Provisions on overlapping position of beam reinforcement

The lap position of beam reinforcement is specified as follows:

When the upper reinforcement is overlapped, when its length is less than 22 mm, the joint needs to be bound, and when the stressed reinforcement of the beam is directly above 22 mm (including 22 mm), the joint must be welded. In addition, the distance between the tail of the overlapping length of steel bar and its bent part must be greater than 10 times the diameter of steel bar.

The distance from the end of the lap length to the bend of the steel bar should not be less than 10 times the diameter of the steel bar, and the joint should not be located at the maximum bending moment of the member; In the tension zone, the end of the I-grade steel bar binding extension should be hooked, and the steel bar at that level should not be hooked; The end of the compression grade I steel bar with a diameter equal to or less than 12mm and the end of the stressed steel bar with any diameter in the axial compression member may not be hooked, but the lap length shall not be less than 35 times the diameter of the steel bar. When steel bars overlap, they should be fastened with iron wires at the center and both ends. The position of steel binding joints should be staggered. The percentage of cross-sectional area of steel bars with binding joints from the center of any binding joint to 1.3 times the overlapping length Z is as follows: the tensile area shall not exceed 25%; The compression zone shall not exceed 50%.

In the reinforcement construction, in order to prevent confusion, it is necessary to clearly mark the reinforcement of different specifications and models, which can be wrapped with corresponding signs, and clearly indicate the information such as quantity, specifications and scope of use. In addition, before the steel binding, the construction personnel must have a detailed understanding of the construction drawings, and at the same time check whether the ingredient list is consistent with the steel sign before operation. But if there is any mistake or omission, it must be supplemented in time.

Legal basis:

Law of People's Republic of China (PRC) on Work Safety

Article 23 A production and business operation entity shall have the capital investment necessary for safe production conditions, which shall be guaranteed by the decision-making organ, principal responsible person or individual investor of the production and business operation entity, and shall be responsible for the consequences caused by insufficient capital investment necessary for safe production. The relevant production and business units shall, in accordance with the provisions, extract and use the expenses for safe production, which shall be used exclusively to improve the conditions for safe production. The cost of production safety shall be truthfully charged in the cost. Specific measures for the extraction, use, supervision and management of production safety expenses shall be formulated by the finance department of the State Council in conjunction with the emergency management department of the State Council in consultation with relevant departments of the State Council.

Twenty-fourth mining, metal smelting, construction, transportation units and dangerous goods production, management, storage, loading and unloading units shall set up safety production management institutions or be equipped with full-time safety production management personnel. Where there are more than 100 employees in other production and business units other than those specified in the preceding paragraph, a safety production management institution shall be set up or full-time safety production management personnel shall be equipped; Employees in less than one hundred people, should be equipped with full-time or part-time safety management personnel.