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JG/T 225-2020 English PDF

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US$349.00 · In stock
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JG/T 225-2020: Corrugated metal ducts for prestressed concrete
Status: Valid

JG/T 225: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
JG/T 225-2020	349	Add to Cart	3 days	Corrugated metal ducts for prestressed concrete	Valid
JG 225-2007	120	Add to Cart	Auto, < 3 mins	Corrugated metal dusts for prestressee concrete	Obsolete

Similar standards

JC/T 564.1 JC/T 746 JG/T 352 JGJ/T 221 JGJ/T 225

Basic data

Standard ID: JG/T 225-2020 (JG/T225-2020)
Description (Translated English): Corrugated metal ducts for prestressed concrete
Sector / Industry: Building & Construction Industry Standard (Recommended)
Classification of Chinese Standard: Q14
Classification of International Standard: 23.040.10
Word Count Estimation: 15,118
Date of Issue: 2020
Date of Implementation: 2020-08-01
Issuing agency(ies): Ministry of Housing and Urban-Rural Development of the People's Republic of China

JG/T 225-2020: Corrugated metal ducts for prestressed concrete

---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.
Corrugated metal ducts for prestressed concrete Replace JG/T 225-2007 The People's Republic of China Construction Industry Industry Standard Issued by the Ministry of Housing and Urban-Rural Development of the People's Republic of China Metal bellows for prestressed concrete

Foreword...II 1 Scope...1 2 Normative references...1 3 Classification and marking...1 4 Requirements...1 5 Test method...4 6 Inspection rules...7 7 Packaging and marking...8 8 Transport and storage...9 9 Use...9 Appendix A (Informative Appendix) Quality Inspection Record Form of Metal Bellows for Prestressed Concrete...10 Appendix B (informative appendix) Selection of metal bellows for prestressed concrete...11

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009. This standard is a revision of JG 225-2007 "Metal Bellows for Prestressed Concrete". Main technical content compared with JG 225-2007 The changes are as follows. -Cancel the classification by the number of ripples (3.1 in the.2007 version); -Modified the marking method (see 3.2, 3.2 of the.2007 edition); --- Added the structural diagram of the metal bellows (see 4.1.1 and 4.1.2); -Modified the specifications of the metal corrugated flat tube (see 4.4.2, 4.4.2 of the.2007 edition); -Modified the radial stiffness, modified to resist local lateral load performance and resist uniform load performance (see 4.5,.2007 edition 4.5); -Modified the meaning of symbols (see 4.5, 4.5 in.2007 edition); --Added the requirements for connecting pipes (see 4.7); --Improved the test method of anti-external load performance (see 5.3, 5.3 of the.2007 edition); -Modified the test method of anti-leakage performance after bending (see 5.4.2, 5.4.2 of the.2007 edition); -Modified the type inspection group batch regulations (see 6.3.2, 6.3.2 of the.2007 edition); - Modified the inspection result judgment rules (see 6.4,.2007 version 6.4); --- Added requirements for metal bellows connection (see 9.4); -Revised Appendix A and Appendix B. This standard was proposed by the Standard Rating Institute of the Ministry of Housing and Urban-Rural Development. This standard is under the jurisdiction of the Construction Engineering Quality Standardization Technical Committee of the Ministry of Housing and Urban-Rural Development. Drafting organizations of this standard. China Academy of Building Research Co., Ltd., Kaifeng Qiangli Group Anchor Technology Co., Ltd., Tianjin Zhong Anchor Prestress Co., Ltd., Beijing Institute of Construction Engineering Co., Ltd., National Construction Engineering Quality Supervision and Inspection Center, Anhui Jinxing Prestress Engineering Technology Co., Ltd., Liuzhou Qium Prestress Machinery Co., Ltd., Jiangsu Xinzhu Prestress Engineering Co., Ltd., Henan Hongqiao Windlass Co., Ltd., Zhemao Technology Co., Ltd., Liuzhou Ouweimu Machinery Co., Ltd., Tianjin Shengwen Prestressed Machinery Co., Ltd., China State Construction Technology Group Co., Ltd., Tianjin Zhenhua Prestress Technology Co., Ltd., China Construction Research (Beijing) Structural Engineering Co., Ltd., China Railway Electrification Bureau Group Beijing Construction Engineering Co., Ltd. The main drafters of this standard. Dai Weiming, Chen Qian, Li Jinling, Song Wei, Liu Hang, Cui Dekui, Chen Yiqiang, Mei Zhigan, Luan Wenbin, Geng Shuling, Zeng Li, Zuo Haining, Zhang Jinshun, Chen Yong, Liu Jianmin, Zhu Ying, Huo Deming. The previous editions of the standard replaced by this standard are as follows. Metal bellows for prestressed concrete

1 Scope

This standard specifies the classification and marking, requirements, test methods, inspection rules, packaging and marking of metal bellows for prestressed concrete. Transportation and storage, use, etc. This standard is applicable to galvanized or non-galvanized low carbon steel strips made of spirally folded bites, with a corrugated surface, used for post-tensioning prestressing Metal pipes with holes reserved in concrete structures or components.

