2014年9月上 施工技术 第43卷第17期 CONSTRUCTION TECHNOLOGY 43 D0I:10.7672/sjs2014170043 电子雷管起爆错相减震试验研究 刘丽霞1,蒋玉波2,李进进1 2 (1.济南城建集团有限公司,山东济南250031;2.中国矿业大学力学与建筑工程学院,江苏徐州221116) [摘要]在雷管起爆错相减震原理的基础上,进行毫秒延期雷管和电子雷管起爆试验.通过对远近场地爆破引起 的振动监测,在距爆源>50m的位置,其衰减规律符合萨道夫斯基公式.电子雷管的错相减震效果明显,其震动明 显低于普通毫秒延期雷管,且在爆区中心30m以外的振速不足2.5cm/s 可有效避免爆破地震造成的危害. [关键词]电子雷管:错相;减震;试验;监测 [中图分类号]TU751.9;TD235.33 [文献标识码]A [文章编号]1002-8498(2014)17-0043-03 Experimental Study on the Shock Absorption by Phase Dislocation Using Electron-delay Detonator Liu Lixia' Jiang Yubo2 Li Jinjin'.2 (1.Ji'nan Urban Construction Group Ji'nan Shandong 250031 China;2.School of Mechanics Ciuil Engineering China Unirersity of Mining and Technology Xuzhou Jiangsu 221116 China) Abstract:The detonating experiment about millisecond delay detonator and electron-delay detonator was carried out on the basis of the principle of shock absorption by phase dislocation.Through the blasting vibration monitoring about the near and far field the attenuation rule of blasting shock accords with the Sadov's formula when the length is more than 50m from the explosion center.The decrease of shake is obvious by using electron-delay detonator.It is significantly lower than the mon millisecond delay detonator and the vibration velocity is less than 2.5em/s 30 meters outside of the explosion center which can effectively avoid the damage of blasting earthquake. Key words:electron-delay detonators;phase dislocation shock absorption;testing;monitoring 0引言 体通低滤高的特性,高频爆炸波衰减很快,...
2015年2月下 施工技术 第44卷第4期 CONSTRUCTION TECHNOLOGY 39 D0I:10.7672/5js2015040039 方木柱维修加固方法试验研究 刘琼,许清风,张富文,贡春成,陈溪 (上海市工程结构安全重点实验室,上海市建筑科学研究院(集团)有限公司,上海200032) [摘要]木柱加固方法多种多样,近些年以纤维布复合材料加固较为普遍,但是破坏木结构的形貌,而且难以拆卸. 笔者开发一种可逆的木柱加固方法,拟采用螺丝连接钢板或对穿螺栓连接钢板的方法加固方木柱,也设计了采用 粘贴钢板的方法,以对比几种不同的加固方法的效果.通过对比加固前后的方木柱试件的抗压性能可以看出,螺 丝连接钢板和对穿螺栓连接钢板加周木柱的方法未能明显提高木柱的承载力;模拟局部腐朽后采用同质顺纹木块 螺丝连接钢板应急维修的研究表明,在螺丝间距有保证时该方法可迅速恢复方木柱的承载能力和变形能力;粘贴 角钢并焊接缀条的方法能明显提高木柱的承载力和变形能力. [关键词]木柱:加固;螺丝;对穿螺栓;钢板 [中图分类号]TU746.3 [文献标识码]A [文章编号]1002-8498(2015)04-0039-06 Experimental Study on the Strengthening Methods for Square Wood Column Liu Qiong Xu Qingfeng Zhang Fuwen Gong Chuncheng Chen Xi (Shanghai Key Laboratory of Engineering Structure Safety Shanghai Research Institute of Building Sciences Group)Co.Lid.Shanghai 200032 China) Abstract:Among the variety of strengthening methods FRP is a mon method in recent years. However FRP is different in appearance with wood and is difficult to tear off so that it hazards the morphology of wood structure.In this paper a reversible method is suggested to strengthen the square wood column which is screw fixing steel plate or penetration bolt fixing steel plate method.In addition pasting steel plate or angle steel on the side surface is also designed to strengthen the wood column.The strengthening effect is analyzed by paring them with the original samples.By paring the pressive characters of the strengthening samples and non-strengthening ones it cannot be found that the strength is en...
