Test simulation device for fracturing seated collapse type tower-column-shaped dangerous rock

Abstract

The invention discloses a test simulation device for fracturing base collapse type tower-column-shaped dangerous rock in the technical field of dangerous rock collapse, and the device comprises a supporting plate, a six-degree-of-freedom assembly is hinged to the top wall of the supporting plate, a base plate is hinged to the top of the six-degree-of-freedom assembly, a case is fixedly connected to the top wall of the rear part of the base plate, and a display controller is fixedly connected to the bottom of the side wall of the case. A push rod assembly, an acid spraying assembly and a hydraulic machine are sequentially arranged in the machine box from bottom to top, a plurality of hooks are fixedly connected to the top walls of the three sides of the periphery of a pressing plate, facing the lower portion, of the hydraulic machine, anchor net assemblies are hung on the hooks, and all the assemblies and the hydraulic machine are in signal connection with a display controller. According to the dangerous rock collapse simulation device, the simulation structures for different dangerous rock collapse influence factors and the anchor net for monitoring the internal and external parameters of dangerous rock collapse are arranged, so that relatively simulated dangerous rock collapse simulation and monitoring are realized, and detailed test data support is provided for researching dangerous rock collapse disasters.

Description

Technical Field

[0001] The invention belongs to the technical field of dangerous rock collapse, and in particular is a test simulation device for fracturing seat collapse tower column-shaped dangerous rocks. Background Art

[0002] As a common geological disaster, the collapse of dangerous rocks may cause secondary disasters, such as mudslides, debris flows, etc., directly or indirectly destroying infrastructure, causing economic losses in water and land transportation, and causing major dangers to the safety of life and property of residents nearby or along the way. Therefore, it is crucial to prevent and predict disasters caused by the collapse of dangerous rocks. The factors that affect the stability of dangerous rocks can be roughly divided into three categories: 1. The geological lithology, geological landforms and deadweight load of dangerous rocks; 2. The physical and chemical effects of the environment, such as precipitation, acid corrosion, etc.; 3. The influence of external forces on dangerous rocks, such as earthquake loads. In the simulation process of dangerous rock collapse test, the more comprehensive the factors considered for specific environmental conditions, the more convincing the results of dangerous rock collapse simulation will be.

[0003] The existing dangerous rock collapse test simulation equipment is difficult to realize the multi-factor coupling simulation function, and the monitoring data type is single, especially the monitoring of dynamic indicators such as the natural frequency and impact force of the dangerous rock mass is insufficient.

[0004] Therefore, it is necessary to propose a test method for dangerous rock collapse under the influence of multiple factors, and a test simulation device for fracturing seat collapse tower column dangerous rock with the function of monitoring the internal natural vibration frequency and rock cuttings impact during dangerous rock collapse. Summary of the invention

[0005] In order to solve the above problems, the purpose of the present invention is to provide a test simulation device for fracturing seat-collapse tower-shaped dangerous rocks, which realizes the comprehensive influence test of multiple factors on dangerous rocks through a hydraulic press, a push rod assembly, a six-free assembly and an acid injection assembly, and monitors the internal natural vibration frequency of the dangerous rock and the impact force caused by the collapse of the dangerous rock through sensors fixed on the anchor net on the surface of the dangerous rock, thereby realizing a more realistic simulation and monitoring of the collapse of the dangerous rock, and providing more real and detailed data support for the study of dangerous rock collapse disasters.

[0006] In order to achieve the above-mentioned purpose, the technical scheme of the present invention is as follows: a test simulation device for fracturing seat-collapse tower column-shaped dangerous rocks, including a support plate, a six-free component hinged on the top wall of the support plate, a base plate hinged on the top of the six-free component, a chassis fixedly connected to the rear top wall of the base plate, a display controller fixedly connected to the bottom of the side wall of the chassis, a push rod assembly, an acid spray assembly and a hydraulic press are arranged in sequence inside the chassis from bottom to top, the hydraulic press extends to the upper front of the base plate with a pressure plate facing downward, and a plurality of hooks are fixedly connected to the top walls on three sides of the pressure plate facing downward, an anchor net assembly is hung on the hook, and the anchor net assembly hangs down to the front top wall of the base plate, and each assembly and the hydraulic press are connected to the display controller signal.

