CN111721613A - Wind-blown sand anchor rod drawing test device and test method thereof - Google Patents
Wind-blown sand anchor rod drawing test device and test method thereof Download PDFInfo
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- CN111721613A CN111721613A CN202010497803.8A CN202010497803A CN111721613A CN 111721613 A CN111721613 A CN 111721613A CN 202010497803 A CN202010497803 A CN 202010497803A CN 111721613 A CN111721613 A CN 111721613A
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- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
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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
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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
- G01N3/08—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
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Abstract
The invention discloses a wind-blown sand anchor rod drawing test device and a test method thereof. The test method comprises the following steps: the dynamic pulling-out simulation device has the advantages that the dynamic pulling-out of the anchor rod can be realized, and the stress and deformation conditions of the anchor rod in the actual engineering can be reflected more truly.
Description
Technical Field
The invention belongs to the technical field of rock and soil anchoring engineering, and particularly relates to a wind-blown sand anchor rod drawing test device and a test method thereof.
Background
The density of railway networks in northwest areas of China is greatly increased nowadays, and newly repaired heavy haul railways inevitably cross deserts and gobi. Due to the fact that the mobility of sand in the Gobi area is large, key technologies such as hole forming and grouting in the traditional anchoring process are difficult to achieve, and meanwhile the effect of vibration load generated by a heavy-duty railway train on the anchoring performance of the anchor rod is very complex. The vibration load of the train generated in the process of passing through the heavy-duty train generates disturbance on the in-situ anchoring sandy soil body to change the state of the soil body on one hand and changes the anchoring mechanical action mechanism of the anchor rod on the other hand, thereby influencing the stability and the safety of the anchoring engineering.
In recent years, screw-in type anchor rods with enlarged heads are put into use in heavy haul railway construction, but in the existing anchor rod anchoring performance research of windy and sandy areas under heavy load railway train load, most of tests only pre-embed anchor rods into soil in advance and perform static anchor rod pulling and bearing characteristic tests on the soil. The disturbance of the construction process to the in-situ soil body and the influence of the vibration load of the heavy-duty train on the anchor rod and the soil body are not considered in the test process. With the continuous deepening of anchor rod anchoring performance research of a windy and sandy area under the load of a heavy haul railway train, the problem of vertical stress change borne by the anchor rod under the action of vibration load and construction effect is successively solved. Therefore, the traditional construction effect without considering the sand anchor rod is too conservative with the design of the anchoring scheme only considering the static load influence, and the test result is far from the significance of practical research.
In the actual anchoring engineering, the anchor rod is mainly fixed in sandy soil by a centrifugal screwing-in method, the construction effect generates disturbance on the in-situ soil body in the screwing-in process to change the stress and strain of the soil body and change the stress state of the anchor rod, when the anchor rod is under the action of vibration load, the original stress state of the anchor rod can be correspondingly changed, and meanwhile, additional deformation of the anchor rod can be caused. Under the influence of construction effect and train vibration load coupling effect, the stress of the anchor rod becomes very complex. Based on the method, the wind-blown sand anchor rod indoor drawing test method considering the construction effect and the vibration effect is provided.
Disclosure of Invention
The invention aims to provide a device and a method for testing the drawing of a drift sand anchor rod, which are used for solving the problems in the prior art.
The technical scheme of the invention is as follows: the utility model provides a test device is drawn to aeolian husky stock, includes the base, be provided with the proof box that holds aeolian husky in the base, be provided with the vibration loading device that carries out vibration loading to the proof box in the base, be provided with the stand telescopic sleeve that can go up and down on the base, be provided with the counter-force crossbeam on the stand telescopic sleeve, counter-force crossbeam lower extreme is provided with the rotation screw in subassembly in with stock screw in aeolian husky.
The outer wall of the upright post telescopic sleeve forms an external thread, and a leveling nut capable of leveling the counter-force beam is arranged on the external thread.
The base is internally provided with a hydraulic press, the hydraulic press is provided with a lifting support upright post for lifting driving, and the lifting support upright post is inserted into the upright post telescopic sleeve and is driven to lift.
The vibration loading device comprises a vibrator arranged in the base, and the vibration end of the vibrator is in contact with the lower end of the test box.
The rotary screwing-in component comprises a rotary centrifuge arranged at the lower end of the counter-force beam, the rotating end of the rotary centrifuge is connected with a steel rod driver, the steel rod driver is connected with a lifting steel rod component, and the lifting steel rod component is connected with a clamping component for clamping the anchor rod.
