Offshore wind power UHPC (Ultra High Performance Concrete) casing pipe-steel pipe grouting connection joint based on combined force transmission

Abstract

The invention discloses an offshore wind power UHPC sleeve-steel pipe grouting connection joint based on combined force transmission, 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. Steel shear keys are arranged on the outer walls of the steel pipes; a conversion steel pipe, a PBL shear key, a plurality of ring ribs and longitudinal ribs are arranged in the UHPC sleeve; the steel shear keys are arranged on the inner wall of the conversion steel pipe, the PBL shear keys are perpendicularly welded to the outer wall of the conversion steel pipe, the annular ribs penetrate through round holes in the PBL shear keys, and the longitudinal ribs and the annular ribs are bound into a whole. The offshore wind power UHPC sleeve-steel pipe grouting connection joint based on combined force transmission has the beneficial effects that the integrality is good, the rigidity is large, the bearing capacity is high, meanwhile, the excellent fatigue resistance, impact resistance and corrosion resistance are achieved, and the remarkable advantage in the aspect of carbon emission is achieved. 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 the steel tower drum and the steel pile commonly used at present can be reduced, the later operation and maintenance cost of the structure is reduced, construction and installation are convenient, 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 UHPC casing-steel pipe grouting connection node based on combined force transmission. 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 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 pile-first method jacket foundation, if UHPC tower or UHPC foundation is used, it can effectively overcome the shortcomings of traditional steel towers and steel piles in manufacturing, durability, economy, etc. 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 UHPC casing-steel pipe grouting connection node based on combined force transmission, 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.

[0005] The technical solution adopted by the present invention to solve its technical problem is: an offshore wind power UHPC casing-steel pipe grouting connection node based on combined force transmission, 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.

[0008] Furthermore, a conversion steel pipe, a plurality of PBL shear keys, a plurality of annular reinforcements and longitudinal reinforcements are arranged in the UHPC casing.

[0009] Furthermore, a plurality of annular raised steel shear keys are evenly arranged on the inner surface of the conversion steel pipe, and the steel shear keys are welded to the inner surface of the conversion steel pipe.

[0010] Furthermore, the PBL shear key is in the form of a long strip plate structure, and is penetrated by a plurality of circular holes arranged at intervals along its length direction; the plurality of circular holes are arranged at equal intervals, the diameter of the circular holes is d=0.2-0.5b, and the spacing of the circular holes is s≥2.25d, wherein d is the diameter of the circular holes, s is the spacing of the circular holes, and b is the width of the shear key.

[0011] Furthermore, the PBL shear key is vertically welded to the outer surface of the conversion steel pipe, and the outer surface of the conversion steel pipe is attached to the inner surface of the UHPC casing.

[0012] Furthermore, the annular reinforcement passes through the circular hole on the PBL shear key, and the longitudinal reinforcement is bound with the annular reinforcement as a whole.

[0013] Furthermore, the steel shear keys on the outer surface of the steel pipe and the steel shear keys on the inner surface of the conversion steel pipe are arranged alternately.

[0014] Furthermore, the height of the PBL shear key and the conversion steel pipe is consistent with the height of the grouting node.

[0015] The beneficial effects of this application are:

[0016] (1) The installation of conversion steel pipes can effectively constrain the lateral deformation of the grouting nodes, thereby improving the stiffness, strength and ductility of the grouting nodes.

[0017] (2) By setting PBL shear keys to connect the UHPC casing and the conversion steel pipe as a whole, not only the integrity of the node is improved, but also the combined effect between steel and UHPC is increased, which can effectively reduce the thickness of the steel pipe; setting PBL shear keys can also effectively transmit the interface shear force, thereby transferring the self-weight and wind and wave loads of the upper wind turbine structure to the foundation.

[0018] (3) The offshore wind power UHPC casing-steel pipe grouting connection node based on combined force transmission 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 and reduce the cost of later operation and maintenance of the structure, so it has high economic and social benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the structure of the offshore wind power UHPC casing-steel pipe grouting connection node based on combined force transmission of the present invention;

[0020] Figure 2 It is a schematic diagram of the steel pipe structure of the present invention;

[0021] Figure 3 It is a schematic diagram of the conversion steel pipe and PBL shear key structure of the present invention. DETAILED DESCRIPTION

[0022] 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.

