Preface

In recent years, new concrete technologies and materials have been widely used in engineering renovation and reinforcement. Chemical rebaring reinforcement technology is a new type of reinforcement and reconstruction technology for reinforced concrete structures. It not only has the characteristics of convenient construction, small working face and high working efficiency, but also has the advantages of strong adaptability, wide application range, good integrity of anchorage structure and low cost. Therefore, it is widely used in building reinforcement and concrete reinforcement projects.

Technical Characteristics of Reinforcement Rebar Planting

Because it is no longer necessary to dig a lot of holes in the anchorage of reinforced concrete structures, but only after drilling holes in the anchorage area, using chemical anchorage agent as the bonding agent between steel and concrete can ensure the good bonding between steel and concrete, thus reducing the damage to the original structural components, and also reducing the amount of reinforcement engineering.

Among many reinforcement technologies of building structures, the technology of planting steel bars has its unique technical characteristics.

(1) Flexible design and wide application. According to the use needs, the number and specification of reinforcement can be designed at any position of reinforced concrete structure according to the structural stress characteristics.

(2) The positioning is accurate and reliable. Generally, reinforced concrete structures need to reserve embedded parts when connecting with other structures, but the embedded parts have the weakness of difficult to adjust the position. After structural function adjustment, the position of embedded parts will be difficult to change, and the planting bar has flexibility, and its reliability is the same as that of embedded parts.

(3) Convenient construction.

(4) The process is simple and time-saving.

General situation of engineering and reinforcement scheme

A shopping mall project, formerly a weaving workshop, was completed in the 1990s. Because of the development of the city and the need of the functional change of the original workshop, it is necessary to expand the original building and change the second floor of the original workshop into a large shopping mall.

Although the original workshop has existed for nearly 15 years, it has been thoroughly and meticulously investigated on the spot. There is no crack phenomenon which has great damage to the structure and affects the safety of the structure. It is determined that the main structure of the original workshop is in good condition. According to the function of the original workshop, the stress analysis of the whole structure of the old workshop is carried out. It is concluded that most of the structural components of the original workshop can meet the stress requirements of the new structure as the main exhibition building. Only a few columns and foundations need to be enlarged. The second floor is the biggest difficulty in this reconstruction because of the change of load. Whether it is adding beams and slabs or enlarging the column and foundation section, the connection between new beams and old columns, new and old beams and foundations must be faced. It can be said that whether this problem can be solved is the key to the success or failure of the reconstruction project.

According to the principle of making full use of the original structure, safety, applicability, economy and rationality, after various comparisons, the connection method of opening the protective layer of components to weld the main bars is rejected, because it not only has a large workload, but also is not easy to master the technology and damage the original main bars. It is determined to adopt a more advanced and technically guaranteed planting bar connection, which is simple to operate and convenient to construct. It not only guarantees the quality of the project with many test data, but also speeds up the progress of the project and meets the requirement of tight construction period.