CN110132349B - System and method for identifying effective prestress of prestressed concrete beam through temperature gradient - Google Patents
System and method for identifying effective prestress of prestressed concrete beam through temperature gradient Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 35
- 239000011513 prestressed concrete Substances 0.000 title claims abstract description 20
- 238000012360 testing method Methods 0.000 claims abstract description 62
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 33
- 239000010959 steel Substances 0.000 claims abstract description 33
- 239000004567 concrete Substances 0.000 claims abstract description 7
- 238000010276 construction Methods 0.000 claims description 24
- 230000007774 longterm Effects 0.000 claims description 11
- 230000002787 reinforcement Effects 0.000 claims description 10
- 239000000565 sealant Substances 0.000 claims description 6
- 230000001360 synchronised effect Effects 0.000 claims description 6
- 238000009434 installation Methods 0.000 claims description 5
- 238000004891 communication Methods 0.000 claims description 3
- 230000003247 decreasing effect Effects 0.000 claims description 3
- 230000008054 signal transmission Effects 0.000 claims description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims 2
- 229910052742 iron Inorganic materials 0.000 claims 1
- 230000005540 biological transmission Effects 0.000 description 11
- 238000011160 research Methods 0.000 description 11
- 230000007613 environmental effect Effects 0.000 description 9
- 102000008133 Iron-Binding Proteins Human genes 0.000 description 4
- 108010035210 Iron-Binding Proteins Proteins 0.000 description 4
- 238000011161 development Methods 0.000 description 2
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 1
- 238000004873 anchoring Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000036760 body temperature Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects 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
- 230000002277 temperature effect Effects 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
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- 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
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- 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
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Abstract
The invention discloses a system and a method for identifying effective prestress by temperature gradient of a prestressed concrete beam, which comprises a feed-through pressure sensor, a temperature sensor, an automatic test acquisition system and a computer; the feed-through pressure sensor is arranged on a steel strand extending out of the beam body, is positioned between the working anchor and the beam body, and is used for measuring the numerical value of the prestress under the anchor; the temperature sensor is pre-embedded in the prestressed concrete beam and used for measuring the concrete temperatures of different cross-section heights of the beam body; the automatic test acquisition system is respectively connected with the pressure sensor and the temperature sensor, automatically and synchronously acquires the temperature and the pressure of the beam body, and then remotely reads data through the built-in software of the computer.
Description
Technical Field
The invention relates to a system and a method for identifying effective prestress of a prestressed concrete beam through temperature gradient.
Background
The statements herein merely provide background information related to the present disclosure and may not necessarily constitute prior art.
Under the drive of rapid development of domestic economy, bridge construction also enters a rapid development stage. The prestressed concrete bridge structure is widely popularized in the field of highway and railway bridge construction due to good service performance and superior crossing capacity. As prestressed bridges have been developed, various problems have been discovered. According to research, the prestressed bridge continuously attenuates the mechanical property of the member under the influence of natural factors such as climate, environment and the like. The temperature effect is a key influence factor on the prestress, the thermal expansion stress of the prestressed steel strand under different temperature levels can change, and the influence on the effective prestress under the anchor is larger when the temperature gradient changes greatly. For some beam bodies with higher cross-sectional height and longer longitudinal prestressed steel beam length, the influence of temperature change on the prestress is not insignificant.
The inventor finds that the research on the prestress change rule under the action of the temperature gradient of the section of the beam body is blank at present and needs to be further researched.
Disclosure of Invention
In order to solve the problems in the prior art, the invention discloses a system and a method for testing the temperature gradient of the prestress and the vertical cross section of a prestressed concrete beam anchor, and provides a testing method for researching the change of the tension force under the anchor under the influence of the cross section temperature of a beam body. The method for testing the prestress and section temperature gradient under the steel strand anchor is simple, convenient and quick, has accurate test data, has small influence on the construction process, and cannot damage the beam body. The test system can realize synchronous remote long-term observation of the prestress and the temperature gradient of the beam body and is not limited by a construction site. The system provides an important basis for researching the regular relation degree of the effective prestress under the anchor and the vertical temperature gradient of the cross section, and can further research the influence of the temperature under different environmental areas on the prestress under the anchor subsequently so as to guide the tensioning construction process of different environmental areas and effectively improve the prestress tensioning construction quality.
