JP5941949B2 - Removal method of buried structure - Google Patents

Description

  The present invention can be suitably implemented to cut an existing structure composed of a hollow structure made of concrete or reinforced concrete including environments such as sewer manholes and sewer pipes, which are also called human holes, and crush them into a plurality of pieces. The present invention relates to a method for removing a buried structure.

  As a construction method for repairing, replacing, and expanding sewer manholes, a buried laying construction method called an MDP (Minimum Digging Process) construction method is known, and this prior art is described in Patent Document 1, for example.

  In this prior art, a minimum retaining dimension, that is, a nominal diameter of φ2000 mm, φ1500 mm, φ1300 mm, φ900 mm, etc., is selected according to the field conditions, and after installing the casing, the soil is loosened and sucked with compressed air. The casing is lowered stepwise to the excavation surface by its own weight without swinging and rotating the casing. Since the casing is lowered while sucking the earth and sand exposed to the inner bottom of the casing in this way, even if there is an unexpected buried object such as a water pipe or a gas pipe that the operator does not grasp, the buried object is removed by the casing. After the casing is lowered to a predetermined depth, the buried object is repaired, replaced, expanded, etc. It is possible to backfill the space in the casing with a thickness of about 20 to 30 cm and compact it enough, restore the pavement, reduce the disturbance of the surrounding ground, and minimize the impact on the road pavement. It is. Moreover, since the amount of subsidence after backfilling is small, the pavement can be directly restored without temporary restoration work, thereby reducing the disposal soil and asphalt waste, and the construction period can be greatly shortened.

JP 2009-257013 A

  In the above-described prior art, by inserting the casing into the ground by its own weight, the inner bottom sediment is removed by excavation and suction, and after a predetermined treatment is performed on the work target, the casing is pulled out and backfilled. It is possible to renew, replace and expand buried objects with a reduced construction scope, but it is easy to reduce existing labor, including the environment such as sewer manholes and sewer pipes, with a short construction period and labor. Moreover, no technology that can be removed safely has been proposed, and such a technology is required.

  The objective of this invention is providing the removal method of the embedded structure which can shorten an construction period, can reduce an effort, and can remove an existing structure easily and safely.

The present invention has a cutting edge portion in a hollow existing structure made of reinforced concrete that is buried in the ground, the cutting edge portion advances in a direction close to the inner surface of the existing structure, and the cutting edge portion is an existing structure. A carry-in step of carrying in a cutting device comprising a cutting blade member that moves backward in a direction away from the inner surface of the object;
An axial direction perpendicular to the front-rear axis on a virtual plane including the front-rear axis and the front-rear axis parallel to the advancing and retreating direction by advancing the cutting blade member of the cutting device carried into the existing structure in the carrying-in process In addition, a cutting step of supporting the cutting device with the existing structure and cutting the existing structure with the cutting blade member;
A moving step in which the cutting device is moved back from the position where the existing structure is cut in the cutting step by moving the cutting blade member backward;
A crushing step of crushing an existing structure by repeating the cutting operation in the cutting step and the moving operation in the moving step,
The crushed existing structures that have been crushed by the crushing step, seen including a unloading step for unloading the ground,
The cutting step includes
A first cutting step of cutting an existing structure by a cutting blade member along a straight line extending in one direction on a virtual plane perpendicular to the longitudinal axis;
A second cutting step of cutting the existing structure with a cutting edge member along a straight line extending in the other direction perpendicular to one direction on a virtual plane perpendicular to the longitudinal axis . It is a removal method.

  In addition, the present invention further includes a press-fitting step of press-fitting a cylindrical earth retaining casing from the ground into the ground so as to surround the existing structure before the carrying-in step.

  According to the present invention, in the cutting step, the cutting device is supported by the existing structure in a state where the front-rear axis and the axis perpendicular to the front-rear axis are positioned perpendicular to the center axis of the existing structure. It is characterized by that.

The present invention also includes a camera that captures an area where the cutting edge of the cutting member of an existing structure faces,
A display device that is installed at a predetermined installation position on the ground and that displays an image of an area facing the blade edge portion captured by a camera;
The cutting device is moved to an uncut position in the moving step based on the image of the region facing the cutting edge displayed on the display device.

In the present invention, the cutting device further includes an irradiation device that irradiates the fan beam light toward a region where the blade edge part of the cutting blade member faces on the inner surface of the existing structure,
In the moving step, the cutting device is moved to the uncut position based on the light image of the fan beam light irradiated on the inner surface of the existing structure.

  According to the present invention, the cutting device is carried into the existing structure in the carrying-in process, and in the cutting process, the cutting blade member of the cutting device is advanced to cut the existing structure in the direction perpendicular to the longitudinal axis and the longitudinal axis. Further, after the cutting device is set to the uncut position, the cutting operation can be repeated again to break the existing structure. The crushed material thus crushed can be transported to the ground, and the existing structure can be quickly and easily crushed and removed easily and safely.

In the cutting step, in the first step, the existing structure is cut along a straight line extending in one direction on a virtual plane perpendicular to the front-rear axis, and a linear direction extending in the other direction perpendicular to the one direction on the virtual plane. Therefore, the reinforcing bars in the existing structure can be reliably broken and cut.

  Further, according to the present invention, since the earth retaining casing is press-fitted from the ground so as to surround the existing structure before the cutting device is carried into the existing structure, the existing structure is cut and crushed. After removing the object, the surrounding earth and sand are prevented from collapsing, and even when the sand and sand around the existing structure is low, the cutting device receives the reaction force at the time of cutting by the cutting device. Can be supported.

  According to the present invention, since the cutting device is positioned in the axial direction perpendicular to the longitudinal axis in addition to the longitudinal axis with respect to the existing structure, the cutting position by the cutting blade member may be inadvertently shifted. Thus, the desired cutting position can be accurately cut.

  Further, according to the present invention, the image captured by the camera is displayed on the display device, and the cutting device can be moved based on the displayed image. Therefore, even when the existing structure is dark, An operator of the cutting apparatus can easily and accurately recognize the cutting position.

  Further, according to the present invention, the fan beam light is applied to the inner surface of the existing structure, and the cutting device is moved to the uncut position based on the light image, so that the cutting position can be recognized more accurately.

