CN214247362U - Mining scour protection initiative top-contacting spherical energy-absorbing pillar structure and supporting system - Google Patents
Mining scour protection initiative top-contacting spherical energy-absorbing pillar structure and supporting system Download PDFInfo
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- CN214247362U CN214247362U CN202023321344.2U CN202023321344U CN214247362U CN 214247362 U CN214247362 U CN 214247362U CN 202023321344 U CN202023321344 U CN 202023321344U CN 214247362 U CN214247362 U CN 214247362U
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Abstract
The utility model relates to a mining anti-impact active roof-contacting spherical energy-absorbing pillar structure and a supporting system, which comprises a lower supporting body, an upper supporting body and an energy-absorbing sphere; the upper support body is arranged on the lower support body in a sliding manner; the upper support body is provided with a cavity, the energy-absorbing sphere is arranged in the cavity, the top of the energy-absorbing sphere is in contact with the top wall of the cavity of the upper support body, and the bottom of the energy-absorbing sphere is in contact with the top of the lower support body; the lower support body, the upper support body and the energy-absorbing ball body jointly form a pillar structure and support between roadway top and bottom plates. It also relates to a support system comprising a plurality of support structures supported along a roadway. The utility model discloses simple structure, bearing capacity is high, contractibility can be good and cost-effectively.
Description
Technical Field
The utility model belongs to the field is strutted to the colliery tunnel scour protection, concretely relates to mining scour protection initiative meets spherical energy-absorbing pillar structure and supporting system in top.
Background
Along with the increase of coal mining depth in China, the frequency and intensity of rock burst are obviously increased, the whole instability of a roadway supporting structure and casualty accidents are often caused, the existing impact roadway usually adopts a prevention technology of 'strong pressure relief and strong support', common wood supports, metal supports, anchor shotcrete, single hydraulic prop supports and the like are rigid supports, the supporting modes have low supporting strength, high labor intensity and poor safety, the huge impact effect of energy carried by sudden rock burst on a supporting system cannot be met, and supporting materials are often deformed and damaged instantly; the advance hydraulic support has higher protection capability, but has large self weight, is inconvenient to move and large in occupied space due to repeated support of the top plate, and is not as flexible as a single support form. Therefore, the stable control of the rock burst roadway is a problem to be solved urgently in mineral excavation in China, and the invention of the anti-impact support body which is high in bearing capacity, good in contractibility performance and economical in cost is urgent.
SUMMERY OF THE UTILITY MODEL
In order to solve the problem, the utility model provides a mining scour protection initiative connects spherical energy-absorbing pillar structure in top and supporting system provides one kind and has higher working resistance, can reach 4000 + 10000 kN/post, can be contractible fast when rock burst takes place, keeps the pillar bearing capacity not reduce simultaneously, guarantees safe complete in the tunnel space under the impact condition, guarantees equipment and personnel safety.
The purpose of the utility model is realized like this:
a mining anti-impact active roof-contacted spherical energy-absorbing strut structure comprises a lower support body, an upper support body and an energy-absorbing sphere; the upper support body is arranged on the lower support body in a sliding manner; the upper support body is provided with a cavity, the energy-absorbing sphere is arranged in the cavity, the top of the energy-absorbing sphere is in contact with the top wall of the cavity of the upper support body, and the bottom of the energy-absorbing sphere is in contact with the top of the lower support body; the lower support body, the upper support body and the energy-absorbing ball body jointly form a pillar structure and support between roadway top and bottom plates.
The upper support body and the lower support body can be matched in a sliding mode to provide a certain yielding space, meanwhile, the function of early support can be achieved under the resistance action of the energy absorption ball body, only when rock burst occurs, the energy absorption ball body can be quickly contracted, effective support is provided, yielding in the space is achieved, and completeness of a roadway and personnel safety are guaranteed.
The utility model relates to a preferable implementation mode, the upper and lower support columns are steel tube structures, and the inside of the steel tube of the lower support body is filled with slurry; the upper support body is sleeved on the outer wall of the lower support body.
The steel pipe has the advantages of inertia moment, uneasy distortion, high supporting force, capability of meeting the supporting requirement by filling slurry inside, and controllable cost. In addition, FRP pipes can also be used.
The utility model relates to a preferred embodiment, it is provided with the top cap to go up the supporter top, the energy-absorbing spheroid is located between top cap and the under bracing body top.
