CN111982446A - Device and method for testing accessory foundation of power transmission line impacted by rolling stones - Google Patents
Device and method for testing accessory foundation of power transmission line impacted by rolling stones Download PDFInfo
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- CN111982446A CN111982446A CN202010619707.6A CN202010619707A CN111982446A CN 111982446 A CN111982446 A CN 111982446A CN 202010619707 A CN202010619707 A CN 202010619707A CN 111982446 A CN111982446 A CN 111982446A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/08—Shock-testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/32—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring the deformation in a solid
Abstract
The invention discloses a device and a method for testing an auxiliary foundation of a power transmission line impacted by a rolling stone. In order to overcome the problems that complex mountainous terrain cannot be accurately simulated and different kinds of rolling stones cannot be effectively prevented from impacting the iron tower, the device comprises a support, a tower to be tested, the rolling stones and a high-speed camera, wherein an inclined sliding surface is arranged on the support, a through groove which is longitudinally arranged is arranged on the sliding surface, and a plurality of small stones are embedded in the inner wall of the through groove; the tower to be measured is arranged close to the lowest point of the through groove, a pressure sensor is arranged on the side, opposite to the through groove, of the tower to be measured, and a displacement sensor is arranged on the side, opposite to the through groove, of the tower to be measured; the rolling stone can roll down along the through groove and impact the tower to be tested; the high-speed camera is used for collecting image information in the movement process of the rolling stone. The test device has stable test data, comprehensive measurement data and authenticity; various test conditions are flexibly adjusted, various test scenes can be simulated, and a real and reliable reference is provided for preventing and controlling the rolling stone impact of the auxiliary foundation of the power transmission line.
Description
Technical Field
The invention relates to the field of test simulation tests, in particular to a device and a method for testing an auxiliary foundation of a power transmission line impacted by a rolling stone.
Background
The power transmission lines are distributed along mountainous areas with rare smoke, the lines are long, the spanned geological and landform areas are complex, and the existing geological disasters are various. Particularly, in some areas with fragile geological environment, complex structure, broken rock mass, abundant rainfall and special conditions, the geological environment and the climatic conditions make the area always be a high-incidence area and a multi-incidence area of geological disasters. Landslide and rock rolling disasters are common geological disasters in the area, have the characteristics of sudden occurrence, poor predictability, high speed, high energy, long movement distance, large influence range, difficult monitoring and early warning, serious harm and the like, and are key points and difficult points of disaster prevention and reduction of geological disasters in mountainous areas.
Therefore, to ensure that the line can normally and safely operate, the control of geological disasters along the line of the power transmission line is the key for ensuring the safe and stable operation of the power transmission line. The tower is an important component and a weak link of the transmission line project and is also an object needing important protection during the operation of the transmission line. The tower foot is the key position of shaft tower, determines the whole stability of shaft tower structure. However, because the distribution range of the rockfall disasters in mountainous areas of China is wide and the scale is large, a plurality of towers are difficult to avoid the region with the rockfall disasters, and a large number of tower legs have to directly face the threat of the rockfall disasters. In recent years, along with the frequent occurrence of rock disasters, especially in geological active zones of mountainous areas, the rock disasters pose a significant threat to power transmission lines which are already finished or are being built in mountainous areas in China: the high energy repeated impact effect causes the tower feet of the tower to be damaged, and the whole instability of the tower is caused.
Therefore, experimental research is carried out aiming at the problems that collapse rolling stones are generated due to landslide instability and impact is caused on a power transmission line tower to cause inclination and instability of the tower, the impact resistance of tower legs of the tower is effectively improved, disasters caused by tower instability due to rolling stone impact are reduced, and the method has important significance for safe and stable operation of the power transmission line.
For example, a "simulation test system for starting, moving and impacting side slope rolling stones" disclosed in chinese patent literature, which is disclosed in No. CN207280720U, is composed of a side slope rolling stone slideway model, a rolling stone impact test system, a first rolling stone motion recording system, a second rolling stone motion recording system, a test data processing system, a plurality of connecting lines and experimental rolling stones, wherein the side slope rolling stone slideway model, the rolling stone impact test system, the first rolling stone motion recording system, the second rolling stone motion recording system and the test data processing system are respectively arranged on a workbench and are respectively connected with the test data processing system through the plurality of connecting lines. Although the device can test the influence that different slopes rock rolling strikes and brings, still can't simulate complicated mountain area geology geomorphology and influence to transmission line's iron tower, can't effectively prevent and treat.
