CN104563170A - Offshore wind power generation mono-pile foundation horizontal bearing capacity test counterforce device and construction method thereof - Google Patents
Offshore wind power generation mono-pile foundation horizontal bearing capacity test counterforce device and construction method thereof Download PDFInfo
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- CN104563170A CN104563170A CN201510018033.3A CN201510018033A CN104563170A CN 104563170 A CN104563170 A CN 104563170A CN 201510018033 A CN201510018033 A CN 201510018033A CN 104563170 A CN104563170 A CN 104563170A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D33/00—Testing foundations or foundation structures
Abstract
The invention relates to an offshore wind power generation mono-pile foundation horizontal bearing capacity test counterforce device and a construction method thereof. The offshore wind power generation mono-pile foundation horizontal bearing capacity test counterforce device and the construction method thereof are simple in operation, obvious in effects, low in requirements on offshore testing equipment and capable of saving the cost. According to the technical scheme, the offshore wind power generation mono-pile foundation horizontal bearing capacity test counterforce device comprises a test pile driven into the seabed; the head portion of the test pile is provided with a lower flange; a counterforce pile is obliquely driven into the seabed near to the test pile, and the upper end of the counterforce pile is provided with a hydraulic jack system; a steel box girder module is connected between the upper end of the test pile and the upper end of the counterforce pile and composed of a horizontal beam, a vertical anchoring section and an upper flange, wherein the horizontal beam is a section of variable-diameter rectangular cavity, one end of the horizontal beam penetrates the circumferential surface of the vertical anchoring section with the diameter identical to that of the head portion of the test pile, the vertical anchoring section is provided with the upper flange, and the other end of the horizontal beam is a free end abutting against a hydraulic jack.
Description
Technical field
The present invention relates to a kind of offshore wind farm single-pile foundation horizontal bearing capacity test counterforce device and construction method thereof, especially for the horizontal overturning or slip resistance analysis single pile of offshore wind farm large scale pile foundation, large load, be applicable to the ocean engineering fields such as Oversea wind power generation.
Background technology
Offshore wind farm has that aboundresources, gas-to electricity hourage are high, the feature of clean environment firendly and suitable large-scale development, American-European countries all turned to sea the emphasis of Wind Power Generation in recent years, and many large-scale wind electricity develop enterprise, device fabrication enterprise are trying to explore offshore wind farm development.
Along with the raising of offshore wind farm its construction level, the capacity of Wind turbines is also increasing, more and more higher to the requirement of structural safety characteristic, especially to the requirement of bearing capacity of pile foundation.The method of large diameter pile foundation bearing capacity characteristic is sought in research is by experiment current effective means.Carry out horizontal bearing capacity of single pile test to be at sea difficult to provide very large horizontal force aloft, test inconvenience is implemented.In addition, offshore wind farm single pile (diameter can reach 7m) is generally far longer than conventional offshore platform (as oil platform single pile diameter is generally less than 2m), traditional single pile horizontal force experimental rig as shown in Figure 1, be made up of with the crossbeam 102 be connected in the middle part of two longerons and the single test pile 100 be supported on below in the middle part of crossbeam four counter-force stakes, 103, two longerons 101, experiment purpose can be reached by applying active force generation reaction force to crossbeam 102.But existing conventional test methods can not meet the test counter-force needed for large diameter pile, therefore a kind of feasible horizontal bearing capacity of single pile test method newly must be sought.
Summary of the invention
The technical problem to be solved in the present invention is: for above-mentioned Problems existing, provides a kind of simple to operate, successful, the offshore wind farm single-pile foundation horizontal bearing capacity test counterforce device of, cost saving low to sea trial equipment requirement and construction method thereof.
The technical solution adopted in the present invention is: a kind of offshore wind farm single-pile foundation horizontal bearing capacity test counterforce device, there is the test pile squeezing into sea bed, test pile pile crown is with lower flange, it is characterized in that: tilt to squeeze into sea bed counter-force stake near test pile, hydraulic jack system is equipped with in counter-force stake upper end; Steel box-girder assembly is connected with between described test pile upper end and counter-force stake upper end, this assembly is made up of horizontal gird, vertically anchoring section and upper flange, horizontal gird is the rectangular enclosure of one section of variable diameters, on the periphery of the vertical anchoring section that injection diameter in horizontal gird one end is consistent with test pile pile crown diameter, vertical anchoring section is with upper flange; The horizontal gird other end is free end and holds out against with hydraulic jack top contact.
Described horizontal gird and vertical anchoring section junction are welded with stiffening rib.
The steel plate of bottom for being in tilted layout of described horizontal gird free end, steel plate place plane and counter-force stake axes normal.
Set up stiffening rib in described horizontal gird free end, the scope of putting more energy into is end 3-4 rice.
The top of described test pile and counter-force stake is equipped with operating platform.
