Internal force adjusting device for arched cable-stayed structure

Abstract

The invention discloses an arch cable-stayed structure internal force adjusting device which is characterized in that a plurality of internal force adjusting basic units are fixedly installed in an arch box girder at equal intervals to form a plurality of adjusting cavities, and each internal force adjusting basic unit comprises two partition plates rotationally connected to the two ends of the corresponding adjusting cavity and two adjustable flexible pull rods arranged between the partition plates; the ends, close to each other, of the two flexible pull rods are rotationally connected to the same rotating disc. A rigid pull rod sleeved outside the two flexible pull rods is fixed in the box girder, a connecting shaft is rotatably arranged at the top of a bottom plate in the rigid pull rod through a bearing, a spline shaft is fixedly arranged at the top of the connecting shaft, and a turntable is fixedly sleeved on the spline shaft; the driving assembly is detachably arranged on the bottom plate and used for driving the rotating disc to rotate and tensioning the two flexible pull rods. The fixing mechanism is arranged at the bottom of the bottom plate and used for fixing the connecting shaft; according to the device, through unique shape and structure improvement, automation and precision of internal force adjustment are achieved, and the stress balance and safety of a bridge are remarkably improved.

Description

Technical Field

[0001] This invention belongs to the field of bridge construction technology and relates to an internal force adjustment device for an arched cable-stayed structure. Background Technology

[0002] Arch bridges, as a common type of bridge structure, have relatively mature design and construction technologies. However, with the increase in bridge span and the increasing complexity of the usage environment, various composite bridge systems have evolved. Among them, the arch cable-stayed structure places higher demands on internal force adjustment. In the construction and use of traditional cable-stayed structures, internal force adjustment often relies on complex tensioning equipment and manual operation, which not only increases the difficulty of construction but also raises maintenance costs. In addition, the uneven distribution of internal forces in the arch cable-stayed structure may also lead to uneven stress on the bridge structure, affecting the service life and safety of the bridge.

[0003] Currently, the adjustment of internal forces in arched cable-stayed structures mainly relies on external tensioning equipment. This method has the following limitations: First, the adjustment process requires precise measurement and calculation, which places high demands on the technical skills of the operators; second, the operation of external equipment may cause additional damage to the bridge structure; and finally, it is difficult to monitor and evaluate in real time whether the internal force distribution of the cable-stayed structure is uniform after adjustment. These problems not only increase the difficulty of construction and maintenance, but also limit the flexibility of bridge design and application. Summary of the Invention

[0004] In view of this, in order to solve the problems that existing arched cable-stayed structure internal force adjustment technology mainly relies on external tensioning equipment, which has the disadvantages of complicated operation, high technical requirements for personnel, potential damage to the structure, and difficulty in real-time monitoring of the internal force distribution of the arched cable-stayed structure, thus limiting the flexibility of bridge design and application, this invention provides an arched cable-stayed structure internal force adjustment device.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] An internal force adjustment device for an arched cable-stayed structure, wherein several basic internal force adjustment units are fixedly installed at equal intervals along the axial direction inside the box girder of the arch to form several adjustment chambers. Each basic internal force adjustment unit includes two partitions rotatably connected to both ends of the adjustment chamber and two adjustable flexible tie rods set between the partitions. The two flexible tie rods are rotatably connected to the same turntable at one end close to each other.

[0007] Rigid tie rods are fitted onto the outer walls of the two flexible tie rods. The rigid tie rods are fixed inside the box girder. A base plate is provided inside the rigid tie rods. A connecting shaft is rotatably mounted on the top of the base plate via a bearing. A spline shaft is fixedly mounted on the top of the connecting shaft. A turntable is fixedly fitted onto the spline shaft. A drive assembly is detachably mounted on the base plate and is used to drive the turntable to rotate and tension the two flexible tie rods. A fixing mechanism is located at the bottom of the base plate and is used to fix the connecting shaft.

[0008] Furthermore, the drive assembly includes two positioning plates inserted into the top of the base plate. The top of the positioning plates is provided with a rotating ring that rotates horizontally via a bearing. A hydraulic cylinder is fixed inside the rotating ring. A plug rod is welded to the output end of the hydraulic cylinder. Two first insertion holes are opened on the top of the turntable. The plug rod is L-shaped and its bottom end is inserted into the corresponding first insertion hole.

