JP2006336427A - Ground agitator and diaphragm wall construction method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To construct a diaphragm wall by this hole, by excavating the hole continuing in a series without generating a constriction. <P>SOLUTION: This ground agitator has a Reuleaux rotary shaft 111 having a cross-sectional shape of a triangular shape of Reuleaux, a bearing 112 for rotatably supporting a Reuleaux triangular shape part in an internal shape of a square shape with an outside width of the Reuleaux triangular part as one side, a driving mechanism having a driving part for rotatingly driving the Reukeaux rotary shaft and movably arranged in the shaft direction of the Reuleaux rotary shaft, a delivery mechanism for delivering a sediment solidifying material from the tip side of the Reuleaux rotary shaft extended to a tip surface of the bearing, an excavation cutter 2 arranged on the tip of the Reuleaux rotary shaft and formed in a range of the Reuleaux triangular shape of making the direction of the center of gravity and the apex coincide with the Reuleaux triangular shape of the Reuleaux rotary shaft by expanding the Reuleaux triangular shape of the Reuleaux rotary shaft, and an agitating blade 3 arranged between the bearing of the Reuleaux rotary shaft and the excavation cutter and similarly formed to the excavation cutter. As a result, a substantially rectangular hole H can be excavated. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a ground stirrer that excavates a hole in the ground, discharges and solidifies a sediment solidified material into the hole, and a ground continuous wall building method for building a continuous wall using the ground stirrer. .

  Conventionally, when building an underground continuous wall, a hole with a circular cross-section is excavated, and the earth and sand excavated in the hole and cement milk are stirred and mixed to solidify the mixture, so that the underground continuous wall is formed. Built. As a ground stirrer that stirs the inside of the excavated hole, there is one in which a plurality of augers are arranged in parallel so that the rotation regions partially overlap and the solidified liquid is discharged from the tip of the auger. In this ground agitator, three connected holes are excavated and the earth and sand in the holes and the discharged solidified liquid are stirred and mixed. Further, the excavation and agitation of the holes are performed again by the ground agitator so as to be connected to the holes at one end of the three connected holes. In this way, the underground continuous wall is built (see, for example, Patent Document 1).

JP 2001-241063 A JP-A-11-267950

  However, conventionally, since a part of the circular cross-section is overlapped, the overlapping portions are connected in a state where the overlapping occurs. For this reason, when a mixture solidified and it became the underground continuous wall, the part which was tied was weak (or it was not connected), and there existed a problem that water leakage might arise and water stoppage was not enough. In addition, when the core material is built in the underground continuous wall, there is a problem that it is inevitably limited to be built in the center of the hole having a circular cross section.

  In addition, as a square-shaped drilling device, there is an apparatus that provides a cutting tool on a roulau triangle rotating body that is a triangle of rouleau and rotates the roulau triangle rotating body to make a square hole in a workpiece. (For example, refer to Patent Document 2).

  However, it is difficult to apply the above-described square drilling apparatus as a ground agitator. That is, the square drilling device supports a roulau triangular rotating body rotatably with a fixed plate having a square hole as a guide, and drills with a cutting tool provided on the roulau triangular rotating body. Yes. In this case, since the square hole drilled in the workpiece is a hole having the same size as the square hole provided in the fixed plate, the ground agitator is a device larger than the cross-sectional shape of the drilled hole. Is not applicable because it is necessary.

  In view of the above circumstances, the present invention builds a ground stirrer capable of excavating a series of holes without causing constriction and stirring, and a continuous underground wall connected in series without causing constriction. The purpose is to provide an underground continuous wall construction method.

