A short derrick longitudinal bridge offset adjustment device

Abstract

This invention relates to a short hanger longitudinal offset adjustment device for bridges. Elliptical holes are correspondingly provided on the arch rib and bridge deck. Several pairs of ear plates are correspondingly provided above the arch rib and below the bridge deck. The upper and lower ends of the short hanger pass through the elliptical holes on the arch rib and bridge deck, respectively. The upper and lower ends of the short hanger are anchored to the drum-shaped cross-section area between the ear plates by prestressed anchors. The beneficial effects of this invention are: by providing upper and lower ear plates on the arch rib and bridge deck respectively, and anchoring the upper and lower ends of the short hanger to the ends of the upper and lower ear plates respectively, the length of the short hanger is longer than that in traditional bridge structures, effectively improving its ability to resist bending stress; and by installing torsional dampers on both sides of the anchoring end of the short hanger, when the short hanger experiences high-frequency vibration, the torsional dampers provide buffering force, reducing the vibration effect of the short hanger.

Description

Technical Field

[0001] This invention belongs to the field of bridge engineering technology, and in particular relates to a short hanger longitudinal bridge offset adjustment device. Background Technology

[0002] Tied arch bridges are highly favored in the construction of long-span bridges due to their advantages such as high rigidity, strong span capacity, and significant economic benefits. As an important component of tied arch bridges, the suspenders connect the arch ribs and the bridge deck structure, transferring loads between them. They are core components affecting the stress distribution of the bridge, and their safety and durability are crucial to the normal use of the bridge structure.

[0003] Hangers are typically composed of steel strand cables and protective sheaths, anchored at both ends above the arch ribs and below the bridge deck. In actual engineering, the hangers at both ends of arch bridges are the shortest, exhibiting greater stiffness and higher natural frequency compared to longer hangers, making them more prone to failure. During bridge operation, when the overall temperature changes, the mid-span serves as a deformation reference point, causing the beam to extend laterally. This results in significant relative displacement at the upper and lower anchor points of the hangers, leading to substantial shear deformation and bending stress in the short hangers, which are repeatedly subjected to bending and shearing. Furthermore, the short hangers experience a more pronounced dynamic amplification effect when subjected to impact loads from vehicles, exacerbating fatigue damage. Combined with corrosion in the anchorage area of ​​the short hangers, accidents involving sudden breakage of short hangers and partial collapse of arch bridges have become increasingly common in recent years. The limiting devices for short hangers in the existing technology have the following problems: First, the short hangers cannot effectively unload a large part of the bending moment and shear force, resulting in the short hangers still bearing a large stress; Second, the short hangers are prone to fatigue damage during use, posing a safety hazard to the bridge; Third, the short hangers need to be inspected and replaced regularly, increasing the inspection, maintenance and operation costs of the arch bridge.

[0004] Based on the current engineering application status, it is necessary to design a longitudinal misalignment device suitable for short hangers of arch bridges to enhance their ability to cope with combined deformation, thereby extending the service life of short hangers and ensuring the safety and durability of bridge structures. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a short suspension rod longitudinal bridge offset adjustment device.

[0006] This short-suspender longitudinal bridge offset adjustment device has elliptical holes correspondingly opened on the arch rib and bridge deck, with the long side of the elliptical holes parallel to the length direction of the bridge; several pairs of ear plates are correspondingly provided above the arch rib and below the bridge deck, with two opposite ear plates respectively located on both sides of the elliptical holes perpendicular to the length direction of the bridge.

[0007] A drum-shaped section is provided between the ear plates on both sides of the elliptical hole through a roller. The upper and lower ends of the short hanger pass through the elliptical hole on the arch rib and the bridge deck, respectively. The upper and lower ends of the short hanger are anchored to the drum-shaped section between the ear plates by prestressed anchors.

[0008] Holes are pre-drilled at the ends of the ear plates on both sides of the elliptical hole. A threaded rod passes through the roller, and both ends of the threaded rod extend out of the hole and are respectively equipped with torsional dampers. In the initial state, the drum-shaped cross-section area connected to both ends of the short rod is horizontal.

