A tunnel cross-hole transition section excavation auxiliary steel frame

Abstract

The application belongs to the field of steel frames, and particularly relates to a tunnel horizontal hole transition section excavation auxiliary steel frame, which comprises a steel frame body, the steel frame body comprises a plurality of separation plates, the plurality of separation plates are rotationally connected through butt shafts between heads and tails, the separation plates are arc-shaped steel plates, a limiting assembly is arranged between adjacent separation plates, the limiting assembly is used for limiting the rotating angle between the separation plates, the separation plates cannot rotate through limiting and fixing by the limiting assembly, the spiral steel frame body can well cover the inner wall of the tunnel, and the separation plates can rotate with each other to adapt to various different radii of the inner wall of the tunnel, the whole process does not need welding and complex planning, and only needs to continuously lay new separation plates following the tunnel excavation, in the subsequent tunnel pouring process, the steel frame body does not need to be taken out, and can be directly poured together with the concrete, the construction efficiency is effectively improved, and the period required for tunnel excavation is reduced.

Description

Technical Field

[0001] This invention belongs to the field of steel frames, specifically a steel frame for excavation of a tunnel cross passage transition section. Background Technology

[0002] Tunnels are engineering structures buried in the earth's strata and are a form of human utilization of underground space. Tunnels can be divided into traffic tunnels, hydraulic tunnels, municipal tunnels, mining tunnels, and military tunnels. The cross passages of tunnels are used as escape routes, allowing people to escape to another tunnel in the event of a tunnel collapse.

[0003] A cross passage is an auxiliary tunnel set up during the construction of a long tunnel to shorten the construction period and increase the working face. During the tunnel construction phase, it facilitates rapid construction. During the tunnel operation phase, it can be used as an entrance or ventilation shaft. In the early stage of excavation, in order to ensure the stability of the soil, steel frames need to be erected to support the soil and reduce soil falling.

[0004] During the excavation of existing tunnels, in order to reinforce the tunnel walls and reduce soil loosening, steel frames need to be built on the inner walls of the tunnel. However, the inner diameter of the tunnel is very large, and building the steel frames requires a huge amount of time. In addition, depending on the shape of the tunnel, retaining steel plates with different curvatures need to be customized to just support the inner walls of the tunnel.

[0005] Therefore, the present invention provides an auxiliary steel frame for excavation of the transition section of a tunnel cross passage. Summary of the Invention

[0006] In order to overcome the shortcomings of the prior art, at least one technical problem raised in the background art is solved.

[0007] The technical solution adopted by this invention to solve its technical problem is as follows: An auxiliary steel frame for excavation of a tunnel cross passage transition section, comprising a steel frame body, wherein the steel frame body includes multiple separation plates, the ends of which are rotatably connected by a connecting shaft. Each separation plate is an arc-shaped steel plate, and a limiting component is provided between adjacent separation plates. The limiting component restricts the rotation angle between the separation plates, thus preventing them from rotating. The spiral-shaped steel frame body can effectively cover the tunnel inner wall, and because the separation plates can rotate relative to each other, it adapts to various curvatures within the tunnel inner wall. The entire process requires no welding or complex planning; new separation plates are simply laid continuously as the tunnel is excavated. During subsequent tunnel pouring, the steel frame body does not need to be removed and can be directly poured together with the concrete, effectively improving construction efficiency and reducing the tunnel excavation cycle.

[0008] Preferably, the docking shaft includes a horizontal plate and a clamping block. The clamping block has a groove in its middle, and the horizontal plate is inserted into the groove. The width of the horizontal plate is smaller than the width of the groove. Through holes are provided through the middle of both the clamping block and the horizontal plate. A long rod is slidably connected in the through hole. The diameter of the long rod is smaller than the diameter of the through hole, allowing the steel frame body to be laid at an angle to form a spiral shape. At the same time, depending on the soil conditions, for softer and more easily collapsed soil, the pitch of the spiral of the steel frame body can be reduced, allowing the steel frame body to fit more densely against the inner wall of the tunnel, thereby improving the applicability of the equipment.

