CN107796714A - Simulate the asphalt mixture shearing strength tester of actual wheel load - Google Patents
Simulate the asphalt mixture shearing strength tester of actual wheel load Download PDFInfo
- Publication number
- CN107796714A CN107796714A CN201711219294.7A CN201711219294A CN107796714A CN 107796714 A CN107796714 A CN 107796714A CN 201711219294 A CN201711219294 A CN 201711219294A CN 107796714 A CN107796714 A CN 107796714A
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- CN
- China
- Prior art keywords
- environmental cabinet
- asphalt mixture
- shearing strength
- cushion cap
- wheel
- 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.)
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Classifications
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- 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
- G01N3/24—Investigating strength properties of solid materials by application of mechanical stress by applying steady shearing forces
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D27/00—Simultaneous control of variables covered by two or more of main groups G05D1/00 - G05D25/00
- G05D27/02—Simultaneous control of variables covered by two or more of main groups G05D1/00 - G05D25/00 characterised by the use of electric 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
- G01N2203/0025—Shearing
-
- 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
- G01N2203/022—Environment of the test
- G01N2203/0222—Temperature
- G01N2203/0226—High temperature; Heating means
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The present invention relates to a kind of asphalt mixture shearing strength tester for simulating actual wheel load, environmental cabinet including being provided with heater, loading wheel and die trial cushion cap are provided with environmental cabinet, loading wheel is connected to drive loading wheel to treat test block application pressure and the first power set moved back and forth in the horizontal direction by connecting rod, and loading wheel is located above die trial cushion cap；Temperature sensor is installed in environmental cabinet, displacement transducer and force snesor are installed on connecting rod, temperature sensor, displacement transducer and force snesor are all connected with control panel.Present invention varying environment temperature required when can be with regulation experiment, actual wheel load can be simulated, carry out asphalt mixture shearing strength test.The present invention can carry out asphalt shear strength test in the case of effectively simulation actual environment temperature and road surface dynamic load, be consistent with actual conditions, accuracy is high.
Description
Technical field
The invention belongs to asphalt mixture shearing intensity device technical field, is related to a kind of drip for simulating actual wheel load
Blue or green mixture shearing strength tester.
Background technology
In recent years, China's highway cause fast development, huge achievement is achieved.At present, the high-grade public affairs in China
Road generally uses Semi rigid bituminous surface structure, and this pavement structure is the construction for the high-grade highway that China adapts to Heavy Traffic
Significant contribution is made that with development.However, semi-rigid asphalt pavement generally existing early damage phenomenon, to this domestic and international
Person has carried out substantial amounts of investigation.Research shows that inter-laminar shear failure is to cause one of key factor of road surface breakage.Interlayer shear
Cause that Assessment of Serviceability of Roads degradation can be made after interlayer slip, the serious curtailment service life of road.Asphalt mixture is made
For a kind of response to temperature material, its performance and environment temperature are closely related.Therefore, pitch under different temperatures can be measured by being badly in need of one kind
The equipment of compound anti-shear performance, performance is cut preferably to embody asphalt shearing strength at intersection.
Asphalt mixture shearing strength tester, it is the anti-shearing strong indispensable equipment of measurement asphalt, it is convenient
Fast.
At present, asphalt mixture shearing strength tester has the following disadvantages：
When the first, applying side pressure to test specimen, using static loading mode, this is not inconsistent with actual conditions；
2nd, the influence of Temperature on Asphalt Mixture performance is not considered, and experimental result is relevant with ambient temperature during experiment, obtains
Data there is very big uncertainty；
3rd, tested using circular test specimen, it is impossible to reflect the force-bearing situation of pavement structure well；
When the 4th, applying side load, active area is unique, without representativeness.
The content of the invention
It is an object of the invention to overcome problems of the prior art, there is provided a kind of drip for simulating actual wheel load
Blue or green mixture shearing strength tester, dynamic load can be applied, simulate actual wheel load, it is anti-shearing strong to complete asphalt
Degree test.
In order to achieve the above object, the present invention adopts the following technical scheme that：
Environmental cabinet including being provided with heater, loading wheel and die trial cushion cap are provided with environmental cabinet, load wheel
It is connected to drive loading wheel to treat test block application pressure and move back and forth in the horizontal direction first by connecting rod
Power set, loading wheel are located above die trial cushion cap；
Temperature sensor is installed in environmental cabinet, displacement transducer and force snesor are installed on connecting rod, temperature passes
Sensor, displacement transducer and force snesor are all connected with control panel.
