The utility model relates to a locking device for the initial support steel frame of a tunnel, which comprises a locking steel plate and a connecting steel plate at the butt of the upper and lower steel frames; the locking steel plate is an L-shaped folded plate composed of a plane and a side elevation, the plane of which is welded to the bottom end face of the upper steel frame, and the elevation is located between the upper steel frame and the initial shotcrete; the connecting steel plate is a flat plate and is welded to the top end of the lower steel frame. The plane of the locking steel plate and the connecting steel plate are fixed by bolts, and the vertical plane of the locking steel plate is provided with a prestressing anchor bolt for the surrounding rock behind it. The utility model replaces the lock-foot bolt and the connecting mode, uses the pre-stressed lock-foot bolt instead of the traditional lock-foot bolt, uses the locking steel plate instead of the traditional connection mode of welding the lock-foot bolt on the steel frame, fills the gap between the bolt and the surrounding rock and the bolt body by grouting to increase the adhesion force between the bolt and the surrounding rock and the rigidity of the bolt; and applies the pre-stress to the locking steel plate. Fixed on the surrounding rock to ensure the locking effect of the steel frame.
【技术实现步骤摘要】
一种隧道初期支护钢架的锁固装置
本技术属于交通工程
,具体涉及一种隧道初期支护钢架的锁固装置。
技术介绍
隧道初期支护通常采用锚喷网技术,主要由喷射混凝土、钢架、钢筋网、锚杆等组成,支护中喷射混凝土的厚度、是否设置钢架等由隧址区围岩特性决定,隧道施工中往往要求及时支护,而台阶法施工过程中,钢架往往无法及时封闭,钢架分节接头处主要采用锁脚锚杆锁定,通常锁脚锚杆大多采用普通的小导管等,一端锁固在围岩中,一端焊接在钢架上来实现锁固钢架,锁固质量难以保证。
技术实现思路
本技术的目的是提供一种隧道初期支护钢架的锁固装置,采用预应力锁脚锚杆代替传统的锁脚锚杆,采用锁固钢板装置代替传统的将锁脚锚杆焊接在钢架上的连接方式,可有效确保钢架的锁固质量。本技术所采用的技术方案为:一种隧道初期支护钢架的锁固装置,其特征在于:包括上下两节钢架对接处的锁固钢板和连接钢板;锁固钢板是由平面和一侧立面组成的L形折板,其平面焊接到上部钢架底部端面,立面位于上部钢架和初喷混凝土之间;连接钢板为一平板,焊接到下部钢架顶部端面;锁固钢板的平面与连接钢板通过螺栓固定,锁固钢板的立面上设置有向其后方围岩 ...
【技术保护点】
1.一种隧道初期支护钢架的锁固装置,其特征在于:包括上下两节钢架(4)对接处的锁固钢板(2)和连接钢板(3);锁固钢板(2)是由平面和一侧立面组成的L形折板,其平面焊接到上部钢架(4)底部端面,立面位于上部钢架(4)和初喷混凝土(8)之间;连接钢板(3)为一平板,焊接到下部钢架(4)顶部端面;锁固钢板(2)的平面与连接钢板(3)通过螺栓固定,锁固钢板(2)的立面上设置有向其后方围岩(9)打设的预应力锁脚锚杆(1)。
【技术特征摘要】
1.一种隧道初期支护钢架的锁固装置,其特征在于:包括上下两节钢架(4)对接处的锁固钢板(2)和连接钢板(3);锁固钢板(2)是由平面和一侧立面组成的L形折板,其平面焊接到上部钢架(4)底部端面,立面位于上部钢架(4)和初喷混凝土(8)之间;连接钢板(3)为一平板,焊接到下部钢架(4)顶部端面;锁固钢板(2)的平面与连接钢板(3)通过螺栓固定,锁固钢板(2)的立面上设置有向其后方围岩(9)打设的预应力锁脚锚杆(1)。2.根据权利要求1所述的一种隧道初期支护钢架的锁固装置,其特征在于:预应力锁脚锚杆(1)为中空杆体,其外端设置有涨壳锚固头(10)、垫片(11)和螺母(12);涨壳锚固头(10)位于围岩(9)内预应力锁脚锚杆(1)的端头,垫片(11)位于锁固钢板(2)...
【专利技术属性】
技术研发人员:符亚鹏,靳宝成,何永旺,李国良,严文翔,陈霄汉,史先伟,刘国庆,司剑钧,张泰,严广艺,马腾,
申请(专利权)人:中铁第一勘察设计院集团有限公司,
类型:新型
国别省市:陕西,61
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