Specification and function of post-pouring belt setting

Specification and function of post-pouring belt setting

The specification requirements of post-cast strip are as follows:

1, the width of post-cast strip is generally 700- 1000mm, but there are three common types now: 800mm, 1000mm and1200 mm.

2. There are four joint forms of post-poured strip: straight joint, step joint, notch joint and X-joint.

3. The steel bars in the post-cast strip are completely disconnected and then overlapped, and there are provisions for continuously setting additional steel bars.

4. The concrete pouring time of post-cast strip is not less than 14 days in some regulations, not less than 42 days in some regulations, not less than 60 days in some regulations, and 28 days after capping in some regulations.

5, the concrete preparation and strength of post-cast strip, some require the original concrete to improve the strength grade, and some require the use of the same grade or improve the grade of non-shrinkage concrete pouring.

6. Inconsistent maintenance time, including 7 days, 14 days or 28 days.

Setting function of post-cast strip

Post-pouring belt is an effective measure to solve settlement difference and reduce shrinkage stress, so it is widely used in engineering. The position and distance of post-cast strip are determined by design and calculation, and its width is usually 800 ~1200mm in consideration of simple construction and avoiding stress concentration. Post-pouring belt should be set in the parts with waterproof requirements, and the structure of water stop should be considered; When setting up post-cast strip, the consumption factors of different measures such as formwork should also be considered; The strength grade of the concrete filled in the post-pouring belt should be one grade higher than that of the original structure.