JP2000240055A - Pile driver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pile driver capable of driving a pile while sufficiently guaranteeing the bearing power of the tip of the pile and the frictional force of the peripheral face of the pile with cement milk injection reduced or unrequired. SOLUTION: This pile driver is provided with a leader 2, a drill tool 3 inserted into a pile (steel pipe pile K) having a hollow section, a rotating device (auger output device 4) vertically movable along the leader 2 and rotating the drill tool 3, a holding device (chuck device 5) vertically movable along the leader 2 and removably holding the pile (steel pipe pile K) or rocking the pile while holding it, and a pressing/extracting force applying means (pressing/ extracting cylinder 6) which is fixed to the rotating device (auger output device 4) at the upper end section, is fixed to the holding device (chuck device 5) at the lower end section and applies pressing or extracting force to the pile (steel pipe pile K).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an H-shaped steel pile for driving a steel pipe pile, a concrete pile or the like having a hollow portion, or using a casing having a hollow portion to prevent collapse of a hole wall. The present invention relates to a pile driving machine for driving a pile such as a pile.

[0002]

2. Description of the Related Art Among the conventional pile driving machines of this type, a type for driving a pile having a hollow portion is, for example, as shown in FIG. 6, a leader 101 and a steel pipe pile having a hollow portion. Drilling tool 102 inserted into K and leader 10
1 includes an auger output device 103 which is a rotatable device for rotating the excavating tool 102, and a swivel joint 104 having a double structure provided on an output shaft 103a of the auger output device 103. Are known.
The excavating tool 102 is composed of a screw rod 102a having a pipe with a double structure and a Noval hammer 102b as a rock drilling machine capable of freely expanding and contracting the outer diameter D of the tip bit.

According to this pile driving machine, pre-drilling using compressed air is performed at the tip bit of the Noval hammer 102b whose outer diameter D is set to be larger than that of the steel pipe pile K. The steel pipe pile K can be driven into the ground.

[0004]

However, in this pile driving machine, the steel pipe pile K is naturally settled in the hole while drilling a hole larger than the outer diameter D of the steel pipe pile K. However, there are inherently the following absurdities.

In other words, slime (hereinafter referred to as “slime”) such as drilling pits and earth and sand deposited on the bottom of the hole due to the casting of the steel pipe pile K hinders the tip of the steel pipe pile K from naturally sinking to the bottom of the hole. As a result, it is impossible to reach, and even if the ground at the bottom of the hole is strong, it is necessary to inject cement milk for consolidation to secure the supporting force at the tip of the steel pipe pile K. I will.

Further, since the steel pipe pile K is naturally settled by drilling a hole having an inner diameter larger than the outer diameter D of the steel pipe pile K, the ground around the steel pipe pile K may be strong. However, the frictional force on the peripheral surface of the steel pipe pile K can hardly be utilized, and in some cases, cement milk for filling the gap is required in the gap formed around the steel pipe pile K to secure the frictional force on the peripheral surface of the steel pipe pile K. turn into.

Further, even when cement milk for consolidation and possibly cement milk for filling gaps are injected, fragile portions and the slime are inevitable between the cement milk and the solid ground. Therefore, the injection force alone cannot sufficiently secure the supporting force at the tip of the steel pipe pile K or the frictional force of the peripheral surface of the steel pipe pile K.

Accordingly, an object of the present invention is to provide a pile driving method capable of driving a pile in which the supporting force at the tip of the pile and the frictional force on the peripheral surface of the pile are sufficiently secured while reducing or eliminating cement milk injection. To provide machines.

[0009]

To achieve the above object, according to the present invention, a pile driver according to a first aspect of the present invention includes a leader, a drilling tool inserted into a pile having a hollow portion, and a leader. A pivoting device that is movable up and down along with the excavating tool, and a gripping device that is movable up and down along the leader, and that swings while gripping the pile in a detachable manner and optionally gripping. And a press-in / pull-out force applying means for applying a press-in or pull-out force to the stake, the upper end being fixed to the rotating device and the lower end being fixed to the gripping device.

On the other hand, among the present invention, a pile driver according to a second invention is a leader, a casing having a hollow portion, a drilling tool inserted into the hollow portion, and is capable of moving up and down along the leader. A rotating device that rotates the excavating tool, a gripping device that is vertically movable along the leader, and that detachably grips the casing and swings while gripping the casing in some cases; And a press-in / pull-out force applying means for applying a press-in or pull-out force to the casing.

