WO2022127466A1 - Novel offshore wind turbine foundation suitable for shallow covering layer and construction method therefor - Google Patents

Novel offshore wind turbine foundation suitable for shallow covering layer and construction method therefor Download PDF

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Publication number
WO2022127466A1
WO2022127466A1 PCT/CN2021/130649 CN2021130649W WO2022127466A1 WO 2022127466 A1 WO2022127466 A1 WO 2022127466A1 CN 2021130649 W CN2021130649 W CN 2021130649W WO 2022127466 A1 WO2022127466 A1 WO 2022127466A1
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Prior art keywords
pile
screw
offshore wind
wind power
gravity
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PCT/CN2021/130649
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French (fr)
Chinese (zh)
Inventor
罗仑博
张炜
闫俊义
徐海滨
牛玉龙
代加林
王卫
张泽超
于光明
Original Assignee
中国长江三峡集团有限公司
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Priority claimed from CN202023051433.XU external-priority patent/CN215441994U/en
Priority claimed from CN202011502553.9A external-priority patent/CN112627222B/en
Application filed by 中国长江三峡集团有限公司 filed Critical 中国长江三峡集团有限公司
Priority to DE112021000948.6T priority Critical patent/DE112021000948T5/en
Priority to CA3177328A priority patent/CA3177328C/en
Publication of WO2022127466A1 publication Critical patent/WO2022127466A1/en

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    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D27/00Foundations as substructures
    • E02D27/32Foundations for special purposes
    • E02D27/42Foundations for poles, masts or chimneys
    • E02D27/425Foundations for poles, masts or chimneys specially adapted for wind motors masts
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D15/00Handling building or like materials for hydraulic engineering or foundations
    • E02D15/08Sinking workpieces into water or soil inasmuch as not provided for elsewhere
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D27/00Foundations as substructures
    • E02D27/32Foundations for special purposes
    • E02D27/50Anchored foundations
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D27/00Foundations as substructures
    • E02D27/32Foundations for special purposes
    • E02D27/52Submerged foundations, i.e. submerged in open water
    • E02D27/525Submerged foundations, i.e. submerged in open water using elements penetrating the underwater ground
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D5/00Bulkheads, piles, or other structural elements specially adapted to foundation engineering
    • E02D5/22Piles
    • E02D5/56Screw piles
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D7/00Methods or apparatus for placing sheet pile bulkheads, piles, mouldpipes, or other moulds
    • E02D7/22Placing by screwing down
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/70Wind energy
    • Y02E10/72Wind turbines with rotation axis in wind direction
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/70Wind energy
    • Y02E10/727Offshore wind turbines

Definitions

  • Offshore wind turbines bear the coupling effect of wind, waves, currents and other environmental loads in the whole life cycle, and the offshore wind power foundation is required to have good composite bearing performance, including horizontal bearing capacity, bending moment bearing capacity, vertical bearing capacity and uplift Carrying capacity.
  • the cost of offshore wind power infrastructure construction accounts for about 30% of the total cost of offshore wind farm construction in deep waters.
  • the subsidy for the on-grid tariff of offshore wind power will be cancelled by the end of 2021. Therefore, cost reduction and efficiency increase have become the top priority of the development of the offshore wind power industry, and a new basic type of offshore wind power needs to be developed urgently.
  • the geological conditions of various sea areas in my country are quite different.
  • the overburden in the sea areas of Guangdong and Fujian is relatively shallow.
  • the bearing capacity of offshore wind power foundations is also required to increase, resulting in a corresponding increase in the pile diameter of the foundation, and even rock-socketed construction.
  • the single-pile foundation accounts for more than 80% of the offshore wind power construction, which is regarded as the most mature foundation type and has the advantages of simple production and short construction period.
  • large-scale drilling equipment needs to be drilled in the single-pile rock-socketed construction.
  • the technical process is more complicated, the technical difficulty is greater, the risk of hole collapse is high, the construction progress control is difficult, and the construction More expensive.
  • the shallow overburden rock-socketed pile needs to be deeply embedded in order to improve the enough resistance to horizontal load, and the fixed end of the single pile is deeper, the bending moment of the single pile is larger, and the required strength of the single pile is higher. higher.
  • gravity-based shallow foundations are widely used, which have the characteristics of good economy and wide application range, and have excellent vertical ultimate bearing capacity, which is a foundation form with good application prospects. .
  • its anti-overturning, anti-slipping, especially anti-pulling performance is weak, and there is a certain degree of engineering risk in applying it to offshore wind power foundations.
  • the invention aims to solve the problem of insufficient types of offshore wind power foundations in the current shallow covering layer, solve the difficult problems of high construction difficulty, high cost, long construction period, etc., such as rock-socketed construction of a single pile foundation, and provides an offshore wind power suitable for shallow covering layers.
  • a new foundation for wind power and its construction method, the present invention mainly increases the stiffness of the soil around the pile by increasing the gravity disk, improves the anti-overturning ability and the anti-scour ability of the foundation, and improves the anti-pulling bearing capacity and level of the foundation through the screw pile and the gravity disk.
  • a new type of offshore wind power foundation suitable for shallow covering layer which includes a single pile, on which a gravity disk is fixedly installed, and the gravity disk is A plurality of screw piles are uniformly distributed and fixedly installed on the periphery; the adjacent screw piles are fixedly connected to form an integral structure.
  • the gravity disk includes a gravity disk foundation, and a center ring is arranged at the center of the gravity disk base; the single pile passes through the center ring, and the two form a contact fit; the gravity disk foundation is centered on the center ring A plurality of connecting rods are evenly distributed and fixed, the other end of the connecting rods is fixed with a screw pile mounting seat for installing the screw pile, and a plurality of pins are evenly distributed on the inner side wall of the screw pile mounting seat.
  • the gravity disk foundation adopts a concrete structure or a filler structure; the concrete structure adopts an integral prefabricated structure on the shore; the filler structure adopts a cemented rockfill body, and the cemented rockfill body is filled with loose-grained rockfill, And through the underwater grouting technology, the cemented rockfill body and the structured cemented rockfill body with high water permeability are formed.
  • the spiral pile includes a steel pipe pile, and a spiral pile blade is arranged on the outer wall of the steel pipe pile and along its length direction, the bottom end of the steel pipe pile is provided with a spiral pile head, and the top end of the steel pipe pile is provided with a force for and gravity.
  • the bolt of the plate is matched with the bolt hole of the screw pile.
  • the top of the screw pile is provided with a screw pile installation and connection part for quick disassembly and connection with the pile body sinking construction equipment.
