JP2007077649A - Soil improving device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve the excavating speed of a linear part by a small, lightweight excavator of high rigidity and to continuously construct an underground continuous wall with an angular part by horizontally rotating the excavator with no trouble to change its excavating direction in a soil improving device mounted through a rotating device to the arm tip of a back hoe or the like of a shovel type excavating machine used as a base machine. <P>SOLUTION: The soil improving device is suspended from the arm tip of the base machine through the rotating device, wherein a cutter post 13 suspended from a lower part of the rotating device is formed in an H-shape cross section with a pair of steel side plates arranged in parallel to be able to guide a pair of endless chains 14, and a steel intermediate plate which connects the pair of steel side plates integrally. Both side parts of each steel side plate are provided with guide rails fitted with recessed grooves of the endless chain to guide, and horizontal bit plates 15 for connecting the pair of endless chains 14 are provided at predetermined spaces in a chain circulating direction. The surface of the bit plate 15 is provided with excavating blades 19. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention is a chain cutter for excavating the ground into a groove shape while discharging the solidified material liquid, and creating an underground continuous wall-shaped ground improvement body such as soil cement in which the solidified material liquid and the excavated soil are agitated and mixed. In particular, it is applied to foundations for small and medium-sized buildings or water barrier walls, impermeable walls, retaining walls, etc. It also applies effectively.

  A TRD method using a groove excavator is known as this type of ground improvement method. A chain cutter consisting of a cutter post and an endless chain with a drilling blade is provided on the base machine via a leader or the like so as to be movable up and down. A chain cutter penetrating inside is horizontally traversed and excavated while discharging a solidified liquid such as cement milk to form a soil cement underground continuous wall. Although such a TRD method has many advantages, the equipment is large, the cost is high, it is difficult to apply to medium- and small-scale ground improvement, and a small and light ground improvement machine is desired.

  Prior art documents related to the present invention include Patent Documents 1 to 4. The invention of Patent Document 1 is a ground improvement machine for constructing a ground improvement structure for the purpose of improving the soft ground that serves as the foundation of the ground structure and preventing liquefaction, and is based on a backhoe that is an excavator excavation machine. As a machine, a stirring / mixing head (with an endless chain with stirring blades wrapped around the frame) is attached to the end of its arm via a turning mechanism. Can be changed.

  The invention of Patent Document 2 relates to a rotary solidification material discharge device for a ground improvement machine, and a drilling device is attached to the tip of a backhoe arm, and this drilling device is attached to each of a pair of left and right drive sprockets, support frames, and driven sprockets. An endless chain is wound around, and a stirring blade is attached to each endless chain, and a rotary type solidified material discharge device is disposed between a pair of left and right endless chains.

  The invention of Patent Document 3 is a continuous excavation method and device for a groove having a corner portion by a trench excavator of the TRD method, and the groove excavator is provided on the upper revolving body of a crawler base machine so as to be movable up and down via a leader. The groove excavator is constructed by winding an endless chain with an excavating blade around a vertical split unit (cutter post) having sprockets on the upper and lower sides, and excavating a linear groove by running the base machine in a straight line. In this section, the groove is continuously excavated by turning the upper turning body, turning the groove excavator, or the like.

The invention of Patent Document 4 is a method and apparatus for digging a curved groove by a trench excavator of the TRD method, and the curved groove is excavated by swirling with the groove digging apparatus similar to the invention of Patent Document 3 penetrating into the ground. In this case, the ground to which the portion other than the excavating blade of the trench excavating device directly hits is excavated in advance by a hole excavating means and collapsed in advance.
JP 2004-108136 A Japanese Patent No. 3178789 JP-A-6-158663 Japanese Patent Laid-Open No. 9-296478

  In the ground improvement machine disclosed in Patent Document 1, the endless chain is guided by a guide roller extending laterally from a frame (post), and a predetermined tension is applied to the endless chain by a tension roller supported by a leaf spring on the frame side. It has a structure. Therefore, it is necessary to secure a desired excavation width as a structure in which the plate portion (stirring blade) provided with the excavating blade is greatly extended from the center endless chain to the left and right. In addition, since the width of the frame is small and the rigidity is low compared to the left and right spreading width of the plate portion of the stirring blade, there is a limit to increasing the excavation speed. Further, when trying to turn, since the chain protrudes most at the portion of the tension roller supported by the leaf spring, this portion is burdened during turning, and the endless chain may be damaged.

