CN209280187U - Detecting and the system for stablizing effective prestress under intermediate plate displacement method test anchor - Google Patents
Detecting and the system for stablizing effective prestress under intermediate plate displacement method test anchor Download PDFInfo
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- CN209280187U CN209280187U CN201822259799.2U CN201822259799U CN209280187U CN 209280187 U CN209280187 U CN 209280187U CN 201822259799 U CN201822259799 U CN 201822259799U CN 209280187 U CN209280187 U CN 209280187U
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- intermediate plate
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Abstract
The utility model discloses a kind of systems of effective prestress under detecting and stable intermediate plate displacement method test anchor, including main control terminal, detection terminal, self-locking electromagnetic switch control hydraulic system, bridge pressure sensor and displacement measurement tooling；The executive component end positive pressure of the self-locking electromagnetic switch control hydraulic system installs the bridge pressure sensor, the other end and institute's displacement measurement tooling of the bridge pressure sensor assemble, for one end positive pressure installation settings of institute's displacement measurement tooling far from bridge pressure sensor in the intermediate plate in anchor head hole, the intermediate plate and steel strand wires are affixed.The utility model without read knee of curve, and intermediate plate protruded length uneven for intermediate plate frictional resistance it is inconsistent caused by be unable to test and test error is larger or even the safety accident that intermediate plate flies out occurs to play an effective role in the control.
Description
Technical field
The utility model relates to civil engineering quality safety detection technique field, especially a kind of detecting and stable intermediate plate position
The system that shifting method tests effective prestress under anchor.
Background technique
Post-stressed size is the direct important indicator for measuring prestressed structure performance, the most frequently used and reliable at present
Property relatively high detection method be reverse drawing method.
There are many tests also of reverse drawing method, can be greatly classified into whole beam and single two kinds of test forms.Entire beam tension is pair
Each steel strand wires simultaneous tension of anchor head measures the sum of the effective prestress of entire anchor head, and single tendon stretch is respectively to each steel
Twisted wire carries out tensioning, and surveying single prestressed and value is effective prestress value under anchor, whether entire beam tension or single
Its standard curve of tensioning, which can be obtained and be fitted using reverse drawing method, draws out F-S prestressing force curve, such as Fig. 1.
Reverse drawing method detection process is basically divided into 4 stages, the first stage: after counter pull starts, opening between each structure
Begin to coordinate to pre-tighten, which increases comparatively fast, and power increase is slower, OA section as shown in figure 1；Second stage: pre- next with anti-
Pulling force increases, and the revealed section steel strand wires displacement increment that starts to be stretched slows down, AB section as shown in figure 1；Phase III: counter pull reaches
Effective prestress and intermediate plate frictional resistance and after being worth under anchor, internal steel strand wires free segment begins participating in stretching, at this time freedom length
Variation force value can reduce suddenly, such as the BC section in Fig. 1；Fourth stage: with continuing for counter pull, intermediate plate and steel strand wires are simultaneously
It is displaced outwardly, apparent inflection point occurs in curve, and slope reduces on F-S prestressing force curve, CD section as shown in figure 1.
Existing reverse drawing method test effective prestress accuracy is higher, and BC section as shown in figure 1 takes C point when considering frictional force
To stress value, when not considering frictional force, take B point to stress value.
The maximum test of current reverse drawing method is mainly bathmometry and limit method, and bathmometry mainly passes through power and steel beam
The inflection point of global displacement relation curve carries out effective prestress value under judgement anchor, bathmometry main problem are as follows: due to entire beam tension
Caused by each steel strand wires incoordination so that some intermediate plate frictional resistances are larger, some intermediate plate frictional resistances are smaller, larger for frictional resistance
Intermediate plate cause an intermediate plate when putting that can not return to original position since infinite place mechanism can generate overshoot or intermediate plate disturbance
It sets, the influence to structural bearing capacity is also bigger, and intermediate plate lesser for frictional resistance is difficult to reverse drawing inflection point occur sometimes, leads to result
Can not normal interpretation, influence recall rate and detection safety；The main problem of limit method are as follows: generally read when limit point reaches
Numerical value, due to overcoming the steel strand wires freedom length increase for participating in stretching after intermediate plate frictional resistance to cause intermediate plate that can go out in stretching process
It now bounces back, only reading limit point value, to will lead to test result bigger than normal, and reading stationary value, then to will lead to test result less than normal, leads
It causes test result unstable or even intermediate plate loosens and causes safety accident, there are problems for existing method in summary, it is difficult to protect
Demonstrate,prove detection accuracy, stability and safety of structure.
