Hollow self-feeding bolt is mainly used in excavation and support construction of fault fracture zone. It replaces ordinary mortar bolt under complex geological conditions, overcomes the difficult problems such as hole collapse, unable to insert rod and insufficient grouting, plays the role of bolt support, improves the bearing capacity of surrounding rock and ensures the overall stability of surrounding rock, and has good application value.
Features:
1. Self-feeding hollow grouting bolt adopts good thick-wall seamless steel pipe material, perfect and fast surface thread forming process and well-made accessories, which truly realizes the unity of self-drilling bolt drilling, grouting, anchoring and other functions.
2. There is a strong penetrating drill in front of the self-feeding hollow grouting bolt, which can easily penetrate all kinds of rocks under the action of general drilling machinery.
3, with continuous international standard waveform thread, can be used as a drill rod with the drill bit to complete drilling into the anchor hole.
4. The bolt body of the drill pipe does not need to be pulled out, and the air can be used as a grouting channel to carry out grouting from inside to outside.
5. The high-efficiency stop plug enables the grouting to maintain a strong grouting pressure, fully fill the void, and fix the broken rock mass. The high-strength backing plate and nut can evenly transfer the stress of the deep surrounding rock to the surrounding rock, so as to achieve the purpose of mutual support between the surrounding rock and the anchor rod.
6. Due to the trinity function of this kind of bolt, it can form anchor holes and ensure the anchoring and grouting effect without special techniques such as casing wall protection and pre-grouting during construction under various surrounding rock conditions.