Prestressed concrete strand storage and use


1. Prestressed concrete strand storage method:

Steel such as Prestressed concrete strands should be stored in a dry warehouse. In the open air and on-site storage, sleepers should be installed on the ground. It is strictly forbidden to directly contact the wet ground, and the tarpaulin or the rainproof shed should be covered to minimize the storage period. The special environment should be rust-proof packaging in the order. The appearance of prestressed steel rust does not affect the use, but rusting into the visual "pit pit" will affect its mechanical properties.

2. Prestressed steel lifting:

The hoisting of prestressed steel should be hoisted in order, orderly and leave a gap. Unbonded prestressed tendons should be hoisted in parallel with three brown rope grommets. It is strictly forbidden to hang directly with steel wire rope. Rolled steel strands use forklifts or special lifting tools to prevent breakage of steel strips.

3. Prestressed concrete strands are used:

1. It is strictly forbidden to use any conditional heating deformation measures in the use of prestressed steel to avoid reducing the mechanical properties of prestressed steel.

2. It is strictly forbidden to weld during use. Because the strength of the solder joint is much lower than the strength of the steel itself, it is easy to cause broken wire at the solder joint in the tension.

3. The cutting of prestressed steel should use the toothless data (grinding wheel card). The use of electric and gas welding cutting can easily damage the appearance of the steel. At the same time, the end is locally heated, so that the performance is significantly reduced.

4. When the prestressed steel wire adopts the circulating reinforcement, its bending radius shall not be less than 3 times the diameter of the steel wire. 5. The steel strands without shaft winding shall be laid out from the inner ring under the vertical condition, and the steel strands after the extraction shall be spring-shaped and actively straightened. Tap direction: The direction of the spiral of the spring shape after tapping is the same as the twist of the strand, otherwise it will be twisted or chaotic.

6. The twist of the steel strand is usually left-handed. When using the right twist, it should be indicated in the contract, otherwise it will directly affect the cooperation with the anchor.

7. The quality of the prestressed steel wire hoe is not directly related to the quality of the steel wire itself, but the excessive strength will not be good for the quality of the steel wire hoe. Therefore, when you use the hoe to anchor, it should be stated in the order.

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