29U type steel bracket

U steel is a kind of cross section shaped like the letter "U" English steel. U type steelall production of section shape, geometry parameters and the material is different, theU steel model China production mainly U18, U25, U29, U36 four. The U18 and U25 belong to U29, U36 belongs to the waist position; ear positioning. U18 due to bearing capacity is low, fewer production.

U steel has a high initial support force, support strength, simple installation, not easily deformed and other advantages, therefore, commonly used in the manufacture ofroadway yieldable metal, as mine, mine roadway two support, and through the tunnelsupporting etc.. U type steel telescopic bracket is mainly composed of the following parts:

The 1 top beams. The top beam for the circular arch, the tunnel section size, number of visual support force, transport conditions have 1 different section and multi sectionbranch.

2 legs. There are 3 kinds of column legs, an upper circular arc shape, the lower is straight; the second is all for the curve shape, and it has a radius of curvature; third isall for the curve shape, but there are two radius of curvature. Legs welded under thebase, the size of the base plate and as soft and hard;

The 3 connector. The connecting piece is clamped device bracket nodes and internodes, can play the function of connection between the two, can also be shaped steel joint part pressing connection, providing pre tightening force, the friction force between the steel with U, so as to ensure the arch support has definite working resistance and the shrinking.

4 tie. Rack rod is to enhance the role of the relative stability of the support, the support from the longitudinal connected, forming a whole.

5 backing material. The backing material is filled between the material U steel support and surrounding rock, aims to make U type steel support and surrounding rockcontact closely, improves the support the stress condition, improve its bearing capacity and maintain the stability of surrounding rock.

U type steel bracket must be reasonable in design and calculation, and when in useshould be reasonable, to ensure mine safety in production and improve economicbenefit.?ALB&0806&YRL