CN111982375B - Test device for friction resistance and strand retraction amount of anchor mouth - Google Patents
Test device for friction resistance and strand retraction amount of anchor mouth Download PDFInfo
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- CN111982375B CN111982375B CN202010848322.7A CN202010848322A CN111982375B CN 111982375 B CN111982375 B CN 111982375B CN 202010848322 A CN202010848322 A CN 202010848322A CN 111982375 B CN111982375 B CN 111982375B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
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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
- G01N3/04—Chucks
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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
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0017—Tensile
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
A test device for the friction resistance of an anchor port and the retraction amount of a stranded wire belongs to the technical field of prestress test devices. The invention can eliminate weather interference and carry out indoor test, thereby improving the efficiency; the device is firmer; avoiding the loss of force value; the anchor backing plate examination mould can adapt to the anchor backing plate of various models, uses in a flexible way. Including girder steel, anchor backing plate test piece, sensor, jack, steel strand wires, its characterized in that: the steel beam is at least two, supporting blocks are arranged at two ends of each steel beam together, a cylindrical through hole is formed in the center of each supporting block, the outer side of each supporting block is detachably connected with an anchor backing plate test piece, the outer side of each anchor backing plate test piece is connected with a sensor in a matched mode, the outer side of each sensor is connected with a jack, the outer side of each jack is connected with a tool anchor, and the steel strand penetrates through the tool anchor, the jack, the sensors, the anchor backing plate test pieces, the supporting blocks and the steel beams respectively.
Description
Technical Field
The invention belongs to the technical field of prestress test devices, and particularly relates to a test device for the friction resistance of an anchor port and the retraction amount of a stranded wire.
Background
Modern railways are rapidly developed, high-speed railways become common traffic for people to go out, the requirements of the high-speed railways on bridges are continuously improved, and prestressed concrete beams are also frequently applied to high-speed rails. The anchor mouth friction resistance test also begins to be common gradually, and the test piece result has very big influence to the tensile force value of prestressing tendons, can influence the quality of prestressed concrete roof beam even. But the experimental testing arrangement at present all uses concrete placement roof beam as the main part usually, makes the trabecula test piece at every building site scene usually, and the time of having wasted needs on-the-spot maintenance intensity moreover, and the problem that the beam body intensity is not satisfied also can appear in the trabecula test piece simultaneously. The current test environment is only outdoors, and the accuracy of the test is influenced because outdoor weather, particularly wind and rain, greatly influences the test. Therefore, the existing prestressed pipeline anchor port friction resistance and stranded wire retraction amount testing device can be replaced, weather interference can be eliminated, indoor testing can be carried out, a trabecular test piece can be avoided being manufactured, the requirement on strength of a beam body is met, the device is flexible to use, and the efficiency of the testing device for the anchor port friction resistance and the stranded wire retraction amount is higher.
Disclosure of Invention
Aiming at the problems, the invention provides the test device which can be used for indoor test, can avoid manufacturing a trabecular test piece, meets the strength requirement of a beam body, is flexible to use and has higher efficiency in anchor port friction and stranded wire retraction.
In order to achieve the above purpose, the invention adopts the following technical scheme, and provides a test device for the friction resistance of an anchor port and the retraction amount of a stranded wire, which comprises a steel beam, an anchor backing plate test piece, a sensor, a jack and a steel stranded wire, and is characterized in that: the steel beam comprises at least two steel beams, supporting blocks are arranged at two ends of each steel beam together, a cylindrical through hole is formed in the center of each supporting block, the outer side of each supporting block can be detachably connected with an anchor backing plate test piece, the outer side of each anchor backing plate test piece is connected with a sensor in a matched mode, the outer side of each sensor is connected with a jack, the outer side of each jack is connected with a tool anchor, and the steel stranded wires penetrate through the tool anchor, the jacks, the sensors, the anchor backing plate test pieces, the supporting blocks and the steel beams respectively;
the lifting type lifting device is characterized by also comprising a supporting platform, wherein the supporting platform is arranged below the jack and the sensor in a lifting manner and supports the jack and the sensor, and a moving wheel is arranged at the bottom end of the supporting platform;
the anchor backing plate test piece comprises an anchor backing plate body and a fixing body, wherein the fixing body wraps the anchor backing plate body and is detachably connected with the supporting block;
the anchor backing plate test mould comprises four test mould plates, the test mould plates are connected in pairs in sequence to form a hollow cubic structure, a spiral rib is fixedly arranged at the center of the anchor backing plate test mould, the anchor backing plate test mould fixes the anchor backing plate body and the fixing body, and the fixing body is made of quick-drying mortar.
