CN112179781B - Concrete pole mechanical properties detecting system - Google Patents
Concrete pole mechanical properties detecting system Download PDFInfo
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- CN112179781B CN112179781B CN202011075591.0A CN202011075591A CN112179781B CN 112179781 B CN112179781 B CN 112179781B CN 202011075591 A CN202011075591 A CN 202011075591A CN 112179781 B CN112179781 B CN 112179781B
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- 230000008093 supporting effect Effects 0.000 claims abstract description 77
- 230000007246 mechanism Effects 0.000 claims abstract description 48
- 238000001514 detection method Methods 0.000 claims abstract description 11
- 238000000034 method Methods 0.000 abstract description 7
- 238000012360 testing method Methods 0.000 abstract description 7
- 229910000831 Steel Inorganic materials 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 239000004568 cement Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000010720 hydraulic oil Substances 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
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
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- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Force Measurement Appropriate To Specific Purposes (AREA)
- Clamps And Clips (AREA)
Abstract
The invention discloses a system for detecting mechanical properties of a concrete pole, relates to the technical field of concrete poles, and solves the problems that in the existing mechanical testing process of the concrete pole, the supporting position of the pole is inconvenient to adjust, the detection results of the poles with different lengths are affected, the detection process is troublesome and the like. The utility model provides a concrete pole mechanical properties detecting system, includes the pole main part, the outside fixed mounting of pole main part one end has the load to apply the mechanism, the load is applied the mechanism and is included main part skew display lever, lock sleeve, second tip locating rack, guide bar, second supporting spring, spacing supporting sleeve, connection braced frame, hydro-cylinder supporting seat, hydraulic cylinder and skew guide post, skew guide post face fixed mounting has the hydro-cylinder supporting seat. According to the invention, the deformation of the electric pole is displayed by applying different loads, so that the performance of the electric pole can be detected, the supporting position can be conveniently adjusted, and the electric pole is suitable for electric poles with different lengths.
Description
Technical Field
The invention relates to the technical field of concrete electric poles, in particular to a system for detecting mechanical properties of a concrete electric pole.
Background
With the rapid development of social economy, the coverage rate of a power grid is higher and higher, an electric pole is usually used for supporting the laying of a cable, a concrete electric pole is an electric pole made of concrete and steel bars or steel wires, an annular concrete electric pole is composed of sand, stone, cement, steel and the like, the annular concrete electric pole is a cement prefabricated component commonly adopted on an electric overhead line, a communication line and a lighting line, and according to the standard GB 4623-2014 annular concrete electric pole, mechanical property tests are carried out on sampling of the annular concrete electric pole to ensure that the quality of products in the batch meets the standard requirements.
However, the existing mechanical test process for the concrete pole is inconvenient to adjust the pole supporting part, so that the detection results of the poles with different lengths are affected, and the detection process is troublesome; therefore, the existing requirements are not met, and a concrete pole mechanical property detection system is provided.
Disclosure of Invention
The invention aims to provide a system for detecting the mechanical properties of a concrete pole, which is used for solving the problems that the existing mechanical test process for the concrete pole provided in the background art is inconvenient to adjust the supporting part of the pole, so that the detection results of the poles with different lengths are affected, the detection process is troublesome and the like.
In order to achieve the above purpose, the present invention provides the following technical solutions: the utility model provides a concrete pole mechanical properties detecting system, includes the pole main part, the outside fixed mounting of pole main part one end has the load to apply the mechanism, the load is applied the mechanism and is included main part skew display lever, lock sleeve, second tip locating rack, guide bar, second supporting spring, spacing brace, connection braced frame, hydro-cylinder supporting seat, hydro-cylinder and skew guide post, skew guide post fixed mounting has the hydro-cylinder supporting seat, the top of hydro-cylinder supporting seat is fixed with the hydro-cylinder through the screw connection, the outside sliding connection of skew guide post upper end has the connection braced frame, the up end fixed mounting of connection braced frame has spacing brace, one side fixed mounting of spacing brace has two guide bars, the outside sliding connection of guide bar has the second supporting spring, one of them the one end of second supporting spring is provided with the second tip locating rack, the lock sleeve is installed to one side of second tip locating rack, the inboard of lock sleeve is installed the main part skew display lever, the outside sliding connection of main part skew display lever one end has the angle to shift display mechanism, the outside sliding connection of angle skew display mechanism has the fixed connection mechanism of end, the fixed connection mechanism of pole tip end has the fixed connection mechanism.
