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GB/T 37613-2019: Embedded channel steel
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Embedded channel steel
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GB/T 37613-2019
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Basic data | Standard ID | GB/T 37613-2019 (GB/T37613-2019) | | Description (Translated English) | Embedded channel steel | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | H44 | | Classification of International Standard | 77.140.70 | | Word Count Estimation | 22,272 | | Date of Issue | 2019-06-04 | | Date of Implementation | 2020-05-01 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 37613-2019: Embedded channel steel---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Embedded channel steel
ICS 77.140.70
H44
National Standards of People's Republic of China
Pre-buried channel steel
Published on.2019-06-04
2020-05-01 implementation
State market supervision and administration
China National Standardization Administration issued
Content
Foreword I
1 Scope 1
2 Normative references 1
3 Terms and Definitions 1
4 Product Model 2
5 material 10
6 Processing and manufacturing requirements 11
7 Product Quality Requirements 12
8 Detection rules and detection methods 14
9 Marking, packaging, transport and storage 18
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This standard was proposed by the China Iron and Steel Association.
This standard is under the jurisdiction of the National Steel Standardization Technical Committee (SAC/TC183).
This standard was drafted. Shandong Tiandun Mining Equipment Co., Ltd., Liaoning CRRC Rail Transportation Equipment Co., Ltd., Guangdong Jianlang Hardware System
Product Co., Ltd., Beijing Rail Transit Construction Management Co., Ltd., Metallurgical Industry Information Standards Institute.
The main drafters of this standard. Guo Feng, Yan Guangli, Luo Guangzheng, Shen Wenzhou, Luo Furong, Liu Ge, Fang Xintao, Yuan Lidong, Xu Ling, Wang Yuxi,
Wu Chengyi, Huang Qiwu, Wang Rongtao.
Pre-buried channel steel
1 Scope
This standard specifies the terms and definitions of pre-buried channel steel, product model, material, processing and manufacturing requirements, product quality requirements, and inspection regulations.
And testing methods as well as marking, packaging, transportation, storage requirements.
This standard is applicable to pre-buried channel steels used in infrastructure projects such as rail transit and urban integrated pipe corridors (hereinafter referred to as “pre-buried tanks”.
Road").
2 Normative references
The following documents are indispensable for the application of this document. For dated references, only dated versions apply to this article.
Pieces. For undated references, the latest edition (including all amendments) applies to this document.
GB/T 90.2 Fastener Marking and Packaging
GB/T 97.1 flat washer A grade
GB/T 197 ordinary thread tolerance
GB/T 228.1 tensile testing of metallic materials - Part 1
GB/T 1591-2008 low alloy high strength structural steel
General provisions for GB/T 2101 steel acceptance, packaging, marking and quality certificates
GB/T 3098.1 Fastener mechanical properties bolts, screws and studs
GB/T 3098.2 fastener mechanical properties nut
GB/T 3103.1 Fastener Tolerance Bolts, Screws, Studs and Nuts
GB/T 3103.3 fastener tolerance flat washer
GB/T 4336 Determination of multi-element content of carbon steel and medium-low alloy steels by spark discharge atomic emission spectrometry (conventional method)
GB/T 4956 magnetic substrate on non-magnetic covering layer thickness measurement magnetic method
GB/T 6461 Metal and other inorganic coatings on metal substrates after corrosion test samples and test pieces
GB/T 9978.1 Fire resistance test methods for building components - Part 1. General requirements
GB/T 10125 artificial atmosphere corrosion test salt spray test
Technical requirements and test methods for hot-dip galvanized coating of GB/T 13912 metal-clad steel parts
GB/T 26110 zinc-aluminum coating technical conditions
GB/T 26784 Building component fire test optional and additional test procedures
GB 50016 Building Design Fire Code
GJB150.16A Environmental testing methods for military equipment - Part 16. Vibration test
JB/T 9186 carbon dioxide gas shielded welding process specification
TB/T 2074 electrified railway contact net parts test method
Technical conditions for multi-alloy co-seepage and anti-corrosion of TB/T 3274 railway concrete beam fittings
3 Terms and definitions
The following terms and definitions apply to this document.
3.1
Embedded channel
Composed of a C-shaped channel produced by a hot-roll forming process and a bolt placed on the back of the channel, pre-buried in precast concrete members or
In cast-in-place concrete, it is used to carry special parts for stress.
