Abstract:
PURPOSE: A heating form using microwaves for constructing bridge foundations is provided to heat a form by being installed in the external partition of a steel form. CONSTITUTION: A heating form using microwaves for constructing bridge foundations comprises a microwave generator(15), a wave guide tube, a housing(17), and a heating unit(18). The wave guide tube delivers the microwaves from the microwave generator to the housing. The housing diffusely reflects the microwaves delivered to the wave guide tube. The heating unit generates heat by absorbing the diffusely reflected microwaves to heat the surface of heating object concrete.
Abstract:
PURPOSE: A heavy weight concrete composition using slag by-product is provided to improve strength, durability, and environmental features which are required for heavy weight concrete product. CONSTITUTION: A heavy weight concrete composition using slag by-product comprises 42-67 parts by weight of granulated blast-furnace slag, 290-310 parts by weight of rapidly cooled electric arc furnace oxidized slag, 260-290 parts by weight of thick aggregate, and 40-45 parts by weight of water based on 100.0 parts by weight of high early strength cement. The concrete composition includes chemical admixture for concrete. The density of the rapidly cooled electric arc furnace oxidized slag is 3.3-3.8.
Abstract:
본 고안은 전기차량에 전원을 공급하는 전차선과 팬터그래프간의 접촉 불량으로 발생하는 아크를 좌우 독립센서를 이용하여 탐지하여 이선율(Loss of Contact Rate)를 평가하기 위한 전차선 이선 아크 계측 시스템에 관한 것이다. 이를 실현하기 위한 본 고안은, 동일한 2개의 아크센서로 전동차 지붕의 좌우에 일정간격 이격되게 설치되어 팬터그래프의 집전판과 전차선의 접촉부위에 초점이 맞추어 있으면서 렌즈 및 필터를 장착하고 있는 광학검출부, 상기 광학검출부를 수납하면서 제어신호에 따라 수평 및 수직 방향으로 틸팅가능하여 상기 아크센서의 초점을 맞출 수 있도록 된 외함, 상기 광학검출부로 광을 탐지하는데 필요한 전기적 반송 신호를 광학검출부로 보내주고 아울러 광학검출부에서 전달되어 오는 광 검출 신호를 전기적으로 처리하면서 좌우 아크센서의 크기를 비교하여 편위여부를 판단하는 신호처리부, 상기 신호처리부에 의해 수신되는 아크, 가선 전압/전류, 아크 발생위치를 전동차의 속도, 위치 경로와 연계하여 제어함과 아울러 광학검출부의 틸팅을 제어하는 콘트롤러를 포함하여 이루어진 고안이다. 팬터그래프, 이선, 아크, 방전, 접촉불량
Abstract:
본 발명은 미기압파 저감용 등간격 수직 통풍공형 터널에 관한 것으로, 더욱 상세하게는 고속철도 터널에서 터널출구 미기압파를 저감하기 위해 터널천정으로 수직 통풍공을 형성하되, 축척모형 시험을 통해 통풍공의 간격, 수량, 내경에 대한 체적설계값을 도출시켜, 고속철도터널의 미기압파 저감대책으로 사용할 수 있으며, 터널단면적의 축소와 함께 열차의 운행속도또한 향상시킬 수 있는 미가압파 저감용 등간격 수직 통풍공형 터널에 관한 것이다. 상기의 본 발명은 터널의 상측 중앙부에 일정간격으로 통풍공을 수직 형성하여 상기 터널 내부와 연통되도록 형성하는 것을 특징으로 하되 상기 터널의 길이는 750m이며 단면적은 96㎡ 또는 87.8㎡로 형성되며 상기 통풍공의 길이는 460mm 또는 1360mm로 형성되며 내경은 16mm 또는 35mm로 형성되고 상기 통풍공의 갯수는 4개, 6개, 12개, 25개 중 어느하나로 형성되는 것을 특징으로 하는 미기압파 저감용 등간격 수직 통풍공형 터널을 통해 구현된다.
Abstract:
The present invention relates to a heating system for slab construction using a microwave, and a construction method of a slab using the same. More specifically, the present invention provides, in constructing a concrete slab, a heating system for slab construction using a microwave and a construction method of a slab using the same which is capable of noticeably reducing the construction period of a slab especially during the time when an outdoor temperature is low by reducing the initial hydration time of the concrete placed in the upper part of a steel plate by heating the steel plate of a slab mold employing a heating system for slab construction using a microwave. Upon constructing a slab by using the heating system for slab construction using a microwave according to the present invention, an entire construction period can be markedly reduced by reducing the curing period from reducing the initial hydration time of the concrete; a warm curing of concrete is made possible without the use of a heater, a fan heater, etc. in a warm curing process; and especially, the problem of uneven heating and resultant possibility of crack generation can be solved.
Abstract:
The present invention relates to a reinforced earth retaining wall used for a bridge-earthwork transition zone and including an integrated front block, and, more specifically, to a reinforced earth retaining wall used for a bridge-earthwork transition zone and including an integrated front block, wherein the earth retaining wall is designed to restrain the subsidence of the bridge-earthwork transition zone as the weak zone of a railway field by integrating the front blocks up and down, and left and right by pre-stressing, and is also designed to restrain the bridge-earthwork transition zone from subsiding depending on load transition by an arching effect maximized by connecting the pre-stressing tensile body of an integrated block structure additionally constructed on the center of a track to the pre-stressing tensile body of the front blocks into a semicircular symmetric type by a reinforcing tensile body (connecting body). According to the present invention, the constructed reinforced earth retaining wall used for a bridge-earthwork transition zone allows ground subsidence to be minimized so that: safety is improved; sections affected by the ground subsidence are reduced so as to minimize civil complaints; and land compensation sections and bridge extension sections are reduced so as to improve economic feasibility, workability, and constructability.