Abstract:
본 발명은 수중을 가로지르는 형태의 수중교량을 연속압출공법으로 가설하기 위하여, 단독으로 또는 끝단압출장치와 힘을 합하여 교량본체를 전진 이송시킴으로써 수중교량의 시공성을 향상시키고 특히 연장길이가 길고 수심이 깊은 수중교량도 쉽게 가설할 수 있도록 하며, 더 나아가서는 이러한 장치를 매우 간단한 구조에 의해 실현할 수 있는 수중교량 가설용 연속압출장치, 그리고 특히 수심이 깊고 연장길이가 긴 수중교량을 쉽게 가설할 수 있는 수중교량 연속압출공법을 개시한다. 본 발명에 따른 수중교량 연속압출장치는, 교량본체(10)의 상부를 덮어 지지하는 하우징(110); 상기 하우징(110)을 수저 지반에 고정하는 지지구조물(111); 상기 하우징(110) 내에 상, 하 방향으로 이동가능하게 설치되고, 하면에는 압출 방향 전방으로 갈수록 상향 경사진 미끄럼면(121)이 형성되어 있는 상부승강블록(120); 하면에 상기 상부승강블록(120)의 미끄럼면(121)에 대응한 경사면(131)이 형성되어, 상기 경사면(131)이 상기 상부승강블록(120)의 미끄럼면(121)에 미끄럼 이동 가능한 상태로 결합되는 하부미끄럼블록(130); 및 상기 상부승강블록(120)의 상부 하우징(110)에 장착되어 상하방향으로 신축함으로써 상부승강블록(120)과 하부미끄럼블록(130)을 상승 및 하강시키는 승강용 잭장치(140)를 포함한다. 이러한 본 발명의 수중교량 연속압출장치는, 상기 승강용 잭장치(140)를 신장시켜 상기 상부승강블록(120) 및 하부미끄럼블록(130)을 아래로 누르는 것에 의해 상기 교량본체(10)가 아래로 밀려 내려가서 상기 하우징(110)으로부터 이격되 고, 상기 하부미끄럼블록(130)이 상기 상부승강블록(120)의 미끄럼면(121)을 따라 전방으로 상향하여 미끄러지면서 이동되는 것에 의해 교량본체가 전방으로 이동된다. 수중, 부유, 교량, 터널, 압출, 하우징, 경사면
Abstract:
PURPOSE: A submerged dry dock for connecting an underground tunnel and a submerged tunnel and a tunnel construction method using the same are provided to reduce the construction cost and to finish the tunnel connection process in a short period by constructing one successive tunnel by easily connecting an underground tunnel and a submerged tunnel under the water. CONSTITUTION: A submerged dry dock(30) for connecting an underground tunnel and a submerged tunnel is composed of a hollow main body(40), a rear door(50), a front door(55), and a seal(60). The main body is installed under the water of the coast and has an opening(42). The rear door is opened from the rear of the main body to an underground tunnel(10). The front door is opened from the front of the main body to a submerged tunnel(5). The seal is mounted to the frame of the front door.
Abstract:
A floating type underwater bridge is provided to have flexibility and high stiffness not to be damaged by floating objects in the water. A floating type underwater bridge(100) includes a core main body(110) having a hollow for people or vehicles to pass through, fiber reinforced composites(121,123) made of FRP composites having excellent durability against chlorination and high stiffness, covering the core main body and having plural cells(125) in the longitudinal direction to have shock absorbing effect against an external impact and to supply buoyant force to the floating type underwater bridge, fillers(130) made of radiation shielding concrete and filled in the cells of the fiber reinforced composites, and a cable(140) connecting the core main body covered with the fiber reinforced composites to the bottom of the sea to be located in the seawater.
Abstract:
본 발명은 교량 등의 구조물에서 상부의 구조물과 하부의 구조물 사이에 설치되어 구조물에 작용하는 지진하중에 의한 진동 등을 마찰력에 의하여 감쇠시키는 장치로서, 지진하중에 의한 변위가 증가하게 되면 그에 따라 마찰력도 증가하게 되어 대변위 및 잔류변위가 발생하지 않도록 하는 새로운 구조의 가변마찰받침에 관한 것이다. 본 발명에서는 교각 등의 하부 구조물에 결합되는 하부받침(2)과; 교량의 거더 등의 상부 구조물에 결합되는 상부받침(3)을 포함하여 구성되며; 상기 하부받침(2)의 중앙에는 오목한 형태의 마찰부(4)가 형성되어 있고; 상기 상부 받침(3)에는 마찰돌출부(5)가 돌출형성되어 있어, 상기 마찰돌출부(5)는 상기 마찰부(4) 내에 위치하게 되고, 지진하중이 작용하여 상부 구조물이 움직이게 되면 상기 마찰돌출부(5)는 상기 마찰부(4) 내에서 움직이면서 마찰력을 일으키며; 상기 마찰부(4)의 표면은 상기 마찰돌출부(5)의 이동이 커짐에 따라 더 큰 마찰력을 발휘할 수 있도록 변화되는 마찰계수를 가지는 것을 특징으로 하는 가변마찰받침이 제공된다. 감쇠장치, 질량체, 가변, 강성, 진동제어
Abstract:
A stress ribbon bridge using a vertical fiberboard and a precast composite fiber reinforced plastic deck is provided to construct a bridge economically and to extend the span length of a bridge by reducing the dead weight of a bridge deck and the horizontal tensile force required for bridge construction. A stress ribbon bridge(1) using a vertical fiberboard and a precast composite fiber reinforced plastic deck includes abutments(10) installed on two ends of the bridge, plural precast composite fiber reinforced plastic decks(20) placed and assembled between the abutments, two or more strap type vertical suspension fiberboards(30) installed between the abutments in the longitudinal direction of the bridge to support the bottom of the precast composite fiber reinforced plastic decks, and a prestress fiberboard(40) placed through the precast composite fiber reinforced plastic deck in the longitudinal direction of the bridge and tensed/anchored to apply tensile force on the precast composite fiber reinforced plastic deck. In addition, a curved projection is formed on a part where the precast composite fiber reinforced plastic deck and the suspension fiberboard are in contact to prevent the sudden change in curvature, thereby to prevent local stress concentration, and a low friction material such as Teflon is placed on a part where the precast composite fiber reinforced plastic deck and the suspension fiberboard are in contact or coated on the projection to minimize frictional stress between the precast composite fiber reinforced plastic deck and the suspension fiberboard.
Abstract:
A variable friction bearing is provided to prevent large displacement and residual displacement by increasing frictional force if the displacement of an upper structure is increased by earthquake load. The variable friction bearing(1) contains a lower bearing(2) coupled to a lower structure such as a pier, etc. and provided with a concave friction part(4) at the center, and an upper bearing(3) coupled to an upper structure such as a girder of a bridge, etc. and provided with a convex friction part(5) to move in the concave friction part of the lower bearing to occur frictional force if the upper structure moves due to earthquake load.
Abstract:
A dual-stage tuned mass damper device using an MR fluid type brake and a method for controlling vibration of a structure using the same are provided to efficiently reduce the response of a main structure by actively changing the rigidity of the damper device through a rigidity adjusting apparatus to tune the damper device to a higher frequency band. A dual-stage tuned mass damper device(10) using an MR fluid type brake includes a mass body(11), a variable rigidity spring member(12), and an attenuator(13). The mass body has a predetermined mass. The variable rigidity spring member is installed between the mass body and a main structure(1). The attenuator has a predetermined attenuation coefficient. The variable rigidity spring member has a first spring(12a), a second spring(12b), and a rigidity adjusting apparatus(20). The first spring is installed between the main structure and the rigidity adjusting apparatus, and the second spring is installed between the rigidity adjusting apparatus and the mass body. The rigidity adjusting apparatus is formed of the MR fluid type brake whose movement is fixed by the solidified fluid in case that a magnetic field is formed.
Abstract:
A dual-stage tuned mass damper device and an oscillation control method for a structure using the same are provided to have an efficient response reduction effect according to the characteristics of load by changing the rigidity of a spring member through the control of a rigidity adjusting apparatus. A dual-stage tuned mass damper device includes a shaft(14) whose one end is fixed to a main structure, and the other end has a movable mass body(11). A rigidity adjusting apparatus(20) of a variable rigidity spring member(12) is installed in the shaft to be movable along the shaft. A first spring(12a) and a second spring(12b) are connected to the rigidity adjusting apparatus to surround the shaft. The rigidity adjusting apparatus changes the whole rigidity of the tuned mass damper device according to load by changing the rigidity of the spring member through the control of contraction of the first spring.