JP2006265888A - Sand pile creating method and sand pile creating machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sand pile creating method which is carried out by reducing vibrations and noise, and achieves elimination of deviation of a sand pile driving location in a penetration initial stage, easy drawing of a hollow pipe, and smooth creation of a strong compaction sand pile with high quality, and to provide a sand pile creating machine. <P>SOLUTION: According to the sand pile creating method, a hollow excavating head 2 having a downward facing conical external surface 7, spiral blades 5 arranged on the external surface 7 in a manner ascending from a lower portion to an upper portion thereof, and excavating blades 3 protruding downward from a lower edge thereof, is attached to a lower end face of the sand pile creating hollow pipe 1 in a manner rotatable together with the same. Then upon rotation of the excavating head 2, soil is excavated by the excavating blades 3, and at least part of the excavated soil is successively conveyed to the upper portion of the external surface 7 by the spiral blades 5, followed by pressing the conveyed soil toward a hole wall 4a of an excavated hole 4 currently created, by the external surface 7, to thereby rigidly compact the hole wall 4a of the excavated hole 4. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a sand pile construction method and a sand pile construction machine for creating a sand pile on soft ground, and in particular, it is possible to create a sand pile without using a vibratory hammer (vibrator), and The present invention relates to a low vibration, low noise type sand pile construction method and a sand pile construction machine for constructing a firmly compacted sand pile.

  The present applicant previously disclosed in Japanese Patent Application Laid-Open No. 2001-32256 (Patent Document 1), as a method of penetrating the hollow tube into the soft ground, the hollow tube is moved by a hydraulic rotary drive without using a vibrator. A construction method (EGG method) was proposed to create sand piles with low vibration and noise by rotating in the circumferential direction.

This construction method includes a free-rolling molding roller that is eccentrically attached to the lower end of the hollow pipe, and when the hollow pipe is inserted, the excavation hole diameter is cut larger than the hollow pipe diameter by the roller to create a sand pile. It is.
Japanese Patent Laid-Open No. 2001-32256.

  In the invention described in Patent Document 1, since the roller which is a heavy object and the excavation bit at the tip of the roller are attached to be inclined with respect to the axis of the hollow tube, the hollow tube rotates in the circumferential direction. Below that, a miso slick movement (small turning movement) is performed. Therefore, at the initial stage of penetration of the hollow pipe, there is a problem that it is difficult to determine the sand pile formation position unless it is supported by a catch hawk or the like.

  Therefore, the low vibration and low noise type that eliminates the displacement of the sand pile placement position at the initial stage of intrusion, facilitates the pulling of the hollow tube, and enables smooth construction of high-quality and strong compacted sand piles. The technical problem which should be solved in order to provide the sand pile construction method of this and a sand pile production machine arises, and this invention aims at solving this subject.

  The present invention has been proposed in order to achieve the above-mentioned object, and the invention according to claim 1 is provided on the outer peripheral surface of the conical outer surface having a downward conical shape and rising upward from below. This is a construction method for creating a sand pile by attaching a hollow excavation head having a spiral tooth and a drilling tooth protruding downward from the lower end to the lower end of the hollow pipe for sand pile construction so as to be integrally rotatable. A step of excavating earth and sand with the excavating teeth by rotation of the excavating head, a step of sequentially sending at least a part of the earth and sand toward the upper portion of the outer peripheral surface by the spiral teeth, and the earth and sand that has been sent There is provided a sand pile construction method comprising a step of pressing the outer peripheral surface toward a hole wall of a drilling hole being created and firmly compacting the hole wall of the drilling hole.

  According to this method, the excavation head rotates integrally with the sand pile building hollow pipe, and the excavation teeth start excavating the earth and sand at that position, so the sand pile placement position at the initial stage of penetration of the hollow pipe No shift occurs. After the start of excavation, at least a part of the earth and sand excavated by the excavating teeth is sequentially sent toward the upper part of the outer peripheral surface of the excavating head by the spiral teeth. Therefore, the collected earth and sand are pressed against the hole wall of the excavation hole being created, and the hole wall of the excavation hole is firmly compacted.

  The invention according to claim 2 is a downwardly conical outer peripheral surface, a spiral tooth provided on the outer peripheral surface so as to rise upward from below, and an excavating tooth provided so as to protrude downward from the lower end. A hollow excavation head having a hollow pile for sand pile formation so as to be integrally rotatable. At least a part of the earth and sand excavated by the excavation tooth is used as the shape of the helical tooth. The excavation head is gradually pushed toward the hole wall side of the excavation hole that is being created. A sand pile construction machine configured as described above is provided.

