Device and method for grouting and water-blocking borehole correction in limestone section of subway tunnel in karst area

Abstract

The invention discloses a drilling deviation rectifying device and method for grouting and water plugging in a limestone section of a subway tunnel in the karst region. The drilling deviation rectifying device comprises a non-closed cylindrical sleeve body used for clamping a drill rod, locking devices and a plurality of rollers capable of rolling in the longitudinal directions, wherein the non-closed cylindrical sleeve body is composed of a plurality of rigid arc-shaped duct piece units which are hinged in the longitudinal direction, the head end of each duct piece unit and the tail end of the adjacent duct piece are disconnected, and at least a part of the inner wall of each arc-shaped duct piece is provided with an elastic cushion layer; each locking device is used for connecting the corresponding adjacent duct piece units at the position where the adjacent duct piece are disconnected of the cylindrical sleeve body, and can be used for realizing that the drill rod is tightly clampedby the cylindrical sleeve body in the locking state; each roller is arranged on the corresponding duct piece in the radial direction of the cylindrical sleeve body through a supporting seat, and theouter edges of the rollers are used for being tightly attached to the inner wall of a drilling hole. According to the drilling deviation rectifying device, the drill rod can be prevented from being bent, and the drilling hole can be straight; friction between the drill rod and the wall of the drilling hole can be avoided, slag removal in the drilling operation is not influenced; and the drilling deviation rectifying device is convenient and rapid to assemble, disassemble and operate.

Description

technical field [0001] The invention belongs to the field of geotechnical engineering drilling, and in particular relates to a device and method for correcting a grouting water blocking drilling hole in a limestone section of a subway tunnel in a karst area. Background technique [0002] During the construction of subway tunnels in cities in karst areas (such as Jinan, Quancheng), the problem of karst water treatment in limestone sections is often encountered. Karst water treatment is an extremely critical content in safe and efficient tunneling. Drilling holes in the karst area of ​​the limestone section to block the inrush water channel through pre-grouting is a commonly used method for karst water control. In addition, drilling, pumping and drainage, and burying of test instruments are often required during tunnel construction. Geological drill bits (three-core drill bits) are often used to make holes, which have the advantages of fast drilling and easy slag removal. How...

AI Technical Summary

Problems solved by technology

However, when drilling a long hole with a depth of more than 10 meters, the drill pipe is prone to deflection and bending under the action of its own gravity and the top thrust of the drilling rig, causing the drilling direction of the drill bit to deviate from the designed hole position, affecting the quality of the hole, and at the same time causing the drill pipe and the drill Severe extrusion and friction between the inner walls of the hole causes drilling difficulties and damages the drill pipe

like Figure 5-Figure 7 As shown, in the prior art, when the borehole is a short borehole, the drill pipe can be guaranteed to be straight; when the borehole is long, generally in the case of more than 10 meters, the drill pipe is under the action of its own gravity and the jacking force of the drilling rig. When the drilled hole is a long drilled hole and continues to drill after more than 10 meters, the drilled hole is easy to bend and deviates from the design hole line

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