Abstract: A drawing device 4 is mounted in a drawing shaft 3, and pipe replacement device A connected with new pipes is arranged on the side of starting shaft 2, wherein the drawing device 4 and the pipe replacement device A is connected through pull-rods 5 inserted into existing pipes with each other. The pipe replacement device A is comprised of a cutting part 11 including cutter bodies 14 (shanks 14a to 14i) arranged in the axial direction and at angular intervals in the circumferential direction, an expanding part 12 having expanding rollers 18a to 18f, and a connecting part 13. Each cutter body 14 has a plurality of cutting edges, wherein distances between the respective cutting edges and the center of the circle become larger in order from the forward side toward the backward side. While the pipe replacement device A is traveled in the inside of cast iron pipes, the inner wall of cast iron pipes is cut by the cutter bodies 14 to form grooves.

Abstract: A vertical hole excavating machine having a cutter head comprising: a first head supported rotatably about the axis of a cylindrical shield body at the lower end of the cylindrical body and having a central space vertically extending therethrough; at least one first cutter mounted on the first head to excavate earth under the first head; a second head disposed coaxially in the central space so as to be mounted or dismounted from above, and having a cylindrical portion for receiving matter excavated by the first cutter therein and a bottom plate for closing the lower end of the cylindrical portion; and at least one second cutter mounted on the second head to excavate earth under the second head. It is characterized in that the second head is further provided with a notch to receive matter excavated by the second cutter into the cylindrical portion.

Abstract: A shield excavator for constructing a tunnel, a hole, a groove and the like having a polygonal, preferably, square section. The excavator (10) comprises: a cylindrical shield body (12) having a polygonal sectional shape; a cutter assembly (18) disposed at a front end portion of the shield body (12) so as to be reciprocatingly movable in a first direction intersecting at least the axis of the shield body (12); and a driving mechanism (16) for driving the the cutter assembly (18). The cutter assembly (18) includes: a plurality of serrated cutters (66) disposed at the front end of the shield body (12) at intervals in a second direction intersecting the axis of the shield body (12) and the first direction and extending in the first direction, or a plurality of plate-shaped cutters (68) disposed at the front end of the shield body (12) at intervals in the first direction and extending in the second direction.

Abstract: An abutment area is formed in which two belts 5, 6 are in contact with and confront each other. Link chains 23 carrying carrier rollers 24 are arranged in such a manner that carrier rollers 24 are disposed alternately on the back face of belt 5 and the back face of belt 6, in zigzags. The upper end is connected to winch 25, while the lower end is connected to weight 29. Link chains 23 are wound by winch 25, and link chains 23 are connected to the upper frame 17. When link chains 23 are stretched by weight 29, a force is given to respective belts 5, 6 through carrier rollers 24. Link chains 23 are released from upper frame 17, then link chains 23 are lowered and folded so that carrier rollers are positioned to be convenient for maintenance. Corridor for maintenance is unnecessary, and so cost is reduced.

Abstract: A shield tunneling machine comprises a shield body having a soil chamber, an inside chamber and a partition wall. The soil chamber has a conical peripheral surface converging gradually rearward. A crankshaft having an eccentric portion is rotatably supported by the partition wall at the center of the partition wall corresponding to the axis of the shield body. A cutter disc with roller bits is secured to a front end of the crankshaft, and a conical rotor is rotatably mounted on the eccentric portion of the crankshaft behind the cutter disc. Since the cutter disc is rotated at an increased rotary velocity by five to ten times as many as that of a cutter disc in a conventional shield tunneling machine, crushing of gravel can be efficiently carried out by the cutter disc with roller bits in cooperation with the conical rotor mounted on the crankshaft.

Abstract: A shielding apparatus comprises a cylindrical shield body, a crankshaft supported by the shield body rotatably around the axis of the shield body, a plurality of rotors successively provided in the direction of the axis in a front region ahead of the shield body and a driving mechanism for rotating the crankshaft around the axis, wherein the rotors define the outer surface of an approximately conical or truncated conical shape in conjunction with each other, and the adjoining rotors are made eccentric with respect to the axis of the shield body in the different directions from each other.

Abstract: There is disclosed a method and an apparatus for easily controlling the advancing direction of an excavating machine without causing the excavating machine to largely trace in a zigzag way. The direction control is done by the steps of mounting a reflector on a head portion of a shield body so as to receive a light beam directed along an imaginary reference line, mounting a target on a tail portion of the shield body so as to receive the reflected light beam from the reflector, controlling means for correcting the direction so that the reflected light beam may be irradiated at an objective position within the target, and thereby controlling the advancing direction of the excavating machine so that a subjective portion at the front end of the head portion may follow along the reference line.

Abstract: First and second frame assemblies (18, 20) are respectively provided with a pair of plate-like earth retainers (24, 36) and are alternately advanced by propulsion jacks (22). While the first and second frame assemblies are alternately advanced, the ground (14) is excavated to form a channel (16). A reaction force acting on the first frame assembly (18) when the second frame assembly (20) is advanced and a reaction force acting on the second frame assembly (20) when the first frame assembly (18) is advanced are respectively transmitted to the ground defining the channel by the action of first and second position maintaining force transmitting members and jacks (32, 52). When the first and second frame assemblies (18, 20) are advanced by required distances, a new pipe (12) is placed in the channel and connected to a pipe (12) already installed.

Abstract: A rectangular shield excavating machine comprises a quadrangularly tubular shield body having a space for receiving an excavated matter at the front end, a rotor disposed in the space so as to be capable of being rotated onward and backward angularly around an axis extending in the direction orthogonal to a pair of facing exterior portions of the body, and excavating means disposed in the body, drive means for rotating onward and backward the rotor angularly around the axis, and for driving the excavating means. Large gravels contained in the excavated matter are crushed by being put between the rotor and a member defining the space with the rotationally reciprocating motion of the rotor.

Abstract: A rotary actuator includes a cup-shaped piston which is movable back and forth and rotatable on its axis. A driving shaft has on its circumferential face a threaded area engaging with a threaded internal face of the cup-shaped piston. The driving shaft can be rotated on its axis during rectilinear motion of the cup-shaped piston. A rotary member has an area engaging with an outer portion of the cup-shaped piston. A casing accommodates the cup-shaped piston, the driving shaft, and the rotary member. The casing has a slit which can be tightened for securing the rotary member to the casing. A regulating member limits the length of strokes of the cup-shaped piston.

Abstract: A shield tunnelling machine is provided. Such shield tunnelling machines include a tubular shield body; an excavating cutter assembly disposed on a front end of the body; a partition wall for defining the interior of the body into a front region and a rear region; a rotor having an outer diameter gradually increasing toward the rear; a drive mechanism for turning the rotor around a first axis and rotating the rotor around a second axis eccentric to the first axis; an annular member mounted to the rotor to be turned and rotated together with the rotor and extending around the first axis; and a discharging mechanism for discharging the excavated matter to the rear region.

Abstract: A shield tunnelling machine is provided that includes a cylindrical shield body; a rotary cutter head disposed on a front end of the shield body and provided with a face plate having one or a plurality of slits extending in the radial direction; and intermediate support member for supporting a plurality of cutter bits respectively having forward bit portions and backward bit portions in each of the slits; a support structure for supporting the intermediate support member swingably around an axis extending in the radial direction; a member for movably guiding the support structure in the axial direction of the shield body; and a cylinder device and a piston for moving the support stucture in the axial direction of the shield body to move the cutter bits toward and away from the front face of the face plate, the face plate and the guide member sharing the excavation force exerted against the cutter bits.

Abstract: A system for boring a hole in the ground including an excavating machine provided with a tubular body; an excavating mechanism supported by the body; a mechanism for shifting the excavated substances to the periphery of the body; and a driving mechanism for operating the excavating mechanism.

Abstract: A direction correcting device for a shield tunnelling machine having a shield body provided with a head portion and a tail portion following the head portion corrects the direction of the head portion relative to the tail portion. The device includes three jacks, each jack having two connecting portions relatively displaced in the axial direction of the tail portion, and a connecting body for interconnecting the head portion and the tail portion to permit the head portion and the tail portion to swing and to prevent the head portion and the tail portion from relatively displacing in the axial direction of the tail portion. Each of the jacks is connected at one connecting portion to the head portion and connected at the other connecting portion to the tail portion. The jacks and the connecting body are disposed around the axis of the tail portion at angular intervals.

Abstract: The present invention relates to an inside processing apparatus for performing operations of cleaning, grinding, cutting and the like toward an inside of piping of a water pipe, a gas pipe, a wire pipe and the like. The said inside processing apparatus is constituted by possessing a working head having the working member (tool) for performing a fixed work on the cylindrical wall surface, a driving mechanism for moving the said working member in the circumferential direction of the cylindrical wall surface and a cutting controlling mechanism for controlling a quantity of the movement in company with a fact that the said working head is moved in the radial direction of cylindrical wall surface by the said driving mechanism.

Abstract: The present invention relates to a conveying method and a conveyor apparatus for the inclined conveyance including the vertical conveyance of materials by superposed two belts and pinching and holding the material to be conveyed between the belts. The present conveying method is characterized by the fact that two belts which are oppositely arranged are superposed. Tensile forces in the direction of the width of the belts is applied to the said superposed belts. Pinching and holding forces for pinching and holding the material to be conveyed between the belts is generated in the superposed belts by the tensile forces, and the material to be conveyed is conveyed by moving the superposed belts in the longitudinal direction.

Abstract: A liner for pipeline repair is provided that includes an elastically deformable sleeve having impermeability, a base having a sheet-like base portion disposed inside the sleeve, wound into a cylindrical form, and expandable radially and fixing means disposed in the base for maintaining the base portion in a subtantially cylindrical form when the base portion is expanded radially within the sleeve. The liner is used for preventing the outflow of water from a pipeline such as a sewer pipe and/or the inflow of water into the pipeline.

Abstract: An intermediate pipe-jacking apparatus is adapted to propel pipes such as sewer pipes, conduit pipes and the like in the ground between a start shaft and a destination shaft in order to install the pipes in the ground. More specifically, the intermediate pipe-jacking apparatus disposed between the pipes to be propelled comprises a movable frame disposed inside the pipes, a plurality of hydraulic jacks supported by the frames, and an operating mechanism for shifting the hydraulic jacks between the operative position between the end faces of the pipes and the inoperative position inside the pipes, wherein the frame is provided with a pair of hollow end frame members, and a plurality of rod members rotatably supported by the respective end frame members, and each rod member is pivoted by the operating mechanism so as to displace the hydraulic jacks between the operative position and the inoperative position.

Abstract: A crushing machine comprises crushing means including a first rotary member rotatable about a first axis; a second rotary member for crushing substances to be crushed in cooperation with the first rotary member, the second rotary member being rotatable about a second axis parallel to or inclined to the first axis and defining, in cooperation with the first rotary member, a crushing chamber for crushing the substances to be crushed, guide means for receiving the substances and the guiding the received substances to the crushing chamber; and drive means for rotating the first or second rotary member. Each rotary member includes a rotor, and the guide means includes a hopper. Each rotary member is disposed to be rotatable about a vertically extending axis or a horizontally extending axis.

Abstract: A vertical type conveyor comprises a support; a plurality of belt pulleys rotatably supported by the support; a pair of endless conveyor belts traveling around the plurality of belt pulleys and defining an abutment area, in which the pair of conveyor belts are in contact with each other so as to confront each other; and a plurality of sets of roller assemblies supported by the support and disposed opposite to each other in the cross direction of both conveyor belts in the abutment area, wherein each roller assembly has a pair of carrier rollers for pinching both conveyor belts at respective lug portions of both conveyor belts, and the axes of rotation of two pairs of carrier rollers of each set of roller assemblies are set so as to gradually come closer to each other toward the proceeding direction of both conveyor belts.