CN114264463A - Load test device and method for angle steel bolt connection node of power transmission tower - Google Patents
Load test device and method for angle steel bolt connection node of power transmission tower Download PDFInfo
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- CN114264463A CN114264463A CN202111559994.7A CN202111559994A CN114264463A CN 114264463 A CN114264463 A CN 114264463A CN 202111559994 A CN202111559994 A CN 202111559994A CN 114264463 A CN114264463 A CN 114264463A
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Abstract
A load test device and method for a steel angle bolt connection node of a power transmission tower are characterized in that left and right reaction frames are oppositely arranged left and right and are fixedly connected to the left part and the right part of the upper end of a section steel beam respectively; a cylinder barrel base of the servo actuator is fixedly connected with the left end of the right reaction frame, and a telescopic rod end of the servo actuator is arranged opposite to the right end of the left reaction frame; the left and right side fixing frames are respectively composed of a vertical fixing plate, a horizontal limiting plate and a vertical connecting plate; the overturn preventing device is arranged between the servo actuator and the section steel beam; the adjustable support mechanism is disposed between the servo actuator and the section steel beam. The method comprises the following steps: connecting a test device; controlling the servo actuator to apply displacement load, and obtaining a test value by using a computer control system instrument; when the load reading is obviously reduced, or the test angle steel is obviously buckled and deformed, or the connecting bolt is sheared to cause that the test cannot be continuously carried out, the test is terminated. The device and the method can carry out effective load experiments on the bolt connection nodes, and are favorable for obtaining accurate test results.
Description
Technical Field
The invention belongs to the technical field of power transmission towers, and particularly relates to a load test device and method for a power transmission tower angle steel bolt connection node.
Background
The power transmission iron tower is used as a high-rise building space structure and is mostly formed by connecting hot-rolled equilateral angle steel members through bolts, and different node construction modes can influence the bearing capacity of the power transmission iron tower, so that the influence of the structural nodes is considered in necessary research when the structure of the power transmission iron tower is analyzed. In the existing bolt research, most of the existing bolt research only aims at the condition that a bolt slides along the axis direction of a rod piece, and the related research on the mechanical behavior of an angle steel bolt connection node under the action of reciprocating load is less, so that the actual bearing capacity of a power transmission iron tower cannot be comprehensively reflected, and further certain potential safety hazard exists after the power transmission iron tower is put into use. The traditional test device for the power transmission tower is used for testing by welding a steel plate on the head of the angle steel, but the test device is only suitable for testing the tests of few test angle steels and unidirectional pressure loads due to weld joint connection, has poor universality and cannot be used when being applied to bolt connection node loads. Therefore, it is urgently needed to provide a force test device for the angle steel bolt connection node of the power transmission line iron tower, which has the advantages of simple structure, convenience in installation and strong universality.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a device and a method for testing the load of the angle steel bolt connection node of the power transmission tower, wherein the device has a simple structure, is convenient to install, can be suitable for testing the load of the angle steel bolt connection node, has strong universality and is beneficial to obtaining an accurate test result; the method can carry out effective load experiments on the bolt connection nodes, can be beneficial to truly reflecting the actual bearing capacity of the power transmission iron tower, and is beneficial to eliminating potential safety hazards existing in the using process.
The invention provides a load test device for a steel angle bolt connection node of a power transmission tower, which comprises a section steel beam, a left reaction frame, a right reaction frame, a servo actuator, a left fixing frame, a right fixing frame, an anti-overturn device and an adjustable supporting mechanism, wherein the section steel beam is fixed on the left side of the section steel beam;
the section steel beam is horizontally arranged on the ground; the left reaction frame and the right reaction frame are arranged oppositely left and right, and the lower ends of the left reaction frame and the right reaction frame are fixedly connected to the left part and the right part of the upper end of the section steel beam respectively;
the servo actuator is horizontally arranged on the right side of the space between the left reaction frame and the right reaction frame, a cylinder barrel base of the servo actuator is fixedly connected with the left end of the right reaction frame, and a telescopic rod end of the servo actuator is arranged opposite to the right end of the left reaction frame;
the left side fixing frame and the right side fixing frame are respectively composed of a vertical fixing plate, a transverse limiting plate and a vertical connecting plate, the vertical fixing plate is vertically arranged, the transverse limiting plate is vertically connected to one side of the vertical fixing plate, the vertical connecting plate is vertically connected to one side of the vertical fixing plate, and the lower end edge of the vertical connecting plate is simultaneously and fixedly connected with the upper end face of the transverse limiting plate; the left side fixing frame and the right side fixing frame are oppositely arranged left and right, a vertical fixing plate of the left side fixing frame is fixedly connected to the right end of the left side reaction frame, and a vertical fixing plate of the right side fixing frame is fixedly connected to a telescopic rod end of the servo actuator;
the overturn preventing device is arranged between the right side fixing frame and the section steel beam, the overturn preventing device consists of a fixing base A positioned at the bottom and a support frame A connected to the top of the fixing base A, and the fixing base A is fixedly connected to the upper end of the section steel beam; the supporting frame A mainly comprises two side plates and a carrier roller, wherein the two side plates are positioned at the top of the supporting frame A and are arranged at the outer sides of the front end edge and the rear end edge of a transverse limiting plate in a right side fixing frame in a front-back opposite mode, the inner side surfaces of the two side plates are respectively in sliding fit with the front end edge and the rear end edge of the transverse limiting plate in the right side fixing frame, so that the transverse limiting plate in the right side fixing frame can only transversely move in the left-right direction and cannot turn over; the carrier roller is arranged in the middle of the two side plates, the front end and the rear end of the carrier roller are respectively rotatably connected with the two side plates, and the upper edge of the carrier roller is in rolling fit with the lower end face of the transverse limiting plate in the right side fixing frame;
the adjustable supporting mechanism is arranged between the servo actuator and the section steel beam and consists of a fixed base B positioned at the bottom and an L-shaped limiting plate connected to the top of the fixed base B, and the fixed base B is fixedly connected to the upper end of the section steel beam; the upper end face of the horizontal section of the L-shaped limiting plate is abutted against the lower end of the head of the cylinder barrel of the servo actuator, the side face of the vertical section of the L-shaped limiting plate is abutted against the side face of the head of the cylinder barrel of the servo actuator, and the L-shaped limiting plate is fixedly connected with the head of the cylinder barrel of the servo actuator and used for preventing the servo actuator from moving laterally.
