一：施工準(zhǔn)備

　　1： Construction preparation

　　1、技術(shù)準(zhǔn)備：熟悉施工圖與圖紙會審紀(jì)要。

　　1. Technical preparation: Familiar with construction drawings and drawing review minutes.

　　2、材料要求：電纜橋架厚度符合橋架規(guī)范要求，表面處理的涂層均勻、厚度符合要求，全部采用熱鍍鋅支、吊架，配件齊全。

　　2. Material requirements: The thickness of the cable tray meets the specifications of the tray, the surface treatment coating is uniform, the thickness meets the requirements, all use hot-dip galvanized supports and hangers, and the accessories are complete.

　　3、主要機具：鋸弓、鋸條，切割機、電錘、電鉆、臺鉆、砂輪機、電焊機、鋼角尺、水平尺、紅外線放線儀、梯子。

　　3. Main equipment: saw bow, saw blade, cutting machine, electric hammer, electric drill, bench drill, grinding wheel machine, welding machine, steel angle ruler, level ruler, infrared pay off instrument, ladder.

　　4、作業(yè)條件：

　　4. Homework conditions:

　　A、 施工路線上的障礙物已全部拆除；B、 土建抹灰已完成；

　　A、 All obstacles on the construction route have been removed; B、 The civil engineering plastering has been completed;

　　5、施工組織部署：吊頂內(nèi)橋架安裝 地下室橋架安裝 豎井內(nèi)橋架安裝 電纜敷設(shè)與終端制安

　　5. Construction organization deployment: Installation of cable trays inside the ceiling, installation of cable trays in the basement, installation of cable trays in the vertical shaft, cable laying and terminal installation

　　二：施工工藝

　　2： Construction technology

　　1、工藝流程：

　　1. Process flow:

　　熱鍍鋅支、吊架制安 橋架安裝 橋架接地 電纜敷設(shè) 橋架蓋蓋板 電纜終端制安

　　Hot dip galvanized support and hanger installation, bridge installation, bridge grounding cable laying, bridge cover plate, cable terminal installation

　　2、施工工藝：

　　2. Construction technology:

　　1、熱鍍鋅支、吊架制作：熱鍍鋅型鋼調(diào)直、下料、鉆孔、組對、焊接。鉆孔必須要用臺鉆或飛機鉆鉆孔，不得用氣電焊割孔；熱鍍鋅支、吊架的安裝位置要求是：水平直線段不大于3m，豎直段不大于2m,橋架三通、彎通等異形件500mm范圍內(nèi)應(yīng)設(shè)置熱鍍鋅支、吊架。所有支、吊架必須接地可靠，且不得位于橋架連接處。

　　1. Production of hot-dip galvanized supports and hangers: straightening, cutting, drilling, assembling, and welding of hot-dip galvanized steel sections. Drilling must be done using a bench drill or an aircraft drill, and gas electric welding is not allowed to cut holes; The installation position requirements for hot-dip galvanized supports and hangers are: the horizontal straight section should not exceed 3m, the vertical section should not exceed 2m, and hot-dip galvanized supports and hangers should be installed within 500mm of special-shaped parts such as bridge tees and bends. All supports and hangers must be reliably grounded and must not be located at the connection of the bridge.

　　2、安裝前的檢查：合格證齊全、材質(zhì)證書齊全，外觀尺寸偏差符合標(biāo)準(zhǔn)要求；

　　2. Pre installation inspection: The certificate of conformity is complete, the material certificate is complete, and the appearance size deviation meets the standard requirements;

　　3、橋架連接：連接應(yīng)緊密平正，螺母在外，螺栓齊全，內(nèi)側(cè)無鋒口，加工面已做防腐處理。鍍鋅橋架連接板兩端的螺栓中應(yīng)有不少于2個螺栓帶有彈簧墊圈；防火橋架連接板處的所有螺栓均應(yīng)配彈簧墊。橋架直線段超過30m時,其連接處要應(yīng)設(shè)伸縮連接板,伸縮連接板的螺絲孔每片僅2個,螺母為蝶形螺母,無需彈簧墊,螺母帶上后不要擰緊。橋架縱向穿樓板處應(yīng)在每邊各打2個Φ9的孔，孔要排列均勻，呈水平狀，以供電纜放完后的防火封堵用。

　　3. Bridge connection: The connection should be tight and straight, with nuts on the outside, complete bolts, no sharp edges on the inside, and the machined surface has been treated with anti-corrosion. There should be no less than 2 bolts with spring washers on both ends of the galvanized bridge connecting plate; All bolts at the connection plate of the fireproof bridge should be equipped with spring washers. When the straight section of the bridge exceeds 30m, expansion connection plates should be installed at the connection points. The screw holes of each expansion connection plate are only 2, and the nuts are butterfly nuts without spring washers. Do not tighten the nuts after putting them on. At the longitudinal penetration of the bridge through the floor slab, two Φ 9 holes should be drilled on each side. The holes should be arranged evenly and horizontally for fireproof sealing after the cables are placed.