The clamping assembly comprises a clamp outer frame connected with the lifting steel rod assembly, and a split anchor for fixing the anchor rod is arranged in the clamp outer frame.
The split anchor comprises two half clamping portions, the two half clamping portions are externally provided with a top-removing conical surface after being spliced, the two half clamping portions are internally provided with assembly holes for clamping anchor rods, and fixing screws capable of pressing the split anchor are arranged in the outer clamp frame.
And a stress sensor used for a drawing test is also arranged between the rotary centrifuge and the steel rod driver.
A testing method of a wind-blown sand anchor rod drawing testing device comprises the following steps:
spreading and compacting aeolian sand
Uniformly scattering aeolian sand into the test box through a test box opening, starting the vibrator, and driving the test box to vibrate by the vibrator so as to vibrate and solidify the aeolian sand in the test box;
ii, mounting, rotating and screwing-in component
Starting a hydraulic press to jack up the upright post telescopic sleeve and the counterforce cross beam to proper heights, and installing a rotary centrifuge, a stress sensor, a steel rod driver, a lifting steel rod assembly and a clamp outer frame below the counterforce cross beam;
iii fixing anchor rod
Installing a split anchor in the outer frame of the clamp, placing the fixing section of the anchor rod into the split anchor, and screwing the fixing screw to fix the anchor rod;
iv, the anchor rod is inserted into the compacted wind-blown sand in a rotating way
Starting the rotary centrifuge and the steel rod driver, controlling the rotating speed of the rotary centrifuge and the extension length of the steel rod driver, lifting the steel rod assembly and the clamping assembly to enable the anchor rod to be inserted into the compacted aeolian sand, and stopping the rotary centrifuge and the steel rod driver after reaching a specified position;
v. loading vibration input
Starting a vibration loading device, and inputting a specified vibration dynamic load to a vibrator through a vibration input joint;
vi. carrying out the drawing test
After the vibration tends to be stable, starting the lifting support upright post to perform a drawing test on the anchor rod by using the counter-force cross beam and the stress sensor, testing the anchoring force and displacement change condition of the anchor rod under the vibration load, paying attention to the deformation degree of a soil body in the drawing process, and finally recording and storing test data in detail;
vii completion of the test
And after the drawing test is finished, the anchor rod is detached.
In the process of dismounting the anchor rod, the reaction cross beam needs to be reduced firstly, the residual drawing force in the anchor rod is released, and then the fixing screw is dismounted.
According to the invention, confining pressure is applied around the anchor rod to effectively simulate the actual stress state of the soil body, and meanwhile, the dynamic drawing of the anchor rod can be realized by the aid of the dynamic loading device system arranged at the counter-force cross beam, so that the stress and deformation conditions of the anchor rod in actual engineering are reflected more truly. The complex problems that a large number of strain gauges need to be attached or a steel bar stress meter needs to be used for testing the axial force of the anchor rod in the traditional anchor rod drawing test are solved, and meanwhile, the precision of the test is improved, so that the test result is more scientific and accurate.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic view of the structure of the base of the present invention;
FIG. 3 is a schematic view of the assembly of the reaction beam of the present invention;
FIG. 4 is a schematic view of the assembly of the vibrator of the present invention;
FIG. 5 is a schematic view of the installation of the rotary centrifuge of the present invention;
FIG. 6 is a schematic view of the installation of the lifting steel bar of the present invention;
FIG. 7 is a detail view of a split anchor according to the present invention;
FIG. 8 is a schematic view of the construction of the anchor of the present invention;
wherein:
1 test box port 2 lifting control screen
3 centrifugal control screen 4 vibration control screen
5 lifting support column 6 sealing rubber sleeve
7 hydraulic press 8 vibration loading device
9 proof box 10 upright column telescopic sleeve
11 reaction beam 12 leveling nut
13 rotating centrifuge 14 stress sensor
15 steel rod driver 16 lifting steel rod assembly
17 clamp outer frame 18 anchor rod fixing clamp mouth
19-split anchor 20 fixing screw
21 data acquisition port
8-1 vibration input joint 8-2 vibrator
16-1 lifting connection steel rod 16-2 outer frame connection steel rod.
