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GB/T 37613-2019

Chinese Standard: '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 22,261
Date of Issue 2019-06-04
Date of Implementation 2020-05-01
Drafting Organization Shandong Tiandun Mining Equipment Co., Ltd., Liaoning CRRC Rail Transportation Equipment Co., Ltd., Guangdong Jianlang Hardware Products Co., Ltd., Beijing Rail Transit Construction Management Co., Ltd., Metallurgical Industry Information Standards Institute
Administrative Organization National Steel Standardization Technical Committee (SAC/TC 183)
Regulation (derived from) National Standard Announcement No.7 of 2019
Proposing organization China Iron and Steel Association
Issuing agency(ies) State Administration of Markets and China National Standardization Administration

GB/T 37613-2019
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 range 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. It should be measured with a universal tool microscope.
Measure its angle.
8.3 radians detection
The main arc of the embedded channel should be tested with a special arc (recommended template) detector and feeler gauge.
8.4 Material Testing
The material detection of the embedded channel shall comply with the provisions of GB/T 4336 and GB/T 228.1.
8.5 Torsion test
Place the pre-buried channel with a length of 1m on the platform (the anchor is facing upwards), and the end of the pre-buried channel is close to the platform. It is recommended to measure the embedded with a feeler.
The distance between the other ends of the channel and the platform is L1 and L2, respectively. The vernier caliper should be used to measure the channel width W.
The torsion angle is calculated according to formula (1).
θ=arctan[(L1-L2)/W] (1)
In the formula.
θ --- torsion angle in degrees (°);
L1, L2--- the distance between the edge and the platform, in millimeters (mm);
W --- channel width in millimeters (mm).
8.6 Static bearing capacity detection of pre-buried channels
8.6.1 Basic requirements
The static bearing capacity detection of the embedded channel can be divided into.
a) The static bearing capacity of the bare channel of the embedded channel is shown in Figure 10;
Figure 10 Schematic diagram of static bearing capacity loading of bare parts in pre-buried channels
b) The static bearing capacity of the pre-buried channel pre-buried in concrete, the concrete strength should not be lower than C30, see Figure 11.
Figure 11 Schematic diagram of static bearing capacity loading of pre-buried channels pre-buried in concrete
8.6.2 Static bearing capacity detection of bare parts in pre-embedded channels
The static bearing capacity of the bare channel of the embedded channel should be tested by universal material testing machine or other equipment. The accuracy of the instrument is not less than Class 1
degree. The test load shall be increased evenly and steadily, and there shall be no impact, which lasts for 10 s under 1.5 times FL, 1.5 times FJ and 1.5 times FH load, respectively.
Observe the plastic deformation of the pre-buried channel, continue to apply the load until the pre-embedded channel is destroyed, and detect the ultimate load of the pre-buried channel. In the FJ,
In the FH load test, the thickness of the applied load should be 8 mm to 10 mm.
8.6.3 Static bearing capacity test embedded in concrete
The test method and equipment should be tested with the static bearing capacity of the bare parts of the pre-buried channel.
8.7 Fatigue performance testing
8.7.1 Fatigue test of bare parts of embedded channel
Connect the pre-buried channel with single anchor rod and T-bolt, and install it on the fatigue testing machine through the fixture, bolt and T-bolt
The center line is aligned and the fatigue test should be performed as follows.
a) fatigue test load position. load according to the FL position of Figure 10;
b) fatigue alternating waveform. sine wave;
c) Tensile load detection after fatigue test. The measurement is carried out according to the static bearing capacity detection method of the pre-buried channel in 8.6.2.
8.7.2 Fatigue test embedded in concrete
The pre-embedded channel and the T-bolt prefabricated in the concrete test block are connected, and installed on the fatigue testing machine through the fixture, fatigue test
The test shall be carried out in accordance with the following requirements.
a) fatigue test load position. load according to the FL position of Figure 11;
b) fatigue alternating waveform. sine wave;
c) Tensile load detection after fatigue test. The measurement is carried out according to the static bearing capacity detection method of the pre-buried channel in 8.6.3.
8.8 T-bolt standard tightening torque test
The standard tightening torque test shall be carried out in accordance with TB/T 2074.
8.9 Test of the performance of the embedded channel coating
8.9.1 Coating thickness detection
The thickness of the coating should be measured by a coating thickness gauge. When the thickness of the coating is measured by magnetic method, the measurement method should be in accordance with GB/T 4956.
