2.1  跨度 S                                                                                                                                                                   2.2  起重机高度 H                                                                                                                                                      2.3  起重机宽度 B  Crane width  起重机运行方向前后最外端的距离                                                                      2.4  小车轨距 K                                                                                                                                                          2.5  大车（起重机）基距 W                                                                                                                                        2.6  小车基距 W c                                                                                                                                                      2.7  缓冲器高度 H 1  Buffer height  大车缓冲器纵向中心线到起重机轨道顶面的距离                                      2.8  主梁底面位置 H 2  Position of bottom plan of main girder  主梁底面到起重机轨道顶面的距离                      2.9 司机室底面位置 H 3  Position of bottom plan of cab  司机室底面到起重机轨道顶面的距离                            2.10 主钩上极限位置 H 4  Main hook approach to cane rail top  主钩最高位置到起重机轨道顶面的距离          2.11 副钩上极限位置 H 5  Auxiliary hook approach to cane rail top  副钩最高位置到起重机轨道顶面的距离      2.12 主钩左极限位置 C 1  Main hook approach to cane rail top （ left side ）  从传动侧看，主钩横向左极限位置
2.13 主钩右极限位置 C 2  Main hook approach to center of crane rail （ right side ）  从传动侧看，主钩横向右极
2.14 副钩左极限位置 C 3  Auxiliary hook approach to center of crane rail （ left side ）  从传动侧看，副钩横向左极限位置  
2.15 副钩右极限位置 C 4  Auxiliary hook approach to center of crane rail （ right side ）  从传动侧看，副钩横向右极限位置    
2.16 司机室水平位置 L 1  Distance between cab and rail  司机室外端离起重机轨道中心线的距离                       2.17 司机室底长 L 2  Bottom length of cab  司机室底部长度                                                                                    2.18 起重机轨道中心至起重机外缘距离 b  Dimension from rail center to crane edge  起重机桥架方向的外缘离起重机轨道中心线的距离   
2.19 主梁上拱度  camber  主梁预制的由水平线算起的向上拱起量