CN115450270A - Loading method for prestress box girder bearing capacity failure test - Google Patents
Loading method for prestress box girder bearing capacity failure test Download PDFInfo
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- CN115450270A CN115450270A CN202211317360.5A CN202211317360A CN115450270A CN 115450270 A CN115450270 A CN 115450270A CN 202211317360 A CN202211317360 A CN 202211317360A CN 115450270 A CN115450270 A CN 115450270A
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- box girder
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D33/00—Testing foundations or foundation structures
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2/00—Bridges characterised by the cross-section of their bearing spanning structure
- E01D2/04—Bridges characterised by the cross-section of their bearing spanning structure of the box-girder type
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
- G01N3/12—Pressure testing
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2600/00—Miscellaneous
- E02D2600/10—Miscellaneous comprising sensor means
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Abstract
The invention relates to the technical field of municipal bridge engineering, in particular to a loading method for a prestressed box girder bearing capacity failure test, which comprises the following steps: placing a first stress part on a first cushion block, and placing a jacking mechanism and a second cushion block on the first stress part; a second stress component is arranged above the second cushion block; fixing the same end parts of the first stressed component and the second stressed component together by using two fastening tools respectively; at least one of the first stress part and the second stress part is a prestressed box girder; the jacking mechanism jacks until the prestressed box girder in the first stress part and the second stress part is damaged, and the pressure sensor is arranged on the jacking mechanism and used for collecting mechanical data when the prestressed box girder is damaged.
Description
Technical Field
The invention relates to the technical field of municipal bridge engineering, in particular to a loading method for a prestress box girder bearing capacity failure test.
Background
The prestressed box girder has the advantages of low cost, convenient construction, good torsion resistance and the like, is widely applied to municipal bridge engineering, and forms a perfect design theory and a mature construction method in the industry at present. However, with the research, development and popularization of new materials and new technologies, the bearing performance of the prestressed box girder still needs to be researched.
The bearing capacity failure test is an important method for revealing the structural mechanical property, the ultimate bearing capacity and the crack development rule of the prestressed box girder, however, in order to meet the test loading requirement, a reaction frame needs to be built, and a foundation needs to be newly built if necessary, so that the problems of long test period, high cost and the like are faced, and how to reduce the loading cost is a technical problem to be solved urgently in the test research process.
Disclosure of Invention
The invention aims to overcome the defects that a reaction frame needs to be additionally built and a foundation needs to be reinforced in the prior art, and provides a loading method for a prestressed box girder bearing capacity failure test.
The invention solves the technical problems through the following technical scheme:
a loading method for a prestressed box girder bearing capacity failure test comprises the following steps:
placing a first stress part on a first cushion block, and placing a jacking mechanism and a second cushion block on the first stress part;
a second stress component is placed above the second cushion block;
fixing the same end parts of the first stress part and the second stress part together by using two fastening tools respectively;
at least one of the first stress-bearing part and the second stress-bearing part is a prestressed box girder;
the jacking mechanism jacks until the prestressed box girders in the first stress part and the second stress part are damaged;
the jacking mechanism is provided with a pressure sensor, and the pressure sensor is used for collecting mechanical data when the prestressed box girder is damaged.
In this scheme, climbing mechanism places in the centre of first atress part and second atress part to realize the internal force and to drawing the loading, need not additionally to build reaction frame, overcome the restriction that the ground bore the weight of the condition simultaneously, be favorable to reducing test cost.
Preferably, the first force-bearing part and the second force-bearing part are both prestressed box girders.
In this scheme, adopt above-mentioned structural style, the one-time test can be loaded two prestressing force case roof beams simultaneously, is favorable to shortening test cycle.
Preferably, the jacking mechanisms are placed at three points of the prestressed box girder.
In the scheme, the adoption of the structural form can ensure that the middle section of the prestressed box girder forms a pure bending section, facilitate the research on the mechanical property of the prestressed box girder and meet the loading requirement of a bearing capacity test.
Preferably, the jacking mechanism is a hydraulic jack, and the bearing capacity of the hydraulic jack is greater than the pressure when the prestressed box girder is damaged.
In this scheme, adopt hydraulic jack to be convenient for operate, and the hydraulic jack who just adopts can satisfy anticipated load requirement.
