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Combined forepoling construction method for unfavorable geology shallow buried section of tunnel
The invention discloses a tunnel unfavorable geology shallow buried section combined type advance support construction method. The tunnel unfavorable geology shallow buried section combined type advance support construction method comprises the following steps that a tunnel open cut tunnel section is excavated, cover arch concrete is poured, and advance large pipe shed construction is conducted; after advanced large pipe shed grouting is completed, ground surface grouting construction is carried out after coagulation is carried out for a preset duration; excavating and supporting construction of a shallow-buried section hole body is conducted, and excavation is conducted through an annular pilot tunnel core soil reserving method; a lap joint section with the length of 5 m is arranged at the tail end of the ultra-large pipe shed, and advance support construction of an advance small guide pipe and advance anchor rod combination is conducted from the starting point of the long lap joint section; and the advance support construction step of the combination of the advance small guide pipe and the advance anchor rod is circularly carried out until the tunnel unfavorable geological shallow buried section is penetrated. The combined forepoling construction method for the unfavorable geological shallow-buried section of the tunnel has the advantages that construction is safe and rapid, and the overbreak amount of the unfavorable geological shallow-buried section of the tunnel is small.
本发明公开一种隧道不良地质浅埋段组合式超前支护施工方法，隧道不良地质浅埋段组合式超前支护施工方法包括以下步骤：挖掘隧道明洞段，浇筑套拱混凝土并进行超前大管棚施工；超前大管棚注浆完成后待凝预设时长后进行地表注浆施工；进行浅埋段洞身开挖支护施工，采用环形导坑预留核心土法进行开挖；超大管棚末端设置5m长搭接段，自所述长搭接段的起点开始进行超前小导管和超前锚杆组合的超前支护施工；循环进行超前小导管和超前锚杆组合的超前支护施工步骤，直至穿过隧道不良地质浅埋段。本发明提供的隧道不良地质浅埋段组合式超前支护施工方法具备施工安全快速、隧道不良地质浅埋段超挖量小的优点。
Combined forepoling construction method for unfavorable geology shallow buried section of tunnel
The invention discloses a tunnel unfavorable geology shallow buried section combined type advance support construction method. The tunnel unfavorable geology shallow buried section combined type advance support construction method comprises the following steps that a tunnel open cut tunnel section is excavated, cover arch concrete is poured, and advance large pipe shed construction is conducted; after advanced large pipe shed grouting is completed, ground surface grouting construction is carried out after coagulation is carried out for a preset duration; excavating and supporting construction of a shallow-buried section hole body is conducted, and excavation is conducted through an annular pilot tunnel core soil reserving method; a lap joint section with the length of 5 m is arranged at the tail end of the ultra-large pipe shed, and advance support construction of an advance small guide pipe and advance anchor rod combination is conducted from the starting point of the long lap joint section; and the advance support construction step of the combination of the advance small guide pipe and the advance anchor rod is circularly carried out until the tunnel unfavorable geological shallow buried section is penetrated. The combined forepoling construction method for the unfavorable geological shallow-buried section of the tunnel has the advantages that construction is safe and rapid, and the overbreak amount of the unfavorable geological shallow-buried section of the tunnel is small.
本发明公开一种隧道不良地质浅埋段组合式超前支护施工方法，隧道不良地质浅埋段组合式超前支护施工方法包括以下步骤：挖掘隧道明洞段，浇筑套拱混凝土并进行超前大管棚施工；超前大管棚注浆完成后待凝预设时长后进行地表注浆施工；进行浅埋段洞身开挖支护施工，采用环形导坑预留核心土法进行开挖；超大管棚末端设置5m长搭接段，自所述长搭接段的起点开始进行超前小导管和超前锚杆组合的超前支护施工；循环进行超前小导管和超前锚杆组合的超前支护施工步骤，直至穿过隧道不良地质浅埋段。本发明提供的隧道不良地质浅埋段组合式超前支护施工方法具备施工安全快速、隧道不良地质浅埋段超挖量小的优点。
Combined forepoling construction method for unfavorable geology shallow buried section of tunnel
隧道不良地质浅埋段组合式超前支护施工方法
XI LONGHAI (author) / ZHAN HUYUE (author) / YANG ZUOBIN (author) / LU JI (author) / CHI FUDONG (author) / SHAO GUOHUI (author) / WANG YI (author) / REN YUQING (author) / NIE WEI (author) / CHEN WEI (author)
2024-09-27
Patent
Electronic Resource
Chinese
IPC:
E02D
FOUNDATIONS
,
Gründungen
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