JP2000257063A - Pile driving method and device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a piling method capable of certainly and easily driving a pile by avoiding collapse of a drilling wall and improving its working performance. SOLUTION: A drilling machine 12 is equipped in the inside of a casing 9, a casing 9 devised to be capable of inserting a pile in the inside of the casing 9 in parallel with the drilling machine 12 is used, and the pile 13 is inserted and held in the inside of this casing 9. Thereafter, holding of the pile 13 in the inside of the casing 9 is released after intruding the casing 9 to specified depth under the ground while driving the drilling machine 12 in this state, and the casing 9 is pulled up by leaving this pile 13 underground.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pile driving method and a pile driving method for driving a ready-made pile into the ground during foundation work.

[0002]

2. Description of the Related Art In a conventional pile driving method, a ground is excavated with, for example, an earth auger, or an air hammer is provided in a casing, and the air hammer is driven while rotating the casing to excavate the ground. After drilling and lifting the earth auger or casing, the pile is erected in the borehole with a crane or the like.

[0003]

In the conventional method as described above, the excavation of the ground and the driving of the piles are separate processes, so that the work efficiency is poor, and in the case of the ground soil mixed with cobblestones, When the earth auger or casing is lifted, the hole wall collapses, and the excavation hole is buried in a state like an ant hell, which makes it difficult to insert a pile.

[0004] In view of the above, the present invention is intended to avoid the collapse of the hole wall by driving the pile simultaneously with the excavation of the ground, to facilitate the driving of the pile, and to improve the work efficiency. An object of the present invention is to provide a pile driving method and a pile driving device that can be achieved.

[0005]

According to the pile driving method of the present invention, a drilling machine 12 is provided inside the casing 9A, and a pile 13 can be inserted into the casing 9A in parallel with the drilling machine 12. The pile 9 is inserted into and held in the casing 9A, and the casing 9A is penetrated to a predetermined depth in the ground while driving the drilling machine 12 in this state.
The holding of the pile inside A is released, and the casing 9A is pulled up while leaving the pile 13 in the ground.

In the pile driving method according to the second aspect of the present invention, the drilling machine 12 is provided inside the casing 9 and the casing 9 is divided vertically so that the pile can be inserted in the casing 9 in parallel with the drilling machine 12. A casing 9 which is divided and opened and closed is used.
After inserting and holding the casing 9 and driving the drilling machine 12 in this state and penetrating the casing 9 to a predetermined depth in the ground,
The holding of the pile 13 inside the casing 9 is released, and the pile 1
3 is characterized in that the casing 9 is pulled up while leaving it in the ground.

According to a third aspect of the present invention, in the pile driving apparatus, the casing 9 is vertically connected by the suspending means 3 so as to be able to move up and down. The casing 9A is provided with the drilling machine 12 inside the casing 9A and the casing 9A. And a pile holding means 52 to 54 for holding the pile 13 inserted inside the casing 9A while being capable of inserting the pile 13 in parallel with the drilling machine 12. is there.

According to the fourth aspect of the present invention, a casing 9 is vertically connected to a lower portion of an elevator frame 4 which can move up and down along the leader 1.
The casing 9 is equipped with a drilling machine 12 inside, and the casing 9 is divided vertically so that the pile can be opened and closed so that the pile can be inserted in parallel with the drilling machine 12 inside the casing 9. It is characterized by comprising a hanging insertion means 33 for hanging and inserting the inside and a pile holding means 34 for holding the pile 13 inserted inside the casing 9.

[0009]

FIG. 1 is a side view showing a pile driving device according to the present invention. In this figure, reference numeral 1 denotes a leader, which is held in a vertical posture by a back stay 3 extended from the traveling vehicle 2. Reference numeral 4 denotes an elevator frame which is supported so as to be able to move up and down along the reader 1 and is suspended by a winch elevating operation wire 5. The elevator frame 4 is provided with a rotary driving device 6. An output shaft 7 (see FIG. 2) of the rotary driving device 6 is connected to a casing 9 via a rotary shaft 8.
Are linked together.

