桥架外形尺寸允许偏差要求

　　Allowable deviation requirements for the external dimensions of the bridge frame

　　要求：

　　requirement:

　　① 桥架长度偏差：长度≤2m，极限偏差±2mm；长度＞2mm，极限偏差±4mm；

　　① Bridge length deviation: for lengths ≤ 2m, the limit deviation is ± 2mm; for lengths>2mm, the limit deviation is ± 4mm;

　　② 桥架宽度偏差：长度＞4mm，极限偏差±4mm；长 度≤4mm，极限偏差±3mm；

　　② Bridge width deviation: for lengths>4mm, the limit deviation is ± 4mm; for lengths ≤ 4mm, the limit deviation is ± 3mm;

　　③ 桥架尺寸及允许偏差应符合表2的规定：

　　③ The size and allowable deviation of the bridge frame shall comply with the provisions of Table 2:

　　要求：

　　requirement:

　　①热浸锌镀锌层厚度:平均值≥65微米，螺丝、螺帽、垫片≥20微米。附着力检查:划线、划格法试验，锌层应不剥 落凸起。

　　① Thickness of hot-dip galvanized layer: average value ≥ 65 microns, screws, nuts, and washers ≥ 20 microns. Adhesion inspection: Marking and grid method test, the zinc layer should not peel off or protrude.

　　② 电镀锌锌层厚度：≥12微米，螺丝、螺帽、垫片≥6微米， ?锌层附着力检查:划线、划格法试验，锌层应不剥落凸起。 喷塑层表面厚度≥50微米，防火层表面厚度≥200微米。

　　② Galvanized zinc layer thickness: ≥ 12 microns, screws, nuts, washers ≥ 6 microns, zinc layer adhesion inspection: marking and grid method test, zinc layer should not peel off or protrude. The surface thickness of the spray coating is ≥ 50 microns, and the surface thickness of the fireproof layer is ≥ 200 microns.

　　③ 检查方法:在每一节桥架上少有10个合理分配的测点， ?每个测点在部件的，用磁性测厚仪测量。

　　③ Inspection method: There should be at least 10 reasonably allocated measuring points on each section of the bridge, with each measuring point located in the center of the component, and measured using a magnetic thickness gauge.

　　要求：①桥架表面平整度允许误差：热浸锌桥架平面度允许误 差每米不大于8mm；电镀锌和喷漆桥架平面度允许误差 每米不大于4mm；

　　Requirement: ① Allowable error for flatness of bridge surface: The allowable error for flatness of hot-dip galvanized bridge shall not exceed 8mm per meter; the allowable error for flatness of electroplated and painted bridge shall not exceed 4mm per meter;

　　②槽架厚度：400mm～800mm桥架，板料厚度应为 2.0mm；小于400mm桥架板料厚度应为1.5mm；大于800mm，桥架板料厚度应为2.5mm；

　　② Thickness of the tray frame: 400mm to 800mm for the bridge frame, the thickness of the plate material should be 2.0mm; for the bridge frame less than 400mm, the thickness of the plate material should be 1.5mm; for the bridge frame greater than 800mm, the thickness of the plate material should be 2.5mm;

　　要求：角钢外观质量：① 镀层表面应均匀，无毛刺、过烧、挂灰、伤痕、局部 未镀锌、锈蚀、氧化等；

　　Requirement: Appearance quality of angle steel: ① The coating surface should be uniform, without burrs, overburning, dust hanging, scars, partial non galvanization, rust, oxidation, etc;

　　② 角钢的表面不得有分层、结疤、裂缝等；

　　② The surface of angle steel shall not have delamination, scars, cracks, etc;

　　③ 角钢几何弯曲度、边宽、边厚、顶角、理论重量等应 符合要求，角钢不得有显著的扭转、弯曲。偏差的允 许范围内。④ 角钢厚度允许偏差：±0.4；宽度允许偏差：±0.8，角 度允许偏差≤b／100，（b=角钢宽度）。

　　③ The geometric curvature, edge width, edge thickness, top angle, theoretical weight, etc. of the angle steel should meet the requirements, and the angle steel should not have significant torsion or bending. Within the allowable range of deviation. ④ Allowable deviation of angle steel thickness: ± 0.4; Allowable width deviation: ± 0.8, allowable angle deviation ≤ b/100, (b=angle steel width).

