CN105699203B - A kind of experimental rig and method for measuring construction material compression strength under confined pressure - Google Patents
A kind of experimental rig and method for measuring construction material compression strength under confined pressure Download PDFInfo
- Publication number
- CN105699203B CN105699203B CN201610251343.4A CN201610251343A CN105699203B CN 105699203 B CN105699203 B CN 105699203B CN 201610251343 A CN201610251343 A CN 201610251343A CN 105699203 B CN105699203 B CN 105699203B
- Authority
- CN
- China
- Prior art keywords
- pressure
- confined pressure
- bearing device
- bearing
- confined
- 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.)
- Active
Links
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
Abstract
The invention discloses a kind of experimental rig for measuring construction material compression strength under confined pressure,Including base,Reaction frame,Vertical loading device and horizontal loading device,The reaction frame is arranged on the middle of the base,The both sides of the reaction frame are arranged with horizontal loading device,To having vertical loading device on the crossbeam of the reaction frame,The vertical loading device bottom is connected with pressure-bearing device,The pressure-bearing device includes upper pressure-bearing device and lower pressure-bearing device,Center is supported equipped with hemispherical between the upper pressure-bearing device and lower pressure-bearing device,The upper pressure-bearing device is connected with lower pressure-bearing device by the guide rod on lower four angles of pressure-bearing device top surface,The guide rod passes through upper pressure-bearing device,And it is set with spring in the upper section of upper pressure-bearing device,The spring top is equipped with pressing plate,The pressing plate is fixed by the nut tightened on the guide bar.The present invention can load confined pressure load and vertical load to sample at the same time, can realize the maximum compressive strength of sample under different confined pressure loads.
Description
Technical field
The invention belongs to construction material (mainly based on concrete and concrete composite material) detection technique field, tool
Body is related to a kind of experimental rig and method for measuring construction material compression strength under confined pressure.
Background technology
With the fast development of China's economy, civil engineering industry also developing in high speed.More and more material quilts
For in civil engineering, with the appearance of more and more materials and structure type, more having promoted civil engineering industry
Development.Concrete structure is widely used to water conservancy work as most structure types is applied in contemporary building and hydraulic engineering
Journey, civil buildings, road and bridge, the extra large engineering such as work and harbour, nuclear power station and military protection.In concrete structure, give
Coagulation is gradually widely used with horizontal confined pressure to strengthen the structure of concrete vertical compression intensity.For example, a kind of new answers
Condensation material tire-soil is exactly that horizontal constraint is carried out to inner stuffing using tire, there is provided confined pressure, to improve the recombiner unit
The compression strength of body.These materials are directed to the problem of confined pressure, i.e.,：In the case where providing certain confined pressure, the material
The vertical compression intensity of material can improve how much, what degree can be brought up to.It is all using horizontal confined pressure to have many structures, is come
The structure or the vertical compression intensity of material are improved, so the invention of the device is necessary.
The content of the invention
The present invention is to solve the above-mentioned problems, it is proposed that a kind of experiment dress for measuring construction material compression strength under confined pressure
Put and method, the present invention can load confined pressure load and vertical load to sample at the same time, can realize and be tried under different confined pressure loads
The maximum compressive strength of sample.
To achieve these goals, the present invention adopts the following technical scheme that：
A kind of experimental rig for measuring construction material compression strength under confined pressure, including base, reaction frame, vertical loading dress
Put and horizontal loading device, the reaction frame are arranged on the middle of the base, the both sides of the reaction frame are arranged with laterally loading dress
To put, to vertical loading device is had on the crossbeam of the reaction frame, the vertical loading device bottom is connected with pressure-bearing device,
The pressure-bearing device includes upper pressure-bearing device and lower pressure-bearing device, center between the upper pressure-bearing device and lower pressure-bearing device
Supported equipped with hemispherical, the upper pressure-bearing device and lower pressure-bearing device pass through leading on lower four angles of pressure-bearing device top surface
Connected to bar, the guide rod passes through upper pressure-bearing device, and is set with spring, the spring in the upper section of upper pressure-bearing device
Top is equipped with pressing plate, and the pressing plate is fixed by the nut tightened on the guide bar.
