CN110440970A - A kind of system and method positioned at jack head end test anchor lower prestress - Google Patents
A kind of system and method positioned at jack head end test anchor lower prestress Download PDFInfo
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- CN110440970A CN110440970A CN201910739808.4A CN201910739808A CN110440970A CN 110440970 A CN110440970 A CN 110440970A CN 201910739808 A CN201910739808 A CN 201910739808A CN 110440970 A CN110440970 A CN 110440970A
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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
- G01L5/0028—Force sensors associated with force applying means
- G01L5/0033—Force sensors associated with force applying means applying a pulling force
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Abstract
The invention discloses a kind of system and method positioned at jack head end test anchor lower prestress, the system comprises: anchorage, displacement sensor, force snesor, stretch-draw jack, steel strand wires, oil pump, test host, limiting device, intermediate plate；When system is tested, displacement sensor reads intermediate plate displacement in real time, utilizes force snesor real-time detection tensioning force value；The work start and stop state of stretch-draw jack is controlled by test host；It tests displacement and tensioning force value of the host based on real-time detection and draws test curve figure；When displacement reaches setting value, test host control oil pump stops working, and stretch-draw jack stops tensioning, when the present invention is able to solve the test of existing reverse drawing method, intermediate plate is not limited, and ultra stretching is caused, so that there is the technical issues of steel strand wires damage and field accident.
Description
Technical field
The present invention relates to civil engineering quality safety detection technique fields, and in particular, to a kind of displacement sensor and power
Sensor is located at the system and method for effective prestress under jack head end test anchor.
Background technique
Prestressed size is to influence normal use performance in structure service phase to refer mainly in prestressed reinforced concrete construction
Mark, the detection method generallyd use both at home and abroad at present are broadly divided into two classes: detection and directly detection indirectly.Indirect detection technique master
Have: acoustic emission, galvanomagnetic-effect detect skill and technique, ultrasonic Detection Method, and Dynamic testing method and anchor end prestressing force test skill
Art, measuring accuracy are relatively low.Direct Inspection Technology mainly has: presstressed reinforcing steel Direct Inspection Technology, stress free method and
Reverse drawing method.Wherein, presstressed reinforcing steel Direct Inspection Technology, stress free method are answered due to needing pre-buried sensor to limit it
With range, reverse drawing rule is current the most frequently used most reliable detection technique.
The type of reverse drawing method has very much, is broadly divided into entire beam tension and single tendon stretch.Wherein, entire beam tension is to anchor head
Each steel strand wires simultaneous tension to measure the effective prestress of entire anchor head, single tendon stretch is then to twist respectively to each steel
Line carries out tensioning, and the sum of test prestressing force is the effective prestress of anchorage.No matter which kind of method, be generally both needed to test simultaneously
Counter pull and steel strand wires elongation, and be fitted and draw out F-S prestressing force curve, as shown in Figure 3.
When the detection of reverse drawing method starts, counter pull slowly increases, and all parts equipment room gap is further excluded, this stage
Counter pull increase is smaller, and is displaced and increases sharply, and slope is smaller on F-S prestressing force curve, OA section as shown in figure 1；OA sections of knots
Beam, gap is all compacted between all parts, this stage increases with counter pull, and displacement increment is the elasticity of active section steel strand wires
Deformation, slope of a curve tend towards stability, AB section as shown in figure 1；AB sections of ends, counter pull reach under balance anchor effective prestress with
The sum of stiction, counter pull continuous action, completion overcome frictional force, at this point, prestress system will carry out an adjustment, such as scheme
BC section in 1, the friction between this stage intermediate plate and anchorage disappear, and intermediate plate will be displaced outwardly with steel strand wires, until being limited
Plate (cylinder) limits；After intermediate plate loosens, counter pull continues to increase, and displacement increment is anchor cable under active section steel strand wires and anchor at this time
The sum of flexible deformation, it is clear that unit counter pull bring displacement is much bigger at this time, and slope reduces on F-S prestressing force curve,
CD section as shown in figure 1.
