王建斌
【摘要】 隧道传统的衬砌端模均采用小块木模拼装而成,导致中埋止水带只能利用钢筋折叠弯钩固定,导致止水带止水效果较差,给电气化铁路运营带来安全隐患,本文以尖山隧道二衬钢端模的设计及应用为例,确保了施工缝的防水效果,提高了二衬端模的施工效率,为类似工程施工提供参考。
【关键词】 钢端模防水中埋止水带
中图分类号:U45文献标识码: A
Design and application of inner lining steel end
formwork for PDL tunnel
WangJianbin
(No.1 Engineering corporation of China Railway 20th Bureau Group Co.,Led,Suzhou,215151,China)
AbstractTraditionally end formwork of inner lining assembled with small timbers,
this cause mid-water stop can only fixed by bended rebar and the effect of waterproofing is insufficient, and furthermore it will endanger operation of electric railway. This paper illustrates design concept and application of inner lining steel end formwork of by the case of Jianshan tunnel. Water proofing effect at construction joint can be guaranteed and work efficiency of can be improved by using steel end formwork, which can be referred for similar engineering works.
Key words Steel formworkwaterproofingmid-water stop
客运专线隧道拱墙防水形式采用外贴式橡胶止水带+中埋式橡胶(钢边)止水带,目前施工的隧道衬砌端模均采用小块木板拼装而成,造成中埋止水带弯折成90°贴于模板上,导致中埋止水带外露长度不均匀,扭曲变形,直接影响了防水效果与运营安全。
针对以上问题,我们在沪(上海)昆(昆明)客专(云南段)尖山隧道工程衬砌施工中,对端模进行改进,采用了“穿出”法施工,提高了中埋止水带的可靠性,取得了良好的经济效益和社会效益,现将钢端模的设计与应用技术介绍如下:
1 工程概况
沪(上海)昆(昆明)客运专线(云南段)尖山隧道为双线隧道,全长7388m(D1K1024+906~D1K1031+294),隧道纵坡呈人字坡,需要施工衬砌626板。
2 钢端模设计需要解决的问题
a、要满足不同围岩级别衬砌厚度不同的需求。
b、能在已浇筑衬砌段落及待浇筑衬砌段落行走自如,满足足够空间要求。
c、轻便易安,单块重量不超过15 Kg,满足1-2人快速安装
d、牢固、准确固定中埋止水带。
e、端模加固简易可行,拆除时简单快捷。
f、比木板要经济耐用,效率要高,才有推广价值。……