Preferably, the connecting and locking mechanism comprises an end connecting sleeve plate, a connecting support plate, a middle supporting arc plate, a locking rod and a connecting thread sleeve, wherein the end connecting sleeve plate is fixedly installed at two ends of the lower end surface of the connecting support plate, the connecting thread sleeve is fixedly installed on the inner side of the middle part of the connecting support plate, the locking rod is installed on the inner side of the connecting thread sleeve, and the middle supporting arc plate is fixedly installed at the bottom end of the locking rod.
Preferably, the pole end fixing mechanism comprises a bottom supporting frame, locking clamping plates, fixing connecting rods, supporting foot plates and a rod body connecting frame, wherein two locking clamping plates are fixedly arranged on the upper end face of the bottom supporting frame, two supporting foot plates are fixedly arranged at two ends of each locking clamping plate, fixing connecting rods are fixedly arranged on the upper end faces of the supporting foot plates, and two rod body connecting frames are slidably connected to the outer sides of the upper ends of the fixing connecting rods.
Preferably, the angle deviation display mechanism comprises a first supporting spring, a fixed guide post, a movable positioning plate and a first end positioning frame, wherein one side of the first end positioning frame is slidably connected with the movable positioning plate, the inner sides of two ends of the movable positioning plate are slidably connected with the fixed guide posts, and the outer sides of the bottom ends of the fixed guide posts are provided with the first supporting spring.
Preferably, the bottom of hydro-cylinder supporting seat and skew guide post welded fastening, the inboard of connecting support frame bottom is provided with the guiding hole, the upper end of skew guide post extends to the inboard of guiding hole, the both ends welded fastening of second tip locating rack is passed through to the one end of guide bar in spacing supporting sleeve, second tip locating rack and spacing supporting sleeve pass through two second support spring connections, the other end and the second tip locating rack of guide bar pass through the nut connection and fix.
Preferably, the connecting thread sleeve is welded and fixed with the connecting support plate, the locking rod is connected with the connecting thread sleeve through threads, and an operating handle is arranged at the top end of the locking rod.
Preferably, the inner side of the locking clamping plate is provided with a positioning arc groove, the supporting foot plate and the two ends of the locking clamping plate are welded and fixed, and the bottom end of the fixed connecting rod penetrates through the two ends of the rod body connecting frame and the upper end surfaces of the four other supporting foot plates respectively.
Preferably, both ends of the movable positioning plate are connected with the pole end fixing mechanisms through first supporting springs, and one side of the first end positioning frame is provided with a waist-shaped hole.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the invention, the position of the locking clamping plate relative to the main body of the electric pole is adjusted according to the length of the main body of the electric pole, and the end connecting sleeve plate is sleeved on the outer side of the middle part of the connecting frame of the rod body, so that the position of the locking clamping plate can be determined through the connecting frame of the rod body, the locking rod is convenient to use, and the middle supporting arc plate is driven to further support one locking clamping plate while the locking rod rotates, so that the stability of a test is convenient to maintain;
2. according to the invention, the limiting support sleeve is pressed down through the hydraulic oil cylinder, so that load is applied to one end of the electric pole main body through the transmission of the limiting support sleeve, the height of one end of the main body deviation display rod is adjusted on the inner side of the waist-shaped hole formed in one side of the first end positioning frame, the movable positioning plate is driven to slide on the outer side of the fixed guide post, and the deformation of the electric pole main body can be detected and observed through the height variation of the movable positioning plate.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic view of a partial structure of the pole end fixing mechanism of the present invention;
FIG. 3 is a schematic view of a partial cross-sectional structure of the connection locking mechanism of the present invention;
FIG. 4 is a schematic view of a partial structure of an angle offset display mechanism according to the present invention;
FIG. 5 is a schematic view of a partial structure of the load applying mechanism of the present invention;
fig. 6 is a schematic view of a partial cross-sectional structure of the load applying mechanism of the present invention.
In the figure: 1. an electric pole body; 2. connecting a locking mechanism; 201. the end part is connected with a sleeve plate; 202. a connecting support plate; 203. the middle part supports an arc plate; 204. a locking lever; 205. connecting a threaded sleeve; 3. an electric pole end fixing mechanism; 301. a bottom support frame; 302. locking the clamping plate; 303. fixing the connecting rod; 304. a support foot plate; 305. a rod body connecting frame; 4. an angle shift display mechanism; 401. a first support spring; 402. fixing the guide post; 403. a movable positioning plate; 404. a first end locating rack; 5. a load applying mechanism; 501. the main body is offset from the display rod; 502. a locking sleeve; 503. a second end positioning frame; 504. a guide rod; 505. a second support spring; 506. a limit support sleeve; 507. connecting a supporting frame; 508. an oil cylinder supporting seat; 509. a hydraulic cylinder; 510. offset guide posts.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments.
