A tunnel portal surrounding rock reinforcement system

Abstract

The present invention relates to the technical field of tunnel reinforcement, and discloses a surrounding rock reinforcement system for a tunnel portal section, comprising an arch frame, a partition guard plate, and a surrounding rock internal reinforcement component. Part of the arch frame is supported in the tunnel portal, and the rest of the arch frame extends out of the tunnel portal. The partition guard plate is vertically fixed on the top surface of the arch frame, and the partition guard plate is located outside the tunnel portal and conflicts with the surrounding rock surface above the tunnel portal. The surrounding rock internal reinforcement component comprises an anchor rod 1 and an anchor rod 2, wherein the anchor rod 1 passes through the partition guard plate from outside the tunnel and extends into the rock mass above the arch frame, and the anchor rod 2 passes through the arch frame from bottom to top in the tunnel portal and extends into the rock mass, and an anchor rod joint for connecting the anchor rod 1 and the anchor rod 2 is pre-buried in the rock mass. Part of the arch frame proposed by the present invention is supported in the tunnel portal, and the rest of the arch frame extends out of the tunnel portal. The part extending out of the portal can prevent safety accidents such as rolling stones and landslides from occurring above the rock mass, and the extended arch frame can serve as a support platform, which is convenient for construction personnel to clean the outer surface of the rock mass above the tunnel portal.

Description

Technical Field

[0001] The invention relates to the technical field of tunnel reinforcement, and in particular to a tunnel portal section surrounding rock reinforcement system. Background Art

[0002] Tunnel portal landslide is a common support instability disaster. The cause of landslide is related to geological survey, design and construction. The main purpose of tunnel portal surrounding rock reinforcement is to solve the problem of surrounding rock stability to prevent the displacement, collapse or rock burst of surrounding rock, so as to ensure the smooth construction and operation of tunnel.

[0003] At present, when anchor rods are used for reinforcement, holes are generally drilled in the rock surrounding rock, and anchor rods and curing materials are injected to connect the surrounding rock and the anchor rods together to enhance the overall strength of the surrounding rock. However, this reinforcement method is single in form, and each anchor rod works independently, failing to form an integral reinforcement structure in the surrounding rock. In addition, it is not convenient to construct anchor rods above the tunnel entrance, so there are certain difficulties in the construction. For this reason, the present invention proposes a tunnel entrance section surrounding rock reinforcement system to solve the above problems. Summary of the invention

[0004] In order to solve the technical problems raised in the background technology, the present invention provides a tunnel portal section surrounding rock reinforcement system.

[0005] The present invention is implemented by the following technical scheme: a tunnel portal section surrounding rock reinforcement system, including an arch frame, a partition guard plate and a surrounding rock internal reinforcement component.

[0006] Part of the arch is supported within the tunnel opening, while the rest extends out of the tunnel opening.

[0007] The partition guard plate is vertically fixed on the top surface of the arch frame, and the partition guard plate is located outside the tunnel opening and contacts the surrounding rock surface above the tunnel opening.

[0008] The internal reinforcement components of the surrounding rock include anchor rod 1 and anchor rod 2. Anchor rod 1 passes through the partition guard plate from outside the tunnel and extends into the rock mass above the arch frame. Anchor rod 2 passes through the arch frame from bottom to top from the tunnel entrance and extends into the rock mass. An anchor rod joint for connecting anchor rod 1 and anchor rod 2 is pre-buried in the rock mass.

[0009] As a further improvement of the above scheme, several groups of interconnected boreholes 1 and 2 are respectively opened in the rock mass above the tunnel entrance, the anchor joints are arranged at the connecting points of boreholes 1 and 2, and anchor 1 is arranged in borehole 1, and anchor 2 is arranged in borehole 2.

[0010] Through the above solution, the anchor rod can be easily installed, and the anchor rod one and the anchor rod two can be easily connected into one.

[0011] As a further improvement of the above scheme, the anchor rod joint is a cylindrical structure, the diameter of the anchor rod joint and the diameters of borehole one and borehole two are equal, a socket one is provided on one end face of the anchor rod joint, and a socket two is provided on the annular outer surface of the anchor rod joint. The socket one is used to be plugged into the end of the anchor rod one, and the socket two is used to be plugged into the end of the anchor rod two.

