CN104563170B - Offshore wind farm single-pile foundation horizontal bearing capacity tests counterforce device and its construction method - Google Patents
Offshore wind farm single-pile foundation horizontal bearing capacity tests counterforce device and its construction method Download PDFInfo
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- CN104563170B CN104563170B CN201510018033.3A CN201510018033A CN104563170B CN 104563170 B CN104563170 B CN 104563170B CN 201510018033 A CN201510018033 A CN 201510018033A CN 104563170 B CN104563170 B CN 104563170B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
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- E02D33/00—Testing foundations or foundation structures
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Abstract
The present invention relates to a kind of offshore wind farm single-pile foundation horizontal bearing capacity experiment counterforce device and its construction method.It is an object of the invention to provide a kind of simple to operate, effect it is obvious, low to sea trial equipment requirement, save the offshore wind farm single-pile foundation horizontal bearing capacity of expense experiment counterforce device and its construction method.The technical scheme is that：The present invention has the test pile for squeezing into sea bed, and experiment pile head carries lower flange, and piece counter-force stake of sea bed is squeezed into the neighbouring inclination of test pile, and counter-force stake upper end is equipped with hydraulic jack system；Steel box-girder component is connected between test pile upper end and counter-force stake upper end, the component is made up of horizontal gird, vertical anchoring section and upper flange, horizontal gird is the rectangular enclosure of one section of variable diameters, on the periphery of horizontal gird one end injection diameter vertical anchoring section consistent with experiment pile head diameter, vertical anchoring section carries upper flange；The horizontal gird other end is free end and held out against with hydraulic jack top contact.
Description
Technical field
Counterforce device and its construction method are tested the present invention relates to a kind of offshore wind farm single-pile foundation horizontal bearing capacity, especially
For the horizontal antidumping single pile of offshore wind farm large scale pile foundation, big load, it is adaptable to which the ocean engineering such as Oversea wind power generation is led
Domain.
Background technology
The characteristics of offshore wind farm has high aboundresources, gas-to electricity hourage, clean environment firendly and suitable large-scale development,
The emphasis of Wind Power Generation was turned to sea by American-European countries in recent years, and many large-scale wind electricities exploitation enterprises, device fabrication enterprise are just
Trying to explore offshore wind farm development.
With the raising of offshore wind farm its construction level, the capacity of Wind turbines is also increasing, to structure security feature
It is required that more and more higher, the especially requirement to bearing capacity of pile foundation.Large diameter pile foundation bearing capacity characteristic is sought by experimental study
Method be current effective means.Horizontal bearing capacity of single pile experiment is at sea carried out to be difficult to aloft provide very big level
Power, experiment inconvenience is implemented.In addition, offshore wind farm single pile (diameter can reach 7m) is generally far larger than conventional offshore platform (such as stone
Oily platform single pile diameter is generally less than 2m), traditional single pile horizontal force experimental rig as shown in Figure 1, by four counter-forces stakes 103,
Two longerons 101, one with the crossbeam 102 be connected in the middle part of two longerons and the single experiment being supported on below crossbeam middle part
Stake 100 is constituted, and can be produced reaction force by applying active force to crossbeam 102 and be reached experiment purpose.But existing tradition examination
Proved recipe method can not meet the experiment counter-force needed for large diameter pile, therefore must seek a kind of new feasible horizontal bearing capacity of single pile examination
Proved recipe method.
The content of the invention
The technical problem to be solved in the present invention is：For above-mentioned problem, there is provided a kind of simple to operate, effect is bright
It is aobvious, low to sea trial equipment requirement, save expense offshore wind farm single-pile foundation horizontal bearing capacity experiment counterforce device and its
Construction method.
