Construction method for midspan closure segment of longspan continuous rigid frame bridge

Abstract

The invention discloses a construction method for the midspan closure segment of a longspan continuous rigid frame bridge, which is characterized by comprising the following steps: (a) adopting a hanging basket cantilever pouring method, and constructing a cantilever beam section in front of the closure segment; (b) disassembling the hanging basket, manufacturing components disassembled from the hanging basket into a cradle, and installing the cradle on the two beam sections of the midspan closure; (c) carrying out equivalent counterweight; and (d) supporting the beam. The traditional hanging basket is utilized in the closure process instead of manufacturing the cradle again. After the traditional hanging basket system is disassembled and combined again, the closure cradle is formed, thereby guaranteeing the design requirement, improving the working efficiency and saving fund. The construction method for the midspan closure segment is suitable for constructing of the same type of suspended irrigation closure. The traditional hanging basket is modified without additionally adding the cradle, the self weight is lightened, and the problem that the upper limit requirement of the total amount of the additional loading amount of the closure segment is exceeded if the hanging basket is directly used for closure.

Description

technical field [0001] The invention relates to a construction method of a continuous rigid frame bridge, in particular to a construction method of a mid-span closure section of a long-span continuous rigid frame bridge. Background technique [0002] In the prior art, the cantilever pouring of large-span box girders is mainly divided into the following three parts: [0003] The first part is the construction of the 0# section: the pier top beam section (that is, the 0# section) is poured on the pier top bracket or false frame and the pier beam is temporarily consolidated; the 0# section is the one with the largest height and the heaviest weight among all the beams , and it is on the top of the pier column, so it is not necessary to use the hanging basket for construction. [0004] The second part is the construction of the cantilever pouring part: using the cantilever pouring method, install the cantilever hanging basket on the 0# section, and pour the main beam to the fron...

AI Technical Summary

Problems solved by technology

[0025] 1. The installation process of the hanger is cumbersome and requires a long construction period; it takes a long time to switch between the bottom mold of the hanger at the bottom of the box girder and the bottom mold of the hanging basket, and there are great safety hazards during the conversion process

[0026] 2. It adopts the combination of hanging basket and hanger. Its self-heavy weight can easily exceed the upper limit of the total weight of the additional load of the closing section.

[0027] 3. The hanger needs to be manufactured and installed separately, and the cost is high

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