The roof can be supported on the roof in a large area through the top cover.
The utility model relates to a preferable implementation mode, a slidable steel plate is arranged at the top of the lower support body in the space of the upper support body, a first sealing ring is arranged between the steel plate and the inner wall of the upper support body, and the first sealing ring is fixed on the periphery of the steel plate; the energy-absorbing ball is positioned between the top cover and the steel plate.
Through slidable steel sheet, the inside steel sheet that can jack that fills the thick liquid of bottom suspension body, thereby jack energy-absorbing spheroid drives the support body and struts on the roof under the effect of steel sheet. Enough jacking pressure can be guaranteed through the setting of sealing washer, prevents to leak thick liquid.
The utility model relates to a preferred embodiment, the energy-absorbing spheroid link up and is provided with the exhaust passage, the top of exhaust passage with the exhaust hole intercommunication of top cap, the bottom of exhaust passage with the exhaust hole intercommunication of the steel sheet of lower support body.
The top end of the strut is provided with an exhaust passage which penetrates through the circular steel plate, the energy-absorbing material and the top cover and is used for exhausting gas in the strut cavity during grouting so as to ensure that grouting is more sufficient. The exhaust passage may be of steel pipe construction.
The utility model relates to a preferred embodiment, the energy-absorbing spheroid is rubber, water pocket or hollow metal spheroid.
The rubber, water pocket or hollow metal sphere structure may have better bearing capacity and compressibility.
The utility model relates to a preferable implementation mode, the bottom of the lower supporting body is provided with a shoe plate, the top is provided with a steel plate, and the middle lower part of the steel pipe of the lower supporting body is provided with a grouting hole; the inner filling material of the steel pipe of the lower support body is water, emulsified oil of a mining hydraulic prop or concrete.
Through the top steel plate, the combined action of the shoe plate and the steel pipe realizes a sealing structure, and the slurry can be sealed in the space to form an integrated support.
The utility model relates to a preferable implementation mode, a second sealing ring and a third sealing ring are arranged between the steel pipes sleeved by the upper supporting body and the lower supporting body, and the second sealing ring is fixed at the top of the steel pipe of the lower supporting body; and the third sealing ring is fixed at the bottom of the steel pipe of the upper supporting body.
Prevent through sealed when making slip casting to run the oar, guaranteed the stability of slip casting holding power for support body area pressure roof is taken in the jacking during the slip casting, treats that the thick liquid can continuously provide the holding power after stable.
The utility model relates to a preferred embodiment, evenly be provided with a plurality of post claws on top cap and the shoes board.
Can guarantee through a plurality of column claws that both ends all with the overhead gage in close contact with about the pillar, prevent the pillar stress concentration that leads to because of the unevenness of overhead gage simultaneously.
The utility model discloses still relate to a mining scour protection initiative top-contacting ball-shaped energy-absorbing supporting system, include along a plurality of pillar structures of roadway support, rigid connection between the pillar structure.
The utility model discloses following beneficial effect has at least:
1) the upper support body and the lower support body can be matched in a sliding mode to provide a certain yielding space, meanwhile, the function of early support can be achieved under the resistance action of the energy absorption ball body, only when rock burst occurs, the energy absorption ball body can be quickly contracted, effective support is provided, yielding in the space is achieved, and completeness of a roadway and personnel safety are guaranteed.
2) Through slidable steel sheet, the inside steel sheet that can jack that fills the thick liquid of bottom suspension body, thereby jack energy-absorbing spheroid drives the support body and struts on the roof under the effect of steel sheet. Enough jacking pressure can be guaranteed through the setting of sealing washer, prevents to leak thick liquid.
3) The top end of the strut is provided with an exhaust passage which penetrates through the circular steel plate, the energy-absorbing material and the top cover and is used for exhausting gas in the strut cavity during grouting so as to ensure that grouting is more sufficient.
4) The structure of the rubber, the water bag and the hollow metal sphere has better bearing capacity and compressibility.
5) Through the top steel plate, the combined action of the shoe plate and the steel pipe realizes a sealing structure, and the slurry can be sealed in the space to form an integrated support.
6) Prevent through sealed when making slip casting to run the oar, guaranteed the stability of slip casting holding power for support body area pressure roof is taken in the jacking during the slip casting, treats that the thick liquid can continuously provide the holding power after stable.
