CN110132349A - The system and method for prestressed concrete beam temperature gradient identification effective prestress - Google Patents
The system and method for prestressed concrete beam temperature gradient identification effective prestress Download PDFInfo
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- CN110132349A CN110132349A CN201910372457.8A CN201910372457A CN110132349A CN 110132349 A CN110132349 A CN 110132349A CN 201910372457 A CN201910372457 A CN 201910372457A CN 110132349 A CN110132349 A CN 110132349A
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- 239000011513 prestressed concrete Substances 0.000 title claims abstract description 22
- 238000000034 method Methods 0.000 title abstract description 16
- 238000012360 testing method Methods 0.000 claims abstract description 51
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 20
- 239000010959 steel Substances 0.000 claims abstract description 20
- 238000004080 punching Methods 0.000 claims abstract description 17
- 239000004567 concrete Substances 0.000 claims abstract description 7
- 238000010276 construction Methods 0.000 claims description 21
- 238000010998 test method Methods 0.000 claims description 13
- 230000007774 longterm Effects 0.000 claims description 11
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 10
- 230000002787 reinforcement Effects 0.000 claims description 9
- 229910052742 iron Inorganic materials 0.000 claims description 5
- 239000000565 sealant Substances 0.000 claims description 5
- 230000001360 synchronised effect Effects 0.000 claims description 5
- 238000009434 installation Methods 0.000 claims description 4
- 230000003014 reinforcing effect Effects 0.000 claims description 4
- 230000003247 decreasing effect Effects 0.000 claims description 2
- 238000005259 measurement Methods 0.000 claims description 2
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 230000008054 signal transmission Effects 0.000 claims description 2
- 239000004744 fabric Substances 0.000 claims 1
- 238000011160 research Methods 0.000 description 14
- 230000005540 biological transmission Effects 0.000 description 10
- 238000005516 engineering process Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 230000010412 perfusion Effects 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000523 sample Substances 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 238000004873 anchoring Methods 0.000 description 1
- 230000036760 body temperature Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000003447 ipsilateral effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000002277 temperature effect Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/38—Concrete; Lime; Mortar; Gypsum; Bricks; Ceramics; Glass
- G01N33/383—Concrete or cement
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- Engineering & Computer Science (AREA)
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- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
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Abstract
The invention discloses a kind of system and methods of prestressed concrete beam temperature gradient identification effective prestress, including punching pressure sensor, temperature sensor, automatic test acquisition system and computer；Punching pressure sensor is placed on and extends on the steel strand wires outside beam body, and between work anchor and beam body, for measuring the numerical value of anchor lower prestress；Temperature sensor is embedded in prestressed concrete beam, for measuring the concrete temperature of beam body different cross section height；Automatic test acquisition system is connect with the pressure sensor, temperature sensor respectively, and carries out automatic synchronization acquisition to the temperature of beam body and pressure, then carries out long-range reading data by the built-in computer software.
Description
Technical field
The present invention relates to a kind of system and methods of prestressed concrete beam temperature gradient identification effective prestress.
Background technique
Here statement only provides background technique related to the present invention, without inevitably constituting the prior art.
At home under the drive of rapid economic development, bridge construction also enters the stage grown rapidly.Wherein prestressing force is mixed
Solidifying soil bridge structure is because of its good service performance and superior span ability, in the big rule of highway, railroad bridge construction field
Mould is promoted.And as pre-stressed bridge develops, there is also various problems to be also found therewith.According to studies have shown that
Pre-stressed bridge makes element mechanics performance constantly decay under the influence of the natural causes such as weather, environment.Temperature effect to answering in advance
Power is a crucial influence factor, and the prestress wire thermal expansion stress under different temperatures level can generate variation, in temperature
When degree change of gradient is larger, the influence to effective prestress under anchor is also larger., longitudinal prestressing higher for some depth of sections
The longer beam body of steel Shu Changdu, temperature change should not be underestimated on prestressed influence.
The current still blank of the research of prestress change rule of inventor's discovery under the effect of beam body section temperature difference,
It still needs to further probe into.