The construction method of described counterforce device, its step is as follows:
1, test pile pile body is squeezed into sea bed, its lower end is goed deep into bearing stratum to obtain good steadiness, and test pile pile crown cuts smooth and installs lower flange; Counter-force stake is tilted to squeeze into sea bed bearing stratum;
2, install steel box-girder assembly in test pile upper end, vertical anchoring section wherein and lower flange joint should cut smooth and install flange, and upper and lower flange bolt connects, and weld stiffening rib at vertical anchoring section with the place of passing through mutually of horizontal gird;
3, install hydraulic jack system at counter-force stake top, adjusting position, the steel plate bottom the head of hydraulic jack and horizontal gird free end is held out against, and hydraulic jack joint test instrument, installs and measures instrument;
4, fitting operation platform is distinguished in the workspace, top of test pile and counter-force stake;
5, respectively physical preservation is carried out, coat paint to test pile and counter-force stake;
6, horizontal bearing capacity of single pile load test is carried out according to testing program.
The invention has the beneficial effects as follows: the large overturning moment that 1, eminence horizontal force causes by the present invention changes into and being caused by the vertical force of counter-force stake, reach the test objective pushing away timber pile with paxilla, thus when avoiding operation on the sea, be difficult to the situation applying high-level power, working face is reduced near sea level, reduces operation easier and testing error; 2, the present invention requires low to testing equipment and counterforce device, and can carry out load test at lower, reduce the requirement to extra large work testing equipment, available small size stake provides counter-force, material property utilization rate is maximized; 3, the counter-force stake relative size in the present invention is little, be easy to dismounting, economic environmental protection after test; 4, structure of the present invention is simple, cost is lower, and can short form test scheme, shorten the test used time, for pre-construction phase prepares to provide plenty of time.
Accompanying drawing explanation
Fig. 1 is traditional single pile horizontal force experimental rig schematic diagram.
Fig. 2 is experimental rig schematic diagram of the present invention.
Fig. 3 is the Flange joint schematic diagram testing pile head and horizontal steel box-girder assembly in the present invention.
Fig. 4 is the connection diagram of test pile and horizontal steel box-girder assembly in the present invention.
Fig. 5 is the A-A sectional view of the connection testing pile head and horizontal steel box-girder assembly in the present invention.
Fig. 6 is experimental rig counter-force pile head jack imposed load schematic diagram of the present invention.
Detailed description of the invention
The present embodiment is offshore wind farm single-pile foundation horizontal bearing capacity test counterforce device and construction method thereof, as shown in Figure 2, this device comprises squeezes into the test pile 1 to obtain good stability of sea bed face to bearing stratum, a counter-force stake 3 is squeezed into obliquely near test pile 1, between test pile 1 and counter-force stake 3 upper end, level is provided with steel box-girder assembly 2, and at test pile 1 and counter-force stake 3 top, operating platform 5 being all housed, steel box-girder assembly 2 contacts with the jack being arranged on the hydraulic jack system 6 that counter-force stake 3 is pushed up and holds out against.Wherein, test pile 1 top is connected with lower flange 1-1, and operating platform 5 is located at the below of lower flange 1-1; Steel box-girder assembly 2 is made up of horizontal gird 2-1, vertically anchoring section 2-2 and upper flange 2-3; Be bolted (as Fig. 3) between upper flange 2-3 and lower flange 1-1, upper flange 2-3 upper end vertical connecting anchoring section 2-2 (as Fig. 5), this anchoring section is the steel cylinder matched with the diameter of test pile 1; Horizontal gird 2-1 is the rectangular enclosure of one section of variable diameters, length apparent load demand and determining, the periphery of one end that this crossbeam is thicker is run through (by welding) vertical anchoring section 2-2, and by stiffening rib 4 reinforcement of weld (as Fig. 4), ensure rigidity and the reliability of connected node; The thinner one end of horizontal gird 2-1 is free end, its bottom angled be furnished with steel plate (tilting action face is provided), steel plate place plane should with counter-force stake 3 axis perpendicular, and hold out against this steel plate (as Fig. 6) with hydraulic jack head contact, set up in free end inside the stiffening rib 4 that the scope of putting more energy into is 3 ~ 4 meters, end; The hydraulic jack of hydraulic jack system 6 and test apparatus, install and measure instrument and be connected.
