What is the difference between prefab and precast?

Now, let me introduce my good friend, Precast. Precast is really dedicated as it only focuses on concrete. It plays a crucial role in many common construction projects. Take a typical multi - storey apartment building for example. In the construction of this apartment building, Precast is everywhere. The load - bearing columns and large floor slabs are made by Precast. First, in the precast factory, they create precise molds according to the design requirements. These molds are made to ensure the accuracy of the shape and size of the components. Then, steel bars are carefully placed inside the molds. These steel bars are like the skeleton of the concrete elements, providing additional strength. After that, high - quality concrete is poured into the molds. To make sure the concrete is compact and free of air bubbles, workers use special vibrating equipment to gently shake the molds. This process makes the concrete elements extremely strong. Once the concrete has cured and hardened, the precast columns and slabs are carefully removed from the molds. They are then transported to the construction site. At the site, large cranes are used to precisely lift and place these precast elements. The columns are erected first, and then the floor slabs are carefully placed on top of the columns, creating a stable and sturdy structure floor by floor. This not only speeds up the construction process but also ensures the quality of the building.

Another common project where Precast shines is in the construction of a shopping mall's parking garage. The precast concrete beams and panels used in the parking garage are manufactured with great precision. The beams are designed to bear the weight of the vehicles parked on the upper levels. In the factory, different types of molds are used to create beams of various lengths and thicknesses according to the design of the parking garage. The concrete panels, which form the floors and walls of the parking garage, are also made with attention to detail. They are often designed with special textures to improve skid resistance and durability. After being transported to the construction site, these precast elements are assembled in an orderly manner. The beams are installed first to form the framework, and then the panels are attached to complete the structure. This efficient use of Precast in the parking garage construction helps to build a large - scale and functional parking facility in a relatively short time.

When it comes to my manufacturing process, it varies a lot. If I'm using wood, I need to cut, shape, and assemble the wooden parts. If it's steel, I have to weld, paint, and install small parts in advance. I can even integrate electrical and plumbing systems.

Precast has its own set procedures during manufacturing. It starts with making molds, putting in steel bars or wire meshes, pouring concrete, and vibrating to remove air bubbles. After the concrete dries, it's taken out of the mold and readied for the construction site.

Precast, although it can also come up with many design ideas, is more restricted compared to me. It has to comply with the limitations of molds and the structural requirements of concrete. However, with advanced mold technology, it can still create a wide range of shapes and textures. But for really complex designs, it may require more effort and cost.

So, even though Precast and I are both in the construction field, we each have our own characteristics and uses!