Summary of the invention
In order to solve the problems in the existing technology, the invention discloses a kind of prestressed concrete beam anchor lower prestress
With section Vertical Temperature Gradient test macro and method, influence to cast anchor the research of lower stretching force variation to carry out beam body section temperature
Provide a kind of test method.Steel strand wires anchor lower prestress and section temperature difference test method described in the invention is easy,
Fast, test data is accurate, smaller on work progress influence, and damage will not be generated to beam body itself.This kind of test macro can be with
Long-range long-term observation synchronous with temperature gradient realization to beam body prestressing force, is not limited by construction site.The system is to research anchor
The regular relationship degree of lower effective prestress and the vertical temperature ladder in section provides important evidence, subsequent further to carry out varying environment
The research that the lower temperature in area influences anchor lower prestress is effectively improved pre- with instructing the tension construction technology in varying environment area
Stress tension construction quality.
The purpose of first invention of the invention is to propose a kind of prestressed concrete beam anchor lower prestress and the vertical temperature in section
Gradient test macro, the system can be applied to the research that varying environment area underbeam temperature influences anchor lower prestress, with
Tension construction technology under the weather conditions of different regions is instructed, tensioning construction quality is effectively improved.
In order to reach above-mentioned first invention purpose, the present invention uses following technological means:
A kind of prestressed concrete beam anchor lower prestress and section Vertical Temperature Gradient test macro, including punching pressure
Sensor, temperature sensor, automatic test acquisition system and computer；
The punching pressure sensor, is placed on and extends on the steel strand wires outside beam body (beam body steel strand anchoring
End), and between work anchor and beam body, for measuring the numerical value of anchor lower prestress；
The temperature sensor, is embedded in prestressed concrete beam, for measuring the mixed of beam body different cross section height
Solidifying soil temperature degree；
The automatic test acquisition system is connect with the pressure sensor, temperature sensor respectively, and to beam body
Temperature and pressure carry out automatic synchronization acquisition, long-range reading data is then carried out by the built-in computer software.
The present invention also provides a kind of prestressed concrete beam anchor lower prestress and section Vertical Temperature Gradient test method,
Specific steps are as follows:
(1) mounting temperature sensor: after main beam structure tie with reinforcing bar, in beam body two sides web reinforcement along section height
Degree direction is bound using iron tied silk.According to the depth of section of beam body, temperature sensor equidistant placement can be carried out appropriate
It increases or decreases；
(2) pressure sensor is installed: after the completion of steel stranded wire penetrating adapter, pressure sensor, stretching construction being installed under work anchor
It crosses Cheng Qian punching pressure sensor is placed between working instrument anchor and beam body, billet is placed in sensor two sides, guarantees
Sensor contact uniform force is subsequently mounted limit plate, jack and moveable anchor；
(3) it connects automatization test system: equidistantly being buried in pressure sensor installation and temperature sensor along depth of section
After the completion, it is attached with automatization test system, then by cable or wireless transmission by automatization test system with
Computer is coupled, and then carries out parameter setting to automatic collecting system, realizes synchronous acquisition；
(4) start after being installed carry out stretching construction, start to carry out graduation tensioning using intelligent tensioning, and start into
The long-term test job of row anchor lower prestress and beam body section temperature difference data.
Further, step (1) described temperature sensor is mounted on the framework of steel reinforcement of beam body in the above method, described
Temperature sensor and framework of steel reinforcement between bound using iron tied silk, be then uniformly applied to outside sensor with by sealant
Portion, to prevent in concrete perfusion and temperature sensor falls off when vibrating.
Further, step (1) described temperature sensor is along beam body depth of section equidistant placement in beam in the above method
Internal portion appropriate can be increased or decreased according to the temperature sensor mounted quantity of the height in beam body section, this outer beam body
Longitudinal direction can carry out the test of the temperature gradient in multiple sections.
Further, in the above method in step (2) between punching pressure sensor and beam body and pressure sensing
Billet is placed between device and working instrument anchor, contact surface is uniformly contacted with beam body, anchorage before and after guaranteeing pressure sensor, it is ensured that anchor
The accuracy of lower prestress test data.
Further, in the above method in step (3) automatization test system using too can plate power supply mode, guarantee from
Dynamicization test macro can long-term work without external power supply.By wireless signal transmission equipment, realize that left unguarded is remotely believed
Number control, achieve the purpose that long term data test.
Compared with prior art, the invention has the benefit that
Anchor lower prestress and section temperature difference test method described in the invention is easy, and fast, test data is accurate,
It is smaller on work progress influence, damage will not be generated to beam body itself.This kind of test macro and method can be to beam body prestressing force
Long-range long-term observation is realized with temperature gradient, is not limited by construction site.
