WO2023143148A1 - 具有蜂窝式地下连续墙的风机基础及其施工方法 - Google Patents

具有蜂窝式地下连续墙的风机基础及其施工方法 Download PDF

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Publication number
WO2023143148A1
WO2023143148A1 PCT/CN2023/072198 CN2023072198W WO2023143148A1 WO 2023143148 A1 WO2023143148 A1 WO 2023143148A1 CN 2023072198 W CN2023072198 W CN 2023072198W WO 2023143148 A1 WO2023143148 A1 WO 2023143148A1
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WIPO (PCT)
Prior art keywords
honeycomb
underground
wall
diaphragm wall
continuous wall
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PCT/CN2023/072198
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English (en)
French (fr)
Inventor
蒋河川
张立英
张国
张明杰
王献文
孟欣
易里坤
王学平
鲁莫尔
赵广赫
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中国华能集团清洁能源技术研究院有限公司
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Publication of WO2023143148A1 publication Critical patent/WO2023143148A1/zh

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    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D27/00—Foundations as substructures
    • E02D27/32—Foundations for special purposes
    • E02D27/42—Foundations for poles, masts or chimneys
    • E02D27/425—Foundations for poles, masts or chimneys specially adapted for wind motors masts
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D27/00—Foundations as substructures
    • E02D27/30—Foundations made with permanent use of sheet pile bulkheads, walls of planks, or sheet piling boxes
    • 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
    • F03D13/22—Foundations specially adapted for wind motors
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D2250/00—Production methods
    • E02D2250/0023—Cast, i.e. in situ or in a mold or other formwork
    • 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
    • Y02E10/728—Onshore wind turbines

Definitions

  • the disclosure belongs to the technical field of wind power, and in particular relates to a fan foundation with a honeycomb underground continuous wall and a construction method thereof.
  • Onshore wind turbines are one of the important forms of wind power generation.
  • the superstructure of the wind turbine is relatively large and heavy, so the stability of the foundation of the wind turbine against overturning, shearing, and fatigue is very important.
  • Common forms of onshore wind turbine foundations include pile foundations, extended foundations, etc.
  • the pile foundation is composed of foundation piles set vertically or obliquely in the foundation, and connected with the cap to bear the upper load.
  • the extended foundation is to expand the foundation section appropriately so that the load acting on the base is less than the maximum bearing capacity allowed by the foundation.
  • the weight and load of the wind turbine tower have increased the safety requirements for the wind turbine infrastructure. Under such conditions, traditional wind turbine foundations have problems such as small bearing capacity and large footprint, which cannot meet the needs of large-capacity wind turbines.
  • embodiments of the present disclosure propose a fan foundation with a honeycomb structure underground diaphragm wall.
  • the wind turbine foundation with a honeycomb structure underground diaphragm wall includes: a honeycomb type underground diaphragm wall and a platform.
  • the cross-section perpendicular to the vertical direction of the honeycomb underground diaphragm wall is a honeycomb structure, and a number of holes extending along the vertical direction are defined in the honeycomb type underground diaphragm wall, and the holes are filled with soil.
  • the platform is located above and connected to the honeycomb underground continuous wall.
  • the cellular underground continuous wall includes several honeycomb units closely arranged, the holes are defined in the middle of the honeycomb units, and a section of wall is shared by adjacent honeycomb units.
  • the honeycomb unit is a hollow regular polygonal prism structure.
  • the honeycomb unit is a hollow regular hexagonal prism structure.
  • the cellular underground continuous wall is composed of seven honeycomb units with the same structure, and six of the honeycomb units are arranged around the central honeycomb unit and connected in sequence.
  • the side length of the outer peripheral contour of the cross-section perpendicular to the vertical direction of the honeycomb unit is 1.5-2.5m.
  • the thickness of the cellular underground continuous wall is greater than or equal to 400 mm.
  • the height of the honeycomb underground continuous wall in the vertical direction is 10-20m.
  • the cellular underground continuous wall is a symmetrical structure.
  • the wind turbine foundation is the wind turbine foundation according to the above-mentioned embodiments of the present disclosure, and the construction method includes:
  • Step 1 Construct the guide wall
  • Step 2 Groove construction and groove cleaning work
  • Step 3 prefabricating the reinforcement cage and sinking the reinforcement cage into the groove
  • Step 4 pouring concrete to form the honeycomb underground continuous wall
  • Step 5 pouring to form the cap.
  • Fig. 1 is a structural diagram of a honeycomb underground diaphragm wall fan foundation provided by an embodiment of the present disclosure.
  • Fig. 2 is a cross-sectional view of the honeycomb underground continuous wall provided by the embodiment of the present disclosure.
