JP2008121356A - Boring machine and boring device using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a boring machine capable of drilling an underground hole having a rectangular section, and a boring device capable of minimizing bad effects on a tunnel shielding material with a relatively small required space within a tunnel. <P>SOLUTION: The boring device 20 forms a circular underground beam 12 in a natural ground 11 by propelling a rectangular sectional circular short pipe including a thrust transmission pipe provided with the boring machine at the tip from a start mouth 94 opened in a wall surface 10 located near the bottom of a tunnel T. A start frame 30 disposed in a position facing the start mouth 94 within the tunnel T includes a base pushing jack 22 for propelling the thrust transmission pipe from the start mouth 94 toward the natural ground 11, a guide rail and a guide roller for propelling the thrust transmission pipe toward the natural ground 11 along a preset curvature radius, and a retaining means for retaining the circular short pipe in a fixed attitude relative to the thrust transmission pipe. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an excavator and an excavator used in a widening work of a tunnel constructed in the ground or a tunnel connection work.

  In the case of tunnel widening work such as increasing the number of lanes by connecting some sections in the middle of the tunnel or the left and right middle part of the upper and lower single-line tunnels in existing shield tunnels or NATM (New Australian Tunneling Method) tunnels, It is necessary to form underground beams (supports) prior to widening excavation work in order to prevent collapse. For such tunnel widening work, various methods and devices have been proposed in the past. For example, Patent Document 1 discloses “Shield widening method and device” as described in Patent Document 1. .

  The widening method described in Patent Document 1 is a drilling device in which a curved pipe and an inner pipe provided with a movable shoe at the tip are pushed toward the periphery of the widened portion from the inside of the shield drilling hole, and attached to the tip of the inner pipe The excavator is digging while correcting the direction based on the propulsion position information measured by the position measuring device, and at the same time, the curved pipe is propelled to the excavation hole and embedded around the widened portion. Is.

  After the burial, the inner pipe is pulled out from the curved pipe together with the excavator while leaving the curved pipe, and the ground improvement injection pipe is inserted into the curved pipe to inject the improving agent. Widening work is carried out by improving the ground.

Japanese Patent Publication No. 7-76507

  The widening device described in Patent Document 1 is provided with reaction force support means for an inner pipe feed cylinder and a curved pipe feed cylinder in a portion of the tunnel wall surface facing the starting pit (see FIG. 1 of Patent Document 1). ), The occupied space is large, and the working space in the tunnel is narrowed.

  Further, since the curved pipe (cylindrical casing) and the inner pipe used in the widening method described in Patent Document 1 both have a circular cross section, if a cylindrical casing having a diameter necessary for widening work is to be adopted, As shown in FIG. 13 (b), a cylindrical casing 93 must be inserted into a circular start shaft opened by cutting the main girder 91 of the segment 90 shielding the tunnel wall surface. For this reason, there is a possibility of affecting the strength of the tunnel shield material.

  Therefore, as shown in FIG. 13 (a), the main girder 91 and the like of the segment 90 is not required to be cut, and the arcuate short pipe 52 having a rectangular cross section is inserted by excavating from a start well 94 having a rectangular cross section. If underground beams are formed, adverse effects on the tunnel shield material can be minimized. However, since the underground holes formed by the excavator (excavator) used in the invention described in Patent Document 1 are limited to those having a circular cross section, excavating the underground holes having a rectangular cross section. Is impossible.

  The problems to be solved by the present invention are an excavator capable of excavating a underground hole having a rectangular cross section, and a relatively small occupied space in the tunnel, minimizing adverse effects on the tunnel shield material. An object of the present invention is to provide an excavation device that can do this.

The excavator of the present invention is
A cylindrical casing having a rectangular cross section, a hydraulic drive motor arranged in the cylindrical casing, and arranged side by side in the long side direction of the cross section in the cylindrical casing while being rotated by the hydraulic drive motor A plurality of cutters disposed in front of the cylindrical casing in a state of being driven to rotate and revolve on the main shaft in order to form an underground pit into which the cylindrical casing can enter. A bit, and
The excavation is possible up to the corner of the rectangular cross section of the cylindrical casing by the plurality of cutter bits.

  With such a configuration, the section is arranged in front of the rectangular casing, and it is possible to excavate natural ground with a plurality of cutter bits that are rotated and revolved by a hydraulic drive motor. Underground holes can be excavated simultaneously on one side. In addition, the hydraulic drive motor and the two upper and lower main shafts that are rotationally driven by the hydraulic drive motor are disposed in a casing having a rectangular cross section, and thus are relatively small.

