CN109269754B - Cylinder type guiding directional impact device and method for energy dissipater power test in rockfall interception system - Google Patents
Cylinder type guiding directional impact device and method for energy dissipater power test in rockfall interception system Download PDFInfo
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- CN109269754B CN109269754B CN201811311450.7A CN201811311450A CN109269754B CN 109269754 B CN109269754 B CN 109269754B CN 201811311450 A CN201811311450 A CN 201811311450A CN 109269754 B CN109269754 B CN 109269754B
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- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/08—Shock-testing
Abstract
The invention discloses a cylindrical guide directional impact device for an energy dissipater power test in a rockfall interception system and a test method thereof, wherein the cylindrical guide directional impact device comprises an impact block, a hoisting device, a stay cable, a cantilever bracket, a tension sensor, a vertical guide cylinder, a counterforce wall and a foundation pit; the counterforce wall is vertically arranged on one side of the foundation pit. The hoisting equipment pulls the impact block to hover at a certain elevation position in the guide cylinder, releases the impact block to enable the impact block to freely fall along the cavity in the guide cylinder and drives the inhaul cable connected with the cavity, the inhaul cable pulls the energy dissipater test piece to enable the energy dissipater test piece to start, and required test data are obtained through the tension sensor connected with the energy dissipater test piece. The test device can be built in a nearby field, the test field is not limited by the field environment, test equipment does not need to be carried to a steeper cliff during each test, the test cost can be effectively reduced, the working efficiency is improved, and the test device can be repeatedly used.
Description
Technical Field
The invention relates to the technical field of slope protection, in particular to a barrel type guiding directional impact device for a power experiment of a rockfall interception system energy dissipater.
Background
The western terrain of China is high in west and low in east, is distributed in a step shape, has complex and various terrains and wide mountain areas, and mainly shows that the western terrain is mainly mountainous regions, basins and plateaus, and in the terrain areas, the basins are provided with wind erosion terrains; mountainous areas have iced terrains, and Qinghai-Tibet plateaus have frozen soil landforms. With the change of global climate, China has become one of the most serious countries of geological disasters. In view of geological disasters such as rockfall, collapse and the like with large quantities, students and engineers propose various countermeasures and methods, wherein passive flexible protection is a widely used protection technology. The protection effect is determined by the height of the protection performance of the energy dissipater of the protection system, but the domestic test device for detecting the performance of the energy dissipater of the rockfall protection system still stays in a pseudo-static force stage, the influence of a power effect on the energy dissipater cannot be reflected, so that a rockfall impact test is particularly important, the process of simulating the energy dissipater of the rockfall protection system is a good place for the test, and if the technical problem cannot be effectively solved, the dynamic detection test cannot be carried out.
The energy dissipater power test in the same type of foreign rockfall interception systems basically utilizes the existing cliffs to carry out impact pressure test, and has no guide limiting device for guiding an impact block. Meanwhile, the kinetic energy of the impact block cannot be guaranteed to be transmitted to the energy dissipater test piece completely, so that the subsequent stress analysis is difficult, and the life safety of testing personnel is seriously threatened because the track of the impact block is not fixed and potential safety hazards exist.
