Dangerous rock mass protection and retaining structure

Abstract

The embodiment of the present application provides a dangerous rock protection support structure, which relates to the field of rock protection. The dangerous rock protection support structure includes: a first anti-falling net is arranged below the dangerous rock, a first tightening rope is arranged at one end of the first anti-falling net, and a pull rod is arranged above the parent rock, a rotatable first winding wheel is arranged on one side of the outer surface of the pull rod, and the first tightening rope is wound around the outer surface of the first winding wheel, the surface of the dangerous rock is covered with a protective net, the upper and lower ends of the protective net are respectively provided with pull ropes, and the top wall and side walls of the parent rock are respectively fixed with a first base and a second base, after the falling rock falls above the first anti-falling net, the impact force of its fall can pull the first winding wheel to rotate, and as the first winding wheel rotates, its first gear rotates to tighten the protective net to protect the dangerous rock.

Description

Technical Field

[0001] The present application relates to the field of rock protection technology, and in particular to a retaining structure for protecting dangerous rock masses. Background Art

[0002] In related technologies, the dangerous rock protection structure uses the prestressed force provided by the anchors to pre-fix the dangerous rock mass and the main rock mass, so that the structural surface is in a compressed state to improve the integrity of the dangerous rock mass and the main rock mass, thereby fundamentally improving the mechanical properties of the rock mass and effectively controlling the displacement of the rock mass. The wire rope net is then wrapped around the dangerous rock mass to limit the weathering, peeling or destruction of the dangerous rock mass and the collapse of the rock strata, thereby playing a reinforcing role, controlling the movement of falling rocks within a certain range, and playing a protective role.

[0003] In the prior art (application number CN202111068753.2, patent name is patent application for composite protective structure for dangerous rock masses), the steel wire rope on the winch is tightened. After the first steel rope is tensioned, the second rope buckle at the second ring is gradually untied until the second rope buckle releases the pressure on the first steel rope. Then, the steel wire rope on the winch is tightened, driving the first steel rope to tighten. At the same time, the tensioning force of the first steel rope gradually increases. After the first steel rope drives the protective net to be tensioned, the second rope buckle is tightened until the second rope buckle presses the first steel rope to form a second ring again, thereby achieving the purpose of tensioning the tensioning steel rope after the tensioning force has decreased. During the process, the first steel rope is in a tensioned state, reducing the need to release all the tensioning force of the tensioning steel rope first. This effectively improves the dangerous rock mass protective structure in the related art, which is inconvenient to increase the tensioning force of the tensioning steel rope without releasing the tensioning force of the tensioning steel rope. In the process of implementing this technical solution, it was found that at least the following problems exist in the prior art.

[0004] In the above-mentioned prior art, dangerous rock masses are protected by their protective nets, and falling rocks are further protected by the barrier assembly. However, during the use of the protective net, it is often necessary to achieve the purpose of tensioning the wire rope net by the tensioning force provided by the tensioning steel cable. During long-term use, the tensioning force of the tensioning steel cable is easily reduced due to deformation, loosening of the steel cable or changes in the rock mass, which can easily cause falling rocks to roll down the protected dangerous rock masses. After the falling rocks fall to the surface of the barrier assembly, the tightness of the protective net cannot be reinforced by the barrier assembly. Summary of the Invention

[0005] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes a structure for protecting and retaining dangerous rock masses. When a rock falls above a first anti-fall net, the impact force of the rock falls can pull a first winding wheel to rotate. As the first winding wheel rotates, its first gear rotates, tightening the protective net to protect the dangerous rock mass.

[0006] According to an embodiment of the present application, the dangerous rock mass protection and retaining structure includes a parent rock and a dangerous rock mass with side walls of the parent rock protruding outward and in a suspended state, including:

[0007] A first anti-fall net is arranged below the dangerous rock mass, a first tightening rope is arranged at one end of the first anti-fall net, and a pull rod is arranged above the parent rock, a rotatable first winding wheel is arranged on one side of the outer surface of the pull rod, and the first tightening rope is wound around the outer surface of the first winding wheel.

