Long tube hollow bolt factory direct price We are professional manufacturer of hollow bolt, sincerely look forward to your call, so that every customer 100% satisfaction is our eternal pursuit of service. Large-diameter pipe shed, shed 76, 108 bassoon shed, shed large diameter pipe tunnel roof structure of large diameter pipe roof made of high quality steel roll tied the whole thread-like rod, equipped with nuts, arched plate, pulp tampon and alloy drill constitution. Threaded bolt body: Length international standard waveform continuous thread, easy to install drill, link sets, tighten the nut; and can be cut and connected longer. Nuts: rock stress can concentrate delivered to the pad. Arch pad: can withstand greater stress surrounding rock. Pulp tampon: make grouting to maintain a certain pressure to sufficiently fill the void surrounding rock. Connected sets: the tube can shed while drilling extended to a depth of design. Alloy drill: a strong penetrating power, so that the tube can pass through all kinds of roof rock. We are professional manufacturer of hollow bolt, sincerely look forward to your call, so that every customer 100% satisfaction is our eternal pursuit of service. Large-diameter pipe shed range self-drilling large diameter pipe roof as an effective means of anchoring is extensively used in the tunnel advance support radial support, slope reinforcement, reinforcement and subgrade tunnel renovation project, the tunnel subgrade, slope and other projects are widely used, especially in engineering construction at weak broken rock conditions, to prevent tunnel collapse, rock deformation, to ensure the quality and safety of construction workers construction aspects of the construction team has become selected ideal construction method. Features 1. Large diameter pipe shed shed front end penetrating power tube alloy drill, drill rigs in the role, you can easily penetrate all types of rocks. 2. The pipe roof has a continuous thread of international standard waveforms with large loads to pull off by the high shear resistance, tangential shear force, anti-twisting forces and impact fracture toughness and other characteristics, can be used as drill with drill completion of drilling into the anchor hole. 3. As the body without the drill pipe shed aside, which can be used as grouting empty channel, grouting from the inside to the outside. 4. Efficient pulp can only plug so that the grouting grouting pressure to maintain a strong, fully fill the gap, consolidation broken rock. 5. High-strength plate, nuts can be delivered to the deep rock stress evenly hole On the walls surrounding rock, country rock and bolt achieve the purpose of supporting each other. 6. High intensity sets connected using self-drilling pipe roof while drilling has extended features, suitable for relatively small construction space, to achieve the design expertise of rock bolt reinforcement means. 7. Since the pipe roof Trinity features make it the construction of various types of rock conditions at the time, without casing Wall, pre-grouting and other special techniques can also be formed and to ensure that the anchor bolt holes and grouting effect.