JP2006177156A - Soil improvement apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a soil improvement apparatus which is good in soil improving efficiency and can make its excavation shaft penetrate the ground at an arbitrary angle. <P>SOLUTION: A link device 211 formed of a 4-node rotation link mechanism is arranged at the tip of a boom 205 of a base machine 201, a hydraulic motor 213 is installed to the link device 211, and the excavating shaft 1 having an excavating blade 11 is connected to a rotating shaft of the motor. The link device 211 is driven by a hydraulic cylinder 210 attached to a front-side boom 204. Thus, by operating the hydraulic cylinder 210, the link device 211 is dislocated, and the axial J direction of the excavator shaft 1 can be adjusted. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a ground improvement device, and more specifically, in civil engineering, construction foundation work, etc., a lime-based or cement-based slurry-like solidifying agent (hereinafter also simply referred to as a solidifying agent) while excavating the ground into a columnar shape or the like. The present invention relates to a ground improvement device for solidifying, forming, and improving the ground by discharging, mixing, stirring and solidifying the solidifying agent and excavated soil.

  A conventional ground improvement device of this type is known as a typical machine in which a base machine (traveling device) equipped with a tiltable leader is provided with an excavating shaft (rotating drive shaft) that rotates and moves up and down. Yes. In this, the excavation shaft has an excavation blade at the tip, and the upper end of the excavation shaft is connected to the rotation shaft of a rotation driving means such as a hydraulic motor that moves up and down along the leader.

  Therefore, when using such a ground improvement device, the leader is made vertical on the site, the excavation shaft arranged in parallel with it is moved downward, the excavation blade is penetrated into the ground, and excavation is performed. A slurry-like solidifying agent is injected while agitating and mixing the excavated soil with a blade and a stirring blade. Then, after moving the excavation shaft up and down an appropriate number of times, the excavation shaft is pulled up and the mixed agitation site is consolidated to improve the soft ground into a columnar shape.

  By the way, in such a ground improvement, it is necessary to carry out the columnar improvement at a number of locations so as to correspond to, for example, the foundation of a building to be built on one site of the soft ground. Therefore, in the conventional ground improvement device, when the construction of the one columnar improvement site (one excavation site) is completed, the base machine is moved to the next excavation site, and if necessary, the vertical is re-exposed. And the construction of one whole field was performed by repeating such a process one after another.

  As described above, in the conventional ground improvement, there is a problem that the time loss is large and the construction efficiency is low, because the base machine needs to be moved for each excavation site in one site.

  In addition, in a base machine equipped with this kind of tiltable leader, in order to maintain balance, the principle is to keep the leader substantially vertical, and even if tilted, the tiltable angle is small. For this reason, the request | requirement of making a drilling shaft penetrate perpendicularly to an inclined surface like a slope, for example was not able to be met. In addition, this type of base machine is special and not versatile, so it is expensive in itself, resulting in an increase in construction cost.

  The present invention has been made in view of the above-described various problems, and provides a ground improvement device that can efficiently perform the improvement work in an improvement site of one soft ground, and further a ground that can penetrate an excavation shaft at an arbitrary angle. It is to provide an improved device.

  In order to achieve the above object, a ground improvement device according to claim 1, wherein the base machine (base machine with a traveling device) includes a boom that can be expanded and contracted by a sliding method or a bending method and whose tip is movable up and down. A rotation driving means is provided for the boom, and an excavation shaft provided with excavation blades is connected to the rotation shaft of the rotation driving means.

  In the ground improvement device according to the above means, since the boom can be expanded and contracted and the tip can be moved up and down, the base machine can improve the ground at a plurality of locations without moving within the extendable range of the boom. Therefore, unlike the conventional case, it is not necessary to move the base machine for each excavation site at one site, so that the construction efficiency can be dramatically improved with little time loss. In the present invention, the boom includes an arm. The rotation driving means is typically a hydraulic motor, but is not limited thereto.

