Table 3.
Standardised unsafe actions in subway construction
| Code of unsafe action | Unsafe actions | Number of unsafe actions |
|---|---|---|
| UA1 | Insufficient safety warning signs | 2 |
| UA2 | Irregular binding of lifting objects | 12 |
| UA3 | Improper parking of large full-load platform vehicle | 1 |
| UA4 | Soldering terminal exposed in welding machine | 1 |
| UA5 | Welder terminal without protective cover | 2 |
| UA6 | Welding rod not removed after welding machine used | 2 |
| UA7 | No secondary no-load protector for welding machine | 1 |
| UA8 | Illegal use of socket in welding | 2 |
| UA9 | More damaged cable joints | 3 |
| UA10 | Cable is not fixed overhead | 7 |
| UA11 | Overlapping objects on cable lines | 5 |
| UA12 | Irregular arrangement of lifting objects | 12 |
| UA13 | Lifting operation is still performed in poor weather | 4 |
| UA14 | Nonstandard wearing of protective articles | 39 |
| UA15 | No protection for platforms work at heights | 10 |
| UA16 | Workers take a shortcut during lifting operations | 8 |
| UA17 | Fire welding bucket in welding operations | 1 |
| UA18 | Mechanical equipment without protective devices | 18 |
| UA19 | Foundation pit over-break | 1 |
| UA20 | Excavation of foundation pit is too steep | 1 |
| UA21 | Irregular tie between frame and building structure | 10 |
| UA22 | Inspection and maintenance are not timely | 6 |
| UA23 | Scaffold operating platform not fully fixed | 3 |
| UA24 | Standing water on the scaffolding floor | 1 |
| UA25 | Scaffold bottom bar is not connected | 3 |
| UA26 | Upright stanchions of scaffold do not meet the specification | 3 |
| UA27 | Upright stanchions of scaffold hang in the air | 1 |
| UA28 | Sweeping rod of scaffold is not connected | 4 |
| UA29 | External scaffold bolts are not tightened | 4 |
| UA30 | Crossing the armrest | 2 |
| UA31 | Crossing the guardrail | 4 |
| UA32 | Template erection is uneven and irregular | 7 |
| UA33 | Inspection record of distribution box is incomplete | 5 |
| UA34 | Illegal socket in distribution box | 7 |
| UA35 | Illegal wiring of distribution box | 10 |
| UA36 | Distribution box is not grounded | 4 |
| UA37 | Distribution box without responsibility card | 6 |
| UA38 | Damage of distribution box body | 3 |
| UA39 | Partial shedding during spraying operation | 2 |
| UA40 | Operate when the crane is unstable | 9 |
| UA41 | Crane overloading | 8 |
| UA42 | Cleaning the working concrete mixer | 1 |
| UA43 | Use equipment without acceptance | 8 |
| UA44 | Illegal accumulation of earthwork | 1 |
| UA45 | Illegal accumulation of clutter | 9 |
| UA46 | Illegal reinforcement welding operation | 1 |
| UA47 | Illegal entry into dangerous areas | 17 |
| UA48 | Leakage protector not installed or malfunction | 4 |
| UA49 | No wall stabilisation measures | 2 |
| UA50 | Work without valid certificates | 10 |
| UA51 | Climbing without permission | 4 |
| UA52 | No safety helmet | 10 |
| UA53 | No fire extinguisher | 2 |
| UA54 | Operate without signal operator's command | 7 |
| UA55 | Oxygen cylinders are placed upside down | 1 |
| UA56 | Insufficient spacing between oxygen and acetylene cylinders | 1 |
| UA57 | One gate for multiple machines | 6 |
| UA58 | Acetylene bottle without backfire prevention device | 1 |
| UA59 | Pressure gauge of acetylene bottle is damaged | 2 |
| UA60 | Relying on the guardrail | 4 |
| UA61 | Sleep in the construction area | 6 |
| UA62 | Smoke in the construction area | 3 |
| UA63 | Standing on a concrete mixer truck at work | 2 |
| UA64 | Loaders carry people illegally | 3 |
| UA65 | Unqualified protective measures for operating platform | 19 |