A tunnel support structure

Abstract

A tunnel supporting structure, the present application relates to the technical field of tunnel protection; The fixed plate is fixed on the left and right sides of the lower surface of the arc-shaped support plate respectively; The lifting mechanism is arranged on the lower side of the fixed plate respectively, and the lifting mechanism is connected with the two support columns symmetrical in front and back; The moving mechanism is arranged in the fixed bottom plate on the two sides respectively, and the moving mechanism is connected with the lifting mechanism; The inclined struts are fixed on the upper surface of the fixed plate in equal amounts and equal distances, the upper end of the inclined struts is inclined to one side of the center of the arc-shaped support plate, and is fixed on the inner wall of the arc-shaped support plate; The two ends of the straight struts are fixed through the fixed plate respectively, and are exposed on the other side of the fixed plate; The abutting plates are abutted on the two sides of the inner wall of the arc-shaped support plate respectively, and the abutting plates are fixed on the end of the adjacent several straight struts; The supporting component can be lifted, and after descending, the moving component can be pushed downward on the downside, so that the moving is facilitated, the moving component is hidden after the supporting component rises, and the stability of the supporting component is improved.

Description

Technical Field

[0001] This invention relates to the field of tunnel protection technology, specifically to a tunnel support structure. Background Technology

[0002] With the rapid development of infrastructure construction in my country, tunnels and underground engineering play an important role in national economic construction. However, tunnels are prone to collapse during construction, which not only affects the construction progress but also poses a threat to the lives of construction workers. Therefore, it is necessary to reinforce and support tunnels to prevent serious deformation or collapse. Construction units generally use a support structure that uses a certain number of side support rods to support both sides of the tunnel. However, during tunnel construction, it is necessary to constantly move these support components. The installation and dismantling of existing support components are relatively complicated and not conducive to tunnel construction. Summary of the Invention

[0003] The purpose of this invention is to address the shortcomings and deficiencies of the prior art by providing a tunnel support structure that is reasonably designed and easy to use. The support components can be raised and lowered, and after being lowered, the moving components can be pushed downwards to facilitate movement. After the support components are raised, the moving components can be easily hidden, thereby improving the stability of the support components.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows: it comprises a fixed base plate, supporting columns, and an arc-shaped support plate, wherein supporting columns are symmetrically arranged on the lower sides of both the left and right sides of the arc-shaped support plate, and the lower ends of the two supporting columns on the same side are respectively fixed to the front and rear sides of the upper surface of the fixed base plate; it further comprises:

[0005] The fixing plates are two in number and are respectively fixed on the left and right sides of the lower surface of the arc-shaped support plate;

[0006] The lifting mechanism consists of two parts, each located on the lower side of the fixed plate, and is connected to two symmetrical support columns at the front and rear.

[0007] The moving mechanism consists of two parts, each housed within a fixed base plate on one side. The moving mechanism is connected to the lifting mechanism.

[0008] The diagonal bracing rods consist of several rods, which are fixed equally and at equal intervals on the upper surface of the fixed plate. The upper ends of the diagonal bracing rods are inclined toward the center of the arc-shaped support plate and then fixed to the inner wall of the arc-shaped support plate.

[0009] The straight struts are of several kinds and are equally spaced from front to back between the fixed plates on both sides. The two ends of the straight struts are fixed through the fixed plates and exposed on the other side of the fixed plates.

[0010] The abutment plate consists of two plates, which abut against both sides of the inner wall of the arc-shaped support plate, and the abutment plate is fixed to the ends of several adjacent straight support rods.

[0011] The above technical solution involves using a moving mechanism to push the structure into the tunnel, then activating a lifting mechanism. The lifting mechanism moves the fixed plate upwards, and the fixed plate, through diagonal and straight struts, moves the arc-shaped support plate upwards until the arc-shaped support plate abuts against the arc-shaped inner wall on the upper side of the tunnel. As the lifting mechanism moves upwards, the moving mechanism is released, allowing the moving mechanism to retract into the fixed base plate, thus improving the stability of the structure.

[0012] As a further improvement of the present invention, the lifting mechanism includes:

[0013] The lifting internal threaded tube consists of two tubes, which are respectively fixed on the lower surface of the fixed plate. The lifting internal threaded tube is movably inserted into the support column and is arranged to abut against the moving mechanism.

[0014] The lifting screw consists of two screws, which are inserted one-to-one and screwed into the lifting inner thread tube. The lower end of the lifting screw is screwed to the inner bottom wall of the support column through a bearing.

