Automatic supporting device for super-large section highway tunnel construction

Abstract

The invention relates to the technical field of tunnel engineering, in particular to an automatic supporting device for super-large section highway tunnel construction, which comprises a controller and a cross frame, and a supporting assembly which is used for supporting a tunnel section and can be overlapped and contracted is arranged at the top of the cross frame; the supporting assembly comprises a fixing plate fixedly connected to the top of the transverse frame, and a plurality of rotating plates are rotationally matched with the fixing plate and located on the two sides of the fixing plate correspondingly. A vertical groove is formed in the fixed plate, a first telescopic piece is fixedly connected in the vertical groove, a sliding rod is vertically and slidably matched in the vertical groove, an output shaft of the first telescopic piece is fixedly connected with the sliding rod, a plurality of hinge rods are hinged to the sliding rod, and the ends, away from the sliding rod, of the hinge rods are hinged to the rotating plates adjacent to the hinge rods; arc-shaped supporting frames are fixedly connected to the tops of the fixed plate and the rotating plate; and through the design of a sliding rod and a rotating plate, opening and closing of the supporting frame can be controlled, the overall size of the device is reduced, the device is convenient to move, and then the tunnel construction efficiency is effectively improved.

Description

Technical Field

[0001] This invention relates to the field of tunnel engineering technology, specifically to an automatic support device for the construction of ultra-large cross-section highway tunnels. Background Technology

[0002] Large-section highway tunnels (typically referring to excavation spans ≥18m or cross-sectional areas ≥140㎡) present significantly increased construction difficulty and risks due to their large span and complex surrounding rock stress. During construction, it is necessary to excavate the construction section and then provide temporary supports to facilitate subsequent work; the supports must be timely and stable to ensure the safety and feasibility of the construction.

[0003] In existing technologies, support devices are typically used, such as the large-section tunnel support device developed by Chongqing Vocational College of Engineering. This device mainly includes a support steel frame and main load-bearing rods. The support steel frame is fitted to the tunnel cross-section, and the main load-bearing rods support both the support steel frame and the tunnel cross-section, thereby improving the stability of the tunnel cross-section and providing a stable construction environment for subsequent construction.

[0004] During tunnel construction, the support system needs to be moved continuously as the tunnel is built. However, existing support systems, due to their fixed steel frame structure, have a large overall size and cannot be stacked and stored, hindering overall movement and affecting construction efficiency. Therefore, it is necessary to propose an automatic support device for ultra-large cross-section highway tunnel construction that can stack and store the steel frame, reducing the overall size of the device and facilitating its movement. Summary of the Invention

[0005] To address the aforementioned problems, this invention provides an automatic support device for the construction of ultra-large cross-section highway tunnels. Through the design of a sliding rod and a rotating plate, when support for the tunnel cross-section is required, the sliding rod drives the rotating plate to rotate, thereby unfolding the support frame and enabling the device to support the tunnel cross-section. When the device needs to be moved, the rotation of the rotating plate allows the support frame to overlap, reducing the overall volume of the device and facilitating its movement, thus effectively improving the construction efficiency of the tunnel.

[0006] To achieve the above objectives, the technical solution of the present invention is as follows: an automatic support device for the construction of ultra-large cross-section highway tunnels, including a controller and a cross frame, wherein the top of the cross frame is provided with a support component for supporting the tunnel cross-section and capable of overlapping and shrinking.

[0007] The support assembly includes a fixed plate fixedly connected to the top of the crossbeam, with several rotating plates rotatably fitted on the fixed plate, each located on one side of the fixed plate; a vertical groove is formed on the fixed plate, with a first telescopic member fixedly connected in the vertical groove, and a sliding rod slidably fitted in the vertical groove; the output shaft of the first telescopic member is fixedly connected to the sliding rod, and several hinge rods are hinged to the sliding rod, with the ends of the hinge rods away from the sliding rods all hinged to the adjacent rotating plates; an arc-shaped support frame is fixedly connected to the top of both the fixed plate and the rotating plates.