It is the top view which looked at the cutting device 1 used with the removal method of the existing structure of one Embodiment of this invention from upper direction. It is the side view which looked at the cutting device 1 from the downward direction of FIG. It is the front view which looked at the cutting device 1 from the left of FIG. 1 is a perspective view of a cutting device 1. FIG. It is a perspective view which shows the structure of the cutting blade assembly 6 and its vicinity. 3 is an exploded perspective view of the cutting blade assembly 6. FIG. FIG. 6 is a simplified front view of the cutting blade assembly 6. These are the expanded sectional views seen from the cut surface line VIII-VIII of FIG. 4 is a plan view for explaining the configuration of an arm drive means 60. FIG. FIG. 6 is a partial perspective view for explaining the configuration of a link means 61. FIG. 6 is a partial perspective view for explaining the configuration of a link means 61. FIG. 6 is a partial perspective view for explaining the configuration of a link means 61. FIG. 6 is a partial perspective view for explaining the configuration of a link means 61. FIG. 3 is a partial perspective view showing the reaction force receiving support body 11 in a simplified manner. 2 is a hydraulic circuit diagram of the cutting device 1. FIG. 3 is a front view showing an operation control device 140 of the hydraulic oil supply device 113. FIG. It is a graph which shows the pressure change with respect to the time of the hydraulic fluid in the 1st and 2nd pipe lines 114 and 115 at the time of extrusion of the cutting blade member 5, and drawing-in. It is a figure which shows operation | movement of the cutting device 1 at the time of extrusion of the cutting blade member 5. FIG. It is a figure which shows operation | movement of the cutting device 1 at the time of drawing-in of the cutting blade member 5. FIG. It is a flowchart for demonstrating the operation | movement procedure of one Embodiment of this invention which concerns on the removal method of the existing structure. It is sectional drawing of the existing structure 3 made into object, and its vicinity. It is the top view which looked at the existing structure shown by FIG. 21 from upper direction. It is a figure which shows the state which installed the rotary press machine 160 according to the center of the existing structure 3. FIG. It is a figure which shows the state which installed the casing 161 for earth retaining on the existing structure 3. FIG. It is a figure which shows the state in which the earth retaining casing 161 was press-fitted to the trouble of the uppermost sewer pipe 163 connected to the existing structure 3 from the ground 162. It is a figure which shows the state in which the casing 161 for earth retaining was press-fitted by cut | disconnecting all the sewer pipes 163-166. It is a figure which shows the state which removed the cover 167 and the inclined wall 168 from the existing structure 3, and carried in the cutting device 1. FIG. It is a figure which shows the state which removed the fragment of the part cut | disconnected by the cutting device. It is a figure which shows the state by which the existing structure 3 was cut | disconnected by the cutting device 1 altogether. It is a figure which shows the state from which all the crushing pieces were removed. It is the top view which looked at the cutting device 1a used with the removal method of the existing structure of other embodiment of this invention from upper direction. It is a top view which shows the state which retracted each arm part support body 9a, 9b of the cutting device 1a. It is the side view which looked at the cutting device 1a from the downward direction of FIG. It is a perspective view of the cutting device 1a. It is a front view which shows the control apparatus 140a for operation of the hydraulic oil supply apparatus 113 used for the cutting device 1a of this embodiment. 14 is a perspective view showing a display device 177. FIG.

  FIG. 1 is a plan view of a cutting device 1 used in the method for removing an existing structure according to an embodiment of the present invention as viewed from above, and FIG. 2 is a side view of the cutting device 1 as viewed from below in FIG. 3 is a front view of the cutting device 1 as seen from the left side of FIG. 1, and FIG. 4 is a perspective view of the cutting device 1.

  The cutting device 1 according to the present embodiment includes a base 2 and a plate-shaped cutting blade member 5 having a blade edge portion 4 capable of cutting an existing structure 3 made of reinforced concrete. The base 2 has a forward direction A1 and a backward direction. A cutting blade assembly 6 movably provided on A2, and fixed to the base 2, and the cutting blade assembly 6 is moved in the aforementioned forward direction A1 where the blade edge portion 4 is close to the inner surface 3a of the existing structure 3, In addition, two double-acting cylinders 7a and 7b that move the blade edge portion 4 in the above-described backward direction A2 that is separated from the inner surface 3a of the existing structure 3, and the cutting blade assembly 6 on the base 2 are in the forward direction A1 and the backward direction A2. Is provided so as to be movable in a projecting direction B1 perpendicular to the longitudinal axis L1 parallel to the base 2 and away from the base 2, and in a retracting direction B2 perpendicular to the longitudinal axis L1 and close to the base 2, and the inner surface 3a of the existing structure 3 A pair having a support surface 8 capable of contacting Arm support members 9a and 9b, a reaction force receiving support member 11 that protrudes from the base member 2 on the base member 2 and has a reaction force receiving surface 10 that can contact the inner surface 3a of the existing structure 3, and each arm And a single double-acting cylinder 12 that moves the support members 9a and 9b in the extending direction B1 and the retracting direction B2.

  The existing structure 3 includes a plate-like auxiliary cutting blade member 14 having an auxiliary cutting edge portion 13 capable of cutting the existing structure 3, and the base 2 is below the above-described cutting blade assembly 6 (downward in FIG. 2). Adjacent to the auxiliary cutting edge assembly 15 provided so as to be movable in the forward direction C1 and the backward direction C2 along the front-rear axis L1, and the auxiliary cutting edge assembly 15 fixed to the base 2 to connect the auxiliary cutting edge assembly 15 to the auxiliary cutting edge portion 13. Further includes a double-acting cylinder 16 that moves in the aforementioned forward direction C1 approaching the inner surface 3a of the existing structure 3 and in the backward direction C2 in which the auxiliary cutting edge portion 13 is separated from the inner surface 3a of the existing structure 3.

  In the present embodiment, the existing structure 3 is a sewer manhole, and includes a slant wall to which a cast iron lid is attached and a plurality of straight walls. An invert to which pipes are connected is laid and closed by a bottom plate. Diagonal walls and multiple straight walls have different inner diameters and wall thicknesses depending on the number of manholes. From main reinforcing bars arranged in the vertical direction and helical reinforced concrete that is hardened by placing concrete. This is realized by a hollow frustum-shaped and cylindrical block body. FIG. 1 shows a cross section perpendicular to the axis of a straight wall, and its inner diameter is 1200 mm in the case of a No. 2 manhole, for example, and its wall thickness is 100 to 125 mm.

  The base 2 includes an upper structure portion 20, a lower structure portion 21, and an intermediate connection portion 22 that connects the upper structure portion 20 and the lower structure portion 21. The upper structure portion 20 includes a long plate-like bottom plate 23 and a rising plate 24 that rises vertically from one main surface of the bottom plate 23. The lower structure portion 21 includes a bottom plate 25 having a longitudinal plate shape similar to the bottom plate 23. The intermediate connecting portion 22 is composed of a rectangular plate member 26. The bottom plate 23, the rising plate 24, the bottom plate 25, and the plate member 26 are made of structural steel plates. One side portion of the plate-like member 26 is welded and joined to the other main surface of the bottom plate 23 of the upper structure portion 20. Further, the other side portion of the plate-like member 26 is welded and joined to the bottom plate 25 of the lower structure portion 21. The bottom plates 23 and 25 are connected in parallel by a plate-like member 26 with a space therebetween.

  A plurality of through holes 27 are formed in the rising plate 24 at intervals in the longitudinal direction at positions near the other side opposite to the one side joined to the bottom plate 23. In these through holes 27, a connecting tool 29 bound to one end of a plurality (2 in the present embodiment) of the hanging straps 28 is hooked.

  The connector 29 is also referred to as a U-bolt, and may be configured to include a bolt 31 and a nut 32 that is screwed to the U-shaped metal fitting 30. The hanging strap 28 is realized by, for example, a wire rope. A loop-shaped portion 33 is formed at the other end of each hanging strap 28, and each loop-shaped portion 33 is hung on a hook 35 provided at the lower end of a wire cable 34 suspended from a hanging work vehicle such as a crane. The cutting device 1 can be moved up and down in a suspended state by the operation of winding up or down the wire cable 34.

  FIG. 5 is a perspective view of the cutting device 1. The cutting blade assembly 6 includes a cutting blade member 5, a rotation mounting portion 40 that is rotatably held around the front / rear axis L <b> 1 by the two double-acting cylinders 7 a and 7 b, and the rotation mounting portion 40 includes the front and rear axis And a support member 41 rotatably connected around L1. The support member 41 is generally disk-shaped, and a stopper 42 is provided on one surface facing the cutting blade member 50 to limit the amount of rotation about the front-rear axis L1 of the rotation mounting portion 40.

