JP6597868B2 - Drilling device and drilling method - Google Patents

Description

  The present invention relates to a drilling apparatus and a drilling method used for forming a continuous wall such as a water stop and a soil cement wall for a foundation in the ground.

  2. Description of the Related Art Conventionally, excavating apparatuses that excavate underground and form continuous grooves include a lower traveling body equipped with a crawler for traveling on the ground, an upper revolving body mounted on the lower traveling body, and the upper revolving body. And a gate-type frame. This portal frame includes a pair of traversing cylinders arranged vertically and a leader. The pair of traverse cylinders slide the leader in a lateral direction parallel to the ground. The excavator further includes a cutter post and a chain cutter.

  The cutter post is suspended from the leader, and the chain cutter rotates around the cutter post using the cutter post as a guide. The chain-type cutter includes an endless chain that is rotationally driven, and a plurality of bit plates that are arranged on the outer peripheral side of the endless chain at intervals along the circumferential direction. A plurality of excavation bits are arranged on each bit plate. As the chain cutter rotates, the cutter post is moved laterally in the ground, so that a groove is excavated in the traveling direction.

  Patent Document 1 discloses a technique in which an excavation bit goes around along a corner portion of a cutter post. Patent Document 2 discloses a technique in which a cutter post is provided with a guide mechanism that regulates the position of the chain in order to prevent the chain from drooping around a cutter post arranged in an inclined manner. .

JP 1997-264441 A JP 2003-74084 A

  In recent years, in the excavation performance of the excavator, an increase in the groove width of the excavated groove has been demanded. In order to increase the groove width, it is necessary to increase the width of the bit plate that supports the drill bit. In this case, a large rotational moment is easily applied to the bit plate due to the reaction force received from the natural ground. As a result, there is a problem that a strong shearing force is applied to the bolt that fixes the bit plate and the chain, and the bolt is loosened or detached.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a drilling device and a drilling method capable of reducing a shearing force applied to a fastening member that fixes a drilling blade plate and a chain. To do.

  An excavation apparatus according to one aspect of the present invention is an excavation apparatus that forms a continuous groove in the ground, and an apparatus main body disposed on the ground, and a support body that is suspended from the apparatus main body and disposed in the ground. And an endless chain supported by the support so as to be movable along a predetermined circumferential surface on the outer periphery of the support, and an interval along the circumferential direction of the chain. A plurality of excavation blade plates fixed to the outer circumferential surface of the chain, and extend longer than the chain along the circumferential direction of the chain and the width direction of the chain perpendicular to the circumferential direction of the chain, A plate main body including a front surface and a back surface, and a plurality of excavation blades disposed at least at both ends in the width direction on the front surface of the plate main body and facing the underground ground. A plurality of excavation blade plates excavating the natural ground by moving in a circular manner, and the chain and the excavation blade plate so that the outer peripheral surface of the chain and the back surface of the plate body are in pressure contact with each other. A plurality of fastening members fastened along a direction parallel to the circumferential surface and perpendicular to the width direction, a chain drive unit for moving the chain around the circumferential direction, and the support body along a predetermined traveling direction A support drive unit for moving the support, wherein the support is provided with a pair of regulating surfaces that are spaced apart from each other in the width direction and continuously extend along the circumferential direction, The plates are a pair of restricting members that are disposed on both sides of the chain in the width direction and extend from the back surface of the plate body, and the excavation blade plate is in the circumferential direction. A pair of regulating members each including a regulated surface capable of contacting the regulating surface of the support at an arbitrary position in the circumferential direction so as to regulate rotation about an axis extending along the axis; Is a box-shaped shape including a pair of support walls that support the chain so as to be capable of revolving, and a pair of side walls that are connected to both ends of the pair of support walls in the width direction and that include the restriction surfaces. The pair of restricting members extend from the back surface of the plate body to the position facing the side wall over the support wall of the support body in parallel with the circumferential surface, and in the width direction, The pair of regulating surfaces of the support are arranged so as to face the outside in the width direction, and the pair of regulated surfaces are respectively arranged with respect to the regulation surface with the width. Direction It is arrange | positioned facing the outer side of the direction.

  According to this configuration, during excavation of the natural ground, even when a moment that causes the excavation blade plate to rotate about the axis extending along the circulation direction is generated by the reaction force that the excavation blade receives from the natural ground. The rotation of the excavation blade plate is regulated by the pair of regulating members coming into contact with the support. For this reason, it becomes possible to make small the shear force concerning the fastening member which fixes a digging blade plate. As a result, loosening, disengagement, breakage, and the like of the fastening member can be suppressed.

  Moreover, according to this structure, a control member contact | abuts to a support body along the direction which cross | intersects the reaction force which a digging blade receives from a natural ground. For this reason, rotation of a digging blade plate can be controlled, reducing the load concerning a digging blade plate. Moreover, the contact part of a control member and a support body can be arrange | positioned in the position away from the excavation part of the natural ground. For this reason, it is suppressed that a high-pressure earth and sand intervenes in a contact part and a regulation function is prevented.

  Furthermore, according to this configuration, the function of supporting the chain and the function of regulating the rotation of the excavation blade plate can be shared by different wall portions. Moreover, the reaction force which a digging blade receives from a natural ground can be received by the side wall of a support body. For this reason, rotation of a digging blade plate can be controlled stably.

  Said structure WHEREIN: It is desirable for the said side wall to be provided with the base surface and the protrusion part which protrudes to the said width direction outer side from the said base surface, extends along the said circumference direction, and contains the said control surface.

  According to this configuration, the rotation of the excavation blade plate can be restricted regardless of the shape of the base surface by arranging the restriction surface on the protruding portion protruding from the side wall.

  Said structure WHEREIN: In the cross section orthogonal to the said circumference | surroundings direction, said one of the said to-be-regulated surface of the said regulating member and the said regulating surface of the said support body is provided with the convex curvilinear shape toward the said other. It is desirable.

  According to this structure, compared with the case where planes contact, the sliding resistance of a control member and a support body becomes small. For this reason, the circular movement of the chain is smoothly realized while the regulating member is in contact with the support.

  In the above configuration, it is desirable to further include a fall restricting member that is disposed at a base end portion of the restricting member and restricts the fall of the restricting member with respect to the plate body in a cross section orthogonal to the circumferential direction.

  According to this structure, since the fall of the control member with respect to a plate main body is suppressed, the contact part of a control member and a support body is maintained stably. As a result, the rotation of the excavation blade plate around the axis extending along the circumferential direction is stably regulated.

  In the above configuration, when the width between the pair of side walls in the width direction is d and the distance in the width direction between the excavating blades arranged at both ends of the excavating blade plate is L, L ≧ d × It is desirable that the relationship of 2.5 is satisfied.

  According to this configuration, even when excavating a wide area in the ground, the excavation blade plate rotates around the axis extending along the circulation direction while the circular movement of the chain and the advance of the support are stably performed. Is regulated. As a result, the shearing force applied to the fastening member can be reduced.

  An excavation method according to another aspect of the present invention provides an outer peripheral surface of a predetermined support body having a box shape including a pair of support walls and a pair of side walls respectively connected to both end sides of the pair of support walls. In the plate body including an endless chain supported by the pair of support walls of the support, a front surface and a back surface, so as to be movable in a predetermined circumferential direction along a predetermined circumferential surface, A plurality of excavating blades arranged at least at both ends of the surface of the plate body in the width direction of the chain orthogonal to the circumferential surface and the circumferential direction, respectively, and facing underground ground, A plurality of excavation blade plates fixed on an outer peripheral surface at intervals along the circumferential direction, and integrally moving to form a continuous groove in the ground, wherein the chain In the width direction, the chain is disposed on both sides of the chain, and from the back surface of the plate main body of the excavation blade plate to the position facing the side wall across the support wall of the support body, in parallel with the circumferential surface, respectively. A pair of extending restricting members abut against the support as the chain and the excavation blade plate rotate, thereby restricting the excavation blade plate from rotating about an axis extending along the rotation direction. However, it has the excavation process which excavates the natural ground with the excavation blade.

  According to this configuration, during excavation of the natural ground, the excavation blade plate is restricted from rotating around the axis extending along the circumferential direction. For this reason, excavation work can be performed while maintaining a small shearing force applied to the fastening member that fixes the excavation blade plate.

  In the above configuration, the reinforcing member disposed at the base end portion of the restricting member connects the restricting member and the plate body to restrict the restriction member from being tilted with respect to the plate body in a cross section orthogonal to the circumferential direction. However, the natural ground may be excavated by the excavating blade.