It is intuitive and easy to understand using reverse drawing method test its test result of effective prestress, and accuracy is higher, BC as shown in figure 1
Section can use C point to stress value, when not considering frictional force, can use B point to stress value when considering frictional force.
However, reverse drawing method the biggest problems are that when reverse drawing method is tested, if control not will cause the anchorage limit sternly and hold
The loss of power is carried, which is because, in 2 tensioning, intermediate plate can generate opposite between cone mouth with the displacement of steel strand wires
Displacement.At this point, since intermediate plate, the plastic deformation of cone mouth generation and intermediate plate are inevitably generated rotation in displacement process,
To which when putting, intermediate plate can not be fully retracted to original position.The difference of the position is bigger, the steel strand wires (and anchoring)
Limit tension is generally also lower, also bigger to the adverse effect of structural ultimate bearing capacity judgement.
On the one hand existing anti-tension test does not take intermediate plate special limitation, the limit plate still used or limit
Cylinder, the moment that on the other hand cannot be loosened in intermediate plate stop tensioning, and the inflection point in F-S prestressing force curve is indefinite, can not be accurate
Complete F-S curve graph is drawn, i.e. detection will failure.When steel strand wires elongation is larger, it is difficult to ensure that amount of recovery 1mm it
It is interior, to generate very detrimental effect to prestress system.
Summary of the invention
The present invention provides a kind of system and methods positioned at jack head end test anchor lower prestress, existing anti-to solve
When daraf(reciprocal of farad) is tested, intermediate plate is not limited, and leads to ultra stretching, so that the technology for steel strand wires damage and field accident occur is asked
Topic.
For achieving the above object, it is positioned at jack head end test anchor lower prestress this application provides a kind of
System, the system comprises:
Anchorage, displacement sensor, force snesor, stretch-draw jack, steel strand wires, oil pump, test host, limiting device, folder
Piece；
Steel strand wires one end is fixedly connected with stretch-draw jack, and the steel strand wires other end is fixedly connected by intermediate plate with anchorage, edge
Anchorage to stretch-draw jack direction successively are as follows: intermediate plate, limiting device；Intermediate plate is set on steel strand wires, and intermediate plate is placed in steel strand wires
In anchorage hole；Limiting device one end connects with anchorage, and the other end connects with stretch-draw jack；Displacement sensor and force snesor peace
On limiting device；Displacement sensor and force snesor connects with test host, and test host is connect with oil pump, oil pump and
Stretch-draw jack connection；When system is tested, displacement sensor reads intermediate plate displacement in real time, is examined in real time using force snesor
Survey tensioning force value；The work start and stop state of stretch-draw jack is controlled by test host；Test position of the host based on real-time detection
Shifting amount and tensioning force value draw test curve figure；When displacement reaches setting value, test host control oil pump stops working,
Jack is drawn to stop tensioning.
One of present invention is located at the system and method for jack head end test anchor lower prestress, by being located at jack
The displacement of the displacement sensor real-time monitoring intermediate plate of front end, the force value sensor positioned at jack front end read stretching force in real time
Value.When test, stretch-draw jack force value is gradually increased, and when force snesor reaches setting value, displacement sensor counting is set to phase
To zero displacement point, intermediate plate starts to be detached from anchorage, and when displacement biography value reaches preset value, test host control oil pump stops work
Make, stretch-draw jack stops tensioning, effectively prevent ultra stretching.Test host is displaced according to displacement sensor in entire stretching process
Value and force snesor force value draw test curve figure, obtain effective prestress under anchor according to curve map analysis processing.
Preferably, limiting device is hollow structure, and steel strand wires are passed through from the inside of limiting device.
Preferably, by testing the oil pressure of host control oil pump, pass through the work of control oil pump start-up and shut-down control stretch-draw jack
Make start and stop state.
