JP2007239226A - Drift excavator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a drift excavator which can excavate a drift by propelling a pipe body simultaneously with excavation of the ground in front thereof by means of screw auger arranged in the pipe body, wherein the drift excavator facilitates removal of gravel and cobble stones present in the excavated ground in front thereof, and exchange of a cutter head etc. of the screw auger when they are damaged. <P>SOLUTION: According to the structure of the drift excavator, by arranging the screw auger 2 in the pipe body 1 having a longitudinally rectangular cross section, in a manner rotatable upward and downward, and moving the cutter head 2a protruding from a front edge of the pipe body 1, upward and downward, the entire area of the ground in front of the pipe body 1 is excavated. Then by suspending the screw auger 2 from a movable stand 6 that is movably arranged on a rail member 5 secured to a lower surface of an upper wall of the pipe body 1, and moving the movable stand 6 rearward, the screw auger 2 is temporarily retreated, and therefore removal of the gravel etc. and exchange of the cutter head etc. are achieved. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a horizontal hole excavating apparatus for excavating a horizontal hole having a vertically long cross section using a screw auger in the ground.

  Conventionally, when excavating a tunnel having a rectangular cross section using a screw auger, an apparatus for excavating the ground in front of the screw auger while swinging up and down and left and right has been adopted. For example, as described in Patent Document 1, a fixed portion of a cutter loader that is a rotation driving means of a screw auger is supported at a central portion of a partition wall in a tubular casing, and a proximal end portion of the screw auger is provided at a rotating portion of the cutter loader. By connecting the top and bottom of the screw auger so that they can be pivoted up and down by a jack, the front ground is excavated while swinging up and down and left and right in a state of protruding forward from the front end opening of the casing. Drilling rigs are known.

Further, as described in Patent Document 2, a swivel base that rotates in the left-right direction is disposed on the frame in the front end portion of the casing, and the rotation of the screw auger that is rotated up and down by a jack on the swivel base. By supporting the drive means in a freely rotatable manner and connecting the base end of the screw auger to the rotary drive means, the front end cutter head of the screw auger is projected forward, downward, left and right in the casing. An excavator that is configured to excavate the ground in front while being swung is also developed.
JP 58-44195 A Japanese Unexamined Patent Publication No. 1-318685

  However, in any of the above excavators, the rotation driving means of the screw auger is installed at a predetermined position in the casing, and it is difficult to remove and collect the screw auger that is rotationally driven by this rotation driving means to the rear. Therefore, when gravel, cobblestones, etc. exist in the excavation ground ahead, it is not possible to take measures such as removing them, and there is a possibility that excavation becomes impossible. Furthermore, during excavation, even when an excavation bit protruding from the cutter head is damaged, it is difficult to replace the excavation bit.

  The present invention has been made in view of such problems, and the object of the present invention is that when there is gravel or cobblestone in the excavation ground ahead during excavation of a horizontal hole, And cobblestones can be easily removed and excavation bits etc. can be easily replaced, and the excavation of the excavated earth and sand can be carried out efficiently while expelling the horizontal holes. It is in providing a horizontal hole drilling device.

  In order to achieve the above object, a horizontal hole excavating apparatus according to the present invention includes a screw auger for excavating the front ground of a tubular body having a rectangular cross section that is pushed forward by a propelling means. It is characterized by being arranged so as to be pivotable up and down and to be removable on the rear side of the tubular body.

  In the horizontal hole excavating apparatus configured as described above, the invention according to claim 2 suspends the auger support cylinder so as to be movable in the front-rear direction and move up and down in the pipe body, and the screw auger in the auger support cylinder. The base is inserted and connected to the rotational drive means disposed in the rear end of the auger support tube. Further, shafts are provided on both side surfaces of the auger support tube so that the shafts are connected to the tube body. The bearing body fixed to the inner surfaces of both side wall portions is configured to be fitted and supported so as to be detachable and rotatable in the vertical direction.

  Further, the invention according to claim 3 suspends the auger support cylinder in the pipe body so as to be movable in the front-rear direction, and inserts the base portion of the screw auger into the auger support cylinder in the rear end portion of the auger support cylinder. A forward / backward movement jack is mounted on the auger support cylinder to move the rotational drive means back and forth so that the tip cutter head of the screw auger protrudes and retracts from the front end opening of the tubular body. At the same time, a jack for vertically rotating the screw auger is detachably disposed between the auger support cylinder and the inner surface of the upper wall portion of the tubular body.