Utility model content
To solve problems of the prior art, the utility model provides a kind of detecting and stable intermediate plate displacement method is surveyed
The system for trying effective prestress under anchor.
The technical solution adopted in the utility model is:
The system of effective prestress under a kind of detecting and stable intermediate plate displacement method test anchor, including self-locking electromagnetic switch control
Hydraulic system, bridge pressure sensor and displacement measurement tooling processed；
The self-locking electromagnetic switch control hydraulic system includes executive component, oil pump and connection executive component and oil pump
Oil pipe, the oil pipe is the hydraulic flow tube of super-pressure resin, the executive component of self-locking electromagnetic switch control hydraulic system
Affixed with steel strand wires, the executive component end positive pressure of the self-locking electromagnetic switch control hydraulic system installs the bridge-type pressure
Sensor, the other end of the bridge pressure sensor and the positive press-fit of institute's displacement measurement tooling, institute's displacement measurement tooling
For one end positive pressure installation settings far from bridge pressure sensor in the intermediate plate in anchor head hole, the intermediate plate and steel strand wires are affixed；
Institute's displacement measurement tooling includes tubular moveable anchor, hall displacement transducer and displacement transmission mechanism；It is described
Axial direction in the side wall of moveable anchor along moveable anchor is successively arranged the displacement transmission mechanism and hall displacement transducer, the displacement
Transmission mechanism is located at hall displacement transducer close to one end of intermediate plate, and the displacement transmission mechanism and hall displacement transducer
Abutting end mutually supports, and the other end of the displacement transmission mechanism is mutually supported with intermediate plate and anchor head.
Preferably, the moveable anchor is used to accommodating and limiting intermediate plate position close to one end of intermediate plate equipped with what is be recessed inwardly
The other end of limited step, the displacement transmission mechanism exposes to the table top of limited step and intermediate plate and anchor head mutually support.
Preferably, the side wall of the moveable anchor opens up fluted along its axial direction, and the hall displacement transducer and displacement pass
It passs mechanism to be set in groove, the groove just enough accommodates hall displacement transducer and displacement transmission mechanism.
It preferably, further include main control terminal and detection terminal, the main control terminal is connected with detection terminal by wireless WIFI
Connect, the main control terminal and self-locking electromagnetic switch control hydraulic system signal are connect, the detection terminal respectively with bridge-type pressure
Force snesor is connected with hall displacement transducer signal.
The beneficial effects of the utility model are:
1, there is practical, detection high reliablity, the few feature of test problems passes through setting and detects and stablize intermediate plate position
The hall displacement transducer of shifting amount, the displacement of energy precise measurement and control intermediate plate in system work process, can be effective
The disturbance for avoiding intermediate plate is effectively controlled original prestressed variation.
2, it having the characteristics of easy operation, full rotation type operating mode only needs simple operations control system after being installed,
Stretching measurement can disposably be completed and move back beam work, while power and displacement and time relationship hyperbolic chart (such as Fig. 4) can be presented,
By Fig. 4 this it appears that displacement can be stablized the numerical value in setting by system, and the output of system force value is also more stable；Together
When, without reading knee of curve, not had an impact to original prestressing force.
3, have the characteristics that detection is highly-safe, be provided with displacement target value and pulling force limit value duplicate protection program, effectively
Ground has ensured operator's safety, while also having ensured that prestressed structure is not damaged.
4, have the characteristics that detection accuracy is high, test scope is big, the displacement in the present invention can independently be set, and be met not
The test request of same type structure improves test scope, meanwhile, many when by having evaded traditional equipment detection unfavorable ask
Topic finally improves whole detection precision so that the precision of intermediate parameters further increases when detection.
Detailed description of the invention
Fig. 1 is anchor cable reverse drawing F-S curve；
Fig. 2 is the system detecting and stablizing intermediate plate displacement method in the utility model embodiment 1 and test effective prestress under anchor
Structural schematic diagram；
Fig. 3 is the structural schematic diagram of displacement measurement tooling in Fig. 2；
Fig. 4 is the testing result curve graph of the utility model；
Appended drawing reference: 1, moveable anchor, 2, groove, 3, bridge-type displacement sensor, 4, displacement transmission mechanism, 5, limited step,
6, displacement measurement tooling, 7, anchor head, 8, intermediate plate, 9, bridge pressure sensor, 10- 1, executive component, 10-2, oil pump, 10-3,
Oil pipe, 11, detection terminal, 12, main control terminal, 13, steel strand wires.