  In the above means, the rotation driving means may be provided in a suspended shape (hanging shape) on the boom via a turning pair mechanism (hinge mechanism). In this case, since the excavation shaft is connected to the rotation shaft of the rotation driving means, the excavation shaft is held vertically by its own weight. Therefore, when penetrating the excavation shaft vertically, it is possible to save time and effort for generating the vertical shaft each time. Moreover, since this type of base machine can be used as a construction vehicle such as a mobile vehicle with a crane or a backhoe, the ground improvement device of the present invention can be realized at low cost.

  Further, the rotation drive means may be provided on the boom so that the axial direction of the rotation shaft can be adjusted via a link mechanism, and the excavation shaft is coaxially connected to the rotation shaft. Good. In this case, since the excavation shaft is coaxially connected (fixed) to the rotation shaft, the angle at which the excavation shaft can penetrate into the ground can be arbitrarily controlled by controlling the link mechanism. Therefore, even on an inclined surface such as a slope, the excavation shaft can penetrate perpendicularly to the inclined surface.

  According to the ground improvement device of the present invention, since the boom can be expanded and contracted and the tip can be moved up and down, the ground can be improved at a plurality of locations without moving the base machine within the extendable range of the boom. . Therefore, it is not necessary to move the base machine for each excavation site in one site as in the prior art. In addition, when penetrating the excavation shaft vertically, it is possible to save the trouble of generating the vertical each time, so that the construction efficiency can be dramatically improved. In addition, since a versatile base machine can be used, not only the ground improvement device but also a reduction in construction cost is expected.

  Furthermore, according to the ground improvement device of claim 3, since the excavation shaft can be penetrated at an arbitrary angle, the excavation shaft can be penetrated perpendicularly to the inclined surface. You can also do it.

  An embodiment of a ground improvement device according to the present invention will be described in detail with reference to FIG. In the figure, reference numeral 100 denotes a ground improvement device, a base machine (traveling device) 101 is a track type, a boom 105 is supported on a swivel 107 that can be swung in a sliding manner, and can be expanded and contracted. With this control, it is possible to rotate around its axis (axis perpendicular to the drawing) around the pin P1 of the base (the central part of the turning pair mechanism), and the inclination angle can be adjusted. In addition, the code | symbol P in a figure has shown the center part (pin) of the turning pair mechanism (hinge mechanism) of each part. Further, a hydraulic motor 113 serving as a rotation driving means is attached to the tip end portion 106 of the boom 105 by a dead weight by means of a pin P2 via a turning pair mechanism. The hydraulic motor 113 includes a shaft joint 117 that transmits rotational driving below a rotation shaft (not shown), and the upper end of the excavation shaft 1 is connected to the shaft joint 117. Thus, the excavation shaft 1 is suspended from the distal end portion 106 of the boom 105 via the pin P2 (rotating pair mechanism) and the hydraulic motor 113, and is rotatably held.

  Further, the excavation shaft 1 has a substantially cylindrical shape (hollow columnar shape), and an excavation blade 11 having a predetermined diameter (length) D and having a V shape in a side view is fixed to a lower end portion thereof, and excavation is performed above. A plurality of stirring blades 12 and 12 having a smaller diameter than the blade 11 are fixed. In addition, although not shown in the figure, near the tip of the excavation shaft 1, a discharge port for a solidifying agent is provided, and the excavation shaft is supplied from a pumping source (not shown) mounted on the base machine 101 through a pipe (not shown). It is comprised so that it may discharge in excavated soil through the 1 internal hole. Although not shown in detail, the shaft joint 117 is configured so that a solidifying agent is fed into the excavating shaft 1 through the inside thereof.