7) Can guarantee through a plurality of column claws that both ends all with the overhead gage in close contact with about the pillar, prevent the pillar stress concentration that leads to because of the unevenness of overhead gage simultaneously.
Drawings
FIG. 1 is a schematic view of a prop according to the present invention in an un-jacked state;
FIG. 2 is a schematic view of the prop structure in the jacking state of the present invention;
FIG. 3 is a schematic view of the steady state structure of the support of the present invention;
fig. 4 is the utility model discloses let fast and press back strut structure sketch map.
In the figure, 1-top cover; 2-an energy-absorbing sphere; 3-an upper support; 4-a first sealing ring; 5-a second sealing ring; 6-a lower support; 7-grouting holes; 8-shoe board; 9-an exhaust passage; 10-a steel plate; 11-a third sealing ring; 12-slurry; 13-a crushed energy absorbing sphere; 14-the top plate.
Detailed Description
The present invention will be further explained with reference to the accompanying drawings.
Example one
Fig. 1-4 show schematic views of an embodiment of the food processing assembly of the present invention;
a mining anti-impact active roof-contacted spherical energy-absorbing strut structure comprises a lower support body 6, an upper support body 3 and an energy-absorbing sphere 2; the upper support body 3 is arranged on the lower support body 6 in a sliding way; the upper support body 3 is provided with a cavity, the energy-absorbing sphere 2 is arranged in the cavity, the top of the energy-absorbing sphere 2 is in contact with the top wall of the cavity of the upper support body 3, and the bottom of the energy-absorbing sphere 2 is in contact with the top of the lower support body 6; the lower support body 6, the upper support body 3 and the energy-absorbing ball body 2 jointly form a pillar structure which is supported between the roadway top and the bottom plate.
The upper support body and the lower support body can be matched in a sliding mode to provide a certain yielding space, meanwhile, the function of early support can be achieved under the resistance action of the energy absorption ball body, only when rock burst occurs, the energy absorption ball body can be quickly contracted, effective support is provided, yielding in the space is achieved, and completeness of a roadway and personnel safety are guaranteed.
Specifically, the upper cavity can contain a plurality of energy absorbing spheres.
Specifically, the upper support body 3 may be sleeved outside the lower support body 6, or may be inserted inside the lower support body 6; the cross sections of the upper and lower supporting bodies can be circular with equal moment of inertia and uneasy to twist, and can also be rectangular which is more suitable for bearing unequal bending moments. That is, the upper supporter 3 is a steel pipe having a diameter one larger than that of the lower supporter 6.
Further, the upper and lower support columns are of steel pipe structures, and slurry 12 is poured into the steel pipes of the lower support body 6; the upper support body 3 is sleeved on the outer wall of the lower support body 6.
The steel pipe has the advantages of inertia moment, uneasy distortion, high supporting force, capability of meeting the supporting requirement by filling slurry inside, and controllable cost. In addition, FRP pipes can also be used.
Further, a top cover 1 is arranged at the top of the upper supporting body 3, and the energy-absorbing ball 2 is located between the top cover 1 and the top of the lower supporting body 6.
The energy-absorbing ball 2 can be sealed in the cavity through the top cover 1, and simultaneously, the energy-absorbing ball is supported on the top plate in a large area.
Furthermore, a slidable steel plate 10 is arranged at the top of the lower support body 6 in the space of the upper support body 3, a first sealing ring 4 is arranged between the steel plate 10 and the inner wall of the upper support body 3, and the first sealing ring 4 is fixed on the periphery of the steel plate 10; the energy-absorbing ball 2 is positioned between the top cover and the steel plate.
Through slidable steel sheet, the inside steel sheet that can jack that fills the thick liquid of bottom suspension body, thereby jack energy-absorbing spheroid drives the support body and struts on the roof under the effect of steel sheet. Enough jacking pressure can be guaranteed through the setting of sealing washer, prevents to leak thick liquid.
