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钢接头结构优化(一)-江门艾瑞精密机械经验分享

来源:本站 时间:2019-03-27 11:09:03 浏览次数: 113

[导读]: 钢接头由内圈连接钢板、外圈连接钢板、小加劲、隔板体系组成,在隧道横截面上,隔板是每隔一段距离布置一档。连接钢板均是工厂内分块制作,发运至隧道安装现场。钢接头焊接完成后,形成了永久的封闭内部,灌注高流动性混凝土,完成隧道的连接并实现最后的贯通。

港珠澳大桥海底隧道由33节沉管管节和一个最终接头组成,最终接头与沉管管节的连接是在水下进行。利用浮吊将最终接头吊装就位,其内嵌液压千斤顶系统启动,顶推小梁结构向远离最终接头本体的方向移动,带动M止水带张拉,移动到一定距离后,顶推小梁端部的Gina止水带抵达相邻管节的钢帽,Gina止水带压紧后,即实现管节内外部的隔离,最后对管节内部排水,形成可施焊的空间,钢接头的焊接就在该空间内进行。钢接头由内圈连接钢板、外圈连接钢板、小加劲、隔板体系组成,在隧道横截面上,隔板是每隔一段距离布置一档。连接钢板均是工厂内分块制作,发运至隧道安装现场。钢接头焊接完成后,形成了永久的封闭内部,灌注高流动性混凝土,完成隧道的连接并实现最后的贯通。连接钢板的焊接存在大量仰焊作业,且作业空间受到限制,国内外没有可借鉴的经验,存在如下难点:

The hong kong-zhuhai-macao bridge undersea tunnel is composed of 33 immersed pipe joints and one final joint. Using floating crane hoisting in place, will eventually joint embedded hydraulic jack system startup, pusher trabecular structure to the ontology of direction, away from the final joint drive M water-stop tensioning, moved to a certain distance, pusher trabecular end of Gina water stop arrived in neighboring union steel cap, Gina water stop after compaction, namely realize union internal and external isolation, finally, the internal drainage pipe joint, forming a space of welds, the welding of steel joint is conducted in the space. The steel joint is composed of inner ring connection steel plate, outer ring connection steel plate, small stiffening and diaphragm system. On the tunnel cross section, the diaphragm is arranged at a distance of one gear. The connecting steel plates are made in pieces in the factory and shipped to the tunnel installation site. After the completion of the welding of the steel joint, the permanent closed interior is formed and filled with high fluidity concrete to complete the connection of the tunnel and realize the final penetration. There are a lot of overhead welding operations in the welding of connecting steel plates, and the working space is limited. There are no referential experiences at home and abroad, and the difficulties are as follows:

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(1)施工环境恶劣,焊接空间受限。钢接头的焊接是在Gina 临时止水的状态下进行,并且结合腔内部环境潮湿,无自然通风条件,最终接头与钢帽间的作业空间净距仅1米。

(2)钢接头焊缝工作量大,焊接质量要求高,对接焊缝必须全熔透焊接,100%通过UT/MT 探伤检测。

(3)钢接头焊接施工的周期必须尽量短。由于钢接头焊接完成之前,结合腔内仅依靠油缸顶推GINA 止水带隔绝海水,风险太高。所以尽早完成结合腔内钢接头连接钢板的焊接工作是沉管工程能够安全贯通的有效保障。

(4) 往结合腔内运输构件的工作量很大,劳动强度大且安全风险也高。

(1) poor construction environment and limited welding space. The welding of the steel joint is carried out under Gina's temporary water stop state, and combined with the damp internal environment of the cavity without natural ventilation conditions, the final working space between the joint and the steel cap is only 1 meter apart.

(2) the workload of steel joint welding is large, and the welding quality is required to be high. The butt welding must be fully penetration welding, and 100% pass UT/MT inspection.

(3) the steel joint welding cycle must be as short as possible. Before the completion of the welding of the steel joint, it is too risky to isolate sea water in the joint cavity only by pushing GINA water stop on the top of the oil cylinder. Therefore, it is an effective guarantee to complete the welding work of connecting steel plate with the steel joint in the cavity as soon as possible.

(4) it takes a lot of work to transport components into the bonding cavity, with high labor intensity and safety risk.

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我们从以下几个方面对钢接头连接钢板做出调整, 有效降低钢接头连接钢板现场焊接的难度。

(1)优化钢接头连接钢板的划分,减少现场焊接长度,切实地降低现场焊接工作的难度。

(2) 将部分钢接头的连接钢板悬挂到最终接头的结构上(在工厂内),以减少施工现场连接钢板的搬运量,大大降低劳动强度,减少安全风险。

(3)对钢接头结构进行做局部改进,以增强钢接头连接钢板焊接过程中整个结构的稳定性、安全性。

We from the following aspects of the steel joint joint steel plate to make adjustments, effectively reduce the steel joint joint steel plate site welding difficulty.

(1) optimize the division of steel joint connecting steel plate, reduce the length of on-site welding, and effectively reduce the difficulty of on-site welding.

(2) hang the connecting steel plates of some steel joints to the structure of the final joint (in the factory), so as to reduce the carrying amount of the connecting steel plates on the construction site, greatly reduce the labor intensity and reduce the safety risk.

(3) local improvements are made to the steel joint structure to enhance the stability and safety of the whole structure during the welding process of the steel joint joint plate.

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