這是因為手握著旋轉式擰緊器，在H型鋼的里側不好操作。
This is because it is difficult to operate on the inner side of the H-beam with the rotary tightening device in hand.
連接H型鋼時，高強螺栓的頭置于翼緣內側，螺母置于翼緣外側是常見的施工操作方式。擰緊工具采用旋轉式擰緊器。
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型鋼無需在意螺母的位置，但是小型H型鋼，由于腹板的存在會影響操作，必須注意高強螺栓的插入方向，要做到從里到外，保證螺母在外側，便于安裝操作。從下往上看時，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.
在裸露式鋼結構設計中，螺栓頭位于翼緣外側顯得更加美觀。如果要求設計效果，則可以采用手工操作的大六角型高強螺栓，此時可以將螺母置于翼緣內側。
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.