  According to a fourth aspect of the present invention, the tubular body has a rectangular shape in cross section, and a diameter of excavation by the screw auger is formed to be a diameter substantially equal to a lateral width of the longitudinal rectangular section of the tubular body, and in the front end portion of the tubular body On the bottom surface, an earth / sand containing lead-out housing that can accept the front part of the screw auger protruding from the auger support cylinder is disposed in a state inclined obliquely upward from the front end toward the rear end. It is characterized in that earth and sand discharging means is disposed from below the rear end outlet of the housing outlet housing toward the rear end of the pipe body.

  The invention according to claim 5 is characterized in that the front end surfaces of both side walls in the front end opening in the tubular body are formed on a convex arcuate front end surface along the vertical turning locus of the cutter head of the screw auger. In the invention according to claim 6, the earth and sand discharging means disposed on the inner bottom portion of the tubular body is constituted by a screw conveyor, and one end of the rear end portion of the tubular body is provided at the conveying terminal portion of the screw conveyor. The upper end part of the earth and sand discharge chute arrange | positioned in the lower part is connected, The discharge port of this earth and sand discharge chute is protruded outside from the one side lower part of a pipe body.

  According to the first aspect of the present invention, the screw auger for excavating the front ground of the tubular body can be pivoted up and down and removed to the rear side of the tubular body in the tubular section having a rectangular cross section pushed forward by the propulsion means. Therefore, when gravel, cobblestone, etc. exist in the excavation ground in front of the tube, the screw auger is removed rearward so that the operator can easily reach the front end opening of the tube through the tube. Therefore, the removal work such as gravel and cobblestone existing in the excavation ground can be surely performed, and further, the excavation bit protruding from the cutter head of the screw auger, etc. Even if the screw is damaged, the excavating bit can be easily replaced or repaired by removing the screw auger to the rear, and the horizontal hole can be reliably excavated to a predetermined length.

  According to a second aspect of the present invention, the auger support cylinder is suspended in the tube so as to be movable in the front-rear direction and can be moved up and down, and the base of the screw auger is inserted into the auger support cylinder. It is connected to the rotational drive means arranged in the rear end of the tube. Further, a shaft body is projected on both side surfaces of the auger support tube, and this shaft body is fixed to the inner surface of both side wall portions of the tube body. Since the auger support cylinder is suspended and fitted to and supported by the bearing body that is detachable and pivotable in the vertical direction, the shaft body that projects from both side surfaces of the auger support cylinder is tubular. By fitting and supporting the bearing body fixed to the inner surface of the both side wall portions of the auger from above, the auger support tube can be easily and rotatably disposed at an accurate position in the pipe body. The screw auger supported by the support tube Can be disposed in the excavation, predetermined position in front of the ground by the head.

  In this state, when the tube body is propelled while rotating the screw auger by the rotation driving means to excavate the ground in front, the propulsion reaction force at the time of excavation supports the shaft body from the shaft body. It is possible to dig smoothly while being surely received by the pipe via the. Further, by lifting the auger support cylinder, the shaft body can be easily detached from the bearing body and can be moved backward integrally with the screw auger from this state, and therefore exists in the excavation ground. Removal work such as gravel and cobblestone and excavation bit replacement work can be easily performed.

  Further, according to the invention of claim 3, since the auger support cylinder and the lower surface of the upper wall portion of the tubular body are connected by the jack for vertical rotation of the screw auger, both side surfaces of the auger support cylinder are connected by the shaft body. By extending and retracting the up and down rotation jack in a state where it is rotatably supported by the bearing body on the tube side, the tip cutter head of the screw auger is reciprocated in the vertical direction along the opening end of the tube body, The ground in front of the tube can be excavated reliably. In addition, since the jack for moving the rotational drive means of the screw auger back and forth is mounted on the auger support cylinder, the cutter head of the screw auger is protruded from the open end of the tubular body by extending the jack. The front ground can be excavated prior to the propulsion of the tube, and therefore, the tube can be propelled by inserting the open end of the tube into the excavation trace, and the tube is determined with a slight propulsive force. Can be dug accurately in the direction.

