Abstract:
PROBLEM TO BE SOLVED: To provide an expansion steel pipe lock bolt, which easily produces a sufficient frictional resistance to reliably reinforce natural ground, even such as soft bedrock, fractured bedrock, unconsolidated natural ground which are difficult to produce sufficient frictional resistance by expansion of a steel pipe.SOLUTION: When pressurized fluid is injected to a hollow steel pipe 2 to be inserted to a bored hole 31, the steel pipe 2 is allowed to expand so that an expansion steel pipe lock bolt 1 is anchored to natural ground 30 by peripheral surface friction with a hole wall 32. The expansion steel pipe lock bolt 1 is provided with the hollow steel pipe 2 of which surface has a plurality of regularly-arranged protrusions 5, preferably made from a steel plate material having a tensile strength of 400 to 510 N/mmand an elongation equal to or greater than 20%, having a striped pattern on the surface.
Abstract:
PROBLEM TO BE SOLVED: To provide the superior natural ground reinforcing effect by uniformly injecting a consolidation material into the periphery of a reinforcing pipe in a natural ground reinforcing construction method such as preceding tunneling work and work face part reinforcing work, particularly, a natural ground reinforcing construction method for injecting and solidifying the consolidation material in the reinforcing pipe driven in the natural ground and the surrounding natural ground. SOLUTION: This natural ground reinforcing construction method forms a consolidation area in the natural ground by permeating the consolidation material in the reinforcing pipe and the surrounding natural ground by injecting the consolidation material into the reinforcing pipe by driving the reinforcing pipe having a delivery hole in a peripheral surface and having the prescribed length in the natural ground, and is characterized by injecting the consolidation material into the reinforcing pipe while transmitting vibration to the consolidation material or the reinforcing pipe or both when injecting the consolidation material into the reinforcing pipe. COPYRIGHT: (C)2004,JPO
Abstract:
PROBLEM TO BE SOLVED: To provide a method and system which is capable of measuring particle sizes of muck piles immediately after blast, at the face immediately after blast.SOLUTION: A plurality of scales 10 which emit infrared light with a prescribed intensity and have a prescribed size are placed on deposits of blast muck piles 3 at a face 1 which have occurred by rock blasting drilling, and a temperature distribution image Q of the deposits of muck piles 3 including the scales 10 is picked up by an infrared camera 20, and profiles of respective muck piles 3 and scales 10 are extracted from the temperature distribution image Q, and particle sizes of respective muck piles 3 are measured by the profiles and the prescribed size of the scales 10. Preferably, a plurality of temperature distribution images Q1 to Q4 are picked up in time series from one viewpoint P by the infrared camera 20, and profiles of respective muck piles 3 and scales 10 are extracted from the plurality of images Q1 to Q4 by an image processor 25. For example, the temperature distribution images Q1 to Q4 are picked up while continuously blowing the deposits of muck piles. Preferably, one end of a string 15 having a required length is attached to each scale 10, and the scale can be placed on the deposits by throwing.