  The invention of Patent Document 2 is not a device having a turning mechanism in the head portion of the excavator, but has a structure in which a portal frame is provided in the head portion, and the excavator is suspended from the portal frame, and the endless chain is The support frame (side plate) that circulates around is arranged separately on the left and right. Therefore, although the rigidity of the side plate as the cutter post is higher than that in the case of the above-mentioned Patent Document 1, the width of the side plate is smaller and the rigidity is lower than the width of the left and right ends of the endless chain. There was a limit to raising it.

  The invention of Patent Document 3 is a large-sized groove excavator, and the groove excavator has a structure in which an endless chain is circulated around the short side of a unit (cutter post) having a long square cross section. However, if the groove excavator is rotated at the leader portion, the long side of the unit (cutter post) having a long cross section is described in Patent Document 4 as a disadvantage of the prior art. Forced to be pressed against the ground. Since this portion does not have a digging blade, the digging resistance increases significantly when the portion hits the ground, and if the ground is hard, there is a possibility that turning is impossible, that is, digging is impossible.

  The invention of Patent Document 4 is also a large groove excavator, and the groove excavator has a structure in which an endless chain is circulated around a short side of a unit (cutter post) having a long square cross section. By separately installing a hole drilling device for drilling a hole, the long side without a drilling blade of a unit having a long square cross section (cutter post) does not hit the ground, and the corner portion can be continuously excavated well. However, such a groove excavator requires a large support frame for slidably supporting the groove excavator in the horizontal direction on the front surface of the base machine, and a hole excavator for excavating holes in advance is attached to the corner portion. In order to do so, it is no longer of a simple structure.

  The present invention has been made in order to solve the above-described problems. In a ground improvement device mounted on the end of an arm via a rotating device using a backhoe or the like as an excavator excavation machine as a base machine, the present invention is small and light. The excavator can improve the excavation speed in a straight excavation section with a rigid excavator, and can change the direction of excavation by rotating the excavator horizontally without any troubles. It is an object of the present invention to provide a ground improvement device that can be constructed.

  According to the first aspect of the present invention, an excavator excavating machine is used as a base machine, and is suspended from a tip of an arm via a rotating device. The rotating device can horizontally rotate the vertical axis as a rotation center axis. An endless chain with an excavating blade wound endlessly around a driving wheel and a driven wheel provided on the upper and lower sides of a cutter post hanging from the lower part of the rotating device is rotated (circulated) in the vertical direction and moved horizontally. In the ground improvement device that excavates and forms (creates) the underground continuous wall-like ground improvement body, a predetermined interval is provided so that a pair of endless chains arranged in parallel with a predetermined interval can be guided. A cutter post is composed of a pair of steel side plates arranged in parallel with each other and a steel intermediate plate integrally connecting the pair of steel side plates. A guide rail for guiding the endless chain is provided by fitting the groove in the groove, and the pair of endless chains that circulate (circulate) around the pair of steel side plates are connected to the horizontal end of the pair of endless chains. The ground improvement device is characterized in that the bit plate is provided at a predetermined interval in the circumferential direction of the endless chain, and a drilling blade is provided on the surface of the bit plate.

