Construction technology of reinforced concrete chimney lining and insulation layer - Chinahours

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(1) Lining and heat insulation materials shall be selected strictly according to the design and use requirements during construction. The inner lining of the cylinder body shall have the functions of wear resistance, heat insulation, corrosion resistance and protection of the heat insulation layer. The material of the inner lining is based on The dust properties of the flue gas and the properties and content of the flow rate, temperature, humidity and corrosive gases are designed. The lining blocks and ash joints must meet the requirements of flue gas. The material capacity, thermal conductivity, heat limit and Corrosion resistance requirements, to ensure the quality of the gray joint, reduce the smoke and temperature from the gray joint into the insulation layer, investigate the vertical cracks in the existing chimney wall, mostly due to the thermal insulation properties of the insulation in the chimney In the event of failure during operation, the wall of the cylinder is heated and overheated, causing the vertical wall to rise. Therefore, the performance of the lining and insulation materials should be guaranteed during construction, meet the design requirements, and be special in the transportation, storage and construction of materials. Pay attention to rain, moisture, moisture, and do not change the performance of the insulation material.

(2) All the linings and insulation materials (all kinds of lining block bricks, refractory mud, acid-resistant mortar and heat insulation materials) that are transported to the construction site must have quality control on the incoming materials, and must have product certification. And the technical specifications, and after passing the on-site inspection and acceptance, can enter the construction site, and provide technical identification and inspection certificate and use report for the new materials.

(3) The surface of the annular cantilever supporting the lining shall be smoothed with 1:2 cement mortar, and the horizontal deviation shall not exceed 20 mm.

(4) The lining shall be layered and masonry. The crevices of the masonry shall be full. The fullness of the horizontal ash joints of ordinary clay bricks shall not be less than 80%; the clay refractory bricks and the acid-resistant bricks shall be horizontally creased. The fullness of the fullness shall not be less than 90%, and the vertical gray joints shall be filled with grouting and adding methods to make the gray joints full.

(5) When the thickness of the inner lining is 1/2 brick, the application is made of bricks, and the half bricks are interlaced with each other. When the thickness is one brick, the top bricks are used for construction, and the bricks are interlaced by 1/4 brick.

(6) The gap between the wall of the cylinder and the lining shall be prevented from falling into mud or brick. If it is necessary to fill the insulation, it shall be filled once after 4 to 5 layers of bricks are laid in the lining. The insulation shall be Fully filled, when it is loose insulation, it should be guarded on the inner material

6. When constructing the wall of the tube, a flexible connector is installed every 10m between the tube wall and the steel tube shaft erection, and a protective shed is set every 20m.

7. Fences and barbed wire shall be provided around the operation platform, and safety nets shall be provided on the internal and external lifting ladders.

8. In the vertical and vertical holes of the shaft, the wire protection net should be installed to prevent the cage from hurting when running up and down.

9. The hoist for lifting the cage shall be equipped with a stopper to prevent roofing and squatting. In order to prevent the rope from breaking suddenly, the cage shall be equipped with a brake. The stopper and the safety brake shall be regularly inspected during construction to prevent malfunction. .

10. Voltages used in aerial work, such as vibrators, lighting, signals, etc., should be used with voltages not greater than 36V.

11. At night construction, console, internal and external lifting ladder, shaft derrick, hoisting machine room, mixing station and various transportation road pens

There must be sufficient lighting facilities.

12. Sound and light signals and communication equipment should be installed between the bottom of the chimney, the console and the hoisting machine room.

1 3. When there is more than six winds or thunderstorms on the console, all high-altitude operations must be stopped. The construction personnel should go to the ground at the speed of the signal and cut off the power.

14. Fire extinguishers shall be provided on the operating platform and at the bottom of the chimney. Sink belt.

(7) The inner surface of the inner lining shall be jointed, and the local unevenness on the surface of the inner lining shall be uneven, and shall not exceed 30 mm in the radial direction.

(8) Mixing of citric acid clay, acid-resistant mortar and acid-resistant concrete, pouring masonry and curing, all should be carried out at a temperature not lower than 15 °C. Waterproof, rainproof and unaffected by sudden temperature changes must be taken during construction.