[0008] The fixed plate is also equipped with a spraying component for spraying auxiliary liquid to improve the stability of the tunnel cross section, and the cross frame is also equipped with an extension component for expanding the overall support range of the device; the controller is used to control the operation of the first telescopic component, thereby driving the slide bar to slide vertically in the vertical groove, and simultaneously driving the spraying component and the extension component to operate.

[0009] The technical principles of the above solution are as follows: The controller activates the first telescopic component, which drives the slide rod to slide vertically along the vertical groove. Since the two ends of the hinge rod are hinged to the slide rod and the rotating plate respectively, when the slide rod slides vertically, it will drive the hinge rod to rotate, which in turn will drive the rotating plate to rotate. The rotating plate will move away from or closer to the fixed plate, thereby causing the support frame to unfold or overlap. At the same time as the support frame unfolds, the spraying component will spray auxiliary liquid on the tunnel section, and the expansion component will expand the support range of the device.

[0010] The above approach has the following beneficial effects: 1. Existing support devices use an arc-shaped support steel frame that fits against the tunnel cross-section to support it. However, because the support steel frame structure is fixed and cannot be overlapped, existing support devices are bulky and difficult to move. This invention uses a sliding rod and a rotating plate design. When support for the tunnel cross-section is needed, the sliding rod moves, causing the rotating plate to rotate, thus unfolding the support frame and enabling the device to support the tunnel cross-section. When the device needs to be moved, the rotation of the rotating plate allows the support frame to overlap, reducing the overall size of the device, facilitating movement, and effectively improving tunnel construction efficiency.

[0011] 2. Different tunnels have different arc lengths at the top. In existing technologies, support steel frames of the same length as the arc length at the top of the tunnel are prefabricated to support the tunnel cross-section. This method is costly and cannot quickly adjust the size of the support steel frames according to the arc length at the top of the tunnel. This invention, through the overlapping design of the support frames, can freely adjust the position of the support frames, thereby adjusting the overall size of the device and forming support structures with different arc lengths. This allows for rapid adaptation to tunnels of different sizes, improves the convenience of operation, and further improves construction efficiency.

[0012] 3. In this invention, during the deployment of the support frame, the support frame will clean the tunnel cross section, thereby scraping off the loose rock and soil in advance, preventing the loose rock and soil from falling off during construction, preventing safety accidents, and thus improving the stability of the rock strata and the safety of construction.

[0013] Furthermore, the spraying assembly includes a piston box fixedly connected to the side wall of the fixed plate, a piston rod fixedly connected to the top of the slide rod, the piston rod extending into the piston box and fixedly connected to a piston plate, the piston plate slidingly engaging with the inner side wall of the piston box; the piston box stores auxiliary liquid; several spray holes are opened on the top of the support frame, and the spray holes are all connected to the piston box, with a control valve connected at the connection point; a vent is opened on the top of the piston box.

[0014] Beneficial effects: By utilizing the extension and retraction of the first telescopic component, the piston plate slides vertically within the piston box, thereby spraying the auxiliary fluid onto the tunnel cross-section, effectively improving the stability of the rock strata. At the same time, no additional drive components are required, effectively reducing the manufacturing cost of the device.

[0015] Furthermore, the auxiliary liquid includes one or more of soil stabilizers, modified cement grouts, or silicate sealants.

[0016] Beneficial effects: Soil stabilizers can rapidly harden the soil, modified cement grout can reinforce the soil layer, and silicate sealants can fill the pores in the soil layer; the use of auxiliary liquids can further improve the stability of the tunnel cross section.

[0017] Furthermore, the expansion component includes symmetrical transverse slots opened on the top of the cross frame, with crossbars slidingly fitted in each transverse slot. A connecting rod is hinged to one end of each crossbar, and an arc-shaped support plate is fixedly connected to the other end of each crossbar. The end of the connecting rod away from the crossbar is hinged to the adjacent rotating plate.

