JPH0461129B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method for constructing a multi-axis soil cement column array in the case where the soil cement column array is constructed underground to serve as a retaining wall.

BACKGROUND OF THE INVENTION Multi-axis soil auger machines have recently been used to increase efficiency in constructing soil-cement column retaining walls. A commonly used 4-shaft soil auger machine 1 (see Fig. 10) is equipped with a connecting bearing 4 that supports four auger rods 2 at equal intervals near the stirring blade 3 at the bottom of the auger rod 2, and performs drilling in the same straight line. After drilling is completed, cement milk is injected, the auger rod 2 is stirred by the stirring blades 3, and the core material is inserted into soil cement, which does not harden. There is a preceding unit process in which each unit is repeated one unit at a time, followed by a subsequent unit process in which holes are drilled between the preceding units and a core material is inserted into the soil cement. In this case, the core material is inserted on the ground by fixing a core material insertion guide along the hole row and inserting the core material one by one so that it is in the center of the hole, but there is a guide etc. at the tip. Instead, it was inserted in a free state, hanging down due to gravity.

Problems to be Solved by the Invention In the above-mentioned conventional method of constructing soil cement columns, in order to eliminate the lack of overlap between each unit, holes 5 at the end of the preceding unit are
A complete lap method is also used in which the hole 6 at the end of the succeeding unit is completely overlapped with the hole 6 at the end of the succeeding unit, but in this case, the soil cement of the leading unit hardens and develops strength, especially the soil quality around the soil cement column. If the strength of the hole is low, the auger rod 2 of the trailing unit will deviate from the hard column part and escape toward the soft surrounding soil, which may significantly reduce the accuracy of drilling and cause insufficient lap. Furthermore, even when a complete lap is not performed, when the trailing unit drills a hole between the leading unit, the auger rod 2 may excavate unbalancedly if it hits hard rock, etc., and even if this is not the case, the tip of the auger rod 2 is attached to the connecting bearing 4. Although the auger rods 2 are spaced at regular intervals, they may be offset because there is no guide to accurately overlap and drill holes between the leading and trailing units. In all of these cases, there was a problem in that the wall thickness of the lap portion became thinner and water-stopping properties were impaired.

In addition to the above, another important reason for the lack of lap dimensions is that during the erection of the core material, the core material is guided by a core material insertion guide at the ground level, but at the tip of the core material The deeper the drilling depth, the
This is due to the drooping due to gravity, which increases the shaking of the tip and causes irregularities in the installation accuracy of the core material. If such construction accuracy cannot be maintained, after the soil cement column row is completed, the soil cement column will be scraped down to the surface of the core material for strut construction work, so the core material 7 will have holes as shown in Figure 12. 8, the wall thickness 10 of the lap portion 9 of the hole 8 is reduced to a thin wall thickness 11, and the water stop column is damaged. In addition, if the core material 7 is deviated from the center of the hole 8 in this way, when pouring the concrete 12 for the underground outer wall, the concrete 13 will dig in to the outside of the normal thickness, resulting in the need for extra concrete. There is a difference in size between the flange surface of the H-beam core material and the riser, and large amounts of filling mortar are required in areas with large gaps, making it difficult to perform strut erection work smoothly. Moreover, if a large number of core materials are inserted at once, it is difficult to control many core materials at once and ensure construction accuracy, so it is inefficient because they are inserted one by one. The dot was hot.

