down gate是什么意思

用法例句

00 m was concrete of Grade C30 and F300,considering the tight construction schedule and high quality demand of the project,it was not allowed to place the second lift of concrete for the height in the designs,therefore,the construction technology for underwater pouring of frost resistance concrete was adoped and satisfactory resul.

00 m为C 30,F 300抗冻混凝土,考虑到该工程工期紧且为保证工程质量,设计要求在该处不能进行二次接高,为此在施工中采用了抗冻混凝土水下浇注的施工技术,并收到了良好的效果。

Influence of underwater casting on mud solidification;

现场水下浇筑对淤泥固化效果的影响

The measure of improving the durability of the underwater casting concrete;

提高水下浇筑混凝土耐久性的措施

This paper introduces the requirements for the selection of raw materials in the construction of underwater engineering, expounds the performance and design of mix proportion of the tremie concrete, and probes into the reasons of the common accidents of the tremie concrete and the settlement measures.

介绍了水下工程施工中原材料的选择要求,阐述了水下浇注混凝土的性能及配合比设计,对水下混凝土常见事故原因与处理措施进行了探讨。