JP2018096772A - Shock experimenting device, and shock experimenting method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a shock experimenting device and a shock experimenting method that can readily change the impact force without altering the inclination or the overall length of the ramp and enable a plumb bob to hit the impact receiving face of the real anti-stone fall structure in a right-angle direction.SOLUTION: A shock experimenting device is equipped with a running pallet 20 having a mounting face 25 parallel to the running face of a ramp 10, a plumb bob 30 on whose bottom part 33 a latching rod 31 is disposed, a plumb bob holding release mechanism that detachably holds a plumb bob 30 and sudden braking means for the running pallet 20 disposed in the terminal part of a horizontal stop section 12; when the running pallet 20 is traveling in an accelerating section 11, the plumb bob 30 is held by the running pallet 20 with the plumb bob holding release mechanism, when the running pallet has reached the terminal part of the horizontal stop section; and when the terminal part of the horizontal stop section is reached, the sudden braking means applies abrupt breaking to the running pallet 20, and the plumb bob holding release mechanism releases the latching rod 31 from holding by the plumb bob 30.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an impact test apparatus and an impact test method for evaluating impact resistance performance of a rockfall countermeasure structure such as a protective fence, a protective net, and a protective wall.

Various rockfall countermeasure structures have been proposed, and each component is designed with the design method of the rockfall countermeasure handbook as a guideline for commercialization.
The impact resistance performance of a rock fall countermeasure structure is known by a calculation technique, a technique obtained by a demonstration experiment in which a weight or the like collides with the actual rock fall countermeasure structure, and a technique using both of these techniques.

When conducting a demonstration experiment, the following methods are known as collision methods of weights.
<1> Falling type A weight that has been freely dropped from a high position on the ground to the bottom is made to collide with a falling stone countermeasure structure that is horizontally positioned on the ground.
<2> Pendulum type A weight suspended via a suspension rope is caused to make a pendulum movement and collide with a falling rock countermeasure structure standing on the ground.
<3> Falling-off type Falling stone countermeasure structure in which a spherical weight falls from the height of the ramp along a guide groove that is continuously formed with a uniform width at the center of the ramp, and stands at the lowest position of the ramp It is made to collide with a thing (patent document 1).

JP 2002-296165 A

The conventional experimental method has the following problems.
<1> In the falling type, the installation direction of the falling rock countermeasure structure is limited to the horizontal direction.
For this reason, when a rockfall countermeasure structure is used in a vertical orientation, for example, a rockfall protection fence, only the protection net excluding the support is the subject of the experiment. Is difficult to do.
The <2> pendulum type is not suitable for experiments on a falling rock countermeasure structure for large-scale impacts because there is a certain restriction on the impact force that can be generated.
Furthermore, the weight must be separated from the suspension rope immediately before the collision of the falling rock countermeasure structure, but the separation timing is likely to vary. If the timing of separation is shifted, the collision direction and impact force will fluctuate and the reproducibility of impact experiments will be reduced.
<3> In the falling type in which the weight is dropped along the guide groove of the ramp, a high sphericity is required for the weight, and the weight cost is high.
<4> Further, in the fall type, there is a restriction on the total length of the ramp, so that it is necessary to increase the weight by increasing the diameter of the weight in order to increase the impact force.
If a guide groove with a fixed groove width on the ramp is replaced with a weight of a different diameter, the compatibility with the groove width will deteriorate, so the impact force may be changed using a weight of a different diameter. difficult.
<5> In the falling type, as a method of changing the impact force, if the traveling wheels are directly assembled to a plurality of weight bodies having different sizes, the weight is caused to travel without being restricted by the groove width of the guide groove. It is possible.
On the other hand, it is difficult to design a wheel satisfying the stability and straightness of the running posture while supporting a large weight with respect to the spherical weight, and the weight cost is very high.

  The present invention has been made in view of the above points. The object of the present invention is to easily change the impact force without changing the gradient and the overall length of the ramp, and to receive the actual object of the falling rock countermeasure structure. An object of the present invention is to provide an impact experiment device and an impact experiment method capable of colliding a weight in a direction perpendicular to the surface.