Further, environmental cabinet contains inner and outer wall, heater include the outer wall for being arranged on environmental cabinet and inwall it
Between heating wire.
Further, the heat shield panel that the inwall use of environmental cabinet can dismantle, outer wall use stainless steel material；In environmental cabinet
Heat preserving and insulating material is set between outer wall and inwall.
Further, the bottom of environmental cabinet is provided with four wheels and four support bases.
Further, loading wheel is connected by connecting rod and conduit with the first power set, interior at the top of environmental cabinet
Side is provided with the first horizontal slide rail, and the first slide rail connects wheel boatswain chair by pulley, and connecting rod is vertically arranged and passes through car
Take turns boatswain chair.
Further, load between wheel and connecting rod as threaded connection.
Further, die trial cushion cap is arranged in environmental cabinet by pulley and the second horizontal slide rail, and die trial cushion cap passes through
Transmission rod is connected to the second power set for driving die trial cushion cap to slidably reciprocate in the horizontal direction, is opened up in the side wall of environmental cabinet
There is the through hole skidded off for die trial cushion cap；Location nut is provided with the side wall of die trial cushion cap.
Further, environmental cabinet offers the side wall of through hole and is provided with the door with windowpane.
Further, the first power set and the second power set use servo-type hydraulic press.
Further, test specimen to be measured is cuboid.
Compared with prior art, the present invention has technique effect beneficial below：
The present invention is by increasing the environmental cabinet with heater, required varying environment temperature when can be with regulation experiment；
Meanwhile by setting loading wheel and die trial cushion cap, actual wheel load can be simulated, carry out asphalt mixture shearing intensity survey
Examination；Different loading types is controlled by setting displacement transducer, force snesor and control panel, wherein, force snesor
Dynamic load confining pressure suffered by test specimen to be measured can be obtained, displacement transducer can obtain the change in displacement of loading wheel, reach and cut
The size of load and the size control of displacement are cut, so as to control different loading types, such as strain or iso-stress loading.This hair
It is bright to carry out asphalt shear strength test in the case of effectively simulation actual environment temperature and road surface dynamic load, with reality
Border situation is consistent, and accuracy is high.
Further, the heat shield panel that environment chamber interior wall use of the present invention can dismantle, reduce what may be dropped in experimentation
Test pollution of the residue to heating wire；Outer wall uses stainless steel material, plays a part of supporting box, and closed environment case；It is logical
Setting heat preserving and insulating material is crossed, prevents temperature from leaking, improves heating rate.
Further, the present invention sets wheel and support base at the angle of the bottom surface of environmental cabinet four, is easy to the carrying of instrument, and
During standing, retractable wheels, support base is put down, reduce the damage of wheel, and prevent that instrument installation is unstable.
Further, the present invention applies side pressure by using the loading wheel that can be changed, and can apply different contacts area
Actual driving wheel carry, and dynamic load speed is controllable.
Further, the present invention skids off die trial cushion cap, facilitates being put into and taking for test specimen by setting the second slide rail
Go out, experimenter can be avoided to be burned due to the object accidentally encountered in environmental cabinet.
Further, the present invention is provided with the door with windowpane, is easy to sealed environment case and can be with Real Time Observation experimentation
Various situations.
Further, the present invention uses the test specimen to be measured of cuboid, can reflect the force-bearing situation of pavement structure well.
Brief description of the drawings
Fig. 1 is the general structure schematic diagram of the present invention.
Fig. 2 (a) is the side-pressing device schematic diagram of the present invention, and Fig. 2 (b) is the side view of side-pressing device.
Fig. 3 is the control panel schematic diagram of the present invention.
Fig. 4 (a) is the schematic diagram of the door of the invention with windowpane, and Fig. 4 (b) is the schematic diagram of die trial cushion cap.
Fig. 5 is the heating wire distribution map of the present invention.
Fig. 6 is the circuit controling drawing of the present invention.
Wherein 1 environmental cabinet, 2 loading wheels, 3 wheel boatswain chairs, 4 transmission rods, 5 second slide rails, 6 heating wire, 7 TEMPs
Device, 8 displacement transducers, 9 force snesors, 10 servo-type hydraulic presses, 11 die trial cushion caps, 12 control panels, 13 location nuts, 14 bands
The door of windowpane, 15 support bases, 16 wheels, 17 conduits, 18 connecting rods, 19 wires.
Embodiment
The present invention is described in further details below in conjunction with the accompanying drawings.
