This standard specifies the general requirements for safety devices whose main objective is to prevent falls and slips. This standard applies to fixed devices designed for pedestrian access to fixed or mobile machinery. If horizontal access is used in conjunction with special access facilities (such as emergency exits or disabled access), some additional requirements may be applied in addition to this standard. GB 17888.2-1999 Mechanical safety Fixed access to machines and industrial equipment Part 2: Working platforms and passages GB17888.2-1999 Standard download decompression password: www.bzxz.net

GB 17888.2--1999
This standard is equivalent to ISO/DIS14122-2:1996 "Fixed facilities for safe access to machines and industrial equipment for machinery Part 2: Working platforms and passages" in terms of technical content. This standard is the second part of the "Fixed facilities for safe access to machines and industrial equipment for machinery" series of standards. The names of the other parts of this series of standards are: Part 1: Selection of fixed facilities for access between two levels Part 3: Stairs, steps and guardrails
Part 4: Fixed ladders
Appendix A of this standard is a prompt appendix.
This standard is proposed by the State Machinery Industry Bureau. This standard is under the jurisdiction of the National Machinery Safety Standardization Technical Committee. The responsible drafting unit of this standard: Mechanical Science Research Institute. Participating drafting units: Jilin Province Labor Protection Science Research Institute, China Standardization and Information Classification and Coding Research Institute.
The main drafters of this standard are: Li Qin, Ma Xianzhi, Shi Junwei, Xiao Jianmin, Zhang Mingxu, Cheng Hongbing, Luo Shijian. 57
National Standard of the People's Republic of China
Safety of machinery
Permanent means of access to machines and industrial plants Part 2: Working platforms and gangways
Safety of machinery
Permanent means of access to machines and industrial plants Part 2: Working platforms and gangways1Scope
This standard specifies the general requirements for safety devices whose main goal is to prevent falls and slips. GB 17888.2—1999
This standard applies to fixed devices designed for pedestrian access to fixed or mobile machinery. If horizontal access is used in combination with special access facilities (such as emergency exits or disabled access), in addition to this standard, some additional requirements may be adopted.
Cited Standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest version of the following standards. GB12265.1-1997 Machinery safety Safety distance to prevent upper limbs from touching dangerous areas GB/T15706.1-1995 Basic concepts and general design principles for machinery safety Part 1: Basic terms and methodology GB/T15706.2-1995 Basic concepts and general design principles for machinery safety Part 2: Technical principles and specifications GB/T16856--1997 Principles of risk assessment for machinery safety GB/T17889.2--1999 Ladders Part 2: Requirements, tests and markings GB17888.1-1999 Machinery safety Fixed facilities for access to machines and industrial equipment Part 1: Selection of fixed facilities for access between two levels
Machinery safety Fixed facilities for access to machines and industrial equipment Part 3: Stairs, steps and guardrails GB 17888.3-1999
GB 17888. 4—1999
3 Definitions
Safety of machinery
This standard adopts the following definitions.
3.1 Flooring
Fixed access to machinery and industrial equipment Part 4: Fixed ladders
Assembly of components that form the floor of a gangway or platform and that are in direct contact with the feet. 3.2 Gangway
Horizontal surface leading from one working platform to another. 3.3 Working platform
Horizontal surface used for operation, maintenance, inspection, repair, sampling and other work related to machinery. 3.4 Ramp
Approved by the State Administration of Quality and Technical Supervision on October 18, 1999, 58
Implementation from October 1, 2000
GB 17888.2-1999
Fixed access to facilities with an inclination of 0° to 10°. It has a flat surface without any detachable horizontal components. 3.5 Slip resistant surface Floor surface designed to increase adhesion. 4 Requirements
4.1 General requirements
All parts that may come into contact with the operator should be designed and manufactured to prevent the operator from being injured. The components such as fixings, connections, supports and layers should be stable and firm to ensure the safety of the operator during use. All parts should be able to resist the effects of climate and chemical corrosion or be covered with appropriate protective materials. The construction of each component should be arranged so that the inside and the connection are not immersed in stagnant water. The design and manufacture of a pedestrian walkway should prevent it from slipping for as long as possible. The mechanical parts on which the operator must walk or stand should be designed and equipped to prevent people from falling from it (see GB 17888.3-1999).
The dimensions of the passage and platform should be determined based on the available anthropometric data. The design and manufacture of the passage and platform should prevent the possible danger of falling objects. Where two or more materials are used, the properties of these materials are compatible. Platforms and passages should be arranged so that the operator can quickly leave his work position or can quickly get help and evacuate easily in the event of a dangerous incident.
-Handrails and other supports should be designed, manufactured and arranged so that the operator can use them naturally. It should always be possible to remove any part of the machine without removing the permanent protective barriers. 4.2 Special requirements
4.2.1 Positioning
Passages and platforms should be positioned as far away as possible from dangerous fluid spray or components that may be thrown out and where slips may occur due to the accumulation of certain materials on the ground.
Sufficient safety distance is required in the presence of moving objects, unprotected hot surfaces or live equipment (see GB12265.1-1997).
