A U-shaped arch structure with adjustable span and height

Abstract

The application discloses a U-shaped arch structure with adjustable span and height applied to the field of tunnels, which is convenient to disassemble, transport and install through adjustable connecting pieces, fixed connecting pieces and a center hinged piece, improves the flexibility of the deployment of the U-shaped arch, realizes the height adjustment of arch support leg rods through the adjustable connecting pieces, is convenient to quickly adjust the span of the arch through the center hinged piece with a threaded cylinder and a screw rod, further improves the adaptability of the arch to different use scenarios, realizes accurate adjustment through a pointer disc and a scale disc, and through friction plates one and two arranged on the pointer disc and the scale disc respectively and the extrusion of a nut, load transmission between a hinged shaft and a side wing plate is realized through the friction plates one and two, stress concentration of the center hinged piece on the threaded cylinder and the screw rod when being stressed is avoided, and the structural stability of the center hinged piece and the arch is improved.

Description

Technical Field

[0001] This invention relates to the field of tunnel support, and in particular to a U-shaped arch frame structure with adjustable span and height. Background Technology

[0002] The U-shaped arch frame for tunnel support is made of high-strength steel bent into a U-shaped section. It is connected to adjacent arch frames through connecting plates to form a continuous support system that conforms to the tunnel outline. Its core function is to passively bear the deformation pressure of the surrounding rock through a high-rigidity structure, transforming concentrated loads into arc-shaped distributed forces and effectively controlling the expansion of the plastic zone. At the same time, it can also form a composite support with anchor bolts and shotcrete to actively mobilize the self-supporting capacity of the surrounding rock and reduce the amount of materials used.

[0003] Existing U-shaped arch frames typically adopt a fixed steel structure design, with their height and span parameters determined during the manufacturing stage. When encountering scenarios with large geological variations (such as the junction of soft and hard rock), changes in tunnel cross-sectional dimensions (such as the construction of transition sections), or local collapse treatment, it is necessary to adapt the parameters by replacing arch frame components of different specifications (such as standard sections, extended sections, or adjustment blocks). Replacing components is not only cumbersome but also consumes a lot of time. Summary of the Invention

[0004] 1. Technical problems to be solved

[0005] To address the cumbersome operation of adjusting the height and span of existing U-shaped arch frames, this invention provides a U-shaped arch frame structure with adjustable span and height.

[0006] 2. Technical Solution

[0007] To solve the above problems, the present invention adopts the following technical solution.

[0008] An adjustable span and height U-shaped arch frame structure includes an arch frame body. The arch frame body includes a pair of symmetrical rod assemblies and a central hinge member disposed on the upper part of the pair of rod assemblies, enabling the pair of rod assemblies to be hinged together. The rod assembly includes a support rod, a middle rod, and an arc rod. The upper end of the support rod is fixedly connected to the middle rod through an adjustable connector, and the upper end of the middle rod is fixedly connected to the arc rod through a fixed connector. The adjustable connector includes a connecting sleeve and multiple positioning bolts. The connecting sleeve is sleeved on the outside of the support rod and the middle rod. The support rod has multiple linearly equidistant positioning holes I, the middle rod has multiple linearly equidistant positioning holes II, and the connecting sleeve has multiple linearly equidistant positioning holes III.

[0009] The central hinge includes a symmetrically arranged left and right insert sleeves. The outer ends of both the left and right insert sleeves are fixedly connected to the upper end of the arc-shaped rod. A central wing plate is fixedly connected to the inner end of the left insert sleeve. A hinge shaft extending to both sides of the central wing plate is fixedly connected to the central wing plate. A pair of side wing plates are rotatably connected to both ends of the hinge shaft. The end of the side wing plate away from the hinge shaft is fixedly connected to the inner end of the right insert sleeve. An adjustment assembly is provided below the left and right insert sleeves. The adjustment assembly includes a right hinge member fixedly connected to the right insert sleeve. A screw is fixedly connected to the movable end of the right hinge member. A threaded cylinder is threadedly connected to the screw. The movable end of the threaded cylinder away from the screw is rotatably connected to the movable end of the left hinge member. The upper end of the left hinge member is fixedly connected to the lower end of the left insert sleeve.

