JP2010236314A - Vertical shaft excavator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vertical shaft excavator suitable for efficient excavation. <P>SOLUTION: This vertical shaft excavator includes: a main frame 3 which is lowered in the state of being suspended in a vertical shaft 2, which is fixed to a pit wall in the state of making the vertical shaft 2 agree with a center position, and which is equipped with an opening 60 for carrying out removed soil, allowing the passage of a means for discharging excavated sediment; a revolving frame 4 which is driven for revolution by being arranged in the main frame 3 in such a manner as to be revolved on the central axis of the main frame 3; a swing boom 5 which is provided at the lower end of the revolving frame 4, which has a base end connected to the horizontal axis in the direction of a normal line with respect to the radial direction of the vertical shaft 2, and which is arranged swingably in the radial surface of the vertical shaft 2 with respect to the revolving frame 4; and an excavation unit 6 which is provided at the leading end of the swing boom 5, which has a base end connected to the horizontal axis in the direction of the normal line with respect to the radial direction of the vertical shaft 2, which is arranged swingably in the radial surface of the vertical shaft 2 with respect to the swing boom 5, and which excavates natural ground by rotating a cutter head 7 arranged at a leading end. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a shaft excavator.

  Conventionally, as this type of shaft excavator, there are an excavator using a cutter and an excavator using a breaker (see Patent Documents 1 to 3).

  In patent document 1, it is a full-section excavator, the full-section excavator is supported on the wall of a vertical shaft by a gripper, and a cutter divided into a center cutter and an outer cutter is driven and rotated by a drive motor. In addition, the central cutter protrudes downward from the outer cutter to provide a step between the two cutters, and a slip reservoir is provided in the preceding excavation portion by the central cutter so as to improve the efficiency of the slipping work.

  In Patent Document 2, when excavating a large-diameter vertical hole, firstly excavating a small-diameter guide hole, inserting a pipe into the guide hole, and then draining the pipe, A bucket for earth and sand discharge is suspended in the pipe. Then, the excavating arm is rotated to excavate a large-diameter hole, the excavated earth and sand is dropped into a bucket in the pipe, and the excavated earth and sand are discharged by lifting the bucket.

  In Patent Document 3, an inner frame that is swiveled by swivel driving means is attached to an outer frame that is fixedly arranged in the shaft, and a hydraulic breaker is provided as an excavating means from the inner frame, and the hydraulic breaker is cut into a rock mass. It is crushed and excavated while being inserted, and the excavation range is expanded to the entire cross section of the shaft by the turning drive means.

JP-A-6-294276 JP-A-6-146762 JP-A-6-88475

  However, in the shaft excavator shown in Patent Documents 1 and 2, since the most section of the shaft is excavated by a cutter that rotationally drives, there is a problem that the excavation cannot be efficiently performed when the ground is hard. In addition, if the rotational driving force of the cutter is increased on the assumption that the ground is hard, the rigidity of the frame supporting the driving force needs to be increased, and there is a problem that the weight cannot be reduced.

  Moreover, in the shaft excavator shown in Patent Document 3, a hydraulic breaker that crushes and excavates while cutting into the rock is used, and the excavation range is expanded to the entire cross section of the shaft by the turning drive means. There was a problem that could not be excavated efficiently.

  The present invention has been made in view of the above-described problems, and an object thereof is to provide a shaft excavator suitable for efficient excavation.

  The present invention relates to a mainframe having a soil discharge opening that is suspended in a shaft and descends, is fixed to a shaft wall in a state in which the vertical shaft and the center position coincide with each other, and through which excavated sediment discharging means passes. A swivel frame arranged to swivel around the central axis of the main frame and driven to swivel with respect to the main frame, and a horizontal axis normal to the radial direction of the shaft provided at the lower end of the swivel frame A swing boom that is connected to the base end and is swingable in the radial plane of the shaft with respect to the revolving frame, and a normal direction to the radial direction of the shaft provided at the tip of the swing boom An excavation unit in which the base end is connected to the horizontal axis of the shaft, and is disposed so as to be capable of swinging in a radial plane of the shaft with respect to the swing boom, and excavating a natural ground by rotating a cutter head disposed at the tip; Having And features.

