CN108571425B - Pile foundation cap foundation of offshore wind turbine generator set and construction method thereof - Google Patents
Pile foundation cap foundation of offshore wind turbine generator set and construction method thereof Download PDFInfo
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- CN108571425B CN108571425B CN201810622174.XA CN201810622174A CN108571425B CN 108571425 B CN108571425 B CN 108571425B CN 201810622174 A CN201810622174 A CN 201810622174A CN 108571425 B CN108571425 B CN 108571425B
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- 238000010276 construction Methods 0.000 title claims abstract description 26
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 374
- 239000010959 steel Substances 0.000 claims abstract description 374
- 239000000463 material Substances 0.000 claims abstract description 18
- 238000009434 installation Methods 0.000 claims abstract description 10
- 210000005069 ears Anatomy 0.000 claims abstract description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 4
- 238000007789 sealing Methods 0.000 claims description 4
- 235000017166 Bambusa arundinacea Nutrition 0.000 claims 1
- 235000017491 Bambusa tulda Nutrition 0.000 claims 1
- 241001330002 Bambuseae Species 0.000 claims 1
- 241000196324 Embryophyta Species 0.000 claims 1
- 235000015334 Phyllostachys viridis Nutrition 0.000 claims 1
- 239000011425 bamboo Substances 0.000 claims 1
- 238000005096 rolling process Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 239000011150 reinforced concrete Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
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- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000009417 prefabrication Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D13/00—Assembly, mounting or commissioning of wind motors; Arrangements specially adapted for transporting wind motor components
- F03D13/20—Arrangements for mounting or supporting wind motors; Masts or towers for wind motors
- F03D13/25—Arrangements for mounting or supporting wind motors; Masts or towers for wind motors specially adapted for offshore installation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D13/00—Assembly, mounting or commissioning of wind motors; Arrangements specially adapted for transporting wind motor components
- F03D13/10—Assembly of wind motors; Arrangements for erecting wind motors
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/727—Offshore wind turbines
Abstract
The invention discloses a pile foundation of an offshore wind generating set, which comprises a steel pipe pile and a steel pile cap, wherein one end of a steel box girder of the steel pile cap is provided with a steel pile cap pile leg, the steel pile cap pile leg is sleeved in the steel pipe pile, the steel pipe pile is positioned and hammered by adopting a positioning mould frame, the positioning mould frame comprises a truss support pile, a positioning truss and a double-layer steel sleeve, the positioning truss is connected with the truss support pile through the double-layer steel sleeve, the center of the outer end of each support part of the positioning truss is provided with a tap for accommodating the steel pipe pile, each tap is at least provided with an upper pile anchor ear and a lower pile anchor ear, the steel pipe pile is tightly held and fixed by the pile anchor ears, and grouting materials are poured in an annular gap at the connecting part of the steel pipe pile and the steel pile cap pile leg to form a whole. The steel pipe pile and the steel bearing platform can be manufactured in the steel structure processing factory in advance, and only pile driving, installation and grouting operations are needed on the offshore construction site, so that the offshore workload is greatly reduced.
Description
Technical Field
The invention relates to the field of hydraulic buildings, in particular to a pile foundation pile cap foundation of an offshore wind generating set.
Background
Pile foundations are important structural types of offshore structures, and single pile foundations, jacket foundations and high pile cap foundations are commonly arranged in offshore wind turbine generator set foundations at present.
The single pile foundation belongs to a non-space structure due to the fact that the pile foundation is unique, the acting force arm is small, in order to meet the load transmitted by the wind generating set and the effect of various environmental loads, the pile diameter is required to be large, the pile diameter is basically larger than 7m, the requirement on equipment capacity is high during construction, and the construction difficulty is high.
The jacket foundation structure is complicated, the member nodes are many, and the process is loaded down with trivial details. The jacket is bulky and requires a larger transport vessel for transport. In addition, the jacket and the foundation pile foundation are connected underwater, so that the construction difficulty is high and the reliability is low.
High pile cap foundations are commonly arranged on wharfs and pier foundations, most of the caps are of cast-in-situ reinforced concrete structures, the high pile cap foundations are limited by high wind and high waves in a marine wind power field, the marine construction efficiency is low, potential safety hazards exist, and the cost is high. In addition, the reinforced concrete bearing platform has large weight and poor earthquake resistance of the whole structure.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides the pile foundation cap foundation of the offshore wind turbine generator set, which can reduce the operation time of offshore construction, has small influence on the surrounding area environment in the construction process, and has simple structure and small construction difficulty.
