Amendments to guidance on applying pile construction norms in Vietnam from October 15, 2024

Amendments to guidance on applying pile construction norms in Vietnam from October 15, 2024

The Circular 09/2024/TT-BXD has amended sections 1 and 10 of the guidelines for applying pile construction norms in Chapter III of Circular 12/2021/TT-BXD, with the following specific instructions after the amendment:

(1) The norm for driving and pressing piles is calculated for 100m of piles submerged in the ground. The labor and construction machinery costs for the portion of the piles not submerged in the ground shall apply a coefficient of 0.75 compared to the corresponding pile driving and pressing norms. Pile material costs are calculated based on the design.

(2) The norm for extracting piles is calculated for 100m of piles submerged in the ground.

(3) When driving, pressing inclined piles, the labor and construction machinery norms shall apply a coefficient of 1.22 compared to the corresponding pile driving norms.

(4) In cases where guide piles must be used to drive, press submerged piles, the labor and construction machinery norms for driving, pressing guide piles shall apply a coefficient of 1.05 compared to the corresponding pile driving, pressing norms. The norm for driving and pressing guide piles is calculated for the length of guide piles submerged in the ground and does not include the processing work for the guide piles.

(5) The norm for driving piles using underwater pile driving machines does not account for the work of creating work platforms, clamp release, and floating pontoons.

(6) The norms for other material costs include the costs for pile cap padding and pile head covers.

(7) To determine the soil class for applying the norms as follows:

- If the total depth of soil class I layers is ≥ 60% of the submerged pile length, apply soil class I norms.- If the total depth of soil class I layers is < 40% of the designed submerged pile length, apply soil class II norms.

(8) When pile driving, pressing must use a pilot drilling method, the segment of pile driving, pressing through the pilot drilling depth shall apply soil class I driving, pressing norms (Pilot drilling work is not included in the norms).

(9) The work of driving, pressing pipe piles of various types does not account for material wastage due to mixing slurry and soil inside the piles.

(10) The norms for driving, pressing steel sheet piles (Larssen piles), steel pipe piles, and steel section piles are calculated for 100m of piles submerged in the ground. When the piles are extracted and reused multiple times, the material waste is determined as follows:

- Waste calculated based on time and environment:

+ Material waste for piles used in construction sites ≤ 1 month as follows:

++ If piles are driven or pressed on land or in freshwater, 1.17%,

++ If piles are driven or pressed in brackish water, 1.22%,

++ If piles are driven or pressed in saltwater, 1.29%.

+ For each additional month the piles remain in the construction site from the second month onward, the material waste is calculated as follows:

++ If piles are driven, pressed on land or in freshwater, 1.17% per month,

++ If piles are driven, pressed in brackish water, 1.22% per month,

+ If piles are driven, pressed in saltwater, 1.29% per month.

- Waste due to breakage, chipping of pile heads and caps:

+ Driving, extracting into soil class I, II, waste is 3.5% per extraction cycle.

+ Driving, extracting into soil with a stress ≥ 5 kg/cm², waste is 4.5% per extraction cycle.

+ For pressing and extracting piles into soil, rocks, the waste due to breakage, chipping of pile heads and tips, is calculated as 50% of the waste due to breakage, chipping of pile heads and tips when driving and extracting piles.

- If piles are manufactured at the construction site as required, the above-mentioned wastage calculations apply only to the materials used for pile manufacturing (sheet steel, section steel).

(11) In cases where piles cannot be extracted and must be cut, the portion of the piles left in the construction site is calculated at 100% of the volume of piles remaining in the site.

More details can be found in Circular 09/2024/TT-BXD, which comes into force in Vietnam from eOctober 15, 2024.

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