A slope support device and construction method for tunnel excavation

Abstract

This invention discloses a slope support device and construction method for tunnel excavation, comprising an outer shell and an inner rod slidably connected to the inner wall of the outer shell. A fixing mechanism is provided inside the outer shell. A threaded sleeve is provided at one end of the inner rod, and an end cap is provided at the end of the inner rod away from the threaded sleeve. Several triangular contact blocks are fixedly installed on one side of the end cap. A running cavity is opened inside the end cap, and a stabilizing mechanism is provided inside the running cavity. A fixing disc is rotatably installed at the end of the inner rod away from the threaded sleeve, and a damping spring is fixedly installed on the side of the fixing disc away from the inner rod. By setting up a fixing mechanism, this invention enables the anchor rod to be more securely fixed in the borehole and less prone to slippage when tightening the anchor mesh. Simultaneously, when the pressure increases, the fixing mechanism can form a stable triangular body, further ensuring the stability of the anchor rod, thereby achieving the effect of good support and anti-slippage.

Description

Technical Field

[0001] This invention relates to the field of slope protection technology, and in particular to a slope protection device and construction method for tunnel excavation. Background Technology

[0002] Slope protection devices for tunnel excavation are a general term for a class of devices that prevent landslides, collapses, and rockfalls on slopes by means of mechanical reinforcement and structural interception, thereby protecting the safety of tunnel construction and operation.

[0003] When supporting the slope of a tunnel excavation, anchor bolts are usually placed into pre-drilled holes, then the anchor bolts are fixed, followed by the installation and tightening of wire mesh, and finally concrete spraying, thus completing the support of the tunnel excavation slope.

[0004] However, due to the slope gradient and the drilling angle, some anchor bolts are placed at an upward angle. This inclination can cause the anchor bolts to slide outwards when fixing them and hanging the mesh. In addition, some workers mark the anchor bolts to ensure accurate placement depth, which reduces work efficiency. Some workers even place the anchor bolts without marking them, resulting in some anchor bolts not being placed to the required depth and creating safety hazards.

[0005] Meanwhile, after the anchor bolts are placed, they may loosen due to insufficient friction between the outer side of the anchor bolts and the borehole wall, which will affect the support effect.

[0006] Therefore, we provide a slope support device and construction method for tunnel excavation. Summary of the Invention

[0007] The purpose of this invention is to address the aforementioned technical problems by providing a slope support device and construction method for tunnel excavation, achieving the effects of good support, anti-slip, and qualified anchor placement.

[0008] In view of this, the present invention provides a slope support device and construction method for tunnel excavation, including an outer shell and an inner rod that slides in contact with the inner wall of the outer shell. The outer shell is provided with a fixing mechanism. One end of the inner rod is provided with a threaded sleeve. The end of the inner rod away from the threaded sleeve is provided with an end head. Several triangular contact blocks are fixedly installed on one side of the end head.

[0009] The end has an internal running cavity, and a stabilizing mechanism is provided inside the running cavity;

[0010] A fixed plate is rotatably mounted on the end of the inner rod away from the threaded sleeve. A damping spring is fixedly mounted on the side of the fixed plate away from the inner rod. The end of the damping spring away from the fixed plate is fixedly connected to the inner wall of the running cavity.

[0011] Preferably, a cone block is fixedly installed on the outer side of the end of the outer shell, one end of the cone block is attached to a tray, and the side of the tray away from the cone block is attached to one end of the threaded sleeve.

[0012] Preferably, the outer shell has a plurality of movable grooves inside near the end, and the inner walls of the movable grooves have sliding grooves on opposite sides.

[0013] Preferably, the fixing mechanism includes a fixing frame, a flap groove is provided on the upper side of the fixing frame, a flap is provided inside the flap groove, rotating rods are rotatably connected to opposite sides of the inner wall of the flap groove, the end of the rotating rod away from the inner wall of the flap groove is fixedly connected to the opposite sides of the flap, a fixing block is fixedly installed on the outer side of the end of the flap, and an inclined block is fixedly installed on the lower surface of the fixing frame.

[0014] Preferably, the inclined block is inclined, and the thickness of one end of the flip plate is less than the thickness of the end of the flip plate away from the fixed block.

