Safety grab bar and safety handrail are the most commonly used barrier free handrail facilities and equipment.
Grab bar handrails can be divided into two categories: the first is walking auxiliary handrail and the second is action auxiliary handrail. Walking auxiliary handrails are generally set in walkways, stairs, etc. users hold the handrails and slide forward. Handrails are tools to assist people to move safely, such as continuous horizontal handrails set in barrier free passages. The motion auxiliary handrail is generally set in the toilet, bathroom, etc. users hold the handrail and support it hard to help them stand, sit down or maintain a specific posture of their body, such as the common L-shaped handrail in the barrier free toilet, the fixed or folded handrail next to the toilet, etc.
In the actual barrier free project, we found that many handrails or grab rods are not fixed firmly enough, especially the performance of bearing lateral force is very poor, and it is easy to loosen and damage if shaking with a little force. The reasons are as follows:
On the one hand, the provisions of relevant accessibility specifications are relatively general and not detailed enough, and there is also a lack of corresponding testing basis. For example, there is no specific numerical requirement for the load bearing capacity of grab bar handrail in the accessibility design code. Although the stress strength of handrail is further specified in the relevant accessibility technical guide, which requires that "handrail shall be firmly installed and can bear the weight of more than 100kg", there is no description on the side stress of handrail, It is easy to ignore the requirements of handrail on side force.
On the other hand, the designers and constructors lack understanding of the significance of relevant accessibility specifications and accessibility concepts, especially the physiological and living characteristics of the disabled, and their safety awareness when installing and fixing barrier free products is weak. In addition, compared with foreign barrier free facilities and equipment, China, especially in the industrial assembly of barrier free toilets and showers, has a relatively low degree of industrialization, few types of barrier free products, and has not formed an organic and complete barrier free product industrial chain, resulting in the lack of corresponding products, and the installation of barrier free products also lacks corresponding technical standards.
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