Specific embodiment
The embodiments of the present invention are described in detail with reference to the accompanying drawing.
Embodiment 1
As shown in Fig. 2, the system that a kind of detecting and stable intermediate plate displacement method test effective prestress under anchor, including master control are whole
End 12, detection terminal 11, self-locking electromagnetic switch control hydraulic system, bridge pressure sensor 9 and displacement measurement tooling 6；
The main control terminal 12 is connect with detection terminal 11 by wireless WI F I, the main control terminal 12 and self-locking electricity
Magnetic commutation control hydraulic system signal connection, the detection terminal 11 respectively with bridge pressure sensor 9 and displacement measurement tooling 6
Signal connection；
The self-locking electromagnetic switch control hydraulic system includes that executive component 10-1, oil pump 10-2 and connection execute member
The oil pipe 10-3, the oil pipe 10-3 of part 10-1 and oil pump 10-2 is the hydraulic flow tube of super-pressure resin, and the self-locking electromagnetism changes
Executive component 10-1 and steel strand wires 13 to control hydraulic system is affixed, and the self-locking electromagnetic switch control hydraulic system is held
Units 10-1 end positive pressure installs the bridge pressure sensor 9, the other end and institute's rheme of the bridge pressure sensor 9
The positive press-fit of shift measurement tooling 6, one end positive pressure installation settings of the institute's displacement measurement tooling 6 far from bridge pressure sensor 9 in
Intermediate plate 8 in 7 hole of anchor head, the intermediate plate 8 and steel strand wires 13 are affixed.
Specifically, as shown in figure 3, institute's displacement measurement tooling 6 includes tubular moveable anchor 1, hall displacement transducer 3
With displacement transmission mechanism 4；The moveable anchor 1 is equipped with the limited step 5 being recessed inwardly close to one end of intermediate plate 8, and the intermediate plate 8 can
It is contained in the sunk area that the invagination of limited step 5 is formed, the side wall of the moveable anchor 1 opens up fluted 2 along its axial direction, described
The displacement transmission mechanism 4 and hall displacement transducer 3 are successively arranged in groove 2, the groove 2 just enough accommodates Hall displacement
Sensor 3 and displacement transmission mechanism 4, the displacement transmission mechanism 4 are located at hall displacement transducer 3 close to one end of intermediate plate 8,
And the displacement transmission mechanism 4 and the abutting end of hall displacement transducer 3 mutually support, it is described to be displaced the another of transmission mechanism 4
The table top that end exposes to limited step 5 is mutually supported with intermediate plate 8 and anchor head 7；.
Limited step is for accommodating and limiting intermediate plate, and groove is for accommodating and limiting hall displacement transducer and displacement transmitting
Mechanism can avoid intermediate plate, hall displacement transducer and displacement transmission mechanism lateral movement by above-mentioned limitation, apply intermediate plate forward direction
For power on displacement transmission mechanism, hall displacement transducer, the displacement of intermediate plate is more accurately transferred to hall displacement transducer detection,
Improve final detection accuracy.For those skilled in the art, displacement transmission mechanism is conventional equipment, can be according to practical feelings
The highly sensitive displacement transmission mechanism of condition selection, does not repeat excessively herein.
In system construction detection process, after intermediate plate, steel strand wires, anchor head three occlusion are firm, intermediate plate can pass through with steel strand wires
Pawl being interlocked tightly.Simultaneously because the machining accuracy of intermediate plate, anchor head, steel strand wires and the technique of live lashing because
Element, there are different size of bite force between intermediate plate and anchor head, for prestress system system after the completion of construction by intermediate plate
It may be regarded as an entirety with steel beam, overcome intermediate plate frictional resistance completely by being subjected to displacement it together while guaranteeing, pass through different length
The steel beam of degree is modified to its force value, can accurately calculate effective prestress value under anchor, solves the detection of minimum strain principle
The error of the inconsistent generation of intermediate plate frictional resistance in the process.Since there are rebound phenomenon, simple switches for steel beam in the detection process
Limit cannot test effective force value from steady mode by dynamic, under the value and actual anchors after retraction effective prestress value deviation compared with
Greatly, it is difficult to guarantee measuring accuracy, the whole holding which forms after enabling to intermediate plate to be engaged with steel beam by PID control is certainly
By state, and implement dynamic detection from steady, it can be to have under accuracy test anchor by the steel Shu Jinhang test value amendment of different length
Imitate prestress value.
