U steel support (full name: the mine roadway support in hot rolled U steel) is a kind of like the English letter "U" cross section of the iron and steel, sometimes cross section in the shape of Japanese letters "ひ". Regarding the standard of u steel support, the latest standard in China was issued in 2008, and the national recommended standard GB/T 4697-2008 was implemented on April 1, 2009. The main function of U steel support is to make U steel arch for mine support.

Main features of u steel arch: high pressure, long support time, easy installation and deformation. Main application: it is mainly used for secondary support of mine roadway, mine roadway, and supporting support of tunnel through mountain.

As the main section steel for producing roadway compressible metal support, U steel support is widely used at home and abroad. However, due to the inconsistent understanding of the properties and requirements of u steel support itself, the section shape, geometric parameters and materials of u steel support in various countries are not the same.

The types of u steel support produced in China mainly include 18U, 25U, 29U and 36U. The first two products of the 1960s belong to waist positioning. The latter two are from the 1980s and belong to ear positioning. The U18 is seldom produced now because of its low carrying capacity. In GB/T 4697-2008, in addition to the above four types of u steel support, a new 40U model was added.

The single weight of each type of u steel support is as follows: 18UY 18.96 kg/m, 25UY 24.76 kg/m, 25U 24.95 kg/m, 29U 29 kg/m, 36U 35.87 kg/m, 40U 40.05 kg/m. The "Y" after the model represents waist positioning.Name of type U: cold bend U steel support, large size U steel, automobile U steel, hot dip galvanized U steel support, etc.

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