Some standard content:
UDC 681.2: 691.058
National Standard of the People's Republic of China
GB 9138-—88
Rebound Hammer
Concrete Test Hammer
Published on 1988-05-05
Published by the National Bureau of Standards
Implemented on 1988-10-01
Standardized Product
1 Subject Content and Scope of Application
National Standard of the People's Republic of China
Concrete Test Hammer
GB9138-88
This standard specifies the classification, technical requirements, test methods, inspection rules, marking, packaging, transportation and storage of rebound hammers. This standard applies to rebound hammers for testing the compressive strength of hardened concrete and rebound hammers for testing the compressive strength of sintered ordinary bricks. This standard applies to various direct-injection rebound hammers with impact kinetic energy of 29.430J (3kgf·m); 2.207J (0.225kgf:m); 0.735J (0.075kgf·m).
2 Reference standards
ZBY002 Basic environmental conditions and test methods for transportation and storage of instruments and meters 3 Terms and symbols
3.1 Terms
Calibration—
- In order to maintain the technical performance stability of the rebound hammer and ensure the test accuracy of the instrument and the consistency of the test results, the technical condition of the rebound hammer is calibrated, which is called calibration. 3.2 Symbols
R—Rebound value
The average rebound value calibrated by the rebound hammer on the steel anvil 4 Classification of rebound hammers
4.1 Types
a. Vernier direct reading type—a rebound hammer whose rebound value can be read directly from the scale of the instrument through the indication line of the pointer slider; b: Electronic digital display type—a rebound hammer whose rebound value is displayed by a digital tube or liquid crystal through a resistive displacement sensor and an electronic system. Its variant code is "S\;
Digital... In addition to the electronic digital display function, it can also automatically print and record the rebound value through a micro printer. Its variant code is "SJ";
d. Fully automatic digital type
A rebound hammer that adopts large-scale integrated circuit microcomputer technology and can perform strength calculation and automatic printing. Its variant code is "W".
4.2 Model of rebound hammer
Approved by the Ministry of Urban and Rural Construction and Environmental Protection on April 15, 1988 and implemented on October 1, 1988
GB9138--88
The model of rebound hammer is composed of instrument, main parameter, update and variant code. The model description is as follows: Update code: 4, B, (
Update, variant code block
Variant code: (as shown in 1.1)
Main parameter code: impact kinetic energy.
Equipment code: Net spring instrument
"4.2 Marking example
The impact kinetic energy is 2.207J. The first updated rebound hammer: rebound hammer HT225AGB9138-88
4.3 Specification series of rebound hammer||t t||The specification series of the rebound tester shall comply with the provisions of Table 1. Table 1
Impact kinetic energy
Rebound tester model
HT3000
HT225A
HT225S
HT225SJ
HT225W
Strike hammer
Working stroke
Specification series of rebound tester
Strike ball surface
Radius of curvature
(SR)mm
Calibrated on steel anvilAverage
Rebound value
Note: The main parameter code in the rebound tester model is the non-legal measurement unit (impact kinetic energy kgf·m) in Chapter 1 multiplied by 1000. 5 Technical requirements
5.1 The rebound tester shall comply with The provisions of this standard shall be complied with and the drawings and process documents approved by the prescribed procedures shall be followed. 5.2 The rebound hammer shall meet the following requirements after assembly: 5.2.1 The impact kinetic energy of the rebound hammer when it is struck shall comply with the provisions of Table 1. Quality
5.2.2 The working stroke of the impact hammer shall comply with the provisions of Table 1. When the impact hammer is unhooked, the indication line of the pointer slider corresponds to the "100" position on the scale. When the impact hammer rebounds, the indication line of the pointer slider corresponds to the "0\ position on the scale. 5.2.3 At the moment of collision between the impact hammer and the impact rod, the impact tension spring is in a free state. 5.2.4 The static friction force of the pointer slider: For a rebound hammer with an impact kinetic energy of 29.430J, it should be in the range of 0.98~1.47N; for a rebound hammer with an impact kinetic energy of 2.207J, it should be in the range of 0.49~0.78N; for The rebound hammer with a hardness of 0.735J should be within the range of 0.39~0.59N; no lubricating oil is allowed on the pointer shaft.