[0018] Beneficial effects: The support plate moves to both sides as the support frame unfolds, thereby supporting the sidewalls of the tunnel section, while the support frame supports the top of the tunnel section; the support plate and the support frame support the tunnel section simultaneously, forming an arc-shaped support structure, which improves the comprehensiveness of the support.

[0019] Furthermore, symmetrical support seats are provided at the bottom of the cross frame, and a second telescopic component is fixedly connected to the top of each support seat. The output shaft of the second telescopic component is fixedly connected to the bottom of the cross frame. The controller is used to control the operation of the second telescopic component.

[0020] Beneficial effects: Through the design of the second telescopic component, operators can adjust the overall height of the device according to the construction height of the tunnel, thereby ensuring that the support frame can be stably fitted with the tunnel cross section and ensuring the support effect.

[0021] Furthermore, each support base is fixedly connected to an electronically controlled wheel hub, and the controller is used to control the operation of the electronically controlled wheel hub.

[0022] Beneficial effects: The design of the electrically controlled hub allows operators to adjust the overall position of the device according to the progress of tunnel construction.

[0023] Furthermore, load-bearing blocks are symmetrically and fixedly connected to the top of the cross frame, and each load-bearing block is fixedly connected to an elastic layer.

[0024] Beneficial effects: The load-bearing block can support the rotating plate and share the pressure on the hinge rod. At the same time, the elastic layer can deform with the compression of the rotating plate, avoiding hard compression of the rotating plate, thereby improving the service life of the device.

[0025] Furthermore, the rotating plates are all equipped with perforated grooves.

[0026] Beneficial effects: The hollowed-out groove can reduce the weight of the rotating plate, thereby reducing the pressure on the hinge rod, load-bearing block and cross frame, and also reducing the burden when the device moves as a whole, thus improving the overall service life of the device.

[0027] Furthermore, triangular blocks are fixedly connected to both sides of the crossbar, and the crossbars slide in conjunction with the adjacent triangular blocks.

[0028] Beneficial effects: The triangular block design can extend the support surface of the crossbar and improve the stability of the crossbar sliding.

[0029] Furthermore, each crossbar has several limiting holes, and each triangular block has a threaded hole. Each threaded hole has a limiting bolt at the top, and the limiting bolt passes through the limiting hole and is threadedly connected to the adjacent triangular block.

[0030] Beneficial effects: The limiting bolts can limit the crossbar, thereby keeping the connecting rod, hinge rod and rotating plate fixed, thus ensuring the stability of the support.

[0031] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0032] Figure 1 This is a front view of the automatic support device for ultra-large cross-section highway tunnel construction of the present invention in its initial state.

[0033] Figure 2 This is a front view of the automatic support device for ultra-large cross-section highway tunnel construction of the present invention in its deployed state.

[0034] Figure 3 This is a front sectional view of the automatic support device for ultra-large cross-section highway tunnel construction of the present invention.

[0035] Figure 4 This is an isometric view of the support components in the automatic support device for ultra-large cross-section highway tunnel construction of the present invention.

[0036] The reference numerals in the accompanying drawings of the instruction manual include: 1. Crossbar; 2. Fixed plate; 3. Rotating plate; 4. First telescopic component; 5. Slide rod; 6. Hinge rod; 7. Support frame; 8. Piston box; 9. Piston rod; 10. Piston plate; 11. Spray hole; 12. Control valve; 13. Vent hole; 14. Crossbar; 15. Connecting rod; 16. Support plate; 17. Support base; 18. Second telescopic component; 19. Electrically controlled hub; 20. Load-bearing block; 21. Triangular block; 22. Limit bolt. Detailed Implementation

[0037] The following detailed description illustrates the specific implementation method: Implementation, for example Figure 1 As shown, an automatic support device for the construction of ultra-large cross-section highway tunnels includes a controller and a crossbeam 1. The top of the crossbeam 1 is provided with a support component for supporting the tunnel cross-section and which can overlap and retract.

