Novel bridge expansion joint device joint structure based on HSFRC
By using HSFRC to fill the anchoring area and the new type connecting structure of the welding steps in the bridge telescopic joint device, the problem of prone to damage and welding process of concrete in the anchor zone is solved. And structural stiffness.
Patent Information
- Application Number
- CN202411622054.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-14
- Publication Date
- 2025-01-28
AI Technical Summary
In the existing bridge expansion joint devices, the concrete in the anchorage area is prone to damage and the welding process is complicated, resulting in a short life of the device and needs to be replaced frequently, which poses safety hazards.
Adopt a new type of bridge telescopic seam device connector structure based on HSFRC, including the unilateral short welding nail joint structure and the fixed joint of bilateral welding nails, cancel the welding between anchoring steel plates and embedded steel bars, use HSFRC to fill the anchoring area, simplify the construction steps Essence
Effectively improve the intensity and life of concrete in the anchoring zone, simplify the construction process, reduce energy consumption, improve the overall structural stiffness and force performance of the device, and reduce hidden safety hazards.
Smart Images
Figure CN119373004A_ABST
Abstract
Description
Technical Field
[0001] The device relates to the field of expansion joint device structure, and is specifically manifested in two new anchoring zone joint structures. Background Art
[0002] As an important part of highways, bridge expansion joints are used to meet the needs of bridge deck deformation. In recent years, my country has made outstanding achievements in the field of bridge expansion joints, and its design and manufacturing technology has reached the international advanced level.
[0003] However, the existing expansion joints still have the problem of easy damage to the concrete in the anchoring area. Traditional anchoring area concrete mostly uses low-strength ordinary concrete or steel fiber concrete materials. These traditional concrete materials cannot be ideally combined with the anchoring system, and the concrete is easily exposed under the action of vehicle-borne cycles, which accelerates the damage of the expansion joint system, shortens the life of the expansion joint device, and requires frequent replacement of the expansion joint, which reduces the smoothness of traffic.
[0004] In addition, there are also problems such as the complicated on-site welding process of the embedded parts of the expansion joint device and the easy damage of the welded parts. The welding form is the main reason for the short fatigue life of the expansion joint device. The traditional expansion joint device needs to be welded with the embedded steel bars, and the welding steps are complicated. For the single-seam expansion joint device, under the frequent impact and torsion of the vehicle, the welding position between the side longitudinal beam and the connecting part is more likely to be damaged, resulting in the fall of concrete, the connection between the side longitudinal beam and the anchor plate or anchor bar is reduced, and the integrity of the expansion joint device is deteriorated, which poses a safety hazard to traffic.
[0005] In view of this, it is particularly important to develop a new type of bridge expansion joint structure device with strong anchoring performance and high hardness. Summary of the invention
[0006] In order to solve the deficiencies of the prior art, the present invention aims at the deficiencies of the traditional bridge expansion joint joint structure and provides a new bridge expansion joint device joint structure based on HSFRC, including two new anchor joint structures. Both new joint structures eliminate a large amount of on-site welding between the anchor steel plate and the embedded steel bar, and achieve zero welding to complete the docking installation, which not only effectively avoids the quality and technical problems caused by on-site welding, but also saves the energy loss caused by the welding process, which is both technical and economical.
[0007] To achieve the above-mentioned purpose of the invention, the technical solution of the present invention is as follows: A new type of bridge expansion joint device joint structure based on HSFRC, including a single-side short welding nail joint structure and a double-side welding nail fixed joint structure: Both joint structures will use HSFRC concrete to fill the anchorage area. This high-strength steel fiber reinforced concrete enhances the strength of the joint structure, solves the problem of concrete peeling and cracking, and greatly increases the life of the joint structure.
[0008] Both joint structures eliminate the welding between the anchor steel plate and the embedded steel bars and the cross steel bars in the concrete of the anchor area. The embedded steel bars and the anchor steel plates are staggered, which reduces the complicated process of welding. The construction steps are greatly simplified, and only the embedded steel bars and the cross steel bars arranged in the main beam need to be tied, which shortens the construction time.
[0009] The single-sided short welded nail joint structure is fixed with shear-resistant short welded nails on one side of the embedded steel bar, ensuring the coordinated force of the expansion device and the HSFRC.
