JP5597232B2 - Ground improvement device and residual soil discharge suppression body of ground improvement device - Google Patents

Description

The present invention relates to a ground improvement device and a ground improvement device for strengthening the ground by forming a soil cement pillar (hereinafter referred to as “soil cement pile”) in the ground by stirring and mixing the ground excavated soil and a solidified material such as cement milk. With regard to the remaining soil discharge control body , it is possible to greatly reduce the discharge amount of excavated residual soil and solidified material mixed residual soil generated with the construction of soil cement piles as well as strengthening the soil strength.

  The ground is excavated as a ground improvement method, and the ground excavated soil is stirred and mixed with cement-based solidified material using a mixing processor, and solidified to a predetermined strength to form a soil cement pile in the ground. There is known a ground improvement method that strengthens the ground.

  For example, Patent Document 1 discloses that a drilling blade having a drilling blade at the lower end of a rotating rod and a mixing processing machine having a plurality of stirring blades on the outer periphery of the rotating rod on the upper side is drilled to a target depth. After that, the solidified material is discharged from the tip of the rotating rod, and the mixing processing machine is rotated to gradually pull out the excavated soil while stirring and mixing with the solidified material to form a cylindrical soil cement pile in the ground. The ground improvement construction method which strengthens the ground by is described.

Japanese Patent Publication No. 5829374 JP 2011-69093 A Japanese Patent Laid-Open No. 04-185813 JP 2007-191990 A

  However, in this type of ground improvement method, a large amount of solidified material mixed soil containing solidified material such as excavated residual soil and cement milk is generated, and in particular, the solidified material mixed residual soil is treated as industrial waste, and a manifest is used for disposal. Since it was necessary to request an industrial waste contractor, there were problems such as increased processing costs. In addition, there was a problem that the site environment deteriorated by overflowing a large amount on the ground and soiling the site.

  Furthermore, the soil cement pile formed in the ground is formed by naturally solidifying the soil cement without being particularly consolidated, so that sufficient strength may not be obtained depending on the amount of solidified material injected. In addition, since the ground around the soil cement pile is not sufficiently compacted, there are cases where the expected ground strength cannot always be secured.

The present invention has been made to solve the above-described problems. A ground improvement device capable of significantly reducing the discharge amount of excavation residual soil and solidification material mixed residual soil as well as strengthening earth resistance, and a residual soil discharge suppression body of the ground improvement device are provided. It is intended to provide.

  The present invention rotates the excavating blade and the agitating blade via a rotating rod, and stirs and mixes the drilling hole and the excavated soil with the solidified material to form a soil cement pile in the drilling hole. ) To improve quality, drastically reduce the amount of excavated residual soil and solidified material mixed waste, significantly reduce the cost of disposal of the residual soil, It is possible to prevent the deterioration of the on-site environment.

  According to the present invention, although the excavated soil mixed with the solidified material is scraped up to the ground by the stirring blade, the excavated soil and the solidified material are provided by installing the residual soil discharge suppression body between the hole wall and the rotating rod. Since the contaminated soil does not overflow to the ground from the drilling holes and become residual soil, the cost required to treat these residual soil can be greatly reduced, and the environment in the site is particularly deteriorated by discharging the residual soil mixed with solidification material. There is nothing.

  In addition, since the excavated soil and solidified material purchase soil do not almost overflow from the drilling hole, the solidified material can be injected as planned for each soil cement pile, so that the soil has almost the strength as designed. Cement piles can be formed.

  In addition, the residual soil discharge suppression body is stopped between the hole wall in the drilling hole and the rotating rod, and the excavating soil is stirred and mixed with the solidified material by rotating the excavating blade and the stirring blade under the rotating blade. By forming the pile, the soil ground is consolidated through the soil cement pile and the soil cement pile, so that the earth strength can be increased and the quality can be improved.

  Further, the residual soil discharge suppressing body is attached to the rotating rod so as to be slidable in the axial direction of the rotating rod, and a fitting groove is provided at the lower end portion thereof so as to be detachably fitted to the stirring blade attached to the rotating rod. As a result, the residual soil discharge suppression body is moved to an arbitrary depth by drilling with the rotating rod, and the residual soil discharge suppression body is separated from the rotating rod at the point where the predetermined depth is reached, and stopped at that point to discharge the residual soil. A soil cement pile can be formed deeper than the restraining body to increase the earth strength.

  Further, the residual soil discharge suppression body is formed in, for example, an acorn-shaped body having a diameter substantially the same as the drilling diameter or a spindle-shaped body as illustrated in FIG. Can be reliably closed and can be smoothly moved between the hole wall and the rotating rod while rotating together with the rotating rod.

