CN217359367U - Loading frame for precast beam single-beam static load test - Google Patents
Loading frame for precast beam single-beam static load test Download PDFInfo
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- CN217359367U CN217359367U CN202221095323.XU CN202221095323U CN217359367U CN 217359367 U CN217359367 U CN 217359367U CN 202221095323 U CN202221095323 U CN 202221095323U CN 217359367 U CN217359367 U CN 217359367U
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- 238000012360 testing method Methods 0.000 title claims abstract description 58
- 230000003068 static effect Effects 0.000 title claims abstract description 27
- 238000011068 loading method Methods 0.000 title abstract description 28
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 31
- 239000010959 steel Substances 0.000 claims abstract description 31
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 claims abstract description 9
- 230000007246 mechanism Effects 0.000 claims abstract description 5
- 238000006243 chemical reaction Methods 0.000 claims description 18
- 238000005096 rolling process Methods 0.000 claims 1
- 238000013461 design Methods 0.000 abstract description 9
- 238000010276 construction Methods 0.000 abstract description 5
- 238000007405 data analysis Methods 0.000 abstract description 2
- 238000012795 verification Methods 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 9
- 239000000945 filler Substances 0.000 description 5
- 238000005452 bending Methods 0.000 description 4
- 238000006073 displacement reaction Methods 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 238000002360 preparation method Methods 0.000 description 3
- 238000010998 test method Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000009417 prefabrication Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
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Abstract
The utility model discloses a precast beam monospar is loading frame for static test, the test platform comprises a pedestal, the pedestal top has set firmly experimental roof beam, experimental roof beam top has set firmly the distribution roof beam, the distribution roof beam top has set firmly the crossbeam, the steel sheet is installed at the crossbeam top, the jack is installed at the steel sheet top, the steel sheet is installed to the jack top, the sensor is installed at the steel sheet top, the steel sheet is installed at the sensor top, steel sheet top mounting panel has counter-force mechanism, and the monospar is statically loaded the bridge load test and is a verification means that carries out direct test to bridge construction operating condition, improves precast beam static test's accuracy, provides the data basis for later stage construction work. Meanwhile, the reasonability of the design scheme is verified through static test data analysis, the bridge is ensured to be in a good operation state, the bridge design level is improved, and design experience is enriched to provide a basis for other similar projects.
Description
Technical Field
The utility model relates to a precast beam field especially relates to a precast beam monospar loading frame for static test.
Background
The static load test is an identification means for directly testing the working state of the bridge structure. The working state and the stress performance of the bridge structure are judged by testing the static strain and the static deflection of the structure under the action of test load.
Most precast beams for road construction need static load tests during hoisting, the most common method is a stacking method, although the method is convenient to operate, labor is large, a large amount of labor force is needed for operation, and the method is still easily limited by a site, so that a loading frame for the single-beam static load test of the precast beams is designed.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a precast beam monospar is loading frame for static test for solve following problem.
The utility model discloses a solve above-mentioned technical problem, adopt following technical scheme to realize:
the utility model provides a precast beam monospar loading frame for static test, includes the pedestal, the pedestal top has set firmly experimental roof beam, experimental roof beam top has set firmly the distributive girder, the distributive roof beam top has set firmly the crossbeam, the steel sheet is installed at the crossbeam top, the jack is installed at the steel sheet top, the steel sheet is installed to the jack top, the sensor is installed at the steel sheet top, the steel sheet is installed at the sensor top, steel sheet top mounting panel has counter-force mechanism.
Preferably, counter-force mechanism includes reaction frame, nut, jib, support, counter weight frame, filler beam, the reaction frame is connected with the steel sheet, a plurality of jibs are installed to the reaction frame, the jib bottom has set firmly the filler beam, jib top and the equal threaded connection in bottom have the nut, are close to the nut and the reaction frame of reaction frame contact, are close to the nut and the filler beam of filler beam contact, the filler beam top has set firmly the counter weight roof beam, the counter weight roof beam top has set firmly the support, the support is connected with the reaction frame.
Preferably, the length of the distribution beam is the same as the width of the beam, the length of the reaction frame is eleven meters, the hanger rod is made of finish-rolled deformed steel bar with the diameter larger than thirty-six, the length of the hanger rod is five meters, the length of the cross beam is two meters, and the length of the pad beam is 3.5 meters.
Preferably, the vertical and horizontal deviations of the center of the jack and the loading center line of the test beam top are not more than 8mm, and the vertical and horizontal deviations of the center of the jack and the center of the beam are also not more than 8 mm.
Preferably, the sensor is a pressure sensor.
Preferably, the distribution beam, the reaction frame, the cross beam, the steel plate, the suspension rod, the balance weight frame and the pad beam are all made of Q345 steel.
