GB/T 17888.2-2020 in English

《GB/T 17888.2-2020机械安全 接近机械的固定设施 第2部分：工作平台与通道》由TC208（全国机械安全标准化技术委员会）归口，主管部门为国家标准化管理委员会。

ChinaStandards.net is in charge of this English translation. In case of any doubt about the English translation, the Chinese original shall be considered authoritative.

GB/T 17888 Safety of machinery—Permanent means of access to machinery consists of the following four parts:

——Part 1: Choice of fixed means and general requirements of access;

——Part 2: Working platforms and walkways;

——Part 3: Stairs, stepladders and guard-rails;

——Part 4: Fixed ladders.

This is Part 2 of GB/T 17888.

This part is developed in accordance with the rules given in GB/T 1.1-2009.

This part replaces GB/T 17888.2-2008 Safety of machinery—Permanent means of access to machinery—Part 2: Working platforms and walkways, with respect to which, the technical changes in Annex B have been made.

This part is a translation identical to ISO 14122-2: 2016 Safety of machinery—Permanent means of access to machinery—Part 2: Working platforms and walkways.

The Chinese document consistent and corresponding with the normative international document in this part is as follows:

——GB/T 8196-2018, Safety of machinery—Guards—General requirements for the design and construction of fixed and movable guards (ISO 14120: 2015, IDT)

——GB/T 15706-2012, Safety of machinery—General principles for design—Risk assessment and risk reduction (ISO 12100: 2010, IDT)

——GB/T 18717.1-2002, Ergonomic design for the safety of machinery—Part 1: Principles for determining the dimensions required for openings for whole-body access into machinery (ISO 15534-1: 2000, NEQ)

——GB/T 18717.3-2002, Ergonomic design for the safety of machinery—Part 3: Anthropometric data (ISO 15534-3: 2000, NEQ)

——GB/T 17888.1-2020, Safety of machinery—Permanent means of access to machinery—Part 1: Choice of fixed means and general requirements of access (ISO 14122-1: 2016, IDT)

——GB/T 17888.3-2020, Safety of machinery—Permanent means of access to machinery—Part 3: Stairs, stepladders and guard-rails (ISO 14122-3: 2016, IDT)

——GB/T 23821-2009, Safety of machinery—Safety distances to prevent hazard zones being reached by upper and lower limbs (ISO 13857: 2008, IDT)

Editorial changes have been made in this part as follows:

——The symbol h of head-height is modified to e;

——The logical relationship of specific requirements in 4.2.4.5.2 when the gap is greater than 20mm is adjusted;

——The symbol h of the height in Figure 3 is modified to a.

This part was proposed by and is under the jurisdiction of SAC/TC 208 National Technical Committee on Mechanical Safety of Standardization Administration of China.

The previous editions of this part are as follows:

——GB17888.2-1999 and GB/T 17888.2-2008.

 
Introduction

The architecture of safety standards in mechanical field is as follows:

——Class A standards (basic safety standards), specifying the basic concepts, design principles and general characteristics applicable to all machines;

——Class B standards (general safety standards), involving a kind of safety feature of machinery or a kind of widely used safety device:

 Class B1, standards for safety features (such as safety distance, surface temperature and noise);

 Class B2, standards of safety device (such as two-hand control device, interlocking device, pressure sensitive device, protective device).

——Class C standards (safety standards for mechanical products), specifying detailed safety requirements for a specific machine or a group of machines.

According to GB/T 15706, this part of GB/T 17888 belongs to Class B.

This part is particularly relevant to the following parties concerned with mechanical safety:

——machine manufacturer;

——health and safety agency.

Other parties concerned affected by the mechanical safety level are:

——machine user;

——machine owner;

——service provider;

——consumer (for machinery intended to be used by consumers).

All the above parties concerned may participate in the drafting of this part.

In addition, this part is intended to be used by standardization organizations drafting Class C standards.

The requirements specified in this part may be supplemented or modified by Class C standards.

For machines that are within the scope of Class C standards and have been designed and manufactured according to such standards, the requirements in Class C standards shall be preferred.

The purpose of GB/T 17888 is to define the general requirements for safe access to machines. GB/T 17888.1 gives guidance about the correct choice of access means when the necessary access to the machine is not possible directly from the ground level or from a floor or platform.

The dimensions specified in this part are consistent with the ergonomic data given in ISO 15534-3.

