Some standard content:
National Standard of the People's Republic of China
Packaging containers
Magnesium oxychloride concrete box
Packaging containers- Magnesium oxychloride concrete case
Subject content and scope of application
GB 1304191
This standard specifies the structural type, technical requirements, test methods, inspection rules, marking, storage, use and transportation of magnesium oxychloride concrete packaging boxes (hereinafter referred to as packaging boxes).
This standard is applicable to packaging boxes made of magnesium oxychloride concrete or composed of magnesium oxychloride concrete as the main component and components made of other materials. It can also be used as a reference for magnesium oxychloride concrete packaging components used alone. 2 Reference standards
GB4857.9 Basic tests for transport packaging
Spray test method
GB5398 Test method for large transport packaging 3 Structural type
Magnesium oxychloride concrete packaging boxes are composed of a base, a top cover, side faces, end faces and connecting parts, as shown in Figure 1. Refer to Appendix B (reference part) for the general structural type of the packaging box. Cover
3.1 Components
3.1.1 Base
The base type can generally be divided into two types: integral type and combined type, as shown in Figure 2a, b. 3.1.1.1
Approved by the State Administration of Technical Supervision in 1991-0626
Lifting guard iron
Connecting parts
Lifting guard iron
Implementation in 199204-01
a. Integral type
GB13041—91
b. Assembly type
According to the weight, width, center of gravity and fixed position of the contents, the slide can be arranged with two or more equal hooks or eccentrically. The ends of the slide should be provided with lifting grooves and roller guide angles. As shown in Figure 3a, b. 30 ~4
3.1.1.4 For packages that need to be transported by forklift, the slide can be equipped with fork grooves. Fork grooves for packages less than or equal to 5000kg: - General type is shown in Figure 4 and Table 1.
Package weight, kg
2001~5000
3.1.1.5 For packages with a weight greater than 5000kg, a lifting guard should be provided at the lifting point of the slide. The lifting guard should have sufficient strength, the corner radius r should not be less than 15mm, and should be firmly fixed on the component. As shown in Figure 5520
3.1.2 Top cover
GB 13041—91
历(（
Lifting guard iron
The top cover generally adopts a flat top,
It can also adopt a ridge top, a solitary top and a sloping top structure. As shown in Figure 6. E
Ridge top
The general structural type of the top cover is shown in Figure 7. When the width is large, one or more longitudinal supports can be set in the middle. 3.1.2.2
3.1.3 Side and end faces
3.1.3.1 The general types of side and end faces are shown in Figures 8a, b, c, d, c, f. The width and thickness of the frame edge and column should meet the requirements of reinforcement and connection. The joints between the frame edge and the column should be rounded or chamfered. 521
GB13041-91
3.1.3.2 When the packaging box is high or long, the side and end faces can be made into a spliced structure, as shown in Figure 9a, b. If necessary, bolts can be used to connect as shown in Figure 10a, b.
3.2 Packing box assembly
GB13041—91
3.2. 1 The connection method of the packaging box components is shown in Figure 11a, b, c, d, e, f, g. 523
GB1304191
Side (end) surface
Side (end) surface
3.2.2 It is allowed to use magnesia components as the base, while the top cover, side and end surfaces are made of other materials with reliable performance proven by tests. Regardless of the material used, the strength requirements of the packaging box must be ensured and it must meet the storage, transportation and loading and unloading requirements. 4 Technical requirements
4.1 In addition to meeting the requirements of this standard, packaging boxes must also be manufactured in accordance with packaging design drawings and technical documents approved through prescribed procedures, and must meet the requirements of science, economy, firmness, beauty, and applicability. 4.2 The raw materials used in magnesia concrete components shall comply with the provisions of Appendix A (Supplement). 4.3 The compressive strength of magnesia concrete test blocks shall be greater than 10MPa. 524
Upper cover (frame type)
(See Figure 13)
Frame edge thickness d
Frame edge width
GB 13041--91
Continued Table 3
Side, surface, top cover
Diagonal E
Reserved hole position
Lifting position!
Combined gap of closed box
Note: If there are special requirements, they should be specified in the design drawings. Figure 12
>1 500
>1 500
GB13041—91
4.6 When the base is composed of three or more slides, the middle slide shall not be higher than the two sides. And the middle of the bottom surface of the slide, the pad and the bottom bracket shall not protrude.
4.7 The strength and stiffness of the components shall meet the design requirements. 4.7.1
When the static load strength test of the bending member is loaded to the factory inspection load gs: the deflection value of the specimen is bzxZ.net
(L is the distance between the support points of the specimen, see Figure 18), the magnesia concrete in the compression zone is not crushed;
The specimen does not have cracks.
When the static load strength test of the bending member is loaded to the fixed test load qp: the deflection value of the specimen f<-
The width of the crack in the tensile zone of the specimen is less than 1.5mm, and the length does not exceed half of the height of the specimen; the magnesite concrete in the compression zone is not crushed,
The specimen does not have longitudinal cracks or oblique cracks;
The reinforcement is not broken.
