CN208432379U - Bridge deflection test device - Google Patents

Abstract

The utility model provides a kind of bridge deflection test device, belongs to Bridge Health Monitoring Technology field.Including bracket, liquid storing barrel and liquid pipe, the first datum mark pressure sensor and the second datum mark pressure sensor are fixed on bracket, along several test point pressure sensors of the length direction arranged for interval of bridge to be measured, acceleration transducer is respectively and fixedly provided on each test point pressure sensor, first datum mark pressure sensor, the second datum mark pressure sensor, test point pressure sensor and acceleration transducer are connect with data acquisition device, and data acquisition device is connect with industrial personal computer.Measurement error caused by bridge deflection test device provided by the utility model can be eliminated because of bridge vibration drive measurement liquid vibration, test result are accurate.

Description

Bridge deflection test device

Technical field

The utility model belongs to Bridge Health Monitoring Technology field, is to be related to a kind of deflection of bridge span test more specifically Device.

Background technique

Bridge is the important component of traffic system, and safety generates tremendous influence to society.In recent years, with The many large bridges in China are built up successively, safe condition during one's term of military service more and more attention has been paid to.Amount of deflection be to bridge into One of the important indicator of row safety monitoring, it has reacted vertical deformation of the bridge under load action, in addition, passing through measurement bridge Deflection value, can also obtain periodically variable rule of impact coefficient, frequency of oscillation, bridge of load etc. indirectly, therefore right The monitoring of amount of deflection is extremely important.

Current practice is most widely connection tube method measurement amount of deflection, and the opening of deflection metrology is carried out according to liquid level Formula is connected to tube method and the closed communication tube method using pressure sensor, and being all made of liquid is measuring medium, due to liquid The characteristic of itself, when there is mobile load on bridge, bridge vibration of beam and the vibration of liquid are asynchronous, destroy pressure difference and amount of deflection it Between conversion relation, test result is inaccurate.

Utility model content

The purpose of this utility model is to provide a kind of bridge deflection test devices, it is intended to solve existing open communication When tube method and closed communication tube method measurement deflection of bridge span, it not can avoid since bridge vibration causes liquid vibration bring to be surveyed Try error, the inaccurate problem of test result.

In order to achieve the above purposes, the technical solution adopted by the utility model is: provides a kind of bridge deflection test device, packet It includes bracket, be fixed on the liquid pipe on bracket for accommodating the liquid storing barrel of measurement liquid and being connected to liquid storing barrel, be fixed on bracket The the first datum mark pressure sensor and the second datum mark pressure sensor being connect with liquid pipe, between the length direction of bridge to be measured It is respectively and fixedly provided with every on the test point pressure sensor for arranging that several connect with liquid pipe, each test point pressure sensor for surveying The acceleration transducer of bridge acceleration is tried, the first datum mark pressure sensor, the second datum mark pressure sensor, test press Force snesor and acceleration transducer are connect with the data acquisition device for collecting test data, data acquisition device and use It is higher than the first datum mark pressure sensing in the liquid level of measurement liquid in the industrial personal computer connection for calculating analysis data, liquid storing barrel The height of device, the second datum mark pressure sensor and test point pressure sensor installation site, the first datum mark pressure sensor The height of installation site is higher than the height of the second datum mark pressure sensor installation site.

Further, measurement liquid is water or silicone oil.

Further, launching in liquid storing barrel has the anti-icing fluid that can be mixed with measurement liquid.

Further, the free end of liquid pipe is equipped with tapping valve.

Further, bracket and bridge are equipped with passes with the first datum mark pressure sensor, the second benchmark point pressure respectively Sensor and the one-to-one fixing seat of test point pressure sensor, the first datum mark pressure sensor, the second benchmark point pressure pass Sensor and test point pressure sensor are individually fixed in fixing seat, and liquid pipe is sequentially connected in series several fixing seats.

Further, fixing seat is equipped with for across the liquid pipe hole of liquid pipe and the accommodating chamber being connected to liquid pipe hole, the One datum mark pressure sensor, the second datum mark pressure sensor or test point pressure sensor are mounted in accommodating chamber, fixed The bottom of seat is equipped with the bolt hole for being fixedly connected, and acceleration transducer and test point pressure sensor are fixed and be installed on appearance It receives intracavitary.

Further, fixing seat is equipped with the capping for sealing accommodating chamber, is equipped with and phase between adjacent fixing seat The elastic tracheae for the accommodating chamber connection answered, elastic tracheae are equipped with air valve, and fixing seat is equipped with for the tracheal orifice across tracheae, Tracheal orifice is connected to accommodating chamber.

