1、 Construction sequence

测量定位→支吊架制作安装→桥架安装→接地处理

Measurement and positioning → fabrication and installation of supports and hangers → bridge installation → grounding treatment

二、主要施工方法及技术措施

2、 Main construction methods and technical measures

1、测量定位

1. Measurement and positioning

用弹线法标识桥架的安装位置，确定好支架的固定位置，做好标记。竖井内桥架定位应先用悬钢丝法确定安装基准线，如预留洞不合适，应及时调整，并做好修补。

Mark the installation position of the bridge with the snap line method, determine the fixed position of the support and mark it. The installation datum line shall be determined by the hanging steel wire method for the positioning of the bridge in the shaft. If the reserved hole is inappropriate, it shall be adjusted in time and repaired.

2、支架制作安装

2. Fabrication and installation of support

依据施工图设计标高及桥架规格，进行定位，然后依照测量尺寸制作支架，支架进行工厂化生产。在无吊顶处沿梁底吊装或靠墙支架安装，在有吊顶处在吊顶内吊装或靠墙支架安装。在无吊顶的公共场所结合结构构件并考虑建筑美观及检修方便，采用靠墙、柱支架安装或屋架下弦构件上安装。靠墙安装支架固定采用膨胀螺栓固定，支架间距不超过2米。在直线段和非直线段连接处、过建筑物变形缝处和弯曲半径大于300mm的非直线段中部应增设支吊架，支吊架安装应保证桥架水平度或垂直度符合要求。

Locate according to the design elevation of the construction drawing and the specification of the bridge, and then make the support according to the measured size for industrialized production. Where there is no ceiling, it shall be hoisted along the beam bottom or installed by the wall support, and where there is ceiling, it shall be hoisted in the ceiling or installed by the wall support. In public places without suspended ceiling, combined with structural components and considering the beauty of the building and convenient maintenance, it shall be installed against the wall, column support or on the lower chord components of roof truss. The support installed against the wall shall be fixed with expansion bolts, and the spacing between supports shall not exceed 2m. Supports and hangers shall be added at the connection of linear section and non-linear section, at the deformation joint of building and in the middle of non-linear section with bending radius greater than 300mm. The installation of supports and hangers shall ensure that the levelness or verticality of bridge meets the requirements.

3、桥架安装

3. Bridge installation

对于特殊形状桥架，将现场测量的尺寸交于材料供应商，由供应商依据尺寸制作，减少现场加工。桥架材质、型号、厚度以及附件满足设计要求。

For bridges with special shapes, the dimensions measured on site shall be handed over to the material supplier, who shall make them according to the dimensions to reduce on-site processing. The material, model, thickness and accessories of the bridge meet the design requirements.

桥架安装前，需要与各协调，避免与大口径消防管、喷淋管、冷热水管、排水管及空调、排风设备发生矛盾。

Before the installation of the bridge, it is necessary to coordinate with each to avoid conflicts with large-diameter fire pipe, spray pipe, cold and hot water pipe, drainage pipe, air conditioning and exhaust equipment.

将桥架举升到预定位置，与支架采用螺栓固定，在转弯处需仔细校核尺寸，桥架宜与建筑物坡度一致，在圆弧形建筑物墙壁的桥架，其圆弧宜与建筑物一致。桥架与桥架之间用连接板连接，连接螺栓采用半圆头螺栓，半圆头在桥架内侧。桥架之间缝隙须达到设计要求，确保一个系统的桥架连成一体。

Lift the bridge to the predetermined position and fix it with the support with bolts. Carefully check the size at the turning. The bridge should be consistent with the slope of the building. For the bridge on the wall of the circular arc building, the arc should be consistent with the building. The bridge is connected with the bridge by connecting plate, and the connecting bolt adopts half round head bolt, and the half round head is on the inner side of the bridge. The gap between bridges must meet the design requirements to ensure that the bridges of a system are connected as a whole.

跨越建筑物变形缝的桥架应按企业标准《钢制电缆桥架安装工艺》做好伸缩缝处理，钢制桥架直线段超过30m时，应设热胀冷缩补偿装置。

The expansion joint of the bridge crossing the deformation joint of the building shall be treated according to the enterprise standard installation process of steel cable bridge. When the straight section of the steel bridge exceeds 30m, a thermal expansion and cold contraction compensation device shall be set.

桥架安装横平竖直、整齐美观、距离一致、连接牢固，同一水平面内水平度偏差不超过5mm/m，直线度偏差不超过5mm/m。

The bridge shall be installed horizontally and vertically, neat and beautiful, with the same distance and firm connection. The levelness deviation in the same horizontal plane shall not exceed 5mm / M and the straightness deviation shall not exceed 5mm / m.