  According to the invention of claim 4, the cross-sectional shape of the tubular body is formed in a vertically long rectangular shape, and the excavating diameter by the screw auger is formed in a diameter substantially equal to the lateral width of the vertically long rectangular cross section of the tubular body. By simply rotating the screw auger up and down, the front ground at the open end of the tube can be excavated almost entirely efficiently, and in addition, it protrudes from the auger support tube on the inner bottom surface of the front end of the tube. Since the earth and sand containing lead-out housing that can accept the front part of the screw auger is inclined obliquely upward from the front end to the rear end, the earth and sand excavated by the tip cutter head of the screw auger is removed. The sediment can be intensively accumulated in the earth-and-sand containing lead-out housing, and the screw auger is rotated downward so that the front portion of the screw auger is placed in the earth-and-sand containing lead-out housing. The screw auger can smoothly and efficiently lead the earth and sand in the earth-and-sand containing lead-out housing to the rear, and further, the sand and sand from the lower side of the rear-end outlet of the earth-and-sand containing lead-out housing toward the rear end of the pipe body. Since the discharging means is provided, the excavated earth and sand can be reliably discharged toward the rear portion of the tubular body by the earth and sand discharging means.

  According to the fifth aspect of the present invention, the front end surfaces of the both side wall portions in the front end opening of the tubular body are formed on the convex arcuate front end surface along the vertical turning locus of the cutter head of the screw auger. The ground can be excavated while the auger cutter head is rotated up and down in a state where the cutter head of the auger always protrudes forward from the front end face of the tube, and the tube is smoothly and accurately oriented following the excavation. Can be promoted.

  Furthermore, according to the invention which concerns on Claim 6, the said earth-and-sand discharge means which discharges excavated earth and sand through the pipe body from the said earth-and-sand accommodation lead-out body arrange | positioned on the inner bottom face of the front-end part in a pipe body from a screw conveyor. The upper end of the earth and sand discharge chute arranged at the lower part on one side at the rear end of the pipe body is communicated with the conveying terminal end of the screw conveyor, and the discharge port of the earth and sand discharge chute is connected to the pipe body. Since it is made to project outward from the lower part of the side, the excavated earth and sand discharged from the earth and sand containing lead-out housing onto the front end of the screw auger can be smoothly and reliably delivered along the inner bottom surface of the pipe body by this screw auger. In addition, it can be carried out to the rear end portion of the pipe body and can be continuously and automatically discharged from the lower part of one side of the pipe body through the sediment discharge chute.

  And, this horizontal hole excavator is propelled under the track or under the road, and a plurality of them are placed in front of both side walls of the underground structure to be buried, and the discharge chutes are arranged in a stacked state with the discharge chute facing inward. By constructing to excavate the front ground on both side walls of the underground structure, the underground structure can be accurately propelled and buried in a predetermined direction, and the excavated earth and sand can be Can be discharged through the discharge chute to the front side of the front end opening of the underground structure and efficiently removed backward through the underground structure.

  FIG. 1 is a longitudinal side view of a main part of a horizontal hole excavating apparatus, FIG. 2 is a front view thereof, and FIGS. 3 and 4 are AA in FIG. 1 is a tube body made of a rectangular steel tube having a vertically long rectangular cross section having a certain length, and the tube body 1 is located at the center in the vertical direction in the front portion of the tube body 1. A screw auger 2 for excavating the ground in front through the front end opening is disposed so as to be pivotable up and down and to the rear side of the tube 1 so as to be removable from the rear end opening of the tube 1.

  This configuration will be described in more detail. The base portion of the screw auger 2 is a cylindrical auger support that is disposed at the center in the vertical direction in the front portion of the tube body 1 with its length direction directed in the front-rear direction. The base end of the auger shaft is detachably connected to the rotation shaft of the rotation driving means 4 which is inserted into the tube 3 and is provided in the rear end portion of the auger support tube 3. On the other hand, rail members 5 and 5 are fixed to the length portions from the front portion of the tubular body 1 to the rear end opening at both sides of the lower surface of the upper wall portion 1a of the tubular body 1. A movable table 6 is mounted so as to be movable back and forth, and both side surfaces of the central portion of the auger support tube 3 in the length direction can be moved up and down via chain blocks 7 and 7 which are lifting devices on both sides of the lower surface of the movable table 6. By suspending and supporting along the rail members 5 and 5 above, It is configured to move in the longitudinal direction of the glass support tube 3 in a state of suspended from carriage body 6.

  The auger support tube 3 is suspended in the longitudinal direction at the position where the screw auger 2, the auger support tube 3, the rotation drive unit 4, the forward / backward movement jack 8, which will be described later, and the support frame 10 are integrally provided. It is desirable to provide near the center of gravity position. By doing so, the excavating means A can be smoothly moved back and forth.