The present invention has an inclined road in which a sloped acceleration section and a horizontal stop section are continuously formed, and a weight is horizontally placed on a falling rock countermeasure structure installed on the extension of the horizontal stop section of the slope. An impact test device for collision, which has a mounting surface parallel to the traveling surface of the ramp, a traveling pallet capable of traveling along the traveling surface of the ramp, and a locking rod at the bottom, A weight mounted with its bottom portion in contact with the mounting surface of the traveling pallet, a weight holding / releasing mechanism provided on the traveling pallet for detachably holding the weight, and a terminal portion of the horizontal stop section The weight holding and releasing mechanism is capable of holding or releasing the weight with respect to the weight locking rod, and the traveling pallet during traveling in the acceleration section. The weight mounted on the vehicle is held by the weight holding and releasing mechanism and travels. When the let reaches the end of the horizontal stop section, the sudden braking means suddenly brakes the traveling pallet, and the weight holding and releasing mechanism releases the weight from the locking rod. Features.
In another embodiment of the present invention, a plurality of weights having different weights can be mounted on the placement surface of the traveling pallet via the weight holding and releasing mechanism.
In another embodiment of the present invention, the weight holding / releasing mechanism has an engaging / disengaging lever pivotally supported on a traveling pallet, and the engaging / disengaging lever is mechanical, electromagnetic, electric, or fluid cylinder type. It is comprised by any one of these so that rotation is possible.
In another aspect of the present invention, the sudden braking means of the traveling pallet includes a shock absorber having a shock absorbing function and an impact projection that can come into contact with the shock absorber, and the shock absorber is a horizontal stop section or It is attached to either one of the traveling pallets, and the impact projection is attached to either the horizontal stop section or the traveling pallet.
In another embodiment of the present invention, the weight is a polyhedron, a sphere, or a bullet.
In another embodiment of the present invention, a recess is formed at the bottom of the weight, and a locking rod is attached horizontally inside the recess.
In another aspect of the present invention, the rock fall prevention structure is a protective fence, a protective net, or a protective wall having a capturing function and an impact absorbing function.
Furthermore, the present invention has an inclined road in which a sloped acceleration section and a horizontal stop section are continuously formed, and a mounting surface parallel to the traveling surface of the inclined road, along the traveling surface of the inclined road. A traveling pallet capable of traveling, a weight provided on the bottom with a locking rod, the bottom mounted on the mounting surface of the traveling pallet, and installed on the extension of the horizontal stop section of the ramp The rock fall countermeasure structure has an impact test method that is performed by causing a weight to collide horizontally with the rock fall countermeasure structure, and the traveling pallet holds or holds the weight locking rod. A weight holding / releasing mechanism that can be released, and a sudden braking means for the traveling pallet provided at the end of the horizontal stop section, and the weight mounted on the traveling pallet during the traveling of the acceleration section The travel pallet is held by a weight holding and releasing mechanism, and the end of the horizontal stop section When the weight is reached, the weight holding and releasing mechanism is released from holding the weight, and the weight that protrudes horizontally from the end of the horizontal stop section collides with the receiving surface of the falling rock countermeasure structure. It is characterized by that.
In another embodiment of the present invention, a plurality of weights having different weights can be mounted on the placement surface of the traveling pallet via the weight holding / releasing mechanism to change the impact force.

The present invention has at least one of the following effects.
<1> The impact force can be easily changed by changing the weight of different weights onto the traveling pallet without changing the slope and overall length of the ramp, and at a right angle to the receiving surface of the falling rock countermeasure structure. The weight can be made to collide with a desired impact force.
<2> Since the desired impact force can be applied to the actual structure of the falling rock countermeasure structure, the performance and behavior of the falling rock countermeasure structure can be accurately obtained as compared with the conventional experimental method.
<3> Since the mounting surface of the traveling pallet is parallel to the traveling surface of the ramp, the weight can be discharged in the horizontal direction from the end of the horizontal stop section of the ramp.
<4> The bottom plane of the weight is in contact with the plane of the loading pallet, and the weight holding and releasing mechanism holds the locking rod at the bottom of the weight, maintaining the stable posture of the weight. The traveling pallet can be driven at a high speed.
<5> Since it is a simple structure in which a locking rod is simply installed at the bottom of the weight, the cost of the weight can be kept low.

Model diagram of impact test equipment Overall perspective view of traveling pallet and weight A perspective view of the traveling pallet viewed from the bottom side Vertical sectional view of the bottom of the weight and the locking part of the traveling body let Sectional view of VV in FIG. Longitudinal sectional view at the bottom of the weight and the locking part of the traveling body let when locking is released Model diagram of impact test equipment during collision of weight

  Embodiments of the present invention will be described with reference to the drawings.

<1> Outline of Impact Test Apparatus Referring to FIG. 1, the impact test apparatus tests the performance and behavior of the rock fall countermeasure structure 50 by causing the weight 30 to collide with the fall rock countermeasure structure 50 horizontally. The slope 10 formed by the acceleration section 11 having a slope and the horizontal stop section 12 are continuously formed, the traveling pallet 20 that can travel along the slope 10, and the mounting surface 25 of the traveling pallet 20. A weight 30 that is provided on the traveling pallet 20 and that holds the weight 30 in a detachable manner, and a quick braking means for the traveling pallet 20 provided in a horizontal stop section of the ramp. It has.

The placement surface 25 of the travel pallet 20 is parallel to the travel surface of the ramp 10.
The weight holding / releasing mechanism holds the weight 30 placed on the traveling pallet 20 during traveling in the acceleration section, and the weight 30 placed on the traveling pallet 20 when reaching the end of the horizontal stop section 12. It is configured so that it can be released and released horizontally.

The traveling pallet 20 can be lifted to the upper side of the ramp 10 by, for example, a known hoisting machine 16 provided at the top of the ramp 10.
The main components of the impact experiment apparatus will be described in detail below.

<2> Slope The slope 10 has an acceleration section 11 to which a predetermined gradient θ is given and a horizontal stop section 12 continuously formed on the extension of the acceleration section 11, and is a natural slope or support. It is formed on the gantry.
The connection portion between the terminal end of the acceleration section 11 and the start end of the horizontal stop section 12 has a gentle curved shape so that the traveling pallet 20 can smoothly move.
Although not shown, a horizontal standby section may be extended at the top of the acceleration section 11 in some cases.
In this example, a mode in which the traveling pallet 20 travels along a plurality of rails 13 arranged in parallel at a predetermined interval over the entire length of the ramp 10 will be described. However, the rail 13 is not essential, and the traveling pallet 20 Any structure that can travel straight on the traveling surface of the ramp 10 may be used.

<2.1> Acceleration section The acceleration section 11 is an acceleration section of the traveling pallet 20, and the total length thereof is appropriately selected.
The gradient θ of the acceleration section 11 is appropriately selected in consideration of the entire length of the acceleration section 11 and the like.
In this example, the acceleration section 11 is formed linearly, but may be curved in a gentle arc shape.
In the impact experiment device, the gradient θ of the acceleration section 11 constituting the ramp 10 and the total length of the acceleration section 11 are unchanged (constant), and weights 30 of different sizes and weights are mounted on the traveling pallet 20 under this assumption. Then, I changed the impact force.

<2.2> Horizontal Stop Section The horizontal stop section 12 is a section in which the traveling pallet 20 is suddenly braked to separate the weight 30 from the traveling pallet 20.
An end portion of the horizontal stop section 12 is provided with an emergency braking means for the traveling pallet 20 and an operation cam 15 for mechanically separating the weight 30 mounted on the traveling pallet 20.

<2.2.1> Traveling Pallet Sudden Braking Means In this example, a case where the sudden braking means of the traveling pallet 20 is a shock absorber 14 having a buffer function will be described.
As the buffer body 14, for example, a fluid damper capable of contraction deformation, an elastically deformable material such as rubber or a spring, a plastically deformable material, or the like can be applied.
When the shock absorber 14 is a fluid damper, a single or a plurality of dampers are arranged along the rail direction in the horizontal stop section 12 and combined with a receiving protrusion 23 that protrudes downward from the bottom of the traveling pallet 20. use. The fluid damper can suddenly brake the traveling pallet 20 by the fluid resistance when the receiving projection 23 collides with the tip of the fluid damper and contracts and deforms.