  • FIG. 3 is a partially enlarged schematic view of FIG. 1 .
  • Fan foundation 100 honeycomb underground diaphragm wall 1; honeycomb unit 11; hole 12; cap 2; anchor bolt cage assembly 3; flange 31; upper anchor plate 32; high-strength grouting material 33; anchor rod 34; lower anchor plate 35; steel cage 4.
  • FIGS. 1-3 The basic structure of the wind turbine foundation 100 with honeycomb underground diaphragm wall in the embodiment of the present disclosure will be described below according to FIGS. 1-3 .
  • the wind turbine foundation 100 includes a honeycomb underground continuous wall 1 and a platform 2 .
  • the honeycomb underground diaphragm wall 1 is buried underground as the support structure of the fan foundation 100, the bottom of the cap 2 is connected to the top of the honeycomb underground diaphragm wall 1, the top of the cap 2 is flush with the ground, and the top of the cap 2 is used for Connect to above-ground structures such as wind turbines.
  • both the honeycomb underground diaphragm wall 1 and the platform 2 are located below the ground level, and the honeycomb underground diaphragm wall 1 is located below the platform 2 .
  • the honeycomb underground continuous wall 1 is composed of a continuous wall body extending in the vertical direction, and its cross section perpendicular to the vertical direction is a honeycomb structure.
  • the honeycomb underground continuous wall 1 includes several honeycomb units 11, which are closely arranged to form the honeycomb underground continuous wall 1.
  • the middle part of each honeycomb unit 11 defines a hole 12 extending in the vertical direction, and the hole 12 is filled with soil . It can be understood that adjacent honeycomb units 11 share one cell wall (wall body).
  • the honeycomb unit 11 is a cylindrical structure, and the walls of several honeycomb units 11 are connected to each other to form a honeycomb underground continuous wall 1 extending in the vertical direction, and each hole 12 inside the honeycomb underground continuous wall 1 is filled with soil , the soil filled in the hole 12 plays a role in further enhancing the anti-overturning and anti-extrusion properties of the fan foundation.
  • the fan foundation in the embodiment of the present disclosure includes a honeycomb underground diaphragm wall for supporting the platform.
  • the honeycomb underground diaphragm wall is composed of several honeycomb units arranged closely.
  • the foundation soil on the outside and inside of the underground diaphragm wall exerts a certain pressure on the wall, making the honeycomb underground diaphragm wall's anti-extrusion ability, anti-overturning stability and bearing capacity better than traditional diaphragm walls with circular or single polygonal cross-sections. structure.
  • the honeycomb underground diaphragm wall has a strong bearing capacity, it can have a smaller footprint while meeting the load requirements of the wind turbine.
  • the wind turbine foundation of the embodiments of the present disclosure can be applied to the foundation of land wind turbines, especially the natural foundation of large-capacity wind turbines.
  • the extension direction of the fan foundation 100 is defined as the up and down direction, and the up and down directions are shown by the arrows in FIG. 1 .
  • the honeycomb underground diaphragm wall fan foundation 100 includes a honeycomb underground diaphragm wall 1 , a cap 2 , an anchor bolt cage assembly 3 and a reinforcement cage 4 .
  • the honeycomb underground continuous wall 1 is formed by a plurality of closely arranged honeycomb units 11, and adjacent honeycomb units 11 share a section of wall. It can be understood that the walls of several closely arranged honeycomb units 11 are in a continuous structure, that is, one-piece walls formed by one-time pouring.
  • the structural shapes of several honeycomb units 11 constituting the honeycomb underground continuous wall 1 are the same, and the honeycomb units 11 are hollow regular hexagonal prism structures.
  • the cross section of the honeycomb unit 11 perpendicular to the vertical direction is a regular hexagonal structure.
  • the outer peripheral contour of the cross section of the honeycomb unit 11 perpendicular to the vertical direction is a regular hexagon
  • the inner peripheral contour of the cross section of the honeycomb unit 11 perpendicular to the vertical direction is a regular hexagon
  • the cross section of the central hole 12 of the honeycomb unit 11 is a regular hexagon.
  • the inner peripheral profile of the cross section perpendicular to the vertical direction of the honeycomb unit 11 may be circular or other shapes, that is, the cross section of the central hole 12 of the honeycomb unit 11 may be circular or other shapes.
