CN112502908A

CN112502908A - Connecting node suitable for offshore wind power tower cylinder structure and installation method

Info

Publication number: CN112502908A
Application number: CN202011315497.8A
Authority: CN
Inventors: 柯珂; 王俊人; 周绪红; 王宇航; 贺拥军
Original assignee: Chongqing University
Current assignee: Chongqing University
Priority date: 2020-11-21
Filing date: 2020-11-21
Publication date: 2021-03-16

Abstract

The invention discloses a connecting node suitable for an offshore wind power tower cylinder structure and an assembling method. The upper node and the lower node both comprise barrel sections and fan-shaped linings, the fan-shaped linings are installed in the corresponding barrel sections, wedge-shaped surfaces of the barrel sections and the fan-shaped linings are in contact to form wedge-shaped friction pairs, and the upper node and the lower node are connected through a plurality of high-strength bolts and prestressed cables. The invention adopts a multiple prestress and multiple node resistance mechanism, has excellent anti-fatigue property and is suitable for the harsh environment on the sea; the nodes of the invention are convenient to butt joint and are not easy to deform, thus being beneficial to the actual operation during the field construction; the stress condition can be effectively monitored in the using stage, advanced early warning values are provided for replacing bolts and prestressed cables, and the reinforcement cost in the operation and maintenance process can be effectively reduced.

Description

Connecting node suitable for offshore wind power tower cylinder structure and installation method

Technical Field

The invention relates to the technical field of wind power tower barrel structure engineering, in particular to a connecting node suitable for an offshore wind power tower barrel structure and an installation method.

Background

From 2019, newly-added centralized onshore wind power and offshore wind power determine the price of the on-line power through a competitive mode, the era of marking the price of the pole is about to pass, and the requirement on post evaluation of the wind turbine generator is higher. In the bidding era, the generated energy and the performance are particularly important, and the large-scale wind turbine generator and the severe environment faced by offshore wind turbine also put higher requirements on the reliability of the components of the wind turbine generator. The wind power tower cylinder mainly plays a supporting role in the wind power generator set and absorbs the vibration of the wind power generator set, the flange node serves as an important connecting part of a wind power tower cylinder structure, along with the gradual increase of the single-machine capacity of the wind power generator set, the width, the height and the weight of the wind power generator set are increased accordingly, the requirement on the tower cylinder is continuously improved, the requirement on the reliability and the mechanical property of the flange node is further and further increased, and the safe and stable operation of the wind power generator set in the design life can be guaranteed only by guaranteeing the sufficient reliability and the excellent mechanical property of the tower cylinder.

At present, the flange joint used by domestic wind turbine generators mostly adopts an L-shaped thick flange or a reverse balance flange in the traditional design. The traditional design of the L-shaped thick flange is huge in size, insufficient in production conditions and mainly depends on import, the traditional flange can only increase the rigidity strength by increasing the thickness of a flange plate so as to meet the requirements of the development trend of the wind power industry on better reliability and higher mechanical property of a flange system, the material cost and the processing cost are increased by increasing the thickness of the flange plate, the long-term development of the wind power industry is not facilitated, the problem that the overlarge-sized traditional flange is easy to transversely tear is solved, the bolt is not facilitated to be screwed down in the construction process, the potential safety hazard of bolt fracture is easily caused, and the safety degree of the whole structure cannot be guaranteed; the novel reverse balance flange which has independent intellectual property rights and is completely produced in China has low production and processing cost and short period, so the technology is applied to the field of wind power generation as a new connection form of a large-diameter steel pipe structure. However, the reverse balance flange has high precision and high construction difficulty for construction requirements, is difficult to maintain and has high rigidity, and becomes an important factor restricting the development of the reverse balance flange.

Therefore, it is necessary to develop a connection node capable of solving the above problems.

Disclosure of Invention

The invention aims to provide a connecting node of an offshore wind power tower cylinder structure and an assembling method, which adopt a multiple prestress and multiple node resistance mechanism, have excellent anti-fatigue property, convenient construction, good assembling degree and high ultimate bearing capacity, and can monitor the stress strain condition of the connecting part of the offshore wind power generator tower cylinders under the fatigue load action of wind, wave and the like.

The technical scheme adopted for achieving the purpose of the invention is that the connecting node suitable for the offshore wind power tower cylinder structure comprises an upper node, a lower node and a plurality of prestressed cables.

The upper node comprises a barrel section I and a fan-shaped lining I.

The barrel section I is of a hollow round platform structure with an open upper end and an open lower end, the inner cavity of the barrel section I is in a round platform shape, and a plurality of bolt holes are formed in the side wall of the barrel section I.

Be provided with interior flange board I on the inner wall of a section of thick bamboo section I, the lower surface of interior flange board I flushes with the lower surface of a section of thick bamboo section I. Interior flange board I is the ring form, is provided with a plurality of bolt holes on the interior flange board I.

