JP4525228B2 - Excavator, wall pile construction method, and wall pile - Google Patents

Description

  The present invention relates to a drilling device, a wall pile construction method, and a wall pile, and more particularly, to a drilling device, a wall pile construction method, and a wall pile that can easily construct a wall pile having a continuous widened portion.

Conventionally, a round pile having a widened portion has been used to cope with a pushing force of a building and a pulling force such as an earthquake. As shown in Patent Document 1, for example, a round pile having a widened portion extends vertically downward from the tip of the boom, and can be opened and closed in the radial direction at the tip of the kelly bar. In a state where the bucket is opened after inserting the closed bucket into the excavation hole formed in the ground in advance using a rotary excavator provided with a bucket that rotates with the rotation of the kelly bar. It is constructed by rotating the kelly bar. Patent Document 2 discloses a technique for constructing a wall pile having a continuous widened portion in order to improve the resistance in the horizontal direction.
Japanese Patent Publication No. 6-13827 JP 2003-213675 A

  By the way, a wall pile as shown to patent document 2 can be constructed as follows, for example. First, a substantially elliptical excavation hole for a continuous wall is formed by a horizontal multi-axis excavator or the like. Next, using a rotary excavator as shown in Patent Document 1, a bucket is inserted into the substantially elliptical excavation hole to form a widened portion, and then the bucket is lifted and then moved horizontally, The bucket is lowered at the moved position to form the widened portion as described above. Such operations are repeated to construct a wall pile excavation hole having a continuous widening space. Finally, concrete is placed in the wall pile excavation hole to construct a wall pile having a continuous widened portion. However, in such a method, it is necessary to repeat the operations of lifting the bucket, moving it horizontally, positioning, and lowering the bucket to form the widened portion. It is very complicated.

  An object of the present invention is to provide a drilling apparatus, a wall pile construction method, and a wall pile that can easily construct a wall pile having a continuous widened portion.

  The present invention includes a kerry bar that rotates about a vertical direction as an axis, and a rectangular shape that is attached to the tip of the kelly bar, rotates with the rotation of the kelly bar, and can be opened and closed in the radial direction, and is formed on the ground. An excavation apparatus for forming a wall pile having a widened portion continuous in a horizontal direction by inserting the bucket into a hollow excavation hole, and is installed inside the excavation hole and pivotally supports the kelly bar A stabilizer for pressing the inner wall surface of the excavation hole to fix the position of the kelly bar, a moving device capable of horizontally moving the kelly bar along the longitudinal direction of the excavation hole, and the moving device. And a kelly bar attitude control device for maintaining a vertical attitude of the kelly bar when the kelly bar moves horizontally.

  According to the present invention, the closed bucket is inserted into the excavation hole, the inner wall surface of the excavation hole is pressed to fix the position of the stabilizer, and then the kelly bar is rotated while the bucket is opened to In this state, the kelly bar attitude control device maintains the vertical position of the kelly bar while the kerry bar is horizontally moved by the moving device, and the wall pile excavation hole has a widening space continuous in the horizontal direction. Form. Then, concrete is placed in the wall pile excavation hole to construct a wall pile having a widened portion continuous in the horizontal direction. For this reason, unlike the prior art, it is not necessary to move the bucket up and down and move it horizontally, or to position it. Therefore, it is possible to easily construct a wall pile having a widened portion continuous in the horizontal direction.

  Here, the moving device is provided in the excavation hole, and includes a cylinder and a rod that can move forward and backward horizontally along the longitudinal direction of the excavation hole with respect to the cylinder, and the stabilizer includes the cylinder or Attaching to the rod and supporting member supporting the kelly bar, attaching to the tip of the cylinder and the rod, and advancing and retreating in a direction perpendicular to the advancing and retreating direction of the rod, the inner wall surface of the excavation hole The structure provided with the pressing member which can be pressed is employable.

  Further, the moving device is a crawler provided in the excavation hole and capable of horizontally traveling along the longitudinal direction of the excavation hole, and the stabilizer is attached to the crawler and supports the kelly bar. It is good also as a structure provided with a supporting member and the pressing member which is provided in the said crawler, advances and retracts in the direction orthogonal to the moving direction of the said crawler, and can press the inner wall face of the said excavation hole.

