JP2000282468A - Pile driving device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately erect a pile in a predetermined position in a hole excavated by an auger. SOLUTION: In this pile driving device by which a pile whose upper portion is fitted into a pile fixing cap 58 secured to the lower portions of hanging tongs 20 is driven into an auger-excavated hole by lowering the tongs 20 along a leader 1, guide members 70, 44 are provided respectively at the tongs 20 and the leader 16 in such a way as to extend vertically. An engaging member 72 which is vertically movable when fitted over both guide members 70, 44 is provided. The tongs 20 connected to the leader 16 by means of the engaging member 72 are vertically guided by the guide members 70, 44.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pile driving device, and more particularly, to a pile driving device capable of accurately laying a pile at a predetermined position in an auger excavation hole.

[0002]

2. Description of the Related Art As is well known, in the construction of buildings and civil engineering structures, piles such as ready-made concrete piles and steel piles are placed at predetermined positions on the ground as part of the foundation work. Pile foundation work is being carried out, such as burying or embedding. One of various methods proposed as a construction method used in such a pile construction work is to add a root consolidation liquid to a tip of a drill hole (vertical hole) formed in advance by auger drilling. Inject cement milk and build piles, so-called,
There is a cement milk method.

[0003] By the way, in pile construction work using such a cement milk method, a pile driving device is usually used when a pile is built in an excavation hole. The lower part has a yatco that enables the upper part of the pile to be fixed, and a leader (tower) that stands upright in a state of extending in the vertical direction (vertical direction) with respect to the ground, and the lower part has the pile fixed. There is known a pile driving device in which a pile is suspended in a predetermined excavation hole by suspending the lowered yoke and lowering it along the leader. Thus, this pile driving device has a feature that the pile can be built at a depth where the upper surface of the pile is lower than the ground surface by inserting the yatco into the excavation hole together with the pile. It is widely used, especially when building piles at such a depth, but in such a pile driving device,
There were serious problems inherent.

[0004] That is, when carrying out the pile ground business by the cement milk method as described above, the inside diameter of the auger drilling hole is made larger than the outside diameter (pile diameter) of the pile to be built by a notification from the Minister of Construction. While making it larger by a predetermined amount,
It is required that the pile be built concentrically into such a drilling hole, so that the cement milk is evenly distributed over the entire circumferential direction between the side wall surface of the drilling hole and the outer peripheral surface of the pile. It is necessary to build a pile so that it can be introduced, but in the pile driving device as described above, the place where the yatco is simply suspended by a wire is used. Therefore, it is inevitable that the yatco rocks like a pendulum with the installation work, and therefore, the pile fixed to the lower part of such a yatco has its axial direction with respect to the axial direction of the drill hole. It will be built in an inclined state or its center deviated from the center of the drill hole, so that the cement milk cannot be introduced uniformly around the pile, or Because so that the collapse of the side wall is caused, a required supporting force of the pile is of the thus buildings and durability of civil engineering structures and earthquake resistance, etc., there is a problem such as sufficiently longer obtained to secure.

[0005]

Here, the present invention has been made in view of such circumstances, and a problem to be solved is, in particular, a pile embedding work in a pile foundation work by a cement milk method. It is an object of the present invention to provide a pile driving device that can be used to build a pile accurately at a predetermined position in an excavation hole of an auger.

[0006]

According to the present invention, in order to solve such a problem, a suspended yatco is lowered along a leader, so that a pile fixing cap fixed to a lower portion of the yatco is provided. In a pile driving device for laying a pile having an upper part fitted thereinto in an excavation hole formed by an auger, a guide member is provided so as to extend in a vertical direction on both the yatco and the leader, and the guide members are fitted to both guide members, respectively. And providing an engaging member movable in the up-down direction so that the yoke is guided in the up-down direction by the guide member in a state of being connected to the leader by the engaging member. The gist is a pile driving device characterized by the following.

That is, in the pile driving device according to the present invention, in both the yatco and the leader, the engaging member moves in the vertical direction with respect to each of the guide members provided to extend in the vertical direction. It is fitted so that it can be guided up and down under the condition that it is connected to the leader via the engaging member. In short, in the device of the present invention, the yatco is movable in the vertical direction (vertical direction) with respect to the reader, but is not displaced in the horizontal direction. It can exhibit the characteristic that it can be raised and lowered accurately along the reader without any swinging.

Therefore, if such a pile driving device according to the present invention is used in pile pile work in pile ground construction work by the cement milk method, for example, the pile fitted into the pile fixing cap at the lower part of the yatco will be: It can be accurately built at a predetermined position in the borehole without inclination or deviation from the central axis of the auger borehole having an inner diameter larger than the pile diameter. Thereby, between the side wall surface of the drill hole and the outer peripheral surface of the pile, the cement milk can be uniformly introduced over the entire circumferential direction, and the collapse of the side wall of the drill hole is prevented well. Therefore, it is possible to sufficiently secure the effective bearing capacity of the pile, and as a result, to realize excellent durability, earthquake resistance, etc. in a superstructure such as a building or a civil engineering structure. It becomes possible.

