JP4091526B2 - Manufacturing method of dry columnar body of foundation ground - Google Patents

Description

The present invention relates to a method for manufacturing a dry columnar body of a foundation ground that supports a building such as a house.

In order to increase the load on the conventional dry columnar body, excavation and waste soil are first carried out by lowering the vertical auger in the forward rotation, the auger is once lifted, and another diameter expansion device is suspended or inserted into the obtained excavation hole. At least the diameter expansion hole is formed in the bottom and the diameter expansion tool is pulled up, and the mixture of waste soil and cement-based solid agent is put into the obtained drilling hole, and at the same time or after that, the auger is inserted in the normal direction again and pulled up in the reverse direction. A method is known in which the steps are repeated and sufficiently stirred, and finally the auger is gently reversed and raised from the bottom to roll the pressure.
However, in that case, it takes time to arrange the diameter-expanding device, and the problem that the cost of the apparatus increases is unavoidable.

As countermeasures, there have been proposed devices (Patent Documents 1 and 2) in which an auger is equipped with an enlarged blade that protrudes in the radial direction due to friction with the inner wall of the excavation hole during reverse rotation.
However, there is a problem that it is not possible to perform the rolling work by raising the auger while reversing it.

Japanese Patent Publication No.59-18487 Japanese Patent Laid-Open No. 2-108724

  In the present invention, by providing the auger itself with a hydraulic diameter expanding portion, in addition to excavation, agitation, and rolling action by the auger, the auger can be easily positioned at a desired location without raising the auger or inserting another instrument. The purpose of this is to make it possible to form an enlarged hole.

In the first aspect of the invention, the upper end portion of the auger 1 perpendicular to the downward output shaft 14 of the reversible motor 3 supported so as not to rotate is connected, and the excavating blade mounting portion 8 at the lower end of the auger is radially outwardly reversed. A projecting hydraulic enlarged portion 11 and a tip 25a which is a centering sword tip projecting downward from the center lower surface are provided, and a pipe for supplying hydraulic pressure to the hydraulic enlarged portion 11 is passed through the central tube 2 of the auger. It is connected to the hydraulic swivel 6 at the upper end, and the expanded hole 29 is excavated by the expansion cylinder 29 of the hydraulic expanded portion 11 in the excavated hole 26 excavated by the auger 1, and solidified by raising and lowering the auger 1 The drainage containing the agent is stirred, and the lower end portion of the auger 1 is arranged at the bottom of the excavation hole 26 filled with the well-stirred soil, and is slowly raised while being reversed so as to perform backfill rolling pressure. And wherein the a, a dry columnar body manufacturing method of the foundation ground.

Invention of Claim 2 is a dry-type columnar body manufacturing method of the foundation ground of Claim 1 in which piping is formed with the high pressure hose.

  According to the present invention, by providing the auger itself with a hydraulic enlarged portion, in addition to excavation, agitation, and rolling action by the auger, the auger can be moved to a desired location without raising the auger or inserting another instrument. A diameter-expanded hole can be easily formed.

  In FIG. 1 showing the execution sequence, in particular in step (1), the upper end of the central tube 2 of the vertical auger 1 is connected to a downward output shaft (14 in FIG. 2) of the reversible motor 3, and the motor 3 Is pivotally attached to the upper end of the telescopic boom 5 via a bracket 4 so as not to rotate. The lower end of the boom 5 is pivotally attached to a turntable (not shown) such as a 2-ton truck (supported by an outrigger) so that the boom 5 can be raised and lowered, and the operator sets the vertical control switch to “ON”. Rotating the auger rotation lever to “forward” or “reverse” and moving the boom vertical control lever to “down” or “up” allows the auger 1 to rotate forward and backward and up and down while holding the auger 1 in a vertical position. It can be controlled freely (vertical control by computer). That is, the movement of the boom 5 that is necessary for vertical driving can be automatically controlled by a computer. Such a residential ground improved vehicle GD-50A type is manufactured and sold by Aichi Corporation. In FIG. 1 (1), 6 is a hydraulic swivel, 7 is a digging blade, 8 is a digging blade mounting portion (guide pipe), and 9 is the ground on which a dry columnar body 10 (FIG. 1 (6)) is to be formed.

  In FIG. 2, which is an enlarged view of the auger 1 in FIG. 1 (1), the connecting shaft 12 connected to the upper end of the intermediate cylinder 2 has a pin hole 13, and is connected to the motor output shaft 14 fitted to the upper end of the connecting shaft. On the other hand, it is connected by a pin (not shown) penetrating the pin hole 13. The hydraulic swivel 6 is supported by the upper and lower flanges 15 so as to be rotatable only with respect to the intermediate cylinder 2, and the hydraulic hose guide 16 is connected to the truck hydraulic supply source via the two hydraulic supply pipes 17 and 18. Are connected to the two high-pressure hoses 19 and 20 in the central cylinder 2 through two annular grooves on the outer surface of the central cylinder 2 in a liquid-tight manner. Is connected to the entrances 23 and 24 of the excavating blade mounting portion (guide pipe) 8 in FIG. 2 in FIG. 2 is a sword tip for centering. The excavating blade 7 is fixed to the excavating blade mounting portion 8 as shown in FIG. 4, and the tip (lower end) 25a of the tip 25 occupies the center position of the excavating hole 26 as shown in FIG.