  The present invention is a small and light ground improvement device using a backhoe or the like of a shovel excavation machine as a base machine so that it can cope with medium and small-scale ground improvement, and a horizontal excavation direction by a rotating device with a simple structure at the tip of an arm. In the ground improvement device that can easily change the shape of the cutter post, by making the cutter post into a H-shaped cross section from a pair of left and right steel side plates and a steel intermediate plate, a cutter post that is more compact and lightweight and at the same time has high rigidity. It is intended to be obtained. When a pair of left and right endless chains are circulated around a pair of left and right steel side plates that are small, light and highly rigid, when excavating the ground in a straight groove, the circulation speed of the endless chain, that is, the device traverses in the ground The excavation speed can be increased. In addition, by providing guide rails on the pair of left and right steel side plates, the endless chain can be arranged in a pair of left and right, and by guiding the guide rail by fitting a groove in the endless chain, the circulation speed of the endless chain The excavation speed can be increased. Furthermore, a wide excavation groove width can be obtained by connecting a pair of left and right endless chains with a bit plate with an excavation blade.

  According to a second aspect of the present invention, in the ground improvement device according to the first aspect, the chain member of the endless chain is provided with a pair of left and right guide plates that sandwich the guide rail from both sides. It is a ground improvement device.

  A pair of left and right plates of the chain member of the endless chain is integrally provided with a bowl-shaped guide plate, and a pair of left and right guide plates forms a groove guide for the endless chain. Circulating movement between the guide rail, drive wheel and driven wheel reduces the risk of biting excavated soil between the chain and the guide rail, and not only does not hinder the increase in circulation speed and excavation speed. Further, it is possible to prevent the endless chain from being removed.

  According to a third aspect of the present invention, in the ground improvement device according to the first or second aspect, the steel post of the cutter post is formed with a window portion by an opening at a predetermined interval in the vertical direction. It is the ground improvement apparatus characterized by being made.

  According to a fourth aspect of the present invention, in the ground improvement device according to the third aspect, the steel intermediate plate between the window portions protrudes in a mountain shape in the digging direction and guides the excavated soil to the window portion. A ground improvement device characterized in that an excavation promoting member is provided.

  By installing a window part or window part and a digging promotion member on the steel intermediate plate of the cutter post, the excavated earth and sand can be smoothly moved and discharged from the window part to the rear excavated side, traversing the ground. The excavation speed to be made can be made faster.

  According to a fifth aspect of the present invention, in the ground improvement device according to any one of the first to fourth aspects, the bit plate is attached to the chain member of the endless chain via a taper member. It is the ground improvement apparatus characterized by inclining with respect to the up-and-down movement direction.

  By attaching the bit plate to the endless chain via a taper member such as a taper washer, and tilting the front end of the bit plate so that the front end of the bit plate opens with respect to the descending excavation direction of the endless chain, the excavation speed can be increased. The ground improvement device can be automatically advanced without being moved by an arm or the like, and the backward tilting posture in which the lower part moves backward can be automatically corrected to return to the vertical posture.

  A sixth aspect of the present invention is the ground improvement device according to any one of the first to fifth aspects, wherein both end portions of the bit plate protrude outward from a pair of endless chains. It is a ground improvement device.

  If the bit plate arranged orthogonal to the direction of digging is protruded greatly outside the pair of left and right endless chains, and the width including the guide rail of the steel side plate is smaller than the length of this bit plate, The excavation groove width is increased, and the ground improvement device can be smoothly rotated horizontally around the vertical device central axis as a rotation axis, so that the direction of excavation can be changed smoothly.

  According to a seventh aspect of the present invention, in the ground improvement device according to any one of the first to sixth aspects, the excavation blades are arranged on the surface of the bit plate at a predetermined interval. The ground improvement device is characterized in that the position of the excavation blade is different between adjacent bit plates.

  By exchanging the position of excavation blades (chip claws, etc.) with adjacent bit plates and arranging them so that the entire excavation groove can be evenly excavated, excavation can be performed with a small torque even on hard ground.

  Since the present invention is configured as described above, the following effects can be obtained.

  (1) A small, lightweight and highly rigid excavator can improve the excavation speed in a straight excavation part, and can easily create an underground continuous wall-shaped ground improvement body made of soil cement etc. at low cost. An optimal ground improvement device for medium and small scale ground improvement can be obtained.

  (2) The excavator can be rotated horizontally without trouble to change the direction of excavation, and the underground continuous wall with corners can be continuously created. An improved body can be constructed at low cost.

