CN111665137A - Highway single-beam static load test system - Google Patents
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Abstract
The invention relates to the technical field of test systems, in particular to a single-beam static load test system for a highway, wherein the static load test loading system is arranged on the upper side of a beam to be tested, a computer control system is in signal connection with the static load test loading system and is used for controlling the static load test loading system to provide downward loading force for the beam to be tested, a load data acquisition system is connected with the static load test loading system and is used for measuring the load provided by the static load test loading system for the beam to be tested, a strain data acquisition system is arranged on the surface of the beam to be tested and is used for detecting strain data of the beam to be tested, a displacement data acquisition system is arranged on the lower side of the beam to be tested and is used for measuring the displacement of the beam to be tested, and the computer control system is in signal connection with the displacement data acquisition system, the strain data acquisition system, and the computer control system generates a single-beam static load test report according to the parameters of the beam to be tested by combining the displacement data, the strain data and the load data.
Description
Technical Field
The invention relates to the technical field of test systems, in particular to a highway single-beam static load test system.
Background
In the construction of a highway bridge with a single-span of less than 40m, a precast slab beam, a box beam or a T-beam bridge occupies a considerable proportion, after the prefabrication of a beam-making field is completed, a part of precast beams are randomly selected to carry out a single-beam static load test to test the bearing capacity of the precast beams, main test parameters comprise the strain and deflection of the control section of the beams, a loading mode is a heavy object stacking load, other beams of the beam field are selected as a weight beam for loading, and a load sensor or a hydraulic jack is used for controlling the magnitude of the loading force.
The traditional single-beam static load test method is characterized in that the loading force is manually controlled, manual reading of a mechanical dial indicator is adopted in deflection test or a bridge type displacement sensor is connected into a static data acquisition instrument to acquire reading under manual control, and a resistance strain gauge is connected into the static data acquisition instrument to acquire reading under manual control in strain test. Under the traditional mode, the loading capacity of the static load test needs to be calculated in advance, and the field loading program is manually controlled, so that the efficiency is low, more personnel needs to be invested, and the standardization of the static load test process is not facilitated.
Disclosure of Invention
The invention aims to provide a single-beam static load test system for a highway, which solves the problems of low efficiency, more required input personnel and larger error caused by a traditional single-beam static load test method.
In order to solve the technical problems, the invention adopts the following technical scheme:
a road single-beam static load test system comprises a computer control system, a displacement data acquisition system, a strain data acquisition system, a load data acquisition system and a static load test loading system;
the computer control system is in signal connection with the static load test loading system and is used for controlling the static load test loading system to provide downward loading force for the beam to be tested;
the load data acquisition system is connected with the static load test loading system and is used for measuring the load provided by the static load test loading system to the beam to be measured;
the strain data acquisition system is arranged on the bottom surface and the side surface of the beam to be detected and used for detecting strain data of the beam to be detected;
the displacement data acquisition system is arranged on the lower side of the beam to be measured and used for measuring the displacement of the beam to be measured;
the computer control system is in signal connection with the displacement data acquisition system, the strain data acquisition system and the load data acquisition system and is used for receiving and storing the displacement data, the strain data and the load data;
and the computer control system generates a single-beam static load test report according to the parameters of the beam to be tested by combining displacement data, strain data and load data.
The system further comprises a static load data acquisition instrument which is in signal connection with the displacement data acquisition system, the strain data acquisition system and the load data acquisition system and is used for receiving the displacement data, the strain data and the load data;
the static load data acquisition instrument is in signal connection with the computer control system and is used for transmitting the received displacement data, strain data and load data to the computer control system in real time.
The computer control system comprises a scheme compiling module, a loading control module, a data storage module, a data analysis module and a result reporting module;
the scheme compiling module calculates a test load value meeting the loading efficiency and theoretical values of static deflection and strain under test load according to design parameters of the beam to be tested;
the loading control module is in signal connection with the static load test loading system and is used for controlling the starting, stopping and loading rate of the static load test loading system;
the data storage module is used for receiving and storing displacement data, strain data and load data, and displaying the received data on a display interface in a numerical value or curve graph mode;
and the data analysis module compares the detected displacement data and the strain data with theoretical values, calculates a check coefficient, and calculates the deflection and the relative residual of the strain after unloading.
The technical scheme is that the static load test loading system comprises a variable frequency motor controller and a jack, wherein the jack is arranged at the top of a beam to be tested, a cross load beam is arranged at the upper end of the jack, and a pressure beam is arranged on the upper side of the cross load beam;
the variable frequency motor controller is in signal connection with the jack and is used for controlling the starting, stopping and loading rate of the jack;
and the variable frequency motor controller is in signal connection with the loading control module.