Disclosure of Invention
The invention mainly solves the problem that the prior art can not accurately and effectively simulate complicated geological topography in mountainous areas and cause the rolling stones with different masses and shapes to impact the power transmission line iron tower, thereby being incapable of effectively preventing and treating; the device and the method for testing the auxiliary foundation of the power transmission line impacted by the rolling stones can accurately simulate the impact process of the rolling stones with different qualities and shapes on the auxiliary foundation of the power transmission line in the mountainous terrain, and provide reference data for prevention and control of the actual auxiliary foundation of the power transmission line impacted by the rolling stones through accurate and comprehensive simulation.
The technical problem of the invention is mainly solved by the following technical scheme:
a device for testing the auxiliary foundation of a power transmission line impacted by rolling stones comprises
The bracket is provided with an inclined sliding surface;
the through groove is longitudinally arranged along the sliding surface, and a plurality of small stones are embedded in the inner wall of the through groove;
the diameters of the rolling stones are smaller than those of the through grooves;
the tower to be tested is arranged on one side of the lowest point of the inclined sliding surface, and the bottom of the tower to be tested is inserted into the ground;
the pressure sensor is arranged on one side, opposite to the through groove, of the tower to be measured;
the displacement sensor is arranged on one side of the tower to be measured, which is back to the through groove;
the high-speed camera covers all the through grooves and the tower to be measured in the visual field.
According to the technical scheme, the small stone blocks are embedded in the through grooves, so that the mountainous terrain can be simulated more accurately; the method comprises the steps of simulating the impact process of the rolling rock rolling on the auxiliary foundation of the power transmission line by using rolling rocks of different masses and different shapes, collecting various key parameters in the impact process of the rolling rocks by using sensors such as a high-speed camera and a pressure sensor, and analyzing the impact influence of the rolling rocks on the auxiliary foundation of the power transmission line by the collected parameters. The test data is stable, the measurement data is comprehensive, and the authenticity is realized; various test conditions are flexibly adjusted, and various test scenes can be simulated; and a control variable method is adopted, so that a plurality of test parameters can be conveniently analyzed, and a real and reliable reference is provided for preventing and controlling the rolling stone impact of the auxiliary foundation of the power transmission line.
Preferably, an adjusting support rod is arranged in the support, and one end of the adjusting support rod is connected with the sliding surface. The inclination degree of the sliding surface is changed by changing the length of the adjusting support rod, so that the impact of the rolling stones with different heights on the tower to be tested can be simulated, and the experimental data are more comprehensive, real and reliable.
Preferably, a damping protection plate is arranged on the tower to be tested on the side opposite to the through groove, the damping protection plate comprises a reinforced concrete layer and a polystyrene foam layer which are fixedly connected, the reinforced concrete layer is opposite to the through groove, and the polystyrene foam layer is tightly attached to the surface of the tower to be tested. Carry out the rolling stone impact test after adding the shock attenuation guard plate, through before applying the shock attenuation guard plate and applying the experimental data of shock attenuation guard plate and contrast, the shock attenuation guard plate of different thickness can be analyzed to the protection degree of shaft tower that awaits measuring. The method provides a real and reliable reference for preventing and controlling the rolling stone impact of the auxiliary foundation of the power transmission line.
Preferably, the tower to be tested is provided with a corrosion part at the position of the ground junction. The actual tower foundation of the iron tower is often corroded and cracked, the exposed steel bar part of the iron tower is rusted, the rusted part is arranged at the underground and overground boundary of the tower to be detected, and the tower to be detected is made of Q235 angle steel. The method can simulate the actual situation and research the reaction of the iron tower to the impact of the rolling stones under the condition of corrosion.
Preferably, a valve is arranged in the through groove on the higher side of the sliding surface, and a rolling stone is placed above the valve. According to the requirements of the test conditions on the height of the rolling stones and the length of the through groove, the valve can be arranged at the top of the through groove or in the through groove, the rolling stones are placed above the valve, and when the valve is opened, the rolling stones freely roll along the through groove. The valve is arranged, so that the height of the rolling stone can be more accurately positioned, and the accuracy of the test is facilitated.
