Rock-socketed steel pipe pile construction guide device

By using a rock-socketed steel pipe pile construction guide device, the problem of inaccurate pile top positioning is solved by utilizing the lateral and longitudinal drive components of the guide device, thus achieving efficient and low-cost steel pipe pile construction and simplifying the operation process.

CN117488803BActive Publication Date: 2026-05-29CRCC HARBOR & CHANNEL ENG BUREAU GRP

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CRCC HARBOR & CHANNEL ENG BUREAU GRP
Filing Date
2023-11-23
Publication Date
2026-05-29

AI Technical Summary

Technical Problem

Existing technologies have poor positioning effects when the design elevation of the pile top is much lower than that of the construction platform and the free end of the steel pipe pile is relatively long, resulting in waste of resources and increased costs. In addition, measuring instruments are required to observe and control the verticality of the steel pipe pile.

Method used

The rock-embedded steel pipe pile construction guidance device includes a base, an external guide cylinder frame, an internal guide arc plate frame, a connecting rod, an extension arc plate frame, a lateral drive component, and a longitudinal drive component. Through the cooperation of the lateral and longitudinal drive components, a guiding function is provided to ensure the accurate positioning of the steel pipe pile.

Benefits of technology

It improves the positioning accuracy when the design elevation of the pile top is much lower than that of the construction platform, reduces resource consumption and costs, simplifies the construction process, and avoids dependence on measuring instruments.

✦ Generated by Eureka AI based on patent content.

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Abstract

The application relates to a rock-embedded steel pipe pile construction guiding device which comprises a base, an external guiding cylinder frame, two internal guiding arc plate frames, two connecting rods, two extension arc plate frames, two transverse driving assemblies and two longitudinal driving assemblies. The transverse driving assemblies are connected to the two sides of the external guiding cylinder frame, the transverse driving assemblies are connected to the internal guiding arc plate frames, the internal guiding arc plate frames are internally provided with mounting cavities, the internal guiding arc plate frames are internally provided with the connecting rods, the bottom ends of the connecting rods are connected to the extension arc plate frames, the internal guiding arc plate frames are connected to the longitudinal driving assemblies, the longitudinal driving assemblies are connected to the connecting rods, and each internal guiding arc plate frame is connected to the external guiding cylinder frame through a connecting assembly. The technical problem that the construction mode in the prior art cannot accurately guarantee the design pile top position, causes resource waste and cost increase, and needs to use measuring instruments is solved.
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Description

Technical Field

[0001] This invention relates to the field of steel pipe pile construction technology, specifically to a rock-embedded steel pipe pile construction guidance device. Background Technology

[0002] Precast beams at wharves are typically installed using floating cranes or on land. Existing methods are suitable for positioning steel pipe piles with short free ends, meaning they are suitable for piles where the distance from the pile cover to the casing opening on the construction platform is short. However, they are less effective for piles with a design elevation significantly lower than the construction platform and long free ends, failing to accurately guarantee the designed pile top position, leading to resource waste and increased costs. Furthermore, these methods require the use of measuring instruments to observe and control the verticality of the steel pipe piles for positioning. Summary of the Invention

[0003] To address the shortcomings of existing technologies, the present invention aims to provide a construction guidance device for rock-embedded steel pipe piles. This device solves the technical problems of existing construction methods, which have poor positioning effects for pile foundations with a design elevation of the pile top that is much lower than the construction platform and a long free end of the steel pipe pile. These methods fail to accurately guarantee the design pile top position, resulting in resource waste, increased costs, and the need for measuring instruments.

[0004] To solve the above-mentioned technical problems, the present invention provides a construction guidance device for rock-embedded steel pipe piles, installed below a construction platform, including a base, an external guide cylinder frame, two internal guide arc plate frames, two connecting rods, two extending arc plate frames, two transverse drive components, and two longitudinal drive components. The base has a first through hole with its axis vertically aligned. The external guide cylinder frame has a second through hole, connected to the base with the first and second through holes coaxially aligned. Both internal guide arc plate frames are located within the second through hole. A transverse drive component is connected to each side of the external guide cylinder frame. Each of the two internal guide arc plate frames is connected to a drive assembly. The two lateral drive assemblies drive the two internal guide arc plate frames to move towards each other in the horizontal direction. Each internal guide arc plate frame has a mounting cavity that extends through the bottom of the internal guide arc plate frame. Each internal guide arc plate frame has a connecting rod that connects to an extension arc plate frame at its bottom end, and the extension arc plate frame is located below the internal guide arc plate frame. Each internal guide arc plate frame is connected to a longitudinal drive assembly that connects to the connecting rod and drives the connecting rod to move vertically. Each internal guide arc plate frame is connected to an external guide cylinder frame through a connecting assembly.