Fan-shaped inside lining I is arc tube structure, and the extrados of fan-shaped inside lining I is provided with I inner wall assorted wedge cross-section of shell ring section, is provided with a plurality of bolt holes on the lateral wall of fan-shaped inside lining I.

Be provided with outer flange board I on the inner wall of fan-shaped inside lining I, the upper surface of outer flange board I flushes with the upper surface of fan-shaped inside lining I, and outer flange board I is fan ring form, is provided with a plurality of through-holes that supply the prestressed cable to pass on the outer flange board I.

In a plurality of section of thick bamboo section I is installed to fan-shaped inside lining I, the wedge cross-section of fan-shaped inside lining I forms the wedge friction pair with the inner wall laminating of section of thick bamboo section I, the lower surface of fan-shaped inside lining I and the upper surface contact of interior flange board I, and the upper surface of fan-shaped inside lining I flushes with the upper surface of section of thick bamboo section I.

A plurality of high-strength bolts penetrate through bolt holes in the barrel section I and the fan-shaped lining I, and each high-strength bolt is screwed into a nut.

The lower node comprises a cylinder section II and a fan-shaped lining II.

The barrel section II is a hollow circular truncated cone structure with an upper end and a lower end open, and the outer diameter of the upper end of the barrel section II is equal to that of the lower end of the barrel section I. The inner cavity of the barrel section II is in an inverted round table shape, and a plurality of bolt holes are formed in the side wall of the barrel section II.

And an inner flange plate II is arranged on the inner wall of the barrel section II, and the upper surface of the inner flange plate II is flush with the upper surface of the barrel section II. The inner flange plate II is in a circular ring shape, and a plurality of bolt holes are formed in the inner flange plate II.

Fan-shaped inside lining II is arc tube structure, and the extrados of fan-shaped inside lining II is provided with the wedge cross-section with II inner wall assorted of shell ring section, is provided with a plurality of bolt holes on the lateral wall of fan-shaped inside lining II.

And an outer flange plate II is arranged on the inner wall of the fan-shaped lining II, the lower surface of the outer flange plate II is flush with the lower surface of the fan-shaped lining II, the outer flange plate II is in a fan-shaped ring shape, and a plurality of through holes for the prestressed cables to pass through are formed in the outer flange plate II.

In a plurality of section of thick bamboo section II is installed to fan-shaped inside lining II, the wedge cross-section of fan-shaped inside lining II forms the wedge friction pair with the inner wall laminating of section of thick bamboo section II, the upper surface of fan-shaped inside lining II and the lower surface contact of interior flange board II, and the lower surface of fan-shaped inside lining II flushes with the lower surface of section of thick bamboo section II.

And a plurality of high-strength bolts penetrate through bolt holes in the cylinder section II and the fan-shaped lining II, and each high-strength bolt is screwed into a nut.

The upper node is installed on the upper end face of the lower node, the inner flange plate I is attached to the inner flange plate II, the high-strength bolts penetrate through bolt holes in the inner flange plate I and the inner flange plate II, and each high-strength bolt II is screwed into a nut to form first flange connection. And a plurality of prestressed cables penetrate through the through holes on the outer flange plate I and the outer flange plate II and are anchored to form a second flange connection.

Further, the lower surface of the cylinder section I, the lower surface of the inner flange plate I, the upper surface of the cylinder section II and the upper surface of the inner flange plate II are milled and processed.

Furthermore, a stress monitoring device is arranged on the prestressed cable.

Furthermore, an annular groove I is formed in the inner wall of the cylinder section I and is close to the inner flange plate I.

Be provided with on fan-shaped inside lining I's the wedge cross-section with I assorted arc flange I of ring channel, arc flange I is close to fan-shaped inside lining I's lower surface, in I embedding ring channel I of arc flange.

Furthermore, an annular groove II is formed in the inner wall of the cylinder section II and is close to the inner flange plate II.

And an arc-shaped flange II matched with the annular groove II is arranged on the wedge-shaped section of the fan-shaped lining II, the arc-shaped flange II is close to the upper surface of the fan-shaped lining II, and the arc-shaped flange II is embedded into the annular groove II.

Furthermore, a plurality of stiffening plates are arranged on the inner walls of the fan-shaped lining I and the fan-shaped lining II.

Based on the assembling method of the connecting node suitable for the offshore wind power tower cylinder structure, the assembling method comprises the following steps:

1) and processing the cylinder section I, the fan-shaped lining I, the cylinder section II and the fan-shaped lining II in a factory.

2) And a plurality of fan-shaped linings I are loaded into the barrel sections I according to the design requirement, and are connected by a plurality of high-strength bolts to form upper nodes. And a plurality of fan-shaped linings II are arranged into the barrel sections II and are connected by a plurality of high-strength bolts to form lower nodes.

3) The upper node is installed on the upper end face of the lower node, the inner flange plate I is attached to the inner flange plate II, the inner flange plate I is connected with the inner flange plate II through a plurality of high-strength bolts to form first flange connection, the outer flange plate I is connected with the outer flange plate II through a plurality of prestressed cables to form second flange connection, and the high-strength bolts and the prestressed cables are arranged in a staggered mode.

