CN111766150A - Loading counterforce device used for high-speed rail box girder static load test - Google Patents
Loading counterforce device used for high-speed rail box girder static load test Download PDFInfo
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- CN111766150A CN111766150A CN202010746855.4A CN202010746855A CN111766150A CN 111766150 A CN111766150 A CN 111766150A CN 202010746855 A CN202010746855 A CN 202010746855A CN 111766150 A CN111766150 A CN 111766150A
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- 229910000831 Steel Inorganic materials 0.000 claims description 13
- 239000010959 steel Substances 0.000 claims description 13
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- 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 abstract description 8
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- 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
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Abstract
The invention relates to a test device, in particular to a loading counter-force device used for a high-speed rail box girder static load test, which comprises a test pedestal, wherein a test beam is placed on the upper side of the test pedestal, a jack is arranged on the upper side of the test beam, a counter-force crossbeam is transversely arranged on the upper side of the jack, a load sensor is arranged between the jack and the counter-force crossbeam, a first anchor pile and a second anchor pile are respectively arranged on the ground on two sides of the test pedestal, a first counter-force anchor bar is vertically arranged at the upper end of the first anchor pile, the upper end of the first counter-force anchor bar is connected with one side of the counter-force crossbeam, a second counter-force anchor bar is vertically arranged at the upper end of the second anchor pile, and the upper end of the. The problems that a truss type reaction frame with the same length as a box girder needs to be used for providing counter force in the static load test of the existing high-speed railway box girder, and the truss type reaction frame is large in size, so that transportation difficulty, complex assembly and disassembly and high manufacturing cost can be caused are solved.
Description
Technical Field
The invention relates to a test device, in particular to a loading counterforce device used in a high-speed rail box girder static load test.
Background
In the construction of a high-speed railway, the occupation ratio of a bridge which is linear and needs land saving is large, most of the bridge needs to be a standard box girder, a girder yard needs to be built to complete the prefabrication of the box girder, the quality of the prefabricated box girder needs to be authenticated and evaluated through a static load test before the box girder leaves the yard, the static load test of the high-speed railway box girder mostly adopts 5-point equivalent concentrated load loading, concentrated force is applied by a large-tonnage jack, the jack needs a truss type reaction frame which is as long as the box girder to provide reaction force, the steel truss type reaction frame has large volume, is difficult to transport, is complex to assemble and disassemble, and is high in manufacturing cost, so that a loading reaction device used in the static load test of the high-speed railway box girder is needed to solve the technical problem.
Disclosure of Invention
The invention aims to provide a loading counterforce device used for a high-speed rail box girder static load test, which solves the problems that a truss type counterforce frame with the same length as a box girder needs to be used for providing counterforce in the existing high-speed rail box girder static load test, and the truss type counterforce frame is large in size, so that the transportation is difficult, the assembly and disassembly are complicated, and the manufacturing cost is high.
In order to solve the technical problems, the invention adopts the following technical scheme:
a loading counterforce device used for a high-speed rail box girder static load test comprises a test pedestal, a test girder is placed on the upper side of the test pedestal, a jack is arranged on the upper side of the test girder, a counterforce cross beam is transversely arranged on the upper side of the jack, and a load sensor is arranged between the jack and the counterforce cross beam;
a first anchor pile and a second anchor pile are respectively arranged on the ground at the two sides of the test pedestal;
a first counter-force anchor bar is vertically arranged at the upper end of the first anchor pile, and the upper end of the first counter-force anchor bar is connected with one side of the counter-force cross beam;
and a second counter-force anchor bar is vertically arranged at the upper end of the second anchor pile, and the upper end of the second counter-force anchor bar is connected with the other side of the counter-force cross beam.
The further technical scheme is that embedded anchor bars are arranged in the first anchor pile and the second anchor pile, anchor bar connectors are arranged at the upper ends of the embedded anchor bars, and the anchor bar connectors are connected with the first counter-force anchor bars or the second counter-force anchor bars.
The further technical scheme is that the bottom of the embedded anchor bar is connected with the first anchor pile or the second anchor pile through a pressure dispersion anchor plate, an interval of 0.5m is reserved between the bottom of the embedded anchor bar and the bottom of the first anchor pile or the bottom of the second anchor pile, the top of the embedded anchor bar penetrates out of the first anchor pile or the second anchor pile and is reserved with a connecting section of 0.5m, and the embedded anchor bar is connected with the anchor bar connector through the connecting section.