Preferably, the height from the lowest point of the through groove to the ground is not less than 1 m; the distance from the lowest point of the through groove to the horizontal position of the tower to be measured is 2.0-3.0 m. The fall between the lowest point of the through groove and the ground is used for simulating the impact of the rolling stones on the tower to be tested during jumping movement or landslide collapse possibly generated in the rolling process. In the process that the rolling stones fall from the through grooves, because the rolling stones keep a certain speed component in the horizontal direction, when the rolling stones do not reach the ground, namely, when the lower parts of the towers to be tested are impacted, the rolling stones still can be displaced in the horizontal direction in the process of falling in the air, and the displacement is obtained through tests and is generally within the range of 2.0 m-3.0 m. The distance from the through groove to the horizontal part of the tower to be tested is 2.0-3.0 m, so that a scene that the rolling stone impacts the lower part of the tower to be tested is simulated. The simulation experiment is more comprehensive and is close to reality.
Preferably, at least five groups of pressure sensors are arranged on the tower to be tested; and the tower to be tested extends upwards from the ground and is provided with a group of pressure sensors every 4.5 cm-5.5 cm. Different shapes and different masses of rolling stones are applied to different slopes of the through groove to be different in impact position of the tower to be tested, and a plurality of groups of pressure sensors are arranged, so that the test range is enlarged, and the rolling stones in various shapes and various masses are adapted to be tested.
Preferably, at least two groups of displacement sensors are arranged on the tower to be detected; a tower to be measured extends upwards from the ground and is provided with a group of displacement sensors every 9-11 cm. When the tower to be tested is subjected to different impacts, the deformation values generated by the tower to be tested are different, and the displacement is larger at the higher horizontal position in the same impact process. At least two sets of displacement sensor that set up from top to bottom are set up to increase detection accuracy.
A method for testing the auxiliary foundation of a power transmission line impacted by a rolling stone comprises the following steps:
s1: placing the rolling stones in the through grooves on the sliding surface, so that the rolling stones freely roll down in the through grooves;
s2: the rolling stone rolls off and impacts a tower to be detected, and the pressure sensor acquires the pressure value applied to the tower to be detected; the displacement sensor collects a displacement value generated by the tower to be measured; the high-speed camera collects image information in the movement process of the rolling stone;
s3: displaying an impact force-time response process according to the collected pressure value change; displaying the tower deflection-time response process according to the collected displacement value change; calculating the speed of the rolling stones when impacting the tower to be tested according to the position information of the rolling stones in the image information and the sampling frequency of the image information;
s4: and after multiple control variable tests, analyzing the influence relationship of different variables on the impact of the rolling stones on the tower to be tested.
The method comprises the steps of simulating the impact process of the rolling stones with different qualities and different shapes on the auxiliary foundation of the power transmission line in mountainous terrain with different heights and different gradients, and collecting various key parameters in the impact process of the rolling stones, such as impact force when a tower to be detected is impacted, a deformation value calculated by collecting the displacement value of the tower to be detected, the speed of the rolling stones during impact, the speeds corresponding to different angles of the rolling stones and the like. The measured data is comprehensive and has authenticity; various test conditions are flexibly adjusted, and various test scenes can be simulated; the variable can be controlled, a plurality of test parameters can be conveniently analyzed, and data support is provided for preventing and treating the iron tower from being hit by the rolling stones.
Preferably, the control variables comprise the shape of the rolling stone, the mass of the rolling stone, the gradient of the through groove, the height of the rolling stone in the through groove and the existence of the shock absorption protection plate. Through to control variable, can study the influence that different variables brought to the rock roll striking iron tower for experimental data more closely approaches reality, provides real powerful data support for preventing and treating the rock roll striking.
The invention has the beneficial effects that:
1. the design of leading to the groove has fixed the motion range of stone rolling, and convenient measurement, data can not have great deviation, are convenient for statistics. Small stones with different sizes and shapes are placed in the through grooves to simulate the complex environment of the landform and the landform in the mountainous area, and the measured data is real and reliable. The test data is stable and has authenticity.
2. The moving speed of the rolling stones and the impact force of the rolling stones can be accurately measured through the high-speed camera and the pressure sensor, the displacement sensor can output the deformation of the tower footing to evaluate the deflection of the tower footing, the data are favorable for analyzing the impact influence of the rolling stones on the iron tower, and the measured data are comprehensive.
3. Through comparing the experimental data before applying the damping protection plate and applying the damping protection plate, the protection degree of the damping protection plate with different thicknesses on the tower to be tested can be analyzed. The method provides a real and reliable reference for preventing and controlling the rolling stone impact of the auxiliary foundation of the power transmission line.