　　4、橋架的接地：

　　4. Grounding of cable tray:

　　A、強電井內(nèi)鍍鋅橋架接地：在強電井內(nèi)單獨敷一根-25*4的鍍鋅扁鋼，此扁鋼與每段橋架用BVR-4少做一次可靠連接，固定螺絲可采用橋架的連接螺絲。

　　A、 Grounding of galvanized cable tray in strong current well: A separate -25 * 4 galvanized flat steel shall be laid in the strong current well, and this flat steel shall be reliably connected to each section of the cable tray at least once with BVR-4. The fixing screws can be the connection screws of the cable tray.

　　B、其它部位利用金屬橋架做接地線：各連接處的兩側(cè)均要用不小于16mm2的銅編織線做跨接，連接前，應(yīng)用接地墊圈將接地螺絲孔周圍的防護(hù)層，并用雙臂直流電橋?qū)崪y橋架連接處的電阻，電阻值不大于0.00033Ω的為合格,接地跨接處橋架外側(cè)依次是接地墊圈、接地線端子、平墊、螺母。

　　B、 Other parts use metal cable trays as grounding wires: Copper braided wires of not less than 16mm2 should be used on both sides of each connection for cross connection. Before connection, the protective layer around the grounding screw hole should be removed with a grounding washer, and the resistance at the connection of the cable tray should be measured using a double arm DC bridge. If the resistance value is not greater than 0.00033 Ω, it is qualified. The outer side of the cable tray at the grounding cross connection is the grounding washer, grounding wire terminal, flat washer, and nut in sequence.

　　5、橋架固定：橋架固定后要保持橫平豎直，線性偏差不大于5mm，橋架調(diào)平后應(yīng)與橋架接觸。直線 段超過30m時，應(yīng)設(shè)置伸縮節(jié)。伸縮節(jié)的做法是：將連接處的一頭螺栓孔開成長孔，帶上螺栓不緊固，連接處的另一頭按常規(guī)連接即可。

　　5. Bridge fixing: After the bridge is fixed, it should be kept horizontal and vertical, with a linear deviation of no more than 5mm. After the bridge is leveled, it should be in contact with the bridge. When the straight section exceeds 30m, expansion joints should be installed. The method of the expansion joint is to make a long hole in one end of the bolt hole at the connection, without tightening the bolt, and connect the other end of the connection as usual.

　　6、電纜敷設(shè)：低壓電纜敷設(shè)前，應(yīng)拆開電纜封頭，用1000V搖表對電纜進(jìn)行絕緣搖測，電阻應(yīng)大于10MΩ,并根據(jù)低壓柜出線圖對電纜進(jìn)行統(tǒng)一排序；電纜敷設(shè)時，電纜應(yīng)從盤上拉出,嚴(yán)禁有絞擰,嚴(yán)禁橫拉猛拽。橋架內(nèi)電纜排列要整齊，豎井內(nèi)電纜按1m間距綁扎，水平方向按每10m綁扎一次,綁扎材料為黑色扎帶。電纜占橋架的橫截面積不得大于橋架橫截面積的50%。電纜敷設(shè)到位后,應(yīng)及時在電纜的終端和分支處掛電纜牌。

　　6. Cable laying: Before laying low-voltage cables, the cable heads should be removed, and insulation shake tests should be conducted on the cables using a 1000V shake meter. The resistance should be greater than 10M Ω, and the cables should be sorted uniformly according to the low-voltage cabinet outgoing diagram; When laying cables, they should be pulled out from the reel, and twisting or pulling horizontally is strictly prohibited. The cables in the bridge should be arranged neatly, and the cables in the vertical shaft should be tied at a spacing of 1m. The horizontal direction should be tied every 10m, and the binding material should be black zip ties. The cross-sectional area of the cable tray shall not exceed 50% of the cross-sectional area of the tray. After the cable is laid in place, cable tags should be hung at the terminals and branches of the cable in a timely manner.