  • the honeycomb underground continuous wall 1 in this embodiment is composed of seven honeycomb units 11 densely arranged and connected to each other. As shown in FIG. 2 , one honeycomb unit 11 is located in the middle, and the other six honeycomb units 11 are arranged in sequence around the central honeycomb unit 11 . It can be understood that the honeycomb units 11 located at the periphery all share a section of wall with the honeycomb unit 11 in the middle, and since the honeycomb unit 11 in this embodiment is formed by connecting six sections of walls end to end, the honeycomb unit 11 in the middle is formed All the walls are shared with other cellular unit 11 walls. Therefore, it can also be considered that the honeycomb unit 11 in the middle is formed by six honeycomb units 11 successively connected in the circumferential direction.
  • both the exterior of the honeycomb underground diaphragm wall 1 and the interior of the hole 12 have compacted soil, and the soil provides a certain compressive force for the wall to support the wall.
  • the bending moment load is transmitted downward to the honeycomb underground diaphragm wall 1, and each section of the wall of each honeycomb unit 11 constituting the honeycomb underground diaphragm wall 1 can jointly share the bending moment load
  • the honeycomb underground continuous wall 1 provided by the embodiment of the present disclosure has stronger anti-overturning stability than the related art.
  • the honeycomb structure of the honeycomb underground diaphragm wall 1 when its internal hole 12 is filled with soil, it can withstand greater pressure from the external soil, so the honeycomb provided by the embodiment of the present disclosure Compared with the related technology, the type underground diaphragm wall 1 has stronger anti-compression performance.
  • the honeycomb underground continuous wall 1 can be composed of other numbers of honeycomb units 11, or the honeycomb units 11 that make up the honeycomb underground continuous wall 1 can also have other arrangements, and this disclosure does not limit.
  • the honeycomb unit 11 is not limited to the above-mentioned regular hexagonal prism structure, for example, in other alternative embodiments, the honeycomb unit 11 may also be a regular triangular prism structure, a regular square prism structure, and the like.
  • the honeycomb underground continuous wall 1 can be composed of six honeycomb units 11, the six honeycomb units 11 are arranged in sequence along the circumference and two adjacent honeycomb units 11 share a section of wall, forming a regular hexagonal prism structure Honeycomb underground diaphragm wall 1.
  • the honeycomb units 11 constituting the honeycomb underground continuous wall 1 may include various types, for example, the honeycomb units 11 of the regular triangular prism structure and the honeycomb units 11 of the regular hexagonal prism structure are arranged in a mixed manner.
  • the honeycomb unit 11 is not a regular polygonal prism structure, the construction is more difficult, and the stress on each side is uneven. Therefore, it is preferable to choose the shape of the honeycomb unit 11 to be a regular polygonal prism structure, so that the stress on each section of the wall is uniform, and the construction is convenient.
  • the honeycomb underground continuous wall 1 has the same size in multiple directions, or in other words, the honeycomb underground continuous wall 1 has a symmetrical structure, so that the structure of the fan foundation 100 is more stable and reliable.
  • the side length of the outer peripheral contour (regular hexagon) of the cross section of the honeycomb unit 11 perpendicular to the vertical direction is 1.5-2.5m. Further optionally, the side length of the outer peripheral contour (regular hexagon) of the cross section of the honeycomb unit 11 perpendicular to the vertical direction is 1.5-2.0m, such as any value among 1.5m, 2m, and 2.5m.
  • the thickness of the honeycomb underground continuous wall 1 is greater than or equal to 400mm.
  • the thickness of the honeycomb underground continuous wall 1 can be any value of 400mm, 500mm, 700mm, or 1000mm.
  • the strength of the honeycomb underground diaphragm wall 1 is not lower than C20.
  • the height of the honeycomb underground continuous wall 1 is 10-20m, for example, the height of the honeycomb underground continuous wall 1 is any one of 10m, 12m, 14m, 16m, 18m and 20m.
  • the platform 2 is a circular expanded foundation platform.
  • the central axis (vertical direction) of the honeycomb underground diaphragm wall 1 and the central axis of the circular expanded foundation cap 2 are on a straight line.
  • the diameter of the circular section of the bottom surface of the platform 2 is 8m-14m.
  • the diameter and length of the circular section of the bottom surface of the platform 2 can be any value selected from 8m, 10m, 12m, and 14m. It should be noted that, The circular section diameter of the bottom surface of the platform cap 2 should be greater than the maximum width of the honeycomb underground diaphragm wall 1 .
  • the anchor bolt assembly 3 includes a flange 31 , an upper anchor plate 32 , a high-strength grouting material 33 , an anchor rod 34 and a lower anchor plate 35 .
  • the upper anchor plate 32 is located above the cap 2 , the upper surface of the upper anchor plate 32 and the cap 2 is filled with a high-strength grouting material 33 , and the flange 31 is located above the upper anchor plate 32 .
