JP4471829B2 - Drilling rig - Google Patents

Description

  The present invention relates to an improvement of an excavating apparatus for propelling a pipe body into the ground while excavating the ground in front by a screw auger mounted inside the pipe body.

  Conventionally, as this type of excavator, for example, as described in Patent Document 1, a screw auger is mounted in a pipe body to be buried in the ground, and this screw auger is disposed on the start shaft side. 2. Description of the Related Art There is known an apparatus for excavating a front ground of a tubular body by rotating a front / rear moving carriage with a jack while being rotated by a rotational driving means installed on the front / rear moving carriage.

  In addition, as an example of using such an excavator, as described in Patent Document 2, when an underground structure serving as an underground passage is buried in the ground under a track or under a road, A tube row made of steel pipes having a rectangular cross section is buried at a position where the upper floor portion should be buried, and then the underground structure is propelled from the start shaft side so as to replace this tube row with the upper floor portion. It is being buried.

  Specifically, first, after excavating the start pit and the arrival mine on both sides of the underground structure buried design area, a screw auger is provided with an edge cutting plate on the upper surface and excavating the front ground inside A plurality of pipes with a rectangular cross section are placed on the upper floor of the underground structure in the ground between the start pit and the arrival pit, and are pushed and buried from the start pit side in parallel to form a pipe roof. The above-mentioned edge cutting plate is constructed by installing the underground structure in the starting pit, bringing the front end surface of the upper floor portion into contact with the rear end of the pipe roof, and propelling the underground structure while excavating the front ground of the underground structure. The pipe roof is pushed out along the lower surface of the edge cutting plate to the arrival pit side, and the underground structure is buried in the buried design area.

On the other hand, as another method for burying the underground structure, as described in Patent Document 3, a shorter length than the pipe body is provided on the front side of the upper floor portion of the underground structure having a blade edge at the front end. By arranging a plurality of pipes side by side and interposing a propulsion jack between the rear end face of each pipe and the front end face of the upper floor of the underground structure, and extending the rods of these propulsion jacks, The pipe body is excavated for a certain length while receiving the propulsion reaction force on the upper floor of the structure, and then the underground structure is advanced by the propulsion means such as the traction means or the propulsion jack and the propulsion jack is It is embedded in the ground for a certain length by contracting the rod. In this way, the underground structure is buried in the buried design area by alternately repeating the propulsion of the pipe body and the advancement of the underground structure.
Japanese Patent Publication No. 3-14994 JP-A 64-29597 JP-A-56-125597

  However, when a pipe body with a screw auger inside is propelled into the ground and buried in the ground while excavating the front ground with the screw auger, large-diameter gravel entered the open end of the pipe body. In this case, the gravel becomes clogged in the gap between the inner peripheral surface of the tube and the auger shaft of the screw auger, and cannot be conveyed backward by the spiral blade attached to the outer surface of the auger shaft. It becomes blocked by the large-diameter gravel, and further excavation becomes difficult.

  In this way, when the gravel is clogged at the open end of the tube during the propulsion and embedment of the tube, according to the excavator described in Patent Documents 1 and 2, the screw auger is pulled out to the start shaft side. After that, the worker enters the pipe body and performs crushing and removal processing of gravel, etc. After that, the screw auger is inserted into the pipe body and mounted again, and the pipe body can be promoted and buried. There is a problem that the work loss time becomes longer and the construction period becomes longer.

  On the other hand, when the tubular body is disposed in front of the upper floor portion of the underground structure via a propulsion jack as in the latter case, the screw auger in the tubular body can be pulled out rearward of the tubular body. Since there is no space, it is impossible to install a screw auger in the pipe body. For this reason, workers are entering the pipe body and excavating the ground in front of it, and the construction period is prolonged. In addition, when a large number of pipe bodies must be dug into the ground in a side-by-side state, there is a problem that work efficiency is further reduced.

