CN110455441B - External cable prestressing force test auxiliary device - Google Patents
External cable prestressing force test auxiliary device Download PDFInfo
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- CN110455441B CN110455441B CN201910670313.0A CN201910670313A CN110455441B CN 110455441 B CN110455441 B CN 110455441B CN 201910670313 A CN201910670313 A CN 201910670313A CN 110455441 B CN110455441 B CN 110455441B
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- prestressed tendon
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/10—Measuring force or stress, in general by measuring variations of frequency of stressed vibrating elements, e.g. of stressed strings
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/10—Measuring force or stress, in general by measuring variations of frequency of stressed vibrating elements, e.g. of stressed strings
- G01L1/106—Constructional details
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- General Physics & Mathematics (AREA)
- Reinforcement Elements For Buildings (AREA)
- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
Abstract
The invention discloses an auxiliary device for testing the prestress of an external cable, which comprises a U-shaped steel plate, a prestressed tendon fixing piece, a nut gasket, a fixing screw rod, a sensor, a connecting screw rod and a prestressed tendon. The U-shaped steel plate is provided with a through hole, and the diameter of the through hole is equal to the diameter of the fixing screw. The prestressed tendon fixing piece is an arc-shaped steel plate, the diameter of the arc of the prestressed tendon fixing piece is the same as that of the prestressed tendon, and a hole which is the same as the diameter of the through hole of the U-shaped steel plate but does not penetrate through the through hole is formed in the outer side of the prestressed tendon fixing piece. The outer side of one end of the fixing screw rod is provided with threads and is screwed and fixed with the U-shaped steel plate through a nut and a nut gasket, a section of pore channel is arranged inside the other end of the fixing screw rod, and the inner wall of the pore channel is provided with threads. And a pore canal with the same diameter and length as the fixed screw is arranged in the sensor. The surface of the connecting screw rod is provided with threads, the diameter of the connecting screw rod is the same as that of the inner pore passage of the sensor, and the sensor and the fixing screw rod are fixed through the connecting screw rod. The invention can accurately test the vibration frequency of the prestressed tendon, has the advantages of economic manufacturing cost, convenient use and maintenance and good engineering practical value.
Description
Technical Field
The invention belongs to the technical field of bridge detection and monitoring, and particularly relates to an auxiliary device for in-vitro cable prestress testing.
Background
In the existing highway bridges in China, after a large number of bridges are operated for many years, the bearing capacity cannot meet the requirement of increasing traffic, and when the cross section of the bridge structure is not allowed to have tensile stress or the tensile stress exceeds the limit, prestress is often applied for reinforcement. A commonly used pre-stress reinforcement technique is the in vitro pre-stress reinforcement method.
The external prestress reinforcing method is easy to cause prestress loss due to the fact that the external prestress rib deformation is inconsistent with the concrete deformation, so that the detection of the effective prestress value of the external prestress rib in service has important practical significance and engineering practical value for comprehensively knowing the structural performance of the bridge. The commonly used in-vitro beam prestress detection method is a frequency test method, and the principle is that the effective prestress value of the steel beam is indirectly calculated by testing the frequency of the steel beam according to the deterministic relationship between the prestress value and the frequency of the steel beam. At present, most of existing frequency testing devices for bridge detection and monitoring are complex in structural principle, and the prestressed tendon frequency value cannot be rapidly tested to calculate effective prestress.
Disclosure of Invention
The purpose of the invention is as follows: in order to solve the technical problems that the structural principle of the device is complex in the process of testing the in-vitro tendon prestress by the frequency method, and the frequency value of the prestressed tendon cannot be quickly tested to calculate the effective prestressed engineering, the invention provides the in-vitro cable prestress testing auxiliary device, which is used for accurately testing the vibration frequency of the prestressed tendon, is economical in manufacturing cost, convenient to use and maintain and has good engineering practical value.
The technical scheme is as follows: in order to realize the purpose of the invention, the technical scheme adopted by the invention is as follows: the utility model provides an external cable prestressing force test auxiliary device, includes U shaped steel board 1, prestressing tendons stationary blade 2, nut 31, nut gasket 4, clamping screw 5, sensor 6, connecting screw 7, prestressing tendons 8.