  • the screw pile installation and connection part includes a screw pile installation key fixed on the top of the steel pipe pile. The screw pile installation keyway at the bottom end of the transmission rod of the submerged construction equipment is matched and connected, and the torque is transmitted.
  • the helical pile blades are in annular arc shape, and the inclination angle, quantity, interval and diameter of the blades can be selected and used according to the geological conditions and the load of the fan unit.
  • the structure type of the gravity disk and the array arrangement of the screw piles can be triangular, square, hexagonal or circular; the number and array arrangement of the screw piles can be selected and adjusted according to the geological conditions and the load of the fan unit. use.
  • the cross section of the gravity disc foundation adopts a rectangle or a trapezoid.
  • the construction method of the new foundation for offshore wind power with shallow cover including the following steps:
  • Step 1 Use the offshore jack-up platform or the offshore wind power construction ship to sink all the screw piles to the design pile position one by one, connect the screw piles to the top of the screw piles through the construction ship connecting rod and screw pile installation connecting parts, and screw the screw piles into In the covering layer, after reaching the design depth, reversely twist the connecting rod to realize the separation of the screw pile installation and connecting parts;
  • Step 2 Lift and sink the gravity disk, make all the screw pile mounts pass through all the screw piles, and use the gravity disk's own weight or external pressure to make the bolts in the screw pile mounts and the screw piles bolt.
  • the holes are butted; then, the hydraulic concrete is poured into the screw pile mounting seat through the underwater grouting equipment to realize the rigid connection between the screw pile and the gravity disk;
  • Step 3 The single pile is hoisted and sunk through the central ring, partially penetrated below the mud surface by its own weight or external pressure, and then the single pile is driven to the design depth by the pile driving equipment, that is, the single pile When the collar is in contact with the center ring of the gravity disk, the hydraulic concrete is poured into the center ring through the underwater grouting equipment.
  • FIG. 1 is a front view of a new type of foundation for offshore wind power according to the present invention, which is suitable for shallow cover.
  • FIG. 2 is a top view of the new foundation for offshore wind power in FIG. 1 .
  • FIG. 3 is a front view of a single pile of the new foundation for offshore wind power in FIG. 1 .
  • FIG. 9 is a schematic diagram of the screw pile installation and connection components in FIG. 8 .
  • 10 to 11 are cross-sectional views of modified examples of the screw pile according to the embodiment of the present invention.
  • FIG. 12 is a cross-sectional view of a modified example of the gravity plate according to the embodiment of the present invention.
  • FIG. 13 to 15 are top views of modified examples of the gravity plate according to the embodiment of the present invention.
  • the gravity disk foundation 3-4 adopts a concrete structure or a filler structure; the concrete structure adopts the form of an integral prefabricated structure on the shore; the filler structure adopts a cemented rockfill body, and the cemented rockfill body is a filling structure.
  • the concrete structure adopts the form of an integral prefabricated structure on the shore;
  • the filler structure adopts a cemented rockfill body, and the cemented rockfill body is a filling structure.
  • the screw pile 2 includes a steel pipe pile 2-1, a screw pile blade 2-2 is arranged on the outer wall of the steel pipe pile 2-1 and along its length direction, and the bottom end of the steel pipe pile 2-1 is arranged There is a screw pile head 2-3, and the top end of the steel pipe pile 2-1 is provided with a screw pile bolt hole 2-4 for matching with the bolt 3-5 of the gravity plate 3.
  • the above-mentioned screw piles 2 are drilled below the covering layer, thereby improving the bearing capacity of the gravity disk 3 .
  • spiral pile blades 2-2 are in the shape of an annular arc, and the inclination angle, number, interval and diameter of the blades can be selected and used according to the geological conditions and the load of the fan unit. The above structure ensures that it can be drilled smoothly.
  • the construction method of the new foundation for offshore wind power with shallow cover including the following steps:
  • Step 1 Use the offshore jack-up platform or the offshore wind power construction ship to sink all the screw piles 2 to the design pile position one by one, and connect the screw piles 2 to the top of the screw piles 2 through the construction ship connecting rod and the screw pile installation connection parts 2-5. Screw the screw pile 2 into the covering layer, and after reaching the design depth, reversely twist the connecting rod to realize the separation of the screw pile installation and connecting parts 2-5;
  • Step 2 Lift and sink the gravity plate 3, make all the screw pile mounts 3-3 pass through all the screw piles 2, and use the self-weight of the gravity plate 3 or the action of external pressure to make the screw pile mounts 3
  • the bolt 3-5 in -3 is docked with the bolt hole 2-4 of the screw pile; then, the hydraulic concrete is poured into the screw pile mounting seat 3-3 through the underwater grouting equipment to realize the rigid connection between the screw pile 2 and the gravity plate 3 ;
  • Step 3 Lift and sink the monopile 1 and pass through the central ring 3-1, partially penetrate below the mud surface by self-weight or external pressure, and then drive the monopile 1 into the design through the pile driving equipment. Depth, that is, when the single pile collar 1-1 is in contact with the center ring of the gravity disk, then pour hydraulic concrete into the center ring 3-1 through the underwater grouting equipment, and after the concrete has sufficient strength, make the single pile, The screw pile and the gravity disk form an integral load.
  • a plurality of screw piles with different lengths and different numbers of blades are formed into a composite body through connecting rods and a central single pile foundation, the central single pile is driven into the foundation, and the central single pile and the central cylinder are connected by grouting to form a whole;
  • the connecting piece and the monopile foundation are anchored by grouting;
  • rockfill and gel medium are added to the connection groove to form a whole with the central monopile and the screw pile; through the implementation, it can not only adapt to larger water depths, but also avoid single piles.
  • screw piles with different lengths and blades can increase the anti-overturning and pull-out bearing capacity.
  • the gel stone moor in the connecting groove is both water permeable and anti-scour. At the same time, it also has the advantages of low investment cost and fast construction speed.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Paleontology (AREA)
  • Civil Engineering (AREA)
  • Piles And Underground Anchors (AREA)
  • Foundations (AREA)
  • Wind Motors (AREA)

Abstract

A novel offshore wind turbine foundation suitable for a shallow covering layer and a construction method therefor, the offshore wind turbine foundation comprising a single pile (1). A gravity disc (3) is fixedly mounted on the single pile (1); a plurality of helical piles (2) are evenly distributed on the periphery of the gravity disc (3); and adjacent helical piles (2) are fixedly connected to each other to form an integral structure. The uplift-resisting bearing capacity and horizontal bearing capacity of the foundation are improved by means of the helical piles (2) and the gravity disc (3); the horizontal displacement of the pile body is reduced; the bending moment of the pile body is reduced; and the combination and rigid connection of the helical piles (2), the gravity disc (3), and the single pile (1) improve various mechanical properties of the whole foundation, such that the construction requirement for safe and stable operation of an offshore wind turbine can be met without needing to inserting the single pile (1) into the bedrock.