[0010] As a further improvement of the present invention, the fixed connector includes a fixed sleeve and multiple fixed bolts. The upper end of the intermediate rod is provided with multiple fixing holes one, the lower end of the arc-shaped rod is provided with multiple fixing holes two, and the fixed sleeve is provided with multiple fixing holes three.

[0011] As a further improvement of the present invention, the outrigger rod, intermediate rod, arc rod, connecting sleeve and fixing sleeve are all made of U-shaped steel. The upper part of the outrigger rod and the lower part of the intermediate rod are inserted into the inner side of the connecting sleeve, and the upper part of the intermediate rod and the lower part of the arc rod are inserted into the inner side of the fixing sleeve.

[0012] As a further improvement of the present invention, both the left and right plug sleeves have plug grooves at their outer ends, and the upper end of the arc-shaped rod is inserted into the plug groove. The left plug sleeve has a locking bolt 1 for fixing the arc-shaped rod, and the right plug sleeve has a locking bolt 2 for fixing the arc-shaped rod.

[0013] As a further improvement of the present invention, the threaded cylinder includes a prism rod with an internal threaded cavity that mates with a screw. The left end of the prism rod is rotatably connected to a rotating seat that is fixedly connected to a left hinge. A prismatic cylinder is slidably connected to the outside of the prism rod. A plurality of circumferentially evenly distributed insertion rods are fixedly connected to the left side wall of the prismatic cylinder. A limiting plate is fixedly connected to the left side of the prismatic cylinder. The limiting plate has a through hole for the insertion rod to pass through. A locking hole for the insertion rod to be inserted is opened on the side wall of the rotating seat facing the limiting plate. A limiting ring is fixedly connected to the right end of the prism rod. A spring sleeved on the prism rod is abutted against the inner side wall of the limiting ring. A receiving cavity for accommodating the spring is opened on the right side of the prismatic cylinder. The spring abuts against the inner wall of the left end of the receiving cavity. The diameter of the limiting ring is smaller than the diameter of the receiving cavity.

[0014] As a further improvement of the present invention, the right hinge and the left hinge have the same structure, both of which include a fixed base and a rotating block, and the rotating block is rotatably connected to the fixed base.

[0015] As a further improvement of the present invention, the longitudinal cross-sections of both the prism rod and the prism tube are regular polygons, and the prism tube can slide along the axial direction of the prism rod. The two are circumferentially limited by the regular polygonal cross-sections.

[0016] As a further improvement of the present invention, the hinge shaft extends to the outer side of the side wing plates on both sides, and a scale is fixedly connected to the outer wall of the side wing plates. Wedge blocks are engaged at both ends of the hinge shaft, and a pointer disk sleeved on the hinge shaft is slidably connected to the wedge blocks. A nut that is threadedly connected to the outer end of the hinge shaft is abutted on the outer side of the pointer disk.

[0017] As a further improvement of the present invention, a friction plate 1 is fixedly connected to the inner wall of the pointer dial facing the scale dial, and a friction plate 2 is fixedly connected to the scale dial and is disposed opposite to the friction plate 1.

[0018] As a further improvement of the present invention, the pointer dial, scale dial, friction plate one, and friction plate two are all annular structures and are concentrically arranged along the axis of the hinge shaft. The inner wall of the pointer dial is provided with a through groove for the wedge block to slide.

[0019] 3. Beneficial Effects

[0020] Compared with the prior art, the advantages of this invention are:

[0021] (1) The present invention makes the U-shaped arch frame easy to disassemble, transport and install through adjustable connectors, fixed connectors and central hinges, thereby improving the flexibility of U-shaped arch frame deployment. In addition, the height of the arch frame support rods can be adjusted through adjustable connectors, thereby realizing the adjustment of the arch frame height. Furthermore, the central hinge with threaded cylinder and screw facilitates quick adjustment of the arch frame height, further improving the adaptability of the arch frame to different usage scenarios and improving the practicality and ease of operation of the arch frame.

