A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Supporting structure for tunnel excavation in upper-soft and lower-hard stratum arch cover method and construction method
The invention discloses an upper-soft lower-hard stratum arch cover method tunnel excavation supporting structure which comprises a forepoling located on the outer side of an arch cover, a tunnel secondary lining and an arch cover primary support arranged above the tunnel secondary lining, and arch springing longitudinal beams are arranged at arch springing positions on the left side and the right side of the arch cover primary support. The inner sides of the arch foot longitudinal beams are supported by steel pipe piles, and the outer sides are fixed by feet-lock bolts. The forepoling comprises a large pipe shed, and a small guide pipe reinforcing structure, a freezing hole, a temperature measuring hole, a temperature control hole and a pressure relief hole which are positioned on the outer side of the large pipe shed. The invention further discloses a construction method of the supporting structure. According to the method, grouting, freezing and pipe shed combined advanced support is adopted to enhance the strength of the upper layer surrounding rock, and enough safety reserve is provided for subsequent arch cover method excavation; the foot-lock bolts, the arch foot longitudinal beams and the steel pipe piles are combined to support the arch feet, so that the compressive strength of the arch feet is improved, and the arch feet can be prevented from being deformed and broken due to overlarge local pressure.
本发明公开了一种上软下硬地层拱盖法隧道开挖支护结构，包括位于拱盖外侧的超前支护、隧道二次衬砌以及布设在隧道二次衬砌上方的拱盖初期支护，在拱盖初期支护左右两侧的拱脚处设有拱脚纵向梁，拱脚纵向梁的内侧采用钢管桩支撑，外侧采用锁脚锚杆固定。超前支护包括大管棚以及位于大管棚外侧的小导管加固结构、冻结孔、测温孔、温控孔和泄压孔。本发明还公开了上述支护结构的施工方法。本发明采用注浆、冻结与管棚联合超前支护，来增强上层围岩的强度，为后续拱盖法开挖提供足够的安全储备；利用锁脚锚杆、拱脚纵向梁和钢管桩联合支护拱脚，提高了拱脚的抗压强度，可以防止因局部压力过大而造成的拱脚变形破碎。
Supporting structure for tunnel excavation in upper-soft and lower-hard stratum arch cover method and construction method
The invention discloses an upper-soft lower-hard stratum arch cover method tunnel excavation supporting structure which comprises a forepoling located on the outer side of an arch cover, a tunnel secondary lining and an arch cover primary support arranged above the tunnel secondary lining, and arch springing longitudinal beams are arranged at arch springing positions on the left side and the right side of the arch cover primary support. The inner sides of the arch foot longitudinal beams are supported by steel pipe piles, and the outer sides are fixed by feet-lock bolts. The forepoling comprises a large pipe shed, and a small guide pipe reinforcing structure, a freezing hole, a temperature measuring hole, a temperature control hole and a pressure relief hole which are positioned on the outer side of the large pipe shed. The invention further discloses a construction method of the supporting structure. According to the method, grouting, freezing and pipe shed combined advanced support is adopted to enhance the strength of the upper layer surrounding rock, and enough safety reserve is provided for subsequent arch cover method excavation; the foot-lock bolts, the arch foot longitudinal beams and the steel pipe piles are combined to support the arch feet, so that the compressive strength of the arch feet is improved, and the arch feet can be prevented from being deformed and broken due to overlarge local pressure.
本发明公开了一种上软下硬地层拱盖法隧道开挖支护结构，包括位于拱盖外侧的超前支护、隧道二次衬砌以及布设在隧道二次衬砌上方的拱盖初期支护，在拱盖初期支护左右两侧的拱脚处设有拱脚纵向梁，拱脚纵向梁的内侧采用钢管桩支撑，外侧采用锁脚锚杆固定。超前支护包括大管棚以及位于大管棚外侧的小导管加固结构、冻结孔、测温孔、温控孔和泄压孔。本发明还公开了上述支护结构的施工方法。本发明采用注浆、冻结与管棚联合超前支护，来增强上层围岩的强度，为后续拱盖法开挖提供足够的安全储备；利用锁脚锚杆、拱脚纵向梁和钢管桩联合支护拱脚，提高了拱脚的抗压强度，可以防止因局部压力过大而造成的拱脚变形破碎。
Supporting structure for tunnel excavation in upper-soft and lower-hard stratum arch cover method and construction method
一种上软下硬地层拱盖法隧道开挖支护结构及施工方法
WU LIMIN (author) / YUAN RUOLIN (author) / WANG LEI (author) / WU HONGBIN (author) / JIANG XINQIANG (author) / YAN YUE (author) / FU DENGFENG (author) / LUO JIAO (author) / ZHU NAN (author) / GUO XIAOLONG (author)
2024-03-26
Patent
Electronic Resource
Chinese
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