Accurate positioning device for cable saddle of short tower stay cable and construction method

Abstract

The invention discloses a short tower stay cable saddle accurate positioning device and a construction method, the short tower stay cable saddle accurate positioning device comprises a jig frame and a cable saddle with a plurality of sets of fastening hoops, the jig frame is provided with three sets of bearing rods, the bearing rod located in the middle is higher than the bearing rods on the two sides, two opposite sets of fastening hoops are provided with lifting lugs, and the lifting lugs are connected with the cable saddle. An automatic positioning and locking unit is further arranged, installed on the bearing rod in the middle and used for positioning and locking the cable saddle. The cable saddle is accurately positioned and mounted on the jig frame through centering of the guide head and locking of the spring, the problem that the cable saddle cannot be accurately positioned and mounted during hoisting of a tower crane is solved, the cable saddle can be prevented from shifting due to vibration and shaking in the subsequent jig frame hoisting process through rigid connection of the positioning rod and the positioning hole after locking and fit supporting of the load bearing, and the cable saddle is prevented from being damaged. And the accuracy in the transportation process is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of cable saddle positioning technology for short towers, and particularly to a precise positioning device and construction method for cable saddles of short towers.

[0002] Background Technology: Low-tower cable-stayed bridges, as a bridge structure combining the advantages of both cable-stayed and beam bridges, are widely used in highway and railway construction. As the core load-bearing component of a low-tower cable-stayed bridge, the installation accuracy of the cable saddle directly determines the stress angle of the stay cables, the overall stress stability of the bridge, and its service life. Therefore, the precise positioning and stable installation of the cable saddle is a crucial process in the construction of low-tower cable-stayed bridges.

[0003] In the existing cable saddle installation process, the main method relies on lifting equipment such as tower cranes to directly lift the cable saddle to the predetermined installation position on the tower column. However, this construction method has the following significant technical defects.

[0004] First, when the tower crane is hoisting the cable saddle, it is impossible to place the cable saddle precisely in the predetermined position. It often requires multiple manual adjustments, which not only increases the construction period, but may also affect the positioning accuracy due to operational errors in the manual adjustment process. This can lead to deviations between the subsequent installation angle of the stay cable and the design value, increase the bending stress of the stay cable, and shorten its service life.

[0005] Second, there is no dedicated automatic positioning and locking mechanism. After the cable saddle is initially placed, it is necessary to manually install the locking parts to lock it, which is quite troublesome.

[0006] Therefore, this application provides a precise positioning device and construction method for cable saddles of short tower cable stays to meet the requirements. Summary of the Invention

[0007] The purpose of this application is to provide a precise positioning device and construction method for cable saddles of short tower cable stays, in order to solve the problems of inaccurate positioning and inability to automatically lock the cable saddles.

[0008] To achieve the above objectives, this application provides the following technical solution: a precise positioning device for cable saddles of a short tower cable stay, comprising a frame and a cable saddle with multiple sets of fastening clamps. The frame is provided with three sets of bearing rods, the height of the bearing rod in the middle being higher than the height of the bearing rods on both sides. The two sets of fastening clamps opposite each other are provided with lifting lugs. An automatic positioning and locking unit is also provided and installed on the middle bearing rod to achieve positioning and locking of the cable saddle.

[0009] In a preferred embodiment of this invention, the automatic positioning and locking unit includes a positioning pin with a frustum-shaped guide head at the lower end and a loop plate installed on the side end of the bearing rod. A positioning spring is installed on the loop plate, and the movable end of the positioning spring is connected to the positioning rod. The insertion end of the positioning rod passes through the loop plate and extends into the loop cavity of the loop plate. The upper end of the positioning rod located in the loop cavity is set to be inclined.

[0010] One set of the fastening clamps is installed in the middle of the cable saddle, the positioning pin is installed on the side end of the fastening clamp, and the position of the positioning pin is consistent with the position of the loop plate, and the position of the fastening clamp in the middle is consistent with the position of the bearing rod in the middle;

[0011] The upper center of the three sets of bearing rods is detachably equipped with a bearing plate, and the upper end of the bearing plate is arc-shaped. When the cable saddle is placed on the bearing plate, the arc-shaped surface of the bearing plate is in contact with the contact surface of the fastening clamp.

[0012] The lower end of the bearing rod is connected to the jig frame by two sets of reinforcing rods arranged symmetrically in a figure-eight shape;

[0013] The frame is equipped with lifting lugs for hoisting.