[0009] Furthermore, at least two support columns are fixedly installed through the top of the positioning plate, and a second insertion hole is opened on the top of the base plate to be inserted into the support columns. The top of the four support columns is welded with the same connecting strip.

[0010] Furthermore, the fixing mechanism includes a ratchet fixedly sleeved on the outer wall of the bottom end of the connecting shaft. Multiple annularly distributed connecting posts are welded to the bottom of the base plate. The outer wall of the connecting post is fitted with a pawl that meshes with the ratchet through a bearing. A torsion spring is fitted on the outer wall of the connecting post. The two ends of the torsion spring abut against the outer wall of the connecting post and the bottom of the pawl, respectively. The bottom of the second insertion hole is also provided with a limiting component that works with the positioning plate to limit the pawl again.

[0011] Furthermore, the limiting assembly includes two sliding rods. Two countersunk holes are opened at the top of the base plate, and the sliding rods pass through the countersunk holes. The bottom of the two sliding rods is welded with the same connecting ring coaxial with the connecting shaft. Multiple limiting plates that abut against the pawl are fixed on the inner wall of the connecting ring. Springs are sleeved on the outer wall of the sliding rods, and the two ends of the springs abut against the top wall of the countersunk hole and the top of the sliding rod, respectively.

[0012] Furthermore, a base is fixedly provided at the bottom of the connecting ring, and multiple positioning pins are fixedly provided at the top of the base. Multiple third insertion holes for insertion into the positioning pins are provided at the bottom of the ratchet.

[0013] Furthermore, the top of the rigid tie rod is provided with an inspection port, and a sealing door is hinged inside the inspection port, which is compatible with the connecting strip.

[0014] Furthermore, limit strips are welded to the inner walls of both sides of the rigid tie rod, and the base plate is located on top of the two limit strips.

[0015] Furthermore, a third rotating seat is fixedly provided at one end of the flexible tie rod, and the third rotating seat is rotatably mounted on the turntable via a second rotating shaft.

[0016] The beneficial effects of this invention are as follows:

[0017] 1. The internal force adjustment device for the arched cable-stayed structure disclosed in this invention uses a hydraulic cylinder as the power source for the drive component. The torque is transmitted through the L-shaped plug rod and the turntable. Combined with the axial positioning and circumferential transmission characteristics of the spline shaft, the backlash and wear problems of traditional gear transmission are eliminated. This ensures that the flexible tie rods on both sides are tensioned synchronously and the adjustment accuracy reaches the millimeter level. It can adapt to the dynamic adjustment needs of the internal force of the arched cable-stayed structure under different working conditions and significantly improve the stress balance during bridge operation.

[0018] 2. The internal force adjustment device for the arched cable-stayed structure disclosed in this invention features a flexible tie rod connected to a guide rod at both ends via rotating seats. This allows the tie rod to rotate freely and slide axially under load, effectively absorbing bridge vibration energy and reducing stress concentration. The sliding fit design between the guide rod and the fixed seat further enhances the fatigue resistance of the tie rod and extends the service life of the internal force adjustment system.

[0019] 3. The internal force adjustment device for the arched cable-stayed structure disclosed in this invention achieves self-locking through the unidirectional engagement of the ratchet and pawl in the fixing mechanism, preventing internal force relaxation caused by external impact or hydraulic system failure. The limiting component drives the limiting plate through the sliding rod and spring to perform secondary limiting on the pawl. At the same time, the chassis positioning pin is inserted into the ratchet hole to form a mechanical-physical double locking, which can resist the impact of extreme loads (such as earthquakes and overloaded vehicles) and ensure the long-term stability of the internal force of the arched cable-stayed structure. In addition, through the redundant design of ratchet and pawl self-locking and limiting pin insertion, even if a single locking mechanism fails, the other mechanism can still independently assume the locking function, which significantly improves the fault tolerance and safety of the device.

[0020] Other advantages, objectives, and features of the invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination, or may be learned from practice of the invention. The objectives and other advantages of the invention can be realized and obtained through the following description. Attached Figure Description

[0021] To make the objectives, technical solutions, and advantages of the present invention clearer, the preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, wherein:

[0022] Figure 1 This is a schematic diagram of the installation of the internal force adjustment device for the arched cable-stayed structure of the present invention;

[0023] Figure 2 For the present invention Figure 1 Schematic diagram of the basic unit for internal force adjustment;

[0024] Figure 3 For the present invention Figure 2 Schematic diagram of the basic unit for adjusting internal forces without rigid tie rods;

[0025] Figure 4 For the present invention Figure 3 Schematic diagram of the installation structure of the connecting strip and hydraulic cylinder;

[0026] Figure 5 For the present invention Figure 3 Sectional view of the bottom plate;

[0027] Figure 6 For the present invention Figure 5 Schematic diagram of the pawl and ratchet structure;

[0028] Figure 7 For the present invention Figure 3 Schematic diagram of a medium-rigidity tie rod structure.

