关于根管桩材料和设计的研究已日益成熟。
The material and design of root canal post has already been well investigated.
试验结果表明：现浇薄壁管桩成桩质量好，承载性能好。
It was shown that the piles were of good quality and high bearing capacity.
不同浅层地基处理法下PHC管桩水平承载性状对比尚缺乏研究。
The behavior of PHC pipe piles under lateral load is lack of research now.
无桩尖管桩锤打过程易造成管桩移位、内伤、断桩、嵌岩差、持力层锚固长度小。
Shift, internal injury, breaking, bad imbedded in rock, as well as short anchorage distance etc.
无桩尖管桩锤打过程易造成管桩移位、内伤、断桩、嵌岩差、持力层锚固长度小。
Shift, internal injury, breaking, bad imbedded in rock, as well as short anchorage distance etc.
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