CN111397820A - Method for detecting bearing capacity of temporary steel trestle bridge in construction in alpine region - Google Patents
Method for detecting bearing capacity of temporary steel trestle bridge in construction in alpine region Download PDFInfo
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- CN111397820A CN111397820A CN202010192970.1A CN202010192970A CN111397820A CN 111397820 A CN111397820 A CN 111397820A CN 202010192970 A CN202010192970 A CN 202010192970A CN 111397820 A CN111397820 A CN 111397820A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M5/00—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings
- G01M5/0008—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings of bridges
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M5/00—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings
- G01M5/0025—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings of elongated objects, e.g. pipes, masts, towers or railways
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M5/00—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings
- G01M5/0041—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings by determining deflection or stress
- G01M5/005—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings by determining deflection or stress by means of external apparatus, e.g. test benches or portable test systems
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M5/00—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings
- G01M5/0066—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings by exciting or detecting vibration or acceleration
Abstract
The invention provides a method for detecting the bearing capacity of a temporary steel trestle bridge constructed in a severe cold area, which comprises the following steps: step one, intercepting a section of a standard steel trestle as a test bridge deck; secondly, mounting various sensors at measuring points of the Bailey beam, the I-shaped steel beam and the steel pipe pile respectively; thirdly, arranging the load on the testing bridge deck, performing static load testing, obtaining static load testing results detected by various sensors, and simultaneously obtaining static deflection measuring results; step four, enabling the load to pass through the detection bridge floor for three times, performing dynamic load test, obtaining dynamic load test results detected by various sensors, and simultaneously obtaining dynamic deflection measurement results; and step five, comparing each test result with each standard value respectively, and judging whether the steel trestle is qualified. The invention can quickly and effectively evaluate the service performance and the current working state of the steel trestle, thereby ensuring the reliability of the steel trestle in the operation process and ensuring the safety of engineering personnel.
Description
Technical Field
The invention relates to a method for detecting the bearing capacity of a temporary steel trestle bridge constructed in a severe cold area, and belongs to the field of bridge construction.
Background
The temporary bridge structures such as the steel trestle bridge in the marine environment are seriously eroded by seawater, and the water flow and wave action of the seawater are large, so that great hidden danger is brought to the safety of the temporary bridge structure. For a steel trestle in an alpine region, the steel materials can be subjected to cold brittleness in winter; meanwhile, the temporary structure of the steel trestle has long construction length and complex construction environment, generally, corrosion phenomenon occurs when steel is not timely operated after entering a construction site, and the bearing capacity of the steel trestle is greatly reduced due to various reasons, so that the detection of the bearing capacity of the steel trestle is very important for ensuring the safety of engineering and related personnel. The invention provides a detection method aiming at the bearing capacity of a temporary steel trestle constructed in an alpine region, and the detection method can be used for quickly and effectively evaluating the service performance and the current working state of the steel trestle so as to ensure the reliability of the steel trestle in the operation process and ensure the safety of engineering personnel.
Disclosure of Invention
The invention aims to provide a method for detecting the bearing capacity of a temporary steel trestle bridge constructed in an alpine region, and aims to solve the problem that the service performance of the temporary steel trestle bridge constructed in the alpine region cannot be quickly and effectively evaluated.
A method for detecting the bearing capacity of a temporary steel trestle bridge in construction in alpine regions comprises the following steps:
step one, intercepting a section of a standard steel trestle as a test bridge deck;
secondly, mounting various sensors at measuring points of the Bailey beam, the I-shaped steel beam and the steel pipe pile respectively, and connecting wires to an acquisition instrument for data collection;
thirdly, three muck vehicles are adopted as loads to be arranged on a testing bridge floor for static load testing, static load testing results detected by the various sensors are obtained, and static deflection measuring results are obtained at the same time;
step four, driving the slag car as a load for three times through the detection bridge floor, and performing dynamic load test to obtain dynamic load test results detected by the various sensors and a dynamic deflection measurement result;
and step five, comparing the static load test result, the dynamic load test result, the static deflection measurement result and the dynamic deflection measurement result with respective standard values, and judging whether the steel trestle is qualified.
Further, in the step one, the intercepted steel trestle is a three-span trestle, and the three-span trestle comprises 4 supports and 3 continuous beams.
Further, the plurality of sensors includes a plurality of strain gauges, a plurality of vibration pickups, and an electronic level.
Further, in the second step, 17 sensors are mounted on the bailey beam, 4 sensors are mounted on the i-beam, and 6 sensors are mounted on the steel pipe pile.
Further, the sensors mounted on the beret beam are 14 strain gauges and 3 vibration pickups, wherein the 14 strain gauges are respectively mounted on the lower flange of the three-span mid-section beret beam and the upper flanges of the 4 support-section beret beams, and the 3 vibration pickups are respectively mounted on the mid-span bridge deck.
Furthermore, 4 sensors arranged on the steel I-beam are respectively arranged on the steel I-beam at the positions of the 4 supports.
Further, the 6 sensors mounted on the steel pipe piles are respectively mounted on respective test sections of two adjacent steel pipe piles, and each test section is provided with 3 sensors.
Furthermore, the electronic level is placed on the stable ground beside the bridge and used for observing the vertical displacement of the measuring point, namely used for deflection measurement.
Further, in step three, the method comprises the following steps:
step three, arranging three muck trucks as loads on a three-span to obtain a first static load test result;
step two, arranging three muck vehicles serving as loads on 3 continuous supports to obtain a second static load test result;
furthermore, in the fourth step, the speed of the muck vehicle driving through the test bridge deck for three times is 15 km/h.
The main advantages of the invention are:
(1) the detection speed is high and the precision is high. And the synchronous detection is carried out on multiple positions and multiple points of the steel trestle, so that the detection precision and accuracy are ensured. The detection instrument is convenient and quick to mount and dismount, and the steel trestle structure cannot be damaged.
(2) The detection cost is low. The detection instrument used by the invention has lower cost, and the measurement precision is ensured by the advancement of the detection method instead of using a precision instrument.
Drawings
FIG. 1 is a structural view of a steel temporary bridge for certain bridge construction, wherein FIG. 1(a) is an elevation view; FIG. 1(b) is a plan view; FIG. 1(c) is a side view;
FIG. 2 is a schematic view of a design use load, wherein FIG. 2(a) is a schematic view of a vehicle load; FIG. 2(b) is a schematic view of lane loading;
FIG. 3 is a schematic load diagram of a crawler crane, wherein FIG. 3(a) is a load distribution diagram; FIG. 3(b) is a schematic view of a single side track;
FIG. 4 is a schematic view of a muck truck load;
FIG. 5 is a schematic representation of a test cross-section;
FIG. 6 is a muck truck load condition diagram, wherein FIG. 6(a) is a schematic diagram of muck truck loads arranged in a bay; FIG. 6(b) is a schematic view of a muck truck load disposed on a support;
FIG. 7 is a representation of a crawler crane load condition, wherein FIG. 7(a) is a schematic view of a crawler crane load disposed in an intermediate bay; FIG. 7(b) is a schematic view of a crawler crane load being disposed in an endbay; FIG. 7(c) is a schematic view of a crawler load being placed on a support;
fig. 8 is a schematic diagram of the beret beam strain gauge, wherein fig. 8(a) is a schematic diagram of the longitudinal bridge position of the beret beam strain gauge;
fig. 8(b) is a schematic diagram of the transverse bridge position of the strain measuring point of the beret beam. (ii) a
FIG. 9 is a schematic diagram of an I-beam strain measurement point, wherein FIG. 9(a) is a schematic diagram of a longitudinal bridge position of the I-beam strain measurement point; FIG. 9(b) is a schematic diagram of the transverse bridge position of the I-steel strain measurement point;
fig. 10 is a schematic diagram of a strain measuring point of the steel pipe pile, wherein fig. 10(a) is a schematic diagram of a longitudinal bridge position of the strain measuring point of the steel pipe pile; FIG. 10(b) is a schematic diagram of the transverse bridge position of a strain measurement point of the steel pipe pile; FIG. 10(c) is a schematic plan view of a strain measurement point of a single steel pipe pile;
fig. 11 is a view of the erection of the test equipment, wherein fig. 11(a) is a schematic view of the installation of the sensor arrangement on the bottom flange of the bailey truss; FIG. 11(b) is a schematic view of the installation of the sensor arrangement on the bottom flange of the Bailey truss; FIG. 11(c) is a schematic view of the installation of the sensor arrangement on the upper flange of the I-beam; FIG. 11(d) shows the mounting points of the sensors on the steel pipe pile; FIG. 11(e) is a field measurement diagram of a vibrating wire strain gauge;
FIG. 12 is a schematic diagram of deflection point locations.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1 to 12, the invention provides an embodiment of a method for detecting the bearing capacity of a temporary steel trestle bridge constructed in an alpine region, and the method comprises the following steps:
step one, intercepting a section of a steel trestle as a test bridge deck;
secondly, mounting various sensors at measuring points of the Bailey beam, the I-shaped steel beam and the steel pipe pile respectively, and connecting wires to an acquisition instrument for data collection;
thirdly, three muck vehicles are adopted as loads to be arranged on the testing bridge floor for static load testing, static load testing results detected by various sensors are obtained, and static deflection measuring results are obtained at the same time;
step four, driving the slag car as a load for three times through the detection bridge floor, and performing dynamic load test to obtain dynamic load test results detected by various sensors and a dynamic deflection measurement result;
and step five, comparing the static load test result, the dynamic load test result, the static deflection measurement result and the dynamic deflection measurement result with respective standard values, and judging whether the steel trestle is qualified.