Specifically, the steel plate 10 is a circular steel plate, the circular steel plate is slightly larger than the outer diameter of the steel pipe of the lower support column, the circular steel plate covers the top end of the steel pipe of the lower support column, and a first sealing ring is fixed on the outer side of the circular steel plate, so that slurry in the lower cavity can be prevented from rushing into the upper cavity. Meanwhile, the sliding seal is formed between the circular steel plate 10 and the inner wall of the steel pipe of the upper supporting body through the first sealing ring, the circular steel plate 10 is jacked when the inner portion of the steel pipe of the lower supporting body is grouted, and the circular steel plate jacking energy-absorbing ball body 2 drives the upper supporting body to jack, so that the roadway top and the bottom plate are supported under pressure.
Furthermore, the energy absorbing sphere 2 is provided with an exhaust passage 9 in a penetrating manner, the top of the exhaust passage 9 is communicated with an exhaust hole (not shown) of the top cover 1, and the bottom of the exhaust passage 9 is communicated with an exhaust hole (not shown) of the circular steel plate 10 of the lower support 6.
The top end of the pillar is provided with an exhaust passage 9 which penetrates through the circular steel plate 10, the energy-absorbing material 2 and the top cover 1 and is used for exhausting gas in a pillar cavity during grouting so as to ensure that grouting is more sufficient. The exhaust duct 9 may be of steel pipe construction.
Further, the energy-absorbing sphere 2 is a rubber, water bag or hollow metal sphere.
The structure of the rubber, the water bag and the hollow metal sphere has better bearing capacity and compressibility.
Specifically, the hollow metal sphere is a sphere formed by buckling and welding two semicircular steel plates into a whole.
Furthermore, a shoe plate is arranged at the bottom of the lower support body 6, a steel plate is arranged at the top of the lower support body, and a grouting hole 7 is formed in the middle lower part of the steel pipe of the lower support body 6; the inner filling material of the steel pipe of the lower support body 6 is water, mining hydraulic prop emulsified oil or concrete.
Through the top steel plate, the combined action of the shoe plate and the steel pipe realizes a sealing structure, and the slurry can be sealed in the space to form an integrated support.
Further, a second sealing ring 5 and a third sealing ring 11 are arranged between the upper supporting body 3 and the lower supporting body 6 which are sleeved on the steel pipe, and the second sealing ring 5 is fixed on the top of the steel pipe of the lower supporting body; and the third sealing ring 11 is fixed at the bottom of the steel pipe of the upper supporting body. That is to say, the second sealing ring 5 is fixed relative to the lower support body, while the third sealing ring 11 can slide and seal with the lifting of the upper support body.
Prevent through sealed when making slip casting to run the oar, guaranteed the stability of slip casting holding power for support body area pressure roof is taken in the jacking during the slip casting, treats that the thick liquid can continuously provide the holding power after stable. After the slurry 12 is filled in the steel pipe of the lower support body, if the upper support body 3 is not connected with the top, the slurry 12 can be continuously filled in the steel pipe beyond the lower support body, the circular steel plate 10 is continuously jacked to ascend, and the excess slurry 12 flows into the cavity between the circular steel plate 10 and the steel pipe of the upper support body until the top is connected, so that the working resistance of 4000 plus 10000 kN/column can be achieved.
Furthermore, a plurality of column claws are uniformly arranged on the top cover 1 and the shoe plate 8.
The upper end and the lower end of the supporting column can be ensured to be in close contact with the top plate and the bottom plate through the plurality of column claws, so that the friction with the top surface and the bottom surface is increased; and simultaneously prevent the stress concentration of the strut caused by the unevenness of the top and bottom plates.
Briefly, the utility model discloses mainly include pillar overall structure and detail structure:
1. integral structure of pillar
The pillar mainly includes upper and lower two sections support columns, and the upper support column cover is outside the lower support column, makes up into whole through the sealing washer, and the main part adopts steel pipe or FRP pipe preparation, according to the form of transmitting power in the tunnel, and the cross-section both can be equal inertia moment, the circular that is not suitable for the distortion and can be more suitable for bearing the rectangle of moment of bending of unequal.
The upper support column comprises a top cover, an exhaust hole, a spherical energy-absorbing material, a round steel plate and a first sealing ring, and the lower support column comprises a second sealing ring, a third sealing ring, a grouting hole and a shoe plate. The upper and lower section columns respectively contain a cavity, slurry is injected into the lower cavity to lift the support column, the slurry is combined with the support column body after being solidified to form a high-strength support body, spherical energy-absorbing materials are placed in the upper cavity, and when the working pressure exceeds the rated pressure, the energy-absorbing materials are compressed and deformed, and the support column realizes transverse resistance deformation.