  Each double-acting cylinder 7a, 7b is realized by a double-acting hydraulic cylinder having a maximum output of about 20 to 50 ton capable of cutting a reinforcing bar and a stroke of about 200 to 300 mm. Each double-acting cylinder 7a, 7b is fixed to the bottom plate 25 of the base 2 in plane symmetry with respect to the third virtual plane including the longitudinal axis L1 and the vertical axis L3. A support member 41 is fixed to each tip of each piston rod 7a1, 7b1 of each double-acting cylinder 7a, 7b with a bolt (not shown).

  6 is an exploded perspective view of the cutting blade assembly 6, FIG. 7 is a simplified front view of the cutting blade assembly 6, and FIG. 8 is an enlarged cross-sectional view taken along the cutting plane line VIII-VIII of FIG. 7. It is. FIG. 9 is a plan view for explaining the configuration of the arm driving means 60. The rotation mounting portion 40 includes a pair of substantially C-shaped holding members 43a and 43b, a rotation member 45, a pair of operation levers 46a and 46b, four mounting members 47, a plurality of bolts 51, And a plurality of nuts 52 screwed to each bolt 51.

  The rotating member 45 is made of a substantially disk-shaped steel plate, and a groove 39 that is retracted radially inward from the stopper 42 is formed at the peripheral edge. The groove 39 is formed over a first imaginary plane perpendicular to the front-rear axis L1 over a range of 90 ° around the front-rear axis L1, and limits the rotation range around the front-rear axis L1 of the rotation mounting portion 40 to 90 °. Then, the cutting blade member 5 can be tilted in the vertical direction parallel to the third virtual plane including the longitudinal axis L1 and the vertical axis L3 and in the horizontal direction perpendicular to the third virtual plane.

  Each attachment member 47 is made of a long plate-like steel plate extending in parallel to the front-rear axis L1, and is erected in parallel with each other in an axially symmetrical manner with respect to the front-rear axis L1. A plurality of bolt insertion holes 48 through which the shaft portions of the bolts 51 are inserted are formed in the mounting members 47 at intervals in the longitudinal direction. Further, a plurality of bolt insertion holes 49 through which the shaft portions of the bolts 51 are inserted are formed at both ends in the longitudinal direction (vertical direction in FIG. 6) of the respective holding members 43a and 43b.

  The cutting blade member 5 is formed with bolt insertion holes 53 through which the shaft portions of the bolts 51 are inserted at both ends in the longitudinal direction. The cutting blade member 5 is sandwiched between the sandwiching members 43a and 43b from both sides in the thickness direction, and is inserted between the sandwiching members 47 that form pairs on both sides with respect to the third virtual plane including the front and rear axis L1 and the left and right axis L2. The cutting blade member 5 is positioned in the direction of the longitudinal axis L1. In this state, the shaft 51 of the bolt 51 has the bolt insertion hole 48 of the two mounting members 47 arranged on one side with respect to the second virtual plane, the bolt insertion hole 49 of the clamping member 43b, and the bolt insertion hole of the cutting blade member 5. 53 is inserted through the bolt insertion hole 48 of the two mounting members 47 and the bolt insertion hole 49 of the holding member 43a arranged on the other side with respect to the second virtual plane, and the nut 52 is screwed and tightened. In this way, the cutting blade member 5 is attached to the rotating member 45 with high strength while being sandwiched between the sandwiching members 43a and 43b.

  As described above, since the cutting blade member 5 is attached to the rotating member 45 by the bolt 52 and the nut 52 while being sandwiched by the pair of sandwiching members 43a and 43b, the cutting edge portion 4 of the cutting blade member 5 is worn out. In addition, it can be easily replaced with a new cutting blade member.

  The rotation member 45 is formed with a bolt insertion hole 54 through which a shaft portion of the bolt 44 is inserted on a central axis parallel to the front-rear axis L1. A screw hole 55 is formed in the support member 41 on a central axis parallel to the front-rear axis L1. The screw hole 55 is a so-called tapping hole that is formed by tapping so that the male screw formed on the shaft portion of the bolt 44 is a female screw that can be engaged in the middle of tightening. The shaft portion of the bolt 44 is inserted through the annular washer 56 and further through the bolt insertion hole 54 of the rotation member 45 and is screwed into the screw hole 55 of the support member 41. The rotation member 45 is supported by the support member 41. While being in surface contact with each other, the screw 41 is screwed so as to be rotatable around a rotation axis that coincides with the central axis of the bolt 44.

  10 to 13 are partial perspective views for explaining the configuration of the link means 61. The cutting device 1 includes arm portion driving means 60 that moves the arm support bodies 9a and 9b in the extending direction B1 and the retracting direction B2.

  The arm drive means 60 includes the single double-acting cylinder 12 described above and the link means 61 driven by the double-acting cylinder 12. In the double acting cylinder 12, a piston (not shown) is accommodated in a cylinder case so as to be movable in the axial direction. A piston rod 62 is fixed to the piston, and the pressure balance between two pressure chambers in the cylinder case partitioned by the piston. Thus, the piston rod 62 can be extended or retracted. Such a double-acting cylinder 12 is realized by a double-acting hydraulic cylinder having a maximum output of about 5 tons and a stroke of about 150 mm.

  The link means 61 includes first to ninth link members 63 to 71 and first to ninth link pins 73 to 81. The first to ninth link members 63 to 71 and the first to ninth link pins 73 to 81 are made of steel. One end of the first link member 63 is rotatably connected to the tip of the piston rod 62 of the double-acting cylinder 12 by a first link pin 73. The other end of the first link member 63 is rotatably connected to one end of the second link member 64 by a third link pin 75. The other end of the second link member 64 is rotatably connected to one end of the third link member 65 by a fourth link pin 76.

  A second link pin 74 is fixed to an intermediate portion of the first link member 63. One end of a seventh link member 69 is fixed to the second link pin 74, and when the first link member 63 is angularly displaced by the expansion and contraction of the piston rod 62, the angular displacement is transmitted via the second link pin 74. Is transmitted to the seventh link member 69. The other end of the seventh link member 69 is rotatably connected to one end of the eighth link member 70 by an eighth link pin 80. The other end of the eighth link member 70 is fixed to the ninth link pin 81. One end portion of the ninth link member 71 is connected to the ninth link pin 81, and the other end portion of the ninth link member 71 is rotatably connected to the fixed arm 83 by the tenth link pin 82.

  The other end of the third link member 65 is fixed to the fifth link pin 77. One end of the fourth link member 66 is fixed to the fifth link pin 77. The other end of the fourth link member 66 is rotatably connected to the sixth link pin 78. The sixth link pin 78 is rotatably connected at one end of the fifth link member 67 and the other end of the fifth link member 67 is rotatably connected to the sixth link pin 78. The sixth link pin 78 is fixed to the arm support 9b. The ninth link pin 81 is fixed to the arm support 9a.

  One end of the first link member 63 is connected to the tip of the piston rod 62 by a first link pin 73. Such a first link pin 73 constitutes an input end connecting portion. The sixth link pin 78 and the ninth link pin 81 connected to the arm support bodies 9a and 9b constitute an output end connecting portion. The seventh link pin 79 is fixed to the fixed arm 84. The fourth link pin 76 is connected to the fixed arm 85, and the fifth link pin 77 is connected to the fixed arm 86. The base end portion of the double-acting cylinder 12 is rotatably supported by a hinge pin 87 so as to allow angular displacement due to expansion and contraction of the piston rod 62, and the hinge pin 87 is fixed to the base 2 by a bracket 88.

  When the piston rod 62 of the double-acting cylinder 12 is extended to the maximum length, the link means 61 has the fifth link pin 77 and the ninth link pin 81 that are two output end connecting portions, the base 2, A plurality of link members 66, 67, 69, 70, which are connected in a straight line on a second imaginary plane including the front-rear axis L 1 and the axis parallel to the extending direction B 1 and the retracting direction B 2. By adopting, it is possible to resist the compressive force from each arm support 9a, 9b without causing bending or the like. Therefore, a large bending stress is not generated in the link members 66, 67, 69, and 70. Therefore, it is not necessary to use a member having a high cross section, and the configuration can be simplified.

