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Continuous small box girder structure with combined section in hogging moment area and construction method thereof

A technology of negative bending moment area and small box girder, which is applied in the direction of bridges, bridge construction, erection/assembly of bridges, etc., can solve the problems of large shrinkage of UHPC and cannot maximize the cracking moment of the section, so as to improve the cracking moment , enhance environmental erosion resistance, and improve durability

Pending Publication Date: 2021-06-04
SHENZHEN MUNICIPAL DESIGN & RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still some problems when UHPC is used in the negative moment area of ​​continuous small box girder bridges. For example, the thickness of the UHPC bridge deck is different from that of the NC bridge deck, and the shrinkage of UHPC is large. cracking moment

Method used

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  • Continuous small box girder structure with combined section in hogging moment area and construction method thereof
  • Continuous small box girder structure with combined section in hogging moment area and construction method thereof
  • Continuous small box girder structure with combined section in hogging moment area and construction method thereof

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Effect test

Embodiment 1

[0040] Such as Figure 1-6 As shown, this embodiment provides a continuous small box girder structure with combined sections in the negative moment zone, including prefabricated NC small box girder 1, mid-support cast-in-place NC 2, A-type prefabricated UHPC channel plate 3, and B-type prefabricated UHPC channel plate 4, C-type prefabricated UHPC channel plate 5. The adjacent prefabricated NC small box girder 1 is connected as a whole through the middle fulcrum cast-in-place NC 2, and the NC channel beam 7 is connected with A-type prefabricated UHPC channel plate 3, B-type prefabricated UHPC channel plate 4, and C-type prefabricated UHPC channel plate 5 are connected together through the steel connectors 8 laid on the NC channel beam 7 . Type A prefabricated UHPC channel plate 3 and NC plate 6 are provided with steel bars 16 at the joint, Type A prefabricated UHPC channel plate 3 and B type prefabricated UHPC channel plate 4, and Type B prefabricated UHPC channel plate 4 Joi...

Embodiment 2

[0051] Such as Figure 7 As shown, this embodiment provides a continuous small box girder structure with a combined section in the negative moment area. The difference from the embodiment is that in this embodiment, the negative moment prefabricated section is replaced by a D-shaped prefabricated UHPC channel plate 17 A multi-section prefabricated panel composed of type A prefabricated UHPC channel plate 3 and type B prefabricated UHPC channel plate 4, such as Figure 8 shown. The combined cross-sectional form of the central fulcrum connecting section composed of the central fulcrum cast-in-place NC2 and the C-shaped prefabricated UHPC channel plate 5 becomes the cast-in-place UHPC connecting section 18 .

[0052] The construction method of the continuous small box girder structure with combined section in the negative moment zone includes the following steps:

[0053] 1) Prefabricated NC small box girder 1 and D-shaped prefabricated UHPC channel plate 17 are produced in the...

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Abstract

The invention discloses a continuous small box girder structure adopting a combined section in a hogging moment area and a construction method thereof. The continuous small box girder structure comprises a prefabricated NC small box girder, a middle fulcrum connecting section and a prefabricated UHPC groove-shaped plate. The prefabricated UHPC groove-shaped plate is located in a negative bending moment area of the continuous beam, an empty groove is formed in the groove-shaped plate, and a concave connecting piece and a convex connecting piece are arranged at a web plate. According to the method, the cracking bending moment and durability of concrete in the hogging moment area are remarkably improved, the problem of shrinkage cracking of cast-in-place UHPC in the hogging moment area is solved, the method can adapt to the situation that the thicknesses of the NC plate and the UHPC plate are inconsistent, formwork erection during pouring of joints between UHPC webs is omitted, the method can adapt to prefabricated small box girders of various lengths, and industrial production is facilitated.

Description

technical field [0001] The invention relates to the technical field of civil engineering, in particular to a continuous small box girder structure with combined sections in the negative moment zone and a construction method thereof. Background technique [0002] UHPC has the characteristics of high compressive and tensile strength, strong impermeability and good durability. In recent years, UHPC has been used in the lateral connection of prefabricated NC bridges, newly built full UHPC bridges, and UHPC bridge decks. The prefabricated NC bridge with UHPC lateral connection can avoid the welding of steel bars at the lateral connection and speed up the construction; the full UHPC bridge has a lower girder height, which can reduce the route elevation; the UHPC bridge deck has greater rigidity, which can solve the problem of orthogonal Fatigue cracking of heterogeneous steel bridge decks. [0003] UHPC has shown good performance in the bridge field where it is applied, and has ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E01D2/04E01D21/00
CPCE01D2/04E01D21/00
Inventor 佟兆杰姜瑞娟吴启明肖玉凤徐添华田强春朱准峰莫增模陈杰
Owner SHENZHEN MUNICIPAL DESIGN & RES INST
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