The hydraulic cylinder 509 (model SJYG 70-1000) of the present invention is commercially available or custom-made.
Referring to fig. 1 to 6, an embodiment of the present invention provides: the utility model provides a concrete pole mechanical properties detecting system, including pole main part 1, the outside fixed mounting of pole main part 1 one end has load to apply mechanism 5, load is applied mechanism 5 and is included main part skew display lever 501, lock sleeve 502, second end locating rack 503, guide bar 504, second supporting spring 505, spacing support sleeve 506, connect the braced frame 507, hydro-cylinder supporting seat 508, hydraulic cylinder 509 and skew guide post 510, skew guide post 510 face fixed mounting has hydro-cylinder supporting seat 508, the top of hydro-cylinder supporting seat 508 is fixed with hydraulic cylinder 509 through the screw connection, the outside sliding connection of skew guide post 510 upper end has connect braced frame 507, connect the up end fixed mounting of braced frame 507 has spacing support sleeve 506, one side fixed mounting of spacing support sleeve 506 has two guide bars 504, the outside sliding connection of guide bar 504 has second supporting spring 505, one end of one second supporting spring 505 is provided with a second end positioning frame 503, one side of the second end positioning frame 503 is provided with a locking sleeve 502, the inner side of the locking sleeve 502 is provided with a main body deviation display rod 501, the main body deviation display rod 501 is convenient to fix and position through the locking sleeve 502, the outer side of one end of the main body deviation display rod 501 is slidably connected with an angle deviation display mechanism 4, the outer side of the angle deviation display mechanism 4 is provided with a pole end fixing mechanism 3, the one end of the pole main body 1 can be fixed through the pole end fixing mechanism 3, the actual stress condition is convenient to simulate, the upper end face of the pole end fixing mechanism 3 is fixedly provided with a connecting locking mechanism 2, the whole is convenient to adjust the supporting position through the display of deformation of applying different loads to the pole, the performance of the pole can be detected, the electric pole is suitable for electric poles with different lengths.
Further, the connection locking mechanism 2 comprises an end connection sleeve plate 201, a connection support plate 202, a middle support arc plate 203, a locking rod 204 and a connection thread sleeve 205, wherein the end connection sleeve plate 201 is fixedly installed at two ends of the lower end face of the connection support plate 202, the connection thread sleeve 205 is fixedly installed on the inner side of the middle part of the connection support plate 202, the locking rod 204 is installed on the inner side of the connection thread sleeve 205, the middle support arc plate 203 is fixedly installed at the bottom end of the locking rod 204, and the electric pole main body 1 can be further supported and fixed through the connection locking mechanism 2.
Further, pole end fixing mechanism 3 includes bottom sprag frame 301, locking cardboard 302, fixed connection pole 303, support sole 304 and body of rod link 305, and the up end fixed mounting of bottom sprag frame 301 has two locking cardboard 302, and two support sole 304 are all installed to the both ends of locking cardboard 302, and wherein the up end fixed mounting of four support sole 304 has fixed connection pole 303, and wherein the outside sliding connection of two fixed connection pole 303 upper ends has body of rod link 305, can carry out fixed operation to the one end of pole main part 1 through pole end fixing mechanism 3, is convenient for simulate actual atress condition.
Further, the angular deviation display mechanism 4 includes a first support spring 401, a fixed guide post 402, a movable positioning plate 403 and a first end positioning frame 404, one side of the first end positioning frame 404 is slidably connected with the movable positioning plate 403, inner sides of two ends of the movable positioning plate 403 are slidably connected with the fixed guide post 402, the outer side of the bottom end of the fixed guide post 402 is provided with the first support spring 401, and the deformation of the electric pole main body 1 after the load is applied can be displayed through the angular deviation display mechanism 4.
Further, the bottom of hydro-cylinder supporting seat 508 and skew guide post 510 welded fastening, the inboard of connection braced frame 507 bottom is provided with the guiding hole, the upper end of skew guide post 510 extends to the inboard of guiding hole, the both ends welded fastening of second tip locating rack 503 is in one side of spacing supporting sleeve 506 is run through to the one end of guide bar 504, second tip locating rack 503 is connected through two second supporting springs 505 with spacing supporting sleeve 506, the other end and the second tip locating rack 503 of guide bar 504 pass through the nut connection and fix, be convenient for fix and location operation to main part skew display lever 501 through lock sleeve 502.
