JP2004003123A - Concrete pile driving method, concrete pile, and its driving device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a concrete pile driving method through which a concrete pile is put in ground 5 and bedrock 5', easily and deeper in design without generating excavated surplus soil. <P>SOLUTION: A concrete pile 2 is inserted in a casing 1. The outer peripheral flange 3' of the lower end closing plate 3 of the concrete pile 2 and the lower end part of the casing 1 are detachably and supportedly engaged with each other in the normal rotation. Ground 5 is cut by a cutting blade 4 equipped at the lower end closing plate 3 face and the pile 2 is propelled together with the casing 1. Subsequently, the casing 1 is reversed and disengaged from the flange 3'. Then, only the casing 1 is lifted up to the ground. The concrete pile 2 is left in the ground 5 and embedded therein. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a field in which a concrete pile is poured into the ground without generating residual soil to improve the proof strength of a buried pile.
[0002]
[Prior art]
Conventionally, spoke-shaped blades are provided on the bottom surface of the bottom plate of a short cylinder, the lower end of a concrete pile is fitted into the short cylinder, a small-diameter rotary shaft is inserted into the concrete pile, and the lower end of the rotary shaft and the upper surface of the bottom plate are connected. A method of engaging a short shaft provided on a short cylinder and rotating the short cylinder with a rotating shaft, and propelling and embedding a concrete pile in the ground from the short cylinder has been performed.
[0003]
However, according to this method, a rotating force is applied to the lower end of the concrete pile, and when the depth of propulsion burial of the concrete pile is increased, a torsional stress is generated in the pile, that is, the long axis, thereby causing cracks, reducing the burial depth, and reducing the clay layer There was a problem that it was difficult to propel into the rock, or it was difficult to pull up and recover from the ground after the propulsion accident, and it was propelled by the spinning of the cutting part at the inclined boundary between the rock and the ground. There was a problem that curvature was easily generated.
[0004]
[Problems to be solved by the invention]
The present invention reduces the torsional stress due to non-contact between the concrete pile and the ground or the rock, and facilitates propulsion into the clay layer or the rock, increases the burial depth without generating excavated soil, and uses the spin due to the influence of the hard rock. It is an object of the present invention to provide a concrete pile placing method, a concrete pile and a placing device thereof, which have a small propulsion curve and can be easily pulled up in the case of an accident.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the present invention firstly inserts a concrete pile into a casing, and detachably engages the outer peripheral flange portion of a lower end closing plate of the concrete pile with the lower end portion of the casing in a forward rotation direction. Supported, the concrete pile is normally rotated by the normal rotation of the casing, the ground is cut by a cutting blade provided on the lower surface of the lower end closing plate, and the ground is propelled together with the casing. Disengagement, raise only the casing to the ground, and leave the concrete pile buried in the ground, concrete pile placing method,
Secondly, the concrete pile casting method according to the first aspect of the present invention, wherein the ground is precut by the downward cutting blade along the outer periphery of the cutting by the cutting blade.
Third, the concrete pile casting method according to the first or second invention, wherein water is poured into the cutting portion from inside the concrete pile and / or between the concrete pile and the casing to cut and promote the ground.
Fourthly, cement milk is poured between the concrete pile and the casing and / or into the concrete pile to form a soil cement portion on the lower surface, outer periphery of the closing plate and the outer periphery of the concrete pile. Concrete pile casting method described in
Fifth, a lower end closing plate larger than the outer diameter of the pile is fixed to the lower end of the concrete pile to form an outer peripheral flange portion, a female groove for engagement is provided in the flange portion, and a downward facing central portion of the lower surface of the lower end closing plate. A concrete pile provided with a plate-shaped blade, and a curved spoke-shaped blade extending from both ends or both sides of the downward plate-shaped blade to the outer periphery of the closing plate on the lower surface of the closing plate;
Sixth, the concrete pile according to the fifth aspect of the present invention, wherein a downwardly facing cutting edge is provided at the outer end of the curved spoke-shaped blade.
Seventh, the concrete pile according to the fifth or sixth invention, wherein a water injection through hole communicating with the inside and outside of the pile is formed in the closing plate, and a check valve is provided outside the through hole.
Eighth, the concrete pile according to any one of the fifth to seventh inventions, and a casing having an inner diameter larger than the outer diameter of the concrete pile, wherein an engaging male plate protruding from a lower end portion of the casing and an outer peripheral flange portion are provided. A concrete pile driving device formed so that the formed female groove for engagement is engaged with the male and female by forward rotation of the casing and separated by the reverse rotation.
Ninth, the concrete pile driving apparatus according to the eighth invention, wherein a female groove for reverse rotation engaging the male and female by further reversing the male and female separating portion is formed in the outer peripheral flange portion.