The invention aims to provide a system for testing the prestress and the vertical temperature gradient of a cross section of a prestressed concrete beam under an anchor, which can be applied to the research on the influence of the beam body temperature on the prestress under the anchor in different environmental regions so as to guide the tensioning construction process under the climatic conditions in different regions and effectively improve the prestress tensioning construction quality.
In order to achieve the first object, the present invention adopts the following technical means:
a system for testing the vertical temperature gradient of the prestress and the cross section under a prestressed concrete beam anchor comprises a feed-through pressure sensor, a temperature sensor, an automatic test acquisition system and a computer;
the straight-through pressure sensor is arranged on a steel strand (a beam body steel strand anchoring end) extending out of the beam body, is positioned between the working anchor and the beam body, and is used for measuring the numerical value of the prestress under the anchor;
the temperature sensor is pre-embedded in the prestressed concrete beam and is used for measuring the concrete temperature of different section heights of the beam body;
the automatic test acquisition system is respectively connected with the pressure sensor and the temperature sensor, automatically and synchronously acquires the temperature and the pressure of the beam body, and then remotely reads data through the software arranged in the computer.
The invention also provides a method for testing the prestress and cross-section vertical temperature gradient under the prestressed concrete beam anchor, which comprises the following specific operation steps:
(1) installing a temperature sensor: after the main beam structure steel reinforcement framework is bound, the web steel reinforcements on two sides of the beam body are bound by using iron binding wires along the height direction of the cross section. According to the height of the cross section of the beam body, the temperature sensors are arranged at equal intervals and can be increased or decreased appropriately;
(2) installing a pressure sensor: after the steel strand is threaded, a pressure sensor is installed below a working anchor, the feed-through pressure sensor is placed between the working anchor and a beam body before the tensioning construction process, steel base plates are placed on two sides of the sensor, the uniform stress of a contact surface of the sensor is guaranteed, and then a limiting plate, a jack and a tool anchor are installed;
(3) connecting an automatic test system: after the pressure sensors are installed and the temperature sensors are embedded at equal intervals along the height of the cross section, the pressure sensors are connected with an automatic testing system, then the automatic testing system is connected with a computer through network cables or wireless transmission, and then the automatic acquisition system is subjected to parameter setting to realize synchronous acquisition;
(4) and after the installation is finished, tensioning construction is started, grading tensioning is started by utilizing intelligent tensioning, and long-term test work of the prestress under the anchor and the temperature gradient data of the section of the beam body is started.
Furthermore, in the method, the temperature sensor in the step (1) is arranged on a steel reinforcement framework of the beam body, the temperature sensor and the steel reinforcement framework are bound by adopting iron binding wires, and then sealant is uniformly coated outside the sensor so as to prevent the temperature sensor from falling off when concrete is poured and vibrated.
Further, in the method, the temperature sensors in the step (1) are equidistantly arranged inside the beam body along the height of the cross section of the beam body, the number of the temperature sensors installed according to the height of the cross section of the beam body can be increased or decreased appropriately, and in addition, the temperature gradient of a plurality of cross sections can be tested along the longitudinal direction of the beam body.
Furthermore, in the method, steel backing plates are respectively arranged between the feed-through pressure sensor and the beam body and between the pressure sensor and the working anchorage device in the step (2), so that the front contact surface and the rear contact surface of the pressure sensor are ensured to be uniformly contacted with the beam body and the anchorage device, and the accuracy of the prestress test data under the anchorage is ensured.
Furthermore, in the method, the automatic test system in the step (3) adopts a solar panel power supply mode, so that the automatic test system can work for a long time without an external power supply. Through wireless signal transmission equipment, realize unmanned on duty remote signal control, reach the purpose of long-term data test.
Compared with the prior art, the invention has the beneficial effects that:
the method for testing the prestress and the section temperature gradient under the anchor is simple, convenient and quick, has accurate test data, has small influence on the construction process, and cannot damage the beam body. The testing system and the testing method can realize long-term remote observation of the prestress and the temperature gradient of the beam body and are not limited by a construction site.
