Steel Mine Supports made of steel bars or steel sections, steel pipes, steel rails, etc.. The steel frame is often connected with steel bars or anchor pipes, and attached with reinforcing steel mesh, which works together after spraying concrete to stabilise the surrounding rock structure. It is suitable for the support of lattice steel frame and section steel frame in the peripheral rock section of IV, V, VI level of the Tunnel Roof Support main line and subsidiary tunnels, as well as the construction of reinforcing mesh support in the peripheral rock section of all levels.
When the steel reinforcement bar enters the field, test pieces shall be taken according to the batch for mechanical properties (yield strength, tensile strength and elongation) and process performance (cold bending) test, and its quality shall comply with the current national standard "hot rolled light round steel bar for reinforced concrete" (GB13013) and other provisions and design requirements.
Inspection quantity: with the same brand, the same furnace tank number, the same specification, the same delivery status of the steel bar, every 60t for a batch, less than 60 t also according to a batch. Construction unit sampling test once per batch. Supervision unit witness sampling test or parallel inspection, the number of sampling for the construction unit sampling 20% or 10%, but at least once.
Inspection method: the construction unit checks the quality documents of each batch and carries out relevant performance tests. Supervision unit checks all the quality documents and test reports, and conducts witness sampling test or parallel inspection.
The type, specification and performance of Steel Arch Support used in reinforcing mesh shall comply with the design requirements and relevant technical standards of the country and industry.
Inspection quantity: construction unit, supervision unit all check. Inspection method: observation, steel ruler inspection. The production of reinforcing steel mesh shall meet the design requirements. Inspection Quantity: All inspections by construction unit. Inspection method: observation, ruler measurement.
Reinforcing Steel Mine Support mesh shall be compatible with the shape of tunnel section and firmly connected with anchors or other fixing devices. Inspection Quantity: one inspection for each batch of construction unit. Inspection method: observation. Reinforcement mesh should be hung after spraying one layer of concrete. When double-layer reinforcing steel mesh is used, the second layer of reinforcing steel mesh shall be laid after the first layer of reinforcing steel mesh is covered by concrete and the concrete is finally set. Inspection quantity: one inspection for each batch of construction unit. Inspection method: observation, construction records. Reinforcing steel shall be used after cold drawing and straightening, and the surface of reinforcing steel shall not have cracks, oil stains, granular or flaky rust. Inspection quantity: one inspection per batch for construction unit. Inspection method: observation.
