CN207923332U - A kind of round-the-clock cable force measurement device equipped with dog-ear otic placode - Google Patents
A kind of round-the-clock cable force measurement device equipped with dog-ear otic placode Download PDFInfo
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- CN207923332U CN207923332U CN201820242690.5U CN201820242690U CN207923332U CN 207923332 U CN207923332 U CN 207923332U CN 201820242690 U CN201820242690 U CN 201820242690U CN 207923332 U CN207923332 U CN 207923332U
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Abstract
The utility model discloses a kind of round-the-clock cable force measurement devices equipped with dog-ear otic placode；The utility model includes elastic rod, wide range surface strain meter, dog-ear otic placode, axis pin and rope head rim of a cup；The drag-line is connect with rope head rim of a cup, and rope head rim of a cup is connect with dog-ear otic placode；Dog-ear otic placode is formed by being connected with vertical section along symmetrically arranged a pair of of the otic placode bending segment of drag-line central axis；Two otic placode vertical sections of dog-ear otic placode are connected by axis pin；The otic placode bending segment of dog-ear otic placode forms angle α with horizontal direction, elastic rod is arranged in the bending place of dog-ear otic placode, elastic rod is equipped with wide range surface strain meter；It is 45 °~75 ° that the otic placode bending segment of dog-ear otic placode forms angle α value with horizontal direction.Utility model device is low-cost, high certainty of measurement, applied widely, and can carry out each stage, round-the-clock cable force measurement and health monitoring to Cable power.
Description
Technical field
The utility model is related to a kind of cable force measurement devices, and field of civil engineering is widely portable to more particularly to one kind
The round-the-clock cable force measurement device equipped with dog-ear otic placode.
Background technology
Along with the complication and diversification of new period structure type, drag-line has been widely used in all kinds of engineering structures
In, become the main bearing member in the civil infrastructures such as long span building structure and long-span bridge girder construction, pulling force is big
The small stress for directly affecting structure, while being also the important symbol of safety of structure, therefore, in civil infrastructure
The real-time measurement and health monitoring of key position Cable power are particularly significant also very necessary.
As shown in figure 3, the cable force measurement device of the prior art includes axis pin 5, rope head rim of a cup 6 and straight otic placode 7, two straight otic placodes
7 are arranged in parallel；In 6 upper end of rope head rim of a cup, drag-line 1 is connect with rope head rim of a cup 6, straight in 6 lower ends of rope head rim of a cup, two straight otic placodes 7 with
Rope head rim of a cup 6 connects, and otic placode 7 is also connected by axis pin 5 two-by-two.When generating pulling force in drag-line, there is only axis in straight otic placode 7
Power.When test, pass through the sensor test Suo Li being arranged on drag-line 1.
Substantially there are following 5 kinds using relatively wide cable force measurement method in Practical Project at this stage.
1, hydraulic jack stretching measurement method：
This method is suitable for cable tension shaping stage, and engineer can be read approximate true by the oil meter of hydraulic jack
Determine the Suo Li numerical value of drag-line, this method is simple, and cost is relatively low.But oil pressure gauge works as rope there are throw of pointer excessive velocities
Pointer shakes the unfavorable factors such as violent when power numerical value is larger.In addition, under structure normal operating condition, jack has logged out work
Make, cannot be used for Suo Li all the period of time in this approach monitors.
2, pressure sensor method of testing：
When drag-line is constructed, by pressure sensor be mounted between anchorage and drag-line gasket, in rope the variation of pulling force can draw
The deformation for playing pressure sensor elastomer, deformation can be converted to accessible electricity by built-in pressure sensor in sensor
Signal (being equivalent to one piece of piezoresistive element) or optical signal etc., then Suo Li numbers can be measured by electrooptical device processing
Value.This method complex process, testing cost is higher, and the endurance quality of sensor under field conditions (factors) cannot be guaranteed.Mesh
It is preceding mainly to be influenced building beauty since sensor general size is larger with fields such as large bridge construction monitorings, therefore seldom used
In building field.