The test method and the test system provide important scientific research basis for researching the effective prestress under the anchor and the vertical temperature gradient of the cross section, and the subsequent research on the influence of the temperature under different environmental areas on the prestress under the anchor can be further developed so as to guide the tensioning construction process of different environmental areas and effectively improve the prestress tensioning construction quality.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
FIG. 1 is a schematic diagram of the overall connection of a test system;
FIG. 2 is a schematic view of a temperature sensor being buried;
FIG. 3 is a cross-sectional elevation view of the beam body;
FIG. 4 is a drawing of a cross-core pressure sensor installation and tensioning process;
in the figure: 1 is a jack; 2 is a steel backing plate; a limiting plate 3; 4 is a working anchor; 5 is a feed-through pressure sensor; 6 is a temperature sensor; 7 is a computer; 8, an automatic test system; 9 is a solar panel; 10 is a wireless signal transmitting and receiving device; 11 is a beam body; 12 is a prestressed strand.
Detailed Description
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
As introduced in the background art, research shows that the prestressed bridge continuously attenuates the mechanical properties of components under the influence of natural factors such as climate, environment and the like, and for some beam bodies with higher section height and longer longitudinal prestressed steel beam length, the influence of temperature change on the prestress is not small and great. The inventor finds that the research on the prestress change rule under the action of the temperature gradient of the section of the beam body is blank at present and needs to be further researched.
The invention discloses a system and a method for testing the temperature gradient of the prestress and the vertical cross section of a prestressed concrete beam under an anchor, and provides a testing method for the research of the change rule of the tension force under the influence of the temperature of the cross section of a beam body under the anchor; the method for testing the prestress and section temperature gradient under the steel strand anchor is simple, convenient and quick, has accurate test data, has small influence on the construction process, and cannot damage the beam body. The test system can realize synchronous remote long-term observation of the prestress and the temperature gradient of the beam body and is not limited by a construction site. The system provides an important basis for researching the effective prestress under the anchor and the vertical temperature gradient of the cross section, and can further research the influence of the temperature under different environmental areas on the prestress under the anchor subsequently so as to guide the tensioning construction process in different environmental areas and effectively improve the prestress tensioning construction quality.
Example 1
In a typical test system provided by the present invention, as shown in fig. 1, the present invention is mainly divided into three parts: the first part is a testing device which mainly comprises a temperature sensor 6 and a pressure sensor 5 and is mainly used for testing and acquiring temperature data of a beam body and data of tension force under an anchor; the second part is an acquisition device, mainly composed of an automatic test system 8 and a solar panel 9, wherein the automatic test system realizes automatic acquisition by setting acquisition parameters, such as automatic acquisition frequency. The solar panel 9 provides a power supply for the automatic acquisition system 8 to realize long-term monitoring; the third part is a data reading part and mainly comprises a computer, the automatic test system remotely transmits the acquired data to the computer through the wireless signal transmitting and receiving device 10, and the computer remotely reads the data through corresponding built-in software.
The temperature sensor 6 of the first part is arranged on a steel bar framework of the beam body, the temperature sensor and the steel bar framework are bound by adopting an iron binding wire, and then sealant is uniformly coated outside the sensor; it is sealed. Furthermore, the temperature sensor can be sealed in other modes, and the temperature sensor can be ensured to fall off or be damaged due to external force when concrete is poured or vibrated.
Furthermore, the temperature sensors are arranged in the beam body at equal intervals in the height direction of the cross section of the beam body; temperature sensors are arranged on a plurality of cross sections of the beam body along the longitudinal direction of the beam body, so that the temperature gradient of the plurality of cross sections can be tested; the specific installation number of the temperature sensors can be set according to the height and the length of the beam body.
The straight-through pressure sensor 5 of the first part is placed on a steel strand extending out of the beam body, is positioned between the working anchor and the beam body, and is used for measuring the numerical value of the prestress under the anchor; steel base plates are arranged between the straight-through pressure sensor 5 and the beam body and between the straight-through pressure sensor and the working anchor; the front contact surface and the rear contact surface of the pressure sensor are ensured to be uniformly contacted with the beam body and the anchorage device, and the accuracy of the prestress test data under the anchorage is ensured.
The communication mode between the automatic test system and the computer can select wired transmission or wireless transmission, the wired transmission adopts a network cable for transmission, the wireless transmission adopts a wireless communication module for transmission, and after the automatic test system is connected with the computer, the automatic acquisition system is subjected to parameter setting to realize synchronous acquisition.