4.8 After the packaging box is tested according to the specified items, there shall be no obvious damage, deformation or other defects in all parts of the components. During rolling transportation, the total peeling area of the bottom of the slide shall not exceed one-fourth of its bottom area, and the reinforcement shall not be exposed. After the spray test, the closed box shall not leak. When high-precision or electrical products are installed, there shall be no water seepage in the box. The records of hidden projects should be complete and correct.
5 Test method
Test method for compressive strength of magnesia concrete test block
The compressive strength of magnesia concrete test block can usually be used as the compressive strength of magnesia concrete components. 5.1.1 Test block preparation
During the production of components, three groups (three blocks in each group) of test blocks are made every day according to the same raw materials and the same proportion, and their strength is measured in stages, with one group tested each time.
5.1.2 A cubic magnesia concrete test block with a side length of 70.7mm is used for compressive strength test. The test is carried out using a material testing machine (no lubricant is added between the test block pressure plates), and the load is continuously and uniformly applied at a speed of 0.3 to 0.5MPa/s until it is destroyed. The compressive strength R of the test block is calculated according to formula (1): 527
Where: R-test block compressive strength, MPa;
P-destructive load value, N
A——test block pressure bearing area, mm\.
5.1.3 Calculation of bearing area
GB 13041--91
The test block size is measured accurately to 1mm, and the bearing area A of the test block is calculated accordingly. If the difference between the measured size and the nominal size does not exceed 1mm, it can be calculated according to the nominal size.
5.1.4 Principle of selecting test block data
The arithmetic mean of the compressive strength values of the three test blocks is taken as the compressive strength value of the test block group. If the difference between the maximum or minimum value of the three test values and the middle value exceeds 15%, the maximum and minimum values are discarded, and the middle value is taken as the compressive strength value of the test block group. If the difference between the two test values and the middle value exceeds 15%, the test results of this group are invalid. 5.1.5 The measurement time is determined according to the climate and maintenance conditions of each place. 5.2 Component strength test method
During the test, the load arrangement should comply with the design requirements, and it is allowed to convert the load according to the equivalent load principle. 5.2.1 Static strength test method for flexural members 5.2.1.1 Calculation of load values
a. Component factory inspection load qs is calculated according to formula (2): qs=K,×qb
where: qs Component factory inspection load, N; K
coefficient, take 1.5;
design rated load or equivalent load converted, N. b. Component type inspection load qp is calculated according to formula (3): qp=K2×qh
where: qp-
Component type inspection load, N;
-coefficient (according to the safety factor adopted in the design). 5.2.1.2 Support type
Use simple support. During the test, one end is supported by a hinge and the other end is supported by a rolling support. The support type of the base (or chassis) is divided into the following three types according to the force conditions (if the base is more than three slides, the support is still four points): Lifting type: The support point should be at the position of the hanging groove, as shown in Figure 14 (integral base) and Figure 15 (combined base). Figure 14
Simple transport type: as shown in Figure 16.
Rolling transport type: as shown in Figure 17.
5.2.1.3 Loading method and test record
GB 13041-91
a. Deflection measurement method: Use a dial indicator to measure; or use the wire method to measure deflection, as shown in Figure 18; Figure 18
1—steel nail, 2—shield, 3 steel, 4-shield: 5—pier, 6—angle steel 7 test member; 8—wire; 9—coordinate paper: 10—rubber band Loading method: Use heavy objects or other loading methods to load, and load in stages according to the following provisions: b.
The first stage is loaded to the design rated load (or equivalent load) 9b, constant load for 10min; the second stage is loaded to the factory inspection load (or equivalent load) 9s, constant load for 10min; the third stage is loaded to the type inspection load (or equivalent load) P. From the factory inspection load q. When loading to the type inspection load qp, each loading value should be 20% of the design rated load (or equivalent load) 9b, and load to the type inspection load 4p step by step, and the constant load time after each loading is not less than 10min.
If the component is only required to undergo factory inspection, the third level of loading will not be carried out, but after the second level of loading, the constant load time is 1h. After each level of loading, the crack conditions and deflection values of the component must be checked and recorded according to the requirements of Table 4. 529
Component model name
Design rated load
Record content
First level qh
Second level qs
Third level qm
Component size
Sliding wood section
Calculated maximum
Load value Loading time
Test block compressive strength, MPa
Component actual force diagram
Test conclusion:
5.3 Packaging box test
GB 13041—91
Magnesium concrete component inspection record
Length × width × height, mm
Width × Height, mm
h or minWidth × length
【Width × length
Tensile strength of bamboo and reinforcement, MP
Component inspection force diagram
Year Month Day
Length × width × height, nm
Width × height, m
When conducting the following tests, the actual contents should be used for testing, and simulations with weight, center of gravity, stress state and fixing method close to the actual contents can also be used for testing. 5.3.1 Lifting test
According to GB5398.
5.3.2 Side and end bearing test
According to GB5398.
5.3.3 Face and edge drop test
According to GB5398.
5.3.4 Forklift test
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