CN103046585B - Foundation single pile of wind power horizontal force bearing capacity Static Load Test Method - Google Patents
Foundation single pile of wind power horizontal force bearing capacity Static Load Test Method Download PDFInfo
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Abstract
The present invention relates to foundation single pile of wind power horizontal force bearing capacity Static Load Test Method, be: establish in the inner circle center of circle of the first radius and arrange the horizontal bearing capacity test pile of 1 pile casing type cast-in-place concrete pile as this basis; If the first radius arranges that 1 cast-in-place concrete pile is as horizontal bearing capacity anchoring pile; At anchoring pile and test pile, horizontal steel part base is set, jack is connected horizontally between anchoring pile and the horizontal steel part base of test pile, power is supplied to jack by electric high-voltage pump, by jack load is loaded on anchoring pile and test pile and carries out horizontal bearing capacity static loading test, payload values and test pile shift value is obtained, by computer recording and display test pile load, test pile shift value determination wind electric field fan foundation structure by pressure sensor and displacement transducer; Jack horizontal positioned between anchoring pile and test pile, jack connector has levelness detecting sensor, detects test pile or anchoring pile displacement by levelness detecting sensor.Safety of the present invention is high, and cost is reasonable.
Description
Technical field
The present invention relates to a kind of land Coastal beach drift sand weak soil blower foundation casing technique, particularly the foundation single pile of wind power horizontal force bearing capacity Static Load Test Method of beach drift sand soft foundation blower foundation pile casing type cast-in-place concrete pile horizontal bearing capacity test pile.
Background technology
Dongfang sense city wind energy turbine set is located in the South Sea, belongs to tropical moistening monsoon marine climate, with high temperature and rainy and typhoon for principal character, extreme wind speed 59.0m/s, belongs to II class wind field, and wind field geological conditions belongs to Coastal beach drift sand region, Site Soil is weak soil, complex geologic conditions.Due to coastal by typhoon influence, its blower fan, pylon, blower foundation etc. all need special reinforcement to design, to make blower foundation safe and reliable.
In Coastal beach drift sand soft soil area and in II class wind field and typhoon regional construction wind energy turbine set, all there is not technological borrowing both at home and abroad, particularly large to installed capacity blower fan, complex geologic conditions, Site Soil are drift sand soft foundation, whether can meet bearing capacity and tilt requirements to basic foundation processing scheme, very high requirement is proposed to pile foundation construction process and horizontal bearing capacity test pile.
Summary of the invention
The object of this invention is to provide a kind of horizontal bearing capacity test pile good manufacturability, soft base underlying security is high, and cost is reasonable, is adapted to the foundation single pile of wind power horizontal force bearing capacity Static Load Test Method in Coastal beach drift sand region.
The object of the present invention is achieved like this, and foundation single pile of wind power horizontal force bearing capacity Static Load Test Method, is characterized in that: establish in the inner circle center of circle of the first radius and arrange the horizontal bearing capacity test pile of 1 pile casing type cast-in-place concrete pile as this basis; If the first radius arranges that 1 cast-in-place concrete pile is as horizontal bearing capacity anchoring pile; At anchoring pile and test pile, horizontal steel part base is set, jack is connected horizontally between anchoring pile and the horizontal steel part base of test pile, power is supplied to jack by electric high-voltage pump, by jack load is loaded on anchoring pile and test pile and carries out horizontal bearing capacity static loading test, payload values and test pile shift value is obtained, by computer recording and display test pile load, test pile shift value determination wind electric field fan foundation structure by pressure sensor and displacement transducer; Jack horizontal positioned between anchoring pile and test pile, jack connector there is levelness detecting sensor, test pile or anchoring pile displacement is detected by levelness detecting sensor, when anchoring pile displacement is large, the horizontal angle that levelness detecting sensor detects tilts to anchoring pile, when test pile displacement is large, the horizontal angle that levelness detecting sensor detects tilts to test pile, is obtained the horizontal movement of test pile by Triangle Formula.
Described horizontal bearing capacity of single pile static loading test comprises destructive testing and nondestructive testing.