  In order to achieve the above object, a ground agitator according to claim 1 of the present invention includes a rouleau rotary shaft having a triangular cross-sectional shape of rouleaux, and an outer width of the rouleau triangular portion of the rouleau rotary shaft as one side. The bearing has a square inner shape and rotatably supports the triangular portion of the roulau, and a drive unit that rotationally drives the roulau rotation shaft, and is provided so as to be movable in the axial direction of the roulau rotation shaft. A drive mechanism, a discharge mechanism for discharging the sediment solidification material from the tip end side of the roulau rotation shaft extending to the tip end surface of the bearing, and a luro of the roulau rotation shaft provided at the tip of the roulau rotation shaft. At least the vertex from the center of gravity within the triangular shape of the roulau in which the cross section of the triangular shape is enlarged and the orientation of the center of gravity and the apex coincides with the triangular shape of the rouleau rotation axis. A drilling cutter formed along an extended line extending from the bearing, the bearing of the roulau rotation shaft, and the excavation cutter, and expanding the triangular cross section of the roulau rotation shaft of the roulau rotation shaft. And a stirring blade formed at least along an extended line from the center of gravity to the apex within the range of the triangular shape of the roulau in which the directions of the center of gravity and the apex coincide with the triangular shape of the roulau.

  The ground agitator according to claim 2 of the present invention is the ground agitator according to claim 1, wherein a plurality of the roulau rotation shafts are provided in parallel, and the rotation trajectories of the adjacent mutual excavation cutters and the adjacent mutual stirring blades are viewed from the tip. The ground agitator according to claim 1, wherein the positions of the mutually adjacent excavation cutters and the adjacent agitator blades are shifted in the axial direction of the roulau rotation shaft in an overlapping manner.

  The ground agitator according to claim 3 of the present invention is the ground agitator according to claim 1, wherein a plurality of the roulau rotation shafts are provided in parallel, and the rotation trajectories of the adjacent mutual excavation cutters and the adjacent mutual stirring blades are viewed from the tip. The positions of the adjacent excavation cutters and the adjacent agitator blades are arranged side by side in the axial direction of the roulau rotation shaft in an overlapping manner, and the adjacent roulau rotation shafts are rotationally driven in opposite directions. The ground agitator according to claim 1.

  A ground stirrer according to a fourth aspect of the present invention is characterized in that, in the third aspect, the phases of the rotational positions of the adjacent mutual excavation cutters and the adjacent mutual stirring blades are made different.

  An underground continuous wall construction method according to claim 5 of the present invention is an underground continuous wall construction method using the ground stirrer according to any one of claims 1 to 4, wherein rotation of the roulau rotation shaft is performed. Along with the drilling cutter, the step of drilling the hole with the drilling cutter, the step of stirring the sediment in the hole and the discharged sediment solidification material with the stirring blade as the roulau rotating shaft rotates, And a step of inserting a core material into the hole before the soil is solidified.

  Since the ground stirrer according to the present invention can excavate a hole having a substantially rectangular cross section with respect to the ground, each hole can be connected without connecting the holes having a circular section by connecting the holes. Can be connected in a series. When this hole is used as a continuous wall in the ground, water leakage does not occur and the water-stopping property is sufficiently maintained. Further, when the core material is built in the hole, the core material can be arranged freely because it can be built not only in a single hole but also in an overlapping portion between the connected holes.

  Also, a plurality of roulau rotation shafts are provided in parallel, and the adjacent mutual excavation cutters and the adjacent mutual agitation blades are adjacent to each other in such a manner that the rotation trajectories of the adjacent mutual excavation cutters and the adjacent mutual agitation blades are viewed from the tip. The respective positions are shifted in the axial direction of the roulau rotation axis. Alternatively, a plurality of roulau rotation shafts are provided in parallel, and adjacent mutual excavation cutters and adjacent mutual agitation blades are adjacent to each other in such a manner that the rotation trajectories of the adjacent mutual excavation cutters and adjacent mutual agitation blades overlap when viewed from the tip. While arranging the respective positions side by side in the axial direction of the roulau rotation shaft, the adjacent roulau rotation shafts are rotationally driven in the opposite directions. As a result, a continuous hole having a substantially rectangular (substantially rectangular) cross section can be easily excavated with respect to the ground.

  The underground continuous wall construction method according to the present invention can easily obtain an underground continuous wall formed by excavating a hole having a substantially rectangular cross section with respect to the ground and continuously connected in a substantially rectangular shape.

  Exemplary embodiments of a ground agitator according to the present invention will be described below in detail with reference to the accompanying drawings. Note that the present invention is not limited to the embodiments.