[关键词]桩基础;桩端注浆;评价;敏感性分析;改进 【中图分类号】TU473.1 【文献标识码】A [文章编号]1002-8498(2015)10-0127-04 ApplicationofImprovedSensitivityAnalysisin Evaluation ofPile-end Grouting Xu Song,Xu Xuelian, Shao Quan,Xu Jun (Faculty ofEngineering,China University of Geosciences,Wuhan,Hubei 430074,China) Abstract:Aiming at the disadvantages of conventional sensitivity analysis in evaluation of pile-end grouting,eight factors which arebearing capability,pile length,pile diameter,aspect ratio,routing volume,grouting pressure,water-cement ratio andnumber of grout tubes,are optimized by cluster and principal ponent analysis,and four new and independent prehensive factors that are grout-end soil,pile size,grouting pressure andnumber of grout tubes areobtained.Then,massmeasured data are analyzed respectively by using the original factors and the optimized factors. The results show that the sequences of sensitivity are grout-end soil,grouting pressure, number of grout tubes and pile size. Meanwhile,theimprovedmethod has greatly mproved the accuracy and simplicity. Key words:piles;pile-end grouting;evaluation;sensitivity analysis;improvement 在钻孔(冲孔)灌注桩中,桩端后注浆技术能有差异性,导致评价结果误差较大,与工程实践不 效弥补灌注桩的承载缺陷,大幅提高单桩极限承载相吻合。
施工技术 2011年10月下 62 CONSTRUCTION TECHNOLOGY 第40卷第351期 改进型轻型井点降水技术及其应用 张建平,陈璐,黎伟锋,王付祥 (惠州市水电建筑工程有限公司,广东惠州516001) [摘要]传统轻型井点降水存在造孔成井慢、大功率大流量水泵无法适应、排水效果不理想、造井材料不能重复利 用、对原有水环境影响大等缺点.在传统轻型井点降水方法的基础上进行改性创新,采用小型化、轻型化设备和材 料,且可周转使用,处理后基坑内无渗流和明水,边坡稳定,降水影响范围也显著减小,保证了周边建筑的安全.与 传统轻型井点降水和拉森IV钢板桩支护相比,有良好的经济效益. [关键词]地下工程;降水;轻型井点 [中图分类号]TU753.1 [文献标识码]A [文章编号]1002-8498(2011)20-0062-03 Application of Dewatering Technology with Improved Light Well Points Zhang Jianping Chen Lu Li Weifeng Wang Fuxiang Huizhou Hydroelectric Construction Engineering Co.Ltd.Huizhou Guangdong 516001 China) Abstract:The dewatering technology of traditional light well points has some defects in hole and well forming pumps dewatering effect materials and large influence to environment.Based on the traditional light well points dewatering improved light well points are adopted.The improved dewatering technology adopts small and light equipments and materials and the materials can be reused.The foundation excavation has no seepage and water after treated with improved dewatering technology and the slop is safe.Moreover the influence range of dewatering is significantly reduced.Comparing with traditional light well points and IV steel-plate Larsen piles the improved light well points dewatering technology has better economical benefits. Key words:underground;dewatering;light well points 传统的轻型井点降水技术存在很多技术、经济1改进型轻型井点降水方法 方面的弊端:①造孔成井慢,主要是传统的管井成孔 改进型轻型井点降水是在传统的轻型井点降水 直径较大,在造孔成井时要用冲击钻或回转钻机,灵 方法的基础上进行改进创新,其创新点如下. 活性差,井壁构造较复杂,造价高,...