[0009] In the pile driving device according to the present invention as described above, advantageously, the guide member is provided two each in the yatco and the leader,
The two guide members on the side and the two on the leader side
It is preferable that the engaging members are slidably engaged with the guide members so that the engaging members do not come off. According to such a configuration, since the engaging member can be more securely engaged with the guide members provided on the side of the yatco and the leader without being detached, the yatco is connected via the engaging member. The coupling member can be slid with respect to the guide member even under such a coupling state. It will be possible to be guided accurately and, therefore, it will be possible to stake the stake into the wellbore in an even more correct position.

According to a preferred aspect of the pile driving device according to the present invention, the guide member provided on the leader side is supported at its lower end by a stopper member, and the guide member is engaged by the stopper member. In a state where the member is prevented from lowering, it is configured such that the yacht can be lowered along the leader. That is, even when the engaging member descends to the lower end of the leader, the stopper member having such a configuration prevents the engaging member from descending further. Can be effectively prevented. Also,
By thus preventing the engagement member from descending, the engagement member is fixed in position with respect to the leader, while the engagement state of the engagement member with the Yatco-side guide member is maintained, and the Yatco is further moved. From the place where descending is allowed, for example, in the case where the pile is to be built so that its upper surface is lower than the ground surface, even if the yacht is lowered and inserted into the excavation hole, the required pile is required. By properly setting the length of the Yatco-side guide member according to the embedding depth (burying depth) of the Yatco, the guidance of the Yatco by the guide member can be advantageously secured, and therefore, the accurate pile The embedding can be performed without being affected by the embedding depth (buried depth).

Further, according to another preferred embodiment of the pile driving device according to the present invention, the guide member provided on the side of the yatco is attached to the pile fixing cap at a lower end thereof, and the guide member is lifted when the yatco is raised. The engagement member is configured to be raised by being supported by the pile fixing cap, and thus, for example, when the yatco is lifted in order to pull out the yatco after the erection work is completed. In addition, it is possible to effectively prevent the engaging member from being detached from the lower end of the yatco-side guide member, and the stopper member having such an effective function uses the pile fixing cap. Therefore, simplification of the structure and reduction of the manufacturing cost can be advantageously achieved.

In the present invention, it is needless to say that either one of the above-described structure for preventing the engaging member from descending by the stopper member and the structure for supporting the engaging member by the pile fixing cap is employed. While possible, it is more preferred to employ both of these configurations.

In one preferred embodiment of the present invention, the hammer is hung from the upper portion of the reader, while the yacht is hung from the hammer, and the hammer approaches and abuts on the yacht. That is, the yacht is configured to be pressed or driven downward. If such a configuration is employed, the pile fitted to the pile fixing cap at the bottom thereof is pressed or penetrated into the ground in accordance with the pressing or driving of the yatco. And the effect of improving the support strength of the pile by press-fitting or penetrating such a pile can be synergistically exhibited, so that the superstructure exhibits extremely excellent durability, earthquake resistance, etc. Can be done.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, in order to further clarify the present invention, a specific configuration of a pile driving device according to the present invention will be described in detail with reference to the drawings.

First, FIG. 1 schematically shows a specific example of a pile driving device according to the present invention. Where
The pile driving device 10 includes a base machine 14 having a crane boom 12, a leader 16 whose upper part is supported at an upper end of the crane boom 12, a hammer 18 suspended from an upper portion of the leader 16, In the pile ground work by the cement milk method, a predetermined pile such as a ready-made concrete pile, a steel pile, etc., is formed in advance by excavation with an auger. It is built into a drilled hole (vertical hole) having an inner diameter larger than the pile diameter by a predetermined amount.
This is used when penetrating or press-fitting a pile. In the following description, the up-down direction means the up-down direction in FIG. 1 and FIGS. 2 and 5, which will be described later, and indicates the vertical direction with respect to the ground.

More specifically, the base machine 14 is provided with a crawler-type lower traveling body 22 and on the lower traveling body 22 so as to be capable of turning and driving in the horizontal direction (the direction indicated by A in FIG. 1). The upper slewing body 24 is provided, and the operator performs a predetermined operation in a driver's seat provided on the upper slewing body 24 to perform a desired pile erection work. You can do it. The upper revolving unit 24 includes the crane boom 12.
Are extended linearly obliquely upward, and in FIG.
, So that the crane boom 12 is driven to rotate by driving the boom cylinder 26 in the direction B, and the crane boom 12 is pivotally driven in the horizontal direction by the upper revolving body 24. The swivel drive allows the upper swivel body 24 to be swung integrally. Furthermore, the upper swing body 24 is provided with two winches (not shown), and one end of a wire 28, 30 for suspending the hammer 18 and the target stake, respectively, is attached to each winch. By being fixed to the winding drum, the wires 28 and 30 can be individually wound or fed.

