CN215715470U - High-strength grouting pipe joint jacket foundation for offshore wind power - Google Patents

Abstract

The utility model discloses a high-strength grouting pipe node jacket foundation for offshore wind power, which comprises a fan bottom joint tower frame, a platform transition section, a jacket main body and steel pipe piles which are fixedly connected from top to bottom in sequence, wherein a plurality of supporting structures are arranged at intervals in the height direction of the jacket main body, and each supporting structure comprises a jacket main leg, a jacket diagonal brace and a jacket transverse brace which are fixedly connected through a plurality of pipe nodes. The utility model gives full play to the characteristics of low cost, high durability, fatigue resistance and strong bearing capacity of the steel pipe concrete, and provides a novel and reliable technical means for the development of offshore wind power resources in medium water depth and even deep sea water areas.

Description

High-strength grouting pipe joint jacket foundation for offshore wind power

Technical Field

The utility model relates to the field of offshore wind power development, in particular to a high-strength grouting pipe node jacket foundation for offshore wind power.

Background

With the rapid development of the industry in China, the demand on energy sources is increasing day by day. At present, China is in a key stage of energy transformation, offshore wind power development becomes an important solution for relieving energy supply and demand contradictions and reducing environmental pollution in China, and is a new growth point of energy development in China.

China is one of the most abundant countries of offshore wind resource reserves, the total amount of offshore wind resource development in China is about 7.5 hundred million kilowatts, and the total amount of offshore wind resource development in deep county is about 16 hundred million kilowatts. Offshore wind energy, as one of the best renewable energy sources with the greatest large-scale development prospect and industrialization at present, has become an important means for deeply promoting energy production, consumption revolution and promotion of atmospheric pollution prevention and control in China. Since 2018, newly-increased offshore wind power installed capacity in China is always in the first world, and by 2019, the total offshore wind power grid connection amount in China becomes the third world country second only in the United kingdom and Germany, and according to the development, the total offshore wind power grid connection amount in China will leap forward to the first world in 2025.

At present, the development of offshore shallow water wind power resources in China is basically saturated, and the development of offshore wind power resources is going to go into a medium transition water depth of 30m-50m from shallow water below 30 m. Under the transition water depth, the construction cost of the traditional pile type foundation is obviously increased, the floating type foundation is more expensive in manufacturing cost, and relatively speaking, the truss type jacket foundation is safe and stable in structure, economical in manufacturing cost and more competitive.

The wind power jacket foundation structure is a foundation form which is widely applied to offshore wind power at present, is suitable for large-scale fans and various water depths and even deep sea fields, and is applied to an offshore oil and gas platform with insignificant dynamic response in early stage. The foundation of the offshore wind power structure not only bears hydrodynamic load during operation, but also can bear the long-term action of the aerodynamic load, and the pipe joint in the structure foundation always has complex alternating stress in the service process. Therefore, the ultimate strength and fatigue strength of the pipe joints are the primary control criteria in jacket infrastructure design.

The steel pipe concrete structure is formed by filling concrete in steel pipes, and has been applied to large-scale infrastructures such as super high-rise buildings, subway stations, bridges, and the like. The steel pipe concrete structure can effectively improve the bearing capacity performance of the traditional steel structure and the fatigue performance of the traditional steel structure against cyclic reciprocating load, but the application of the steel pipe concrete structure in offshore wind power foundation is not available at present.

SUMMERY OF THE UTILITY MODEL

Aiming at the defects in the prior art, the utility model aims to provide a high-strength grouting pipe joint jacket foundation for offshore wind power. The utility model fully exerts the characteristics of high durability, fatigue resistance and strong bearing capacity of the steel pipe joint filled with grouting material, and provides a novel and reliable technical means for offshore wind power resource development in medium-water depth and even deep sea water areas.

On one hand, the utility model provides an offshore jacket wind power foundation with high-strength grouting pipe nodes, which comprises a fan bottom section tower frame, a platform transition section, a jacket main body and steel pipe piles which are fixedly connected from top to bottom in sequence, wherein a plurality of supporting structures are arranged at intervals in the height direction of the jacket main body, and each supporting structure comprises a jacket main leg, a jacket diagonal brace and a jacket cross brace which are fixedly connected through a plurality of pipe nodes.