Preferably, the pressure sensor is electrically connected to a collecting instrument, and the collecting instrument acquires mechanical data of the pressure sensor in real time and transmits the mechanical data to the analysis unit.
In this scheme, adopt above-mentioned structural style, the experimenter can learn the mechanics data that detect in real time, can in time analyze the mechanical properties, the ultimate bearing capacity of judging the prestressing force case roof beam.
Preferably, the pressure sensor is a column pressure sensor.
In this solution, the pillar type pressure sensor is an ideal choice for installation in a limited space and has excellent long-term stability.
Preferably, the acquisition instrument is a DH3819 wireless static strain acquisition instrument.
In this scheme, adopt foretell collection appearance, can accurate, reliable, obtain experimental mechanics data fast.
Preferably, the fastening means is a steel cable.
In the scheme, the steel cable is used as a fastening tool, so that the steel cable has high strength, light dead weight and reliable work.
Preferably, the first cushion block and the second cushion block are wood blocks, and the width of each wood block is greater than or equal to that of the prestressed box girder.
In this scheme, adopt the billet as the cushion, with low costs, easily obtain to the width of billet needs the width that is greater than or equal to prestressing force case roof beam, guarantees that prestressing force case roof beam atress is even in the test process.
The positive progress effects of the invention are as follows:
according to the loading method for the prestressed box girder bearing capacity destructive test, the jacking mechanism is placed between two prestressed box girders or between one prestressed box girder and one stress part, so that internal force counter-pulling loading is realized, a reaction frame does not need to be additionally built, the limitation of foundation bearing conditions is overcome, and the test cost is favorably reduced.
Drawings
Fig. 1 is a schematic front view of a loading method for a prestressed box girder bearing capacity failure test according to a preferred embodiment of the present invention.
FIG. 2 is a schematic side view of the loading method for the prestressed box girder load-bearing failure test according to the preferred embodiment of the present invention.
FIG. 3 is a block diagram of a pressure detection system according to a preferred embodiment of the present invention.
Description of the reference numerals:
first prestressed box girder 10
Second prestressed box girder 20
Detailed Description
The invention is further illustrated by the following examples, which are not intended to limit the invention thereto.
As shown in fig. 1 to 3, the embodiment provides a loading method for a prestressed box girder bearing capacity failure test, which includes the following steps:
placing a first stress part on the first cushion block 40, and placing a jacking mechanism 30 and a second cushion block 50 on the first stress part;
a second force-bearing part is arranged above the second cushion block 50;
two fastening appliances 60 are used to secure the same ends of the first and second force-bearing parts together,
at least one of the first stress part and the second stress part is a prestressed box girder;
the jacking mechanism 30 jacks until the prestressed box girders in the first stress part and the second stress part are damaged;
the jacking mechanism 30 is provided with a pressure sensor 70, and the pressure sensor 70 is used for collecting mechanical data when the prestressed box girder is damaged.
The above sequence is a preferred sequence of steps of the present invention, but is not limited thereto, and in other alternative embodiments, other sequences may be used, for example, the jacking mechanism 30 may not be placed on the first force-bearing component in advance, and the jacking mechanism 30 may be placed after the first force-bearing component and the second force-bearing component are placed.
Specifically, at least one of the first stress-bearing part and the second stress-bearing part is required to be a prestressed box girder, that is, one stress-bearing part and one prestressed box girder are tested or both of the first stress-bearing part and the second stress-bearing part are tested.
In this embodiment, first atress part and second atress part all are prestressing force case roof beam, what place earlier is first prestressing force case roof beam 10, what place above second cushion 50 is second prestressing force case roof beam 20, second prestressing force case roof beam 20 aligns and puts upside down in the top of first prestressing force case roof beam 10, because climbing mechanism 30 places in the centre of first prestressing force case roof beam 10 and second prestressing force case roof beam 20, can realize internal force counter-pull loading, need not additionally to build the reaction frame, the restriction of foundation bearing condition has been overcome simultaneously, be favorable to reducing test cost.
