CN110455441A - A kind of external tendon prestressing force testing auxiliary device - Google Patents
A kind of external tendon prestressing force testing auxiliary device Download PDFInfo
- Publication number
- CN110455441A CN110455441A CN201910670313.0A CN201910670313A CN110455441A CN 110455441 A CN110455441 A CN 110455441A CN 201910670313 A CN201910670313 A CN 201910670313A CN 110455441 A CN110455441 A CN 110455441A
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- presstressed reinforcing
- reinforcing steel
- screw
- nut
- diameter
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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
-
- 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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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
- Reinforcement Elements For Buildings (AREA)
Abstract
The invention discloses a kind of external tendon prestressing force testing auxiliary device, including U-shaped steel plate, presstressed reinforcing steel fixinig plate, nut, nut shim, standing screw, sensor, connecting screw, presstressed reinforcing steels.U-shaped steel plate is equipped with perforation, and aperture is the same as standing screw diameter.The presstressed reinforcing steel fixinig plate is curved plate, and the same presstressed reinforcing steel of arc diameter, outside is provided with identical as U-shaped steel plate penetration hole diameter but not perforative hole.Screw thread is set on the outside of standing screw one end and fixation is tightened by nut and nut shim and U-shaped steel plate, a hole road is set inside the other end, duct inner wall is provided with screw thread.The duct of sensor internal setting and standing screw same diameter and length.Screw thread is arranged in connecting screw surface, and diameter is identical as sensor internal duct, and sensor and standing screw are fixed by connecting screw.The present invention can accurately test the vibration frequency of presstressed reinforcing steel, cost economic, and convenient maintenance has good engineering practical value.
Description
Technical field
The invention belongs to bridge machinery, monitoring technology field more particularly to a kind of external tendon prestressing force testing auxiliary devices.
Background technique
In the existing highway bridge in China, there are a large amount of bridges after the operation of many years, bearing capacity has been unable to meet day
The requirement of beneficial increment of traffic, when bridge structure spaning middle section does not allow to occur tensile stress or institute's tension stress transfinites, often
It needs to apply prestressing force to be reinforced.Common prestressed consolidation technology is external prestressed strengthening method.
External prestressed strengthening method is inconsistent with concrete deformation since external prestressing steels are deformed, and be easy to cause prestressing force
Loss, therefore the effective prestress value of in-service external prestressing steels is detected for fully understanding that Bridge performance has
Important realistic meaning and engineering practical value.Common externally cable prestress detection method has frequency test method, and principle is
According to the deterministic dependence of steel beam prestress value and frequency, the effective prestress of steel beam is calculated indirectly by tested steel beam frequency
Value.Currently, bridge machinery, the existing frequency test subtraction unit majority structural principle of monitoring are complicated, prestressing force can not be quickly tested
Muscle frequency values calculate effective prestress.
Summary of the invention
Goal of the invention: in order to solve apparatus structure principle complexity during said frequencies method test externally cable prestressing force, nothing
Method quickly tests presstressed reinforcing steel frequency values and calculates effective prestress engineering technology problem, and the present invention proposes a kind of external tendon prestressing force
Testing auxiliary device, accurately tests the vibration frequency of presstressed reinforcing steel, cost economic, and convenient maintenance has good
Engineering practical value.
Technical solution: to achieve the purpose of the present invention, the technical scheme adopted by the invention is that: a kind of external tendon prestressing force
Testing auxiliary device, including U-shaped steel plate 1, presstressed reinforcing steel fixinig plate 2, nut 31, nut shim 4, standing screw 5, sensor 6,
Connecting screw 7, presstressed reinforcing steel 8.
The 1 one side center of U-shaped steel plate is equipped with perforation, and aperture is identical as 5 diameter of standing screw.The presstressed reinforcing steel
Fixinig plate 2 is curved plate, is located on U-shaped steel plate 1, and arc diameter is identical as 8 diameter of presstressed reinforcing steel, and outside is provided with circle
The cylindrical bore and hole does not run through presstressed reinforcing steel fixinig plate 2.The hole diameter of presstressed reinforcing steel fixinig plate 2 is worn with U-shaped steel plate 1
Bore dia is identical.Presstressed reinforcing steel 8 is located at the side of the not set perforation of U-shaped steel plate 1, and is clamped with presstressed reinforcing steel fixinig plate 2, does not produce
Raw opposite sliding.