  Hereinafter, the present invention will be described based on an embodiment shown in the drawings. This embodiment is an example applied in the case of constructing a medium- and small-scale soil cement underground continuous wall. FIG. 1 is a side view showing an example of the entire ground improvement machine equipped with the ground improvement device of the present invention.

  In FIG. 1, a backhoe 1 that is an excavator excavating machine is used as a base machine, and a head portion of a ground improvement device 10 including a chain cutter excavator of the present invention is detachably attached to the tip of a boom 2 and an arm 3. . A rotating device 11 which will be described in detail later is provided on the upper portion of the head portion. The upper portion of the rotating device 11 can be attached to the tip of the arm 3 with one touch, and the ground improvement device 10 is suspended vertically. Can do. The rotation device 11 can horizontally rotate the ground improvement device 10 with the vertical device central axis as the rotation center axis, and can turn the horizontal improvement direction of the ground improvement device 10 in all directions.

  FIG. 2 is a front view and a side view showing an example of the ground improvement device of the present invention. The ground improvement device 10 is mainly composed of a portal-type head frame 12, a cutter post 13, and a pair of left and right endless chains 14, 14. And a plurality of bit plates 15. The endless chain 14 is wound around an upper driving sprocket (driving wheel) 16 and a lower driven sprocket (driven wheel) 17, and the driving sprocket 16 is driven by a motor 18, guided by the cutter post 13 and circulated in the vertical direction ( Circulate). The circulation speed of the endless chain 14 is, for example, 1.5 m to 2 m per second. Excavation blades 19 project from the surface of the bit plate 15. A solidifying material liquid supply pipe 20 is disposed from the head portion to the lower portion of the cutter post 13. A cover 21 is provided on the head portion protruding to the ground.

  FIG. 3 is a plan view, a side view, and a front view showing an example of the cutter post 13 according to the present invention. In the present invention, the cutter post 13 has an H-shaped section and is arranged in parallel at a predetermined interval. The pair of endless chains includes a pair of high-rigidity steel side plates 30 that circulate around, and a pair of high-rigidity steel intermediate plates 31 that integrally connect the pair of steel side plates 30, 30. The light and strong cutter post 13 is obtained by the steel side plates 30 and the steel intermediate plates 31 on both sides. Guide rails 32 projecting at a predetermined length are provided on both side surfaces of each steel side plate 30. The cross-sectional dimension of the cutter post 13 including the guide rail 32 is, for example, 400 mm × 400 mm.

  The steel intermediate plate 31 may be a simple flat plate, but it is more preferable to have a structure as shown in the illustrated example. In other words, a window portion 33 formed by an opening and a digging (transverse) promotion member 34 formed by a sealed chevron projecting in the digging direction are provided, and the excavated soil is smoothly moved to the rear after excavation and discharged. Like that. Thereby, the excavation speed traversing in the ground can be further increased. The window 33 and the digging promotion member 34 are provided alternately in the vertical direction. The chevron protrusions of the digging promotion member 34 are preferably provided on both surfaces of the steel intermediate plate and are inclined surfaces that are inclined toward the window 33.

  The solidifying material liquid supply pipe 20 passes through the upper motor cover 35, the intermediate portion and the lower digging promotion member 34, and is disposed along the surface of the steel intermediate plate 31. The driven sprockets 17 are respectively disposed at the lower portions of the pair of left and right steel side plates 30 and 30 and are pivotally supported at the lower portion of the steel intermediate plate 31. A bifurcated discharge port 36 is provided at the lower portion of the supply pipe 20 positioned between the pair of left and right driven sprockets 17, so that the solidified liquid is discharged toward the endless chains on both sides.

  As shown in FIG. 2, the cutter post 13 as described above is fixed to the head-shaped head frame 12 at the top. That is, the lower part of the gate-shaped head frame 12 is attached to the upper outer surface of the pair of left and right steel side plates 30 via the support bracket. A pair of left and right drive sprockets 16, 16 are disposed in the portal-type head frame 12, and are rotated by a lower motor 18 via a bevel gear box 22. The motor 18 is a hydraulic motor, but may be an electric motor or the like. However, a hydraulic motor is preferable in terms of driving force.