[0008] Furthermore, the surface of the dangerous rock mass is covered with a protective net, the upper and lower ends of the protective net are respectively provided with pull ropes, and the top wall and side walls of the parent rock are respectively fixed with a first base and a second base.

[0009] Furthermore, both ends of the pull rod are respectively threadedly connected with threaded rods, and the ends of the threaded rods are fixedly provided with connectors. The connectors provided at both ends of the pull rod can be connected to the pull rope and the second base.

[0010] Furthermore, a drive box is fixedly provided at one end of the pull rod, and the interior of the drive box is a hollow structure. The first winding wheel is arranged on one side of the outer surface of the drive box. The drive box and one end of the pull rod are respectively provided with positioning blocks. The middle part of the positioning block is a hollow structure. At the same time, the positioning block located at one end of the pull rod is provided with a rotatable nut.

[0011] Furthermore, a crown gear is fixedly provided on the first winding wheel on one side of the outer surface of the drive box, and the crown gear extends to the inner side wall of the drive box. A positioning rod is fixedly provided on the inner wall of the drive box, and a first gear is hingedly provided on the front of the positioning rod, and a threaded hole is opened through the front of the first gear.

[0012] Furthermore, the threaded hole is threadedly connected to the threaded rod, and a second gear is meshedly connected between the first gear and the crown gear, and the diameter of the second gear is smaller than that of the first gear.

[0013] Furthermore, support rods are respectively provided on both sides of the front of the first base, forming a right angle between the support rods and the first base, and a U-shaped frame is fixedly connected to the other end of the support rod, and a first rotating wheel and a second rotating wheel are provided between the inner side walls of the U-shaped frame.

[0014] Furthermore, a moving groove is provided through the front of the U-shaped frame, and a deceleration plate is provided between the inner walls of the U-shaped frame, and the deceleration plate is located on one side of the outer surface of the second rotating wheel.

[0015] Furthermore, racks are provided on both sides of the outer surface of the deceleration plate, and the racks pass through the movable groove, and half gears are provided on both ends of the outer surface of the second rotating wheel, and the half gears can be engaged with the racks, and a spring is provided on one end of the rack.

[0016] Furthermore, a second anti-falling net is provided above the first anti-falling net.

[0017] The beneficial effects of the present application are as follows: after the dangerous rock mass under the inner wall of the protective net becomes loose and falls onto the surface of the first anti-fall net, the fallen rocks fall and impact the first anti-fall net, and then the first anti-fall net can pull the first winding wheel through the first tightening rope, and the first winding wheel can drive the first gear through the crown gear and the second gear under the impact of the falling rocks, and then the first gear rotates, and after being threadedly connected to the threaded rod through the threaded hole, the protective net can be further tightened, so that the tension of the protective net can be further strengthened. At the same time, after the first anti-fall net is impacted by the falling rocks and starts to fall, the first tightening rope at one end of the first anti-fall net can drive the second rotating wheel when moving, and after the second rotating wheel rotates, it can engage the rack through the half gear, and as the rack moves, the net can be pulled The second take-up rope is then wound up by the second take-up wheel, thereby moving one end of the second anti-fall net to the other side, shrinking the opening above it to prevent the falling rocks from rolling down.

[0018] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 1 is a schematic diagram of the overall three-dimensional structure of the dangerous rock mass protection and retaining structure according to an embodiment of the present application;

[0021] Figure 2 2 is a schematic structural diagram of a second anti-fall net according to an embodiment of the present application;

[0022] Figure 3 is a schematic diagram of a pull rod structure according to an embodiment of the present application;

[0023] Figure 4 is a schematic diagram of a top plan structure of a pull rod according to an embodiment of the present application;

[0024] Figure 5 1 is a schematic diagram of the cross-sectional structure along line AA according to an embodiment of the present application;

[0025] Figure 6 According to the embodiment of this application Figure 5 A in the middle is an enlarged structural diagram;

[0026] Figure 7 1 is a schematic diagram of the support rod structure according to an embodiment of the present application;

[0027] Figure 8 is a schematic side plan view of the support rod structure according to an embodiment of the present application;

[0028] Figure 9 According to the embodiment of this application Figure 8 The enlarged structural diagram at B in the middle;

[0029] Figure 10 It is a schematic diagram of the structure of the second winding wheel according to an embodiment of the present application.

[0030] Icons: 1- parent rock; 11- dangerous rock mass; 12- first base; 13- second base; 2- protective net; 21- pull rope; 3- pull rod; 31- drive box; 311- positioning rod; 312- first gear; 313- threaded hole; 314- second gear; 32- positioning block; 33- nut; 34- threaded rod; 35- connector; 36- first reel; 37- crown gear; 4- support rod; 41- U-shaped frame; 42-first rotating wheel; 43-second rotating wheel; 44-speed brake; 45-rack; 46-half gear; 47-spring; 48-moving groove; 5-first anti-fall net; 51-first tightening rope; 6-second anti-fall net; 61-second tightening rope; 7-winding chamber; 71-spring chamber; 72-card slot; 8-second winding wheel; 81-rotating disk; 82-retraction chamber; 83-card block; 84-arc spring; 85-spring. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application.

[0032] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0033] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for protection, but merely represents selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0034] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0035] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on this application.

[0036] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. Throughout the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0037] In this application, unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be interpreted broadly. For example, they may refer to fixed connection, detachable connection, or integration; they may refer to direct connection or indirect connection through an intermediate medium; they may refer to internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0038] In this application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0039] The following describes a dangerous rock mass protection and retaining structure according to an embodiment of the present application with reference to the accompanying drawings.

[0040] like Figure 1-Figure 2 It is shown that the dangerous rock body protection and retaining structure according to the embodiment of the present application includes: a parent rock 1 and a dangerous rock body 11 with the side walls of the parent rock 1 protruding outward and in a suspended state, and a protective net 2 is connected to the surface of the dangerous rock body 11, and the protective net 2 fully covers the dangerous rock body 11 on the inner side, and the upper and lower ends of the protective net 2 are respectively provided with pull ropes 21, and the pull ropes 21 are evenly distributed laterally at the ends of the protective net 2, so that the tension can be evenly distributed.

[0041] The top wall and side wall of the parent rock 1 are respectively fixed with a first base 12 and a second base 13, and the other ends of the pull rope 21 for bidirectionally tightening the protective net 2 are respectively connected to the first base 12 and the second base 13, so that the bidirectional tension of the pull rope 21 makes the inner side of the protective net 2 fully cover the surface of the dangerous rock body 11, thereby providing protection thereto.

[0042] A pull rod 3 is provided at one end of the pull rope 21 connected to the second base 13, and a threaded rod 34 is threadedly connected to both ends of the pull rod 3. A connecting head 35 is fixedly provided at the end of the threaded rod 34. The connecting heads 35 provided at both ends of the pull rod 3 can be connected to the pull rope 21 and the second base 13. Since the pull rod 3 and the connecting head 35 are threadedly connected, it is convenient to adjust the tightness of the protective net 2.

[0043] like Figures 1 to 7 As shown, supporting rods 4 are respectively provided on both sides of the front of the first base 12, and a right angle is formed between the supporting rod 4 and the first base 12. At the same time, a U-shaped frame 41 is fixedly connected to the other end of the supporting rod 4, and a first rotating wheel 42 and a second rotating wheel 43 are hingedly provided between the inner side walls of the U-shaped frame 41, and the outer surfaces of the first rotating wheel 42 and the second rotating wheel 43 are close to and fit each other. A first anti-falling net 5 is fixedly connected to the bottom of the first base 12, and a first tightening rope 51 is respectively provided on both sides of the other end of the first anti-falling net 5, and one end of the first tightening rope 51 passes through the gap between the first rotating wheel 42 and the second rotating wheel 43.