施工技术 2015年1月上 84 CONSTRUCTION TECHNOLOGY 第44卷第1期 D0I:10.7672/sgjs2015010084 干湿循环作用下高液限土抗剪性能试验研究* 方庆军’,崔猛2 (1.福建工程学院土木工程学院,福建福州350108;2,河海大学岩土工程科学研究院,江苏南京210098) [摘要]为研究高液限土在干湿循环作用下抗剪性能的变化规律,在实验室内通过使试样吸水后失水(或先失水后 吸水)来模拟现场干湿循环过程,并进行了大量的室内三轴压缩试验,从试验中发现:不论何种循环次序下,经过4 次干湿循环过后土样的内部结构基本趋于稳定.高液限土具有一定的胀缩性,在干湿循环作用下试样微裂纹的数 量有所增长且原有的微裂纹有扩展趋势. [关键词]地基;高液限土;干湿循环;抗剪强度;试验 [中图分类号]TU411.7[文献标识码]A [文章编号]1002-8498(2015)01-0084-05 Test and Study on Shear Behavior of High Liquid Limited Soil with Dry-wet Cycle Fang Qingjun3 Cui Meng㎡ (1.College of Civil Engineering Fujian University of Technology Fuzhou Fujian 350108 China; 2.Geotechnical Research Institute Hohai University Nanjing Jiangsu 210098 China) Abstract:For simulating the field wetting and drying cycle mass high liquid limited samples of triaxial test repeat through the process of absorbing water and dehydration or dehydration and absorbing water). Then the samples are put in the formal triaxial tests for studying the variation of shear behavior of high liquid limited soil during cyclic wetting and drying.From the result of the tests we can find that the internal structure of all soil samples tends to stability after 4 times wetting and drying cyclic on the two cycle order.From all tests it can be found that high liquid limited soil has swell-shrink characteristics the quantity of micro crack increased and the original crack extended in wetting and drying cycle. Key words:foundations;high liquid limited soil;drought-wet cycle;shear stren...
[关键词】混凝土;逆作法;转换层;自密实混凝土;模板 [中图分类号]TU375 【文献标识码】A [文章编号】1002-8498(2016)09-0060-03 ReverseConstructionMethodinConstructionofClosed BoxTypeTransferFloors Song Dongsheng',XiaoYun²,GaoXuanhuan',Shen Xiaoliang',Li Minggui? (1.CivilEngineeringfCollegeHainanUniesity,HaikouHainan570228China;2.AgileGroupZhongshan, Guangdong 528400,China;3.Third Consruction Enginering Company of Zhejiang Dongyang, Dongyang,Zhejiang 322100,China) Abstract;The closed box type transfer floor of tower building No.1 of a resort hotel in Lingshui county adopts reverse construction method,which effectively solves the problem of removing the interlayer framework support and shortens the construction period. Secondly in the construction process of dense reinforcement bars of large volume concrete beam,especially beams within a wide hole and below to vibration phenomenon, which uses high performance self-pacting concrete and embed a vibrator on the steel tube with supplementing by a small vibrator, it ensures the conversion girder construction integrity and quality. Key wordsconeretereverse construction method;transfering floors;self-pacting concrete;formwork 1工程概况 600mm;转换层墙、柱、梁混凝土强度等级为C55,顶 海南陵水某度假酒店工程位于海南清水湾A07板、楼梯为C30。
2014年9月下 施工技术 第43卷第18期 CONSTRUCTION TECHNOLOGY 119 D0I:10.7672/5j52014180119 对地下工程几种分部开挖方法的探讨* 牛富生,马亢2,付玉涛3 (1.同济大学地下建筑与工程系,上海200092;2.厦门大学土木工程系, 福建厦门361005;3.山东省第一地质矿产察院,山东济南250014) [摘要]介绍了几种分部开挖方法的主要特点,对其在软弱破碎围岩特殊地质条件下的实用性进行了对比,重点分 析了地表沉降要求对软弱破碎围岩隧道施工工法选择的影响,同时通过计算给出了各种分部开挖法施工受力解析 参数,从而结合现场施工经验提出一些有利的建议. [关键词]地下工程;分部开挖法;围岩;地表沉降;施工受力参数 [中图分类号]U455.4 [文献标识码]A [文章编号]1002-8498(2014)18-0119-05 Research on Several Partial Excavation Methods of Underground Engineering Niu Fusheng' Ma Kang2 Fu Yutao (1.Department of Geotechnical Engineering Tongji University Shanghai 200092 China; 2.Department of Civil Engineering Xiamen University Xiamen Fujian 361005 China; 3.No.I Institute of Geology and Mineral Resources of Shandong Prorince Ji'nan Shandong 250014 China) Abstract:Several key characteristics of partial excavation methods are introduced then the practicality of the excavation methods in weak and fractured rock are pared.The influence of the surface subsidence on tunnel construction methods is emphatically analyzed meanwhile the construction parameters of several partial excavation methods are given.Thus some favorable remendations are made bining on-site construction experience. Key words:underground;partial excavation methods;rock surface settlement;construction parameter 0引言 影响,同时通过计算给出了各种分部开挖法施工受 隧道分部开挖法尽管有许多缺点,如施工工序力解析参数,从而结合现场施工经验提出一些有利 多、进度慢、不利于采用大型施工机械和无轨运输、 的建议,以供隧道及地下建筑工程施工参考. 工程造价高等,但随着围岩分级的降低、隧道跨度 1几种分部开挖方法的特点 的增加,为确保隧道施工的安全与质量,分部开挖 隧道分部开挖方法种类繁多,现主要对以下4 的方法仍在铁...
