Safe Operation Guide in Bailey bridge construction

Bailey bridge has a series of advantages such as simple structure, strong adaptability, good interchangeability, convenient disassembly and assembly, and fast erection speed, but in the process of actual construction, it will inevitably be affected by various factors, and various quality problems and safety incidents occurred. This paper proposes several construction safety and quality assurance measures for the reference of relevant persons.

▼When inserting the pin, pay attention that the safety pin hole should be placed horizontally to facilitate the insertion of the safety pin;

▼When any component encounters difficulty in installation, the reason should be found out and must not be forced to be installed;

▼The front and rear trusses must be adjusted at any time to ensure that they are in a straight line and must not be bent;

▼ After the concrete pouring is completed and the initial setting is completed, it should be sprayed for health care immediately, and the health period should be maintained for more than 7 days;

▼The construction of  bailey bridge  implements the policy of "safety first, prevention first", and strictly implements the safety production responsibility system;

▼ During the construction of bailey bridge, regularly check the safety pins of the truss connecting pins, and whether various bolts, transverse braces, diagonal braces, etc. are loose;

▼Concrete is carried out in strict accordance with the mix ratio selected by the test center, and the concrete is poured in layers. When vibrating, the lower layer should be inserted not less than 5cm, and the vibration radii overlap and advance in sequence. Each rod reaches the concrete surface and sinks in place, and the bubbles can be discharged after the grouting on the top;

▼Strictly check the truss and supporting components used in the construction of this project, especially the raw materials of the truss, the welding quality, the material and heat treatment of the truss connecting pins, etc. The truss and components with poor maintenance and corrosion of the connecting welds and components shall not be allowed. use;

▼During the construction of the bailey bridge, a cordon must be set up within the hoisting range of the Bailey frame, and no one shall stand within the cordon during the hoisting operation; when the hoisting equipment is hoisted, it is strictly forbidden to lift objects exceeding the specified weight, and shall not be used to transport personnel; hoisting and hoisting The steel wire rope used should be checked frequently, and if any damage is found, it should be updated in time; before lifting, the binding condition of the steel lifting point and the operator's employment certificate should also be checked, and a special person should be sent to command