Method of treating tunnel collapse with roof-contacted shield support

A method of treating tunnel collapse with a roof-contacted shield support, comprising the following steps:

• at step 1, fixedly mounting a column, a fixed support column, a movable support column, a transverse canopy and a longitudinal canopy on a shield plate to form a combined support, wherein an upper connection plate of the movable support column is fixed on an upper surface of the shield plate;
• at step 2, leveling gravels below a collapse cavity to form an operation platform, and moving the combined support to be above the operation platform;
• at step 3, transporting a single hydraulic prop to the operation platform, erecting and lifting up the single hydraulic prop to fit each single hydraulic prop with the transverse canopy or the longitudinal canopy;
• at step 4, continuing lifting up the single hydraulic prop to enable heights of the transverse canopy, the longitudinal canopy, the shield plate and a guide pipe to be greater than a mounting height of an initial supporting arch;
• after the fixed support column contacts a surface of the collapse cavity, slowly increasing a bearing capacity of the single hydraulic prop to a rated working resistance, and then, locking a liquid supply valve;
• at step 5, disposing a single hydraulic prop below the movable support column to fit a top cover of the single hydraulic prop with a lower connection plate of the movable support column, so as to continue lifting up the single hydraulic prop below the movable support column;
• after the upper connection plate of the movable support column contacts the surface of the collapse cavity, slowly increasing a bearing capacity of the single hydraulic prop to the a rated working resistance, and then, locking a liquid supply valve;
• at step 6, erecting the initial supporting arch below the shield plate, and then connecting the initial supporting arches to form an initial supporting shed;
• at step 7, fixing intersection points of the initial supporting arch and the column/the movable support column by welding, and cutting off the parts of the column and the movable support column within a contour of the initial supporting arch;
• at step 8, after the single hydraulic props are removed, inserting a filling material pumping pipe into a reserved concrete hole of the shield plate, inserting an exhaust pipe into a reserved air hole, and hanging a metal net on the initial supporting arch;
• and
• at step 9, spraying fast-setting concrete to the initial supporting arch, injecting a filling material into the collapse cavity through the filling material pumping pipe, and discharging air in the collapse cavity through the exhaust pipe until the collapse cavity is filled up with the filling material.