[0009] Preferably, the ear plate includes an upper ear plate and a lower ear plate, with the upper ear plate located above the arch rib and the lower ear plate located below the bridge deck. The elliptical holes on the arch rib and the bridge deck are located on the same vertical line in pairs, and the upper ear plate and the lower ear plate are also located on the same vertical line in pairs.

[0010] Preferably, the roller is coaxial with the hole at the end of the ear plate, and both ends of the threaded rod extend to the outside of the two ear plates through the hole at the end of the ear plate. Torsional dampers are connected to both ends of the threaded rod on the outside of the ear plates respectively.

[0011] Preferably, the length of the threaded rod is greater than the sum of the length of the roller and the thickness of the two ear plates.

[0012] Preferably, the torsional damper contains a non-Newtonian fluid.

[0013] The method of using this short hanger longitudinal bridge offset adjustment device, and the installation of the short hanger longitudinal bridge offset adjustment device, includes the following steps:

[0014] Step 1: Reserve elliptical holes on the arch ribs and bridge deck at the locations corresponding to the installation positions of the short hangers;

[0015] Step 2: Install ear plates in pairs on both sides of the elliptical hole;

[0016] Step 3: The upper and lower ends of the short hanger rod pass through the elliptical holes on the arch rib and the bridge deck, respectively, and are anchored to the drum-shaped section area.

[0017] Step 4: Extend the drum-shaped section sections connected at both ends of the short rod to the holes at the ends of the ear plates. The upper and lower surfaces of the drum-shaped section sections are horizontal. Install the threaded rod into the roller through the hole on one side of the ear plate and extend it out through the hole on the other side of the ear plate. Install torsional dampers at both ends of the threaded rod.

[0018] Preferably, after the short hanger longitudinal bridge offset adjustment device is installed, when the arch rib and bridge deck of the arch bridge are misaligned, the short hanger deflects, and the drum-shaped cross-section area and roller connected at the upper and lower ends of the short hanger rotate between the ear plates.

[0019] Preferably, when the arch bridge vibrates and the short hanger deflects, the drum-shaped section area and the roller rotate back and forth between the ear plate, and the torsional damper generates a buffering force.

[0020] The beneficial effects of this invention are:

[0021] 1) By setting upper and lower ear plates on the arch rib and bridge deck respectively, and anchoring the upper and lower ends of the short hanger to the ends of the upper and lower ear plates respectively, the length of the short hanger is longer than that in traditional bridge structures, which effectively improves its ability to resist bending stress.

[0022] 2) By pre-reserving elliptical holes in the arch ribs and bridge deck, the present invention provides space for the deflection of the short hangers and anchors both ends of the short hangers to the rotatable drum-shaped cross-section area. This can improve the ability of the short hangers to cope with combined deformation, ensure that the short hangers can deflect within a certain range, avoid the occurrence of shear and bending stress, thereby extending the service life of the short hangers, reducing the number of maintenance and replacement times of the short hangers, and reducing the economic cost of bridge maintenance.

[0023] 3) In view of the characteristics of short spur rods having high stiffness, high natural frequency, weak buffering capacity for dynamic loads, and sensitivity to dynamic effects, this invention adds torsional dampers to both sides of the anchoring end of the short spur rod. When the short spur rod vibrates at high frequency, the torsional dampers provide buffering force to reduce the vibration effect of the short spur rod. Attached Figure Description

[0024] Figure 1 This is a front view of the entire device;

[0025] Figure 2 This is a rear view of the entire device;

[0026] Figure 3 This is a right-side view of the entire device.

[0027] Figure 4 This is a left-side view of the entire device;

[0028] Figure 5 This is a top view of the entire device;

[0029] Figure 6 A schematic diagram of the device from one perspective;

[0030] Figure 7 This is a magnified schematic diagram of the top anchoring of the device.