  Thus, the boom 105 is swung, expanded or contracted, or tilted so that the excavation shaft 1 is suspended at a desired position (excavation site) at the site. At this time, the excavation shaft 1 can swing integrally with the hydraulic motor 11 around the pin P2 connecting the hydraulic motor 113 to the boom 105 around the axis of the pin. It is held vertically. Then, the lower end portion of the excavation shaft 1 is grounded to the ground G, the hydraulic motor 113 is rotationally driven to rotate the excavation shaft 1, and the boom 105 is gradually tilted downward. By doing so, excavation of the ground G is started by the excavating blade 11. In this excavation process, the boom 105 is tilted downward so as to excavate to a desired depth while discharging the solidifying agent from the outlet. Note that the boom 105 is appropriately shortened according to the inclination angle so that the excavation shaft 1 is held substantially vertically during the downward movement of the excavation shaft 1. By doing so, the excavation site is excavated in a substantially vertical column shape, and the excavated soil and the solidifying agent are mixed and stirred.

  Next, when the mixing and stirring of the excavated soil by the rotation and downward movement of the excavation shaft 1 is finished, the excavation shaft 1 is moved up and down an appropriate number of times while being appropriately rotated. At this time, the boom 105 is appropriately expanded and contracted according to the inclination angle so that the vertical of the excavation shaft 1 is ensured as much as possible. Finally, the boom 105 is tilted upward while appropriately adjusting its length, and the excavation shaft 1 is pulled out. Thus, the ground improvement of one excavation site is completed and waiting for natural consolidation.

  Subsequently, the boom 105 is turned or expanded and contracted so that the excavation shaft 1 is positioned at the next excavation site, and excavation is performed as before. As described above, in this embodiment, since a plurality of excavation parts can be excavated one after another within the range in which the boom 105 can be swung and expanded and contracted without changing the position of the base machine 101, construction efficiency can be dramatically improved. . Moreover, during excavation, the excavation shaft 1 is held vertically by its own weight. Therefore, excavation can be started very simply and quickly. If the part to be excavated is out of the reach of the boom 105, the base machine 101 may be appropriately moved and moved, and excavation may be continued one after another based on the new position. In this embodiment, the truck is used as a base machine, and the truck is provided with a crane. The cost of the apparatus can be expected to be reduced.

  Now, an embodiment of the ground improvement device according to the third aspect of the present invention will be described with reference to FIGS. However, the ground improvement device 200 of this embodiment is different from the above embodiment in that the base machine 201 is a crawler system, but there is no essential difference, and therefore, the difference will be mainly described. That is, the ground improvement device 200 according to the present embodiment includes a base machine in which a boom 205 includes a proximal boom 203 and a distal boom (arm) 204 pinned to the distal end thereof, and expands and contracts in a folding manner. A proximal boom 203 is attached to the front part of the turntable 207 of the 201. The rod of the hydraulic cylinder 208 attached to the front portion is connected (pinned) to the proximal end boom 203, and the rod of the hydraulic cylinder 209 attached to the proximal end boom 203 by pinning is connected to the distal end boom 204. By being connected and operating each, the inclination angles of the base end side boom 203 and the front end side boom 204 change and bend, and the front end portion 206 can be moved up and down.

  A link device 211 made up of a four-bar rotation chain mechanism is formed at the distal end portion 206 of the boom 205, and the rod 210 a of the hydraulic cylinder 210 attached to the distal end side boom 204 drives the link device 211. It is connected to. The link device 211 is provided with a hydraulic motor 213 serving as a rotational drive means, and the link device 211 is displaced by expanding and contracting the rod 210a of the hydraulic cylinder 210. For example, as shown in FIG. The rotation axis (not shown) and the axis J direction of the excavation shaft 1 can be adjusted. The excavating shaft 1 including the excavating blade 11 and the agitating blade 12 is coaxially connected to the rotating shaft of the hydraulic motor 213 via the shaft joint 217 in the same manner as in the above-described embodiment. That is, the base machine 201 according to the present embodiment is configured such that a hydraulic motor 213 is attached instead of a bucket attached to a tip side boom 204 in a hydraulic excavator such as a backhoe, and the upper end of the excavation shaft 1 is connected to the rotation shaft.

