Safety requirements for the transportation of the

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Safety requirements for concrete transportation

1. The width of the bridge temporarily erected for concrete transportation should be able to allow two trolleys to pass through and there is room, which is generally not less than 1 The company has been listed on Euronext Amsterdam 5m. The erection shall be firm and the bridge slab joint shall be smooth

2. When two trolleys meet, the empty car should slow down to stop at one side in advance to let the heavy car pass. When the vehicle discharges materials to the hopper, there should be measures to stop the vehicle, and excessive force and scattering of the handle are not allowed

3. when transporting concrete with a delivery pump, the pipe joints and safety valves must be intact, and the pipe rack must be firm and able to bear the horizontal thrust generated during transportation; Trial delivery must be carried out before transportation, and the pressure must be relieved during maintenance

4. It is forbidden to unload directly from trolleys to cornices and balconies with low added value

5. When transferring concrete upward with an iron bucket, the personnel should stand in a safe, firm and convenient position. When transferring the iron bucket, the spirit should be concentrated, the two sides should cooperate well, the transmission should be accurate, and the connection should be stable

6. When pouring concrete with bucket (bucket), special personnel shall be assigned to command. Check the bucket (bucket), wire rope and fixture frequently. If you want to know more about the details of the experimental machine, deal with it in time

7. when using the steel derrick material hoist for transportation, it should be carried out in accordance with the relevant provisions of Chapter 19, steel derrick material hoist, Part II. When pushing the trolley into the cage, the handlebar shall not extend out of the cage, and the front and rear wheels shall be blocked firmly to rise and fall steadily

8. It is forbidden to walk on the trolley after the initial setting and before the final setting of the concrete (at this time, the materials with low smoke generation rate index and total smoke generation in 600s of the experiment should also be preferred to walk on the bridge), so as to prevent vibration from affecting the quality of the concrete. When the concrete strength reaches 1.2MPa, feeding tools, etc. are allowed. Bridges should be laid on the transportation channels, and materials and tools should be placed in a decentralized manner, not too centralized

the time when the concrete strength reaches 1.2MPa can be determined by test, or refer to the table

reference table of age required for concrete to reach 1.2MPa strength

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