In order to achieve the above purpose, the present invention adopts the following technical scheme: the pile foundation of the offshore wind generating set comprises a plurality of steel pipe piles and a steel pile cap, wherein the steel pile cap is provided with a central box body and a plurality of steel box girders which extend outwards from the central box body, the top of the central box body is provided with a flange plate connected with a tower cylinder of the wind generating set, one end of each steel box girder far away from the central box body is provided with steel pile cap legs, the number of the steel pile cap legs is consistent with that of the steel pipe piles and sleeved in the corresponding steel pipe piles, the steel pipe piles adopt a positioning die carrier to position hammering pile sinking, the positioning die carrier comprises a truss supporting pile which is positioned at the center and corresponds to the center of the steel pile cap, a positioning truss and a double-layer steel sleeve which surrounds the outside of the truss supporting pile, the double-layer steel sleeve consists of an inner steel cylinder, an outer steel cylinder and a top cover which are coaxial and have different diameters, the double-layer steel sleeve is fixed together with the positioning truss through the node, the truss support pile is sleeved between the inner steel cylinder and the outer steel cylinder of the double-layer steel sleeve, the positioning truss is connected with the truss support pile through the double-layer steel sleeve, the positioning truss extends outwards from the double-layer steel sleeve to form a plurality of support parts with uniform intervals, the positions and the number of the support parts are consistent with those of the steel pipe piles, the center of the outer end of each support part is provided with a tap for accommodating the steel pipe pile, each tap is at least provided with an upper pile hoop and a lower pile hoop, the pile hoops tightly hold the steel pipe pile, and grouting materials are poured into an annular gap at the connection part of the steel pipe pile and the pile leg of the steel pile cap to connect the steel pipe pile and the pile leg of the steel pile cap to form a whole.
The part of the steel bearing platform pile leg connected with the steel pipe pile is positioned above the water surface line.
The pile anchor ear consists of a movable arm, a fixed back frame, a holding jack and rollers, wherein the movable arm, the fixed back frame, the holding jack and the rollers are bilaterally symmetrical, the fixed back frame is fixed relative to the positioning truss, the middle part of the movable arm is hinged to the fixed back frame, the first end of the movable arm is connected to the extending end of a piston rod of the holding jack, the second end of the movable arm is provided with the rollers which can roll along the pile body of the steel pipe pile, the piston rod of the holding jack extends outwards or contracts inwards from the end part of the fixed back frame respectively, and when the piston rod of the holding jack is in an extending state, the second end of the movable arm compresses the steel pipe pile inwards; when the piston rod of the holding jack is contracted inwards, the second end of the movable arm extends outwards to be far away from the steel pipe pile.
The inner diameter of the outer steel cylinder of the double-layer steel sleeve is 2-5 cm larger than the outer diameter of the truss support pile, the outer diameter of the steel pipe in the double-layer steel sleeve is 2-5 cm smaller than the inner diameter of the truss support pile, and a plurality of locking bolts penetrating through the wall of the outer steel cylinder and fixing the truss support pile in the double-layer steel sleeve are arranged at the lower part of the outer steel cylinder.
Each steel pile cap pile leg outwards extends from the outer wall to form a steel corbel located above the steel pipe pile, the pile cap foundation of the offshore wind turbine generator system adopts a steel pile cap supporting and leveling system to conduct steel pile cap leveling, the steel pile cap supporting and leveling system comprises a plurality of sets of leveling pile clamping devices, each steel pile cap pile leg is supported on the steel pipe pile through three sets of leveling pile clamping devices, each set of leveling pile clamping devices comprises a radial jack, an axial jack and a fastening piece, the three sets of leveling pile clamping devices are uniformly distributed along the circumferential direction of the steel pipe pile, the fastening pieces are reversely buckled on the top end of the steel pipe pile and are fixed on the wall of the steel pipe pile through locking bolts, the fastening pieces upwards extend to form supporting vertical plates, the radial jacks are fixed on the supporting vertical plates, piston rods of the radial jacks are pressed on the outer wall of the pile cap pile legs, the top of the supporting vertical plates are provided with supporting transverse plates, the axial jacks are arranged on the supporting transverse plates, piston rods of the axial jacks are supported on the bottoms of the steel corbel, and the radial jacks and the axial jacks are connected with a microprocessor through circuits.
The steel bearing platform supporting and leveling system further comprises two inclination sensors which are arranged on the flange surface of the steel bearing platform and connected to the microprocessor, and the two inclination sensors are respectively arranged at two positions which are mutually radial and perpendicular on the flange surface.
The bottom of the pile leg of the steel bearing platform is provided with an annular basin-shaped rubber sealing ring so that the outer wall of the pile leg and the inner wall of the steel pipe pile form a closed state.