<2.2.2> Other Rapid Braking Means In this example, an impact projection 23 is provided on the traveling pallet 20 side and a shock absorber 14 is provided on the horizontal stop section 12 side. The shock absorbers 23 may be provided on the horizontal stop section 12 side.
Further, as other braking means of the traveling pallet 20, for example, a braking device (braking device) is provided on the wheel 22 of the traveling pallet 20, or fluid such as water or highly viscous oil is stored in the horizontal stop section 12. In addition, the traveling pallet 20 can be braked rapidly using the deformation resistance of the fluid.
The braking means for the traveling pallet 20 may be any means that can suddenly stop the traveling pallet 20 in the horizontal stop section 12.

<3> Traveling Pallet Describing with reference to FIGS. 2 and 3, the traveling pallet 20 includes a pallet main body 21 having a mounting surface 25 parallel to the ramp 10, a plurality of wheels 22 equipped on the pallet main body 21, A receiving protrusion 23 projecting downward from a part of the pallet main body 21 and an engaging / disengaging lever 40 pivotally supported at the center of the pallet main body 21 are provided.

<3.1> Pallet body The pallet body 21 is a carriage having a traveling function in which a steel plate or the like is attached to the upper surface of a rigid frame body in which steel materials are assembled into a square shape, and is stable even when a heavy weight 30 is mounted. It is possible to go straight in posture.

<3.2> Wheels The pallet body 21 is provided with a plurality of wheels 22 that can travel on the rails 13.
The plurality of wheels 22 may be idling, but may be driven so that the traveling speed can be controlled.

<3.3> Receiving projection A receiving projection 23 projects downward from the front or bottom of the pallet body 21.
The receiving projection 23 is provided at a position and height where it can collide with the shock absorber 14 disposed in the horizontal stop section 12.

<3.4> Weight Holding / Release Mechanism The weight holding / releasing mechanism is a mechanism capable of holding and releasing (holding release) the weight 30 mounted on the placement surface 25 of the traveling pallet 20. It is assembled to the department.

The weight holding / releasing mechanism of this example will be described with reference to FIGS.
The weight holding / releasing mechanism of this example includes an engaging / disengaging lever 40 pivotally supported on the pallet main body 21 and an operation cam 15 protruding from the horizontal stop section 12 of the ramp 10. The case where the holding tool 31 attached to the bottom 33 of the weight 30 is mechanically held and released will be described.

<3.4.1> Engaging / disengaging lever A support shaft 41 is attached to the center of the pallet main body 21 in a direction perpendicular to the traveling direction of the traveling pallet 20, and one or more engaging / disengaging members are attached to the supporting shaft 41. An intermediate part of the lever 40 is pivotally supported. The engagement / disengagement lever 40 is rotatable about the support shaft 41 along the traveling direction of the pallet body 21 (or the inclination direction of the inclined path 10).
A hook portion 43 having a lateral opening 42 that can be locked to the locking rod 31 of the weight 30 is formed on an upper portion of the engagement / disengagement lever 40 protruding upward from the placement surface 25 of the pallet main body 21.
An abutting portion 44 capable of colliding with the operation cam 15 is formed in the lower half portion of the engagement / disengagement lever 40 protruding downward from the lower surface of the pallet main body 21.
The engagement / disengagement lever 40 can be engaged with the engagement rod 31 of the weight 30 in a state in which the upper hook portion 43 protrudes upward from the placement surface 25.
The engagement / disengagement lever 40 can be released from the engagement with the engagement rod 31 by rotating in the direction in which the hook 43 is retracted into the pallet body 21.
When a plurality of engagement / disengagement levers 40 are attached to the same support shaft 41, the engagement / disengagement operation with the engagement rod 31 by the plurality of engagement / disengagement levers 40 is synchronized.