FIG. 2 is a longitudinal sectional view showing the upper end of the casing 9, FIG. 3 is a longitudinal sectional view showing the lower end of the casing 9,
4 is a sectional view taken along line VV of FIG. 2, FIG. 5 is a sectional view taken along line WW of FIG. 2, and FIG. 6 is a sectional view taken along line XX of FIG. As shown in FIG. 2, the upper end 8 a of the rotating shaft 8 is pin-coupled to the output shaft 7 of the rotary drive device 6, and the lower end 8 b of the rotating shaft 8 projects integrally on the upper fixed plate 10 of the casing 9. The coupling 9 is connected to the output shaft 7 of the rotary driving device 6 by a pin. Casing 9
Is equipped with a down-the-hole hammer 12 as a drilling machine for pre-drilling, and is vertically divided so that a pile 13 can be inserted in the casing 9 in parallel with the down-the-hole hammer 12 so as to be opened and closed. It is configured to be possible.

[0011] The structure of the casing 9 will be described in detail.
As shown in FIG.
And a pair of open / close side plates 15, 15, each of which is formed in an arc shape in cross section, and has one side edge hinged to both side edges of the vertically long strip-shaped substrate 14 by hinges 17. Inside each opening / closing side plate 15, a down-the-hole hammer 12, an air supply pipe 16 for supplying air thereto, and a casing 9
And a grout supply pipe 19 for injecting grout such as cement milk for consolidation from the lower end of the drilling hole into the borehole. Locking means 18 for locking the open / close side plates 15, 15 to the closed position is provided at the other side edge (the free end side edge) of the open / close side plates 15, 15, respectively.

FIGS. 2 and 3 show a state in which both the open / close side plates 15, 15 of the casing 9 are closed.
FIG. 7 and FIG. 8 show a state where 5 is opened. Both open / close side plates 1
Hinge 1 hinges 5, 15 to both side edges of substrate 14
Reference numerals 7 are provided at required intervals in the longitudinal direction of the casing 9. 9 to 12, the state in which both open / close side plates 15, 15 are closed is indicated by a solid line, and the state in which both open / close side plates 15, 15 are open is indicated by a virtual line. As schematically shown in FIG. 10, a locking means 18 for locking the two open / close side plates 15 and 15 in the closed position includes a male engaging portion 18a provided at the free end side edge of one open / close side plate 15 and a male engaging portion 18a. Opposite open / close side plate 1
5, the female engaging portion 18b provided on the free end side edge portion, and the open / close side plates 15, 15 are closed to close the male and female engaging portions 18a, 18b.
And a lock pin 18c penetrating vertically through the male and female engaging portions 18a and 18b at positions where they are engaged with each other. Opening / closing operation of both open / close side plates 15, 15 and lock pin 1
The lock operation and the lock release operation by 8c are manually performed, respectively.

As shown in FIGS. 4 to 6 and FIGS. 9 to 12, semi-circular mounting plates 20, 20 are fixed to the upper ends of the open / close side plates 15, 15, respectively. 20,2
A disk-shaped upper fixing plate 10 is placed on the upper surface of the upper fixing plate 10, and one end of each of the mounting plates 20
Are pivotally connected to the shafts 21 and 21. Double Axis 2
Numerals 1 and 21 are arranged coaxially with hinges 17 and 17 that hinge both open / close side plates 15 and 15 to both side edges of the substrate 14. The free ends of both mounting plates 20, 20 are shown in FIG.
As can be seen from FIG. 10 and FIG. 10, the open / close side plates 15 of the casing 9 are locked to the upper fixed plate 10 via the lock pins 22 in the closed position.
Each lock pin 22 is inserted from the upper fixing plate 10 into the lock hole a of the mounting plate 20.