4、接地处理

4. Grounding treatment

镀锌桥架之间可利用镀锌连接板作为跨接线，把桥架连成一体。在连接板两端的两只连接螺栓上加镀锌弹簧垫圈，桥架之间用不小于4mm2软铜线进行跨接，再将桥架与接地线相连，形成电气通路。桥架整体与接地干线应有不少于两处的连接。

Galvanized connecting plates can be used as jumper wires between galvanized bridges to connect the bridges as a whole. Galvanized spring washers shall be added to the two connecting bolts at both ends of the connecting plate. The bridge shall be bridged with soft copper wire of no less than 4mm2, and then the bridge shall be connected with the grounding wire to form an electrical path. There shall be at least two connections between the whole bridge and the grounding main line.

5、多层桥架安装

5. Multi layer bridge installation

分层桥架安装，先安装上层，后安装下层，上、下层之间距离要留有余量，有利于后期电缆敷设和检修。水平相邻桥架净距不宜小于50mm，层间距离应根据桥架宽度小不小于150mm，与弱电电缆桥架距离不小于0.5m。

For layered bridge installation, the upper layer shall be installed first and then the lower layer. The distance between the upper and lower layers shall be reserved to facilitate cable laying and maintenance in the later stage. The clear distance between horizontal adjacent bridges shall not be less than 50mm, the distance between layers shall not be less than 150mm according to the bridge width, and the distance from weak current cable bridge shall not be less than 0.5m.

（1）电气图纸的分类包括变配电工程施工图、动力工程施工图、照明工程施工图、防雷接地工程施工图、弱电工程施工图、架空线路施工图。

(1) The classification of electrical drawings includes construction drawings of power transformation and distribution works, power works, lighting works, lightning protection and grounding works, weak current works and overhead lines.

（2）电气图纸的组成包括图纸目录；设计说明；系统图；平面图；大样图；原理图；设备材料表等。

(2) Composition of electrical drawings, including drawing catalogue; Design description; System diagram; plan; Detail drawing; schematic diagram; List of equipment and materials, etc.

（3）电气线路文字标注格式a－b（c×d）e－f。a表示线路编号或线路用途符号、b表示导线型号、c表示导线根数、d表示导线截面、e表示配线方式符号及导线穿管管径、f表示敷设部位符号。

(3) Electrical circuit text annotation format A-B (c) × d）e－f。 A represents the line number or line purpose symbol, B represents the wire model, C represents the number of wires, D represents the wire section, e represents the wiring mode symbol and the pipe diameter of the wire, and f represents the laying position symbol.

（4）灯具安装的标注方法a－b（c×d×L）/e－f。a表示灯具数量、b表示灯具型号或编号、c表示灯具发光体的数量、d表示发光体功率、L表示发光体光源种类、e表示灯具安装高度、f表示灯具安装方式。

(4) Marking method of lamp installation A-B (c) × d × L）/e－f。 A represents the number of lamps, B represents the model or number of lamps, C represents the number of luminaries of lamps, D represents the power of luminaries, l represents the type of light source of luminaries, e represents the installation height of lamps, and f represents the installation mode of lamps.

（5）电力系统的组成部分包括发电厂发电、变电站升压、高压架空输配电线路系统输电、变电站降压、城市高压输配电线路系统配电、高压配电柜受电、用户变压器降压。

(5) The components of power system include power generation of power plant, substation step-up, transmission of high-voltage overhead transmission and distribution line system, substation step-down, distribution of urban high-voltage transmission and distribution line system, power receiving of high-voltage distribution cabinet and step-down of user transformer.

（6）建筑电气工程组成部分有低压配电柜、配电线路、开关箱、控制开关、负荷。

(6) The components of building electrical engineering include low-voltage distribution cabinet, distribution line, switch box, control switch and load.

（7）电气安装工程常用的管材包括镀锌钢管、镀锌电线管、塑料电线管、金属软管。

(7) The commonly used pipes for electrical installation engineering include galvanized steel pipe, galvanized wire pipe, plastic wire pipe and metal hose.

（8）电气安装工程常用的电线包括单塑聚氯乙烯铜芯电线（BV）、双塑聚氯乙烯铜芯电线（BVV）、难燃单塑聚氯乙烯铜芯电线（ZR－BV）、难燃双塑聚氯乙烯铜芯电线（ZR－BVV）、耐火单塑聚氯乙烯铜芯电线（NH－BV）、耐火双塑聚氯乙烯铜芯电线（NH－BVV）。

(8) Wires commonly used in electrical installation engineering include single plastic PVC copper core wire (BV), double plastic PVC copper core wire (BVV), flame retardant single plastic PVC copper core wire (ZR-BV), flame retardant double plastic PVC copper core wire (zr-bvv), fire-resistant single plastic PVC copper core wire (nh-bv) and fire-resistant double plastic PVC copper core wire (nh-bvv).

