Hinge joint reinforcing device of hollow slab girder bridge

Abstract

The utility model discloses a hinge joint reinforcing device of a hollow slab girder bridge, which is characterized in that the hinge joint reinforcing device comprises a plurality of upper fixing plates, a plurality of lower fixing plates, a plurality of carbon fiber prestress inhaul cable devices and channel steel, and the number of the upper fixing plates, the number of the lower fixing plates and the number of the carbon fiber prestress inhaul cable devices are the same. Each upper fixing plate fixedly covers the upper portion of the corresponding hinge joint, the channel steel transversely crosses the multiple hinge joints to be fixedly arranged on the bottom face of the hollow slab girder bridge and located below the upper fixing plates, and the upper ends of the carbon fiber prestress inhaul cable devices are fixedly connected with the upper fixing plates. The lower end of the carbon fiber prestress inhaul cable device downwards penetrates through the channel steel to be fixedly connected with a lower fixing plate, and the lower fixing plate is tightly attached to the bottom of the channel steel. The connecting structure has the advantages that the transverse connection between the adjacent hollow plate beams is improved, so that the load can be better transmitted between the hollow plate beams under the action of prestress, a better whole is formed, and the extreme condition that a single plate is stressed is prevented.

Description

TECHNICAL FIELD

[0001] The utility model relates to a reinforcing device of building structure especially hinge joint reinforcing device of hollow slab beam bridge. BACKGROUND

[0002] Hollow slab beam bridge becomes one of the first bridge types of small and medium span bridges with the advantages of simple structure, convenient construction, strong adaptability, low building height, etc., and the number of the currently in-service simply supported hollow slab beam bridges is huge, and the main diseases existing universally include concrete falling off of hinge joint, longitudinal crack of main beam bottom, main beam misplacement, bridge deck pavement damage, and some more serious single plate stress conditions.

[0003] In recent years, domestic scholars attempt to use transverse prestress to reinforce hollow slab beam bridge, and the result shows that the application of transverse prestress is beneficial to enhancing the transverse connection between slab and beam, actively improving the hinge joint stress and load transverse distribution of hollow slab beam bridge, improving the transverse overall rigidity, reducing the emergence of single plate stress condition, realizing the fundamental prevention and treatment of hinge joint diseases, and the reinforcing effect is remarkable, but the current relevant researches on the transverse prestress reinforcing technology all only stay in qualitative analysis, and no reinforcing principle is given, and no system is formed; and because the material for applying transverse prestress adopts prestressed steel strand, transverse holes need to be made on the hollow slab during construction, the process is complex and difficult, and the steel strand needs to be subjected to corrosion protection treatment, thereby limiting the wide application of the reinforcing technology.

[0004] The current method for reinforcing hinge joint is usually complex, expensive, and limited in bearing capacity and durability. SUMMARY

[0005] The utility model solves the technical problem that provide a kind of hinge joint reinforcing device of hollow slab beam bridge, which is simple in structure, easy to install, can effectively enhance the overall integrity of bridge structure, bearing capacity and service life.

[0006] The utility model discloses a hinge joint reinforcing device of hollow slab beam bridge, wherein the hollow slab beam bridge is composed of a plurality of hollow slab beams arranged side by side, a hinge joint is formed between two adjacent hollow slab beams, and the hinge joint reinforcing device comprises a plurality of upper fixing plates, a plurality of lower fixing plates, a plurality of carbon fiber prestressed cable devices and channel steels. The number of the upper fixing plates, the lower fixing plates and the carbon fiber prestressed cable devices is the same, each upper fixing plate is fixedly arranged on the upper part of a hinge joint, the channel steels are fixedly arranged on the bottom surface of the hollow slab beam bridge and located below the upper fixing plates in a transverse manner, the upper end of each carbon fiber prestressed cable device is fixedly connected with the upper fixing plate, the lower end of each carbon fiber prestressed cable device penetrates through the channel steel and is fixedly connected with the lower fixing plate, and the lower fixing plate is tightly arranged on the bottom of the channel steel.

