论电气防火封堵施工技术

介绍了电气防火封堵施工作业应具备的条件及施工前应做的准备工作,对电缆沟与竖井防火封堵,电气盘柜底座防火封堵、电缆桥架防火封堵等的施工方法进行了详细分析,并论述了电气防火封堵技术的质量控制及验收方法,以供参考。     

高层建筑缆线的电气防火封堵

电缆敷设的防火封堵措施包括“封”、“堵”、“涂”、“隔”、“包”,最经济有效的方法是“封”、“堵”、“隔”：高层建筑的各类竖向管井及孔洞应严格做好防火封堵;介绍了配电线路的防火封堵措施,对不同防火封堵法进行了比较。     

电缆防火封堵施工方案探讨

本文简要介绍电缆防火封堵的材料,并对阻火墙、阻火隔层、电缆“竖井”和电缆沟（或“水平井”）等的封堵方案进行了探讨。     

某城市电缆隧道的消防设计分析

本文通过对电缆及电缆隧道的几种解决方案比较,提出某城市电缆隧道应设消防分隔和采取防火阻燃措施,消防报警应在每层电缆桥架上按蛇形 布置多级线型感温电缆,应设水喷雾封堵和通风系统,在危险性大、重要性强的区域应设水喷雾灭火系统。     

防火封堵技术在铁路系统的应用研究

介绍了防火封堵技术在铁路信号、电力、通信系统中的应用特点及技术发展,对不同种类的防火封堵材料的性能及应用范围进行了分析,提出了各种防火封堵材料组合使用以达到最佳防火效果的概念,介绍了铁路系统中电缆防火封堵的典型施工结构设计及施工注意事项。     

一种新型通信楼机房电缆防火封堵方法

电缆火灾事故严重影响通信楼机房的安全运行,通过对现行国内常见电缆防火封堵措施的分析,发现存在不足和弊端。提出了一种新型的电缆防火封堵的零维护解决方法,既能将可能发生的火灾限制在最小范围内,又能保证通信楼机房通信网的安全运行。     

高层建筑防火封堵措施

分析了现有建筑规范对高层建筑防火封堵的要求,对防火封堵的性能与措施作深入的分析和探讨。提出高层建筑对防火封堵产品性能特征的建议,期望设计出更加有前瞻性、可持续性的防火封堵产品,以保：卫人民的生命财产安全。     

建筑工程防火封堵现状分析及对策

防火封堵是建筑防火安全的一个重要内容,本文分析了现有建筑设计规范对建筑工程防火封堵的要求,对当前建筑工程防火封堵的存在的问题作了分析和探讨,并提出了对应的方法和措施。     

幕墙层间防火封堵技术探讨

针对高层建筑玻璃幕墙的技术特点,分析了已有建筑规范、标准对幕墙层间防火封堵的要求,对幕墙防火技术与措施作深入的分析和探讨;回顾了幕墙防火封堵技术的发展历程,介绍了合格的幕墙防火封堵产品应该具备的性能,并提出了一种通过UL认证的幕墙防火封堵典型结构;期望幕墙层间防火封堵系统与建筑幕墙形成和谐有机的整体,实现建筑美感与安全的并存。     

高层建筑管线穿墙或楼板洞口的防火封堵措施设计研究

高层建筑防火封堵对于阻止火灾蔓延有重要意义,文章以上海中心大厦管线穿墙、楼板洞口的防火封堵处理情况为例,探究高层建筑防火封堵处理措施。     

电缆实体火灾模拟实验与电缆的选用

介绍了电缆（支架明敷、支架穿管明敷、防火桥架内敷设、防火桥架内穿管敷设、穿管埋墙暗敷5种电缆敷设方式）实体火灾模拟实验的结果，分析了不同类型的电缆的选用。鉴于矿物绝缘电缆良好的耐火性能。推荐使用。     

CFD Simulations of Fire Propagation in Horizontal Cable Trays Using a Pyrolysis Model with Stochastically Determined Geometry

In this paper, a pyrolysis model for a PVC cable is constructed using results from thermogravimetric analysis, microscale combustion calorimeter and cone calorimeter experiments. The pyrolysis model is used to simulate fire propagation in horizontal cable trays. The simulated arrangement corresponds to a cable tray fire experiment from OECD PRISME 2 project. As laying the cables loosely along the horizontal trays is a random process, a novel stochastic method is developed for making the simplified cable tray geometries for the computational fluid dynamics model. In addition, as the simplified cable tray geometry has significantly smaller surface area than a real tray full of cables, the surface area was parametrically adjusted. In contrast to most of the earlier published numerical approaches for simulating cable tray fires, the presented approach does not use empirical correlations for predicting fire propagation and does not require any results from full-scale experiments for calibrating the model. The simulation results are compared to experimental results in terms of heat release rate, mass loss, tray ignition times and lateral flame spread rates. The maximum heat release rate was overpredicted by 8% on average.