And a through hole is formed in the center of one side face of the U-shaped steel plate 1, and the diameter of the through hole is the same as that of the fixing screw 5. The prestressed tendon fixing piece 2 is an arc-shaped steel plate and is positioned on the U-shaped steel plate 1, the diameter of the arc of the prestressed tendon fixing piece is the same as that of the prestressed tendon 8, a cylindrical hole is formed in the outer side of the prestressed tendon fixing piece, and the hole does not penetrate through the prestressed tendon fixing piece 2. The diameter of the hole of the prestressed tendon fixing piece 2 is the same as that of the through hole of the U-shaped steel plate 1. The prestressed tendon 8 is positioned on the side surface of the U-shaped steel plate 1 without a through hole and is clamped with the prestressed tendon fixing piece 2 without relative sliding.
The outside of 5 one ends of set screw rods sets up the screw thread to the hole that passes 1 side of U shaped steel board and the cylindrical hole joint in the prestressing tendons stationary blade 2 outsides. The nut 31 and the nut washer 4 are screwed to the fixing screw 5. Make U shaped steel board 1, prestressing tendons stationary blade 2, prestressing tendons 8 reciprocal anchorage through nut 31, nut gasket 4, clamping screw 5, prevent that the device from taking place not hard up when 8 vibrations of prestressing tendons to influence the test effect. A section of pore channel is arranged inside the other end of the fixed screw rod 5, and the inner wall of the pore channel is provided with threads.
The sensor 6 is internally provided with a section of pore, the inner wall of the pore is provided with threads, the diameter and the length of the pore inside the sensor 6 are the same as those of the pore inside the fixing screw rod 5, and the sensor 6 and the fixing screw rod 5 are fixedly connected through a connecting screw rod 7. The outer surface of the connecting screw 7 is provided with threads, one end of the connecting screw is in threaded connection with the inner hole of the fixing screw 5, and the other end of the connecting screw is in threaded connection with the inner hole of the sensor 6.
Further, a fixing nut 32 is welded to an end portion of the fixing screw 5 connected to the connecting screw 7, the fixing nut 32 is screwed to the connecting screw 7, and the fixing nut 32 and the fixing screw 5 are rotated synchronously, so that the rotation fastening operation of the fixing screw 5 is facilitated.
Further, the length and the diameter of the fixing screw rod 5 are adjusted according to the diameter and the frequency of the external cable, namely the diameter and the frequency of the prestressed tendon 8, and both the length and the diameter can achieve expected test effects.
Further, set up the protective sheath as required between prestressing tendons 8 and prestressing tendons stationary blade 2 for prevent that prestressing tendons 8 from receiving the damage. Preferably, the material of the protective sleeve is nylon, polyethylene or polypropylene.
When the device is used, the whole device keeps fixed when the prestressed tendon 8 vibrates through the U-shaped steel plate 1, the prestressed tendon fixing piece 2 and the fixing screw 5, and the accuracy of frequency testing is ensured. The prestressed tendon 8 and the sensor 6 are connected through the prestressed tendon fixing piece 2, the fixing screw rod 5 and the connecting screw rod 7, and the vibration of the prestressed tendon 8 can be effectively transmitted to the sensor 6 through the fixing screw rod 5 and the connecting screw rod 7. Meanwhile, because the rigidity of the steel plate and the screw rod adopted by the device is far greater than that of the prestressed tendon 8, according to the theory of structural dynamics, the frequency of the device is obviously higher than the external cable base frequency, and the accuracy of frequency testing can be ensured.
Has the advantages that: compared with the prior art, the technical scheme of the invention has the following beneficial technical effects: by the fixing action of the device, the vibration frequency of the prestressed tendon can be accurately tested, and the effective prestress can be calculated. Meanwhile, the device has the advantages of simple structure, small volume, economic manufacturing cost, small working platform required in use, convenient installation, use and maintenance and good engineering practical value.