[0031] Explanation of reference numerals in the attached drawings: 1. Arch rib; 2. Bridge deck; 3. Short hanger; 4. Upper ear plate; 5. Lower ear plate; 6. Torsional damper; 7. Roller; 8. Prestressed anchor; 9. Drum-shaped section. Detailed Implementation

[0032] The present invention will be further described below with reference to embodiments. The description of the embodiments below is only for the purpose of helping to understand the present invention. It should be noted that those skilled in the art can make several modifications to the present invention without departing from the principle of the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

[0033] Example 1

[0034] As one example, the bridge's arch is a box-section arch rib designed during the bridge design phase, and the bridge's beams are box-section beams designed during the bridge design phase, such as... Figures 1 to 7 As shown, this short hanger longitudinal bridge offset adjustment device has elliptical holes correspondingly opened on the arch rib 1 and the bridge deck 2 to provide a channel for the short hanger 3. The long side of the elliptical hole is parallel to the length direction of the bridge, providing space for the short hanger 3 to deflect in the length direction of the bridge.

[0035] like Figure 1 and Figure 2 As shown, several pairs of ear plates are provided above the arch rib 1 and below the bridge deck 2. The two opposite ear plates are respectively located on both sides of the elliptical hole perpendicular to the length direction of the bridge. The ear plates include an upper ear plate 4 and a lower ear plate 5. The upper ear plate 4 is located above the arch rib 1 and the lower ear plate 5 is located below the bridge deck 2. The elliptical holes on the arch rib 1 and the bridge deck 2 are located on the same vertical line in pairs, and the upper ear plate 4 and the lower ear plate 5 are also located on the same vertical line.

[0036] like Figure 7 As shown, a drum-shaped section 9 is provided between the ear plates on both sides of the elliptical hole via a roller 7. The spacing between the ear plates is consistent with the overall length of the roller 7. The upper and lower ends of the short hanger 3 pass through the elliptical holes on the arch rib 1 and the bridge deck 2, respectively. The short hanger 3 includes a prestressed steel strand cable and its protective sleeve. The outer layer of the cable protective sleeve has an anti-corrosion coating.

[0037] like Figures 3 to 6 As shown, the upper and lower ends of the short hanger 3 are respectively anchored to the drum-shaped section area 9 between the ear plates by prestressed anchors 8; the two ends of the short hanger 3 are respectively located between the ends of the upper ear plate 4 and the lower ear plate 5. Therefore, the length of the short hanger 3 is significantly greater than the vertical distance between the arch rib 1 and the bridge deck 2, which is longer than that in traditional bridge structures, thus avoiding the problem of excessive bending stress caused by the side hangers being too short in the original bridge structure.

[0038] Holes are pre-drilled at the ends of the ear plates on both sides of the elliptical hole. A threaded rod passes through the roller 7. The roller 7 is coaxial with the hole at the end of the ear plate. The two ends of the threaded rod extend to the outside of the two ear plates through the holes at the end of the ear plates for symmetrical installation of the torsional damper 6.

[0039] The length of the threaded rod is greater than the sum of the length of the roller 7 and the thickness of the two ear plates. Torsional dampers 6 are connected to both ends of the threaded rod on the outside of the ear plates. The torsional damper 6 contains a non-Newtonian fluid. When rapid motion occurs, shear thickening will occur. The torsional damper 6 reduces the motion function of the device through the viscous resistance of the liquid medium. That is, when the roller 7 rotates, the torsional damper 6 reduces the torsion, thereby limiting the deviation of the short rod 3.

[0040] In the initial state, the drum-shaped section 9 connected to both ends of the short rod 3 is horizontal.

