JP3573260B2 - Continuous hole drilling method and apparatus - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a continuous hole excavation method for drilling a continuous hole in the ground for improving the ground or creating a water blocking wall, and an apparatus therefor.
[0002]
[Prior art]
For example, when constructing a water blocking wall in the ground, a continuous hole that is partially wrapped is excavated, and a soil cement column is created to form a continuous wall. As a method of drilling a hole, primary drilling is performed using a drilling device in which a plurality of drilling rods having stirring blades provided therearound are arranged side by side so that the rotation trajectories of the stirring blades overlap each other, and then secondary drilling is performed. In such a manner that a part of the hole is wrapped around the end of the continuous hole drilled by the first excavation, and as a result, a row of drill holes (a), (b), and (c) as shown in FIG. 10 is formed. It is common to do.
[0003]
[Problems to be solved by the invention]
However, in the above-described conventional method, when each excavation rod is bent due to the hardness and softness of the excavation ground, continuity between the rows of excavation holes arranged in parallel may be lost, and the underground wall to be formed is discontinuous. There is a problem that reliability may be lacking and reliability may be lacking.
[0004]
On the other hand, in order to avoid occurrence of the above-mentioned problems, drilling is performed by greatly overlapping the existing drilling hole row and the next drilling hole row, but this significantly reduces the construction efficiency. I can't deny it.
[0005]
An object of the present invention is to provide a continuous hole excavation method capable of efficiently drilling a continuous hole in the ground and a drilling apparatus suitable for performing the method.
[0006]
[Means for Solving the Problems]
As a means for solving the above-mentioned problems, the continuous hole excavation method according to the present invention comprises a small-diameter single hole, a large-diameter hole, and a small-diameter double hole arranged side by side in a direction orthogonal to a continuous hole construction direction. The first excavation for drilling is performed, and the second excavation is performed so that the next small-diameter single hole wraps around the existing small-diameter double hole and large-diameter hole, and thereafter, this procedure is repeated to form a continuous hole. Preferably, a large-diameter hole formed by a main drilling rod rotatably driven at a lower end of a driving device and having stirring blades around the periphery thereof, and one side of the main drilling rod is provided. A small diameter single hole formed by one first sub drilling rod having a stirring blade having a rotation radius smaller than that of the stirring blade and partially surrounding the rotation locus of the stirring blade of the main drilling rod. And other than the main drilling rod And has a stirring blade having a rotation radius smaller than that of the stirring blade and partially wrapped around the rotation trajectory of the stirring blade of the main excavation rod, and is orthogonal to the continuous hole construction direction. After the first excavation for simultaneously drilling two small-diameter double holes by two second sub-drilling rods arranged side by side at an interval in the direction of The continuous drilling is performed by performing the second excavation so as to partially overlap the large-diameter hole and the two small-diameter double holes.
[0007]
Further, as an apparatus for performing the above method, it is preferable that at least one of the first and second excavation rods be capable of turning at least 90 degrees or more with respect to the continuous hole construction direction when changing the continuous direction of the continuous hole. It is preferable for obtaining continuity.
[0008]
In addition, the first and second sub drilling rods are preferable for simplifying the drive device by receiving the rotation of the main drilling rod and rotating the driven drilled rod.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the present invention will be described with reference to embodiments shown in the drawings.
[0010]
FIG. 1 is an overall front view of an embodiment of a drilling apparatus used for drilling a continuous hole according to the present invention, and FIG. 2 is an enlarged front view of a main part thereof.
[0011]
In this embodiment, a case is shown in which two main excavating rods 1A and 1B are provided, and the upper ends of these main excavating rods 1A and 1B are along a tower 3 erected on a self-propelled work machine 2. It is connected to output shafts 6 and 6 of a driving device 5 supported by a wire rope 4 so as to be able to move up and down, and is rotatably driven. ing.
[0012]
At the lower ends of the main drilling rods 1A and 1B, drilling heads 8, 8 are provided, and on the peripheral surface above the drilling heads 8, 8, a plurality of stages of stirring blades 9, 9 are provided, respectively. As shown in FIG. 3, the blades 9, 9 have a radius of rotation in which their rotation trajectories a, b partially overlap.