  According to this configuration, the excavation head rotates integrally with the sand pile forming hollow pipe, and the excavation teeth start excavating the earth and sand at that position, so the sand pile placement position in the initial stage of penetration of the hollow pipe There will be no deviation. After the start of excavation, at least a part of the earth and sand excavated by the excavating teeth is sequentially sent to the upper part of the outer peripheral surface of the excavating head by the spiral teeth, and the earth and sand sent to the upper part of the outer peripheral surface is being constructed. The holes are sequentially pressed toward the hole wall of the excavation hole, and the hole wall of the excavation hole is firmly compacted.

  Invention of Claim 3 provides the sand pile formation machine of Claim 2 which formed the dimension of the outer diameter of the helical tooth attached to the outer peripheral surface of the said downward conical shape from the upper end to the substantially same dimension. .

  According to this configuration, since the outer diameter of the helical tooth attached to the outer circumferential surface (inclined surface) of the downward conical shape is formed with substantially the same dimension from the upper end to the lower end, it is substantially the same from top to bottom by the helical tooth. A hole with an inner diameter can be dug. In addition, the height of the spiral teeth gradually decreases from the lower end position to the upper end position, and accordingly, earth and sand sent to the upper end position side is also gradually pressed against the hole wall of the excavation hole, Firmly compacted.

  A fourth aspect of the present invention provides the sand pile forming machine according to the second or third aspect, wherein a plurality of the helical teeth are provided, and the excavating teeth are provided at the lower starting ends of the helical teeth.

  According to this configuration, since the earth and sand are dispersed by the plurality of spiral teeth and sent to the upper end side, the load applied to the spiral teeth is reduced, and the fatigue of the spiral teeth is reduced.

  A fifth aspect of the present invention provides the sand pile building machine according to the second, third or fourth aspect, wherein the excavation head is detachably provided to the hollow tube.

  According to this configuration, the excavation head can be used by simply exchanging it with one according to the excavation environment such as soil quality.

  According to the first aspect of the present invention, the excavation head rotates integrally with the sand pile forming hollow pipe, and the excavation teeth start excavating the earth and sand at that position. Excavation can be performed with high accuracy without causing a deviation in the installation position. After the start of excavation, at least a part of the earth and sand excavated by the excavating teeth is sequentially sent toward the upper part of the outer peripheral surface of the excavating head by the helical teeth.

  In this case, since the upper part of the outer peripheral surface of the excavation head is also formed with a downward conical shape, the width dimension between the outer peripheral surface and the hole wall becomes narrower in order, so the collected earth and sand are collected from the excavation hole being created. It is pressed toward the hole wall, and the hole wall of the excavation hole is firmly compacted. Thereby, the hollow tube can be easily pulled out, and a high-quality and strong compacted sand pile can be smoothly constructed. Further, since excavation can be performed only by rotating the excavation head and no exciter is used, low vibration and low noise are promoted, and efficient construction can be easily performed.

  When excavating using the sand pile forming machine of the invention according to claim 2, the excavation head rotates integrally with the sand pile forming hollow pipe, and the excavating teeth start excavation of earth and sand at that position. It is possible to excavate with high precision without using a catch hawk or the like without causing a displacement of the sand pile driving position in the initial stage of penetration of the hollow tube. After the start of excavation, at least a part of the earth and sand excavated by the excavating teeth is sequentially sent toward the upper part of the outer peripheral surface of the excavating head by the spiral teeth. Therefore, the collected earth and sand are pressed toward the hole wall of the excavation hole being created, and the hole wall of the excavation hole is firmly compacted.

  Thereby, the hollow tube can be easily pulled out, and a high-quality and strong compacted sand pile can be smoothly constructed. In addition, the construction of the excavation head is simple, and by simply rotating the excavation head, the hole wall surface can be compacted simultaneously with excavation, enabling highly efficient construction with low vibration and low noise. Become.

  In the invention according to claim 3, holes having substantially the same inner diameter can be excavated from the top to the bottom of the excavation hole by the helical teeth attached to the inclined surface of the downward-facing conical member, and the spiral is formed from the lower end position to the upper end position. Since the height of the teeth gradually decreases and the earth and sand sent to the upper end position side is gradually pressed against the hole wall of the excavation hole, the hole wall of the excavation hole is firmly compacted. In addition to the effects of the described invention, the hole wall of the excavation hole can be further compacted.

  In the invention according to claim 4, since the earth and sand are dispersed by a plurality of spiral teeth and sent to the upper end side to reduce the load applied to the spiral teeth, in addition to the effect of claim 2 or 3, Fatigue can be reduced and the life of the helical tooth can be improved.

  Since the invention according to claim 5 can be used by easily exchanging the excavation head according to the excavation environment such as soil quality, in addition to the effect of claim 2, 3 or 4, the quality is further improved. A strong compacted sand pile can be constructed smoothly.

  In order to achieve the purpose of eliminating the displacement of the sand pile placement position at the initial stage of penetration, easily pulling out the hollow tube, and achieving high quality and strong compaction, A hollow excavation head having a spiral tooth provided on the outer peripheral surface so as to rise upward from below and an excavation tooth provided so as to protrude downward from the lower end is formed into a hollow pipe for sand pile formation. It is attached to the lower end of the slab so as to be integrally rotatable, and the earth and sand is excavated by the excavating teeth by the rotation of the excavating head, and at least a part of the earth and sand is sequentially sent toward the upper part of the outer peripheral surface by the helical teeth A sand pile construction method and a sand pile creation machine capable of pressing the earth and sand against the hole wall of the excavation hole being created by the outer peripheral surface and firmly compacting the hole wall of the excavation hole are provided.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
Drawing 1 is a key map showing an example of the sand pile construction method of the present invention. In FIG. 1, the outline of the sand pile construction method will be described. A drilling head 2 is attached to the lower end of the sand pile construction hollow tube 1 so as to be integrally rotatable, and a drive motor (not shown) is installed above. is doing. The sand pile building hollow pipe 1 is rotated in the circumferential direction together with the excavation head 2 by the drive of the drive motor, and the excavation teeth 3 provided at the lower end of the excavation head 2 by this rotation are formed in the holes 4 (hereinafter, “ Excavation hole 4 ").

  The earth and sand excavated by the excavating teeth 3 are gradually sent upward by the helical teeth 5 provided on the outer circumferential surface (inclined surface) 7 having a downward conical shape, and above the outer circumferential surface 7. It is pressed against the hole wall 4a of the excavation hole 4, and the surface of the hole wall 4a is firmly compacted with this earth and sand. Accordingly, the excavation hole 4 is not constricted, and the sand pile building hollow tube 1 can be easily pulled out, and a high-quality and strong compacted sand pile can be smoothly applied. Moreover, since a vibro hammer is unnecessary and only the excavation head 2 is rotated, construction with low vibration and low noise becomes possible.

  FIGS. 2 to 4 show the detailed structure of the excavation head 2 in the sand pile making machine used in the sand pile making method. 2 is a side view of the excavation head 2, FIG. 3 is a bottom view of the excavation head 2, and FIG. 4 is a side view of the excavation head 2 with a part thereof broken to show the internal structure.

  As shown in FIG. 4, the excavation head 2 that rotates integrally with the sand pile forming hollow tube 1 is a hollow tubular body. A connecting portion 6 is provided at the upper portion of the excavation head 2, and this connecting portion 6 is detachably attached to the lower end portion of the sand pile forming hollow tube 1, and the internal hollow path is the sand pile forming hollow tube 1. It is provided in a state where it communicates with the hollow passage inside. Thereby, the pile material for sand piles sent through the inside of the hollow pipe 1 for sand pile formation is supplied from the lower part of the excavation head 2 into the excavation hole 4.

  As shown in FIGS. 2 and 4, the outer circumference of the excavation head 2 is provided with a downwardly conical shape, that is, an outer circumferential surface 7 whose outer diameter gradually increases from the lower side to the upper side, and a lower end on the outer circumferential surface 7. Two spiral teeth 5 (hereinafter referred to as “spiral teeth 5”) rising from the top toward the upper end are provided. As shown in FIG. 3, the starting ends of the helical teeth 5 attached to the inclined surface on the outer periphery on the lower end side of the excavation head 2 are shifted by about 180 degrees in the circumferential direction, and 2 at the lower starting end of each helical tooth 5. Two excavating teeth 3 and 3 are provided to be inclined downward in the forward rotation direction.

  Similarly, as shown in FIGS. 2 and 4, the outer diameter of the helical tooth 5 is almost the same from the lower end to the upper end. Therefore, the distance from the outer peripheral surface 7 to the cutting edge of the helical tooth 5 gradually decreases as the outer peripheral surface 7 has a conical shape as it proceeds from the lower end to the upper end side.

  Next, the operation of the excavation head 2 will be described. When the excavation head 2 is pressed against the ground integrally with the sand pile forming hollow tube 1 and rotated forward, the excavation teeth 3 excavate and excavation holes 4 are formed. Most of the earth and sand excavated by the excavating teeth 3 is sequentially sent from below to above by the helical teeth 5.

  When the excavation head 2 is almost in the excavation hole 4, the upper part of the excavation hole 4 is closed by the excavation head 2, and the earth and sand sent upward from below by the helical teeth 5 disappears. For this reason, the earth and sand having no place to go is pressed toward the hole wall 4a of the excavation hole 4 being created at the upper portion 7a of the outer peripheral surface 7, and the hole wall 4a is compacted by the pressed earth and sand.

  Moreover, due to the inclination of the outer peripheral surface 7, the force toward the hole wall 4 a is gradually increased and finally becomes considerably strong. In addition, since the spiral teeth 5 are provided in two strips (A) and (B), the earth and sand sent upward are respectively dispersed in the two spiral teeth 5 to reduce the load applied to each spiral tooth 5. Further, the compaction efficiency is improved as compared with the case where one spiral tooth 5 is provided.

  When the excavation is finished, the pile material supplied from the lower side of the excavation head 2 is left in the excavation hole 4, and the sand pile forming hollow pipe 1 is pulled out together with the excavation head 2. In this extraction, since the hole wall 4a of the excavation hole 4 is already firmly compacted, the hole wall 4a of the excavation hole 4 is not collapsed and becomes narrowed, and can be easily extracted while constructing the sand pile. Can do.

  Thus, the compacted sand that has been expanded to a predetermined diameter size by repeatedly pulling out and pushing back (re-penetrating) the hollow tube 1 and forming the hollow tube 1 while pulling it up step by step. Pile can be continuously created efficiently.

  In the embodiment, two spiral teeth 5 are provided, but one or three or more can be provided if necessary.

  It should be noted that the present invention can be variously modified without departing from the spirit of the present invention, and the present invention naturally extends to the modified ones.

The conceptual diagram which shows an example of the sand pile construction method of this invention. The side view of the excavation head in the sand pile construction machine used for the sand pile construction method of this invention. The bottom view of a digging head same as the above. The side view which fractures | ruptures a part of excavation head same as the above and shows an internal structure.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Sand pile hollow tube 2 Excavation head 3 Excavation tooth 4 Excavation hole 4a Hole wall 5 Spiral tooth 6 Connection part 7 Outer surface

Claims (5)

  A hollow excavation head having a downward conical outer peripheral surface, a helical tooth provided on the outer peripheral surface so as to rise upward from below, and an excavating tooth provided so as to protrude downward from the lower end. , A method of constructing a sand pile by being attached to the lower end of a hollow pipe for sand pile construction so as to be integrally rotatable, the step of excavating the earth and sand with the excavating teeth by the rotation of the excavation head, and at least a part of the earth and sand Are sequentially sent toward the upper part of the outer peripheral surface by the spiral teeth, and the earth and sand sent are pressed against the hole wall of the excavation hole being created by the outer peripheral surface, thereby strengthening the hole wall of the excavation hole. A sand pile construction method characterized by comprising a step of compacting the sand pile.   A hollow excavation head having a downward conical outer peripheral surface, a helical tooth provided on the outer peripheral surface so as to rise upward from below, and an excavating tooth provided so as to protrude downward from the lower end. The spiral tooth is attached to the lower end of the sand pile forming hollow pipe so as to be integrally rotatable. At least a part of the earth and sand excavated by the excavating teeth is sequentially directed toward the upper outer peripheral surface of the excavating head. The upper part of the outer peripheral surface of the excavation head is configured to gradually press the earth and sand sent by the spiral teeth toward the hole wall side of the excavation hole being created. A unique sand pile generator.   The sand pile creation machine of Claim 2 which formed the dimension of the outer diameter of the helical tooth attached to the outer peripheral surface of the said downward conical shape from the upper end to the substantially same dimension.   The sand pile building machine according to claim 2 or 3, wherein a plurality of the spiral teeth are provided, and the excavation teeth are provided at a lower starting end of each spiral tooth. The sand pile creation machine according to claim 2, 3 or 4, wherein the excavation head is detachably attached to the hollow tube.

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