An internally inserted offshore wind power conductor frame foundation with self-contained pile stabilizing casing and construction method

Abstract

The present invention discloses an internal plug-in offshore wind power conductor frame foundation with self-contained pile stabilizing sleeves and a construction method. The whole scheme is mainly composed of a conductor frame body, a plurality of pile stabilizing sleeves and a plurality of legs, wherein the plurality of legs are vertically arranged at the bottom end of the conductor frame body, and the plurality of pile stabilizing sleeves are arranged on the conductor frame body and are on the same circumference as the plurality of legs. The offshore wind power deepwater conductor frame foundation scheme provided by the present invention adopts an internal plug-in type to ensure the reliability of the conductor frame foundation, and at the same time, it has its own pile stabilizing sleeves and innovatively adopts the post-pile method for construction to ensure the accuracy of steel pipe pile sinking and reduce the construction difficulty and construction cost.

Description

Technical Field

[0001] The present invention relates to offshore wind farm technology, and in particular to offshore wind power pipe frame technology. Background Art

[0002] In the context of increasingly severe situations such as energy conservation and emission reduction, climate change response, energy shortages, and energy supply security, offshore wind resources, as a green energy, have the advantages of stable wind resources and easy large-scale development, and are currently being used on a large scale in my country.

[0003] At present, all the offshore wind farms built in China are near-shore wind farms, where the water depth is generally less than 10m, and their supporting structures are mainly high-pile foundations and single-pile foundations. With the development of offshore wind farms, the distance from the shore and the water depth of the wind farms are increasing, and the traditional offshore foundation structure type can no longer meet the requirements of deep-sea wind energy development. In waters with a water depth of about 30m, the jacket foundation has a relatively good economic advantage.

[0004] There are two types of commonly used jacket foundations: internal and external. Figure 1 As shown, the structural feature of the inserted jacket is that the lower leg of the jacket foundation 11 is inserted and seated on the top of the steel pipe pile 12, and the annular space between the leg and the steel pipe pile is filled by grouting; Figure 2 As shown, the outer jacket type jacket has a structural feature that the steel pipe pile 12 is inserted into the casing at the lower part of the jacket 11, and the casing and the steel pipe pile are connected by grouting.

[0005] Among them, the inner-insert jacket foundation is different from the outer-jacket jacket foundation in that the load of the inner-insert jacket foundation is directly transferred to the top of the steel pipe pile through the lower legs of the jacket, and then transferred to the foundation soil by the steel pipe pile. The grouting between the legs and the steel pipe pile only plays a fixing role. The load of the outer-jacket jacket foundation is transferred to the grouting between the jacket and the steel pipe pile through the lower jacket of the jacket, and then transferred to the steel pipe pile by the grouting, and then transferred to the foundation soil by the steel pipe pile. The grouting between the jacket and the steel pipe pile not only plays a fixing role, but also transfers more load to the jacket.

[0006] Therefore, within the 25-year life cycle of offshore wind power, the reliability of the grouting of the jacket-type jacket largely determines the effectiveness of the foundation. Therefore, the reliability of the insert-type jacket foundation is greater than that of the jacket-type jacket foundation.

[0007] In addition, compared with the outer jacket type jacket foundation, the construction process of the two is also different. The inner jacket type jacket foundation adopts the first pile method, that is, firstly sinking steel pipe piles underwater on the seabed, and then inserting the jacket; while the outer jacket type jacket adopts the post pile method, that is, placing the jacket foundation on the seabed first, and then inserting the steel pipe piles into the outer jacket for pile sinking operation.

[0008] Among them, the inserted jacket foundation adopts underwater piles during construction. Therefore, engineering measures must be adopted to ensure the relative position accuracy of the underwater steel pipe piles. The construction is difficult and costly. Summary of the invention

[0009] Aiming at the problems existing in the jacket foundation scheme adopted in the existing offshore wind farms, a new jacket foundation scheme for offshore wind farms is needed.

[0010] To this end, the purpose of the present invention is to provide an internally inserted offshore wind power conductor frame foundation with a pile stabilizing sleeve, and to provide a construction method for the conductor frame foundation, thereby ensuring the reliability of the conductor frame foundation and reducing the difficulty of construction.