5.2.5 The radius of curvature (SR) of the impact ball surface of the impact rod shall comply with the provisions of Table 1. 5.2.6 The hardness of the collision surface between the impact hammer and the impact rod shall be HRC59~63, and no oil or other dirt is allowed on the collision surface. 5.2.7 The center guide rod shall be coated with a thin layer of watch oil for lubrication, and other parts shall not be oiled. 5.2.8 When the rebound hammer is calibrated vertically downward with a steel anvil with a hardness of HRC58~62., the average rebound value (mr) shall comply with the provisions of Table 1. The calibration shall be carried out at a temperature of 20±5℃, and the steel anvil shall be placed on a concrete floor with greater rigidity. The number of impacts during calibration shall not be less than 10 times, and the impact rod can be rotated at any angle. 5.3 The oxidation dyeing color of the rebound hammer shell shall be consistent, and no patterns or variegated colors and scratches and collision marks are allowed. 5.4 The rebound value of the rebound hammer is read to an integer.
5.5 Quality classification of rebound hammer
GB° 9138--88
The quality of the rebound hammer is divided into qualified products, first-class products and superior products according to the provisions of Table 2. Table 2 Quality classification of rebound hammer
Average
Rebound value (mr) calibrated on steel Allowable deviation
Average number of rebound hammers without
Fault||Appearance quality
Qualified products
Oxidation dyeing color is basically the same,
No obvious scratches and collision marks
5.6 The rebound hammer is subjected to high and low temperature storage test according to ZBY002. Quality grade
First-class products
The color tone of oxidation dyeing is basically the same,
No scratches and collision marks
5.7 The rebound hammer should be inspected regularly according to the specified average number of trouble-free impacts. Superior products
The color tone of oxidation dyeing is consistent,
No scratches and collision marks
5.8 Under the condition that the user keeps and uses the rebound hammer in accordance with the instruction manual, the manufacturer shall replace or repair it free of charge (except for wearing parts) within three months from the date of purchase if it is damaged or cannot work normally due to poor manufacturing quality. 5.9 The rebound hammer should be shipped with a product certificate before leaving the factory. 6 Test method
The rebound hammer shall be type tested every year according to 5.6 and 5.7, and the number of samples shall not be less than 3. 6.1 High temperature test
6.1.1 Test temperature and time
Test temperature: 40±2℃
Holding time: 8h
6.1.2 Heating rate
Not more than 1℃ per minute,
6.1.3 Test method
Perform the test in accordance with the provisions of 6.1.1 and 6.1.2; after the test, the temperature of the rebound hammer shall be lowered to room temperature and then taken out, and placed under normal working conditions for not less than 24h, and then in accordance with 5.2.8, the average rebound value (m) shall comply with the provisions of Table 1. 6.2 Low temperature test
6.2.1 Test temperature and time
Test temperature: -40±2℃
Holding time: 8h
6.2.2 Cooling rate
Not more than 1℃ per minute.