[0015] Preferably, a sliding rod is fixedly installed on the opposite two sides of the fixed frame, and the end of the sliding rod away from the fixed frame slides against the inner wall of the groove.

[0016] Preferably, the stabilizing mechanism includes a turntable, the turntable having a plurality of limiting grooves on its periphery, a support block being inserted into the limiting groove, and guide grooves being opened on the opposite two sides of the support block.

[0017] Preferably, isolation plates are slidably attached to both opposite surfaces of the turntable. The isolation plates, the interior of the turntable, the inner rod, the damping spring, and the outer side of the fixed plate are slidably attached. The periphery of the isolation plates is fixedly connected to the inner wall of the running cavity. A guide rod is fixedly installed inside the end, and the end of the guide rod away from the interior of the end is slidably attached to the inner wall of the guide groove.

[0018] Preferably, the inner wall of the threaded sleeve is provided with a large-circle thread, the inner wall of the end of the threaded sleeve is provided with a small-circle thread, the outer side of the end of the inner rod is provided with a fastening thread, the outer side of the end of the outer shell is provided with a fixing thread, the fastening thread is threadedly connected to the small-circle thread, the fixing thread is threadedly connected to the large-circle thread, a push block is fixedly installed on the outer side of the end of the inner rod away from the fastening thread, an inner rod groove is provided on the outer side of the inner rod, and the push block is inclined.

[0019] The construction method for slope support devices during tunnel excavation includes the following steps:

[0020] Step 1: End fixing: The end stops rotating, the limiting groove presses against the support block, the support block moves to the outside of the turntable, the outer surface of the turntable pushes the support block, one end of the support block moves to the outside of the outer shell, and the end fixing is completed;

[0021] Step 2: Secure the mesh: Place the tray on the outside of the outer shell and inner rod, and tighten the threaded sleeve;

[0022] Step 3: Fixing the outer shell and inner rod: The large-circle thread is connected to the fixed thread, and the small-circle thread is connected to the fastening thread. The inner rod moves, the push block presses against the inclined block, the inclined block moves to the outside of the outer shell, and the outer shell and inner rod are fixed.

[0023] Step 4: Secondary fixing: The fixing block is pushed, the outer shell and inner rod move, the fixing block is pushed, the flip plate rotates, the flip plate and the fixing frame form a triangle, and the secondary fixing is completed.

[0024] Compared with the prior art, the present invention provides a slope support device and construction method for tunnel excavation, which has the following beneficial effects:

[0025] This invention, by setting a fixing mechanism, enables the anchor rod to be more securely fixed in the borehole and less prone to slippage when tightening the anchor mesh. At the same time, when the pressure increases, the fixing mechanism can form a stable triangular body, further ensuring the stability of the anchor rod, thereby achieving the effect of good support and anti-slippage.

[0026] This invention, by setting a stabilizing mechanism, can stop the deployment by touching the bottom of the end, thereby stabilizing the anchor rod in the borehole before hanging the anchor net, thus achieving the effects of good support, anti-slip, and qualified anchor rod placement.

[0027] This invention, by setting a threaded sleeve, can tighten the inner rod by tightening the threaded sleeve, making the anchor rod more secure in the borehole, and at the same time fix the anchor mesh, ensuring the stability of the anchor mesh, thereby achieving the effect of good support and anti-slip.

[0028] This invention, by setting a damping spring and a fixing plate, can prevent the inner rod from moving too early during the placement of the anchor rod, thus avoiding premature operation of the fixing mechanism, and can also support the rotation of the inner rod, thereby achieving a good support effect.

[0029] The parts of this device not covered herein are the same as or can be implemented using existing technologies. This invention has a simple structure and is easy to operate. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the overall structure of a slope support device and construction method for tunnel excavation proposed in this invention.

[0031] Figure 2 This is an enlarged schematic diagram of point A of the slope support device and construction method for tunnel excavation proposed in this invention.

[0032] Figure 3This is a schematic diagram of the outer shell structure of a slope support device and construction method for tunnel excavation proposed in this invention.

[0033] Figure 4 This is an enlarged schematic diagram of section B of the slope support device and construction method for tunnel excavation proposed in this invention.

[0034] Figure 5 This is a schematic diagram of the end section structure of a slope support device and construction method for tunnel excavation proposed in this invention.