  In such excavation apparatus, a fixed frame installed in the excavation hole may be provided, and the pressing member may be configured to be able to press the inner wall surface of the excavation hole via the fixed frame.

  The moving device includes a gantry attached to a ground surface around the excavation hole, and a base that can move horizontally along the longitudinal direction of the excavation hole with respect to the gantry, and the stabilizer includes: It is good also as a structure provided with the reaction member inserted in the said excavation hole, and the support member which supports the said Kelly bar and presses the said reaction member while being attached to the said base.

  The present invention is a kelly bar that rotates about the vertical direction as an axis, and is attached to the tip of the kelly bar, rotates with the rotation of the kelly bar, and supports the kelly bar that can be opened and closed in the radial direction, and the kerry bar. A stabilizer installed in a rectangular excavation hole formed in the ground and pressing the inner wall surface of the excavation hole to fix the position of the kelly bar, while maintaining the vertical posture of the kelly bar, A wall pile construction method for constructing a wall pile having a widened portion continuous in a horizontal direction using a excavator provided with a moving device capable of moving horizontally along the longitudinal direction of the excavation hole, Inserting the closed bucket, pressing the inner wall surface of the excavation hole to fix the position of the stabilizer, and opening the bucket The kerry bar is horizontally moved by the moving device while performing the step of forming the widening space on the inner wall surface of the excavation hole and the step of forming the widening space by rotating the kelly bar in the state, Forming a wall pile excavation hole having a continuous widening space in the direction, and placing a concrete into the wall pile excavation hole having a continuous widening space, thereby providing a wall pile having a continuous widening portion. And a forming step. Moreover, this invention is the wall pile constructed | assembled by the said wall pile construction method.

  According to the excavator, the wall pile construction method, and the wall pile of the present invention, there is an effect that a wall pile having a continuous widened portion can be easily constructed.

[First Embodiment]
Hereinafter, excavation equipment concerning a 1st embodiment of the present invention is explained based on a drawing.
FIG. 1 is a side view schematically showing the excavator 1 according to the present embodiment. As shown in FIG. 1, the excavator 1 includes a traveling body 12 that can travel on the ground, a boom 14 that extends upward and downward from the traveling body 12, and a vertically downward extending from the tip of the boom 14. The kelly bar 16 is rotatable about the vertical direction, and the bucket 20 is attached to the lower end of the kelly bar 16. The kelly bar 16 may be configured to continuously rotate in one direction or both directions, or may be configured to be normally and reversely rotated by a predetermined angle range.

  FIG. 2 is a front view showing the bucket unit 20. FIG. 3 is a cross-sectional view showing the bucket portion 20. As shown in FIGS. 2 and 3, the bucket portion 20 includes a hydraulic cylinder 22 attached to the tip of the kelly bar 16 (FIG. 1), a rod 24 that moves forward and backward with respect to the hydraulic cylinder 22, A housing case 26 for housing the rod 24 is provided. The bucket portion 20 is configured to protrude from the opening 26A of the housing case 26, and is configured to be openable and closable with respect to the housing case 26, for example, two arm portions 28 attached to the tip of the rod 24. For example, two buckets 30 to which the tip of the portion 28 is attached are provided. In addition, the arm part 28 can be arrange | positioned in the position symmetrical with respect to the rod 24 as an axis | shaft, for example, In this case, the bucket 30 is also arrange | positioned in the position symmetrical with respect to the storage case 26.

  Each bucket 30 is formed, for example, in a trapezoidal shape with angles θ1 and θ2 of approximately 45 °. Irregularities for efficiently excavating the ground G are formed on each side of the trapezoid. In addition, in the bucket 30 on the right side in the figure and the bucket 30 on the left side in the figure, the formation positions of the irregularities are shifted so that the irregularities are opposite to each other. There is no beautiful trapezoidal widened part. Note that the shape of the bucket 30 is not limited to a trapezoidal shape, and may be other shapes such as a triangular shape, and may be appropriately changed according to a desired shape of the widened portion. Further, the number of buckets 30 is not limited to two.