  According to this configuration, during excavation of the natural ground, rotation of the excavation blade plate about the axis extending along the circumferential direction is stably regulated.

  In the above configuration, when the width of the support body in the width direction is d and the distance in the width direction between the excavation blades arranged at both ends of the excavation blade plate is L, L ≧ d × 2. The width of each of the support and the plate body and the arrangement of the excavation blades may be set so that the relationship 5 is satisfied.

  According to this configuration, even when excavating a wide area in the ground, the excavation blade plate is restricted from rotating around the axis extending along the circumferential direction. As a result, excavation work can be performed while keeping the shearing force applied to the fastening member small.

  ADVANTAGE OF THE INVENTION According to this invention, the excavation apparatus and excavation method which can make small the shear force concerning the fastening member which fixes an excavation blade plate and a chain are provided.

It is a side view showing the whole excavation equipment composition concerning a 1st embodiment of the present invention. It is a front view showing the whole excavation equipment composition concerning a 1st embodiment of the present invention. It is a typical side view which shows the structure of the support body and chain type cutter of an excavation apparatus which concern on 1st Embodiment of this invention. It is a front view which shows a part of chain type cutter of the excavator which concerns on 1st Embodiment of this invention. It is a top view which shows a part of chain type cutter of the excavator which concerns on 1st Embodiment of this invention. It is a front view which shows a part of chain type cutter of the excavator which concerns on 1st Embodiment of this invention. It is a side view which shows a part of chain type cutter of the excavator which concerns on 1st Embodiment of this invention. It is a top view which shows a part of chain type cutter of the excavator which concerns on 1st Embodiment of this invention. It is typical sectional drawing which shows the structure of the support body and chain type cutter of an excavation apparatus which concern on 1st Embodiment of this invention. It is a top view which shows the structure of the chain type cutter which concerns on 1st Embodiment of this invention. It is a rear view which shows the structure of the chain type cutter which concerns on 1st Embodiment of this invention. It is a front view which shows the structure of the chain type cutter which concerns on 1st Embodiment of this invention. It is a side view which shows the structure of the chain type cutter which concerns on 1st Embodiment of this invention. It is sectional drawing of the support body and chain of an excavation apparatus which concern on 2nd Embodiment of this invention. It is the front view which expanded a part of chain of the excavation equipment concerning a 2nd embodiment of the present invention. It is the side view to which a part of chain of the excavation equipment concerning a 2nd embodiment of the present invention was expanded. It is sectional drawing of the chain and excavation blade plate of an excavation apparatus which concern on 2nd Embodiment of this invention. It is typical sectional drawing which shows the structure of the support body and chain type cutter of an excavation apparatus which concern on the deformation | transformation embodiment of this invention. It is sectional drawing of the chain and excavation blade plate of an excavation apparatus which concern on deformation | transformation embodiment of this invention. It is typical sectional drawing which shows the structure of the support body of another drilling apparatus compared with the drilling apparatus which concerns on embodiment of this invention, and a chain type cutter.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a side view of a groove excavator 1 (excavator) according to the first embodiment of the present invention, and FIG. 2 is a front view of the groove excavator 1. Hereafter, in each figure, directions of “up”, “down”, “front” and “rear” are shown, and the directions are the structure and excavation method of the groove excavator 1 according to the present invention. For convenience of explanation, the usage mode of the trench excavator 1 is not limited.

  The groove excavator 1 includes a lower traveling body 3 equipped with a crawler 2 movable on the ground surface, an upper swing body 4 (device main body) mounted on the lower traveling body 3, and the upper swing body 4. A leader 5 provided so as to be movable up and down, a cutter post 6 (support) suspended from the leader 5 and disposed in the ground, a rotation drive device 7 (chain drive unit), and a moving mechanism 13S are provided. is doing. FIG. 3 is a schematic side view showing the structure of the cutter post 6 and the chain cutter 10 of the groove excavator 1 according to the present embodiment.

  The cutter post 6 is a box material having a rectangular parallelepiped shape, and a plurality of cutter posts 6 are connected vertically. The rotation drive device 7 includes a drive roller 8 driven by hydraulic pressure and an idler roller 9 (FIG. 3). The drive roller 8 is disposed at the upper end portion of the connected cutter post 6, and the idler roller 9 is disposed at the lower end portion of the connected cutter post 6. A chain cutter 10 is stretched between the drive roller 8 and the idler roller 9 so as to be able to move around. The rotary drive device 7 moves the chain 11 in a circular motion along the circular direction DA (FIG. 3). The power unit 1 </ b> P supplies a hydraulic pressure source to the rotation drive device 7.

  As shown in FIG. 3, the chain cutter 10 includes an endless (endless) chain 11 and a plurality of cutter bit plates 50 arranged on the outer peripheral side of the chain 11. The chain 11 is supported by the cutter post 6 so as to be movable on the outer periphery of the cutter post 6 along a predetermined circumferential surface in a predetermined circumferential direction. Note that the circumferential surface of the chain 11 is a surface parallel to the paper surface of FIG. 3 and includes a locus drawn by one side edge of the chain 11 during circulation. Further, the rotating direction of the chain 11 that moves around is indicated by arrows DA and DB in FIG. Further, the width direction of the chain 11 is a direction orthogonal to the circumferential surface and the circumferential direction of the chain 11, and corresponds to a direction orthogonal to the paper surface of FIG. 3 (left-right direction in FIG. 3).

  The cutter bit plate 50 is a plurality of plate-like members that are fixed to the outer peripheral surface of the chain 11 at intervals along the circumferential direction of the chain 11. The cutter bit plate 50 includes a plurality of excavation bits 12 (FIG. 2) (excavation blades). The excavation bits 12 are disposed at least at both ends in the width direction of the cutter bit plate 50 and face the underground ground. The excavation bit 12 is made of a carbide tip. The cutter bit plate 50 circulates integrally with the chain 11 to excavate natural ground.

  The driving roller 8 is provided with a tension adjusting mechanism for adjusting the tension of the chain 11. In FIG. 3, the chain cutter 10 receives the rotational driving force of the driving roller 8 and moves in the arrow DA direction (vertically downward) at the front portion of the cutter post 6, and the arrow DB at the rear portion of the cutter post 6. It is moved so that it moves in the direction (vertically upward). The idler roller 9 rotates following the chain 11 of the chain cutter 10. As shown in FIG. 3, the drive roller 8 includes a drive roller shaft 8A, and the idler roller 9 includes an idler roller shaft 9A.

  A portal frame 13 (FIG. 2) is attached to the upper swing body 4, and a moving mechanism 13 </ b> S (support body driving unit) is disposed on the portal frame 13. The moving mechanism 13 </ b> S includes a traverse upper cylinder 14 disposed at the upper portion of the portal frame 13 and a traverse lower cylinder 15 disposed at the lower portion of the portal frame 13. The transverse upper cylinder 14 and the transverse lower cylinder 15 are arranged in parallel.

The thrust F _PL of the transverse lower cylinder 15, is moved along the cutter post 6 in a predetermined traveling direction (forward direction), and so can be pressed against the natural ground, transverse on the cylinder 14 at this time, rampant A cylinder holding force in a direction opposite to the pressing direction of the lower cylinder 15 is generated.

  Reference numerals 16 and 17 in FIG. 1 denote a pair of backstays (only the front side is shown) supporting the leader 5. The cabin 18 on which the operator is boarded is mounted on the upper swing body 4.

  The groove excavator 1 moves the excavation bit 12 of the chain-type cutter 10 in a substantially vertical direction while pressing the cutter post 6 inserted in the ground in the horizontal direction, and excavates every pattern according to the principle of cutting with a canna. . In addition, 1 pattern here means the area | region excavated by 1 group of the excavation bits 12 provided along the rotation direction in the chain type cutter 10.

Note that if insufficient thrust F _PL is the transverse lower cylinder 15, the drilling traversing speed can not be drilled in the ground decreases. As an example, the rated thrust _{F PL} of the transverse lower cylinder 15 of the excavator 1 shown in this embodiment is 539KN.

Where Vb: tangential speed (mm / sec), Ve: excavation speed (mm / Hr), Lp: full-section excavation 1 pattern length (mm), t _px : depth of cut per pattern (mm) ,
Lp: t _px = Vb: Ve (Expression 1)
The relationship is satisfied. From Equation 1, the following Equation 2 is derived.
t _px = Ve × Lp / Vb (Formula 2)
Therefore, the cutting depth t _px per pattern is obtained from Equation 2.