[0005] With the above structure, the rock-embedded steel pipe pile construction guidance device of the present invention has the following advantages: The guidance device is installed below the construction platform. During the construction of the steel pipe pile, two built-in guide arc plate frames are driven to move horizontally by two transverse drive components. The steel pipe pile is lowered from the second through hole and the first through hole, and the two built-in guide arc plate frames provide guidance for the construction of the steel pipe pile. Two longitudinal drive components drive two connecting rods and two extended arc plate frames to move downward. During the downward movement of the steel pipe pile, the extended arc plate frames provide guidance for the construction of the steel pipe pile. This can extend the guidance and positioning of the bottom end of the steel pipe pile, improve the positioning effect of pile foundations where the design elevation of the pile top is much lower than the construction platform and the free end of the steel pipe pile is long, ensure the design pile top position, reduce resource consumption, and reduce costs. Moreover, there is no need to use measuring instruments to observe and control the verticality of the steel pipe pile during the construction process. The overall structure is simple, easy to operate, and highly practical.

[0006] As an improvement, each lateral drive component includes a worm gear, a worm, a rotating shaft, a fixed block, a gear, and a rack. The worm is rotatably connected to the outer wall of the external guide tube frame, and the worm axis is horizontally set. The fixed block is connected to the outer wall of the external guide tube frame, and a rotating shaft is rotatably connected to the fixed block. The axis of the rotating shaft is vertically set. The worm gear and the gear are coaxial with the rotating shaft and rotate synchronously. The worm gear meshes with the worm, and the rack meshes with the gear. The rack passes through the external guide tube frame horizontally and connects to the internal guide arc plate frame. With this structure, the worm gear and the gear are rotated by rotating the worm, and the internal guide arc plate frame is moved by the meshing relationship between the gear and the rack. The structure is simple and easy to operate.

[0007] As an improvement, each lateral drive assembly also includes a connecting fixing plate. Each lateral drive assembly contains two gears and racks. Each gear is coaxially arranged with the rotating shaft and rotates synchronously. One end of each rack passes through the external guide tube frame and is connected to the internal guide arc plate frame. Each gear meshes with one rack, and the other ends of the two racks are connected by the connecting fixing plate. This structure makes the connection and drive between the lateral drive assembly and the internal guide arc plate frame more stable.

[0008] As an improvement, each connecting component includes two sliders and two connecting rods. The two sliders are vertically slidably connected to the inner wall of the outer guide tube frame. One end of each connecting rod is hinged to the inner guide arc plate frame, and the other end of each connecting rod is hinged to one of the sliders. The sliders and connecting rods correspond one-to-one. This structure makes the connection between the inner guide arc plate frame and the outer guide tube frame more stable.

[0009] As an improvement, each connecting component also includes two first bolts. The inner wall of the outer guide tube frame has two vertically oriented sliding grooves, and the outer wall of the outer guide tube frame has two vertically oriented elongated holes. The first bolts, sliding grooves, sliders, and elongated holes correspond one-to-one. The slider is slidably connected in the sliding groove. The sliding groove and the elongated hole are arranged adjacent to each other on the left and right. The elongated hole penetrates the outer guide tube frame into the inner side and communicates with the sliding groove. The first bolt passes through the elongated hole and is threadedly connected to the slider. This structure allows the slider to slide stably on the inner wall of the built-in guide arc plate frame, and the structure is simple and easy to connect.

[0010] As an improvement, one of the built-in guide arc plate frames is connected to the external guide cylinder frame by a telescopic rod, with the telescopic rod extending and retracting in the horizontal direction; this structure improves the stability of the horizontal movement of the built-in guide arc plate frame.