[0009] Preferably, a docking plate and an insertion plate are fixedly connected to the inner arc surface of the separation plate. Holes are opened on the outer surfaces of both the docking plate and the insertion plate. A reinforcing rod is inserted into one end of the insertion plate. The reinforcing rod is perpendicular to the separation plate. After the separation plate is rotated to the correct angle and supported by the tunnel face, the reinforcing rod is inserted from the insertion plate and passes through another parallel docking plate to fix it. By setting multiple sets of reinforcing rods, not only can the spiral steel frame body be reinforced, but also the exposed parts of the soil not in contact with the steel frame body can be supported, further improving the soil support effect.

[0010] Preferably, the limiting component includes a retaining base, which includes a central retaining arm and a gap retaining arm. Both the central retaining arm and the gap retaining arm are fixedly connected to the end of the separation plate. A gap is provided in the middle of the gap retaining arm, and the central retaining arm is located in the middle of the gap retaining arm. Both the central retaining arm and the gap retaining arm are arc-shaped. A locking post is provided between the central retaining arm and the gap retaining arm. When two adjacent separation plates are in contact with the soil, the locking post is placed in the central retaining arm and the gap retaining arm, thereby preventing the central retaining arm and the gap retaining arm from moving and fixing the arc. This configuration has a simple structure, stable force, and can effectively maintain and support the steel frame body.

[0011] Preferably, the central clamping arm and the gap clamping arm are staggered, and multiple friction grooves are formed on the opposite side of the central clamping arm and the gap clamping arm. The ends of the central clamping arm and the gap clamping arm are barbed. During rotation, the central clamping arm and the gap clamping arm and the staggered gap change from large to small. Only a clamping post of appropriate width needs to be inserted to limit the continued rotation of the separation plate and reduce the problem of the clamping post not being able to be inserted between the central clamping arm and the gap clamping arm.

[0012] Preferably, the outer side of the locking post is provided with two sets of expansion blocks, the inner middle part of the locking post is hollow, and a sliding rod is slidably connected to the inner side of the locking post. Multiple transmission grooves are opened on the outer side of the sliding rod, and multiple moving grooves are opened on the outer side of the locking post. The moving grooves are hollowly connected to the middle part of the locking post. The bottom of the expansion block is slidably connected to the moving groove. A top block is fixed to one end of the expansion block near the sliding rod. The top block is movably fitted with the transmission groove, which can change the diameter of the locking post. Regardless of the angle between the locking seats, it can be held in place by the locking post. At the same time, after the locking post holds it in place, the expansion block can be pushed outward, thereby pushing the separation plate outward again, thus strengthening the connection between the separation plate and the soil.

[0013] Preferably, the end of the slide rod is rotatably connected to a helical bolt, and the end of the locking post is fixedly connected to a fixing nut. The helical bolt and the fixing nut are threadedly connected. By continuously rotating the helical bolt and cooperating with the threaded connection of the fixing nut, the helical bolt can be moved inward or outward. With the rotational connection between the slide rod and the helical bolt, the slide rod can remain stationary, keeping the transmission groove and the top block aligned. This setting makes the transmission process more stable and also gives the slide rod a self-locking function, which can only be adjusted by external rotation.

[0014] Preferably, the outer side of the expansion block is arranged in an arc-shaped cover, and an embedding disc is fixed to the outer arc surface of the separation plate. The outer surface of the embedding disc has multiple holes, and the end of the embedding disc away from the separation plate is flat. With the embedding disc, the embedding disc can be inserted into the soil, further increasing the cohesive force between the separation plate and the soil. The arc shape of the expansion block can make the force more uniform.

[0015] Preferably, a slot is provided on the inner arc surface of the separation plate, and an inclined plate is slidably connected to the inner side of the slot. The inclined plate is located at one end of the reinforcing rod, and a connecting component is provided between the inclined plate and the slot. Through the non-fixed connection between the reinforcing rod and the inclined plate, after the reinforcing rod is fixed to the docking plate and the insertion plate, the inclined plate is inserted into the inclined slot, so that the reinforcing rod cannot be pulled out of the insertion plate, but can move slightly. This allows the steel frame body to be removed without causing shaking, and will not directly affect the fixed connection, thereby reducing the problem of steel frame body breakage.

