KR-102964603-B1 - Precast Arch Structure With Constant Curvature

KR102964603B1KR 102964603 B1KR102964603 B1KR 102964603B1KR-102964603-B1

Abstract

The present invention relates to a precast arch structure with constant curvature, and more specifically, to a precast arch structure with constant curvature in which over-reinforcement of reinforcing bars is prevented by alternately arranging loop reinforcing bars and hook reinforcing bars, and structural stability is increased by preventing the occurrence of variable cross-sections by connecting an embedded temporary connection device to the precast arch part through a workspace formed in the area where the hook reinforcing bars are arranged.

Inventors

김성환

Assignees

(주)유니탑이앤씨
알엔비이엔씨 주식회사

Dates

Publication Date: 20260513
Application Date: 20240830

Claims (9)

As a precast arch structure, A first precast arch section including a first crown section that forms one side of an arch shape and has a lower portion of the ceiling-side cross-section formed to protrude outward; A second precast arch section including a second crown section that forms the other side of an arch shape and is formed such that the lower portion of the ceiling-side cross-section protrudes outward; A first hook reinforcing bar disposed on the inner side of the first precast arch section, wherein a portion thereof is exposed outward from the upper surface of the ceiling-side cross-section of the first precast arch section; A second hook reinforcing bar disposed on the inner side of the second precast arch section, with a portion exposed outward from the upper surface of the ceiling-side cross-section of the second precast arch section; A first loop reinforcement bar disposed on the inner side of the first precast arch section, wherein a portion thereof is exposed outwardly from the upper surface of the ceiling-side cross-section of the first precast arch section; and It includes a second loop reinforcement bar disposed on the inner side of the second precast arch section, with a portion of which is exposed outward from the upper surface of the ceiling-side cross-section of the second precast arch section; Each of the above-mentioned first precast arch section and second precast arch section is, Upper main reinforcing bars arranged along the transverse direction on the upper side of the interior; Lower main reinforcing bars arranged along the transverse direction on the lower side of the interior; and It includes a shaped reinforcing bar section comprising: a first shaped reinforcing bar having a 'ㄷ' shape, disposed inside the first crown section or the second crown section, with a portion connected to the lower main reinforcing bar; and The above lower main reinforcing bar extends to the inner side of each of the first crown portion or the second crown portion, and A precast arch structure in which, when the ceiling-side end of the first crown portion and the ceiling-side end of the second crown portion come into contact with each other, the first precast arch portion and the second precast arch portion each have a pre-set curvature along the transverse direction, and the ceiling portion of the precast arch structure does not have a variable cross-section along the transverse direction.
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In claim 1, The above-mentioned precast arch structure is, Each of the above first hook reinforcing bars and first loop reinforcing bars is included in multiple quantities, and the first hook reinforcing bars and first loop reinforcing bars are arranged alternately along the longitudinal direction of the first precast arch portion. A precast arch structure comprising a plurality of the second hook reinforcing bars and second loop reinforcing bars, wherein the second hook reinforcing bars and second loop reinforcing bars are alternately arranged along the longitudinal direction of the second precast arch section.
In claim 1, The above-mentioned precast arch structure is, It further includes an embedded temporary connecting device that connects the first crown portion and the second crown portion when the first precast arch portion and the second precast arch portion come into contact with each other by the end portion of the first crown portion and the end portion of the second crown portion coming into contact with each other. The above-mentioned buried temporary connection device is, A steel plate portion having a steel plate shape, wherein a portion is fixed to the upper surface of the first crown portion and another portion is fixed to the upper surface of the second crown portion; A first high-strength bolt that fixes the steel plate portion and the first crown portion to each other; and A precast arch structure comprising: a second high-strength bolt that fixes the steel plate portion and the second crown portion to each other.
In claim 1, The above-mentioned shaped reinforcing bar is, A precast arch structure further comprising: a second shaped reinforcing bar having a 'ㄷ' shape, disposed inside the first precast arch section or the second precast arch section, wherein a portion of the second portion is connected to the upper main reinforcing bar and another portion is connected to the lower main reinforcing bar.
In claim 1, The above-mentioned precast arch structure is, Further comprising a foundation portion including a concave keyway portion to accommodate the ground-side ends of each of the first precast arch portion and the second precast arch portion; The ground-side ends of each of the first precast arch section and the second precast arch section are chamfered at an angle of 30 to 60 degrees in each corner area, and A precast arch structure in which the ground-side ends of each of the first precast arch section and the second precast arch section are received into the inner side of the keyway section of the foundation section, and the inner side of the keyway section is grouted with a grouting material.
In claim 1, The first precast arch section and the second precast arch section each are precast arch structures made of high-performance high-strength concrete (UHPC) having a strength of 80 MPa or more.
In claim 5, Each of the above-mentioned first precast arch section and second precast arch section is, A precast arch structure further comprising reinforcing bars fixed to each of the upper main reinforcing bars and lower main reinforcing bars, and fixed to areas where a moment greater than that of the surrounding area occurs for each of the upper main reinforcing bars and lower main reinforcing bars.
In claim 1, Each of the above-mentioned first precast arch section and second precast arch section is, A precast arch structure further comprising a rib formed along the transverse direction on the outer surface and protruding upward.

Description

Precast Arch Structure With Constant Curvature The present invention relates to a precast arch structure with constant curvature, and more specifically, to a precast arch structure with constant curvature in which over-reinforcement of reinforcing bars is prevented by alternately arranging loop reinforcing bars and hook reinforcing bars, and structural stability is increased by preventing the occurrence of variable cross-sections by connecting an embedded temporary connection device to the precast arch part through a workspace formed in the area where the hook reinforcing bars are arranged. To construct an arch-shaped structure such as an open-cut arch tunnel, there are methods of pouring concrete on-site (hereinafter referred to as the on-site pouring method) and methods of utilizing precast arch-shaped members (hereinafter referred to as the precasting method). FIG. 1 schematically illustrates the ceiling of a conventional arch structure, and FIG. 1(a) schematically illustrates the ceiling of an arch structure manufactured by the cast-in-place method. As shown in FIG. 1(a), the arch structure manufactured by the cast-in-place method is structurally stable as it has no joints, and structural stability can be increased because it maintains a constant curve along the transverse direction (left and right direction based on FIG. 1) without a variable cross-section, allowing the load to be efficiently distributed. However, this cast-in-place method has the disadvantage of being inefficient in terms of economic feasibility because the construction period is prolonged and costs increase. Meanwhile, FIGS. 1(b) and FIGS. 1(c) schematically illustrate the ceiling portion of a conventional arch structure manufactured by a precast method. Generally, an arch structure manufactured by a precast method utilizes two segmented precast members. Specifically, as illustrated in FIG. 1(b), one of the conventional arch structures manufactured by the precast method may have a non-uniform cross-section because a straight section is formed in the ceiling portion to fix the joint area connecting the precast members to each other. That is, in the arch structure illustrated in FIG. 1(b), the load may not be efficiently distributed, and consequently, structural stability may be reduced and aesthetic effects may also be compromised. In addition, as illustrated in FIG. 1(c), another conventional arch structure manufactured by the precast method may have a temporary structure cast in place installed on the ceiling to temporarily fix the joint area connecting the precast members. For example, referring to claim 1 of Patent Document 1 and FIG. 9, a configuration is disclosed in which a temporary support means (30) for temporarily supporting the first segment and the second segment during construction is fixed to the top of the arch. Since such a cast-in-place block also creates a variable cross-section in the arch structure, structural stability may be reduced and aesthetic effects may also be impaired. Meanwhile, although the magnitude and direction of pressure or tensile force occurring along the transverse direction differ in arch structures, conventional arch structures use a uniform reinforcement method for the entire section, so it has been reported that some sections have excessive reinforcement and others have insufficient reinforcement. In other words, there is an urgent need to develop an arch structure that improves economic efficiency by manufacturing the arch structure using a precast method, while preventing over-reinforcement by placing more reinforcement in necessary sections and less reinforcement in unnecessary sections, and simultaneously improving structural stability by preventing the occurrence of variable cross-sections in the ceiling section. Figure 1 schematically illustrates the ceiling portion of a conventional arch structure. FIG. 2 schematically illustrates a front view and an enlarged view of the ceiling portion of a precast arch structure according to one embodiment of the present invention. FIG. 3 schematically illustrates a plan view of the ceiling portion of a precast arch structure according to one embodiment of the present invention. FIG. 4 schematically illustrates a perspective view of a ceiling portion of a conventional arch structure and a precast arch structure according to one embodiment of the present invention. FIG. 5 schematically illustrates the installation process of a precast arch structure according to one embodiment of the present invention. FIG. 6 schematically illustrates the installation process of a buried temporary connection device according to one embodiment of the present invention. FIG. 7 schematically illustrates a plan view of the ceiling portion of a precast arch structure according to one embodiment of the present invention, in a state including an embedded temporary connection device. FIG. 8 schematically illustrates the moment and reinforcement section of a precast arch stru