浅谈建筑工程中机电系统的设计深化

依照国际惯例实行建筑机电系统设计深化与施工为一体的工程总承包机制,要求机电施工单位对招标图纸进行再设计绘制成施工图纸。文章对设计深化工作的实施提出了措施,成立了机构,完成了设计深化工作,并在工程实践中得到印证,取得了预期的效果。     

机电安装工程图纸的深化设计流程及要求

当前，对机电安装工程的要求不仅限于按图施工，图纸的深化设计也是提高安装品质的主要手段之一，同时对施工单位提出了新的挑战，本文就图纸深化设计的流程及要求供同行们探讨。     

BIM技术在机电安装工程创优中的应用

本文以湖北省医养康复中心项目为例,在机电安装工程前期创优策划阶段进行全方位的BIM建模和深化设计,完成机电管线的综合布局、成品支架及型钢支架的设计图纸、机房深化方案、管井优化调整、屋面管线优化、装配式机房、施工交底等,大大提高了机电安装策划的精细度和深度,减少了大量不必要的拆改返工,使很多大体量、高难度、抢工期的项目能够实现一次成优,为实现精细化施工、高品质建造打下了坚实的基础。     

特大型商业综合体机电深化设计的研究分析

本文以武汉恒隆广场购物中心项目为例,在设计和施工阶段通过机电深化设计解决原设计的"错漏碰缺"、专业协调难、净高不足、出图报审效率低等问题,有效地提高了图纸的质量和施工效率,提升了项目建造品质.     

型钢混凝土组合结构深化设计探讨

钢结构深化设计工作对于型钢混凝土组合结构而言十分重要,它不仅仅需要完成设计图纸的细化,还需考虑与土建、机电等专业的配合以及加工、运输、安装工作的协调问题。本文从节点设计、施工细节、图纸审核、沟通协调等方面出发,结合研究课题取得的成果即《实用钢结构节点标准构造图集》,探讨了型钢混凝土组合结构的深化设计方法和要点,提出了强化设计人员业务素质、注重结构细节设计等措施,为同类结构形式的深化设计工作提供借鉴和参考。     

浅谈市政工程图纸设计与管理方法策略

市政工程中图纸的设计与管理对保证工程质量具有极其重要的影响,工程图纸的设计要做好施工前期准备工作、施工图纸设计以及对工程竣工图的设计。另外,对图纸的管理工作严格规范的进行,做好图纸的接收、申报、接收和存放工作。     

简论建筑机电安装工程施工管理

建筑机电系统是建筑的血脉,机电系统的好坏直接影响着建筑质量和使用水平。建筑机电安装工程施工管理是影响建筑机电安装工程的最主要因素。文章从图纸设计管理．组织管理、合同管理、施工进度管理、质量管理,施工安全管理六个方面阐述了建筑机电安装工程施工管理理论。     

建筑机电安装工程施工管理概述

建筑机电系统是建筑的血脉,机电系统的好坏直接影响着建筑质量和使用水平。建筑机电安装工程施工管理是影响建筑机电安装工程的最主要因素。文章从施工安全管理、图纸设计管理、组织管理、合同管理、施工进度管理、质量管理六个方面阐述了建筑机电安装工程施工管理理论。     

在无锡市机电安装工业化现场观摩会上的讲话

2013年12月26日,无锡市召开了一次机电安装工业化现场观摩会。本次会议是无锡市建筑业企业转型升级系列活动中的机电安装工业化专篇,也是在建筑行业发展面临的诸多问题以及机电安装行业如何以新思路、新举措保持企业持续健康发展的背景下所召开的一次现场观摩推进会议。与会人员实地参观了由无锡市工业设备安装有限公司承建的"无锡市地铁1号线太湖广场地下空间机电安装工程"现场。该工程作为实现安装工业化、变革施工生产模式的代表性工程之一,运用图纸深化设计、工厂化预制、信息化管理、机械化施工的施工模式所展现出的实际成效受到了广泛的关注和好评。本期刊登中国安装协会专职副会长杜昌熹在现场观摩会上的讲话,及无锡市地铁1号线太湖广场地下空间机电安装工程项目现场经理林孝胜的《机电安装工程工业化的探索和运用》一文,供大家参考,以此共同推进机电安装工业化的进程,为推动安装行业生产方式的转变多做贡献。     

BIM技术在医院机电施工图深化中的应用

本文以江都人民医院异地新建工程为例,探讨了 BIM技术在医院建筑管线综合设计中的应用,包括管线碰撞、净空分析、空间优化和信息管理等,医院机电施工通过BIM协同平台辅助深化设计,施工一体化,提升了施工过程中各专业(设计、建筑、机电等)的协调能力,提高了医院建筑的综合效益.     

