Special-shaped steel cofferdam

Abstract

The invention discloses a special-shaped steel cofferdam applied to bridge pier and abutment foundation construction of a complex riverbed terrain. The special-shaped steel cofferdam comprises a steel cofferdam (17); the peripheral lower end of the steel cofferdam (17) is special-shaped; and after the steel cofferdam (17) is laid down and arranged in place, the peripheral lower end of the steel cofferdam (17) is matched and fully contacted with the riverbed terrain. The lower end of the periphery of the steel cofferdam (17) with an open type double-wall structure has a basil (8) with a double-wall open type. The steel cofferdam improves sealing property and stiffness of the bottom of the steel cofferdam, the steel cofferdam can reduce the gap between the steel cofferdam and the riverbed as much as possible, does not need disassembly treatment such as blast and the like on irregular limestone at the bottom of the riverbed at the early stage, even can allow difficultly-cleared boulder stones on the riverbed, reduces the steel cofferdam project number and the work amount of bottom sealing concrete, is economic and practical, and ensures the realization of the construction period and the safety goal.

Description

technical field [0001] The invention mainly relates to a cofferdam used in the construction of bridge pier foundations on river beds, in particular to a special-shaped steel cofferdam used in the construction of bridge pier foundations in complex river bed terrains. Background technique [0002] Shaoguan Zhenjiang Bridge (center mileage DK179+951.508) is a key control project of the ZQ-3 bid of the newly-built Ganshao Railway Project. It is located in Shaoguan City, Guangdong Province and crosses the Zhenjiang River in Shaoguan City. The navigable level is VII, and the design navigable clear height 4.5m, side height 2.8m, navigable clear width 66m, upper bottom width 61m, highest navigable water level 57.88m, full bridge length 270.165m, span arrangement of (44+72+44)m prestressed concrete continuous beam and 3 -32m simply supported T-beam. The bridge has 5 piers and 2 bridges in total. Piers 1# to 4# are all located in the channel of the Zhenjiang River. They all use Φ1.5m...

AI Technical Summary

Problems solved by technology

[0003] For riverbeds with a large drop or a large difference in elevation between the two banks, the traditional method is to level the riverbed or adopt special-shaped steel cofferdams with high and low edge angles, but the high edge angle part is double-wall closed, and the low edge angle part is single-wall The high and low edge angles are adjusted by the height difference of the bottom joint cofferdam through a single-layer steel plate; the high edge angle part has a large contact area with the river bed, so the sealing is not good; the low edge angle part is due to its single layer Layer steel plate, which is not rigid enough for uneven and hard rock

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