  In the structure of the link means 61 described above, the first link member 63, the second link member 64, and the third link member connected by the first link pin 73, the third link pin 75, the fourth link pin 76, and the fifth link pin 77. The link member 65 constitutes a drive link that transmits the displacement of the piston rod 62 of the double acting cylinder 12.

  The rotation of the second link pin 74 and the fifth link pin 77 transmitted by such a drive link causes the fourth link member 66 and the fifth link member 67 connected to and driven by the link pins 74 and 77. , Sixth link member 68, seventh link member 69, eighth link member 70, ninth link member 71 and sixth link pin 78, seventh link pin 79, eighth link pin 80, ninth link pin 81, It is transmitted to and driven by the upper driven link constituted by the 10 link pins 82, and is transmitted to the lower driven link similarly constructed by these, and the arm support bodies 9a and 9b are extended in the extending direction by the upper and lower two layers of links. It is configured to be able to be stably displaced in B1 and the pull-in direction B2.

  Referring also to FIG. 3 and FIG. 4, each arm support 9a, 9b includes a third virtual axis including an axis parallel to the extending direction B1 and the retracting direction B2, that is, the left and right axis L2, and the aforementioned front and rear axis L1. A longitudinal plate-like upper horizontal member 90 arranged in parallel to the plane, a longitudinal plate-like lower horizontal member 91 arranged in parallel below the upper horizontal member 90, and the lengths of the upper horizontal member 90 and the lower horizontal member 91 Longitudinal coupling members 92 and 93 that are joined to both ends in the direction by welding and extend parallel to the vertical axis L3 that is horizontal to the second virtual plane including the longitudinal axis L1 and the lateral axis L2.

  The surfaces facing the outer sides of the vertical connecting members 92 and 93 are the inner surfaces 3a of the existing structure 3 when the cutting device 1 is extended in the projecting direction B1 in the existing structure 3 and the arm support bodies 9a and 9b are extended. Function as support surfaces 94 and 95 which respectively contact with each other. The first link pin 73 and the ninth link pin 81 are joined to the upper horizontal member 90 by welding. In addition, a sixth link pin 78 and a ninth link pin 81 constituting the lower layer drive link are joined to the lower horizontal member 91 by welding.

  The fixed arms 85 and 86 are welded and joined to the both sides of the bottom plates 23 and 25 in the longitudinal direction, and one end portion of the seventh link member 69 constituting one driven link in the upper layer is the second portion. The link pin 74 is connected to the lower surface of one fixed arm 85. One end of the eighth link member 70 is connected to the lower surface of the one end of the seventh link member 69 by the eighth link pin 80. The other end of the eighth link member 70 is connected to the upper horizontal member 90 of one arm support 9a by a ninth link pin 81, and the ninth link member is placed on the other end of the eighth link member 70. One end of 71 is connected by a ninth link pin 81.

  Further, the fourth link member 66 constituting the other driven link in the upper layer is connected to the lower surface of the other fixed arm 86 by the fifth link pin 77. The other end of the fifth link member 67 is connected to the lower surface of the other end of the fifth link member 67 by a 6-link pin 78. The other end of the fifth link member 67 is connected to the upper horizontal member 90 of the other arm support 9b by a sixth link pin 78, and one end of the sixth link member 68 is connected to the sixth link pin 78 above the sixth link pin 78. Connected by pins 78.

  One end of the sixth link member 68 constituting one driven link in the lower layer is connected to the upper surface of one fixed arm 85 fixed to the lower horizontal member 91 by the second link pin 74. One end portion of the eighth link member 70 is connected to the upper surface of the other end portion of the seventh link member 69 by an eighth link pin 80, and the other end portion of the eighth link member 70 is horizontally lowered by a ninth link member 81. The lower end of the member 91 is connected, and one end portion of the ninth link member 71 is connected to the lower surface of the member 91 by a ninth link pin 81.

  Further, one end portion of the fourth link member 66 constituting the driven link in the lower layer is connected to the upper surface of the other fixed arm 86 fixed to the lower horizontal member 91 by the fifth link pin 77. One end of the seventh link member 69 is connected to the upper surface of the other end of the fourth link member 66 by a sixth link pin 78. The other end of the fifth link member 67 is connected to the upper surface of the lower horizontal member 91 by a sixth link pin 78, and one end of the sixth link member 68 is connected to the upper side thereof.

  In this way, the link means 61 is arranged in a direction in which the link members 69, 70, 66, 68 constituting the driven link in the upper layer and the lower layer are closer to each other as they approach the arm support 9a, 9b on the free end side. Therefore, the structure of the cutting device 1 can be reduced in the vertical axis L3 direction, and the size reduction is achieved.

  FIG. 14 is a partial perspective view showing the reaction force receiving support 11 in a simplified manner. The reaction force receiving support 11 is fixed to an end opposite to the end of the base 2 where the cutting blade assembly 6 is provided, and is an end plate 100 having a longitudinal plate shape extending in the vertical axis direction. , A plurality of sandwiching plates 101 provided so as to project perpendicularly to one main surface of the end plate 100, a longitudinal plate-like upper horizontal member 102 extending along the left-right axis L2, and a vertical axis L3 with respect to the upper horizontal member 102 A lower horizontal member 103 on a sandwich plate that is disposed in parallel with a gap in the direction and extends along the left and right axis L2, a square columnar bearing member 104 that extends along the vertical axis L3, an upper horizontal member 102, and Long plate-like vertical connecting members 105 and 106 for connecting the longitudinal ends of the lower horizontal member 103 are provided. The reaction force receiving surface 10 is constituted by the surfaces of the bearing members 104 and the vertical connecting members 105 and 106 facing outward.

  Since the reaction force receiving surface 10 is formed by the longitudinal pressure bearing member 104 and the vertical coupling members 105 and 106 on the vertical axis L3 as described above, a large pressure receiving area can be secured and the existing installation surface can be secured. Even when the structure 3 has already been crushed by cutting, the crushed pieces are supported together with surrounding uncut portions to prevent falling, and the double-action cylinders 7a and 7 and / or the double-action cylinder 16 at the time of cutting are supported. A large reaction force of about 50 to 60 tons or more can be distributed and received on a wide pressure receiving surface.

  Each sandwiching plate 101 is fixed to the end plate 100 with an interval in which the above-mentioned supporting pressure member 104 can be fitted in the direction of the left-right axis L2. A plurality of bolt insertion holes 107 are formed in each sandwich plate 101, and a shaft portion of a bolt 108 is inserted into each bolt insertion hole 107, so that a support member 104 fitted between the sandwich plates 101 is attached to the support member 104. Each clamping plate 101 and the pressure bearing member 104 are detachably connected to each other by being screwed into a formed screw hole (not shown). In this way, since the bearing member 104 is detachably provided on each clamping plate 101, and thus the end plate 100, by the bolt 108, when the bearing member 104 is deformed or damaged by a large reaction force, it is easily renewed. It can be exchanged for anything.

  Fixing arms 83 and 84 are welded, joined and fixed to the lower surface of the upper horizontal member 102. The other end portions of the sixth link member 68 and the ninth link member 71 are connected to the fixed arms 83 and 84 by a tenth link pin 82 and a seventh link pin 79, respectively.

