CN201506979U - A grouting connection structure between offshore wind turbine pile foundation and jacket leg columns - Google Patents

Abstract

The utility model relates to a grouting connection structure for a steel pipe pile foundation of an offshore fan and a jacket leg column, and belongs to the fields of marine engineering and wind power generation. The main technical scheme is: by grouting the annular space formed by the steel pipe pile and the jacket leg column, the upper load can be transmitted to the steel pipe pile through the grouting stone body; setting shear keys in the annular space to increase the grouting The ability of the connecting section to transfer load; guide bodies are set at the upper and lower parts of the annular space to facilitate the smooth insertion of steel pipe piles into the jacket leg columns during piling construction; blockers are installed at the top and bottom of the annular space to ensure smooth grouting. Cement-based high-strength non-shrinkage grouting material is selected as the grouting material. The stone body has high strength and reliable connection effect. The grout is injected from the grouting valve at the bottom of the annular space, and the grouting end standard is controlled through the grouting return valve at the upper part of the annular space. The utility model can effectively connect the whole section, does not apply external force and heat to the steel structure, and is easy to absorb component manufacturing errors and installation deviations; there is no special requirement for equipment, and the operation is simple, and it has been successfully applied in Jiangsu Xiangshui offshore wind measuring tower , which can be further promoted.

Description

A grouting connection structure between offshore wind turbine pile foundation and jacket leg columns

Technical field

The utility model relates to a grouting connection structure for a steel pipe pile foundation and a jacket leg column for an offshore fan foundation.

Background technique

Wind energy is a clean and renewable energy, and wind power generation is the main form of wind energy utilization. Offshore wind conditions are better than those on land, with less sea surface roughness, less wind turbulence intensity, less wind shear, stable dominant wind direction, and no occupation of land resources. Offshore wind power development will be an important direction for future wind power development. However, the development and utilization of offshore wind power is affected by offshore environmental conditions, and the construction and operation and maintenance of wind farms are much more difficult than land wind farms.

Offshore wind turbine foundations generally use steel pipe pile foundations, and the connection between the pile foundation and the wind turbine tower can be connected through a jacket structure. The jacket structure is a space frame composed of leg columns and tension pipes connected to the leg columns. Steel pipe piles are driven into the seabed through the leg columns to fix the jacket. The jacket structure is not affected by the model of the fan and the depth of seawater, and no special river bed cleaning is required before construction, and the construction process is simple.

Some European countries with relatively developed offshore wind power technology have carried out some research on the application of grouting connections between offshore wind turbine steel pipe pile foundations and jacket leg columns, and have carried out practical applications in some offshore wind farm projects. In my country, the development and utilization of offshore wind power is still in its infancy. The grouting connection between the pile foundation and the jacket leg columns is widely used in the construction of offshore platforms, and a certain amount of design and construction experience has been accumulated. The application of grouting connection in the foundation construction of offshore wind turbines requires full consideration of the structural characteristics of offshore wind turbines: the scale of the foundation of the wind turbine is smaller than that of the offshore platform; Combination of loads. Therefore, in order to ensure the normal operation and structural safety of offshore wind turbines, it is necessary to put forward higher requirements for the quality of the grouting connection between the pile foundation and the jacket leg column.

The grouting connection between the steel pipe pile foundation and the jacket leg column has its unique construction technology advantages, no special requirements for equipment, simple operation, and has accumulated certain construction experience in offshore platform engineering applications. By optimizing the grouting material, grouting construction process and annular space structure of the connecting section, the effect of the grouting connection of the connecting section is increased, and the grouting connection between the steel pipe pile foundation of the offshore fan and the jacket leg column is realized in the construction of offshore wind farms in China. It has important practical significance and great social and economic benefits.

Contents of the invention

The purpose of the present invention is to provide a transitional device for connecting the foundation of an offshore wind turbine to a tower, and a grouting connection structure between a steel pipe pile foundation and a jacket leg column.