  FIG. 1 is a cross-sectional side view showing an embodiment of a ground agitator according to the present invention, and FIG. 2 is a conceptual view of the ground agitator shown in FIG. 1 viewed from the axial direction.

  As shown in FIG. 1, the ground agitator includes a drive mechanism 1, a drilling cutter 2, a stirring blade 3, and a discharge mechanism 4. The drive mechanism 1 is driven while supporting the excavation cutter 2 and the stirring blade 3, and includes a bearing portion 11 and a drive portion 12.

  The bearing unit 11 supports the excavation cutter 2 and the stirring blade 3 and has a roulau rotary shaft 111 and a bearing 112.

  The rouleau rotation shaft 111 is formed in a longitudinal shape in its own axial direction, and a cross-sectional shape perpendicular to the axis is formed in a rouleau triangle as shown in FIG. The Reuleaux triangle shape has a shape formed by drawing an arc connecting the other vertexes with each vertex of the regular triangle as the center, and the outer width (passing width) is constant. The roulau rotating shaft 111 has a distal end extending toward the distal end side of the bearing portion 11 and a proximal end extending inside the bearing portion 11.

  The bearing 112 is fixed to the bearing portion 11 and rotatably supports the triangular portion of the rouleau rotary shaft 111. As shown in FIG. It has a square inner shape with the outer width as one side. A plurality (two in the present embodiment) of the bearings 112 are provided along the longitudinal direction of the rouleau rotation shaft 111, and the rouleau rotation shaft 111 can be stably supported without shaking. Further, the bearing 112 is not limited to a plurality, and even if the bearing 112 has an inner shape that is long in the longitudinal direction of the roulau rotation shaft 111, it is possible to stably support the triangular portion of the roulau rotation shaft 111 without shaking. is there.

  In addition, the rouleau rotating shaft 111 should just be the triangular shape of rouleau in the cross-sectional shape of only the site | part supported by the bearing 112. FIG. Further, although not clearly shown in the drawing, it is preferable to arrange a member for reducing friction at a portion where the triangular portion of the roulau rotating shaft 111 and the bearing 112 are in contact with each other.

  The drive unit 12 is for rotationally driving the roulau rotary shaft 111 supported by the bearing 112, and includes a universal joint 121, a main rotary shaft 122, and a drive source 123. The universal joint 121 is used when two shafts are connected with an angle, and even if the relative position or angle between the two shafts changes, the transmission of the driving force between the shafts is affected. It does not occur. One end of the universal joint 121 is connected to the base end of the rouleau rotary shaft 111. The main rotating shaft 122 is formed in a columnar shape, and is rotatably supported via a bearing 122 a fixed to the bearing portion 11 and a bearing 122 b provided outside the bearing portion 11. The other end of the universal joint 121 is connected to the tip of the main rotating shaft 122. The main rotating shaft 122 is provided with a screw 122c. The driving source 123 includes a driving unit (not shown) such as a motor, and a transmission unit including a reduction gear, a belt, a chain, and the like. To communicate. That is, the driving unit 12 transmits the driving force of the driving source 123 to the roulau rotating shaft 111 via the main rotating shaft 122 and the universal joint 121.

  The drive mechanism 1 described above is supported by a post (not shown) provided in parallel to the rouleau rotary shaft 111 and the main rotary shaft 122, and extends in the axial direction of the rouleau rotary shaft 111 and the main rotary shaft 122 along the post. It is provided to be movable.

