Gradient reinforced seamless bridge connection pavement structure

Abstract

The present invention discloses a gradient reinforced seamless bridge connection pavement structure, comprising a bridge deck and a gradient reinforced connection pavement, wherein the bridge deck is arranged on a main beam, the bridge deck is connected to the gradient reinforced connection pavement through connection pavement connecting steel bars, the gradient reinforced connection pavement is provided with reinforcement in a manner of increasing interval gradient, one end of the gradient reinforced connection pavement is placed on the abutment, and the other end is connected to the pavement and anchored through the ground beam. The present invention eliminates the bonding interface after the slab is laid in the general connection pavement and does not set expansion joints, expansion joints and other joints, which can significantly improve the service durability and driving comfort of the road-bridge connection related structure, extend the service life of the bridge, and reduce the full life cycle cost of the bridge.

Description

Technical Field

[0001] The invention relates to a bridge structure, in particular to a gradient reinforced fully seamless bridge connection pavement structure. Background Art

[0002] Bridge structures generally need to set expansion joints to meet the requirements of beam expansion and deformation. However, since expansion joints are set at the joints between two adjacent beam ends, between beam ends and abutments, they are often the weak links of bridge structures under the effects of structural deformation, load impact and environmental erosion. The characteristics of expansion joints that are easy to damage and difficult to repair make the development of bridge seamless technology an inevitable trend in bridge structure design. At present, in the conventional practice of seamless bridges, the expansion joints at both ends of the bridge can be transferred to the space between the slab and the road surface, that is, the road-bridge joint is set to absorb the deformation of the beam body. Although this practice transfers the deformation of the beam end to the road-bridge joint, which prolongs the service life of the main structure of the bridge to a certain extent, the road-bridge joint after the slab is still prone to damage or even failure. On this basis, the continuous reinforced concrete seamless connection pavement proposed as an improvement has the problem of interface bonding between the slab and the connection pavement on the one hand, and the construction of prefabricated joints is relatively complicated on the other hand. Summary of the invention

[0003] Purpose of the invention: The purpose of the present invention is to provide a gradient reinforced seamless bridge connection pavement structure to solve the problem that the expansion joint of the bridge affects the service life of the bridge and the interface at the road-bridge connection is inconvenient to bond.

[0004] Technical solution: The gradient reinforced fully seamless bridge connection pavement structure described in the present invention includes a bridge deck and a gradient reinforced connection pavement. The bridge deck is arranged on the main beam, and the bridge deck is connected to the gradient reinforced connection pavement through the connection pavement connecting steel bars. The gradient reinforced connection pavement is provided with reinforcement in a manner of increasing interval gradient. One end of the gradient reinforced connection pavement is placed on the abutment, and the other end is connected to the pavement and anchored through the ground beam.

[0005] In order to increase driving comfort, a continuous asphalt paving layer is provided on the bridge deck, gradient reinforced connection road surface and road surface.

[0006] It is ensured that the non-reinforced area of ​​the gradient reinforced connection pavement absorbs all deformations of the beam body. The gradient reinforced connection pavement and the ground beam are cast into one piece through high-performance ECC materials and connected with steel bars through the ground beam for anchoring.

[0007] To prevent uneven settlement and sudden change in stiffness, micropiles are arranged under the denser area in the reinforcement zone of the gradient reinforcement connection pavement, and a pillow beam is arranged at the end of the reinforcement zone.

[0008] To meet the need of deformation transmission, a sliding layer is provided between the abutment and the gradient reinforced connection road surface, and the sliding layer is a polytetrafluoroethylene plate.

[0009] To reduce longitudinal friction, an isolation layer is provided under the gradient reinforced wiring pavement, and the end of the isolation layer is in the same vertical position as the ground beam connecting steel bars, and the isolation layer is a geotextile.

[0010] The gradient reinforcement connection road surface is connected to the ground through a bonding layer.

[0011] Beneficial effects: The present invention eliminates the bonding interface after the slab is laid in the general connection road surface and does not set expansion joints, expansion joints and other joints, which can significantly improve the service durability and driving comfort of the road-bridge connection related structures, extend the service life of the bridge, and reduce the full life cycle cost of the bridge. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 1 is a schematic diagram of the structure of the present invention taking a semi-integral bridge as an example;

[0013] Figure 2 It is a structural schematic diagram of the present invention taking an integral bridge as an example. DETAILED DESCRIPTION

[0014] The present invention will be further described below in conjunction with the accompanying drawings.