Furthermore, in order to effectively limit the turning action of the right side fixing frame while supporting the right side fixing frame and realize the adjustment of the supporting height of the right side fixing frame so as to ensure that the right side fixing frame can accurately act on a connecting node when a displacement load is applied and the working condition that the test angle steel overturns cannot be caused, the fixing base A consists of a bottom plate A, a top plate A and two vertical plates A, and bolt holes A are formed in the two ends of the bottom plate A in the front-back direction; two bolt holes B are formed in the middle of the top plate A at intervals from front to back; the top plate A is horizontally arranged right above the bottom plate A, and two sides in the front-back direction of the top plate A are fixedly connected with the bottom plate A through two vertical plates A arranged at intervals;
the supporting frame A also comprises a supporting plate and two long screws A, and the supporting plate is horizontally arranged above the top plate A; the two long screws A correspondingly penetrate through the two bolt holes B, and each long screw A is connected with a locking nut A on the upper side and the lower side of the top plate A through thread matching; the upper ends of the two long screws A are fixedly connected with the lower end surface of the supporting plate; the lower end edges of the two side plates are fixedly connected to the upper end face of the supporting plate, and the middle parts of the two side plates are oppositely provided with a pair of mounting holes; the front end and the rear end of the carrier roller are respectively and rotatably connected to the pair of mounting holes.
Furthermore, in order to effectively limit the lateral deviation of the servo actuator while supporting the servo actuator and realize the adjustment of the supporting height of the head of the cylinder barrel of the servo actuator so as to ensure that the supporting height can accurately act on the test angle steel when a displacement load is applied, the fixed base B consists of a bottom plate B, a top plate B and two vertical plates B, and bolt holes F are formed in the two ends of the bottom plate B in the front-back direction; a bolt hole G is formed in the middle of the top plate B; the top plate B is horizontally arranged right above the bottom plate B, and the front end and the rear end of the top plate B are fixedly connected with the bottom plate B through two vertical plates B arranged at intervals;
the center of the lower end of the horizontal section of the L-shaped limiting plate is vertically and fixedly connected with a long screw B; the long screw B correspondingly penetrates through the bolt hole G, and the upper side and the lower side of the top plate B are both connected with locking nuts B through thread matching.
Furthermore, for the convenience of fixing left side mount and right side mount, simultaneously, for the convenience of left side mount and right side mount and the connection and the separation of other parts, a plurality of bolt holes E have all been seted up on the vertical fixed plate of left side mount and right side mount, two rows of bolt holes C of longitudinal distribution have all been seted up on the vertical connecting plate of left side mount and the vertical connecting plate of right side mount, two rows of bolt holes D of distributing around all seting up on the horizontal limiting plate of left side mount and the horizontal limiting plate of right side mount.
Furthermore, in order to achieve connection strength and facilitate connection and separation of components, the left reaction frame and the right reaction frame are respectively composed of a horizontal connecting plate, a vertical connecting plate and at least two rib plates, the lower end of the vertical connecting plate is vertically and fixedly connected to the upper end of the horizontal connecting plate, one end of each rib plate is fixedly connected with the horizontal connecting plate, and the other end of each rib plate is fixedly connected with the vertical connecting plate;
the middle part of the top end of the section steel beam is uniformly provided with a plurality of connecting holes A along the length direction, the front side and the rear side of each connecting hole A are provided with a plurality of connecting holes B, and the section steel beam is fixed on the ground through ground anchor bolts penetrating through the connecting holes A; a plurality of connecting holes C are formed in the horizontal connecting plate corresponding to the connecting holes B; a plurality of connecting holes D are formed in the vertical connecting plate; the horizontal connecting plates of the left reaction frame and the right reaction frame are fixedly connected to the section steel beam through high-strength connecting bolts of the connecting holes C and the connecting holes B, and when the length of the test angle steel is changed, the relative positions of the left reaction frame and the right reaction frame on the section steel beam can be adjusted to perform adaptive adjustment so as to meet test requirements; the vertical fixing plate of the left fixing frame is fixedly connected to the vertical connecting plate of the left reaction frame through a high-strength connecting bolt penetrating through the bolt hole E and the connecting hole D; the cylinder barrel base of the servo actuator is fixedly connected to the vertical connecting plate of the right reaction frame through a high-strength connecting bolt penetrating through the connecting hole D; a bottom plate A of the overturn preventing device is fixedly connected to the section steel beam through a high-strength connecting bolt penetrating through the bolt hole A and the connecting hole B; and the bottom plate B of the adjustable supporting mechanism is fixedly connected to the section steel beam through a high-strength connecting bolt penetrating through the bolt hole F and the connecting hole B.
In order to obtain the load data in real time, the system further comprises a computer control system, and the computer control system is connected with the servo actuator.
Preferably, the servo actuator is a 50t servo actuator.
In the invention, the left reaction frame and the right reaction frame are fixedly connected to the upper ends of the section steel beams in a left-right opposite mode, so that loading equipment and test parts required by a test can be conveniently supported between the left reaction frame and the right reaction frame; the cylinder barrel base of the servo actuator is fixedly connected to the right side reaction frame, and one side, opposite to the left side reaction frame, of the telescopic rod end of the servo actuator is fixedly connected with the right side fixing frame and the left side fixing frame respectively, so that two ends of the tested angle steel can be conveniently and fixedly connected, and the bolt connection node on the tested angle steel can be subjected to a one-way compression and pull-compression reciprocating stable bearing force test by changing the direction of a loading force of the servo actuator; the vertical connecting plates are arranged on the opposite sides of the left side fixing frame and the right side fixing frame, so that the vertical sections at two ends of a test angle can be conveniently and fixedly connected, the transverse limiting plates are arranged on the opposite sides of the left side fixing frame and the right side fixing frame, the horizontal sections at two ends of the test angle can be conveniently and fixedly connected, the lower limiting of the test angle steel can be facilitated, the test angle steel can be stably and reliably connected with the left side fixing frame and the right side fixing frame, the condition that the end part of the test angle steel cannot turn over in the test process can be ensured, the accurate and effective action of loading force on a bolt connecting node on the test angle steel can be ensured, and the test accuracy is effectively improved; through the arrangement of the overturn preventing device, the rolling type support can be formed on the transverse limiting plate in the right side fixing frame through the carrier roller, so that the resistance to the transverse movement of the right side fixing frame can not be formed in the test process, and the accurate loading of the load is effectively ensured; meanwhile, the right side fixing frame can only transversely move in the left-right direction through sliding fit between the two side plates and the front end edge and the rear end edge of the transverse limiting plate in the right side fixing frame, and overturning action cannot occur in the test process, so that the acting force can be more accurately transmitted to the bolt connecting node on the test angle steel in the loading process, and the stable operation of the test process can be ensured; through adjustable supporting mechanism's setting, not only can cooperate the right side reaction frame to make servo actuator's cylinder keep the horizontality, can also finely tune servo actuator cylinder's inclination, in order to prevent to cause the not emergence of same axis phenomenon of angle steel of bolted connection node both sides because of reasons such as manufacturing error, moreover, can also restrict servo actuator and take place the condition of lateral deviation in the testing process, thereby enable the bolt connection node on the more accurate transmission of loading process's effect ability to experimental angle steel, the stability of testing process has further been improved, and the accuracy of test result can effectively be improved. The device has the advantages of simple structure, high reliability, wide applicability, repeated utilization and obvious economic benefit.
