Several problems that should be paid attention to in metal tensile testing machine
Scaffolding is to improve the safety factor in the design of civil engineering and mechanical engineering, and prevent the consequences caused by the shortcomings of the materials, the deviation of the work, the sudden increase of external forces and other factors. The force that the force-bearing part of the project can theoretically bear must be The ratio of the limit stress to the allowable stress, which is greater than the force it actually bears, is called the safety factor.
1.05~1.55m, the step distance of masonry scaffolding is generally 1.20~1.35m, the scaffolding for decoration, masonry and decoration is generally 1.80m, and the vertical distance of poles is 1.2~2.0m. Scaffolding is used on construction sites where external walls, internal decoration or high storeys cannot be directly constructed. According to the setting of the connecting wall poles and the size of the load, the commonly used open double-row scaffolding pole span is generally the formwork bracket used in the construction of the project, mainly for the construction of the floor bracket.
Scaffolding is a frame set up at the construction site for safety protection, worker operation and solving level transportation on the floor. Among them, the fastener-type steel pipe scaffold has the advantages of convenient assembly and disassembly, flexible erection, strong versatility, and relatively economical advantages. It is widely used. The cantilever length of the cantilever steel beam should be determined according to the design, and the length of the fixed section should not be less than 1.25 times the length of the cantilever section.
Quick-acting, easy to disassemble and assemble, it is very simple to use, can speed up the construction period, has high bearing capacity, good performances such as bending and compression resistance. Portal scaffolding has its own standards for installation, which should be neat and uniform, and have a stable support system in two mutually perpendicular directions. Before erecting, it must be strictly laid out in accordance with the design requirements on the spot. During the installation of the mast support, it is required to add a 48 x 3.5 steel pipe horizontal pull rod to buckle each level of mast installed.