单侧墙体大钢模板施工技术应用

1 工程概况 该工程为集商场、餐饮娱乐、酒店、办公为一体的综合性公共建筑,总建筑面积为20.5万m2,轴网尺寸130.4×109.3m,地下4层,地上16层,占地面积16073m2.基础底板标高-20.57m,檐口高60m,为框架-剪力墙结构.地下4层层高4.5m,地下2、3层层高4.2m,地下1层层高5m,外墙厚500mm,C40P8,外墙支模面积约9 200m2,外墙模板采用单侧大钢模,选用专业厂家定做的86系列主龙骨模板.     

混合结构多层办公楼施工组织设计

一、工程概况某机关办公楼工程为混合结构,5～6层,建筑面积4842.4m~2,其中六层部分为1355.8m~2(伸缩缝以东部分)。工程的北外墙位于红线内1.2m,南端距招待所围墙9.5m.楼西侧有预留的食堂建筑用地长24m,东面是上道,东外墙离路边排水明沟2m。首层层高3.2m,2～6层层高3.0m,女儿墙800mm 高。±0=18.60m,室内外高差600mm,檐顶标如18.80m,建筑平面见图1。     

高层住宅现浇混凝土外墙外保温体系施工实践

中国人民解放军301干休所安居楼,地下2层,地上16层,现浇混凝土剪力墙结构,建筑面积19800M^2。采用复合外墙外保温体系,外保温表面积8900M^2,外墙厚200mm,保温板50mm厚,层高2.8m。外墙装饰为彩色弹性涂料,铝合金窗。     

现浇钢筋混凝土外墙施工

一、工程概况北京市浩庭花园二期工程1#楼高层住宅,地下2层,地上16层,现浇钢筋混凝土剪力墙结构,建筑面积26800m2,建筑节能设计采用复合外墙外保温体系,外保温表面积为11260m2、外墙厚180mm、保温板80厚、层高2.9m、外装饰为50×150面砖,断桥铝合金窗。     

外墙钢管脚手架质量控制

<正>南京某住宅小区工程由6幢住宅组成,主体结构为框剪结构体系。地下1层,地上11层,层高2.8m,总高度为30.8m,总建筑面积为72047m2。6幢外立面设计风格基本一致,凹凸拐角变化大,外挑阳台多,外墙脚手架     

地下室超高夕墙单面支模技术

北京中关村科贸大厦为全现浇框架-剪力墙结构,地下4层,地上22层,总建筑面积195 800m2.基槽采用护坡桩,靠护坡桩砌砖墙,采用内贴法地下防水.地下室从-4层向上层高分别为3.85m、3.4m、4.5m、5.1 m.外墙厚度分别为600mm、550mm、500mm、450mm.     

钢筋砼扁梁结构在多层综合建筑中的应用

1、工程概况: 位于长沙市贺龙体育馆西南角的泰古广场奥林匹克大厦,总建筑面积33141.8m~2。地下二层,地上五层,地面高度为21.3m。其中地下一层为车库,地下二层为旱冰场及设备用房;地上一层至五层均为大开间商场及办公用房。层高由3.6m至4.5m不等。采用钢筋砼结构,下部(地下二层至地上三层)为普通框架结构,上部(地上四层至屋面)采用扁梁——平板体系。平面尺寸79.6m×79.6m,柱距8.4m×8.4m。外悬挑尺寸由1.5m至3.3m不等。 2、结构方案的选定: 本工程地下二层至地上三层层高由3.9m至4.5m不     

无塔吊变形缝墙体模板施工

安德大厦工程总建筑面积61 336m2,地下3层,地上20层,建筑总高度74m,层高4·5、3·9、3·2m,为全现浇钢筋混凝土框架剪力墙结构,是集办公、会议、餐饮、住宿、娱乐于一体的豪华五星级酒店。该工程北侧距现有的洲际大厦外墙仅350mm,设置有2道12m长的剪力墙。受场地条件限制,现场只能安装2台30m臂长的塔吊,其中一台为内爬式。尽管如此,北侧变形缝墙体和柱仍不能被塔吊覆盖,该部位墙体模板施工遇到了新问题。1施工难度变形缝位于1~11层,层高3·2m,缝宽350mm,长11·4m,工人无法进入操作。塔吊大臂最远端距变形缝15m,所有施工只能靠人工搬运(见图1…     

黄州商城火灾后加固设计方案

黄州商城地下1层，地上10层，其中裙房2层。地下一层层高5．0m，地上一层层高5．0m，二层层高6．0m，标准层层高3．6m(图1)。     

轻型全钢大模板在清水混凝土中的应用

徐州锦绣嘉园5、6号两栋高层住宅,地下2层,地上33层,层高2.9m,建筑总高度102m,分别设置3部电梯、1部楼梯,全剪力墙结构,±0.000以上外墙厚250mm,内墙厚200mm,楼面为厚100mm现浇板,总建筑面积60000m2.要求混凝土为清水混凝土.     