Description

一种适用于浅覆盖层的海上风电新型基础及其施工方法A new type of offshore wind power foundation suitable for shallow cover and its construction method 技术领域technical field
本发明涉及海上风电技术领域,具体涉及一种适用于浅覆盖层的海上风电新型基础及其施工方法。The invention relates to the technical field of offshore wind power, in particular to a new offshore wind power foundation suitable for shallow covering layers and a construction method thereof.
背景技术Background technique
海上风电机组在全生命周期内承受风、浪、流等环境荷载的耦合作用,要求海上风电基础需要具有良好的复合承载性能,包括水平承载能力、弯矩承载能力、竖向承载能力以及上拔承载能力。目前,海上风电基础建设费用在水深较深海域占海上风电场建设总成本约30%,随着国家新能源补贴政策的变更,2021年底将取消海上风电上网电价的补贴。因此,降本增效成为了海上风电行业发展的重中之重,一种海上风电新型基础型式亟待开发。Offshore wind turbines bear the coupling effect of wind, waves, currents and other environmental loads in the whole life cycle, and the offshore wind power foundation is required to have good composite bearing performance, including horizontal bearing capacity, bending moment bearing capacity, vertical bearing capacity and uplift Carrying capacity. At present, the cost of offshore wind power infrastructure construction accounts for about 30% of the total cost of offshore wind farm construction in deep waters. With the change of the national new energy subsidy policy, the subsidy for the on-grid tariff of offshore wind power will be cancelled by the end of 2021. Therefore, cost reduction and efficiency increase have become the top priority of the development of the offshore wind power industry, and a new basic type of offshore wind power needs to be developed urgently.
我国各海域的地质条件差异性较大,如广东、福建海域的覆盖层较浅。为满足不断增长的风机机组容量,要求海上风电基础承载力也随之增加,导致基础的桩径需要相应增大,甚至需要进行嵌岩施工。当前,海上风电建设中单桩基础占比超过80%,被看作是最成熟的基础型式,具有制作简单、施工周期短等优点。然而,单桩嵌岩施工中需要进行大型钻探设备钻孔,相比于覆盖层中的打桩施工,技术工序更为复杂,技术难度更大,塌孔风险高,施工进度控制难度大,且施工费用更贵。同时,浅覆盖层嵌岩桩由于要提高足够的抗水平荷载的能力,需要的嵌入深度较深,而且单桩的固定端较深,单桩的承受的弯矩更大,需要的单桩强度更高。此外,对于浅覆盖层海域,重力式浅基础被广泛应用,其具有经济性好、适用范围广的特点,且其存在十分出色的竖向极限承载能力,是一种具有良好应用前景的基础形式。但相较于其竖向承载性能,其抗倾覆、抗滑移尤其是抗拔能薄弱,将其应用于海上风电基础存在一定程度的工程风险。The geological conditions of various sea areas in my country are quite different. For example, the overburden in the sea areas of Guangdong and Fujian is relatively shallow. In order to meet the ever-increasing capacity of wind turbine units, the bearing capacity of offshore wind power foundations is also required to increase, resulting in a corresponding increase in the pile diameter of the foundation, and even rock-socketed construction. At present, the single-pile foundation accounts for more than 80% of the offshore wind power construction, which is regarded as the most mature foundation type and has the advantages of simple production and short construction period. However, large-scale drilling equipment needs to be drilled in the single-pile rock-socketed construction. Compared with the piling construction in the overburden, the technical process is more complicated, the technical difficulty is greater, the risk of hole collapse is high, the construction progress control is difficult, and the construction More expensive. At the same time, the shallow overburden rock-socketed pile needs to be deeply embedded in order to improve the enough resistance to horizontal load, and the fixed end of the single pile is deeper, the bending moment of the single pile is larger, and the required strength of the single pile is higher. higher. In addition, for shallow overburden sea areas, gravity-based shallow foundations are widely used, which have the characteristics of good economy and wide application range, and have excellent vertical ultimate bearing capacity, which is a foundation form with good application prospects. . However, compared with its vertical bearing performance, its anti-overturning, anti-slipping, especially anti-pulling performance is weak, and there is a certain degree of engineering risk in applying it to offshore wind power foundations.
基于现有海上风电基础的不足,迫切需要提出一种新型海上风机基础,使之可以适用于浅覆盖层,通过新型基础使得单桩无需深嵌入基岩中,在满足竖向承载力的基础上,更能满足水平与弯矩承载能力,降低施工难度和成本,提高施工速度,同时提供一定地防冲刷能力,并保证风机的安全稳定运行。Based on the shortcomings of the existing offshore wind power foundation, it is urgent to propose a new type of offshore wind turbine foundation, which can be applied to shallow overburden layers. Through the new foundation, the single pile does not need to be deeply embedded in the bedrock, and on the basis of satisfying the vertical bearing capacity , which can better meet the horizontal and bending moment bearing capacity, reduce the difficulty and cost of construction, improve the construction speed, and at the same time provide a certain anti-scour ability, and ensure the safe and stable operation of the fan.
发明内容SUMMARY OF THE INVENTION
本发明旨在解决当前浅覆盖层海上风电基础型式不足的问题,解决单桩基础嵌岩施工等高施工难度、高成本、施工期长等难点问题,提供了一种适用于浅覆盖层的海上风电新型基础及其施工方法,本发明主要通过增加重力盘继而增加桩周土体的刚度,提升基础的抗倾覆能力和防冲刷能力,通过螺旋桩与重力盘提高基础的抗拔承载能力与水平承载能力,降低桩身水平位移,减小桩身弯矩;通过将螺旋桩、重力盘、单桩拼接,刚性连接,提高整个基础的各项力学指标;从而实现在单桩无需嵌入基岩情况下,满足海上风电安全稳定运行的工程需要。The invention aims to solve the problem of insufficient types of offshore wind power foundations in the current shallow covering layer, solve the difficult problems of high construction difficulty, high cost, long construction period, etc., such as rock-socketed construction of a single pile foundation, and provides an offshore wind power suitable for shallow covering layers. A new foundation for wind power and its construction method, the present invention mainly increases the stiffness of the soil around the pile by increasing the gravity disk, improves the anti-overturning ability and the anti-scour ability of the foundation, and improves the anti-pulling bearing capacity and level of the foundation through the screw pile and the gravity disk. Bearing capacity, reduce the horizontal displacement of the pile body, and reduce the bending moment of the pile body; by splicing and rigidly connecting the screw pile, the gravity plate and the single pile, the mechanical indexes of the entire foundation are improved; thus, the single pile does not need to be embedded in the bedrock. to meet the engineering needs of the safe and stable operation of offshore wind power.