（9）电线截面有1.0mm2、1.5mm2、2.5mm2、4mm2、6mm2、10mm2、16mm2、25mm2、35mm2、50mm2、70mm2、95mm2、120mm2、150mm2、185mm2、240mm2、300mm2、400mm2。

(9) The wire sections are 1.0mm2, 1.5mm2, 2.5mm2, 4mm2, 6mm2, 10mm2, 16mm2, 25mm2, 35mm2, 50mm2, 70mm2, 95mm2, 120mm2, 150mm2, 185mm2, 240mm2, 300mm2 and 400mm2.

（10）电气安装工程常用的电缆包括普通电缆（VV）、铠装电缆（VV22）、控制电缆（KVV）、难燃电缆（ZR－VV）、难燃铠装电缆（ZR－VV22）、难燃控制电缆（ZR－KVV）、耐火电缆（NH－VV）、耐火控制电缆（NH－KVV）。

(10) Cables commonly used in electrical installation engineering include ordinary cable (VV), armored cable (vv22), control cable (KVV), flame retardant cable (zr-vv), flame retardant armored cable (zr-vv22), flame retardant control cable (ZR-KVV), fire-resistant cable (nh-vv) and fire-resistant control cable (nh-kvv).

（11）电气安装工程常用的电缆规格包括单芯、双芯、三芯、四等芯、国标四芯（3＋1）、非标四芯（3＋1）、五等芯、国标五芯（4＋1）、非标五芯（4＋1）、国标五芯（3＋2）、非标五芯（3＋2）。

(11) The cable specifications commonly used in electrical installation engineering include single core, double core, three core, fourth grade core, national standard four core (3 + 1), non-standard four core (3 + 1), fifth grade core, national standard five core (4 + 1), non-standard five core (4 + 1), national standard five core (3 + 2) and non-standard five core (3 + 2).

（12）灯具包括：白炽灯、荧光灯、吸顶灯、吊灯、组合花灯、筒灯、应急灯、指示灯等等。

(12) Lamps and lanterns include: incandescent lamp, fluorescent lamp, ceiling lamp, chandelier, combined flower lamp, down lamp, emergency lamp, indicator lamp, etc.

（13）室内电气配线工程包括明配线路：线码配线、槽板配线、线管配线、线槽配线、护套线配线、纲索配线。暗配线路：线管配线。电缆线路：直埋敷设、管内敷设、桥架敷设。

(13) Indoor electrical wiring works include exposed distribution lines: wire code wiring, slot plate wiring, conduit wiring, slot wiring, sheath wiring and cable wiring. Concealed wiring: conduit wiring. Cable route: directly buried laying, in pipe laying and bridge laying.

（14）控制电器有闸刀开关、铁壳开关、组合开关、空气开关。保护电器：熔断器、漏电保护器。

(14) The control appliances include knife switch, iron shell switch, combination switch and air switch. Protective appliances: fuse and leakage protector.

（15）建筑弱电系统工程包括共用天线有线电视系统、电话通讯系统、广播音响系统、火灾自动报警和自动灭火系统、闭路电视监控系统、防范系统、综合布线系统。

(15) Building weak current system works include common antenna cable TV system, telephone communication system, broadcast sound system, automatic fire alarm and automatic fire extinguishing system, closed-circuit television monitoring system, prevention system and generic cabling system.

（16）民用建筑低压配电系统接地形式有TN系统、TT系统、IT系统。

(16) The grounding forms of low-voltage distribution system in civil buildings include TN system, TT system and it system.

（17）而TN系统是为常见的一种，是指电力系统有一点直接接地，受电设备的外露可导电部分通过保护线与接地点连接。按照中性线与保护线组合情况，可分为TN-S系统、TN-C系统、TN-C-S系统。

(17) TN system is a common one, which means that there is a point of direct grounding in the power system, and the exposed conductive part of the power receiving equipment is connected with the grounding point through the protective wire. According to the combination of neutral line and protection line, it can be divided into TN-S system, TN-C system and TN-C-S system.

（18）按照我国的要求，我国建筑物防雷标准共分为一类防雷建筑物、二类防雷建筑物、三类防雷建筑物三种。

(18) According to China's requirements, China's building lightning protection standards are divided into class I lightning protection buildings, class II lightning protection buildings and class III lightning protection buildings.

（19）建筑物的防雷措施包括安装避雷针、避雷带、避雷网、避雷笼网、防雷引下线、防雷接地装置等。

(19) Lightning protection measures for buildings include installation of lightning rod, lightning strip, lightning network, lightning cage network, lightning down lead, lightning grounding device, etc.

本文的精彩内容由山东电缆桥架提供知识提供，本网站还有很多的精彩内容，更多的内容您可以点击进入：http://www.sdhangfeng.com我们有专门的客服为您解答问题

The wonderful contents of this article are provided by Shandong cable bridge. There are many wonderful contents on this website. You can click to enter more contents: http://www.sdhangfeng.com We have special customer service to answer your questions