开挖作业安全
一、开挖基础 | Excavation Fundamentals
二、土壤分类与坍塌防护 | Soil Classification & Collapse Prevention
三、防护系统 | Protective Systems
四、开挖安全作业 | Safe Excavation Practices
五、机械设备安全 | Equipment Safety
场景一：电缆沟开挖每日检查 Cable Trench Daily Inspection Morning inspection of the MV cable trench — Zone B to Substation, 2.4m deep × 1.2m wide, Type C sandy soil. Supervisor, show me your daily checklist.
晨检中压电缆沟——B区至升压站、深2.4m×宽1.2m、C类砂质土。 主管、给我看日检表。
(hands over clipboard) Checked at 07:15 this morning. Item 1 — soil condition: no cracks, no water seepage, no signs of sloughing at the trench walls. We had light rain overnight — 3mm — I measured it. Item 2 — shoring: trench box installed, extending 300mm above grade, no gaps between box and trench wall. Item 3 — spoil pile: located 1.2m from the trench edge, exceeding the 0.6m minimum. Item 4 — access ladder: one aluminum ladder at each end — 7m spacing, within the 7.5m maximum. Ladders extend 1m above landing. Item 5 — barricades: orange barrier mesh on three sides, the fourth side is the access end with a removable gate. Item 6 — atmospheric test: O₂ 20.9%, LEL 0%, CO 0 ppm, H₂S 0 ppm — no engine-driven equipment in the trench, all pumps are electric.
(递记录板)今早07:15查的。项1——土壤条件:无裂缝、无渗水、沟壁 无剥落迹象。昨晚小雨——3mm——量过了。项2——支护:箱式支护安装、超 出地面300mm、箱与壁间无间隙。项3——堆土:距沟边1.2m、超过最低 0.6m。项4——进入梯:两端各一铝合金梯——间距7m、在最大7.5m内。梯 顶超出平台1m。项5——护栏:三面橙色隔离网、第四面是入口端带可拆卸 门。项6——大气检测:O₂ 20.9%、LEL 0%、CO 0ppm、H₂S 0ppm—— 沟内无引擎设备、全部水泵为电动。
Let me verify physically. (checks trench box) Box is seated correctly — bottom pins engaged. (checks spoil pile) 1.25m setback — confirmed. (enters trench) Ladder is secure. Bottom of trench is dry — dewatering pump is working. Walls are vertical, no undercutting. I'm satisfied. One observation: the dewatering hose discharges 0.5m from the trench edge. That water needs to be directed at least 2m away or it'll saturate the soil and increase collapse risk. Re-route the discharge hose before work starts.
物理验证。(查箱式支护)箱就位正确——底销啮合。(查堆土)1.25m距 离——确认。(进入沟内)梯稳固。沟底干——排水泵在工作。壁面垂直、无 掏蚀。满意。一个观察:排水软管在沟边0.5m排放。那水要导到至少2m外、 否则会饱和土壤增加坍塌风险。开工前改排水管路由。
场景二：燃气管道交越——人工探坑 Gas Pipeline Crossing — Hand-Dig Potholing
We've located the 300mm high-pressure gas main running east-west at approximately 1.8m depth, crossing our cable trench route. The utility maps show it, and we've verified it with ground-penetrating radar. The permit requires hand-dig potholing to expose the pipe before any mechanical excavation within 3m. We need to expose the pipe at both sides of our trench line.
已定位东西走向300mm高压燃气主管、约1.8m深、穿越我们电缆沟路 由。管线图有显示、用探地雷达验证过了。许可要求在3m范围内机械开 挖前人工探坑暴露管道。需在我们沟线两侧暴露管道。
This is a live high-pressure gas main — a strike here is a potential fatality and a community evacuation event. I'm approving the hand-dig permit with additional controls. First: the gas company's representative must be on site during all excavation within 3m of the pipe — not just notified, present. Second: the hand-dig crew uses only non-sparking tools — fiberglass shovels, brass picks. No steel tools within 1m of the pipe. Third: a calibrated gas detector is positioned at the excavation point and monitored continuously. If methane registers above 10% LEL, everyone evacuates to the assembly point 100m upwind. Fourth: no mechanical compaction or heavy equipment within 5m of the exposed pipe. Fifth: once the pipe is exposed, it must be supported — a sling with longitudinal timber cradle — before any trench work underneath. Supervisor, acknowledge these five additional controls.
这是运行中的高压燃气主管——一次打穿就是潜在死亡和社区疏散事件。 批准人工探坑许可、加附加控制。一:燃气公司代表必须在3m内管道全部 开挖期间在场——不只是通知、要在场。二:人工探坑班组只用无火花工具—— 玻璃纤维铲、铜镐。1m内无钢质工具。三:校准气体检测仪置开挖点连续 监测。甲烷超10%LEL、全部撤至100m上风集合点。四:暴露管道5m内无机 械压实或重型设备。五:管道暴露后须支撑——吊带加纵向木托——之后方可 在下方进行沟槽作业。主管、确认收到五条附加控制。
Acknowledged all five. I've already contacted the gas company — their inspector will be here at 08:30. The non-sparking tool kit is in my truck. Gas detector bump-tested at 06:00. I'll brief the hand-dig crew now and we start at 08:30 when the gas company rep arrives.
全部五条确认。已联系燃气公司——他们检查员08:30到。无火花工具 包在车上。检测仪06:00做了碰触测试。现在向探坑班组交底、燃气公司 代表到了08:30开工。