CN204803864U - Marine booster stations structure in flange formula single pile basis - Google Patents

Abstract

The utility model relates to a marine booster stations structure in flange formula single pile basis. The utility model aims at providing a safety, high efficiency, environmental protection, expense are low, construction convenience, reduction of erection time, and are fit for the marine booster stations structure in flange formula single pile basis of the depth of water within 30m, reasonable solution changeover portion cantilever beam stress concentration problem to and the main transformer oil leak accident oil tank scale of construction is great, requires fire and explosion protection, arranges the great problem of the degree of difficulty. The utility model provides a: the upper portion chunk in transition conversion section top is connected including executing single steel pipe squeezing into following the supporting course of sea bed, installing in the transition conversion section at single steel pipe top and grout to the structure of these sea booster stations, and single steel pipe top is equipped with the flange, and the main barrel body of cavity is taken for vertical layout to transition conversion section main part, and main barrel body inside is provided with the accident oil tank, have bottom the main barrel body with last flange assorted lower flange, adopt bolted connection between lower flange and the last flange.

Description

Structure of Offshore Booster Station with Flange Single Pile Foundation

technical field

The utility model relates to a flange-type single-pile foundation offshore booster station structure, which is suitable for marine engineering fields such as offshore wind power generation.

Background technique

In my country, offshore wind power generation is an emerging industry. After 2007, my country began to gradually develop the offshore wind power industry. my country's offshore wind power industry is still in its infancy. At present, the domestic offshore wind farms that have been built send the electric energy generated by wind turbines to the land, and then send it to the power grid after being boosted by the land booster station. With the development of offshore wind power generation technology in China, offshore wind farms are getting farther and farther offshore, and the scale of wind farms is getting bigger and bigger. The traditional way of setting up booster stations on land is due to the large loss of low-voltage transmission lines and the copper material The consumption is high and the cost is high, so it is no longer suitable. In order to safely, reliably and economically send the electric energy generated by the offshore wind farm to the inland, it is necessary to set up an offshore booster station at sea. The offshore step-up station is to boost the electric energy generated by the wind turbine to 110kV, 220kV or higher, and then send it to the land through the high-voltage submarine cable, and then send it to the inland power grid through the high-voltage overhead line.

At present, there is no offshore booster station platform in China, and there are many offshore booster stations in foreign countries (some offshore booster stations use single-pile foundations). The steel pipe piles are connected as a whole. Although the performance of the high-strength grouting material can meet the operation requirements of the foundation of the offshore booster station, judging from the current operation effect of the single pile foundation abroad, there will still be situations such as surface cracking of the grouting material and separation from the steel pile. , which brings potential safety hazards to the structural performance of the offshore booster station; the overseas single-pile foundation offshore booster station is an early project, the upper block is small in size and light in weight (generally below 800t), and the transfer structure of the transition section adopts a cantilevered "worker". "Word steel or square steel beams, as the volume of the upper block increases, the weight increases, the stress on the cantilever beam structure increases, and the stress concentration is obvious. This type of transition section structure is no longer applicable; The transformer room is used as an oil leakage storage pit. This method cannot meet the domestic fire protection requirements. In China, it is necessary to arrange the main transformer oil leakage accident oil tank. The accident oil tank has a large volume and requires fire and explosion protection. With the large-scale development of offshore wind power construction in my country, the demand for the construction of offshore booster stations has increased sharply. It is necessary to seek a safe, efficient, environmentally friendly, low-cost, reasonable solution to the stress concentration of cantilever beams in the transition section and the layout of accidental oil tanks, and convenient construction. The structural type and installation method are very urgent.

Contents of the invention

The technical problem to be solved by the utility model is: aiming at the above existing problems, to provide a safe, efficient, environmentally friendly, low cost, convenient construction, shortened construction period, and suitable for sea boosting of flanged single pile foundations with a water depth of less than 30m The station structure can reasonably solve the stress concentration problem of the cantilever beam in the transition section, and the oil tank of the main transformer oil leakage accident has a large volume, requires fire protection and explosion protection, and is difficult to arrange.