[0015] The fixed box is fixed to the center of the upper surface of the fixed base plate. The fixed box is located between two support columns, and a drive motor is fixed on the inner top wall of the fixed box.

[0016] The storage battery is fixed inside the fixed box on one side and is connected to the drive motor.

[0017] The linkage gears consist of three gears, which are respectively sleeved and fixed on the lifting screw and the output shaft of the drive motor. The three linkage gears are connected by a chain.

[0018] Through the above technical solution, the drive motor drives the linkage gear on it to rotate, and the linkage gear drives two other linkage gears to rotate through the meshing chain. The two linkage gears drive the lifting screw inside them to rotate, and the lifting screw drives the lifting internal threaded tube to move upward. At the same time, the lifting internal threaded tube drives the fixed plate to move upward until the fixed plate moves to a suitable height.

[0019] As a further improvement of the present invention, several sliders are provided at equal angles on the outer ring wall of the lifting internal threaded tube. The sliders are slidably disposed in the groove on the inner wall of the support column, and the top wall of the groove is closed.

[0020] Through the above technical solution, the lifting internal threaded tube is guided by the slider during its up and down movement, and the slider is limited by the inner top wall of the slide groove, thereby preventing the lifting internal threaded tube from moving out of the support column and affecting the stability of the fixed plate and the arc support plate.

[0021] As a further improvement of the present invention, the moving mechanism includes:

[0022] The mounting plate is disposed inside the fixed base plate, and the outer peripheral wall of the mounting plate abuts against the inner peripheral wall of the fixed base plate.

[0023] The movable wheels are a plurality of them, and are fixed at equal intervals on the lower surface of the mounting plate. The lower side of the movable wheels passes through the lower side of the fixed base plate and is exposed on the lower side of the fixed base plate.

[0024] The push rods consist of four rods, each in an inverted "L" shape. The vertical rods are fixed to the four corners of the upper surface of the mounting plate. The vertical rods pass through the upper side wall of the fixed base plate and protrude from the upper side of the fixed base plate. The horizontal rods pass through the strip hole on the side wall of the support column and are suspended inside the support column.

[0025] The connecting rings are two in number and are respectively set on the lower side of the lifting internal thread tube. The connecting rings are movably sleeved on the lifting screw, and the outer ring walls on both sides of the connecting rings are respectively fixed on the crossbar of the adjacent push rod.

[0026] With the above technical solution, when the lifting internal threaded tube moves upward, the connecting ring is released. Under the weight of the support column and the fixed base plate, the connecting ring moves upward relative to the support column. The connecting ring drives the push rod to move upward, and the push rod drives the mounting plate to move upward, so that the mounting plate drives the moving wheel to be housed inside the fixed base plate. At this time, the fixed base plate is in contact with the ground, increasing the stability of the entire structure. When movement is required, the lifting internal threaded tube moves downward, which drives the connecting ring to move downward. The connecting ring drives the mounting plate to move downward through the push rod until the moving wheel is exposed on the underside of the fixed base plate, and then the moving wheel drives the entire structure to move.

[0027] As a further improvement of the present invention, a retaining ring is provided on the outer side of each of the support columns. The inner wall of the retaining ring is in contact with the outer wall of the support column through a sealing ring. The lower sides of the left and right side walls of the retaining ring are respectively fixed to the top of the adjacent push rod.

[0028] The above technical solution uses retaining rings to shield the strip holes on both sides of the support column, preventing dust from entering.

[0029] As a further improvement of the present invention, several guide blocks are provided at equal intervals on both sides of the mounting plate, and the guide blocks are respectively slidably disposed in the grooves on the two inner walls of the fixed base plate.

[0030] The above technical solutions increase the stability of the mounting plate when it is moved.

[0031] As a further improvement of the present invention, several drive gears are equidistantly embedded in several cavities in the two side walls of the fixed base plate. The rotating shafts on both sides of the drive gears are respectively screwed to the two side walls of the fixed base plate through bearings, and the rotating shafts on one side of several drive gears are connected through a synchronous gear transmission assembly. A rack is meshed on one side of each drive gear. The lower ends of several racks on the same side pass through the lower side wall of the fixed base plate and are equidistantly fixed on the upper surface of the support plate. The support plate and the lower side wall of the fixed base plate are arranged in the same plane. A hand screw is suspended on one side of the fixed base plate, and the hand screw is fixedly connected to the rotating shaft of one of the drive gears.

