Active support structure for preventing collapse of large-section tunnel in jointed rock mass

Abstract

The present invention relates to the field of tunnel excavation protection technology, and discloses an active support structure for preventing collapse of a large-section tunnel in a jointed rock mass, comprising an arch frame, mounting plates fixedly connected to both sides of the bottom of the arch frame, first bolt fasteners provided on both mounting plates, and an active component provided between the arch frame and the two mounting plates. The active support structure for preventing collapse of a large-section tunnel in a jointed rock mass, drives a protective component to move to a blasting excavation area and drives the support component to extend synchronously through two driving components, protects the tunnel face through the protective mesh in the protective component, protects the free face through the arrangement of an arched protective belt, a plurality of groups of sliding rods and an arch frame, and forms an active support work for the free face in conjunction with the lifting of the active component, thereby simultaneously performing active support on the tunnel excavation tunnel face and the free face, thereby improving the functionality and practicality of the support structure.

Description

Technical Field

[0001] The present invention relates to the technical field of tunnel excavation protection, in particular to an active support structure for preventing collapse of a jointed rock mass super-large cross-section tunnel. Background Art

[0002] A tunnel refers to a passage dug out in an existing building or earth-rock structure. It is an engineering structure buried in the ground. Existing tunnels are generally excavated by shield machines or blasting methods. The specific excavation method is generally selected according to the actual terrain. The blasting excavation method of the tunnel is to drill holes in the tunnel face and set corresponding explosives in the holes for blasting. After excavation, it is generally necessary to install initial support in the tunnel, such as anchor rods, steel frames, sprayed concrete, etc., and after underground excavation, active artificial support is carried out before the surrounding rock undergoes excessive deformation or breakage to avoid damage due to excessive deformation. By improving the support method and controlling the mine pressure, the safe, healthy, continuous and stable development of the mine is ensured.

[0003] At present, there are certain defects in the process of tunnel blasting excavation in jointed rock areas. For example, when tunnel blasting excavation is carried out by drilling and blasting, after the slag is discharged, the initial support during this period cannot provide stable support, so the tunnel face after blasting excavation and the air-facing face blasted out are prone to problems such as falling blocks, collapse, and collapse, which can easily cause safety accidents. Summary of the Invention

[0004] (1) Technical problems solved

[0005] In view of the deficiencies in the prior art, the present invention provides an active support structure for preventing collapse of a large-section tunnel in jointed rock. By setting two driving components, the protection component can be driven to move to the blasting excavation area and the support component can be driven to extend synchronously. The protection mesh in the protection component can protect the heading face, thereby improving the protection effect of tunnel blasting excavation. The extension of the support component can increase the range of its active support. By setting an arched protection belt, several groups of sliding rods and an arch frame, the free face can be protected, and the active support work of the free face can be formed by coordinating the lifting of the active component. Moreover, the contraction of the driving component and the active component facilitates subsequent permanent support operations. It has a good support connection function, and solves the problem in the prior art that after the blasting and slag discharge of the jointed rock tunnel, the initial support in this period has not taken effect, so that the tunnel heading face and the free face formed by blasting are prone to block falling, collapse, and collapse.

[0006] (2) Technical solution

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an active support structure for preventing collapse of a super-large cross-section tunnel in jointed rock mass, comprising an arch frame, both sides of the bottom of the arch frame are fixedly connected to mounting plates, both mounting plates are provided with first bolt fasteners, an active component is provided between the arch frame and the two mounting plates, one side of the arch frame is slidably connected to three groups of sliding rods, and one end of the three groups of sliding rods is fixedly connected to a driving plate, the other ends of the three groups of sliding rods are provided with a support component for protecting the free face of the tunnel, a protective component for protecting the tunnel face is installed on a group of sliding rods located above, and two driving components for extending and driving the support component are provided at the bottom of one side of the arch frame;

[0008] The active component includes a U-shaped frame fixed to the top of the mounting plate, the U-shaped frame is slidably connected to a lifting block inside, and the top of the lifting block is fixedly connected to a jacking block, the top of the jacking block is fixed to the bottom of the arch frame, and a third hydraulic telescopic rod is fixedly connected between the bottom of the inner wall of the U-shaped frame and the lifting block. The support component includes an arch block fixed between the other ends of the three groups of sliding rods, and a contracted arched protective belt is fixedly connected between the arch block and the arch frame. The protection component includes a protective mesh plate for protecting the tunnel face, and the drive component includes a first hydraulic telescopic rod for longitudinally driving one of the drive plates.