  FIG. 4 is a front view showing a part (10A) of the chain cutter 10 of the groove excavator 1 according to the present embodiment, and FIG. 5 is a top view showing a part (10A) of the chain cutter 10. is there. 6 is a front view showing a part (10B) of the chain cutter 10 of the groove excavator 1, FIG. 7 is a side view showing a part (10B) of the chain cutter 10, and FIG. FIG. 3 is a top view showing a part (10B) of the chain cutter 10;

  In the chain cutter 10 according to the present embodiment, the first cutter unit 10A shown in FIG. 4 and the second cutter unit 10B shown in FIG. 6 are alternately connected along the circumferential direction of the chain cutter 10. It is composed of that. The connection mode of the first cutter unit 10A and the second cutter unit 10B is not limited to this, and the two first cutter units 10A are continuously connected, and then the second cutter unit 10B. May be connected. In this embodiment, the 1st cutter unit 10A and the 2nd cutter unit 10B comprise 1 group of the above-mentioned excavation bits 12. FIG.

  In the chain 11 constituting the first cutter unit 10A and the second cutter unit 10B, a plurality of pairs of links 110A or half links 110B arranged at intervals in the width direction of the chain 11 are arranged along the circumferential direction. It is formed by being connected (see FIG. 7). In the present embodiment, one half link 110B is disposed between the 17 links 110A. Adjacent links 110A or half links 110B are connected to each other by fixing pins 150 (FIG. 7). In other words, the chain 11 keeps a constant distance between the pair of endless strips 11A and 11B (FIG. 6) arranged at intervals in the width direction and the strips. Thus, a fixing pin 150 that connects the pair of belt bodies 11A and 11B to each other is provided. The outer peripheral surfaces of the strips 11 </ b> A and 11 </ b> B correspond to the outer peripheral surface of the chain 11. Each of the strips 11A and 11B includes a plurality of links 110A (half links 110B) arranged adjacent to each other in the circumferential direction, and a fixing pin 150 that couples the adjacent links 110A. In other words, the fixing pin 150 connects the adjacent bands 11A and 11B along the width direction and connects the adjacent links 110A along the circumferential direction.

  The first cutter unit 10A has a function of excavating a region on the inner side in the width direction of the excavation width W (see FIG. 9) in which the chain cutter 10 excavates the natural ground M. The first cutter unit 10A includes a plurality of first cutter bit plates 50A fixed on the chain 11 described above. In the present embodiment, eight first cutter bit plates 50A are arranged for one first cutter unit 10A. The first cutter bit plate 50 </ b> A is an aspect of the cutter bit plate 50. The first cutter bit plate 50A is fixed on the link 110A of the chain 11 by a plurality of (four) shoe bolts S1 and nuts (not shown) (FIG. 4). The lengths in the width direction of the plurality of first cutter bit plates 50A of the first cutter unit 10A are set to be different from each other. Note that the widths of some of the first cutter bit plates 50A may be set to the same value.

  The first excavation bit 12A is fixed on the first cutter bit plate 50A. In the present embodiment, the maximum width K (FIGS. 4 and 5) of the first excavation bit 12A of the first cutter unit 10A is set to 850 mm. As shown in FIG. 5, when the plurality of first cutter bit plates 50A are viewed along the rotation direction DA, the first excavation bits 12A provided in each first cutter bit plate 50A are in the width direction of the maximum width K. It is arranged continuously throughout. As a result, the area corresponding to the maximum width K in the excavation width W of the natural ground M is excavated by the first cutter unit 10A.

  6-8, the 2nd cutter unit 10B is provided with the function which excavates the area | region of the width direction outer side among the excavation width W (refer FIG. 9) which the chain type cutter 10 excavates the natural ground M. FIG. ing.

  The second cutter unit 10B includes a plurality of second cutter bit plates 50B fixed on the chain 11 described above. The second cutter bit plate 50 </ b> B is an aspect of the cutter bit plate 50. In the present embodiment, one second cutter unit 10B includes three second cutter bit plates 50B. Note that the cutter bit plates appearing at both ends in FIG. 6 are the first cutter bit plates 50A (FIG. 4) of the adjacent first cutter unit 10A. The second cutter bit plate 50B is fixed on the link 110A of the chain 11 by a plurality of shoe bolts S1 and nuts (not shown) (FIG. 7).

  The length in the width direction of the plurality of second cutter bit plates 50B is set to be slightly different from the length in the width direction of the first cutter bit plate 50A. The second excavation bit 12B is fixed on the second cutter bit plate 50B. In the present embodiment, the maximum width L (FIGS. 6 and 8) of the second excavation bit 12B is set to 1000 mm. As shown in FIG. 8, when the plurality of second cutter bit plates 50B are viewed along the circumferential direction DA, the second excavation bits 12B provided in each second cutter bit plate 50B are in the width direction of the maximum width L. Are arranged together at both ends. As a result, of the excavation width W of the natural ground, regions corresponding to both end portions of the maximum width L are excavated by the second cutter unit 10B.

  Further, the second cutter unit 10 </ b> B includes a scram plate 115. As shown in FIGS. 6 and 7, a pair of scram plates 115 are arranged on the upstream and downstream sides of the circumferential direction DA of one second cutter bit plate 50B. The scram plate 115 is fixed to the link 110A by a plurality (four) of shoe bolts S1 and nuts. The pair of scram plates 115 are arranged so as to sandwich the second cutter bit plate 50B, and the side edges of the scram plate 115 and the side edges of the second cutter bit plate 50B are in contact with each other.

  FIG. 9 is a schematic cross-sectional view showing the structure of the cutter post 6 and the second cutter unit 10B of the groove excavator 1 according to one embodiment of the present invention. 10 to 13 are a top view, a rear view, a front view, and a side view, respectively, showing the structure of the second cutter unit 10B according to this embodiment in more detail. 11 to 13 correspond to views of the second cutter unit 10B of FIG. 10 as viewed along arrows D101, D102, and D103, respectively.

  With reference to FIGS. 9 to 13, the cutter post 6 includes a pair of side walls 60, a pair of support walls 61 that connect the pair of side walls 60, and a pair of opposing walls 62 ( 9) and a pair of chain sliding portions 61S (FIG. 10).

  The pair of support walls 61 are wall surfaces that support the second cutter unit 10 </ b> B (chain-type cutter 10) of the cutter post 6 so as to be able to move around. For this reason, the support wall 61 is arrange | positioned facing the plate main body 501 of the 2nd cutter unit 10B, and is extended along the left-right direction (width direction of the chain 11). The pair of side walls 60 extends along a direction (front-rear direction) orthogonal to the pair of support walls 61. The pair of side walls 60 are disposed on both end sides in the width direction of the pair of support walls 61 and include a regulation surface 6H described later. The pair of opposing walls 62 (FIG. 9) are wall portions arranged so as to protrude forward from both end portions in the left-right direction of the support wall 61. The chain 11 is accommodated between the pair of opposing walls 62. In addition, in FIG. 10, illustration of the opposing wall 62 is abbreviate | omitted.

  The pair of chain sliding portions 61 </ b> S is a plate-like member fixed to the support wall 61 inside the pair of opposing walls 62. The chain sliding portion 61S is made of a member having low frictional resistance and high slidability. Further, a hard resin, a wear-resistant metal, or the like may be used for the chain sliding portion 61S. The opposing wall 62 and the chain sliding portion 61S extend long over the entire vertical direction of the cutter post 6, and have a function of guiding the circular motion of the chain 11.

  Further, the cutter post 6 includes a guide portion 65. As shown in FIG. 9, two guide portions 65 are arranged on the pair of left and right side walls 60 at intervals in the front-rear direction. In other embodiments, the two guide portions 65 arranged on one side wall 60 may be formed of one member. The guide portion 65 has a function of abutting against a later-described restriction plate 502 provided in the second cutter unit 10B and guiding the circular movement of the second cutter unit 10B. In FIG. 9, the shape of the outer peripheral surface of the guide portion 65 is exaggerated. In other words, the outer peripheral surface of the guide portion 65 has a circular arc shape that is convex toward the restriction plate 502. The arc shape is gentle, and the actual cross-sectional shape of the guide portion 65 is substantially rectangular when viewed as shown in FIG. Note that, as with the chain sliding portion 61S, a member with low frictional resistance and high slidability is also used for the guide portion 65. The guide portion 65 may be made of hard resin or wear-resistant metal. In other words, for the guide portion 65, the cutter post 6 includes a pair of restricting surfaces 6 </ b> H that are arranged at intervals in the width direction and continuously extend along the circumferential direction of the chain 11. In the present embodiment, the restriction surface 6H is configured by the outer surface of the guide portion 65, and is disposed so as to face the outer side in the width direction of the chain 11 (the outer side in the left-right direction).