According to a further technical scheme, the load data acquisition system is a bridge type loading force sensor, and the bridge type loading force sensor is arranged between the jack and the cross arm beam.
According to a further technical scheme, the displacement data acquisition system comprises ten bridge type displacement meters, two bridge type displacement meters are arranged on the sections of the left side and the right side of the beam to be measured, and two bridge type displacement meters are arranged on the quarter length section, the half length section and the three-quarter length section of the beam to be measured.
According to a further technical scheme, the data analysis module draws the left and right sides or the average value of the beam to be measured according to the displacement measured values, compares the deflection line with the deflection line of a theoretical value, draws a load-displacement curve according to the measured values of the measured points, and analyzes the linearity of the curve.
According to a further technical scheme, the strain data acquisition system comprises ten resistance strain gauges, the ten resistance strain gauges form ten strain measurement points on the midspan section of the beam to be measured, the bottom plate of the beam to be measured is provided with two strain measurement points, the flange plates on two sides of the beam to be measured are provided with one strain measurement point, and the web plates on two sides of the beam to be measured are provided with one strain measurement point at the quarter height, the half height and the three-quarter height.
According to a further technical scheme, the data analysis module draws a strain-beam height relation curve according to the measured strain values, analyzes the distribution condition of the strain on the test section of the beam to be tested, and simultaneously draws a load-strain curve according to the measured values of the measuring points, and analyzes the linearity of the curve.
A further technical scheme is that the loading control module comprises an automatic loading mode and a manual loading mode, the automatic loading mode adopts single-cycle loading, and the single-cycle loading comprises: 0% -25% of load-50% of load-75% of load-100% of load-50% of load-0% of load.
Compared with the prior art, the invention has the beneficial effects that: the computer control system controls the start, stop and loading rate of the static load test loading system, then the displacement data acquisition system, the strain data acquisition system and the load data acquisition system are used for receiving real-time displacement data, strain data and load data, and the computer control system is used for generating a test report, so that the loading and test process is automatic and standardized, the test data is more accurate, the labor intensity of testers is reduced, and the personnel investment is reduced.
Drawings
FIG. 1 is a block diagram of a single-beam static load testing system for a road according to the present invention.
Fig. 2 is a floor layout view of the road single-beam static load test system of the invention.
Fig. 3 is a cross-sectional view of section C in fig. 2.
Icon: the method comprises the following steps of 1-a beam to be tested, 2-a ballast beam, 3-a cross beam, 4-a bridge type loading force sensor, 5-a jack, 6-a bridge type displacement meter, 7-a test support, 8-a test pedestal and 9-a hoisting rope.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example (b):
fig. 1-3 show a preferred embodiment of the single-beam static load test system for roads of the present invention, in which the single-beam static load test system for roads in this embodiment specifically includes a computer control system, a displacement data collection system, a strain data collection system, a load data collection system and a static load test loading system, the static load test loading system is disposed on the upper side of the beam 1 to be tested, the computer control system is in signal connection with the static load test loading system and is used for controlling the static load test loading system to provide a downward loading force to the beam 1 to be tested, the load data collection system is connected with the static load test loading system and is used for measuring the load provided by the static load test loading system to the beam 1 to be tested, the strain data collection system is disposed on the bottom and side of the beam 1 to be tested and is used for detecting the strain data of the beam 1 to be tested, the displacement data collection system is disposed on the, the device is used for measuring the displacement of the beam 1 to be measured, the computer control system is in signal connection with the displacement data acquisition system, the strain data acquisition system and the load data acquisition system and is used for receiving and storing displacement data, strain data and load data, and the computer control system generates a single-beam static load test report by combining the displacement data, the strain data and the load data according to the parameters of the beam 1 to be measured.
The computer control system controls the start, stop and loading rate of the static load test loading system, then the displacement data acquisition system, the strain data acquisition system and the load data acquisition system are used for receiving real-time displacement data, strain data and load data, and the computer control system is used for generating a test report, so that the loading and test process is automatic and standardized, the test data is more accurate, the labor intensity of testers is reduced, and the personnel investment is reduced.
The system also comprises a static load data acquisition instrument which is in signal connection with the displacement data acquisition system, the strain data acquisition system and the load data acquisition system and is used for receiving the displacement data, the strain data and the load data, and the static load data acquisition instrument is in signal connection with the computer control system and is used for transmitting the received displacement data, the strain data and the load data to the computer control system in real time.