That is, the present invention provides, as a new component, a gripping device and a leader for detachably gripping and optionally swinging a pile or casing having the hollow portion in addition to the components of the conventional pile driver. By providing a pile driving machine including a press-in / pull-out force applying means for applying a press-in / pull-out force to the pile or casing while moving up and down along, supporting the tip of the pile while reducing or eliminating cement milk injection It is possible to drive a pile whose strength and frictional force on the pile surface are sufficiently secured.

In such technical means, the pile may be any one having a hollow part, for example, a steel pipe pile or a concrete pile, and if the casing has a hollow part. For example, a steel pipe or the like can be used when driving an H-shaped steel pile.

As the excavating tool, if it is possible to press-fit a pile using a gripping device and a press-fitting / pulling-out force applying means immediately after drilling, the type and configuration may be appropriately selected according to the application. Absent. For example, in a case where a steel pipe pile is applied to a solid ground such as a rock, a rock drill having a screw rod and a tip bit can be used, and a steel pipe serving as a casing is made of a soft material such as clay. In the case where the present invention is applied to the ground, a screw rod and a tip bit can be used.
In the case where a drilling tool including a rock drill is used, as long as the pile can be press-fitted or the like, the tip bit cannot be enlarged or reduced.

Further, the rotating device can be freely moved up and down along the leader and can rotate the excavating tool. It does not matter what the form of the driving force or the form of the transmission is. And can be selected appropriately.

[0015] However, when a configuration in which the swivel joint is provided on the rod to which the rotating power is transmitted is selected, the weight of the swivel joint and the length of the excavation tool are lengthened due to the necessity of securing the structural strength. This becomes a negative factor and disadvantageously increases the size of the base machine.

Therefore, as the rotating device, a housing suspended vertically so as to be movable along the reader,
An output shaft that is rotatably supported in the direction along the reader in the housing and has a dual-structure pipe line, and a motor that is fixed in the housing and applies a rotational force to the output shaft. And a swivel joint having a double structure provided in a portion above the portion of the output shaft to which a rotational force is applied by the motor.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on embodiments shown in the accompanying drawings. FIG. 1 is a side view schematically showing a pile driver according to one embodiment of the present invention, and FIG. 2 is a front view (FIG. 2A) and a side view schematically showing an attachment mounted on the pile driver. (FIG. 2B).

In these figures, reference numeral 1 denotes a rough terrain crane, which is a base machine having a boom 1b at the tip end of which a bracket 1a is swingably hung, and reference numeral 2 denotes a vertical machine having a top fixed to the bracket 1a. It is a standing leader.

Reference numeral 3 denotes a steel pipe pile K having a hollow portion.
Drilling tool inserted into the This drilling tool 3
Screw rod 2 having conduit 32b having a double structure
1 and a tip bit 22a, and a Noval hammer 22, which is a rock drilling machine for drilling using compressed air. In the present embodiment, the Noval hammer 22 of the type that cannot expand and contract the tip bit is used. However, the present invention is not limited to this, and the Noval hammer 22 of the type that can expand and contract the tip bit can be used according to the construction method and the like. .

Reference numeral 4 denotes an auger output device which is vertically movable on a leader guide 2a of the leader 2 and serves as a rotation device for rotating the excavating tool 3. Reference numeral 5 denotes a leader guide 2a of the leader 2. Is a chuck device that is a holding device that can vertically move up and down, and that detachably holds and swings the steel pipe pile K while holding. The chuck device 5 has a discharge port 5a for discharging the slime conveyed to the top of the steel pipe pile K while holding the steel pipe pile K to the outside.

Further, reference numeral 6 indicates that the base end of the cylinder body 6a, which is the upper end, is fixed to the auger output device 4, and the distal end of the cylinder rod 6b, which is the lower end, is fixed to the chuck device 5. And a pair of press-in / pull-out cylinders serving as press-in / pull-out force applying means for applying a press-in or pull-out force to the cylinder.

Reference numeral 7 denotes a compressor for supplying compressed air to the Noval hammer 22, reference numeral 8 denotes an oiler for supplying lubricant to the Noval hammer 22, and reference numeral 9
Is a cement milk supply apparatus for producing cement milk for consolidation by kneading cement and water, and for pumping the produced cement milk through the swivel joint 34 and the screw rod 21 to the tip bit 22a, reference numeral 10
Is a slime box installed near the pile driver and accumulating slime discharged from the discharge port 5a through the hose 10a.