　　7、電纜掛牌:電纜首末\拐彎處\交叉處應(yīng)掛電纜標(biāo)牌,標(biāo)牌上要注明:電纜代號、電壓等級、起始位置、規(guī)格型號。

　　7. Cable tagging: Cable tags should be hung at the beginning, end, bend, and intersection of the cable. The tags should indicate the cable code, voltage level, starting position, and specifications.

　　8橋架防火封堵：橋架穿越不同防火分區(qū)處均需進(jìn)行防火封堵。先在橋架穿樓板處的內(nèi)側(cè)穿好鐵絲，然后將防火枕密碼在橋架內(nèi)側(cè)；橋架外側(cè)用防火膠泥填封，并加鋁條歸整平實。

　　Fire sealing of bridge trays: Fire sealing is required for bridge trays passing through different fire compartments. First, thread the iron wire on the inside of the bridge passing through the floor slab, and then password the fireproof pillow on the inside of the bridge; The outer side of the bridge frame is sealed with fireproof adhesive and leveled with aluminum strips.

　　9、橋架蓋蓋板：蓋板要齊全，與本體配套，蓋板表面清潔。

　　9. Bridge cover plate: The cover plate should be complete, matched with the body, and the surface of the cover plate should be clean.

　　10、電纜終端制安：變配電室內(nèi)全部做成熱縮終端頭，其他部位做干包式電纜終端頭,制作電纜頭時,從剝切電纜開始應(yīng)連續(xù)到完成操作,縮短絕緣暴露時間。電纜頭的操作工藝如下:

　　10. Cable terminal installation: All transformer and distribution rooms are made with heat shrinkable terminal heads, while other parts are made with dry pack cable terminal heads. When making cable heads, the process should be continuous from cable stripping to completion to shorten the insulation exposure time. The operation process of cable head is as follows:

　　①、干包式電纜頭：

　　① Dry pack cable head:

　　A、絕緣搖測：1000V搖測,絕緣電阻在10MΩ以上為合格。搖完后先取下紅表筆，再讓電纜各線芯充分放電，一般時間為1min。

　　A、 Insulation shake test: 1000V shake test, insulation resistance above 10M Ω is qualified. After shaking, remove the red probe first, and then allow each core of the cable to fully discharge, usually for 1 minute.

　　B、剝切電纜外絕緣和線芯絕緣；

　　B、 Peel off the outer insulation and core insulation of the cable;

　　C、壓接銅接線端子；

　　C、 Crimp copper wire terminals;

　　D、拿PVC膠粘帶用半疊法包纏電纜頭的根部，粘膠帶要纏緊密，形狀呈棗核狀，以手套套入緊密為宜；

　　D、 Wrap the root of the cable head with PVC adhesive tape using a half stack method. The adhesive tape should be tightly wrapped in a jujube shaped shape, and gloves should be tightly fitted;

　　E、套上塑料手套，在線芯端子壓接部位和電纜線芯分叉處各線芯根部分別用PVC粘膠帶包繞防潮錐，防潮錐的外徑比線芯絕緣外徑大8mm即可。

　　E、 Put on plastic gloves and wrap moisture-proof cones around the crimping parts of the wire core terminals and the branching points of the cable core at the root of each wire core with PVC adhesive tape. The outer diameter of the moisture-proof cone should be 8mm larger than the outer diameter of the wire core insulation.

　　F、包繞線芯絕緣層：用PVC粘膠帶在電纜分支手套指端起到電纜端頭，按半疊法包纏2層。并在端子壓接處的粘膠帶外包纏相色帶2-3層。

　　F、 Wrap the core insulation layer: Use PVC adhesive tape to wrap the cable branch glove from the finger end to the cable end, and wrap it in two layers using a half stack method. Wrap 2-3 layers of adhesive tape around the terminal crimping area.

　　G、固定電纜頭，連接線芯端子。

　　G、 Fix the cable head and connect the wire core terminals.

