Bridge deck continuous seam structure and forming method thereof

Abstract

The invention discloses a bridge deck continuous seam structure which comprises a bridge pier and two plate beams positioned on the top surface of the bridge pier, wherein a beam end seam is formed between the two plate beams and is filled with a buffering block; hot asphalt sticking layers are arranged at the upper ends of the plate beams; rubber cushion layers are further arranged between the hot asphalt sticking layers and the beam end seam; mixed concrete layers, fiber polyester anti-cracking cloth layers and asphalt concrete layers are further arranged on the rubber cushion layers in sequence; bridge deck paving steel bar meshes and continuous seam reinforcement steel bars are arranged in the mixed concrete layers. Furthermore, the invention further discloses a forming method for the bridge deck continuous seam structure. The bridge deck continuous seam structure is formed by the steps of arranging the buffering rubber block in the beam end seam, arranging the rubber cushion layers above the plate beams, pouring the mixed concrete layers for combining the fiber anti-cracking layers and the asphalt concrete layers and the like. The bridge deck continuous seam structure is more reasonable in stress; attenuation of amplitude of the plate beams can be accelerated, and development of cracks is effectively suppressed.

Description

technical field [0001] The invention relates to a high-safety and durable bridge deck continuous seam technology, in particular to a bridge deck continuous seam structure and a forming method thereof. Background technique [0002] In recent years, many countries have developed various forms of continuous bridge deck structures of simple-supported beam bridges in order to facilitate construction, reduce project costs, and improve the timeliness, safety, and comfort of driving. Analyze and improve. For example, Wright and George E Ramey Angela studied the working state of the pavement and proposed 14 structural measures to alleviate the continuous cracks of the bridge deck, among which the effect of thickening the concrete bridge deck was mainly considered; According to the function, it can be divided into stretch absorption type, stretch dispersion type and stretch induced bridge deck continuous structure for research and design. [0003] Many scholars and engineers in our ...

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Problems solved by technology

[0004] The disadvantages of the existing technology mainly include: the design range of continuous joints on the bridge deck is a fixed value, and the range of the negative bending moment area on the top of the pier with different spans and beam heights changes with the change of the span beam height, making the structural design unreasonable; The concrete used for the joints is ordinary reinforced concrete. Under the heavy force and the frequent action of the vertical vibration of the vehicle and the staggering caused by the deformation of the prefabricated beam and slab, when the fatigue resistance of the material reaches the limit, the bridge deck will be damaged. ; Continuous joints are welded with prestressed tendons or pre-embedded steel bars in simply supported slab girders to form a continuous structure. The construction process is complex and requires high construction technology.

If CFRP bars are used, the shear resistance of CFRP bars is insufficient, and steel bars still need to be used in the structure to bear the force together, and CFRP bars have high requirements for bond length and concrete cover thickness; the geotextile installed on the top of the beam slab, It is easy to be damaged by vibration during concrete pouring, especially the geotextile of the continuous seam on the bridge deck is easy to be vibrated and cracked, causing concrete leakage, and in severe cases, the gap may be completely blocked to affect the strain of the beam slab, and even cause the beam slab to bulge; continuous The reinforcing steel bars of the joints are arranged at equal lengths, which leads to a sudden change in the structural stiffness on both sides of the section at the end of the reinforcing bars, which is prone to cracking due to stress concentration; after the continuous joints are cracked, the cracks will spread to the asphalt pavement, reducing the appearance of the bridge deck. and comfort

The damage of the asphalt pavement layer accelerates the infiltration of rainwater and other substances, resulting in carbonation of concrete, intrusion of chloride ions and corrosion of steel bars, resulting in more serious damage to continuous joints

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