With reference to figure 1, the present invention includes environmental cabinet 1, replaceable loading wheel 2, wheel boatswain chair 3, transmission rod 4, first and slided
Rail, the second slide rail 5, heating wire 6, temperature sensor 7, displacement transducer 8, force snesor 9, servo-type hydraulic press around four walls
10th, die trial cushion cap 11, control panel 12, location nut 13,14, four, door support base 15, four wheel 16 with windowpane,
More conduits 17, connecting rod 18, multiple conducting wires 19.
Four wheels 16 are located at four angles of the bottom of environmental cabinet 1 respectively, when needing to move instrument, play and reduce friction
Effect；Four support bases 15 positioned at the outside of four wheels 16, play a part of retainer instrument, avoid instrument slips from making respectively
Into destruction.
Environmental cabinet 1 includes inwall and outer wall, and inwall uses detachable heat shield panel, reduces the reality that may be dropped in experimentation
Pollution of the check-fault slag to heating wire.Outer wall uses stainless steel material, plays a part of supporting box, and closed environment case 1.
Wheel boatswain chair 3 is horizontally disposed and is located at the inner top of environmental cabinet 1, and wheel boatswain chair 3 is slided by pulley and horizontal first
The madial wall of rail JA(junction ambient) case 1, loading wheel 2 are connected by connecting rod 18 and conduit 17 with the first power set, connecting rod
Part 18 is vertically arranged and passes through wheel boatswain chair 3, and the first power set are located at the outside of environmental cabinet 1, are applied to controlled loading wheel 2
Pressure on test specimen, to simulate pressure of the actual vehicle load action to road surface, and the first power set can drive and add
Carrier vehicle wheel 2 moves back and forth in the horizontal direction.
Die trial cushion cap 11 is positioned at the lower section of loading wheel 2；Location nut 13 is located at the right side two-end-point position of die trial cushion cap 11
Place, plays a part of fixed test specimen, avoids test specimen from producing displacement in the presence of dynamic horizontal pressure；Transmission rod 4 is located at die trial cushion cap
11 right sides are simultaneously connected with the second power set, and servo-type hydraulic press 10 is connected, and die trial cushion cap 11 passes through pulley and horizontal second
Slide rail 5 is arranged in environmental cabinet 1, and the through hole skidded off for die trial cushion cap 11 is offered in the side wall of environmental cabinet 1, dynamic by second
Power apparatus and transmission rod 4, can drive die trial cushion cap 11 to skid off environmental cabinet 1, be easy to being put into for test specimen；Enter completely in die trial cushion cap 11
After entering environmental cabinet 1, the side wall of die trial cushion cap 11 and the side wall of environmental cabinet 1 flush, and in the side for the environmental cabinet 1 for offering through hole
Wall is provided with the door 14 with windowpane.First power set and the second power set use servo-type hydraulic press 10.
Referring to Fig. 2 (a) and Fig. 2 (b), loading wheel 2 can be changed, and the representative car in different regions is respectively adopted
Wheel, in the hope of simulating most real road surface working condition.
Referring to Fig. 3, there are wheel rising switch, power switch, wheel velocity switch, side pressure on control panel 12 of the invention
Size switch, iso-stress loaded switches and strain loading is waited to switch, also temperature display, side pressure display screen and shearing display
Screen, and temp control switch, side pressure controlling switch and shearing controlling switch are correspondingly arranged in each display screen side.
Referring to Fig. 4 (a), the door 14 with windowpane is provided with the side wall of environmental cabinet 1, loading wheel 2 is conveniently replaceable, places
Test specimen and the sealed environment case in test, and can be with the various situations in Real Time Observation experimentation.Test specimen to be measured is rectangular
The bodily form.Referring to Fig. 4 (b), die trial cushion cap 11 is rectangle drawer-type structure, is easy to place test specimen to be measured.
Referring to Fig. 5, heating wire 6 is between environment chamber interior wall and environment box outer wall, and heating wire 6 is evenly distributed on both sides
In wallboard and bottom surface wallboard, to reach the effect uniformly heated.Heat preserving and insulating material can be set between outer wall and inwall, prevent
Temperature leaks, and improves heating rate.
Temperature sensor 7 is located at the upper right side of die trial cushion cap 11；Displacement transducer 8 and force snesor 9 and the phase of connecting rod 18
Even, to control the size of shear stress；Temperature sensor 7, displacement transducer 8 and force snesor 9 are in environmental cabinet 1, control
Panel 12 processed is located at the outside of environmental cabinet 1 and is connected by wire 19 with temperature sensor 7, displacement transducer 8 and force snesor 9,
To reach temperature, load and the adjustment of displacement and setting, as shown in Figure 6.
The present invention use process be：Switch on power, open the door 14 with windowpane, it is suitable by requirement of experiment, selection
Loading wheel 2, after replacing, die trial cushion cap 11 is pulled out by the second slide rail 5, test specimen is put into die trial cushion cap 11, and
Test specimen is securely fixed by location nut 13, in order to avoid produce unnecessary displacement, then by die trial cushion cap 11 along the second slide rail 5
Slide into, shut the door 14 with windowpane, by control panel 12 carry out test parameters setting, select suitable experimental temperature,
Wheel load, the speed and shearing force loading type for loading wheel.Finally, the start button clicked on control panel 12 is carried out
Experiment.
The present invention can be controlled experimental situation, heated using the environmental cabinet 1 for including heating wire 6, make experiment
When environment reach temperature needed for experimenter.By the way that actual road surface stress can be simulated with the loading wheel 2 of re-type
Situation, and loading wheel 2 is further applied load using the first power set, there is provided required shearing force is tested, passes through the first power
Device, the slide rail of wheel boatswain chair 3 and first are engaged, and drive the loading level of wheel 2 to slidably reciprocate, so as to reach application live load
The purpose of load.The speed of dynamic load can also be controlled and be adjusted according to actual conditions.Pass through connecting rod 18 and servo
Formula hydraulic press 10, is loaded in different forms.Pitch in the case of actual environment temperature and road surface dynamic load can be simulated by being finally reached
The purpose of compound shear strength.
Have displacement transducer 8 and force snesor 9 on connecting rod 18 simultaneously, control the change in experimentation in real time
Change.The heating wire 6 of heating is provided with the double-deck clamping plate of environmental cabinet 1, and temperature is regulated and controled according to temperature sensor 7.
Die trial cushion cap 11 has the second slide rail 5 so that die trial cushion cap 11 can skid off along track, be easy to being put into and taking out for test specimen.
Test specimen can be fixed on the position specified by the location nut 13 positioned at the right side of die trial cushion cap 11, in order to avoid applied above test specimen
Side dynamic load pressure makes test specimen produce unnecessary movement.
Invention increases environmental cabinet 1, required varying environment temperature when can be with regulation experiment, while simulate actual wheel
Load, carry out asphalt mixture shearing strength test.Meanwhile the connecting rod 18 of side application shearing force can pass through sensor
And control panel controls different loading types：Deng strain or iso-stress loading.
Claims (10)
- A kind of 1. asphalt mixture shearing strength tester for simulating actual wheel load, it is characterised in that：Add including being provided with The environmental cabinet (1) of thermal, environmental cabinet (1) is interior to be provided with loading wheel (2) and die trial cushion cap (11), and loading wheel (2) passes through Connecting rod (18), which is connected to drive loading wheel (2) to treat test block, applies pressure and move back and forth in the horizontal direction the One power set, loading wheel (2) are located above die trial cushion cap (11)；Temperature sensor (7) is installed in environmental cabinet (1), displacement transducer (8) and power sensing are installed on connecting rod (18) Device (9), temperature sensor (7), displacement transducer (8) and force snesor (9) are all connected with control panel (12).
- 2. a kind of asphalt mixture shearing strength tester for simulating actual wheel load according to claim 1, it is special Sign is：Environmental cabinet (1) contains inner and outer wall, and heater includes being arranged between the outer wall and inwall of environmental cabinet (1) Heating wire (6).
- 3. a kind of asphalt mixture shearing strength tester for simulating actual wheel load according to claim 2, it is special Sign is：The heat shield panel that the inwall use of environmental cabinet (1) can dismantle, outer wall use stainless steel material；In environmental cabinet (1) outer wall Heat preserving and insulating material is set between inwall.
- 4. a kind of asphalt mixture shearing strength tester for simulating actual wheel load according to claim 1, it is special Sign is：The bottom of environmental cabinet (1) is provided with four wheels (16) and four support bases (15).
- 5. a kind of asphalt mixture shearing strength tester for simulating actual wheel load according to claim 1, it is special Sign is：Loading wheel (2) is connected by connecting rod (18) and conduit (17) with the first power set, is pushed up in environmental cabinet (1) The first horizontal slide rail is installed, the first slide rail connects wheel boatswain chair (3) by pulley, and connecting rod (18) is set vertically on the inside of portion Put and pass through wheel boatswain chair (3).
- 6. a kind of asphalt mixture shearing strength tester for simulating actual wheel load according to claim 1, it is special Sign is：Load between wheel (2) and connecting rod (18) as threaded connection.