The invention also provides a load test method for the angle steel bolt connection node of the power transmission tower, which comprises the following steps:
the method comprises the following steps: fixing the section steel beam on the ground through an anchor bolt, and fixedly connecting the left reaction frame and the right reaction frame to the upper end of the section steel beam in a left-right opposite mode;
step two: fixedly connecting a cylinder barrel base of the servo actuator with a vertical connecting plate of a right reaction frame, meanwhile, supporting an adjustable supporting mechanism below the cylinder barrel head of the servo actuator, fixedly connecting a bottom plate B to the upper end of a section steel beam, and adjusting the height of an L-shaped limiting plate by adjusting the position of a locking nut B relative to a long screw B until the height of the cylinder barrel head of the servo actuator meets the requirement of a test; the overturn preventing device is arranged below the right side fixing frame, the bottom plate A is fixedly connected to the upper end of the section steel beam, and the height of the support frame A is adjusted by adjusting the position of the locking nut A relative to the long screw A until the carrier roller reaches the position in abutting fit with the lower end face of the transverse limiting plate in the right side fixing frame;
step three: the left side fixing frame and the right side fixing frame are oppositely arranged left and right, the vertical fixing plate of the left side fixing frame is fixedly connected to the vertical connecting plate of the left side reaction frame, and the vertical fixing plate of the right side fixing frame is fixedly connected to the left end of the telescopic rod end of the servo actuator;
step four: arranging two angle steels horizontally, and fixedly connecting the adjacent ends of the two angle steels through angle steel bolts to form a test angle steel;
the vertical section at the left end of the test angle steel is fixedly connected with the side surface of the vertical fixing plate of the left side fixing frame in an attaching mode through a connecting bolt, and the horizontal section at the left end of the test angle steel is fixedly connected with the upper end surface of the transverse limiting plate of the left side fixing frame in an attaching mode through a connecting bolt; the vertical section of the right end of the test angle steel is fixedly connected with the side face of the vertical fixing plate of the right side fixing frame in an attaching mode through a connecting bolt, and the horizontal section of the right end of the test angle steel is fixedly connected with the upper end face of the transverse limiting plate of the right side fixing frame in an attaching mode through a connecting bolt;
step five: controlling the servo actuator to apply displacement load, and obtaining the numerical value of the displacement load of the test angle steel and the connecting bolt between the two angle steels by using a computer control system;
step six: when the load reading of the computer control system is obviously reduced, or the test angle steel is observed to have obvious buckling deformation, or the connecting bolt between the two angle steels is sheared to cause that the test cannot be continuously carried out, the test is terminated.
Further, in order to effectively guarantee that the actual conditions can be truly simulated to obtain an accurate test result, in step four, after the two ends of the tested angle steel are respectively connected with the left side fixing frame and the right side fixing frame, when the angle steel on the two sides of the bolt connection node is found not to be on the same axis, the height of the support frame A in the overturn preventing device is adaptively adjusted until the angle steel on the two sides of the bolt connection node is on the same axis. Therefore, the phenomenon that the angle steels on two sides of the bolt connecting node are not on the same axis due to reasons such as process errors can be prevented, the acting force in the loading process can be more accurately transmitted to the bolt connecting node on the test angle steel, the stability of the test process is further improved, and the accuracy of the test result can be effectively improved.
In the method, the vertical section at the left end of the test angle steel is fixedly connected with the side surface of the vertical fixed plate of the left side fixed frame in an attaching manner, the horizontal section at the left end of the test angle steel is fixedly connected with the upper end surface of the transverse limiting plate of the left side fixed frame in an attaching manner, the vertical section at the right end of the test angle steel is fixedly connected with the side surface of the vertical fixed plate of the right side fixed frame in an attaching manner, and the horizontal section at the right end of the test angle steel is fixedly connected with the upper end surface of the transverse limiting plate of the right side fixed frame in an attaching manner, so that the test angle steel can be conveniently limited downwards, the test angle steel can be more stably and reliably connected with the left side fixed frame and the right side fixed frame, the end part of the test angle steel in the test process can be prevented from overturning, and the accurate and effective action of loading force on a bolt connection node of the test angle steel can be ensured, the accuracy of the test is effectively improved; the adjustable supporting mechanism is arranged below the head of the cylinder barrel of the servo actuator in a supporting mode, the cylinder barrel of the servo actuator can be kept in a horizontal state by matching with a right reaction frame, the lateral deviation of the servo actuator in the test process can be limited, and meanwhile, the fine adjustment of the inclination angle of the cylinder barrel of the servo actuator can be realized; the overturn preventing device is arranged below the right side fixing frame, so that not only can a transverse limiting plate in the right side fixing frame form a rolling type support through a carrier roller, but also the right side fixing frame can be limited to only transversely move in the left-right direction, and the overturn action cannot occur in the test process; the method is simple in operation steps, can quickly and accurately test and analyze the load condition of the angle steel bolt connection node of the power transmission tower, is favorable for truly reflecting the actual bearing capacity of the power transmission tower, can accurately make real evaluation on the performance of the angle steel bolt connection node, and is favorable for eliminating potential safety hazards.
