Adjustable grid steel frame tunnel surrounding rock support linkage device and distance adjusting method

Abstract

The invention relates to the technical field of tunnel engineering supporting, in particular to an adjustable grid steel frame tunnel surrounding rock supporting linkage device and a distance adjusting method.The adjustable grid steel frame tunnel surrounding rock supporting linkage device comprises a front vertical main reinforcement and a rear vertical connecting main reinforcement, and the adjustable grid steel frame tunnel surrounding rock supporting linkage device comprises the front vertical main reinforcement, the rear vertical connecting main reinforcement, a transmission system and a stirrup assembly; wherein the transmission system comprises a movable groove formed in the front vertical main rib and the rear vertical main rib, the movable groove is divided into an upper layer and a lower layer, the lower layer is a driving assembly and comprises a built-in seat, a bidirectional motor is fixedly installed in the built-in seat, the upper layer is a transmission assembly and comprises a driving gear arranged in the middle, and the transmission assembly comprises a transmission gear arranged in the middle. A front rack in meshed connection is arranged at the front end of the driving gear, and a rear rack in meshed connection is arranged at the rear end of the driving gear; the stirrup assembly comprises a right stirrup and a left stirrup, the right stirrup and the left stirrup are symmetrically arranged on the two sides of the axis of the movable groove, the right stirrup is fixedly connected with the rear rack, and the left stirrup is fixedly connected with the front rack.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of tunnel engineering support, in particular to an adjustable grating steel frame tunnel surrounding rock support linkage device and spacing adjustment method. BACKGROUND

[0002] In tunnel engineering construction, the stability of tunnel surrounding rock is crucial. As a commonly used tunnel support structure, the grating steel frame, for example, the authorized Chinese patent "iron filings distribution device for fastener machining" with application number CN223330588U, a tunnel composite lining grating steel frame structure, comprising a plurality of first segments and two second segments, a plurality of arc-shaped first segments are connected end to end in sequence through first joints to form an arch structure, the two second segments are symmetrically arranged, and the upper ends of the two second segments are connected through first joints and the two ends of the arch structure, and the lower ends of the two second segments are connected with second joints; wherein, the central angle of the first segment is 30°; the second segment is composed of an arc segment and a straight line segment, wherein the upper end of the arc segment is connected with the first joint, and the lower end of the arc segment is connected with the second joint through the straight line segment.

[0003] However, the existing grating steel frame has the problems of inconvenient adjustment, difficulty in accurately adapting to different tunnel sizes, limited support effect, etc., and cannot meet the complex and variable tunnel construction requirements. In the support process, there may be difficulties in installation, insufficient support strength or excessive support, etc., which increases the construction cost and safety risk.

[0004] In view of the above situation, in order to overcome the above technical problems, the application designs an adjustable grating steel frame tunnel surrounding rock support linkage device and spacing adjustment method, which solves the above technical problems. SUMMARY

[0005] In order to solve the above problems, the application provides an adjustable grating steel frame tunnel surrounding rock support linkage device to solve the problems of traditional grating steel frame that is difficult to adapt to different tunnel sizes and inconvenient to adjust.

[0006] The adjustable grating steel frame tunnel surrounding rock support linkage device comprises a front vertical main reinforcement and a rear vertical connecting main reinforcement, and comprises a front vertical main reinforcement, a rear vertical connecting main reinforcement, a transmission system and a stirrup assembly, wherein:

[0007] The transmission system comprises a movable groove arranged inside the front vertical main reinforcement and the rear vertical connecting main reinforcement, and the movable groove of the rear vertical connecting main reinforcement is provided with a plurality of movable grooves, the movable grooves are divided into two layers, the lower layer is a driving assembly comprising an embedded seat, a bidirectional motor is fixedly installed inside the embedded seat, the upper layer is a transmission assembly comprising a driving gear arranged at the middle position, a front rack is arranged at the front end of the driving gear in meshing connection, and a rear rack is arranged at the rear end of the driving gear in meshing connection;

[0008] The hoop assembly comprises right and left hoops symmetrically arranged on both sides of the movable slot axis and slidingly limited by the movable slot, the right hoop is fixedly connected with the rear rack, and the left hoop is fixedly connected with the front rack.