[0041] Example 2

[0042] As another embodiment, this embodiment two, based on embodiment one, proposes a more specific short suspension rod longitudinal bridge offset adjustment device, wherein a temperature component is also provided on the surface of the short suspension rod 3, specifically:

[0043] Under the same temperature difference, the longitudinal displacement of the bridge deck 2 caused by the overall temperature difference is inconsistent with the longitudinal displacement of the arch rib 1. The displacement of the bridge deck 2 is relatively prominent, causing the upper and lower ends of each short hanger 3 to undergo relative longitudinal displacement, resulting in bending deformation and shear deformation at both ends of the short hanger 3. This invention provides a temperature control disc at the elliptical holes of the arch rib 1 and the bridge deck 2, and achieves temperature balance at the upper and lower ends by adding a temperature component. The temperature control disc heats and cools the liquid inside the temperature component through a temperature control chip, thereby balancing and adjusting the overall temperature of the short hanger 3, ensuring that the longitudinal displacement of the bridge deck 2 and the longitudinal displacement of the arch rib 1 are consistent within a reasonable range.

[0044] It should be noted that the parts in this embodiment that are the same as or similar to those in Embodiment 1 can be referred to each other, and will not be repeated in this application.

[0045] Example 3

[0046] As another embodiment, the method of using the short hanger longitudinal bridge offset adjustment device proposed in Embodiments 1 and 2 includes the following installation steps:

[0047] Step 1: Install the arch rib 1 and bridge deck 2 according to the design drawings provided during the bridge design phase. Reserve elliptical holes on the arch rib 1 and bridge deck 2 at the locations corresponding to the installation positions of the short hangers 3; the diameter of the elliptical holes corresponds to the diameter of the short hangers 3, and the length of the elliptical holes is greater than the diameter of the short hangers 3, allowing the short hangers 3 to tilt and deflect. Install the temperature control disc, corresponding to the size of the elliptical holes, on the arch rib 1 and bridge deck 2.

[0048] Step 2: Install ear plates in pairs on both sides of the elliptical hole; make holes at the ends of the upper ear plate 4 and the lower ear plate 5 respectively for installing the drum-shaped section area 9, the threaded rod of the roller 7 and the torsional damper 6.

[0049] Step 3: The upper and lower ends of the short hanger 3 pass through the elliptical holes on the arch rib 1 and the bridge deck 2 respectively, and are anchored to the drum-shaped section area 9 respectively through the prestressed anchor 8;

[0050] Step 4: Extend the drum-shaped section 9 connected to both ends of the short hanger 3 to the holes at the ends of the ear plates, keeping them at the same height as the holes in the welded ear plates, and ensuring that the upper and lower surfaces of the drum-shaped section 9 are horizontal. Install the threaded rod into the roller through the hole on one side of the ear plate and extend it out through the hole on the other side of the ear plate. Install torsional dampers 6 at both ends of the threaded rod. First, fix the lower end of the short hanger 3, then tension the short hanger 3 and fix the upper end.

[0051] Example 4

[0052] As another embodiment, this embodiment four proposes a method for dealing with the deflection and vibration of the short hanger 3 based on the short hanger longitudinal bridge offset adjustment device in embodiment three.

[0053] After the installation of the short hanger longitudinal bridge offset adjustment device, when the arch rib 1 and bridge deck 2 of the arch bridge misalign, the short hanger 3 deflects, and the drum-shaped section 9 and roller 7 connected at the upper and lower ends of the short hanger 3 rotate between the ear plates. When the misalignment process of the arch rib 1 and bridge deck 2 is slow, and the temperature causes the arch rib 1 and bridge deck 2 to deflect slowly with different expansion and contraction amplitudes, the rotation speed of the roller 7 is small, and the torsional damper 6 will not generate significant buffering force.

[0054] When the vehicle is in operation, the short boom 3 is prone to high-frequency vibration. When the short boom 3 vibrates, the drum-shaped section 9 and the roller 7 rotate back and forth between the ear plate, generating high-frequency shear force on the non-Newtonian fluid, causing the torsional damper 6 to respond quickly. Due to its shear thickening property, the non-Newtonian fluid in the torsional damper 6 automatically thickens and plays a buffering role. The torsional damper 6 generates a buffering force, reducing the vibration effect of the short boom 3 when the vehicle is in operation.

[0055] It should be noted that the parts in this embodiment that are the same as or similar to those in Embodiment 3 can be referred to each other, and will not be repeated in this application.