Means for Solving the Problems In order to solve the above problems, the present invention consists of (1) drilling the post holes in the column row of the preceding unit with a multi-axis auger rod, injecting cement milk into each post hole and stirring it; A preceding unit step in which the rear auger rod is pulled out, and then a guide piece is attached to the lower end of the core member with a guide that guides the multi-axis auger rod of the trailing unit, and each core member is inserted by attaching a guide piece that uses the inner surface of each post hole as a guide;
A multi-axis auger rod guided by the guide is used to perforate the columns of the trailing unit, and after injecting and stirring cement milk into each column hole, the auger rod is pulled out, and then the inner surface of each column hole is inserted into the lower end of the column as a guide. (2) A multi-axis auger rod is used to drill the column holes of the preceding unit column, and cement is inserted into each column hole. After injecting and stirring the milk, pull out the auger rod, and then attach a guide piece using the inner surface of each post hole as a guide to the lower end of the guided core material that guides the multi-shaft auger rod and core material of the trailing unit. The preceding unit step involves inserting the material, and the subsequent unit column rows are perforated with a multi-axis auger rod guided by the guide. After pouring cement milk into each column hole and stirring, the auger rod is pulled out. This is a multi-axis soil cement column construction method consisting of a trailing unit step in which a series of core materials are simultaneously inserted by guiding a connecting plate connecting the lower parts of a series of core materials by a guide.

Function This invention performs the preceding unit process of drilling the column holes in the column row of the preceding unit with a multi-axis auger rod, injecting cement milk, stirring, pulling out the auger rod, and inserting the core material. Once the hole is drilled, the core material is accurately inserted into the center of the post hole by the guide piece. Then, the multi-shaft auger rod of the trailing unit is guided by the guide attached to the core material inserted in the correct position to perform precise drilling. After cement milk is injected and stirred and the auger rod is pulled out, the core material is guided. A single piece can be inserted into the center of the post hole with high precision, or a connecting piece connecting the core material can be inserted with high precision using the guide as a guide.

Embodiment First, a first embodiment of the first invention will be described with reference to the drawings.

The auger rod 2 of the four-shaft soil auger machine 1 shown in FIG. 10 perforates the columns of the preceding unit shown in FIG. After that, the auger rod 2 is pulled out, and the core material 21 is then inserted into the outermost post hole 20 of the preceding unit as shown in FIGS. 1 to 3. At this time, the core material 21
An angle-shaped guide 24 for guiding the shaft 23 provided at the outer end of the connecting bearing 4 of the auger rod 2 of the trailing unit is attached to the web 22 of H-shaped steel, and attached to the lower end of the core member 21 as shown in FIG. The guide piece 25 shown in FIG. 1 is attached, each core material 21 is inserted, and the preceding unit process is completed. In this case, the guide piece 25 is the eighth
As shown in FIG. 9 and FIG.
7 is bent in the chord direction to form a leg portion 28, and the thin flat body 31 made of synthetic resin is provided with a concave groove 30 for holding the core material 21 in the end surface 29 of the leg portion 28.

Next, the post holes 20 of the trailing unit are bored with the multi-shaft auger rod 2 guided by the shaft 23 of the connecting bearing 4 by the guide 24, cement milk is injected into each post hole 20, and the stirring blade of the auger rod 2 is drilled. After stirring in step 3, pull out the auger rod 2, and then attach the guide piece 25 shown in FIGS. 8 and 9 to the lower end.
The core material 21 with the attached core material 21 is inserted to complete the subsequent unit process and complete the construction of the multi-axial soil cement column row.

A second embodiment of the second invention will be described below with reference to the drawings.

The preceding unit process is the same as the first embodiment, and the subsequent unit process is as follows.

Guide 2 attached to the core material 21 of the preceding unit
After drilling the column rows of the trailing unit with the multi-shaft auger rod 2 guided by the shaft 23 of the connecting bearing 4 by 4, cement milk 2 is injected into each column hole 20 and stirred with the stirring blade 3 of the auger rod 2. The auger rod 2 is pulled out, and as shown in FIGS. 4 to 7, the lower end 32 of the core material 21 made of H-beam steel is connected with a notch 34 into which the web 33 of the core material 21 is fitted. A plate 35 is welded, and its upper end 36 is connected to the web 33 of the core material 21 between it and a horizontally long H-beam 37.
The H-shaped steel 37 is suspended by wires 38 provided at equal intervals to the post holes 20, and the core material 21 is guided by the guide 24 with its lower end 32 at the end 39 of the connecting plate 35. It is inserted into the post hole 20 to complete the trailing unit process, thus completing the construction of the multi-axial soil cement post array.

