What do experts tell you about bridge building

Recently, the Qilong Bridge was officially closed, and the last steel box girder weighing 290 tons was lifted smoothly by the bridge erecting machine. What is the bridge erecting machine “artifact”, why is it so “powerful”? Yesterday, China Railway 25 Bureau a company shop branch chief engineer He boliang accepted an interview with reporters, unveiled the mystery of the bridge erecting machine.

He Boliang said that before the bridge erection machine, in the construction of the bridge, the builder generally adopts the manual beam, the transverse movement of the beam sheet, the longitudinal movement of the beam sheet requires human synchronous drag, labor consumption, safety is not high, a little careless will appear serious safety accidents, and can only set up 100 tons of beam sheet. With the continuous innovation of science and technology, the emergence of bridge erecting machine has solved the greatest tonnage of beam sheet erection, from the beginning of 160 tons to today’s 900 tons, or even 1,800 tons, stability and safety have been greatly strengthened.

Since the 1990s, China has begun to demonstrate the possibility of manufacturing its own large-tonnage bridging equipment, and has achieved great success. With the increasing number of rail transit projects, especially the planning of the national “eight vertical and eight horizontal” railway network, the use of bridge erecting machines is more frequent.

He Boliang introduced that bridge erecting machines are mainly used in the erection of conventional railway Bridges and highway Bridges, such as the construction of Wuhan-Guangzhou high-speed railway and Beijing-Shanghai high-speed railway, which all use bridge erecting machines.

How “powerful” is the bridge erection machine? The 36 km long Hangzhou Bay cross-sea bridge is a miracle. During construction, the approach bridge on both sides of the bridge used 50 meters long double box girder, with a single hole box girder weighing 1430 tons. It is expected to be equipped with 1600 tons of tyre type beam lifting machine, beam transport car and bridge erecting machine for loading, transporting and erecting beams. The construction experience of this super large equipment is almost the first in the world.

In fact, when the Qilong Bridge was closed, only common bridge erecting machines were used. In the past construction of Foshan traffic projects, this kind of bridge erection machine has also been used. According to He Boliang, during the Foshan section of the Guangzhou-Nanzhou-Guangzhou high-speed Railway project, a 141-ton T-beam was erected on the bridge pier.

In our province, bridge erecting machines appear in major transportation projects. For example, Wu-Guangzhou high-speed railway, Xiamen-Shenzhen railway, Dongguan-Huizhou intercity and other high-speed railways with speeds above 200 km/h (250 km/h reserved) or passenger dedicated railway and intercity railway are all using box girder girder erecting machine, which is 900 tons or 700 tons of box girder; In addition, there are Guangzhou-Zhuhai railway, Guiguangnan-Guangzhou Railway, Shenmao Railway, Northeast freight truck outside winding railway and other passenger and cargo common line railway or freight line railway using T-beam bridge erecting machine, is 140 tons of T beam.

Beginning this year, Foshan will also build many rail transit projects including Foshan Metro Line 3, and in the Foshan West Extension project and other high-speed projects, will build more large Bridges such as Qilong Bridge, these huge machinery is setting off a “machine mobilization” in Foshan.