As shown in fig. 1, the jacking mechanism 30 is placed at three points of the prestressed box girder, so as to ensure that the middle section forms a pure bending section, facilitate the research of the mechanical properties of the prestressed box girder, and meet the loading requirements of the bearing capacity test. In this embodiment, the jacking mechanism 30 is a hydraulic jack, and the hydraulic jack lifts and loads between two prestressed box girders until the prestressed box girders are damaged, so that the adopted hydraulic jack is required to meet the expected load requirement, and the bearing capacity of the hydraulic jack is greater than the pressure when the prestressed box girders are damaged.
In alternative embodiments, other jacking mechanisms 30 may be used, such as screw jacks, cylinders, gear lift members, and the like.
In this embodiment, the pressure sensor 70 is a column pressure sensor 70 installed on a top cover of a hydraulic jack, the column pressure sensor 70 is an ideal choice for installation in a limited space and has excellent long-term stability, although other suitable types of pressure sensors 70 may also be used, the pressure sensor 70 is electrically connected to the collector 80, the pressure sensor 70 detects the pressure applied to the prestressed box girder during the jacking process, the collector 80 acquires the mechanical data of the pressure sensor 70 in real time and transmits the mechanical data to the analysis unit 90, the pressure sensor 70, the collector 80 and the analysis unit 90 form a pressure detection system of the present invention, the detection process is shown in fig. 3, in this embodiment, the collector 80 is a DH3819 wireless static strain collector 80, in other alternative embodiments, other types of collectors 80 may also be used, the analysis unit 90 is a computer, a computing device, etc. having a data processing function, and the mechanical data collected by the collector 80 is analyzed and processed by using the analysis unit 90, so as to study the mechanical performance of the prestressed box girder, where the electrical connection includes connection by wires, and other signal connection manners including wireless communication, so as to realize the transmission of the mechanical data.
As shown in fig. 1, two fasteners 60 are respectively used to fix the same ends of the first prestressed box girder 10 and the second prestressed box girder 20 together to form an internal force split structure, in this embodiment, the fasteners 60 are steel cables, and in other alternative embodiments, other fasteners 60, such as a chain, may be used.
In this embodiment, the first cushion block 40 and the second cushion block 50 are both wood blocks, the wood blocks are used for reserving enough space, so as to facilitate hoisting of the box girder, installation of the jack, acquisition of test data and the like, and the width of the wood blocks needs to be greater than or equal to that of the prestressed box girder, so that the prestressed box girder is ensured to be uniformly stressed in the test process. In alternative embodiments, other materials may be used for the spacer, such as iron or steel plates.
The invention provides a prestressed box girder bearing capacity destructive test loading method, which adopts two prestressed box girders or one prestressed box girder and one stress part for testing, and a jacking mechanism 30 is arranged between the two prestressed box girders or the one prestressed box girder and the one stress part to realize the internal force opposite-pulling loading. In the prior art, when a box girder bearing capacity failure test is carried out, support columns need to be built, reaction frames are arranged on the two support columns, so that the recoil force generated when a jack is loaded is born, in addition, a foundation needs to be reinforced, the foundation failure is prevented, and the problems of long test period, high cost and the like exist.
In the description of the present invention, it is to be understood that the terms "first", "second", and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to imply that the number of technical features indicated are explicitly or implicitly. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more features.
While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that this is by way of example only, and that the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and scope of the invention, and these changes and modifications are within the scope of the invention.
Claims (10)
1. A loading method for a prestress box girder bearing capacity failure test is characterized by comprising the following steps:
placing a first stress part on a first cushion block, and placing a jacking mechanism and a second cushion block on the first stress part;
a second stress component is arranged above the second cushion block;
fixing the same end parts of the first stress part and the second stress part together by using two fastening tools respectively;
at least one of the first stress part and the second stress part is a prestressed box girder;
the jacking mechanism jacks until the prestressed box girders in the first stress part and the second stress part are damaged;
the jacking mechanism is provided with a pressure sensor, and the pressure sensor is used for collecting mechanical data when the prestressed box girder is damaged.
2. The prestressed box girder endurance failure test loading method according to claim 1, wherein said first force-receiving member and said second force-receiving member are both prestressed box girders.
3. The prestressed box girder endurance failure test loading method according to claim 1, wherein said jacking mechanisms are placed at three points of the prestressed box girder.
