采用碱性药皮焊条和焊前接头预热的施焊方法，焊接的空间管道接头热应力小。
For overhead pipeline, welding with basic-compound coated electrodes and pre-welding heating of the joint will reduce the joint thermal -stress.
承包商应于接头安装后一周重新拧紧螺母，并就在轨道最终衬砌和整平前再一次拧紧。
The contractor shall retighten the nuts one week after joint installation and a second time just before final lining and leveling of the track.
需要时，绝缘接头应在轨道最终衬砌和整平前安装。
Insulated joints if required shall be installed just before final leveling and lining of the track.
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