[0016] Preferably, the connecting component includes a magnet located at the bottom of the slot, the inclined plate is inclined, and a stop is fixed to one end of the reinforcing rod near the inclined plate. The stop is inclined to ensure that the reinforcing rod cannot fall off, but can be slightly shaken to release external forces. The process of fixing the inclined plate is extremely convenient; simply insert the inclined plate into the slot after the reinforcing rod is inserted.

[0017] The beneficial effects of this invention are as follows:

[0018] 1. The present invention discloses an auxiliary steel frame for excavating a tunnel cross passage transition section. Through the installation of separation plates, during tunnel excavation, the separation plates are spirally extended into the tunnel interior. Adjacent separation plates can rotate via connecting shafts. After reaching the desired angle, they are fixed by limiting components, preventing further rotation. The spiral-shaped steel frame body effectively covers the tunnel interior wall. Because the separation plates can rotate relative to each other, it adapts to various curvatures within the tunnel interior wall. The entire process requires no welding or complex planning; simply lay new separation plates as the tunnel is excavated. During subsequent tunnel pouring, the steel frame body does not need to be removed; it can be directly poured together with the concrete, effectively improving construction efficiency and reducing the tunnel excavation cycle.

[0019] 2. The tunnel cross passage transition section excavation auxiliary steel frame of the present invention, through the structure of the connecting shaft, allows adjacent separation plates to rotate only up and down. However, because the diameter of the long rod is smaller than the diameter of the through hole, the vertical rotation connection is not seamless, allowing slight horizontal offset between the two separation plates. This allows the steel frame body to be laid obliquely, forming a spiral shape. At the same time, depending on the soil conditions, for softer and more easily collapsed soil, the pitch of the spiral shape of the steel frame body can be reduced, allowing the steel frame body to fit more densely against the tunnel wall, thereby improving the applicability of the equipment. Attached Figure Description

[0020] The invention will now be further described with reference to the accompanying drawings.

[0021] Figure 1 This is a perspective view of the present invention;

[0022] Figure 2 This is a first-view perspective perspective view of the separation plate of the present invention;

[0023] Figure 3 This is a perspective view of the card holder in this invention;

[0024] Figure 4 This is a schematic diagram of the snap-fit ​​post structure in this invention;

[0025] Figure 5 This is a cross-sectional view of the snap-fit ​​post in this invention;

[0026] Figure 6 This is a second-view perspective perspective view of the separation plate in this invention;

[0027] Figure 7 This is a perspective view of the inclined plate and reinforcing rod in this invention;

[0028] In the diagram: 1. Steel frame body; 2. Separation plate; 3. Connecting plate; 4. Connecting shaft; 5. Card seat; 6. Carding post; 7. Embedded plate; 8. Insertion plate; 9. Inclined plate; 10. Reinforcing rod; 11. Expansion block; 12. Spiral bolt; 13. Gap arm; 14. Center arm; 15. Moving groove; 16. Top block; 17. Fixing nut; 18. Slide rod; 19. Transmission groove; 20. Slot; 21. Stop block. Detailed Implementation

[0029] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0030] Example 1

[0031] like Figures 1 to 2 As shown in the embodiment of the present invention, an auxiliary steel frame for excavation of a tunnel cross passage transition section includes a steel frame body 1. The steel frame body 1 includes multiple separation plates 2, which are rotatably connected end-to-end by a connecting shaft 4. The separation plates 2 are arc-shaped steel plates, and a limiting component is provided between adjacent separation plates 2 to limit the rotation angle between the separation plates 2. During operation, in order to reinforce the tunnel wall and reduce soil loosening during the excavation of existing tunnels, a steel frame needs to be built on the inner wall of the tunnel. However, the inner diameter of the tunnel is very large, and building the steel frame requires a huge amount of time. Moreover, depending on the shape of the tunnel, retaining steel plates with different curvatures need to be customized to just support the inner wall of the tunnel. In this setup, during tunnel excavation, the separation plates 2 are spirally extended into the tunnel interior. Adjacent separation plates 2 can rotate via a connecting shaft 4. After reaching the desired angle, they are fixed in place by a limiting component, preventing further rotation. The spiral-shaped steel frame 1 effectively covers the tunnel wall. Because the separation plates 2 can rotate relative to each other, they adapt to various curvatures within the tunnel wall. The entire process requires no welding or complex planning; simply lay new separation plates 2 as the tunnel excavation progresses. During subsequent tunnel pouring, the steel frame 1 does not need to be removed; it can be directly poured with the concrete, effectively improving construction efficiency and reducing the tunnel excavation cycle.