Preferably, a working anchor is arranged between the anchor backing plate test piece on one side of the test active end and the sensor, and a limiting plate is arranged between the working anchor and the sensor.
Preferably, the supporting platform is provided with two U-shaped grooves, and the jack and the sensor are clamped in the U-shaped grooves.
Preferably, the anchor backing plate body is of a horn-shaped cylinder type, and a wide-mouth end of the anchor backing plate body is connected with the sensor.
The invention has the beneficial effects.
The invention replaces outdoor precast concrete trabecula test piece, can eliminate weather interference and carry out test indoors, does not need to manufacture the trabecula test piece on site, saves test time and improves efficiency; the device is firmer, and the problem that the strength of a beam body of a field trabecular test piece is not met is solved; the supporting platform can well fix the jack and the sensor, so that instability of field chain inversion is avoided, the supporting platform adopts a lifting structure, and a steel strand can be well inserted in a butt joint manner, so that the sensor and the jack can be well centered, and the damage to equipment caused by the deviation of an instrument from the center in a loading process is prevented; the steel strand cannot rub with the pipeline when penetrating through the main body, so that the loss of force values is avoided; the anchor backing plate examination mould can adapt to the anchor backing plate of various models, uses in a flexible way.
Drawings
In order to make the technical problems, technical solutions and advantageous effects solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and the detailed description. It should be understood that the detailed description and specific examples, while indicating the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.
Fig. 1 is a schematic view of the present invention after installation.
Figure 2 is a schematic view of a test body formed of steel beams and support blocks of the present invention.
Fig. 3 is a side view of the anchor pad after the anchor pad is fixed by the anchor pad trial mold of the present invention.
FIG. 4 is another side view of the anchor pad of the present invention after it has been secured by the anchor pad trial.
In the attached drawing, 1 is a steel beam, 2 is an anchor backing plate test piece, 3 is a sensor, 4 is a jack, 5 is a steel strand, 6 is a supporting block, 7 is a through hole, 8 is a tool anchor, 9 is a working anchor, 10 is a limiting plate, 11 is a supporting platform, 12 is a U-shaped groove, 13 is an anchor backing plate body, 14 is a fixing body, 15 is an anchor backing plate test mold, 16 is a test mold plate, 17 is a spiral rib, 18 is a working clamping piece, 19 is a restraining ring, 20 is a protective net, and 21 is a movable wheel.
Detailed Description
The test device for the friction resistance of the anchor mouth and the retraction amount of the stranded wire comprises four steel beams 1, anchor backing plate test pieces 2, sensors 3, jacks 4 and steel stranded wires 5, wherein the four steel beams 1 can more firmly and comprehensively support the whole device and have higher strength than the existing concrete structure so as to prevent the device from being damaged in the test process, two support blocks 6 are jointly arranged at two ends of each steel beam 1, a cylindrical through hole 7 is formed in the center of each support block 6 and is used for penetrating through the steel stranded wire 5, the anchor backing plate test pieces 2 can be detachably connected to the outer sides of the two support blocks 6, the anchor backing plates 2 are detachable, so that the test device can adapt to different test conditions by replacing the anchor backing plate test pieces 2 instead of a structure that the concrete and the anchor backing plate test pieces 2 are fixedly embedded like the existing test device, only one size condition can be tested, and the sensor 3 is connected to the outer side of each anchor backing plate test piece 2, the outside of every sensor 3 all is connected with jack 4, and the outside of every jack 4 all is connected with instrument anchor 8, and the effect of sensor 3, jack 4, instrument anchor 8 is the same with current testing arrangement's effect, and tool anchor 8, jack 4, sensor 3, anchor backing plate test piece 2, supporting shoe 6 and girder steel 1 are run through respectively to steel strand wires 5.
A working anchor 9 is arranged between the anchor backing plate test piece 2 on one side of the testing active end and the sensor 3, and a limiting plate 10 is arranged between the working anchor 9 and the sensor 3.
Still be provided with supporting platform 11, the liftable formula sets up in jack 4 and sensor 3 below and supports jack 4 and sensor 3, fixed jack 4 and sensor 3 that can be fine, it is unstable to have avoided the on-the-spot chain fall of adopting, adopt elevation structure, the butt joint that carries on that can be fine penetrates steel strand wires 5, make the centering that sensor 3 and jack 4 can be fine, prevent that the skew center of instrument from damaging equipment in the loading process, supporting platform 11 bottom is provided with removes wheel 21, can remove supporting platform 11 more conveniently.