Drawings
FIG. 1 is a schematic view of the structure of a test apparatus according to the present invention;
FIG. 2 is a top view of the computer control system removed;
FIG. 3 is a schematic structural view of a left side fixing frame or a right side fixing frame according to the present invention;
FIG. 4 is a left side view of FIG. 3;
FIG. 5 is a top view of FIG. 3;
FIG. 6 is a top view of the steel section beam of the present invention;
FIG. 7 is a front view of FIG. 6;
FIG. 8 is a schematic view of the structure of the overturn preventing device of the present invention;
FIG. 9 is a left side view of FIG. 8;
FIG. 10 is a schematic view of the construction of the adjustable support mechanism of the present invention;
FIG. 11 is a left side view of FIG. 10;
FIG. 12 is a schematic view of the structure of the left or right reaction frame of the present invention;
fig. 13 is a top view of fig. 12.
In the figure: 1. the steel structure comprises section steel beams, 2, a servo actuator, 3, a left reaction frame, 4, a right reaction frame, 5, an adjustable supporting mechanism, 6, test angle steel, 7, a left fixing frame, 8, a right fixing frame, 9, ground anchor bolts, 10, the ground, 11, a vertical fixing plate, 12, a computer control system, 13, a transverse limiting plate, 14, a vertical connecting plate, 15, fixing bases A, 16, a supporting frame A,17, a bottom plate A, 18, top plates A, 19, vertical plates A, 20, bolt holes A, 21, a supporting plate, 22, a carrier roller, 23, a long screw rod A, 24, a side plate, 25, a locking nut A, 26, a mounting hole, 27, a bolt hole C, 28, a bolt hole D, 29, a connecting hole A, 30, a connecting hole B, 31, a horizontal connecting plate, 32, a vertical connecting plate, 33, a rib plate, 34, a connecting hole C, 35, a connecting hole D, 36, a bolt hole E, 37, a bolt hole C, a connecting hole E, a connecting hole C, a, The anti-overturning device comprises connecting holes D and 38, an anti-overturning device 39, fixing bases B and 40, L-shaped limiting plates 41, bottom plates B and 42, top plates B and 43, vertical plates B and 44, bolt holes F and 45, long screws B and 46 and locking nuts B.
Detailed Description
The invention will be further explained with reference to the drawings.
As shown in fig. 1 to 13, the load test device for the angle steel bolt connection node of the power transmission tower comprises a section steel beam 1, a left reaction frame 3, a right reaction frame 4, a servo actuator 2, a left fixing frame 7, a right fixing frame 8, an anti-overturning device 38 and an adjustable supporting mechanism 5;
the section steel beam 1 is horizontally arranged on the ground 10; the left reaction frame 3 and the right reaction frame 4 are arranged oppositely left and right, and the lower ends of the left reaction frame and the right reaction frame are respectively and fixedly connected to the left part and the right part of the upper end of the section steel beam 1;
the servo actuator 2 is horizontally arranged on the right side of the space between the left reaction frame 3 and the right reaction frame 4, a cylinder barrel base of the servo actuator is fixedly connected with the left end of the right reaction frame 4, and a telescopic rod end of the servo actuator is arranged opposite to the right end of the left reaction frame 3;
the left side fixing frame 7 and the right side fixing frame 8 are both composed of a vertical fixing plate 11 which is vertically arranged, a transverse limiting plate 13 which is vertically connected to one side of the vertical fixing plate 11, and a vertical connecting plate 14 which is vertically connected to one side of the vertical fixing plate 11, and the lower end edge of the vertical connecting plate 14 is simultaneously and fixedly connected with the upper end face of the transverse limiting plate 13; the left side fixing frame 7 and the right side fixing frame 8 are oppositely arranged left and right, a vertical fixing plate 11 of the left side fixing frame 7 is fixedly connected to the right end of the left side reaction frame 3, and a vertical fixing plate 11 of the right side fixing frame 8 is fixedly connected to the telescopic rod end of the servo actuator 2; as a preference, in order to ensure the accuracy of the test;
the overturn preventing device 38 is arranged between the right side fixing frame 8 and the section steel beam 1, the overturn preventing device 38 consists of a fixing base A15 positioned at the bottom and a support frame A16 connected to the top of the fixing base A15, and the fixing base A15 is fixedly connected to the upper end of the section steel beam 1; the supporting frame A16 mainly comprises two side plates 24 and a carrier roller 22, wherein the two side plates 24 are positioned at the top of the supporting frame A16 and are arranged at the outer sides of the front end edge and the rear end edge of the transverse limit plate 13 in the right side fixing frame 8 in a front-back opposite manner, the inner side surfaces of the two side plates 24 are respectively in sliding fit with the front end edge and the rear end edge of the transverse limit plate 13 in the right side fixing frame 8, so that the transverse limit plate 13 in the right side fixing frame 8 can only transversely move in the left-right direction and cannot turn over; the carrier roller 22 is arranged in the middle of the two side plates 24, the front end and the rear end of the carrier roller are respectively rotatably connected with the two side plates 24, and the upper edge of the carrier roller is in rolling fit with the lower end face of the transverse limiting plate 13 in the right side fixing frame 8;
the adjustable supporting mechanism 5 is arranged between the servo actuator 2 and the section steel beam 1, the adjustable supporting mechanism 5 consists of a fixed base B39 positioned at the bottom and an L-shaped limiting plate 40 connected to the top of the fixed base B39, and the fixed base B39 is fixedly connected to the upper end of the section steel beam 1; the upper end face of the horizontal section of the L-shaped limiting plate 40 is abutted against the lower end of the head of the cylinder of the servo actuator 2, the side face of the vertical section of the L-shaped limiting plate 40 is abutted against the side face of the head of the cylinder of the servo actuator 2, and the L-shaped limiting plate 40 is fixedly connected with the head of the cylinder of the servo actuator 2 and used for preventing the servo actuator 2 from moving laterally.
In the test, the transverse limiting plate 13 of the left side fixing frame 7 and the transverse limiting plate 13 of the right side fixing frame 8 are ensured to be positioned on the same horizontal plane, and the process can be adjusted through the height of the supporting frame A16 in the adjustable overturn preventing device 38 and the height of the L-shaped limiting plate 40 in the supporting mechanism 5.
