The utility model discloses a bending hook type lock foot anchor rod for tunnel steel arch frame, which is characterized in that the bending hook type lock foot anchor rod is divided into two parts, namely, a short cross bar and a lock foot anchor head bend hook; before installation, the short cross bar is welded in the steel processing shed outside the tunnel with the bended arch frame on both sides of the surrounding rock, and the bending hook type anchor rod is assembled in the tunnel and connected with the short cross bar. According to the characteristics of conventional lock-foot bolt construction, the bending hook type lock-foot bolt was redesigned and used. The lock-foot action point of lock-foot bolt was transferred from I-shaped steel far from the side of surrounding rock to the side of surrounding rock, which greatly improved the lock-foot ability. The spot welding anchor in the tunnel was transformed into the centralized prefabrication of the steel processing shed outside the tunnel, thus avoiding welding fume in the tunnel and using short cross bars. As the drilling guide point of the lock anchor hole, it can accurately construct the lock anchor, save the raw material of the anchor, save the working procedure time, and achieve the purpose of increasing the benefit of the project.
【技术实现步骤摘要】
隧道钢拱架弯钩型锁脚锚杆
本技术涉及一种锁脚锚杆,具体讲是一种隧道钢拱架弯钩型锁脚锚杆。
技术介绍
在《公路隧道施工技术规范》(JTGF60-2009)中没有关于锁脚锚杆施工强制性要求,因此隧道锁脚锚杆施工工艺及检验方法基本处于空白状态,往往造成隧道锁脚锚杆“锁脚”能力不能有效保证,严重影响了初期支护的稳定性,给施工和结构安全带来巨大隐患,所以锁脚锚杆是否有效“锁脚”对我们隧道施工和结构安全起到十分重要的作用。目前在隧道锁脚锚杆施工中,很难保证焊接质量,传统的施工方法是:锁脚锚杆常常采用洞外弯制成L型,洞内与钢拱架焊接的施工工艺,该种施工工艺简单,但施工焊接质量难以保证,且焊接作业时给洞内造成大量焊接烟尘,由于洞内通风环境受限,作业保护不当的话,会产生焊工尘肺、金属热、锰中毒等职业病,现场焊接锁脚锚杆占用工序时间,增加隧道单循环作业时间,同时现场仰焊锁脚锚杆质量难以保证,从而产生了项目成本、工期和职业病防治的压力。
技术实现思路
因此,为了解决上述不足,本技术在此提供一种隧道钢拱架弯钩型锁脚锚杆;本次根据隧道锁脚锚杆的特点,重新设计了锁脚锚杆形状种类,运用该弯钩型锁脚锚杆可有效保证锚杆的“锁脚”能力,同时节约了洞内焊接锁脚锚杆时间,避免了洞内产生焊接烟尘,减少了部分锚杆材料,达到了为项目增加效益的目的。本技术是这样实现的,构造一种隧道钢拱架弯钩型锁脚锚杆,其特征在于:该弯钩型锁脚锚杆包括短节横筋、锁脚锚杆头弯钩;短节横筋左右分别比工字钢宽度长5cm,锁脚锚杆头弯钩弯制半径与锚杆杆体半径相当。根据本技术所述隧道钢拱架弯钩型锁脚锚杆,其特征在于:洞外将短节横筋焊接在加 ...
【技术保护点】
1.一种隧道钢拱架弯钩型锁脚锚杆,其特征在于:该弯钩型锁脚锚杆包括短节横筋(1)、锁脚锚杆头弯钩(2);短节横筋左右分别比工字钢(3)宽度长5cm,锁脚锚杆头弯钩(2)弯制半径与锚杆杆体半径相当。
【技术特征摘要】
1.一种隧道钢拱架弯钩型锁脚锚杆,其特征在于:该弯钩型锁脚锚杆包括短节横筋(1)、锁脚锚杆头弯钩(2);短节横筋左右分别比工字钢(3)宽度长5cm,锁脚锚杆头弯钩(2)弯制半径与锚杆杆体半径相当。2....
【专利技术属性】
技术研发人员:赵刚应,孙立成,汪捍东,康海波,范仁玉,
申请(专利权)人:四川公路桥梁建设集团有限公司,
类型:新型
国别省市:四川,51
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