The transverse direction loading device includes the first column, lifting gear and confined pressure loading device, and the one of first column
A facade is equipped with the lifting gear that can be lifted, and level is equipped with confined pressure loading device on the lifting gear.
The lifting gear includes guide rail, sliding block, bearing platform and vertical drive, equipped with can be along leading on the guide rail
The sliding block that rail slides up and down, bearing platform is fixed with the sliding block, vertical drive is equipped with below the bearing platform.
The cross section of the bearing platform is L-shaped.
The confined pressure loading device includes confined pressure sensor, confined pressure driving device, confined pressure connecting rod and confined pressure load plate, institute
The one end for stating confined pressure sensor is fixed on lifting gear, and the other end is connected with one end of confined pressure driving device, and the confined pressure is driven
The other end of dynamic device is connected with one end of confined pressure connecting rod, and the other end of the confined pressure connecting rod is fixed with confined pressure load plate,
The confined pressure sensor, confined pressure driving device and confined pressure connecting rod are coaxial.
The confined pressure load plate is circular arc type semicircular plate.
The vertical loading device includes top pressure driving device, top pressure sensor and balance bottom plate, the top pressure sensor
It is fixed on reaction frame, the top of the level pressure driving device is connected with top pressure sensor, and bottom is connected with pressure-bearing device, described
The lower section of pressure-bearing device is equipped with balance bottom plate.
The reaction frame is by two the second columns being arranged in parallel vertically and the crossbeam group for connecting two the second column tops
Into, the crossbeam bottom surface center to having top pressure driving device.
The vertical drive, confined pressure driving device and top pressure driving device are cylinder, hydraulic cylinder or jack.
Using a kind of measurement construction material test method of the experimental rig of compression strength and method under confined pressure, including with
Lower step：
(1) integrality of each component of checkout facility device and flexibility, it is ensured that experimental rig being capable of normal operation；
(2) vertical drive is adjusted, bearing platform is moved up and down, until confined pressure load plate is corresponding with specimen height, and
Confined pressure driving device is adjusted, applies the lateral load of setting to sample；
(3) keep the lateral load of sample constant, adjustment top pressure driving device applies vertical load to sample, when sample is broken
Bad when, records maximum vertical load；
(4) sample is replaced, changes lateral load numerical value, repeat step (2)~(3)；
(5) draw Mohr's circle, and draw out the tangent line of Mohr's circle, obtain the C values of sample withValue.
Beneficial effects of the present invention are：
(1) present invention can load confined pressure load and vertical load to sample at the same time, can realize under different confined pressure loads
The maximum compressive strength of sample；
(2) the configuration of the present invention is simple, design are reasonable, using the teaching of the invention it is possible to provide accurate experimental data.
Brief description of the drawings
Fig. 1 is overall structure diagram of the present invention；
Fig. 2 is the horizontal loading device schematic diagram of the present invention；
Fig. 3 is vertical loading device schematic diagram of the present invention；
Fig. 4 is pressure-bearing device schematic diagram of the present invention；
Wherein, 1, base, 2, vertical loading device, 3, horizontal loading device, the 4, first column, 5, guide rail, 6, sliding block, 7,
Bearing platform, 8, micro-pressure sensor, 9, confined pressure driving device, 10, confined pressure connecting rod, 11, confined pressure load plate, 12, vertical driving dress
Put, the 13, second column, 14, crossbeam, 15, top pressure driving device, 16, pressure-bearing device, 17, balance bottom plate, 161, upper pressure-bearing dress
Put, 162, lower pressure-bearing device, 163, guide rod, 164, spring, 165, hemispherical support.
Embodiment：
The invention will be further described with embodiment below in conjunction with the accompanying drawings.
