CB/T 73-1999 Marine steel ladder

CB/T 73-1999 Marine Steel Ladder CB/T73-1999 Standard download decompression password: www.bzxz.net

CB/T73-1999 Steel Vertical Ladders for Ships
National Standard of the People's Republic of China
Steel Vertical Ladders for Ships
Shipssteelverticalladders
2023-10-03
UDC.629.12
.011.57
GB3892-83
Adjustment: B B-1997
The vertical ladders specified in this standard are applicable to cabins, trunks, poles, derricks, deckhouses, etc. on board, but not to cargo holds and oil tanks.
The types of steel vertical ladders are in accordance with Table 1.
Round steel steps
Square steel steps
Steel pipe steps
The types and basic dimensions of A-type steel vertical ladders are in accordance with Figure 1 and Table 2. Issued by the National Bureau of Standards on October 23, 1983
300, 350
300, 350
300, 400
600~6000
6003600
Implemented on May 1, 1984
GB3892-83
1-Flat steel ladder frame; 2-Round steel step; 3-Fixed plate; 4-Hexagonal bolt; 5-Hexagonal nut; 6-Washer When L>2500mm, an eye plate is added at an approximately equidistant position in the middle to fix it. When the ladder is installed on the pole, the effective distance between the step and the pole should be 150mm*The number less than 300mm from the deck can be determined by the user. Deck
Number of steps
GB8892-83
GB3892-83
Type and basic dimensions of B-type steel straight ladders are as shown in Figure 2 and Table 3. Figure 2
1-Required steel ladder wings: 2-A row of steel steps, 3-Circumferential fixed eye: 4-Hexagonal bolts; 5-Hexagonal nuts; 6-Washers. When L>2500mm, an eye plate is added at approximately equidistant positions in the middle to fix it. When the ladder is installed on the pole, the effective distance between the step and the pole should be 150mm. The number less than 300mm from the deck can be determined by the user. No.
Number of steps
GB8892-65
GB3892-83
The types and basic dimensions of C-type steel straight ladders are in accordance with Figure 3 and Table 4@38
1-flat steel ladder frame, 2-steel pipe step, 3-fixed eye plate, 4-hexagonal bolt; 5-hexagonal nut; 6-washer; 7-ladder frame sleeve, 8-a sleeve cover plate. The number less than 300mm from the deck can be determined by the user. 6
Marking example
Number of steps
GB3892-93
Steel tube step ladder with ladder width of 400mm:
Ladder length 3600mm,
Steel ladder C400×3600GB3892--83Steel ladders should meet the requirements of this standard and be manufactured according to the unified drawings. Steel ladder parts and standard parts
Steel pipe material is No. 10 high-quality pot, seamless pin pipe: 1231--7076
The maximum weight kg
Steel is A3; GB700-79.
Bolts are A3, GB5-76.
Nuts are A3, GB4176. bZxz.net
Pad drawing is 65Mn, GB93-76.
GB3802-83
The surface of steel ladders should be smooth, and there should be no skew, twist, deformation or other defects when assembled. The positive deviation of the weight of steel ladders should not exceed 5%, and there is no regulation for negative deviation. Steel ladders should be painted with anti-rust primer.
Steel ladders should be inspected and accepted by the technical inspection department of the manufacturer. Each ladder should have the following marks:
Manufacturer name or trademark;
Product model and standard number, such as: C400×3600 production batch number,
Inspection pass seal.
Additional instructions:
This standard was proposed by China State Shipbuilding Corporation. This standard is under the jurisdiction of the deck accessories professional group. This standard was drafted by Guangzhou Shipyard. The main drafter of this standard is Tang Su.
GB3892-—83;
From the date of implementation of this standard, the original standards CB73-75 "Straight Ladder" and CBM2004-81 "Straight Ladder" will be invalid. This standard refers to JISF2602-1978 "Steel Vertical Ladder". The main differences between it and ISO3797-76 and JISF2602-78 are: the ladder length of this standard is 0.6~6m, ISO3797-76 and JISF2602-78 are unlimited, the ladder width of this standard is 300, 350, 400mm (same as ISO3797--76), but the ladder width of JISF2602-78 is 250, 300, 350mm; there are also slight differences in materials. 77
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