The utility model has the advantages that:
the single-beam static load bridge load test is a verification means for directly testing the working state of a bridge structure, improves the accuracy of the precast beam static load test, and provides a data foundation for later construction work. Meanwhile, the reasonability of the design scheme is verified through static test data analysis, the bridge is ensured to be in a good operation state, the bridge design level is improved, and design experience is enriched to provide a basis for other similar projects.
The single-beam static load test method is simple, rapid to operate, good in equipment stability, high in precision, good in economic efficiency and high in efficiency, and can be easily accepted by construction units and is convenient to implement.
Drawings
Fig. 1 is a schematic structural view of the present invention;
fig. 2 is a top view of the present invention;
reference numerals: 1. a reaction frame; 2. a nut; 3. a boom; 4. a bolster; 5. a pedestal; 6. a counterweight beam; 7. a test beam; 8. a support; 9. a distribution beam; 10. a steel plate; 11. a sensor; 12. a jack; 13. a cross member.
Detailed Description
In order to make the technical means, the creation features, the achievement purposes and the functions of the present invention easy to understand, the present invention will be further explained below with reference to the following embodiments and the accompanying drawings, but the following embodiments are only the preferred embodiments of the present invention, and not all embodiments are included. Based on the embodiments in the embodiment, those skilled in the art can obtain other embodiments without making creative efforts, and all of them belong to the protection scope of the present invention.
Specific embodiments of the present invention will be described below with reference to the accompanying drawings.
As shown in the figures 1-2 of the drawings,
firstly, testing steps
1. Preparation of the test
(1) Test beam mounting
And (4) positioning and mounting the test beam, the loading frame and the counterweight beam, and measuring the height difference of the support by adopting a level gauge. The method comprises the following steps: the relative difference in height of roof beam both ends support is not more than 8mm, and same end both sides difference in height should not be greater than 3mm, and two branch point unevenness of experimental roof beam are not more than 3 mm. The actual measurement beam span after the test beam is installed meets the design span requirement of the test beam. And the safety protection is carried out on the test beam and the counterweight beam, so that the safety of personnel, instruments and equipment and structures is ensured when an accident situation occurs.
(2) Jack mounting
And laying a sand cushion layer and a steel base plate at the loading point, leveling the steel base plate by using a horizontal ruler, and then moving the steel base plate into a jack. The method comprises the following steps: the vertical and horizontal deviations of the center of the jack and the loading center line of the beam top (the center line of a web plate of the beam top) are not more than 8mm, and the vertical and horizontal deviations of the center of the jack and the loading center line of the beam of the loading frame are not more than 8 mm.
(3) Displacement meter mounting
The displacement meter support is erected according to test requirements, and the support is required to be firm and stable and is not influenced by deformation of a loading test pedestal; then, the testing party performs displacement meter installation and debugging according to the testing scheme, and reads the initial reading.
(4) Beam initial crack inspection
Before loading, the appearance of the lower edge and the bottom face of the beam in the range of 1/4 span on both sides of the span of the beam body is checked by a crack width tester, and the initial cracks (surface shrinkage cracks and surface damage cracks) and local defects are described in detail by a blue pencil.
2. Step of Loading test
And loading and holding are carried out strictly according to a test loading program. After each stage of loading, the lower edge and the bottom of the beam body are carefully checked for the occurrence of cracks. If cracks appear or initial crack extension occurs, the mark is marked by pencil, and the load grade and the crack width are noted. And simultaneously, measuring the mid-span deflection of the beam body and the support settlement.
(1) Test loading control
The loading equipment adopts a mechanical jack to manually load and unload, and the load is measured by a pressure sensor, so that each loading party can conveniently control the loading and the measuring party to measure.
(2) Test method
The strain measurement adopts a resistance strain gauge; and the displacement measurement is completed by adopting a YHJ-WDB30 electromechanical dial indicator, and the acquisition of all test data is completed by a static resistance strain gauge and a computer.
Second, static load test example
A35 m simply supported small box girder static load test technology by a certain highway prefabrication post-tensioning method.
1. Static load test work preparation
(1) And (4) installing a fixed support according to design requirements, centering and leveling, and controlling the error within 3 mm.
(2) Marking a beam body web plate, a span and a support center line on the top surface of the beam according to design requirements, marking 5 points of 0m, 7m, 14m, 21m, 28m and 35m along two sides of the web plate in the span as loading center points of the small box beam. And laying a sand cushion layer and a steel base plate at each loading point, leveling by using a horizontal ruler, and then moving into a jack. The vertical and horizontal position deviation between the jack center and the loading center of the beam body is not more than 8 mm.
(3) Matching, mounting positions and stability of the jack, the oil pump and the oil meter are checked by matching with a static load tester, and deflection measurement is carried out on the support seats at the two ends of the beam body and the span respectively through security dial indicators.
(4) Before loading, a technician carefully observes the original cracks of the beam body before loading by using a magnifying glass, can check the cracks by watering the beam body, and adopts a red pencil to carefully standard the cracks.
