In the process of making, lifting, transporting and stacking reinforced concrete precast piles: engineering geological data, pile foundation construction plans, pile foundation construction organization design or plan should be required during production. The piles should reach 75% of the design strength before they can be lifted, and 100% before they can be transported and pressed.
The site should be flat and solid, and no uneven settlement should occur. The positions of the skids and lifting points should be the same and should be kept in the same plane. Piles of the same model and specification should be stacked together, and the pile tips should be toward one end to facilitate pressure application. Multiple layers of skids should be aligned up and down, and the lowest layer of skids should be appropriately padded. The number of stacked layers should generally not exceed four.
When stacking prestressed pipe piles, pads may or may not be provided between layers. When there are no pads between layers, the bottom layer of pads attached to the ground shall not be omitted. The pipe piles at the edge of the skid should be tightly plugged with wooden wedges to prevent rolling. Reinforced concrete (English: Reinforced Concrete or Ferroconcrete) is often referred to as reinforced concrete (tong) in engineering.
It refers to a composite material that works together to improve the mechanical properties of concrete by adding steel mesh, steel plates or fibers to concrete. The most common form of reinforced concrete. Currently in China, reinforced concrete is the most widely used structural form, accounting for the vast majority of the total. At the same time, China is also the region that uses the most reinforced concrete structures in the world.
The output of cement, its main raw material, reached 1.882 billion tons in 2010, accounting for about 70% of the world's total output. The invention of reinforced concrete appeared in modern times. It is generally credited to French gardener Joseph Monnier, who invented reinforced concrete in 1849 and patented it in 1867, including reinforced concrete flowerpots and subsequently reinforced concrete beams and columns used in highway guardrails. .
Working principle:
The reason why reinforced concrete can work independently is determined by its own material properties. First of all, steel bars and concrete have approximately the same linear expansion coefficient, so there will be no excessive stress caused by different environments. Secondly, there is good bonding between steel bars and concrete. Sometimes the surface of steel bars is also processed into spaced ribs (called deformed steel bars) to improve the mechanical engagement between concrete and steel bars.
When this is still not enough to transmit the tensile force between the steel bar and the concrete, the end of the steel bar is usually bent into a 90-degree hook. In addition, the alkaline environment provided by the calcium hydroxide in the concrete forms a passivation protective film on the surface of the steel bars, making the steel bars less susceptible to corrosion than in neutral and acidic environments.