空气绝缘桥架热浸镀锌的托盘桥架镀层表面应均匀，无毛刺、过烧、挂灰、伤痕、局部为镀锌等缺陷，不得有影响安装的锌瘤，螺纹的镀层应光滑；螺栓连接件应能拧入。喷涂桥架应平整、光滑、均匀、不起皮、无气泡水泡。桥架焊缝表面均匀，不得有漏焊、裂纹、夹渣、烧穿、弧坑等缺陷。 各类弯通及附件规格，应适合工程布置条件，并与托盘、梯架配套；支吊架规格选择，应按托盘、梯架规格配置，并应满足荷载的要求。根据施工图确定始端到终端位置，沿图纸标定走向，找好水平、垂直、弯通，用粉线袋或画线沿桥架走向在墙壁、顶棚、地面、梁、板、柱等处弹线或画线，并均匀档距画出支、吊、托架位置。

The surface of the hot-dip galvanized tray tray for air insulated cable trays should be uniform, without defects such as burrs, overburning, hanging dust, scratches, and localized galvanizing. There should be no zinc nodules that affect installation, and the coating of the threads should be smooth; The bolted connections should be able to be screwed in. The spray painted bridge should be flat, smooth, even, without peeling or bubbles. The surface of the welding seam on the bridge should be uniform and free of defects such as missed welding, cracks, slag inclusion, burning through, and arc pits. The specifications of various bends and accessories should be suitable for the engineering layout conditions and matched with pallets and ladders; The selection of support and hanger specifications should be based on the specifications of pallets and ladders, and should meet the requirements of the load. According to the construction drawings, determine the starting and ending positions, mark the direction along the drawings, find the horizontal, vertical, and curved sections, use a chalk bag or draw a line along the direction of the bridge, and mark the positions of supports, hangers, and brackets on walls, ceilings, floors, beams, slabs, columns, etc., and evenly span them.

1.空气绝缘桥架支吊架安装支架与吊架所用钢材应平直，无显著扭曲。下料后长短偏差应在3mm范围内，切口处应无卷边、毛刺。

1. The steel used for the installation of air insulated cable tray supports and hangers should be straight and without significant distortion. The length deviation after cutting should be within 3mm, and there should be no curled edges or burrs at the incision.

2.空气绝缘桥架钢支架与吊架应焊接牢固，无显著变形，焊接前厚度超过4mm的支架、铁件应打坡口，焊缝均匀平整，焊缝长度应符合要求，不得出现裂纹、咬边、气孔凹陷、漏焊等缺陷。

2. The steel bracket and hanger of the air insulated bridge should be welded firmly without significant deformation. Before welding, the bracket and iron parts with a thickness exceeding 4mm should be beveled, and the weld seam should be uniform and flat. The length of the weld seam should meet the requirements, and there should be no defects such as cracks, undercuts, air holes, depressions, and missed welding.

3.空气绝缘桥架根据支架承受的荷重，选择相应的膨胀螺栓及钻头；所选钻头长度应大于膨胀套管的长度，打孔的深度应以将套管全部埋入墙内或顶板内后为标准，表面平齐为宜。应先干净打好的孔洞内的碎屑，然后再用木锤将膨胀螺栓敲进洞内，应保证套管与建筑物表面平齐，螺栓端部外露，敲击时不得损伤螺栓的丝扣。埋好螺栓后，用螺母配上相应的垫圈将支架或吊架直接固定在金属膨胀螺栓上。

3. According to the load borne by the bracket, select the corresponding expansion bolts and drill bits for the air insulated bridge frame; The length of the selected drill bit should be greater than the length of the expansion sleeve, and the depth of drilling should be based on the standard of burying the sleeve completely into the wall or top plate, and the surface should be level. The debris inside the drilled hole should be cleaned first, and then the expansion bolt should be hammered into the hole with a wooden hammer. The sleeve should be flush with the surface of the building, and the bolt end should be exposed. The screw thread of the bolt should not be damaged during hammering. After burying the bolts, use nuts with corresponding washers to directly fix the bracket or hanger onto the metal expansion bolts.