  Here, the length in the short side direction of the cross section of the cylindrical casing is made smaller than the arrangement interval of the tunnel main girder, etc., the section coefficient of the cylindrical casing is the diameter in the short side direction of the cylindrical casing cross section. It is desirable to be superior to a cylindrical casing having a circular cross section. With such a configuration, it is possible to open the start pit without cutting the main girder of the segment that shields the tunnel wall surface, and to dig the natural ground, thus reducing the adverse effects on the tunnel shield material can do.

  In addition, if the plurality of cutter bits are driven by the planetary gear driven by the rotation of the main shaft, it becomes possible to simultaneously rotate and revolve the plurality of cutter bits, and excavate a rectangular cross-section underground hole. Therefore, a relatively low driving force and high excavation accuracy can be maintained.

  Furthermore, if a water injection path having a muddy water inlet is provided in one of the main shafts and a muddy water path having a muddy water inlet is provided in the other main shaft, a water injection path having a muddy water inlet and a water discharge path having a muddy water inlet are provided. Since it is not necessary to separately provide the mud path in the cylindrical casing, there is a margin in the arrangement of the drive system member, the control system member, etc., and the limited space in the cylindrical casing can be used effectively.

  On the other hand, a water injection pipe that communicates with the water injection path, a waste mud pipe that communicates with the waste mud path, and a secondary flow pipe that communicates the water injection pipe and the waste mud pipe are provided. An opening / closing valve capable of adjusting the flow rate may be provided in each of the pipe and the side flow pipe. With such a configuration, it is possible to maintain an appropriate face pressure corresponding to the construction conditions (water pressure, ground collapse, soil particle configuration, etc.) by adjusting the opening of each opening / closing valve. Therefore, it is possible to prevent the collapse of natural ground during excavation work.

Next, the excavation apparatus of the present invention is
An excavation device that forms an arc-shaped underground beam in a natural ground by propelling an arc-shaped short pipe having a rectangular cross section into which the above-described excavating machine is inserted from a starting pit opened on a tunnel wall surface toward a natural ground,
In order to propel the excavator from the starting pit toward the ground, a suction means fixed at a position facing the starting pit, and the excavation along a predetermined curvature from the starting pit toward the ground. It is characterized by comprising guide means for propelling the machine and insertion means for connecting the arcuate short pipe behind the excavator.

  With such a configuration, there is no need to provide a reaction force member only in a portion of the tunnel wall surface that faces the start pit, so that the space occupied by the digging apparatus in the tunnel can be reduced. In addition, since it is possible to avoid the load caused by the reaction force of the attraction means concentrating only on the portion of the tunnel wall facing the starting pit, adverse effects on the tunnel shield material can be reduced. Furthermore, by making the cross-sectional shape of the arc-shaped short pipe rectangular so that it is not necessary to cut the main girder of the segment of the tunnel shield material, adverse effects on the existing tunnel shield material can be minimized.

  In this case, it is desirable that a thrust transmission pipe for transmitting the propulsive force of the attraction means to the excavator is connected to the rear of the excavator and disposed in the arcuate short pipe. With such a configuration, it is possible to avoid the thrust force of the suction means from being directly applied to the arcuate short pipe (steel pipe) left in the natural ground, thus causing deviation in the propulsion direction and rolling due to uneven load Can be prevented. Moreover, since the deformation | transformation and damage of the arc-shaped short pipe by an excessive load can also be avoided, a highly accurate underground beam can be formed.

  Further, if an angle adjusting means capable of changing the thrust angle of the thrust transmission pipe with respect to the starting pit is provided, the thrust angle of the thrust transmission pipe can be accurately adjusted and maintained not only at the start of excavation but also during excavation work. Therefore, a more accurate underground beam can be formed. In addition, since the propulsion angle can be set appropriately corresponding to the shape of the shield tunnel that has already been constructed, versatility is also enhanced.

  Further, if the suction means is used as a pressing means in the reverse direction and the excavator can be pulled out to the start well side, the pulling means installed on the start well side after the excavation work is completed in the reverse direction. Since the excavator and the thrust transmission pipe can be pulled back to the start pit side by pressing, the recovery operation becomes easy.

  On the other hand, as the attraction means, there are provided a plurality of jacks arranged around the arcuate short tube, and a measuring means capable of confirming the position and direction of the excavator by measuring the stroke of the jack. You can also. With such a configuration, the propulsion direction of the arc-shaped short pipe can be accurately grasped by measuring the strokes of a plurality of jacks with the respective measuring means, and more accurate posture control can be performed. Therefore, it is effective for improving the accuracy of underground beams.

