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JG/T 231-2007 (JG/T231-2007)

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JG/T 231-2007: PDF in English (JGT 231-2007)
JG/T 231-2007
Building Glass Skylight System
Issued by. Ministry of Housing and Urban-Rural Development of the
People’s Republic of China
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative References ... 4 
3 Terms and Definitions ... 5 
4 Classification and Designation ... 6 
5 General Requirements ... 7 
6 Material ... 7 
7 Performance ... 10 
8 Fabrication and Assembling Requirements ... 13 
9 Test Methods ... 22 
10 Inspection Rules ... 23 
Annex A (Informative) General Standards ... 27 
Annex B (Normative) Field Rainwater Leakage Test Method ... 29 
Annex A of this Standard is informative; Annex B is normative.
This Standard was proposed by the Institute of Standards and Quotas of the Ministry
of Housing and Urban-Rural Development of the People’s Republic of China.
This Standard shall be under the jurisdiction of the Standardization Technical
Committee on Building Products, Components and Parts of the Ministry of Housing
and Urban-Rural Development.
The responsible drafting organizations of this Standard. China Institute of Building
Standard Design & Research and China Academy of Building Research.
The participating drafting organizations of this Standard. Guangdong Provincial
Academy of Building Research, Beijing Jinyige Curtain Wall Decoration Engineering
Co., Ltd., Shenzhen Sanxin Special Glass Technology Co., Ltd., Shenzhen Fangda
Decoration Engineering Co., Ltd., Shenyang Yuanda Aluminium Industry Engineering
Co., Ltd., Shanghai Hanart Façade Specialist Co., Ltd., Shanghai Kesheng Curtain
Wall Co., Ltd., Beijing Shenlong Construction Decoration Engineering Co., Ltd., Hong
Kong Kin Long Construction Hardware (Group) Co., Ltd., CSG Holding Co., Ltd.,
Hangzhou Zhijiang Silicone Chemicals Co., Ltd., Zhuhai King Ceberal Engineering Co.,
Ltd., Jiangsu Hoovercool Group Co., Ltd., Beijing Jianli Aluminium Doors Windows and
Wall Co., Ltd. Zhengzhou Zhongyuan Silande High Technology Co., Ltd., Guangzhou
Baiyun Chemical Industry Co., Ltd., Chengdu Guibao Science and Technology Co.,
Ltd. and Guangdong Golden Curtain Wall Group Co., Ltd..
The main drafters of this Standard. Gu Taichang, Wang Hongtao, Long Wenzhi, Yang
Shichao, Ban Guangsheng, Zhang Guixian, Xie Shitao, Cui Qinghui, Zhan Shuwu,
Yang Renjie, Hu Zhongming, Wei Donghai, Bai Baokun, Xu Wuyi, Liu Ming, Wang
Deqin, He Guoxiang, Sun Deyan, Zhang Deheng, Zhang Guanqi, Li Buchun, Huang
Qingwen, Fang Zheng, Liu Huitao and Yu Liyun.
This Standard was issued for the first time.
Building Glass Skylight System
1 Scope
This Standard specifies the terms and definitions, classification and designation,
general requirements, materials, performances, fabrication and assembling
requirements, test methods, inspection rules and marking, packaging, transportation
and storage of the building glass the skylight system (hereinafter referred to as the
skylight systems).
This Standard applies to the building glass skylight systems; it can be used as a
reference for building glass awnings.
2 Normative References
The provisions in the following documents become part of this Standard through
reference in this Standard. For dated documents, the subsequent amendments
(excluding corrigenda) or revisions do not apply to this Standard. However, all parties
who enter into agreement based on this Standard are encouraged to study whether
the latest versions of these documents are applicable. For undated documents, the
latest versions apply to this Part.