As shown in FIG. 2, air is supplied to an air supply pipe 16 provided on each of the open / close side plates 15 of the casing 9 by an air swivel mechanism 2 provided on the outer periphery of the rotary shaft 8.
3 is performed. That is, the air swivel mechanism 23
Has a cylindrical body 24 that is fitted to the rotary shaft 8 via a bearing and an oil seal so that only relative rotation is possible. An annular passage 25 is formed in the inner peripheral surface of the cylindrical body 24. An air introduction pipe 26 for introducing air into the annular passage 25 is attached to the tubular body 24, and the air introduction pipe 26 is suspended and held by a wire 27 suspended from the elevator frame 4 so as not to rotate. . The annular passage 25 communicates with the upper end of an air supply passage 28 provided inside the rotary shaft 8, and the lower end of the air supply passage 28 is connected via a hose 29 to the air supply passage on each of the open / close side plates 15. Connected to tube 16.
The air introduction pipe 26 is connected to an air compressor via an air hose.

The grout is supplied to a grout supply pipe 19 provided on each of the open / close side plates 15 of the casing 9 by a grout introduction hose 30 as schematically shown in FIG. The output is carried out through the grout swivel mechanism through the output shaft 7 of the rotary drive device 6), the grout supply path inside the output shaft 7, the grout supply path 31 inside the rotary shaft body 8, and the hose 32 (FIG. 2). reference). The grout introduction hose 30 is connected to a grout pressure feed pump.

Although the down-the-hole hammer 12 is a well-known one, its detailed illustration is omitted. A cylinder is provided inside the hammer body 12a, and a hammer piston sliding in the cylinder supplies compressed air. The hammer piston reciprocates, and the reciprocating hammer piston projects from the lower part of the hammer body 12a.
b, and the striking action crushes the ground, especially the rock. Since the down-the-hole hammer 12 is integrally provided on each of the open / close side plates 15 forming the casing 9, the down-the-hole hammer 12 turns with the rotation of the casing 9 driven by the rotation drive device 6.

FIGS. 13A to 13C show hanging insertion means 3 for hanging and inserting the pile 13 inside the casing 9.
3 and a pile holding means 34 for holding the pile 13 inserted inside the casing 9. Here, the pile 13 is made of an H-shaped steel, and a flange portion of the H-shaped steel is denoted by 13a, and a web portion is denoted by 13b.

First, the hanging insertion means 33 includes a hanging wire 35 hanging down from the top of the reader 1 (see FIG. 1),
Sheaves 36 and 37 for guiding the suspending wire 35 into the opened casing 9;
And a hook 39 which is engaged with an engagement hole 38 provided at the upper end of the web portion 13b of the pile 13 made of H-section steel. As shown in FIG. 13A, the sheave 36 is pivotally mounted on the casing open side end of the upper fixing plate 10, and the sheave 37 is located inside the casing 9 and at the center of the lower surface of the upper fixing plate 10. It is mounted on a mounting frame 40 which is connected in a hanging manner. The sheave 37 is supported by a support shaft 41 which is mounted in a cantilever manner on a mounting plate 40 a provided on the upper side of the mounting frame 40. Note that the suspension wire 35 is operated on the traveling carriage 2 side.

The pile holding means 34 is formed at the lower end of the mounting frame 40 as shown in FIGS. 13A and 13C, and is formed at the upper end of the web 13b of the pile 13 made of H-section steel. , A pin insertion hole 43 penetrating the engagement groove 42 in the lateral direction, and a web portion 13 of the pile 13 from the pin insertion hole 43 of the engagement groove 42.
(b) a lock pin 45 inserted through the pin insertion hole 44 provided at the upper end.

FIG. 14 shows a pile pushing-down means 46, which lifts the pile 13 by releasing the holding of the pile 13 by the pile holding means 34 and pulling the pile 13 down when the casing 9 is pulled up. Is to be prevented. As shown in FIG. 13 (B), this pile pushing-down means 46
The piston rod 46a is extended in a state where the holding of the pile 13 by the pile holding means 34 is released,
A downward pressing force is applied to the pile 13 via the pressing member 46b at the tip.

A pile driving method using the pile driving device having the above-described configuration will be described below with reference to other drawings, mainly with reference to the process diagrams shown in FIGS.

