A high-strength prestressed anchor bolt

Abstract

The invention relates to a high-strength prestressed anchor bolt. By improving the bolt thread form data, thread and rod transition region, heat treatment process and bolt material of the prestressed anchor bolt, the problems of deformed steel bars for prestressed concrete in use, such as short fatigue life, high brittleness, poor toughness, power elasticity, poor screwing precision, easy loosening and poor post-stretching mechanical properties, are solved. The success of the development of the high-strength prestressed anchor bolt solves the problem that advanced technologies have to be introduced for domestic wind turbine foundation construction; compared with ordinary deformed steel bar products used in conventional wind turbine foundations, the high-strength prestressed anchor bolt can save reinforcing steel bars by more than 30 percent and concrete by more than 40 percent and reduce earth volume by 50 percent, and the total construction cost is reduced by 25 percent to 35 percent in comparison with the total construction cost of a conventional wind turbine foundation. The construction period is shortened greatly.

Description

technical field [0001] The invention relates to an anchor bolt, in particular to a high-strength prestressed anchor bolt for the foundation foundation of a wind farm unit. Background technique [0002] At present, the domestic wind turbine foundation construction uses advanced foreign technology, and its basic steel is high-strength threaded steel rods; when using the advanced technology of foreign wind turbine foundations in China, threaded steel bars for prestressed concrete are used. This product is a hot-rolled The straight steel bars with discontinuous external threads are suitable for use in the concrete pouring process and form prestressed components together with concrete; threaded steel bars for prestressed concrete are used for fan foundations and have the following disadvantages: 1. Although the strength of the rod body is high, However, the material is brittle, has poor toughness, poor elasticity, and low fatigue life; 2. The rolled discontinuous external thread ...

AI Technical Summary

Problems solved by technology

[0002] At present, the domestic wind turbine foundation construction uses advanced foreign technology, and its basic steel is high-strength threaded steel rods; when using the advanced technology of foreign wind turbine foundations in China, threaded steel bars for prestressed concrete are used. This product is a hot-rolled The straight steel bars with discontinuous external threads are suitable for use in the concrete pouring process and form prestressed components together with concrete; threaded steel bars for prestressed concrete are used for fan foundations and have the following disadvantages: 1. Although the strength of the rod body is high, However, the material is brittle, has poor toughness, poor elasticity, and low fatigue life; 2. The rolled discontinuous external thread has poor dimensional accuracy, poor installation accuracy of thread and nut, easy loosening, poor tensile performance, rough and uneven cross section, In the wind turbine foundation construction, the threaded steel bars for prestressed concrete are installed inside the PVC pipe without contact with the concrete. After installation, tension is applied to each threaded steel bar of the fan foundation. Due to the high brittleness of the threaded steel bars, the threaded steel bars will delayed fracture

[0003] In view of the low fatigue life, high brittleness, poor toughness, poor elasticity, poor thread installation accuracy, easy loosening and tension of threaded steel bars for prestressed concrete during use Due to poor mechanical properties after tension, our company has developed high-strength prestressed anchor bolts for fan foundations.

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