CN207751471U - The test system that detection end of the bridge differential settlement influences simply supported girder bridge shock effect - Google Patents
The test system that detection end of the bridge differential settlement influences simply supported girder bridge shock effect Download PDFInfo
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- CN207751471U CN207751471U CN201820377679.XU CN201820377679U CN207751471U CN 207751471 U CN207751471 U CN 207751471U CN 201820377679 U CN201820377679 U CN 201820377679U CN 207751471 U CN207751471 U CN 207751471U
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Abstract
The utility model discloses a kind of test systems that detection end of the bridge differential settlement influences simply supported girder bridge shock effect, are mainly made of displacement sensor, tachymeter, dynamic acquisition device and holder.For displacement sensor by rack arrangement in simply supported beam spaning middle section, displacement sensor is connected to collector by data line.The dynamic displacement of spaning middle section when passing through bridge floor using collector collection vehicle, analyzes collected dynamic displacement curve, using dynamic magnification factor and coverage as two evaluation indexes of simply supported girder bridge shock effect, establishes the quantization method of two indices.This system is applied to bridge machinery field, it can be achieved that the detection evaluation that end of the bridge differential settlement influences simply supported girder bridge shock effect, basic data is provided for bridge operation state check and evaluation.
Description
Technical field
The utility model is related to Bridge Inspections, and especially detecting end of the bridge differential settlement influences simply supported girder bridge shock effect
Test system.
Background technology
Bumping at bridge-head is a kind of phenomenon of present high-level highway generally existing, and producing cause is due to the Abutment Back way of escape
Roadbed and ground generate larger plastic deformation under carload and gravity load effect under face, and the basic rigidity of abutment compared with
Greatly, generated compressive deformation very little, to, due to the difference of rigidity, Non-uniform Settlement often occur between abutment and embankment,
Cause grade elevation to be mutated, cause vehicle by when generate jolt, this phenomenon is bumping at bridge-head.Bumping at bridge-head can be to bridge
Additional impact load is generated with road, accelerates the damage of abutment, transition slab at bridge head, bearing and expansion joint, bridges and culverts structure is caused to endanger
Evil, influences its normal working performance, and cause frequently to destroy with road surface junction to bridges and culverts.Therefore, comprehensive analysis and discussion
Problem of bumping at bridge-head proposes prevention bumping at bridge-head treatment measures, there is great theory and realistic meaning to highway in China construction.
Analysis is detected on end of the bridge differential settlement on the influence of simply supported girder bridge shock effect, obtains influence of the differential settlement to bridge shock effect
Specification is to study bumping at bridge-head Producing reason and the element task as how proposed treatment measures.From engineer application present situation
From the point of view of, the technological means for the test that effective end of the bridge differential settlement influences simply supported girder bridge shock effect is also lacked at present.
Invention content
The technical problem to be solved by the present invention is to provide a kind of detection end of the bridge differential settlements to simply supported girder bridge shock effect
The test system of influence.
In order to solve the above technical problems, the technical solution adopted in the utility model is：
Detection end of the bridge differential settlement test system that simply supported girder bridge shock effect is influenced, including displacement sensor, tachymeter,
Collector and mounting bracket, tachymeter are mounted on one end that freely-supported is built bridge, and displacement sensor is placed in simply supported beam by mounting bracket
Spaning middle section, tight against bridge bottom surface, installation reading is the half of range, and is passed by data for the telescopic end of displacement sensor
Defeated line is connect with collector.
Institute's displacement sensors are precision in 0.05mm or more, the dynamic pickup of range 100mm or more.
The collector is the dynamic acquisition device of frequency acquisition 10Hz or more.
The precision of the tachymeter is at 0.1 thousand ms/h or more, the speed for measuring bridge floor passage vehicle.
It is described that tracing analysis is carried out to collected bridge moving displacement curve, be：
Dynamic magnification factor is determined by dynamic displacement curve analysisμ, moving displacement curve maximum fluctuation value isf max, adjacent trough
Value isf min, dynamic magnification factorμComputational methods be：
μ=( f max -f min )/( f max +f min )；
Shock effect coverage is determined by dynamic displacement curve analysisl c, on dynamic displacement curve, by starting point to fluctuating width
Spending time for obviously becoming smaller ist c, the computational methods of shock effect coverage are：
l c =Vt c 。
For the existing technological means for lacking the test that effective end of the bridge differential settlement influences simply supported girder bridge shock effect
Problem, inventor utilize the test philosophy of bridge moving displacement, devise this test system, which is acquired using collector
The dynamic displacement of spaning middle section when vehicle passes through bridge floor, and collected dynamic displacement curve is analyzed, by dynamic magnification factor
And two evaluation indexes of the coverage as simply supported girder bridge shock effect, establish the quantization method of two indices.It will be of the invention
Applied to bridge machinery field, it can be achieved that end of the bridge differential settlement evaluates the detection that simply supported girder bridge shock effect influences, bridge is transported
It seeks state-detection assessment and basic data is provided.
Description of the drawings
Fig. 1 is the test system composition schematic diagram that end of the bridge differential settlement influences simply supported girder bridge shock effect.
Fig. 2 is that dynamic magnification factor and coverage calculate schematic diagram.
In figure：1 roadbed, 2 simply supported beams, 3 displacement sensors, 4 dynamic acquisition devices, 5 mounting brackets, 6 data lines, 7 survey
Fast instrument, 8 bridge floors passage vehicle.
Specific implementation mode
Embodiment：
As shown in Figure 1, the test system that the end of the bridge differential settlement of the utility model influences simply supported girder bridge shock effect, mainly
It is made of displacement sensor 3, tachymeter 7, dynamic acquisition device 4 and holder 5, displacement sensor 1 is arranged in simply supported beam by holder 5
2 spaning middle sections, for 1 telescopic end of displacement sensing tight against bridge bottom surface, the installation reading of displacement sensor 1 is the half or so of range；Position
Displacement sensor 1 is connected to dynamic collecting instrument 4 by data line 6.
It further illustrates the present invention and how to implement below by way of example：
（1）The displacement sensor of selected range 100mm installs displacement biography using mounting bracket at simply supported beam spaning middle section
Sensor, displacement sensing telescopic end should be half of range or so, tachymeter peace tight against bridge bottom surface, displacement sensor installation reading
Mounted in one end of simply supported beam（As shown in Figure 1）；
（2）The data line of displacement sensor is connected to dynamic collecting instrument, in bridge floor without vehicle pass-through, to displacement
Sensor reading is zeroed；
（3）When bridge floor passes through vehicle, displacement sensor reading is acquired in real time, and sample frequency is chosen for 20Hz, obtains vehicle
Bridge moving displacement curve under passage situation, while measuring using tachymeter the speed of current vehicleVIt is 20,000 ms/h；
（4）To collected bridge moving displacement curve（As shown in Figure 2）, tracing analysis is carried out, determines dynamic magnification factor
And coverage；
Dynamic magnification factor is determined by dynamic displacement curve analysisμ, moving displacement curve maximum fluctuation value isf max, adjacent trough
Value isf min, dynamic magnification factorμComputational methods be：
μ=( f max -f min )/( f max +f min )
Shock effect coverage is determined by dynamic displacement curve analysisl c, on dynamic displacement curve, by starting point to fluctuating width
Spending time for obviously becoming smaller ist c, the computational methods of shock effect coverage are：
l c =Vt c 。
By the way that vehicle pass-through is calculated in the case of end of the bridge differential settlement above to the amplification factor of impact dynamics of simply supported beamμWith
Coveragel c。
Test result is shown in Table 1.
1 test result of table
| fmax(mm) | fmin(mm) | Dynamic magnification factor | Vehicle velocity V (km/ hours) | tc(s) | lc(m) |
| 3.5 | 2.6 | 0.15 | 10 | 3.8 | 10.86 |
Claims (4)
1. the test system that detection end of the bridge differential settlement influences simply supported girder bridge shock effect, it is characterized in that：Including displacement sensor,
Tachymeter, collector and mounting bracket, tachymeter are mounted on one end that freely-supported is built bridge, and displacement sensor is placed in by mounting bracket
The spaning middle section of simply supported beam, for the telescopic end of displacement sensor tight against bridge bottom surface, installation reading is the half of range, and passes through
Data line is connect with collector.
2. test system according to claim 1, it is characterized in that：Institute's displacement sensors are precision in 0.05mm or more,
The dynamic pickup of range 100mm or more.
3. test system according to claim 1, it is characterized in that：The collector is the dynamic of frequency acquisition 10Hz or more
Collector.
4. test system according to claim 1, it is characterized in that：The precision of the tachymeter 0.1 thousand ms/h with
On, the speed for measuring bridge floor passage vehicle.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820377679.XU CN207751471U (en) | 2018-03-20 | 2018-03-20 | The test system that detection end of the bridge differential settlement influences simply supported girder bridge shock effect |
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| CN201820377679.XU CN207751471U (en) | 2018-03-20 | 2018-03-20 | The test system that detection end of the bridge differential settlement influences simply supported girder bridge shock effect |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110617928A (en) * | 2019-09-29 | 2019-12-27 | 浙江海洋大学 | In-service bridge bearing capacity evaluation method |
| CN110967466A (en) * | 2019-11-13 | 2020-04-07 | 鞍钢集团矿业有限公司 | Method for evaluating stability of goaf of stope |
| EP4040133A1 (en) | 2021-02-08 | 2022-08-10 | Christoph Lucks | Mobile detection of structural damage to girder bridge segments |
-
2018
- 2018-03-20 CN CN201820377679.XU patent/CN207751471U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110617928A (en) * | 2019-09-29 | 2019-12-27 | 浙江海洋大学 | In-service bridge bearing capacity evaluation method |
| CN110617928B (en) * | 2019-09-29 | 2021-08-10 | 浙江海洋大学 | In-service bridge bearing capacity evaluation method |
| CN110967466A (en) * | 2019-11-13 | 2020-04-07 | 鞍钢集团矿业有限公司 | Method for evaluating stability of goaf of stope |
| CN110967466B (en) * | 2019-11-13 | 2022-05-17 | 鞍钢集团矿业有限公司 | Method for evaluating stability of goaf of stope |
| EP4040133A1 (en) | 2021-02-08 | 2022-08-10 | Christoph Lucks | Mobile detection of structural damage to girder bridge segments |
| DE102021117200A1 (en) | 2021-02-08 | 2022-08-11 | Paul Bruhnsen | Mobile detection of structural damage to girder bridge segments |
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