[0011] In order to achieve the above-mentioned purpose, the present invention provides an inserted offshore wind power conductor frame foundation with a pile stabilizing sleeve, which includes a conductor frame body, a plurality of pile stabilizing sleeves and a plurality of legs, wherein the plurality of legs are vertically arranged at the bottom end of the conductor frame body, and the plurality of pile stabilizing sleeves are placed on the conductor frame body and are on the same circumference as the plurality of legs.

[0012] Furthermore, the conductor frame body is a steel truss structure.

[0013] Furthermore, the conductor frame body includes a plurality of steel support tubes, a plurality of diagonal support tubes, a plurality of transition connection sections, and a plurality of anti-sinking plates; the plurality of steel support tubes are distributed centrally symmetrically, and two adjacent steel support tubes are connected by multiple layers of crossed diagonal support tubes; the plurality of transition connection sections are correspondingly arranged above the plurality of steel support tubes, and the plurality of anti-sinking plates are correspondingly arranged at the corners of the conductor frame body.

[0014] Furthermore, the upper portion of the pile stabilizing casing is an inverted bell-mouth structure, and the lower portion is a centrally controlled cylindrical structure.

[0015] Furthermore, the pile stabilizing sleeve is fixedly connected to the conductor frame body via a connecting plate with ribs.

[0016] Furthermore, a pile guide plate is provided at the front end of the supporting leg.

[0017] In order to achieve the above-mentioned purpose, the present invention provides an inserted offshore wind power conductor frame construction method with a pile stabilizing sleeve. The construction method shown is firstly to pass the steel pipe pile through the pile stabilizing sleeve on the conductor frame body and sink the pile to the designed elevation, then lift the conductor frame body, and insert the support legs on the conductor frame body into the open steel pipe piles for fixing.

[0018] Furthermore, the construction method comprises:

[0019] The jacket body is directly lowered to the mud surface at the construction site, and the jacket is stabilized by its own weight;

[0020] Lift the steel pipe pile and insert it into the pile stabilizing casing on the jacket body. After the steel pipe pile enters the mud by its own weight, sink it underwater to the designed elevation.

[0021] Lift the jacket body, insert the legs on the jacket body into the corresponding steel pipe piles, and lower the jacket body so that the jacket body is seated on the open steel pipe piles;

[0022] Carry out grouting work in the annular space between the steel pipe pile and the support leg.

[0023] The offshore wind power deepwater jacket foundation solution provided by the present invention adopts an insert type to ensure the reliability of the jacket foundation. At the same time, it has its own pile stabilizing casing and innovatively adopts the post-pile construction method to ensure the accuracy of steel pipe pile sinking and reduce the construction difficulty and construction cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0025] Figure 1 It is a structural schematic diagram of an existing internal insertion type catheter rack;

[0026] Figure 2 It is a structural schematic diagram of an existing jacket-type conductor frame;

[0027] Figure 3 It is a structural schematic diagram of an in-line offshore wind power conductor frame foundation in an example of the present invention;

[0028] Figure 4 It is a structural schematic diagram of the jacket body in an example of the present invention;

[0029] Figure 5 It is a schematic diagram of the structure of the supporting legs in an example of the present invention;

[0030] Figure 6 It is a structural schematic diagram of a pile stabilizing casing in an example of the present invention;

[0031] Figure 7 It is a schematic diagram of the distribution of the pile stabilizing casing and the supporting legs in an example of the present invention;

[0032] Figure 8 This is a diagram showing the on-site hoisting state of the jacket body during construction of an example of the present invention;

[0033] Fig. 9 This is a diagram of the self-stabilizing state of the jacket body entering the mud during construction of an example of the present invention;

[0034] Fig.10 A schematic diagram of the pile sinking operation of an open steel pipe pile during construction of an example of the present invention;

[0035] Fig.11 This is a diagram showing the lifting and alignment status of the jacket body during construction of an example of the present invention;

[0036] Fig.12 This is a diagram showing the state of the jacket body being seated on the open steel pipe piles during construction of an example of the present invention. DETAILED DESCRIPTION

[0037] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below with reference to specific diagrams.

[0038] In view of the defects in the structure and construction scheme of the existing internally inserted jacket or externally inserted jacket, this example designs an internally inserted offshore wind power deepwater jacket foundation with a built-in pile stabilizing casing. The reliability of the entire jacket foundation is ensured by the internally inserted connection structure. At the same time, the post-pile method construction is realized based on the built-in pile stabilizing casing to ensure the accuracy of steel pipe pile sinking, which greatly reduces the construction difficulty and construction cost.

