What are the six kinds of traditional roadway support? Urgent need to wait for high scores online

1. Single bolt support: this support method is generally adopted in roadway with short service life in thin seam gateway and good surrounding rock conditions. The bolt is backed by cement to increase the supporting area of the bolt. Our bureau promoted it more in 1976 and 1981. 2. Anchor porch full back bamboo basketry: it is mostly used in gateway and bamboo basketry support which is put into production immediately after excavation. Roof caving. At present, most mines have been converted to deep mining, and this support method is rarely used. 3. Metal mesh behind anchor rod: Because the strength of metal mesh is too high, the combined support structure with anchor rod can increase the strength of surrounding rock coal in roadway and reduce the displacement. It can effectively support the pressure of roof wall and prevent people from being injured by gangue. Now this support method is widely used and the effect is good. Support of supporting platform: When the width (flat roof) of the roadway in the mining area exceeds 3.2, because the rock beam is easily broken by tension from the middle of the roadway, it is necessary to add a frame support in the middle of the roadway. The roof strata are supported together with the anchor rod * * * to support the middle and lower layers of the thick seam. The frame support is made of No.11 I-beam as the top beam and equipped with friction pillars. When supporting, the two pillars leave the roadway with 3 on each side. Use the five-liter column lifter to rise synchronously, and the support will bear the pressure in the direction of the roof. 5. Anchor, back and net plus shotcrete support: it is used to seal the surrounding rock in the roadway with long service life, large ground pressure and acid water spraying, increase the support strength of the roadway, and resist the tensile deformation of the surrounding rock surface. It can also prevent the metal net from rusting and effectively support the hard wall of the roadway. 6. Anchor, back, Mesh and reinforcement support: used in composite roof and wide roadway, laying mesh around the roadway, pressing the mesh with a steel reed frame, and then compacting it with a cement backboard. Its effect is better than that of simple anchor and mesh support. The reinforcement frame is welded with 14 rebar, with a length of 2.4 and a width of .15, and the middle is made of short rebar. The two anchor rods with the top pulling against the two walls are connected into a whole with a ratio of 45.