[0029] Reference numerals: 1. Box girder; 2. Partition plate; 3. Fixed seat; 4. Guide rod; 5. First rotating seat; 6. Rigid tie rod; 7. Inspection port; 8. Sealing door; 9. First rotating shaft; 10. Second rotating seat; 11. Flexible tie rod; 12. Third rotating seat; 13. Second rotating shaft; 14. Hydraulic cylinder; 15. Turntable; 16. Positioning plate; 17. Support column; 18. Connecting strip; 19. Insert rod; 20. Rotating ring; 21. Connecting shaft; 22. Splined shaft; 23. First insertion hole; 24. Ratchet; 25. Connecting column; 26. Pawl; 27. Connecting ring; 28. Countersunk hole; 29. ​​Sliding rod; 30. Spring; 31. Chassis; 32. Limiting plate; 33. Base plate; 34. Second insertion hole; 35. Torsion spring; 36. Third insertion hole; 37. Positioning pin; 38. Limiting strip. Detailed Implementation

[0030] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention.

[0031] like Figure 1 The diagram shows an internal force adjustment device for an arched cable-stayed structure. The arched cable-stayed structure is designed in the shape of a banyan tree. The upper structure is a hollow steel box girder. The upper box girder 1 is fixedly installed on the bridge deck and the support, providing a supporting foundation for the entire device.

[0032] Several such welds are made at equal intervals along the axial direction inside box girder 1. Figure 2 The shown internal force adjustment basic unit forms several adjustment chambers. Each internal force adjustment basic unit includes two partition plates 2 rotatably connected to both ends of the adjustment chamber, with the distance between adjacent partition plates 2 set at 1.2 meters. Figure 3Two flexible tie rods 11 are symmetrically arranged in each adjustment chamber. The flexible tie rods 11 are made of 32mm diameter alloy steel stranded wire with an anti-corrosion coating. The tensile strength of a single tie rod is not less than 1860MPa. A third rotating seat 12 is fixed to one end of each flexible tie rod 11, and a Zemic BM14C-C3-20t-15B tension sensor is embedded between the flexible tie rod 11 and the third rotating seat 12. This sensor can collect tension data in real time and transmit it to the control system, forming a closed-loop control circuit of "monitoring-adjustment-feedback". The sensor's range covers 0-2000kN with an accuracy of ±0.3%. Combined with the millisecond-level response speed of the hydraulic drive system, the third rotating seat 12 is rotatably mounted on the turntable 15 via a second rotating shaft 13. The second rotating shaft 13 is made of 40Cr alloy steel and has undergone heat treatment, achieving a surface hardness of HRC45, allowing the flexible tie rod 11 to rotate around the turntable 15 at a certain angle.

[0033] The other end of the flexible tie rod 11 is fixedly provided with a second rotating seat 10. Inside the second rotating seat 10, a first rotating seat 5 is rotatably provided via a first rotating shaft 9. Two guide rods 4 are slidably provided through one side of the first rotating seat 5. Both ends of the two guide rods 4 are fixed to one side of the partition plate 2 via fixed seats 3. This allows the flexible tie rod 11 to extend, retract, and rotate within a certain range to meet the needs of adjusting the internal forces of the arched cable-stayed structure.

[0034] Two flexible tie rods 11 are externally fitted with rigid tie rods 6. The rigid tie rods 6 are made of Q345B steel pipe with a wall thickness of 10 mm, providing protection and support for the flexible tie rods 11, and can bear force simultaneously with the flexible tie rods. The rigid tie rods 6 have a base plate 33 inside. The base plate 33 is made of 45# steel through precision machining and has a thickness of 30 mm. The top of the base plate 33 is rotatably connected to a connecting shaft 21 via a bearing. The top of the connecting shaft 21 is fixedly fitted with a splined shaft 22. The turntable 15 is fixedly fitted onto the splined shaft 22 by full welding, so that the turntable 15 can rotate stably on the base plate 33 through the connecting shaft 21 and the splined shaft 22.