<3.4.2> Operation Cam An operation cam 15 capable of rotating the engagement / disengagement lever 40 protrudes from a part of the horizontal stop section 12.
The operation cam 15 is made of a hard protrusion such as concrete or metal protruding from the floor surface of the horizontal stop section 12, and is provided at a position where it does not interfere with the receiving protrusion 23.

<4> Weight In the present invention, the weight 30 having a different size and weight can be mounted on one traveling pallet 20 by using a common locking structure for the weight 30 in order to cope with a change in impact force. It was configured as follows.
The weight 30 is a three-dimensional heavy object exhibiting a polyhedron, a sphere, and a bullet body. For example, the entire outer periphery of a concrete block is covered with a hard plate such as a steel plate. The weight 30 may be only a concrete block or a metal block, or may be a structure in which a filler such as earth and sand is enclosed in a metal outer shell.
In this example, the case where the weight 30 is a polyhedron having a plurality of polygonal surfaces 32 will be described.
The bottom portion 33 of the weight 30 is formed with a concave portion 34 that accommodates the upper portion of the engagement / disengagement lever 40 and allows rotation, and a locking rod 31 is attached to the inside of the concave portion 34 in a horizontal direction.
In this example, the case where the locking bar 31 is provided on the bottom 33 (polygonal surface) that contacts the mounting surface 25 will be described. However, the locking bar 31 may be provided on the polygonal surface 32 adjacent to the bottom 33.
Since it is a simple structure which installs the latching rod 31 in the bottom part 33 of the weight 30, the cost of the weight 30 can be held down low.

<5> Rock fall countermeasure structure On the extension line of the horizontal stop section 12, a rock fall countermeasure structure 50 to be tested is erected.
The falling rock countermeasure structure 50 includes a protective fence, a protective net, a protective wall, or the like having a capturing function and a shock absorbing function.

[experimental method]
Next, an experiment method using an impact experiment apparatus will be described.

<1> Mounting of weight The bottom 33 of the weight 30 is mounted in contact with the mounting surface 25 of the traveling pallet 20 using a crane or the like.
At this time, after the locking rod 31 of the weight 30 is directed in the direction orthogonal to the traveling direction of the traveling pallet 20 and the hook portion 43 of the engaging / disengaging lever 40 is accommodated in the recess 34, the engaging / disengaging lever 40 is illustrated. 4, the opening 42 of the hook portion 43 is locked to the locking rod 31.

<1.1> Mounting Position of Weight The mounting position of the weight 30 on the traveling pallet 20 is performed in the horizontal stop section 12 of the ramp 10 shown in FIG. For example, it is pulled up to a predetermined height by a known winder provided at the top of the ramp 10.
The mounting position of the weight 30 is not limited to the flat stop section 12, and may be performed in the middle of the acceleration section 11 or in the uppermost horizontal standby section of the acceleration section 11.

<1.2> Holding Weight In FIG. 4, when the traveling pallet 20 is positioned in the acceleration section 11 having a gradient, the weight 30 tends to slide down due to the inclination of the mounting surface 25. The plane of the bottom 33 of the weight 30 is in contact with the plane of the mounting surface 25 of the traveling pallet 20, and the hook 43 of the engagement / disengagement lever 40 holds the locking rod 31 of the bottom 33 of the weight 30. Therefore, the stable posture of the weight 30 can be maintained.

<2> Accelerated Travel of Traveling Pallet When traveling pallet 20 travels from a predetermined height in acceleration section 11, traveling pallet 20 travels straight along acceleration section 11.
As described above, the bottom 33 of the weight 30 and the mounting surface 25 of the traveling pallet 20 are in contact with each other, and the engagement / disengagement lever 40 continues to hold the bottom 33 of the weight 30. Accordingly, even when the mounting surface 25 is inclined, the high-speed traveling is possible while preventing the weight 30 from falling.