Estimation of Parameters of Universal Distribution of Moments of Failure of Products

A method is proposed for estimating the parameters of a mixture of exponential and Weibull distributions for which the accuracy of preliminary estimates obtained by graphical analysis is refined in accordance with the criterion of maximum likelihood. The efficiency of the proposed method is supported by the results of statistical modeling.     

Evaluation of optical properties of highly scattering media by moments of distributions of times of flight of photons

A novel method for the determination of the optical properties of tissue from time-domain measurements is presented. The data analysis is based on the evaluation of the first moment and the second centralized moment, i.e., the mean time of flight and the variance of the measured distribution of times of flight (DTOF) of photons injected by short (picosecond) laser pulses. Analytical expressions are derived for calculation of absorption and of reduced scattering coefficients from these moments by application of diffusion theory for infinite and semi-infinite homogeneous media. The proposed method was tested on experimental data obtained with phantoms, and results for absorption and reduced scattering coefficients obtained by the proposed method are compared with those obtained by fitting of the same data with analytical solutions of the diffusion equation. Furthermore, the accuracy of the moment analysis was investigated for a range of integration limits of the DTOF. The moment analysis may serve as a comparatively fast method for evaluating optical properties with sufficient accuracy and can be used, e.g., for on-line monitoring of optical properties of biological tissue.     

Analysis of the rate of propagation of the wave of change of boiling modes

An approximate analytical expression is derived for the velocity of the front of the wave of change of boiling modes on a rod and on a plate. The impact of the Thomson effect and of the heater orientation in the gravity field is included. Adequate agreement is demonstrated between the derived relations and experimental data.     

Estimation of potentialities of methods of summation of direct measurement errors

Conventional methods for summation of direct measurement errors are considered. Conditions under which these methods provide consistent results are stated. It is proposed to utilize for characteristic of the total error, its interval estimator or the half-sum of the value obtained by adding up its arithmetic and geometric random errors.Translated from Izmeritel'naya Tekhnika, No. 4, pp. 10–12, April, 1995.     

空压机轴承箱蜗壳温度探头油封改造

由于空压机进气侧轴承箱蜗壳温度探头密封效果不好,使空压机及其后续管道受到油污染。后将温度探头的O形圈密封改为骨架油封,杜绝了轴承箱漏油问题。文章简介空压机的结构和技术参数,详细介绍了骨架油封的制作和优点。     

Characteristics of mechanical properties of materials in studies of conditions of attainment of marginal states

It is shown that conditions of attainment of marginal states in the material of structural components are formulated on the basis of analysis of force and deformation criteria of formation and development of destruction. The parameters of these criteria are data on types of structural materials, standard and special characteristics of their mechanical properties, structural forms of considered elements of the equipment, and their operating stress loading. In this case, the construction of a system of state equations for describing interrelation of current damage, external actions, and responses to them is based on the concept of calculating variations in properties of materials at all stages of the design life cycle.     

Determination of parameters of microstructural inhomogeneity of deformation of metals by the method of modeling

The article suggests a method of evaluating the microstructural inhomogeneity of deformation of metals by modeling. The method includes the measurement of deformations of metal according to meshes of a dividing grid with small base and the calculation of the distribution parameters of microdeformations in model representation. It is shown that the modeling method makes it possible objectively to evaluate the microinhomogeneity of deformation of metals independently of the chosen mesh size of the dividing grid. New structural characteristics are introduced: the base and wave of variation expressing the degree of crumbling or amalgamation of metal grains by inhomogeneity of deformation.Translated from Problemy Prochnosti, No. 7, pp. 40–44, July, 1991.     

水三相点复现的不确定度评定

水三相点是开尔文热力学温度的唯一基准点，也是ITS-90国际温标重要的定义固定点。因此，水三相点不确定度分析对整个温标的建立、温度量值传递起着至关重要的作用。近3年来，中国计量科学研究院研制出一系列高质量的水三相点容器，加强了水三相点的研究，为不确定度的分析提供了更为可靠的实验依据。同时，不确定度的分析也是客观评价新研制容器性能的一个重要指标。因此，根据实验结果对新研制容器所复现的水三相点进行了不确定度评定。评定结果表明，其扩展不确定度为0．16mK(k=2．69，P=0．99)。