KR-102961827-B1 - Double T slab with a middle wing panel that allows continuous joints

KR102961827B1KR 102961827 B1KR102961827 B1KR 102961827B1KR-102961827-B1

Abstract

The present invention relates to a double-T slab in which a middle wing panel is formed to enable continuous joints. More specifically, in configuring the connection between the double-T slab and a beam supporting the double-T slab, a middle wing panel is formed at the end of the double-T slab to form a reliable compression support capable of implementing a moment connection in the overall structural behavior of the double-T slab. By inducing a negative moment through this, the invention ensures economic efficiency through the efficient utilization of the cross-section of the double-T slab and prevents cracking at the interface. A preferred embodiment of the present invention comprises: a plate-shaped upper plate; a truss girder configured such that the lower portion is embedded with a widthwise spacing from the longitudinal end of the upper plate to a certain section in the longitudinal direction; a rib formed parallel to the lower portion of the upper plate, protruding from the lower portion of the upper plate at a certain distance in the widthwise direction of the upper plate; and a middle wing panel formed in a plate shape having the same width as the upper plate at a certain position in the heightwise direction of the rib from the longitudinal end of the upper plate to a certain section in the inner direction.

Inventors

김형근
이동우

Assignees

(주)더픽알앤디
(주)아이스트

Dates

Publication Date: 20260508
Application Date: 20240902

Claims (7)

Plate-shaped upper plate (10); A truss girder (40) configured such that the lower portion is embedded with a widthwise spacing from the longitudinal end of the upper plate (10) to a certain section in the longitudinal inner direction; A rib (20) formed parallel to the lower surface of the upper plate (10) and protruding downward from the upper plate (10) at a certain distance in the width direction of the upper plate (10); It includes a middle wing panel (30) formed in a plate shape having the same width as the upper plate (10) at a certain position in the height direction of the rib (20) from the longitudinal end of the upper plate (10) to a certain section on the inner side. A double T-slab in which a middle wing panel is formed, characterized in that adjacent truss girders (40) separated by a beam (2) are connected to each other through a negative moment upper reinforcement (50).
In claim 1, A double T-slab capable of continuous joints formed by forming a middle wing panel characterized by reinforcing bars (310) being arranged inside the middle wing panel (30).
In claim 2, A double T-slab capable of continuous joints formed by a middle wing panel characterized by reinforcing bars (310) being composed of horizontal members (311) arranged in parallel and truss members (312) arranged between the horizontal members (311).
In claim 1, A double T-slab in which a truss girder (40) is formed, and a middle wing panel is formed in the section (L) in which the upper surface of the upper plate (10) protrudes further upward to increase the thickness, thereby enabling continuous joints.
In claim 1, A double T-slab in which a middle wing panel is formed, characterized in that the section where the truss girder (40) is formed is positioned at a certain height below the upper plate (10) with a step difference.
In claim 1, A double T-slab capable of continuous joints formed by a middle wing panel, characterized in that the middle wing panel is formed by being formed by extending a certain distance from the outer end of the upper plate (10) to the inner end, and an inclined panel (50) is integrally formed to connect the outer end of the upper plate (10) to the inner end of the middle wing panel (30) at an angle.
In claim 6, A double T-slab capable of continuous joints, wherein a middle wing panel is formed and a lightweight body (5) is configured in the space (S) formed by the rib (20), middle wing panel (30), and inclined panel (50) at the top of the middle wing panel (30).

Description

Double T slab with a middle wing panel that allows continuous joints The present invention relates to a double-T slab in which a middle wing panel is formed to enable continuous joints. More specifically, in configuring the connection between the double-T slab and a beam supporting the double-T slab, a middle wing panel is formed at the end of the double-T slab to form a reliable compression support capable of implementing a moment connection in the overall structural behavior of the double-T slab. By inducing a negative moment through this, the invention ensures economic efficiency through the efficient utilization of the cross-section of the double-T slab and prevents cracking at the interface. Generally, double T-type PC slabs are widely used today because they offer advantages such as quality control, fire resistance, durability, and reduced construction time due to being produced in advance using precast concrete in a factory; they are also known as one of the most efficient cross-sections among unidirectional slab systems. In the case of such a double T-shaped PC slab, the condition for continuity at the connection requires the formation of strong compression supports to induce moments, and the securing of integrity to resist large negative moments at the upper end of the connection. However, existing double T-type PC slabs did not meet these conditions, so the joints between slabs could not be integrated. Consequently, there was a problem in that the tensile strength and load-bearing capacity were reduced, leading to cracking and causing sagging of adjacent slabs. The technology forming the background of the present invention is Patent Registration No. 1142183, "Structure for reinforcing the integrity of a beam-slab joint in a double-T slab system and method of construction thereof" (Patent Document 1). In the background technology described above, in the connection between the beam (PC beam) and the slab in a double-T slab system, there is a PC beam (110) having a square cross-section with reinforcing bars arranged on the upper surface, with both ends respectively resting on the upper surface of each installed column (150); and a double-T slab (120) having a pair of reinforcing ribs (123) formed downwardly protruding from the lower surface, with each having a cut-out resting surface (122) formed on the front and rear surfaces respectively so as to be resting on the upper surface of the PC beam (110); A structure that strengthens the integrity of the beam-slab joint in a double-T slab system is proposed, characterized by comprising: a cover means (130) each installed at the front and rear ends between the reinforcing ribs (123) of the double-T slab (120) to prevent leakage of the cast-in-place topping concrete (140) that is cast to integrate the upper portions of the double-T slab (120) and the PC beam (110) between the reinforcing ribs (123). The joint is designed to maintain the shape of the double-T joint using a pin joint method, while closing a certain section of the end with a cover panel so that the cast-in-place concrete of the connection is blocked by the cover means. However, the above background technology did not specify the structural connection details between the cast-in-place concrete and the double-T slab. Since it is unclear whether the cast-in-place concrete at the connection surface can exhibit structural behavior that induces actual negative moments even if a certain space is closed, the only section capable of forming an actual compression zone through continuity at the connection surface between the double-T slab and the supporting beam is the two rib sections of the double-T slab. This is only 12.5% of the total width of the double-T slab (in the case of a total width of 240cm, rib width 15cm × 2 = 30cm, 30/240 = 12.5%). Therefore, from a structural mechanics perspective, it is difficult to form a compression zone of the entire double-T slab and expect a reliable distribution of negative moments at the upper part of the connection. Furthermore, even if a negative moment occurs, it would be limited only to the area directly above the rib surface of the double-T slab, thus there was a clear limitation to the continuity of the double-T slab. The following drawings attached to this specification illustrate preferred embodiments of the present invention and serve to further enhance understanding of the technical concept of the present invention together with the detailed description thereof; therefore, the present invention should not be interpreted as being limited only to the matters described in the attached drawings. FIG. 1 is a perspective view of an embodiment of a double T-slab in which a middle wing panel of the present invention is formed to enable continuous joints. Figure 2 is a side cross-sectional view illustrating the constructed appearance of Figure 1. FIG. 3 is a plan cross-sectional view of the middle wing panel of the present invention. FIG. 4 is a side cross-sect