3.2
Anchor anchor
On the main body of the pre-buried channel, the welded or riveted extension is used to effectively solidify the pre-buried channel and concrete and transmit external force to the coagulation.
An anchor for the earth.
3.3
T-bolt T-bolt
Used in conjunction with pre-buried channels, it is used to fix connecting bolts for various types of pipelines and equipment hangers.
3.4
Twist twist
Torsional deformation generated along the length of the pre-buried channel during the processing of the embedded channel.
3.5
Tensile capacity
FL
The maximum tensile working capacity of a single bolt along the axis of the T-bolt to the pre-buried channel.
3.6
Shear capacity
FJ
At the same time perpendicular to the T-bolt and the length of the pre-buried channel (and no force arm state for the channel), a single bolt is generated for the pre-buried channel
Maximum shear work capacity.
3.7
Sliding bearing capacity
FH
The allowable bearing capacity of a single bolt along the length of the pre-buried channel (and no force arm state for the channel).
4 Product model
4.1 Model representation
4.1.1 Pre-buried channel model
4.1.1.1 Method for marking the embedded channel type
According to the channel steel section and the shape of the bolt, the type of the pre-buried channel should be expressed in the following form.
Embedded channel
Channel steel foot code (A. plane has teeth, B. swallow tail has teeth)
Anchor shape code (G. anchor is I-shaped, Y. anchor is cylindrical)
The width of the channel steel section b (mm)
×□
The height of the channel steel section h (mm)
Length of inner arc of embedded channel (mm)
The diameter of the arc in the embedded channel (mm), straight as Z
4.1.1.2 Example of embedded channel type marking
The model number of the embedded channel should include the code of this standard, the type of channel steel, the shape of the bolt, the section width of the channel steel, the section height of the channel steel,
The length of the inner arc of the embedded channel and the diameter of the arc in the pre-buried channel are expressed as follows.
GB/T 37613-CAG-30×20-3212-5400
Description.
CAG---the rolling plane has teeth, and the anchor rod is an I-shaped pre-buried channel;
30 --- channel steel section width 30mm;
20 --- channel steel section height 20mm;
3212---The inner arc length of the pre-buried channel is 3212mm;
5400---The diameter of the inner arc of the pre-buried channel is 5400mm.
4.1.2 T-bolt
4.1.2.1 T-bolt marking method
The T-bolts used in the pre-buried channels shall be expressed in the following forms according to the specifications.
LS□
The pre-buried channel is equipped with a T-bolt foot code (A. the plane has teeth, B. the dovetail has teeth)
-M□
Bolt nominal diameter (mm)
×□
T-bolt effective length (excluding end thickness mm)
Bolt performance rating
4.1.2.2 T-bolt marking example
T-bolt type designation should include bolt type, bolt nominal diameter, effective length, bolt performance grade, etc., as shown in the following example.
LSA-M12×60-8.8
Description.
LSA---planar toothed T-bolt;
M12---bolt nominal diameter 12mm;
60 --- bolt effective length 60mm;
8.8 --- Bolt performance rating 8.8.
4.2 Model Requirements
4.2.1 Flat tooth channel steel
4.2.1.1 Schematic diagram of flat-toothed channel steel is shown in Figure 1.
Description.
b --- channel steel width;
H1 --- channel steel groove thickness;
d --- channel steel wall thickness;
H2 --- channel steel tooth height;
R1 --- the inner arc radius of the channel steel cavity;
β --- channel steel tooth angle;
h---channel steel height;
B1---channel steel slot width;
B2---channel steel pitch;
r---the outer arc radius of the channel steel cavity;
----channel steel foot angle.
Figure 1 Schematic diagram of flat-toothed channel steel
4.2.1.2 The main dimensions, angles and tolerances of flat-toothed channel steels are to comply with the requirements of Table 1.
Table 1 Main Dimensions, Angles and Allowable Deviation Table of Flat Tooth Channel Steel
Series model
Size/mm angle
Bh h1 b1 d b2 h2 α β
30 series
30×20 30±1 20±1 5.5±0.5 14±1 3.0±0.4 3.0±0.2 1.5 0.3-0.2 90°±2° 60°±1°
30×26 30±1 26±1 5.5±0.5 14±1 3.0±0.4 3.0±0.2 1.5 0.3-0.2 90°±2° 60°±1°
40 series
38×23 38±1 23±1 6.0±0.5 18±1 3.5±0.4 3.0±0.2 1.5 0.3-0.2 90°±2° 60°±1°
39×23 39±1 23±1 6.0±0.5 19±1 3.5±0.4 3.0±0.2 1.5 0.3-0.2 90°±2° 60°±1°
40×22 40±1 22±1 6.0±0.5 19±1 3.5±0.4 3.0±0.2 1.5 0.3-0.2 90°±2° 60°±1°
50 series 50×26 50±1 26±1 8.0±0.5 21±1 4.5±0.5 3.0±0.2 1.5 0.3-0.2 90°±2° 60°±1°
4.2.2 Dovetail groove channel steel
4.2.2.1 Schematic diagram of the dovetail channel steel is shown in Figure 2.
Description.