The technical solution adopted in the present invention is：A kind of offshore wind farm single-pile foundation horizontal bearing capacity tests counterforce device,
With the test pile for squeezing into sea bed, experiment pile head carries lower flange, it is characterised in that：Sea is squeezed into the neighbouring inclination of test pile
Piece counter-force stake of bed, counter-force stake upper end is equipped with hydraulic jack system；It is connected between the test pile upper end and counter-force stake upper end
Steel box-girder component, the component is made up of horizontal gird, vertical anchoring section and upper flange, and horizontal gird is the rectangle of one section of variable diameters
On cavity, the periphery of horizontal gird one end injection diameter vertical anchoring section consistent with experiment pile head diameter, vertical anchoring
Section carries upper flange；The horizontal gird other end is free end and held out against with hydraulic jack top contact.
The horizontal gird is welded with ribbed stiffener with vertical anchoring section junction.
The bottom of the horizontal gird free end is plane where the steel plate being in tilted layout, steel plate and counter-force stake axis
Vertically.
Ribbed stiffener is set up in the horizontal gird free end, scope of putting more energy into is end 3-4 meters.
The top of the test pile and counter-force stake is equipped with operating platform.
The construction method of described counterforce device, its step is as follows：
1st, test pile pile body is squeezed into sea bed, its lower end is goed deep into supporting course obtaining good steadiness, test pile stake
Head cutting is smooth and installs lower flange；Counter-force stake is tilted and squeezes into sea bed supporting course；
2nd, steel box-girder component is installed in test pile upper end, vertical anchoring section therein should cut smooth with lower flange joint
And upper flange is installed, upper and lower flange is connected with, and ribbed stiffener is welded at the mutually place of passing through of vertical anchoring section and horizontal gird；
The 3rd, hydraulic jack system is installed in counter-force stake top portion, adjusting position makes the head of hydraulic jack and level horizontal
The steel plate of beam free end bottom is held out against, hydraulic jack joint test instrument, installs measuring instrument；
4th, it is respectively mounted operating platform in the top workspace of test pile and counter-force stake；
5th, physical preservation, coat paint are carried out respectively to test pile and counter-force stake；
6th, horizontal bearing capacity of single pile load test is carried out according to testing program.
The beneficial effects of the invention are as follows：1st, big overturning moment caused by eminence horizontal force is changed to by counter-force stake by the present invention
Vertical force causes, and reaches the test objective that timber pile is pushed away with paxilla, so as to be difficult to the feelings for applying high-level power when avoiding operation on the sea
Condition, working face is reduced near sea level, reduces operation difficulty and test error；2nd, it is of the invention to testing equipment and anti-
Power apparatus requires low, can carry out load test in lower, reduce the requirement to extra large work testing equipment, can be provided with small size stake
Counter-force, material property utilization rate is maximized；3rd, the present invention in counter-force stake be correspondingly small in size, test after be readily disassembled, economy
Environmental protection；4th, simple in construction, cost of the invention is relatively low, and can short form test scheme, shorten the experiment used time, be that pre-construction phase is accurate
It is standby that plenty of time is provided.
Brief description of the drawings
Fig. 1 is traditional single pile horizontal force experimental rig schematic diagram.
Fig. 2 is experimental rig schematic diagram of the invention.
Fig. 3 is the flange connection diagram of experiment pile head and horizontal steel box-girder component in the present invention.
Fig. 4 is the connection diagram of test pile and horizontal steel box-girder component in the present invention.
Fig. 5 is the A-A sectional views of the connection of experiment pile head and horizontal steel box-girder component in the present invention.
Fig. 6 is experimental rig counter-force pile head jack imposed load schematic diagram of the invention.
