CN102998168A - Fixing device for load test of pre-stressed concrete beam and testing method - Google Patents
Fixing device for load test of pre-stressed concrete beam and testing method Download PDFInfo
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- CN102998168A CN102998168A CN2012105000403A CN201210500040A CN102998168A CN 102998168 A CN102998168 A CN 102998168A CN 2012105000403 A CN2012105000403 A CN 2012105000403A CN 201210500040 A CN201210500040 A CN 201210500040A CN 102998168 A CN102998168 A CN 102998168A
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Abstract
The invention provides a fixing device for a load test of a pre-stressed concrete beam and a testing method. The fixing device comprises two horizontal test beams with opposite flange boards which are taken as counter-force frames; fixing frames for surrounding the periphery of the end parts of the test frames are respectively arranged at the two ends of the two test beams; each fixing frame comprises an upper bearing board, a lower bearing board, a left bearing board and a right bearing board, and the end parts of all the bearing boards are connected with one another to define a framework structure; the lower lateral faces of flange boards of the test beams are located on the lower bearing boards; the left bearing boards are in contact with the bottom face of the end part of a web plate of one test beam, and the right bearing boards are in contact with the bottom face of the end part of a web plate of the other test beam; and a transverse load jack is arranged between the two test beams. The fixing device provided by the invention has the advantages of simple structure, convenience in manufacturing and use, and no damage on the beam; and the testing method in the load test with the fixing device has no need of a great number of real objects with load, and facilitates the test in situ.
Description
Technical field
The present invention relates to the building structure technology field, the stationary installation of test beam and the improved improvement of method of testing when being specifically related to the actual carrying capacity by loading test test prestressed concrete beam.
Background technology
At present, known prestressed concrete beam loading test generally is to carry out in the laboratory of colleges and universities, scientific research institutions, during test test beam is positioned on the large-scale pressure testing machine to load.For the beams of concrete of making at the scene or be placed in prestressed concrete beam in the Practical Project (comprise use a period of time after, the prestressed concrete beam that need are identified bearing capacity by loading test), if need to test its actual carrying capacity by loading test, two kinds of methods are arranged: the one, beams of concrete is pulled down, transport the laboratory to, test with pressure testing machine; The 2nd, directly carry out at the scene loading test and test, test generally is to load by the preloading form at the scene, so a large amount of loads in kind of needs (tens tons even up to a hundred tons cement or reinforcing bar or other weights).
When using method one was tested, beam deadweight was larger, during traffic expense, effort, exist simultaneously to the beam injury may; When using method two is tested, need to provide very large load, and larger loading space is arranged.
Summary of the invention
The problems referred to above that exist for solving prior art, the invention provides a kind of prestressed concrete beam loading test stationary installation and method of testing, simple in structure, making and easy to use adopts this stationary installation can be to the beam injury, do not need a large amount of loads in kind, be convenient to test at the scene.
For reaching above-mentioned technical purpose, prestressed concrete beam loading test stationary installation proposed by the invention is achieved by the following technical solutions: a kind of prestressed concrete beam loading test stationary installation, comprise that two levels and flange plate are to putting the each other test beam of reaction frame, the two ends of two described test beams are respectively equipped with and surround its periphery, end fixed mount all around, described fixed mount comprises, lower, left, right four force bearing plates, the end connection of these four force bearing plates surrounds framed structure, the flange plate downside of two described test beams is positioned on the described lower force bearing plate, described left force bearing plate contacts with the bottom surface, web end of a described test beam wherein, and described right force bearing plate contacts with the bottom surface, web end of the described test beam of another root; Be provided with horizontal loading lifting jack between two described test beams.
Be provided with height adjuster between the web of two described test beams and the described lower force bearing plate.
Described height adjuster is the unitized construction of lifting jack or steel plate or lifting jack and steel plate.
When described height adjuster is lifting jack, be provided with backing plate between described height adjuster and the described lower force bearing plate.