In the present embodiment, size and the depth of drive of test pile 1 are generally determined according to testing program; The tie point of upper flange 2-3 and lower flange 1-1 must do finite element analysis computation to formulate bolt quantity and flange size, to ensure to connect reliably; The tipping load that the size of steel box-girder assembly 2 need provide needed for test, the height of horizontal gird 2-1, wide, length and wall thickness is chosen under the prerequisite ensureing not occur that strength failure and stability are destroyed, the width of thicker one end should be less than the diameter of vertical anchoring section 2-2, to be welded to connect by vertical for horizontal gird 2-1 injection anchoring section 2-2; To reach, the vertical anchoring section 2-2 of steel box-girder assembly 2 according to load tentative calculation, need not occur that local failure is for condition, carry out choosing of diameter and thickness, its strength classes of structural steel is generally higher than test pile 1; The getting of quantity and spacing of stiffening rib 4 must be determined by the calculating of weld seam calmly, to ensure rigidity and the reliability of connected node; The stake footpath of counter-force stake 3 is less than the stake footpath of test pile 1, squeeze into sea bed face to angle of inclination during bearing stratum, depth of drive and counter-force stake size and must meet the requirement that bearing capacity of pile foundation is greater than required counter-force, if the bearing capacity of required counter-force stake is huge, then counter-force stake can be steel tube concrete pile.
The present embodiment applies active force by the hydraulic jack being arranged on counter-force stake 3 top to steel box-girder assembly 2, utilizes steel box-girder assembly 2 to produce overturning moment and horizontal force to large diameter test pile 1.Specific implementation method is as follows:
1, test pile 1 pile body is squeezed into sea bed, its lower end is goed deep into bearing stratum to obtain good steadiness, and test pile 1 pile crown cuts smooth and installs lower flange 1-1; Counter-force stake 3 is tilted to squeeze into sea bed bearing stratum; Size and the depth of drive of test pile 1 are generally determined according to testing program, for preventing generally connecting the relatively large pile cutoff of one section of wall thickness to the destruction of pile body on pile body top in piling process;
2, in test pile 1 upper end, steel box-girder assembly 2 is installed, vertical anchoring section 2-2 wherein and lower flange joint should cut smooth and install flange 2-3, upper and lower flange bolt connects, and welds stiffening rib 4 at vertical anchoring section 2-2 with the place of passing through mutually of horizontal gird 2-1; High standard process must be carried out to the steel plate of steel box-girder assembly 2 and weld seam, and getting of the quantity and spacing of stiffening rib 4 must be determined by the calculating of weld seam calmly, to ensure rigidity and the reliability of connected node;
3, install hydraulic jack system 6 at counter-force stake 3 top, adjusting position, makes the steel plate bottom the head of hydraulic jack and horizontal gird 2-1 free end hold out against, as counter-force acting surface, and hydraulic jack joint test instrument, install and measure instrument;
4, the fitting operation platform 5 respectively in the workspace, top of test pile 1 and counter-force stake 3, for attended operation and the Test Data Collecting of test pile 1, counter-force stake 3 and steel box-girder assembly 2;
5, respectively physical preservation is carried out, coat paint to test pile 1 and counter-force stake 3;
6, horizontal bearing capacity of single pile load test is carried out according to testing program.
Claims (6)
1. an offshore wind farm single-pile foundation horizontal bearing capacity test counterforce device, there is the test pile (1) squeezing into sea bed, test pile pile crown is with lower flange (1-1), it is characterized in that: near test pile (1), sea bed counter-force stake (3) is squeezed in inclination, and hydraulic jack system (6) is equipped with in counter-force stake upper end; Steel box-girder assembly (2) is connected with between described test pile (1) upper end and counter-force stake (3) upper end, this assembly is made up of horizontal gird (2-1), vertically anchoring section (2-2) and upper flange (2-3), horizontal gird (2-1) is the rectangular enclosure of one section of variable diameters, on the periphery of the vertical anchoring section (2-2) that horizontal gird (2-1) one end injection diameter is consistent with test pile (1) pile crown diameter, vertical anchoring section (2-2) is with upper flange (2-3); Horizontal gird (2-1) other end is free end and holds out against with hydraulic jack top contact.
2. offshore wind farm single-pile foundation horizontal bearing capacity test counterforce device according to claim 1, is characterized in that: described horizontal gird (2-1) and vertical anchoring section (2-2) junction are welded with stiffening rib (4).
3. offshore wind farm single-pile foundation horizontal bearing capacity test counterforce device according to claim 1 and 2, it is characterized in that: the steel plate of bottom for being in tilted layout of described horizontal gird (2-1) free end, steel plate place plane and counter-force stake (3) axes normal.
4. offshore wind farm single-pile foundation horizontal bearing capacity test counterforce device according to claim 3, it is characterized in that: set up stiffening rib (4) in described horizontal gird (2-1) free end, the scope of putting more energy into is end 3-4 rice.
5. offshore wind farm single-pile foundation horizontal bearing capacity test counterforce device according to claim 1 and 2, is characterized in that: the top of described test pile (1) and counter-force stake (3) is equipped with operating platform (5).