Drawings
FIG. 1 is a schematic structural diagram of a testing apparatus according to the present invention.
FIG. 2 is a flow chart of a test method of the present invention.
In the figure, 1, a support, 2, a through groove, 3, a rolling stone, 4, a valve, 5, a tower to be measured, 6, a pressure sensor, 7, a displacement sensor, 8, a high-speed camera, 9, a damping protection plate, 91, a reinforced concrete layer and 92, a polystyrene foam layer are arranged.
Detailed Description
The technical scheme of the invention is further specifically described by the following embodiments and the accompanying drawings.
Example (b):
a device for testing whether a rolling stone impacts an auxiliary foundation of a power transmission line is shown in figure 1 and comprises a support 1, a rolling stone 3, a tower 5 to be tested and a high-speed camera 8. A tower 5 to be tested is arranged outside the support 1, and the bottom of the tower 5 to be tested is inserted into the ground; the tower 5 to be tested is made of Q235 angle steel, and the tower 5 to be tested is used for simulating a power transmission line iron tower and an auxiliary foundation thereof.
The tower 5 to be measured is provided with a corrosion part at the position of the junction of the ground. The actual tower footing of the iron tower often corrodes when splitting, and the reinforcing bar part of the iron tower that exposes just rusts, sets up the corrosion part in the place of the 5 underground and the ground boundaries of shaft tower 5 that awaits measuring, more can the emulation reality condition, the reaction of iron tower to the rock wool striking under having the corrosion condition pipe.
Be equipped with the spigot surface of slope on the support 1, be equipped with on the spigot surface along spigot surface from the top vertical logical groove 2 that sets up, rock is 3 to be set up in leading to groove 2, and rock 3 adopts granite particle simulation mountain stone, and rock 3 rolls along leading to groove 2 and falls and striking shaft tower 5 that awaits measuring. In the embodiment, the length of the sliding surface is 7m, the width of the sliding surface is 30cm, and the sliding surface is mainly supported by a steel frame; the cross section of the through groove 2 is 30cm wide and 50cm high, a plurality of small stones are embedded in the inner wall of the through groove 2, and the small stones are used for simulating the complex earth surface state of the landslide in the mountainous area.
An adjusting support rod is arranged in the support 1, and one end of the adjusting support rod is connected with the sliding surface. The inclination degree of the sliding surface is changed by changing the length of the adjusting support rod, so that the impact of the rolling stones with different heights on the tower to be tested can be simulated, and the experimental data are more comprehensive, real and reliable.
The high-speed camera 8 covers all the through grooves 2 and the tower 5 to be measured. The high-speed camera 8 is used for collecting image information during the movement of the rolling stone 3. The high-speed camera 8 records the whole process that the rolling stone 3 impacts the tower 5 to be tested, and then the information such as the movement speed of the rolling stone 3 is determined by adopting image analysis. Specifically, the high-speed camera 8 records paths of the rolling stones 3 when rolling from different angles and different heights through continuous changes of images so as to analyze influences of the rolling stones 3 on the speed of the rolling stones 3 when rolling from different angles and different heights, and also records information such as paths and speeds of the rolling stones 3 rebounding after impacting the tower 5 to be tested when rolling from different angles and different heights, so that the information can be used as original data for tracing in subsequent further analysis.
In this embodiment, the tower 5 to be measured is a tower foot of a prefabricated reinforced concrete tower, and the pier is 1.0m high and 30cm in diameter. The tower 5 to be tested is arranged close to the lowest point of the through groove 2, and the tower 5 to be tested is impacted after the rolling stone 3 rolls down along the through groove 2 so as to simulate the situation that the mountain stone impacts the power transmission line iron tower and the auxiliary foundation of the power transmission line iron tower.
And a pressure sensor 6 is arranged on one side of the tower 5 to be measured, which is opposite to the through groove 2. When the tower 5 to be tested bears the impact of the rolling stones 3, the pressure sensor 6 detects the impact force borne by the tower 5 to be tested and feeds back the impact force.
