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A platform for research: civil engineering, architecture and urbanism
Supporting structure and method for hole exit at steep cliff
The invention discloses a supporting structure and a supporting method for tunnel exit from a steep cliff at a portal, and belongs to the technical field of tunnel engineering, the supporting structure comprises an upper step expanding excavation area and a lower step which are arranged at the portal, an advanced middle pilot tunnel is arranged in the middle of the upper step expanding excavation area, primary support 22a I-shaped steel is arranged after the advanced middle pilot tunnel is excavated, and a secondary support 22a I-shaped steel is arranged after the primary support 22a I-shaped steel is excavated. The supporting structure further comprises an active protective net and a protective retaining wall, the active protective net and the protective retaining wall are arranged on the periphery of the hole and used for reinforcing surrounding rock on the periphery of the hole, the active protective net is fixed through anchor cables, and a plurality of guide pipe gradient positioning clamps are arranged at the top of the primary supporting 22a I-shaped steel. And a middle pipe shed which is constructed from the inside of the hole to the outside of the hole and is 76mm in diameter and 9m in advance is arranged on each guide pipe gradient positioning fixture through a middle pipe shed sleeve of 89mm in diameter. By the adoption of the supporting structure and method for the steep cliff exit of the hole, the problem that the hole is located on a high steep cliff wall and does not have the condition of entering the hole can be solved.
本发明公开了一种洞口陡崖出洞的支护结构及方法，属于隧道工程技术领域，包括在洞口设置的上台阶扩挖区和下台阶，所述上台阶扩挖区的中间设置有超前中导坑，所述超前中导坑开挖后设置有初支22a工字型钢，所述支护结构还包括设置在洞口四周的用于加固洞口周边围岩的主动防护网和防护挡墙，所述主动防护网通过锚索固定，所述初支22a工字型钢的顶部设置有若干个导向管坡度定位卡具，若干所述导向管坡度定位卡具上均通过φ89mm中管棚套管设置有由洞内向洞外施做的φ76mm超前9m中管棚。本发明采用上述结构的一种洞口陡崖出洞的支护结构及方法，能够解决洞口处于高陡崖壁、不具备进洞条件的问题。
Supporting structure and method for hole exit at steep cliff
The invention discloses a supporting structure and a supporting method for tunnel exit from a steep cliff at a portal, and belongs to the technical field of tunnel engineering, the supporting structure comprises an upper step expanding excavation area and a lower step which are arranged at the portal, an advanced middle pilot tunnel is arranged in the middle of the upper step expanding excavation area, primary support 22a I-shaped steel is arranged after the advanced middle pilot tunnel is excavated, and a secondary support 22a I-shaped steel is arranged after the primary support 22a I-shaped steel is excavated. The supporting structure further comprises an active protective net and a protective retaining wall, the active protective net and the protective retaining wall are arranged on the periphery of the hole and used for reinforcing surrounding rock on the periphery of the hole, the active protective net is fixed through anchor cables, and a plurality of guide pipe gradient positioning clamps are arranged at the top of the primary supporting 22a I-shaped steel. And a middle pipe shed which is constructed from the inside of the hole to the outside of the hole and is 76mm in diameter and 9m in advance is arranged on each guide pipe gradient positioning fixture through a middle pipe shed sleeve of 89mm in diameter. By the adoption of the supporting structure and method for the steep cliff exit of the hole, the problem that the hole is located on a high steep cliff wall and does not have the condition of entering the hole can be solved.
本发明公开了一种洞口陡崖出洞的支护结构及方法，属于隧道工程技术领域，包括在洞口设置的上台阶扩挖区和下台阶，所述上台阶扩挖区的中间设置有超前中导坑，所述超前中导坑开挖后设置有初支22a工字型钢，所述支护结构还包括设置在洞口四周的用于加固洞口周边围岩的主动防护网和防护挡墙，所述主动防护网通过锚索固定，所述初支22a工字型钢的顶部设置有若干个导向管坡度定位卡具，若干所述导向管坡度定位卡具上均通过φ89mm中管棚套管设置有由洞内向洞外施做的φ76mm超前9m中管棚。本发明采用上述结构的一种洞口陡崖出洞的支护结构及方法，能够解决洞口处于高陡崖壁、不具备进洞条件的问题。
Supporting structure and method for hole exit at steep cliff
一种洞口陡崖出洞的支护结构及方法
LIU JIANGUO (author) / SHANG HAIBO (author)
2024-04-12
Patent
Electronic Resource
Chinese
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