In order to effectively limit the overturning action of the right side fixing frame while supporting the right side fixing frame and realize the adjustment of the supporting height of the right side fixing frame so as to ensure that the right side fixing frame can accurately act on a connecting node when a displacement load is applied and the working condition that test angle steel overturns cannot be caused, the fixing base A15 consists of a bottom plate A17, a top plate A18 and two vertical plates A19, and bolt holes A20 are formed in the two ends of the bottom plate A17 in the front-back direction; the middle part of the top plate A18 is provided with two bolt holes B at intervals from front to back; the top plate A18 is horizontally arranged right above the bottom plate A17, and two sides of the front and back direction of the top plate A18 are fixedly connected with the bottom plate A17 through two vertical plates A19 arranged at intervals;
the supporting frame A16 further comprises a supporting plate 21 and two long screws A23, wherein the supporting plate 21 is horizontally arranged above the top plate A18; the two long screws A23 correspondingly penetrate through the two bolt holes B, and each long screw A23 is connected with a locking nut A25 on the upper side and the lower side of the top plate A18 in a thread fit manner; the upper ends of the two long screws A23 are fixedly connected with the lower end surface of the supporting plate 21; the lower end edges of the two side plates 24 are fixedly connected to the upper end face of the support plate 21, and the middle parts of the two side plates are oppositely provided with a pair of mounting holes 2; the front and rear ends of the carrier roller 22 are rotatably connected to a pair of mounting holes 26.
In order to effectively limit the lateral deviation of the servo actuator while supporting the servo actuator and realize the adjustment of the supporting height of the head of the cylinder barrel of the servo actuator so as to ensure that the supporting height can accurately act on test angle steel when a displacement load is applied, the fixed base B39 consists of a bottom plate B41, a top plate B42 and two vertical plates B43, and bolt holes F44 are formed in the two ends of the bottom plate B41 in the front-back direction; the middle part of the top plate B42 is provided with a bolt hole G; the top plate B42 is horizontally arranged right above the bottom plate B41, and the front end and the rear end of the top plate B42 are fixedly connected with the bottom plate B41 through two vertical plates B43 arranged at intervals;
the center of the lower end of the horizontal section of the L-shaped limiting plate 40 is vertically and fixedly connected with a long screw B45; the long screw B45 correspondingly penetrates through the bolt hole G, and the upper side and the lower side of the top plate B42 are connected with locking nuts B46 in a threaded fit mode.
For the convenience of fixing the left side mount and the right side mount, simultaneously, for the convenience of connecting and separating the left side mount and the right side mount with other parts, a plurality of bolt holes E36 have all been seted up on the vertical fixed plate 11 of left side mount 7 and right side mount 8, two rows of bolt holes C27 of longitudinal distribution have all been seted up on the vertical connecting plate 14 of left side mount 7 and the vertical connecting plate 14 of right side mount 8, two rows of bolt holes D28 of front and back distribution have all been seted up on the horizontal limiting plate 13 of left side mount 7 and the horizontal limiting plate 13 of right side mount 8.
In order to achieve connection strength and facilitate connection and separation of components, the left reaction frame 3 and the right reaction frame 4 are respectively composed of a horizontal connecting plate 31, a vertical connecting plate 32 and at least two rib plates 33, the lower end of the vertical connecting plate 32 is vertically and fixedly connected to the upper end of the horizontal connecting plate 31, one end of each rib plate 33 is fixedly connected with the horizontal connecting plate 31, and the other end of each rib plate 33 is fixedly connected with the vertical connecting plate 32;
the middle part of the top end of the section steel beam 1 is uniformly provided with a plurality of connecting holes A29 along the length direction, and the front side and the rear side of each connecting hole A are provided with a plurality of connecting holes B30 which are fixed on the ground 10 through ground anchor bolts 9 penetrating through the connecting holes A29;
preferably, the section steel beam 1 is of a box-type structure, so that the section steel beam can be in a balanced state, and the ground anchor bolt 9 plays a role in auxiliary fixing, so that the whole test device is more stable and reliable.
A plurality of connecting holes C34 are formed in the horizontal connecting plate 31 corresponding to the connecting holes B30; a plurality of connecting holes D37 are formed in the vertical connecting plate 32; the horizontal connecting plates 31 of the left reaction frame 3 and the right reaction frame 4 are fixedly connected to the section steel beam 1 through high-strength connecting bolts of a connecting hole C34 and a connecting hole B30, so that the distance between the two can be adjusted adaptively to meet the test requirements of different test angle steels 6; the vertical fixing plate 11 of the left fixing frame 7 is fixedly connected to the vertical connecting plate 32 of the left reaction frame 3 through a high-strength connecting bolt passing through the bolt hole E36 and the connecting hole D37; the cylinder barrel base of the servo actuator 2 is fixedly connected to the vertical connecting plate 32 of the right reaction frame 4 through a high-strength connecting bolt penetrating through the connecting hole D37; the bottom plate A17 of the overturn preventing device 38 is fixedly connected to the section steel beam 1 through a high-strength connecting bolt passing through the bolt hole A20 and the connecting hole B30; the bottom plate B41 of the adjustable supporting mechanism 5 is fixedly connected to the section steel beam 1 through a high-strength connecting bolt passing through the bolt hole F44 and the connecting hole B30. The connecting bolts are high-strength bolts and meet the requirement of test strength.
Preferably, the stress center of the left reaction frame 3, the stress center of the right reaction frame 4, the stress center of the left fixing frame 7, the stress center of the right fixing frame 8 and the stress center of the servo actuator 2 are all at the same height, so that the test precision is ensured.
In order to obtain load data in real time, a computer control system 12 is also included, said computer control system 12 being connected to the servo actuators 2.
Preferably, the servo actuator 2 is a 50t servo actuator.