  According to the present invention, since the residual soil discharge suppression body is installed between the hole wall and the rotating rod, the excavated soil and the solidified material mixed soil overflow from the drilling hole to the ground and become residual soil. Therefore, the cost required for the residual soil treatment can be greatly reduced, and the site environment is not deteriorated such that the site is soiled due to discharge of the solidified material mixed residual soil.

  Furthermore, the soil discharge control body is stopped in the drilling hole, and the excavating blade and the stirring blade are rotated and moved up and down to stir and mix the excavated soil and the solidified material to form a soil cement pile. The ground strength (ground strength) can be increased by consolidating the surrounding ground through cement pile and soil cement pile, and quality can be improved.

BRIEF DESCRIPTION OF THE DRAWINGS It is a side view which shows one Embodiment of the ground improvement apparatus of this invention, and shows the ground improvement apparatus installed in the construction heavy machine. 1 shows the ground improvement device shown in FIG. 1, FIG. 2 (a) is a side view showing the whole, FIG. 2 (b) is a cross-sectional view taken along the line II in FIG. 2 (a), and FIG. It is a principal part enlarged view which shows the coupling | bond part of a discharge suppression body and a stirring blade. Fig. 3 (a) is a perspective view of an acorn-shaped residual soil discharge suppression body having a plurality of vertical ribs instead of a spiral rib, and Fig. 3 (b) is a spindle shape. FIG. 3 (c) is a side view of the formed residual soil discharge suppression body, and FIG. 3 (c) is a plan view of the residual soil discharge suppression body shown in FIG. 3 (a). (a)-(d) It is explanatory drawing which shows the construction procedure of the ground improvement construction method of this invention. (a), (b) is explanatory drawing which shows the construction procedure of the ground improvement construction method of this invention. (a), (b) is explanatory drawing which shows the construction procedure of the ground improvement construction method of this invention. It is explanatory drawing which shows the construction procedure of the ground improvement construction method of this invention. (a), (b) is explanatory drawing which shows the construction procedure of the ground improvement construction method of this invention.

  1 to 3 show an embodiment of the present invention, a rotating rod 1 that rotates using an auger motor (not shown) as a drive source, a drilling blade 2 that rotates together with the rotating rod 1 and drills the ground, and the excavation concerned A stirring blade 3 which is attached to the upper side of the blade 2 and rotates together with the rotating rod 1 and the excavating blade 2 to stir and mix the excavated soil with a solidified material (cement-based solidified material or the like) injected from the ground; A residual soil discharge suppression body 4 is provided between the rotary rod 1 and the hole wall, and is provided on the upper side and suppresses the excavated soil and the solidified material mixed soil (soil cement) from overflowing from the hole.

  The rotating rod 1 has a hollow continuous in the vertical direction, the hollow portion has an injection path 1a for a solidified material injected from the ground into the ground, and the tip of the rotating rod 1 is solidified to communicate with the injection path 1a. A material discharge port 1b is formed. The rotating rod 1 is installed on a slide leader 6 installed vertically on a heavy construction machine 5 so as to be movable up and down together with an auger motor.

  A plurality of excavating blades 2 are horizontally attached to the lower end of the rotating rod 1 in two or four directions, and a plurality of stirring blades 3 are horizontally attached to the outer periphery of the rotating rod 1 above the stirring blade 2.

  A plurality of excavating blades 2a project from the lower end of each excavating blade 2, and the agitating blades 3 are mounted symmetrically on both sides of the rotating rod 1 and are mounted at regular intervals in the vertical direction of the rotating rod 1. It has been.

  Further, the stirring blades 3 adjacent to each other in the vertical direction of the rotating rod 1 are attached so as to be shifted from each other by 90 in the circumferential direction of the rotating rod 1. In addition, the stirring blade 3 may be attached in two directions or four directions similarly to the excavation blade 2.

  The residual soil discharge suppression body 4 is formed in a cylindrical shape having a diameter that is substantially the same as or slightly larger than that of the excavation blade 2 and the stirring blade 3, and a lower end portion is formed in a conical shape that gradually decreases in diameter downward. Thereby, the residual soil discharge suppression body 4 is formed in a substantially acorn shape as viewed from the side as a whole.

  In addition, spiral ribs 7 and spiral blades 8 are continuously formed in the vertical direction of the residual soil discharge suppression body 4 on the outer periphery of the cylindrical portion 4a and the conical portion 4b of the residual soil discharge suppression body 4, respectively.

