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Method for implanting steel bar to reinforce groove-type beam bridge face plate through UHPC thin layer

A technology for bridge decks and grooved girders, applied in bridge reinforcement, bridges, bridge parts, etc., can solve the problems of complex process, high cost, long maintenance time, etc., and achieve simple construction steps, short construction period, and save input costs Effect

Inactive Publication Date: 2017-06-13
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the process used in this patent is relatively complicated, and traffic needs to be closed. The steel plate pasted on the lower part needs to invest a lot of money in anti-corrosion maintenance in the later period of use.
In addition, the UHPC used in this technology needs high-temperature steam curing after reinforcement, which takes a long time and high cost

Method used

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  • Method for implanting steel bar to reinforce groove-type beam bridge face plate through UHPC thin layer
  • Method for implanting steel bar to reinforce groove-type beam bridge face plate through UHPC thin layer
  • Method for implanting steel bar to reinforce groove-type beam bridge face plate through UHPC thin layer

Examples

Experimental program
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Effect test

Embodiment 1

[0029] A method of using UHPC thin-layer reinforcement to strengthen channel girder bridge deck, refer to the attached Figure 1-3 , the concrete of the damaged part of the Type A bridge deck 1 of the channel girder is cleaned and chiseled off, and only the undamaged part is cleaned, and then the end beams 2 on both sides of the Type A bridge deck 1 are cleaned up on the side close to the bridge deck To facilitate the implantation of steel bars 4, fold the implanted steel bars 4 into the form shown in the figure and implant the implanted steel bars 4 into the end beams 2 of the channel beam along the transverse direction of the Type A bridge deck 1, with an anchorage depth greater than 15cm. Then the formwork is set up, and the ultra-high-performance concrete UHPC3 is poured in under pressure, and the self-compacting performance of the ultra-high-performance concrete is used for self-compacting, and the ultra-high-performance concrete UHPC3 is used for super bonding with steel ...

Embodiment 2

[0032] A method of using UHPC thin-layer reinforcement to strengthen channel girder bridge decks. The specific steps are: cutting and chiseling the damaged cement concrete at the parts of the bridge deck that need to be reinforced. The thickness of the cement concrete to be chiseled is determined according to the damaged parts. The damage can only be cleaned without chiseling, and the end beams of the channel girders on both sides of the bridge deck should be cleaned; the steel bars will be implanted in the joints on both sides along the transverse direction of the channel girder deck. cm, the longitudinal spacing of steel bars is 6cm, and the anchorage depth of the steel bars implanted at the joints on both sides is 15cm; UHPC is poured to the reinforcement part in the support form, and the UHPC adopts a compressive strength of more than 180Mpa, a tensile strength of more than 7Mpa, and no need for steam curing. When UHPC and UHPC are poured, the pouring thickness at both ends...

Embodiment 3

[0034] A method of using UHPC thin-layer reinforcement to strengthen channel girder bridge decks. The specific steps are: cutting and chiseling the damaged cement concrete at the parts of the bridge deck that need to be reinforced. The thickness of the cement concrete to be chiseled is determined according to the damaged parts. The damage can only be cleaned without chiseling, and the end beams of the channel girders on both sides of the bridge deck should be cleaned; the steel bars should be implanted in the joints on both sides along the transverse direction of the channel girder deck. , the longitudinal spacing of steel bars is 10cm, and the anchoring depth of steel bars implanted at the joints on both sides is 20cm; UHPC is poured to the reinforcement part in the support form, and the UHPC adopts UHPC with a compressive strength of more than 180Mpa, a tensile strength of more than 7Mpa, and no need for steam curing , when UHPC is poured, the pouring thickness at both ends o...

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Abstract

The invention relates to a method for implanting steel bars to reinforce a groove-type beam bridge face plate through a UHPC thin layer. Particularly, super-high-strength performance of UHPC is utilized, by implanting the steel bars and pouring the UHPC, poured concrete and an original structure becomes a whole and bear force jointly. The UHPC has ultra-low permeability and high corrosion resistance, high cohesiveness with an interface, and the UHPC can form a good whole with the implanted steel bars after poured and can protect the steel bars against being rusted. The reinforced groove-type beam bridge face plate is light in self-weight and high in bend-tensile resisting strength; the ultimate bearing capacity of the reinforced structure can be improved greatly, no exposed steel bars or steel plate exist after reinforcing; later maintenance is easy, the maintenance cost is low, and a special maintenance means is not needed; early stage strength forming is fast; and the influence on traffic is little, the traffic does not need to be closed to conduct construction so that social and economic benefits are high.

Description

technical field [0001] The invention relates to the technical field of channel girder bridge deck reinforcement, in particular to a method for reinforcing channel beam bridge decks by using UHPC thin-layer planting bars. Background technique [0002] The trough girder bridge has the advantages of low building height, low noise, and simple appearance. It has a good comprehensive economic effect when applied to urban bridges, so it is widely used in urban viaducts, especially in areas where building height is limited and environmental noise is controlled. . However, due to the increase in traffic volume, the increase in load levels, and the passage of time, durability has become an important issue plaguing channel girder bridges. At present, the common diseases of trough girder bridges are mainly reflected in the cracking and deflection of the superstructure. Due to financial constraints, it is impossible to demolish and rebuild all damaged bridges. Repair and reinforcement ...

Claims

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Application Information

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IPC IPC(8): E01D22/00E01D19/12E01D101/26
CPCE01D19/125E01D22/00E01D2101/26
Inventor 叶奋宋卿卿崔玉宝王锋丁新慧
Owner TONGJI UNIV
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