The bridge erecting machine is a device that puts the prefabricated beam on the prefabricated pier. The bridge crane belongs to the category of cranes, because its main function is to lift the beam piece, and then transport it to the position and lower it.
The bridge erecting machine is a device that puts the prefabricated beam on the prefabricated pier. The bridge crane belongs to the category of cranes, because its main function is to lift the beam piece, and then transport it to the position and lower it. But it is very different from the crane in the general sense. The requirements are harsh, and there is walking on the beam, or it is called vertical displacement. The bridge erecting machine is divided into several types such as road bridges, conventional railway bridges, passenger railway bridges and so on.
One of the bridge construction machinery, the Soviet Union used it earlier. 年引进时，其前后臂都用钢板梁，吊重有 45 吨和 80 吨两种。 When it was introduced in 1948 , its front and rear arms were made of steel plate beams, with lifting weights of 45 tons and 80 tons. 年代，将双臂改为构架，吊重发展到 130 吨。 In the 1950s, the arms were changed to a frame, and the weight was developed to 130 tons.
This type of bridging machine cannot be used by itself, and it needs to be pushed by the locomotive. Its forearm is used to lift the beam, and the rear arm is suspended from the balance weight. The front and rear arms cannot swing in the horizontal plane. 吨小平车将梁片运到架桥机前臂的吊钩之下（称为“喂梁”）才能起吊；为使调车作业方便，每需在桥头铺设岔线。 When erecting a bridge, it is often necessary to use a special 80- ton flat car to transport the beam piece under the hook of the forearm of the erecting machine (called "feed beam") before lifting; in order to facilitate the shunting operation, it is necessary to lay a fork at the bridge head. line. After the bridge crane lifts the beam, the axle weight increases, and the newly built embankment at the bridge head is relatively soft. Therefore, reinforcement measures must be taken on the driving section of the bridge crane crane beam, such as using heavy vehicles to press the road, and add sleepers.
Double beam bridge erecting machine
吊重也是 130 吨。 Red flag bridge cranes and prototype bridge cranes belong to this category , and their lifting 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 protrude forward and backward. At both ends there are folding columns consisting of two-legged poles. 3.4 米 , 燎原型的则为 4.8 米。 The central distance between the two beams of the red flag type is 3.4 meters , while that of the prototype is 4.8 meters. , 能沿吊臂纵向行驶。 There are two trusses spanning two box beams , which can travel longitudinally along the boom. The hanging beam trolley is placed on the truss car and can drive along the truss transversely. , 再以吊梁小车横移 , 然后落梁就位。 The beam piece (or the entire beam) to be framed can be directly delivered to the under arm of the bridge crane by a railway flatbed. After being lifted with a crane beam trolley, it is moved forward by the truss trolley , and then moved horizontally by the crane beam trolley . Bit. " 喂梁 " 也不需要桥头岔线或特制运梁车。 Both the front and rear ends of this type of bridge erecting machine can be used for hanging beams and falling beams; when changing the direction of the girder, there is no need to turn around; in order to adapt to the curved girder, both the front and rear arms can swing in the horizontal plane; Road, the beam can be put into place; the " feed beam " does not require a bridgehead fork or a special beam carrier.
The beam must be laid immediately after the beam is erected so that the bridge crane can continue to work forward. The latter two types of bridge cranes can generally hoist the pre-assembled rail rows into place, so that the beam erection work will not cause delays due to rail laying.
In addition to the above-mentioned standing bridge cranes, the construction unit sometimes makes various temporary bridge cranes as needed. 吨的专用架桥机 , 以整孔架设跨度 40 米的无碴无枕预应力混凝土梁。 For example, in the construction of the approach bridge on the south bank of Jiujiang Bridge, a special bridge-building machine capable of lifting 300 tons was built , and a 40- meter-long ballastless and pillowless prestressed concrete beam was erected with the entire hole . Some construction units also often use simple steel scaffolding, dismountable beams or military beams to form simple bridge erectors to complete bridge erection tasks in a timely manner.
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