An angle adjustment device for steel pipes in tunnel pipe roof construction

Abstract

This utility model discloses a steel pipe angle adjustment device for tunnel pipe roof construction, comprising a leveled ground, a tunnel pre-reinforcement zone, a steel pipe, a tunnel face, a steel pipe installation port, and an angle adjustment system foundation, a support system, and an adjustment system. The foundation includes fixing screws, washers, and nuts, with the support system connected to the top. The support system consists of an arc-shaped steel pipe and a transverse plate, which is movably embedded in a brake block. The adjustment system includes a fixing plate, a transverse movable shaft, etc., and the brake block has a fixing groove, etc. Precise adjustment and fixing of the steel pipe angle can be achieved through an angle scale, adapting to different steel pipes, facilitating installation and maintenance, improving construction accuracy and efficiency, reducing safety hazards, and is suitable for tunnel pipe roof construction.

Description

Technical Field

[0001] This utility model belongs to the field of steel pipes for tunnel construction pipe sheds, and in particular relates to an angle adjustment device for steel pipes used in tunnel construction pipe sheds. Background Technology

[0002] In the field of modern tunnel engineering construction, with the vigorous advancement of transportation infrastructure, tunnel projects under various complex geological conditions are constantly emerging. Pipe roof construction, as a crucial link in ensuring the safety and stability of tunnel construction, is becoming increasingly important. Pipe roof construction involves driving steel pipes along the tunnel axis outside the tunnel excavation outline to form an advanced support structure, providing reliable support for subsequent tunnel excavation operations. The precise adjustment of the steel pipe angle plays a decisive role in whether the pipe roof can fully exert its support effectiveness. Different geological conditions, such as weak surrounding rock, fault fracture zones, and water-rich strata, all require the pipe roof steel pipes to be installed at specific angles to effectively resist surrounding rock pressure, control surrounding rock deformation, and prevent tunnel collapse accidents. However, current pipe roof construction steel pipe angle adjustment technology has many shortcomings, seriously restricting the construction quality and efficiency of tunnel projects. From the perspective of equipment structure, traditional pipe roof construction equipment often directly connects the drill bit and the pipe roof for transmission, relying on the drill bit to drive the pipe roof into the tunnel. This connection method makes it difficult to pre-adjust the pipe roof to the designed drilling angle before drilling. When angle adjustments are needed, they are mostly achieved through visual inspection by construction workers using the overall installation foundation of mobile equipment. However, manual visual inspection is greatly affected by subjective factors, making accuracy difficult to guarantee. This approach is simply unacceptable when facing complex geological conditions and high-precision construction requirements. For example, in areas with weak surrounding rock, even slight deviations in the pipe roof angle can significantly reduce the support effect and increase the risk of tunnel collapse. The construction environment inside the tunnel also presents a significant challenge to adjusting the steel pipe angle.

[0003] CN205154174U discloses a pre-support construction structure for pipe roof tunnels in weak surrounding rock, including a drilling rig working chamber formed after the tunnel arch is excavated outward, a guide wall located at the front of the drilling rig working chamber, multiple orifice pipes pre-embedded in the guide wall, and a drilling rig and a grouting machine located in the drilling rig working chamber; the multiple orifice pipes are guide pipes for guiding multiple pipe roof pipes, and the pipe roof pipe includes a pipe body spliced ​​from multiple pipe sections and a drill bit coaxially installed at the front end of the pipe body, with multiple grouting holes on the drill bit; the front end of the drilling drive mechanism of the drilling rig is equipped with a connecting joint for connecting pipe sections, and the connecting joint is provided with a grouting interface, which is connected to the grouting port of the grouting machine through a grouting pipe. The constructed pre-support structure for pipe roof can effectively support tunnels in weak surrounding rock.