6.2.3 Test method
Perform the test in accordance with the provisions of 6.2.1 and 6.2.2. After the test, the temperature of the rebound tester shall rise to room temperature and then be taken out and placed under normal working conditions for not less than 24 hours. Then, according to 5.2.8, the average rebound value (m) shall comply with the provisions of Table 1. 3
6.3 Continuous impact test
GB9138—88
6.3.1 Installation
Fix the rebound tester on the continuous impact table with a pressure plate, and place a rubber pad or felt pad between the pressure plate and the rebound tester. 6.3.2. Test conditions
Acceleration: 10±1g
Corresponding pulse duration: 11±2ms
Continuous impact times: 1000±2 times
Pulse waveform: Approximate semi-positive waveform
6.3.3 Test method
After testing in accordance with 6.3.2 and in accordance with 5.2.8, the average rebound value (mR) shall comply with the provisions of Table 1. 6.4 Rebound hammer mean time failure test
6.4.1 Installation
For rebound hammers with impact kinetic energy of 2.207 J and 0.735 J, they shall be fixed on a special automatic testing device, but the axis of the instrument shall be perpendicular to the impact surface of the anvil. For rebound hammers with impact kinetic energy of 29.43 J, the test shall be carried out on hand-tested steel. 6.4.2 Test conditions
Ambient temperature: 20±5℃
Continuous number of impacts: 3000 for qualified products
4500 for first-class products
·6000 for superior products
6.4.3 Test
After the test in accordance with 6.4.2, the technical performance of the rebound hammer shall comply with the provisions of this standard. 7 Inspection rules
7.1 Before the rebound hammer leaves the factory, the "100" unhooking point and the "0" starting point of the rebound hammer shall be tested in accordance with 5.2.2. 7.2 Before the rebound hammer leaves the factory, the appearance quality shall be tested in accordance with 5.3 and 5.5. 7.3 When the rebound hammer is tested in accordance with 5.2.8 before leaving the factory, the calibrated number of times shall be not less than 20 times, and the impact rod shall be rotated four times, each time by about 90°. Take the rebound values of the last three consecutive times with stable readings for five times of impact and average them. The average rebound value (mr) calibrated for each rotation of the impact rod shall comply with the provisions of Table 1, and the rebound value detected shall be filled in Table 3. The steel anvils used for inspection are all hand-tested steel anvils (see Appendix A), and the automatic detection device dedicated to the rebound tester can also be used. Table 3
8 Marking, packaging, transportation, storage
8.1 Marking
The following markings shall be on the rebound tester:
Manufacturer name;
b. Product name;
Trademark;
Rebound tester calibration recordwwW.bzxz.Net
Rebound value R
d. Product model;
e. Product quality grade mark;
f. Manufacturing date and production batch number.
8.2 Packaging
9138-88
The rebound hammer can be packed in a plastic sleeve or wooden box. The outer packaging can be a paper box or a wooden box, and the inner packaging is filled with vibration-damping materials. 8.2.1
The technical documents shipped with the instrument should include:
a. Product certificate;
b. Instruction manual;
c. Packing list.
8.2.3 Accessories
One small grinding wheel and grinding stone
8.3 Transportation
It is strictly forbidden to collide with the instrument during transportation.
8.4 Storage
8.4.1 The instrument should be stored in a well-ventilated room where the air does not contain corrosive gases. 8.4.2
Periodically maintain and maintain the instrument during the storage period to avoid dust invasion. GB9138—88
Appendix A
Technical conditions for steel bricks used for rebound hammer calibration
(Supplement)
A1 The steel anvil is a special device for checking the rebound hammer. The steel anvil should be placed on a rigid concrete foundation or a solid tabletop and placed steadily. The impact surface of the steel anvil in contact with the rebound hammer ball surface should be a polished plane. A2 steel anvil classification
A2.1 Steel anvil model
It consists of equipment code and main parameters. Its model description is as follows: "A2.1 Marking example
Steel anvil with anvil mass of 16kg:
Steel anvil GZ16
A2·2 Steel specification series
Steel anvil model
GB9138-88\
Table 4 Steel anvil specification series
Impact surface hardness
HRC58~62
HRC 58~62
GZ16 steel anvil is suitable for rebound test with 2.207J and 0.735J impact kinetic energy. A4
GZ45 steel anvil is suitable for rebound test with 29.430J impact kinetic energy. The anvil body is made of steel and the anvil core is made of high-quality steel with a hardness of HRC58~62. The rebound value of the A5
rebound tester when calibrated on the steel anvil shall comply with the provisions of Table 1. Marking
The label on the steel anvil should have the following markings: a.
Manufacturer name;
Product name;
Trademark;
Product model;
Manufacturing date and production batch number.
The steel anvil should have a product certificate when it leaves the factory.