b --- channel steel width;
H1 --- channel steel groove thickness;
d --- channel steel wall thickness;
H2 --- channel steel tooth height;
R1 --- the inner arc radius of the channel steel cavity;
β --- channel steel tooth angle;
h --- channel steel height;
B1 --- channel steel slot width;
B2 --- channel steel pitch;
r --- the outer arc radius of the channel steel cavity;
α --- Channel steel foot angle.
Figure 2 Schematic diagram of the dovetail channel steel
4.2.2.2 The main dimensions, angles and allowable deviations of the dovetail channel steel shall comply with the requirements of Table 2.
Table 2 Main Dimensions, Angles and Allowable Deviation Table of Dovetail Channel Steel
Series model
Size/mm angle
Bh h1 b1 d b2 h2 α β
30 series
30×20
30±1 20±1 5.5±0.5 14±1 3.0±0.4 3.0±0.2 1.5 0.3-0.2 70°±2° 60°±1°
30±1 20±1 5.5±0.5 14±1 3.0±0.4 3.5±0.2 1.5 0.3-0.2 70°±2° 80°±1°
30×26
30±1 26±1 5.5±0.5 14±1 3.0±0.4 3.0±0.2 1.5 0.3-0.2 70°±2° 60°±1°
30±1 26±1 5.5±0.5 14±1 3.0±0.4 3.5±0.2 1.5 0.3-0.2 70°±2° 80°±1°
40 series
38×23
38±1 23±1 6.0±0.5 18±1 3.5±0.4 3.0±0.2 1.5 0.3-0.2 70°±2° 60°±1°
38±1 23±1 6.0±0.5 18±1 3.5±0.4 3.5±0.2 1.5 0.3-0.2 70°±2° 80°±1°
39×23
39±1 23±1 6.0±0.5 19±1 3.5±0.4 3.0±0.2 1.5 0.3-0.2 70°±2° 60°±1°
39±1 23±1 6.0±0.5 19±1 3.5±0.4 3.5±0.2 1.5 0.3-0.2 70°±2° 80°±1°
40×22
40±1 22±1 6.0±0.5 19±1 3.5±0.4 3.0±0.2 1.5 0.3-0.2 70°±2° 60°±1°
40±1 22±1 6.0±0.5 19±1 3.5±0.4 3.5±0.2 1.5 0.3-0.2 70°±2° 80°±1°
50 series 50×26 50±1 26±1 8±0.5 21±1 4.5±0.5 3±0.2 1.5 0.3-0.2 70°±2° 60°±1°
4.2.3 Anchor
4.2.3.1 Cylindrical anchor
A schematic diagram of the cylindrical anchor is shown in Figure 3. The main dimensions of cylindrical anchors are to comply with Table 3.
Description.
D --- cylindrical anchor diameter;
D1 --- the diameter of the outer end of the cylindrical bolt;
l --- cylindrical anchor height;
h --- Cylindrical anchor anchor end cap height.
Figure 3 Schematic diagram of cylindrical anchor
Table 3 The main dimensions of cylindrical anchors are in millimeters
series
size
D l D1 h
30 series 8~10 60~80 14~18 1.5~2.5
40 series 10~12 70~100 20~26 1.5~2.5
50 series 12~14 100~120 24~28
2.0~3.0
4.2.3.2 I-shaped anchor
The schematic diagram of the I-shaped anchor is shown in Figure 4. The main dimensions of the I-shaped anchors are to comply with the requirements of Table 4.
Description.
D--- I-shaped anchor waist thickness;
l---I-shaped anchor length;
h---I-shaped anchor height;
b--- I-shaped anchor leg width.
