Installation sequence of cable tray: Measurement and positioning → fabrication and installation of supports and hangers → tray installation → grounding treatment

1、測(cè)量定位：

1. Measurement and positioning:

用彈線法標(biāo)識(shí)橋架的安裝位置，確定好支架的固定位置，做好標(biāo)記。豎井內(nèi)橋架定位應(yīng)先用懸鋼絲法確定安裝基準(zhǔn)線，如預(yù)留洞不合適，應(yīng)及時(shí)調(diào)整，并做好修補(bǔ)。

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、電纜橋架制作安裝

2. Fabrication and installation of cable tray

我們依據(jù)施工圖設(shè)計(jì)標(biāo)高及橋架規(guī)格，進(jìn)行定位，然后依照測(cè)量尺寸制作支架，支架進(jìn)行工廠化生產(chǎn)。在無(wú)吊頂處沿梁底吊裝或靠墻支架安裝，在有吊頂處在吊頂內(nèi)吊裝或靠墻支架安裝。在無(wú)吊頂?shù)墓矆?chǎng)所結(jié)合結(jié)構(gòu)構(gòu)件并考慮建筑美觀及檢修方便，采用靠墻、柱支架安裝或屋架下弦構(gòu)件上安裝。靠墻安裝支架固定采用膨脹螺栓固定，支架間距不超過(guò)2米。在直線段和非直線段連接處、過(guò)建筑物變形縫處和彎曲半徑大于300mm的非直線段中部應(yīng)增設(shè)支吊架，支吊架安裝應(yīng)保證橋架水平度或垂直度符合要求。

We 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、電纜橋架

3. Cable tray

a.對(duì)于特殊形狀橋架，將現(xiàn)場(chǎng)測(cè)量的尺寸交于材料供應(yīng)商，由供應(yīng)商依據(jù)尺寸制作，減少現(xiàn)場(chǎng)加工。橋架材質(zhì)、型號(hào)、厚度以及附件滿足設(shè)計(jì)要求。

a. 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.

b.橋架安裝前，必須與各協(xié)調(diào)，避免與大口徑消防管、噴淋管、冷熱水管、排水管及空調(diào)、排風(fēng)設(shè)備發(fā)生矛盾。

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

c.將橋架舉升到預(yù)定位置，與支架采用螺栓固定，在轉(zhuǎn)彎處需仔細(xì)校核尺寸，橋架宜與建筑物坡度一致，在圓弧形建筑物墻壁的橋架，其圓弧宜與建筑物一致。橋架與橋架之間用連接板連接，連接螺栓采用半圓頭螺栓，半圓頭在橋架內(nèi)側(cè)。橋架之間縫隙須達(dá)到設(shè)計(jì)要求，確保一個(gè)系統(tǒng)的橋架連成一體。

c. 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.

d.跨越建筑物變形縫的橋架應(yīng)按企業(yè)標(biāo)準(zhǔn)《鋼制電纜橋架安裝工藝》做好伸縮縫處理，鋼制橋架直線段超過(guò)30m時(shí)，應(yīng)設(shè)熱脹冷縮補(bǔ)償裝置。

d. 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.

e.橋架安裝橫平豎直、整齊美觀、距離一致、連接牢固，同一水平面內(nèi)水平度偏差不超過(guò)5mm/m，直度偏差不超過(guò)5mm/m。

e. 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、接地處理

4. Grounding treatment

電纜橋架的接地處理鍍鋅橋架之間可利用鍍鋅連接板作為跨接線，把橋架連成一體。在連接板兩端的兩只連接螺栓上加鍍鋅彈簧墊圈，橋架之間用不小于4mm2軟銅線進(jìn)行跨接，再將橋架與接地線相連，形成電氣通路。橋架整體與接地干線應(yīng)有不少于兩處的連接。

The grounding treatment of cable tray can use galvanized connecting plate as jumper between galvanized trays to connect the trays into one. 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、多層橋架安裝;分層橋架安裝

5. Multi layer bridge installation; Layered bridge installation

先安裝上層，后安裝下層，上、下層之間距離要留有余量，有利于后期電纜敷設(shè)和檢修。水平相鄰橋架凈距不宜小于50mm，層間距離應(yīng)根據(jù)橋架寬度小不小于150mm，與弱電電纜橋架距離不小于0.5m。

Install the upper layer 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.

6、確定環(huán)境條件環(huán)境條件一般有三種：腐蝕環(huán)境、正常環(huán)境、特殊環(huán)境。

6. Determine the environmental conditions. There are generally three environmental conditions: corrosive environment, normal environment and special environment.

確定走向根據(jù)多數(shù)電纜走向，在室內(nèi)可沿著、柱、梁、樓板走，在室外盡可能沿工藝管道走。計(jì)算荷重計(jì)算在電纜橋架走向斷面上的單位長(zhǎng)度電纜的重量q及總荷載G總=n1q1+n2q2……nnqn式中：q1·q2·q3……qn為每根電纜單位重量(kg／ m)n1·n2·n3……nn為相同電纜根數(shù)G總允（電纜僑架的允許荷載參照荷載曲線圖表）選擇橋架根據(jù)電纜荷載及橋架安裝處的環(huán)境，以橋架的載荷曲線為依據(jù)，來(lái)確定的類型和規(guī)格及立柱的間距、托臂的長(zhǎng)度、橋架的層次，立柱的長(zhǎng)度等。根據(jù)電纜走向及安裝的環(huán)境確定橋架的固定方式；懸掛式、直立式，(這兩種形式均可采用單側(cè)固定或雙側(cè)固定)、壁側(cè)式等。

Determine the direction. According to the direction of most cables, it can go along, columns, beams and floors indoors and process pipes outdoors as much as possible. Calculate the load. Calculate the weight Q and total load of the unit length of cable on the strike section of the cable tray. Gtotal = n1q1 + n2q2... Nnqn, where Q1 · Q2 · Q3... QN is the unit weight of each cable (kg / M) N1 · N2 · N3... NN is the total allowable number of cables g (refer to the load curve chart for the allowable load of the cable frame). Select the cable tray according to the cable load and the environment where the cable tray is installed, Based on the load curve of the bridge, determine the type and specification of the, the spacing of the columns, the length of the supporting arm, the level of the bridge, the length of the columns, etc. Determine the fixing mode of the bridge according to the cable direction and installation environment; Hanging type, vertical type (both forms can adopt unilateral fixation or bilateral fixation), wall side type, etc.

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