Construction projects involving excavation and trenching are some of the most hazardous workplace activities. An excavation is described as any man-made cut, cavity, trench, or depression that is formed by earth removal. The word “trench” is specific to underground excavations which are deeper than it is wide, being no wider than 15 feet. The fatality rate for all sorts of excavation work is 112% higher than that of general industry (U.S. Occupational Safety and Health Administration). Given this higher level of danger, it’s critical that safety precautions and controls be applied constantly and that extreme care and patience be exercised when working in and around pits and excavations.
The two basic ways of protecting workers against cave-ins are sloping and temporary protective structures. Sloping involves cutting back the trench wall in an angle which is inclined away from the work part of the excavation. The correct angle of the slope depends on the soil conditions in the site of excavation. Temporary protective structures are designed to provide defense against cave-ins, collapse, sliding or rolling materials. Samples of temporary protective structures include shoring, trench boxes, pre-fabricated systems, hydraulic systems, and engineering systems.
Shoring is a system that supports the sides or walls and normally requires the usage of aluminum, steel, or wood panels which are supported by screws or hydraulic jacks. Shoring should be done in conjunction with the advancement of the excavation. If you have any delay between digging and shoring, no workers should go into the unprotected trench. Trench Boxes tend to be used in open areas which can be from utilities, roadways, and foundations. Trench boxes can be used to protect workers in cases of cave-ins, but they are not a replacement for shoring. When the trench or excavation walls are made from rock, rock bolts or wire mesh could be used to offer additional support.
trench jacks are strong steel tubular like instruments that consist of a 4 part system; A male section, female section, a winding collar along with a small stout pin. The Hydraulic Shoring Jacks For Sale essentially job is by the female section accepting the male, allowing the two sections to be fully adjustable to a suitable height. The sections have holes inside them in order that the stout pin could be inserted to ensure they are fixed at your chosen height. The props are able to further be adjusted by turning the winding collar.
At each end of the female and male sections will be a steel plate which can be usually about 150 mm x 150 mm. The plate can there be to assist the trench jacks locate a suitable bearing on both the ground and the force to get supported.
There are numerous of ways to use trench jacks but probably the most common methods are by utilizing them in conjunction with either timber needles or strongboys. Needles in construction are short stout timber beams, as well as an acrow prop could be placed towards each end, in which the load being supported is within the middle. Strongboys really are a more modern method where exvcgw 1 prop is required to fix towards the strongboy, which in turn would then be placed constantly in place to support the burden.
If you wish to support a wall and you have chosen to utilize needles, then this method will be to knock a few bricks with the wall large enough to place the needles through, then each and every end an acrow prop will be placed and tightened until it is tight in between the brick and ground level. It is a two man job and can be quite trick to obtain the needles to balance whist setting them correctly in place.
Using strongboys is actually a far easier method because it is usually only a case of hacking out a mortar joint where load is to be supported, then inserting the long, thin arm of the strongboy in. Just like the needles method, the trench jacks are them tightened up securely. Some great benefits of using strongboys with the trench jacks however, is that the load only has to be maintained by putting the props at one side in the wall.
It’s important to understand that collapses can occur unexpectedly, regardless of the depth. Actually, nearly all fatalities occurs at minimal depths when workers fail to appreciate the hazards involved. All excavation projects present serious safety risks, but injuries and fatalities as a result of collapses are preventable with proper planning and safety precautions.