  The spiral rib 7 can be easily formed by a method of, for example, spirally welding a steel bar such as a round steel or a deformed reinforcing bar to the outer periphery of the cylindrical portion 4a of the residual soil discharge suppressing body 4.

  Further, as shown in FIGS. 3 (a) and 3 (c), by attaching a vertical rib 9 made of an angle material or the like to the outer periphery of the columnar portion 4a, the frictional resistance against the hole wall of the residual soil discharge suppressing body 4 is reduced. Accordingly, a small auger motor having a small rotational torque and a small pushing force can be used as a driving source for the rotating rod 1.

  Furthermore, a through-hole 4c penetrating in the vertical direction is formed at the center of the cylindrical portion 4a and the conical portion 4b of the residual soil discharge suppressing body 4, and the rotating rod 1 penetrates the through-hole 4c so as to be slidable. As a result, the residual soil discharge suppression body 4 freely moves up and down along the rotating rod 1 and freely rotates in the circumferential direction of the rotating rod 1. Further, as shown in FIG. 2 (c), a fitting groove 4 d is formed horizontally in the direction perpendicular to the axis of the rotating rod 1 at the lower end portion of the conical portion 4 b, that is, the peripheral edge portion of the through hole 4 c.

  Then, when the fitting groove 4d is fitted into the uppermost left and right stirring blades 3 attached to the rotating rod 1, the residual soil discharge suppressing body 4 is fixed to the rotating rod 1, and the excavating blade 2 is interposed via the rotating rod 1. It rotates together with the stirring blade 3 and moves up and down along the slide leader 6 together with the excavation blade 2 and the stirring blade 3.

  Reference numeral 10 denotes a co-rotation preventing blade that prevents the “spinning phenomenon of excavated soil” in which the excavated soil rotates together with the excavating blade 2 and the stirring blade 3, and the common rotation preventing blade 10 is located above and below the lowermost stirring blade 3. It is attached to both sides so that it can rotate freely.

  Further, the tip end portion of the upper and lower co-rotation preventing wing 10 is integrally continuous, whereby the upper and lower co-rotation preventing wing 9 is formed in a horizontally long frame shape when viewed from the side.

  In such a configuration, when the rotating rod 1 rotates with an auger motor (not shown) as a drive source, the excavating blade 2 and the stirring blade 3 rotate together with the rotating rod 1, and at the same time the rotating rod 1 together with the auger motor slide reader The ground can be excavated by descending along 6.

  Further, when the fitting groove 4d of the residual soil discharge suppression body 4 is fitted into the upper left and right stirring blades 3 and the residual soil discharge suppression body 4 is fixed to the rotating rod 1, the residual soil discharge suppression body 4 becomes the excavation blade 2 And it rotates together with the stirring blade 3 and is simultaneously pushed down into the drilling hole by descending together with the excavation blade 2 and the stirring blade 3.

  Further, the fitting groove 4d of the residual soil discharge restraining body 4 is removed from the left and right stirring blades 3 of the rotating rod 1 to leave the residual soil discharge restraining body 4 in the middle of the drilling hole (see FIGS. 5 (a) and (b)). The drilling can be continued by pushing only the excavating blade 2 and the stirring blade 3 into the ground while rotating.

  At the same time, when the solidified material is injected into the drilling hole being excavated from the ground via the solidified material injection path 1 a formed at the axis of the rotating rod 1, the solidified material formed at the lower end of the rotating rod 1 Soil cement can be formed by discharging the solidified material into the excavated soil from the discharge port 1b and stirring and mixing with the excavated soil.

  When the rotational torque and pushing force of the auger motor are large, the outer diameter of the residual soil discharge suppressing body 4 can be made larger than the outer diameters of the excavating blade 2 and the stirring blade 3, and conversely, the rotating torque and pushing force of the auger motor. When the force is small, the outer diameter of the residual soil discharge suppressing body 4 is preferably smaller than the outer diameters of the excavation blade 2 and the stirring blade 3.

  Next, a ground improvement method using the ground improvement device of the present invention in such a configuration will be described (see FIGS. 4 to 8). In the drilling hole A shown in the figure, a portion indicated by a dot indicates solidified material mixed soil (soil cement) made of excavated soil and a solidified material, and a non-displayed portion indicates excavated soil.

 (1) First, the axis of the rotating rod 1 is vertically aligned with the pile core of the soil cement pile to be formed, and the excavation blade 2, the stirring blade 3 and the residual soil discharge restraining body 4 are set vertically (FIG. 4 (a )reference).