[0013]
The lower portions of the main drilling rods 1A, 1B are connected by connecting members 10, 10 at vertically spaced positions. At the connecting position by the connecting members 10, 10, the first connecting box 11A, 11B, second connecting boxes 12A and 12B are attached to the main excavating rod 1B so as to be pivotable in a horizontal plane.
[0014]
The upper and lower ends of one first sub drilling rod 13 are pivotally supported between the first connection boxes 11A and 11B, and the second connection boxes 12A and 12B have a V-shape in plan view as seen in FIG. The upper and lower ends of two second sub drilling rods 14, 14 are pivotally supported between the respective distal ends of the branched branch boxes 12a, 12a. Are arranged at right angles to the continuous hole construction direction Y.
[0015]
Excavation heads 15 and 16 are provided at the lower ends of the first and second sub-excavation rods 13 and 14, and stirring blades 17 and 18 are provided on the peripheral surface above them. The interval between the second sub-drilling rods 14, 14 is set at the rotation trajectory c of the stirring blades 18, 18 of the rods 14, 14, as shown in FIG. The rotation trajectory d is set to partially overlap.
[0016]
The first sub-drilling rod 13 and the second sub-drilling rods 14, 14 are driven to rotate by receiving rotation transmitted from the main drilling rods 1A, 1B.
[0017]
In the illustrated embodiment, a case where a gear train is used for transmitting the rotation is shown. As shown in FIG. 4A, the first sub drilling rod 13 is provided in the lower first connection box 11B with the first sub drilling rod 13B. A gear 19 fixed to the main drilling rod 1A on the side of the drilling rod 13 is meshed with a gear 20 fixed to the first sub-digging rod 13 via an intermediate gear train 21. In the second connecting box 12B, the gears 22 fixed to the main drilling rod 1B on the side of the second sub-digging rods 14, 14 are connected to the gears 23, 23 fixed to the second sub-digging rods 14, 14 in the respective branch boxes 12a, 12a. Through the intermediate gear trains 24, 24, and through these gears, the rotational driving force of the main excavation rods 1A, 1B is transmitted to the first and second sub-excavation rods 13, 14 and 14. There. The rotation transmitting means may be a sprocket and a chain other than the gear transmission.
[0018]
In each of the main drilling rods 1A, 1B, chemical supply paths 33, 33 for supplying a chemical such as cement milk are provided as a double-pipe structure similarly to a normal drilling rod. The lower end of the inner pipe of 33 is communicated with a discharge port opened at the lower end of the excavating heads 8, 8, and the outer pipe of the chemical supply paths 33, 33 is connected to the upper first and second connection boxes 11A, 12A. , And communicate with the chemical liquid supply paths 13a and 14a in the first and second sub drilling rods 13 and 14 through the branch passages 33a and 33a in the boxes 11A and 12A, similarly to the main drilling rods 1A and 1B. Are connected to discharge ports at the lower ends of the excavating heads 15 and 16, and both are configured to discharge a chemical solution into excavated soil.
[0019]
In the illustrated embodiment, the first connection boxes 11A and 11B and the second connection boxes 12A and 12B respectively adjust the axes of the main excavation rods 1A and 1B in consideration of the case where the excavation execution direction Y of the continuous hole is bent halfway. The connecting box 11A, 11B, 12A, 12B is restrained with respect to the connecting member 10 in a non-turning state and in a turning state in a range of 90 degrees in any direction with respect to the passing center line. It has a restraining means.
[0020]
That is, in the illustrated example, when the first connection boxes 11A and 11B and the second connection boxes 12A and 12B are located on the center line connecting the axes of the main excavating rods 1A and 1B (when not turning), they are connected so as to be aligned. Brackets 25, 26, 27, 28 are provided on the members 10, 10, the first connection boxes 11 A, 11 B, and the second connection boxes 12 A, 12 B, and locking pins 29 are provided in holes of the brackets 25, 26, 27, 28. , 30 are fixed to each other so that the connection boxes 11A, 11B, 12A, 12B are fixed.
[0021]
When the first connection boxes 11A and 11B and the second connection boxes 12A and 12B are turned by 90 degrees, another bracket 31, 32 is protruded from the connection member 10, 10 at a position where the brackets 26, 28 are aligned. When the first connection boxes 11A and 11B and the second connection boxes 12A and 12B are turned 90 degrees in either direction, the brackets 26, 31 and 28 and 32 are aligned and the locking pins 29 and By inserting the connector 30, each connection box is fixed at the turning position.
