with requirements of design and current national code. High strength bolt, nut and gaskets should have quality certificates, and which can be stored respectively as per specification preventing from corrosion and damage.
——钢材的外形尺寸应符合表1.3-1的规定。
Physical dimension of steel material should meet the data shown in the table 1.3-1.
钢材的外形尺寸要求（单位：mm）
序号 项 目 允许偏差△ 表1.3-1 图 例 △ 1 平面度 t >14时 ≤1.0 t 钢板局部 t≤14时 ≤1.5 1000 2 型材弯曲矢高 ≤L/1000且≤5.0 L △ △ 3 角钢肢的 垂直度 ≤b/100 L 4 槽钢翼板对腹板的垂直度 △≤b/80 工字钢、H型5 钢翼板对腹板的垂直度 ≤b/100且≤2.0 △
Physical dimension of steel material（Unit：mm）
Table 1.3-1
△No. Item Allowable deviation△ as t≤14, ≤1.5 as t >14, ≤1.0 Legend 1 Partial flatness of steel plate t 1000 Bow arrow height of section material for ≤L/1000,≤5.0 L 3 Verticality of angle steel ≤b/100 △△ △△2 △ 4 Verticality of web of channel flange ≤b/80 5 Verticality of web of I-beam and H profile steel for≤b/100, ≤2.0
1.3.4 钢结构制作工艺 Fabrication Process of Steel Structure
（1）钢材的矫形 Straightening of steel material
钢材使用前，进行外形尺寸检查，超差部分进行矫形，矫形后的外形尺寸应符合表要求3-1的要求。
Carrying out physical dimension inspection before using of steel materials, for out-of-tolerance parts, should adopt straightening operation, and physical dimensions after that shall meet data of table 4.1.
（2）放样、号料 Lofting and material drafting
放样采用钢结构设计软件实现，利用钢结构设计软件对节点图、大样图及构件图等车间制作大样图进行详细设计，保证放样的尺寸精度。根据大样图，在板材或型材上进行1：
△△1号料划线，作为下料依据。大部分零部件采用数控机床号料。
Lofting shall be performed by a design software of steel structure, and which also can be used for designing of the detail drawings of node diagram, detail drawing and structural drawing etc. prepared in the shop, at same time the accurate dimension should be ensured. Carry out the lofting with a rate of 1:1 on the plate or shape materials according to the detail drawing. A numerical control machine can be used for lofting of most of parts.
放样、号料应根据工艺要求预留制作安装时的焊接收缩余量及切割、刨边和铣平等加工余量。放样允许偏差应符合表1.3-2的要求，号料允许偏差应符合表1.3-3的要求。
The mechanical tolerance of welding contraction, cutting off, edge shaping and milling should be prepared for lofting and setting out according to process requirements. The allowable deviation of lofting shall meet the requirement of table 1.3-2 and which of material drafting will meet the requirement of table 1.3-3.
放样的允许偏差
项 目 平行线距离和分段尺寸 对角线差 宽度、长度 孔 距 角 度
号料的允许偏差
项 目 零件外形尺寸 孔 距
Allowable deviation of lofting
Item
Table 1.3-2
表1.3-3
表1.3-2
允 许 偏 差 ±0.5 mm 1.0 mm ±0.5 mm ±0.5 mm ±20′ 允 许 偏 差 ±1.0 mm ±0.5 mm Allowable deviation Distance of parallel lines and partition dimension Miss distance of diagonal line Width and length Hole distance Angle
±0.5 mm 1.0 mm ±0.5 mm ±0.5 mm ±20′ Allowable deviation of material drafting Item Physical dimension of parts Hole distance （3）下料 Cutting Off
Table 1.3-3
Allowable deviation ±1.0 mm ±0.5 mm 钢材的切割下料采用机械剪切（SHEAR Cutter）、火焰切割（GAS Cutter）和带锯切割（SAW Cutter）三种方法。
The cutting methods of steel material include three manners such as: SHEAR Cutter, GAS Cutter and SAW Cutter.
——厚度不大于12mm的钢板采用机械剪切，12mm厚度以上的钢板采用火焰切割。 The shear cutter will be adopted for the steel plate that thickness is not more than 12mm, if which over that of 12mm, the gas cutter shall be used.
——H型钢和其他大规格的型钢采用带锯切割，小规格型钢采用火焰切割。 The saw cutter is suitable for the cutting of H—shape steel and other large specification of steel, but small specification steel can adopt the gas cutter for cutting off.
——火焰切割尽可能使用数控切割机和自动切割机。
The numerical control cutting machine and automatic cutter shall be used as possible as can. 切割下料后零部件的外形尺寸应符合表1.3-4和表1.3-5的规定。
The physical dimensions of cut parts should meet data shown in the following table 1.3-4 and 1.3-5.
火焰切割的允许偏差
表1.3-4