为了实现上述的技术特征,本发明的目的是这样实现的:一种适用于浅覆盖层的海上风电新型基础,它包括单桩,所述单桩上固定安装有重力盘,所述重力盘的外围均布固 定安装有多根螺旋桩;相邻的螺旋桩之间固定相连并构成整体结构。In order to realize the above-mentioned technical features, the purpose of the present invention is achieved as follows: a new type of offshore wind power foundation suitable for shallow covering layer, which includes a single pile, on which a gravity disk is fixedly installed, and the gravity disk is A plurality of screw piles are uniformly distributed and fixedly installed on the periphery; the adjacent screw piles are fixedly connected to form an integral structure.
所述单桩采用大直径钢管桩;在单桩上设置有用于固定重力盘的套环,并使得两者之间构成刚性连接。The single pile adopts a large-diameter steel pipe pile; a collar for fixing the gravity disk is arranged on the single pile, and a rigid connection is formed between the two.
所述重力盘包括重力盘基础,在重力盘本基础的中心部位设置有中心环;所述单桩穿过中心环,且两者构成接触配合;所述重力盘基础上并以中心环为中心均布固定有多根连接杆件,连接杆件的另一端固定有用于安装螺旋桩的螺旋桩安装座,所述螺旋桩安装座的内侧壁上均布设置有多个插销。The gravity disk includes a gravity disk foundation, and a center ring is arranged at the center of the gravity disk base; the single pile passes through the center ring, and the two form a contact fit; the gravity disk foundation is centered on the center ring A plurality of connecting rods are evenly distributed and fixed, the other end of the connecting rods is fixed with a screw pile mounting seat for installing the screw pile, and a plurality of pins are evenly distributed on the inner side wall of the screw pile mounting seat.
所述重力盘基础采用混凝土结构或填充物结构;所述混凝土结构采用在岸上整体预制结构形式;所述填充物结构采用胶结堆石体,所述胶结堆石体为填筑散粒堆石料,并通过水下灌浆技术形成具有高透水性的胶结堆石体、结构化胶结堆石体。The gravity disk foundation adopts a concrete structure or a filler structure; the concrete structure adopts an integral prefabricated structure on the shore; the filler structure adopts a cemented rockfill body, and the cemented rockfill body is filled with loose-grained rockfill, And through the underwater grouting technology, the cemented rockfill body and the structured cemented rockfill body with high water permeability are formed.
所述螺旋桩包括钢管桩,在钢管桩的外壁上并沿其长度方向设置有螺旋桩叶片,钢管桩的底端设置有螺旋桩桩头,钢管桩的顶端设置有用于和重力盘的插销相配合的螺旋桩插销孔。The spiral pile includes a steel pipe pile, and a spiral pile blade is arranged on the outer wall of the steel pipe pile and along its length direction, the bottom end of the steel pipe pile is provided with a spiral pile head, and the top end of the steel pipe pile is provided with a force for and gravity. The bolt of the plate is matched with the bolt hole of the screw pile.
所述螺旋桩的顶部设置有用于和桩体下沉施工设备快速拆卸相连的螺旋桩安装连接部件,螺旋桩安装连接部件包括固定在钢管桩顶端的螺旋桩安装键,螺旋桩安装键与桩体下沉施工设备的传动杆底端的螺旋桩安装键槽配合相连,并传递扭矩。The top of the screw pile is provided with a screw pile installation and connection part for quick disassembly and connection with the pile body sinking construction equipment. The screw pile installation and connection part includes a screw pile installation key fixed on the top of the steel pipe pile. The screw pile installation keyway at the bottom end of the transmission rod of the submerged construction equipment is matched and connected, and the torque is transmitted.
所述螺旋桩叶片呈环状弧形,且叶片倾角、数量、间隔和直径能够根据地质条件和风机机组载荷进行选择使用。The helical pile blades are in annular arc shape, and the inclination angle, quantity, interval and diameter of the blades can be selected and used according to the geological conditions and the load of the fan unit.
所述重力盘的结构型式和螺旋桩的阵列布置方式可以为三角形、正方形、六边形或圆形;其螺旋桩的数量和阵列排布方式能够根据地质条件和风机机组载荷的不同进行选择调整使用。The structure type of the gravity disk and the array arrangement of the screw piles can be triangular, square, hexagonal or circular; the number and array arrangement of the screw piles can be selected and adjusted according to the geological conditions and the load of the fan unit. use.
所述重力盘基础的截面采用矩形或者梯形。The cross section of the gravity disc foundation adopts a rectangle or a trapezoid.
适用于浅覆盖层的海上风电新型基础的施工方法,包括以下步骤:The construction method of the new foundation for offshore wind power with shallow cover, including the following steps:
步骤一:利用海上自升式平台或海上风电施工船将所有所述螺旋桩逐一下沉至设计桩位,通过施工船舶连接杆配合螺旋桩安装连接部件与螺旋桩顶端相连,将螺旋桩旋入到覆盖层中,到达设计深度后,反向扭转连接杆实现螺旋桩安装连接部件的分离;Step 1: Use the offshore jack-up platform or the offshore wind power construction ship to sink all the screw piles to the design pile position one by one, connect the screw piles to the top of the screw piles through the construction ship connecting rod and screw pile installation connecting parts, and screw the screw piles into In the covering layer, after reaching the design depth, reversely twist the connecting rod to realize the separation of the screw pile installation and connecting parts;
步骤二:将所述重力盘吊装下沉,并使所有所述螺旋桩安装座穿过所有所述螺旋桩,利用重力盘的自重或外加压力作用使螺旋桩安装座中的插销与螺旋桩插销孔对接;然后,通过水下灌浆设备将水硬性混凝土灌注至螺旋桩安装座,实现螺旋桩与重力盘的刚性连接;Step 2: Lift and sink the gravity disk, make all the screw pile mounts pass through all the screw piles, and use the gravity disk's own weight or external pressure to make the bolts in the screw pile mounts and the screw piles bolt. The holes are butted; then, the hydraulic concrete is poured into the screw pile mounting seat through the underwater grouting equipment to realize the rigid connection between the screw pile and the gravity disk;
步骤三:将所述单桩吊装下沉并穿过中心环,通过自重或外加压力作用使其部分贯入泥面以下,然后,通过沉桩设备将单桩打入到设计深度,即单桩套环与重力盘的中心环接触时,然后,通过水下灌浆设备将水硬性混凝土灌注至中心环,待混凝土产生足够的强度后,使单桩、螺旋桩和重力盘形成整体受荷。Step 3: The single pile is hoisted and sunk through the central ring, partially penetrated below the mud surface by its own weight or external pressure, and then the single pile is driven to the design depth by the pile driving equipment, that is, the single pile When the collar is in contact with the center ring of the gravity disk, the hydraulic concrete is poured into the center ring through the underwater grouting equipment.
