JP2020122379A - Attachment for driving down pile and pile press-in method - Google Patents

Abstract

To provide an attachment for driving down a pile for easily adjusting a height of a top end of the pile, and a pile press-in method.SOLUTION: An attachment 2 for driving down a pile P used when an existing pile P is pressed in the foundation has a column part 40 which is held by a chuck 20 of a pile press-in machine 1, and a holding part 41 which is mounted on the lower end of the column part 40 and holds a top end of the existing pile P. A method for pressing-in an existing pile P into the foundation includes the steps of: holding the pile P by a chuck 20 of a pile press-in machine 1 and presses-in the pile P into the foundation; mounting an attachment 2 to the top end of the existing pile P; and holding a column part 40 with the chuck 20 of the pile press-in machine 1, and pressing-in the existing pile P into the foundation.SELECTED DRAWING: Figure 11

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pile down attachment used when press-fitting a pile into the ground and a method of press-fitting the pile.

As a method of burying various steel pipe piles and shaped steel piles by embedding them in the ground, by grasping the upper end of the existing pile embedded in the ground with a clamp and taking a reaction force, the chuck holding the pile is moved up and down. , A construction technique is known in which new piles are sequentially pressed into positions adjacent to existing piles.

The pile press-fitting machine used for such construction has a saddle fixed to an existing pile through a plurality of clamps, and a slide frame that can move in the front-rear direction with respect to the saddle, and is pivotally mounted on the slide frame. A chuck that can be moved up and down is attached to the leader mast. As a pile used for press-fitting, a pile such as a steel sheet pile, a steel pipe sheet pile, a steel pipe pile, or a concrete pile is known.

Here, in order to enable the press-fitting of the pile further downward, in Patent Document 1, the guide rail is extended below the clamp device, and the pile press-fitting is configured to move the chuck along the guide rail. Machine is disclosed. Further, Patent Document 2 discloses a self-propelled device that integrally has a box-shaped auxiliary clamp at the lower end of a pillar having a cross-sectional shape that is installed in a pile insertion hole formed in a chuck of a pile press-fitting machine.

JP, 2013-163928, A Japanese Utility Model Laid-Open No. 58-90236 (Microfilm of Japanese Patent Application No. 56-185648)

By the way, depending on the construction site, for example, it may be required to press-fit the top end of the pile to a predetermined depth in the ground. Further, the ground is not always flat, and it may be necessary to match the height of the top end of each pile press-fitted into the undulating ground with the ground.

An object of the present invention is to provide an attachment for hitting down a pile and a method for press-fitting the pile so that the height of the top end of the pile can be easily adjusted.

According to the present invention, it is an attachment for downing a pile used when press-fitting an existing pile into the ground, and a pillar portion that is gripped by a chuck of the pile press-fitting machine, and is attached to the lower end of the pillar portion. An attachment for hitting down a pile is provided, which has a gripping portion that grips the top end of the pile.

In this attachment, the gripping portion includes a base plate, a fixing mechanism that is provided on an upper surface side of the base plate and is fixed to a lower end of the pillar portion, and a ceiling of an existing pile provided on a lower surface side of the base plate. It may have a gripping mechanism for gripping the end. The grip may be detachably attached to the lower end of the column. In addition, a fitting portion that fits with a joint portion of an existing pile that is adjacent to the press-fitted pile may be provided on the pillar portion.

Further, according to the present invention, there is provided a method for press-fitting an existing pile into the ground, a step of gripping the pile with a chuck of a pile press-fitting machine and press-fitting into the ground, and attaching the attachment to a top end of the existing pile. There is provided a method for press-fitting a pile, comprising: a step and a step of gripping the pillar portion with a chuck of the pile press-fitting machine and press-fitting an existing pile into the ground.

In this press-fitting method, in the step of attaching the attachment to the top end of the existing pile, after the grip portion is attached to the top end of the existing pile in a state of being detached from the lower end of the support column, the pile press-fitting machine. The gripping portion may be attached to the lower end of the column portion that is passed through the chuck. Further, in the step of gripping the pillar portion with the chuck of the pile press-fitting machine and press-fitting the existing pile into the ground, the fitting portion provided on the pillar portion is an existing pile adjacent to the pile to be press-fitted. You may make it fit in the joint part of. Alternatively, the existing pile may be press-fitted using the attachment, and then the pile press-fitting machine may be moved. Alternatively, the pile press-fitting machine may be moved first, and then the existing piles may be press-fitted using the attachment.

