Construction method of double-wall deformed steel cofferdam lowering

Abstract

The invention relates to a construction method of double-wall deformed steel cofferdam lowering, and belongs to the technical field of steel cofferdam construction. The invention provides the construction method applied to large-scale double-wall deformed steel cofferdam lowering under the complex hydrologic conditions, the construction technology of pier-after-weir is adopted, meanwhile a double-wall deformed steel cofferdam structure is adopted, a deformed structure is adopted to be matched with the bottom elevation of a steel cofferdam according to the bottom landform of a riverbed, supportcorbels are fixedly arranged on the outer side wall of support piers, the support corbels serve as a first section steel cofferdam assembling platform, a diamond hanger system is adopted to be matched with a jack to lower in the steel cofferdam, the lowering requirements of the large-scale steel cofferdam under the complex hydrologic conditions can be met, and the safe factor of the system is greatly increased; and meanwhile a location system is arranged to guarantee the accurate lowering of the steel cofferdam. The construction method of double-wall deformed steel cofferdam lowering has theadvantages that the project progress is improved, the operation is easy, the cost is saved, and safety is high, and meanwhile novel technologies of steel cofferdam construction is enriched.

Description

technical field [0001] The invention relates to a construction method for lowering a double-wall special-shaped steel cofferdam, and belongs to the technical field of steel cofferdam construction. Background technique [0002] In the field of infrastructure construction such as buildings and bridges, steel cofferdams, as a temporary maintenance structure, play an important role in preventing water and soil from entering the interior of the cofferdam and excavating foundation pits. The steel structure has many advantages, which promote the wider application of the steel box cofferdam. The commonly used steel cofferdams usually include single-wall steel cofferdams and double-wall steel cofferdams. Under complex hydrological conditions, the structural rigidity and safety of single-wall steel cofferdams are difficult to guarantee, so double-wall steel cofferdams have been more widely used in large bridge construction. At the same time, under complex hydrological conditions, the...

AI Technical Summary

Problems solved by technology

The advantage of this solution is that the processing efficiency is high, and the damage to the steel cofferdam wall can be avoided by cutting. Under the environment, the horizontal load is reduced, and the safety is difficult to guarantee

Patent Publication No. CN107761751A discloses "A Double-walled Steel Cofferdam and Its Construction Method". By setting pulling lugs on the outer wall, the cables exert tension on the double-walled steel cofferdam from multiple points to limit the steel cofferdam. The movement of the weir after launching improves the construction accuracy of the steel cofferdam; however, this method of positioning using a hoist increases the number of operating steps in the lowering process, occupies limited operating space, and increases the overall cost of construction

Patent Publication No. CN107237338A discloses "Double-wall steel cofferdam block-by-block construction method". First, the construction of the island cofferdam is carried out, and then the cofferdam foundation pit is cut out, and then the base is leveled and the steel cofferdam is hoisted; the method passes The steel cofferdam with a special structure of male and female locks is used for construction to ensure the tightness and accuracy of the connection, but this method is not suitable for the construction method of piles first and then the cofferdam, especially the impact of water flow cannot be considered

Patent Publication No. CN107288140A discloses "Construction Device and Construction Method for Active Sinking and Correction of Steel Cofferdam", which forces the steel cofferdam to actively sink by tightening the tie rods to increase the pressure, reduces the amount of mud suction, and speeds up the construction period. However, this method It is not suitable for large-scale cofferdams, because more tie rods need to be added and more jacks must be installed at the same time, which is difficult to implement in terms of increased cost and lifting effect

Images