本发明有如下有益效果:The present invention has the following beneficial effects:
1、本发明提出了一种适用于浅覆盖层的海上风电新型基础及其施工方法,该结构形式结合了单桩、螺旋桩和重力盘,并充分运用各构件的优点,形成一个新型复合型基础,其适用于覆盖层较浅的海域,可避免单桩基础的嵌岩施工问题。1. The present invention proposes a new type of offshore wind power foundation suitable for shallow covering layer and its construction method. This structural form combines single piles, screw piles and gravity disks, and makes full use of the advantages of each component to form a new composite type. It is suitable for the sea area with shallow covering layer, which can avoid the problem of rock-socketed construction of single-pile foundation.
2、重力盘增加了桩周土体的刚度,提升了基础的抗倾覆能力和防冲刷能力,螺旋 桩与重力盘提高了基础的抗拔承载能力与水平承载能力,降低了桩身水平位移,减小了桩身弯矩,从而提高基础在长期循环荷载下以及极端工况下的复合承载能力。2. The gravity plate increases the stiffness of the soil around the pile, and improves the anti-overturning ability and anti-scour ability of the foundation. The screw pile and the gravity plate improve the anti-pulling bearing capacity and horizontal bearing capacity of the foundation, and reduce the horizontal displacement of the pile body. The bending moment of the pile body is reduced, thereby improving the composite bearing capacity of the foundation under long-term cyclic loading and extreme working conditions.
3、此外,螺旋桩安装施工灵活、安全经济。水下灌浆施工技术已较为成熟,可连接单桩、螺旋桩以及重力盘。3. In addition, the installation and construction of screw piles are flexible, safe and economical. The underwater grouting construction technology is relatively mature, which can connect single piles, screw piles and gravity disks.
4、最后堆石可采用多种材料,通过凝胶等材质可将堆石连接成透水或不透水的刚性或柔性结构。4. A variety of materials can be used for the final rockfill, and the rockfill can be connected into a rigid or flexible structure that is permeable or impermeable through materials such as gel.
附图说明Description of drawings
下面结合附图和实施例对本发明作进一步说明。The present invention will be further described below with reference to the accompanying drawings and embodiments.
图1是本发明中一种适用于浅覆盖层的海上风电新型基础的正视图。FIG. 1 is a front view of a new type of foundation for offshore wind power according to the present invention, which is suitable for shallow cover.
图2是图1中海上风电新型基础的一种俯视图。FIG. 2 is a top view of the new foundation for offshore wind power in FIG. 1 .
图3是图1中海上风电新型基础的单桩正视图。FIG. 3 is a front view of a single pile of the new foundation for offshore wind power in FIG. 1 .
图4是图3中海上风电新型基础的单桩俯视图。FIG. 4 is a top view of a single pile of the new foundation for offshore wind power in FIG. 3 .
图5是图1中海上风电新型基础的一种重力盘正视图。FIG. 5 is a front view of a gravity plate of the new foundation for offshore wind power in FIG. 1 .
图6是图5中重力盘的螺旋桩安装座俯视图。FIG. 6 is a top view of the screw pile mounting seat of the gravity disk in FIG. 5 .
图7是图1中海上风电新型基础的一种螺旋桩正视图。FIG. 7 is a front view of a screw pile of the new foundation for offshore wind power in FIG. 1 .
图8是图7中螺旋桩的安装示意图。FIG. 8 is a schematic view of the installation of the screw pile in FIG. 7 .
图9是图8中螺旋桩安装连接部件示意图。FIG. 9 is a schematic diagram of the screw pile installation and connection components in FIG. 8 .
图10至图11是根据本发明的实施例的螺旋桩的变型示例的截面图。10 to 11 are cross-sectional views of modified examples of the screw pile according to the embodiment of the present invention.
图12是根据本发明的实施例的重力盘的变型示例的截面图。12 is a cross-sectional view of a modified example of the gravity plate according to the embodiment of the present invention.
图13至图15是根据本发明的实施例的重力盘的变型示例的俯视图。13 to 15 are top views of modified examples of the gravity plate according to the embodiment of the present invention.
图中:单桩1、螺旋桩2、重力盘3;套环1-1;钢管桩2-1、螺旋桩叶片2-2、螺旋桩桩头2-3、螺旋桩插销孔2-4、螺旋桩安装连接部件2-5;螺旋桩安装键2-5-1、螺旋桩安装键槽2-5-2;中心环3-1、连接杆件3-2、螺旋桩安装座3-3、重力盘本基础3-4、插销3-5。In the figure: single pile 1, screw pile 2, gravity disk 3; collar 1-1; steel pipe pile 2-1, screw pile blade 2-2, screw pile head 2-3, screw pile bolt hole 2-4 , screw pile installation and connection parts 2-5; screw pile installation key 2-5-1, screw pile installation keyway 2-5-2; central ring 3-1, connecting rod 3-2, screw pile installation seat 3-3 , Gravity plate base 3-4, latch 3-5.
具体实施方式Detailed ways
下面结合附图对本发明的实施方式做进一步的说明。The embodiments of the present invention will be further described below with reference to the accompanying drawings.
实施例1:Example 1:
参见图1-15,一种适用于浅覆盖层的海上风电新型基础,它包括单桩1,所述单桩1上固定安装有重力盘3,所述重力盘3的外围均布固定安装有多根螺旋桩2;相邻的螺旋桩2之间固定相连并构成整体结构。通过采用上述结构的基础通过将螺旋桩、重力盘、单桩拼接,刚性连接,提高整个基础的各项力学指标。从而实现在单桩无需嵌入基岩情况下,满足海上风电安全稳定运行的工程需要。Referring to Figures 1-15, a new type of offshore wind power foundation suitable for shallow covering layers includes a single pile 1, on which a gravity plate 3 is fixedly installed, and the periphery of the gravity plate 3 is uniformly distributed and fixedly installed A plurality of screw piles 2; the adjacent screw piles 2 are fixedly connected to form an integral structure. By adopting the foundation of the above structure, the mechanical indexes of the whole foundation are improved by splicing and rigidly connecting the screw pile, the gravity plate and the single pile. In this way, the engineering needs of the safe and stable operation of offshore wind power can be met without the need for the single pile to be embedded in the bedrock.