Detailed Description
The present invention is described in detail below with reference to the accompanying drawings and examples:
as shown in fig. 1-8, a drift sand anchor rod drawing test device comprises a base, wherein a test box 9 for containing drift sand is arranged in the base, a vibration loading device 8 for carrying out vibration loading on the test box 9 is arranged in the base, a vertical column telescopic sleeve 10 capable of lifting is arranged on the base, a counter-force beam 11 is arranged on the vertical column telescopic sleeve 10, and a rotary screw-in component for rotating an anchor rod 22 to be screwed into the drift sand is arranged at the lower end of the counter-force beam 11.
The outer wall of the upright post telescopic sleeve 10 forms an external thread, and a leveling nut 12 capable of leveling the reaction beam 11 is arranged on the external thread.
Be provided with hydraulic press 7 in the base, be provided with the lift support post 5 that lift drive used on the hydraulic press 7, lift support post 5 inserts in the stand telescopic sleeve 10 and carries out lift drive to it.
The vibration loading device 8 comprises a vibrator 8-2 arranged in the base, and the vibration end of the vibrator 8-2 is in contact with the lower end of the test box 9.
The rotary screwing-in component comprises a rotary centrifuge 13 arranged at the lower end of the counterforce cross beam 11, the rotating end of the rotary centrifuge 13 is connected with a steel rod driver 15, the steel rod driver 15 is connected with a lifting steel rod component 16, and the lifting steel rod component 16 is connected with a clamping component for clamping an anchor rod 22.
The clamping assembly comprises a clamp outer frame 17 connected with the lifting steel rod assembly 16, and a split anchor 19 for fixing an anchor rod 22 is arranged in the clamp outer frame 17.
The split anchor 19 comprises two half clamping parts, the two half clamping parts are externally provided with a top-removing conical surface after being spliced, the two half clamping parts are internally provided with assembly holes for clamping the anchor rod 22, and the clamp outer frame 17 is internally provided with a fixing screw 20 capable of pressing the split anchor 19.
And a stress sensor 14 used for a drawing test is also arranged between the rotary centrifuge 14 and the steel rod driver 15.
The screen assembly used for displaying control is arranged on the outer wall of the base and comprises a lifting control screen 2, a centrifugal control screen 3 and a vibration control screen 4, the lifting control screen 2 is used for displaying lifting information of the upright post telescopic sleeve 10, the centrifugal control screen 3 is used for displaying start and stop of the rotary centrifuge 13, rotating speed, rotating time and the like, and the vibration control screen 4 is used for displaying vibration parameters of the control vibrator 8-2.
The base is also provided with a connecting joint for data transmission, and the connecting joint comprises a data acquisition port 21 and a vibration input joint 8-1.
Preferably, when the wind-blown sand anchor rod drawing test considering the vibration effect is carried out, vibration parameters need to be collected firstly on the spot, and the collected vibration parameters are transmitted to the vibrator 8-2 through the vibration input joint 8-1.
The lifting steel rod assembly 16 comprises a lifting connecting steel rod 16-1 and an outer frame connecting steel rod 16-2, the lifting connecting steel rod 16-1 is connected with the telescopic end of the steel rod driver 15, and the outer frame connecting steel rod 16-2 is connected with the upper end of a clamp outer frame 17.
The steel rod driver 15 is provided on the main shaft of the spin centrifuge 14 so that the steel rod driver 15 can be rotated.
Preferably, the elevator steel rod assembly 16 is coaxial with the anchor rod 22.
The rotary centrifuge 14 may be, but is not limited to, a centrifugal motor, a rotary motor, a rotating disk, and the like.
The steel rod driver 15 may be, but is not limited to, a linear motor, a linear hydraulic cylinder, etc.
A sealing rubber sleeve 6 is also arranged in the base, and the lifting support upright post 5 driven by the hydraulic press 7 can lift in the sealing rubber sleeve 6.
The lifting support column 5 is inserted into and fixed to a column telescopic sleeve 10.
As another embodiment of the wind-blown sand anchor rod drawing test device, the lifting support column 5 is inserted into the column telescopic sleeve 10, the lifting support column 5 and the column telescopic sleeve 10 are in clearance fit, a downward limiting threaded ring is arranged, in the jacking process, the lifting support column 5 slides in the column telescopic sleeve 10 for a certain distance, then jacking is performed, in the downward pulling process, one end of the lifting support column slides for a certain distance, and after contacting with the limiting ring, downward pulling is performed, so that upward and downward delaying actions are correspondingly realized.