[0007] The principle of the basic scheme is: place the test rock mass in front of the base plate, use the display controller to set the test conditions, the hydraulic press presses the test rock mass to simulate the deadweight load of the dangerous rock, the push rod assembly provides the water pressure in the cracks between the tower-shaped dangerous rock and the parent rock according to the shape of the test rock mass, the acid spraying assembly sprays acidic solution to simulate the acid rain erosion effect with the assistance of the anchor net assembly to retain water, and the six-freedom assembly shakes the base plate in three dimensions to simulate the effect of earthquake on the dangerous rock. Under the influence of these factors, the dangerous rock is gradually damaged and deteriorated to collapse. In this process, the natural frequency data of the dangerous rock and the impact mechanical effect formed during the collapse can be monitored by the anchor net assembly fixed on the surface of the dangerous rock, and the stress changes in various parts of the rock mass and the mechanism of the collapse effect caused during the collapse of the dangerous rock can be deeply tested.

[0008] The beneficial effects of the basic scheme are: 1. The hydraulic press can be used to pressurize the test rock mass to provide continuous simulation of the dangerous rock's own weight load, and it can be applied simultaneously with other influencing factors to study the coupling damage mechanism of dangerous rock collapse factors, thereby enhancing the authenticity of the research simulation.

[0009] 2. By using the multiple elastic balls of the push rod assembly to contact the irregular surface of the test rock mass, the fissure water pressure between the tower-shaped dangerous rock and the parent rock can be simulated more realistically, thereby providing a more complete simulation of the factors affecting the collapse of the dangerous rock and enhancing the persuasiveness of the test results.

[0010] 3. The acid spraying component sprays acidic solution to simulate the erosion of dangerous rocks by acid rain. Combined with the auxiliary water retention effect of the anchor net component, the water-induced weakening effect at the bottom of the tower-shaped dangerous rock is simulated, so that the environment of the test rock mass is more consistent with the environment of the real tower-shaped dangerous rock, thereby improving the credibility of the test results.

[0011] 4. The six-freedom components provide a three-dimensional shaking effect for the base plate, completely simulating the impact of earthquakes on tower-shaped dangerous rocks. Combined with other components, it can realize the coupling test research on the collapse of dangerous rocks by multiple factors, expanding the scope of research on the collapse of tower-shaped dangerous rocks.

[0012] 5. By fixing the anchor net assembly on the surface of the test rock mass and monitoring the changes in the natural frequency of the test rock collapse deep inside the test rock mass, an accurate model of the natural frequency changes of tower-shaped dangerous rocks can be established and applied to real tower-shaped dangerous rocks to predict the stability of dangerous rocks and the time of dangerous rock collapse, thus promoting the improvement and optimization of tower-shaped dangerous rock early warning technology.

[0013] 6. By monitoring the direction, scale and impact intensity of rock collapse through anchor net components, we can study the disintegration phenomenon of tower-shaped dangerous rocks during fracturing and collapse, and further understand the impact dynamics mechanism of tower-shaped dangerous rock collapse disasters.

[0014] Furthermore, the anchor net assembly includes an anchor net, and the intersection points of the anchor net are fixedly connected with anchor net rings, some anchor net rings serve as monitoring points, and the anchor net rings serving as monitoring points are fixedly connected with sensor nails, and the sensor nails are provided with natural frequency sensors inside and the sensor nails are wedged into the test rock mass.

[0015] The beneficial effect of the basic scheme is that by wedging the sensor nails into the test rock mass, the anchor net assembly can monitor the changes in the natural frequency of the test rock mass before and during collapse, providing accurate data support for building a vibration dynamics model of tower-shaped dangerous rocks and promoting the development of early warning technology for tower-shaped dangerous rocks.

[0016] Furthermore, the sensor nail comprises a nail cover, the bottom wall of the nail cover is fixedly connected to the nail body, and both sides of the bottom wall of the nail cover are fixedly connected to elastic clips with openings facing downwards for clamping the anchor net ring.

[0017] The beneficial effects of the basic scheme are: the sensor nail can be fixedly connected to the anchor net ring through the elastic clip, thereby enhancing the fit between the anchor net and the test rock surface, and enhancing the accuracy of the pressure sensor between the anchor net ring in monitoring the impact mechanics of the debris flow caused by the collapse of the test rock.