Specifically, as shown in fig. 7, in the static load test in the step three, the crawler crane can also be used to replace three muck trucks as loads, specifically, the load of the crawler crane can be arranged in the middle span first, and the maximum bending moment in the middle span of the bailey beam is tested; arranging the load of the crawler crane in the side span, and testing the maximum bending moment in the side span of the Bailey beam; and finally, arranging the load of the crawler crane at the support, and testing the maximum vertical force of the steel pipe pile and the maximum bending moment of the I-shaped steel beam.
Referring to fig. 5-10, in the preferred embodiment of this section, in step one, the steel trestle is cut out as a three-span trestle, which includes 4 supports and 3 continuous beams.
Specifically, the total length of the construction steel temporary bridge to be detected in the embodiment is 270m, the span is 30 × 9m, the width of the temporary bridge is 6 m, the longitudinal axis of the trestle is relatively parallel to the longitudinal axis of the main bridge, the distance is 4m, the lower structure adopts a steel pipe pile foundation, the upper structure adopts a Bailey beam, and the bridge structure is arranged as shown in fig. 1.
The test data is compared with the simulation result to judge the effectiveness and accuracy of the model, and the bridge span with complete structural system, complete component strength and size, no corrosion or other damage and firm connection is selected for testing.
Considering that the stress of the continuous beam with more than 3 spans is very close to that of the continuous beam with 3 spans, in order to simplify calculation and test workload, the trestle model and the test bridge span adopt a 3-span trestle (or determined according to the specific condition that the field trestle is a few-span continuous beam).
The muck truck adopted in the embodiment is a common six-wheel muck truck, the load distribution ratio of the front axle/the rear axle of the truck used in the test is 0.1193:1, and the specific total weight can be adjusted according to the requirement.
In some preferred embodiments, the plurality of sensors includes a plurality of strain gauges, a plurality of vibration pickups, and an electronic level.
Specifically, in the present embodiment, a JMZX-212 strain gauge is used as the plurality of strain gauges, and a vibration pickup DH561V is used as the plurality of vibration pickups.
Referring to fig. 8 to 10, in the present preferred embodiment, in the second step, 17 sensors are mounted on the bery beam, 4 sensors are mounted on the i-beam, and 6 sensors are mounted on the steel pipe pile.
Referring to fig. 8, in the preferred embodiment of this section, the sensors mounted on the beret beam are 14 strain gauges and 3 vibration pickups, wherein 14 strain gauges are mounted on the lower flange of the three-span mid-section beret beam and the upper flange of the 4-pedestal-section beret beam, respectively, and 3 vibration pickups are mounted on the mid-span bridge deck, respectively.
Specifically, the arrangement of 14 strain gauges corresponds to symmetrical load in the transverse direction because the load is generally arranged at the center of the trestle in the transverse direction. Two of the four beret beams are selected at each measuring point for measurement, and the selection of the two beret beams is shown in fig. 8-b. There are 14 stations.
Referring to fig. 9, in the preferred embodiment of this section, 4 sensors mounted on the i-section steel beams are mounted on the i-section steel at 4 mounts, respectively.
Referring to fig. 10, in the present preferred embodiment, 6 sensors mounted on the steel pipe piles are respectively mounted on respective test sections of two adjacent steel pipe piles, and each test section is provided with 3 sensors.
Specifically, in order to arrange measuring points conveniently, a measuring section is selected near the upper part of the steel pipe pile. And (3) selecting two steel pipe piles shown in the figure for measurement by considering the load working condition and the symmetry of the three-span test bridge span, wherein each test section is provided with 3 test points because the load is transmitted to the steel pipe piles through the I-shaped steel beams to have a certain bias effect. There are 6 stations.
In the preferred embodiment of this part, the electronic level is placed on the stable ground beside the bridge and is used for observing the vertical displacement of the measuring point, namely for measuring the deflection.