[0035] Figure 6 This is an enlarged schematic diagram of section C of the slope support device and construction method for tunnel excavation proposed in this invention.

[0036] Figure 7 This is a schematic diagram of the inner rod structure of a slope support device and construction method for tunnel excavation proposed in this invention.

[0037] Figure 8 This is an enlarged schematic diagram of point D of the slope support device and construction method for tunnel excavation proposed in this invention.

[0038] Figure 9 This is a schematic diagram of the outer shell cross-section structure of a slope support device and construction method for tunnel excavation proposed in this invention.

[0039] Figure 10 This is a schematic diagram of the cross-sectional structure of a threaded sleeve for a slope support device and construction method for tunnel excavation proposed in this invention.

[0040] Figure 11 This is a schematic diagram of the fixing mechanism structure of a slope support device and construction method for tunnel excavation proposed in this invention.

[0041] Figure 12 This is a cross-sectional schematic diagram of the fixing mechanism of a slope support device and construction method for tunnel excavation proposed in this invention.

[0042] Figure 13 This is an enlarged schematic diagram of the structure at point E, which is a slope support device and construction method for tunnel excavation proposed in this invention.

[0043] Figure 14 This is a schematic diagram of the fixed mechanism of a slope support device and construction method for tunnel excavation proposed in this invention.

[0044] In the diagram: 1. Outer shell; 101. Fixed thread; 102. Moving groove; 103. Sliding groove; 2. Conical block; 3. Tray; 4. Threaded sleeve; 41. Large circle thread; 42. Small circle thread; 5. Fixing mechanism; 51. Fixing frame; 52. Inclined block; 53. Flip plate; 54. Fixing block; 55. Rotating rod; 56. Flip plate groove; 57. Sliding rod; 6. Stabilizing mechanism; 61. Turntable; 62. Support block; 63. Guide groove; 64. Guide rod; 65. Limiting groove; 66. Isolation plate; 7. End; 71. Running cavity; 72. Contact block; 11. Inner rod; 111. Fastening thread; 112. Inner rod groove; 113. Push block; 12. Damping spring; 13. Fixed plate. Detailed Implementation

[0045] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0046] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0047] Example: A slope support device and construction method for tunnel excavation, such as... Figures 1-14 As shown, the device includes a housing 1 and an inner rod 11 that slides against the inner wall of the housing 1. An inner rod groove 112 is provided on the outer side of the inner rod 11, providing space for the fixing mechanism 5. This ensures that the fixing mechanism 5 will not jam due to outward extension when the inner rod 11 and housing 1 are placed. A push block 113 is fixedly installed on the outer side of the end of the inner rod 11 away from the fastening thread 111. The push block 113 converts the axial movement of the inner rod 11 into radial movement, thus ensuring the anchor rod is stable within the borehole. 3 is inclined, and the end of the push block 113 that first contacts the inclined block 52 is arc-shaped, thereby reducing friction, reducing resistance, and ensuring the smooth movement of the inclined block 52. The outer side of the end of the inner rod 11 is provided with a fastening thread 111, which is threaded to the small circle thread 42. The outer side of the end of the outer shell 1 is provided with a fixing thread 101, which is threaded to the large circle thread 41. Several moving grooves 102 are provided inside the outer shell 1 near the end 7. Sliding grooves 103 are provided on both sides of the inner wall of the moving grooves 102.

[0048] A cone block 2 is fixedly installed on the outer side of the end of the outer shell 1. A tray 3 is attached to one end of the cone block 2. The cone block 2 and the tray 3 are used together to fix the anchor net. The anchor net is existing technology and will not be described in detail here, nor is it shown in the figure. The side of the tray 3 away from the cone block 2 is attached to one end of the threaded sleeve 4. The outer shell 1 is provided with a fixing mechanism 5. The fixing mechanism 5 includes a fixing frame 51. Slide rods 57 are fixedly installed on the opposite two surfaces of the fixing frame 51. The end of the slide rod 57 away from the fixing frame 51 slides against the inner wall of the slide groove 103. An inclined block 52 is fixedly installed on the lower surface of the fixing frame 51. A magnet is embedded in the inclined block 52 on the side near the inner rod 11. The magnet can ensure the stability of the inclined block 52 when rotating and placing the anchor rod, and prevent the inclined block 52 from unfolding too early due to centrifugal force, which would prevent the anchor rod from being placed. The magnet is existing technology and will not be described in detail here, nor is it shown in the figure.