According to the present invention, the attachment is attached to the top end of the existing pile, the column part of the attachment is gripped by the chuck of the pile press-fitting machine, and the pile is press-fitted into the ground, thereby facilitating the height of the top end of the pile. Can be adjusted to.

It is a side view of a pile press-fitting machine. It is a top view of a pile press-fitting machine. It is a front view of a pile press-fitting machine. It is the front view (a) and side view (b) of the attachment which concerns on embodiment of this invention. It is a top view of a holding part. It is a front view of a holding part. It is a side view of a holding part. It is the front view (a) and side view (b) of a pillar part. It is explanatory drawing of the state which attaches the holding part of an attachment to the crown of the existing pile. It is explanatory drawing of the state which attaches a holding part to the lower end of a pillar part. It is explanatory drawing of the state which further presses the existing pile into the ground using an attachment. It is explanatory drawing of the state which raised the chuck. It is explanatory drawing of the state which further presses the existing pile into the ground using an attachment. It is explanatory drawing of the state which raised the chuck. It is explanatory drawing of the state which lifted the pile press-fitting machine above the existing pile using a chuck as a support point. It is an explanatory view of the state where the pile press-fitting machine was self-propelled backward by the width of one pile. It is an explanatory view of a state where the pile press-fitting machine is lowered and the pile press-fitting machine is fixed again to the existing pile by the clamp. It is explanatory drawing of the state which raised the attachment with the chuck. It is an explanatory view of an embodiment in which the pile press-fitting machine is moved first, and then the existing piles are press-fitted using the attachment, and the pile press-fitting machine is lifted above the existing piles by using the chuck as a support point. It is explanatory drawing of the opened state. It is an explanatory view of an embodiment in which the pile press-fitting machine is moved first, and then the existing piles are press-fitted using the attachment, and the pile press-fitting machine is self-propelled backward by the width of one pile. It is explanatory drawing of the made state. It is an explanatory diagram of an embodiment in which the pile press-fitting machine is moved first, and then the existing piles are press-fitted using the attachment, the pile press-fitting machine is lowered, and the pile press-fitting machine is clamped to the existing pile. It is explanatory drawing of the state fixed again. It is an explanatory view of a form in which the step of press-fitting the pile into the ground and the step of further press-fitting the top of the pile to the desired depth are alternately performed.A new pile is press-fitted into the ground adjacent to the front of the existing pile. Indicates the state to do. It is an explanatory view of a form in which the step of press-fitting the pile into the ground and the step of further press-fitting the top end of the pile to the desired depth are alternately performed, by moving the chuck onto the existing pile at the rear, Shown with the attachment attached to the top of the existing pile in. It is an explanatory view of a form in which the step of press-fitting the pile into the ground and the step of further press-fitting the top end of the pile to the desired depth are alternately performed, and the top end of the existing pile at the rear is further increased to the desired depth. It shows the state of being pressed into the ground. It is an explanatory view of a state in which a plurality of piles are arranged and the heights of the tops are aligned and press-fitted into the ground while the pile press-fitting machine is self-propelled forward. It is explanatory drawing of the state which adjusts the height of the top of each existing pile using an attachment, making a pile press-fitting machine self-propelled toward the back. It is the front view (a) and side view (b) of the support|pillar part of the attachment concerning other embodiment. FIG. 25 is a sectional view taken along line AA, BB, and CC of FIG. It is the DD sectional view of FIG. It is a top view of the holding part of the attachment concerning other embodiments. It is a front view of the holding part of the attachment concerning other embodiments. It is a side view of the holding part of the attachment concerning other embodiments.

Embodiments of the present invention will be described below with reference to the drawings. In the present specification and the drawings, elements having substantially the same functional configuration are designated by the same reference numerals, and duplicate description will be omitted. In addition, in the present specification, the front is a direction in which press-fitting construction is performed by the pile press-fitting machine 1, and in FIGS. 1 and 2, the right side is the front and the left side is the rear.

As shown in FIGS. 1 to 3, a plurality of clamps 11 are attached to a lower portion of a saddle 10 which is a main body of the pile press-fitting machine 1. Each clamp 11 is composed of a fixed claw 12 and a movable claw 13, and the movable claw 13 approaches and separates from the fixed claw 12 by the operation of a cylinder incorporated in the movable claw 13. By operating the cylinder, the top end of the existing pile P is sandwiched between the fixed pawl 12 and the movable pawl 13, and the saddle 10 is fixed to the existing pile P and the existing pile P is opened. You can switch. In FIG. 1, the tops of the existing three piles P are clamped by the clamps 11 to fix the saddle 10, and one new pile P is press-fitted in front of the three piles P. It shows the state. In the embodiment, a U-shaped steel sheet pile is shown as an example of the pile P.

