- DL5190.2-2012电力建设施工技术规范第2部分:锅炉机组(英文版)
- 中国电力企业联合会
- 486字
- 2021-03-31 18:27:00
4.2 Boiler Foundation Inspection,Lineation and Pad Iron Erection
4.2.1 Before starting the erection of boiler,the foundation shall be re-inspected according to the acceptance record,and the following requirements shall apply:
1 The foundation shall meet the requirement of the design and GB 50204 Code for Acceptance of Constructional Quality of Concrete Structures.
2 The allowable deviation of boiler foundation positioning axis and overall dimension are shown in Appendix F.
3 The allowable deviation of boiler foundation lineation is listed as follows:
1)The spacing between the columns:when the column spacing≤10m,±1mm.
when the column spacing>10m,±2mm.
2)The corresponding diagonal deviation of the column:when the diagonal line≤20m,5mm.
when the diagonal line>20m,8mm.
4 When the anchor bolts of steel structures are pre-embeded,the requirements to the locating plate are listed as follows:
1)The spacing deviation between columns:≤1/1000 of the spacing and≤5mm.
2)The corresponding diagonal deviation between columns:≤8mm.
4.2.2 The secondary grouting clearance between the foundation surface and column soleplate shall be no less than 50mm.The foundation surface shall be completely processed into the pockmarked face,and the locations of placing pad irons shall chip flatly.
4.2.3 When using pad irons during installation,pad irons shall meet the following requirements:
1 The surfaces of pad irons shall be flat.
2 There shall not exceed three pad irons in each group with the width between 80mm-200mm and the length longer 10mm than each side of the column soleplate,and the thick pad iron shall be placed in the lower layer.When the secondary grouting clearance is more than 100mm,it is allowed to pad the profile steel framework and add a group of adjustment pad irons.
3 The pad irons shall be arranged below the vertical supporting plates of the upright column bottom plates.The total pressure bearing area of pad irons below each upright column shall be calculated according to the design load of columns.The bearing pressure per unit area of pad irons shall not exceed 60% of the foundation design concrete strength grade.
4 There shall be no loosening for the erection of pad irons.The point welding of pad irons and coloum soleplates shall be firm before grouting.
4.2.4 When adopting anchor bolts with the adjustment nuts to support the coloum bottom plate structure,the following requirements shall apply:
1 The verticality and spacing of anchor bolts shall be checked to ensure that they shall meet the requirements of design drawings.
2 If there is any paint or grease for temporary protection when leaving the factory in the coloum bottom plate surfaces,it shall be cleaned completely before erection.
3 The force of adjustment nuts shall be even and adjustment nuts shall be locked according to the drawing requirements.