CN113790970A - Testing method for cutting concrete compressive strength by using water gun - Google Patents
Testing method for cutting concrete compressive strength by using water gun Download PDFInfo
- Publication number
- CN113790970A CN113790970A CN202111027832.9A CN202111027832A CN113790970A CN 113790970 A CN113790970 A CN 113790970A CN 202111027832 A CN202111027832 A CN 202111027832A CN 113790970 A CN113790970 A CN 113790970A
- Authority
- CN
- China
- Prior art keywords
- concrete
- water gun
- cutting
- compressive strength
- concrete compressive
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 88
- 238000012360 testing method Methods 0.000 title claims abstract description 27
- 238000010998 test method Methods 0.000 claims abstract description 11
- 230000006835 compression Effects 0.000 claims description 9
- 238000007906 compression Methods 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 8
- 238000004519 manufacturing process Methods 0.000 claims description 6
- 238000005259 measurement Methods 0.000 claims description 6
- 239000004575 stone Substances 0.000 claims description 6
- 239000007921 spray Substances 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 3
- 239000013049 sediment Substances 0.000 claims description 3
- 238000005406 washing Methods 0.000 claims description 2
- 238000011065 in-situ storage Methods 0.000 abstract description 4
- 238000004873 anchoring Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
- G01N3/12—Pressure testing
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
- G01N3/06—Special adaptations of indicating or recording means
- G01N3/062—Special adaptations of indicating or recording means with mechanical indicating or recording means
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0019—Compressive
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
- G01N2203/0042—Pneumatic or hydraulic means
- G01N2203/0048—Hydraulic means
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/0605—Mechanical indicating, recording or sensing means
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0682—Spatial dimension, e.g. length, area, angle
Abstract
The invention provides a cutting test method of a concrete compressive strength water gun. According to the invention, the in-situ cutting of the concrete is carried out by adopting the high-pressure water gun, the cutting depth and the cutting strength of the concrete are directly tested and calculated on site by utilizing the testing method for cutting the concrete by adopting the water gun, and the compressive strength f of the concrete can be rapidly and accurately tested.
Description
Technical Field
The invention relates to a cutting test method for a concrete compressive strength water gun, and belongs to the technical field of engineering geophysical prospecting.
Background
The concrete compression strength in-situ test comprises a rear anchoring method, a small-diameter single shear method and the like, but the method adopts the tensile strength and the shear strength of the concrete to estimate the compression strength of the concrete, and belongs to an indirect measurement method; and because the test surface and the test range are small, the discreteness of the strength test data is large, and the accuracy of detecting the concrete compressive strength estimated value is difficult to guarantee.
Disclosure of Invention
In order to solve the technical problems, the invention provides a test method for cutting concrete compressive strength by using a water gun, which utilizes the positive correlation between the cutting strength and the compressive strength of the concrete of the same type, and adopts a high-pressure water gun to carry out on-site in-situ cutting on the concrete, so that the compressive strength of the concrete is directly obtained by on-site test and calculation.
The invention is realized by the following technical scheme.
The invention provides a testing method for cutting concrete compressive strength by a water gun; the structure of the water gun comprises a water gun main body and a support frame, wherein the water gun main body is connected with the support frame through a water gun cross rod, one end of the water gun main body is provided with a water gun spray head, and the other end of the water gun main body is connected with a water supply pipe;
the method comprises the following steps:
arranging parallel measuring lines: arranging a measuring line on the concrete surface of the test area, wherein a plurality of measuring points are uniformly arranged on the measuring line;
cutting by a high-pressure water gun: the water gun main body is arranged on a support frame by utilizing a water gun cross rod and a cross rod clamp, the positions of the water gun main body and a water gun nozzle are fixed by screwing a rod clamp nut, the support frame is moved to one end of a measuring line, and the water gun main body is moved and cut at a constant speed along the measuring line in a retreating mode;
measuring the cutting depth: after cutting, washing the cutting groove sediment with clear water, and measuring the cutting groove depth h of the measuring line (9) by using a micrometeriCalculating an average depth value h;
acquiring a concrete compressive strength template: (1) manufacturing a series of standard concrete Cj with different labels by using the same stone and gradation in advance, and carrying out a laboratory concrete compressive strength test to obtain standard concrete compressive strength values fj with different labels; (2) cutting and depth measurement are carried out by adopting water gun nozzles with the same cutting parameters, and the average depth value hj corresponding to the standard concrete Cj of the serial labels is calculated; (3) drawing a concrete compressive strength value f curve by using a spline curve by taking the average depth value hj as a horizontal coordinate and the concrete compressive strength value fj corresponding to the standard concrete Cj as a vertical coordinate, and manufacturing a concrete compressive strength template with the cutting depth corresponding to the concrete compressive strength value;
and fifthly, acquiring the concrete compressive strength value, namely performing corresponding search on the concrete compressive strength template according to the average depth value h tested in the test area to acquire the concrete compressive strength value f of the test area.