[0018] Furthermore, a pressure sensor is provided in the hole formed by the intersection of the anchor nets, and the edge of the pressure sensor is fixedly connected to the nearest four anchor net connecting rings.

[0019] The beneficial effects of the basic scheme are: monitoring the impact force of the test rock collapse through pressure sensors can provide data support for the prevention and control of concurrent disasters formed after the collapse of the tower-shaped dangerous rock, including data such as the scope, direction and impact force of the rock fall. The pressure sensor fills the holes in the anchor net and is connected to the anchor net ring to enhance the structural strength and durability of the anchor net, thereby improving the practicality of the test simulation device. The falling rocks generated by the collapse of the test rock will also be intercepted by the anchor net assembly to prevent them from rushing out of the device and injuring people, thereby improving the safety of the test.

[0020] Furthermore, the upper layer of the anchor net is made of nylon, and the lower layer of the anchor net is made of cotton that can absorb water.

[0021] The beneficial effects of the basic scheme are: through the water absorption of the lower cotton anchor net, the acid spraying component is provided with a water retention function, and the flowing acidic solution is gathered at the bottom of the tower-shaped dangerous rock, simulating the effect of real tower-shaped dangerous rock being eroded by acid rain, and enhancing the persuasiveness of the test results.

[0022] Furthermore, the acid spray assembly includes a liquid storage tank, which is connected to a liquid filling pipe and leads to the outside world. The other end of the liquid storage tank is connected to a liquid outlet pipe, which is connected to a water pump. The other end of the water pump is connected to a spray pipe, which extends to the anchor net above the front of the substrate and forms a frame shape. The nozzle of the spray pipe faces the anchor net.

[0023] The beneficial effects of the basic scheme are: through the liquid filling pipe and liquid storage tank of the acid spray component, the staff can prepare solutions of different acidity for testing and construct a test gradient. The annular spray pipe ensures that the test rock mass in the center can fully withstand the acid water shower, reducing the influence of other unnecessary factors, thereby reducing errors and improving the accuracy of dangerous rock collapse tests.

[0024] Furthermore, the push rod assembly includes a plurality of electric push rods, a plurality of electric push rod housings are arranged in parallel and fixedly connected to the inside of the chassis, the electric push rod bodies extend outward to the front of the substrate, and elastic balls are fixedly connected to the tops of the electric push rod bodies.

[0025] The beneficial effect of the basic scheme is that through an electric push rod array composed of a number of electric push rods and an elastic ball at the top of the push rod, the push rod assembly can provide an effect simulation of water pressure accumulation in the fissures of tower-shaped dangerous rocks on the uneven inner surface of the test rock mass, thereby increasing the comprehensiveness of the test device and improving the authenticity of the dangerous rock collapse test.

[0026] Furthermore, the six-freedom assembly includes six electric cylinders, the bottoms of the electric cylinder housings are hinged to the top wall of the support plate, and the tops of the electric cylinder rod bodies are hinged to the bottom wall of the base plate.

[0027] The beneficial effect of the basic scheme is that the six-freedom assembly composed of six electric cylinders can provide lateral and longitudinal shaking of earthquakes for the dangerous rock collapse test, thereby simulating the vibration effect of the earthquake, broadening the types of factors in the dangerous rock collapse test, and improving the authenticity of the dangerous rock collapse test.

[0028] Furthermore, the four corners of the bottom wall of the base plate are hinged with stabilizing cylinder rod bodies, and the bottom of the stabilizing cylinder shell is hinged with the four corners corresponding to the top wall of the support plate.

[0029] The beneficial effect of the basic solution is that the structural strength is strengthened by the hinged installation of the stabilizing cylinder while the base plate and the support plate are movable, thereby improving the durability and life of the entire test device.

[0030] Furthermore, baffles are vertically fixedly connected to the three side edges of the front portion of the top wall of the base plate away from the push rod assembly.

