Method for exploring and processing interior of boulder hole in front for shield method construction

Abstract

The invention discloses a method for exploring and processing the interior of a boulder hole in front for shield method construction. The method includes the following steps of advanced exploration hole drilling, boulder exploring and boulder processing. In the first step of advanced exploration hole drilling, a plurality of exploration holes are drilled in front of a cutterhead of a shield tunneling machine from back to front through a plurality of drilling channels distributed in the cutterhead of the shield tunneling machine. In the second step of boulder exploring, boulder exploring is performed through an ultrasonic detector and the multiple exploration holes with the following procedures, first, an ultrasonic transmitter and an ultrasonic receiver are installed; second, ultrasonic detection is performed, wherein the installed ultrasonic transmitter and the installed ultrasonic receiver are moved simultaneously from back to front or from front to back, and the strength of the stratum in each moving position is ultrasonically detected in the moving process. In the third step of boulder processing, boulders in front of the cutterhead of the shield tunneling machine are detonated. The method is simple in step, reasonable in design, convenient to achieve, good in using effect and capable of overcoming multiple defects existing in a boulder exploring method adopted in existing shield method construction.

Description

technical field [0001] The invention belongs to the technical field of shield tunneling, and in particular relates to a detection and processing method for a front boulder cave used in shield tunneling construction. Background technique [0002] The 21st century is an era of great development of tunnels and underground spaces. Shield tunneling construction is being used more and more in the development of underground spaces. However, the geological regions of our country vary greatly, and uniaxial saturation is often encountered in shield tunneling construction. Boulders with extremely high compressive strength seriously endanger the normal excavation construction of shield tunneling. The commonly used boulder detection method is: use drilling or geophysical prospecting methods to detect boulders on the surface, and then carry out targeted deep hole blasting. The detection pertinence of the existing boulder detection methods is not strong, the number of drilling holes is la...

AI Technical Summary

Problems solved by technology

In actual construction, the existing boulder detection methods mainly have the following defects and deficiencies: ①The number of detection holes (that is, drilling hole 2) is large, and it is difficult to realize full-section detection within the excavation range; ②If there is a building directly above the shield tunnel (Structure) buildings, it will not be possible to realize vertical detection outside the hole; ③The large detection hole needs to be filled in the later stage to prevent the slurry from emerging during shield tunneling; ④Drilling holes vertically when constructing in large rivers, rivers or seas Construction requires large-scale water surface equipment, which is costly and complicated; ⑤Once a boulder is found, if precise blasting is required, vertical drilling must be carried out from the ground, which is difficult to measure and locate, and will affect the blasting effect

Images