     

悬索桥可换式主缆的研究

悬索桥作为跨度最大的桥梁在我国得到了迅猛发展,但悬索桥的上部结构缆索系统的防腐的研究还没有取得令人十分满意的结果,特别是作为悬索桥生命线的主缆防腐。目前桥梁缆索主要还是依靠换索的方式,来解决缆索的防腐以及安全性能问题。悬索桥的吊索、锚碇,斜拉索等都已有可更换缆索的技术,但悬索桥的主缆还未见有可更换的技术和实例。本文主要介绍悬索桥可换主缆及其索鞍、索夹、散索套的结构设计,并重点介绍关键部件索夹设计和其相关试验情况。说明实现主缆可换及主缆防腐的可行性     

桥梁失火拉索性能的试验研究

试验研究了桥梁钢丝拉索失火后整体拉索及其组成钢丝的各项力学性能,得出了拉索失火对拉索各项力学性能的影响的结论,给出了对失火拉索的养护建议。为评估失火后的拉索性能提供了依据,可为评判同类工程事故提供参考。     

Performance of ceramic-block fire stops for power cable installations

Fire losses due to cable fire in thermal power plants and industrial units are mounting. Fire in cable galleries is caused either by an external source or internal heating due to overloading or poor cable insulation. Most of the power cables are laid in groups that run on trays. In the event of fire, cable insulation melts and cable conductors come into contact and generate sparks. The resulting flame spreads through cables and engulf other groups of cables. This leads to damage in control rooms and distribution units that causes power generation disruption and plant shutdown.To minimize the damage and system disturbance due to fire, a new system for cable installation has been developed. The system involves construction of fire stop walls using fire-resistant cavity blocks, heat-resistant wool, and fire-resistant sealant.     

Impact of Flashover Fire Conditions on Exposed Energized Electrical Cords/Cables

There has been prior research exploring the exposure of common electrical cords and cables to fire, but that has traditionally been at the lab scale and under near steady-state exposures. The goal of these experiments was to expose six types of cords and cables in a room-scale compartment with a fuel load sufficient to drive the compartment through flashover. The basic test design was to expose the cords and cables on the floor of a compartment to a growing fire to determine the conditions under which the cord/cable would trip the circuit protection device. All of the cords were energized and installed on a non-combustible surface. The six cables and cords were protected by three different circuit protection devices which were remote from the thermal exposure. This configuration resulted in 18 exposures per experiment. The room fires experiments consisted of three replicate fires with two sofas as the main fuel source, two replicate fires with one sofa as the main fuel source and one fire with two sofas and vinyl-covered MDF paneling on three walls in the room. Each fuel package was sufficient to support flashover conditions in the room. The average peak heat release rate of the sofa fueled compartment fires with gypsum board ceiling and walls prior to suppression was 6.8 MW. The addition of vinyl covered MDF wall paneling on three of the compartment walls increased the pre-suppression peak heat release rate to 12 MW. In each experiment during post flashover exposure, the insulation on the cords and cables ignited and burned through, exposing bare wire. During this period, the circuits faulted. Assessments of both the thermal exposure and physical damage to the cords did not reveal any correlation between the thermal exposure, cord/cable damage, and trip type.     

独塔单索面斜拉桥换索施工

上海恒丰北路斜拉桥为独塔单索面混凝土斜拉桥,跨越铁路、轨道交通线路和城市道路,已使用了十多年。2003年将全桥60根拉索全部更换。该文介绍了该桥换索的施工工艺、拉索安装索力计算、施工支架和换索期间的交通组织措施。为类似换索工程施工积累了宝贵经验。     

A new standard test method for the quantification of fire propagation behavior of electrical cables using Factory Mutual Research Corporation's small-scale flammability apparatus

A new specification test standard for cable fire propagation has recently been developed at Factory Mutual Research Corporation (FMRC), using FMRC's 50 kW-scale flammability apparatus. Guidelines for fire protection of grouped cables in non-combustible industrial and commercial occupancies have been formulated. Cables are classified into three groups on the basis of their fire propagation behavior: Group 1 cables: fire propagation beyond the ignition zone is not likely to occur and fire protection is not required; Group 2 cables: fire propagates slowly beyond the ignition zone and fire protection is required in most applications; and Group 3 cables: fire propagates rapidly beyond the ignition zone and fire protection is always required. This paper describes the concepts associated with the development of the standard test and fire protection guidelines for cables.     

浅谈电缆桥架安装

从桥架定位设计及采购,桥架支架制作及安装,桥架、梯架安装,接地检查等方面介绍了电气安装工程中电缆桥架安装的施工工艺,并对其工艺要求进行了阐述,为电缆桥架的安装提供了参考依据。     

电缆隧道在某大型机械工厂的应用

在同一敷设路径电缆较多的情况下,电缆隧道便于电缆的施工、运行管理和增容。结合已实际投入运行十多年的某大型机械工厂电缆隧道的应用情况,介绍了电缆隧道设计中隧道电缆通风散热计算、隧道的排水、电缆的防火处理问题。