Reinforcement mechanical anchorage technology

 

In order to comprehensively improve the technical level of the construction industry, the Ministry of housing and urban rural development issued a notice on the promotion and application of 10 new technologies in the construction industry (2017 Edition). The following are the specific contents of the 10 new technologies in the construction industry (2017 Edition). As a first-class constructor and on the way to a first-class constructor, you must know:

 

Technical content

The mechanical anchoring technology of reinforcement is an anchoring device formed by connecting the anchor plate with the end of reinforcement through threads. Its action mechanism is: the anchoring force of the reinforcement is borne by the anchor plate or by the bonding force between the anchor plate and the reinforcement (see Fig. 2.1 for the principle), so as to reduce the anchorage length of the reinforcement and save the amount of reinforcement. The mechanical anchoring technology of reinforcement in complex joints can also simplify the construction of reinforcement engineering, reduce the dense congestion of reinforcement and the difficulty of binding, improve the mechanical performance of joints and improve the quality of concrete pouring. The main contents of this technology include: design and application technology of partial anchor plate reinforcement, design and application technology of full anchor plate reinforcement, on-site processing and installation technology of anchor plate reinforcement, etc. See technical specification for application of reinforced anchor plate jgj256 for detailed technical contents.

?Technical indicators

For some anchor plate reinforcement, the bonding section of the reinforcement and the anchor plate shall jointly bear the anchoring force of the reinforcement. At this time, the bearing area of the anchor plate shall not be less than 4.5 times the nominal area of the reinforcement, and the length of the bonding section of the reinforcement shall not be less than 0.4lab; The anchor plate shall bear the anchoring force of all reinforcement. At this time, the bearing area of the anchor plate shall not be less than 9 times of the nominal area of the reinforcement. The connection strength between the anchor plate and the reinforcement shall not be less than the standard value of the ultimate strength of the connected reinforcement, and the actual anchorage strength of the anchor plate reinforcement in the concrete shall not be less than the standard value of the ultimate strength of the reinforcement. For detailed technical indicators, see the industrial standard technical specification for application of reinforcement anchor plate jgj256.

 

 

Compared with the traditional reinforcement anchorage technology, the application of reinforcement mechanical anchorage technology in concrete structure can reduce the anchorage length of reinforcement by more than 40% and save the anchorage reinforcement by more than 40%.

 

Scope of application

 

The technology is applicable to the mechanical anchorage of reinforcement in concrete structure. The main scope of application is: using anchor plate reinforcement instead of traditional bending reinforcement for beam column joints of frame structure; Instead of the traditional bending bar and straight bar anchorage, it is used for the shear reinforcement of simply supported beam support, beam or slab; It can be widely used in construction engineering, bridge, hydraulic structure, subway, tunnel, nuclear power station and other concrete structure engineering. It can also be used as fastener of reinforcement anchor rod (or tie rod).

 

Engineering case

The mechanical anchoring technology of steel bars has been widely used in nuclear power engineering, water conservancy and hydropower, housing construction and other engineering fields. Typical nuclear power projects, such as Fujian Ningde, Zhejiang Sanmen, Shandong Haiyang, Qinshan Phase II expansion, Fangjiashan and other nuclear power plants; Typical water conservancy and hydropower projects, such as Xiluodu Hydropower Station; Typical housing construction, such as Taiyuan Museum, Shenzhen Vanke fifth Park project, etc.