The technical scheme is that when the width of a wing plate of the test beam is smaller than 2m, the first counter-force anchor rib and the second counter-force anchor rib penetrate through the outer side of the wing plate and are connected with a counter-force cross beam above the wing plate.
According to a further technical scheme, when the width of the wing plate of the test beam is more than 2m, a first anchor bar through hole and a second anchor bar through hole are respectively formed in the wing plates on two sides of the test beam, the upper end of the first counter-force anchor bar penetrates through the first anchor bar through hole and is connected with one side of the counter-force cross beam, and the upper end of the second counter-force anchor bar penetrates through the second anchor bar through hole and is connected with the other side of the counter-force cross beam.
According to a further technical scheme, after the test is finished, the first anchor bar through hole and the second anchor bar through hole are plugged through post-embedded steel bars and post-poured micro-expansion concrete.
According to a further technical scheme, anchors are arranged on two sides of the counter-force beam, and the upper ends of the first counter-force anchor bar and the second counter-force anchor bar are anchored with the upper top surface of the counter-force beam through the anchors on the two sides.
According to a further technical scheme, the uplift bearing capacity of the first anchor pile and the second anchor pile is not less than 1.2 times of the single-point test load.
The further technical scheme is that the number of the first anchor piles and the number of the second anchor piles are 5, the first anchor piles and the second anchor piles are respectively arranged on the mid-span section and two sides of the test beam at a distance of +4m, +8m, -4m and-8 m from the mid-span section, and the first counter-force anchor bars and the second counter-force anchor bars are matched with the first anchor piles and the second anchor piles.
The technical scheme is that the test beam is provided with two jacks on the upper side of each section, the two jacks are symmetrically arranged along the vertical central axis of the test beam, and the load sensors are matched with the jacks.
Compared with the prior art, the invention has the beneficial effects that: box girder static load test is carried out on the test bench seat, place the test roof beam on the test bench seat, carry out the loading through the jack, because the counter-force crossbeam is fixed on first anchor pile and second anchor pile through first counter-force anchor bar and second counter-force anchor bar, the loading force of jack just can form static load test to the test roof beam of downside, thereby test the performance of test roof beam, utilize first anchor pile of counter-force crossbeam cooperation, first counter-force anchor bar, second anchor pile and second counter-force anchor bar replace steel truss-like reaction frame, not only the transportation is convenient, it is convenient to install and remove, it is good to have mechanical properties simultaneously, the lower advantage of input cost.
Drawings
Fig. 1 is a cross-sectional layout view of a loading reaction device used in a static load test of a high-speed railway box girder according to the present invention.
Fig. 2 is a vertical layout view of a loading reaction device used in a static load test of a high-speed rail box beam according to the present invention.
Icon: 101-first anchor pile, 102-second anchor pile, 2-embedded anchor bar, 3-anchor bar connector, 401-first counter-force anchor bar, 402-second counter-force anchor bar, 5-anchor, 601-first anchor bar perforation, 602-second anchor bar perforation, 7-counter-force beam, 8-jack, 9-load sensor, 10-test beam, 11-test pedestal.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example (b):
fig. 1-2 show a preferred embodiment of the loading reaction device used in the static load test of the high-speed railway box girder of the present invention, the loading reaction device used in the static load test of the high-speed railway box girder in this embodiment specifically includes a test bed 11, a test beam 10 is placed on the upper side of the test bed 11, a jack 8 is disposed on the upper side of the test beam 10, a reaction beam 7 is transversely disposed on the upper side of the jack 8, a load sensor 9 is disposed between the jack 8 and the reaction beam 7, a first anchor pile 101 and a second anchor pile 102 are respectively disposed on the ground on both sides of the test bed 11, a first reaction anchor bar 401 is vertically disposed at the upper end of the first anchor pile 101, the upper end of the first reaction anchor bar 401 is connected to one side of the reaction beam 7, a second reaction anchor bar 402 is vertically disposed at the upper end of the second anchor pile 102, and the upper end of the second anchor bar 402 is connected to the other side.
