Abstract:
PURPOSE: A grouting device is provided to prevent a leakage of chemicals by checking the contact degree of a packer and an inner wall. CONSTITUTION: The grouting device comprises: a long cylinder rod(100); a primary chemical pipe(210) and a secondary chemical pipe(220) passing the cylinder rod(100) longitudinally and forming passages for flowing a chemical respectively; a stirrer(300) connected to the primary chemical pipe(210) and the secondary chemical pipe(220) to receive, mix and discharge chemicals from the primary chemical pipe(210) and the secondary chemical pipe(220); an injection pipe(400) connected to the stirrer(300) and provided with an exhaust hole(410) for exhausting the chemicals from the stirrer(300) to the outside soft ground; and a packer(530) installed to the appointed outer area of the cylinder rod(100) to cover the cylinder rod(100).
Abstract:
PURPOSE: An application method of two-shot shotcrete is provided to minimize a rebound rate of wet-type shotcrete mortar. CONSTITUTION: The application method of two-shot shotcrete comprises the steps of: applying B-type shotcrete mortar composed of cement, fine aggregate, water and accelerator to construct a B-type shotcrete mortar layer of adhesive coarse aggregate to a thickness of 10 millimeters on the wall of a tunnel; applying A-type shotcrete mortar composed of cement, coarse aggregate, fine aggregate, water and accelerator to construct an A-type shotcrete mortar layer to a thickness of 40 millimeters; and repeating above steps twice.
Abstract:
본 발명은 굴착시 지반의 보강 및 차수성을 향상시키고 연약지반(충적토 등)에서의 터널공사에 적용할 수 있는 직천공 강관 보강형 다단 그라우팅 시공 방법 및 직천공 장치에 관한 것으로 소정길이의 중공형상을 가지며, 그 외주연 상측부에 그라우트재를 분사시키기 위한 다수의 주입구(12)가 소정길이마다 형성되되, 상기 주입구(12) 상부면에 그의 차폐방향으로 지지가이드수단(13)이 구비되는 강관(1); 상기 강관(1) 내부에서 주입구(12)측으로 그라우트재가 역류없이 주입되도록 하기 위하여 상기 강관(1)에 연통하도록 주입구(12)에 내장되는 스트레이너(14); 및 상기 강관(1)에 연결되며, 외부의 드릴링장치로부터 구동력을 인가받아 지반을 직천공하는 비트(2)를 포함하는 직천공장치와, 비트(Bit)(2)가 장착된 소정길이의 강관(1)을 드릴링(driling) 장비를 이용하여 소정의 깊이까지 설치한 후, 강관(1)의 설계길이에 이를 때까지 계속적으로 강관을 연결, 직천공하는 제1단계; 그라우팅시 그라우트재의 역류를 방지하도록 강관(1)과 천공면(6) 사이에 소정재질의 코르킹(corking)재(3)을 장착하는 제2단계; 및 강관(1) 내부에 소정간격으로 패거(packer)(5)를 설치하고 상기 그라우트재를 주입하는 제 3단계를 포함하는 직천공 강관 보강형 다단 그라우팅 시공 방법을 제공한다.
Abstract:
The present invention relates to a method of performing heat treatment for a cutter ring of a disk cutter, capable of significantly improving impact resistance and abrasion resistance with respect to the cutter ring of the disk cutter provided in a TBM cutter head used to mechanically perform a full-surface excavation for a tunnel having a circular section, and the cutter ring of the disk cutter manufactured by the same method. The present invention provides a method of performing heat treatment for a cutter ring of a disk cutter, wherein the sectional cutter ring of the disk cutter comprises: a preform part (10) coupled with a rotational shaft and a hardening part (20) having a width narrower than that of the preform (10) and protruding radially and longitudinally. The method of the present invention comprises sequentially performing a quenching process for an entire portion of the cutter ring (1), a tempering process for the entire portion of the cutter ring (1), a process of heat treatment and high-frequency treatment for the hardening part (20) by an additional high frequency at a temperature of 1000-1050°C, and a forcible air-cooled process. Accordingly, the shock buffer region having hardness higher than that of the preform part (10) and lower than that of the hardening part (20) is formed between the preform part (10) and the hardening part (20).
Abstract:
PURPOSE: A manufacturing method of a disk cutter ring for TBM is provided to minimize the abrasion and damage of the cutter, improve the impact resistance, and reduce the abrasion. CONSTITUTION: A manufacturing method of a disc cutter ring for TBM performs the following step. For the total weight of the whole composition, B 0.01-0.03wt% is further included for the Si 0.3wt%, Mn 1.3wt%, V 1.0wt%, C 0.3-0.45wt% and Mo 2wt%. By using the multiple phase complex steel hardening composition comprised of the remainder Fe, the shape of the disk cutter ring is made by molding and the thermal process is executed. The thermal process is comprised of a releasing process which is maintaining three hours at 930°C, a quenching process which is maintaining three hours at 860°C, and a salt bath quenching thermal process which includes a salt bath process which maintains two hours at 290°C after cooling and then cooling again. [Reference numerals] (AA) Hardness [HRc]; (BB) Casting (before heat treatment); (CC) After heat treatment
Abstract:
PURPOSE: A high intensity tunnel segment optimal design method is provided to apply high strength reinforcing bars and concrete of increased compressive strength to a design and prevent excessive reinforcement. CONSTITUTION: A high intensity tunnel segment optimal design method comprises a step of individually calculating design strength on a plurality of concrete-reinforcing bars combinations and a plurality of concrete of different compressive strengths; a step of setting a predetermined safety factor and of individually calculating a required reinforcing bar section on concrete-reinforcing bars combinations; a step of extracting the concrete-reinforcing bars combinations including the required reinforcing bar section smaller than a required section of a standard concrete-reinforcing bar combination; a step of selecting the concrete-reinforcing bar combination including the required section of a minimum reinforcing bar.
Abstract:
본 발명은 토사의 간극비(void ratio)를 측정함에 있어서, 토사 시료를 엑스레이 씨티(X-ray CT) 단층촬영하되, X-ray CT 단층촬영 이미지의 최소 복셀의 크기보다 작은 크기의 토사체 입자를 가지고 있어서 공극의 가시화가 어려운 미세한 토사에 대해서도 X-ray CT 단층촬영을 통해 토사의 간극비를 측정할 수 있도록 하는 X-ray CT 단층촬영을 통한 미세 토사의 간극비 측정방법에 관한 것이다. 본 발명은, X-ray CT 단층촬영 이미지의 최소 복셀의 크기보다 작은 크기의 토사체 입자를 가지고 있고 간극비를 이미 알고 있는 표준 토사 시료에 대해 X-ray CT 단층촬영 이미지를 취득하고(S1); X-ray CT 단층촬영 이미지에서 각각의 복셀에 대해 CT값을 구하고(S2); X-ray CT 단층촬영된 영역의 CT대표값을 각 CT값으로부터 산정하여(S3); CT대표값과 토사의 간극비의 데이터를 취득하고; 상기 간극비를 달리한 복수 종류의 표준 토사 시료에 대해 복수의 간극비와 CT대표값의 데이터베이스를 구축하며(S4); 측정 대상 토사의 시료에 대한 X-ray CT 단층촬영 이미지로부터 각 복셀당 CT값을 CT대표값을 산정하고(S5); 산정된 CT대표값에 해당하는 간극비를, 기구축된 간극비와 CT대표값의 데이터베이스로부터 구함으로써(S6), 측정 대상 토사에 대한 간극비를 측정하는 것을 특징으로 한다.
Abstract:
본 발명은 이미 설치된 콘크리트 라이닝 내면에서 구멍 또는 균열을 통하여 누수 현상이 일어 날 때, 상기 구멍 또는 균열로부터 용출되는 누수를 포집하여 배수함으로써, 콘크리트 라이닝 배면으로부터 유입되는 유체가 콘크리트 라이닝의 타측으로 흘러 신축이음 등에서 더 큰 누수현상을 일으키는 것을 방지할 수 있도록 하는 터널의 콘크리트 라이닝의 누수보수장치 및 누수보수구조에 관한 것이다. 본 발명에 따르면, 집수부재(10)가 콘크리트 라이닝(100)의 누수 발생 부위의 외면에 누수 발생 부위를 덮어서 감싸도록 설치되고; 상기 집수부재(10)의 일측에는 배수관(20)이 연결되어; 상기 유체가 상기 집수부재(10)의 내측으로 들어와서 배수관(20)을 통하여 배출됨으로써 콘크리트 라이닝(100)의 누수 현상을 보수하게 되는 것을 특징으로 하는 콘크리트 라이닝의 누수보수구조와, 누수보수장치가 제공된다.
Abstract:
PURPOSE: Water-leakage repairing device and structure of tunnel concrete lining are provided to prevent the damage of concrete lining due to water leakage since the fluid from the hole or the crack of concrete lining is appropriately discharged. CONSTITUTION: A water-leakage repairing device(1) of tunnel concrete lining comprises a water collecting member(10) and a drain pipe(20). The water collecting member is attached to the outer surface of concrete lining(100). The water collecting member protects a hole or crack, through which the water leaks. The drain pipe is connected to one side of the water collecting member and discharges the fluid from the water collecting member.
Abstract:
PURPOSE: A method for draining water in vacuum using a steel pipe and stabilizing a tunnel face by controlling grouting direction is provided to improve waterproof performance and reduce subsurface water flowing into a turner face. CONSTITUTION: A method for draining water in vacuum using a steel pipe and stabilizing a tunnel face by controlling grouting direction comprises following steps. Steel pipes(10) are arranged in the shape of arch within a ceiling ground which is adjacent to an excavation side of the tunnel face according to the curve shape of the tunnel. The inside of the steel pipe installed is made in a vacuum condition and underground water is absorbed and drained. Grout material is injected into the steel pipe and an arch shaped cut-off structure is formed.