The static load data acquisition instrument is a multichannel static load data acquisition instrument based on the Wheatstone bridge principle, the displacement data acquisition system, the strain data acquisition system and the load data acquisition system share the static load data acquisition instrument, and signal connection between the static load data acquisition instrument and the displacement data acquisition system, the strain data acquisition system and the load data acquisition system can be realized through the access of a shielding signal wire.
The computer control system comprises a scheme compiling module, a loading control module, a data storage module, a data analysis module and a result reporting module, wherein the scheme compiling module calculates a test load value meeting loading efficiency according to design parameters of the beam 1 to be tested and calculates theoretical values of static deflection and strain under test load, the loading control module is in signal connection with the static load test loading system and is used for controlling starting, stopping and loading rates of the static load test loading system, the data storage module is used for receiving and storing displacement data, strain data and load data and displaying the received data on a display interface in a numerical value or curve graph mode, and the data analysis module compares the detected displacement data and strain data with the theoretical values to calculate a check coefficient and calculates relative residual of deflection and strain after unloading.
The scheme compiling module automatically calculates a theoretical value of a test load meeting the standard requirement loading efficiency and theoretical values of static deflection and strain under the test load according to input design parameters of the beam 1 to be tested, such as design load grade, lane width, bridge span, number of transverse beams, beam spacing, cross-sectional dimension and the like, so as to be convenient for comparison with a later measured value and output a formatted static load test scheme text.
And the loading control module automatically forms a static load test control program according to the static load test scheme and loads according to the program.
The data storage module receives displacement, strain and jack 5 load values of all measuring points collected in the static data collector, displays the displacement, strain and jack 5 load values on a computer display interface in a numerical value or curve graph mode in real time, and can store displacement time course data, load time course data and loading force data in real time.
And the result report module imports related data and icons into a single-beam static load test report template according to the static load test result and the test data analysis result, automatically generates a single-beam static load test report, and improves the scheme compiling efficiency.
The static load test loading system comprises a variable frequency motor controller and a jack 5, wherein the jack 5 is arranged at the top of a beam 1 to be tested, a cross beam 3 is arranged at the upper end of the jack 5, a ballast beam 2 is arranged on the upper side of the cross beam 3, the variable frequency motor controller is in signal connection with the jack 5 and used for controlling the starting and stopping and loading speed of the jack 5, and the variable frequency motor controller is in signal connection with a loading control module. The load data acquisition system is a bridge type loading force sensor 4, and the bridge type loading force sensor 4 is arranged between the jack 5 and the cross arm beam 3.
After the load numerical value of the bridge type loading force sensor 4 is transmitted to the computer control system, the loading control module can control loading start and stop and loading speed through the variable frequency motor controller according to the current load value, wherein the number of the jacks 5 is two, the jacks are symmetrically arranged on the upper side of the beam 1 to be tested, the loading control module can judge the difference value of the jacking force of the two jacks 5, and when exceeding the limit, the loading speed can be controlled through the variable frequency motor controller, and synchronous loading on two sides is kept.
The jacks 5 are all 500kN electric screw jacks, the two jacks 5 are symmetrically arranged above a mid-span web plate of the beam to be tested 1, the upper ends of the jacks 5 are bridge type loading force sensors 4, the upper ends of the bridge type loading force sensors 4 are cross beam beams 3, one ends of the hoisting pressure beams 2 are arranged above the cross beam 3 to provide pressure for static load test loading, as shown in fig. 3, during static load test, the jacks 5 are jacked, the loading load is gradually increased, the process that the self-weight load of the pressure beams 2 is gradually transferred to the beam to be tested 1 is the process, a closed loop is formed by the computer control system, the static load test loading system and the load data acquisition system, and the loading process can be automated and programmed.
The displacement data acquisition system comprises ten bridge type displacement meters 6, two bridge type displacement meters 6 are arranged on the sections on the left side and the right side of the beam 1 to be measured (the sections on the left side and the right side are also fulcrum sections, namely A, E sections in fig. 2), and two bridge type displacement meters 6 are arranged on the quarter length section (namely, section B in fig. 2), the half length section (namely, cross-over section, namely, section C in fig. 2) and the three quarter length section (namely, section D in fig. 2) of the beam 1 to be measured. And the data analysis module draws the left and right sides or the average value of the beam 1 to be measured according to the displacement measured value, compares the deflection line with the deflection line of a theoretical value, draws a load-displacement curve according to the measured value of each measuring point, and analyzes the linearity of the curve.