Disclosure of Invention
In view of the above problems, the present invention aims to provide a test apparatus which is built nearby and can reduce the pressure test cost, improve the test efficiency, effectively transmit the impact effect and reduce the potential safety hazard. The technical scheme is as follows:
a cylinder type guiding directional impact device for a dynamic test of an energy dissipater in a rockfall interception system comprises:
the impact block is used for generating impact kinetic energy, and a lifting ring is arranged at the top of the impact block;
a foundation pit which provides a buffer space for an impact test and plays a role in protection is provided, and a conical protection pit is arranged at the bottom of the foundation pit;
the reaction wall right above the conical pit is provided with vertical guide cylinders, the vertical guide cylinders are of a segmented structure, and the sections of the vertical guide cylinders and the base of the vertical guide cylinders are fixed with the reaction wall through bolts;
the cantilever supports are fixed with the reaction wall through anchor rods arranged in the anchor holes, the cantilever supports are arranged on two sides of the vertical guide cylinder, the number of the cantilever supports on one side of the vertical guide cylinder is at least two, fixed pulleys are fixed on at least one cantilever support, and energy dissipaters are connected on at least one cantilever support;
the hoisting equipment is used for lifting and releasing the test piece and can suspend the impact block right above the vertical guide cylinder;
the energy dissipater is connected to cantilever supports on two sides of the vertical guide cylinder, and the middle section of the stay cable sequentially bypasses a fixed pulley on one side of the vertical guide cylinder, the hanging ring and a fixed pulley on the other side of the vertical guide cylinder.
Furthermore, the horizontal scale of paint mark is arranged on the wall surface of the reaction wall at the height of 2/3, and the vertical scale of the inverted trapezoid shape of the paint mark is arranged at the bottom of the reaction wall right above the conical protection pit at the bottom of the foundation pit.
Furthermore, a tension sensor is connected to the energy dissipater.
Further, the impact block is a sphere with the diameter of 0.4m-2m and the weight of 0.25t-25 t.
Furthermore, the hoisting equipment adopts a movable gantry crane.
Further, there are 4 outriggers, 2 on each side of the vertical guide cylinder.
Furthermore, the vertical guide cylinder is an 3/4 arc-shaped cylinder, the length of the vertical guide cylinder is 1.5 m/section, the diameter of the vertical guide cylinder is 0.45m-2.05m, the inner side of the cylinder wall is smooth, annular reinforcing keels are uniformly distributed in the vertical direction of the cylinder body, bolt holes are uniformly formed in the keels at the cylinder end, and the keels at the cylinder end are connected with the base and fixed with the reaction wall through the base.
Furthermore, the height of the reaction wall is 30m, the length of the reaction wall is 30m, and the interval of the anchor holes in the transverse and longitudinal directions is 500 mm.
Furthermore, steel rails are arranged on two sides of the foundation pit, and the hoisting equipment can run on the steel rails.
On the other hand, the application also discloses a method for testing the cylinder type guiding directional impact device according to the dynamic test of the energy dissipater of the rockfall protection system, which comprises the following steps:
determining the size and the impact speed of an impact block according to the impact kinetic energy required by the dynamic test of the energy dissipater of the rockfall protection system;
determining the inner diameter, the size and the height of the vertical guide cylinder according to the size and the impact speed of the impact block;
mounting and splicing vertical guide cylinders on the reaction wall right above the conical protection pit at the bottom of the foundation pit, and fixing the sections of the vertical guide cylinders and the base and the reaction wall through bolts;
the left cantilever support is respectively arranged at 500mm positions on two sides of the top of the vertical guide cylinder, the left cantilever support is as close to the vertical guide cylinder as possible under the condition that an anchor hole allows, or is positioned at the inner side of the vertical guide cylinder, the position of a hoisting test block of hoisting equipment is not influenced, friction between a guy cable and the top of the vertical guide cylinder is avoided, the right cantilever support is 500mm lower than the left cantilever support in the vertical direction, and the horizontal distance is more than or equal to the stroke of an energy dissipater of a rockfall protection system;
marking the initial deformation position on the energy dissipater to be installed by using pigment or paint so as to capture the whole deformation process of the energy dissipater through a high-speed camera in the impact process or directly measure the deformation length of the energy dissipater after an impact test;
adopting a shackle to connect the tension sensor, the energy dissipater and the cantilever support into a whole;
the energy dissipater is connected with the stay cable by using the rope clamp, and the stay cable extends out of the energy dissipater on one side and sequentially passes through the fixed pulley on one side, the hanging ring on the test block, the fixed pulley on the other side and the energy dissipater;
lifting the impact block by using lifting equipment to stop at the top of the vertical guide cylinder, remotely controlling and releasing the impact block, enabling the impact block to freely fall along the vertical guide cylinder and impact a stay cable for transmitting impact force, and enabling the stay cable for transmitting the impact force to pull the energy dissipater and the tension sensor to work to measure tension time-course test data of the energy dissipater;
and tracking and capturing the mark points on the energy dissipater test piece by adopting a high-speed camera in the falling process of the impact block, connecting the high-speed camera with data acquisition equipment of the tension sensor, and starting the camera shooting function of the high-speed camera by using a synchronization module to ensure that the obtained tension time-course curve is synchronous with the displacement time-course curve, so that the tension-displacement performance curve of the energy dissipater under the action of dynamic impact is obtained.