[0012] Through the above-mentioned anchor rod joint, the anchor rod one and the anchor rod two can be connected into one inside the rock mass to form a stable structure inside the rock mass.

[0013] As a further improvement of the above scheme, anchor rod 1 and anchor rod 2 are both hollow grouting anchor cables, and the end section of anchor rod 1 and the section of socket 1 are set to regular polygons of the same shape, and a plurality of alloy protrusions are distributed on the outer wall of the anchor rod joint.

[0014] By using the above-mentioned anchor rod joint, the anchor rod can be rotated to drive the anchor rod joint to rotate while penetrating into the borehole, thereby cleaning the inner wall of the borehole, making the anchor structure formed by the subsequent grouting more stable.

[0015] As a further improvement of the above scheme, a enclosure is provided on one side of the partition guard plate that is in contact with the rock mass, and the enclosure, the top surface of the arch frame and the outer surface of the surrounding rock together form a grouting space, and a grouting port is installed on the enclosure, and the grouting port is used to connect to external grouting equipment to pour concrete slurry into the grouting space.

[0016] Through the above scheme, a concrete arch structure can be formed after grouting by utilizing the grouting space, which can further stabilize the surrounding rock and play a good supporting and stabilizing role.

[0017] As a further improvement of the above scheme, reinforcing rods are installed on the side of the partition guard plate away from the rock mass, and the top ends of the reinforcing rods are connected to the partition guard plate through locking pieces, wherein: the bottom ends of the two reinforcing rods on both sides are respectively connected to auxiliary supporting mechanisms, and the bottom ends of the remaining reinforcing rods are fixed to the top of the arch frame.

[0018] Through the above scheme, the partition guard plate is further supported by utilizing the function of the reinforcing rod.

[0019] As a further improvement of the above scheme, the auxiliary support mechanism includes a pedal rod, an oblique support rod and a mounting seat. The mounting seat is arranged on a base plate fixed to the bottom of the arch frame. Two oblique support rods are provided and are parallel to each other. A number of pedal rods are fixed between the two oblique support rods. The bottom end of the reinforcing rod corresponding to the auxiliary support mechanism is connected to the pedal rod located at the top, and the two oblique support rods and the arch frame are fixed by bolts.

[0020] The auxiliary support mechanism mentioned above can not only support the force, but also facilitate construction workers to climb above the hole to carry out construction, thereby improving construction efficiency.

[0021] As a further improvement of the above scheme, a plug-in groove is opened in the middle of the arch frame, a support plate is embedded in the plug-in groove, and a plurality of through holes 1 for anchor rod 2 to pass through are distributed on the support plate. A through hole 2 for anchor rod 2 to pass through is opened at the top of the arch frame, and through hole 1 and through hole 2 correspond one to one.

[0022] The second through-hole is a "cross"-shaped hole, and a distance sensor is installed on the inner wall of the second through-hole. The distance sensor is used to detect whether the second anchor rod passing through the second through-hole is offset.

[0023] Through the above design, it is possible to monitor in real time whether the corresponding anchor rod 2 is deformed or displaced, thereby effectively predicting the stability of the rock mass at the tunnel entrance and further improving safety.

[0024] As a further improvement of the above scheme, a stabilizing assembly is provided on the support plate to clamp and guide the anchor rod 2 passing through the through hole 1, and the stabilizing assembly includes several groups of stabilizing mechanisms and a power mechanism that drives the stabilizing mechanisms to move; the stabilizing mechanism includes two relatively arranged clamping seats, and clamping grooves are provided at the same position on the adjacent sides of the two clamping seats, and side plates are provided at the opposite ends of the two clamping seats, and when the two clamping seats are in contact, the two clamping grooves can contact the outer wall of the anchor rod 2, and the power mechanism is used to drive the movement of the two clamping seats in each stabilizing mechanism.

[0025] Through the above structure, the stabilizing mechanism can be conveniently used to smoothly and accurately install the second anchor rod into the second borehole, and the second anchor rod can pass through the second perforation, thereby effectively monitoring the anchor rod.