Two U-shaped grooves 12 are arranged on the supporting platform 11 for adapting to the installation structures of the jack 4 and the sensor 3, and the jack 4 and the sensor 3 are clamped in the U-shaped grooves 12.
The anchor backing plate test piece 2 comprises an anchor backing plate body 13 and a fixing body 14, wherein the fixing body 14 wraps the anchor backing plate body 13 and is detachably connected with the supporting block 6.
The experimental apparatus is still including the anchor backing plate examination mould 15 of arranging mutually, anchor backing plate examination mould 15 includes four examination templates 16, examination template 16 two liang of connections in proper order form hollow cube structure, remove examination template 16 after conveniently pouring, anchor backing plate examination mould 15 center is fixed and is provided with spiral muscle 17, anchor backing plate examination mould 15 is used for fixed anchor backing plate body 13 and fixed body 14, anchor backing plate examination mould 15 can adapt to the anchor backing plate of various models, adopt high strength rapid-curing cutback cement mortar, can be very fast experimental.
The anchor backing plate body 13 is of a horn-shaped cylinder shape, and the wide-mouth end of the anchor backing plate body 13 is connected with the sensor 3.
And (5) testing operation steps.
1. Preparing two anchor backing plate test molds 15, wherein the anchor backing plate test molds 15 are made of steel test molds 16, every two test molds 16 are sequentially connected by bolts, firstly, a release agent is uniformly smeared in the anchor backing plate test molds 15, then, spiral ribs 17 are fixed at the center, the anchor backing plate is placed in the spiral ribs 17, the edges of the anchor backing plate are just lapped on the spiral ribs 17, the anchor backing plate and the spiral ribs 17 are bound by binding wires, quick-drying mortar is injected into the anchor backing plate test molds 15, when the cement strength reaches 100 percent requirement, the bolts in the anchor backing plate test molds 15 are loosened, and the test molds 16 are detached.
2. The small-mouth end of the anchor backing plate test piece 2 is aligned to the through hole 7 of the supporting block 6, the wide-mouth end is outward, the size of the anchor backing plate test piece 2 is just matched with a main body formed by combining the supporting block 6 and the steel beam 1, and the test can be prepared after the butt joint is completed.
3. Penetrating the steel strand 5 from the supporting block 6 at one end to the supporting block 6 at the other end, wherein the steel strand 5 is aligned; a working anchor 9 is installed at the active end of the test, the steel strand 5 needs to be well aligned by the working anchor 9, and the steel strand is penetrated in, tightly penetrated through a working clamping piece 18 and then penetrated through a limiting plate 10; and a restraint ring 19 is arranged in the anchor backing plate at the test passive end, and a circle of protective net 20 is fixed on the supporting block 6 around the outer periphery of the steel beam 1.
4. The steel strand 5 penetrates through the sensor 3 and the jack 4, a tool anchor 8 and a tool clamping piece are installed at the terminal of the jack 4, two U-shaped grooves 12 are formed in the lifting platform, the jack 4 and the sensor 3 are located on the U-shaped grooves 12, the jack 4 is adjacent to the sensor 3, and the centers of the jack 4 and the sensor 3 are just opposite to each other due to the height of the two U-shaped grooves 12.
5. Starting the test, wherein the main test steps are the same as the prior test technical means and steps:
1) connecting an instrument, starting up, and selecting a correct channel;
2) stretching in a test, wherein the stretching is performed at a constant speed of 0.8 ƒ ptk.Ap in 4 stages from 20% of the stretching control stress, and simultaneously, synchronously recording the reading of each stage of the sensors 3 at the two ends of the test piece;
3) unloading, replacing the working anchor 9 and the working clamping piece 18, and performing a second test;
4) three sets of anchors of each specification are suitable to be tested, and the results are averaged;
5) and (5) cleaning the instrument after the test is finished.
It should be understood that the detailed description of the present invention is only for illustrating the present invention and is not limited by the technical solutions described in the embodiments of the present invention, and those skilled in the art should understand that the present invention can be modified or substituted equally to achieve the same technical effects; as long as the use requirements are met, the method is within the protection scope of the invention.