  • the lower anchor plate 35 is positioned at the bottom of the cap 2 , the anchor rod 4 is positioned in the cap 2 , the upper end passes through the flange 31 and is tensioned, and the lower end is connected with the lower anchor plate 35 to strengthen the strength of the cap 2 .
  • the reinforcement cage 4 is located in the honeycomb underground diaphragm wall 1 and is used to enhance the structural strength of the poured honeycomb underground diaphragm wall 1 .
  • the reinforcement cage 4 is a continuous structure and corresponds to the wall structure of the honeycomb underground diaphragm wall 1, so that the structural strength of the honeycomb underground diaphragm wall 1 is optimized, or the reinforcement cage 4 is spliced by multiple sections of steel bars, so as to Simplify construction difficulty.
  • the reinforcement cage 4 may only be arranged in a part of the honeycomb underground continuous wall 1 to reduce the construction cost.
  • the top of the steel cage 4 protrudes from the top of the honeycomb underground diaphragm wall 1 and extends into the cap 2, so as to improve the structural stability of the honeycomb underground diaphragm wall.
  • the reinforcement cage 4 that goes deep into the platform 2 can be connected with the reinforcement (not shown in the figure) inside the platform 2 to further increase the connection strength and rigidity.
  • the bottom of the reinforcement cage 4 is flush with the bottom of the honeycomb underground continuous wall 1 , so as to optimize the structural strength of the honeycomb underground continuous wall 1 .
  • the bottom of the steel cage 4 can be located above the bottom of the honeycomb underground continuous wall 1, that is, the steel cage 4 does not need to penetrate the honeycomb underground continuous wall 1 up and down, so as to save construction costs.
  • Embodiments of the present disclosure also propose a construction method for the wind turbine foundation 100 .
  • the fan foundation 100 is the fan foundation 100 with the honeycomb underground diaphragm wall 1 in any of the above-mentioned embodiments, and the construction method mainly includes: Step 1 to Step 5.
  • Step 1 Construct the guide wall
  • Step 2 Groove construction and groove cleaning work
  • Step 3 prefabricating the reinforcement cage and sinking the reinforcement cage into the groove
  • Step 4 pouring concrete to form a honeycomb underground continuous wall
  • Step 5 Pouring to form caps.
  • the fan foundation with the honeycomb structure underground diaphragm wall through the setting of the honeycomb structure underground diaphragm wall, the anti-overturning stability of the fan is enhanced, the strength of the fan foundation is improved, the service life of the fan is extended, and the cost of the fan foundation is reduced. footprint.
  • step of forming the honeycomb underground diaphragm wall 1 in step 4 is an integrated pouring method, and the conduit method can be used for underwater concrete pouring, and the reinforcement cage 4 in step 3 is poured therein.
  • first and second are used for descriptive purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features.
  • the features defined as “first” and “second” may explicitly or implicitly include at least one of these features.
  • “plurality” means at least two, such as two, three, etc., unless otherwise specifically defined.
  • a first feature being “on” or “under” a second feature may mean that the first and second features are in direct contact, or that the first and second features are indirect through an intermediary. touch.
  • “above”, “above” and “above” the first feature on the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature.
  • “Below”, “beneath” and “beneath” the first feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is less horizontally than the second feature.
  • the terms “one embodiment,””someembodiments,””example,””specificexamples,” or “some examples” mean a specific feature, structure, material, or feature described in connection with the embodiment or example. Features are included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the described specific features, structures, materials or characteristics may be combined in any suitable manner in any one or more embodiments or examples. In addition, those skilled in the art may refer to the Different embodiments or examples and features of different embodiments or examples described are combined and combined.