<3> Separation of weight When the accelerated traveling pallet 20 reaches the horizontal stop section 12 via the acceleration section 11, the pallet 20 shifts from the forward tilt position to the horizontal position. With the horizontal posture of the traveling pallet 20, the placement surface 25 also becomes horizontal.
When the traveling pallet 20 reaches the end of the horizontal stop section 12, when the abutment portion 44 of the engagement / disengagement lever 40 protruding from the lower surface of the travel pallet 20 collides with the operation cam 15, the engagement / disengagement lever 40 engages the weight 30. The weight 30 is separated from the traveling pallet 20 by rotating in the direction of releasing the lock with the stop rod 31.

<4> Rapid braking of the traveling pallet Simultaneously with or immediately after the separation of the weight 30, the receiving projection 23 of the traveling pallet 20 collides with the buffer body 14 provided in the horizontal stop section 12, and the traveling pallet 20 is suddenly braked. The

<5> Horizontal jumping of weight When the traveling pallet 20 is suddenly braked, only the weight 30 jumps horizontally at high speed due to inertia.
The weight 30 that protrudes horizontally has a predetermined speed and impact force.
The weight 30 that has jumped out from the end of the ramp 10 collides in a direction perpendicular to the receiving surface of the falling rock countermeasure structure 50.
FIG. 7 shows a state in which the weight 30 has collided in a direction perpendicular to the receiving surface of the rock fall prevention structure 50.
As described above, since a predetermined impact force can be applied to the receiving surface of the falling rock countermeasure structure 50 in a direction perpendicular to the receiving surface, the performance and behavior of the falling rock countermeasure structure 50 should be accurately tested. Can do.

Here, there is a contrast that is configured by inclining the mounting surface 25 by a gradient θ with respect to the pallet main body 21 so that the mounting surface 25 becomes horizontal when the traveling pallet 20 is positioned in the acceleration section 11. It is done.
In the case of this proportionality, the mounting surface 25 is horizontal during traveling in the acceleration section 11 in which the traveling pallet 20 is inclined, but there is a problem that the risk of dropping the weight 30 increases in proportion to the traveling speed.
Furthermore, in this proportionality, when the traveling pallet 20 reaches the horizontal horizontal stop section 12, there is a problem that the mounting surface 25 is inclined backward and the weight 30 cannot be discharged horizontally.
In the present invention, the mounting surface 25 of the traveling pallet 20 is formed in parallel with the traveling surface of the ramp 10 in order to eliminate such a problem that the comparison includes.

<6> Change of impact force When it is desired to change the impact force against the falling rock countermeasure structure 50, the weight 30 having a different size and weight is used.
Even if the weight 30 is different in size and weight, the bottom 33 has a common locking structure. Therefore, the impact force can be applied only by replacing the weight 30 having a different size and weight on the mounting surface 25 of the same traveling pallet 20. Can change.
Thus, the impact force can be freely changed without changing the traveling pallet 20 or the ramp 10 at all.

[Other examples]
In the following, other embodiments will be described. In the description, the same parts as those in the above-described embodiments are denoted by the same reference numerals, and detailed description thereof will be omitted.

<1> Unlocking direction by engagement / disengagement lever In the previous embodiment, the form in which the engagement between the hook portion 43 and the engagement rod 31 can be released by rotating the engagement / disengagement lever 40 counterclockwise was described. However, the engagement between the hook 43 and the engagement rod 31 may be released by rotating the engagement / disengagement lever 40 clockwise.

<2> Other Weight Holding / Release Mechanism The weight holding / releasing mechanism is not limited to the mechanical type using the engaging / disengaging lever 40 and the engaging / disengaging lever 40 described above.
As other rotating means of the engagement / disengagement lever 40, for example, an electromagnetic type using electromagnetic force, an electric type interlocked with a motor, or a cylinder type combined with a fluid cylinder that performs a stroke motion can be applied.