[0009] Preferably, both sides of the bottom of the arch block are fixedly connected with collecting blocks for collecting stones to the middle, and the inner side surfaces of the two collecting blocks are set as arc surfaces, and a conical puncture strip is fixedly connected to one side of the arch block.

[0010] Preferably, the protection assembly includes a first connecting frame fixed on a set of sliding rods located above, and the top of the protection mesh plate is connected to the bottom of the first connecting frame.

[0011] Preferably, the top of the protective mesh is hinged to the bottom of the first connecting frame, and the outer surface of the group of sliding rods is fixedly connected to the second connecting frame, the second connecting frame is located on one side of the first connecting frame, and the bottom of the second connecting frame is hinged with an inclined second hydraulic telescopic rod, and the bottom end of the second hydraulic telescopic rod is hinged to the inner side surface of the protective mesh.

[0012] Preferably, a sliding block is fixedly connected to the bottom of one side of the arch frame, a second bolt fastener is fixedly installed on one side of the bottom of the sliding block, a movable plate is provided on the top of the sliding block, and the first hydraulic telescopic rod is fixed inside the movable plate, and the telescopic end of the first hydraulic telescopic rod is fixedly connected to the driving plate located on the side.

[0013] Preferably, the movable plate is slidably connected to the bottom of the sliding block, a groove is provided on the top of the sliding block, and a group of locking blocks are fixedly connected to the inside of the groove, and a locking assembly is provided on one side of the movable plate, and the locking assembly includes a T-shaped limit block slidably connected to one side of the movable plate, and the bottom of the T-shaped limit block is used to be inserted between two adjacent locking blocks to form a locking between the movable plate and the sliding block.

[0014] Preferably, the tops of a group of locking blocks are all configured as inclined surfaces, and one side of the bottom of the T-shaped limit block is configured as an inclined surface.

[0015] Preferably, the top of one side of the T-shaped limit block is fixedly connected to a support plate, and one side of the movable plate is fixedly connected to two springs through the support plate, and the bottom ends of the two springs are fixed to the top of the T-shaped limit block, and a movable hole is opened inside the support plate, and a U-shaped operating rod is inserted into the inside of the movable hole, and one end of the U-shaped operating rod is rotatably connected to the top of the T-shaped limit block.

[0016] (3) Beneficial effects

[0017] Compared with the existing technology, the present invention provides an active support structure for preventing collapse of large-section tunnels in jointed rock mass, which has the following beneficial effects:

[0018] 1. The present invention can drive the protection component to move to the blasting excavation area and drive the support component to extend synchronously through the arrangement of two driving components. The protection mesh in the protection component can protect the tunnel face, thereby improving the protection effect of tunnel blasting excavation. The extension of the support component can increase the range of its active support. The arched protection belt, several groups of sliding rods and arch frames can be used to protect the free face. In combination with the lifting of the active component, active support work of the free face can be formed. Moreover, the contraction of the driving component and the active component facilitates subsequent permanent support operations. It has a good support connection function and solves the problem in the prior art that after blasting and discharging slag in jointed rock tunnels, the initial support in this period has not taken effect, so that the tunnel face and the free face formed by blasting are prone to block falling, collapse, and collapse.

[0019] 2. The present invention provides an inclined surface at the top of a group of locking blocks and the bottom of the T-shaped limit block, so that the movable plate can be locked in one direction with the sliding block through the T-shaped limit block, so that after the driving plate is squeezed and stretched by the first hydraulic telescopic rod, the movable plate can move laterally when the first hydraulic telescopic rod is retracted, thereby increasing the squeezing and pushing distance of the driving plate. There is no need to set a hydraulic cylinder for long-distance pushing, which improves the functionality and practicality of the driving component and solves the problem in the prior art that the blasting excavation depth is generally about one meter, so that a telescopic cylinder with an extension length of at least one meter is required, and the support structure needs to be installed in the blasting safety zone, so that the length of the telescopic cylinder needs to be set according to actual conditions, which reduces the jacking and feeding effect of the support component and the protective component.