Screw thread is set on the outside of described 5 one end of standing screw, and passes through hole and the presstressed reinforcing steel fixinig plate 2 of 1 side of U-shaped steel plate
The cylindrical cavity in outside is clamped.Nut 31 and nut shim 4 are threadedly coupled with standing screw 5.Pass through nut 31, nut shim
4, standing screw 5 makes U-shaped steel plate 1, presstressed reinforcing steel fixinig plate 2, presstressed reinforcing steel 8 be fixed to each other, and prevents from vibrating in presstressed reinforcing steel 8
When device occur loosen influence test effect.One hole road is set inside 5 other end of standing screw, and duct inner wall is provided with spiral shell
Line.
The sensor 6 is internally provided with a hole road, and duct inner wall is provided with screw thread, 6 internal gutter of sensor and solid
Diameter and the length for determining 5 internal gutter of screw rod are all the same, and sensor 6 is connected and fixed with standing screw 5 by connecting screw 7.Institute
It states 7 outer surface of connecting screw and is provided with screw thread, one end is threadedly coupled with the internal gutter of standing screw 5, the other end and biography
The internal gutter of sensor 6 is threadedly coupled.
Further, nut 32, fixture nut 32 and company is welded and fixed in 5 end of standing screw to connect with connecting screw 7
The threaded connection of screw rod 7 is connect, by synchronous rotary nut 32 and standing screw 5, operates the rotational fastener of standing screw 5 more square
Just.
Further, 5 length of standing screw and diameter are adjusted according to the diameter of external tendon, frequency, i.e., according to pre-
The diameter of stress rib 8, frequency are adjusted, and can reach expected test effect.
Further, protective case is set as needed between presstressed reinforcing steel 8 and presstressed reinforcing steel fixinig plate 2, it is pre- for preventing
Stress rib 8 is damaged.Preferably, the protective case material selection nylon, polyethylene or polypropylene.
Apparatus of the present invention by U-shaped steel plate 1, presstressed reinforcing steel fixinig plate 2, standing screw 5 in use, make presstressed reinforcing steel 8 exist
Whole device is kept fixed when vibrating, and guarantees the accuracy of frequency test.By pre- between presstressed reinforcing steel 8 and sensor 6
Stress rib fixinig plate 2, standing screw 5, connecting screw 7 connect, and the vibration of presstressed reinforcing steel 8 can pass through standing screw 5 and connection
Screw rod 7 is efficiently transferred to sensor 6.Simultaneously as the steel plate of present apparatus use, screw rod rigidity are far longer than presstressed reinforcing steel 8
Rigidity, according to the theory of Structural Dynamics, the frequency of the present apparatus is apparently higher than external tendon fundamental frequency, can guarantee frequency test
Accuracy.
The utility model has the advantages that compared with prior art, technical solution of the present invention has technical effect beneficial below: passing through this
The fixed function of invention device can relatively accurately test the vibration frequency of presstressed reinforcing steel, and then calculate effective prestress.
Apparatus of the present invention structure is simple simultaneously, small in size, cost economic, and required workbench is small when use, is easily installed, uses
And maintenance, there is good engineering practical value.
Detailed description of the invention
Fig. 1 is the U-shaped steel plate schematic diagram of apparatus of the present invention；
Fig. 2 is the presstressed reinforcing steel fixinig plate schematic diagram of apparatus of the present invention；
Fig. 3 is the nut, nut shim and standing screw schematic diagram of apparatus of the present invention；
Fig. 4 is the connecting screw schematic diagram of apparatus of the present invention；
Fig. 5 is the sensor schematic of apparatus of the present invention；
Fig. 6 is the packing schematic diagram of apparatus of the present invention；
Fig. 7 is the self-contained schematic diagram of apparatus of the present invention；
Wherein: 1-U shape steel plate, 2- presstressed reinforcing steel fixinig plate, 31,32- nut, 4- nut shim, 5- standing screw, 6- are passed
Sensor, 7- connecting screw, 8- presstressed reinforcing steel.