The main leg of the jacket is of a steel structure and is a main supporting structure of the wind power foundation of the jacket. And the main legs of the jacket are connected with the top of the steel pipe pile at the seabed in a grouting manner, and the wind power foundation of the jacket is fixed on the seabed.

The jacket diagonal bracing is of a steel structure and is a secondary supporting structure of a jacket wind power foundation. The jacket diagonal brace connects the jacket main legs together, so that the lateral resistance of the structural foundation is improved, the lateral rigidity and the integrity of the whole foundation are improved, the jacket diagonal brace is a main force transmission component of the whole foundation, and the stress distribution uniformity of the whole foundation in resisting environmental loads is ensured.

The jacket cross brace is of a steel structure and is a secondary supporting structure of a jacket wind power foundation. The jacket cross brace connects the jacket main legs together, and the jacket cross brace divides the whole jacket foundation into a plurality of platform sections, so that the main legs are prevented from being overlong and being subjected to pressure instability.

The platform transition section is of a steel structure and is used for connection transition between a jacket foundation and a fan bottom tower, a platform at the transition section can be used for arranging auxiliary equipment of a wind turbine structure and can also be used as a landing and operating platform for maintenance personnel in later operation and maintenance, the maintenance personnel can directly enter the tower of the fan from the platform transition section, and the arrangement of a fan outer platform is omitted.

In each supporting structure, the intersections of every two jacket main legs, two jacket diagonal braces and two jacket cross braces are connected through a K-K type pipe joint. The K-K type pipe joint is the intersection of the two jacket main legs, the two jacket diagonal braces and the two jacket cross braces and is in a K-K type. The K-K type pipe node is an area with most obvious stress concentration in the whole structure foundation, is a position needing key check in the structure strength design, and is a main bearing component in the structure foundation. The K-K type pipe joint is externally provided with a thin-wall steel pipe, high-strength slurry is filled in the K-K type pipe joint, and a filling boundary is covered with a sealing spacer.

The sealing and separating piece is a steel sheet-shaped component, on one hand, the sealing and separating piece is used as a filling boundary of grouting material in a pipe joint, and the grouting material is densely packaged in the pipe joint; on the other hand, the packing sheet improves the anti-impact shear capability of the structure, reduces the thickness and the length of the thick-wall section required by the node, and reduces the stress concentration at the node of the pipe.

In the utility model, the intersection of every two jacket main legs and two jacket diagonal braces in each supporting structure is connected through a Y-Y type pipe node. Similar to the K-K type pipe node, the Y-Y type pipe node is provided with a thin-wall steel pipe at the outer part, high-strength slurry is filled in the Y-Y type pipe node, and a filling boundary is covered with a sealing spacer.

The packing spacers arranged in the K-K type pipe node and the Y-Y type pipe node are positioned at the tail ends of the thick-wall sections of the branch pipes and the main pipe of the pipe node, so that the grouting material filling range of the concrete filled steel pipe node is within the thick-wall sections of the pipe node. It should be noted that although the welding seam of the packing piece is added at the pipe joint, the position of the welding seam is the welding position where the pipe joint is connected with the cross brace, the inclined brace and the main leg, and therefore no additional welding seam is added.

On the other hand, the utility model also provides a construction method of the offshore jacket wind power foundation of the high-strength grouting pipe joint, which comprises the following steps:

the offshore jacket wind power foundation construction method of the high-strength grouting pipe node is characterized by building a prefabricated steel structure in a foundation, installing a jacket structure after pile sinking on site, and finally filling grouting material to enhance the strength of the jacket wind power foundation structure node. The concrete construction steps are divided into three major parts, namely 1, land construction, 2, offshore pile sinking and installation, and 3, filling of grouting material reinforced nodes.

1. The land construction adopts a mode of assembly and pairing after sectional construction, the vacant working face in the construction site is fully utilized, and the platform transition section, the jacket diagonal brace, the jacket main leg, the jacket cross brace, the jacket K-K type pipe node, the X type pipe node, the Y-Y type pipe node and the steel pipe pile are respectively constructed according to the sequence of blanking, rolling, welding, rounding and pairing. During final assembly, construction is carried out on two slideways of the construction base in a mode of horizontal final assembly of the jacket. The concrete construction steps are as follows:

(1) and respectively hoisting the two groups of jacket main legs, the jacket K-K type pipe joints and the Y-Y type pipe joints to two slideways of a construction base, and then carrying out assembly and welding.

