Beam Launching & Bridge Girder Erection Industry
Bridges are overhead structures with carrying capacity for railroads, highways, pipelines, etc., to crossing rivers, valleys, or other obstacles. The gantry and girder cranes provide the mechanical foundation for the construction of the bridge, which can improve the efficiency of transporting heavy loads and building the bridge. In particular, the girder machine is specially designed for bridge construction. The members are connected by high-strength bolts, which is easy to disassemble and transport. It can be hoisted at the same time by two sets (the maximum lifting weight of a single set is 450T) or by a single set (the maximum lifting weight of a single set is 900T).
Bridge girder erection machine merges an adaptation of a wide range of work, excellent performance, convenient operation, safety structure into a single whole. It has the steel structure of rail type precast beam hoisting rack equipment. This product can be used not only in plain construction, but also to meet the construction of mountain highway slope, small radius curved bridge, skew bridge and tunnel bridge requirements.
The bridge girder erection machine consists of main girder, crane, front legs, rear legs, front leg cylinder, rear leg cylinder and the transverse connection of front, middle, rear legs. The control part is composed of hydraulic system and electric control system. The bridge girder erection machine is characterized by reasonable compact structure and convenient installation, the main standard girder is connected by pin connection. The double girder structure is connected between the two frame girders by welded pipe.
The beam launching is very different from a crane in the normal sense of the word. Its requirements are demanding and there are girders walking on pieces, or called longitudinal movement. The bridge erector is divided into
1. highway bridge erector,
2. railway bridge erector,
3. public-railway bridge erector,
4. high-speed railway bridge erector,
5. section assembly bridge erector,
6. mobile moulding bridge erector.
The road and railway bridge erectors are generally single girder structures, the bridge builders are different from the bridge erectors in that the erectors are prefabricated girders placed on the piers, while the bridge builders have mould that can be poured directly on site.
Highway Bridge Erector
Railway Bridge Erector
High-speed Railway Bridge Erector
Water Bridge Erecting Machine
The bridge erecting machine can simultaneously lift two prefabricated beams, and a single gantry crane equipped with dual lifting equipment can lift prefabricated beams separately. The lifting capacity of two cranes simultaneously is generally 450 tons, and the lifting capacity of a single crane. The weight can usually reach 900 tons. The lifting beam bridge erection crane can achieve all-round mechanical action, mainly used to lift prefabricated beams from the beam making platform to the beam storage platform. After the prefabricated beams are completed, they are lifted from the beam holding platform to the beam transport vehicle. As a lifting device, complete the assembly and disassembly of the bridge erecting machine. It is also used to build low bridges. The boom is the main load-bearing beam of the bridge, which is a double box girder structure. Based on the force situation of the boom and finite element analysis, design each box beam as a box deformation section.
However, as the bridge erector is a large-scale special equipment for bridge installation, the safety factor at the construction site is required to be high. In addition to having professional personnel on site to direct the bridge erector, the speed requirement of the bridge erector is generally low and runs relatively slowly, which also ensures safety.