[0031] The beneficial effect of the basic scheme is: a substrate groove is formed at the front of the substrate through baffles vertically fixed on three sides of the front of the top wall of the substrate, so that the acid solution sprayed by the acid spraying assembly can be retained in the substrate groove, achieving the acid immersion effect on the bottom of the test rock mass, enhancing the test work effect of this factor, and reducing the waste of acid solution materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is an isometric diagram of a test simulation device for fracturing seat-collapse tower columnar dangerous rocks in an embodiment of the present invention.

[0033] Figure 2 It is a top cross-sectional view of the acid injection assembly of the test simulation device for fracturing seat collapse tower columnar dangerous rock in an embodiment of the present invention.

[0034] Figure 3 It is a top cross-sectional view of the six-freedom components of the test simulation device for fracturing seat-collapse tower columnar dangerous rocks in an embodiment of the present invention.

[0035] Figure 4 It is a schematic diagram of the anchor net assembly of the test simulation device for fracturing the seat collapse tower columnar dangerous rock in an embodiment of the present invention.

[0036] Figure 5 It is a cross-sectional view of a sensor nail of a test simulation device for fracturing a collapsed tower column-shaped dangerous rock in an embodiment of the present invention.

[0037] The figure marks in the drawings of the specification include: support plate 1, electric cylinder 2, stabilizing cylinder 3, base plate 4, baffle 5, anchor net 6, spray tube 7, pressure plate 8, hook 9, hydraulic press 10, elastic ball 11, chassis 12, display controller 13, liquid adding tube 14, liquid storage tank 15, water pump 16, pressure sensor 17, anchor net ring 18, nail body 19, natural frequency sensor 20, nail cover 21, elastic clip 22. DETAILED DESCRIPTION

[0038] The following is further described in detail through specific implementation methods:

[0039] Embodiment 1:

[0040] Basically as attached Figure 1 , Figure 2 , Figure 3As shown: A test simulation device for fracturing seat collapse tower column dangerous rock, including a support plate 1, the top wall of the support plate 1 is hinged with a six-free assembly, the six-free assembly includes six electric cylinders 2, the bottom of the housing of the electric cylinder 2 is hinged with the top wall of the support plate 1. The top of the rod body of the electric cylinder 2 is hinged with a base plate 4; the rear top wall of the base plate 4 is fixedly connected to a chassis 12, the bottom of the side wall of the chassis 12 is fixedly connected to a display controller 13, and the inside of the chassis 12 is sequentially provided with a push rod assembly, an acid spray assembly and a hydraulic press 10 from bottom to top. The push rod assembly includes a plurality of electric push rods, and a plurality of electric push rod housings are arranged in parallel array and fixedly connected to the inside of the chassis 12. The electric push rod body extends outward to the front of the base plate 4, and the top of the electric push rod body is fixedly connected to an elastic ball 11. The acid spraying assembly includes a liquid storage tank 15, which is connected to a liquid adding pipe 14 and leads to the outside. The other end of the liquid storage tank 15 is connected to a liquid outlet pipe, which is connected to a water pump 16. The other end of the water pump 16 is connected to a spray pipe 7, which extends to the upper front of the substrate 4 and around the anchor net 6 to form a frame shape, and the nozzle of the spray pipe 7 faces the anchor net 6; the hydraulic press 10 extends to the upper front of the substrate 4 and the pressure plate 8 faces downward, and the three side top walls around the pressure plate 8 facing downward of the hydraulic press 10 are fixedly connected with a plurality of hooks 9, and the anchor net 6 assembly is hung on the hooks 9, and the anchor net 6 assembly hangs down to the top wall of the front of the substrate 4, and the three side edges of the front of the top wall of the substrate 4 away from the push rod assembly are vertically fixedly connected with a baffle 5, and the four corners of the bottom wall of the substrate 4 are hinged with a rod body of a stabilizing cylinder 3, and the bottom of the shell of the stabilizing cylinder 3 is hinged with the four corners corresponding to the top wall of the support plate 1, and each component and the hydraulic press 10 are connected to the display controller 13 signal.

