Abstract:
온도프리스트레싱 공법과 지중강관 굴착공법을 조합하여 적용함으로써 굴착이 불가능한 지중 박스구조물을 용이하게 보강할 수 있고, 또한, 온도 프리스트레싱에 의해 프리스트레싱 정착장치가 필요 없고, 지중 박스구조물의 외부에 정착부가 설치되고 온도 프리스트레싱에 의해 지중 박스구조물에 유리한 응력이 작용하도록 함으로써 지중 박스구조물의 하중저항 성능을 증가시킬 수 있고 보강재 자체의 강성을 추가할 수 있는, 온도 프리스트레싱을 이용한 지중 박스구조물 및 그 보강 방법이 제공된다.
Abstract:
PURPOSE: A pedestrian bridge construction method using a PSC girder, including a connection part anchorage is provided to definitely improve the rigidity of a connection part of an adjacent PSC girder segment. CONSTITUTION: A pedestrian bridge construction method using a PSC girder, including a connection part anchorage includes the following steps. PSC girder segments are connected with one another in a longitudinal direction and are set to the predetermined length by the PSC girder. A conduction prevention unit is installed in the PSC girder segment using an anchor bolt. A connection part strain member is installed in a strain hole of the connection part anchorage of the PSC girder segment in order to compress the connection part of the PSC girder segment. A cross beam connection panel is installed in the strain hole in order to be united with the connection part anchorage. One end of a strut (510) is installed in the connection part anchorage using an anchor. A sidewalk (500) is installed on the top surface of an upper flange of the PSC girder in order to be supported by the strut.
Abstract:
PURPOSE: A prestressed concrete (PSC) girder segment including a connection part mounting end, and a PSC girder and a construction method for a modular PSC girder bridge using the same are provided to allow a user to easily perform the installation work of a horizontal beam and surely increase the rigidity of a connection part of adjacent PSC girder segments. CONSTITUTION: A construction method for a modular PSC girder bridge using a PSC girder segment comprises as follows. The PSC girder segments are connected in a horizontal direction and are consecutively constructed so that a PSC girder (100) is constructed. A connection part tendon (150) is installed on a strain hole of a connection anchoring end of the PSC girder segment. Both ends of the PSC girder are supported in a longitudinal direction in between bridge lower structures by a bridge support so that a horizontal beam is formed in a transverse direction. [Reference numerals] (AA) Insertion; (BB) Horizontal direction; (CC) Vertical direction
Abstract:
급속시공이 가능하도록 확폭된 상부플랜지를 갖고 있어 바닥판 기능을 갖고, 상기 상부플랜지에 방호벽이 일체로 형성되고, 분절된 가로보, 지점부 격벽이 거더 측방에 일체로 형성되어 교량하부구조물 상에 거치 후 교축직각방향으로의 연결만으로도 피에스씨 거더가 완성되는 티형 피에스씨 거더에 의한 교량시공에 있어서 거더에 도입된 프리스트레스의 차이등에 의한 수직단차를 용이하게 보정할 수 있는 티형 피에스씨 거더의 수직단차 보정 방법이 개시된다. 이에 상기 수직단차 보정은 거더를 먼저 인상시켜 수직단차를 보정하고, 자중에 의하여 교량받침에 거더를 안착시켜 이루어지게 된다.
Abstract:
PURPOSE: A girder manufacturing method using a precast end segment as an end form and a girder manufactured thereby are provided to reduce manufacturing costs by efficiently using a form. CONSTITUTION: A girder manufacturing method using a precast end segment as an end form is as follows. Both ends of a girder(100) in which prestress is concentrated are manufactured as precast end segments(110). The precast end segments are separated from each other in a longitudinal direction to be located at both ends of the girder. A center segment(120) is manufactured by setting a center form between the precast end segments. The outer edge surface of the center form and the inner surface of a form for the center segment are matched each other. Concrete is placed in the center form and is cured. The center form is de-molded. [Reference numerals] (AA) Longitudinal direction
Abstract:
PURPOSE: A bridge construction method capable of vertical step correction of a T-type PSC girder is provided to secure an overturn preventing function when placing a T-type PSC girder in a bridge lower structure. CONSTITUTION: A bridge construction method capable of vertical step correction of a T-type PSC girder is as follows. A T-type PSC inner girder(100) is installed in a bridge lower structure. A T-type PSC outer girder is installed in a bridge upper structure. A vertical level difference between the girders is corrected by installing a lifting device including a hydraulic jack between the bottom of a support partition wall(140) of each girder and the top of the bridge lower structure. The girders with the top surfaces flush with each other are joined. The lifting device is removed, and the girders are lowered together under the weight thereof and settled on the bridge lower structure.
Abstract:
사회기반 구조물의 유지관리를 위한 최적 보강공법 선정과 관련된 의사결정에 있어서, 불확실성을 고려하여 의사결정 인자에 대한 각 대안의 등급을 정량적으로 평가하고, 또한, 정량적 의사결정 및 종합적 의사결정에 의해 합리적으로 보강공법을 선정할 수 있는 의사결정 방법이 제공된다. 비용 효율적인 보강공법 선정을 위한 의사결정 방법은, a) 정량적인 지표로서, 절대적 경제성을 만족하는 대안에 대해 불확실성을 고려한 상대적 경제성을 평가하는 단계; b) 정량적인 지표로서, 절대적 경제성을 만족하는 대안에 대해 불확실성을 고려한 상대적 성능을 평가하는 단계; c) 평가된 상대적 경제성과 상대적 성능을 이용하여 불확실성을 고려한 비용 효율성을 평가하는 단계; d) 정량적인 지표 이외의 정성적인 평가를 수행해야 하는 의사결정 인자를 도출하는 단계; e) 분석적 계층화법을 이용하여 정량적인 의사결정 인자와 정성적인 의사결정 인자의 가중치를 결정하는 단계; 및 f) 가중 평균법을 이용하여 각 대안별 가중 평균값을 계산하고, 이를 의사결정의 지표로 이용하는 단계를 포함하되, 의사결정은 정량적 의사결정 및 종합적 의사결정으로 이루어지는 것을 특징으로 한다. 의사결정 방법, 비용 효율성, 불확실성, 최적보강공법 선정, 경제성, 성능
Abstract:
PURPOSE: A method for construction a pier using precast segments is provided to secure enough strength in a connection part between segments and to rapidly perform a work. CONSTITUTION: A method for construction a pier using precast segments is as follows. A reinforcing bar(130) for supplying axial force is extended from a pier foundation. Precast pier segments(P) are inserted into the extended reinforcing bar. Axial force 0.3 MPa is applied to the reinforcing bar. The precast pier segments are coupled by injecting and hardening epoxy bond. Multiple precast pier segments are piled up at a desired height.
Abstract:
PURPOSE: A construction method of a column structure using a precast column unit using a sheath pipe is provided to secure the adhesion performance between precast column units, and reduce the construction period. CONSTITUTION: A construction method of a column structure using a precast column unit using a sheath pipe is as follows: A lower part(200) of the column structure is built in the ground. A first precast column unit(500) is installed on the lower part of the column structure. Second precast column units are coupled to the top of the first precast column unit, and piled up as high as the column structure height. A coping part is coupled to the second precast column unit located uppermost.
Abstract:
PURPOSE: A construction method of a steel composite bridge by mortar adhesion, and a steel composite bridge using the same are provided to reduce the working time by coupling a steel girder with a precast concrete deck. CONSTITUTION: A construction method of a steel composite bridge by mortar adhesion is as follows: Connection members are protruded from the top surface of a steel girder(S10). A concave groove is formed in the bottom surface of a precast concrete deck so that the connection members are inserted(S30). The precast concrete deck is arranged on the top of the steel girder(S40), and mortar is injected inside of the concave groove that the connection members are inserted(S50).