磁力摩擦式辅助驱动在TBM连续皮带机中的应用

长大隧道TBM(tunnel boring machine)施工大多采用连续皮带机出渣,当运输距离较大时通常需要在中间增设辅助驱动,以降低胶带最大张力,从而降低胶带强度。为了提高辅助驱动的工程适应性,研发了磁力摩擦式辅助驱动系统,具有驱动力大、无二次转载、胶带无二次冲击损伤、结构简单、故障点少、结构紧凑占用空间小、安装方便和配置灵活等特点。该成果可用于采用钢丝绳芯胶带的TBM连续皮带机、支洞皮带机以及其他需要辅助驱动的胶带输送机,并在山西省中部引黄工程TBM1标段成功应用,具有广阔的推广应用价值。

山西中部引黄工程长距离TBM运输系统方案研究

山西省中部引黄工程输水隧洞在穿越黑茶山自然保护区时采用TBM法进行施工,独头掘进距离长,其长距离出渣系统及物料运输方案设计成为了制约工程进展的重要因素。文中利用磁力摩擦式中间加力驱动系统对连续皮带机出渣系统进行了设计,并对物料运输方案进行了计算,确定了运输调度制度,经现场实践证明,可以满足独头掘进26 km的需要,为类似工程运输系统设计提供了经验。

Passive control experiment of building with spacious first story by magnet-friction energy dissipation device

Based on the former performance capacity experiments of the magnet-friction energy dissipation devices, including the permanent magnet-friction energy dissipation device (PMF) and electromagnet-friction energy dissipation devices (EMF), a 5-story steel frame model with spacious first story is designed and made according to a scale of 1/4. The magnet-friction energy dissipation devices can realize continuously varied controlling force, with rapid response and reverse recognition. Therefore, they overcome shortcomings usually found in energy dissipation devices whose force models are invariable. The two kinds of devices were fixed on the flexible first story of the structure model, and the shaking table tests have been carried out, respectively. In these tests, the performance of the devices and their effectiveness in structural control were confirmed. In this paper, the test results and analysis are discussed.

TBM隧道连续皮带机辅助驱动方案经济性分析

详细阐述TBM隧道连续皮带机滚筒转载式和磁力摩擦式辅助驱动的工作原理及驱动方式,并依托山西中部引黄工程输水隧洞,从设备采购成本、维修成本、综合成本等方面对两种辅助驱动的经济性进行对比分析。研究结果表明:磁力摩擦式辅助驱动可避免渣料高位卸载转运对皮带造成的冲击,有助于降低皮带故障率,减少皮带维修时间及成本;采用磁力摩擦式辅助驱动在工程初期投入较高,但综合成本相对较低,对于早期资金较为充裕的工程而言,宜选择磁力摩擦式辅助驱动进行施工。