  The excavation cutter 2 is provided at the distal end of the roulau rotary shaft 111 extending to the distal end side of the bearing portion 11. As shown in FIG. 2, the excavation cutter 2 expands the triangular cross-section of the rouleau rotation shaft 111 at an equal ratio so that the center of gravity G and the apex T are oriented with respect to the rouleau triangle shape of the rouleau rotation shaft 111. It is within the range of the matched Rouleau triangle, and is provided along an extended line extending from the center G of the enlarged Rouleau triangle to the apex T at least. Specifically, the excavation cutter 2 includes three radial excavation blades 21 extending along an extension line extending from the triangular center of gravity G of the expanded roulau to the apex T. The angle θ of the tip of the excavating blade 21 is about 120 ° centered on the extended line from the triangular center of gravity G of the expanded roulau to the apex T, and the excavating cutter 2 is placed within the expanded triangular range of the roulau. It is preferable because it fits. A drill bit 22 is provided on the front surface of the drill blade 21 at an extended line from the center of gravity G to the apex T. The excavating blades 21 do not need to be in the above three, and may be at least one. When a plurality of excavation blades 21 are provided, a connecting material (not shown) for connecting the excavation blades 21 may be provided. By providing the connecting material, the strength of the excavating blade 21 can be improved.

  The stirring blade 3 is provided between the bearing portion 11 and the excavation cutter 2 on the distal end side of the roulau rotating shaft 111 extending to the distal end side of the bearing portion 11. As shown in FIG. 2, the agitating blade 3 enlarges the triangular section of the rouleau rotation shaft 111 at an equal ratio so that the center of gravity G and the apex T are oriented with respect to the rouleau triangle shape of the rouleau rotation shaft 111. It is within the range of the matched Rouleau triangle, and is provided along an extended line extending from the center G of the enlarged Rouleau triangle to the apex T at least. The agitating blade 3 in the present embodiment extends along an extension line extending from the triangular center of gravity G of the expanded roulau to the apex T so as to overlap the excavating blade 21 of the excavating cutter 2 as viewed from the tip. It consists of three existing radial wings. The angle θ of the tip of the stirring blade 3 is about 120 ° centered on the extended line from the center of gravity G of the expanded rouleau to the apex T, and the stirring blade 3 is within the expanded triangular range of the roulau. It is preferable because it fits. Note that the number of the stirring blades 3 is not necessarily the above three, and at least one stirring blade may be used. When a plurality of stirring blades 3 are provided, a connecting material (not shown) for connecting the stirring blades 3 may be provided. By providing the connecting material, it is possible to improve the strength of the stirring blade 3. Further, as shown in FIG. 1, a plurality of stirring blades 3 (two in FIG. 1) are arranged in the axial direction of the roulau rotating shaft 111. Not only this but only one stirring blade 3 may be arranged.

  The discharge mechanism 4 is for discharging a soil-solidifying material such as cement from the tip side of the roulau rotating shaft 111. As shown in FIG. 1, the discharge mechanism 4 includes a discharge pipe 41 that is internally provided along the main rotary shaft 122 and the rouleau rotary shaft 111. The discharge pipe 41 communicates with the main rotary shaft 122 and the roulau rotary shaft 111 through the flexible pipe 42 at the universal joint 121. Although not clearly shown in the drawing, the discharge mechanism 4 includes a sending means for sending the soil solidification material from the base end side of the main rotary shaft 122 to the tip side of the roulau rotary shaft 111 via the discharge pipe 41 and the flexible pipe 42. Have. That is, the sediment solidifying material is discharged from the tip end side of the rouleau rotary shaft 111 by the delivery means.

  The ground agitator having the above configuration transmits the driving force of the drive unit 12 to the roulau rotation shaft 111, so that the roulau triangle shape of the roulau rotation shaft 111 performs a rotary motion according to the square inner shape of the bearing 112. For this reason, the excavation cutter 2 provided on the roulau rotating shaft 111 has a substantially rectangular trajectory with its apex T based on the square shape as the roulette of the roulau rotating shaft 111 rotates in a triangular shape. Then, the drive mechanism 1 is moved in the axial direction of the roulau rotating shaft 111 (toward the ground). As a result, it becomes possible to excavate the hole H having a substantially rectangular cross section with respect to the ground.

  Further, when the triangular shape of the rouleau rotary shaft 111 rotates in accordance with the square inner shape of the bearing 112, the stirring blade 3 provided on the rouleau rotary shaft 111 causes the rouleau trigonal axis of the rouleau rotary shaft 111 to rotate. As the shape rotates, the vertex T forms a substantially rectangular locus based on a square shape. As a result, it becomes possible to perform stirring in a substantially rectangular shape according to the cross-sectional shape of the hole H.