[0020] 3. The present invention can use the elastic force of the two springs to insert the T-shaped limit block downward between the two locking blocks at the corresponding positions, so that the movable plate and the sliding block are locked, ensuring the stability of the first hydraulic telescopic rod in pushing the support assembly and the protective assembly. Through the setting of the U-shaped operating rod, it is not only convenient for the staff to retract the T-shaped limit block upward, but also to rotate the U-shaped operating rod ninety degrees after being pulled upward by hand, so that the other end of the U-shaped operating rod contacts the top of the support plate, thereby ensuring the stability of the T-shaped limit block after retraction, which is not only convenient for the staff to adjust the initial position of the driving end of the driving assembly, but also convenient for the staff to reset and adjust the driving assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the present invention;

[0022] Figure 2 For the present invention Figure 1 A side view of the structure;

[0023] Figure 3 For the present invention Figure 1 Schematic cross-section diagram;

[0024] Figure 4 For the present invention Figure 1 Schematic diagram of the structure of the middle support assembly;

[0025] Figure 5 For the present invention Figure 4 Structural side view of the middle support assembly;

[0026] Figure 6 For the present invention Figure 5 Schematic diagram of the structure of the middle protection component;

[0027] Figure 7 For the present invention Figure 1 Transmission diagram of the middle drive assembly and drive plate;

[0028] Figure 8 For the present invention Figure 7 A partial cross-sectional view of the middle drive assembly;

[0029] Figure 9 For the present invention Figure 8 Schematic diagram of the structure of the locking assembly.

[0030] In the figure: 1. Arch frame;

[0031] 2. Active component; 21. U-shaped frame; 22. Lifting block; 23. Lifting block; 24. Third hydraulic telescopic rod;

[0032] 3. Sliding rod; 4. Driving plate;

[0033] 5. Support assembly; 51. Arch block; 52. Arch protection belt; 53. Collection block; 54. Conical puncture strip;

[0034] 6. Protection assembly; 61. Protection mesh; 62. First connecting frame; 63. Second connecting frame; 64. Second hydraulic telescopic rod;

[0035] 7. Drive assembly; 71. First hydraulic telescopic rod; 72. Sliding block; 73. Movable plate; 74. Locking block;

[0036] 8. Locking assembly; 81. T-type limit block; 82. Support plate; 83. Spring; 84. U-shaped operating lever. DETAILED DESCRIPTION

[0037] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0038] Example 1:

[0039] Refer to the attached Figure 1-9 , an active support structure for preventing collapse of a large-section tunnel in jointed rock mass, comprising an arch frame 1, both sides of the bottom of the arch frame 1 are fixedly connected with mounting plates, both mounting plates are provided with first bolt fasteners, an active component 2 is provided between the arch frame 1 and the two mounting plates, three groups of sliding rods 3 are slidably connected to one side of the arch frame 1, and one end of the three groups of sliding rods 3 is fixedly connected with a driving plate 4, the other end of the three groups of sliding rods 3 is provided with a support component 5 for protecting the free face of the tunnel, a protection component 6 for protecting the tunnel face is installed on a group of sliding rods 3 located above, and two driving components 7 for extending and driving the support component 5 are provided at the bottom of one side of the arch frame 1;

[0040] By setting the support assembly 5, the free face of the tunnel can be protected, and by setting the protection assembly 6, the tunnel face can be protected, thereby improving the protection of the tunnel against blasting excavation. The support assembly 5 and the protection assembly 6 are both connected to the sliding rod 3 so as to facilitate feeding and driving by the drive assembly 7, thereby forming an active support operation and improving the convenience of protection.

[0041] The active component 2 includes a U-shaped frame 21 fixed to the top of the mounting plate, a lifting block 22 is slidably connected to the inside of the U-shaped frame 21, and a lifting block 23 is fixedly connected to the top of the lifting block 22, and the top of the lifting block 23 is fixed to the bottom of the arch frame 1, and a third hydraulic telescopic rod 24 is fixedly connected between the bottom of the inner wall of the U-shaped frame 21 and the lifting block 22. The support component 5 includes an arch block 51 fixed between the other ends of the three groups of sliding rods 3, and a contracted arched protective belt 52 is fixedly connected between the arch block 51 and the arch frame 1. The protection component 6 includes a protective mesh plate 61 for protecting the tunnel face, and the drive component 7 includes a first hydraulic telescopic rod 71 for longitudinally driving one of the drive plates 4;

[0042] The third hydraulic telescopic rod 24 is connected to the external power supply and control switch, and is used to drive the lifting block to move up and down. The upward movement of the lifting block can drive the arch frame 1 to move upward through the jacking block 23, thereby forming an active support for the free face of the tunnel and controlling the mine pressure to avoid damage caused by excessive deformation;