(5) The reaction frame is installed, and the base and the lower cross beam are placed on the test bed seat, so that the cross beams are on the same horizontal plane. And placing the lower part of the bridge support on the lower cross beam, and then moving the beam to be detected into position. And respectively placing the tension rod and the tension rod base plate in corresponding mounting hole positions, and assembling the protective cover on the tension rod. And placing the completely spliced truss on the detection beam by adopting 2 100-ton gantry cranes, and finely adjusting the level of the upper cross beam and the truss by using a jack so as to ensure that all parts of the test bed are uniformly stressed.
2. Test object and method
(1) The test purpose is as follows: the maximum deflection and deflection of the structure control interface; the occurrence and propagation of cracks, including the occurrence of initial cracks, the width, length, spacing, location, orientation and shape of cracks, and closure after unloading.
(2) The test method comprises the following steps: the structural deformation was tested using a dial gauge. And observing the cracks by using a scale magnifier.
3. Procedure of the test
The loading method comprises the following steps: the loading of the test beam was performed in two cycles. And expressing the loading grade by a loading coefficient k, wherein the loading coefficient k is the ratio of the bending moment born by the span of the beam body in the loading test to the designed bending moment. The load state borne by the beam body after the test preparation work is an initial state; the bending moment borne by the span of the base number level lower beam body refers to the sum of the mass of the beam body and the span bending moment of the second-stage constant load mass.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It should be understood by those skilled in the art that the present invention is not limited by the above embodiments, and the description in the above embodiments and the description is only preferred examples of the present invention, and is not intended to limit the present invention, and that the present invention can have various changes and modifications without departing from the spirit and scope of the present invention, and these changes and modifications all fall into the scope of the claimed invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (6)
1. The utility model provides a precast beam monospar load test uses load frame, includes pedestal (5), its characterized in that: pedestal (5) top has set firmly test roof beam (7), test roof beam (7) top has set firmly distributive girder (9), crossbeam (13) have set firmly at distributive girder (9) top, steel sheet (10) are installed at crossbeam (13) top, jack (12) are installed at steel sheet (10) top, steel sheet (10) are installed at jack (12) top, sensor (11) are installed at steel sheet (10) top, steel sheet (10) are installed at sensor (11) top, steel sheet (10) top mounting panel has counter-force mechanism.
2. The load carrier for precast beam single beam static load test according to claim 1, characterized in that: counter-force mechanism includes reaction frame (1), nut, jib (3), support (8), counter weight frame, pad roof beam (4), reaction frame (1) is connected with steel sheet (10), a plurality of jibs (3) are installed in reaction frame (1), jib (3) bottom has set firmly pad roof beam (4), jib (3) top and bottom all threaded connection have nut (2), are close to nut (2) and reaction frame (1) of reaction frame (1) contact, are close to nut (2) and pad roof beam (4) of pad roof beam (4) contact, pad roof beam (4) top has set firmly counter weight roof beam (6), counter weight roof beam (6) top has set firmly support (8), support (8) are connected with reaction frame (1).
3. The load carrier for precast beam single beam static load test according to claim 2, characterized in that: the length of the distribution beam (9) is the same as the width of the beam, the length of the reaction frame (1) is eleven meters, the hanger rod (3) adopts finish rolling deformed steel bar with the diameter larger than thirty-six, the length of the hanger rod (3) is five meters, the length of the cross beam (13) is two meters, and the length of the pad beam (4) is 3.5 meters.
4. The load carrier for precast beam single beam static load test according to claim 1, characterized in that: the vertical and horizontal deviation of the center of the jack (12) and the loading center line of the top of the test beam (7) is not more than 8mm, and the vertical and horizontal deviation of the center of the jack (12) and the center of the cross beam (13) is not more than 8 mm.
5. The load carrier for precast beam single-beam static load test according to claim 1, characterized in that: the sensor (11) is a pressure sensor.
6. The load carrier for precast beam single beam static load test according to claim 2, characterized in that: the distribution beam (9), the reaction frame (1), the cross beam (13), the steel plate (10), the suspender (3), the counterweight frame and the pad beam (4) are all made of Q345 steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221095323.XU CN217359367U (en) | 2022-05-09 | 2022-05-09 | Loading frame for precast beam single-beam static load test |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221095323.XU CN217359367U (en) | 2022-05-09 | 2022-05-09 | Loading frame for precast beam single-beam static load test |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217359367U true CN217359367U (en) | 2022-09-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221095323.XU Expired - Fee Related CN217359367U (en) | 2022-05-09 | 2022-05-09 | Loading frame for precast beam single-beam static load test |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217359367U (en) |
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2022
- 2022-05-09 CN CN202221095323.XU patent/CN217359367U/en not_active Expired - Fee Related
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Granted publication date: 20220902 |
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