[0014] The bottom of each vertical rod of the frame is provided with a guide post with a frustum-shaped guide head at the lower end, and the upper end of the vertical rod is provided with a slot that matches the lower end of the guide post.

[0015] As a preferred embodiment of this invention, a longitudinal adjustment unit is also provided to longitudinally adjust the size of the jig to meet installation requirements, while ensuring that the cable saddle is always located at the center of the jig.

[0016] As a preferred embodiment of this invention, the longitudinal adjustment unit includes a bearing rod composed of a fixed tube and two sets of moving tubes;

[0017] The two sets of moving tubes are fixedly connected to the tire frame, and the ends of the two sets of moving tubes near the fixed tube are slidably disposed in the inner cavity of the fixed tube;

[0018] The inner cavity of the fixed tube is symmetrically provided with two sets of longitudinal screws along the axis of the fixed tube, and the two sets of longitudinal screws are respectively threadedly connected to nuts installed in the inner cavity of the moving tube. A first bevel gear is installed on the opposite end of the two sets of longitudinal screws, and the two sets of first bevel gears are meshed with a second bevel gear. The second bevel gear is rotatably mounted on the fixed tube through an adjusting shaft that passes through the fixed tube.

[0019] Two sets of connecting rods are provided at the lower end of the fixed tube located in the middle, and the movable ends of the two sets of connecting rods are connected to the fixed tubes on both sides respectively.

[0020] The lower end of the reinforcing rod is mounted on the jig, and the upper end of the reinforcing rod is equipped with a slider, which is slidably connected to the fixed tube.

[0021] As a preferred embodiment of this invention, a stabilization unit is also provided. By changing the length and tilt angle of the reinforcing rod, the load-bearing rod can still provide stable support to the cable saddle when the size of the jig changes.

[0022] As a preferred embodiment of this example, the stabilization unit includes a supporting screw and a reinforcing rod composed of a threaded tube, a coaxially mounted drive gear and a drive bevel gear, a transmission bevel gear mounted at the end of the supporting screw, and two sets of toothed plates disposed at the bottom of the fixed tube.

[0023] The driving bevel gear and the driving gear are coaxially rotatably disposed in the inner cavity of the U-shaped plate. Both ends of the U-shaped plate are fixed with connecting rods, and the outer ends of the connecting rods are rotatably connected to the slider. The axes of the two sets of connecting rods are on the same straight line as the axes of the driving bevel gear and the driving gear. The driving gear meshes with one of the sets of gear plates.

[0024] A first gear is mounted on the connecting rod on the left side, and the first gear meshes with a second gear rotatably mounted on the slider. The second gear meshes with another set of gear plates.

[0025] The upper end of the support screw is rotatably connected to the U-shaped plate, and the transmission bevel gear meshes with the drive bevel gear;

[0026] The lower end of the support screw is threadedly connected to the threaded pipe, the lower end of the threaded pipe is movably mounted on the movable block, and the movable block is slidably disposed between the two sets of limiting side plates.

[0027] The tire frame is provided with multiple sets of positioning holes from top to bottom, and the movable block is fixed to the tire frame by positioning bolts.

[0028] As a preferred embodiment of this invention, a displacement compensation unit is also provided to reduce the longitudinal movement distance of the slider 14.

[0029] As a preferred embodiment of this invention, the displacement compensation unit includes a damping screw rotatably mounted on the movable block and a damping rack vertically mounted on the frame.

[0030] The damping screw is threaded with a movable block, and rollers are installed on both ends of the movable block. A damping gear that meshes with the damping rack is installed on the end of the damping screw.

[0031] A construction method for a precise positioning device for a cable saddle of a short tower cable stay includes the following steps;

[0032] S1: First, adjust the dimensions of the jig on the construction platform as needed;

[0033] S2: Then, using hoisting equipment, the cable saddle is lifted and precisely positioned and installed onto the jig;

[0034] S3: Then, the entire jig is lifted onto the tower column using hoisting equipment, with the lower end of the jig docking with the embedded parts on the tower column;

[0035] S4: Repeat the above operation and dock the next tire frame with the previous tire frame.

[0036] In summary, the technical effects and advantages of this invention are as follows:

[0037] 1. The present invention has a reasonable structure. Through "guide head centering + spring locking", the cable saddle is accurately positioned and installed on the jig, which solves the problem of tower crane hoisting being unable to accurately position and place it. After locking, the rigid connection between the positioning rod and the positioning hole, together with the bearing support, can prevent the cable saddle from shifting due to vibration and shaking during the subsequent jig hoisting process, thus ensuring the accuracy during transportation.