  In other words, in other words, the side wall 60 protrudes outward in the width direction from the base surface, extends along the circumferential direction, and includes the guide surface 65 (protruding portion) including the regulating surface 6H. ) And. Referring to FIGS. 9 and 10, the second cutter bit plate 50B fixed to the chain 11 includes a plate body 501, a pair of restriction plates 502 (restriction members), and a plurality of reinforcing ribs 503 (falling restriction members). And the aforementioned second excavation bit 12B.

  The plate body 501 is a plate-like portion that extends longer than the chain 11 in the width direction (left-right direction) of the chain 11, and includes a surface facing the natural ground M and a back surface opposite to the surface. The second excavation bit 12B is fixed to both ends of the surface of the plate body 501. In FIG. 10, a bit tip 12B1 made of super steel material appears at the tip of the second excavation bit 12B. As shown in FIG. 13, a plurality of bit chips 12B1 are arranged at intervals in the circumferential direction (vertical direction). The back surface of the plate body 501 (the rear side surface in FIG. 10) is in contact with and supported by the outer peripheral surface of the chain 11. Four bolt holes ST are opened in the plate body 501, and the second cutter unit 10 </ b> B is fastened to the chain 11 by shoe bolts S <b> 1 (FIG. 7) inserted through these bolt holes ST and nuts (not shown). Is done.

  The pair of restriction plates 502 are arranged at positions on both sides of the chain 11 in the left-right direction (width direction) and extend from the back surface of the plate body 501. When the chain 11 and the second cutter unit 10B go around, the restriction plate 502 comes into contact with or slides on the guide portion 65 of the cutter post 6 so that the second cutter unit 10B goes around (in FIG. 9 and FIG. Rotation about an axis extending along the vertical direction). In the present embodiment, the pair of restriction plates 502 are arranged so as to sandwich the cutter post 6 in the left-right direction, and abut against the guide portion 65 along the left-right direction. For this reason, the regulation plate 502 includes a regulated surface 502H that can come into contact with the regulation surface 6H of the cutter post 6 at an arbitrary position in the circumferential direction of the chain 11. The regulated surfaces 502H are arranged to face the outside in the width direction with respect to the regulating surface 6H (FIG. 9). In addition, as shown in FIG. 3, the driving roller 8 and the idler roller 9 are arrange | positioned at the cutter post 6 of an upper end side and a lower end side. Therefore, in order to prevent interference between the restriction plate 502 and the drive roller shaft 8A of the drive roller 8 and the idler roller shaft 9A of the idler roller 9 as the chain cutter 10 turns, the tip of the restriction plate 502 is The drive roller shaft 8A and the idler roller shaft 9A are arranged at a predetermined interval (FIG. 9). As a result, the interval h in FIG. 9 is larger than the shaft diameters of the drive roller shaft 8A and the idler roller shaft 9A.

  The plurality of reinforcing ribs 503 are disposed at the base end portion of the restriction plate 502 and restrict the fall of the restriction plate 502 with respect to the plate body 501 in the cross section orthogonal to the circumferential direction of the chain 11. In FIG. 9, the reinforcing ribs 503 are arranged on the left and right side surfaces at the base end portion of one regulating plate 502, but as shown in FIG. On one side, reinforcing ribs 503 may be arranged. In this case, as shown in FIG. 11, it is desirable that a plurality of reinforcing ribs 503 be arranged at intervals in the vertical direction. The number of reinforcing ribs 503 is not limited to these. Further, the reinforcing rib 503 may be formed integrally or separately from the restriction plate 502.

  In the present embodiment, the second cutter bit plate 50B of the second cutter unit 10B has a structure as shown in FIGS. On the other hand, the first cutter bit plate 50A of the first cutter unit 10A does not include the restriction plate 502 and the reinforcing rib 503 in FIGS. That is, the back surface of the first cutter bit plate 50A has a flat shape along the left-right direction. Also in this case, the first cutter bit plate 50A is fixed to the chain 11 by the four shoe bolts S1 and the nuts as described above.

  FIG. 20 is a top view of the cutter post 6Z and the cutter unit 10Z of another groove excavator compared with the groove excavator 1 according to the present embodiment. The groove excavator corresponds to a configuration in which the restriction plate 502, the reinforcing rib 503, and the guide portion 65 of the cutter post 6 (FIG. 9) are removed from the second cutter unit 10B (FIG. 9) according to the present embodiment. Below, the subject of the groove excavator shown in FIG. 20 will be described. In FIG. 20, members having the same functions and structures as the cutter post 6 and the second cutter unit 10 </ b> B according to the present embodiment are denoted by the same reference numerals as in FIG. 9.

  The cutter unit 10Z has a function of excavating a region on the outer side in the width direction in the excavation width W (FIG. 20) of the natural ground M, similarly to the second cutter unit 10B according to the present embodiment. Conventionally, in an excavator used for forming a continuous wall such as a water stop or foundation soil cement wall in the ground, the excavation width W is often set within 850 mm. On the other hand, in recent years, such continuous walls are expected to be used as main walls in addition to earth retaining walls and foundation walls, and an increase in the excavation width W is required.

  As shown in FIG. 20, when the excavation width W is increased while the width d of the cutter post 6Z is fixed, the posture of the second cutter bit plate 50B of the cutter unit 10Z tends to become unstable. If there is a difference in the reaction force R received by the pair of second excavation bits 12B of the second cutter bit plate 50B from the natural ground M, the second cutter bit plate 50B has a rotational moment ( A moment is applied such that the second cutter bit plate 50B rotates in a cross section orthogonal to the circumferential movement direction of the chain cutter 10. Further, when the second cutter bit plate 50B moves around the cutter post 6Z together with the chain 11, the second cutter bit plate 50B has an arrow in FIG. A rotational moment as indicated by DT (a moment that causes the second cutter bit plate 50B to rotate in a plane including the circumferential movement direction of the chain cutter 10Z and the width direction of the chain 11) is applied. When such a rotational moment is applied to the second cutter bit plate 50B, a large shearing force is applied to the shoe bolt S1 (FIG. 7) that fixes the second cutter bit plate 50B and the chain 11, and the shoe bolt S1. Looseness, disengagement, breakage, etc. are likely to occur. Such a rotational moment is remarkably generated in the second cutter bit plate 50B (FIG. 6) in which the length in the width direction is set larger than that of the first cutter bit plate 50A (FIG. 4).

  On the other hand, in FIG. 20, in order to stabilize the posture of the second cutter bit plate 50B, it is considered that the width d of the cutter post 6 is enlarged and the cutter post 6 is shaped as shown by a two-dot chain line in FIG. It is done. However, in this case, the cutter post 6 is disposed on the back side of the second excavation bit 12B (the back side of both end portions of the second cutter bit plate 50B). In this case, the earth and sand excavated by the second excavation bit 12B is prevented from flowing as indicated by the arrow DJ. As a result, a large pressure is applied around the second cutter bit plate 50B, making it difficult for the chain cutter 10 to move around and to advance forward. In other words, as shown in FIG. 20, when the maximum width of the second excavation bit 12B of the second cutter bit plate 50B is set larger than the width d of the cutter post 6, the excavated earth and sand The flow (arrow DJ) is smooth, and excavation work with a wide excavation width W can be performed smoothly. In addition, as a result of accumulating a plurality of experiments, the present inventor found that when the maximum width L (FIG. 6) between the pair of second excavation bits 12B of the second cutter bit plate 50B is 1000 mm or more, L ≧ d × 2. It has been found that the above effect is greatly expressed when the relationship 5 is satisfied. On the other hand, when such a structure is adopted, as described above, the rotational moment related to the second cutter bit plate 50B and the shearing force to the shoe bolt S1 become a problem.