The lifting support upright post 5 is columnar or step columnar.
The base may be provided with a pilot counterbore that partially receives the column telescope sleeve 10.
The leveling nut 12 can adjust the position between the reaction beam 11 and the column telescopic sleeve 10 by adjusting the position of the external thread of the column telescopic sleeve 10, thereby keeping the whole reaction beam 11 horizontal.
The anchor clamps frame 17's lower extreme opening part is provided with the assembly plate, it only opens anchor tackle 19 to set up in the assembly plate, it includes two half clamping parts and the stock fixation clamp mouth 18 between the two to open anchor tackle 19, and set screw 20 is in the in-process of carrying out the top tight to two half clamping parts, and the stock fixation clamp mouth 18 between the two shortens to make stock 22 and the tight fit of 19 of opening anchor tackle, realize the clamp of the two.
The anchor rod 22 comprises a rod body positioned on the upper part and an anchoring head positioned on the lower part, and the lower end of the anchoring head is a conical surface.
The test chamber 9 is in clearance fit with a containing hole in the base for containing the test chamber, and the vibrator 8-2 is arranged at the groove bottom of the containing hole.
A testing method of a wind-blown sand anchor rod drawing testing device comprises the following steps:
spreading and compacting aeolian sand
Uniformly scattering aeolian sand into a test box 9 through a test box opening 1, starting a vibrator 8-2, and driving the test box 9 to vibrate by the vibrator 8-2 so as to vibrate the aeolian sand in the test box;
ii, mounting, rotating and screwing-in component
Starting a hydraulic device 7 to jack up the upright post telescopic sleeve 10 and the reaction beam 11 to a proper height, and installing a rotary centrifuge 13, a stress sensor 14, a steel rod driver 15, a lifting steel rod assembly 16 and a clamp outer frame 17 below the reaction beam 11;
iii fixing anchor rod
Installing a split anchor 19 in the clamp outer frame 17, placing a fixing section of an anchor rod 22 into the split anchor 19, and tightening a fixing screw 20 to fix the anchor rod 22;
iv, the anchor rod is inserted into the compacted wind-blown sand in a rotating way
Starting the rotary centrifuge 13 and the steel rod driver 15, controlling the rotating speed of the rotary centrifuge 13 and the extension length of the steel rod driver 15, lifting the steel rod assembly 16 and the clamping assembly to enable the anchor rod 22 to be inserted into the compacted aeolian sand, and stopping the rotary centrifuge 13 and the steel rod driver 15 after reaching a specified position;
v. loading vibration input
Starting the vibration loading device 8, and inputting a specified vibration dynamic load to the vibrator 8-2 through the vibration input joint 8-1;
vi. carrying out the drawing test
After the vibration tends to be stable, starting the lifting support upright post 5 to perform a drawing test on the anchor rod 22 by using the reaction cross beam 11 and the stress sensor 14, testing the anchoring force and displacement change condition of the anchor rod 22 under the vibration load, simultaneously paying attention to the deformation degree of a soil body in the drawing process, and finally recording and storing test data in detail;
vii completion of the test
After the pull test is completed, the anchor 22 is removed.
The procedure of removing the anchor rods 22 requires lowering the reaction beam 11, releasing the residual pullout force in the anchor rods 22, and then removing the set screws 20.
Preferably, before the drawing is realized, the following multi-working-condition comparison tests of the embedding depth of the anchor rod, the shape and the size of the anchor rod and the like are required to be carried out smoothly and effectively.
Preferably, the pulling process needs to stop applying the vibration load, turn on the steel rod lifting switch 15 and adjust the steel rod lifting switch to the lifted state to reduce the length of the lifting steel rod 16-1, then adjust the height of the reaction beam 11 to release the residual pulling force in the anchor rod, and finally sequentially detach the fixing screw 20, the split anchor 19, the anchor rod 22, the clamp outer frame 17, the lifting steel rod device 16, the steel rod driver 15, the stress sensor 14, the rotary centrifuge 13 and other components.
Before the drawing test, the upper plate of the reaction frame 11, the rotary centrifuge 13, the stress sensor 14, the steel rod driver 15 and the clamp outer frame 14 are tightly connected, and the anchor rod 22 is prevented from loosening in the installation process.