Figure 4 Schematic diagram of the I-shaped anchor
Table 4 The main dimensions of the I-shaped anchor are in millimeters.
model
size
Dhlb
30 series 6±1.0 ≥80 14~22 18±1.5
40 series 6±1.0 ≥100 20~28 18±1.5
50 series 6±1.0 ≥120 30~40 25±2.0
4.2.4 T-bolt
4.2.4.1 General requirements
For the embedded channel, the T-bolt should be equipped with two pieces of hex nut, two-disc lock washer and flat washer.
4.2.4.2 Flat tooth type T bolt
A schematic diagram of the flat-tooth T-bolt and related accessories is shown in Figure 5. The main dimensions and angles of the flat-tooth T-bolt shall comply with Table 5.
Provisions.
a) Flat tooth type T bolt
b) Hex nut c) Flat washer d) Two-disc lock washer
Description.
l --- T bolt effective length;
M --- T bolt outer diameter;
h ---T bolt height;
β ---T bolt tooth angle;
b ---T bolt pitch;
α ---T bolt foot angle;
γ --- T bolt head angle.
Figure 5 Schematic diagram of flat-toothed T-bolts and related accessories
Table 5 Main shape and angle of flat-tooth T-bolt
model
Size/mm angle
Lbh α β γ
M12 40~160 3.0±0.2 1.2 0-0.2 90°±2° 60°±1° 45°~90°
M14 40~160 3.0±0.2 1.2 0-0.2 90°±2° 60°±1° 45°~90°
M16 40~160 3.0±0.2 1.2 0-0.2 90°±2° 60°±1° 45°~90°
M20 40~160 3.0±0.2 1.2 0-0.2 90°±2° 60°±1° 45°~90°
4.2.4.3 Dovetail T-bolt
A schematic diagram of the dovetail T-bolt and related accessories is shown in Figure 6. The main dimensions and angle of the dovetail T-bolt should be consistent with
The provisions of Table 6.
a) Dovetail T-bolt
b) hex nut
c) flat washer
d) Two-disc lock washer
Description.
l --- T bolt effective length;
M---T bolt outer diameter;
h ---T bolt height;
β ---T bolt tooth angle;
b ---T bolt pitch;
α ---T bolt foot angle;
γ --- T bolt head angle.
Figure 6 Schematic diagram of the dovetail type T-bolt and related accessories
Table 6 Main shape and angle of dovetail T-bolt
model
Size/mm angle
Lbh α β γ
M12
40~160 3.0±0.2 1.2 0-0.2 70°±2° 60°±1°
40~160 3.5±0.2 1.2 0-0.2 70°±2° 80°±1°
45°~90°
M14
40~160 3.0±0.2 1.2 0-0.2 70°±2° 60°±1°
40~160 3.5±0.2 1.2 0-0.2 70°±2° 80°±1°
45°~90°
M16
40~160 3.0±0.2 1.2 0-0.2 70°±2° 60°±1°
40~160 3.5±0.2 1.2 0-0.2 70°±2° 80°±1°
45°~90°
M20 40~160 3.0±0.2 1.2 0-0.2 70°±2° 60°±1° 45°~90°
5 materials
5.1 Pre-buried channel material
5.1.1 The material of the pre-buried channel shall meet the following requirements.
a) Both the channel steel and the anchor material should be uniform;
b) boiling steel shall not be used;
c) The mechanical properties should not be lower than the provisions of Q345B in GB/T 1591-2008, but the elongation after fracture can be not less than 14%;
d) the carbon content should not exceed 0.20%;
e) The carbon equivalent should not exceed 0.44%.
5.1.2 The selection of raw materials shall comply with the material requirements specified in the design documents and shall comply with the technical requirements of the relevant material standards.
5.2 T-bolts and accessories
5.2.1 The performance level of the T-bolt used with the pre-buried channel shall not be less than 8.8, and the performance level of the nut matched with the T-bolt shall not be low.
At level 8.
5.2.2 The mechanical properties of all fasteners such as T-bolts, nuts and washers shall comply with GB/T 3098.1, GB/T 3098.2 and GB/T 97.1.
It is stipulated that the T-bolt should be well connected with the pre-buried channel, and the tooth shape should be the same.
5.2.3 T-bolt and nut tolerances shall comply with the provisions of GB/T 3103.1, thread tolerances shall comply with the provisions of GB/T 197, gasket tolerances
Should comply with the provisions of GB/T 3103.3.
5.2.4 The embedded channel and the T-bolt connection shall have anti-loose measures to ensure the firmness in the use environment.
