Bridge widening splicing structure and its construction method

Abstract

The invention relates to a bridge widening splicing structure and a construction method thereof. The present invention adopts the design principle of "connecting at the top and not connecting at the bottom", that is, the wet joint of cast-in-situ concrete is realized between the upper hollow slabs of the new and old bridges, the bridge deck is continuous, and the lower piers and foundations are no longer connected, and they are relatively independently stressed. To adapt to the differential settlement between the new and old bridges; the outer side plate of the old bridge is replaced, and the pier cover beam is not removed, only the anti-collision guardrail of the old bridge is removed. After the old bridge plate is replaced, the plate is replaced next to the old bridge The edge of the rear beam slab is connected with the beam slab of the new bridge by planting bars, so that the old and new bridges form a solid whole. The inventive method combines many advantages such as simple construction, short construction period, low construction cost, new and old bridges are formed into a whole to bear the force together, etc. The hollow slabs can be replaced by centralized prefabrication and factory construction, and are suitable for highway bridges of all grades. Wide construction, in line with the requirements of building energy saving, building a resource-saving, environment-friendly society, after promotion, it has good economic benefits and social value.

Description

technical field [0001] The invention relates to the field of building technology, in particular to a bridge widening splicing structure and a construction method thereof. Background technique [0002] Since the reform and opening up, my country's transportation industry has developed rapidly and vigorously, and the traffic capacity and service level of highways have been greatly improved and enhanced. my country has built more than 32,000 kilometers of expressways in less than 20 years, most of which are four-lane. However, with the rapid development of my country's economy and the rapid growth of car ownership, the capacity of expressways built in the early days is becoming increasingly saturated, and some four-lane expressways can no longer meet the growing demand for traffic. To cut off the traffic, there is an urgent need to renovate and expand these expressways, widening from four lanes to six or eight lanes, and improving its traffic capacity has become a top priority....

AI Technical Summary

Problems solved by technology

However, due to the technical standards of old and new expressway bridges, geological characteristics, traffic volume and operating range, many expressways built in the early stage cannot effectively solve the uneven settlement of old and new bridges after bridge widening. problems, resulting in high post-maintenance costs for the widened bridge

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