CN204676584U - A kind of high stake truss-like offshore wind turbine foundation structure - Google Patents

Abstract

The utility model relates to a foundation structure of a high pile truss type offshore fan. The purpose of the utility model is to provide a high-pile truss-type offshore fan foundation structure with simple structure, safety and reliability, and easy construction, aiming at improving the stress of the jacket nodes and reducing the difficulty of grouting construction. The technical solution of the utility model is: a high-pile truss-type offshore fan foundation structure, characterized in that: the foundation structure is composed of an upper steel truss and a lower pile foundation, and the pile foundation is a group of piles driven into the seabed steel pipe pile; the steel truss includes a main cylinder vertically located in the center of the steel pipe pile group and a pile casing inserted into the steel pipe pile, and three groups of cross-arranged pipes are welded on the outer wall of the main cylinder with the center of the circle as the center Diagonal braces, the braces in the same position in the three sets of braces are connected end to end, one end of each brace is welded to the main cylinder, and the other end is welded to the pile casing; the gap between the steel pipe pile and the pile casing overlaps through grouting connect. The utility model is suitable for the offshore wind power generation industry.

Description

A high pile truss type offshore wind turbine foundation structure

technical field

The utility model relates to a high-pile truss type offshore wind turbine foundation structure, which is suitable for the offshore wind power generation industry.

Background technique

Offshore wind power generation is a power generation method that uses wind turbines to convert wind energy into electrical energy. It is a new energy source with high power density, stable energy, and strong regularity.

At present, the common domestic offshore wind power foundation structures are mostly pile foundations, including single pile foundations, multi-pile jacket foundations and high pile cap foundations. The upper jacket of the conventional multi-pile jacket foundation type is located near the sea level, and is subjected to large wave and current loads, and the pile foundation is subjected to a large force, and the steel nodes are easily damaged under the long-term action of dynamic loads such as wind, waves, and currents. Fatigue damage or even failure occurs; at the same time, the underwater grouting connection design is not only difficult to guarantee the performance of the grouting material itself, but also the construction process is more difficult. Once the grouting connection is damaged, it will directly affect the overall service life of the structure.

Contents of the invention

The technical problem to be solved by the utility model is to provide a high-pile truss-type offshore fan foundation structure with simple structure, safety and reliability, and easy construction in view of the above-mentioned problems, aiming at improving the stress on the jacket nodes and reducing the grouting. difficulty of construction.

The technical scheme adopted by the utility model is: a high-pile truss-type offshore wind turbine foundation structure, which is characterized in that: the foundation structure is composed of an upper steel truss and a lower pile foundation, and the pile foundation is a group of piles driven into the sea. The steel pipe pile in the bed; the steel truss includes a main cylinder vertically located in the center of the steel pipe pile group and a pile casing inserted in the steel pipe pile, and three sets of cross-sections are welded on the outer wall of the main cylinder as the center of the circle. Arranged diagonal braces, the braces in the same position in the three sets of braces are connected end to end, one end of each brace is welded to the main cylinder, and the other end is welded to the pile casing; the gap between the steel pipe pile and the pile casing overlaps Connected by grout.

Each group of diagonal braces is composed of three struts that are evenly distributed at 120°. The first group of diagonal braces slopes downward from the inside to the outside, the second group of diagonal braces slopes upward from the inside to the outside, and the third group of diagonal braces slopes downward from the inside to the outside.

The beneficial effects of the utility model are: 1. Under the same tidal level condition, the utility model lifts the upper steel structure out of the range of wave action, reduces the wave current load, thus reduces the requirement for structural strength and reduces the amount of steel used , at the same time, the higher foundation top surface elevation shortens the length of the fan tower and reduces the investment in fan equipment, thereby saving engineering investment and improving economic benefits of the project; The grouting construction can be carried out by simply pumping water to clear the hole, which is convenient for construction, short in cycle and saves ship machinery and equipment.

Description of drawings

Fig. 1 is a sectional view of the utility model.

Fig. 2 is the plan view of the utility model.

Detailed ways

As shown in Figures 1 and 2, this embodiment is a high-pile truss type offshore wind turbine foundation structure, which is composed of an upper steel truss and a lower pile foundation, and the upper and lower parts are connected by grouting.

The pile foundation of the lower part is made up of three steel pipe piles 7 vertically driven into the seabed.

The upper steel truss consists of a main cylinder 1 vertically arranged above the centers of the three steel pipe piles 7, and a pile casing 5 vertically inserted into the upper ends of the steel pipe piles 7 (the overlap between the pile casing 5 and the steel pipe pile 7 Part of it is the grouting connection section 6, which is connected by grouting), three sets of cross-arranged diagonal braces welded between the main cylinder 1 and the pile casing 5 (composed of the first diagonal brace 2, the second diagonal brace 3, the second diagonal brace Three diagonal braces are connected end to end); among them, the braces in the same position in the three sets of braces are connected end to end, one end of each brace is welded to the outer wall of the main cylinder 1, and the other end is connected to the pile casing 5 Welding; each group of diagonal braces has three braces that are evenly distributed at 120°. The first group of diagonal braces slopes downward from the inside to the outside, the second group of diagonal braces slopes upward from the inside to the outside, and the third group of diagonal braces slopes downward from the inside to the outside. Slant (the specific form is that the two ends of the second slant 3 are respectively connected with the tail of the first slant 2 and the head of the third slant 4, which is an inclined Z-shaped, that is, the first slant 2 is from the inside to the The outside slopes downward, the second diagonal brace 3 slopes upward from the inside to the outside, and the third diagonal brace 4 slopes downward from the inside to the outside).

In this embodiment, the welding flange at the top of the main cylinder 1 is connected to the upper fan tower, the central diameter of the main cylinder is determined according to the diameter of the upper fan tower, and the root opening width of the steel truss structure (that is, the distance between the two steel pipe piles) Determined according to the fan load, wave current load, terrain and geological conditions and pile diameter and pile length, the lower diameter of the main cylinder 1, the diameter of each diagonal brace, the height of the upper steel truss and the wall thickness of each steel pipe shall be determined according to the fan load, wave current load and water depth. The situation is determined, the pile diameter and wall thickness of the steel pipe pile 7 must be determined according to the fan load, wave current load, topographic and geological conditions, and the distribution of the pile body bending moment, and the exposed length of the pile casing 5 must be determined according to the first set of diagonal braces and the second set of braces. The inclination between the three sets of braces is determined, and the length of the grouting connection (that is, the length of the grouting connection section 6) needs to be calculated and determined according to the mechanical performance of the grouting material and the stress of the grouting section.

The concrete construction method of this embodiment is as follows:

1. Drive three steel pipe piles 7 with a pile diameter of 2.4m and a length of 66m into the seabed. Professional piling ships or cranes are used for pile sinking operations. Before piling, a detailed survey of the seabed terrain is required. If there are obstacles that affect the construction, sea sweeping should be carried out in advance; considering the size limit of the upper steel truss, it must be strictly Control the pile sinking accuracy to meet the steel truss sinking requirements.

2. After the pile sinking construction is completed, use a large crane to sink the upper steel truss. The root opening of the steel truss is 26m and the height is 27m. The leveling treatment method and grouting control of the truss structure are the difficulties in the construction of this foundation type. At present, special leveling devices are mainly used for leveling in foreign countries. Domestically, the hydraulic system is used for precise leveling with reference to offshore drilling platforms.

3. The pile casing 5 of the steel truss and the steel pipe pile 7 are connected by grouting. After the grouting material is cured, it bears the upper load and the influence of the underwater corrosive environment. The performance of the grouting material is high, and it is recommended to use a more mature one. Marine engineering grouting material.

The above-mentioned embodiments are mainly applied to high-pile truss foundation structures of offshore wind power, but not limited thereto. For other steel truss structures involved in offshore wind power foundations, the effect of wave action can also be reduced by elevating the upper steel structure. No matter what type of offshore wind turbine foundation structure, as long as the foundation structure "uses steel truss sleeves inserted into the pile foundation, and the upper steel structure towers above the range of wave action", it falls within the scope of protection of the present invention.

Claims (2)

1. A high-pile truss type offshore wind turbine foundation structure, characterized in that: the foundation structure is composed of an upper steel truss and a lower pile foundation, and the pile foundation is a group of steel pipe piles driven into the seabed (7 ); the steel truss includes a main cylinder (1) vertically positioned at the center of the steel pipe pile group and a pile casing (5) inserted in the steel pipe pile (7), with the main cylinder (1) as the center Weld three sets of cross-arranged diagonal braces on its outer wall, the braces in the same position in the three groups of braces are connected end to end, one end of each brace is welded to the main cylinder (1), and the other end is welded to the pile sleeve (5) ; The steel pipe pile (7) is connected by grouting in the gap of the overlapping part of the pile casing (5). 2. The high-pile truss-type offshore wind turbine foundation structure according to claim 1, characterized in that: each group of diagonal braces is composed of three braces that are evenly distributed at 120°, the first group of diagonal braces slopes downward from the inside to the outside, and the second group of diagonal braces The first group of diagonal braces slope upward from the inside to the outside, and the third group of diagonal braces slope downward from the inside to the outside.