According to steel strand wires lengthening variable formula:
Wherein, FSFor force value, L is the effective length of presstressed reinforcing steel, and A is steel strand wires area, and E is steel strand wires elasticity modulus,
△ L is presstressed reinforcing steel retracted length；
Following table is different intermediate plate retractions or pulls out influence of the displacement to testing result.
As seen from the above table, when steel Shu Changdu is 10 meters, the retraction or pull-out displacement variable of intermediate plate are to detection
As a result it is affected, bathmometry and limit method can not effectively solve the problems, such as this at present.In order to solve this problem, this system
Effective prestress under anchor can be detected by the common cooperation of electronic control system and accurate hydraulic control system.
Embodiment 2
It is a kind of that the system of effective prestress under anchor is tested using detecting described in embodiment 1 and stable intermediate plate displacement method
Test method includes the following steps:
Steel strand wires are sequentially passed through anchor head, intermediate plate, the moveable anchor of displacement measurement tooling, bridge-type pressure by S1, installation detecting system
It is affixed with the executive component of self-locking electromagnetic switch control hydraulic system after force snesor, and steel strand wires are also affixed with intermediate plate, make
Anchor head, intermediate plate, displacement transmission mechanism, hall displacement transducer be in close contact, make displacement measurement tooling, bridge pressure sensor and
Self-locking electromagnetic switch controls hydraulic system and is in close contact；
S2, detection system pre-tighten, and control liquid to hall displacement transducer, bridge pressure sensor, self-locking electromagnetic switch
Pressure system, detection terminal and main control terminal, which are powered, to be run, and is passed through main control terminal and is controlled self-locking electromagnetic switch control hydraulic system
Executive component stretch steel strand wires, by detection terminal read bridge pressure sensor and hall displacement transducer reading, when
When bridge pressure sensor counting reaches certain numerical value, set by the hall displacement transducer reading that main control terminal will test terminal
Zero, stablize to record the displacement action amount after intermediate plate loosens and to control equilibrium state；
S3, the setting of detection system detection parameters are that displacement target value phase is arranged in intermediate plate displacement and bridge pressure sensor
The limit value answered, the displacement target value ensure that intermediate plate remains at one and loosens free state, which is inspection
Hall displacement transducer corresponding reading when examining system is stablized；
As long as counter pull F > Fy+Fj, intermediate plate just will appear loosening, and intermediate plate can generate displacement S at this time, participates in the steel stretched and twists
The length of line will increase, and reducing suddenly so as to cause force value causes intermediate plate to bounce back, and influence test result；In order to accurately calculate Fy,
Displacement S after intermediate plate must be made to loosen stablizes in a steady state value, therefore displacement target value is arranged for intermediate plate and detects standard value, the position
Moving target value detecting standard value is hall displacement transducer corresponding reading when detection system is stablized；
Wherein, F is counter pull, the maximal force for both having overcome intermediate plate frictional resistance to need；
FyFor effective prestress value under anchor head, it is both stable after the corresponding bridge pressure sensor of displacement S reading；
FjFor the frictional resistance of intermediate plate and anchor head；
S is the corresponding reading of hall displacement transducer after detection system is stablized, unit mm；
S4, the setting of detection system security parameter, are arranged a safe pulling force limit value for steel strand wires, when detection terminal reads bridge
When the reading of formula pressure sensor reaches the safe pulling force limit value of setting, then the control of self-locking electromagnetic switch is stopped by main control terminal
Hydraulic system processed；
S5, effective prestress detection execute member by main control terminal control self-locking electromagnetic switch control hydraulic system
Part stretches steel strand wires, and controlling hydraulic system by PID control self-locking electromagnetic switch using main control terminal keeps the displacement S of intermediate plate steady
It is scheduled on the displacement target value of step S3 setting, the counting of bridge pressure sensor at this time is effective prestress F under anchory, pass through
The counting F for the bridge pressure sensor that main control terminal storage record detection terminal is ready, detection completion；As there are also Detection task,
Then repeat step S1-S4；Such as without Detection task, then system is closed；Wherein, main control terminal passes through PID control oil inlet and fuel-displaced
The holding of amount and system balancing state reaches optimal control parameter, by setting to whole system parameter to guarantee to detect
Precision and structure safety.