  Here, the excavation cutter 2 and the agitating blade 3 enlarge the triangular cross section of the rouleau rotation shaft 111 at an equal ratio, and the orientation of the center of gravity G and the apex T with respect to the rouleau triangle shape of the rouleau rotation shaft 111. Are provided along an extended line extending from the center of gravity G of the expanded Rouleau triangle to the apex T. For this reason, since the cross-sectional shape of the excavated hole H is larger than the inner shape of the bearing 112 that supports the roulau rotary shaft 111, the hole drawn by the excavating cutter 2 and the stirring blade 3 rotated with the rotation of the roulau rotary shaft 111. It is possible to form a contour viewed from the front end side of the bearing portion 11 within the range of the cross-sectional shape of H. As a result, since the bearing portion 11 can pass through the hole H excavated by the excavation cutter 2 and the agitating blade 3, the ground agitator for excavating the hole H having a substantially square (substantially rectangular) excavation cross section is obtained. Is possible.

  When the underground continuous wall is constructed using this ground stirrer, the sand and sand solidification material is discharged from the tip side of the roulau rotary shaft 111 while excavating the hole H, so that the earth and sand inside the hole H is discharged by the stirring blade 3. And the soil cement mixed with the soil solidifying material is stirred. In addition, you may discharge the earth and sand solidification material, excavating the hole H and extracting a ground stirrer from the said hole H.

  Next, as shown in FIG. 3, a new hole H is excavated in the same manner as described above so as to be partially overlapped with the hole H excavated.

  Thereafter, before the stirred soil cement is solidified, a core material 5 such as an H-shaped steel or a reinforcing bar is inserted into the hole H as shown in FIG. And the underground continuous wall which built the core material is built by solidifying the soil cement.

  In addition, although the core material 5 is normally built in the single hole H, since it is the hole H of the excavation cross section of substantially square shape (substantially rectangular shape) as mentioned above, each connected as shown in FIG. It is possible to build in the overlapping portion between the holes H.

  As described above, according to the above-described ground agitator, the hole H having a substantially rectangular cross section can be excavated with respect to the ground. Therefore, by connecting the hole H, the hole having a circular cross section is connected. It is possible to connect the holes H in a series without the occurrence of. As a result, water leakage does not occur when the underground continuous wall is used, and the water stoppage is sufficiently maintained. Further, when the core material 5 is built, the core material 5 can be arranged freely because it can be built not only in the single hole H but also in the overlapping portion between the connected holes H. Since the ground agitator excavates the hole H having a substantially rectangular cross section with a simple mechanism as described above, the failure is unlikely to occur, the reliability is high, and the cost does not increase.

  Moreover, according to the underground continuous wall construction method using the ground stirrer described above, it is possible to obtain a substantially rectangular cross-section hole H without constriction, and to obtain a continuous continuous underground wall. is there.

  In the excavation cutter 2 and the stirring blade 3 shown in FIG. 2, the triangular cross section of the roulau of the roulau rotating shaft 111 is enlarged at an equal ratio, and the enlargement ratio is doubled. When the enlargement ratio of the excavation cutter 2 and the stirring blade 3 is twice or more, the cross-sectional shape of the hole H is far from a square shape (rectangular shape) and is rounded. On the other hand, when the enlargement ratio of the excavation cutter 2 and the stirring blade 3 is 2 times or less, the cross-sectional shape of the hole H is closer to a square shape (rectangular shape), but the roulette rotation occupies the cross-sectional shape of the hole H. The shaft 111 becomes thicker. For this reason, when excavating the hole H having a substantially square (substantially rectangular) cross-sectional shape, it is preferable to apply the excavation cutter 2 and the stirring blade 3 having an enlargement ratio of about twice.

  By the way, in the ground stirrer having the above-described configuration, a plurality of roulau rotating shafts 111 are provided in parallel, and the adjacent excavation cutters 2 are adjacent to each other in a manner in which the rotation trajectories of the adjacent excavation cutters 2 and the agitating blades 3 overlap each other when viewed from the tip. The positions of the agitating blades 3 are shifted in the axial direction of the roulau rotation shaft 111. If comprised in this way, it becomes possible to excavate the hole H of the substantially rectangular (substantially rectangular) cross section which continued the substantially square (substantially rectangular) cross section in series, and to stir the inside of the said hole H Become.