The test method and system provide important scientific research to effective prestress under research anchor and section Vertical Temperature Gradient
Foundation, it is subsequent further to carry out the research that temperature influences anchor lower prestress under varying environment area, to instruct varying environment
The stretching construction process in area, effectively improves tensioning construction quality.
Detailed description of the invention
The Figure of description for constituting a part of the invention is used to provide further understanding of the present invention, and of the invention shows
Examples and descriptions thereof are used to explain the present invention for meaning property, does not constitute improper limitations of the present invention.
Fig. 1 is test macro integrated connection schematic diagram；
Fig. 2 is that temperature sensor buries schematic diagram；
Fig. 3 is beam body cross sectional elevation；
Fig. 4 is the installation of punching pressure sensor and stretching construction procedure chart；
In figure: 1 is jack；2 be billet；3 be limit plate；4 be work anchor；5 be punching pressure sensor；6 are
Temperature sensor；7 be computer；8 be automatization test system；9 be solar panels；10 emit for wireless signal and receive dress
It sets；11 be beam body；12 be prestress wire.
Specific embodiment
It is noted that following detailed description is all illustrative, it is intended to provide further instruction to the present invention.Unless another
It indicates, all technical and scientific terms used herein has usual with general technical staff of the technical field of the invention
The identical meanings of understanding.
It should be noted that term used herein above is merely to describe specific embodiment, and be not intended to restricted root
According to exemplary embodiments of the present invention.As used herein, unless the context clearly indicates otherwise, otherwise singular
Also it is intended to include plural form, additionally, it should be understood that, when in the present specification using term "comprising" and/or " packet
Include " when, indicate existing characteristics, step, operation, device, component and/or their combination.
As background technique is introduced, according to studies have shown that pre-stressed bridge the natural causes such as weather, environment shadow
Under sound, element mechanics performance is made constantly to decay, longitudinal prestressing steel Shu Changdu longer beam higher for some depth of sections
Body, temperature change should not be underestimated on prestressed influence.Inventor's discovery is pre- under the effect of beam body section temperature difference
The current still blank of the research of variation of stress, still needs to further probe into.
The invention discloses a kind of prestressed concrete beam anchor lower prestress and section Vertical Temperature Gradient test macro and
Method provides a kind of test method for measurement beam body section temperature influence lower stretching force changing rule research of casting anchor；The present invention
Described steel strand wires anchor lower prestress and section temperature difference test method are easy, and fast, test data is accurate, to constructing
Journey influence is smaller, and damage will not be generated to beam body itself.This kind of test macro can realize beam body prestressing force and temperature gradient
Long-range long-term observation is synchronized, is not limited by construction site.The system is to effective prestress and the vertical temperature in section under research anchor
Gradient provides important evidence, subsequent further to carry out the research that temperature influences anchor lower prestress under varying environment area, with
The tension construction technology for instructing varying environment area effectively improves tensioning construction quality.
Embodiment 1
In a kind of typical test macro provided by the invention, as shown in Figure 1, being broadly divided into three parts in the present invention: the
A part is test device, mainly there is temperature sensor 6 and pressure sensor 5, is mainly used to the temperature number of test acquisition beam body
The data of stretching force accordingly and under anchor；Second part is acquisition device, mainly by automatization test system 8, solar panels 9, certainly
Automatic collection frequency is such as arranged by setting acquisition parameter in dynamicization test macro, realizes automation collection.Solar panels 9 are certainly
Dynamicization acquisition system 8 provides power supply, realizes long term monitoring；Part III is data read portion, is mainly made of computer, from
Dynamicization test macro will acquire data remote transmission into computer by wireless signal transmitting and receiving device 10, and computer is logical
It crosses corresponding embedded software and carries out teledata reading.
The temperature sensor 6 of above-mentioned first part, is mounted on the framework of steel reinforcement of beam body, the temperature sensor
It is bound between framework of steel reinforcement using iron tied silk, is then uniformly applied to sensor external with by sealant；To its carry out
Sealing.Further, temperature sensor can also be using being sealed, as long as guaranteeing it in concrete perfusion and vibration otherwise
When smashing concrete, because external force makes temperature sensor fall off or damage.
Further, the arrangement of temperature sensor be in beam body cross-sectional height direction equidistant placement in beam body
Portion；And along the longitudinal direction of beam body, temperature sensor is arranged on multiple cross sections of beam body, can carry out the temperature in multiple sections
Spend the test of gradient；The specific installation number of temperature sensor can be configured according to the height and length of beam body.
