JG/T 231-2018Technical requirements of building glass skylight system (English PDF)

4.1 Classification

4.1.1 According to the supporting structure, it can be divided into steel structure (G), cable rod structure (S), aluminum alloy structure (L), glass beam structure (B).

4.2 Marks

4.2.1 Marking method

The mark is composed of the product code of the glass skylight system (CGD), standard code, support structure category code, opening-closing category code, closed category code, and main parameters (structural performance).

4.2.2 Marking example

Example. CGD-S-K-FB/3.5-JG/T231, which represents a closed glass skylight system that is supported by cable rod structure, is openable, the structural performance is 3.5kPa and complies with the industrial standard JG/T 231.

5.8 The durability of glass skylight system, anti-condensation (frost, ice) and

hail resistance shall meet the design requirements.

5.15 The visible light transmittance of glass skylight system shall meet the lighting design requirements. A glass panel with visible light reflectance not greater than 0.30 is preferred.

6.1 Aluminum alloy profile

6.1.1 The base material of aluminum alloy profile shall meet the requirements of GB/T 5237.1.The allowable size deviation shall meet the requirements of high precision or ultra-high precision.

6.1.2 When aluminum alloy profiles using anodizing, electrophoretic painting, powder spraying, fluorocarbon paint spraying for surface treatment, it shall respectively comply with the requirements of GB/T 5237.2, GB/T 5237.3, GB/T

5237.4, and GB/T 5237.5.The thickness of the surface treatment layer shall meet the requirements of Table 1.

6.3 Pull rod

6.3.1 Steel ropes for glass skylight system shall use steel strands. The nominal diameter of the steel strand of the main load steel rope shall not be less than

12mm and shall meet the design requirements.

6.3.2 Zinc-5% aluminum-mixed rare earth alloy coated steel strands shall meet the requirements of GB/T 20492.Other steel strands shall meet the requirements of GB/T 5224.Stainless steel strands shall meet the requirements of GB/T 25821 and JG/T 200.

6.4.4 In addition to the requirements of 6.4.3 of this Standard and GB/T 11944, the laminated insulating glass for glass skylight system shall also meet the following requirements.

6.4.6 The glass for photovoltaic glass skylight system shall meet the requirements of JGJ 113.

6.5 Hardware

6.5.1 The hardware for glass skylight system shall comply with the relevant national standards. See Annex A for common material standards.

6.5.2 In addition to stainless steel, hardware for glass skylight system shall be anti-corrosive.

6.5.3 The bearing capacity and service life of the hardware shall meet the design requirements. Check the bearing capacity of main stressed hardware.

6.6 Sealing material

6.9 Other materials

6.9.1 Padding material for the top joints of glass skylight system shall use polyethylene foam stick. The density shall not be greater than 37kg/m3.

6.9.2 Graduation of combustion performance of insulation materials for glass

skylight system shall comply with relevant requirements of GB 8624.Non- combustible or flame-retardant materials such as rock wool, mineral wool, glass wool shall be used.

7.1 Glass production requirements

7.1.1 The size and allowable deviation of rectangular tempered glass shall meet the requirements of Table 2.

feeler

7.1.3 The size and allowable deviation of rectangular insulating glass panels

shall meet the requirements of Table 4.

7.1.4 The size and allowable deviation of triangle, rhombus, parallelogram, trapezoid, round panels shall meet the requirements of Table 5.

7.3.1.3 Components shall meet design requirements. The allowable deviation of component assembly shall meet the requirements of Table 12.

7.3.2 Cable rod structure

The appearance of the steel cable shall meet the design requirements, without rust spots on the surface. Steel strands shall not have broken wires or other obvious mechanical damage. The stainless-steel strands for cable structure shall meet the relevant requirements of GB/T 25821 and JG/T 200.The allowable deviation of the processing of cable components shall meet the requirements of Table 13.

8.1 Structural performance

8.1.1 Structural performance of glass skylight system shall include possible wind load, stagnant load, snow load, ice load, sunshade device and lighting device loads, live loads and other loads. Combine the various loads and effects on the glass skylight system in a direction perpendicular to the glass skylight system according to GB 50009 and GB 50011.Take the combined load standard value under the most unfavorable conditions as the performance indicator of the glass skylight system.

8.6 Photothermal performance

The photothermal performance of glass skylight system is expressed by light- to-heat ratio (r or LSG). The graduation shall meet the requirements of Table

23.

8.7 Thermal cycling performance

8.7.1 There shall be no condensation on the test piece during the thermal cycling test, without dysfunction or damage.

8.7.2 The thermal cycling performance of glass skylight system shall meet the following requirements.

9.1 Structural performance

The structural performance testing of glass skylight system shall be performed in accordance with GB/T 34555.

9.4 Insulation performance

The insulation performance testing of glass skylight system shall be performed in accordance with GB/T 29043.When testing, the test piece shall be installed at the actual angle. The insulation performance can also be calculated according to the method specified by JGJ/T 151.

9.6 Photothermal performance

9.6.1 The measurement of visible light transmittance shall be performed in accordance with GB/T 2680.Visible light transmittance of glass skylight system can be calculated according to JGJ/T 151.

9.7 Thermal cycling performance

Thermal cycling performance of glass skylight system can be implemented according to JG/T 397.When testing, the test piece shall be installed at the actual angle.

......