[0032] like Figure 3 and Figure 6As shown, the docking shaft 4 includes a horizontal plate and a clamping block. A groove is provided in the middle of the clamping block, and the horizontal plate is inserted into the groove. The width of the horizontal plate is smaller than the width of the groove. Through holes are provided in the middle of both the clamping block and the horizontal plate. A long rod is slidably connected in the through hole. The diameter of the long rod is smaller than the diameter of the through hole. During operation, the structure of the docking shaft 4 allows adjacent separating plates 2 to rotate only up and down. However, because the diameter of the long rod is smaller than the diameter of the through hole, the vertical rotation connection is not seamless, allowing slight horizontal displacement between the two separating plates 2. This allows the steel frame body 1 to be laid obliquely, forming a spiral shape. At the same time, depending on the soil conditions, for softer and more easily collapsed soil, the pitch of the spiral state of the steel frame body 1 can be reduced, allowing the steel frame body 1 to fit more densely against the tunnel wall, thereby improving the applicability of the equipment.

[0033] like Figures 2 to 6 As shown, a docking plate 3 and an insertion plate 8 are fixedly connected to the inner arc surface of the separation plate 2. Holes are opened on the outer surfaces of both the docking plate 3 and the insertion plate 8. A reinforcing rod 10 is inserted into one end of the insertion plate 8. The reinforcing rod 10 is set perpendicular to the separation plate 2. During operation, after the separation plate 2 is rotated to the correct angle and supported by the tunnel face, the reinforcing rod 10 is inserted from the insertion plate 8 and passes through the other parallel docking plate 3 to fix the reinforcing rod 10. By setting multiple sets of reinforcing rods 10, not only can the spiral steel frame body 1 be reinforced, but also the exposed parts of the soil that are not in contact with the steel frame body 1 can be supported, further improving the effect of supporting the soil.

[0034] like Figures 2 to 6 As shown, the limiting component includes a retainer 5, which includes a central retaining arm 14 and a gap retaining arm 13. Both the central retaining arm 14 and the gap retaining arm 13 are fixedly connected to the end of the separation plate 2. A gap is provided in the middle of the gap retaining arm 13, and the central retaining arm 14 is located in the middle of the gap retaining arm 13. Both the central retaining arm 14 and the gap retaining arm 13 are arc-shaped. A locking post 6 is provided between the central retaining arm 14 and the gap retaining arm 13. During operation, when two adjacent separation plates 2 are in contact with the soil, the locking post 6 is placed between the central retaining arm 14 and the gap retaining arm 13, thereby preventing the central retaining arm 14 and the gap retaining arm 13 from moving further, thus fixing the arc of the separation plate 2. This configuration is simple in structure, stable in force, and can effectively maintain and support the steel frame body 1.

[0035] like Figures 2 to 3As shown, the central clamping arm 14 and the gap clamping arm 13 are staggered. Multiple friction grooves are provided on the opposite side of the central clamping arm 14 and the gap clamping arm 13. The ends of the central clamping arm 14 and the gap clamping arm 13 are barbed. During operation, the clamping post 6 is placed between the two barbs by staggering the central clamping arm 14 and the gap clamping arm 13. Since the separation plate 2 rotates outward to hold the tunnel soil when connecting the new separation plate 2, the staggered arrangement ensures that the gap between the central clamping arm 14 and the gap clamping arm 13 changes from large to small during rotation. Only a clamping post 6 of appropriate width needs to be inserted to limit the continued rotation of the separation plate 2, reducing the problem of the clamping post 6 not being able to be inserted between the central clamping arm 14 and the gap clamping arm 13.