Box girder static load test is carried out on test bed 11, place test beam 10 on test bed 11, carry out the loading through jack 8, because reaction beam 7 is fixed on first anchor pile 101 and second anchor pile 102 through first reaction anchor bar 401 and second reaction anchor bar 402, the loading force of jack 8 just can form the static load test to test beam 10 of downside, thereby test the performance of test beam 10, utilize reaction beam 7 to cooperate first anchor pile 101, first reaction anchor bar 401, second anchor pile 102 and second reaction anchor bar 402 to replace steel truss-like reaction frame, not only the transportation is convenient, it is convenient to install and remove, it is good to have mechanical properties simultaneously, the input cost is lower advantage.
The reaction cross beam 7 is made by welding steel plates, the height, width, thickness and the like of the cross section of the reaction cross beam are calculated and determined according to the distance of a transverse anchor point, the distance of a bearing point of the jack 8 and test load, and the reaction cross beam 7 has enough strength and rigidity to meet test requirements.
All be equipped with pre-buried dowel 2 in first anchor pile 101 and the second anchor pile 102, the upper end of pre-buried dowel 2 is equipped with dowel connector 3, and dowel connector 3 links to each other with first counter-force dowel 401 or second counter-force dowel 402. The bottom of the embedded anchor bar 2 is connected with the first anchor pile 101 or the second anchor pile 102 through the pressure dispersion anchor plate, an interval of 0.5m is reserved between the bottom of the embedded anchor bar 2 and the bottom of the first anchor pile 101 or the bottom of the second anchor pile 102, the top of the embedded anchor bar 2 penetrates out of the first anchor pile 101 or the second anchor pile 102 and is reserved with a connecting section of 0.5m, and the embedded anchor bar 2 is connected with the anchor bar connector 3 through the connecting section.
The embedded anchor bars 2 are embedded before concrete pouring, and the embedded anchor bars 2 are positioned through the positioning support during installation so as to ensure that the vertical state and the horizontal coordinate of the anchor bars are accurate and the positioning support is withdrawn after concrete curing. The embedded anchor bars 2 are finish-rolled threaded steel bars with the diameter of 25mm, 28mm or 32mm, and the specific numerical value is calculated according to the magnitude of the loading force. The materials and the types of the first counter-force anchor bars 401 and the second counter-force anchor bars 402 are the same as those of the embedded anchor bars 2, and after the test beam 10 is in place, when the test preparation works, the embedded anchor bars 2 and the first counter-force anchor bars 401 can be connected through the anchor bar connectors 3, and the embedded anchor bars 2 and the second counter-force anchor bars 402 can be connected.
When the width of the test beam 10 wing plate is less than 2m, the first reaction anchor 401 and the second reaction anchor 402 pass through the outer side of the wing plate and are connected to the reaction beam 7 above. When the width of the wing plate of the test beam 10 is more than 2m, the wing plates on the two sides of the test beam 10 are respectively provided with a first anchor bar perforation 601 and a second anchor bar perforation 602, the upper end of the first counter-force anchor bar 401 penetrates through the first anchor bar perforation 601 and is connected with one side of the counter-force beam 7, and the upper end of the second counter-force anchor bar 402 penetrates through the second anchor bar perforation 602 and is connected with the other side of the counter-force beam 7. The first anchor bar through hole 601 and the second anchor bar through hole 602 are both round holes with the aperture of 100-. After the test is finished, the first anchor bar through hole 601 and the second anchor bar through hole 602 are plugged by post-planting bars and post-pouring micro-expansion concrete.
Both sides of the reaction beam 7 are provided with anchors 5, and the upper ends of the first reaction anchor bar 401 and the second reaction anchor bar 402 are anchored with the upper top surface of the reaction beam 7 through the anchors 5 on both sides. The reaction beam 7 may also be provided with a prepared hole, and the first reaction anchor bar 401 and the second reaction anchor bar 402 are respectively arranged in the prepared hole on both sides of the reaction beam 7, and then fixed by the anchorage device 5, so as to realize stable connection between the first reaction anchor bar 401 and the second reaction anchor bar 402 and the reaction beam 7. The number of the preformed holes on the counter-force beam 7 is matched with the diameter and the number of the first counter-force anchor bars 401 and the second counter-force anchor bars 402, and the positions of the preformed holes are corresponding to the positions of the preformed holes.
According to the factors such as the diameter, the pile length, the loading force and the geological conditions of the first anchor pile 101 and the second anchor pile 102, the uplift bearing capacity of the first anchor pile 101 and the second anchor pile 102 is not less than 1.2 times of the load of a single-point test, and therefore smooth completion of a static load test is guaranteed.
