CN108930637A - A kind of offshore boosting station jacket basis - Google Patents

Abstract

The present invention relates to Construction of Wind Power technical fields, and in particular to a kind of offshore boosting station jacket basis, comprising: infrastructure, bottom end are fixed in sea bed, and the part inside the infrastructure beyond sea level is integrated with cable floor.Offshore boosting station jacket basis provided by the invention, each collection electric line can be carried out after the completion of foundation construction and sends out the Landing Construction of sea cable, while can optimize the construction organization efficiency of Construction of Wind Power from the processes such as blower foundation construction, blower lifting construction, submarine cable operation.

Description

Jacket foundation of an offshore booster station

technical field

The invention relates to the technical field of wind farm construction, in particular to a jacket foundation of an offshore booster station.

Background technique

The offshore booster station includes the upper block and the lower foundation. The upper block has many constraints in its design, manufacture, construction and installation, while the lower foundation has fewer constraints and can be completed quickly. At present, the foundations of my country's offshore booster stations can be divided into single pile foundations, underwater pile-first method direct insertion jacket foundations, underwater back-pile method pile-shoe jacket foundations, and underwater back-pile method supported jacket foundations. etc., usually only berthing and J-tube structures are integrated on the foundation. There will be a 13-18m submarine cable after each collector line and the J-tube of the submarine cable landing booster station. If this part of the submarine cable is temporarily fixed on the traditional jacket (at the same time, the minimum bending radius of the submarine cable must be met ), it will also interfere with it when the upper block of the booster station is hoisted. Therefore, after the foundation construction of the traditional booster station is completed, the integrated lines and outgoing submarine cables will not meet the conditions for landing the booster station and laying the submarine cable on the cable layer. The foundation of each wind turbine and the organization of wind turbine installation and construction bring adverse effects, thereby affecting the progress of wind farm grid-connected power generation, and seriously damaging economic interests.

Contents of the invention

Therefore, the technical problem to be solved by the present invention is to overcome the problem that each integrated line and sending out submarine cable do not have the construction of landing booster station and submarine cable laying construction on the cable layer after the offshore booster station in the prior art has completed the construction of the lower foundation. In order to provide a jacket foundation for the offshore step-up station that can carry out the landing construction of the integrated lines and the outgoing submarine cable after the completion of the lower foundation construction, and the submarine cable can be anchored to the cable layer after landing.

In order to solve this problem, the invention discloses a jacket foundation of an offshore booster station, comprising:

The bottom of the lower foundation is fixed in the seabed, and the part of the lower foundation above the sea level is integrated with a cable layer.

The cable layer is located inside the lower foundation near the top.

The cable layer extends from the center of the plane in a direction away from the lower foundation until it exceeds the lower foundation.

The lower part of the periphery of the cable layer extending out of the lower foundation is provided with several support members, and the other ends of the support members are fixed on the lower foundation.

The supporting member is an oblique rod whose two ends are fixedly connected to the lower surface of the cable layer and the side wall of the lower foundation respectively.

The included angle between the inclined rod and the cable layer is 30-70°.

A structural support layer is arranged inside the lower foundation and above the cable layer.

The structural support layer is embedded within the lower foundation.

The lower foundation is composed of several welded steel pipes, a J-shaped pipe is arranged between two adjacent horizontally arranged steel pipes, and the top of the J-shaped pipe is located in the cable layer.

The cable layer is also provided with a submarine cable anchoring device, a submarine cable support, a lifesaving device and an oil-water separation device.

The technical solution of the present invention has the following advantages:

1. The jacket foundation of the offshore booster station provided by the present invention has a cable layer integrated in the part of the lower foundation that exceeds the sea level, so that after the completion of the lower foundation construction, the landing construction of each power collecting line and sending out submarine cable can be carried out. It enables the submarine cable to be anchored to the cable layer after landing, reducing the working time of the submarine cable at sea, thereby speeding up the progress of wind farm grid-connected power generation, and at the same time optimizing wind power in terms of wind turbine foundation construction, wind turbine hoisting construction and submarine cable construction. Improve the construction organization efficiency of field construction and obtain better economic benefits.

2. In the jacket foundation of the offshore step-up station provided by the present invention, a number of supports are arranged at the lower part of the periphery where the cable layer extends out of the lower foundation, and the other end of the support is fixed on the lower foundation. This makes the connection between the cable layer and the underlying foundation more stable, and at the same time improves the mechanical performance of the cable layer.

3. The jacket foundation of the offshore step-up station provided by the present invention also includes a structural support layer arranged inside the lower foundation and above the cable layer. This makes the structure of the part of the lower foundation above the cable layer more stable.

4. The jacket foundation of the offshore step-up station provided by the present invention, the lower foundation is composed of several steel pipes welded to each other, a J-shaped pipe is arranged between two adjacent horizontal steel pipes, and the top of the J-shaped pipe is located in the cable layer . The submarine cable can be anchored on the submarine cable support in the submarine cable layer after passing through the J-shaped pipe, which makes the construction more convenient.

5. The jacket foundation of the offshore step-up station provided by the present invention is also provided with a submarine cable anchoring device, a submarine cable support, a lifesaving device and an oil-water separation device on the cable layer. In this way, the offshore booster station also has the requirements for escape and lifesaving and basic rescue during construction and on-site operation, the requirements for oil discharge in the main transformer accident state during on-site operation, and the hoisting requirements for basic operation and maintenance tools when the operation and maintenance ship is docked, etc. .

Description of drawings

In order to more clearly illustrate the specific implementation of the present invention or the technical solutions in the prior art, the following will briefly introduce the accompanying drawings that need to be used in the specific implementation or description of the prior art. Obviously, the accompanying drawings in the following description The drawings show some implementations of the present invention, and those skilled in the art can obtain other drawings based on these drawings without any creative work.

Fig. 1 is the basic schematic diagram of the offshore step-up station provided in the first embodiment of the present invention;

Fig. 2 is a top view of the cable layer in Fig. 1 .

Explanation of reference signs:

1. Cable layer 2. Structural support layer 3. Sea level 4. Sea bed

5. J-tube 6. Submarine cable 7. Support 8. Jacket 9. Steel pipe pile

11. Submarine cable anchoring device 12. Submarine cable support 13. Hoisting area

14. Anti-theft cage 15. External lifesaving ladder 16. Lifeboat

17. Rescue station 18. Stairs 19. Oil-water separation device

10. Accident oil tank 20. Assembly area 30. Grille 40. Life raft

Detailed ways

The technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are part of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as there is no conflict with each other.

A specific implementation of the jacket foundation of the offshore step-up station as shown in Figures 1 and 2, includes a lower foundation, the bottom end of which is fixed in the seabed 4, and the part of the lower foundation that exceeds the sea level 3 is integrated with a cable layer 1.

For the jacket foundation of the above-mentioned offshore step-up station, after the construction of the lower foundation is completed, the landing construction of the collection lines and the outgoing submarine cable can be carried out, which reduces the working time of the submarine cable 6 at sea, thereby speeding up the progress of wind farm grid-connected power generation , and at the same time, it can optimize the construction organization efficiency of wind farm construction from the wind turbine foundation construction, wind turbine hoisting construction and submarine cable construction and other processes to obtain better economic benefits.

Specifically, the lower foundation may be a single-pile foundation with a transition section, an underwater pile-first method directly inserted jacket foundation, an underwater post-pile method spud-shoe jacket foundation, or an underwater post-pile method supported jacket foundation, etc. . As shown in FIG. 1 , the bottom of the lower foundation can be embedded into the seabed 4 through steel pipe piles 9 to ensure firmness and reliability of construction.

As a specific implementation manner, the above-mentioned cable layer 1 is located inside the lower foundation near the top. Specifically, the cable layer 1 is located above the sea level 3, and its elevation needs to meet the relevant requirements of fixed offshore platforms such as tide level changes, extreme wave heights, and air gaps during the in-position period.

The above-mentioned cable layer extends from the center of the plane where it is located in a direction away from the lower foundation until it exceeds the lower foundation. That is, the cross-sectional area of the cable layer is greater than the cross-sectional area of the corresponding lower foundation of the plane, so as to increase the load-bearing area of the cable layer 1 and facilitate the laying of other necessary devices on its upper part.

In order to further improve the seismic performance and structural stress strength of the cable layer, several support members 7 are arranged at the lower part of the periphery of the lower foundation extending from the above-mentioned cable layer 1, and several support members 7 are evenly distributed in the circumferential direction of the lower foundation. The other end of the support member 7 is fixed on the lower foundation. Specifically, the above-mentioned support member 7 is a steel structure oblique rod whose two ends are respectively welded to the lower surface of the cable layer 1 and the side wall of the lower foundation. The welding can be pre-finished in the factory to reduce construction difficulty and improve construction efficiency . The included angle between the above-mentioned oblique rod and the cable layer 1 is 30-70°.

Inside the above-mentioned lower foundation, and above the cable layer, a structural support layer 2 is arranged. The construction support layer 2 is embedded inside the lower foundation. Constructing the support layer 2 can make the structure of the lower foundation above the cable layer 1 more stable.

The above-mentioned lower foundation is a jacket 8 composed of several mutually welded steel pipes. The several steel pipes include several vertical steel pipes, several horizontal steel pipes and inclined pipes for connecting vertical steel pipes and horizontal steel pipes at the same time. Two adjacent inclined pipes are arranged crosswise. , to improve the overall firmness and stability of the lower foundation. A J-shaped pipe 5 is arranged between two adjacent horizontally arranged steel pipes, and the top end of the J-shaped pipe 5 is located in the cable layer 1 .

In this way, after the submarine cable 6 passes through the J-shaped pipe 5 and lands, it can be anchored to the cable layer 1, and the main cable and the optical cable can be fixed on the submarine cable support 12 after the submarine cable 6 is divided. While meeting the bending radius requirements, it also meets the minimum workload for connecting the main submarine cable with the main transformer and GIS after the upper block is hoisted in place.

The cable layer is also provided with a submarine cable anchoring device 11 , a submarine cable support 12 , a lifesaving device and an oil-water separation device 19 . In this way, the jacket foundation of the offshore booster station in this embodiment has the requirements for escape from life and rescue and basic rescue during the construction of the offshore booster station and on-site operation, the requirements for oil discharge in the main transformer accident state during the on-site operation, and the requirements for when the operation and maintenance ship is docked. Basic operation and maintenance tools hoisting requirements, etc. Specifically, the integrated cable layer can be designed for the following components: submarine cable anchoring device 11, submarine cable support 12, oil-water separation device 19, emergency oil tank 10, life raft 40, lifeboat 16, assembly area 20, hoisting area 13 , anti-theft cage 14, rescue station 17, external lifesaving ladder 15, stairs 18, grille 30 and crane, etc., but not limited to others.

The cable layer 1 of the upper block of the traditional step-up station is at the bottom, but the load of the cable layer 1 itself is small, but at the same time it needs to bear the load of about 2500t above the cable layer 1, resulting in an increase in the structural weight of the cable layer 1. In this embodiment, because the cable layer 1 is moved down to the lower foundation of the booster station for integrated design, the structure of the cable layer 1 does not need to bear about 2600t-3000t of the upper block (the weight of the cable layer has been removed) during construction, transportation and Under the in-situ load, the added weight of the steel structure in the lower foundation is far less than the reduced weight of the upper block.

As an alternative embodiment, the support member 7 may also be a slant plate whose two ends are respectively fixed to the lower surface of the cable layer 1 and the side wall of the lower foundation.

Apparently, the above-mentioned embodiments are only examples for clear description, rather than limiting the implementation. For those of ordinary skill in the art, other changes or changes in different forms can be made on the basis of the above description. It is not necessary and impossible to exhaustively list all the implementation manners here. And the obvious changes or changes derived therefrom are still within the scope of protection of the present invention.

Claims (10)

1. A jacket foundation of an offshore step-up station, characterized in that it comprises: The bottom of the lower foundation is fixed in the seabed (4), and a cable layer (1) is integrated in the part of the lower foundation that exceeds the sea level (3). 2. The jacket foundation of the offshore step-up station according to claim 1, characterized in that the cable layer (1) is located inside the lower foundation near the top. 3. The jacket foundation of the offshore step-up station according to claim 1 or 2, characterized in that the cable layer (1) extends from the center of the plane where it is located to a direction away from the lower foundation until it exceeds the lower Base. 4. The jacket foundation of the offshore step-up station according to claim 3, characterized in that, several support members (7) are arranged at the lower part of the periphery of the lower foundation extending from the cable layer, and the support members (7) ) is fixed on the lower foundation. 5. The jacket foundation of the offshore step-up station according to claim 4, characterized in that, the support (7) is connected to the lower surface of the cable layer (1) and the side of the lower foundation at both ends respectively. Wall-fixed diagonal rods. 6 . The jacket foundation of the offshore step-up station according to claim 5 , wherein the angle between the inclined rod and the cable layer is 30-70°. 7. The jacket foundation of the offshore step-up station according to any one of claims 1-6, characterized in that it also includes a structural support layer (2) arranged inside the lower foundation and above the cable layer . 8. The jacket foundation of the offshore step-up station according to claim 7, characterized in that, the structural support layer (2) is embedded inside the lower foundation. 9. The jacket foundation of the offshore step-up station according to any one of claims 1-8, characterized in that, the lower foundation is composed of several mutually welded steel pipes, and the gap between two adjacent horizontally arranged steel pipes is A J-shaped tube (5) is provided, and the top end of the J-shaped tube (5) is located in the cable layer (1). 10. The jacket foundation of the offshore step-up station according to any one of claims 1-9, characterized in that, a submarine cable anchoring device (11), a submarine cable support (12), a lifesaving device and oil-water separation device (19).