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Abstract

一种具有蜂窝式地下连续墙（1）的风机基础（100）及施工方法，具有蜂窝式地下连续墙（1）的风机基础（100）包括蜂窝式地下连续墙（1）和承台（2）。蜂窝式地下连续墙（1）埋设于地基内，承台（2）位于蜂窝式地下连续墙（1）的上方并与其相连，蜂窝式地下连续墙（1）垂直于竖直方向上的横截面为蜂窝结构。蜂窝式地下连续墙（1）内限定出若干沿竖直方向延伸的孔洞（12），孔洞（12）内填充有土体。

Description

具有蜂窝式地下连续墙的风机基础及其施工方法
相关申请的交叉引用
本申请基于申请号为202210094469.0、申请日为2022年1月26日的中国专利申请提出，并要求该中国专利申请的优先权，该中国专利申请的全部内容在此引入本申请作为参考。
技术领域
本公开属于风电技术领域，尤其涉及一种具有蜂窝式地下连续墙的风机基础及其施工方法。
背景技术
陆上风力发电机是风力发电的重要形式之一，风机上部结构较大、自身较重，所以风机基础的抗倾覆、抗剪、抗疲劳的稳定性十分重要。陆上风机基础常用的形式有桩基础、扩展基础等。桩基础由基桩竖直或倾斜设置在地基中，并和承台连接组成来承受上部载荷。扩展基础是将基础截面适当扩大，使作用在基底的载荷小于地基所能允许的最大承载力。目前随着大容量风电机组被推广应用，风机的塔筒重量和载荷对风机基础结构的安全性要求有所提高。在此条件下，传统风机基础存在承载能力小、占地面积大等问题，不能满足大容量风电机组的需求。
发明内容
为此，本公开的实施例提出了具有蜂窝结构地下连续墙的风机基础。
根据本公开实施例的具有蜂窝结构地下连续墙的风机基础包括：蜂窝式地下连续墙和承台。所述蜂窝式地下连续墙的垂直于竖直方向上的横截面为蜂窝结构，所述蜂窝式地下连续墙内限定出若干沿竖直方向延伸的孔洞，所述孔洞内填充有土体，所述承台位于所述蜂窝式地下连续墙的上方并与其相连。
在一些实施例中，所述蜂窝式地下连续墙包括紧密排列的若干蜂窝单位，所述蜂窝单位中部限定出所述孔洞，相邻所述蜂窝单位共用一段墙体。
在一些实施例中，所述蜂窝单位为中空的正多棱柱结构。
在一些实施例中，所述蜂窝单位为中空的正六棱柱结构。
在一些实施例中，所述蜂窝式地下连续墙由七个结构相同的所述蜂窝单位组成，其中的六个所述蜂窝单位围绕位于中部的所述蜂窝单位排布并依次相连。
在一些实施例中，所述蜂窝单位垂直与竖直方向的横截面的外周轮廓的边长为1.5-2.5m。
在一些实施例中，所述蜂窝式地下连续墙的墙体厚度大于等于400mm。
在一些实施例中，所述蜂窝式地下连续墙在竖直方向上的高度为10-20m。
在一些实施例中，所述蜂窝式地下连续墙为对称结构。
在一些实施例中，所述风机基础为根据本公开上述实施例的风机基础，所述施工方法包括：
步骤1：构筑导墙；
步骤2：成槽施工并进行清槽工作；
步骤3：预制钢筋笼并将钢筋笼沉放至所述槽中；
步骤4：混凝土浇筑形成所述蜂窝式地下连续墙；
步骤5：浇筑形成所述承台。
附图说明
图1是本公开实施例提供的蜂窝式地下连续墙风机基础的结构图。
图2是本公开实施例提供的蜂窝式地下连续墙剖面图。
图3是图1的局部放大示意图。
附图标记：
风机基础100；蜂窝式地下连续墙1；蜂窝单位11；孔洞12；承台2；锚栓笼组合件3；法兰31；上锚板32；高强灌浆料33；锚杆34；下锚板35；钢筋笼4。
具体实施方式
下面详细描述本公开的实施例，所述实施例的示例在附图中示出。下面通过参考附图描述的实施例是示例性的，旨在用于解释本公开，而不能理解为对本公开的限制。
下面根据图1-图3所示，描述本公开的实施例中的具有蜂窝式地下连续墙的风机基础100的基本结构。
风机基础100包括蜂窝式地下连续墙1和承台2。蜂窝式地下连续墙1埋设于地下作为风机基础100的支撑结构，承台2的底部与蜂窝式地下连续墙1的顶部相连，承台2的顶部与地面平齐，承台2的顶部用于连接风机等地面之上的结构。换言之，蜂窝式地下连续墙1及承台2均位于地平面之下，蜂窝式地下连续墙1又位于承台2的下方。
