JP3706464B2 - Auger device and rooting method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a mechanism of an expansion bit and a rooting method for use in a method of sinking a pile by a hollow digging method using a hollow pile and creating a rooting bulb below the pile.
[0002]
[Prior art]
There is a medium digging method in which a spiral auger is inserted into a hollow pile, the ground is excavated with the tip of the auger drill, the soil is pulled up and discharged through the hollow hole of the pile by the spiral auger, and the pile is set in the ground. Are known. In addition, there is a consolidation method in which a bottom expanding portion is formed in the ground below the lower end of the pile using a medium digging method, and an expanded bulb for root consolidation is formed here to form a support pile.
[0003]
FIG. 20 is an explanatory view for explaining the underground digging technique for hollow piles. As shown in FIG. 20, the hollow pile 100 is suspended by the suspended mast 102 of the pile driving machine 101 of the digging method and submerged in the ground. The auger drill 103 inserted into the hollow pile 100 receives rotational power from the driving device 104, the excavation blade 105 excavates the underground 106, and the auger screw 107 raises the excavated soil and discharges it from the upper part of the hollow pile 100. To do. With this excavation, the hollow pile 100 sinks into the ground. When the hollow pile reaches the support ground in the ground, the ground soil and cement are stirred and mixed below the hollow pile to form an expanded bulb. This enlarged bulb can be fixed to the lower end of the hollow pile to construct a pile having a large bearing capacity.
[0004]
In this rooting method, it is necessary to use a bottom expansion bit in order to form an excavation part having a diameter larger than the inner diameter of the pile below the pile. Conventionally, various types of such widened bits have been developed.
In Japanese Utility Model Publication No. 63-23506, a pair of divided spiral blades are provided on a bottomed cylindrical main body provided with a plurality of jets connected to a cavity, and the outer periphery of the main body of the divided portion of the spiral blades is provided. The upper and lower stoppers are provided on the pair of regulating plates directed in the tangential direction, and the pair of enlarged bits regulated by the upper and lower stoppers are pivotally attached to the main body via pins, and the enlarged bits are expanded by earth pressure resistance. It is regulated by a stopper, and by releasing this earth pressure resistance, it can be expanded and contracted in the main body so as to get over the lower stopper and reduce the diameter, and the radial direction of the main body within the range of the gap between the pivot part and the pin head An expansion auger head of a medium digging method that is slightly swung with respect to the above is disclosed.
[0005]
[Problems to be solved by the invention]
In the prior art, an enlarged blade is stored in the diameter of the spiral blade of the auger. When this enlarged blade is projected downward from the lower end of the hollow pile, the enlarged blade causes a reaction force in the expansion direction due to the resistance of the surrounding earth and sand. It is a structure that expects the enlarged blade to expand by this reaction force. In such a conventional technique, there is a possibility that the enlarged blade housed in a diameter smaller than the diameter of the screw blade is solidified by the soil compacted in the screw blade and does not open. Further, the enlarged magnifying knife may be shrunk due to earth and sand resistance when the screw is moved up and down.
[0006]
The object of the present invention is to provide an auger apparatus and a rooting method that solve such problems, and the problems of the present invention are as follows.
a. To realize an enlarged wing that reliably expands to an outer diameter that is larger than the outer diameter of the pile, so that it can be held in an enlarged state, and an enlarged bulb can be reliably created.
b. Providing an excavating tool with good excavability for the rooting method, that is, excavating at the time of diameter reduction is excellent, diameter expansion can be realized reliably, and the axial excavation performance remains as it is. Be good.
[0007]
c. To improve the adhesion between the inner surface of the hollow pile and the rooted bulb, and to integrate the bulb and the pile.
