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Prefabricated floor board
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Prefabricated floor board

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Prefabricated reinforced concrete floor slab is prefabricated floor slab in factory or on site, and then manually or mechanically hoisted to the building through grouting and seaming.This method can save template, improve working conditions, improve efficiency, shorten the construction period and promote the industrialization level.But the integrity of the prefabricated floor is not good, the flexibility is not as good as the cast-in-place slab, and it is not suitable to puncture the floor slab.

The reinforced concrete floor slab which is often chosen has two kinds: ordinary type and prestressed type.

The ordinary type is to put the reinforced bar at the bottom of the plate, and to ensure that it has enough protective layer, pouring concrete, and by curing.As a result of the ordinary plate in the bending than the prestressed board crack first, so that the steel corrosion, thus the span is small, only used as a small accessories in the building.

The prestressed type is to apply pressure in advance to the tensile area of the floor slab to delay the cracking time of the tensile area of the slab after bending.

At present, the pre-tensioning method is often used to establish the prestress of the prestressed reinforced concrete floor, that is, the force bars in the tensioning plate on the tensioning platform first, so that the steel bar has the required elastic retraction force, pouring concrete and curing, when the concrete strength reaches the specified value, the steel bar is cut off, and the retraction force of the steel bar to the tensile area of the board to exert the pre-pressure.Compared with ordinary reinforced concrete members, prestressed reinforced concrete members can save 30% ~ 50% of steel and 10% ~ 30% of concrete, so they are widely used.

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Intersection of Sanyi Street and Renhe Road, Eastern Development Zone, Pingyuan County, Dezhou City, Shandong Province

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Time of issue:2020-12-29 13:52:21

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