Effects of the Invention The first invention is that if the drilling of the leading unit is performed accurately, the auger rod of the trailing unit is guided by the guide of the core material of the leading unit, ensuring drilling accuracy and preventing insufficient lap. Water-stopping properties are not impaired. Even with the complete wrap construction method, the trailing unit is placed accurately, ensuring watertightness.

In addition, the guide piece attached to the tip of the core material prevents it from being deviated from the center of the post hole, so when pouring concrete for the underground exterior wall, it does not dig deeper than the normal wall thickness, and therefore no excess material is inserted. This method does not require concrete, and since no large gap is created between the core material and the rib during strut erection work, the work can be carried out smoothly without the need for a large amount of mortar.

In addition to the above, the second invention is that even if a large number of core materials are inserted at once, the connecting pieces of the core materials are guided by a guide, so each core material is inserted uniformly and accurately, improving construction accuracy. Since it can be secured, the core material can be made into a unit, which can contribute to shortening the construction period.

[Brief explanation of the drawing]

1 to 9 show a first embodiment and a second embodiment of the present invention, FIG. 1 is a cross-sectional plan view during drilling, and FIG. 2 is a partial view showing the lower part of the auger rod. Figure 3 is a front view, Figure 3 is a perspective view showing a part of the coupling bearing, Figure 4 is a cross-sectional plan view when the core material is inserted, Figure 5
The figure is a front view of part 1 showing the lower part of the core material, Figure 6 is a front view showing the connecting plate, and Figure 7 is a front view of part 1 showing the upper part of the core material.
8 is an enlarged cross-sectional view showing a state in which the guide piece is attached to the core material, and FIG. 9 is a side view of the same.
Figure 10 is a front view of the soil auger machine,
Figures 1 and 12 show conventional examples.
The figure is a cross-sectional plan view showing the complete wrap construction method, and FIG. 12 is a cross-sectional plan view showing a case where the core material is inserted incorrectly. 2... Auger rod, 20... Post hole, 21... Core material, 24... Guide, 25... Guide piece, 35... Connecting plate,... Leading unit,... Trailing unit.

Claims (1)

[Scope of Claims] 1 The multi-axis auger rod 2 is used to drill the post holes 20 of the leading unit column row, and after pouring cement milk into each post hole 20 and stirring, the auger rod 2 is pulled out, and then the multi-axis auger rod 2 is drilled. A preceding unit step in which a guide piece 25 that uses the inner surface of each post hole 20 as a guide is attached to the lower end of the core material 21 with a guide 24 that guides the shaft auger rod 2, and each core material 21 is inserted;
The multi-axis auger rod 2 guided by the guide 24 perforates the columns of the trailing unit, and after injecting cement milk into each column hole 20 and stirring, the auger rod 2 is pulled out, and then each column hole is drilled in the lower end. 2
A method for constructing a row of multi-axis soil cement columns, which includes a subsequent unit step of inserting a core material 21 with a guide piece 25 attached to the inner surface as a guide. 2 The multi-shaft auger rod 2 is used to drill the post holes 20 in the column row of the leading unit, and after pouring cement milk into each post hole 20 and stirring, the auger rod 2 is pulled out, and then the multi-shaft auger rod 2 and the core material of the following unit are A preceding unit step in which a guide piece 25 that guides the inner surface of each post hole 20 is attached to the lower end of the core material 21 with a guide 24 for guiding the core material 21 and each core material 21 is inserted; A multi-axis auger rod 2 is used to drill holes in the trailing unit column rows, and after pouring cement milk into each column hole 20 and stirring, the auger rod 2 is pulled out, and then the guide 24 connects the lower part of the series of core materials 21. A construction method for constructing a row of multi-axial soil cement columns, which comprises a subsequent unit step in which a series of core materials 21 are simultaneously inserted by guiding a connected connecting plate 35.