[0038] like Figure 1 and Figure 4 As shown, the support assembly includes a fixed plate 2 bolted to the top of the cross frame 1, and several rotating plates 3 rotatably fitted on the fixed plate 2, with the rotating plates 3 located on both sides of the fixed plate 2. The fixed plate 2 has a vertical groove, and a first telescopic member 4 (in this embodiment, the first telescopic member 4 is a hydraulic cylinder) is bolted to the vertical groove. A sliding rod 5 is vertically slidably fitted in the vertical groove. The output shaft of the first telescopic member 4 is bolted to the sliding rod 5. Several hinge rods 6 are hinged to the sliding rod 5, and the ends of the hinge rods 6 away from the sliding rod 5 are all hinged to the adjacent rotating plates 3. An arc-shaped support frame 7 is bolted to the top of both the fixed plate 2 and the rotating plates 3 (in this embodiment, the support frame 7 is made of Q460 high-strength steel with a single-point load capacity of >8.5 tons).

[0039] The fixed plate 2 is also equipped with a spraying component for spraying auxiliary liquid to improve the stability of the tunnel cross section, and the cross frame 1 is also equipped with an extension component for expanding the overall support range of the device; the controller is used to control the operation of the first telescopic component 4, thereby driving the slide bar 5 to slide vertically in the vertical groove, and at the same time driving the spraying component and the extension component to operate.

[0040] Specifically, such as Figure 1As shown, in the initial state, the first telescopic member 4 is in an extended state. The operator activates the first telescopic member 4 to retract via the controller. The first telescopic member 4 will drive the slide rod 5 to slide downward along the vertical groove. Since the two ends of the hinge rod 6 are hinged to the slide rod 5 and the rotating plate 3 respectively, when the slide rod 5 slides downward, it will drive the hinge rod 6 to rotate. The ends of the hinge rod 6 that are close to each other will move downward, and the ends that are far apart will move outward, thereby driving the rotating plate 3 to rotate outward (in this embodiment, the rotating plate 3 is made of 42CrMo alloy steel, and after 100,000 opening and closing tests, the wear of the hinge part is <0.1mm). The rotating plate 3 will move away from the fixed plate 2, thereby causing the support frame 7 to unfold (e.g. Figure 2 As shown, at this time, the support frame 7 forms an arc structure of approximately 210°.

[0041] like Figure 3 As shown, the spraying assembly includes a piston box 8 bolted to the side wall of the fixing plate 2, a piston rod 9 bolted to the top of the slide rod 5, the piston rod 9 extending into the piston box 8 and bolted to a piston plate 10, the piston plate 10 slidingly engaging with the inner side wall of the piston box 8; the piston box 8 stores an auxiliary liquid (the auxiliary liquid includes one or more of soil stabilizer, modified cement slurry, or silicate sealant, in this embodiment, soil stabilizer is used); the top of the support frame 7 has several spray holes 11, all of which communicate with the piston box 8, and a control valve 12 is connected at the connection point; the top of the piston box 8 has a vent hole 13.

[0042] Specifically, when the output shaft of the first telescopic component 4 drives the slide bar 5 to move downward, the support frame 7 will unfold and support the tunnel section. During this process, the control valve 12 is kept open by the controller. When the slide bar 5 moves downward, it will pull the piston rod 9 and the piston plate 10 to slide downward in the piston box 8, thereby spraying the soil stabilizer in the piston box 8 to the tunnel section through the control valve 12 and the spray hole 11, thereby improving the stability of the rock strata.

