Shield construction method for clearing obstacles by punching rock stratum section

Abstract

The invention relates to a shield construction method for clearing obstacles by punching a rock stratum section, comprising the following steps of: at first, determining a punching obstacle-clearing construction area as full-section punching construction; lapping at a pile hole position, wherein a bottom elevation of a pile is lower than a bottom elevation of a shield tunnel; determining a last-stage punching pile width range according to a probing result; carrying out punching obstacle-clearing construction by using a drilling construction process of a punching and filling pile; and directly injecting rapid-rigid slurry to fill an underground guide pipe after clearing the obstacles by punching. The obstacle-clearing construction method of a punching pile machine provided by the invention has the advantages of simple equipment, low manufacturing price, high security, rapid construction, smaller environment influence and the like, provides a novel treatment means for meeting the obstacles in underground engineering, such as shield, pipe-jacking and the like, and has a wide application prospect.

Description

technical field [0001] The invention relates to a method for removing obstacles such as rock formations, pile bodies, reinforcement bodies and the like during the construction of shield tunneling and pipe jacking on soft soil. Background technique [0002] Shield tunneling and pipe jacking often encounter obstacles such as rock formations, piles, and reinforcements during soft soil construction. Such situations are often not found in the previous geological survey, and obstacles need to be removed during the construction process to ensure the smooth completion of the excavation. After years of development, the construction techniques of obstacle removal include: ① Use the air pressure method or freezing method to assist the soil in the obstacle area, and then enter the soil bin from the front of the tool head to clear the obstacle; ② Backfill after excavation and obstacle removal; ③ Shield and roof The pipe tool head cutter is improved and replaced and then cut directly, ④ t...

AI Technical Summary

Problems solved by technology

The distance between the actual proven rock formation and the tunnel junction is greater than the original design tunnel length and 45 meters, and the original construction plan cannot be constructed normally.

[0006] If the barrier-clearing construction is not adopted, the original design and manufactured shield machine will be transformed, or the cost of replacing the shield machine will be extremely high, the economic loss will be large, and the progress will need to be extended by more than one year; Drilling method) The construction risk on the seabed is extremely high, and the construction period and cost are also very high;

[0007] However, if the full-rotary rotary drilling rig commonly used in engineering is used for the construction of obstacles, the on-site investigation shows that the construction site in the beach area outside the steel sheet pile is difficult to meet the site requirements of the equipment and the 120T crane that matches it; and the equipment works The shift fee is high, and it is impossible to arrange multiple sets for simultaneous construction, resulting in a long construction period and high costs

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