JPS6342045B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an excavation mixer for excavating the ground and kneading excavated earth and sand and a consolidation liquid.

In the case of a conventional excavating and kneading machine, as shown in FIG.
It was only a 5. Incidentally, the excavated soil 5 excavated by the excavation shaft 7 increases in volume due to the so-called soil bulging phenomenon caused by excavation, and moreover, the consolidation liquid 6 is ejected and kneaded into the excavated hole 2, so that the consolidation liquid 6 , and as a result, the mixed earth and sand 8 is discharged to the ground as shown in FIG. The mixed soil 8 discharged onto the ground must be dumped somewhere else, which requires a large amount of dumping cost and labor. Since the liquid 6 is mixed in, dumping it will cause pollution, and various problems will occur when dumping it. Furthermore, since the mixed soil 8 to be dumped contains a caking liquid 6 such as cement milk, it is wasteful to dump it, and it is not possible to effectively use the caking liquid in an appropriate amount. In addition, in conventional drilling and mixing machines, when mixing and stirring a consolidation liquid such as cement milk with excavated soil, the stirring part does not mix the soil in the excavated hole that has just been excavated by the excavating means. Because the device is used for stirring, the surrounding wall of the excavated hole excavated by the excavation means may collapse and the collapsed soil may be present as a lump in the mixture, or the surrounding wall may collapse and the mixture may be damaged. The composition may be too much excavated soil compared to the consolidation liquid, resulting in uneven strength, or the consolidation liquid may seep into the surrounding wall, resulting in less consolidation liquid in the mixture. As a result, columns formed by mixing the consolidation liquid and excavated earth and sand formed by a conventional excavation mixer, and underground walls made of continuous columns, are not uniformly mixed and have uniform strength. The downside was that I couldn't get anything.

The present invention was invented in view of the above points, and its purpose is to compact the wall of the excavated hole after forming the excavated hole using excavating means such as a bit or a drilling blade. It is also possible to form a hole with a large cross-sectional area, and the excavated soil and consolidation liquid are not discharged to the ground, or even if they are discharged, they are not discharged in large quantities to the ground as in the case of conventional methods. Also, when mixing and stirring a consolidation liquid such as cement milk with excavated soil, the surrounding wall of the excavated hole excavated by the excavation means collapses and the collapsed soil becomes a lump in the mixture. The composition of the mixture is such that there is too much excavated soil compared to the consolidation liquid due to the collapse of the surrounding wall, and the strength becomes uneven. I have never heard of a situation where the liquid soaks in and the amount of caking liquid in the mixture decreases.
It is possible to make the mixing state of columns and underground walls made of continuous columns formed by mixing the consolidation liquid and excavated earth and sand uniform, resulting in uniform strength. The liquid can be used effectively, and while the excavation shaft is rotated to excavate the hole, the area around the hole can be consolidated without rotating the consolidation member, so large rotational force is not required. We are in providing drilling and kneading machines.

