CN217460346U - Passive protective net - Google Patents

Abstract

The utility model provides a passive protection network for intercept domatic thing that weighs down, a specific embodiment of this protection network includes, its net piece setting is between the stand, and the bottom and the under bracing piece of net piece are connected, and the stand is in domatic first fixed point forms the bottom baseline, and the bottom of net piece is passed through this under bracing piece and is set up on domatic being located this bottom baseline top. The mesh bottom end and the ground are prevented from forming an obvious gap when the passive protective mesh is impacted, on one hand, potential safety hazards are favorably solved, and on the other hand, the protection energy level of the passive mesh is also improved.

Description

Passive protective net

Technical Field

The utility model relates to a flexible protection system of side slope in side slope protection engineering field relates to a passive protection network very much.

Background

Through the development of many years, the slope flexible protection system mainly comprises an active net, a passive net, a guide net, a shed tunnel protection device and the like at present, wherein the passive protection net is a protection net with more application scenes. Generally, a passive protection net system generally includes a support structure (steel column), an intercepting structure (a steel wire rope net or an annular net, a layer of grid net may be additionally provided when small rockfall needs to be intercepted), a connecting structure (including a pull anchor rope, a side pull rope, an upper support rope and a lower support rope, etc.), an energy consumption device (a pressure reducing ring, etc.), and the like. Specifically, an upper supporting rope passes through the top of a steel column, a lower supporting rope passes through a steel column base and is combined with a metal net to form a whole framework of the protective net, energy dissipation devices are strung into the supporting rope and the anchor pulling rope to serve as main energy dissipation components of the system, and the metal net serves as a system intercepting net. When falling rocks fall, the falling rocks impact the net piece, and the net piece drives the energy dissipaters on the supporting ropes and the anchor pulling ropes to deform and dissipate energy and finally intercept the falling rocks.

In 2007, 5, bruker (cheng du) engineering limited company proposed a highway protection device in CN201027300Y, a metal net is transversely arranged between upright posts 10, and a preliminary design of passive net flexible protection is proposed.

In 11 months 2010, CN 201896294U of Ott mechanical equipment Limited in Sichuan, a separated passive protective net is provided, and the traditional method of winding a steel column is abandoned by the connection mode of an upper pull anchor rope and a lower pull anchor rope of the separated protective system and the steel column. Subsequently, it proposes an improved separated passive protection net in CN202610815U, in which the portion of the upper end of the steel column contacting the upper supporting rope is set to be in a circular arc structure, so as to protect the upper supporting rope well.

In 9 months 2014, auster slope protection engineering limited in Sichuan proposed an easily repairable flexible passive protective net in CN204163087U, and an easily repairable connecting point is arranged on a anchor pulling rope between a connecting part of an anchor rod and a column head, so that replacement of an efficiency device or a damaged metal net unit can be realized.

In 2016, 2 months, bruker engineering limited proposed in CN105568876B a flexible barrier net with additional attachment structure to allow slidable attachment of the edge mesh of the metal net to the top support line.

In the year 2016, 10, the chengdu cheng architectural engineering limited company proposed in CN206091352U a passive net named "easy-to-repair steel strand protective net", in which a connecting plate 63 on a supporting plate 61 is connected with a lower supporting rope 4 (see paragraph 0033 of the specification).

Currently, in the prior art, the metal net is generally fixed directly at the bottom end of the steel column, or connected with the column base, the base, etc. of the steel column through a lower supporting rope, as shown in fig. 1. However, in the actual protection process, under the impact or the dragging of the falling rocks, the metal mesh or the energy dissipater on the lower supporting rope is deformed (as shown in fig. 2). In the impact zone, the problem of a significant gap 100 between the bottom end of the expanded metal sheet and the ground tends to occur, especially when the driven net has a steep installation slope and a non-flat ground surface, as shown in fig. 3. If the fallen stones are not cleaned timely, the follow-up small stones may pass through the gap, and the rear protection area is adversely affected, so that potential safety hazards are caused.

SUMMERY OF THE UTILITY MODEL

In order to solve the problem, the utility model provides a passive protection network to solve the technical problem that the current protection network system forms obvious clearance easily between metal mesh bottom and the ground when falling object and assaults and causes the potential safety hazard.

The utility model provides a passive net for intercept domatic thing that weighs down, including stand, net piece, under bracing piece, the quantity of stand is at least two, every the bottom mounting of stand is in domatic first fixed point, the net piece sets up between the stand, the bottom of net piece with the under bracing piece is connected, and line between the first fixed point of a plurality of forms the bottom base line, a serial communication port, the bottom of net piece is passed through under bracing piece sets up and is lieing in bottom base line top domatic going up.