[0038] 2. The invention also includes a longitudinal adjustment unit, which can flexibly adjust the longitudinal dimensions of the jig according to the tower column size, eliminating the need to customize multiple jigs and reducing construction costs.

[0039] Furthermore, during the adjustment process, the cable saddle is always centered to ensure that the frame will not tilt, twist, or sway violently due to the shift of the center of gravity when it is hoisted at high altitudes. This is especially suitable for bridge construction sites with strong winds and unstable air currents at high altitudes.

[0040] When the stay cables pass through the cable saddles of the split tubes, the saddles are set in the center to ensure that the angle of the stay cables is consistent with the design value, so as to avoid the increase of bending stress of the stay cables due to angle deviation, extend the service life of the stay cables, and at the same time ensure the overall stress stability of the low tower cable-stayed bridge.

[0041] 3. In this invention, a stabilization unit is also provided, which, by changing the length and tilt angle of the reinforcing rod, ensures that the bearing rod can still provide stable support to the cable saddle when the size of the jig changes.

[0042] 4. In this invention, a displacement compensation unit is also provided to reduce the longitudinal movement distance of the slider, so as to avoid the slider moving too fast, causing the support point of the reinforcing rod to be too far away from the axis of the fixed tube and thus unable to form a good and stable support for the fixed tube. Attached Figure Description

[0043] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0044] Figure 1 This is a schematic diagram showing the overall and partially enlarged structure of the present invention;

[0045] Figure 2 for Figure 1 Schematic diagram of the right-center view structure;

[0046] Figure 3 for Figure 1 Schematic diagram of the middle section and enlarged structure;

[0047] Figure 4 for Figure 1 A schematic diagram of the structure viewed from below in the middle section;

[0048] Figure 5 for Figure 4 Enlarged structural diagram at point A in the middle;

[0049] Figure 6 for Figure 4 Enlarged structural diagram at point B;

[0050] Figure 7 for Figure 3 Enlarged structural diagram at point C;

[0051] Figure 8 for Figure 3 A top-view cross-sectional diagram of the central fixed tube and the moving tube;

[0052] Figure 9 A schematic diagram of the structure for installing the support frame on the tower column;

[0053] Figure 10 This is a top-view cross-sectional structural diagram of the cross and T-shaped frame.

[0054] In the diagram: 1. Jig frame; 101. Cross; 102. T-shaped rod; 2. Bearing rod; 201. Fixed tube; 202. Moving tube; 203. Adjusting shaft; 204. Second bevel gear; 205. First bevel gear; 206. Longitudinal screw; 207. Nut; 3. Connecting rod; 4. Lifting lug; 5. Fastening clamp; 6. Positioning pin; 7. Reverse plate; 8. Positioning spring; 9. Positioning rod; 10. Bearing plate; 11. Cable saddle; 12. Reinforcing rod; 1201. Support screw; 1202. Threaded tube; 13. Movable block; 14. Sliding block; 15. U 16. Shaped plate; 17. Drive gear; 18. Drive bevel gear; 19. Transmission bevel gear; 20. Connecting rod; 21. First gear; 22. Second gear; 23. Limiting side plate; 24. Positioning bolt; 25. Moving block; 26. Roller; 27. Slowing screw; 28. Slowing rack; 29. ​​Slowing gear; 30. Guide bottom column; 31. Moving wheel; 32. Tower column; 33. Embedded part. Detailed Implementation

[0055] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0056] Example: Reference Figure 1-2 The device shown is a precise positioning device for cable saddles of a short tower cable stay, including a frame 1 and a cable saddle 11 with multiple sets of fastening clamps 5. The frame 1 is provided with three sets of bearing rods 2. The height of the bearing rod 2 in the middle is higher than that of the bearing rods 2 on both sides. The two sets of fastening clamps 5 opposite each other are provided with lifting lugs 4. An automatic positioning and locking unit is also provided and installed on the middle bearing rod 2 to realize the positioning and locking of the cable saddle 11.

