Construction projects involving excavation and trenching are among 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 term “trench” is specific to underground excavations which are deeper than it is wide, being no wider than 15 feet. The fatality rate for all types of excavation effort 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 all the time and that extreme care and patience be exercised when employed in and around pits and excavations.
Both basic ways of protecting workers against cave-ins are sloping and temporary protective structures. Sloping involves cutting back the trench wall with an angle that is inclined from the work section of the excavation. The proper angle of the slope depends on the soil conditions at the site of excavation. Temporary protective structures are made to provide defense against cave-ins, collapse, sliding or rolling materials. Types of temporary protective structures include shoring, trench boxes, pre-fabricated systems, hydraulic systems, and engineering systems.
Shoring is actually a system that supports the sides or walls and normally requires using aluminum, steel, or wood panels which can be backed up by screws or hydraulic jacks. Shoring should be carried out in conjunction with the advancement of the excavation. If there is any delay between digging and shoring, no workers should go into the unprotected trench. Trench Boxes tend to be used in open areas that are from utilities, roadways, and foundations. Trench boxes can be used to protect workers in cases of cave-ins, but are not a alternative to shoring. In the event 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 and a small stout pin. The Hydraulic Shoring Jacks For Sale essentially job is from the female section accepting the male, allowing the 2 sections to get fully adjustable to your suitable height. The sections have holes in them so that the stout pin could be inserted to keep them fixed in your chosen height. The props can then further be adjusted by turning the winding collar.
At every end in the men and women sections is a steel plate which can be usually about 150 mm x 150 mm. The plate will there be to help the trench jacks find a suitable effect on the ground as well as the force to get supported.
There are numerous of methods to utilize trench jacks but essentially the most common methods are by using them along with either timber needles or strongboys. Needles in construction are short stout timber beams, plus an acrow prop would be placed towards each end, where the load being supported is within the middle. Strongboys really are a more modern method where exvcgw 1 prop is necessary to fix to the strongboy, which often would then be placed constantly in place to support the load.
If you need to support a wall and you have chosen to utilize needles, then your method is usually to knock several bricks with the wall large enough to set the needles through, and then at every end an acrow prop will be placed and tightened up until it is actually tight between the brick and ground level. This is a two man job and can be extremely trick to get the needles to balance whist setting them correctly set up.
Using strongboys is really a much easier method as it is usually merely a case of hacking out a mortar joint where the load is to be supported, and then inserting the long, thin arm in the strongboy in. As with the needles method, the trench jacks are them tightened up securely. Some great benefits of using strongboys with all the trench jacks however, would be that the load only needs to be supported by putting the props at one side of the wall.
It’s important to understand that collapses can occur without warning, regardless of the depth. In fact, nearly all fatalities occurs at minimal depths when workers neglect to appreciate the risks 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.