior casing is installed outside fixing.
The inside and outside casing job practices of described a kind of permafrost region pile foundation is characterized in that: when this job practices is constructed in the winter time, and because the effect hole wall of frozen soil does not cave in, casing in only needing to install.
Described inside and outside casing, the general steel plate of thick 10-15 mm that adopts of outer casing rolls, and interior casing adopts glass fiber reinforced plastic to make, and wall thickness is not less than 10-15 mm.
1. major technique of the present invention is to utilize inside and outside two kinds of casings, overcomes the Permafrost Area pile foundation when warm season is constructed, stake hole easy slump, the difficult problem such as pore-forming is difficult, expense is high.
2. mainly bear the hole characteristics of the pressure of frozen soil slump on every side according to outer casing, outer casing increases by 200 mm sizes according to basic diameter, adopts 10-15 mm steel plate to roll.Gap adopts and welds and polish smooth.According to frozen soil upper limit, the outer casing of 1～2 joint is installed, after concrete perfusion, outer steel casing is extracted and is recycled.
3. outer casing adopts machinery to be pressed in hole, for casing two in addition increases the wide stiffening plate of 200 mm, evenly accomplishes fluently 4 φ 25mm eyelets.
4. inner sheath is used mainly as easy collapse hole section template, also is beneficial to extracting of outer casing and recycles, simultaneously as Concrete Anti frost heave safeguard measure.Inner sheath adopts glass fiber reinforced plastic to make for this reason, after the stake hole forming, lifts reinforcing cage, and interior casing is installed between outer casing and reinforcing cage, and interior casing adopts glass fiber reinforced plastic according to the basic engineering dimensioned, does not extract after concrete perfusion and becomes permanent casing.
For outer casing is recycled, reduce construction material consumption, improve project benefit, when outer casing is installed two joints, adopt 4 m steel wire cover one ends to be connected to outer casing one end stand-down at a beneath joint, after completing with convenient construction, the top joint of extraction is extracted a beneath joint again out.
The present invention adopts rotary drilling rig to be pressed in hole outer casing when excavation of foundation pit to 3 ± 0.20m left and right, continue excavation of foundation pit, determine whether to need to install again outer casing depending on the foundation pit collapse situation, second outer casing is installed if need, at the top of mounted outer casing eyelet, respectively connect steel cable, and then the outer casing of second section is pushed down to the outer casing of first segment be pressed into foundation ditch simultaneously, and will connect the first segment wire rope one end stand-down of casing outward, excavation of foundation pit is installed interior casing after completing the reinforcing bar hoisting alignment, interior casing is showed high 300～500 mm with being arranged on.And fix by the key dimension centering, then concrete perfusion, poured into the arm that utilizes immediately rotary drilling rig outer casing one saved to extraction from top to bottom.Interior casing is not extracted out, makes basic permanent housings.
Claims (6)
1. the inside and outside casing job practices of a permafrost region pile foundation, it is characterized in that: in the pile foundation pore-forming stage, adopt the construction of rotary drilling rig hole creating technology, in excavating and cast process use, outer casing coordinative construction, described job practices is to adopt rotary drilling rig to be pressed in hole outer casing when excavation of foundation pit to 3 ± 0.20m, continue excavation of foundation pit, determine whether to need to install again outer casing depending on the foundation pit collapse situation, second outer casing is installed if need, at the top of mounted outer casing eyelet, respectively connect steel cable, and then the outer casing of second section is pushed down to the outer casing of first segment be pressed into foundation ditch simultaneously, and will connect the first segment wire rope one end stand-down of casing outward, excavation of foundation pit is installed interior casing after completing the reinforcing bar hoisting alignment, interior casing is showed high 300～500 mm with being arranged on, and fix by the key dimension centering, then concrete perfusion, poured into the arm that utilizes immediately rotary drilling rig outer casing one has been saved to extraction from top to bottom, interior casing is not extracted out, make basic permanent housings, to reach, to reduce under the prerequisite that the hole wall caves in the pile foundation pore-forming rapid, cast wall stable effect in hole in process.
