深竖井桁吊钢支撑结构选型设计与应用

The Type-Selecting Design and Application of Steel Truss Support Structures for Deep Shafts

TBM竖井提升出渣多采用龙门吊方式。因龙门吊设计结构尺寸大,为提升出渣效率,采用多组桁吊同步作业施工,由于竖井净空跨度大,会造成桁吊梁挠度过大,为增强结构稳定性,故需要在竖井内增加桁吊支撑结构为桁吊梁减跨,以满足桁吊运行条件。介绍了三种立柱结构形式,从不同方面进行了结构比选。通过采用在深竖井内增加钢结构支撑方案,解决了桁吊梁因竖井净空跨度大而产生的桁吊梁挠度问题。

Gantry cranes are often used to lift slag from TBM shafts. Because the designed structure of a gantry crane is large in size, the multi-group truss cranes are often used to operate synchronously to improve the efficiency of slag discharge. However, owing to the large clearance span of the shaft, the deflection of the truss crane may be too large, as result of which the number of truss support structures has to be increased to enhance the stability of structure so as to shorten the span of the truss girder and help meet the operational conditions of the truss cranes. Upon the basis of introducing three structural forms of posts, the type-comparing and type-selection are carried out from various angles in the paper. Through increasing the number of steel truss supports in shafts, the problem of the deflection of the truss girder being too large resulting from the large clearance span of the shaft is successfully solved.