The construction method of the pile foundation cap foundation of the offshore wind turbine generator set, which comprises the following steps:
(1) And (3) performing truss support pile driving: a truss support pile is applied to the center of the steel bearing platform;
(2) And (3) positioning truss installation: prefabricating the positioning truss on the shore, transporting the whole barge to a construction site, hoisting by a water hoisting platform, inserting a double-layer steel sleeve in the center of the positioning truss into a truss support pile, locking and fixing the double-layer steel sleeve and the truss support pile, and finishing the installation of the positioning truss;
(3) And (3) positioning the steel pipe pile: prefabricating the steel pipe pile on the shore, transporting a barge to a construction site, opening an upper pile anchor ear and a lower pile anchor ear, hanging a sling of a water hoisting platform to buckle a hanging point at the top of the steel pipe pile, moving the hoisting arm support after the steel pipe pile is erected to enable the steel pipe pile to enter the anchor ear of the positioning truss portal pile, folding the upper pile anchor ear and the lower pile anchor ear, lowering the steel pipe pile after confirming the position, and unlocking the sling;
(4) And (3) performing steel pipe pile driving: lifting the hydraulic hammer to the top of the steel pipe pile by using a lifting platform sling on water, measuring the position of the steel pipe pile again, starting the hydraulic hammer to perform driving after confirming that the hydraulic hammer meets the requirements, checking the position of the steel pipe pile synchronously, adjusting the position of the steel pipe pile by using a pile anchor ear when the hydraulic hammer does not meet the requirements, continuously performing driving of the steel pipe pile until the top elevation meets the requirements, stopping the hydraulic hammer and lifting away from the top of the steel pipe pile, and sequentially performing driving of other two steel pipe piles;
(5) Dismantling a positioning die carrier: firstly, opening a pile hoop, releasing the locking bolt connection between the double-layer steel sleeve and the truss support pile, lifting the positioning truss by adopting an overhead lifting platform, then placing the positioning truss on a transport barge, hanging a vibrating hammer on a sling hook of the overhead lifting platform, shifting to the truss support pile, clamping, starting the vibrating hammer and a winch, and pulling the truss support pile upwards until the truss support pile is pulled out completely and is horizontally placed on the transport barge;
(6) And (3) mounting a steel bearing platform: the steel pile cap is manufactured in an onshore steel structure processing plant, the barge is transported to a construction site, a water hoisting platform is used for hoisting and installing, three pile legs of the steel pile cap are all slid into three steel pipe piles which are applied in advance, three leveling pile clamps are uniformly arranged at the position of each steel pipe pile top corresponding to the steel corbel of the pile leg of the steel pile cap, and the weight of the steel pile cap is supported by the leveling pile clamps;
(7) Leveling the steel bearing platform: radial and axial jacks are arranged on each leveling pile clamping device, 2 inclination sensors are arranged on the flange surface at the top of the steel bearing platform, the data display the posture of the steel bearing platform to constructors through a display circuit, and a microprocessor adjusts the elevation and the position of pile legs of the steel bearing platform through controlling the 18 jacks on the nine sets of leveling pile clamping devices on the three steel pipe piles, so that the levelness of the flange plate of the steel bearing platform is adjusted. The pile leg axis of the steel bearing platform is overlapped with the steel pipe pile axis, and meanwhile, the flange plate of the steel bearing platform is kept to be horizontal and meets the requirements;
(8) Grouting connection: grouting materials are filled in an annular gap formed between the pile leg of the steel bearing platform and the steel pipe pile, grouting pipes of a grouting machine are respectively connected with three grouting holes on the wall of the steel pipe pile, the grouting machine is started to press the grouting materials into the annular gap until the grouting materials overflow from the top of the steel pipe pile, the grouting holes are closed, equipment is evacuated, and other two steel pipe piles are sequentially poured;
(9) Dismantling a steel bearing platform supporting and leveling system: after the grouting material is hardened, the connection of the pile legs of the steel bearing platform and the steel pipe piles is completed, and the steel bearing platform supporting and leveling system is dismantled to complete the pile foundation bearing platform foundation of the offshore wind turbine generator system.
Compared with the prior art, the invention has the beneficial effects that:
the steel pipe pile and the steel bearing platform can be manufactured in the steel structure processing factory in advance, and only pile driving, installation and grouting operations are needed on the offshore construction site, so that the offshore workload is greatly reduced. The connection part of the steel pipe pile and the pile leg of the steel bearing platform is arranged on water, and is connected through grouting, so that the leveling is easy, and the construction difficulty is low. All operations are above the water surface, so that the method is safe and reliable; the invention has light structure, the steel pipe pile deviates from the central shaft of the tower barrel of the wind generating set by a longer distance, and the acting force arm is long, so that the overturning moment generated by the wind generating set is effectively resisted; the invention is convenient for transportation and has low construction cost. The steel pipe pile sinking pile positioning die carrier can ensure the accurate relative position between the steel pipe piles, the positioning truss and the truss support pile are connected in an inserted mode, the installation and the dismantling are easy to operate, and the steel pipe pile sinking pile positioning die carrier can be reused. The wind generating set has very high requirement on the verticality of the tower barrel, which is not more than three thousandths, so that the steel bearing platform connected with the tower barrel is required to have very high horizontal precision.
Drawings
The invention will be further described with reference to the drawings and examples.
FIG. 1 is a front view of the foundation of the offshore wind turbine of the present invention.
Fig. 2 is a top view of a steel cap of the foundation of an offshore wind park.
Fig. 3 is a schematic diagram of the plug-in connection of the steel pile cap legs and the steel pipe piles.
Fig. 4 is a top view of a pile sinking positioning die carrier.