At least five groups of pressure sensors 6 are arranged on the tower 5 to be measured, and a group of pressure sensors 6 are arranged at intervals of 5cm and extend upwards from the ground. Specifically, the 5 th cm, the 10 th cm, the 15 th cm, the 20 th cm and the 25 th cm of the tower 5 to be measured, which extend upwards from the ground, are respectively provided with a group of pressure sensors 6 arranged side by side. In this embodiment, each group of pressure sensors 6 includes three pressure sensors arranged side by side, and fifteen pressure sensors 6 are arranged on the tower 5 to be tested, so as to increase the test surface of the test device.
Different shapes and different masses of the rolling stones 3 are applied to different slopes of the through groove 2 to be different in impact position of the tower 5 to be tested, and a plurality of groups of pressure sensors 6 are arranged to increase the test range and adapt to test the rolling stones 3 in various shapes and various masses.
And a displacement sensor 7 is arranged on one side of the tower 5 to be measured, which is back to the through groove 2. At least two groups of displacement sensors 7 are arranged on the tower 5 to be measured, and a group of displacement sensors 7 are arranged at intervals of 10cm and extend upwards from the ground. In this embodiment, a group of displacement sensors 7 is respectively arranged at the 10 th cm and the 20 th cm of the tower 5 to be measured, which extend upwards from the ground, and each group of displacement sensors 7 includes two displacement sensors arranged side by side.
When the tower 5 to be tested is subjected to different impacts, the deformation values generated by the tower are different, and the displacement amount of the tower is larger at the higher horizontal position in the same impact process. At least two sets of displacement sensors 7 arranged up and down are provided to increase the detection accuracy.
And a damping protection plate 9 is arranged on one surface of the tower 5 to be tested, which is opposite to the through groove 2. The shock absorption protection plate 9 can be detached. The shock absorption protection plate 9 comprises a reinforced concrete layer 91 and a polystyrene foam layer 92 which are fixedly connected. The reinforced concrete layer 91 faces the through groove 2, and the polystyrene foam layer 92 is tightly attached to the surface of the tower 5 to be measured.
The polystyrene foam has the advantages of small density, good mechanical strength, excellent buffering performance, good processability and easy molding. The reinforced concrete layer 91 is laid in front of the polystyrene foam layer 92, so that the stress characteristic of the polystyrene foam layer 92 can be improved, the concentrated load is uniformly diffused, the polystyrene foam layer 92 is prevented from being damaged due to stress concentration, the polystyrene foam layer 92 forms a good whole, and harmful substances are prevented from invading into the polystyrene foam layer 92.
Carry out 3 bump test of rolling stone after applying shock attenuation guard plate 9, through to before applying shock attenuation guard plate 9 and applying the experimental data behind the shock attenuation guard plate 9 and contrast, the protection degree of the shock attenuation guard plate 9 of different thickness to the shaft tower 5 that awaits measuring can be analyzed. The buffering that stone 3 collided reinforced concrete layer 91 rethread polystyrene foam layer 92 earlier can effectual reduction impact force, makes the even diffusion of concentrated load that it received, can observe the protective effect of this shock attenuation guard plate 9 through monitoring pressure sensor 6 detected value and displacement sensor 7 detected value. And then carrying out contrastive analysis on the test effects of the damping protection plates 9 with different thicknesses, carrying out optimization experiment on the protection structure of the rolling stone 3 impact tower, and comparing the test effects with the situation that the energy-consuming damping protection plates 9 are not laid.
The through groove 2 is provided with a valve 4, the valve 4 can be arranged at the top of the through groove 2 or in the through groove 2 according to the requirements of the test conditions on the height of the rolling stones 3 and the length of the through groove 2, and the rolling stones 3 are arranged above the valve 4.
When the valve 4 is opened, the rolling stone 3 freely rolls along the through groove 2. The valve 4 is arranged, so that the height of the rolling stone 3 can be more accurately positioned, and the accuracy of the test is facilitated.
In this embodiment, the height from the lowest point of the through groove 2 to the ground is not less than 1 m. The fall between the lowest point of the through groove 2 and the ground is used for simulating the impact of the rolling stone 3 on the tower 5 to be tested during jumping movement or landslide collapse which may be generated in the rolling process, and is also suitable for a test scene when the gradient of the through groove 2 is larger.
