Abstract:
본 발명은 커터링의 경도를 향상시켜 충격 저항성을 향상시키는 반면 마모를 저감시키기 위한 TBM용 고경도 디스크 커터링의 다상 복합주강 조성물에 관한 것이다. 본 발명은 TBM용 디스크 커터링의 제조를 위한 합금 조성에서, 전체 조성물의 총 중량에 대하여 Si 0.3wt%, Mn 1.3wt%, V 1.0wt%, C 0.3∼0.45wt%, Mo 2wt%에 대하여 B 0.01∼0.03wt%을 첨가하고 잔부 Fe로 조성하고 930℃를 3시간 유지하는 풀림공정, 860℃를 3시간 유지하는 소입공정 및 냉각 후 290℃를 2시간 유지한 후 재냉각하는 염욕공정을 포함하는 염욕담금질 열처리방법에 의해, 커터링의 경도, 내마모성 및 내충격성을 향상시켜 커터의 마모와 파손을 최소화할 수 있는 특징이 있다.
Abstract:
PURPOSE: An assembly device of precast segments, an assembly method of the precast segments using the same, and a tunnel lining structure thereby are provided to easily and rapidly perform the assembly connection between precast segments. CONSTITUTION: An assembly device of precast segments comprises a first embedment body (10), a second embedment body (20), and a connection rod (30). The first and second embedment bodies comprise an end finishing plate (3) including a container type main body (2) and a protrusion insertion member (4). Both ends of the connection rod are individually inserted into the main body of the first embedment body and the main body of the second embedment body. When the adjacent precast segments are pressurized, the both ends of the connection rod are connected to the embedment bodies so that the precast segments are successively connected.
Abstract:
PURPOSE: A method for designing TBM(Tunnel boring Machine) specifications by using a statistical model based on a database is provided to enable reliable TBM manufacture even in an uncertain excavation target ground condition by calculating and designing the maximum specification of an TBM based on a database by past TBM design/construction results. CONSTITUTION: TBM design and construction result information is formed into a database. TBM specifications of the database and information related to the design of a cutter head installed in a TBM are statistically analyzed. The maximum thrust, maximum torque, and operating power of the TBM, the maximum revolution of the cutter head, the number/average intervals of disk cutters, an optimal design condition of the cutter head are estimated based on a statistical analysis result of the database and design conditions of the TBM and the disk cutter. A cutter interpenetration depth, satisfying the capacity of the disk cutter applied to the optimal design condition, is calculated. [Reference numerals] (AA) Inputting design conditions; (BB) Estimating essential TBM specifications; (CC) Estimating an optimal design condition of a TBM cutter head; (DD) Supposing the maximum cutter interpenetration depth per one rotation of the cutter head; (EE) Checking the capacity of a disk cutter(using a cutter force prediction model); (FF) Calculating a target cutter interpenetration depth satisfying the maximum TBM specifications; (GG) Checking the maximum TBM capacity; (HH) Calculating a drilling rate; (II,KK) No; (JJ,LL) Yes
Abstract:
PURPOSE: A construction method of a block type underground grout structure including vacuum drain hole formation and grout injection direction control by vacuum drainage is provided to construct a complete underground grout structure without discontinuities. CONSTITUTION: A construction method of a block type underground grout structure including vacuum drain hole formation and grout injection direction control by vacuum drainage is as follows. Injection holes(10) and vacuum drain holes(20) are bored at certain intervals in the ground. The vacuum drain holes are made into vacuum state while injecting grout into the injection holes, thereby leading the grout injected into the injection holes toward the vacuum drain holes. Bulbs are formed by the grout which flows from the injection holes toward the vacuum drain holes. Grout is injected in the vacuum drain holes so that an underground grout structure is formed.
Abstract:
PURPOSE: A drawing test machine for a rock bolt is provided to accurately measure the drawing force of a pure rock bolt with excluding influence due to shear force or bending. CONSTITUTION: A drawing test machine for a rock bolt comprises a support frame(11), a pulling shaft(12), a cradle member(13), and a pulling cylinder(14). The support frame is installed on the surface to support the device. A connecting rod(121) is formed on the lower end of the pulling shaft to hold the upper end of a rock bolt(2). The cradle member is installed on the support frame. The pulling cylinder comprises a sphere convex part(141) corresponding to the concave part of the cradle member. The pulling cylinder applies the pulling load on the pulling shaft.
Abstract:
PURPOSE: A steel lattice girder, which reinforces or supports the excavation surface of a tunnel, and a coupler for the same are provided to improve workability by reducing the weight of an H-steel support material. CONSTITUTION: A steel lattice girder comprises a first bar contact part, a second bar contact part, a third bar contact part, a first slope, and a second declined part. The first bar contact part is combined with a first bar(11). The second and the third bar contact part are combined with a second bar(12) and a third bar(13) at the first bar contact part. Two first slopes interlink with the first bar contact part and the second bar contact part at a tilt. The second declined part interlinks with the first bar contact part and the third bar contact part at a tilt.
Abstract:
PURPOSE: A jig for testing steel lattice girders and a loading test method for steel lattice girders using the jig are provided to stably support second and third bars of a triangle steel lattice girder from sides. CONSTITUTION: A jig for testing steel lattice girders comprises a main body(20) and a side fixing member(30). The main body provides a space(S) in which a triangle steel lattice girder(1) is placed in the shape of inverted triangle. The side fixing member is installed on the top of the main body and transformed in the transverse direction to fix a side of the triangle steel lattice girder.
Abstract:
A method for estimating stress in a tunnel shotcrete lining is provided to measure the stress on any shape of tunnel cross section and to reduce the measuring time and cost by not using stress sensor. A method for estimating stress in a tunnel shotcrete lining comprises a step of punching a measurement hole(1) in a shotcrete lining(10) at the measuring point of the tunnel cross section, a step of measuring the diameter of the measurement hole while performing excavation of tunnel and measuring the diameter variation of the measurement hole at each procedure of the tunnel excavation, and a step of reading the applied stress value of the shotcrete lining corresponding to the diameter variation of the measurement hole based on a database which is established based on data about the relation between the applied stress of the shotcrete lining and the diameter change of the measurement hole.
Abstract:
An electrical resistivity survey device is provided to measure an inner structure and a hydrous state of a ground at the same time by integrating a moisture sensor with an electrode unit for measuring resistance. An electrode unit(100) for measuring resistance measures resistivity inside the ground. A moisture sensor(200) senses the hydrous state inside the ground. The hydrous state of the ground is determined by the potential of the water included in the ground. The electrode unit for measuring the resistance and the moisture sensor are integrated as one body. The electrode unit for measuring the resistance and the moisture sensor are connected through a cable(110). A controller(300) produces the structure and the hydrous state inside the ground by analyzing a signal of the electrode unit and the moisture sensor. A display unit(600) displays data about the structure and the hydrous state inside the ground produced by the controller to the outside. A key operating unit(700) inputs the command signal for outputting the data about the structure and the hydrous state inside the ground.