A building structure comprising a plurality of the sandwich panels,
- wherein each of the sandwich panels comprise:
- a core having a hooking end and a groove end;
- and
- a first exterior panel and a second exterior panel disposed on one side and an opposite side of the core respectively, wherein each of the first and second exterior panels includes:
- a body in contact with the core,
- a hooking portion exhibiting elastic force toward a first direction perpendicular to a first surface of the body at a first end of the body, and
- a groove portion exhibiting elastic force toward a second direction perpendicular to the first surface of the body at a second end of the body and having an accommodating groove,
- wherein the hooking end includes a central protruding portion having a first cross-sectional area and step-down portions on both sides of the central protruding portion and the groove end includes an inflow protruding portion having a second cross-sectional area smaller than the first cross-sectional area and side protruding portions on both sides of the inflow protruding portion,
- wherein the accommodating groove is formed between the inflow protruding portion and the side protruding portions,
- wherein the side protruding portions protrude over the inflow protruding portion,
- wherein a height difference between the central protruding portion and the step-down portions is substantially equal to a height difference between the side protruding portions and the inflow protruding portion,
- wherein the hooking portion disposed at the hooking end of the core and the groove portion disposed at the groove end of the core,
- wherein an inflow groove is formed between the first exterior panel and the second exterior panel in front of the central protruding portion,
- wherein the hooking portion includes:
- a hooking member bent multiple times at the first end of the body and protruding toward a direction away from the body, and
- a hooking elastic member slantly bent with a curvature toward the body at the hooking member and is configured to be deformable by the transferred thermal energy,
- wherein the hooking elastic member includes:
- a hooking curvature portion connected to the hooking member and formed in a semicircular shape, and a hooking contact portion protruding toward the core at the hooking curvature portion,
- wherein an end of the hooking contact portion is spaced apart from the hooking member,
- wherein the groove portion includes:
- a groove member bent multiple times at the second end of the body to form the accommodating groove, and
- a groove elastic member slantly bent with a curvature toward the accommodating groove at the groove member and is configured to be deformable by the transferred thermal energy,
- wherein the groove elastic member includes:
- a groove curvature portion connected to the groove member and formed by bending toward the accommodating groove in a semicircular shape, and a groove contact portion protruding toward a circumferential direction of the accommodating groove at the groove curvature portion,
- wherein an end of the groove contact portion is spaced apart from a bottom of the accommodating groove,
- wherein the sandwich panels are arranged such that the inflow protruding portion of a first sandwich panel is inserted into the inflow groove of a second sandwich panel, wherein the hooking elastic member of the hooking portion is inserted into the accommodating groove so that the hooking contact portion of the hooking portion and the groove contact portion of the groove portion elastically contact each other, and
- wherein the hooking portion and the groove portion are configured to elastically contact each other more closely by deformation when thermal energy is applied, and the hooking portion and the groove portion comprise a material configured to be oxidized by the thermal energy so that oxygen between the first and second sandwich panels is reduced.