Further, the connecting thread sleeve 205 is welded and fixed with the connecting support plate 202, the locking rod 204 is connected with the connecting thread sleeve 205 through threads, an operating handle is arranged at the top end of the locking rod 204, the locking rod 204 rotates and drives the middle support arc plate 203 to further support one of the locking clamping plates 302, and stability of testing is maintained conveniently.
Further, a positioning arc groove is formed in the inner side of the locking clamping plate 302, the supporting foot plates 304 are welded and fixed to two ends of the locking clamping plate 302, the bottom ends of the fixed connecting rods 303 penetrate through two ends of the rod body connecting frame 305 and the upper end faces of the four other supporting foot plates 304 are welded and fixed to the four other supporting foot plates 304 respectively, and the position of the locking clamping plate 302 relative to the electric pole main body 1 is adjusted according to the length of the electric pole main body 1.
Further, both ends of the movable positioning plate 403 are connected to the pole end fixing mechanism 3 through the first supporting spring 401, and a waist-shaped hole is provided on one side of the first end positioning frame 404, so that one end of the main body offset display rod 501 is guided through the waist-shaped hole.
Working principle: when in use, the electric pole main body 1 to be tested is placed on the inner sides of the two locking clamping plates 302, the inner sides of the locking clamping plates 302 are provided with positioning arc grooves, so that the electric pole main body 1 is positioned, the locking clamping plates 302 are adjusted relative to the electric pole main body 1 according to the length of the electric pole main body 1, the upper end of the fixed connecting rod 303 is fixedly connected with the supporting foot plate 304 through nuts, the locking clamping plates 302 are locked, the fixing is facilitated, the end connecting sleeve plate 201 is sleeved on the outer side of the middle part of the rod connecting frame 305, the position of the locking clamping plates 302 can be determined through the rod connecting frame 305, the electric pole main body 1 is convenient to use, the operating handle arranged at the top end of the locking rod 204 is operated, the locking rod 204 is connected with the connecting thread sleeve 205 through threads, the locking rod 204 rotates and drives the middle supporting arc plate 203 to further support one locking clamping plate 302, so that the stability of test is kept, the other end of the electric pole main body 1 is inserted into the inner side of the limiting support sleeve 506, the first end positioning frame 404 and the second end positioning frame 503 are respectively placed at two ends of the electric pole main body 1, the main body deviation display rod 501 respectively penetrates through the movable positioning plate 403, the second end positioning frame 503 and the locking sleeve 502, the main body deviation display rod 501 is fixedly connected with the locking sleeve 502 through threads, two ends of the second end positioning frame 503 are connected with the limiting support sleeve 506 through the second supporting spring 505, the second end positioning frame 503 is fixed and supported through the guide rod 504, the power supply is connected, the hydraulic cylinder 509 is started, the hydraulic cylinder 509 is enabled to press the limiting support sleeve 506 under the supporting action of the cylinder support seat 508, and then carry out the application of load to the one end of pole main part 1 through the transmission of spacing spacer 506, be provided with the guiding hole in the inboard of connecting braced frame 507 bottom, and then the in-process that the pole main part 1 took place micro-deformation offset guide post 510 moves for connecting braced frame 507, the other end of main part offset display pole 501 carries out the regulation of height in the inboard that first tip locating rack 404 side was provided with waist type hole simultaneously, the other end of main part offset display pole 501 sets up the inboard at movable locating plate 403 middle part, and then drive movable locating plate 403 and slide in the outside of fixed guide post 402, can detect and observe the deflection of pole main part 1 through the variation in height to fixed guide post 402, the both ends and the bottom support frame 301 of movable locating plate 403 are all connected through first supporting spring 401, make the both ends of first supporting spring 401 support the movable locating plate 403, reduce the influence of the dead weight of movable locating plate 403 to main part offset display pole 501.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (5)