[0010] Preferably, the single-sided short weld nail joint structure is constructed by installing anchor bars on one side of the anchor plate, and the welding between the reserved steel bars and the anchor steel bars on the other side is cancelled, and then fixed with shear-resistant short weld nails to avoid the relative position deviation between the anchor steel plate and the embedded steel bars, resulting in position overlap or gaps.
[0011] Preferably, the double-sided rivet fixed joint structure has short rivets installed on both sides of the anchor plate, the anchor steel bars originally welded on one side are cancelled, and long rivets with a spacing of 100 mm are added laterally to fix the F-shaped steel and the anchor steel plate.
[0012] Preferably, the anchorage length of the embedded steel bars in the concrete of the anchorage zone is increased from the original 90 mm to 140 mm.
[0013] Preferably, the short welding nails have a size of 35 mm×13 mm and a spacing of 50 mm.
[0014] Preferably, the size of the long welding nail is 100 mm×16 mm, and the net protective layer thickness of the nail cap is 15 mm.
[0015] Compared with the prior art, the present invention has the following advantages: Compared with the traditional expansion joint device, this device replaces the SFRC in the traditional expansion joint reserved groove with HSFRC, which can effectively solve the problems of low concrete strength and easy peeling and cracking in the anchoring area of the expansion joint structure. The initial crack load of HSFRC is 1-2 times that of the initial crack load of the traditional welded specimen, and the ultimate bearing capacity is about 1 times and 2 times that of the traditional welded specimen.
[0016] Compared with traditional welding methods, this device eliminates a large amount of on-site welding between the embedded steel bars and the telescopic device during on-site construction, simplifies the construction, and achieves zero welding between the anchor plate and the embedded steel bars to complete the docking installation, effectively avoiding the quality problems caused by on-site welding, and making the new anchoring structure have good technical properties.
[0017] Compared with the bonding and anchoring capacity of the traditional device, the bonding and anchoring capacity of the HSFRC of the present device for the telescopic device has a large surplus relative to the ultimate bearing capacity of the weld fracture.
[0018] Compared with the overall structural rigidity of the traditional device, the addition of medium-sized steel lateral long welding nails in the double-sided welding nail fixing structure of the HSFRC telescopic device effectively limits the development of interface cracks, while improving the stress conditions at the weld position, greatly improving the overall structural rigidity of the device.
[0019] Compared with the stress-bearing performance and anchoring performance of traditional devices, the stress-bearing performance and anchoring performance of the two new expansion joint joint structures are greatly improved. At the same time, they also have the advantages of convenient construction and high installation tolerance. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 It is a schematic diagram of the overall structure of a single-side short welded nail joint structure of a new expansion joint device; Figure 2 It is a schematic diagram of the internal structure of a single-side short welded nail joint structure of a new expansion joint device; Figure 3 It is a schematic diagram of the internal structure of the joint structure of a traditional expansion joint device; Figure 4 It is a schematic diagram of the overall structure of the double-sided welded nail fixed joint structure of the new expansion joint device; Figure 5 A schematic diagram of the internal structure of the double-sided welded nail fixed joint structure of the new expansion joint device; In the figure: 1-short weld nails for shear connection, 2-anchor steel bars, 3-anchor steel plates, 4-concrete HSFRC in the anchoring area, 5-F-shaped steel, 6-crossing steel bars in the concrete in the anchoring area, 7-crossing steel bars arranged in the main beam, 8-embedded steel bars, 9-long weld nails for shear connection Specific implementation methods
[0021] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.
[0022] Example 1 Referring to the accompanying drawings: This example is a single-side short welded nail joint structure of a telescopic device anchoring area, which includes anchoring area concrete HSFRC4, anchoring steel plate 3, anchoring steel bar 2, cross-bar 7 arranged in the main beam, embedded steel bar 8, F-shaped steel 5 and shear-resistant short welded nail 1. Its anchoring steel plate 3 is consistent with the traditional telescopic device, and the anchoring steel bar 2 is installed on one side of the anchoring steel plate 3. The welding step between the embedded steel bar 8 on the other side and the anchoring steel plate 3 is cancelled and staggered. The anchoring steel plate 3 is located between two adjacent embedded steel bars, 100mm away from the embedded steel bar 8, and then the shear-resistant short welded nail 1 is installed on the anchoring steel plate 3. Not only the cross-bar 6 in the anchoring area HSFRC concrete is cancelled, but also the anchoring length of the embedded steel bar 8 in the anchoring area concrete HSFRC4 is increased from the original 90mm to 140mm.
