蚌埠淮河大桥栓焊梁施拧φ22、40B螺栓(钣束厚度20～114mm,其中56～72mm的较多)时,起初仅有工地自制带响定扭矩扳手10把(制造图见本刊71年第1期“土法制成带响定扭扳手和油压定扭扳手”)。在当时条件下,经过工人、干部、技术人员“三结合”研究,并吸取612大桥和4921大桥的经验,确定主桁大节点主要部位(弦杆、斜杆、竖杆)按圈数拧紧法为基础,以带响定扭矩扳手为基本 Bengbu Huaihe Bridge bolt welding beam φ22,40B Bolt (sheet bundle beam thickness of 20 ~ 114mm, of which 56 ~ 72mm more), initially only the construction site with a ringing torque wrench 10 (see Figure 71 No. 1 “made of indigenous law with adjustable torque wrench and hydraulic torque wrench”). Under the condition of that time, through the “triple combination” of workers, cadres and technicians, and drawing on the experience of 612 Bridge and 4921 Bridge, it was confirmed that the main parts (chord, diagonal bar, vertical bar) As the basis, with a ringing torque wrench as the basic