Specifically, the electronic level is placed on the stable ground beside a bridge to observe a measuring point, the vertical displacement of the measuring point is observed, a reinforcing steel bar head can be welded by a simple measuring point setting method, and a mark point mark can be pasted by a complex method.
In the preferred embodiment of this section, in step three, the following steps are included:
step three, arranging three muck trucks as loads on a three-span to obtain a first static load test result;
step two, arranging three muck vehicles serving as loads on 3 continuous supports to obtain a second static load test result;
in the preferred embodiment of the part, in the fourth step, the speed of driving the muck vehicle for three times through the test bridge floor is 15 km/h.
The deflection measuring equipment is characterized in that an electronic level is placed on the stable ground beside a bridge to observe a measuring point, the vertical displacement of the measuring point is observed, a reinforcing steel bar head can be welded by a simple measuring point setting method, and a mark point mark can be pasted by a complex method.
Claims (10)
1. A method for detecting the bearing capacity of a temporary steel trestle bridge in construction in alpine regions is characterized by comprising the following steps:
step one, intercepting a section of a standard steel trestle as a test bridge deck;
secondly, mounting various sensors at measuring points of the Bailey beam, the I-shaped steel beam and the steel pipe pile respectively, and connecting wires to an acquisition instrument for data collection;
thirdly, three muck vehicles are adopted as loads to be arranged on a testing bridge floor for static load testing, static load testing results detected by the various sensors are obtained, and static deflection measuring results are obtained at the same time;
step four, driving the slag car as a load for three times through the detection bridge floor, and performing dynamic load test to obtain dynamic load test results detected by the various sensors and a dynamic deflection measurement result;
and step five, comparing the static load test result, the dynamic load test result, the static deflection measurement result and the dynamic deflection measurement result with respective standard values, and judging whether the steel trestle is qualified.
2. The method for detecting the bearing capacity of the temporary steel trestle constructed in the alpine region according to claim 1, wherein in the step one, the intercepted steel trestle is a three-span trestle, and the three-span trestle comprises 4 supports and 3 continuous beams.
3. The method for detecting the bearing capacity of the temporary steel trestle bridge in the construction of the alpine region according to claim 1, wherein the sensors comprise strain gauges, vibration pickups and electronic levels.
4. The method for detecting the bearing capacity of the temporary steel trestle bridge in the alpine region during construction according to claim 2, wherein in the second step, 17 sensors are mounted on the bailey beam, 4 sensors are mounted on the i-beam, and 6 sensors are mounted on the steel pipe pile.
5. The method for detecting the bearing capacity of the temporary steel trestle bridge constructed in the alpine region according to claim 4, wherein the sensors mounted on the Bailey beam are 14 strain gauges and 3 vibration pickups, wherein the 14 strain gauges are respectively mounted on a lower flange of the three-span mid-section Bailey beam and an upper flange of the 4 support-section Bailey beam, and the 3 vibration pickups are respectively mounted on the mid-span bridge deck.
6. The method for detecting the bearing capacity of the temporary steel trestle bridge in the alpine region during construction according to claim 4, wherein the 4 sensors mounted on the I-shaped steel beams are respectively mounted on the I-shaped steel at the 4 supports.
7. The method for detecting the bearing capacity of the temporary steel trestle bridge in the alpine region during construction according to claim 4, wherein the 6 sensors mounted on the steel pipe piles are respectively mounted on respective test sections of two adjacent steel pipe piles, and each test section is provided with 3 sensors.
8. The method for detecting the bearing capacity of the temporary steel trestle bridge in the alpine region during construction according to claim 2, wherein the electronic level is placed on the stable ground beside the bridge and used for observing the vertical displacement of the measuring point, namely, used for deflection measurement.
9. The method for detecting the bearing capacity of the temporary steel trestle bridge constructed in the alpine region according to claim 2, wherein in the third step, the method comprises the following steps:
step three, arranging three muck trucks as loads on a three-span to obtain a first static load test result;
and step two, arranging the three muck vehicles serving as loads on 3 continuous supports to obtain a second static load test result.
10. The method for detecting the bearing capacity of the temporary steel trestle bridge constructed in the alpine region according to claim 2, wherein in the fourth step, the speed of driving the muck vehicle for three times over the test bridge floor is 15 km/h.
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| CN202010192970.1A CN111397820A (en) | 2020-03-18 | 2020-03-18 | Method for detecting bearing capacity of temporary steel trestle bridge in construction in alpine region |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113916146A (en) * | 2021-11-11 | 2022-01-11 | 深圳高速公路股份有限公司 | Bridge splicing seam vehicle-induced vibration deformation monitoring and control system and method |
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