SLJ900
The SLJ900 / 32 is a special construction equipment for construction of bridges in prefabricated construction of Beijing Wowjoint Machinery Company . The 580-ton machine is 91 meters long and 7 meters wide. The device is particularly suitable for long, high valley bridges, where the classic in-situ concrete construction would devour enormous costs for formwork and armor . Due to the very high weight of the device and the different load conditions of the device during installation, the bridge must be dimensioned more massive than would be necessary for the later use of the bridge.
Use and construction
In the first step the bridge piers including (possibly provisional) supports are produced. At the same time, the bridge superstructure is being produced in individual parts in the precast plant. Contrary to the previously common construction method, in which the precast elements are only a few meters long, the precast elements are manufactured in full field length so that after assembly they reach from one bridge pier to the next bridge pier. After hardening, the finished parts are transported from the SLJ900 to the construction site. The machine then moves the finished part to the desired location. The way the SLJ900 works is similar to a track construction machine . The time-lapse video linked below documents the use of the device for the construction of a segmented railway bridge between the cities of Chongqing and Wanzhou in the Sichuan province in central China .
After the prefabricated parts have been moved, further work is necessary before the bridge can be opened to traffic. In addition to the installation of carriageway transitions between the individual prefabricated parts, the prefabricated parts must be securely locked . Furthermore, z. B. still the superstructure can be applied and railings / guard rails are mounted.
The SLJ900 / 32 runs on 64 wheels, which are arranged in four groups of 16 wheels. Each unit can swivel 90 degrees so that the whole device can also move sideways.
Web links
- Time lapse video on YouTube
- Rejection of the bridge construction monster article by VDI Nachrichten