Described destructive testing: arrange a test pile at base center point, indulge lateral shaft at test pile and arrange 1 anchoring pile, 1 anchoring pile stake footpath Φ 1000mm, the long L=25 ~ 30m of stake, test pile bearing capacity of single pile is about 250kN, and destructive testing test pile maximum load limiting value is 750kN.
Described nondestructive testing: arrange a test pile at base center point, indulge lateral shaft at test pile and arrange four anchoring piles, stake footpath Φ 1000mm, the long L=25 ~ 30m of stake, nondestructive testing test pile bearing capacity of single pile is about 250kN, and test pile maximum load limiting value is 500kN.
Described horizontal bearing capacity test pile top spiral bar spacing 200mm, horizontal bearing capacity test pile length direction stirrup spacing 2000mm, horizontal bearing capacity test pile length direction spiral bar diameter d=10mm, the main muscle diameter d=22mm of horizontal bearing capacity test pile length direction, horizontal bearing capacity test pile length computation for required for bear the direction main muscle of upper load in conjunction with side friction and end resistance, the employing pile casing type of horizontal bearing capacity test pile is in conjunction with the construction technology of retaining wall.
Described establishes horizontal bearing capacity anchoring pile top spiral bar spacing 150mm, described establishes horizontal bearing capacity anchoring pile length direction stirrup spacing 1500mm, described establishes horizontal bearing capacity anchoring pile length direction spiral bar diameter d=12mm, described establishes the main muscle diameter d=25mm of horizontal bearing capacity anchoring pile length direction, and the employing pile casing type of described horizontal bearing capacity anchoring pile is in conjunction with the construction technology of retaining wall.
Described horizontal bearing capacity distance between the anchor pile and the test pile: 3100mm.
Described horizontal bearing capacity space of anchor pile: 0mm
Advantage of the present invention is: establish in the inner circle center of circle of the first radius and arrange the horizontal bearing capacity test pile of 1 pile casing type cast-in-place concrete pile as this basis; If the first radius arranges that 1 cast-in-place concrete pile is as horizontal bearing capacity anchoring pile; Reaction beam is provided by 1 anchoring pile, power is supplied to jack by electric high-voltage pump, load is loaded on test pile that central point arranges by jack and carries out horizontal bearing capacity of single pile static loading test, payload values and test pile shift value is obtained, by computer recording and display test pile load, ftercompction shift value determination wind electric field fan foundation structure by pressure sensor and displacement transducer.The present invention is in conjunction with the horizontal bearing capacity of single pile static loading test test pile scheme of actual seat in the plane preferred arrangement, accelerate programming, the foundation of actual seat in the plane does test pile, reflect the bearing capacity of foundation soil situation based on machine more truly, according to the pile testing method arranged like this, the test pile experiment conclusion drawn, has reacted the reasonability of the safety of Design of Foundation, economy and structure really.
Accompanying drawing explanation
Below in conjunction with the drawings and the specific embodiments, the invention will be further described:
Fig. 1 is embodiment of the present invention foundation level bearing capacity test pile, anchoring pile plan view;
Fig. 2 is embodiment of the present invention foundation level bearing capacity test pile, anchoring pile sectional drawing;
Fig. 3 is the test pile structure chart of Fig. 1;
Fig. 4 is Fig. 1 anchoring pile pile body section;
In figure: 1, wind electric field blower foundation; 2, test pile; 3, anchoring pile; 4, engineering pile.
Detailed description of the invention
As shown in Figure 1, foundation single pile of wind power horizontal force bearing capacity Static Load Test Method: establish in the inner circle center of circle of the first radius and arrange the horizontal bearing capacity test pile 2 of 1 pile casing type cast-in-place concrete pile as this basis; Excellent establish the first radius to arrange 1 cast-in-place concrete pile is as horizontal bearing capacity anchoring pile 3; At anchoring pile 3 and test pile 2, horizontal steel part base is set, jack is connected horizontally between anchoring pile 3 and the horizontal steel part base of test pile 2, power is supplied to jack by electric high-voltage pump, load is loaded on anchoring pile 3 and test pile 2 and carries out horizontal bearing capacity static loading test by jack, payload values and test pile shift value is obtained, by computer recording and display test pile 2 load, test pile shift value determination wind electric field fan foundation structure by pressure sensor and displacement transducer.