[0057] As a preferred embodiment of this example, Figure 1-4 As shown, the automatic positioning and locking unit includes a positioning pin 6 with a frustum-shaped guide head at the lower end and a loop plate 7 installed on the side end of the bearing rod 2. A positioning spring 8 is installed on the loop plate 7, and the movable end of the positioning spring 8 is connected to the positioning rod 9. The insertion end of the positioning rod 9 passes through the loop plate 7 and extends into the loop cavity of the loop plate 7. The upper end of the positioning rod 9 located in the loop cavity is set to be inclined.

[0058] One set of the fastening clamps 5 is installed in the middle of the cable saddle 11, the positioning pin 6 is installed on the side end of the fastening clamps 5, and the position of the positioning pin 6 is consistent with the position of the loop plate 7. The position of the fastening clamps 5 in the middle is consistent with the position of the bearing rod 2 in the middle.

[0059] The upper center of the three sets of bearing rods 2 is detachably equipped with a bearing plate 10, and the upper end of the bearing plate 10 is arc-shaped. When the cable saddle 11 is placed on the bearing plate 10, the arc-shaped surface of the bearing plate 10 is in contact with the contact surface of the fastening clamp 5.

[0060] The lower end of the bearing rod 2 is connected to the frame 1 by two sets of reinforcing rods 12 arranged symmetrically in a figure-eight shape;

[0061] The frame 1 is equipped with lifting lugs 4 for hoisting;

[0062] The bottom of each vertical rod of the frame 1 is provided with a guide post 29 with a frustum-shaped guide head at the lower end, and the upper end of the vertical rod is provided with a slot that matches the lower end of the guide post 29.

[0063] In use, the saddle 11 is directly hoisted onto the jig 1 using hoisting equipment. During placement, the frustum-shaped guide head at the lower end of the positioning pin 6 is inserted into the arc-shaped cavity of the spiral plate 7. During the insertion process, the position of the saddle 11 is adjusted. When the positioning pin 6 moves downward, it abuts against the upper inclined surface of the positioning rod 9, causing the positioning rod 9 to compress the positioning spring 8. Finally, the insertion end of the positioning rod 9 is inserted into the positioning hole on the positioning pin 6 under the elastic force of the positioning spring 9 (at this time, the outer wall of the fastening clamp 5 abuts against the arc-shaped surface of the bearing plate 10 and bears pressure, and its arc-shaped surface also has a guiding effect on the saddle 11, which helps to promote the saddle 11 to be centered on the jig 1). The saddle 11 is finally located at the center of the bearing rod 2, that is, centered on the jig 1, and the two ends of the saddle 11 extend the same length beyond the bearing rods 2 on both sides, so that the saddle 11 is accurately positioned on the jig 1.

[0064] Then, the jig 1 is hoisted onto the tower column 31 using hoisting equipment. The tower column 31 is equipped with a pre-embedded part 32 that is compatible with the guide base column 29 (the upper end of which is equipped with a slot for the lower end of the guide base column 29). Then, the next jig 1 with the cable saddle 11 installed is hoisted onto the jig 1 on the previous tower column 31 using hoisting equipment, and so on.

[0065] By using "guide head centering + spring locking", the cable saddle 11 is precisely positioned and installed on the jig 1, solving the problem of tower cranes being unable to accurately place the cable.

[0066] After locking, the rigid connection between the positioning rod 9 and the positioning hole, together with the close support of the bearing plate 10, can prevent the cable saddle 11 from shifting due to vibration and shaking during the subsequent hoisting of the jig 1, thus ensuring the accuracy during transportation.

[0067] It should be noted that: First, multiple jigs 1 with cable saddles 11 installed can also be vertically installed together, and the jigs 1 can be welded or fixed together with bolts before being hoisted onto the tower column 31 as a whole; Second, the arc-shaped surface of the bearing plate 10 increases the contact area (distributes the weight of the cable saddle 11 and avoids local stress concentration that could cause component deformation), and the "centering effect" of the arc-shaped surface can help keep the cable saddle 11 centered, forming a double guarantee with the guiding function of the positioning column 5; Third, the setting of the guide column 29 facilitates the guiding installation of the two sets of jigs 1.

[0068] As a preferred embodiment of this invention, a longitudinal adjustment unit is also provided to adjust the size of the jig 1 longitudinally to meet installation requirements, while ensuring that the cable saddle 11 is always located at the center of the jig 1.