The invention has the beneficial effects that: the test device can be built on a nearby site, the reaction wall is used for installing the energy dissipater test piece in the rockfall interception system, the test site is not limited by the environment, test equipment does not need to be carried to a remote cliff during each test, the test cost is low, and the efficiency is high; meanwhile, the energy of the impact block can be completely transmitted to the energy dissipater test piece, so that convenience is brought to subsequent stress analysis, and the potential safety hazard caused by unfixed track of the impact block is also solved; and repeated tests and data acquisition can be conveniently carried out.
In addition, because the discreteness of the dynamic performance test result of the energy dissipater in the rockfall interception system is large, in order to ensure high reliability of the test result, multiple tests are required to obtain an average value as a design basis, and the test can be used for carrying out two dynamic performance tests of the rockfall protection system to a certain extent, so that the test efficiency is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
Fig. 1 is a perspective view of a cylindrical guiding directional impact device for a dynamic test of an energy dissipater in a rockfall interception system according to an embodiment of the present application.
Fig. 2 is a perspective view of a foundation pit and a counterforce wall structure of a cylindrical guide directional impact device for a dynamic test of an energy dissipater in a rockfall interception system according to an embodiment of the present application.
Fig. 3 is a perspective view of a reaction frame of a cylindrical guiding directional impact device for a dynamic test of an energy dissipater in a rockfall interception system according to an embodiment of the present application.
Fig. 4 is a partial schematic view of a model installation of a cylindrical guiding directional impact device for a dynamic test of an energy dissipater in a rockfall interception system according to an embodiment of the present application.
Fig. 5 is a schematic structural diagram of an impact test block of a cartridge type guiding and orienting impact device for a power test of a medium absorber of a rockfall interception system according to an embodiment of the present application.
Fig. 6 is a schematic structural view of a vertical guide cylinder of a cylinder type guiding directional impact device for a dynamic test of an energy dissipater in a rockfall interception system according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1-6, a cylindrical guiding directional impact device for a dynamic test of an energy dissipater in a rockfall interception system according to an embodiment of the present application includes an impact block 1 for simulating rockfall, a hoisting device 2 for lifting and releasing the impact block 1, a guy cable 9 for transmitting impact force, a cantilever support 6 for mounting an energy dissipater 8 and a fixed pulley 7, and is characterized by further including a semi-closed vertical guide cylinder 5 for guiding a test block, a counterforce wall 4 for mounting the cantilever support 6, and a foundation pit 3 for providing a buffer space for the impact test and having a protective effect; the reaction wall 4 is vertically arranged on one side of the foundation pit 3, a semi-closed vertical guide cylinder 5 for guiding test blocks is vertically arranged on the reaction wall 4, preferably, the vertical guide cylinder 5 is an arc cylinder with 3/4 circular arcs, the length of the arc cylinder is 1.5 m/section, the diameter of the arc cylinder is 0.45m-2.05m, the inner side of the cylinder wall is smooth, annular reinforcing keels are vertically and uniformly distributed on the cylinder body, bolt holes are uniformly formed in the cylinder end keels, and the cylinder end keels are connected with the base and fixed with the reaction wall 4 through the base.