  FIG. 15 is a hydraulic circuit diagram of the cutting device 1. The cutting device 1 includes a hydraulic oil supply device 113 for supplying hydraulic oil to the double acting cylinders 7a and 7b of the cutting edge driving means, the double acting cylinder 12 of the arm driving means, and the double acting cylinder 16 of the auxiliary cutting edge driving means. The first and second pipes 114 and 115 are connected to the two connection ports 111 and 112 provided in FIG. One connection port 111 is a high-pressure side connection port through which hydraulic oil having a pressure required for cutting is guided, and the other connection port 112 is a low-pressure side connection port through which hydraulic oil having a return control pressure is guided.

  The first pipeline 114 is constituted by a plurality of conduits 114a to 114d for supplying hydraulic oil to the piston chambers on the extrusion side of the double acting cylinders 7a, 7b; 12; 16, and the second pipeline 115 is a double acting. The cylinders 7a, 7b; 12; 16 are constituted by a plurality of conduits 115a to 115d for supplying hydraulic oil to the drawing-side piston chambers. These conduits 114a to 114d and 115a to 115d are realized, for example, by a hydraulic pressure-resistant rubber hose having flexibility.

  The hydraulic oil supply device 113 includes a tank 117 in which hydraulic oil is stored, an electric motor 118, a pump 119, a direction control valve 120, a first pressure control valve 121, a second pressure control valve 122, a first check valve 123, and a second. A check valve 124 and an on-off valve 125 are included.

  When the electric motor 118 is energized and the pump 119 is driven, the hydraulic oil in the tank 117 is pumped from the first flow path 126, and from the output port of the pump 119 through the second flow path 127, the direction control valve 120. To be supplied.

The direction control valve 120 is composed of a four-port three-position electromagnetic switching valve, and has a neutral position 113a, a push-out position 113b, and a return position 113c. Each of the positions 113a to 113c has four ports a, b, c, and d. It is done. The port b of the directional control valve 120 and the first connection port 111 are connected by a third flow path 128. A first pressure control valve 121 is interposed in the third flow path 128. As described above, the first pressure control valve 121 can be maintained in a state where high pressure hydraulic oil, for example, 240 kg / cm ² , which is a pressure necessary for cutting as described above, is supplied to the first connection port 111. Composed.

Further, the port d of the direction control valve 120 and the second connection port 112 are connected by a sixth flow path 131. A second pressure control valve 122 is interposed in the sixth flow path 131. The second pressure control valve 122 is set at a low pressure of, for example, 120 kg / cm ² , which is the above-described return control pressure, and the second connection port 112 is supplied with hydraulic fluid at the return control pressure. Configured to be able to be maintained.

  A fourth flow path 129 is connected to the third flow path 128, bypassing the first pressure control valve 121. A first check valve 123 is interposed in the fourth flow path 129 to form a return flow path when hydraulic oil is supplied from the first connection port 111 to the third flow path 128. The sixth flow path 131 is provided with a seventh flow path 132 branched so as to bypass the second pressure control valve 122. A second check valve 124 is interposed in the seventh flow path 132 to form a return flow path when hydraulic oil is supplied from the second connection port 112 to the sixth flow path 131.

  FIG. 16 is a front view showing the operation control device 140 of the hydraulic oil supply device 113. The hydraulic oil supply device 113 is provided with an operation control device 140 for controlling the operation of the electric motor 118 and the direction control valve 120. The operation control device 140 has a reverse U-shaped handle 141, both ends of the handle 141 are fixed by bolts, and a cover body 142 having a reverse U-shaped shape in front view and a cover body 142 are mounted. 143, and a connector 146 provided at the lower part of the control device main body 143 and to which a plug 145 of a flexible cable 144 configured to include a plurality of signal lines is detachably connected.

  The control device main body 143 includes a box-shaped metal housing 147, a power switch 148, a power lamp 149 that is turned on when power is turned off by the power switch 148, a start switch 150 for starting the motor 118, A stop switch 151 for stopping the start-up state of the electric motor 118 and an operation changeover switch 152 for pushing out the operation of the double-acting cylinders 7a, 7b;

  FIG. 17 is a graph showing the pressure change with time of the hydraulic oil in the first and second pipes 114 and 115 when the cutting blade member 5 is pushed out and retracted, and FIG. 18 is a graph showing when the cutting blade member 5 is pushed out. FIG. 19 is a diagram illustrating the operation of the cutting device 1, and FIG. 19 is a diagram illustrating the operation of the cutting device 1 when the cutting blade member 5 is retracted. In FIG. 17, FIG. 17 (1) shows the pressure change with respect to time of the hydraulic oil in the first pipe line 114 at the time of extrusion, and FIG. 17 (2) shows the time of hydraulic oil in the second pipe line 115 at the time of drawing. The pressure change with respect to is shown. In FIG. 18, FIG. 18 (1) shows a state in which the cutting device 1 is carried into the existing structure 3, and FIG. FIG. 18 (3) shows a state in which the arm support bodies 7 a and 7 b of the cutting device 1 are pressed against the inner surface 3 a of the existing structure 3. Further, in FIG. 19, FIG. 19 (1) shows a state where the cutting edge 4 of the cutting blade member 5 is pulled out from the wall after cutting the existing structure 3, and FIG. 19 (2) shows the cutting blade member 5 in the retracted position. The arm support bodies 7a and 7b are returned to the retracted positions.

  The removal work of the existing structure 3 is started and, as shown in FIG. 18 (1), the operator turns on the power supply of the operation control device 140 at time t0 in a state where the cutting device 1 is carried into the existing structure 3. When the switch 148 is turned on and the start switch 150 is pressed to turn it on, the electric motor 118 is driven, the pump 119 starts a pumping operation, and the pressure in the first pipe 114 is changed to the first pressure control valve 121. Increases to the first pressure P1, which is the set pressure. This first pressure P1 acts on the pressure-receiving surface facing one pressure chamber of the piston of each double-acting cylinder 7a, 7b, and the piston rod of each double-acting cylinder 7a, 7b expands, as shown in FIG. 18 (2). As shown, the cutting blade member 5 moves in the forward direction A1.

  The first pressure P1 also acts on the pressure receiving surface a11 facing one pressure chamber of the piston of the double acting cylinder 12 for overhanging, but the pressure receiving area a11 of one pressure receiving surface of the piston of each double acting cylinder 7a, 7b. Compared to the total value A11 (= a11 × 2), the overhanging double-acting cylinder 12 has a pressure receiving area A12 of one pressure-receiving surface of the piston that is one of the pistons of each of the double-acting cylinders 7a and 7b for cutting. Since the pressure receiving area A11 is smaller than the pressure receiving area A11 (A11> A12), the piston rod does not move in the extending direction, and therefore the arm support members 9a and 9b do not move in the extending direction B1.

  The cutting edge member 4 of the cutting blade member 5 is already installed at a time t1 when a short time from the time t0 until the cutting edge portion 4 of the cutting blade member 5 reaches the inner surface 3a of the existing structure 3, for example, about 2 to 5 seconds has elapsed. When the reaction force receiving support 11 comes into contact with the inner surface 3a of the structure 3 and a region opposite to the contact position of the cutting blade member 5 on the inner surface 3 of the existing structure 3, the cutting blade member 5 becomes Movement in the forward direction A1 is suppressed by the reaction force from the inner surface 3a. As a result, the pressure in the first pipe line 114 starts to rise, and when the pressure in the first pipe line 114 reaches the second pressure P2 higher than the first pressure P1 at time t2, the double acting cylinder 12 for overhanging As the piston rod extends, the arm support bodies 9a and 9b move in the extending direction B1, and the arm support bodies 9a and 9b support the inner surface of the existing structure 3 as shown in FIG. 18 (3). The cutting device 1 is fixed to the existing structure 3.