  In order to solve such a problem, in the present embodiment, the second cutter bit plate 50B has a structure as shown in FIGS. Then, during excavation of the natural ground M, the second cutter bit plate 50B follows the turning direction (direction perpendicular to the paper surface of FIG. 9) by the reaction force R (FIG. 20) received by the second excavation bit 12B from the natural ground. Even when a moment (arrow DS in FIG. 20) that rotates around the extending axis is generated, the second cutter bit plate is brought into contact with the guide portion 65 of the cutter post 6 by the pair of restricting plates 502 coming into contact with each other. The rotation of 50B is restricted. For this reason, it becomes possible to make small the shear force concerning the shoe volt | bolt S1 which fixes the 2nd cutter bit plate 50B and the chain 11. FIG. As a result, the shoe bolt S1 can be prevented from being loosened, detached or damaged.

  Further, in FIG. 9, the pair of regulation plates 502 and the guide portions 65 each have a shape that extends long along the circumferential direction of the chain 11. Therefore, even when a moment (arrow DT in FIG. 6) is generated during excavation of the natural ground M, the second cutter bit plate 50B rotates in a plane parallel to the plate body 501. The rotation of the cutter bit plate 50 is restricted by the contact between 502 and the guide portion 65. For this reason, the shearing force applied to the shoe bolt S1 for fixing the cutter bit plate 50 can be further reduced.

  In the present embodiment, the rotation restriction and the circular movement of the second cutter bit plate 50B are stably realized by the guide portion 65 made of hard resin or wear-resistant metal. Further, the structure around the chain 11 of the groove excavator 1 is not complicated as compared with the case where the guide portion 65 is disposed on the support wall 61 side of the cutter post 6. For this reason, it is suppressed that the earth and sand of the excavated natural ground M remain around the chain 11, and the circular movement of the chain 11 and the 2nd cutter bit plate 50B (cutter bit plate 50) is prevented.

  Further, as shown in FIG. 9, the pair of regulation plates 502 are disposed so as to sandwich the cutter post 6 in the width direction, and abut against the guide portion 65 along the width direction. In this case, the restriction plate 502 abuts against the guide portion 65 along the direction intersecting with the reaction force R received by the second excavation bit 12B from the natural ground M. For this reason, rotation of the 2nd cutter bit plate 50B can be controlled, reducing the load concerning the 2nd cutter bit plate 50B. Moreover, in said structure, the contact part of the control plate 502 and the cutter post 6 can be arrange | positioned in the position away from the excavation part of the natural ground M. FIG. In particular, in FIG. 9, the restriction plate 502 itself has a shape that prevents the earth and sand of the natural ground M from entering the contact portion between the restriction plate 502 and the guide portion 65 (see arrow DJ in FIG. 20). . For this reason, it is suppressed that a high pressure earth and sand intervenes in a contact part, and a rotation regulation function and a guide function are prevented.

  In the present embodiment, as shown in FIGS. 6 and 7, each second cutter bit plate 50 </ b> B is disposed so as to be in close contact with and sandwiched by a pair of scram plates 115. For this reason, a rotational moment as shown by the arrow DT in FIG. 6 is more unlikely to occur with respect to the second cutter bit plate 50B.

  In this embodiment, as shown in FIG. 9, the outer peripheral surface of the guide portion 65 has a gentle arc shape (arc surface, hemispherical surface). For this reason, compared with the case where planes contact in the contact part of the control plate 502 and the guide part 65, the sliding resistance of the control plate 502 and the guide part 65 becomes small. For this reason, the circular movement of the chain 11 is smoothly realized while the regulating plate 502 is in contact with the guide portion 65. In addition, the outer peripheral surface of the guide part 65 is not limited to an arc shape, and may be another curved shape.

  Further, in the present embodiment, the reinforcing rib 503 is disposed at the base end portion of the restriction plate 502. For this reason, since the fall of the regulation plate 502 with respect to the plate main body 501 is suppressed, the contact part of the regulation plate 502 and the cutter post 6 is stably maintained. As a result, the rotation of the second cutter bit plate 50B around the axis extending along the circumferential direction is stably regulated.

  Further, since the relationship of L ≧ d × 2.5 is satisfied between the maximum width L of the second excavation bit 12B in FIG. 6 and the width d of the cutter post 6 in FIG. Even when excavating a wide region, the second cutter bit plate 50B is restricted from rotating around the axis extending along the circumferential direction while stably performing the circular movement of the chain 11 and the advancement of the cutter post 6. The

  Further, the excavation method according to the present embodiment is an endless chain supported by the cutter post 6 so that the outer peripheral surface of the predetermined cutter post 6 can move in a predetermined circumferential direction along a predetermined circumferential surface. 11 and the plate body 501 including the front surface and the back surface, and at least both ends of the surface of the plate body 501 in the width direction of the chain 11 orthogonal to the circumferential surface and the circumferential direction, A plurality of first cutter units 10 </ b> A and second cutter units each provided with a plurality of first drill bits 12 </ b> A and second drill bits 12 </ b> B facing each other and fixed to the surface of the chain 11 at intervals along the circumferential direction. 10B is an excavation method in which continuous grooves are integrally moved to form continuous grooves in the ground. In the excavation method, a pair of restricting plates 502 that are disposed on both sides of the chain 11 in the width direction of the chain 11 and extend from the back surface of the plate main body 501 are accompanied by the circular movement of the chain 11 and the cutter bit plate 50. The ground M is excavated by the second excavation bit 12B while restricting the second cutter unit 10B from rotating around the axis extending in the circumferential direction by contacting the cutter post 6.

  Further, in the above excavation method, the restriction plate 502 is tilted with respect to the plate body 501 in a cross section orthogonal to the circumferential direction by the reinforcing rib 503 arranged at the base end portion of the restriction plate 502 and connecting the restriction plate 502 and the plate body 501. The natural ground M is excavated by the second excavation bit 12B.

  According to such an excavation method, the rotation of the second cutter bit plate 50B around the axis extending along the circumferential direction is restricted. For this reason, it becomes possible to make small the shear force concerning the shoe volt | bolt S1 which fixes the 2nd cutter bit plate 50B.

  Further, in the excavation method, when the width of the cutter post 6 in the width direction is d, and the interval in the width direction between the second excavation bits 12B arranged at both ends of the second cutter bit plate 50B is L, The widths of the cutter post 6 and the second cutter bit plate 50B and the arrangement of the second excavation bits 12B are set so that the relationship of L ≧ d × 2.5 is satisfied.

  According to such an excavation method, even when excavating a wide region with respect to the natural ground, the shearing force applied to the shoe bolt S1 is stably performed while the circular movement of the chain 11 and the advance of the cutter post 6 are stably performed. It can be made smaller.

  Next, a trench excavator according to a second embodiment of the present invention and a ground excavation method using the same will be described. The present embodiment is mainly different from the first embodiment in the structure of the second cutter bit plate 50B. Therefore, the description will focus on the difference, and the description of other common points will be omitted. To do. Moreover, in the following description, the same code | symbol is attached | subjected and demonstrated about the member provided with the same structure and function as the member which concerns on previous 1st Embodiment.

  FIG. 14 is a cross-sectional view of the cutter post 6 and the chain 11 of the groove excavator 1 according to the present embodiment. FIG. 15 is an enlarged front view of a part of the chain 11 of the groove excavator 1, and FIG. 16 is an enlarged side view of a part of the chain 11 of the groove excavator 1. FIG. 17 is a cross-sectional view of the chain 11 and the second cutter bit plate 50 </ b> B of the groove excavator 1.

  Referring to FIG. 14, the cutter post 6 includes a pair of side walls 60, a pair of support walls 61 that connect the pair of side walls 60, a pair of opposing walls 62, a sliding portion 63, and a cutter post convex portion 64. And comprising. In FIG. 14, the end portion on the front end side of the cutter post 6 is shown in an enlarged manner, but the support wall 61, the opposing wall 62, and the sliding portion similar to those in FIG. 14 are also provided on the rear end side of the cutter post 6. 63 and the cutter post convex part 64 are arrange | positioned.

  The support wall 61 is a wall surface that supports the chain cutter 10 in the cutter post 6. The pair of opposing walls 62 are wall portions arranged so as to protrude forward from both end portions in the left-right direction of the support wall 61. The chain 11 is accommodated between the pair of opposing walls 62. The pair of sliding portions 63 are plate-like members fixed to the support wall 61 inside the pair of opposing walls 62. For the sliding portion 63, a member having low frictional resistance and high slidability is used. The cutter post convex portion 64 is a protrusion protruding from the support wall 61 between the pair of sliding portions 63. The cutter post convex portion 64 is disposed between the pair of links 110A. The opposing wall 62, the sliding portion 63, and the cutter post convex portion 64 extend long over the entire vertical direction of the cutter post 6 and have a function of guiding the circular motion of the chain 11.