Abstract:
PROBLEM TO BE SOLVED: To provide a tunnel structure which is not fatally damaged when natural ground causes great deformation, and also to provide a construction method of a tunnel. SOLUTION: The cross section of the tunnel 3 is widened in a widening range 17 and FRC spraying concrete 11 with high toughness is provided on a wall surface. A material with rigidity lower than that of the natural ground 1 is filled into the inner side of the FRC spraying concrete 11 with high toughness to form a shear deformation reducing layer 13, and FRC lining concrete 15 with high toughness is provided inside the shear deformation reducing layer 13. COPYRIGHT: (C)2007,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a ground stabilizing work method capable of reasonably, economically, surely, and firmly stabilizing the ground. SOLUTION: In this ground stabilizing method, ground improvement bodies 3 installed in large quantities from a ground surface 1 into the ground 2 are formed so as to become an integral arch in the ground 2 so that the ground improvement bodies 3 can develop an arch action against an external force. In place of such a conventional measure for stabilization that the entire area of an object ground 4 is uniformly stabilized, the ground improvement bodies 3 are formed so that the arch action can be developed against the external force to take a stabilization measure by adopting a reasonable structure type arch structure. Thus the formed portions of the round improvement bodies 3 can be reduced to reasonably and economically perform the stabilization o the ground and surely and firmly perform the stabilization of the ground 4 by the arch effect of the ground improvement bodies 3. COPYRIGHT: (C)2003,JPO
Abstract:
PROBLEM TO BE SOLVED: To provide a method for burying a drain pipe which exhibits high water permeability while having a simple structure and which can be inserted into ground from a surface of natural ground, and to provide the drain pipe. SOLUTION: This method for burying the drain pipe 1 made of a flexible tubular fabric with predetermined axial rigidity includes: a drain pipe insertion hole forming step of forming a drain pipe insertion hole, whose diameter is larger than that of the drain pipe, in the ground; and a burying step of burying the drain pipe by inserting the drain pipe into the drain pipe insertion hole. COPYRIGHT: (C)2010,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a drain pipe which can hardly cause expansion/contraction and torsion thereof even when buried in the ground using a rock drill, facilitate burying and connection work, and prevent breakage and degraded draining function, and to provide a drain pipe burying method. SOLUTION: A jacket pipe 1 is connected to a lost bit 3 arranged at a front end of a rod 2, and buried in the ground according to advancing of the lost bit 3 that advances upon transmission of the rotational excavation force of a rock drill 8, that is transmitted via the rod 2. The jacket pipe 1 is provided with a pipe jacket 11, and a front end cap 12 and a rear end cap 13 are provided to the front end and the rear end of the pipe jacket. Further the jacket pipe has steel wires 16 extending between the front end cap 12 and the rear end cap 13. COPYRIGHT: (C)2010,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a draining method which is applicable to the case where a drain pipe is embedded in the natural ground, and can prevent cavitation in the natural ground due to flow of fine grains and sand in the natural ground, and degradation of draining effect due to clogging of the drain pipe. SOLUTION: According to the draining method, when the drain pipe is embedded, a rotary excavation force is applied to a lost bit 3 arranged at the tip of a rod 2 via the rod 2 by a rock drill 8, and the natural ground in a tunnel construction area is excavated. Then a jacket pipe 1 in which the rod 2 is housed is connected to the lost bit 3, and therefore the jacket pipe 1 is embedded in the natural ground according to the excavation of the lost bit 3. Herein a flexible cylindrical texture is employed as the jacket pipe 1. Further a guide tube 6 is arranged between the jacket pipe 1 and the rod 2. COPYRIGHT: (C)2009,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a method and a system capable of measuring particle sizes of blast debris in a face immediately after blasting.SOLUTION: The method for measuring blast debris particle sizes includes: placing a plurality of near-infrared reflecting scales 10 of predetermined dimension on a sediment of the blast debris 3 generated in a blasting excavation of a rock-bed face 1 (a step S002); applying near-infrared light to the sediment of the debris 3 including the scales 10 to capture a near-infrared reflection image R (a step S003); and extracting profiles of the respective debris 3 and the scales 10 from the image R and measuring the particle sizes of the respective debris 3 from the profiles and the predetermined dimension of the scales 10 (steps S008-009). Preferably, the method includes: capturing, with time, a plurality of near-infrared reflection images R1-R4 from a same view point P with a camera 20 (steps S003-S005), and causing an image processor 25 to extract the profiles of the respective debris 3 and scales 10 from the plurality of images R1-R4.
Abstract:
PROBLEM TO BE SOLVED: To non-destructively evaluate a distribution of improved bodies formed on the ground.SOLUTION: The survey method includes: first, before performing soil improvement, surveying an object area of the soil improvement by a frequency-domain electromagnetic method (a step S1); injecting a cement-based material formed by mixing a magnetic substance therein, into the soi to improve the soil (steps S3 and S4); surveying the object area by the frequency-domain electromagnetic method (a step S4); and evaluating the distribution of the improved bodies based on a difference between the electromagnetic survey result before the soil improvement and the electromagnetic survey result after the soil improvement (a step S5).