[0022] (2) The present invention uses a pointer dial and a scale dial to facilitate real-time observation of the rotation angle of the central hinge during adjustment, thereby achieving precise adjustment. By using friction plates one and two respectively set on the pointer dial and the scale dial, the load is transferred between the hinge shaft and the side wing plate through the compression of the nut. This avoids stress concentration on the threaded cylinder and screw when the central hinge is under force, thereby improving the structural stability of the central hinge and thus improving the overall structural stability and load-bearing capacity of the arch frame. Attached Figure Description

[0023] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0024] Figure 2 This is a schematic diagram of a partial explosion structure of the present invention;

[0025] Figure 3 This is a three-dimensional structural diagram of the central hinge member in this invention;

[0026] Figure 4 This is a schematic diagram of the transverse cross-sectional structure of the central hinge member in this invention;

[0027] Figure 5 This is a schematic diagram of the transverse cross-sectional structure of the adjustment component in this invention;

[0028] Figure 6 This is an exploded structural diagram of the threaded cylinder in this invention;

[0029] Figure 7 This is an exploded assembly diagram of the pointer dial and scale dial in this invention;

[0030] Figure 8 This is a longitudinal sectional view of the central hinge component in this invention.

[0031] Figure 9 for Figure 8 A magnified structural diagram of point A in the middle.

[0032] Explanation of the numbers in the diagram: 1. Outrigger rod; 101. Positioning hole one; 2. Intermediate rod; 201. Positioning hole two; 202. Fixing hole one; 3. Arc-shaped rod; 301. Fixing hole two; 4. Adjustable connector; 401. Connecting sleeve; 402. Positioning bolt; 403. Positioning hole three; 5. Fixed connector; 501. Fixing sleeve; 502. Fixing bolt; 503. Fixing hole three; 6. Center hinge; 7. Left insert sleeve; 8. Right insert sleeve; 9. Locking bolt one; 10. Locking bolt two; 11. Center wing plate; 12. Hinge shaft; 13. Side wing plate; 14. 15. Insertion slot; 16. Screw; 17. Threaded cylinder; 18. Prismatic rod; 19. Internal threaded cavity; 20. Prismatic cylinder; 21. Insertion rod; 22. Limiting plate; 13. Through hole; 14. Rotating seat; 15. Locking hole; 16. Spring; 17. Receiving cavity; 18. Limiting ring; 19. Right hinge; 20. Fixed seat; 21. Rotating block; 22. Left hinge; 23. Scale; 24. Pointer; 25. Wedge block; 26. Nut; 27. Friction plate one; 28. Friction plate two. Detailed Implementation

[0033] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0034] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0035] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0036] Example 1

[0037] Please see Figures 1-6 In one embodiment of the present invention, a U-shaped arch frame structure with adjustable span and height includes an arch frame body. The arch frame body includes a pair of symmetrical rod assemblies and a central hinge 6 disposed on the upper part of the pair of rod assemblies and causing the pair of rod assemblies to be hingedly connected. The rod assembly includes a support rod 1, a middle rod 2 and an arc rod 3. The upper end of the support rod 1 is fixedly connected to the middle rod 2 through an adjustable connector 4, and the upper end of the middle rod 2 is fixedly connected to the arc rod 3 through a fixed connector 5.

[0038] Please see Figure 2 The adjustable connector 4 includes a connecting sleeve 401 and multiple positioning bolts 402. The connecting sleeve 401 is sleeved on the outside of the support leg rod 1 and the intermediate rod 2. The support leg rod 1 has multiple linearly equidistant positioning holes 101, the intermediate rod 2 has multiple linearly equidistant positioning holes 201, and the connecting sleeve 401 has multiple linearly equidistant positioning holes 403.