2 Normative references

The following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this document. For undated references, the latest version (including all amendments) applies to this document. GB 716 Carbon structural steel cold rolled steel strip GB/T 2518 Continuous hot-dip galvanized steel sheet and steel strip

3 Classification and marking

3.1 Classification Products can be divided into standard type and enhanced type; according to the cross-sectional shape can be divided into round and flat. 3.2 Mark Product marking should consist of code, specification and category. Type of metal bellows, the standard pipe code is B, and the enhanced pipe code is Z Metal bellows specifications, round pipes are expressed in nominal inner diameter, flat pipes are expressed in nominal inner long axis × nominal inner short axis, and the unit is millimeter (mm) Metal bellows code. JBG Example 1. The standard round pipe with a nominal inner diameter of 70mm is marked as JBG-70B. Example 2. The reinforced round pipe with a nominal inner diameter of 70mm is marked as JBG-70Z. Example 3. The standard flat tube with a nominal inner long axis of 67mm and a nominal inner short axis of 20mm is marked as JBG-67×20B. Example 4. The reinforced flat tube with a nominal inner long axis of 67mm and a nominal inner short axis of 20mm is marked as. JBG-67×20Z.

4 requirements

4.1 Structure 4.1.1 The structure of the metal corrugated round pipe is shown in Figure 1. 4.1.2 The structure of the metal corrugated flat tube is shown in Figure 2. 4.1.3 The corrugated direction of the metal bellows should be right-handed. 4.1.4 The width △L of the overlapped part of the metal bellows folding bite shall not be less than 8 times the thickness t of the steel strip, and shall not be less than 2.5mm. fold The cross-sectional structure of the bite is shown in Figure 3. Unit is mm 4.1.5 The top and roots of the raised corrugations between the folding and biting parts of the metal bellows should be in a circular arc transition, and there should be no corners. 4.2 Materials 4.2.1 The steel strip for making metal bellows should be galvanized or non-galvanized low carbon steel strip. When using galvanized steel strip, the performance should comply with GB/T 2518 When using non-galvanized steel strip, the performance should meet the requirements of GB 716; other metal materials that have been proven applicable can also be used. steel The belt should be accompanied by a product certificate or quality guarantee. 4.2.2 The minimum strip thickness of metal bellows should meet the requirements of Table 1 and Table 2. Note. The minimum strip thickness of flat tubes for large diameter steel strands not listed in the table should be determined according to the performance requirements of metal bellows. 4.3 Appearance The appearance of the metal bellows should be clean, and the inner and outer surfaces should be free of rust, oil stains, attachments, holes and irregular folds, and there should be no cracks and cracks on the bite. Tripped. 4.4 Dimensions 4.4.1 The allowable deviation of the dimensions of metal corrugated round pipes of different specifications shall meet the requirements of Table 3. 4.4.2 The allowable deviation of the size of metal corrugated flat pipes of different specifications shall meet the requirements of Table 4. Note. The specifications of the dimensions not listed in the table are determined by agreement between the supplier and the buyer. 4.4.3 The corrugation height hc of the metal corrugated round pipe shall not be less than that specified in Table 5. Note. The corrugated height of round pipes with a nominal inner diameter greater than 132mm should be adjusted according to performance requirements. 4.5 Anti-external load performance When the metal bellows is subjected to the local transverse load or uniform load specified in Table 6, the bellows should not be cracked or tripped. The amount of deformation should meet the requirements of Table 6. 4.6 Anti-leakage performance After being subjected to the local lateral loads specified in Table 6 or under specified bending conditions, the metal bellows shall not seep out of cement slurry. 4.7 Connecting pipe The connecting pipe should have the same waveform as the connected pipe, and the size should be one size larger; the length of the connecting pipe should be the nominal inner diameter of the round pipe or the flat pipe The equivalent nominal inner diameter is 4 to 5 times, and should not be less than 300mm.