Critical Factors in Financing and Management of Light Rail Transit Systems： Delphi Methodology Approach

In recent years, a large number of LRT （light rail transit） networks and tramways have been built in Spain using the tender system. The rhythm of construction has been such that very few analyses have been carried out and those that have were only partially done because the main participants involved had ulterior motives which impeded their having a critical and independent opinion of the projects carried out. Within this framework, the Delphi methodology presents itself as a very useful instrument, as the intrinsic advantages that it has added to the characteristic that the experts who participate in the project can remain anonymous without detracting value from the conclusions obtained as these are grouped together according to their worth.     

厂房预制预应力檩条断落事故原因分析与处理

某新建牛仔布厂由织布车间、浆染车间、锅炉房、配电房、仓库及办公生活用房组成,所有屋盖均采用预制三角形混凝土屋架、预应力混凝土檩条、椽子和平瓦屋面结构。由专业单位设计,外购专业厂家生产的预制屋架、预应力檩条,由业主自行组织施工和构件安装,该厂房于2002年建成投产后未检查保养,2009年9月12日夜间,在正常生产的浆染车间纱缸屋盖处,发生一根预应力檩条突然折断掉落到浆染纱缸内,造成一缸纱损失。整条单机流水线停机的事故。     

Unanticipated Bond Failure over Supporting Band Beams in Grouted Post-Tensioned Slab Tendons with Little or No Initial Prestress

After grouting the ducts in a large band beam and one-way slab post-tensioned floor system in a large shopping mall （in excess of 1.5 km2 in plan）, doubts arose concerning the level of initial prestress and the strength and serviceability of the slabs was questioned. To assess the strength of the slabs, it was assumed, as a worst case scenario, that some spans may have been constructed with zero initial prestress. Load tests on prototype specimens, with similar dimensions and reinforcement quantities as the floor slabs, were performed to assess the stress development in initially unstressed, but fully grouted, tendons. Unexpected bond failures occurred at the junctions of slab and band beam where the abrupt change in section depth caused a sudden change in tendon stress. The maximum stress that was developed in the initially unstressed tendons at these locations was about 60% of the strength of the tendons.     

Infilled Reinforced Concrete Beams for Sustainable Construction

This paper presents a study carried out on infilled reinforced concrete beams for sustainable construction. In reinforced concrete beams, less stressed concrete below neutral axis can be replaced by some light weight material to reduce the weight of the structure and also achieve the economy. The used infilled material is brick. Sustainability can be achieved by replacing the partially used concrete. By saving concrete, the authors save cement, which reduces the green house gases emissions. So it is considered as environment friendly. Since infilled beam acts like a layered member, there needs a theory to analyze it. Method of initial functions is used for the analysis of the infilled RC （reinforced concrete） beams. This method is successfully applied on infilled beam. Results show that physical conditions are verified for infilled beam.     

Flexible Pavement Design Simulation Using Mechanistic-Empirical Pavement Design Guide

The KDOT （Kansas Department of Transportation） is currently adopting MEPDG （mechanistic-empirical pavement design guide） to replace the 1993 AASHTO （American Association of State Highway and Transportation Officials） design method. The main objective of this study was to compare flexible pavement design using 1993 AASHTO design guide and MEPDG. Five newly built Superior PERforming Asphalt PAVEments （Superpave）, designed using the 1993 AASHTO Design Guide, were selected as test sections for the design simulation study. Deflection data were collected approximately 8 to 10 weeks after construction using FWD （falling weight deflectometer）. The FWD deflection data were used to back-calculate the pavement layer moduli using three different back-calculation programs. The existing pavement structures were analyzed for a 10-year analysis period. The maximum numbers of years the existing pavement structures will be in a serviceable condition as well as the minimum thicknesses of different layers to serve for 10-years were also determined. Effects of changing subgrade modulus, target distress, and reliability were also investigated. The MEPDG design analysis shows that the 1993 AASHTO Guide-designed flexible pavements do not show the distresses currently observed in Kansas for the 10-year design period. The MEPDG design simulation shows that the thinner the pavement sections, the higher the permanent deformation. The existing pavement structures can serve for more than 20 years as per the MEPDG design analysis if the default failure criteria and nationally-calibrated models are used.     

