Two-way pre-stress system and bending device therefor
Disclosed is a two-way pre-stress system for applying pre-stress to a member of a structure by a pre-tendon method, the system comprising: a mold for forming the member, the mold having a concrete pouring space; a supporter installed outside the mold; at least one horizontal tendon installed in the mold in a horizontal direction; a horizontal tendon settling device installed at the supporter, for settling the horizontal tendon in the mold; at least one vertical tendon installed in the mold in a vertical direction; a vertical tendon settling device installed at the supporter, for settling the vertical tendons in the mold; and a bending device installed at the supporter and combined with at least one of the vertical tendon, for forming a bent portion in at least one vertical tendon in a deep portion of the member.
1. A two-way pre-stress system for applying pre-stress to a member of a structure by a pre-tendon method, the system comprising:
a mold for forming the member, the mold having a concrete pouring space;
a supporter installed outside the mold;
at least one horizontal tendon installed in the mold in a horizontal direction;
a horizontal tendon settling device installed at the supporter, for settling the horizontal tendon in the mold;
at least one vertical tendon installed in the mold in a vertical direction;
a vertical tendon settling device installed at the supporter, for settling the vertical tendon in the mold; and
a bending device installed at the supporter and combined with at least one vertical tendon of the at least one vertical tendon, for forming a bent portion in at least one vertical tendon in a deep portion of the member;
wherein the bending device comprises:
a base portion installed at the supporter;
a body portion installed at the base portion and positioned between the supporter and the mold;
a tendon supporting portion installed in the body portion, the tendon supporting portion penetrating a through-hole in a bottom surface of the mold, and supporting the vertical tendon, for bending the vertical tendon; and
a detachable supplementary supporting member installed between the body portion and the tendon supporting portion which limits a rotation of the body portion in a horizontal direction;
wherein the body portion is coupled with the base portion by a hinge unit for horizontal rotation so that the body portion may be rotated in a horizontal direction with respect to the base portion.
2. The system of claim 1 , wherein the at least one vertical tendon comprises:
a linear vertical tendon linearly installed; and
a bent vertical tendon having a bent portion formed by the bending device.
3. The system of claim 2 , wherein the at least one horizontal tendon is settled at an upper portion of the mold, and the linear vertical tendon is settled at a lower portion of the mold.
4. The system of claim 3 , wherein a central portion of the bent vertical tendon is settled at a lower portion of the mold, and both end portions of the bent vertical tendon are upwardly inclined towards both end portions of the mold in a vertical direction.
5. The system of claim 1 , wherein the bending device is installed to penetrate a through-hole in a bottom surface of the mold.
6. The system of claim 1 , further comprising an operating space for assembling or disassembling the mold between the supporter and the mold.