The bottom of support frame is connected with a plurality of pulleys.
The water gun cross rod is connected with the support frame through a cross rod clamp and a rod clamp nut.
In the step I, two groups of on-site water guns which are perpendicular to each other are arranged on the surface of the concrete to cut parallel measuring lines.
And in the second step, cutting along the two groups of measuring lines at a constant speed respectively.
In the second step, the cutting parameters of the water gun nozzle (2) comprise a diameter of 0.33mm, a target distance of 20mm, a water pressure of 350Mpa, and a horizontal uniform movement speed of 10mm for a time of min-1。
The step IV comprises the following steps:
(4.1) previously making a series of standard concrete Cj with different labels by using the same stone material and gradation, and totally adding 8 groups: c15, C20, C25, C30, C35, C40, C45, C50, 4 blocks per group;
(4.2) taking 3 blocks of 8 groups of standard concrete, and performing a laboratory concrete compressive strength test to obtain standard concrete compressive values fj of different labels;
(4.3) cutting and depth measurement are carried out on the remaining 1 block of each group by adopting water gun nozzles with the same cutting parameters, and the average depth value hj corresponding to the standard concrete Cj of the serial labels is calculated;
(4.4) because of the negative correlation relationship that the higher the grade of the concrete is, the shallower the cutting depth is, the higher the hj is taken as the abscissa, the concrete compressive strength value fj corresponding to the standard concrete Cj is taken as the ordinate, the spline curve is adopted to draw the concrete compressive strength value f curve, and the corresponding template of the cutting depth and the concrete compressive strength value is manufactured.
In the third step, the depth h of the groove of the measuring line is measured by a micrometer with the point distance of 5mmi。
The invention has the beneficial effects that: the in-situ cutting of the concrete is carried out on site by adopting a high-pressure water gun, the cutting depth and the concrete compressive strength value are manufactured by utilizing a test method of cutting by using the water gun, the compressive strength of the concrete is directly obtained by field test and calculation, and the compressive strength value f of the concrete can be rapidly and accurately tested.
Drawings
FIG. 1 is a schematic illustration of a water gun according to the present invention;
FIG. 2 is a schematic view of a wire layout of the present invention;
in the figure: the method comprises the following steps of 1-a water gun body, 2-a water gun nozzle, 3-a water supply pipe, 4-a support frame, 5-a water gun cross rod, 6-a cross rod clamp, 7-a rod clamp screw cap, 8-a pulley, 9-a measuring line, 10-a measuring point and 11-a concrete surface.
Detailed Description
The technical solution of the present invention is further described below, but the scope of the claimed invention is not limited to the described.
A method for testing the cutting of a concrete compressive strength water gun as shown in fig. 1 and 2; the water gun structurally comprises a water gun main body 1 and a support frame 4, wherein the water gun main body 1 is connected with the support frame 4 through a water gun cross rod 5, one end of the water gun main body 1 is provided with a water gun spray head 2, and the other end of the water gun main body is connected with a water supply pipe 3;
the method comprises the following steps:
arranging a parallel measuring line 9: arranging a measuring line 9 on a concrete surface 11 of a test area, wherein a plurality of measuring points 10 are uniformly arranged on the measuring line 9;
cutting by a high-pressure water gun: the water gun body 1 is arranged on a support frame 4 by utilizing a water gun cross rod 5 and a cross rod clamp 6, the positions of the water gun body 1 and a water gun nozzle 2 are fixed by screwing a rod clamp nut 7, the support frame 4 is moved to one end of a measuring line 9, and the water gun is moved and cut at a constant speed along the measuring line 9 in a retreating mode;
measuring the cutting depth: after the cutting is finished, the cutting groove sediment is washed by clear water, and the cutting groove depth h of the measuring line 9 is measured by a micrometeriCalculating an average depth value h;
acquiring a concrete compressive strength template: (1) manufacturing a series of standard concrete Cj with different labels by using the same stone and gradation in advance, and carrying out a laboratory concrete compressive strength test to obtain standard concrete compressive strength values fj with different labels; (2) cutting and depth measurement are carried out by adopting water gun nozzles with the same cutting parameters, and the average depth value hj corresponding to the standard concrete Cj of the serial labels is calculated; (3) drawing a concrete compressive strength value f curve by using a spline curve by taking the average depth value hj as a horizontal coordinate and the concrete compressive strength value fj corresponding to the standard concrete Cj as a vertical coordinate, and manufacturing a concrete compressive strength template with the cutting depth corresponding to the concrete compressive strength value;
and fifthly, acquiring the concrete compressive strength value, namely performing corresponding search on the concrete compressive strength template according to the average depth value h tested in the test area to acquire the concrete compressive strength value f of the test area.
The bottom of the support frame 4 is connected with a plurality of pulleys 8.
The water gun cross rod 5 is connected with the support frame 4 through a cross rod clamp 6 and a rod clamp nut 7.
In the step I, two groups of on-site water guns which are perpendicular to each other are arranged on a concrete surface 11 to cut parallel measuring lines 9.
In the second step, the cutting is carried out at a constant speed along the two groups of measuring lines 9 respectively.
In the second step, the cutting parameters of the water gun nozzle 2 include diameter of 0.33mm, target distance of 20mm, water pressure of 350Mpa, horizontal uniform movement speed of 10mm, and a value of min-1。
The step IV comprises the following steps:
(4.1) previously making a series of standard concrete Cj with different labels by using the same stone material and gradation, and totally adding 8 groups: c15, C20, C25, C30, C35, C40, C45, C50, 4 blocks per group;
(4.2) taking 3 blocks of 8 groups of standard concrete, and performing a laboratory concrete compressive strength test to obtain standard concrete compressive values fj of different labels;
(4.3) cutting and depth measurement are carried out on the rest 1 block of each group by adopting the water gun nozzles 2 with the same cutting parameters, and the average depth value hj corresponding to the standard concrete Cj of the serial labels is calculated;
(4.4) because of the negative correlation relationship that the higher the grade of the concrete is, the shallower the cutting depth is, the higher the hj is taken as the abscissa, the concrete compressive strength value fj corresponding to the standard concrete Cj is taken as the ordinate, the spline curve is adopted to draw the concrete compressive strength value f curve, and the corresponding template of the cutting depth and the concrete compressive strength value is manufactured.
In the third step, the depth h of the groove of the measuring line 9 is measured by a micrometer at a point distance of 5mmi。
Claims (8)
1. A testing method for cutting concrete compressive strength by a water gun is characterized by comprising the following steps: the water gun structurally comprises a water gun main body (1) and a support frame (4), wherein the water gun main body (1) is connected with the support frame (4) through a water gun cross rod (5), one end of the water gun main body (1) is provided with a water gun spray head (2), and the other end of the water gun main body is connected with a water supply pipe (3);
the method comprises the following steps:
arranging a parallel measuring line (9): arranging a measuring line (9) on the concrete surface (11) of the test area, wherein a plurality of measuring points (10) are uniformly arranged on the measuring line (9);
cutting by a high-pressure water gun: the water gun body (1) is installed on a support frame (4) by utilizing a water gun cross rod (5) and a cross rod clamp (6), the positions of the water gun body (1) and a water gun spray head (2) are fixed by screwing a rod clamp nut (7), the support frame (4) is moved to one end of a measuring line (9), and the water gun is moved and cut at a constant speed along the measuring line (9) in a retreating mode;
measuring the cutting depth: after cutting, washing the cutting groove sediment with clear water, and measuring the cutting groove depth h of the measuring line (9) by using a micrometeriCalculating an average depth value h;
acquiring a concrete compressive strength template: (1) manufacturing a series of standard concrete Cj with different labels by using the same stone and gradation in advance, and carrying out a laboratory concrete compressive strength test to obtain standard concrete compressive strength values fj with different labels; (2) cutting and depth measurement are carried out by adopting water gun nozzles with the same cutting parameters, and the average depth value hj corresponding to the standard concrete Cj of the serial labels is calculated; (3) drawing a concrete compressive strength value f curve by using a spline curve by taking the average depth value hj as a horizontal coordinate and the concrete compressive strength value fj corresponding to the standard concrete Cj as a vertical coordinate, and manufacturing a concrete compressive strength template with the cutting depth corresponding to the concrete compressive strength value;
and fifthly, acquiring the concrete compressive strength value, namely performing corresponding search on the concrete compressive strength template according to the average depth value h tested in the test area to acquire the concrete compressive strength value f of the test area.