Optionally, a second fixed point is arranged on the slope surface, the second fixed point is arranged above the first fixed point, and the lower support is sequentially connected with the second fixed point.

Optionally, the second fixing point is located in alignment with the first fixing point of the pillar along the longitudinal section of the slope.

Optionally, the number of the second fixing points is the same as the number of the first fixing points of the upright.

Optionally, the mesh between the lower support and the bottom base line is attached to the ramp.

Optionally, a limiting member is disposed on the lower support member, and the limiting member includes a first brake; in the longitudinal section direction of the slope, the deformation distance of the limiting part is not more than the shortest slope distance between the lower supporting part and the first fixed point of the upright post.

Optionally, the limiting member is disposed at a position between two adjacent second fixed points.

Optionally, the limiting member is disposed at an intermediate position between each two adjacent second fixed points.

Optionally, two ends of the lower supporting piece are respectively connected to a fourth figure fixed point outside the two outermost second fixed points.

Optionally, a corresponding second brake is arranged on the lower support between the two outermost second fixing points and the corresponding fourth fixing point of the lower support.

Optionally, the support piece still includes, go up the support piece and pass in proper order the upper end of stand, and with the upper end of stand is connected, the both ends of going up the support piece are connected respectively on two of the outermost side the fourth fixed point in the stand outside.

Optionally, a corresponding second brake is provided on the upper support between the upper end of the upright and the fourth fixing point corresponding to the upper support.

Optionally, each of the upper ends of the columns is provided with two upward cables, the two upward cables have the same length, one end of each upward cable is connected to the upper end of the column, the other end of each upward cable is connected to a fourth fixing point corresponding to the upward cable, and each of the two adjacent columns has one upward cable connected to the same fourth fixing point corresponding to the upward cable.

Optionally, a corresponding second brake is provided on the pull-up cable between the upper end of the upright and the fourth fixing point corresponding to the pull-up cable.

Optionally, below the slope surface, two of the pillars at the outermost side are respectively provided with a side stay cable, one end of the side stay cable is connected to the upper end of the pillar at the outermost side, and the other end of the side stay cable is connected to a fourth fixing point corresponding to the side stay cable.

Optionally, a corresponding second brake is provided on the side cable between the upper end of the upright and the fourth fixing point corresponding to the side cable.

The utility model discloses a passive protection network, through setting up the net piece between the stand, the bottom and the under bracing piece of net piece are connected, and the stand is in domatic fixed position forms the bottom baseline, and the bottom of net piece sets up on domatic being located this bottom baseline top through this under bracing piece, but also can set up the locating part on under bracing piece, has further reduced the possibility that the clearance appears, and the setting of upper bracing piece, pull-up cable isotructure has improved the system stability of passive protection network. The bottom end of the metal net is prevented from forming an obvious gap with the ground when the passive protective net is impacted, the potential safety hazard is favorably solved, and the protection energy level of the passive net is also improved.

Drawings

These and other objects, features and advantages of the present invention will become more apparent upon reading the following detailed description of the preferred embodiments and accompanying drawings. It is to be understood that although the embodiments are described separately, individual features thereof may be combined in other embodiments.

Fig. 1 is a schematic view showing a structure of a conventional passive protection net;

fig. 2 is a side view illustrating the passive protection net of fig. 1 when being impacted by a falling object;

fig. 3 is a schematic view showing a gap formed after the passive protection net in fig. 1 is impacted by a falling object;

fig. 4 is a perspective view showing a passive protection net in the first embodiment;

fig. 5 is a side view showing a passive protection net in the first embodiment;

fig. 6 is a schematic view showing the passive protection net after being impacted by a falling object in the first embodiment;

fig. 7 is a perspective view showing a passive protection net in a second embodiment;

fig. 8 is a side view showing a passive protection net in the second embodiment;

fig. 9 is a schematic view showing the passive protection net in the second embodiment after being impacted by a falling object;

fig. 10 is a perspective view showing a passive protection net in a third embodiment;

fig. 11 is a side view showing a passive protection net in a third embodiment;

fig. 12 is a schematic view showing the passive protection net in the third embodiment after being impacted by a falling object;

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort belong to the protection scope of the present application.