[0023] This embodiment eliminates the step of welding the anchor steel plate and the embedded steel bars, simplifies the on-site construction operation, makes the installation quality of the expansion joint device visible, and uses shear-resistant short welding nails to connect, ensuring that the expansion joint device and the HSFRC are subjected to coordinated force. HSFRC has a large surplus of the ultimate bearing capacity of the weld fracture due to its ultra-high bonding and anchoring performance. Compared with the traditional expansion joint device joint structure that requires tying the embedded steel bars-the cross-bars in the main beam, and the anchor bars-the cross-bars of the concrete in the anchoring area, the joint structure of this device only requires tying the embedded steel bars-the cross-bars arranged in the main beam, which greatly shortens the construction time.
[0024] Example 2 refers to the accompanying drawings: This example is a double-sided weld fixing structure in the anchoring area of a telescopic device, which includes an anchoring area concrete HSFRC4, an anchoring steel plate 3, a transverse steel bar 7 arranged in the main beam, an embedded steel bar 8, an F-shaped steel 5, a shear-resistant long weld 9 and a shear-resistant short weld 1. The anchoring steel plate 3 also remains unchanged, and the side of the anchoring steel plate 3 with the embedded steel bar 8 still adopts a staggered arrangement method, but the anchoring steel bar 2 welded on the other side of the anchoring steel plate 3 is cancelled, and short shear-resistant welds 1 are added on both sides of the anchoring steel plate 3, and long shear-resistant welds 8 with a spacing of 100 mm are added to the sides of the F-shaped steel 5.
[0025] The anti-pullout effect of the long lateral weld nails of the steel section in this embodiment strengthens the connection between the telescopic device and the HSFRC, effectively suppresses the development of interface separation displacement under load, improves the connection performance between the F-shaped steel and the interface, and significantly reduces the strain of the anchor plate. The stress at the weld position is improved, making it have a higher bearing capacity and ensuring the reliability of the interface connection.
Claims
1. A new type of bridge expansion joint device joint structure based on HSFRC, characterized by: Including single-side short welding nail joint structure and double-side welding nail fixed joint structure; The single-sided short welded nail joint structure includes HSFRC, anchor steel plate, anchor steel bar, cross steel bar arranged in the main beam, embedded steel bar, F-shaped steel and shear-resistant short welded nail; the embedded steel bar on one side of the anchor steel plate is staggered with the anchor steel plate, and then fixed with the shear-resistant short welded nail; the anchor steel bar on the other side of the anchor steel plate is welded to the anchor steel plate; the concrete in the anchoring area is filled with the HSFRC.
2. The double-sided rivet fixed joint structure includes HSFRC, anchor steel plates, transverse steel bars arranged in the main beam, embedded steel bars, F-shaped steel, long shear connection rivets and short shear connection rivets; the embedded steel bars on one side of the anchor steel plate are staggered with the anchor steel plate; the short shear connection rivets are added to both sides of the anchor steel plate for fixing; the long shear connection rivets are added to the sides of the F-shaped steel.
3. The single-sided short welding nail joint structure according to claim 1 is characterized in that: The single-sided short welded nail joint structure is designed for conventional bridge expansion joint structures.
4. The HSFRC according to claim 1, characterized in that: HSFRC is a new type of fiber-reinforced cement-based composite material formulated based on the principle of maximum density. It has the characteristics of no coarse aggregate and a large amount of steel fibers infiltrated inside.
5. The single-side short welding nail joint structure according to claim 1 is characterized in that: The anchor steel plate is arranged in the middle of two adjacent embedded steel bars.
6. The double-sided welding nail fixing joint structure according to claim 1 is characterized in that: The double-sided welded nail fixed joint structure is designed for bridge expansion joint structures with a large number of heavy-loaded vehicles passing through.
7. The F-shaped steel according to claim 1, characterized in that: The cross-sectional shape of F-shaped steel is similar to the letter "F", which is usually composed of upper and lower flanges and a middle web. The welding form and anchoring steel bars are different from the embedded steel bars.
8. The welding method according to claim 6, characterized in that The welding method between the F-shaped steel and the anchor steel plate is gas shielded arc welding.