模壳工艺在密肋楼板中的应用

本文对聚丙烯塑料模壳在大空间、大跨度结构模板支设体系中的应用提出见解 ,并结合包头市华银商贸大厦成功的模板支设方案建立了Φ4 8× 3 .5mm钢脚手管、连接角模等通用机具在模壳支撑体系中的应用方法 ,拓展了模壳施工工艺的适用空间     

钢筋砼筒仓圆锥形漏斗支模工艺及施工方法

介绍钢筋砼筒仓圆锥形漏斗支模工艺及施工方法,主要介绍支撑体系。上表面内模板活式拼装施工方法。     

喷射混凝土施工技术

采用普通支模浇筑70 mm混凝土板墙的施工方法难以满足业主对工期的要求,且浇筑困难不容易保证质量,采用喷射混凝土工艺减少了施工工序,加快施工进度,取得了较好的效果,积累了宝贵的施工经验。     

剪力墙大钢模施工中的门洞侧模板加固技术

在某工程施工中,针对剪力墙门洞尺寸较大、数量较多给施工带来的问题,对剪力墙侧模板的加固方式进行了改进.通过对支撑方案进行优化设计,解决了传统支模方式导致模板位移、变形及炸模的问题,保证了剪力墙的垂直度和平整度.结合该工程实例,介绍了剪力墙大门洞侧模的加固技术.     

可塑料在轨梁厂步进式加热炉施工中的应用

介绍了包钢轨梁厂步进式加热炉砌筑中耐火可塑料从施工准备、模具制作及支设、可塑料捣固、拆模、砖底及孔洞修整到膨胀缝的开设等全过程的一些施工方法及注意的问题，可对今后可塑料的施工起到一定的借鉴作用。     

轻钢 - 轻质混凝土结构在看台台阶中的应用

轻钢主要指轻型冷弯薄壁型钢、轻型焊接和高频焊接型钢、薄壁钢板、薄壁钢管、轻型热轧型钢及以上各型材的组合,其具有强度高和自重轻的特点,能充分发挥其材料特性并带来施工便利的建筑材料。轻钢 -轻质混凝土结构具有结构自重轻、抗震性能好、施工速度快、劳动强度低等优点,目前行业内常见的轻钢墙体有空心墙体和实心墙体两种,空心墙体常采用 OSB 板 ( 欧松板）或水泥板加保温隔音棉,实心墙体多采用现浇轻质混凝土。实心墙体为代表的轻钢 - 轻质混凝土结构,为了便于后期自密实轻质混凝土灌浆施工,在轻钢结构龙骨架安装完成后,需要在墙体两面挂上免拆模板钢丝网,将事先按设计密度搅拌好的轻质混凝土进行墙体浇筑。银川市三沙源防沙治沙学院体育看台工程中,台阶就采用轻钢 - 轻质混凝土结构,与传统的混凝土结构相比,降低了看台板的厚度和配筋率,由于自重减小而基础尺寸也相应减小,项目实施后效果良好。     

谈预制预应力空心桥板的施工监理质量控制

论述了预应力钢筋混凝土预制空心桥板支模、拆模和钢筋、预应力钢绞线等监理工作要点，以利于提高监理工作质量。     

国内首件T异型锌电解槽

日前，中国十五冶三公司在广东丹霞冶炼厂项目中生产出国内第一件T异型锌电解槽产品，实现了锌电解槽预制的初战告捷。该产品由意大利设计院设计，引进加拿大技术，将电解槽整体分两片预制后合成一个槽，模板由端模、侧模、底模拼装组成，单体重40t。     

大模板施工中飘窗板浇筑方法改造探讨

由于现阶段大模板工程施工中对不同标高结构施工采取二次浇筑的方法,既不经济,又存在质量隐患。本文以飘窗板施工为例,通过模板改造从而改变施工方法的角度,从技术质量、经济、施工进度等方面对新旧方法进行了对比讨论。     

济宁任兴商务中心工程高大空间结构施工技术

随着我国建筑设计、施工水平的不断提高,高大空间结构越来越多,其施工难度、危险性也随之增加.针对济宁任兴商务中心工程结构形式复杂、含有大量高大空间、施工难度大的特点,对高大空间结构的项板、梁模板支撑体系、超高独立柱模板、高空钢结构施工的方案设计以及现场实施、质量控制情况进行探讨.     

Nonshored Formwork System for Top-Down Construction

Recently, the top-down construction method has been applied to building construction to secure excavation safety by providing rigid diaphragm walls. Usually, proper and economical formwork systems need to be selected for successful top-down construction. This paper proposes a nonshored top-down formwork system (referred to as NSTD) as a modified formwork system for top-down construction. The NSTD method provides sufficient workspace for excavating under the suspended forms. Upon completion of concrete placement and curing on the ground level slab, the formwork system is lowered to the next floor, and the process is repeated down to the lowest underground floor. The advantages of the NSTD method include a reduction in the excavation duration and an improvement in the quality of the underground concrete work by the hanging-type formwork. A case study was performed to verify the validity of the NSTD by comparing its schedule and cost effectiveness with those of traditional top-down methods.     

