JPH0819678B2 - A device that is inserted into the ground for underground work such as excavation and stirring. - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for performing underground work such as excavation of the ground by inserting it into the ground or stirring and mixing soil in the ground with a consolidation liquid. It is about.

[0002]

2. Description of the Related Art Conventionally, a device having a multi-axis rotating shaft has been known as a device for excavating the ground by inserting it into the ground, and stirring and mixing the soil in the ground and the consolidation liquid. Has been. For example, in Japanese Unexamined Patent Publication No. 58-37233, three rotary shafts 1 are arranged in a line as shown in FIG. It is known that excavated earth and sand and a congealing liquid such as cement milk discharged from a rotary shaft are stirred and mixed to form a columnar body in which three columnar bodies are continuous in the ground in one operation. There is.

Another conventional example is Japanese Patent Laid-Open No. 4-3.
As shown in Japanese Unexamined Patent Publication No. 33715, five rotary shafts 1 are arranged in a line, on a line that is perpendicular to a line connecting the shaft cores of the five rotary shafts 1 and passes through the rotary shaft 1 at one end. The arrangement of the sixth rotary shaft 1 (see FIG. 8) and the five rotary shafts 1
Are arranged in a line, and the sixth and seventh rotating shafts 1 are arranged on the respective lines that are orthogonal to the line connecting the shaft centers of the five rotating shafts 1 and pass through the rotating shafts 1 at both ends. This is known (see FIG. 9).

[0004]

[SUMMARY OF THE INVENTION However, in the conventional example described above, like by arranging the rotating shaft 1 of the three shown in JP-Open Sho 58 over 37,233 in a line, the rotary shaft 1
7 are different from each other in rotation direction. For example, in FIG. 7, the two rotary shafts 1 are rotated clockwise and the one rotary shaft 1 is rotated counterclockwise, whereby efficient stirring is performed. However, in the embodiment of FIG.
One rotating shaft 1 is rotated clockwise, and one rotating shaft 1 is rotated counterclockwise. Therefore, if the entire device tries to rotate clockwise (direction of arrow A in FIG. 7) and the rotating shaft 1 becomes longer, , The longer it becomes, 3 in the direction of arrow a in Fig. 7.
The lower end of the rotary shaft 1 of the book will be twisted as a whole in the direction of arrow A, and the columnar body to be formed will be twisted and formed, and the desired accurate columnar body cannot be formed in the ground. There is a problem.

Further, in the conventional example of FIG. 8, the number of rotating shafts 1 rotating clockwise is the same as the number of rotating shafts 1 rotating counterclockwise, but the whole is not symmetrical. Therefore, in the case of FIG. 8, it tries to rotate clockwise (direction of arrow A in FIG. 8) as a whole, and in the conventional example of FIG. 9, it rotates counterclockwise with the number of rotating shafts 1 rotating clockwise. The number of rotating shafts 1 to be
In the case of FIG. 9, it is attempted to rotate counterclockwise (in the direction of arrow B in FIG. 9) as a whole, and as a result, a plurality of rotating shafts 1
The lower end of the whole will be twisted clockwise or counterclockwise as a whole, and in this case as well, the columnar body to be formed will be twisted and formed, and the desired accurate columnar body cannot be formed in the ground. There is a problem.

By the way, when a plurality of rotating shafts are arranged in a line, the rotating shafts are twisted clockwise or counterclockwise as a whole by arranging them in an even number, for example, four lines in a row and making the rotating directions of adjacent rotating shafts different. It is possible to prevent it, but
Conventionally, in a case where a plurality of rotating shafts are arranged in a line,
It is common to line up odd numbers. This is because the rotation loci drawn by the bits provided at the lower end of the rotation shaft are such that the adjacent rotation loci partially overlap each other in plan view, so it is necessary to shift the positions of the adjacent bits in the vertical direction. Therefore, the positions of the lower end of the rotary shaft at one end and the end of the rotary shaft at the other end are different in the vertical direction. On the other hand, as a conventional construction method, after forming a first excavation hole in which a plurality of holes are continuous, a second excavation hole in which a plurality of holes are continuously formed at intervals is formed. While inserting the rotary shafts on both sides into the hole at the end of the first drill hole and the hole at the end of the second drill hole, the rotary shafts between the first drill hole and the second drill hole are used as guides. There is one that excavates the uncut portion, but when using the above-mentioned 4-axis device for this construction method, it was provided at the lower end of the rotating shaft at one end and the third rotating shaft Since the bit is located below the second rotary shaft and the bit provided at the lower end of the rotary shaft at the other end, the lower end of the rotary shaft at both ends at the start of excavation of the uncut portion Simultaneously insert into the hole at the end of the first drill hole and the hole at the end of the second drill hole, and start drilling using this as a guide. It can not be called that, therefore,
It is unrealistic to arrange four rotary shafts in a line in a row, and it is currently not used.

