A hard surrounding rock tunnel deformation control supporting device

Abstract

The application discloses a hard surrounding rock tunnel deformation control supporting device, and relates to the technical field of tunnel supporting devices.The device comprises a steel arch, a foot anchor rod, an extension assembly, a locking assembly and an adjusting assembly.The extension assembly is rotationally connected with the foot of the steel arch, and after being unfolded, the extension assembly, a hinged plate and a supporting rod and the foot of the steel arch form a triangular supporting structure, so that the contact area of the bottom of the steel arch with the tunnel bottom surface is increased, and the load bearing and subsidence resistance are improved.The locking assembly comprises a fixing sleeve and a locking nut, the foot anchor rod is embedded into the tunnel through the fixing sleeve, and the locking nut is tightened, so that the device is quickly fixed without welding.The adjusting assembly is composed of a rotating ring sleeve and a clamping seat and a clasp matched with each other, and during the locking process, the position of the foot of the steel arch can be adjusted by pushing and pulling through the forward and reverse rotation of the locking nut, so that the steel arch can be quickly and accurately aligned.The application solves the problems of the prior art, such as the small contact area of the bottom of the steel arch, the easy sinking and deviation, the complicated welding fixing construction and the difficulty in quickly adjusting and aligning the position of the foot.

Description

Technical Field

[0001] This invention relates to the field of tunnel support device technology, specifically a deformation control support device for tunnels in hard surrounding rock. Background Technology

[0002] In the construction of tunnels in hard surrounding rock, it is usually necessary to erect steel arches inside the tunnel, and combine them with shotcrete, steel mesh, and foot anchors to form an initial support system to improve the stability of the surrounding rock. Among them, the steel arches are mainly used to bear the pressure of the surrounding rock and maintain the stability of the tunnel cross section, and are one of the important structures in tunnel support construction.

[0003] In current construction practices, the bottom of the steel arch frame is typically fixed to the foot anchor bolts by welding to limit its subsidence or displacement under the pressure of the surrounding rock, thereby improving the overall stability of the support structure. However, in actual construction, due to the presence of gravel and debris at the bottom of the tunnel, the contact state between the bottom of the steel arch frame and the ground is often unstable. Traditional steel arch frames have a small contact area at the bottom, making them prone to localized subsidence or sinking under the continuous pressure of the surrounding rock above. This can lead to displacement of the bottom of the steel arch frame, affecting the overall stress stability of the support structure.

[0004] Meanwhile, because the bottom of the steel arch frame needs to be welded and fixed to the foot anchor rods, and the bottom position of the steel arch frame usually has a certain installation deviation after it is erected on site, it is difficult for the bottoms of adjacent groups of steel arch frames to be naturally kept on the same baseline. In order to ensure that the subsequent support structure is laid out neatly and the stress is even, the construction personnel often need to manually correct the position of the bottom of the steel arch frame repeatedly before welding and fixing, so that the bottom ends of each group of steel arch frames are as aligned as possible. In this adjustment process, the bottom ends of the steel arch frame need to be moved frequently for position correction, which is a rather cumbersome construction operation. At the same time, in the narrow tunnel construction environment, on-site welding operations also have the problems of inconvenience and low fixing efficiency, thus affecting the overall support construction efficiency.