  FIG. 4 is a plan view, a side view, and a cross-sectional view showing an example of the endless chain 14 according to the present invention. In the present invention, the narrower chain of the two types of chain members 40 and 41 constituting the roller chain is shown. An intermediate portion of the pair of left and right plates 40a of the member 40 is protruded greatly downward to form a bowl-shaped guide plate 42 that sandwiches the guide rail 32 from both sides. The endless chain 14 circulates and moves while the guide rail 32 or the driving wheel / driven wheel is sandwiched between the pair of left and right guide plates 42, 42, thereby preventing the endless chain 14 from being removed and between the chain and the guide rail. The risk of biting excavated soil is reduced, and the excavation speed can be increased. A sand removal hole 43 is formed in the guide plate 42. If this hole 43 is filled with grease or special oil having a long duration, the frictional resistance can be reduced.

  A pair of left and right plates 41a of the wider chain member 41 is provided with a mounting plate 44 protruding laterally from the top, and a bit plate is mounted on the mounting plate 44 with bolts. The chain member 41 with the mounting plate 44 is arranged at a predetermined interval, and the bit plate is mounted at a desired interval.

  FIG. 5 is a front view, a cross-sectional view, and a side view showing an example of the configuration of the bit plate 15 according to the present invention. In the present invention, a drilling blade (chip claw in the illustrated example) 19 is provided on the surface of the bit plate 15. A plurality of protrusions are provided at predetermined intervals in the longitudinal direction of the plate.

  Further, both end portions of the bit plate 15 project outside the pair of left and right endless chains 14 and 14. At the same time, the width (for example, 400 mm) of the steel side plate 30 including the guide rails 32 is smaller than the length (for example, 600 mm) of the bit plate 15. By comprising in this way, a digging groove width becomes large, the ground improvement apparatus 10 can be smoothly horizontally rotated by making a vertical apparatus central axis into a rotating shaft, and the direction change of an excavation direction can be performed smoothly.

  In addition, as shown in FIG. 2, the position of the excavation blade 19 attached to the surface of the bit plate 15 is different for each bit plate 15. For example, by exchanging the position of the digging blade 19 with the adjacent bit plate 15 and arranging the digging blade so that uniform digging can be performed over the entire width of the digging groove, excavation can be performed with a small torque even on hard ground.

  FIG. 6 is a side view / perspective view showing an example of another method of attaching the bit plate 15 according to the present invention. Depending on the ground condition at the construction site, a taper is provided between the bit plate 15 and the chain attachment plate 44. The bit plate 15 is tilted and attached by sandwiching the washer 45. Depending on the ground condition at the construction site, this angle of inclination is increased by using a tapered washer 45 having an angle (for example, 5 ° to 15 °). In addition, as shown in FIG. 6, since the inclined surface 15a by chamfering is formed at the front end portion in the descending excavation direction of the bit plate 15, and the sharp tip portion is provided, the resistance received by the excavating soil is reduced. Drilling speed can be increased.

  As shown in FIG. 2 (b), the bit plate 15 is tilted so that the front portion in the descending excavation direction is opened, so that the excavation speed can be increased and the ground improvement device 10 can be armed. It is possible to automatically move forward without moving it, and to automatically correct the backward tilted posture in which the lower part moves backward and return it to the vertical posture.

  FIG. 7 is a front view and a side view showing details of the drive sprocket 16 and the driven sprocket 17, in which the tooth space of the drive sprocket 16 is widened so that the rollers of the roller chain do not bite the soil. The driven sprocket 17 is a disk without teeth so as not to bite the soil. Further, the end of the guide rail 32 is connected to the driven sprocket 17 as an arc so as not to bite the soil.

  FIG. 8 shows an example of a tensioning device for the endless chain 14. The tensioning bolt 50 is used to tension the endless chain 14 so as not to loosen. The lower part of the tension bolt 50 is fixed to the horizontal plate 12a of the head frame 12 to which the upper end of the cutter post 13 is fixed. The upper part of the tension bolt 50 penetrates the fixing plate 51 to which the motor 18 is attached. Fixed. The tension of the endless chain 14 can be adjusted by rotating the fixing nut 52 and adjusting the position of the fixing plate 51 up and down.

  FIG. 9 is a front view showing an example of a cleaning device for the endless chain 14 by a water flow. A jet water supply pipe 60 is arranged on the upper part of the gate-type head frame 12 and is directed to a pair of left and right endless chains. Jet water is sprayed from the end, and the excavated soil attached to the endless chain is washed to further increase the excavation speed.

  FIG. 10 is a side view showing the details of the cover 21 shown in FIG. 2, where the part including the motor part and the drive wheel is covered with the cover 21 for safety, and the excavated soil pulled up by the endless chain is surrounded by It covers so as not to scatter. When performing a tensioning operation using a tension bolt, a replacement operation of an endless chain, or the like, an operation of removing the cover 21 is necessary. For this reason, the cover 21 is detachable. A hinge 70 is provided on the upper portion of the cover 21, and the protruding piece 71 is inserted into the insertion hole of the upper beam of the head frame 12, and the protruding piece 72 provided on the lower portion is engaged with the engaging piece 73 of the leg portion of the head frame 12. Lock and fix. When removing the cover 21, the cover 21 is slightly lifted, lifted up, and pulled down and removed in the procedure shown in the figure.

  FIG. 11 is a front view and a partial enlarged cross-sectional view showing details of the rotating device 11 shown in FIG. 1. A fixed gear 81 is fixed to a lower portion of a suspension member 80 that is detachably attached to the tip of an arm of a backhoe. An upper rotary shaft 82 of the head frame 12 is inserted into the fixed gear 81 and is supported in a freely suspended manner by radial and thrust bearings. A substrate 83 of the head frame 12 is provided with a geared motor (hydraulic motor or electric motor) 84 with a speed reducer and a planetary gear 85 driven to rotate by this, and the planetary gear 85 is fixed by rotating the planetary gear 85. Revolving around 81, the head frame 12, that is, the ground improvement device 10, rotates horizontally as the central axis of the vertical device central axis.

  Using the base machine and ground improvement device configured as described above, the solidified material liquid and the excavation are excavated by circulating and moving the endless chain in the ground while discharging the solidified material liquid from the lower part in the ground. An underground continuous wall-like ground improvement body is constructed by soil cement mixed with soil. Basically, the base machine should be kept stationary without moving, and the ground improvement body should be automatically excavated. The base machine may be moved, or can be dug by operating the arm.

  FIG. 12 shows a situation where a soil cement underground continuous wall is constructed linearly using the apparatus of the present invention. The ground improvement device automatically goes straight, or goes straight by the operation of the arm, and with the excavation, the ground improvement device in the vertical posture is horizontally rotated by the rotating device so that the bit plate is positioned at the front.

  FIG. 13 shows a situation in which a soil cement wall is constructed in a different direction from the previously constructed straight portion by rotating the ground improvement device with a rotating device. For example, foundations of buildings such as detached houses, lightweight steel apartments, supermarkets and warehouses can be constructed.

It is a side view which shows an example of the ground improvement machine equipped with the ground improvement apparatus of this invention. It is an example of the ground improvement apparatus of this invention, (a) is a front view, (b) is a side view. It is an example of the cutter post of this invention, (a) is a top view, (b) is a side view, (c) is a front view. It is an example of the endless chain of this invention, (a) is a top view, (b) is a side view, (c) is sectional drawing. It is an example of the structure of the bit plate of this invention, (a) is a front view, (b) is sectional drawing, (c) is a side view. It is an example of the attachment method of the bit plate of this invention, (a) is a side view, (b) is a side view of a taper washer, (c) is a perspective view of a taper washer. 1 is an example of a drive wheel / driven wheel of an endless chain of the present invention, (a) is a side view showing the relationship between the driven wheel and a guide rail, (b) is a side view and a front view of the drive wheel, and (c) is a slave wheel. It is the side view and front view of a driving wheel. It is a front view which shows an example of the tension device of the endless chain of this invention. It is a front view which shows an example of the washing | cleaning apparatus by the water flow in the head part of this invention. It is a side view which shows the cover in the head part of this invention. It is an example of the rotation apparatus of this invention, (a) is a front view, (b) is a partial expanded sectional view. It is a top view which shows the example of the construction condition (straight part) of the apparatus of this invention. It is a top view which shows the example of the construction condition (direction change part) of the apparatus of this invention.