In the invention, the left reaction frame and the right reaction frame are fixedly connected to the upper ends of the section steel beams in a left-right opposite mode, so that loading equipment and test parts required by a test can be conveniently supported between the left reaction frame and the right reaction frame; the cylinder barrel base of the servo actuator is fixedly connected to the right side reaction frame, and one side, opposite to the left side reaction frame, of the telescopic rod end of the servo actuator is fixedly connected with the right side fixing frame and the left side fixing frame respectively, so that two ends of the tested angle steel can be conveniently and fixedly connected, and the bolt connection node on the tested angle steel can be subjected to a one-way compression and pull-compression reciprocating stable bearing force test by changing the direction of a loading force of the servo actuator; the vertical connecting plates are arranged on the opposite sides of the left side fixing frame and the right side fixing frame, so that the vertical sections at two ends of a test angle can be conveniently and fixedly connected, the transverse limiting plates are arranged on the opposite sides of the left side fixing frame and the right side fixing frame, the horizontal sections at two ends of the test angle can be conveniently and fixedly connected, the lower limiting of the test angle steel can be facilitated, the test angle steel can be stably and reliably connected with the left side fixing frame and the right side fixing frame, the condition that the end part of the test angle steel cannot turn over in the test process can be ensured, the accurate and effective action of loading force on a bolt connecting node on the test angle steel can be ensured, and the test accuracy is effectively improved; through the arrangement of the overturn preventing device, the rolling type support can be formed on the transverse limiting plate in the right side fixing frame through the carrier roller, so that the resistance to the transverse movement of the right side fixing frame can not be formed in the test process, and the accurate loading of the load is effectively ensured; meanwhile, the right side fixing frame can only transversely move in the left-right direction through sliding fit between the two side plates and the front end edge and the rear end edge of the transverse limiting plate in the right side fixing frame, and overturning action cannot occur in the test process, so that the acting force can be more accurately transmitted to the bolt connecting node on the test angle steel in the loading process, and the stable operation of the test process can be ensured; through adjustable supporting mechanism's setting, not only can cooperate the right side reaction frame to make servo actuator's cylinder keep the horizontality, can also finely tune servo actuator cylinder's inclination, in order to prevent to cause the not emergence of same axis phenomenon of angle steel of bolted connection node both sides because of reasons such as manufacturing error, moreover, can also restrict servo actuator and take place the condition of lateral deviation in the testing process, thereby enable the bolt connection node on the more accurate transmission of loading process's effect ability to experimental angle steel, the stability of testing process has further been improved, and the accuracy of test result can effectively be improved. The device has the advantages of simple structure, high reliability, wide applicability, repeated utilization and obvious economic benefit.
The invention also provides a load test method for the angle steel bolt connection node of the power transmission tower, which comprises the following steps:
the method comprises the following steps: fixing the section steel beam 1 on the ground 10 through an anchor bolt 9, and fixedly connecting the left reaction frame 3 and the right reaction frame 4 to the upper end of the section steel beam 1 in a left-right opposite mode;
step two: fixedly connecting a cylinder barrel base of the servo actuator 2 with a vertical connecting plate 32 of a right reaction frame 4, meanwhile, supporting an adjustable supporting mechanism 5 below the cylinder barrel head of the servo actuator 2, fixedly connecting a bottom plate B41 to the upper end of a section steel beam 1, and adjusting the height of an L-shaped limiting plate 40 by adjusting the position of a locking nut B46 relative to a long screw B45 until the height of the cylinder barrel head of the servo actuator 2 meets the requirement of a test; the overturn preventing device 38 is arranged below the right side fixing frame 8, the bottom plate A17 is fixedly connected to the upper end of the section steel beam 1, and the height of the support frame A16 is adjusted by adjusting the position of the locking nut A25 relative to the long screw A23 until the carrier roller 22 reaches the position in abutting fit with the lower end face of the transverse limiting plate 13 in the right side fixing frame 8;
step three: the left side fixing frame 7 and the right side fixing frame 8 are oppositely arranged left and right, the vertical fixing plate 11 of the left side fixing frame 7 is fixedly connected to the vertical connecting plate 32 of the left side reaction frame 3, and the vertical fixing plate 11 of the right side fixing frame 8 is fixedly connected to the left end of the telescopic rod end of the servo actuator 2;
step four: arranging two angle steels horizontally, and fixedly connecting the adjacent ends of the two angle steels through angle steel bolts to form a test angle steel 6;
the vertical section at the left end of the test angle steel 6 is fixedly connected with the side face of the vertical fixing plate 11 of the left side fixing frame 7 in an attaching mode through a plurality of connecting bolts, and the horizontal section at the left end of the test angle steel 6 is fixedly connected with the upper end face of the transverse limiting plate 13 of the left side fixing frame 7 in an attaching mode through a plurality of connecting bolts; the vertical section at the right end of the test angle steel 6 is fixedly connected with the side face of the vertical fixing plate 11 of the right side fixing frame 8 in an attaching mode through a plurality of connecting bolts, and the horizontal section at the right end of the test angle steel 6 is fixedly connected with the upper end face of the transverse limiting plate 13 of the right side fixing frame 8 in an attaching mode through a plurality of connecting bolts; the connecting bolts are high-strength bolts and meet the requirement of test strength.
Step five: controlling the servo actuator 2 to apply displacement load, and obtaining the numerical value of the position load of the test angle steel 6 and the connecting bolt between the two angle steels by using the computer control system 12;
step six: when the load reading of the computer control system 12 is obviously reduced (can be judged by combining with the displacement-load curve of the servo actuator 2), or the test angle steel 6 is observed to have obvious buckling deformation, or the connecting bolt between the two angle steels is sheared to cause that the test cannot be continued, the test is terminated.
In order to effectively ensure that the actual conditions can be truly simulated to obtain an accurate test result, in the fourth step, after the two ends of the test angle steel 6 are respectively connected with the left side fixing frame 7 and the right side fixing frame 8, when the angle steel on the two sides of the bolt connection node is found not to be on the same axis, the height of the support frame A16 in the overturn preventing device 38 is adaptively adjusted until the angle steel on the two sides of the bolt connection node is on the same axis. Therefore, the phenomenon that the angle steels on two sides of the bolt connecting node are not on the same axis due to reasons such as process errors can be prevented, the acting force in the loading process can be more accurately transmitted to the bolt connecting node on the test angle steel, the stability of the test process is further improved, and the accuracy of the test result can be effectively improved.
In the method, the vertical section at the left end of the test angle steel is fixedly connected with the side surface of the vertical fixed plate of the left side fixed frame in an attaching manner, the horizontal section at the left end of the test angle steel is fixedly connected with the upper end surface of the transverse limiting plate of the left side fixed frame in an attaching manner, the vertical section at the right end of the test angle steel is fixedly connected with the side surface of the vertical fixed plate of the right side fixed frame in an attaching manner, and the horizontal section at the right end of the test angle steel is fixedly connected with the upper end surface of the transverse limiting plate of the right side fixed frame in an attaching manner, so that the test angle steel can be conveniently limited downwards, the test angle steel can be more stably and reliably connected with the left side fixed frame and the right side fixed frame, the end part of the test angle steel in the test process can be prevented from overturning, and the accurate and effective action of loading force on a bolt connection node of the test angle steel can be ensured, the accuracy of the test is effectively improved; the adjustable supporting mechanism is arranged below the head of the cylinder barrel of the servo actuator in a supporting mode, the cylinder barrel of the servo actuator can be kept in a horizontal state by matching with a right reaction frame, the lateral deviation of the servo actuator in the test process can be limited, and meanwhile, the fine adjustment of the inclination angle of the cylinder barrel of the servo actuator can be realized; the overturn preventing device is arranged below the right side fixing frame, so that not only can a transverse limiting plate in the right side fixing frame form a rolling type support through a carrier roller, but also the right side fixing frame can be limited to only transversely move in the left-right direction, and the overturn action cannot occur in the test process; the method is simple in operation steps, can quickly and accurately test and analyze the load condition of the angle steel bolt connection node of the power transmission tower, is favorable for truly reflecting the actual bearing capacity of the power transmission tower, can accurately make real evaluation on the performance of the angle steel bolt connection node, and is favorable for eliminating potential safety hazards.