4. The prestressed box girder endurance failure test loading method according to claim 3, wherein said jacking mechanism is a hydraulic jack.
5. The prestressed box girder endurance failure test loading method according to claim 4, wherein the load capacity of said hydraulic jack is greater than the pressure at which the prestressed box girder is broken.
6. The loading method for the prestress box girder bearing capacity failure test of claim 1, wherein the pressure sensor is electrically connected to a collecting instrument, and the collecting instrument acquires mechanical data of the pressure sensor in real time and transmits the mechanical data to an analysis unit.
7. The prestressed box girder endurance failure test loading method according to claim 6, wherein said pressure sensor is a column type pressure sensor.
8. The loading method for the prestress box girder bearing capacity failure test of claim 6, wherein the acquisition instrument is a DH3819 wireless static strain acquisition instrument.
9. The prestressed box girder endurance failure test loading method according to claim 1, wherein said fastening means is a steel cable.
10. The prestressed box girder breaking test loading method according to claim 1, wherein the first and second spacers are wood blocks, and the width of the wood blocks is greater than or equal to the width of the prestressed box girder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211317360.5A CN115450270A (en) | 2022-10-26 | 2022-10-26 | Loading method for prestress box girder bearing capacity failure test |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211317360.5A CN115450270A (en) | 2022-10-26 | 2022-10-26 | Loading method for prestress box girder bearing capacity failure test |
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| CN115450270A true CN115450270A (en) | 2022-12-09 |
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| CN202211317360.5A Pending CN115450270A (en) | 2022-10-26 | 2022-10-26 | Loading method for prestress box girder bearing capacity failure test |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101101249A (en) * | 2007-07-31 | 2008-01-09 | 中铁二局股份有限公司 | 32m/900t prestressed concrete pretension box beam static loading test method |
| CN203385620U (en) * | 2013-08-14 | 2014-01-08 | 王鹏 | Static-load test rack of concrete bridge |
| CN104280297A (en) * | 2014-09-23 | 2015-01-14 | 同济大学 | Counterforce beam loading device and loading method for static load test of bridge beam body |
| CN107340185A (en) * | 2017-06-22 | 2017-11-10 | 北京华横新技术开发公司 | A kind of bridge static loading test pre-stressed steel pipe concrete self-balancing type static test bed |
| CN111665137A (en) * | 2020-07-29 | 2020-09-15 | 重庆交通大学 | Highway single-beam static load test system |
| CN111766150A (en) * | 2020-07-29 | 2020-10-13 | 重庆交通大学 | Loading counterforce device used for high-speed rail box girder static load test |
| KR20210045718A (en) * | 2019-10-17 | 2021-04-27 | (주)페트라텍 | Beam-column corner joint load test equipment |
| CN213239481U (en) * | 2020-11-13 | 2021-05-18 | 郑州大学 | Precast beam static load test device |
-
2022
- 2022-10-26 CN CN202211317360.5A patent/CN115450270A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101101249A (en) * | 2007-07-31 | 2008-01-09 | 中铁二局股份有限公司 | 32m/900t prestressed concrete pretension box beam static loading test method |
| CN203385620U (en) * | 2013-08-14 | 2014-01-08 | 王鹏 | Static-load test rack of concrete bridge |
| CN104280297A (en) * | 2014-09-23 | 2015-01-14 | 同济大学 | Counterforce beam loading device and loading method for static load test of bridge beam body |
| CN107340185A (en) * | 2017-06-22 | 2017-11-10 | 北京华横新技术开发公司 | A kind of bridge static loading test pre-stressed steel pipe concrete self-balancing type static test bed |
| KR20210045718A (en) * | 2019-10-17 | 2021-04-27 | (주)페트라텍 | Beam-column corner joint load test equipment |
| CN111665137A (en) * | 2020-07-29 | 2020-09-15 | 重庆交通大学 | Highway single-beam static load test system |
| CN111766150A (en) * | 2020-07-29 | 2020-10-13 | 重庆交通大学 | Loading counterforce device used for high-speed rail box girder static load test |
| CN213239481U (en) * | 2020-11-13 | 2021-05-18 | 郑州大学 | Precast beam static load test device |
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