Jack horizontal positioned between anchoring pile 3 and test pile 2, jack connector there is levelness detecting sensor, test pile 2 or anchoring pile 3 displacement is detected by levelness detecting sensor, when anchoring pile 3 displacement is large, the horizontal angle that levelness detecting sensor detects tilts to anchoring pile 3, when test pile 2 displacement is large, the horizontal angle that levelness detecting sensor detects tilts to test pile 2, is obtained the horizontal movement of test pile 2 by Triangle Formula.
As shown in Figure 2, comprise: test pile 2, anchoring pile 3 and engineering pile 4, four anchoring piles 3 are distributed in the first radius circumferentially by 90 degree, and engineering pile 4 is distributed in the second radius circumferentially, second radius is greater than the first radius, the circumference of the first radius and the circle center of the second radius concentric with test pile 2.Engineering pile 4 height is lower than test pile 2 and anchoring pile 3, and test pile 2 and anchoring pile 3 height face flush.Engineering pile 4 is covered by wind electric field blower foundation 1, and test pile 2, anchoring pile 3 exceed wind electric field blower foundation 1.
Horizontal bearing capacity of single pile static loading test comprises destructive testing and nondestructive testing.
Destructive testing: arrange a test pile at base center point, indulges lateral shaft at test pile and arranges 1 anchoring pile, 1 anchoring pile stake footpath Φ 1000mm, the long L=25 ~ 30m of stake, and test pile bearing capacity of single pile is about 250kN, and destructive testing test pile maximum load limiting value is 750kN.
Nondestructive testing: arrange a test pile at base center point, indulge lateral shaft at test pile and arrange 1 anchoring pile, stake footpath Φ 1000mm, the long L=25 ~ 30m of stake, nondestructive testing test pile bearing capacity of single pile is about 250kN, and test pile maximum load limiting value is 500kN.
As shown in Figure 3, described horizontal bearing capacity test pile top spiral bar spacing 200mm, horizontal bearing capacity test pile length direction stirrup spacing 2000mm, horizontal bearing capacity test pile length direction spiral bar diameter d=10mm, the main muscle diameter d=22mm of horizontal bearing capacity test pile length direction, horizontal bearing capacity test pile length computation for required for bear the direction main muscle of upper load in conjunction with side friction and end resistance, the employing pile casing type of horizontal bearing capacity test pile is in conjunction with the construction technology of retaining wall.
As shown in Figure 4, described establishes horizontal bearing capacity anchoring pile top spiral bar spacing 150mm, described establishes horizontal bearing capacity anchoring pile length direction stirrup spacing 1500mm, described establishes horizontal bearing capacity anchoring pile length direction spiral bar diameter d=12mm, described establishes the main muscle diameter d=25mm of horizontal bearing capacity anchoring pile length direction, and the employing pile casing type of described horizontal bearing capacity anchoring pile is in conjunction with the construction technology of retaining wall.
Horizontal bearing capacity space of anchor pile: 0mm.
Horizontal bearing capacity distance between the anchor pile and the test pile: 3100mm.
In conjunction with the horizontal bearing capacity of single pile static loading test test pile scheme of actual seat in the plane preferred arrangement, accelerate programming, the foundation of actual seat in the plane does test pile, reflect the bearing capacity of foundation soil situation based on machine more truly, according to the pile testing method arranged like this, the test pile experiment conclusion drawn, has reacted the reasonability of the safety of Design of Foundation, economy and structure really.
The test result of actual seat in the plane:
203# stake: when trial load adds to 675kN, Horizontal Displacement is 19.81 ㎜, H-Y0 curve is slow change type, and Y0-logt curve is parallel or sub-arranged in parallel; : when trial load adds to 750kN, Horizontal Displacement is 35.63mm, and foundation soil strength destroys, therefore termination test.This ultimate lateral bearing capacity of synthetic determination is 675kN;
208# stake: when trial load adds to 500kN, Horizontal Displacement is 17.45 ㎜, H-Y0 curve is slow change type, and Y0-logt curve is parallel or sub-arranged in parallel; Reach design and maximumly add charge values, therefore termination test.This ultimate lateral bearing capacity of synthetic determination > 500kN;
As can be seen here, 203# blower fan single pile horizontally loading test destroys, and failure mode is that foundation soil strength destroys, and horizontal bearing capacity of single pile is by stake upper soil horizon strength control.Horizontal bearing capacity of single pile static loading test data see attached list 1.