2. The cutting test method of the concrete compression strength water gun according to claim 1, characterized in that: the bottom of the support frame (4) is connected with a plurality of pulleys (8).
3. The cutting test method of the concrete compression strength water gun according to claim 1, characterized in that: the water gun cross rod (5) is connected with the support frame (4) through a cross rod clamp (6) and a rod clamp nut (7).
4. The cutting test method of the concrete compression strength water gun according to claim 1, characterized in that: in the step I, two groups of on-site water guns (9) which are perpendicular to each other are arranged on the concrete surface (11) to cut parallel measuring lines.
5. The cutting test method of the concrete compression strength water gun according to claim 1, characterized in that: in the second step, cutting is carried out at a constant speed along the two groups of measuring lines (9) respectively.
6. The cutting test method of the concrete compression strength water gun according to claim 1, characterized in that: in the second step, the cutting parameters of the water gun nozzle (2) comprise a diameter of 0.33mm, a target distance of 20mm, a water pressure of 350Mpa, and a horizontal uniform movement speed of 10mm for a time of min-1。
7. The cutting test method of the concrete compression strength water gun according to claim 1, characterized in that: the step IV comprises the following steps:
(4.1) previously making a series of standard concrete Cj with different labels by using the same stone material and gradation, and totally adding 8 groups: c15, C20, C25, C30, C35, C40, C45, C50, 4 blocks per group;
(4.2) taking 3 blocks of 8 groups of standard concrete, and performing a laboratory concrete compressive strength test to obtain standard concrete compressive values fj of different labels;
(4.3) cutting and depth measurement are carried out on the remaining 1 block of each group by adopting the water gun nozzles (2) with the same cutting parameters, and the average depth value hj corresponding to the standard concrete Cj of the serial labels is calculated;
(4.4) because of the negative correlation relationship that the higher the grade of the concrete is, the shallower the cutting depth is, the higher the hj is taken as the abscissa, the concrete compressive strength value fj corresponding to the standard concrete Cj is taken as the ordinate, the spline curve is adopted to draw the concrete compressive strength value f curve, and the corresponding template of the cutting depth and the concrete compressive strength value is manufactured.
8. The cutting test method of the concrete compression strength water gun according to claim 1, characterized in that: in the third step, the depth h of the groove of the measuring line (9) is measured by a micrometer with the point distance of 5mmi。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111027832.9A CN113790970A (en) | 2021-09-02 | 2021-09-02 | Testing method for cutting concrete compressive strength by using water gun |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111027832.9A CN113790970A (en) | 2021-09-02 | 2021-09-02 | Testing method for cutting concrete compressive strength by using water gun |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113790970A true CN113790970A (en) | 2021-12-14 |
Family
ID=79182551
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111027832.9A Pending CN113790970A (en) | 2021-09-02 | 2021-09-02 | Testing method for cutting concrete compressive strength by using water gun |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113790970A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110094295A1 (en) * | 2009-10-28 | 2011-04-28 | Halliburton Energy Services, Inc. | Cement testing |
| CN102305740A (en) * | 2011-08-03 | 2012-01-04 | 安徽省（水利部淮河水利委员会）水利科学研究院 | Detection method of compression strength of concrete structure |
| CN107192626A (en) * | 2017-06-22 | 2017-09-22 | 广东盖特奇新材料科技有限公司 | A kind of concrete anti-abrasion performance test apparatus and test method |
| KR101895771B1 (en) * | 2017-11-21 | 2018-09-07 | 주식회사 이레하이테크이앤씨 | Unmanned driving water jet apparatus for concrete chipping |