3, the test method based on structural vibration frequency：
This method is suitable for existing structure, under artificial or arbitrary excitation, passes through the sensor being arranged on drag-line
Corresponding vibration signal is obtained, the vibration frequency of drag-line is solved by spectrum analysis, recycles and is deposited between vibration frequency and Suo Li
Functional relation obtain cable tension numerical value.Testing cost needed for this method is low, and precision can meet engine request.But
It is that test process is cumbersome, single test period is longer, the easy tension cable span of precision, gradient, sag and the boundary of test data
The restriction of the multinomial condition such as condition is not used to the monitoring of construction stage Suo Li, is not also suitable for round-the-clock cable force monitoring.
4, magnetic flux method of testing：
This method is to carry out cable force measurement using the relationship between Cable power and sensor magnetic flux change.In sensor
Current strength is related to ferromagnetic material magnetic conductivity, and magnetic conductivity is related to itself stress state, therefore can pass through sensor
Existing respective function relational expression acquires Suo Li numerical value between voltage and stress in system.Any one ferromagnetic material is required for
The experiment for carrying out array stress, temperature in laboratory in advance determines that relational expression between magnetic flux change and Suo Li just can be into
The Cable power of this kind of material manufacture of row, therefore is unable to measure Cable power in built engineering, this method be affected by temperature it is larger,
It must carry out corresponding temperature-compensating.
5, adhesion type fiber-optic grating sensor measuring method：
The elongation of a specific bid section inhaul is measured using the fiber-optic grating sensor being firmly attached on drag-line, then
The Suo Li numerical value of drag-line is acquired using the relationship between drag-line rigidity, strain, stress.This method testing expense is high, measures essence
Degree is influenced by temperature and fiber grating stiffness by itself, and test system is more complex, easily impaired at the construction field (site), is used at this stage
It is not very extensive.
Invention content
Based on inherent shortcoming existing for existing measuring technique, the purpose of this utility model is to provide it is a kind of meet it is existing
Each stage of cable force measurement requirement, round-the-clock cable force measurement device, the utility model test device have in Complex engineering structure
Quickly, feature efficiently, accurate.
Utility model device carries out overall improvement to the form of existing traditional Cable head, passes through simple force equation
The functional relation of elastic rod strain and Cable power can be acquired by deriving, therefore can quickly, efficiently and accurately calculate determining drawing
The Suo Li numerical value of rope.In addition, this method, which can be combined with pre- Zhang Gong sequence of the drag-line in processing assembling process, carries out calibration review.
To achieve the above object, the utility model adopts the following technical solution：
A kind of round-the-clock cable force measurement device equipped with dog-ear otic placode, including elastic rod, wide range surface strain meter, dog-ear
Otic placode, axis pin and rope head rim of a cup；The drag-line is connect with rope head rim of a cup, and rope head rim of a cup is connect with dog-ear otic placode；Dog-ear otic placode by
Composition is connected with vertical section along symmetrically arranged a pair of of the otic placode bending segment of drag-line central axis；Two otic placode vertical sections of dog-ear otic placode
It is connected by axis pin；The otic placode bending segment of dog-ear otic placode forms angle α with horizontal direction, and bullet is arranged in the bending place of dog-ear otic placode
Property bar, elastic rod be equipped with wide range surface strain meter；The otic placode bending segment of dog-ear otic placode forms angle α value with horizontal direction
It is 45 °~75 °.
To further realize the utility model aim, it is preferable that the wide range surface strain is calculated as DP-4000 optical fiber
Grating wide range surface strain meter.
Preferably, the wide range surface strain meter is arranged in the central point lower surface of elastic rod or upper surface.
Preferably, the material of the elastic rod is steel.
Preferably, it is 60 °~70 ° that the otic placode bending segment of the dog-ear otic placode forms angle α value with horizontal direction.
Preferably, the material of the dog-ear otic placode is steel.