  Further, the base end surfaces of the jacks 8 and 8 for the vertical rotation of the screw auger 2 are rotatably and detachably connected to the lower surfaces of the rail members 5 and 5 above the rear side of the auger support tube 3. With the up-and-down turning jacks 8 and 8 inclined downward and obliquely forward, the tip of the rod is pivotally connected to both side surfaces of the rear end of the auger support tube 3 so that the up-and-down turning jacks 8 and 8 are connected. The screw auger 2 is configured to rotate up and down integrally with the auger support tube 3 by extending and contracting the rod.

  As shown in FIGS. 5 and 6, the vertical abutment fulcrum of the screw auger 2 includes shaft bodies 17, 17 projecting on both side surfaces of the auger support cylinder 3 in the vicinity of the center of gravity of the excavating means A, The tubular body 1 is composed of concave bearing bodies 18 and 18 which are fixed to the inner surfaces of both side wall portions 1b and 1b of the tubular body 1 and whose upper ends are open upward, and the shaft bodies 17 and 17 are bearing bodies from above. The auger support cylinder 3 is supported so as to be pivotable up and down and detachable upward by being inserted into 18 and 18 and received. In addition, excavation by the screw auger 2 is achieved by fitting the shaft bodies 17, 17 projecting on both side surfaces of the auger support cylinder 3 with the concave bearing bodies 18, 18 fixed to the inner surfaces of both side walls of the tube body 1. The propulsion reaction force of time is received. The bearing bodies 18 and 18 are fixed to positions at a distance substantially equal to the length of the screw auger 2 from the front end of the tube body 1 to the rear, and the auger support cylinder 3 is attached to the bearing bodies 18 and 18. When the shafts 17 and 17 projecting on both side surfaces are rotatably supported, the cutter head 2a of the screw auger 2 is positioned at the front end opening where the front ground of the tube 1 can be excavated. It is composed.

  Further, the rotational driving means 4 of the screw auger 2 is installed in the rear part of the auger support cylinder 3 so as to be movable back and forth, while a support frame 10 is projected rearward at the center of the rear end surface of the auger support cylinder 3. A forward / backward movement jack 9 of the screw auger 2 is attached to the support frame 10 in the front / rear direction, and the rod tip of the forward / backward movement jack 9 is connected to the rear end surface of the rotation driving means 4. The tip cutter head 2a of the screw auger 2 is configured to protrude and retract from the front end opening of the tube body 1 by expanding and contracting the rod.

  The tip cutter head 2a of the screw auger 2 is formed by projecting a cutter bit forward from the center of the tip of the screw auger 2 and the front end face of the screw projecting radially from the tip. The excavation diameter by 2a is formed to have a diameter approximately equal to the lateral width of the tube 1. Further, the front end surfaces of the side wall portions 1b and 1b facing each other in parallel at the front end opening of the tubular body 1 are projected with the same curvature along the vertical rotation trajectory of the tip cutter head 2a of the screw auger 2. It is formed on the arcuate front end face 1d.

  On the inner bottom surface of the front end portion of the tubular body 1, a sand storage / leading housing 11 having a U-shaped cross section is opened frontward on the lower wall portion 1 c in the front end opening portion of the tubular body 1. And, it is arranged and fixed in a state of being inclined obliquely upward from the front end toward the rear end opening. The earth-and-sand containing lead-out housing 11 is formed in a size that can receive the lower half of the front portion of the screw auger 2 and has an inner bottom surface that is arcuate along the lower peripheral portion of the screw of the screw auger 2. When the screw auger 2 is rotated downward at an inclination angle from the front end to the rear end and the lower half of the front portion is received in the earth-and-sand containing lead-out housing 11 Therefore, the lower half of the front portion of the screw auger 2 is received over the entire length of the earth-and-sand containing lead-out housing 11.

  Below the rear end outlet of the earth and sand containing lead-out housing 11 is disposed a front end portion of the earth and sand discharging means 12 comprising a casing 12a and a screw conveyor 12b rotatably arranged in the casing 12a. The earth and sand discharging means 12 is installed in a state of being gently inclined obliquely upward from the front end portion toward the rear end opening portion along the inner bottom surface of the lower wall portion 1c of the tubular body 1 and the casing 12a. The rear end of the rotating shaft of the screw conveyor 12b protruding rearward from the rear end is connected to a rotary drive motor 13 (shown in FIG. 7) disposed in the lower portion of the rear end of the tube body 1. The casing 12a of the earth and sand discharging means 12 opens at least the front end portion thereof upward, and the excavated earth and sand discharged from the rear end outlet of the earth and sand containing lead-out housing 11 is dropped into the front end portion of the casing 12a. It is configured as follows.