Technical scheme of the present invention is:

A grouting connection structure between the pile foundation of an offshore wind turbine and the jacket leg column. An annular space is formed by the inner wall of the jacket leg column and the outer wall of the steel pipe pile of the pile foundation. Shear keys, guide bodies, and upper and lower blockers are arranged inside the annular space , the shear key is arranged circumferentially between the inner wall of the jacket leg column and the outer wall of the steel pipe pile, the guide body is located on the inner wall of the jacket leg column, the upper and lower blockers are respectively located at the top and bottom of the jacket, and the annular space is filled with cement-based High-strength non-shrink grouting material.

The shear key is uniformly welded along the outer wall of the steel pipe pile, and the shear key can be welded beads, fillet welded flat steel or fillet welded round steel.

The shear key is uniformly welded on both sides along the outer wall of the steel pipe pile and the inner wall of the jacket leg column. The shear key can be welded beads, fillet welded flat steel or fillet welded round steel.

The shear keys of the outer wall of the steel pipe pile and the inner wall of the jacket leg column are arranged in a staggered manner.

A grouting valve is arranged at the bottom of the annular space, and a slurry return valve is arranged at the upper part.

The width of the annular space is 40-50 mm, the height of the shear key is 6-8 mm, and the width of the shear key is 10-15 mm.

The grouting process adopts bottom grouting, that is, the annular space is grouted by the grouting valve at the bottom of the annular space, and the grouting end standard is judged by detecting the specific gravity of the backflow grout at the backflow valve.

In the project, it is preferred to set shear keys on both sides. When the shear keys cannot be set inside the jacket leg column due to the influence of the inner diameter, the shear keys can be set on one side on the outer wall of the steel pipe pile of the pile foundation.

The beneficial effects of the invention are:

1. The offshore wind turbine pile foundation and the jacket leg column are connected by grouting, which can transfer the upper load to the steel pipe pile through the grouting stone body, with reliable quality and simple operation.

2. The grouting connection has a flat and tight joint and an effective connection across the entire section. It does not apply external force and heat to the steel structure, and is suitable for connections with different surface shapes and different calibers.

3. There is a certain gap between the steel pipe pile foundation and the leg column, and the grouting connection is easy to absorb component manufacturing errors and installation deviations.

4. The grouting connection material adopts cement-based high-strength non-shrinkage grouting material, the stone body does not shrink, the strength is high, and the connection effect is reliable, which can meet the structural safety of the fan foundation under extreme working conditions.

5. The grouting process adopts bottom grouting, and the grouting stones are relatively dense, and the bonding effect with the steel pipe wall is good, and there are no large pores.

6. The optimal design range of the annular space is 40-50 mm, the height of the shear key is 6-8 mm, and the width of the shear key is 10-15 mm.

7. Setting the shear key in the annular space can greatly improve the load transfer capacity of the grouting connection section, and the grouting connection effect of the double-sided setting is better than that of the single-sided setting of the shear key.

8. A guide body is provided in the annular space to facilitate the smooth insertion of the steel pipe pile into the jacket leg column during piling construction.

Description of drawings

Figure 1: It is a schematic diagram of the grouting connection structure between the offshore wind turbine pile foundation and the jacket leg column;

Fig. 2: It is an enlarged schematic diagram of part A in Fig. 1 .

Among them: 1-jacket leg column, 2-pile foundation steel pipe pile, 3-jacket, 4-operating platform, 5-wind tower, 6-annular space; 7-shear key; 8-guide body; 9 -upper occluder, 10-lower occluder, 11-grouting valve; 12-slurry return valve.