A slide frame 15 that is slidable in the front-rear direction with respect to the saddle 10 is provided on the upper portion of the saddle 10. A leader mast 16 serving as a turning base is mounted on the slide frame 15. The turning of the leader mast 16 is performed by a rotary drive source (not shown) such as a motor provided on the lower surface side of the leader mast 16, for example.

In front of the leader mast 16, a chuck 20 that can move up and down along an elevating guide 17 is attached. The chuck 20 has a structure in which a chuck main body 22 is attached to a chuck frame 21 that is attached to a lift guide 17 in front of the reader mast 16 so as to be lifted and lowered. The entire chuck 20 (chuck frame 21 and chuck body 22) is integrally lifted by the expansion and contraction operation of the main cylinder 25. The rod side of the main cylinder 25 is attached to the leader mast 16, and the tube side is attached to the chuck 20 (chuck frame 21). Therefore, the chuck 20 moves up with respect to the leader mast 16 by the extension operation of the main cylinder 25, and the chuck 20 descends with respect to the leader mast 16 by the shortening operation of the main cylinder 25.

The chuck body 22 is rotatably attached to the chuck frame 21. The chuck main body 22 has a tubular shape as a whole, and a U-shaped opening portion 26 penetrating in the vertical direction in a plan view is provided inside the chuck main body 22. The pile P which is a press-fitting object is vertically passed through the opening 26.

A fixed claw 30 and a movable claw 31 are provided on the lower inside of the chuck body 22 so as to face each other in the horizontal direction. The movable claw 31 is moved toward and away from the fixed claw 30 by the operation of the hydraulic cylinder 32 that is a pressing mechanism.

As shown in FIGS. 4( a) and 4 (b ), the attachment 2 according to the embodiment of the present invention has a support column 40 gripped by the chuck 20 of the pile press-fitting machine 1 and a pin 42 at the lower end of the support column 40. Has a grip portion 41 that is detachably attached and that grips the top end of the pile P pressed into the ground. The grip portion 41 may be detachably attached to the lower end of the support column 40 with a bolt.

As shown in FIGS. 5 to 7, the grip portion 41 includes a base frame 45, and a fixing mechanism 46 fixed to the lower end of the support column 40 is provided on the upper surface side of the base frame 45. A gripping mechanism 47 that grips the top end of the pile P press-fitted into the ground is provided on the lower surface side.

The gripping mechanism 47 has a fixed claw 50 and a movable claw 51 that are provided to face each other in the horizontal direction. The movable claw 51 is moved toward and away from the fixed claw 50 by the operation of the hydraulic cylinder 52 that is a pressing mechanism. The operation of the hydraulic cylinder 52 of the gripping mechanism 47 and the operation of the hydraulic cylinder 32 of the chuck 20 described above can be individually controlled.

The fixing mechanism 46 includes, for example, an outer plate 55 and an inner plate 56, and a gap is formed between the outer plate 55 and the inner plate 56 for inserting the lower end portion 58 of the column 40 described below. ing. Further, the outer plate 55 and the inner plate 56 are provided with holes 57 into which the pins 42 are inserted.

As shown in FIGS. 8A and 8B, the support column 40 has a cross-sectional shape similar to the pile P that is passed through the opening 26 of the chuck body 22, and in this embodiment, U It has a cross-sectional shape that is almost the same as the shape steel sheet pile. The lower end of the column 40 is a lower end portion 58 that is inserted into the gap formed between the outer plate 55 and the inner plate 56 described above. The lower end portion 58 is provided with a hole 59 into which the pin 42 is inserted. Further, a fitting portion 60 that fits with the joint portion of the U-shaped steel sheet pile, which is the pile P, is provided on the side of the support column portion 40.

Next, a method of press-fitting the pile P into the ground to a desired depth using the attachment 2 configured as above will be described.

First, the pile press-fitting machine 1 presses the pile P into the ground. In this case, the upper end of the existing pile P embedded in the ground in advance is gripped by the clamp 11 to take the reaction force, and the pile P newly press-fitted into the ground is gripped by the chuck 20. Then, when the pile P is press-fitted into the ground by the stroke of the main cylinder 25, the grip of the pile P is once released, and the chuck 20 is lifted by the extension operation of the main cylinder 25. Then, the pile P is gripped again at the position where the chuck 20 is raised. Then, the chuck 20 is lowered by the shortening operation of the main cylinder 25, and the pile P is further pressed into the ground. By repeating this operation, the pile P is pressed into the ground to a predetermined depth, and the new pile P is pressed into a position adjacent to the front of the existing pile P. In this way, the plurality of piles P are press-fitted side by side with the heights of the tops aligned.