Tenth, the eighth or ninth embodiment wherein a concave step is formed on the outer inner periphery of the water injection through hole, a check valve fitted to the concave step is attached, and a small drainage groove is formed inside the check valve. Concrete pile driving device according to the invention,
Eleventh, the concrete pile driving device according to any one of the eighth to tenth inventions, wherein a spiral strip formed by a strip is provided on the outer periphery of the casing.
It is constituted by.
[0006]
BEST MODE FOR CARRYING OUT THE INVENTION
Steel rings 2 ', 2' for connection are generally provided at the upper and lower ends of the concrete pile 2.
[0007]
A lower end closing plate 3 larger than the outer diameter of the pile 2 is welded and fixed to the steel ring 2 'provided at the lower end to form an outer peripheral flange portion 3'.
[0008]
The arc-shaped fittings 14, 14 having the engaging female grooves 12, 12 'formed in the forward and reverse directions at the upper surface symmetric position of the flange portion 3' are fixed by welding.
[0009]
On the lower surface of the closing plate 3, a downward plate-like blade 7 shown in FIG. 7A or FIG. (A) The figure is flat blade and suitable for soft ground, and (b) the figure is suitable for rock cutting with multiple angled blades. (E) is a transverse sectional view of the downward plate blade 7 with both ends 7 ′, 7 ′ bent in the direction opposite to the rotation direction a along the line (A) CC in FIG.
[0010]
As shown in FIG. 3, curved spoke-shaped blades 8, 8 which reach the outer periphery of the closing plate 3 or slightly protrude outward from the outer periphery are provided on both ends or both side portions of the downward plate-like blade 7. Weld to the bottom. When the downward plate-like blade 7 is provided obliquely with the position of the solid line as shown by the imaginary line in FIG. 3, both ends of the spoke-like blades 8 are provided on both sides of the downward plate-like blade 7.
[0011]
As shown in FIG. 7 (c), the spoke-shaped blade 8 has a one-sided surface 8 'on the convexly curved side facing the rotation direction, and forms an inclined surface 8 "on the back surface thereof. As shown in FIGS. 7 (c) and (d), an acute groove .theta. Is formed between the bottom plate 3 and the lower surface of the outer peripheral flange portion 3 'from the center of the bottom plate 3 to the outer end of the flange portion 3'.
[0012]
At the outer ends of the curved spoke-shaped blades 8, 8, downward cutting blades 8a, 8a protrude along the rotation circumference of the spoke-shaped blades 8, 8, as shown in FIGS. Simultaneously or slightly after the rotary cutting by the plate-shaped blade 7, the ground 5 or the rock 5 'is circumferentially cut along the circumference, and the spoke-shaped blade is provided between the cut and the downward plate-shaped blade 7. 8. Cut by 8.
[0013]
The ground 5 or the bedrock 5 'is cut by the rotation of the spoke-shaped blade 8 in the a direction, and the cutting chips move toward the outer periphery of the closing plate 3 along the one cutting surface 8', and the cutting inner peripheral wall 15 (FIG. 2). Rise along.
[0014]
A plurality of curved spoke-shaped blades 8 are provided, such as two (FIG. 3), three (FIG. 12) and four (FIGS. 9 and 10), and the number is not limited. As shown in FIGS. 13 (a) and 13 (b), the upper and lower layers 8 ′ and 8 ″ are fixed by small bolts b, and the lower layer 8 ′ is made of hard metal to correspond to the hardened rock 5 ′. it can.
[0015]
At the center of the closing plate 3, a water injection through hole 9 communicating with the inside and outside of the pile 2 is formed, and the outside (lower side) of the through hole 9 is as shown in FIGS. The illustrated rubber check valve 10 is provided.
[0016]
The concrete casing 2 formed as described above is fitted with the steel casing 1 having an inner diameter slightly larger than its outer diameter.
[0017]
At the lower end of the casing 1, a small-width flange 1 'is provided, and sector-shaped engaging male plates 11, 11 are projected at symmetrical positions of the flange 1', and the casing 1 is rotated forward in the direction of FIG. , 11 are engaged with the engaging female grooves 12, 12 of the metal fittings 14, 14 formed on the upper surface of the outer peripheral flange portion 3 'provided on the pile 2 side (the state is shown in FIG. 4).
[0018]
When the casing 1 is rotated in the reverse direction (in the direction opposite to the direction b), the fan-shaped engaging male plates 11, 11 rotate to the intermediate position W of the metal fittings 14, 14 to separate the male and female engagement.
[0019]
In the above separated state, the casing 1 can be raised and the concrete pile 2 can be buried in the ground.
[0020]
When the casing 1 is further rotated in the reverse direction from the separation position (intermediate position W), the fan-shaped male plates 11, 11 are engaged with the other female grooves 12 ', 12' of the metal fittings 14, 14 respectively.
