Unit boiler foundation construction scheme

Uploaded on: 2019-12-03 19:25:49 come from: Water supply and drainage / Water supply and drainage construction design / construction plan

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The 2X600000 kW unit of a power plant is designed as two boilers. The foundation is a reinforced concrete structure, and the upper part is designed as a steel structure. The relative absolute elevation of positive and negative zero meters is 1227.00 meters. The buried depth of foundation is - 5.5 meters. The foundation form is independent foundation. Embedded bolts and shear support embedded parts are set on the upper part of the foundation. Concrete mixing pile is under the foundation. The pile head is 100mm higher than the foundation cushion.

Unit boiler foundation construction scheme - Figure 1

Unit boiler foundation construction scheme - Figure 2

Unit boiler foundation construction scheme - Figure 3

Unit boiler foundation construction scheme - Figure 4

Unit boiler foundation construction scheme - Figure 5

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Technical measures for boiler foundation construction of a unit
The 2X600000 kW unit of a power plant is designed as two boilers. The foundation is a reinforced concrete structure, and the upper part is designed as a steel structure. The relative absolute elevation of positive and negative zero meters is 1227.00 meters. The buried depth of foundation is - 5.5 meters. The foundation form is independent foundation. Embedded bolts and shear support embedded parts are set on the upper part of the foundation. Concrete mixing pile is under the foundation. The pile head is 100mm higher than the foundation cushion.

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The 2X600000 kW unit of a power plant is designed as two boilers. The foundation is a reinforced concrete structure, and the upper part is designed as a steel structure. The relative absolute elevation of positive and negative zero meters is 1227.00 meters. The buried depth of foundation is - 5.5 meters. The foundation form is independent foundation. Embedded bolts and shear support embedded parts are set on the upper part of the foundation. Concrete mixing pile is under the foundation. The pile head is 100mm higher than the foundation cushion.

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1.1 A power plant has 2 × 600000 kW units, which are designed as two boilers. The foundation is a reinforced concrete structure, and the upper part is designed as a steel structure. The relative absolute elevation of positive and negative zero meters is 1227.00 meters. The buried depth of foundation is - 5.5 meters. The foundation form is independent foundation. Embedded bolts and shear support embedded parts are set on the upper part of the foundation. Concrete mixing pile is under the foundation. The pile head is 100mm higher than the foundation cushion. The minimum temperature in winter in Daihai area is minus 35 ℃, and the thickness of frozen soil layer is 1.6 meters. The groundwater level is - 2 4m.

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The 2X600000 kW unit of a power plant is designed as two boilers. The foundation is a reinforced concrete structure, and the upper part is designed as a steel structure. The relative absolute elevation of positive and negative zero meters is 1227.00 meters. The buried depth of foundation is - 5.5 meters. The foundation form is independent foundation. Embedded bolts and shear support embedded parts are set on the upper part of the foundation. Concrete mixing pile is under the foundation. The pile head is 100mm higher than the foundation cushion.

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4.6.3.1 Cement with low or moderate hydration heat shall be used to prepare concrete Use of coarse aggregate; Coarse aggregate with large particle size and good grading shall be selected; Admixtures such as fly ash are added to improve the workability of cement, reduce the water cement ratio and reduce the hydration heat. 4.6.3.2 Reduce the pouring temperature of concrete; Mass concrete construction shall not be carried out in the hot weather at noon. 4.6.3.3 After the concrete pouring is completed, the concrete shall be well insulated and moisturized to cool down slowly. 4.6.3.4 Take long-term watering for curing, determine the formwork removal time according to the specification, and delay the cooling time and speed. 4.6.3.5 Strengthen temperature measurement, temperature monitoring and management, and control the temperature change in the concrete at any time. The internal and external temperature shall be controlled within 25 ° C, and the base surface temperature difference and the base temperature difference shall be controlled within 20 ° C. 4.6.3.6 Timely backfill after the completion of the structure to avoid long-term exposure of the foundation. The concrete shall be poured in layers and vibrated compactly. The layer thickness is below 50cm of the bottom plate, and the column head should be 40cm. The upper layer concrete pouring should be completed before the initial setting of the lower layer concrete, and the lower layer should be inserted 5cm during vibration to ensure the integrity of the concrete. The concrete shall be poured from north to south in layers. The vibration shall be dense and uniform. When laitance appears on the concrete surface and the stone is not sinking, the next vibration point can be replaced. The distance between the vibrator and the formwork shall be properly controlled, and the vibration of the formwork, reinforcement and screw shall be avoided as far as possible. A horizontal construction joint shall be set at the bottom of the column head. Before pouring concrete, chisel and clean, remove loose stones, and water in advance for wetting. After pouring 5cm mortar of the same grade, pour concrete again.

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