[0035] like Figure 4 The drive assembly shown is detachably mounted on the base plate 33 and is used to drive the turntable 15 to rotate, thereby tensioning the two flexible tie rods 11. The drive assembly includes two positioning plates 16 inserted into the top of the base plate 33. The top of the positioning plates 16 is provided with a rotating ring 20 that rotates horizontally via bearings. A hydraulic cylinder 14 is fixed inside the rotating ring 20. The hydraulic cylinder 14 has a rated working pressure of 21 MPa and a stroke of 150 mm. A plug rod 19 is welded to the output end of the hydraulic cylinder 14. The top of the turntable 15 has two first insertion holes 23. The plug rod 19 is L-shaped and the bottom end of the plug rod 19 is machined with an R3 rounded corner to form a clearance fit with the first insertion holes 23 on the top of the turntable 15.

[0036] At least two support columns 17 with a diameter of 25 mm are fixedly installed through the top of the positioning plate 16. The top of the base plate 33 has a second insertion hole 34 for inserting into the support columns 17, with the fitting clearance controlled at 0.02-0.05 mm. The tops of the four support columns 17 are welded with the same connecting strip 18.

[0037] When the internal force adjustment device for the arched cable-stayed structure is in operation, the positioning plate 16 is first inserted into the base plate 33 to ensure that the support column 17 is firmly inserted into the second insertion hole 34, and at the same time, the insertion rod 19 is inserted into the first insertion hole 23. Then, the hydraulic cylinder 14 is activated, and the output end of the hydraulic cylinder 14 drives the insertion rod 19 to move, thereby driving the turntable 15 to rotate. The rotation of the turntable 15 drives the two flexible tie rods 11 to be tensioned or relaxed, thereby adjusting the internal force of the cable-stayed structure.

[0038] like Figure 5 The fixing mechanism shown is located at the bottom of the base plate 33 and is used to fix the connecting shaft 21 to prevent the turntable 15 from rotating after adjustment. The fixing mechanism includes a ratchet 24 fixedly sleeved on the outer wall of the bottom end of the connecting shaft 21. The ratchet 24 is made of 40Cr and has undergone carburizing and quenching treatment. Multiple annularly distributed connecting posts 25 are welded to the bottom of the base plate 33. The outer wall of the connecting post 25 is rotatably sleeved with a pawl 26 that meshes with the ratchet 24 via a bearing. Each connecting post 25 has an outer diameter of 12 mm and a hard chrome plated surface. Each connecting post 25 is fitted with a torsion spring 35 with a wire diameter of 2 mm. The two ends of the torsion spring 35 abut against the outer wall of the connecting post 25 and the bottom of the pawl 26, respectively.

[0039] During operation, when the turntable 15 rotates, causing the connecting shaft 21 and ratchet 24 to rotate, the pawl 26 remains engaged with the ratchet 24 under the action of the torsion spring 35, preventing the ratchet 24 from rotating back.

[0040] To further enhance the fixing effect, a limiting component is also provided. The limiting component includes two sliding rods 29. Two countersunk holes 28 are opened at the top of the base plate 33. The sliding rods 29 are inserted through the countersunk holes 28. The bottom of the two sliding rods 29 is welded with the same connecting ring 27 coaxial with the connecting shaft 21. The inner wall of the connecting ring 27 is fixed with a plurality of limiting plates 32 that abut against the pawl 26. The outer wall of the sliding rods 29 is fitted with springs 30. The two ends of the springs 30 abut against the top wall of the countersunk hole 28 and the top of the sliding rod 29, respectively.

[0041] When the positioning plate 16 is in use, the sliding rod 29 is pressed down. The sliding rod 29 drives the connecting ring 27 and the limiting plate 32 to move downwards, moving the limiting plate 32 away from the pawl 26. At the same time, when the connecting shaft 21 rotates, the pawl 26 remains engaged with the ratchet 24 under the action of the torsion spring 35, preventing the ratchet 24 from rotating back. When the positioning plate 16 is removed, the sliding rod 29 can return to its original position under the force of the spring 30, causing the limiting plate 32 to move closer to the pawl 26 and be located on one side of the pawl 26, thus limiting the pawl 26 and preventing the pawl 26 from disengaging from the ratchet 24 under vibration.