Next, as shown in FIGS. 9 and 10, the attachment 2 is attached to the top end of the existing pile P. In the step of attaching the attachment 2 to the top end of the existing pile P as described above, first, as shown in FIG. 9, the pin 42 is pulled out from the holes 57 and 59, and the attachment 2 is attached to the support column 40 and the grip portion 41. The grip portion 41 is attached to the top end of the existing pile P in a state where the grip portion 41 is separated and removed from the lower end of the pillar portion 40. In this case, in the gripping mechanism 47 on the lower surface side of the base frame 45, the movable claw 51 is moved closer to the fixed claw 50 by the operation of the hydraulic cylinder 52, and the ceiling P of the pile P is moved between the movable claw 51 and the fixed claw 50. Hold the edge.

Then, after the grip portion 41 is attached to the top end of the existing pile P in the state where the grip portion 41 is detached from the lower end of the pillar portion 40 as described above, the opening portion of the chuck 20 of the pile press-fitting machine 1 as shown in FIG. The grip portion 41 is attached to the lower end of the support column portion 40 which is passed through from above 26. After mounting the grip portion 41 on the top end of the existing pile P and attaching the grip portion 41 to the lower end of the pillar portion 40 that has passed through the opening 26 of the chuck 20 of the pile press-fitting machine 1 from above, the grip portion 41 is already installed. It can also be attached to the top of the pile P. In this way, after attaching the grip portion 41 to the lower end of the support column 40 which is passed through the opening 26 of the chuck 20 of the pile press-fitting machine 1 from above, the grip portion 41 is attached to the top end of the existing pile P, the grip is performed. The portion 41 makes it easy to determine the position where the top end of the existing pile P is gripped. Since the column 40 has the same cross-sectional shape as the pile P that is passed through the opening 26 of the chuck 20 (in this embodiment, the cross-sectional shape is approximately equal to that of the U-shaped steel sheet pile), the grip portion If 41 is removed, the column 40 can be smoothly passed from above through the opening 26 of the chuck 20 while being suspended by, for example, a crane. Then, the lower end portion 58 of the support column 40 inserted into the opening 26 of the chuck 20 from above is provided between the outer plate 55 and the inner plate 56 of the grip portion 41 that is attached to the top end of the pile P in advance. Insert into the formed gap. Then, the holes 57 provided in the outer plate 55 and the inner plate 56 and the holes 59 provided in the lower end portion 58 are aligned with each other, and the pins 42 are inserted into the holes 57 and the holes 59, so that they are grasped at the lower ends of the support columns 40. Attach the part 41.

Next, the column 20 of the attachment 2 is gripped by the chuck 20 of the pile press-fitting machine 1 to further press-fit the existing pile P into the ground. In this case, first, as shown in FIG. 10, the support column 40 of the attachment 2 is gripped by the chuck 20 in a state where the chuck 20 is raised by the extension operation of the main cylinder 25. The chuck 20 holds the supporting column 40 by moving the hydraulic cylinder 32 to bring the movable claw 31 closer to the fixed claw 30 and gripping the supporting column 40 between the movable claw 31 and the fixed claw 30. Done.

Next, as shown in FIG. 11, the chuck 20 is lowered by the shortening operation of the main cylinder 25 while maintaining the state in which the support column 40 of the attachment 2 is held by the chuck 20, and the height of the top end of the main cylinder 25 is lowered. The existing pile P is further press-fitted into the ground to a position where the stroke becomes deeper. Further, when the pile P is press-fitted into the ground by using the attachment 2 as described above, the fitting portion 60 provided on the column portion 40 of the attachment 2 is press-fitted for the posture stability when the pile press-fitting machine is self-propelled. The fitting portion of the existing pile P adjacent to the pile P is fitted. Then, when the chuck 020 is lowered, the movable claw 31 is separated from the fixed claw 30 by the operation of the hydraulic cylinder 32, and the grip of the column 40 by the movable claw 31 and the fixed claw 30 is released.