The present invention has been made in view of the above-mentioned problems of the prior art, and its purpose is to insert into the ground which can eliminate twist when it is inserted into the ground and rotated. The purpose is to provide a device for performing underground works such as excavation and stirring.

[0008]

In order to solve the problems of the above-mentioned conventional examples and to achieve the object of the present invention, in the present invention, underground work such as excavation and agitation is performed by inserting into the ground. The three rotating shafts 1 are arranged such that their axes are aligned in a straight line, and the three rotating shafts 1 pass through the central rotating shaft 1a and the above-mentioned three rotating shafts 1 are arranged. The four rotary shafts 1b are arranged in a T-shape in plan view with the center of the fourth rotary shaft 1b positioned on a line orthogonal to the line connecting the axis cores of
The two rotating shafts 1 are connected by the connecting device 2, and the rotating directions of the two rotating shafts 1 out of the four rotating shafts 1 and the rotating directions of the other two rotating shafts 1 are set to opposite directions. It is characterized by consisting of.

Further, the excavation means 5 is provided at the lower end of the rotary shaft 1, and the rotation loci drawn by the adjacent excavation means 5 are set so as to partially overlap each other in plan view, and three rotations arranged in a straight line are formed. It is also preferable that the level of the excavating means 5 provided at the lower ends of the rotary shafts 1c and 1d on both sides of the shaft 1 is located below the level of the excavating means 5 provided at the lower end of the central rotary shaft 1a. It is also preferable to provide a congealing liquid ejecting section for ejecting a congealing liquid such as cement milk on any one of the four rotary shafts 1. Also, four rotary shafts 1
And a rotation locus of the stirring means 4 provided on the central rotating shaft 1a of the three rotating shafts 1 arranged in a line and the remaining three rotating shafts of the four rotating shafts 1. It is also preferable to set the rotation loci of the stirring means 4 provided on the shaft 1 so as to partially overlap each other in plan view.

[0010]

According to the present invention having the above-mentioned structure, however, the three rotary shafts 1 are arranged so that the axes thereof are aligned, and the central rotary shaft 1a of the three rotary shafts 1 is arranged. The four rotary shafts 1 are arranged in a T-shape in plan view with the center of the fourth rotary shaft 1b positioned on a line that passes through and intersects with the line connecting the axes of the three rotary shafts 1. The four rotating shafts 1 are connected by the connecting device 2, and the rotating directions of the two rotating shafts 1 out of the four rotating shafts 1 are opposite to the rotating directions of the other two rotating shafts 1. Since the number of rotating shafts 1 having different rotating directions is the same, and is symmetrical in plan view, it is balanced as a whole and does not twist in the ground as a whole. Is something that can be done.

Then, the excavation means 5 is provided at the lower end of the rotary shaft 1, and the level of the excavation means 5 provided at the lower end of the rotary shafts 1c and 1d on both sides of the three linearly arranged rotary shafts 1 is set. By arranging it below the level of the excavation means 5 provided at the lower end of the central rotating shaft 1a, the first excavation holes in which four holes are arranged in a substantially T-shape are formed, and then the first excavation holes are spaced apart from each other. Four holes form a second drilled hole in which the holes are arranged in a substantially T-shape, and then the second drilled hole and the hole located at the end of the three drilled holes of the first drilled hole are arranged. While inserting the rotary shafts 1c and 1d on both sides of the three rotary shafts 1 arranged in a row into the holes located at the ends of the holes arranged in a line, The uncut portion between the second drilled hole can be drilled.

