Method for block-by-block casting of concrete continuous beam bridge by using military truss shift mould

Abstract

The invention relates to a method for block-by-block casting of a concrete continuous beam bridge by using a military truss shift mould. The method is characterized by comprising the following steps of: firstly, dividing a full-span concrete continuous beam with span of L into two segmented box girders, casting the segmented box girder A located on a bridge pier and tensioning the prestress on the upper edge of the segmented box girder A; secondly, transferring withdrawn templates to the segmented box girder B located at the middle span and pouring after the segmented box girder A is cast completely, tensioning the linkage prestress of the segmented box girder A and the segmented box girder B and the prestress on the lower edge of the segmented box girder B after the strength is achieved, finally, transferring the withdrawn templates to the segmented box girder A of the next span to cast. The cross section of the concrete continuous beam can be of a single-box single-chamber type, a single-box two-chamber type, a single-box three-chamber type, a single-box four-chamber type, a single-box fifth-chamber type or a single-box six-chamber type; the bridge pier adopts a non-cover beam column structure comprising a single-column bridge pier, a dual-column bridge pier or a three-column bridge pier. Due to the adoption of the method for block-by-block casting of the concrete continuous beam bridge by using the military truss shift mould, only one set of military truss beam construction equipment with light weight, convenience in mounting / dismounting and good universality is used in construction, high construction speed and a short construction period are realized, and the majority of the members can be used repeatedly, so that good quality, cost reduction and investment saving are realized.

Description

technical field [0001] The invention relates to a pouring method for a concrete continuous girder bridge, in particular to a method for pouring a concrete continuous girder bridge by moving molds for military trusses. Background technique [0002] Simply supported girder bridges have always been the main bridge type of small and medium-span highway bridges because of their simple process and low material consumption. Due to the poor integrity of the prefabricated strips, an additional 10cm thick reinforced concrete bridge deck must be poured on it. With the development of high-grade highways in China, and the new bridge design specification clearly stipulates that "the design reference period of highway bridges and culverts is 100 years", simply supported girder bridges have many joints, water leakage, vehicle jumping, poor operating performance and durability. Poor sex is not included in the guarantee. The prestressed concrete continuous beam bridge has the characteristic...

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Problems solved by technology

However, at present, the whole-hole pouring method is adopted in the construction of "moving formwork" at home and abroad. Based on the bridge width of 16m and the average thickness of the box girder D = 0.5-0.6m, the self-weight of a continuous beam with a span of 30-50m G0 = 600 -1200(t), the bending moment of the longitudinal steel beams of the mold shifting is as high as M0=2000-7000(t m), and the number of Bailey truss pieces required is as many as m=30-100 pieces, so that in the transverse width This is why it is difficult to popularize Bailey's mold shifting

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