  The hydraulic oil is supplied to the first pipeline 114 from the first connection port 11 of the hydraulic oil supply device 113 at the third pressure that is the set pressure of the first pressure control valve 121, and at each time t4, each double-acting cylinder 7a. , 7b is extended to the maximum stroke, the pressure chamber in one of the double-acting cylinders 7a, 7b is maintained at the third pressure P3. Therefore, the existing structure 3 is cut at a pressure exceeding the second pressure P2 and not more than the third pressure P3 (P2 <P ≦ P3), depending on the strength of the existing structure 3 and the degree of wear of the cutting edge portion 4. .

  Next, as shown in FIG. 17B, the operation changeover switch 152 is “jacked” by the operator at time t6 to cut the existing structure 3 and move the cutting blade member 5 in the backward direction A2. When the switching operation is performed, the direction control valve 120 moves from the push-out position 133b to the return position 133c, enters the second pipe 115 from the second connection port 113 of the hydraulic oil supply device 113, and is larger than the first pressure P1. Hydraulic oil having a fourth pressure P4 lower than the second pressure P2 is supplied. Since each double-acting cylinder 9a, 9b and double-acting cylinder 12 have a smaller load difference than during extrusion, the piston rods are retracted almost simultaneously. As a result, as shown in FIG. 19 (1), the cutting blade member 5 starts moving in the backward direction A2, and then each arm support 9a, 9b moves in the retracting direction B2 as shown in FIG. 19 (2). When the operator returns the operation changeover switch 152 to the “neutral position” at time t7, the directional control valve 120 returns from the return position 133c to the neutral position 113a.

  FIG. 20 is a flowchart for explaining a work procedure according to an embodiment of the present invention relating to a method for removing an existing structure, and FIG. 21 is a cross-sectional view of the target existing structure 3 and the vicinity thereof. 21 is a plan view of the existing structure shown in FIG. 21 as viewed from above, FIG. 23 is a view showing a state where the rotary presser 160 is installed in alignment with the center of the existing structure 3, and FIG. It is a figure which shows the state which installed the casing 161 for earth retaining on the thing 3. FIG. FIG. 25 is a view showing a state in which the earth retaining casing 161 is press-fitted from the ground 162 to the trouble of the uppermost sewer pipe 163 connected to the existing structure 3, and FIG. It is a figure which shows the state press-fitted by cut | disconnecting the sewer pipes 163-166. FIG. 27 is a view showing a state in which the lid 167 and the inclined wall 168 are removed from the existing structure 3 and the cutting device 1 is carried in, and FIG. 28 is a state in which the fragmented pieces cut by the cutting device 1 are removed. FIG. 29 is a diagram illustrating a state in which the existing structure 3 is completely cut by the cutting device 1, and FIG. 30 is a diagram illustrating a state in which all the crushed pieces have been removed.

  In the press-fitting process of step s1, a cylindrical earth retaining casing 161 is press-fitted from the ground 162 as shown in FIGS. 24 to 26 by the rotary press-fitting machine 160 so as to surround the existing structure 3. The sewer pipes 163 to 166 are cut by the press-fitting of the earth retaining casing 161, and the construction can be performed with little or no influence on the surrounding natural ground.

  Next, in the carrying-in process of step s2, the manhole cover 167 and the inclined wall 168 are removed, and the above-described cutting device 1 is carried into the existing structure 3 embedded in the ground in step s3. Next, the cutting blade member 5 of the cutting device 1 carried into the existing structure 3 is advanced to cut the existing structure 3. In this cutting step, a first cutting step of cutting the existing structure 3 in step s4 along a straight line extending in one direction on the first virtual plane perpendicular to the front-rear axis L1 by the cutting blade member 5, and in step s5 A second cutting step of cutting the existing structure 3 by a cutting blade member 5 along a straight line extending in another direction perpendicular to one direction on a first virtual plane perpendicular to the front-rear axis L1; and step s6 Thus, the first and second cutting steps are appropriately performed according to the situation on the site and the situation of the existing structure 3 to cut the existing structure 3.

  Next, in the moving process, the cutting blade member 5 is moved backward, moved from the position where the existing structure 3 was cut in the cutting process to the next cutting position, and all the existing structures 3 are cut and crushed in step s7. The crushed crushed matter M shown in FIG. 29 is carried out to the ground in the carrying-out process.

  FIG. 31 is a plan view of a cutting device 1a used in the method for removing an existing structure according to another embodiment of the present invention as viewed from above, and FIG. 32 is a contraction of each arm support 9a, 9b of the cutting device 1a. FIG. 33 is a side view of the cutting device 1a as viewed from below in FIG. 31, and FIG. 34 is a perspective view of the cutting device 1a. Note that portions corresponding to those of the above-described embodiment are denoted by the same reference numerals, and description thereof is omitted to avoid duplication.

  In addition to the configuration of the cutting device 1 described above, the cutting device 1a according to the present embodiment is provided on the base 2 and is parallel to the extending direction B1 and the retracting direction B2 on the first virtual plane perpendicular to the longitudinal axis L1. A linear beam light irradiator 170 that is a means for irradiating linear visible light toward the front of the cutting edge portion 4 of the cutting blade member 5 and a second beam light irradiator 170 provided on the base 2 and perpendicular to the longitudinal axis L1. A vertical beam light irradiator that is a vertical beam light irradiation unit that irradiates linear visible light perpendicular to the extending direction B1 and the drawing direction B2 toward the front of the cutting edge portion 4 of the cutting blade member 5 on one virtual plane. 171 and a pair of guide rollers 172a and 172b provided on the reaction force receiving support 11 are further included.

  Each guide roller 172a, 172b is on a first virtual plane perpendicular to the front-rear axis L1, and a virtual cylindrical surface in which a part of the reaction force receiving surface 10 is inscribed with the axis perpendicular to the extending direction B1 and the retracting direction B2 as the center. It projects partially outward from 173 and is provided so as to be rotatable around a rotation axis perpendicular to the extending direction B1 and the retracting direction B2.

  FIG. 35 is a front view showing the operation control device 140a of the hydraulic oil supply device 113 used in the cutting device 1a of the present embodiment. In addition, the part corresponding to the above-mentioned embodiment attaches | subjects the same referential mark, and the overlapping description is abbreviate | omitted. The operation control device 140a according to the present embodiment includes a handle 141, a cover body 142, and a control device main body 143a to which the cover body 142 is attached in the same manner as the operation control device 140 according to the above-described embodiment.

  Similar to the control device main body 143, the control device main body 143a is provided with a connector 146 to which the plug 145 of the cable 144 is detachably connected, and the front panel has a power switch 148, a power lamp 149, and a start switch. 150, a stop switch 151 and an operation changeover switch 152 are similarly provided. In addition to the above-described configuration, the control device main body 143a further includes a light beam irradiation switch 174 for turning on the horizontal beam light irradiation device 170 and the vertical beam light irradiation device 171 and a cutting blade assembly 6 on the front and rear axis L1. A vertical / horizontal switching switch 175 is provided that rotates about a parallel axis to rotate the cutting blade member 5 in the vertical direction or the horizontal direction.

  Referring to FIG. 34 again, the base 2 is provided with a camera 176 for imaging an area where the cutting edge portion 4 of the cutting blade member 5 of the existing structure 3 faces. The camera 176 is realized by a CCD (Charge Cupped Device) camera, for example.