Specific embodiment
Further description of the technical solution of the present invention with reference to the accompanying drawings and examples.
A kind of external tendon prestressing force testing auxiliary device of the present invention, as shown in Figure 6, Figure 7, including U-shaped steel plate 1,
Presstressed reinforcing steel fixinig plate 2, nut 31,32, nut shim 4, standing screw 5, sensor 6, connecting screw 7, presstressed reinforcing steel 8.
The 1 one side center of U-shaped steel plate is equipped with perforation, and aperture is identical as 5 diameter of standing screw, as shown in Figure 1.Institute
Stating presstressed reinforcing steel fixinig plate 2 is curved plate, is located on U-shaped steel plate 1, and arc diameter is identical as 8 diameter of presstressed reinforcing steel, outside
Side is provided with cylindrical cavity and the hole does not run through presstressed reinforcing steel fixinig plate 2, as shown in Figure 2.The hole of presstressed reinforcing steel fixinig plate 2
Hole dia is identical as the penetration hole diameter of U-shaped steel plate 1.Presstressed reinforcing steel 8 is located at the side of the not set perforation of U-shaped steel plate 1, and with answer in advance
Power muscle fixinig plate 2 is clamped, and is not produced relative sliding.
Screw thread is set on the outside of described 5 one end of standing screw, and passes through hole and the presstressed reinforcing steel fixinig plate 2 of 1 side of U-shaped steel plate
The cylindrical cavity in outside is clamped.Nut 31 and nut shim 4 are threadedly coupled with standing screw 5.Pass through nut 31, nut shim
4, standing screw 5 makes U-shaped steel plate 1, presstressed reinforcing steel fixinig plate 2, presstressed reinforcing steel 8 be fixed to each other, and prevents from vibrating in presstressed reinforcing steel 8
When device occur loosen influence test effect.Nut 32 is welded and fixed in 5 other end of standing screw, and in the inside of standing screw 5
One hole road is set, and duct inner wall is provided with screw thread.Nut 31,32, nut shim 4 and standing screw 5 are as shown in Figure 3.
The sensor 6 is internally provided with a hole road, and duct inner wall is provided with screw thread, as shown in Figure 5.In sensor 6
Portion duct and the diameter and length of 5 internal gutter of standing screw are all the same, and sensor 6 is connected with standing screw 5 by connecting screw 7
Connect fixation.7 outer surface of connecting screw is provided with screw thread, as shown in figure 4, one end and nut 32 and standing screw 5
Internal gutter is threadedly coupled, and the other end is threadedly coupled with the internal gutter of sensor 6.
The installation of the present embodiment device and use principle are as follows:
Firstly, presstressed reinforcing steel 8 is placed in U-shaped steel plate 1, contact presstressed reinforcing steel fixinig plate 2 with presstressed reinforcing steel 8, it will
Standing screw 5 sequentially passes through the circle on the Kong Bingyu presstressed reinforcing steel fixinig plate 2 on nut 31, nut shim 4 and U-shaped steel plate 1
Cylindrical bore contact.The nut 32 that rotation is located at 5 end of standing screw contacts standing screw 5 simultaneously with presstressed reinforcing steel fixinig plate 2
It is fixed, it tightens the nut 31 contacted with nut shim 4 and further fixes device.7 one end of connecting screw is placed in inside sensor 6
And rotate and tighten, so that connecting screw 7 and sensor 6 is formed an entirety, finally by the other end and standing screw of connecting screw 7
Duct rotation inside 5 is tightened, and so far, whole device has been connected and fixed completion.Wherein, process such as Fig. 6 (a), Fig. 6 are dispensed
(b) shown in, it is self-contained after the completion of structure such as Fig. 7 (a), Fig. 7 (b) shown in.
After above-mentioned each component is fixedly connected, using external drive (as tapped) or arbitrary excitation (such as wind load, vehicle row
Sail), so that presstressed reinforcing steel 8 is generated vibration, vibration frequency is transmitted to sensor 6 by standing screw 5 and connecting screw 7, then passes through
Corresponding acquisition equipment tracer signal.It is effective that with the prestressed calculation formula of presstressed reinforcing steel presstressed reinforcing steel is obtained by vibration frequency
Prestressing force.
