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A method for adjusting the weight of filling on the arch of a masonry arch bridge by region

A masonry arch bridge, sub-regional technology, used in bridges, bridge construction, bridge maintenance and other directions, can solve the problems of unadjustable, difficult to achieve ideal state, non-continuous distribution of dead loads, etc., to facilitate construction and reduce bridge deck paving. The effect of pretending to be diseased and saving the compaction process

Active Publication Date: 2016-06-01
GUANGXI TRANSPORTATION SCI & TECH GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But in fact, when the structure on the arch is hollow, the dead load is not continuously distributed, and the dead load pressure line is not a smooth curve, so it is difficult to achieve the ideal state where the arch axis coincides with the dead load pressure line
In the design of new bridges, the five-point coincidence method is generally adopted, that is, the arch axis coincides with the pressure line at the vault top, two 1 / 4 arch spans, and two arch feet. However, for old arch bridges that need to be reinforced, the arch axis Already determined, cannot be adjusted
At present, there is no relevant research on the adjustment of the pressure line of the arch axis by using lightweight aggregate concrete as the filler on the arch

Method used

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  • A method for adjusting the weight of filling on the arch of a masonry arch bridge by region
  • A method for adjusting the weight of filling on the arch of a masonry arch bridge by region
  • A method for adjusting the weight of filling on the arch of a masonry arch bridge by region

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Embodiment 1

[0036] as attached figure 1 and 2 As shown, a certain bridge is a variable-section catenary vierendeel double-curved arch bridge with a span of 100 meters and a net loss height of 12.24 meters. The width of the bridge is 20.2 meters. , the thickness of the vault is 1.4 meters, and the thickness of the arch foot is 2.26 meters.

[0037] This embodiment is an old bridge reinforcement project, including the main arch ring 1, the belly arch ring 2, the filler layer 3 on the arch and the bridge deck 4. The vault area 31 is between the main arch ring 1 and the bridge deck 4, and the belly arch ring 2 Between the bridge deck 4 is the belly arch area 32; the filling density of the vault area is 800kg / m 3 ~1200kg / m 3 lightweight concrete filler, the apparent density of the belly arch area is 1200kg / m 3 ~1950kg / m 3 Lightweight concrete filler or ordinary soil filler; lightweight concrete filler is concrete made of lightweight aggregate or ordinary sand, with cement and water. Among...

Embodiment 2

[0050] as attached figure 1 and 2 As shown, the span of a new bridge is 57.622 meters, and the net loss is 9.568 meters. Net (7+2×0.43) meters.

[0051] This embodiment is designed for the filling on the arch of a new bridge, including the main arch ring 1, the belly arch ring 2, the filling layer 3 on the arch and the bridge deck 4. There is a vault area 31 between the main arch ring 1 and the bridge deck 4, and the belly arch Between the circle 2 and the bridge deck 4 is the belly arch area 32; the filling density of the vault area is 800kg / m 3 ~1200kg / m 3 lightweight concrete filler, the apparent density of the belly arch area is 1200kg / m 3 ~1950kg / m 3 lightweight concrete filler or ordinary soil filler; lightweight concrete filler is light coarse aggregate, light fine aggregate or ordinary sand, mixed with cement and water to form concrete, wherein the lightweight aggregate can be fly ash ceramsite, Clay ceramsite, shale ceramsite, pumice or scoria, spontaneous combu...

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Abstract

The invention discloses a method for adjusting the weight of fillers on a masonry arch bridge in a partitioning manner. The masonry arch bridge comprises a main arch ring (1), spandrel arch rings (2), a filler layer (3) on arches, and a bridge panel (4). The method comprises the steps: the filler layer (3) on the arches is divided into an arch top area (31) and spandrel arch areas (32), wherein the arch top area (31) is formed between the main arch ring (1) and the bridge panel (4), and the spandrel arch areas (32) are formed between the spandrel arch rings (2) and the bridge panel (4); lightweight concrete fillers with the apparent density from 800kg / m3 to 1200 kg / m3 are filled into the arch top area (31), and lightweight concrete fillers or ordinary soil quality fillers with the apparent density from 1200kg / m3 to 1950 kg / m3 are filled into the spandrel arch areas (32); and the weight of the filler layer (3) on the arches is adjusted by calculating three objective functions, i.e. bending moments Md, M1 / 4 and Mj generated by the main arch ring on the arch top, the one quarter of an arch span, and arch feet, and the like. The method has the advantages that the utilization efficiency of arch ring materials can be improved, the distribution of the internal force of the main arch ring is improved, and the carrying capacity of the arch bridge is improved.

Description

technical field [0001] The invention belongs to the fields of bridge structure design, reinforcement of old bridges and material selection, and in particular relates to a method for adjusting the weight of fillers on masonry arch bridges in different regions. Background technique [0002] Arch bridge is a type of bridge commonly used on highways in our country. It is mainly composed of the main arch ring and the buildings on the arch. The main arch ring is the structure that mainly bears pressure. Masonry materials (stone, concrete, brick, etc.) are used to build arch bridges, and arch bridges made of such masonry materials are also called masonry arch bridges. Looking back at the design process of the arch bridge, the arch axis of the main arch ring is the control link of the design. The ideal mode of the main arch ring is that the arch axis coincides with its dead load pressure line, so that under the action of constant load, the main arch ring only has axial force , the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E01D21/00E01D22/00
Inventor 张云周晓蓉马玥彭荣生邱波黄秀凤李春春
Owner GUANGXI TRANSPORTATION SCI & TECH GRP CO LTD
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