Method of prestressed steel wire mesh polymer mortar reinforcing concrete ribbed arch bridge

A prestressed steel strand and reinforced concrete technology, applied in bridge reinforcement, bridge, bridge construction, etc., can solve the problems of rib arch bridge without reinforced concrete, column concrete damage, concrete honeycomb, etc., to improve bearing capacity and flexural rigidity , small changes in appearance size and shape, and obvious reinforcement effect

Pending Publication Date: 2017-08-29
NINGBO INST OF TECH ZHEJIANG UNIV ZHEJIANG
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the limitations of construction technology at that time, and with the development of economic construction, the traffic volume continued to increase, and the phenomenon of overloading and exceeding the limit intensified, a series of diseases have emerged, such as cracking of arch ribs, local concrete honeycomb and pitting of arch ribs. , damage, damage and cracks at the joints between the transverse beam and the arch rib, and partial damage, peeling, and exposed reinforcement of the column concrete have seriously affected the daily traffic operation of our country, thereby hindering the normal development of the national economy and social stability.
[0003] But so far there is no systematic technology that can be used to guide the reinforcement treatment of reinforced concrete rib arch bridges

Method used

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  • Method of prestressed steel wire mesh polymer mortar reinforcing concrete ribbed arch bridge
  • Method of prestressed steel wire mesh polymer mortar reinforcing concrete ribbed arch bridge
  • Method of prestressed steel wire mesh polymer mortar reinforcing concrete ribbed arch bridge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0065] The bridge adopts a ribbed arch structure, the span of the main arch ring is 48.0m, the net sag is 6m, the bridge deck is 7m wide, and the design load is 20 for cars and 120 for trailers. The design of the main arch ring - the rectangular arch rib 1 of equal cross-section is adopted, the rib height is 1.0m, and the width is 2.0m. It is a double-rib structure. Due to the increasing traffic load, the arch rib 1 arch foot, the arch top, and 1 / 4 of the arch rib are cracked.

[0066] For the actual situation of the bridge and the requirements of the owner, our team adopted the self-developed prestressed steel strand mesh 2-polymer mortar reinforcement method for the whole bridge reinforcement design.

[0067] 1. Steel bar length value

[0068] by the formula

[0069]

[0070] Since the bridge is a flat arch, take the larger value; Lg=2.67m. Considering the simplicity of construction, the length of the steel bar is adjusted to 2.0m in actual construction.

[0071] 2. T...

example 1

[0081] Example 1: Strength Test of Confined Concrete Axial Compression Members

[0082] The key point of improving the bearing capacity of the hoop-prestressed steel strand mesh 2 to the reinforced concrete arch rib 1 is to increase the concrete strength in the press zone, so a set of hoop-prestressed steel strand mesh 2 is designed to constrain the prime concrete column axis Pressure performance test.

[0083] Component design: 150mm×150mm×450mm, the concrete strength is C25, and the reinforcement spacing is 37.5mm. A total of 5 component tests are carried out, one of which is a comparative unreinforced specimen. The experimental variable is the prestress level, which is 0, 10%, 20%, and 30%, respectively.

[0084] test results:

[0085]

[0086] It can be seen from the above table that the concrete strength of the reinforced member has been significantly improved, and the improvement range increases with the increase of the prestress level. It is verified from the compo...

example 2

[0087] Example 2: Structural test of arch rib 1

[0088] arch rib 1 design

[0089] like Figure 5 As shown, the span m of the arch rib 1 is 3500mm, the height n is 700mm, the span loss ratio is 1 / 5, the cross-sectional size of the arch rib 1 is 150mm×150mm, and the pouring concrete strength is C25. The main reinforcement adopts HPB235 steel bar with a diameter of The stirrup is made of HPB235 steel bar with a diameter of The stirrup spacing is 130mm, and the concrete cover thickness is 25mm.

[0090] Reinforced design:

[0091] The arch rib 1 is reinforced for the whole bridge, and the prestressed steel strands with a spacing of 37.5mm are arranged in the circumferential direction. The tension degree of prestress is 20% of the tensile strength of the steel strands. mm galvanized steel wire rope.

[0092] test results:

[0093]

[0094]

[0095] The test results prove that this reinforcement method is also very effective for the reinforcement of the actual reinf...

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Abstract

The invention discloses a method of prestressed steel wire mesh polymer mortars reinforcing a concrete ribbed arc bridge. The method comprises a plurality of reinforcing systems which are distributed along a concrete arch bridge arch rib to be reinforced, each reinforcing system comprises multiple rows of steel wire meshes which are arranged at intervals, formed by prestressed steel wires and coat the concrete arch rib to be reinforced in a ring direction, first fixation members which are used for fixing one ends of the steel wire meshes and forming unit construction segments, and second fixation members which are used for fixing the other ends of the steel wire meshes and are arranged parallel to the first fixation members at intervals, and widths of a strain equipment which is used for stretch-drawing and fixing the first fixation members and the second fixation members are reserved between the first fixation members and the second fixation members. The method of the prestressed steel wire mesh polymer mortars reinforcing the concrete ribbed arc bridge is simple and convenient in construction and short in period, does not need large-scale machines and tools and equipment, and is obvious in reinforcing effect and good in durability.

Description

technical field [0001] The invention relates to the reinforcement field of concrete rib arch bridges, in particular to a method for reinforcing reinforced concrete rib arch bridges with prestressed steel strand net polymer mortar. Background technique [0002] Reinforced concrete rib arch bridge is composed of two or more separated parallel arch ribs and a bridge deck system supported by columns and beams set on the arch ribs. It is a main type of arch bridge; Develop more potential bridge types. This bridge type has the advantages of light weight of arch ribs, large spanning capacity, simple bridge structure, and low cost. It has been widely used in western my country since the 1990s. Due to the limitations of construction technology at that time, and with the development of economic construction, the traffic volume continued to increase, and the phenomenon of overloading and exceeding the limit intensified, a series of diseases have emerged, such as cracking of arch ribs,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E01D22/00
CPCE01D22/00
Inventor 王银辉陈闯王小荣李应根俞楠罗征
Owner NINGBO INST OF TECH ZHEJIANG UNIV ZHEJIANG
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