  In such a bucket portion 20, when the rod 24 is moved downward in FIG. 2 from the hydraulic cylinder 22, the arm portion 28 attached to the tip of the rod 24 protrudes from the opening 26 </ b> A of the housing case 26, and the solid line in FIG. 3. As shown, the bucket 30 attached to the tip of the arm portion 28 opens in the radial direction of the housing case 26. On the other hand, when the rod 24 is moved to the hydraulic cylinder 22 side (upward in FIG. 2), the arm portion 28 attached to the tip of the rod 24 is housed in the housing case 26, as shown by the broken line in FIG. The bucket 30 attached to the tip of the arm portion 28 is closed to the housing case 26 side. The bucket portion 20 rotates with the rotation of the kelly bar 16, and at this time, by opening the bucket 30 as described above, the ground is excavated with the opened bucket 30 to form a widening space for the widening portion. Can do.

  When the kelly bar 16 rotates forward and reverse only within a predetermined angle range, for example, by opening only one of the buckets 30 and rotating the kelly bar 16 forward and reverse, the bucket 30 also rotates forward within the predetermined angle range. For example, the widened portion can be formed only on one side of the thin wall pile.

  Returning to FIG. 1, the excavator 1 is provided between the kelly bar 16 and the bucket unit 20, and the stabilizer moving unit 40 that moves the kelly bar 16 in the horizontal direction, and when the kelly bar 16 moves horizontally, And a Kelly bar attitude control device 42 for controlling the attitude in the vertical direction. The kelly bar attitude control device 42 controls the vertical attitude of the kelly bar 16 by adjusting the position of the traveling body 12 and the attitude of the boom 14 based on the inclinometer 44 that measures the inclination of the kelly bar 16 and the measurement result of the inclinometer 44. And a control device 45.

  FIG. 4 is a longitudinal sectional view of the stabilizer moving unit 40 as viewed from the side. FIG. 5 is a longitudinal sectional view of the stabilizer moving unit 40 as viewed from the front. FIG. 6 is a cross-sectional view of the stabilizer moving unit 40. As shown in FIG. 6, the stabilizer moving part 40 is provided in a rectangular excavation hole A formed in the ground G and extending in the left-right direction in the figure. The stabilizer moving unit 40 includes a fixed frame 46 (FIG. 6) installed in the excavation hole A, a plurality of hydraulic jacks 48 as moving devices provided in the fixed frame 46, and a stabilizer 50 provided in the fixed frame 46. And.

Each hydraulic jack 48 includes a cylinder 52 and a rod 54 that can advance and retreat horizontally along the longitudinal direction of the excavation hole A (left and right direction in FIG. 6) with respect to the cylinder 52.
The stabilizer 50 is attached between the cylinders 52 adjacent to each other in the horizontal direction, and is attached to the support member 56 that pivotally supports the kelly bar 16, the proximal end member 58 attached to the proximal end 52A of the cylinder 52, and the distal end 54A of the rod 54. And a distal end side member 60 to be attached.

  The base end side member 58 is fixed to the base end 52A of the cylinder 52, and a direction (vertical direction in FIG. 6) attached to the frame 62 and perpendicular to the forward / backward direction of the rod 54. And a hydraulic jack 64 that moves forward and backward. Similarly, the distal end side member 60 has a frame 63 fixed to the distal end 54A of the rod 54 and a direction (vertical direction in FIG. 6) perpendicular to the advancing / retreating direction of the rod 54 attached in the frame 63. And a hydraulic jack 65 that advances and retreats. The hydraulic jacks 64 and 65 are respectively attached to the cylinders 64A and 65A, the rods 64B and 65B that can advance and retreat with respect to the cylinders 64A and 65A, the base ends of the cylinders 64A and 65A, and the distal ends of the rods 64B and 65B, respectively. Contact members 64C and 65C that contact the fixed frame 46 are provided. The hydraulic jacks 64 and 65 correspond to the pressing member of the present invention.

  According to such hydraulic jacks 64 and 65, the rods 64B and 65B are projected from the cylinders 64A and 65A, and the inner wall surface of the excavation hole A is strongly pressed by the contact members 64C and 65C through the fixed frame 46. Thus, the proximal end member 58 and the distal end side member 60 can be fixed in the excavation hole A. Therefore, the stabilizer moving portion 40 can be held at an arbitrary height position of the excavation hole A by projecting the rods 64B, 65B of the hydraulic jacks 64, 65 of both the base end side member 58 and the distal end side member 60.