The installation method applied to the offshore wind power tower based on the connecting node comprises the following steps:

1) and transporting the connecting node to a tower barrel processing factory.

2) And dismantling the high-strength bolt and the prestressed cable which are connected with the upper node and the lower node.

3) And respectively welding the upper node and the lower node to the corresponding tower drum bodies.

4) And transporting the upper node, the lower node and the tower drum body correspondingly connected to the upper node and the lower node to an installation site.

5) And hoisting and aligning the upper node and the lower node, pre-connecting and correcting the upper node and the lower node by adopting a plurality of prestressed cables, and further connecting the upper node and the lower node by using a plurality of high-strength bolts after the upper node and the lower node are completely aligned.

6) And after all the high-strength bolts are connected with the prestressed cable, applying prestress to the prestressed cable.

Furthermore, the gradients of the outer wall of the barrel section I, the outer wall of the barrel section II and the outer wall of the tower barrel are consistent.

The invention has the beneficial effects that:

1. the wedge-shaped splicing surface between the cylinder section and the fan-shaped lining forms a wedge-shaped friction pair, so that not only can the annular tension between the cylinder section and the fan-shaped lining be reduced, but also the contact surface between the cylinder section and the fan-shaped lining is mainly sheared, and the shearing direction is opposite to the direction of the friction force generated by the wedge-shaped friction pair (is a component force of the annular tension), so that the fatigue damage of the used high-strength bolt is obviously reduced, and the passive bolt tightening force of the transversely arranged high-strength bolt can be improved when the cylinder section and the fan-shaped lining are deformed relatively due to stress, so that the rigidity and the energy consumption of the node are improved; in addition, the high-strength prestressed cable further strengthens the friction force between the cylinder section and the fan-shaped lining, thereby further effectively reducing the annular tension in the normal use stage and improving the fatigue resistance of the high-strength bolt;

2. the connecting joint adopts the form of multiple prestress and multiple joint resistance mechanism, not only has excellent anti-fatigue property and is suitable for the severe environment on the sea, but also has strong supporting and reinforcing functions, thereby simplifying the construction difficulty; meanwhile, the form of a multiple prestress and multiple node resistance mechanism provides diversified construction sequences for mastering the construction accuracy, so that the site actual construction has diversified choices; all the cylinders do not need to be processed in a factory, a huge component is formed and then the huge component is transported to a construction site, only the tower barrel with the flange part can be processed in the factory and transported to the construction site together with other cylinders, and the vertical hoisting is carried out from bottom to top, so that the transportation is facilitated, the smooth welding of the cylinders among the cylinders is facilitated, and the material cost and the labor cost generated by correcting the deformation of the flange on the hoisting site are saved;

3. the connecting flange and the tower frame are all in flexible connection due to the wedge-shaped splicing surface and the prestressed anchor cable, so that the change of the frequency of the fan caused by the sudden change of the rigidity of the fan is not easy to occur; the number of the stiffening plates is greatly reduced, and the construction process is simple and accurate;

4. for data monitoring of the prestressed anchor cable, the stress condition of the tower can be intuitively known, and the method plays an important role in preventing accidents.

Drawings

FIG. 1 is a schematic diagram of a connection node according to the present invention;

FIG. 2 is a cross-sectional view A-A of FIG. 1;

FIG. 3 is a schematic view of a cartridge segment I;

FIG. 4 is a first schematic view of fan liner I;

FIG. 5 is a second schematic view of fan liner I;

FIG. 6 is a schematic diagram of an upper node;

FIG. 7 is a schematic view of a prestressing cable;

FIG. 8 is a schematic view of barrel section II;

FIG. 9 is a first schematic view of fan liner II;

FIG. 10 is a second schematic view of fan liner II;

FIG. 11 is a schematic view of a lower node;

fig. 12 is a schematic diagram of the application of the node of the present invention in practical engineering.

In the figure: go up node 1, shell ring section I101, fan-shaped inside lining I102, outer flange board I1021, inner flange board I103, lower node 2, shell ring section II 201, fan-shaped inside lining II 202, outer flange board II 2021, inner flange board II 203, prestressed cable 3, ring channel I4, arc flange I5, stress monitoring device 6, ring channel II 7, arc flange II 8 and stiffening plate 9.

Detailed Description

The present invention is further illustrated by the following examples, but it should not be construed that the scope of the above-described subject matter is limited to the following examples. Various substitutions and alterations can be made without departing from the technical idea of the invention and the scope of the invention is covered by the present invention according to the common technical knowledge and the conventional means in the field.

Example 1:

referring to fig. 1, the embodiment discloses a connection node suitable for an offshore wind power tower structure, which includes an upper node 1, a lower node 2 and a plurality of prestressed cables 3.

Referring to fig. 6, the upper node 1 includes a barrel section i 101 and a fan-shaped liner i 102.

