Underground high stress broken rock roadway active supporting device and manufacturing method

Abstract

The application provides a kind of underground high stress broken rock roadway active supporting device and manufacturing method, belongs to underground mine supporting technical field.The underground high stress broken rock roadway active supporting device includes inverted U-shaped steel arch main body and steel expansion beam sleeved at the curved portion of the top of inverted U-shaped steel arch main body, and the steel expansion beam is close to the roof of surrounding rock.The recess of inverted U-shaped steel arch main body and the recess of steel expansion beam are oppositely arranged to form a containing cavity.The containing cavity includes a plurality of first containing areas for setting one-way expansion limiting components and second containing areas for loading expansion material, which are arranged at intervals.The side of the steel expansion beam close to the roof of surrounding rock at the second containing area is provided with a water injection hole.The application actively, timely and effectively supports the broken roof surrounding rock by using strong expansion principle, and is positioned by one-way expansion limiting component.Under the synergistic effect of expansion material and one-way expansion limiting component, active supporting prestress is generated to prevent the steel expansion beam from retracting.

Description

Technical Field

[0001] This invention relates to the field of underground mine support technology, and in particular to an active support device and manufacturing method for underground high-stress fractured rock tunnels. Background Technology

[0002] During underground mine tunnel excavation, when encountering areas with poor surrounding rock stability, shotcrete, rock bolts, metal mesh, or a combination thereof are typically used for support to ensure roof safety. For more fractured tunnels or those with more developed joints and fissures, steel arch frames are often used for "support as excavation progresses," maintaining tunnel stability and preventing the risk of roof collapse and casualties. Existing steel arch frame support primarily uses precast U-shaped steel as the main load-bearing component. The shape of the precast steel arch frame is similar to that of the tunnel being excavated, and it is installed as close as possible to the tunnel walls to achieve the purpose of supporting the tunnel. This type of support utilizes the advantages of steel itself—high support strength, providing passive support, and limiting tunnel deformation—and is widely used in major mines. Patent application CN201822089703.2 discloses a tunnel support structure, including a support component and an inflatable component. The support component is disposed along the surrounding rock surface of the tunnel, and a gap exists between the support component and the surrounding rock surface. The inflatable component includes an airbag disposed in the gap, and the airbag can be inflated to fill the gap. However, although the airbag can provide some support, the strength of the airbag itself is limited, and the airbag is easily crushed by high pressure, resulting in air leakage, thus failing to provide support for tunnels in high-stress fractured rock.

[0003] Regardless of the support method used, the surrounding rock is in a passive support state, posing a safety hazard of roof collapse and fall due to further expansion of joints and fissures and increased plastic deformation of the surrounding rock after tunnel excavation. Therefore, to address the support problem of fractured rock tunnels under high stress conditions, it is necessary to transform and innovate traditional support methods to overcome the technical bottlenecks of their inability to actively limit the deformation of the surrounding rock and provide sufficient prestress and support.

[0004] Further review of relevant construction records and literature has revealed some basic research on active pressure bearing of steel arch frames in China. This research primarily includes expandable steel arch frames based on expansion devices and adjustable steel arch frames with adjustable arch bridges added to the top. The basic principle is to increase the contact points between the steel arch frame and the roadway roof by manually operating a transmission device, thereby applying prestress to the roadway roof to achieve active support. However, current improvements to active pressure bearing of steel arch frames mainly rely on mechanical transmission devices such as threaded frames, bearings, and gears. This method of manually operating transmission devices to apply pressure has limited prestress strength to the roadway roof, and bearings and gears require high-precision mechanical parts, which undoubtedly increases the difficulty of manufacturing and installation. The complex structure and installation process mean higher manufacturing costs, which somewhat hinders the production efficiency of mines.

[0005] In view of this, it is necessary to design an improved active support device and manufacturing method for underground high-stress fractured rock tunnels to solve the above problems. Summary of the Invention

[0006] The purpose of this invention is to provide an active support device and manufacturing method for underground high-stress fractured rock tunnels. This active support device utilizes the strong expansion principle of water injection into the expansive material to actively, promptly, and effectively support the fractured surrounding rock of the roof. At the same time, with the synergistic effect of the unidirectional expansion limiting component, it prevents the steel expansion beam from shrinking while generating active support prestress, automatically realizing unidirectional expansion support without human intervention. In addition, the expansion force generated by the expansive material is large, which further increases the prestress support effect and results in high overall support strength.