  Further, the rod 64B of the hydraulic jack 64 is protruded and the fixing frame 46 is strongly pressed by the contact member 64C of the distal end side member 60, while the rod 65B of the hydraulic jack 65 is moved backward to contact the contact member of the proximal end side member 58. When the hydraulic jack 48 is driven to extend in a state where the pressing force by 64C is weakened, the kelly bar 16 attached to the cylinder 52 is moved leftward in FIG. 6 from the position indicated by the two-dot chain line in FIGS. Finally, the kelly bar 16 can move to the position indicated by the solid line in FIGS.

  A procedure for constructing a wall pile having a continuous widened portion using the excavator 1 will be described. FIG. 7 is a schematic diagram for explaining a procedure for constructing a wall pile having a continuous widened portion. As shown in FIG. 7A, a rectangular excavation hole A is formed in the ground G using, for example, a horizontal multi-axis excavator or the like. Next, a fixed frame 46 is attached in the excavation hole A, and the bucket portion 20 having the closed bucket 30 together with the kelly bar 16 is inserted into the excavation hole A, as shown in FIG. Insert inside.

  Next, the rods 64B and 65B are protruded from the cylinders 64A and 65A, respectively, and the fixed frame 46 in the excavation hole A is pressed by the contact members 64C of the proximal end side member 58 and the distal end side member 60, and the stabilizer moving unit 40 Is fixed at a predetermined height position of the excavation hole A. In this case, the pressing force by the contact member 64 </ b> C of the base end side member 58 is made relatively small so that the contact member 64 </ b> C can move along the surface of the fixed frame 46.

  Next, the kelly bar 16 is rotated with the bucket 30 opened, and the bucket 30 is rotated by the rotation of the kelly bar 16, so that the widening space is formed on the inner wall surface of the excavation hole A as shown in FIG. 102A is formed. Next, when the rod 54 of the hydraulic jack 48 is moved into the cylinder 52 while forming the widening space 102A in this way, the contact member 64C of the base end side member 58 slides on the surface of the fixed frame 46, and the cylinder 52 moves horizontally. As a result, the support member 56 of the stabilizer 50 attached to the cylinder 52 also moves horizontally, and the Kelly bar 16 pivotally supported by the support member 56 also moves horizontally as shown by the arrow X as shown in FIG. . When the kelly bar 16 moves horizontally, the inclination of the kelly bar 16 is measured by the inclinometer 44, and the control device 45 adjusts the position of the traveling body 12 and the posture of the boom 14 based on the result, thereby The posture can be controlled so as to always extend in the vertical direction. In this way, a wall pile excavation hole 102 having a continuous widened space 102A as shown in FIG. 7D is formed.

  Next, the kelly bar 16 and the bucket portion 20 are taken out from the wall pile excavation hole 102 in which the wide space 102A is formed as described above. Then, after stabilizing the wall surface of the wall pile excavation hole 102, a reinforcing bar rod (not shown) is inserted into the wall pile excavation hole 102, and concrete is placed. Thereby, as shown in FIG. 8, the wall pile 100 in which the continuous wide part 100A was formed in the both sides | surfaces can be formed. In addition, although the bottom part of the wall pile 100 of FIG. 8 is formed with a bottom section 101B having a triangular cross section, the bottom section 100B changes the shape of the bucket 30 of the excavator 1 from a trapezoidal shape to a triangular shape. The triangular bucket can be installed at the bottom of the wall pile 100 and can be constructed in the same procedure as the widened space 102A.

  Further, for example, as shown in FIG. 9, it is possible to form the wall pile 101 in which the widened portion 101 </ b> A continuous only on one side surface is formed using the excavator 1. Such a wall pile 101 can rotate the kelly bar 16 only within a predetermined angle range, or can decenter the position of the kelly bar 16 serving as the rotation center toward the side where the widened portion 101A is formed. Construction can be performed by rotating the kelly bar 16 at the position. In addition, similarly to the wall pile 100, the wall pile 101 of FIG. 9 has a bottom expanded portion 101B having a triangular cross section at the bottom. In this case, the wall pile 101 may be constructed similarly to the widened portion 100A.