5.3 Pre-buried channel filling
The interior of the pre-buried channel should be densely filled, the filling requirements should be uniform, full, and the shape should be regular. It should avoid the leakage during construction. Filling material should be selected
Use safe and environmentally friendly materials and remove them when installing equipment in the tunnel. The specific dimensions should match the size of the pre-buried channel selected. Filler
The cross section of the material is shown in Figure 7.
Figure 7 Schematic diagram of the filling material
5.4 Packaging Tape
Adhesive tape shall be placed at the slot of the embedded channel to prevent concrete mortar from penetrating into the slot during construction.
6 Processing and manufacturing requirements
6.1 Processing technology
6.1.1 The production and processing technology of the pre-buried channel shall meet the following requirements.
a) Channel steel shall be manufactured by hot rolling and heating bending one-shot molding process;
b) The production and processing of the pre-buried channel shall be carried out at the factory;
c) The channel steel for the pre-buried channel shall ensure that the finished product is processed from a section steel.
6.1.2 The finished channel and the T-bolt finished product shall not be subjected to other treatments such as cutting.
6.1.3 The surface of the pre-buried channel should adopt the multi-alloy co-permeation sealing layer anti-corrosion process or the hot dip galvanizing anti-corrosion process.
When infiltration, it should meet the requirements of TB/T 3274, the thickness of the anti-corrosion layer should not be less than 80μm; when hot dip galvanizing, it should comply with GB/T 13912
It is stipulated that the thickness of hot dip galvanizing should not be less than 70μm.
6.1.4 T-bolts for use with pre-buried channels and nuts and washers for T-bolts should be multi-alloy co-impregnated or zinc-aluminum coated.
Such as anti-corrosion technology treatment, when using multi-alloy co-infiltration, should comply with the provisions of TB/T 3274, the thickness of the anti-corrosion layer should not be less than 25μm;
When using zinc-aluminum coating, it should meet the requirements of GB/T 26110, and the thickness of the anti-corrosion layer should not be less than 20μm.
6.1.5 The connection between the channel steel and the anchor rod shall be hot riveted or double-sided welded. The welding of channel steel and anchor should be carried out according to the welding process requirements.
Corresponding to the special tooling, side bends, torsion and thermal deformation should not occur, and the stress should be removed after welding. Use carbon dioxide or argon
Protective welding shall comply with the provisions of JB/T 9186.
6.2 Pre-buried channel dimensions and tolerances
6.2.1 When cylindrical anchors are used, the dimensions of the pre-buried channels are shown in Figure 8. The dimensions and tolerances are to comply with the requirements of Tables 7 and 8.
The unit is mm
Note. R is the radius of curvature and L is the length of the channel.
Figure 8 Schematic diagram of the dimensions of the pre-buried channel
Table 7 Pre-buried channel dimensions and tolerances
Anchor and channel steel connection length tolerance
Radius tolerance
(In the absence of external force, the groove notch surface is
Radius detector template face maximum distance)
Twist
Hot riveting/double-sided welding L±5mm ≤10mm ≤1(°)/m
Table 8 Pre-buried channel anchor arrangement size
Bolt and channel steel connection method Anchor distance Spacing bolt and channel steel nearest end
Hot riveting/double-sided welding ≤ 2 times total height ≤ 50mm
6.2.2 When using the I-shaped anchor, the dimensions of the pre-buried channel are shown in Figure 9. The dimensions and tolerances are to comply with the requirements of Tables 7 and 8.
The unit is mm
Note. R is the radius of curvature and L is the length of the channel.
Figure 9 Schematic diagram of the size of the pre-buried channel
7 Product quality requirements
7.1 Surface quality
7.1.1 The surface of the embedded channel coating shall be smooth, clean and free of scratches.
7.1.2 There should be no cracks or spots on the surface of the pre-buried channel and T-bolt.
7.2 Mechanical properties requirements
7.2.1 Static bearing capacity requirements for pre-buried channels
The static bearing capacity of the embedded channel should meet the following requirements.
a) The static bearing capacity of the pre-buried channel shall comply with the requirements of Table 9, and shall be satisfied with the work of stretching (FL), shearing (FJ) and sliding (FH).
Requirements under conditions of bearing capacity.