  The present invention has been made in view of such problems, and the object of the present invention is to provide a large diameter gravel or the like in the front end of a tubular body that is excavating the front ground. Gravel removal work can be performed easily and reliably without pulling out the screw auger from the bottom, and when the underground structure is buried and constructed under the track or under the road, An object of the present invention is to provide an excavating apparatus capable of efficiently excavating the above-mentioned tubular body serving as a guide member for propulsion and burial.

  In order to achieve the above object, according to the excavator of the present invention, as described in claim 1, a screw auger in which a spiral blade is mounted on an outer peripheral surface of an auger shaft is disposed in a pipe body. The excavator is configured to excavate the front ground of the pipe body by propelling the pipe body into the ground while rotating the pipe, and to carry the excavated earth and sand backward by the spiral blades. The auger shaft front end is configured to be openable and closable from within the auger shaft.

  In the excavating apparatus configured as described above, the invention according to claim 2 is characterized in that a worker's doorway is provided in communication with each other at the tube wall rear end portion of the tubular body and the peripheral wall rear end portion of the auger shaft. It is said.

  Further, the screw auger rotational drive means is configured to detachably connect the front end of the rotational axis of the drive motor to the rear end central axis of the screw auger as described in claim 3. The propulsion means comprises a propulsion jack that pushes the rear end of the tube.

The invention according to claim 4 is characterized in that the excavator constructed as described above is employed in an underground structure that is propelled and buried under a track or under a road, and the front end of the underground structure While installing a blade edge in the opening, and arranging a plurality of pipe bodies that are internally arranged with a screw auger that constitutes a drilling device in front of the upper surface of the blade edge in front of the upper floor portion of the underground structure, A left and right movable carriage capable of reciprocating in the width direction of the underground structure is disposed on the blade edge between the rear end of the tubular body row and the upper floor of the underground structure, and the tubular body is disposed on the left and right movable carriage. A forward / backward moving carriage provided with a rotational driving means of the screw auger and a propelling means for propelling the tubular body by receiving the propulsive reaction force on the reaction wall on the front side of the upper floor portion of the underground structure is disposed.

  According to the first aspect of the present invention, by rotating the screw auger disposed inside the tube body and propelling the tube body into the ground, the earth and sand excavated by the screw auger and the outer peripheral surface of the auger shaft and the tube Of course, the auger of the screw auger disposed in the pipe body can be smoothly taken out backward by the spiral blades which are taken into the gap between the inner peripheral surfaces of the body and project from the outer periphery of the auger shaft. The shaft is formed of a hollow tube having a diameter that allows an operator to enter and exit, and the auger shaft front end of the screw auger is configured to be openable and closable from within the auger shaft. When a large-diameter gravel or the like is clogged in the front end of the tube body, the operator enters the hollow interior of the auger shaft and enters the front end of the auger shaft without pulling out the screw auger to open the front end of the auger shaft. Accordingly easily removed, such as the gravel, it is possible to perform a crushing operation. Therefore, the interruption of the tube propulsion and the burying work can be eliminated in a short time, and the propulsion burying work of the underground structure can be performed reliably and efficiently.

  According to the second aspect of the present invention, since the worker entrances and exits are provided in communication with each other at the tube wall rear end portion of the tubular body and the peripheral wall rear end portion of the auger shaft, Despite the fact that the tube propulsion means is disposed on the starting side behind the tube body, the rotation drive means and the propulsion jack are not obstructed at all, and therefore the rotation drive means and the propulsion are not disturbed. There is no need to remove the jack temporarily, and the auger shaft is connected to the inlet / outlet provided at the rear end of the pipe that is propelled and buried from the start side where the pipe is propelled / embedded. An operator can easily enter the auger shaft through the above-mentioned entrance / exit provided at the rear end of the tube, and can be easily moved to the start side after removing the gravel blocking the front end opening of the tube. You can leave.

  According to a third aspect of the present invention, the rotational drive means of the screw auger is constructed such that the front end of the rotational shaft of the drive motor is detachably connected to the central axis of the rear end of the screw auger. Since the means consists of a propulsion jack that pushes the rear end of the tube, the structure is simple and the excavation preparation work can be performed quickly, and the rotation axis of the drive motor is connected in series to the rotation center axis of the screw auger via a coupling or the like. And the propulsive force of the propulsion jack can be transmitted to the pipe body to smoothly dig the pipe body.