Contemporary Trends in Formwork Standards—A Case Study

One expression of the renewed attention gained recently by formwork for concrete is the current revision of formwork standards. This paper presents the new Israeli formwork standard as a case study for contemporary trends in formwork standardization. The main novelty in the new standard is its similar treatment of the design of temporary structures to that of permanent structures, resulting in the replacement of the traditional allowable-stress approach with the concept of limit-state design and partial safety factors. The paper presents this concept and discusses its applicability to formwork design. In addition, the paper highlights several other issues of a contemporary nature, which appear to be worth debate by standardization committee members from the industry and academia. In the course of the preparation of the new Israeli standard, American, European, and Australian standards and similar documents were closely studied; some comparisons of design and loading data that may affect construction safety and economy are also presented in this paper.     

Multilevel Formwork Load Distribution with Posttensioned Slabs

Formwork and the associated shoring represent a significant proportion of the costs associated with the construction of multilevel concrete structures. To minimize these costs, a limited number of formwork and shoring sets are recycled up the structure as construction progresses, eliminating the need for a new set of formwork and shoring with each new slab. When a slab is posttensioned using draped tendons, slab lift occurs as a portion of the slab self-weight is balanced. The formwork and shores supporting that slab are unloaded by an amount equivalent to the load balanced by the posttensioning. This produces a load distribution through the structure that is inherently different from that of a conventionally reinforced slab. This paper presents two design methods suitable for modeling the multilevel formwork process for posttensioned slabs: A modification to the simplified analysis method and a finite element model—both techniques will be of immediate use by industry practitioners and of interest to researchers examining the load distribution phenomenon. The paper also summarizes the findings of one of only a few research projects in which actual shore loads were monitored during the construction of a multilevel posttensioned building, which is used to validate the proposed design models.     

简介钢大模清水砼在工程应用中的质量控制

根据钢大模清水砼在某高层住宅工程的施工情况，简单介绍钢大模清水砼施工的质量控制措施。     

Seismic Behavior of High-Strength Concrete Columns Confined by Fiber-Reinforced Polymer Tubes

The use of high-strength concrete (HSC) in seismically active regions poses a major concern because of the brittle nature of material. The confinement requirements for HSC columns may be prohibitively stringent when ordinary grade transverse steel reinforcement is used. An alternative to conventional confinement reinforcement is the use of fiber-reinforced polymer (FRP) tubes in the form of stay-in-place formwork which can fulfill multiple functions of: (1) formwork; (2) confinement reinforcement; and (3) protective shell against corrosion, weathering and chemical attacks. The use of stay-in-place FRP formwork is investigated as concrete confinement reinforcement for HSC and normal strength concrete (NSC) columns with circular cross sections. Large-scale specimens with 270?mm circular cross-sections and different concrete strengths were tested under constant axial compression and incrementally increasing lateral deformation reversals. FRP tubes were manufactured from carbon fiber sheets and epoxy resin. The results indicate that inelastic deformability of HSC and NSC columns can be improved significantly by using FRP tubes, beyond the performance level usually expected of comparable columns confined with conventional steel reinforcement.     

Comparative Analysis of Shoring Towers for High-Clearance Construction

Formwork for cast-in-place concrete in high-clearance construction is commonly based on multitier shoring towers. The market has responded to the demand for shoring towers by offering numerous proprietary models, from which the constructor can choose. Thus, there is a need for comparative data and selection criteria that are comprehensive, objective, uniformly processed, and systematically organized. This paper presents methodology, formatted data, and findings that purport to assist constructors in rationally selecting the appropriate shoring towers for their projects. For the benefit of industry practitioners, the paper offers an overview of tower configuration and classification, a formatted list of selection criteria generated on the basis of input from formwork manufacturers, and interviews with representatives of formwork service companies, examples of comparative data on selected tower models, and quantitative comparisons based on the introduction of normalized parameters and on formwork solutions for typical cases. This information is particularly vital given the high cost of tower-based formwork relative to the overall construction cost of the supported concrete element, while published erection and dismantling work input data are largely still unavailable for most models and heights of shoring towers.     

Formwork Design

The American Concrete Institute's methodology for designing formwork adequate for its loading is condensed, organized, and simplified into a two‐page, step‐by‐step format of equations and instructions that cover most formwork design situations. Plotted design curves are shown and their limitations discussed.     

某厂房工程高支模计算方案

介绍某厂房工程典型高支模的复核计算过程，确保整个高支模系统的安全．     

镍闪速熔炼落地粉尘改造实践

本文着重对镍闪速熔炼落地粉尘的综合治理技术改造方案进行了详细论述,并从经济、社会和环境效益等方面分析了改造后的运行效果。其中真空吸尘系统在冶炼行业落地粉尘治理的首次成功应用,其所带来的意义更是深远,目前此系统不仅在冶炼厂已全面推广,而且对相似行业的设计、改造可提供成功的借鉴经验。