10.3　Installation of Steel Structure

10.3.1　When steel structure is connected in a bolt welding type，it shall be connected and fixed by using bolts and then，is welded，and after welding，the geometric size of the steel structure shall be checked and meet the requirements of design documents.

10.3.2　For the installation of steel structure，stand columns and the main beam of platform on the first layer shall be installed to form a frame，the geometric size of the frame is adjusted to meet the requirements of design documents，and then，the center beam and secondary beam are installed.

10.3.3　After the platform on the first layer is installed and adjusted，the installation size of walking structure shall be re-inspected and shall meet the requirements of the installation accuracy of walking structure.

10.3.4　For the welding of steel structure，main beam welds shall be welded，and the installation size of steel structure shall be re-inspected，and then，center beam and secondary beam are welded.

10.3.5　Connecting bolts for assembly shall be fastened，and shall be subjected to anti-loose welding.

10.3.6　The planeness of platform floor plate shall not be larger than 5.0mm，and obvious rebounding does not occur after treading.

10.3.7　The installation of steel structure of coke pusher shall be in compliance with the following requirements:

1　Difference of corresponding side lengths of rectangular frame is adjusted，and allowable deviation shall be 3.0mm；

2　The diagonal difference of rectangular frame is adjusted，and allowable deviation shall be 4.0mm；

3　The elevation of platform beam is adjusted，and allowable deviation shall be±15.0mm，and relative height difference of each point shall not be larger than 10.0mm；

4　The perpendicularity of stand columns is adjusted，and allowable deviation shall be 1/1000 of heights of stand columns.