Abstract:
A horizontal furnace for a fire experiment of concrete structure is provided to measure a damage level by fire of the concrete structure under various temperature conditions. A horizontal furnace for a fire experiment of concrete structure includes a base(10), a heating furnace main body(20), a heating unit(30), a temperature measurement unit(60), and a controller(50). The heating furnace main body is installed on the base, has an opened cubic body, and is closed by a concrete experiment body to form a sealed space. The heating unit is installed to pass through the main body to heat an inner part of the heating furnace main body. The temperature measurement unit measures a temperature of the inner part of the heating furnace main body. The controller controls the heating unit to adjust the inner temperature of the main body along a predetermined temperature curve.
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 터널 막장의 굴착 내측면에 설치된 강지보재에 누수보강공을 쉽고 빠르게 설치할 수 있는 터널 누수보강공 장착장치에 관한 것이다. 본 발명은, 강지보재를 따라 형성되는 공극에 의한 누수로를 폐색시키기 위하여 누수로를 따라 누수보강공을 설치하되, 상기 강지보재와 누수보강공의 사이에는 일측단부가 상기 강지보재에 끼워져서 결속되는 제1 고정부가 형성되고, 타측단부는 상기 누수보강공에 끼워져서 고정되는 제2 고정부가 형성된 연결구가 배치되어 상기 강지보재와 누수보강공을 끼워맞춤식으로 결속시키고, 상기 숏-크리트가 경화된 후, 상기 누수보강공에 그라우팅용 밀크액을 포함하는 경화성 누수방지재를 주입하여 누수로를 충전시켜 폐색시키도록 된 것이다. 본 발명에 의하면 연결구를 이용하여 강지보재와 누수보강공을 끼워맞춤식으로 결속시켜서 누수보강공을 강지보재에 쉽고 빠르게 설치할 수 있기 때문에, 후속 공정을 원활하게 진행할 수 있어서 터널공사 현장의 작업 생산성을 크게 향상시킬 수 있는 우수한 효과가 얻어진다. 터널 막장, 강지보재, 누수보강공, 누수로, 숏-크리트, 누수방지재
Abstract:
PURPOSE: A water leakage control device for a tunnel is provided to prevent contamination resulting from water leakage and accidents caused by freezing. CONSTITUTION: A water leakage control device for a tunnel comprises a water leakage repair structure(110) which is installed in a water leak path caused by an aperture formed along a steel rib in a tunnel. The water leakage repair structure is formed of pipe members(120) which has a plurality of through holes(122) and connected with pipe-shaped connectors(130). A cap(150) is installed to seal one end of the water leakage repair structure. An injection device(160) is connected to the other end of the water leakage repair structure through a connector(170) and supplies a curable water leakage prevention material containing grouting milk to the water leakage repair structure.
Abstract:
A permeability test device is provided to test permeability of tunnel lining concretes with a simple method by manufacturing a tunnel lining concrete sample in the same conditions as a tunnel construction site. A permeability test device comprises a sample installation unit(10), a pressurized water supply unit(20) and a water flow metering unit(30). The sample installation unit installs lining concretes manufactured in the same conditions as a tunnel site to be tested. The pressurized water supply unit is coupled to one side of the sample installation unit in a sealed state, and applies the pressurized water to the lining concretes. The water flow metering unit collects water passing through the lining concretes of the sample installation unit and discharged to the other side of the lining concretes, and measures the flow rate.
Abstract:
A drain system of a double floor plate for a tunnel is provided to improve stability of a road pavement structure, and to reduce construction period by reducing the construction process. A drain system of a double floor plate for a tunnel includes a drain layer(110) having an auxiliary base layer or an antifreeze layer spread on a tunnel floor, a drain plate(120) having an upper block installed in an upper part of the drain layer by longitudinally and horizontally spacing blocks, a column part tapered from a lower part of the upper block and extended downward and latticed drain passages formed in the lower part of the upper block by the space with sides and front and rear parts of the tapered column part, a lean concrete layer(130) charged in the block of the drain plate, and a pavement layer(140) formed in an upper part of the lean concrete layer. The column part is longitudinally extended by rounding front and rear parts, or collecting the front and rear parts into an apex, or forming streamlined front, rear and side parts.