Claims (10)
1. A load test device for a steel angle bolt connection node of a power transmission tower comprises a section steel beam (1), and is characterized by further comprising a left reaction frame (3), a right reaction frame (4), a servo actuator (2), a left fixing frame (7), a right fixing frame (8), an anti-overturning device (38) and an adjustable supporting mechanism (5);
the section steel beam (1) is horizontally arranged on the ground (10); the left reaction frame (3) and the right reaction frame (4) are arranged oppositely left and right, and the lower ends of the left reaction frame and the right reaction frame are fixedly connected to the left part and the right part of the upper end of the section steel beam (1) respectively;
the servo actuator (2) is horizontally arranged on the right side of the space between the left reaction frame (3) and the right reaction frame (4), a cylinder barrel base of the servo actuator is fixedly connected with the left end of the right reaction frame (4), and a telescopic rod end of the servo actuator is arranged opposite to the right end of the left reaction frame (3);
the left side fixing frame (7) and the right side fixing frame (8) are respectively composed of a vertical fixing plate (11) which is vertically arranged, a transverse limiting plate (13) which is vertically connected to one side of the vertical fixing plate (11), and a vertical connecting plate (14) which is vertically connected to one side of the vertical fixing plate (11), and the lower end of the vertical connecting plate (14) is simultaneously and fixedly connected with the upper end face of the transverse limiting plate (13); the left side fixing frame (7) and the right side fixing frame (8) are arranged oppositely left and right, a vertical fixing plate (11) of the left side fixing frame (7) is fixedly connected to the right end of the left side reaction frame (3), and a vertical fixing plate (11) of the right side fixing frame (8) is fixedly connected to a telescopic rod end of the servo actuator (2);
the overturn preventing device (38) is arranged between the right side fixing frame (8) and the section steel beam (1), the overturn preventing device (38) is composed of a fixing base A (15) positioned at the bottom and a supporting frame A (16) connected to the top of the fixing base A (15), and the fixing base A (15) is fixedly connected to the upper end of the section steel beam (1); the supporting frame A (16) mainly comprises two side plates (24) and a carrier roller (22), the two side plates (24) are positioned at the top of the supporting frame A (16), the front side and the rear side of the two side plates are oppositely arranged at the outer sides of the front end edge and the rear end edge of a transverse limiting plate (13) in a right side fixing frame (8), and the inner side surfaces of the two side plates (24) are respectively in sliding fit with the front end edge and the rear end edge of the transverse limiting plate (13) in the right side fixing frame (8) so as to limit that the transverse limiting plate (13) in the right side fixing frame (8) can only transversely move in the left-right direction without turning; the carrier roller (22) is arranged in the middle of the two side plates (24), the front end and the rear end of the carrier roller are respectively rotatably connected with the two side plates (24), and the upper edge of the carrier roller is in rolling fit with the lower end surface of a transverse limit plate (13) in the right side fixing frame (8);
the adjustable supporting mechanism (5) is arranged between the servo actuator (2) and the section steel beam (1), the adjustable supporting mechanism (5) is composed of a fixed base B (39) positioned at the bottom and an L-shaped limiting plate (40) connected to the top of the fixed base B (39), and the fixed base B (39) is fixedly connected to the upper end of the section steel beam (1); the upper end face of the horizontal section of the L-shaped limiting plate (40) is abutted against the lower end of the cylinder head of the servo actuator (2), the side face of the vertical section of the L-shaped limiting plate (40) is abutted against the side face of the cylinder head of the servo actuator (2), and the L-shaped limiting plate (40) is fixedly connected with the cylinder head of the servo actuator (2) and used for preventing the servo actuator (2) from moving laterally.
2. The load test device for the angle steel bolt connection node of the power transmission tower according to claim 1, wherein the fixing base A (15) is composed of a bottom plate A (17), a top plate A (18) and two vertical plates A (19), and bolt holes A (20) are formed in the two ends of the bottom plate A (17) in the front-back direction; the middle part of the top plate A (18) is provided with two bolt holes B at intervals from front to back; the top plate A (18) is horizontally arranged right above the bottom plate A (17), and two sides in the front-back direction of the top plate A are fixedly connected with the bottom plate A (17) through two vertical plates A (19) arranged at intervals;
the supporting frame A (16) further comprises a supporting plate (21) and two long screws A (23), and the supporting plate (21) is horizontally arranged above the top plate A (18); the two long screws A (23) correspondingly penetrate through the two bolt holes B, and the upper side and the lower side of the top plate A (18) of each long screw A (23) are respectively connected with a locking nut A (25) in a threaded fit mode; the upper ends of the two long screws A (23) are fixedly connected with the lower end surface of the support plate (21); the lower end edges of the two side plates (24) are fixedly connected to the upper end face of the support plate (21), and the middle parts of the two side plates are oppositely provided with a pair of mounting holes (26); the front end and the rear end of the carrier roller (22) are respectively rotatably connected into a pair of mounting holes (26).
3. The load test device for the angle steel bolted connection node of the power transmission tower according to claim 1 or 2, wherein the fixing base B (39) is composed of a bottom plate B (41), a top plate B (42) and two vertical plates B (43), and bolt holes F (44) are formed in the two ends of the bottom plate B (41) in the front-back direction; the middle part of the top plate B (42) is provided with a bolt hole G; the top plate B (42) is horizontally arranged right above the bottom plate B (41), and the front end and the rear end of the top plate B (42) are fixedly connected with the bottom plate B (41) through two vertical plates B (43) arranged at intervals;
the center of the lower end of the horizontal section of the L-shaped limiting plate (40) is vertically and fixedly connected with a long screw B (45); the long screw B (45) correspondingly penetrates through the bolt hole G, and the upper side and the lower side of the top plate B (42) are connected with locking nuts B (46) through thread matching.