[0023] 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.

[0024] See also Figure 1-3 As shown, an embodiment of the present application provides an offshore wind power UHPC casing-steel pipe grouting connection node based on combined force transmission, which includes a steel pipe 1, a grouting material 2 and a UHPC casing 3 from the inside to the outside.

[0025] 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.

[0026] The UHPC casing 3 is provided with a conversion steel pipe 301, a PBL shear key 302, annular reinforcement 303 and longitudinal reinforcement 304, which can be combined with Figure 1 shown.

[0027] The inner surface of the conversion steel pipe 301 is evenly provided with a plurality of annular raised steel shear keys 305, and the steel shear keys 305 are welded to the inner surface of the conversion steel pipe 301; the PBL shear keys 302 are vertically welded to the outer surface of the conversion steel pipe 301, and the outer surface of the conversion steel pipe 301 is attached to the inner surface of the UHPC casing 3, which can be combined with Figure 1 shown.

[0028] The annular reinforcement 303 passes through the circular hole 306 of the PBL shear key 303, and the longitudinal reinforcement 304 is tied with the annular reinforcement 303 as a whole. Figure 3 shown.

[0029] The steel shear keys 101 on the outer surface of the steel pipe and the steel shear keys 305 on the inner surface of the conversion steel pipe are arranged alternately. Figure 1 shown.

[0030] The grouting material 2 is filled in the annular gap formed by the steel pipe 1 and the UHPC casing 3. Figure 1 shown.

[0031] 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 UHPC casing-steel pipe grouting connection node based on combined force transmission, characterized in that: From the inside to the outside, there are steel pipe, grouting material and UHPC casing; the grouting material is filled in the annular gap formed by the UHPC casing and the steel pipe.

2. According to claim 1, an offshore wind power UHPC casing-steel pipe grouting connection node based on combined force transmission 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. According to the offshore wind power UHPC casing-steel pipe grouting connection node based on combined force transmission according to claim 1, it is characterized in that: A conversion steel pipe, a plurality of PBL shear keys, a plurality of annular reinforcements and longitudinal reinforcements are arranged in the UHPC casing.

4. The offshore wind power UHPC casing-steel pipe grouting connection node based on combined force transmission according to claim 1 is characterized in that: A plurality of annular raised steel shear keys are evenly arranged on the inner surface of the conversion steel pipe, and the steel shear keys are welded to the inner surface of the conversion steel pipe.

5. The offshore wind power UHPC casing-steel pipe grouting connection node based on combined force transmission according to claim 1 is characterized in that: The PBL shear key is a long strip plate structure, and is penetrated by a plurality of circular holes arranged at intervals along its length direction; the plurality of circular holes are arranged at equal intervals, the diameter of the circular holes is d=0.2-0.5b, and the interval between the circular holes is s≥ 2.25d, where d is the diameter of the circular hole, s is the spacing between the circular holes, and b is the width of the shear key.

6. The offshore wind power UHPC casing-steel pipe grouting connection node based on combined force transmission according to claim 1 is characterized in that: The PBL shear key is vertically welded to the outer surface of the conversion steel pipe, and the outer surface of the conversion steel pipe is attached to the inner surface of the UHPC casing.

7. The offshore wind power UHPC casing-steel pipe grouting connection node based on combined force transmission according to claim 1 is characterized in that: The annular reinforcement passes through the circular hole on the PBL shear key, and the longitudinal reinforcement is bound with the annular reinforcement as a whole.

8. The offshore wind power UHPC casing-steel pipe grouting connection node based on combined force transmission according to claim 1 is characterized in that: The steel shear keys on the outer surface of the steel pipe and the steel shear keys on the inner surface of the conversion steel pipe are arranged alternately.

9. The offshore wind power UHPC casing-steel pipe grouting connection node based on combined force transmission according to claim 1, characterized in that: The height of the PBL shear key and the conversion steel pipe is consistent with the height of the grouting node.

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