GB/T 24721.4-2023Glass fiber reinforced plastic product for highway—Part 4:Non-pressure communications well lid (English PDF)
公路用玻璃纤维增强塑料产品 第4部分：非承压通信井盖
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
March 17, 2023
Implementation date
July 1, 2023
Scope
GB/T 24721.4-2023 is the English-translated version of 公路用玻璃纤维增强塑料产品 第4部分：非承压通信井盖.
GB/T 24721.4-2023 is Part 4 of GB/T 24721 and covers glass fibre reinforced plastic non-pressure communication well lids for highways.
It specifies their structure, dimensions and deviations, model, technical requirements, test methods, inspection rules and the marking, packaging and storage, and applies to their production, inspection and use in highway areas where vehicles do not drive.
It defines the communication well lid, the seating and the depth of insertion, and its test methods cover the nominal outer diameter or side length, the insertion depth, the total clearance, the bearing surface width, appearance quality, density, Barcol hardness, flame retardancy, smoke density, water and chemical resistance and environmental adaptability, mostly by methods of GB/T 24721.1-2023; the overall bearing capacity is determined in a normative annex.
It replaces GB/T 24721.4-2009, was issued on 17 March 2023 and has applied since 1 July 2023.
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Document preview — GB/T 24721.4-2023
National Standard of the People's Republic of China
- ICS
- 03.220.20
- Classification
- P 66
- Replacing
- GB/T 24721.4-2009
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- Foreword3
- Introduction5
- 1 Scope6
- 2 Normative References6
- 3 Terms and Definitions6
- 4 Structure, Dimensions, Deviations and Model7
- 5 Technical Requirements9
- 6 Test Methods10
- 7 Inspection Rules13
- 8 Marking, Packaging, Transportation and Storage14
- Appendix A (normative) Determination Method for Overall Bearing Capacity15
Foreword
This document was drafted in accordance with the rules provided in GB/T 1.1-2020 Directives for Standardization - Part 1: Rules for the Structure and Drafting of Standardizing Documents.
This document is Part 4 of GB/T 24721 Glass Fiber Reinforced Plastic Product for Highway.
GB/T 24721 has issued the following parts:
---Part 1: General Rule;
---Part 2: Trunk;
---Part 3: Duct;
---Part 4: Non-pressure Communications Well Lid;
---Part 5: Sign Base Panel.
This document serves as a replacement of GB/T 24721.4-2009 Glass Fiber Reinforced Plastic Product for Highway - Part 4: Non-pressure Communications Well Lid. In comparison with GB/T 24721.4-2009, apart from structural adjustments and editorial modifications, the main technical changes are as follows:
a) The definitions of the terms "total clearance" and "clear opening of well lid" are modified (see 3.4 and 3.6; 3.4 and 3.6 of Version 2009);
b) The product classification is deleted (see 4.1 of Version 2009);
c) The expression method of product model is modified (see 4.2; 4.3 of Version 2009);
d) The requirements for the properties of raw materials are deleted (see 5.1.1 of Version 2009);
e) The technical requirements for the appearance quality are modified (see 5.1; 5.1.2 of Version 2009);
f) The technical requirements and test methods for flame retardancy are modified (see Table 2 and 6.7.3; Table 2 and 6.5.3.3 of Version 2009);
g) The technical requirements and test methods for smoke density are added (see Table 2 and 6.7.4);
h) The technical requirements and test methods for artificial accelerated aging resistance (fluorescent ultraviolet light source) are added (see Table 2 and 6.11.4);
i) The technical requirements for natural exposure resistance are modified (see Table 2; Table 2 in 5.2 of Version 2009);
1 Scope
This document specifies the structure, dimensions and deviations, model, technical requirements, test methods, inspection rules, as well as marking, packaging, transportation and storage requirements of glass fiber reinforced plastic non-pressure communication well lid products for highway.
This document is applicable to the production, inspection and usage of glass fiber reinforced plastic non-pressure communication well lid (hereinafter referred to as "glass fiber reinforced communication well lid") for non-vehicle driving areas on highways.
2 Normative References
The contents of the following documents constitute indispensable clauses of this document through the normative references in the text. In terms of references with a specified date, only versions with a specified date are applicable to this document. In terms of references without a specified date, the latest version (including all the modifications) is applicable to this document.
GB/T 24721.1-2023 Glass Fiber Reinforced Plastic Product for Highway - Part 1: General Rule
3 Terms and Definitions
The following terms and definitions are applicable to this document.
3.1 Communication well lid
Communication well lid refers to a closure with openable communication well head.