  Further, in the case where a plurality of the roulau rotation shafts 111 are provided in parallel and the rotation trajectories of the adjacent mutual excavation cutters 2 and the adjacent mutual stirring blades 3 are overlapped when viewed from the tip, the following configuration can be made. 4 is a schematic view showing a ground agitator when a plurality of roulau rotation shafts are provided in parallel, FIG. 5 is a schematic view of the ground agitator shown in FIG. 4 viewed from the axial direction, and FIG. 6 is an axial view of the ground agitator shown in FIG. It is the schematic of another form seen from. In addition, the same code | symbol is attached | subjected to the structure similar to the ground excavator mentioned above in FIGS. 4-6, and description is abbreviate | omitted.

  Specifically, as shown in FIG. 4, a plurality of roulau rotation shafts 111 are provided in parallel, and are formed radially extending along an extension line extending from the triangular gravity center G of the roulau to the apex T as described above. In the case where the excavation cutter 2 and the agitating blade 3 composed of the three excavating blades 21 are used, the adjacent excavation cutters 2 and the adjoining agitating blades 3 overlap each other as viewed from the tip. While the excavation cutter 2 and each of the adjacent stirring blades 3 are arranged on the same plane in the axial direction of the roulau rotation shaft 111, the adjacent roulau rotation shaft 111 is rotationally driven in the opposite direction. In this case, as shown in FIG. 5, in the embodiment in which a plurality of excavation cutters 2 and stirring blades 3 shown in FIG. 2 are provided in the lateral direction, the excavation blades 21 and the stirring blades 3 overlap each other. The rotation positions of the excavation cutters 2 adjacent to each other and the agitating blades 3 adjacent to each other may be made different from each other. Further, as shown in FIG. 6, in the embodiment in which a plurality of the excavation cutters 2 and the stirring blades 3 shown in FIG. 2 are provided in the longitudinal direction, the mutual excavation blades 21 and the stirring blades 3 do not overlap with each other. It is not necessary to make the phases of the rotational positions of the adjacent excavation cutters 2 and the adjacent stirring blades 3 different from each other. The distance L (interval of the mutual center of gravity G) between each adjacent excavation cutter 2 and each adjacent agitation blade 3 is 1.3-1... Of the length of the excavation blade 21 and the agitation blade 3 from the center of gravity G to the apex T. About 5 times is preferable.

  That is, as shown in FIG. 5 and FIG. 6, it is possible to excavate a hole H having a substantially rectangular (substantially rectangular) cross section in which a plurality of holes H having a substantially square (substantially rectangular) cross section are continuously connected. become. In addition, by arranging the tip of each excavation cutter 2 on the same plane, the tip of the excavated hole H can be excavated flat without unevenness.

  The ground agitator shown in FIGS. 4 to 6 transmits the driving force of the drive unit 12 to the rouleau rotation shaft 111 so that the rouleau triangle shape of the rouleau rotation shaft 111 rotates in accordance with the square inner shape of the bearing 112. Do exercise. For this reason, the excavation cutter 2 provided on the roulau rotating shaft 111 has a substantially rectangular trajectory with its apex T based on the square shape as the roulette of the roulau rotating shaft 111 rotates in a triangular shape. Then, the drive mechanism 1 is moved in the axial direction of the roulau rotating shaft 111 (toward the ground). As a result, it becomes possible to excavate a hole H having a substantially rectangular (substantially rectangular) cross-section in which a plurality of holes H having a cross-section based on a square shape are continuously connected to the ground.

  Further, when the triangular shape of the rouleau rotary shaft 111 rotates in accordance with the square inner shape of the bearing 112, the stirring blade 3 provided on the rouleau rotary shaft 111 causes the rouleau trigonal axis of the rouleau rotary shaft 111 to rotate. As the shape rotates, the vertex T forms a substantially rectangular locus based on a square shape. As a result, it becomes possible to perform stirring in a substantially rectangular shape (substantially rectangular shape) according to the cross-sectional shape of the hole H.