Explanation of symbols

1 ... Backhoe (base machine)
DESCRIPTION OF SYMBOLS 2 ... Boom 3 ... Arm 10 ... Ground improvement device 11 ... Rotation device 12 ... Head frame 13 ... Cutter post 14 ... Endless chain 15 ... Bit plate 16 ... Drive sprocket 17 ... Drive sprocket 18 ... Motor 19 ... Excavation blade 20 ... Solidification material Liquid supply pipe 21 ... Cover 22 ... Bevel gear box 30 ... Steel side plate 31 ... Steel intermediate plate 32 ... Guide rail 33 ... Window 34 ... Drilling promotion member 40 ... Chain member 41 ... Chain member 42 ... Guide plate 43 ... Hole 44 ... Mounting plate 45 ... Taper washer 50 ... Tension bolt 51 ... Fixed plate 52 ... Fixed nut 60 ... Jet water supply pipe 61 ... Nozzle 70 ... Hinge 71 ... Upper protruding piece 72 ... Lower protruding piece 73 ... Engagement Piece 80 ... Suspension member 81 ... Fixed gear 82 ... Upper rotating shaft 83 ... Substrate 84 ... Geared Ta 85 ... planetary gear

Claims (7)

An excavator excavating machine as a base machine is a ground improvement device that is suspended from the end of its arm via a rotating device and can be rotated horizontally around the vertical axis by the rotating device. An endless chain with an excavating blade wound endlessly around the drive wheels and driven wheels provided on the top and bottom of the cutter post to be moved around in the vertical direction and digging in the horizontal direction to improve the underground continuous wall-like ground improvement body In the ground improvement device that excavates and forms,
A pair of steel side plates arranged in parallel at a predetermined interval and a pair of steel side plates are integrally connected so that a pair of endless chains arranged in parallel at a predetermined interval can be guided. Cutter posts are formed from steel intermediate plates to be provided, and guide rails for guiding the endless chains are provided on both side portions of the steel side plates by fitting recessed grooves of the endless chains. A pair of endless chains that circulate around the periphery is provided with a horizontal bit plate that connects the pair of endless chains at a predetermined interval in the circumferential direction of the endless chain, and a drilling blade is provided on the surface of the bit plate. A ground improvement device characterized by that.   2. The ground improvement device according to claim 1, wherein the chain member of the endless chain is provided with a pair of left and right guide plates that sandwich the guide rail from both sides.   The ground improvement device according to claim 1 or 2, wherein the steel post of the cutter post is formed with windows by openings at predetermined intervals in the vertical direction. apparatus.   The ground improvement device according to claim 3, wherein the steel intermediate plate between the window portions is provided with a digging promoting member that protrudes in a mountain shape in the digging direction and guides the excavated soil to the window portion. Features ground improvement device.   5. The ground improvement device according to claim 1, wherein the bit plate is attached to the chain member of the endless chain via a taper member, and is inclined with respect to the vertical movement direction of the endless chain. A ground improvement device characterized by having   The ground improvement device according to any one of claims 1 to 5, wherein both ends of the bit plate protrude outward from a pair of endless chains.   The ground improvement device according to any one of claims 1 to 6, wherein excavation blades are arranged at predetermined intervals on the surface of the bit plate, and the positions of the excavation blades differ between adjacent bit plates. A ground improvement device characterized by that.

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