[0008]
[Means for Solving the Problems]
The present invention has been made to solve the above-mentioned problems, and as a technical means thereof, in an auger apparatus for substituting a hollow pile into the ground by using a medium digging method to create a rooted bulb, a blade mounting arm of an enlarged wing A swinging kicking member that kicks the side of the blade is attached to the cutter shaft, and a protrusion that presses and swings the other end of the swinging kicking member is provided on the auger shaft. and spline connection provided with a clearance, only the circumferential gap amount when the reverse rotation of the o Ga shaft cutter shaft and auger shaft is relative rotation, the projections kicking one end of the kick-out member, the kick member the other end kicking the base of the expansion blades, to provide a auger system being characterized in that so as to forcibly swing the expanded wings magnification direction.
[0009]
This auger device is provided with a spline connection having a play (circumferential clearance) in the circumferential direction, and when the auger shaft is rotated in the reverse direction, the auger shaft and the cutter shaft due to the play (circumferential clearance) are relative to each other. The kicking member was forcibly swung by the idle rotation to reliably kick out the enlarged wing. Therefore, the diameter of the expanding blade is surely expanded, and the uncertainties inherent in the other force as in the prior art are eliminated. Further, as long as the rotation is reverse, the diameter of the expanding blade is reliably maintained.
[0010]
Further, the shape of the blade mounting arm of the expansion wing is a spiral blade shape in the same spiral direction as the auger screw. The enlarged wings have a reduced diameter when the auger is rotating forward, and the outer diameter of the cutting edge is almost equal to the outer diameter of the screw, so that excavation is not performed. Accordingly, at this stage, the blade mounting arm is formed in a spiral shape so as to perform the same action as an auger screw that raises the soil. This spiral shape of the blade mounting arm has the advantage of lowering the stirring mixture of the root hardening layer downward when forming an enlarged bulb while expanding and rotating in reverse, which will be described later, and has the advantage of increasing the stirring effect.
[0011]
A brush that cleans the inner surface of the hollow pile is attached to the auger shaft that is externally fitted to the cutter shaft, and the inner surface of the hollow pile is cleaned to ensure adhesion between the inner surface and the enlarged bulb. The inner surface of the hollow pile is usually provided with a circumferential projection to improve the contact with the bulb, but the earth and sand during excavation adhere to the corners of this circumferential projection and the adhesion performance is impaired. There is a fear. In the present invention, this problem is solved because the inner surface of the hollow pile is cleaned with a brush in the bulb formation process.
[0012]
The brush is attached when the base portion of the brush is fitted and fixed to the outer peripheral portion of the auger shaft to be fitted from the outside in the radial direction so that the brush wire extends outward in the radial direction. It is easy to remove, and the cleaning effect can be demonstrated both in the auger forward and reverse rotation.
Another way to install the brush is to connect one end of the base plate of the brush to the outer peripheral surface of the auger shaft with a pin parallel to the auger shaft so that it can swing, and has a stopper that restricts the movement of the other end of the base plate The brush wire may have a structure extending radially outward. With this structure, when the auger is rotating forward, the brush action is small and wear of the brush is reduced. When the auger is reversed, the brush is urged in the direction of expanding the diameter by friction with the inner surface of the hollow pile, and the cleaning effect is increased.
[0013]
The brush may have a structure in which a brush base is attached to a plate suspended from the lower surface of the screw blade and a brush wire is extended radially outward. There are few restrictions of an attachment part, attachment and removal, adjustment of a brush effect, etc. are easy, and it can be set as the brush of appropriate performance.
The present invention can form a high quality bulb most efficiently using the auger device described above. In this method, the hollow pile is submerged in the ground by the digging method, and after the lower end reaches the rooting layer, the auger device is used to move the expanding wing downward from the lower end of the hollow pile to the lower end of the rooting bulb. Projection, reverse rotation of the auger to expand the expansion wing, inject cement milk, raise and lower the root consolidation layer while expanding the expansion wing, and create a bulb Is the method. At this time, the blade mounting arm of the magnifying wing operates in the same manner as the auger screw. Further, the blade tip of the enlarged wing is mounted on the upper side of the blade attachment arm so as to excavate the formation when the enlarged wing is pulled up.