  Further, the thrust transmission pipe is divided into two spaces parallel to the longitudinal direction, and pipes and wiring for excavation work such as a mud pipe, a mud pipe, an operation line and a hydraulic hose are inserted into one of the spaces. In addition, the other space may be a measurement space for measuring the position and direction of the thrust transmission tube. With such a configuration, it is possible to effectively use the two spaces in the thrust transmission tube. In addition, when the excavator and thrust transmission pipe are pulled back from the start pit after completion of the excavation work, the mud feeding pipe, mud pipe, operation line and hydraulic hose can be collected together, making the collection work easy. Become.

  INDUSTRIAL APPLICABILITY According to the present invention, an excavation machine capable of excavating an underground hole having a rectangular cross section, and an excavation apparatus that can occupy a relatively small space in the tunnel and minimize adverse effects on the tunnel shield material. And can be provided.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 is a partially omitted vertical sectional view showing a digging apparatus according to an embodiment of the present invention, FIG. 2 is a partially enlarged view of FIG. 1, and FIG. 3 is a side view of a propulsion gantry constituting the digging apparatus shown in FIG. 4 is a plan view of the propulsion gantry shown in FIG. 3, FIG. 5 is a front view of the propulsion gantry shown in FIG. 3, and FIG. 6 is a rear view of the propulsion gantry shown in FIG. 7 is a vertical sectional view showing the excavator, the thrust transmission pipe, and the arcuate short pipe constituting the excavation apparatus shown in FIG. 1, and FIG. 8 is a rear view of the thrust transmission pipe shown in FIG.

  As shown in FIGS. 1, 2, and 7, the excavation device 20 includes an excavator 50 at the tip from the start pit 94 opened on the wall surface 10 located near the bottom of the tunnel T toward the natural ground 11. The thrust transmission pipe 51 and the arc-shaped short pipe 52 having a rectangular cross section in which the thrust transmission pipe 51 is inserted are propelled to form an arc-shaped underground beam 12 in the ground 11. In the excavation device 20, a start stand 30 as shown in FIGS. 3 to 6 is arranged at a position facing the start well 94 in the tunnel T.

  The start frame 30 includes a main push jack 22 that is a pulling means for propelling the thrust transmission pipe 51 from the start pit 94 toward the ground 11, and a curvature set in advance from the start pit 94 toward the ground 11. A guide rail 23 and a guide roller 24 which are guide means for propelling the thrust transmission pipe 51 along R, and a support jack 25 which is a holding means for keeping the arc-shaped short pipe 52 in a fixed posture with respect to the thrust transmission pipe 51. It is equipped with. As shown in FIG. 2, the front portion of the start frame 30 is locked to the tunnel wall surface 10 around the start shaft 94 via the reaction force support portion 21, and the back surface portion of the start frame 30 and the wall surface 10 of the tunnel T. A support 29 is disposed between the two.

  The starting frame 30 includes a base frame 31 fixed to the wall surface 10 of the tunnel T, and a rectangular frame-shaped holding frame 33 attached to a horizontal support shaft 32 provided near the front surface of the base frame 31 so as to be tiltable. In order to change the inclination angle of the holding frame 33, an angle adjusting screw 34 for connecting the base frame 31 and the holding frame 33 is provided. On the front side of the holding frame 33, a plurality of outer pipe gripping jacks 35 that detachably hold the corners of the arc-shaped short pipe 52 are disposed, and on the inner periphery of the holding frame 33, four arc-shaped short pipes 52 are provided. A plurality of guide rollers 36 for sliding the outer peripheral surface are provided.

  The front end portion 22 a of the main push jack 22 is pivotally supported on the back side of the holding frame 33, and the operating portion 22 b is connected to an inner tube pressing tool 27 for pressing the thrust transmission tube 51. A plurality of grip jacks 26 for detachably holding the thrust transmission tube 51 are provided on the back side of the holding frame 33, and an outer tube for pressing the arc-shaped short tube 52 at the tip portion of the support jack 25. A pressing tool 28 is provided. When the main push jack 22 expands and contracts, the operating portion 22b reciprocates along the guide roller 24, whereby the inner tube pusher 27, the outer tube pusher 28, the support jack 25 and the like move in conjunction with each other. The tilt angle of the guide rail 23 can be changed by rotating the adjusting screw 37 screwed into the rear end portion of the guide rail 23.

  The plurality of main push jacks 22 arranged around the thrust transmission pipe 51 and the arcuate short pipe 52 are provided with measuring means (not shown) for measuring respective strokes. Therefore, by measuring the strokes of the plurality of main push jacks 22 with the respective measuring means, the propulsion direction of the arc-shaped short pipe 52 can be accurately grasped, and high-precision posture control can be performed.

