An assembled pier structure and construction method suitable for offshore wind turbine transportation

Abstract

The present invention discloses an assembled pier structure suitable for offshore wind turbine transportation, comprising: a prefabricated pier module, wherein a reserved hole penetrating up and down is arranged in the middle, and embedded steel is arranged at the reserved hole; a pile foundation, wherein a pile core steel cage is arranged inside, and at the same time, the pile inner steel is evenly welded vertically upward around the inner wall of the top of the pile foundation, and the pile foundation is located below the prefabricated pier module; a corbel is welded to the outer wall of the pile foundation, the bottom of the prefabricated pier module is placed above the corbel, and the embedded steel is placed on the top of the pile foundation at the same time; a bottom mold, which is circumferentially sleeved outside the pile foundation, and a hoop is arranged at the bottom of the bottom mold; wherein, UHPC grouting material is poured into the space below the top of the pile foundation except the pile foundation in the reserved hole of the prefabricated pier module, and fine stone concrete is poured above the top of the pile foundation and inside the pile core. In the present invention, the prefabricated pier module is prefabricated, and the offshore assembly and installation of each module is completed by using a pontoon and related traction devices, thereby realizing the rapid and green construction of the wind turbine transportation platform.

Description

Technical Field

[0001] The present invention relates to the application field of offshore wind power equipment, and more specifically, to an assembled pier structure and construction method suitable for offshore wind turbine transportation. Background Art

[0002] The development of offshore wind power industry is conducive to optimizing the energy structure and meeting the requirements of accelerating the construction of a new energy system. Offshore wind turbine equipment is usually irregular in shape, large in size and heavy in weight. If it is transferred from land to offshore ships at an offshore terminal, a transfer pier must be set at the corner of the approach bridge and the terminal to meet the special transfer requirements of offshore wind turbines.

[0003] The offshore wind turbine transfer pier needs to bear the load of wind turbine equipment, so its transfer pier structure is relatively large. The traditional method is to lay a complex bottom formwork support system on the top of the pile foundation, then tie the steel bars and pour the concrete in layers. After the pouring is completed, a shielded confined space is formed at the bottom of the pier. Especially under the influence of waves and currents, personnel and ship machinery and equipment cannot enter the bottom of the pier to dismantle the bottom formwork support system composed of steel sections, bamboo plywood, etc.; at the same time, the thickness of the pier panel is relatively large, the layered pouring operation cycle is long, the concrete quality control is difficult, and the safety risk of offshore operations is high. Summary of the invention

[0004] In order to achieve these purposes and other advantages according to the present invention, a preferred embodiment of the present invention provides a prefabricated pier structure suitable for offshore wind turbine transportation, comprising:

[0005] A prefabricated pier module is provided with a reserved hole running through it from top to bottom, and embedded steel is arranged at the reserved hole. The embedded steel includes a transverse steel and a longitudinal steel. One end of the embedded steel is anchored inside the reinforced concrete structure of the prefabricated pier module, and the other end is welded or bolted at the reserved hole. The transverse steel runs through the reserved hole transversely, and the longitudinal steel runs through the reserved hole longitudinally. Outrigger steel bars are horizontally arranged on the inner wall of the reserved hole of the prefabricated pier module.

[0006] A pile foundation, wherein a pile core steel cage is arranged inside the pile foundation, and pile inner steel is evenly welded vertically upward around the inner wall of the top of the pile foundation. The pile foundation is located below the prefabricated pier module, and the pile core steel cage and the pile inner steel extend upward through the reserved hole to the protruding steel bars of the prefabricated pier module;

[0007] Corbels, at least four of which are evenly welded around the outer wall of the pile foundation at a certain distance from the top of the pile foundation, the bottom of the prefabricated pier module is placed on the corbels, and the embedded steel inside the prefabricated pier module is placed on the top of the pile foundation at the same time;

[0008] The bottom mold is a hemispherical structure, the bottom mold is annularly sleeved outside the pile foundation, and a hoop is provided at the bottom of the bottom mold;

[0009] The space in the reserved hole of the prefabricated pier module, excluding the pile foundation and below the top of the pile foundation, is filled with UHPC grouting material, and the space above the top of the pile foundation and inside the pile core is filled with fine stone concrete.

[0010] According to a preferred embodiment of the present invention, the clamp is connected to the hemispherical plastic bottom mold through a reserved slot.

[0011] According to a preferred embodiment of the present invention, a rubber pad is arranged on the top of the hemispherical plastic bottom mold.

[0012] According to a preferred embodiment of the present invention, the corbel top elevation is the top elevation of the prefabricated pier installation.

[0013] On the other hand, another technical solution of the present invention further provides a construction method of an assembled pier structure suitable for offshore wind turbine transportation, comprising the following steps:

[0014] S1. The prefabricated pier modules are prefabricated in the factory;

[0015] S2. The pile foundation is sunk in the on-site pier area, and then at least 4 brackets are evenly welded around the top of the pile foundation, and at least 2 pile inner steels are welded on the inner wall of the pile foundation. At the same time, a hemispherical bottom mold is installed. The top of the bottom mold is flush with the top of the bracket, and a rubber pad is set. A hoop is installed at the bottom of the bottom mold, and the hoop is fixed to the pile foundation by bolts. Finally, the pile core steel cage is lowered inside the pile foundation;

[0016] S3. The pontoon is tied to the bottom of the prefabricated pier abutment module. After being transported to the construction area by ship, it is floated to the water surface with the help of the pontoon. The prefabricated pier abutment module is floated to the water area where the piles have been sunk by the tide. The angle and position are adjusted by the traction devices around it. Then, as the tide level slowly decreases, the prefabricated pier abutment module sinks, and the pile foundation is gradually inserted into the reserved hole of the prefabricated pier abutment module to complete the positioning of the prefabricated structure;

[0017] S4, after the water level drops to a certain level, the prefabricated pier module is completely placed on the top of the pile foundation, the embedded steel is placed on the top of the pile foundation, the bottom of the prefabricated pier module is placed on the top of the bracket, the prefabricated pier module is completely supported by the pile foundation, and then the extended steel bars inside the reserved holes of the prefabricated pier module are welded and connected to each other, and the extended steel bars are welded to the steel bars inside the pile;

[0018] S5. Pour UHPC grouting material between the corbel and the bottom formwork, and between the embedded steel and the bottom formwork of the prefabricated pier module, and then use fine stone concrete to cast and vibrate the pile core concrete and the pile top to complete the connection between the prefabricated pier and the pile foundation.

[0019] The present invention has at least the following beneficial effects:

[0020] (1) The construction method of the prefabricated pier structure of the present invention is to produce prefabricated pier modules in a standardized manner in the factory, and use pontoons and related traction devices to complete the offshore assembly and installation of each module, thereby avoiding the problems of long operation cycle and severe environmental pollution caused by offshore cast-in-place concrete construction operations, and realizing the rapid and green construction of offshore wind turbine transfer platforms.

[0021] (2) The prefabricated pier structure replaces the traditional cast-in-place structure. A plastic bottom formwork is set at the bottom, wrapping up to the position of the pile foundation corbel. The structure is simple and replaces the complex bottom formwork support system at the bottom of the traditional cast-in-place pier, avoiding the safety and quality problems caused by the water installation and dismantling of the cast-in-place support system in a confined space.

[0022] (3) The prefabricated pier structure is floated and positioned as a whole in the sea with the help of the rise and fall of the tide. When the tide is high, it is floated to the pile foundation water area using a pontoon. When the tide is low, the prefabricated pier structure is completely placed on the pile top by setting embedded steel in the reserved hole and welding brackets on the pile top to complete the positioning and installation. This reduces the use of large ship machinery and equipment and improves the economic benefits of the project.

[0023] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic plan view of the prefabricated pier module of the present invention;

[0025] Figure 2 It is a schematic elevation view of the prefabricated pier module of the present invention;

[0026] Figure 3 It is a schematic elevation view of a reserved hole in a prefabricated pier module of the present invention;

[0027] Figure 4 It is a schematic elevation view of the pile foundation and bottom formwork of the present invention;

[0028] Figure 5 It is a schematic diagram of positioning the prefabricated pier module of the present invention according to the tide;

[0029] Figure 6 This is a schematic diagram of the installation of the prefabricated pier module of the present invention at low tide;

[0030] Figure 7 It is a schematic plan view of the installation of the prefabricated pier of the present invention;

[0031] Figure 8 It is a schematic elevation diagram of the prefabricated pier of the present invention after grouting and pouring are completed.

[0032] In the figure: 1-prefabricated pier module; 101-reserved hole; 102-transverse steel; 103-longitudinal steel; 104-extending steel bar; 2-pile foundation; 301-plastic bottom form; 302-hoop; 303-slot; 304-corbel; 401-pile core steel cage; 402-steel inside the pile; 5-pontoon; 6-UHPC grouting material; 7-fine stone concrete. DETAILED DESCRIPTION

[0033] The present invention is further described in detail below in conjunction with the accompanying drawings so that those skilled in the art can implement the invention with reference to the description.

[0034] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art can think of other obvious variations. The basic principles of the present invention defined in the following description can be applied to other embodiments, variations, improvements, equivalents, and other technical solutions that do not deviate from the spirit and scope of the present invention.

[0035] Those skilled in the art should understand that, in the disclosure of the present invention, the orientation or position relationship indicated by the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. are based on the orientation or position relationship shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the above terms should not be understood as limiting the present invention.

[0036] It is to be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the element may be multiple, and the term "one" should not be understood as a limitation on the quantity.

[0037] like Figure 1-8 As shown, the present invention is an assembled pier structure suitable for offshore wind turbine transportation, characterized in that it includes:

[0038] A prefabricated pier module 1 is provided with a reserved hole 101 which runs through the upper and lower parts in the middle. Pre-embedded steel is arranged at the reserved hole 101. The embedded steel includes a transverse steel 102 and a longitudinal steel 103. One end of the embedded steel is anchored inside the reinforced concrete structure of the prefabricated pier module, and the other end is welded or bolted at the reserved hole 101. The transverse steel 102 runs through the reserved hole transversely, and the longitudinal steel 103 runs through the reserved hole longitudinally. An extended steel bar 104 is horizontally and transversely arranged on the inner wall of the reserved hole 101 of the prefabricated pier module 1.

[0039] A pile foundation 2, in which a pile core steel cage 401 is arranged, and pile inner steel 402 is evenly welded vertically upward around the inner wall of the top of the pile foundation. The pile foundation 2 is located below the prefabricated pier module 1, and the pile core steel cage 401 and the pile inner steel 402 extend upward through the reserved hole 101 to the outrigger steel bars 104 of the prefabricated pier module;

[0040] The outer wall of the pile foundation is evenly welded with at least four of the brackets 304 at a certain distance from the top of the pile foundation. The bottom of the prefabricated pier module 1 is placed on the brackets 304, and the embedded steel inside the prefabricated pier module 1 is placed on the top of the pile foundation at the same time.

[0041] The bottom mold 301 is a hemispherical structure. The bottom mold 301 is annularly sleeved outside the pile foundation 2. A hoop 302 is provided at the bottom of the bottom mold 301.

[0042] The reserved hole 101 of the prefabricated pier module 1 is filled with UHPC grouting material 6 except for the pile foundation 2 and below the top of the pile foundation, and fine stone concrete 7 is poured above the top of the pile foundation and inside the pile core.

[0043] In the above technical solution, a plurality of prefabricated pier modules 1 can be assembled into a complete transfer pier. The radius of the reserved hole 101 is 100 mm larger than the radius of the pile foundation 2 to allow for position deviation of the pile sinking on water.

[0044] Embedded steel sections are arranged in the prefabricated pier module 1, and are connected to each other at the reserved holes 101. The transverse steel sections 102 are connected by welding, and the longitudinal steel sections 103 are bolted. At the same time, embedded bolts, lifting rings and other lifting accessories are arranged around the prefabricated pier module 1 to facilitate connection and traction during the later construction process.

[0045] The prefabricated pier structure replaces the traditional cast-in-place structure. A plastic bottom mold 301 is set at the bottom, wrapped to the position of the corbel 304. It has a simple structure and replaces the complex bottom mold support system at the bottom of the traditional cast-in-place pier, avoiding the safety and quality problems caused by the processes of water installation and dismantling of the cast-in-place support system in a confined space.

[0046] The reason why a plastic bottom form can be used here is determined by the pier structure in the present application. There is only a small amount of space at the bottom of the prefabricated pier module of the present invention that needs to be poured with UHPC, so only a simple device is needed as the bottom form to bear a smaller load, and the strength requirement for the bottom form does not need to be as high as that of a traditional bottom form. The traditional pier structure needs to bear the large-sized cast-in-place concrete on the upper part, so a bottom form made of steel with high enough strength is required, and a plastic bottom form cannot meet the requirement.

[0047] Among them, the bottom mold adopts a plastic bottom mold. Compared with the traditional bottom mold which is composed of a large number of steel sections and hoops, which is heavy and large in size, the present application adopts a plastic bottom mold, which reduces the weight and cost of the bottom mold of the entire pier structure, and greatly improves the convenience of later construction.

[0048] In another technical solution, the clamp 302 is connected to the hemispherical bottom mold 301 made of plastic through a reserved slot 303 .

[0049] In another technical solution, a rubber pad is arranged on the top of the hemispherical plastic bottom mold 301 to buffer the impact of the prefabricated pier and fill the gap caused by the uneven bottom surface of the prefabricated pier.

[0050] In another technical solution, the top elevation of the corbel 304 is the top elevation of the prefabricated pier installation.

[0051] A construction method of the assembled pier structure suitable for offshore wind turbine transportation is also provided, comprising the following steps:

[0052] S1, prefabricated pier module 1 is prefabricated in the factory;

[0053] S2, sink the pile foundation on the water in the on-site pier area, then weld at least 4 brackets 304 evenly around the top of the pile foundation, weld at least 2 pile inner steels 402 on the inner wall of the pile foundation 2, and install a hemispherical bottom mold 301 at the same time. The top of the bottom mold is flush with the top of the bracket 304, and a rubber pad is set. The bottom of the bottom mold is installed with a hoop 302, which is fixed to the pile foundation 2 by bolts, and finally the pile core steel cage 401 is placed inside the pile foundation 2;

[0054] S3, the pontoon 5 is tied to the bottom of the prefabricated pier abutment module 1, and after being transported to the construction area by ship, it is floated to the water surface with the help of the pontoon 5, and the prefabricated pier abutment module 1 is floated to the water area where the piles have been sunk by the tide, and the angle and position are adjusted by the traction devices around it. Then, as the tide level slowly decreases, the prefabricated pier abutment module 1 sinks, and the pile foundation 2 is gradually inserted into the reserved hole 101 of the prefabricated pier abutment module 1, completing the positioning of the prefabricated structure;

[0055] S4, such as Figure 6 and Figure 7 As shown, after the water level drops to a certain level, the prefabricated pier module 1 is completely placed on the top of the pile foundation 2. At this time, the embedded steel is placed on the top of the pile foundation, and the bottom of the prefabricated pier module 1 is placed on the top of the bracket 304. The prefabricated pier module 1 is completely supported by the pile foundation 2. Then, the extended steel bars inside the reserved holes of the prefabricated pier module are welded and connected to each other, and the extended steel bars are welded to the steel bars inside the pile.

[0056] S5, such as Figure 8As shown, the workers and pouring equipment pour UHPC grouting material between the corbel 304 and the bottom formwork, and between the embedded steel of the prefabricated pier module and the bottom formwork at the top of the prefabricated pier, and then pour and vibrate the pile core concrete and the pile top part with fine stone concrete 7 to complete the connection between the prefabricated pier and the pile foundation 2.

[0057] Among them, since the UHPC grouting material 6 has the characteristics of short initial setting time and early strength, after completing the grouting of multiple reserved holes 101 for a certain period of time, fine stone concrete 7 can be used to cast and vibrate the pile core concrete and the pile top part to complete the connection between the prefabricated pier module 1 and the pile foundation 2.

[0058] In the above technical solution, the prefabricated pier modules 1 are standardizedly produced in the factory, and the floating boxes 5 and related traction devices are used to complete the offshore assembly and installation of each module, avoiding the long operation cycle and environmental pollution caused by the offshore concrete pouring operation, and realizing the rapid and green construction of the wind turbine transfer platform. Among them, the mutual spacing of the floating boxes 5 should reserve space according to the pile position conditions to avoid mutual interference between the pile foundation 2 and the floating boxes 5 during positioning.

[0059] Moreover, in S4, the workers and related equipment can stand on the top of the prefabricated pier to weld the steel bars and steel sections on the top of the prefabricated pier, thus avoiding offshore operations.

[0060] The prefabricated pier structure is floated and positioned as a modular whole at sea by means of the rise and fall of the tide. When the tide is high, the pontoon 5 is used to float it to the water area of ​​the pile foundation 2. When the tide is low, the prefabricated pier structure is completely placed on the pile top by arranging embedded steel in the reserved hole 101 and welding the bracket 304 on the pile top to complete the positioning and installation. The use of large-scale ship machinery and equipment is reduced, and the economic benefits of the project are improved.

[0061] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation modes, and they can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the illustrations shown and described herein.

Claims

1. An assembled pier structure suitable for offshore wind turbine transportation, characterized in that: include: A prefabricated pier module is provided with a reserved hole running through it from top to bottom, and embedded steel is arranged at the reserved hole. The embedded steel includes a transverse steel and a longitudinal steel. One end of the embedded steel is anchored inside the reinforced concrete structure of the prefabricated pier module, and the other end is welded or bolted at the reserved hole. The transverse steel runs through the reserved hole transversely, and the longitudinal steel runs through the reserved hole longitudinally. Outrigger steel bars are horizontally arranged on the inner wall of the reserved hole of the prefabricated pier module. The pile foundation has a pile core steel cage inside, and the inner wall of the top of the pile foundation is welded vertically evenly around the pile inner steel. The pile foundation is located below the prefabricated pier module, and the pile core steel cage and the pile inner steel extend upward through the reserved hole to the outwardly extending steel bars of the prefabricated pier module; Corbels, at least four of which are evenly welded around the outer wall of the pile foundation at a certain distance from the top of the pile foundation, the bottom of the prefabricated pier module is placed on the corbels, and the embedded steel inside the prefabricated pier module is placed on the top of the pile foundation at the same time; The bottom mold is a hemispherical structure, the bottom mold is annularly sleeved outside the pile foundation, and a hoop is provided at the bottom of the bottom mold; The space in the reserved hole of the prefabricated pier module, excluding the pile foundation and below the top of the pile foundation, is filled with UHPC grouting material, and the space above the top of the pile foundation and inside the pile core is filled with fine stone concrete.

2. The assembled pier structure suitable for offshore wind turbine transportation according to claim 1 is characterized in that: The clamp is connected to the bottom mold through a reserved slot.

3. The assembled pier structure suitable for offshore wind turbine transportation according to claim 1 is characterized in that: A rubber pad is arranged on the top of the bottom mold.

4. The assembled pier structure suitable for offshore wind turbine transportation according to claim 1 is characterized in that: The corbel top elevation is the bottom elevation for installation of the prefabricated pier module.

5. The construction method of the assembled pier structure suitable for offshore wind turbine transportation according to any one of claims 1 to 4, characterized in that: The following steps are involved: S1. The prefabricated pier modules are prefabricated in the factory; S2. The pile foundation is sunk in the on-site pier area, and then at least 4 brackets are evenly welded around the top of the pile foundation, and at least 2 pile inner steels are welded on the inner wall of the pile foundation. At the same time, a hemispherical bottom mold is installed. The top of the bottom mold is flush with the top of the bracket, and a rubber pad is set. A hoop is installed at the bottom of the bottom mold, and the hoop is fixed to the pile foundation by bolts. Finally, the pile core steel cage is lowered inside the pile foundation; S3. The pontoon is tied to the bottom of the prefabricated pier abutment module. After being transported to the construction area by ship, it is floated to the water surface with the help of the pontoon. The prefabricated pier abutment module is floated to the water area where the piles have been sunk by the tide. The angle and position are adjusted by the traction devices around it. Then, as the tide level slowly decreases, the prefabricated pier abutment module sinks, and the pile foundation is gradually inserted into the reserved hole of the prefabricated pier abutment module to complete the positioning of the prefabricated structure; S4, after the water level drops to a certain level, the prefabricated pier module is completely placed on the top of the pile foundation, the embedded steel is placed on the top of the pile foundation, the bottom of the prefabricated pier module is placed on the top of the bracket, the prefabricated pier module is completely supported by the pile foundation, and then the extended steel bars inside the reserved holes of the prefabricated pier module are welded and connected to each other, and the extended steel bars are welded to the steel bars inside the pile; S5. Pour UHPC grouting material between the corbel and the bottom formwork, and between the embedded steel and the bottom formwork of the prefabricated pier module, and then use fine stone concrete to cast and vibrate the pile core concrete and the pile top to complete the connection between the prefabricated pier and the pile foundation.

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