型钢炼铁厂2×1880m~3高炉图拉法烟囱加固技术

主要就型钢炼铁厂2×1880m3高炉图拉法烟囱加固方案的选择,加固工程的组织施工及施工过程中采取的安全技术及措施,以及加固后的重新防腐等施工技术做了详细介绍。     

强夯法在粉砂土地基施工中的应用

文章结合达旗伊泽工程项目,介绍了强夯法在适宜含水量粉砂土地基施工中的应用,并对强夯施工的加固原理、施工工序、技术要求及投入的主要机械设备进行说明,检测结果表明加固效果达到设计要求.     

铧厂沟金矿北区盲竖井井筒破裂加固工程实践

以铧厂沟金矿5#盲竖井为工程背景,分析得出围岩破碎、地下水浸蚀、附近采场爆破震动是5#盲竖井井壁破裂的主要原因;在分析其破坏机理的基础上,对开裂变形段井壁采用了喷锚支护、井圈槽钢及注浆加固综合治理方案。详细介绍了综合治理方案的参数设计及井壁加固施工过程。在破裂井壁注浆加固施工中及加固施工完成后,井壁变形观测结果表明,井壁变形得到有效控制,加固段未出现新的裂缝,加固工程取得了较好的应用效果。     

某纺织厂工程事故分析及结构加固

简要介绍了某纺织厂厂房的设计失误，分析了失误中的主要问题，并针对厂房的具体情况，采用适当的加固措施，探讨了加固施工的具体方法。     

碳纤维加固混凝土框架梁施工原理及技术讨论

碳纤维是一种新型结构加固材料.文章通过受损框架梁的修复,介绍了碳纤维加固的设计及施工原理.实践证明碳纤维加固技术施工简便、加固效果良好,值得在加固工程中广泛推广使用.     

岩土工程施工中基坑边坡失稳及加固处理技术研究

由于环境、施工准备不足以及施工管理等因素的影响,导致岩土工程的基坑边坡失稳,本文结合项目施工现状,详细分析了传统HDPE防渗膜加固技术、抗滑桩支护技术、复合型加固技术以及排水加固技术等应用,并提出基坑边坡失稳的加固方案。从地质稳定性、加固设计合理性、施工组织等方面,为进一步提高岩土工程施工质量提供参考。     

矿山滑坡地质灾害治理工程施工探讨

矿山滑坡与地质条件、地下水、施工扰动、边坡加固施工方案和施工质量等因素密切相关,矿山滑坡会引发安全生产事故、干扰矿山开采作业活动、破坏矿山开采作业面。矿山开采单位需采取有效的技术措施和施工方案强化矿山边坡的稳定性,主要的策略是对边坡实施加固处理,同时治理可引发边坡滑坡的地质灾害,具体措施包括清除边坡中的破碎岩带、设置防滑桩和排水沟等设施。     

包钢宽厚板沉井施工总结

主要介绍包钢宽厚板沉井施工中的工程降水、模板加固和脚手架的工作方法.沉井在施工期间能否顺利下沉,在制作施工时是否安全可靠,借助于对关键点的计算,从理论数据上为施工方案的确定提供了参考依据.     

外包钢加固混凝土排架柱及增设型钢牛腿分析

介绍了混凝土柱常用加固方法,结合具体工程分析了外包钢加固柱的设计、施工及增设型钢牛腿的设计、施工     

高强度灌浆料加固钢筋混凝土结构施工

高强度水泥基灌浆料加固钢筋混凝土,施工简便、成本较低、质量可靠。通过工程实例,介绍高强度灌浆料加固钢筋砼结构施工技术方法。     

Stay-in-Place Fiber Reinforced Polymer Forms for Precast Modular Bridge Pier System

This paper presents an innovative modular construction of bridge pier system with stay-in-place fiber reinforced polymer (FRP) forms filled with concrete. Two 1/6 scale precast modular frames were prepared of a prototype bridge pier system. Three different types of connections were considered: male-female, dowel reinforced with or without tube embedment, and posttensioned. The frames were load tested in negative and positive bending. Subsequently, the cap beams were cut from the frames and tested to failure in four-point bending. Posttensioned joints exhibited the most robust and ductile behavior and proved to be the preferred method of joining stay-in-place forms. Even with dowel bars, the male-female joints lacked the necessary structural integrity in the pier frames. Better surface preparation for FRP units and higher quality grouting may improve the response. Embedment of the columns into the footing provided additional stiffness for the connection. The study indicated that internal reinforcement is not necessary for the stay-in-place forms outside the connection zone. The experiments also showed the importance of maintaining appropriate tolerances and match casting for male-female and embedment connections. Overall, however, feasibility of the precast modular FRP system was demonstrated in this study.     

抗震区框架梁柱施工中钢筋分项工程质量控制

从钢筋的材质、钢筋的搭接位置、箍筋加密区的安装、梁柱节点钢筋施工、变截面处柱钢筋的锚固等方面论述抗震设防区框架梁柱施工中钢筋分项工程的质量控制。     

Constructability and Economics of FRP Reinforcement Cages for Concrete Beams

This paper presents a quantitative economic analysis and a qualitative constructability analysis of three-dimensional fiber-reinforced plastic (FRP) reinforcement cages for concrete beams. Material, labor, and life-cycle costs are provided, and construction practice aspects are discussed. The results of the analyses indicate that prefabricated FRP cages can offer benefits to the construction industry. Although the initial costs of the FRP materials are likely to be higher than those of steel rebar, there is a significant potential for cost savings due to reduced maintenance and labor costs, as a result of the corrosion resistance of the FRP and the increased construction productivity. When direct life-cycle costs are considered, FRP reinforcements already constitute, in many cases, an economically competitive alternative to conventional steel reinforcement in adverse environments. If, in addition, the indirect cost savings as well as quality and safety issues are considered, the FRP reinforcement may be even more competitive.     

预应力锚索在边坡工程中的应用

预应力锚索作为高危边坡加固的一种有效措施，在各种边坡工程建设中得到了广泛的应用。本文首先阐述了道路工程高路堑边坡预应力锚索施工的工艺特点、施工工艺及施工要点，提出了常见问题的处理措施。基于锚索预应力损失问题是关系到锚固工程安全与否的重要因素，随后对预应力锚索加固边坡的机理、锚索预应力损失的影响因素及其应对方法进行了探讨，提出了应力补偿的措施。     

Economic Evaluation of Reinforced Concrete Structures with Columns Reinforced with Prefabricated Cage System

A new reinforcement system termed the prefabricated cage system (PCS) that can be used as an alternative to the rebar reinforcement cage is economically evaluated. PCS is a prefabricated reinforcement that enables easier, faster, and more reliable construction. Use of PCS shortens the construction schedule time and lowers total construction cost. This is important to both owners and construction contractors. The engineering economics methods presented in this paper would also be of interest to researchers. Reinforced concrete structures with PCS reinforced columns have been considered in this research, as it is one of the major applications of PCS. Various parameters affecting the economics of PCS are reviewed and a case study structure is analyzed comparing the costs of the structure with rebar reinforced columns to costs of the structure with PCS reinforced columns. The investigation shows that using PCS results in a 33.3% time savings and a 7.1% cost savings over rebar for each column. This results in an average of 3.6% savings on total project cost; an average of 22.2% savings on total column costs; 20.4% savings on total project time period, and 33.3% savings on columns construction time period. The cost savings are estimated based on production of small quantities of PCS reinforcement. Mass production of PCS reinforcement would result in even higher cost savings.     

甲玛铜多金属矿4261平硐注浆堵水加固工程实践

开拓工程是矿山建设的重要组成部分,其施工速度与质量直接影响整个矿山建设进度及使用。以甲玛铜多金属矿二期工程4261平硐掘进为工程背景,分析了平硐突水的主要原因,提出了平硐突水段及构造破碎围岩段采用的注浆堵水加固综合治理方案;详细介绍了注浆堵水和巷道掘砌加固施工过程。工程应用实践表明,综合治理有效地封堵了出水通道,恢复了正常掘砌工作,收到了预期效果。     

冶金建筑混凝土构件中钢筋锈蚀的产生及防治

冶金企业生产环境复杂 ,腐蚀因素多 ,钢筋锈蚀带来的如使用寿命缩短、维修费用高等是建筑管理中的常见问题。本文从锈蚀机理分析入手 ,探讨了其影响因素及防治措施     

Production and use of class B500S reinforcing steel (diameter 6–12 mm)

The production and use of cold-deformed steel reinforcement of class B500S is considered. The use of cold-deformed reinforcement in construction is hindered by the considerable number of state standards and technical specifications that exist. Some of the technical specifications are inconsistent with class B500S.