JPH02108724A - Enlarged-dia. hole drilling method and enlarged-dia. knot piling method - Google Patents

Abstract

PURPOSE:To intend simplified working processes and shortened working periods by providing an auger shaft with a multiple step of hydraulic-operating dia. enlarging devices whose pitches are adapted to the pitches of knot-attached core materials and forming the enlarged dia. portions of respective steps simultaneously. CONSTITUTION:A multiple step of dia. enlarging devices 2 with hydraulic- operating dia. enlarging edges 7 are installed in an axial direction of an auger shaft 1. Then, the pitches of the dia. enlarging devices 2 are adapted to the pitches of the knots of knot-attached core materials. So, when the ground is bored or after it is bored up to a preset depth, the dia. enlarging devices 2 are enlarged in dia. to form enlarged dia. portions on a hole wall simultaneously in respective steps. Then, an outside lacing 6 is provided with an opening 8 for the entry of the dia. enlarging 7 in and out to form a case auger 9 for boring. It is thus possible to rationalize boring work for an enlarged-dia. hole.

Description

[Detailed Description of the Invention] [Industrial Application Field 1] The present invention relates to an enlarged diameter hole drilling method for creating an enlarged diameter hole having an enlarged diameter portion in the ground, and an enlarged diameter knot pile construction method for inserting a core material into the enlarged diameter hole. This invention relates to

[Prior Art] Japanese Patent Publication No. Sho GO-35489 has been known as a method of forming an excavated hole with an enlarged diameter portion in the ground.

In the conventional example shown in Japanese Patent Publication No. 30-35489, one diameter expanding device is installed at one location in the f section of the auger shaft, and the ground is excavated to a predetermined depth by the auger shaft. After that, the auger shaft is rotated in the opposite direction to enlarge the enlarged diameter part to form the lowest enlarged part, and then the auger shaft is rotated in the normal direction to contract the enlarged diameter blade and raise the auger shaft a certain length.
Further, the auger glaze is reversed and the diameter of the diameter expanding device is expanded to form a second stage of enlarged parts, thereby forming enlarged parts in multiple stages vertically in the drilled hole one after another.

[Problems to be Solved by the Invention] However, in the above-mentioned conventional example, only one diameter expanding device is provided at one location of the auger shaft. It is necessary to repeat the process of pulling up a certain length and reversing it to form an enlarged part, and then repeating the process of pulling it up a certain length and reversing it to form an enlarged part, which makes the process complicated and time-consuming. Furthermore, there is a problem in that it is difficult to accurately measure the distance between the enlarged portions formed in multiple stages on the upper side.

The present invention was invented in view of the problems of the prior art as described above, and its purpose is to form enlarged portions in multiple stages above and below an excavation hole. The parts can be formed at the same time, simplifying the process, and
The distance between the enlarged sections formed in multiple upper and lower stages can always be a constant distance, and a core material can be inserted into this excavation hole to form strong expanded diameter knot piles. To provide an enlarged-diameter hole drilling method and an enlarged-diameter knot pile method that can be constructed by accurately matching knots of a core material to enlarged portions formed in upper and lower stages in an excavated hole.

[Means for Solving the Problems] In order to achieve the above object, the diameter expanding hole drilling method of the present invention provides a diameter expanding device 2 in multiple stages in the axial direction of the auger pongee 1, and when drilling a hole in the ground 3 or at a predetermined time. After drilling a deep hole, the diameter expanding device 2
The diameter of the excavated hole 5 is enlarged to provide an enlarged diameter portion 4.

Here, the means for expanding the diameter of the diameter expanding device if2 may be hydraulic pressure such as oil pressure.

Further, an external casing 6 is disposed around the outer periphery of the auger sleeve 1, and an opening 8 is provided in the external casing 6 through which the diameter expanding blades 7 of the diameter expanding device 2 provided in multiple stages in the axial direction of the auger pongee 1 come and go. to form a case auger 9, and when using this case auger 9 to dig a hole in the ground 3 or after digging a hole to a predetermined depth, the diameter expanding device 2 is expanded to insert the diameter expanding blade 7 into the opening of the external casing 6. Excavation hole 5 with enlarged diameter part 4 protruding from 8
You may also create a .