  As shown in FIGS. 14 and 17, the pair of links 110 </ b> A and the fixing pin 150 have a substantially H shape when viewed in a cross section orthogonal to the circumferential movement direction of the chain 11. Each of the pair of links 110A includes a link convex portion 110S and a link sliding surface 110T. The link protrusion 110S is a region protruding higher than the facing wall 62 in the link 110A. A plate support surface X is formed on the front end surface (outer peripheral surface) of the link convex portion 110S. The plate support surface X has a function of supporting the cutter bit plate 50. The link sliding surface 110T is a base end surface of the link 110A, and slides with the sliding portion 63 as the chain 11 rotates.

  15 and 16, the region where the links 110 </ b> A are arranged on both sides of one half link 110 </ b> B in the chain 11 is shown in an enlarged manner. As described above, the link 110 </ b> A and the half link 110 </ b> B are connected to each other by the fixing pin 150. For this reason, pin insertion portions SP into which the fixing pins 150 are inserted are formed at both ends of the link 110A and the half link 110B (FIG. 16). Further, the link 110A includes the plate support surface X, the link hole SK, and the shoe bolt hole SH. The link hole portion SK is opened between the pair of pin insertion portions SP in the circumferential direction of the chain 11. The shoe bolt hole SH is a bolt fastening hole extending from the link hole SK to the plate support surface X.

  On the other hand, referring to FIG. 17, the second cutter bit plate 50B fixed to the chain 11 includes a plate main body 501, a plate center convex portion 505 (inner protruding portion), and a plate side convex portion 506 (outer protruding portion). And the aforementioned second excavation bit 12B.

  The plate body 501 is a plate-like portion that extends longer than the chain 11 in the width direction (left-right direction) of the chain 11, and includes a surface facing the ground and a back surface opposite to the surface. The second excavation bit 12B is fixed to both ends of the surface of the plate body 501. A supported surface Y is formed on the back surface of the plate body 501 (the rear side surface of FIG. 17). The supported surface Y is a flat surface extending in the left-right direction, and is in contact with and supported by the plate support surface X (outer peripheral surface) of the chain 11. The plate center convex portion 505 is a protrusion that protrudes from the center in the left-right direction of the supported surface Y. The plate side protrusions 506 are a pair of protrusions protruding from the supported surface X so as to face the plate center protrusion 505 in the width direction (left-right direction) of the chain 11. The pair of plate side convex portions 506 are respectively disposed at a predetermined interval with respect to the plate central convex portion 505. The plate side convex portion 506 is disposed so as to sandwich the pair of links 110 </ b> A in the width direction with the plate central convex portion 505.

  Referring to FIG. 15, the mounting position of the second cutter bit plate 50B is indicated by a one-dot chain line around the pair of links 110A above the half link 110B. When the second cutter bit plate 50B is attached to the chain 11, the plate center convex portion 505 is inserted into the space between the pair of links 110A. At this time, the outer surface 505A of the plate center convex portion 505 is in surface contact with the inner side surface extending in the circumferential direction of the pair of links 110A in the width direction. On the other hand, the pair of plate side convex portions 506 holds the pair of links 110A along the width direction (left-right direction) together with the plate central convex portion 505, and the inner side surfaces 506A of the pair of plate side convex portions 506 are paired with each other. Surface contact is made in the width direction with respect to the outer surface extending along the circumferential direction of the link 110A. As a result, the pair of plate side convex portions 506, the pair of links 110A, and the plate central convex portion 505 are disposed in close contact with each other along the width direction (left and right direction) of the chain 11. Further, as shown in FIG. 17, the supported surface Y of the second cutter bit plate 50 </ b> B is supported by the plate support surface X of the chain 11.

  When the second cutter bit plate 50B is attached to the pair of links 110A, the shoe bolt S1 is inserted into the bolt hole ST of the cutter bit plate 50 as shown in FIG. The tip of the shoe bolt S1 passes through the shoe bolt hole SH of the chain 11 and is exposed to the link hole SK. The second cutter bit plate 50B is fixed to the chain 11 by attaching and fixing the nut S2 inserted into the link hole SK from the side of the chain 11 by the operator to the tip of the shoe bolt S1. As described above, the second cutter bit plate 50B is fixed to the chain 11 by four shoe bolts S1 and nuts S2, respectively (FIG. 15). At this time, the shoe bolt S1 and the nut S2 connect the chain 11 and the second cutter bit plate 50B to the chain 11 so that the outer peripheral surface of the chain 11 (band bodies 11A and 11B) and the back surface of the plate body 501 are pressed against each other. Fastening is performed along a direction (front-rear direction) that is parallel to the circumferential surface and orthogonal to the width direction of the chain 11.

  In the present embodiment, the second cutter bit plate 50B of the second cutter unit 10B is fixed to the chain 11 with a structure as shown in FIG. On the other hand, the first cutter bit plate 50A of the first cutter unit 10A does not include the plate center convex portion 505 and the plate side convex portion 506 in FIG. That is, a flat supported surface Y is formed along the left-right direction on the back side of the first cutter bit plate 50A. Also in this case, the first cutter bit plate 50A is fixed to the chain 11 by the four shoe bolts S1 and the nut S2 in the same manner as described above. At this time, the supported surface Y of the first cutter bit plate 50 </ b> A is supported by the plate supporting surface X of the chain 11.

  As described with reference to FIG. 20 in the first embodiment, when the maximum width of the second excavation bit 12B of the second cutter bit plate 50B is set larger than the width d of the cutter post 6. Since the excavated earth and sand flow (arrow DJ) becomes smooth, excavation work with a wide excavation width W can be performed smoothly. And when maximum width L (Drawing 6) of a pair of 2nd excavation bits 12B of the 2nd cutter bit plate 50B is 1000 mm or more, the above-mentioned relation of L> = dx2.5 is satisfied. The effect is greatly expressed. On the other hand, when such a structure is adopted, as described above, the rotational moment related to the second cutter bit plate 50B and the shearing force to the shoe bolt S1 become a problem.

  In order to solve such a problem, in this embodiment, in addition to the structure of the restriction plate 502 (FIG. 9) described in the first embodiment, the second cutter bit plate 50B is as shown in FIGS. It has a structure. That is, when the second cutter bit plate 50B circulates around the cutter post 6 together with the chain 11 while excavating the natural ground M, the outer surface 505A of the plate center convex portion 505 closely contacts the inner surface of the link 110A. ing. Further, the inner side surfaces 506A of the pair of plate side convex portions 506 are in close contact with the outer side surfaces of the links 110A. During the excavation of the natural ground, the moment (arrow DT in FIG. 6) that the second cutter bit plate 50B rotates in a plane parallel to the plate body 501 due to the reaction force R received by the second excavation bit 12B from the natural ground. Even if this is likely to occur, the rotation of the cutter bit plate 50 is restricted by the contact between the outer surface 505A of the plate center convex portion 505 and the inner surface of the link 110A (the pair of strips 11A and 11B). For this reason, it becomes possible to make small the shear force concerning the shoe volt | bolt S1 which fixes the cutter bit plate 50. FIG. As a result, the shoe bolt S1 can be prevented from being loosened, detached or damaged. In other words, in the present embodiment, the outer side surface 505A of the plate center convex portion 505 is located within the link 110A so as to suppress the rotation of the second cutter bit plate 50B in the cross section orthogonal to the circumferential movement direction of the chain cutter 10. The inner side surfaces of the pair of plate side convex portions 506 are in close contact with the outer side surface of the link 110A.

  Also in the present embodiment, as shown in FIGS. 6 and 7, the second cutter bit plates 50 </ b> B are arranged so as to be in close contact with and sandwiched by the pair of scram plates 115. For this reason, a rotational moment as shown by the arrow DT in FIG. 6 is more unlikely to occur with respect to the second cutter bit plate 50B.

  In the present embodiment, as shown in FIG. 17, the contact portion between the plate center convex portion 505 and the link 110A and the contact portion between the plate side convex portion 506 and the link 110A are respectively in the front-rear direction and the vertical direction. The surface is set to have a predetermined length in the direction (surface contact). For this reason, a rotational moment as shown by the arrow DS in FIG. 20 is unlikely to occur with respect to the second cutter bit plate 50B. As a result, the shear force applied to the shoe bolt S1 can be reduced, and the occurrence of loosening, disconnection, breakage, etc. of the shoe bolt S1 is further suppressed.

