The present invention is provided to shorten a period of underground frame construction in top-down construction method, and more specifically, provides a construction method for alternately constructing underground vertical members downward to lower levels and then constructing remaining vertical members during the same time period after mat and foundation construction, thus making it possible to shorten a construction period of the vertical members and an overall construction period. The method includes a first step of installing the earth retaining wall, constructing the underground pillar post, excavating the first underground level, and constructing the first above-ground level floor; a second step of first constructing the core part of one underground level while constructing the underground level slab downward to support the above-ground level core part which is constructed upward; a third step of alternately constructing an underground vertical member downward; and a step of constructing remaining underground vertical members during the same time period after the construction of the lowest level mat or the foundation, in which the construction period of the underground vertical member is shortened, and thereby the above-ground frame and finishing construction can be started early and an overall construction period is shortened.

The present invention is provided to shorten a period of underground frame construction in top-down construction method, and more specifically, provides a construction method for alternately constructing underground vertical members downward to lower levels and then constructing remaining vertical members during the same time period after mat and foundation construction, thus making it possible to shorten a construction period of the vertical members and an overall construction period. The method includes a first step of installing the earth retaining wall, constructing the underground pillar post, excavating the first underground level, and constructing the first above-ground level floor; a second step of first constructing the core part of one underground level while constructing the underground level slab downward to support the above-ground level core part which is constructed upward; a third step of alternately constructing an underground vertical member downward; and a step of constructing remaining underground vertical members during the same time period after the construction of the lowest level mat or the foundation, in which the construction period of the underground vertical member is shortened, and thereby the above-ground frame and finishing construction can be started early and an overall construction period is shortened.

The present invention relates to a method for constructing a structure, the method comprising constructing an underground structure on the ground, and then constructing the structure in the ground by sinking same into the ground.

The present invention relates to a method for constructing a structure, the method comprising constructing an underground structure on the ground, and then constructing the structure in the ground by sinking same into the ground.

Disclosed is a cover for a utility vault and a method for making such covers. The cover is formed from fiberglass reinforcement layers and a polymer mix matrix. The reinforcement layers include a bottom reinforcement layer, one or more edge reinforcement layers, and a top reinforcement layer. A first portion of the edge reinforcement layer overlaps a portion of the bottom reinforcement layer and a second portion of the edge reinforcement layer overlaps a portion of the top reinforcement layer. The reinforcement layers are formed from fiberglass fabric and may include fiberglass layers whose fibers are oriented quadraxially. The polymer mix impregnates the fabric layers and forms the bulk of the cover. The polymer matrix bonds the reinforcement layers so that forces applied across the top and bottom layers are communicated to the edge reinforcement layer. The polymer matrix includes a thermoset polymer resin and an expanded glass bead filler.

Disclosed is a cover for a utility vault and a method for making such covers. The cover is formed from fiberglass reinforcement layers and a polymer mix matrix. The reinforcement layers include a bottom reinforcement layer, one or more edge reinforcement layers, and a top reinforcement layer. A first portion of the edge reinforcement layer overlaps a portion of the bottom reinforcement layer and a second portion of the edge reinforcement layer overlaps a portion of the top reinforcement layer. The reinforcement layers are formed from fiberglass fabric and may include fiberglass layers whose fibers are oriented quadraxially. The polymer mix impregnates the fabric layers and forms the bulk of the cover. The polymer matrix bonds the reinforcement layers so that forces applied across the top and bottom layers are communicated to the edge reinforcement layer. The polymer matrix includes a thermoset polymer resin and an expanded glass bead filler.

A cover for a utility vault and a method for making such covers. The cover is formed from fiberglass reinforcement layers and a polymer mix matrix. The reinforcement layers include a bottom reinforcement layer, one or more edge reinforcement layers, and a top reinforcement layer. A first portion of the edge reinforcement layer overlaps a portion of the bottom reinforcement layer and a second portion of the edge reinforcement layer overlaps a portion of the top reinforcement layer. The reinforcement layers are formed from fiberglass fabric and may include fiberglass layers whose fibers are oriented quadraxially. The polymer mix impregnates the fabric layers and forms the bulk of the cover. The polymer matrix bonds the reinforcement layers so that forces applied across the top and bottom layers are communicated to the edge reinforcement layer. The polymer matrix includes a thermoset polymer resin and an expanded glass bead filler.

A cover for a utility vault and a method for making such covers. The cover is formed from fiberglass reinforcement layers and a polymer mix matrix. The reinforcement layers include a bottom reinforcement layer, one or more edge reinforcement layers, and a top reinforcement layer. A first portion of the edge reinforcement layer overlaps a portion of the bottom reinforcement layer and a second portion of the edge reinforcement layer overlaps a portion of the top reinforcement layer. The reinforcement layers are formed from fiberglass fabric and may include fiberglass layers whose fibers are oriented quadraxially. The polymer mix impregnates the fabric layers and forms the bulk of the cover. The polymer matrix bonds the reinforcement layers so that forces applied across the top and bottom layers are communicated to the edge reinforcement layer. The polymer matrix includes a thermoset polymer resin and an expanded glass bead filler.

Described herein are apparatus, systems and methods useful in forming vertical structures.

Described herein are apparatus, systems and methods useful in forming vertical structures.