[0021]
In the case of an excavation promotion accident, the casing 1 and the concrete pile 2 can be pulled out to the ground by a wire rope / winding machine by rotating the casing 1 in the direction opposite to the arrow b.
[0022]
The check valve 10 has a concave step 9 ′ formed on the inner periphery of the outside of the through hole 9, a rubber check valve 10 fitted to the concave step 9 ′ is mounted, and drainage is provided inside the check valve 10. A small groove 9 "can be formed to allow water to leak into the ground after the check valve 10 is closed.
[0023]
A spiral strip 13 is formed on the outer periphery of the casing 1 by a band plate. When the clay layer is propelled, the adhesion of the clay to the outer peripheral surface of the casing 1 is cut to reduce frictional resistance due to the clay.
[0024]
Instead of the metal fittings 14 and the fan-shaped male plates 11 and 11, a plurality of engagement grooves (through-hole grooves) 12 "are formed in the outer peripheral flange 3 'as shown by phantom lines in FIG. A plurality of L-shaped fittings 11 ′ projecting downward from the lower end of the housing are inserted into the grooves 12 ″, and in this state, the casing 1 is rotated forward and reverse to move the outer peripheral flange 3 ′ and the concrete pile 2 forward. The L-shaped fitting 11 ′ can be rotated in the reverse direction and separated from the engaging groove 12 ″, and the engaging groove 12 ″ is drawn into the engaging groove 11 ″ formed in the L-shaped fitting 11 ′ by reverse rotation. The casing 1 and the concrete pile 2 can be simultaneously pulled up to the ground by engaging the outer peripheral flange 3 ′ with the casing 1.
[0025]
Therefore, the concrete pile 2 is inserted into the casing 1 as shown in FIGS. 1 (a) to (c), FIGS.
The outer peripheral flange 3 ′ of the lower end closing plate 3 of the concrete pile 2 and the lower end of the casing 1 are detachably engaged with and supported in the forward rotation direction (arrow b),
By rotating the casing 1 forward by the prime mover 16, the concrete pile 2 is rotated forward, and the cutting blade 4 provided on the lower surface of the lower end closing plate 3, that is, the downward plate blade 7 and the curved spoke blade 8, and the ground 5 The bedrock 5 ′ is cut and propelled downward together with the casing 1.
[0026]
The prime mover 16 engages with the leader 20 of the guide 19 and slides downward, and lowers the casing 1 by winding the wire rope 21 hanging from the prime mover 16 downward on the winding machine 22.
[0027]
After reaching the design depth, the casing 1 is reversed to release the engagement with the outer peripheral flange portion 3 ′, and only the casing 1 is raised to the ground by a wire rope / winding machine.
Thus, the concrete pile 2 is buried in the ground 5.
[0028]
During the propulsion, water or air is supplied from the nozzle 17 to the inside of the concrete pile 2 (FIG. 1 (c)), and / or water or air is supplied between the casing 1 and the pile 2 from the nozzle 17 'on the upper part of the casing 1. Then, water or air is supplied through the check valve 10 to the ground cutting portion by the plate-like blade 7 or the spoke-like blade 8 or the like, thereby facilitating the cutting of the ground 5 or the rock 5 ′.
[0029]
When water injection or air supply is stopped by propelling to the design depth (FIG. 1 (d)), the check valve 10 is closed, and the water 18 in the pile 2 is drained into a small drainage groove formed inside the check valve 10. 9 "leaks into the ground and the water in the pile 2 is discharged.
[0030]
Thereafter, cement milk is injected between the concrete pile 2 and the casing 1 from the upper nozzle 17 'of the casing 1, and a soil cement portion 6 is formed on the lower surface cut portion of the closing plate 3, the outer periphery thereof, and the outer periphery of the concrete pile 2. 1 (d) and (e) to form the root consolidation portion 6 '.
[0031]
Thereafter, the casing 1 and the motor 16 are pulled up to the ground by a wire rope / winding machine on the ground, and the concrete pile 2 is buried underground (FIGS. 1 (e) and 1 (c)).
[0032]
In FIG. 7D, a slope is formed at the lower edge of the curved spoke-shaped blade 8 so that the blade 8 can be formed sharply. FIG. 11 (b) FIG. 8a 'shows a double cutting edge 8a, but a single cutting edge may be used. 7 (a) and 7 (b), reference numeral 7 'denotes a hollow portion for the water injection hole 9 of the downward plate-like blade 7. 17 "is a vent hole.
[0033]
【The invention's effect】
Since the present invention is based on the above-described casting method, concrete pile, and its placing apparatus, not only the ground but also the rock can be easily cut, the design depth is deep, and the slope boundary between the rock and the ground (FIG. 1 (b)) As shown in Fig.) Etc., there is little curvature due to spin, so it can be set safely and not only can be buried reliably, but also it does not generate excavated soil,
The buried concrete pile has an outer peripheral flange portion, and has an effect of enhancing the lateral load and pull-out resistance of the concrete pile.
