自行走式隧道施工中装配式塑料管道连接方式试验及模拟研究

Experimental and simulation studies on rational support form of prefabricated plastic pipe in self-drive advancing construction

基于优选出的装配式塑料管道的拼装形式,选用钢板螺栓连接管片形成装配式塑料管道,研究此连接形成管道的支护强度、管道变形等相关参数,为新型自行走式隧(管)道施工提供配套支护技术。选择钢板厚度和螺栓的拧紧扭矩作为试验的2个因素,在环刚度试验机上对分片拼装后的管道进行承压试验。以塑料管道在径向变形达到15%时的承载力作为承载极限,经对试验结果分析后选出最佳的钢板厚度和螺栓扭矩。结果表明,以拼接缝与铅垂线成45°的圆周4片拼装形式,3 mm厚的钢板配合10 N.m的螺栓预紧力,可使其承压能力较整体式管道有一定提高。应用ABAQUS软件对该连接方式进行建模,定性分析得出,聚乙烯(PE)中空壁缠绕管采用3 mm钢板连接后的承压反力高于采用4 mm钢板连接的承压反力,从而也验证了试验结论。

Based on the selected optimal plastic pipe connection form,prefabricated plastie pipe is assembled by choosing steel bolted connection pipe,and the supporting strength,pipe deformation and other related parameters are studied,providing associated support technology for new self-drive advancing tunnel（pipe） construction. Pressure test is carried out on the prefabricated pipe on the ring stiffness test machine by choosing the thickness of the steel plate and tighten torque of the bolts as two experimental factors. The bearing capacity when the plastic pipe in radial distortion reaches 15% is taken as limit capacity. Optimal plate thickness and bolt torques are selected after analyzing the test results. The resuhs show that the pressure bearing capacity the prefabricated plastic pipe has certain improvement compared to integral type pipeline when adopting four pieces assembly form of circle with seamline and the plumbline of 45%3 ram-thick steel plate and 10 N·m pretighteuing force. ABAQUS software is adopted for modeling of such connection mode. The qualitative analysis results show that enunterforce of PE hollow wall winding pipe connected with 3 mm-thick steel plate is higher than that connected with 4 mm-thick steel plate,which also verifies the experimental conclusion.