The number of the first anchor piles 101 and the number of the second anchor piles 102 are 5, the first anchor piles 101 and the second anchor piles 102 are respectively arranged on the midspan section of the test beam 10 and on two sides of the test beam at a distance of +4m, +8m, -4m and-8 m from the midspan section, and the first counter-force anchor bars 401 and the second counter-force anchor bars 402 are matched with the first anchor piles 101 and the second anchor piles 102.
Before the construction of a precast yard of a high-speed railway box girder, a corresponding test site is planned to build a test pedestal 11, then a first anchor pile 101 and a second anchor pile 102 are arranged, the first anchor pile 101 and the second anchor pile 102 are respectively arranged at 5 cross-section positions, 5 cross-sections are respectively a cross-section 8m far away from the middle left side of a test beam 10 span, a cross-section 4m far away from the middle left side of the test beam 10 span, a cross-section in the middle of the test beam 10 span, a cross-section 4m far away from the middle right side of the test beam 10 span and a cross-section 8m far away from the middle right side of the test beam 10 span, so that 5 first anchor piles 101 and 5 second anchor piles 102 are arranged in 5 rows and transversely arranged below a flange plate, and are also symmetrically arranged along the central axis of the length direction of the test beam 10.
The test beam 10 is provided with two jacks 8 on the upper side of each section, the two jacks 8 are symmetrically arranged along the vertical central axis of the test beam 10, and the load sensor 9 is matched with the jacks 8. The jack 8 is the loading device of this static test, and the size of loading power is measured by load sensor 9 at the top of jack 8, and 2 jacks 8 of every loading cross-section transversal arrangement, 2 jacks 8 transversal symmetry place directly over the web.
Although the invention has been described herein with reference to a number of illustrative embodiments thereof, it should be understood that numerous other modifications and embodiments can be devised by those skilled in the art that will fall within the spirit and scope of the principles of this disclosure. More specifically, various variations and modifications are possible in the component parts and/or arrangements of the subject combination arrangement within the scope of the disclosure, the drawings and the appended claims. In addition to variations and modifications in the component parts and/or arrangements, other uses will also be apparent to those skilled in the art.
Claims (10)
1. The utility model provides a loading counterforce device that high-speed railway case roof beam static test used which characterized in that: the test bed comprises a test bed seat (11), a test beam (10) is placed on the upper side of the test bed seat (11), a jack (8) is arranged on the upper side of the test beam (10), a reaction beam (7) is transversely arranged on the upper side of the jack (8), and a load sensor (9) is arranged between the jack (8) and the reaction beam (7);
a first anchor pile (101) and a second anchor pile (102) are respectively arranged on the ground at the two sides of the test bed (11);
a first counter-force anchor bar (401) is vertically arranged at the upper end of the first anchor pile (101), and the upper end of the first counter-force anchor bar (401) is connected with one side of the counter-force cross beam (7);
and a second counter-force anchor bar (402) is vertically arranged at the upper end of the second anchor pile (102), and the upper end of the second counter-force anchor bar (402) is connected with the other side of the counter-force beam (7).
2. The loading counterforce device used in the high-speed rail box girder static load test according to claim 1, characterized in that: all be equipped with pre-buried dowel steel (2) in first anchor pile (101) and second anchor pile (102), the upper end of pre-buried dowel steel (2) is equipped with dowel steel connector (3), dowel steel connector (3) link to each other with first counter-force dowel steel (401) or second counter-force dowel steel (402).
3. The loading counterforce device used in the static load test of the high-speed rail box girder according to claim 2, is characterized in that: the bottom of pre-buried anchor bar (2) links to each other with first anchor pile (101) or second anchor pile (102) through pressure dispersion anchor slab, leave between the bottom of pre-buried anchor bar (2) and first anchor pile (101) or second anchor pile (102) bottom and be equipped with 0.5 m's interval, first anchor pile (101) or second anchor pile (102) are worn out and 0.5 m's linkage segment is left at the top of pre-buried anchor bar (2), and pre-buried anchor bar (2) link to each other with anchor bar connector (3) through the linkage segment.
4. The loading counterforce device used in the high-speed rail box girder static load test according to claim 1, characterized in that: when the width of the wing plate of the test beam (10) is less than 2m, the first counter force anchor bar (401) and the second counter force anchor bar (402) penetrate through the outer side of the wing plate and are connected with the counter force beam (7) above.
