Abrégé

The present invention provides a device and a method for constructing an underground structure, which can improve workability and shorten working hours. The invention comprises: a retaining wall which is formed on a circumferential face of an excavated part that is dug out to install an underground structure; a plurality of center piles which are embedded in said excavated part in a removable manner; a first-stage horizontal structure which is installed on an upper end of said center piles such that the first-stage horizontal structure is supported on said center piles; each-floor horizontal structures which are installed to form floors up to a bottom surface of said excavated part in a direction towards a lower end of said first-stage horizontal structure, to support said retaining wall; a constructive connection member which has one side that is connected to the neighboring first-stage horizontal structure on the upper end or to said each-floor horizontal structures, and has the other side that is connected to said neighboring each-floor horizontal structures on the lower end, so as to sequentially connect and install said each-floor horizontal structures from said first-stage horizontal structure, wherein the length of the constructive connection member is adjustable; and brackets which are mounted on said center piles in order to support the each-floor horizontal structures that are connected to the other side of said constructive connection member. Thus, since said brackets are installed in a state where the horizontality of said each-floor horizontal structures is adjusted by adjusting the length of said constructive connection member, the invention can fix said each-floor horizontal structures.

Classes IPC  ?

• E02D 29/045 - Ouvrages souterrains, p.ex. tunnels ou galeries, creusés à ciel ouvert ou par des procédés impliquant une perturbation de la surface du sol tout le long du tracé; Leurs procédés de construction
• E21D 9/04 - Creusement de galeries en terrain de faible consistance; Dispositifs à cet effet non prévus ailleurs

Abrégé

The present invention provides an open-close type ratchet wrench including: a head having a hollow portion with one open side; a ratchet wheel having an interior with a mounting portion which has one open side to enable a bolt head or a nut to be laterally inserted into or extracted from the mounting portion and to cover a part of the side surface of the bolt head or the nut, wherein the ratchet wheel has an outer wall coupled to the inner wall of the hollow portion such that the ratchet wheel is rotatable about the rotating axis of the bolt head or the nut inserted in the mounting portion; and a first open-close bar coupled to the ratchet wheel to open or close the one open side of the mounting portion. As one side of the ratchet wrench of the present invention is openable to enable a bolt nut or a nut to be laterally inserted into the ratchet wrench, the mounting of the bolt head or the nut is made dramatically easier. Further, the ratchet wheel covers the entire outer surface of the bolt head or the nut when one side of the ratchet wrench is closed to close the space where the bolt head or the nut is mounted, thereby applying a torque in a stable manner.

Classes IPC  ?

• B25B 13/22 - Dispositions pour le verrouillage des mâchoires par action d'un cliquet ou d'une barre dentée

Abrégé

The present invention relates to a drop-panel structure. The present invention provides a grid-type drop panel structure characterised in that it comprises: a plurality of pillars (100, 101) or wall bodies; and a linking member (210) comprising a drop panel (219) formed from concrete in such a way as to have a horizontal cross-section which is wider than the horizontal cross-section of the pillars (100, 101) or wall bodies; and in that the linking member (210) is formed in the shape of a grid in which four unit rods (212) surround the circumference of the drop panel (219), and the unit rods (212) are parallel to the surfaces of the pillars and are constituted so as to intersect each other at the same height. The present invention has the advantageous effect that a drop panel is produced and the buckling length due to sagging of the slab is reduced.

Classes IPC  ?

• E04B 5/43 - Structures de planchers de conception particulière; Caractéristiques relatives à la stabilité élastique; Structures de planchers spécialement conçus pour reposer uniquement sur des colonnes, p.ex. planchers-champignons

Abrégé

The present invention relates to a PHC pile used in a permanent retaining wall structure, and a connection method thereof, and more particularly, to a method of connecting PHC piles to each other by inserting a connection bar into connection pipes embedded in sheaths of the PHC piles. To this end, the PHC pile comprises a left connection pipe installed at one side of the sheath of the PHC pile and a right connection pipe embedded at the other opposite side of the sheath. Further, the method of connecting the PHC pile to each other comprises the steps of inserting a water-proof material into inner semi-cylindrical grooves of the connection pipes, inserting the connection bar between the connection pipes of the PHC piles, and consecutively connecting a plurality of PHC piles to one another by repeating the above steps.

Classes IPC  ?

• E02D 5/02 - Palplanches ou rideaux de palplanches

Abrégé

A method of forming multiple horizontal structural members is disclosed. The method includes building a vertical structural member by a sliding construction method, lifting a horizontal form frame unit using sliding construction equipment, installing a frame support structure under the horizontal form frame unit, casting concrete into the horizontal form frame unit to form a horizontal structural member, and simultaneously building the horizontal structural members to several stories.

Classes IPC  ?

• E04G 3/28 - Echafaudages essentiellement supportés par le bâtiment, p.ex. réglables en hauteur Échafaudages avec plates-formes mobiles

Abrégé

A steel bar connecting structure is disclosed. The steel bar connecting structure includes a connecting sleeve having on an inner circumference thereof an internal threaded part, and a steel bar having an external threaded part which engages with the internal threaded part. The steel bar is inserted into the connecting sleeve. Each of the internal threaded part and the external threaded part is formed such that a crest of each of threads thereof is cut. Thereby, when the steel bar is strongly coupled to the connecting sleeve, a neighboring crest and root of the internal threaded part and the external threaded part are not in contact with each other, whereas inclined flanks of the threads of the internal threaded part and the external threaded part are in close contact with each other.

Classes IPC  ?

• F16B 7/18 - Assemblages de barres ou assemblages de tubes, p.ex. de section non circulaire, y compris les assemblages élastiques utilisant des éléments filetés

Abrégé

An underground earth retention strut construction method using a horizontal frame structure is disclosed, in which since a vertical member is formed after a horizontal frame structure is first installed and completed, it is possible to minimize any interference between the vertical member and the horizontal frame structure for thereby achieving an easier construction and enhancing a construction quality. The interval of the temporary vertical member is widened during an underground excavation work, so that the ground excavation work is easy. The improved horizontal frame structure of an architecture comprises a pair of straight members which are connected by at least one plate; and a “#”-shaped connection member which is connected at a portion in which the straight members cross with each other.

Classes IPC  ?

• E04B 1/24 - Structures comportant des éléments porteurs allongés, p.ex. colonnes, poutres, ossatures les pièces porteuses étant métalliques

Abrégé

The present invention relates to a reinforcement of foundation which comprises at least two base steel plates arranged to be upright with respect to the ground and shaped as a plate with a cutaway formed at a top portion thereof, a reinforced steel plate coupled to upper portions of both ends of the base steel plates, fastening steel rods placed to extend in a longitudinal direction of the base steel plate and coupled to the reinforced steel plate, and a connection steel rod bored sequentially through the base steel plates and coupled to the base steel plates. According to the present invention, huge concentrated load exerted on a foundation can be uniformly distributed, and thus, load transmitted from a pillar or column installed on the foundation can be stably supported. Further, the thickness of foundation can also be reduced as compared with the prior art, and thus, the excavation can be made shallow. Accordingly, the period and expense of construction can be reduced.

Classes IPC  ?

• E02D 27/08 - Armatures pour fondations à plat