张力架线作业指导书中英文版.doc

目 录 Chapter 1 Project Introduction3Chapter II Dead Work before stringing32.1 Personnel mobilization32.2 Material、equipment&tools preparation, inspection and test42.3 Drum Schedule72.4 通道砍伐及跨越架搭设72.5 直线塔绝缘子串及放线滑车的悬挂72.6 耐张塔放线滑车悬挂8Chapter III 导线、电缆的展放83.1 放线方式及感应电防护83.2 张力场的一般布置原则113.3 牵引场的一般布置原则123.4 人力展放导引绳123.5 张力展放导线、光缆133.6 电缆展放过程中的一些注意事项（不同于导线展放的地方）15Chapter IV 紧线施工164.1 紧线前的准备工作164.2导线耐张塔紧线174.3 导线直线塔划印184.4 压接184.5 光缆紧线及熔接21Chapter V 驰度观测及调整235.1 Introduction : Sagging Conductors235.2 Sequence of Work235.3 Methods of Checking Sag255.4 Measuring procedure of the Temperature of the conductor275.5 Insulator sags in short Dead-End (DE) spans285.6 驰度控制注意事项29Chapter VI 附件安装306.1 附件安装说明306.2 提线安装悬垂线夹316.3 耐张塔耐张线夹安装316.3防震锤的安装326.4OPGW光缆引下线及余缆、接线盒的安装336.5附件安装工器具表346.6 耐张塔、换位塔跳线安装34Chapter I Project IntroductionNorth east power transmission development project-lot C:Stringing of second circuit of kotmale-new anuradhapura 220kV transmission line,starts at kotmale substation,and goes through some earas ，such as gampola、pilimathalawa、matale、dambulla、habarana and so on, then arrivals anuradhapura substation.The total length of the line is 163.5km,and the voltage is 220kV.The line is double circuits,one of the circuits has been completed.Now,we are going to string another circuit with hot line.线路全线472基铁塔，其中耐张塔197基，其他为直线塔。 1. Site location: KOTMALE-ANURADHAPURA 2. Weather situation: muggy, rainy and the annual average max. temperature is 32.Minimum temperature is 7.Maximum temperature is 75.Wind pressure of conductor and ground lead is 970 N/mm2. 3. Topography along the line: T1T202 for mountainous regions and T202T472 for plains.。 4. Length of line: 163.5KM 5. Conductor type: 400mm2 Zebra conductor ACSR(1.632t/km),OPGW: 24 single mode OPGW(0.46t/km).The technical paticulars of conductor & OPGWACSROPGWModel400mm2 Zebra ACSROPGW - 24B1-80 76.9;43.0constructionAluminium: 54/3.18mmSteel:7/3.18mm/Cross-Sectional area(mm2)484.580.2Overall Diameter(mm)28.6212.5U.T.S (kN)130.3276.9Description Equivalent Modules of Elasticity(kN/mm2)69.0133.1315Equivalent Coefficient of Linear Expansion(10-6/)19.314.3Greased Mass (kg/km)1632460 6. Vibration Damper The Type of vibration damper for Conductor：STN The Type of vibration