门式脚手架除了结构稳定、承载力大的特点，在使用时必须增加一些构造措施，才能增强门架的支撑能力，这也是门式脚手架能够做到安全不倒的诀窍。高度在4.5 m以上的高支模在施工前必须由施工单位编制专项技术方案。技术方应包括模板及其支统的设计、搭设及拆除，混凝土浇筑方法，浇筑过程观测及安全控制要求等方面内容。没有编制技术方案的不得施工。此外，门式脚手架产品的轻型化使得它拆装方便，也就减轻了建筑工人的劳动强度，脚手架的设计趋向轻型化，选用内外源动性钢管，在生产环节的钢材耗材量比传统的钢管式脚手架节约40%以上。因此，在建筑施工拆装方面减轻了作业人员的劳动强度，使他们在作业中没 有那么累，精神状况也就相对好了，安全系数自然上升。
In addition to the characteristics of stable structure and large bearing capacity, some structural measures must be added to enhance the supporting capacity of the portal scaffolding. This is also the knack of the portal scaffolding to be safe. High formwork with a height of 4.5 m or more must be prepared by the construction unit before construction. The technical side should include the design, erection and demolition of formwork and its branches, concrete pouring method, observation of pouring process and safety control requirements. No construction shall be carried out without drawing up technical plans. In addition, the portal scaffolding product lightweight makes it easy to disassemble and assemble, which also reduces the labor intensity of construction workers. The design of scaffolding tends to be lightweight. The steel consumption in production link is more than 40% less than that of traditional steel tube scaffolding. Therefore, in the construction of disassembly and assembly to reduce the worker's labor intensity, so that they are not so tired in the operation, mental health is relatively good, the safety factor naturally rises.
门式脚手架安装有自己的标准，要整齐划一，并在相互垂直的两个方向上有保证其稳定的支撑系统，在搭设之前要在实地按设计要求严格放线。门架支撑安装时要求每安装一层门架就要加一道48 x 3.5钢管水平拉杆将其扣住。纵横向垂直 剪刀撑按间距小于6m布置。门式钢管脚手架支撑受力主要靠支撑架整体受力，要发挥这种整体效应，就要靠纵横向水平拉杆和纵横向垂直剪刀撑将各榀单薄的门架“捆绑” 连接起来。如果不设置纵横向水平拉杆和纵横向垂直剪刀撑，就好像筷子一样容易折断，门架支撑就极易坍塌，这种情况必须杜绝。可调托座（底座）调节螺栓伸出长度不宜大于200 mm，当可调托座（含底座）的螺栓伸出长度大于200 mm时，可采取增加一道水平拉杆的固定措施。许多操作工人不了解这一点， 把螺栓拧出较长，又不采取措施加固，使门架受力大打折扣，往往导致坍塌事故发生。
Portal scaffolding installation has its own standards, to be uniform, and in the two directions perpendicular to each other to ensure the stability of the support system, in the field before the installation of stringent line according to the design requirements. When the portal support is installed, it is required that a 48 x 3.5 steel pipe horizontal tie rod be added to each floor of the portal frame to fasten it. Longitudinal and transverse vertical scissors are arranged in spacing less than 6m. The support force of portal steel tubular scaffolding mainly depends on the overall force of the support frame. To exert this overall effect, it is necessary to "bundle" each thin portal frame by means of longitudinal and horizontal horizontal horizontal tie rods and vertical and horizontal scissors. If there is no vertical and horizontal horizontal tie rod and vertical scissors brace, it is as easy to break as chopsticks, and the portal frame support is very easy to collapse. This situation must be eliminated. The extension length of adjustable bracket (base) adjusting bolt should not be greater than 200 mm. When the extension length of adjustable bracket (including base) bolt is greater than 200 mm, a fixed measure of adding a horizontal tie rod can be adopted. Many operators do not understand this point. They twist the bolts out for a long time without taking measures to reinforce them, which greatly reduces the stress of the portal frame and often leads to collapse accidents.
连接构建方面，门架的各种连接扣件螺栓拧紧扭力矩在40~65 N-m之间，以防构件不能有效承 力或被破坏，搭设完成后用扳手随 机抽样检查，不合格的必须重新拧紧，直至合格为止。不允许缺少连接构件或螺栓拧而不紧或在安装后随意拆卸，使门式脚手架发生变形 而受到破坏。支撑立杆要垂直，纵横向水平杆要平整。立杆应尽量采 用通长钢管，如需接管，接头要错开，不在同一步距内，立杆口必须按规 范对接，确保架体垂直度。相邻的两根纵向水平杆的接头要互相交错，接驳口必须按规范对接。
In connection construction, the bolt tightening torque of all kinds of connection fasteners of portal frame is between 40 and 65 N-m, in order to prevent members from being effectively loaded or destroyed, random sampling inspection with spanners after erection is completed, and unqualified fasteners must be tightened again until they are qualified. It is not allowed to lack connection members or bolts to be screwed tightly or to be disassembled at will after installation, so that the portal scaffolding will be deformed and damaged. The supporting poles should be vertical and the horizontal and vertical poles should be flat. The vertical pole should be as long as possible. If the pipe needs to be taken over, the joint should be staggered and not in the same step. The vertical of the vertical pole must be docked in accordance with the specifications to ensure the verticality of the frame. The joints of two adjacent vertical horizontal poles should be interlaced with each other, and the joints must be docked in accordance with the specifications.
Accident rescue measures
If there is a scaffold collapse accident, don't blindly rescue. If there is an emergency that endangers the safety of electricity use, the power supply should be cut off immediately. When it is confirmed that there is no danger of continued collapse, rescuers should be organized and effective measures should be taken to rescue. First, the injured should be rescued, and then property should be rescued. Only by paying attention to these matters and adopting these structural measures to strengthen the support of portal scaffolding, can the portal scaffolding play an effective and safe role, and can it prevent workers from falling at high altitudes to the utmost.
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