In addition, the drawings may show the components enlarged for easy understanding. The size ratio of the constituent elements may be different from the actual size ratio or from the size ratio in other drawings. In the cross-sectional view, hatching of some of the components may be omitted for easy understanding.

< first embodiment >

A first embodiment of the present invention will be described with reference to fig. 4 to 6.

As shown in fig. 4 and 5, the passive net 10 in this embodiment is used to intercept falling objects such as falling rocks, mountain bodies, large trees, etc. on the slope surface 30. Passive net 10 includes stand 1, net piece 2, under bracing piece 3, and stand 1 sets up along domatic 30 interval, transversely sets up net piece 2 between stand 1, and support piece 3 is connected down to the lower extreme of net piece 2, and the fixed point 4 on domatic 30 is fixed to the bottom of stand 1, and the line between the first fixed point 4 of a plurality of forms bottom baseline 5, and the bottom of net piece 2 sets up on domatic 30 that is located bottom baseline 5 top through under bracing piece 3. Upward here means upward along the slope.

In a possible implementation manner, the mesh sheet 2 and the lower support 3 may be connected by a connecting member, which may be a winding type connecting member such as a steel wire rope or a sewing rope, or a detachable type connecting member such as a shackle or a buckle, and the connecting form may be a fixed connection or a sliding connection.

In a possible implementation mode, the upright column 1 can adopt an H-shaped, I-shaped or cylindrical steel column, and the like, and the bottom end of the upright column 1 can be anchored on the slope surface through a first fixing point. The upright post 1 can be vertically arranged on a slope surface and can also form a certain angle with the slope surface, and the specific arrangement mode is determined according to the actual application scene.

According to a possible implementation mode, the net piece 2 is made of a metal net which is used as an intercepting and impact-resisting component for a slope falling object, the falling object can be intercepted, the metal net can be subjected to geometric deformation when being impacted, and the kinetic energy absorption capacity is high. Generally, the metal net can be a wire rope net or an annular net, and the diameter of the ring of the annular net is generally 80 mm-500 mm.

In addition, the metal net can be only one or more. The metal nets 2 can be spliced together through connecting pieces, and the connecting pieces can be winding connecting pieces such as steel wire ropes and sewing ropes, and can also be detachable connecting pieces such as shackles and buckles.

One possible way of achieving this is that the mesh 2 between the lower support 3 and the base string 5 is attached to the slope, the mesh 2 forming a tuck-net type structure in this particular protected area, as shown in fig. 4 and 5. When falling objects such as falling stones impact the passive net, the gap can be prevented through the structural characteristics of the trailing type passive net system, the possibility that small falling objects slide from the gap is eliminated, and the protection reliability of the passive net is improved.

In a possible embodiment, the lower support 3 may be a metal rod or a wire rope, and the wire rope may be preferably used from the viewpoint of convenience in construction. Generally, when the device is installed, a plurality of second fixing points 6 are arranged on the slope surface 30. The second fixing points 6 are arranged above the first fixing points 4, and the shortest slope distance between the lower support 3 and the first fixing points 4 in the longitudinal section direction of the slope is D1, and the lower support is not impacted by a falling object at the moment, as shown in fig. 5.

The first fixing point 4 and the second fixing point 6 can form anchoring points in an anchoring mode. The second fixing point 6 can adopt a prestressed anchor rod or a steel wire anchor rod and the like, and then the lower supporting piece 3 is installed. After being tensioned tightly, the lower support piece 3 can be directly and fixedly connected with the exposed ring sleeve of the second fixing point 6, and can also be fixedly connected with the exposed ring sleeve of the second fixing point 6 by adopting structures such as a shackle, a rope clamp and the like. The mesh 2 is then sewn or attached to the lower support 3 and pre-tensioned.

The number and position of the second fixing points 6 can be selected according to the actual engineering situation. Preferably, the second fixing points 6 are located in a one-to-one alignment with the first fixing points 4 of the upright 1 along the longitudinal section of the ramp 30, as shown in fig. 4 and 5. Preferably, the number of second fixing points 6 is the same as the number of first fixing points 4 of the upright 1.

The upright post 1 is fixed on the slope surface 30, and the bottom end of the net sheet 2 is arranged on the slope surface 30 above the bottom base line 5 through the lower supporting piece 3. Thereby, the whole length of the net sheet 2 will be lengthened, and the lower support 3 is relatively independently installed above the bottom of the vertical column 1 of the passive net. When a falling object on the slope surface 30 impacts the passive net 10, the net piece 2, the lower supporting piece 3 and other structures deform, the lower supporting piece 3 at the bottom end of the net piece 2 displaces towards the lower part of the slope surface 30, a gap 101 is formed, and the passive net 10 can provide a buffering deformation space.