[0049] The inclined block 52 is inclined. A flap groove 56 is provided on the upper side of the fixed frame 51. A flap 53 is provided inside the flap groove 56. The thickness of one end of the flap 53 is less than the thickness of the end of the flap 53 away from the fixed block 54. Rotating rods 55 are rotatably connected to opposite sides of the inner wall of the flap groove 56. The end of the rotating rod 55 away from the inner wall of the flap groove 56 is fixedly connected to the opposite sides of the flap 53. A fixed block 54 is fixedly installed on the outer side of the end of the flap 53. A threaded sleeve 4 is provided at one end of the inner rod 11. A large-circle thread 41 is provided on the inner wall of the threaded sleeve 4. A small-circle thread 42 is provided on the inner wall of the end of the threaded sleeve 4. An end head 7 is provided at the end of the inner rod 11 away from the threaded sleeve 4. The end head 7 is connected to... When the contact block 72 contacts the bottom wall of the borehole, the friction is relatively large. At this time, the friction will be greater than the friction between the support block 62 and the limiting groove 65. At this time, the end 7 will stop rotating and the limiting groove 65 and the support block 62 will separate. The moment of separation will generate vibration and jolt. At this time, the worker can stop the operation of the anchor bolt machine. The distance between the limiting groove 65 and the other limiting groove 65 can ensure the short-term inertial rotation space after the machine stops. Thus, the vibration transmitted can be used to determine whether the anchor bolt is placed in place. A guide rod 64 is fixedly installed inside the end 7. The end of the guide rod 64 away from the inside of the end 7 slides against the inner wall of the guide groove 63.

[0050] Several triangular contact blocks 72 are fixedly installed on one side of the end head 7. The stability of triangular shapes is well-known and will not be elaborated upon here. Furthermore, the triangular contact blocks 72 ensure that a pause-like vibration occurs when in contact with the bottom wall of the borehole, while simultaneously increasing friction to immediately stop the rotation of the end head 7. An operating cavity 71 is provided inside the end head 7, and a stabilizing mechanism 6 is provided inside the operating cavity 71. The stabilizing mechanism 6 includes a turntable 61, with isolation plates 66 slidably attached to both opposite surfaces of the turntable 61. When the inner rod 11 moves, the isolation plates 66 can limit the turntable 61, allowing the turntable 61 and the inner rod 11 to move only axially. The periphery of the isolation plates 66 is fixedly connected to the inner wall of the operating cavity 71. The isolation plates 66, the interior of the turntable 61, the inner rod 11, the damping spring 12, and the fixed plate 13 are all connected. The outer side slides, and the turntable 61 has several limiting grooves 65 on its circumference. A support block 62 is inserted into the limiting groove 65. The support block 62 has guide grooves 63 on its opposite two sides. A fixed plate 13 is rotatably installed on the end of the inner rod 11 away from the threaded sleeve 4. A damping spring 12 is fixedly installed on the side of the fixed plate 13 away from the inner rod 11.

[0051] The damping spring 12 ensures that the inner rod 11 remains stable inside the outer shell 1 when the anchor mesh is not tightened. The end of the damping spring 12 away from the fixed plate 13 is fixedly connected to the inner wall of the running cavity 71. The anchor rod is placed in the pre-drilled hole by an anchor rod machine. The anchor rod machine and anchor mesh are existing technologies and will not be described in detail here, nor are they shown in the figure. The outer shell 1, the inner rod 11, and the end 7 of this application together form the function of the anchor rod.

[0052] In this embodiment, the construction method of the slope support device for tunnel excavation includes the following steps: Step 1: End fixing: End 7 stops rotating, the limiting groove 65 presses against the support block 62, the support block 62 moves to the outside of the turntable 61, the outer surface of the turntable 61 pushes the support block 62, one end of the support block 62 moves to the outside of the outer shell 1, and the end 7 is fixed.

[0053] Step 2: Fastening the mesh: The tray 3 is fitted onto the outside of the outer shell 1 and the inner rod 11, and the threaded sleeve 4 is tightened.

[0054] Step 3: Fixing the outer shell and inner rod: The large circle thread 41 is threaded to the fixing thread 101, and the small circle thread 42 is threaded to the fastening thread 111. The inner rod 11 moves, the push block 113 presses against the inclined block 52, and the inclined block 52 moves to the outside of the outer shell 1. The outer shell 1 and the inner rod 11 are then fixed.

[0055] Step 4: Secondary fixing: The fixing block 54 is pushed, the outer shell 1 and the inner rod 11 move, the fixing block 54 is pushed, the flip plate 53 rotates, the flip plate 53 and the fixing frame 51 form a triangle, and the secondary fixing is completed.

[0056] Working principle: When performing slope protection, the anchor bolt is first inserted into the pre-drilled hole using an anchor bolt machine. Initially, the support block 62 is located inside the limiting groove 65. At this point, the rotational force is less than the frictional force between the limiting groove 65 and the support block 62. Therefore, the outer shell 1 and inner rod 11 rotate, causing the end 7 to rotate. When the end 7 rotates to the innermost part of the borehole, the contact blocks 72 on the end 7 contact the inner wall of the borehole. The rotation of the outer shell 1 and inner rod 11 allows several contact blocks 72 to continue generating rotational force with the inner wall of the borehole. Simultaneously, the frictional force between the contact blocks 72 and the inner wall of the borehole is relatively large, causing the end 7 to stop rotating. The rotational force of the continuously rotating turntable 61 is greater than the frictional force between the support block 62 and the limiting groove 65. At this time, the limiting groove 65 can squeeze the support block 62. With the cooperation of the guide rod 64 and the guide groove 63, the support block 62 moves to the outside of the end 7 and contacts the inner wall of the borehole, thereby increasing the frictional force between the end 7 and the inner wall of the borehole. This prevents the outer shell 1 and the inner rod 11 from loosening due to the loosening of the end 7. Then, the anchor bolting machine is stopped, and the anchor net is hung. First, the anchor net is placed between the cone block 2 and the tray 3, then the threaded sleeve 4 is inserted, and then the threaded sleeve 4 is screwed. At this time, the large-circle thread 41 inside the threaded sleeve 4... The small-circle thread 42 is threadedly connected to the fixed thread 101 and the fastening thread 111, respectively. Through the threaded connection between the small-circle thread 42 and the fastening thread 111, and the movement of the threaded sleeve 4, the threaded sleeve 4 generates a pulling force on the fastening thread 111. The fastening thread 111 transmits this pulling force to the inner rod 11, causing the inner rod 11 to move outward from the outer shell 1. This movement of the inner rod 11 drives the push block 113 to move. The push block 113 then presses against the lower surface of the inclined block 52 on its upper surface, transmitting pressure to the fixed frame 51. Supported by the sliding rod 57 and limited by the sliding groove 103, the push block 113 stably moves outward from the outer shell 1. When the rocker arm moves to the side, the fixing block 54 on the flap 53 contacts the inner wall of the borehole, further ensuring the stability of the anchor rod inside the borehole. When the anchor mesh is subjected to a large tension, the outward tension on the anchor rod increases. If the inner rod 11 and the outer shell 1 move outward from the borehole, the fixing block 54 contacts the inner wall of the borehole. The borehole wall then exerts a reaction force on the fixing block 54. With the support of the rotating rod 55, the flap 53 rotates and contacts the inner wall of the borehole, forming a triangular shape. This resists the outward movement force, ensuring that the outer shell 1 and the inner rod 11 can still maintain the stability of the support when the pressure increases.