10 .... Ramp 11 ...... Ramp acceleration section 12 ... Ramp horizontal stop section 13 ... Rail 14 ... Buffer 15 ... Operation cam 20 ... ... Traveling pallet 21 ... Pallet body 22 ... Wheel 23 ... Impact projection 25 ... Mounting surface 30 ... Weight 31 ... Locking rod 32 .... Polygonal surface 33 ... Bottom 34 ... Recess 40 ... Engagement lever 41 ... Support shaft 42 ... Opening 43 ... Hook 44 ...・ Abutting part 50 ・ ・ ・ ・ Rock fall countermeasure structure

Claims (9)

An impact experiment in which a slope is formed by a continuous acceleration section and a horizontal stop section with a slope, and a weight collides horizontally with a falling rock countermeasure structure installed on the extension of the horizontal stop section of the slope. A device,
A traveling pallet having a mounting surface parallel to the traveling surface of the ramp and capable of traveling along the traveling surface of the ramp;
A locking rod is provided at the bottom, and a single weight or a plurality of weights different in weight are mounted with the bottom contacting the mounting surface of the traveling pallet;
A weight holding and releasing mechanism provided on the traveling pallet and holding the weight in a detachable manner;
A sudden braking means for the traveling pallet provided at the end of the horizontal stop section,
The weight holding and releasing mechanism can be held or released with respect to the weight locking bar,
During traveling in the acceleration section, the weight mounted on the traveling pallet is held by the weight holding and releasing mechanism,
When the traveling pallet reaches the end of the horizontal stop section, the traveling pallet is suddenly braked by the sudden braking means, and the holding of the weight with the locking rod is released by the weight holding and releasing mechanism. Characterized by the
Impact experiment equipment.   The impact testing apparatus according to claim 1, wherein a plurality of weights having different weights can be mounted on the mounting surface of the traveling pallet via the weight holding / releasing mechanism.   The weight holding / releasing mechanism has an engaging / disengaging lever pivotally supported on the traveling pallet, and the engaging / disengaging lever is rotated by any one of a mechanical type, an electromagnetic type, an electric type, or a fluid cylinder type. The impact test apparatus according to claim 1, wherein the impact test apparatus is configured to be possible.   The sudden braking means for the traveling pallet includes a shock absorber having a shock absorbing function and a receiving projection that can come into contact with the shock absorbing body, and the shock absorber is attached to either the horizontal stop section or the traveling pallet. The impact test apparatus according to claim 1, wherein the impact projection is attached to either the horizontal stop section or the traveling pallet.   The impact experiment apparatus according to claim 1, wherein the weight is a polyhedron, a sphere, or a bullet.   6. The impact experiment apparatus according to claim 1, wherein a concave portion is formed at a bottom portion of the weight, and a locking rod is attached horizontally inside the concave portion.   The impact test apparatus according to claim 1, wherein the falling rock countermeasure structure is a protective fence, a protective net, or a protective wall having a capturing function and an impact absorbing function. A traveling pallet having an inclined road in which a sloped acceleration section and a horizontal stop section are continuously formed, and a mounting surface parallel to the traveling surface of the inclined road, which can travel along the traveling surface of the inclined road And a plurality of weights of different weights mounted on the bottom with a locking bar provided on the bottom, the bottom being in contact with the mounting surface of the traveling pallet, and an extension of the horizontal stop section of the ramp A rock fall countermeasure structure installed on the rock fall countermeasure structure, and the impact test method of the rock fall countermeasure structure performed by causing a weight to collide horizontally with the rock fall countermeasure structure,
The travel pallet is a weight holding and releasing mechanism capable of holding or releasing the holding rod of the weight,
A sudden braking means for the traveling pallet provided at the end of the horizontal stop section,
During traveling in the acceleration section, the weight mounted on the traveling pallet is held by the weight holding and releasing mechanism,
When the traveling pallet reaches the end of the horizontal stop section, the traveling pallet is suddenly braked and the weight holding and releasing mechanism is released and the weight is released from the falling bar. It is characterized by jumping horizontally toward the receiving surface of the structure,
Impact test method for rock fall countermeasure structure.   The rock fall countermeasure structure according to claim 8, wherein the impact force can be changed by mounting a plurality of weights having different weights on the mounting surface of the traveling pallet via the weight holding and releasing mechanism. Shock experiment method.

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