CN116039861A - A floating foundation supported by steel-concrete composite multi-columns - Google Patents

Abstract

The invention discloses a steel-concrete combined multi-column supported floating foundation which consists of columns, horizontally connected steel pipes, transition sections, anchor chains and anchors, wherein 3-4 columns are uniformly distributed around the transition sections, and the columns are connected with each other through two horizontally connected steel pipes which are parallel to each other; the transition section is a round conical steel pipe with a large upper diameter and a small lower diameter; the upper part of the transition section can be connected with a fan tower through a flange; the upright post, the transition section and the horizontal connecting steel pipe are connected into a whole in a welding mode; one end of the anchor chain is connected with the top of each upright post, and the other end is connected with an anchor on the seabed, so that the whole floating foundation platform is limited to a designated area.

Description

A floating foundation supported by steel-concrete composite multi-columns

technical field

The invention relates to the technical field of offshore wind power infrastructure, in particular to a steel-concrete composite floating foundation supported by multiple columns.

Background technique

In the past few decades, people have fully realized the necessity of developing new energy sources. Wind energy has received the same attention as other clean and renewable energy sources. With the support of governments in various countries, wind power has grown rapidly, and its development technology has become more mature and commercialized. It has become one of the most suitable new energy sources for large-scale development.

As the water depth increases, the design difficulty and investment cost of offshore fixed wind turbine support foundations increase sharply, and the advantages of floating wind turbines are gradually highlighted. Offshore floating wind turbines can be regarded as a combination of a floating platform and a wind turbine. The platform is used as a support to control the position and attitude of the wind turbine, thereby ensuring energy capture.

Traditional floating structures are mainly composed of steel structures, and the cost of materials is relatively high. With the implementation of grid parity for wind power in my country, higher requirements are put forward for the cost of wind power projects.

Contents of the invention

The object of the present invention is to overcome the deficiencies in the prior art and provide a floating foundation supported by steel-concrete composite multi-columns, so as to reduce the amount of steel used in the foundation structure and reduce the overall cost.

The purpose of the present invention is achieved through the following technical solutions:

A floating foundation supported by steel-concrete composite multi-columns, which is composed of upright columns, horizontal connecting steel pipes, transition sections, anchor chains and anchors. There are 3 to 4 upright columns which are evenly distributed around the transition section. The transition section and the adjacent columns are connected to each other by two horizontal connecting steel pipes parallel to each other;

The transition section is an inverted conical steel pipe with a large diameter on the upper part and a small diameter on the lower part; the upper part of the transition section can be connected to the fan tower through a flange;

The column, the transition section, and the horizontal connecting steel pipe are connected as a whole by welding;

One end of the anchor chain is connected to the top of each column, and the other is connected to the anchor on the seabed to limit the entire floating foundation platform to a designated area;

The column is a dumbbell-shaped structure with a small diameter in the middle and a large diameter at both ends, including an inner steel plate, an outer steel plate and a subdivision steel plate. The space between the inner steel plate and the outer steel plate is filled with concrete. Several compartment steel plates are arranged from top to bottom; top steel plates and bottom steel plates are fixedly connected to the top and bottom of the column respectively to realize the sealing of the inner steel plate, the outer steel plate and the inside of the column.

Further, the outer diameter of the middle part of the column is 8-12m, the outer diameter of both ends is 13-17m, and the thickness of the inner steel plate and the outer steel plate is 8-12mm.

Further, the wall thickness of the concrete is 320-380 mm; the thickness of the subdivision steel plate, top steel plate and bottom steel plate is 18-22 mm.

Further, the distance between the centers of adjacent columns is 38-42m.

Compared with the prior art, the beneficial effects brought by the technical solution of the present invention are:

Compared with the traditional column structure, the present invention has the middle part of the dumbbell-shaped column near the waterline, which can reduce the force of waves; The upper part of the dumbbell-shaped column gradually expands, and when the foundation is tilted like water, the restoring force can be gradually increased, which is conducive to the stability of the foundation; the overall structure adopts a steel-concrete composite structure, which can reduce the amount of steel used in the overall structure.

In addition, the floating foundation design provided by the present invention will provide increased bearing capacity of the column top; reduce the change restriction coefficient of the water level: increase the support structure, increase the support force of the column top; reduce safety risks: use concrete support between multiple columns of steel-concrete combination, The load-bearing structure can be fully utilized.

Description of drawings

Fig. 1 is a schematic diagram of the overall structure of the floating foundation of the present invention.

Fig. 2 is a schematic cross-sectional structure diagram of a dumbbell-shaped column.

Reference signs: 1-column, 101-concrete, 102-inner steel plate, 103-outer steel plate, 104-subdivision steel plate, 105-top steel plate, 106-bottom steel plate, 2-horizontal connecting steel pipe, 3-anchor chain, 4 -anchor, 5-transition

Detailed ways

The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

As shown in Figures 1 and 2, this embodiment provides a steel-concrete composite floating foundation supported by multiple columns, including columns 1, horizontal connecting steel pipes 2, anchor chains 3, anchors 4, and transition sections 5.

In this embodiment, the column 1 is a steel-concrete composite cavity structure, the outer diameter of the middle is 10m, and the outer diameter of both ends is 15m. The steel plate 102 and the outer steel plate 103 have a thickness of 10mm, the local joints are thickened to 25mm, and the wall thickness of the middle concrete 101 is 350mm; the interior is provided with a subdivision steel plate 104, the top is a top steel plate 105, and the bottom is a bottom steel plate 106. In this embodiment, all The thickness of the steel plate is 20mm; there are 4 dumbbell-shaped columns 1, which are evenly arranged on the outside of the entire structure, and the center distance between adjacent columns 1 is 40m.

The transition section 5 is an inverted conical steel pipe with an upper outer diameter of 10m and a lower outer diameter of 3m; the upper part can be connected to the fan tower through a flange.

The column 1, the transition section 5, and the horizontal connecting steel pipe 2 are connected as a whole by welding. The column 1 can be regarded as a large-diameter cylindrical tube, an inverted trapezoidal tube, a small-diameter cylindrical tube, a trapezoidal cylindrical tube, and a large-diameter cylindrical tube that are sequentially arranged from top to bottom. The cavity formed between the inner steel plate 102 and the outer steel plate 103 of the column 1 is integral, so the concrete 101 as a whole also forms the same dumbbell shape as the column 1 .

One end of the anchor chain 3 is connected to the top of each column 1, and the other section is connected to the anchor 4 on the seabed, so that the entire foundation platform is limited to a designated area.

Compared with the traditional column structure, the present invention has the middle part of the dumbbell-shaped column 1 near the waterline, which can reduce the force of waves; The structure is heaving; the upper part of the dumbbell-shaped column 1 gradually expands, and when the foundation is tilted like water, the restoring force can be gradually increased, which is beneficial to the stability of the foundation; the overall structure adopts a steel-concrete composite structure, which can reduce the amount of steel used in the overall structure.

In the present embodiment, several through holes can be arranged on the steel plate for subdivision or not.

This embodiment can enable those skilled in the art to understand the present invention more comprehensively, but does not therefore limit the present invention to the scope of the described implementation. Except for the above-mentioned embodiments, the present invention can also have other implementations. The technical solutions formed by equivalent replacement or equivalent transformation all fall within the protection scope of the present invention.

The present invention is not limited to the embodiments described above. The above description of specific embodiments is intended to describe and illustrate the technical solution of the present invention, and the above specific embodiments are only illustrative and not restrictive. Without departing from the gist of the present invention and the scope of protection of the claims, those skilled in the art can also make many specific changes under the inspiration of the present invention, and these all belong to the protection scope of the present invention.

Claims (4)

1. The steel-concrete combined multi-column supported floating foundation is characterized by comprising columns, horizontal connecting steel pipes, transition sections, anchor chains and anchors, wherein 3-4 columns are uniformly distributed around the transition sections, and the columns are connected with each other through two parallel horizontal connecting steel pipes;

the transition section is a round conical steel pipe with a large upper diameter and a small lower diameter; the upper part of the transition section can be connected with a fan tower through a flange;

the upright post, the transition section and the horizontal connecting steel pipe are connected into a whole in a welding mode;

one end of the anchor chain is connected with the top of each upright post, and the other end of the anchor chain is connected with an anchor on the seabed, so that the whole floating foundation platform is limited in a designated area;

the upright post is of a dumbbell-shaped structure with a small middle diameter and large diameters at two ends, and comprises an inner steel plate, an outer steel plate and a cabin-dividing steel plate, concrete is filled between the inner steel plate and the outer steel plate, and a plurality of cabin-dividing steel plates are arranged on the inner steel plate wall inside the upright post from top to bottom; the top and the bottom of the upright post are fixedly connected with a top steel plate and a bottom steel plate respectively to realize the sealing of the inner steel plate, the outer steel plate and the inside of the upright post.

2. The floating foundation supported by the steel-concrete combined multi-column according to claim 1, wherein the outer diameter of the middle part of the column is 8-12 m, the outer diameters of the two ends are 13-17 m, and the thicknesses of the inner steel plate and the outer steel plate are 8-12 mm.

3. The steel-concrete combined multi-column supported floating foundation according to claim 1, wherein the wall thickness of the concrete is 320-380 mm; the thicknesses of the cabin-dividing steel plate, the top steel plate and the bottom steel plate are 18-22 mm.

4. A steel reinforced concrete composite multi-column supported floating foundation according to claim 1 wherein the distance between the centers of adjacent columns is 38-42 m.

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