damper for OPGW：4D20 Damper Installation Tables123安装距离conductor400mm2 Zebra ACSRL300300L500500L800L1=1.3m;L2=L3=0.7mOPGWOPGW - 24B1-80 76.9;43.0100L250250L500500L800等距：0.58m 7. The Insulators Set本线路共计有Normal suspension set、Heavy suspension set、Jumper set、Normal Tension Set、Inverted Tension Set、Light Duty Tension Set、Inverted Light Duty Tension Set等7种串型，各型绝缘子串的绝缘子型号及数量如下表。Insulator TypeNumber of InsulatorNormal suspension setFC 120/14616Heavy suspension setFC 160/15516Jumper setFC 70/14616Normal Tension SetFC 160/15516Inverted Tension SetFC 160/15516Light Duty Tension SetFC 70/14616Inverted Light Duty Tension SetFC 70/146168. 线路相序本线路全长163.5km，换相塔位T170与T319。线路相序如下Fig 1-1：Fig 1-1 线路相序图9. 导线不允许接头要求跨越铁路、公路、河流、电力线路时，导线、地线在跨越档不允许接头。Chapter II 放线施工总体方案2.1 The Section ScheduleThe drum schedule of the project would be sectioned based on site geography, crossings, transposition, roads and accesses and tower type etc.According to the site survey, OPGW gets 42 preliminary sections and 56 for conductors.OPGW Section Schedule SECTION NO.SECTIONSUM /mSECTION LENGTH /mPULLER LOCATIONTENSIONER LOCATIONREMARKS11 TO 92324 2,324.00 1 TO 29 TO 1029 TO 216187 3,863.00 21 TO 229 TO 10321 TO3210073 3,886.00 31 TO 3219 TO 20432 TO 4515075 5,002.00 31 TO 3244 TO 45545 TO 5818814 3,739.00 44 TO 4558 TO 59658 TO 6821901 3,087.00 58 TO 5968 TO 69768 TO 7424120 2,219.00 68 TO 6973 TO 74874 TO 8928969 4,849.00 89 TO 9073 TO 74989 TO 9932154 3,185.00 89 TO 9099 TO 1001099 TO 10333543 1,389.00 99 TO 100103 TO 10411103 TO 11437588 4,045.00 103 TO 104113 TO 11412114 TO 12039608 2,020.00 119 TO 120113 TO 11413120 TO 13242729 3,121.00 132 TO 133119 TO 12014132 TO 14446587 3,858.00 143 TO 144131 TO 13215144 TO 15651074 4,487.00 143 TO 144156 TO 15716156 TO 16253383 2,309.00 162 TO 163155 TO 15617162 TO 17357987 4,604.00 161 TO 162173 TO 17418173 TO 18161633 3,646.00 180 TO 181171 TO 17219181 TO 19466774 5,141.00 180 TO 181194 TO 19520194 TO 20570970 4,196.00 205 TO 206193 TO 19421205 TO 21474454 3,484.00 205 TO 206214 TO 21522214 TO 22076585 2,131.00 214 TO 215220 TO 22123220 TO 23180513 3,928.00 231 TO 232219 TO 22024231 TO 24785982 5,469.00 247 TO 248230 TO 23125247 TO 25989950 3,968.00 259 TO 260246 TO 24726259 TO 27395171 5,221.00 259 TO 260273 TO 27427273 