On the other hand, the present invention also provides a kind of method positioned at jack head end test anchor lower prestress, the sides
Method is provided with displacement on limiting device in system based on the mentioned-above system positioned at jack head end test anchor lower prestress
Sensor and force snesor read stretching force by force snesor by displacement sensor real-time monitoring intermediate plate displacement in real time
Value；Displacement sensor is used for real-time monitoring intermediate plate displacement, and displacement sensor is located at jack front end；Force snesor is for real-time
Tensioning force value is monitored, sensor is located at jack front end.
The described method includes:
Preparation stage: sequentially passing through steel strand wires for limiting device, stretch-draw jack, connects oil pump, connecting test host, really
It is good to protect each section communication connection, starts reverse drawing test；
The preload stage: as tensioning carries out, counter pull is gradually increased, and gap is further excluded between all parts, and steel twists
Line gradually tenses, and when sensor readings reach setting value, displacement sensor has an initial displacement value at this time, which is
For the relative position of intermediate plate and anchorage, it is recorded as relative displacement zero point；
Pulling anchor cable stage: counter pull continues to increase, when counter pull reaches the sum of effective prestress and stiction under balance anchor,
Counter pull continuous action, completion overcome frictional force, and counter pull continues to increase, and the friction between intermediate plate and anchorage disappears, and intermediate plate will
As steel strand wires are displaced outwardly, until displacement sensor shift value reaches setting value, test host control oil pump is automatically stopped work
Make, stretch-draw jack no longer tensioning, intermediate plate is also no longer displaced outwardly；
It moves back the top stage: by test host control oil pump start and stop stretch-draw jack work, jack being made to return to initial bit
It sets, removes jack, limiting device.
Further, the method also includes: in entire test process, test host record displacement sensor and power are sensed
The data of device, and it is depicted as curve graph.
Further, by the way that the position of displacement sensor is arranged, so that tensioning system is in the anteposition terminated for the preload stage
Shifting amount is always zero, into pulling anchor cable stage after displacement sensor start counting.
Further, after oil pump stops working, stretch-draw jack stops tensioning, after pressure reaches stable state, passes through
Force snesor is read；After pressure is stablized, steel strand tension dynamic balance inside and outside anchorage, sensor readings size conduct at this time
The original prestressing force of steel strand wires.
Further, the former effective prestress of steel strand wires is then calculated by following formula:
F=F0-ΔF
Wherein, F0For the sensor readings value after pressure plateau, Δ F is tension correction value:
Wherein, Δ L is intermediate plate displacement；κ is displacement when intermediate plate releases occlusion；L is stretching end between anchored end
Distance；A is the nominal area of steel strand wires；EsFor the elasticity modulus of prestress wire.
One or more technical solution provided by the present application, has at least the following technical effects or advantages:
(1) system and method for the invention passes through the displacement of displacement sensor real-time monitoring intermediate plate, reaches in displacement
When setting value, stretch-draw jack stops working, and can effectively prevent ultra stretching；
(2) system and method for the invention passes through the displacement of displacement sensor real-time monitoring intermediate plate, in stretching process knot
Shu Shi can judge whether intermediate plate returns to original position according to the numerical value of displacement sensor, can intuitively judge this tensioning
Whether undesirable influence is caused on overall structure.
(3) force snesor in present system and method can directly read jack tension power in stable state,
When tensioning balances, further according to parameters such as intermediate plate displacements, effective prestress under the anchor for obtaining steel strand wires can be directly calculated.
Detailed description of the invention
Attached drawing described herein is used to provide to further understand the embodiment of the present invention, constitutes one of the application
Point, do not constitute the restriction to the embodiment of the present invention；
Fig. 1 is reverse drawing method schematic diagram；
Fig. 2 is square law device schematic diagram of the invention；
Fig. 3 is the curve graph using effective prestress under method test anchor of the invention；
In figure: 1- anchorage；2- displacement sensor；3- force snesor；4- stretch-draw jack；5- steel strand wires；6- oil pump；7- is surveyed
Try host；8- limiting device；9- intermediate plate.