  According to the present invention, the revolving frame arranged to revolve around the central axis of the main frame with respect to the main frame and driven to revolve, and the normal direction to the radial direction of the shaft provided at the lower end of the revolving frame The base end is connected to the horizontal axis, and the swinging boom is disposed so as to be swingable in the radial direction plane of the vertical shaft with respect to the revolving frame, and the radial direction of the vertical shaft provided at the tip of the swinging boom The base end is connected to the horizontal axis in the normal direction, and is arranged so as to be able to swing in the radial plane of the shaft with respect to the swinging boom, and the cutter head placed at the tip is rotated to excavate natural ground. A drilling unit.

  For this reason, the excavation unit can be swiveled in the vertical shaft by the revolving frame, and the natural ground in the vertical shaft can be excavated by the cutter head of the excavation unit, so that even hard ground can be efficiently excavated. In addition, by sequentially setting the excavation radius by the cutter head in the shaft according to the swing angle position of the swing boom and the excavation unit, it is possible to excavate the whole area of the ground of the shaft, and the swing boom Further, by increasing the excavation radius by selecting the rocking angle position of the excavation unit, it is possible to excavate the cutter head of the excavation unit by widening the pit wall of the shaft, thereby expanding the excavation range.

The side view of the shaft excavator which shows embodiment of this invention. Similarly sectional drawing of a shaft excavator. Similarly, a side view of the main frame. The top view of a main frame similarly. Sectional drawing of the support mechanism of the turning frame of a shaft excavator. The top view of the guide roller part in the support mechanism of a revolving frame similarly. The top view of the drive mechanism of a revolving frame similarly. The side view of the swing angle detection part of a swing boom. The side view of the rocking | swiveling angle detection part of an excavation unit. Explanatory drawing which shows the operation state of the excavation unit in the reference | standard position of a rocking boom. Explanatory drawing which shows the operation state of the excavation unit in the 1st position of a rocking boom. Explanatory drawing which shows the operation state of the excavation unit in the 2nd position of a rocking boom. Explanatory drawing which shows the operation state of the excavation unit in the 3rd position of a rocking boom. Explanatory drawing which shows the characteristic of the turning flow volume (A) with respect to the turning radius of a cutter head, tip speed (B), and turning pressure (C). The pressing force by the telescopic cylinder of the swing boom, the tip speed [mm / sec] of the cutter head, the supply pressure of the hydraulic oil supplied to the drive motor [MPa], and the amount of hydraulic oil supplied to the drive motor [L / min ] Is a pattern diagram showing set values.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

  The shaft excavator 1 to which the present invention is applied excavates a relatively large-diameter shaft having an inner diameter of 4.5 meters and a depth of 500 meters, for example.

  As shown in FIG. 1, the shaft excavator 1 is suspended and lowered in the shaft 2, and is fixed to the shaft wall of the shaft 2 by the gripper 10 and excavated in a state in which the central axis position coincides with the shaft 2. A main frame 3 having an opening for discharging soil through which earth and sand discharging means pass, a revolving frame 4 arranged to revolve around the central axis of the main frame 3 with respect to the main frame 3, and the revolving frame The base end is connected via a horizontal axis in the direction normal to the radial direction of the shaft 2 provided at the lower end of the shaft 4, and is arranged so as to be able to swing in the radial plane of the shaft 2 with respect to the turning frame 4. The base end of the swing boom 5 is connected to the swing boom 5 via a horizontal axis in the direction normal to the radial direction of the shaft 2 provided at the distal end of the swing boom 5. It is arranged so that it can swing in the direction plane, It comprises a drilling unit 6 to excavate the natural ground by rotating the cutter head 7 which is arranged in the end, the.

  As shown in FIGS. 3 and 4, the main frame 3 is arranged at equal intervals in the circumferential direction connecting the upper and lower ring frames 11 and 12 and the upper and lower ring frames 11 and 12 arranged vertically. A plurality (three in the illustrated example) of columnar members 13 and a turning guide portion 14 fixed to the lower ring frame 12 are integrally coupled by welding or the like. A hook 15 is fixed to the upper surface of the upper ring frame 11, and the main frame 3 is suspended by the suspension crane by engaging the tip of a suspension wire lowered from a suspension crane (not shown) with the hook 15. I am doing so. As described above, the main frame 3 is formed by connecting and combining the upper and lower ring frames 11 and 12 with the plurality (three) of the columnar members 13, so that the main frame 3 is configured by an annular skeleton structure as a whole. In addition to ensuring strength, the weight can be reduced, and the suspension weight of the suspension winch can be reduced.

  A receiving hole that extends in the radial direction of each of the ring frames 11 and 12 and opens on the outer peripheral side is provided at a portion where the upper and lower ring frames 11 and 12 and the columnar member 13 are connected. In each of the accommodation holes, an actuator 16 such as a hydraulic cylinder is built, and a gripper 10 that can be projected and retracted radially outward by the actuator 16 is disposed. Each gripper 10 is fixed so as to be swingable by a predetermined angle with respect to the actuator 16.

  Each gripper 10 is separated from the wall of the shaft 2 when the gripper 10 is positioned at a radially inward position by the actuator 16, and the main frame 3 can be moved up and down in the shaft 2 by a suspension crane (not shown). is there. Further, when each gripper 10 is positioned at an operation position where the gripper 10 is moved outward in the radial direction by the actuator 16, the gripper 10 swings along the shaft wall of the shaft 2 and comes into contact with the pressing force of the actuator 16, thereby It is possible to support the excavation reaction force and its own weight, which will be described later.

  As described above, since each gripper 10 is arranged at the connecting portion between the upper and lower ring frames 11, 12 and the columnar member 13 with which rigidity is ensured, the main frame 3 can be reliably secured to the well wall of the shaft 2 while ensuring the rigidity of the main frame 3. The main frame 3 can be supported.

  As shown in FIG. 5, the turning guide portion 14 includes an annular frame 14 </ b> A that is fixed to the lower portion of the lower ring frame 12 and configured in a ring shape. On the inner surface of the annular frame 14A, there are three guide rollers 17 disposed so as to be rotatable about a rotation shaft disposed in the vertical direction (vertical shaft direction) between the columnar members 13, and a guide roller 17 An annular rail surface 18 is provided that is disposed with its position shifted in the axial direction of the shaft 2 from the disposed portion, and is formed so as to face up and down. The three guide rollers 17 engage with the outer periphery of the ring member 21 provided at the base of the revolving frame 4 so as to be able to roll, and perform the positioning of the revolving frame 4 in the shaft 2 in the radial direction.

  As shown in FIGS. 5 and 6, the rotation shafts of the three guide rollers 17 are supported by blocks 19 whose radial positions can be adjusted by adjusting screws protruding inward from the annular frame 14A. In the state where the center of the ring member 21 provided at the base of the revolving frame 4 is aligned with the center of the main frame 3 (the shaft 2) by adjusting the position of the guide roller 17 with the adjusting screw, each block of each guide roller 17 19 is fixed to the annular frame 14A.

  The annular rail surface 18 is disposed so as to sandwich the swivel roller 22 provided so as to be rotatable about an axis disposed in the radial direction with respect to the base of the swivel frame 4 from above and below. By rolling and moving on the rail surface 18, the revolving frame 4 is positioned in the axial direction within the shaft 2. In this way, the base of the swivel frame 4 is rotatably supported with respect to the main frame 3 by the three guide rollers 17 and the swivel roller 22 that rolls on the annular rail surface 18. Compared with the case where a large bearing is used, the swivel frame 4 can be pivotably supported at a lower cost.

  As shown in FIG. 7, the ring member 21 provided at the base of the swivel frame 4 has a plurality of pins 23 fixed in the axial direction with a predetermined pitch interval in the circumferential direction. The upper and lower ends of each pin 23 are fixed and held by a pair of annular plates fixed to the ring member 21, and a pinion 26 that is rotationally driven by a drive motor 25 described later is engaged with a pin portion positioned between the pair of annular plates. . Three sets of the pinion 26 and the drive motor 25 are fixed to the lower ring frame 12 at an angular position corresponding to the three guide rollers 17.

  The drive motor 25 is constituted by a hydraulic motor, and rotates with its drive torque and drive speed controlled based on the hydraulic pressure and hydraulic oil amount supplied from the hydraulic unit 30 as a hydraulic source. Therefore, when the drive motor 25 is rotated, the ring member 21 is rotated by the engagement of the pinion 26 and the pin 23, and the swing frame 4 that is rotatably supported by the guide roller 17 and the swing roller 22 of the main frame 3 is rotated. It turns in the main frame 3.

  As shown in FIG. 2, a hydraulic unit 30 for supplying hydraulic oil to the drive motor 25, a hydraulic unit 30, and a swing boom 5 and excavation unit 6 described later are disposed on the lower ring frame 12 of the main frame 3. And a control panel 31 for controlling the swing angle and the like. Although not shown, the hydraulic unit 30 includes a hydraulic pump driven by an electric motor, a pressure control valve for controlling the pressure of hydraulic oil discharged from the hydraulic pump, and a flow rate control valve for controlling the supply flow rate of the discharged oil. The output values of these control valves are controlled by the control panel 31. The main frame 3 has one small-diameter wind pipe 33 for supplying outside air into the shaft 2 and two large-diameter winds for discharging the air in the shaft 2 in order to ventilate the shaft 2. A tube 34 is arranged.

  As shown in FIG. 2, the main frame 3 is vertically moved up and down by the arrangement of the revolving frame 4 and its drive motor 25, the hydraulic unit 30 and the control panel 31, and the large and small wind pipes 33 and 34. A space that penetrates and is also opened by the turning motion of the turning frame 4 can be formed. This space constitutes a soil discharge opening 60 through which the excavating means for excavated sediment passes.

  The swivel frame 4 is configured as an annular body that supports the ring member 21 and the three guide rollers 17 inside the swivel guide portion 14 of the main frame 3, and as shown in FIG. A part of the annular body protrudes below the main frame 3. The base end of the swing boom 5 is connected to the tip of the swing frame 4 that protrudes downward through a horizontal shaft arranged in the circumferential direction of the shaft 2, and the swing boom 5 is connected to the swing frame 4. On the other hand, it is swingably supported around the horizontal axis (in the radial direction of the shaft 2). In addition, the revolving frame 4 and the swing boom 5 are provided with a cylinder 35 that connects both ends, and the swing position of the swing boom 5 can be adjusted by extending and retracting the cylinder 35.

  As shown in FIG. 8, the swing position of the swing boom 5 is a plurality (three in the illustrated example) arranged on the swing frame 4 side so as to detect the tip position of the detection arm 36 provided on the swing boom 5. ) Of the proximity sensor 37 is detected and input to a control panel (not shown). In the illustrated example, three proximity sensors 37 are arranged, a reference position where none of the proximity sensors 37 is turned on, a first position where only one proximity sensor 37 is turned on, and two proximity sensors 37 are provided. The second position where the on-operation is performed and the third position where all the proximity sensors 37 are activated are detected. The detection of the swing position of the swing boom 5 is not limited to the detection by the proximity sensor 37 described above, and other detection means may be used.

  Although not shown in the drawing, the swing boom 5 is composed of a telescopic cylinder composed of a piston rod and a cylinder that are telescopic and prevented from rotating relative to each other around the shaft. Are connected to the revolving frame 4 side via a horizontal axis arranged in the circumferential direction. The telescopic cylinder functions to generate a pressing force of the cutter head 7 against the natural ground when excavating the natural ground with the cutter head 7 of the excavation unit 6 provided at the tip. The pressing force is generated by introducing hydraulic oil from the hydraulic unit 30 through a pressure control valve. The pressing force is controlled by controlling the pressure control valve from the control panel 31.

  A horizontal shaft arranged in the circumferential direction of the shaft 2 is provided on the tip side of the swing boom 5, and an excavation unit 6 described later is arranged around the horizontal axis (radial direction of the shaft 2) with respect to the swing boom 5. It is swingably supported. Moreover, the cylinder 38 which connects both ends to the swing boom 5 and the excavation unit 6 is provided, and the swing position of the excavation unit 6 can be adjusted by extending and contracting the cylinder 38. As shown in FIG. 9, the excavation unit 6 has a plurality of swing positions (three in the illustrated example) arranged on the swing boom 5 side so as to detect the tip position of the detection arm 39 provided on the excavation unit 6. Is detected and input to a control panel (not shown).

  In the illustrated example, three proximity sensors 40 are arranged, a reference position where none of the proximity sensors 40 is turned on, a first position where only one proximity sensor 40 is turned on, and two proximity sensors 40 are provided. The second position where the on-operation is performed and the third position where all the proximity sensors 40 are activated are detected. The detection of the swing position of the excavation unit 6 is not limited to the detection by the proximity sensor 40 described above, and other detection means may be used.

  The excavation unit 6 is configured to excavate natural ground by rotating a cutter head 7 disposed at the tip by an electric motor having a reduction gear (not shown). A spiral screw 41 is disposed on the outer periphery of the shaft behind the cutter head 7 and operates to discharge the earth and sand excavated by the cutter head 7 when the cutter head 7 drills a natural ground. Although the cutter head 7 is not shown, for example, as described in Japanese Patent Application Laid-Open No. 2002-348900, a large number of round-type picks are formed from the center of the lower surface of the truncated cone-shaped head body to the lower end of the outer peripheral surface. For example, the spiral arrangement is provided in two rows symmetrically with respect to each other. Each pick has a conical head portion, a collar portion, and a cylindrical fixing portion, and is fixed to the head body using a pick box that holds the fixing portion.

  Since the excavation unit 6 has such a structure, the rotation of the excavation motor is decelerated and rotated by the reduction gear, so that there is no torque fluctuation or sudden rotation stop as in the case of rotation using hydraulic pressure. . Further, by rotating the cutter head 7, it is possible to excavate so as to dig a hole vertically, and by rotating the swing frame 4, the ground of the shaft 2 can be continuously excavated in a circular shape. Further, by swinging the swing boom 5 and the excavation unit 6, the radius position for continuous excavation in the circular shape can be changed, and the excavation range can be widened for continuous excavation.

  That is, when the swing boom 5 and the excavation unit 6 are set as the reference positions, the cutter head 7 of the excavation unit 6 is positioned at the center of the shaft 2 as shown by A in FIG. When 5 is extended, it operates to advance to the B position. When the swing boom 5 is set to the second position parallel to the center of the shaft 2 and the excavation unit 6 is set to the first position, the cutter head 7 of the excavation unit 6 is as shown in FIG. When reaching the pit wall of the shaft 2 and turning them by the turning frame 4, a groove can be excavated along the pit wall of the shaft 2.

  FIG. 10 is an example of a case where the shaft 2 has a diameter of 4.5 meters. The excavation unit 6 is changed from the reference position to the third position with the swinging boom 5 as the reference position. FIG. 11 shows the posture change of the excavation unit 6 when the swing boom 5 is similarly set to the first position and the excavation unit 6 is changed from the reference position to the third position. FIG. 12 shows the posture change of the excavation unit 6 when the excavation unit 6 is changed from the reference position to the third position with the swing boom 5 in the second position, and FIG. The attitude | position change of the excavation unit 6 when changing the excavation unit 6 from a reference position to a 3rd position by making the dynamic boom 5 into the 3rd position is shown.

  Therefore, when the swing boom 5 is the first position and the excavation unit 6 is the third position, when the swing boom 5 is the second position and the excavation unit 6 is the second position or more, the swing boom 5 is the third position. When the position and the excavation unit 6 are set to the first position or more, it is possible to excavate beyond the pit wall dimensions (for example, 4.5 meters in diameter) of the shaft 2, and the pit wall is partially widened (for example, (Diameter 7.5 meters).

  In addition to the above-described equipment, the swivel frame 4 is equipped with, for example, a shaft loader 50 that rakes up the earth and sand excavated by the excavation unit 6 and loads the earth and sand into the discharge bucket. It is carried out to the outside of the shaft 2 through the opening 60 for discharging and discharging the main frame 3. Further, as shown in FIG. 1, the pit wall of the vertical shaft 2 is formed into a concrete wall sequentially by pouring and hardening the concrete into the space formed by the mold 61.

  The case where the ground excavation of the shaft 2 is excavated by the shaft excavator 1 described above will be described below.

  First, the main frame 3 suspended in the shaft 2 by the hanging crane is positioned in the shaft 2 at the axial position where the cutter head 7 at the tip of the excavation unit 6 located below is close to the ground of the shaft 2. To do. Then, the gripper 10 of the main frame 3 is advanced by the actuator 16 so that the main frame 3 is fixed in the shaft 2.

  First, in order for the cutter head 7 of the excavation unit 6 to turn along the wall of the shaft 2 by the control panel 31, the swing boom 5 that approximates the diameter of the shaft 2 (for example, a diameter of 4.5 meters) is provided. The third position is the excavation unit 6 as the reference position. Next, the cutter head 7 is rotated in the shaft 2 by rotating the electric motor of the excavation unit 6 to rotate the cutter head 7 and simultaneously supplying hydraulic oil controlled to a predetermined pressure to the telescopic cylinder of the swing boom 5 and extending it. Excavation of the natural ground is started by pressing the natural ground close to the pit wall with a predetermined pressing force.

  When the cutter head 7 of the excavation unit 6 reaches a state where the excavation unit 6 has been excavated by a predetermined depth due to the extension of the telescopic cylinder of the swing boom 5, the hydraulic oil from the hydraulic unit 30 is supplied to the hydraulic control valve and the flow rate control. The valve is supplied to the drive motor 25 via the valve, the drive motor 25 is rotated, the turning frame 4 is turned, and the swing boom 5 and the excavation unit 6 are turned. The cutter head 7 is moved along the pit wall of the shaft 2 and sequentially excavates natural ground along the pit wall.

  The supply pressure and supply flow rate of the hydraulic oil to the drive motor 25 at this time are controlled according to the turning radius of the cutter head 7 as shown in FIGS. That is, as shown in FIG. 14A, the supply flow rate decreases as the turning radius of the cutter head 7 increases, and the supply flow rate increases as the turning radius decreases. As shown in FIG. The speed with respect to 7 ground is controlled to be substantially constant. On the other hand, as shown in FIG. 14C, the supply pressure of the hydraulic oil supplied to the drive motor 25 is controlled so as to decrease as the turning radius of the cutter head 7 decreases and increase as the turning radius increases. Is done.

  When the turning frame 4, the swinging boom 5, and the excavation unit 6 make one turn, a groove along the pit wall is formed in the natural ground over the entire circumference. Next, while the rocking angle of the rocking boom 5 or the excavation unit 6 is decreased by one step, the natural ground is excavated to the inner peripheral side by the cutter head 7 of the excavation unit 6, and the swivel frame 4 is similarly swiveled. The swing boom 5 and the excavation unit 6 are turned. The natural ground is sequentially excavated by the cutter head 7 on the inner peripheral side of the excavated circumferential groove. Thereafter, the entire region of the ground of the shaft 2 can be excavated by sequentially moving the position of the cutter head 7 toward the inner peripheral side while continuing the turning.

  Control of the supply pressure and supply flow rate of the hydraulic oil to the drive motor 25 is set in accordance with the turning radius of the cutter head 7 as shown in FIGS. 14 (A) and 14 (C). As shown, it may be set in advance according to a combination pattern of detection signals from the proximity sensor that detects the swing angle of the swing boom and the excavation unit 6.

  That is, the pressing force [KN] by the telescopic cylinder of the swing boom 5 and the cutter head 7 with respect to 16 patterns of combinations of the detection angles 0 to 3 of the turning boom and the detection angles 0 to 3 of the excavation unit 6. The tip speed [mm / sec], the hydraulic oil supply pressure [MPa] supplied to the drive motor 25, and the hydraulic oil amount [L / min] supplied to the drive motor 25 are set in advance. .

  Also in this case, the cutter head 7 is made to have a small turning angle according to the excavation radius of the cutter head 7 in the shaft 2 according to the swing angle position of the swing boom 5 and the excavation unit 6. 7 is controlled to be within a certain range.

  Further, the driving force in the turning direction of the turning frame 4 is largely controlled in accordance with the moving radius of the cutter head 7, and the product of the moving speed of the cutter head 7 and the driving force in the moving direction is multiplied. However, regardless of the moving radius, the cutter head 7 is moved by a uniform driving force and moving speed in the moving direction. The set numerical values described can be variously changed according to the hardness of the natural ground, the arm lengths of the swinging boom 5 and the excavating unit 6, the turning radius of the turning frame 4, and the like.

  Thus, the control can be simplified by setting in advance according to the combination pattern of the detection signals from the proximity sensors 37 and 40 that detect the swing angles of the swing boom 5 and the excavation unit 6. The set value can be easily changed according to the hardness of the mountain.

  In this embodiment, it is suspended in the shaft 2, descends, is fixed to the shaft wall in a state in which the central position coincides with the shaft 2, and the soil discharge carrying opening 60 through which the excavating means for excavated soil passes. A main frame 3, a revolving frame 4 arranged to revolve around the central axis of the main frame 3 and driven to revolve, and a shaft 2 provided at the lower end of the revolving frame 4. A swing boom 5 whose base end is connected to a horizontal axis in a direction normal to the radial direction of the shaft and is swingable in a radial plane of the shaft 2 with respect to the swing frame 4, and the swing boom The base end is connected to a horizontal axis in a direction normal to the radial direction of the shaft 2 provided at the tip of the shaft 5, and is disposed so as to be able to swing in the radial plane of the shaft 2 with respect to the swinging boom 5. Turn the cutter head 7 placed at the tip It is provided with a drilling unit 6 to excavate the natural ground, the by.

  For this reason, the excavation unit 6 can be swiveled in the shaft 2 by the revolving frame 4, and the natural ground in the vertical shaft 2 can be excavated by the cutter head 7 of the excavation unit 6. Further, by sequentially setting the excavation radius by the cutter head 7 in the shaft 2 in accordance with the swing angle positions of the swing boom 5 and the excavation unit 6, it is possible to excavate the entire ground area of the shaft 2. At the same time, the cutter head 7 of the excavation unit 6 can also be excavated with the pit wall 2 widened by increasing the excavation radius by selecting the swing angle position of the swing boom 5 and the excavation unit 6. The range can be expanded.

  The main frame 3 includes a ring-shaped upper ring frame 11 and a lower ring frame 12 that are arranged vertically, and a plurality of columnar members 13 that are arranged at equal intervals in the circumferential direction that connect the upper and lower ring frames 11 and 12. A gripper 10 that protrudes from the upper and lower regions of each columnar member 13 to the outer region and abuts against the wall of the shaft 2 to fix the main frame 3 in the shaft 2, and a turning guide that holds the turning frame 4 in a turnable manner. Therefore, the overall strength of the annular skeleton structure can be ensured and the weight can be reduced, and the suspension weight of the suspension winch can be reduced.

  Further, the turning guide portion 14 is rotated around a plurality of guide rollers 17 arranged to be able to roll on the outer periphery of the base portion of the turning frame 4 formed in an annular shape, and an axis extending radially from the base portion of the turning frame 4. A plurality of swiveling rollers 22 and a pair of annular rail members 18 that are engaged with both sides of the swiveling roller 22 in the shaft direction, so that a large-diameter bearing that is expensive and heavy is used. It is possible to realize light weight and low price.