According to the invention of claim 4, a blade is attached to the front end opening of the underground structure to be propelled and buried under the track or the road, and the blade is positioned in front of the upper floor of the underground structure. A plurality of pipes with screw augers constituting the excavator are arranged in front of the surface, and the underground structure is placed on the blade edge between the rear end of the pipe row and the upper floor of the underground structure. A left and right movable carriage that can reciprocate in the width direction is arranged, and a propulsion reaction force is received on the left and right movable carriage by the screw auger rotational drive means in the pipe and the reaction wall on the front side of the upper floor of the underground structure. Since there is a forward and backward moving carriage provided with propulsion means for stopping and propelling the pipe body, there is no need to install rotation driving means and propulsion means on the blade edge corresponding to each pipe body , one single horizontal movement carriage by horizontal moving blade Prompt stopped at a predetermined tube rear, After a rotation driving means on the right and left movable carrier and connected to the rear end of the tube body of the screw auger, by extending the propulsion jacks is propulsion means, the tube sequentially, it is possible to efficiently excavation.

  At this time, each tube body can be propelled while rotating the screw auger by the rotation driving means in a state where the propulsion reaction force of the propulsion jack is reliably and firmly received by the front end surface of the upper floor portion of the underground structure. . Furthermore, since the auger shaft of the screw auger is formed from a hollow tube through which workers can enter and exit as described above, when the front end opening of the tube is clogged with large gravel, the rear end of the tube Since it can enter the auger shaft from the side and remove gravel and crushing work, the screw auger cannot be removed from the pipe body. It can be optimally used in the above-mentioned underground structure propulsion and burial methods. Can be carried out smoothly and efficiently.

  A specific embodiment of the present invention will be described with reference to the drawings. In FIGS. 1 and 2, an excavator A can freely rotate a screw auger 2 in a tubular body 1 made of a steel pipe having a rectangular cross section having a certain length. It arrange | positions, and it is comprised so that it may dig into the ground by propelling the pipe body 1 by the propulsion means 4 which consists of the propulsion jack 4a mentioned later, rotating this screw auger 2 with the rotation drive means 3 mentioned later. . As an example, the tube body 1 has a tube wall thickness of 19 mm and an outer diameter of 900 mm × 900 mm square, and the screw auger 2 disposed in the tube body 1 has a central axis. A certain auger shaft 2a is formed of a hollow tube having an inner diameter that allows an operator to enter and exit in a stomach-like state, for example, an inner diameter of about 50 mm.

  The screw auger 2 is integrally mounted with a spiral blade 2b for carrying out excavated earth and sand on the outer peripheral surface of the auger shaft 2a, and the spiral blade 2b is attached to the inner peripheral surface of the tube 1 and the outer periphery of the auger shaft 2a. The cutter head 2c is attached to the front end opening of the auger shaft 2a while being supported rotatably in the pipe body 1 in a state of protruding into the excavated sediment transport passage 5 formed by the gap between the surfaces. It will be.

  This cutter head 2c is formed as a conical full-closed head with the sharp tip side facing forward, and therefore prevents the earth and sand from entering the hollow interior of the auger shaft 2a. The conical outer peripheral surface of the header head 2c is provided with a spiral blade portion 2b ′ that is continuous with the spiral blade 2b, but a plurality of excavation bits are provided in place of the spiral blade portion 2b ′. Further, in the case of soil ground that can be cut open with its sharp tip, there is no need to provide a drill bit.

  Further, the cutter head 2c has a rear end surface formed to have the same diameter as the front end surface of the auger shaft 2a, and an appropriate position of the rear end portion is pivoted to the open end portion of the auger shaft 2a by a hinge 6. Are connected to the rear end portion of the cutter head 2c diametrically opposite to the hinge 6 and the opening end portion of the auger shaft 2a by an engagement fitting (not shown). Normally, the cutter head 2c is opened with the hinge 6 as a fulcrum as shown by the phantom line in FIG. It is configured to make it. It should be noted that the cutter head 2c is not formed in such a conical shape toward the front, but is formed in a vertical disk shape, and the disk portion can be opened and closed instead of the opening / closing means by the hinge 6. In short, the auger shaft front end can be opened and closed.