[关键词]隧道工程;浅埋暗挖;降水;裂隙;渗透系数 [中图分类号】U455.4[文献标识码]A【文章编号】1002-8498(2016)01-0088-04 ResearchonShallowBuriedTunnelinWateryConsolidationClayLayer Liu Kuigang (Bejing MTRConstruction Administration Corporation,Bejing100068,China) Abstract:Ordinary well dewatering is usually used in Beijing when shallow tunnel by excavation. However, when it es to fractured water-rich consolidation of clay-like formations,owing to the existence of fissure in layer,verticalpermeability and horizontal permeability have huge difference,and ordinary well dewatering has small radius and can't form a funnel,resulting to the bad effect.In order to ensure the quality,safetyand construction efficiency of tunnel excavation inprimary support,measures like well-points dewatering on the ground bined with open-discharge inside the tunnel should be taken. Key words:tunnels;shallow tunnel by excavation;dewatering;cracks;permeability coefficient
0引言1工程概况 隧道洞室开挖时,地下水的存在会对软岩、土、1.1隧道结构形式及开挖方法 砂层造成不稳定和荷载增大,大量的地下水与高压隧道为单洞单线马蹄形断面,开挖断面面积约 水常会酿成洞内突水、突泥、突砂、地面沉降、地下为35.36m²,隧道单线长度557.8m,采用浅埋暗挖 水枯竭等重大事故。
2015年8月上 施工技术 第44卷第15期 CONSTRUCTION TECHNOLOGY 91 D0I:10.7672/8js2015150091 多阶循环卸载技术在屋盖施工中的应用 张元春,郭庆生 (中建一局钢结构工程有限公司,北京100161) [摘要]钢结构安装工程的卸载是一个动态过程,安装施工阶段的约束条件及荷载条件和使用阶段设计约束条件 及荷载条件差异较大,需做大量的空间受力计算.必须以体系转化为原则,以变形协调为核心,实时监控为保障, 建立必要的安全保障措施,才能保证钢结构安装卸载安全、可靠地进行.以某体育场为工程背景,对典型大悬挑钢 管桁架钢结构施工时所采用的钢管临时支撑系统进行分区多阶循环卸载模拟,同时介绍了屋盖受力体系转换过程 的施工工艺及技术措施. [关键词]钢结构;大悬臂;临时支撑:卸载:施工技术 [中图分类号]TU758.11 [文献标识码]A [文章编号]1002-8498(2015)15-0091-04 Application of Multi-order-cyclic Unloading Technology in Roof Construction Zhang Yuanchun Guo Qingsheng (China Construction First Dirision Steel Structure Engineering Co.Lid.Beijing 100161 China) Abstract:Unloading of steel structure is a dynamic process while differences with loading conditions and constraints between construction stage and using stage are large so engineers need to do a lot of spatial force caleulation.Engineers must follow the principle of system transformation which is based on the coordinate deformation as the core and securities are real-time monitored then set up necessary security measures all of these are in order to ensure the safety of steel structure installation and unloading.This paper takes a stadium project as example to simulate the temporary supporting system which is unloaded under the typical large-cantilever steel trusses by using method of multi-order-cyclic unloading during the steel structure construction.It also introduces conversion process of the construction technology and technical measures of this force system. K...
2014年11月上 施工技术 第43卷第21期 CONSTRUCTION TECHNOLOGY D0I:10.7672/5js2014210005 多支护形式共同作用下深基坑力学性能研究 杨辉,吕明1,叶金铋2,刘波,张笈玮1 (1.中国人民解放军63926部队,北京100192;2.重庆大学土木工程学院,重庆400045) [摘要]在开挖深度较大时,组合支护结构得到越来越多的应用,但设计中一般是将各种支护结构单独进行分析, 没有考虑共同作用.以某深基坑为例,通过FLAC建立有限差分模型,分析了土钉、顶撑以及排桩联合支护下深 基坑的稳定性,得到排桩水平位移、土钉轴力、支撑轴力的变化规律.研究结果表明:随着开挖的进行,支护结构受 力增大,但土钉变化不大;超载使桩身位移变大,地表沉降增大;过大或过小的排桩嵌固深度不利于受力;土钉的长 度应合理设置. [关键词]风洞;支护;有限元分析;土钉;桩;共同作用 [中图分类号]TU753.1 [文献标识码]A [文章编号]1002-8498(2014)21-0005-05 Research on the Mechanical Performance of Deep Foundation Excavation with Compound Supporting Structure Yang Hui' LǚMing' Ye Jinbi2 Liu Bo' Zhang Jiwei' (1.The 63926 Troop of Chinese People's Liberation Army Beijing 100192 China; 2.College of Ciril Engineering Chongqing University Chongqing 400045 China) Abstract:As a new kind of technology in deep foundation excavation the bined supporting structure is attracting more attentions.However research of the coupled effect is generally rare.Based on the software FLACSD the coupled effect of a deep foundation excavation with bined supporting structure is analyzed.The supporting structure is posed of soil nail top supports and row piles.The law of the horizontal displacement of piles the axial force of soil nail and the bracing axial force is obtained.The results show that force of the structure increases as the excavation depth increase but the axial force of soil nail is observed little variation.The overload would significantly increase the displacement of pile the su...
2017年7月下 施工技术 第46卷第14期 CONSTRUCTION TECHNOLOGY 49 D0I:10.7672/5js2017140049 多层模板支撑体系实测分析 曲成平,杨恒,邱伟 (青岛理工大学土木工程学院,山东青岛266033) [摘要]为了研究多层模板支撑体系荷载传递规律,探究多层模板支撑架在一个完整施工周期内的最不利荷载,对 青岛某工程模板支撑系统内若干楼层支架立杆轴力进行长期监测.通过对监测数据的统计分析,得出了支撑架立 杆轴力在一个周期内的变化规律,说明了支撑架立杆承担的最不利荷载出现在上一楼层顶板浇筑混凝土时,通过 定量分析给出了顶层施工荷载向各层楼板及支撑架的传递比例. [关键词]模板工程;支撑体系;混凝土;监测;分析 [中图分类号]TU755.2 [文献标识码]A [文章编号]1002-8498(2017)14-0049-05 Measurement Analysis of Multilayer Formwork Support System QU Chengping YANG Heng QIU Wei (School of Ciuil Engineering Qingdao Technological University Qingdao Shandong 266033 China) Abstract:In order to study the load transfer law of multilayer formwork supports system and explore the most unfavorable load of multilayer formwork support in a plete construction period we have long term monitoring of the shaft force of the support bar of a project in Qingdao.Through the statistical analysis of the monitoring data it is found that the variation of the axial force of the support frame in a cycle.It shows that the most unfavorable load of the support frame appeared in the upper storey roof pouring concrete.Through the quantitative analysis the transfer ratio of the top construction load to the floor and the support frame is presented. Key words:formworks;support system;concrete;monitoring;analysis 0引言 1工程概况 多层模板支撑体系是一个复杂又庞大的课题, 青岛海信创业中心项目位于青岛市山东路以 布置方法、形式随建筑结构变化而变化,与建筑结 东、如东路以南.该建筑地下4层,地上25层,裙房 构互相影响、互相作用,组成一个时变体系.作为 2层,主塔楼高96.4m 塔楼为框架核心筒结构,结 临时支撑结构,其组成构件多样复杂、节点形式多 构平面如图1所示. 变,存在很多不确定性.因此,多层模板支撑体系 ...
施工技术 2010年6月 64 CONSTRUCTION TECHNOLOGY 第39卷第6期 多基元模糊算法在工程估价中的应用 张利荣 (武警水电第二总队,江西南昌330096) [摘要]多基元算法把工程项目划分为多个可算基元,再应用模糊数学方法计算各个基元的价格,最后汇总得到估 算总价.基于多基元模糊算法的计算原理,建立数学模型进行分析计算,通过工程应用实例,比较多基元模糊算法 和单价法的估价结果.结果表明,多基元模糊算法具有适应性强、使用快、结果精确等特点,且与其他估价方法 能相容并结合使用. [关键词]工程估价;基元;模糊算法 [中图分类号]TU-922 [文献标识码]A[文章编号]1002-8498(2010)06-0064-03 Application of Multiple-base Elements Fuzzy Algorithm in Engineering Estimate Price Zhang Lirong (No.2 Hydropower Foree of Armed Police Nanchang Jiangxi 330096 China) Abstract:The engineering project is divided by the multiple-base elements fuzzy algorithm.Furthermore fuzzy mathematics is adopted to calculate the prices of every base element.As a result the total price is estimated by the sum.Based on calculation principles of multiple-base elements fuzzy algorithm taking the engineering application as example the estimation results are pared between multiple-base elements fuzzy algorithm and unit price algorithm.The results can show that there are some advantages of strong adaptability fast use and accurate result in multiple-base elements fuzzy algorithm.At the same time this algorithm can bine with other estimation algorithm. Key words:engineering estimate;base element;fuzzy algorithm 由于建设工程项目具有单件性、复杂性和周期长 2)实物量法是由工程项目所消耗人工、材料、机械 的特点,所以估价一般要经历投资估算、概算、预算到的费用和项目的管理费、利润所汇总的估价方法.实 合同价、结算价等多次计价过程,同时因工程、因时、物量法是针对每个具体工程项目计算的估价,是按实 因事、因人、因地等诸多因素不同而不同,如何快速准际的施工方案和方法进行估价,符合施工单位的真实 确地进行工程估价是一件十分重要而困难的工作,因水平,估算的结果一般比单价法更精确、合理.但要求 此工程估价的算法研究有较大的现实意义. 工程项目有齐全的施...
[关键词】地下工程;深基坑;支护;监测;施工技术 [中图分类号】TU753[文献标识码]A[文章编号]1002-8498(2014)01-0060-04 Application of Composite Retaining Structure in a Foundation Excavation Engineering Yan Xiaoxin',Huang Yanzheng'²,Chu Yuehua”,Li Zongming (1.SchlofCivilEngineeringandCommunication,NorthChinaUniverstyfWaterResourcesandElectricPower, Zhengzhou,He'nan450011,China; 2.China Construction Seventh Engineering Diuision Co.,Lad., Zhengzhou, He'nan 450004,China; 3. China Railway Fifth Survey and Design Institute Group Co.,Ltd., Zhengzhou Branch,Zhengzhou,He’nan 450011,China) Abstract:As foundation excavation isbeing more and more plicated,single supports form can't meet the requirement of safety, practicality and economy in foundation excavation construction. Composite retaining structure is more and more used in foundation excavation engineering. Based on engineering practice,according to the actual situation, corresponding support methods are adopted in different parts. Monitoring result shows that the setlement and displacement are under control, the posite retaining structure is successful. Key words;underground; deep foundation excavation; supports; monitoring; construction 近年来,我国国民经济高速发展,城市化进程1工程概况 不断加快,高层建筑不断涌现。