Fig. 5 is a front view of a pile sinking positioning die carrier.
Fig. 6 is a schematic view of a truss support pile double layer steel sleeve.
Fig. 7 is a schematic view of the pile anchor (closed).
FIG. 8 is a schematic view of a pile anchor ear (open)
Fig. 9 is a schematic view of a steel cap leveling clip.
FIG. 10 is a schematic diagram of the wiring of the steel cap support leveling system.
Wherein,
steel pipe pile 1, steel bearing platform 2, wind generating set tower 3, flange 4, pile leg 5, center box 6, overhanging steel box girder 7, grouting material 8, grouting hole 9, truss support pile 10, positioning truss 11, hydraulic hammer 12, steel corbel 13, axial jack 14, radial jack 15, leveling pile clamp locking bolt 16, pile anchor ear 17, inclination sensor 18, leveling pile clamp 19, outer steel cylinder 20, inner steel cylinder 21, locking bolt 22, top cover 23, double-layer steel sleeve 24, holding jack 25, roller 26, movable arm 27, fixed back frame 28, tap 29, jack split hub 30, jack master hub 31, microprocessor 32, display circuit 33, alarm circuit 34, power circuit 35, fastener 36, basin-type rubber seal ring 37
Detailed Description
As shown in fig. 1, the offshore wind turbine generator system of the present invention comprises three steel pipe piles 1 and a steel bearing platform 2. The upper portion of the steel bearing platform 2 is provided with a flange 4 connected with the tower 3 of the wind generating set, the steel bearing platform is provided with a central box 6 and a plurality of steel box girders 7 extending outwards from the central box, the top of the central box 6 is provided with the flange 4 connected with the tower 3 of the wind generating set, and longitudinal and transverse reinforced steel rib plates are arranged in the box.
And one end of each steel box girder, which is far away from the central box body, is provided with steel bearing platform spud legs 5, and the number of the steel bearing platform spud legs is consistent with that of the steel pipe piles and sleeved in the corresponding steel pipe piles.
As shown in fig. 9, a steel corbel 13 extending outward from the outer wall of the steel cap leg is provided above the steel pipe pile 1. When the steel bearing platform 2 is installed, the steel bearing platform pile legs 5 are inserted into the steel pipe piles 1, leveling pile clamps 19 are arranged between the steel corbels 13 and the tops of the steel pipe piles 1, and the weight of the whole steel bearing platform 2 is supported and accurately leveled by nine sets of leveling pile clamps distributed on the three steel pipe piles 1. After leveling, grouting materials are poured into gaps between the inner wall of the steel pipe pile 1 and the steel bearing platform pile legs 3, and the steel pipe pile and the steel bearing platform pile legs are connected to form a whole after the grouting materials are hardened.
In order to ensure the accurate position of the pile sinking of the steel pipe pile, the invention designs a pile sinking positioning die carrier of a foundation of an offshore wind generating set, and the positioning die carrier is composed of a truss support pile 10 positioned at the center, a positioning truss 11 surrounding the outer part of the truss support pile and a double-layer steel sleeve 24 as shown in fig. 4 and 5. The truss support pile is a large-diameter steel pipe pile with a diameter of more than 8 meters, preferably 8-15 meters.
The positioning truss 11 extends from the double-layer steel sleeve 24 to the outside to form three branch parts with uniform intervals, each branch part corresponds to one steel pipe pile to be driven, and the center of the outer end of each branch part is provided with a tap 29 for accommodating the steel pipe pile. The positioning truss 11 and the truss support pile 10 are connected together by a double layer steel sleeve 24. As shown in fig. 6, the double-layer steel sleeve 24 is composed of an inner steel cylinder 21, an outer steel cylinder 20, a top cover 23, and a lock bolt 22 having different diameters. The diameter relation among the outer steel cylinder 20, the truss support pile 10 and the inner steel cylinder 21 is as follows: the outer steel cylinder inner diameter is greater than the truss support pile outer diameter, and the truss support pile inner diameter is greater than the inner steel cylinder outer diameter, preferably at a distance of 2-5 cm, to facilitate insertion of the truss support pile 10 into the double-layer steel sleeve 24 during installation. The lower portion of the outer steel cylinder is provided with a plurality of locking bolts penetrating the cylinder wall to fix the truss support pile 10 in the double-layer steel sleeve 24. The double-layer steel sleeve 24 and the positioning truss 11 are fixed together through joints, and joint steel plates for fixing the joints together are welded on the outer wall of the double-layer steel sleeve 24. The double-layer steel sleeve is reversely buckled at the top of the truss support pile, and the truss support pile is sleeved between the inner steel cylinder and the outer steel cylinder of the double-layer steel sleeve and is locked and fixed through the locking bolt.