The strain data acquisition system comprises ten resistance strain gauges, the ten resistance strain gauges form ten strain measurement points on a midspan section of the beam 1 to be measured, and the strain measurement section is a midspan section, so that the ten strain measurement points are respectively distributed in the following mode: the bottom plate of the beam 1 to be measured is provided with two strain measurement points, the flange plates at two sides of the beam 1 to be measured are provided with one strain measurement point, and the quarter height, the half height and the three-quarter height of the webs at two sides of the beam 1 to be measured are provided with one strain measurement point. Wherein height refers to web height. And the data analysis module draws a strain-beam height relation curve according to the measured strain values, analyzes the distribution condition of the strain on the test section of the beam 1 to be tested, draws a load-strain curve according to the measured strain values of the test points, and analyzes the linearity of the curve.
And the data analysis module compares the measured displacement and strain of the midspan C section under 100% load with theoretical values thereof, calculates a check coefficient, calculates the relative residue of the unloaded deflection and strain, and automatically judges whether the check coefficient and the unloaded residue of each measuring point meet the standard requirements. After A, E section fulcrum settlement is deducted from the displacement measured values of the fulcrum section (A, E section), the quarter-length section (B section), the midspan section (C section) and the three-quarter-length section (D section), the deflection line of the left and right sides or the left and right average values of the single beam is drawn and can be compared with the calculated deflection line. And (4) drawing a load-displacement or load-strain curve according to the measured value of the graded loading of each measuring point, and analyzing the linearity of the curve. And drawing a strain-beam height relation curve according to the strain condition of the actually measured midspan section, and analyzing the distribution condition of the strain on the single-beam test section.
The loading control module comprises an automatic loading mode and a manual loading mode, the automatic loading mode adopts single-cycle loading, and the single-cycle loading comprises the following steps: 0% -25% of load-50% of load-75% of load-100% of load-50% of load-0% of load.
The control of the jack 5 in the automatic loading control module can be switched into a manual control mode, so that the single-jack or double-jack manual control of the jack 5 is realized.
In the automatic control mode, default loading and unloading programs and load holding time are automatically provided. The default of the single-cycle loading of the static load test is 4 stages, the unloading is 2 stages, the static load test is required to be repeated for 1 time according to the static load test, namely, the single-cycle loading and unloading are repeated for one time, and the single-cycle loading program is as follows: 0% -25% load holding-50% load holding-75% load holding-100% load holding-50% load holding-0% load holding, the default load holding time is 15min when 100% load is loaded, the rest load stages are 5min, and in addition, the loading and unloading stages and the load holding time of each stage of load can be modified through parameter setting.
Although the invention has been described herein with reference to a number of illustrative embodiments thereof, it should be understood that numerous other modifications and embodiments can be devised by those skilled in the art that will fall within the spirit and scope of the principles of this disclosure. More specifically, various variations and modifications are possible in the component parts and/or arrangements of the subject combination arrangement within the scope of the disclosure, the drawings and the appended claims. In addition to variations and modifications in the component parts and/or arrangements, other uses will also be apparent to those skilled in the art.
Claims (10)
1. The utility model provides a highway monospar static test system which characterized in that: the device comprises a computer control system, a displacement data acquisition system, a strain data acquisition system, a load data acquisition system and a static load test loading system;
the static load test loading system is arranged on the upper side of the beam (1) to be tested, and the computer control system is in signal connection with the static load test loading system and is used for controlling the static load test loading system to provide downward loading force for the beam (1) to be tested;
the load data acquisition system is connected with the static load test loading system and is used for measuring the load provided by the static load test loading system to the beam (1) to be measured;
the strain data acquisition system is arranged on the bottom surface and the side surface of the beam (1) to be detected and is used for detecting strain data of the beam (1) to be detected;
the displacement data acquisition system is arranged on the lower side of the beam (1) to be measured and is used for measuring the displacement of the beam (1) to be measured;
the computer control system is in signal connection with the displacement data acquisition system, the strain data acquisition system and the load data acquisition system and is used for receiving and storing the displacement data, the strain data and the load data;
and the computer control system generates a single-beam static load test report according to the parameters of the beam (1) to be tested by combining displacement data, strain data and load data.