Embodiment
The present embodiment is that offshore wind farm single-pile foundation horizontal bearing capacity tests counterforce device and its construction method, such as Fig. 2 institutes
Show, the device includes squeezing into sea bed face to the test pile 1 to obtain good stability of supporting course, is tilted near test pile 1
Counter-force stake 3 is squeezed on ground, and level is provided with steel box-girder component 2 between 3 upper ends of test pile 1 and counter-force stake, and in experiment
Stake 1 and 3 tops of counter-force stake are respectively arranged with operating platform 5, steel box-girder component 2 and the hydraulic jack system installed in counter-force 3 stake tops of stake
The very heavy top contact of system 6 is simultaneously held out against.Wherein, the stake top of test pile 1 is connected with lower flange 1-1, operating platform 5 be located at lower flange 1-
1 lower section；Steel box-girder component 2 is made up of horizontal gird 2-1, vertical anchoring section 2-2 and upper flange 2-3；Upper flange 2-3 with
It is bolted between lower flange 1-1 (such as Fig. 3), upper flange 2-3 upper ends connect vertical anchoring section 2-2 (such as Fig. 5), should
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, and length is regarded
Depending on load requirements, (by welding) vertical anchoring section 2-2 periphery is run through in the thicker one end of the crossbeam, and by putting more energy into
The reinforcement of weld of rib 4 (such as Fig. 4), it is ensured that the rigidity and reliability of connecting node；The thinner one end of horizontal gird 2-1 is free end, its
Bottom angled steel plate (provide tilting action face), steel plate are provided where plane should with counter-force 3 axis perpendiculars of stake, and
With hydraulic jack head contact and the steel plate (such as Fig. 6) is held out against, scope of putting more energy into is set up inside free end for 3~4 meters of end
Ribbed stiffener 4；The hydraulic jack of hydraulic jack system 6 is connected with test apparatus, installation measuring instrument.
In the present embodiment, depending on the size and driving depth of test pile 1 are typically according to testing program；Upper flange 2-3 is with
The tie point of flange 1-1 must do finite element analysis computation to formulate bolt quantity and ring flange size, to ensure that connection is reliable；
The tipping load that the size of steel box-girder component 2 need to be provided according to needed for experiment, is ensureing that occurring without strength failure and stability breaks
Horizontal gird 2-1 height, width, length and wall thickness is chosen on the premise of bad, the width of thicker one end should be less than vertical anchoring section
2-2 diameter, so as to which the vertical anchoring section 2-2 of horizontal gird 2-1 injection is welded to connect；Steel box-girder component 2 it is vertical
Anchoring section 2-2 need to occur without local failure as condition according to load tentative calculation to reach, carry out the selection of diameter and thickness, its steel
Material strength grade is generally greater than test pile 1；The quantity of ribbed stiffener 4 and taking for spacing must be determined by the calculating of weld seam calmly, to protect
Demonstrate,prove the rigidity and reliability of connecting node；The stake footpath of counter-force stake 3 is less than the stake footpath of test pile 1, when squeezing into sea bed face to supporting course
Angle of inclination, driving depth and counter-force stake size must meet the requirement that bearing capacity of pile foundation is more than required counter-force, if required anti-
The bearing capacity of power stake is huge, then counter-force stake can be steel tube concrete pile.
The present embodiment is utilized by applying active force to steel box-girder component 2 installed in the hydraulic jack of counter-force 3 stake tops of stake
Steel box-girder component 2 produces tilting moment and horizontal force to the test pile 1 of major diameter.Specific implementation method is as follows：
1st, the pile body of test pile 1 is squeezed into sea bed, its lower end is goed deep into supporting course obtaining good steadiness, test pile 1
Pile crown cutting is smooth and installs lower flange 1-1；Counter-force stake 3 is tilted and squeezes into sea bed supporting course；The size of test pile 1 and squeeze into
Depending on depth is typically according to testing program, to prevent from typically connecting one section of wall on pile body top to the destruction of pile body during driving piles
Thick relatively large pile cutoff；
2nd, steel box-girder component 2 is installed in the upper end of test pile 1, vertical anchoring section 2-2 therein should be cut with lower flange joint
Cut smooth and upper flange 2-3 is installed, upper and lower flange is connected with, in vertical anchoring section 2-2 and horizontal gird 2-1 phase
Pass through place's welding ribbed stiffener 4；Must carry out high standard processing to the steel plate and weld seam of steel box-girder component 2, and the quantity of ribbed stiffener 4 and
Away from take and must be determined calmly by the calculating of weld seam, to ensure the rigidity and reliability of connecting node；
3rd, hydraulic jack system 6 is installed at the top of counter-force stake 3, adjusting position makes head and the level of hydraulic jack
The steel plate of crossbeam 2-1 free ends bottom is held out against, as counter-force acting surface, and hydraulic jack joint test instrument, is installed and is surveyed
Measuring appratus；
4th, operating platform 5 is respectively mounted in the top workspace of test pile 1 and counter-force stake 3, for test pile 1, counter-force stake 3
Attended operation and Test Data Collecting with steel box-girder component 2；
5th, physical preservation, coat paint are carried out respectively to test pile 1 and counter-force stake 3；
6th, horizontal bearing capacity of single pile load test is carried out according to testing program.