[0044] A drive box 31 is fixedly mounted on one end of the pull rod 3. The interior of the drive box 31 is a hollow structure, and a rotatable first reel 36 is hingedly mounted on one side of the drive box 31. The end of the first tightening rope 51 is wrapped around the outer surface of the first reel 36. Positioning blocks 32 are respectively mounted on one end of the drive box 31 and one end of the pull rod 3. The middle portion of each positioning block 32 is a hollow structure. A rotatable nut 33 is mounted on the positioning block 32 at one end of the pull rod 3. The internal thread of the nut 33 is threadedly connected to the external thread of the threaded rod 34.

[0045] A crown gear 37 is fixedly provided on the first winding wheel 36 near the outer surface of the drive box 31, and the crown gear 37 extends to the inner side wall of the drive box 31. A positioning rod 311 is fixedly provided on the inner wall of the drive box 31, and a first gear 312 is hingedly provided on the front of the positioning rod 311. A threaded hole 313 is provided on the front of the first gear 312, and the threaded hole 313 can be threadedly connected to the threaded rod 34. At the same time, a second gear 314 is meshed and connected between the first gear 312 and the crown gear 37, and the diameter of the second gear 314 is smaller than that of the first gear 312. After the dangerous rock mass 11 is fully protected by the protective net 2, as time goes by, the dangerous rock mass 11 under the inner wall of the protective net 2 becomes loose and falls to the surface of the first anti-fall net 5. The fallen stones fall and hit the first anti-fall net 5. Then the first anti-fall net 5 can pull the first winding wheel 36 through the first tightening rope 51. Under the impact of the falling stones, the first winding wheel 36 can drive the first gear 312 through the crown gear 37 and the second gear 314. Then the first gear 312 rotates and is threadedly connected to the threaded rod 34 through the threaded hole 313, so that the protective net 2 can be further tightened, so that the tension of the protective net 2 can be further strengthened.

[0046] like Figure 1 and Figure 7As shown, a movable groove 48 is opened through the front of the U-shaped frame 41, and a deceleration plate 44 is arranged between the inner walls of the U-shaped frame 41, and the deceleration plate 44 is located on one side of the outer surface of the second rotating wheel 43, and racks 45 are respectively provided on both sides of the outer surface of the deceleration plate 44, and the racks 45 pass through the movable groove 48, and half gears 46 are provided on both sides of the outer surface of the second rotating wheel 43, and the half gears 46 can be meshed with the rack 45, and a spring 47 is provided on one end of the rack 45. After the first anti-fall net 5 is impacted by falling rocks and starts to fall, the first tightening rope 51 at one end of the first anti-fall net 5 can drive the second rotating wheel 43 when moving. After the second rotating wheel 43 rotates, the rack 45 can be engaged through the half gear 46. As the rack 45 moves, the deceleration plate 44 can be pulled so that the arc surface of the deceleration plate 44 can be fitted against the outer surface of the second rotating wheel 43, thereby achieving a certain deceleration effect on the first anti-fall net 5. An intermittent buffering effect can be achieved through the spring 47, the rack 45 and the half gear 46.

[0047] like Figures 7 to 10 As shown, when the first anti-fall net 5 is used to prevent falling rocks, since the first anti-fall net 5 is a single-layer arrangement, the falling rocks are prone to slipping after the prevention. A second anti-fall net 6 is arranged above the first anti-fall net 5. One end of the second anti-fall net 6 is fixedly connected to the surface of the first anti-fall net 5. A winding bin 7 is fixedly arranged on one side of the bottom surface of the support rod 4. A spring bin 71 is arranged on one side of the outer surface of the winding bin 7. The winding bin 7 and the inner cavity of the spring bin 71 are hollow. A second winding wheel 8 is arranged inside the winding bin 7. One end of the second winding wheel 8 extends into the inner cavity of the spring bin 71. A rotating disk 81 is fixedly arranged at the end of the second winding wheel 8 located in the inner cavity of the spring bin 71. A spring 85 is arranged between the front of the rotating disk 81 and the inner wall of the spring bin 71.