  Here, the excavation cutter 2 and the agitating blade 3 enlarge the triangular cross section of the rouleau rotation shaft 111 at an equal ratio, and the orientation of the center of gravity G and the apex T with respect to the rouleau triangle shape of the rouleau rotation shaft 111. Are provided along an extended line extending from the center of gravity G of the expanded Rouleau triangle to the apex T. For this reason, since the cross-sectional shape of the excavated hole H is larger than the inner shape of the bearing 112 that supports the roulau rotary shaft 111, the hole drawn by the excavating cutter 2 and the stirring blade 3 rotated with the rotation of the roulau rotary shaft 111. It is possible to form a contour viewed from the front end side of the bearing portion 11 within the range of the cross-sectional shape of H. As a result, since the bearing portion 11 can pass through the hole H excavated by the excavation cutter 2 and the stirring blade 3, the ground agitator for excavating the hole H having a substantially rectangular (substantially rectangular) excavation cross section is obtained. Is possible.

  When the underground continuous wall is constructed using the ground agitator shown in FIGS. 4 to 6, the agitation blade 3 is discharged by discharging the sediment solidification material from the tip side of the roulau rotation shaft 111 while excavating the hole H. Thus, the soil cement mixed with the earth and sand inside the hole H and the earth and sand solidifying material is agitated. In addition, you may discharge the earth and sand solidification material, excavating the hole H and extracting a ground stirrer from the said hole H.

  Next, as shown in FIG. 3, a new hole H is excavated in the same manner as described above so as to be partially overlapped with the hole H excavated. At this time, for example, the holes H are excavated first on both sides of the hole H, and the holes H are excavated between the holes H so as to be connected to the holes H excavated earlier. In this case, as shown in FIG. 7, the single holes H at both ends of the holes H (shown by the one-dot chain line in FIG. 7) to be excavated later, as opposed to the single holes at the opposite ends of the holes H excavated earlier. It is good to excavate the continuous hole H so as to overlap.

  Thereafter, before the stirred soil cement is solidified, a core material 5 such as an H-shaped steel or a reinforcing bar is inserted into the hole H as shown in FIG. And when soil cement solidifies, the underground continuous wall which built the core material 5 will be built.

  In addition, although the core material 5 is normally built in the single hole H, since it is the hole H of the excavation cross section of substantially square shape (substantially rectangular shape) as mentioned above, each connected as shown in FIG. It is possible to build in the overlapping portion between the holes H.

  As described above, according to the ground agitator shown in FIGS. 4 to 6, the hole H that is continuous in a substantially rectangular (substantially rectangular) cross section with respect to the ground can be easily excavated. The continuous holes H are connected in series without constriction as compared with the case of connecting holes having a circular cross section. As a result, water leakage does not occur when the underground continuous wall is used, and the water stoppage is sufficiently maintained. Further, when the core material 5 is built, the core material 5 can be arranged freely because it can be built not only in the single hole H but also in the overlapping portion between the connected holes H. Since the ground agitator excavates the hole H having a substantially rectangular cross section with a simple mechanism as described above, the failure is unlikely to occur, the reliability is high, and the cost does not increase.

  Moreover, according to the underground continuous wall construction method using the ground stirrer described above, a hole H having a substantially rectangular (substantially rectangular) cross section is obtained without being constricted with respect to the ground, and the underground is connected in series. It is possible to easily obtain a continuous wall.

  In the above-described embodiment, an example in which three excavating blades 21 and three stirring blades 3 are provided has been described. However, the triangular cross-section of the roulau rotation shaft 111 is enlarged at an equal ratio, and the roulau rotation shaft 111 is expanded. If the direction of the center of gravity G and the apex T is matched with the triangular shape of the rouleau within the range of the rouleau triangular shape, in addition to the excavating blade 21 and the agitating blade 3, an excavating blade and an agitating blade are provided. Also good. Moreover, it is good also as a triangular-shaped excavation cutter and stirring blade of the expanded roulau. In such a case, since the excavation area in each excavation blade and the agitation area in each agitation blade are reduced, the driving force of the drive source 123 can be reduced. 5 and FIG. 6, it is assumed that excavation blades are added within a range where there is no interference between adjacent excavation cutters 2.

