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Oriented fiber UHPC (Ultra High Performance Concrete) bridge deck slab for hogging moment area of steel-concrete composite beam and preparation and construction method

A technology of steel-concrete composite beams and negative moment areas, which is applied in the manufacture of tools, bridges, bridge parts, etc., can solve the problems of high cost and waste of fiber materials, and achieve environmental protection of materials, reduction of consumption, and good continuity of structural strength and rigidity Effect

Pending Publication Date: 2022-07-29
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the material cost of the fiber is very expensive, and the current application of this inefficiency is obviously a waste

Method used

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  • Oriented fiber UHPC (Ultra High Performance Concrete) bridge deck slab for hogging moment area of steel-concrete composite beam and preparation and construction method
  • Oriented fiber UHPC (Ultra High Performance Concrete) bridge deck slab for hogging moment area of steel-concrete composite beam and preparation and construction method
  • Oriented fiber UHPC (Ultra High Performance Concrete) bridge deck slab for hogging moment area of steel-concrete composite beam and preparation and construction method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] The oriented fiber UHPC bridge deck in the negative bending moment area of ​​a steel-concrete composite beam according to the present invention, its construction method can be carried out according to the following steps:

[0062] 1) According to the calculation and analysis results of the bridge and the actual situation of the project, determine the arrangement length and thickness distribution of the directional fiber UHPC bridge deck 1 of the stepped longitudinal bridge in the negative bending moment area, and determine the arrangement of ordinary steel bars and U-shaped connecting steel bars;

[0063] 2) as Image 6 As shown, it is a schematic structural diagram of a bridge deck provided by an embodiment of the present invention. according to figure 1 For the force conditions shown, the entire negative moment length is L 0 , the total height of the bridge deck is h 0 , the maximum negative bending moment is M, and the size of the oriented fiber UHPC bridge deck i...

Embodiment 2

[0068] The oriented fiber UHPC bridge deck in the negative bending moment area of ​​the steel-concrete composite beam of the present invention, its construction method can be carried out according to the following steps:

[0069] Step 1. Determine the range of different negative bending moments in the bridge, determine the central thickness of the directional fiber UHPC bridge deck 1 in the negative bending moment area and the longitudinal thickness of the plate body; determine the width and depth of the grooves at both ends of the longitudinal direction;

[0070] Step 2, forming a pouring mold based on the size of the oriented fiber UHPC bridge deck (1) in the bending moment zone determined in step 1;

[0071] The preparation parameters of the mold are as follows: figure 1 and Image 6 The entire negative bending moment length shown is L 0 , the total height of the bridge deck is h 0 , the maximum negative bending moment is M, and the size of the oriented fiber UHPC bridge...

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Abstract

The invention relates to the technical field of bridge engineering, in particular to an oriented fiber UHPC bridge deck of a steel-concrete composite beam hogging moment area and a preparation and construction method. The concrete slabs are connected with the head end and the tail end of the hogging moment area oriented fiber UHPC bridge deck slab through U-shaped connecting steel bars correspondingly, and the bottom of the hogging moment area oriented fiber UHPC bridge deck slab is of a step structure which is symmetrically and gradually decreased upwards from the center of the slab to the two longitudinal sides. Concave grooves with downward openings are formed in the tail ends of the stepped structures at the two ends; the concrete slab is of a structure shaped like a Chinese character'ji 'formed by combining a transverse slab body and a vertical slab body. A concave groove with a downward opening is formed in the bottom end surface of the transverse plate body of the concrete plate; a concrete layer is poured in a bottom cavity formed after the hogging moment area oriented fiber UHPC bridge deck slab and the concrete slab are spliced to form a wet joint asymmetric stepped concrete layer. According to the invention, the utilization efficiency of fibers is fully improved, the consumption of fiber materials is reduced, the anti-cracking performance is improved, and meanwhile, UHPC is only adopted in a local structure, so that the economical efficiency is guaranteed.

Description

technical field [0001] The invention relates to the technical field of bridge engineering, in particular to an oriented fiber UHPC bridge deck in a negative bending moment area of ​​a steel-concrete composite beam and a preparation and construction method. Background technique [0002] When the steel-concrete composite continuous beam is in the negative moment area of ​​the fulcrum, the upper concrete deck is under tension and the lower steel beam is under compression, and the concrete slab is easy to crack. In order to control the cracking of concrete bridge decks in the negative moment area, the commonly used methods include preloading method, prestressing method and increasing concrete reinforcement ratio. However, for concrete bridge decks, it is difficult to apply prestress, the application efficiency is low, and it is easy to lose. Oriented fiber UHPC (Ultra High Performance Concrete) has ultra-high mechanical properties, ultra-high durability, excellent wear resist...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E01D19/12E01D21/00B28B1/52B28B23/02
CPCE01D19/125E01D21/00B28B23/02B28B1/523E01D2101/262
Inventor 杨明黄作政陈兴年柳斐张超熊永明
Owner SOUTHEAST UNIV
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