在泰安的建筑工地，电梯门套安装如同给建筑的 “交通枢纽” 定制合身的 “精装外衣”，每一道工序都藏着讲究。从测量时的 “毫米级较真” 到安装后的 “无痕美颜”，施工人员用耐心与技巧，让石材、金属或木质板材在电梯门洞周围 “严丝合缝”，既撑起通行的 “面子”，更筑牢耐用的 “里子”。

　　At the construction site in Tai'an, the installation of elevator door frames is like customizing a fitted "fine decoration coat" for the "transportation hub" of the building, with every process hidden with attention to detail. From the "millimeter level accuracy" during measurement to the "seamless beauty" after installation, construction personnel use patience and skill to ensure that stone, metal, or wooden panels are tightly fitted around the elevator door opening, not only supporting the "face" of passage, but also building a durable "lining".

　　施工前的准备是 “打底功夫”。工人们先清点工具包：精度 1mm 的钢卷尺、误差 ±1mm/m 的红外线水平仪、带金刚石锯片的切割机必不可少，还有适配不同材料的胶粘剂 —— 石材用耐候胶、金属用结构胶、木质用环保胶，以及 M6×60mm 的膨胀螺丝等。材料进场前 “三查”：查材质（大理石需无裂纹、铝合金看喷涂厚度、实木复合板验防潮层）、查尺寸（按门洞实测高度 2200-2400mm 核对）、查外观（剔除色差大或缺角的板材）。若遇门洞墙体不平整（垂直度超 3mm 或平整度超 2mm），先用 1:2.5 水泥砂浆找平，养护 24 小时等干透再开工。

　　The preparation before construction is the 'foundation work'. The workers first counted the tool kit: a steel tape measure with an accuracy of 1mm, an infrared level with an error of ± 1mm/m, a cutting machine with diamond saw blades, and adhesives suitable for different materials - weather resistant adhesives for stone, structural adhesives for metal, environmentally friendly adhesives for wood, and M6 × 60mm expansion screws. Three checks before material entry: check the material (marble for cracks, aluminum alloy for spray thickness, solid wood composite board for moisture-proof layer), check the size (checked according to the measured height of the door opening from 2200-2400mm), and check the appearance (excluding boards with large color differences or missing corners). If the door opening wall is uneven (verticality exceeding 3mm or flatness exceeding 2mm), first use 1:2.5 cement mortar to level it, cure for 24 hours, and wait for it to dry before starting work.

　　测量放线堪称 “定海神针”。施工人员从地面沿墙垂直向上，用钢卷尺在门洞两侧标出门套顶部水平线，再用红外线水平仪 “扫平”，确保两侧高度差不超 2mm。测宽度时在门洞上、中、下各量一次，取平均值算出门套单边宽度（如门洞宽 1100mm，则单边 550mm）。为保证垂直，用铅垂线从顶部吊下，在地面画出入墙 50mm 的基准线，左右对称标好，像给门洞画了个 “田字格”。石材门套还需提前规划拼接缝位置，避开视线中心，在墙体标记预埋挂件点（间距≤600mm，距边≥150mm），为后续固定打基础。

　　Measuring and laying out can be called the 'sea fixing needle'. The construction personnel mark the horizontal line of the top of the door frame vertically upward along the wall from the ground, using a steel tape measure on both sides of the door opening, and then use an infrared level to "level" to ensure that the height difference between the two sides does not exceed 2mm. When measuring the width, they measure the top, middle, and bottom of the door opening once each, and take the average to calculate the width of one side of the door frame (if the door opening is 1100mm wide, then 550mm on one side). To ensure verticality, hang a plumb line from the top and draw a 50mm reference line for the entrance and exit walls on the ground. Mark it symmetrically on both sides, as if drawing a "field grid" for the door opening. Stone door frames also need to plan the joint positions in advance, avoiding the center of the line of sight. Pre embedded hanging points should be marked on the wall (spacing ≤ 600mm, distance from the edge ≥ 150mm) to lay the foundation for subsequent fixation.