Detailed ways

As shown in the accompanying drawings 1 and 2, a grouting connection structure between the pile foundation of an offshore wind turbine and the jacket leg column, the inner wall of the jacket leg column (1) and the outer wall of the pile foundation steel pipe pile (2) form an annular space (6), A shear key (7), a guide body (8) and upper and lower occluders (9, 10) are arranged inside the annular space (6), and the shear key (7) is between the inner wall of the jacket leg column and the outer wall of the steel pipe pile Arranged in a circular direction, the guide body (8) is located on the inner wall of the jacket leg column, the upper and lower occluders (9, 10) are respectively located on the top and bottom of the jacket, and the annular space is filled with cement-based high-strength non-shrink grouting material; shear The key (7) is evenly welded on both sides along the outer wall of the steel pipe pile and the jacket leg column, and the shear key (7) can be welded beads, fillet welded flat steel or fillet welded round steel; the outer wall of the steel pipe pile (2) The shear keys on the inner wall of the jacket leg column (1) are staggered; the bottom of the annular space (6) is provided with a grouting valve (11), and the upper part is provided with a grout return valve; the width of the annular space (6) is 40-50 mm, The height of the shear key (7) is 6-8 mm, and the width of the shear key (7) is 10-15 mm.

The reasonable design of the grouting connection type is: adopt the jacket structure as the foundation structure type of the offshore wind turbine, and realize the connection between the jacket leg column and the steel pipe pile through the grouting connection type. Effective connection; ②No external force and heat are applied to the steel structure; ③Suitable for connections with different surface shapes and different calibers; ④Because there is a certain gap between the steel pipe pile and the leg column, it is easy to absorb component manufacturing errors and installation deviations.

The cement-based high-strength non-shrinkage grouting material is adopted, the stone body has high strength, and the grouting connection effect is reliable, which can meet the structural safety of the fan foundation under extreme working conditions; the bottom grouting process of the annular space is used for grouting, the construction operation is simple, the grouting stone body is dense, and is compatible with The bonding effect of the steel pipe wall is good, and there are no large pores; setting shear keys in the annular space can greatly improve the load transfer capacity of the grouting joint.

The connection structure adopts grouting connection, has no special requirements for equipment, and is easy to operate. It has been successfully applied in the connection section of Jiangsu Xiangshui Offshore Anemometer Tower and can be further popularized and used.

Claims (6)

1. A kind of grouting connection structure of offshore fan pile foundation and jacket leg column, it is characterized in that, jacket leg column (1) inner wall and pile foundation steel pipe pile (2) outer wall form annular space (6), annular space ( 6) The shear key (7), the guide body (8) and the upper and lower occluders (9, 10) are arranged inside, and the shear key (7) is arranged circumferentially between the inner wall of the jacket leg column and the outer wall of the steel pipe pile , the guide body (8) is located on the inner wall of the jacket leg column, the upper and lower occluders (9, 10) are respectively located on the top and bottom of the jacket, and the annular space is filled with cement-based high-strength non-shrinkage grouting material. 2. The grouting connection structure between offshore fan pile foundation and jacket leg column according to claim 1, characterized in that the shear key (7) is uniformly welded along the outer wall of the steel pipe pile, and the shear key (7) can be Welding beads, fillet welded flat bars or fillet welded round bars. 3. The grouting connection structure between the offshore fan pile foundation and the jacket leg column according to claim 1, wherein the shear key (7) is uniformly welded on both sides of the outer wall of the steel pipe pile and the inner wall of the jacket leg column, The shear key (7) can be a welding bead, a fillet welded flat steel or a fillet welded round steel. 4. the grouting connection structure of offshore fan pile foundation and jacket leg column according to claim 3, is characterized in that, the shear key of pile foundation steel pipe pile (2) outer wall and jacket leg column (1) inner wall is Staggered arrangement. 5. The grouting connection structure between the offshore wind turbine pile foundation and the jacket leg column according to claim 1, 2, 3 or 4, characterized in that a grouting valve (11) is provided at the bottom of the annular space (6), The upper part is provided with a slurry return valve (12). 6. The grouting connection structure between offshore wind turbine pile foundation and jacket leg column according to claim 5, characterized in that, the width of the annular space (6) is 40-50 mm, and the height of the shear key (7) is 6-8 mm , The width of the shear key (7) is 10-15 mm.

Images