蒸发器芯体焊接夹具的改进与优化设计

通过对某车用空调总成蒸发器芯体组焊焊接夹具的改进与优化设计,使原夹具在使用中存在的一些问题得到妥善解决和有效控制,使得组焊焊接操作得以流水化进行,极大地提高了生产效率,并使产品的尺寸与位置精度以及芯体的外观和表面品质也得到了保证。     

An improved general bidirectional progression model for arterial

Optimal control of arterial signals is critical for the effective operation of urban road network. With the goal of providing reasonable allocation of bidirectional green time while maximizing general bidirectional traffic progression along the arterial, this paper develops an improved general bidirectional coordinated progression model for arterial based on Maxband model. In the model, a proportional coefficient of bidirectional bandwidth demands is introduced and calibrated by adopting average link queue occupancy. The calibration method takes full account of actual traffic volume and capacity of each link, which helps to provide optimal control performance. Additionally, new constraints are added into the model and enable the model with two features: it can automatically select two-way or one-way progression, and the involved intersection unit can be either one-phase-one-approach or bidirectional symmetric release mode. The results of extensive simulation studies indicate that the improved model outperforms existing methods, markedly increasing the utilization of available bidirectional green time.     

混凝土连续箱梁现浇施工技术

跃进渠大桥为衡德公路第5合同段内的一座大桥,全长171．22 m。上部为20．55 m 5×25 m 20．55 m单箱双室预应力连续箱梁,主要以跃进渠大桥箱梁为例介绍后张法预应力混凝土连续箱梁现浇施工控制技术。     

深水钻孔灌注桩基础施工技术

针对济阳黄河公路大桥钻孔灌注桩桩身长、孔壁易失稳垮塌、单桩混凝土灌注量大等施工难题,通过合理机械选型和控制护壁泥浆配比,取得了良好效果。以4#主墩为例介绍了施工条件及钻孔灌注桩施工技术措施,总结了施工效果。