Using the round-the-clock cable force measurement method of above-mentioned apparatus：The total Suo Li F of drag-lineAlwaysAs obtained by formula (7) calculating：
Wherein, ε is elastic rod axial strain, is measured by wide range surface strain；E is elastic rod steel elasticity modulus,
I(1)For otic placode bending segment the moment of inertia, A(1)For otic placode bending segment sectional area, α is the angle of otic placode bending segment and horizontal direction, and k is
Elastic rod equivalent spring rigidity, A(2)For elastic rod area, L is the vertical intersegmental distance of otic placode, and h is that otic placode bending segment is vertical
Projected length, X1For elastic rod axial compressive force, p is to cause the axle power on monolithic otic placode, δ by Suo Li F11For otic placode bending segment with
The A points of elastic rod connection are in elastic rod axial compressive force X1Displacement under effect in the horizontal direction, Δ1pFor otic placode bending segment and bullet
Property bar connection A points under axle power P effect in the horizontal direction on displacement, I is otic placode cross sectional moment of inertia.
Preferably, the experiment relationship song between stable elastic rod strain stress and Cable power F is being obtained according to formula (7)
After line, then theoretical curve obtained by formula (7) is checked and demarcated.
Compared with the existing technology, the utility model has the characteristics that and advantageous effect：
1) round-the-clock data monitoring of each stage：Since strain gauge is arranged in inside tapered end for a long time, when can export arbitrary in real time
The strain data at quarter, therefore the utility model is applicable not only to the cable force measurement of work progress, it can also be to normal operating condition
In drag-line carry out dynamical health monitoring, the structure security alerting system of engineering structure can also be used for according to this feature.
2) of low cost：The utility model only need to do ingenious improvement to traditional rope head, add a root timber homogeneous in addition
Elastic bar and the strain gauge of respective model can be obtained measurement data, without expending additional manpower and materials, therefore measure
Cost is cheap compared with other schemes.
3) the utility model is theoretical clearly, calculation formula is succinct, and the simple direct, measurement accuracy of Path of Force Transfer can inside device
To meet requirement of engineering, and it is smaller by extraneous factor interference.
4) measurement period is short：This method need to only read the numerical value on elastic bar in strain gauge, you can substitute into above-mentioned formula
It obtains Cable power numerical value, the measurement method of complex instrument equipment is needed compared to other, the consuming time is short, and measurement efficiency is high.
For quick obtaining Suo Li numerical value, wired or wireless transmission technology external data processing center can also be utilized, analysis in real time measures
Data.
5) durability is good：Rope head own face has anticorrosive coating film, strain gauge itself also to have stronger anti-corrosion function, even if
It works in an outdoor environment, which can also be guaranteed.
6) since strain gauge can generally carry out internal auto thermal compensation, so calculating the Suo Li of drag-line with this method
When can not consider the measurement error caused by temperature change.
Description of the drawings
Fig. 1 is the front view of the round-the-clock cable force measurement device of the utility model.
Fig. 2 is the side view of the round-the-clock cable force measurement device of the utility model.
Fig. 3 is the front view of prior art cable force measurement device.
Fig. 4 is that the drag-line of the round-the-clock cable force measurement devices of Fig. 1 simplifies calculating schematic diagram.
Fig. 5 is the basic half hitch composition of force method of the round-the-clock cable force measurement devices of Fig. 1.
It is shown in figure：It is drag-line 1, elastic rod 2, wide range surface strain meter 3, dog-ear otic placode 4, axis pin 5, rope head rim of a cup 6, straight
Otic placode 7.
Specific implementation mode
To more fully understand the utility model, the utility model is described further below in conjunction with the accompanying drawings, but this reality
It is unlimited so with novel embodiment.