Specific embodiment
To better understand the objects, features and advantages of the present invention, with reference to the accompanying drawing and specific real
Applying mode, the present invention is further described in detail.It should be noted that in the case where not conflicting mutually, the application's
Feature in embodiment and embodiment can be combined with each other.
In the following description, numerous specific details are set forth in order to facilitate a full understanding of the present invention, still, the present invention may be used also
Implemented with being different from the other modes being described herein in range using other, therefore, protection scope of the present invention is not by under
The limitation of specific embodiment disclosed in face.
One of present invention displacement sensor and force snesor are located at effective prestress under jack head end test anchor
Method, mainly by a set of reverse drawing test macro (Fig. 2) Lai Shixian, which includes: anchorage 1, limiting device 8, tensioning
Jack 4, oil pump 6 and test host 7.Intermediate plate 9 and steel strand wires 5 are provided on anchorage 1, anchorage 1 and intermediate plate 9 are fixed steel strand wires
5；Limiting device 8 is equipped with displacement sensor 2 and force snesor 3, when being tested using the test macro, displacement sensor 2
9 displacement of intermediate plate is read in real time, utilizes 2 real-time detection tensioning force value of force snesor；Stretch-draw jack is controlled by test host 7
4 are mixed into the work start and stop state of oil pump 6；The displacement and tensioning force value of real-time detection are transferred in test host 7, then by surveying
It tries host 7 and draws test curve figure (Fig. 3).When displacement reaches setting value, test 7 control oil pump 6 of host stops working,
It draws jack 4 to stop tensioning, effectively prevent ultra stretching.The curve graph that analysis test host is drawn can be obtained effectively answers in advance under anchor
Power.
Steps are as follows for test method:
1 preparation stage: sequentially passing through steel strand wires for limiting device, stretch-draw jack, connects oil pump, connecting test host,
Ensure that each section communication connection is good, starts reverse drawing test；
2 pre-tighten the stage: as tensioning carries out, counter pull slowly increases, and all parts equipment room gap is further excluded,
Steel strand wires gradually tense, and when sensor readings reach setting value (such as 30KN), (surface is stretch-draw jack center line
It is parallel with anchorage), displacement sensor has an initial displacement value at this time, which is the relative position of intermediate plate and anchorage,
It is recorded as relative displacement zero point；
3 pulling anchor cable stages: counter pull continues to increase, when counter pull reach under balance anchor effective prestress and stiction it
With, counter pull continuous action, completion overcomes frictional force, and counter pull continues to increase, and the friction between intermediate plate and anchorage disappears, intermediate plate
It will be displaced outwardly with steel strand wires, until displacement sensor shift value reaches setting value (such as relative zero is 1mm), test host
Control oil pump is automatically stopped work, stretch-draw jack no longer tensioning, and intermediate plate is also no longer displaced outwardly；
4 move back the top stage: by test host control oil pump start and stop stretch-draw jack work, jack being made to return to initial bit
It sets.Remove jack, limiting device.
In whole process, the data of host record displacement sensor and force snesor are tested, and are depicted as curve graph.
It above also can be by the position of setting displacement sensor, so that tensioning system is displaced before terminating for the preload stage
Amount is always zero, into pulling anchor cable stage after displacement sensor start counting.
After oil pump stops working, stretch-draw jack stop tensioning, after pressure reaches stable state, by force snesor into
Row reading.After pressure is stablized, steel strand tension dynamic balance inside and outside anchorage, sensor readings size can be used as steel strand wires original at this time
There is prestressing force.