  Further, as shown in FIGS. 7 and 8, on the rear end side of the pipe body 1, the excavation that has been conveyed to the rear end portion of the casing 12 a in the earth and sand discharging means 12 and to the rear end portion of the screw conveyor 12 b. An opening 14 for discharging the earth and sand to the outside is provided, and the excavated earth and sand is discharged from the opening 14 to one side of the rear end of the tubular body 1 through the earth and sand discharge chute 15. The earth and sand discharge chute 15 is protruded in a state of being inclined obliquely downward from the inner opening end connected to and communicating with the opening 14 through the lower part on one side of the tubular body 1. Further, a propulsion means 16 consisting of several propulsion jacks is interposed between the rear end surface of the tube body 1 and a support wall surface provided behind the tube body 1, and the entire tube body is moved forward by the propulsion means 16. It is configured to promote.

  By excavating the front ground of the tubular body 1 with the screw auger 2 while propelling the tubular body 1 in the ground by the lateral hole excavating device configured in this way, a lateral hole of a predetermined length is excavated on the planned line in the ground. To do this, first, the base of the screw auger 2 is attached to the moving base 6 mounted on the rail members 5 and 5 fixed to the lower surface of the upper wall portion 1a of the tube body 1 so as to be movable back and forth via the chain blocks 7 and 7. The auger support cylinder 3 that supports the shaft is suspended, and in this state, the movable body 6 is advanced from the rear end side of the tube body 1 so as to protrude from both side surfaces of the auger support cylinder 3. The screw auger 2 is moved into the front part of the pipe body 1 so that the screw auger 2 is positioned directly above the bearing bodies 18 and 18 fixed to the inner surfaces of both side walls of the pipe body 1. The auger support cylinder 3 is lowered and the shaft bodies 17 and 17 can be freely rotated to the bearing bodies 18 and 18. It is fitted. Thereafter, the base end surfaces of the up and down pivoting jacks 8 and 8 are detachably fixed to the lower surfaces of the rail members 5 and 5, and the tip ends of the rods are inclined obliquely forward from the fixing portions downward. The auger support tube 3 is connected to the lower ends of both side portions on the rear end surface.

  In this state, the rotational drive means 4 of the screw auger 2 disposed in the rear part of the auger support cylinder 3 is operated to rotate the screw auger 2 and extend the rod of the forward / backward movement jack 9 to thereby increase the screw auger. 2 with the cutter head 2a projecting forward from the opening at the front end of the tube 1 and the rods of the above-described up-and-down pivoting jacks 8 and 8 being expanded and contracted, the auger support cylinder 3 is connected to the shaft body 17. The tube body 1 is rotated up and down around the fulcrum portion by fitting with the bearing body 18, and the cutter head 2 a of the screw auger 2 is reciprocated between the upper and lower ends of the open end of the tube body 1 in the up and down direction. Excavate the ground in front of the entire area.

  In this way, the ground in front of the tube 1 is excavated by rotating (swinging) the cutter head 2a of the screw auger 2 in the vertical direction with the cutter head 2a protruding forward from the front end opening of the tube 1. The tube body 1 is propelled by pushing the rear end face thereof by the propulsion means 16 to dig a horizontal hole. The propulsion reaction force acting on the cutter head 2a of the screw auger 2 during excavation is transmitted through the shaft body 17 of the auger support cylinder 3 and the bearing body 18 in which the shaft body 17 is fitted. 18 is received by the tube 1 to which 18 is fixed.

  The earth and sand excavated by the cutter head 2a of the screw auger 2 is taken into the front end opening of the earth and sand containing lead-out housing 11 and accommodated in the housing 11 and the screw auger 2 rotates to the lowest position. When the lower peripheral part of the front part is received in the earth-and-sand housing / leading frame 11, the inclination angle thereof coincides with the inclination angle of the earth / sand-containing / outer frame 11 and the front part of the screw auger 2 extends over the entire length. Therefore, the excavated sediment contained in the sediment storage / reduction housing 11 is smoothly moved to the rear end discharge port of the sediment storage / reduction housing 11 by the rotation of the screw auger 2. And it is conveyed reliably and falls in the front-end part of the casing 12a of the screw conveyor 12b which is the earth and sand discharge means 12 from this discharge port. Further, the excavated earth and sand that has fallen into the front end portion of the casing 12a of the earth and sand discharging means 12 is conveyed rearward by the rotation of the screw conveyor 12b that is the conveying means 16, and the earth and sand discharging chute is opened from the opening 14 at the lower rear end of the casing 12a. 15 is discharged to one side of the rear end of the tube 1.