As shown in Figure 1, a kind of experimental rig for measuring construction material compression strength under confined pressure, including base 1, counter-force
Frame, vertical loading device 2 and horizontal loading device 3, the reaction frame are arranged on the middle part of base 1, the both sides pair of the reaction frame
Claim to be equipped with horizontal loading device 3.The reaction frame is stood by two the second columns 13 being arranged in parallel vertically and connection two second
The crossbeam 14 on 13 top of column forms, the center of 14 bottom surface of crossbeam to having top pressure driving device 15, the reaction frame
To vertical loading device 2 is had on crossbeam 14,2 bottom of vertical loading device is connected with pressure-bearing device 16, two transverse directions
Loading device 3, which is symmetrical arranged, can play base 1 certain balanced action, center of gravity in whole equipment is located at the center of base 1,
Vertical loading device 2 is used for the load for applying vertical direction to sample；Horizontal loading device 3 has two, is separately positioned on vertical
The both sides of loading device 2, and be symmetrical set, it is further applied load to the both sides of sample, forms the confined pressure of sample.
As shown in Fig. 2, the transverse direction loading device 3 includes the first column 4, lifting gear and confined pressure loading device, it is described
One facade of the first column 4 is equipped with the lifting gear that can be lifted, and the horizontal confined pressure that is equipped with loads dress on the lifting gear
Put.The lifting gear includes guide rail 5, sliding block 6, bearing platform 7 and vertical drive 12, equipped with being capable of edge on the guide rail 5
The sliding block 6 that guide rail 5 slides up and down, bearing platform 7 is fixed with the sliding block 6, and the lower section of bearing platform 7 is equipped with vertical drive
12.The cross section of the bearing platform 7 is L-shaped.The confined pressure loading device includes confined pressure sensor 8, confined pressure driving device 9, encloses
Pressure connecting rod 10 and confined pressure load plate 11, one end of the confined pressure sensor 8 are fixed on lifting gear, and the other end drives with confined pressure
One end connection of dynamic device 9, the other end of the confined pressure driving device 9 are connected with one end of confined pressure connecting rod 10, the confined pressure
The other end of connecting rod 10 is fixed with confined pressure load plate 11, the confined pressure sensor 8, confined pressure driving device 9 and confined pressure connecting rod
10 is coaxial.The confined pressure load plate 11 is circular arc type semicircular plate.Specifically, in use, start vertical drive
12, the weighing unit for making to be installed on sliding block 6 is moved along guide rail 5, realizes the lifting of confined pressure loading device, to adjust confined pressure loading
The upper-lower position of device, after the upper-lower position for having adjusted confined pressure loading device, starts confined pressure driving device 9, makes confined pressure load plate
11 pairs of samples carry out confined pressure loading, when confined pressure sensor 8 reaches setting load, confined pressure driving device 9 is stopped loading.
As shown in figure 3, the vertical loading device 2 includes top pressure driving device 15, top pressure sensor and balance bottom plate 17,
The top pressure sensor is fixed on reaction frame, and the top of the top pressure driving device 15 is connected with top pressure sensor, bottom with
Pressure-bearing device 16 connects, and the lower section of the pressure-bearing device 16 is equipped with balance bottom plate 17.Balance bottom plate 17 is located at the upper table of base 1
Face, position is in the underface of pressure-bearing device 16, as shown in figure 4, the pressure-bearing device 16 includes upper pressure-bearing device 161 and lower pressure-bearing
Device 162, between the upper pressure-bearing device 161 and lower pressure-bearing device 162 center be equipped with hemispherical support 165, it is described on
Pressure-bearing device 161 and lower pressure-bearing device 162 are connected by the guide rod 163 on lower 162 top surface of pressure-bearing device, four angles,
The guide rod 163 passes through upper pressure-bearing device 161, and is set with spring 164 in the upper section of upper pressure-bearing device 161, described
The top of spring 164 is equipped with pressing plate, and the pressing plate is fixed by the nut being tightened on guide rod 163.After selected confined pressure payload values,
Start top pressure driving device 15 and vertical direction loading load is carried out to sample, until sample is destroyed, when record sample destroys
Maximum.