[0011] As an improvement, the longitudinal drive assembly includes a reciprocating lead screw and a lead screw nut. The reciprocating lead screw is rotatably connected to the built-in guide arc plate frame. The reciprocating lead screw is located in the mounting cavity and its upper end protrudes above the built-in guide arc plate frame. The lead screw nut is slidably connected in the mounting cavity and threadedly connected to the reciprocating lead screw. A connecting rod is connected to the lead screw nut. With this structure, rotating the reciprocating lead screw drives the lead screw nut and the connecting rod to move vertically, which has the advantages of simple structure and convenient operation.

[0012] As an improvement, both the built-in guide arc plate frame and the extended arc plate frame are arc-shaped, and the concave surface of each built-in guide arc plate frame and the concave surface of each extended arc plate frame face the other built-in guide arc plate frame and the other extended arc plate frame, respectively. This structure makes the built-in guide arc plate frame and the extended arc plate frame more compatible with the shape of the steel pipe pile, providing a more stable and accurate guiding effect.

[0013] As an improvement, two support frames are connected to the base, which are respectively connected to both sides of the external guide tube frame. The two support frames cover the two transverse drive components. This structure improves the overall stability of the guiding device. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0015] Figure 2 This is a schematic diagram of the structure of the built-in guide arc plate frame and the external guide cylinder frame on one side of the present invention.

[0016] Figure 3 for Figure 2 A magnified view of part A in the middle.

[0017] Reference numerals: 1. Base; 2. External guide tube frame; 3. Internal guide arc plate frame; 4. Connecting rod; 5. Extending arc plate frame; 6. Lateral drive assembly; 61. Worm gear; 62. Worm; 63. Rotating shaft; 64. Fixing block; 65. Gear; 66. Rack; 67. Connecting fixing plate; 7. Longitudinal drive assembly; 71. Reciprocating lead screw; 72. Lead screw nut; 8. First through hole; 9. Second through hole; 10. Mounting cavity; 11. Connecting assembly; 111. Slider; 112. Connecting rod; 113. First bolt; 12. Slide groove; 13. Elongated hole; 14. Telescopic rod; 15. Support frame; 16. Construction platform. Detailed Implementation

[0018] The rock-embedded steel pipe pile construction guidance device of the present invention will be described in detail below with reference to the accompanying drawings.

[0019] like Figures 1 to 3 As shown, a rock-embedded steel pipe pile construction guide device is installed below a construction platform 16. It includes a base 1, an external guide tube frame 2, two internal guide arc plate frames 3, two connecting rods 4, two extending arc plate frames 5, two transverse drive components 6, and two longitudinal drive components 7. The base 1 has a first through hole 8, with its axis vertically aligned. The external guide tube frame 2 has a second through hole 9, connected to the base 1, with the first through hole 8 and the second through hole 9 coaxially aligned. The external guide tube frame 2 has a cylindrical structure. The two internal guide arc plate frames 3 are both located within the second through hole 9, and are of the same height and distributed horizontally. A transverse drive component 6 is connected to each side of the external guide tube frame 2, with one part of the transverse drive component 6 located on the outside of the external guide tube frame 2 and the other part located on the inside of the external guide tube frame 2 and connected to the internal guide arc plate frames 3. Each transverse drive component 6 is connected to one internal guide arc plate. The frame 3 drives the built-in guide arc plate frame 3 to move horizontally. Each built-in guide arc plate frame 3 is set vertically, and during construction, the two built-in guide arc plate frames 3 are in contact with the outer wall of the steel pipe pile to provide guidance. Each built-in guide arc plate frame 3 is provided with an installation cavity 10, which is set along the length of the built-in guide arc plate frame 3, that is, along the vertical direction. The installation cavity 10 passes through the bottom end of the built-in guide arc plate frame 3. Each built-in guide arc plate frame 3 is provided with a connecting rod 4. The bottom end of the connecting rod 4 extends below the built-in guide arc plate frame 3, and the bottom end of the connecting rod 4 is connected to an extension arc plate frame 5, which is located below the built-in guide arc plate frame 3. Each built-in guide arc plate frame 3 is connected with a longitudinal drive component 7. The longitudinal drive component 7 is connected to the connecting rod 4 and drives the connecting rod 4 to move vertically. During construction, the longitudinal drive component 7 drives the connecting rod 4 to move downward, thereby driving the extension arc plate frame 5 to move downward, providing guidance for the bottom end of the steel pipe pile.