[0026] As a further improvement of the above solution, the power mechanism includes a power output module and a power input module;

[0027] The power output module includes two clamping plates arranged opposite to each other, and a "V"-shaped clamping block is arranged on the opposite side of the two clamping plates, and the clamping block clamps two adjacent side plates therein;

[0028] The power input module includes a screw rod 1 and a screw rod 2 arranged in parallel, and a crank 1 and a crank 2 respectively driving the screw rod 1 and the screw rod 2 to rotate; the screw rod 1 and the screw rod 2 are both spaced apart with a thread segment 1 and a thread segment 2 with opposite spiral directions; one of the splints in each power output module is spirally connected to the thread segment 1, and the other splint in the power output module is spirally connected to the thread segment 2.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] The arch frame proposed by the present invention is partially supported in the tunnel opening, and the rest of the arch frame extends out of the tunnel opening. The part extending out of the tunnel opening can prevent safety accidents such as rock rolling and landslides from occurring above the rock mass, and the extended arch frame can serve as a supporting platform, making it convenient for construction workers to clean the outer surface of the rock mass above the tunnel opening.

[0031] The end of the anchor rod one of the present invention can be connected to the anchor rod joint, and the anchor rod two is connected to the socket two on the anchor rod joint after passing through the drill hole two, so that the anchor rod one and the anchor rod two can be connected into one inside the rock mass through the above-mentioned anchor rod joint to form a stable structure inside the rock mass. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is an axonometric view of the overall structure of the reinforcement system proposed by the present invention;

[0033] Figure 2 This is a three-dimensional structural diagram of the reinforcement system proposed by the present invention when viewed from the other side;

[0034] Figure 3 A side view of the reinforcement system proposed by the present invention;

[0035] Figure 4 This is a schematic diagram of the structure of the reinforcement system proposed by the present invention after the arch frame is removed;

[0036] Figure 5 For the present invention Figure 4 A in the enlarged view;

[0037] Figure 6 A schematic diagram of a portion of the structure of the rock mass above the arch proposed in the present invention;

[0038] Figure 7 This is a schematic diagram of the top view of the stabilizing assembly proposed in the present invention.

[0039] Description of main symbols:

[0040] In the figure: 1. arch frame; 2. support plate; 3. bottom plate; 4. pedal; 5. oblique support rod; 6. mounting seat; 7. reinforcing rod; 8. partition guard plate; 9. locking piece; 10. anchor rod one; 11. anchor rod joint; 12. perforation two; 14. grouting port; 15. enclosure; 16. screw rod one; 17. clamping block; 18. clamping plate; 19. clamping seat; 20. side plate; 21. screw rod two; 22. anchor rod two; 23. stabilizing assembly; 24. through hole; 25. rock mass; 26. borehole one; 27. borehole two; 28. threaded segment one; 29. ​​threaded segment two. DETAILED DESCRIPTION

[0041] The present invention is further described below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form a new embodiment.

[0042] Example 1: Reference Figure 1-Figure 7 , this scheme proposes a tunnel portal section surrounding rock reinforcement system, including an arch frame 1, a partition guard plate 8 and surrounding rock internal reinforcement components.

[0043] Part of the arch frame 1 is supported in the tunnel opening, and the rest of the arch frame extends out of the tunnel opening. The part extending out of the opening can prevent safety accidents such as rock rolling and landslides from occurring above the surrounding rock, and the extended arch frame can serve as a supporting platform, making it convenient for construction workers to clean the outer surface of the surrounding rock above the tunnel opening.

[0044] The partition guard plate 8 is vertically fixed on the top surface of the arch frame 1, and the partition guard plate 8 is located outside the tunnel opening and contacts the surrounding rock surface above the tunnel opening. A plurality of triangular plates can be provided between the partition guard plate 8 and the top surface of the arch frame 1 for support, so that the structure of the partition guard plate 8 is more stable.

[0045] Reference Figure 1-Figure 3 The internal reinforcement components of the surrounding rock include anchor rod 10 and anchor rod 22. Anchor rod 10 passes through the partition guard plate 8 from outside the tunnel and extends into the rock mass 25 above the arch frame 1. Anchor rod 22 passes through the arch frame 1 from bottom to top from the tunnel entrance and extends into the rock mass 25. An anchor rod joint 11 for connecting anchor rod 10 and anchor rod 22 is pre-buried in the rock mass 25.

[0046] Reference Figure 6 As an optional embodiment of the present invention, a plurality of groups of interconnected boreholes 26 and boreholes 27 are respectively opened in the rock mass 25 above the tunnel entrance, and the anchor rod joint 11 is arranged at the connection between the boreholes 26 and the boreholes 27, and the anchor rod 10 is arranged in the borehole 26, and the anchor rod 22 is arranged in the borehole 27. The boreholes 26 and 27 are both constructed by existing drilling equipment, and before drilling, the side surface needs to be cleaned to make the surface smoother and flatter.