Next, as shown in FIG. 12, the chuck 20 is raised by the extension operation of the main cylinder 25. Then, the support column 40 of the attachment 2 is gripped again by the chuck 20 at the position where the chuck 20 is raised. In addition, similarly, when the support column 40 is gripped by the chuck 20, the movable claw 31 is moved closer to the fixed claw 30 by operating the hydraulic cylinder 32, and the support column 40 is gripped between the movable claw 31 and the fixed claw 30. It is done by

Next, while maintaining the state in which the support column 40 of the attachment 2 is gripped by the chuck 20, as shown in FIG. 13, the chuck 20 is lowered again by the shortening operation of the main cylinder 25, and the pile is stroked by the stroke of the main cylinder 25. Press P into the ground. Then, when the chuck 20 is lowered, the movable claw 31 is separated from the fixed claw 30 by the operation of the hydraulic cylinder 32, and the grip of the support column 40 by the movable claw 31 and the fixed claw 30 is released. By repeating this operation a predetermined number of times, the attachment 2 is used to press-fit until the height of the top of the existing pile P reaches a predetermined position.

In this way, after press fitting the height of the top end of the existing pile P to a predetermined position, as shown in FIG. 14, the chuck 20 is lifted by the extension operation of the main cylinder 25. Then, the support column 40 of the attachment 2 is gripped again by the chuck 20 at the position where the chuck 20 is raised. In addition, similarly, when the support column 40 is gripped by the chuck 20, the movable claw 31 is moved closer to the fixed claw 30 by operating the hydraulic cylinder 32, and the support column 40 is gripped between the movable claw 31 and the fixed claw 30. It is done by

Next, with the chuck 20 holding the column 40 of the attachment 2, the holding by the clamps 11 at the bottom of the saddle 10 is released. Next, as shown in FIG. 15, the main cylinder 25 is shortened while the support column 40 of the attachment 2 is being held by the chuck 20, so that the chuck 20 is used as a support point and the pile press-fitting machine 1 (saddle). 10) is lifted above the three existing piles P that have been sandwiched so far.

Next, as shown in FIG. 16, the pile press-fitting machine 1 (saddle 10) is moved by one slide of the pile P by sliding the slide frame 15 while the chuck 20 holds the support column 40 of the attachment 2. Move backward (self-propelled) by the width of. Then, as shown in FIG. 17, the pile press-fitting machine 1 (saddle 10) is lowered by the extension operation of the main cylinder 25, and the three existing clamps are again provided by the three clamps 11 provided at the lower portion of the saddle 10. The piles P are respectively sandwiched, and the saddle 10 of the pile press-fitting machine 1 is fixed to the existing piles P to take a reaction force.

Next, in the grip portion 41 (grip mechanism 47) of the attachment 2, the movable claw 51 is separated from the fixed claw 50 by operating the hydraulic cylinder 52, and the grip of the top end of the pile P is released. After that, as shown in FIG. 18, the chuck 20 is lifted by the extension operation of the main cylinder 25 while the pillar 20 of the attachment 2 is being held by the chuck 20. This raises the attachment 2 above the existing pile P press-fitted until the height of the top end reaches a predetermined position. In this case, when the attachment 2 is raised by the stroke of the main cylinder 25, the grip of the support column 40 of the attachment 2 is once released, and the chuck 20 is lowered by the shortening operation of the main cylinder 25. Then, the support column 40 of the attachment 2 is gripped again at the position where the chuck 20 is lowered. Then, the attachment 2 is raised by the extension operation of the main cylinder 25, and the attachment 2 is further raised. By repeating such an operation, the gripping portion 41 of the attachment 2 is attached to the next existing pile P adjacent to the existing pile P that has been press-fitted until the height of the top end reaches a predetermined position using the attachment 2. Raise Attachment 2 until it is above the top of. The fitting portion 60 provided on the support column 40 of the attachment 2 is fitted to the joint portion of the existing pile P adjacent to the pile P to be press-fitted to release the grip of the support column 40 of the attachment 2. Then, when the chuck 20 is lowered, the height of the attachment 2 can be kept constant, and the chuck 20 can be lowered easily. In addition, when the attachment 2 is lifted in this way, the attachment 2 may be suspended by a crane or the like in order to prevent the attachment 2 from falling.

Thereafter, the slide frame 15 slides to move the chuck 20 above the next existing pile P adjacent to the existing pile P that has been press-fitted using the attachment 2 until the height of the top end reaches a predetermined position. To move. Then, by attaching the attachment 2 to the top end of the next existing pile P, the state shown in FIG. 10 is obtained. Then, in the same manner, the height of the top end of the existing pile P is press-fitted sequentially toward the rear to a predetermined depth.