  In this embodiment, when the ground is improved, the base machine 201 is stopped at a predetermined position, the hydraulic cylinders 208, 209, and 210 are appropriately operated, and the excavation shaft 1 becomes vertical at the site to be a desired position ( Hold it so that it exists at the excavation site. Then, the lower end portion of the excavation shaft 1 is grounded, and the excavation shaft 1 is rotated by driving the hydraulic motor 213. At this time, the boom 205 is operated and the hydraulic motor 213 is gradually pushed down, and the link device 211 is appropriately operated by the hydraulic cylinder 210 to hold the digging shaft 1 vertical. By rotating and pushing down the excavation shaft 1 in this way, the excavation blade 11 and the stirring blade 12 can excavate the ground and mix and agitate as in the above-described embodiment.

  In this embodiment, the excavation shaft 1 is fixed to the hydraulic motor 213 via a shaft joint 217. Therefore, the angle of the axis J when the rotating shaft of the hydraulic motor 213 and the excavating shaft 1 penetrate (downward movement) is adjusted by the operation of the link device 211 and the boom 205 to which the hydraulic motor 213 is attached. Thus, during the excavation process, the boom 205 is secured so that the excavation shaft 1 is lowered to a desired depth while ensuring the vertical of the excavation shaft 1 by operating the link device 211 and the boom 205 and discharging the solidifying agent from the discharge port. And the link device 211 may be controlled to excavate, mix and stir.

  In this embodiment, the excavation shaft 1 is connected to a hydraulic motor 213 fixed to the tip ends of the booms 203 and 204 via the link device 211. Therefore, as shown in FIG. It is easy to penetrate J as an arbitrary angle direction. Therefore, the excavation shaft 1 can be penetrated perpendicularly to the slope, and the degree of freedom in construction is high. Incidentally, in the embodiment of FIG. 1, the excavation shaft is suspended, so the excavation shaft does not become oblique as it is, but if the tip (excavation blade) part is beginning to penetrate into the ground, the boom is appropriately By extending and contracting, the excavation shaft can be obliquely penetrated. Since the ground improvement device 200 of this embodiment is a crawler type traveling device, it is suitable for work on soft ground or rough terrain, but it can of course be embodied as a wheel type.

  In the above embodiment, the drilling shaft and the stirring blade are fixed to the drilling shaft. However, only the drilling blade may be attached to the drilling shaft. Further, the drilling shaft may be provided with a co-rotation preventing blade having a diameter larger than that of the drilling blade and rotatable around the drilling shaft, or provided with a known stirring blade capable of three-dimensional mixing and stirring. Also good.

The side view which shows schematic structure of embodiment of the ground improvement apparatus of this invention. The side view which shows schematic structure of embodiment of the ground improvement apparatus of Claim 3. The side view which inclined the angle of the excavation axis | shaft with the ground improvement apparatus of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Excavation shaft 11 Excavation blade 100, 200 Ground improvement apparatus 101, 201 Base machine 105, 205 Boom 113, 213 Hydraulic motor (rotation drive means)
P2 pin (around pair mechanism)
211 Link mechanism J Rotation axis of hydraulic motor and axis of excavation axis

Claims (3)

  Rotation drive means is provided for the boom of the base machine provided with a boom that can be expanded and contracted by a slide method or a bending method and whose tip is movable up and down. Ground improvement device characterized by connecting shafts.   2. The ground improvement device according to claim 1, wherein the rotation driving means is provided in a suspended manner on the boom via a turn-around pair mechanism. The rotation drive means is provided in the boom so that the axial direction of the rotation shaft can be adjusted via a link mechanism, and the excavation shaft is coaxially connected to the rotation shaft. Ground improvement device.

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