High-precision scheme is proposed as one kind, the former effective prestress of steel strand wires is then calculated by following formula:
F=F0-ΔF
Wherein, F0For the sensor readings value after pressure plateau, Δ F is tension correction value:
Wherein, Δ L is intermediate plate displacement, is set as 1mm；
κ is displacement when intermediate plate releases occlusion, can be determined by test.When no experimental data, 0.5mm can be taken as；
L is the distance between stretching end to anchored end, unit mm.In actual test, near linear free segment can use
Length；
A is the nominal area of steel strand wires, unit mm2；
EsIt is 193GPa for the elasticity modulus of prestress wire；
Referring to figure 2. and Fig. 3, a kind of displacement sensor and force snesor are located under jack head end test anchor effectively answers in advance
The method of power is realized by a set of reverse drawing test device.The reverse drawing test device include limiting device, stretch-draw jack,
Test host and oil pump；Displacement sensor and force snesor are provided on the limiting device, institute's displacement sensors are for straight
Connect measurement intermediate plate displacement；The force snesor is for measuring tensioning force value.
Testing procedure of the invention:
Limiting device, stretch-draw jack are sequentially passed through steel strand wires by 1, connect oil pump, connecting test host, it is ensured that each section
Communication connection is good, starts reverse drawing test；
2 carry out with tensioning, and counter pull slowly increases, and all parts equipment room gap is further excluded, steel strand wires by
Gradually tense, when sensor readings reach setting value 30KN (surface be stretch-draw jack center line parallel with anchorage), this
When displacement sensor have an initial displacement value, which is the relative position of intermediate plate and anchorage, is recorded as relative displacement
Zero point；
3 counter pull continue to increase, and when counter pull reaches the sum of effective prestress and stiction under balance anchor, reverse drawing is insisted on
Continuous effect, completion overcome frictional force, and counter pull continues to increase, and the friction between intermediate plate and anchorage disappears, and intermediate plate will be twisted with steel
Line is displaced outwardly, and until displacement sensor shift value reaches setting value 1mm, test host control oil pump is automatically stopped work,
Jack no longer tensioning is drawn, intermediate plate is also no longer displaced outwardly；
4 move back the top stage: by test host control oil pump work, stretch-draw jack being made to return to initial position.Remove thousand
Jin top, limiting device.
In whole process, the data of host record displacement sensor and force snesor are tested, and are depicted as curve graph.Pass through
Curve map analysis is handled, effective prestress value under anchor can be obtained.
Although preferred embodiments of the present invention have been described, it is created once a person skilled in the art knows basic
Property concept, then additional changes and modifications may be made to these embodiments.So it includes excellent that the following claims are intended to be interpreted as
It selects embodiment and falls into all change and modification of the scope of the invention.
Obviously, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art
Mind and range.In this way, if these modifications and changes of the present invention belongs to the range of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to include these modifications and variations.
Claims (8)
1. a kind of system positioned at jack head end test anchor lower prestress, which is characterized in that the system comprises:
Anchorage, displacement sensor, force snesor, stretch-draw jack, steel strand wires, oil pump, test host, limiting device, intermediate plate；
Steel strand wires one end is fixedly connected with stretch-draw jack, and the steel strand wires other end is fixedly connected by intermediate plate with anchorage, along anchorage
Successively to stretch-draw jack direction are as follows: intermediate plate, limiting device；Intermediate plate is set on steel strand wires, and intermediate plate and steel strand wires are placed in anchorage
In hole；Limiting device one end connects with anchorage, and the other end connects with stretch-draw jack；Displacement sensor and force snesor are mounted on
On limiting device；Displacement sensor and force snesor are connect with test host, and test host is connect with oil pump, oil pump and tensioning
Jack connection；When system is tested, displacement sensor reads intermediate plate displacement in real time, utilizes force snesor real-time detection
Value of thrust；The work start and stop state of stretch-draw jack is controlled by test host；Test displacement of the host based on real-time detection
Test curve figure is drawn with tensioning force value；When displacement reaches setting value, test host control oil pump stops working, tensioning thousand
Jin top stops tensioning.
2. the system according to claim 1 positioned at jack head end test anchor lower prestress, which is characterized in that limit dress
It is set to hollow structure, steel strand wires are passed through from two inside of limiting device.
3. the system according to claim 1 positioned at jack head end test anchor lower prestress, which is characterized in that pass through survey
The oil pressure for trying host control oil pump, passes through the work start and stop state of control oil pump start-up and shut-down control stretch-draw jack.