  FIG. 36 is a perspective view showing the display device 177. A display device 177 is provided in the operator room of the crane vehicle on the ground while holding the cutting device 1 in a state suspended in the existing structure 3. On the display screen of such a display device 177, a captured image captured by the camera 176 is displayed. The operator recognizes this captured image by the operator of the crane vehicle and the cutting edge 4 of the cutting device 1a. An image of the inner surface 3a of the existing structure 3 projected in the area where the light beam faces, the lifting bracket 178 provided in the existing structure 3, and the inner surface 3a of the existing structure 3 of the fan beam light of the horizontal beam light irradiator 170 Based on 171a, it is possible to determine the uncut position while confirming the cut site 179 and the like, and to accurately move the cutting device 1a to that position.

  According to the present embodiment, the cutting devices 1 and 1a are carried into the existing structure 3 in the carry-in process, and the cutting blade member 5 of the cutting devices 1 and 1a is advanced in the cutting process so that the existing structure 3 is moved in the longitudinal axis. Cutting in directions B1 and B2 perpendicular to A1 and A2 and front and rear axes A1 and A2, and further moving the cutting devices 1 and 1a to an uncut position, and then repeating the cutting operation again to crush the existing structure 3 Can do. The crushed material M thus crushed can be carried out to the ground 162, and the existing structure 3 can be quickly and easily crushed and removed easily and safely.

  Further, according to the present embodiment, in the cutting step, in the first step, the existing structure 3 is cut along a straight line extending in one direction on a virtual plane perpendicular to the longitudinal axes A1 and A2, and on the virtual plane. Since cutting is performed along a linear direction extending in the other direction perpendicular to one direction, the reinforcing bar in the existing structure 3 can be reliably broken and cut.

  Further, according to the present embodiment, the earth retaining casing 161 is press-fitted from the ground 162 into the ground so as to surround the existing structure 3 before the cutting devices 1 and 1a are carried into the existing structure 3. After the existing structure 3 is cut and the crushed material M is removed, the surrounding earth and sand are prevented from collapsing, and even when the consolidation of the earth and sand around the existing structure 3 is low, The cutting device 1, 1a can be supported by receiving a reaction force at the time of cutting by the cutting device 1, 1a.

  According to the present embodiment, the cutting device 1a is positioned with respect to the existing structure 3 in the directions of the axes B1 and B2 perpendicular to the front and rear axes A1 and A2, in addition to the front and rear axes A1 and A2. 5 is prevented from being inadvertently shifted, and the desired cutting position can be accurately cut.

  Moreover, according to this embodiment, since the image ahead of the blade edge | tip part 4 imaged with the camera 176 is displayed on the display apparatus 177, and based on the displayed image, the cutting device 1a can be moved, existing structure Even when the inside of the object 3 is dark, an operator of the cutting device 1a can easily and accurately recognize the cutting position.

  Further, according to the present embodiment, the fan beam light is applied to the inner surface 3a of the existing structure 3, and the cutting device 1 is moved to the uncut position based on the light image, so that the cut position is recognized more accurately. be able to.

The following embodiments are possible for the present invention.
(1) A cutting device that is provided in a hollow existing structure made of reinforced concrete and cuts the existing structure,
The base,
A cutting blade assembly provided with a cutting blade member having a cutting edge portion capable of cutting an existing structure, and provided movably on a base;
A cutting edge driving means fixed to the base, and advancing the cutting blade assembly in a direction in which the cutting edge portion is close to the inner surface of the existing structure and retreating in a direction in which the cutting edge portion is separated from the inner surface of the existing structure;
Moves to the base in an overhanging direction perpendicular to the longitudinal axis parallel to the direction in which the cutting blade moves forward and backward and away from the base to the side, and in a retracting direction perpendicular to the longitudinal axis and close to the base A pair of arm supports having a support surface that is capable of being brought into contact with the inner surface of an existing structure;
A reaction force receiving support having a reaction force receiving surface provided on the base so as to protrude from the base and capable of contacting the inner surface of the existing structure;
A cutting apparatus comprising: an arm drive means for moving at least one of each arm support in the extending direction and the retracting direction.

  When the cutting device is carried into a hollow existing structure made of reinforced concrete and the cutting blade assembly is advanced from the retracted position by the cutting blade driving means, the cutting edge of the cutting blade member comes into contact with the inner surface of the existing structure. The reaction force receiving support comes into contact with the inner surface of the existing structure, and is supported by the existing structure in the direction in which the cutting device moves forward and backward.

  The base is provided with a pair of arm support members that can move in the extending direction and the retracting direction perpendicular to the longitudinal axis. Each arm support has a side support surface that can come into contact with the inner surface of the existing structure, and each arm support is moved in the overhanging direction by the arm drive means, and the side support of each arm support The surface comes into contact with the inner surface of the existing structure, and the cutting device is also supported in the direction perpendicular to the longitudinal axis with respect to the existing structure.

  In this way, when the cutting device is supported by the cutting blade driving means while being supported in the front-rear direction and the direction perpendicular to the front-rear direction with respect to the existing structure, the existing structure is cut by the cutting edge portion of the cutting blade member. Is done. At this time, if there is no arm support, the existing structure is deformed to extend in the forward direction to become an elliptical shape. Such deformation can be prevented by the arm support body projecting, and the existing structure can be kept circular.

  After cutting the existing structure with the cutting blade member in this way, the cutting blade assembly is retracted by the cutting blade driving means, the cutting blade member is extracted from the existing structure, and each arm support is retracted by the arm driving means. Move in the direction. As a result, the cutting device is released from the state where the existing structure is supported in the front-rear axis and in the direction perpendicular to the front-rear axis, moves the cutting device to the next uncut position, and advances the cutting blade member again. It is possible to remove the existing structure easily and safely by retreating and cutting the existing structure into a desired size that can be removed, shortening the work period and reducing labor compared to the conventional technology. .

(2) The cutting blade assembly includes a rotation attachment portion that is rotatably held around the longitudinal axis by the cutting blade driving means,
A cutting device, wherein a cutting blade member is detachably attached to the rotation attachment portion.
Since the rotation mounting portion has a pair of operation levers, the angle of the cutting blade member can be easily changed by using each operation lever, and the operation of changing the cutting direction of the existing structure by the cutting blade member is facilitated. be able to.

(3) The cutting device characterized in that the rotation mounting portion has a pair of operation levers extending perpendicularly to a virtual plane including the front-rear axis.

  Since the cutting blade assembly has a rotation mounting portion that is rotatably held around the front and rear axis with respect to the cutting blade driving means, the angle around the front and rear axis of the cutting blade member can be freely changed to obtain a desired angle. The existing structure can be cut with. As a result, the reinforced concrete constituting the existing structure, in particular, the reinforcing bars embedded in a lattice in the concrete can be reliably cut. Moreover, since the rotation attachment part is configured so that the cutting blade member can be detachably attached, when the cutting edge member is damaged or worn, it can be easily replaced with a new cutting blade member. Can do.

(4) An auxiliary cutting blade assembly having an auxiliary cutting edge member having an auxiliary cutting edge capable of cutting the existing structure, and provided on the base so as to be movable along the longitudinal axis adjacent to the cutting blade assembly. When,
Auxiliary cutting blade fixed to the base and advancing the auxiliary cutting edge assembly in a direction in which the auxiliary cutting edge is close to the inner surface of the existing structure, and retreating in a direction in which the auxiliary cutting edge is separated from the inner surface of the existing structure And a driving device.

  Since the auxiliary cutting blade assembly having the auxiliary cutting blade member on the base is provided adjacent to the aforementioned cutting blade assembly, the portion adjacent to the cutting position by the cutting blade member of the cutting blade assembly is set to the auxiliary cutting blade assembly. Cutting can be performed by a three-dimensional auxiliary cutting blade member, and thereby the cutting range and cutting position can be expanded and the efficiency of the cutting operation can be improved as compared with a cutting operation using only the cutting blade member.