[0069] As a preferred embodiment of this example, Figure 2 , Figure 3 , Figure 8 As shown, the longitudinal adjustment unit includes a support rod 2 composed of a fixed tube 201 and two sets of moving tubes 202;

[0070] The two sets of moving tubes 202 are fixedly connected to the tire frame 1, and the ends of the two sets of moving tubes 202 near the fixed tube 201 are slidably disposed in the inner cavity of the fixed tube 201;

[0071] Two sets of longitudinal screws 206 are symmetrically arranged along the axis of the fixed tube 201 in the inner cavity, and the two sets of longitudinal screws 206 are respectively threadedly connected to nuts 207 installed in the inner cavity of the moving tube 202. A first bevel gear 205 is installed on the opposite end of the two sets of longitudinal screws 206, and the two sets of first bevel gears 205 are meshed with a second bevel gear 204. The second bevel gear 204 is rotatably mounted on the fixed tube 201 through an adjusting shaft 203 that passes through the fixed tube 201.

[0072] Two sets of connecting rods 3 are provided at the lower end of the fixed tube 201 located in the middle, and the movable ends of the two sets of connecting rods 3 are connected to the fixed tubes 201 on both sides respectively.

[0073] The lower end of the reinforcing rod 12 is mounted on the jig frame 1, and the upper end of the reinforcing rod 12 is mounted with a slider 14, which is slidably connected to the fixed tube 201.

[0074] A hexagonal block is installed on the outer end of the adjusting shaft 203. The adjusting shaft 203 can be rotated by using a hexagonal wrench. The first bevel gear 205 and the second bevel gear 204 work together to drive the two sets of longitudinal screws 206 to rotate, thereby causing the three sets of fixed tubes 201 to move outwards by the same amount at the same time (to ensure that the size of the jig 1 is adjusted evenly). Finally, the two sets of crosses 101 on the jig 1 move outwards, thereby changing the size of the jig 1 to adapt to different installation requirements. At the same time, the cable saddle 11 remains in the same position on the jig 1, that is, it is set in the center. When the crosses 101 move outwards, they will drive the slider 14 to move laterally outwards through the reinforcing rod 12, changing the support point of the upper end of the reinforcing rod 12.

[0075] This longitudinal adjustment unit can flexibly adjust the longitudinal dimension of the frame 1 according to the size of the tower column 31, eliminating the need to customize multiple sets of frame 1 and reducing construction costs.

[0076] Furthermore, during the adjustment process, the cable saddle 11 is always centered to ensure that the frame 1 will not tilt, twist or shake violently due to the shift of the center of gravity when it is hoisted at high altitudes. This is especially suitable for bridge construction sites with strong winds and unstable air currents at high altitudes.

[0077] When the stay cable passes through the cable saddle 11, the cable saddle 11 is centered to ensure that the angle of the stay cable is consistent with the design value, avoid the increase of bending stress of the stay cable due to angle deviation, extend the service life of the stay cable, and at the same time ensure the overall stress stability of the low tower cable-stayed bridge.

[0078] It should be noted that: 1. Adjustment is completed before the cable saddle 11 is placed; 2. A movable wheel 30 is installed at the lower end of the guide column 29, which facilitates the movement of the cross 101 during adjustment; 3. Two sets of longitudinal screws 206 are symmetrically arranged along the axis of the fixed tube 201, and their thread directions are opposite; 4. The connecting rod 3 is set to ensure that the three sets of fixed tubes 201 remain stationary during adjustment; 5. A lateral adjustment unit is set in the inner cavity of one set of crosses 101 and the two adjacent T-shaped rods 10 (see reference). Figure 10 Its lateral movement unit structure is as follows: Figure 8 The structures inside the fixed tube 201 and the moving tube 202 are the same. At the same time, the connecting rod 3 is set as a telescopic rod, which can adjust the frame 1 laterally through the lateral adjustment unit; sixth, the frame 1 is assembled from multiple sets of crosses 101 and T-shaped rods 102.

[0079] As a preferred embodiment of this invention, a stabilization unit is also provided. By changing the length and tilt angle of the reinforcing rod 12, the load-bearing rod 2 can still provide stable support to the cable saddle 11 when the size of the frame 1 changes.

[0080] When the cross 101 moves outward, it will change the support point of the reinforcing rod 12 on the fixed tube 201. Due to the change of the support point, the overall support structure strength of the frame 1 will decrease, and it will be unable to achieve stable bearing of the cable saddle 11. Therefore, a stabilization unit is set.

[0081] As a preferred embodiment of this example, Figure 4-6 As shown, the stabilization unit includes a reinforcing rod 12 consisting of a support screw 1201 and a threaded tube 1202, a drive gear 16 and a drive bevel gear 17 mounted coaxially, a transmission bevel gear 18 mounted at the end of the support screw 1201, and two sets of toothed plates disposed at the bottom of the fixed tube 201.