As described above, the attachment 2 is attached to the top end of the existing pile P, and the column portion 40 of the attachment 2 is gripped and press-fitted by the chuck 20 of the pile press-fitting machine 1 to increase the height of the top end of the pile P. It will be easy to adjust. As shown in this embodiment, the grip portion 41 is removed from the lower end of the support column 40, and the grip portion 41 is first attached to the top end of the existing pile P, and then the chuck 20 of the pile press-fitting machine 1 is installed. If the grip portion 41 is attached to the lower end of the support column 40 that is passed through the opening 26 from above, it is not necessary to insert the attachment 2 into the opening 26 of the chuck 20 from below, and the work is easy. The attachment 2 can be attached even at a site where there is no space below. Further, by fitting the fitting portion 60 provided on the column portion 40 of the attachment 2 to the joint portion of the existing pile P adjacent to the pile P to be press-fitted, the height of the top end becomes a predetermined position. When the attachment 2 is lifted above the existing piles P that have been press-fitted until, the height of the attachment 2 can be kept constant even if the grip of the support column 40 of the attachment 2 is released. The work of pulling out is easy.

Although the preferred embodiment of the present invention has been described above, the present invention is not limited to this example. It is obvious to those skilled in the art that various modifications or modifications can be conceived within the scope of the technical idea described in the claims, and of course, the technical scope of the present invention is also applicable to them. Be understood to belong to.

For example, the length (height) of the column 40 of the attachment 2 may be appropriately changed according to the depth at which the top end of the pile is press-fitted. When the top end of the pile is pressed deep into the ground, the length of the column 40 of the attachment 2 may be increased, and when the depth is shallow, the length of the column 40 of the attachment 2 may be shortened. Plural kinds of strut portions 40 having different lengths may be prepared, and the plural kinds of strut portions 40 may be selectively used according to the depth at which the top end of the pile is press-fitted. In that case, the grip part 41 can be common.

The grip portion 41 may be attached to the lower end of the support column 40 by pin connection, bolt connection, or connection using a suitable clamp. Also, when attaching the grip portion 41 of the attachment 2 to the top end of the existing pile P, in addition to the hydraulic cylinder 52, pin connection, bolt connection, connection using an appropriate clamp, or the like may be used.

Further, in the above, the attachment 2 is first used to press-fit until the height of the top of the existing pile P reaches a predetermined position, and then the pile press-fitting machine 1 (saddle 10) is moved (self-propelled). The example in which the pile press-in machine 1 (saddle 10) is moved (self-propelled) first, and then the attachment 2 is used to set the height of the top of the existing pile P to a predetermined position. You may press-fit until it becomes.

That is, as shown in FIG. 10, first, the attachment 2 is attached to the top end of the existing pile P, and then the support column 40 of the attachment 2 is held by the chuck 20 and is located below the saddle 10. The clamping by each clamp 11 is released. Then, as shown in FIG. 19, the main cylinder 25 is shortened while the support column 40 of the attachment 2 is being held by the chuck 20, so that the chuck 20 is used as a support point and the pile press-fitting machine 1 (saddle 10) is used. ) Is lifted above the three existing piles P that have been sandwiched so far.

Next, as shown in FIG. 20, the pile press-fitting machine 1 (saddle 10) is moved to one pile P by sliding the slide frame 15 while the chuck 20 holds the support column 40 of the attachment 2. Move backward (self-propelled) by the width of. Then, as shown in FIG. 21, the pile press-fitting machine 1 (saddle 10) is lowered by the extension operation of the main cylinder 25, and the three existing clamps are again provided by the three clamps 11 provided at the lower portion of the saddle 10. The piles P are respectively sandwiched, and the saddle 10 of the pile press-fitting machine 1 is fixed to the existing piles P to take a reaction force.

After that, press-fitting is performed until the height of the top of the existing pile P to which the attachment 2 is attached reaches a predetermined position, and after the press-fitting is completed, the height of the top of the existing pile P reaches a predetermined position using the attachment 2. The attachment 2 is raised until it is located above the top of the next existing pile P adjacent to the existing pile P that has been press-fitted. Further, by the slide movement of the slide frame 15, the chuck 20 is placed above the next existing pile P adjacent to the existing pile P that has been press-fitted until the height of the top end reaches a predetermined position by using the attachment 2. To move. Then, by attaching the attachment 2 to the top end of the next existing pile P, the state shown in FIG. 10 is obtained. Then, in the same manner, the height of the top end of the existing pile P is press-fitted sequentially toward the rear to a predetermined depth.

Further, as shown in FIGS. 22 to 24, it is possible to alternately perform the step of press-fitting the pile P into the ground and the step of further press-fitting the top end of the pile P into the ground to a desired depth. That is, first, as shown in FIG. 22, by the pile press-fitting machine 1, a new pile P is formed adjacent to the front of the existing pile P (in FIGS. 22 to 24, the left side is the front side and the right side is the rear side). Press into the ground.