[0007] To achieve the above-mentioned objectives, this invention provides an active support device for underground high-stress fractured rock tunnels, comprising an inverted U-shaped steel arch frame body and a steel expansion beam sleeved at the top bend of the inverted U-shaped steel arch frame body, the steel expansion beam being located near the roof of the surrounding rock; the grooves of the inverted U-shaped steel arch frame body and the grooves of the steel expansion beam are arranged opposite to each other to form a receiving cavity; the receiving cavity includes a plurality of spaced first receiving areas for accommodating unidirectional expansion limiting components and a second receiving area for loading expansion material, wherein the steel expansion beam in the second receiving area has a water injection hole on the side near the roof of the surrounding rock; the unidirectional expansion limiting component includes two pieces disposed at the bottom of the first receiving area. The system comprises symmetrically arranged metal plates and a movable assembly for displacing the metal plates. A limiting hole is located at the center of the integral structure formed by the two metal plates. A second through hole corresponding to the limiting hole is located at the bottom of the groove of the inverted U-shaped steel arch body of the first receiving area. A one-way support rod is fitted into the limiting hole and the second through hole, and several limiting blocks are provided on the one-way support rod. The movable assembly includes a limiting spring disposed between the metal plates and the sidewall of the first receiving area. After the expansion material is injected with water and expands, it pushes the steel expansion beam towards the top of the surrounding rock and positions it through the one-way expansion limiting assembly to prevent the steel expansion beam from retracting, thus achieving one-way expansion support.

[0008] As a further improvement of the present invention, the limiting block is a cylindrical structure with different diameters at the upper and lower ends, and the maximum diameter of the limiting block is equal to the maximum size of the limiting hole and the diameter of the second through hole when the two metal plates are at their maximum displacement.

[0009] As a further improvement of the present invention, one end of the limiting spring is welded to the side wall of the first receiving area, and the other end is welded to the metal plate.

[0010] As a further improvement of the present invention, the steel expansion beam in the first receiving area is provided with a first through hole on the side near the top plate of the surrounding rock for the unidirectional support rod to pass through; one end of the unidirectional support rod passing through the first through hole is provided with a mortise, the size of which is larger than the diameter of the first through hole; the other end of the unidirectional support rod is provided with a thread and an adjusting nut fitted on the thread.

[0011] As a further improvement of the present invention, the first through hole, the limiting hole and the second through hole are located on the same straight line.

[0012] As a further improvement of the present invention, the length of the steel expansion beam is equal to 2 / 3 to 3 / 4 of the length of the top bend of the inverted U-shaped steel arch frame.

[0013] As a further improvement of the present invention, the total length of the plurality of limiting blocks on the unidirectional support rod is equal to the sum of the vertical cross-sectional length of the inverted U-shaped steel arch frame body and the steel expansion beam.

[0014] As a further improvement of the present invention, a rectangular pressure plate is provided at the bottom of the inverted U-shaped steel arch frame body.

[0015] As a further improvement of the present invention, the rectangular bearing plate is welded to the bottom of the inverted U-shaped steel arch frame body.

[0016] The present invention also provides a support method for the above-mentioned active support device for underground high-stress fractured rock tunnels, comprising the following steps:

[0017] S1. Load the expansion material into the groove of the inverted U-shaped steel arch body in the second accommodating area, and sleeve the steel expansion beam at the top bend of the inverted U-shaped steel arch body; install the unidirectional expansion limiting component in the first accommodating area to obtain an active support device for underground high-stress fractured rock tunnels;

[0018] S2. Place the active support device for underground high-stress fractured rock tunnels in the tunnel area that needs support, inject water into the water injection hole, and after the expansion material expands, push the steel expansion beam to fit against the roof of the surrounding rock, and position it through the unidirectional expansion limiting component to achieve unidirectional support.