The technical scheme adopted by the utility model is: a structure of a flange-type single-pile foundation offshore booster station, including a single steel pipe driven into the bearing layer below the seabed, and a transition section installed on the top of the single steel pipe The upper block connected with grouting above the transition transition section is characterized in that: the top of the single steel pipe is provided with an upper flange, the main body of the transition transition section is a main cylinder with a cavity arranged vertically, and the main cylinder There is an emergency oil tank inside, and the bottom of the main cylinder has a lower flange matching the upper flange; the lower flange and the upper flange are connected by bolts.

The single steel pipe is composed of a steel pipe column with variable diameter, an upper flange and an auxiliary structure welded or screwed on the side of the steel pipe column. The auxiliary structure includes anti-collision facilities for berthing, cable protection pipes and ladders.

The upper part of the main cylinder of the transition transition section is horizontally installed with several radially distributed cross braces, and the suspended ends of the cross braces are connected with the vertically arranged grouting tank supports; the bottom of the grouting tank supports is connected to the inclined The diagonal braces installed on the outside of the main cylinder are connected; the horizontal braces and the diagonal braces are all made of hollow round steel pipes or square steel.

The upper block adopts a steel frame structure, with a helicopter platform on the top and several supporting main columns on the bottom. Electrical, fire-fighting and life-saving and HVAC equipment are arranged internally, and outfitting is considered.

The pile head of the single steel pipe is above the extreme high water level.

The beneficial effects of the utility model are: 1. Compared with the jacket-type offshore booster station, the small and medium-sized offshore booster station (single main transformer) adopts the single-pile offshore booster station, which is more convenient for construction and saves operating time for large-scale offshore equipment At least 50% or more, good economic performance; 2. Compared with the grouted single pile foundation offshore booster station, the transition section and the single pile are connected by flanges, which avoids the sea rise caused by the surface cracking of the grouting material and the separation from the steel pile. Hidden dangers in the operation of the press station, the transition section does not need to be connected with the steel pile grouting section, the steel consumption is less, and the operation time of large offshore equipment is saved by at least 30%, and the economy is better; The structure adopts a triangular support conversion structure composed of beams and inclined beams, which avoids the problem of stress concentration in the transition section and can be used in larger offshore booster stations; 4. Arrange emergency oil tanks in the cavity of the transition section without additional The installation of construction oil tanks solves the problems of large volume of accident oil tanks, fire and explosion protection, and difficulty in layout, saving space and steel consumption; Recyclable, economical and environmentally friendly.

Description of drawings

Fig. 1 is a schematic diagram of a single steel pipe pile driven into the seabed of the present invention.

Fig. 2 is a schematic diagram of the transportation of the transition section and the upper block of the utility model.

Fig. 3 is a schematic diagram of the utility model after the transition section is installed on the single steel pipe pile.

Fig. 4 is a schematic diagram of the on-site installation of the offshore booster station of the present invention.

Detailed ways

As shown in Figure 4, this embodiment is a flanged single-pile foundation offshore booster station, which includes a single steel pipe 1 driven into the bearing layer below the seabed, connected to the single-pile via an upper flange 4 and a lower flange 5 The transition section 2 on the top of the root steel pipe, and the upper block 3 connected by grouting above the transition section.

As shown in Figure 1, a single steel pipe 1 is composed of a steel pipe column 7 with variable diameter, an upper flange 4 welded on the top of the steel pipe column 7, and an auxiliary structure 8. The diameter, wall thickness and length of the steel pipe column 7 are based on marine geology, marine Calculated from factors such as hydrology; the auxiliary structure 8 can be welded or screwed to the side of the steel pipe column 7 according to the site conditions, and the auxiliary structure includes anti-collision facilities for berthing, cable protection pipes and ladders.

As shown in Figure 3, the transition transition section 2 is composed of a main cylinder body 9 with a cavity, a cross brace 10, a diagonal brace 11, a grouting tank support 12, a bottom flange 5 at the bottom of the main cylinder body and arranged on the main cylinder body. 9 is composed of the emergency oil tank 13 inside, wherein, the cross braces 10 are installed horizontally on the upper part of the main cylinder 9 and are radially distributed, and the ends connect with the side of the vertically arranged grouting tank support 12, and the diagonal braces 11 are inclined Installed on the outside of the main cylinder 9, the end is connected with the bottom of the grouting tank support 12; the cross brace 10 and the diagonal brace 11 are both hollow round steel pipes or square steel.

As shown in Figure 4, the upper block 3 adopts a steel frame structure, the top is provided with a helicopter platform 14, and the bottom is provided with four supporting main columns 15 to support the entire upper block 3, and the column foot of the main column (so as to embed the transition section 2) to match the grouting tank support 12 of the transition section 2, the supporting main column 15 and the grouting tank support 12 are connected by grouting; HVAC equipment, etc., and consider outfitting.

The installation process of this embodiment is as follows: First, after a single steel pipe 1 is consigned by barge or floated by tugboat to the site, it is driven into the bearing layer below the seabed with a large hydraulic hammer or vibratory hammer, taking into account anti-corrosion and the upper flange 4 and For the connection of the lower flange 5, the pile head of the single steel pipe 1 needs to be higher than the extreme high water level; The front and rear hoisting construction of block 3 can be seamlessly connected, and the transition conversion section 2 and upper block 3 can be transported by a barge, which improves construction efficiency and reduces the time for large-scale equipment offshore operations), the transition conversion section 2 and upper block 3 are transported It needs to be fixed on the barge through the support; then the transition transition section 2 is hoisted on the single steel pipe 1, and the transition transition section 2 and the single steel pipe 1 are connected together by bolts by using the upper flange 4 and the lower flange 5, and the The upper block 3 is hoisted onto the grouting groove support 12 of the transition transition section 2, and the supporting main column 15 of the upper block 3 is inserted into the grouting groove support 12 of the transition transition section 2, and then poured into the grouting groove support 12 Cement-based grouting material or epoxy-based grouting material, until the grouting material meets the design strength requirements.

Claims (5)

1. A structure of a flange-type monopile foundation offshore booster station, including a single steel pipe (1) driven into the bearing layer below the seabed, a transition section (2) installed on the top of the single steel pipe and grouting The upper block (3) connected above the transition section is characterized in that: the top of the single steel pipe (1) is provided with an upper flange (4), and the main body of the transition section (2) is a vertically arranged strip The main cylinder (9) of the cavity is provided with an emergency oil tank (13) inside the main cylinder (9), and the bottom of the main cylinder has a lower flange (5) matching the upper flange (4); Bolt connection is adopted between the lower flange (5) and the upper flange (4). 2. The structure of the flange-type single-pile foundation offshore step-up station according to claim 1, characterized in that: the single steel pipe (1) is composed of a variable-diameter steel pipe column (7), an upper flange (4) It is composed of an auxiliary structure (8) welded or screwed on the side of the steel pipe column (7), and the auxiliary structure (8) includes ship-by-ship anti-collision facilities, cable protection pipes and climbing ladders. 3. The structure of the flange-type single-pile foundation offshore booster station according to claim 1, characterized in that: the upper part of the main cylinder (9) of the transition section (2) is horizontally installed with several radial Distributed cross braces (10), the suspended ends of the cross braces are connected to the vertically arranged grout groove support (12); the bottom of the grout groove support (12) is installed obliquely on the outside of the main cylinder (9) The diagonal braces (11) are connected; the horizontal braces (10) and the diagonal braces (11) all adopt hollow round steel pipes or square steel. 4. The structure of the flange-type monopile foundation offshore step-up station according to claim 3, characterized in that: the upper block (3) adopts a steel frame structure, the top is provided with a helicopter platform (14), and the bottom is provided with a There are several supporting main columns (15), and the column feet of the supporting main columns are matched with the grouting groove support (12) of the transition section (2) and connected by grouting. The upper block (3) is equipped with electrical and fire protection Lifesaving and HVAC equipment. 5. The structure of the flange type single pile foundation offshore step-up station according to claim 1, characterized in that: the pile head of the single steel pipe (1) is higher than the extremely high water level.