[0020] like Figure 1As shown, two support frames 15 are connected to the base 1. The two support frames 15 are respectively connected to both sides of the external guide tube frame 2. The two support frames 15 cover the two transverse drive components 6. Specifically, each support frame 15 includes a horizontal part and a vertical part. One end of the horizontal part is connected to the outer wall of the external guide tube frame 2, and the other end of the horizontal part is connected to the upper end of the vertical part. The lower end of the vertical part is connected to the base 1 by bolts. The part of the transverse drive component 6 exposed outside the external guide tube frame 2 is located below the horizontal part. In some other embodiments, only one support frame 15 is provided, and a third through hole is opened in the horizontal part of the support frame 15. The inner wall of the third through hole is connected to the outer wall of the external guide tube frame 2. In this embodiment, the built-in guide arc plate frame 3 and the extended arc plate frame 5 are both arc-shaped, and the concave surface of each built-in guide arc plate frame 3 and the concave surface of each extended arc plate frame 5 face the other built-in guide arc plate frame 3 and the other extended arc plate frame 5, respectively.

[0021] like Figure 2 and Figure 3 As shown, each transverse drive assembly 6 includes a worm gear 61, a worm 62, a rotating shaft 63, a fixed block 64, a gear 65, and a rack 66. The worm 62 is rotatably connected to the outer wall of the outer guide tube frame 2, and the axis of the worm 62 is horizontally set. The entire worm 62 is located on the outside of the outer guide tube frame 2, and one end of the worm 62 is rotatably connected to the outer guide tube frame 2, while the other end is connected to a rotating handle. The fixed block 64 is connected to the outer wall of the outer guide tube frame 2, and the rotating shaft 63 is rotatably connected to the fixed block 64. The axis of the rotating shaft 63 is set vertically, and the worm gear 61 and the gear 65 are coaxially and synchronously set with the rotating shaft 63. Rotation occurs when the worm gear 61 meshes with the worm 62, and the rack 66 meshes with the gear 65. The rack 66 passes horizontally through the external guide tube frame 2 and connects to the internal guide arc plate frame 3. Furthermore, each transverse drive assembly 6 includes a connecting fixing plate 67. Each transverse drive assembly 6 contains two gears 65 and two racks 66. Each gear 65 is coaxially arranged with the rotating shaft 63 and rotates synchronously. One end of each rack 66 passes through the external guide tube frame 2 and connects to the internal guide arc plate frame 3. Each gear 65 meshes with one rack 66, and the other ends of the two racks 66 are connected via the connecting fixing plate 67. Figure 3 As shown, the transverse drive assembly 6 in this embodiment has two fixed blocks 64, the rotating shaft 63 is rotatably connected to the two fixed blocks 64, and the two gears 65 are connected to the two ends of the rotating shaft 63, while the worm gear 61 is connected to the middle of the rotating shaft 63.

[0022] like Figure 2As shown, each built-in guide arc plate frame 3 is connected to the external guide cylinder frame 2 via a connecting assembly 11. Each connecting assembly 11 includes two sliders 111 and two connecting rods 112. The two sliders 111 are vertically slidably connected to the inner wall of the external guide cylinder frame 2, and the two sliders 111 are distributed vertically. One end of each connecting rod 112 is hinged to the built-in guide arc plate frame 3, and the other end of each connecting rod 112 is hinged to one of the sliders 111. The sliders 111 and connecting rods 112 correspond one-to-one. In this embodiment, the connecting rod 112 located above is obliquely downward from the slider 111 towards the built-in guide arc plate frame 3, while the connecting rod 112 located below is obliquely upward from the slider 111 towards the built-in guide arc plate frame 3. Figure 2 As shown, each connecting component 11 also includes two first bolts 113. The inner wall of the outer guide tube frame 2 is provided with two vertically arranged sliding grooves 12, and the outer wall of the outer guide tube frame 2 is provided with two vertically arranged elongated holes 13. The first bolts 113, sliding grooves 12, sliders 111 and elongated holes 13 correspond one-to-one. The sliders 111 are slidably connected in the sliding grooves 12. The sliding grooves 12 and elongated holes 13 are arranged adjacent to each other on the left and right. The elongated holes 13 penetrate the outer guide tube frame 2 into the inner side and communicate with the sliding grooves 12. The first bolts 113 pass through the elongated holes 13 and are threadedly connected to the sliders 111. The head of the first bolts 113 is located on the outer side of the outer guide tube frame 2.