Next, as shown in FIG. 23, the leader mast 16 of the pile press-fitting machine 1 is swung to move the chuck 20 onto the existing pile P at the rear. Then, the attachment 2 is attached to the top end of the existing pile P on the rear side, and the column 20 of the attachment 2 is gripped by the chuck 20 of the pile press-fitting machine 1.

As described above, when the chuck 20 of the pile press-fitting machine 1 is moved onto the rear existing pile P, the attachment 2 is attached to the top end of the rear existing pile P before turning the leader mast 16. If the grip portion 41 is attached in advance, after the leader mast 16 is rotated to move the chuck 20 onto the existing pile P on the rear side, the pillar portion is provided in the opening 26 of the chuck 20 of the pile press-fitting machine 1. The grip portion 41 can be attached to the lower end of the column portion 40 through which 40 is passed.

Then, the chuck 20 is lowered by the shortening operation of the main cylinder 25, and as shown in FIG. 24, the top end of the existing pile P is further pressed into the ground to a desired depth. Thereafter, similarly, the step of press-fitting a new pile P into the ground in front of the existing pile P and the step of press-fitting the top end of the rear-side existing pile P further into the ground to a desired depth are alternately performed.

In addition, as shown in FIG. 25, while the pile press-fitting machine 1 is self-propelled forward, a plurality of piles P are arranged side by side, and the heights of the tops are aligned and press-fitted into the ground. In addition, it is possible to appropriately adjust the height of the top end of the existing pile P while the pile press-fitting machine 1 is self-propelled rearward. 25 and 26, the left side is the front side and the right side is the rear side.

That is, the ground is not always flat, and depending on the site, it may be necessary to adjust the height of the top of each pile pressed into the undulating ground according to the shape of the ground. .. In such a case, as shown in FIG. 25, while the pile press-fitting machine 1 is self-propelled forward, a plurality of piles P are arranged and the heights of the tops are aligned and press-fitted into the ground. After that, as shown in FIG. 26, the height of the top end of each existing pile P is appropriately adjusted using the attachment 2 while the pile press-fitting machine 1 is self-propelled rearward. Thereby, the height of the top of each pile P can be adjusted arbitrarily.

In addition, the attachment 2 according to the embodiment of the present invention may also be configured by a column portion 40' shown in FIGS. 27(a), (b), 28 and 29 and a grip portion 41' shown in FIGS. it can.

As shown in FIGS. 27(a), (b) 28, 29, the support column 40' has a U-shaped cross-sectional shape that allows it to pass through the opening 26 of the chuck body 22. A fitting portion 60 that fits with the joint portion of the U-shaped steel sheet pile that is the pile P is provided on the side of the portion 40′. Further, the lower end of the column portion 40' is a lower end portion 58 for connecting to the grip portion 41'. The lower end portion 58 is provided with a hole 59 into which the pin 42 is inserted. Further, a fitting portion 60 that fits with the joint portion of the U-shaped steel sheet pile, which is the pile P, is provided on the side of the support column portion 40.

As shown in FIGS. 30 to 32, the grip portion 41 ′ includes a base frame 45, and a fixing mechanism 46 fixed to the lower end portion 58 of the lower end of the column portion 40 ′ is provided on the upper surface side of the base frame 45. In addition, on the lower surface side of the base frame 45, a gripping mechanism 47 that grips the top end of the pile P press-fitted into the ground is provided.

The gripping mechanism 47 has a fixed claw 50 and a movable claw 51 that are provided to face each other in the horizontal direction. The movable claw 51 is moved toward and away from the fixed claw 50 by the operation of the hydraulic cylinder 52 that is a pressing mechanism.

The fixing mechanism 46 includes an outer plate 55 and an inner plate 56, and a gap is formed between the outer plate 55 and the inner plate 56 for inserting the lower end portion 58 of the column portion 40′ described above. .. Further, the outer plate 55 and the inner plate 56 are provided with holes 57 into which the pins 42 are inserted.

27(a), (b), 28, and 29, and the attachment 2 configured with the grip portion 41' shown in FIGS. 30 to 32, similarly, the top end of the existing pile P. Attaching the attachment 2 to the grip, gripping the column 40 of the attachment 2 with the chuck 20 of the pile press-fitting machine 1, and further press-fitting the existing pile P into the ground, the height of the top of the existing pile P is increased. Press-fitting can be performed until a predetermined position is reached. Further, according to this attachment 2, it is possible to use the grip portion 41 ′ in common and use the column portion 40 ′ corresponding to different pile types and pile sizes. Depending on the shape of the strut portion 40', for example, different pile types, different pile sizes, and different types, 400 mm width, 500 mm width, 600 mm width U-shaped steel sheet pile, and their respective types (II, III types, etc.), zero type steel sheet pile, In addition, it can be used for H-shaped steel sheet pile and I-shaped steel sheet pile.

