CN203475447U - Flexible blocking net - Google Patents
Flexible blocking net Download PDFInfo
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- CN203475447U CN203475447U CN201320530024.9U CN201320530024U CN203475447U CN 203475447 U CN203475447 U CN 203475447U CN 201320530024 U CN201320530024 U CN 201320530024U CN 203475447 U CN203475447 U CN 203475447U
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- flexible
- net
- mesh
- supporting rope
- flexible blocking
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Abstract
The utility model discloses a flexible blocking net and relates to a protective structure. Provided is a flexible blocking net which is capable of optimizing load distribution and reducing local concentrated load. The flexible blocking net comprises at least two support columns, and a support rope and a metal flexible net which are arranged between the support columns in a transverse spreading mode. The support rope is connected with the metal flexible net. At least one end of the support columns in the length direction is connected with a support body capable of rotating freely, and the support body enables the support rope to be tensioned. Further, the flexible blocking net can comprise connection clamping rings variable in shape or easy to break. The metal flexible net comprises meshes. At least one mesh located on a top row or a bottom row of the metal flexible net is connected with the support rope through the corresponding connection clamping ring to form an area with a buffer function, in other words, the area is a buffer area. The flexible blocking net can be used for blocking moving objects, particularly tumbling stones, sliding rock and earth mass, debris flows, snow slide and flying stones.
Description
Technical field
The utility model relates to a kind of protective structure, i.e. a kind of flexible blocking backstop that especially tumbles Rock And Soil, mud-rock flow, snowslide and the blasting flyrock of stone, slip for the moving object of blocking.
Background technology
The net of blocking being formed by various metal flexible nets, supporting rope, support column and pedestal, stay cord and the energy dissipator with overload protective function etc.; because it has good impact resistance and the advantage such as construction and installation are efficient and convenient; construction or the operation protection of the engineerings such as highway, railway, power station have been widely used in; in order to the side slope of blocking, tumble Rock And Soil, mud-rock flow, snowslide and the blasting flyrock etc. of stone, slip, and obtained good result.
At present, known all kinds of blocking in net, the a certain fixed position that is all directly bearing in support column top and bottom or pedestal along the supporting rope of horizontal spreading between each support column is realized connection, when a certain position of certain two adjacent supports intercolumniation of netting when blocking is impacted by moving object, the supporting rope of these two adjacent supports intercolumniations is by stand under load tensioning and deform and displacement, and this stand under load response has the trend of outside transmission, yet, owing to there being larger force of sliding friction between the supporting rope of tensioning and the supporting contact point of support column or pedestal, it outwards transmits and is difficult to smooth and easy realization, the net Local Loads that causes blocking is excessive, reduce its ability of blocking, the existence of this problem makes the known web frame of blocking have improved necessity.In addition, such blocking in net, the all upper lower edge mesh of metal flexible net is all directly to pass these mesh, sew up rope, the same way such as shackle are directly connected with supporting rope, these edge mesh only can be moved on the support ran between two adjacent support columns or pedestal, thereby when the net of blocking is subject to moving object impact, the movement of flexible net is restricted and forms very high concentration of local load near support column top and bottom or pedestal, having reduced the integral body ability of blocking of the net of blocking, as a kind of scheme addressing this problem, the applicant's the patent No. is ZL201220415837.9, name is called the utility model patent of " net of blocking ", a kind of net of blocking is disclosed, it comprises supporting rope and the metal flexible net that launches layout between at least two support columns and support column, also comprise at least one snub rope, snub rope launches and at least strides across a support column along supporting rope, at the bottom of the part or all of top of the part metal flexible net adjacent with snub rope, row edge mesh is slidably connected with snub rope, the mesh of this connection can be crossed over support column or thereby pedestal slip reduces the concentration of local load in this region, and proved that this scheme is effective in actual applications, but this solution by additional cushion rope is except also having simplification and improved prospect, it is not the unique scheme that solves Related Technical Issues.
Utility model content
Can not the larger deficiency of the caused concentration of local load of smooth and easy posting by supporting rope while impacted by moving object in order to overcome the existing net of blocking, provide a kind of in order to reduce near the new technical scheme of the concentration of local load in flexible net support column top and bottom or pedestal, technical problem to be solved in the utility model is to provide a kind ofly can optimize the flexible blocking backstop that load distributes, reduces concentration of local load.