GB 5237 (all parts), Wrought aluminium alloy – Extruded profile for architecture
GB/T 5574, Industrial rubber sheet
GB/T 6388, Transport package shipping mark
GB/T 8484-2002, Graduation and test method for thermal insulating properties of
GB/T 8485-2002, The graduation and test method for airborne sound insulating
properties of windows
GB/T 11944, Insulating glass unit
GB/T 11976-2002, Graduation and test method for daylighting properties of
GB/T 13306, Plate
GB/T 15227-2007, Test method of air permeability, water tightness, wind load
resistance performance for curtain walls
GB 15763.2, Safety glazing materials in building – Part 2. Tempered glass
GB 15763.3, Safety glazing materials in building – Part 3. Laminated glass
GB 16776, Structural silicon sealants for building
GB 17841, Tempered and heat-strengthened glass used in curtain walls
GB 50009, Load code for the design of building structures
GB 50011, Code for seismic design of buildings
GB 50016, Code of design on building fire protection and prevention
GB 50045, Code for fire protection design of tall civil buildings
GB 50057, Design code for protection of structures against lightning
GB 50205, Code for acceptance of construction quality of steel structures
JG 138, The support device of point supported glass curtain wall
JG/T 174, Rigid plastic thermal barrier strip for buildings
JG/T 200, Stainless steel strand for structures
JG/T 201, Swaged fitting of steel strand for curtain wall
JGJ/T 16, Code for electrical design of civil buildings
JC/T 486, Elastic sealants for insulating glass
JC/T 882, Sealants for joint glass curtain wall
JC/T 914, Hot melt butyl sealant for insulating glass
JC/T 915, Heat bent glass
HG/T 3100, Specifications for preformed solid vulcanized rubber materials of glass
window and panel sealed by building rubber gasket
3 Terms and Definitions
For the purpose of this document, the following terms and definitions apply.
roof plate
the plate which directly bears roof load and effect
6.2 Glass
6.2.1 The glass used for the skylight system shall be safety glass, preferably
insulating glass and laminated insulating glass. Glass sheets can be used in
accordance with the design requirements, and the thickness of glass sheets shall not
preferably be smaller than 6 mm and the thickness of glass sheets of laminated glass
shall not preferably be less than 5 mm.
6.2.2 When tempered glass is used for the skylight system, it shall be as specified in
GB 15763.2 and heat-strengthened glass shall be as specified in GB 17841 and
tempera; tempered glass is preferably treated with secondary homogenizing.
6.2.3 The laminated glass used for the skylight system shall also meet the following
requirements, in addition to the requirements of GB 15763.3.
a) laminated glass is preferably dry processed with the difference between two
sheets of laminated glass is preferably not greater than 2 mm;
b) the sealant for laminated glass is preferably polyvinyl butyral (PVB) sealant; the
thickness of PVB sealant shall not be less than 0.76 mm; and
c) the margins of laminated glass exposed to air shall be seal processed.
6.2.4 The laminated insulating glass used for the skylight system shall meet the
following requirements in addition to the provisions in 6.2.3 and GB/T 11944.
a) the thickness of the gas layer of insulating glass shall not be smaller than 12 mm;
b) insulating glass shall be of dual-sealed structure. the dual sealing of hidden frame
glass shall be with silicone structure sealant;
c) the sandwich layer of insulating glass shall be located on the lower surface of
insulating glass; and
d) when the altitude difference between the manufacturing place and the using
place or transporting route is greater than 1 000 m, it is preferable to add capillary
tubes or breathing tubes to balance the inside and outside pressure differences.
6.2.5 All glass of the skylight system shall be edge ground and chamfered.
6.3 Steel
6.3.1 Carbon structural steel, low-alloy high-strength structural steel and weathering
resistant steel and others used for the Support structure of the skylight system shall be
as specified in relevant national standards; and corrosion resistant treatment shall be
done in accordance with the design requirements.
6.3.2 Stainless steel is preferably austenitic stainless steel whose nickel content shall
not be smaller than 8%.
6.6.3 The load-carrying capacity and service life of the hardware accessories shall
be capable of meeting the design requirements; the carrying capacity checking
computation shall be conducted for the major force-bearing hardware.
6.7 Sealing material
6.7.1 The rubber products shall be as specified in HG/T 3100 and GB/T 5574; they
are preferably EPDM, neoprene and silicone rubber.
6.7.2 The properties of silicone structural sealant shall be as specified in GB 16776.
Before use, a state-approved testing institution conducts the tests for the compatibility
with the organic materials in contact with it and the peeling adhesion performance of
the materials adhered; and conducts retests for shore hardness and standard state
tensile adhesi...
(Above excerpt was released on 2017-03-06, modified on 2021-06-07, translated/reviewed by: Wayne Zheng et al.)
Source: https://www.chinesestandard.net/PDF.aspx/JGT231-2007