Detailed description is made that embodiments of the present invention in conjunction with attached drawing above, but the present invention be not limited to it is described
Embodiment.For those of ordinary skill in the art, in the range of the principle of the present invention and technical idea, to these realities
The mode of applying carries out a variety of variations, modification, replacement and deformation and still falls in protection scope of the present invention.
Claims (5)
1. a kind of external tendon prestressing force testing auxiliary device, it is characterised in that: the device includes U-shaped steel plate (1), and presstressed reinforcing steel is solid
Stator (2), nut (31), nut shim (4), standing screw (5), sensor (6), connecting screw (7), presstressed reinforcing steel (8)；Institute
It states U-shaped steel plate (1) one side center and is equipped with perforation, aperture is identical as standing screw (5) diameter；The presstressed reinforcing steel fixinig plate
(2) it is curved plate, is located on U-shaped steel plate (1), arc diameter is identical as presstressed reinforcing steel (8) diameter, and outside is provided with circle
Cylindrical bore and the hole do not run through presstressed reinforcing steel fixinig plate (2)；The hole diameter and U-shaped steel plate of presstressed reinforcing steel fixinig plate (2)
(1) penetration hole diameter is identical；Presstressed reinforcing steel (8) is located at the side of U-shaped steel plate (1) not set perforation, and fixes with presstressed reinforcing steel
Piece (2) clamping, does not produce relative sliding；Screw thread is set on the outside of described standing screw (5) one end, and passes through U-shaped steel plate (1) side
Hole and presstressed reinforcing steel fixinig plate (2) on the outside of cylindrical cavity be clamped；Nut (31) and nut shim (4) and standing screw
(5) it is threadedly coupled；Make U-shaped steel plate (1), presstressed reinforcing steel fixinig plate by nut (31), nut shim (4), standing screw (5)
(2), presstressed reinforcing steel (8) is fixed to each other；One hole road is set inside standing screw (5) other end, and duct inner wall is provided with screw thread；
The sensor (6) is internally provided with a hole road, and duct inner wall is provided with screw thread, sensor (6) internal gutter and fixed spiral shell
The diameter and length of bar (5) internal gutter are all the same, and sensor (6) is connect with standing screw (5) by connecting screw (7) solid
It is fixed；Connecting screw (7) outer surface is provided with screw thread, and one end is threadedly coupled with the internal gutter of standing screw (5), another
One end is threadedly coupled with the internal gutter of sensor (6).
2. a kind of external tendon prestressing force testing auxiliary device according to claim 1, it is characterised in that: with connecting screw
(7) standing screw (5) end to connect is welded and fixed nut (32), and fixture nut (32) is threadedly coupled with connecting screw (7).
3. a kind of external tendon prestressing force testing auxiliary device according to claim 1, it is characterised in that: the standing screw
(5) length and diameter is adjusted according to the diameter of presstressed reinforcing steel (8), frequency.
4. a kind of external tendon prestressing force testing auxiliary device according to claim 1 or 2 or 3, it is characterised in that: answering in advance
Protective case is set between power muscle (8) and presstressed reinforcing steel fixinig plate (2).
5. a kind of external tendon prestressing force testing auxiliary device according to claim 4, it is characterised in that: the protective case material
Material selects nylon, polyethylene or polypropylene.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910670313.0A CN110455441B (en) | 2019-07-24 | 2019-07-24 | External cable prestressing force test auxiliary device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910670313.0A CN110455441B (en) | 2019-07-24 | 2019-07-24 | External cable prestressing force test auxiliary device |
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| Publication Number | Publication Date |
|---|---|
| CN110455441A true CN110455441A (en) | 2019-11-15 |
| CN110455441B CN110455441B (en) | 2021-06-01 |
Family
ID=68483282
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910670313.0A Active CN110455441B (en) | 2019-07-24 | 2019-07-24 | External cable prestressing force test auxiliary device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113720516A (en) * | 2021-07-29 | 2021-11-30 | 福建建工基础设施建设集团有限公司 | Method for detecting effective pretension of prestressed tendon |
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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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