Specifically, in step s 2, the range of certain numerical value described in the certain numerical value that bridge pressure sensor reaches is
5kN-10kN。
Specifically, in step s 4, displacement target value is arranged according to actual conditions, according to intermediate plate difference protruded length and beam length
Degree dynamic adjusts and carries out force value amendment.
Specific embodiment of the present utility model above described embodiment only expresses, the description thereof is more specific and detailed,
But it should not be understood as limiting the scope of the patent of the utility model.It should be pointed out that for the common of this field
For technical staff, without departing from the concept of the premise utility, various modifications and improvements can be made, these all belong to
In the protection scope of the utility model.
Claims (4)
1. a kind of detecting and the system for stablizing effective prestress under intermediate plate displacement method test anchor, which is characterized in that including self-locking
Electromagnetic switch controls hydraulic system, bridge pressure sensor and displacement measurement tooling；
The self-locking electromagnetic switch control hydraulic system includes executive component, oil pump and the oil for connecting executive component and oil pump
Pipe, the oil pipe are the hydraulic flow tube of super-pressure resin, the executive component and steel of the self-locking electromagnetic switch control hydraulic system
Twisted wire is affixed, and the executive component end positive pressure of the self-locking electromagnetic switch control hydraulic system installs the bridge-type pressure sensing
Device, the other end of the bridge pressure sensor and the positive press-fit of institute's displacement measurement tooling, institute's displacement measurement tooling are separate
For one end positive pressure installation settings of bridge pressure sensor in the intermediate plate in anchor head hole, the intermediate plate and steel strand wires are affixed；
Institute's displacement measurement tooling includes tubular moveable anchor, hall displacement transducer and displacement transmission mechanism；The tool
Axial direction in the side wall of anchor along moveable anchor is successively arranged the displacement transmission mechanism and hall displacement transducer, the displacement transmitting
Mechanism is located at hall displacement transducer close to one end of intermediate plate, and the displacement transmission mechanism and hall displacement transducer is adjacent
End mutually supports, and the other end of the displacement transmission mechanism is mutually supported with intermediate plate and anchor head.
2. detecting according to claim 1 and the system for stablizing effective prestress under intermediate plate displacement method test anchor, feature
It is, the moveable anchor is equipped with the limited step for being used to accommodate and limit intermediate plate position being recessed inwardly close to one end of intermediate plate,
The other end of the displacement transmission mechanism exposes to the table top of limited step and intermediate plate and anchor head mutually support.
3. detecting according to claim 2 and the system for stablizing effective prestress under intermediate plate displacement method test anchor, feature
Be, the side wall of the moveable anchor opened up along its axial direction it is fluted, the hall displacement transducer and displacement transmission mechanism be all provided with
In in groove, the groove just enough accommodates hall displacement transducer and displacement transmission mechanism.
4. effective prestress is under detecting according to claim 1-3 and stable intermediate plate displacement method test anchor
System, which is characterized in that further include main control terminal and detection terminal, the main control terminal is connected with detection terminal by wireless WIFI
Connect, the main control terminal and self-locking electromagnetic switch control hydraulic system signal are connect, the detection terminal respectively with bridge-type pressure
Force snesor is connected with hall displacement transducer signal.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201822259799.2U CN209280187U (en) | 2018-12-29 | 2018-12-29 | Detecting and the system for stablizing effective prestress under intermediate plate displacement method test anchor |
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| CN201822259799.2U CN209280187U (en) | 2018-12-29 | 2018-12-29 | Detecting and the system for stablizing effective prestress under intermediate plate displacement method test anchor |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109682519A (en) * | 2018-12-29 | 2019-04-26 | 四川陆通检测科技有限公司 | Detecting and the system and method for stablizing effective prestress under intermediate plate displacement method test anchor |
| CN114812907A (en) * | 2022-06-30 | 2022-07-29 | 四川交达预应力工程检测科技有限公司 | Whole hole detection system and detection method of porous anchor |
-
2018
- 2018-12-29 CN CN201822259799.2U patent/CN209280187U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109682519A (en) * | 2018-12-29 | 2019-04-26 | 四川陆通检测科技有限公司 | Detecting and the system and method for stablizing effective prestress under intermediate plate displacement method test anchor |
| CN114812907A (en) * | 2022-06-30 | 2022-07-29 | 四川交达预应力工程检测科技有限公司 | Whole hole detection system and detection method of porous anchor |
| CN114812907B (en) * | 2022-06-30 | 2022-09-13 | 四川交达预应力工程检测科技有限公司 | Whole hole detection system and detection method of porous anchor |
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