  In addition, outlets 8A and 8B through which workers can enter and exit are provided in communication with each other at the side wall portion at the rear end portion of the tube body 1 and the side wall portion at the rear end portion of the auger shaft 2a in the rotation stopped state. Note that doors (not shown) are provided at the doorways 8A and 8B so as to be freely opened and closed.

  The rear end opening of the auger shaft 2a is closed by a circular end face plate 2a1 whose outer peripheral edge is integrally fixed to the opening end face, and the rotation center shaft 10 is directed rearward at the center of the circular end face plate 2a1. The rear end of the rotation center shaft 10 and the front end of the rotation shaft of the rotation driving means 3 are detachably connected via a coupling 9. That is, one half 9a provided with a concave portion in the coupling 9 and the other half 9b provided with a convex portion that can be freely attached to and detached from this concave portion are connected to the rear end of the rotation center shaft 10 and the rotation driving means 3. It is fixed to the front end of the rotating shaft. The rotation drive means 3 includes a rotation drive motor 3a and a speed reducer 3b, transmits the rotation of the rotation drive motor 3a to the speed reducer 3b, and rotationally drives the rotation center shaft 10 via the speed reducer 3b. It is configured.

  The tube body 1 in which the auger shaft 2a is rotatably mounted is formed with a blade edge portion 1a whose front end edge is inclined obliquely rearward from the upper end toward the lower end, and the auger shaft 2a is formed in the blade edge portion 1a. The cutter head 2c faces forward, and a sediment discharge port 11 that opens downward is provided at the lower portion of the rear end of the pipe wall of the pipe body 1. Similarly to the auger shaft 2a, the rear end opening of the tube body 1 is closed by a circular end face plate 1b whose outer peripheral edge is integrally fixed to the open end face, and the central portion of the circular end face plate 1b. A bearing 12 is fixed to the bearing 12, and the rotation center shaft 10 of the auger shaft 2a is rotatably supported on the bearing 12.

  The rotation drive means 3 is installed on a front / rear moving carriage 17 disposed behind the tube 1 with the rotation shaft of the rotation drive motor 3a facing forward. The propulsion jacks 4a, 4a, which are propulsion means 4, are installed on the front portion in the front-rear direction, and the front end portions of these propulsion jacks 4a, 4a are erected and fixed on the front end portion of the front-rear moving carriage 17. The spreader 19 is connected to both ends of the fixed wall plate 18 and a propulsion force transmission member 19 is integrally formed between the front ends of the piston rods of the propulsion jacks 4a and 4a on the rear end side of the propulsion jacks 4a and 4a. The spreader 19 is brought into contact with the rear reaction force wall 7 by extending the piston rod, and the front and rear moving carriage 17 is moved forward.

  In order to excavate the front ground by the screw auger 2 built in the pipe body 1 by propelling the pipe body 1 into the ground from the start shaft C side by the excavating apparatus A configured in this way, After disposing the back-and-forth moving carriage 17 at the rear, the reaction force wall is provided with the spreader 19 at the rear end in contact with the rear wall surface of the start shaft C by extending the piston rods of the propulsion jacks 4a and 4a of the propulsion means 4 7, when the piston rod is further extended from this state, the forward / backward moving carriage 17 moves forward, and the rotation shaft of the rotational drive means 3 installed on the forward / backward movement carriage 17 is connected via the coupling 9. The screw auger 2 is directly connected to the rear end rotation center shaft 10.

  In this state, when the rotation drive motor 3a of the rotation drive means 3 is operated to rotate the screw auger 2 and the piston rods of the propulsion jacks 4a and 4a are further extended, the reaction force wall 7 supports the propulsion reaction force. However, the propulsive force is transmitted to the tubular body 1 supporting the rotation center shaft 10 of the screw auger 2, and the tubular body 1 is propelled while the forward and backward moving carriage 17 is advanced, and the cutting edge portion 1a of the tubular body 1 and The front ground is dug by the cutter head 2c constituting the front end of the screw auger 2. The excavated earth and sand are conveyed rearward by the rotation of the spiral blade 2b of the screw auger 2 through the earth and sand conveying path 5 between the inner peripheral surface of the tube body 1 and the outer peripheral surface of the auger shaft 2a. It is discharged into the start shaft C from the earth and sand carry-out port 11 opening downward.

