The difference between post-cast strip and waterstop (waterstop strength)

The post-cast strip is temporary, while the waterstop is not.

[Post-cast strip] A post-cast strip is a temporary construction joint reserved at specific locations on the foundation slab, walls, and beams during building construction. It is designed and constructed according to design or construction specifications to prevent harmful cracks that may occur in cast-in-place reinforced concrete structures due to uneven shrinkage or settlement.

A post-cast strip is a concrete strip of a certain width reserved in structures such as beams, slabs (including foundation slabs), and walls, which is poured after a certain period of time to accommodate factors such as changes in ambient temperature, concrete shrinkage, and uneven structural settlement.

[Waterstop] Waterstops utilize the high elasticity and compressive deformation characteristics of rubber to undergo elastic deformation under various loads, thereby effectively tightening and sealing, preventing water leakage and seepage in building structures, and providing shock absorption and cushioning.

The waterstop is primarily installed at the construction joints of different sections to increase the bonding area between two concrete constructions, mainly to meet the waterproofing requirements of the construction joints. It should be folded and interlocked or overlapped according to its thickness; during the concrete pouring process, part or all of it should be embedded in the concrete.

Waterstop is mainly used in infrastructure projects, underground facilities, tunnels, sewage treatment plants, water conservancy, subways, and other projects.

It is used for the concrete pouring and preparation of expansion joints in gates, dam bases, construction projects, underground structures, etc.

QZ series rubber products.

Thus ensuring the service life of the engineering construction.

The waterproofing effect and principle of waterstop steel plates in engineering. (The function and application of steel plate waterstop)

1. The waterproofing role of waterstop steel plates in engineering:

It is primarily used in infrastructure projects, underground facilities, tunnels, sewage treatment plants, water conservancy, subways, and other engineering projects. It is used for the concrete casting of expansion joints in gates, dam bases, construction projects, underground buildings, etc. The QZ series rubber is used to ensure the service life of engineering structures.

II. Principle of waterstop steel plate in engineering:

The steel plate waterstop involves embedding a 300mmx3mm steel plate when pouring the lower layer of concrete, with 10-15cm of the upper part exposed. During the next concrete pouring, this part of the steel plate is poured in together, serving to prevent the infiltration of external pressure water.

Generally, steel plate waterstops use cold-rolled steel plates as the base material, as the thickness of cold-rolled plates can be uniform, while the thickness of hot-rolled plates generally cannot achieve uniformity, typically being 2mm or 3mm. The length is generally processed to be 3 meters or 6 meters, with 3 meters being more convenient for transportation. Waterstop steel plates have high requirements for welding joints, as any missing points can affect the waterproof performance.

Additional information:

Key points for the construction of waterstop steel plates:

1. Every effort should be made to ensure that the waterstop steel plate is positioned on the centerline of the wall;

2. The welding between two steel plates should be full and double-sided, with a steel plate overlap of not less than 20mm;

3. For the treatment of wall corners, there are three options: 1. bending a whole steel plate; 2. T-shaped welding; 3. 7-shaped welding.

4. For the support welding of the waterstop steel plate, small steel bars can be spot welded onto the main steel bars;

When the waterstop steel plate passes through the column stirrups, the stirrups it passes through can be disconnected and made into open stirrups, which are then electric welded onto the steel plate;

6. The "opening" of the waterstop steel plate faces the upstream face.