The fitting portion 60 provided on the support column 40 of the attachment 2 may be provided on the entire length (total height) of the support column 40, or may be provided only on a part thereof. Further, the fitting portion 60 only needs to fit with the existing P joint portion, and does not necessarily have to have the same shape as the existing P joint portion. For example, a guide shape (groove shape) that fits outside the existing P joint portion may be used.

Although the U-shaped steel sheet pile is shown as an example of the pile P in the above, the present invention is also applicable to press-fitting a hat type steel sheet pile, a Z type steel sheet pile, a zero type steel sheet pile, a concrete sheet pile, a steel pipe sheet pile, a steel pipe pile, and other piles. Applicable.

Further, in the above, the form in which the existing pile P press-fitted into the ground by the pile press-fitting machine 1 is further driven down to a predetermined depth using the attachment 2 has been described, but the existing pile P is constructed by the press-fitting method. Not limited to The present invention is also applicable to existing piles P that have been constructed by various construction methods such as a hitting construction method, a drill construction method, a casing construction method, and the like.

INDUSTRIAL APPLICATION This invention can be applied to the construction field which press-fits a pile in the ground, and the construction field which pulls out a pile from the ground.

1 Pile press-fitting machine 2 Attachment P pile 10 Saddle 11 Clamp 12 Fixed claw 13 Movable claw 15 Slide frame 16 Leader mast 17 Lifting guide 20 Chuck 21 Chuck frame 22 Chuck body 25 Main cylinder 26 Opening 30 Fixed claw 31 Movable claw 32 Hydraulic cylinder 40 Columns 41 Grips 42 Pins 45 Base Frame 46 Fixing Mechanism 47 Gripping Mechanism 50 Fixed Claw 51 Movable Claw 52 Hydraulic Cylinder 55 Outer Plate 56 Inner Plate 57 Hole 58 Lower End 59 Hole 60 Fitting Part

Claims (9)

An attachment for pushing down a pile used when press-fitting an existing pile into the ground,
A pillar part that is gripped by the chuck of the pile press-fitting machine,
An attachment for hitting down a pile, comprising a gripping part that is attached to the lower end of the support column and that grips the top end of an existing pile. The grip portion includes a base plate,
A fixing mechanism provided on the upper surface side of the base plate, which is fixed to the lower end of the support column;
The pile attachment according to claim 1, further comprising a gripping mechanism that is provided on a lower surface side of the base plate and that grips a top end of an existing pile. The pile attachment according to claim 1 or 2, wherein the grip portion is detachably attached to a lower end of the column portion. The said pillar part is provided with the fitting part which fits with the joint part of the existing pile adjacent to the pile to press-fit, The pile as described in any one of Claims 1-3 characterized by the above-mentioned. Attachment for down. A method of press-fitting existing piles into the ground,
A process of gripping the pile with the chuck of the pile press-fitting machine and press-fitting it into the ground,
A step of attaching the attachment according to any one of claims 1 to 4 to a top end of an existing pile,
A method for press-fitting a pile, comprising a step of gripping the pillar portion with a chuck of the pile press-fitting machine and press-fitting an existing pile into the ground. A method for press-fitting a pile using the attachment according to claim 3,
In the process of attaching the attachment to the top of the existing pile,
After being attached to the top end of the existing pile, with the grip removed from the lower end of the column,
The method for press-fitting a pile according to claim 5, wherein the grip portion is attached to a lower end of the column portion that passes through a chuck of the pile press-fitting machine. A method for press-fitting a pile using the attachment according to claim 4,
In the step of gripping the pillar portion with the chuck of the pile press-fitting machine and press-fitting the existing pile into the ground, the fitting portion provided on the pillar portion is a joint of the existing pile adjacent to the press-fitting pile. The method for press-fitting a pile according to claim 5 or 6, characterized in that the pile is fitted into the portion. The method for press-fitting a pile according to any one of claims 5 to 7, characterized in that the existing pile is press-fitted using the attachment, and then the pile press-fitting machine is moved. The method of press-fitting a pile according to any one of claims 5 to 7, wherein the pile press-fitting machine is moved first, and then the existing pile is press-fitted using the attachment.

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