The punching pressure sensor 5 of above-mentioned first part, which is placed on, to be extended on the steel strand wires outside beam body, and is located at
Between work anchor and beam body, for measuring the numerical value of anchor lower prestress；Between the punching pressure sensor 5 and beam body,
And billet is placed between punching pressure sensor and work anchor；Guarantee pressure sensor front and back contact surface and beam body, anchor
Tool uniformly contact, it is ensured that the accuracy of anchor lower prestress test data.
Communication modes between above-mentioned automatization test system and computer can choose wire transmission, also can choose
Wireless transmission, wire transmission are transmitted using cable, and wireless transmission is transmitted using wireless communication module, and automation is surveyed
After test system and computer are attached, parameter setting then is carried out to automatic collecting system, realizes synchronous acquisition.
Further, the power supply of above-mentioned automatic collecting system 8 is powered preferably through solar panels 9, reaches long
The function of phase test；It is understandable, in the case where not needing to test for a long time, can be carried out using the existing power supply such as battery
Power supply.
Embodiment 2
In conjunction with example, construction method of the invention is described in more detail, specific implementation step is as follows:
Step 1, as shown in Fig. 2, after beam body tie with reinforcing bar, along depth of section direction on the framework of steel reinforcement of beam body
Equidistant binding temperature sensor 6；Temperature sensor is bound on reinforcing bar first with iron tied silk, it is then that sealant is uniform
It is applied to sensor external, then sealant is stood to its hardening, to prevent in concrete perfusion and vibrated concrete, because outer
Power makes temperature sensor fall off or damage, and should be noted that the arrangement for guaranteeing the ipsilateral temperature sensor of beam body along section height when binding
Degree direction spacing is consistent.
Step 2, as shown in figure 3, punching pressure sensor 5 is mounted between beam body 11 and work anchor 4, to guarantee to wear
5 contact surface uniform stressed of core type pressure sensor places billet 2 in its rear and front end respectively, is subsequently mounted work anchor 4, limit
Position plate 3, stretch-draw jack 1.As shown in figure 4, pressure sensor answers 5 as symmetrical distribution, guarantee test data it is representative,
Integrality.
Step 3, the transmission line of temperature sensor 6 and punching pressure sensor 5 is connected to automatic collecting system 8
On acquisition channel, it should be noted that the transmission line of unlike signal should be connected with corresponding channel when connecting transmission line, it is ensured that data
It can be with normal acquisition；After the completion of temperature sensor, pressure sensor and automatic collecting system connection, by automatic collecting system
8 realize wireless transmission function by wireless signal transmitting and receiving device 10 with computer 7, realize automatic collecting system and meter
The remote control to automatic collecting system is realized in the long-range connection of calculation machine.
Step 4, to automatic collecting system remote control, carries out parameter setting to automatic collecting system by computer,
Data acquiring frequency, such as the data of acquisition in 10 minutes are set.After the completion of parameter setting, start to carry out stretching construction work and number
It works according to long-term automatic collection.
It can be seen from the above description that above-mentioned example of the invention realizes following technical effect:
Steel strand wires anchor lower prestress and section temperature difference test method described in the invention is easy, fast, tests number
According to accurate, realization anchor lower prestress and section vertical temperature smaller on work progress operation and the influence of beam body structural behaviour itself
Gradient wireless synchronization collecting test.In addition, automatic collecting system long-term work can be made in such a way that solar panels are powered,
Realize long-term data test.The function of computer remote operation and reading data is realized by wireless signal transmitting and receiving device
Can, accurately obtain environment temperature and influence of the beam body section temperature difference to anchor lower prestress, the system is to effective under research anchor
Prestressing force and section Vertical Temperature Gradient provide important evidence, and the subsequent temperature that can further carry out under varying environment area is under anchor
The research that prestressing force influences effectively improves tensioning construction quality to instruct the tension construction technology in varying environment area.
The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention.
A variety of modifications of embodiment will be readily apparent to those skilled in the art, it is as defined herein general
Principle can be realized in other embodiments without departing from the spirit or scope of the present invention, not be described in detail
The part presented with partial enlargement is the prior art, herein without repeating.Therefore, the present invention is not intended to be limited to herein
Shown in these embodiments, and be to fit to the widest scope consistent with principles disclosed herein and feature.
Claims (10)
1. the system of prestressed concrete beam temperature gradient identification effective prestress, which is characterized in that passed including punching pressure
Sensor, temperature sensor, automatic test acquisition system and computer；
The punching pressure sensor, is placed on and extends on the steel strand wires outside beam body, and be located at work anchor and beam body it
Between, for measuring the numerical value of anchor lower prestress；
The temperature sensor, is embedded in prestressed concrete beam, for measuring the concrete of beam body different cross section height
Temperature；
The automatic test acquisition system is connect with the pressure sensor, temperature sensor respectively, and to the temperature of beam body
Degree carries out automatic synchronization acquisition with pressure, then carries out long-range reading data by the built-in computer software.
2. the system of prestressed concrete beam temperature gradient identification effective prestress as described in claim 1, which is characterized in that
The automatic test acquisition system is emitted by wireless signal, wireless signal receiver is led to the computer
Letter.
3. the system of prestressed concrete beam temperature gradient identification effective prestress as described in claim 1, which is characterized in that
The temperature sensor includes multiple, depth of section equidistant placement of multiple temperature sensors according to beam body, disposed at equal distance
Guarantee according to the data of measurement it can be concluded that temperature gradient with depth of section variation, if not by the equidistant cloth of temperature sensor
It sets, it is unified not to can guarantee variable, therefore cannot obtain the relationship of temperature gradient and depth of section.
4. the system of prestressed concrete beam temperature gradient identification effective prestress as described in claim 1, which is characterized in that
Billet is placed between the punching pressure sensor and beam body and between punching pressure sensor and work anchor,
It is accurate effective prestress value that pressure sensor is placed in the anchor lower prestress for guaranteeing to measure under anchor.
5. the system of prestressed concrete beam temperature gradient identification effective prestress as described in claim 1, which is characterized in that
The automatic test acquisition system is powered by solar energy circuit board.
6. a kind of test method of prestressed concrete beam temperature gradient identification effective prestress, which is characterized in that including as follows
Step:
(1) mounting temperature sensor
After main beam structure tie with reinforcing bar, temperature sensing is laid along depth of section direction in beam body two sides web reinforcement
Then device is protected with to temperature sensor；
(2) pressure sensor is installed
After the completion of steel stranded wire penetrating adapter, it is symmetrically installed pressure sensor in steel strand wires test position, stretching construction is crossed Cheng Qian and will be worn
Core type pressure sensor is placed between work anchor and beam body, and billet is placed in sensor two sides, guarantees sensor contact
Uniform force is subsequently mounted limit plate, jack and work anchor；
(3) automatization test system is connected: after the completion of pressure sensor and embedded temperature sensor, by itself and automatic test
System is attached, and then communicates automatization test system and computer, is carried out parameter to automatic collecting system and is set
It sets, realizes synchronous acquisition；
(4) after being installed using automation tensioning equipment start to carry out graduation tensioning, and start carry out anchor lower prestress with
The long-term test job of beam body section temperature difference data.
7. a kind of test method of prestressed concrete beam temperature gradient identification effective prestress as claimed in claim 6,
It is characterized in that, temperature sensor described in the step (1) is mounted on the framework of steel reinforcement of beam body, the temperature sensor
It is bound between framework of steel reinforcement using iron tied silk, is then uniformly applied to sensor external with by sealant.
8. a kind of test method of prestressed concrete beam temperature gradient identification effective prestress as claimed in claim 6,
It is characterized in that, temperature sensor is in beam body cross-sectional height direction equidistant placement inside beam body in the step (1)；And along
The longitudinal direction of beam body arranges temperature sensor on multiple cross sections of beam body.
9. a kind of test method of prestressed concrete beam temperature gradient identification effective prestress as claimed in claim 6,
It is characterized in that, according to the difference of the height in beam body section, the installation number of temperature sensor is increased or decreased.
10. a kind of test method of prestressed concrete beam temperature gradient identification effective prestress as claimed in claim 6,
Be characterized in that, the automatization test system described in step (3) using too can plate power supply mode, set by wireless signal transmission
It is standby, it is communicated with remotely located computer.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910372457.8A CN110132349B (en) | 2019-05-06 | 2019-05-06 | System and method for identifying effective prestress of prestressed concrete beam through temperature gradient |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910372457.8A CN110132349B (en) | 2019-05-06 | 2019-05-06 | System and method for identifying effective prestress of prestressed concrete beam through temperature gradient |
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| CN110132349A true CN110132349A (en) | 2019-08-16 |
| CN110132349B CN110132349B (en) | 2021-11-23 |
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| CN110132349B (en) | 2021-11-23 |
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