The present invention provides an excavating means A at the lower end of the excavating shaft 7, and an excavating means for consolidating the wall around the excavated hole 2 excavated by the excavating means A at a portion of the excavating shaft 7 above the excavating means A. A consolidating member 10 whose maximum outer diameter is larger than the rotation locus drawn by A is rotatably provided,
The excavation means A to the excavation shaft 7 are provided with a spouting part 17 for ejecting the consolidation liquid, and the excavation shaft 7 is provided with a stirring part 15 for mixing and stirring the excavated soil and the consolidation liquid 6. The present invention will be explained in detail below with reference to Examples. A digging means A such as a bit 9 and a digging blade is provided at the lower end of the digging shaft 7. In the embodiment shown in FIG.
An example in which bit 9 is provided is shown. A consolidation member 10 is rotatably mounted on the excavation shaft 7 above the bit 9, which is the excavation means A. Here, the maximum diameter portion of the consolidation member 10 is set to be larger than the rotation locus drawn by the excavating means A such as the bit 9 and the excavating blade. The consolidation member 10 is rotatably attached to the excavation shaft 7, and in the illustrated embodiment, a bearing 11 and the consolidation member 10
The consolidating member 10 is rotatably attached to the excavation shaft 7 by connecting them by a connecting portion 12. In the illustrated embodiment, the consolidation member 10 has a cylindrical shape, and the lower part has a substantially inverted truncated conical shape with the diameter decreasing toward the bottom, the central part has a cylindrical shape, and the upper part has a substantially truncated conical shape. ing. Of course, the shape of the compression member 10 is not limited to that shown in the drawings. Further, the excavation shaft 7 is provided with a stirring section 15 such as a screw section 13 and stirring blades 14 . Further, the excavation shaft 7 or the bit 9 is provided with a spout 17 for discharging a solidifying liquid 6 such as cement milk. However, the excavating and kneading machine configured as described above excavates an excavated hole 2 equal to the rotation locus of the bit 9 using the excavating means such as the bit 9 and the excavating blade while rotating the excavating shaft 7, and then Consolidation member 1
0 descends together with the excavation shaft 7 (the consolidation member 10 does not rotate), thereby consolidating the earth and sand on the wall of the excavation hole 2 in the direction of the arrow shown in FIGS. 2 and 3. Here, the earth and sand on the wall of the excavated hole 2 is consolidated without being excavated, so a space is created around the excavated hole 2, and the excavated hole 2 and the space together have a cross-sectional area larger than that of the excavated hole 2. A large hole 2 is formed. 16 in the figure is the consolidated surrounding ground. Immediately after drilling hole 2 was formed in this way, hole 3 having a larger cross-sectional area than drilling hole 2 was formed, and the excavated earth and sand generated when forming drilling hole 2 were discharged from the discharge hole. The solidifying liquid 6, such as cement milk, is designed to remain almost entirely in the hole 3 without being discharged to the ground (in other words, the excess mixed earth and sand is not discharged to the ground, or even if it is discharged, it is not discharged above the ground). (not discharged to the ground in large quantities),
In this hole 3, the excavated earth and sand and the consolidation liquid 6 are kneaded by the stirring section 15 to form a column (or a wall of one element) as the kneaded earth and sand 8.
It is possible to pull out the excavation shaft 7 and form another column (or wall of one element) in the same manner again, and form an underground wall by continuing the columns (or wall of one element). can. Although the above embodiment shows an example in which there is one excavation shaft 7, two or more excavation shafts 7 may be arranged in parallel. In this case, each excavation shaft 7 has a rotation locus drawn by each shaft 7. Consolidation members 10 each having a larger cross-sectional shape are rotatably provided, and the adjacent consolidation members 10 are vertically shifted from each other, and the ends of the adjacent consolidation members 10 overlap in plan view. FIG. 4 shows an example in which the excavating means A includes a bit 9 and an excavating blade 18 whose rotation locus is larger than that of the bit 9. A drilled hole is formed, and immediately after that drilling wing 1
8, an excavated hole 2 with a larger diameter than this is excavated, and then the peripheral wall is further consolidated with a consolidation member 10 to form a hole 3 with a larger diameter than the excavated hole 2 excavated with the excavating blade 18. It is something that will be done. In this case, the excavating blade 18 serves to form the excavated hole 2 and at the same time knead the excavated soil and the consolidation liquid 6 within the excavated hole 2, and the excavating blade 18 also serves as the stirring section 15. . Of course, it is also possible to use something other than a bit as the excavating means. Also the fifth
The figure shows an example in which a stirring section 15 is provided for kneading the excavated soil and the consolidation liquid 6 in the excavated hole 2 immediately after the excavated hole 2 is excavated with a bit 9 or the like. Fourth
In the embodiment shown in Figs. 5 and 5, the excavated earth and sand and the consolidation liquid 6 are kneaded in the excavated holes 2 and 3. Further, in each of the above embodiments, the excavated soil and the consolidation liquid 6 are kneaded in the hole 3 or in the excavated holes 2 and 3, but the mixing may be performed only in the excavated hole 2. be.