  In FIG. 3, cup-shaped expansion cylinders 29, 29 are fitted in a liquid-tight manner to a columnar body 28 fixed to the excavation blade mounting portion 8, and these expansion cylinders 29 are arranged on the inner surface of the excavation blade mounting portion 8. Is also fitted in a liquid-tight manner. 30 is a packing fixed to the expansion cylinder 29, and 31 is a chamber formed by an annular recess provided on the outer periphery of the main body 28, and communicates with the inlet / outlet 23 through a hydraulic hole 32 in the main body 28. Reference numeral 33 denotes a chamber formed by a recess on the bottom surface of the cup-shaped expansion cylinder 29 and communicates with the entrance / exit 24 through a hydraulic hole 34 in the main body 28. Reference numeral 35 denotes a bit integrated with the expansion cylinder 29. The excavation blade mounting portion 8 forms a hydraulic diameter expansion portion 11 in cooperation with an expansion cylinder 29 with a bit 35 and the like.

  When the pressure oil is supplied to the inlet / outlet 24 from the retracted state of the expansion cylinder in FIG. 3, the pressure oil is supplied to the chamber 33 through the hydraulic hole 34, and the expansion cylinder 29 and the bit 35 are in the diameter expansion positions of 29a and 35a in FIG. Project to Reference numeral 36 denotes an enlarged diameter portion.

Next, the enforcement process will be described. The auger 1 is disposed at a predetermined position in FIG. 1 (1), and the auger 1 is moved downward as shown in FIG. 38 is soil removal.
Next, as shown in FIG. 1 (3), a diameter-expanded hole 36 is formed at the bottom of the excavation hole 26. As shown in FIG. 4, the enlarged diameter hole portion 36 is obtained by raising the bit 35 by a predetermined height L1 while projecting to the enlarged diameter position 35a and rotating it. Similarly, the upper end enlarged diameter hole portion 36a is formed. At the same time, a cement-based solidifying agent is added to the soil 38.
Next, as shown in FIG. 1 (4), the auger 1 is lowered while rotating the auger 1 while inserting the waste soil 38 containing the solidifying agent into the excavation hole 26 (at this time, the soil in the hole rises), and then it is raised while being reversed. (At this time, the soil in the hole descends), and the raising and lowering of these is repeated, for example, 4 to 5 times to advance mixing and stirring.
Next, as shown in FIG. 1 (5), the lower end of the auger 1 is placed at the bottom of the well-excavated excavation hole 26 and is slowly raised while being reversed, thereby performing backfilling and rolling. Thus, a dry columnar body 10 as shown in FIG. 1 (6) is obtained. The columnar body 10 absorbs water from the surroundings in about 3 days and solidifies to become a complete columnar body. Thereby, the enlarged diameter part 10a formed in the enlarged diameter hole parts 36 and 36a contributes to the remarkable increase in an overload.

  Pipes may be employed instead of the high-pressure hoses 19 and 20 in FIG. 2, but the high-pressure hoses are effective because they are easily available, inexpensive, and easy to connect.

It is a front schematic diagram which shows an enforcement order. It is the elements on larger scale of FIG. It is the III-III cross-sectional enlarged view of FIG. It is the IV-IV arrow line view of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Auger 2 Center cylinder 3 Reversible motor 6 Hydraulic swivel 7 Excavation blade 8 Excavation blade attaching part 11 Hydraulic type enlarged diameter part 14 Output shaft 19, 20 Piping 26 Excavation hole 29 Expansion cylinder 36 Expansion diameter hole part

Claims (2)

A method for producing a dry columnar body of a foundation ground, wherein the upper end of the auger 1 is connected to the downward output shaft 14 of the reversible motor 3 supported so as not to rotate, and the excavating blade mounting portion 8 at the lower end of the auger is connected in the radial direction. A hydraulic diameter-expanding portion 11 projecting outward in opposite directions and a tip 25a, which is a sword tip for centering projecting downward from the center lower surface, are provided, and a pipe for supplying hydraulic pressure to the hydraulic diameter-expanding portion 11 is connected to a central cylinder of the auger The auger 1 is connected to the hydraulic swivel 6 at the upper end of the auger through the inside 2, and the enlarged hole portion 36 is excavated by the enlarged cylinder 29 of the hydraulic enlarged portion 11 in the excavated hole 26 excavated by the auger 1. The soil containing the solidifying agent is stirred by raising and lowering, and the lower end portion of the auger 1 is placed at the bottom of the excavation hole 26 filled with sufficiently stirred soil, and is slowly raised while being reversed. Characterized in that to perform the return roller compaction, dry columnar body manufacturing method of the foundation ground. The dry columnar body manufacturing method for a foundation ground according to claim 1, wherein the pipe is formed of a high-pressure hose.

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