Negative Pressure Air-seal Induced System for Controlling Environment of Pipe Jacking Operation

Abstract

Provided is a negative pressure air-seal induced system for controlling the environment of pipe jacking operation, including a turbulent airflow supply device provided at a certain distance from a tunnelling head and located in a tool pipe, wherein the turbulent airflow supply device forms an air curtain sealing structure at a certain angle with respect to the tunnelling head, the airflow rebounds and swirls between the air curtain and the tunnelling head to form an air turbulence vortex, so that the toxic and harmful gases are fully stirred and mixed to form a steady ascending airflow; and an exhaust device provided in the tool pipe, wherein a first air vent of the exhaust device is located between the tunnelling head and the turbulent airflow supply device to collect and receive the toxic and harmful gases, and a second air vent is located above ground to discharge the toxic and harmful gases off-site.

Dependencies are inferred from the claim text.