[0056] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

Claims

1. A short suspension rod longitudinal bridge offset adjustment device, characterized in that: Elliptical holes are provided on the arch rib (1) and the bridge deck (2) respectively, with the long side of the elliptical holes parallel to the length of the bridge; several pairs of ear plates are provided on the top of the arch rib (1) and the bottom of the bridge deck (2), with the two opposite ear plates respectively located on both sides of the elliptical holes perpendicular to the length of the bridge. The ear plates on both sides of the elliptical hole are provided with a drum-shaped section area (9) through the roller (7) for rotation. The upper and lower ends of the short hanger (3) pass through the elliptical hole on the arch rib (1) and the bridge deck (2) respectively. The upper and lower ends of the short hanger (3) are anchored to the drum-shaped section area (9) between the ear plates through the prestressed anchor (8). Holes are reserved at the ends of the ear plates on both sides of the elliptical hole. A threaded rod passes through the roller (7). The two ends of the threaded rod extend out of the hole and are respectively provided with torsional dampers (6). In the initial state, the drum-shaped section area (9) connected to both ends of the short rod (3) is horizontal.

2. The short suspension rod longitudinal bridge offset adjustment device according to claim 1, characterized in that, The ear plate includes an upper ear plate (4) and a lower ear plate (5). The upper ear plate (4) is located above the arch rib (1), and the lower ear plate (5) is located below the bridge deck (2). The elliptical holes on the arch rib (1) and the bridge deck (2) are located on the same vertical line in pairs, and the upper ear plate (4) and the lower ear plate (5) are also located on the same vertical line in pairs.

3. The short suspension rod longitudinal bridge offset adjustment device according to claim 1, characterized in that, The roller (7) is coaxial with the hole at the end of the ear plate. The two ends of the threaded rod extend to the outside of the two ear plates through the hole at the end of the ear plate. The two ends of the threaded rod are respectively connected to torsional dampers (6) on the outside of the ear plates.

4. The short suspension rod longitudinal bridge offset adjustment device according to claim 3, characterized in that, The length of the threaded rod is greater than the sum of the length of the roller (7) and the thickness of the two ear plates.

5. The short suspension rod longitudinal bridge offset adjustment device according to claim 1, characterized in that, The torsional damper (6) contains a non-Newtonian fluid.

6. The method of using the short suspension rod longitudinal bridge offset adjustment device as described in any one of claims 1 to 5, characterized in that, The installation of the short hanger longitudinal bridge offset adjustment device includes the following steps: Step 1: Reserve elliptical holes on the arch rib (1) and bridge deck (2) at the locations corresponding to the short hangers (3); Step 2: Install ear plates in pairs on both sides of the elliptical hole; Step 3: The upper and lower ends of the short hanger (3) pass through the elliptical holes on the arch rib (1) and the bridge deck (2) respectively, and are anchored to the drum-shaped section area (9) respectively; Step 4: Extend the drum-shaped section (9) connected to both ends of the short rod (3) to the holes at the ends of the ear plates. The upper and lower surfaces of the drum-shaped section (9) are horizontal. Install the threaded rod into the roller through the hole on one side of the ear plate and extend it out through the hole on the other side of the ear plate. Install torsional dampers (6) at both ends of the threaded rod.

7. The method of using the short suspension rod longitudinal bridge offset adjustment device according to claim 6, characterized in that, After the short hanger longitudinal bridge offset adjustment device is installed, when the arch rib (1) and bridge deck (2) of the arch bridge are misaligned, the short hanger (3) deflects, and the drum-shaped section area (9) and roller (7) connected at the upper and lower ends of the short hanger (3) rotate between the ear plate.

8. The method of using the short suspension rod longitudinal bridge offset adjustment device according to claim 7, characterized in that, When the arch bridge vibrates, the short hanger (3) deflects, the drum-shaped section (9) and the roller (7) rotate back and forth between the ear plates, and the torsional damper (6) generates a buffering force.

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