Lock foot technology of soft rock large deformation tunnel steel frame

A large-deformation, steel frame technology, applied in tunnels, tunnel linings, shaft linings, etc., can solve the problems of fragility, steel frames and anchor pipes that cannot be directly connected to lock feet, so as to avoid distortion, deformation and failure of lock feet , the effect of high economic benefit

Active Publication Date: 2017-05-31
CHANGAN UNIV
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Problems solved by technology

At present, the locking foot anchor tube has developed into an indispensable steel frame locking foot measure and is widely used, but there are still the following problems in the process of steel frame locking foot: the steel frame and the locking foot anchor tube cannot However, no matter what kind of welding process is used, the welding part has always been the most vulnerable part in the overall structure of the steel frame and the lock-foot anchor pipe

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  • Lock foot technology of soft rock large deformation tunnel steel frame

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Embodiment Construction

[0018] In order to make the object, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0019] The embodiment of the present invention provides a foot-locking process for the steel frame of a large deformation tunnel in soft rock, which includes the following steps:

[0020] (1) Selection of steel frame: Compared with section steel, circular steel tube concrete not only has superior mechanical properties, but also can avoid distortion and deformation of section steel frame due to insufficient strength and rigidity, and has higher economic benefits. More importantly, the circular CFST steel frame 1 (see figure 1 ) can be processed and manufactured to achieve a reliable connection w...

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Abstract

The invention relates to the technical field of tunnel support, in particular to a lock foot technology of a soft rock large deformation tunnel steel frame. According to the lock-foot technology, the reliability of connection between anchor pipes and the steel frame is strengthened, and failure of a lock foot of the steel frame is avoided. The technical scheme adopted by the invention comprises the following steps that (1) model selection of the steel frame is conducted, specifically, a circular steel pipe concrete steel frame is selected as the model selection of the soft rock large deformation tunnel steel frame; (2) machining and manufacturing are conducted, specifically, according to the design driving angles and the design outer diameter of the lock foot anchor pipes and the mounting position corresponding to the circular steel pipe concrete steel frame, preformed holes are drilled in the corresponding position of the circular steel pipe concrete steel frame, the sizes and positions of the preformed holes are required to be accurate, trial mounting of the lock foot anchor pipes is carried out on the processing site to guarantee successful mounting of the lock foot anchor pipes; and (3) on the tunnel construction site, after the circular steel pipe concrete steel frame is erected or lengthened or dropped into the bottom, the steel frame lock foot is constructed timely.

Description

[0001] 1. Technical field: [0002] The invention relates to the technical field of tunnel support, in particular to a foot-locking process for a large-deformation tunnel steel frame in soft rock. [0003] 2. Background technology: [0004] Steel frames can play an important role in maintaining the initial stability of tunnels in weak and broken ground after excavation. Whether the shaped steel frame can carry the load effectively depends to a large extent on whether its arch feet are stable. In order to ensure the stability of the foundation of the steel frame arch foot and the stability of the steel frame during the process of lengthening and landing, certain steel frame locking measures must be taken. At present, the locking foot anchor tube has developed into an indispensable steel frame locking foot measure and is widely used, but there are still the following problems in the process of steel frame locking foot: the steel frame and the locking foot anchor tube cannot How...

Claims

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Application Information

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IPC IPC(8): E21D11/18E21D20/02
CPCE21D11/18E21D20/02
Inventor 陈建勋陈丽俊黄沛刘钦罗彦斌
Owner CHANGAN UNIV
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