JPS6352177B2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to an excavation, kneading and consolidation wall expanding hole machine that excavates the ground and mixes excavated earth and sand with a consolidation liquid.

[Background technology]

As shown in FIG. 1, a conventional excavating and kneading machine simply has an excavating shaft 1 equipped with an excavating means 2 such as a bit 10 or an excavating blade, and an agitating section 9 such as a screw section 11 or an impeller 12. It was hot. Incidentally, the excavated soil excavated by the excavation shaft 1 increases in volume due to the so-called soil bulging phenomenon caused by excavation, and since the consolidation liquid is jetted into the excavation hole 3 and kneaded, the volume of the consolidation liquid also increases. As a result, the mixed soil 1
3 will be discharged to the ground as shown in Figure 1. The mixed soil 13 discharged onto the ground must be dumped somewhere else, which requires a large amount of dumping cost and labor.
Since it contains a solidifying liquid such as cement milk, dumping it causes pollution, and various problems arise when dumping it. Furthermore, because the mixed soil 13 to be dumped contains a caking liquid such as cement milk, it is wasteful to dump it, and it is not possible to effectively use the caking liquid in the appropriate amount. There was a problem.

[Purpose of the invention]

The present invention was devised in view of the above points, and its object is to press 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. In addition, the consolidation liquid can be effectively used, and while the drilling shaft is rotated to excavate the hole, the surrounding area is consolidated while rotating the consolidation member. It can be consolidated more quickly and reliably than when it is consolidated only by falling under its own weight, and it is also possible to reduce the resistance when rotating the consolidation member, allowing for smooth consolidation and eliminating the need for large rotational force. Our goal is to provide a drilling, kneading and consolidation wall expansion machine that does not require drilling.

[Disclosure of the invention]

The excavation kneading and consolidation wall expanding hole machine of the present invention has a drilling shaft 1
An excavation means 2 is provided at the lower end, and a consolidation member 4 for consolidating the wall around the excavation hole 3 excavated by the excavation means 2 is fixedly provided above the excavation means 2. The excavation shaft 1 is located at the tip of the consolidation part 5 in the rotational direction of the consolidation part 5, where the length of outward protrusion from the center of the excavation shaft 1 is longer than the radius of the rotation locus drawn by the excavation means 2. The rotary guide portion 6 has a short protruding length outward from the center of the rotary guide portion 1,
The rotation locus drawn by the leading edge of the rotation guide part 6 in the rotation direction is made smaller than the rotation locus drawn by the excavation means 2,
The excavation means 2 to the excavation shaft 1 are provided with a spouting part for injecting a consolidation liquid, and the excavation shaft 1 is provided with an agitation part 9 for mixing the excavated earth and sand and the consolidation liquid. With this configuration, the above object of the present invention is achieved.

The present invention will be explained in detail below based on Examples. A plurality of excavation shafts 1 are arranged in parallel, and the plurality of excavation shafts 1
A bit 10 and excavating means 2 such as excavating blades are provided at the lower end of the excavating means 2. Excavation shaft 1 above excavation means 2
A compression member 4 is fixed to the. This consolidation member 4 has a substantially spiral-shaped horizontal section, and includes a consolidation portion 5 whose protrusion length outward from the center of the excavation shaft 1 is longer than the radius of the rotation locus drawn by the excavation means 2; It is constituted by a rotation guide part 6 located continuously from the consolidation part 5 at the tip in the rotation direction and having a shorter protrusion length outward from the center of the excavation shaft 1 than the consolidation part 5.
In the example shown in the figure, the range indicated by A is a circular arc with radius D centered on point O, and the range indicated by B is at point P.
It is a circular arc with radius d centered on point Q, and the range shown by C is a circular arc with radius d' centered on point Q, but it is not necessarily limited to this. A lower guide 14 is provided at the bottom of the consolidation member 4 and is inclined so that the protrusion length outward from the center of the excavation shaft 1 becomes shorter as it goes downward. An upper guide portion 15 is provided which is inclined so that its protrusion length outward from the center of the shaft 1 is shortened. Lower edge of the lower guide 14, upper guide 1
It is preferable that the rotation locus drawn by the longest part of the upper edge of the excavation shaft 1 projecting outwardly from the center of the excavation shaft 1 is approximately equal to the rotation locus drawn by the excavation means 2 or smaller than the rotation locus drawn by the excavation means 2. It is something.
Further, the rotation locus drawn by the leading edge of the rotation guide portion 6 in the rotation direction is smaller than the rotation locus drawn by the excavating means 2. In the figure, reference numeral 16 denotes a connecting portion that connects the consolidation member 4 and the excavation shaft 1 together. Here, the consolidation member 4
rotates together with the excavation shaft 1 via the connecting portion 16. In addition, the adjacent consolidation members 4 are arranged to be shifted in the vertical direction, and the rotational trajectories drawn by the portions of the adjacent consolidation members 4 that have the maximum protruding length outward from the center of the excavation shaft 1 are mutually disposed in plan view. They are starting to partially overlap with each other. The excavation shaft 1 has a stirring section 9
is provided. In the embodiment shown in FIG. 2, the screw part 11 and blades 12 are provided as the stirring part 9, but the consolidation member 4 and the connecting part 16 also serve as a kind of stirring part 9, and as shown in FIG. It is also possible to provide only the consolidation member 4 and the connecting portion 16 without providing the sealing member 11 or the blades 12. In the illustrated embodiment, the maximum protrusion length of the screw portion 11 and blades 12 located above the consolidation member 4 from the center of the excavation shaft 1 is set approximately equal to the maximum protrusion length of the consolidation member 4 from the center of the excavation shaft 1. This allows for efficient stirring within the hole after compaction. The bit 10 and the excavation shaft 1 are provided with a spout for spouting cement milk or other solidifying liquid. Thus, while rotating the plurality of excavation shafts 1 arranged in parallel, the excavation means 2
Due to this, there is a so-called “Kushisashi Dango” shape on the ground 7.
The excavation hole 3 is excavated, and then the consolidation member 4 attached to the excavation shaft 1 rotates and descends, so that the earth and sand on the wall of the excavation hole 3, which is shaped like a dumpling, is not excavated. Consolidation occurs in the direction shown by the arrows in FIGS. 5 and 6. In this case, the lower guide 14,
Since the rotation guide portion 6 is provided, the resistance during rotation of the sealing member 4 can be reduced. Here, the earth and sand on the wall of the excavated hole 3 is consolidated without being excavated, so a space is created around the excavated hole 3, and the excavated hole 3 and the space together have a cross-sectional area larger than that of the excavated hole 3. A large hole 17 is formed. 18 in the figure is the consolidated surrounding ground.
Immediately after the drilled hole 3 is formed in this way, a hole 17 in the shape of a "comb-shaped dumpling" whose cross-sectional area is one size larger than that of the drilled hole 3 shaped like a "comb-shaped dumpling" is formed.
is formed. Therefore, the excavated earth and sand generated when forming the excavated hole 3 and the consolidation liquid spouted from the discharge hole are almost all left in the hole 17 without being discharged to the ground (that is, the excess kneading If the soil is not discharged to the ground or is not discharged to the ground in large quantities as in the past), the excavated soil and the consolidation liquid are kneaded by the stirring section 9 in this hole 17, and the kneaded soil is used to form columns (or 1-element wall). The excavation shaft 1 is pulled out, and another column (or wall of one element) is formed again in the same manner.
An underground wall can be formed by making them continuous. Although the above embodiment shows an example in which a plurality of excavation shafts 1 are arranged in parallel, it is also possible to use only one excavation shaft 1.