- 7. a kind of asphalt mixture shearing strength tester for simulating actual wheel load according to claim 1, it is special Sign is：Die trial cushion cap (11) is arranged in environmental cabinet (1) by pulley and horizontal the second slide rail (5), die trial cushion cap (11) The second power set for being connected to drive die trial cushion cap (11) to slidably reciprocate in the horizontal direction by transmission rod (4), environmental cabinet (1) through hole skidded off for die trial cushion cap (11) is offered in side wall；Positioning spiral shell is provided with the side wall of die trial cushion cap (11) Female (13).
- 8. a kind of asphalt mixture shearing strength tester for simulating actual wheel load according to claim 7, it is special Sign is：The side wall that environmental cabinet (1) offers through hole is provided with the door (14) with windowpane.
- 9. a kind of asphalt mixture shearing strength tester for simulating actual wheel load according to claim 7, it is special Sign is：First power set and the second power set use servo-type hydraulic press (10).
- 10. a kind of asphalt mixture shearing strength tester for simulating actual wheel load according to claim 1, it is special Sign is：Test specimen to be measured is cuboid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711219294.7A CN107796714A (en) | 2017-11-28 | 2017-11-28 | Simulate the asphalt mixture shearing strength tester of actual wheel load |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711219294.7A CN107796714A (en) | 2017-11-28 | 2017-11-28 | Simulate the asphalt mixture shearing strength tester of actual wheel load |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107796714A true CN107796714A (en) | 2018-03-13 |
Family
ID=61536969
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711219294.7A Pending CN107796714A (en) | 2017-11-28 | 2017-11-28 | Simulate the asphalt mixture shearing strength tester of actual wheel load |
Country Status (1)
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| CN (1) | CN107796714A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110411860A (en) * | 2019-07-04 | 2019-11-05 | 广州大学 | Shearing test device and test method between a kind of asphalt pavement structural layer |
| CN112177064A (en) * | 2020-10-29 | 2021-01-05 | 燕山大学 | Shear box device for simulating foundation pit wall soil interface |
| CN112393977A (en) * | 2019-08-15 | 2021-02-23 | 优苈国际有限公司 | Main shaft testing device |
| CN113899619A (en) * | 2021-11-15 | 2022-01-07 | 中国建筑材料科学研究总院有限公司 | Sheet ceramic impact strength testing device |
| CN117191599A (en) * | 2023-09-08 | 2023-12-08 | 山东时代应力工程技术有限公司 | Bridge pavement anti-damage force test equipment |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103091179A (en) * | 2013-01-10 | 2013-05-08 | 长安大学 | Interlamination shear-resisting track test mould of large longitudinal-slope asphalt pavement |
| CN203101383U (en) * | 2013-03-20 | 2013-07-31 | 长安大学 | Indoor wheel tracking test instrument |
| CN105784520A (en) * | 2016-04-25 | 2016-07-20 | 长安大学 | Indoor programmable asphalt mixture fatigue simulation test device |
-
2017
- 2017-11-28 CN CN201711219294.7A patent/CN107796714A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103091179A (en) * | 2013-01-10 | 2013-05-08 | 长安大学 | Interlamination shear-resisting track test mould of large longitudinal-slope asphalt pavement |
| CN203101383U (en) * | 2013-03-20 | 2013-07-31 | 长安大学 | Indoor wheel tracking test instrument |
| CN105784520A (en) * | 2016-04-25 | 2016-07-20 | 长安大学 | Indoor programmable asphalt mixture fatigue simulation test device |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110411860A (en) * | 2019-07-04 | 2019-11-05 | 广州大学 | Shearing test device and test method between a kind of asphalt pavement structural layer |
| CN110411860B (en) * | 2019-07-04 | 2022-05-10 | 广州大学 | Interlaminar shear test device and method for asphalt pavement structure |
| CN112393977A (en) * | 2019-08-15 | 2021-02-23 | 优苈国际有限公司 | Main shaft testing device |
| CN112177064A (en) * | 2020-10-29 | 2021-01-05 | 燕山大学 | Shear box device for simulating foundation pit wall soil interface |
| CN113899619A (en) * | 2021-11-15 | 2022-01-07 | 中国建筑材料科学研究总院有限公司 | Sheet ceramic impact strength testing device |
| CN117191599A (en) * | 2023-09-08 | 2023-12-08 | 山东时代应力工程技术有限公司 | Bridge pavement anti-damage force test equipment |
| CN117191599B (en) * | 2023-09-08 | 2024-03-29 | 山东时代应力工程技术有限公司 | Bridge pavement anti-damage force test equipment |
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Application publication date: 20180313 |