[0042] like Figure 6 As shown, a base 31 is fixedly mounted on the bottom of the connecting ring 27, and a plurality of positioning pins 37 are fixedly mounted on the top of the base 31. A plurality of third insertion holes 36 are opened on the bottom of the ratchet 24 for inserting into the positioning pins 37. When the connecting ring 27 moves downward, the positioning pins 37 move away from the third insertion holes 36, and vice versa, they move upward, which can further fix the ratchet 24 and the connecting shaft 21.

[0043] The rigid tie rod 6 has an inspection port 7 at its top, and a sealing door 8 is hinged inside the inspection port 7. The inspection port 7 is compatible with the connecting strip 18, which facilitates the inspection and maintenance of the drive components and fixing mechanism inside the rigid tie rod 6.

[0044] like Figure 7 As shown, limit strips 38 are welded to the inner walls of both sides of the rigid tie rod 6. The base plate 33 is located on top of the two limit strips 38 to prevent the base plate 33 from shaking or shifting inside the rigid tie rod 6, and to prevent the chassis 31 from hitting the bottom wall of the rigid tie rod 6, thus providing sufficient space for adjustment.

[0045] During installation, the box girder 1 is hoisted onto the support frame on the bridge deck using a crane, and the partition plate 2 is welded into the box girder 1.

[0046] When the internal force of the arched cable-stayed structure needs to be adjusted, the sealing door 8 is opened, and the positioning plate 16 is placed on the base plate 33. During the placement process, the support column 17 is aligned with the second insertion hole 34. At the same time, the positioning plate 16 can be used to press the sliding rod 29 to move downward. The downward movement of the sliding rod 29 can drive the connecting ring 27 to move downward, so that the limiting plate 32 and the corresponding pawl 26 are moved away, and the base plate 31 is moved downward, so that the positioning pin 37 is disengaged from the third insertion hole 36. Continuing to be placed downward, the insertion rod 19 can be inserted into the first insertion hole 23.

[0047] The external hydraulic station is activated, which drives the rotating ring 20 to extend. During the extension of the rotating ring 20, the insertion rod 19 can be moved. The movement of the insertion rod 19 can drive the turntable 15 to rotate. During the rotation, the flexible tie rod 11 can be stretched. The tension of the flexible tie rod 11 can be adjusted until the value displayed by the tension sensor in the second rotating seat 10 reaches the preset value. At this time, the pawl 26 can be reset and rotated under the force of the torsion spring 35, so that it is locked in the ratchet 24.

[0048] Pulling the connecting bar 18 upwards allows the support column 17 to drive the positioning plate 16 upwards until the support column 17 disengages from the second insertion hole 34. At this point, the sliding rod 29 moves upwards under the force of the spring 30, driving the connecting ring 27 upwards. This causes the limiting plate 32 to abut against one side of the pawl 26 and drives the chassis 31 upwards, allowing the positioning pin 37 to insert into the corresponding third insertion hole 36 to further limit the ratchet 24.

[0049] Until the connecting strip 18 is disengaged from the rigid tie rod 6, the sealing door 8 is closed to seal the inspection port 7; the above method is used to adjust the multiple flexible tie rods 11 in sequence. After the adjustment is completed, the rigid tie rod 6 is welded into the box girder 1.

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. An internal force adjusting device for an arch cable-stayed structure, characterized by, The arch box girder (1) is fixedly installed with a plurality of internal force adjusting basic units along the axial direction at equal intervals to form a plurality of adjusting chambers, each internal force adjusting basic unit comprises two baffle plates (2) rotatably connected at both ends of the adjusting chamber and two flexible pull rods (11) adjustably arranged between the baffle plates (2), and the two flexible pull rods (11) are rotatably connected at one end to the same rotating disc (15); The outer sleeve of the two flexible pull rods (11) is provided with a rigid pull rod (6), the rigid pull rod (6) is fixed in the box girder (1), the rigid pull rod (6) is internally provided with a bottom plate (33), the top of the bottom plate (33) is rotatably provided with a connecting shaft (21) through a bearing, the top of the connecting shaft (21) is fixedly provided with a spline shaft (22), and the rotating disc (15) is fixedly sleeved on the spline shaft (22); A driving assembly is detachably arranged on the bottom plate (33) and used for driving the rotating disc (15) to rotate and tension the two flexible pull rods (11); and a fixing mechanism is arranged at the bottom of the bottom plate (33) and used for fixing the connecting shaft (21).

