LPV-3.2 West Refort Floodwall是美国陆军工程兵团140亿美元的任务的关键，以建立大新奥尔良飓风和降低风险危害风险系统。Odebrecht-Johnson Bros.的合资企业领导了这项耗资9400万美元的项目。

位于密西西比河东岸in Jefferson Parish, the West Return Floodwall runs along the St. Charles and Jefferson Parish line from Louis Armstrong New Orleans International Airport to Lake Pontchartrain. The project constructed a three-mile-long concrete T-wall on the Jefferson Parish lake front.

Traveling north to south along the Jefferson Parish line, the T- wall reduces flooding risks for residences and businesses from a storm surge in Lake Pontchartrain and the LaBranche wetlands as part of a 100-year storm. The majority of the materials and equipment were transported to the site via barges along Lake Pontchartrain and the Mississippi River.

工作包括清理和抓地，驾驶H-Piles和板块堆，挖掘，建筑路堤，拆除旧的洪水墙和建造新的洪水，修改泵站放电管，铺设沥青路面，建立草皮并进行维护。

洪水墙需要453,900平方英尺的薄板堆，54,000立方英尺的混凝土，126,000立方米的挖掘和路堤以及3,600吨加固。

挑战之一是在堤坝和洪水墙的基础上与贫穷的土壤合作。可渗透的沙子，现有的泥炭和弱土壤条件以下60英尺，导致卡特里娜飓风期间堤防失败。

洪水墙的建设完全在水上进行。为了维持时间表，团队使用螺栓张力连接器代替了焊接的专门板衬里设备，并利用了9吨至300吨的起重机。

使用了五十条驳船，全部包含在100英尺宽乘6英尺深的运河中。该站点包括将近两英里的临时工作台和200多名机组人员。

One of the biggest design challenges was to maintain existing flood protection from the original wall during construction of the new floodwall. It was built only 20 ft to 30 ft away from the face of the existing wall. Designers had to carefully weave the H-piles for the new floodwall between reinforced concrete piles that were stabilizing the existing floodwall.

原始合同要求洪水墙的一部分被完全拆除，并用临时保留结构代替。但是，为此，Odebrecht-Johnson Bros.能够设计一个布局，该布局将在建造过程中将现有墙留在适当的位置，从而大大降低了城市的风险并为所有者创造了可观的节省。

The project team also had to be prepared during hurricane season to close, on short notice, four breaches in the existing wall used for construction access. The construction team designed a temporary gate that could be closed within minutes if necessary.

西部回报洪水墙按预算按时交付，几乎没有干扰社区。

Key Players

所有者美国陆军工程兵团, Harahan, La.

总承包人Odebrecht-Johnson Bros.，新奥尔良合资企业

线索设计美国陆军工程兵团, New Orleans

结构/民用/MEP美国陆军工程兵团