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The correct selection of the ladder(Hits:) 
Origin Author Add Time2016-05-10
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When you need to work at height, how to choose a ladder or scaffold it? The principle is simple work long hours or have to move horizontally, it is best to use scaffolding. If you need to use a ladder, you must select the appropriate ladders are basically divided into two categories, one is straight ladder (straight ladder), one word ladder (stepladder). Ladders can not stand alone, must be against the fixture, the US Occupational Safety and Health Department predetermined length straight ladder to the top to be higher than the desire to reach level (Special Precautions 3-foot ladder: feet) above 91 centimeters, commonly referred to as super extension, hyperextension main purpose is to make the center of gravity close to the vertical ladder to the fixtures, ladders and down when people are less likely to tip over. But if the ladders can not meet the requirements of hyperextension, then the top of the ladder shall be fixed and ladders should be equipped with grasping means or handrail help to provide staff with up and down a ladder at any time to maintain three points of contact (ie, feet and hand) .
There are ladders of metal, wood and glass fiber and other materials, exactly what materials you want to use a ladder to do it? While many people are aware of metal ladders can not be used in places where the risk of electric shock, but there are still many people in the United States due to the bare metal ladder down fall lines electrocution deaths a year, but with particular attention to even the wooden ladder and glass fiber shock ladder same problem may occur in the wet. Fiberglass ladder, although there are advantages of strength and light weight, but the glass fiber material is very easy to deteriorate due to exposure to sunlight, and some chemicals can easily damage the glass fibers. Therefore, when using a glass fiber ladder to special inspections such as discoloration or cracks and other damage characteristics. Ladders ladder there are heavier than aluminum and easy to aging damage shortcomings.
Select the ladder should be noted that the maximum load limit, when overweight people or carry heavy goods up and down the ladder special attention. Ladder truck into the United States by light work (light duty), work (medium duty), heavy work (heavy duty) and overweight work (extra heavy duty) four grades, the maximum load was 91 kg (200 lbs), 102 kg (225 lbs), 114 kg (250 lbs) and 136 kg (300 lbs). (Currently there is no specification)
Check the ladder before use
Ladder safe biggest problem is that most people use without making prior examination. Although sometimes it will break the ladder, aluminum ladder will bend, fiberglass ladder will be split in appearance is not always clear, but pay more attention to maintenance and inspection in advance, most accidents can be avoided. Second is to check the foot of the ladder, and most of the metal ladder and fiberglass ladder has ladder booties (shoe), in order to increase friction and prevent slipping accidents, should be checked before using the ladder wear gloves if exhausted. Metal ladder will have to check whether the bolts loose or damaged welding place before climbing ladders to check the front-end hook.
Proper use of ladders
Although there is a ladder foot of the ladder to grab the floor, but if the person standing on a ladder at the top of the body roll extract, the move will form the focus of the entire ladder, when the lateral force and torque exceeds the friction resistance and torque can cause the ladder slip or tip over. In addition, the use of the basic principles of the ladder is to be placed on a solid and stable ground, usually outdoors because the ground is not flat, soft, easy to run into problems, while the interior grunge, slippery ground is also very dangerous. Therefore, leveling the ground, removing debris or drying wet, it is very important.
Often see the phenomenon of incorrect use of ladders, one person standing on a ladder use mobile ladders swing mode, for example, when the painter painted the ceiling, it is easy to cause rollover accidents; the second is to close together when the word ladder straight ladder to use when co-ladder used as a straight ladder, foot of the ladder can not provide enough friction, so it is likely to cause slip accident.
Ladder to keep itself clean, dirt, grease, and other slippery substances should always clean up. Nearby ladder job to maintain the "headroom" recommend placing warning signs, and other obstructions to prevent people or vehicles careless collision ladders, dangerous. In addition, as the ladder is placed in front of the door lock or tie the best, or the person who set alert. Be sure to keep three points of contact principles and down the ladder, such as climbing to carry tools, be sure to use the tool bag or tool belt, try not to use hand. Up and down a ladder to rank order from top to bottom, down the ladder should face the ladder is stepped down, do not back the ladder. If you think someone needs help escalator midnight, you should find someone to help. Finally, illness or medication could affect the balance of the case, do not use a ladder conceited
to sum up
        1, before use, check the ladder. Make sure the ladder rungs and ladder gloves solid and reliable, the above does not prevent you from standing accumulation of dirt and paint.
        2, leveling the ground, clear the ground of debris or drying wet
        3, when the ladder is placed in front of the door should be locked or tied, or the person who set alert
        4, when using ladders or extension ladders, make sure that the height of each increased by 1 meter distance from the wall increases 0.3 m
        5, follow the "four-point contact" principle: When using ladders, make sure the top of the ladder two bars are firmly rely on the wall, and two ladder legs must be firmly supported on the floor or ground .
        6, when using the word ladder, make sure the ladder support bar has been fully extended and locked securely. Prohibited word used as a straight ladder ladder collapsed.
        7, up and down the ladder must maintain three points of contact principle (ie, feet and hand)
        8, when using ladders, standing height should not exceed a third of the top-down ladder crossbar. Be sure to pay attention to the top of the ladder at least one meter higher than the highest point you need to stand.
        9, before climbing any ladder should confirm your pocket without any knives, scissors or other pointed tool.
        10, when working on a ladder, it should keep the center of gravity of the body between the two armrests for balance.
        11, after the balance on a ladder, do not use excessive force to push scraper or other tools.
        12, when working on a ladder, always wear rubber sole or other types of non-slip shoes.
        13, when working on a ladder, in particular should pay attention to construction methods and posture, avoid the head up looking at the job to prevent falling back.
        Outdoor use
        14, avoid working in wet or windy weather, damp and do not climb ladders.
        15, all ladders must be away from power lines - especially metal ladder.
        16, the ladder must be placed on solid ground - plywood laid at the foot of the ladder, to ensure a safe footing.
In addition, a substantial portion of the ladder system and the room can be together or have on board and the wall or a hole bolted together, to obtain More good security.
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