(2) And carrying out general assembly and butt welding on the bottom surface structure of the jacket between the two slideways by using a group of jacket diagonal braces, jacket cross braces and X-shaped pipe joints.

(3) 2 groups of jacket diagonal braces, jacket cross braces and X-shaped pipe joints are respectively hoisted by a crawler crane to carry out jacket vertical surface structure assembly and welding.

(4) And respectively hoisting the other two groups of jacket main legs, jacket K-K type pipe joints and Y-Y type pipe joints to the jacket vertical surface structure to complete assembly welding.

(5) And carrying out general assembly and butt welding on the top surface structure of the jacket on the nodes of the rest group of jacket inclined struts, jacket cross struts and X-shaped pipes.

(6) And welding the platform transition section and the finally assembled jacket structure into a whole to finish the land construction step.

2. The offshore launching installation can adopt hoisting or sliding launching according to the actual working water depth, and pile sinking adopts a pile-first method; when the offshore jacket wind power foundation ship loading mode adopts horizontal sliding ship loading, the offshore jacket wind power foundation and 4 steel pipe piles are transported to the machine site in a barge dry-towing mode, and the method comprises the following specific steps:

(1) and (4) pile sinking of the 4 steel pipe piles is performed, the actual pile sinking precision is measured after pile sinking is completed, and jacket foundation installation construction operation can be performed after the jacket foundation precision requirement is met.

(2) And hoisting and pile inserting operation of the jacket foundation are carried out. The offshore jacket wind power foundation installation method can select two installation methods according to factors such as offshore wind plant marine environmental conditions, jacket wind power foundation size and weight and the like. When the water depth of an offshore wind power plant is shallow, the jacket wind power foundation can be installed in a hoisting mode under the condition that the size and the weight of the jacket wind power foundation can meet the hoisting limit of a floating crane ship. The main floating type crane ship lifts the top side of the wind power foundation of the jacket, the auxiliary floating type crane ship performs tail sliding lifting matching, the main floating type crane ship gradually increases lifting force to lift the top side of the wind power foundation of the jacket, and the auxiliary crane ship gradually reduces lifting force, so that the wind power foundation of the jacket gradually forms a posture in a position state until a completely upright state. When four main legs of the jacket wind power foundation are installed in place, one inserting tip is installed firstly, and then the inserting tips of the other three main legs are installed by taking the main leg as a positioning point. When the water depth of the offshore wind power plant is deeper, the jacket wind power foundation can be glidingly launched and installed in an underwater righting mode under the condition that the size and the weight of the jacket wind power foundation exceed the hoisting limit of the floating crane ship. After the barge is inserted into the parking site, the jacket wind power foundation is gradually slid towards the stern, and the ballast of the barge is gradually adjusted in the process, so that the stern draft is larger than the bow draft. After the jacket wind power foundation is launched, the jacket is righted in water by using a floating crane ship, and the four main legs of the jacket wind power foundation are installed in place.

3. And grouting operation, namely performing grouting operation on the pipe joint of the jacket and grouting operation on the foundation of the jacket and the steel pipe pile. When grouting, the main grouting line is used firstly, and if pipe blockage is found, the standby grouting line is started. The high-strength grouting material firstly fills a gap between the jacket inserting tip and the steel pipe pile along the grouting pipeline. And then sequentially filling Y-Y type pipe nodes and K-K type pipe nodes with the grouting material from the bottom layer to the top layer along with the progress of grouting until all the Y-Y type pipe nodes and all the K-K type pipe nodes are fully filled with the grouting material. The grouting needs to be pumped once and the construction of pumping and grouting can be finished until the grout overflows.

Compared with the prior art, the utility model has the following advantages and beneficial effects:

1) the grouting technology is combined with the jacket pipe joint, and the high-strength grouting design of the K-K type pipe joint and the Y-Y type steel pipe joint is beneficial to enlarging the compression resistance of the grouting material and the tensile resistance of a steel pipe structure, enhancing the lateral resistance and the bearing capacity of the pipe joint and improving the ultimate strength of the structure.

