The paper introduces the influence of mud proportion on the excavated hole, the hole cleamng of the cast-in-place and concreting.
介绍了泥浆比重对钻孔灌注桩成孔、清孔及混凝土灌注的影响，并提出相应的技术措施。
2
The construction of a new type anti-pitting tappet with a castholein its end face and isothermally treated are described.
介绍了端面直接铸孔并进行等温处理的新型抗点蚀挺杆体的结构和热处理工艺；
3
Investigation on the loudspeaker shaped gas hole morphology in tin bronze sleeves cast by centrifugal casting have been carried out by optical and scanning electron microscope observation.