[0009] Preferably, the right hoop comprises a right front hoop and a right increased connection rear hoop, and the left hoop comprises a left front hoop and a left increased connection rear hoop, one end of the right front hoop is fixed with the rear rack in the front vertical main bar, one end of the left front hoop is fixed with the front rack in the front vertical main bar, one end of the right increased connection rear hoop is fixed with the rear rack in the rear vertical connection main bar, and one end of the left increased connection rear hoop is fixed with the front rack in the rear vertical connection main bar.

[0010] Preferably, one side of the driving gear is provided with a right auxiliary gear, the shaft of the right auxiliary gear is rotationally connected with the built-in seat, the other side of the driving gear is provided with a left auxiliary gear, the shaft of the left auxiliary gear is rotationally connected with the built-in seat, and the left and right auxiliary gears are meshingly connected with the rear rack and the front rack.

[0011] Preferably, the front vertical main bar is provided with an inner groove on one side close to the rear vertical connection main bar, the inner groove is provided with a matching connecting movable block, the connecting movable block is provided with a fixed bar and a threaded bar, the threaded bar is connected with the output end of a matching DC motor, the fixed bar is slidingly connected with the connecting movable block, the other end of the fixed bar is fixed with the rear vertical connection main bar, and the connecting movable block is threadedly connected with the threaded bar.

[0012] Preferably, the right and left increased connection rear hoops are provided with connecting sleeve bars, the connecting sleeve bars are provided with matching adjusting movable connecting clamping bars, and the connecting clamping bars are connected on the right and left front hoops.

[0013] Preferably, the top of the front vertical main bar and the rear vertical connection main bar is provided with a connected top cover fixed adjusting bar plate, the bottom of the top cover fixed adjusting bar plate is provided with a plurality of mounted movable clamping blocks, the movable clamping blocks are provided with matching movable clamping grooves, and the movable clamping grooves are arranged at the top edges of the corresponding front vertical main bars and rear vertical connection main bars.

[0014] Preferably, the inner sides of the right front hoop, the left front hoop, the right increased connection rear hoop and the left increased connection rear hoop are provided with clamping frames, and when the right and left hoops are unfolded, the clamping frames are attached to the side surfaces of the front vertical main bars or the rear vertical connection main bars.

[0015] Preferably, the top ends of the right and left hoops are connected with top hoops, the top hoops have an arc structure, and the top hoops wrap the upper parts of the front vertical main bars or the rear vertical connection main bars.

[0016] Preferably, a top auxiliary stirrup is arranged between the front and rear top stirrups, and the top auxiliary stirrup is fixedly connected with the side edge of the rear vertical connection main stirrup.

[0017] The interval adjusting method of the adjustable lattice steel frame tunnel surrounding rock supporting linkage device comprises the following steps:

[0018] Step one, according to the cross-sectional shape of the tunnel, the interval adjusting distance of the right stirrup and the left stirrup is determined;

[0019] Step two, the built-in bidirectional motor is started, and the output shaft drives the driving gear to rotate; since the driving gear is meshed and connected with the front rack, the rotating movement of the driving gear is converted into the linear movement of the front rack through the meshing of the gear and the rack, and the left stirrup fixedly connected with the front rack is displaced along the axis of the movable groove under the driving of the rack;

[0020] Step three, the driving gear is meshed and connected with the rear rack, and since the tooth direction of the front rack and the rear rack is opposite, the rotation of the driving gear drives the rear rack to move linearly in the opposite direction of the front rack; the right stirrup fixedly connected with the rear rack moves synchronously in the opposite direction of the displacement of the left stirrup under the driving of the rack, and the size adjustment of the stirrup assembly according to the cross-sectional shape of the tunnel is completed.