The vertical drive 12, confined pressure driving device 9 and top pressure driving device 15 are cylinder, hydraulic cylinder or very heavy
Push up, jack is used in the present embodiment, larger load can be provided sample.
Using a kind of measurement construction material test method of the experimental rig of compression strength and method under confined pressure, including with
Lower step：
(1) integrality of each component of checkout facility device and flexibility, it is ensured that experimental rig being capable of normal operation；
(2) vertical drive 12 is adjusted, bearing platform 7 is moved up and down, until confined pressure load plate 11 and specimen height pair
Should, and confined pressure driving device 9 is adjusted, apply the lateral load of setting to sample；
(3) keep the lateral load of sample constant, adjustment top pressure driving device 15 applies vertical load to sample, works as sample
Maximum vertical load is recorded during destruction；
(4) sample is replaced, changes lateral load numerical value, repeat step (2)~(3)；
(5) draw Mohr's circle, and draw out the tangent line of Mohr's circle, obtain the C values of sample withValue.
Although above-mentioned be described the embodiment of the present invention with reference to attached drawing, model not is protected to the present invention
The limitation enclosed, those skilled in the art should understand that, on the basis of technical scheme, those skilled in the art are not
Need to make the creative labor the various modifications that can be made or deformation still within protection scope of the present invention.
Claims (9)
1. a kind of experimental rig for measuring construction material compression strength under confined pressure, it is characterized in that：Including base, reaction frame, erect
To loading device and horizontal loading device, the reaction frame is arranged on the middle of the base, and the both sides of the reaction frame are arranged with horizontal stroke
To loading device, the transverse direction loading device includes the first column, lifting gear and confined pressure loading device, first column
One facade is equipped with the lifting gear that can be lifted, and level is equipped with confined pressure loading device, the counter-force on the lifting gear
To vertical loading device is had on the crossbeam of frame, the vertical loading device bottom is connected with pressure-bearing device, the pressure-bearing dress
Put including upper pressure-bearing device and lower pressure-bearing device, center is equipped with hemispherical between the upper pressure-bearing device and lower pressure-bearing device
Support, the upper pressure-bearing device are connected with lower pressure-bearing device by the guide rod on lower four angles of pressure-bearing device top surface,
The guide rod passes through upper pressure-bearing device, and is set with spring in the upper section of upper pressure-bearing device, and the spring top is equipped with
Pressing plate, the pressing plate are fixed by the nut tightened on the guide bar；
The vertical loading device, which includes top pressure driving device, top pressure sensor and balance bottom plate, the top pressure sensor, to be fixed
On reaction frame, the top of the top pressure driving device is connected with top pressure sensor, and bottom is connected with pressure-bearing device, the pressure-bearing
The lower section of device is equipped with balance bottom plate.
2. a kind of experimental rig for measuring construction material compression strength under confined pressure as claimed in claim 1, it is characterized in that：Institute
Stating lifting gear includes guide rail, sliding block, bearing platform and vertical drive, equipped with can be slided up and down along guide rail on the guide rail
Sliding block, bearing platform is fixed with the sliding block, vertical drive is equipped with below the bearing platform.
3. a kind of experimental rig for measuring construction material compression strength under confined pressure as claimed in claim 2, it is characterized in that：Institute
The cross section for stating bearing platform is L-shaped.
4. a kind of experimental rig for measuring construction material compression strength under confined pressure as claimed in claim 1, it is characterized in that：Institute
Stating confined pressure loading device includes confined pressure sensor, confined pressure driving device, confined pressure connecting rod and confined pressure load plate, the confined pressure sensing
One end of device is fixed on lifting gear, and the other end is connected with one end of confined pressure driving device, the confined pressure driving device it is another
One end is connected with one end of confined pressure connecting rod, and the other end of the confined pressure connecting rod is fixed with confined pressure load plate, and the confined pressure passes
Sensor, confined pressure driving device and confined pressure connecting rod are coaxial.
5. a kind of experimental rig for measuring construction material compression strength under confined pressure as claimed in claim 4, it is characterized in that：Institute
It is circular arc type semicircular plate to state confined pressure load plate.
