A Judgment Method for the Positional Relationship Between the Shield Tail and the Segments of Large-diameter Shield TBMs

Abstract

The invention provides a method for judging the positional relationship between the shield tail and the segment of a large-diameter shield. In the early stage of construction, according to the design drawing of the shield machine manufacturer, the stroke of the propulsion cylinder and the hinge stroke of the selected four points are calculated through the spatial geometric relationship. Calculation formula, further calculate the vertical position relationship formula between the segment and the shield tail according to the calculation formula of the stroke of the propulsion cylinder and the stroke of the hinge cylinder; establish an EXCEL table, and calculate the stroke of the push cylinder, the stroke of the hinge cylinder, and the stroke of the push cylinder and the hinge cylinder of each partition The stroke calculation formula and the judgment formula for the positional relationship between the segment and the shield tail are input into the form, and then imported into the upper computer of the shield machine to judge the positional relationship between the shield tail and the segment. The invention optimizes the basis for judging the type selection of the segments, and helps to improve the tunnel forming quality and construction efficiency.

Description

technical field [0001] The invention belongs to the technical field of tunnel construction, and in particular relates to a method for determining the positional relationship between a shield tail and a segment when a shield tunneling method is used for subway tunnel construction. Background technique [0002] Segment selection for shield tunneling is an important link in the construction of shield-tunneled subway tunnels. The quality of segment selection directly affects the posture adjustment of shield tunneling and the assembly quality of segments. The existing segment selection method is mainly based on the following data: (1) stroke difference of propulsion cylinder in each zone of shield machine; (2) shield tail clearance; (3) attitude of shield machine; (4) stroke of hinged cylinder in each zone Difference. Through the comparison of the above data, determine the segment trend, posture, position relationship with the shield tail, and fit with the trend of the shield ma...

AI Technical Summary

Problems solved by technology

[0003] With the continuous development of urban rail transit, the excavation diameter of the shield machine is also increasing, and the number of partitions of the propulsion cylinder of the shield machine is increasing. As a result, the position of the stroke sensor of the propulsion cylinder of each partition does not correspond to the stroke sensor of the hinged cylinder, resulting in the segment selection. Errors or even errors occurred in the judgment of the positional relationship between the segment and the shield tail, which eventually led to unreasonable selection of the segment, resulting in misalignment and damage of the segment during the excavation process, and even failure to assemble the segment due to the small gap between the shield tail

According to the corresponding normative requirements of urban rail transit, it is necessary to analyze the cause of the wrong platform and the segment with too large damaged area and shut it down, which greatly increases the construction cost and seriously affects the construction progress

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