[0004] CN221856746U discloses an angle adjustment device for steel pipes in a tunnel pipe shed, comprising a steel frame, a vertical section and an arched section, the arched section being located at one end of the vertical section, a fixed plate being detachably installed on one side of the arched section of the steel frame, a support frame being provided on the fixed plate, a slider being slidably installed on the support frame, a driving component being provided on the support frame, and a fixed frame being provided on the support frame, with both sides of the fixed frame rotatably connected to the slider, a clamping sleeve being provided on the fixed frame, a rotating component being provided on the slider, and a locking component being provided on the slider. The fixed plate is installed on the steel frame. Before installing the steel pipe, the driving component is adjusted to move the slider and adjust the position of the fixed frame. Then, the rotating component is rotated to rotate the fixed frame and adjust the position of the clamping sleeve. The locking component is then used to lock the steel pipe. The steel pipe is then installed by passing it through the two clamping sleeves on the fixed frame. The angle of the steel pipe is adjusted by adjusting the vertical position of the fixed frame and by rotating the fixed frame.

[0005] During pipe roof drilling, a large amount of smoke and dust is generated, severely affecting the visibility of construction workers and making it difficult to accurately determine the actual position and angle of the pipe roof when manually adjusting the angle, leading to adjustment errors. Simultaneously, when the pipe roof enters the tunnel, the equipment experiences severe vibrations due to the strong resistance of the rock strata. If precision components such as angle sensors are installed on the equipment to assist in angle adjustment under these circumstances, these components are highly susceptible to vibration impacts, significantly shortening their service life and severely affecting measurement accuracy, resulting in inaccurate measurement data and an inability to provide reliable data for angle adjustment. Therefore, it is necessary to develop a steel pipe angle adjustment device for tunnel pipe roof construction, suitable for pipe roof construction auxiliary devices with different insertion angles, which will have significant economic and social benefits for construction units. Summary of the Invention

[0006] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a steel pipe angle adjustment device for tunnel pipe roof construction, comprising a leveled ground, a tunnel pre-reinforcement zone, a steel pipe, a tunnel face, a steel pipe installation port, an angle adjustment system foundation, an angle adjustment support system, and an angle adjustment system; the angle adjustment system foundation includes a fixing screw, a washer, and a nut; the angle adjustment support system includes an arc-shaped steel pipe and a transverse plate; the angle adjustment system comprises a fixed plate, a transverse movable shaft, a transverse movable shaft sliding area, an angle adjustment system position fixing shaft, a circular groove, a fixing shaft slot, a sleeve, and a circular rubber gasket. The system comprises an angle scale and an angle adjustment support system brake block, with the brake block having a fixing groove, fixing bolts, and fixing holes. A tunnel face is located on the leveled ground, behind which is the tunnel pre-reinforcement zone. Several steel pipe installation ports are opened along the circumference of the tunnel excavation at the edge of the tunnel face, through which steel pipes are driven into the tunnel pre-reinforcement zone. Angle adjustment system foundations are symmetrically installed on the leveled ground on both sides in front of the tunnel face, with the top of the foundations fixedly connected to the angle adjustment support system, and the angle adjustment support system movably embedded within the brake block.

[0007] As a further embodiment of this utility model: the base of the angle adjustment system is situated on a stable foundation, with its top surface level with the elevation of the leveled ground; four fixing screws are vertically and evenly embedded at the center of the top surface, each fixing screw passing upward through a washer on the top surface of the angle adjustment system base, and a nut is installed at the point where the fixing screws pass through the washer.

[0008] As a further embodiment of this utility model: the angle adjustment support system is composed of two arc-shaped steel pipes and a horizontal plate. The sum of the diameter of the two arc-shaped steel pipes and the length of the horizontal plate is adapted to the length of the fixing groove of the brake block of the angle adjustment support system. The arc-shaped steel pipes are located inside the fixing groove and correspond to the position of the fixing hole. The fixing bolts are rotated and assembled in the fixing hole.