[0019] The beneficial effects of this invention are:

[0020] (1) This invention provides an active support device for underground high-stress fractured rock tunnels. A steel expansion beam is fitted at the bend of the top of the inverted U-shaped steel arch frame. A unidirectional expansion limiting component and expansion material are spaced apart in the cavity formed by the inverted U-shaped steel arch frame and the steel expansion beam. Utilizing the strong expansion principle of the expansion material through water injection, it actively, promptly, and effectively supports the fractured surrounding rock of the roof. Positioned by the unidirectional expansion limiting component, the expansion material and the unidirectional expansion limiting component work synergistically to generate support prestress, while simultaneously preventing the steel expansion beam from retracting, automatically achieving unidirectional expansion support without human intervention. Furthermore, the expansion force generated by the expansion material is large, further enhancing the prestressed support effect and resulting in high overall support strength.

[0021] (2) This invention provides an active support device for underground high-stress fractured rock tunnels. The unidirectional expansion limiting component has a simple and ingenious structural design, which can push the steel expansion beam upward while preventing it from retracting, thus achieving unidirectional support. The presence of the rectangular bearing plate reduces the damage to the tunnel floor caused by the prestressing of the inverted U-shaped steel arch frame. Under the combined action of the unidirectional expansion limiting component and the rectangular bearing plate, the overall stability and load-bearing capacity of the active support device for underground high-stress fractured rock tunnels are increased.

[0022] (3) The present invention provides an active support device for underground high-stress fractured rock tunnels. It has a simple structure and is easy to construct. At the same time, it can independently adjust the rise of the steel expansion beam by expanding and pressurizing, so that the steel expansion beam can form effective contact with the tunnel roof, apply prestress to the roof, and thus provide sufficient support strength. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the active support device for underground high-stress fractured rock tunnels according to the present invention.

[0024] Figure 2 This is a schematic diagram of the structure of the active support device for underground high-stress fractured rock tunnels after water injection and expansion, according to the present invention.

[0025] Figure 3 This is a top view of the active support device for underground high-stress fractured rock tunnels according to the present invention.

[0026] Figure 4 This is a top view of the inverted U-shaped steel arch frame main groove in the first accommodating area.

[0027] Figure 5 This is a schematic diagram of the structure of a unidirectional expansion limiting component.

[0028] Figure Labels

[0029] 1-Inverted U-shaped steel arch frame main body; 2-Steel expansion beam; 3-One-way expansion limiting component; 4-Expansion material; 5-Rectangular bearing plate; 21-Water injection hole; 31-Metal plate; 32-Limiting hole; 33-One-way support rod; 34-Limiting spring; 331-Limiting block; 332-Rivet; 333-Adjusting nut. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0031] It should also be noted that, in order to avoid obscuring the present invention with unnecessary details, only the structures and / or processing steps closely related to the present invention are shown in the accompanying drawings, while other details that are not closely related to the present invention are omitted.

[0032] Additionally, it should be noted that the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0033] Please see Figures 1 to 5As shown, this invention provides an active support device for underground high-stress fractured rock tunnels, including an inverted U-shaped steel arch frame body 1 and a steel expansion beam 2 fitted at the top bend of the inverted U-shaped steel arch frame body 1, with the steel expansion beam 2 near the roof of the surrounding rock. The grooves of the inverted U-shaped steel arch frame body 1 and the grooves of the steel expansion beam 2 are arranged opposite to each other to form a receiving cavity. The receiving cavity includes several spaced first receiving areas for setting unidirectional expansion limiting components 3 and second receiving areas for loading expansion material 4. The side of the steel expansion beam 2 in the second receiving area near the roof of the surrounding rock is provided with a water injection hole 21. With this configuration, after the expansion material 4 is injected with water and expands, it pushes the steel expansion beam 2 to fit against the roof of the surrounding rock and is positioned by the unidirectional expansion limiting components 3 to prevent the steel expansion beam 2 from retracting, thus achieving unidirectional expansion support.

[0034] Specifically, both the grooves in the inverted U-shaped steel arch frame body 1 and the grooves in the steel expansion beam 2 are U-shaped grooves. The opening of the groove in the inverted U-shaped steel arch frame body 1 faces the roof of the surrounding rock, while the opening of the groove in the steel expansion beam 2 faces away from the roof of the surrounding rock. The outer wall dimensions of the inverted U-shaped steel arch frame body 1 are the same as the inner cavity dimensions of the steel expansion beam 2, so that the inverted U-shaped steel arch frame body 1 and the steel expansion beam 2 can be nested together to form a cavity. Figure 1 As shown, in this embodiment, the accommodating cavity includes five spaced-apart first and second accommodating areas, specifically three first accommodating areas and two second accommodating areas. The first and second accommodating areas are independent and not connected (separated by several small steel plates vertically welded and fixed inside the grooves of the inverted U-shaped steel arch frame 1 and the steel expansion beam 2), and the size of the first accommodating area is smaller than the size of the second accommodating area. This arrangement allows for the loading of more expansion material 4, providing stronger support for the steel expansion beam 2.

[0035] The main body 1 of the inverted U-shaped steel arch frame is made of ordinary U-shaped steel, and the curved part is a three-centered arch structure similar to the cross-section of a tunnel. The steel expansion beam 2 is made of ordinary U-shaped steel, and has an arched structure. Its length is equal to 2 / 3 to 3 / 4 of the length of the curved part at the top of the main body 1 of the inverted U-shaped steel arch frame.

[0036] The bottom of the groove of the inverted U-shaped steel arch frame body 1 in each first receiving area is provided with a second through hole for the unidirectional expansion limiting component 3 to pass through. The unidirectional expansion limiting component 3 includes two symmetrically arranged metal plates 31 set at the bottom of the first receiving area and a moving component for displacing the metal plates 31. A limiting hole 32 is provided at the center of the whole formed by the two metal plates 31. The positions of the limiting hole 32 and the second through hole are corresponding. A unidirectional support rod 33 is fitted in the limiting hole 32 and the second through hole. Several limiting blocks 331 are provided on the unidirectional support rod 33. The limiting blocks 331 are cylindrical structures with different diameters at the upper and lower ends (e.g., Figure 5As shown, the limiting block 331 is a cylindrical structure composed of several concentric circles with progressively increasing diameters from top to bottom, and its cross-section is conical (the upper part refers to the side closer to the top of the surrounding rock, and the lower part refers to the side farther from the top of the surrounding rock). The maximum diameter of the limiting block 331 is equal to or slightly larger than the maximum size of the limiting hole 32 when the two metal plates 31 are at their maximum displacement, and is also equal to the diameter of the second through hole; the minimum diameter of the limiting block 331 is equal to the diameter of the limiting hole 32 when the two metal plates 31 are in contact. With this configuration, under the action of the expansion material 4, when the maximum diameter of the limiting block 331 passes through the second through hole and the limiting hole 32, the limiting hole 32 contracts, and the maximum diameter of the limiting block 331 is stuck on the two metal plates 31, preventing it from being pressed back into the limiting hole 32. This allows the unidirectional support rod 33 to play a positioning role, preventing the steel expansion beam 2 from retracting and achieving unidirectional expansion support. Each limiting block 331 is relatively short. Even if a limiting block 331 gets stuck in the limiting hole 32 during the expansion of the expansion material 4, the steel expansion beam 2 will only retract to the maximum diameter of the adjacent limiting block 331 and engage when subjected to the counter pressure of the surrounding rock. At this time, the retraction distance of the steel expansion beam 2 is very small and can be ignored.

[0037] The movable component includes a limiting spring 34 disposed between the metal plate 31 and the side wall of the first receiving area. One end of the limiting spring 34 is welded to the steel plate of the side wall of the first receiving area, and the other end is welded to the metal plate 31. The size of the limiting hole 32 at the center of the whole formed by the two metal plates 31 is adjusted by the degree of compression of the limiting spring 34.

[0038] In other embodiments, the moving component includes a slider disposed on the metal plate 31 and a corresponding groove disposed in the first receiving area.

[0039] The steel expansion beam 2 in the first receiving area has a first through hole on the side near the top of the surrounding rock for the unidirectional support rod 33 to pass through; the first through hole, the limiting hole 32, and the second through hole are located on the same straight line. One end of the unidirectional support rod 33 passing through the first through hole has a mortise 332, the size of which is larger than the diameter of the first through hole; the other end of the unidirectional support rod 33 has a thread and an adjusting nut 333 fitted onto the thread (the adjusting nut 333 is located outside the first receiving area), the diameter of which is larger than the diameter of the second through hole. This arrangement, through the cooperation of the mortise 332 and the adjusting nut 333, firmly connects the inverted U-shaped steel arch frame body 1 and the steel expansion beam 2, forming a stable whole. Specifically, each steel expansion beam 2 in each receiving area has a hole on the side near the top of the surrounding rock; the hole in the first receiving area is the first through hole, and the hole in the second receiving area is the water injection hole 21. The bottom of the inverted U-shaped steel arch frame body 1 in the first receiving area has a second through hole.

[0040] As the power source for the movement of the steel expansion beam 2, the expansion material 4 expands after being injected with water, pushing the steel expansion beam 2 to fit tightly against the top of the surrounding rock. The total length of the several limiting blocks 331 on the unidirectional support rod 33 is equal to the sum of the vertical cross-sectional lengths of the inverted U-shaped steel arch frame 1 and the steel expansion beam 2 (the thickness of the metal plate 31 can be ignored). That is, the maximum lifting height of the steel expansion beam 2 does not exceed the vertical cross-sectional length of the inverted U-shaped steel arch frame 1.

[0041] The expansion material 4 uses calcium oxide as its basic component. When mixed with an appropriate amount of water, it undergoes a hydration reaction and expands in volume, providing sufficient expansion pressure for the active support device of the underground high-stress fractured rock tunnel.

[0042] A rectangular bearing plate 5 is provided at the bottom of the inverted U-shaped steel arch frame body 1. The rectangular bearing plate 5 is vertically welded to the bottom of the inverted U-shaped steel arch frame body 1. The rectangular bearing plate 5 is made of rectangular thick steel plate and is used to disperse the pressure at the end of the inverted U-shaped steel arch frame body 1, reduce the damage caused by the inverted U-shaped steel arch frame body 1 to the surrounding rock of the roadway floor, and increase the overall pressure bearing capacity of the active support device for the underground high-stress fractured rock roadway.

[0043] The present invention also provides a method for manufacturing an active support device for underground high-stress fractured rock tunnels, comprising the following steps:

[0044] S1. First, load the expansion material 4 into the groove of the inverted U-shaped steel arch body 1 in the second accommodating area, and then fit the steel expansion beam 2 onto the top bend of the inverted U-shaped steel arch body 1; then, pass the one-way support rod 33 through the second through hole, the limiting hole 32 and the first through hole, and weld the mortise 332 at one end of the one-way support rod 33 that passes through the first through hole, so that the one-way expansion limiting component 3 is installed in the first accommodating area, and obtain the active support device for underground high-stress fractured rock tunnel.

[0045] S2. The active support device for underground high-stress fractured rock tunnels is placed in the tunnel area requiring support. Water is injected into the injection hole 21. After the expansion material 4 expands, it pushes the steel expansion beam 2 to fit against the roof of the surrounding rock and is positioned by the one-way expansion limiting component 3 to achieve one-way support. Specifically, during the upward movement of the steel expansion beam 2, the one-way support rod 33 in the one-way expansion limiting component 3 moves upward with the steel expansion beam 2 with the help of the mortise 332. When the one-way support rod 33 rises, several limiting blocks 331 pass through the limiting hole 32 in sequence. The diameter of the one-way support rod 33 passing through the limiting hole 32 undergoes a repetitive change from small to large and then back to small. During the transition from small to large diameter, the limiting blocks 331 on the one-way support rod 33 will squeeze the two metal plates 31, causing the limiting spring 34 to be compressed, expanding the diameter of the limiting hole 32, and allowing the limiting blocks 331 to pass smoothly through the limiting hole 32. 2; When the maximum diameter of the previous limiting block 331 passes through the limiting hole 32, the minimum diameter of the next limiting block 331 contacts the limiting hole 32 (i.e., the diameter of the one-way support rod 33 becomes the minimum again). The limiting spring 34 rebounds, and the two metal plates 31 approach and fit together, restoring the diameter of the limiting hole 32 formed by the two metal plates 31 to the minimum size, so that the limiting hole 32 just locks the bottom of the previous limiting block 331, restricting the retraction of the one-way support rod 33, and thus restricting the retraction of the steel expansion beam 2, increasing the overall bearing capacity of the active support device for the underground high-stress fractured rock tunnel, and realizing one-way expansion support.

[0046] In summary, this invention provides an active support device and manufacturing method for underground high-stress fractured rock tunnels. The active support device utilizes the synergistic effect of an expansion material and a unidirectional expansion limiting component to generate support prestress, preventing the steel expansion beam from retracting and automatically achieving unidirectional expansion support without human intervention. Simultaneously, the expansion force generated by the expansion material is substantial, further enhancing the prestressed support effect and resulting in high overall support strength. This active support device for underground high-stress fractured rock tunnels has a simple structure and is easy to construct. Furthermore, it can autonomously adjust the rise of the steel expansion beam through expansion and pressurization, enabling effective contact between the steel expansion beam and the tunnel roof, applying prestress to the roof, and thus providing sufficient support strength.

[0047] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. An active support device for underground high-stress fractured rock tunnels, characterized in that, The system includes an inverted U-shaped steel arch frame body and a steel expansion beam fitted at the top bend of the inverted U-shaped steel arch frame body, the steel expansion beam being located near the top of the surrounding rock slab. The grooves of the inverted U-shaped steel arch frame body and the steel expansion beam are arranged opposite each other to form a receiving cavity. The receiving cavity includes several spaced-apart first receiving areas for accommodating unidirectional expansion limiting components and second receiving areas for loading expansion material. A water injection hole is provided on the side of the steel expansion beam near the top of the surrounding rock slab in the second receiving area. The unidirectional expansion limiting component includes two symmetrically arranged metal plates located at the bottom of the first receiving area and a mechanism for... The movable component that undergoes displacement has a limiting hole at the center of the integral formed by the two metal plates. The bottom of the groove of the inverted U-shaped steel arch frame body of the first receiving area has a second through hole corresponding to the limiting hole. A one-way support rod is sleeved in the limiting hole and the second through hole. The one-way support rod has several limiting blocks. The movable component includes a limiting spring disposed between the metal plate and the side wall of the first receiving area. After the expansion material is injected with water and expands, it pushes the steel expansion beam to fit against the top of the surrounding rock and is positioned by the one-way expansion limiting component to prevent the steel expansion beam from retracting, thereby realizing one-way expansion support.

2. The active support device for underground high-stress fractured rock tunnels according to claim 1, characterized in that, The limiting block is a cylindrical structure with different diameters at the upper and lower ends. The maximum diameter of the limiting block is equal to the maximum size of the limiting hole and the diameter of the second through hole when the two metal plates are at their maximum displacement.

3. The active support device for underground high-stress fractured rock tunnels according to claim 2, characterized in that, One end of the limiting spring is welded to the side wall of the first receiving area, and the other end is welded to the metal plate.

4. The active support device for underground high-stress fractured rock tunnels according to claim 3, characterized in that, The steel expansion beam in the first accommodating area has a first through hole on the side near the top of the surrounding rock for the unidirectional support rod to pass through; one end of the unidirectional support rod passing through the first through hole has a mortise, the size of which is larger than the diameter of the first through hole; the other end of the unidirectional support rod has a thread and an adjusting nut fitted on the thread.

5. The active support device for underground high-stress fractured rock tunnels according to claim 4, characterized in that, The first through hole, the limiting hole, and the second through hole are located on the same straight line.

6. The active support device for underground high-stress fractured rock tunnels according to claim 1, characterized in that, The length of the steel expansion beam is equal to 2 / 3 to 3 / 4 of the length of the top bend of the inverted U-shaped steel arch frame.

7. The active support device for underground high-stress fractured rock tunnels according to claim 2, characterized in that, The total length of the limiting blocks on the unidirectional support rod is equal to the sum of the vertical cross-sectional lengths of the inverted U-shaped steel arch frame and the steel expansion beam.

8. The active support device for underground high-stress fractured rock tunnels according to claim 1, characterized in that, The bottom of the inverted U-shaped steel arch frame is provided with a rectangular pressure plate.

9. The active support device for underground high-stress fractured rock tunnels according to claim 8, characterized in that, The rectangular bearing plate is welded to the bottom of the inverted U-shaped steel arch frame body.

10. A method for manufacturing an active support device for underground high-stress fractured rock tunnels according to any one of claims 1 to 9, characterized in that, Includes the following steps: S1. Load the expansion material into the groove of the inverted U-shaped steel arch body in the second accommodating area, and sleeve the steel expansion beam at the top bend of the inverted U-shaped steel arch body; install the unidirectional expansion limiting component in the first accommodating area to obtain an active support device for underground high-stress fractured rock tunnels; S2. Place the active support device for underground high-stress fractured rock tunnels in the tunnel area that needs support, inject water into the water injection hole, and after the expansion material expands, push the steel expansion beam to fit against the roof of the surrounding rock, and position it through the unidirectional expansion limiting component to achieve unidirectional support.

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