[0048] At the same time, a card slot 72 is opened on the inner wall of the clockwork bin 71, and a retraction bin 82 is opened inward on one side of the outer surface of the rotating disk 81, and a card block 83 is set inside the retraction bin 82. One end of the card block 83 is hinged to the inner wall of the retraction bin 82, and an arc spring 84 is set between the outer surface of the card block 83 and the inner wall of the retraction bin 82. Second tightening ropes 61 are respectively provided on both sides of the end of one side of the second anti-fall net 6, and a small part of one end of the second tightening rope 61 is wrapped around the outer surface of the second winding wheel 8. Therefore, after the falling rocks of the dangerous rock body 11 fall above the second anti-falling net 6, the falling impact force of the falling rocks drives the second winding wheel 8 to rotate clockwise through the second tightening rope 61, and then the rotating disk 81 can drive the clamping block 83 to disengage from the clamping slot 72, and then the arc spring 84 pulls the clamping block 83 back to the inside of the retraction chamber 82, and as the falling impact force of the falling rocks slows down, the mainspring 85 rebounds in the opposite direction, which can drive the second winding wheel 8 to rotate counterclockwise, and then the second tightening rope 61 is wound up by the second winding wheel 8, thereby moving one end of the second anti-falling net 6 to the other side, shrinking the opening above it, and preventing the falling rocks from rolling down.

[0049] Specifically, the working principle of the dangerous rock protection support structure is as follows: after the dangerous rock body 11 is fully protected by the protective net 2, as time goes by, the dangerous rock body 11 under the inner wall of the protective net 2 becomes loose and falls to the surface of the first anti-fall net 5, and the fallen stones fall and hit the first anti-fall net 5. Then the first anti-fall net 5 can pull the first winding wheel 36 through the first tightening rope 51, and the first winding wheel 36 can drive the first gear 312 through the crown gear 37 and the second gear 314 under the impact of the falling stones. Then the first gear 312 rotates, and after being threadedly connected to the threaded rod 34 through the threaded hole 313, the protective net 2 can be further tightened, so that the tension of the protective net 2 can be further strengthened.

[0050] After the first anti-fall net 5 is impacted by falling rocks and starts to fall, the first tightening rope 51 at one end of the first anti-fall net 5 can drive the second rotating wheel 43 when moving. After the second rotating wheel 43 rotates, the rack 45 can be engaged through the half gear 46. As the rack 45 moves, the deceleration plate 44 can be pulled so that the arc surface of the deceleration plate 44 can be fitted against the outer surface of the second rotating wheel 43, thereby achieving a certain deceleration effect on the first anti-fall net 5. An intermittent buffering effect can be achieved through the spring 47, the rack 45 and the half gear 46.

[0051] After the falling rocks from the dangerous rock mass 11 fall above the second anti-fall net 6, the falling impact force of the falling rocks drives the second winding wheel 8 to rotate clockwise through the second tightening rope 61, and then the rotating disk 81 can drive the clamping block 83 to disengage from the clamping slot 72, and then the arc spring 84 pulls the clamping block 83 back to the inside of the retraction chamber 82, and as the falling impact force of the falling rocks slows down, the mainspring 85 rebounds in the opposite direction, which can drive the second winding wheel 8 to rotate counterclockwise, and then the second tightening rope 61 is wound up by the second winding wheel 8, thereby moving one end of the second anti-fall net 6 to the other side, shrinking the opening above it, and preventing the falling rocks from rolling down.