[0009] As a further embodiment of this utility model: two fixed plates are vertically fixedly installed on the top surface of the brake block of the angle adjustment support system. A horizontal movable shaft sliding area is provided at the rear end of the horizontal center position of the two fixed plates, and the horizontal movable shaft can move back and forth within the horizontal movable shaft sliding area. The inner sides of the two horizontal movable shafts are respectively fixedly connected to the outer edge of the sleeve. A circular rubber pad is installed circumferentially on the outer edge of the inner side of the sleeve. An angle adjustment system position fixing shaft is provided at the front end of the horizontal center position of the two fixed plates. The angle adjustment system position fixing shaft is placed in the circular groove of the two fixed plates. An angle scale is provided at the rear side of the circular groove, and several fixed shaft slots communicating with the circular groove are provided at the front side. The length of the angle adjustment system position fixing shaft is greater than that of the horizontal movable shaft, and it can slide within the circular groove. The center position of the fixed shaft slot, the scale value of the angle scale, and the central axis of the horizontal movable shaft are on the same straight line, and the angle between the straight line and the horizontal line is consistent with the scale value of the angle scale.

[0010] As a further embodiment of this utility model: the center line of the sleeve is on the same straight line as the center of the steel pipe installation port, and the inserted steel pipe has a preset external insertion angle.

[0011] As a further aspect of this utility model, the inner diameter of the circular rubber gasket is precisely matched with the outer diameter of the steel pipe.

[0012] Compared with the prior art, the present invention has the following beneficial effects.

[0013] This device achieves precise control of the steel pipe insertion angle through an angle adjustment system. The angle scale and fixed shaft groove work together to ensure controllable angle error and improve the accuracy of pipe roof support. The sliding structure of the arc-shaped steel pipe and braking block facilitates quick angle adjustment, reducing construction time. The matching design of the circular rubber gasket and jacket enhances the stability of the steel pipe and prevents displacement during construction. The symmetrical foundation structure ensures the overall stability of the device, adapting to complex tunnel conditions. The coordinated operation of all components simplifies the operation process, improves construction efficiency, ensures the quality of pipe roof support, and reduces tunnel excavation risks, demonstrating significant practical value. Attached Figure Description

[0014] Figure 1 This is the front view of the present invention.

[0015] Figure 2 This is a side view of the working face perpendicular to the ground in this invention.

[0016] Figure 3 This is a side view of the working face tilted to the ground in this invention.

[0017] Figure 4 This is a top view of the present invention.

[0018] Figure 5 This is the basic main view of the angle adjustment system.

[0019] Figure 6 This is a top view of the basic angle adjustment system.

[0020] Figure 7 This is the main view of the angle adjustment support tube.

[0021] Figure 8 for Figure 1 Enlarged view of part B in the middle.

[0022] Figure 9 This is a top view of the angle adjustment system.

[0023] Figure 10 This is a side view of the angle adjustment system.

[0024] Figure 11 for Figure 8 Enlarged view of the side of the central fixing plate.

[0025] 1. Leveling the ground; 2. Tunnel pre-reinforcement zone; 3. Steel pipe; 4. Tunnel face; 5. Steel pipe installation port; 6. Angle adjustment system foundation; 61. Fixing screw; 62. Washer; 63. Nut; 7. Angle adjustment support system; 71. Arc-shaped steel pipe; 72. Transverse plate; 8. Angle adjustment system; 81. Fixing plate; 82. Transverse movable shaft; 83. Transverse movable shaft sliding area; 84. Angle adjustment system position fixing shaft; 841. Circular groove; 85. Fixing shaft slot; 86. Jacket; 87. Circular rubber pad; 88. Angle scale; 89. Angle adjustment support system brake block; 891. Fixing groove; 892. Fixing bolt; 893. Fixing hole. Detailed Implementation

[0026] This section will describe in detail the specific embodiments of the present invention. Preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and overall technical solution of the present invention, but they should not be construed as limiting the scope of protection of the present invention.

[0027] In this invention, when directions (up, down, left, right, front, and back) are described, it is only for the purpose of describing the technical solution of the invention, and does not indicate or imply that the technical features referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of the invention.

