Drainage Method of Long-distance Tunnel by Horizontal Directional Drilling

Abstract

The invention discloses a method for drainage of a long-distance tunnel through a horizontal directional drill. The method comprises the steps that: first, a first water-retaining wall is arranged close to the tunnel face of a flat guide outlet section, the lower part of the first water-retaining wall is not sealed and then forms a water outlet, surrounding rock is reinforced through anchor rods,a second water-retaining wall and a third water-retaining wall are arranged, drainage ditches are formed in the left side and the right side of a tunnel section between the first water-retaining walland the second water-retaining wall, and the left side and the right side of a transverse cave, and a drainage channel connected with a natural river ditch is constructed in an outlet of the transverse cave; second, site survey, site layout, guiding line design, and surveying and setting out are conducted; third, a drilling rig is in place and conducts test drilling; fourth, the drilling rig drills; and fifth, site clearing and recovery are quickly conducted. The method is special for quick drainage of special tunnels not suitable for drainage, wherein the tunnels are not penetrated, the length of a to-be-excavated section reaches 800 m or above, the daily water inflow is large, and residential areas or factories are located below outlets of the tunnels.

Description

technical field [0001] The invention belongs to the technical field of tunnel construction methods, and in particular relates to a water discharge method for long-distance tunnels by using horizontal directional drilling. Background technique [0002] Horizontal directional drilling rigs started in the late 1970s. With the continuous improvement and perfection of technology and equipment, they are moving toward large-scale, miniaturized, hard rock operations, mechanical automation (including self-contained anchoring systems, automatic stacking of drill pipes) and extraction, drill pipe connection automatic lubrication, anti-shock system and other automatic operation functions), ultra-depth guidance monitoring and other trend development. At present, directional drilling is mainly used in the laying of pipeline projects. Directional drilling is used to cross obstacles including highways, high-speed railways, large rivers, reservoirs, ponds, swamps, etc. It has the advantages ...

AI Technical Summary

Problems solved by technology

However, the excavation of the tunnel has not been completed, and the remaining 952m between the inclined shaft and the horizontal guide of the exit section has not yet been penetrated

The section to be excavated runs through the fault fracture zone 4, the main tunnel 1 is higher than the horizontal guide 2, and the main tunnel 1 and the horizontal guide 2 have a descending slope along the A direction, and the water in the excavated section of the tunnel has flooded to the inclined shaft 5 At the wellhead, the fixed pump station at 5 inclined shafts cannot be used for pumping and drainage

Images