施工技术 2011年1月 88 CONSTRUCTION TECHNOLOGY 第40卷第2期 复合型聚羧酸外加剂在冬期施工应用中的试验研究 杨建国,王明明,李忠雨,娄维萍,马学伟 (天津市建工工程慈承包有限公司,天津300384) [摇]结含津广场一期E标段工程,在聚酸外加利冬期工中,恰当取试骑方法,考患不同混凝土配含比 对混凝土工作性的影响以不网养护条停对混凝土抗压度的影响.经过数据分析,优逸了聚粮酸的最佳接蛋, 并应用于工程中,取得了良好的经济数果.佳果明:复含型聚粮验外加剂不仅能提高混斑土的力学性能,而且能 提供简便易行的施王工艺. [关键词]混凝土工程:外加利:聚酸 [中图分类TU528.042 [立献识码]A [文章编号]10028498(2011)02-0088-03 Test Research on Compound Polycarboxylic Acid Admixture During Winter Construction Yang Jianguo Wang Mingming Li Zhongyu Lou Weiping Ma Xuewei (Tianjin Construction Engineering Main Construction Co.Lad.Tianjin 300384 China) Abstract:Based on the E bid section in one stage of Jinwan Square reasonable test method is selected during the winter construction of pound polycarboxylic acid admixture.Besides effects of different concrete mix proportions are studied on the concrete workability and effects of different maintenance conditions are researched on concrete pressive strength.The optimum mixing amount is chosen by analyzing data to be applied in the engineering.Good economic benefit is obtained.The results show that pound polycarboxylic acid admixture can not only enhance mechanical performanee of conerete but also offer the convenient construetion technology. Key words:concrete engineering:admixture:polycarboxylic acid 复含型聚羧酸外加剂是继木钙为代表的普通减还相对较少,应用时,很多是依据产品说明书或以往 水剂和以茶系为代表的高放减水剂之后发展起来的 经验进行操作,从而造成施工的言目性.特别是在 第三代高性能减水剂. 冬期施工期向,对聚粮酸外加对混凝土的单期强 复含型聚鞍酸外加剂不仅能提高混凝土的力学度的影响,仍然了解不足. 性能,而国能提供简便易行的施工工艺.它以极高 结含天津津湾广场一期工程E标毅工程,对聚 的减水率和极小的胡落度损...
2015年2月下 施工技术 第44卷第4期 CONSTRUCTION TECHNOLOGY 49 D0I:10.7672/5js2015040049 地下室屋顶花园柱破坏原因分析及加固方案 任生元,王建莹1,顾荣军2 (1.江苏鼎达建筑新技术有限公司,江苏常州213015; 2.常州市建筑科学研究院股份有限公司,江苏常州213015) [摘要]针对目前地下室屋顶花园建设中混凝土柱容易发生破坏的情况,分析了其破坏原因与破坏形态,介绍了混 凝土柱破坏后应遵循的加固处理程序,并对可行的加固处理方案进行了对比分析. [关键词]加固:混凝土;柱;破坏形态 [中图分类号]TU746.3 [文献标识码]A [文章编号]1002-8498(2015)04-0049-04 Causes Analysis and Reinforcement Schemes for Column Failure in Basement Roof Garden Ren Shengyuan' Wang Jianying' Gu Rongjun2 (1.Jiangsu Dingda New Construction Technology Co.Ltd.Changzhou Jiangsu 213015 China; 2.Changzhou Architectural Scientific Research Institute Co.Ltd.Changzhou Jiangsu 213015 China) Abstract:According to the current situation for the concrete columns of roof garden construction in the basement prone to damage this paper analyzed the failure causes and failure modes and introduced the reinforcement procedure after destruction of concrete column.The possible reinforcement schemes were pared and analyzed. Key words:reinforcement;concrete;columns;failure modes 随着城镇化进程的加快,物质生活水平的提高, 地下室屋顶花园一般覆土较厚且上面恒荷载 人们对现代城市生活环境品质的要求越来越高,如何较大,当地下室设计为地下停车场时,框架柱网间 以有限的土地资源满足城市绿地,进一步改善居住环 距一般较大,地下室顶层框架梁柱节点区域钢筋非 境,住宅小区地下室屋顶花园的建设正越来越得到重 常密集,上部有两侧贯穿节点的4层梁纵向钢筋和 视和发展.打造触物可及的绿色生态环境,这正好与 柱纵向锚固钢筋;下部梁纵向钢筋在节点的连接和 目前政府积极倡导建设生态文明城市相适应,对促进 锚固一般在设计上未做具体要求,现场施工传统做 新型城镇化的可持续发展具有重要意义.在建设住 法是:由于地下室框架梁下部纵向钢筋根数较多, 宅小区屋顶花园过程中,地下室钢筋混凝土柱及相邻 采用定尺长度9m的钢筋可能正好从两侧直接锚固 结构发生破坏时有发生,仅最近2年笔者就处理了十 在梁柱节点内,钢筋无需连接,也不产生接头费用, 几起地下室顶板建造屋顶花园导致地下室混凝土结 造成节点下部梁纵向钢筋实际根数是原设计的2 构破坏的工程案例.混凝土结构特...