First, as shown in FIG. 15, with the casing 9 suspended above the ground, the open / close side plates 15, 1
5 is opened, and the stake 13 is inserted between the open / closed side plates 15 and 15. At this time, the worker climbs up the reader 1 and removes the lock pins 22 (see FIG. 10) engaged with the respective mounting plates 20 from the upper fixing plate 10 of the casing 9, and
Further, the locking means 18 for locking the open / close side plates 15 and 15 in the closed position is unlocked, and the open / close side plates 15 and 15 are opened.

After the open / close side plates 15, 15 of the casing 9 are opened, the pile 13 is suspended and inserted into the casing 9 by the suspending and inserting means 33, and the inserted pile 13 is secured to the casing 9 by the pile holding means 34. Keep inside. At this time, the hanging wire 35 of the hanging insertion means 33 is hung on the sheaves 35 and 36 and lowered near the ground, and the hook 39 at the tip is hooked into the engagement hole 38 of the pile 13 laid on the ground. While winding the wire 35, the pile 13 is hung inside the opened casing 9, and the web portion 13 b of the pile 13 is inserted into the engagement groove 42 of the pile holding means 34 as shown in FIG. Of the pile 13 from the pin insertion hole 43 of the engagement groove 42.
And the pile 13 is held in a state of being suspended inside the casing 9 as shown in FIG.

As described above, the pile 13 is suspended and inserted into the casing 9 by the suspending and inserting means 33, and is held by the pile holding means 34.
9 is removed from the pile 13, and the suspension wire 35 is further removed from the sheaves 35 and 36. At this time, the sheave 36 inside the casing 9 is attached to the mounting plate portion 40 as shown in FIG.
Since the support wire 41 is supported by the support shaft 41 mounted in a cantilever state, the removal of the hanging wire 35 is facilitated easily. Thereafter, the open / close side plates 15, 15 of the casing 9 are closed, the free end side edges are locked by the lock means 18, and the lock pins 22 are respectively inserted from the upper fixed plate 10 into the two mounting plates 20, 20, respectively. After being put on and fixed, the state shown in FIG. 15 is obtained.

Next, the casing 9 itself is rotated by the rotary drive unit 6 while the casing 9 is grounded and the down-the-hole hammer 12, 12 provided inside the casing 9 is driven to dig the ground in advance. While turning both hammers 12, 12, the casing 9 penetrates into the ground as shown in FIG. At this time, excavated earth and sand, crushed debris and the like excavated by each down-the-hole hammer 12 are discharged to the ground from a gap between the casing 9 and the excavation hole by compressed air jetted from the tip of the bit 12b. Down the hole hammer 12 as above
By rotating the casing 9 during the driving of, the crushing and piercing of the ground by the hammer 12 can be more effectively exerted.

When the casing 9 has penetrated to a predetermined depth in the ground as shown in FIG. 15, the driving of each down-the-hole hammer 12 is stopped, and then the grout pressure pump on the ground is started, and the grout introduction hose 30 is turned off. The casing 9 passes through the grout supply path inside the rotation drive device 6, the grout supply path 31 inside the rotary shaft 8 and the hose 32.
The grout such as cement milk is supplied to the grout supply pipes 19 provided on the respective opening / closing side plates 15, and the grout is injected into the excavation hole from the end of each grout supply pipe 19.

As described above, while the grout is being injected into the excavation hole, the elevator frame 4 is lifted by the winding operation of the lifting operation wire 5, and the casing 9 is pulled up. In raising the casing 9, the holding of the pile 13 by the pile holding means 34 inside the casing 9 is released, and the pile 1
The casing 9 is pulled up while leaving 3 in the ground. To release the holding of the stake 13 by the stake holding means 34, the worker may pull out the lock pin 45 on the ground. Further, at this time, the pile 13 may rise together with the raising of the casing 9, so that the pile pushing-down means 46 is operated, and the pile 13 is pushed down and separated as shown by the phantom line in FIG. 13 to prevent the rise
It can be reliably left in the ground.

FIG. 15 shows a state in which the casing 9 is pulled up while the pile 13 is left in the ground.
This shows a state in which the casing 9 is completely pulled up to the ground. The pile 13 left in the excavation hole of the ground is solidified by the grout injected into the excavation hole to form a strong support pile. While the casing 9 is being lifted, the casing 9
May be rotated by the rotation driving device 6.

According to the pile driving method described above, the down-the-hole hammer 1 as a drilling machine is provided inside the casing 9.
2 is used, and the casing 9 is divided vertically so that the pile 13 can be inserted into the casing 9 in parallel with the down-the-hole hammer 12 so that the pile 9 can be opened and closed. In a state where the pile 13 is suspended and inserted into the casing 9 by the hanging insertion means 33 in a state where the pile 9 is held by the pile holding means 34, the casing 9 is digged in advance by the down-the-hole hammer 12, and After penetrating to the depth, the holding of the pile 13 in the casing 9 is released, and the pile 13 is left in the ground so that the casing is pulled up. Therefore, when the casing 9 is pulled up, the hole wall may collapse. The pile 13 can be reliably buried without any holes, and the pile 13 can be driven at the same time as the ground excavation. It can greatly improve the work.

In this embodiment, since the down-the-hole hammer 12 is used as a drilling machine, it is possible to reliably and effectively perform pre-digging even when rock is present in the ground. Further, the casing 9 has a pair of open / close side plates 15, 15, each of which has a vertically long band-shaped substrate 14, and is formed in an arc-shaped cross section, and one side edge of each of which is hinged to both side edges of the vertically long band-shaped substrate 14. Since the down-the-hole hammer 12 and the air supply pipe 16 for supplying air to the down-the-hole hammer 12 are integrally provided inside each opening / closing side plate 15, a pair of punches are provided on both sides in the casing 9. ,
The pile 13 can be inserted between the two drills, whereby the drill and the pile 13 can be arranged in the casing 9 in a well-balanced manner, and the excavating ability can be enhanced. Further, both the open / close side plates 15, 15 can be locked at the closed position by the lock means 18.

In this embodiment, the down-the-hole hammer 12 is used as a drilling machine for pre-digging, but an earth auger may be used as the drilling machine. In addition, the pile 13 is exemplified by an H-section steel, but L-section steel, I-section steel, T-section steel, and the like, a steel pipe other than a section steel, and a concrete pile can also be used.

FIG. 16 shows another embodiment. In the above embodiment, the casing 9 is vertically split so as to have a double door opening. In this embodiment, a normal cylindrical casing is used. 9A, this casing 9
A is equipped with a drilling machine 12 such as a dozer hole hammer, and a rotary drive unit 6 is attached to the upper end thereof so that a pile 13 made of H-shaped steel or the like can be inserted into the casing 9A. This is the same as the above embodiment.

In this embodiment, a boom attached to the traveling vehicle 2 is used as the suspension means 3, and the casing 9 A is suspended on the boom via the rotary drive device 6.

On the other hand, a lining plate 50 generally laid on the site in this type of work is used at a location near the pile driving,
A box-shaped pile standing case 51 is attached thereto by welding, bolting, or the like, and the lower end of the pile 13 is inserted into the pile standing case 51 with a hanging rope from the end of the boom 3 so that the pile 13 is attached as shown. It stands against the pile standing case 51.

In this state, the casing 9A suspended by the suspension means 3 is operated from the traveling carriage 2 to
Is inserted into the stake 13 from its lower open end, the casing 9A is externally fitted to the stake 13, and the pin insertion holes 52, 5 provided in both are inserted.
At the position where 3 coincides, the lock pin 54 is inserted into both pin insertion holes 5.
2 and 53, and the pile 13 is held by the lock pin 54 in the casing 9A. Next, as shown in FIG. 1B, the casing 9A and the pile 13 suspended by the boom 3 as the suspending means are attached to the pile 13 at a predetermined embedding point while the douser hole hammer 12 is pierced.
And the casing 9A is buried. When the upper end of the pile 13 and the casing 9A are buried close to the ground surface, the lock pin 54 holding both is removed, and only the pile 13 is buried in the ground. Only the lifting means 3 will lift it. This allows the pile 13 to be smoothly embedded in the ground while simultaneously inserting the casing 9A, the pile 13 and the drilling machine 12 into the ground.