[0052] The above are merely examples of the present application and are not intended to limit the scope of protection of the present application. For those skilled in the art, the present application may be subject to various modifications and variations. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application. It should be noted that similar reference numerals and letters represent similar items in the following figures. Therefore, once an item is defined in one figure, it does not need to be further defined or explained in subsequent figures.

[0053] The above are only specific embodiments of the present application, but the scope of protection of this application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A dangerous rock mass protection and retaining structure, comprising a parent rock (1) and a dangerous rock mass (11) with the side wall of the parent rock (1) protruding outward and in a suspended state, characterized in that: include: A first anti-falling net (5) is provided below the dangerous rock mass (11), and a first tightening rope (51) is provided at one end of the first anti-falling net (5), and a pull rod (3) is provided above the parent rock (1), and a rotatable first winding wheel (36) is provided on one side of the outer surface of the pull rod (3), and the first tightening rope (51) is wound around the outer surface of the first winding wheel (36). The surface of the dangerous rock mass (11) is covered with a protective net (2), and the upper and lower ends of the protective net (2) are respectively provided with pull ropes (21). The top wall and the side wall of the parent rock (1) are respectively fixed with a first base (12) and a second base (13), and support rods (4) are respectively provided on both sides of the front of the first base (12), and a right angle is formed between the support rod (4) and the first base (12). The other end of the support rod (4) is fixedly connected to a U-shaped frame (41), and a first rotating wheel (42) and a second rotating wheel (43) are provided between the inner side walls of the U-shaped frame (41), and a moving groove (48) is opened through the front of the U-shaped frame (41). At the same time, a deceleration plate (44) is provided between the inner walls of the U-shaped frame (41), and the deceleration plate (44) is located on one side of the outer surface of the second rotating wheel (43). Racks (45) are respectively provided on both sides of the outer surface of the deceleration plate (44), and the racks (45) pass through the moving groove (48). Half gears (46) are provided at both ends of the outer surface of the second rotating wheel (43), and the half gears (46) can be engaged with the racks (45), and a spring (47) is provided at one end of the rack (45).

2. The dangerous rock mass protection and retaining structure according to claim 1 is characterized in that: The two ends of the pull rod (3) are respectively threadedly connected to threaded rods (34), and the ends of the threaded rods (34) are fixedly provided with connectors (35). The connectors (35) provided at the two ends of the pull rod (3) can be connected to the pull rope (21) and the second base (13).

3. The dangerous rock mass protection and retaining structure according to claim 2 is characterized in that: A driving box (31) is fixedly provided at one end of the pull rod (3), and the interior of the driving box (31) is provided with a hollow structure. The first winding wheel (36) is provided on one side of the outer surface of the driving box (31). The driving box (31) and one end of the pull rod (3) are respectively provided with a positioning block (32), and the middle part of the positioning block (32) is a through-hollow structure. At the same time, the positioning block (32) located at one end of the pull rod (3) is provided with a rotatable nut (33).

4. The dangerous rock mass protection and retaining structure according to claim 3 is characterized in that: A crown gear (37) is fixedly provided on the first winding wheel (36) on one side of the outer surface of the drive box (31), and the crown gear (37) extends to the inner side wall of the drive box (31). A positioning rod (311) is fixedly provided on the inner wall of the drive box (31), and a first gear (312) is hingedly provided on the front face of the positioning rod (311), and a threaded hole (313) is provided through the front face of the first gear (312).

5. The dangerous rock mass protection and retaining structure according to claim 4 is characterized in that: The threaded hole (313) is threadedly connected to the threaded rod (34), and a second gear (314) is meshedly connected between the first gear (312) and the crown gear (37), and the diameter of the second gear (314) is smaller than that of the first gear (312).

6. The dangerous rock mass protection and retaining structure according to claim 5 is characterized in that: A second anti-falling net (6) is provided above the first anti-falling net (5).

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