JP4006838B2 - Drilling and stirring method and equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a ground excavation / mixing method and apparatus for building a steel pipe pile as foundation work in the fields of architecture and civil engineering.
[0002]
[Prior art]
For the construction of support piles and column piles, in order to build steel pipe piles in the ground, the ground is excavated and stirred in advance to make the steel pipes soft enough to be built. One of them is to form a soil cement to be excavated soil and agitated into a columnar shape and insert a steel pipe inside it.
[0003]
Since excavation and agitation of the ground such as creation of soil cement is difficult to perform with a normal earth auger with a continuous screw blade provided on the rod, excavation provided with a stirring blade having stirring performance Machine is used.
[0004]
There are various types of such excavators, but in the earth auger type, although not shown, a drill head having a drill bit installed at the tip of the rod is provided, and a screw blade is placed in the middle of the rod. An excavator is used in which stirring blades that are interrupted only for two pitches and a stirring blade that is formed by a horizontal plate are provided.
[0005]
The rod is a hollow tube, and a caking liquid such as cement milk is discharged from a tip portion where the excavation head is located, and this is agitated with excavation soil generated from the excavation head by a stirring blade.
[0006]
[Problems to be solved by the invention]
However, in a conventional excavator that excavates and agitates the ground, pebbles and other foreign matters may be mixed in the excavated soil. In addition, there is a possibility that the stirring blades may not be sufficiently stirred, and the consolidated liquid from the tip of the rod does not spread sufficiently upward and may not mix well with the excavated soil. Both of these cause insufficient excavation and agitation, and lead to a decrease in construction accuracy.
[0007]
An object of the present invention is to provide an excavation / stirring method and apparatus capable of solving the inconveniences of the above-described conventional example, obtaining reliable stirring, and improving construction accuracy.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the present invention is an auger rod whose upper end is connected to a rotary drive device as an excavation / stirring method, and an excavation head is provided at the tip to form an excavation portion, and the upper portion is extended outward in an arc shape. Use a drilling / stirring device that is provided with a trowel part of the curved pressing surface to be used as the excavated sediment compaction part, and further provided with stirring blades protruding above it at appropriate intervals, and the outer periphery of the stirring part is surrounded by a casing At the same time, this casing is suspended by a slide cylinder that is suspended from a rod rotation drive device so that it can be moved up and down, and part of the earth and sand excavated by the excavation part is consolidated into the hole wall by the excavation and sand compaction part and sent to the agitation part. The gist is to stir the inside of the casing.
[0009]
Further, the gist of the casing is to provide a liquid injection port at the upper part of the agitation unit and to stir while injecting the liquid into the casing.
[0010]
As an excavation / stirring device, first, an excavation head is provided at the tip of an auger rod whose upper end is connected to a rotary drive device to form an excavation portion, and a trowel portion of a curved pressing surface projecting outward in an arc shape above the excavation head The excavated earth and sand compaction section is provided, and stirring blades are provided above the excavating soil at appropriate intervals to form an agitating section. The outer periphery of the agitating section is surrounded by a casing, and the casing is suspended by a rod rotation drive device. Suspended and supported so as to move up and down by the cylinder, secondly, the casing is provided with a liquid injection port at the upper part of the stirring unit, thirdly, the casing is provided with a window hole for discharging earth and sand, and fourthly, the casing Protruding a resistance plate toward the inside, Fifth, Providing a stirring blade in addition to the iron part in the excavated earth and sand compaction part, Sixth, the iron part is above and below the curved pressing surface. On the outer periphery of It is to summarized as providing an upper inclined surface and lower inclined surfaces of paddle inclination.
[0011]
According to the first or third aspect of the present invention, since the excavated earth and sand compaction part is provided above the excavation part, and the stirring part is provided thereon, the earth and sand cut by the excavation head includes stones and the like. It can be pressed against the borehole wall by the iron part 7 to form a consolidated wall. As a result, the amount of industrial waste that comes to the ground is reduced, and the earth and sand sent to the agitation unit is small, and sufficient agitation is possible by incorporating fine aggregate.
[0012]
Furthermore, the agitator is surrounded by the casing, and the casing is suspended so as to move up and down by a slide cylinder that is suspended from the rotation driving device of the rod. The stirring action can be further improved by moving the casing up and down with a slide cylinder.
[0013]
According to the second and fourth aspects of the present invention, in addition to the above action, the casing is provided with a liquid injection port at the upper part of the agitating portion, and the liquid is agitated while being injected into the casing. Compared to the case, the liquid can be reliably mixed with the earth and sand, and in particular, the stirring effect is better in the stirring at the time of pulling up.
[0014]
According to the fifth aspect of the present invention, since the casing is provided with a window hole for discharging earth and sand, excess earth and sand can be released from the window hole to the outside of the casing, and clogging of the earth and sand in the casing can be prevented.
[0015]
According to the sixth aspect of the present invention, since the casing is provided with the resistance plate projecting inward, the stirring action can be further improved by the synergistic effect of the resistance plate and the stirring blade rotating inside the casing.
[0016]
According to the seventh aspect of the present invention, in the excavated earth and sand compaction part, in addition to the stirring in the iron part, the stirring blades are provided to agitate the stirring blades, and the excavation earth and sand compaction part can obtain the stirring action. The agitated earth and sand are sent to the agitation unit, and further agitated and sufficiently agitated.
[0017]
According to the eighth aspect of the present invention, the iron portion is provided with the upper inclined surface and the lower inclined surface that are inclined upward and downward from the curved pressing surface toward the outer periphery of the auger rod, so that the soil or the like always moves up and down. Thus, it is possible not only to remain on the upper and lower parts of the iron part, but also to make the consolidation to the outer periphery more efficient and to improve the stirring action in the iron part.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. 1 is a partially cutaway side view showing an embodiment of an excavation / stirring device according to the present invention, FIG. 2 is a partially cutaway side view of the same main part, and FIG. 3 is an arrow line AA in FIG. FIG.
[0019]
In the figure, reference numeral 1 denotes an auger rod, the upper end of which is connected to a connecting rod 1 a connected to the rotation output shaft 3 of the rotary drive device 2. Although not shown in the drawings, the rotary drive device 2 is a housing in which a hydraulic drive motor and a speed reducer are accommodated in a housing. The connection between the rotary output shaft 3 and the connecting rod 1a is a bolted flange, and the connecting rod 1a. As shown in FIG. 4, the connection between the auger rod 1 and the auger rod 1 is the hexagonal column male joint 22 at the upper end of the auger rod 1 and the lower end of the rotary output shaft 3 is connected to this male joint as shown in FIG. As a female joint 23 of a hexagonal hole hollow portion into which 22 is fitted, a lock pin 24 that engages both in the fitted state is inserted. The lock pin 24 is inserted into a notch formed in the male joint 22 on the half, and a notch in which the remaining half is engaged on the female joint 23, and is inserted into a circular hole formed by combining these notches. It will be a thing.
[0020]
Auger rod 1 (but not limited to a three in the illustrated example) for connection unit body 1 ₁ to 1 ₃ will be appropriately length connected, screw blades 4a in the vicinity of the tip of the unit body 1 ₃ The excavation head 4 having the excavation bit 4b planted at the lower edge is provided as an excavation part α, and the auger rod 1 is formed hollow as a whole with a liquid feed pipe, and a liquid injection port 6 is formed at the tip. .
[0021]
Further, a trowel portion 7 and a stirring blade 8 having a curved pressing surface projecting outward in an arc shape above the excavation portion α are provided as the excavation sediment compaction portion β.
[0022]
The iron part 7 has a thick flange shape with a curved pressing surface 7a projecting outward on the outer periphery of the auger rod 1 and is provided so as to rise spirally. The protruding side surface is always arcuate. The iron part 7 may be a hollow drum type.
[0023]
Further, the iron part 7 is provided with an upper inclined surface 7b inclined upward at an appropriate angle toward the outer periphery of the auger rod 1 and a lower inclined surface 7c inclined at an appropriate angle upward. Thereby, the iron part 7 becomes close to a half body in the form of a bobbin.
[0024]
In this way, the iron part 7 is provided with the lower inclined surface 7 c in addition to the upper inclined surface 7 b, so that the soil or the like always moves up and down and does not remain on both the upper and lower parts of the iron part 7. Therefore, it is possible to collect more on the curved pressing surface 7a, so that the consolidation to the hole wall becomes more efficient. Moreover, the earth and sand stirring effect by this iron part 7 itself other than the stirring blade 8 is also obtained.
[0025]
Auger rod 1 and stirring part γ and projecting a stirring blade 9 composed of horizontal wings unit body 1 ₂ that is located above the excavated soil compaction unit β at appropriate intervals. The protruding length of the stirring blade 9 is made up of a curved and inclined plate so that the tip does not protrude outside the curved pressing surface 7a of the iron part 7, but as shown in FIG. In addition, the majority of the blades are forward blades with an upward slope on the drawing, and the uppermost blades are reverse blades with an upward slope on the opposite side.
[0026]
A sand hole discharging window hole 11 is provided on the outer periphery of the excavated earth and sand compacted part β with the same diameter as the iron part 7, and a conical diameter resistance plate 12 is provided inwardly avoiding the window hole 11. Is surrounded by a protruding stirring casing 10.
[0027]
In addition, the stirring casing 10 is squeezed so that the diameter is reduced at the upper part, and the upper part is a male joint 10a with the upper connecting casing 10 ', but the liquid is injected into the stirring casing 10 at this squeezed position. Mouth 13 was formed.
[0028]
Coupling casing 10 'comprises a unit body 1 ₁ of the auger rod 1 and a double tube structure, and stirred casing 10 the upper coupling casing 10' of the female coupling said male joint 10a to the lower end of the connecting casing 10 'is fitted A male joint 10a 'is formed at the upper end of the connecting casing 10'. The fitting of the female joint 10b and the male joint 10a is the same as the connection of the auger rod 1 to the connecting rod 1a. The male joint 10a is a hexagonal column, and the female joint 10b is a hexagonal hole into which the male joint is inserted. As a thing to have, the lock pin engaged with both in a fitting state was inserted.
[0029]
On the other hand, a slide cylinder 14 is suspended from the rotational drive device 2 to the left and right, and a support ring body 15 fitted to the male joint 10a ′ at the upper end of the connection casing 10 ′ is suspended from the tip of the slide cylinder 14. The support wheel 15 is provided with a bracket 16 on the outside, which is pivotally attached to the slide cylinder 14, and the upper end of the slide cylinder 14 is also pivotally attached to the rotary drive device 2. Further, the slide holder 17a is raised upward from the bracket 16, and is slidably fitted to a fixed holder 17b suspended from the rotation drive device 2.
[0030]
A liquid injection port 13 formed in the upper portion of the stirring casing 10 is connected to a liquid supply pipe 18 disposed in the connection casing 10 '. The liquid supply pipe 18 is connected to a liquid injection pipe 19 provided in the support ring body 15. Connecting.
[0031]
Next, the excavation / stirring method of the present invention performed using such an excavating / stirring apparatus will be described with reference to FIGS. 1 and 5 to 7.
[0032]
Unit body 1 ₁ of the auger rod 1 to the rotary drive unit 2 and connecting the casing 10 'connect the unit body 1 ₁ and the connecting casing 10' and the upper end of the unit body 1 ₁ of the auger rod 1 as shown in FIG. 2 In the state where the male joint is protruded, it is coupled with the set pin 20 and lifted together to stand on the ground.
[0033]
_First , the upper end of the unit body 11 of the auger rod 1 is inserted into the connecting rod 1a, and a locking pin is inserted and fixed. Then, to release the coupling of the vent connecting the casing 10 'and the unit body 1 ₁ of the set pin 20. In this state, the slide cylinder 14 is contracted, and the support wheel 15 is positioned above the lower end of the connecting rod 1a so as not to obstruct the connection between the auger rod 1 and the connecting rod 1a.
[0034]
Next, the slide cylinder 14 is extended to lower the support ring body 15, and this is fitted into the male joint 10a 'at the upper end of the connection casing 10', and a lock pin is inserted and fixed.
[0035]
Pulling on the rotary drive unit 2 and the connecting casing 10 connected to 'the unit body 1 ₁ and, likewise in advance by combining the upper part of the stirring casing 10 and the unit body 1 ₂ of the auger rod 1 with set pin 20 lifting both, it makes a connection to the unit body 1 ₁ of the unit body 1 ₂ above, and then performs the connection between stirred casing 10 and the coupling casing 10 '. Incidentally, this stirring casing 10 when the lower end comes out to below the unit body 1 ₂ of stirring casing 10 unlike shown because it stands on the ground, was directly connected to the unit body 1 ₁ of the unit body 1 ₂ Later, the set pin 20 can be pulled out, the slide cylinder 14 can be extended, and the connecting casing 10 ′ can be lowered to connect to the stirring casing 10. Further, when the lower end of the unit body 1 ₂ as shown exits from the lower end of the stirring casing 10, the unit body 1 ₂ and stirred casing 10 is temporarily bonded with separate hairpin like, after removing the set pins 20 Also combine both with this hairpin.
[0036]
Further, the unit body 1 ₂ of the auger rod 1 to connect the unit body 1 ₃ attached drilling head 4 to the tip.
[0037]
This completes the setting of the excavation / stirring device. Next, in order to perform excavation / stirring work, as shown in FIG. 5, the rotary drive device 2 is rotated forward (leftward in the drawing), Excavation is performed with the bit of the excavation head 4 at the tip.
[0038]
The earth and sand cut by the bit of the excavation head 4 at the tip is transferred to the excavation earth and sand compacted part β by the lifting action by the turning of the iron part 7 accompanying the forward rotation of the auger rod 1, and the curvature of the iron part 7 is bent during this transfer. It is pushed out to the outside by the pressing surface 7 a and consolidated into the hole wall 21. In that case, relatively large pebbles and other foreign substances are also consolidated into the hole wall 21 by the iron part 7.
[0039]
Moreover, consolidated material or bentonite solution of cement milk or the like from the distal end of the unit body 1 _3, water and the like out of the liquid inlet 6 Note, which was stirred to gel at iron portion 7 and the agitating blade 8 with sediment The object is consolidated to the hole wall 21 by the iron part 7.
[0040]
In the stirring section γ, the connecting casing 10 ′ and the stirring casing 10 are stopped without rotating with respect to the rotation of the auger rod 1, and the earth and sand enter the stirring casing 10, and the interaction between the stirring blade 9 and the resistance plate 12 occurs. Stir. Further, since the uppermost stirring blade 9 is a reverse blade, it is further kneaded, and at this time, the slide cylinder 14 is expanded and contracted to move the stirring casing 10 up and down together with the connecting casing 10 'to further increase the stirring effect.
[0041]
Further, the agitation is performed by pouring a caking material such as cement milk, bentonite liquid, water or the like into the inside of the agitation casing 10 from the injection port 13.
[0042]
In addition to the vertical movement of the agitating casing 10 by extending and contracting the slide cylinder 14, the whole may be moved up and down by moving the rotary drive device 2 suspended from the leader mast or the top sheave of the boom.
[0043]
When the whole is built, the connecting casing 10 ″ fixed with the set pin 20 and the unit body (not shown) of the auger rod 1 are suspended and jointed using the slide cylinder 14 in the same manner.
[0044]
After excavation to a predetermined depth, a caking material for root consolidation is poured out from the liquid injection port 6, and at this time, the whole is moved up and down by moving the rotary drive device 2 up and down. The rod 1 is rotated in the reverse direction by the rotation driving device 2, and caking material such as cement milk, bentonite liquid, water, etc. are poured out from the liquid injection port 6 at the tip of the auger rod 1, and the rotation driving device 2 is moved up and down. As a result, the whole is moved up and down and the slide cylinder 14 is expanded and contracted to move the stirring casing 10 up and down.
[0045]
The pouring of cemented milk or other solidified material such as cement milk, bentonite liquid, water or the like into the inside of the stirring casing 10 from the liquid injection port 13 at the top of the stirring casing 10 is appropriately performed according to the state of the ground.
[0046]
After excavating and stirring in this way, a steel pipe (pile) is built.
[0047]
【The invention's effect】
As described above, the excavation / stirring method and apparatus according to the present invention has the excavated sediment compacted part at the upper part of the excavated part, and further has the agitated part thereon, so that the earth and sand cut by the excavating head includes stones and the like. Therefore, industrial waste that is pressed against the drilling hole wall by the trowel part and goes out to the ground is reduced, and the earth and sand sent to the stirring part can be sufficiently stirred as fine aggregate.
