Drainage Construction Method for Construction of U-shaped Bay Bridge in Narrow Estuary

Abstract

The invention discloses a water draining method for a narrow estuary U-shaped bay bridge construction. The method comprises the following steps: (1) a dam is filled in an estuary of an U-shaped bay; (2) firstly, the riprap construction is adopted to perform the doundation treatment; and then, soils and stones are used for filling, and are compacted to form the dam; (3) a gate is mounted on the dam; the bottom height of the gate is lower than the lowest water level of seawater on daily; the gate is closed at high tide in every day, and is opened at ebb tide; the inner water level of an internal lake is exhausted lower by using the tidal action to form a low-water level internal lake; when the water level is lowered to the ebb tide water level, the gate is closed; a construction working surface is built in the internal lake; and a bridge is built on the construction working surface; and (4) after the project construction of the internal lake is finished, the gate is opened at high tide, and the seawater outside the dam is guided in to increase the water surface height of the internal lake; and when the water surface height of the internal lake is close to the external water surface height, the gate, the dam and piles are disassembled. The method reduces the filling earth volume or the material utilization amount of steel pipe piles.

Description

technical field [0001] The invention relates to the field of municipal engineering construction, in particular to a construction method for bridge construction in U-shaped bay areas of narrow estuaries. Background technique [0002] The currently known drainage construction methods for the construction of narrow U-shaped bay bridges at sea estuaries mainly adopt sea reclamation construction or the construction mode of erecting steel trestle bridges. However, because the waters of the bay area are connected to the sea, they have many characteristics such as large water area, water depth, large water volume, strong wave influence and tidal influence, etc., which make the reclamation work not only slow but also costly. Often due to environmental requirements and waterway requirements, the filling soil needs to be excavated after the reclamation construction is completed, which delays the construction period and increases the cost. The construction method of the steel trestle b...

AI Technical Summary

Problems solved by technology

However, because the waters in the bay area are connected to seawater, they have many characteristics such as large water area, water depth, large water volume, strong wave influence and tidal influence, etc., which makes the reclamation work not only slow but also costly.

Often due to environmental requirements and waterway requirements, the filling soil needs to be excavated after the reclamation construction is completed, which delays the construction period and increases the cost

However, the steel trestle construction method is expensive because of the large amount of steel used, and the steel is severely eroded by seawater due to long-term immersion, so it is not suitable for long-term and large-area bay construction.

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