The cantilever supports 6 are arranged on the counterforce wall 4 which is 500mm away from the left side and the right side of the top of the vertical guide cylinder 5, the cantilever support 6 on one side of the vertical guide cylinder 5 at least comprises two cantilever supports 6-1 on the left side, a cantilever support 6-3, a cantilever support 6-2, a cantilever support 6-4, the four cantilever supports are the same in structural size, the cantilever support 6-2 is positioned on the cantilever support 6-1, the cantilever support 6-3 is 500mm below the projection of the right side relative to the vertical guide cylinder 5, the cantilever support on the left side is as close to the vertical guide cylinder as possible or positioned on the inner side of the vertical guide cylinder without influencing the position of a hoisting test block of hoisting equipment under the permission of an anchor hole, the friction between a guy cable and the top of the vertical guide cylinder is avoided, the horizontal distance between the two cantilever supports on one side is more than or equal to the stroke, fixed pulleys 7 are fixed on the cantilever support 6-1 and the cantilever support 6-2, and energy dissipaters 8 are connected on the cantilever support 6-3 and the cantilever support 6-4; two ends of the inhaul cable 9 are respectively connected to energy dissipaters 8 connected to the reaction frames 6 on two sides of the vertical guide cylinder 5, the energy dissipaters 8 are connected with tension sensors 10 through shackles, and the middle section of the inhaul cable 9 sequentially passes through a fixed pulley 7 on one side of the vertical guide cylinder 5, a hanging ring on the impact block and a fixed pulley 7 on the other side of the vertical guide cylinder 5.
The reaction wall 4 is provided with anchor holes which are uniformly distributed and penetrate through the reaction wall 4, and one end, close to the reaction wall 4, of the cantilever support 6 is fixed with the reaction wall 4 through anchor rods arranged in the anchor holes.
The hoisting equipment 2 is used for completing installation of the cantilever support 6 and the vertical guide cylinder 5 and lifting of the impact block 1, and the impact block 1 is released through the automatic releasing device after the impact block 1 reaches the height required by the test, so that the impact block can freely fall under the action of the vertical guide cylinder and complete the impact test. Meanwhile, the hoisting equipment 2 can be provided with a group of hooks in a grading manner to meet the use requirements of different impact energies. The maximum height of the hook from the ground of the test site is 30 m; the length of the operation tracks of the hoisting equipment needs to ensure that the hoisting equipment 2 can be used in a test area, and the distance between the operation tracks is 24.5 m. The hoisting equipment 2 adopts a movable gantry crane, and the running track adopts steel rails arranged on two sides of the foundation pit.
The foundation pit 3 and the reaction wall 4 are important components of the impact test device, in order to meet the installation requirements of energy dissipaters 8 with different sizes, the height of the reaction wall 4 above the ground is 30m, the length of the reaction wall 4 is 30m, anchor holes which penetrate through the reaction wall 4 and are uniformly distributed are formed in the reaction wall 4, and the interval of the anchor holes in the transverse and longitudinal directions is 500 mm.
The foundation pit 3 needs to meet the deformation requirement of the energy dissipater in the rockfall interception system under the dynamic test, plays a role in preventing an impact test block from falling to the ground to injure personnel and equipment, and provides an operation field for the installation and the disassembly of various experimental models in addition to the foundation pit 3. The bottom of a foundation pit 3 which often bears the impact of a test block is locally dug deeply to form an inverted cone-shaped protective pit so as to meet the requirement of the maximum deformation of a cylindrical guide directional impact device of an energy dissipater power test in a rockfall interception system under the action of rockfall impact.