[0028] In this invention, unless otherwise explicitly defined, terms such as "set," "install," and "connect" should be interpreted broadly. For example, they can refer to direct connection or indirect connection through an intermediate medium; they can refer to fixed connection, detachable connection, or integral molding; they can refer to mechanical connection. Those skilled in the art can reasonably determine the specific meaning of the above terms in this invention based on the specific content of the technical solution.

[0029] like Figure 1-11 The device shown is a steel pipe angle adjustment device for tunnel pipe roof construction, comprising a leveled ground 1, a tunnel pre-reinforcement zone 2, a steel pipe 3, a tunnel face 4, a steel pipe installation port 5, an angle adjustment system foundation 6, an angle adjustment support system 7, and an angle adjustment system 8. The angle adjustment system foundation 6 includes a fixing screw 61, a washer 62, and a nut 63. The angle adjustment support system 7 includes an arc-shaped steel pipe 71 and a transverse plate 72. The angle adjustment system 8 consists of a fixed plate 81, a transverse movable shaft 82, a transverse movable shaft sliding area 83, an angle adjustment system position fixing shaft 84, a circular groove 841, a fixing shaft slot 85, a sleeve 86, a circular rubber gasket 87, an angle scale 88, and... Angle adjustment support system brake block 89 is formed, and angle adjustment support system brake block 89 is provided with fixing groove 891, fixing bolt 892 and fixing hole 893; a tunnel face 4 is provided on the leveled ground 1, and the tunnel pre-reinforcement area 2 is behind the tunnel face 4; several steel pipe installation ports 5 are opened along the circumference of the tunnel excavation at the edge of the tunnel face 4, and steel pipes 3 are driven into the tunnel pre-reinforcement area 2 through the steel pipe installation ports 5; angle adjustment system foundations 6 are symmetrically installed on the leveled ground 1 on both sides in front of the tunnel face 4, and the top of the angle adjustment system foundation 6 is fixedly connected to the angle adjustment support system 7, and the angle adjustment support system 7 is movably embedded in the angle adjustment support system brake block 89.

[0030] As a further embodiment of this utility model: the base of the angle adjustment system 6 is situated on a stable foundation, with its top surface level with the elevation of the leveled ground 1; four fixing screws 61 are vertically and evenly embedded at the center of the top surface, each fixing screw 61 passing upward through a washer 62 on the top surface of the angle adjustment system base 6, and a nut 63 is installed at the point where the fixing screw 61 passes through the washer 62.

[0031] As a further embodiment of this utility model: the angle adjustment support system 7 is composed of two arc-shaped steel pipes 71 and a horizontal plate 72. The sum of the diameter of the two arc-shaped steel pipes 71 and the length of the horizontal plate 72 is adapted to the length of the fixing groove 891 of the brake block 89 of the angle adjustment support system. The arc-shaped steel pipes 71 are located inside the fixing groove 891 and correspond to the position of the fixing hole 893. The fixing bolt 892 is rotatably assembled in the fixing hole 893.

[0032] As a further embodiment of this utility model: Two fixing plates 81 are vertically fixedly installed on the top surface of the brake block 89 of the angle adjustment support system. A transverse movable shaft sliding area 83 is provided at the rear end of the transverse center position of the two fixing plates 81, allowing the transverse movable shaft 82 to move back and forth within the transverse movable shaft sliding area 83. The inner sides of the two transverse movable shafts 82 are respectively fixedly connected to the outer edge of the sleeve 86. A circular rubber pad 87 is installed circumferentially along the outer edge of the inner side of the sleeve 86. An angle adjustment system position fixing shaft 84 is provided at the front end of the transverse center position of the two fixing plates 81. The position fixing shaft 84 of the angle adjustment system is placed in the circular groove 841 of the two fixing plates 81; an angle scale 88 is provided on the rear side of the circular groove 841, and several fixing shaft slots 85 communicating with the circular groove 841 are provided on the front side. The length of the position fixing shaft 84 of the angle adjustment system is greater than that of the transverse movable shaft 82, and it can slide in the circular groove 841; the center position of the fixing shaft slot 85, the scale value of the angle scale 88 and the central axis of the transverse movable shaft 82 are on the same straight line, and the angle between the straight line and the horizontal line is consistent with the scale value of the angle scale 88.