[0043] like Figure 3 As shown, the expansion assembly includes symmetrical transverse slots on the top of the crossbar 1. A crossbar 14 is slidably fitted in each transverse slot. A connecting rod 15 is hinged to one end of each crossbar 14, and an arc-shaped support plate 16 is bolted to the other end of each crossbar 14. The end of the connecting rod 15 away from the crossbar 14 is hinged to the adjacent rotating plate 3.

[0044] Specifically, when the sliding rod 5 moves downward, the rotating plate 3 will rotate outward of the cross frame 1, thereby pushing the connecting rod 15 to rotate and move outward of the cross frame 1. The connecting rod 15 will push the cross rod 14 and the support plate 16 to move outward of the cross frame 1, and then gradually approach the tunnel cross-section sidewall to support the tunnel cross-section sidewall. The support plate 16 and the support frame 7 simultaneously support the tunnel cross-section, forming an arc-shaped support structure, which improves the comprehensiveness of the support.

[0045] like Figure 1 As shown, the bottom of the cross frame 1 is symmetrically provided with support seats 17, and the top of each support seat 17 is bolted to a second telescopic component 18 (in this embodiment, the second telescopic component 18 is a hydraulic cylinder). The output shaft of the second telescopic component 18 is bolted to the bottom of the cross frame 1. The controller is used to control the operation of the second telescopic component 18. The operator can control the extension and retraction of the second telescopic component 18 according to the tunnel construction height, thereby adjusting the overall height of the device, ensuring that the support frame 7 can stably fit with the tunnel cross section and ensure the support effect.

[0046] Each support base 17 has an electrically controlled wheel hub 19 bolted to its bottom. The controller is used to control the operation of the electrically controlled wheel hub 19. The operator can control the operation of the electrically controlled wheel hub 19 through the controller according to the tunnel construction progress, thereby moving the entire device and adjusting its overall position.

[0047] like Figure 1 and Figure 2 As shown, load-bearing blocks 20 are symmetrically bolted to the top of the crossbar 1. Each load-bearing block 20 has an elastic layer fixedly bonded to its top (in this embodiment, the elastic layer is made of rubber). When the rotating plate 3 rotates to both sides and comes into contact with the load-bearing blocks 20, the load-bearing blocks 20 can support the rotating plate 3 and share the pressure on the hinge rod 6. At the same time, the elastic layer can deform with the compression of the rotating plate 3, avoiding hard compression of the rotating plate 3, thereby improving the service life of the device.

[0048] like Figure 2 As shown, each rotating plate 3 has a hollowed-out groove (accounting for about 27% of the volume of the rotating plate 3); the hollowed-out groove can reduce the weight of the rotating plate 3 (each rotating plate 3 is reduced by about 27%), thereby reducing the pressure on the hinge rod 6, the load-bearing block 20 and the cross frame 1, and also reducing the burden when the device moves as a whole, thus improving the overall service life of the device.

[0049] like Figure 3 As shown, triangular blocks 21 are bolted to both sides of the crossbar 1, and each crossbar 14 slides with the adjacent triangular block 21. The design of the triangular block 21 extends the support surface of the crossbar 1 and improves the stability of the sliding of the crossbar 14.

[0050] Each crossbar 14 has several limiting holes, and each triangular block 21 has a threaded hole. Each threaded hole has a limiting bolt 22 at its top, which passes through the limiting hole and is threadedly connected to the adjacent triangular block 21. When the support frame 7 rotates to the designated position, the corresponding limiting hole on the crossbar 14 aligns with the threaded hole. The operator can then thread the limiting bolt 22 through this hole to the triangular block 21, thereby fixing the crossbar 14, which in turn fixes the connecting rod 15, the hinge rod 6, and the rotating plate 3, thus fixing the support frame 7 and the support plate 16 and ensuring the stability of the support.