蜂窝式地下连续墙1由沿竖直方向延伸的连续墙体构成，其在垂直于竖直方向上的横截面为蜂窝结构。蜂窝式地下连续墙1包括若干蜂窝单位11，若干蜂窝单位11紧密排列形成蜂窝式地下连续墙1，每个蜂窝单位11中部限定出沿竖直方向延伸的孔洞12，孔洞12内填充有土体。可以理解的是，相邻蜂窝单位11共用一面孔壁(墙体)。换言之，蜂窝单位11为类筒状结构，若干蜂窝单位11的墙体彼此相连组成沿竖直方向延伸的蜂窝式地下连续墙1，蜂窝式地下连续墙1内部的各孔洞12内由土体填充，孔洞12内填充的土体起到进一步增强风机基础的抗倾覆性、抗挤压性的作用。
本公开实施例的风机基础包括用于支撑承台的蜂窝式地下连续墙，蜂窝式地下连续墙由紧密排列的若干蜂窝单位组成，若干蜂窝单位可以分散且共同承担大弯矩载荷，并且蜂窝式地下连续墙外侧以及内部的地基土向墙体施加一定的压力，使得蜂窝式地下连续墙的抗挤压能力、抗倾覆稳定性和承载能力优于传统的截面为圆形或单一多边形的连续墙结构。此外， 由于蜂窝式地下连续墙具有较强的承载能力，因此其在满足风电机组的载荷要求的情况下，可以具有更小的占地面积。
本公开实施例的风机基础可应用于陆上风电机组基础，特别是大容量机组的天然地基基础。
下面根据图1-图3描述本公开提供的一个具体实施例。为描述方便，将风机基础100的延伸方向定义为上下方向，上下方向如图1中的箭头所示。
如图1所示，蜂窝式地下连续墙风机基础100包括蜂窝式地下连续墙1、承台2、锚栓笼组合件3和钢筋笼4。
蜂窝式地下连续墙1由紧密排列的若干蜂窝单位11形成，相邻蜂窝单位11共用一段墙体。可以理解的是，紧密排列的若干蜂窝单位11的墙体呈连续结构，即为一体式墙体，经一次性浇筑而成。
进一步地，如图2所示，组成蜂窝式地下连续墙1的若干蜂窝单位11的结构形状相同，并且蜂窝单位11为中空的正六棱柱结构。换言之，蜂窝单位11与竖直方向垂直的横截面为正六边形结构。具体地，在本实施例中，蜂窝单位11与竖直方向垂直的横截面的外周轮廓为正六边形，并且，蜂窝单位11与竖直方向垂直的横截面的内周轮廓为正六边形，即蜂窝单位11的中部孔洞12的横截面为正六边形。可替换地，蜂窝单位11与竖直方向垂直的横截面的内周轮廓可以是圆形或其他形状，即蜂窝单位11的中部孔洞12的横截面可以是圆形或其他形状。
为了使蜂窝式地下连续墙1的结构更加均匀且合理，本实施例中的蜂窝式地下连续墙1由七个蜂窝单位11密铺排列并彼此相连而成。如图2所示，一个蜂窝单位11位于中部，其余六个蜂窝单位11围绕位于中部的蜂窝单位11依次排列。可以理解的是，位于***的蜂窝单位11均分别与中部的蜂窝单位11同用一段墙体，由于本实施例中的蜂窝单位11由六段墙体首尾相连形成，因此组成中部的蜂窝单位11的墙体均与其他蜂窝单位11墙体共用。因此也可以认为，中部的蜂窝单位11由六个沿周向依次相连的蜂窝单位11形成。
在实际应用时，蜂窝式地下连续墙1外部和内部孔洞12内均具有压实的土体，土体为墙体提供一定的压迫力以支撑墙体。风机基础100上方的风机受到强风力作用时，弯矩载荷向下传导至蜂窝式地下连续墙1，组成蜂窝式地下连续墙1的每个蜂窝单位11的每段墙体可以共同分担弯矩载荷，以避免倾覆，因此本公开实施例提供的蜂窝式地下连续墙1与相关技术相比具有更强的抗倾覆稳定性。此外，由于蜂窝式地下连续墙1的蜂窝式结构，再其内部孔洞12填充有土体的情况下，其能承受来自于外部土体的更大的压迫力，因此本公开实施例提供的蜂窝式地下连续墙1与相关技术相比具有更强的抗压迫性能。
当然，在其他实施例中，蜂窝式地下连续墙1可以由其他数量的蜂窝单位11构成，或者，组成蜂窝式地下连续墙1的蜂窝单位11还可以具有其他排列方式，本公开对此不做限制。
需要说明的是，蜂窝单位11不限于上述正六棱柱结构，例如在其他可替换实施例中，蜂窝单位11还可以为正三棱柱结构、正四棱柱结构等。作为示例，当蜂窝单位11为正三棱 柱结构时，蜂窝式地下连续墙1可以由六个蜂窝单位11组成，这六个蜂窝单位11沿周向依次排列并且相邻两个蜂窝单位11共用一段墙体，组成了类正六棱柱结构的蜂窝式地下连续墙1。此外，组成蜂窝式地下连续墙1的蜂窝单位11可以包括多种类型，例如正三棱柱结构的蜂窝单位11与正六棱柱结构的蜂窝单位11混合排列。当蜂窝单位11不是正多棱柱结构时，施工难度较大，并且各条边受力不均匀。因此优选选择蜂窝单位11形状为正多棱柱结构，使得每段墙体受力均匀，并且便于施工。
优选地，蜂窝式地下连续墙1在多个方向上尺寸相同，或者说，蜂窝式地下连续墙1为对称结构，以使风机基础100的结构更加稳定可靠。
可选地，蜂窝单位11垂直于竖直方向的横截面的外周轮廓(正六边形)的边长为1.5-2.5m。进一步可选地，蜂窝单位11垂直于竖直方向的横截面的外周轮廓(正六边形)的边长为1.5-2.0m，例如1.5m、2m、2.5m中的任一数值。
可选地，蜂窝式地下连续墙1墙体的厚度大于等于400mm，例如，蜂窝式地下连续墙1墙体的厚度可以选取400mm、500mm、700mm、1000mm中的任一数值。
可选地，蜂窝式地下连续墙1墙体的强度不低于C20。
可选地，蜂窝式地下连续墙1的高度为10-20m，例如，蜂窝式地下连续墙1的高度为10m、12m、14m、16m、18m、20m中的任一数值。
本实施例中，承台2为圆形扩展基础承台。蜂窝式地下连续墙1中心轴线(竖直方向)与圆形扩展基础承台2中心轴线在一条直线上。可选地，承台2的底面圆形截面直径为8m-14m，具体地，承台2的底面圆形截面直径长度可以选取8m、10m、12m、14m中的任意数值，需要说明的是，承台2的底面圆形截面直径应大于蜂窝式地下连续墙1的最大宽度尺寸。
如图3所示，锚栓组合件3包括法兰31、上锚板32、高强灌浆料33、锚杆34和下锚板35。上锚板32位于承台2的上方，上锚板32与承台2的上表面之间由高强灌浆料33填充，法兰31位于上锚板32的上方。下锚板35位于承台2的底部，锚杆4位于承台2内，上端穿过法兰31并拉紧，下端与下锚板35相连，加强承台2的强度。
钢筋笼4位于蜂窝式地下连续墙1内，用于增强浇注的蜂窝式地下连续墙1的结构强度。优选地，钢筋笼4为连续结构并与蜂窝式地下连续墙1的墙体结构相对应，使蜂窝式地下连续墙1的结构强度最优化，或者，钢筋笼4由多段钢筋拼接而成，以简化施工难度。可替换地，在其他实施例中，钢筋笼4还可以只设置在蜂窝式地下连续墙1的部分墙体内，以减少构造成本。
进一步的，如图2所示，为了提高风机基础100的结构稳定性，钢筋笼4的顶部从蜂窝式地下连续墙1的顶部伸出并伸入承台2内，以便提高蜂窝式地下连续墙1与承台2之间的连接强度和刚性。更进一步地，深入承台2内的钢筋笼4可以与承台2内部的钢筋(图中未示出)相连，以进一步提高连接强度和刚性。
优选地，如图2所示，钢筋笼4的底部与蜂窝式地下连续墙1的底部平齐，以使蜂窝式地下连续墙1的结构强度最优化。当然在其他实施例中，钢筋笼4的底部可以位于蜂窝式地下连续墙1底部的上方，即钢筋笼4无需上下贯穿蜂窝式地下连续墙1，以节约构造成本。
本公开的实施例还提出一种风机基础100的施工方法。风机基础100为上述任一项实施例中的具有蜂窝式地下连续墙1的风机基础100，施工方法主要包括：步骤1至步骤5。
步骤1：构筑导墙；
步骤2：成槽施工并进行清槽工作；
步骤3：预制钢筋笼并将钢筋笼沉放至所述槽中；
步骤4：混凝土浇筑形成蜂窝式地下连续墙；
步骤5：浇筑形成承台。
根据本公开实施例的具有蜂窝结构地下连续墙的风机基础，通过蜂窝结构地下连续墙的设置，增强风机的抗倾覆稳定性，提高风机基础的强度，延长风机的使用寿命，减小风机基础的占地面积。
需要说明的是，步骤4中形成蜂窝式地下连续墙1的步骤为一体浇筑方法，可选采用导管法进行水下混凝土浇筑，并将步骤3中的钢筋笼4浇筑其中。
在本公开的描述中，需要理解的是，术语“中心”、“纵向”、“横向”、“长度”、“宽度”、“厚度”、“上”、“下”、“前”、“后”、“左”、“右”、“竖直”、“水平”、“顶”、“底”“内”、“外”、“顺时针”、“逆时针”、“轴向”、“径向”、“周向”等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述本公开和简化描述，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本公开的限制。