[0082] The drive bevel gear 17 and the drive gear 16 are coaxially rotatably disposed in the inner cavity of the U-shaped plate 15. Both ends of the U-shaped plate 15 are fixed with connecting rods 19, and the outer ends of the connecting rods 19 are rotatably connected to the slider 14. The axes of the two sets of connecting rods 19 are on the same straight line as the axes of the drive bevel gear 17 and the drive gear 16. The drive gear 16 meshes with one of the sets of gear plates.

[0083] A first gear 20 is mounted on the connecting rod 19 on the left side, and the first gear 20 meshes with a second gear 21 rotatably mounted on the slider 14. The second gear 21 meshes with another set of gear plates.

[0084] The upper end of the support screw 1201 is rotatably connected to the U-shaped plate 15, and the transmission bevel gear 18 is meshed with the drive bevel gear 17.

[0085] The lower end of the support screw 1201 is threadedly connected to the threaded tube 1202. The lower end of the threaded tube 1202 is movably mounted on the movable block 13, and the movable block 13 is slidably disposed between the two sets of limiting side plates 22.

[0086] The tire frame 1 is provided with multiple sets of positioning holes from top to bottom, and the movable block 13 is fixed on the tire frame 1 by positioning bolts 23.

[0087] When the cross 102 moves the slider 14 outward via the reinforcing rod 12, the U-shaped plate 15 rotates counterclockwise through the cooperation of the first gear 20, the second gear 21, and the toothed plate. At the same time, during the movement, the driving gear 16 cooperates with another set of toothed plates, causing the driving bevel gear 17 to drive the transmission bevel gear 18 to rotate, which in turn drives the support screw 1201 to rotate. The support screw 1201 extends outward continuously, causing the overall length of the reinforcing rod 12 to increase continuously. Finally, the movable block 13 moves downward under the resistance of the threaded tube 1202, thereby causing the overall tilt angle of the reinforcing rod 12 to decrease continuously (the relationship between the tilt angle and the support force: the smaller the tilt angle, the greater the axial component of the reinforcing rod 12, and the stronger the support stability). As the distance between the two sets of crosses 101 increases, the overall tilt angle of the reinforcing rod 12 decreases continuously, so as to achieve stable support of the cable saddle 11 by the reinforcing rod 12.

[0088] After completion, the movable block 13 can be fixed to the frame 1 using the positioning bolt 23;

[0089] When the adjusting shaft 203 is rotated in the opposite direction, the longitudinal screw 206 rotates in the opposite direction, the two sets of crosses 101 move relative to each other, the two sets of sliders 14 move relative to each other, and the overall length of the reinforcing rod 12 is constantly decreasing while its tilt angle is constantly increasing.

[0090] When the size of the jig frame 1 is adjusted, the reinforcing rod 12 provides sufficient radial support force to the bearing rod 2 through the synergistic effect of "increased length + decreased angle", thus avoiding insufficient rigidity and deformation of the jig frame 1 due to the increase in size.

[0091] It should be noted that, since the axes of the two sets of connecting rods 19 are arranged on the same straight line as the axes of the drive bevel gear 17 and the drive gear 16, the drive bevel gear 17 is always meshed with the transmission bevel gear 18, the drive gear 16 is always meshed with the gear plate, and the drive gear 20 is always meshed with the second gear 21 throughout the process.

[0092] As a preferred embodiment of this invention, a displacement compensation unit is also provided to reduce the longitudinal movement distance of the slider 14.

[0093] In actual use, when the cross 101 moves outward, it will synchronously drive the slider 14 to move outward. Their movement speed is consistent, which can easily cause the slider 14 to move too fast, resulting in the support point of the reinforcing rod 12 on the fixed tube 201 being too far away from the axis of the fixed tube 201, and thus failing to provide good and stable support for the fixed tube 201. Therefore, a movement damping unit is set.

[0094] As a preferred embodiment of this example, Figure 7As shown, the displacement compensation unit includes a damping screw 26 rotatably mounted on the movable block 13 and a damping rack 27 vertically mounted on the frame 1.

[0095] The damping screw 26 is threaded with a movable block 24, and rollers 25 are installed on both sides of the movable block 24. A damping gear 28 that meshes with the damping rack 27 is installed on the end of the damping screw 26.