  When excavation is difficult due to the presence of gravel, cobblestone, etc. in the front ground of the tube 1 during the excavation of the side hole, after the excavation of the front ground by the screw auger 2 is stopped, the auger support tube 3 and the lower surface of the rail members 5 and 5 are uncoupled, and the auger support cylinder 3 supports the auger support by the chain blocks 7 and 7 while the rear part of the screw auger 2 is supported by the auger support cylinder 3. The excavating means A including the cylinder 3 is lifted upward to disengage the shaft body 17 from the bearing body 18, and then the movable table 6 is moved backward while the auger support cylinder 3 is suspended via the chain blocks 7, 7. The screw auger 2 is removed to the rear of the tube body 1 by moving to the front end, and an operator enters the front end opening portion of the tube body 1 from the rear end opening portion of the tube body 1 to remove gravel, cobblestones, etc. After working, screw auger 2 The above-mentioned moving platform 6 that is suspended is moved to the original position along the rail members 5 and 5, the auger support cylinder 3 is lowered by the chain blocks 7 and 7, and the shaft bodies 17 and 17 are connected to the bearing bodies 18 and 18. 18 is fitted and received and connected to the auger support cylinder 3 and the upper rail members 5, 5, and the vertical pivot jacks 8, 8 are connected, and then the front ground of the tubular body 1 is excavated again.

  Even when the bit or the like of the cutter head 2a of the screw auger 2 is damaged, the screw auger 2 is removed to the rear of the tube 1 in the same manner as described above, and the bit is exchanged. May be moved to the original position in the tube 1 in the same manner as described above.

  As described above, when the tube body 1 is propelled while excavating the ground in front by the tip cutter head 2a of the screw auger 2, the propulsion jack as the propulsion means 16 is stretched so that the tube body 1 reaches the amount of extension. When propelled for a corresponding length, the excavation of the front ground by the screw auger 2 is temporarily interrupted, and the rod of the propulsion jack is contracted to have a thickness corresponding to the extension amount between the rod and the rear end surface of the tubular body 1. The spacer is interposed, and after that, excavation of the front ground of the pipe body 1 by the screw auger 2 and propulsion of the pipe body 1 by extension of the propulsion jack are performed again, and this operation is repeated, and a fixed length is placed on the planned line. It excavates a horizontal hole.

  When an underground structure is propelled and buried in the horizontal hole while excavating the horizontal hole with the horizontal hole excavator, a propulsion jack as the propulsion means 16 is attached to the front side of the underground structure. The screw auger 2 is rotated while the propulsion means 16 is extended to advance the ground in front of the tube body 1 for a fixed length. After the excavation, the screw auger 2 is stopped and the propulsion jack of the propulsion means 16 is contracted. The underground structure may be moved forward by a certain length, and this operation may be repeated to bury the underground structure at a predetermined position in the ground.

  FIGS. 9 to 11 use the horizontal hole excavator to propel the underground structure 20 having a rectangular cross section into the ground under the track or the road from the start shaft 30 toward the arrival shaft (not shown). FIG. 9 shows a case where an underground passage or the like is constructed by being buried and the underground structure 20 is constructed. As shown in FIG. 9, the underground structure 20 is provided with a blade 21 at a front end opening thereof. The horizontal upper frame portion 21a of the blade 21 has an upper surface positioned below the upper surface of the underground structure 20 by a dimension corresponding to the thickness of the underground structure 20, and is located above the front portion of the horizontal upper frame portion 21a. In addition, a bottom surface of a square tube 22 made of a steel pipe having a rectangular cross section and having a screw auger 23 rotatably mounted therein is supported slidably back and forth, and a plurality of these square tubes 22 are shown in FIG. As shown in FIG. 11, the front ground of the upper floor portion 20a of the underground structure 20 is excavated by this square tube array in parallel in the left-right direction.

  Further, a left and right movable carriage 24 is placed on the horizontal upper frame portion 21a of the blade edge 21 between the rear end surface of the square tube row and the front end surface of the upper floor portion 20a of the underground structure 20 on the upper floor portion 20a of the underground structure 20. Along with the front end face, the rotary drive means 25 can be moved back and forth by a jack or the like on the left and right movable carriage 24 and detachably attached to the rear end of the screw auger 23 in the square tube 22. is doing.