6. a kind of experimental rig for measuring construction material compression strength under confined pressure as claimed in claim 1, it is characterized in that：Institute
State reaction frame to be made of the crossbeam of two the second column tops of two the second columns being arranged in parallel vertically and connection, the crossbeam
The center of bottom surface is to having top pressure driving device.
7. a kind of experimental rig for measuring construction material compression strength under confined pressure as claimed in claim 2, it is characterized in that：Institute
It is cylinder, hydraulic cylinder or jack to state vertical drive.
8. a kind of experimental rig for measuring construction material compression strength under confined pressure as claimed in claim 4, it is characterized in that：Institute
It is cylinder, hydraulic cylinder or jack to state confined pressure driving device.
9. usage right requires a kind of measurement construction material experimental rig of compression strength under confined pressure of 1-8 any one of them
Test method, it is characterized in that, comprise the following steps：
(1) integrality of each component of checkout facility device and flexibility, it is ensured that experimental rig being capable of normal operation；
(2) vertical drive is adjusted, bearing platform is moved up and down, until confined pressure load plate is corresponding with specimen height, and is adjusted
Confined pressure driving device, applies the lateral load of setting to sample；
(3) keep the lateral load of sample constant, adjustment top pressure driving device applies vertical load to sample, when sample destroys
Record maximum vertical load；
(4) sample is replaced, changes lateral load numerical value, repeat step (2)~(3)；
(5) Mohr's circle is drawn, and draws out the tangent line of Mohr's circle, obtains the cohesive strength C values and internal friction angle of sampleValue.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610251343.4A CN105699203B (en) | 2016-04-21 | 2016-04-21 | A kind of experimental rig and method for measuring construction material compression strength under confined pressure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610251343.4A CN105699203B (en) | 2016-04-21 | 2016-04-21 | A kind of experimental rig and method for measuring construction material compression strength under confined pressure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105699203A CN105699203A (en) | 2016-06-22 |
| CN105699203B true CN105699203B (en) | 2018-05-15 |
Family
ID=56216297
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610251343.4A Active CN105699203B (en) | 2016-04-21 | 2016-04-21 | A kind of experimental rig and method for measuring construction material compression strength under confined pressure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105699203B (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106128259B (en) * | 2016-07-08 | 2018-08-31 | 山东科技大学 | A kind of equivalent material simulating tomography experimental rig and test method |
| CN107014674A (en) * | 2017-06-12 | 2017-08-04 | 福建工程学院 | The loading device and loading method of Geotechnical Engineering model test |
| CN112112153B (en) * | 2019-06-19 | 2022-02-15 | 沈军 | Efficient construction method for segmental pile |
| CN111398043A (en) * | 2020-04-10 | 2020-07-10 | 重庆小马智诚科技有限责任公司 | Bulk waste rock compression test device |
| CN111398025A (en) * | 2020-04-20 | 2020-07-10 | 太原理工大学 | Confining pressure loading device for drop hammer impact test |
| CN112268786B (en) * | 2020-11-03 | 2023-03-24 | 青岛理工大学 | Rock-like material bidirectional pressure test device and working method |
| CN115111482B (en) * | 2022-06-27 | 2023-07-11 | 江苏省特种设备安全监督检验研究院 | Pressure-bearing device based on image analysis and use method |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3797303A (en) * | 1971-11-29 | 1974-03-19 | Anvar | Biaxial compression-testing machine |
| SU1113472A1 (en) * | 1983-06-07 | 1984-09-15 | Специальное Конструкторско-Технологическое Бюро (Сктб) Главного Управления По Строительству Байкало-Амурской Магистрали | Device for determining degree of soil compaction |
| CN102253183A (en) * | 2011-06-28 | 2011-11-23 | 山东科技大学 | Shear-seepage coupling test system for rock cracks under action of confining pressure |