施工技术 2015年8月下 114 CONSTRUCTION TECHNOLOGY 第44卷第16期 D0I:10.7672/sgj82015160114 地下室局部整体抗浮水头计算方法研究 杨淑娟,张同波2,刘德海 (1.青岛理工大学土木工程学院,山东青岛266033;2.青建集团股份公司,山东青岛266000) [摘要]对于带有大底盘地下室的高层、超高层结构,由于主楼部分结构自重较大,面地下室部分结构自重相对较 小,如果地下水位超过一定高度后,可能会导致与主楼的地下室部位出现“局部整体抗浮失效”.在施工过程中,当 地下室部位的覆土回填完成之前,结构的压重没有到位时,如果出现降水能力不足或遇到较强的降雨时,也会发生 施工过程中的“局部整体抗浮失效”事故.介绍了“局部整体抗浮失效”发生的部位及受力特征,并结合工程实例 提出了“局部整体抗浮设计水头”的计算方法,最后通过数值模拟验证了所建议计算方法的可靠性. [关键词]地下工程;地下室;抗浮水头;计算方法 [中图分类号]TU753.66 [文献标识码]A[文章编号]1002-8498(2015)16-0114-04 Research on Calculation Method of Local Anti-floating Water Head of Basements Yang Shujuan' Zhang Tongbo2 Liu Dehai' (1.School of Ciwil Engineering Qingdao Technological University Qingdao Shandong 266033 China; 2.Qingjian Building Group Co.Lid.Qingdao Shandong 266000 China) Abstract:With respect to high-rise and super-high-rise buildings with large chassis basements because of the high dead load of main building and the relatively low dead load of basement structure local anti- floating failure may occur when the groundwater rises up to a certain level of limitation.During the construction this phenomenon of local anti-floating failure may also happen when rainfall is not sufficient or it is too much before covering soil is backfilled and weight is not added.In this paper the location and mechanical property of the local anti-floating failure has been introduced.A calculation method of local anti-floating water head has been proposed and demonstrated a practical case.Finally the reliability of t...
施工技术 2016年5月下 30 CONSTRUCTION TECHNOLOGY 第45卷第10期 D0I:10.7672/8js2016100030 叠合柱新型梁柱节点力学性能与施工方法研究 羿生钻 (中铁城建集团北京工程有限公司,北京100024) [摘要]对钢管混凝土叠合柱梁柱节点进行了设计,将钢筋贯穿核心钢管,对其进行了单调加载和循环加载的有限 元模拟.并结合唐山某工程,对贯穿型节点设计方法进行了改进,尝试了弯起型节点.对两种节点的刚度、承载力 等性能进行了比较.研究结果表明:两种节点的整体滞回性能和承载力、刚度很相近,均具有良好的承载力、延性 及耗能能力.此外,还对叠合柱施工工艺进行了研究. [关键词]钢管混凝土叠合柱;力学性能;有限元分析(FEM);施工工艺 [中图分类号]TU31 [文献标识码]A [文章编号]1002-8498(2016)10-0030-03 Research on Mechanical Properties and Construction Method of New Laminated Steel Tube Columns Beam-column Joint Yi Shengzuan Beijing Engineering Company Limited of China Railway Urban Construction Group Beijing 100024 China) Abstract:A new laminated steel tube columns beam-column joint is designed steel bar will be throughout the core steel tube and monotonic loading and cyclic loading is simulated through finite element analysis.Combined with a project in Tangshan the throughout type node design method is improved and tried a bent-up type node.Two nods’bearing capacity rigidity and other performances are pared.The research results show that the two type node'hysteretic behavior bearing capacity and rigidity are nearly identical.High bearing capacity ductility and energy dissipation capacity are observed.In addition the construction method is studied. Key words:laminated steel tube columns;mechanical properties;finite element method FEM); construction method 钢管混凝土叠合柱是一种新型钢筋混凝土结 构抗震构件,它是由钢管混凝土外包钢筋混凝土而 成的柱,也可看成是在钢筋混凝土柱内置钢管混凝 土而成,如图1所示.钢管混凝土叠合柱-现浇钢筋 混凝土梁连接节点的可靠性对结构安全至关重要. 针对工程中的钢管混凝土叠合柱钢筋混凝...