JP3684533B2 - Low vibration and low noise sand pile construction method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for constructing a sand pile that is greatly expanded in diameter and lower than that of a hollow pipe for sand pile construction with low vibration and noise.
[0002]
[Prior art]
The present applicant previously disclosed in JP-A-2001-32256, as a method of penetrating the hollow tube into the soft ground, without using a vibrator (vibro hammer), the hollow tube is moved to its circular shape by a hydraulic rotary drive. A construction method for sand piles with low vibration and noise by rotating in the circumferential direction was proposed.
[0003]
In this construction method, a free-rolling molding roller that is eccentrically attached to the lower end of the hollow tube is provided, and when the hollow tube penetrates, the drilling hole diameter is cut larger than the hollow tube diameter to create a sand pile. Since the roller and the excavation bit at the tip of the roller are attached to be inclined with respect to the axis of the hollow tube, when the hollow tube rotates in the circumferential direction, miso-scrubbing motion (small Therefore, there is a problem that the position of the sand pile is not determined at the initial stage of penetration of the hollow pipe, and the same movement occurs at the final drawing stage of the hollow pipe, resulting in stable quality. In some cases, sand piles could not be constructed.
[0004]
Furthermore, the earth and sand excavated when the hollow pipe penetrates is laterally compressed and compacted by the eccentric forming roller. However, in the soft ground, some of the excavation holes collapse and collapse over time. As a result, earth and sand are accumulated on the upper side of the molding roller, and it may be difficult to perform the drawing operation in the sand pile formation process.
[0005]
[Problems to be solved by the invention]
The present invention is an improvement of the above-described method, and excavation of the hollow pipe provided with an eccentric roller at the lower end does not occur in the sand pile driving position at the initial stage of penetration, and is excavated when the hollow pipe is penetrated. Even when the hole is constricted, collapsed, or collapsed, the hollow tube can be easily pulled out, and the high-quality and strong compacted sand pile with a large diameter can be smoothly constructed. It proposes a sand pile construction method of noise.
[0006]
[Means for Solving the Problems]
In the present invention, a spiral tooth is attached to the outer peripheral surface of the hollow tube, and a catch hawk that can be opened and closed in the horizontal direction is attached to the lower part of the leader that suspends the hollow tube so that it can be moved up and down. It is configured so that it can be held. Then, in the initial stage of penetration of the hollow tube into the soft ground, the catch hawk is swung in the closing direction to hold the helical teeth, and the displacement of the placement position due to the miso-scrubbing movement of the lower end of the hollow tube is prevented. To prevent.
[0007]
In addition, when the hollow pipe is pulled out in the sand pile formation process after the drilling bit and the molding roller have opened a drilling hole with a diameter larger than the hollow pipe along with the rotation penetration of the hollow pipe, it is formed at the time of penetration. Even when the excavated hole is constricted over time or partly collapsed and sediment is deposited in the gap between the hollow tube above the molding roller and the excavated hole, the spiral teeth formed above the roller are The crushed earth and sand can enter into the gap formed by the eccentricity of the molding roller, and the roller can be efficiently moved and compacted laterally by the roller. It is greatly reduced and drawing becomes easy.
Hereinafter, embodiments of the method of the present invention will be described with reference to the drawings.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is an explanatory view of the lower half of a sand pile building hollow pipe used in the method of the present invention. This hollow pipe 1 is aligned in the circumferential direction by a drive motor (not shown) installed above. It is configured to be rotatable in the reverse direction.
[0009]
A sand discharge pipe 2 is attached to the lower end of the hollow pipe 1 downward, and communicates with the hollow pipe 1. The sand discharge pipe 2 has a diameter smaller than that of the hollow pipe 1 and is arranged at the axial center of the hollow pipe 1. In contrast, the excavation bit 3 is further downwardly arranged at the lower end of the discharge pipe 2 so as to bend to one side, and a part or all of the excavation bit 3 is moved to the opposite side to the inclined side of the discharge pipe 2. Is fixed so as to protrude outward from the hollow tube 1.
[0010]
Denoted at 4 is a downwardly truncated cone-shaped molding roller that is rotatably supported on the outer periphery of the sand discharge pipe 2. The roller 4 bulges outward from the hollow pipe 1, and the hollow pipe 1 is in its circumferential direction. , The lower end roller 4 rotates eccentrically with the sand discharge pipe 2 and slips or rotates in the opposite direction to the hollow pipe 1 in the soft ground due to its frictional resistance.
[0011]
Reference numeral 5 denotes a helical tooth having a predetermined pitch that is attached to the outer peripheral surface of the hollow tube 1 and is arranged so that the height of the tooth is slightly inside the outermost rotational locus of the molding roller 4. The length of the hollow tube 1 in the axial direction is about 1/3 to 1/5 of the entire length of the hollow tube 1.
[0012]
6 is a catch hawk which is attached to the lower part of a leader (not shown) of a sand pile forming device that suspends the hollow tube 1 so as to be movable up and down, and is horizontally swiveled by a cylinder drive so as to approach and separate from each other (see FIG. 2 to 3), the helical tooth 5 portion of the hollow tube 1 can be held with some play, and the inner side surface of the hollow tube 1 can be easily moved up and down when the helical tooth 5 is held. Therefore, it is made of a slippery material such as nylon. Reference numeral 7 denotes two holding arms constituting the catch hawk 6.
[0013]
Thus, when the hollow tube 1 is first penetrated into the soft ground 8, the hollow tube 1 is rotated forward, and the catch hawk 6 is closed and the spiral tooth 5 is held in the initial stage of penetration. This prevents miso-scrubbing movement at the lower end of the hollow tube 1 (FIG. 4).
When the penetration of the hollow tube 1 progresses and the hollow tube 1 on the ground part no longer moves to the taste mash, the catch hawk 6 is opened to hold the hollow tube 1 in order to prevent any damage. The hollow tube 1 is rotated and penetrated to a predetermined depth (see FIG. 5).
[0014]
In the process of rotationally penetrating the hollow tube 1, the excavated soil is taken in by the bit 3, moved to the side by the forming roller 4, and compacted, and the diameter of the hollow tube 1 is larger than that of the hollow tube 1 while holding the through hole 9. The penetration hole 9 having a solid hole wall is cut away.
[0015]
In addition, at the stage of penetration (excluding re-penetration), the helical tooth 5 located inside the rotation locus of the molding roller 4 does not make a special contribution to the penetration of the hollow tube 1.
[0016]
When the hollow tube 1 reaches the design depth as described above, a predetermined amount of sand is put into the hollow tube 1 and this time, the hollow tube 1 is rotated in the reverse direction, and at the same time compressed air is introduced into the tube 1. The hollow pipe 1 is pulled out to a predetermined height in the ground 8 while being blown, and the sand is discharged from the lower end of the discharge pipe 2, and the discharged sand is filled into the through hole 9 cut below the discharge pipe 2 (FIG. 6).
[0017]
Next, the inside of the hollow tube 1 is kept in a pressurized state, and penetrates again to a predetermined height while maintaining reverse rotation (FIG. 7). By this re-penetration, the sand immediately below is crushed and compacted, and at the same time, the sand is expanded outward and expanded in diameter, and pressed by the molding roller 4 toward the vicinity thereof, thereby expanding the diameter of the sand pile 10 being formed. And compaction is performed.
[0018]
In this construction method in which the helical tooth 5 is attached to the hollow tube 1, unlike the method disclosed in Japanese Patent Application Laid-Open No. 2001-32256, the hollow tube 1 is re-penetrated in the same manner as when the hollow tube 1 is pulled out. Continue reverse rotation of. This is because if the hollow tube 1 is returned to the normal rotation, if the hole wall of the penetration hole 9 collapses, the normal rotation causes the collapsed soil to move upward (the discharge direction). This is because by maintaining the rotation, the fallen soil is moved downward while being crushed by the spiral teeth 5, and when the hollow tube 1 is pulled out, it is pressed against the hole wall again by the molding roller 4 so that the hole wall is compacted. .
[0019]
Next, when the deepest part of the sand pile 10 that has been compacted and expanded to a predetermined diameter is formed, the sand is supplied again into the hollow tube 1 and the hollow tube 1 is pulled out to a predetermined height while rotating in the reverse direction. At the same time, the hole 9 that has been cut out is filled while discharging sand from below, and then the hollow tube 1 is re-penetrated by the same operation as described above (FIGS. 8 to 9).
[0020]
In this way, the hollow tube 1 is pulled out from the soft ground 8 step by step while repeating the drawing and re-penetrating operation of the hollow tube 1 while maintaining the reverse rotation. In addition, as the pile head of the sand pile 10 under construction approaches the ground surface, the lower part of the hollow tube 1 causes the miso kneading movement again in the same manner as at the start of the penetration of the hollow tube 1. The catch hawk 6 is closed, the helix 5 that has come out of the head on the ground surface is held, and the state is maintained until the sand pile 10 is completed, and the horizontal displacement of the hollow tube 1 is prevented. (FIGS. 8-10).
[0021]
【The invention's effect】
The sand pile construction method of the present invention is as described above and has the following effects.
(1) A high-quality sand pile that is larger in diameter than the hollow tube and firmly compacted in the vertical and lateral directions by a drilling bit at the lower end protruding outward from the hollow tube for sand pile construction and an eccentric molding roller. Can be efficiently constructed with low vibration and low noise, and the wall of the penetration hole that was opened when the hollow pipe penetrated is compacted, so it is highly self-supporting, and it is combined with the sand pile that has been created. And a strong ground is formed.
[0022]
(2) By providing spiral teeth on the lower outer periphery of the hollow tube, even if a part of the cut through hole becomes narrowed or collapses over time, the soil or The collapsed soil is moved downward while being crushed by the spiral teeth, and pressed against the hole wall of the penetration hole with the molding roller and compacted. As in the conventional method, earth and sand are accumulated on the upper side of the molding roller, and the hollow tube is pulled out. The hollow tube can be pulled out smoothly without causing the problem that it becomes impossible to operate, and the hollow tube maintains the reverse rotation operation until the completion of sand pile construction after the penetration hole has been drilled. As described above, etc. always move downward and are used for compaction of the hole wall, so that they are not discharged to the ground surface.
[0023]
(3) Due to the presence of a heavy-weight molding roller provided eccentrically at the lower end, the miso-scrubbing motion of the rotating hollow tube that occurs in the initial stage of penetration of the hollow tube and the final stage of drawing Since it is prevented by holding by the catch hawk, the sand pile driving position is not displaced, and a stable sand pile with good quality from the beginning to the end can be created.
[Brief description of the drawings]
BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is an explanatory side view showing a lower half portion of a sand pile building hollow pipe used in the method of the present invention and a catch hawk.
FIG. 2 is a front explanatory view showing a state in which the catch hawk is closed and holding the helical tooth portion of the hollow tube.
FIG. 3 is a front explanatory view showing a state where the catch hawk is opened and the holding of the hollow tube is released.
FIG. 4 is an explanatory view showing a process in which the sand pile forming method according to the present invention is implemented, and shows a state in which the hollow tube has started to penetrate into the soft ground.
FIG. 5 is an explanatory view showing a process in which the sand pile creation method according to the present invention is implemented, and shows a state where penetration to a design depth is completed.
FIG. 6 is an explanatory view showing a process in which the sand pile forming method according to the present invention is being implemented, and shows a state in which the drawing of the hollow tube is started.
FIG. 7 is an explanatory view showing a process of carrying out the sand pile forming method according to the present invention, and showing a state where the hollow pipe is re-penetrated to a predetermined height.
FIG. 8 is an explanatory view showing a process of carrying out the sand pile forming method according to the present invention, and shows a state in which the hollow tube is pulled out again to a predetermined height.
FIG. 9 is an explanatory view showing a process of carrying out the sand pile forming method according to the present invention, and shows a state where the hollow pipe is re-penetrated to a predetermined height again.
FIG. 10 is an explanatory diagram showing a process in which the sand pile creation method according to the present invention is implemented, and shows a state where sand pile creation is completed.
[Explanation of symbols]
1-Hollow for sand pile formation 2-Inclined sand discharge pipe 3-Excavation bit 4-Forming roller 5-Spiral tooth 6-Catch hawk 7-Holding arm 8-Soft ground 9-Penetration hole 10-Formation sand pile

Claims (2)

  The sand pile forming hollow pipe is configured to be rotatable forward and backward in its circumferential direction, and a sand discharge pipe bent in one direction with respect to the hollow pipe is connected to the lower end of the hollow pipe. A molding roller is mounted on the outer periphery of the discharge pipe so as to be freely rotatable. A drilling bit is fixed to one lower end of the discharge pipe, and an outermost outer surface of the molding roller is provided on a lower outer peripheral surface of the hollow pipe. Using a sand pile forming device to which spiral teeth formed on the inner side of the rotation trajectory are attached, and when the hollow pipe penetrates into the soft ground, the excavated soil is excavated by rotating the hollow pipe. Take in with a bit, move to the side with a molding roller, compact and hold down to hold the penetration hole, open a larger diameter penetration hole than the hollow pipe, and when pulling out the hollow pipe, A predetermined amount of sand is put into the hollow tube, and the hollow tube is pulled out to a predetermined height while blowing compressed air. The sand in the hollow pipe is discharged from the discharge pipe, filled into the cut hole below the discharge pipe, then penetrated again to a predetermined height, and rolled to the side and downward by a forming roller to form a sand pile. A compacted sand pile that has been expanded to a predetermined diameter by expanding the diameter and compressing and compressing downward and laterally, repeating the drawing and re-penetration of the hollow pipe, and drawing the hollow pipe in stages. In the initial stage of penetrating the hollow tube into the soft ground and the final stage of pulling out the hollow pipe from the penetrating hole, the lower part of the leader that lifts and lowers the hollow pipe is lifted. The spiral teeth are held by the attached horizontally openable and closable catch hawk, except for the initial stage of penetration of the hollow tube and the final stage of extraction, the catch hawk is opened to release the spiral teeth. Intrusion in the process of compacting sand piles The soil or collapsed soil of the constricted portion due to the collapsed state or collapse is moved downward while being crushed by the spiral teeth rotating together with the hollow tube, and pressed against the hole wall of the penetration hole by the molding roller and compacted. A low vibration and low noise sand pile construction method characterized by that.   The low vibration according to claim 1, wherein the hollow tube is rotated in a direction opposite to that at the time of drilling the penetration hole after the penetration hole is cut, through the whole process of drawing and re-penetrating the hollow pipe in the sand pile formation process. , Low noise sand pile construction method.

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