Further, by providing a consolidating liquid ejecting section for ejecting a consolidating liquid such as cement milk on any one of the four rotary shafts 1, it is possible to solidify the soil and sand in the ground. A mixture with the binding solution can be formed. The stirring means 4 is provided on each of the four rotary shafts 1, and the three rotary shafts 1 arranged in line are provided.
A rotation locus of the stirring means 4 provided on the rotation shaft 1a at the center of
By setting the rotation loci of the stirring means 4 provided on the remaining three rotation shafts 1 out of the four rotation shafts 1 to partially overlap each other in plan view, the plan view in the ground is substantially T. It is possible to form a column body in which the earth and sand in the ground and the congealing liquid are stirred and mixed in the V-shaped hole.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the embodiments shown in the accompanying drawings. 1 to 6 show the device of the present invention. In the present invention, as shown in FIGS. 2 and 3, an elevating body 12 is vertically movably mounted along a leader 7 provided on a traveling device 6 such as a crawler crane.
A rotary device 13 and a multi-axis device 10 are provided on the multi-axis device 2, and the upper ends of four rotary shafts 1 are attached to the multi-axis device 10. The four rotary shafts 1 are rotated via the multi-axis device 10 by rotating the rotary device 13. Two of the four rotary shafts 1 are in the same direction, and the other two rotary shafts 1 are in the same direction. Is designed to rotate in the opposite direction. Of the four rotary shafts 1, three rotary shafts 1 are arranged side by side so that their axes are aligned in a straight line, and the remaining one rotary shaft 1b is the three rotary shafts 1 arranged in a line. Of the rotary shafts 1, the center is located on a line that passes through the central axis of the central rotary shaft 1a and is orthogonal to the line that connects the central axes of the three rotary shafts 1, and the four rotary shafts 1 Are arranged in a substantially T shape in a plan view.

Here, a bit serving as the excavating means 5 is provided at the lower end of each rotary shaft 1. The rotation trajectories drawn by the adjacent excavation means 5 are set so as to partially overlap each other in a plan view, and therefore, the adjacent excavation means 5 are displaced from each other in the vertical direction. Out of the three rotary shafts 1 arranged in a straight line, the rotary shafts 1c and 1d on both sides
The level of the excavation means 5 provided at the lower end of the
It is located below the level of the excavating means 5 provided at the lower end of a, and the level of the excavating means 5 provided at the lower end of the fourth rotating shaft 1b is set at the lower end of the central rotating shaft 1a. It is located below the level of the excavation means 5 provided.
That is, the excavating means 5 provided at the lower ends of the rotary shafts 1b, 1c, 1d is located below the lower end of the excavating means 5 provided at the lower end of the rotary shaft 1a, and the rotary shafts 1b, 1c,
The excavation means 5 provided at the lower end of 1d are at the same level.

An arbitrary rotary shaft 1 (4
The whole rotary shaft 1 may be provided, or 1 or 2 or 3 rotary shafts 1 may be provided), and a consolidating liquid ejecting portion (not shown) for ejecting a consolidating liquid such as cement milk is provided on the whole. Provided (this consolidating liquid discharger may be provided directly on the rotary shaft 1,
Alternatively, it may be provided on the excavation means 5 provided on the rotating shaft 1). Further, the rotating shaft 1 is provided with a stirring means 4 such as a screw portion or a blade at any position in the vertical direction. Here, the rotation locus of the stirring means 4 provided on the central rotating shaft 1a of the three rotating shafts 1 arranged in a line and the remaining three rotating shafts 1 of the four rotating shafts 1 are provided. The rotation loci of the stirring means 4 partially overlap each other in plan view. Therefore, the agitating means 4 adjacent to each other laterally are arranged vertically offset from each other.

The four rotary shafts 1 are connected by a connecting device 2. As shown in FIG. 1, the coupling device 2 has a substantially T-shape in plan view and is provided with four bearing portions 3. Three bearing portions 3 of the four bearing portions 3 are arranged in a line, and the remaining one is
One bearing portion 3 is located on a line orthogonal to the line connecting the shaft cores of the three bearing portions 3 and passing through the shaft core of the central bearing portion 3, and each of the four bearing portions 3 is 4 The four rotary shafts 1 are rotatably supported by being fitted into one rotary shaft 1. The connecting device 2 holds the four rotary shafts 1 arranged in a substantially T shape in a plan view.