As shown in fig. 6, after the impact, the lower end of the mesh sheet 2 and the lower support 3 also stay in the area above the bottom base line 5, and do not cross the bottom base line 5 to form a significant gap. Thereby well solving the technical problem of the present invention.

< second embodiment >

Next, a second embodiment of the present invention is described with reference to fig. 7 to 9.

This embodiment is achieved by modifying the structure of the lower support 3 in the first embodiment, and the other configurations are the same or similar. Accordingly, the same or similar structures as those of the first embodiment are denoted by the same reference numerals, and the same or similar structures, functions, and effects as those of the first embodiment are not described to avoid repetitive description.

In the passive net 10 of the present embodiment, the stopper 7 is disposed on the lower support 3, and the stopper 7 includes the first stopper 71 and the stopper cable 72. The first brake 71 is configured to allow the stopper 7 to be extended when the pulling force of the first brake 71 exceeds a certain threshold value, and to pull the stopper 7 to the maximum deformation state when the pulling force of the first brake 71 exceeds another maximum threshold value. The distance D2 of the deformation of the stop 7 in the direction of the longitudinal section of the ramp 30 is shown in fig. 9.

Preferably, the deformation distance of the limiting member 7 in the longitudinal tangential direction of the slope 30 is D2, which is not greater than the shortest slope distance D1 between the second fixing point 6 and the first fixing point 4 in the longitudinal tangential direction of the slope 30, as shown in fig. 9.

In general, the first brake 71 may be a conventional pressure relief ring, or other energy dissipating structure.

In a possible implementation manner, the limiting member 7 further includes a limiting cable 72, and both ends of the first stopper 71 are connected to the limiting cable 72. During installation, grouting is firstly performed on the slope surface 30, a plurality of third fixing points 8 are inserted, the upper end of the limiting part 7 is fixed on the third fixing points 8 through the limiting cable 72, and the lower end of the limiting part 7 is connected with the lower supporting part 3 through the connecting part 9 through the limiting cable 72. The connecting piece 9 can be a winding type connecting piece formed by winding a lower supporting piece by a limiting cable 72 or other steel wire ropes, suture ropes and the like, and can also be a detachable type connecting piece such as a shackle, a buckle and the like.

The limiting member 7 is provided at a position between two adjacent second fixing points 6. The number and the specific installation position of the limiting members 7 can be selected according to the actual engineering situation.

Preferably, a stop element 7 is arranged between each two adjacent second fixing points 6, and the position of the connecting element 9 is located at an intermediate position between the two adjacent second fixing points 6, as shown in fig. 7.

Of course, two or more limiting members 7 may be provided between each two adjacent second fixing points 6. It is also possible to provide several limiting elements 7 between some two adjacent second fixing points 6, and to provide no limiting elements 7 between some two adjacent second fixing points 6. The above all belong to the protection scope of the present application.

When a falling object on the slope surface 30 impacts the driven net 10, the structures of the net piece 2, the lower support piece 3 and the like deform, the lower support piece 3 at the bottom end of the net piece 2 displaces towards the lower part of the slope surface 30, and a gap 102 is formed. With the increase of the number and the weight of the falling objects, the intercepted sloping falling objects reach the interception threshold value of the passive net 10, wherein the interception threshold value refers to the maximum weight of the falling objects which can be intercepted by the passive net installed on the sloping surface. Correspondingly, the deformation displacement formed by the bottom end of the mesh 2 or the lower support 3 on the slope 30 also reaches a deformation displacement threshold value, and the deformation displacement threshold value refers to the maximum deformation displacement magnitude of the deformation of the bottom end of the mesh 2 or the lower support 3 on the slope downward when the interception amount of the passive mesh 10 reaches the interception threshold value. When the interception amount of the falling object does not reach the interception threshold of the passive net 10, the displacement of the bottom end of the net piece 2 or the lower support 3 towards the lower part of the slope does not exceed the deformation displacement threshold, so that the shortest slope distance D1 is not exceeded.