[0039] Please see Figure 2 , Figure 3 and Figure 4The central hinge 6 includes a symmetrically arranged left insert sleeve 7 and a right insert sleeve 8. The outer ends of both the left insert sleeve 7 and the right insert sleeve 8 are fixedly connected to the upper end of the arc-shaped rod 3. The inner end of the left insert sleeve 7 is fixedly connected to a central wing plate 11. The central wing plate 11 is fixedly connected to a hinge shaft 12 extending to both sides of it. A pair of side wing plates 13 are rotatably connected to both ends of the hinge shaft 12. The end of the side wing plate 13 away from the hinge shaft 12 is fixedly connected to the inner end of the right insert sleeve 8. An adjustment assembly is provided below the left insert sleeve 7 and the right insert sleeve 8. The adjustment assembly includes a right hinge 17 fixedly connected to the right insert sleeve 8. The movable end of the right hinge 17 is fixedly connected to a screw 15. The screw 15 is threadedly connected to a threaded cylinder 16. The movable end of the threaded cylinder 16 away from the screw 15 is rotatably connected to the movable end of the left hinge 18. The upper end of the left hinge 18 is fixedly connected to the lower end of the left insert sleeve 7.

[0040] Specifically, during the arch frame assembly, the adjustable connector 4 is used to connect and fix the outrigger rod 1 and the intermediate rod 2. During underground operations, to ensure the stability of the connection, the three surfaces of the connecting sleeve 401 that contact the outrigger rod 1 and the intermediate rod 2 need to be fixed with bolts. For simplicity of illustration, in... Figure 2 The corresponding positioning hole 3 is omitted from the diagram. The intermediate rod 2 and the arc rod 3 are connected and fixed by the fixing connector 5. During downhole operation, after the fixing connector 5 connects the intermediate rod 2 and the arc rod 3, it is necessary to further fix them by fixing cable. The fixing cable is a commercially available cable and is not protected by this patent, so it is not shown in the figure. The rod assembly is hinged by the central hinge connector 6. During installation, the height of the arch frame can be adjusted by changing the relative positions of the connecting sleeve 401, the outrigger rod 1 and the intermediate rod 2, as well as the positions of the multiple positioning bolts 402. In addition, during installation, the relative positions of the threaded cylinder 16 and the screw 15 are changed by screwing the threaded cylinder 16, thereby changing the included angle between the left insertion sleeve 7 and the right insertion sleeve 8, and thus changing the span of the arch frame. The adjustment is convenient and the operation is simple.

[0041] Compared to traditional tunnel supports, this invention, through adjustable connector 4, fixed connector 5, and central hinge 6, makes the U-shaped arch frame easy to disassemble, transport, and install, improving the flexibility of U-shaped arch frame deployment. In addition, the adjustable connector 4 enables height adjustment of the arch frame leg rod 1, thereby achieving arch frame height adjustment. Furthermore, the central hinge 6, equipped with threaded cylinder 16 and screw 15, facilitates quick adjustment of the arch frame height, further improving the arch frame's adaptability to different usage scenarios and enhancing its practicality and ease of operation.

[0042] Please see Figure 2 The fixed connector 5 includes a fixed sleeve 501 and multiple fixed bolts 502. The upper end of the intermediate rod 2 is provided with multiple fixing holes 202, the lower end of the arc rod 3 is provided with multiple fixing holes 301, and the fixed sleeve 501 is provided with multiple fixing holes 503.

[0043] Specifically, the intermediate rod 2 and the arc-shaped rod 3 are fixedly connected by the fixing sleeve 501 and multiple fixing bolts 502.

[0044] Please see Figure 2 The outrigger rod 1, intermediate rod 2, arc rod 3, connecting sleeve 401 and fixing sleeve 501 are all made of U-shaped steel. The upper part of the outrigger rod 1 and the lower part of the intermediate rod 2 are inserted into the inner side of the connecting sleeve 401, and the upper part of the intermediate rod 2 and the lower part of the arc rod 3 are inserted into the inner side of the fixing sleeve 501.

[0045] Specifically, by using connecting sleeves 401 and fixing sleeves 501 made of U-shaped steel, the overall strength of the arch frame is improved by using both plug-in connection and bolt fixing methods.

[0046] Please see Figure 4 Both the left and right insert sleeves 7 and 8 have insertion slots 14 at their outer ends. The upper end of the arc rod 3 is inserted into the insertion slot 14. The left insert sleeve 7 has a locking bolt 9 for fixing the arc rod 3, and the right insert sleeve 8 has a locking bolt 10 for fixing the arc rod 3.

