Technical Scheme for Cleaning Fly Ash Storage Silo

Engineering Overview

The inner wall of the fly ash silo and the bottom of the storehouse are consolidated. This is due to the bottom of the gasification board homogenization device leading the bottom discharging hole in poor feeding, which seriously affected the normal production needs. In view of the above situation, combined with many years of similar projects for the construction technology and experience, to ensure that all the remaining material in the silo all clean-up to outside, proposed the following construction program.

Construction Technology Measures

Because of the repository is running for long periods of time, leading to the accumulation of block at the end of the block formation. First of all, construction workers need to enter the silo from the top, check the remaining material in the silo and material harden degree. Use air gun first air entrained in the bottom of the silo, homogenization of the rolls of material. Make the material flow to itself, if the effect is not achieved, construction workers will began from the storage side of the door, install the chute unit on the side door, so that the rest of the silo material can flow smoothly from the silo to the tank. (If there is any block material, the block material must be moving outside the silo. Party A shall arrange transportation to move the block material to somewhere else, to prevent the normal construction of construction units) If the discharging holes can’t work, we have to install a temporary discharge chute for cleaning up material discharging. Clean up the material from silo, until come out the pressure cone in silo. Then open 400mm×500mm hole at pressure cone, to convenient construction workers dredge the discharging hole under the silo.

Construction workers must take safe protection measures and their own protection, and then can enter the silo construction. Construction workers before enter the silo, using Φ18 brown rope or Φ18 nylon rope as the construction of the insurance rope. Secure the end of the rope to the top of the silo, the other end of the insurance rope tied to the waist of the construction workers. For construction safety, tied another 10 meters of Φ18 brown rope or Φ18 nylon rope to the waist of the construction workers, to protect the safety of construction workers in the construction process, ensure the safety of construction workers when enter the silo. Firstly construction workers enter the silo bottom, secure the other end of the safety harness to the waist. After finished the double insurance, construction workers should check the distribution of fouling in the silo, construction workers outside the silo put the construction tools into the bottom of the silo with Φ12 brown rope. After construction workers checked the distribution of fouling in the silo, find the high point of remaining material close to the side, then take the top to bottom of the construction process to gradually clean up. When remaining material are cleaned in same level with the silo door, other construction workers can enter the silo from the little door in bottom of the silo, clean up all the remaining materials in silo. When into the silo for construction, use walkie-talkie as communication tool.

Construction Safety Measures

• The project takes suspended work, implementation of the "safety first, prevention first" approach, all operators must operate in strict accordance with high-altitude operating procedures.
• Before the construction of this project, by the Part A safety supervision department of the construction site safety operation training.
• The person in charge of Party B of this project is the person in charge of safety, with a security officer, responsible for the construction of high-altitude security and construction of ground safety. All construction worker of Party B must obey the leadership of Party A's safety supervision department, supervision of safe construction. For violation of safety of construction worker, have the right to punishment.
• Daily before the job, workers need to do the safe operation technology work.
• Equipment of Party A in the construction area, need to set up protective facilities according to requirements, it is forbidden to touch all the facilities of Party A.
• Construction of all equipment, lifting and rope, must pass the test, before entering the silo construction.