CN212103650U - Spherical bridge support - Google Patents
Spherical bridge support Download PDFInfo
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- CN212103650U CN212103650U CN202020606515.7U CN202020606515U CN212103650U CN 212103650 U CN212103650 U CN 212103650U CN 202020606515 U CN202020606515 U CN 202020606515U CN 212103650 U CN212103650 U CN 212103650U
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Abstract
The utility model provides a spherical bridge support, which comprises an upper support plate, a lower support plate and a spherical crown lining plate arranged between the upper support plate and the lower support plate, wherein the peripheral wall of the upper support plate or the peripheral wall of the lower support plate is provided with a ring groove which is inwards sunken along the radial direction; a first strain sensor is arranged in the ring groove and used for measuring the circumferential strain at the ring groove. The utility model provides a spherical bridge support, which utilizes the circumferential strain measured by a first strain sensor to calculate the vertical load and vertical displacement of an upper support plate or a lower support plate so as to find the problem of the spherical bridge support at any time and acquire the information of a bridge in time; in addition, upper bracket board or bottom suspension bedplate can produce stress concentration in annular department, therefore the hoop strain that annular department measured will be greater than the hoop strain that measures at other positions of upper bracket board or bottom suspension bedplate, and the hoop strain of annular department can enlarge for the hoop strain of other positions of upper bracket board or bottom suspension bedplate, has promoted measurement accuracy.
Description
Technical Field
The utility model belongs to the technical field of bridge structures or building, more specifically say, relate to a bridge ball-type support.
Background
Bridge bearings are important components for connecting the upper structure (beam) and the lower structure (abutment) of a bridge. It not only transmits the stress and deformation of the upper structure to the lower structure faithfully, but also adapts to the corner and displacement of the upper structure under the action of load, temperature, concrete shrinkage and creep, so that the upper structure can deform freely without generating additional internal force. Therefore, the performance of the support is good and bad, and the performance is directly related to whether the whole bridge can work normally or not and the service life of the whole bridge.
Along with the change of the passing load and the environmental condition of the bridge, the bearing stress has large fluctuation, and the bearing stress is insufficient, uneven and even void due to long-term bias. The main beam internal force, the cross beam internal force and the support counter force are changed along with the change, the stress mode of the bridge structure is changed, the main beam, the bridge deck and the abutment are damaged, and the service life of the support is shortened. Many diseases of the bridge support can cause the loss of some functions or all functions of the support, and if the detection is not timely, the work with diseases can bring serious harm to the bridge. Meanwhile, the support is a component which is easy to damage but not easy to repair in the bridge structure, and generally needs to be replaced again after being damaged, so that the replacement construction can influence or interrupt traffic, and economic loss and adverse social influence are easily caused.
At present, measurement parameters such as stress and displacement of a bridge support at home and abroad are mainly divided into three methods: the method has the advantages that firstly, the uniform distribution type integral force-measuring support obtains the integral stress of the bridge support through various principles, but the method can only effectively measure the integral bearing load of the support and cannot finely reflect the stress distribution in the support; secondly, the non-uniform integral force-measuring support obtains the integral stress of the support by setting up a discrete sensor, the support obtains the integral bearing of the support in the form of non-uniform stress of the support by respectively introducing sensitive elements such as a pressure sensor, a telescopic variable resistor, a fiber grating sensor, a strain gauge and the like into the traditional support, the internal stress distribution of the support cannot be finely and clearly reflected, and meanwhile, the introduction of the sensitive elements also has great influence on the support structure; thirdly, the bridge support is empty to test the method, but the existing method has the problems of single physical quantity, single measuring position, integral structure measurement, great influence on the mechanical property of the support due to the change of the support structure, and the like. Therefore, the existing support monitoring method cannot reflect the distribution stress of the support, and cannot realize the effective fusion of the sensitive element and the support.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a bridge ball-type support aims at solving the distribution atress of the unable reaction support that exists among the prior art and can not realize the technical problem of the effective integration of sensing element and support.
In order to achieve the above object, the utility model adopts the following technical scheme: the bridge spherical support comprises an upper support plate, a lower support plate and a spherical crown lining plate arranged between the upper support plate and the lower support plate, wherein a ring groove which is inwards recessed along the radial direction is formed in the peripheral wall of the upper support plate or the peripheral wall of the lower support plate; a first strain sensor is arranged in the ring groove and used for measuring the circumferential strain at the ring groove.
As another embodiment of the present invention, the bottom wall of the ring groove is parallel to the outer peripheral wall of the upper support plate or the outer peripheral wall of the lower support plate.
As another embodiment of the present invention, the side wall of the ring groove is perpendicular to the bottom wall of the ring groove.
As another embodiment of the present invention, a fillet transition is adopted between the bottom wall of the ring groove and the side wall of the ring groove.