[0047] Specifically, the left and right plug sleeves 7 and 8, which have plug slots 14, enable quick connection between the central hinge 6 and the two arc-shaped rods 3, facilitating disassembly and assembly.

[0048] Please see Figure 4 , Figure 5 and Figure 6 The threaded cylinder 16 includes a prism rod 1601, an internal threaded cavity 1602 that mates with the screw 15 is provided inside the prism rod 1601, a rotating seat 1607 that is fixedly connected to the left hinge 18 is rotatably connected to the left end of the prism rod 1601, a prism cylinder 1603 is slidably connected to the outside of the prism rod 1601, a plurality of circumferentially evenly distributed insertion rods 1604 are fixedly connected to the left side wall of the prism cylinder 1603, a limiting plate 1605 is fixedly connected to the prism rod 1601 on the left side of the prism cylinder 1603, a through hole 1606 for the insertion rod 1604 to pass through is provided on the limiting plate 1605, and a locking hole 1608 for the insertion rod 1604 to be inserted is provided on the side wall of the rotating seat 1607 facing the limiting plate 1605.

[0049] Please see Figure 5 and Figure 6 A limiting ring 1611 is fixedly connected to the right end of the prism rod 1601. A spring 1609 sleeved on the prism rod 1601 is abutted against the inner wall of the limiting ring 1611. A receiving cavity 1610 for accommodating the spring 1609 is opened on the right side of the prism tube 1603. The spring 1609 abuts against the inner wall of the left end of the receiving cavity 1610. The diameter of the limiting ring 1611 is smaller than the diameter of the receiving cavity 1610.

[0050] Specifically, when the span of the arch frame needs to be adjusted, the operator holds the prismatic cylinder 1603 and pushes it towards the screw 15, causing the insertion rod 1604 to disengage from the locking hole 1608. Then, the operator rotates the prismatic cylinder 1603, which drives the prism rod 1601 to rotate. The prism rod 1601 drives the screw 15 to move, causing the central hinge 6 to change angle, thereby adjusting the span of the arch frame. After the adjustment is completed, the operator holds the prismatic cylinder 1603 and moves it away from the screw 15, causing the insertion rod 1604 to be inserted into the locking hole 1608. The insertion of the insertion rod 1604 into the locking hole 1608 locks the prism rod 1601, preventing the screw 15 from loosening and improving the stability of the arch frame structure.

[0051] Please see Figure 5 The right hinge 17 and the left hinge 18 have the same structure. Both include a fixed base 1701 and a rotating block 1702, and the rotating block 1702 is rotatably connected to the fixed base 1701.

[0052] It should be noted that the rotating seat 1607 is fixedly connected to the rotating block 1702 of the left hinge 18, and the screw 15 is fixedly connected to the rotating block 1702 of the right hinge 17.

[0053] Please see Figure 6 Both the prism rod 1601 and the prism tube 1603 have regular polygonal cross sections in the longitudinal direction. The prism tube 1603 can slide along the axial direction of the prism rod 1601. The two are circumferentially limited by the regular polygonal cross sections.

[0054] Specifically, when the rotating rod of the prism cylinder 1603 is held, the prism cylinder 1603 drives the prism rod 1601 to rotate.

[0055] Example 2

[0056] Based on Example 1, please refer to Figure 7 , Figure 8 and Figure 9 The hinge shaft 12 extends to the outer side of the side wing plates 13 on both sides. A scale 19 is fixedly connected to the outer wall of the side wing plate 13. A wedge block 21 is snapped into both ends of the hinge shaft 12. A pointer disk 20 sleeved on the hinge shaft 12 is slidably connected to the wedge block 21. A nut 22 that is threadedly connected to the outer end of the hinge shaft 12 is abutted against the outer side of the pointer disk 20.

[0057] Specifically, when adjusting the span of the arch frame and screwing the threaded cylinder 16, the hinge shaft 12 and the side wing plate 13 rotate relative to each other. The hinge shaft 12 drives the pointer disk 20 to rotate synchronously. The scale 19 fixed on the side wing plate 13 makes it easy to observe the rotation angle of the hinge shaft 12, thus facilitating precise adjustment.