[0022]
Next, the procedure of the continuous hole excavation work will be described.
[0023]
When excavating the continuous hole, the work machine 2 is moved to the excavation start end position of the continuous hole, the driving device 5 is activated, and each of the main excavation rods 1A and 1B is rotated to start excavation. At this time, the rotation of the main sub-drilling rods 1A and 1B is also driven by the rotation of the main sub-drilling rods 1A and 1B through the gear train, and the first and second sub-excavation rods are also excavated together with the sub-drilling rods 1A and 1B. Excavation with the rods 13, 14, 14 is performed.
[0024]
During this excavation, excavation is advanced while discharging a chemical such as cement milk from the tip through the chemical supply paths 33, 33 and 13a, 14a in the main excavation rods 1A, 1B, and the stirring blades 9, 9, 17, 18 during that time The excavation is advanced to a predetermined depth as shown in FIG. 5 while stirring and mixing the excavated earth and sand with the chemical solution. Thereafter, the main excavation rods 1A and 1B are rotated and the earth and sand and the chemical liquid are stirred and mixed while being reversed, and then pulled up to the ground to complete the first excavation.
[0025]
As shown in FIG. 6 in a longitudinal section and as shown in FIG. 8B in a plane, large holes A and B formed by main drilling rods 1A and 1B are formed by the first drilling. Then, the small-diameter single hole D formed by the first sub-drilling rod 13 and the small-diameter double hole C formed by the second sub-drilling rods 14 and 14 are respectively drilled in a partially wrapped state.
[0026]
Next, when forming a continuous hole in the direction of the arrow Y in FIG. 3, the first sub drilling rod 13 is inserted between the small-diameter double holes C, C by the primary drilling as shown in FIGS. 7 and 8C. The work machine 2 is moved so that the line connecting the centers of the large-diameter holes A and B and the line connecting the axes of the main excavation rods 1A and 1B are aligned, and the second excavation is performed in the first excavation. Perform in the same way as excavation.
[0027]
At this time, even if each of the main excavation rods 1A and 1B is bent due to the softness or the like of the ground, the first sub-excavation rod 13 in the second excavation is drilled in a state in which a part of the first excavation rod 13 is wrapped around the large-diameter hole B by the first excavation. The continuity of the holes is maintained.
[0028]
In this manner, the digging of the third, fourth,.
[0029]
Next, when the construction direction of the continuous hole is changed by 90 degrees, the locking pins 30, 30 that restrain the second connection boxes 12A, 12B that support the second auxiliary excavation rods 14, 14 are pulled out, and the second connection is performed. The boxes 12A and 12B are released from the restraint and turned 90 degrees as shown in FIG. 4B. At this time, the locking pins 30 are inserted into the matching brackets 28 and 32, and the upper and lower second connection boxes 12A and 12B are connected. Are restrained in a state where they have both turned 90 degrees.
[0030]
When the excavation is started in this manner, the small-diameter double holes C, C are drilled at the positions turned by 90 degrees, and the first sub drilling rod 13 is positioned between the small-diameter multiple holes C, C at the next drilling. By positioning the work machine 2 and returning the second connection boxes 12A and 12B to the original state (shown in FIG. 4) and repeating the excavation in the same manner as described above, it is possible to excavate a continuous hole row as shown in FIG. it can.
[0031]
In the above construction example, the case where the second sub-drilling rods 14 and 14 are performed on the front side in the continuous hole construction direction is shown, but the first sub-drilling rod 13 may be excavated on the front side in the construction direction. When the construction direction is changed in this case, the direction can be changed by changing the direction of the first connection boxes 11A and 11B on the side of the first auxiliary excavation rod 13 by replacing the locking pins 29 and 29 in the same manner as described above. In the case where the traveling direction at the time of construction is limited to any one, only the connection box on the side that is the traveling direction may be turned.
[0032]
In the illustrated embodiment, the case where the number of main excavation rods is two is shown, but it is needless to say that the number of main excavation rods may be one or three or more.