4. The device for testing load of the angle steel bolted connection node of the power transmission tower as claimed in claim 3, wherein the vertical fixing plates (11) of the left side fixing frame (7) and the right side fixing frame (8) are respectively provided with a plurality of bolt holes E (36), the vertical connecting plates (14) of the left side fixing frame (7) and the right side fixing frame (8) are respectively provided with two rows of longitudinally distributed bolt holes C (27), and the transverse limiting plates (13) of the left side fixing frame (7) and the transverse limiting plates (13) of the right side fixing frame (8) are respectively provided with two rows of longitudinally distributed bolt holes D (28).
5. The load test device for the angle steel bolt connection node of the power transmission tower according to claim 4, wherein the left reaction frame (3) and the right reaction frame (4) are respectively composed of a horizontal connection plate (31), a vertical connection plate (32) and at least two rib plates (33), the lower end of the vertical connection plate (32) is vertically and fixedly connected to the upper end of the horizontal connection plate (31), one end of each rib plate (33) is fixedly connected with the horizontal connection plate (31), and the other end of each rib plate is fixedly connected with the vertical connection plate (32);
6. the load test device for the angle steel bolt connection node of the power transmission tower according to claim 5, wherein a plurality of connection holes A (29) are uniformly formed in the middle of the top end of the section steel beam (1) along the length direction, a plurality of connection holes B (30) are formed in the front side and the rear side of each connection hole A (29), and the section steel beam is fixed on the ground (10) through ground anchor bolts (9) penetrating through the connection holes A (29); a plurality of connecting holes C (34) are formed in the horizontal connecting plate (31) corresponding to the connecting holes B (30); a plurality of connecting holes D (37) are formed in the vertical connecting plate (32); the horizontal connecting plates (31) of the left reaction frame (3) and the right reaction frame (4) are fixedly connected to the section steel beam (1) through high-strength connecting bolts of the connecting holes C (34) and B (30); the vertical fixing plate (11) of the left side fixing frame (7) is fixedly connected to the vertical connecting plate (32) of the left side reaction frame (3) through a high-strength connecting bolt penetrating through the bolt hole E (36) and the connecting hole D (37); the cylinder barrel base of the servo actuator (2) is fixedly connected to the vertical connecting plate (32) of the right reaction frame (4) through a high-strength connecting bolt penetrating through the connecting hole D (37); a bottom plate A (17) of the overturn preventing device (38) is fixedly connected to the section steel beam (1) through a high-strength connecting bolt penetrating through the bolt hole A (20) and the connecting hole B (30); and a bottom plate B (41) of the adjustable supporting mechanism (5) is fixedly connected to the section steel beam (1) through a high-strength connecting bolt penetrating through the bolt hole F (44) and the connecting hole B (30).
7. The device for testing the load of the angle steel bolted connection joint of the power transmission tower according to claim 6, characterized by further comprising a computer control system (12), wherein the computer control system (12) is connected with the servo actuator (2).
8. The device for testing the load of the angle steel bolted connection joint of the power transmission tower as claimed in claim 7, wherein the servo actuator (2) is a 50t servo actuator.
9. A load test method for a power transmission tower angle steel bolt connection node is characterized by comprising the following steps:
the method comprises the following steps: fixing the section steel beam (1) on the ground (10) through an earth anchor bolt (9), and fixedly connecting the left reaction frame (3) and the right reaction frame (4) to the upper end of the section steel beam (1) in a left-right opposite mode;
step two: fixedly connecting a cylinder barrel base of a servo actuator (2) with a vertical connecting plate (32) of a right reaction frame (4), meanwhile, supporting an adjustable supporting mechanism (5) below the cylinder barrel head of the servo actuator (2), enabling a bottom plate B (41) to be fixedly connected to the upper end of a section steel beam (1), and adjusting the height of an L-shaped limiting plate (40) by adjusting the position of a locking nut B (46) relative to a long screw B (45) until the height of the cylinder barrel head of the servo actuator (2) meets the requirement of a test; the overturn preventing device (38) is arranged below the right side fixing frame (8), the bottom plate A (17) is fixedly connected to the upper end of the section steel beam (1), and the height of the support frame A (16) is adjusted by adjusting the position of the locking nut A (25) relative to the long screw A (23) until the carrier roller (22) reaches the position in abutting fit with the lower end face of the transverse limiting plate (13) in the right side fixing frame (8);
step three: the left side fixing frame (7) and the right side fixing frame (8) are oppositely arranged left and right, a vertical fixing plate (11) of the left side fixing frame (7) is fixedly connected to a vertical connecting plate (32) of the left side reaction frame (3), and the vertical fixing plate (11) of the right side fixing frame (8) is fixedly connected to the left end of a telescopic rod end of the servo actuator (2);
step four: arranging two angle steels horizontally, and fixedly connecting the adjacent ends of the two angle steels through angle steel bolts to form a test angle steel (6);
the vertical section at the left end of the test angle steel (6) is fixedly connected with the side surface of the vertical fixing plate (11) of the left side fixing frame (7) in an attaching manner through a connecting bolt, and the horizontal section at the left end of the test angle steel (6) is fixedly connected with the upper end surface of the transverse limiting plate (13) of the left side fixing frame (7) in an attaching manner through a connecting bolt; the vertical section at the right end of the test angle steel (6) is fixedly connected with the side surface of the vertical fixing plate (11) of the right side fixing frame (8) in an attaching mode through a connecting bolt, and the horizontal section at the right end of the test angle steel (6) is fixedly connected with the upper end surface of the transverse limiting plate (13) of the right side fixing frame (8) in an attaching mode through a connecting bolt;
step five: controlling the servo actuator (2) to apply displacement load, and obtaining the numerical value of the position load of the test angle steel (6) and the connecting bolt between the two angle steels by using a computer control system (12);
step six: when the load reading of the computer control system (12) is obviously reduced, or the test angle steel (6) is observed to have obvious buckling deformation, or the connecting bolt between the two angle steels is sheared to cause that the test cannot be continued, the test is terminated.
10. The method for testing the load of the angle steel bolted connection node of the power transmission tower according to claim 9, wherein in the fourth step, after the two ends of the tested angle steel (6) are respectively connected with the left side fixing frame (7) and the right side fixing frame (8), when the angle steel at the two sides of the bolted connection node is found to be not on the same axis, the height of the support frame A (16) in the overturn prevention device (38) is adaptively adjusted until the angle steel at the two sides of the bolted connection node is on the same axis.
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