[0047] As an optional implementation of the first scheme, the anchor rod joint 11 is a cylindrical structure, the diameters of the anchor rod joint 11 and the borehole 1 26 and the borehole 27 are equal, a plug hole 1 is provided on one end surface of the anchor rod joint 11, and a plug hole 2 is provided on the annular outer surface of the anchor rod joint 11, the plug hole 1 is used to plug with the end of the anchor rod 10, and the plug hole 2 is used to plug with the end of the anchor rod 22. And when the anchor rod joint 11 is installed to the deepest part of the borehole 1 26, the plug hole 2 can be connected to the borehole 27, so that the anchor rod 22 can pass through the borehole 27 and connect with the plug hole 2, so that the anchor rod 10 and the anchor rod 22 can be connected into one body inside the rock mass 25 through the above-mentioned anchor rod joint 11, forming a stable structure inside the rock mass 25.

[0048] It should be noted that both anchor rod 10 and anchor rod 22 are hollow grouting anchor cables, and the end section of anchor rod 10 and the section of socket 1 are set to be regular polygons of the same shape, and a plurality of alloy material protrusions are distributed on the outer wall of anchor rod joint 11. In this way, it is convenient to rotate anchor rod 10 to drive anchor rod joint 11 to rotate, thereby facilitating the adjustment of the position of anchor rod joint 11 for docking anchor rods.

[0049] Furthermore, the anchor rod 10 can be rotated by the anchor rod joint 11, driving the anchor rod joint 11 to rotate while penetrating into the borehole 26, thereby cleaning the inner wall of the borehole, making the anchor structure formed by the subsequent grouting more stable.

[0050] As an optional embodiment of the present invention, a side of the partition guard plate 8 that is in contact with the rock mass 25 is provided with a panel 15, and the panel 15, the top surface of the arch frame 1, and the outer surface of the surrounding rock together form a grouting space, and a grouting port 14 is installed on the panel 15, and the grouting port 14 is used to connect to an external grouting device to inject concrete slurry into the grouting space. In this way, a concrete arch structure can be formed after grouting in the grouting space, which further stabilizes the surrounding rock and plays a good supporting and stabilizing role.

[0051] As an optional embodiment of the present invention, a reinforcing rod 7 is installed on the side of the partition guard plate 8 away from the rock mass 25, and the top of the reinforcing rod 7 is connected to the partition guard plate 8 through a locking member 9, wherein: the bottom ends of the two reinforcing rods 7 located on both sides are respectively connected to auxiliary support mechanisms, and the bottom ends of the remaining reinforcing rods 7 are fixed to the top of the arch frame 1. The reinforcing rod 7 is used to further support the partition guard plate 8.

[0052] In the present embodiment, the auxiliary support mechanism includes a pedal rod 4, an inclined support rod 5 and a mounting seat 6. The mounting seat 6 is arranged on a base plate 3 fixed to the bottom of the arch frame 1. Two inclined support rods 5 are provided and are parallel to each other. A plurality of pedal rods 4 are fixed between the two inclined support rods 5. The bottom end of the reinforcing rod 7 corresponding to the auxiliary support mechanism is connected to the pedal rod 4 located at the top, and the two inclined support rods 5 and the arch frame 1 are fixed by bolts. Specifically, a through hole 24 is opened on the inclined support rod 5, and the above-mentioned bolt is installed at the through hole 24, and the bolt and the arch frame 1 are connected.

[0053] The auxiliary support mechanism mentioned above can not only provide support and force, but also facilitate construction workers to climb above the hole to carry out construction, thereby improving construction efficiency.

[0054] In order to facilitate the installation of the second anchor rod 22, a plug-in slot is provided in the middle of the arch frame 1, a support plate 2 is embedded in the plug-in slot, a plurality of through holes 1 for the second anchor rod 22 to pass through are distributed on the support plate 2, and a through hole 2 12 for the second anchor rod 22 to pass through is provided at the top of the arch frame 1, and the through holes 1 and the through holes 12 correspond to each other one by one;

[0055] The second through hole 12 is a cross-shaped hole, and a distance sensor is installed on the inner wall of the second through hole 12 . The distance sensor is used to detect whether the second anchor rod 22 passing through the second through hole 12 is offset.