Further, elastic tracheae is ethylene propylene diene rubber material product.

Further, liquid pipe be located at the part between liquid storing barrel and the first datum mark pressure sensor be equipped be used for air filtration The bubble removal device of bubble.

Further, bubble removal device includes filter chamber, at least one is fixed in filter chamber for filtering the mistake of bubble Strainer, filter chamber are equipped with the liquid inlet being connected to liquid pipe, and the liquid outlet being connected to liquid pipe, liquid inlet and liquid outlet set up separately in mistake The two sides of strainer.

The beneficial effect of bridge deflection test device provided by the utility model is: compared with prior art, this is practical New device secures the stand on ground or bridge pier not affected by vibration, and liquid storing barrel is fixed on bracket, and measurement liquid fills Full liquid storing barrel and the liquid pipe being connected to liquid storing barrel, along bracket, the downward and horizontal length direction along bridge extends liquid pipe, in liquid pipe The datum mark pressure sensor being fastened on bracket and the multiple test point pressure sensors being fixed on bridge, datum mark Not by bridge vibration influence, the liquid pipe at test point pressure sensor follows bridge vibration that position occurs for liquid pipe at pressure sensor It moves, meanwhile, the acceleration of bridge, acceleration at the acceleration transducer energy detection test points fixed with test point pressure sensor The displacement data that the bridge vibration data that sensor measures is measured with datum mark pressure sensor, test point pressure sensor passes through Data acquisition device is delivered to industrial personal computer and is analyzed, and industrial personal computer passes through to the acceleration signal in bridge dynamic time of vibration section Quadratic integral obtains dynamic deflection variation, to replace the Dynamic Signal of the pressure sensor measurement in the corresponding period, effectively disappears Except bridge vibration causes liquid level to vibrate and bring test error, the deflection value of bridge is accurately obtained, easy to operate, measurement essence Really.

Detailed description of the invention

Fig. 1 is the structural schematic diagram of bridge deflection test device provided by the embodiment of the utility model；

Fig. 2 is the partial structural diagram of datum mark pressure sensor in Fig. 1, fixing seat and bubble removal device；

Fig. 3 is the partial structural diagram of test point pressure sensor, acceleration transducer；

Fig. 4 is the structural schematic diagram of fixing seat in Fig. 1；

Fig. 5 is the schematic cross-sectional view of Fig. 4；

Fig. 6 is the structural schematic diagram of bubble removal device in Fig. 1.

In figure: 1, bracket；2, liquid storing barrel；3, liquid pipe；31, tapping valve；41, the first datum mark pressure sensor；42, second Datum mark pressure sensor；5, test point pressure sensor；51, acceleration transducer；6, data acquisition device；7, industrial personal computer； 8, fixing seat；81, accommodating chamber；82, liquid pipe hole；83, tracheal orifice；84, it covers；85, bolt hole；9, elastic tracheae；91, air valve； 10, bubble removal device；101, filter chamber；102, filter screen；103, liquid inlet；104, liquid outlet.

Specific embodiment

In order to which technical problem to be solved in the utility model, technical solution and beneficial effect is more clearly understood, with Lower combination accompanying drawings and embodiments, the present invention will be further described in detail.It should be appreciated that specific reality described herein It applies example to be only used to explain the utility model, is not used to limit the utility model.

It should be noted that it can be directly another when element is referred to as " being fixed on " or " being set to " another element On one element or indirectly on another element.When an element is known as " being connected to " another element, it can To be directly to another element or be indirectly connected on another element.

It is to be appreciated that term " length ", " width ", "upper", "lower", "front", "rear", "left", "right", "vertical", The orientation or positional relationship of the instructions such as "horizontal", "top", "bottom" "inner", "outside" is that orientation based on the figure or position are closed System, is merely for convenience of describing the present invention and simplifying the description, rather than the device or element of indication or suggestion meaning are necessary It with specific orientation, is constructed and operated in a specific orientation, therefore should not be understood as limiting the present invention.

In addition, term " first ", " second " are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance Or implicitly indicate the quantity of indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or Implicitly include one or more of the features.The meaning of " plurality " is two or two in the description of the present invention, More than, unless otherwise specifically defined.

Fig. 1, Fig. 2 and Fig. 3 are please referred to, now bridge deflection test device provided by the utility model is illustrated.Bridge Deflection test device including bracket 1, is fixed on bracket 1 and measures the liquid storing barrel 2 of liquid for accommodating and be connected to liquid storing barrel 2 Liquid pipe 3, be fixed with the first datum mark pressure sensor 41 and the second datum mark pressure sensing connecting with liquid pipe 3 on bracket 1 Device 42, along several test point pressure sensors 5 for being connect with liquid pipe 3 of the length direction arranged for interval of bridge to be measured, each survey The acceleration transducer 51 for testing bridge acceleration is respectively and fixedly provided on pilot pressure sensor 5, the first benchmark point pressure passes Sensor 41, the second datum mark pressure sensor 42, test point pressure sensor 5 and acceleration transducer 51 are surveyed with for collecting The data acquisition device 6 for trying data connects, and data acquisition device 6 is connect with the industrial personal computer 7 for calculating analysis data, liquid storing barrel The liquid level of measurement liquid is higher than the first datum mark pressure sensor 41, the second datum mark pressure sensor 42 and test in 2 The height of 5 installation site of force snesor is pressed, the height of 41 installation site of the first datum mark pressure sensor is higher than the second benchmark Press the height of 42 installation site of force snesor.

Compared with prior art, bracket 1 is fixed on ground or bridge pier not affected by vibration by utility model device, Liquid storing barrel 2 is fixed on bracket 1, and measurement liquid is full of liquid storing barrel 2 and the liquid pipe 3 being connected to liquid storing barrel, due to surveying in liquid storing barrel 2 The liquid level of quantity of fluid is higher than the first datum mark pressure sensor 41, the second datum mark pressure sensor 42 and test point pressure The height of 5 installation site of sensor, corresponding liquid pipe 3 extended downwardly from liquid storing barrel 2 with the first datum mark pressure sensor 41, The connection of second datum mark pressure sensor 42, and extend along the length direction of bridge to be measured and pressed with the test at each tested point Force snesor 5 connects, and the liquid pipe 3 at the first datum mark pressure sensor 41 and the second datum mark pressure sensor 42 is not by bridge Vibration influence, the liquid pipe 3 at test point pressure sensor 5 follow bridge vibration to be subjected to displacement, meanwhile, with test point pressure sensing The acceleration of bridge, the bridge shake that acceleration transducer 51 measures at the fixed 51 energy detection test points of acceleration transducer of device 5 Dynamic data and the first datum mark pressure sensor 41, the second datum mark pressure sensor 42, test point pressure sensor 5 measure Displacement data is delivered to industrial personal computer 7 by data acquisition device 6 and is analyzed, and industrial personal computer 7 passes through to bridge dynamic time of vibration Acceleration signal quadratic integral in section obtains dynamic deflection variation, to replace the pressure sensor measurement in the corresponding period Dynamic Signal effectively eliminates bridge vibration and liquid level is caused to vibrate and bring test error, accurately obtain the deflection value of bridge, grasps Facilitate, measurement is accurate.Data acquisition device 6 can be used DEWESoft distributed multi-channel acquisition system, the present embodiment not into Row limitation, industrial personal computer 7 can be used that state is general up to GPD-1115 or to grind magnificent IPC-610H etc., and the present embodiment is not limited.

The liquid level of liquid storing barrel 2 is higher than the first datum mark pressure sensor 41,42 and of the second datum mark pressure sensor Test point pressure sensor 5, measurement liquid can be by gravity stream liquid-in pipes 3；Pressure difference at least needs to be arranged two with reference in method A datum mark, and datum mark height it is different just can be carried out test, in the present embodiment, two benchmark test points are set.

Further, as a kind of specific embodiment of bridge deflection test device provided by the utility model, measurement Liquid is water or silicone oil.Measurement liquid can also be highdensity heavy-fluid, for example be configured by the salting liquid of high-dissolvability, coagulate Between -20 DEG C to -5 DEG C, freezing point is low for solid point, non-corrosive to components such as stainless steel, copper, nylon, rubber.

Further, as a kind of specific embodiment of bridge deflection test device provided by the utility model, liquid storage Launching in bucket 2 has the anti-icing fluid that can be mixed with measurement liquid.Measurement liquid needs can work in certain temperature range, and mixing is anti- It is good to freeze the later measurement liquid fluidity of liquid, can prevent measurement liquid winter from freezing and preventing cooling corrosion storage Liquid bucket 2 and liquid pipe 3.

Further, referring to Fig. 1, a kind of specific implementation as bridge deflection test device provided by the utility model The free end of mode, liquid pipe 3 is equipped with tapping valve 31.When carrying out test preparation, the measurement liquid in liquid storing barrel is needed full of liquid Pipe 3 flows in liquid pipe 3 to help to measure liquid, and the end of liquid pipe 3 needs to be communicated with the atmosphere；Meanwhile liquid is measured in liquid In pipe 3 when flowing, facilitates the outside that the intracorporal bubble of liquid is flowed to liquid pipe 3 with measurement liquid, prevent aeration from testing Precision keeps test result more accurate.

Further, referring to Fig. 1, a kind of specific implementation as bridge deflection test device provided by the utility model Mode, bracket 1 and bridge be equipped with respectively with the first datum mark pressure sensor 41, the second datum mark pressure sensor 42 and survey The one-to-one fixing seat 8 of pilot pressure sensor 5, the first datum mark pressure sensor 41, the second datum mark pressure sensor 42 and test point pressure sensor 5 be individually fixed in fixing seat 8, liquid pipe 3 is sequentially connected in series several fixing seats 8.Liquid pipe 3 can lead to It crosses press strip to be pressed at test point, press strip is bolted, and the first datum mark pressure sensor 41, the second benchmark point pressure pass Sensor 42 and 5 grafting of test point pressure sensor are bundled in liquid pipe 3；Fixing seat 8 provided in this embodiment is bolted On bracket 1 and bridge, liquid pipe 3 interts fixing seat 8 and mistake, the first datum mark pressure sensor 41, the second benchmark point pressure pass Sensor 42 and test point pressure sensor 5 are separately fixed in fixing seat 8.

Further, Fig. 4 and Fig. 5 are please referred to, a kind of tool as bridge deflection test device provided by the utility model Body embodiment, fixing seat 8 are equipped with for across the liquid pipe hole 82 of liquid pipe 3 and the accommodating chamber 81 being connected to liquid pipe hole 82, First datum mark pressure sensor 41, the second datum mark pressure sensor 42 or test point pressure sensor 5 are mounted on accommodating chamber In 81, the bottom of fixing seat 8 is equipped with the bolt hole 85 for being fixedly connected, acceleration transducer 51 and test point pressure sensor 5 fix and are installed in accommodating chamber 81.Liquid pipe 3 concatenates each fixing seat 8, the first datum mark pressure sensor 41, the second benchmark Press force snesor 42 and test point pressure sensor 5 be fixed in accommodating chamber 81, meanwhile, acceleration transducer 51 with it is corresponding Test point pressure sensor 5 is also secured in the accommodating chamber, that is, is realized, in the same test point test point pressure sensor 5 and test point at acceleration transducer 51 synchro measure, when carrying out data processing, can also weed out the same side survey Deflection metrology bring is influenced because bridge shakes at pilot, keeps measurement result more accurate.

Further, Fig. 4 and Fig. 5 are please referred to, a kind of tool as bridge deflection test device provided by the utility model Body embodiment, fixing seat 8 are equipped with the capping 84 for sealing accommodating chamber 81, are equipped with and phase between adjacent fixing seat 8 The elastic tracheae 9 that the accommodating chamber 81 answered is connected to, elastic tracheae 9 are equipped with air valve 91, and fixing seat 8 is equipped with for across tracheae 9 Tracheal orifice 83, tracheal orifice 83 is connected to accommodating chamber 81.In one closed container, exists and cause air pressure because temperature is different Different phenomenons, the componental movement that the high part of air pressure can be low to air pressure, and then keep the air pressure in closed container identical everywhere, it reaches To a kind of equilibrium state；Since the height and temperature of each test point and datum mark can be variant, this will cause each Test point and datum environmental pressure are different, that is, the pressure in the accommodating chamber 81 at one-to-one fixing seat 8 is not Together, so influence deflection of bridge span measuring accuracy；In the present embodiment, to balance pressure everywhere, closed container is evolved into each Closed accommodating chamber 81, and concatenated by closed elastic tracheae 9, the gas pressure of accommodating chamber 81 is with test point and datum Environmental pressure change, if the gas in some accommodating chamber 81 expands, the gas at this in accommodating chamber 81 can be squeezed Gas in compression elasticity tracheae 9 can be to another or separately several accommodating chambers 81 move, so that the pressure phase of each accommodating chamber 81 Together；If too large or too small after gas pressure balancing, elastic tracheae can deform, to finely tune entire closed container Volume also just realizes the gas pressure for balancing each accommodating chamber 81；When the air pressure of each accommodating chamber 81 of elastic tracheae 9 concatenation is flat After weighing apparatus, the air pressure in accommodating chamber 81 is to test point pressure sensor 5, the first datum mark pressure sensor 41 and the second datum mark Influence caused by pressure sensor 42 can cancel out each other in calculating process, i.e., test point pressure sensor 5 under same pressure, Although the signal that the first datum mark pressure sensor 41 and the second datum mark pressure sensor 42 measure includes liquids and gases pressure Power since the influence of gas pressure part is identical, therefore is equivalent to calculated result only and will receive the influence of fluid pressure variation.

Further, as a kind of specific embodiment of bridge deflection test device provided by the utility model, elasticity Tracheae 9 is ethylene propylene diene rubber material product.The material of elastic tracheae 9 is the elastic material that can be stretched, and adapts to elastic tracheae 9 The variation of gas volume in managing, in the present embodiment, the material of elastic tracheae 9 is ethylene propylene diene rubber；Gas sense temperature simultaneously Nitrogen etc. can be used in the safe gas of variation.

Further, referring to Fig. 1, a kind of specific implementation as bridge deflection test device provided by the utility model Mode, liquid pipe 3 are located at the part between liquid storing barrel 2 and the first datum mark pressure sensor 41 equipped with the bubble for filtering bubble Remover 10.Gaseous mixture, which is steeped oneself-meeting, in measurement liquid influences the measurement of fluid pressure, it is therefore desirable to enter in liquid pipe 3 in measurement liquid When by bubble removal device 10 by bubble filtering abolish, optimize the measurement accuracy of deflection of bridge span.

Further, referring to Fig. 6, a kind of specific implementation as bridge deflection test device provided by the utility model Mode, bubble removal device 10 include filter chamber 101, at least one is fixed in filter chamber 101 for filtering the filter screen of bubble 102, filter chamber 101 is equipped with the liquid inlet 103 being connected to liquid pipe 3, and the liquid outlet 104 being connected to liquid pipe 3,103 He of liquid inlet Liquid outlet 104 sets up separately in the two sides of filter screen 102.Measurement liquid in liquid pipe 3 flows slowly into filter chamber by liquid inlet 103 In 101, measurement liquid is flowed by self gravity into liquid pipe 3, and flow velocity is slow, measures the minute bubbles of liquid internal because collision is filtered Net 102 and rupture, realize that the purpose of filtering bubble, the size of 102 mesh of filter screen determine the size for the bubble that can be filtered, mistake The size of 102 mesh of strainer is selected according to actual needs, and the mesh spacing of filter screen 102 can be 0.5- in the present embodiment 0.9mm；Filtered liquid is full of the liquid pipe 3 of rear end by liquid outlet 104.

Bracket 1 is fixed on ground or bridge pier not affected by vibration, and fixed liquid storing barrel 2 is fixed on bracket 1, meanwhile, At least two fixing seats 8 are fixed on bracket 1, are also fixed fixing seat 8 respectively at each test point of bridge, are successively gone here and there with liquid pipe 3 Connect each fixing seat 8 on bracket 1 and bridge, fixation pressure pressure sensor in each fixing seat 8, consolidating at bridge test point Acceleration transducer 51 is also fixed in reservation 8, opens tapping valve 31, and the measurement liquid in liquid storing barrel 2 flows slowly into liquid pipe 3 It is interior, after measurement liquid is flowed out out of liquid pipe 3, tapping valve 31 is closed, elastic tracheae 31 is arranged in parallel with liquid pipe 3 to be sequentially connected in series respectively A fixing seat 8 fills gas into elastic tracheae 9 by air valve 91, heaves elastic tracheae 9 slightly, and elastic tracheae 9 is gone back at this time Energy sense ambient temperature or height change simultaneously carry out corresponding expansion or shrinkage, after the completion of elastic tracheae 9 is arranged, use capping 84 Seal accommodating chamber 81, test point pressure sensor 5, the first datum mark pressure sensor 41, the second datum mark pressure sensor 42 It is connect respectively by data acquisition device 6 with industrial personal computer 7 with acceleration transducer 51, at this point, the test device cloth of deflection of bridge span Set completion.

Test point pressure sensor 5 is fixed together with acceleration transducer 51, can thus measure on same time point, The acceleration change signal of pressure change signal and bridge at test point, using at pressure reference method in quiet hour section Pressure signal is managed, the deflection value that quadratic integral obtains is carried out to acceleration signal in dynamic time section, to replace the corresponding period The amount of deflection changing value that interior pressure reference method is handled, reaches reduction dynamic error, obtain complete deflection of bridge span value it is static, The variation of dynamic deflection, easy to operate, measurement is accurate.

The above is only the preferred embodiment of the utility model only, is not intended to limit the utility model, all at this Made any modifications, equivalent replacements, and improvements etc., should be included in the utility model within the spirit and principle of utility model Protection scope within.

Claims (10)

1. a kind of bridge deflection test device, which is characterized in that including bracket (1), be fixed on the bracket (1) for accommodating The liquid storing barrel (2) of liquid and the liquid pipe (3) that is connected to the liquid storing barrel (2) are measured, is fixed with and the liquid on the bracket (1) The the first datum mark pressure sensor (41) and the second datum mark pressure sensor (42) for managing (3) connection, along the length of bridge to be measured Several test point pressure sensors (5) for being connect with the liquid pipe (3) of degree direction arranged for interval, each test point pressure The acceleration transducer (51) for testing bridge acceleration is respectively and fixedly provided on sensor (5), the first benchmark point pressure passes Sensor (41), the second datum mark pressure sensor (42), the test point pressure sensor (5) and the acceleration sensing Device (51) is connect with the data acquisition device (6) for collecting test data, the data acquisition device (6) with for calculating Industrial personal computer (7) connection of data is analyzed, the liquid level of measurement liquid is higher than first benchmark and presses in the liquid storing barrel (2) Force snesor (41), the second datum mark pressure sensor (42) and the test point pressure sensor (5) installation site Highly, the height of the first datum mark pressure sensor (41) installation site is higher than the second datum mark pressure sensor (42) height of installation site.

2. bridge deflection test device as described in claim 1, it is characterised in that: the measurement liquid is water or silicone oil.

3. bridge deflection test device as claimed in claim 1 or 2, it is characterised in that: launching in the liquid storing barrel (2) has energy The anti-icing fluid mixed with the measurement liquid.

4. bridge deflection test device as described in claim 1, it is characterised in that: the free end of the liquid pipe (3) is equipped with row Liquid valve (31).

5. bridge deflection test device as described in claim 1, it is characterised in that: set on the bracket (1) and the bridge Have respectively with the first datum mark pressure sensor (41), the second datum mark pressure sensor (42) and the test point The one-to-one fixing seat (8) of pressure sensor (5), the first datum mark pressure sensor (41), second datum mark Pressure sensor (42) and the test point pressure sensor (5) are individually fixed on the fixing seat (8), the liquid pipe (3) It is sequentially connected in series several fixing seats (8).

6. bridge deflection test device as claimed in claim 5, it is characterised in that: the fixing seat (8) is equipped with for wearing The accommodating chamber (81) crossing the liquid pipe hole (82) of the liquid pipe (3) and being connected to the liquid pipe hole (82), first datum mark Pressure sensor (41), the second datum mark pressure sensor (42) or the test point pressure sensor (5) are mounted on institute It states in accommodating chamber (81), the bottom of the fixing seat (8) is equipped with the bolt hole (85) for being fixedly connected, the acceleration sensing Device (51) and the test point pressure sensor (5) are fixed and are installed in the accommodating chamber (81).

7. bridge deflection test device as claimed in claim 6, it is characterised in that: the fixing seat (8) is equipped with for close The capping (84) of the accommodating chamber (81) is sealed, is equipped between the adjacent fixing seat (8) and the corresponding accommodating chamber (81) the elastic tracheae (9) being connected to, the elasticity tracheae (9) are equipped with air valve (91), and the fixing seat (8) is equipped with for wearing The tracheal orifice (83) of the tracheae (9) is crossed, the tracheal orifice (83) is connected to the accommodating chamber (81).

8. bridge deflection test device as claimed in claim 7, it is characterised in that: the elasticity tracheae (9) is EPDM Rubber material product.

9. bridge deflection test device as described in claim 1, it is characterised in that: the liquid pipe (3) is located at the liquid storing barrel (2) part between the first datum mark pressure sensor (41) is equipped with the bubble removal device (10) for filtering bubble.

10. bridge deflection test device as claimed in claim 9, it is characterised in that: the bubble removal device (10) included Filter chamber (101), the filter chamber (101) is interior to be fixed at least one for filtering filter screen (102) of bubble, the filter chamber (101) it is equipped with the liquid inlet (103) being connected to the liquid pipe (3), and the liquid outlet (104) being connected to the liquid pipe (3), it is described Liquid inlet (103) and the liquid outlet (104) set up separately in the two sides of the filter screen (102).