[0043] The first hydraulic telescopic rod 71 is connected to the external power supply and control switch. By starting the first hydraulic telescopic rod 71 in the two drive assemblies 7, the drive plates 4 on both sides can be pressed, so that the two sets of sliding rods 3 are driven, and then the arch block 51 and the protection assembly 6 in the support assembly 5 can be driven to move to the blasting excavation area, and the protection assembly 6 can simultaneously form an active support work for the tunnel face. In addition, through the arrangement of the arch protection belt 52, several sets of sliding rods and the arch frame 1, the free face can be protected. By lifting the third hydraulic telescopic rod 24 in the active assembly 2, the free face active support work can be formed.

[0044] The protection mesh plate 61 in the protection component 6 can be used to protect the face, and in conjunction with the drive component 7, active support work of the face can be formed, thereby improving the protection effect of tunnel blasting and excavation, and through the contraction of the drive component 7 and the active component 2, it is convenient to carry out subsequent permanent support operations, and has a good support connection function, which solves the problem in the prior art that after the blasting of the jointed rock tunnel, the initial support in this period has not taken effect, so that the tunnel face and the blasted air-facing surface are prone to block falling, collapse, collapse, etc., which can easily cause safety accidents.

[0045] Refer to the attached Figure 2 、 Figure 4 and Figure 5 , both sides of the bottom of the arch block 51 are fixedly connected with a collection block 53 for collecting stones to the middle, and the inner side surfaces of the two collection blocks 53 are set as arc surfaces, and a conical puncture strip 54 is fixedly connected to one side of the arch block 51;

[0046] By setting the inner side surfaces of the two collecting blocks 53 to be arc-shaped, the stones on both sides of the tunnel can be gathered to the middle when the arch block 51 is fed. This not only improves the convenience of subsequent stone cleaning, but also cooperates with the setting of the two conical puncture bars 54 to improve the smoothness of the feeding movement of the support component 5.

[0047] Refer to the attached Figure 5 and Figure 6 The protection assembly 6 includes a first connecting frame 62 fixed on a set of sliding rods 3 located above, and the top of the protection mesh plate 61 is connected to the bottom of the first connecting frame 62;

[0048] The provision of the first connecting frame 62 not only facilitates the installation of the protective mesh 61 and the sliding rod 3, but also secures the protective mesh 61 to the first connecting frame 62, thereby ensuring the stability of the protective mesh 61 after installation and improving its protective effect.

[0049] Refer to the attached Figure 5 and Figure 6 The top of the protective mesh plate 61 is hinged to the bottom of the first connecting frame 62, and the outer surface of the group of sliding rods 3 is fixedly connected to the second connecting frame 63, the second connecting frame 63 is located on one side of the first connecting frame 62, and the bottom of the second connecting frame 63 is hinged with an inclined second hydraulic telescopic rod 64, and the bottom end of the second hydraulic telescopic rod 64 is hinged to the inner side of the protective mesh plate 61;

[0050] The second hydraulic telescopic rod 64 is connected to the external power supply and control switch, and is connected to the bottom of the first connecting frame 62 in a hinged manner through the protective mesh 61, so that by starting the second hydraulic telescopic rod 64, the protective mesh 61 can be driven to move in a fan shape at the hinged position, forming a contraction or expansion movement. By expanding the protective mesh 61, the high position of the palm face can be protected, reducing the phenomenon of falling blocks, collapse, and collapse at the high position of the palm face. By contracting the protective mesh 61, it is convenient for subsequent cleaning vehicles to clean up the stones, thereby improving the convenience of its operation.

[0051] Refer to the attached Figure 7 and Figure 8The bottom of one side of the arch frame 1 is fixedly connected with a sliding block 72, one side of the bottom of the sliding block 72 is fixedly installed with a second bolt fastener, the top of the sliding block 72 is provided with a movable plate 73, and the first hydraulic telescopic rod 71 is fixed inside the movable plate 73, and the telescopic end of the first hydraulic telescopic rod 71 is fixedly connected to the driving plate 4 located on the side;

[0052] The sliding block 72 is fixed to the bottom of the tunnel using a second bolt fastener to further ensure the stability of its support structure during operation. The movable plate 73 is fixedly connected to the top of the sliding block 72. The movable plate 73 is fixedly connected to the top of the sliding block 72 through the first hydraulic telescopic rod 71 to further ensure the stability of the first hydraulic telescopic rod 71 during operation.