 (2) Next, an auger motor (not shown) is operated, and the excavating blade 2, the stirring blade 3 and the residual soil discharge suppressing body 4 are pushed into the ground via the rotating rod 1 while rotating. Then, the ground is excavated by the excavating blade 2a of the excavating blade 2, and drilling is started. At the same time, the agitating blade 3 rotates together with the excavating blade 2, whereby the excavated soil excavated by the excavating blade 2 is agitated and discharged to the ground (see FIGS. 4B and 4C).

  By continuing the drilling and agitation in this way, the excavated soil overflows from the drilling hole A until the residual soil discharge suppressing body 4 reaches the hole of the drilling hole A (FIGS. 4 (b) and (c) When the residual soil discharge suppression body 4 is pushed into the drilling hole A and the hole of the drilling hole A is blocked by the residual soil discharge suppression body 4, the excavated soil overflows from the drilling hole A to the ground thereafter. Almost disappears (see FIG. 4 (d)).

  Moreover, when the remaining soil discharge suppression body 4 is pushed into the drilling hole A while rotating, the hole wall of the drilling hole A is consolidated so as to be pushed around. A part of the excavated soil is consolidated into the hole wall. Thus, drilling and stirring are continued to a predetermined depth (approximately 2 m deep from the ground surface).

  In addition, the spiral rib 7 and the spiral blade 8 are respectively formed in the cylindrical portion 4a and the conical portion 4b of the residual soil discharge suppression body 4, so that the residual soil discharge suppression body 4 is relatively rotated while rotating into the drilling hole A. Can be pushed in easily.

 (3) Next, the fitting groove 4 c of the residual soil discharge suppression body 4 is removed from the uppermost stirring blade 3 attached to the rotary rod 1, and the residual soil discharge suppression body 4 is separated from the rotary rod 1.

  Note that the fitting groove 4c of the residual soil discharge suppression body 4 can be easily removed from the stirring blade 3 by temporarily stopping the rotating rod 1 and pushing it strongly into the bore A (FIG. 2 (c)). reference).

  The drilling is resumed by rotating the excavating blade 2 and the stirring blade 3 through the rotating rod 1 while leaving the remaining soil discharge suppressing body 4 in the vicinity of the hole in the drilling hole A (see FIG. 5 (a)). ). At the same time, the solidified material is injected into the drilling hole A from the ground via the injection path 1a of the rotating rod 1. Thus, drilling and agitation are continuously performed to the final design depth while the solidified material is discharged into the drilling hole A (see FIG. 5 (a)).

  Further, when the drilling hole A reaches the final depth, the injection of the solidified material is stopped, and the rotating rod 1, the excavating blade 2 and the agitating blade are rotated while rotating the excavating blade 2 and the agitating blade 3 through the rotating rod 1 and re-stirring. 3 is gradually raised (see FIG. 5 (b)).

  Then, when the rotating rod 1, the excavating blade 2 and the stirring blade 3 descend, the solidified material injected from the ground is drilled from the solidifying material discharge port 1b at the tip of the rotating rod in parallel with the drilling by the excavating blade 2. It is discharged into A and mixed with the excavated soil by the stirring blade 3. In addition, the lower pile B1 of the soil cement pile B is formed at a depth of about 2 m or more from the ground surface by re-stirring when the rotating rod 1, the excavating blade 2 and the stirring blade 3 are raised (FIG. 5). (See (b)).

  Meanwhile, although the excavated soil and the solidified material mixed soil are lifted up to the ground in the drilling hole A by the stirring blade 3, the gap between the hole wall and the rotating rod 1 in the vicinity of the hole of the drilling hole A is blocked by the residual soil discharge suppressing body 4. Due to the erosion, excavated soil and solidified material mixed soil will not overflow to the ground and will not become residual soil. This facilitates the treatment of the solidified material-mixed residual soil, and does not cause the solidified material-mixed residual soil to overflow to the ground and deteriorate the site environment.

  Further, since the spiral rib 7 is formed on the cylindrical portion 4a of the residual soil discharge suppression body 4, a sufficient frictional resistance with the hole wall of the residual soil discharge suppression body 4 is secured, whereby the residual soil discharge suppression body 4 is excavated. It is not pushed out of the drilling hole A by soil or solidified material mixed soil.

  Moreover, the lower pile B1 of the soil cement pile B is consolidated in the drilling hole A, and the surrounding ground is further consolidated through the lower pile B1, so that the ground can be improved to have a high ground strength (Fig. 5 ( b)).