  On the other hand, as shown in FIG. 7, the excavator 50 disposed at the tip of the thrust transmission tube 51 inserted in the arc-shaped short tube 52 includes a hydraulic drive motor 54 disposed in a cylindrical casing 53 having a rectangular cross section. The upper and lower main shafts 55a and 55b are rotationally driven by a hydraulic drive motor 54, and a plurality of cutter bits 56 are driven to rotate and revolve by the main shafts 55a and 55b, respectively. A water injection path 55ax having a muddy water inlet at the tip of the main shaft 55a is provided in the main shaft 55a, and a mud discharge path 55by having a mud outlet at the tip of the main shaft 55b is provided in the main shaft 55b.

  Further, in the cylindrical casing 53 on the back side of the excavator 50, a water injection pipe 60 that communicates with the water injection path 55ax and a mud discharge pipe 61 that communicates with the mud discharge path 55by are provided. The pipe 61 is provided with open / close valves 60b and 61b capable of adjusting the flow rate, respectively. Further, a subflow pipe 62 that communicates the water injection pipe 60 located on the upstream side of the on-off valve 60b and the drainage pipe 61 located on the downstream side of the on-off valve 61b is provided. 62b is provided. The open / close valves 60b, 61b, and 62b use rubber valves that operate by air pressure, but are not limited thereto.

  As shown in FIG. 8, the thrust transmission tube 51 is formed by two upper and lower cylindrical bodies 51a and 51b, and rectangular flanges 51f are fixed to both ends of the cylindrical bodies 51a and 51b arranged in parallel. By fixing the flanges 51 f of the adjacent thrust transmission pipes 51 with screws N, the thrust transmission pipes 51 can be connected. Further, as shown in FIG. 7, a plurality of hook-shaped slide members 51 c are attached to the outer periphery of the thrust transmission tube 51. These slide members 51c hold a constant distance between the outer peripheral surface of the thrust transmission tube 51 and the inner peripheral surface of the arc-shaped short tube 52, and slide the thrust transmission tube 51 along the inner peripheral surface of the arc-shaped short tube 52. It is a member for improving the slidability at the time of making.

  Here, FIG. 9 is a front view of the excavator shown in FIG. 7, FIG. 10 is a partially omitted sectional view taken along line AA in FIG. 7, and FIG. 11 is a partially omitted sectional view taken along line BB in FIG. 12 is a partially omitted sectional view taken along the line CC of FIG.

  As shown in FIG. 9, three cutter bits 56 that are rotationally driven by the main shafts 55a and 55b are arranged on the front surface of the excavator 50, respectively. As shown in FIG. 10, the plurality of cutter bits 56 are rotationally driven by planetary gears 57 driven by main shafts 55a and 55b, respectively. Accordingly, each cutter bit 56 rotates (revolves) around the main shafts 55a and 55b while rotating (spinning) around the respective support shaft 56a. Further, as shown in FIG. 10, a missing detection sensor 58 is provided.

  Further, as shown in FIG. 11, the main shafts 55a and 55b are rotationally driven by two gears 55ag and 55bg that mesh with a gear 54a that is rotated by a hydraulic drive motor 54 (see FIG. 7), respectively. Further, as shown in FIG. 12, a hydraulic drive motor 54 is disposed on the back side of the main shafts 55a and 55b, and a return position detection sensor 59 is provided.

  Next, based on FIGS. 13-20, the work procedure of the excavation construction using the excavation apparatus 20 and the excavation machine 50 is demonstrated. FIG. 13 is a view showing a shield tunnel wall surface near the start pit, FIGS. 14 to 19 are views showing an operating state of the excavation stand, and FIG. 20 is a vertical sectional view showing a state immediately after the excavation work is finished.

  As shown in FIG. 13 (a), a rectangular start pit 94 is opened between the main girders 91 of the segment 90 shielding the tunnel wall surface, and the position facing this start pit 94 is shown in FIGS. The illustrated excavation device 20 is arranged. At this time, the base frame 31 of the start frame 30 constituting the excavation device 20 is fixed to a part of the segment 90.

  As shown in FIG. 14, after holding the arc-shaped short pipe 52 with the thrust transmission pipe 51 provided with the excavator 50 at the tip inserted therein by the outer pipe holding jack 35, the support jack 25 is attached as shown in FIG. 15. The thrust transmission tube 51 is held in a fixed posture by the grip jack 26. Then, a bolt (not shown) for fixing the inner tube pressing tool 27 and the thrust transmission tube 51 is removed.

  Next, as shown in FIG. 16, the main pushing jack 22 is extended, a new thrust transmission pipe 51 is set, and the thrust transmission pipe 51 and the inner pipe pressing tool 27 are fixed with bolts (not shown). At this time, the arc-shaped short pipe 52 is supported only by the thrust transmission pipe 51.

  Next, as shown in FIG. 17, after the main push jack 22 is contracted and the distal end portion of the new thrust transmission tube 51 is brought into contact with the proximal end portion of the preceding thrust transmission tube 51, both are bolted (see FIG. 17). (Not shown). Then, the grip jack 26 is contracted to release the gripping force with respect to the preceding thrust transmission tube 51.

  Next, as shown in FIG. 18, the support jack 25 is extended, the distal end portion of the new arcuate short tube 52 is brought into contact with the proximal end portion of the preceding arcuate short tube 52, and both are tack welded. Thereafter, the outer tube holding jack 35 is contracted to release the holding force with respect to the preceding arcuate short tube 52.

  Next, as shown in FIG. 19, the main push jack 22 is contracted to propel the new thrust transmission pipe 51 toward the ground, and the joint S between the preceding arc-shaped short pipe 52 and the new arc-shaped short pipe 52 is obtained. Is exposed to the front side of the holding frame 33. Then, the welding is performed on the seam S to completely weld them.

  When such work is repeated, as shown in FIG. 20, the excavator 50 reaches the excavation end port 95 of the wall surface 10 of the tunnel, and the excavation work is completed. After that, if the excavator 50 and the thrust transmission pipe 51 are sequentially pulled out from the starting pit 94 side using the main push jack 22 on the pressing side, the connecting body of the plurality of arc-shaped short pipes 52 left in the natural ground is used. An arc-shaped underground beam 12 is formed. During the excavation work described above, if the gyrocompass 80 is arranged in the thrust transmission pipe 51 as shown in FIG. 21, more accurate posture control can be performed.

  As described above, in the excavator 50 of the present embodiment, the ground 11 is formed by the plurality of cutter bits 56 that are disposed in front of the cylindrical casing 53 having a rectangular cross section and are driven to rotate and revolve by the hydraulic drive motor 54. On the other hand, an underground hole having a rectangular cross section can be excavated simultaneously to one corner to the corner. In addition, the hydraulic drive motor 54 and the two upper and lower main shafts 55a and 55b that are rotationally driven by the hydraulic drive motor 54 are disposed in a cylindrical casing 53 having a rectangular cross section, and thus are relatively small. Furthermore, since the plurality of cutter bits 56 can be simultaneously rotated and revolved by the plurality of planetary gears 57 driven by the plurality of main shafts 55a and 55b, high excavation efficiency can be obtained.

  Moreover, as shown to Fig.13 (a), since the start pit 94 can be opened and the natural ground 11 can be excavated without cutting the main girder 91 etc. of the segment which has shielded the wall surface 10 of the tunnel T, etc. The adverse effect on the tunnel shield material can be reduced.

  Further, since the water injection path 55ax is provided in the main shaft 55a and the mud discharge path 55by is provided in the main shaft 55b, it is not necessary to separately provide the water injection path and the mud discharge path in the cylindrical casing 53, and the drive system member In addition, the arrangement of the control system members and the like is sufficient, and the limited space in the cylindrical casing 53 can be effectively utilized.

  On the other hand, by adjusting the opening degree of the on-off valves 60b, 61b, and 62b shown in FIG. 7, an appropriate face pressure corresponding to the construction conditions (water pressure, natural mountain disintegration, soil particle configuration, etc.) is maintained. Therefore, the collapse of the natural ground 11 during excavation work can be prevented.

  In addition, as shown in FIG. 2, the start frame 30 constituting the excavation device 20 of the present embodiment is fixed at a position facing the start pit 94 by the reaction force support portion 21 and the support body 29. It is not necessary to provide a reaction force member only in the portion of the wall surface 10 that faces the start pit 94, and the space occupied by the digging device 20 in the tunnel T can be reduced. In addition, since it is possible to avoid the load caused by the reaction force of the main push jack 22 as the pulling means from being concentrated only on the portion of the wall surface 10 of the tunnel T facing the start pit 94, the tunnel shield material can be avoided. The adverse effects of can be reduced.

  Further, since the cross-sectional shape of the arc-shaped short pipe 52 is rectangular, even when the arc-shaped short pipe 52 having an inner diameter necessary for widening work is adopted, as shown in FIG. Therefore, it is not necessary to cut the main girder 91 and the like, so that adverse effects on the tunnel shield material can be minimized. Further, by making the length in the short side direction of the cross section of the arc-shaped short tube 52 smaller than the arrangement interval of the main girders 91, the section coefficient of the arc-shaped short tube 52 is set to the length in the short side direction of the cross section of the arc-shaped short tube 52. It can be superior to the cylindrical casing 96 (see FIG. 13B) having a circular cross section with a diameter of. If the section modulus of the cylindrical casing is set to be approximately the same as that of the arcuate short tube 52, it is necessary to cut the main beam 91 and the like of the segment 90 as in the cylindrical casing 93 shown in FIG. Since the diameter is increased, the tunnel shield material is adversely affected.

  Further, since the thrust transmission pipe 51 for transmitting the propulsion force of the main push jack 22 to the excavator 50 is connected to the back side of the excavator 50 and disposed in the arc-shaped short pipe 52, it remains in the ground 11. It can be avoided that the propulsive force of the main push jack 22 is directly applied to the arc-shaped short pipe 52 to be formed. For this reason, the shift | offset | difference and rolling of the propulsion direction by an uneven load can be prevented. Moreover, since the deformation | transformation and damage of the arc-shaped short tube 52 by an excessive load can also be avoided, the highly accurate underground beam 12 can be formed.

  Further, as shown in FIG. 3, since the start stand 30 is provided with an angle adjusting screw 34 and an adjusting screw 37, the propulsion angle of the thrust transmission tube 51 can be accurately set not only at the start of excavation but also during the excavation work. Can be adjusted and maintained. For this reason, the highly accurate underground beam 12 can be formed. Moreover, since the propulsion angle can be set appropriately corresponding to the shape of the shield tunnel that has already been constructed, versatility is also good.

  Furthermore, since the excavator 50 can be pulled out together with the thrust transmission pipe 51 to the start pit 94 side using the main push jack 22 provided on the start stand 30 on the press side, the excavation work is completed, and then the start pit 94 side Since the excavator 50 and the thrust transmission pipe 51 can be pulled back to the start pit 94 side without providing another pulling means, the recovery operation is also easy.

  On the other hand, FIG. 21 is a partially omitted cross-sectional view taken along the line DD in FIG. 7, but as shown in the figure, the thrust transmission pipe 51 is formed by two upper and lower cylindrical bodies 51a and 51b. The internal space of the two cylindrical bodies 51a and 51b can be used effectively. For example, in the present embodiment, the gyro compass 80 is arranged in the cylindrical body 51a, but a traveling type measuring machine (not shown) that measures the propulsion direction can also be arranged. In addition, in addition to the water injection pipe 60 and the drainage pipe 61, the cylindrical body 51b has a hydraulic hose 40, 47 for driving the cutter, a hose 41 for the on-off valve, a hose 42 for the jet, a hydraulic drain hose 43, and a feed for the earth pressure sensor. A mud hose 44, a camera line 45, and a sensor line 46 are arranged.

  Therefore, as described above, after the excavation work is completed, when the excavator 50 and the thrust transmission pipe 51 are pulled back to the start pit 94 side, in addition to the water injection pipe 60 and the sludge pipe 61, operation lines (camera line 45, sensor line) 46)) and hydraulic hoses (cutter driving hydraulic hose 40, on-off valve hose 41, jet hose 42, hydraulic drain hose 43, earth pressure sensor mud hose 44, cutter driving hydraulic hose 47) And can be collected easily.

  Next, another embodiment relating to the excavator will be described with reference to FIG. FIG. 22 is a vertical sectional view showing an excavator according to another embodiment. In FIG. 22, the parts denoted by the same reference numerals as those shown in FIG. 7 are parts having the same structure and function as the constituent parts of the excavator 50 shown in FIG.

  As shown in FIG. 22, the excavator 70 includes two cylindrical casings 53 a and 53 b having a rectangular cross section, and includes a cylindrical casing 53 a disposed in front of the excavation direction, and a cylindrical casing 53 b disposed in the rear. A plurality of jacks 71 are arranged between the two. These jacks 71 are disposed at the four corners of the cylindrical casings 53a and 53b, and can extend and contract independently in the axial direction of the cylindrical casings 53a and 53b. Moreover, the partition wall 72 is provided in the front-end part of the cylindrical casing 53b facing the rear-end part of the cylindrical casing 53a.

  In the digging machine 70, the front end portion of the cylindrical casing 53a can be tilted up and down and left and right by extending and contracting each of the plurality of jacks 71, so that the digging direction can be finely corrected. For this reason, the digging direction of the digging machine 70 can be accurately adjusted and maintained even during the digging work, which is effective in forming the high-precision underground beam 12 (see FIG. 1). The functions of the other parts are the same as those of the excavator 50 shown in FIG.

