What is a Pre-engineered Building?
Pre-engineered buildings are factory-built buildings of steel that are shipped to site and bolted together.What distinguishes them from other buildings is that the contractor also designs the building--a practice called design &build.This style of construction is ideally suited to industrial buildings and warehouse.It is cheap,very fast to erect,and can also be dismantled and moved to other site.There structures are sometimes called metal boxes or tin sheds by laymen,they are essentially rectangular boxes enclosed in a skin if corrugated metal sheeting.
This structural system of pre-engineered steel building give it its speed and flexibility.The columns and beams are custom-fabricated I-section members that have an end plate with holes for bolting at both ends.These are made by cutting steel plate of the desired thickness,and welding them together to make I sections.The cutting and welding is done by industrial robots for speed and accuracy;Operators will simply feed a CAD drawing of the beams into the machines,and they do the rest.This production line style of work makes for great speed and consistency in fanrication.The shape of the beams can be tailored to optimum structural efficiency:they are deeper where the forces are greater,and shallow where they are not.This is one form of construction in which the structures are designed to carry exactly the loads envisioned,and no more.
Each piece of the structural system is very much alike---an I section with end plates for bolting.The painted steel sections are lifted into place by crane,and then bolted together by construction workers who have climed to the appropriate position.In large buildings,construction can start with two cranes working inwards from both ends;As they come together,one crane is removed and the other finishes the job.Usually,each connection calls for six to twnety bolts to be installed.Bolts are to be tightened to exactly the right amount of torque using a torque wrench.
Post time: Nov-10-2021