Claims (5)
1. a kind of offshore wind farm single-pile foundation horizontal bearing capacity tests counterforce device, with the test pile (1) for squeezing into sea bed, experiment
Pile head carries lower flange (1-1), it is characterised in that：Piece counter-force stake (3) of sea bed is squeezed into the neighbouring inclination of test pile (1),
Counter-force stake upper end is equipped with hydraulic jack system (6)；Steel case is connected between test pile (1) upper end and counter-force stake (3) upper end
Beam assembly (2), the component is made up of horizontal gird (2-1), vertical anchoring section (2-2) and upper flange (2-3), horizontal gird
(2-1) is the rectangular enclosure of one section of variable diameters, horizontal gird (2-1) one end injection diameter and test pile (1) pile crown diameter one
On the periphery of the vertical anchoring section (2-2) caused, vertical anchoring section (2-2) carries upper flange (2-3)；Horizontal gird (2-
1) other end is free end and held out against with hydraulic jack top contact；
Plane where the bottom angled of horizontal gird (2-1) free end is disposed with steel plate, steel plate should be with counter-force stake (3)
Axis perpendicular, and with hydraulic jack head contact and hold out against the steel plate.
2. offshore wind farm single-pile foundation horizontal bearing capacity according to claim 1 tests counterforce device, it is characterised in that：Institute
State horizontal gird (2-1) and be welded with ribbed stiffener (4) with vertical anchoring section (2-2) junction.
3. offshore wind farm single-pile foundation horizontal bearing capacity according to claim 2 tests counterforce device, it is characterised in that：Institute
State and ribbed stiffener (4) is set up in horizontal gird (2-1) free end, scope of putting more energy into is end 3-4 meters.
4. offshore wind farm single-pile foundation horizontal bearing capacity according to claim 1 or 2 tests counterforce device, its feature exists
In：The top of the test pile (1) and counter-force stake (3) is equipped with operating platform (5).
5. a kind of construction method of counterforce device as claimed in claim 2, its step is as follows：
Test pile (1) pile body is squeezed into sea bed by 5.1, and its lower end is goed deep into supporting course obtaining good steadiness, test pile (1)
Pile crown cutting is smooth and installs lower flange (1-1)；Counter-force stake (3) is tilted and squeezes into sea bed supporting course；
5.2 install steel box-girder component (2), vertical anchoring section (2-2) therein and lower flange joint in test pile (1) upper end
It should cut smooth and upper flange (2-3) is installed, upper and lower flange is connected with, in vertical anchoring section (2-2) and horizontal gird
The mutually place of the passing through welding ribbed stiffener (4) of (2-1)；
5.3 install hydraulic jack system (6) at the top of counter-force stake (3), and adjusting position makes head and the level of hydraulic jack
The steel plate of crossbeam (2-1) free end bottom is held out against, hydraulic jack joint test instrument, installs measuring instrument；
5.4 are respectively mounted operating platform (5) in the top workspace of test pile (1) and counter-force stake (3)；
5.5 pairs of test piles (1) and counter-force stake (3) carry out physical preservation, coat paint respectively；
5.6 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 |
|---|---|---|---|
| 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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| CN104563170B true CN104563170B (en) | 2017-07-28 |
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| CN105887947B (en) * | 2016-06-12 | 2018-08-28 | 无锡市大筑岩土技术有限公司 | A kind of method for correcting error and its deviation correcting device of 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 |
| 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 |
| 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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| 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 |
| CN103046585B (en) * | 2013-01-28 | 2015-10-28 | 中国电建集团西北勘测设计研究院有限公司 | Foundation single pile of wind power horizontal force bearing capacity Static Load Test Method |
| 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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