Further, the power supply of the automatic acquisition system 8 is preferably supplied through a solar panel 9, so that the long-term test function is achieved; it will be appreciated that existing power supplies, such as batteries, may be used to supply power without the need for long-term testing.
Example 2
The construction method of the invention is further explained in detail by combining with the examples, and the concrete implementation steps are as follows:
And 2, as shown in fig. 3, installing the feed-through pressure sensor 5 between the beam body 11 and the working anchor 4, respectively placing steel backing plates 2 at the front end and the rear end of the feed-through pressure sensor 5 in order to ensure that the contact surface of the feed-through pressure sensor 5 is uniformly stressed, and then installing the working anchor 4, the limiting plate 3 and the tensioning jack 1. As shown in fig. 4, the pressure sensors 5 should be distributed symmetrically to ensure the test data is representative and complete.
And 4, remotely controlling the automatic acquisition system through a computer, setting parameters of the automatic acquisition system, and setting data acquisition frequency, such as acquiring data once in 10 minutes. And after the parameter setting is finished, starting the tensioning construction work and the long-term automatic data acquisition work.
From the above description, it can be seen that the above-described examples of the present invention achieve the following technical effects:
the method for testing the temperature gradient of the prestress and the cross section under the steel strand anchor is simple, convenient and quick, has accurate test data, has small influence on the operation of the construction process and the structural performance of a beam body, and realizes wireless synchronous acquisition and test of the prestress and the vertical temperature gradient of the cross section under the anchor. In addition, the automatic acquisition system can work for a long time in a solar panel power supply mode, and long-term data testing is realized. The system provides an important basis for researching the effective prestress under the anchor and the vertical temperature gradient of the cross section, and can further research the influence of the temperature under different environmental areas on the prestress under the anchor, so as to guide the tensioning construction process of different environmental areas and effectively improve the prestress tensioning construction quality.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to the embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention, the parts not specifically described or shown being exaggerated for clarity of presentation and for clarity of illustration in the prior art and not in any greater detail herein. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and features disclosed herein.
Claims (8)
1. The system for identifying the effective prestress of the prestressed concrete beam through the temperature gradient is characterized by comprising a feed-through pressure sensor, a temperature sensor, an automatic test acquisition system and a computer;
the straight-through pressure sensor is arranged on a steel strand extending out of the beam body, is positioned between the working anchor and the beam body, and is used for measuring the numerical value of the prestress under the anchor; steel base plates are arranged between the through pressure sensor and the beam body and between the through pressure sensor and the working anchor; the feed-through pressure sensors are symmetrically distributed;
the temperature sensors are pre-embedded in the prestressed concrete beam and used for measuring the concrete temperatures of different cross section heights of the beam body, the temperature sensors comprise a plurality of temperature sensors, and the temperature sensors are arranged at equal intervals according to the cross section heights of the beam body; the equidistant arrangement ensures that the change of the temperature gradient along with the height of the section can be obtained according to the measured data; if the temperature sensors are not arranged at equal intervals, the uniformity of variables cannot be guaranteed, so that the relation between the temperature gradient and the section height cannot be obtained;
the automatic test acquisition system is respectively connected with the through pressure sensor and the temperature sensor, automatically and synchronously acquires the temperature and the pressure of the beam body, remotely reads data through built-in software of the computer, and communicates with the computer through a wireless signal transmitting device and a wireless signal receiving device.
2. The system for identifying effective prestress according to claim 1, wherein the pressure sensor is placed under the anchor to ensure that the measured prestress under the anchor is an accurate effective prestress value.
3. The system for identifying effective prestress based on temperature gradient of prestressed concrete girder according to claim 1, wherein said automatic test collection system is powered by solar circuit board.
4. The method for testing a system for identifying an effective prestress based on a temperature gradient of a prestressed concrete girder according to claim 1, comprising the steps of:
(1) mounting temperature sensor
After the main beam structure steel reinforcement framework is bound, temperature sensors are distributed on web plate steel reinforcements on two sides of a beam body along the height direction of the cross section, then the temperature sensors are protected, and the temperature sensors are equidistantly arranged in the beam body in the height direction of the cross section of the beam body;
(2) installation feed-through pressure sensor
After the steel strand is threaded, symmetrically mounting a feed-through pressure sensor at a steel strand testing position, placing the feed-through pressure sensor between a working anchor and a beam body before a tensioning construction process, placing steel backing plates on two sides of the sensor to ensure that the contact surface of the sensor is uniformly stressed, and then mounting a limiting plate, a jack and the working anchor;
(3) connecting an automatic test system: after the through pressure sensor and the temperature sensor are embedded, the through pressure sensor and the temperature sensor are connected with an automatic testing system, then the automatic testing system is communicated with a computer, and the automatic acquisition system is subjected to parameter setting to realize synchronous acquisition;
(4) after the installation is finished, the automatic tensioning equipment is used for starting graded tensioning, and long-term test work of the prestress under the anchor and the temperature gradient data of the beam body section is started.
