综合复习：D1 计算专项 · 情景应用 | Review: D1 Calculations · Scenario in Action

本课目标 | Learning objectives

1. 按三步走完一个场景，并说出每一步的依据
2. 区分「更有效」与「更先做」两类答案
3. 把结论写回自己的术语表

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场景走一遍 | Walk the scenario

检修工需在一台 6 米高平台下方作业区穿行，平台边缘设过头顶锚点：锚点比工人背部 D 环高出 1.2 m，系 1.8 m 缓冲系绳，缓冲包标称展开上限 0.6 m；工人 D 环距鞋底 1.4 m。厂内另一侧有一台机械压床，制动与响应总时间 T 总 = 0.15 秒，现装双手光电保护，需核定光幕到模具的安全距离。两个数字都要算。

A maintainer walks below a six-meter platform with an overhead anchor 1.2 meters above his back D-ring, an 1.8-meter deceleration lanyard rated to deploy 0.6 meters, and a D-ring 1.4 meters above his shoes. Across the plant, a mechanical press with total stop time of 0.15 seconds has a light curtain; the distance from curtain to dies must be verified. Two numbers to compute.

1. 第一步：坠落净空四项相加——自由坠落 = 1.8 − 1.2 = 0.6 m；缓冲 = 0.6 m；D 环到鞋底 = 1.4 m；余量取 1.0 m → 净空 ≥ 3.6 m。核对穿行区地面到平台底的实际净空是否 ≥3.6 m；不足则升级控制（缩短系绳、改用 SRL 或禁止穿行），不能靠「小心点」。 — Step 1 — add the four clearance terms: free fall 1.8 minus 1.2 equals 0.6 m; deceleration 0.6 m; D-ring-to-shoe 1.4 m; margin 1.0 m — clearance of at least 3.6 meters. Verify the actual space below the platform; if short, upgrade the control — shorter lanyard, an SRL, or no walking below — never 'be careful'.
2. 第二步：安全距离 Ds——Ds = 63 in/s × 0.15 s ≈ 9.5 英寸（≈24 cm），大于 7 英寸最小值，有效；光幕到模具边缘的实际距离必须 ≥9.5 英寸，且每次维修更换模具后复测 T 总（模具不同停 时间不同）。注意单位：题目若给厘米，先换算再比。 — Step 2 — the safety distance: 63 in/s times 0.15 s is about 9.5 inches, above the seven-inch floor and valid; the curtain-to-die distance must meet it, and stop time gets re-measured after every die change. Watch units — convert centimeters before comparing.
3. 第三步：把两个计算沉淀成现场规则——净空结论写进作业区划线与警示（禁行区宽度按 3.6 m 反推）；Ds 结论写进压床点检表（每次换模后测 T 总并核对 63×T）；两题的口算卡入库：特征词「过头顶锚点/换模后」→ 公式 → 量级（3.6 m、9.5 in），每周晨会抽问。 — Step 3 — turn both numbers into site rules: mark the no-walk zone from the 3.6-meter clearance; put Ds into the press checklist with a stop-time test after every die change; and file both drill cards — trigger words, formulas, magnitudes — for weekly toolbox quizzing.

走完这三步再往下答题；答案不是背出来的，是按步骤推出来的。/ Work the three steps before answering — the answer is derived, not recalled.

情景自测 | Scenario check

情景判断Scenario judgement

这道题考什么：考净空计算与单位纪律。
Tests clearance math and unit discipline.

本案坠落净空计算中，自由坠落距离是？

The free-fall distance in this case is?

自编练习题，不是 BCSP 官方真题，也不能用来预测分数。 / Original practice item, not an official BCSP exam question.

动手练 | Practice

1. 把你现场一处锚点按四项法算一次净空并现场核对。
Compute clearance for one real anchor and verify on site.

学习打卡与笔记 | Progress & notes

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可靠来源 | Official references

BCSP — CSP Examination Blueprint (CSP11)

BCSP — Official Self-Assessments

BCSP — Certified Safety Professional (CSP)

Pearson VUE — CSP 考试预约 / Scheduling

本课为一般性学习资料，不替代现场专业评估、法规要求或组织程序。/ Educational content only.