  Thus, when the tubular body 1 is dug for a certain length, the piston rods of the propulsion jacks 4a, 4a are contracted, and then the thickness corresponding to the dug length of the tubular body 1 is between these piston rods and the reaction force wall 7. By extending the piston rod again by interposing the reaction force receiving member 7a, the tube body 1 is further excavated by a certain length, and by repeating this, the tube body 1 is propelled and buried in the ground over the entire length. However, when the open end of the excavation earth and sand transport passage 5 in the pipe body 1 is blocked by a large-diameter gravel during the excavation of the pipe body 1 or when the gravel is clogged in the open end, Then, the excavation by the screw auger 2 is stopped and the gravel is crushed and removed.

  This work is performed by the worker through the entrance 8A provided in the side wall portion at the rear end portion of the pipe wall of the pipe body 1 and the entrance 8B provided in the rear end portion of the peripheral wall of the auger shaft 2a from the start shaft C side. As shown in FIG. 3, the auger shaft 2a is moved to the front end portion of the auger shaft 2a, and the cutter head 2c is opened forward from the inside with the hinge 6 as a fulcrum. Since the cutter head 2c is a full-closed type, no excavation soil is taken into the auger shaft 2a even during excavation, so that an operator can easily enter the auger shaft 2a up to the cutter head 2c. .

  The cutter blade 2c is opened to crush the large-diameter gravel clogged at the open end of the excavation earth transport passage 5 between the front end of the tube 1 and the auger shaft 2a, and the spiral blade in the excavation earth transport passage 5 If there is a stone or the like that cannot be crushed by 2b, it is taken into the auger shaft 2a and removed backward through the auger shaft 2a. After crushing and removing large-diameter gravel, etc., the cutter head 2c is closed, and then the worker exits to the start shaft C side through the above-mentioned entrances 8A and 8B between the auger shaft 2a and the pipe body 1, and again this The screw auger 2 is driven while the tubular body 1 is being propelled to excavate the front ground. In addition, when the length of the pipe line by the pipe body 1 to be buried in the ground is long, the fixed-length pipe body 1 in which the auger shaft 2a is housed may be propelled and buried sequentially.

  4 to 9 show a case where an underground structure B that becomes an underground passage is buried and constructed in the ground under the track or under the road using the excavation apparatus A having the above-described configuration. As shown in FIG. 2, a blade edge 13 is attached to the front end opening. The cutting edge 13 is formed in a front rectangular frame shape composed of an upper frame portion 13a, both side wall plate portions 13b, 13b and a lower wall surface portion 13c, and is formed at the front end of both side wall plate portions 13b, 13b. The cutting edge is formed as an inclined cutting edge inclined obliquely rearward from the upper end to the lower end, and a support frame 14 provided integrally with the rear end face of the blade opening 13 is fixed to the opening front end of the underground structure B. Is. The upper frame portion 13a of the blade edge 13 is formed on the lower surface of the upper floor portion B1 of the underground structure B with the upper surface positioned downward by a dimension corresponding to the thickness of the upper floor portion B1 of the underground structure B. Both side wall plate portions 13b, 13b protrude horizontally from the height position and have a width between the side wall plate portions 13b, 13b of the upper frame portion 13a equal to the width of the underground structure B. The outer side surfaces of the basement structure B are continuously provided on both side outer surfaces of the underground structure B.