In order to ensure the effect of construction effect, the fixing screw 20 locks the split anchorage 19 and the anchor rod 22 in the process of fixing the anchor rod 22, and the split anchorage 19 and the anchor rod 22 are not dislocated when the anchor rod 22 is eccentrically screwed into the soil.
The invention combines a centrifugal construction device and a simulated vibration device. The anchor rod is screwed into the soil body mainly through a centrifugal construction device, and then a train vibration load is applied to carry out a vertical drawing test. In addition, the method can be used for carrying out experimental research on the anchoring characteristics of the anchor rod burial depth and the shape and size of the anchor rod under the action of different construction effects and dynamic loads, the influence of comparatively complex factors such as construction and vibration on the anchor rod in actual engineering is reduced to a high degree, and the method has higher practical application value in development and research.
The method not only avoids the defects of high construction cost, long construction period, incapability of performing multi-working-condition analysis tests and incapability of systematically and objectively analyzing the anchoring performance of the anchor rod in field tests, but also has the advantages of simple operation of indoor model test steps, strong controllability, capability of repeatedly performing contrast tests and the like, and can effectively restore the anchoring rule of the wind-blown sand stratum in the actual engineering. The invention has huge development prospect. The key point of the invention is to effectively simulate different anchoring states of the anchor rod under the construction effect and the vibration effect in the anchoring engineering of the aeolian sand anchor rod. The wind-blown sand anchor rod indoor drawing test method considering the construction effect and the vibration effect is provided based on the pertinence, and the method is practical and easy to implement and has high reference value.
Claims (10)
1. The utility model provides a testing arrangement is drawn to aeolian husky stock, includes the base, its characterized in that: the wind-blown sand testing device is characterized in that a test box (9) for containing wind-blown sand is arranged in the base, a vibration loading device (8) for performing vibration loading on the test box (9) is arranged in the base, a vertical column telescopic sleeve (10) capable of lifting is arranged on the base, a counter-force beam (11) is arranged on the vertical column telescopic sleeve (10), and a rotary screw-in component for rotating an anchor rod (22) into the wind-blown sand is arranged at the lower end of the counter-force beam (11).
2. The aeolian sand anchor rod drawing test device according to claim 1, wherein: the outer wall of the upright post telescopic sleeve (10) forms an external thread, and a leveling nut (12) capable of leveling the reaction beam (11) is arranged on the external thread.
3. The aeolian sand anchor rod drawing test device according to claim 1, wherein: be provided with hydraulic press (7) in the base, be provided with lift support post (5) that lift drive used on hydraulic press (7), lift support post (5) insert in stand telescopic sleeve (10) and carry out lift drive to it.
4. The aeolian sand anchor rod drawing test device according to claim 1, wherein: the vibration loading device (8) comprises a vibrator (8-2) arranged in the base, and the vibration end of the vibrator (8-2) is in contact with the lower end of the test box (9).
5. The aeolian sand anchor rod drawing test device according to claim 1, wherein: the rotary screwing component comprises a rotary centrifuge (13) arranged at the lower end of the counter-force beam (11), the rotating end of the rotary centrifuge (13) is connected with a steel rod driver (15), the steel rod driver (15) is connected with a lifting steel rod component (16), and the lifting steel rod component (16) is connected with a clamping component for clamping an anchor rod (22).
6. The aeolian sand anchor rod drawing test device according to claim 5, wherein: the clamping assembly comprises a clamp outer frame (17) connected with the lifting steel rod assembly (16), and a split anchor (19) for fixing the anchor rod (22) is arranged in the clamp outer frame (17).
7. The aeolian sand anchor rod drawing test device according to claim 6, wherein: run from opposite directions ground tackle (19) and include two half clamping parts, two half clamping parts are outside for going the apical cone after the piecing together, and inside is the pilot hole of pressing from both sides tight stock (22), be provided with in anchor clamps frame (17) and can compress tightly fixed screw (20) with run from opposite directions ground tackle (19).
8. The aeolian sand anchor rod drawing test device according to claim 7, wherein: and a stress sensor (14) used for a drawing test is also arranged between the rotary centrifuge (14) and the steel rod driver (15).