[0021] The beneficial effects of the present application are as follows:

[0022] 1. The present application realizes flexible size adjustment of the right front stirrup, the left front stirrup, the right rear stirrup and the left rear stirrup through the cooperation of the gear and rack transmission system, the left auxiliary gear, the right auxiliary gear, the rear rack, the front rack and the bidirectional motor, can closely fit different tunnel cross-sectional shapes, significantly enhances the supporting stability of the tunnel surrounding rock compared with the existing supporting structure which is difficult to adjust the size, and reduces the risk of surrounding rock collapse.

[0023] 2. The connecting movable block of the present application is threadedly connected with the threaded column, and the connecting movable block slides along the fixed column under the driving of the threaded column, the fixed column is slidingly connected with the connecting movable block, and the connecting movable block is located in the inner groove on the side adjacent to the front vertical main stirrup and the rear vertical connection main stirrup, thereby realizing accurate length adjustment of the front vertical main stirrup and the rear vertical connection main stirrup, flexibly adapting to different tunnel length requirements, avoiding installation problems caused by size mismatch compared with the traditional fixed length lattice steel frame, and greatly improving the construction efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description, and obviously, other drawings can also be obtained by those skilled in the art without creative labor.

[0025] Figure 1 is a front perspective view of the present application;

[0026] Figure 2 is a split display schematic diagram of the front vertical main reinforcement and the rear vertical connecting main reinforcement structure;

[0027] Figure 3 is a display schematic diagram of the structure on the front vertical main reinforcement;

[0028] Figure 4 is a schematic diagram of the stirrup transmission structure;

[0029] Figure 5 is Figure 4 is a local enlarged view of area A in the middle;

[0030] Figure 6 is a schematic diagram of the structure in the expanded state of the stirrup;

[0031] Figure 7 is a rear side perspective view;

[0032] Figure 8 is a front side perspective view.

[0033] In the figure:

[0034] 1, front vertical main reinforcement; 2, rear vertical connecting main reinforcement; 3, inner groove; 4, right front stirrup; 5, left front stirrup; 6, movable groove; 7, clamping frame; 8, built-in seat; 9, bidirectional motor; 10, driving gear; 11, left auxiliary gear; 12, right auxiliary gear; 13, rear rack; 14, front rack; 15, top stirrup; 16, top cover fixed tuning rib plate; 17, movable clamping block; 18, movable clamping groove; 19, connecting movable block; 20, fixed rib column; 21, threaded rib column; 22, DC motor; 23, connecting sleeve rib; 24, connecting clamping rib; 25, top auxiliary stirrup; 26, right auxiliary connecting rear stirrup; 27, left auxiliary connecting rear stirrup. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical scheme and advantages of the present application more clear and obvious, the present application will be further described in detail below in combination with embodiments. It should be understood that the specific embodiments described here are only used to explain the present application and do not limit the present application.

[0036] The application principle of the present application will be further described below in combination with the drawings and specific embodiments.

[0037] Example 1:

[0038] As Figures 1-8As shown, the adjustable grating steel frame tunnel surrounding rock support linkage device comprises a front vertical main reinforcement 1, a rear vertical connecting main reinforcement 2, a transmission system and a hoop assembly, and each component cooperates to realize support size adjustment and surrounding rock support function, wherein:

[0039] The front vertical main reinforcement 1 and the rear vertical connecting main reinforcement 2 are the load-bearing framework of the device, are arranged horizontally, are arranged in parallel and have an adjustable spacing. An inner groove 3 is formed on one side of the front vertical main reinforcement 1 close to the rear vertical connecting main reinforcement 2, and an adapted connecting movable block 19 is assembled in the inner groove 3, and the connecting movable block 19 is used to realize the movable connection and relative position adjustment of the front vertical main reinforcement 1 and the rear vertical connecting main reinforcement 2.

[0040] The transmission system is a power transmission mechanism for adjustment function, is integrally arranged in the interiors of the front vertical main reinforcement 1 and the rear vertical connecting main reinforcement 2, and has a movable groove 6 formed in the interiors of the front vertical main reinforcement 1 and the rear vertical connecting main reinforcement 2. The movable groove 6 on the rear vertical connecting main reinforcement 2 has a plurality of movable grooves 6, which are uniformly distributed in the vertical direction. Each movable groove 6 is divided into two layers, the lower layer is a driving assembly, and the upper layer is a transmission assembly, which realizes the generation and transmission of power.