[0039] See also Figure 3 , which shows an example of an inserted offshore wind power deepwater jacket foundation with its own pile stabilizing casing given in this example.

[0040] As can be seen from the figure, the internally inserted offshore wind power deepwater jacket foundation 100 with its own pile stabilizing sleeve is mainly composed of a jacket body 110, a plurality of pile stabilizing sleeves 120, a plurality of legs 130, and a plurality of open steel pipe piles 140 that cooperate with each other.

[0041] See also Figure 4 The jacket body 110 constitutes the main part of the jacket foundation 100, and the jacket body 110 adopts a steel truss structure and is in the shape of a quadrangular pyramid. The jacket body 110 is mainly composed of four obliquely arranged steel support pipes 111, three layers of oblique support pipes 112, a plurality of transition connection sections 113, a plurality of anti-sinking plates 114 and a platform 115.

[0042] Among them, the steel support pipes 111 are the four main support pipes of the conductor frame body, which bear and transmit the main load. The four steel support pipes are obliquely arranged in four directions and are centrally symmetrical when viewed from above.

[0043] In addition, the steel support pipe 111 can be reduced in diameter as required to improve strength and ease of assembly.

[0044] The three-layer diagonal bracing tube 112 connects two adjacent steel support tubes 111. Each layer of the diagonal bracing tube is composed of two crossed steel tubes. The axes of the three-layer diagonal bracing tube 112 are located on the plane where the axes of the two adjacent steel support tubes 111 are located. The three-layer diagonal bracing tube 112 is arranged on the four sides of the steel support tube 111 respectively, and connected to form a whole.

[0045] In addition, the diagonal brace pipes 112 in this example are not limited to the three-layer structure shown in the figure, and the number of layers is determined according to the actual water depth and load conditions, and transverse horizontal brace pipes can be added when necessary. The transverse horizontal brace pipes can be arranged at the top, bottom and intersection of each adjacent layer of diagonal brace pipes 112, and the central axis thereof is located in the same plane as the diagonal brace pipes 112, which can increase the strength and stability of the jacket body structure.

[0046] The transition section 113 is a connection section that transitions from the steel truss structure of the jacket foundation to the wind turbine tower or other structural forms. The wind turbine can be installed on the upper part and connected to the wind turbine bottom tower by bolts, and the lower part is connected to the platform 115.

[0047] In addition, the external transition connection section 113 can be designed into a transition section tower form or other transition section forms according to actual functional requirements, so as to facilitate the installation of a wind turbine or a wind measurement tower.

[0048] The anti-sinking plates 114 are arranged at the four corners of the jacket respectively, and their areas are determined according to the geological bearing capacity of the seabed and the weight of the jacket to ensure that the jacket does not sink too deep into the mud due to its own weight.

[0049] The platform 115 is arranged on the top of the conductor frame body 110 and can be used as a construction platform to bear the construction load when the wind turbine or the wind tower is installed. After the installation is completed, it can be used as a platform for placing instruments and equipment. It is arranged according to actual needs.

[0050] The pipe frame body 110 thus constructed has a stable and reliable structure and can be well used for installing a wind measurement tower or a wind turbine.

[0051] The jacket foundation 100 is based on the structure of the jacket body 110 and adopts four legs 130 , and the four legs 130 are vertically fixedly arranged at the four corners of the bottom of the jacket body 110 to support the jacket body 110 and complete the installation and assembly with the open steel pipe piles 140 .

[0052] See also Figure 5 The leg 130 in this example mainly includes an open steel pipe 131 as a main body and a guide plate 132 with a pile insertion arranged on the top of the open steel pipe 131. As an example, the guide plate 132 with a pile insertion is preferably formed by two horseshoe-shaped plates vertically intersecting and welding, with a pointed bottom to facilitate the insertion of steel pipe piles. The leg 130 formed in this way can be inserted into the open steel pipe pile 140 very conveniently based on the guide plate 132 at the front end.

[0053] In addition, the support leg 130 may also be made of other types of steel pipes as required.

[0054] In the jacket foundation 100 , based on the structure of the jacket body 110 , four pile stabilizing sleeves 120 are used to complete the precise pile sinking operation of the open steel pipe piles 140 .