  Then, the lower surface of the rear end portion of the tubular body 1 made of a steel pipe having a rectangular cross section in the excavation apparatus A is placed on the front portion of the upper surface frame portion 13a of the blade edge 13, and a plurality of these tubular bodies 1 are arranged. As shown in FIG. 7, FIG. 8 and FIG. 8, the entire width of the upper surface frame portion 13a is arranged in the left-right direction, and the rear end surface of this tube row and the front end surface of the upper floor portion B1 of the underground structure B A rail 15 is laid in the width direction of the underground structure B on the top frame portion 13a of the blade edge 13 between the two, and a left and right movable carriage 16 is arranged on the rail 15 so as to be reciprocally movable. The front and rear moving carriage 17 is disposed on 16.

  Further, as shown in FIGS. 4 to 6, a tail roof plate 1c ′ having a fixed length is projected from the rear end to the rear end of the upper wall surface portion 1c of all the tubular bodies 1 as shown in FIGS. Yes. The tail roof plate 1c 'is formed so that the lower surface of the rear end portion extends from the upper end surface of the support frame 14 to the upper surface of the upper end portion B1 of the underground structure B, which is flush with the upper end surface. The tail roof plate 1c ′ supports the slidable support so that the soil on the upper ground collapses into the moving space 23 of the left and right moving carriage 16 between the tubular body 1 and the upper floor B1 of the underground structure B. To prevent you from doing. The width of the tail roof plate 1c 'is equal to or slightly wider than the width of the upper wall surface portion 1c of the tube body 1, and the opposite end surfaces of the tail roof plates 1c' and 1c 'of the adjacent tube bodies 1 and 1 are formed. They are joined to each other so as to be close to each other or slidable.

  A step portion corresponding to the thickness of the tail roof plate 1c ′ is provided on the upper surface of the front end portion of the upper floor portion B1 so that the upper surface of the tail roof plate 1c ′ and the upper surface of the upper floor portion B1 of the underground structure B are flush with each other. 24 is formed, and is supported by the step portion 24 so as to be slidable back and forth. The length of the stepped portion 24 is formed to be longer than the advancement length of each time the tube body 1 advances by the extension of the piston rod of the propulsion jacks 4a, 4a. Further, a reinforcing plate 25 having a width narrower than that of the tail roof plate 1c ′ is integrally fixed to the lower surface of the tail roof plate 1c ′ except for the rear end, and the rear lower surface of the reinforcing plate 25 is attached to the support frame 14. The tail roof plate 1c ′ is prevented from bending downward by supporting the support piece 26 projecting forward from the front side so as to slide forward and backward.

  As described above, the forward / backward moving carriage 17 is provided with the rotation driving means 3 of the screw auger 2 mounted in the tube body 1 at the center front portion thereof and the propulsion jack which is the propulsion means 4 on both sides. 4a, 4a are installed facing in the front-rear direction and the front ends of the propulsion jacks 4a, 4a are connected to both sides of the fixed wall plate 18 standing on the front end of the front-rear moving carriage 17. A spreader 19 is connected between the rear ends of the piston rods of the propulsion jacks 4a, 4a.

  Furthermore, as shown in FIG. 9, the front and rear end portions of the horizontal shaft 27 are supported on the lower surface of the spreader 19 while the stopper 22 is erected and fixed on the upper surface of the rear end portion of the left and right movable carriage 16. Brackets 28, 28 project downward, and the horizontal shaft 27 is inserted into the support hole 29 penetrating the upper end of the stopper 22 in the front-rear direction so as to be slidable back and forth, and the propulsion jack 4a When the piston rod 4a is extended, the spreader 19 contacts the support frame 14 (reaction force wall 7) before the front bracket 28 contacts the front end surface of the stopper 22, while the piston rods of the propulsion jacks 4a and 4a The rear bracket 28 comes into contact with the rear end surface of the stopper 22 and further prevents the piston rod from moving forward, and the piston rod contracts with the stopper 22 as a fulcrum to move back and forth. Configured to retract the dolly 17 To have.

  Further, as shown in FIG. 5, the left / right moving mechanism 21 of the left / right moving carriage 16 is fixed to a drive motor 21a mounted at the center of the rear end of the left / right moving carriage 16 and a rotating shaft of the drive motor 21a. And a rack 21c mounted horizontally in the lateral width direction of the underground structure B on the front surface of the upper end of the support frame 14 of the blade edge 13 in contact with the front end surface of the upper floor B1 of the underground structure B. The pinion 21b is meshed with the rack 21c, and the left and right movable carriage 16 is moved in the left and right direction along the front end surface of the upper floor B1 of the underground structure B by the rotation of the drive motor 21a. Yes.