The end of four force bearing plates in described upper and lower, left and right connects by the mode of bolted, and the end joint face of described upper and lower two force bearing plates is provided with a plurality of bolt connecting holes.
Be installed with upper junction plate on described left and right two force bearing plates and end described upper force bearing plate the joint face, be installed with lower connecting plate on described left and right two force bearing plates and end described lower force bearing plate the joint face, each bolt connecting hole place of corresponding described upper and lower two force bearing plates is provided with connecting hole on described upper junction plate and the described lower connecting plate.
The invention allows for a kind of prestressed concrete beam loading test method of testing, comprise the steps:
1) with two test beam hoisted in position, adjusts the test beam height and make its web in surface level;
2) with fixed mount at the both ends of two test beams installation in position, the flange plate downside of two test beams is placed on the lower force bearing plate, left force bearing plate contacts with the bottom surface, web end of a test beam wherein, and right force bearing plate contacts with the bottom surface, web end of another root test beam; The horizontal loading lifting jack of installation in position between two test beams;
3) will load two test beams of jack pair and load, and load applies step by step by classification, take the measuring point of test beam span centre side top as the control measuring point, survey immediately after every grade of loading and read strain value, calculate itself and the difference that loads the before measurement value of reading
S g , then survey every 2min and read once, calculate the difference △ of 2min front and back reading
S, and calculate relative reading difference:
m=△
S/S g , when relative reading error
mValue satisfies 0＜
m＜1%, think that structure is basicly stable, can carry out reading to observation station.
Be provided with height adjuster between the web of two described test beams and the described lower force bearing plate.
The end of four force bearing plates in described upper and lower, left and right connects by the mode of bolted, and the end joint face of described upper and lower two force bearing plates is provided with a plurality of bolt connecting holes.
Be installed with upper junction plate on described left and right two force bearing plates and end described upper force bearing plate the joint face, be installed with lower connecting plate on described left and right two force bearing plates and end described lower force bearing plate the joint face, each bolt connecting hole place of corresponding described upper and lower two force bearing plates is provided with connecting hole on described upper junction plate and the described lower connecting plate.
Compared with prior art, prestressed concrete beam loading test fixture structure of the present invention is simple, and making and easy to use when test prestressed concrete beam load-bearing capacity, can provide effective end anchorage, and can be to the beams of concrete injury; Adopt the loading test method of testing of this stationary installation not need a large amount of loads in kind, be convenient to test at the scene.
Description of drawings
Fig. 1 is the side view of embodiment of the invention prestressed concrete beam loading test stationary installation;
Fig. 2 be among Fig. 1 A-A to cut-open view.
Embodiment
For the purpose, technical scheme and the advantage that make the embodiment of the invention clearer, below in conjunction with the accompanying drawing in the embodiment of the invention, technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that obtains under the creative work prerequisite.
Shown in seeing figures.1.and.2, present embodiment prestressed concrete beam loading test stationary installation comprises two test beams 1, two test beam 1 horizontal positioned, and its flange plate 1-1 is to putting, make each other reaction frame of two test beams, the two ends of two test beams 1 are respectively equipped with and surround its periphery, end fixed mount all around, fixed mount comprises force bearing plate 2, lower force bearing plate 3, left force bearing plate 4 and right force bearing plate 5, the end connection of these four force bearing plates surrounds framed structure, upper force bearing plate 2 is positioned on the flange plate 1-1 upper side of two test beams 1, contact with the flange plate 1-1 upper side of two test beams 1, the flange plate 1-1 downside of two test beams 1 is positioned on the lower force bearing plate 3, lower force bearing plate 3 is contacted with the flange plate 1-1 downside of two test beams 1, left force bearing plate 4 contacts with the bottom surface of the web 1-2 of the test beam 1 that is positioned at the left side, and right force bearing plate 5 contacts with the bottom surface of the web 1-2 of the test beam 1 that is positioned at the right side; Need to be provided with horizontal loading lifting jack 6 according to loading between two test beams 1, load lifting jack 6 and be in stress state, its bottom and jacking end all are against on the flange plate 1-1 of test beam 1.
