钢筋保护层厚度的控制技术及标准化研究

发布时间：2018-12-11 01:56

【摘要】：目前，建筑施工越来越规范化，但是保护层厚度的控制方面却仍然存在很多问题，常常出现新建项目没有或刚投入使用，，就因保护层控制不力出现裂缝、结构破坏现象，严重影响耐久性。本文主要通过工程调研、现场检测、专利研发和文献查阅等方法对钢筋保护层厚度的设计、施工、检测和垫块马凳设置等方面进行研究，给出了一种验算保护层厚度可靠性的计算方法，研发了一套自成体系的垫块马凳产品，提供了一种垫块马凳设置、验收的施工指导建议，为广大设计、施工和管理人员提供了一套行之有效的保护层控制方法。具体研究内容概述如下： 1)结合国内外对于保护层厚度设计的研究现状，对钢筋混凝土保护层承担的作用和要求进行了分析总结； 2)对比国内外规范中关于保护层厚度的规定，分析了我国保护层厚度最小值的规定存在几方面的问题，和距离国外相应规范的差距； 3)结合目前已有的一些碳化、锈胀开裂模型，采用概率法分析了碳化与锈胀开裂作为耐久性寿命标准时，保护层厚度与可靠度的关系，为计算保护层厚度的可靠性或验算保护层是否足够提供了一种方法； 4)通过对实际工程调查、现场检测以及对保护层控制现状的研究，分析总结了在建筑工程实际中，保护层控制在设计、施工、检测和垫块马凳设置等方面仍存在的问题。并以此为依据，针对性的设计开发了一套钢筋定位产品，同时进行了经济社会效益评价，解决了现有技术在负筋、箍筋、竖向钢筋等定位过程中存在的各种问题； 5)针对目前垫块马凳设置方面尚无详细、规范的施工指导标准，结合云南省地方标准和国外相关规范，对各种材质的垫块和马凳进行分类，针对各种构件，分别对垫块和马凳的选用、设置间距、设置标准和验收标准进行了详细的建议，并对垫块马凳自身的强度、稳定性和抗滑移能力进行了研究，开发了部分验证垫块马凳自身性能的专利，供设计和施工人员选用； 6)通过现场检测，分析了钢筋位置测定仪和雷达仪的保护层厚度检测原理、方法和仪器存在一些问题；并对实际参加的工程检测鉴定的检测数据，和青岛数个工程项目的保护层厚度检测验收的数据进行了总结分析，分别分析了在检测过程中反映出的保护层厚度控制问题。
[Abstract]:At present, the construction is becoming more and more standardized, but there are still many problems in the control of the thickness of the protective layer. Often, new construction projects have not been built or have just been put into use. As a result of the weak control of the protective layer, cracks appear and the structure is destroyed. The durability is seriously affected. In this paper, through engineering investigation, on-site inspection, patent research and development and literature review, the design, construction, detection and setting of cushion horse stool of the thickness of the protective layer of steel bar are studied. In this paper, a calculating method of checking the reliability of the thickness of protective layer is given, a set of self-made products of cushion horse stool is developed, and a construction guidance suggestion for setting and acceptance of cushion horse stool is provided, which can be used for wide design. Construction and management personnel provide a set of effective protective layer control methods. The specific research contents are summarized as follows: 1) combined with the research status of the thickness design of the protective layer at home and abroad, the role and requirements of the reinforced concrete cover are analyzed and summarized; 2) contrasting the domestic and foreign regulations about the thickness of protective layer, analyzing the problems of minimum thickness of protective layer in our country, and the gap between the minimum value of the thickness of protective layer and the corresponding specification of foreign countries; 3) combined with some existing models of carbonation and rust expansion cracking, the relationship between the thickness of the protective cover and the reliability is analyzed by the probability method when carbonation and rust expansion cracking are taken as the durability life standard. A method is provided for calculating the reliability of the thickness of the protective layer or checking whether the protective layer is adequate; 4) through the investigation of the actual engineering, the field inspection and the research on the current situation of the protective layer control, the paper analyzes and summarizes the design and construction of the protective layer control in the construction engineering practice. There are still problems in testing and bench setting. Based on this, a set of steel bar positioning products is designed and developed, and the economic and social benefits are evaluated, which solves the problems existing in the existing technology in the positioning process of negative reinforcement, stirrups, vertical reinforcement, etc. 5) in view of the fact that there is no detailed and standard construction instruction standard in the present setting of the cushion horse stool, combined with the local standards of Yunnan Province and the relevant foreign codes, the paper classifies the cushions and the horse stools of various materials, aiming at various components, The selection, setting distance, setting standard and acceptance standard of cushion and horse stool are proposed in detail, and the strength, stability and anti-slip ability of cushion horse stool are studied. Developed a partial patent to verify the performance of the cushion horse bench for the design and construction personnel to choose; 6) based on the field test, the principle, methods and some problems of the thickness detection of the protective layer of the steel bar position detector and the radar instrument are analyzed. The test data of engineering inspection and appraisal and the data of thickness detection and acceptance of protection layer of several engineering projects in Qingdao are summarized and analyzed, respectively, and the control problems of protective layer thickness reflected in the testing process are analyzed respectively.
【学位授予单位】：青岛理工大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU755

【参考文献】