For addressing the above problem the technical scheme of employing, be: flexible blocking backstop comprises supporting rope and the metal flexible net that between at least two support columns and support column, horizontal spreading is arranged, supporting rope is connected with metal flexible net, at least one end of support column length direction is connected with supporting mass free to rotate, supporting mass tensioning supporting rope.
Further: flexible blocking backstop comprises the Joining clasp of shape variable or easy fracture, metal flexible net comprises mesh, it is buffer area that at least one mesh that is positioned at metal flexible net top row or end row is connected to form the ，Gai region, region with pooling feature by Joining clasp and supporting rope.
Concrete: supporting mass comprises fixed body and rotor, is provided with locating slot on rotor, and fixed body is connected with support column, and supporting rope is positioned in locating slot.
Further: mesh in buffer area is all or part of to be connected with supporting rope by Joining clasp; When the mesh part in buffer area is connected with supporting rope by Joining clasp, there is not any direct connection relational in all the other mesh and supporting rope.
As a kind of preferred: Joining clasp is helical spring.
As a kind of preferred: Joining clasp comprises by the bending ring bodies of metal wire rod.
Concrete: Joining clasp comprises fastener and the body of clasp being bent to form by metal wire rod, crosspoint and free segment, fastener connects metal wire rod two parts according to predetermined load at place, crosspoint, and free segment can move when extraneous load surpasses predetermined load in fastener.
Further: the end of free segment is connected with skid-proof device.
As a kind of preferred: metal wire rod bending two ends forms hasp, two mutual hooks of hasp connect.
The beneficial effects of the utility model are: the contact point of supporting rope and rotatable support relatively moves with the less roll mode of frictional resistance, supporting rope or its section of extending laterally of the two support column both sides adjacent with moving object impact position are able to swimmingly to impact position displacement, thereby that transfers flexible blocking backstop widerly shares and transmits load, reduction flexible blocking backstop be hit area peripheral edge Local Loads intensity and be finally delivered to the load on all kinds of anchor poles.
Joining clasp is under load action or when load meets or exceeds predetermined value, can be there is obvious elongation strain, free segment displacement discharges, hasp is threaded off, separated, the modes such as fracture make it encircle all sizes obviously to increase or remove annular enclosed, thereby weaken or remove the connection constraints to row edge mesh at the bottom of the top of coupled metal flexible net, the region that makes to have the connection that Joining clasp cushions of aforementioned feature has obvious load pooling feature, by two adjacent support columns and therebetween four folding corner regions that are easy to produce Load concentration of the supporting rope of horizontal spreading and the unit of blocking that is approximately rectangle that metal flexible net forms formed the buffer area that can avoid this region internal loading concentrations.
In sum, load distribution in flexible blocking backstop of the present utility model has obtained optimization, sharing of impact load is more rational, concentration of local load has obtained reduction, thereby reduced the peak load in each member in flexible blocking backstop, and then improved the whole impact resistance of blocking and netting, reduce the requirement to the anchored force of all kinds of anchor poles, and reduced construction and installation workload and later stage operation maintenance workload.
Accompanying drawing explanation:
Fig. 1 is flexible blocking backstop structural representation;
Fig. 2 is double-deck flexible blocking backstop structural representation;
Fig. 3 is a kind of structure chart of Joining clasp;
Fig. 4 is the another kind of structure chart of Joining clasp;
Fig. 5 is a kind of structure chart of supporting mass;
In figure, be labeled as: metal flexible net 1, support column 2, supporting rope 3, buffer area 4, Joining clasp 5, mesh 6, shackle 7, supporting mass 8, pedestal 9, upper stay cord 10, supporting rope extension 11, layback rope 12, the vertical rope 13 in limit, energy dissipator 14, metal wire rod 15, skid-proof device 16, free segment 17, crosspoint 18, fastener 19, body of clasp 20, hasp 21, rotor 22, fixed body 23, locating slot 24.
The specific embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is further illustrated.