In addition, when inserting the knotted core material 10 such as the knotted pile 10a or the reinforcing bar 11110b having the knotted portion into the excavated hole 5 having the enlarged diameter portion 4 to form the enlarged diameter knotted pile, the auger shaft 1 is provided with multiple stages. The pitch of the diameter expanding device 2 is set to the knots 10c of the knotted core material 10.
The pitch may be adjusted to match the pitch of .

[Function] In the present invention, the diameter expanding device 2 is provided in multiple stages in the axial direction of the auger shaft 1, and the diameter of the diameter expanding device 2 is expanded when digging a hole in the ground 3 or after digging a hole to a predetermined depth. By expanding the diameter of the diameter expanding device 2 and creating an excavated hole 5 with an enlarged diameter portion 4, the diameter of the excavated hole 5 is expanded.
When forming the enlarged diameter portion 4 on the hole wall, it is possible to simultaneously form a plurality of stages of enlarged diameter portions 4 vertically in the excavated hole 5.

Further, by using hydraulic pressure such as oil pressure as a means for expanding the diameter of the diameter expanding portion ra2, the diameter of the diameter expanding device 2 can be reliably expanded when necessary.

Further, an external casing 6 is disposed around the outer periphery of the auger shaft 1, and an opening 8 is provided in the external casing 6 through which the diameter expanding blades 7 of the diameter expanding device 2 provided in multiple stages in the axial direction of the auger shaft 1 emerge and retract. By forming a case auger 7y-9 and using this case auger 9 to create an excavation hole 5 with an enlarged diameter portion 4, the enlarged diameter portion f! When expanding the diameter of i2 to form the enlarged diameter portion 4 in multiple stages up and down, the external casing 6 prevents the hole wall of the drilled hole 5 other than the portion where the enlarged diameter portion 4 is being excavated from collapsing. It is now possible to accurately form enlarged diameter portions 4 having a size of 100 mm in multiple vertical stages at predetermined positions.

In addition, a knot pile 10a and a reinforcing bar 1 having a knot are provided in the excavated hole 5 having the enlarged diameter portion 4! When inserting a knotted core material 10 such as IL1011 to form a diameter-expanded knotted pile, the pitch of the diameter expanding device 2 provided in multiple stages on the auger shaft 1 is set to the knot 1 of the knotted core material 10.
By matching the pitch to 0c, the plurality of knots 10c of the knotted core material 10 can be constructed in alignment with the plurality of enlarged diameter portions 4 accurately.

[Example] The present invention will be explained in detail below with reference to Examples.

Creating the excavation hole 5 with the enlarged diameter part 4! ! The location is fjI
In the embodiment shown in FIG. J1, the auger pongee 1 is arranged inside the outer casing 6, and the outer casing 6 and the auger shaft 1 are rotated independently by a driving device fi21. The auger shaft 1 with a bit at the tip is hollow, and this hollow part is used to supply cement, milk mortar, etc., and discharged from the discharge port provided at the tip of the auger shaft 1 or other parts. It looks like this. As shown in FIG. 1, an embodiment is shown in which the auger shaft 1 is provided with a screw part 11 and a stirring device 12. There are some types in which a stirring device 12 is provided at an appropriate position in the longitudinal direction of the auger shaft 1, and the like. The auger shaft 1 is provided with diameter expanding devices 2 in multiple stages in the axial direction. As shown in FIG. 1, the diameter expanding device 2 may include, for example, a support portion 14 provided on the auger shaft 1, a screw portion 11, a shaft 13 on a stirring device 12, or the like.
When the expanding blade 7 is rotatably attached and the auger shaft 1 is rotated in a certain direction, the expanding blade 7 rotates in one direction due to earth pressure, and the expanding blade 7 is rotated as shown by the broken line in FIGS. 2 and 3. becomes a non-protruding state and rotates in the opposite direction, the diameter-expanding blade 7 rotates in the opposite direction at Tonosho, and is supported by the stopper 15 in an expanded diameter state as shown by the solid line in FIGS. 1, 2, and 3. It is designed to maintain the expanded diameter state. In FIGS. 4 and 5, the diameter-expanding blade 7 is actuated by a hydraulic cylinder 16 such as oil pressure. Hydraulic sill 16 is screw part 1
1 by a shaft 16a, and the tip of the rod of the hydraulic sill 16 is pivotally supported at the rear end of the enlarged diameter blade 7 by a pongee 16b.