Regulations are enforced.
8.9.2 Salt spray test
The salt spray test shall be carried out in accordance with the provisions of GB/T 10125, and the rating shall be carried out in accordance with the provisions of GB/T 6461.
8.10 Fire test test
The pre-buried channel of suitable length is intercepted, and the pre-buried channel is pre-buried in concrete with a thickness of 300 mm.
Practical application engineering design, concrete strength should not be lower than C30, should be tested according to GB/T 9978.1 or GB/T 26784 standard,
During the test, the direction of the fired embedded channel is single-sided fire. The schematic diagram of the fire test loading is shown in Figure 12.
Figure 12 Schematic diagram of fire test loading
8.11 Anti-loose test test
Pre-buried channels, T-bolts and related fasteners shall be in accordance with GJB150.16A.
8.12 Inspection rules
8.12.1 Inspections can be divided into type inspection and factory inspection. The rules and methods of type inspection and factory inspection should meet the requirements of Table 13.
Table 13 Rules and methods for type inspection and factory inspection
Serial number test item
technology
Claim
Inspection type
Type inspection
Test item
Factory inspection
Test item
Quantity unit test method
1 Visual inspection 7.1 √ √ 5 pieces 8.1
2 Dimensional inspection 4.2, Table 7 √ √ 5 pieces 8.1, 8.2, 8.3
3 Material inspection 5.1.1 √ √ 2 pieces 8.4
4 thickness of anti-corrosion layer 6.1.3 √ √ 5 pieces 8.9.1
5 torsion measurement 6.2 √ √ 2 pieces 8.5
Quiet
Load capacity
Static bearing capacity test of bare parts 7.2.1 √ √ 2 pieces 8.6
Pre-buried in concrete
Static bearing capacity detection
7.2.1 √ √ 2 pieces 8.6
8 Standard tightening torque test 7.2.3 √ √ 2 pieces 8.8
9 fatigue test 7.2.2 √ - 1 piece 8.7.1
10 Fatigue test embedded in concrete 7.2.2 √ - 1 piece 8.7.2
11 Pre-buried channel salt spray test 7.3.2 √ - 1 piece 8.9.2
12 T-bolt salt spray test 7.3.3 √ - 1 piece 8.9.2
13 Fire performance test 7.4 √ - 1 piece 8.10
14 Anti-loose performance test 7.5 √ - 1 item 8.11
8.12.2 Factory inspection
The pre-buried channel and supporting parts shall be inspected according to the corresponding product standards. When the supplier first supplies, the first two inspections shall be 15000m.
Control, follow-up inspection should be based on 30000m as an inspection batch, less than 30,000m according to a batch of inspection, after inspection, can confirm the use,
The inspection items are the factory inspection items in Table 13.
8.12.3 Type inspection
Type inspection should be carried out in one of the following cases.
a) new product stereotypes;
b) After the formal production of the embedded channel manufacturer, if there are major changes in structure, materials, processes, etc., which may affect product performance;
c) when the manufacturer of the pre-buried channel resumes production after more than one year of production stoppage;
d) When the factory inspection result is significantly different from the previous type inspection;
e) every 3 years of continuous production;
f) The manufacturer of the pre-buried channel is in the initial supply.
8.12.4 Re-inspection
When the test item fails, double the sample for re-inspection. If any of the retest results are unqualified, it is determined that the batch is unqualified. but
Allowed for branch-by-branch inspection, qualified delivery.
9 Marking, packaging, transportation and storage
9.1 Marking, packaging
9.1.1 The packaging tape and the pre-buried channel should be in close contact.
9.1.2 The packaging and marking of the pre-buried channel shall be carried out in accordance with GB/T 2101, and the pre-embedded channel shall be bundled after packaging.
9.1.3 The packaging and marking of fasteners such as T-bolts shall be carried out in accordance with the provisions of GB/T 90.2.
9.1.4 The packing box shall be accompanied by the product mark, certificate of conformity, factory inspection report and packing list.
9.1.5 The pre-buried channel packaging shall be made of special packaging frame, and shall be partitioned, layered and layered, and partitioned between each layer.
support.
9.2 Transportation
In the course of transportation, effective protective measures should be taken to prevent rain and acid, alkali and organic solvents from corroding substances;
It should be placed flat, firmly fixed, and must not damage the geometry of the product, and should not scratch the outer surface of the product. Protective measures should be taken during loading and unloading
Damage is caused. When unloading, forklifts should be used for unloading and unloading; when using cranes to unload, the lifting points should not be placed on the pre-buried channels.
9.3 Storage
9.3.1 The product should be stored in a ventilated and dry warehouse away from corrosive substances such as acids, alkalis and organic solvents.
9.3.2 If it is stored in an open space, there should be sun and rain protection measures.
Related standard:   GB/T 37622-2019  GB/T 26075-2019
Related PDF sample:   GB/T 37622-2019  GB/T 37430-2019
   
 
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