  Since it was constituted in this way, in order to propel and embed the underground structure B installed on the start shaft C side so as to penetrate the reaching shaft side, first, a blade attached to the front end opening of the underground structure B The pipe bodies 1 arranged in parallel on the front part of the upper surface frame portion 13a of the mouth 13 are sequentially propelled, and the screw auger 2 is driven to rotate, and is buried in the ground while excavating the ground in front. Specifically, the left and right moving carriage 16 is moved to the rear of the desired tube 1 by operating the left and right moving mechanism 21 and stopped at that position, and then the piston rods of the propulsion jacks 4a and 4a are extended. To bring the spreader 19 at the rear end into contact with the front surface of the upper end of the support frame 14 superimposed on the front end surface of the upper floor B1 of the underground structure B, and further extend the piston rod using the support frame 14 as a reaction force wall 7 Then, the front / rear moving carriage 17 on the left / right moving carriage 16 moves forward, and the rotation axis of the rotary drive means 3 installed on the front / rear movement carriage 17 is connected to the center axis of rotation of the screw auger 2 via the coupling 9. Connect to 10.

  When the screw auger 2 is rotated by operating the rotation drive motor 3a of the rotation drive means 3 in this state and the piston rods of the propulsion jacks 4a and 4a are further extended, the underground structure B is opposed to the upper floor B1. The propulsive force is transmitted to the pipe body 1 supporting the rotation center shaft 10 of the screw auger 2 while supporting the propulsion reaction force via the support frame 14 which is the force wall 7, and the pipe body 1 is propelled. The front ground is dug by the front end cutter head 2c of the screw auger 2. The excavated earth and sand are conveyed rearward by the rotation of the spiral blade 2b of the screw auger 2 through the earth and sand conveying path 5 between the inner peripheral surface of the tube body 1 and the outer peripheral surface of the auger shaft 2a. It falls into the blade edge 13 from the earth and sand carry-out port 11 that opens downward.

  Thus, when one pipe body 1 is excavated for a certain length, the piston rods of the propulsion jacks 4a and 4a are contracted to retract the forward / backward moving carriage 17 so that the connection between the screw auger 2 and the rotation driving means 3 is released. . That is, when the piston rod contracts and its front end spreader 19 is separated from the support frame 14 by a small distance, the bracket 28 hanging from the rear end of the spreader 19 protrudes from the rear end of the left and right movable carriage 16 The front and rear moving carriage 17 is retracted by contraction of the piston rods of the propulsion jacks 4a and 4a with the stopper 22 as a fulcrum, and the rotational driving means 3 on the front and rear moving carriage 17 is moved. The coupling 9 between the rotating shaft and the rotating center shaft 10 of the screw auger 2 is released.

  After that, the left and right movable carriage 16 is moved to the rear of the next tube 1 and the piston rods of the propulsion jacks 4a and 4a are again extended in the same manner as described above, so that the spreader 19 is attached to the upper floor B1 of the underground structure B. The front end face is received through a support frame 14, and the piston rod is extended to advance the forward / backward moving carriage 17, whereby the rotation driving means 3 is connected to the rotation center shaft 10 of the screw auger 2 via the coupling 9. In this state, the screw auger 2 is rotated and the tube body 1 is propelled to advance the tube body 1 for a certain length.

  In the same manner, all the pipes 1 arranged in parallel are dug for a certain length by the operation of the rotary drive means 3 and the propulsion jacks 4a and 4a on the forward and backward moving carriage 17, and then the rear end face of the underground structure B And by extending the piston rods of a plurality of underground structure propulsion jacks 30 interposed between the rear wall surfaces of the start shaft C, the blades 13 attached to the front end surface of the underground structure B and the underground structure B While excavating the ground in front, the underground structure B is propelled into the ground by a length equal to the length of the tube row. The excavated sediment is discharged to the start shaft C through the underground structure B.

