PRC Pile - Pile business(Products)Inquiry
They are piles with PC steel bars and deformed bars placed in high-strength concrete.
- Products handled
-
DAM105 pile / TS-DAM105 pile / BF-DAM105 pile / BF-TS-DAM105 pile
Other DAM pile / BF-DAM pile / TS-DAM pile / COPITA form PRC pile / RC pile
Types of PRC Pile
- * Pile length 4 ~ 15 m
- * In cases of piles 6 meters or less, please consult with us.
- * Pile diameter: 300 ~ 1,200 mm
PRC105
- Major features
-
These are ultra high-strength PHC piles using specified concrete strength Fc = 105 N / mm2. These products are optimal for the high bearing capacity pile construction method, and a wide range of designs will be possible.
For the thickness of the pile, we have a lineup consisting of a standard type, a thick type, and a special thick type.
Numbers used for design
1.Material strength
- 1-1 Concrete
-
Compressive strength 105.0 N / mm2 Tensile strength 5.5 N / mm2 Bending tensile strength 6.5 N / mm2 Young’s modulus 40,000 N / mm2
- 1-2 PC Steel Rod
-
Standards SBPDL1275/1420 Young’s modulus 200,000 N / mm2
- 1-3 Deformed bar
-
Standards SD345 Young’s modulus 200,000 N / mm2
- 1-4 Shear reinforcement
-
Yield stress 50K:490 N / mm2 Yield stress 80K:785 N / mm2
Features
- ● Uses ultra high strength concrete (Fc = 105 N / mm2) and supports high bearing capacity
- ● Allowable compressive stress is greatly improved and beneficial for cost reduction at design time
- ● Improvement of shear strength using shear reinforcement
2.Allowable unit stress
2-1 Concrete
| Allowable unit stress for sustained loading(N / mm2) | ||
|---|---|---|
| Compressive | Bending | Diagonal |
| 30.0 | 2.0 | 1.2 |
| Allowable unit stress for temporary loading(N / mm2) | ||
|---|---|---|
| Compressive | Bending | Diagonal |
| 60.0 | - | - |
2-2 Deformed bar
| Allowable unit stress for temporary loading(N / mm2) | |
|---|---|
| Compressive | Tensile |
| 345 | 345 |
| Allowable compressive stress for sustained loading(N / mm2) | |
|---|---|
| DAM・BF-DAM | DAM105・TS-DAM105 BF-DAM105 ・BF-TS-DAM105 |
| 24.0 | 30.0 |
| Allowable compressive stress for temporary loading(N / mm2) | |
|---|---|
| DAM・BF-DAM | DAM105・TS-DAM105 BF-DAM105 ・BF-TS-DAM105 |
| 48.0 | 60.0 |
Comparison of flexural strength
The flexural strength of DAM105 standard type and DAM will be as shown on the right figure. (For representation, values for 1000mm A-type D13 form diameters are shown.)
The DAM105 and the DAM have the same reinforcement strength for steel rods, so the yield strength at full tension is the same, but as the axial force increases, the ratio of the burden of concrete increases, so the greater the axial force applied to the pile, the greater the benefits demonstrated by the DAM105 will be.
CPRC
- Major features
-
CPRC piles are high strength prestressed reinforced concrete (PRC) piles that conform to COPITA specifications, and they are earthquake-resistant piles that incorporate a new shear strength formula.
For spiral rebars as shear strengthening muscle of CPRC pile, it is assumed that high strength reinforcing bars (products certified by the minister conforming to Article 37, item 2 of the Building Standard Law) can be used, and it is possible to design in a way that does not lead to shear fractures by considering structural details.
Features
- 1. Great flexural strength
- Because the reference strength of concrete is 105 N / mm2 and the PC steel material and the special-shaped steel bars are positioned, they have high axial forces and high flexural strengths.
- 2. Excellent durability
- Because of the introduction of prestressing, even if temporary bending cracks occur due to seismic force, cracks close in long-term loading, so they excel in durability.
- 3. Great deformation performance and shear capacity
- Since the spiral rebar that satisfies (ρS ・ σy ≧ 2.45) stipulated in "Road Bridge Specification Form IV" is arranged, it has a large deforming performance and shear strength, and it is a structure that prevents shearing failure easily.
- 4. Connection between CPRCs is possible
- It is possible to connect CPRC piles by using R type fittings.
Size Overview
Size
| Outer diameter | φ300?1000mm |
|---|---|
| PC steel material diameter | 10.0mm、11.2mm |
| Deformed bar steel diameter | D13?D29 (SD345 material) |
| Pile length | 4?15m |
Allowable unit stress values
| Standard strength of spiral rebar | 345?785 N / mm2 |
|---|---|
| Concrete design standard strength | 105 N / mm2 |
| Allowable compressive stress level of concrete | Sustained = 30 N / mm2, Temporary = 60 N / mm2 |
| Allowable tensile strength level of deformed steel bar | Sustained = 215 N / mm2 (D29 is 195) Temporary = 345 N / mm2 |
| Allowable unit values for flexural crack width | Sustained ≦ 0.1mm, Temporary ≦ 0.3mm |