(5) A transverse beam light irradiation means provided on the base,
It further includes lateral beam light irradiation means for irradiating linear visible light parallel to the extending direction and the drawing direction on the virtual plane perpendicular to the longitudinal axis toward the front of the cutting edge portion of the cutting blade member. Cutting device to do.

  Since the base is provided with means for irradiating the transverse beam light, the cutting device is inserted into the existing structure, and the inner surface of the existing structure is parallel to the axis including the extending direction and the retracting direction of each arm support. The operator recognizes the relative positional relationship of the uncut position to be cut next with respect to the cutting position by the cutting blade member or the cutting position by the auxiliary cutting blade member easily and accurately. This can improve the efficiency of the cutting operation.

(6) Vertical beam light irradiation means provided on the base,
It further comprises a vertical beam light irradiation means for irradiating linear visible light perpendicular to the extending direction and the drawing direction toward the front of the cutting edge portion of the cutting blade member on a virtual plane perpendicular to the longitudinal axis. Cutting device to do.

  Since the base is provided with the vertical beam light irradiation means, visible light can be irradiated on the inner surface of the existing structure in parallel with the axis perpendicular to the axis including the extending direction and the retracting direction of each arm support. With such visible light, the relative positional relationship between the cutting position by the cutting blade member or the cutting position by the auxiliary cutting blade member and the next scheduled cutting position can be easily and accurately recognized, and the cutting device The accuracy and efficiency of the existing structure can be improved.

(7) A guide roller provided on the reaction force receiving support,
On the virtual plane perpendicular to the front-rear axis, centering on the axis perpendicular to the overhang direction and the pull-in direction, a part of the reaction force receiving surface partially protrudes outward from the inscribed virtual cylindrical surface, and the overhang direction and the pull-in A cutting device further comprising a pair of guide rollers provided rotatably around a rotation axis perpendicular to the direction.

  Since the reaction force receiving support is provided with a pair of guide rollers, when the cutting blade member is advanced and each guide roller comes into contact with the inner surface of the existing structure, the cutting device is placed on a virtual plane including each rotation axis of each guide roller. On the other hand, the front and rear axes are positioned on a virtual plane perpendicular to the vertical plane, and the direction of the cutting blade member or the auxiliary cutting blade member can be stabilized in a certain direction.

(8) The arm drive means is
A single double acting cylinder with a piston rod extending and retracting;
A cutting apparatus comprising: one input end connecting portion connected to the piston rod; and link means having two output end connecting portions connected to each of the arm support members.

  Since the arm drive means is configured to include a single double-action cylinder and link means, each arm support can be operated simultaneously by a single double-action cylinder, thereby miniaturizing the configuration, It becomes possible to carry out a cutting operation by carrying the cutting device into a narrow space in the existing structure.

(9) When the piston rod of the double-acting cylinder is extended to the maximum length, the link means connects each of the two output end connecting portions and the base with the longitudinal axis, the overhanging direction, and the retracting direction. A cutting device comprising a plurality of link members connected in a straight line on a virtual plane including an axis.

  The above-mentioned link means has a plurality of link members, and these link members are connected to each of the two output end connecting portions and the base with the piston rod of the double-acting cylinder extended to the maximum length. It is connected in a straight line on an imaginary plane including the axis and the axis including the extending direction and the retracting direction, and the force that each arm support receives as a reaction force from the existing structure can be received as a compression force. The cross-section perpendicular to the longitudinal direction of each link member can be made smaller than when a large bending moment acts, and the effect that the structure of the link means is not increased can be achieved.

  As described above, the embodiment of the present invention cuts the existing structure by moving the cutting blade member and / or the auxiliary cutting blade member forward and backward by the driving means such as a double-acting hydraulic cylinder. For example, for an existing structure with a manhole depth of 5 m, it is possible to perform construction for a short period of about 2 days from the insertion of the casing to the excavation removal. You can work safely by remote control. Moreover, since the cutting blade member can be rotated around the longitudinal axis, the existing structure can be freely cut, and the degree of freedom in use is high and the operability is good. When there is no existing casing, the casing is press-fitted in the first step, so that the surrounding natural ground is not disturbed. Further, when there is no existing casing, the existing pipeline can be cut with a clean cross section by press-fitting the earth retaining casing in the first step.

DESCRIPTION OF SYMBOLS 1 Cutting device 2 Base 3 Existing structure 4 Cutting edge part 5 Cutting blade member 6 Cutting blade assembly 7a, 7b, 12, 16 Double acting cylinder 8, 94, 95 Support surface 9a, 9b Arm part support body 10 Reaction force receiving Surface 11 Reaction force receiving support 13 Auxiliary cutting blade member 14 Auxiliary cutting blade assembly 40 Rotating mounting portion 60 Arm drive means 61 Link means 113 Hydraulic oil supply device 140, 140a Operation control device 143, 143a Control device main body 170 Horizontal beam light irradiator 171 Vertical beam light irradiator 172a, 172b Guide roller 173 Virtual cylindrical surface 176 Camera 177 Display device

Claims (5)

A hollow existing structure made of reinforced concrete, embedded in the ground, has a cutting edge, the cutting edge advances in a direction close to the inner surface of the existing structure, and the cutting edge extends from the inner surface of the existing structure. A carrying-in process for carrying in a cutting device comprising a cutting blade member that retreats in the direction of separating;
An axial direction perpendicular to the front-rear axis on a virtual plane including the front-rear axis and the front-rear axis parallel to the advancing and retreating direction by advancing the cutting blade member of the cutting device carried into the existing structure in the carrying-in process In addition, a cutting step of supporting the cutting device with the existing structure and cutting the existing structure with the cutting blade member;
A moving step in which the cutting device is moved back from the position where the existing structure is cut in the cutting step by moving the cutting blade member backward;
A crushing step of crushing an existing structure by repeating the cutting operation in the cutting step and the moving operation in the moving step,
The crushed existing structures that have been crushed by the crushing step, seen including a unloading step for unloading the ground,
The cutting step includes
A first cutting step of cutting an existing structure by a cutting blade member along a straight line extending in one direction on a virtual plane perpendicular to the longitudinal axis;
A second cutting step of cutting the existing structure with a cutting edge member along a straight line extending in the other direction perpendicular to one direction on a virtual plane perpendicular to the longitudinal axis . Removal method. The method for removing an existing structure according to claim 1 , further comprising a press-fitting step of press-fitting a cylindrical earth retaining casing from the ground so as to surround the existing structure before the carrying-in step. . In the cutting step, the cutting device is supported by the existing structure in a state where the front-rear axis and the axis perpendicular to the front-rear axis are positioned so as to be orthogonal to the central axis of the existing structure. The removal method of the existing structure of Claim 1 or 2 . A camera that captures an area where the cutting edge of the cutting member of an existing structure faces;
A display device installed at a predetermined installation position on the ground and displaying an image captured by a camera is prepared,
The method for removing an existing structure according to any one of claims 1 to 3 , wherein the cutting device is moved to an uncut position in the moving step based on an image displayed on a display device. . The cutting device includes an irradiation device that irradiates fan beam light toward a region where a blade edge portion of the cutting blade member faces on an inner surface of an existing structure,
In the moving step, on the basis of the existing structure optical image irradiated to the inner surface of the fan beam, any one of claims 1-4, characterized in that to move the cutting device in the non-cutting position The removal method of the existing structure as described in.

Images