In the present embodiment of the limiting element 7, the limiting element 7 is allowed to be elongated only when the pulling force on the limiting cable 72 exceeds a certain critical value, and the limiting element 7 is pulled to the maximum deformation state when the pulling force on the limiting cable 72 exceeds another maximum critical value. And the limiting member 7 is connected with the lower support member 3 of the passive net 10 so that the deformation range of the lower support member can be limited. Because the deformation distance D2 of locating part 7 is not more than the second fixed point 6 and when first fixed point 4 is at the shortest domatic distance D1 of domatic 30 longitudinal section direction, passive net 10 can guarantee at whole interception in-process, in the impact region of domatic weight thing, can not form obvious clearance between the under bracing piece that the net piece 2 bottom links to each other and domatic, can improve the protection reliability of passive net, reduce dangerous accident, improve the security of protection.

In addition, in some application scenarios where high-strength protection is not required, such as in a protection area where the slope is not steep, where the falling rock amount is small, or where it is convenient to clean a falling object, the deformation distance D2 of the stopper 7 is not necessarily set to be no greater than the shortest slope distance D1. Therefore, in some special engineering scenes, even if the deformation distance D2 of the limiting member 7 is greater than the shortest slope distance D1, as long as a falling object on the slope 30 impacts the passive net 10, as long as the bottom end of the net sheet 2 or the lower supporting member 3 is positioned on the slope above the base baseline 5, it can be ensured that even if the passive net 10 is deformed by a certain amount, no significant gap will occur in a specific protection area, and the corresponding protection requirement can be met.

< third embodiment >

Next, a third embodiment of the present invention is described with reference to fig. 10 to 12.

This embodiment is achieved by modifying the other structure in the second embodiment. Accordingly, the same or similar structures as those of the first embodiment, the second embodiment are denoted by the same reference numerals, and the same or similar structures, functions and effects as those of the first embodiment, the second embodiment are not described to avoid the repetitive description.

Fig. 10 to 12 only show the improvement of the passive mesh structure in the second embodiment, and similar improvements can be made to the passive mesh in the first embodiment, which is not described again.

As shown in fig. 11 and 12, the passive net 10 further includes an upper support 11, an upper pull cable 12, and a side pull cable 13.

The upper support 11 may be a metal rod or a wire rope, and the wire rope may be preferably used from the viewpoint of convenience in construction. Between the upper support piece 11 and the upper end of the upright post 1 and between the upper support piece 11 and the net piece 2, the connection pieces can be spliced by connecting pieces, and the connecting pieces can be wound connecting pieces such as steel wire ropes and sewing ropes, and can also be detachable connecting pieces such as shackles and buckles.

The upper supporting member 11 sequentially passes through the upper ends of the plurality of columns 1 and is connected with the upper ends of the columns 1. The two ends of the upper support 11 can be fixed on the outer sides of the two outermost columns 1 of the passive net 10 through the fourth fixing points 14. The two ends of the lower support 3 can also be fixed outside the outermost two second fixing points 6 by means of further fourth fixing points 14.

Preferably, the upper support 11 is provided with a second stop 20 between the upper end of the upright 1 and the corresponding fourth fixing point 14.

The second brake 20 is configured to allow the second brake 20 to be extended when the tractive effort of the second brake 20 exceeds a certain threshold value, and the second brake 20 is pulled to a maximum deformation state when the tractive effort of the second brake 20 exceeds another maximum threshold value.

Preferably, the lower support 3 is provided with a second brake 20 between the two outermost second fixing points 6 and the corresponding fourth fixing points 14.

As shown in fig. 11, two pull-up cables 12 are respectively arranged at the upper end of each upright post 1 above the slope 30, and the lengths of the two pull-up cables 12 are the same. One end of the upper pull cable 12 is fixed on the upper end of the upright post 1, and the other end of the upper pull cable 12 is fixed on a fourth fixing point 14 corresponding to the upper pull cable. Two adjacent upright posts 1 are respectively provided with an upper pull cable 12 fixed on the same fourth fixing point 14.

Preferably, the pull-up cable 12 is provided with a second brake 20 between the upper end of the upright 1 and the corresponding fourth fixing point 14.

As shown in fig. 11, below the slope 30, a side stay 13 is provided on each of the outermost two columns 1, one end of the side stay 13 is fixed to the upper end of the outermost column 1, and the other end of the side stay 13 is fixed to a fourth fixing point 14 corresponding thereto.

Thereby improving the protective energy level and stability of the passive net 10.

The foregoing description is only exemplary of the preferred embodiments of the disclosure and is illustrative of the principles of the technology employed. It will be appreciated by those skilled in the art that the scope of the disclosure herein is not limited to the particular combination of features described above, but also encompasses other embodiments in which any combination of the features described above or their equivalents does not depart from the spirit of the disclosure. For example, the above features and (but not limited to) the features disclosed in this disclosure having similar functions are replaced with each other to form the technical solution.