[0015] like Figure 1-2 As shown, the gradient reinforced seamless bridge connection pavement structure comprises a bridge deck 2, a gradient reinforced connection pavement 6 and a pavement 11. A continuous asphalt pavement layer 1 is provided on the bridge deck 2, the gradient reinforced connection pavement 6 and the pavement 11. The bridge deck 2, the gradient reinforced connection pavement 6 and the pavement 11 are connected to the connection pavement through the bridge deck and the connection pavement connecting steel bars 14 and the bonding layer 12 in sequence. The end of the gradient reinforced connection pavement close to the main beam 3 is placed on the abutment 4, and the end away from the main beam is anchored through the ground beam 9 。The gradient reinforced wiring pavement can be divided into a dense reinforcement area, a common reinforcement area, and an unreinforced area. The abutment adopts a semi-integral abutment or an integral abutment. The gradient reinforced wiring pavement and the ground beam are integrally cast in place through high-performance ECC materials, and the gradient reinforced wiring pavement and the ground beam are connected by steel bars 18 to ensure that the unreinforced area of ​​the gradient reinforced wiring pavement absorbs all deformations of the beam body. The dense reinforcement area of ​​the gradient reinforced wiring pavement is provided with dense bidirectional steel bars 15, the common reinforcement area is provided with common bidirectional steel bars 16, and the unreinforced area is not provided with steel bars. No pre-stressed joints are provided on the upper and lower surfaces of the gradient reinforced wiring pavement, so that the wiring pavement has sufficient rigidity and simplifies the construction process. Micro piles 7 are provided under the dense reinforcement area of ​​the gradient reinforced wiring pavement to prevent uneven settlement, and a pillow beam 8 is provided at the end of the common reinforcement area to prevent sudden changes in rigidity. A sliding layer 5 is provided between the abutment and the gradient reinforced wiring pavement to meet the needs of deformation transmission. The sliding layer 5 is a polytetrafluoroethylene plate. An isolation layer 13 is provided under the gradient reinforced wiring pavement, and the end and the gradient reinforced wiring pavement and the ground beam connecting steel bar are in the same vertical position, so as to reduce the longitudinal friction resistance, and the isolation layer 13 is a geotextile. The road base layer 10 is generally a lean concrete layer and a cement stabilized crushed stone base layer, which can provide reliable bearing capacity for the wiring pavement.

Claims

1. A gradient reinforced seamless bridge connection pavement structure, characterized in that: The invention comprises a bridge deck (2) and a gradient reinforced wiring pavement (6), wherein the bridge deck (2) is arranged on a main beam (3), the bridge deck (2) is connected to the gradient reinforced wiring pavement (6) via wiring pavement connecting steel bars (14), the gradient reinforced wiring pavement (6) is provided with reinforcement in a manner of increasing intervals by gradient, the gradient reinforced wiring pavement comprises a densely reinforced area, a common reinforced area, and a non-reinforced area, one end of the gradient reinforced wiring pavement (6) close to the densely reinforced area is placed on the abutment (4), and the other end is connected to the pavement (11) and anchored via a ground beam (9); the gradient reinforced wiring pavement (6) and the ground beam (9) are cast into one piece with high-performance ECC material and anchored via ground beam connecting steel bars (18); the gradient reinforced wiring pavement (6) and the pavement (11) are connected via an adhesive layer (12); Micropiles (7) are arranged under the densified area in the reinforcement zone of the gradient reinforced wiring pavement (6), and a bolster (8) is arranged at the end of the reinforcement zone; a sliding layer (5) is arranged between the abutment (4) and the gradient reinforced wiring pavement (6), and the sliding layer (5) is a polytetrafluoroethylene plate; an isolation layer (13) is arranged under the gradient reinforced wiring pavement (6), and the end of the isolation layer (13) is at the same vertical position as the ground beam connecting steel bars (18), and the isolation layer (13) is a geotextile.

2. The gradient reinforced seamless bridge pavement structure according to claim 1 is characterized in that: A continuous asphalt paving layer (1) is provided on the bridge deck (2), the gradient reinforced connection road surface (6) and the road surface (11).

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