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The commonly used fasteners in China are made of cast iron, and their mechanical properties should comply with the "Steel Pipe Scaffolding Fasteners" (-) and the material should not be lower than -. There are three types of fasteners: right-angle fasteners, butt fasteners, and rotating fasteners. Packed in woven bags, each package is one. The weight of each should be (including bolts and nuts). Generally, anti-rust treatment is done by dipping it in red anti-rust paint. For use with rack tubes. The production and procurement ratio of general fastener products is::. That is to say, the proportions are right angles, docking, and rotation.
Fasteners are intermediate connecting parts that connect rails and sleepers. Its function is to fix the rail on the sleeper, maintain the track gauge and prevent the rail from moving vertically and horizontally relative to the sleeper. On the track of concrete sleepers, since the elasticity of concrete sleepers is poor, the fasteners need to provide sufficient elasticity. To this end, the fasteners must have sufficient strength, durability, and a certain degree of elasticity, and effectively maintain a reliable connection between the rail and the sleeper. In addition, the fastener system is also required to have fewer parts, simple installation and easy disassembly.
The correct use of fasteners is helpful to extend the life of the fasteners. The correct usage method is as follows:
Before the construction of the fastener-type steel pipe formwork bracket, a construction plan must be prepared and a relatively strict and thorough construction plan should be formulated. If the plan If it is not well formulated, some unpredictable events may occur during construction.
, fastener appearance quality requirements. Jingchan inspects the appearance quality of fasteners. Fasteners with cracks, deformations or slippage on bolts are strictly prohibited to prevent construction failures and accidents from using these unqualified fasteners.
The steel pipes and fasteners used in erecting fastener-type formwork brackets must be sampled and tested before use. The quality and appearance of the steel pipes and fasteners are sampled to check whether they meet the standards. The relevant sampling inspection quantities shall be carried out in accordance with relevant regulations, and certain Sampling testing shall be carried out according to the proportion, and any products that have not been tested or failed to pass the test shall not be used.
Regarding the bearing capacity of fasteners, the construction load on the working layer should comply with the design requirements. It must not be overloaded and must bear a certain weight. The scaffolding must not be connected to the formwork bracket. Certain treatments must be carried out when connecting to ensure that the fasteners reasonable carrying weight.