The test method of the cylinder type guiding directional impact device for the dynamic test of the energy dissipater of the rockfall protection system established in the market comprises the following steps:
(1) determining the size and the impact speed of the impact block 1 according to the impact kinetic energy required by the dynamic test of the energy dissipater of the rockfall protection system;
(2) determining the inner diameter, the size and the height of the vertical guide cylinder according to the size and the impact speed of the impact block 1;
(3) a vertical guide cylinder 5 is installed and spliced on a counterforce wall 4 right above a conical protection pit at the bottom of a foundation pit 3, and the sections of the vertical guide cylinder 5 and the base and the counterforce wall 4 are fixed through bolts;
(4) the left cantilever support 6 is respectively arranged at 500mm positions of the tops of two sides of the vertical guide cylinder 5, the left cantilever support 6 is close to the vertical guide cylinder as far as possible under the condition that an anchor hole allows, or is positioned at the inner side of the vertical guide cylinder and does not influence the position of a hoisting test block of the hoisting equipment 2, the friction between the stay cable 9 and the top of the vertical guide cylinder 5 is avoided, the right cantilever support 6 is 500mm lower than the left cantilever support in the vertical direction, and the horizontal distance is more than or equal to the stroke of the energy dissipater 8 of the rockfall protection system;
(5) marking the initial deformation position on the energy dissipater to be installed by using pigment or paint so as to capture the whole deformation process of the energy dissipater through a high-speed camera in the impact process or directly measure the deformation length of the energy dissipater after an impact test;
(6) a pull sensor, an energy dissipater 8 and a cantilever support 6 are connected into a whole by adopting a shackle;
(7) the energy dissipater 8 is connected with the stay cable 9 by using the rope clamp, and the stay cable 9 extends out of the energy dissipater 8 on one side and sequentially passes through the fixed pulley 7 on one side, the hanging ring on the test block 1, the fixed pulley 7 on the other side and the energy dissipater 8;
(8) lifting the impact block 1 by using the lifting equipment 2 to stop at the top of the vertical guide cylinder 5, remotely controlling and releasing the impact block 1, enabling the impact block 1 to freely fall along the vertical guide cylinder 5 and impact a stay cable 9 for transmitting impact force, enabling the stay cable 9 for transmitting impact force to pull the energy dissipater 8 and the tension sensor to work, and measuring tension time-course test data of the energy dissipater;
(9) and tracking and capturing the mark points on the energy dissipater test piece by adopting a high-speed camera in the falling process of the impact block, connecting the high-speed camera with data acquisition equipment of the tension sensor, and starting the camera shooting function of the high-speed camera by using a synchronization module to ensure that the obtained tension time-course curve is synchronous with the displacement time-course curve, so that the tension-displacement performance curve of the energy dissipater under the action of dynamic impact is obtained.
Specifically, in one embodiment of the present application, the impact block 1 is a sphere having a diameter of 0.4m to 2m and a weight of 0.25t to 25 t. In order to facilitate the impact block 1 to be lifted to a specified height and then pull the stay cable to fall under the constraint of the vertical guide cylinder, a hanging ring for lifting and connecting the stay cable is embedded in the manufacturing process of the impact block 1.
Due to the adoption of the free-fall mode, the calculation formula of the impact energy is as follows:
E＝mgh
wherein m is the mass of the impact block 1; g is the acceleration of gravity; h is the height of the free fall of the impact test block. And during the test, selecting the impact block 1 with the corresponding weight according to the designed impact energy, and setting the corresponding lifting height.
The content that needs to be tested in the test is the deformation and damage condition of the energy dissipater 8 under different energy impact, which specifically comprises the following steps: 1) the starting force of the energy dissipater; 2) dynamic working tension of the energy dissipater; 3) elongation of the dissipater.