As described above, an underground work such as excavation and agitation is performed in the ground by using the device in which the four rotary shafts 1 are arranged in a substantially T shape. For example, while excavating the ground by the excavating means 5 while rotating the four rotary shafts 1, the consolidating liquid is discharged from the consolidating liquid discharging part such as cement milk, and the stirring means 4 solidifies the excavated soil and sand. The binder solution is mixed and stirred to form a first excavation hole 9a having a substantially T-shape in plan view in which four holes 8 are arranged in a substantially T-shape in plan view, as shown in FIG. 5 (a). At the same time, the agitated mixture 10 of excavated soil and congealing liquid is filled in the excavation hole, and then, as shown in FIG. 5B, next to the first excavation hole 9a at a constant interval. Similarly, four holes 8 are formed in a substantially T-shape in a plan view to form a second excavation hole 9b in a substantially T-shape in a plan view, and the excavated earth and sand are fixed in the second excavation hole 9b. In filling the stirring mixture with the binding liquid and then starting the undigging portion between the first drill hole 9a and the second drill hole 9b, The excavation means 5 at the lower end of the rotary shafts 1 located at both ends of the three rotary shafts 1 arranged in a line among the rotary shafts 1 of the book are simultaneously provided with the hole 8 at the end of the first excavation hole 9a and the second excavation hole. The hole 9b is inserted into the hole 8 at the end of the hole 9b, and the excavation is started using this hole as a guide. In this way, as shown in FIG.
c is formed, and two holes 8 and 8'are partially overlapped in plan view by the rotating shafts 1a and 1b in the uncut portion between the first drilled hole 9a and the second drilled hole 9b. At the same time, this portion is filled with the agitated mixture 10 of excavated soil and congealing liquid. Similarly, as shown in FIG. 5D, the next excavation hole is formed next to the second excavation hole 9b at a constant interval, and the unexcavated portion is further excavated in the same manner.
By doing so, the holes 8 are continuous in the lateral direction (left-right direction) in a state where they partially overlap with each other in plan view, and holes 8'are formed behind each other hole 8 in plan view. At the same time, an underground wall formed by filling and hardening the stirring mixture of the excavated soil and the congealing liquid is formed in the row of holes 8 and the holes 8 '. Here, as shown in FIG. 5D, a core material 14a having a long width in the front-rear direction, such as H steel, can be inserted into a portion having a large width in the front-rear direction to improve the strength of the underground wall. Has become. Further, in the embodiment shown in the drawings, a core material 1 such as H steel having a narrow width in the front and rear direction is also used.
4b is inserted. Of course, the core material 14a or the core material 14b
Any of the above may be selected and used, and the core material 14
In some cases, a or the core material 14b is not inserted.

During the above construction, the four rotary shafts 1 connected by the connecting device 2 in a substantially T-shape in plan view have the same rotating directions of the two rotary shafts 1 as described above, and The rotation directions of the two rotary shafts 1 are opposite to each other, and the four rotary shafts 1 are symmetrically arranged.
Will not be twisted clockwise or counterclockwise as a whole.
That is, in FIG. 6, the rotating shafts 1a, 1b, 1c, 1d
6 and the rotational forces of the rotary shafts 1 are m ₁ , m ₂ , m ₃ and m ₄ , respectively (here, m ₁ , m ₂ , m ₃ , m ₄ are equal to each other), and when the distance between the axes of the rotary shafts 1 is L, the clockwise rotation moment M ₁ about the center O of the twist
Is M ₁ = m ₃ × L + m ₁ × 0.5 L = 1.5 mL, and the counterclockwise rotation moment M ₂ = m ₄ × L + m ₂ ×
0.5L = 1.5 mL, and as a result, M ₁ = M _2, and the four rotary shafts 1 connected by the connecting device 2 in a substantially T shape in a plan view rotate counterclockwise or clockwise as a whole. Will not be twisted.

In the above-mentioned embodiment, the congealing liquid is discharged while excavating the ground to stir and mix the excavated soil and the congealing liquid to mix the excavated sediment such as soil cement with the congealing liquid. Although the example in which the underground wall is formed by stirring is shown, a columnar body having a substantially T-shaped cross section may be formed independently. In addition, the above-mentioned device forms an excavation hole in a plan view substantially T-shaped in the ground,
The holes may be filled with concrete. In this case, the stirring means 4 may or may not be provided. In addition, when the ground is soft ground and the ground is improved, the excavation means 5 such as a bit may be provided. However, even if the excavation means 5 is not provided, the rotary shaft 1 is provided in the ground. If it is possible to insert, the excavation means 5 may not be provided. In this case, the rotary shaft 1 is inserted into the ground, and the soil is mixed with the solidifying liquid by the stirring means 4 while discharging the solidifying liquid to improve the ground.