　　要求：

　　requirement:

　　① 膨胀螺栓的及样品必须经过项目主责工程师确认，到场实物与 样品一致，并提供产品合格证明资料，

　　① The brand and sample of the expansion bolt must be confirmed by the project chief engineer, and the physical object on site must be consistent with the sample, and product qualification certification materials must be provided,

　　② 长距离管线必须使用激光水准仪进行吊点定位，

　　② Long distance pipelines must be positioned using a laser level for hanging points,

　　③ 每次批量安装膨胀螺栓打孔之前，应先做钻头规格适配试验，经适 配试验合格后方可批量打孔。在更换钻头和使用不同批次材料时， 应重新做适配试验。

　　③ Before each batch installation of expansion bolts for drilling, a drill bit specification adaptation test should be conducted first. Only after passing the adaptation test can batch drilling be carried out. When replacing drill bits and using different batches of materials, a new adaptation test should be conducted.

　　④ 根据膨胀螺栓长度需要的钻孔深度，一般比膨胀管的长度深5毫米 左右，在电锤上设置限位。

　　④ According to the required drilling depth for the expansion bolt length, it is generally about 5 millimeters deeper than the length of the expansion pipe, and a limit is set on the electric hammer.

　　⑤ 打孔时电锤应垂直用力，不要摆动，防止孔洞直径偏大，而造成膨 胀螺丝锚固不牢。

　　⑤ When drilling holes, the electric hammer should be used vertically and not swung to prevent the hole diameter from being too large, which may cause the expansion screw to anchor loosely.

　　⑥ 膨胀螺栓锚固位置与混凝土结构边缘间距应大于3.5倍孔深，膨胀 螺栓之间间距也应满足同样要求。

　　⑥ The distance between the anchorage position of the expansion bolt and the edge of the concrete structure should be greater than 3.5 times the depth of the hole, and the distance between the expansion bolts should also meet the same requirements.

　　⑦ 膨胀螺栓安装后套管不应外露、加垫片并将螺母紧固牢固，紧固螺 母时禁止采用手持长杆套筒紧固。

　　⑦ After the installation of expansion bolts, the sleeve should not be exposed, gaskets should be added, and nuts should be tightened firmly. When tightening nuts, it is forbidden to use hand-held long rod sleeves for fastening.

　　拉拔试验要求：

　　Requirements for pull-out test:

　　① 拉拔试验仪器可显示试验拉力数据的电子测量仪，如条件不具 备，可选用能直观看出重量的重物作为测试块，试验承重支架离开 地面高度不超过200mm；

　　① The preferred pull-out test instrument is an electronic measuring instrument that can display test tensile data. If the conditions are not met, a heavy object that can visually show the weight can be selected as the test block, and the height of the test load-bearing bracket from the ground should not exceed 200mm;

　　②试验荷载应考虑施工人员在吊载物体上面作业的动荷载以及系统运 行中的震动疲劳载荷，以计算实际承载重量的2倍为基准，但不得 超过其极限抗拉力；

　　② The test load should consider the dynamic load of construction personnel working on suspended objects and the vibration fatigue load during system operation, based on twice the actual bearing weight, but not exceeding its ultimate tensile strength;

　　③试验前检查螺母安装是否紧固，用记号笔做好标记；

　　③ Before the experiment, check if the nut is securely installed and mark it with a marker pen;

　　④试验时对电子测试仪的读数进行拍照，作为依据；

　　④ Take photos of the readings of the electronic tester during the experiment as a basis;

　　⑤试验后检查紧固螺母位置是否有松动和旋转，膨胀螺栓是否有拉出 现象；

　　⑤ After the experiment, check whether the fastening nut position is loose and rotating, and whether the expansion bolt is pulled out;

　　⑥禁止采用吊篮上站人方法进行试验;

　　⑥ It is prohibited to use the method of standing on a suspended basket for testing;

　　⑦试验完成后填写部门提供的《膨胀螺栓拉拔试验报告》，并由相关 人员签字确认。

　　⑦ After the experiment is completed, fill in the "Expansion Bolt Pulling Test Report" provided by the department and have it signed and confirmed by relevant personnel.

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