Abstract:
The present invention relates to a method for manufacturing a strand and a strand manufactured by the method, which is easy to manufacture and achieves high quality by assuring high measurement precision of a linear sensor by preventing the linear sensor from being damaged, by using a core of a structure capable of preventing crack, deformation and damage of an FRP because the linear sensor is buried in the FRP with excellent durability and a steel is covered on the outer circumference of the FRP. In the present invention, a strand is manufactured by: manufacturing an FRP rod (10) in which a linear sensor (3) is buried; manufacturing a core (1) by coating the outer circumference of the FRP rod (10) with a steel sheath (20); and arranging a surrounding steel (2) around the core and then performing a work of twisting the surrounding steel (2). The linear sensor (3) is buried inside, and a plurality of surrounding steels (2) are twisted around the core (1) of the strand.
Abstract:
The present invention relates to a manufacturing method for a strand and a strand manufactured by the same. In the manufacturing method for a strand, a core wire where a linear sensor such as an optical fiber sensor is embedded in the center thereof is placed in the center, multiple surrounding steel wires are placed around the core wire, and then a strand is manufactured by winding the surrounding steel wires. The strand can have a high accuracy in measurement by firmly integrating the linear sensor with the core wire, can be easily manufactured, and can provide excellent quality by removing concerns over damage to the linear sensor. In the present invention, prepared are a first semi-cross section unit (10) and a second semi-cross section unit (20) where a core wire (1) having a circular cross section is made when the planes thereof are in contact with each other. A concave unit (11) is lengthily extended in the center of the plane of the first semi-cross section unit (10). A linear sensor (3) is placed in the concave unit (11), and an adhesive is filled in the concave unit (11). The core wire (1) is formed by making the plane of the second semi-cross section unit (20) be in contact with the plane of the first semi-cross section unit (10). Surrounding steel wires (2) are placed around the core wire (1) and are wound.
Abstract:
The present invention relates to a composite structure of a structural steel girder by a shear connector and concrete and a constructing method thereof and, more particularly, to a composite structure of a structural steel girder by a shear connector and concrete and a constructing method thereof capable of being easily assembled at the upper part of a web of the steel girder in which an upper flange is not existed to be integrated in a mechanical type without the welding, in which the sheer connection between the web of the steel girder and the concrete is strongly formed as the shear connector having an expansion shear key head with cross section expanded in a longitudinal direction of the steel girder is installed and a concrete unit is formed in order for the shear connector to be buried. The present invention provides the composite structure of the structural steel girder buried in the concrete and the concrete and the constructing method thereof by connecting the shear connector for delivering shear force between the concrete unit (200) and the steel girder (100) to the web. The shear connector comprises a pair of insertion plates (11) and an expansion shear key head unit (12), fixed to the web as the upper end of the web (110) of the steel girder (100) is inserted into a gap between insertion plates (11), and buried in the concrete (200) formed at the upper part of the web (110) of the steel girder (100).
Abstract:
본 발명은 섬유를 함유하며 150MPa 이상의 압축강도를 가지는 초고성능 콘크리트(Ultra High Performance Concrete/UHPC)를 이용하되, 복수개의 링 형상 부재로 분할하여 제작한 후 이를 조립하여 맨홀 뚜껑을 이루도록 함으로써, 내구성이 우수하고 경제성이 좋으면서도 이동 및 취급이 용이하도록 구성한 신규한 맨홀 뚜껑에 관한 것이다. 본 발명에서는 UHPC로 제작되어 수평한 상면을 가지며 관통구멍이 형성되어 있어 링 형상을 가지는 복수개의 링부재와, UHPC로 제작되어 수평한 상면을 가지는 중앙부재(30)로 이루어지되; 상기 복수개의 링부재는, 관통구멍이 상면에서 하면으로 갈수록 구멍의 지름이 작아지도록 테이퍼지게 형성되어 오목부를 이루어서, 상기 오목부가 중앙에 형성되어 있는 복수개의 링부재가, 작은 링부재가 큰 링부재의 오목부에 놓여 겹치는 방식으로 배치되고; 상기 중앙부재(30)는 상면에서 하면으로 갈수록 지름이 좁아지는 테이퍼형 원뿔기둥의 형상을 가지고 있어, 가장 작은 링부재의 오목부에 안착되어 복수개의 링부재와 중앙부재(30)가 상면이 평평한 하나의 평면을 가지는 판형상의 맨홀 뚜껑(1)을 이루는 구조를 가지며 상기 링부재들과 상기 중앙부재(30)는 UHPC로 제작되는 조립식 초고성능 콘크리트 맨홀 뚜껑이 제공된다.