[0055] So, see Figure 7 The four pile stabilizing sleeves 120 are respectively arranged on the jacket body 110 corresponding to the four supporting legs 130 and are located at the bottom ends of the four steel support pipes 111. The four pile stabilizing sleeves 120 and the four supporting legs 130 are on the same plane circumference. After the positioning and piling are completed by using the pile stabilizing sleeves 120, it is only necessary to vertically lift the jacket body 110 and rotate it a certain angle to insert it into the open steel pipe pile 140, which greatly reduces the construction difficulty.

[0056] See also Figure 6 The pile stabilizing sleeve 120 in this example is mainly composed of an inverted trumpet structure at the upper part and a hollow cylindrical structure at the lower part. In the pile stabilizing sleeve 120 with such a structure, the hollow cylindrical lower part and the jacket body 110 can be fixedly connected by welding a connecting plate with ribs, or other fixed or detachable connection methods can be used.

[0057] The open steel pipe pile 140 in the jacket foundation 100 is a load-bearing member, which is accurately sunk through the pile stabilizing sleeve 120 arranged on the jacket body 110, so that the lower end is sunk to the bearing layer below the seabed, and the upper end is about 3-5 meters above the seabed surface. The diameter, wall thickness and length of each open steel pipe foundation pile can be determined according to the wind, wave, current conditions and soil conditions of the actual sea area, and cooperates with the support leg 130 to allow the support leg 130 to be inserted therein.

[0058] The overall structure of the jacket foundation 100 formed based on the above solution is an inserted structure. During the specific construction, the post-pile method can be used based on the pile stabilizing casing provided thereon, which not only ensures the accuracy of steel pipe pile sinking, but also greatly reduces the construction difficulty and construction cost.

[0059] The following describes the process of post-pile construction of the jacket foundation 100 in this example.

[0060] Before the specific construction, the components of the jacket foundation 100: the jacket body 110, a plurality of pile stabilizing sleeves 120, a plurality of legs 130, and a plurality of open steel pipe piles 140 are manufactured in a corresponding processing plant through steel plate rolling, welding and other processes, and the pile stabilizing sleeves 120 and the legs 130 are correspondingly placed on the jacket body 110.

[0061] The jacket body 110 and the open steel pipe piles 140 connected as a whole are transported to an offshore construction site by a special construction vessel.

[0062] After the above preparations are completed, the construction of the jacket foundation 100 will be prepared.

[0063] First, at the offshore construction site, the jacket body 110 (such as the jacket body 110 with the pile casing 120 and the legs 130) is hoisted and installed by a special crane ship. Figure 8 As shown), the jacket body 110 is directly suspended to the mud surface, and the jacket body 110 is directly supported by the four legs 130 at the bottom (as shown). Fig. 9 In addition, the mud should be placed when the tidal flow rate is low to reduce the impact of the water flow.

[0064] Next, the open steel pipe pile 140 is lifted by a special crane ship and inserted into the pile stabilizing sleeve 120 on the jacket body 110. After the open steel pipe pile 140 enters the mud based on its own weight, it is sunk underwater to the designed elevation by a hydraulic impact hammer or a hydraulic vibration hammer. According to the pile stabilizing sleeve 120 set on the jacket body 110, all the open steel pipe piles 140 are sunk underwater in sequence (such as Fig.10 As shown). During the entire process of sinking the open steel pipe pile, the pile stabilizing sleeve 120 provides good support and guidance for the open steel pipe pile, ensuring the stability and reliability of the entire pile sinking; at the same time, the relative positional relationship between the various pile stabilizing sleeves 120 is fixed, so that the relative positional relationship between each open steel pipe pile 140 after the pile sinking is fixed, ensuring the construction plane accuracy of the inserted open steel pipe pile 140; at the same time, since the pile stabilizing sleeve 120 and the support leg 130 on the jacket body 110 are on the same plane circumference, the several open steel pipe piles 140 and the support legs 130 that are sunk based on the pile stabilizing sleeve 120 are also on the same plane circumference, thereby ensuring the convenience of the subsequent jacket body 110 to align and insert the open steel pipe pile 140 through the support legs 130 thereon.

[0065] Next, the jacket body 120 is lifted by a special lifting vessel, so that the jacket body 120 is separated upward from the open steel pipe pile 140 (ie, the pile stabilizing sleeve 120 thereon is separated from the open steel pipe pile 140) (eg, Fig.11 shown).

