General technical conditions on the ladder of standard series – fire ladders, eq
4. Technical requirements 4.1 General 4.1.1 Fire ladders should comply with the provisions of this standard, in accordance with prescribed procedures approved by the drawings and technical documents create.
4.1.2 ladder assembly and the parts and components shall meet the following requirements:
A) home-made parts to be tested by qualified factory quality inspection department;
B) items purchased should comply with the provisions of relevant standards; purchased parts, and coordination, should have a certificate, and pass inspection by the quality inspection department, with acceptance mark. If there are changes in technology, subject to the design department agrees and issuing;
C) material properties shall conform to the provisions of the relevant standards and shall have a certificate of competency or quality guarantee, subject to the design department of alternative raw materials and issuing consent.
4.1.3 combination of bamboo wood fire ladders, wooden ladders in accordance with the implementation of performance requirements.
4.2 Materials 4.2.1 steel used in steel ladders should comply with the provisions of GB114253.
4.2.2 Aluminum ladder and the materials should be consistent with the provisions of GB6892.
4.2.3 wooden ladders used by timber shall meet the following requirements:
A) side with larch, oak staircase with a pedal or Ash.
B) ladder tread the wood fiber and wood should not exceed 1:10 slope. Tenon site there should be no detrimental defect strength, and the rest only allow the maximum diameter of no more than two 6mm wooden section.
C) pull ladder side voluminous material is allowed no more than a 25% wood section, the material of wood 1m long section should not exceed the number of one tongue and groove around 100mm or less should not be any knot.
Bar ladder side except mandrel, the material can be voluminous size of not more than 25% of the wood section.
Hook ladder side full of wood fiber through cross-sectional area of not less than 60%, but should not have knots, decay, insects, skin defects such as cracks and folders.
4.2.3.1 In addition to groove wood parts, assembled parts, the allowed does not affect the strength of the resin capsule (oil eyes), but the need to remove the resin bag and filled epoxy putty.
4.2.4 Side bamboo ladder, ladder tread more than four years with the growth period of bamboo, bamboo and other bamboo main bar, through corrosion, moth, after drying glue laminated timber. Bamboo laminated adhesive bonding by 5.3.1 ~ 5.3.5 fastness test method, no degumming phenomenon.
4.2.5 bamboo, wood moisture content after drying should be 8% to 15%.
4.2.6 New materials ladder materials used should conform to their own standards.
4.3 the whole staircase 4.3.1 ladder tread shall be closely fitted with the side panel, not loosening, plus wedge. Metal ladders should have non-slip tread measures.
4.3.2 metal and bamboo, wood parts should be close fitting and should not fill plug.
4.3.3 fasteners should be tightened vertically, front nail head should not be prominent mouth and burrs and other defects. Rivets should be fastened and into the light the whole round head.
4.3.4 ladder outside surface should be smooth burr-free surface should be coated to protect non-conductive coating, bamboo, wood surface was orange, metal parts galvanized (or Chrome), or painted black enamel. Coating the surface brightness, color uniform, seamless coating, flow marks and impact the quality of the outer surface of the defects.
4.3.5 to start the fire ladder, and condensation should be flexible and reliable, there should be no jamming phenomenon.
4.3.5.1 pull ladder in the process of expansion and condensation, the stopper should be reliable; two support legs can also rated highly reliable support in any of the following landed on a ladder, and should ensure Push the two support legs of the ladder not cause any form of injury.
4.3.5.2 bar ladder has started, the visual angle between the ladder tread and the side should be at right angles to both sides of plate after equivalent should be no warping, and skew.
4.3.6 greater than or equal 12m ladder should be equipped with a rod of fire, supporting bar should be securely fixed to the bottom of the ladder Festival.
4.4 Performance 4.4.1 state fire ladder at work, each ladder tread to withstand the maximum static load rating should be consistent with the provisions of Table 2.
4.4.2 ladder set forth in the standard test, the metal parts should not be any damage, visible deformation and crack.
4.4.3 ladder should be 5.4 ~ 5.14, test methods, the results should be consistent with the provisions of 4.4.3.1 ~ 4.4.3.11.
4.4.3.1 residual deformation ratio of the bend: 6m and 6m below the horizontal bar bamboo ladder, pulling ladder should not exceed 0.15%; other materials ladder should not exceed 0.10%. 6m above the fire ladder should not be more than 0.30%. Hook ladder should not exceed 0.20%.
4.4.3.2 Single side panels on both sides of the maximum bending value and the angle between the deformation of the provisions should be consistent with Table 3.
4.4.3.3 ladder tread bending residual deformation ratio, wooden ladder shall not exceed 1.0%; other materials ladder should not exceed 0.5%.
Table 2
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