TB/T 2626-1995 English PDF (TBT2626-1995)

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TB/T 2626-1995: Technical specification for rubber subplate under railway concrete track
TB/T 2626-1995
TB
RAILWAY INDUSTRY STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
Technical specification for rubber subplate under railway
concrete track
ISSUED ON: MARCH 10, 1995
IMPLEMENTED ON: SEPTEMBER 01, 1995
Issued by: Ministry of Railways of the People's Republic of China
Table of Contents
1 Subject content and scope of application ... 3
2 Normative references ... 3
3 Product type and marking ... 3
4 Technical requirements ... 4
5 Test methods ... 6
6 Acceptance rules ... 6
7 Marks, packaging, storage and transportation ... 7
Annex A (Normative) Test method for constant compression permanent deformation 9
Annex B (Normative) Test method for subplate working resistance ... 11
Annex C (normative) Test method for subplate static stiffness ... 12
Additional information: ... 14
Amendment No.1 of TB/T 2626-1995 Technical specification for rubber subplate under
railway concrete track ... 15
Technical specification for rubber subplate under railway
concrete track
1 Subject content and scope of application
This Standard specifies product types, technical requirements, test methods, acceptance
rules, marks, packaging, storage and transportation for elastic rubber subplates used for
cushioning between steel rails and concrete tracks (including wide tracks and integral
roadbeds) (hereinafter referred to as subplates).
This Standard applies to subplates used in the ambient temperature range of -50~70°C.
2 Normative references
GB 528, Rubber, vulcanized or thermoplastic - Determination of tensile stress-strain
properties
GB 531, Rubber, Vulcanized - The test method for the determination of shore A
hardness
GB 1682, Method of test for temperature limit of brittleness for vulcanized rubbers
GB 1689, Rubber, vulcanized - Determination of abrasion resistance (Akron
machine)
GB 3512, Rubber, vulcanized or thermoplastic - Accelerated ageing and heat
resistance tests - Air-oven method
GB 2828, Sampling procedures and tables for lot-by-lot inspection by attributes
(apply to inspection of successive lots or batches)
3 Product type and marking
3.1 Classification and mark characterized by rail type (see Table 1)
6.2.3 The inspection level of the appearance quality of subplate is the general inspection
level I. The acceptable quality level is 6.5.
6.2.4 The physical and mechanical performance inspection level of subplate is special
inspection level S-1. The acceptable quality level is 2.5.
6.2.5 The static stiffness inspection level of subplate is special inspection level S-1. The
acceptable quality level is 2.5.
6.2.6 Prepare specimens from semi-finished compounds for Akron abrasion test. The
abrasion must be less than 0.6cm3/1.61km. Otherwise it cannot be launched into
production.
6.2.7 If there are any failed items in the above inspection, in the failed batch of products,
the secondary sampling will be carried out with the same plan. Repeat the test for the
failed item. If the retest still fails, this batch shall be rejected. Unless the item can be
100% inspected. Resubmit after inspection.
7 Marks, packaging, storage and transportation
7.1 Marks
There must be clear marks that cannot be washed off by oil and water on the marked
parts specified in the product drawings. It must indicate:
1) Product name;
2) Year of manufacture (take the last two digits);
3) Name or logo of manufacturer.
7.2 Packaging
Subplates are packed in woven bags or cartons. Each package shall not exceed 50kg.
The surface of the packaging must be printed with:
1) Product name;
2) Product type;
3) Product quantity;
4) Manufacturer's name and trademark.
The product quality inspection certificate must be attached to the package. On the
certificate, it must indicate:
1) Product name and type;
The width of the loading short rail shall be 1mm larger than the width of the basic size
of the specimen. The length is the same as the specimen length. The width of the bottom
plate is the same as the length of the rail bottom, which is 170mm. Both sides of the
upper surface of the rail bottom must be planed. Add a glass sheet at the contact with
the dial gauge probe. The two dial indicators are supported on the base of the testing
machine. The probes of the two dial indicators are symmetrically arranged on the
opposite corners on both sides of the short rail.
C3 Test steps
The test environment temperature is 20±5°C.
Place the prepared specimen on the bottom plate as shown in Figure C. Apply 140kN
of static load. Unload. Stop for 10s. Reapply 140kN of load. Unload; then carry out the
formal test.
At the beginning of the formal test, adjust the two dial indicators to point to zero. Then
load it evenly at a speed of 2~3kN per second. When the load is increased to 20kN and
80kN, stop for 1min each. Record the compression amount ΔAi and ΔBi of the subplate
respectively (ΔAi and ΔBi are the average of the readings of the two dial gauges).
Repeat the test this way 3 times. The average value of ΔAi and ΔBi measured 3 times
is the average compression amount ΔA and ΔB of the subplate at 20kN and 80kN.
C4 Test result and test report
C4.1 Test result
The static stiffness value of the subplate is calculated according to the following
formula:
Where,
S0 - Static stiffness of the subplate, kN/mm;
ΔA - Compression amount of the subplate when loaded with 20kN, mm;
ΔB - Compression amount of the subplate when loaded with 80kN, mm;
60 - Static load, kN.
C4.2 Test report
The test report contains the following:
1) Specimen source, specification, quantity and manufacturer;