[0053] Example 2: Based on Example 1, the difference is that;

[0054] Refer to the attached Figure 8 and Figure 9 The movable plate 73 is slidably connected to the bottom of the sliding block 72. A groove is provided on the top of the sliding block 72, and a group of locking blocks 74 are fixedly connected to the inside of the groove. A locking assembly 8 is provided on one side of the movable plate 73. The locking assembly 8 includes a T-shaped limit block 81 slidably connected to one side of the movable plate 73, and the bottom of the T-shaped limit block 81 is used to be inserted between two adjacent locking blocks 74 to form a locking between the movable plate 73 and the sliding block 72;

[0055] The movable plate 73 is slidably connected to the top of the sliding block 72, so that the staff can adjust the position of the movable plate 73, thereby adjusting the initial position of the first hydraulic telescopic rod 71, satisfying the advancement of the support component 5 and the protection component 6 under different circumstances. The T-shaped limit block 81 in the locking component 8 is inserted between two adjacent locking blocks 74 to ensure the stability of the movable plate 73 after position adjustment, thereby improving the stability of the first hydraulic telescopic rod 71 in advancing the support component 5 and the protection component 6.

[0056] The tops of a set of locking blocks 74 are all configured as inclined surfaces, and one side of the bottom of the T-shaped limit block 81 is configured as an inclined surface;

[0057] By setting the top of a group of locking blocks 74 and the bottom of the T-shaped limit block 81 as inclined surfaces, the movable plate 73 is conveniently locked in one direction by the T-shaped limit block 81 and the sliding block 72, so that after the driving plate 4 is squeezed and stretched by the first hydraulic telescopic rod 71, when the first hydraulic telescopic rod 71 contracts, its movable plate 73 can move laterally, thereby increasing the squeezing and pushing distance of its driving plate 4, and eliminating the need to set a long-distance pushing hydraulic cylinder, thereby improving the functionality and practicality of the driving component 7, and solving the problem in the prior art that the blasting excavation depth is generally about one meter, so that a telescopic cylinder with an extension length of at least one meter is required, and the support structure needs to be installed in the blasting safety zone, so that the length of the telescopic cylinder needs to be set according to actual conditions, thereby reducing the jacking and feeding effect of the support component 5 and the protection component 6.

[0058] Example 3: Based on Example 1, the difference is that;

[0059] Refer to the attached Figure 8 and Figure 9 The top of one side of the T-shaped limit block 81 is fixedly connected to a support plate 82, and one side of the movable plate 73 is fixedly connected to two springs 83 through the support plate 82. The bottom ends of the two springs 83 are fixed to the top of the T-shaped limit block 81. A movable hole is opened inside the support plate 82, and a U-shaped operating rod 84 is inserted into the movable hole. One end of the U-shaped operating rod 84 is rotatably connected to the top of the T-shaped limit block 81;

[0060] The elastic force of the two springs 83 can press the T-shaped limit block 81 downward, so that the T-shaped limit block 81 moves downward and is inserted between the two locking blocks 74 at the corresponding positions, so that the movable plate 73 and the sliding block 72 are locked, ensuring the stability of the telescopic drive of the first hydraulic telescopic rod 71;

[0061] The setting of the U-shaped operating rod 84 not only makes it convenient for the staff to pull upward to form the upward contraction of the T-shaped limit block 81, but also allows the staff to rotate the U-shaped operating rod 84 ninety degrees after being pulled upward by hand, so that the other end of the U-shaped operating rod 84 contacts the top of the support plate 82, thereby ensuring the stability of the T-shaped limit block 81 after contraction, which not only makes it convenient for the staff to adjust the initial position of the driving end of the driving component 7, but also makes it convenient for the staff to reset the driving component 7.

[0062] It should be noted that the term "comprises" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article, or apparatus that includes a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprises a ..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the element.