2. the inside and outside casing job practices of a kind of permafrost region pile foundation according to claim 1, it is characterized in that: described outer casing increases by 200 mm according to basic diameter and rolls, and is highly 3 m, and two increases the wide stiffener of 200 mm, evenly accomplishes fluently 4 φ 25mm eyelets; Interior casing is processed according to basic diameter, and height is determined according to the frozen soil upper limit value, generally is made into the standard knot of 3m.
3. the inside and outside casing job practices of a kind of permafrost region pile foundation according to claim 1, it is characterized in that: described outer casing is installed 1～2 joint according to frozen soil upper limit, can the repetitive cycling utilization, interior casing can only utilize once, does not remove and do the permanent topping in basis.
4. the inside and outside casing job practices of a kind of permafrost region pile foundation according to claim 1, it is characterized in that: this job practices is when warm season is constructed, after excavation of foundation pit to 3 ± 0.20m, outer casing adopts rotary drilling rig to be pressed in hole, preventing from cheating wall caves in, after pile foundation pore-forming reinforcement installation completes, between casing and reinforcing bar, interior casing is installed outside fixing.
5. the inside and outside casing job practices of a kind of permafrost region pile foundation according to claim 1 is characterized in that: when this job practices is constructed in the winter time, and because the effect hole wall of frozen soil does not cave in, casing in only needing to install.
6. according to casing job practices inside and outside claim 1-2 permafrost region pile foundation, it is characterized in that: described inside and outside casing, the general steel plate of thick 10-15 mm that adopts of outer casing rolls, and interior casing adopts glass fiber reinforced plastic to make, and wall thickness is not less than 10-15 mm.
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| CN201310366541.1A CN103422499B (en) | 2013-08-21 | 2013-08-21 | Casing construction method inside and outside a kind of permafrost region pile foundation |
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| CN201310366541.1A CN103422499B (en) | 2013-08-21 | 2013-08-21 | Casing construction method inside and outside a kind of permafrost region pile foundation |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103967032A (en) * | 2014-04-16 | 2014-08-06 | 青岛理工大学 | Double-protective-cylinder cast-in-situ bored pile used for highly-corrosive salty soil and construction method of double-protective-cylinder cast-in-situ bored pile |
| US20160340858A1 (en) * | 2014-03-28 | 2016-11-24 | Public Joint Stock Company "Transneft" | Method for installing overhead transmission line supports on permafrost soils |
| CN106703027A (en) * | 2015-11-12 | 2017-05-24 | 中国电力科学研究院 | Combined pile casing for power transmission tower foundation |
| CN110106910A (en) * | 2019-06-12 | 2019-08-09 | 中国电力工程顾问集团西南电力设计院有限公司 | A kind of major diameter manually digging hole steel-pipe pile for mountain area overhead transmission line |
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| KR100348024B1 (en) * | 1999-07-30 | 2002-08-07 | 홍지기술산업주식회사 | Method for sheet piling after pre-boring |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20160340858A1 (en) * | 2014-03-28 | 2016-11-24 | Public Joint Stock Company "Transneft" | Method for installing overhead transmission line supports on permafrost soils |
| US10100486B2 (en) * | 2014-03-28 | 2018-10-16 | Public Joint Stock Company “Transneft” | Method for installing overhead transmission line supports on permafrost soils |
| CN103967032A (en) * | 2014-04-16 | 2014-08-06 | 青岛理工大学 | Double-protective-cylinder cast-in-situ bored pile used for highly-corrosive salty soil and construction method of double-protective-cylinder cast-in-situ bored pile |
| CN106703027A (en) * | 2015-11-12 | 2017-05-24 | 中国电力科学研究院 | Combined pile casing for power transmission tower foundation |
| CN110106910A (en) * | 2019-06-12 | 2019-08-09 | 中国电力工程顾问集团西南电力设计院有限公司 | A kind of major diameter manually digging hole steel-pipe pile for mountain area overhead transmission line |
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| CN103422499B (en) | 2016-03-02 |
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