Construction method of underground structure that enables continuous retaining wall using steel wale and diaphragm effect of concrete slab

The present invention is constructed up to the base portion by a downward construction in which by using a permanent beam members, and gangmak action of the line casting a concrete slab (Diaphragm Effect) for supporting a buried iron wale and steel wale supporting the lateral earth pressures that occur during the construction state after upward construction during the casting integrally with the rudder method in order to ground the outer wall, as well as be effectively built an underground structure let the water leakage that may occur as the casting remove the underground external wall also buried steel wale and slab gangmak action to prevent It relates to an underground structure construction method which enables an underground continuous outer wall construction using. The main contents of the method provided by the present invention is the earth pressure of the steel pedestal, beam members are designed to support the dead load and construction loading of permanent beam members, steel-wale and after the concrete floor for supporting steel wale and this is embedded in the basement outer wall economical design to the axial load by effectively combining respective structural role basement line casting a concrete slab to pass a gangmak action of the slab, by performing the design of the lateral soil pressure support in the downward construction, the permanent beam member to resist lateral earth pressure as well as make it possible, by making the down during construction slab of concrete to a state in which to remove the slab of an underground curtain wall in the cast-in-place only up to the sidelines hypothesis earth retaining walls and the structure to resist the lateral soil pressure, later after the base casting of the basement walls during upward construction integral construction, air, Ltd. (sunta construction), compared to the conventional method so as to enable the As well as the increase in the construction management effectiveness and the construction method of the underground structure so as to drastically reduce the defect, such as a later leakage.