In the process of using cable tray in Shandong, it is inevitable to encounter problems. The common problem is the short circuit of cable tray. Therefore, the following bridge manufacturer will tell you what preparation should be made to avoid short circuit of cable bridge: the common problem in the use of cable tray is short circuit, which may be caused by internal short circuit of cable or burning of cable.
Generally speaking, the cable quality is too low. Cable tray will expand and contract in the process of use. Due to the change of ambient temperature, for example, steel cable tray will expand with heat and shrink with cold. The effect of outdoor bridge is greatly affected by temperature. Therefore, attention should be paid to the temperature change in the process of use.
Shandong cable bridge
Xiaobian reminds you that before installing cable tray, you should not only meet the required load deflection, but also consider the convenience of installation according to the structural characteristics of the building, the calculated load, the size and deflection of the bridge and the determination of appropriate span. The preparatory work for bridge installation is to erect scaffold between two abutments and lay a saddle plate as the steel bridge installation platform of pneumatic ball valve. The loader will be used for site leveling from abutment to construction road on both sides. Draw the yard line and mark the stacking position of bridge components, accessories and installation tools.
The position of rocking roll, flat roller and seat plate is determined by surveying and setting out. Measure the elevation of bridge line pile, swing pile, flat pile and coordinate sheet pile. The distance that can be reached from the end of nose frame on the other side shall be measured at the middle pile of bridge. The accessories, erection tools and various mechanical equipment required for bridge erection shall be fully prepared and transported to the construction site by 5T dump truck in batches. Outdoor installation of process pipeline can be considered, but it should be noted that the cable drum should be installed on the flammable, explosive and low-risk side.
1. Appearance inspection of Shandong cable bridge door frame, enter the construction site, should submit the following data, product factory certificate, provincial and Municipal Quality Supervision Station periodic inspection report and relevant technical appraisal documents, such as the thickness of cable bridge door frame plate should meet the relevant requirements. The coating surface of galvanized cable tray shall be uniform without excessive combustion, ash hanging and partial non galvanizing. The electrostatic spraying should be smooth, smooth, even, without skin and bubble. The blister bridge itself should be smooth and free from distortion. The inner wall should be smooth. The weld surface of the bridge should be uniform without burr. There should be no defects such as missed welding, crack and burn through.
2. When the cable tray is laid horizontally, the installation position and height from the ground of the cable tray shall not be less than 2.5m. When the bridge is laid in multiple layers, there should be a certain distance between the bridge layers to meet the needs of heat dissipation, maintenance and anti-interference. When the cable tray is laid in parallel with various pipelines, the clear distance shall comply with relevant regulations.
3.支吊架的安装，电缆桥架支吊架的质量应符合现行相关技术标准。电缆桥架水平敷设时，支撑跨度一般为1.5 ~ 3 m，垂直敷设时，固定间距不大于2 m，相邻两个桥架支撑臂之间的水平高差不大于10 mm，相邻两个桥架支撑臂垂直中间线的垂直偏差不大于20m.
3. The installation of supports and hangers and the quality of supports and hangers of cable tray shall comply with the current relevant technical standards. When the cable tray is horizontally laid, the support span is generally 1.5 ~ 3 m; when it is vertically laid, the fixed spacing is not more than 2 m; the horizontal height difference between two adjacent bridge support arms is not more than 10 mm; and the vertical deviation of the vertical middle line of the two adjacent bridge support arms is not more than 20 m
(1) Determine the direction: according to the building layout, combined with the setting conditions of air conditioning pipes and electrical pipes, easy to maintain
4. Material statistics
(1) Bridge: the total length of various types and specifications of bridge is calculated separately. In addition to the standard length of the bridge, the number of bridges is obtained, and an increase of 1% - 2% is allowed.
(2)立柱：如果采用统一的柱规格，可用桥架的总长度除以平均柱间距，得出柱数，余额增加2% ~ 4%。如果列规格不同，则需要单独的统计数据。
(2) Column: if a uniform column specification is adopted, the total length of the bridge can be divided by the average column spacing to get the number of columns, and the balance will be increased by 2% - 4%. If the column specifications are different, separate statistics are required.
(3)托臂：桥架总长度除以架平均间距，差额增加1% ~ 2%，即为总需求。
(3) Corbel: the total length of the bridge divided by the average spacing of the frame increases by 1% - 2%, which is the total demand.
(4) Other parts: multiply the number of main parts by a certain proportion to get the total number.
Shandong cable bridge
According to the author's opinion, Shandong cable tray needs to be searched and used according to relevant regulations. Different types of cable tray have different application scope, so it is necessary to find suitable cable tray according to its own requirements. Do not blindly choose to use, which not only can not guarantee the use effect, but also shorten the service life of the bridge. I hope the above can help you. For more information, please click the official website: http://www.sdhangfeng.com