[0032] With the above technical solution, when the ground is uneven, the hand-tightening mechanism on the fixed base plate that is not in contact with the ground is rotated. The hand-tightening mechanism drives the drive gear connected to it to rotate. This drive gear drives several other drive gears to rotate through the synchronous gear transmission assembly. The drive gear drives the rack to move downward, and the rack drives the support plate to move downward until the support plate touches the ground, thereby achieving the support effect.

[0033] As a further improvement of the present invention, anti-slip pads are fixed on the lower surface of the support plate.

[0034] The above technical solutions increase the stability between the support plate and the ground.

[0035] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0036] 1. The internal support components of the arc-shaped support plate are triangular, thus using a triangular support method to improve the stability of the support;

[0037] 2. The height of the support components can be adjusted, so that they can provide support when in use and can be moved downwards when not in use for easy relocation;

[0038] 3. The movable component can be linked with the lifting component, so that it can be moved easily without affecting the support of the support component, and the operation is simple and convenient. Attached Figure Description

[0039] Figure 1 This is a schematic diagram of the structure of the present invention.

[0040] Figure 2 This is an exploded view of the support column and the fixed base plate in this invention.

[0041] Figure 3 for Figure 2 Enlarged view of section A.

[0042] Figure 4 This is an exploded view of the support column and lifting mechanism in this invention.

[0043] Figure 5 for Figure 4 Enlarged view of section B in the middle.

[0044] Figure 6 This is a schematic diagram of the structure of the present invention in use.

[0045] Explanation of reference numerals in the attached figures:

[0046] 1. Fixed base plate, 2. Support column, 3. Arc-shaped support plate, 4. Fixed plate, 5. Lifting mechanism, 5-1. Lifting internal threaded pipe, 5-2. Lifting screw, 5-3. Fixed box, 5-4. Drive motor, 5-5. Battery, 5-6. Linkage gear, 6. Moving mechanism, 6-1. Mounting plate, 6-2. Moving wheel, 6-3. Push rod, 6-4. Connecting ring, 7. Diagonal support rod, 8. Straight support rod, 9. Contact plate, 12. Slider, 11. Retaining ring, 10. Guide block, 13. Drive gear, 14. Rack, 15. Support plate, 16. Hand screw, 17. Anti-slip pad. Detailed Implementation

[0047] The invention will now be further described with reference to the accompanying drawings.

[0048] Example 1:

[0049] like Figure 1-2 , Figure 6 As shown, this embodiment includes a fixed base plate 1, support columns 2, and an arc-shaped support plate 3. Support columns 2 are symmetrically arranged on the lower sides of both the left and right sides of the arc-shaped support plate 3. The lower ends of the two support columns 2 on the same side are riveted and fixed to the front and rear sides of the upper surface of the fixed base plate 1, respectively. It also includes:

[0050] Fixing plate 4, there are two fixing plates 4, and they are respectively set on the left and right sides of the lower surface of the arc-shaped support plate 3;

[0051] Lifting mechanism 5, there are two lifting mechanisms 5, and they are respectively set on the lower side of the fixed plate 4. The lifting mechanism 5 is connected to two support columns 2 that are symmetrical in front and behind.

[0052] The moving mechanism 6 consists of two parts, which are respectively installed in the fixed base plate 1 on both sides. The moving mechanism 6 is connected to the lifting mechanism 5.

[0053] The diagonal bracing rod 7 consists of several rods, which are welded and fixed to the upper surface of the fixing plate 4 in equal quantity and at equal intervals. The upper end of the diagonal bracing rod 7 is inclined to one side of the center of the arc-shaped support plate 3 and then welded and fixed to the inner wall of the arc-shaped support plate 3.

[0054] The straight support rod 8 consists of several rods, which are equidistantly arranged between the two fixing plates 4 from front to back. The two ends of the straight support rod 8 are fixed through the fixing plate 4 and exposed on the other side of the fixing plate 4.

[0055] The abutment plate 9 consists of two plates, which abut against both sides of the inner wall of the arc-shaped support plate 3. The abutment plate 9 is welded and fixed to the ends of several adjacent straight support rods 8.