6. a construction method for counterforce device as claimed in claim 3, its step is as follows:
Test pile (1) pile body is squeezed into sea bed by 6.1, and its lower end is goed deep into bearing stratum to obtain good steadiness, and test pile (1) pile crown cuts smooth and installs lower flange (1-1); Counter-force stake (3) is tilted to squeeze into sea bed bearing stratum;
6.2 install steel box-girder assembly (2) in test pile (1) upper end, vertical anchoring section (2-2) wherein and lower flange joint should cut smooth and install flange (2-3), upper and lower flange bolt connects, and welds stiffening rib (4) at vertical anchoring section (2-2) with the place of passing through mutually of horizontal gird (2-1);
6.3 install hydraulic jack system (6) at counter-force stake (3) top, adjusting position, steel plate bottom the head of hydraulic jack and horizontal gird (2-1) free end is held out against, and hydraulic jack joint test instrument, installs and measures instrument;
6.4 distinguish fitting operation platform (5) in the workspace, top of test pile (1) and counter-force stake (3);
6.5 pairs of test piles (1) and counter-force stake (3) carry out physical preservation, coat paint respectively;
6.6 carry out horizontal bearing capacity of single pile load test according to testing program.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510018033.3A CN104563170B (en) | 2015-01-14 | 2015-01-14 | Offshore wind farm single-pile foundation horizontal bearing capacity tests counterforce device and its construction method |
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| CN201510018033.3A CN104563170B (en) | 2015-01-14 | 2015-01-14 | Offshore wind farm single-pile foundation horizontal bearing capacity tests counterforce device and its construction method |
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| CN104563170A true CN104563170A (en) | 2015-04-29 |
| CN104563170B CN104563170B (en) | 2017-07-28 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105887947A (en) * | 2016-06-12 | 2016-08-24 | 无锡市大筑岩土技术有限公司 | Deviation rectification method and device for pile foundation inclination |
| CN106120879A (en) * | 2016-08-24 | 2016-11-16 | 上海勘测设计研究院有限公司 | Marine wind electric field fan single-pile foundation test pile supporting construction with cantilever design and construction method thereof |
| CN107794957A (en) * | 2017-11-24 | 2018-03-13 | 中交上海港湾工程设计研究院有限公司 | The horizontal static load device of super-large diameter single-pile foundation and test method |
| CN110185074A (en) * | 2019-06-26 | 2019-08-30 | 金陵科技学院 | A kind of taper pile model test apparatus and test method |
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| JP2011102527A (en) * | 2009-10-13 | 2011-05-26 | Japan Pile Corp | Horizontal load testing method of pile |
| CN103046585A (en) * | 2013-01-28 | 2013-04-17 | 中国水电顾问集团西北勘测设计研究院 | Method for testing horizontal force bearing capacity static load of foundation single pile of wind power plant fan |
| CN203034498U (en) * | 2013-01-07 | 2013-07-03 | 中国建筑第六工程局有限公司 | Horizontal bearing capability test device of piles in permafrost region |
| CN203145066U (en) * | 2013-02-28 | 2013-08-21 | 中国水电顾问集团华东勘测设计研究院 | Offshore single-pile basic horizontal carrying force loading device |
| CN204530794U (en) * | 2015-01-14 | 2015-08-05 | 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 test counterforce device |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2011102527A (en) * | 2009-10-13 | 2011-05-26 | Japan Pile Corp | Horizontal load testing method of pile |
| CN203034498U (en) * | 2013-01-07 | 2013-07-03 | 中国建筑第六工程局有限公司 | Horizontal bearing capability test device of piles in permafrost region |
| CN103046585A (en) * | 2013-01-28 | 2013-04-17 | 中国水电顾问集团西北勘测设计研究院 | Method for testing horizontal force bearing capacity static load of foundation single pile of wind power plant fan |
| CN203145066U (en) * | 2013-02-28 | 2013-08-21 | 中国水电顾问集团华东勘测设计研究院 | Offshore single-pile basic horizontal carrying force loading device |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105887947A (en) * | 2016-06-12 | 2016-08-24 | 无锡市大筑岩土技术有限公司 | Deviation rectification method and device for pile foundation inclination |
| CN106120879A (en) * | 2016-08-24 | 2016-11-16 | 上海勘测设计研究院有限公司 | Marine wind electric field fan single-pile foundation test pile supporting construction with cantilever design and construction method thereof |
| CN107794957A (en) * | 2017-11-24 | 2018-03-13 | 中交上海港湾工程设计研究院有限公司 | The horizontal static load device of super-large diameter single-pile foundation and test method |
| CN110185074A (en) * | 2019-06-26 | 2019-08-30 | 金陵科技学院 | A kind of taper pile model test apparatus and test method |
| CN110185074B (en) * | 2019-06-26 | 2023-10-20 | 金陵科技学院 | Inclined pile model test device and test method |
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| Publication number | Publication date |
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| CN104563170B (en) | 2017-07-28 |
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