A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Tunnel inverted arch bottom soft foundation treatment construction method
The invention provides a tunnel inverted arch bottom soft foundation treatment construction method, and relates to the technical field of highway tunnels, in the construction process, when high-pressure jet grouting piles or cement mixing piles are adopted for foundation reinforcement, an inverted arch is constructed and filled according to a normal construction process, and then the inverted arch is filled with the cement mixing piles; an inverted arch lining structure is closed, looped and stressed, tunnel primary support vault settlement and peripheral convergence displacement are restrained, PVC pipes are pre-buried at intervals according to the requirement of a design drawing after an inverted arch steel arch frame is constructed, high-pressure jet grouting pile or cement mixing pile construction is conducted after inverted arch and inverted arch filling construction is completed, after the technology is changed, intermediate procedures are greatly reduced, the construction cost is reduced, and the construction efficiency is improved. The tunnel is looped 2 days ahead of time, the situation that the surrounding rock level of the whole section of the tunnel is V-VI surrounding rock at the soft position of the inverted arch foundation is avoided, and the safety and quality problems that the initial supporting vault is too large in settlement and too large in peripheral convergence displacement easily caused by the fact that the inverted arch is not constructed in time, and the vault collapses in serious situations are solved.
本发明提供了一种隧道仰拱底软基处理施工方法，本发明涉及公路隧道技术领域，一种隧道仰拱底软基处理施工方法，本发明在施工中，在采用高压旋喷桩或水泥搅拌桩进行地基加固时，先按正常施工流程施作仰拱及仰拱填充，使仰拱衬砌结构封闭成环受力，抑制隧道初支拱顶沉降和周边收敛位移，在仰拱钢拱架施工后按设计图纸要求间距预埋PVC管，在仰拱及仰拱填充施工完成后再进行高压旋喷桩或水泥搅拌桩施工，该工艺改变后，大大减少了中间工序，使隧道提前2天成环，避免仰拱地基软弱处，整个段落隧道围岩级别都是Ⅴ～Ⅵ围岩，避免仰拱不及时施作容易造成初支拱顶沉降过大、周边收敛位移过大，严重时造成拱顶垮塌等安全、质量的问题。
Tunnel inverted arch bottom soft foundation treatment construction method
The invention provides a tunnel inverted arch bottom soft foundation treatment construction method, and relates to the technical field of highway tunnels, in the construction process, when high-pressure jet grouting piles or cement mixing piles are adopted for foundation reinforcement, an inverted arch is constructed and filled according to a normal construction process, and then the inverted arch is filled with the cement mixing piles; an inverted arch lining structure is closed, looped and stressed, tunnel primary support vault settlement and peripheral convergence displacement are restrained, PVC pipes are pre-buried at intervals according to the requirement of a design drawing after an inverted arch steel arch frame is constructed, high-pressure jet grouting pile or cement mixing pile construction is conducted after inverted arch and inverted arch filling construction is completed, after the technology is changed, intermediate procedures are greatly reduced, the construction cost is reduced, and the construction efficiency is improved. The tunnel is looped 2 days ahead of time, the situation that the surrounding rock level of the whole section of the tunnel is V-VI surrounding rock at the soft position of the inverted arch foundation is avoided, and the safety and quality problems that the initial supporting vault is too large in settlement and too large in peripheral convergence displacement easily caused by the fact that the inverted arch is not constructed in time, and the vault collapses in serious situations are solved.
本发明提供了一种隧道仰拱底软基处理施工方法，本发明涉及公路隧道技术领域，一种隧道仰拱底软基处理施工方法，本发明在施工中，在采用高压旋喷桩或水泥搅拌桩进行地基加固时，先按正常施工流程施作仰拱及仰拱填充，使仰拱衬砌结构封闭成环受力，抑制隧道初支拱顶沉降和周边收敛位移，在仰拱钢拱架施工后按设计图纸要求间距预埋PVC管，在仰拱及仰拱填充施工完成后再进行高压旋喷桩或水泥搅拌桩施工，该工艺改变后，大大减少了中间工序，使隧道提前2天成环，避免仰拱地基软弱处，整个段落隧道围岩级别都是Ⅴ～Ⅵ围岩，避免仰拱不及时施作容易造成初支拱顶沉降过大、周边收敛位移过大，严重时造成拱顶垮塌等安全、质量的问题。
Tunnel inverted arch bottom soft foundation treatment construction method
一种隧道仰拱底软基处理施工方法
YU CHONGJUN (author) / LI ZHIZE (author) / CHEN SHIJUN (author) / LIN SONG (author) / QIU LIN (author) / PAN LULU (author) / WANG RONGLIN (author)
2023-08-18
Patent
Electronic Resource
Chinese
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