Analysis on the shear danger in escalators and mov

2022-08-11
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Analysis of the "shear" danger in escalators and moving sidewalks

Abstract: This paper discusses and analyzes the "shear" danger in adjacent and staggered escalators and moving walkways, and puts forward some preventive measures to prevent the "shear"

danger

for escalators and moving sidewalks that are staggered adjacent to each other, it is necessary to prevent "shear" hazards. On June 17, 2009, the inspectors inspected four escalators in a supermarket in Fuqing. During the preparation for the inspection, they witnessed the following events. Among the four staggered escalators in the supermarket, on one escalator running upward on the fourth floor of three entrances, a customer turned to greet another passenger on the escalator running upward on the third floor of two entrances, ignoring the warning slogan "be careful to meet your head". As the escalator ran upward, The danger of "shearing" is about to happen. Fortunately, the inspectors warned that the accident was avoided. Therefore, when taking escalators and moving sidewalks, do not paralyze the "shear" hazard

1. National standard provisions on "shear" injury protection

in order to prevent the occurrence of "shear" injury, GB l6899-1997 "safety code for the manufacture and installation of escalators and moving walks" and the inspection procedures of escalators and moving walks stipulate that for escalators set in parallel or overlapping with each other, the product features: the distance between the outer edges of the belt is at least 120mm; Set up safety tips to remind escalator and moving sidewalk passengers of the slogan "be careful to meet your head". The slogan is set at the place where the center of the handrail is less than 500mm away from the truss of another escalator or moving sidewalk

2. Discussion on spacing

gb 16899-1997 stipulates that for escalators set in parallel or overlapping adjacent to each other, the outer edge spacing of handrails shall be at least 120mm. But is the 120mm distance too small? Conventional tests: elongation at break, shrinkage recovery? The distance measured by the inspectors on site is 130mm. Although it meets the provisions of the national standard, the risk of "shearing" still exists. Gb16899-1997 stipulates that the 120mm data takes into account the danger of "shearing" and the installation of space and other factors, but the author believes that this distance is a little small. To further improve the stability of fiber performance indicators; To form a series of high-performance fiber varieties such as carbon fiber, aramid fiber, polyimide fiber and poly (4-fluoroethylene fiber), for example, a person with a height of 1.7 meters is set as the height of the handrail is 1 meter. Assuming that the person stretches out a little and forms an included angle of 75 degrees with the ground, the distance should be: (1.)· Cos (75 °) =0.181m, considering the handrail width, the distance is at least 150mm. Therefore, the author suggests that the standard of "the outer edge spacing of handrails should be at least 120mm" should be further studied and revised

3. Preventive measures

in order to prevent the harm of "shearing" in escalators and moving sidewalks set adjacent to each other, the following measures can be taken:

(1) during the design and installation process, try to use the new generation copolyester material developed by Ping Eastman Chemical Company to be used in the setting of infant hearing echo detection equipment, so as to avoid the setting of overlapping pavements

(2) reasonably design the distance between the outer edges of the handrail and the belt. If the installation space allows, the distance should be as large as possible.

(3) for the installed escalator and moving sidewalk, and the outer edge distance of the handrail is too small, protective isolation can be adopted, and the safety prompt of "be careful to meet your head" should be set at the eye-catching position

(4) the best way to prevent danger is to take the elevator correctly and regularly. It is best to have a specially assigned person guide at the entrance of escalators and moving sidewalks with large passenger flow in shopping malls

(5) when taking the escalator, passengers should face the running direction of the escalator, hold the handrails on both sides of the escalator, and stand within the yellow line around the pedal to prevent the trouser legs from rolling into the gap of movement; Don't stretch your hands and head out of the escalator to prevent being hurt by the obstacles nearby during the operation of the escalator

4. Inspectors' attention

escalators and moving sidewalks are relatively prone to "scratch", "crush", "bump", "fall" and "fall" accidents, while the "shear" hazards in adjacent and staggered escalators and moving sidewalks are easy to ignore, so for adjacent and staggered escalators and moving sidewalks, The inspector should focus on the inspection of the outer edge spacing of the handrail and whether the safety warning signs such as "be careful to meet" are set clearly and reasonably. If the distance between the outer edges of the handrail is too small, the user unit should take measures to prevent danger

5. Summary

it is easy to ignore the harm of "shearing" in escalators and moving sidewalks that are staggered adjacent to each other. If the outer edge spacing of handrails is too small, coupled with passengers' uncivilized use of elevators, there will be a danger of "shearing". Therefore, when installing staggered escalators or moving sidewalks, when the space size allows, the outer edge spacing of handrails should be as large as possible, and it is best to set them in parallel. For the escalators and moving sidewalks in use, which are staggered adjacent to each other, if the distance and gap between the outer edges of the holding belt are too small, measures need to be taken, such as using isolation protection, prompting "be careful to meet" at many eye-catching positions, and special personnel guidance, so as to avoid the occurrence of "shear" hazards

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