| CN202886203U (en) * | 2012-10-25 | 2013-04-17 | 马鞍山十七冶工程科技有限责任公司 | Small-tonnage low-speed loading device for beam bending resistance test |
| CN103175728A (en) * | 2013-02-07 | 2013-06-26 | 西安理工大学 | Dynamic true-triaxial apparatus for soil |
| CN104062182A (en) * | 2014-05-16 | 2014-09-24 | 山东科技大学 | Testing system for evolution process of deep mining stress field |
| CN205506574U (en) * | 2016-04-21 | 2016-08-24 | 山东大学 | Measure building material compressive strength's under confined pressure test device |
-
2016
- 2016-04-21 CN CN201610251343.4A patent/CN105699203B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3797303A (en) * | 1971-11-29 | 1974-03-19 | Anvar | Biaxial compression-testing machine |
| SU1113472A1 (en) * | 1983-06-07 | 1984-09-15 | Специальное Конструкторско-Технологическое Бюро (Сктб) Главного Управления По Строительству Байкало-Амурской Магистрали | Device for determining degree of soil compaction |
| CN102253183A (en) * | 2011-06-28 | 2011-11-23 | 山东科技大学 | Shear-seepage coupling test system for rock cracks under action of confining pressure |
| CN202886203U (en) * | 2012-10-25 | 2013-04-17 | 马鞍山十七冶工程科技有限责任公司 | Small-tonnage low-speed loading device for beam bending resistance test |
| CN103175728A (en) * | 2013-02-07 | 2013-06-26 | 西安理工大学 | Dynamic true-triaxial apparatus for soil |
| CN104062182A (en) * | 2014-05-16 | 2014-09-24 | 山东科技大学 | Testing system for evolution process of deep mining stress field |
| CN205506574U (en) * | 2016-04-21 | 2016-08-24 | 山东大学 | Measure building material compressive strength's under confined pressure test device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105699203A (en) | 2016-06-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105699203B (en) | A kind of experimental rig and method for measuring construction material compression strength under confined pressure | |
| US11359999B2 (en) | Experimental platform and experimental method for simulating coal rock disaster of coal mine stope | |
| CN105938070A (en) | Multifunctional true triaxial rock drilling test system and test method for characterizing the characteristics of rocks | |
| CN207051095U (en) | Automatic centering load maintainer under a kind of triaxial stress | |
| CN202836997U (en) | Movable jack calibrating device | |
| CN105887946B (en) | A kind of laboratory testing rig of Model Pile Combined load | |
| CN107036835A (en) | It is a kind of to simulate the plane double shaft load test method and device that two steps exploitation obturation interacts with ore pillar | |
| CN206223564U (en) | A kind of fixed loading device based on side slope | |
| CN205642868U (en) | Two -way load combined action capability test device of herringbone post node | |
| CN106198237A (en) | A kind of concrete segment pressure testing machine | |
| CN106706343A (en) | Radial and axial rigidity testing method and radial and axial rigidity testing fixture for elastic wheel | |
| CN107907286A (en) | A kind of new unsymmetrial loading tunnel Research on Shaking Table for Simulating system | |
| CN202939101U (en) | Direct shearing instrument device with multi-layer shearing function | |
| CN206862748U (en) | Simulate the experimental provision of tunnel stress characteristics at tomography | |
| CN105300811A (en) | Large-size soil circular shear testing machine | |
| CN203455183U (en) | Reaction frame platform with movable bottom backing plate | |
| CN108051304A (en) | A kind of experimental provision and experimental method at multifunction three-dimensional visual structure interface | |
| CN205506574U (en) | Measure building material compressive strength's under confined pressure test device | |
| CN205839819U (en) | A kind of loading connecting structure for spread foundation full scale test | |
| CN207742047U (en) | A kind of portable shear of rock strength testing device | |
| CN206300850U (en) | A kind of telescopic shear box three dimension stress direct shear apparatus of ring | |
| CN207036452U (en) | A kind of traditional style construction steel frame structure bidirectional load test device | |
| CN206891746U (en) | A kind of Novel jack calibrating installation | |
| CN205562286U (en) | Hoist girder test device | |
| CN106768852A (en) | Compensation of undulation experimental provision and system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |