预拌喷射混凝土干料及施工工艺分析

Analysis of Ready-mixed Shotcrete Dry Material and Construction Technology

预拌喷射混凝土干料适用于隧道及地下工程的初衬支护、各种结构加固、市政管廊暗挖及明挖施工作业、建筑基坑边坡支护等工程。通过介绍现阶段喷射混凝土技术现状及特点,分析现场搅拌喷射混凝土缺点;通过阐述相关标准的性能指标、配合比设计思路,分析预拌喷射混凝土干料性能;通过了解预拌喷射混凝土干料运输方式、贮存方式、配制方式、施工流程及施工要点,分析预拌喷射混凝土干料施工工艺。在预拌喷射混凝土施工阶段,受喷面检查及标识设置、喷射顺序、喷射速度、喷射厚度和养护方式都会影响施工质量,因此提出相关施工工艺注意要点,为预拌喷射混凝土实际工程应用提供参考。

Ready-mixed shotcrete dry material is suitable for the initial lining support of tunnel and underground engineering,various structural reinforcement,underground excavation and open excavation construction of municipal pipe gallery,slope support of building foundation pit and other projects.By introducing the current situation and characteristics of shotcrete technology,analyzes the shortcomings of on-site mixing shotcrete;by elaborating on the performance of ready-mixed shotcrete dry material through the performance index analysis of relevant standards and the design idea of mix proportion;by understanding the transportation,storage,preparation,construction process,and key points of ready-mixed sprayed concrete dry materials,analyzes the construction process of ready-mixed sprayed concrete dry materials.During the construction stage of ready-mixed shotcrete,the inspection and identification of the sprayed surface,the spraying sequence,spraying speed,spraying thickness,and curing method all affect the construction quality.Therefore,the article proposes key points for attention in the construction process,providing reference for the practical engineering application of ready-mixed sprayed concrete.