 (5) When the lower pile B1 of the soil cement pile B is thus formed, the excavating blade 2, the stirring blade 3, and the co-rotation preventing blade 10 are once lifted from the drilling hole A to the ground (see FIG. 6 (a)). Then, since the hole wall in the vicinity of the hole of the drilling hole A is consolidated by the residual soil discharge suppression body 4, the excavated soil above the lower pile B1 in the drilling hole A decreases and sinks (FIG. 6 ( see a)). Therefore, the excavated soil overflowing from the hole A at the beginning of the hole drilling may be returned to the hole A and processed (see FIG. 6 (b)).

 (6) Next, the auger motor is re-actuated to leave the residual soil discharge suppression body 4 on the ground, and is pushed again into the hole A while rotating only the excavating blade 2 and the stirring blade 3 through the rotating rod 1 ( (See FIG. 7).

  At the same time, the solidified material is injected into the drilling hole A from the ground via the injection path 1a of the rotating rod 1. Thus, the upper pile B2 is formed on the sol-cement pile B1 by continuously performing drilling and stirring until the lower pile B1 of the soil cement pile B is reached while discharging the solidified material (see FIG. 7).

  In addition, by repeatedly injecting solidified material into a certain depth range (L = 0.5m) from the upper end of the lower pile B1, and repeatedly drilling and stirring for several meters above and below this range, the lower pile B1 and upper pile B2 can be formed integrally (see FIG. 8 (a)).

  By the above construction procedure, a soil cement pile B in which the lower pile B1 and the upper pile B2 are integrally continuous can be constructed (see FIG. 8 (b)).

  In addition, the soil cement pile B is consolidated in the drilling hole A, and the surrounding ground is further consolidated through the soil cement pile B, whereby the ground can be improved to a ground having a high ground strength.

  In the present invention, when the ground excavated soil and solidified material such as cement milk are agitated and mixed to form a soil cement pile in the ground to strengthen the ground, not only the ground is strengthened but also excavated residual soil and solidified material are mixed. The discharge of residual soil can be greatly reduced.

1 Rotating rod
1a Solidification material injection path
1b Solidification material discharge port 2 Drilling blade
2a Drilling blade 3 Stirring blade 4 Residual soil discharge inhibitor
4a Cylindrical part
4b cone
4c through hole
4d Mating groove 5 Heavy construction equipment 6 Slide leader 7 Spiral rib 8 Spiral wing 9 Vertical rib
10 Co-rotating blade

Claims (3)

  A rotating rod, a drilling blade that rotates together with the rotating rod, and a drilling blade that is attached to the upper side of the drilling blade and rotates together with the drilling blade and the rotating rod and solidifies the excavated soil excavated by the drilling blade. Agitating blades that are agitated and mixed with the agitating blade, and are attached to the upper side of the agitating blade and the excavating blade, and prevent the excavated soil and the solidified material from overflowing from the hole, and drilling holes together with the rotating rod, the excavating blade and the agitating blade In the ground improvement device provided with a residual soil discharge suppression body that moves up and down to consolidate the hole wall and the ground around the hole wall, the residual soil discharge suppression body has a maximum diameter approximately equivalent to the drilling hole diameter or slightly larger than the drilling hole diameter An acorn-shaped body or a spindle-shaped body, which has a fitting groove that can be detachably fitted to the stirring blade, and the fitting groove is fitted to the stirring blade, whereby the rotating rod, the stirring blade, and the stirring blade. A ground improvement device configured to move up and down in the drilling hole while rotating together with the blade, and so that the fitting groove is detached from the stirring blade and can be stopped at an arbitrary position in the drilling hole. .   2. The ground improvement device according to claim 1, wherein the rotating rod penetrates the residual soil discharge suppressing body, and the residual soil discharge suppressing body is attached to be slidable in the axial direction of the rotating rod.   It is attached to the upper side of the excavating blade for drilling and the agitating blade located above the excavating blade, and prevents the excavated soil and the solidified material from overflowing from the hole, and together with the excavating blade and the agitating blade, In the residual soil discharge suppression body that moves up and down while rotating and compacts the hole wall and the ground around the hole wall, the residual soil discharge suppression body has an acorn-shaped body whose maximum diameter is approximately equal to the drilling diameter or slightly larger than the drilling diameter or A spindle-shaped body having a fitting groove that can be detachably fitted to the stirring blade, and the fitting groove rotates with the stirring blade and the stirring blade together with the stirring blade. The residual soil discharge restraining body is configured to move up and down while being able to come off from the stirring blade and stop at an arbitrary position in the drilling hole.

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