  According to the excavating apparatus 1 described above, unlike the conventional case, there is no need to move the bucket 30 up and down to move it horizontally or to position it. Therefore, the wall pile 100 having the widened portion 100A continuous in the horizontal direction can be simplified. Can be installed. Further, since the fixed frame 46 is provided in the excavation hole A, the stabilizer moving part 40 can be reliably fixed at a predetermined height position without being affected by the hardness or state of the wall surface of the excavation hole A.

[Second Embodiment]
Next, the excavator 2 according to the second embodiment of the present invention will be described. The excavator 2 of the present embodiment is different from the excavator 1 of the first embodiment in the configuration of the stabilizer moving unit, and hereinafter, this difference will be mainly described. In addition, the same code | symbol is attached | subjected to the component similar to or equivalent to 1st Embodiment, and the description is abbreviate | omitted or simplified.

  FIG. 10 is a longitudinal sectional view of the stabilizer moving unit 70 according to the second embodiment as viewed from the side. FIG. 11 is a longitudinal sectional view of the stabilizer moving unit 70 as viewed from the front. FIG. 12 is a cross-sectional view of the stabilizer moving unit 70. As shown in FIGS. 10 to 12, the stabilizer moving unit 70 includes a crawler 72 as a moving device provided in the rectangular excavation hole A, a case 74 that houses the crawler 72, and a stabilizer 80. .

  As shown in FIG. 12, the crawler 72 includes a plurality of wheels 76 and a belt 78 attached around these wheels 76, and the belt 78 is rotated by the rotation of the wheels 76. The crawler 72 moves horizontally in the case 74 by meshing with the inner surface.

  The stabilizer 80 is attached between the wheels 76, and includes a support member 82 that can move horizontally with the crawler 72, and a plurality of pressing members 84 that are attached to protrude toward the inner wall surface side of the excavation hole A from the case 74. I have. The support member 82 is a member that pivotally supports the kelly bar 16. Each pressing member 84 includes a contact portion 86 that contacts the inner wall surface of the excavation hole A and a rod 88 that advances and retracts the contact portion 86, and the contact portion 86 is a direction orthogonal to the moving direction of the crawler 72 ( It can advance and retreat in the vertical direction in FIG. 12 and press the inner wall surface of the excavation hole A.

  In the stabilizer moving part 70 of the excavator 2 as described above, the rod 88 of the pressing member 84 is moved to the inner wall surface side and the inner wall surface is pressed by the contact part 86 to fix the case 74 at a predetermined position in the excavation hole A. In this state, by rotating the wheel 76, the belt 78 and the inner surface of the case 74 mesh with each other, and the crawler 72 moves horizontally in the case 74. At this time, since the support member 82 that pivotally supports the kelly bar 16 is attached to the crawler 72, the kelly bar 16 can be moved horizontally while rotating the bucket 30 by rotating the kelly bar 16.

  According to such excavation apparatus 2, the wall pile 100 which has the widened part 100A continuous in the horizontal direction can be easily constructed by performing the procedure similar to 1st Embodiment. In addition, since the crawler 72 moves in the case 74, the stabilizer moving unit 70 is not affected by the hardness or state of the inner wall surface as compared with the case where the inner wall surface of the excavation hole A is moved. It can be securely fixed at a predetermined height position.

[Third Embodiment]
Next, the excavator 3 according to the third embodiment of the present invention will be described. The excavator 3 of the present embodiment is different from the excavator 2 of the second embodiment in the configuration of the crawler 72 that constitutes the stabilizer moving unit 70, and this difference will be mainly described. FIG. 13 is a cross-sectional view illustrating a stabilizer moving unit 90 according to the third embodiment. As shown in FIG. 13, the stabilizer moving unit 90 includes a moving device 92 provided in the excavation hole A, a case 74 that accommodates the moving device 92, and a stabilizer 80.

  The moving device 92 includes a base 94 to which a support member 82 that pivotally supports the Kelly bar 16 is attached, a drive motor 96 attached to the base 94, a wheel train 98 interlocked with the drive motor 96, and a wheel train 98. A rack 99 is provided that meshes with each other and is attached to the inner surface of the case 74. In the stabilizer moving unit 90, when the train wheel 98 is rotated by the rotation of the drive motor 96, the base 94 moves horizontally along the rack 99 that meshes with the train wheel 98. According to such excavation device 3, the wall pile 100 having the widened portion 100 </ b> A continuous in the horizontal direction can be easily constructed in the same manner as the excavation device 2.

[Fourth Embodiment]
Next, the excavator 4 according to the fourth embodiment of the present invention will be described. The excavator 4 of the present embodiment is different from the excavators 1 to 3 of the above-described embodiments in the configuration of the stabilizer moving unit. Hereinafter, the difference will be mainly described. FIG. 14 is a longitudinal sectional view of the stabilizer moving unit 200 according to the fourth embodiment as viewed from the front. FIG. 15 is a plan view of the stabilizer moving unit 200. As shown in FIGS. 14 and 15, the stabilizer moving unit 200 includes a moving device 210 provided on the surface G1 of the ground G around the rectangular excavation hole A, and a stabilizer 230 provided in the excavation hole A. ing.

  The moving device 210 includes a base 212 made of H-shaped steel or the like attached on the surface G 1 of the ground G, a base 214, and a base along the longitudinal direction of the excavation hole A (left and right direction in FIG. 13) with respect to the base 212. And a moving device body 216 for moving the table 214 horizontally. The moving device main body 216 includes a pinion 218 attached to the lower surface of the base 214, a rack 220 provided on the upper surface of the base 212 and meshing with the pinion 218, and a motor 222 attached to the base 214 and rotating the pinion 218. I have. In such a moving device 210, when the pinion 218 rotates by the rotation of the motor 222, the base 214 moves horizontally along the rack 220 that meshes with the pinion 218.

  The stabilizer 230 is attached to the base 214, and a reaction force member 224 that is vertically inserted into the excavation hole A, a support member 226 that pivotally supports the kelly bar 16, and protrudes from the reaction force member 224 toward the support member 226. And a guide member 228 that is attached to the reaction force member 224 and guides the support member 226. The support member 226 fixes its position by pressing the guide member 228.

  In such excavation apparatus 4, the moving apparatus main body is provided so that the reaction force member 224 provided on the base 214 and attached with the guide member 228 can be inserted into the excavation hole A and moved horizontally with respect to the gantry 212. A base 214 is installed via H.216. In this state, the bucket 30 and the support member 226 are inserted into the excavation hole A together with the kelly bar 16, and the position is fixed by pressing the guide member 228 with the support member 226. After fixing the stabilizer moving part 200 in this way, the base 214 is moved in the horizontal direction by rotating the Kelly bar 16 and forming the widened part by the bucket 30 as in the first embodiment. The wall pile 100 having the continuous widened portion 100A can be easily constructed.

  The present invention is not limited to the above embodiments. For example, in the first embodiment, the support member 56 that pivotally supports the kelly bar 16 is attached to the cylinder 52, but may be attached to the rod 54. In the first embodiment, the fixed frame 46 is provided in the excavation hole A. However, the fixing frame 46 may not be provided. In 1st Embodiment, although the hydraulic jack 64 was employ | adopted as a pressing member for pressing an inner wall surface via the fixed frame 46, it is not limited to this.

  In the second embodiment, the crawler 72 is configured to move in the case 74, but may be configured to move on the inner wall surface of the excavation hole A. In the second and third embodiments, the inner wall surface of the excavation hole A is directly pressed by the pressing member 84. However, a fixed frame as in the first embodiment is provided on the inner wall surface of the excavation hole A. And it is good also as a structure which presses the inner wall face of the excavation hole A through this fixed frame.

  In the fourth embodiment, the moving device 210 is configured to move the base 214 horizontally by engaging the rack 220 and the pinion 218. However, the moving device 210 may be configured to move using a hydraulic jack or a crawler.

  Moreover, in each said embodiment, although the widened part continued in the horizontal direction of the wall pile was formed, for example, by operating the boom 14 etc. which lifts the bucket 30 upwards, etc. A continuous widened portion may be formed.