As shown in Figure 1 and Figure 2, flexible blocking backstop of the present utility model can be the known net of blocking that especially tumbles Rock And Soil, mud-rock flow, snowslide and the blasting flyrock of stone, slip for the various moving object of blocking, it comprises supporting rope 3 and the metal flexible net 1 that between at least two support columns 2 and support column 2, horizontal spreading is arranged, supporting rope 3 is connected with metal flexible net 1, at least one end of support column 2 length directions is connected with supporting mass free to rotate 8, supporting mass 8 tensioning supporting ropes 3.Except above-mentioned each component, flexible blocking backstop of the present utility model also can comprise all kinds of anchor poles that hang down other ingredients such as rope 13 and energy dissipator 14 and flexible blocking backstop is anchored in to ground in stay cord 10, supporting rope extension 11, layback rope 12, limit.Support column 2 can comprise support column main body and base 9, and base 9 is fixedly installed, and support column main body is connected with base 9, and supporting mass 8 can be connected with support column body end and/or base 9.In a kind of embodiment shown in Fig. 1 of flexible blocking backstop, adopt the metal flexible net 1 of individual layer, in the another embodiment shown in Fig. 2, adopt double-deck metal flexible net 1.
Supporting rope 3 relatively moves with the less roll mode of frictional resistance with the contact point of supporting mass 8, supporting rope 3 or the supporting rope extension 11 of two support column 2 both sides adjacent with moving object impact position are able to swimmingly to impact position displacement, thereby that transfers flexible blocking backstop widerly shares and transmits load, reduction flexible blocking backstop be hit area peripheral edge Local Loads intensity and be finally delivered to the load on all kinds of anchor poles.
Further: flexible blocking backstop comprises the Joining clasp 5 of shape variable or easy fracture, metal flexible net 1 comprises mesh 6, it is buffer area 4 that at least one mesh 6 that is positioned at metal flexible net 1 top row or end row is connected to form the ，Gai region, region with pooling feature by Joining clasp 5 and supporting rope 3.And mesh 6 use shackles 7 in row edge at the bottom of the top of metal flexible net 1 beyond buffer area 4, sew up to restrict or directly wear the usual manners such as extension and be slidably connected with adjacent supports rope 3.The mesh 6 at the row edge, top beyond the buffer area 4 of Fig. 1 and the metal flexible net 1 shown in Fig. 2 is all connected with upper support rope 3 with shackle 7, and the mesh 6 at row edge, the end employing is directly worn the connected mode hanging on lower support rope 3.In the backstop of flexible blocking shown in Fig. 2 embodiment, adopt the shape approximation rhombus of the metal flexible net 1(mesh 6 that plays time carrying effect in double-level-metal flexible net 1) buffer area 4 beyond top at the bottom of the mesh 6 at row edge all adopts directly to wear and hangs over another and organize the connected mode on supporting rope 3.
Joining clasp 5 is under load action or when load meets or exceeds predetermined value, can be there is obvious elongation strain, free segment 17 displacements discharge, hasp 21 is threaded off, separated, the modes such as fracture make it encircle all sizes obviously to increase or remove annular enclosed, thereby weaken or remove the connection constraints to the mesh 6 at row edge at the bottom of the top of coupled metal flexible net 1, the Joining clasp 5 that makes to have aforementioned feature cushions the region connecting and has obvious load pooling feature, by two adjacent support columns 2 and therebetween four folding corner regions that are easy to produce Load concentration of the supporting rope 3 of horizontal spreading and the unit of blocking that is approximately rectangle that metal flexible net 1 forms formed the buffer area 4 that can avoid this region internal loading concentrations.
Concrete in actual applications, supporting mass 8 comprises fixed body 23 and rotor 22, is provided with locating slot 24 on rotor 22, and fixed body 23 is connected with support column 2, and supporting rope 3 is positioned in locating slot 24.Supporting mass 8 can be the pulley that can buy on market, or fixed body 23 and rotor 22 be all the part of manufacturing voluntarily, and fixed body 23 and rotor 22 can be to be slidably matched also bearing to be set between the two.The effect of locating slot 24 is to prevent that supporting rope 3 from skidding off.