The platform should be positioned so that people can work at a height of 500 to 1700 mm above it. 4.2.2 Dimensions
The minimum clearance height above the platform and passage should be at least 2100 mm. The net length and width of the passages and work platforms intended for operation and maintenance should take into account the following factors: task requirements, such as the location, nature and speed of movement, force; whether tools, spare parts, etc. are carried;
-task, frequency of use and duration; -number of operators in the passage or platform at the same time; the possibility of one operator meeting another;
-whether additional equipment is worn, such as safety clothing or personal protective equipment; the existence of isolation barriers;
-evacuation of injured persons;
whether the end of the passage is closed;
the wall may damage or scratch the operator's clothes. The net width of a single-person passage should be at least 600mm, preferably 800mm. When the passage is frequently used or multiple people cross at the same time, the width should be increased to 1200mm. If the passage is used as an evacuation route, its width should meet the requirements of specific regulations. If there are no specific regulations, the minimum width should be 1200mm.
GB 17888.2 -1999
The clear width and clear height may be reduced in the following cases when judged by risk assessment and due to mechanical or environmental limitations: -…·The working platform or passage is only used occasionally; -*--Reduction is allowed only for short distances and the reduced clear width is at least 500mm and the clear height is 1900mm. If there are independent obstacles on the wall or under the ceiling, special protection should be provided. In order to prevent injuries, safety devices such as cushions and warning signals should be equipped, and the required clear width and clear height of independent obstacles on the wall and under the ceiling should be limited.
4.2.3 Facilities or equipmentwwW.bzxz.Net
If the height of the passage or platform is greater than 500mm, guardrails and skirting boards should be provided (see GB17888.3). Appropriate facilities should be provided for carrying heavy parts (components) without rollers or stacking them on the platform. 4.2.4 Floors
4.2.4.1 Avoiding hazards caused by stagnant and/or accumulated liquids Floors should be designed so that any liquid can flow off them. If this requirement cannot be achieved for some special reasons, other appropriate facilities should be used to prevent slips and other hazards caused by liquids. 4.2.4.2 Avoiding hazards caused by accumulated materials Floors should be designed so that they cannot accumulate oil, snow, ice, etc., nor other materials. Therefore, permeable floors such as grids or thin metal grids can be used as a priority. Where permeable floors cannot be used, facilities for removing accumulated materials should be provided when necessary. 4.2.4.3 Avoiding the danger of successive collapses
In order to avoid the danger of successive collapses, the floor should be flat and the maximum height difference between adjacent floor components should not exceed 4 mm. 4.2.4.4 Avoidance of hazards caused by falling objects To prevent hazards caused by objects falling through the floor, the floor should not have any gaps. The largest opening in the floor of a working platform or passageway should not allow a sphere with a diameter of 35 mm to fall through it. The largest opening in the floor above where people are present should not allow a sphere with a diameter of 20 mm to fall through it, otherwise other appropriate means should be used to ensure the same level of safety.
If the distance between the floor and the structure exceeds 30 mm, skirting boards must be provided between the sides of the floor or the sides of its openings and the adjacent structure.
4.2.4.5 Risk of falling through the floor
If the floor is made of removable components, such as those installed under the floor for maintenance of equipment. Any dangerous movement of the components, such as through fasteners, should be prevented; the fastening state of the attachments should be checked in order to detect any corrosion or any dangerous looseness or change in the position of the clamping parts. 4.2.4.6 Slipping hazard
The floor should have anti-slip properties. The criteria and requirements for grouping are shown in Appendix A (indicative appendix). 4.2.5 Design loads
The catalogue of working platforms and passages shall state the design loads. For occasional use by one person, the design load is usually 1500N, distributed over an area of ​​200mmX200mm. When the design load is applied, the deflection of the floor shall not exceed 1/200 of the span, and the height difference between the loaded and adjacent unloaded floor shall not exceed 4 mm.
GB 17888.2-1999
Appendix A
(Indicative Appendix)
Test method for the anti-slip performance of working surface floors (ramp test) The test device (Figure A1) is a horizontal surface and a free torsion platform with a width of 600mm, a length of 2000mm, and a longitudinal slope adjustable between 0° and 45°. The drive device enables the platform to obtain a maximum angular velocity of 1°/s in the ascending height, and in this way it takes at least 45s to adjust to the maximum angle of 45°. The ascending stroke, which can be controlled by the tester, can be selected as a continuous motion or in 0.5° steps. The angle indicator on the test device shows that the platform tilts away from the horizontal plane with an accuracy of 0.5° ± 0.2°. The tester walks downward and forward and backward on the test surface in an upright position with a step length of one foot. The slope of the test surface tilts away from the horizontal plane at a rate of about 1°/s. The critical value is defined as the slope acceptable to the tester and is determined by repeated ascent and descent of the plane within this critical value range. The gradient of the test surface relative to the horizontal plane is measured three times. Before the first, second and third tests, lubricant (motor oil) is applied to the test surface repeatedly and evenly. Then the second tester performs the same walking test. Before the test, two testers walk on each standard floor, and this calibration method is used to limit the influence of subjective factors on the test method. The slip resistance classification is determined based on the recorded average slope (see Table A1). R10 floor surface has the lowest slip resistance performance and R13 has the highest slip resistance performance.
Slip hazard classification is shown in Table A1.
Safety loading
Angle indicator
Test surface
Test device
Determination of the average value of the slope angle for relative anti-slip classification Table A1
Average value (\)
>19～27
>27～35
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