QLM2×80龙门吊拆除方案

QLM2×80(10)-38.6/15型

龙 门 吊 拆 除 方 案

编 制： 审 核： 审 批：

编制单位；中铁七局郑西客运专线二项目部 编制时间：二〇〇八年十月二十七日

中铁七局郑西客运专线二项目部 QLM2×80(10)-38.6/15型龙门吊拆除方案

目 录

目录 ······································································································ 1 第一章 概述 ······················································································· 2 1.1 编制依据 ························································································ 2 1.2 工程概况 ························································································ 2 第二章 拆除准备工作 ········································································ 2 2.1 场地及地锚准备 ············································································· 3 2.2 各主要部件清单 ············································································· 3 2.3 机械配备 ························································································ 3 2.4 人员配备 ························································································ 4 第三章 拆除作业 ················································································ 4 3.1 作业工况 ························································································ 4 3.2 受力计算 ························································································ 5 3.3 安全系数核算················································································· 5 3.4 拆除电气系统················································································· 6 3.5 起重天车的拆除 ············································································· 6 3.6 主梁的拆除 ···················································································· 7 3.7 支腿的拆除 ···················································································· 7 3.8 大车行走机构的拆除 ····································································· 7 第四章 安全技术要求 ········································································ 8 第五章 应急预案 ················································································ 8 第六章 应急预案汇编 ······································································ 13

第 1 页 共 21 页

中铁七局郑西客运专线二项目部 QLM2×80(10)-38.6/15型龙门吊拆除方案

第一章 概 述

1.1编制依据

1. QLM2×80(10)-38.6/15型龙门吊结构原理图纸 2.《起重机械安全规程》 3. 实际勘测拆除现场地形 4. 机械、电气维护要求 1.2 工程概况

用于中铁七局郑西客运专线制梁场的二台QLM2×80(10)-38.6/15型龙门吊，由温州合力建筑机械有限公司制造，跨度38.6m，起升高度15m。龙门吊支腿采用三角钢型双刚腿，下部大车行走机构为三轮单轨式结构。主梁为三角型双主梁，两主梁端部、中部以连系梁横向连接。每个主梁由五段组成，最大节段9.65m。主梁上部安装的两台起重天车各有一台卷扬机，可实现单动和联动。本工程计划在两个制梁区的合适位置实施拆除工作，场地长度90m，宽约20m。

该型龙门吊拆除工程首先把龙门吊停放到指定位置，支腿四个角的行走轮箱用硬木垫好，防止倾翻。两端的固定支腿各用四根揽风绳固定好。先使用QY100汽车吊分别拆下两台起重天车，然后用二台QY100型汽车吊抬吊主梁落到地面，用一台QY100和QY50汽车吊分别拆除两端的固定支腿，最后使用一台QY25汽车吊拆除剩余部件。整个拆除过程分四部分组成，即吊下起重天车、拆掉主梁、拆掉支腿、拆除大车行走各台车。

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中铁七局郑西客运专线二项目部 QLM2×80(10)-38.6/15型龙门吊拆除方案

第二章 拆除准备工作

2.1 场地及地锚准备

龙门吊拆除场地选在制梁场的西制梁区，长约90m，宽约20m。地面已经全部硬化，能够承受大型吊车的重量。在龙门吊两侧支腿处设八个地锚点，用于拉支腿揽风绳,见图示一。揽风绳与地面夹角不大于45o,揽风绳端各使用不少于四个绳卡，通过5T手拉葫芦与地锚连接并拉紧。

在地面搭设放起重天车的方木垛、放主梁的方木垛（高出轨面）、放支腿的方木垛。 2.2 各主要部件重量清单

QLM2×80-38.6/15龙门吊部件重量表

序号 1 2 3 4 5 6 7 8 名称 主梁Ⅰ 主梁Ⅱ 主梁Ⅲ 支腿 连接梁 天车 电动葫芦 大车 数量 4 4 2 4 2 2 1 4 单重 4.5 4.44 4.7 7 2 9.5 4.5 3 总重 18 17.76 9.4 28 4 19 4.5 12 备注 2.3 机械配备

序号 1 2 3 4 名称 汽车吊 汽车吊 汽车吊 揽风绳 规格 QY100 QY50 QY25 Φ19.5 单位 台 台 台 m 数量 2 1 1 180 备注 Ⅱ级 第 3 页 共 21 页

中铁七局郑西客运专线二项目部 QLM2×80(10)-38.6/15型龙门吊拆除方案

5 6 7 8 9 10 11 12 13 麻绳 电动扳手 常用工具 氧气、乙炔设备 起重钢丝绳 钢垫瓦 道木 手拉葫芦 钢丝绳卡 Φ16 ￠52、￠30 25×25×250 5T 22 m 把 套 套 根 块 根 个 个 40 2 2 1 各4 20 80 8 64 Ⅱ级 2.4 人员配备

序号 1 2 3 4 5 工 种 起重工 指 挥 司 索 机械工 普 工 合计 单位 人 人 人 人 人 数量 4 1 4 10 4 23 备注 第三章 拆除作业

3.1 作业工况

3.1.1起吊时最大作业工况

序号 设备名称 本体重量 吊装重量（t） 吊车型号 (t) 9.5 29 16 QY100 QY100 QY100 9.5 14.5 14.5 16 主吊车 杆长 (m) 27 25 25 25 作业半径 (m) 7 7 7 8 额载 (t) 39 40 40 35 1 2 3 起重天车部件 主梁部件 刚支腿部件 3.1.2 落下时最大作业工况

序号 设备名称 本体重量（t） 吊车 主吊车 起吊重杆长 作业半额载 溜尾重量 （t） QY50吊车 杆长 （m） 作业半径（m） 额载 （t） 量（t） （m） 径（m） （t） 第 4 页 共 21 页

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