[0033] As a further embodiment of this utility model: the center line of the sleeve 86 is on the same straight line as the center of the steel pipe installation port 5, and the inserted steel pipe 3 has a preset external insertion angle.

[0034] As a further embodiment of this utility model, the inner diameter of the circular rubber pad 87 is precisely matched with the outer diameter of the steel pipe 3.

[0035] Working principle

[0036] When excavating the tunnel entrance, pipe roof support is required. The location of the steel pipe installation opening 5 at the tunnel face 4 is marked, and the leveled ground 1 serves as the base surface for the device installation, providing a flat and solid reference for the subsequent installation of various components. The base of the angle adjustment system foundation 6 rests on a stable foundation, and its top surface is flush with the leveled ground 1 to ensure good bonding between the foundation and the ground. At the center of the top surface of the angle adjustment system foundation 6, four vertically evenly embedded fixing screws 61 are pre-embedded. The fixing screws 61 pass upwards through the top washers 62, and then nuts 63 are installed at the points where they protrude from the washers 62. By tightening the nuts 63, the thread engagement between the nuts and screws, and the increased bearing area of ​​the washers 62, firmly fix the angle adjustment support system 7 to the angle adjustment system foundation 6, providing stable and reliable support for the entire angle adjustment device. This effectively prevents the device from shaking or shifting during subsequent construction processes such as driving in steel pipes, thus ensuring the accuracy of angle adjustment.

[0037] The angle adjustment support system 7 plays a crucial role in connecting the angle adjustment system base 6 and the angle adjustment system 8, while also providing initial position adjustment functionality. This system consists of two arc-shaped steel pipes 71 and a transverse plate 72. The sum of the diameters of the two arc-shaped steel pipes 71 and the length of the transverse plate 72 matches the length of the fixing groove 891 of the brake block 89 of the angle adjustment support system. This dimensional design ensures that the arc-shaped steel pipes 71 and the transverse plate 72 can slide within the fixing groove 891. When the position of the angle adjustment support system 7 needs to be adjusted, simply loosen the fixing bolts 892. Due to the arc shape of the arc-shaped steel pipes 71, they can slide to a certain extent within the fixing groove 891, thereby changing the position of the entire angle adjustment support system 7. After adjusting to the appropriate position, rotate the fixing bolt 892 into the fixing hole 893 and tighten it. Use the tightening force of the bolt to fix the arc-shaped steel pipe 71 in the current position, thereby realizing the adjustment of the height and horizontal position of the angle adjustment support system 7. This provides a suitable initial installation position and support state for the angle adjustment system 8, laying the foundation for subsequent more precise angle adjustment.

[0038] The angle adjustment system 8 is the core component of the entire device for achieving precise angle adjustment of the steel pipe. Its various components work together to set, adjust, and fix the angle. Two fixed plates 81 are vertically fixed to the top surface of the brake block 89 of the angle adjustment support system, providing mounting surfaces for other components. A transverse movable shaft sliding area 83 is located at the rear end of the transverse center of the two fixed plates 81, within which the transverse movable shaft 82 can move back and forth. The inner sides of the two transverse movable shafts 82 are fixedly connected to the outer edge of the sleeve 86, so when the transverse movable shaft 82 moves within the sliding area 83, it will cause the sleeve 86 to move back and forth as well. The centerline of the sleeve 86 is collinear with the center of the steel pipe installation opening 5. By adjusting the position of the transverse movable shaft 82, it can be ensured that the sleeve 86 is always aligned with the steel pipe installation opening 5, providing an accurate channel for the smooth passage of the steel pipe 3 and angle adjustment.