[0063] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. An active support structure for preventing collapse of a large-section tunnel in a jointed rock mass, comprising an arch frame (1), wherein both sides of the bottom of the arch frame (1) are fixedly connected to mounting plates, and both mounting plates are provided with first bolt fasteners, characterized in that: An active component (2) is provided between the arch frame (1) and the two mounting plates; three groups of sliding rods (3) are slidably connected to one side of the arch frame (1); one end of each of the three groups of sliding rods (3) is fixedly connected to a driving plate (4); the other ends of the three groups of sliding rods (3) are provided with a supporting component (5) for protecting the tunnel's free surface; a protecting component (6) for protecting the tunnel's face is installed on the upper group of sliding rods (3); and two driving components (7) for extending and driving the supporting component (5) are provided at the bottom of one side of the arch frame (1); The active component (2) includes a U-shaped frame (21) fixed to the top of the mounting plate, the U-shaped frame (21) is slidably connected to a lifting block (22) inside, and the top of the lifting block (22) is fixedly connected to a jacking block (23), the top of the jacking block (23) is fixed to the bottom of the arch frame (1), and a third hydraulic telescopic rod (24) is fixedly connected between the bottom of the inner wall of the U-shaped frame (21) and the lifting block (22). The support component (5) includes an arch block (51) fixed between the other ends of the three groups of sliding rods (3), and a contracted arched protective belt (52) is fixedly connected between the arch block (51) and the arch frame (1). The protective component (6) includes a protective mesh plate (61) for protecting the tunnel face, and the drive component (7) includes a first hydraulic telescopic rod (71) for longitudinally driving one of the drive plates (4).

2. The active support structure for preventing collapse of a large-section tunnel in jointed rock mass according to claim 1, characterized in that: Both sides of the bottom of the arch block (51) are fixedly connected to a collection block (53) for collecting stones to the middle, and the inner side surfaces of the two collection blocks (53) are both set as arc surfaces. One side of the arch block (51) is fixedly connected to a conical puncture strip (54).

3. The active support structure for preventing collapse of a large-section tunnel in jointed rock mass according to claim 1, characterized in that: The protection assembly (6) comprises a first connecting frame (62) fixed on a group of sliding rods (3) located above, and the top of the protection mesh plate (61) is connected to the bottom of the first connecting frame (62).

4. The active support structure for preventing collapse of a large-section tunnel in jointed rock mass according to claim 3 is characterized by: The top of the protective mesh plate (61) is hinged to the bottom of the first connecting frame (62), and the outer surface of the group of sliding rods (3) is fixedly connected to a second connecting frame (63), the second connecting frame (63) is located on one side of the first connecting frame (62), and the bottom of the second connecting frame (63) is hinged to an inclined second hydraulic telescopic rod (64), and the bottom end of the second hydraulic telescopic rod (64) is hinged to the inner side surface of the protective mesh plate (61).

5. The active support structure for preventing collapse of a large-section tunnel in jointed rock mass according to claim 1 is characterized in that: A sliding block (72) is fixedly connected to the bottom of one side of the arch frame (1), a second bolt fastener is fixedly installed on one side of the bottom of the sliding block (72), a movable plate (73) is provided on the top of the sliding block (72), and a first hydraulic telescopic rod (71) is fixed inside the movable plate (73), and the telescopic end of the first hydraulic telescopic rod (71) is fixedly connected to the driving plate (4) located on the side.

6. The active support structure for preventing collapse of a large-section tunnel in jointed rock mass according to claim 5, characterized in that: The movable plate (73) is slidably connected to the bottom of the sliding block (72), a groove is provided on the top of the sliding block (72), and a group of locking blocks (74) are fixedly connected inside the groove. A locking assembly (8) is provided on one side of the movable plate (73), and the locking assembly (8) includes a T-shaped limit block (81) slidably connected to one side of the movable plate (73), and the bottom of the T-shaped limit block (81) is used to be inserted between two adjacent locking blocks (74) to form a locking between the movable plate (73) and the sliding block (72).

7. The active support structure for preventing collapse of a large-section tunnel in jointed rock mass according to claim 6, characterized in that: The tops of a group of locking blocks (74) are all configured as inclined surfaces, and one side of the bottom of the T-shaped limiting block (81) is configured as an inclined surface.

8. The active support structure for preventing collapse of a large-section tunnel in jointed rock mass according to claim 7, characterized in that: The top of one side of the T-shaped limit block (81) is fixedly connected to a support plate (82), and one side of the movable plate (73) is fixedly connected to two springs (83) through the support plate (82). The bottom ends of the two springs (83) are fixed to the top of the T-shaped limit block (81). A movable hole is opened inside the support plate (82), and a U-shaped operating rod (84) is inserted into the movable hole. One end of the U-shaped operating rod (84) is rotatably connected to the top of the T-shaped limit block (81).

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