进一步的,所述单桩1采用大直径钢管桩;在单桩1上设置有用于固定重力盘3的套环1-1,并使得两者之间构成刚性连接。通过上述的套环1-1保证了单桩1能够与重力盘3可靠的连接。Further, the single pile 1 adopts a large-diameter steel pipe pile; a collar 1-1 for fixing the gravity disk 3 is arranged on the single pile 1, and a rigid connection is formed between the two. The above-mentioned collar 1-1 ensures that the monopile 1 can be reliably connected to the gravity plate 3 .
进一步的,所述重力盘3包括重力盘基础3-4,在重力盘本基础3-4的中心部位设置有中心环3-1;所述单桩1穿过中心环3-1,且两者构成接触配合;所述重力盘基础3-4上并以中心环3-1为中心均布固定有多根连接杆件3-2,连接杆件3-2的另一端固定有用于安装螺 旋桩2的螺旋桩安装座3-3,所述螺旋桩安装座3-3的内侧壁上均布设置有多个插销3-5。通过上述的重力盘3有效的增强了单桩1的抗倾覆能力,增强了其承载力。Further, the gravity plate 3 includes a gravity plate foundation 3-4, and a center ring 3-1 is arranged at the center of the gravity plate base 3-4; the single pile 1 passes through the center ring 3-1, and the two A plurality of connecting rods 3-2 are evenly distributed and fixed on the gravity disk base 3-4 with the center ring 3-1 as the center, and the other end of the connecting rod 3-2 is fixed with a screw for installing The screw pile mounting seat 3-3 of the pile 2, the inner side wall of the screw pile mounting seat 3-3 is provided with a plurality of pins 3-5 evenly distributed. The anti-overturning ability of the single pile 1 is effectively enhanced by the above-mentioned gravity disk 3, and its bearing capacity is enhanced.
进一步的,所述重力盘基础3-4采用混凝土结构或填充物结构;所述混凝土结构采用在岸上整体预制结构形式;所述填充物结构采用胶结堆石体,所述胶结堆石体为填筑散粒堆石料,并通过水下灌浆技术形成具有高透水性的胶结堆石体、结构化胶结堆石体。通过采用上述多种不同的结构形式,增强了其适应性。Further, the gravity disk foundation 3-4 adopts a concrete structure or a filler structure; the concrete structure adopts the form of an integral prefabricated structure on the shore; the filler structure adopts a cemented rockfill body, and the cemented rockfill body is a filling structure. Build bulk rockfill, and form cemented rockfill and structured cemented rockfill with high water permeability through underwater grouting technology. By adopting the above-mentioned various structural forms, its adaptability is enhanced.
进一步的,所述螺旋桩2包括钢管桩2-1,在钢管桩2-1的外壁上并沿其长度方向设置有螺旋桩叶片2-2,钢管桩2-1的底端设置有螺旋桩桩头2-3,钢管桩2-1的顶端设置有用于和重力盘3的插销3-5相配合的螺旋桩插销孔2-4。通过上述的螺旋桩2其钻入到覆盖层以下,进而提升了重力盘3的承载能力。Further, the screw pile 2 includes a steel pipe pile 2-1, a screw pile blade 2-2 is arranged on the outer wall of the steel pipe pile 2-1 and along its length direction, and the bottom end of the steel pipe pile 2-1 is arranged There is a screw pile head 2-3, and the top end of the steel pipe pile 2-1 is provided with a screw pile bolt hole 2-4 for matching with the bolt 3-5 of the gravity plate 3. The above-mentioned screw piles 2 are drilled below the covering layer, thereby improving the bearing capacity of the gravity disk 3 .
进一步的,所述螺旋桩2的顶部设置有用于和桩体下沉施工设备快速拆卸相连的螺旋桩安装连接部件2-5,螺旋桩安装连接部件2-5包括固定在钢管桩2-1顶端的螺旋桩安装键2-5-1,螺旋桩安装键2-5-1与桩体下沉施工设备的传动杆底端的螺旋桩安装键槽2-5-2配合相连,并传递扭矩。通过上述的螺旋桩安装连接部件2-5保证了施工过程中,能够将螺旋桩2与施工设备快速相连,进而传递扭矩。Further, the top of the screw pile 2 is provided with a screw pile installation and connection part 2-5 for quick disassembly and connection with the pile body sinking construction equipment. The screw pile installation and connection part 2-5 includes a steel pipe pile 2-1 The screw pile installation key 2-5-1 at the top and the screw pile installation key 2-5-1 are connected with the screw pile installation keyway 2-5-2 at the bottom end of the transmission rod of the pile sinking construction equipment, and transmit torque. The above-mentioned screw pile installation and connection components 2-5 ensure that the screw pile 2 can be quickly connected with the construction equipment during the construction process, thereby transmitting torque.
进一步的,所述螺旋桩叶片2-2呈环状弧形,且叶片倾角、数量、间隔和直径能够根据地质条件和风机机组载荷进行选择使用。通过上述的结构保证其能够顺利的钻入。Further, the spiral pile blades 2-2 are in the shape of an annular arc, and the inclination angle, number, interval and diameter of the blades can be selected and used according to the geological conditions and the load of the fan unit. The above structure ensures that it can be drilled smoothly.
进一步的,所述重力盘3的结构型式和螺旋桩2的阵列布置方式可以为三角形、正方形、六边形或圆形;其螺旋桩2的数量和阵列排布方式能够根据地质条件和风机机组载荷的不同进行选择调整使用。Further, the structural type of the gravity disk 3 and the array arrangement of the screw piles 2 can be triangular, square, hexagonal or circular; the number and array arrangement of the screw piles 2 can be determined according to the geological conditions and the fan unit. Different loads can be selected and adjusted for use.
进一步的,所述重力盘基础3-4的截面采用矩形或者梯形。Further, the cross section of the gravity disk foundation 3-4 adopts a rectangular or trapezoidal shape.
