Offshore wind power steel pipe constraint UHPC sleeve-steel pipe grouting connection joint

Abstract

The invention discloses an offshore wind power steel pipe constraint UHPC sleeve-steel pipe grouting connection joint, and belongs to the technical field of wind power generation equipment. The connecting joint sequentially comprises a steel pipe, a grouting material and a UHPC (Ultra High Performance Concrete) sleeve from inside to outside, wherein the grouting material is filled in an annular gap formed by the UHPC sleeve and the steel pipe. A plurality of annular convex steel shear keys are uniformly arranged on the outer surface of the steel pipe; a restraining steel pipe and a plurality of reinforcing steel bars are arranged in the UHPC casing pipe, and a plurality of annular concave trapezoidal shear keys are evenly arranged on the inner surface of the UHPC casing pipe. The steel pipe constraint UHPC sleeve-steel pipe grouting connection joint has the beneficial effects that the steel pipe constraint UHPC sleeve-steel pipe grouting connection joint is good in integrity, large in rigidity and high in bearing capacity, meanwhile has excellent fatigue resistance, impact resistance and corrosion resistance, and has remarkable advantages in the aspect of carbon emission. The connecting device can be used for connecting a UHPC tower drum and a single-pile foundation in offshore wind power, and can also be used for connecting a jacket and a UHPC foundation. The problem of serious corrosion of steel can be reduced, the later operation and maintenance cost of the structure is reduced, and high economic benefits and social benefits are achieved.

Description

Technical Field

[0001] The invention relates to wind power generation equipment, and in particular to an offshore wind power steel pipe-constrained UHPC casing-steel pipe grouting connection node. Background Art

[0002] Offshore wind farms have great development prospects due to their advantages of high wind speed, stable wind force and vast space. my country has abundant offshore wind energy resources, and the exploitable offshore wind energy reserves are about 750 million kW. Offshore wind power generally uses fixed foundations, and grouting connection nodes are widely used in the connection of fixed foundations such as single piles or jackets due to their good mechanical properties and economic performance.

[0003] The grouting connection section transfers the deadweight and wind and wave loads of the upper wind turbine structure to the foundation, and is a crucial connection component in the entire supporting structure. The fatigue problem of the currently commonly used steel pipe structure is prominent, and the harsh marine environment will accelerate the corrosion of steel, which will significantly increase the subsequent operation and maintenance costs. In the single pile foundation or the first pile method jacket foundation, if the UHPC tower or UHPC foundation is used, it can effectively overcome the shortcomings of traditional steel towers and steel piles in manufacturing, durability, and economy. Therefore, the development of a simple and reliable UHPC casing-steel pipe grouting connection node is of great significance for practical engineering. Summary of the invention

[0004] The purpose of the embodiment of the present application is to provide an offshore wind power steel pipe constrained UHPC casing-steel pipe grouting connection node, which can be used for the connection between the UHPC tower and the monopile foundation in offshore wind power, and can also be used for the connection between the conductor frame and the UHPC foundation in the pile-first method.

[0005] The technical solution adopted by the present invention to solve its technical problem is: an offshore wind power steel pipe constrained UHPC casing-steel pipe grouting connection node, which comprises a steel pipe, a grouting material and a UHPC casing from the inside to the outside.

[0006] Furthermore, the grouting material is filled in the annular gap formed by the UHPC casing and the steel pipe.

[0007] Furthermore, a plurality of annular raised steel shear keys are evenly arranged on the outer surface of the steel pipe, and the steel shear keys are welded to the outer surface of the steel pipe. Furthermore, a restraining steel pipe and a plurality of steel bars are arranged inside the UHPC casing, and a plurality of annular recessed trapezoidal shear keys are evenly arranged on the inner surface of the UHPC casing.

[0008] Furthermore, the height of the restraining steel pipe is consistent with the height of the grouting node.

[0009] Furthermore, the height of the trapezoidal shear key should not be less than 35 mm, and the ratio of its height to its average width should be 1:2.

[0010] Furthermore, the number of the trapezoidal shear keys is greater than that of the steel shear keys, and the two are arranged in a staggered manner.

[0011] The beneficial effects of this application are:

[0012] (1) By setting an annular concave trapezoidal shear key on the inner surface of the UHPC casing, it is not only convenient for construction, but also can effectively improve the shear resistance of the interface, thereby effectively transferring the deadweight and wind and wave loads of the upper wind turbine structure to the foundation.

[0013] (2) By placing the restraining steel pipe inside the UHPC casing, not only can the corrosion of the steel be effectively prevented, but the lateral deformation of the grouting connection node can also be effectively restrained, thereby improving the integrity, stiffness, strength and ductility of the grouting connection node.

[0014] (3) The steel pipe-constrained UHPC casing-steel pipe grouting connection node has good integrity, high rigidity, high bearing capacity, excellent fatigue resistance, impact resistance and corrosion resistance, and has the advantages of both steel structure and concrete structure, and has significant advantages in carbon emissions. At the same time, it can reduce the serious corrosion problem of steel materials and reduce the cost of later operation and maintenance of the structure, with high economic and social benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the steel pipe restrained UHPC casing-steel pipe grouting connection node structure of the present invention;

[0016] Figure 2 It is a schematic diagram of the steel pipe structure of the present invention;

[0017] Figure 3 It is a schematic diagram of the UHPC casing structure of the present invention. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0019] In the following, in conjunction with the accompanying drawings, an offshore wind power steel pipe constrained UHPC casing-steel pipe grouting connection node provided in an embodiment of the present application is described in detail through specific embodiments and application scenarios.

[0020] See also Figure 1-3 As shown, an embodiment of the present application provides an offshore wind power steel pipe constrained UHPC casing-steel pipe grouting connection node, which includes a steel pipe 1, a grouting material 2 and a UHPC casing 3 from the inside to the outside.

[0021] The steel pipe 1 is provided with an annular raised steel shear key 101, which is welded to the outer surface of the steel pipe 1 and can be combined with Figure 2 shown.

[0022] The UHPC casing 3 is provided with a restraining steel pipe 301 and a plurality of steel bars 302 inside, and a plurality of annular recessed trapezoidal shear keys 303 are evenly arranged on the inner surface thereof, which can be combined with Figure 3 shown.

[0023] The grouting material 2 is filled in the annular gap formed by the steel pipe 1 and the UHPC casing 3. Figure 1 shown.

[0024] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. An offshore wind power steel pipe-constrained UHPC casing-steel pipe grouting connection node, characterized in that: From the inside to the outside, there are steel pipe, grouting material and UHPC casing pipe in order; the grouting material is filled in the annular gap formed by the UHPC casing pipe and the steel pipe.

2. The offshore wind power steel pipe-constrained UHPC casing-steel pipe grouting connection node according to claim 1 is characterized in that: A plurality of annular raised steel shear keys are evenly arranged on the outer surface of the steel pipe, and the steel shear keys are welded to the outer surface of the steel pipe.

3. The offshore wind power steel pipe-constrained UHPC casing-steel pipe grouting connection node according to claim 1 is characterized in that: A restraining steel pipe and a plurality of steel bars are arranged inside the UHPC casing, and a plurality of annularly recessed trapezoidal shear keys are evenly arranged on the inner surface of the UHPC casing.

4. The offshore wind power steel pipe-constrained UHPC casing-steel pipe grouting connection node according to claim 1 is characterized in that: The height of the restraining steel pipe is consistent with the height of the grouting node.

5. The offshore wind power steel pipe-constrained UHPC casing-steel pipe grouting connection node according to claim 1 is characterized in that: The height of the trapezoidal shear key should not be less than 35 mm, and the ratio of its height to its average width should be 1:

2.

6. The offshore wind power steel pipe-constrained UHPC casing-steel pipe grouting connection node according to claim 1, characterized in that: The number of the trapezoidal shear keys is greater than that of the steel shear keys, and the two are arranged alternately.

Images