As illustrated in fig. 1 and 2, a kind of round-the-clock cable force measurement device equipped with dog-ear otic placode, including elastic rod 2, wide range
Surface strain meter 3, dog-ear otic placode 4, axis pin 5 and rope head rim of a cup 6；Drag-line 1 is connect with rope head rim of a cup 6, rope head rim of a cup 6 and dog-ear ear
Plate 4 connects；Dog-ear otic placode 4 is formed by being connected with vertical section along the symmetrically arranged otic placode bending segment of 1 central axis of drag-line；Dog-ear ear
Two otic placode vertical sections of plate 4 are connected by axis pin 5；The otic placode bending segment of dog-ear otic placode 4 forms angle α with horizontal direction, is rolling over
Elastic rod 2 is arranged in the bending place of angle otic placode 4, and elastic rod 2 is equipped with wide range surface strain meter 3；Otic placode bending segment and level side
It it is 45 °~75 ° to angle α value is formed.Preferably, the otic placode bending segment of the dog-ear otic placode forms angle α with horizontal direction
Value is 60 °~70 °.
As shown in figure 3, in engineering structure, the otic placode of traditional Cable head, which is usually that biplate is parallel, to be shelved, when in drag-line
When generating pulling force, there is only axle powers in straight otic placode 7.The round-the-clock cable force measurement device of the utility model is the structure to traditional otic placode
Appearance formula is improved gained, i.e., the straight otic placode 7 that the prior art uses is changed to fold-line-shaped, and then form improved dog-ear ear
Plate 4, and the uniform elastic rod of material 2 is installed between two otic placodes.In the present invention, when generating pulling force in drag-line, pulling force
Dog-ear otic placode 4 can be passed to by rope head rim of a cup 6 immediately, since otic placode is no longer placed in parallel at this time, under a stretching force,
Elastic rod 2 can generate elastic rod compressive strain ε due to the effect by axial compressive force.Dog-ear otic placode 4 and elastic rod 2 can regard reason as
Think elastomer, therefore there is corresponding ideal functional relations between elastic rod compressive strain ε and Cable power F, you can by this
The strain data of perfect elasticity bar acquires corresponding Suo Li numerical value.
Preferably, the wide range surface strain meter is arranged in the central point lower surface of elastic rod or upper surface.
Preferably, the material of the elastic rod is steel.The material of the dog-ear otic placode is steel.
As shown in Figure 4,5, mechanics is done to rope power apparatus according to symmetry and simplifies calculating, it can by simple structure mechanics principle
With the functional relation being derived by between elastic rod strain stress and Cable power F.
According to calculation diagram (Fig. 4), Force Method Equation can be obtained：
In X1Under effect, A points are in X1The displacement in direction：
Under axle power p effects, A points are in X1The displacement in direction：
Formula (2), (3) are brought into (1), are obtained：
In above formula：ε is elastic rod axial strain, and E is elastic rod steel elasticity modulus, I(1)It is used for otic placode bending segment
Property square, A(1)For otic placode bending segment sectional area, α is the angle of otic placode bending segment and horizontal direction, and k is that elastic rod equivalent spring is rigid
Degree, A(2)For elastic rod area, L is the vertical intersegmental distance of otic placode, and h is otic placode bending segment vertical projection length, X1For elasticity
Bar axial compressive force, p are to cause the axle power on monolithic otic placode, δ by Suo Li F11Exist for the A points that otic placode bending segment is connect with elastic rod
Elastic rod axial compressive force X1Displacement under effect in the horizontal direction, Δ1pThe A points being connect with elastic rod for otic placode bending segment are in rope
Under power P effect in the horizontal direction on displacement, I is otic placode cross sectional moment of inertia.
When generating pulling force F in drag-line, the transmission path of stay cable end power is：6 → otic placode of drag-line 1 → rope head rim of a cup 4, bullet
2 → axis pin of property bar 5.According to the transmission path of power, can be pushed away by simple mechanical analysis 2 strain stress of elastic rod and 4 axle power P of otic placode it
Between there are following functional relations, i.e.,：
The total Suo Li F of drag-line can be obtained by symmetryAlways, i.e.,：
The utility model can select corresponding wide range surface strain meter to measure answering for elastic rod 2 according to practical Suo Li numerical value
Become ε, such as the DP-4000 fiber grating wide range surface strain meters that the utility model recommends.The strain gauge carries temperature
Compensation device can eliminate measurement error caused by elastic pressure bar is changed by own temperature, improve the measurement accuracy of the invention.