The upper portion of the leader 16 is connected to the upper end of the crane boom 12. That is, as shown in FIGS.
It has a substantially rectangular cylindrical shape that extends linearly with a predetermined length, and its upper part is a crane boom 1
The leader 16 is supported by the crane boom 12 and stands upright with respect to the ground. Also,
The leader 16 is also supported at its lower end by a leader support arm 34 provided on the upper swing body 24 of the base machine 14, so that the support stability of the leader 16 is improved. In short, the leader 16 supported or supported by the crane boom 12 and the leader support arm 34 is moved integrally with the base machine 14 by the driving of the lower traveling body 22, while the horizontal direction ( The swivel drive in the direction: A) allows the upper revolving superstructure 24 and the crane boom 12 to be swiveled together, and the crane boom 12 can be raised and lowered by the swivel drive in the direction: B. In addition, when they are not driven, they can be erected very stably. In the present embodiment, the connecting portion 32 of the crane boom 12 and the leader support arm 34
In this case, the reader 16 has a structure capable of standing upright in the vertical direction, and has a structure capable of standing upright even in a state inclined with respect to the vertical direction.

Further, one of the side walls constituting the reader 16 has a stepped shape having a small width portion 38 reduced in width by the stepped portion 36.
6, a pair of stopper fittings 40, 40 as shown in FIGS.
Are fixed to the side wall of the reader 16 so as to face each other in the width direction of the small width portion 38.

Here, the stopper fitting 40 is formed of a metal plate having a substantially flat plate shape and a predetermined thickness, and has a support portion 42 having a shape corresponding to the stepped portion 36.
On the other hand, a support hole 46 is provided in the support portion 42 and extends in the center axis direction with a substantially semicircular shape corresponding to the outer peripheral shape of a leader-side guide pipe 44 as a guide member described later. The inner peripheral surface of the support hole 46 can support the outer peripheral surface of the leader-side guide pipe 44. In addition, stopper fitting 4
0, two bolt insertion holes are penetrated, and a mounting bolt 48 is inserted into these bolt insertion holes, and the tip of the mounting bolt 48 is screwed into a screw hole provided in the reader 16 to thereby form a stopper fitting. Reference numeral 40 is fixed to the reader 16 with sufficient strength. By fixing the stopper fitting 40 as described above, the axial direction of the support hole 46 in the support portion 42 is set to the vertical direction of the reader 16, and the inner peripheral surface of the support hole 46 is Are not opposed to each other, and the guide pipe 44 on the leader side can be provided. Further, two jaws 50 are formed on one side surface (the side opposite to the fixing surface for the reader 16) of the stopper fitting 40, and the stopper fitting 4 is formed.
The strength of 0 is sufficiently ensured.

In the present invention, the two guide pipes 44 on the leader side are separately supported by the pair of stopper fittings 40 and fixed to the leader 16. Specifically, each of the leader-side guide pipes 44 has a predetermined thickness and
It is constituted by a metal pipe extending linearly with a shorter length, the outer peripheral surface of the lower end of which is supported and fixed by the support hole 46 of the stopper fitting 40. , And extends in the longitudinal direction along the stepped side wall of the reader 16. In other words, each of the leader-side guide pipes 44, 44 is fixed to the reader 16 in such a manner that they are separated from each other by a predetermined distance in the direction perpendicular to the axis and extend parallel to each other in the vertical direction. In addition, in the leader side guide pipes 44, 44 arranged as described above, in addition to the support by the stopper fittings 40, 40, further, at both corners of the small width portion 38, a predetermined distance in the longitudinal direction thereof. By being intermittently welded in this manner, it is more firmly fixed to the leader 16.

On the other hand, in the present embodiment, the wire 28 whose one end is fixed by a winch is supported by the crane boom 12, extends along the longitudinal direction of the crane boom 12, and is provided above the leader 16. Hanging from the upper part of the reader 16 by being hooked on the plurality of pulleys 52 provided. A metal-made hammer 18 having a cylindrical shape and a predetermined weight is attached to the other end of the hanging wire 28, and the leader 16
The hammer 18 can be lifted and lowered along the leader 16 by the winch winding and feeding operations. Here, further, by removing the clutch provided on such a winch, the hammer 18
It can also be freely dropped along the reader 16. Further, a wire 30 for suspending a target pile is also provided in the same manner as the wire 28, and the leader 1 is also provided.
6 is suspended from the upper part of the winch, and the tip thereof (the side opposite to the fixed end with respect to the winch) is capable of fixing the pile, so that one end of the wire 30 is fixed to the winch. Actuation makes it possible to lift the pile.