Section of thick bamboo I101 is inside cavity and the open round platform structure of upper and lower end, and the inside cavity of section of thick bamboo I101 is the round platform form, is provided with a plurality of bolt holes on section of thick bamboo I101's the lateral wall.

Referring to fig. 3, an inner flange plate i 103 is arranged on the inner wall of the barrel section i 101, and the lower surface of the inner flange plate i 103 is flush with the lower surface of the barrel section i 101. The I103 of inner flange board is the ring form, is provided with a plurality of bolt holes on the I103 of inner flange board.

Referring to fig. 4 or 5, the fan-shaped liner i 102 is of an arc-shaped cylinder structure, the outer arc surface of the fan-shaped liner i 102 is provided with a wedge-shaped cross section matched with the inner wall of the cylinder section i 101, and the side wall of the fan-shaped liner i 102 is provided with a plurality of bolt holes.

The inner wall of the fan-shaped lining I102 is provided with an outer flange plate I1021, the upper surface of the outer flange plate I1021 is flush with the upper surface of the fan-shaped lining I102, the outer flange plate I1021 is in a fan-shaped ring shape, and the outer flange plate I1021 is provided with a plurality of through holes for the prestressed cables 3 to pass through. Referring to fig. 7, a schematic diagram of the prestressed cable 3 is shown.

Referring to fig. 6, a plurality of fan-shaped liners i 102 are installed in the barrel section i 101, wedge-shaped sections of the fan-shaped liners i 102 are attached to the inner wall of the barrel section i 101 to form wedge-shaped friction pairs, the lower surfaces of the fan-shaped liners i 102 are in contact with the upper surface of the inner flange plate i 103, and the upper surfaces of the fan-shaped liners i 102 are flush with the upper surface of the barrel section i 101. A plurality of fan-shaped liners I102 can be closely arranged along the circumferential direction of the cylinder section I101, and can also be arranged at intervals according to design requirements.

Referring to fig. 3, the inner wall of the cylinder section i 101 is provided with an annular groove i 4, and the annular groove i 4 is close to the inner flange plate i 103. Referring to fig. 5, an arc-shaped flange i 5 matched with the annular groove i 4 is arranged on the wedge-shaped section of the fan-shaped lining i 102, the arc-shaped flange i 5 is close to the lower surface of the fan-shaped lining i 102, and the arc-shaped flange i 5 is embedded into the annular groove i 4.

A plurality of high-strength bolts penetrate through bolt holes in the barrel section I101 and the fan-shaped lining I102, and each high-strength bolt is screwed into a nut.

Referring to fig. 11, the lower node 2 includes a barrel section ii 201 and a fan-shaped liner ii 202.

Referring to fig. 8, the second cylinder segment 201 is a circular truncated cone structure with a hollow interior and an opening upper end and a opening lower end, and the outer diameter of the upper end of the second cylinder segment 201 is equal to the outer diameter of the lower end of the first cylinder segment 101. The inner cavity of the barrel section II 201 is in an inverted round table shape, and a plurality of bolt holes are formed in the side wall of the barrel section II 201. The taper of the barrel section II 201 is consistent with that of the barrel section I101.

An inner flange plate II 203 is arranged on the inner wall of the barrel section II 201, and the upper surface of the inner flange plate II 203 is flush with the upper surface of the barrel section II 201. The inner flange plate II 203 is circular ring-shaped, and a plurality of bolt holes are formed in the inner flange plate II 203.

Referring to fig. 9 or 10, the fan-shaped liner ii 202 is an arc-shaped cylinder structure, the outer arc surface of the fan-shaped liner ii 202 is provided with a wedge-shaped cross section matched with the inner wall of the cylinder section ii 201, and the side wall of the fan-shaped liner ii 202 is provided with a plurality of bolt holes.

An outer flange plate II 2021 is arranged on the inner wall of the fan-shaped lining II 202, the lower surface of the outer flange plate II 2021 is flush with the lower surface of the fan-shaped lining II 202, the outer flange plate II 2021 is in a fan-shaped ring shape, and a plurality of through holes for the prestressed cables 3 to pass through are formed in the outer flange plate II 2021.

Referring to fig. 11, a plurality of fan-shaped liners ii 202 are installed in the barrel section ii 201, the wedge-shaped cross section of the fan-shaped liners ii 202 is attached to the inner wall of the barrel section ii 201 to form a wedge-shaped friction pair, the upper surface of the fan-shaped liners ii 202 is in contact with the lower surface of the inner flange plate ii 203, and the lower surface of the fan-shaped liners ii 202 is flush with the lower surface of the barrel section ii 201. A plurality of fan-shaped linings II 202 can be closely arranged along the circumferential direction of the shell section II 201, and can also be arranged at intervals according to design requirements.