[0058] Please see Figure 7 and Figure 9 A friction pad 23 is fixedly connected to the inner wall of the pointer dial 20 facing the scale dial 19, and a friction pad 24 is fixedly connected to the scale dial 19 opposite to the friction pad 23.

[0059] Specifically, after the arch span adjustment is completed, screw on nut 22. Nut 22 pushes pointer dial 20 to move towards dial 19, so that friction plate 1 23 and friction plate 24 come into contact. When the arch is under stress, the load is transferred between hinge shaft 12 and side wing plate 13 through friction plate 1 23 and friction plate 24, avoiding the force of the central hinge 6 being concentrated on threaded cylinder 16 and screw 15, improving the structural stability of the central hinge 6, and thus improving the structural stability of the arch.

[0060] Please see Figure 7 and Figure 9 The pointer dial 20, scale dial 19, friction plate 1 23, and friction plate 2 24 are all annular structures and are concentrically arranged along the axis of the hinge shaft 12. The inner wall of the pointer dial 20 has a through groove for the wedge block 21 to slide.

[0061] Specifically, the pointer dial 20 is circumferentially limited by the wedge block 21. When the nut 22 is not tightened, the hinge shaft 12 rotates, causing the pointer dial 20 to rotate. When the nut 22 tightens the pointer dial 20, it axially limits the pointer dial 20.

[0062] The above description is merely a preferred embodiment of the present invention; however, the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and its improved concepts, should be covered within the scope of protection of the present invention.

Claims

1. A U-shaped arch frame structure with adjustable span and height, characterized in that, The system includes an arch frame body, which includes a pair of symmetrical rod assemblies and a central hinge (6) located on the upper part of the pair of rod assemblies and hinged to connect the pair of rod assemblies. The rod assembly includes a leg rod (1), a middle rod (2), and an arc rod (3). The upper end of the leg rod (1) is fixedly connected to the middle rod (2) through an adjustable connector (4), and the upper end of the middle rod (2) is fixedly connected to the arc rod (3) through a fixed connector (5). The adjustable connector (4) includes a connecting sleeve (401) and multiple positioning bolts (402). The connecting sleeve (401) is sleeved on the outside of the leg rod (1) and the middle rod (2). The leg rod (1) has multiple linearly equidistant positioning holes one (101), the middle rod (2) has multiple linearly equidistant positioning holes two (201), and the connecting sleeve (401) has multiple linearly equidistant positioning holes three (403). The central hinge (6) includes a symmetrically arranged left insert sleeve (7) and a right insert sleeve (8). The outer ends of both the left insert sleeve (7) and the right insert sleeve (8) are fixedly connected to the upper end of the arc-shaped rod (3). The inner end of the left insert sleeve (7) is fixedly connected to a central wing plate (11). The central wing plate (11) is fixedly connected to a hinge shaft (12) extending to both sides of it. A pair of side wing plates (13) are rotatably connected to both ends of the hinge shaft (12). The end of the side wing plate (13) away from the hinge shaft (12) is connected to the right insert sleeve (7). 8) The inner end is fixedly connected; the left plug sleeve (7) and the right plug sleeve (8) are provided with an adjustment component below. The adjustment component includes a right hinge (17) fixedly connected to the right plug sleeve (8). The movable end of the right hinge (17) is fixedly connected to a screw (15). The screw (15) is threadedly connected to a threaded cylinder (16). The end of the threaded cylinder (16) away from the screw (15) is rotatably connected to the movable end of the left hinge (18). The upper end of the left hinge (18) is fixedly connected to the lower end of the left plug sleeve (7).

2. The U-shaped arch frame structure with adjustable span and height according to claim 1, characterized in that, The fixed connector (5) includes a fixed sleeve (501) and multiple fixed bolts (502). The upper end of the intermediate rod (2) is provided with multiple fixing holes one (202), the lower end of the arc rod (3) is provided with multiple fixing holes two (301), and the fixed sleeve (501) is provided with multiple fixing holes three (503).