As shown in fig. 5, the positioning truss at each tap position is provided with an upper pile anchor ear 17 and a lower pile anchor ear 17, the pile anchor ear 17 is connected with the positioning truss 11 through a connecting rod, and the steel pipe pile 1 is fixed and positioned through the upper pile anchor ear 17 and the lower pile anchor ear 17 during pile sinking. As shown in fig. 7 and 8, the pile anchor ear 17 is composed of a left-right symmetrical movable arm 27, a fixed back frame 28, a holding jack 25 and a roller 26, wherein the fixed back frame 28 is fixed relative to the positioning truss, the middle part of the movable arm 27 is hinged to the fixed back frame 28 and can rotate around the fixed shaft, a first end of the movable arm 27 is connected to an overhanging end of a piston rod of the holding jack 25, and a second end of the movable arm 27 is provided with the roller. The piston rods of the holding jack 25 can extend outwards from the end parts of the fixed back frame to two sides respectively, so that the movable arm 27 is driven to rotate around the fixed shaft. When the piston rod of the holding jack 25 is in an overhanging state, the first end of the movable arm is pushed outwards, and the second end of the movable arm is pressed inwards (i.e. the pile face of the steel pipe pile), so that the steel pipe pile is tightly held. When the piston rod of the holding jack 25 is contracted inwards, the first end of the movable arm is close to the fixed back frame 28 inwards, the second end of the movable arm is extended outwards (far away from the steel pipe pile surface) to be in an open state, and the steel pipe pile can translate into or out of the holding hoop at the moment, so that the opening and closing of the movable arm are controlled through the expansion and contraction of the holding jack 25. The roller 26 can roll around the surface of the steel pipe pile, and the position of the steel pipe pile is adjusted through the telescopic adjustment of the jack.
In order to ensure the horizontal precision of a steel bearing platform, the invention designs a steel bearing platform supporting and leveling system of an offshore wind generating set foundation, which comprises a plurality of sets of leveling pile clamps 19, wherein each steel bearing platform pile leg 5 is supported on a steel pipe pile 1 through three sets of leveling pile clamps. As shown in fig. 9, each set of leveling pile clamps 19 comprises a radial jack 15, an axial jack 14 and a fastener 36, and the three sets of leveling pile clamps are uniformly distributed along the circumferential direction of the steel pipe pile. The fastener 36 is reversely buckled at the top end of the steel pipe pile 1 and is fixed on the pipe wall of the steel pipe pile 1 through the leveling pile clamping device locking bolt 16, the fastener 36 extends upwards to form a supporting vertical plate, the radial jack 15 is fixed on the supporting vertical plate, and the piston rod of the radial jack is pressed on the outer wall of the pile leg 5 of the steel bearing platform. The top of the supporting vertical plate is provided with a supporting transverse plate, the axial jack 14 is arranged on the supporting transverse plate, and the piston rod of the axial jack is supported at the bottom of the steel bracket 13. Because there is certain gap between steel cushion cap spud leg 5 outer wall and the steel-pipe pile 1 inner wall, there is certain difference in height also in steel bracket 13 and steel-pipe pile 1 top, consequently can adjust steel cushion cap spud leg 5 and steel-pipe pile 1's relative position through axial jack 14 and radial jack 15, the adjustment of the vertical and horizontal direction of a plurality of steel cushion cap spud legs just can adjust the level of whole steel cushion cap, and guarantees that the spud leg is located the steel-pipe pile center. As shown in fig. 10, each set of radial jack 15 and axial jack 14 of the leveling pile clamp has a circuit connected to a jack sub-hub 30, and the circuit of the jack sub-hub 30 of each steel deck leg is connected to a jack sub-hub 31 and connected to a microprocessor 32.
The supporting and leveling system further comprises two inclination sensors 18 arranged on the flange surface of the steel bearing platform, wherein the two inclination sensors 18 are respectively arranged on two positions which are mutually radial and perpendicular on the flange surface and are electrically connected to a microprocessor 32, and the microprocessor is electrically connected with a display circuit 33, an alarm circuit 34 and a power circuit 35. The tilt sensor 18 monitors the levelness of the steel table and feeds back in real time. When the levelness of the steel bearing platform 2 greatly exceeds the normal range, the alarm circuit reminds constructors that the constructors need to check and cooperate with hoisting equipment to carry out advanced manual rough leveling at the moment, so that the steel bearing platform is in the adjustable range of the supporting and leveling system. When the levelness of the steel bearing platform 2 reaches the adjustable range of the supporting and leveling system, but does not meet the installation requirement of the tower of the offshore wind generating set, the supporting and leveling system is started to accurately level, operation instructions are sent to the axial jack and the radial jack of each leveling pile clamp through algorithm analysis of a microprocessor, and the three leveling pile clamps 19 of each steel bearing platform pile leg are controlled to stretch and retract through the microprocessor, so that the levelness of the steel bearing platform 2 finally meets the requirement.
Of course, the number of steel pipe piles can be flexibly selected according to the needs. The number is small, and the assembly is easier. However, the pile diameter is large and the capacity requirement of pile driving equipment is high to meet the stress requirement. Otherwise, the diameter of the pile is small.
The annular basin-shaped rubber sealing ring 37 is arranged at the bottom of the pile leg 5 of the steel bearing platform, so that when the pile leg is inserted into the steel pipe pile, the outer wall of the pile leg and the inner wall of the steel pipe pile form a closed state. The steel pipe pile 1 is provided with 3 grouting holes at the slightly upward position of the annular basin-shaped rubber sealing ring of the pile leg of the steel bearing platform, and the grouting holes are uniformly distributed on the horizontal circumference of the steel pipe pile. The grouting thickness and length of the connection between the steel pipe pile 1 and the pile leg 5 of the steel bearing platform are determined through the design calculation of grouting connectors.
The construction method and the steps of the invention are as follows:
1. and (3) performing truss support pile driving: and a truss support pile is applied to the center of the steel bearing platform, and the truss support pile is a steel pipe pile with the diameter of 8-15 m in order to ensure the stability of the positioning truss. And selecting a vibrating hammer with proper power to perform pile sinking of the truss support pile according to geological conditions of a construction site.
2. And (3) positioning truss installation: the positioning truss is processed in an onshore prefabrication factory, the barge is integrally transported to a construction site, a double-layer steel sleeve in the center of the positioning truss is inserted into a truss support pile after the positioning truss is lifted by an onshore lifting platform, the double-layer steel sleeve is locked and fixed with the truss support pile, and the positioning truss is installed.
3. And (3) positioning the steel pipe pile: the steel pipe pile is manufactured in an onshore steel structure processing plant, and the barge is transported to a construction site. The movable arms of the upper pile anchor ear and the lower pile anchor ear are opened, the lifting rope of the water lifting platform is hung and buckled at the top lifting point of the steel pipe pile, the lifting arm support is moved after the steel pipe pile is erected, the steel pipe pile enters the positioning die carrier tap pile anchor ear, and the pile anchor ears of the upper pile anchor ear and the lower pile anchor ear are folded. And (3) adjusting the position of the steel pipe pile through the position adjustment of the roller jack, measuring the position, and releasing the steel pipe pile after confirming that the position is within the allowable error range, so as to unlock the sling.
4. And (3) steel pipe pile construction: and the hydraulic hammer is lifted to the top of the steel pipe pile by the lifting platform sling on water, the position of the steel pipe pile is measured again, after the condition that the hydraulic hammer meets the requirement is confirmed, the hydraulic hammer is started to perform driving, the position of the steel pipe pile is checked synchronously, and when the hydraulic hammer does not meet the requirement, the position of the steel pipe pile is adjusted through the roller jack. And continuously driving the steel pipe pile until the top elevation meets the requirement. And stopping the hydraulic hammer and hanging off the top of the steel pipe pile, and sequentially applying other two steel pipe piles.
5. Dismantling a positioning die carrier: firstly, the pile anchor ear is opened, the locking bolt connection of the double-layer steel sleeve and the truss support pile is released, and the positioning truss is lifted by adopting an overhead lifting platform and then is placed on a transport barge. Selecting a vibrating hammer with proper power, hanging on a sling of a water lifting platform, shifting to a truss support pile, clamping, starting the vibrating hammer and a winch, and pulling the truss support pile upwards until all the truss support pile is pulled out and is horizontally placed on a transport barge.
6. And (3) mounting a steel bearing platform: the steel pile cap is manufactured in an onshore steel structure processing plant, the barge is transported to a construction site, an overhead hoisting platform is used for hoisting and installing, three pile legs of the steel pile cap are enabled to slide into three steel pipe piles which are applied in advance, three leveling pile clamping devices are uniformly arranged at positions of the tops of the steel pipe piles, corresponding to the steel corbels of the pile legs of the steel pile cap, and the weight of the steel pile cap is supported by the leveling pile clamping devices.
7. Leveling a steel bearing platform: and each leveling pile clamping device is provided with a radial jack and an axial jack, 2 inclination sensors are arranged on the flange surface at the top of the steel bearing platform, and the posture of the steel bearing platform is displayed to constructors through a display circuit after the data are processed by a microprocessor. And the microprocessor calculates and analyzes according to the posture of the steel bearing platform, and then adjusts the elevation and the position of the pile leg of the steel bearing platform by controlling the 18 jacks on the nine sets of leveling pile clamps on the three steel pipe piles, so as to adjust the levelness of the flange plate of the steel bearing platform. And enabling the pile leg axis of the steel bearing platform to coincide with the axis of the steel pipe pile, and simultaneously keeping the flange plate of the steel bearing platform to be in level with the requirements.
8. Grouting connection: grouting materials are poured into an annular space formed between the pile leg of the steel bearing platform and the steel pipe pile, and grouting pipes of the grouting machine are respectively connected with three grouting holes in the wall of the steel pipe pile. And starting a grouting machine to press grouting material into the annular gap until the grouting material overflows from the top of the steel pipe piles, closing the grouting holes, evacuating the equipment, and sequentially grouting other two steel pipe piles.
9. And (3) removing the support leveling system: after a certain time, the grouting material is hardened, the connection of the pile legs of the steel bearing platform and the steel pipe piles is completed, and the leveling pile clamp is removed to complete the foundation of the offshore wind turbine generator set.
Claims (5)
1. The utility model provides an offshore wind turbine generator system pile foundation cushion cap basis, includes a plurality of steel-pipe piles and a steel cushion cap, its characterized in that: the steel pile is provided with a central box body and a plurality of steel box girders extending outwards from the central box body, the top of the central box body is provided with a flange plate connected with a tower cylinder of the wind generating set, one end of each steel box girder, which is far away from the central box body, is provided with steel pile legs, the number of the steel pile legs is consistent with that of steel pipe piles and sleeved in the corresponding steel pipe piles, the steel pipe piles adopt a positioning die frame to position hammering pile sinking, the positioning die frame comprises a truss supporting pile, a positioning truss and a double-layer steel sleeve, the truss supporting pile is positioned at the center and corresponds to the center of the steel pile, the positioning truss surrounds the outside of the truss supporting pile, the double-layer steel sleeve consists of an inner steel cylinder, an outer steel cylinder and a top cover which are coaxial and have different diameters, the double-layer steel sleeve and the positioning truss are fixed together through joints, the truss supporting pile is sleeved between the inner steel cylinder and the outer steel cylinder of the double-layer steel sleeve, the positioning truss extends from the double-layer steel sleeve to the outside to form a plurality of branch parts with uniform intervals, the positions and the number of the branch parts are consistent with those of the steel pipe piles, the center of the outer end of each branch part is provided with a tap for accommodating the steel pipe piles, each tap is at least provided with an upper pile anchor ear and a lower pile anchor ear, the pile anchor ears tightly hold and fix the steel pipe piles, each pile anchor ear consists of a movable arm, a fixed back frame, a holding jack and a roller wheel, which are bilaterally symmetrical, the fixed back frame is fixed relative to the positioning truss, the middle part of the movable arm is hinged with the fixed back frame, the first end of the movable arm is connected with the extending end of a piston rod of the holding jack, the second end of the movable arm is provided with the roller wheel capable of rolling along the pile body of the steel pipe piles, the piston rod of the holding jack extends outwards or contracts inwards from the end of the fixed back frame respectively, and when the piston rod of the holding jack is in an extending state, the second end of the movable arm is used for pressing the steel pipe pile inwards; when the piston rod of the holding jack contracts inwards, the second end of the movable arm extends outwards and is far away from the steel pipe pile;
the part that steel pile cap spud leg and steel pile are connected is located above the water line, fills grouting material in the annular clearance of steel pile and steel pile cap spud leg junction position with steel pile cap spud leg and links steel pile and steel pile cap spud leg to form a whole, and every steel pile cap spud leg outwards extends the steel corbel that is located the steel pile top from the outer wall, offshore wind turbine generator system pile cap foundation adopts steel pile cap support leveling system to carry out steel pile cap leveling, steel pile cap support leveling system includes many sets of leveling pile clamps, and every steel pile cap spud leg is supported on the steel pile through three sets of leveling pile clamps, and every set of leveling pile clamps includes a radial jack, an axial jack and a fastener, and three sets of leveling pile clamps are along steel pile circumference equipartition, and the fastener is buckled on steel pile top and is fixed in on the steel pile pipe wall through the locking bolt, and the fastener upwards extends to form the support riser, and radial jack is fixed in the support riser, and radial jack presses in steel pile cap spud leg outer wall, and the support riser top is equipped with the support diaphragm, and the axial jack is located on the support diaphragm, and the axial jack piston jack is connected to microprocessor bottom the radial jack and the equal floor of every jack.
2. The offshore wind turbine foundation pile cap foundation of claim 1, wherein: the internal diameter of the outer steel cylinder of double-deck steel sleeve is greater than the external diameter of truss support stake 2~5cm, and the external diameter of steel pipe is less than the internal diameter of truss support stake 2~5cm in the double-deck steel sleeve, and outer steel cylinder lower part is equipped with a plurality of locking bolts that run through the section of thick bamboo wall with truss support stake fixed in the double-deck steel sleeve.
3. The offshore wind turbine foundation pile cap foundation of claim 1, wherein: the steel bearing platform supporting and leveling system further comprises two inclination sensors which are arranged on the flange surface of the steel bearing platform and connected to the microprocessor, and the two inclination sensors are respectively arranged at two positions which are mutually radial and perpendicular on the flange surface.
4. The offshore wind turbine foundation pile cap foundation of claim 1, wherein: the bottom of the pile leg of the steel bearing platform is provided with an annular basin-shaped rubber sealing ring so that the outer wall of the pile leg and the inner wall of the steel pipe pile form a closed state.
5. A method of constructing a pile cap foundation of an offshore wind turbine generator set according to any one of claims 1 to 4, comprising the steps of:
(1) And (3) performing truss support pile driving: a truss support pile is applied to the center of the steel bearing platform;
(2) And (3) positioning truss installation: prefabricating the positioning truss on the shore, transporting the whole barge to a construction site, hoisting by a water hoisting platform, inserting a double-layer steel sleeve in the center of the positioning truss into a truss support pile, locking and fixing the double-layer steel sleeve and the truss support pile, and finishing the installation of the positioning truss;
(3) And (3) positioning the steel pipe pile: prefabricating the steel pipe pile on the shore, transporting a barge to a construction site, opening an upper pile anchor ear and a lower pile anchor ear, hanging a sling of a water hoisting platform to buckle a hanging point at the top of the steel pipe pile, moving the hoisting arm support after the steel pipe pile is erected to enable the steel pipe pile to enter the anchor ear of the positioning truss portal pile, folding the upper pile anchor ear and the lower pile anchor ear, lowering the steel pipe pile after confirming the position, and unlocking the sling;
(4) And (3) performing steel pipe pile driving: lifting the hydraulic hammer to the top of the steel pipe pile by using a lifting platform sling on water, measuring the position of the steel pipe pile again, starting the hydraulic hammer to perform driving after confirming that the hydraulic hammer meets the requirements, checking the position of the steel pipe pile synchronously, adjusting the position of the steel pipe pile by using a pile anchor ear when the hydraulic hammer does not meet the requirements, continuously performing driving of the steel pipe pile until the top elevation meets the requirements, stopping the hydraulic hammer and lifting away from the top of the steel pipe pile, and sequentially performing driving of other two steel pipe piles;
(5) Dismantling a positioning die carrier: firstly, opening a pile hoop, releasing the locking bolt connection between the double-layer steel sleeve and the truss support pile, lifting the positioning truss by adopting an overhead lifting platform, then placing the positioning truss on a transport barge, hanging a vibrating hammer on a sling hook of the overhead lifting platform, shifting to the truss support pile, clamping, starting the vibrating hammer and a winch, and pulling the truss support pile upwards until the truss support pile is pulled out completely and is horizontally placed on the transport barge;
(6) And (3) mounting a steel bearing platform: the steel pile cap is manufactured in an onshore steel structure processing plant, the barge is transported to a construction site, a water hoisting platform is used for hoisting and installing, three pile legs of the steel pile cap are all slid into three steel pipe piles which are applied in advance, three leveling pile clamps are uniformly arranged at the position of each steel pipe pile top corresponding to the steel corbel of the pile leg of the steel pile cap, and the weight of the steel pile cap is supported by the leveling pile clamps;
(7) Leveling the steel bearing platform: each leveling pile clamping device is provided with a radial jack and an axial jack, 2 inclination sensors are arranged on the flange surface at the top of the steel pile cap, the data display the posture of the steel pile cap to constructors through a display circuit, and a microprocessor adjusts the elevation and the position of pile legs of the steel pile cap by controlling the 18 jacks on nine sets of leveling pile clamping devices on three steel pipe piles, so as to adjust the levelness of the flange plate of the steel pile cap, ensure that the axes of the pile legs of the steel pile cap are coincident with the axes of the steel pipe piles, and simultaneously keep the level of the flange plate of the steel pile cap consistent with the requirements;
(8) Grouting connection: grouting materials are filled in an annular gap formed between the pile leg of the steel bearing platform and the steel pipe pile, grouting pipes of a grouting machine are respectively connected with three grouting holes on the wall of the steel pipe pile, the grouting machine is started to press the grouting materials into the annular gap until the grouting materials overflow from the top of the steel pipe pile, the grouting holes are closed, equipment is evacuated, and other two steel pipe piles are sequentially poured;
(9) Dismantling a steel bearing platform supporting and leveling system: after the grouting material is hardened, the connection of the pile legs of the steel bearing platform and the steel pipe piles is completed, and the steel bearing platform supporting and leveling system is dismantled to complete the pile foundation bearing platform foundation of the offshore wind turbine generator system.
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| CN109972621B (en) * | 2019-04-22 | 2024-03-26 | 中建三局基础设施建设投资有限公司 | Pile pulling device for steel pipe pile in small-clearance shallow water area and construction method of pile pulling device |
| CN110805039A (en) * | 2019-11-15 | 2020-02-18 | 中天科技集团海洋工程有限公司 | Floating pile stabilizing platform |
| CN113404049A (en) * | 2021-08-03 | 2021-09-17 | 中国港湾工程有限责任公司 | Offshore platform pile foundation construction method |
| CN114577182A (en) * | 2022-01-18 | 2022-06-03 | 广东华蕴海上风电科技有限公司 | Movable synthesizes marine environment observation system |
| CN114703887A (en) * | 2022-04-29 | 2022-07-05 | 中国十九冶集团有限公司 | Construction method of high-pile bearing platform tower crane foundation |
| CN116732961B (en) * | 2023-08-14 | 2023-10-31 | 浙江华东岩土勘察设计研究院有限公司 | Positioning system of offshore jack-up platform |
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