实施例2:Example 2:
适用于浅覆盖层的海上风电新型基础的施工方法,包括以下步骤:The construction method of the new foundation for offshore wind power with shallow cover, including the following steps:
步骤一:利用海上自升式平台或海上风电施工船将所有所述螺旋桩2逐一下沉至设计桩位,通过施工船舶连接杆配合螺旋桩安装连接部件2-5与螺旋桩2顶端相连,将螺旋桩2旋入到覆盖层中,到达设计深度后,反向扭转连接杆实现螺旋桩安装连接部件2-5的分离;Step 1: Use the offshore jack-up platform or the offshore wind power construction ship to sink all the screw piles 2 to the design pile position one by one, and connect the screw piles 2 to the top of the screw piles 2 through the construction ship connecting rod and the screw pile installation connection parts 2-5. Screw the screw pile 2 into the covering layer, and after reaching the design depth, reversely twist the connecting rod to realize the separation of the screw pile installation and connecting parts 2-5;
步骤二:将所述重力盘3吊装下沉,并使所有所述螺旋桩安装座3-3穿过所有所述螺旋桩2,利用重力盘3的自重或外加压力作用使螺旋桩安装座3-3中的插销3-5与螺旋桩插销孔2-4对接;然后,通过水下灌浆设备将水硬性混凝土灌注至螺旋桩安装座3-3,实现螺旋桩2与重力盘3的刚性连接;Step 2: Lift and sink the gravity plate 3, make all the screw pile mounts 3-3 pass through all the screw piles 2, and use the self-weight of the gravity plate 3 or the action of external pressure to make the screw pile mounts 3 The bolt 3-5 in -3 is docked with the bolt hole 2-4 of the screw pile; then, the hydraulic concrete is poured into the screw pile mounting seat 3-3 through the underwater grouting equipment to realize the rigid connection between the screw pile 2 and the gravity plate 3 ;
步骤三:将所述单桩1吊装下沉并穿过中心环3-1,通过自重或外加压力作用使其部分贯入泥面以下,然后,通过沉桩设备将单桩1打入到设计深度,即单桩套环1-1与重力盘的中心环接触时,然后,通过水下灌浆设备将水硬性混凝土灌注至中心环3-1,待混凝土产生足够的强度后,使单桩、螺旋桩和重力盘形成整体受荷。Step 3: Lift and sink the monopile 1 and pass through the central ring 3-1, partially penetrate below the mud surface by self-weight or external pressure, and then drive the monopile 1 into the design through the pile driving equipment. Depth, that is, when the single pile collar 1-1 is in contact with the center ring of the gravity disk, then pour hydraulic concrete into the center ring 3-1 through the underwater grouting equipment, and after the concrete has sufficient strength, make the single pile, The screw pile and the gravity disk form an integral load.
本发明中,通过将多个长短不同、叶片数量不同的螺旋桩通过连接杆件和中心单桩基础形成一个组合体,中心单桩打入地基,中心单桩与中心筒通过灌浆连接形成整体;通过灌浆把连接件与单桩基础锚固;最后在连接槽中加入堆石与凝胶介质,与中心单桩和螺旋桩形成整体;通过实施可知,不仅能适应更大水深,而且还避免了单桩基础嵌岩成本高的 问题,长短不同、叶片不同的螺旋桩可以增加较大的抗倾覆和抗拔承载力。此外,连接槽中的凝胶石碓既能透水又能起到防冲刷作用。同时,还具有投资成本低、施工速度快等优点。In the present invention, a plurality of screw piles with different lengths and different numbers of blades are formed into a composite body through connecting rods and a central single pile foundation, the central single pile is driven into the foundation, and the central single pile and the central cylinder are connected by grouting to form a whole; The connecting piece and the monopile foundation are anchored by grouting; finally, rockfill and gel medium are added to the connection groove to form a whole with the central monopile and the screw pile; through the implementation, it can not only adapt to larger water depths, but also avoid single piles. Due to the high cost of rock-socketed pile foundations, screw piles with different lengths and blades can increase the anti-overturning and pull-out bearing capacity. In addition, the gel stone moor in the connecting groove is both water permeable and anti-scour. At the same time, it also has the advantages of low investment cost and fast construction speed.

Claims (10)

  1. 一种适用于浅覆盖层的海上风电新型基础,其特征在于:它包括单桩(1),所述单桩(1)上固定安装有重力盘(3),所述重力盘(3)的外围均布固定安装有多根螺旋桩(2);相邻的螺旋桩(2)之间固定相连并构成整体结构。A new type of offshore wind power foundation suitable for shallow covering layer is characterized in that: it comprises a single pile (1), a gravity disk (3) is fixedly installed on the single pile (1), and the gravity disk (3) is A plurality of helical piles (2) are uniformly distributed and fixedly installed on the periphery; the adjacent helical piles (2) are fixedly connected to form an integral structure.
  2. 根据权利要求1所述的一种适用于浅覆盖层的海上风电新型基础,其特征在于:所述单桩(1)采用大直径钢管桩;在单桩(1)上设置有用于固定重力盘(3)的套环(1-1),并使得两者之间构成刚性连接。A new type of offshore wind power foundation suitable for shallow cover layer according to claim 1, characterized in that: the single pile (1) adopts a large-diameter steel pipe pile; The collar (1-1) of the disc (3), and makes a rigid connection between the two.
  3. 根据权利要求1或2所述的一种适用于浅覆盖层的海上风电新型基础,其特征在于:所述重力盘(3)包括重力盘基础(3-4),在重力盘本基础(3-4)的中心部位设置有中心环(3-1);所述单桩(1)穿过中心环(3-1),且两者构成接触配合;所述重力盘基础(3-4)上并以中心环(3-1)为中心均布固定有多根连接杆件(3-2),连接杆件(3-2)的另一端固定有用于安装螺旋桩(2)的螺旋桩安装座(3-3),所述螺旋桩安装座(3-3)的内侧壁上均布设置有多个插销(3-5)。A new type of offshore wind power foundation suitable for shallow cover layer according to claim 1 or 2, characterized in that: the gravity plate (3) comprises a gravity plate foundation (3-4), and the gravity plate base (3) -4) A central ring (3-1) is arranged at the central part; the monopile (1) passes through the central ring (3-1), and the two form a contact fit; the gravity disk foundation (3-4) A plurality of connecting rods (3-2) are evenly distributed and fixed on the center ring (3-1), and the other end of the connecting rods (3-2) is fixed with a screw pile for installing the screw pile (2). A mounting seat (3-3), wherein a plurality of pins (3-5) are evenly distributed on the inner side wall of the screw pile mounting seat (3-3).
  4. 根据权利要求3所述的一种适用于浅覆盖层的海上风电新型基础,其特征在于:所述重力盘基础(3-4)采用混凝土结构或填充物结构;所述混凝土结构采用在岸上整体预制结构形式;所述填充物结构采用胶结堆石体,所述胶结堆石体为填筑散粒堆石料,并通过水下灌浆技术形成具有高透水性的胶结堆石体、结构化胶结堆石体。A new type of offshore wind power foundation suitable for shallow cover layer according to claim 3, characterized in that: the gravity disk foundation (3-4) adopts a concrete structure or a filler structure; Prefabricated structural form; the filler structure adopts cemented rockfill body, and the cemented rockfill body is filled with loose-grained rockfill material, and the cemented rockfill body and structured cemented pile with high water permeability are formed by underwater grouting technology stone body.