[0057] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A slope support device for tunnel excavation, comprising a shell (1) and an inner rod (11) slidingly connected with the inner wall of the shell (1), characterized in that, The shell (1) is internally provided with a fixing mechanism (5), one end of the inner rod (11) is provided with a threaded sleeve (4), the end of the inner rod (11) away from the threaded sleeve (4) is provided with an end head (7), a plurality of triangular contact blocks (72) are fixedly installed on one side of the end head (7); The end head (7) is internally provided with a running cavity (71), and the running cavity (71) is internally provided with a stabilizing mechanism (6); The end of the inner rod (11) away from the threaded sleeve (4) is rotatably installed with a fixed disc (13), the side of the fixed disc (13) away from the inner rod (11) is fixedly installed with a damping spring (12), and the end of the damping spring (12) away from the fixed disc (13) is fixedly connected with the inner wall of the running cavity (71); The stabilizing mechanism (6) comprises a rotating disc (61), a plurality of limiting grooves (65) are formed in the circumferential side of the rotating disc (61), and a supporting block (62) is inserted into the limiting groove (65); The opposite sides of the rotating disc (61) are slidably connected with the inner rod (11), the damping spring (12), the fixed disc (13) and the isolating plate (66), and the circumferential side of the isolating plate (66) is fixedly connected with the inner wall of the running cavity (71); the end head (7) is internally fixedly installed with a guide rod (64), and the end of the guide rod (64) away from the inner end of the end head (7) is slidably connected with the inner wall of the guide groove (63).

2. A device for the support of slopes for tunnel excavation according to claim 1, characterized in that, The end of the outer side of the shell (1) is fixedly installed with a taper block (2), the taper block (2) is attached with a tray (3), and the side of the tray (3) away from the taper block (2) is attached with one end of the threaded sleeve (4).

3. A device for the support of slopes for tunnel excavation according to claim 2, characterized in that, The inner side of the shell (1) near the end head (7) is internally provided with a plurality of moving grooves (102), and the inner wall of the moving groove (102) is provided with a sliding groove (103) on the opposite sides.

4. A device for the support of slopes for tunnel excavation according to claim 3, characterized in that, The fixing mechanism (5) comprises a fixed frame (51), a flap groove (56) is formed in the upper side of the fixed frame (51), a flap (53) is arranged in the flap groove (56), and rotating rods (55) are rotatably connected to the opposite sides of the inner wall of the flap groove (56).

5. A device for the support of slopes for tunnel excavation according to claim 4, characterized in that, The inclined block (52) is inclined, and the thickness of one end of the flap (53) is smaller than the thickness of the end of the flap (53) away from the fixed block (54).

6. A device for the support of slopes for tunnel excavation according to claim 5, characterized in that, The opposite sides of the fixed frame (51) are fixedly installed with sliding rods (57), and the end of the sliding rod (57) away from the fixed frame (51) is slidably connected with the inner wall of the sliding groove (103).

7. A device for the support of slopes for tunnel excavation according to claim 6, characterized in that The inner wall of the threaded sleeve (4) is provided with a large circle thread (41), the inner wall of the end of the threaded sleeve (4) is provided with a small circle thread (42), the outer side of the end of the inner rod (11) is provided with a fastening thread (111), the outer side of the end of the shell (1) is provided with a fixing thread (101), the fastening thread (111) is threadedly connected with the small circle thread (42), the fixing thread (101) is threadedly connected with the large circle thread (41), the outer side of the end of the inner rod (11) away from the fastening thread (111) is fixedly provided with a push block (113), the outer side of the inner rod (11) is provided with an inner rod groove (112), and the push block (113) is inclined.

8. A method of construction of a slope support device for tunneling using a slope support device for tunneling according to claim 7, characterized in that: The method comprises the following steps: Step one: end head fixing: the end head (7) stops rotating, the limiting groove (65) extrudes the supporting block (62), the supporting block (62) moves to the outer side of the rotating disc (61), the outer surface of the rotating disc (61) pushes the supporting block (62), one end of the supporting block (62) moves to the outer side of the shell (1), and the end head (7) is fixed; Step two: net hanging and fastening: the tray (3) is sleeved outside the shell (1) and the inner rod (11), and the threaded sleeve (4) is screwed; Step three: shell and inner rod fixing: the large circle thread (41) is threadedly connected with the fixing thread (101), the small circle thread (42) is threadedly connected with the fastening thread (111), the inner rod (11) moves, the push block (113) extrudes the inclined block (52), the inclined block (52) moves to the outer side of the shell (1), and the shell (1) and the inner rod (11) are fixed; Step four: secondary fixing: the fixed block (54) is subjected to a pushing force, the shell (1) and the inner rod (11) move, the fixed block (54) is subjected to a pushing force, the flap (53) rotates, the flap (53) and the fixed frame (51) form a triangle, and the secondary fixing is completed.

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