Drawings
FIG. 1 is a schematic view of a U-shaped steel plate of the apparatus of the present invention;
FIG. 2 is a schematic view of a tendon securing plate of the apparatus of the present invention;
FIG. 3 is a schematic view of a nut, nut washer and set screw of the apparatus of the present invention;
FIG. 4 is a schematic view of the connecting screw of the apparatus of the present invention;
FIG. 5 is a schematic view of a sensor of the apparatus of the present invention;
FIG. 6 is a schematic of the dispensing of the apparatus of the present invention;
FIG. 7 is a self-contained schematic view of the apparatus of the present invention;
wherein: the device comprises a 1-U-shaped steel plate, a 2-prestressed tendon fixing piece, 31, 32-nuts, 4-nut gaskets, 5-fixing screws, 6-sensors, 7-connecting screws and 8-prestressed tendons.
Detailed Description
The technical solution of the present invention is further described below with reference to the accompanying drawings and examples.
The invention relates to an auxiliary device for testing the prestress of an external cable, which comprises a U-shaped steel plate 1, a prestressed tendon fixing piece 2, nuts 31 and 32, a nut gasket 4, a fixing screw rod 5, a sensor 6, a connecting screw rod 7 and a prestressed tendon 8, and is shown in figures 6 and 7.
The center of one side surface of the U-shaped steel plate 1 is provided with a through hole, and the aperture of the through hole is the same as the diameter of the fixing screw 5, as shown in figure 1. The prestressed tendon fixing piece 2 is an arc-shaped steel plate and is positioned on the U-shaped steel plate 1, the diameter of the arc of the prestressed tendon fixing piece is the same as that of the prestressed tendon 8, a cylindrical hole is formed in the outer side of the prestressed tendon fixing piece, and the hole does not penetrate through the prestressed tendon fixing piece 2, as shown in fig. 2. The diameter of the hole of the prestressed tendon fixing piece 2 is the same as that of the through hole of the U-shaped steel plate 1. The prestressed tendon 8 is positioned on the side surface of the U-shaped steel plate 1 without a through hole and is clamped with the prestressed tendon fixing piece 2 without relative sliding.
The outside of 5 one ends of set screw rods sets up the screw thread to the hole that passes 1 side of U shaped steel board and the cylindrical hole joint in the prestressing tendons stationary blade 2 outsides. The nut 31 and the nut washer 4 are screwed to the fixing screw 5. Make U shaped steel board 1, prestressing tendons stationary blade 2, prestressing tendons 8 reciprocal anchorage through nut 31, nut gasket 4, clamping screw 5, prevent that the device from taking place not hard up when 8 vibrations of prestressing tendons to influence the test effect. The other end of the fixed screw rod 5 is welded with a fixed nut 32, a section of pore channel is arranged in the fixed screw rod 5, and the inner wall of the pore channel is provided with threads. The nuts 31, 32, the nut washer 4 and the fixing screw 5 are shown in fig. 3.
A section of pore canal is arranged in the sensor 6, and the inner wall of the pore canal is provided with threads, as shown in fig. 5. The diameter and the length of the inner pore passage of the sensor 6 are the same as those of the inner pore passage of the fixing screw rod 5, and the sensor 6 and the fixing screw rod 5 are fixedly connected through a connecting screw rod 7. The outer surface of the connecting screw 7 is provided with threads, as shown in fig. 4, one end of the connecting screw is in threaded connection with the nut 32 and the inner hole of the fixing screw 5, and the other end of the connecting screw is in threaded connection with the inner hole of the sensor 6.
The installation and use principle of the device of the embodiment is as follows:
firstly, the prestressed tendon 8 is placed in the U-shaped steel plate 1, the prestressed tendon fixing piece 2 is contacted with the prestressed tendon 8, and the fixing screw 5 sequentially passes through the nut 31, the nut gasket 4 and the hole on the U-shaped steel plate 1 and is contacted with the cylindrical hole on the prestressed tendon fixing piece 2. The nut 32 at the end of the fixing screw 5 is rotated to bring the fixing screw 5 into contact with the tendon fixing piece 2 and fix it, and the nut 31 in contact with the nut washer 4 is tightened to further fix the device. One end of the connecting screw 7 is placed in the sensor 6 and screwed up in a rotating mode, so that the connecting screw 7 and the sensor 6 form a whole, and finally the other end of the connecting screw 7 and a pore channel in the fixing screw 5 are screwed up in a rotating mode, and therefore the whole device is connected and fixed. The dispensing process is shown in fig. 6(a) and 6(b), and the structure after the self-assembly is shown in fig. 7(a) and 7 (b).