Safety of machinery—Permanent means of access to machinery—
Part 2: Working platforms and walkways

1 Scope

This part of GB/T 17888 gives requirements for non-powered working platforms and walkways which are a part of a stationary machine, and to the non-powered adjustable parts (e.g. foldable, sliding) and movable parts of those fixed means of access.

Note 1: “Fixed” means of access are those mounted in such a manner (for example, by screws, nuts, welding) that they can only be removed by the use of tools.

This part specifies minimum requirements that also apply when the same means of access is required as the part of the building or civil construction (e.g. working platforms, walkways) where the machine is installed, on condition that the main function of that part of the construction is to provide a means of access to the machine.

Note 2: Where no local regulation or standards exist, this part can be used for means of access which are outside the scope of the standard.

It is intended that this part be used with GB/T 17888.1 to give the requirements for walking platforms and walkways.

The GB/T 17888 series as a whole is applicable to both stationary and mobile machinery where fixed means of access are necessary. It is not applicable to powered means of access such as lifts, escalators, or other devices specially designed to lift persons between two levels.
 
2 Normative references

The following documents are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

ISO 12100 Safety of machinery—General principles for design—Risk assessment and risk reduction
ISO 13857 Safety of machinery—Safety distances to prevent hazard zones being reached by upper and lower limbs

ISO 14120 Safety of machinery—Guards—General requirements for the design and construction of fixed and movable guards
ISO 14122-1: 2016 Safety of machinery—Permanent means of access to machinery—Part 1: Choice of fixed means and general requirements of access
ISO 14122-3: 2016 Safety of machinery—Permanent means of access to machinery—Part 3: Stairs, stepladders and guard-rails
ISO 15534-1: 2000 Ergonomic design for the safety of machinery—Part 1: Principles for determining the dimensions required for openings for whole-body access into machinery
ISO 15534-3: 2000 Ergonomic design for the safety of machinery—Part 3: Anthropometric data

3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 12100 and ISO 14122-1 and the following apply.

3.1
flooring
assembly of elements making up the floor of a walkway (3.2) or a working platform (3.3) and being in direct contact with footwear

3.2
walkway
level or inclined surface used for moving from one point to another

3.2.1
maneuverable walkway
level or inclined surface used for moving, installed at the machine permanently, and intended to be shortened, elongated, or altered in its position

Note: This includes foldable, slidable, adjustable and/or hinged to, or slid from an adjacent platform or walkway.

3.3
working platform
horizontal level surface used for the operation, maintenance, inspection, repair, sampling, and other phases of work in connection with the machinery

3.3.1
maneuverable platform
level surface used for operation, installed at the machine permanently, and intended to be shortened, elongated, or altered in its position

Note: This includes foldable, slidable, adjustable and/or hinged to, or slid from an adjacent platform or walkway (3.2).

3.4
slip resistant surface
flooring surface designed for improving the grip of footwear

3.5
baseboard
filler plate between working platform (3.3) and adjacent construction element

3.6
toe-plate
rigid vertical plate on a landing platform or flooring (3.1) to prevent the fall of objects from a floor level

Note: See Figure 2 and ISO 14122-3: 2016, Figure 2.

3.7
access gauge
space to be cleared of any structures, obstacles, and obstruction in order to enable access

3.8
head-height
minimum vertical distance, cleared of all obstacles (such as beams, ducts, etc.) above the pitch line

Note: e in Figure 1.

4 General requirements

4.1 General principles

4.1.1 Construction and materials

Working platforms and walkways shall be designed and constructed and the materials selected so that they withstand the foreseeable conditions of use. In particular, at least the following details shall be taken into account:

a) Walkways and working platforms shall be designed and constructed to prevent the hazards due to falling objects. For guard-rails and toe-plates, see ISO 14122-3: 2016, Clause 7, and for openings in the flooring, see 4.2.4.5.

b) The removal of any part of the machine shall, as far as practicable, be possible without removing guard-rails, pieces of flooring, or other permanent protective barriers.

Foreword i
Introduction iii
1 Scope
2 Normative references
3 Terms and definitions
4 General requirements
5 Information for use for working platforms and walkways
Annex A (Informative) Different methods of determining levels of slip-resistance
Annex B (Informative) Significant technical changes between GB/T 17888.2-2020 and GB/T 17888.2-
Bibliography