[Brief description of the drawings]
BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1A to 1F are explanatory views of a casting step according to the present invention.
FIG. 2 is a longitudinal sectional view of a propulsion state.
FIG. 3 is a bottom view of FIG. 2;
FIG. 4 is a cross-sectional plan view taken along the line AA of FIG. 2;
FIG. 5 is an exploded perspective view of a casing and a concrete pile.
FIG. 6A is a bottom view of the check valve.
(B) is a side view of (a) viewed from the right.
(C) The figure is an enlarged longitudinal sectional view of the check valve.
FIG. 7A is a front view of a downward plate blade.
(B) The figure is a front view of the angled downward plate-shaped blade.
FIG. 3C is a longitudinal sectional view taken along the line B-B of FIG.
(D) is a longitudinal sectional view taken along the line BB in a state where the bottom surface of (c) is inclined.
(E) is a cross-sectional view of an example of the downward plate-like blade along the line CC in (A) of FIG.
FIG. 8 is a front view of another embodiment of the lower end of the casing.
FIG. 9 is a bottom view provided with a downward cutting blade.
FIG. 10 is a perspective view of FIG. 9;
FIG. 11A is a side view of a downward cutting blade.
(B) The figure is a cross-sectional view of the downward cutting edge.
FIG. 12 is a bottom view of a lower end closing plate in which the cutting blade is three curved spoke-shaped blades.
FIG. 13 (a) is a partial perspective view of FIG. 12 in which a curved spoke-shaped blade has two layers, upper and lower.
(B) is a longitudinal sectional view taken along line DD in (a).
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Casing 2 Concrete pile 3 Lower end closing plate 3 'Outer peripheral flange part 4 Cutting blade 5 Ground 6 Soil cement part 7 Downward plate-like blade 8 Curved spoke-like blade 8a Downward cutting blade 9 Water injection hole 9' Recessed step 9 "Drainage Small groove 10 check valve 11 engaging male plate 12 engaging female groove 12 ′ reverse engaging female groove W

Claims (11)

Insert the concrete pile into the casing,
The outer peripheral flange portion of the lower end closing plate of the concrete pile and the lower end portion of the casing are detachably engaged and supported in the forward rotation direction,
Forward rotation of the concrete pile by forward rotation of the casing, cutting the ground by a cutting blade provided on the lower surface of the lower end closing plate, and propelled together with the casing,
Thereafter, the casing is reversed to release the engagement with the flange portion, and only the casing is raised to the ground,
A concrete pile casting method, wherein the concrete pile is buried in the ground. 2. The method according to claim 1, wherein the ground is cut in advance by a downward cutting blade along the outer periphery of the cutting by the cutting blade. The method according to claim 1 or 2, wherein water is poured into the cutting portion from inside the concrete pile and / or between the concrete pile and the casing to cut and promote the ground. The concrete pile according to any one of claims 1 to 3, wherein cement milk is poured between the concrete pile and the casing and / or into the concrete pile to form a soil cement portion on a lower surface, an outer periphery of the closing plate, and an outer periphery of the concrete pile. Casting method. A lower end closing plate larger than the outer diameter of the pile is fixed to a lower end of the concrete pile to form an outer peripheral flange portion,
A female groove for engagement is provided in the flange portion,
A downward plate-shaped blade is provided at the center of the lower surface of the lower end closing plate,
A concrete pile having curved spoke-shaped blades extending from both end portions or both side portions of the downward plate-shaped blade to the outer periphery of the closing plate on the lower surface of the closing plate. 6. The concrete pile according to claim 5, wherein a downward cutting edge is provided at an outer end of the curved spoke-shaped edge. 7. The concrete pile according to claim 5, wherein a water injection through hole communicating with the inside and outside of the pile is formed in the closing plate, and a check valve is provided outside the through hole. A concrete pile according to any one of claims 5 to 7, and a casing having an inner diameter larger than the outer diameter thereof,
A concrete pile driving device formed so that a male engaging plate protruding from a lower end of a casing and a female engaging groove formed in an outer peripheral flange portion are engaged in male and female by forward rotation of the casing, and are separated by reverse rotation. . 9. The concrete pile driving device according to claim 8, wherein a female groove for reverse rotation engaging the male and female by further reverse rotation is formed on the outer peripheral flange portion with the male and female separating portion interposed therebetween. The concrete pile according to claim 8 or 9, wherein a concave step is formed on the outer inner periphery of the water injection hole, a check valve fitted to the concave step is mounted, and a small drainage groove is formed inside the check valve. Casting equipment. The concrete pile driving device according to any one of claims 8 to 10, wherein a spiral strip formed by a band plate is provided on an outer periphery of the casing.

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