Device and method for adjusting tunnel support force

A tunnel supporting force adjusting method, comprising the following specific steps:

• step 1:
• arranging a plurality of connecting assemblies on the I-steel at equal intervals;
• step 2:
• placing an assembling unit composed of an I-shaped steel and the connecting assemblies behind the rock of a tunnel, adjusting the position of the I-shaped steel to the top of the connecting assemblies to withstand a rock, and connecting the assembling unit with the rock of the tunnel, wherein a portion of the bottom of the connecting assemblies is reserved in the air;
• step 3:
• connecting a jack and a jack stand to the bottom of the connecting assemblies, wherein the jack provides a jacking force for the connecting assemblies;
• step 4:
• starting the jack to drive internal force transmission tubes of the connecting assemblies to move up and down in hollow casing pipes of the connecting assemblies, and adjusting the state of the connecting assemblies to adjust the magnitude of the supporting force on the tunnel;
• step 5:
• limiting and fixing the adjusted connecting assemblies;
• step 6:
• removing the jack and the jack stand, grouting the internal force transmission tubes and the hollow casing pipes, filling the gap between the connecting assemblies and the upper surface of I-shaped steel after adjusting the supporting force, and grouting and filling the internal force transmission tubes and the hollow casing pipes.