[0096] When the movable block 13 moves downward (at this time, the cross 101 and the slider 14 move outward), the damping gear 28 and the damping rack 27 work together to drive the damping screw 26 to rotate. At this time, the movable block 24 moves away from the adjacent cross 101. The direction of movement of the movable block 24 is opposite to the direction of movement of the slider 14, and the lateral displacement of the movable block 24 per unit time is less than the lateral displacement of the movable tube 202 per unit time. At this time, the lateral displacement of the slider 14 per unit time is equal to the lateral displacement of the cross 101 per unit time minus the lateral displacement of the movable block 24 per unit time. By moving the movable block 24 to compensate for the lateral displacement, the moving speed of the slider 14 can be effectively reduced, thereby reducing its displacement per unit time. This avoids the slider 14 moving too fast, which would cause the support point of the reinforcing rod 12 to move too far away from the axis of the fixed tube 201 and fail to provide good and stable support for the fixed tube 201.

[0097] It should be noted that the optimal lateral displacement of the moving block 24 per unit time is equal to half of the lateral displacement of the moving tube 202 per unit time. At this time, the lateral displacement of the slider 14 is half of the lateral displacement of the moving tube 202, so that the support point of the reinforcing rod 12 is always located at a suitable support point position, which can form a good and stable support for the bearing rod 2.

[0098] A construction method for a precise positioning device for cable saddles of short-tower cable stays is characterized by the following steps;

[0099] S1: First, adjust the dimensions of the jig 1 on the construction platform as needed;

[0100] S2: Then, using hoisting equipment, the cable saddle 11 is lifted and precisely positioned and installed onto the jig 1;

[0101] S3: Then, the entire frame 1 is lifted onto the tower column 31 using hoisting equipment, with the lower end of the frame 1 connecting with the embedded part 32 on the tower column 31.

[0102] S4: Repeat the above operation and connect the next described tire frame 1 with the previous described tire frame 1.

[0103] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A precise positioning device for a cable saddle of a short tower cable stay, comprising a frame (1) and a cable saddle (11) with multiple sets of fastening clamps (5), wherein the frame (1) is provided with three sets of bearing rods (2), the height of the bearing rod (2) located in the middle is higher than the height of the bearing rods (2) on both sides, wherein the two sets of fastening clamps (5) opposite each other are provided with lifting lugs (4), characterized in that: An automatic positioning and locking unit is also provided, which is installed on the bearing rod (2) in the middle, for positioning and locking the cable saddle (11).

2. The precise positioning device for the cable saddle of a short tower cable stay according to claim 1, characterized in that: The automatic positioning and locking unit includes a positioning pin (6) with a frustum-shaped guide head at the lower end and a loop plate (7) installed on the side end of the bearing rod (2). A positioning spring (8) is installed on the loop plate (7), and the movable end of the positioning spring (8) is connected to the positioning rod (9). The insertion end of the positioning rod (9) passes through the loop plate (7) and extends into the loop cavity of the loop plate (7). The upper end of the positioning rod (9) located in the loop cavity is set to be inclined. One set of the fastening clamps (5) is installed in the middle of the cable saddle (11), the positioning pin (6) is installed on the side of the fastening clamps (5), and the position of the positioning pin (6) is consistent with the position of the spiral plate (7), and the position of the fastening clamps (5) in the middle is consistent with the position of the bearing rod (2) in the middle. The upper center of the three sets of bearing rods (2) is detachably equipped with a bearing plate (10), and the upper end of the bearing plate (10) is arc-shaped. When the cable saddle (11) is placed on the bearing plate (10), the arc surface of the bearing plate (10) is in contact with the contact surface of the fastening clamp (5). The lower end of the bearing rod (2) is connected to the frame (1) by two sets of reinforcing rods (12) arranged symmetrically in a figure-eight shape; The frame (1) is equipped with lifting lugs (4) for hoisting. The bottom of the vertical rod of the frame (1) is provided with a guide bottom post (29) with a frustum-shaped guide head at the lower end, and the upper end of the vertical rod is provided with a slot that matches the lower end of the guide bottom post (29).

3. The precise positioning device for the cable saddle of a short tower cable stay according to claim 2, characterized in that: It is also equipped with a longitudinal adjustment unit for longitudinally adjusting the size of the frame (1) to meet the installation requirements, while ensuring that the cable saddle (11) is always located at the center of the frame (1).