3. The U-shaped arch frame structure with adjustable span and height according to claim 1, characterized in that, The outrigger rod (1), intermediate rod (2), arc rod (3), connecting sleeve (401) and fixing sleeve (501) are all made of U-shaped steel. The upper part of the outrigger rod (1) and the lower part of the intermediate rod (2) are inserted into the inner side of the connecting sleeve (401), and the upper part of the intermediate rod (2) and the lower part of the arc rod (3) are inserted into the inner side of the fixing sleeve (501).

4. The U-shaped arch frame structure with adjustable span and height according to claim 1, characterized in that, Both the left insert sleeve (7) and the right insert sleeve (8) have insert grooves (14) at their outer ends. The upper end of the arc rod (3) is inserted into the insert groove (14). The left insert sleeve (7) has a locking bolt (9) for fixing the arc rod (3) through it, and the right insert sleeve (8) has a locking bolt (10) for fixing the arc rod (3) through it.

5. The U-shaped arch frame structure with adjustable span and height according to claim 1, characterized in that, The threaded cylinder (16) includes a prism rod (1601), with an internal threaded cavity (1602) inside the prism rod (1601) that mates with the screw (15). A rotating seat (1607) fixedly connected to the left hinge (18) is rotatably connected to the left end of the prism rod (1601). A prismatic cylinder (1603) is slidably connected to the outside of the prism rod (1601). Multiple insertion rods (1604) evenly distributed in a circular pattern are fixedly connected to the left sidewall of the prismatic cylinder (1603). A limiting plate (1605) is fixedly connected to the left side of the prismatic rod (1601) on the prismatic cylinder (1603). An insertion rod (1604) is provided on the limiting plate (1605). 4) A through hole (1606) is provided, and a locking hole (1608) for inserting the plug rod (1604) is provided on the side wall of the rotating seat (1607) facing the limiting plate (1605); the right end of the prism rod (1601) is fixedly connected to a limiting ring (1611), and the inner side wall of the limiting ring (1611) abuts against a spring (1609) sleeved on the prism rod (1601). The right side of the prism tube (1603) is provided with a receiving cavity (1610) for accommodating the spring (1609). The spring (1609) abuts against the inner wall of the left end of the receiving cavity (1610). The diameter of the limiting ring (1611) is smaller than the diameter of the receiving cavity (1610).

6. The U-shaped arch frame structure with adjustable span and height according to claim 1, characterized in that, The right hinge (17) and the left hinge (18) have the same structure. Both include a fixed base (1701) and a rotating block (1702), and the rotating block (1702) is rotatably connected to the fixed base (1701).

7. The U-shaped arch frame structure with adjustable span and height according to claim 5, characterized in that, The longitudinal sections of the prism rod (1601) and the prism tube (1603) are both regular polygons. The prism tube (1603) can slide along the axial direction of the prism rod (1601). The two are circumferentially limited by the regular polygonal sections.

8. The U-shaped arch frame structure with adjustable span and height according to claim 1, characterized in that, The hinge shaft (12) extends to the outer side of the side wing plates (13) on both sides. A dial (19) is fixedly connected to the outer wall of the side wing plate (13). A wedge block (21) is engaged at both ends of the hinge shaft (12). A pointer disk (20) sleeved on the hinge shaft (12) is slidably connected to the wedge block (21). A nut (22) threadedly connected to the outer end of the hinge shaft (12) is abutted on the outer side of the pointer disk (20).

9. A U-shaped arch frame structure with adjustable span and height according to claim 8, characterized in that, Friction pad one (23) is fixedly connected to the inner wall of the pointer disk (20) facing the scale disk (19), and friction pad two (24) is fixedly connected to the scale disk (19) opposite to friction pad one (23).

10. A U-shaped arch frame structure with adjustable span and height according to claim 9, characterized in that, The pointer disk (20), scale disk (19), friction plate one (23), and friction plate two (24) are all annular structures and are concentrically arranged along the axis of the hinge shaft (12). The inner wall of the pointer disk (20) is provided with a through groove for the wedge block (21) to slide.

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