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A seamless bridge structure and construction method based on ultra-high toughness cement-based composite materials

A composite material and seamless bridge technology, applied in bridges, bridge construction, bridge parts, etc., can solve problems such as stress cracking in negative bending moment areas, achieve the effects of improving stress conditions, improving earthquake resistance, and enhancing integrity

Active Publication Date: 2022-07-26
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The present invention greatly improves the stress condition of the bridge by arranging a T-shaped connecting member of ECC material between two adjacent girders, arranging a layer of ECC material board on the end of the bridge and above the abutment, and using a cantilevered ground girder at the same time. It improves the driving comfort and the stability and durability of the bridge, solves the problems existing in the bridge expansion device, and solves the problem of stress cracking in the negative bending moment area of ​​the current seamless bridge structure

Method used

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  • A seamless bridge structure and construction method based on ultra-high toughness cement-based composite materials
  • A seamless bridge structure and construction method based on ultra-high toughness cement-based composite materials
  • A seamless bridge structure and construction method based on ultra-high toughness cement-based composite materials

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Embodiment 1

[0056] A seamless bridge structure based on ultra-high toughness cement-based composite materials, taking a bridge with a total span of 20m as an example, such as figure 1 As shown, it includes bridge pier 1, bridge abutment 2, main beam 3, T-shaped connecting member 6, ECC connecting plate 9 and cantilevered ground beam 11;

[0057] A T-shaped connecting member 6 of ECC material is cast in place at the gap between two adjacent main beams 3 . The cross-sectional structure of the ECC material T-type connecting member 6 is as follows: figure 2 As shown, the T-shaped connecting member 6 is composed of a web plate and a flange plate. The flange plate is the horizontal horizontal part of the T-shaped and is located on the upper surface of the main beam 3; At the gap between the main beams 3; in the flange plate, the reinforcement is respectively reinforced along the longitudinal and lateral directions of the bridge to form a steel mesh; the length of the longitudinal reinforcemen...

Embodiment 2

[0074] A construction method for a seamless bridge structure based on ultra-high toughness cement-based composite materials (that is, the seamless bridge structure in Embodiment 1), comprising the steps of:

[0075] 1. Prepare steel, concrete, ECC and other materials, of which the ECC ratio per cubic meter is: water 325kg / m 3 , cement 568kg / m 3 , fly ash 682kg / m 3 , quartz sand 455kg / m 3 , polycarboxylate superplasticizer 10kg / m 3 , hydroxypropyl methylcellulose thickener 0.57kg / m 3 , Japan Kuraray PVA fiber 26kg / m 3 . Cast-in-place foundation, pier 1, abutment 2 and other structures;

[0076] 2. Prefabricate the main beam 3 and preset the stud connector 8 and the anchoring steel bar;

[0077] ① Pre-set U-shaped steel bars at the junction of the beam ends of the main beams 3 of different spans to connect the main beams 3 of different spans to complete the system conversion from simply supported beams to continuous beams;

[0078] ② In advance, fix a row of stud connect...

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Abstract

The invention provides a seamless bridge structure and a construction method based on ultra-high toughness cement-based composite materials. The present invention greatly improves the stress condition of the bridge by arranging a T-shaped connecting member of ECC material between two adjacent beams, arranging a layer of ECC material plate on the end of the bridge and above the abutment, and using a cantilevered ground beam at the same time. It improves the driving comfort and the stability and durability of the bridge, solves the problems existing in the bridge expansion device, and solves the current problem of stress cracking in the negative bending moment area of ​​the seamless bridge structure.

Description

technical field [0001] The invention relates to a seamless bridge structure and a construction method based on an ultra-high toughness cement-based composite material, belonging to the field of highway bridge structures and construction. Background technique [0002] Bridges usually need to set expansion joints to meet the temperature and deformation requirements under load, engineering practice shows that expansion joints are the weakest part of the bridge structure. Expansion joints are exposed to the atmosphere and are directly subjected to the repeated impact of vehicle loads. A slight defect or deficiency will cause undesirable phenomena such as vehicle jumping, and in severe cases, it will also affect the bridge structure itself and the safety of life and property of passers-by. In response to such problems, solutions for seamless bridges have been proposed at home and abroad. In traditional seamless bridges, the expansion joint is moved from the abutment to the end o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E01D1/00E01D19/00E01D21/00
CPCE01D1/00E01D19/00E01D21/00Y02A30/30
Inventor 孙仁娟鲁纬管延华崔凯葛玉宁张洪智葛智庄培芝李永浩田育禾陈传松窦柳洋
Owner SHANDONG UNIV
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