[0007] Compared with the prior art, the hollow slab beam bridge has the advantages that the groove steel is arranged at the bottom of the hollow slab beam in the transverse direction, the carbon fiber prestressed cable device with vertical prestress is arranged in the hinge joint, the transverse connection between the adjacent hollow slab beams is improved, the load can be better transmitted between the hollow slab beams under the prestress, a better whole is formed, the extreme situation of single plate stress is prevented, the damage of the hinge joint is smaller when the hollow slab beam bridge is affected by the vehicle load and other factors during long-term operation, the effective service life is longer, and the maintenance frequency is lower; the moment of inertia of the groove steel is large and the weight is light, the groove steel has a good reinforcing effect as the main structure of the transverse connection; the lower end of the carbon fiber prestressed cable device is fixedly connected to the lower fixing plate through the groove steel, the lower fixing plate is close to the groove steel, local stress concentration caused by tension and load is reduced, shear force caused by the load applied between the beams to the hinge joint is reduced, the lower end of the carbon fiber prestressed cable device is usually thickened locally at the groove steel part to slow down the axial force caused by tension and load, and the service life of the device is longer.

[0008] The upper fixing plate is fixed to the top surface of the hollow slab beam on both sides of the hinge joint through at least two upper fixing bars provided with upper embedded anchor nuts, and the groove steel is fixed to the bottom surface of the hollow slab beam through a plurality of lower fixing bars provided with lower embedded anchor nuts. The upper fixing plate usually has a large thickness, which is beneficial to prevent deformation under the condition that the prestress of the carbon fiber prestressed cable device is large, and can prevent stress concentration, so that the service life of the device is longer.

[0009] The carbon fiber prestressed cable device includes an upper connecting screw, an upper connecting anchor, a carbon fiber cable, a lower connecting anchor, and a lower connecting screw, which are fixedly connected from top to bottom. The upper connecting screw passes upward through the upper fixing plate and is fixed to the upper fixing plate by an upper connecting nut. An upper expansion gap is formed between the upper connecting anchor and the upper opening of the hinge. The lower connecting screw passes downward through the channel steel and the lower fixing plate and is fixed to the lower fixing plate by a lower connecting nut. A lower expansion gap is formed between the lower connecting anchor and the lower opening of the hinge. By tensioning the carbon fiber cables with upper and lower connecting anchors, prestress is applied between the beams, which not only enables more effective connection between the beams but also improves the overall load-bearing capacity of the bridge. The channel steel fully connects the carbon fiber prestressed cable devices between the hinge joints. When the bridge deck is loaded, it can achieve a unified force distribution, offsetting excessive local loads through prestressing and transferring them to other beams through the channel steel. This mitigates the adverse effects of excessive local loads and solves the problem of bridge damage caused by excessive local stress due to damage to the bridge hinge joints. The upper and lower expansion gaps are used to maintain a certain distance between the upper and lower connecting anchors and the upper and lower parts of the hollow slab beam located in the hinge joint, respectively, for subsequent tensioning. Attached Figure Description

[0010] Fig. 1 This is a schematic diagram of the installation structure of this utility model;

[0011] Fig. 2 This is a top view of the structure of this utility model;

[0012] Fig. 3 This is a bottom view of the structure of this utility model.

[0013] Explanation of reference numerals in the attached figures:

[0014] 1. Hollow core slab beam; 2. Hinge joint; 3. Upper fixing plate; 31. Upper fixing reinforcement; 32. Upper reinforcement nut; 4. Lower fixing plate; 5. Channel steel; 51. Lower fixing reinforcement; 52. Lower reinforcement nut;

[0015] 61. Upper connecting screw; 62. Upper connecting anchor; 63. Carbon fiber cable; 64. Lower connecting anchor; 65. Lower connecting screw; 66. Upper connecting nut; 67. Upper expansion gap; 68. Lower connecting nut; 69. Lower expansion gap. Detailed Implementation