　　②、熱縮終端頭：

　　② Heat shrink terminal head:

　　A、絕緣搖測；

　　A、 Insulation shake test;

　　B、剝切電纜外絕緣和線芯絕緣；

　　B、 Peel off the outer insulation and core insulation of the cable;

　　C、線芯分支處包繞電纜填充膠，使其呈橄欖形；繞包密封膠帶，做防潮段，其長度60mm，其直徑比電纜外徑大15mm。

　　C、 Wrap the cable filling glue around the branch of the wire core to make it olive shaped; Wrap the sealing tape and make a moisture-proof section, with a length of 60mm and a maximum diameter 15mm larger than the outer diameter of the cable.

　　D、熱縮固定塑料手套：從根部向兩端收縮固定。

　　D、 Heat shrink fixed plastic gloves: shrink and fix from the base to both ends.

　　E、壓接端子；

　　E、 Crimping terminal;

　　F、熱縮固定線芯絕緣管；

　　F、 Heat shrink fixed core insulation tube;

　　G、填充壓接端子上的壓坑，在壓接端子的銅管部位套上相色管，熱縮固定相色管。

　　G、 Fill the pressure pit on the crimping terminal, insert a phase color tube into the copper tube of the crimping terminal, and heat shrink fix the phase color tube.

　　H、固定電纜頭，連接線芯端子。

　　H、 Fix the cable head and connect the wire core terminals.

　　三：質(zhì)量要求

　　3： Quality requirements

　　1、橋架型號、規(guī)格符合設(shè)計要求；

　　1. The bridge model and specifications meet the design requirements;

　　2、橋架及支架接地可靠、連續(xù),蓋板齊全,與橋架本體鎖緊；

　　2. The grounding of the bridge and bracket is reliable and continuous, the cover plate is complete, and it is locked with the bridge body;

　　3、橋架的不直度：水平或垂直允許偏差為其長度的2‰,全長不大于20mm；

　　3. The non straightness of the bridge frame: the allowable deviation for horizontal or vertical is 2 ‰ of its length, and the total length is not more than 20mm;

　　4、穿越不同防火分區(qū)處防火封堵嚴(yán)密；

　　4. Fire sealing is tightly sealed when passing through different fire compartments;

　　5、電纜絕緣良好，電纜頭制作規(guī)范，電纜頭各線芯色標(biāo)正確，與設(shè)備接線正確，未讓設(shè)備接線端子承受額外力。

　　5. The cable insulation is good, the cable head is made in a standardized manner, the color codes of each core of the cable head are correct, and the wiring with the equipment is correct. The equipment wiring terminals are not subjected to additional force.

　　四：成品保護(hù)措施

　　4： Finished product protection measures

　　1、橋架安裝后要及時覆蓋，以免落入雜物；

　　1. After the installation of the bridge, it should be covered in a timely manner to prevent debris from falling into it;

　　2、電纜放完后，要及時蓋橋架蓋板和做電纜終端頭，并加強保衛(wèi)工作，減少電纜被盜發(fā)生。

　　2. After the cables are laid, it is necessary to promptly cover the bridge cover and make cable terminations, and strengthen security work to reduce cable theft.

　　五：注意事項

　　5： Safety precautions

　　1、遵守高空作業(yè)操作規(guī)程；

　　1. Comply with safety operating procedures for high-altitude operations;

　　2、井內(nèi)作業(yè)時照度要正常，洞口要及時覆蓋，盡量避免縱向交叉作業(yè)；

　　2. When working in the well, the illumination should be normal, and the entrance should be covered in a timely manner to avoid vertical cross operation as much as possible;

　　3、電纜絕緣搖測后應(yīng)先取下紅表筆，并及時對線芯放電，且電纜頭制作的人員，必須熟悉電纜頭的制作工藝，不熟悉的人員不得進(jìn)行操作。做熱縮頭時，要先清完場內(nèi)雜物，噴燈不得對著人或易燃易爆物體。

　　3. After the cable insulation shake test, the red probe should be removed first, and the wire core should be discharged in a timely manner. The personnel who make the cable head must be familiar with the production process of the cable head, and unfamiliar personnel are not allowed to operate it. When making heat shrink heads, it is necessary to clean up the debris in the area first, and the blowtorch should not be directed at people or flammable and explosive objects.

　　4、遵守臨時用電規(guī)程。

　　4. Comply with temporary electrical safety regulations.

　　六：措施

　　6： Environmental protection measures

　　施工過程中，要隨時做到工完料凈場清，電纜盤及做電纜頭的廢料要及時清運。

　　During the construction process, it is necessary to ensure that the materials are clean and the site is cleared at all times. Waste materials from cable reels and cable heads should be promptly removed.

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