  In addition, the wall pile to construct is not limited to the shape shown in FIG. 8, FIG. For example, FIG. 16 is a perspective view schematically showing a wall pile 300 formed with a widened portion 301 according to a first modification of the present invention. As shown in FIG. 16, the wall pile 300 has a widened portion 301 formed only on one side. The widened portion 301 has a trapezoidal shape whose longitudinal section is long in the vertical direction, and is continuously formed along the horizontal direction. Such a widened portion 301 can be constructed in the same procedure as in each of the above embodiments using the excavators 1 to 4 to which the trapezoidal bucket 30 that is long in the vertical direction is applied. In FIG. 16, the widened portion 301 is formed only on one side, but may be formed on both sides.

  FIG. 17 is a perspective view schematically showing a wall pile 400 in which a widened portion 401 is formed according to a second modification of the present invention. As shown in FIG. 17, the wall pile 400 has a widened portion 401 formed only on one side. The widened portion 401 is formed in a trapezoidal shape whose longitudinal section is long in the vertical direction, and a plurality of widened portions 401 are formed at intervals along the horizontal direction. Such a widened portion 401 is formed by first forming a widened space for each first width portion 401 using the excavators 1 to 4 to which the trapezoidal bucket 30 that is long in the vertical direction is applied. The kelly bar 16 is moved horizontally with the 30 closed, and the bucket 30 is opened again to form a widened space for each second width portion 401. Thereby, the wall pile 400 in which the wide part 401 was formed at intervals can be constructed. In FIG. 17, the widened portion 401 is formed only on one side, but may be formed on both sides.

  FIG. 18 is a perspective view schematically showing a wall pile 500 formed with a widened portion 501 according to a third modification of the present invention. As shown in FIG. 18, the wall pile 500 has a widened portion 501 formed only on one side. Such a widened portion 501 is formed in a triangular shape in the longitudinal section similar to the widened portion 101B shown in FIG. As described above, such a widened portion 501 can be constructed in the same procedure as in each of the above embodiments using the excavators 1 to 4 to which the triangular bucket 30 is applied. In FIG. 18, the widened portion 501 is formed only on one side, but may be formed on both sides.

FIG. 19 is a perspective view schematically showing a wall pile 600 formed with a widened portion 601 according to a fourth modification of the present invention. As shown in FIG. 19, the wall pile 600 has a widened portion 601 formed only on one side. The widened portion 601 is formed in a triangular shape in vertical section, and a plurality of widened portions 601 are formed at intervals along the horizontal direction. Such a widened portion 601 first formed a widened space for each of the first width portions 601 using the excavators 1 to 4 to which the triangular bucket 30 was applied, and then closed the bucket 30. In this state, the Kelly bar 16 is moved horizontally, and the bucket 30 is opened again to form a widening space for each second width portion 601. Thereby, the wall pile 600 in which the widened part 601 was formed at intervals can be constructed. In FIG. 19, the widened portion 601 is formed only on one side, but may be formed on both sides.
Not only the wall pile of the above shape but an arbitrary shape can be used.

1 is a side view schematically showing an excavator according to a first embodiment of the present invention. It is a front view which shows the bucket part which comprises the said excavation apparatus. It is a cross-sectional view showing the bucket part. It is the longitudinal cross-sectional view which looked at the stabilizer moving part which comprises the said excavation apparatus from the side. It is the longitudinal cross-sectional view which looked at the said stabilizer movement part from the front. It is a cross-sectional view of the stabilizer moving part. It is a schematic diagram for demonstrating the procedure which constructs the wall pile which has a wide part. It is a perspective view which shows typically the wall pile in which the widening part which followed the both sides was formed. It is a perspective view which shows typically the wall pile in which the widening part continuous only on one side was formed. It is the longitudinal cross-sectional view which looked at the stabilizer moving part which comprises the excavation apparatus which concerns on 2nd Embodiment of this invention from the side. It is the longitudinal cross-sectional view which looked at the stabilizer moving part which concerns on the said 2nd Embodiment from the front. It is a cross-sectional view of the stabilizer moving part according to the second embodiment. It is a cross-sectional view which shows the stabilizer moving part which concerns on 3rd Embodiment of this invention. It is the longitudinal cross-sectional view which looked at the stabilizer moving part which concerns on 4th Embodiment of this invention from the front. It is a top view of the stabilizer moving part which concerns on the said 4th Embodiment. It is a perspective view which shows typically the wall pile in which the widening part was formed based on the 1st modification of this invention. It is a perspective view which shows typically the wall pile in which the widening part was formed based on the 2nd modification of this invention. It is a perspective view which shows typically the wall pile in which the widening part was formed based on the 3rd modification of this invention. It is a perspective view which shows typically the wall pile in which the widening part was formed based on the 4th modification of this invention.