Referring to fig. 8, an annular groove ii 7 is formed in the inner wall of the barrel section ii 201, and the annular groove ii 7 is close to the inner flange plate ii 203. Referring to fig. 10, an arc-shaped flange ii 8 matched with the annular groove ii 7 is arranged on the wedge-shaped section of the fan-shaped lining ii 202, the arc-shaped flange ii 8 is close to the upper surface of the fan-shaped lining ii 202, and the arc-shaped flange ii 8 is embedded into the annular groove ii 7.

And a plurality of high-strength bolts penetrate through bolt holes in the cylinder section II 201 and the fan-shaped lining II 202, and each high-strength bolt is screwed into a nut. And a plurality of stiffening plates 9 are arranged on the inner walls of the fan-shaped lining I102 and the fan-shaped lining II 202.

During assembly, the lower surface of the barrel section I101, the lower surface of the inner flange plate I103, the upper surface of the barrel section II 201 and the upper surface of the inner flange plate II 203 are milled flat. And then the upper node 1 is arranged on the upper end surface of the lower node 2, the inner flange plate I103 is attached to the inner flange plate II 203, a plurality of high-strength bolts penetrate through bolt holes in the inner flange plate I103 and the inner flange plate II 203, and each high-strength bolt II is screwed into a nut to form first flange connection. And a plurality of prestressed cables 3 penetrate through holes in the outer flange plate I1021 and the outer flange plate II 2021 and are anchored to form a second flange connection.

Referring to fig. 2, the prestressed cable 3 is provided with a stress monitoring device 6, and the stress monitoring device 6 may be a strain gauge or a tension monitor, and the like, and can monitor the stress of the prestressed cable 3 in real time, which is beneficial to operation, maintenance and overhaul in the use stage.

It is worth to be noted that, the connection node of the offshore wind power tower cylinder structure in the embodiment adopts the form of multiple prestress and multiple node resistance mechanism, so that the connection node has excellent fatigue resistance and is suitable for the harsh environment on the sea, and the connection node has strong supporting and reinforcing effects due to the structural characteristics, thereby simplifying the construction difficulty; the form of the multiple prestress and multiple node resistance mechanism provides diversified construction sequences for mastering the construction accuracy, so that diversified choices are provided for field actual construction; all the cylinders do not need to be processed in a factory, the cylinders are transported to a construction site after forming a huge member, the tower barrel with the flange part can be processed in the factory and transported to the construction site together with other cylinders, the transportation is facilitated through vertical hoisting from bottom to top, the smooth welding of the cylinders among the cylinders is facilitated, the material cost and the labor cost generated by correcting the deformation of the flange on the hoisting site are saved, and the benefits are brought to enterprises. In addition, the wedge-shaped splicing surface between the cylinder section with the wedge-shaped cylinder wall and the flange ring consisting of the fan-shaped lining forms a wedge-shaped friction pair, so that not only can the annular tension between the cylinder section and the fan-shaped lining be reduced, but also the contact surface between the cylinder section and the fan-shaped lining is mainly sheared, and the directions of the shearing forces are opposite to the directions of the friction forces generated by the wedge-shaped friction pair, so that the fatigue damage of the used high-strength bolt is remarkably reduced, the passive bolt tightening force of the transversely-arranged high-strength bolt can be improved when the cylinder section and the fan-shaped lining are relatively deformed due to stress, and the rigidity and the energy consumption of the node are. After prestress is applied to the high-strength prestressed cable which can be provided with a monitoring device, the friction force of a wedge-shaped friction pair generated between the cylinder segment and the fan-shaped lining is further enhanced, so that the annular tension at the normal use stage is further effectively reduced, the fatigue resistance of the high-strength bolt is improved again, and finally, a form of a multi-prestress and multi-node resistance mechanism is really formed, so that the high-strength prestressed cable has excellent fatigue resistance and is suitable for a severe environment on the sea; the butt joint is convenient, the deformation is not easy to occur, and the actual operation in the field construction is facilitated; the stress condition can be effectively monitored in the using stage, advanced early warning values are provided for bolt replacement and prestressed cables, and the reinforcing cost in the operation and maintenance process can be effectively reduced by the form of the invention. Meanwhile, the stiffening plate is positioned between the flange plate and the tower drum, compared with the L-shaped thick flange in the traditional design, the length of the bolt is increased by increasing the height of the stiffening plate, the thickness of the flange is not changed, the application of the pretightening force of the bolt is facilitated, and the bending rigidity of the tower drum is ensured; compared with a reverse balance flange, the connecting flange and the tower frame are all in flexible connection due to the wedge-shaped splicing surfaces and the prestressed anchor cables, and the change of the frequency of the fan caused by the sudden change of the rigidity of the fan is not easy to occur. The number of the stiffening plates is greatly reduced, and the adopted form of a multi-prestress and multi-node resistance mechanism is not like the construction of a reverse balance flange and needs to be very accurate. Finally, the stress condition of the tower can be intuitively known through data monitoring of the prestressed anchor cable, and the method plays an important role in preventing accidents. Moreover, due to the position design of the bolt, the replacement of certain parts can be realized in the operation, maintenance and repair processes, and the requirements of the intelligent engineering age are particularly matched.