That is, the pile driver according to the present embodiment is an attachment attached to a rough terrain crane 1 and a boom 1b of the rough terrain crane 1, and includes a leader 2, a drilling tool 3, an auger output device 4, a chuck device. 5 and a press-in / pull-out cylinder 6 and auxiliary equipment for securing the function of the attachment, comprising a compressor 7, an oiler 8, a cement milk supply device 9, and a slime box 10.

In this embodiment, the auger output device 4
As shown in FIGS. 2 and 3, a housing 31 suspended vertically above and below a leader guide 2 a of the leader 2, and a bearing 32 in the housing 31.
The output shaft 32 has a double-structured conduit 32b which is rotatably supported upright in a direction along the reader 2 via a.
And a motor 33 fixed in the housing 31 and applying a rotational force to the output shaft 32, and a portion of the output shaft 32 to which the motor 33 applies the rotational force (rotational force transmitting portion 32c)
And a swivel joint 34 having a double structure provided in an upper portion.

As shown in FIG. 3, the swivel joint 34 comprises a swivel part 34a for grout and a swivel part 34b for air. On the other hand, the swivel part 34a for grout is provided integrally with the housing 31 for grout. On the other hand, an air swivel portion 34b is provided integrally with the housing 31 and communicates with an air port 42 which communicates with the compressor 7. From the grout port 41, in addition to cement milk for consolidation, water for frictional heat cooling generated in the tip bit 22a and a bentonite stabilizer for preventing pore wall collapse are supplied. 2
2, the compressed air required for the impact operation is supplied.

The chuck device 5 is shown in FIGS.
And as shown in FIG. 5, the leader guide 2 of the leader 2
a is vertically movable up and down, and a steel pipe pile K is rotatably supported by a swivel bearing 51 into which the steel pipe pile K is to be rotatably inserted, and the steel pipe pile K is rotatably inserted. A turning body 52 to be rotated, a chuck cylinder 53 provided integrally with the turning body 52 and holding the steel pipe pile K at appropriate timings using teeth 53a from three directions, and a tip end portion rotatably connected to the turning body 52. It comprises a cylinder rod 54a and a cylinder body 54b whose base end is fixed to the swivel bearing 51, and a swing cylinder 54 for swinging the swivel body 52 right and left with a predetermined stroke.

Next, the operation of the pile driver according to the present embodiment will be described with reference to FIGS. 1 and 2, and in some cases with reference to FIGS. Hereinafter, (1) steel pipe pile mounting step, (2) steel pipe pile driving step, and (3) cement milk injection step will be described separately.

(1) Steel Pipe Pile Mounting Process The present pile driving machine now has a steel pipe pile K to be driven and a drilling tool 3.
Has not been installed yet,
In such a state, a steel pipe pile mounting step of mounting the steel pipe pile K and the excavating tool 3 to the pile driver is performed.

First, a steel pipe pile K to be cast is placed horizontally on the ground by a crane (not shown) prepared separately from the rough terrain crane 1, and then the excavating tool 3 is placed in the hollow portion of the horizontally placed steel pipe pile K. Insert the steel pipe pile K until the top is projected.

Subsequently, the steel pipe pile K and the excavation tool 3 whose top is held in a protruding state from the steel pipe pile K are lifted up by a crane, and as soon as they are vertical, the steel pipe pile K and the excavation tool 3 are immediately moved to the vicinity of the pile driver. Land on. Then, steel pipe pile K
The excavating tool 3 whose top is protruded from the steel pipe pile K is placed vertically on the ground.

Above the steel pipe pile K and the excavating tool 3 in such a state, the rough terrain crane 1 is turned to mount the steel pipe pile K on the leader 2 of the pile driving machine with respect to the position of the axis of the steel pipe pile K. The position of the axis of the output shaft 32 of the auger output device 4 is adjusted.

Thereafter, when the auger output device 4 and the chuck device 5 are lowered on the leader guide 2a of the leader 2 by the rough terrain crane 1, the steel pipe pile K is moved relative to the revolving main body 52 and the revolving bearing 51 of the chuck device 5 which is lowered. And is rotatably inserted.