TO 288100054 4,883.00 272 TO 273288 TO 28928288 TO 301104697 4,643.00 287 TO 288301 TO 30229301 TO 314109165 4,468.00 314 TO 315300 TO 30130314 TO 330114542 5,377.00 329 TO 330313 TO 31431330 TO 341118807 4,265.00 329 TO 330341 TO 34232341 TO 353123699 4,892.00 353 TO 354340 TO 34133353 TO 367128557 4,858.00 352 TO 353367 TO 36834367 TO 383133760 5,203.00 383 TO 384366 TO 36735383 TO 396138437 4,677.00 383 TO 384396 TO 39736396 TO 408142208 3,771.00 408 TO 409395 TO 39637408 TO 418145706 3,498.00 418 TO 419407 TO 40838418 TO 428149150 3,444.00 418 TO 419428 TO 42939428 TO 442153672 4,522.00 442 TO 443427 TO 42840442 TO 452156989 3,317.00 441 TO 442452 TO45341452 TO 460159391 2,402.00 459 TO 460451 TO 45242460 TO GANTRY163486 4,095.00 459 TO 460472 TO GANTRYConductor Section Schedule SECTION NO.SECTIONSUM /mSECTION LENGTH /mPULLER LOCATIONTENSIONER LOCATIONREMARKS11 TO 9232423241 TO 29 TO 1029 TO 164695237116 TO 179 TO 10316 TO 216187149216 TO 17T21 TO T22421 TO3210073388621 TO 2231 TO 32532 TO 3912989291639 TO 4031 TO 32639 TO 4515075208639 TO 4045 TO 46745 TO 5016800172550 TO 5144 TO 45850 TO 5818814201450 TO 5158 TO 59958 TO 6821901308758 TO 5968 TO 691068 TO 7424120221973 TO 7468 TO 691174 TO 8226562244273 TO 7481 TO 821282 TO 8928969240789 TO 9081 TO 821389 TO 9932154318589 TO 9098 TO 991499 TO 103335431389103 TO 10498 TO 9915103 TO 114375884045103 TO 104113 TO 11416114 TO 120396082020119 TO 120113 TO 11417120 TO 132427293121119 TO 120132 TO 13118132 TO 144465873858143 TO 144131 TO 13219144 TO 152496283041151 TO 152143 TO 14420152 TO 156510741446151 TO 152156TO 15721156 TO 162533832309162 TO 163155 TO 15622162 TO 173579874604162 TO 163173 TO 17423173 TO 181616333646180 TO 181173 TO 17224181 TO 189647343101180 TO 181189 TO 19025189 TO 194667742040189 TO 190194 TO 19526194 TO 199683811607199 TO 200193 TO 19427199 TO 205709702589199 TO 200205 TO 20628205 TO 214744543484214 TO 215205 TO 20429214 TO 220765852131214 TO 215220 TO 22130220 TO 225785621977224 TO 225220 TO 22131225 TO 233805131951224 TO 225231 TO 23232233 TO 239830522539239 TO 240230 TO 23133239 TO 247859822930239 TO 240247 TO 24634247 TO 259899503968259 TO 260246 TO 24735259 TO 273951715221259 TO 260273 TO 27436273 TO 280975702399280 TO 281272 TO 27337280 TO 2881000542484280 TO 281287 TO 28838288 TO 3011046974643301 TO 302287 TO 28839301 TO 3141091654468301 TO 302314 TO 31540314 TO 3221120862921322 TO 323313 To 31441322 TO 3291143212235329 TO 330322 TO 32342329 TO 330114542221329 TO 330328 TO 32943330 TO 3411188074265329 TO 330341 TO 34244341 TO 3531236994892353 TO 354340 TO 34145353 TO 3621268793180362 TO 363352 TO 35346362 TO 3671285571678362 TO 363367 TO 336847367 TO 3741305171960373 TO 374366 TO 36748374 TO 3831337603243383 TO 384373 TO 37449383 TO 3961384374677383 TO 384396 TO 39750396 TO 4081422083771396 TO 397408 To 40951408 TO 4181457063498418 TO 419407 TO 40852418 TO 4281491503444428 TO 429418 TO 41953428 TO 4421536724522427 TO 428442 TO 44354442 TO 4521569893317452 TO453441 TO 44255452 TO 4601593912402459 TO 460451 TO 45256460 TO GANTRY1634864095459 TO 460 GANTRYWe planned to begin stringing from Anuradhapura side to Kotmale side.2.2 The Tensioner & Puller Location 2.2.1 Tensioner location 本线路张力场尽量选择布置在线路下或延长线上，并满足张力机出口与邻塔悬点高差角不大于20的要求。Tension location Area:Length along the line is not shorter than 15m,width is not shorter than 8m.Arrangements at tensioner location:one tensioner(4T),one hydraulic Drum Elevator,one crane(5T) and the drums of conductor/OPGW.The tensioner location arrangements show as the picture。 Fig 2-1 The arrangements at tensioner location2.2.2 Puller location本线路牵引场尽量选择布置在线路下或延长线上，并能满足牵引机出口与邻塔悬点高差角不大于20的要求。Puller location Area:Length along the line is not shorter than 12m,width is not shorter than 6m.Arrangements at puller location:one puller(5T)，one Drum Elevator,one crane(5T),one Adaptor for steel rope,some empty drums of steel wire.The arrangements show as the picture.Fig 2-2 The arrangements at Pullerer location2.3 导线、OPGW展放顺序本工程为双回铁塔线路，一侧带电运行的情形下，进行导线、OPGW的展放。施工时应按从上至下、先导线，后光缆的施工顺序进行。2.3.1 导线、OPGW放线段相同：按先导线，后光缆，先上后下的顺序施工。如下图，相同放线段内，先上导线、再中导线、再次下导线、最后OPGW。Fig 2-3 导线、OPGW位置示例2.3.2 导线、OPGW放线段不同：先导线1放线段、在OPGW放线段，最后导线2放线段。在单一放线段内，按2.3.1的顺序进行放线施工。Fig 2-4 放线段不同时的OPGW、导线放线示例。2.3.3 导引绳展放：导引绳采用10迪尼玛绳，按常规方法人工在张力场、放线段内各塔及牵引场间展放。2.4 放线前期准备2.4.1 牵张场道路修筑及平整：对放线段进行详细踏勘，熟悉地形地貌，掌握全线路情况。牵张机进场前，应对沿途道路、桥梁、涵洞进行检查，对路基不牢，路面不够宽应进行修筑，加固直线路面宽不小于3m，转弯不小于10m。牵张场平整：牵引场顺线路不小于15m ，横线路不小于8m；张力场顺线路不小于12m，横线路不小于6m.2.4.2 线路通道清理放线通道：放线施工前，清理线路正下方3m宽放线通道。清理要求，不影响导引绳及导线、OPGW展放为准。2.4.3 跨越物的跨越方式本工程跨越较多，交跨物有132kV、33kV、400V及以下输电配电线路、通讯线路、A级公路、B级公路、乡村公路、河流(不具备通航条件)、铁路等。根据跨越现场调查情况，采用的跨越方式主要为：A. 对A&B级公路、高度低于10m的132kV输电线路将采用跨越架封网跨越；B. 对地距离较高，无法搭设跨越架的33kV及以上线路采用停电或停电落线跨越；C. 铁路采用跨越架；D. 400V配电线路及通讯线路将直接跨越；E. 非等级公路将直接跨越，但跨越点两侧设人员监护、引导车辆通行；2.4.4 导地线及金具、绝缘子的接收、运输和保管由项目部组织接收导线、OPGW及金具、绝缘子等材料。对到货的导地线进行检查：型号、规格、长度符合设计规定；对到货的金具、绝缘子进行检查：规格、质量、数量必须符合订货清单和产品说明。导地线的装卸应使用吊车。施工运输时线盘应采取直立的方式，严禁平放，防止线盘受压变形损坏导地线。导地线存放时其线盘在地面摆放必须立放不得歪斜，地面必须平整无凸起物，两边盘沿应有支垫物。2.4.5 施工机器具的准备放线施工前应对主要机具进行检查并作试运行，张牵机、绞磨开机检查，其使用的液压油、润滑油、燃料油应准备充足。工器具表。Chapter III Stringing Conductor&OPGW With Tension3.1 Procedures of stringing conductor&OPGW with tension1、跨越架的搭设、牵张场道路修筑及平整、放线滑车的悬挂；2、分放线段人工展放导引绳（10迪尼玛绳）；3、牵张设备就位，牵引绳、导线、OPGW、运输就位；4、分放线段进行牵引绳、导线、OPGW张力展放；5、当一放线段导线、OPGW展放完，牵张场转场进行另一放线段牵引绳、导线、OPGW展放。6、同时该放线段进行紧线施工，驰度观测；及时进行附件安装、耐张塔平衡挂线。7、跨越架拆除。张力放线施工流程图见图31。(Fig 3-1)Fig 3-1 Procedures of stringing conductor&OPGW with tension3.2 放线滑车悬挂3.2.1 放线滑车的使用标准及各塔每相悬挂数量 本工程放线主要使用全塑单轮滑车，配部分接地滑车。 单轮放线滑车：轮径为660mm、轮槽宽为100mm，槽轮为尼龙制；滑轮边缘无磨损现象，转动灵活，无噪音，滑车框架、螺栓、孔无变形。转角超过30采用双滑车。接地滑车悬挂，间隔两基铁塔，挂一个接地滑车。此外，牵张设备出口，各悬挂一接地滑车。3.2.2 放线滑车悬挂对于直线塔，先将该塔的悬垂串悬挂完成后，再将放线滑车悬挂在悬垂串下方；对于耐张塔，放线滑车利用短钢丝绳悬挂在横担的挂线板处。3.3 铁塔横担临锚为防止导线、OPGW张力展放过程中，铁塔因受力不均而产生变形，对于放线段两端耐张塔外侧，进行临锚。临锚采用普通钢丝绳；铁塔上锚固在铁塔横担挂线点，地面采用6T地锚；一个地锚挂两根锚绳；3.4 人工展放导引绳3.4.1 导引绳规格：本工程导线采用的导引绳为国产10迪尼玛绳，自重为126kg/km，破断力=8.5T，每根长度为1000米；3.4.2 每个放线段导引绳展放数量：每个放线段导引绳展放4根，分别以一牵一的方式领放OPGW及各相导线的牵引绳。第一根导引绳为人工展放，其余3根，在OPGW或Conductor展放时，随OPGW或Conductor一同展放。导引绳应提前展放，及时周转。3.4.3 导引绳展放方法：导引绳分1000m一根，盘卷成200m一卷，运到指定位置，由人工向两端顺线路展放。穿越塔上放线滑车时，用人工登高引渡；各段展放完，用5T级抗弯连接器连成整体。3.4.4 导引绳展放注意事项:导引绳必须沿线路方向展放。导引绳展放后，因采用人工逐档腾空；腾空时，发现任何灌木、枝桠拌挂导引绳，先采用人工线清理拌挂物后，再腾空，严禁强拉硬拽。导引绳的绳头不得缠绕，连接必须将绳回头与本体插接，制成绳扣，再以连接器连接，插接处耐张扣插接长度不小于绳直径的15倍，且不得小于300mm。所有抗弯连接器使用前必须检查有无裂纹、变形。导引绳连接必须有专人负责，连接可靠。导引绳展放时应注意通过滑车和跨越架的情况。导引绳等待使用前应架空停放，两端锚固。否则在牵引使用前应进行检查。3.5 张力展放OPGW及主牵引绳3.5.1 OPGW张力展放展放方式：采用张力放线，直接用10迪尼玛绳做OPGW牵引绳，以一牵一的方式领放。10迪尼玛绳与OPGW连接：绳扣+5T旋转器连接+Fiber Optic Cable Head Board+5T旋转器连接+Head - Type temporary Mesh shock Joint for OPGW(OPGW终端网套)套住OPGW尾端。13 Steel RopeSwivel JointSwivel JointOPGWHead-Type temporary Mesh shock Joint for OPGWHead board for OPGWFig3-2 OPGW牵引连接示意图OPGW展放牵张系统示意图见Fig3-3Fig 3-3 Stringing OPGW with tensionOPGW放线张力控制应保证OPGW对地距离=5m，对跨越架=1m即可，且尽量采用偏小的张力。OPGW展放时的要求:a、展放前，挂线耐张塔用15钢绳封地线支架，牵张机前设钢接地滑车，沿线的接地滑车均与铁塔接地连接。b、展放时应保持施工段通讯通畅，护线人员对转角、上扬、落地（跨越架）、跳槽等情况应向牵张机司机及时预告。3.5.2 张力展放牵引绳(13抗扭钢丝绳)牵引绳规格：本工程主牵引绳采用国产13抗扭钢丝绳，六方断面，自重为610kg/km，每根长度为1000米。牵引绳本体拉断力=120KN，插接处耐张扣插接长度不小于300mm。牵引绳展放方式：采用张力展放，由迪尼玛导引绳以一牵一的方式领放牵引绳，按OPGW展放方法进行。牵引绳展放完后，应在牵张场两端锚固，以保持放线张力，张力大小以对控制点交叉物保持规定距离。 牵引展放时，张力控制应尽量采用偏小，在控制档中保证牵引绳离开地面或跨越架即可。展放时，应在各放线段设专人在观测档观测驰度，校正放线张力。3.5.3 牵引绳更换线盘更换牵引绳盘，当牵引绳盘余35圈时，牵引机停机，更换牵引盘后继续牵引。3.6 导线张力展放3.6.1 导线展放方式导线(ACSR ZEBRA 54/7/3.18)采用张力放线，由13抗扭钢丝牵引绳以一牵一的方式领放导线。牵引场：用牵引机收卷牵引绳，逐步将放线段内的牵引绳更换成导线。在导线张力展放同时，将收回的10迪尼玛导引绳绳头附在牵引绳与导线的接头处，随放线段内的导线展放，同时进行导引绳准备工作。张力场：a、将导线线轴架设在线轴尾车上，将线轴与刹车鼓盘相连，连接液压管路。b、将线轴的线头，在张力机的卷筒上缠绕五圈，左上进、右上出。c、启动张力机，使导线引出张力机5m左右，截裁整齐，扎好线头，套于终端网套锁紧。然后用5T旋转器将网套与牵引绳绳头连接。导线展放主牵张系统示意图见Fig34Fig 3-4 Stringing Conductor with tension3.6.2 导线放线张力的控制导线展放时制张力尽量偏小，张力控制应保证导线离地面3m即可，对跨越架牵引板平衡锤下端对架顶1m即可。牵张机开始工作前，应对牵、张机和导线轴架进行检查后，才能开始牵引导线，按规定调好牵引力整定值，受力后拆除牵引绳临锚，慢速牵引，并调整导线的张力使之保持平衡，当牵引板通过第一基塔后，逐步加大牵引速度，正常放线速度为4070m/分钟。3.6.3 更换导线线盘更换导线线盘：当一盘导线放到剩35圈时停止牵引，将导线固定于线架地锚上，倒出剩余导线，换导线盘后，将两导线端用接续管压接，继续展放。3.5.4 导线展放时的要求牵引前的检查a、核对已上架导线盘是否与布线一致。b、检查牵引机刹车是否可靠，以防跑线。c、检查各连接部位，如旋转连接器、抗弯连接器、绳头等有无松动隐患。牵张机牵引时的操作a、牵引过程中必须按规定的牵张力整定值，调整牵引机的牵引力和张力机的出口张力。b、牵引过程中，如牵引力突然增加，幅度达到300公斤以上时，应视为异常，及时停车，查找原因。展放导线时的护线工作a、导线展放前，拔除线盘周缘上的铁钉，展放过程中，注意检查导线发现损伤及时处理。b、在牵引作业前，沿线各监护人员应将所管区段所有障碍排除完，才能向张力场指挥人员报告，发出可牵引讯号。c、在各塔位和交叉跨越点，必须设置护线人员，密切监视放线情况。3.6.5 放线质量和施工安全张力放线过程中防止导线磨伤的措施：a、吊运、架设线轴时应保证线轴不变形，拆除线轴包装时应用不损伤导线的工具，拔除线轴外缘上所有铁钉。b、换线轴时，注意线头、线尾不与张力机、线轴架的硬、锐部件接触。c、向线轴回余线时，若连接网套被盘进线轴，应在连接网套和导线间垫一层隔离物，如麻袋等。导线展放施工安全应注意：a、连接网套、牵引板、连接器、导引绳和牵引绳的插接式绳扣是张力放线的薄弱环节，每次使用前应严格检查，按规定方式安装和使用。b、牵放过程应在下列部位设专人负责：牵引场及张力场，并在张力场设现场总指挥；各放线滑车处，尤其是转角滑车处；所有跨越架及导线离地面最近处；居民区，未搭越线架但通行行人的乡间道处。c、施工现场通讯应畅通:各岗位工作人员应掌握通讯工具的使用；选择可靠的通讯工具；通讯语言应简明、明确、统一、清晰；通讯岗位缺岗不得进行牵引作业。d、张力放线应有防止电害的措施：牵引机、张力机机体应接地；在牵引机、张力机前的牵引绳和导线上安装接地滑车；操作人员应站在干燥的绝缘板上操作牵张机，站在地面上的人员不得与操作人员接触；被跨越的电力线路两侧的放线滑车接地；雷雨天应停止放线工作；停电作业应严格按停电操作规定进行。Chapter IV 紧线施工4.1 紧线方式4.1.1 紧线方式 根据本文2.1放线段划分，本工程采用耐张塔耐张塔放线方式，紧线施工也将采用耐张塔耐张塔的紧线方式。紧线时，若放线段内存在多个耐张段，则同一耐张塔两侧，一侧通过耐张串及压接完成的耐张终端头，将导线挂在铁塔横担挂线点上，铁塔的另一侧利用绞磨及滑车紧线；4.1.2 紧线方法紧线前的准备工作：a、检查直线压接管的位置，如不合适，应处理后再紧线；b、检查导线损伤情况，视损伤程度按技术要求处理完毕（补修管可在紧线后处理）；c、核对弛度观测档的位置，复测观测档档距高差，核对绝缘子串及金具长度，设立观测标志；d、紧线时在耐张段（紧线段）两端应保留接地，并随时检查接地是否良好。e、在紧线塔处，埋设6T锚桩，便于布置机动绞磨。紧线方法：在紧线塔布置5T机动绞磨，用“一牵一”紧线法对导线紧线。牵引系统采用采用5T走二滑车组布置。紧线的步骤1) 在耐张塔将导线通过卡线器、滑车组和紧线设备连接。2) 启动机动绞磨，收紧导线，拆除临锚。3) 继续收紧导线至一定张力，牵完余线后，慢速牵引，进行驰度观测及调整（调整时在导线尾部用钢绳做保险）。4) 弛度达标后将导线在塔上再次临锚。4.1.3 紧线中注意事项紧线时导线受力后应拆除所有临锚，导线接近驰度时停止牵引，待导线稳定后进行驰度粗调，采用紧松紧方式由后向前逐档调整，然后用5T手扳葫芦、锚绳将导线临锚用手扳葫芦对驰度进行细调。紧线过程中应监视各地锚情况，有异常应停止紧线，并再次临锚，处理异常后继续。紧线后应及时安装附件。紧线过程中，监护人员应遵守下列规定：不得站在悬空导线、地线的垂直下方；展放余线人员不得站在线圈内或线弯的内角侧；不得跨越将离地面的导线或地线；监视行人不得靠近牵引中的导线或地线；传递信号必须及时、清晰；不得擅自离岗；紧线应使用卡线器，卡线器的规格必须与线材规格匹配，不得代用。4.2 驰度观测及调整4.2.1 Introduction : Sagging Conductors The amount of sag in each conductor should be accordance with stringing sag (initial sag) tables approved by the Engineer.The sag of any one conductor shall not deviate more than 150mm from the sag of the line conductors in the span.The temperature should be obtained each time a sag is made by an accurate centigrade thermometer inserted in a short sample length of conductor and suspended freely in the open air at a height of not less than 1.5m above the ground.If line is passing through hilly terrain we have to adopt different type of sag observation methods as illustrated in Fig. A. One of the six methods described in sub paragraphs will be used to determine the sag conductors.根据设计文件及业主要求，导线按降温20，OPGW按降温0控制弧垂。OPGW调整弧垂，须在OPGW展放完成7296 hours内完成。4.2.2 Sequence of Worka. Sag adjusting is made by Tirfor / Hand-Winch through wire ropes and snatch blocks equipped between come-along clamps and cross-arm tension plate.b. Sag observation will be made in a manner in Fig A Case 1 through 5 in accordance with the configuration of the site. The method in case of uplift condition is given in Case 6.c. After final adjustment of the sag measurement, the conductor is cut to the measured length and compressed with a tension clamp, and terminated to the tower or the tension insulator strings.d. Suspension insulator sets will be adjusted in consideration of clipping off-sets so that the strings will be vertical within 20mm.4.2.3 Methods of Checking Sag - Case 1Supports at equal or unequal elevations and lower point of sag above bases of supporting structures:a. From the structure list ascertain the horizontal distance between the two structures where the sag measurement is to be made.b. Obtain the required sag D corresponding to the span and the ambient temperature.c. At one end of the span, mea