Arc plate reticulated shell supports

Product introduction of arc plate type reticulated shell bracket

Soft rock roadway support has been one of the key technical problems affecting the further development of China's coal industry.Due to the high compressive strength of deep mine, formation control is particularly difficult under the influence of mining and the impact of earth pressure. As a result, the support system is increasingly strengthened.The shotcrete support of anchor network should be reinforced with steel arch, or combined with anchor cable and surrounding rock grouting.Although this can achieve a certain support effect, but support cost is very high.Therefore, China coal group has designed and manufactured a new type of reticulated shell support. The main supporting features of this kind of reticulated shell support can be summarized as: "excavating and supporting at the same time, while supporting at the same time, with first soft and then rigid, sufficient rigidity, simple process and low price".

Arc plate type reticulated shell support roadway protection features

1. "digging and supporting", timely support.

After the support wall of arc plate type reticulated shell can be filled with gangue, grey bag, precast concrete slab, etc., so that the mesh frame and roadway contour can be quickly pasted, and the support side can be excavated and supported in time. On the one hand, the support resistance of the support can be brought into play in time, and the surrounding rock can be strengthened in time and work under the three-way stress state.On the other hand, it plays the role of gentle pressure and even pressure, so that the supports tend to have uniform force along the surrounding roadway and are in a good working state.

2. The arc plate type reticulated shell supports have sufficient "stiffness".

3. "allow moderation in softness" and "first softness, then firmness".

The stress of arc plate type reticulated shell supports has complicated components: rock mass expansion, creep, long-term strength reduction, and the reduction of the bond coefficient of broken rock mass, all of which are shown as the macroscopic displacement of rock mass.Therefore, the stability of roadway must be completed through the joint action of supports and surrounding rocks.The reticulated shell supports bear relatively large ground stress while acting on the surrounding rock, making the surrounding rock convergent under the support control. By supporting the side of the support, the crushed rock mass is continuously converging and compacted, forming a stable bearing ring, and bearing the ground stress together with the support.

The ductility of arc plate reticulated shell supports comes from two aspects:

(1) the steel grid frame in contact with surrounding rock has certain flexibility;

(2) the wood pad at the connection between the grid shell support plate and the plate.