On first thought, building a 2-mile section of elevated, twin bridge interstate highway doesn't seem like an especially challenging project
Crane accidents are preventable. Most are caused by inexperience, neglecting to preplan a lift, failure to inspect the crane and rigging before a lift, not setting up the crane properly, improperly rigging the load, and other similar problems. Knowing the basics of safe crane operation not only helps complete jobs safely, it also improves jobsite efficiency.
The first shotcrete homes were built shortly after the shotcrete process was invented in 1910. In the 1960's a new shotcrete construction panel system was developed. Referred to as welded wire sandwich panels (WWSP), the system has a core of polyurethane or polystyrene insulation sandwiched between two layers of welded wire fabric. The panels, which usually measure about 4x8 feet, are erected and joined on the jobsite, and covered with a minimum of 1.5 inches of shotcrete on both sides.
Dependability is one of the hallmarks of modern boom trucks. They work hard and run long. Breakdowns are rare. In addition, they place concrete quickly and efficiently. Some pumps are capable of delivering more than 200 cubic yards of concrete per hour. Versatility is another attribute of today's boom trucks. Some models with five-part booms can reach up or out more than 200 feet.
Before beginning a demolition project, OSHA mandates that an engineering survey of the structure be undertaken by a competent person. The survey determines the condition of the framing, floors, and walls, and also the possibility of the unplanned collapse of any portion of the structure. Safe floor loads should be determined to prevent overloading with demolition debris.