According to the structure design of flexible blocking backstop, especially it adopts the type of metal flexible net 1 and the difference that protective capacities requires thereof, and all or part of Joining clasp 5 that passes through of mesh 6 in buffer area 4 is connected with supporting rope 3; When mesh 6 parts in buffer area 4 are connected with supporting rope 3, there is not any direct connection relational with supporting rope 3 in all the other mesh 6.Particularly, in the embodiment shown in Fig. 1 and Fig. 2, the mesh 6 at the row edge, the end, three tops that each buffer area 4 that is mutually socketed the metal flexible net 1 forming by single ring-type mesh 6 has comprised contiguous support column 2, and all by Joining clasp 5 bufferings, be connected on its contiguous supporting rope 3; Mesh 6 is approximately row edge, the end, five tops mesh 6 that each buffer area 4 of the metal flexible net 1 of rhombus has comprised contiguous support column 2, from a beginning that is close to support column 2, at interval of one, by Joining clasp 5 bufferings, is connected on its contiguous supporting rope 3.
According to aforementioned, the utility model can be expressed as follows the range of definition of buffer area 4: at the bottom of the top of the metal flexible net 1 in the scope that the supporting rope 3 of 2 horizontal spreadings of adjacent two support columns forms in row edge mesh 6, and the region that is connected by snap ring 5 bufferings with 3 employings of supporting rope and forms with all or part of Joining clasp being connected 5 with these mesh 6 without row edge mesh 6 at the bottom of any direct-connected all tops.In this definition, at the bottom of the top of described metal flexible net 1, the mesh 6 at row edge is defined as row's mesh rather than the simple geometric definition that actual participation connects, if longitudinal development size of the metal flexible net 1 adopting is obviously greater than on region, the distance that lower support rope is 3, at the bottom of top on geometric meaning row's mesh 6 even other contiguous row's mesh 6 of inner side may be have more than needed and do not participate in any connection with practical significance, the mesh 6 of now participating in relevant connection directly is defined as the mesh 6 at row edge at the bottom of top described in the utility model according to its position.
Function needs according to the utility model to buffer area 4, described Joining clasp 5 is under load action or when load meets or exceeds predetermined value, can make it encircle all sizes obviously to increase or remove annular enclosed there is the modes such as obvious elongation strain, free segment 17 displacement releases, hasp 21 dropouts, separation, fracture, thereby weaken or remove the connection constraints to row edge mesh 6 at the bottom of the top of coupled metal flexible net 1, making each mesh Unit 6 in buffer area 4 reduce its interior load intensity to discharge the mode of larger displacement.
According to the functional requirement of above-mentioned Joining clasp 5, Joining clasp 5 can be helical spring, and helical spring can obviously extend.
Joining clasp 5 also can comprise by the bending ring bodies of metal wire rod 15.Concrete Joining clasp 5 can be scheme one as shown in Figure 3, be body of clasp 20, crosspoint 18 and the free segment 17 that Joining clasp 5 comprises fastener 19 and is bent to form by metal wire rod 15, in crosspoint, 18 places connect metal wire rod 15 two parts according to predetermined load fastener 19, and free segment 17 can be in the interior movement of fastener 19 when extraneous load surpasses predetermined load.So, when Joining clasp 5 loads meet or exceed predetermined value, body of clasp 20 first geometry variation is that its major axis dimension change weakens greatly its effect of contraction; While further increased by load, free segment 17 can skid off fastener 19 certain lengths and discharge displacement and obviously increase all sizes of Joining clasp 5 ring, and even free segment 17 can skid off fastener 19 completely and remove the annular enclosed state of snap ring 5 that connects.
Further, for making described Joining clasp 5 remain that in normal operation annular enclosed 4 regions, buffer area of avoiding form the excessive breach without any body of blocking, the end of described free segment 17 is connected with and prevents its skid-proof device skidding off from fastener 19 16.
Joining clasp 5 be also can be as shown in Figure 4 scheme two, metal wire rod 15 bending two ends form the mutual hooks of 21, two hasps of hasps 21 company.So, when Joining clasp 5 loads meet or exceed predetermined value, except its ring Zhou Shouxian is that its major axis dimension becomes large and weakens its effect of contraction with geometry deformation, its hasp 21 is removed its ring week with dropout mode or all upper certain points of its ring with fracture mode and is sealed.