| CN208730030U (en) * | 2018-05-29 | 2019-04-12 | 广东碧通防水补强技术应用工程有限公司 | A kind of giant bracket for concrete cutting |
| CN109632512A (en) * | 2019-01-24 | 2019-04-16 | 贵州恒安工程试验检测有限公司 | A kind of concrete compressive strength detecting device and its detection method |
| CN110057705A (en) * | 2019-05-31 | 2019-07-26 | 湖南师范大学 | Cutter ring abrasion test device and test method under a kind of water jet and corrosive liquid |
-
2021
- 2021-09-02 CN CN202111027832.9A patent/CN113790970A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110094295A1 (en) * | 2009-10-28 | 2011-04-28 | Halliburton Energy Services, Inc. | Cement testing |
| CN102305740A (en) * | 2011-08-03 | 2012-01-04 | 安徽省（水利部淮河水利委员会）水利科学研究院 | Detection method of compression strength of concrete structure |
| CN107192626A (en) * | 2017-06-22 | 2017-09-22 | 广东盖特奇新材料科技有限公司 | A kind of concrete anti-abrasion performance test apparatus and test method |
| KR101895771B1 (en) * | 2017-11-21 | 2018-09-07 | 주식회사 이레하이테크이앤씨 | Unmanned driving water jet apparatus for concrete chipping |
| CN208730030U (en) * | 2018-05-29 | 2019-04-12 | 广东碧通防水补强技术应用工程有限公司 | A kind of giant bracket for concrete cutting |
| CN109632512A (en) * | 2019-01-24 | 2019-04-16 | 贵州恒安工程试验检测有限公司 | A kind of concrete compressive strength detecting device and its detection method |
| CN110057705A (en) * | 2019-05-31 | 2019-07-26 | 湖南师范大学 | Cutter ring abrasion test device and test method under a kind of water jet and corrosive liquid |
Non-Patent Citations (1)
| Title |
|---|
| 王晓敏 等: "高压水射流技术译文集", 煤炭工业出版社, pages: 253 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| WO2019119676A1 (en) | Method for experimentally determining effect of acid liquid on young's modulus of tight carbonate rock | |
| CN103760103B (en) | Use the test method of pitch and the adhesion test unit that gathers materials | |
| CN105089498A (en) | Experiment device and method for deep-water jetting, guiding pipe releasing and well drilling | |
| CN113588457A (en) | Roadway impact resistance calculation method considering support-pressure relief-surrounding rock coupling effect | |
| CN103528899A (en) | Tube forming performance testing device and method under combined action of internal and external pressure | |
| CN201786356U (en) | Automatic compact device of sand-filling tube model for physical simulation | |
| CN113790970A (en) | Testing method for cutting concrete compressive strength by using water gun | |
| CN107060714A (en) | Study the large-scale real triaxial Logistics automatic system method of thin interbed fracturing fracture Extending Law | |
| CN103344468A (en) | Stress control type soil engineering sample pressing apparatus | |
| CN103148809B (en) | Petroleum pipe outer taper pipe thread parameter measuring apparatus and measuring method | |
| CN112525672B (en) | Shale reservoir brittleness testing device and method based on crack propagation energy evolution | |
| CN111595677B (en) | Soft rock long-term strength value determining method and soft rock bearing capacity determining method | |
| CN110865122A (en) | Simple detection method for high-speed rail ballastless track slab | |
| CN205209936U (en) | Prepare and seepage flow device of rock fracture | |
| CN201720288U (en) | Bar wire sample straightener | |
| CN107449828B (en) | A kind of rock-fill concrete structure space compactness inspection method and evaluation method | |
| CN110646583B (en) | Method and device for coal seam water injection similar simulation test | |
| CN105003246A (en) | Method for determining horizontal well fracture number | |
| CN108489809A (en) | The method for calculating coarse dislocation Fracture Deformation amount under stress using laboratory facilities | |
| CN201993070U (en) | Device for measuring shaft sleeve workpiece | |
| CN209970272U (en) | Horizontal detection tool of machine tool base | |
| CN207540503U (en) | Slidingtype roof to floor convergence measuring device | |
| CN206876112U (en) | Numerical control punching machine X-axis rail linearity degree measurement apparatus | |
| CN207717550U (en) | Curved straight fatigue experimental device based on strain controlling | |
| CN210346644U (en) | Depth probe for chute welding repair of coal mining machine |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |