CN104122023B - Bridge expanssion joint jumps car impact force testing device - Google Patents

Bridge expanssion joint jumps car impact force testing device Download PDF

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Publication number
CN104122023B
CN104122023B CN201410362450.5A CN201410362450A CN104122023B CN 104122023 B CN104122023 B CN 104122023B CN 201410362450 A CN201410362450 A CN 201410362450A CN 104122023 B CN104122023 B CN 104122023B
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China
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bridge
access
dolly
main
testing device
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Expired - Fee Related
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CN201410362450.5A
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CN104122023A (en
Inventor
丁勇
林云
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Ningbo University
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Ningbo University
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Abstract

A kind of bridge expanssion joint jumps car impact force testing device, comprise base, bridge model, dolly and inductor group, bridge model to be arranged on described base and to comprise main bridge, the first access bridge and the second access bridge, first access bridge, the second access bridge are arranged on the two ends of main bridge and the two ends of main bridge are connected with base with roller support respectively by hinged-support, and described first access bridge, the second access bridge and main bridge top are formed with a straight-through bridge floor; Dolly is placed on described bridge floor and also can travels with certain speed thereon, inductor group, comprise the impulsive force perpendicular to bridge floor direction for measuring the first inductor and for measuring the second inductor of impulsive force along bridge floor direction, be arranged at the seam crossing of main bridge and the first access bridge, the second access bridge.Compared with prior art, this proving installation structure is simple, and the percussive action to bridge expansion joint structure during the upper and lower bridge of effective simulating vehicle, accurately tests impulsive force, can be the design of high-performance bridge expansion joint, construction and maintenance and provide theoretical foundation.

Description

Bridge expanssion joint jumps car impact force testing device
Technical field
The present invention relates to building and traffic engineering field, particularly relate to a kind of bridge expanssion joint and jump car impact force testing device.
Background technology
Bridge, under the factor effects such as temperature, by producing longitudinal expansion and contraction, in order to meet this distortion, needs to arrange expansion joint between two beam-ends or between beam-ends and abutment.Because the dynamic load of vehicle is born at expansion joint for a long time, therefore expansion joint is the weak part of bridge structure, is also when the chief destructive position on front axle beam, and the dynamic load of wheel of vehicle is then the key parameter of expansion joint design, construction, maintenance.In current bridge specification, still not for expansion joint, theoretical calculation method and the experimental test procedures of the wheel dynamic load be applied to it is proposed.Because vehicle is relevant with bridge vibration of beam to the motion of the impact load at expansion joint and vehicle, vehicle, therefore this is a complicated shock dynamics problem, design the proving installation of impulsive force suffered by a set of meticulous expansion joint, for experiment and the theoretical research of bridge expanssion joint design load, there is important practical value, for the technical progress of current science of bridge building, then there is the urgency of reality.
Expansion joint between two beam-ends, or between bridge and abutment.Expansion joint impact force testing device is wanted to reflect the transport condition and vibration that on vehicle, bridge is forward and backward, and bridge vibration of beam.When utilizing this device to test, need the wheel impacts power that acquisition expansion joint is subject to, and the vibration data of bridge and vehicle, then using experimental data as Research foundation, obtain the analysis theories of expansion joint impulsive force, for bridge structure, particularly wherein the design at expansion joint and maintenance lay the foundation.
Summary of the invention
Technical matters to be solved by this invention provides a kind of to jump car impact force testing device at Shang Qiao and lower bridge to the bridge expanssion joint of expanded joint structure impulsive force through bridge (comprising expansion joint) overall process, effectively measuring vehicle by real simulation vehicle for prior art.
The present invention solves the problems of the technologies described above adopted technical scheme: a kind of bridge expanssion joint jumps car impact force testing device, it is characterized in that comprising: base, bridge model, be arranged on described base, comprise main bridge, first access bridge and the second access bridge, described main bridge comprises first end with the second end and is connected with base with the second bearing respectively by the first bearing, described first access bridge is arranged on the first end of main bridge and is connected with base by three abutments, described second access bridge is arranged on the second end of main bridge and is connected with base by the 4th bearing, described first access bridge and main bridge and form expanded joint structure respectively between the second access bridge and main bridge, described first access bridge, second access bridge and main bridge top are formed with a straight-through bridge floor, dolly is placed on described bridge floor and also can travels thereon, and inductor group, for measuring the impulsive force of described dolly to expanded joint structure, comprise for measuring perpendicular to the first inductor of the impulsive force in bridge floor direction and the second inductor for measuring the impulsive force along bridge floor direction, and be arranged at respectively on described second bearing and three abutments.
Described first bearing is roller support and the second bearing is hinged-support, and make winner's bridge under a load, the end of main bridge can be rotated freely and slide, and eliminates amount of deflection to the impact of main bridge inner structure.
For measuring the amount of deflection change of dolly main bridge in main bridge bridge driving process, described main pars basilaris pontis is arranged at intervals with multiple survey instrument for measuring main bridge amount of deflection.
As preferably, described inductor group comprises first inductor and two the second inductors, and two the second inductors are oppositely arranged on the both sides of the first inductor, can gather required impact force data preferably like this.
For making dolly on bridge floor with certain speed smooth-ride, make test result more accurate, the base of described bridge model both sides is respectively equipped with the traction component for trailer wagon, this traction component comprises traction wheel and the traction rope of winding on traction wheel, and described dolly is linked by traction rope and traction wheel.
The specific implementation of described dolly can have multiple, as preferably, described dolly comprises little kickstand and is arranged on dolly frame bottom and four road wheels travelled on bridge floor for dolly, the inside of described little kickstand is provided with for regulating the tune restructuring part of dolly overall weight that outside surrounding is provided with the angle sheave of fitting with the sidewall of bridge floor both sides, adjust restructuring part can need to adjust dolly weight and distribution thereof according to test, and the bootable dolly of angle sheave normally travel on bridge floor according to design route.
Further, described little kickstand comprises upper plate and lower plate, described tune restructuring part comprises the support column be arranged in lower plate and the counterweight be set on this support column, and so design makes to adjust the realization of heavy assembly function very simple, and easily increase and decrease counterweight can realize the change of dolly weight.
For the vibration of dolly inner structure in reflection test process is on the impact of impulsive force suffered by expansion joint, need the suspension system that vehicle is set, particularly, the wheel shaft of road wheel is provided with axostylus axostyle, one end of this axostylus axostyle to be set on wheel shaft by a pole socket and inside adjacent row travelling wheel, the other end to be exposed in little kickstand through lower plate and to be provided with external thread, and this shaft rod upper sleeve is provided with a spring and this spring offsets with lower plate bottom surface and pole socket end face respectively.
As preferably, described upper plate is insulation thistle board, as poly (methyl methacrylate) plate etc., not only can alleviate the overall weight of dolly, make whole proving installation structure more stable, and insulation thistle board can add other electrical measurement elements, as acceleration sensor, vibration transducer etc., thus the test specification of this device of easily extensible, make the more diversification of its test function, thus be applied to better in bridge performance detection experiment.
Described bridge floor both ends are respectively arranged with the cushion pad extended along bridge deck width direction, avoid dolly to travel and drop because of inertia effect to during bridge floor end.
Compared with prior art, the invention has the advantages that: bridge model and dolly are set, in Reality simulation bridge vehicle Shang Qiao and lower bridge by during expansion joint between main bridge and access bridge to the impact of main bridge and access bridge, the impulsive force perpendicular to bridge floor direction when being hit by the inductor group expansion joint gathered between main bridge and access bridge and the impulsive force along bridge floor aspect; This proving installation structure is simple, and to the percussive action at bridge and expansion joint thereof during the upper and lower bridge of effective simulating vehicle, test result accurately and reliably, can be high-performance bridge and expansion joint design provides theoretical foundation.
Accompanying drawing explanation
Fig. 1 is embodiment of the present invention Bridge Extension joint impact force testing device perspective view;
Fig. 2 is embodiment of the present invention Bridge Extension joint impact force testing device partial exploded view;
Fig. 3 is I magnified partial view in Fig. 2;
Fig. 4 is II magnified partial view in Fig. 2;
Fig. 5 is dolly perspective view in the embodiment of the present invention.
Embodiment
Below in conjunction with accompanying drawing embodiment, the present invention is described in further detail.
As shown in Claims 1 to 5, bridge expanssion joint is jumped car impact force testing device and is comprised base 2, main bridge 11 in bridge model 1 and access bridge, dolly 3 and inductor group 20, wherein main bridge 11 two ends are respectively first end 111 and the second end 112, access bridge comprises the first access bridge 12 and the second access bridge 13 and is separately positioned on first end 111 and the second end 112 of main bridge 11, namely form expanded joint structure between the first access bridge 12 and first end 111 and between the second access bridge 13 and the second end 112, form expanded joint structure, and, one straight-through bridge floor 14 is formed at access bridge and main bridge 11 top.In the present embodiment, base 2 is two and is separately positioned on the two ends of bridge model 1, the free end of the first access bridge 12 is connected with base 2 by one the 5th bearing 10 and the other end is connected with base 2 by three abutments 7, equally, the free end of the second access bridge 13 is also connected with base 2 by one the 6th bearing 16 and the other end is connected with base 2 by the 4th bearing 9, three abutments 7 is hinged-support, and above-mentioned 5th bearing 10, the 6th bearing 16 and the 4th bearing 9 are hold-down support, the first end 111 of main bridge 11 is connected with base 2 with the second bearing 8 respectively by the first bearing 6 with the second end 112, wherein the first bearing 6 is for roller support and the second bearing 8 is hinged-support, two rollers 62 that first bearing 6 comprises support saddle frame 61 and is arranged on support saddle frame 61, the first end 111 of main bridge 11 is placed on two roller 62 wheel face, when main bridge 11 makes to produce amount of deflection in bridge span because of load, central axis when bridge is static bends, thus make the horizontal direction Distance Shortened of bridge, therefore the bearing at main bridge 11 two ends is designed to hinged-support and roller support respectively, make winner's bridge 11 under a load, the end of main bridge 11 can be rotated freely and slide, eliminate amount of deflection to the impact of main bridge 11 inner structure.
Above-mentioned bridge floor 14 is placed with dolly 3, the base 2 of bridge model 1 both sides is respectively arranged with one for the traction component 4 of trailer wagon 3, this traction component 4 comprises pedestal 41, be arranged on traction wheel 42 on pedestal 41 and the traction rope (not shown) of winding on traction wheel 42, dolly 3 is linked by traction rope and traction wheel 42, thus this dolly 3 can be travelled by certain speed on bridge floor 14.Dolly 3 in the present embodiment comprises little kickstand 31 and is arranged on four road wheels 32 travelled in bridge floor 14 bottom little kickstand 31 and for dolly 3, is equipped with wheel shaft 35 and wheelspan between two-wheeled reduces in proportion by the wheelspan of engineering truck between the road wheel 32 of the left and right sides.Little kickstand 31 is in rectangular-shaped, the joint pin 313 comprising upper plate 311 setting up and down and lower plate 312 and be connected between upper plate 311 and lower plate 312, wherein, lower plate 312 is provided with the tune restructuring part 33 for adjusting dolly 3 overall weight, restructuring part 33 is adjusted to be two in the present embodiment, be distributed on the rear and front end of lower plate 312, comprise the support column 331 be arranged in lower plate 312 and the counterweight 332 be set on this support column 331 respectively, counterweight 332 can be increased and decreased as required in test process thus change dolly 3 overall weight, very convenient; In the present embodiment, upper plate 311 is insulation thistle board, as poly (methyl methacrylate) plate etc., so not only can alleviate the overall weight of dolly 3, make whole proving installation structure more stable, and insulation thistle board can add other electrical measurement elements, as acceleration sensor, vibration transducer etc., thus the test specification of this device of easily extensible, make the more diversification of its test function, thus be applied to better in bridge performance detection experiment.The corner place of lower plate 312 is separately installed with an angle sheave 34 and each angle sheave 34 is fitted with the sidewall of bridge floor 14 both sides respectively, the bootable dolly 3 of angle sheave 34 normally travels along design route on bridge, because dolly 3 travels with certain speed in bridge floor 14, travel for preventing dolly 3 and drop because of inertia effect to during bridge floor 14 end, the both ends of bridge floor 14 are respectively arranged with the cushion pad 15 extended along bridge deck width direction.The wheel shaft 35 of road wheel 32 is provided with axostylus axostyle 362, one end of this axostylus axostyle 362 to be set on wheel shaft 35 by a pole socket 361 and inside adjacent row travelling wheel 32, the other end to be exposed in little kickstand 31 through lower plate 312 and to be provided with external thread (not shown), this axostylus axostyle 362 is arranged with a spring 363 and this spring 363 respectively with lower plate 312 bottom and pole socket 361 top offset, design like this can reflect the impact that the suspension system of vehicle is vibrated it, as shown in Figure 5, when dolly 3 inner structure degree of integration is higher do not affect by suspension system time, nut 364 can be screwed on the external thread of axostylus axostyle 362, car body is directly supported on road wheel 32.
For test car 3 through the expansion joint of access bridge and main bridge 11 to the impact load of bridge model 1, this device is provided with the inductor group 20 for measuring main bridge 11 or access bridge impulsive force, this inductor group 20 is arranged on the second bearing 8 and three abutments 7, be respectively used to the impulsive force of the vehicle tyre that the expansion joint between measurement first access bridge 12 and main bridge 11 is subject to, each inductor group 20 includes the first inductor 22 of the impulsive force perpendicular to bridge floor 14 direction for measuring and the second inductor 21 for measuring the impulsive force along bridge floor direction, in the present embodiment, each inductor group 20 comprises first inductor 22 and two the second inductors 21, and two second inductors 21 are oppositely arranged on the both sides of the first inductor 22, required impact force data can be gathered preferably like this.
When dolly 3 travels on main bridge 11 bridge, the displacement of the lines perpendicular to axis that bridge causes because of flexure under Moment, in order to reflect the Vibration Condition of this bridge structure, at main bridge 11 bottom interval, multiple survey instrument for measuring main bridge 11 amount of deflection is set, in the present embodiment, survey instrument is clock gauge 5, clock gauge 5 is 4, be arranged at the center bottom main bridge 11 and 1/4th places respectively, thus in Obtaining Accurate dolly 3 driving process, the amount of deflection at main bridge 11 bridge center and 1/4th places.
During test, dolly 3 is positioned over the second access bridge 13 place, under the traction of traction wheel 42, dolly 3 crosses the seam crossing of the second access bridge 13 and main bridge 11, the first inductor 22 on three abutments 7 and the second inductor 21 gather respectively to main bridge 11 when dolly 3 reaches main bridge 11 perpendicular to bridge floor 14 direction impulsive force and the impulsive force along bridge floor 14 direction, after dolly 3 sails main bridge 11 bridge into, clock gauge 5 bottom main bridge 11 under being recorded in dolly 3 load respectively main bridge 11 bridge in the amount of deflection at center and 1/4th places, dolly 3 crosses the seam crossing of main bridge 11 and the first access bridge 12 subsequently, the first inductor 22 on second bearing 8 and the second inductor 21 gather the impulsive force perpendicular to bridge floor 14 direction of the first access bridge 12 when dolly sails the first access bridge 12 into and the impulsive force along bridge floor 14 direction respectively, last dolly 3 stops under the buffering of cushion pad 15, analyze the data gathered and provide theoretical foundation for Bridge Design.

Claims (9)

1. bridge expanssion joint jumps a car impact force testing device, it is characterized in that comprising:
Base (2);
Bridge model (1), be arranged on described base (2), comprise main bridge (11), first access bridge (12) and the second access bridge (13), described main bridge (11) comprises first end (111) with the second end (112) and is connected with base (2) with the second bearing (8) respectively by the first bearing (6), and this first bearing (6) is for roller support and the second bearing (8) is hinged-support, described first access bridge (12) is arranged on the first end (111) of main bridge (11) and is connected with base (2) by three abutments (7), described second access bridge (13) is arranged on the second end (112) of main bridge (11) and is connected with base (2) by the 4th bearing (9), described first access bridge (12) and main bridge (11) and form expanded joint structure respectively between the second access bridge (13) and main bridge (11), described first access bridge (12), second access bridge (13) and main bridge (11) top are formed with a straight-through bridge floor (14),
Dolly (3), is placed on described bridge floor (14) and above also can travels on bridge floor; And
Inductor group (20), for measuring described dolly (3) to the impulsive force of expanded joint structure, comprise for measuring perpendicular to first inductor (22) of the impulsive force in bridge floor (14) direction and the second inductor (21) for measuring the impulsive force along bridge floor (14) direction, and be arranged at respectively on described second bearing (8) and three abutments (7).
2. bridge expanssion joint as claimed in claim 1 jumps car impact force testing device, it is characterized in that: described main bridge (11) bottom interval is provided with multiple survey instrument for measuring main bridge (11) amount of deflection.
3. bridge expanssion joint as claimed in claim 1 or 2 jumps car impact force testing device, it is characterized in that: described inductor group (20) comprises first inductor (22) and two the second inductors (21), and two the second inductors (21) are oppositely arranged on the both sides of the first inductor (22).
4. bridge expanssion joint as claimed in claim 1 or 2 jumps car impact force testing device, it is characterized in that: the base (2) of described bridge model (1) both sides is respectively equipped with the traction component (4) for trailer wagon (3), this traction component (4) comprises traction wheel (42) and the traction rope of winding on traction wheel (42), and described dolly (3) is linked by traction rope and traction wheel (42).
5. bridge expanssion joint as claimed in claim 1 or 2 jumps car impact force testing device, it is characterized in that: described dolly (3) comprises little kickstand (31) and is arranged on little kickstand (31) bottom and four road wheels (32) travelled in the bridge floor (14) for dolly (3), the inside of described little kickstand (31) is provided with for regulating tune restructuring part (33) of dolly (3) overall weight that outside surrounding is provided with the angle sheave (34) of fitting with bridge floor (14) left and right sidewall.
6. bridge expanssion joint as claimed in claim 5 jumps car impact force testing device, it is characterized in that: described little kickstand (31) comprises upper plate (311) and lower plate (312), described tune restructuring part (33) comprises the support column (331) be arranged in lower plate (312) and the counterweight (332) be set on this support column (331).
7. bridge expanssion joint as claimed in claim 6 jumps car impact force testing device, it is characterized in that: the wheel shaft (35) of described road wheel (32) is provided with axostylus axostyle (362), one end of this axostylus axostyle (362) is set in wheel shaft (35) upper also adjacent row travelling wheel (32) inner side by a pole socket (361), the other end to be exposed in little kickstand (31) through lower plate (312) and to be provided with external thread, this axostylus axostyle (362) is arranged with a spring (363) and this spring (363) respectively with lower plate (312) bottom and pole socket (361) top offset.
8. bridge expanssion joint as claimed in claim 5 jumps car impact force testing device, it is characterized in that: described upper plate (311) is insulation thistle board.
9. bridge expanssion joint as claimed in claim 1 or 2 jumps car impact force testing device, it is characterized in that: the both ends of described bridge floor (14) are respectively arranged with the cushion pad (15) extended along bridge floor (14) Width.
CN201410362450.5A 2014-07-28 2014-07-28 Bridge expanssion joint jumps car impact force testing device Expired - Fee Related CN104122023B (en)

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Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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CN109269610B (en) * 2018-09-14 2021-02-09 重庆工程职业技术学院 Method for measuring vertical load in suspension tunnel
CN109798869B (en) * 2019-03-12 2020-12-22 河北锐驰交通工程咨询有限公司 Device for measuring bump height difference distribution at bridge head and working method thereof

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