  Further, as shown in FIG. 15, the plate center convex portion 505 of the second cutter bit plate 50B is set to have a shape that fits into the space between the pair of links 110A. Therefore, the operator can easily attach the second cutter bit plate 50B to a predetermined position of the chain 11. Further, since the plate center convex portion 505 fits in the space between the links 110A of the chain 11 and the pair of plate side convex portions 506 fits outside the pair of links 110A, the shape of the chain 11 is regulated. The slack of the is suppressed. At this time, the end surfaces orthogonal to the pair of outer side surfaces 505A in the plate center convex portion 505 are arranged to face the fixing pins 150 (FIG. 15).

  Furthermore, in this embodiment, the cutter bit plate 50 including the excavation bit 12 is directly attached to the chain 11. For this reason, it becomes possible to reduce the weight of the chain type cutter 10 as compared with the case where another positioning member is arranged between the cutter bit plate 50 and the chain 11, and the chain 11 can be moved to the chain 11 during the circular movement. Such a load can be reduced.

  Furthermore, also in this embodiment, the relationship of L ≧ d × 2.5 is satisfied between the maximum width L of the second excavation bit 12B in FIG. 6 and the width d of the cutter post 6 in FIG. Thus, even when excavating a wide area in the ground, it is possible to reduce the shearing force applied to the shoe bolt S1 while stably performing the circular movement of the chain 11 and the advancement of the cutter post 6.

  As described above, the second cutter bit plate 50B according to the present embodiment includes a pair of endless strips 11A and 11B arranged at intervals in a predetermined width direction, and the strips 11A and 11B. A fixed pin 150 that couples the pair of strips 11A and 11B to each other so as to keep the distance between them constant, and moves on the outer periphery of a predetermined cutter post 6 in a predetermined circumferential direction along a predetermined circumferential surface It fixes to the outer peripheral surface of the endless chain 11 supported by the cutter post 6 as possible. The second cutter bit plate 50B extends longer than the chain 11 along the width direction of the chain orthogonal to the circumferential surface of the chain 11 and the circumferential direction of the chain 11, and includes a plate body 501 including a front surface and a back surface, A space between the pair of belt bodies 11A and 11B that protrude from the back surface of the plate body 501 and a plurality of second excavation bits 12B that are disposed at least at both ends in the width direction on the surface of the plate body 501 and face the underground ground. And a plate center convex portion 505 including a pair of outer side surfaces 505A each in surface contact with an inner side surface extending along the circumferential direction of the pair of band bodies 11A and 11B. Then, the second cutter bit plate 50B is fastened to the chain 11 along a direction parallel to the circumferential surface of the chain 11 and perpendicular to the width direction of the chain 11 by a plurality of shoe bolts S1 and nuts S2. As a result, the outer peripheral surface of the chain 11 and the back surface of the plate body 501 are pressed against each other.

  Furthermore, the second cutter bit plate 50B according to the present embodiment is a pair that protrudes from the back surface of the plate body 501 so as to sandwich the pair of belt bodies 11A and 11B in the width direction of the chain 11 between the plate central convex portion 505. And a pair of plate-side convex portions 506 each including an inner side surface 506A in surface contact with an outer side surface extending along the circumferential direction of the pair of band bodies 11A and 11B.

  In addition, the excavation method according to the present embodiment includes a pair of endless strips 11A and 11B arranged at intervals in a predetermined width direction, and a pair of strips so as to keep the spacing between the strips constant. A plate including an endless chain 11 that moves in a predetermined circumferential direction along a predetermined circumferential surface orthogonal to the width direction, and a front surface and a back surface. A main body 501 and a plurality of second excavation bits 12B disposed at both ends of the surface of the plate main body 501 and facing the underground ground, respectively, on the outer circumferential surface of the chain 11 along the circumferential direction of the chain In this excavation method, a plurality of second cutter bit plates 50B fixed at intervals are integrally moved around a predetermined cutter post 6 to form continuous grooves in the ground. The excavation method includes a preparation process and an excavation process. In the preparation step, the plate central convex portion 505 protruding from the back surface of the plate body 501 of the second cutter bit plate 50B enters the space between the pair of belt bodies 11A and 11B, and follows the circumferential direction of the plate central convex portion 505. The second cutter bit plate 50B is fitted into the chain 11 so that the pair of outer side surfaces 505A extending in surface contact with the inner side surfaces extending along the circumferential direction of the pair of band members 11A, 11B, respectively, A plurality of shoe bolts S1 and nuts are arranged along the direction parallel to the circumferential surface and perpendicular to the width direction so that the outer peripheral surface of 11B and the rear surface of the plate body 501 are pressed against each other. Fasten by S2. In the excavation process, the chain 11 is moved around the cutter post 6 and the cutter post 6 is moved along a predetermined traveling direction. The second cutter bit plate is caused by the reaction force R received by the second excavation bit 12B from the natural ground. The second excavation bit 12B regulates the rotation of 50B in a plane parallel to the plate body 501 by the contact between the outer surface 505A of the plate center convex portion 505 and the inner surfaces of the pair of strips 11A and 11B. Drill natural ground.

  Further, in the above preparation step, the pair of plate side protrusions 506 projecting from the back surface of the plate body 501 with a gap on both sides in the width direction with respect to the plate center protrusion 505 is between the plate center protrusion 505. The inner side surfaces 505A extending between the pair of belt bodies 11A and 11B in the width direction and extending along the circumferential direction of the pair of plate central protrusions 505 are respectively facing the outer surfaces extending along the circumferential direction of the pair of belt bodies. The second cutter bit plate 50B is fitted into the chain 11 so as to come into contact, and the chain 11 and the second cutter bit plate 50B are fastened by a plurality of shoe bolts S1. In the excavation process, the second cutter bit plate 50B is rotated in a plane parallel to the plate body 501 by the reaction force R received by the second excavation bit 12B from the natural ground. The ground is excavated by the second excavation bit 12B while further regulating by the contact between the side surface 506A and the outer surfaces of the pair of strips 11A, 11B.

  According to such excavation method, the moment is applied to the second cutter bit plate 50B during excavation of the natural ground, and the second cutter bit plate 50B includes the circumferential direction of the chain 11 and the width direction of the chain 11. A moment that rotates in a plane can be reduced. For this reason, it becomes possible to make small the shear force concerning the shoe volt | bolt S1 which fixes the 2nd cutter bit plate 50B.

  Further, in the excavation method, when the width of the cutter post 6 in the width direction is d, and the interval in the width direction between the second excavation bits 12B arranged at both ends of the second cutter bit plate 50B is L, The widths of the cutter post 6 and the second cutter bit plate 50B and the arrangement of the second excavation bits 12B are set so that the relationship of L ≧ d × 2.5 is satisfied.

  According to such an excavation method, even when excavating a wide region with respect to the natural ground, the shearing force applied to the shoe bolt S1 is stably performed while the circular movement of the chain 11 and the advance of the cutter post 6 are stably performed. It can be made smaller.

  Heretofore, the groove excavator 1 according to each embodiment of the present invention and the ground excavation method using the same have been described. The present invention is not limited to these forms. In the present invention, the following modified embodiments are possible.

  (1) In the first embodiment, as shown in FIG. 9, the outer peripheral surface of the guide portion 65 has been described as having an arc shape (curved shape). However, the present invention is not limited to this. Absent. The outer peripheral surface of the guide part 65 may be a flat surface, and the above-described arc shape may be formed on the side surface of the regulation plate 502 that contacts the guide part 65. Alternatively, a protrusion having a shape similar to that of the guide portion 65 may be disposed on the regulation plate 502 side, and the protrusion may be in direct contact with the side wall 60 of the cutter post 6. That is, at the contact portion where the restriction plate 502 and the cutter post 6 of the second cutter bit plate 50B abut, at least one of the restriction plate 502 and the cutter post 6 has a curved shape (arc) that is convex toward the other. (Shape) is desirable.

  FIG. 18 is a cross-sectional view of the cutter post 6M and the chain cutter 10M of the groove excavator according to a modified embodiment of the present invention. As shown in FIG. 18, in this modified embodiment, a pair of restriction plates 507 extend from the back surface of the plate body 501. The pair of regulation plates 507 are arranged so as to sandwich the chain. The tip of the restriction plate 507 has a hemispherical shape. In addition, a plurality of reinforcing ribs 508 are arranged at the base end portion of the regulating plate 507. The regulating plate 507 has a regulated surface 507H.