Subsequently, when the chuck cylinder 53 of the swing bearing 51 is extended, the teeth 53a of the chuck cylinder 53 are extended.
As a result, the portion of the steel pipe pile K related to the turning main body 52 is gripped (see FIGS. 4 and 5), thereby ending the steel pipe pile mounting step.

(2) Steel Pipe Pile Driving Step Next, a steel pipe pile driving step of driving a steel pipe pile K mounted on the main pile driving machine is performed.

First, when compressed air is supplied to the Noval hammer 22 of the excavating tool 3 by the compressor 7, the tip bit 22a of the Noval hammer 22 strikes the ground.

Then, on the one hand, the tip bit 22
The ground that has been hit by the a is drilled. On the other hand, the slime generated by the hitting operation of the tip bit 22a is conveyed to the top of the steel pipe pile K by the action of the screw and the compressed air in the region between the inner wall of the steel pipe pile K and the outer periphery of the screw rod 21. Thereafter, the slime is accumulated inside the slime box 10. As a result, a hole smaller than the outer diameter of the steel pipe pile K is formed in a region related to the lower end of the steel pipe pile K.

Subsequently, when the pair of press-fitting / pulling cylinders 6 is extended at an appropriate timing, the press-fitting / pulling-out cylinder 6 takes a reaction force from the auger output device 4 integrated with the excavating tool 3 and passes through the steel pipe pile through the chuck device 5. A press force is applied to K. Then, the steel pipe pile K is pressed into a hole smaller than the outer diameter of the steel pipe pile K.

The tip bit 2 of the Noval hammer 22
The striking operation on the ground by 2a and the press-fitting operation of the steel pipe piles K by the pair of press-fitting / pulling-out cylinders 6 are repeatedly performed at appropriate timing in an overlapping manner, whereby the steel pipe piles K are continuously driven.

Here, there is a concern that the driving depth of the steel pipe pile K may be increased and the frictional force on the peripheral surface may be excessive, resulting in a situation in which neither press-fitting nor pull-out is possible.

However, in the present embodiment, a pair of oscillating cylinders 54 for enabling the steel pipe pile K to perform a rocking operation in parallel with the press-fitting operation of the steel pipe pile K by the pair of press-fitting / pulling-out cylinders 6 is provided. Equipped with steel pipe pile K at appropriate timing
It can be considered that there is almost no situation where the frictional force on the peripheral surface of the steel pipe pile K becomes excessive and the press-fitting and pulling-out cannot be performed.

Then, when the placing of the steel pipe pile K to the predetermined depth is completed, the steel pipe pile placing step is ended. At the end of this step, the hole drilled by the Noval hammer 22 is finished to be slightly shallower than a predetermined depth, and after that, the steel pipe pile K is press-fitted to the predetermined depth by the pair of press-fitting extraction cylinders 6. Thereby, the tip portion of the steel pipe pile K can be reliably reached to the solid ground, which contributes to securing the tip support force of the steel pipe pile K.

(3) Cement Milk Injection Step Lastly, the steel pipe pile K which has been driven into the ground in the steel pipe pile driving step
A cement milk injecting step of injecting cement milk for consolidating the tip is performed.

That is, by the cement milk supply device 9,
When cement milk for rooting is manufactured and the cement milk is injected from the tip bit 22a through the swivel joint 34 and the screw rod 21 (see FIG. 2), the tip of the steel pipe pile K is rooted after the curing period, and the steel pipe pile K The supporting force at the tip is secured.

Therefore, according to the pile driving machine according to the present embodiment, while the steel pipe pile K is being gripped by the chuck device 5, a press-fit is applied by the press-fitting / pulling-out cylinder 6, and in some cases, the steel pipe pile K is rocked. As a result, it was possible to drive a pile in which the supporting force at the tip of the steel pipe pile K and the frictional force on the peripheral surface of the steel pipe pile K were sufficiently ensured. Therefore, not only is it unnecessary to inject cement milk for securing frictional force to secure the frictional force on the peripheral surface of the steel pipe pile K, but also to inject cement milk for consolidation to secure the supporting force at the tip of the steel pipe pile K. Can be greatly reduced compared to the case using a pile driver.

In this embodiment, the steel pipe pile K gripped by the chuck device 5 is driven as it is.
However, the present invention is not limited to this. For example, it is also possible to drive a separate pile such as an H-shaped steel pile while using the steel pipe gripped by the chuck device 5 as a casing.

