人孔盖使用不锈钢螺栓和螺母拧紧。
Stainless steel bolts and nuts shall be tightened on manhole covers.
特别是下部行走体上的螺栓和螺母,很容易受到影响。
Especially in the lower part of body to walk on the bolts and nuts, it is easy to be affected.
理论质量包括卡箍、端管、密封橡胶圈、螺栓和螺母的质量。
Theoretical weight will be consisted of the weight of the clamps, end rings, sealing rubber rings, bolts and nuts.
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