Widest Hot rolled Sheet pile × Reusability
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Widest Hot rolled Sheet pile × Reusability
The world’s largest single hot-rolled steel sheet pile (900mm), the Hat-type sheet pile, can be applied to temporary construction projects to shorten the construction period and reduce the weight of steel materials compared to general-purpose U-type sheet piles, thereby optimizing the overall project.
Reusability
Advantages of Widest Hot rolled Sheet pile x Reusability
- Superb drivabilityThe large sectional area of the Hat-type sheet pile realizes superior drivability.
- Excellent cost-effectivenessThe amount of steel per unit wall can be reduced, resulting in improved total cost.
- ReusabilityRealize same reusability as much as conventional steel sheet pile.
- High structural reliabilityNo need to consider the reduction factor, and this permits economical design.
Reusability of Hat-type sheet pile
Hat-type sheet piles are as reusable as U-type sheet piles. Reusability test have been conducted in Singapore. The installing time of Hat-type and U-type sheet piles in the same ground was measured. It was confirmed that the steel sheet piles were not significantly deformed and could be driven at a constant driving speed (equivalent to that of U-type) within the range of repetitions conducted in the test.
Benefit of Hat-type sheet pile
Benefit 1 : Steel weight saving
Hat-type sheet piles are lighter in weight per unit width and can reduce steel weight by up to around 30% compared to U-type.
※This is just an example and results may very depend on design condition and other factors.
Benefit 2 : Rapid construction
Hat-type steel sheet pile reduce the number of steel sheet piles required and shorten construction time.
Benefit 3 : Heigh watertightness
Hat-type steel sheet pile reduce the number of joints and improve the watertightness.
Case Study
Advantage of Hat-type sheet pile in constructing 200m width retaining wall is as you can see as below.
Comparison per Unit
| Hat-type (NS-SP-25H) | U-type (NS-SP-IV) | |
|---|---|---|
| Driving time | 15 min/pile | 15 min/pile |
| Steel weight | 126 kg/m2 (▲34%) | 190 kg/m2 |
※Driving time is 12m length pile based on our experiment in Singapore
Comparison per 200m width retaining wall
※The above calculation is just an example and the results may vary depending on design condition and other factors.
Interlock integrity
When a wall using U-type steel sheet piles is subjected to bending due to soil pressure or other horizontal load, a large bending shear force occurs in the interlocks of the sheet piles because these interlocks are located at the center of the wall （neutral axis position）. In this case, if the shear force doesn’t transmit sufficiently between the adjacent the interlocks slip from each other, and the moment of inertia and section modulus of the wall of the sheet piles are reduced. This can be referred to as “lack of interlock integrity”. And the degree of reduction of sectional properties is expressed by reduction factor. In contrast, for a wall using Hat-type sheet piles, the reduction of sectional properties is not required because interlocks are located at the most edge of the wall, which means that the shear force does not occur in the interlocks.
Shapes
Sectional properties
| Type | Dimension | Per pile | Per 1 m of pile wall width | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Effective width W mm |
Effective height h mm |
Thickness t mm |
Sectional area cm2 |
Moment of inertia cm4 |
Section modulus cm3 |
Unit mass kg/m |
Sectional area cm2/m |
Moment of inertia cm4/m |
Section modulus cm3/m |
Unit mass kg/m2 |
|
| NS-SP-10H | 900 | 230 | 10.8 | 110.0 | 9,430 | 812 | 86.4 | 122.2 | 10,500 | 902 | 96.0 |
| NS-SP-25H | 900 | 300 | 13.2 | 144.4 | 22,000 | 1,450 | 113 | 160.4 | 24,400 | 1,610 | 126 |
| NS-SP-45H | 900 | 368 | 15.0 | 187.0 | 40,500 | 2,200 | 147 | 207.8 | 45,000 | 2,450 | 163 |
| NS-SP-50H | 900 | 370 | 17.0 | 212.7 | 46,000 | 2,490 | 167 | 236.3 | 51,100 | 2,760 | 186 |