此外，术语“第一”、“第二”仅用于描述目的，而不能理解为指示或暗示相对重要性或者隐含指明所指示的技术特征的数量。由此，限定有“第一”、“第二”的特征可以明示或者隐含地包括至少一个该特征。在本公开的描述中，“多个”的含义是至少两个，例如两个，三个等，除非另有明确具体的限定。
在本公开中，除非另有明确的规定和限定，术语“安装”、“相连”、“连接”、“固定”等术语应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或成一体；可以是机械连接，也可以是电连接或彼此可通讯；可以是直接相连，也可以通过中间媒介间接相连，可以是两个元件内部的连通或两个元件的相互作用关系，除非另有明确的限定。对于本领域的普通技术人员而言，可以根据具体情况理解上述术语在本公开中的具体含义。
在本公开中，除非另有明确的规定和限定，第一特征在第二特征“上”或“下”可以是第一和第二特征直接接触，或第一和第二特征通过中间媒介间接接触。而且，第一特征在第二特征“之上”、“上方”和“上面”可是第一特征在第二特征正上方或斜上方，或仅仅表示第一特征水平高度高于第二特征。第一特征在第二特征“之下”、“下方”和“下面”可以是第一特征在第二特征正下方或斜下方，或仅仅表示第一特征水平高度小于第二特征。
在本公开中，术语“一个实施例”、“一些实施例”、“示例”、“具体示例”、或“一些示例”等意指结合该实施例或示例描述的具体特征、结构、材料或者特点包含于本公开的至少一个实施例或示例中。在本说明书中，对上述术语的示意性表述不必须针对的是相同的实施例或示例。而且，描述的具体特征、结构、材料或者特点可以在任一个或多个实施例或示例中以合适的方式结合。此外，在不相互矛盾的情况下，本领域的技术人员可以将本说明书中 描述的不同实施例或示例以及不同实施例或示例的特征进行结合和组合。
尽管上面已经示出和描述了本公开的实施例，可以理解的是，上述实施例是示例性的，不能理解为对本公开的限制，本领域的普通技术人员在本公开的范围内可以对上述实施例进行变化、修改、替换和变型。

Claims (10)

  1. 一种具有蜂窝式地下连续墙的风机基础，包括：蜂窝式地下连续墙和承台，所述蜂窝式地下连续墙埋设于地基内，所述承台位于所述蜂窝式地下连续墙的上方并与其相连，所述蜂窝式地下连续墙的垂直于竖直方向上的横截面为蜂窝结构，所述蜂窝式地下连续墙内限定出若干沿竖直方向延伸的孔洞，所述孔洞内填充有土体。
  2. 根据权利要求1所述的具有蜂窝式地下连续墙的风机基础，其中，所述蜂窝式地下连续墙包括紧密排列的若干蜂窝单位，所述蜂窝单位中部限定出所述孔洞，相邻所述蜂窝单位共用一段墙体。
  3. 根据权利要求2所述的具有蜂窝式地下连续墙的风机基础，其中，所述蜂窝单位为中空的正多棱柱结构。
  4. 根据权利要求2所述的具有蜂窝式地下连续墙的风机基础，其中，所述蜂窝单位为中空的正六棱柱结构。
  5. 根据权利要求4所述的具有蜂窝式地下连续墙的风机基础，其中，所述蜂窝式地下连续墙由七个结构相同的所述蜂窝单位组成，其中的六个所述蜂窝单位围绕位于中部的所述蜂窝单位排布并依次相连。
  6. 根据权利要求4或5所述的具有蜂窝式地下连续墙的风机基础，其中，所述蜂窝单位垂直与竖直方向的横截面的外周轮廓的边长为1.5-2.5m。
  7. 根据权利要求1-5中任一项所述的具有蜂窝式地下连续墙的风机基础，其中，所述蜂窝式地下连续墙的墙体厚度大于等于400mm。
  8. 根据权利要求1-5中任一项所述的具有蜂窝式地下连续墙的风机基础，其中，所述蜂窝式地下连续墙在竖直方向上的高度为10-20m。
  9. 根据权利要求1-5中任一项所述的具有蜂窝式地下连续墙的风机基础，其中，所述蜂窝式地下连续墙为对称结构。
  10. 一种风机基础的施工方法，其中，所述风机基础为根据权利要求1-9中任一项所述的风机基础，所述施工方法包括：
    步骤1：构筑导墙；
    步骤2：成槽施工并进行清槽工作；
    步骤3：预制钢筋笼并将钢筋笼沉放至所述槽中；
    步骤4：混凝土浇筑形成所述蜂窝式地下连续墙；
    步骤5：浇筑形成所述承台。
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