Construction method of large prefabricated prestressed concrete continuous T-beam across the operating railway

Abstract

The invention relates to an operating-railway-crossing construction method for a large assembly-type prestress concrete continuous T beam. The construction method is characterized by including the steps of bridge girder erection machine hole passing, high-strength protective net installing and geotextile laying, beam-erection in-place of a bridge girder erection machine, diaphragm plate steel bottom plate installing, diaphragm plate steel bar connecting, diaphragm plate side face steel plate installing, wet joint steel bottom plate installing, wet joint steel bar connecting, concrete pouring, high-strength protective net dismantling, and support converting. According to the construction method for operating railway protection, T beam erecting and transverse connecting, it is only necessary to block a railway when beam erection of the bridge girder erection machine is performed, other construction steps can be performed without interrupting operation because effective protective procedures are adopted, influences on the operating railway are small, construction speed is high, construction efficiency is remarkably improved, and good technical and economical benefits are obtained.

Description

technical field [0001] The invention relates to a construction method of a large-scale assembled prestressed concrete continuous T-beam spanning an operating railway, belongs to the field of bridge engineering, and is suitable for erecting a continuous girder bridge spanning an operating railway, a highway, and a continuous girder bridge under strict safety control. Background technique [0002] The methods commonly used in the erection of large-scale prestressed concrete T-beams include bridge erecting machines, gantry cranes, truck cranes or crawler cranes, and various combined beam erection methods. For the construction of girders across the operating railway, it is obvious that the gantry crane, truck crane or crawler hanger girder method is not suitable, and the bridge girder construction method has the characteristics of strong spanning ability, fast speed and wide application range, and is being widely used The erection of this type of flyover girder bridge is under c...

AI Technical Summary

Problems solved by technology

[0003] For the construction of prefabricated T-beams above the operating railway, the horizontal concrete pouring connection between the T-beams needs to support the formwork, and the use of the conventional formwork system needs to solve the problem of supporting and dismantling the formwork. Due to the existence of the operating railway under the span, construction machinery No access, it is extremely inconvenient to use hanging baskets for construction from the bridge deck, and there are great safety hazards, which will affect the construction period and increase the cost

In addition, from the construction of the T-beam erection to the construction of the wet joints between the T-beams and the joints of the diaphragm, in order to prevent foreign objects from falling onto the railway, it is necessary to suspend the railway operation for a long time, which seriously affects the normal operation of the railway.

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