[0016] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0017] like Figs. 1-3As shown, a hinge joint reinforcing device of a hollow slab beam bridge, wherein the hollow slab beam bridge is composed of a plurality of hollow slab beams 1 arranged side by side, a hinge joint 2 is formed between two adjacent hollow slab beams 1, the hinge joint reinforcing device comprises a plurality of upper fixing plates 3, a plurality of lower fixing plates 4, a plurality of carbon fiber prestressed cable devices and channel steel 5, the number of the upper fixing plates 3, the lower fixing plates 4 and the carbon fiber prestressed cable devices is the same, each upper fixing plate 3 is fixedly arranged on the upper part of one hinge joint 2, the channel steel 5 is fixedly arranged on the bottom surface of the hollow slab beam bridge and below the upper fixing plate 3, the upper fixing plate 3 is fixed to the top surface of the hollow slab beam 1 on both sides of the hinge joint 2 through two upper fixing bars 31 with upper anchorage nuts 32, and the channel steel 5 is fixed to the bottom surface of the hollow slab beam 1 through a plurality of lower fixing bars 51 with lower anchorage nuts 52; the carbon fiber prestressed cable device comprises an upper connecting screw 61, an upper connecting anchor 62, a carbon fiber cable 63, a lower connecting anchor 64 and a lower connecting screw 65 which are sequentially fixed and connected from top to bottom, the upper connecting screw 61 passes through the upper fixing plate 3 upwardly and is fixed to the upper fixing plate 3 through an upper connecting nut 66, the upper connecting anchor 62 and the upper end opening of the hinge joint 2 form an upper expansion gap 67, the lower connecting screw 65 sequentially passes through the channel steel 5 and the lower fixing plate 4 downwardly and is fixed to the lower fixing plate 4 through a lower connecting nut 68, and the lower connecting anchor 64 and the lower end opening of the hinge joint 2 form a lower expansion gap 69. Wherein, the upper fixing bar 31 can also be arranged as a plurality of bars according to requirements.

[0018] The effect is verified by laboratory experiments, due to the limitation of laboratory space, a reduced model experiment is carried out for verification, the experimental process and result analysis are as follows: the hollow slab beam is loaded by a simulated vehicle load at single point and double points respectively, and four reinforcing methods are set: method one, only channel steel is arranged on the beam bottom; method two, channel steel and suspended carbon fiber prestressed cable device are arranged but prestress is not tensioned; method three, the method of the embodiment is adopted and the prestress of the carbon fiber prestressed cable device is tensioned to 3 tons; method four, the method of the embodiment is adopted and the prestress of the carbon fiber prestressed cable device is tensioned to 6 tons.

[0019] Compared with no reinforcement, the four reinforcing methods all improve the ability of the hollow slab beam bridge to transfer hinge joint force. In the most unfavorable state that the adjacent two hinge joints are damaged, when a load is applied to one piece of hollow slab beam, the load distribution of the piece of hollow slab beam reinforced by method four is reduced from 0.512 when no reinforcement is adopted to 0.412, the load distribution is reduced by 19.5%, therefore, the reinforcing device of the embodiment can alleviate the adverse effects of excessive local load and solve the problem that the bridge is damaged due to excessive local stress caused by hinge joint damage of the bridge.

Claims

1. A hinge joint reinforcement device for a hollow slab beam bridge, wherein the hollow slab beam bridge is composed of multiple hollow slab beams arranged side by side, and a hinge joint is formed between two adjacent hollow slab beams, characterized in that... The hinge joint reinforcement device includes multiple upper fixing plates, multiple lower fixing plates, multiple carbon fiber prestressed cable devices, and channel steel. The number of upper fixing plates, lower fixing plates, and carbon fiber prestressed cable devices is the same. Each upper fixing plate is fixedly installed over the upper part of a hinge joint. The channel steel is laterally installed across multiple hinge joints on the bottom surface of the hollow slab beam bridge and located below the upper fixing plates. The upper end of each carbon fiber prestressed cable device is fixedly connected to the upper fixing plate, and the lower end of each carbon fiber prestressed cable device passes downward through the channel steel and is fixedly connected to the lower fixing plate. The lower fixing plate is tightly attached to the bottom of the channel steel.

2. The hinge joint reinforcement device for a hollow slab beam bridge according to claim 1, characterized in that... The upper fixing plate is fixed to the top surface of the hollow slab beams on both sides of the hinge joint by at least two upper fixing ribs with upper anchor nuts, and the channel steel is fixed to the bottom surface of the hollow slab beams by multiple lower fixing ribs with lower anchor nuts.

3. The hinge joint reinforcement device for a hollow slab beam bridge according to claim 1, characterized in that... The carbon fiber prestressed cable device includes an upper connecting screw, an upper connecting anchor, a carbon fiber cable, a lower connecting anchor, and a lower connecting screw, which are fixedly connected from top to bottom. The upper connecting screw passes upward through the upper fixing plate and is fixed to the upper fixing plate by an upper connecting nut. An upper expansion gap is formed between the upper connecting anchor and the upper opening of the hinge. The lower connecting screw passes downward through the channel steel and the lower fixing plate and is fixed to the lower fixing plate by a lower connecting nut. A lower expansion gap is formed between the lower connecting anchor and the lower opening of the hinge.

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