[0005] Therefore, how to provide a deformation control support device for hard rock tunnels that can improve the stability of the bottom support of the steel arch frame, facilitate the quick fixing of the steel arch frame and the foot anchor rods, and adjust the position of the bottom of the steel arch frame so as to facilitate the quick alignment of the bottom of each group of steel arch frames has become a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0006] The purpose of this invention is to provide a deformation control support device for tunnels in hard surrounding rock, in order to solve the problems in the prior art where the bottom of the steel arch frame has a small contact area with the ground, making it prone to local subsidence and positional displacement under the pressure of the surrounding rock. At the same time, the construction of fixing the steel arch frame and the foot anchor rod by welding is cumbersome, and the bottom position of the steel arch frame is difficult to adjust and align quickly after installation.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a deformation control support device for a hard surrounding rock tunnel, comprising a steel arch frame, foot anchors, an extension component, a locking component, and an adjustment component; the steel arch frame is located inside the tunnel, its outer arc surface abutting against the inner wall of the tunnel; the foot anchors are embedded inside the tunnel and located on both sides of the foot of the steel arch frame; the extension component and the foot anchors are located on both sides of the foot of the steel arch frame, and the extension component is rotatably connected to the foot of the steel arch frame; the extension component, when unfolded, forms a triangular support structure; the locking component is fixedly connected to the extension component; the adjustment component is rotatably connected to the locking component and located between the locking component and the anchors; the extension component extends to increase the contact area between the steel arch frame and the bottom of the tunnel; the foot anchors, after the extension component extends, pass through the locking component and embed into the tunnel; the adjustment component is used to adjust the position of the foot of the steel arch frame during the locking process of the locking component.

[0008] Preferably, the extension assembly includes a hinge plate, a strut, and a locking bolt; the hinge plate is located on both sides of the steel arch frame and is rotatably connected to the foot of the steel arch frame, one end of the strut is rotatably connected to the hinge plate, the locking bolt is installed through the steel arch frame, and the end of the strut abuts against the bottom of the locking bolt.

[0009] Preferably, the foot of the steel arch frame is also fixedly connected to a baffle, and an abutment groove is provided at the joint between the hinge plate and the steel arch frame. When the hinge plate is opened, both sides of the baffle are in the abutment groove, and at this time the bottom surface of the hinge plate and the bottom surface of the baffle are on the same plane.

[0010] Preferably, the distance from the connection end of the hinge plate to the steel arch frame to the inner wall of the steel arch frame groove is greater than the thickness of the strut.

[0011] Preferably, the inner wall of the steel channel of the steel arch frame is further fixedly connected with two sets of abutment blocks, and the distance between the two sets of abutment blocks is equal to the width of the support rod.

[0012] Preferably, the locking assembly includes a fixing sleeve, a push thread, and a locking nut; the fixing sleeve is fixedly connected to the support rod, the push thread is located near the outer end of the foot anchor rod, and the locking nut is threadedly connected to the push thread section on the foot anchor rod.

[0013] Preferably, the diameter of the outer end of the foot anchor is smaller than the diameter of the location of the push thread.

[0014] Preferably, the adjustment assembly includes a rotating ring sleeve, a retaining ring, a retaining seat, and a buckle; the rotating ring sleeve is rotatably connected to the inside of the fixed sleeve, the retaining ring is fixedly connected to both ends of the rotating ring sleeve, the fixed sleeve is located between the retaining rings, the retaining seat is fixedly connected to the side of the rotating ring sleeve near the locking nut, the retaining seat is symmetrically composed of two sets of right-angled rods, and multiple sets of retaining seats are arranged in a circular equidistant array on the outside of the rotating ring sleeve; the buckle is fixedly connected to the side of the locking nut facing the rotating ring sleeve, the buckle is arranged in a "T" shape and the number is the same as the retaining seat.

[0015] Preferably, the outer end of the card holder is rounded.

[0016] Preferably, a lever is also fixedly connected to the outer periphery of the retaining ring on the side away from the locking nut on the rotating ring sleeve.

[0017] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention, by incorporating deployable hinged plates and struts, forms a stable triangular support structure with the base of the steel arch frame. When deployed, the hinged plates, together with the baffles, create an enlarged continuous support surface, significantly increasing the contact area between the bottom of the steel arch frame and the tunnel floor. This effectively disperses the pressure from the surrounding rock above, preventing localized subsidence and sinking caused by uneven stress or bottom debris, thereby greatly improving the overall stability of the support structure. Simultaneously, the struts are multiple times restrained by side blocks and locking components, ensuring the geometric stability of the support structure and preventing lateral deviation.