5 Test method

5.1 Appearance The appearance can be inspected by visual inspection. 5.2 Dimensions 5.2.1 Measuring tools. Vernier calipers should be used for the measurement of inner and outer diameters; micrometers should be used for thickness measurement of steel strips; steel for length measurement Tape measure; depth gauge should be used to measure corrugation height. 5.2.2 Measuring method. the inner diameter of the round tube should be measured separately from the inner diameters of the two ends of the test piece in two directions perpendicular to each other, and the arithmetic average value is taken; The dimensions of the inner long axis and the inner short axis shall be measured respectively at the two ends of the test piece, and the arithmetic average values shall be taken respectively; the thickness and corrugation of the steel strip The height shall be measured at both ends of the test piece, and the arithmetic average shall be taken. Avoid corrugations and bite positions during measurement. 5.2.3 The measurement results of the thickness of the steel strip of each test piece shall meet the requirements of 4.2.2, and the measurement results of other dimensions shall meet the requirements of 4.4. set. 5.3 Anti-external load performance test 5.3.1 Test piece The length of the test piece shall be 5 times the nominal inner diameter of the round tube or the equivalent nominal inner diameter of the flat tube, and shall not be less than 300mm. 5.3.2 Load device A universal testing machine can be used for loading. The range of the testing machine should match the test load. The level of the testing machine should not be lower than 1.0. The resolution should not be less than 10N, and the resolution of displacement should not be less than 0.02mm; weights and auxiliary devices can also be used to load. 5.3.3 Deformation measurement method When the applied external load reaches 10N, the deformation is measured. The amount of deformation can be measured directly at the loading place with a dial indicator, or by a testing machine Displacement meter reads directly. 5.3.4 Test method of anti-local lateral load performance The test method of anti-local lateral load performance shall meet the following requirements. a) As shown in Figure 4, take a point at the trough in the middle of the test piece, and use a cylindrical indenter with an end of φ10mm and a lateral length of 150mm (such Figure 5) Apply local lateral load to the test piece to the specified value in Table 6 and hold the load; b) When the universal testing machine is used for loading, the loading speed should not exceed 20N/s; when using weights and auxiliary devices for loading, add weights each time Should not exceed 10kg; c) Measure the deformation of the test piece in accordance with the provisions of 5.3.3 under the load state, and calculate the deformation ratio δ, and observe whether the test piece has bite cracks, Tripping or other damage phenomena. When measuring deformation, the holding time should not be shorter than 1 min; d) Each test piece is tested once, and the deformation ratio δ of the test piece shall meet the requirements of 4.5. 5.3.5 Test method of anti-uniform load performance The test method for uniform load resistance should include the following. a) As shown in Figure 6, apply a uniform load to the test piece to the specified value in Table 6 and hold the load through the upper and lower loading plates and the sponge pad; b) When the universal testing machine is used for loading, the loading speed should not exceed 20N/s; when using weights and auxiliary devices for loading, add weights each time Should not exceed 10kg; c) Measure the deformation of the test piece in accordance with the provisions of 5.3.3 under the load state, and calculate the deformation ratio δ, and observe whether the test piece has bite cracks, Tripping or other damage phenomena. When measuring deformation, the holding time should not be shorter than 1 min; d) Each test piece is tested once, and the deformation ratio δ of the test piece shall meet the requirements of 4.5. 5.4 Anti-leakage performance test 5.4.1 Anti-leakage performance test after partial lateral load 5.4.1.1 Specimen production The length of the test piece shall be 5 times the nominal inner diameter of the round tube or the equivalent nominal inner diameter of the flat tube, and shall not be less than 300mm. According to the test method specified in 5.3 Load, the indenter is placed in the middle of the metal bellows. Apply local transverse load until the deformation reaches the nominal inner diameter of round pipe or flat pipe Weigh 20% of the size of the inner short shaft and unload after holding the load for 1 min to form a test piece. 5.4.1.2 Test method Seal one end of the specimen tightly and place it upright. Fill the test piece with ordinary Portland cement slurry with a water-cement ratio of 0.50 and observe the surface leakage of the test piece 30min; You can also fill the test piece with clean water. If the test piece does not seep water, you can no longer use cement slurry for the test. Each test piece is tested once, and the test result should meet the requirements of 4.6. 5.4.2 Anti-leakage performance test after bending 5.4.2.1 Specimen production The length of the test piece is 1500mm. Bend the test piece into an arc shape. The radius of curvature R of the round tube should be 30 times the nominal inner diameter of the round tube. The radius of curvature R should be 4000mm. 5.4.2.2 Test method The test piece is placed vertically as shown in Figure 7, the lower end is sealed tightly, and the test piece is filled with ordinary Portland cement grout with a water-cement ratio of 0.50, and the surface leakage is observed. Condition for 30 minutes; the test piece can also be filled with clean water. If the test piece does not seep water, the cement slurry test can no longer be used. Each test piece is tested once, and the test result should meet the requirements of 4.6.