[0041] Specifically, the driving assembly comprises an inner seat 8 and a bidirectional motor 9. The inner seat 8 is fixedly installed at a preset installation position of the lower layer of the movable groove 6, has a motor fixing structure in the interior, and the bidirectional motor 9 is fixedly installed in the inner seat 8 through the structure. The output shaft of the bidirectional motor 9 extends upward to the transmission assembly in the upper layer for providing rotary power. According to the actual support strength requirement, the bidirectional motor 9 with an appropriate power can be selected, and the coaxiality of the output shaft and the transmission assembly needs to be ensured during motor installation to avoid power transmission deviation.

[0042] The transmission assembly comprises a driving gear 10, a front rack 14 and a rear rack 13. The driving gear 10 is arranged at the middle position of the upper layer of the movable groove 6, the center shaft thereof is fixedly connected with the output shaft of the bidirectional motor 9, and the bidirectional motor 9 can directly drive the driving gear 10 to rotate after being started. The front rack 14 is arranged at the front end of the driving gear 10, the rear rack 13 is arranged at the rear end of the driving gear 10, both are meshingly connected with the driving gear 10, and the tooth direction of the front rack 14 and the rear rack 13 is opposite, so as to ensure that the front rack 14 and the rear rack 13 move in the opposite direction in a straight line when the driving gear 10 rotates.

[0043] The hoop assembly is a support structure directly contacting the tunnel surrounding rock, is used to fit the surrounding rock and transmit the support force, comprises a right hoop and a left hoop, both are symmetrically arranged on both sides of the axis of the movable groove 6 and are in sliding limiting cooperation with the movable groove 6. The right hoop is fixedly connected with the rear rack 13, the left hoop is fixedly connected with the front rack 14, the hoop is driven to move synchronously through the straight line motion of the rack, and the spacing adjustment is realized.

[0044] Specifically, the right stirrup and the left stirrup are both in a segmented structure, which is adapted to the spacing adjustment requirement of the front vertical main reinforcement 1 and the rear vertical connecting main reinforcement 2. The right stirrup includes a right front stirrup 4 and a right increased connecting rear stirrup 26. One end of the right front stirrup 4 is fixed with the rear rack 13 in the front vertical main reinforcement 1 by welding or bolt, and one end of the right increased connecting rear stirrup 26 is fixed with the rear rack 13 in the rear vertical connecting main reinforcement 2 by the same way. The left stirrup includes a left front stirrup 5 and a left increased connecting rear stirrup 27. One end of the left front stirrup 5 is fixed with the front rack 14 in the front vertical main reinforcement 1, and one end of the left increased connecting rear stirrup 27 is fixed with the front rack 14 in the rear vertical connecting main reinforcement 2.

[0045] As shown in Figure 3 and Figure 4 , a fixed column 20 and a threaded column 21 are arranged in the connecting movable block 19. The threaded column 21 is fixedly connected with the output end of an adapted DC motor 22 through a shaft coupling, and the DC motor 22 is fixedly installed on a preset mounting seat of the rear vertical connecting main reinforcement 2. The fixed column 20 is slidingly connected with the connecting movable block 19. The connecting movable block 19 is provided with an adapted sliding hole, the fixed column 20 passes through the sliding hole, and the other end of the fixed column 20 is fixedly connected with the rear vertical connecting main reinforcement 2. The connecting movable block 19 is provided with an inner threaded hole adapted to the threaded column 21, and the two are connected through threads. The threaded column 21 is driven to rotate by the DC motor 22, which can drive the connecting movable block 19 to slide along the fixed column 20, thereby adjusting the relative spacing of the front vertical main reinforcement 1 and the rear vertical connecting main reinforcement 2.