Then, with the hammer 18 suspended from the upper part of the reader 16, the yacht 20 is further suspended via a wire 56. As shown in FIGS. 1 to 3 and FIG. 5, this yatco 20 is formed of a thick steel pipe having a predetermined length and thickness, and is provided at a predetermined length below the upper end surface thereof. Is supported by the two wires 56 fixed to the upper part of the hammer 18 from both sides in a direction perpendicular to the axis so that the longitudinal direction is the vertical direction. It is suspended with a sufficient distance in the direction, so that the yoke 20 can also be raised and lowered following the rise and fall of the hammer 18.

At the lower end of the yatco 20, a metal pile fixing cap 58 comprising a cylindrical pile fitting portion 60 and a disk-shaped lid portion 62 for covering the upper surface of the pile fitting portion 60 is provided.
Are coaxially fixed. Such a pile fixing cap 5
8, with the inner hole 64 of the pile fitting portion 60 opened downward,
As shown by a virtual line in FIG. 5, the upper portion of the target pile 63 can be fitted into the inner hole 64.

In this embodiment, the inner diameter of the pile fitting portion 60 (inner hole 64) in the pile fixing cap 58 is slightly larger than the outer diameter of the pile 63.
Therefore, the pile 63 is substantially immovable in the direction perpendicular to the axis, but is concentrically fitted into the pile fixing cap 58 in a state where the movement in the axial direction is allowed. On the other hand, the outer diameter of the pile fixing cap 58 (the pile fitting portion 60 and the lid 62) is larger than the thickness of the yatco 20 and the inner diameter of the excavation hole that is larger than the pile diameter by a predetermined amount (ie, , Auger diameter), so that the pile fixing cap 58 and the Yatco 20 can be inserted into the excavation hole, and the center of the excavation hole and the pile fixing cap 58 (Yatco 20). Matching,
It can be done easily and accurately. In short, in the pile fixing cap 58 of the present embodiment, since the specific inner diameter and the outer diameter are both included, the yatco 20 is replaced with the lower pile fixing cap 58. When the pile 63 is inserted into the excavation hole in a state in which the pile 63 is fitted, the pile insertion portion 60 is sandwiched between the side wall surface of the excavation hole and the outer peripheral surface of the pile 63 over the entire circumferential direction. As a result, the pile 63 is inserted concentrically into the excavation hole.

Further, in the inner hole 64 of the pile fitting portion 60, a cushioning material 66 made of wood or the like is overlapped on the lower surface of the lid portion 62 and fitted and fixed. In the penetrating operation of the pile 63, the impact on the pile 63 is moderately moderated, and the breakage of the pile 63 can be effectively prevented. In addition, in order to facilitate the work of fitting the stake 63 into the inner hole 64, the lower end portion 68 of the stake insertion portion 60 expands outward in the direction perpendicular to the axis as it goes downward. It is said that.

Further, in the pile driving device 10, two Yatco-side guide pipes 70, 70 as guide members are attached to the Yatco 20 having such a configuration. In other words, the guide pipe 70
Is made of a metal pipe extending linearly with the same thickness as the leader-side guide pipe 44, and is shorter than the length of the Yatco 20 by a predetermined length. In addition, the Yatco-side guide pipes 70, 70
At each lower end, the lid 6 of the pile fixing cap 58
2 are fixed at predetermined positions on the upper surface of the upper surface 2, here, at two positions deviated from the center by a predetermined distance in the direction perpendicular to the axis, and are separated from each other at a predetermined distance in the direction perpendicular to the axis (here, the two The guide pipes 44 and 44 are set to have the same distance from each other), and extend in parallel with each other along the outer surface in the longitudinal direction of the yatco 20. In other words, since the yatco 20 is suspended so that the longitudinal direction is the vertical direction, the yatco-side guide pipes 70 are fixed to the yatco 20 so as to extend in the vertical direction. -ing In addition, in such a Yatco-side guide pipe 70, 70, the outer surface of the Yatco 20
It is intermittently welded and fixed at a predetermined distance in the longitudinal direction, and its fixing strength is increased.

In the pile driving device 10 according to the present invention, an engagement fitting 72 as an engagement member is provided between the leader 16 and the yatco 20 as described above. As shown in FIGS. 2 and 3, the engagement metal fitting 72 includes a metal body 74 having a thick, substantially flat plate shape, and an engagement portion 76 (a) provided integrally therewith.
On the other hand, the metal fitting body 74 is formed to have a predetermined size.

