PILE HEAD REINFORCING STRUCTURE USING EXCAVATION BIT, WHICH ENABLES MULTI-STAGE REAMING AND TO WHICH NON-WELDED CASING COUPLER IS APPLIED, AND PILE CONSTRUCTION METHOD USING SAME
The present invention relates to a pile head reinforcing structure using an excavation bit, which enables multi-stage reaming and to which a non-welded casing coupler is applied, and a pile construction method using the same, the structure and the method: mounting a non-welded casing coupler to the excavation bit, which enables multi-stage reaming, so as to perform boring and insert a casing at the same time, thereby promoting the simplicity and rapidity of construction; enabling the plurality of casings to be connected or separated by means of the coupler, thereby resolving problems caused by the welding and cutting of the casings during construction; and coupling a head reinforcement to the upper part of a pile without welding and burying the same in concrete of a foundation part so as to disperse a pullout load and a vertical load and relieve stress concentration, thereby enabling the stable foundation part for supporting an upper structure to be formed.
The present invention relates to an excavation bit capable of facilitating the installation of a steel pipe, and to an excavation steel pipe. The excavation bit comprises: a bit body formed elongated in the longitudinal direction so as to be insertable into the excavation steel pipe having a pipe shape; a bit head part coupled to one surface of the bit body, and having an excavation surface formed on a tip of the bit head part and a wing bit accommodating groove formed on an outer circumferential surface of the bit head part; a wing bit formed elongated in the longitudinal direction and installed near the excavation surface of the bit head part such that the wing bit can be folded and unfolded; and a temporary catching device protruding from the bit body in the outer diameter direction and installed so as to catch onto a catching projection portion of the excavation steel pipe so that the excavation steel pipe progresses together with the bit body in the direction of progress of excavation while being inserted by the bit body, and only the bit body emerges externally while leaving the excavation steel pipe behind when the bit body moves backward in the direction opposite to the direction of progress of excavation.
E21B 10/32 - Drill bits with leading portion, i.e. drill bits with a pilot cutterDrill bits for enlarging the borehole, e.g. reamers with expansible cutting tools
E21B 10/42 - Rotary drag type drill bits with teeth, blades or like cutting elements, e.g. fork-type bits, fish tail bits
E21B 10/62 - Drill bits characterised by parts, e.g. cutting elements, which are detachable or adjustable
E02D 5/38 - Concrete or concrete-like piles cast in position making by use of mould-pipes or other moulds
E02D 7/30 - Placing of hollow piles or mould-pipes by means arranged inside the piles or pipes by driving cores
The present invention relates to an excavation bit, and the excavation bit may comprise: a bit head part that has a pointed end excavation surface formed thereon, a plurality of stopper accommodating grooves having equal angles disposed on an outer circumference surface thereof, and a sliding shaft part formed in a rear end thereof; a wing bit that has a body that is formed long in a length direction, and shaft protrusions formed in both side surfaces thereof, wherein the shaft protrusions are inserted along guide grooves formed in the stopper accommodation grooves of the bit head part and installed to be foldable/unfoldable in the vicinity of the pointed end excavation surface of the bit head part; and an outer shell member that has a first stopper installed on one side thereof, being inserted deep into the stopper accommodation grooves and contacting the wing bit so that the wing bit can protrude outwardly from the bit head part while maintaining an unfolded state, and having a first length, and a second stopper installed on another side thereof, being inserted shallowly into the stopper accommodation grooves so as to form a space for the folded wing bit, and having a second length that is shorter than the first length.
E21B 10/26 - Drill bits with leading portion, i.e. drill bits with a pilot cutterDrill bits for enlarging the borehole, e.g. reamers
E21B 10/32 - Drill bits with leading portion, i.e. drill bits with a pilot cutterDrill bits for enlarging the borehole, e.g. reamers with expansible cutting tools
E21B 10/627 - Drill bits characterised by parts, e.g. cutting elements, which are detachable or adjustable with plural detachable cutting elements
E21B 7/28 - Enlarging drilled holes, e.g. by counterboring
E02D 3/12 - Consolidating by placing solidifying or pore-filling substances in the soil
4.
DUAL COMPUTER SECURITY SYSTEM AND METHOD USING NON-CONTACT CARD
A dual computer security system according to the present application comprises: a non-contact type master card for storing card identification information; and a switch control apparatus comprising a memory part for storing card identification information of the master card, a card reader part for receiving the card identification information transmitted from the master card, a first computer power control part for controlling the power supply of a first computer, a second computer power control part for controlling the power supply of a second computer, and a control part for controlling the power and activation switch of the first computer and the second computer if the card identification information received through the card reader part matches the card identification information stored in the memory part.
The present invention relates to a ground excavation hammer bit system, and to a pile driving method using same, which includes a guide device inserted into a casing pipe so as to excavate the ground, a bit housing fastened to the guide device, wing bits fastened in a rotatable manner to bit grooves on both sides of the bit housing, and a casing shoe inserted inward from the end of the casing pipe. According to the excavation hammer bit system of the above described configuration, the wing bits are respectively fastened by pins to the bit grooves formed on both sides of the body of the bit housing so that the wing bits can be rotated about the pins, and the bit housing, which is fastened in such a manner that the wing bits can be rotated, is rotated in order to accomplish excavation and digging.
E21B 10/32 - Drill bits with leading portion, i.e. drill bits with a pilot cutterDrill bits for enlarging the borehole, e.g. reamers with expansible cutting tools
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