[0014]
The shape of the magnifying wing is formed as described above. When the magnifying wing is moved up and down by reverse excavation operation, the material of the natural ground in the bulb formation part and the hardener such as cement can be mixed and stirred efficiently. . The screw has a large effect of feeding the mixture downward by reversal, has a large mixing and stirring effect, and can obtain a high quality, high strength, uniformly mixed bulb forming material. This bulb construction material is a mixture of soil and sand of the bulb construction layer and cement milk.
[0015]
The expansion wing is drilled for diameter expansion by reverse rotation of the auger, and the stir layer is moved up and down to stir, but diameter expansion is performed by reverse rotation of the auger, diameter reduction is performed by forward rotation of the auger, and forward and reverse rotation is repeated The root hardening layer can also be stirred.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a side view showing the entire blade of the auger apparatus of the embodiment, and FIG. 2 is a side view of FIG. 1 rotated 90 degrees around the axis. In addition, the enlarged wing | blade has shown the state which expanded the diameter in FIG. 1, and the state reduced in diameter in FIG.
[0017]
The blade shaft 1 has a straight blade (single sword) 2 at the lower end, an excavation blade bit 3 above it, and an enlarged blade 4 above it. The cutter shaft 1 is attached to the auger shaft 11 by spline coupling. The auger shaft 11 is attached to the tip of the cutter shaft 1 and inserted into the hollow pile. In the pile settlement process, the straight blade 2 and the excavation blade bit 3 excavate the formation below the hollow pile, and the screw 12 removes the excavated soil from the hollow pile. It is discharged through the inside, and hollow piles are sunk in the ground to a predetermined depth by the digging method. At this time, the auger device is rotating forward (right rotation). The expansion wing 4 is in a contracted state.
[0018]
The expansion blade 4 expands in diameter by left rotation (reverse rotation) and decreases in diameter by right rotation (forward rotation). When the diameter is reduced by clockwise rotation (forward rotation), it fits in the hollow pile. At this time, the excavation blade bit 3 excavates with a diameter equivalent to the inner diameter of the hollow pile.
FIG. 3 is a view taken along the line A-A in FIG. 1 and shows a state in which the enlarged blade 4 is enlarged in diameter and the blade tip is inscribed in the enlarged circle 47. FIG. 4 is a diagram in which the enlarged blade 4 is reduced in diameter and the blade tip is reduced. A state inscribed in 46 is shown.
[0019]
When expanding the diameter of the expansion blade, the swinging kicking member 5 operates. As shown in FIGS. 1 and 2, the swinging kick member 5 has a lever shape, and a substantially central portion thereof is pin-supported by a swing kicking member support portion 6, and can swing freely around this pin. It has become. As shown in FIG. 4, the lower end of the swinging kicking member 5 kicks out the side surface of the blade mounting arm 42 of the expanding blade 4, and the upper end of the swinging kicking member 5 projects from the auger shaft 11. The projected protrusion 13 is made to hit.
[0020]
The expansion blade 4 rotates around the center of a boss 41 provided eccentrically from the axis of the auger shaft 11. When the auger is rotated to the right (forward rotation), the diameter of the enlarged blade 4 is reduced by the resistance of the soil. And when it pulls up, the expansion blade | wing 4 contact | abuts to the lower end of a hollow pile, The shoulder part of the expansion blade 4 will be guided along the edge part of a hollow pile, and a diameter will be reduced completely.
Expansion of the diameter of the expansion blade 4 is achieved by rotating the auger counterclockwise (reverse rotation). The cutter shaft 1 is spline-connected to an auger shaft 11 that is externally fitted thereto. When the auger is switched to reverse rotation (left rotation), the outer surface spline (male teeth) of the cutter shaft 1 and the inner surface spline (female teeth) of the auger shaft are provided with a circumferential clearance. After idling only, the spline contacts and transmits the reverse rotational force.