　　材料加工讲究 “因材施艺”。石材用桥式切割机按线切割（误差≤1mm），切口用角磨机倒 45° 小角（深 2-3mm）防崩裂，再用 300 目砂轮片打磨光滑；铝合金板用数控切割机下料，修边器处理毛边至无刺手；木质复合板用推台锯精准切割，切口刷防潮封边漆。加工好的板材按 “左、右、上” 编号，背面用油性笔标注尺寸，堆放在离地 10cm 的木方上，防受潮变形。石材拼接前在地面 “试装”，调平缝宽至 2-3mm，用记号笔标记对应位置，避免安装时出错。

　　Material processing emphasizes the principle of "applying art according to the material". Stone is cut by a bridge type cutting machine according to the line (error ≤ 1mm), and the cut is made by using an angle grinder to invert a small angle of 45 ° (2-3mm deep) to prevent cracking, and then polished smooth with a 300 mesh grinding wheel; Aluminum alloy plates are cut using a CNC cutting machine, and edge trimmers are used to remove burrs until there are no burrs; The wooden composite board is precisely cut with a push table saw, and the cut is coated with moisture-proof edge sealing paint. The processed boards are numbered "left, right, top", and the back is marked with an oil pen to indicate the size. They are stacked on a wooden square 10cm above the ground to prevent moisture and deformation. Before splicing the stone, conduct a trial installation on the ground, adjust the joint width to 2-3mm, and mark the corresponding position with a marker pen to avoid errors during installation.

　　安装固定是 “体力 + 技术” 活。石材门套先在标记点钻孔（深 60mm），植入膨胀螺丝固定 L 型不锈钢挂件（厚 3mm），用垫片调平挂件表面至基准线。板材背面抹 5-8mm 厚石材胶，对准挂件贴合，轻敲使胶层均匀，用水平尺校垂直度（偏差≤2mm），底部和两侧塞木楔临时固定。金属门套则先装 U 型卡槽（间距 400mm），卡入金属板后用自攻螺丝固定（间距 300mm），螺丝帽盖同色盖帽。木质门套需先钉 18mm 多层板基层（膨胀螺丝间距 500mm），再涂结构胶贴饰面板，边缘用蚊钉（间距 100mm）加固，钉眼批腻子补平。上门套板由两人抬放，用 4mm 厚角码与两侧板连接，确保顶部水平、接缝紧密。

　　Installing and fixing is a combination of physical and technical labor. Drill holes (60mm deep) at the marked points for the stone door frame, insert expansion screws to fix the L-shaped stainless steel pendant (3mm thick), and use washers to level the surface of the pendant to the reference line. Apply 5-8mm thick stone adhesive on the back of the board, align it with the pendant, tap lightly to make the adhesive layer uniform, use a level ruler to calibrate the verticality (deviation ≤ 2mm), and temporarily fix the bottom and both sides with wooden wedges. The metal door frame is first installed with U-shaped card slots (spaced 400mm apart), and then fixed with self tapping screws (spaced 300mm apart) after being inserted into the metal plate. The screw cap is covered with a colored cap. Wooden door frames need to be nailed with 18mm multi-layer board base (expansion screw spacing 500mm) first, and then coated with structural adhesive to decorate the panel. The edges should be reinforced with mosquito nails (spacing 100mm), and the nail holes should be filled with putty. The upper door cover board is lifted and placed by two people, and connected to the two side boards with 4mm thick corner brackets to ensure that the top is horizontal and the joints are tight.

　　缝隙处理是 “美颜关键”。石材缝用同色耐候胶填充，高于表面 2mm，固化后用刀片刮平，再用 3000 目砂纸抛光至 “隐形”；金属缝打中性硅酮胶，刮胶板修出 1mm 深凹缝，防积灰；木质缝若留 5mm 工艺缝，清灰后刷同色面漆，密拼缝则用木胶填实。门套与墙体间 5-10mm 的空隙，用发泡胶填满，4 小时后修平，表面打密封胶防水。整个过程像给门套 “化妆”，让缝隙成为看不见的 “细节”。

　　Gap treatment is the key to beauty. Fill the stone joints with weather resistant adhesive of the same color, 2mm above the surface. After curing, scrape flat with a blade and polish with 3000 grit sandpaper until "invisible"; Apply neutral silicone adhesive to the metal seam, and create a 1mm deep concave seam with a scraping board to prevent dust accumulation; If a 5mm process joint is left in the wooden joint, it should be cleaned and coated with the same color paint, and the tight joint should be filled with wood glue. Fill the gap of 5-10mm between the door frame and the wall with foam adhesive, level it after 4 hours, and apply sealant to the surface for waterproofing. The whole process is like applying makeup to the door frame, making the gaps invisible details.

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