Abstract:
본 발명은 콘크리트에 강섬유를 첨가하여 보강함에 있어서, 강섬유를 이용하여 원통형의 망을 형성하고 이러한 원통형 강섬유 망을 거푸집에 배치한 후 콘크리트를 타설함으로써, 단편 형태의 강섬유를 콘크리트에 혼입할 때 강섬유의 방향성 생성 문제를 해결하면서도 원통형 강섬유 망에 의해 콘크리트의 강도를 보강할 수 있도록 하는 원통형 강섬유 망을 포함하여 보강된 콘크리트 구조물에 관한 것이다. 본 발명에서는, 강섬유가 격자형으로 배열된 망으로 이루어져 있되, 격자형 강섬유 망이 원통형으로 감겨져서 원기둥 형상을 이루고 있는 원통형 강섬유 망(1)이 거푸집(10) 내에 담겨진 상태에서 콘크리트가 타설되어, 상기 원통형 강섬유 망(1)이 콘크리트 내에 일체로 매립되는 구성을 가지 것을 특징으로 하는 강섬유 혼입 콘크리트 구조물이 제공된다.
Abstract:
PURPOSE: A reinforced concrete structure having a cylindrical steel fiber mesh is provided to improve the strength of concrete by uniformly distributing steel fiber to the required parts of concrete. CONSTITUTION: A reinforced concrete structure having a cylindrical steel fiber mesh is composed as follows. Cylindrical steel fiber meshes(1) are formed by winding latticed steel fiber in a cylindrical shape. The cylindrical steel fiber meshes are put into a form(10). Concrete is placed in the form to integrally bury the steel fiber meshes in the concrete.
Abstract:
본 발명은, 초고성능 콘크리트를 이용하여 지면에 개방되는 맨홀의 개방구를 덮는 맨홀 뚜껑을 제작함에 있어서, 맨홀 뚜껑을 감는 밴드를 이용하여 횡방향으로 프리스트레스를 도입함으로써 인장강도를 보강한 신규한 구성의 맨홀 뚜껑에 관한 것이다. 구체적으로 본 발명에서는 원판 형상을 가지도록 UHPC로 제작된 본체(11)로 이루어지고; 중앙부에는 원판형 인장저항 강재(2)에 배치되어, UHPC를 타설할 때 상기 인장저항 강재(2)의 상부가 본체(11)에 일체로 매립된 상태로 구비되어 있으며; 상기 UHPC는, 시멘트, 실리카흄, 잔골재, 충전재, 감수제, 섬유 및 배합수로 이루어지고, 굵은 골재는 포함하지 아니하며 150MPa 이상의 압축강도를 가지는 UHPC인 것을 특징으로 하는 초고성능 콘크리트 맨홀 뚜껑이 제공된다.
Abstract:
PURPOSE: A connection structure of a column member and a cast-in-place concrete pile and a construction method thereof are provided to reduce construction costs by minimizing the size of the cross section of the column member and the cast-in-place concrete pile. CONSTITUTION: A construction method of a cast-in-place concrete pile comprises following steps. A pipe member(10) is installed on the upper part of the cast-in-place concrete pile. The lower end of a pre-cast column inserted into the pipe member is integrated with a tip cap member(21). The lower surface of the tip cap member and the upper surface of the mounting member are connected to have corresponding shapes.
Abstract:
PURPOSE: A cable stayed bridge equipped with a cross beam of a box structure is provided to reduce the construction period by forming a cross beam connected to an upper girder in a box structure. CONSTITUTION: A cable stayed bridge equipped with a cross beam of a box structure comprises a cross beam(100). The cross beam comprises a bottom plate(110) and a box portion. The bottom plate is vertically formed. The bottom plate is formed in a rectangular shape. The box unit is formed on the vertical bottom of the bottom plate in an reverse ladder shape. The box unit is extended to the horizontal direction of the bottom plate. The box unit comprises two side walls(121) and a lower flange(123). The side wall is inclinedly connected to both vertical sides. The lower flange closes the lower end of the side wall. A box type space(101) is formed on the bottom plate, the side walls, and the lower flange.