Above-mentioned metal wire rod 15 can be steel wire, wire rope, steel strand or wherein appoint several combinations.In actual applications, when the protective capacities of flexible blocking backstop is had relatively high expectations, preferred such scheme one, particularly: described tinsel 15 adopts wire rope also to coil a circle, fastener 19 adopts rope clamp, and the end of free segment 17 is fixed with the skid-proof device 16 of wire rope aluminium alloys compacting joint; When the protective capacities of flexible blocking backstop requires when lower, preferred such scheme two, particularly: described metal wire rod 15 adopts intensity to be not less than the steel wire of 1770MPa and to coil a circle, two ends are bent into the hasp 21 of hook company mutually.
Based on the described technology contents of the utility model, improve different existing known blocking during net, its concrete use and mounting means can be different, the specific implementation form of especially described supporting mass 8 and specification and magnitude setting, Joining clasp 5 material therefor forms, the strength of materials, specification and encircle all concrete shapes, specification, the coiling number of turns, free segment 17 length and end skid-proof device 16 forms thereof, fixing or connected mode and the intensity thereof in crosspoint 18, the quantity that at the bottom of the top of interior the comprised metal flexible net 1 in buffer area 4, mesh 6 quantity at row edge and participation thereof connect, do not participate in the quantity connecting and be spaced mode etc.In addition, this difference also can be embodied in different support columns 2 places, two ends in flexible blocking backstop and arrange or do not arrange supporting mass 8 and buffer area 4.Further, this difference can be also with adopting individual layer, the double-deck even similar or dissimilar metals flexible net 1 of multilayer in flexible blocking backstop, how different the supporting rope that adopts 3 is even many of single, double joints of identical or different specification, and between these metal flexible nets 1 and supporting rope 3, have corresponding annexation.Above different and all should not be considered to the essential distinction with the utility model flexible blocking backstop based on the existing known difference of blocking net correlation technique and introducing.
Claims (9)
1. flexible blocking backstop, comprise supporting rope (3) and metal flexible net (1) that between at least two support columns (2) and support column (2), horizontal spreading is arranged, supporting rope (3) is connected with metal flexible net (1), it is characterized in that: at least one end of support column (2) length direction is connected with supporting mass free to rotate (8), supporting mass (8) tensioning supporting rope (3).
2. flexible blocking backstop according to claim 1, it is characterized in that: the Joining clasp (5) that comprises shape variable or easy fracture, metal flexible net (1) comprises mesh (6), it is buffer area (4) that at least one mesh (6) that is positioned at metal flexible net (1) top row or end row is connected to form the ，Gai region, region with pooling feature by Joining clasp (5) and supporting rope (3).
3. flexible blocking backstop according to claim 1 and 2, it is characterized in that: supporting mass (8) comprises fixed body (23) and rotor (22), on rotor (22), be provided with locating slot (24), fixed body (23) is connected with support column (2), and supporting rope (3) is positioned in locating slot (24).
4. flexible blocking backstop according to claim 2, is characterized in that: all or part of Joining clasp (5) that passes through of mesh (6) in buffer area (4) is connected with supporting rope (3); When mesh (6) part in buffer area (4) is connected with supporting rope (3), there is not any direct connection relational with supporting rope (3) in all the other mesh (6).
5. according to the flexible blocking backstop described in claim 2 or 4, it is characterized in that: Joining clasp (5) is helical spring.
6. according to the flexible blocking backstop described in claim 2 or 4, it is characterized in that: Joining clasp (5) comprises by the bending ring bodies of metal wire rod (15).
7. flexible blocking backstop according to claim 6, it is characterized in that: body of clasp (20), crosspoint (18) and free segment (17) that Joining clasp (5) comprises fastener (19) and is bent to form by metal wire rod (15), fastener (19) in crosspoint (18) locate according to predetermined load, metal wire rod (15) two parts to be connected, free segment (17) can move when extraneous load surpasses predetermined load in fastener (19).
8. flexible blocking backstop according to claim 7, is characterized in that: the end of free segment (17) is connected with skid-proof device (16).