Economy of RHA （Rice Husk Ash） in Concrete for Low-Cost Housing Delivery in Nigeria

Delivery of housing units in adequate quantity and quality has been the pursuits of individuals and successive governments in Nigeria. Still, the gap between demand and supply is becoming wider on daily basis due to exorbitant cost of building materials that is beyond the reach of average Nigerians. Concrete being the most acceptable construction material is expensive due to high cost of cement. Efforts made to reduce the cost of cement were to no avail, thus there is need to look elsewhere. Past researches showed that substituting cement with 15% of RHA （rice husk ash） in concrete improves the performance of concrete and reduces global warming as a result of emissions from cement production. This paper looks into the effect of using RHA as partial substitute of cement on the cost of a low-cost housing unit. Results showed that cement based construction materials are responsible for 82.58% of the total cost in which cement is responsible for 42%. When 15% RHA was used to substitute cement over N90,000 was saved, amounting to about 7% of the total cost of the building. In addition, depletion of natural resources was reduced.     

Bending Stresses of Steel Web Tapered Tee Section Cantilevers

Although commonly used, no design method is available for steel web tapered tee section cantilevers. This paper investigates the bending stresses of such beams. Relationships between the maximum compressive stress and the degree of taper were investigated. An analytical model is presented to determine the location of the maximum stress when subjected to a uniformly distributed load or a point load at the free end and was validated using finite element analysis and physical tests. It was found that the maximum stress always occurs at the support when subjected to a uniformly distributed load. When subjected to a point load at the free end and the degree of taper is up to seven, it was found that Miller＇s equation could be used to determine the location of the maximum stress. However, it is shown that when the degree of taper is greater than seven, Miller＇s equation does not accurately predict the location and the analytical model should be used. It was also found that the location of the maximum stress was solely dependent on the degree of taper, while a geometric ratio, fl was required to determine the magnitude of the maximum stress. A simple method that predicts the magnitude of the maximum stress is proposed. The average error in the prediction of the magnitude of the maximum stress is found to be less than 1.0%.     

Probabilistic Seismic Hazard Assessment for Bridgetown-Barbados,Employing Subduction Interface Characteristic Earthquakes

A new probabilistic seismic hazard analysis was performed for the city of Bridgetown, Barbados, West Indies. Hazard computations have been performed using the standard Cornell-McGuire approach based on the definition of appropriate seismogenic sources and expected maximum magnitudes, the authors take into consideration the possibility of large subduction interface earthquakes of magnitude 8.0-9.0 beneath the Barbados accretionary prism via application of a characteristic model and slip rates. The analysis has been conducted using a standard logic-tree approach. Uniform hazard spectra have been calculated for the 5% of critical damping and the horizontal component of ground motion for rock site conditions setting 5 return periods （95, 475, 975, 2,475 and 4,975 years） and spectral accelerations for 34 structural periods ranging from 0 to 3 s. The disaggregation results suggest that the magnitude-distance pair that dominates the hazard yields M 7.4 and 8.6 and a distance of 42.5 km in the Interface Subduction Zone beneath Barbados for the 475 and 975 years RP （return period）, respectively. An event with an M 8.0 at a distance of 107.5 km in the Intraplate Subduction Zone is the second scenario that dominates the hazard for both 475 and 975 years RP.     

Sustainable Methods and Techniques in Old and New Public Constructions

This article is about the methods and techniques used in the building ＂retrofit＂ in modernist style designed by the architect Affonso Eduardo Reidy in the fifties, and also about the project of the new Rio de Janeiro MIS （Museum of Image and Sound）, under construction, by The North-American office Diller Scofidio ＋ Renfro, both located in the city of Rio de Janeiro. These constructions present a wide view of the concept of sustainability, not commonly used in public buildings in Brazil. In the building designed by Reidy, which belongs to the State of Rio de Janeiro, the regeneration to host the new headquarters of the State Department of Taxation and Finance respected its original characteristics and used smart and sustainable design techniques, as well as recyclable materials. On the other hand, the project of the new museum at Copacabana Beach was entirely planned on sustainable bases and it includes the application of building techniques concerning that purpose. This article presents a study of these two cases and evaluates the techniques and materials used in one another. Observing the principles of sustainability in construction is a pioneering initiative of the State Government. This article aims at making the scientific community aware of the needs of immediate adoption of sustainability techniques in Civil Engineering, not only in the construction of new buildings, but also in the regeneration of the existing ones, as well as the need of imperious adoption of sustainable techniques when it comes to maintainability.     

Use of Geophysical Techniques for the Localization of the Restricting Zones of Permeability in the Bottom of Basin： Forecasting the Zones of Clogging

Measurements of dielectric parameters followed by permeability tests are performed on soil samples of infiltration basin. The dielectric parameters are obtained by TDR （time domain reflectrometry） measurements from which it is found that the measurement of the permittivity, the electrical conductivity and the relaxation time of compacted soil allows the mapping of the values of the coefficient of permeability at the surface of an infiltration basin. With the distribution of the coefficient of permeability, the areas of water stagnation can be detected before the basin filling. The study proves that the TDR measurements for the detection of these zones can be used for the management of infiltration basins for sustainable working and their remediation can be undertaken before the rainy seasons.