Double-span simply-supported inverted arch trestle rapid construction method
一种快速、工法的技术,应用在井筒衬砌、隧道衬砌、地下硐室等方向,能够解决进度不足2m、安全步距超标、加大掌子面与衬砌间距离等问题,达到节约施工时间、施工安全、节约仰拱初支时间的效果
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[0029] A rapid construction method for a double-span simply supported inverted arch trestle bridge, such as Figure 1-3 As shown, it mainly includes the following steps:
[0030] 1. Construction of the first set of inverted arch primary support trestle area
[0031] 1) Specifications of inverted arch initial support trestle bridge. According to the specific gravity of the tunnel's overall surrounding rock, the length of the initial support inverted arch trestle is selected. If the tunnel is dominated by surrounding rocks of grade II-III, the operating space for the initial branch of the inverted arch trestle can be selected as 12m. If the tunnel is dominated by surrounding rocks of grade IV-V, the operating space for the primary branch of the inverted trestle bridge is selected to be 6-10m.
[0032] 2) Excavation at the initial support section of the inverted arch. Each excavation of surrounding rocks of grades IV-V shall not exceed the length of the distance between three...
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