9. A test method of a wind-blown sand anchor rod drawing test device is characterized in that: the method comprises the following steps:
spreading and compacting aeolian sand
Uniformly scattering aeolian sand into a test box (9) through a test box opening (1), starting a vibrator (8-2), and driving the test box (9) to vibrate by the vibrator (8-2) so as to vibrate the aeolian sand in the test box;
(ii) mounting a rotary screw-in assembly
Starting a hydraulic press (7) to jack up the upright post telescopic sleeve (10) and the reaction beam (11) to proper heights, and installing a rotary centrifuge (13), a stress sensor (14), a steel rod driver (15), a lifting steel rod assembly (16) and a clamp outer frame (17) below the reaction beam (11);
(iii) fixing the anchor rod
Installing a split anchor (19) in the clamp outer frame (17), placing a fixing section of the anchor rod (22) into the split anchor (19), screwing a fixing screw (20) and fixing the anchor rod (22);
(iv) the anchor rod is inserted into the compacted wind-blown sand in a rotating manner
Starting the rotary centrifuge (13) and the steel rod driver (15), controlling the rotating speed of the rotary centrifuge (13) and the extension length of the steel rod driver (15), lifting the steel rod assembly (16) and the clamping assembly to enable the anchor rod (22) to be inserted into the compacted aeolian sand, and stopping the rotary centrifuge (13) and the steel rod driver (15) after reaching a specified position;
(v) Loading vibration input
Starting a vibration loading device (8), and inputting a specified vibration dynamic load to a vibrator (8-2) through a vibration input joint (8-1);
(vi) conducting the drawing test
After the vibration tends to be stable, starting the lifting support upright post (5) to perform a drawing test on the anchor rod (22) by using the reaction cross beam (11) and the stress sensor (14), testing the anchoring force and displacement change condition of the anchor rod (22) under the vibration load, paying attention to the deformation degree of a soil body in the drawing process, and finally recording and storing test data in detail;
(vii) completion of the test
After the drawing test is finished, the anchor rod (22) is detached.
10. The testing method of the aeolian sand anchor rod drawing testing device according to claim 1, wherein the testing method comprises the following steps: in the process of detaching the anchor rod (22), the reaction cross beam (11) needs to be lowered firstly, the residual drawing force in the anchor rod (22) is released, and then the fixing screw (20) is detached.
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| CN202010497803.8A CN111721613A (en) | 2020-06-04 | 2020-06-04 | Wind-blown sand anchor rod drawing test device and test method thereof |
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| CN202010497803.8A CN111721613A (en) | 2020-06-04 | 2020-06-04 | Wind-blown sand anchor rod drawing test device and test method thereof |
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| CN107190744A (en) * | 2017-06-06 | 2017-09-22 | 宁波市交通建设工程试验检测中心有限公司 | A kind of ground anchorage suitable for saturated sand place |
| CN107300465A (en) * | 2017-08-10 | 2017-10-27 | 山东建筑大学 | Tension-torsion collective effect lower prestress anchor rod body Mechanics Performance Testing device and method |
| CN107621412A (en) * | 2017-09-30 | 2018-01-23 | 青岛理工大学 | A kind of quick pull-out test device of the nonmetallic anti-float anchor rod of enlarged footing |
| CN109374855A (en) * | 2018-09-20 | 2019-02-22 | 中南大学 | A kind of simulation railway bed is risen soil defect phenomenon experimental rig and test method |
| CN210071552U (en) * | 2018-11-16 | 2020-02-14 | 河北建筑工程学院 | Triaxial confining pressure test device for pile and anchor rod |
| CN110241802A (en) * | 2019-05-31 | 2019-09-17 | 湖北建科国际工程有限公司 | Static penetrometer earth anchor |
| CN110186760A (en) * | 2019-06-13 | 2019-08-30 | 河北建筑工程学院 | A kind of soil property anchor rod drawing test method for considering to change confining pressure condition |
| CN110485480A (en) * | 2019-07-16 | 2019-11-22 | 浙江元本检测技术股份有限公司 | Novel pre-stressed tubular pole pulling resistance testing device |
| CN210243379U (en) * | 2019-07-18 | 2020-04-03 | 安徽建筑大学 | Slurry anchor connecting piece detection device for steel bar lapping |
| CN110468886A (en) * | 2019-07-29 | 2019-11-19 | 浙江大学 | A kind of one-time continuous loading device can be used for centrifuge anchor foundation |
| CN110631910A (en) * | 2019-09-27 | 2019-12-31 | 福州大学 | Fire test testing device and method for prestressed steel strand |
| CN110847165A (en) * | 2019-11-29 | 2020-02-28 | 河海大学 | Construction method of spiral anchor core-inserting cement mixing pile |
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