  Further, a tail roof plate 26 having a fixed length is projected from the rear end of the upper surface of all the square tubes 22 to the rear, and the lower surface of the rear end of the tail roof plate 26 is connected to the upper floor portion of the underground structure 20. These tail roof plate rows are supported slidably back and forth on the upper surface of the front end portion of 20a to prevent the upper ground from collapsing into the moving space portion of the left and right movable carriage 24. A discharge port 27 for discharging excavated earth and sand downward is opened on the lower surface of the rear end portion of the square tube 22.

  As shown in FIGS. 10 and 11, a plurality of the horizontal hole excavating devices are vertically arranged in front of the side wall portions 20b and 20b of the underground structure 20 (three in the figure) in a stacked state. These horizontal hole excavating devices are configured to excavate the front ground of both side walls 20b, 20b of the underground structure 20. The above-mentioned propulsion means 16 composed of a propulsion jack is interposed between the rear end surface of the tubular body 1 of each horizontal hole excavator and the front end surfaces of the both side walls 20b of the underground structure 20, and the rear end of the propulsion jack. Is connected to and supported by the front surface of both side frame portions 21b projecting outwardly of the blade edge 21 in contact with the front end surfaces of both side wall portions 20b of the underground structure 20, and the rod front end is connected to the rear of the tube 1 It is connected to a pressing plate 28 attached in contact with the end face. It should be noted that the earth and sand discharge chute 15 projecting to one side from the rear end portion of the tubular body 1 in all the horizontal hole excavating devices is in a state of being directed toward the blade edge 21 in front of the opening end of the underground structure 20. The tube bodies 1 are arranged in a row.

  Since it is configured in this way, in order to propel and bury the underground structure 20 installed on the start shaft 30 side so as to penetrate the reaching shaft side, first, it is arranged in parallel in front of the upper floor portion 20a of the underground structure 20 All the tubular bodies 1 of the horizontal hole excavating device arranged in front of all the square tubes 22 and both side walls 20b, 20b of the underground structure 20 are dug forward by a certain length. At this time, the excavation by the square tube 22 is performed by moving the left and right movable carriage 24 arranged on the horizontal upper frame portion 21a of the blade 21 to the rear end surface of the predetermined square pipe 22 and providing it on the carriage. The rotary drive means 25 is connected to the rear end of the screw auger 23 in the square tube 22, and the rotary drive means 25 is moved forward to advance the square pipe 22 while excavating the ground in front by the screw auger 23. Is done. After excavating the square tube 22 for a certain length, the left and right movable carriage 24 is moved to the rear of the next square tube 22 and the square tube 22 is excavated for a certain length in the same manner as described above. Go and excavate the tube column for a certain length.

  On the other hand, in order to dig up the vertically long rectangular pipe body 1 constituting the horizontal hole excavating apparatus disposed in front of the both side walls 20b, 20b of the underground structure 20, it is arranged in all the pipe bodies 1. As described above, the screw auger 2 is rotated up and down to excavate the front ground of the tube body 1 and the propulsion jack as the propulsion means 16 is extended to thereby extend the tube body 1 to the square tube 22. The same length as that. In this case, since the left and right movable carriage 24 can be disposed on the horizontal upper frame portion 21a of the blade 21 in the square tubes 22 arranged in parallel in the lateral direction, It is not necessary to provide a rotation driving means for the auger 23. However, in the case of the tubes 1 arranged in the vertical direction, a space provided with a movable carriage provided with the rotation driving means for the screw auger 2 so as to be movable in the vertical direction. Since it is difficult to provide a screw auger 2 in all the pipes 1 as described above, the screw auger 2 can be rotated in the vertical direction to reduce the number of pipes. The front ground of the both side walls 20b, 20b of the underground structure 20 is configured to be fully excavable with the number of one.

  The earth and sand excavated by the screw auger 23 in the square tube 22 falls into the blade edge 21 from the discharge port 27 opened on the lower surface of the rear end portion of each square tube 22, and similarly the screw in the tube 1 The earth and sand excavated by the auger 2 are discharged into the blade edge 21 through the earth and sand discharge chute 15 provided on one side surface of the rear end portion of the pipe body 1 as described above. The ground excavated earth and sand are removed to the start shaft 30 side through the underground structure 20.

  After pushing all the pipes 1 and the square pipes 22 into the ground for a certain length as described above, a plurality of underground pipes interposed between the rear end face of the underground structure 20 and the rear wall face of the starting shaft 30 By extending the structure propulsion jack 28, the underground structure is excavated by the cutting edge 21 attached to the front end surface of the underground structure 20 by a length equal to the digging length of the tube 1 and the square tube 22. Push object 20 into the ground. At this time, the propulsion jack which is the propulsion means 16 of the pipe body 1 is contracted according to the propulsion of the underground structure 20.