  5. 根据权利要求1所述的一种适用于浅覆盖层的海上风电新型基础,其特征在于:所述螺旋桩(2)包括钢管桩(2-1),在钢管桩(2-1)的外壁上并沿其长度方向设置有螺旋桩叶片(2-2),钢管桩(2-1)的底端设置有螺旋桩桩头(2-3),钢管桩(2-1)的顶端设置有用于和重力盘(3)的插销(3-5)相配合的螺旋桩插销孔(2-4)。A new type of offshore wind power foundation suitable for shallow covering layer according to claim 1, characterized in that: the screw pile (2) comprises a steel pipe pile (2-1), and the steel pipe pile (2-1) The outer wall of the steel pipe pile (2-1) is provided with a screw pile blade (2-2) along its length direction, the bottom end of the steel pipe pile (2-1) is provided with a screw pile head (2-3), and the steel pipe pile (2-1) A screw pile bolt hole (2-4) for matching with the bolt (3-5) of the gravity plate (3) is provided at the top of the spool.
  6. 根据权利要求1或5所述的一种适用于浅覆盖层的海上风电新型基础,其特征在于:所述螺旋桩(2)的顶部设置有用于和桩体下沉施工设备快速拆卸相连的螺旋桩安装连接部件(2-5),螺旋桩安装连接部件(2-5)包括固定在钢管桩(2-1)顶端的螺旋桩安装键(2-5-1),螺旋桩安装键(2-5-1)与桩体下沉施工设备的传动杆底端的螺旋桩安装键槽(2-5-2)配合相连,并传递扭矩。A new type of offshore wind power foundation suitable for shallow covering layer according to claim 1 or 5, characterized in that: the top of the screw pile (2) is provided with a screw for quick disassembly and connection with the pile sinking construction equipment The pile installation connection part (2-5), the screw pile installation connection part (2-5) includes the screw pile installation key (2-5-1) fixed on the top of the steel pipe pile (2-1), the screw pile installation key ( 2-5-1) It is connected with the screw pile installation keyway (2-5-2) at the bottom end of the transmission rod of the pile sinking construction equipment, and transmits the torque.
  7. 根据权利要求5所述的一种适用于浅覆盖层的海上风电新型基础,其特征在于:所述螺旋桩叶片(2-2)呈环状弧形,且叶片倾角、数量、间隔和直径能够根据地质条件和风机机组载荷进行选择使用。A new type of offshore wind power foundation suitable for shallow covering layers according to claim 5, characterized in that: the screw pile blades (2-2) are annular arcs, and the inclination angle, number, interval and diameter of the blades can be Select and use according to geological conditions and fan unit load.
  8. 根据权利要求1所述的一种适用于浅覆盖层的海上风电新型基础,其特征在于:所述重力盘(3)的结构型式和螺旋桩(2)的阵列布置方式可以为三角形、正方形、六边形或圆形;其螺旋桩(2)的数量和阵列排布方式能够根据地质条件和风机机组载荷的不同进行选择调整使用。A new type of offshore wind power foundation suitable for shallow covering layer according to claim 1, characterized in that: the structural type of the gravity disk (3) and the array arrangement of the screw piles (2) can be triangular, square, Hexagonal or circular; the number and array arrangement of the screw piles (2) can be selected and adjusted according to the different geological conditions and the load of the fan unit.
  9. 根据权利要求3所述的一种适用于浅覆盖层的海上风电新型基础,其特征在于:所述重力盘基础(3-4)的截面采用矩形或者梯形。A new type of offshore wind power foundation suitable for shallow cover layer according to claim 3, characterized in that: the cross section of the gravity disk foundation (3-4) is rectangular or trapezoidal.
  10. 权利要求1-9任意一项所述适用于浅覆盖层的海上风电新型基础的施工方法,其特征在于包括以下步骤:The construction method for a new type of offshore wind power foundation suitable for shallow covering layers according to any one of claims 1-9, characterized in that it comprises the following steps:
    步骤一:利用海上自升式平台或海上风电施工船将所有所述螺旋桩(2)逐一下沉至设计桩位,通过施工船舶连接杆配合螺旋桩安装连接部件(2-5)与螺旋桩(2)顶端相连,将螺旋桩(2)旋入到覆盖层中,到达设计深度后,反向扭转连接杆实现螺旋桩安装连接部件(2- 5)的分离;Step 1: Use the offshore jack-up platform or the offshore wind power construction ship to sink all the screw piles (2) to the design pile position one by one, and install the connecting parts (2-5) and the screw piles through the construction ship connecting rods and the screw piles (2) The top ends are connected, and the screw pile (2) is screwed into the covering layer, and after reaching the design depth, reversely twist the connecting rod to realize the separation of the screw pile installation connecting parts (2-5);
    步骤二:将所述重力盘(3)吊装下沉,并使所有所述螺旋桩安装座(3-3)穿过所有所述螺旋桩(2),利用重力盘(3)的自重或外加压力作用使螺旋桩安装座(3-3)中的插销(3-5)与螺旋桩插销孔(2-4)对接;然后,通过水下灌浆设备将水硬性混凝土灌注至螺旋桩安装座(3-3),实现螺旋桩(2)与重力盘(3)的刚性连接;Step 2: hoist and sink the gravity plate (3), and make all the screw pile mounts (3-3) pass through all the screw piles (2), using the self-weight of the gravity plate (3) or an additional The pressure action makes the bolt (3-5) in the screw pile mounting seat (3-3) butt with the screw pile bolt hole (2-4); then, the hydraulic concrete is poured into the screw pile mounting seat ( 3-3), to realize the rigid connection between the screw pile (2) and the gravity plate (3);
    步骤三:将所述单桩(1)吊装下沉并穿过中心环(3-1),通过自重或外加压力作用使其部分贯入泥面以下,然后,通过沉桩设备将单桩(1)打入到设计深度,即单桩套环(1-1)与重力盘的中心环接触时,然后,通过水下灌浆设备将水硬性混凝土灌注至中心环(3-1),待混凝土产生足够的强度后,使单桩、螺旋桩和重力盘形成整体受荷。Step 3: The single pile (1) is hoisted and sunk through the central ring (3-1), partially penetrated below the mud surface by self-weight or external pressure, and then the single pile ( 1) Drive to the design depth, that is, when the single pile collar (1-1) is in contact with the center ring of the gravity disk, then pour hydraulic concrete into the center ring (3-1) through the underwater grouting equipment, and wait for the concrete After sufficient strength is generated, monopile, helical pile and gravity disk are integrally loaded.
PCT/CN2021/130649 2020-12-17 2021-11-15 Novel offshore wind turbine foundation suitable for shallow covering layer and construction method therefor WO2022127466A1 (en)

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