  Further, the turning drive of the turning frame 4 includes a ring gear fixed to the turning frame 4, a pinion 26 that meshes with the ring gear, and a drive motor 25 that drives the pinion 26, and the ring gear has an annular shape. A plurality of pins 23 are fixedly arranged in the axial direction with a predetermined pitch interval in the circumferential direction of the formed ring member 21, and the pinion 26 engages with the pins 23 arranged on the ring member 21. Since the ring member 21 is rotationally driven, the structure can be simplified and the weight can be reduced as compared with the case where a large ring gear is used.

  Further, the turning drive of the turning frame 4 is performed by the hydraulic drive motor 25 mounted on the main frame 3 and the hydraulic drive motor 25 so as to rotationally drive the pinion 26 that meshes with the ring gear fixed to the turning frame 4. Since the hydraulic oil source unit 30 is mounted on the main frame 3 so as to supply the hydraulic oil, the excavation unit 6 can be provided by the revolving frame 4 only by supplying electric power for operating the hydraulic power source unit 30 from the outside. Can be swiveled within the shaft 2.

  The present invention is not limited to the above-described embodiment, and it is obvious that various modifications can be made within the scope of the technical idea.

DESCRIPTION OF SYMBOLS 1 Vertical shaft excavator 2 Vertical shaft 3 Main frame 4 Turning frame 5 Swing boom 6 Excavation unit 7 Cutter head 10 Gripper 11 Upper ring frame 12 Lower ring frame 13 Columnar member 14 Turning guide part

Claims (5)

A main frame that is suspended in the shaft and descends, is fixed to the shaft wall in a state where the shaft and the center position coincide with each other, and includes a discharge port for discharging soil through which the excavating means for excavated sediment passes.
A revolving frame that is arranged to revolve around the central axis of the main frame with respect to the main frame and is driven to revolve;
A swing that is provided at the lower end of the swivel frame and is connected to a horizontal axis that is normal to the radial direction of the vertical shaft, and is disposed so as to be swingable in the radial plane of the vertical shaft with respect to the swivel frame. The boom,
The base end is connected to a horizontal axis in a direction normal to the radial direction of the shaft provided at the tip of the swing boom, and is disposed so as to be swingable in the radial plane of the shaft with respect to the swing boom. A shaft excavator comprising: a drilling unit that rotates a cutter head disposed at a tip to excavate natural ground.   The main frame includes a ring-shaped upper ring frame and a lower ring frame arranged vertically, a plurality of columnar members arranged at equal intervals in the circumferential direction connecting the upper and lower ring frames, and upper and lower regions of each columnar member 2. A gripper that protrudes from the outer region to abut against the shaft wall of the shaft and fixes the main frame in the shaft, and a turning guide portion 14 that rotatably holds the turning frame. The shaft excavator described in 1. A plurality of guide rollers arranged so as to be able to roll on an outer periphery of a base of a turning frame formed in an annular shape;
A plurality of swivel rollers rotating about an axis extending in a radial direction from a base of the swivel frame;
The shaft excavator according to claim 1, wherein the shaft excavator is configured by a pair of annular rail members engaged with both sides of the swivel roller in the shaft direction. The turning drive of the turning frame is composed of a ring gear fixed to the turning frame, a pinion that meshes with the ring gear, and a drive motor that drives the pinion,
The ring gear is formed by fixing and arranging a plurality of pins in the axial direction with a predetermined pitch interval in the circumferential direction of a ring member formed in an annular shape,
The shaft excavator according to any one of claims 1 to 3, wherein the pinion engages with a pin disposed on the ring member to rotationally drive the ring member.   The swing drive of the swing frame is configured to supply hydraulic oil to the hydraulic drive motor mounted on the main frame and the hydraulic drive motor so as to rotationally drive a pinion that meshes with a ring gear fixed to the swing frame. The shaft excavator according to any one of claims 1 to 4, wherein the shaft excavator is mounted on a main frame and configured by a hydraulic power source unit.

Images