[0046] Embodiment 2:

[0047] The spacing adjustment method of the adjustable grating steel frame tunnel surrounding rock support linkage device includes the following steps:

[0048] Step one, first measure the actual cross-sectional shape and size of the tunnel, calculate the required spacing adjustment distance of the right stirrup and the left stirrup according to the measurement data, and determine the rotation direction and rotation angle of the bidirectional motor 9. In this step, the measurement tools can use conventional measurement equipment such as laser range finder and tape measure. When calculating, a certain safety margin, usually 5-10 cm, needs to be reserved to ensure that the stirrup is closely attached to the surrounding rock;

[0049] Step two: according to the parameters determined in step one, start the bidirectional motor 9 in each movable slot 6 in the front vertical main reinforcement 1 and the rear vertical connecting main reinforcement 2. After the bidirectional motor 9 is started, the output shaft drives the driving gear 10 to rotate. Since the driving gear 10 is meshed with the front rack 14, the rotational movement of the driving gear 10 is converted into the linear movement of the front rack 14 through the gear and rack meshing. The left stirrup fixedly connected with the front rack 14 is displaced along the axis direction of the movable slot 6 under the driving of the rack;

[0050] Step three: synchronous drive right stirrup reverse displacement, complete adjustment in the main gear 10 drive front rack 14 movement, the main gear 10 and the rear rack 13 meshing connection, because the front rack 14 and the rear rack 13 tooth direction is opposite, the rotation of the main gear 10 will drive the rear rack 13 along the opposite direction of the front rack 14 linear motion; With the right stirrup fixed connection of the rear rack 13, under the drive of the rack, the right stirrup moves to the left of the displacement of the synchronous movement in the opposite direction;

[0051] When the left and right stirrup moves to the preset position by motor travel switch or position sensor feedback signal control motor stop, the adjustment is completed. At this time, the spacing of the stirrup assembly is adapted to the size of the tunnel section, and the clamping frame 7 is closely attached to the side of the vertical main reinforcement, ensuring the stability of the stirrup; If you need to adjust the front and rear spacing, you can start the DC motor 22, drive the connecting block 19 to slide through the threaded column 21, adjust the spacing of the front vertical main reinforcement 1 and the rear vertical main reinforcement 2, and at the same time, the connecting stirrup 24 slides in the connecting sleeve stirrup 23 to adapt, ensuring the continuity of the stirrup assembly; The top stirrup 15 and the top auxiliary stirrup 25 are attached to the top surrounding rock to form a complete supporting structure.

[0052] Example 3:

[0053] As shown in Figure 4 and Figure 5 , on the basis of example 1, in order to improve the stability of transmission, right auxiliary gear 12 is arranged on one side of the main gear 10, and left auxiliary gear 11 is arranged on the other side; The shaft of the right auxiliary gear 12 and the left auxiliary gear 11 is rotatably connected with the built-in seat 8 through the bearing, and the left auxiliary gear 11 and the right auxiliary gear 12 are meshingly connected with the rear rack 13 and the front rack 14. The arrangement of the auxiliary gear can avoid the deviation of the rack in the linear motion, and ensure the stability and adjustment accuracy of the transmission.

[0054] Example 4:

[0055] As shown in Figure 2 and Figure 3 , on the basis of example 1, in order to enhance the integrity and supporting strength of the stirrup assembly, connecting sleeve stirrup 23 is arranged on the right increased rear stirrup 26 and the left increased rear stirrup 27, and the connecting sleeve stirrup 23 is a hollow tubular structure, which is internally fitted with an adaptive connecting clamp 24. The connecting clamp 24 can slide in the connecting sleeve stirrup 23 along the axial direction, and the other end of the connecting clamp 24 is connected to the right front stirrup 4 and the left front stirrup 5 respectively. Through the sliding fit of the connecting sleeve stirrup 23 and the connecting clamp 24, the length of the right increased rear stirrup 26, the left increased rear stirrup 27, the right front stirrup 4 and the left front stirrup 5 can be adapted, ensuring that the stirrup assembly always maintains a continuous supporting structure during the adjustment process.

[0056] Example 5:

[0057] As Figure 6 shown, on the basis of example 1, the inner side of the right front stirrup 4, the left front stirrup 5, the right increased connection rear stirrup 26 and the left increased connection rear stirrup 27 are provided with a card frame 7, which is an arc-shaped metal plate structure, and the arc of the card frame 7 is matched with the arc of the outer wall of the front vertical main reinforcement 1 and the rear vertical connection main reinforcement 2. When the right stirrup and the left stirrup are unfolded and adjusted to the preset position, the card frame 7 is closely attached to the side of the front vertical main reinforcement 1 or the rear vertical connection main reinforcement 2, and the movement of the stirrup in the non-adjusting direction such as the upward and downward direction and the rotating direction is limited by the friction force, thereby playing a positioning and stabilizing role; at the same time, in the adjusting process, the card frame 7 can slide along the side of the main reinforcement, guide the stirrup to move along the predetermined direction, and avoid deviation.

[0058] Example 6:

[0059] As Figure 2 shown, on the basis of example 1, the top end of the right stirrup and the left stirrup is connected with a top stirrup 15, and the top stirrup 15 is in an arc-shaped structure, and the arc of the top stirrup 15 is matched with the arc of the surrounding rock at the top of the tunnel, and the top stirrup 15 is wrapped around the upper part of the front vertical main reinforcement 1 or the rear vertical connection main reinforcement 2, thereby realizing the support of the top of the tunnel. In order to enhance the carrying capacity of the top, a top increased auxiliary stirrup 25 is arranged between the front and rear top stirrups 15, and the top increased auxiliary stirrup 25 is an arc-shaped or straight metal reinforcement, one end of which is fixedly connected with the side of the rear vertical connection main reinforcement 2, and the other end is connected with the top stirrup 15 on the front side, thereby assisting the top stirrup 15 to share the surrounding rock pressure.

Claims

1. An adjustable grid steel frame tunnel surrounding rock support linkage device, comprising a front vertical main reinforcement (1) and a rear vertical connecting main reinforcement (2), characterized in that: Includes front vertical main reinforcement (1), rear vertical connecting main reinforcement (2), transmission system and stirrup assembly, wherein: The transmission system includes movable slots (6) set inside the front vertical main rib (1) and the rear vertical connecting main rib (2), and the movable slots (6) of the rear vertical connecting main rib (2) are provided in multiple ways. The movable slots (6) are divided into upper and lower layers. The lower layer is a drive component, including an inner seat (8). A bidirectional motor (9) is fixedly installed inside the inner seat (8). The upper layer is a transmission component, including a drive gear (10) set in the middle position. The front end of the drive gear (10) is provided with a front rack (14) meshing with it, and the rear end of the drive gear (10) is provided with a rear rack (13) meshing with it. The stirrup assembly includes a right stirrup and a left stirrup. The right stirrup and the left stirrup are symmetrically arranged on both sides of the axis of the movable groove (6), and the right stirrup and the left stirrup are slidably limited with the movable groove (6). The right stirrup is fixedly connected to the rear rack (13), and the left stirrup is fixedly connected to the front rack (14).

2. The adjustable grid steel frame tunnel surrounding rock support linkage device according to claim 1, characterized in that: The right stirrup includes a right front stirrup (4) and a right additional connecting rear stirrup (26). The left stirrup includes a left front stirrup (5) and a left additional connecting rear stirrup (27). One end of the right front stirrup (4) is fixed to the rear toothed bar (13) in the front vertical main bar (1). One end of the left front stirrup (5) is fixed to the front toothed bar (14) in the front vertical main bar (1). One end of the right additional connecting rear stirrup (26) is fixed to the rear toothed bar (13) in the rear vertical main bar (2). One end of the left additional connecting rear stirrup (27) is fixed to the front toothed bar (14) in the rear vertical main bar (2).

3. The adjustable grid steel frame tunnel surrounding rock support linkage device according to claim 1, characterized in that: A right auxiliary gear (12) is provided on one side of the active gear (10), and the shaft of the right auxiliary gear (12) is rotatably connected to the inner seat (8). A left auxiliary gear (11) is provided on the other side of the active gear (10), and the shaft of the left auxiliary gear (11) is rotatably connected to the inner seat (8). Both the left auxiliary gear (11) and the right auxiliary gear (12) are meshed with the rear rack (13) and the front rack (14).

4. The adjustable grid steel frame tunnel surrounding rock support linkage device according to claim 1, characterized in that: The front vertical main bar (1) has an inner groove (3) on one side near the rear vertical connecting main bar (2). The inner groove (3) has a matching connecting movable block (19). The connecting movable block (19) has a fixed rib column (20) and a threaded rib column (21). The threaded rib column (21) is connected to the output end of the matching DC motor (22). The fixed rib column (20) is slidably connected to the connecting movable block (19), and the other end of the fixed rib column (20) is fixed to the rear vertical connecting main bar (2). The connecting movable block (19) is threadedly connected to the threaded rib column (21).

5. The adjustable grid steel frame tunnel surrounding rock support linkage device according to claim 2, characterized in that: The right-side additional connecting stirrup (26) and the left-side additional connecting stirrup (27) are provided with connecting sleeves (23), and the connecting sleeves (23) have connecting clamps (24) adapted to adjust and move. The connecting clamps (24) are connected to the right front stirrup (4) and the left front stirrup (5).

6. The adjustable grid steel frame tunnel surrounding rock support linkage device according to claim 2, characterized in that: The top of the front vertical main bar (1) and the rear vertical connecting main bar (2) are connected by a top cover fixing plate (16). The bottom of the top cover fixing plate (16) has multiple movable blocks (17). The movable blocks (17) have movable slots (18) adapted to move. The movable slots (18) are set at the top edge of the corresponding front vertical main bar (1) and rear vertical connecting main bar (2).

7. The adjustable grid steel frame tunnel surrounding rock support linkage device according to claim 2, characterized in that: The inner sides of the right front stirrup (4), left front stirrup (5), right additional connecting stirrup (26) and left additional connecting stirrup (27) are all provided with brackets (7). When the right stirrup and left stirrup are unfolded, the brackets (7) are attached to the side of the front vertical main bar (1) or the rear vertical connecting main bar (2).

8. The adjustable grid steel frame tunnel surrounding rock support linkage device according to claim 1, characterized in that: The top of both the right and left stirrups is connected to a top stirrup (15). The top stirrup (15) has an arc-shaped structure and wraps around the upper part of the front vertical main bar (1) or the rear vertical connecting main bar (2).

9. The adjustable grid steel frame tunnel surrounding rock support linkage device according to claim 8, characterized in that: A top auxiliary stirrup (25) is provided between the front and rear top stirrups (15), and the top auxiliary stirrup (25) is fixedly connected to the side of the rear vertical connecting main bar (2).

10. A method for adjusting the spacing of the adjustable grid steel frame tunnel surrounding rock support linkage device according to any one of claims 1-9, characterized in that, Includes the following steps: Step 1: Determine the spacing adjustment distance between the right and left stirrups based on the cross-sectional shape of the tunnel; Step 2: Start the bidirectional motor (9) in the built-in seat (8) and drive the drive gear (10) to rotate. Since the drive gear (10) is meshed with the front rack (14), the rotational motion of the drive gear (10) is converted into the linear motion of the front rack (14) through the meshing of the gear and rack. The left hoop fixedly connected to the front rack (14) is displaced and adjusted along the axis of the movable groove (6) under the drive of the rack. Step 3: Simultaneously, the drive gear (10) meshes with the rear rack (13). Since the front rack (14) and the rear rack (13) have opposite tooth directions, the rotation of the drive gear (10) will drive the rear rack (13) to move in a straight line in the opposite direction to the front rack (14). The right stirrup, which is fixedly connected to the rear rack (13), moves synchronously in the opposite direction to the displacement of the left stirrup under the drive of the rack, thus completing the size adjustment of the stirrup assembly according to the shape of the tunnel cross section.

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