Example 2:

the embodiment discloses an assembling method of a connecting node suitable for an offshore wind power tower structure based on embodiment 1, and the assembling method includes the following steps:

1) the barrel section I101, the fan-shaped liner I102, the barrel section II 201 and the fan-shaped liner II 202 are machined at the factory.

2) A plurality of fan-shaped linings I102 are installed into the barrel section I101 according to design requirements, and are connected through a plurality of high-strength bolts to form an upper node 1. And a plurality of fan-shaped linings II 202 are loaded into the barrel sections II 201 and are connected by a plurality of high-strength bolts to form a lower node 2.

3) The upper node 1 is arranged on the upper end face of the lower node 2, the inner flange plate I103 is attached to the inner flange plate II 203, the inner flange plate I103 is connected with the inner flange plate II 203 through a plurality of high-strength bolts to form a first flange connection, the outer flange plate I1021 and the outer flange plate II 2021 are connected through a plurality of prestressed cables 3 to form a second flange connection, and the high-strength bolts and the prestressed cables 3 are arranged in a staggered mode.

Example 3:

the embodiment discloses an installation method of a connecting node applied to an offshore wind power tower based on embodiment 1, which includes the following steps:

1) and transporting the connecting node to a tower barrel processing factory.

2) And (3) dismantling the high-strength bolt and the prestressed cable 3 which are connected with the upper node 1 and the lower node 2.

3) And respectively welding the upper node 1 and the lower node 2 to the corresponding tower drum bodies, wherein the gradients of the outer wall of the drum section I101, the outer wall of the drum section II 201 and the outer wall of the tower drum are consistent, the outer diameter of the upper end of the drum section I101 is consistent with the outer diameter of the welded tower drum, and the outer diameter of the lower end of the drum section II 201 is consistent with the outer diameter of the welded tower drum.

4) And transporting the upper node 1, the lower node 2 and the tower barrel correspondingly connected to each other to an installation site.

5) And hoisting and aligning the upper node 1 and the lower node 2, adopting a plurality of prestressed cables 3 to pre-connect and rectify the upper node 1 and the lower node 2, and after the upper node 1 and the lower node 2 are completely aligned, further connecting the upper node 1 and the lower node 2 by using a plurality of high-strength bolts.

6) And after all the high-strength bolts are connected with the prestressed cable 3, applying prestress to the prestressed cable 3 to finish construction.

Referring to fig. 12, it is a schematic diagram of an application of the connection node in an actual engineering, where a circled portion of an ellipse is the connection node.

Example 4:

Referring to fig. 6, a plurality of fan-shaped liners i 102 are installed in the barrel section i 101, wedge-shaped sections of the fan-shaped liners i 102 are attached to the inner wall of the barrel section i 101 to form wedge-shaped friction pairs, the lower surfaces of the fan-shaped liners i 102 are in contact with the upper surface of the inner flange plate i 103, and the upper surfaces of the fan-shaped liners i 102 are flush with the upper surface of the barrel section i 101.

Referring to fig. 8, the second cylinder segment 201 is a circular truncated cone structure with a hollow interior and an opening upper end and a opening lower end, and the outer diameter of the upper end of the second cylinder segment 201 is equal to the outer diameter of the lower end of the first cylinder segment 101. The inner cavity of the barrel section II 201 is in an inverted round table shape, and a plurality of bolt holes are formed in the side wall of the barrel section II 201.

Referring to fig. 11, a plurality of fan-shaped liners ii 202 are installed in the barrel section ii 201, the wedge-shaped cross section of the fan-shaped liners ii 202 is attached to the inner wall of the barrel section ii 201 to form a wedge-shaped friction pair, the upper surface of the fan-shaped liners ii 202 is in contact with the lower surface of the inner flange plate ii 203, and the lower surface of the fan-shaped liners ii 202 is flush with the lower surface of the barrel section ii 201.

And a plurality of high-strength bolts penetrate through bolt holes in the cylinder section II 201 and the fan-shaped lining II 202, and each high-strength bolt is screwed into a nut.

Referring to fig. 2, the upper node 1 is installed on the upper end face of the lower node 2, the inner flange plate I103 is attached to the inner flange plate II 203, the high-strength bolts penetrate through bolt holes in the inner flange plate I103 and the inner flange plate II 203, and each high-strength bolt II is screwed into a nut to form first flange connection. And a plurality of prestressed cables 3 penetrate through holes in the outer flange plate I1021 and the outer flange plate II 2021 and are anchored to form a second flange connection.

Example 5:

the main structure of this embodiment is the same as that of embodiment 4, and further, the lower surface of the barrel section i 101, the lower surface of the inner flange plate i 103, the upper surface of the barrel section ii 201, and the upper surface of the inner flange plate ii 203 are milled flat.

Example 6:

the main structure of this embodiment is the same as that of embodiment 5, and further, referring to fig. 2, a stress monitoring device 6 is disposed on the prestressed cable 3.

Example 7:

the main structure of this embodiment is the same as that of embodiment 6, and further, referring to fig. 3, an annular groove i 4 is formed in the inner wall of the cylinder section i 101, and the annular groove i 4 is close to the inner flange plate i 103.

Referring to fig. 5, an arc-shaped flange i 5 matched with the annular groove i 4 is arranged on the wedge-shaped section of the fan-shaped lining i 102, the arc-shaped flange i 5 is close to the lower surface of the fan-shaped lining i 102, and the arc-shaped flange i 5 is embedded into the annular groove i 4.

Example 8:

the main structure of this embodiment is the same as that of embodiment 7, and further, referring to fig. 8, an annular groove ii 7 is provided on the inner wall of the cylinder segment ii 201, and the annular groove ii 7 is close to the inner flange plate ii 203.

Referring to fig. 10, an arc-shaped flange ii 8 matched with the annular groove ii 7 is arranged on the wedge-shaped section of the fan-shaped lining ii 202, the arc-shaped flange ii 8 is close to the upper surface of the fan-shaped lining ii 202, and the arc-shaped flange ii 8 is embedded into the annular groove ii 7.

Example 9:

the main structure of this embodiment is the same as that of embodiment 8, and further, referring to fig. 2, the inner walls of the fan-shaped liners i 102 and ii 202 are both provided with a plurality of stiffening plates 9.

Claims

1. The utility model provides a connected node suitable for offshore wind power tower cylinder structure which characterized in that: the prestressed steel cable comprises an upper node (1), a lower node (2) and a plurality of prestressed cables (3);

the upper node (1) comprises a barrel section I (101) and a fan-shaped lining I (102);

the barrel section I (101) is of a circular truncated cone structure which is hollow inside and open at the upper end and the lower end, the inner cavity of the barrel section I (101) is in a circular truncated cone shape, and a plurality of bolt holes are formed in the side wall of the barrel section I (101);

an inner flange plate I (103) is arranged on the inner wall of the cylinder section I (101), and the lower surface of the inner flange plate I (103) is flush with the lower surface of the cylinder section I (101); the inner flange plate I (103) is annular, and a plurality of bolt holes are formed in the inner flange plate I (103);

the fan-shaped lining I (102) is of an arc-shaped cylinder structure, the outer arc surface of the fan-shaped lining I (102) is provided with a wedge-shaped cross section matched with the inner wall of the cylinder section I (101), and the side wall of the fan-shaped lining I (102) is provided with a plurality of bolt holes;

an outer flange plate I (1021) is arranged on the inner wall of the fan-shaped lining I (102), the upper surface of the outer flange plate I (1021) is flush with the upper surface of the fan-shaped lining I (102), the outer flange plate I (1021) is in a fan-ring shape, and a plurality of through holes for the prestressed cables (3) to pass through are formed in the outer flange plate I (1021);

the fan-shaped linings I (102) are installed in the barrel section I (101), wedge-shaped sections of the fan-shaped linings I (102) are attached to the inner wall of the barrel section I (101) to form wedge-shaped friction pairs, the lower surfaces of the fan-shaped linings I (102) are in contact with the upper surface of the inner flange plate I (103), and the upper surfaces of the fan-shaped linings I (102) are flush with the upper surface of the barrel section I (101);

a plurality of high-strength bolts penetrate through bolt holes in the barrel section I (101) and the fan-shaped lining I (102), and each high-strength bolt is screwed into a nut;

the lower node (2) comprises a barrel section II (201) and a fan-shaped lining II (202);

the barrel section II (201) is of a circular truncated cone structure which is hollow inside and open at the upper end and the lower end, and the outer diameter of the upper end of the barrel section II (201) is equal to that of the lower end of the barrel section I (101); the inner cavity of the barrel section II (201) is in an inverted round table shape, and a plurality of bolt holes are formed in the side wall of the barrel section II (201);

an inner flange plate II (203) is arranged on the inner wall of the cylinder section II (201), and the upper surface of the inner flange plate II (203) is flush with the upper surface of the cylinder section II (201); the inner flange plate II (203) is annular, and a plurality of bolt holes are formed in the inner flange plate II (203);

the fan-shaped lining II (202) is of an arc-shaped cylinder structure, the outer arc surface of the fan-shaped lining II (202) is provided with a wedge-shaped cross section matched with the inner wall of the cylinder section II (201), and the side wall of the fan-shaped lining II (202) is provided with a plurality of bolt holes;

an outer flange plate II (2021) is arranged on the inner wall of the fan-shaped lining II (202), the lower surface of the outer flange plate II (2021) is flush with the lower surface of the fan-shaped lining II (202), the outer flange plate II (2021) is in a fan ring shape, and a plurality of through holes for the prestressed cables (3) to pass through are formed in the outer flange plate II (2021);

the fan-shaped linings II (202) are installed in the cylinder section II (201), the wedge-shaped sections of the fan-shaped linings II (202) are attached to the inner wall of the cylinder section II (201) to form a wedge-shaped friction pair, the upper surface of the fan-shaped linings II (202) is in contact with the lower surface of the inner flange plate II (203), and the lower surface of the fan-shaped linings II (202) is flush with the lower surface of the cylinder section II (201);

a plurality of high-strength bolts penetrate through bolt holes in the cylinder section II (201) and the fan-shaped lining II (202), and each high-strength bolt is screwed into a nut;

the upper node (1) is installed on the upper end face of the lower node (2), the inner flange plate I (103) is attached to the inner flange plate II (203), a plurality of high-strength bolts penetrate through bolt holes in the inner flange plate I (103) and the inner flange plate II (203), and each high-strength bolt II is screwed into a nut to form first flange connection; and a plurality of prestressed cables (3) penetrate through holes in the outer flange plate I (1021) and the outer flange plate II (2021) and are anchored to form a second flange connection.

2. The connection node suitable for an offshore wind turbine tower structure, according to claim 1, wherein: the lower surface of the barrel section I (101), the lower surface of the inner flange plate I (103), the upper surface of the barrel section II (201) and the upper surface of the inner flange plate II (203) are subjected to milling treatment.

3. The connection node suitable for an offshore wind turbine tower structure, according to claim 1, wherein: and a stress monitoring device (6) is arranged on the prestressed cable (3).

4. The connection node suitable for an offshore wind turbine tower structure, according to claim 1, wherein: an annular groove I (4) is formed in the inner wall of the cylinder section I (101), and the annular groove I (4) is close to the inner flange plate I (103);

be provided with on the wedge cross-section of fan-shaped inside lining I (102) with I (4) assorted arc flange I (5) of ring channel, arc flange I (5) are close to the lower surface of fan-shaped inside lining I (102), in I (4) embedding ring channel of arc flange I (5).

5. The connection node suitable for an offshore wind turbine tower structure, according to claim 1, wherein: an annular groove II (7) is formed in the inner wall of the cylinder section II (201), and the annular groove II (7) is close to the inner flange plate II (203);

an arc-shaped flange II (8) matched with the annular groove II (7) is arranged on the wedge-shaped section of the fan-shaped lining II (202), the arc-shaped flange II (8) is close to the upper surface of the fan-shaped lining II (202), and the arc-shaped flange II (8) is embedded into the annular groove II (7).

6. The connection node suitable for an offshore wind turbine tower structure, according to claim 1, wherein: and a plurality of stiffening plates (9) are arranged on the inner walls of the fan-shaped lining I (102) and the fan-shaped lining II (202).

7. The method for assembling the connecting node suitable for the offshore wind power tower structure according to claim 1, wherein the method comprises the following steps: the method comprises the following steps:

1) machining the barrel section I (101), the fan-shaped lining I (102), the barrel section II (201) and the fan-shaped lining II (202) in a factory;

2) a plurality of fan-shaped linings I (102) are arranged into a barrel section I (101) according to design requirements, and a plurality of high-strength bolts are adopted for connection to form an upper node (1); a plurality of fan-shaped linings II (202) are arranged into the barrel sections II (201) and are connected by a plurality of high-strength bolts to form lower nodes (2);

3) the upper node (1) is arranged on the upper end face of the lower node (2), the inner flange plate I (103) is attached to the inner flange plate II (203), the inner flange plate I (103) is connected with the inner flange plate II (203) through a plurality of high-strength bolts to form first flange connection, the outer flange plate I (1021) is connected with the outer flange plate II (2021) through a plurality of prestressed cables (3) to form second flange connection, and the high-strength bolts and the prestressed cables (3) are arranged in a staggered mode.

8. The method for installing the offshore wind power tower based on the connection node of claim 1, is characterized in that: the method comprises the following steps:

1) transporting the connecting node to a tower barrel processing factory;

2) dismantling the high-strength bolt and the prestressed cable (3) which connect the upper node (1) and the lower node (2);

3) respectively welding the upper node (1) and the lower node (2) to the corresponding tower drum bodies;

4) transporting the upper node (1), the lower node (2) and the tower drum bodies correspondingly connected to the upper node and the lower node to an installation site;

5) hoisting and aligning the upper node (1) and the lower node (2), adopting a plurality of prestressed cables (3) to pre-connect and rectify the upper node (1) and the lower node (2), and further connecting the upper node (1) and the lower node (2) by using a plurality of high-strength bolts after the upper node (1) and the lower node (2) are completely aligned;

6) and after all the high-strength bolts are connected with the prestressed cable (3), prestress is applied to the prestressed cable (3).

9. The method for installing the offshore wind turbine tower applicable to the offshore wind turbine tower structure according to claim 7, wherein the method comprises the following steps: the outer wall of the barrel section I (101), the outer wall of the barrel section II (201) and the outer wall of the tower barrel are consistent in inclination.