The distance from the through groove 2 to the horizontal position of the tower 5 to be tested is 2.0 m-3.0 m. In the process that the rolling stones 3 fall from the lowest points of the through grooves 2, because the rolling stones 3 keep certain speed components in the horizontal direction, when the rolling stones 3 do not reach the ground, namely, when the rolling stones do not impact the lower parts of the towers 5 to be tested, the rolling stones still can be displaced in the horizontal direction in the process of falling in the air, and the displacement is obtained through tests and is generally within the range of 2.0 m-3.0 m. The distance from the through groove 2 to the horizontal part of the tower 5 to be tested is 2.0 m-3.0 m, so that a scene that the rolling stone 3 impacts the lower part of the tower 5 to be tested is simulated.
A method for testing the auxiliary foundation of a power transmission line hit by a rolling stone is shown in figure 2 and comprises the following steps:
s1: the rolling stones 3 are placed in the through grooves 2 on the sliding surface so that the rolling stones 3 roll off freely in the through grooves 2.
Roll stone 3 and place in valve 4 top, open valve 4 and make roll stone 3 freely roll in leading to groove 2, can change the height of roll stone 3 through changing the position that valve 4 set up in leading to groove 2 for control variable simulates the impact influence to the iron tower that the free roll of roll stone 3 of different heights caused.
S2: the rolling stone 3 rolls down to impact the tower 5 to be measured. The pressure sensor 6 collects the pressure value of the tower 5 to be measured; the displacement sensor 7 collects a displacement value generated by the tower 5 to be measured; the high-speed camera 8 collects image information during the movement of the rolling stone 3.
S3: displaying an impact force-time response process according to the collected pressure value change; displaying the tower deflection-time response process according to the collected displacement value change; and calculating the speed of the rolling stone 3 when the rolling stone 3 impacts the tower 5 to be measured according to the position information of the rolling stone 3 in the image information and the sampling frequency of the image information.
S4: and after multiple control variable tests, analyzing the influence relationship of different variables on the impact of the rolling stones 3 on the tower 5 to be tested.
The control variables include the shape of the rolling stones 3, the mass of the rolling stones 3, the gradient of the through grooves 2, the height of the rolling stones 3 in the through grooves 2, and the presence or absence of the shock-absorbing protection plates 9.
Through the control variable experiment, the influence of each variable on the iron tower impacted by the rolling stones 3 can be analyzed and obtained, data support is provided for preventing and controlling the iron tower impacted by the rolling stones 3, and the iron tower is prevented and controlled in a targeted manner.
The method can accurately simulate the impact process of the rolling stones 3 with different qualities and different shapes on the subsidiary foundation of the power transmission line in mountainous terrain with different heights and different gradients, and collect various key parameters in the impact process of the rolling stones 3, such as impact force when the tower 5 to be tested is impacted, a deformation value calculated by collecting the displacement value of the tower 5 to be tested, the speed of the rolling stones 3 during the impact, the speeds corresponding to different angles of the rolling stones 3 during the rolling.
The device is also used for simulating the process that the auxiliary foundation of the power transmission line with the shock absorption protection device is impacted, testing different test conditions, and analyzing the impact influence of the rolling stone 3 on the auxiliary foundation of the power transmission line through various collected parameters. The method provides a real and reliable reference for preventing and controlling the rolling stone impact of the auxiliary foundation of the power transmission line, and selects effective protection measures.
The scheme has stable test data, comprehensive measurement data and authenticity; various test conditions are flexibly adjusted, and various test scenes can be simulated; the variable can be controlled, and a plurality of test parameters can be conveniently analyzed.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. A device for testing the auxiliary foundation of a power transmission line impacted by a rolling stone is characterized by comprising
The device comprises a bracket (1), wherein an inclined sliding surface is arranged on the bracket (1);
the through groove (2) is longitudinally arranged along the sliding surface, and a plurality of small stones are embedded in the inner wall of the through groove (2);
the diameters of the rolling stones (3) are smaller than those of the through grooves (2);
the tower (5) to be tested is arranged on one side of the lowest point of the inclined sliding surface, and the bottom of the tower (5) to be tested is inserted into the ground;
the pressure sensor (6) is arranged on one side, opposite to the through groove (2), of the tower (5) to be measured;
the displacement sensor (7) is arranged on one side, back to the through groove (2), of the tower (5) to be measured;
and the high-speed camera (8) covers all the through grooves (2) and the tower (5) to be tested in the visual field.
2. The device for testing the auxiliary foundation of the power transmission line impacted by the rolling stones as claimed in claim 1, wherein an adjusting support rod is arranged in the bracket (1), and one end of the adjusting support rod is connected with the sliding surface.