[0023] like Figure 1 As shown, one of the built-in guide arc plate frames 3 and the external guide cylinder frame 2 are connected by a telescopic rod 14, and the telescopic rod 14 is set in the horizontal direction. In this embodiment, the upper and lower ends of the left side wall of the built-in guide arc plate frame 3 on the left are connected to the external guide cylinder frame 2 by the telescopic rod 14.

[0024] like Figure 2 As shown, the longitudinal drive assembly 7 includes a reciprocating lead screw 71 and a lead screw nut 72. The reciprocating lead screw 71 is rotatably connected to the built-in guide arc plate frame 3. The reciprocating lead screw 71 is located inside the mounting cavity 10, and its upper end protrudes above the built-in guide arc plate frame 3. Specifically, the reciprocating lead screw 71 is rotatably connected to the top end of the built-in guide arc plate frame 3, and a rotating handle is connected to the upper end of the reciprocating lead screw 71. The lead screw nut 72 is slidably connected inside the mounting cavity 10 and threadedly connected to the reciprocating lead screw 71. In this embodiment, the mounting cavity 10 has a square cross-section, and the lead screw nut 72 also has a square cross-section. Each outer wall of the lead screw nut 72 slides against each inner wall of the mounting cavity 10. The connecting rod 4 connects to the lead screw nut 72. In this embodiment, the top end face of the connecting rod 4 is connected to the lead screw nut 72, and the top end face of the connecting rod 4 is provided with a downwardly extending clearance hole, and the reciprocating lead screw 71 is located inside the clearance hole.

[0025] The guiding device is installed below the construction platform 16. During the construction of the steel pipe pile, two horizontal drive components 6 drive two built-in guide arc plate frames 3 to move horizontally. The steel pipe pile is lowered from the second through hole 9 and the first through hole 8, and the two built-in guide arc plate frames 3 provide guidance for the construction of the steel pipe pile. Two longitudinal drive components 7 drive two connecting rods 4 and two extended arc plate frames 5 to move downward. During the downward movement of the steel pipe pile, the extended arc plate frames 5 provide guidance for the construction of the steel pipe pile. This can extend the guidance and positioning of the bottom end of the steel pipe pile, improve the positioning effect of pile foundations where the design elevation of the pile top is much lower than the construction platform 16 and the free end of the steel pipe pile is relatively long, ensure the design pile top position, reduce resource consumption, and reduce costs. Moreover, there is no need to use measuring instruments to observe and control the verticality of the steel pipe pile during the construction process. The overall structure is simple, easy to operate, and highly practical.

[0026] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above-described embodiment. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