[0051] The specific implementation process is as follows: like Figure 1 As shown, in the initial state, the output shaft of the first telescopic component 4 is extended, the output shaft of the second telescopic component 18 is retracted, the rotating plates 3 are close to the fixed plate 2, and the crossbars 14 are located in the transverse grooves. At this time, the support frame 7 forms an arc structure of approximately 100° (the device volume is reduced by approximately 50% compared to the fully extended state of the support frame 7); the control valve 12 is in the open state. At this time, the operator activates the electrically controlled hub 19 through the controller, so that the entire device moves with minimal volume, reducing the obstruction encountered when the device moves (the windward area of ​​the device is reduced by approximately 50%, and the wind resistance is reduced by approximately 67%).

[0052] After the device is moved to the designated position (the current tunnel section), the operator activates the second telescopic component 18 through the controller, which causes the cross frame 1 to drive the fixed plate 2, rotating plate 3 and support frame 7 to rise until the top of the support frame 7 is in contact with the top of the tunnel section.

[0053] After the top of the support frame 7 is in contact with the top of the tunnel section, the operator uses the controller to retract the output shaft of the first telescopic component 4. At this time, the output shaft of the first telescopic component 4 will drive the slide rod 5 to slide in the vertical groove, thereby driving the hinge rod 6 to rotate. The hinge rod 6 will drive the rotating plate 3 to rotate away from the fixed plate 2, thereby driving the two side support frames 7 away from the middle support frame 7, forming an arc-shaped support structure to support the top of the tunnel section. At the same time, the rotating plate 3 will push the connecting rod 15 to rotate and move outward of the cross frame 1. The connecting rod 15 will push the cross bar 14 and the support plate 16 to gradually fit into the side wall of the tunnel section, thereby supporting the side wall of the tunnel section.

[0054] When the slide bar 5 moves downward, it pulls the piston rod 9 and the piston plate 10 downward within the piston box 8. The piston plate 10 transmits the soil stabilizer in the piston box 8 to each spray hole 11 through the control valve 12, and then sprays it evenly onto the soil surface through the spray holes 11 (spraying pressure 0.3MPa, average penetration depth 25cm), which makes the soil layer solidify quickly and improves the stability of the soil layer (the compressive strength of the soil layer is increased by more than 20%).

[0055] When the arc length of the support structure formed by the support frame 7 reaches the arc length of the tunnel top, the operator can stop the operation of the first telescopic component 4, so that the support structure formed by the support frame 7 matches the size of the tunnel. At the same time, the limiting bolt 22 is inserted into the triangular block 21 through the limiting hole, so that the limiting bolt 22 and the triangular block 21 are threadedly connected, thereby maintaining the overall stability of the device.

[0056] In this embodiment, the moving distance of the support plate 16 matches the rotating distance of the support frame 7, and when fully unfolded, it can form an arc structure of approximately 210° (e.g., Figure 2 As shown, it can adapt to more than 90% of tunnel projects on the market (the "Design Specification for Highway Tunnels" (JTG D70-2018) stipulates that the common cross-sectional shape of highway tunnels is a three-centered circular arch (accounting for 70%) or a single-centered circular arch (accounting for 25%), and the central angle of the arch is usually 180-210°), effectively improving the adaptability of the device. By overlapping the support frame 7 and shrinking the second telescopic component 18, the overall volume of the device can be reduced by about 50% (the central angle of the arc-shaped support structure formed by the support frame 7 can be reduced from about 210° to about 100°), effectively improving the convenient mobility of the device.