3. The device for testing the auxiliary foundation of the power transmission line impacted by the rolling stones according to claim 1, wherein a damping protection plate (9) is arranged on one surface, facing the through groove (2), of the tower (5) to be tested, the damping protection plate (9) comprises a reinforced concrete layer (91) and a polystyrene foam layer (92) which are fixedly connected, the reinforced concrete layer (91) faces the through groove (2), and the polystyrene foam layer (92) is tightly attached to the surface of the tower (5) to be tested.
4. The device for testing the auxiliary foundation of the power transmission line impacted by the rolling stones as claimed in claim 1 or 3, wherein the tower (5) to be tested is provided with a rust part at the position of the ground boundary.
5. The device for testing the auxiliary foundation of the power transmission line impacted by the rolling stones according to the claim 1 is characterized in that a valve (4) is arranged in the through groove (2) on the higher side of the sliding surface, and the rolling stones (3) are placed above the valve (4).
6. The device for testing the auxiliary foundation of the power transmission line impacted by the rolling stones as claimed in claim 1 or 5, wherein the height from the lowest point of the through groove (2) to the ground is not lower than 1 m; the distance from the lowest point of the through groove (2) to the horizontal point of the tower (5) to be measured is 2.0-3.0 m.
7. The device for testing the auxiliary foundation of the rolling stone impact power transmission line according to claim 1, wherein at least five groups of pressure sensors (7) are arranged on the tower (5) to be tested; the tower (5) to be measured extends upwards from the ground and is provided with a group of pressure sensors (6) every 4.5 cm-5.5 cm.
8. The device for testing the auxiliary foundation of the power transmission line impacted by the rolling stones as claimed in claim 1 or 7, wherein at least two groups of displacement sensors (7) are arranged on the tower (5) to be tested; a tower (5) to be measured extends upwards from the ground and is provided with a group of displacement sensors (7) every 9-11 cm.
9. A method for testing an auxiliary foundation of a rolling stone impact power transmission line adopts a device for testing the auxiliary foundation of the rolling stone impact power transmission line in any one of claims 1-8, and is characterized by comprising the following steps:
s1: placing the rolling stones (3) in the through grooves (2) on the sliding surface, so that the rolling stones (3) freely roll down in the through grooves (2);
s2: the rock rolling (3) rolls and impacts the tower (5) to be tested, and the pressure sensor (6) collects the pressure value applied to the tower (5) to be tested; the displacement sensor (7) collects a displacement value generated by the tower (5) to be measured; the high-speed camera (8) collects image information in the movement process of the rolling stone (3);
s3: displaying an impact force-time response process according to the collected pressure value change; displaying the tower deflection-time response process according to the collected displacement value change; calculating the speed of the rolling stone (3) when the rolling stone (3) impacts the tower (5) to be tested according to the position information of the rolling stone (3) in the image information and the sampling frequency of the image information;
s4: after multiple control variable tests, the influence relationship of different variables on the impact of the rolling stone (3) on the tower (5) to be tested is analyzed.
10. The method for testing whether the rolling stones strike the auxiliary foundation of the power transmission line according to the claim 9, wherein the control variables comprise the shape of the rolling stones (3), the mass of the rolling stones (3), the gradient of the through grooves (2), the height of the rolling stones (3) in the through grooves (2), and the presence or absence of the shock absorption protection plates (9).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010619707.6A CN111982446A (en) | 2020-06-30 | 2020-06-30 | Device and method for testing accessory foundation of power transmission line impacted by rolling stones |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010619707.6A CN111982446A (en) | 2020-06-30 | 2020-06-30 | Device and method for testing accessory foundation of power transmission line impacted by rolling stones |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111982446A true CN111982446A (en) | 2020-11-24 |
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| CN112781823A (en) * | 2021-01-15 | 2021-05-11 | 三峡大学 | Iron tower impact test device and method based on pneumatic ejection rolling stones |
| CN112924128A (en) * | 2021-01-31 | 2021-06-08 | 重庆科技学院 | Pier rolling stone impact model and impact force measuring method |
| CN113267310A (en) * | 2021-05-17 | 2021-08-17 | 湖北大学 | Impact test analysis method and system for power transmission line tower |
| CN113358318A (en) * | 2021-07-02 | 2021-09-07 | 中国空气动力研究与发展中心低速空气动力研究所 | Cable collision detection method, device, equipment and storage medium |
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