[0041] The specific implementation process is as follows: before the test, the staff first places the test rock mass in the front center of the substrate 4, and adds the pre-configured acid solution to the liquid storage tank 15 through the liquid adding pipe 14. The liquid adding pipe 14, liquid storage tank 15, liquid outlet pipe, water pump 16, spray pipe 7, substrate 4 and baffle 5 in the acid spraying assembly are all made of acid-resistant and corrosion-resistant materials. Then the display controller 13 is operated to set the load weight, the spraying time of the acid spraying assembly acid solution, the thrust size and position of the push rod assembly, the motion mode and frequency of the six-free assembly, and then the elastic ball 11 of the calibrated push rod assembly is pressed against the irregular surface of the test rock mass, the test device is turned on, and the liquid is started. The press 10 compacts the test rock mass to simulate the deadweight load of the tower-shaped dangerous rock. The acid spray assembly sprays acidic solution through a frame-shaped spray pipe to simulate acid rain. The acidic solution eventually flows into the baffle 5 on the top wall of the substrate 4 to simulate the erosion of the lower layer of the test rock mass by the accumulated water caused by acid rain. The electric push rod of the push rod assembly contacts the test rock mass and applies a thrust from top to bottom from weak to strong to simulate the water pressure of the accumulated water in the cracks of the tower-shaped dangerous rock. The six-freedom assembly simulates the multi-directional shaking of an earthquake. The stabilizing cylinder 3 helps the device to remain stable as a whole, thereby realizing the coupled simulation of multiple influencing factors of dangerous rock collapse (acid erosion, precipitation, deadweight load and earthquake action) and enhancing the authenticity of the dangerous rock collapse simulation test results.

[0042] Embodiment 2:

[0043] The difference from the above embodiment is that the Figure 1 , Figure 4 , Figure 5 As shown: the anchor net assembly includes an anchor net 6, and the intersections of the anchor net 6 are fixedly connected with anchor net rings 18, some of the anchor net rings 18 serve as monitoring points, and the anchor net rings 18 serving as monitoring points are fixedly connected with sensor nails, a natural frequency sensor 20 is arranged inside the sensor nail, and the sensor nail is wedged into the test rock mass, the sensor nail includes a nail cover 21, a nail body 19 is fixedly connected to the bottom wall of the nail cover 21, and elastic clips 22 with downward openings for clamping the anchor net rings 18 are fixedly connected on both sides of the bottom wall of the nail cover 21, a pressure sensor 17 is arranged in the hole formed by the intersection of the anchor net 6, and the edge of the pressure sensor 17 is fixedly connected to the nearest four anchor net rings 18, the upper layer of the anchor net 6 is made of nylon, and the lower layer of the anchor net 6 is made of cotton that can absorb water.

[0044] The specific implementation process is as follows: before starting the dangerous rock collapse test, after setting the test parameters, the staff will surround the three outward sides of the test rock mass with the anchor net assembly and hang the top of the anchor net assembly on the hook 9, wedge the sensor nail into the test rock mass through the anchor net ring 18 selected as the monitoring point, and use the elastic clip 22 to clamp the corresponding anchor net ring 18 to enhance the fit of the anchor net assembly to the surface of the test rock mass and improve the structural strength of the anchor net assembly; after starting the dangerous rock collapse test, the sensor nail continuously monitors the natural frequency of the test rock mass and transmits it to the display controller 13, and the lower layer of the cotton anchor net 6 can absorb the acid solution sprayed by the acid spraying assembly and retain the solution in the lower layer of the test rock mass The surface simulates the erosion of the bottom of the dangerous rock by real acid rain water. When the test rock mass collapses, the debris flow generated by the rock fragmentation hits the pressure sensor 17 in the anchor net assembly. This means that the anchor net assembly can simultaneously monitor the changes in the natural frequency of the test rock mass during the rock mass collapse and the range, direction and impact force of the debris flow, thereby constructing a data model for the changes in the natural frequency during the collapse of the test rock mass and a data model for the debris flow generated by the collapse of the test rock mass, providing data support for predicting the collapse of tower-shaped dangerous rocks in reality. The debris flow generated during the test will also be intercepted by the anchor net assembly to prevent accidents such as the debris flow rushing out of the device and injuring people, thereby improving the safety of the test.