9. flexible blocking backstop according to claim 6, is characterized in that: metal wire rod (15) bending two ends forms hasp (21), and two hasps (21) mutually hook connect.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320530024.9U CN203475447U (en) | 2013-08-28 | 2013-08-28 | Flexible blocking net |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320530024.9U CN203475447U (en) | 2013-08-28 | 2013-08-28 | Flexible blocking net |
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| Publication Number | Publication Date |
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| CN203475447U true CN203475447U (en) | 2014-03-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320530024.9U Withdrawn - After Issue CN203475447U (en) | 2013-08-28 | 2013-08-28 | Flexible blocking net |
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| CN (1) | CN203475447U (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103410162A (en) * | 2013-08-28 | 2013-11-27 | 布鲁克（成都）工程有限公司 | Flexible blocking net |
| CN104018440A (en) * | 2014-06-30 | 2014-09-03 | 布鲁克（成都）工程有限公司 | Flexible barrier net |
| CN104711934A (en) * | 2015-01-21 | 2015-06-17 | 同济大学 | Viaduct crosswind-prevention metal net |
| CN105019369A (en) * | 2015-07-31 | 2015-11-04 | 西南交通大学 | Flexible protective net with main and assistant cable system |
| CN105178334A (en) * | 2015-07-20 | 2015-12-23 | 安徽省无为煤矿机械制造有限公司 | Spring end sleeve for mine protective screen throwing |
| CN106223306A (en) * | 2016-07-25 | 2016-12-14 | 重庆华宇园林有限公司 | The deteriorated mountains region vegetation and landscape ecological repair system |
| CN107090804A (en) * | 2017-05-26 | 2017-08-25 | 中国科学院、水利部成都山地灾害与环境研究所 | A kind of flexible net debris flow dam and its construction method |
| CN112726439A (en) * | 2020-12-23 | 2021-04-30 | 重庆奇欣达科技有限公司 | Net piece with high strength damage prevention function |
| CN113005930A (en) * | 2021-01-25 | 2021-06-22 | 浙江安盛爆破工程有限公司 | Mine side slope protector |
| JP7377582B1 (en) | 2023-05-26 | 2023-11-10 | 株式会社プロテックエンジニアリング | shock absorbing fence |
-
2013
- 2013-08-28 CN CN201320530024.9U patent/CN203475447U/en not_active Withdrawn - After Issue
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103410162B (en) * | 2013-08-28 | 2015-08-12 | 布鲁克（成都）工程有限公司 | Flexible blocking backstop |
| CN103410162A (en) * | 2013-08-28 | 2013-11-27 | 布鲁克（成都）工程有限公司 | Flexible blocking net |
| CN104018440A (en) * | 2014-06-30 | 2014-09-03 | 布鲁克（成都）工程有限公司 | Flexible barrier net |
| CN104711934B (en) * | 2015-01-21 | 2017-05-24 | 同济大学 | Viaduct crosswind-prevention metal net |
| CN104711934A (en) * | 2015-01-21 | 2015-06-17 | 同济大学 | Viaduct crosswind-prevention metal net |
| CN105178334A (en) * | 2015-07-20 | 2015-12-23 | 安徽省无为煤矿机械制造有限公司 | Spring end sleeve for mine protective screen throwing |
| CN105019369A (en) * | 2015-07-31 | 2015-11-04 | 西南交通大学 | Flexible protective net with main and assistant cable system |
| CN106223306A (en) * | 2016-07-25 | 2016-12-14 | 重庆华宇园林有限公司 | The deteriorated mountains region vegetation and landscape ecological repair system |
| CN107090804A (en) * | 2017-05-26 | 2017-08-25 | 中国科学院、水利部成都山地灾害与环境研究所 | A kind of flexible net debris flow dam and its construction method |
| CN107090804B (en) * | 2017-05-26 | 2018-11-20 | 中国科学院、水利部成都山地灾害与环境研究所 | A kind of flexible net debris flow dam and its construction method |
| CN112726439A (en) * | 2020-12-23 | 2021-04-30 | 重庆奇欣达科技有限公司 | Net piece with high strength damage prevention function |
| CN113005930A (en) * | 2021-01-25 | 2021-06-22 | 浙江安盛爆破工程有限公司 | Mine side slope protector |
| CN113005930B (en) * | 2021-01-25 | 2022-03-08 | 浙江安盛爆破工程有限公司 | Mine side slope protector |
| JP7377582B1 (en) | 2023-05-26 | 2023-11-10 | 株式会社プロテックエンジニアリング | shock absorbing fence |
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