[0056] Example 2:

[0057] See Figure 1-2 , Figure 4-6 As shown, based on Embodiment 1, the lifting mechanism 5 includes:

[0058] Two lifting internal threaded tubes 5-1 are welded and fixed to the lower surface of the fixing plate 4. The lifting internal threaded tubes 5-1 are movably inserted into the support column 2 and are in contact with the moving mechanism 6. Several sliders 12 are welded at equal angles on the outer ring wall of the lifting internal threaded tube 5-1. The sliders 12 are slidably disposed in the slide groove on the inner wall of the support column 2, and the top wall of the slide groove is closed. During the up and down movement of the lifting internal threaded tube 5-1, it is guided by the sliders 12, and at the same time, the sliders 12 are limited by the inner top wall of the slide groove, so as to prevent the lifting internal threaded tube 5-1 from moving out of the support column 2 and affecting the stability of the fixing plate 4 and the arc-shaped support plate 3.

[0059] The lifting screw 5-2 consists of two screws, which are inserted one-to-one and screwed into the lifting inner thread tube 5-1. The lower end of the lifting screw 5-2 is screwed to the inner bottom wall of the support column 2 through a bearing.

[0060] The fixed box 5-3 is riveted and fixed to the center of the upper surface of the fixed base plate 1. The fixed box 5-3 is located between two support columns 2. The drive motor 5-4 is riveted and fixed to the inner top wall of the fixed box 5-3.

[0061] Battery 5-5 is riveted and fixed to the right side inside the fixed box 5-3, and battery 5-5 is connected to drive motor 5-4;

[0062] There are three linkage gears 5-6, which are respectively sleeved and welded to the output shaft of the lifting screw 5-2 and the drive motor 5-4. The three linkage gears 5-6 are connected by a chain.

[0063] Example 3:

[0064] See Figure 1-5As shown, based on Embodiment 1, the moving mechanism 6 includes:

[0065] Mounting plate 6-1 is disposed inside fixed base plate 1, and the outer peripheral wall of mounting plate 6-1 abuts against the inner peripheral wall of fixed base plate 1; several guide blocks 10 are riveted at equal intervals on both sides of mounting plate 6-1, and the guide blocks 10 are respectively slidably disposed in the sliding grooves on the two inner walls of fixed base plate 1 to increase the stability of mounting plate 6-1 when moving.

[0066] The movable wheels 6-2 are several in number and are riveted and fixed at equal intervals to the lower surface of the mounting plate 6-1. The lower side of the movable wheels 6-2 passes through the lower side of the fixed base plate 1 and is exposed on the lower side of the fixed base plate 1.

[0067] There are four push rods 6-3, all of which are arranged in an inverted "L" shape. The vertical rods of the push rods 6-3 are riveted and fixed to the four corners of the upper surface of the mounting plate 6-1. After the vertical rods of the push rods 6-3 pass through the upper side wall of the fixed base plate 1, they are exposed on the upper side of the fixed base plate 1. After the horizontal rods of the push rods 6-3 pass through the strip hole on the side wall of the support column 2, they are suspended in the support column 2.

[0068] A retaining ring 11 is fitted on the outer side of each support column 2. The inner wall of the retaining ring 11 is set to abut against the outer wall of the support column 2 through a sealing ring. The lower sides of the left and right side walls of the retaining ring 11 are respectively riveted and fixed to the top of the adjacent push rod 6-3. The retaining ring 11 blocks the strip holes on the side walls of the support column 2 to prevent dust from entering.

[0069] There are two connecting rings 6-4, which are respectively set on the lower side of the lifting internal thread tube 5-1. The connecting rings 6-4 are movably sleeved on the lifting screw 5-2. The outer ring walls on both sides of the connecting rings 6-4 are respectively welded and fixed to the crossbar of the adjacent push rod 6-3.

[0070] Example 4:

[0071] See Figure 2 , Figure 3As shown, based on Embodiment 1, several drive gears 13 are equidistantly embedded in several cavities within the side walls of the fixed base plate 1. The rotating shafts on both sides of the drive gears 13 are respectively screwed to the side walls of the fixed base plate 1 via bearings, and the rotating shafts on one side of several drive gears 13 are connected via a synchronous gear transmission assembly. A rack 14 is meshed on one side of each drive gear 13. The lower ends of several racks 14 on the same side pass through the lower side wall of the fixed base plate 1 and are riveted and fixed to the upper surface of the support plate 15 at equal intervals. The support plate 15 and the lower side wall of the fixed base plate 1 are arranged in the same plane. Anti-slip pads 17 are glued and fixed to the lower surface of the support plate 15 to increase the stability between the support plate 15 and the ground. A hand-operated screwdriver 16 is suspended on one side of the fixed base plate 1, and the hand-operated screwdriver 16 is riveted and fixed to the rotating shaft of the drive gear 13 on the front side.