[0045] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0046] The above is only an embodiment of the present invention. The common sense such as the known specific structure and characteristics in the scheme is not described in detail here. The ordinary technicians in the relevant field know all the common technical knowledge in the technical field of the invention before the application date or priority date, can obtain all the existing technologies in the field, and have the ability to apply the conventional experimental means before that date. The ordinary technicians in the relevant field can improve and implement this scheme in combination with their own abilities under the enlightenment given by this application. Some typical known structures or known methods should not become obstacles for ordinary technicians in the relevant field to implement this application. It should be pointed out that for those skilled in the art, without departing from the structure of the present invention, several deformations and improvements can be made, which should also be regarded as the protection scope of the present invention, which will not affect the effect of the implementation of the present invention and the practicality of the patent. The protection scope required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A test simulation device for fracturing a collapsed tower columnar dangerous rock, characterized in that: It includes a support plate, a six-free component is hinged on the top wall of the support plate, a base plate is hinged on the top of the six-free component, the rear top wall of the base plate is fixedly connected to a chassis, the bottom of the side wall of the chassis is fixedly connected to a display controller, and the inside of the chassis is provided with a push rod assembly, an acid spray assembly and a hydraulic press from bottom to top, the hydraulic press extends to the upper front of the base plate with a downward pressure plate, and a plurality of hooks are fixedly connected to the top walls on three sides of the pressure plate facing downward, and an anchor net assembly is hung on the hook, and the anchor net assembly hangs down to the front top wall of the base plate, and each assembly and the hydraulic press are connected to the display controller signal.

2. The test simulation device for fracturing seat-collapse tower columnar dangerous rocks according to claim 1, characterized in that: The anchor net assembly includes an anchor net, and the intersections of the anchor net are fixedly connected with anchor net rings. Some anchor net rings serve as monitoring points, and the anchor net rings serving as monitoring points are fixedly connected with sensor nails. The sensor nails are provided with natural frequency sensors inside and the sensor nails are wedged into the test rock mass.

3. The test simulation device for fracturing seat-collapse tower columnar dangerous rocks according to claim 2, characterized in that: The sensor nail comprises a nail cover, a nail body is fixedly connected to the bottom wall of the nail cover, and elastic clips with downward openings for clamping the anchor net connection ring are fixedly connected to both sides of the bottom wall of the nail cover.

4. The test simulation device for fracturing seat collapse tower columnar dangerous rock according to claim 2, characterized in that: A pressure sensor is arranged in the hole formed by the intersection of the anchor nets, and the edge of the pressure sensor is fixedly connected with the four nearest anchor net connecting rings.

5. The test simulation device for fracturing seat-collapse tower columnar dangerous rocks according to claim 2, characterized in that: The upper layer of the anchor net is made of nylon, and the lower layer of the anchor net is made of water-absorbent cotton.

6. The test simulation device for fracturing seat-collapse tower columnar dangerous rocks according to claim 1, characterized in that: The acid spray assembly includes a liquid storage tank, which is connected to a liquid adding pipe and leads to the outside world. The other end of the liquid storage tank is connected to a liquid outlet pipe, which is connected to a water pump. The other end of the water pump is connected to a spray pipe, which extends to the anchor net above the front of the substrate and forms a frame shape. The nozzle of the spray pipe faces the anchor net.

7. The test simulation device for fracturing a collapsed tower columnar dangerous rock according to claim 6, characterized in that: The push rod assembly includes a plurality of electric push rods, a plurality of electric push rod housings are arranged in parallel and fixedly connected to the inside of the chassis, the electric push rod bodies extend outward to the upper front of the base plate, and the tops of the electric push rod bodies are fixedly connected with elastic balls.

8. The test simulation device for fracturing seat-collapse tower columnar dangerous rocks according to claim 7, characterized in that: The six-freedom assembly comprises six electric cylinders, the bottoms of the electric cylinder housings are hinged to the top wall of the support plate, and the tops of the electric cylinder rod bodies are hinged to the bottom wall of the base plate.

9. The test simulation device for fracturing a collapsed tower columnar dangerous rock according to claim 8, characterized in that: The four corners of the bottom wall of the base plate are hinged with stabilizing cylinder rod bodies, and the bottom of the stabilizing cylinder shell is hinged with the four corners corresponding to the top wall of the supporting plate.

10. The test simulation device for fracturing a collapsed tower columnar dangerous rock according to claim 9, characterized in that: The front part of the top wall of the base plate is vertically fixedly connected with baffles on three side edges away from the push rod assembly.

Images