胶合板木托承重国标商务英语考试报名时间
1. Scope
This standard specifies the classification, technical requirements, inspection and testing methods, and marking of the plywood jack for bearing heavy loads.
2. Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only dated versions apply to this article. For undated references, the latest version (including all amendments) applies to this document.
burnt GB/T 1503.1 Method of Determination of the Structural Performance of Plywood — Part 1: Surface Strength
GB/T 1503.2 Method of Determination of the Structural Performance of Plywood — Part 2: Perpendicular Shear
汉堡包的英文 GB/T 1503.3 Method of Determination of the Structural Performance of Plywood — Part 3: Interlaminar Shear
GB/T 1503.4 Method of Determination of the Structural Performance of Plywood — Part 4: Bending
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GB/T 17657 Plywood — Requirements and Laboratory Test Methods
3. Terms and definitions
For the purpo of this document, the following terms and definitions apply.
3.1
Plywood jack for bearing heavy load
Plywood chassis ud to transport or bear heavy loads.
3.2
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Applied pressure
The largest pressure under which the plywood jack for bearing heavy load is expected to perform during the rvice life.
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Stability coefficient
K is the ratio of the actual bearing capacity of the plywood jack for bearing heavy load to the applied pressure.
3.4
Deformation allowance
The maximum allowable deformation of the plywood jack for bearing heavy load, calculated as the difference between the level of the upper surface of the plywood jack for bearing heavy load before loading and the level of the upper surface of the plywood ja
ck for bearing heavy load after loading.
4. Classification
Plywood jacks for bearing heavy loads are divided into A, B, C and D according to the applied pressure.
Table 1 — Classification of plywood jacks for bearing heavy loads
Class Applied pressure (MPa) Stability coefficient (K) Deformation allowance (mm)
A 0.2~0.25 ≥1.00 ≤2.8
B 0.3~0.35 ≥1.00 ≤2.3
C 0.4~0.50 ≥1.00 ≤1.7
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D 0.6~0.70 ≥1.00 ≤1.4。