6 Inspection rules

6.1 Inspection classification 6.1.1 All products shall undergo factory inspection and type inspection. For the quality inspection record table, please refer to Appendix A. 6.1.2 The factory inspection shall be carried out by the quality inspection department of the manufacturer, and the factory shall leave the factory only after passing the inspection. 6.1.3 Type inspection should be carried out in any of the following situations. a) Trial type appraisal of new products or old products transferred to factories; b) After the formal production, the material, equipment, and process change may affect the product performance; c) During normal production, it should be inspected every 2 years; d) When the product has been discontinued for more than half a year and resumed production; e) When there is a big difference between the factory inspection result and the last type inspection. 6.2 Inspection items The inspection items of factory inspection and type inspection shall meet the requirements of Table 7. 6.3 Batching and sampling 6.3.1 Factory inspection The factory inspection should be carried out in batches. Each batch shall consist of products manufactured by the same batch of steel belts produced by the same steel belt manufacturer. Every six months or cumulative The production volume of 50000m is one batch. The appearance should be fully inspected, and the sampling quantity for other items is 3 pieces. 6.3.2 Type inspection The metal corrugated round pipes with the same cross-sectional shape and the same performance requirements should be grouped according to the following regulations, and each group should select one specification Type inspection for representative products. a) When the nominal inner diameter is less than or equal to 60mm, it is a small specification group; b) When the nominal inner diameter is greater than 60mm and less than or equal to 90mm, it is the medium specification group; c) When the nominal inner diameter is greater than 90mm, it is a large specification group; d) Flat tubes with the same nominal inner short axis are a group. The sampling quantity of all type inspection items is 6 pieces. 6.4 Judgment of inspection results When all the factory inspection items meet the requirements, the batch of products shall be judged to be qualified; when the inspection results have unqualified items, the same In the batch of products that have not been sampled, double the sampling to re-inspect the unqualified items. If the re-inspection results are all qualified, the batch of products shall be determined as qualified Otherwise, the batch of products shall be judged as unqualified. When all the type inspection items meet the requirements, the type inspection shall be judged as qualified; when the inspection results have unqualified items, the The project shall be re-sampled and re-inspected. All the re-inspection results are qualified, and the type inspection shall be determined as qualified, otherwise the type inspection shall be determined as unqualified.

7 Packaging and marking

7.1 The factory product should be accompanied by a quality assurance certificate. The quality assurance letter shall indicate the product code, number of roots, length, production date, name of the manufacturer and Inspector's mark. 7.2 The delivered products should be accompanied by the delivery inspection report of this inspection lot.

8 Transportation and storage

8.1 Wear gloves for protection during product handling. 8.2 It should be handled with care during transportation, and should not be thrown, thrown or dragged; the hoisting process should ensure that the product is not damaged. 8.3 When loading the car, the bottom of the car should be flat, no heavy objects should be stacked on the upper part, and the end should not be extended out of the car. After loading, the rope should be fastened and used. Cover tightly with thatch cloth. 8.4 When the product is kept in the warehouse for a long time, the warehouse should be kept dry, and moisture-proof and ventilation measures should be provided. 8.5 The outdoor storage time of the product should not be too long, and it should not be directly stacked on the ground and covered with thatch cloth. 8.6 The stacking height of products should not exceed 3m. 9 Use 9.1 Galvanized metal corrugated pipes should be used for cast-in-place prestressing projects; during the production of precast components, ensure that the metal corrugated pipes are not corroded Bottom, non-galvanized metal bellows can be used. 9.2 Standard metal bellows can be used when the pre-stretching process is adopted for the pre-stressed concrete project; Strong metal bellows. Reinforced metal bellows are also suitable for ......

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Question 5: Should I purchase the latest version JG/T 225-2020?

Answer: Yes. Unless special scenarios such as technical constraints or academic study, you should always prioritize to purchase the latest version JG/T 225-2020 even if the enforcement date is in future. Complying with the latest version means that, by default, it also complies with all the earlier versions, technically.