Table 9 Static bearing capacity of pre-buried channel
model
FL
kN
FJ
kN
FH
kN
30 series 10 10 8
40 series 12 12 12
50 series 15 15 15
b) Under the action of 1.5 times tensile (FL) load, the pre-buried channel shall be free from plastic deformation.
c) Under the action of 1.5 times shear (FJ), the pre-buried channel should be free of plastic deformation.
d) Under the action of 1.5 times sliding (FH) load, the pre-buried channel should be free from plastic deformation.
e) The pre-buried channel shall be subjected to a failure load test. The tensile, shearing and sliding loads shall not be less than 3.0 times the FL, FJ and FH loads.
7.2.2 Pre-buried channel fatigue performance requirements
The fatigue test requirements for the pre-buried channel shall comply with the provisions of Table 10. After the fatigue test, the notch shall be deformed and the anchor shall be free from damage.
The tensile failure load after the fatigue test shall be not less than 2.85 times FL.
Table 10 fatigue test requirements
Embedded channel status
Fatigue frequency
Hz
Fatigue frequency
Reference value and amplitude
kN
Pre-buried channel bare parts 1~3 5×105 (1±0.3)FL
The pre-buried channel is pre-buried in concrete 1~3 2×106 (1±0.3) FL
7.2.3 T-bolt tightening torque
After the T-bolt is tested for tightening torque, the bolt and nut shall not be skewed, damaged or sedentated. The pre-tightening force of the bolt shall be pre-embedded.
The road shall not be damaged. The standard tightening torque value of the T-bolt shall comply with the requirements of Table 11.
Table 11 T-bolt standard tightening torque value
model
Standard tightening torque
N·m
M12 ≥80
M14 ≥85
M16 ≥100
M20 ≥110
7.3 Performance requirements for embedded channel coatings
7.3.1 Basic requirements
The outermost sealing coating of the pre-buried channel shall not react with the concrete.
7.3.2 Salt spray resistance performance requirements for pre-buried channels
A neutral salt spray test or a copper accelerated acetate spray test can be used.
When using the neutral salt spray test, the salt spray resistance of the pre-buried channel should meet the requirements of 2400h, and the rating should not be lower than 9.
When using copper accelerated acetate spray test, the salt spray resistance of the pre-buried channel should meet the requirements of 300h, and the rating should not be lower than
Level 9.
7.3.3 T-bolt resistance to salt spray performance requirements
A neutral salt spray test or a copper accelerated acetate spray test can be used.
When using the neutral salt spray test, the salt spray resistance of the T-bolt should meet the requirements of 1200h, and the rating should not be lower than 9.
When using copper accelerated acetate spray test, the salt spray resistance of T-bolt should meet the requirement of 150h, and the rating should not be lower than
Level 9.
7.3.4 Requirements for insulation performance of embedded channels
The anti-corrosion coating of the embedded channel can increase the insulation performance index according to the agreement between the supplier and the buyer.
7.4 Fire resistance requirements for pre-buried channels
Pre-buried channels, T-bolts and related fasteners shall meet the requirements of GB 50016 and shall be in accordance with GB/T 9978.1 or GB/T 26784.
It is stipulated to carry out the bearing fire test, and the fire bearing capacity should not be lost after the test. The requirements for fire resistance and load-bearing time shall be in accordance with Table 12.
Provisions.
Table 12 Refractory bearing capacity and bearing time requirements
model
GB/T 9978.1
(standard time-temperature curve)
GB/T 26784
(Standard temperature-time curve of tunnel fire RABT-ZTV heating conditions)
Bearing capacity
kN
time
Min
Bearing capacity
kN
time
Min
30 series 1.8 90 0.8 120
40 Series 2.0 90 1.0 120
50 series 3.0 90 1.5 120
Note. GB/T 9978.1 heating curve is applicable to the pre-buried channel used in the integrated pipe corridor project; the RABT-ZTV heating curve specified in GB/T 26784
Suitable for pre-buried channels used in rail transit engineering.
7.5 Anti-loose performance requirements
The pre-buried channel, T-bolt and related fasteners are tested for vibration according to the provisions of GJB150.16A, and the vibration frequency is 100Hz.
When the waveform is sinusoidal, the amplitude is 0.2mm and 3 million times, the fasteners such as nuts should not be loose.
8 Detection rules and detection methods
8.1 Appearance Dimensional Inspection
Visual inspection should be carried out for visual inspection; vernier calipers with an accuracy of 0.02 mm should be used for dimensional inspection, and meters should be used for length detection.
8.2 Angle detection
For angle detection, the pre-buried channel should be cut into 1mm thick thin slices along the vertical length with a wire cut. I...
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