这是因为手握着旋转式拧紧器，在H型钢的里侧不好操作。
This is because it is difficult to operate on the inner side of the H-beam with the rotary tightening device in hand.
连接H型钢时，高强螺栓的头置于翼缘内侧，螺母置于翼缘外侧是常见的施工操作方式。拧紧工具采用旋转式拧紧器。
When connecting H-beam, the head of high-strength bolt is placed inside the flange, and the nut is placed outside the flange. The tightening tool is rotary type.
大型H型钢无需在意螺母的位置，但是小型H型钢，由于腹板的存在会影响操作，必须注意高强螺栓的插入方向，要做到从里到外，保证螺母在外侧，便于安装操作。从下往上看时，螺母和螺栓是并行排列的。
Large H-beam does not need to pay attention to the position of nut, but for small H-beam, due to the presence of web, it is necessary to pay attention to the insertion direction of high-strength bolt, and ensure that the nut is on the outside from the inside to the outside, which is convenient for installation and operation. When viewed from the bottom up, the nuts and bolts are arranged in parallel.
在裸露式钢结构设计中，螺栓头位于翼缘外侧显得更加美观。如果要求设计效果，则可以采用手工操作的大六角型高强螺栓，此时可以将螺母置于翼缘内侧。
In the design of exposed steel structure, the bolt head on the outside of flange is more beautiful. If the design effect is required, the large hexagonal high-strength bolt can be used, and the nut can be placed inside the flange.