  When the underground structure B is buried, when the open end of the excavation earth and sand transport passage 5 in the pipe 1 is blocked by a large-diameter gravel during the excavation of the pipe 1, or the gravel or the like If it becomes clogged, the excavation by the screw auger 2 is stopped once, and the worker enters the space 23 on the blade edge 13 covered with the tail roof plate 1c 'of the tubular body 1 from the underground structure B side. Further, the front end portion of the auger shaft 2a enters the auger shaft 2a from the space 23 through the inlet / outlet 8A, 8B provided at the rear end portion of the tube body 1 and the hollow auger shaft 2a of the screw auger 2. As described in the above embodiment, the cutter head 2c is opened to crush and remove gravel. After that, the cutter head 2c is closed and retracted out of the tube body, and the screw auger 2 is driven while the tube body 1 is propelled to excavate the ground in front.

  As described above, all the pipes 1 by the operation of the rotation driving means 3 on the back and forth moving carriage 17 and the propulsion jacks 4a, 4a of the propulsion means 4 are sequentially excavated for a certain length, The underground structure B is buried under the track or under the road so as to cross the track or road by repeatedly performing the work of propelling the subsequent underground structure B by a length equal to the length of the tube row. Then, an underpass is constructed in which the opening portions at both ends are penetrated between the start side and the arrival side, that is, between both sides of the track and the road. In addition, when the length of the underground passage to be built by the underground structure B is long, the underground structure C having a length obtained by dividing the length of the underground passage into a plurality of lengths is sequentially promoted and buried while being connected. Just do it.

The simplified vertical side view of the state which has buried the pipe body in the ground while excavating the front ground. The top view which crossed a part of the excavator part. The simplified vertical side view of the state in which the worker has entered the hollow auger shaft. A simplified longitudinal side view when used for the promotion and burial of underground structures. The longitudinal side view of the principal part. The rear view. The partially abbreviate | omitted top view of the state which has embed | buried one pipe body horizontally. The simplified front view which shows the relationship between the pipe body and the underground structure which were paralleled. The side view of the stopper part provided in the rear-end side of a moving trolley | bogie.

Explanation of symbols

1 Tube 2 Screw auger
2a auger shaft
2b Spiral feather
2c Cutter head (Auger shaft front end)
3 Rotation drive means
3a Drive motor 4 Propulsion means
4a Propulsion jack 5 Excavation sediment transport passage
8A, 8B Doorway 9 Coupling
11 Sediment outlet

Claims (4)

  A screw auger with spiral blades attached to the outer peripheral surface of the auger shaft is arranged in the pipe body, and the pipe body is propelled into the ground while rotating the screw auger. In the excavator configured to carry out the earth and sand which is carried out backward by the spiral blade, the auger shaft is formed by a hollow tube having a diameter allowing an operator to enter and exit, and the front end of the auger shaft is opened and closed from within the auger shaft. A drilling rig characterized by being configured.   2. The excavator according to claim 1, wherein an entrance / exit of an operator is provided in communication with each other at a rear end portion of the tube wall of the tubular body and a rear end portion of the peripheral wall of the auger shaft.   The rotation driving means of the screw auger is configured to detachably connect the front end of the rotation shaft of the drive motor to the rear end central axis of the screw auger. The excavator according to claim 1, comprising a propulsion jack that pushes forward. A pipe body that has a blade edge attached to the front end opening of an underground structure to be propelled or buried under a track or road, and that has a screw auger in front of the upper surface of the blade edge in front of the upper floor of the underground structure. A plurality of the two side-by-side, and on the blade edge between the rear end of the tube row and the upper floor portion of the underground structure, a left and right movable carriage that can reciprocate in the width direction of the underground structure is disposed, A forward / backward movement provided with screw auger rotation driving means in the pipe body and propulsion means for propelling the pipe body by receiving the propulsion reaction force on the reaction force wall on the front side of the upper floor of the underground structure on the left and right moving carriage The excavator according to claim 1, 2 or 3, wherein a carriage is provided.

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