[0021]
Due to this idling, the protrusion 13 protruding from the auger shaft 11 kicks one end of the swinging kicking member 5, the swinging kicking member 5 swings and the other end of the blade mounting arm 42 of the expanding blade 4. The side is kicked out and the expanding blade 4 is forcibly opened in the diameter increasing direction. At this time, the swinging kicking member 5 forcibly expands the expansion blade 4 by 20 to 30 mm in radius. Accordingly, the tip of the expansion wing 4 is completely expanded by the resistance of the natural ground by biting into the natural ground and continuing the left rotation. And as long as it is counterclockwise, the diameter expanded state is maintained. When the auger is pulled up while expanding the diameter at the lower end of the expanding bulb and rotating counterclockwise, it is dug while expanding and excavating the inside of the formation with the blade tip attached to the upper surface of the blade mounting arm of the expanding blade 4. The predetermined root-enlarged bulb portion can be easily and reliably formed.
[0022]
FIG. 5 is a view taken along the line CC of FIG. 2 and shows the excavation blade bit 3. The blade attachment arm 31 to which the blade bits 32, 33, 34, and 35 are attached is fixed to the blade shaft 1. The cutter bits 32 and 35 are fixed to be inscribed in the cutting edge circle 36.
FIG. 6 is a three-side view of the enlarged wing 4, (a) is a side view, (b) is a top view, and (c) is a front view. The base of the blade attachment arm 42 is attached to the boss 41, and the blade tip 43 is attached to the tip thereof. The blade attachment arm 42 has a spiral shape similar to an auger screw. That is, the blade attachment arm 42 is formed of a base wing having the same right-hand twist as the screw and a parallel plate portion with a drilling tip blade. This right twist base wing is in the same direction as the auger screw during hollow pile settlement propulsion excavation, facilitating the discharge and movement of excavated soil and increasing the excavation performance.
[0023]
The cutter tip 43 is a cemented carbide tip, and has an appropriate cutter angle 45 and clearance to excavate in the circumferential direction and the upward direction at the tip of the cutter attachment arm 42 when the auger rotates counterclockwise. It is attached with a corner 44.
Since the expansion wing 4 expands and excavates the rooted bulb upward, it can easily form an expanded bulb even on hard ground, excavation is excellent, and excavates in a short time compared to downward expansion full-surface excavation There is an advantage that can be.
[0024]
FIG. 7 is a longitudinal sectional view of FIG. 1, and its sectional view taken along the line PP is shown in FIG. 9 and 10 are exploded views of FIG. FIG. 9 shows the blade shaft 1, and the spline teeth 7 protrude to the outer diameter as shown in FIG. FIG. 10 shows an auger shaft 11 that is externally fitted to the blade shaft 1. The auger shaft 11 has a hollow shaft, and spline teeth 14 protrude from the inner surface as shown in FIG. As shown in FIG. 7, an auger shaft 11 is externally fitted to the blade shaft 1 and is splined. When the cutter shaft 1 and the auger shaft 11 are spline-coupled as shown in FIG. 8, the teeth 7 and 14 are coupled with a circumferential gap 8 therebetween. In addition, the SS sectional view taken on the line of FIG. 9 is shown in FIG. 12, and the TT arrow sectional view thereof is shown in FIG.
[0025]
Next, the brush of this invention is demonstrated. The brush of the present invention improves the adhesion between the inner surface of the hollow pile and the soil cement, and aims to integrate the root compaction bulb and the pile. This brush cleans the inner surface in the vicinity of the lower end portion of the hollow pile, and is provided on the outer surface of the auger shaft that fits around the cutter shaft. This brush repeatedly cleans the soil cement deposit on the inner surface of the hollow pile.
[0026]
FIG. 15 shows an example of this, and a notch is provided in the outer diameter of the screw 12 of the auger shaft, and the notch is attached to the notch. The base 60 of the brush 60 is fitted into and fixed to the outer periphery of the screw blade 12 from the outside in the radial direction. Then, the brush wire is extended radially outward.