1 is a sectional side view showing an embodiment of a ground excavator according to the present invention. It is the schematic which looked at the ground stirrer shown in FIG. 1 from the axial direction. It is a conceptual diagram of the continuous underground wall built with the ground stirrer shown in FIG. It is the schematic which shows the ground stirrer in the case of providing a plurality of roulau rotation axes in parallel. It is the schematic which looked at the ground stirrer shown in FIG. 4 from the axial direction. It is the schematic of another form which looked at the ground stirrer shown in FIG. 4 from the axial direction. It is a conceptual diagram of the continuous underground wall built with the ground stirrer shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Drive mechanism 11 Bearing part 111 Ruuro rotary shaft 112 Bearing 12 Drive part 121 Universal joint 122 Main rotary shaft 122a Bearing 122b Bearing 122c Screw 123 Drive source 2 Excavation cutter 21 Excavation blade 22 Excavation bit 3 Stirring blade 4 Discharge mechanism 41 Discharge pipe 42 Flexible pipe 5 Core G Center of gravity H Hole L Interval T Vertex

Claims (5)

A rouleau rotation shaft having a triangular cross-sectional shape of the rouleaux, and an inner shape of a square shape with an outer width of the rouleau triangle portion of the rouleau rotation axis as one side, and rotatably supporting the rouleau triangle portion. A drive mechanism that has a bearing and a drive unit that rotationally drives the roulau rotation shaft, and is movable in the axial direction of the roulau rotation shaft;
A discharge mechanism that discharges the sediment solidification material from the tip side of the roulau rotary shaft extending to the tip surface of the bearing;
A rouleau triangle provided at the tip of the rouleau rotation shaft, in which the triangular cross section of the rouleau rotation shaft of the roulau rotation shaft is enlarged so that the direction of the center of gravity and the apex coincide with the rouleau triangle shape of the roulau rotation shaft. A drilling cutter formed along an extension line extending from the center of gravity to the apex at least within the range of the shape;
It is provided between the bearing of the roulau rotary shaft and the excavation cutter, and expands the triangular cross section of the roulau of the roulau rotary shaft so that the center of gravity and the apex of the roulau triangular shape of the roulau rotary shaft are increased. A ground agitator comprising: a stirring blade formed at least along an extension line extending from the center of gravity to the apex within a triangular shape of the roulaus whose directions are matched.   A plurality of the roulau rotating shafts are provided in parallel, and the adjacent mutual excavation cutters and the adjacent mutual agitation blades are adjacent to each other in such a manner that the rotation trajectories of the adjacent mutual excavation cutters and the adjacent mutual agitation blades overlap each other when viewed from the tip. The ground agitator according to claim 1, wherein the position is shifted in the axial direction of the roulau rotation shaft.   A plurality of the roulau rotating shafts are provided in parallel, and the adjacent mutual excavation cutters and the adjacent mutual agitation blades are adjacent to each other in such a manner that the rotation trajectories of the adjacent mutual excavation cutters and the adjacent mutual agitation blades overlap each other when viewed from the tip. The ground agitator according to claim 1, wherein each adjacent roulau rotation shaft is rotationally driven in the reverse direction while arranging the positions in the axial direction of the roulau rotation shaft.   The ground stirrer according to claim 3, wherein phases of rotation positions of adjacent excavation cutters and adjacent agitation blades are made different from each other. An underground continuous wall construction method using the ground agitator according to any one of claims 1 to 4,
A step of drilling a hole with a drilling cutter in accordance with rotation of the roulau rotation shaft;
Agitating the earth and sand in the hole and the discharged earth and sand solidifying material with a stirring blade as the Rouleau rotation shaft rotates;
A step of similarly excavating and agitating a hole in a form connected to the previously excavated hole; and
And a step of inserting a core material into the hole before the earth and sand is solidified.

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