[0072] When using this invention, the moving mechanism 6 pushes the structure into the tunnel. The drive motor 5-4 drives the linkage gear 5-6 on it to rotate. The linkage gear 5-6 drives two other linkage gears 5-6 to rotate through a meshing chain. The two linkage gears 5-6 respectively drive the lifting screw 5-2 inside to rotate. The lifting screw 5-2 drives the lifting internal threaded tube 5-1 to move upward. The lifting internal threaded tube 5-1 simultaneously drives the fixing plate 4 to move upward until the fixing plate 4 moves to a suitable height. The fixing plate 4 drives the arc-shaped support plate 3 to move upward through the diagonal support rod 7 and the straight support rod 8 until the arc-shaped support plate 3 abuts against the arc-shaped inner wall on the upper side of the tunnel. When the lifting internal threaded tube 5-1 moves upward, the connecting ring 6-4 is released. Under the weight of the support column 2 and the fixing base plate 1, the connecting ring 6-4 moves upward relative to the support column 2. The connecting ring 6-4 drives the push rod 6-3 to move upward. The push rod 6-3 carries... The mounting plate 6-1 moves upward, causing the moving wheel 6-2 to be retracted into the fixed base plate 1. At this time, the fixed base plate 1 is in contact with the ground, increasing the stability of the entire structure. When the ground is uneven, the hand-crank 16 on the fixed base plate 1 that is not in contact with the ground is rotated. The hand-crank 16 drives the drive gear 13 connected to it to rotate. The drive gear 13 drives several other drive gears 13 to rotate through the synchronous gear transmission assembly. The drive gear 13 drives the rack 14 to move downward. The rack 14 drives the support plate 15 to move downward until the support plate 15 is in contact with the ground, thus achieving the support effect. When movement is required, the lifting internal thread tube 5-1 moves downward, which drives the connecting ring 6-4 to move downward. The connecting ring 6-4 drives the mounting plate 6-1 to move downward through the push rod 6-3 until the moving wheel 6-2 is exposed on the lower side of the fixed base plate 1. Then, the moving wheel 6-2 drives the entire structure to move.

[0073] Compared with the prior art, the beneficial effects of this specific embodiment are as follows:

[0074] 1. The internal support components of the arc-shaped support plate 3 are triangular, thus adopting a triangular support method to improve the stability of the support;

[0075] 2. The height of the support components can be adjusted, so that they can provide support when in use and can be moved downwards when not in use for easy relocation;

[0076] 3. The movable component can be linked with the lifting component, so that it can be moved easily without affecting the support of the support component, and the operation is simple and convenient.

[0077] The above description is only used to illustrate the technical solution of the present invention and is not intended to limit it. Any other modifications or equivalent substitutions made by those skilled in the art to the technical solution of the present invention, as long as they do not depart from the spirit and scope of the technical solution of the present invention, should be covered within the scope of the claims of the present invention.

Claims

1. A tunnel support structure, characterized by, It contains fixed bottom plate (1), support column (2) and arc support plate (3), the lower side of the left and right sides of the arc support plate (3) is provided with support column (2) symmetrically, the lower end of the two support columns (2) on the same side is fixed on the upper surface of the fixed bottom plate (1) respectively. Fixed plate (4), the fixed plate (4) is two, and it is fixed on the left and right sides of the lower surface of the arc support plate (3) respectively. Lifting mechanism (5), the lifting mechanism (5) is two, and it is respectively arranged on the lower side of the fixed plate (4), and the lifting mechanism (5) is connected with the two support columns (2) symmetrically. Moving mechanism (6), the moving mechanism (6) is two, and it is respectively arranged in the fixed bottom plate (1) on both sides, and the moving mechanism (6) is connected with the lifting mechanism (5). Inclined support rod (7), the inclined support rod (7) is several, and it is equal and equidistantly fixed on the upper surface of the fixed plate (4), and the upper end of the inclined support rod (7) is inclined to one side of the center of the arc support plate (3), and is fixed on the inner wall of the arc support plate (3). Straight support rod (8), the straight support rod (8) is several, and it is equidistantly arranged between the fixed plate (4) on both sides from front to back, and the two ends of the straight support rod (8) are fixed through the fixed plate (4) respectively, and are exposed on the other side of the fixed plate (4). The abutting plate (9) is two, and it is respectively abutted on the two sides of the inner wall of the arc support plate (3), and the abutting plate (9) is fixed on the end of the several straight support rods (8) adjacent to it. The lifting mechanism (5) comprises: Lifting inner threaded pipe (5-1), the lifting inner threaded pipe (5-1) is two, and it is respectively fixed on the lower surface of the fixed plate (4), and the lifting inner threaded pipe (5-1) is movably inserted in the support column (2), and the lifting inner threaded pipe (5-1) is abutted with the moving mechanism (6). Lifting screw rod (5-2), the lifting screw rod (5-2) is two, and it is correspondingly inserted and screwed in the lifting inner threaded pipe (5-1), and the lower end of the lifting screw rod (5-2) is screwed with the inner bottom wall of the support column (2) through a bearing. Fixed box (5-3), the fixed box (5-3) is fixed on the center of the upper surface of the fixed bottom plate (1), and the fixed box (5-3) is located between the two support columns (2), and the inner top wall of the fixed box (5-3) is fixed with a driving motor (5-4). Battery (5-5), the battery (5-5) is fixed on one side in the fixed box (5-3), and the battery (5-5) is connected with the driving motor (5-4). Linkage gear (5-6), the linkage gear (5-6) is three, and it is respectively sleeved and fixed on the lifting screw rod (5-2) and the output shaft of the driving motor (5-4), and the three linkage gears (5-6) are connected through a chain.

