Abstract The assembling process of prefabricated utility tunnels mainly depends on the tensioning and locking of prestressed steel strands to make pipe joints assembled in place. In the process of assembly and tensioning, whether the synchronization of tensioning is favorable and whether the joint tension is caused relaxed in the operation phase of the utility tunnel transport vehicle will produce a direct effect on the waterproof performance of the water stop joint of the utility tunnel joint. In order to explore the tensioning synchronization and prestress loss of steel strands in the process of utility tunnel assembly, the self-sensing steel strands with built-in optical fiber are used to conduct real-time monitoring of the tensioning process of utility tunnel assembly, verify the feasibility of intelligent steel strands used for tensioning monitoring, and analyze and evaluate the synchronization performance of the tensioning process and the degree of prestress loss. This method can provide technical support for the performance evaluation of the assembly and tensioning process of the long segment and large tonnage prefabricated utility tunnel.
Abstract：
The assembling process of prefabricated utility tunnels mainly depends on the tensioning and locking of prestressed steel strands to make pipe joints assembled in place. In the process of assembly and tensioning, whether the synchronization of tensioning is favorable and whether the joint tension is caused relaxed in the operation phase of the utility tunnel transport vehicle will produce a direct effect on the waterproof performance of the water stop joint of the utility tunnel joint. In order to explore the tensioning synchronization and prestress loss of steel strands in the process of utility tunnel assembly, the self-sensing steel strands with built-in optical fiber are used to conduct real-time monitoring of the tensioning process of utility tunnel assembly, verify the feasibility of intelligent steel strands used for tensioning monitoring, and analyze and evaluate the synchronization performance of the tensioning process and the degree of prestress loss. This method can provide technical support for the performance evaluation of the assembly and tensioning process of the long segment and large tonnage prefabricated utility tunnel.
ZHANG Yaodong1 LI Pengfei1 LI Qiangzhan2 FU Baiyong3 GUO Yawei3
.Application of Self-sensing Steel Strand with Built-in Optical Fiber in Assembly of Prefabricated Utility Tunnels[J] MODERN TUNNELLING TECHNOLOGY, 2022,V59(6): 170-176
2022, Vol. 59 