According to this embedding method, it is not necessary to vertically divide the casing 9 into a double-opened structure as in the above-described embodiment, so that the construction can be simplified and the construction can be performed at low cost.

FIG. 17 shows another embodiment of the present invention. The difference from the embodiment of FIG. 16 is that the pile 13 is set up in advance in the embodiment shown in FIG. For this purpose, the pile standing case 51 is provided, but in this embodiment, a pile standing hole 56 having a soil wall collapse prevention cylinder 55 is formed at a location near the pile driving. The stake 13 is inserted into this, and the casing 9 suspended by the suspending means 3 is then inserted in the same manner as in the previous embodiment.
A is operated from the traveling trolley 2 to insert the casing 9A into the pile 13 from the lower open end thereof.
A is externally fitted, and a lock pin 54 is inserted across the two pin insertion holes 52 and 53 at a position where both pin insertion holes 52 and 53 match, and the pile 13 is held by the lock pin 54 in the casing 9A. Next, as shown in FIG. 3B, the casing 9 suspended by the boom 3 as a suspending means.
A and the pile 13 are pulled up from the hole 56 for standing the pile, and the pile 13 and the casing 9 </ b> A are buried in a predetermined burial place while the drilling operation of the douser hole hammer 12 is performed.
When the upper end of the casing 9A is buried close to the ground surface, the lock pin 54 holding them is removed, and only the casing 9A is pulled up by the hanging means 3 with only the pile 13 buried underground. Is the same as in the above embodiment.

According to this embodiment, the ordinary casing 9A can be used in the same manner as in the above-described embodiment, and the piles made of the earth wall collapse preventing cylinder 55 consisting of a normal large-diameter casing are simply placed underground. Since only the erecting hole 56 needs to be formed, there is an advantage that the construction cost is very low.

[0039]

According to the pile driving method according to the first aspect of the present invention, a casing is provided with a drilling machine inside the casing, and a casing is used inside the casing so that the pile can be inserted in parallel with the drilling machine. After driving the drilling machine while inserting and holding the pile inside the casing to penetrate the casing to a predetermined depth in the ground, the holding of the pile inside the casing is released, and the casing is left while the pile is kept in the ground. As the casing is pulled up, the hole walls do not collapse when the casing is pulled up, and the pile can be securely inserted, and the pile can be driven at the same time as the ground is drilled. Work can be greatly improved.

According to the pile driving method according to the second aspect of the present invention, a drill is provided inside the casing, and the casing is divided vertically so that the pile can be inserted into the casing in parallel with the drill. Using a casing configured to be possible, after driving the drilling machine with the pile inserted and held inside the casing and penetrating the casing to a predetermined depth in the ground, release the holding of the pile inside the casing,
Since the casing is pulled up while leaving this pile in the ground, the hole wall does not collapse when the casing is pulled up, and the pile can be securely inserted,
Moreover, since the pile can be driven simultaneously with the excavation in the ground, the driving work of the pile can be greatly improved.

According to the third aspect of the present invention, the casing is vertically connected by the suspending means so as to be able to move up and down. The casing is provided with a drilling machine inside the casing and the drilling machine is installed inside the casing. And a pile holding means (in the embodiment, pin insertion holes 52 and 53 and a lock pin 54) for holding the pile inserted inside the casing. However, there is an advantage that the construction can be performed very easily and inexpensively.

According to the fourth aspect of the present invention, a casing is vertically connected to a lower portion of an elevator frame which can be moved up and down along a leader, and this casing is used for a drilling machine for pre-digging inside the casing. The casing is divided vertically so that the pile can be inserted into the casing in parallel with the drilling machine so that the pile can be inserted into the casing and can be opened and closed, and a hanging insertion means for suspending and inserting the pile inside the casing. And a pile holding means for holding the pile inserted inside the casing, so that the pile driving can be performed easily.