[0039] Regarding angle adjustment, an angle adjustment system position fixing shaft 84 is provided at the front end of the transverse center position of the two fixed plates 81. This fixing shaft is placed in the circular groove 841 of the two fixed plates 81, and its length is greater than that of the transverse movable shaft 82, allowing it to slide within the circular groove 841. An angle scale 88 is provided on the rear side of the circular groove 841, and several fixing shaft slots 85 communicating with the circular groove 841 are provided on the front side. The center position of the fixing shaft slots 85, the scale value of the angle scale 88, and the central axis of the transverse movable shaft 82 are on the same straight line, and the angle between this straight line and the horizontal line is consistent with the scale value of the angle scale 88. This key structural design is the core guarantee for achieving precise angle adjustment.

[0040] When the angle of steel pipe 3 needs to be adjusted, the operator first loosens the position fixing shaft 84 of the angle adjustment system, allowing it to slide freely within the circular groove 841. Then, according to the preset external insertion angle of the steel pipe required for construction, the operator observes the angle scale 88 and slides the position fixing shaft 84 of the angle adjustment system along the circular groove 841 to the corresponding scale position. Since the fixing shaft slot 85 is connected to the circular groove 841 and its position corresponds to the scale value, when the fixing shaft slides to the target scale, it is locked into the corresponding fixing shaft slot 85, thus fixing the position fixing shaft 84 of the angle adjustment system. At this time, the angle between the straight line formed by the central axis of the transverse movable shaft 82, the center of the fixing shaft slot 85, and the corresponding scale of the angle scale 88, and the horizontal line is the preset external insertion angle of the steel pipe, thereby accurately determining the angle of the steel pipe 3.

[0041] A circular rubber gasket 87 is circumferentially installed on the inner outer edge of the jacket 86, and the inner diameter of the circular rubber gasket 87 is precisely matched with the outer diameter of the steel pipe 3. When the steel pipe 3 passes through the jacket 86, the circular rubber gasket 87 tightly wraps around the steel pipe 3. On the one hand, the elasticity of the rubber material increases the friction between the steel pipe 3 and the jacket 86, preventing the steel pipe 3 from shifting axially or radially during insertion. On the other hand, the rubber gasket also provides a certain buffering protection for the steel pipe 3, avoiding hard contact between the jacket 86 and the steel pipe 3 that could damage the surface of the steel pipe.

[0042] After setting the angle and fixing the relevant components, the steel pipe 3 can be driven in. The steel pipe 3 is driven into the tunnel pre-reinforcement zone 2 through the clamp 86 and the steel pipe installation port 5 at the preset insertion angle. Throughout the driving process, because the angle adjustment system 8 precisely fixes the angle of the steel pipe 3, and the clamp 86 and the circular rubber gasket 87 provide stability and guidance, the steel pipe 3 maintains the preset angle and smoothly enters the tunnel pre-reinforcement zone 2, achieving effective pre-reinforcement of the tunnel and providing a safety guarantee for subsequent tunnel excavation.

[0043] The above is a detailed description of the preferred embodiments of the present utility model. However, the present utility model is not limited to the above embodiments. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present utility model. All such equivalent modifications or substitutions are included within the scope defined by the claims of this application.

