| 摘要 |
<p>The system is for concreting high rise structures, erected by means of climbing cranes. The crane tower, mounted on a baseplate, is enclosed by its own and a baseplate slewing ring, the two being spaced apart. In the working position, a derricking concreting jib extends obliquely upwards from the baseplate slewing ring, being supported by derricking ropes etc. from the tower and equipped with a concrete supply pipe. In the tower the concrete pipe is taken to a device allowing slewing movement and fixed to the tower. The device is actuated by a connecting pipe leading to the section of concrete pipe on the concreting jib itself.</p> |