NOTE: it is composed of a support (mouth ring) and a well lid.
3.2 Seating
Seating refers to a part fixed at the well head for placing and supporting the well lid.
3.3 Depth of insertion
Depth of insertion refers to the distance from the bearing surface to the top surface of the support.
6 Test Methods
6.2 Reagents
In accordance with the method of 6.2 in GB/T 24721.1-2023, conduct the test.
6.3 Test Instruments and Equipment
In accordance with the method of 6.3 in GB/T 24721.1-2023, conduct the test.
6.4 Specimen
6.4.1 General requirements
In accordance with the method of 6.4 in GB/T 24721.1-2023, conduct the test.
6.4.2 Special stipulations
When it is impossible to prepare specimens on the finished product, the same raw materials and the same process method as the product shall be used to prepare specimens with a uniform planar structure and a thickness of 5.0 mm ± 0.2 mm. There are no special restrictions on the size of the specimens, but at least it shall be guaranteed that 200 mm x 200 mm test pieces can be punched and sheared, and the total area of the specimens shall not be less than 0.24 m².
The preparation of flexural strength specimens shall also include the same number of comparative specimens with the properties retention rate of water resistance, damp heat resistance and weather resistance.
6.5 Structures and Dimensions
6.5.1 Nominal outer diameter or side length of well lid
Use a steel ruler or steel tape with a division value of 1 mm to conduct the measurement. On the surface of the well lid, uniformly measure-take 3 diameter values or 3 side length values of length and width; take the arithmetic mean as the measurement result.
6.5.2 Insertion depth of well lid
Use a depth gauge with a division value not greater than 0.02 mm to measure the insertion depth of the well lid at two mutually perpendicular axes; take the arithmetic mean of 4 values as the measurement result.
6.5.3 Total clearance of well lid
Use a steel ruler or steel tape with a division value of 1 mm to measure the diameter of side length of two mutually perpendicular holes on the support; take the arithmetic mean as the measurement result, then, subtract the nominal outer diameter or corresponding side length of the well lid to obtain the total clearance.
6.5.4 Width of bearing surface
Use a caliper with a division value not greater than 0.02 mm to measure the width of the bearing surface at two mutually perpendicular axes of the support.
6.5.5 Contact surface height of well lid
Use a depth gauge with a division value not greater than 0.02 mm to measure the height of the contact surface at two mutually perpendicular axes of the well lid; take the arithmetic mean of 4 values as the measurement result.
6.6 Appearance Quality
In accordance with the method of 6.5 in GB/T 24721.1-2023, conduct the test. For the raised height of the anti-skip patterns, use a depth gauge with a division value not greater than 0.02 mm to measure any 3 points; take the arithmetic mean as the measurement result.
6.7 General Physical and Mechanical Properties
6.7.1 Density
In accordance with the method of 6.6.5 in GB/T 24721.1-2023, conduct the test.
6.7.2 Barcol hardness
In accordance with the method of 6.6.6 in GB/T 24721.1-2023, conduct the test.
6.7.3 Flame-retardancy
In accordance with the method of 6.7 in GB/T 24721.1-2023, conduct the test.
6.7.4 Smoke density
In accordance with the method of 6.8 in GB/T 24721.1-2023, conduct the test.
6.8 Overall Bearing Capacity
In accordance with the method of Appendix A, conduct the test.
6.9 Water Resistance
In accordance with the method of 6.10 in GB/T 24721.1-2023, conduct the test.
6.10 Resistance to Chemical Media
In accordance with the method of 6.11 in GB/T 24721.1-2023, conduct the test.
6.11 Environmental Adaptability
6.11.1 Damp heat resistance
In accordance with the method of 6.12.1 in GB/T 24721.1-2023, conduct the test. […]
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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.
Referenced standards
Similar standards
Editions of GB/T 24721.4
| Edition | Title | Revision | Status |
|---|---|---|---|
| GB/T 24721.4-2023 | Glass fiber reinforced plastic product for highway—Part 4:Non-pressure communications well lid | current edition | Current |
| GB/T 24721.4-2009 | Glass fiber reinforced plastic product for highway—Part 4:Non-pressure communications well lid | previous edition | Superseded |
This page sells the current edition, GB/T 24721.4-2023. Earlier editions are listed for reference only.
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Related Standards
GB/T 24721.1-2023 — Glass fiber reinforced plastic product for highway - Part 1: General rule
GB/T 24721.3-2023 — Glass fiber reinforced plastic product for highway—Part 3:Duct
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