Further, the engaging portions 76a to 76d are
It has the same height as the above, and is formed in a semicircular shape with a predetermined thickness from a corner extending in the height direction on a side surface facing the width direction of the metal fitting body 74. Further, in the engaging portions 76a to 76d, the inner peripheral surface thereof has a curved inner surface 78 extending in the height direction with a semicircular shape corresponding to the outer peripheral shape of the leader-side and Yatco-side guide pipes 44, 70. And the spacing between the engaging portions 76a and 76b corresponds to the distance between the two leader-side guide pipes 44, 44, and the spacing between the engaging portions 76c and 76d is The guide pipes 70, 70 are set so as to correspond to the mutual separation distance between the two guide pipes 70, 70. The guide pipes 70, 70 can be slidably and irremovably engaged with the guide pipes 70, 70. In addition, in the engaging metal fitting 72, two flat plate-like convex plates 8 are provided on both side surfaces of the metal fitting body 74 facing each other in the width direction so as to straddle the engaging portion 76, respectively.
0,80 are fixed, and the strength is excellent.

The shape of the curved inner surface 78 of the engaging portion 76 may be selected from the following:
It is sufficient if it has a structure corresponding to the outer peripheral shape of 4, 70 and slidably engageable so that the engaging metal member 72 does not come off. However, here, since it is a semicircular shape as described above, Accordingly, it is possible to advantageously prevent the movement of the engagement fitting 72 from becoming difficult due to dirt caused by mud or cement milk generated in the pile 63 erection work, and to remove or wash the dirt. The work can be easily performed.

Thus, in the pile driving device 10 according to the present invention, both surfaces of the fitting body 74 of the fitting body 72 are
Between the disposition of the leader 16 and the Yatco 20, they are opposed to the Leader 16 and the Yatco 20 at a predetermined distance, and each engaging portion 76 has a curved inner surface 78 at the leader side and the Yatco side guide pipe. The engaging metal fittings 7 are engaged with the fittings 44 and 70 in a non-removable manner and slidably along each guide pipe in the vertical direction.
2 is provided. In other words, Yatco 2
Numeral 0 is connected to the reader 16 so as to be movable in the vertical direction (vertical direction) with respect to the reader 16 by the engagement fitting 72 so as not to be displaced in the horizontal direction. It can be guided to. In short, the pile driving device 10 according to the present invention has a feature that the yatco 20 can be raised and lowered accurately along the leader 16 without causing any rocking thereof. is there.

In this embodiment, the reader 16
Two guide pipes 44 and 70 are provided for each of the Yatco 20 and the engagement pipe 72, and the engagement fittings 72 are non-removably and slidably engaged with them. Since the yatco 20 can be guided under the condition that it is very well connected to the reader 16, the yatco 20 can be moved up and down very accurately.

Further, in the pile driving device 10 as described above, when the yatco 20 is lifted, it is moved along the yatco-side guide pipe 70 by its own weight.
Of the pile fixing cap 58 (lid portion 62) having an outer diameter larger than the thickness of the yatco 20 and fixed to the lower end of the yatco 20.
Thus, the engagement fitting 72 can be advantageously prevented from being detached from the lower end of the yatco-side guide pipe 70.

Further, in the pile driving device 10, the outer peripheral surface of the leader-side guide pipe 44 is
Is supported on the inner peripheral surface of the support hole 46 of the support portion 42 of the stopper fitting 40 provided at the lower end of the stopper 16 so that the engaging fitting 72 is mounted on the leader 16 as described above, for example. In a case where the yatco 20 is lowered from the state in which it is abutted and supported by the fixing cap 58 to a position where the upper surface of the pile fixing cap 58 is lower than the upper surface of the stopper fitting 40 (the supporting portion 42), the leader is owed to its own weight. Engagement fitting 72 lowered to the lower end of 16
Is that the lower surface thereof abuts against the upper surface of the support portion 42 of the stopper fitting 40, thereby preventing further lowering. That is, the leader-side guide pipe 44 of the engaging fitting 72
Is effectively prevented. In addition, even in a case where the yatco 20 is further lowered to be inserted into the excavation hole, the lowering of the engagement metal member 72 is prevented by the stopper metal member 40, and the position of the engagement metal member 72 is fixed with respect to the leader 16; The engagement metal member 72 is maintained in a slidable engagement state with respect to the Yatco-side guide pipe 70, so that the further downward movement of the Yatco 20 is allowed. Is set appropriately, there is an advantage that the guidance of the yatco 20 can be advantageously secured.

In the present embodiment, in addition to the above-described configuration, a yatco fixing cap 82 is fitted on the upper end of the yatco 20 suspended from the hammer 18. The Yatco fixing cap 82 has a cylindrical shape with a bottom having an inner hole 84 slightly larger than the outer diameter of the Yatco 20.
In the inner hole 84, the upper part of the yatco 20 is supported and fixed substantially immovably in the direction perpendicular to the axis and movably in the axial direction. It is possible to do. A disk-shaped hammer receiving portion 86 formed of a rubber elastic body and a rope is provided coaxially on the upper surface of the upper bottom portion, while a bottom surface of the inner hole 84 is provided with a tree or the like. The formed cushioning material 88 is fitted, and the pile 63
In the penetrating operation, the impact of the hammer 18 on the Yatko fixing cap 82 and the Yatco 20 can be absorbed to such an extent that the penetration of the pile 63 is not hindered, so that the hammering noise, the destruction of the Yatco 20, etc. can be advantageously prevented. ing.