2. A tunnel support structure according to claim 1, characterised in that: The outer ring wall of the lifting inner threaded pipe (5-1) is provided with a plurality of sliding blocks (12) at equal angles, the sliding blocks (12) are slidingly arranged in the sliding groove on the inner wall of the support column (2), and the top wall of the sliding groove is arranged in a closed manner.

3. A tunnel support structure according to claim 1, wherein: The moving mechanism (6) comprises: A mounting plate (6-1) is arranged in the fixed base plate (1), and the outer peripheral wall of the mounting plate (6-1) is arranged in abutment with the inner peripheral wall of the fixed base plate (1); A plurality of moving wheels (6-2) are equidistantly fixed on the lower surface of the mounting plate (6-1), and the lower side of the moving wheels (6-2) is exposed on the lower side of the fixed base plate (1) after passing through the lower side of the fixed base plate (1); Four push rods (6-3) are arranged in inverted "L" shape, the vertical rods of the push rods (6-3) are fixed on the four corners of the upper surface of the mounting plate (6-1), the vertical rods of the push rods (6-3) are exposed on the upper side of the fixed base plate (1) after passing through the upper side wall of the fixed base plate (1), and the horizontal rods of the push rods (6-3) are suspended in the support column (2) after passing through the strip-shaped holes on the side wall of the support column (2); Two connecting rings (6-4) are arranged on the lower side of the lifting inner threaded pipe (5-1) in one-to-one correspondence, the connecting rings (6-4) are movably sleeved on the lifting screw rod (5-2), and the outer ring walls on the two sides of the connecting rings (6-4) are fixed on the horizontal rods of the push rods (6-3) adjacent thereto.

4. A tunnel support structure according to claim 3, wherein: The outer sides of the support columns (2) are sleeved with stop rings (11), the inner walls of the stop rings (11) are arranged in abutment with the outer walls of the support columns (2) through sealing rings, and the lower sides of the left and right side walls of the stop rings (11) are fixed on the top ends of the push rods (6-3) adjacent thereto.

5. A tunnel support structure according to claim 3, wherein: A plurality of guide blocks (10) are equidistantly arranged on the side walls of the mounting plate (6-1), and the guide blocks (10) are slidingly arranged in the sliding grooves on the inner walls of the fixed base plate (1).

6. A tunnel support structure according to claim 1, wherein: A plurality of drive gears (13) are equidistantly embedded in the cavities in the inner walls of the side walls of the fixed base plate (1), the rotating shafts on the two sides of the drive gears (13) are rotatably connected with the side walls of the fixed base plate (1) through bearings, the rotating shafts on one side of the drive gears (13) are connected through a synchronous wheel transmission assembly, a rack (14) is arranged on one side of each drive gear (13), the lower ends of the plurality of racks (14) on the same side are fixed on the upper surface of a support plate (15) after passing through the lower side wall of the fixed base plate (1), the support plate (15) is arranged in the same plane with the lower side wall of the fixed base plate (1), and a hand knob (16) is suspended on one side of the fixed base plate (1) and fixedly connected with the rotating shaft of one of the drive gears (13).

7. A tunnel support structure according to claim 6, characterised in that: The lower surface of the support plate (15) is fixed with an anti-skid pad (17).

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