•350T 履带吊 (CC2800-1)
•24 轴线 SPMT
The operation involves three distinct phases:
1. Transport and assembly of a tunnel boring machine (TBM) to a site in The Hague.
2. Intermediate transport of TBM parts back to the launch shaft after boring of the first tunnel.
3. After boring of the second tunnel, disassembly and transport of the TBM.
Sarens recently completed Phase 2 of the project. To do phase 3, Sarens had to first disassemble the TBM, transport it piece by piece, and then reassemble it so that it could bore a second tunnel.
This operation came with very particular challenges, however. For example, the last part of the TBM to be disassembled was also the first part required for reassembly. The team had to carefully plan the entire transfer operation so as to minimize downtime.
Furthermore, while most of the TBM parts could undergo normal road transport, six parts had to be specially transferred by SPMT and barge due to their weight and dimension. These shield parts measured approximately 8.4 x 8.4m with a 130T main drive and, most notably, a 115T cutting wheel with an 11,8m diameter.
The cutting wheel could not be transported horizontally because both roads and bridges were too narrow to accommodate its size. To address this issue, Sarens created a support that allowed for vertical transport. The crew fixed the support to the cutting wheel so it could be lifted in one piece during transfer from the SPMTs to the barge, and then back to the SPMTs again.
For this transfer operation, Sarens used the following equipment:
•350T crawler crane (CC2800-1)
•24 axle lines SPMT
•Mobile cranes up to 700T
•River barge measuring 45x7x1.9 metres
All the TBM parts were transferred over the course of two nights, as the 700T crane had to be removed during the daytime to accommodate traffic on the public road. Additionally, the crawler crane used for disassembly had to be demobilized, transported, and remobilized at the reception shaft so it could assist with the TBM\'s reassembly.