[0057] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A large cross-section highway tunnel construction automatic support device, characterized in that, The utility model relates to a tunnel section supporting device, including controller and cross frame (1), and the top of cross frame (1) is equipped with the support component for supporting tunnel section and can overlap and contract. The support component includes a fixed plate (2) fixedly connected to the top of the cross frame (1), a plurality of rotating plates (3) rotatably fitted on the fixed plate (2), the rotating plates (3) are respectively located on both sides of the fixed plate (2), a vertical slot is formed on the fixed plate (2), a first telescopic member (4) is fixedly connected in the vertical slot, a slide rod (5) is vertically slidably fitted in the vertical slot, the output shaft of the first telescopic member (4) is fixedly connected with the slide rod (5), a plurality of hinged rods (6) are hingedly connected to the slide rod (5), the ends of the hinged rods (6) away from the slide rod (5) are hingedly connected with the adjacent rotating plates (3), arc-shaped support frames (7) are fixedly connected to the top of the fixed plate (2) and the rotating plates (3). The fixed plate (2) is further provided with a spraying assembly for spraying auxiliary liquid to improve the stability of the tunnel section, and the cross frame (1) is further provided with an expansion assembly for expanding the support range of the device as a whole; the controller is used to control the operation of the first telescopic member (4), thereby driving the slide rod (5) to vertically slide in the vertical slot, and driving the spraying assembly and the expansion assembly to operate.

2. The automatic support device for super large section highway tunnel construction according to claim 1, characterized in that, The spraying assembly includes a piston box (8) fixedly connected to the side wall of the fixed plate (2), a piston rod (9) fixedly connected to the top of the slide rod (5), the piston rod (9) extending into the piston box (8) and being fixedly connected with a piston plate (10), the piston plate (10) vertically slidably fitted with the inner side wall of the piston box (8); the piston box (8) stores auxiliary liquid; the top of the support frame (7) is provided with a plurality of spraying holes (11), the spraying holes (11) are communicated with the piston box (8), and a control valve (12) is communicated between the spraying holes (11) and the piston box (8); the top of the piston box (8) is provided with a vent hole (13).

3. The automatic support device for super large section highway tunnel construction according to claim 2, characterized in that, The auxiliary liquid includes one or more of soil stabilizer, modified cement slurry, or silicate sealant.

4. The automatic support device for super large section highway tunnel construction according to claim 3, characterized in that, The expansion assembly includes a horizontal slot symmetrically formed on the top of the cross frame (1), a horizontal rod (14) horizontally slidably fitted in the horizontal slot, a connecting rod (15) hingedly connected to one end of the horizontal rod (14), and an arc-shaped support plate (16) fixedly connected to the other end of the horizontal rod (14); the ends of the connecting rods (15) away from the horizontal rod (14) are hingedly connected with the adjacent rotating plates (3).

5. The automatic support device for super large section highway tunnel construction according to claim 4, characterized in that, Symmetrical support seats (17) are provided on the bottom of the cross frame (1), the top of each support seat (17) is fixedly connected with a second telescopic member (18), and the output shaft of each second telescopic member (18) is fixedly connected with the bottom of the cross frame (1); the controller is used to control the operation of the second telescopic member (18).

6. The automatic support device for super large section highway tunnel construction according to claim 5, characterized in that, Electric control hubs (19) are fixedly connected to the bottom of each support seat (17), and the controller is used to control the operation of the electric control hubs (19).

7. The automatic support device for super large section highway tunnel construction according to claim 6, characterized in that, Symmetrical load-bearing blocks (20) are fixedly connected to the top of the cross frame (1), and the top of each load-bearing block (20) is fixedly connected with an elastic layer.

8. The automatic support device for super large section highway tunnel construction according to claim 7, characterized in that, The rotating plates (3) are each provided with a hollow slot.

9. The automatic support device for super large section highway tunnel construction according to claim 8, characterized in that, Triangular blocks (21) are fixedly connected to both sides of the cross frame (1), and the horizontal rods (14) are slidably fitted with the adjacent triangular blocks (21).

10. The automatic support device for super large section highway tunnel construction according to claim 9, characterized in that, The crossbar (14) is provided with a plurality of limiting holes, and the triangular blocks (21) are provided with threaded holes, and the top of each threaded hole is provided with a limiting bolt (22), and the limiting bolt (22) is threadedly connected with the adjacent triangular block (21) through the limiting hole.

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