JP2005146676A - Apparatus for constructing dry columnar body in foundation ground - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus for constructing a dry columnar body in a foundation ground, which not only carries out excavation, agitation, and rolling by its auger but also facilitates formation of a reamed hole section in an excavated hole at a desired location without drawing up the auger or insertion of another instrument, by virtue of provision of a hydraulic diameter-increasing section for the auger per se. <P>SOLUTION: The apparatus for constructing the dry columnar body in the foundation ground is formed such that the auger is vertically connected via its upper end to a downward directed output shaft of a non-rotatably supported reversible motor, and that the hydraulic diameter-increasing section protruding in a radial outward direction is arranged on an excavating blade mounting portion at a lower end of the auger. Then a pipe for feeding oil pressure to the hydraulic diameter-increasing section is inserted into a central cylinder and connected to a hydraulic swivel at the upper end of the auger, and therefore the reamed hole section is excavated in the hole excavated by the auger, by an expanded cylinder at the hydraulic diameter-increasing section. Herein the pipe can be formed of a high-pressure hose. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a dry columnar body manufacturing apparatus for 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, devices (Patent Documents 1 and 2) in which an auger is mounted with an enlarged blade that protrudes in the radial direction by friction with the inner wall of the excavation hole during reverse rotation have been proposed.
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.

  According to the first aspect of the present invention, the upper end portion of the auger that is perpendicular to the downward output shaft of the reversible motor that is supported so as not to rotate is connected, and the hydraulic diameter expansion that protrudes radially outward to the excavation blade mounting portion at the lower end of the auger A pipe for supplying hydraulic pressure to the hydraulic diameter expansion section is connected to the hydraulic swivel at the upper end of the auger through the center tube of the auger, and the expansion hole of the hydraulic diameter expansion section is connected to the excavation hole drilled by the auger. It is a dry columnar body manufacturing apparatus for a foundation ground, characterized by excavating an enlarged hole portion.

  Invention of Claim 2 is a dry-type columnar body manufacturing apparatus 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 excavation 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 concave portion 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 pressure oil is supplied to the inlet / outlet 24 from the expansion cylinder retracted state 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 a soil removal.
Next, as shown in FIG. 1 (3), an enlarged diameter hole portion 36 is formed at the bottom of the excavation hole 26. As shown in FIG. 4, the diameter-expanded hole portion 36 is obtained by raising the bit 35 by a predetermined height L1 while protruding and rotating the bit 35 to the diameter-expanded position 35a. 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 in place 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)

  The upper end of the auger, which is perpendicular to the downward output shaft of the reversible motor supported so as not to rotate, is connected, and the excavating blade mounting part at the lower end of the auger is provided with a hydraulic enlarged part that protrudes radially outward. Piping that supplies hydraulic pressure to the diameter part is connected to the hydraulic swivel at the upper end of the auger through the center tube of the auger, and the diameter expansion hole part is excavated by the expansion cylinder of the hydraulic diameter expansion part in the excavation hole excavated by the auger A dry columnar body manufacturing apparatus for foundation ground, characterized in that The dry columnar body manufacturing apparatus for foundation ground according to claim 1, wherein the pipe is formed of a high-pressure hose.

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