Abstract

The purpose of the present invention is to improve a problem which occurs during construction of a large-caliber cast-in-place concrete post installed in order to strengthen the bearing power of the ground on which a civil engineering structure is installed. The present invention relates to a cast-in-place concrete post using a geotube and a damage prevention device therefor, and a construction method therefor, which facilitate concrete placement and civil engineering structure construction by organically coupling a casing or a steel pipe casing, a geotube, and a damage prevention weight. The cast-in-place concrete post using a geotube and a damage prevention device therefor, according to the present invention, comprises: a steel pipe casing which is embedded in the ground at a predetermined depth and has a predetermined diameter and depth; a geotube which is embedded within the steel pipe casing at a predetermined depth in the lengthwise direction and has a predetermined diameter and length; a damage prevention device which has a damage prevention weight suspended on the inside of a predetermined part from the end of the geotube by means of a loop connected through a ring so as to prevent damage to the geotube; a rebar net which is embedded within the geotube at a predetermined depth in the lengthwise direction and has a predetermined size; and concrete which is placed in the rebar net and simultaneously is hardened. The construction method for a cast-in-place concrete post using a geotube and a damage prevention device therefor, according to the present invention, comprises: a step (I) of embedding a steel pipe casing (20), having a predetermined diameter and length, in the ground (10) at a predetermined depth using an excavator (30); a step (II) of excavating the ground (10) within the steel pipe casing (20) at a predetermined depth using a hammer grab (40) and a reverse circulation drill (RCD)/BG (50); a step (III) of producing a geotube (60) in accordance with the diameter and length of the steel pipe casing (20); a step (IV) of connecting a damage prevention device (110) to the lower end of the geotube (60) by adjusting the length of a loop in consideration of the depths of a weathered-rock layer and a soft-rock layer; a step (V) of inserting the geotube (60), to which the damage prevention device (110) is connected, into the steel pipe casing (20) in the lengthwise direction; a step (VI) of inserting a rebar net (70), having a predetermined size in the lengthwise direction, into the geotube (60) at a predetermined depth; and a step (VII) of installing a tremie pipe (80) in the middle of the rebar net (70), placing concrete (90) in the tremie pipe (80) and simultaneously drawing the tremie pipe (80) and the steel pipe casing (20) to the same height by interlocking the tremie pipe (80) and the steel pipe casing (20) from when the front end of the steel pipe casing is positioned 2m higher than the height of the front end of the tremie pipe (80).

IPC Classes  ?

• E02D 5/34 - Concrete or concrete-like piles cast in position
• E02D 5/40 - Concrete or concrete-like piles cast in position making by use of mould-pipes or other moulds in open water
• E02D 27/52 - Submerged foundations