As another embodiment of the utility model, still be provided with the second strain sensor in the annular, the second strain sensor is used for measuring the hoop strain of annular department.
As another embodiment of the utility model, the up end of spherical crown welt is the plane, the lower terminal surface of upper bracket board also is the plane, the spherical crown welt with be equipped with the mirror surface metal sheet between the upper bracket board.
As another embodiment of the present invention, a plane wear-resistant sliding plate is further disposed between the spherical cap lining plate and the mirror surface metal plate.
As another embodiment of the present invention, the lower end surface of the spherical cap lining plate is a lower convex spherical surface, the upper end surface of the lower support plate is an upper concave spherical surface, the spherical cap lining plate is in spherical contact with the lower support plate, and the spherical cap lining plate is provided with a spherical wear-resistant sliding plate between the lower support plates.
The utility model provides a bridge ball-type support's beneficial effect lies in: compared with the prior art, the utility model discloses bridge spherical bearing sets up the annular that radially inwards caves in on the periphery wall of upper bracket board or the periphery wall of lower bolster, installs first strain sensor in the annular, utilizes the hoop strain that first strain sensor measured to calculate vertical load and the vertical displacement of upper bracket board or lower bolster to discover the problem of bridge spherical bearing at any time, in time learns the information of bridge; in addition, upper bracket board or bottom suspension bedplate can produce stress concentration in annular department, therefore the hoop strain that annular department measured will be greater than the hoop strain that measures at other positions of upper bracket board or bottom suspension bedplate, and the hoop strain of annular department can enlarge for the hoop strain of other positions of upper bracket board or bottom suspension bedplate, has promoted measurement accuracy.
Drawings
Fig. 1 is a schematic structural diagram of a spherical bridge support according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram ii of a spherical bridge support provided in an embodiment of the present invention;
fig. 3 is a schematic structural view of a spherical bridge support at a ring groove according to an embodiment of the present invention.
In the figure: 1. an upper support plate; 2. a lower support plate; 3. a spherical cap liner plate; 4. a ring groove; 5. a first strain sensor; 6. a second strain sensor; 7. a mirror-surface metal plate; 8. a plane wear-resistant sliding plate; 9. spherical wear-resistant sliding plate.
Detailed Description
In order to make the technical problem, technical solution and advantageous effects to be solved by the present invention more clearly understood, the following description is given in conjunction with the accompanying drawings and embodiments to illustrate the present invention in further detail. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1 and fig. 2, the bridge ball-shaped support of the present invention will now be described. Bridge ball-type support includes upper bracket board 1, undersetting board 2 to and set up the spherical crown welt 3 between upper bracket board 1 and undersetting board 2. The peripheral wall of the upper support plate 1 or the peripheral wall of the lower support plate 2 is provided with a ring groove 4 which is inwards sunken along the radial direction; a first strain sensor 5 is arranged in the ring groove 4, and the first strain sensor 5 is used for measuring the circumferential strain at the ring groove 4.
It should be noted that, regardless of whether the first strain sensor 5 is mounted on the upper seat plate 1 or the lower seat plate 2, the vertical loads of the upper seat plate 1 and the lower seat plate 2 can be calculated. If the vertical load borne by the upper support plate 1 is FOn the upper partThe vertical bearing force transmitted to the lower bearing plate 2 through the transmission of force is FLower part＝αFOn the upper part。
Additionally, the utility model discloses a first strain sensor 5 can adopt the grating sensor, and the grating sensor adopts grating packaging technology such as gluey encapsulation or metallization encapsulation to install with upper bracket board 1 or bottom suspension fagging 2. First strain sensor 5 is connected with data acquisition equipment, and data acquisition equipment directly reads first strain sensor 5's measured data to but the vertical load and the vertical displacement of direct calculation demonstration upper bracket board 1 and bottom suspension board 2.
In this embodiment, the vertical load of the upper seat plate 1 or the lower seat plate 2 is calculated from the measured hoop strain at the ring groove 4. And calculating the vertical displacement of the upper support plate 1 or the lower support plate 2 according to the calculated vertical load.
Wherein the upper support plate 1 or the lower supportThe circumferential strain of the seat plate 2 at the ring groove 4 isxWherein:
in the formula (I), the compound is shown in the specification,xthe vertical stress of the upper support plate 1 or the lower support plate 2 at the ring groove 4 is shown, F is the vertical load of the upper support plate 1 or the lower support plate 2, upsilon is Poisson ratio, E is the elastic modulus of the upper support plate 1 or the lower support plate 2, and A is the cross-sectional area of the upper support plate 1 or the lower support plate 2 at the ring groove 4.
According to the measured circumferential strain of the upper support plate 1 or the lower support plate 2 at the ring groove 4, the vertical load F of the upper support plate 1 or the lower support plate 2 is calculated,
according to the calculated vertical load F of the upper support plate 1 or the lower support plate 2, the vertical displacement Delta L of the upper support plate 1 or the lower support plate 2 is calculated,
wherein L is the axial height of the upper support plate 1 or the lower support plate 2.