5. The method for testing a system for identifying effective prestress according to temperature gradient of prestressed concrete beam recited in claim 4, wherein said temperature sensor in said step (1) is installed on a steel reinforcement frame of the beam body, said temperature sensor and the steel reinforcement frame are bound by using iron tie wire, and then the sealant is uniformly applied to the outside of the sensor.
6. The method for testing a system for identifying effective prestress according to temperature gradient of prestressed concrete girder of claim 4, wherein the temperature sensors are arranged on a plurality of cross sections of the girder in the longitudinal direction of the girder in the step (1).
7. The method for testing a system for recognizing effective prestress according to temperature gradient of prestressed concrete girder of claim 4, wherein the number of installed temperature sensors is increased or decreased according to the difference of height of section of the girder.
8. The method for testing a system for identifying effective prestress according to temperature gradient of prestressed concrete girder of claim 4, wherein said automated testing system in step (3) is in communication with a computer located at a remote place through a wireless signal transmission device by using a solar panel power supply method.
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1840782A (en) * | 2005-12-12 | 2006-10-04 | 中铁大桥局股份有限公司 | Construction process for controlling crack of prestressed concrete beam by low strength pre-stressed method |
| CN202599578U (en) * | 2012-04-10 | 2012-12-12 | 交通运输部公路科学研究所 | Device for measuring effective stress level of vertical prestressed reinforcing steel bar |
| JP5849068B2 (en) * | 2013-06-05 | 2016-01-27 | 飛島建設株式会社 | Tension management method |
| CN105319238A (en) * | 2015-11-16 | 2016-02-10 | 长安大学 | Infrared heating testing device and testing method for bituminous pavement |
| CN106436576A (en) * | 2016-08-24 | 2017-02-22 | 广西长长路桥建设有限公司 | Constructing method of main tower of cable-stayed bridge through circumferential prestressing force |
| CN107024308A (en) * | 2016-10-28 | 2017-08-08 | 山东大学 | A kind of method of testing of intermediate plate anchorage snap-in force |
| CN109299498A (en) * | 2018-08-07 | 2019-02-01 | 山东大学 | The modified method of discrimination of Pulling escape testing result time and temperature effect and system |
-
2019
- 2019-05-06 CN CN201910372457.8A patent/CN110132349B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1840782A (en) * | 2005-12-12 | 2006-10-04 | 中铁大桥局股份有限公司 | Construction process for controlling crack of prestressed concrete beam by low strength pre-stressed method |
| CN202599578U (en) * | 2012-04-10 | 2012-12-12 | 交通运输部公路科学研究所 | Device for measuring effective stress level of vertical prestressed reinforcing steel bar |
| JP5849068B2 (en) * | 2013-06-05 | 2016-01-27 | 飛島建設株式会社 | Tension management method |
| CN105319238A (en) * | 2015-11-16 | 2016-02-10 | 长安大学 | Infrared heating testing device and testing method for bituminous pavement |
| CN106436576A (en) * | 2016-08-24 | 2017-02-22 | 广西长长路桥建设有限公司 | Constructing method of main tower of cable-stayed bridge through circumferential prestressing force |
| CN107024308A (en) * | 2016-10-28 | 2017-08-08 | 山东大学 | A kind of method of testing of intermediate plate anchorage snap-in force |
| CN109299498A (en) * | 2018-08-07 | 2019-02-01 | 山东大学 | The modified method of discrimination of Pulling escape testing result time and temperature effect and system |
Non-Patent Citations (1)
| Title |
|---|
| 波形钢腹板箱梁顶板横向温度应力分析;姚晨 等;《山东交通学院学报》;20161231;第24卷(第4期);第58-63页 * |
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