The detection of concrete structure entity is the key to ensure the safety of structure in building construction. Compared with traditional detecting, the detecting instruments of concrete structure have made great progress. However, data collection and statistical analysis are still conducted manually, which causes low efficiency, heavy workload, and data error prone, etc. In order to solve the existing problems in concrete structure quality inspection, this paper develops an intelligent detecting system of concrete structure on the basis of Internet of things. The system makes full use of the Internet of Things, mobile terminals and cloud platform to realize automatic collection, processing and upload of floor thickness detection and reinforcement cover thickness detection, which effectively improves the work efficiency of the two detection contents. Moreover, enterprises can monitor the detection data of projects in real time, which ensures the timeliness, authenticity, and accuracy of the detection data.

在建筑工程施工中,混凝土强度实体检测是保证建筑结构安全的重点工作,其中回弹法因操作便利成为应用最广泛的混凝土强度检测方法之一.基于物联网的混凝土强度智慧检测系统将回弹法与数字化相结合,利用物联网设备有效提高混凝土强度检测工作效率,同时实现企业层级对所属工程混凝土强度检测数据的实时监控,保证混凝土强度检测数据的及时性、真实性、准确性.

北京环球影城停车楼清水饰面混凝土施工中,经反复论证优化,形成一套包含模板加固、混凝土色差控制、浇筑后结构养护等关键控制点的方案.对超大面积清水混凝土结构工程进行固化及严密的管控验收制度,可确保混凝土结构一次浇筑成型,观感达到饰面清水混凝土验收标准.

以深圳宝能中心超高层建筑施工为例,针对超高层建筑施工过程中主要存在的安全风险类别,介绍了相应的创新应急技术.经实际应用,应急技术体现了施工成本低、可周转使用或回收利用率高、绿色环保、安全可靠等特点,有效地保证了施工工期及施工安全,可为类似工程提供借鉴.

目前,我国风险管理的研究主要聚焦于对于风险因素的识别和评估,缺乏对于企业、项目管理水平的分析与评价.基于风险荷载和风险抗力的概念,从项目固有的风险因素以及企业、项目的管理措施和手段两方面进行分析.以深基坑桩锚支护体系为例,采用文献调研、专家访谈等方法,研究分析其施工过程,利用层次关系对该过程中风险源进行分类分级,从风险因素和管理措施两方面入手,通过逻辑关系建立深基坑施工过程中桩锚支护体系的风险荷载指标体系,并根据风险荷载指标体系识别出对应的风险抗力指标体系,为深基坑施工过程中的风险管理提供有效的辅助决策手段.

针对超高层施工平台在超高层建筑施工中的重要性和特殊性,以施工平台事故为顶事件,采用故障树分析法对超高层施工平台风险因素进行辨识和分析,表示出各事件之间的逻辑关系.结合模糊理论,引入模糊概率对基本事件的发生概率进行评价.计算出各基本事件和中间事件的模糊概率重要度,定量分析超高层建筑施工平台事故成因,寻找现场管理的重点.通过项目调研和专家访谈获取基本事件的模糊概率,分析发现施工平台的堆载问题和施工平台安、拆、顶升阶段的人员操作问题对于施工平台的安全事故影响较大,可为超高层建筑施工平台安全管理提供重要参考.

通过对补偿收缩混凝土的膨胀机理及抗裂分析的详细论述,从理论上寻求消除混凝土裂缝产生的可能性.介绍了与补偿收缩混凝土相适应的配筋构造、合理的浇筑方式和精心的施工养护等技术措施,以此保证超长结构在施工和使用期间都不会开裂.最后,通过对超长结构工程实例的抗裂计算,再次证明了无缝设计技术的可行性,为今后的超长结构设计施工提供了科学依据.

根据津门工程地下室结构尺寸与地质水文条件,采用三轴止水帷幕+护坡桩+3道水平撑的支护形式,全顺做方案。通过调整基坑内支撑设计,在其满足基坑支护要求的基础上,使其避让主楼结构投影范围内的地下室竖向结构;通过调整地下室结构施工工序,将整体地下室部分分成主楼结构投影范围内和非主楼投影范围内两部分,主楼投影范围内的地下室结构在内支撑不拆除的条件下组织施工;对内支撑横向穿越先行施工部分的施工节点进行深化设计,确保不影响结构施工同时不影响基坑支护安全;对先行施工部分与后续施工位置节点进行深化设计,确保施工质量。

通过对箱梁提升、运输、架设的施工工艺和方法进行研究,成功地编制了箱梁提升、运输、架设简洁、明晰的操作口令;通过对各独立作业班组按照"指挥-操作-监护-辅助"关系、各独立作业班组的同一层面岗位按部位进行统一编号、按口令操作,解决了箱梁提升过程的同步、次序问题,保证了起吊和落梁放置在支座上4支点高差不得大于2 mm要求,保证了在转移及装车过程中梁体3点受力且受力均匀的要求,保证了箱梁在提梁、移梁、转存、装车过程中不出现质量问题及重大安全事故。

工程承担的661榀箱梁全部为高性能混凝土,设计强度等级为C50,设计使用年限为100年,环境类别为碳化环境,作用等级为T1、T2。通过对原材料选用、配合比选定、混凝土的生产拌合、运输、泵送、浇筑、振捣和养护,直至预制梁合格出场,每一个环节都按客运专线及相关规范进行了严格控制与管理,保证了箱梁高性能混凝土的施工质量。

Beijing Shooting Range Hall serves the Beijing 2008 Olympic Games,which contains qualification competition halls,a final competition hall,a storehouse,a room for armed police use.The second floor of qualification competition halls take some prestress technologies of super-long prestress structure and one-way slab prestressed hollow board.The 700mm-thickness hollow board includes segment A with a length of 134 meters,and segment B with a length of 78.75 meters.By selecting suitable filling material and section type in prestressed hollow board,determining reasonable preset height of floor and setting anti-floating bars,the problems of high hollow ratio of 49.5%,and high anti-floating of 4.5kN/m,are solved.And the quality control target of no damaged concrete during presetting electromechanical suspender becomes reality.

Composed of several buildings,Beijing Shooting Range Hall Project is presently the biggest all-weather shooting competition hall that has the longest indoor space of sports buildings in China and the biggest outdoor field with astylar roof in Beijing.Its qualification competition hall is a half-closed and air-conditioned space that adopts the largest spanned one-way prestressed hollow floor slab in domestic similar structures presently.The technology of prestressed fair-faced concrete with cladding panel and that of intelligent glass curtain wall were first applied in this project successfully.Moreover,the application of butt connection of large spanned truss in the air,installation of thick prestressed hollow slab,floor radiant heating and air-conditioning in large space has ensured project quality and construction schedule,achieving good social effect.

In the construction of Beijing Huamaozhongxin office building,authors introduce the layout rules and design process of tower cranes.Then safety matters needing attention during tower cranes working are stated.