The utility model provides a bridge spherical bearing, compared with the prior art, under the prerequisite that does not change spherical bearing on a large scale, set up on the periphery wall of upper bracket board 1 or the periphery wall of lower bolster board 2 along radial inside sunken annular 4, install first strain sensor 5 in annular 4, utilize the hoop strain that first strain sensor 5 measured to calculate vertical load and the vertical displacement of upper bracket board 1 or lower bolster board 2, in order to discover the problem of bridge spherical bearing at any time, in time learn the information of bridge, can both assess the construction security, the security of predictable bridge use again; meanwhile, a data base is provided for the replacement and maintenance of the spherical bridge support, and the economic loss and the adverse social influence are reduced.
Because upper bracket board 1 and lower support plate 2 are along the body of revolution structure of axis symmetry, when receiving vertical load effect, the measured value data of hoop strain is very little, under the low condition of measurement accuracy of first strain sensor 5, will appear measured data inaccurate, if the measured data of hoop strain is inaccurate, that calculates the vertical load that reachs and vertical displacement's data also inaccurate.
And the utility model provides a bridge ball-type support sets up annular 4 on last bedplate 1 or bottom suspension bedplate 2, and upper bracket board 1 or bottom suspension bedplate 2 can produce stress concentration in annular 4 department, and consequently annular 4 department's measuring hoop strain will be than at last bedplate 1 or bottom suspension bedplate 2 other positions measuring hoop strain greatly, that is to say the hoop strain of annular 4 department can enlarge for the hoop strain of upper bracket board 1 or bottom suspension bedplate 2 other positions relatively.
The measured circumferential strain at the ring groove 4 is amplified, so that the measurement precision is high, and the vertical load and the vertical displacement of the upper support plate 1 or the lower support plate 2 can be accurately calculated.
The following explains a principle that the hoop strain at the ring groove 4 is amplified with respect to the hoop strain at other positions of the upper seat plate 1 or the lower seat plate 2.
Firstly, in order to realize the purposes of not changing the structure of the bridge spherical bearing and measuring the circumferential strain by the first strain sensor 5, the first strain sensor 5 is arranged on the peripheral wall of the upper bearing plate 1 or the peripheral wall of the lower bearing plate 2.
Fig. 3 is the schematic structural diagram of the bridge spherical bearing provided by the embodiment of the present invention at the ring groove 4, the circumferential direction strain at the peripheral wall of the upper supporting plate 1 or the peripheral wall of the lower supporting plate 2 becomes1Wherein:
wherein F is the vertical load of the upper support plate 1 or the lower support plate 2, upsilon is Poisson's ratio, E is the elastic modulus of the upper support plate 1 or the lower support plate 2, and d is1Is the diameter of the upper support plate 1 or the lower support plate 2。
The annular strain of the upper support plate 1 or the lower support plate 2 at the ring groove 4 is changed2Wherein:
in the formula (d)2Is the diameter of the upper bearing plate 1 or the lower bearing plate 2 at the ring groove 4.
From this, the signal amplification k can be obtained
The effect that the amplified hoop strain can improve the measurement accuracy is explained by the following tests:
the first strain sensor 5 is respectively arranged on the peripheral wall of the lower support plate 2 and the ring groove 4, and the outer diameter d of the lower support plate 21Is 480mm, and the outer diameter d of the lower support plate 2 at the ring groove 42The checking can be 267mm according to the bending combined deformation and the compressive stress intensity, and a rated vertical load F is applied to the upper support plate 1Upper ratingBy transmission of force, FUpper ratingThe vertical bearing force transmitted to the lower bearing plate 2 is FLower rating＝αFUpper rating。
If vertical bearing force FUpper ratingThe poisson's ratio of the Q345B steel is 0.25 to 0.3, 0.3 is taken for calculation, E is 210GPa, and the circumferential strain of the outer circumferential wall of the lower seat plate 21Comprises the following steps:
the first strain sensor 5 for measuring the hoop strain, such as a fiber grating sensor, can measure usually about 10 microstrains with accuracy, and the hoop strain caused by the vertical bearing capacity when the ball-type support is fully loaded is only about 40 microstrains, so the hoop strain caused by the vertical bearing capacity when the ball-type support is actually applied is difficult to detect by the fiber grating sensor.
Circumferential strain of the lower support plate 2 at the ring groove 42Comprises the following steps:
the obtained annular strain is far higher than the measurement precision of the fiber grating sensor, and the amplification factor of the measurement signal is
An improvement in measurement sensitivity is achieved.
Referring to fig. 1, as a specific embodiment of the bridge spherical bearing provided by the present invention, the bottom wall of the ring groove 4 is parallel to the peripheral wall of the upper supporting plate 1 or the peripheral wall of the lower supporting plate 2, and the side wall of the ring groove 4 is perpendicular to the bottom wall of the ring groove 4.
By adopting the technical scheme, the ring groove 4 is easy to form, and the structure of the bridge spherical bearing is not changed in a large range. And facilitates the assembly of the first strain sensor 5 with the upper or lower seat plate 1, 2.
Preferably, in order to avoid premature failure at the junction of the bottom wall of the ring groove 4 and the side wall of the ring groove 4, a rounded transition is used between the bottom wall of the ring groove 4 and the side wall of the ring groove 4, as shown in fig. 2.
Referring to fig. 1, as a specific embodiment of the bridge spherical support provided by the present invention, a second strain sensor 6 is further disposed in the ring groove 4, and the second strain sensor 6 is used for measuring the hoop strain at the ring groove 4. The first strain sensor 5 is arranged horizontally, and the second strain sensor 6 is arranged vertically.
Specifically, a plurality of first strain sensors 5 and a plurality of second strain sensors 6 are installed in the ring groove 4 at equal intervals in the circumferential direction; the first strain sensors 5 correspond one-to-one to the second strain sensors 6.
Referring to fig. 1, as a specific embodiment of the spherical bridge support provided by the present invention, the upper end surface of the spherical cap lining plate 3 is a plane, the lower end surface of the upper support plate 1 is also a plane, and a mirror surface metal plate 7 is disposed between the spherical cap lining plate 3 and the upper support plate 1. A plane wear-resistant sliding plate 8 is also arranged between the spherical crown lining plate 3 and the mirror surface metal plate 7.
The lower end face of the spherical crown lining plate 3 is a convex spherical surface, the upper end face of the lower support plate 2 is a concave spherical surface, the spherical crown lining plate 3 is in spherical contact with the lower support plate 2, and a spherical wear-resistant sliding plate 9 is arranged between the spherical crown lining plate 3 and the lower support plate 2.
The upper support plate 1, the spherical crown lining plate 3 and the lower support plate 2 can be made of materials such as Q345B, Q345C or ZG270-500, the mirror surface metal plate 7 can be made of materials such as 06Cr17Ni12Mo2, and the plane wear-resistant sliding plate 8 and the spherical wear-resistant sliding plate 9 can be made of materials such as modified ultrahigh molecular weight polyethylene.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (8)
1. The bridge spherical bearing comprises an upper bearing plate, a lower bearing plate and a spherical crown lining plate arranged between the upper bearing plate and the lower bearing plate, and is characterized in that a ring groove which is inwards sunken along the radial direction is arranged on the peripheral wall of the upper bearing plate or the peripheral wall of the lower bearing plate; a first strain sensor is arranged in the ring groove and used for measuring the circumferential strain at the ring groove.
2. A bridge ball-type socket according to claim 1, wherein the bottom wall of said ring groove is disposed in parallel with the outer peripheral wall of said upper socket plate or the outer peripheral wall of said lower socket plate.
3. The bridge ball mount of claim 2, wherein the side walls of the ring groove are disposed perpendicular to the bottom wall of the ring groove.
4. A bridge ball-type socket according to claim 3, wherein rounded corners are provided between the bottom wall of said ring groove and the side walls of said ring groove.
5. The bridge ball-type mount of claim 1, further comprising a second strain sensor disposed within the ring groove, the second strain sensor configured to measure a hoop strain at the ring groove.
6. The bridge ball-type socket according to claim 1, wherein the upper end surface of the spherical cap liner plate is a plane, the lower end surface of the upper socket plate is also a plane, and a mirror surface metal plate is disposed between the spherical cap liner plate and the upper socket plate.
7. The bridge ball-type socket of claim 6, wherein a planar wear-resistant sliding plate is further disposed between the spherical cap lining plate and the mirror metal plate.
8. The bridge ball-type socket according to claim 7, wherein the lower end surface of the spherical cap lining plate is a convex spherical surface, the upper end surface of the lower socket plate is a concave spherical surface, the spherical cap lining plate is in spherical contact with the lower socket plate, and a spherical wear-resistant sliding plate is arranged between the spherical cap lining plate and the lower socket plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020606515.7U CN212103650U (en) | 2020-04-21 | 2020-04-21 | Spherical bridge support |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020606515.7U CN212103650U (en) | 2020-04-21 | 2020-04-21 | Spherical bridge support |
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| Publication Number | Publication Date |
|---|---|
| CN212103650U true CN212103650U (en) | 2020-12-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020606515.7U Active CN212103650U (en) | 2020-04-21 | 2020-04-21 | Spherical bridge support |
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| CN (1) | CN212103650U (en) |
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- 2020-04-21 CN CN202020606515.7U patent/CN212103650U/en active Active
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