China Flat Anchorage

LQM Post-tensioned concrete slabs in buildings have many advantages

1. LQM bonded flat slab anchors use No. 15.24mm seven-wire prestressing strands or No. 12.7mm seven-wire prestressing strand and the maximum characteristic tensile strength of 2000 MPa. 

2. Longer Spans

Longer spans can be used reducing the number of columns. This results in larger,

column free floor areas which greatly increase the flexibility of use for the structure and

can result in higher rental returns.

3. Overall Structural Cost

The total cost of materials, labour and formwork required to construct a floor is reduced

for spans greater than 7 metres, thereby providing superior economy.

4. Reduced Floor to Floor Height

For the same imposed load, thinner slabs can be used. The reduced section depths

allow minimum building height with resultant savings in facade costs. Alternatively, for

taller buildings it can allow more floors to be constructed within the original building

envelope.

5. Deflection Free Slabs

Undesirable deflections under service loads can be virtually eliminated.

6. Waterproof Slabs

Post-tensioned slabs can be designed to be crack free and therefore waterproof slabs

are possible. Achievement of this objective depends upon careful design, detailing and

construction. The choice of concrete mix and curing methods along with quality

workmanship also play a key role.

7. Early Formwork Stripping

The earlier stripping of formwork and reduced backpropping requirements enable faster

construction cycles and quick re-use of formwork. This increase in speed of

construction is explained further in the next section on economics.

8. Materials Handling

The reduced material quantities in concrete and reinforcement greatly benefit on-site

cranage requirements. The strength of post-tensioning strand is approximately 4 times

that of conventional reinforcement . Therefore the total weight of reinforcing material is

greatly reduced.

9. Column and Footing Design

The reduced floor dead loads may be utilised in more economical design of the

reinforced concrete columns and footings. In multi-storey buildings, reduced column

sizes may increase the floor net lettable area.