The U steel arch support is a steel with a cross-sectional shape like the English letter "U". The U steel arch support produced by different countries have different cross-sectional shapes, geometric parameters and materials. Currently, U steel arch support produced in China mainly include U18, U25, U29 and U36. Among them, U18 and U25 are lumbar positioning; U29 and U36 are ear positioning. U18 is rarely produced due to its low carrying capacity.
U steel arch support has the advantages of high initial support force, large supporting strength, easy installation and no deformation. Therefore, it is often used to manufacture roadway shrinkable metal brackets, as secondary support for mine roadways, mine roadways, and support branches for tunnels. Protection and other purposes.
The use of U steel arch support effectively reduces the occurrence of accidents such as roofing and sheeting, is safe and reliable, and improves the stability of the mine ventilation system. The U steel arch support is used to solve the problem of tunneling support.
U steel arch support structure
1. Top beam.
The top beam is arc-shaped, and its number is divided into one section and multiple sections depending on the section size of the roadway, the force of the bracket, and the transportation conditions.
2. Column legs.
There are three types of legs: one is a circular arc at the top and the straight segment at the lower part; the second is all curved and has only one radius of curvature; the third is all curved, but has two curvatures. radius. A base is welded under the column leg, and the size of the base depends on the hardness of the bottom plate;
3. Connector.
The connecting piece is a clamping device between the bracket section and the inter-section, which can be used for the connection between the joints, and can also press the two sections of the connected steel joints to provide a pre-tightening force, so that the U-shaped steel has frictional force, thereby ensuring The arched bracket has a certain working resistance and a certain amount of shrinkage.
4. Racks between shelves.
The role of the inter-rack tie rod is to enhance the overall relative stability of the bracket, and the brackets are coupled from the longitudinal direction to form a whole.
5. Backing material.
The backing material is a filling material between the U-shaped steel bracket and the surrounding rock, and the purpose is to make the U-shaped steel bracket close to the surrounding rock, improve the stress state of the bracket, improve its bearing capacity and maintain the stability of the surrounding rock.