[0066] Next, the special crane vessel is moved and rotated so that the legs 130 on the jacket body 120 correspond to the open steel pipe piles 140 respectively, and the legs 130 are inserted into the open steel pipe piles 140 respectively, and the jacket body 110 is lowered so that the jacket body 110 is seated on the open steel pipe piles 140 as a whole (such as Fig.12 shown).

[0067] Finally, the annular space between the open steel pipe pile 140 and the support leg 130 is grouted.

[0068] Thus, the construction of offshore wind power deepwater conductor frame is completed, and the subsequent installation of wind measurement tower or wind turbine can be carried out directly.

[0069] The inserted offshore wind power deepwater jacket foundation form with its own pile stabilizing casing retains the advantage of high reliability of the inserted offshore wind power deepwater jacket, and at the same time comes with its own pile stabilizing casing, which facilitates the construction control of the plane precision control of the steel pipe pile underwater sinking piles, reduces the construction cost, can be applied to deepwater environment, has high reliability, convenient construction precision control and low construction cost.

[0070] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. An internally inserted offshore wind power conduit foundation with a self-contained pile stabilizing casing, characterized in that: It includes a jacket body, a plurality of pile stabilizing sleeves and a plurality of legs, wherein the plurality of legs are vertically arranged at the bottom end of the jacket body, the plurality of pile stabilizing sleeves are arranged on the jacket body and are on the same circumference as the plurality of legs, the upper part of the pile stabilizing sleeve is an inverted bell mouth structure, and the lower part is a centrally controlled cylindrical structure, and the pile stabilizing sleeve is fixedly connected to the jacket body through a connecting plate with ribbed plates; The insert-type offshore wind power conductor frame foundation is configured as follows: first, the conductor frame body is directly lowered to the mud surface, and the self-stabilization operation of entering the mud is completed directly by its own weight; then, the open steel pipe piles are inserted into the pile stabilizing sleeves on the conductor frame body, and the piles are sunk to the designed elevation; according to the plurality of pile stabilizing sleeves provided on the conductor frame body, the underwater pile sinking operation of all the open steel pipe piles is completed in sequence, and the plurality of open steel pipe piles that have completed the sinking are located in the same plane circumference; then, the conductor frame body is lifted, so that the conductor frame body is directly upward so that the plurality of pile stabilizing sleeves thereon are simultaneously detached from the plurality of open steel pipe piles that have completed the sinking, and the legs on the conductor frame body are inserted into the open steel pipe piles for fixing.

2. The plug-in offshore wind power conduit foundation according to claim 1 is characterized in that: The conductor frame body is a steel truss structure.

3. The plug-in offshore wind power conduit foundation according to claim 1, characterized in that: The conductor frame body includes a plurality of steel support tubes, a plurality of diagonal support tubes, a plurality of transition connection sections, and a plurality of anti-sinking plates; the plurality of steel support tubes are distributed centrally symmetrically, and two adjacent steel support tubes are connected by multiple layers of crossed diagonal support tubes; the plurality of transition connection sections are correspondingly arranged above the plurality of steel support tubes, and the plurality of anti-sinking plates are correspondingly arranged at the corners of the conductor frame body.

4. The plug-in offshore wind power conduit foundation according to claim 1, characterized in that: A pile guide plate is arranged at the front end of the supporting leg.

5. A method for constructing an internally inserted offshore wind power conduit frame, characterized in that: The construction method is based on the inserted offshore wind turbine conduit foundation with a pile stabilizing sleeve as described in any one of claims 1 to 4. First, the steel pipe piles are passed through the pile stabilizing sleeves on the conduit body and sunk to the designed elevation. Then, the conduit body is lifted and the legs on the conduit body are inserted into the open steel pipe piles for fixation.

6. The method for constructing an internally inserted offshore wind power conduit according to claim 5, characterized in that: The construction method comprises: The jacket body is directly lowered to the mud surface at the construction site, and the jacket is stabilized by its own weight; Lift the steel pipe pile and insert it into the pile stabilizing casing on the jacket body. After the steel pipe pile enters the mud by its own weight, sink it underwater to the designed elevation. Lift the jacket body, insert the legs on the jacket body into the corresponding steel pipe piles, and lower the jacket body so that the jacket body is seated on the open steel pipe piles; Carry out grouting work in the annular space between the steel pipe pile and the support leg.

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