[0033]
【The invention's effect】
As described above, according to the present invention, a continuous hole is formed by continuously drilling a large hole, a small single hole, and two small double holes as a unit. Since the excavation was made, even if each excavation rod is bent due to the softness of the excavation ground during excavation, it is possible to avoid discontinuity of the excavated hole as much as possible. It does not hinder the development.
[Brief description of the drawings]
FIG. 1 is an overall front view showing an embodiment of a continuous hole drilling apparatus according to the present invention.
FIG. 2 is an enlarged front view of the main part.
FIG. 3 is a plan view showing a range of a hole excavated by the excavator shown in FIGS. 1 and 2;
4 (A) is a sectional view taken along line XX of FIG. 2 showing an example of driven rotation transmitting means of the first sub drilling rod and the second sub drilling rod in FIG. 1 and FIG. 2, and FIG. Sectional drawing which shows the state which turned the 2 connection box 90 degrees.
FIG. 5 is a front view showing a state during excavation.
FIG. 6 is a sectional view of a hole drilled in the first excavation.
FIG. 7 is a front view showing a state at the start of the second excavation.
FIG. 8 shows a continuous hole excavation process, (A) is a diagram corresponding to FIG. 3, (B) is a plan view showing a hole shape drilled by the first excavation, and (C) is a diagram at the time of the second excavation. The top view showing a state.
FIG. 9 is a plan view showing a form example of a continuous hole drilled according to the present invention.
FIG. 10 is a plan view showing an example of a form of a continuous hole according to a conventional technique.
[Explanation of symbols]
1A, 1B Main excavation rod 5 Drive 8, 15, 16 Excavation head 9, 17, 18 Stirrer blade 10 Connection member 11A, 11B First connection box 12A, 12B Second connection box 13 First sub drill rod 14 Second sub Drilling rods 29, 30 Locking pins A, B Large diameter hole C Small diameter double hole D Small diameter single hole

Claims (5)

The first excavation is performed in which a small-diameter single hole, a large-diameter hole, and a small-diameter double hole arranged side by side in a direction perpendicular to the continuous hole construction direction are wrapped with each other and drilled simultaneously to perform a first excavation. A second excavation is carried out so as to wrap around an existing small-diameter double hole and large-diameter hole, and thereafter, this procedure is repeated to form a continuous hole excavation method. A large-diameter hole formed by a main excavation rod rotatably driven at the lower end of the driving device and having stirring blades around it, and a main drilling rod provided on one side of the main excavation rod and rotatably driven around the main excavation rod. A small-diameter single hole formed by a single first sub-drilling rod having a stirring blade having a rotation radius smaller than that of the stirring blade and partially overlapping with the rotation trajectory of the blade; The main drilling rod is provided with a stirring blade having a rotation radius smaller than that of the stirring blade and partially overlapping with the rotation locus of the stirring blade of the main excavating rod, and is spaced apart from each other in a direction orthogonal to the continuous hole forming direction. After the first excavation to simultaneously drill two small-diameter double holes by the two second sub-drilling rods arranged side by side, the next small single hole is replaced with the existing large-diameter hole and two small-diameter single holes. Partly wraps around small diameter double hole Continuous holes drilled method of claim 1 wherein so as to construct a continuous row of holes by performing the secondary drilling. A main excavation rod that is rotatably driven at the lower end of the drive device, has a drilling head at the lower end, and has stirring blades around it. A first sub drilling rod having a head and having a stirring blade having a rotation radius smaller than that of the stirring blade and partially wrapping around the rotation locus of the stirring blade of the main drilling rod; It is provided on the other side and is rotatably driven, has an excavating head at the lower end, and has a stirring blade having a rotation radius smaller than the stirring blade and partially wrapped around the rotation locus of the stirring blade of the main drilling rod. A continuous excavator comprising: two second sub-excavation rods which are arranged side by side at an interval in a direction orthogonal to a construction direction. The continuous hole drilling apparatus according to claim 3, wherein at least one of the first and second sub drilling rods is capable of turning at least 90 degrees or more with respect to the continuous hole construction direction. 5. The continuous hole drilling apparatus according to claim 3, wherein the first and second sub drilling rods are driven to rotate by transmitting rotation of the main drilling rod via rotation transmission means. 6.

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