2. Details of the pillar
The upper supporting column is a steel pipe with the diameter larger than that of the lower supporting column by one, and the top end of the upper joint column is sleeved with the upper supporting column. The bottom is combined with the lower section column into a whole through a third sealing ring; the energy-absorbing material is arranged between the circular steel plate and the top cover and is in a sphere shape formed by buckling and welding two semicircular steel plates into a whole; the circular steel plate is slightly larger than the outer diameter of the lower section column, covers the top end of the lower section column, and is fixed with a first sealing ring at the outer side, so that slurry in the lower cavity can be prevented from being flushed into the upper cavity; the top end of the upper section column is welded with a top cover which is contacted with the roadway, the friction between the top cover and the roadway is increased through column claws, and the lateral pressure bearing capacity of the support column is increased; the top end of the strut is provided with an exhaust hole steel pipe which penetrates through the round steel plate, the energy-absorbing material and the top cover and is used for exhausting gas in the strut cavity during grouting.
The bottom of the lower section column is welded and connected with a shoe plate, four column claws are arranged on the shoe plate, and the friction between the shoe plate and the ground is increased; the middle part is provided with a grouting hole for grouting; and a second sealing ring is fixed on the outer side of the top of the lower section column, so that the sealing performance of the lower cavity during grouting is ensured.
During the use, adopt the jacking method, through the inside high strength slurry that fills of slip casting hole to empty pillar, every notes 50cm, carry out the vibration measurement with the vibrating rod in the pillar outside to guarantee the closely knit degree of slurry, after slurry and lower section post top parallel and level, the upper segment post is raised gradually under the jacking pressure of lower part slurry, stops the slip casting until the pillar reaches and stops the slip casting after predetermined top pressure that connects, shutoff slip casting hole, slip casting in-process, intracavity gas is from top exhaust hole discharge.
Example two:
the utility model discloses still relate to a mining scour protection initiative top-contacting ball-shaped energy-absorbing supporting system, include along a plurality of pillar structures of roadway support, rigid connection between the pillar structure.
When in implementation:
taking a certain coal mine roadway as an example, the construction method of the support comprises the following steps:
1. the hollow steel pipe pillar body, the spherical energy-absorbing material, the pillar top cover and the pillar shoe plate are manufactured on the ground, the energy-absorbing material, the top cover, the circular steel plate and the exhaust holes are assembled into a whole, then the top cover is welded to the top end of the upper section pillar, the grouting holes and the shoe plate are manufactured on the lower section pillar, and the upper section pillar is sleeved with the lower section pillar.
2. And after the assembly, the support is transported to the interior of a roadway, the preset site of the support is leveled, and the support is moved to a preset supporting site at a distance of 0.6-1m from the adjacent support according to the requirement.
3. After a certain hollow support column is installed, high-strength slurry is poured into the hollow support column through a grouting hole by adopting a jacking method, when the grouting is carried out for 50cm, vibration measurement is carried out on the outer side of the support column by using a vibrating rod so as to ensure the compactness of the slurry, and after the slurry is level with the top of a lower section column, an upper section column is gradually raised under the jacking pressure of the slurry at the lower part until the support column reaches the preset top connection pressure, and the grouting hole is blocked.
4. When in normal use, the internal high-strength slurry is combined with the strut shell to form a high-strength support body; when impact earth pressure comes temporarily, huge pressure exceeds the rated bearing value of the strut, the energy absorbing material in the upper section column is compressed and deformed, the strut realizes transverse resistance deformation, and stability of a roadway is guaranteed.
Utility model discloses beneficial effect that technical scheme brought:
1. when no impact load acts, the slurry is in a three-dimensional compression state under the constraint of the column body, the column body and the slurry bear axial pressure together, the stability of the pipe wall is enhanced, and the bearing capacity and the stability of the strut are greatly improved due to the 'symbiotic phenomenon' of the slurry and the column body;
2. the utility model discloses when the impact load effect, the abundant compressive deformation of energy-absorbing material, the pillar realizes that the violently hinders can contract, has guaranteed that the tunnel is stable, after compressing to the limit, the pillar still can exert and strut efficiency, realizes strutting to excelling in of roof, and this pillar simple structure, bearing capacity height, dismantlement simple to operate can effectively cushion and absorb the impact energy, protection tunnel personnel and equipment safety.