4. a kind of method positioned at jack head end test anchor lower prestress, which is characterized in that the method is based on claim
Any one of system positioned at jack head end test anchor lower prestress in 1-3, which comprises
Preparation stage: limiting device, stretch-draw jack are sequentially passed through into steel strand wires, connect oil pump, connecting test host, it is ensured that is each
Part communication connection is good, starts reverse drawing test；
The preload stage: as tensioning carries out, counter pull is gradually increased, and gap is further excluded between all parts, steel strand wires by
It gradually tenses, when sensor readings reach setting value, displacement sensor has an initial displacement value at this time, which is to press from both sides
The relative position of piece and anchorage is recorded as relative displacement zero point；
Pulling anchor cable stage: counter pull continues to increase, when counter pull reaches the sum of effective prestress and stiction under balance anchor, reverse drawing
Power continuous action, completion overcome frictional force, and counter pull continues to increase, and friction between intermediate plate and anchorage disappears, and intermediate plate will be with
Steel strand wires are displaced outwardly, and until displacement sensor shift value reaches setting value, test host control oil pump is automatically stopped work,
Jack no longer tensioning is drawn, intermediate plate is also no longer displaced outwardly；
It moves back the top stage: by test host control oil pump start and stop stretch-draw jack work, so that jack is returned to initial position, take
Lower jack, limiting device.
5. the method according to claim 4 positioned at jack head end test anchor lower prestress, which is characterized in that the side
Method further include: in entire test process, test the data of host record displacement sensor and force snesor, and be depicted as curve
Figure.
6. the method according to claim 4 positioned at jack head end test anchor lower prestress, which is characterized in that use position
Displacement sensor real-time detection intermediate plate displacement；By the way that the position of displacement sensor is arranged, so that tensioning system is for the preload stage
Displacement is always zero before end, into pulling anchor cable stage after displacement sensor start counting.
7. the method according to claim 4 positioned at jack head end test anchor lower prestress, which is characterized in that work as oil pump
After stopping working, stretch-draw jack stops tensioning, after pressure reaches stable state, is read by force snesor；Pressure is steady
After fixed, steel strand tension dynamic balance inside and outside anchorage, sensor readings size is as the original prestressing force of steel strand wires at this time.
8. the method according to claim 4 positioned at jack head end test anchor lower prestress, which is characterized in that steel strand wires
Former effective prestress then calculated by following formula:
F=F0-ΔF
Wherein, F0For the sensor readings value after pressure plateau, Δ F is tension correction value:
Wherein, Δ L is intermediate plate displacement；κ is displacement when intermediate plate releases occlusion；L be stretching end between anchored end away from
From；A is the nominal area of steel strand wires；EsFor the elasticity modulus of prestress wire.
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| CN112461407A (en) * | 2020-09-29 | 2021-03-09 | 河南牛帕力学工程研究院 | Stress detection method for prestressed tendon |
| CN112461408A (en) * | 2020-09-29 | 2021-03-09 | 河南牛帕力学工程研究院 | Prestressed tendon stress detection method |
| CN113008432A (en) * | 2021-02-05 | 2021-06-22 | 郑州东辰科技有限公司 | Effective stress detection method and effective stress detection device |
| CN113340510A (en) * | 2021-05-21 | 2021-09-03 | 中铁大桥局集团有限公司 | High-strength screw fastening detection device and fastening detection method thereof |
| CN113514184A (en) * | 2021-09-14 | 2021-10-19 | 四川交达预应力工程检测科技有限公司 | Anchoring force detection device and measurement calculation method |
| CN114720039A (en) * | 2022-06-02 | 2022-07-08 | 四川升拓检测技术股份有限公司 | Method for measuring effective prestress under anchor of finish rolling deformed steel bar |
| CN115030240A (en) * | 2022-06-30 | 2022-09-09 | 甘肃路桥建设集团有限公司 | Automatic monitoring method and automatic monitoring equipment for anchorage device static load test process |
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Application publication date: 20191112 |