And since the strain gauge has anticorrosive coating film, possess preferable anti-corrosion function, therefore can be widely used for various metals or other
Solid structure surface carries out a wide range of ess-strain monitoring of static and dynamic.
The model strain gauge can be directly welded in elastic pressure bar surface, or be encapsulated in the inside of hollow compression bar.In practical survey
During amount, strain gauge measurement data ε can be directly read, substitutes into formula (7) acquire Cable power numerical value F immediatelyAlways。
Every finished product rope must pass through the pre- tensioning being repeated several times to eliminate the initial imperfection in cable body before manufacture.To obtain
More accurate data are obtained, multigroup answer can also be acquired to every finished product rope using utility model device in the process stages
Change-pulling force related data.After obtaining the experiment relation curve between stable elastic rod strain stress and Cable power F, then to public affairs
Theoretical curve is checked and is demarcated obtained by formula (7), to ensure the accuracy, science and practicability of measurement data.
Claims (6)
1. a kind of round-the-clock cable force measurement device equipped with dog-ear otic placode, which is characterized in that answered including elastic rod, wide range surface
Become meter, dog-ear otic placode, axis pin and rope head rim of a cup；Drag-line is connect with rope head rim of a cup, and rope head rim of a cup is connect with dog-ear otic placode；Dog-ear ear
Plate is formed by being connected with vertical section along symmetrically arranged a pair of of the otic placode bending segment of drag-line central axis；Two otic placodes of dog-ear otic placode are perpendicular
Straight section is connected by axis pin；The otic placode bending segment of dog-ear otic placode forms angle α with horizontal direction, is set in the bending place of dog-ear otic placode
Elastic rod is set, elastic rod is equipped with wide range surface strain meter；The otic placode bending segment of dog-ear otic placode forms angle α with horizontal direction
Value is 45 °~75 °.
2. the round-the-clock cable force measurement device according to claim 1 equipped with dog-ear otic placode, it is characterised in that：Described is big
Range surface strain gauge is DP-4000 fiber grating wide range surface strain meters.
3. the round-the-clock cable force measurement device according to claim 1 equipped with dog-ear otic placode, it is characterised in that：It is described a large amount of
Journey surface strain meter is arranged in the central point lower surface of elastic rod or upper surface.
4. the round-the-clock cable force measurement device according to claim 1 equipped with dog-ear otic placode, it is characterised in that：The elasticity
The material of bar is steel.
5. the round-the-clock cable force measurement device according to claim 1 equipped with dog-ear otic placode, it is characterised in that：The dog-ear
It is 60 °~70 ° that the otic placode bending segment of otic placode forms angle α value with horizontal direction.
6. the round-the-clock cable force measurement device according to claim 1 equipped with dog-ear otic placode, it is characterised in that：The dog-ear
The material of otic placode is steel.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108267255A (en) * | 2018-02-09 | 2018-07-10 | 华南理工大学建筑设计研究院 | A kind of round-the-clock cable force measurement device and measuring method |
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2018
- 2018-02-09 CN CN201820242690.5U patent/CN207923332U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108267255A (en) * | 2018-02-09 | 2018-07-10 | 华南理工大学建筑设计研究院 | A kind of round-the-clock cable force measurement device and measuring method |
| CN108267255B (en) * | 2018-02-09 | 2023-12-08 | 华南理工大学建筑设计研究院有限公司 | All-weather cable force measuring device and method |
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Address after: 510640 Design Institute Building, South China University of Technology, Tianhe District, Guangzhou City, Guangdong Province Patentee after: South China University of Technology Architectural Design Research Institute Co., Ltd. Address before: 510640 Tianhe District, Guangdong, No. five road, No. 381, Patentee before: Architectural Design Research Institute of SCUT |
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