3. The utility model discloses arrange the energy-absorbing material in the epicoele internal to a plurality of spherical energy-absorbing materials can be put into to the epicoele cavity, and the material kind also can be different materials such as hollow steel ball, water pocket or rubber, can select suitable energy-absorbing material according to operational environment and the requirement of difference.
4. The utility model discloses lower cavity also can pour into water, mining hydraulic prop emulsified oil or other liquid, under the prerequisite of guaranteeing the bearing capacity, practices thrift the cost.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and it should be understood by those skilled in the art that the embodiments can be modified and improved without departing from the principle and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents, and the modifications and improvements should be considered within the scope of the present invention.
Claims (10)
1. A mining anti-impact active roof-contacted spherical energy-absorbing strut structure is characterized by comprising a lower support body, an upper support body and an energy-absorbing sphere; the upper support body is arranged on the lower support body in a sliding manner; the upper support body is provided with a cavity, the energy-absorbing sphere is arranged in the cavity, the top of the energy-absorbing sphere is in contact with the top wall of the cavity of the upper support body, and the bottom of the energy-absorbing sphere is in contact with the top of the lower support body; the lower support body, the upper support body and the energy-absorbing ball body jointly form a pillar structure and support between roadway top and bottom plates.
2. The mining anti-impact active roof-contacted spherical energy-absorbing strut structure according to claim 1, wherein the upper and lower supporting columns are steel tube structures, and slurry is poured into the steel tubes of the lower supporting body; the upper support body is sleeved on the outer wall of the lower support body.
3. The mining anti-impact active roof-contacted spherical energy-absorbing strut structure as claimed in claim 2, wherein a top cover is arranged at the top of the upper supporting body, and the energy-absorbing sphere is positioned between the top cover and the top of the lower supporting body.
4. The mining impact-proof active roof-contacted spherical energy-absorbing strut structure according to claim 3, wherein a slidable steel plate is arranged at the top of the lower support body in the space of the upper support body, a first sealing ring is arranged between the steel plate and the inner wall of the upper support body, and the first sealing ring is fixed on the periphery of the steel plate; the energy-absorbing ball is positioned between the top cover and the steel plate.
5. The mining anti-impact active roof-contacted spherical energy-absorbing strut structure as claimed in claim 4, wherein an exhaust passage is arranged through the energy-absorbing sphere, the top of the exhaust passage is communicated with the exhaust hole of the top cover, and the bottom of the exhaust passage is communicated with the exhaust hole of the steel plate of the lower supporting body.
6. The mining impact-proof active roof-contacted spherical energy-absorbing strut structure according to claim 1, wherein the energy-absorbing sphere is a rubber, water bag or hollow metal sphere.
7. The mining impact-proof active roof-contacted spherical energy-absorbing strut structure according to claim 2, wherein a shoe plate is arranged at the bottom of the lower support body, a steel plate is arranged at the top of the lower support body, and a grouting hole is formed in the middle lower part of the steel pipe of the lower support body;
the inner filling material of the steel pipe of the lower support body is water, emulsified oil of a mining hydraulic prop or concrete.
8. The mining anti-impact active roof-contacted spherical energy-absorbing strut structure according to claim 4, wherein a second sealing ring and a third sealing ring are arranged between the steel pipe of the upper supporting body and the steel pipe of the lower supporting body, and the second sealing ring is fixed on the top of the steel pipe of the lower supporting body; and the third sealing ring is fixed at the bottom of the steel pipe of the upper supporting body.
9. The mining anti-impact active roof-contacted spherical energy-absorbing strut structure according to claim 4, wherein a plurality of column claws are uniformly arranged on the top cover and the shoe plate.
10. An anti-impact active roof-contacting spherical energy-absorbing supporting system for mining, which is characterized by comprising a plurality of supporting column structures according to any one of claims 1 to 9 supported along a roadway, wherein the supporting column structures are rigidly connected.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202023321344.2U CN214247362U (en) | 2020-12-31 | 2020-12-31 | Mining scour protection initiative top-contacting spherical energy-absorbing pillar structure and supporting system |
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| CN202023321344.2U CN214247362U (en) | 2020-12-31 | 2020-12-31 | Mining scour protection initiative top-contacting spherical energy-absorbing pillar structure and supporting system |
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