  Next, based on FIGS. 23 to 27, tunnel connection work using the excavation apparatus according to the embodiment of the present invention will be described. FIG. 23 is a schematic diagram showing an outline of tunnel connection work using the excavation apparatus according to the embodiment of the present invention, FIG. 24 is a schematic diagram showing a construction site of the tunnel connection work shown in FIG. 23, and FIGS. It is a schematic diagram which shows the construction state of the tunnel connection construction shown in FIG.

  As shown in FIG. 23, the excavation device 20 and the start frame 30 are installed on the ceiling side in one of the two tunnels T1 and T2 existing in parallel, and according to the same work process as described above, The underground beam 12a is formed by digging from the ceiling of the wall surface 10b of the tunnel T2 toward the ceiling of the tunnel T1. Next, the excavation apparatus 20 and the start frame 30 are installed on the bottom side of the tunnel T1, and the underground beam 12b is formed by excavating from the bottom of the wall surface 10b of the tunnel T2 toward the bottom of the tunnel T1. Then, the opposite portions of the tunnels T1 and T2 between the underground beams 12a and 12b are removed, and the ground mountain 11 (see FIG. 24) in the opposite region is excavated to construct the bottom reinforcement structure 73 and the ceiling reinforcement structure 74. By doing so, the tunnels T1 and T2 can be connected.

  Hereinafter, based on FIGS. 24-27, the work process of the connection construction of tunnel T1, T2 is demonstrated. As shown in FIG. 24, when connecting the two tunnels T1 and T2, as shown in FIG. 25, the excavation device 20 and the start stand 30 are installed on the support body 75 formed in the tunnel T2. . And the underground beam 12a is formed by digging toward the ceiling part of the wall surface 10a of the tunnel T1 from the ceiling part of the wall surface 10b of the tunnel T2. Thereafter, the excavation device 20 and the start frame 30 are installed on a support (not shown) formed on the bottom side of the tunnel T1, and from the bottom of the wall surface 10b of the tunnel T2 toward the bottom of the wall surface 10a of the tunnel T1. The underground beam 12b is formed by digging.

  Next, as shown in FIG. 26, support members 76 and 77 are erected in the tunnels T1 and T2, respectively, and the facing portions of the tunnels T1 and T2 between the underground beams 12a and 12b are removed to form a facing region. A natural ground 11 is excavated. Then, as shown in FIG. 27, after the bottom portion reinforcing structure 73 and the ceiling portion reinforcing structure 74 are constructed, if the support members 76 and 77 are withdrawn, the connecting work of the tunnels T1 and T2 is completed. Thus, since the excavation apparatus 20 can also construct the connection construction of two tunnel T1, T2 which exists in parallel, it is excellent in versatility.

  The excavator and the excavator according to the present invention can be widely used in a widening work of a tunnel constructed in the ground or a connecting work of a tunnel.

It is a partially omitted vertical sectional view showing a digging apparatus according to an embodiment of the present invention. FIG. 2 is a partially enlarged view of FIG. 1. It is a side view of the propulsion frame which comprises the excavation apparatus shown in FIG. It is a top view of the propulsion frame shown in FIG. It is a front view of the propulsion frame shown in FIG. It is a rear view of the propulsion frame shown in FIG. It is a vertical sectional view showing the excavator, the thrust transmission pipe, and the arcuate short pipe that constitute the excavation apparatus shown in FIG. FIG. 8 is a rear view of the thrust transmission tube shown in FIG. 7. It is a front view of the excavator shown in FIG. FIG. 8 is a partially omitted cross-sectional view taken along line AA in FIG. 7. FIG. 8 is a partially omitted sectional view taken along line BB in FIG. 7. FIG. 8 is a partially omitted cross-sectional view taken along line CC in FIG. 7. It is a figure which shows the shield tunnel wall surface of the start pit vicinity. It is a figure which shows the operation state of an excavation stand. It is a figure which shows the operation state of an excavation stand. It is a figure which shows the operation state of an excavation stand. It is a figure which shows the operation state of an excavation stand. It is a figure which shows the operation state of an excavation stand. It is a figure which shows the operation state of an excavation stand. It is a vertical sectional view showing a state immediately after the end of the excavation work. FIG. 8 is a partially omitted cross-sectional view taken along line DD in FIG. 7. It is a vertical sectional view showing an excavator which is another embodiment. It is a schematic diagram which shows the outline of the tunnel connection construction using the excavation apparatus which is embodiment of this invention. It is a schematic diagram which shows the construction site of the tunnel connection construction shown in FIG. It is a schematic diagram which shows the construction state of the tunnel connection construction shown in FIG. It is a schematic diagram which shows the construction state of the tunnel connection construction shown in FIG. It is a schematic diagram which shows the construction state of the tunnel connection construction shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10,10a, 10b Wall surface 11 Ground mountain 12,12a, 12b Underground beam 20 Digging device 21 Reaction force support part 22 Moment push jack 22a Tip part 22b Actuation part 23 Guide rail 24,36 Guide roller 25 Support jack 26 Grip jack 27 Inner tube pusher 28 Outer tube pusher 29,75 Support 30 Start frame 31 Base frame 32 Horizontal support shaft 33 Holding frame 34 Angle adjustment screw 35 Outer tube grip jack 37 Adjustment screw 40 Cutter drive hydraulic hose 41 Hose for opening / closing valve 42 Jet Hose 43 Hydraulic Drain Hose 44 Earth Pressure Sensor Mud Hose 45 Camera Wire 46 Sensor Wire 47 Cutter Driven Hydraulic Hose 50, 70 Excavator 51 Thrust Transfer Pipe 51a, 51b Cylindrical Body 51c Slide Member 51f Flange 52 Arc Short Tube 53, 53a, 3b Cylindrical casing 54 Hydraulic drive motor 55a, 55b Main shaft 55ax Water injection path 55by Drainage path 56 Cutter bit 60 Water injection pipe 61 Drainage pipe 62 Substream pipe 60b, 61b, 62b Open / close valve 71 Jack 72 Bulkhead 73 Bottom reinforcement structure 74 Ceiling Reinforcement structure 76, 77 Support member 80 Gyrocompass T, T1, T2 Tunnel

