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A platform for research: civil engineering, architecture and urbanism
Reverse tunnel entering construction method for tunnel special-shaped protection arch on slope accumulation body
The invention relates to a reverse tunnel entering construction method for a tunnel special-shaped protection arch on a slope accumulation body. The reverse tunnel entering construction method comprises the steps that the protection arch is divided into a front section and a rear section to be constructed in sequence, an upper section is constructed firstly for each section and then a lower section is constructed for each section; sectional and batched excavation and sectional and batched bottom falling are adopted for tunnel entering excavation, the single excavation amount is reduced as muchas possible, it is guaranteed that tunnel entering excavation is carried out under supporting of the protection arch and an advanced long pipe shed, and construction safety is guaranteed; and the structure of the protection arch is in a special shape, the heights of arch feet on the two sides are different, specifically, it is guaranteed that the arch feet fall on bedrock according to the elevation of the bedrock on site, the excavation amount is greatly reduced, construction disturbance to the slope accumulation body is reduced, the project amount of side slope and upward slope protection issaved, the construction cost can be reduced, and the construction period is shortened.
本发明涉及一种坡积体上隧道异形护拱逆做进洞施工方法，将护拱分两前后两段先后施工，每段先施工上断面，后施工下断面；进洞开挖采用分段分次开挖、分段分次落底，尽量减少单次开挖量，确保在护拱及超前长管棚的支撑下进行隧道进洞开挖，保证了施工安全；护拱结构为异形，两侧拱脚高度不同，具体根据现场基岩标高，保证拱脚落在基岩上即可，大大减少了开挖量，降低了对坡积体的施工扰动，节省了边、仰坡防护的工程量，能降低施工成本，缩短施工周期。
Reverse tunnel entering construction method for tunnel special-shaped protection arch on slope accumulation body
The invention relates to a reverse tunnel entering construction method for a tunnel special-shaped protection arch on a slope accumulation body. The reverse tunnel entering construction method comprises the steps that the protection arch is divided into a front section and a rear section to be constructed in sequence, an upper section is constructed firstly for each section and then a lower section is constructed for each section; sectional and batched excavation and sectional and batched bottom falling are adopted for tunnel entering excavation, the single excavation amount is reduced as muchas possible, it is guaranteed that tunnel entering excavation is carried out under supporting of the protection arch and an advanced long pipe shed, and construction safety is guaranteed; and the structure of the protection arch is in a special shape, the heights of arch feet on the two sides are different, specifically, it is guaranteed that the arch feet fall on bedrock according to the elevation of the bedrock on site, the excavation amount is greatly reduced, construction disturbance to the slope accumulation body is reduced, the project amount of side slope and upward slope protection issaved, the construction cost can be reduced, and the construction period is shortened.
本发明涉及一种坡积体上隧道异形护拱逆做进洞施工方法，将护拱分两前后两段先后施工，每段先施工上断面，后施工下断面；进洞开挖采用分段分次开挖、分段分次落底，尽量减少单次开挖量，确保在护拱及超前长管棚的支撑下进行隧道进洞开挖，保证了施工安全；护拱结构为异形，两侧拱脚高度不同，具体根据现场基岩标高，保证拱脚落在基岩上即可，大大减少了开挖量，降低了对坡积体的施工扰动，节省了边、仰坡防护的工程量，能降低施工成本，缩短施工周期。
Reverse tunnel entering construction method for tunnel special-shaped protection arch on slope accumulation body
一种坡积体上隧道异形护拱逆做进洞施工方法
ZHANG CONGXU (author) / DONG JIANZHAO (author) / LIU YONGSONG (author) / ZHANG RUYUAN (author)
2020-10-02
Patent
Electronic Resource
Chinese
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