8 Bell-Less Top Equipments Installation
8.1 Brackets of Top Equipments
8.1.1 Before the installation，the brackets of the top equipments of the blast furnace shall be measured according to the center of the furnace top flange and the 4-core point of 0°，90°，180° and 270°，and arranged in the appropriate place of the furnace top platform or its nearby frame.
8.1.2 The brackets of the top equipments of the blast furnace should be lifted by the furnace top crane according to the specific conditions of the supply and installation site.The brackets may be lifted piece by piece or lifted after being grouped by two vertical columns and transverse beam on the ground into a slice.
8.1.3 The installation of the brackets of the top equipments of the blast furnace shall meet the following requirements:
1 The vertical column and the bottom plate connected with the upper support of the blast furnace shell should be welded on the installation site.
2 After lifting the vertical column or assembly part of the vertical column and the transverse beam in place，the distance from the center of the vertical column to that of the furnace shall be adjusted and measured，with the allowable deviation of±5mm.The inspection elevation and the mutual height difference of the vertical column shall be measured by level gauge or steel ruler，with the allowable deviation of±10.0mm and 3.0mm respectively.The length difference of two diagonal liens of the vertical column shall be checked by steel ruler，with the allowable deviation of 6.0mm.
3 The transverse beam and the platform beam shall be installed and their elevation and levelness shall be adjusted.The allowable deviation is±10.0mm and 2/1000 respectively.
8.1.4 When the brackets of the top charging equipment are subject to the connection of the high-strength bolt，the connection of the high-strength bolt shall meet the relevant requirements of Section 6.3 of this standard and the current national standard GB 50372 Code for Installation Acceptance of Metallurgical Machinery Ironmaking Equipment Engineering.
8.1.5 The welding of the bracket of the top equipment shall meet the following requirements:
1 The butt weld of the bracket of the top equipment shall meet the requirements of the design document.When there is no requirement in the design document，the inner quality level shall meet the requirements of the current national standard GB 11345 Method for Manual Ultrasonic Testing and Classification of Testing Results for Ferritic Steel Welds related to the ClassⅢof Category B，and the outer quality level shall meet the requirements of the current national standard GB 50205 Code for Acceptance of Construction Quality of Steel Structure s related to ClassⅡof the appearance quality.
2 The welding quality of the vertical column and the bottom plate shall meet the requirements of the design document.When there is no requirement in the design document，the relevant requirements of the current national standard GB 50205 Code for Acceptance of Construction Quality of Steel Structures related to ClassⅢ.