5. The loading counterforce device used in the high-speed rail box girder static load test according to claim 1, characterized in that: when the width of a wing plate of the test beam (10) is more than 2m, a first anchor bar perforation (601) and a second anchor bar perforation (602) are respectively arranged on the wing plates on two sides of the test beam (10), the upper end of the first counter-force anchor bar (401) penetrates through the first anchor bar perforation (601) and is connected with one side of the counter-force cross beam (7), and the upper end of the second counter-force anchor bar (402) penetrates through the second anchor bar perforation (602) and is connected with the other side of the counter-force cross beam (7).
6. The loading counterforce device used in the static load test of the high-speed rail box girder according to claim 5, is characterized in that: after the test is finished, the first anchor bar through hole (601) and the second anchor bar through hole (602) are plugged by post-embedded steel bars and post-poured micro-expansion concrete.
7. The loading counterforce device used in the high-speed rail box girder static load test according to claim 1, characterized in that: and anchorage devices (5) are arranged on two sides of the reaction cross beam (7), and the upper ends of the first reaction anchor bar (401) and the second reaction anchor bar (402) are anchored with the upper top surface of the reaction cross beam (7) through the anchorage devices (5) on the two sides.
8. The loading counterforce device used in the high-speed rail box girder static load test according to claim 1, characterized in that: the uplift bearing capacity of the first anchor pile (101) and the second anchor pile (102) is not less than 1.2 times of the single-point test load.
9. The loading counterforce device used in the high-speed rail box girder static load test according to claim 1, characterized in that: the number of the first anchor piles (101) and the number of the second anchor piles (102) are 5, the first anchor piles and the second anchor piles are respectively arranged on the midspan section of the test beam (10) and on two sides of the test beam at a distance of +4m, +8m, -4m and-8 m from the midspan section, and the first counter-force anchor bars (401) and the second counter-force anchor bars (402) are matched with the first anchor piles (101) and the second anchor piles (102).
10. The loading counterforce device for the static load test of the high-speed rail box girder according to claim 9, is characterized in that: the test beam (10) is provided with two jacks (8) on the upper side of each section, the two jacks (8) are symmetrically arranged along the vertical central axis of the test beam (10), and the load sensors (9) are matched with the jacks (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010746855.4A CN111766150A (en) | 2020-07-29 | 2020-07-29 | Loading counterforce device used for high-speed rail box girder static load test |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010746855.4A CN111766150A (en) | 2020-07-29 | 2020-07-29 | Loading counterforce device used for high-speed rail box girder static load test |
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| CN111766150A true CN111766150A (en) | 2020-10-13 |
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| CN202010746855.4A Pending CN111766150A (en) | 2020-07-29 | 2020-07-29 | Loading counterforce device used for high-speed rail box girder static load test |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114295483A (en) * | 2021-12-29 | 2022-04-08 | 常熟市工程质量检测中心 | Loading device and loading method for structure performance test of prefabricated laminated slab |
| CN115450270A (en) * | 2022-10-26 | 2022-12-09 | 上海公路桥梁（集团）有限公司 | Loading method for prestress box girder bearing capacity failure test |
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| JP2011017227A (en) * | 2009-07-10 | 2011-01-27 | Takenaka Komuten Co Ltd | Loading test apparatus and loading test method |
| CN204139209U (en) * | 2014-08-20 | 2015-02-04 | 孙传印 | Static loading test counterforce device |
| CN206095814U (en) * | 2016-10-21 | 2017-04-12 | 山西省交通科学研究院 | Monospar static test loading system |
| CN206648827U (en) * | 2017-05-02 | 2017-11-17 | 中铁四局集团第四工程有限公司 | A kind of adjustable static test reaction frame of prefabricated case beam |
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2020
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| CN201122142Y (en) * | 2007-12-13 | 2008-09-24 | 中铁二局股份有限公司 | 32m/900t prestressed concrete pretensioned box beam static load testing bench seat |
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| CN204139209U (en) * | 2014-08-20 | 2015-02-04 | 孙传印 | Static loading test counterforce device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114295483A (en) * | 2021-12-29 | 2022-04-08 | 常熟市工程质量检测中心 | Loading device and loading method for structure performance test of prefabricated laminated slab |
| CN115450270A (en) * | 2022-10-26 | 2022-12-09 | 上海公路桥梁（集团）有限公司 | Loading method for prestress box girder bearing capacity failure test |
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Application publication date: 20201013 |