In FIG. 4, reference numeral 16c is an oil pipe for feeding oil to the hydraulic cylinder 16. Here, in the above embodiment, an example was shown in which the hydraulic sill 16 was attached to the screw part 11, but the support part 14 provided on the auger sleeve 1 or the stirring device (
112, etc., with a shaft support.

The outer casing 6 is provided with openings 8 in multiple WL stages on the upper and lower sides, and the positions of the openings 8 provided in the multiple stages on the upper and lower sides of the external casing 6 are determined by the diameter expanding devices 2 provided on the auger shaft 1 in multiple stages. and the corresponding level.

FIGS. 6 and 7 show an example of a device for making the diameter expanding device 2 and the opening 8 face each other in the circumferential direction. 6th
7, an inner rotating shaft 22 and an outer rotating pongee 23 protrude from the do portion of the driving device RA21, the upper end of the auger pongee 1 is connected to the inner rotating @22, and the outer A rotation transmission joint 24 is attached to the rotation shaft 23, and the upper end portion of the outer casing 6 is attached to this rotation transmission joint 24. For example, the rotation transmission joint 24 has a vertically long hole 2.
5 is provided, and a bolt 26 inserted through this elongated hole 25
is attached to the outer casing 6.

A locking arm 27 projects from the upper part of the auger shaft 1, and a locked portion 28 is provided on the inner surface of the outer casing 6. In the state shown in FIG. 6, the locking arm 27 and the locked portion 28 are vertically misaligned, and even if the auger shaft 1 and the external casing 6 rotate in opposite directions, the locking arm 27 and the locked portion 28 are vertically misaligned. It is designed so that it does not come into contact with the stop part 28. That is, when the ground 3 is normally excavated in the vertical direction to form the excavated hole 5, the state shown in FIG. 6 is obtained. On the other hand, bolt 2
6 and pull the drive device 21 upward a little, the auger shaft 1 will rise a little with the drive device 21, and the rotation transmission joint 24 will also rise a little, but since the bolt 26 is loose, it will be vertically long with respect to the bolt 26. The hole 25 portion slides, and as a result, the outer casing 6 does not rise. Therefore, the locking arm 27 is at the same level as the locked part 28, so when the auger pongee 1 is rotated in this state, the locking arm 27 hits the locked part 28, and this state is exactly when the outer casing 6 The openings 8 provided in multiple stages above and below the auger shaft 1 and the diameter expanding blades 7 of the diameter expanding device 2 provided in multiple stages on the auger shaft 1 are arranged to face each other in the circumferential direction.

Therefore, when forming the excavated hole 5 having the enlarged diameter hole 4 using the Coos-9 constructed as described above, the excavated hole 5 is formed by excavating the ground 3 using the Case-Off-9. , when digging a hole in the ground 3 or after digging a hole to a predetermined depth, the diameter of the diameter expanding device 2 is expanded to cause the diameter expanding blade 7 of the diameter expanding portion ff2 to protrude outward from the opening 8 of the outer casing 6. An excavated hole 5 provided with an enlarged diameter portion 4 is created. Here, for example, a diameter expander! 2 is of the type that expands due to earth pressure or becomes non-expanded, the expanded diameter part r! The auger shaft 1 is rotated in the direction in which the diameter of the outer casing 12 is not expanded, and the outer casing 6 is rotated in the opposite direction to the auger shaft 1 as shown in FIG.
The excavation is carried out as shown in a). When forming the enlarged diameter portion 4, the rotation of the outer casing 6 and the auger pongee 1 is stopped, and in this state, the bolt 26 is loosened and the drive device 21 is pulled up a little to engage the locking arm 27 and the locked object. part 28 at the same level, tighten the bolt 26,
In this state, the auger pongee 1 is rotated in the opposite direction to lock the locking arm 27 and the locked portion 28, and the enlarged diameter blade 7 and the opening 8
are opposed to each other, and the enlarged diameter blade 7 opens at Tonosho to form an opening 8.
The diameter-expanding blade 7 protrudes from and expands in diameter, and the diameter-expanding blade 7 hits the stopper 15 to maintain the expanded diameter state.

Then, in this state, rotate the outer casing 6 and the auger pongee 1 in the same direction (the direction in which the enlarged diameter blade 7 opens due to earth pressure) at the same speed! @9 As shown in Figure (b), the expanded diameter portion 4 is formed by the expanded diameter blade 7. After forming the enlarged diameter portion 4, the outer casing 6 and the auger shaft 1 are rotated in the opposite direction to the above, and the enlarged diameter blade 7 is pulled up in the non-diameter state by earth pressure, or the auger shaft 1 is rotated in the opposite direction. The diameter-expanding blade 7 is rotated in the opposite direction to the non-diameter-expanded state, and in this state, the locking arm 27 and the locked portion 28 are shifted in level in the vertical direction, and then the auger pongee 1 is rotated and the outer casing 6 is rotated. is pulled up while rotating in the opposite direction to the auger Tsumugi 1. Fig. 9(e) shows multiple enlarged diameter portions 4 on the upper and lower sides after the lift has been raised.
A borehole 5 having a diameter is shown.

Also, when the diameter of the expansion blade 7 is expanded or not expanded by the hydraulic sill 16, the locking arm 27 and the locked portion 28 are connected in the non-diameter expansion state of the expansion blade 7, as described above. When expanding the diameter of the expanding blade 7 by slightly shifting it up and down, the locking arm 27
Rotate the auger sleeve 1 with the and locked portion 28 at the same level, and expand the diameter of the expanding blade 7 with the hydraulic sill 16 with the diameter expanding blade 7 and the opening fn8 facing each other, and the auger shaft 1 and The outer casing 6 is rotated in the same direction as the outer casing 6 to form a plurality of upper and lower enlarged diameter portions 4 using the enlarged diameter blade 7.

The outer casing 6 not only serves to prevent the inner wall of the borehole 5 from collapsing during excavation or stirring, but also serves to prevent the inner wall of the borehole 5 from collapsing, especially when expanding the diameter of the diameter expanding device 2 to form the expanded diameter section 4. The outer casing 6 protects the inner wall of the excavated hole 5 other than the part excavated by the diameter blade 7 from collapsing, and only a predetermined part can form an enlarged diameter part 4 that is accurately excavated in multiple stages. .

By the way, when forming the enlarged diameter portion 4, as shown in FIG. 9(b)
As shown in FIG. 9(e), by expanding the diameter of the diameter-expanding blade 7 to form the diameter-expanding portion 4 without moving the device up and down, the diameter-expanding portion 4 can be provided in multiple stages as shown in FIG. 9(e). Alternatively, the enlarged diameter portion 4 which is vertically long may be formed by lifting the device upward with the enlarged diameter blade 7 in an enlarged state. Further, when forming the excavated hole 5 having the enlarged diameter portion 4, cement, milk mortar, etc. may be injected from the auger shaft 1 to fill the excavated hole 5 having the enlarged diameter portion 4 with cement, milk mortar, etc.

In this case, an auger shaft 1 having a screw ff1s11 extending upward and downward is used, and the auger wheel 1 is rotated to excavate the ground 3, and the excavated soil is raised by the screw part 11 to the upper part of the external casing 6. The excavated soil is discharged through a discharge window, and the excavated soil is filled with cement and milk mortar. At this time, you may excavate while discharging cement, milk mortar, etc. from the auger shaft 1, or alternatively, you may excavate while discharging bentonite from the auger pongee 1, and use cement instead of bentonite when pulling up the auger pongee 1. , milk mortar, etc. may be discharged. In the above embodiment, a stirring device 12 is attached to the auger shaft 1.
Although the embodiment has been shown in which the auger shaft 1 is provided with the agitation fitting Wi 12 and the screw part 11, or the auger shaft 1 is provided with the screw part 11 at an appropriate position in the longitudinal direction of the auger pongee 1. may be used.

Further, when forming the excavated hole 5 having the enlarged diameter portion 4, the excavated earth and sand, cement, milk mortar, etc. may be stirred and mixed and then filled into the excavated hole 5. In this case, an auger shaft 1 equipped with an agitation device RA12 is used, and the ground is excavated with the auger shaft 1 while discharging cement, milk mortar, etc., and the agitation device mixes the excavated soil, cement, milk mortar, etc. 12 for stirring and mixing. Stirring and mixing are performed both when the auger shaft 1 and the external casing 6 rotate in opposite directions and when they rotate in the same direction. Now, stir! 20 in FIG. This stabilizer is attached to the shaft 1, and its outer end faces the inner surface of the outer casing 6 with a gap therebetween, and serves to position the auger pongee 1 at the center of the outer casing 6.

By the way, when the stirring device RA12 is provided on the inner surface of the outer casing 6 and the auger shaft 1, the auger pongee 1 and the outer casing 6 are rotated in mutually opposite directions during excavation or pulling up. By rotating in opposite directions in this manner, stirring and mixing can be performed more effectively.

Further, when the rotation speeds are busy in the same direction, stirring and mixing can be performed more effectively by making the rotation speeds of the outer casing 6 and the auger sleeve 1 different. When rotating in the same direction and changing the rotational speed, the rotational speed is changed when the diameter-expanding blade 7 is in the non-diameter-expanding state.

In the above embodiment, an example in which the outer casing 6 is disposed around the outer periphery of the auger shaft 1 has been described, but without using the outer casing 6, as shown in FIG. The excavated hole 5 having the enlarged diameter portion 4 may be formed only by the auger shaft 1. In this case, the auger shaft 1 includes the screw portion 11 and the stirring device 1 as described above.
2, only the screw part 11, or only the stirring device 12.

In Fig. 10 and Fig. 11, the diameter expanding device 2 is provided with multiple stages above and below.
This example shows an example in which the upper and lower diameter expanding devices 2 have different protruding lengths in the diameter expanding state.

According to this embodiment, as shown in FIG. 12, excavated holes 5 can be created in which the diameters of the upper and lower enlarged diameter portions 4 are different.

The excavated hole 5 having the enlarged diameter portion 4 formed according to the present invention can be used as a ground improvement column as it is.

Further, an excavation hole 5 having an enlarged diameter part 4 filled with cement, milk mortar, etc. formed as described above, or an excavation hole having an enlarged diameter part 4 filled with excavated earth and sand, cement, milk mortar, etc. As shown in FIG. 13 and FIG.
0' can also be inserted to form a strong expanded diameter joint pile. In this case, concrete piles, steel pipe piles, H-shaped steel piles, etc. are used as the piles 10a.

Furthermore, as shown in FIGS. 15 and 16, a knotted core material 10 having knots 10c such as a knotted pile 10a or a reinforcing bar cage 10b having knotted portions may be used as the core material to be driven. In this case, a plurality of pitches between the enlarged diameter portions 2 provided in multiple stages in the axial direction are provided on the auger shaft 1 to form the enlarged diameter portions 4 in multiple stages vertically in the excavated hole 5, above and below the knotted core material 10. As a result, the pitch between the multi-stage enlarged diameter portions 4 formed by the multi-stage enlarged diameter portions 2 is equal to the 1fR10c pitch of the knotted core material 10, Construction can be performed by positioning the joints 10c in accurate correspondence with the enlarged diameter portions 4 in multiple stages.

In addition, when the external casing 6 is provided in the present invention, a screw may be wound around the outer periphery of the external casing 6. In this case, when the diameter expanding blade 7 is expanded, it is designed to protrude further outward than the screw.

[Effects of the Invention] As described above, in the present invention, the diameter expansion vc position is provided in multiple stages in the axial direction of the auger shaft, and the diameter expansion is performed at the time of digging a hole in the ground or after digging a hole to a predetermined depth. Since the diameter of the drilled hole is expanded by expanding the diameter of the device to create a diameter-expanded portion, when the diameter of the diameter-expanding device is expanded to form the diameter-expanded portion on the hole wall of the drilled hole, multiple steps are simultaneously placed in the top and bottom of the drilled hole. It is possible to form an enlarged diameter part, simplifying the process,
The construction time can be shortened and the distance between the multiple enlarged diameter portions formed can be kept constant.

In addition, by using hydraulic pressure such as hydraulic pressure as the means for expanding the diameter of the diameter expansion device, the diameter of the diameter expansion device can be expanded reliably when necessary, and construction work can be performed more accurately.

Further, an outer casing is disposed around the outer periphery of the auger shaft, and an opening is provided in the outer casing for the diameter expanding blades of the diameter expanding device provided in multiple stages in the axial direction of the auger shaft to enter and retract, thereby forming a case auger, This case auger is used to create an excavated hole with an expanded diameter section, so when expanding the diameter of the diameter expanding device to form multiple stages of expanded diameter sections on the upper r, the section where the expanded diameter section is being excavated is It is possible to accurately form enlarged diameter portions of a predetermined size in multiple vertical stages at predetermined positions while preventing the wall of the excavation hole from collapsing with the external casing.

In addition, reinforcing bars with joint piles and joints in drilled holes with enlarged diameter parts nr? When inserting the knotted core material to form an expanded diameter knotted pile, by matching the pitch of the diameter expanding device installed in multiple stages on the auger shaft to the pitch of the knots of the knotted core material, the knotted core material The construction can be performed by accurately aligning the multiple joints of the pipe with the multiple enlarged diameter parts.

[Brief explanation of drawings]

Figure WIJ1 is a partially omitted vertical cross-sectional view of an embodiment of the device of the present invention, Figure 2 is a cross-sectional view taken along the line X-X in Figure 1, Figure tjS3 is a cross-sectional view taken along the Y-Y line in Figure 1, and Figure 4 is a cross-sectional view taken along the line Y-Y in Figure 1. The figure is a partially omitted vertical cross-sectional view of another embodiment of the same as above, FIG. 5 is a cross-sectional view of the same as above, FIG. FIG. 7 is a cross-sectional view of the same as above, FIGS. The figure is a partially omitted vertical sectional view of still another embodiment of the device of the present invention, FIG. 11 is a partially omitted longitudinal sectional view of still another embodiment of the device of the present invention, and FIG. 12 is a t51
0 or 11; FIG. 13 is a sectional view of an embodiment in which a core material is inserted into the drilling hole; and FIG. 14 is another embodiment in which the same core material is inserted. 15 is a sectional view of another embodiment in which the same core material as above is inserted; FIG. 16 is a sectional view of another embodiment in which the same core material is inserted; 1 is an auger shaft , 2 is the diameter expansion device, 3 is the ground, 4 is the diameter expansion part, 5 is the excavation hole, 6 is the external casing, 7
1 is a diameter expanding blade, 8 is an opening, 9 is a case auger 10 is a knotted core material, 10a is a knotted pile, 10b is a reinforcing bar capacity, and 10c is a knot. Agent Patent Attorney Ishi 1) Ai Seven Shoulders 2 Gub γ3Z 114 Figure A 5x Fu Figure ＼ 8 Tsuru 1C, 8 1 aba 1 ← Tsukibatsu After Bo also 5-begin-type steal-type Zhuang-shi-kata mouth. Village to mutual - ~ size -■ ('-QQ's surprise 8■ 薯10Figure 12 Figure 11■ 'et13Figure 114 Flash 3... Ground truth Figure 15

Claims (4)

[Claims] (1) Install a diameter expanding device in multiple stages in the axial direction of the auger shaft,
A diameter-expanding hole drilling method characterized by expanding the diameter of the diameter-expanding device during drilling in the ground or after drilling to a predetermined depth to create an excavated hole with an enlarged-diameter portion. (2) The diameter expanding hole drilling method according to claim 1, wherein the means for expanding the diameter of the diameter expanding device is hydraulic pressure such as oil pressure. (3) A case auger is formed by disposing an external casing around the outer periphery of the auger shaft, and providing an opening in the external casing through which diameter expanding blades of a diameter expanding device provided in multiple stages in the axial direction of the auger shaft emerge and retract. When the case auger is used to dig a hole in the ground or after the hole has been dug to a predetermined depth, the diameter of the diameter expanding device is expanded to make the diameter expanding blade protrude from the opening of the external casing to provide an expanded diameter section. An enlarged hole drilling method characterized by creating. (4) A knotted core such as a knotted pile or a reinforcing bar cage having a knotted part in an excavated hole having an enlarged diameter part formed by any of the enlarged diameter hole drilling method described in claim 1, claim 2, or claim 3. A diameter-expanding knot pile construction method characterized by matching the pitch of the diameter expanding devices provided in multiple stages on the auger shaft to the pitch of the knots of the knotted core material when inserting the material to form the diameter-expanding knot pile.