Claims

1. A tunnel pipe roof construction steel pipe angle adjusting device, characterized in that The system includes a leveled ground (1), a tunnel pre-reinforcement area (2), a steel pipe (3), a tunnel face (4), a steel pipe installation port (5), an angle adjustment system foundation (6), an angle adjustment support system (7), and an angle adjustment system (8). The angle adjustment system foundation (6) includes a fixing screw (61), a washer (62), and a nut (63). The angle adjustment support system (7) includes an arc-shaped steel pipe (71) and a transverse plate (72). The angle adjustment system (8) consists of a fixed plate (81), a transverse movable shaft (82), a transverse movable shaft sliding area (83), an angle adjustment system position fixing shaft (84), a circular groove (841), a fixing shaft slot (85), a sleeve (86), a circular rubber pad (87), an angle scale (88), and an angle adjustment support. The system brake block (89) is composed of an angle adjustment support system brake block (89) and is provided with a fixing groove (891), a fixing bolt (892) and a fixing hole (893); the leveled ground (1) is provided with a tunnel face (4), and the tunnel face (4) is located behind the tunnel pre-reinforcement area (2); the edge of the tunnel face (4) is provided with several steel pipe installation ports (5) along the circumferential direction of the tunnel excavation, and the steel pipe (3) is driven into the tunnel pre-reinforcement area (2) through the steel pipe installation ports (5); the angle adjustment system foundation (6) is symmetrically installed on the leveled ground (1) on both sides in front of the tunnel face (4), the top of the angle adjustment system foundation (6) is fixedly connected to the angle adjustment support system (7), and the angle adjustment support system (7) is movably embedded in the angle adjustment support system brake block (89).

2. The angle adjustment device for steel pipes used in tunnel pipe roof construction according to claim 1, characterized in that... The base of the angle adjustment system foundation (6) is situated on a stable foundation, with its top surface level with the elevation of the leveled ground (1). Four fixing screws (61) are vertically and evenly embedded at the center of the top surface. Each fixing screw (61) passes through a gasket (62) on the top surface of the angle adjustment system foundation (6), and a nut (63) is installed at the point where the fixing screw (61) passes through the gasket (62).

3. The angle adjustment device for steel pipes used in tunnel pipe roof construction according to claim 1, characterized in that... The angle adjustment support system (7) consists of two arc-shaped steel pipes (71) and a horizontal plate (72). The sum of the diameter of the two arc-shaped steel pipes (71) and the length of the horizontal plate (72) is matched with the length of the fixing groove (891) of the brake block (89) of the angle adjustment support system. The arc-shaped steel pipes (71) are located inside the fixing groove (891) and correspond to the position of the fixing hole (893). The fixing bolt (892) is rotated and assembled in the fixing hole (893).

4. The angle adjustment device for steel pipes used in tunnel pipe roof construction according to claim 1, characterized in that... Two fixed plates (81) are vertically fixed on the top surface of the brake block (89) of the angle adjustment support system. The rear end of the two fixed plates (81) at the horizontal center position is provided with a horizontal movable shaft sliding area (83). The horizontal movable shaft (82) can move back and forth within the horizontal movable shaft sliding area (83). The inner sides of the two horizontal movable shafts (82) are respectively fixedly connected to the outer edge of the sleeve (86). A circular rubber pad (87) is installed circumferentially on the outer edge of the inner side of the sleeve (86). The front end of the two fixed plates (81) at the horizontal center position is provided with an angle adjustment system position fixing shaft (84). The angle adjustment system position fixing shaft is provided with a horizontal movable shaft (84). The shaft (84) is placed in the circular groove (841) of the two fixed plates (81); an angle scale (88) is provided on the rear side of the circular groove (841), and several fixed shaft slots (85) communicating with the circular groove (841) are provided on the front side. The length of the fixed shaft (84) of the angle adjustment system is greater than that of the transverse movable shaft (82), and it can slide in the circular groove (841). The center position of the fixed shaft slot (85), the scale value of the angle scale (88) and the center axis of the transverse movable shaft (82) are on the same straight line, and the angle between the straight line and the horizontal line is consistent with the scale value of the angle scale (88).

5. The angle adjustment device for steel pipes used in tunnel pipe roof construction according to claim 1, characterized in that... The centerline of the sleeve (86) is on the same straight line as the center of the steel pipe installation port (5), and the inserted steel pipe (3) has a preset external insertion angle.

6. The angle adjustment device for steel pipes in tunnel pipe roof construction according to claim 1, characterized in that... The inner diameter of the circular rubber gasket (87) is precisely matched with the outer diameter of the steel pipe (3).

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