[Brief description of the drawings]

FIG. 1 is a side view showing a pile driving device according to the present invention.

FIG. 2 is a longitudinal sectional view showing an upper end side of a closed casing.

FIG. 3 is a longitudinal sectional view showing a lower end side of a closed casing.

FIG. 4 is a sectional view taken along line VV of FIG. 2;

FIG. 5 is a sectional view taken along line WW of FIG. 2;

FIG. 6 is a sectional view taken along line XX of FIG. 2;

FIG. 7 is a longitudinal sectional view showing the upper end side of the opened casing.

FIG. 8 is a longitudinal sectional view showing the upper end side of the opened casing.

FIG. 9 is a cross-sectional view, similar to FIG. 5, showing an open / close state of both open / close side plates of the casing.

FIG. 10 is a front view showing the open / closed state of both open / close side plates of the casing, as viewed from the open side of the casing.

FIG. 11 is a cross-sectional view, similar to FIG. 6, showing an open / close state of both open / close side plates of the casing.

FIG. 12 is a front view showing the open / close state of both open / close side plates of the casing, as viewed from the hinge side of the casing.

13A is a cross-sectional view of the upper end portion of the casing, showing the hanging insertion means and the pile holding means, FIG. 13B is a plan view of FIG. 13A, and FIG. 13C is a sectional view of FIG. It is YY line sectional drawing.

FIG. 14 is a cross-sectional view of the upper end portion of the casing, showing a pile pushing-down means.

FIG. 15 is a schematic explanatory view showing a series of steps of the pile driving method according to the present invention.

FIG. 16 is a view showing a construction state of another embodiment of the present invention, wherein (A) is a front view and (B) is a front view of a main part.

FIG. 17 is a view showing a construction state of another embodiment of the present invention, wherein (A) is a front view and (B) is a front view of a main part.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Leader 6 Rotation drive device 9 Casing 9A Casing 10 Upper fixed plate 12 Down the hole hammer (drilling machine) 13 Pile (H-shaped steel) 14 Substrate 15 Opening / closing side plate 16 Air supply pipe 17 Hinge 18 Locking means 19 Grout supply pipe 20 Mounting plate 21 Axis 22 Lock pin 33 Hanging insertion means 34 Pile holding means 45 Lock pin 46 Pile pushing down means 52 Pile standing case 56 Pile standing hole

Claims (4)

[Claims] 1. A casing provided with a drilling machine inside a casing, and a casing in which a pile can be inserted in parallel with the drilling machine is used inside the casing. The pile is inserted and held inside the casing, After piercing the casing to a predetermined depth in the ground while driving the drilling machine in this state,
A pile driving method in which the holding of the pile inside the casing is released, and this pile is left in the ground and the casing is lifted. 2. A casing provided with a drilling machine inside the casing, and a casing which is divided vertically and opened and closed so that a pile can be inserted in parallel with the drilling machine inside the casing. After inserting the pile inside the casing and holding it, and driving the drilling machine in this state, penetrating the casing to a predetermined depth in the ground, release the holding of the pile inside the casing and leave this pile in the ground. Pile driving method that lifts the casing. 3. A casing is vertically connected by a suspending means so as to be able to move up and down. The casing is equipped with a drilling machine inside the casing, and a pile can be inserted inside the casing in parallel with the drilling machine. And a pile driving device comprising a pile holding means for holding a pile inserted inside the casing. 4. A casing is vertically connected to a lower portion of an elevator frame which can be moved up and down along a leader. The casing is equipped with a drilling machine inside the casing and a pile is inserted inside the casing in parallel with the drilling machine. The casing is divided vertically so that it can be opened and closed so that it can be opened and closed, and a hanging insertion means for hanging and inserting the pile inside the casing,
A pile driving device comprising: a pile holding means for holding a pile inserted into a casing.