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第一机械工业部第一设计院和建工部建筑科学研究院等单位共同設計的12米跨、超重量为150吨的中級工作制予应力鋼筋混凝土吊車梁,經过試制試驗,証明完全能滿足设计要求,并已决定在某重机厂重点試用。現将設計、試制、試驗情况,及个人的一些看法,分述于后,供读者参考。一 設計 1.结构方案的选擇 予应力鋼筋混凝土吊車梁的結构形式有梁式及桁架式两种。桁架式吊車梁自重輕,混凝土及鋼材的消耗量少,这是它的优点。但是接点构造复杂,接点处鋼筋排列很密,施工比較困难。其次,桁架式吊車梁应力传递及分布情况复杂,若設計不周,在接点附近可能过早地出現裂縫,对結构的耐久性及疲劳强度均有不利的影响。另外,桁架式吊车梁截面的高度大,但
The first design institute of the Ministry of Machinery Industry and the Construction Science Research Institute of the Ministry of Construction and Engineering jointly designed a medium-duty steel reinforced concrete crane beam with a 12-meter span and an overweight of 150 tons. Through trial tests, it was proved to be fully capable. Satisfy the design requirements and have decided to focus on trials at a heavy machine factory. The design, trial production, experimentation, and personal views are now described for the reader’s reference. 1. Design 1. Selection of structural options Prestressed reinforced concrete crane girders have two types of beams and trusses. Truss crane beams have light weight and less consumption of concrete and steel. This is its advantage. However, the contact structure is complicated, and the arrangement of the reinforcing bars at the joints is very dense and the construction is difficult. Secondly, the stress transmission and distribution of trussed crane beams are complicated. If the design is poor, cracks may appear prematurely near the joints, which has an adverse effect on the durability and fatigue strength of the structure. In addition, the cross-section height of the truss crane beam is large, but