The method is characterized in that a camera is adopted to measure the deformation of a test model, and 3 cameras are needed in each test, wherein the 3 cameras comprise 2 high-speed cameras (mainly used for recording the speed of an impact block and the deformation and damage conditions of a damper test piece) and 1 common camera (mainly used for recording the overall deformation and overall damage conditions of the test model). In addition, the energy dissipater is also connected with a tension sensor. And tracking and capturing the mark points on the energy dissipater test piece by adopting a high-speed camera in the falling process of the impact block, wherein the high-speed camera is connected with data acquisition equipment of the tension sensor, and a camera shooting function of the high-speed camera is started by using a synchronization module so as to ensure that the obtained tension time-course curve is synchronous with the displacement time-course curve, thereby obtaining the tension-displacement performance curve of the energy dissipater under the action of dynamic impact.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A cylinder type guiding directional impact device for a dynamic test of an energy dissipater in a rockfall interception system is characterized by comprising:
the impact block (1) is used for generating impact kinetic energy, and a lifting ring is arranged at the top of the impact block (1);
a foundation pit (3) which provides a buffer space for an impact test and plays a role in protection, wherein a conical protection pit is arranged at the bottom of the foundation pit (3);
the reaction wall (4) is vertically arranged on one side of the foundation pit (3), anchor holes with the distance of 500mm × 500mm are formed in the reaction wall (4), vertical guide cylinders (5) are arranged on the reaction wall (4) right above the conical protection pit, the vertical guide cylinders (5) are of a segmented structure, and the segments of the vertical guide cylinders (5) and the base of the vertical guide cylinders (5) and the reaction wall (4) are fixed through bolts;
the cantilever supports (6) are fixed with the reaction wall (4) through anchor rods arranged in anchor holes, the cantilever supports (6) are arranged on two sides of the vertical guide tube (5), the number of the cantilever supports (6) on one side of the vertical guide tube (5) is two, a fixed pulley (7) is fixed on one cantilever support (6), and an energy dissipater is connected to the other cantilever support (6);
the hoisting device (2) is used for lifting and releasing the test piece, and the hoisting device (2) can suspend the impact block (1) right above the vertical guide cylinder (5);
the energy dissipation device comprises a stay cable (9) used for transferring impact force, wherein two ends of the stay cable (9) are respectively connected to energy dissipaters (8) connected to cantilever brackets (6) on two sides of a vertical guide cylinder (5), and the middle section of the stay cable (9) sequentially bypasses a fixed pulley (7) on one side of the vertical guide cylinder (5), passes through a hanging ring and bypasses the fixed pulley (7) on the other side of the vertical guide cylinder (5);
the cantilever support (6) on the left side of the vertical guide cylinder (5) is close to the vertical guide cylinder (5) as far as possible under the condition allowed by the anchor hole, the friction between the stay cable (9) and the top of the vertical guide cylinder (5) is avoided, and the horizontal distance between the two cantilever supports (6) on one side is larger than or equal to the stroke of the energy dissipater.
2. The cylinder type guiding and directional impacting device for the energy dissipater power test in the rockfall interception system according to claim 1, wherein a horizontal scale marked with paint is arranged on the wall surface of the counterforce wall (4) at the height of 2/3, and a vertical scale marked with paint and in an inverted trapezoid shape is arranged at the bottom of the counterforce wall (4) right above the conical protection pit at the bottom of the foundation pit (3).
3. The cylinder type guiding directional impact device for the dynamic test of the energy dissipater in the rockfall interception system according to claim 1 or 2, characterized in that the energy dissipater (8) is connected with a tension sensor (10).
4. The cylinder guide directional impact device for the dynamic test of energy dissipaters in rockfall interception systems according to claim 1 or 2, characterized in that said impact block (1) is a sphere with a diameter of 0.4m-2m and a weight of 0.25t-25 t.
5. The cylinder type guiding directional impact device for the dynamic test of the energy dissipater in the rockfall interception system according to claim 1 or 2, wherein the hoisting equipment (2) adopts a movable gantry crane.
6. The cylinder guided directional impact device for dynamic testing of energy dissipaters in rockfall interception systems according to claim 1 or 2, characterized by 2 vertical guides (5) per side.