In the present invention, as described above, the excavation means is provided at the lower end of the excavation shaft, and the excavation means for compacting the wall around the excavation hole excavated by the excavation means is provided in the portion of the excavation shaft above the excavation means. A compacted member whose maximum external diameter is larger than the rotational locus drawn by is rotatably provided,
Since the excavation means or the excavation shaft is provided with a spouting part for ejecting the consolidation liquid, and the excavation shaft is also provided with a stirring part for mixing and stirring the excavated earth and sand and the consolidation liquid, the excavation means can continue to form an excavated hole by the excavation means. The walls of the excavation hole can be compacted using a consolidation member to form a hole with a larger cross-sectional area than the excavation hole, and the "bulged" excavated earth and sand generated during excavation of the excavation hole and the consolidation liquid can be removed. It was possible to provide an excavation kneading machine that can completely knead soil and sand in a hole, and does not discharge the mixed soil to the ground, or even if it is discharged, does not discharge it in large quantities as in the past. Therefore, by using the excavating and mixing machine of the present invention, it is not necessary to discharge the mixed soil to the ground and dump it elsewhere, and there is no need for extra dumping work, which reduces costs and improves solidity. Since the caking liquid is not thrown away, there is no pollution, and since only the required amount of caking liquid can be used, the caking liquid can be used effectively, and costs can be reduced in this respect as well. Further, an excavation means, a consolidation member whose maximum external diameter is larger than the rotation locus drawn by the excavation means,
Since it is provided with a spouting part for spouting the consolidation liquid and a stirring part, when the excavation and kneading machine of the present invention is used, the peripheral wall of the excavated hole excavated by the excavation means is compressed by the consolidation member,
In an excavation hole whose surrounding wall is compressed by a consolidation member, the consolidation liquid such as cement milk and the excavated soil are mixed by stirring from the consolidation liquid jetting part, and as a result, the consolidation liquid is When mixing and stirring the consolidating liquid and excavated soil, the surrounding wall may collapse and the collapsed soil may be present as a lump in the mixture, or the surrounding wall may collapse and the composition of the mixture may be different from that of the consolidating liquid. There is no risk that the strength will not be uniform due to too much excavated earth and sand, or conversely, the consolidation liquid will seep into the surrounding wall, reducing the amount of consolidation liquid in the mixture. When mixing the consolidation liquid and the excavated earth and sand, there is no risk that the amount of the consolidation liquid mixed will be too small and the strength of the mixture will not be uniform in this respect as well. As described above, when the excavating and kneading machine of the present invention is used, it is possible to form pillars of uniform strength in the ground, or underground walls in which the pillars are continuous. Furthermore, in the present invention, since the consolidation member is rotatably provided on the excavation shaft, there is no need to rotate the consolidation member when rotating the excavation shaft to excavate the excavation hole. It descends under its own weight and consolidates the wall of the excavation hole.
Therefore, a large rotational force is not required to rotate the excavation shaft.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of the conventional example, FIG. 2 is a vertical cross-sectional view of the present invention, FIG. It is a vertical sectional view of still another embodiment of the same as above, in which 2 is an excavation hole, 6 is a consolidation liquid, 7 is an excavation shaft, 9 is a bit, 10 is a consolidation member, 15 is a stirring part, and 17 is a spouting part. It is.

Claims (1)

[Claims] 1. An excavating means is provided at the lower end of the excavating shaft, and a portion of the excavating shaft above the excavating means has the maximum external diameter than the rotational trajectory drawn by the excavating means for consolidating the wall around the excavated hole drilled by the excavating means. A consolidation member having a large diameter is rotatably provided, a spouting part for spouting a consolidation liquid is provided on the excavation means or the excavation shaft, and a stirring part is provided on the excavation shaft for mixing and stirring the excavated earth and sand and the consolidation liquid. A drilling and mixing machine featuring: