The bridge erecting machine is the equipment that places the prefabricated beams on the prefabricated bridge piers. The bridge erecting machine belongs to the category of construction hoist
s, because its main function is to lift the beams, then transport them to the location and then put them down. But it is very different from the crane in the general sense. The requirements are harsh, and there is a traveling on the beam, or it is called a longitudinal shift. Bridge erecting machines are divided into several types, such as erecting highway bridges, conventional railway bridges, and passenger dedicated railway bridges. The bridge erecting machine is the equipment that puts the prefabricated beams on the prefabricated bridge piers. The bridge erecting machine belongs to the category of cranes, because its main function is to lift the beams, then transport them to the location and then put them down. But it is very different from the crane in the general sense. The requirements are harsh, and there is a traveling on the beam, or it is called a longitudinal shift. Bridge erecting machines are divided into several types, such as erecting highway bridges, conventional railway bridges, and passenger dedicated railway bridges. One of the bridge construction machinery, this type was used earlier in the Soviet Union. When it was introduced in 1948, its front and rear arms were made of steel plate beams, and the hoisting weight was 45 tons and 80 tons. In the 1950s, the double arms were changed to frames, and the lifting weight was developed to 130 tons. This type of bridge erecting machine cannot be driven by itself and needs to be pushed by a locomotive. The forearm is used to hang the beam, the rear arm hangs the balance weight, and the front and rear arms cannot swing in the horizontal plane. When erecting a bridge, it is often necessary to use a special 80-ton small flat car to transport the beam piece under the hook of the forearm of the bridge erector (called 'beam feeding') before lifting; to make the shunting operation convenient, it is necessary to lay turnouts at the bridge head. line. After the girder is hoisted by the bridge erector, the axle load increases, and the newly-built embankment at the bridge head is relatively soft. Therefore, reinforcement measures must be taken for the section where the girder is lifted by the bridge erector, such as pressing the road with heavy vehicles and inserting sleepers. The double-beam bridge erecting machine Hongqi bridge erecting machine and the Liao prototype bridge erecting machine belong to this category, and the hoisting weight is also 130 tons. The boom is composed of two box beams on the left and right. The two beams penetrate the fuselage and extend forward and backward. There are folding uprights composed of two-legged rods at both ends. The middle distance between the two beams of the red flag type is 3.4 meters, and that of the Liao prototype is 4.8 meters. There are two truss cars across the two box beams, which can travel along the longitudinal direction of the boom. The beam hanging trolley is placed on the truss vehicle and can travel laterally along the truss vehicle. The beam piece (or the whole beam) to be erected can be directly sent under the rear arm of the bridge erecting machine with a railway flat car. After being lifted by a beam crane, it is moved forward with the truss car, and then moved horizontally by the beam crane, and then the beam is dropped. Bit. The front and rear ends of this type of bridge erecting machine can both hang and drop beams; when changing the direction of the beam, there is no need to turn around; in order to adapt to the curved beam, the front and rear arms can swing in a horizontal plane; The beam can be placed in place after the road; “feeding the beam” does not require a bridge head fork line or a special beam transport vehicle. After the beam is erected, the track must be laid immediately before the bridge erecting machine can continue to work forward. The latter two types of bridge erecting machines generally can hoist the pre-assembled rail row in place, so that the girder erection work will not cause delays due to track laying. In addition to the above-mentioned standing bridge erecting machines, construction units sometimes produce various temporary bridge erecting machines according to their needs. For example, in the construction of the approach bridge on the south bank of the Jiujiang Bridge, a special-purpose bridge erecting machine with a lifting weight of 300 tons was used to erect a ballastless and pillowless prestressed concrete beam with a span of 40 meters in the whole hole. Some construction units also commonly use standing steel scaffold members, dismountable beams or military-use beams to form simple bridge erecting machines to complete the bridge erection tasks in time.
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