Claims (11)

A cylindrical casing having a rectangular cross section, a hydraulic drive motor arranged in the cylindrical casing, and arranged side by side in the long side direction of the cross section in the cylindrical casing while being rotated by the hydraulic drive motor A plurality of cutters disposed in front of the cylindrical casing in a state of being driven to rotate and revolve on the main shaft in order to form an underground pit into which the cylindrical casing can enter. A bit, and
An excavation machine characterized in that excavation is possible up to a corner of a rectangular cross section of the cylindrical casing by a plurality of the cutter bits.   The length of the cylindrical casing section in the short side direction is made smaller than the arrangement interval of the tunnel main girder, etc., and the section coefficient of the cylindrical casing is a circle whose length is the length in the short side direction of the cylindrical casing section. The excavator according to claim 1, wherein the excavator is superior to a cylindrical casing having a cross section.   The excavator according to claim 1 or 2, wherein the plurality of cutter bits are driven by a planetary gear driven by rotation of the main shaft.   The excavation according to any one of claims 1 to 3, wherein a water injection path having a muddy water inlet is provided in one of the main shafts, and a water discharge path having a mud outlet is provided in the other main shaft. Machine.   A water injection pipe communicating with the water injection path, a drainage pipe communicating with the mud discharge path, and a subflow pipe communicating with the water injection pipe and the waste mud pipe, the water injection pipe, the waste mud pipe, and The excavator according to claim 4, wherein an opening / closing valve capable of adjusting a flow rate is provided in each of the secondary flow pipes. 6. An arc-shaped underground beam in which an arc-shaped short pipe having a rectangular cross-section in which the excavator according to any one of claims 1 to 5 is inserted is propelled from a starting pit opened in a tunnel wall surface toward a natural ground. A digging device that forms a
In order to propel the excavator from the starting pit toward the ground, a suction means fixed at a position facing the starting pit, and the excavation along a predetermined curvature from the starting pit toward the ground. A digging apparatus comprising: guidance means for propelling a machine; and insertion means for connecting the arcuate short pipe behind the digging machine.   The excavation apparatus according to claim 6, wherein a thrust transmission pipe for transmitting the propulsive force of the attraction means to the excavator is connected to the rear of the excavator and arranged in the arcuate short pipe.   8. The excavation apparatus according to claim 7, further comprising angle adjusting means capable of changing a propulsion angle of the thrust transmission pipe with respect to the start pit.   The excavation apparatus according to any one of claims 6 to 8, wherein the attraction means is used as a pressing means in the reverse direction, and the excavator can be pulled out toward the start pit side.   As the attraction means, a plurality of jacks arranged around the arcuate short tube, and a measuring means capable of confirming the position and direction of the excavator by measuring the stroke of the jack, respectively, are provided. The excavation apparatus according to any one of claims 6 to 9.   The thrust transmission pipe is partitioned into two spaces parallel to the longitudinal direction, and pipes and wiring for excavation work such as a mud pipe, a mud pipe, an operation line and a hydraulic hose are inserted into one of the spaces, The excavation device according to any one of claims 7 to 10, wherein the other space is a measurement space for measuring the position and direction of the thrust transmission tube.

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