Refined rolled thread bar system is composed of refined rolled thread bar, coupler, hex nut, and flat plate, with characteristics of high strength, flexible construction, and wide application range. It can be used as soil nails, rock bolts, micropile, and other structures for slope support, dam reinforcement, mountain landslide control, foundation uplift control, etc. The refined rolled thread bar system construction requires several steps: drilling holes, installing bolts, nuts, and plates, grouting, and sealing holes. Grouting is the most important part of the whole construction process. It is a construction technique of injecting cement slurry or other slurries into water-bearing fractures, voids, or unstable strata through drilling holes to stop water or reinforce the stratum. Then what is its grouting method?

Refined rolled thread bar system contains an anchor section and a free section. Among them, the area wrapped by corrugated pipe is the anchoring section, and the interior of the anti-corrosion structure needs to be grouted. The area wrapped by smooth plastic pipe is a free section, and no grouting is required in the pipe.

Grouting method of anchoring section

1. Connect bottom end cap and corrugated pipes, and insert threaded rod and coupling sleeve into corrugated pipes.

2. Insert the grouting pipe and fill it with cement grout. After filling, screw the upper-end cap tightly.

3. Put thermoplastic tube on the connection between end cap and tube for heating.

Grouting method of threaded rod

1. Assemble the threaded rod and internal grouting solidification anti-corrosion system and put it into the hole.

2. Insert the exhaust pipe and the grouting pipe. Grouting pipe should reach the bottom of the hole, grouting method is pulling out the grouting pipe while grouting, and start the grouting pipe should be pulled out after grouting to 5m.

3. Use PO 42.5 ordinary Portland cement to prepare cement slurry, the water-cement ratio is controlled at 0.4-0.45, and the grouting pressure is controlled at 0.4-0.6Mpa until the orifice overflows. At this time, all the exhaust pipes should be pulled out and the grouting pipes should not be pulled out.

4. Use cement bag wet clay plus steel plate to seal and tightly plug, grout at 0.4-0.6Mpa stably for 5min, then pull out the grouting tube.

5. The grouting volume should be greater than 1.2 times its theoretical calculated volume.

6. After grouting, install the plate and nut.