  Next, again, in the same manner as described above, the work for excavating the tube body 1 and the square tube row by a fixed length and the work for propelling the underground structure 20 by the same length after this work are performed, and the underground structure is repeated by repeating this operation. The underpass is constructed by connecting the front end of the object 20 to the reach shaft. The horizontal hole excavator and the square tube 22 etc. that have reached the reach shaft side are removed, recovered, and used for burying the next underground structure. In addition, when the length of the underground passage to be built by the underground structure 20 is long, the underground structure having a length obtained by dividing the length of the underground passage may be propelled and embedded while sequentially connecting the underground structures. That's fine. As described above, the present invention is suitably used for excavation of a vertically long cross-sectional shape, but is not limited thereto, and can be applied to various rectangular cross sections such as a square cross section. Further, the excavating means A may be configured not to be single but to be provided in the left and right or up and down depending on the cross-sectional shape to be excavated, and a mechanism for rotating the screw auger 2 in the left and right direction is added. It is good also as composition to do.

The vertical side view of the principal part of a horizontal hole excavation apparatus. The simplified front view. The rear view which cut the AA line in FIG. The rear view which cut the BB line in FIG. The longitudinal cross-sectional front view which shows the structure of the rotation fulcrum part of an auger support cylinder. The simplified side view of the bearing body. The simplified longitudinal section side view of a horizontal hole excavator. The simplified longitudinal cross-sectional view of the earth and sand discharge chute part. The simplified vertical side view showing the state of the underground structure propulsion and burial construction. The simplified vertical side view of the part which arrange | positioned the horizontal hole excavation apparatus. The whole simplified front view.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Tube 2 Screw auger 3 Auger support cylinder 4 Rotation drive means 5 Rail member 6 Moving stand 7 Chain block 8 Jack for vertical rotation 9 Jack for forward / backward movement
11 Sediment containment enclosure
12 Sediment discharge means
15 Sediment discharge chute
16 Propulsion means
17 shaft
18 Bearing body

Claims (6)

  A screw auger for excavating the front ground of the tubular body is disposed in a tubular body having a rectangular cross section pushed forward by the propelling means so as to be pivotable up and down and removable on the rear side of the tubular body. Horizontal hole drilling rig.   Rotation drive in which the auger support cylinder is suspended in a tubular body so as to be movable in the front-rear direction and can be moved up and down, and the base of the screw auger is inserted into the auger support cylinder and disposed in the rear end portion of the auger support cylinder In addition, a shaft body projects from both side surfaces of the auger support cylinder and the shaft body is fixed to the inner surface of both side wall portions of the tube body so that it can be attached and detached in the vertical direction. The horizontal hole excavation device according to claim 1, wherein the horizontal hole excavation device is movably fitted and supported.   An auger support tube is suspended in the tube so as to be movable in the front-rear direction, and a base portion of a screw auger is inserted into the auger support tube and connected to a rotation driving means disposed in a rear end portion of the auger support tube. The auger support cylinder is further provided with a forward / backward movement jack for moving the rotary drive means back and forth so that the tip cutter head of the screw auger protrudes and retracts from the opening at the front end of the tube, The horizontal hole excavating device according to claim 1 or 2, wherein a jack for vertically rotating the screw auger is detachably disposed between the inner surfaces of the parts.   The cross section of the tube body is a vertically long rectangular shape, and the drilling diameter by the screw auger is formed to have a diameter substantially equal to the horizontal width of the vertically long rectangular cross section of the tube body, and protrudes from the auger support tube on the inner bottom surface of the front end portion of the tube body. The earth-and-sand housing / leading housing that can accept the front part of the screw auger is disposed in a state inclined obliquely upward from the front end toward the rear end, and the rear-end outlet of the earth-and-sand housing / leading housing The horizontal hole excavation device according to claim 1, 2 or 3, wherein earth and sand discharging means are arranged from below to the rear end of the pipe body.   The front end surface of both side walls in the front end opening of the tubular body is formed as a convex arcuate front end surface along the up-and-down rotation trajectory of the cutter head of the screw auger. The horizontal hole excavation device according to claim 1.   The earth and sand discharge means is composed of a screw conveyor, and the upper end of the earth and sand discharge chute arranged at one lower part at the rear end of the pipe is communicated with the conveying end of the screw conveyor. The horizontal hole excavation device according to any one of claims 1 to 4, wherein the discharge port protrudes outward from a lower portion on one side of the tube body.

Images