Claims (4)
1. The utility model provides an anchor mouth rubs and contracts test device of volume of contracting with stranded conductor, includes girder steel (1), anchor backing plate test piece (2), sensor (3), jack (4), steel strand wires (5), its characterized in that: the steel beam comprises at least two steel beams (1), supporting blocks (6) are arranged at two ends of each steel beam (1) together, a cylindrical through hole (7) is formed in the center of each supporting block (6), the outer side of each supporting block (6) can be detachably connected with an anchor backing plate test piece (2), the outer side of each anchor backing plate test piece (2) is connected with a sensor (3) in a matched mode, the outer side of each sensor (3) is connected with a jack (4), the outer side of each jack (4) is connected with a tool anchor (8), and a steel strand (5) penetrates through the tool anchor (8), the jack (4), the sensor (3), the anchor backing plate test piece (2), the supporting blocks (6) and the steel beam (1) respectively;
the lifting type lifting device is further provided with a supporting platform (11), the supporting platform (11) is arranged below the jack (4) and the sensor (3) in a lifting mode and supports the jack (4) and the sensor (3), and a moving wheel (21) is arranged at the bottom end of the supporting platform (11);
the anchor backing plate test piece (2) comprises an anchor backing plate body (13) and a fixing body (14), wherein the fixing body (14) wraps the anchor backing plate body (13) and is detachably connected with the supporting block (6);
the rapid-curing mortar testing device is characterized by further comprising an anchor backing plate testing mold (15), wherein the anchor backing plate testing mold comprises four testing mold plates (16), the testing mold plates (16) are connected in pairs in sequence to form a hollow cubic structure, spiral ribs (17) are fixedly arranged at the center of the anchor backing plate testing mold (15), the anchor backing plate testing mold (15) is fixed to the anchor backing plate body (13) and the fixing body (14), and the fixing body (14) is made of quick-drying mortar.
2. The test device for the friction resistance of the anchor mouth and the retraction amount of the stranded wire according to claim 1, wherein: wherein, a working anchor (9) is arranged between the anchor backing plate test piece (2) and the sensor (3) on one side of the test active end, and a limiting plate (10) is arranged between the working anchor (9) and the sensor (3).
3. The test device for the friction resistance of the anchor mouth and the retraction amount of the stranded wire according to claim 1, wherein: two U-shaped grooves (12) are formed in the supporting platform (11), and the jack (4) and the sensor (3) are clamped in the U-shaped grooves (12).
4. The test device for the friction resistance of the anchor mouth and the retraction amount of the stranded wire according to claim 1, wherein: the anchor backing plate body (13) is of a horn-shaped cylinder shape, and the wide-mouth end of the anchor backing plate body (13) is connected with the sensor (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010848322.7A CN111982375B (en) | 2020-08-21 | 2020-08-21 | Test device for friction resistance and strand retraction amount of anchor mouth |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010848322.7A CN111982375B (en) | 2020-08-21 | 2020-08-21 | Test device for friction resistance and strand retraction amount of anchor mouth |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111982375A CN111982375A (en) | 2020-11-24 |
| CN111982375B true CN111982375B (en) | 2022-03-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010848322.7A Active CN111982375B (en) | 2020-08-21 | 2020-08-21 | Test device for friction resistance and strand retraction amount of anchor mouth |
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Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2226619Y (en) * | 1995-06-13 | 1996-05-08 | 上海钢铁工艺技术研究所 | Anchoring device for stretching prestressed steel strand |
| CN203490017U (en) * | 2013-08-23 | 2014-03-19 | 山西三江工程检测有限公司 | Long-term monitoring device for pre-stressing loss under anchors |
| CN107178038B (en) * | 2017-06-06 | 2023-04-18 | 盛勇 | Anchor backing plate for reducing friction resistance of anchor mouth and horn mouth |
| CN206906220U (en) * | 2017-06-10 | 2018-01-19 | 杭州富锚机械有限公司 | A kind of easy-to-mount anchor mouth friction loss test device |
| CN208884848U (en) * | 2018-08-07 | 2019-05-21 | 重庆市工程管理有限公司 | A kind of Spliced type cover to reinforcement backing plate |
| CN110514526A (en) * | 2019-09-10 | 2019-11-29 | 中铁九局集团工程检测试验有限公司 | Anchorage anchor slab strength testing apparatus and its strength test method |
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2020
- 2020-08-21 CN CN202010848322.7A patent/CN111982375B/en active Active
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