Firm for the loading that guarantee to load lifting jack 6, its below can be supported or its top is lifted with cushion block, make load lifting jack 6 the center just in time with test beam 1 Width on center superposition.In addition, different according to the concrete size of test beam 1, the number that loads lifting jack 6 can be for a plurality of.
Upper force bearing plate 2 in the present embodiment, lower force bearing plate 3, left force bearing plate 4 and right force bearing plate 5 are selected H shaped steel force bearing plate, have ribbed stiffener 12 on the force bearing plate with rigidity and the stability of reinforcement plate.
For the web 1-2 that fully guarantees two test beams 1 is in horizontality, prevent destruction that the beam self gravitation causes and warranty test result's accuracy, be provided with height adjuster between web 1-2 and the lower force bearing plate 3.Height adjuster is selected lifting jack 7 in the present embodiment, realizes the height control of web 1-2 by the jacking of lifting jack 7.Certainly, height adjuster also can be selected other versions, such as steel plate, needs the height of bed hedgehopping by calculating web 1-2, and the metal mat of selection suitable quantity and thickness is adjusted web 1-2 and is in horizontality below web 1-2; In addition, when required adjustment is highly larger, for avoiding lifting jack 7 jackings distance larger, affect its stability, height adjuster also can be selected the unitized construction of lifting jack 7 and steel plate, be about to steel plate place lifting jack 7 below, lifting jack 7 is raised certain distance.
When the preferred lifting jack 7 of height adjuster, and the flange plate width of lower force bearing plate 3 hour, for ease of placing lifting jack 7, be provided with backing plate 8 between lifting jack 7 and the lower force bearing plate 3, in support jack 7, can also increase the touch panel between lifting jack 7 and the lower force bearing plate 3, the lower force bearing plate 3 of assurance can not be subject to too large pressure and damage.
Four force bearing plates 2 in upper and lower, left and right, 3,4,5 end are connected by the mode of bolted, be provided with a plurality of bolt connecting holes 9 at its end joint face, can be according to the left and right force bearing plate 4 of the height control of test beam, 5 spacing, after adjusting to the right place, select corresponding bolt connecting hole 9 that each force bearing plate is fastenedly connected.
Because each force bearing plate of present embodiment is selected the H shape steel plate, left side for vertical placement, right force bearing plate 4,5, itself and upper, lower force bearing plate 2,3 end joint face is the H type, being not easy to carry out bolt connects, for ease of realizing that bolt connects, and can realize that many bolts hole adjustings are left, right force bearing plate 4,5 spacing, left, right two force bearing plates 4, be installed with upper junction plate 10 on 5 the end joint face, with be installed with lower connecting plate 11 on the end joint face of lower force bearing plate 3, on upper junction plate 10 and the lower connecting plate 11 on the correspondence, lower two force bearing plates 2, each bolt connecting hole place of 3 is provided with connecting hole 13.The setting of upper junction plate 10 and lower connecting plate 11 can be adopted the mode of welding in the present embodiment, certainly also can adopt other modes, does not do concrete restriction.
Present embodiment has also proposed a kind of prestressed concrete beam loading test method of testing, comprises the steps:
1) with two test beam hoisted in position, adjusts the test beam height and make its web in surface level;
2) with fixed mount at the both ends of two test beams installation in position, the flange plate downside of two test beams is placed on the lower force bearing plate, left force bearing plate contacts with the bottom surface, web end of a test beam wherein, and right force bearing plate contacts with the bottom surface, web end of another root test beam; The horizontal loading lifting jack of installation in position between two test beams;
3) will load two test beams of jack pair and load, and load applies step by step by classification, take the measuring point of test beam span centre side top as the control measuring point, survey immediately after every grade of loading and read strain value, calculate itself and the difference that loads the before measurement value of reading
S g , then survey every 2min and read once, calculate the difference △ of 2min front and back reading
S, and calculate relative reading difference:
m=△
S/S g , when relative reading error
mValue satisfies 0＜
m＜1%, think that structure is basicly stable, can carry out reading to observation station.