[0056] Specifically, two groups of infrared ranging sensors can be installed at the four ends of the second perforation 12, and each group of infrared ranging sensors are arranged relatively to each other to measure whether the anchor rod 22 is offset in this direction. The infrared ranging sensor can be electrically connected to an external controller. If the offset exceeds the set value, the controller can control the alarm connected to it to sound an alarm. The specific alarm can be installed on the outer rock wall of the tunnel entrance, which can be displayed more clearly and have a better early warning effect. A battery pack can be installed on the support plate 2 to power the entire system. The battery pack can be charged or replaced regularly to ensure long-term and effective operation, thereby effectively predicting the stability of the surrounding rock at the tunnel entrance and further improving safety.

[0057] As an optional embodiment of the present invention, a stabilizing component 23 is provided on the support plate 2 to clamp and guide the anchor rod 22 passing through the through hole 1, and the stabilizing component 23 includes a plurality of stabilizing mechanisms and a power mechanism for driving the stabilizing mechanisms to move; the stabilizing mechanisms include two relatively arranged clamping seats 19, and clamping grooves are provided at the same position on the adjacent sides of the two clamping seats 19, and side plates 20 are provided at the opposite ends of the two clamping seats 19, and when the two clamping seats 19 are in contact, the two clamping grooves can contact the outer wall of the anchor rod 22, and the power mechanism is used to drive the two clamping seats 19 in each stabilizing mechanism to move.

[0058] Through the above structure, the second anchor rod 22 can be conveniently and accurately installed into the second borehole 27 by utilizing the stabilizing mechanism, and the second anchor rod 22 can pass through the second through hole 12, so as to effectively monitor the anchor rod.

[0059] Reference Figure 4 , Figure 5 and Figure 7 In this scheme, the power mechanism includes a power output module and a power input module. The power output module includes two oppositely arranged clamping plates 18, and "V"-shaped clamping blocks 17 are arranged on the opposite sides of the two clamping plates 18, and the clamping blocks 17 clamp two adjacent side plates 20 therein. The power input module includes a screw rod 16 and a screw rod 21 arranged in parallel, and a crank handle 1 and a crank handle 2 for driving the screw rod 16 and the screw rod 21 to rotate respectively; the screw rod 16 and the screw rod 21 are both spaced apart with thread segments 1 28 and thread segments 2 29 with opposite screw directions; one of the clamping plates 18 in each power output module is spirally connected to the thread segment 1 28, and the other clamping plate 18 in the power output module is spirally connected to the thread segment 2 29.

[0060] It should be noted that the screw rod 16 and the screw rod 21 can be controlled to rotate forward and reverse by turning the crank, thereby driving the clamping plates 18 in each power output module to move closer or farther away from each other, and finally making the clamping seat 19 slide on the support plate 2, and the support plate 2 is provided with a slide groove connected to the clamping seat 19, and a return spring connected to the clamping seat 19 is installed in the slide groove, so as to facilitate the automatic reset of the clamping seat 19. And when the drill rod 2 is installed and the grouting is completed, the clamping seat 19 is tightly clamped on the bottom outer side of the anchor rod 22, and the clamping seat 19 can play a supporting and stable role.

[0061] The above-mentioned embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.

Claims

1. A tunnel portal surrounding rock reinforcement system, characterized in that: It includes arch frames, partition guard plates and internal reinforcement components of surrounding rocks; A portion of the arch is supported in the tunnel opening, and the rest of the arch extends out of the tunnel opening; The partition guard plate is vertically fixed to the top surface of the arch frame, and the partition guard plate is located outside the tunnel opening and contacts the surrounding rock surface above the tunnel opening; The surrounding rock internal reinforcement assembly includes an anchor rod 1 and an anchor rod 2, wherein the anchor rod 1 passes through the partition guard plate from outside the tunnel and extends into the rock mass above the arch frame, and the anchor rod 2 passes through the arch frame from bottom to top in the tunnel opening and extends into the rock mass, and an anchor rod joint for connecting the anchor rod 1 and the anchor rod 2 is pre-buried in the rock mass; A plurality of groups of mutually connected boreholes 1 and 2 are respectively opened in the rock mass above the tunnel entrance, the anchor rod joint is arranged at the connecting part of the boreholes 1 and 2, and the anchor rod 1 is arranged in the borehole 1, and the anchor rod 2 is arranged in the borehole 2; The anchor rod joint is a cylindrical structure, the diameters of the anchor rod joint and the borehole 1 and the borehole 2 are equal, a first plug hole is provided on one end surface of the anchor rod joint, and a second plug hole is provided on the annular outer surface of the anchor rod joint, the first plug hole is used to be plugged with the end of the anchor rod 1, and the second plug hole is used to be plugged with the end of the anchor rod 2; The anchor rod 1 and the anchor rod 2 are both hollow grouting anchor cables, and the end section of the anchor rod 1 and the section of the socket 1 are regular polygons of the same shape, and a plurality of alloy protrusions are distributed on the outer wall of the anchor rod joint.