[0048]
In addition, the stirring is performed by moving the casing up and down inside the casing, and by pouring the liquid into the casing, so that stirring can be performed more reliably.
[0049]
Further, the auger rod and the casing can be easily added using the slide cylinder.
[0050]
In addition, since the hole wall is consolidated at the iron part, the frictional resistance of the ground can be reduced to build a non-rotating casing, and the hole wall is less likely to collapse when a steel pipe is built later. The above-mentioned high quality agitated earth and sand enhances the root-solidifying action of the root-solidifying liquid and provides a highly reliable pile.
[Brief description of the drawings]
FIG. 1 is a partially cutaway side view showing an embodiment of an excavation / stirring device according to the present invention.
FIG. 2 is a partially cutaway side view showing a main part of an embodiment of the excavation / stirring device according to the present invention.
FIG. 3 is a view taken along the line AA in FIG. 2;
FIG. 4 is a cross-sectional view showing joining of auger rods.
FIG. 5 is a side view of a first step showing an embodiment of the excavation / stirring method according to the present invention.
FIG. 6 is a side view of a second step showing an embodiment of the excavation / stirring method according to the present invention.
FIG. 7 is a side view of a third step showing an embodiment of the excavation / stirring method according to the present invention.
[Explanation of symbols]
1 ... auger rod 1a ... connecting rod 1 ₁ to 1 ₃ ... unit body 2 ... rotary drive device 3 ... rotation output shaft 4 ... drilling head 4a ... screw blade 4b ... boring bit 6 ... pouring hole 7 ... iron portion 7a ... Curved pressing surface 7b ... Upper inclined surface 7c ... Lower inclined surface 8, 9 ... Agitation blade 10 ... Agitation casing
10 ', 10 "... Connection casing 10a, 10a' ... Male joint
10b Female fitting
11 ... Window hole 12 ... Resistance plate
13 ... Injection port 14 ... Slide cylinder
15 ... support ring 16 ... bracket
17a ... Slide holder 17b ... Fixed holder
18 ... Liquid supply pipe 19 ... Liquid injection pipe
20 ... Set pin 21 ... Hole wall
22 ... Male fitting 23 ... Female fitting
24 ... Lock pin

Claims (8)

It is an auger rod whose upper end is connected to the rotary drive device, and a drilling head is provided at the tip to form a drilling part, and a curved pressing surface that projects outwardly in a circular arc shape above it is provided as a drilling earth and sand compaction part, Furthermore, a slide cylinder in which an agitating blade is provided at an appropriate interval above the excavating / stirring device, and the outer periphery of the agitating portion is surrounded by a casing, and the casing is suspended from a rod rotation driving device. The excavation / stirring method is characterized in that it is suspended so as to move up and down at a part, and the earth and sand excavated at the excavation part is partially consolidated into the hole wall at the excavation earth and sand compaction part and sent to the agitation part and agitated inside the casing. The excavation / stirring method according to claim 1, wherein the casing is agitated while pouring the liquid inside the casing by providing a liquid injection port at the upper part of the agitation part. An excavation head is provided at the tip of the auger rod whose upper end is connected to the rotation drive device to form an excavation portion, and a trowel portion of a curved pressing surface projecting outward in an arc shape is provided above the excavation sediment compaction portion. Stirrer blades are projected upward at appropriate intervals to form a stirring unit, and the outer periphery of the stirring unit is surrounded by a casing, and the casing is suspended and vertically moved by a slide cylinder vertically mounted on a rod rotation driving device. Excavation and stirring device characterized by that. The excavation / stirring apparatus according to claim 3, wherein the casing is provided with a liquid injection port at an upper portion of the stirring portion. The excavation / stirring apparatus according to claim 3 or 4, wherein the casing is provided with a window hole for discharging earth and sand. The excavation / stirring apparatus according to any one of claims 3 to 5, wherein the casing is provided with a resistance plate projecting inward. The excavation / stirring apparatus according to any one of claims 3 to 6, wherein a stirring blade is provided in addition to the iron portion in the excavated earth and sand compaction portion. The excavation / stirring device according to any one of claims 3 to 7, wherein the iron portion is provided with an upper inclined surface and a lower inclined surface that are inclined upward and downward from the curved pressing surface toward the outer periphery of the auger rod.

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