When carrying out deflection observation, load is no less than 30min stabilization time; Carry out crack resistance when observation, load is no less than 15min stabilization time.
For the web 1-2 that fully guarantees two test beams 1 is in horizontality, prevent destruction that the beam self gravitation causes and warranty test result's accuracy, be provided with height adjuster between web 1-2 and the lower force bearing plate 3.Height adjuster is selected lifting jack 7 in the present embodiment, realizes the height control of web 1-2 by the jacking of lifting jack 7.Certainly, height adjuster also can be selected other versions, such as steel plate, needs the height of bed hedgehopping by calculating web 1-2, and the metal mat of selection suitable quantity and thickness is adjusted web 1-2 and is in horizontality below web 1-2; In addition, when required adjustment is highly larger, for avoiding lifting jack 7 jackings distance larger, affect its stability, height adjuster also can be selected the unitized construction of lifting jack 7 and steel plate, be about to steel plate place lifting jack 7 below, lifting jack 7 is raised certain distance.
Four force bearing plates 2 in upper and lower, left and right, 3,4,5 end are connected by the mode of bolted, be provided with a plurality of bolt connecting holes 9 at its end joint face, can be according to the left and right force bearing plate 4 of the height control of test beam, 5 spacing, after adjusting to the right place, select corresponding bolt connecting hole 9 that each force bearing plate is fastenedly connected.
Because each force bearing plate of present embodiment is selected the H shape steel plate, left side for vertical placement, right force bearing plate 4,5, itself and upper, lower force bearing plate 2,3 end joint face is the H type, being not easy to carry out bolt connects, for ease of realizing that bolt connects, and can realize that many bolts hole adjustings are left, right force bearing plate 4,5 spacing, left, right two force bearing plates 4, be installed with upper junction plate 10 on 5 the end joint face, with be installed with lower connecting plate 11 on the end joint face of lower force bearing plate 3, on upper junction plate 10 and the lower connecting plate 11 on the correspondence, lower two force bearing plates 2, each bolt connecting hole place of 3 is provided with connecting hole 13.The setting of upper junction plate 10 and lower connecting plate 11 can be adopted the mode of welding in the present embodiment, certainly also can adopt other modes, does not do concrete restriction.
The above only is preferred embodiment of the present invention, is not to be the restriction of the present invention being made other form, and any those skilled in the art may utilize the technology contents of above-mentioned announcement to be changed or be modified as the equivalent embodiment of equivalent variations.But every technical solution of the present invention content that do not break away to any simple modification, equivalent variations and remodeling that above embodiment does, still belongs to the protection domain of technical solution of the present invention according to technical spirit of the present invention.
Claims (10)
1. prestressed concrete beam loading test stationary installation, comprise that two levels and flange plate are to putting the each other test beam of reaction frame, it is characterized in that: the two ends of two described test beams are respectively equipped with and surround its periphery, end fixed mount all around, described fixed mount comprises, lower, left, right four force bearing plates, the end connection of these four force bearing plates surrounds framed structure, the flange plate downside of two described test beams is positioned on the described lower force bearing plate, described left force bearing plate contacts with the bottom surface, web end of a described test beam wherein, and described right force bearing plate contacts with the bottom surface, web end of the described test beam of another root; Be provided with horizontal loading lifting jack between two described test beams.
2. prestressed concrete beam loading test stationary installation according to claim 1 is characterized in that: be provided with height adjuster between the web of two described test beams and the described lower force bearing plate.
3. prestressed concrete beam loading test stationary installation according to claim 2, it is characterized in that: described height adjuster is the unitized construction of lifting jack or steel plate or lifting jack and steel plate.
4. prestressed concrete beam loading test stationary installation according to claim 3 is characterized in that: when described height adjuster is lifting jack, be provided with backing plate between described height adjuster and the described lower force bearing plate.
5. prestressed concrete beam loading test stationary installation according to claim 1, it is characterized in that: the end of four force bearing plates in described upper and lower, left and right connects by the mode of bolted, and the end joint face of described upper and lower two force bearing plates is provided with a plurality of bolt connecting holes.
6. prestressed concrete beam loading test stationary installation according to claim 5, it is characterized in that: be installed with upper junction plate on described left and right two force bearing plates and end described upper force bearing plate the joint face, be installed with lower connecting plate on described left and right two force bearing plates and end described lower force bearing plate the joint face, each bolt connecting hole place of corresponding described upper and lower two force bearing plates is provided with connecting hole on described upper junction plate and the described lower connecting plate.
7. the prestressed concrete beam loading test method of testing based on the described stationary installation of claim 1 to 6 is characterized in that comprising the steps:
1) with two test beam hoisted in position, adjusts the test beam height and make its web in surface level;
2) with fixed mount at the both ends of two test beams installation in position, the flange plate downside of two test beams is placed on the lower force bearing plate, left force bearing plate contacts with the bottom surface, web end of a test beam wherein, and right force bearing plate contacts with the bottom surface, web end of another root test beam; The horizontal loading lifting jack of installation in position between two test beams;
3) will load two test beams of jack pair and load, and load applies step by step by classification, take the measuring point of test beam span centre side top as the control measuring point, survey immediately after every grade of loading and read strain value, calculate itself and the difference that loads the before measurement value of reading
S g , then survey every 2min and read once, calculate the difference △ of 2min front and back reading
S, and calculate relative reading difference:
m=△
S/S g , when relative reading error m value satisfies 0＜m＜1%, think that structure is basicly stable, can carry out reading to the control measuring point.
8. prestressed concrete beam loading test method of testing according to claim 7 is characterized in that: be provided with height adjuster between the web of two described test beams and the described lower force bearing plate.
9. prestressed concrete beam loading test method of testing according to claim 7, it is characterized in that: the end of four force bearing plates in described upper and lower, left and right connects by the mode of bolted, and the end joint face of described upper and lower two force bearing plates is provided with a plurality of bolt connecting holes.
10. prestressed concrete beam loading test method of testing according to claim 9, it is characterized in that: be installed with upper junction plate on described left and right two force bearing plates and end described upper force bearing plate the joint face, be installed with lower connecting plate on described left and right two force bearing plates and end described lower force bearing plate the joint face, each bolt connecting hole place of corresponding described upper and lower two force bearing plates is provided with connecting hole on described upper junction plate and the described lower connecting plate.
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| CN201210500040.3A CN102998168B (en) | 2012-11-30 | 2012-11-30 | Fixing device for load test of pre-stressed concrete beam and testing method |
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| CN201210500040.3A CN102998168B (en) | 2012-11-30 | 2012-11-30 | Fixing device for load test of pre-stressed concrete beam and testing method |
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| CN102998168B CN102998168B (en) | 2014-11-05 |
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| CN104198587A (en) * | 2014-08-12 | 2014-12-10 | 宁波大学 | Method for measuring damage evolution of concrete material under action of static load |
| CN104330276A (en) * | 2014-11-11 | 2015-02-04 | 青岛建安建设集团有限公司 | Test method for measuring ultimate bearing capacity of ceiling support system |
| CN104596836A (en) * | 2014-11-28 | 2015-05-06 | 浙江工业大学 | Tubular product fretting fatigue test bridge transverse fretting loading device |
| CN104849034A (en) * | 2015-05-21 | 2015-08-19 | 江西省水利科学研究院 | U-shaped groove internal and external compressive strength detection device |
| CN104931338A (en) * | 2015-06-04 | 2015-09-23 | 廊坊市阳光建设工程质量检测有限公司 | Angle-free rebound testing concrete test block fixing device, and manufacturing method and use method thereof |
| CN108151939A (en) * | 2017-12-26 | 2018-06-12 | 中冶建筑研究总院有限公司 | The method of test existing structure prestress value based on deformation and tensile relationship curve |
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