Further, the cap 82 is
A cap guide portion 90 having a curved inner surface similar to that of the engaging portion 76 of the engaging metal fitting 72 and protruding in a direction perpendicular to the axis.
Are provided integrally with each other so as to face each other.
6, two leader-side guide pipes 44, 44
Is fixed to the cap 8
2 can be slid up and down. Therefore, as shown in FIGS. 1 and 2, between the hammer 18 and the yatco 20, such a yatco fixing cap 82 is put on the upper portion of the suspended yatco 20 in its inner hole 84. The Yatco fixing cap 82 moves up and down the Yatco 20,
While being guided by the leader side guide pipes 44, 44, it moves up and down in the vertical direction. On the other hand, the yatco 20 is also supported by the yatco fixing cap 82 so as not to swing even in its upper part. You are getting it. Note that the axial height of the Yatco fixing cap 82 (including the hammer receiving portion 86) is sufficiently smaller than the distance between the hammer 18 and the Yatco 20.

Further, the above-mentioned hammer 18 also has the same curved inner surface as the engaging portion 76 of the engaging metal fitting 72, which can be engaged with the two guide pipes 44 on the leader side. Hammer guides 92, 92
Are fixed to face each other. By engaging the curved inner surfaces provided in the hammer guides 92 with the leader-side guide pipes 44, the hammer 18 can also be accurately moved along the leader without swinging. The hammer 18 can be raised and lowered. Further, here, the hammer 18 is configured so that the hammer 18 can be centered and abutted against the Yatko fixing cap 82 (hammer receiving portion 86). In the work of penetrating or press-fitting the pile 63, the load by the hammer 18 can be uniformly applied to the Yatco fixing cap 82, and eventually the Yatco 20, and further to the upper surface of the pile 63.

By the way, the pile driving device 1 having such a configuration
0 is used when a target pile 63 is erected in a predetermined vertical hole into which cement milk, which is a consolidation liquid, is injected in a pile ground business by the cement milk method as described above. The predetermined vertical hole is formed by excavation with an auger at a predetermined position on the ground in advance before the pile 63 is built, and the outer diameter of the pile 63 to be built corresponding to the auger diameter. The inner diameter is larger than the inner diameter by a predetermined amount. In addition, as an auger used in the excavation work of this vertical hole (drilling hole), a vertical hole is excavated in the ground by a rotating action of an auger screw having a spiral blade around a rotation axis. Known ones may be employed, and advantageously, during excavation, a stable liquid such as bentonite solution may be injected from the tip of the auger screw, and when the auger screw is withdrawn, cement milk may be injected from the tip. Using the configured auger, at the same time as the excavation work, the addition of the fall prevention of the excavation hole and the injection of cement milk are carried out,
preferable.

The target pile 63 is erected in the excavation hole by using the piling device 10 in the following manner, for example.

First, after a predetermined pile 63 is fixed to the wire 30, it is lifted, and furthermore, the pile 63 is inserted into the excavation hole by driving the base machine 14, so that the portion fixed by the wire 30 is a predetermined distance from the ground surface. Lower it to a position above the height.

Next, the base machine 14 is driven,
The yatco 20 (pile fixing cap 58) is positioned above the pile 63 inserted into the excavation hole. Here, in parallel with the driving of the base machine 14, the length of the wire 30 is adjusted by the winch, whereby
The height of the stake 63 is maintained substantially constant.

Thereafter, the hammer 18 and the yatco 20 are lowered, and the upper portion of the pile 63 is fitted into the pile fixing cap 58 of the yatco 20. Then, the upper revolving unit 24 of the base machine 14 is slightly swiveled to drive. The pile 63 is temporarily fixed by contacting the outer peripheral surface thereof with the side wall of the excavation hole. Also, the yatco 20 on the temporarily fixed pile 63
The hammer 18 is lowered from the place where it is supported by the pile 63 and cannot be moved in the vertical direction, so that the wire 56 hanging the yatco 20 is loosened.

Further, after removing the wire 30 for fixing the pile 63, the upper revolving unit 24 is driven to rotate to release the contact of the pile 63 with the side wall of the excavation hole,
0, the leader 16 is erected so that the pile fixing cap 58 and the pile 63 are coaxially positioned with respect to the drilled hole.
Accordingly, the pile 63 is fixed to the pile fixing cap 58 so as not to be movable in the direction perpendicular to the axis, and falls freely together with the yatco 20 until its lower surface reaches the bottom surface in the excavation hole. Therefore, the pile 63
Will be built in the excavation hole. Note that, here, by disengaging the clutch of the winch to which the wire 28 hanging the hammer 18 is fixed, the hammer 18 is also allowed to freely fall together with the pile 63 and the yatco 20, so that a certain amount of A load may be applied to the pile 63.