2. A tunnel portal surrounding rock reinforcement system as claimed in claim 1, characterized in that: A enclosure is provided on one side of the partition guard plate that is in contact with the rock mass. The enclosure, the top surface of the arch frame and the outer surface of the surrounding rock together form a grouting space, and a grouting port is installed on the enclosure. The grouting port is used to connect to external grouting equipment to pour concrete slurry into the grouting space.

3. A tunnel portal surrounding rock reinforcement system as claimed in claim 2, characterized in that: A reinforcing rod is installed on the side of the partition guard plate away from the rock mass, and the top of the reinforcing rod is connected to the partition guard plate through a locking piece, wherein: the bottom ends of the two reinforcing rods on both sides are respectively connected to auxiliary supporting mechanisms, and the bottom ends of the remaining reinforcing rods are fixed to the top of the arch frame.

4. A tunnel portal surrounding rock reinforcement system as claimed in claim 3, characterized in that: The auxiliary support mechanism includes a pedal rod, an oblique support rod and a mounting seat. The mounting seat is arranged on a base plate fixed to the bottom of the arch frame. Two oblique support rods are provided and are parallel to each other. A plurality of pedal rods are fixed between the two oblique support rods. The bottom end of the reinforcing rod corresponding to the auxiliary support mechanism is connected to the pedal rod located at the top, and the two oblique support rods and the arch frame are fixed by bolts.

5. A tunnel portal surrounding rock reinforcement system as claimed in claim 4, characterized in that: A plug-in slot is provided in the middle of the arch frame, a support plate is embedded in the plug-in slot, a plurality of through-holes 1 for the second anchor rod to pass through are distributed on the support plate, and a through-hole 2 for the second anchor rod to pass through is provided on the top of the arch frame, and the through-holes 1 and 2 correspond to each other one by one; The second through hole is a "cross" shaped hole, and a distance sensor is installed on the inner wall of the second through hole, and the distance sensor is used to detect whether the second anchor rod passing through the second through hole is offset.

6. A tunnel portal surrounding rock reinforcement system as claimed in claim 5, characterized in that: The support plate is provided with a stabilizing assembly to clamp and guide the anchor rod 2 passing through the through hole 1; The stabilizing assembly includes several groups of stabilizing mechanisms and a power mechanism that drives the stabilizing mechanisms to move; the stabilizing mechanism includes two relatively arranged clamping seats, and clamping grooves are provided at the same position on the adjacent sides of the two clamping seats, and side plates are provided at the opposite ends of the two clamping seats, and when the two clamping seats are in contact, the two clamping grooves can contact the outer wall of the second anchor rod, and the power mechanism is used to drive the two clamping seats in each stabilizing mechanism to move.

7. A tunnel portal surrounding rock reinforcement system as claimed in claim 6, characterized in that: The power mechanism includes a power output module and a power input module; The power output module includes two clamping plates arranged opposite to each other, and a "V"-shaped clamping block is arranged on the opposite side of the two clamping plates, and the clamping block clamps two adjacent side plates therein; The power input module includes a screw rod 1 and a screw rod 2 arranged in parallel, and a crank 1 and a crank 2 respectively driving the screw rod 1 and the screw rod 2 to rotate; the screw rod 1 and the screw rod 2 are both spaced apart with a thread segment 1 and a thread segment 2 with opposite spiral directions; one of the splints in each power output module is spirally connected to the thread segment 1, and the other splint in the power output module is spirally connected to the thread segment 2.

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