[0036] like Figures 3 to 5 As shown, two sets of expansion blocks 11 are provided on the outer side of the locking post 6. The middle part of the inner side of the locking post 6 is hollow, and a sliding rod 18 is slidably connected to the inner side of the locking post 6. Multiple transmission grooves 19 are opened on the outer side of the sliding rod 18, and multiple moving grooves 15 are opened on the outer side of the locking post 6. The moving grooves 15 are hollowly connected to the middle part of the locking post 6. The bottom of the expansion block 11 is slidably connected to the moving groove 15. A top block 16 is fixedly connected to one end of the expansion block 11 near the sliding rod 18. The top block 16 is movably fitted with the transmission groove 19. During operation, due to the tunnel... The curvature of the inner wall varies, so various sizes of locking posts 6 are required, which is quite troublesome to prepare. With the setting of expansion block 11, the sliding rod 18 can slide on the inner side of the locking post 6. As the sliding rod 18 and the transmission groove 19 move, the top block 16 and the expansion block 11 will be pushed outward, thereby changing the diameter of the locking post 6. No matter what the angle between the locking seats 5 is, it can be held by the locking post 6. At the same time, after the locking post 6 is held, the expansion block 11 can be pushed outward again, thereby pushing the separation plate 2 outward, thus strengthening the connection between the separation plate 2 and the soil.

[0037] like Figures 3 to 5 As shown, a helical bolt 12 is rotatably connected to the end of the slide rod 18, and a fixing nut 17 is fixedly connected to the end of the locking post 6. The helical bolt 12 and the fixing nut 17 are threadedly connected. During operation, the helical bolt 12 can move inward or outward by rotating continuously and cooperating with the threaded connection of the fixing nut 17. With the rotational connection between the slide rod 18 and the helical bolt 12, the slide rod 18 can remain stationary, keeping the transmission groove 19 and the top block 16 aligned. This design makes the transmission process more stable and also gives the slide rod 18 a self-locking function, which can only be adjusted by external rotation.

[0038] like Figures 2 to 6As shown, the outer side of the expansion block 11 is arranged in an arc-shaped cover, and the outer arc surface of the separation plate 2 is fixed with an embedded disk 7. The outer surface of the embedded disk 7 has multiple holes. The end of the embedded disk 7 away from the separation plate 2 is flat. When working, with the setting of the embedded disk 7, the embedded disk 7 can be inserted into the soil, further increasing the cohesive force between the separation plate 2 and the soil. The arc-shaped setting of the expansion block 11 can make the force more uniform.

[0039] Example 2

[0040] like Figure 7 As shown in the comparative embodiment one, another embodiment of the present invention is as follows: a slot 20 is provided on the inner arc surface of the separation plate 2, and an inclined plate 9 is slidably connected to the inner side of the slot 20. The inclined plate 9 is located at one end of the reinforcing rod 10, and a connecting component is provided between the inclined plate 9 and the slot 20. During operation, the steel frame body 1 is prone to slight shaking during installation or tunnel excavation. If the overall structure is fixed by welding, metal fatigue fracture is likely to occur. By using the non-fixed connection between the reinforcing rod 10 and the inclined plate 9, after the reinforcing rod 10 is fixed to the docking plate 3 and the insertion plate 8, the inclined plate 9 is inserted into the inclined slot, so that the reinforcing rod 10 cannot be pulled out of the insertion plate 8, but can move slightly. This can remove the shaking of the steel frame body 1, and will not directly affect the fixed connection, thereby reducing the problem of steel frame body 1 breaking.

[0041] The connecting assembly includes a magnet located at the bottom of the slot 20. The inclined plate 9 is tilted, and a stop block 21 is fixed to one end of the reinforcing rod 10 near the inclined plate 9. The stop block 21 is also tilted. During operation, after the reinforcing rod 10 is inserted, the inclined plate 9 is inserted into the slot 20. Because the slot 20 is tilted, when the reinforcing rod 10 exerts an outward force on the inclined plate 9, the inclined plate 9 cannot be pushed out due to its tilt, thus ensuring that the reinforcing rod 10 cannot fall off. However, it can be slightly shaken to release external forces. The process of fixing the inclined plate 9 is extremely convenient; simply insert the inclined plate 9 into the slot 20 after the reinforcing rod 10 is inserted.

[0042] During the excavation of existing tunnels, steel frames need to be erected on the inner walls to reinforce the tunnel walls and reduce soil loosening. However, the tunnel's inner diameter is very large, making the erection of these steel frames extremely time-consuming. Furthermore, depending on the tunnel's shape, retaining steel plates with varying curvatures need to be custom-made to properly support the inner walls. By using separating plates 2, during tunnel excavation, these plates are spirally extended into the tunnel. Adjacent separating plates 2 can rotate via connecting shafts 4. After reaching the correct angle, they are fixed in place by limiting components, preventing further rotation. The spiral-shaped steel frame body 1 effectively covers the inner tunnel walls, and because the separating plates 2 can rotate relative to each other, it adapts to various terrains. The various curvatures within the tunnel wall can be constructed without welding or complex planning. New separating plates 2 are continuously laid as the tunnel is excavated. During subsequent tunnel pouring, the steel frame body 1 does not need to be removed; it is directly integrated with the concrete, effectively improving construction efficiency and reducing the tunnel excavation cycle. The connecting shaft 4 structure allows adjacent separating plates 2 to rotate vertically. However, because the diameter of the long rod is smaller than the diameter of the through hole, the vertical connection is not perfectly seamless, allowing for slight horizontal offset between the two separating plates 2. This allows the steel frame body 1 to be laid at an angle, forming a spiral shape, and can be adjusted according to soil conditions. Unlike softer, more easily collapsible soil, the pitch of the spiral of the steel frame body 1 can be reduced, allowing the steel frame body 1 to fit more densely against the tunnel wall, thus improving the applicability of the equipment. After the separation plate 2 is rotated to the correct angle and supported by the tunnel face, the reinforcing rod 10 is inserted from the insertion plate 8 and passes through another parallel connecting plate 3 to fix the reinforcing rod 10. By setting multiple sets of reinforcing rods 10, not only can the spiral steel frame body 1 be reinforced, but the exposed parts of the soil not in contact with the steel frame body 1 can also be supported, further improving the soil support effect. After two adjacent separation plates 2 are in contact with the soil, the clamping column 6 is placed in the central clamping arm 14 and the gap clamping arm 13. This prevents the central clamping arm 14 and the gap clamping arm 13 from moving further, thus fixing the curvature of the separation plate 2. This configuration is simple in structure, stable in force, and can effectively maintain and support the steel frame body 1. By staggering the central clamping arm 14 and the gap clamping arm 13, the clamping post 6 is placed between the two barbs. Since the separation plate 2 rotates outward to press against the tunnel soil when connecting the new separation plate 2, the staggered configuration ensures that the central clamping arm 14, the gap clamping arm 13, and the staggered gap change from large to small during rotation. Only a clamping post 6 of appropriate width needs to be inserted to limit the continued rotation of the separation plate 2, reducing the problem of the clamping post 6 not being able to be inserted between the central clamping arm 14 and the gap clamping arm 13.Because the curvature of the tunnel wall varies, multiple sizes of clamping posts 6 are required, making preparation quite complicated. The expansion block 11 allows the sliding rod 18 to slide inside the clamping post 6. As the sliding rod 18 and transmission groove 19 move, the top block 16 and expansion block 11 are pushed outwards, thus changing the diameter of the clamping post 6. Regardless of the angle between the clamping seats 5, the clamping post 6 can hold it in place. Furthermore, after the clamping post 6 holds it in place, the expansion block 11 is pushed outwards again, further pushing the separation plate 2 outwards, thereby strengthening the connection between the separation plate 2 and the soil. The continuous rotation of the auger 12, combined with the threaded connection of the fixing nut 17, allows the auger 12 to move inwards or outwards. This, combined with the rotational connection between the sliding rod 18 and the auger 12, keeps the sliding rod 18 stationary, ensuring the transmission groove 19 and the top block 16 remain aligned. This design makes the transmission process more stable and gives the slide bar 18 a self-locking function, allowing adjustment only through external rotation. Combined with the embedded plate 7, which can be inserted into the soil, it further increases the cohesive force between the separation plate 2 and the soil. The arc-shaped design of the expansion block 11 ensures more even force distribution. During installation or tunnel excavation, the steel frame body 1 is prone to slight swaying. If the entire structure is fixed by welding, metal fatigue fracture is likely. By using a non-fixed connection between the reinforcing rod 10 and the inclined plate 9, after the reinforcing rod 10 is fixed to the connecting plate 3 and the insert plate 8, the inclined plate 9 is inserted into the inclined groove. This prevents the reinforcing rod 10 from being pulled out of the insert plate 8, but allows for slight movement. This eliminates the swaying of the steel frame body 1, preventing direct impact on the fixed connection and reducing the risk of breakage.

[0043] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A steel frame for tunnel cross adit transition excavation assistance, characterized by: The utility model provides a steel frame body (1) including a plurality of separate plates (2) are connected through butt joint shaft (4) rotationally between head and tail, the separate plate (2) is arc steel sheet, and the adjacent separate plate (2) between is provided with a limit component, and the limit component is used to limit the angle of rotation between the separate plate (2); The limit component includes a clamping seat (5), the clamping seat (5) includes a center clamping arm (14) and a gap clamping arm (13), the center clamping arm (14) and the gap clamping arm (13) are all fixedly connected with the separate plate (2) at the head and tail, a gap is formed in the middle part of the gap clamping arm (13), the center clamping arm (14) is located in the middle part of the gap clamping arm (13), the center clamping arm (14) and the gap clamping arm (13) are both arranged in an arc shape, and a clamping column (6) is arranged between the center clamping arm (14) and the gap clamping arm (13). The center clamping arm (14) and the gap clamping arm (13) are arranged in a staggered manner, a plurality of friction grooves are formed on the opposite side of the center clamping arm (14) and the gap clamping arm (13), and the end of the center clamping arm (14) and the gap clamping arm (13) is arranged in an inverted hook shape. The outer side of the clamping column (6) is provided with two groups of expansion blocks (11), the inner side of the clamping column (6) is hollow, and the inner side of the clamping column (6) is slidably connected with a sliding rod (18), a plurality of transmission grooves (19) are formed in the outer side of the sliding rod (18), a plurality of moving grooves (15) are formed in the outer side of the clamping column (6), the moving grooves (15) are in communication with the hollow part of the clamping column (6), the bottom of the expansion block (11) is slidably connected with the moving groove (15), one end of the expansion block (11) close to the sliding rod (18) is fixedly connected with a top block (16), and the top block (16) is movably attached to the transmission groove (19).

2. A steel frame for tunnel cross adit transition excavation assistance according to claim 1, characterized in that: The butt joint shaft (4) includes a transverse plate and a clamping block, a groove is formed in the middle part of the clamping block, the transverse plate is inserted into the groove, the width of the transverse plate is less than the width of the groove, a through hole is formed in the middle part of the clamping block and the transverse plate, and a long rod is slidably connected in the through hole.

3. A steel frame for tunnel cross adit transition excavation assistance according to claim 1, characterized in that: The inner arc surface of the separate plate (2) is fixedly connected with a butt joint disc (3) and an insertion disc (8), a plurality of holes are formed in the outer surface of the butt joint disc (3) and the insertion disc (8), one end of the insertion disc (8) is inserted with a reinforcing rod (10), and the reinforcing rod (10) is arranged perpendicularly to the separate plate (2).

4. A steel frame for tunnel cross adit transition excavation assistance according to claim 1, characterized in that: The end of the sliding rod (18) is rotatably connected with a spiral bolt (12), the end of the clamping column (6) is fixedly connected with a fixing nut (17), and the spiral bolt (12) and the fixing nut (17) are threadedly connected.

5. A steel frame for tunnel cross adit transition excavation assistance according to claim 1, characterized in that: The outer side of the expansion block (11) is arranged in an arc cover shape, the outer arc surface of the separate plate (2) is fixedly connected with an embedded disc (7), a plurality of holes are formed in the outer surface of the embedded disc (7), and the end of the embedded disc (7) away from the separate plate (2) is arranged in a flat shape.

6. A steel frame for tunnel cross adit transition excavation assistance according to claim 3, characterized in that: The inner arc surface of the separation plate (2) is provided with an insertion slot (20), the inner side of the insertion slot (20) is slidably connected with an inclined plate (9), the inclined plate (9) is located at one end of a reinforcing rod (10), and a connecting assembly is arranged between the inclined plate (9) and the insertion slot (20).

7. A steel framework for use in the excavation of a transition section between a tunnel and a cross tunnel according to claim 6, wherein: The connecting assembly comprises a magnet, the magnet is located at the bottom end of the insertion slot (20), the inclined plate (9) is arranged in an inclined manner, and the end of the reinforcing rod (10) close to the inclined plate (9) is fixedly connected with a stop block (21), and the stop block (21) is arranged in an inclined manner.

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