The present invention relates to the field of construction of underground buildings, specifically to an inverse construction method for a deep, large and long pit assembling structure of a suspension-type envelope enclosure. A method includes design and calculation; engineering construction of foundation piles; control over underground water; construction of a pit enclosure; building of a basement reinforcing and anti-seeping layer; inverse construction; and floor structure construction. By the inverse construction method for a deep, large and long pit assembling structure of a suspension-type envelope enclosure of the present invention, the pit construction quality is easily controlled, the basement is well waterproofed and easily monitored, and the quality control, service and maintenance are easy.

Disclosed is a comprehensive excavation process performed on an excavation site. The process includes installing wellpoints for lowering the groundwater level within the excavation site and stabilizing the boundary soil walls of the excavation site by an improved soil nailing method. The improved soil nailing method employs casing pipes that are part of the wellpoint system as reinforcing elements for the stabilization of the soil walls.

Disclosed is a comprehensive excavation process performed on an excavation site. The process includes installing wellpoints for lowering the groundwater level within the excavation site and stabilizing the boundary soil walls of the excavation site by an improved soil nailing method. The improved soil nailing method employs casing pipes that are part of the wellpoint system as reinforcing elements for the stabilization of the soil walls.

The present invention relates to the field of construction of underground buildings, specifically to an inverse construction method for a deep, large and long pit assembling structure of a suspension-type envelope enclosure. A method includes design and calculation; engineering construction of foundation piles; control over underground water; construction of a pit enclosure; building of a basement reinforcing and anti-seeping layer; inverse construction; and floor structure construction. By the inverse construction method for a deep, large and long pit assembling structure of a suspension-type envelope enclosure of the present invention, the pit construction quality is easily controlled, the basement is well waterproofed and easily monitored, and the quality control, service and maintenance are easy.

A drainage system for engaging and removing accumulating drainage water with a sump pump liner, a sump pump disposed within the liner, and at least one contiguous void with an inner volume in fluidic communication with an inner volume of the liner. The void can comprise a low pressure void compartment disposed distal to the bottom of the liner, or the void can comprise a water harvesting arm with a proximal end retained by the main body of the liner and a body portion that projects from the main body. Liner-void apertures can be disposed in the bottom of the main body of the liner, and void-environment apertures can be disposed in a void bottom partition. The main body can have a rectangular cross section with a lateral water harvesting arm projecting from each sidewall.

A dewatering system for excavation sites that have a depth of greater than seventy feet. The dewatering system of the present invention includes a first dewatering pump wherein the first dewatering pump is placed in a depression below ground level at the bottom of an excavation site. The first dewatering pump has an outlet hose operably coupled thereto wherein the outlet hose is operably coupled to an inline adapter module at the opposing end of the outlet hose from the first dewatering pump. The inline adapter module includes a connection element wherein the connection element is configured to be operably coupled to the outlet hose. The connection element is operably coupled to a pump member of the inline adapter utilizing an adapter member. The pump member of the inline adapter module provides additional pumping capacity to the dewatering system. A collection member is operably coupled to the inline adapter module.