However, this case differs from the pile driver according to the present embodiment in that the steel pipe serving as the casing is a component of the pile driver. Therefore, the operation,
The effect will be slightly different.

That is, even after the press-in or pull-out of the steel pipe as the casing is completed, similar to the case of the steel pipe pile K described above, since the surrounding ground is not disturbed, slime may accumulate at the bottom of the hole. Fragile parts hardly occur. Therefore, the solid ground which is strong at the bottom of the hole can be exposed, and as a result, the supporting force at the tip of the H-shaped steel pile can be sufficiently secured. This also makes it possible to significantly reduce the injection of cement milk for consolidation, which is necessary to secure the supporting force at the tip of the H-shaped steel pile.

In the present embodiment, the effect of reducing cement milk injection is obtained only. However, it is of course possible to obtain the effect of not requiring cement milk injection depending on the soil condition and the use of piles. It is.

[0049]

According to the pile driving machine of the present invention, the construction as described above reduces or eliminates the need to inject cement milk, while sufficiently ensuring the support force at the tip of the pile and the frictional force on the peripheral surface of the pile. It is possible to drive the pile.

[Brief description of the drawings]

FIG. 1 is a side view schematically showing a pile driver according to one embodiment of the present invention.

FIG. 2 is a front view (FIG. 2 (a)) and a side view (FIG. 2 (b)) schematically showing an attachment mounted on the pile driver according to one embodiment of the present invention.

FIG. 3 is a side sectional view showing an auger output device which is a component of the pile driver according to one embodiment of the present invention.

FIG. 4 is a plan sectional view showing a chuck device as a component of the pile driver according to one embodiment of the present invention.

FIG. 5 is a side sectional view showing a chuck device as a component of the pile driver according to one embodiment of the present invention.

FIG. 6 is a side view schematically showing a conventional pile driver.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Rough terrain crane 1a ... Bracket 1b ... Boom 2 ... Leader 2a ... Leader guide 3 ... Drilling tool 4 ... Auger output device (rotating device) 5 ... Chuck device (gripping device) 5a ... Discharge port 6 ... Press-in / pull-out cylinder 6a ... Cylinder body 6b Cylinder rod 7 Compressor 8 Oiler 9 Cement milk supply device 10 Slime box 10a Hose 21 Screw rod 22 Noval hammer 22a Tip bit 31 Housing 32 Output shaft 32a Bearing 32b Pipe line Reference numeral 32c: rotational force transmitting unit 33: motor 34: swivel joint 34a: grout swivel unit 34b: air swivel unit 41: grout port 42 ... air port 51 ... swivel bearing 52 ... swivel body 53 ... chuck cylinder 53a ... tooth 54 ... Acting cylinder 54a ... cylinder rod 54b ... cylinder body 101 ... reader 102 ... Drilling tools 102a ... screw rod 102b ... Nobaruhanma 103 ... auger output device (rotating device) 103a ... Output shaft 104 ... Swivel joint K ... steel pipe D ... outer diameter

Claims (3)

[Claims] 1. A leader, a drilling tool inserted into a stake having a hollow portion, a rotating device capable of moving up and down along the leader, and rotating the drilling tool; and a lifting device capable of moving up and down along the leader A gripping device that grips the pile detachably and swings while gripping the pile in some cases, and an upper end portion is fixed to the rotating device and a lower end portion is fixed to the gripping device. And a press-in / pull-out force applying means for applying a press-in / pull-out force. 2. A leader, a casing having a hollow portion, an excavating tool inserted into the hollow portion, a rotating device that can move up and down along the leader and rotates the excavating tool, and the reader. A gripping device that can be lifted and lowered along and that swings while gripping the casing in a detachable manner, and in some cases, an upper end portion is fixed to the rotating device and a lower end portion is fixed to the gripping device. And a press-in / pull-out force applying means for applying a press-in / pull-out force to the casing. 3. The rotating device according to claim 1, further comprising: a housing suspended to be able to move up and down along the leader; and a pipe having a double structure supported rotatably in a direction along the leader in the housing. An output shaft having: a motor fixed in the housing, for applying a rotational force to the output shaft; and a double provided in a portion above the output shaft portion, to which the rotational force is applied by the motor. The pile driver according to claim 1 or 2, comprising a swivel joint having a structure.