Box beam considering external prestressed strengthening and prestressed strengthening method thereof

Abstract

A box beam considering external prestressed strengthening comprises a bottom plate, a top plate, a flange plate and two web plates; a plurality of reinforced concrete blocks are fixedly arranged on the upper surface of the bottom plate and/or the internal side surfaces of the web plates; all reinforced concrete blocks are placed in the front-and-back direction in a spaced manner; a plurality of corrugated pipes which are through from front to back are embedded in the reinforced concrete blocks; prestressed steel strands correspondingly penetrate into the corrugated pipes of the reinforced concrete blocks; and anchorage devices for anchoring the two ends of the prestressed steel strands are correspondingly arranged on the reinforced concrete blocks at the front end and the back end. The invention further discloses a prestressed strengthening method of the box beam considering the external prestressed strengthening. According to the box beam considering the external prestressed strengthening, the pressure stress reserve in a bridge midspan is increased, the bridge rigidity is recovered and enhanced, the profile of a bridge is improved, the downwarping of the bridge is controlled, secondary construction is avoided, the external prestressed strengthening construction period is reduced, the construction quality is guaranteed, the construction condition is improved, requirements on raw materials and places during reconstruction are reduced, and an important instruction effect on environment protection is realized.

Description

technical field [0001] The invention belongs to the technical field of civil engineering structure design and construction, and in particular relates to a box girder considering external prestress reinforcement and a prestress reinforcement method thereof. Background technique [0002] In recent years, my country's highway construction has developed rapidly. By the end of 2017, the total mileage of highways opened to traffic had exceeded 4.6 million kilometers, realizing a major leap from "initial connectivity" to "coverage network". The first one. The transportation system is a lifeline project related to the national economy and the people's livelihood, and the bridge structure is a key hub for the normal operation of the lifeline project. Its service quality and service life level are particularly important to ensure the healthy development of my country's transportation industry. Prestressed concrete box girder has been widely used in bridge construction in my country be...

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Problems solved by technology

[0004] The traditional external prestressing is arranged outside the constructed section, which can solve the problem of excessive downward deflection of the main span to a certain extent, but due to the influence of the self-weight of the concrete steering block (tooth block), it will cause additional loss of deflection, and the secondary The construction space, construction quality and construction period cannot be guaranteed

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