Table 1 single pile horizontally loading test result summary sheet
The parts that the present embodiment does not describe in detail and structure belong to the well-known components of the industry and common structure or conventional means, do not describe one by one here.
Claims (3)
1. foundation single pile of wind power horizontal force bearing capacity Static Load Test Method, is characterized in that: the inner circle circle centre position of the first radius arranges the horizontal bearing capacity test pile of 1 pile casing type cast-in-place concrete pile as this basis; First radius arranges that 1 cast-in-place concrete pile is as horizontal bearing capacity anchoring pile; At anchoring pile and test pile, horizontal steel part base is set, jack is connected horizontally between anchoring pile and the horizontal steel part base of test pile, power is supplied to jack by electric high-voltage pump, by jack load is loaded on anchoring pile and test pile and carries out horizontal bearing capacity static loading test, payload values and test pile shift value is obtained, by computer recording and display test pile load, test pile shift value determination wind electric field fan foundation structure by pressure sensor and displacement transducer; Jack horizontal positioned between anchoring pile and test pile, jack connector there is levelness detecting sensor, test pile or anchoring pile displacement is detected by levelness detecting sensor, when anchoring pile displacement is large, the horizontal angle that levelness detecting sensor detects tilts to anchoring pile, when test pile displacement is large, the horizontal angle that levelness detecting sensor detects tilts to test pile, is obtained the horizontal movement of test pile by Triangle Formula;
Described horizontal bearing capacity test pile top spiral bar spacing 200mm, horizontal bearing capacity test pile top spiral bar diameter d=10mm, horizontal bearing capacity test pile length direction stirrup spacing 2000mm, the main muscle diameter d=22mm of horizontal bearing capacity test pile length direction, horizontal bearing capacity test pile length computation for required for bear the resistance of upper load in conjunction with side friction and main muscle end direction, horizontal bearing capacity test pile adopts pile casing type in conjunction with the construction technology of retaining wall.
2. foundation single pile of wind power horizontal force bearing capacity Static Load Test Method according to claim 1, is characterized in that: described horizontal bearing capacity of single pile static loading test comprises destructive testing and nondestructive testing.
3. foundation single pile of wind power horizontal force bearing capacity Static Load Test Method according to claim 1, is characterized in that: described horizontal bearing capacity distance between the anchor pile and the test pile: 3100mm.
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| CN110565704A (en) * | 2019-08-12 | 2019-12-13 | 中国能源建设集团江苏省电力设计院有限公司 | method for calculating horizontal loading force of single pile in static load test of fan |
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| CN103870692B (en) * | 2014-03-17 | 2017-05-03 | 上海岩土工程勘察设计研究院有限公司 | Pile foundation horizontal carrying force simplified calculation method |
| CN104563170B (en) * | 2015-01-14 | 2017-07-28 | 中国电建集团华东勘测设计研究院有限公司 | Offshore wind farm single-pile foundation horizontal bearing capacity tests counterforce device and its construction method |
| CN105200987A (en) * | 2015-07-05 | 2015-12-30 | 华东交通大学 | Inverted-ladder-shaped variable-section single-pile vertical bearing character analysis method |
| CN105178309B (en) * | 2015-07-06 | 2017-05-17 | 华东交通大学 | Internal force calculation method for single inverted stepped variable-cross-section pile |
| CN107794957B (en) * | 2017-11-24 | 2023-06-20 | 中交上海港湾工程设计研究院有限公司 | Super-large-diameter single pile foundation horizontal static load device and test method |
| CN114000551B (en) * | 2021-12-17 | 2023-06-06 | 中国华能集团清洁能源技术研究院有限公司 | Prefabricated sheet pile cylindrical foundation construction method easy to detect and bearing capacity detection method |
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