Wooden or iron boxes can be used for packaging, and the boxes should be filled with vibration-damping materials. Additional remarks:
This standard is provided by the Urban and Rural Construction Bureau. The Ministry of Environmental Protection Beijing Construction Machinery Research Institute is responsible for this standard. This standard was drafted by Tianjin Construction Instrument. Main parameters: Anvil mass
Equipment code: Steel brick
Mass kg
People's Republic of China
National standard
GB9138-88
Published by China Architecture & Building Press (Beijing West Suburb Baiwanzhuang) Issued by Xinhua Bookstore Beijing Distribution Office Sold by Xinhua Bookstores in various places Printed by Beijing Shunyi County Banqiao Printing Factory
Format: 880×1230 mm 1/16 Printing sheet: 1/2 Number of words: 14,000 words First edition in August 1989
First printing in August 1989
Print run: 1-2,250 copies
112·5978
Standard new book month 120-2
112:5978735J rebound tester. A4
GZ45 steel anvil is suitable for calibrating the rebound tester with an impact kinetic energy of 29.430J. The anvil body is a steel part, and the anvil core is a high-quality steel part with a hardness of HRC58~62. A5
The rebound value of the rebound tester when calibrated on the steel anvil shall comply with the provisions of Table 1, and the steel anvil mark
The label on the steel anvil shall have the following marks: a.
Manufacturer name;
Product name;
Trademark;
Product model;
Manufacturing date and production batch number.
The steel anvil shall have a product certificate when leaving the factory.
Wooden boxes or iron boxes can be used for packaging, and the boxes are filled with vibration-damping materials. Additional notes:
This standard is under the jurisdiction of the Beijing Institute of Comprehensive Construction Machinery of the Ministry of Urban and Rural Construction and Environmental Protection. This standard was drafted by Tianjin Building Instruments. Main parameters: Anvil mass
Equipment code: Steel brick
Mass kg
People's Republic of China
National standard
GB9138-88
Published by China Architecture & Building Press (Baiwanzhuang, western suburbs of Beijing) Issued by Xinhua Bookstore Beijing Distribution Office Sold by Xinhua Bookstores in various places Printed by Banqiao Printing Factory, Shunyi County, Beijing
Format: 880×1230 mm 1/16 Printing sheet: 1/2 Number of words: 14,000 words First edition in August 1989
First printing in August 1989
Print run: 1-2,250 copies
112·5978
Standard new book month 120-2
112:5978735J rebound tester. A4
GZ45 steel anvil is suitable for calibrating the rebound tester with an impact kinetic energy of 29.430J. The anvil body is a steel part, and the anvil core is a high-quality steel part with a hardness of HRC58~62. A5
The rebound value of the rebound tester when calibrated on the steel anvil shall comply with the provisions of Table 1, and the steel anvil mark
The label on the steel anvil shall have the following marks: a.
Manufacturer name;
Product name;
Trademark;
Product model;
Manufacturing date and production batch number.
The steel anvil shall have a product certificate when leaving the factory.
Wooden boxes or iron boxes can be used for packaging, and the boxes are filled with vibration-damping materials. Additional notes:
This standard is under the jurisdiction of the Beijing Institute of Comprehensive Construction Machinery of the Ministry of Urban and Rural Construction and Environmental Protection. This standard was drafted by Tianjin Building Instruments. Main parameters: Anvil mass
Equipment code: Steel brick
Mass kg
People's Republic of China
National standard
GB9138-88
Published by China Architecture & Building Press (Baiwanzhuang, western suburbs of Beijing) Issued by Xinhua Bookstore Beijing Distribution Office Sold by Xinhua Bookstores in various places Printed by Banqiao Printing Factory, Shunyi County, Beijing
Format: 880×1230 mm 1/16 Printing sheet: 1/2 Number of words: 14,000 words First edition in August 1989
First printing in August 1989
Print run: 1-2,250 copies
112·5978
Standard new book month 120-2
112:5978
Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.