[0020]

According to the present invention, as described above, the three rotary shafts are arranged so that the axes thereof are aligned, and the central rotary shaft of the three rotary shafts is passed through and The four rotary shafts are arranged in a T shape in a plan view by arranging the center of the fourth rotary shaft on a line orthogonal to the line connecting the axes of the three rotary shafts, and rotating the four rotary shafts. Since the shafts are connected by the connecting device and the rotation directions of the two rotation shafts of the four rotation shafts are set to be opposite to the rotation directions of the other two rotation shafts, respectively, the rotation directions are different. The number of rotating shafts is the same, and the arrangement of the four rotating shafts is symmetrical in plan view. As a result, the four rotating shafts connected by the connecting device are balanced as a whole, and as a whole, in the ground. The structure can be twisted. Moreover, even though the four rotary shafts are provided, since the three rotary shafts are arranged in a line, the three rotary shafts are arranged in the same manner as in the conventional case where the three rotary shafts are arranged. Since the lower ends of the rotary shafts at both ends of the rotary shaft can be located below the lower end of the rotary shaft at the central portion, the uncut portion between the first drill hole and the second drill hole is left. When excavating a part, the lower ends of the rotary shafts at both ends of the three rotary shafts are inserted into the holes at the end of the first excavation hole and the holes at the end of the second excavation shaft, respectively, and guided. However, it becomes possible to adopt a construction method in which the uncut portion can be excavated.

Excavating means is provided at the lower end of the rotary shaft,
The rotation loci drawn by the adjacent excavating means are set so as to partially overlap each other in plan view, and the level of the excavating means provided at the lower ends of the rotating shafts on both sides of the three linearly arranged rotating shafts is set to the center. If it is located below the level of the excavation means provided at the lower end of the rotating shaft of the, the excavation work can be performed in the ground, and the cement milk can be attached to any of the four rotating shafts. And the like, which is provided with a congealing liquid ejecting section for ejecting the congealing liquid, is capable of forming a mixture of the congealing liquid and soil in the ground, and has four rotations. Each of the shafts is provided with a stirrer, and the rotation locus of the stirrer provided on the central rotary shaft of the three rotary shafts aligned in a row and 4
When the rotation loci of the stirring means provided on the remaining three rotation shafts of the book rotation shaft are set so as to partially overlap each other in plan view, it is possible to consolidate with soil in the ground. It is possible to surely perform stirring and mixing with the liquid.

[Brief description of drawings]

FIG. 1 is a perspective view of an essential part of the present invention.

FIG. 2 is an overall front view of the above.

FIG. 3 is an overall side view of the above.

FIG. 4 is a horizontal sectional view of the above.

5 (a), (b), (c), and (d) are explanatory views showing one construction sequence of the above.

FIG. 6 is an explanatory diagram showing rotation directions and rotation forces of the above-described four rotation shafts.

FIG. 7 is a cross-sectional view of a device showing a conventional example.

FIG. 8 is a sectional view of an apparatus showing another conventional example.

FIG. 9 is a sectional view of an apparatus showing still another conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 rotary shaft 1a rotary shaft 1b rotary shaft 1c rotary shaft 1d rotary shaft 2 coupling device 3 consolidation liquid discharge part 4 stirring means 5 excavation means

Claims (4)

[Claims] 1. An apparatus for being inserted into the ground to perform underground construction such as excavation and stirring, wherein three rotary shafts are arranged such that their axes are aligned. Among the rotary shafts, the center of the fourth rotary shaft is located on a line that passes through the central rotary shaft and is orthogonal to the line connecting the shaft cores of the three rotary shafts. The four rotation shafts are arranged in a T-shape and connected by a connecting device, and the rotation directions of two rotation shafts of the four rotation shafts are opposite to the rotation directions of the other two rotation shafts. A device for underground work such as excavation and agitation that is inserted into the ground and is characterized by being set in the direction. 2. A digging means is provided at a lower end of a rotary shaft, and the rotary loci drawn by adjacent digging means are set so as to partially overlap each other in a plan view. 2. The ground according to claim 1, wherein the level of the excavating means provided at the lower ends of the rotating shafts on both sides is located below the level of the excavating means provided at the lower ends of the central rotating shafts. A device that is inserted to perform underground work such as excavation and agitation. 3. A consolidating liquid discharger for discharging a consolidating liquid such as cement milk is provided on an arbitrary one of the four rotary shafts. An apparatus for being inserted into the ground according to claim 2 for performing underground construction such as excavation and stirring. 4. A rotating locus of the stirring means provided on the central rotating shaft of the three rotating shafts arranged in a row, and the remaining one of the four rotating shafts. Of 3
4. The ground for excavation, stirring, etc. inserted into the ground according to claim 3, wherein the rotation loci of the stirring means provided on the rotary shaft of the book are set so as to partially overlap each other in plan view. A device for performing Nakauchi construction.