2. The road single beam static load test system of claim 1, wherein: the static load data acquisition instrument is in signal connection with the displacement data acquisition system, the strain data acquisition system and the load data acquisition system and is used for receiving the displacement data, the strain data and the load data;
the static load data acquisition instrument is in signal connection with the computer control system and is used for transmitting the received displacement data, strain data and load data to the computer control system in real time.
3. The road single beam static load test system according to claim 1 or 2, wherein: the computer control system comprises a scheme compiling module, a loading control module, a data storage module, a data analysis module and a result reporting module;
the scheme compiling module calculates a test load value meeting the loading efficiency and theoretical values of static deflection and strain under test load according to design parameters of the beam (1) to be tested;
the loading control module is in signal connection with the static load test loading system and is used for controlling the starting, stopping and loading rate of the static load test loading system;
the data storage module is used for receiving and storing displacement data, strain data and load data, and displaying the received data on a display interface in a numerical value or curve graph mode;
and the data analysis module compares the detected displacement data and the strain data with theoretical values, calculates a check coefficient, and calculates the deflection and the relative residual of the strain after unloading.
4. The road single beam static load test system of claim 3, wherein: the static load test loading system comprises a variable frequency motor controller and a jack (5), wherein the jack (5) is arranged at the top of the beam (1) to be tested, a cross load beam (3) is arranged at the upper end of the jack (5), and a pressure beam (2) is arranged on the upper side of the cross load beam (3);
the variable frequency motor controller is in signal connection with the jack (5) and is used for controlling the starting, stopping and loading rate of the jack (5);
and the variable frequency motor controller is in signal connection with the loading control module.
5. The road single beam static load test system of claim 4, wherein: the load data acquisition system is a bridge type loading force sensor (4), and the bridge type loading force sensor (4) is arranged between the jack (5) and the cross beam (3).
6. The road single beam static load test system of claim 3, wherein: the displacement data acquisition system comprises ten bridge type displacement meters (6), wherein two bridge type displacement meters (6) are arranged on the sections of the left side and the right side of the beam (1) to be measured, and two bridge type displacement meters (6) are arranged on the quarter length section, the half length section and the three-quarter length section of the beam (1) to be measured.
7. The road single beam static load test system of claim 6, wherein: and the data analysis module is used for drawing the deflection lines of the left side and the right side or the average value of the beam (1) to be measured according to the displacement measured value, comparing the deflection lines with the deflection line of a theoretical value, drawing a load-displacement curve according to the measured value of each measuring point and analyzing the linearity of the curve.
8. The road single beam static load test system of claim 3, wherein: strain data acquisition system includes ten resistance strain gauges, and ten resistance strain gauges form ten strain measurement points on the mid-span section of roof beam (1) that awaits measuring, the bottom plate of roof beam (1) that awaits measuring has two strain measurement points, roof beam (1) both sides flange board that awaits measuring all has a strain measurement point, the quarter height, the half height and the three-quarter height of roof beam (1) both sides web that awaits measuring all have a strain measurement point.
9. The road single beam static load test system of claim 8, wherein: the data analysis module draws a strain-beam height relation curve according to the measured strain values, analyzes the distribution condition of the strain on the test section of the beam (1) to be tested, and simultaneously draws a load-strain curve according to the measured values of the test points and analyzes the linearity of the curve.
10. The road single beam static load test system of claim 3, wherein: the loading control module comprises an automatic loading mode and a manual loading mode, the automatic loading mode adopts single-cycle loading, and the single-cycle loading comprises the following steps: 0% -25% of load-50% of load-75% of load-100% of load-50% of load-0% of load.
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| CN112345181A (en) * | 2020-10-23 | 2021-02-09 | 福建广铁钢结构有限公司 | T-beam static load test method |
| CN112556951A (en) * | 2020-11-27 | 2021-03-26 | 苏交科集团检测认证有限公司 | Test device and test method for rapid load test of prefabricated T-shaped beam |
| CN113740168A (en) * | 2021-08-27 | 2021-12-03 | 四川交达预应力工程检测科技有限公司 | Anchor rod load test robot and control method |
| CN115450270A (en) * | 2022-10-26 | 2022-12-09 | 上海公路桥梁（集团）有限公司 | Loading method for prestress box girder bearing capacity failure test |
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| CN113740168A (en) * | 2021-08-27 | 2021-12-03 | 四川交达预应力工程检测科技有限公司 | Anchor rod load test robot and control method |
| CN115450270A (en) * | 2022-10-26 | 2022-12-09 | 上海公路桥梁（集团）有限公司 | Loading method for prestress box girder bearing capacity failure test |
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