Claims (18)

1. The utility model provides a passive protection network for intercept domatic weight thing, includes stand, net piece, under bracing piece, the quantity of stand is at least two, every the bottom mounting of stand is in domatic first fixed point, the net piece sets up between the stand, the bottom of net piece with under bracing piece is connected, a plurality of line between the first fixed point forms the bottom baseline, its characterized in that, the bottom of net piece is passed through under bracing piece sets up and is being located bottom baseline top on domatic.

2. A passive protective net according to claim 1, characterised in that: set up the second fixed point on domatic, the second fixed point sets up the top of first fixed point, the under bracing piece in proper order with the second fixed point is connected.

3. A passive protective net according to claim 2, characterised in that: the position of the second fixed point is aligned with the first fixed point of the upright post along the longitudinal section direction of the slope surface.

4. A passive protective net according to claim 3, characterised in that: the number of the second fixing points is the same as the number of the first fixing points of the upright post.

5. A passive protection net according to any one of claims 1-4, characterised in that: the mesh sheet positioned between the lower support piece and the bottom base line is attached to the slope surface.

6. A passive protection net according to claim 1, characterised in that: arranging a limiting piece on the lower support piece, wherein the limiting piece comprises a first brake; in the longitudinal section direction of the slope, the deformation distance of the limiting part is not more than the shortest slope distance between the lower supporting part and the first fixed point of the upright post.

7. A passive protective net according to claim 6, characterised in that: the limiting piece further comprises a limiting cable, and two ends of the first brake are connected with the limiting cable respectively; the upper end of the limiting part is connected to a third fixed point through the limiting cable, and the lower end of the limiting part is connected with the lower supporting part through the limiting cable.

8. A passive protective net according to any one of claims 2-4, characterised in that: arranging a limiting piece on the lower support piece, wherein the limiting piece comprises a first brake; in the longitudinal section direction of the slope, the deformation distance of the limiting part is not more than the shortest slope distance between the lower supporting part and the first fixed point of the upright post.

9. A passive protective net according to claim 8, characterised in that: the limiting piece further comprises a limiting cable, and two ends of the first brake are connected with the limiting cable respectively; the upper end of the limiting part is connected to a third fixed point through the limiting cable, and the lower end of the limiting part is connected with the lower supporting part through the limiting cable.

10. A passive protective net according to claim 9, characterised in that: the limiting piece is arranged at a position between two adjacent second fixed points.

11. A passive protective net according to claim 10, characterised in that: the limiting piece is arranged at the middle position between every two adjacent second fixed points.

12. A passive protective net according to claim 8, characterised in that: and two ends of the lower supporting piece are respectively connected to fourth fixing points outside the two second fixing points on the outermost side.

13. A passive protective net according to claim 12, characterised in that: and corresponding second brakes are arranged on the lower support between the two outermost second fixed points and the fourth fixed points corresponding to the lower support.

14. A passive protective net according to claim 12, characterised in that: still include support piece, support piece passes in proper order the upper end of stand, and with the upper end of stand is connected, support piece's both ends are connected respectively at two of the outside on the fourth fixed point in the stand outside.

15. A passive protective net according to claim 14, characterised in that: and a corresponding second brake is arranged on the upper supporting piece between the upper end of the upright post and the fourth fixed point corresponding to the upper supporting piece.

16. A passive protection net according to any one of claims 14 or 15, characterised in that: every the upper end of stand is provided with two pull-up cables respectively, and these two the length of pull-up cable is the same, pull-up cable orientation domatic top, the one end of pull-up cable is connected on the upper end of stand, the other end of pull-up cable is connected with this pull-up cable corresponding on the fourth fixed point, adjacent two the stand all respectively have one the pull-up cable connect with on the same of pull-up cable corresponds on the fourth fixed point.

17. A passive protection net according to claim 16, characterised in that: and a corresponding second brake is arranged on the pull-up cable between the upper end of the upright post and the fourth fixing point corresponding to the pull-up cable.

18. A passive protective net according to claim 16, characterised in that: the two upright columns on the outermost side are respectively provided with a side stay cable, the side stay cables face the lower part of the slope, one end of each side stay cable is connected to the upper end of the upright column on the outermost side, and the other end of each side stay cable is connected to a fourth fixing point corresponding to the side stay cable.

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