Claims

1. A construction guidance device for rock-embedded steel pipe piles, characterized in that, Installed below the construction platform (16), the assembly includes a base (1), an external guide tube frame (2), two internal guide arc plate frames (3), two connecting rods (4), two extension arc plate frames (5), two transverse drive components (6), and two longitudinal drive components (7). The base (1) has a first through hole (8) with its axis set vertically. The external guide tube frame (2) has a second through hole (9). The external guide tube frame (2) is connected to the base (1), and the first through hole (8) and the second through hole (9) are coaxially arranged. The two internal guide arc plate frames (3) are located inside the second through hole (9). A transverse drive component (6) is connected to each side of the external guide tube frame (2), and each transverse drive component (6) is connected to one of the internal guide arc plate frames (3). Two of the horizontal drive components (6) drive two of the built-in guide arc plate frames (3) to move towards each other in the horizontal direction. Each of the built-in guide arc plate frames (3) is provided with an installation cavity (10). The installation cavity (10) passes through the bottom end of the built-in guide arc plate frame (3). Each of the built-in guide arc plate frames (3) is provided with a connecting rod (4). The bottom end of the connecting rod (4) is connected to the extension arc plate frame (5), and the extension arc plate frame (5) is located below the built-in guide arc plate frame (3). Each of the built-in guide arc plate frames (3) is connected with a longitudinal drive component (7). The longitudinal drive component (7) is connected to the connecting rod (4) and drives the connecting rod (4) to move vertically. Each of the built-in guide arc plate frames (3) is connected to the external guide cylinder frame (2) through a connecting component (11). Each of the connecting components (11) includes two sliders (111) and two connecting rods (112). The two sliders (111) are slidably connected to the inner wall of the external guide tube frame (2) in a vertical direction. One end of each connecting rod (112) is hinged to the built-in guide arc plate frame (3), and the other end of each connecting rod (112) is hinged to one of the sliders (111). The sliders (111) and the connecting rods (112) correspond one-to-one. Each of the connecting components (11) further includes two first bolts (113). The inner wall of the external guide tube frame (2) is provided with two vertically arranged sliding grooves (12). The outer wall of the external guide tube frame (2) is provided with two vertically arranged elongated holes (13). The first bolts (113), the sliding grooves (12), the sliders (111) and the elongated holes (13) correspond one-to-one. The sliders (111) are slidably connected in the sliding grooves (12). The sliding grooves (12) and the elongated holes (13) are arranged adjacent to each other on the left and right. The elongated holes (13) penetrate the external guide tube frame (2) to the inside and communicate with the sliding grooves (12). The first bolts (113) pass through the elongated holes (13) and are threadedly connected to the sliders (111). One of the built-in guide arc plate frames (3) is connected to the external guide cylinder frame (2) by a telescopic rod (14), and the telescopic rod (14) is set in the horizontal direction.

2. The rock-embedded steel pipe pile construction guiding device according to claim 1, characterized in that, Each of the lateral drive components (6) includes a worm gear (61), a worm (62), a rotating shaft (63), a fixed block (64), a gear (65), and a rack (66). The worm (62) is rotatably connected to the outer wall of the external guide tube frame (2), and the axis of the worm (62) is set horizontally. The fixed block (64) is connected to the outer wall of the external guide tube frame (2), and the rotating shaft (63) is rotatably connected to the fixed block (64). The axis of the rotating shaft (63) is set vertically. The worm gear (61) and the gear (65) are both coaxially set with the rotating shaft (63) and rotate synchronously. The worm gear (61) meshes with the worm (62), and the rack (66) meshes with the gear (65). The rack (66) passes through the external guide tube frame (2) in the horizontal direction and is connected to the internal guide arc plate frame (3).

3. The rock-embedded steel pipe pile construction guiding device according to claim 2, characterized in that, Each of the lateral drive components (6) further includes a connecting fixing plate (67). Each of the lateral drive components (6) has two gears (65) and two racks (66). Each gear (65) is coaxially arranged with the rotating shaft (63) and rotates synchronously. One end of each rack (66) passes through the external guide tube frame (2) and is connected to the internal guide arc plate frame (3). Each gear (65) meshes with one rack (66). The other ends of the two racks (66) are connected through the connecting fixing plate (67).

4. The rock-embedded steel pipe pile construction guiding device according to claim 1, characterized in that, The longitudinal drive assembly (7) includes a reciprocating lead screw (71) and a lead screw nut (72). The reciprocating lead screw (71) is rotatably connected to the built-in guide arc plate frame (3). The reciprocating lead screw (71) is located in the mounting cavity (10) and the upper end of the reciprocating lead screw (71) protrudes above the built-in guide arc plate frame (3). The lead screw nut (72) is slidably connected in the mounting cavity (10) and threadedly connected to the reciprocating lead screw (71). The connecting rod (4) is connected to the lead screw nut (72).

5. The rock-embedded steel pipe pile construction guiding device according to claim 1, characterized in that, Both the built-in guide arc plate frame (3) and the extended arc plate frame (5) are arc-shaped, and the concave surface of each built-in guide arc plate frame (3) and the concave surface of each extended arc plate frame (5) face the other built-in guide arc plate frame (3) and the other extended arc plate frame (5), respectively.

6. The rock-embedded steel pipe pile construction guiding device according to claim 1, characterized in that, Two support frames (15) are connected to the base (1). The two support frames (15) are respectively connected to both sides of the external guide tube frame (2). The two support frames (15) cover the two transverse drive components (6).