上模为中部开有锥形焊口的铜制模块，焊口位置与底模熔池对应。
The copper-made die block in which a conical welding opening is bored is arranged on the middle part of the upper die.
公路桥梁预制钢筋混凝土板梁施工中，底模的制作及脱模是关键。
Fabricating and demoulding of the base mould is a key during the course of construction for precast plate girder of highway bridge.
结合某岛礁防波堤护底施工实例，介绍了模袋混凝土技术的施工方法与注意事项，为类似的工程提供参考和借鉴。
This paper takes the works of breakwater apron as an example to introduce the construction technique of bagged concrete and relate the important matters, which will help us with relevant works.
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