7. The cylinder type guiding directional impact device for the energy dissipater dynamic test in the rockfall interception system according to claim 1 or 2, wherein the vertical guide cylinder (5) is an 3/4 arc-shaped cylinder with a length of 1.5 m/section and a diameter of 0.45m-2.05m, the inner side of the cylinder wall is smooth, annular reinforcing keels are vertically and uniformly distributed on the cylinder body, bolt holes are uniformly formed in the keel at the cylinder end, and the keel at the cylinder end is connected with a base and fixed with a counterforce wall (4) through the base.
8. The cylinder type guiding and directional impacting device for the dynamic test of energy dissipaters in the rockfall intercepting system according to claim 2, wherein the height of the counterforce wall (4) is 30m, the length of the counterforce wall is 30m, and the interval of the anchor holes in the transverse and longitudinal directions is 500 mm.
9. The cylinder type guiding and directional impacting device for the energy dissipater power test in the rockfall interception system according to claim 1 or 2, wherein rails are arranged on two sides of the foundation pit (3), and the hoisting equipment (2) can run on the rails.
10. A method of testing a cartridge guided directional impact device for dynamic testing of energy dissipaters in rockfall interception systems according to any of claims 1 to 9, comprising the steps of:
(1) determining the size and the impact speed of the impact block (1) according to the impact kinetic energy required by the dynamic test of the energy dissipater of the rockfall protection system;
(2) determining the inner diameter, the size and the height of the vertical guide cylinder according to the size and the impact speed of the impact block (1);
(3) vertical guide cylinders (5) are installed and spliced on the reaction wall (4) right above the conical protection pit at the bottom of the foundation pit (3), and the sections of the vertical guide cylinders (5) and the base and the reaction wall (4) are fixed through bolts;
(4) cantilever supports (6) are respectively installed at 500mm positions of the tops of two sides of a vertical guide cylinder (5), the cantilever support (6) on the left side is close to the vertical guide cylinder as far as possible under the condition that an anchor hole allows, friction between a stay cable (9) and the top of the vertical guide cylinder (5) is avoided, the cantilever support (6) on the right side is lower than the cantilever support (6) on the left side by 500mm in the vertical direction, and the horizontal distance is more than or equal to the stroke of a falling rock protection system energy dissipater (8);
(5) marking the initial deformation position on the energy dissipater to be installed by using pigment or paint so as to capture the whole deformation process of the energy dissipater through a high-speed camera in the impact process or directly measure the deformation length of the energy dissipater after an impact test;
(6) a tension sensor (10), an energy dissipater (8) and a cantilever support (6) are connected into a whole by adopting a shackle;
(7) the energy dissipater (8) is connected with the stay cable (9) by using the rope clamp, and the stay cable (9) extends out of the energy dissipater (8) on one side and sequentially passes through the fixed pulley (7) on one side, the hanging ring on the impact block (1), the fixed pulley (7) on the other side and the energy dissipater (8);
(8) lifting the impact block (1) by using the lifting equipment (2) and stopping the impact block (1) at the top of the vertical guide cylinder (5), remotely controlling and releasing the impact block (1), enabling the impact block (1) to freely fall along the vertical guide cylinder (5) and impact an inhaul cable (9) for transmitting impact force, enabling the inhaul cable (9) for transmitting the impact force to pull the energy dissipater (8) and a tension sensor to work, and measuring tension time-course test data of the energy dissipater;
(9) and tracking and capturing the mark points on the energy dissipater test piece by adopting a high-speed camera in the falling process of the impact block, connecting the high-speed camera with data acquisition equipment of the tension sensor, and starting the camera shooting function of the high-speed camera by using a synchronization module to ensure that the obtained tension time-course curve is synchronous with the displacement time-course curve, so that the tension-displacement performance curve of the energy dissipater under the action of dynamic impact is obtained.
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| CN104990814A (en) * | 2015-06-23 | 2015-10-21 | 哈尔滨工程大学 | Impact test device and test method for nuclear power station U-shaped pole type anti-flinging piece |
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