After all the parts are fixedly connected, external excitation (such as knocking) or random excitation (such as wind load and vehicle running) is adopted, so that the prestressed tendons 8 vibrate, the vibration frequency is transmitted to the sensor 6 through the fixing screw rods 5 and the connecting screw rods 7, and then signals are recorded through corresponding acquisition equipment. And obtaining the effective prestress of the prestressed tendon through a calculation formula of the vibration frequency and the prestress of the prestressed tendon.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. It will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations can be made in the embodiments without departing from the spirit and scope of the invention.
Claims (5)
1. The utility model provides an external cable prestressing force test auxiliary device which characterized in that: the device comprises a U-shaped steel plate (1), a prestressed tendon fixing piece (2), a nut (31), a nut gasket (4), a fixing screw rod (5), a sensor (6), a connecting screw rod (7) and a prestressed tendon (8); a through hole is formed in the center of one side face of the U-shaped steel plate (1), and the diameter of the through hole is the same as that of the fixing screw rod (5); the prestressed tendon fixing piece (2) is an arc-shaped steel plate and is positioned on the U-shaped steel plate (1), the diameter of the arc of the prestressed tendon fixing piece is the same as that of the prestressed tendon (8), a cylindrical hole is formed in the outer side of the prestressed tendon fixing piece, and the hole does not penetrate through the prestressed tendon fixing piece (2); the diameter of the hole of the prestressed tendon fixing piece (2) is the same as that of the through hole of the U-shaped steel plate (1); the prestressed tendon (8) is positioned on the side surface of the U-shaped steel plate (1) which is not provided with the through hole, and is clamped with the prestressed tendon fixing piece (2) without relative sliding; the outer side of one end of the fixing screw rod (5) is provided with threads, and the threads penetrate through a hole in the side surface of the U-shaped steel plate (1) and are clamped with a cylindrical hole in the outer side of the prestressed tendon fixing piece (2); the nut (31) and the nut gasket (4) are in threaded connection with the fixed screw (5); the U-shaped steel plate (1), the prestressed tendon fixing piece (2) and the prestressed tendon (8) are fixed with each other through the nut (31), the nut gasket (4) and the fixing screw (5); a section of pore channel is arranged in the other end of the fixed screw rod (5), and the inner wall of the pore channel is provided with threads; a section of pore channel is arranged in the sensor (6), threads are arranged on the inner wall of the pore channel, the diameter and the length of the pore channel in the sensor (6) are the same as those of the pore channel in the fixing screw rod (5), and the sensor (6) and the fixing screw rod (5) are fixedly connected through a connecting screw rod (7); the outer surface of the connecting screw rod (7) is provided with threads, one end of the connecting screw rod is in threaded connection with the inner hole channel of the fixing screw rod (5), and the other end of the connecting screw rod is in threaded connection with the inner hole channel of the sensor (6).
2. The auxiliary device for the external cable prestress test according to claim 1, wherein: and a fixing nut (32) is welded at the end part of the fixing screw rod (5) connected with the connecting screw rod (7), and the fixing nut (32) is in threaded connection with the connecting screw rod (7).
3. The auxiliary device for the external cable prestress test according to claim 1, wherein: the length and the diameter of the fixed screw rod (5) are adjusted according to the diameter and the frequency of the prestressed tendon (8).
4. An extra-corporeal cable pre-stress test aid as claimed in claim 1, 2 or 3, characterised in that: a protective sleeve is arranged between the prestressed tendon (8) and the prestressed tendon fixing piece (2).
5. The auxiliary device for in-vitro cable prestress test according to claim 4, wherein: the protective sleeve is made of nylon, polyethylene or polypropylene.
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| CN201910670313.0A CN110455441B (en) | 2019-07-24 | 2019-07-24 | External cable prestressing force test auxiliary device |
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| CN201910670313.0A CN110455441B (en) | 2019-07-24 | 2019-07-24 | External cable prestressing force test auxiliary device |
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| CN110455441A CN110455441A (en) | 2019-11-15 |
| CN110455441B true CN110455441B (en) | 2021-06-01 |
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| CN113720516B (en) * | 2021-07-29 | 2024-02-13 | 福建建工基础设施建设集团有限公司 | Method for detecting effective pretension of prestressed tendons |
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