CONSTRUCTION METHODS OF CENTRIFUGAL PILES
Many people still wonder how centrifugal pile construction measures are carried out in construction works as well as what to note when constructing them. In the article below, we will share centrifugal pile construction measures as well as some notes on this measure, follow Hung Nghiep Phu to follow the article below!
1. What are the advantages of centrifugal pile construction?
Before learning about centrifugal pile construction methods, you need to understand the outstanding advantages of this construction method. It can be said that centrifugal piles are extremely popular materials in the construction industry today with undeniable advantages.
Các loại cọc được thi công theo biện pháp ly tâm rất chất lượng, đảm bảo tiêu chuẩn quốc tế
With the centrifugal pile construction method, the pile is prestressed combined with centrifugal rotation to help the concrete become dense, strong, crack-free, withstand high loads, and at the same time increase the ability to resist water and corrosion effectively.
The types of piles constructed by the centrifugal method are of very high quality, ensuring international standards by using high-strength concrete and steel, large bending moment, with the ability to resist pile cracking, convenient for transportation, relocation, construction, installation, ...
2. Centrifugal pile construction methods
2.1 Before construction
Before construction, the construction unit needs to carefully check the machine as well as ensure the features and equipment of the press. When testing the equipment, it is necessary to increase the design axial load of the pile by 10 ~ 15% to facilitate checking the overall stability of the system. The capacity of the equipment must be 1.25 times greater than the specified maximum design pressure.
In addition, the construction unit also needs to check the appearance quality and whether the pile symbol is clearly marked. Pay attention to observe the depth of the pile and record the pressure at that depth.
Next, the construction unit will conduct a pile test to determine the initial load force of the pile axial load. The requirements for pile test are as follows:
- When constructing foundation works with complex geology, the number of piles to be tested must not be less than 2% but not exceed 5 piles.
- The pile testing specifications, length and geology must be representative. The test piles should be selected near the locations of the holes that have been technically surveyed.
- The method of testing and the conditions of testing must be consistent with the piles.
Trước khi thi công cọc ly tâm, đơn vị thi công cần kiểm tra máy cẩn thận cũng như đảm bảo các tính năng và thiết bị của máy ép.
2.2 Centrifugal pile driving construction
Based on the density of piles, foundation and overall construction site:
- If the pile density is thick and far from the surrounding architectural block, pile driving from the inside out.
- If the pile density is thick, the site is narrow and long, when the two ends are far from the architectural block, pile driving must be done from the middle first and then to the two sides. When the architectural block is adjacent to one side, construction must be carried out from the side adjacent to the architectural block outward.
Based on the geological conditions at the construction site:
- If the construction site has a large area with a part where the soil layer on the surface has sand; there is a rock, then the construction will be carried out in that area first.
- If the bearing soil layer has a large difference in depth or the depth of the pile when driving; then the long pile will be driven first and then the short pile will be driven.
- Based on the pile specifications and distribution:
- When the pile specifications are uneven, the large pile must be driven first and then the small pile.
- If there is a large pile cap in the construction site (30 piles or more); the large pile cap must be constructed first and then the small pile cap must be constructed.
Next, the construction unit will proceed to weld the piles. When connecting, the construction unit will ensure that the remaining pile length from the ground is 0.5 ~ 1.0 m; and the lower section must be straight or the difference in straightness does not exceed 1%; load the piles about (10 ~ 15%) of the design load during the welding period; to create complete contact between the two flange surfaces.
When welding, in case of using CO2 protective gas; the construction unit must use 2 welding machines to weld symmetrically; at the same time. The welding layer must not be less than 2 layers, must be welded continuously until the weld is full.
In case of using manual welding machine, the welding groove must be first; must be marked from 4 to 6 points symmetrically; wait for the top and bottom of the fixed pile to be fixed before proceeding with the welding layer separation.. After welding, it must be allowed to cool naturally for at least 3 minutes.
3. Notes when carrying out centrifugal pile construction measures
To ensure the quality of centrifugal piles, the construction unit needs to pay attention to the following:
- The jacking system and support bracket must be positioned correctly and vertically.
- The first pile segment is accurately positioned in terms of verticality and position.
- The pile driving equipment is connected to the anchor system or counterweight beam system.
- Steel pilot piles are used in the pile driving process. The two ends of the pile are flat and perpendicular to the pile axis.
- The pile joint is made by welding, ensuring the thickness and technology according to the standards.
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Source: Compiled from the Internet