〔Effect of the invention〕

As described above, the present invention provides an excavation means at the lower end of the excavation shaft, and a consolidation member for consolidating the wall around the excavation hole excavated by the excavation means at a portion above the excavation means. Since 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, subsequent to the formation of the excavated hole by the excavation means, consolidation is performed. The material can compact the walls of the excavation hole to form a hole with a larger cross-sectional area than the excavation hole, and it is possible to prevent the "bulge" of excavated soil and the consolidation liquid that occurs when excavating the excavation hole. It has been possible to provide an excavation kneading machine that can completely mix the soil in the hole and does not discharge the mixed soil to the ground, or 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. Furthermore, in the present invention, since the consolidation member is fixed to the excavation shaft, when the excavation shaft is rotated to excavate the hole, the consolidation member is moved by the weight of the excavation kneading/consolidation wall expanding machine. The surrounding ground can be easily and quickly consolidated by not only descending and compacting, but also descending and compacting while rotating when descending. Moreover, the consolidation member for consolidating the wall of the excavation hole is located at the consolidation part where the length of the outward protrusion from the center of the excavation shaft is longer than the radius of the rotation locus drawn by the excavation means, and at the tip of the consolidation part in the rotational direction. and a rotation guide part that protrudes outward from the center of the excavation shaft shorter than the consolidation part, so that the rotation trajectory drawn by the leading edge of the rotation guide part in the rotation direction is smaller than the rotation trajectory drawn by the excavation means. As a result, the rotation guide part acts as a guide and the consolidation member rotates and bites smoothly into the wall of the excavation hole, reducing the resistance when rotating the consolidation member and reducing the force required for rotation. It can be small.

[Brief explanation of drawings]

Figure 1 is a sectional view showing the usage state of the conventional example;
The figure is a front view of one embodiment of the present invention, FIG. 3 is a cross-sectional view of the consolidation member part of the same as the above, FIG. 4 is a longitudinal cross-section of the consolidation member part of the same as the above, and FIG. FIG. 6 is a cross-sectional view showing another example of the present invention in use, in which 1 is an excavation shaft, 2 is an excavation means, and 3 is an excavation means. The excavated hole, 4 is a consolidation member, 5 is a consolidation section, 6 is a rotation guide section, and 6 is a stirring section.

Claims (1)

[Claims] 1. An excavation means is provided at the lower end of the excavation shaft, a consolidation member is fixedly provided above the excavation means for consolidating the wall around the excavation hole excavated by the excavation means, and the consolidation member is attached to the excavation shaft. A consolidated part whose protrusion length outward from the center is longer than the radius of the rotation locus drawn by the excavation means, and a part which protrudes outward from the center of the excavation shaft beyond the consolidated part, which is located at the tip of the consolidated part in the rotational direction. It is composed of a rotating guide part with a short length, and the rotational trajectory drawn by the leading edge of the rotating guide part in the rotational direction is smaller than the rotational trajectory drawn by the excavation means, and the jet for jetting the consolidation liquid is made to be formed on the excavation means or the excavation shaft. What is claimed is: 1. An excavation/mixing/consolidation wall-expanding hole machine, characterized in that the drilling shaft is provided with a stirring section for mixing excavated earth and sand and a consolidation liquid.