16 and 17 show another example. One end of the base plate 71 of the brush is coupled to the outer peripheral surface of the auger shaft 11 with a pin 72 parallel to the auger shaft 11 so as to be swingable, and moves to the other end of the base plate 71. In this structure, the brush wire extends radially outward. When the auger shaft 11 rotates as indicated by an arrow 74, the spline teeth push up the cam of the brush 70 and are urged in the diameter increasing direction by the stopper 73 around the pin 72, and strongly pressed against the inner surface of the hollow pile. And clean the inner surface of the hollow pile.
[0027]
18 and 19 show still another embodiment. In the brush 80, a brush base plate 81 is attached to a plate 82 suspended from the lower surface of the screw blade 12 by a bolt 83, and a brush wire is projected radially outward.
Next, a method for reliably and efficiently forming the enlarged portion of the rooting method using the auger apparatus of the present invention will be described with reference to the drawings. FIGS. 22A to 22D are process diagrams schematically showing the process. Next, steps (a) to (d) will be described with reference to the drawings.
(A) The hollow pile 100 is submerged in the ground while excavating and discharging using the auger device 103 in the digging process during the digging process. When the final pile setting position (bulb formation area) 110 is reached, the hollow pile 100 is removed. Sinking from the rooting position 110 to the bulb formation area, and further excavation with forward rotation.
(B) Enlarged bulb formation start process The enlarged wing 4 is expanded in diameter, and cement milk is sprayed, and while being rotated in the reverse direction, it is pulled up and stirred to create an enlarged bulb 112.
(C) Pushing-down process The rotating bulb 112 is stirred down by rotating backward while jetting cement milk.
(D) Pulling up and stirring process The cemented milk is jetted and the enlarged blade is pushed up and stirred in the reverse rotation.
[0028]
When the agglomeration bulb agitation is completed, the auger shaft is rotated forward to reduce the diameter of the enlarged wing, and finally the hollow pile is pushed down while the auger is rotated forward to integrate the enlarged bulb 112 and the hollow pile 100 together. Let
[0029]
【The invention's effect】
According to the present invention, it is possible to reliably expand the diameter of the expanding blade, hold it in an expanded state, and reliably form a rooted expanded bulb. In the conventional method of expanding the expansion blade by resistance to earth pressure, the expansion of the expansion blade in the shape of a dango solidified with soil was uncertain, but in the present invention, the expansion blade was forced out and expanded. The tip of the wing blade is encroached into the ground around the shaft hole, forcing expansion, which is certain. This can be confirmed on the ground by increasing the torque of the auger device when the auger shaft is rotated to the left and switched to enlargement.
[0030]
Moreover, in this invention, it is excellent in the excavation property at the time of diameter reduction, can expand diameter reliably, and the axial excavation property with an expanded diameter is favorable. The fluidity of excavated sediment during shaft hole excavation is extremely good and excavation speed is fast. Conventionally, excavation of the shaft hole is also bad because the excavated soil becomes a dango shape. According to the method of the present invention, the diameter of the expansion blade is expanded and the bulb formation area is excavated upward. Greatly improved. In addition, bulbs with good quality can be formed, contributing greatly.
[0031]
Moreover, in this invention, since the inside of a hollow pile is cleaned effectively, the adhesiveness of a hollow pile and a root hardening layer improves, and a bulb and a pile can be integrated completely.
[Brief description of the drawings]
BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a side view showing the entire vicinity of an excavating blade of an auger apparatus according to an embodiment.
FIG. 2 is a side view of FIG. 1 rotated 90 degrees around an axis.
FIG. 3 is a view taken along the line AA in FIG.
4 is a view taken along the line AA of FIG. 1 and shows a state where an enlarged blade has a reduced diameter. FIG.
FIG. 5 is a view taken along the line CC in FIG. 2;
FIG. 6 is a three-side view of an enlarged wing.
7 is a longitudinal sectional view of FIG. 1. FIG.
8 is a cross-sectional view taken along the line PP in FIG.
FIG. 9 is an exploded view of FIG. 7;
10 is an exploded view of FIG. 7. FIG.
11 is a cross-sectional view taken along arrows QQ in FIG. 9;
12 is a cross-sectional view taken along the line S-S in FIG. 9;
13 is a cross-sectional view taken along the line TT in FIG.
14 is a view taken along the line RR in FIG.
FIG. 15 is an explanatory diagram of a brush.
FIG. 16 is an explanatory diagram of a brush.
FIG. 17 is an explanatory diagram of a brush.
FIG. 18 is an explanatory diagram of a brush.
FIG. 19 is an explanatory diagram of a brush.
FIG. 20 is an explanatory diagram of a digging method.
FIG. 21 is a process diagram of root-enlarged bulb creation.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Blade axis 2 Straight blade 3 Excavation blade bit 4 Expansion blade 5 Oscillation kick member 6 Oscillation kick member support part 7 Spline (male tooth)
8 Circumferential clearance 11 Auger shaft 12 Screw blade 13 Protrusion 14 Spline (female teeth)
31 Cutter attachment blades 32, 33, 34, 35 Cutter bit 36 Cutter tip circle 41 Boss 42 Cutter attachment arm 43 Cutter tip 44 Clearance angle 45 Cutter angle 46 Cutter tip circle (when diameter is reduced)
47 Cutting edge circle (when diameter is expanded)
60 Brush 61 Brush base 70 Brush 71 Base plate 72 Pin 73 Stopper 74 Rotation direction 80 Brush 81 Brush base plate 82 Hanging rod 83 Mounting bracket 100 Pile pile 101 Pile driver 102 Suspended mast 103 Auger drill 104 Drive device 105 Excavation blade 106 Underground 107 Auger screw 108 Enlarged bulb 110 Rooting position 112 Enlarged bulb

Claims (6)

In an auger device that sinks a hollow pile into the ground by using a medium digging method to create a rooted bulb, a swinging kicking member that kicks the side of the blade mounting arm of the magnifying wing is attached to the blade shaft, and the auger shaft to press the other end of the swing kick member projecting a projection to swing, a spline connection in which a circumference gap between blade axes and auger shaft, wherein the circumferential gap when the reverse rotation of the o Ga shaft The cutter shaft and the auger shaft rotate relative to each other, the projection kicks out one end of the kicking member, the other end of the kicking member kicks out the root of the expanding blade, and the expanding blade is forced in the expanding direction . An auger device characterized by being made to swing.   2. The auger apparatus according to claim 1, wherein a brush for cleaning an inner surface of the hollow pile is attached to an auger shaft that is externally fitted to the cutter shaft. 3. The brush according to claim 2, wherein a base portion of the brush is fitted and fixed to an outer peripheral portion of the auger shaft to be externally fitted so as to be detachable from the outside in the radial direction, and a brush wire extends outward in the radial direction. Auger device.   The brush has a stopper that restricts movement of the other end of the base plate by coupling one end of the base plate of the brush with a pin parallel to the auger shaft to the outer peripheral surface of the auger shaft, and the brush wire has a radius The auger apparatus according to claim 2, wherein the auger apparatus has a structure extending outward in the direction.   3. The auger apparatus according to claim 2, wherein the brush has a base portion attached to a plate suspended from the lower surface of the screw blade, and the brush wire extends radially outward. A hollow pile is sunk in the ground by an underground excavation method, and after the lower end pile reaches the root consolidation layer , the expanded wing is consolidated from the lower end of the hollow pile using the auger device according to any one of claims 1 to 5. Protruding downward to the lower end of the bulb, rotating the auger reversely to expand the enlarged wing, injecting cement milk and stirring the wing-solidifying layer while raising the enlarged wing while expanding the diameter to create an enlarged bulb A rooting method characterized by that.

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