After the pile 63 is built, it is preferable to further penetrate or press the pile 63 into the ground. More specifically, the hammer 18 is raised to such an extent that the After extending the wire 56 that fixes the hammer 20, the clutch of the winch to which the wire 28 that suspends the hammer 18 is fixed is disengaged, so that the hammer 18 is allowed to fall freely, and the hammer receiving portion of the cap 82 is fixed. 86 (Yatco 2
0), the hammer 18 is driven into the ground by performing the operation of driving the yatco 20 a predetermined number of times, or the hammer 18 is sent out by the operation of sending out a winch for fixing the wire 28. By approaching and lowering the yatco 20, the hammer receiving portion 86 of the yatco fixing cap 82 is brought into contact with the hammer receiving portion 86, and is placed thereon, so that the yatco 20 is pressed downward.
It is desirable to press the pile 63 into the ground.

Further, in the present embodiment, the
0 and the pile fixing cap 58 can be inserted into the excavation hole. Then, using the pile 63 set to be shorter than the depth of the excavation hole, the yatco 20 is allowed to freely fall together with the pile 63, and In such a state, by driving or pressing the yatco 20 in this state, the pile 63 is built up so that the upper surface thereof is lower than the ground surface, and a penetration or press-fitting operation under such a state is performed. Can be implemented. In this case, the required depth of embedding or embedding of the pile 63, in particular, here, the distance from the position where the pile 63 is temporarily fixed to the bottom of the excavation hole is taken into consideration. It is preferable to set the length and the like of the yatco-side guide pipe 70.

Then, it is built in the excavation hole,
In addition, a pile 6 that has been subjected to a penetration operation or a press-in operation as necessary.
No. 3 is to be buried in the ground by solidifying the cement milk.

Therefore, according to the pile driving apparatus 10 according to the present invention, since the pile driving apparatus 10 can be moved up and down along the leader 16 with high accuracy, the pile driving apparatus 10 can be used. The pile 63 fitted into the lower pile fixing cap 58 falls freely together with the yatco 20 and does not tilt or deviate at all from the center axis of the borehole having an inner diameter larger than the pile diameter. At a predetermined position in the drilling hole, it is inserted very accurately and built, and therefore, between the side wall surface of the drilling hole and the outer peripheral surface of the pile 63, over the entire circumferential direction, Cement milk can be introduced evenly,
In addition, collapse of the side wall of the excavation hole can be prevented well, so that a high effective pile supporting force can be obtained, and as a result, in the superstructure such as a building or a civil engineering structure, Thus, excellent durability and earthquake resistance can be exhibited.

Further, since the pile 63 can be pierced or pressed into the ground by driving or pressing the yacht 20 by the hammer 18, the above-described effective effects and the penetration or press-fitting of the pile 63 can be obtained. In combination with the effect of the improvement in the bearing capacity of the piles, the superior structure can achieve extremely excellent durability, earthquake resistance, and the like.

Furthermore, when the pile 63 is built so that the upper surface of the pile 63 is lower than the ground surface, or when the pile 63 is penetrated or pressed in such a state, the pile 6
In the case where the yatco 20 is lowered and inserted into the excavation hole together with the yoke 3, the pile driving device 10 requires the yawco-side guide according to the required depth of the pile 63 to be laid or buried. If the length and the like of the pipe 70 are appropriately set, the lowering action of the engagement fitting 72 by the stopper fitting 40 is effectively exerted, so that the guide of the yatco 20 can be advantageously secured. Therefore, accurate embedding, penetration or press-fitting can be realized without being affected by the embedding depth (burial depth) of the pile 63. Moreover, in the pile driving device 10 of the present embodiment, since the inner diameter and the outer diameter of the pile fixing cap 58 are configured as described above, in particular, as described above, the yatco 20 is lowered and excavated. In the case where the pile 63 is inserted into the hole, the pile 63 is concentrically inserted into the drill hole with high accuracy. Therefore, between the side wall surface of the drill hole and the outer peripheral surface of the pile 63,
The cement milk can be introduced more evenly, and therefore the pile bearing capacity can be obtained more effectively.

Although the typical embodiments of the present invention have been described in detail above, they are merely examples, and the present invention is not limited to any specific description according to such embodiments. Needless to say, it is not to be construed as limiting.

For example, as a pile driving device to which the present invention is applied, a suspended yatco is lowered along a leader so that an upper portion is fitted into a pile fixing cap fixed to a lower portion of the yatco. Anything can be used as long as the pile can be built in the auger drill hole.
The specific configuration is by no means limited to those of the illustrated embodiment.

As the reader, in addition to the rectangular tubular shape as in the illustrated embodiment, a rectangular column shape, a cylindrical shape,
Any of various shapes conventionally used, such as a columnar shape, can be adopted, and the size, material, and the like are appropriately set as needed.

Further, the yatco can be constructed in various forms according to the type of piles to be built and the like, and those widely used conventionally in the pile construction work can be advantageously used. Also, the structure of the pile fixing cap fixed to the lower part may be any type as long as it can fit the upper part of the pile, and may be appropriately set according to the type of the pile.

Further, the specific configuration of the guide members provided on the yatco and the leader, such as the shape, size, material, and number of arrangements, can be appropriately set as required. In order to reduce the number of parts and reduce the manufacturing cost, for example, the guide member on the side of the yatco may be provided integrally with the yatco, or may be constituted by the yatco itself.

In addition, in the illustrated embodiment, the engaging member fitted to such a guide member has a curved inner surface extending in one direction with a semicircular shape.
The one that engages with the guide member at such a curved inner surface is employed, but is not limited to this, and various forms according to the specific configuration of the guide member and the like are employed. Furthermore, for example, there is no problem even if it has a through-hole through which the guide member can be inserted, and is configured to be fitted to the guide member through the through-hole.

The device of the present invention excavates not only the above-mentioned ready-made concrete piles and steel piles but also various known piles such as composite piles such as those in which steel piles are fixed to the top of concrete piles. The piles are advantageously used when erected in a hole, and the piles may be either support piles or friction piles.

In addition, although not enumerated one by one, the present invention
Based on the knowledge of those skilled in the art, the present invention can be implemented in a form in which various changes, modifications, improvements, and the like are made.
As long as such an embodiment does not depart from the gist of the present invention, it is supposed that any of the embodiments belongs to the scope of the present invention.
Needless to say.

[0057]

As is apparent from the above description, in the pile driving device according to the present invention, the yatco is movable with respect to the leader in the vertical direction, but is not displaced in the horizontal direction. In the connected state, it is guided in the vertical direction by the guidance of the guide member, so that it can be raised and lowered accurately along the leader without swinging the yacht Is what you do.

Therefore, when such a pile driving device according to the present invention is used when, for example, a pile is built in an excavation hole by an auger in a pile ground construction work by a cement milk method, an upper portion of a pile fixing cap at a lower part of a yatco is provided. Without any inclination or deviation from the center axis of the borehole with an inner diameter larger than the diameter of the pile.
It can be accurately built at a predetermined position in the excavation hole.

[Brief description of the drawings]

FIG. 1 is a side view schematically showing a pile driving device as one embodiment of the present invention.

FIG. 2 is an explanatory view showing an enlarged main part of the pile driving device shown in FIG. 1, and corresponds to the front view of FIG. 1;

FIG. 3 is a sectional view taken along the line III-III in FIG. 2;

FIG. 4 is an enlarged partial explanatory view showing a lower end portion of a leader provided in the pile driving device shown in FIG. 1;
Is a side view, and (b) is a bottom view.

FIG. 5 is a sectional view taken along line VV in FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Piling device 16 Leader 18 Hammer 20 Yatco 40 Stopper fitting 44 Leader side guide pipe 58 Pile fixing cap 70 Yatco side guide pipe 72 Engagement fitting

Claims (5)

[Claims] 1. A pile driving method in which a suspended yatco is lowered along a leader so that a pile having an upper part fitted into a pile fixing cap fixed to a lower part of the yatco is built into a drilling hole by an auger. In the apparatus, a guide member is provided on both the yacht and the reader so as to extend in the up-down direction, and an engagement member that is fitted to each of the two guide members and is movable in the up-down direction is provided. A pile driving device characterized in that the pile driving device is guided vertically by a guide by the guide member while being connected to the leader by an engaging member. 2. The two guide members are provided for each of the yatco and the leader, while the two guide members on the yatco side and the two guide members on the leader side are respectively provided with: The pile driving device according to claim 1, wherein the engaging member is slidably engaged so as not to be detached. 3. A guide member provided on the leader side is supported at its lower end by a stopper member, and when the stopper member prevents the lowering of the engaging member, the guide member is connected to the leader member. 3. The pile driving device according to claim 1, wherein the pile driving device is configured to be able to be lowered along the axis. 4. A guide member provided on the yatco side is attached to the pile fixing cap at a lower end thereof, so that when the yatco is raised, the engaging member is supported by the pile fixing cap and raised. The pile driving device according to any one of claims 1 to 3. 5. A hammer is hung from the top of the leader, while the yacht is hung from the hammer, and the approach of the hammer to the yacht pushes the yacht downward. 5. The pile driving device according to claim 1, wherein the pile driving device is driven.