2) The high-strength grouting design of the K-K type pipe node and the Y-Y type pipe node enhances the cyclic load resistance of the pipe node, obviously improves the fatigue performance of the pipe node, and solves the fatigue design difficulty of the pipe node in the current engineering.

3) The grouting design of the K-K type pipe node and the Y-Y type pipe node can effectively reduce the length and the thickness of the thick-wall section of the node required by the design, reduce the steel consumption and improve the economic benefit.

4) The design of the packing pieces in the K-K type pipe node and the Y-Y type pipe node can enhance the connection strength of the grouting material and the steel pipe, plays a role similar to an anti-impact shear ring, can effectively improve the anti-impact shear capability of the structure, reduces the stress concentration of the pipe node, and reduces the steel consumption of the pipe node.

5) The grouting of the pipe joints is completed at sea, and no extra weight is added for hauling and hoisting the jacket.

6) Pipe node slip casting can use same equipment and pipeline with the stake grout, need not additionally be equipped with concrete mixing ship, does not have extra increase in cost.

Drawings

FIG. 1 is a front view of one embodiment of the present invention;

fig. 2 is a schematic view of a tube node grout tube and a stake-inserted grout tube of the present invention.

Reference numerals: 1-a fan bottom tower section; 2-a platform transition section; 3-jacket diagonal bracing; 4-jacket main leg; 5-jacket cross bracing; 6-K-K type pipe nodes; 7-X type pipe node; 8-Y-Y type tube node; 9-steel pipe pile.

Detailed Description

In order that those skilled in the art will better understand the technical solutions of the present invention, the following description of the preferred embodiments of the present invention is provided in conjunction with specific examples, but it should be understood that the drawings are for illustrative purposes only and should not be construed as limiting the patent; for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted. The positional relationships depicted in the drawings are for illustrative purposes only and are not to be construed as limiting the present patent.

As shown in fig. 1, the embodiment provides a high-strength grouting pipe node jacket foundation for offshore wind power, which mainly includes a fan bottom joint tower frame 1, a platform transition section 2, a jacket main body, and a steel pipe pile 9, which are sequentially arranged from top to bottom, wherein a plurality of support structures are arranged at intervals in the height direction of the jacket main body, and each support structure includes a jacket main leg 4, a jacket diagonal brace 3, and a jacket cross brace 5, which are fixedly connected through a plurality of pipe nodes; the pipe nodes comprise a K-K type pipe node 6, an X type pipe node 7 and a Y-Y type pipe node 8.

The fan bottom section tower frame 1, the platform transition section 2, the jacket diagonal brace 3, the jacket main leg 4, the jacket cross brace 5, the pipe joint and the steel pipe pile 9 are all of steel structures.

As shown in fig. 1, the bottom ends of the main legs 4 of the jacket are connected with the steel pipe piles 9 in a grouting manner, so that the base of the jacket is fixed on the seabed, and the bearing capacity and the lateral resistance are provided for the foundation structure. Wherein, the steel pipe pile 9 is positioned below the mud surface, and the length thereof depends on the specific environmental factors at the position of the fan.

As shown in fig. 1, the K-K type pipe node 6, the X type pipe node 7, and the Y-Y type pipe node 8 are all intersecting nodes of a plurality of steel pipes, and in order to ensure structural ultimate strength and fatigue strength of the steel pipes under stress concentration, thick wall sections are arranged at the pipe nodes.

In the actual construction process, the mode of sectional construction and integral welding is adopted for the jacket wind power foundation. The X-type pipe joint 7, the K-type pipe joint 6 and the Y-type pipe joint 8 are manufactured in advance, welded with the jacket inclined strut 3, the jacket main leg 4 and the jacket cross strut 5 to form a jacket, and finally spliced with the fan bottom section tower frame 1 and the platform transition section 2.

As shown in FIG. 1, the K-K type pipe joint 6 and the Y-Y type pipe joint 8 are manufactured by firstly completing the manufacture of the steel pipe joint, and then welding a sealing spacer on the end face of a branch pipe and the end face of a main pipe to be used as the boundary for filling concrete subsequently.