[0018] 2. This invention eliminates the traditional on-site welding fixing method used in construction, achieving rapid mechanical connection through locking components. After the extension component is deployed, simply pass the foot anchor rod through the fixing sleeve on the support rod and drive it into the rock layer. Then, tighten the locking nut so that the "T"-shaped buckle on the nut engages with the locking seat of the adjustment component, thus completing the stable connection between the steel arch frame and the anchor rod. This process is simple and quick, avoiding the inconvenience and inefficiency of welding operations in narrow tunnels, and significantly improving fixing efficiency and construction safety.

[0019] 3. This invention integrates an adjustment assembly consisting of a rotating ring, a retaining seat, and a buckle. After the locking nut engages with the retaining seat, continuing to rotate the locking nut forward and backward allows for precise adjustment of the spatial position of the steel arch frame's feet via a push-pull mechanism: forward rotation pushes it towards the rock wall, while reverse rotation pulls it away. This design enables construction workers to easily and efficiently correct installation deviations, quickly aligning the bottom ends of adjacent steel arch frames to the same baseline, ensuring the neat arrangement of subsequent support structures and uniform overall stress distribution. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural diagram of the integrated body of the present invention; Figure 2 This is a schematic diagram of the steel arch frame foot position structure of the present invention; Figure 3 This is a three-dimensional structural diagram of the extension component of the present invention; Figure 4 This is a schematic diagram of the structure of the blocking block in this invention; Figure 5 This is a schematic diagram of the hinge plate and strut of the present invention in the retracted state with the steel arch frame; Figure 6 This is a schematic diagram of the locking component structure of the present invention; Figure 7 This is a schematic diagram of the adjustment component structure of the present invention; Figure 8 This is a cross-sectional view of the fixing sleeve of the present invention; Figure 9 This is a diagram showing the card holder and the buckle being fastened together according to the present invention.

[0021] In the diagram: 1. Steel arch frame; 2. Foot anchor bolt; 3. Extension assembly; 31. Hinge plate; 32. Support rod; 33. Snap bolt; 301. Baffle; 302. Abutment groove; 4. Abutment block; 5. Locking assembly; 51. Fixing sleeve; 52. Push thread; 53. Locking nut; 6. Adjustment assembly; 61. Rotating ring sleeve; 62. Snap ring; 63. Snap seat; 64. Snap buckle; 7. Lever. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] Please see Figures 1 to 9 This invention provides a deformation control support device for tunnels in hard surrounding rock, the technical solution of which is as follows: Reference Figure 1 and Figure 2A deformation control support device for a hard surrounding rock tunnel includes a steel arch frame 1, foot anchors 2, an extension component 3, a locking component 5, and an adjustment component 6. The steel arch frame 1 is located inside the tunnel, with its outer arc surface abutting against the inner wall of the tunnel. The foot anchors 2 are embedded inside the tunnel and located on both sides of the foot of the steel arch frame 1. The extension component 3 is located on both sides of the foot of the steel arch frame 1, and is rotatably connected to the foot of the steel arch frame 1. When the extension component 3 is extended, it forms a triangular support structure. The locking component 5 is fixedly connected to the extension component 3. The adjustment component 6 is rotatably connected to the locking component 5 and is located between the locking component 5 and the anchors. The extension component 3 extends to increase the contact area between the steel arch frame 1 and the bottom of the tunnel. After the extension component 3 is extended, the foot anchors 2 pass through the locking component 5 and are embedded in the tunnel. The adjustment component 6 is used to adjust the position of the foot of the steel arch frame 1 during the locking process of the locking component 5.

[0024] During construction, the steel arch frame 1 must first be assembled in a suitable position within the tunnel. Then, the extension components 3 on both sides of the foot of the steel arch frame 1 are opened. After opening, the foot anchor rods 2 are passed through the locking components 5 on the extension components 3, and then the anchor rods are driven into the tunnel rock. At this time, the extension components 3 will form a fixed triangular structure at the bottom of the steel arch frame 1, which can improve the load-bearing capacity of the foot of the steel arch frame 1 and effectively disperse the pressure of the surrounding rock above, preventing the steel arch frame 1 from tilting or settling due to uneven local stress. Furthermore, during the locking process of the locking components 5, the position of the foot of the steel arch frame 1 can be continuously adjusted by adjusting the components 6 to ensure that the foot position of each group of steel arch frames 1 is on a straight line. After the adjustment is completed, the fixation between the steel arch frame 1 and the anchor rods is completed.

