Yunnan 25 manufacturers of high quality hollow bolt grouting hollow bolt where to find? Luoyang River Thailand Technology hollow bolt, supporting choice! Select Jiang Tai, is to choose safe! Luoyang River Thai Technology Co., Ltd - hollow bolt manufacturer - sincerely look forward to your call, ensure quality and cheap. Grouting hollow bolt technology is mainly used in the geological conditions of the surrounding rock moderately good support system. 1) Drilling: Drilling and ordinary rock drill hole cleaning. 2) Insert the bolt: the installed anchor head hollow grouting anchor insertion holes. 3) Install slurry stopper, plate and nut: rock conditions according to the exhaust pipe installation. 4) Connect grouting machine: The end of the bolt and grouting will connect the selected grouting. 5) Grouting: Grouting start the machine, such as the need for improved pressure grouting surrounding rock structure, the need to be raised to the design pressure gauge pointer can. General Specifications 25,28,32mm hollow bolt