The steel pipe pile 9 is generally formed by rolling a steel plate with unequal thickness in a straight seam mode and welding the steel plate by automatic arc filling welding. In actual engineering, the jacket foundation can be installed by adopting a pile-first method. The steel pipe pile 9 in the pile-first method is to finish pile sinking operation at an installation site in advance, then the manufactured jacket foundation is dragged to the installation site from a dock through a barge, a main pipe of the jacket foundation penetrates through a pile shoe to be connected with the steel pipe pile through the lifting of a crane, and then grouting is carried out to finish installation. The grouting material for connecting the jacket and the steel pipe pile can fully fill the gap between the sleeve and the pile, and when water exists in the gap, the grouting material can replace seawater and needs to have reliable strength of stress transmission.

As shown in fig. 2, a set of pipeline is used for grouting at the pipe joints of the jacket and the steel pipe piles, high-strength slurry used for grouting and grouting is stored on an installation ship in advance, and after the initial hoisting, pile inserting and leveling of the jacket at the designated machine site are completed, the high-strength slurry is pumped to the pipe joints and the steel pipe piles through the pipeline shown in fig. 2, so that grouting operation and grouting operation are completed.

According to the description and the drawings of the utility model, a high-strength grouting pipe joint jacket foundation for offshore wind power can be easily manufactured or used by a person skilled in the art, and the positive effects recorded by the utility model can be generated.

Unless otherwise specified, in the present invention, if there is an orientation or positional relationship indicated by terms of "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., based on the orientation or positional relationship shown in the drawings, it is only for convenience of describing the present invention and simplifying the description, rather than to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore, the terms describing orientation or positional relationship in the present invention are for illustrative purposes only, and should not be construed as limiting the present patent, specific meanings of the above terms can be understood by those of ordinary skill in the art in light of the specific circumstances in conjunction with the accompanying drawings.

Unless expressly stated or limited otherwise, the terms "disposed," "connected," and "connected" are used broadly and encompass, for example, being fixedly connected, detachably connected, or integrally connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications and equivalent variations of the above embodiments according to the technical spirit of the present invention are included in the scope of the present invention.

Claims (9)

1. The utility model provides a high-strength slip casting pipe node jacket basis for offshore wind power which characterized in that: including fan bottom segment pylon, platform changeover portion, jacket main part and the steel-pipe pile of from top to bottom fixed connection in proper order, interval arrangement has a plurality of bearing structures on the direction of height of jacket main part, just every bearing structure includes jacket main leg, jacket bracing and jacket stull through a plurality of tube node fixed connection.

2. The high-strength grouting pipe joint jacket foundation for offshore wind power as claimed in claim 1, wherein: and the intersections of every two jacket main legs, two jacket diagonal braces and two jacket cross braces in each supporting structure are connected through a K-K type pipe joint.

3. The high-strength grouting pipe joint jacket foundation for offshore wind power as claimed in claim 2, wherein: the K-K type pipe joint is filled with concrete compactly, and a sealing spacer is covered on the concrete filling boundary.

4. The high-strength grouting pipe joint jacket foundation for offshore wind power as claimed in claim 2, wherein: and the intersection of every two jacket main legs in each supporting structure and two jacket inclined struts is connected through a Y-Y type pipe node.

5. The high-strength grouting pipe joint jacket foundation for offshore wind power as claimed in claim 4, wherein: the interior of the Y-Y type pipe joint is densely filled with concrete, and a sealing spacer is covered on the concrete filling boundary.

6. The high-strength grouting pipe joint jacket foundation for offshore wind power as claimed in claim 1, wherein: the intersection of every two jacket diagonal braces in each supporting structure is connected through an X-shaped pipe node.

7. The high-strength grouting pipe joint jacket foundation for offshore wind power as claimed in claim 6, wherein: the pipe wall thickness of the X-shaped pipe node is larger than that of the jacket diagonal brace.

8. The high-strength grouting pipe joint jacket foundation for offshore wind power as claimed in claim 4, wherein: and the outer parts of the K-K type pipe node and the Y-Y type pipe node are thin-wall steel pipes.

9. The high-strength grouting pipe joint jacket foundation for offshore wind power as claimed in claim 5, wherein: the sealing and separating sheet is a steel sheet-shaped member.

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