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Safety evaluation method for climbing vertical ladder

A technology of safety evaluation and straight ladder, applied in the field of safety evaluation of climbing straight ladders, can solve problems such as inability to effectively prevent safety accidents, and achieve the effect of avoiding safety accidents

Inactive Publication Date: 2021-01-26
XI'AN POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no safety evaluation method specifically for climbing ladders, which makes it impossible to effectively prevent safety accidents caused by climbing ladders during the design and use of climbing ladders

Method used

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  • Safety evaluation method for climbing vertical ladder
  • Safety evaluation method for climbing vertical ladder
  • Safety evaluation method for climbing vertical ladder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0036] Step 1, check the static friction coefficient between the ladder and the two contact surfaces through Table 1:

[0037] f sA =0.40

[0038] f sB =0.62

[0039] Step 2, weigh the weight P of the ladder 1 =200N, take the weight P of the person climbing the ladder 2 =700N;

[0040] Step 3, obtain the length l=5m of the ladder, the angle θ=55° between the ladder and the horizontal plane;

[0041] Step 4, calculate the critical height h of people on the straight ladder c =4.68m

[0042] Step 5, take the safety factor n s = 1.2, the actual climbing height of a person on the climbing ladder is h, and its safety evaluation is carried out:

[0043] h>4.68m danger

[0044] 3.90m≤h≤4.68m warning

[0045] h<3.90m safe

[0046] Through the above evaluation, the safe climbing height of people on the climbing ladder can be obtained, which can effectively prevent safety accidents caused by people climbing too high. In addition, the present invention can also provide a cert...

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Abstract

The invention discloses a safety evaluation method for a climbing vertical ladder. The method specifically comprises the following steps: 1, determining static friction coefficients of two contact surfaces in contact with the upper end and the lower end of the ladder; 2, setting the weight of the ladder to be P1 and the unit to be N; setting the weight P2 and the unit N of a person climbing the elevator; 3, measuring the length l and the unit m of the ladder, and measuring the included angle theta between the ladder and the horizontal plane; 4, calculating the critical height hc of the climbing personnel on the climbing straight ladder; and 5, setting the safety factor ns and the actual climbing height h of the climbing personnel on the climbing straight ladder, and evaluating the safety of the climbing personnel on the climbing straight ladder. According to the method provided by the invention, the safety of the climbing vertical ladder can be evaluated, and safety accidents are avoided.

Description

technical field [0001] The invention belongs to the technical field of safety evaluation, and relates to a method for safety evaluation of a climbing ladder. Background technique [0002] Climbing ladder is a very common climbing tool, usually made of aluminum alloy, stainless steel or wood, widely used in construction, power grid maintenance, fire rescue and other fields. Every year, there are many safety accidents caused by slipping and falling of climbing ladders, ranging from causing certain property losses to endangering the lives of users. Therefore, the safety of climbing straight ladders cannot be ignored. At present, there is no safety evaluation method specifically for climbing ladders, which makes it impossible to effectively prevent safety accidents caused by climbing ladders slipping during the design and use of climbing ladders. Contents of the invention [0003] The object of the present invention is to provide a method for evaluating the safety of a climb...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D21/02G06F17/11
CPCG01D21/02G06F17/11
Inventor 张景楠张红卫段苗苗
Owner XI'AN POLYTECHNIC UNIVERSITY