Explanation of symbols

1-4 Excavator 16 Kelly bar 30 Bucket 42 Kelly bar attitude control device 46 Fixed frame 48 Hydraulic jack (moving device)
50, 80, 230 Stabilizer 52 Cylinder 54 Rod 64, 65 Hydraulic jack (pressing member)
72 Crawler (moving device)
82 Support member 84 Press member 92,210 Moving device 100, 101 Wall pile 100A, 101A Widening section 102 Wall pile excavation hole 102A Widening space 212 Base 214 Base 224 Reaction force member 226 Support member A Drilling hole G Ground

Claims (7)

A rectangular excavation hole formed in the ground, comprising a kerry bar that rotates about the vertical direction, and a bucket that is attached to the tip of the kelly bar and rotates with the rotation of the kelly bar and that can be opened and closed in the radial direction. A drilling device for inserting a wall into a wall pile having a widened portion continuous in a horizontal direction,
A stabilizer that is installed inside the excavation hole, supports the kelly bar, and presses an inner wall surface of the excavation hole to fix the position of the kelly bar;
A moving device capable of horizontally moving the kelly bar along the longitudinal direction of the excavation hole;
An excavation apparatus comprising: a kelly bar attitude control apparatus that holds a vertical attitude of the kelly bar when the kelly bar moves horizontally by the moving device. The excavator according to claim 1,
The moving device is provided in the excavation hole, and includes a cylinder and a rod capable of moving forward and backward horizontally along the longitudinal direction of the excavation hole with respect to the cylinder.
The stabilizer is attached to the cylinder or the rod, and is attached to the tip of the support member that pivots the kelly bar, the cylinder and the rod, and advances and retreats in a direction perpendicular to the advancing and retreating direction of the rod. An excavator comprising a pressing member capable of pressing an inner wall surface of the excavation hole. The excavator according to claim 1,
The moving device is a crawler that is provided in the excavation hole and can travel horizontally along the longitudinal direction of the excavation hole,
The stabilizer is attached to the crawler, and is provided on the crawler with a support member that pivotally supports the kelly bar, and can advance and retreat in a direction orthogonal to the moving direction of the crawler to press the inner wall surface of the excavation hole An excavating apparatus comprising a pressing member. The excavator according to claim 2 or 3,
A fixed frame installed in the excavation hole,
The excavator according to claim 1, wherein the pressing member is configured to be able to press the inner wall surface of the excavation hole through the fixed frame. The excavator according to claim 1,
The moving device includes a gantry attached to the ground surface around the excavation hole, and a base that can move horizontally along the longitudinal direction of the excavation hole with respect to the gantry,
The stabilizer is attached to the base, and includes a reaction force member inserted into the excavation hole, and a support member that pivotally supports the kelly bar and presses the reaction force member. apparatus. A kerry bar that rotates about the vertical direction as an axis, and is attached to the tip of the kelly bar, rotates along with the rotation of the kelly bar, and can be opened and closed in the radial direction, and supports the kelly bar and is formed on the ground. A stabilizer installed inside the rectangular excavation hole and pressing the inner wall surface of the excavation hole to fix the position of the kelly bar, and maintaining the vertical posture of the kelly bar, A wall pile construction method for constructing a wall pile having a widened portion that is continuous in the horizontal direction using a drilling device including a moving device that can move horizontally along the longitudinal direction,
Inserting the closed bucket into the excavation hole;
Pressing the inner wall surface of the excavation hole to fix the position of the stabilizer;
Forming a widened space on the inner wall surface of the excavation hole by rotating the kelly bar with the bucket open;
While performing the step of forming the widening space, horizontally moving the kelly bar by the moving device to form a wall pile excavation hole having a widening space continuous in the horizontal direction;
A method for constructing a wall pile, comprising: placing concrete in a wall pile excavation hole having a continuous widening space to form a wall pile having a continuous widening portion. A wall pile constructed by the wall pile construction method according to claim 6.

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