1. The utility model provides a concrete pole mechanical properties detecting system, includes pole main part (1), its characterized in that: the utility model provides a pole body, the outside fixed mounting of pole main part (1) one end has load to apply mechanism (5), load is applied mechanism (5) including main part skew display lever (501), lock sleeve (502), second tip locating rack (503), guide bar (504), second supporting spring (505), spacing support sleeve (506), connection braced frame (507), hydro-cylinder supporting seat (508), hydraulic cylinder (509) and skew guide post (510), skew guide post (510) face fixed mounting has hydro-cylinder supporting seat (508), the top of hydro-cylinder supporting seat (508) is fixed with hydraulic cylinder (509) through the screw connection, the outside sliding connection of skew guide post (510) upper end has connection braced frame (507), the up end fixed mounting of connection braced frame (507) has spacing support sleeve (506), one side fixed mounting of spacing support sleeve (506) has two guide bars (504), the outside sliding connection of guide bar (504) has second supporting spring (505), one of them second supporting spring (505) one end is provided with second tip locating rack (503), the inside locking sleeve (502) is installed to the outside of the location frame (502), the outer side of one end of the main body deviation display rod (501) is slidably connected with an angle deviation display mechanism (4), an electric pole end fixing mechanism (3) is arranged on the outer side of the angle deviation display mechanism (4), and a connecting and locking mechanism (2) is fixedly arranged on the upper end face of the electric pole end fixing mechanism (3);
the connecting and locking mechanism (2) comprises an end connecting sleeve plate (201), a connecting support plate (202), a middle supporting arc plate (203), a locking rod (204) and a connecting thread sleeve (205), wherein the end connecting sleeve plate (201) is fixedly installed at two ends of the lower end face of the connecting support plate (202), the connecting thread sleeve (205) is fixedly installed on the inner side of the middle part of the connecting support plate (202), the locking rod (204) is installed on the inner side of the connecting thread sleeve (205), and the middle supporting arc plate (203) is fixedly installed at the bottom end of the locking rod (204);
the pole end fixing mechanism (3) comprises a bottom supporting frame (301), locking clamping plates (302), fixing connecting rods (303), supporting foot plates (304) and a rod body connecting frame (305), wherein two locking clamping plates (302) are fixedly arranged on the upper end face of the bottom supporting frame (301), two supporting foot plates (304) are fixedly arranged at two ends of each locking clamping plate (302), fixing connecting rods (303) are fixedly arranged on the upper end faces of four supporting foot plates (304), and the outer sides of the upper ends of the two fixing connecting rods (303) are slidably connected with the rod body connecting frame (305);
the angle deviation display mechanism (4) comprises a first supporting spring (401), a fixed guide post (402), a movable positioning plate (403) and a first end positioning frame (404), wherein one side of the first end positioning frame (404) is connected with the movable positioning plate (403) in a sliding mode, the inner sides of two ends of the movable positioning plate (403) are connected with the fixed guide post (402) in a sliding mode, and the outer side of the bottom end of the fixed guide post (402) is provided with the first supporting spring (401).
2. A concrete pole mechanical property detection system as recited in claim 1, wherein: the bottom of hydro-cylinder supporting seat (508) and skew guide post (510) welded fastening, the inboard of connecting braced frame (507) bottom is provided with the guiding hole, the upper end of skew guide post (510) extends to the inboard of guiding hole, the one end of guide bar (504) runs through the both ends welded fastening of second tip locating rack (503) in one side of spacing supporting sleeve (506), second tip locating rack (503) are connected through two second supporting springs (505) with spacing supporting sleeve (506), the other end and second tip locating rack (503) of guide bar (504) are fixed through the nut connection.
3. A concrete pole mechanical property detection system as recited in claim 1, wherein: the connecting thread sleeve (205) is welded and fixed with the connecting support plate (202), the locking rod (204) is connected with the connecting thread sleeve (205) through threads, and an operating handle is arranged at the top end of the locking rod (204).
4. A concrete pole mechanical property detection system as recited in claim 1, wherein: the inboard of locking cardboard (302) is provided with the location arc groove, the equal welded fastening in both ends of supporting foot board (304) and locking cardboard (302), the bottom of fixed connection pole (303) runs through the both ends of body of rod link (305) and four up end that supporting foot board (304) welded fastening four other supporting foot boards (304) wherein respectively.
5. A concrete pole mechanical property detection system as recited in claim 1, wherein: both ends of the movable locating plate (403) are connected with the pole end fixing mechanism (3) through a first supporting spring (401), and a waist-shaped hole is formed in one side of the first end locating frame (404).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011075591.0A CN112179781B (en) | 2020-10-10 | 2020-10-10 | Concrete pole mechanical properties detecting system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011075591.0A CN112179781B (en) | 2020-10-10 | 2020-10-10 | Concrete pole mechanical properties detecting system |
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| CN112179781A CN112179781A (en) | 2021-01-05 |
| CN112179781B true CN112179781B (en) | 2024-02-09 |
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| CN202011075591.0A Active CN112179781B (en) | 2020-10-10 | 2020-10-10 | Concrete pole mechanical properties detecting system |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN119198057B (en) * | 2024-10-29 | 2025-04-04 | 云南丰源水泥制品有限公司 | New material cement electric pole stress performance detection test platform and method |
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