4. The precise positioning device for the cable saddle of a short tower cable stay according to claim 2, characterized in that: The longitudinal adjustment unit includes a support rod (2) consisting of a fixed tube (201) and two sets of moving tubes (202); The two sets of moving tubes (202) are fixedly connected to the frame (1), and the ends of the two sets of moving tubes (202) near the fixed tube (201) are slidably disposed in the inner cavity of the fixed tube (201); Two sets of longitudinal screws (206) are symmetrically arranged along the axis of the fixed tube (201) in the inner cavity of the fixed tube (201), and the two sets of longitudinal screws (206) are respectively threadedly connected to nuts (207) installed in the inner cavity of the moving tube (202). A first bevel gear (205) is installed on the opposite end of the two sets of longitudinal screws (206), and the two sets of first bevel gears (205) are meshed with a second bevel gear (204). The second bevel gear (204) is rotatably mounted on the fixed tube (201) through an adjusting shaft (203) that passes through the fixed tube (201). Two sets of connecting rods (3) are provided at the lower end of the fixed tube (201) located in the middle, and the movable ends of the two sets of connecting rods (3) are connected to the fixed tubes (201) on both sides respectively. The lower end of the reinforcing rod (12) is mounted on the jig (1), and the upper end of the reinforcing rod (12) is mounted with a slider (14), and the slider (14) is slidably connected to the fixed tube (201).

5. The precise positioning device for the cable saddle of a short tower cable stay according to claim 4, characterized in that: A stabilization unit is also provided, which changes the length and tilt angle of the reinforcing rod (12) to ensure that the bearing rod (2) can still provide stable support to the cable saddle (11) when the size of the frame (1) changes.

6. The precise positioning device for the cable saddle of a short tower cable stay according to claim 5, characterized in that: The stabilization unit includes a reinforcing rod (12) consisting of a support screw (1201) and a threaded tube (1202), a drive gear (16) and a drive bevel gear (17) mounted coaxially, a transmission bevel gear (18) mounted at the end of the support screw (1201), and two sets of toothed plates disposed at the bottom of the fixed tube (201). The drive bevel gear (17) and the drive gear (16) are coaxially rotatably disposed in the inner cavity of the U-shaped plate (15). Both ends of the U-shaped plate (15) are fixed with connecting rods (19), and the outer ends of the connecting rods (19) are rotatably connected to the slider (14). The axes of the two sets of connecting rods (19) are on the same straight line as the axes of the drive bevel gear (17) and the drive gear (16). The drive gear (16) meshes with one of the sets of gear plates. A first gear (20) is installed on the connecting rod (19) on the left side, and the first gear (20) meshes with a second gear (21) rotatably mounted on the slider (14), and the second gear (21) meshes with another set of gear plates; The upper end of the support screw (1201) is rotatably connected to the U-shaped plate (15), and the transmission bevel gear (18) meshes with the drive bevel gear (17). The lower end of the support screw (1201) is threadedly connected to the threaded tube (1202), the lower end of the threaded tube (1202) is movably mounted on the movable block (13), and the movable block (13) is slidably disposed between the two sets of limiting side plates (22). The tire frame (1) is provided with multiple sets of positioning holes from top to bottom, and the movable block (13) is fixed on the tire frame (1) by positioning bolts (23).

7. A precise positioning device for a cable saddle of a short tower cable stay according to claim 6, characterized in that: A displacement compensation unit is also provided to reduce the longitudinal movement distance of the slider (14).

8. The precise positioning device for the cable saddle of a short tower cable stay according to claim 7, characterized in that: The displacement compensation unit includes a damping screw (26) rotatably mounted on the movable block (13) and a damping rack (27) vertically mounted on the frame (1). The damping screw (26) is threaded with a moving block (24), and rollers (25) are installed on both sides of the moving block (24). A damping gear (28) that meshes with the damping rack (27) is installed on the end of the damping screw (26).

9. The construction method of the precise positioning device for the cable saddle of a short tower cable stay as described in claim 8, characterized in that: Includes the following steps; S1: First, adjust the dimensions of the jig (1) on the construction platform as needed; S2: Then use hoisting equipment to lift and precisely position the cable saddle (11) onto the frame (1); S3: Then, the entire frame (1) is hoisted onto the tower column (31) using hoisting equipment, and the lower end of the frame (1) is connected to the embedded part (32) on the tower column (31). S4: Repeat the above operation and dock the next said tire frame (1) with the previous said tire frame (1).

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