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第136章 下井

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    第136章下井(第1/2页)
    陆维桢合上笔记本后,在操作台前坐了片刻,然后站起身走向设备架,打开了储物柜的柜门。柜内的管道内窥探测器箱体保持着上一次检查时的位置,箱盖封条完好。他没有取出探测器,而是从柜子底层抽出了一只小型工具袋,里面装着一支手持式照明灯、一把绝缘手套和一只带钩头的伸缩杆。他把工具袋的拉链拉好,挎在肩上,然后从设备架上取下一台便携式检测终端,确认了电量显示为满格,关闭屏幕,装进工具袋侧面的夹层里。他在员工通道入口处站了约半分钟,然后推开门走进了夜色。
    夜间的气温比白天低了约四五度。他沿着园区内部道路向北侧围墙方向走了一段,在围墙外侧的人行道上加快了脚步,路灯在路面上投下一段段间隔分布的光斑和暗区。经过围墙上的观察点时他没有停留,继续沿着行道树的树影边缘移动,直到接近物流园中继器配电箱后侧的灌木丛位置时,他停下脚步,从工具袋里取出照明灯,但不打开光源,而是蹲在灌木丛的阴影里先观察了片刻。
    配电箱的轮廓在夜色中保留着白天观察到的形态,后侧的硬化地面被路灯从侧面投来的余光部分照亮。配电箱底部安装板边缘与地面之间有约四指宽的缝隙,缝隙处的光线比周边更暗。通信检修井的井盖位于配电箱东南侧约一米处,井盖表面在路灯余光下呈深灰色,铸铁纹理的凹凸在低照度条件下反射出微弱的金属光泽。他在灌木丛的阴影里蹲了将近一分钟,确认了配电箱周围没有任何人员或车辆接近的迹象,然后从灌木丛中起身,走向通信检修井的位置。
    他在井盖旁蹲下,把照明灯放在地面侧边,灯光朝下,用手掌和手指遮挡了直射向配电箱方向的光线。井盖边缘与井圈之间的接缝完整,密封胶条的边缘部分轻微老化,但整体完好,没有明显的损坏或撬动痕迹。他用钩头伸缩杆的尖端探入井盖边缘的开启孔内,调整了杆头的角度,施加了一个向上的力,井盖发出一声轻微的金属摩擦声后,沿井圈边缘的导向槽抬起了一条缝隙。他把井盖移到旁边,靠在井圈外侧的地面上,让井口完全暴露出来。
    井内壁的混凝土表面附着了一层浅灰色的灰尘,没有明显的苔藓或渗水痕迹。井底的干燥程度比上次在检查井内观察时更高,底部没有积水,只有一层薄薄的浮土。他用手持照明灯扫视了井壁内表面,很快确认了图纸上标注的预留管道接口位置——在井底东侧,与配电箱底部的相对位置对应。预留管道接口的管口被一块金属盲板封住,盲板边缘有三颗螺栓固定在管口法兰上,螺栓表面涂着一层与盲板颜色一致的漆,漆层完好,没有看到近期拧动的痕迹。
    他蹲在井口边缘,调整照明灯的角度使光线照到盲板表面,逐颗检查了三颗螺栓的状态。螺栓的十字槽内没有堆积灰尘,十字槽的边缘干净利落,棱线分明。他在井口蹲了一会儿,取出手机拍了一张盲板的照片,然后从工具袋里取出伸缩杆,将杆头的钩子伸入盲板边缘与法兰之间的缝隙,轻轻向外拉动,盲板在受到拉力作用后略微向外位移了一小段,然后停住了。他把伸缩杆收回,取下绝缘手套,用手电的灯头贴近盲板边缘位置重新观察了一下缝隙的宽度,发现盲板边缘有一小段油漆剥落,露出的金属断面颜色呈现为较深的铁灰色,没有锈蚀,与周边老化漆面的颜色形成了轻微的差异。
    (本章未完,请点击下一页继续阅读)第136章下井(第2/2页)
    他后退了半步,在井口边坐下,把照明灯放在身边,然后从工具袋里取出便携式检测终端,打开屏幕,把拍到的盲板照片和螺栓状态记录输入终端。他写道:“通信检修井底部的预留管道接口表面覆盖一层金属盲板,用三颗螺栓固定在法兰上。盲板漆层整体完好,边缘处有一小段油漆剥落,露出的金属颜色较浅,推测为近期应力造成的局部剥落。漆层剥落的时间点可能与近期井盖被开启或该处受到外力作用有关。”
    他把终端收回工具袋夹层里,站起身,把井盖沿导向槽推回原位,用脚确认了井盖与井圈之间的缝隙均匀后,退回了灌木丛的阴影中。他在灌木丛边缘又蹲了一会儿,直到确认配电箱周围没有出现新的声音或光线变化,才沿着原路穿过人行道和围墙边缘,重新回到员工通道内。通道内的感应灯在有人经过时依次亮起,在他身后依次熄灭。他回到地下三层后,在操作台前坐下,把工具袋放在桌边,取出便携式检测终端,再次打开了盲板螺栓近景照片,放大后仔细检查了螺栓十字槽的边缘状态。
    十字槽内部没有附着灰尘,棱线清晰,表明螺栓在近期被工具接触过。十字槽表面的漆层有不均匀磨损,集中在槽口中心区域,与螺丝刀头多次旋拧时产生的接触特征一致。三颗螺栓的槽口磨损程度不一致——第一颗磨损较浅,第二颗和第三颗磨损较深,且在第三颗螺栓的十字槽一侧
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