2. The internal force adjusting device for an arch cable-stayed structure according to claim 1, wherein The driving assembly comprises two positioning plates (16) inserted at the top of the bottom plate (33), the top of each positioning plate (16) is horizontally rotatably provided with a rotating ring (20) through a bearing, the rotating ring (20) is fixedly provided with a hydraulic cylinder (14) inside, the output end of the hydraulic cylinder (14) is welded with a plug rod (19), the top of the rotating disc (15) is provided with two first insertion holes (23), and the plug rod (19) is L-shaped and inserted at the bottom end into the corresponding first insertion hole (23).

3. The internal force adjusting device for an arch cable-stayed structure according to claim 2, wherein At least two supporting columns (17) are fixedly arranged at the top of each positioning plate (16), the top of the bottom plate (33) is provided with second insertion holes (34) into which the supporting columns (17) are inserted, and the top of each of the four supporting columns (17) is welded with the same connecting strip (18).

4. The internal force adjusting device for an arch cable-stayed structure according to claim 3, wherein The fixing mechanism comprises a ratchet wheel (24) fixedly sleeved at the bottom end outer wall of the connecting shaft (21), a plurality of connecting columns (25) are welded at the bottom of the bottom plate (33) and arranged in an annular and uniform manner, the outer wall of each connecting column (25) is rotatably sleeved with a pawl (26) engaged with the ratchet wheel (24) through a bearing, the outer wall of each connecting column (25) is sleeved with a torsional spring (35), the two ends of the torsional spring (35) are respectively in contact with the outer wall of the connecting column (25) and the bottom of the pawl (26), and the bottom of each second insertion hole (34) is further provided with a limiting assembly used in cooperation with the positioning plate (16) to limit the pawl (26) again.

5. The internal force adjusting device for an arch cable-stayed structure according to claim 4, wherein The limiting assembly comprises two sliding rods (29), two counterbores (28) are formed at the top of the bottom plate (33), the sliding rods (29) are arranged in the counterbores (28) and penetrate through the counterbores (28), the bottom of each sliding rod (29) is welded with the same connecting ring (27) coaxial with the connecting shaft (21), the inner wall of the connecting ring (27) is fixedly provided with a plurality of limiting plates (32) in contact with the pawl (26), the outer wall of each sliding rod (29) is sleeved with a spring (30), and the two ends of the spring (30) are respectively in contact with the top wall of the counterbores (28) and the top end of the sliding rod (29).

6. The internal force adjusting device for an arch cable-stayed structure according to claim 5, wherein The bottom of the connecting ring (27) is fixedly provided with a bottom disc (31), the top of the bottom disc (31) is fixedly provided with a plurality of positioning pins (37), and the bottom of the ratchet wheel (24) is provided with a plurality of third insertion holes (36) for inserting the positioning pins (37).

7. The internal force adjusting device for an arch cable-stayed structure according to claim 3, wherein The top of the rigid pull rod (6) is provided with an inspection opening (7), the inspection opening (7) is hingedly provided with a sealing door (8), and the inspection opening (7) is matched with the connecting strip (18).

8. The internal force adjusting device for an arch cable-stayed structure according to claim 1, wherein The rigid pull rod (6) is welded with a limiting strip (38) on the inner wall of each side, and the bottom plate (33) is located on the top of the two limiting strips (38).

9. The internal force adjusting device for an arch cable-stayed structure according to claim 1, wherein The end of the flexible pull rod (11) close to the bottom plate (33) is fixedly provided with a third rotating seat (12), and the third rotating seat (12) is rotatably arranged on the rotating disc (15) through a second rotating shaft (13).

10. The internal force adjusting device for an arch cable-stayed structure according to claim 9, wherein The end of the flexible pull rod (11) away from the bottom plate (33) is fixedly provided with a second rotating seat (10), the second rotating seat (10) is rotatably provided with a first rotating seat (5) through a first rotating shaft (9), and the first rotating seat (5) is provided with two guide rods (4) which are slidably arranged on one side of the first rotating seat (5) and fixedly arranged on one side of the partition plate (2) through a fixing seat (3). The end of the flexible pull rod (11) away from the bottom plate (33) is fixedly provided with a second rotating seat (10), the second rotating seat (10) is rotatably provided with a first rotating seat (5) through a first rotating shaft (9), and the first rotating seat (5) is provided with two guide rods (4) which are slidably arranged on one side of the first rotating seat (5) and fixedly arranged on one side of the partition plate (2) through a fixing seat (3).

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