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Vertical curve variable-slope section shield secant method launching construction method

A technology of vertical curve and secant line method, which is applied in the field of starting construction method of shield tunnel secant line method of vertical curve variable slope section, can solve the problems of shield tail stuck on segment, damaged hinge, damaged negative ring segment, etc. The effect of ensuring construction quality, ensuring construction safety, and preventing surface deformation

Inactive Publication Date: 2018-11-16
NO 4 ENG CO LTD OF CHINA RAILWAY NO 9 GRP +1
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Problems solved by technology

[0003] The secant starting construction method of the shield machine means that there is a vertical curve slope point in the starting section of the shield machine. Since the slope is always changing, and the shield machine is a complete rigid body on the starting frame, if it is forced to pass Hinge, oil cylinder pressure to adjust the attitude, it is very likely that the negative ring segment will be damaged, the shield tail will be stuck on the segment, and the hinge will be damaged

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  • Vertical curve variable-slope section shield secant method launching construction method
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Embodiment Construction

[0020] A kind of construction method starting from the secant method of the shield tunneling method in the vertical curve variable slope section, comprising the following steps:

[0021] 1) Since the downhill axis 1 of the design plan is a curve, and during the construction of the specific shield machine, the shield machine can only move forward in a straight line, so it is necessary to redesign the travel route of the shield machine, such as figure 1 Shown: From 1‰ downhill to 22‰ downhill, the secant line starts from slope change point 5, and the starting point is outside the starting bracket position 4, 10 meters into the steel ring of the portal A certain point at is the end point, and a straight line is drawn as the planned starting axis 2. The vertical distance between any point on the planned starting axis 2 and the planned downhill axis 1 of the Design Institute is less than or equal to ±50mm, and the downhill straight line is Qualified shield machine walking route; ch...

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Abstract

The invention relates to a vertical curve variable-slope section shield secant method launching construction method. The vertical curve variable-slope section shield secant method launching construction method comprises the following steps that (1) a qualified shield tunneling machine traveling straight line route is redesigned; (2) a launching frame and a reaction frame are mounted at a tunnel portal steel ring according to the designed shield tunneling machine traveling route, and a shield tunneling machine and a guiding system are mounted and debugged; (3) concrete in the tunnel portal steel ring is chiseled away, specifically, the tunnel portal chiseling sequence is from top to bottom and from inside to outside; (4) whether the shield attitude is consistent with the predicted launchingattitude or not is retested manually; (5) the number of negative ring segments is determined according to the structure of a launching shaft and the size of the shield tunneling machine; and (6) theperiphery of the tunnel portal is sealed, and shield tunneling is started. According to the vertical curve variable-slope section shield secant method launching construction method, a secant launchingtechnology is adopted to calculate the launching attitude of the shield tunneling machine and predicting the attitude of the shield tunneling machine entering a tunnel by ten meters, the shield tunneling machine meets the design requirements along a curve, and meanwhile, the construction efficiency is improved.

Description

technical field [0001] The invention relates to a secant-starting construction method of a shield tunneling method in a vertical curve changing slope section, which is suitable for the starting construction of a shield machine in a curved section, and is particularly suitable for the starting construction of a shield tunneling section in a vertical downhill section. Background technique [0002] In shield tunnel construction, when the shield body breaks away from the starting bracket during the initial tunneling stage, the shield machine will often get stuck or float up when the cutter head enters the reinforcement area, causing the central axis of the shield machine to deviate from the design plan line by more than 100%. limit. Therefore, the secant starting technology is widely used in the horizontal and vertical curve starting sections of the shield machine. [0003] The secant starting construction method of the shield machine means that there is a vertical curve slope ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D9/08
CPCE21D9/08
Inventor 王鹰刘丰林杨柳枝严仕舜王怀东佟方硕鲍飞翔李辉郭云鹏
Owner NO 4 ENG CO LTD OF CHINA RAILWAY NO 9 GRP
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