  On the other hand, the cutter post 6 </ b> M includes a pair of guide portions 66 (protruding portions) disposed on the side wall 60. The guide part 66 includes a regulation surface 66H. In FIG. 18, since the forward path and the return path in the circular movement are shown, two pairs of guide portions 66 appear. The pair of guide portions 66 facing the chain cutter 10M are arranged so as to extend from the pair of side walls 60 along the width direction of the chain 11, respectively. The guide part 66 includes a regulation surface 66H. The regulated surface 507H of the regulating plate 507 contacts the regulating surface 66H of the guide portion 66 along a direction (front-rear direction) that is parallel to the circumferential surface of the chain 11 and orthogonal to the width direction of the chain 11.

  In such a configuration, the direction of the reaction force R (FIG. 20) that the cutter bit plate 50 </ b> M receives from the natural ground M and the contact direction of the restriction plate 507 with respect to the guide portion 66 are set substantially parallel. For this reason, rotation of the cutter bit plate 50M around the axis extending along the circumferential direction is more stably regulated.

  (2) Further, in each of the above embodiments, the first cutter bit plate 50A has been described in a mode that does not include the restriction plate 502 and the reinforcing rib 503 unlike the second cutter bit plate 50B. It is not limited to this. Also in the first cutter bit plate 50A, the rotation of the first cutter bit plate 50A can be restricted by providing shapes such as the restriction plate 502 and the reinforcing rib 503.

  (3) In the second embodiment described above, the second cutter bit plate 50B has been described as having the plate center convex portion 505 and the plate side convex portion 506, but the present invention is limited to this. is not. The second cutter bit plate 50B may include only the plate center convex portion 505, or may include only the pair of plate side convex portions 506. FIG. 19 is a cross-sectional view showing a state in which the cutter bit plate 50M according to a modified embodiment of the present invention is fixed to the chain 11. In this modified embodiment, as compared with the second cutter bit plate 50B of the previous embodiment, a pair of plate inner convex portions 509 (inner protruding portions) are arranged instead of the plate central convex portion 505. Is different. Also in such a case, the outer surfaces of the pair of plate inner protrusions 509 abut (surface contact) along the circumferential direction of the chain 11 with respect to the inner surface of the link 110A. For this reason, a rotational moment as shown by the arrow DT in FIG. 6 is unlikely to occur with respect to the cutter bit plate 50M. For this reason, it becomes possible to make small the shear force concerning shoe volt | bolt S1, and generation | occurrence | production of loosening, detachment | rupture, etc. of shoe volt | bolt S1 is suppressed.

DESCRIPTION OF SYMBOLS 1 Groove excavator 2 Crawler 3 Lower traveling body 4 Upper turning body (device main body)
5 Leader 6 Cutter post (support)
7 Rotation drive (chain drive)
8 Drive roller 9 Idler roller 10 Chain cutter 10A First cutter unit 10B Second cutter unit 11 Chain 110A Link 110B Half link 11A, 11B Band 115 Scram plate 12 Excavation bit (excavation blade)
12A 1st excavation bit 12B 2nd excavation bit 13 Portal frame 14 Traverse upper cylinder (support body drive part)
150 Fixing pin (connection member)
15 Traverse lower cylinder (support drive unit)
16, 17 Backstay 18 Cabin 50 Cutter bit plate (Drilling blade plate)
501 Plate body 502, 507 Restriction plate 503, 508 Reinforcement rib 505 Plate center convex part (inner protrusion part)
506 Plate side protrusion (outside protrusion)
509 Plate inner convex part (inner protrusion)
50A First cutter bit plate 50B Second cutter bit plate 51 Half link plates 65, 66 Guide portion (protruding portion)
M ground mountain S1 shoe bolt (fastening member)
ST Bolt hole

Claims (8)

A drilling rig that forms continuous grooves in the ground,
A device body arranged on the ground;
A support suspended from the device body and disposed in the ground;
An endless chain supported by the support so as to be movable in a predetermined circumferential direction along a predetermined circumferential surface on the outer periphery of the support;
A plurality of excavation blade plates fixed to the outer circumferential surface of the chain at intervals along the circumferential direction of the chain, the width direction of the chain orthogonal to the circumferential surface of the chain and the circumferential direction of the chain, respectively A plate main body that extends longer than the chain and includes a front surface and a back surface, and a plurality of excavating blades that are disposed at least at both ends in the width direction on the front surface of the plate main body and face the underground ground And a plurality of excavation blade plates that excavate the natural ground by moving around the chain integrally with the chain, and
A plurality of fastening members that fasten the chain and the excavation blade plate along the direction parallel to the circumferential surface and perpendicular to the width direction so that the outer peripheral surface of the chain and the back surface of the plate body are pressed against each other When,
A chain drive unit for moving the chain in a circular direction along the circular direction;
A support driving unit that moves the support along a predetermined traveling direction;
Have
The support is provided with a pair of regulating surfaces that are spaced apart from each other in the width direction and continuously extend along the circumferential direction,
The excavation blade plate is a pair of restricting members that are disposed at positions on both sides of the chain in the width direction and extend from the back surface of the plate body, and the axis that the excavation blade plate extends along the circumferential direction A pair of regulating members each including a regulated surface capable of contacting the regulating surface of the support at an arbitrary position in the circumferential direction so as to regulate rotation around
The support is
A pair of support walls for supporting the chain so as to be capable of circular movement;
A pair of side walls respectively connected to both ends in the width direction of the pair of support walls and provided with the restriction surfaces;
Having a box shape with
The pair of restricting members extend from the back surface of the plate body to the position facing the side wall over the support wall of the support body in parallel with the circumferential surface, and the support body in the width direction. It is arranged to sandwich,
The pair of restricting surfaces of the support are arranged to face the outside in the width direction, respectively.
The pair of regulated surfaces is an excavator that is arranged to face the outside in the width direction with respect to the regulating surfaces. The side wall
The base surface,
A protrusion that protrudes outward in the width direction from the base surface, extends along the circumferential direction, and includes the restriction surface;
The excavator according to claim 1, comprising: In a cross section perpendicular to the circumferential direction, one of said restricting surface of the object to be regulating surface and the support of the regulating member is provided with a convex curved shape toward the other, to claim 1 or 2 The drilling rig described.   4. The fall control member according to claim 1, further comprising a fall regulation member that is disposed at a proximal end portion of the regulation member and regulates the fall of the regulation member with respect to the plate body in a cross section orthogonal to the circulation direction. 5. Drilling rig.   When the width of the support in the width direction is d and the distance in the width direction between the excavating blades arranged at both ends of the excavating blade plate is L, the relationship of L ≧ d × 2.5 is satisfied. The excavator according to any one of claims 1 to 4, wherein the excavator is provided. In an outer peripheral surface of a predetermined support body having a box shape including a pair of support walls and a pair of side walls respectively connected to both ends of the pair of support walls, in a predetermined circumferential direction along a predetermined circumferential surface An endless chain supported by the pair of support walls of the support so as to be movable;
A plate main body including a front surface and a back surface; and a plurality of surfaces disposed at both ends of the front surface of the plate main body in the width direction of the chain orthogonal to the circumferential surface and the circumferential direction, respectively, and opposed to underground grounds. A plurality of excavating blade plates, each having a plurality of excavating blade plates fixed to the outer peripheral surface of the chain at intervals along the circumferential direction;
Is a drilling method for forming a continuous groove in the ground by integrally moving around,
In the width direction of the chain, the circumferential surface is disposed at positions on both sides of the chain from the back surface of the plate body of the excavation blade plate to the position facing the side wall across the support wall of the support. A pair of restricting members extending in parallel with each other come into contact with the support body as the chain and the excavation blade plate rotate, so that the excavation blade plate rotates about an axis extending in the circumferential direction. The excavation method which has the excavation process which excavates the said natural ground with the said excavation blade, restricting.   The ground is excavated by the excavating blade while the tilting of the regulating member with respect to the plate body in the cross section orthogonal to the circumferential direction is regulated by the member arranged at the base end portion of the regulating member and supporting the regulating member. The excavation method according to claim 6.   When the width of the support in the width direction is d and the distance in the width direction between the excavating blades arranged at both ends of the excavating blade plate is L, the relationship of L ≧ d × 2.5 is satisfied. The excavation method according to claim 6 or 7, wherein a width of each of the support body and the plate body and an arrangement of the excavation blades are set so that the support body and the plate main body are arranged.