[0025] Reference Figure 3 The extension component 3 includes a hinge plate 31, a support rod 32, and a locking bolt 33. The hinge plate 31 is located on both sides of the steel arch frame 1 and is rotatably connected to the feet of the steel arch frame 1. One end of the support rod 32 is rotatably connected to the hinge plate 31. The locking bolt 33 is installed through the steel arch frame 1, and the end of the support rod 32 abuts against the lower part of the locking bolt 33. Before the steel arch frame 1 is assembled and used, the hinge plate 31 is inside the steel channel of the steel arch frame 1. At this time, the support rod 32 is in contact with the inner wall of the steel channel, and a binding rope is provided on the outside of the hinge plate 31 to facilitate the transportation of the steel arch frame 1 before use. When the frame 1 is used in combination, after untying the binding rope, rotate the hinge plate 31 ninety degrees to make it perpendicular to the side wall of the steel arch frame 1. Then swing the support rod 32 so that its end abuts against the inner wall of the steel channel of the steel arch frame 1. Then pass the clamping bolt 33 through the steel arch frame 1 and tighten the bolt and nut. At this time, the end of the support rod 32 will be below the clamping bolt 33. At this time, a stable triangle will be formed between the hinge plate 31, the support rod 32 and the foot of the steel arch frame 1. The hinge plate 31 can effectively increase the contact area between the foot of the steel arch frame 1 and the bottom of the tunnel, thereby improving the load-bearing capacity of the steel arch frame 1.

[0026] Reference Figure 4The foot of the steel arch frame 1 is also fixedly connected to a baffle 301. A contact groove 302 is provided at the joint between the hinge plate 31 and the steel arch frame 1. After the hinge plate 31 is opened, both sides of the baffle 301 are in the contact groove 302, and at this time the bottom surface of the hinge plate 31 and the bottom surface of the baffle 301 are on the same plane. Thus, the hinge plate 31 and the baffle 301 together form a continuous support surface, which increases the contact area between the foot of the steel arch frame 1 and the bottom surface of the tunnel. This helps to reduce local subsidence and sinking caused by bottom debris and slag. The baffle 301 can limit the maximum swing angle of the hinge plate 31 to ninety degrees.

[0027] Reference Figure 5 The distance from the connection end of the hinge plate 31 to the inner wall of the steel channel of the steel arch frame 1 is greater than the thickness of the strut 32; thus, when the hinge plate 31 is folded up, the strut 32 can be close to the inner wall of the steel channel of the steel arch frame 1, and both the hinge plate 31 and the strut 32 are inside the steel channel, which facilitates transportation.

[0028] Reference Figure 4 The inner wall of the steel channel of the steel arch frame 1 is also fixedly connected with two sets of abutment blocks 4. The distance between the two sets of abutment blocks 4 is equal to the width of the support rod 32. When the support rod 32 abuts against the snap bolt 33, its two sides are limited by the abutment blocks 4, which can effectively prevent the support rod 32 from shifting laterally during the force process and ensure the geometric stability of the triangular support.

[0029] Reference Figure 6 The locking component 5 includes a fixing sleeve 51, a push thread 52, and a locking nut 53. The fixing sleeve 51 is fixedly connected to the support rod 32. The push thread 52 is located near the outer end of the foot anchor rod 2. The locking nut 53 is threadedly connected to the push thread 52 section on the foot anchor rod 2. When the extension component 3 is unfolded, the foot anchor rod 2 can be passed through the center of the fixing sleeve 51, and then the foot anchor rod 2 can be driven into the tunnel surrounding rock. Then, the locking nut 53 is tightened to the push thread 52 section of the foot anchor rod 2, thus fixing the steel arch frame 1 and the foot anchor rod 2. This method is different from the traditional welding method and can effectively improve the installation efficiency.

[0030] Reference Figure 6 The outer diameter of the foot anchor 2 is smaller than the diameter of the push thread 52, so that after the foot anchor 2 is driven into the tunnel rock, the locking nut 53 can pass smoothly through the end of the foot anchor 2 and be screwed into the push thread 52 to connect, preventing damage to the push thread 52 during the process of driving the foot anchor 2 into the rock.

[0031] Reference Figures 7 to 9The adjusting component 6 includes a rotating ring sleeve 61, a retaining ring 62, a retaining seat 63, and a buckle 64. The rotating ring sleeve 61 is rotatably connected to the inside of the fixed sleeve 51. The retaining ring 62 is fixedly connected to both ends of the rotating ring sleeve 61, and the fixed sleeve 51 is located between the retaining rings 62. The retaining seat 63 is fixedly connected to the side of the rotating ring sleeve 61 near the locking nut 53. The retaining seat 63 is composed of two sets of right-angled rods symmetrically arranged. Multiple sets of retaining seats 63 are arranged in a circular equidistant array on the outside of the rotating ring sleeve 61. The buckle 64 is fixedly connected to the side of the locking nut 53 facing the rotating ring sleeve 61 and is arranged in a "T" shape. The number of anchor rods is consistent with that of the card holder 63. When the foot anchor rod 2 passes through the center of the fixed sleeve 51, the foot anchor rod 2 will pass through the center of the rotating ring sleeve 61 because the rotating ring sleeve 61 is rotatably connected to the inside of the fixed sleeve 51. At this time, when the locking nut 53 is about to contact the side wall of the rotating ring sleeve 61 during the tightening process, the rotating ring sleeve 61 needs to be rotated first to align the center of the notch of the card holder 63 with the center of the buckle 64. Then, follow the rotation of the locking nut 53 and push it forward. At the same time, the rotating ring sleeve 61 should be rotated at the same speed for a short period of time so that the buckle 64 enters the card holder 63. Then the rotating ring sleeve can be released. 61. Continue rotating the locking nut 53. As the locking nut 53 continues to rotate, the buckle 64 abuts against the seat 63, causing the rotating ring 61 to rotate. The buckle 64 will also continue to penetrate deeper into the seat 63. After the buckle 64 and the seat 63 are in maximum contact, continue rotating the locking nut 53. This will push the foot of the steel arch frame 1 closer to the tunnel rock, thereby adjusting the position of the foot of the steel arch frame 1. If it is necessary to adjust the position of the foot of the steel arch frame 1 away from the rock, simply rotate the locking nut 53 in the opposite direction. During the reversal process, one end of the head of the buckle 64 will contact the seat 63. During the process of fastening at the right-angle interior corner and then continuing to reverse the locking nut 53, the locking nut 53 will rotate and drive the foot of the steel arch frame 1 to move away from the tunnel rock, thereby improving the convenience and efficiency of adjusting the position of the foot of the steel arch frame 1. At the same time, the foot anchor rod 2 can also restrict the support rod 32 by rotating the connection between the ring sleeve 61 and the fixing sleeve 51, preventing the steel arch frame 1 from swinging during the load-bearing process, further improving the stability between the support rod 32, the hinge plate 31 and the steel arch frame 1, and thus further ensuring the load-bearing capacity of the foot of the steel arch frame 1.

[0032] Reference Figure 8 The outer end of the card holder 63 is rounded to facilitate the smooth sliding of the buckle 64 into the card holder 63 when the locking nut 53 approaches the rotating ring sleeve 61.

[0033] Reference Figure 8 A lever 7 is also fixedly connected to the outer periphery of the retaining ring 62 on the side of the rotating ring 61 away from the locking nut 53, so that the construction personnel can manually rotate the rotating ring 61 during the alignment of the retaining seat 63 and the buckle 64.

[0034] Working principle: First, the extension component 3 is deployed and supported: After the steel arch frame 1 is erected in the tunnel, the binding ropes on the outside of the hinge plate 31 are released, and the hinge plate 31, which was originally tucked into the steel groove, is rotated outward by 90 degrees, making it perpendicular to the side wall of the steel arch frame 1. At this time, the baffle 301 is engaged in the abutment groove 302 of the hinge plate 31 on both sides, limiting the maximum swing angle of the hinge plate 31 to 90 degrees, and the bottom surface of the hinge plate 31 is flush with the bottom surface of the baffle 301, together forming an enlarged continuous support surface. Next, the swing strut 32 is swung so that its end abuts against the inner wall of the steel groove of the steel arch frame 1, and then the clamping bolt 33 is installed on the steel arch frame 1, so that the end of the strut 32 is pressed under the clamping bolt 33. The abutment blocks 4 on both sides of the strut 32 can limit the strut 32 and prevent lateral deviation. At this point, the hinge plate 31, the strut 32 and the foot of the steel arch frame 1 form a stable triangular support structure, which significantly increases the contact area between the bottom of the steel arch frame 1 and the bottom of the tunnel, and improves the resistance to pressure and subsidence. Then, the foot anchor rod 2 is driven in and initial locking is completed: After the extension component 3 is unfolded, the foot anchor rod 2 is passed through the center hole of the fixing sleeve 51 (and the internal rotating ring sleeve 61) welded to the support rod 32 and driven into the tunnel surrounding rock. The outer diameter of the foot anchor rod 2 is small, which can protect the pushing thread 52 on it from being damaged during driving. After the anchor rod is in place, the locking nut 53 is rotated to push it towards the fixing sleeve 51 along the pushing thread 52 section on the foot anchor rod 2. When the locking nut 53 is about to contact the rotating ring sleeve 61, the rotating ring sleeve 61 is finely adjusted by the lever 7 so that the notch of the retainer 63 on the ring sleeve is aligned with the "T" shaped buckle 64 on the locking nut 53. Then, the two are rotated at the same speed, and the buckle 64 can slide smoothly into the retainer 63. At this time, the fixed connection between the steel arch frame 1 and the foot anchor rod 2 is completed. This step replaces the traditional on-site welding and quickly fixes the steel arch frame 1 and the foot anchor rod 2. Finally, the position of the steel arch frame 1's feet is finely adjusted using the adjustment component 6: After the buckle 64 engages with the seat 63, the locking nut 53 is rotated in one direction. Its thrust is transmitted through the seat 63, rotating ring 61, retaining ring 62, and fixing sleeve 51, ultimately reaching the support rod 32 and the entire foot of the steel arch frame 1, pushing it slightly towards the tunnel wall. Conversely, rotating the locking nut 53 in the opposite direction causes the head of the buckle 64 to hook onto the right-angled inner corner of the seat 63, forming a latch. This, along with the rotating ring 61 and other components, pulls the foot of the steel arch frame 1 back away from the rock wall. Through this forward and reverse rotation push-pull mechanism, the spatial position of the steel arch frame 1's feet can be easily adjusted until it is precisely aligned with the bottom ends of adjacent steel arch frames 1 in a straight line, ensuring uniform stress and neat arrangement of the support system.

[0035] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A deformation control support device for tunnels in hard surrounding rock, characterized in that: It includes a steel arch frame (1), foot anchors (2), extension components (3), locking components (5), and adjustment components (6). The steel arch frame (1) is located inside the tunnel, and its outer arc surface abuts against the inner wall of the tunnel. The foot anchor (2) is embedded inside the tunnel and located on both sides of the foot of the steel arch frame (1). The extension component (3) and the foot anchor (2) are located on both sides of the foot of the steel arch frame (1), and the extension component (3) is rotatably connected to the foot of the steel arch frame (1). After the extension component (3) is unfolded, it forms a triangular support structure. The locking component (5) is fixedly connected to the extension component (3). The adjustment component (6) is rotatably connected to the locking component (5) and located between the locking component (5) and the anchor. The extension component (3) extends to increase the contact area between the steel arch frame (1) and the bottom of the tunnel, and the foot anchor (2) passes through the locking component (5) and embeds itself into the tunnel after the extension component (3) extends; The adjustment component (6) is used to adjust the position of the foot of the steel arch frame (1) during the locking process of the locking component (5).

2. The deformation control support device for hard surrounding rock tunnels according to claim 1, characterized in that: The extension component (3) includes a hinge plate (31), a strut (32), and a snap-fit ​​bolt (33); the hinge plate (31) is located on both sides of the steel arch frame (1) and is rotatably connected to the foot of the steel arch frame (1); one end of the strut (32) is rotatably connected to the hinge plate (31); the snap-fit ​​bolt (33) is installed through the steel arch frame (1); and the end of the strut (32) abuts against the bottom of the snap-fit ​​bolt (33).

3. The deformation control support device for hard surrounding rock tunnels according to claim 2, characterized in that: The foot of the steel arch frame (1) is also fixedly connected to a baffle (301). The hinge plate (31) and the steel arch frame (1) are provided with an abutment groove (302). After the hinge plate (31) is opened, both sides of the baffle (301) are in the abutment groove (302), and at this time the bottom surface of the hinge plate (31) and the bottom surface of the baffle (301) are on the same plane.

4. The deformation control support device for hard surrounding rock tunnels according to claim 3, characterized in that: The distance from the connection end of the hinge plate (31) to the steel arch frame (1) to the inner wall of the steel groove of the steel arch frame (1) is greater than the thickness of the strut (32).

5. The deformation control support device for hard surrounding rock tunnels according to claim 4, characterized in that: The inner wall of the steel channel of the steel arch frame (1) is also fixedly connected with two sets of abutment blocks (4), and the distance between the two sets of abutment blocks (4) is equal to the width of the support rod (32).

6. The deformation control support device for hard surrounding rock tunnels according to claim 5, characterized in that: The locking assembly (5) includes a fixing sleeve (51), a push thread (52), and a locking nut (53); the fixing sleeve (51) is fixedly connected to the support rod (32), the push thread (52) is opened near the outer end of the foot anchor rod (2), and the locking nut (53) is threadedly connected to the push thread (52) section on the foot anchor rod (2).

7. A deformation control support device for hard surrounding rock tunnels according to claim 6, characterized in that: The outer end diameter of the foot anchor (2) is smaller than the diameter of the location of the push thread (52).

8. The deformation control support device for hard surrounding rock tunnels according to claim 7, characterized in that: The adjustment assembly (6) includes a rotating ring sleeve (61), a retaining ring (62), a retaining seat (63), and a buckle (64). The rotating ring sleeve (61) is rotatably connected to the inside of the fixed sleeve (51). The retaining ring (62) is fixedly connected to both ends of the rotating ring sleeve (61). The fixed sleeve (51) is located between the retaining rings (62). The retaining seat (63) is fixedly connected to the side of the rotating ring sleeve (61) near the locking nut (53). The retaining seat (63) is composed of two sets of right-angled rods symmetrically arranged. The retaining seat (63) is provided with multiple sets arranged in a ring-shaped equidistant array on the outside of the rotating ring sleeve (61). The buckle (64) is fixedly connected to the side of the locking nut (53) facing the rotating ring sleeve (61). The buckle (64) is arranged in a "T" shape and the number is the same as that of the retaining seat (63).

9. A deformation control support device for hard surrounding rock tunnels according to claim 8, characterized in that: The outer end of the card holder (63) is rounded.

10. A deformation control support device for hard surrounding rock tunnels according to claim 9, characterized in that: A lever (7) is also fixedly connected to the periphery of the retaining ring (62) on the side away from the locking nut (53) on the rotating ring sleeve (61).

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