JP2004011337A - Pile press-fitting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily press-fit a pile into the ground with high precision by clamping an existing pile so as not to be shifted. <P>SOLUTION: This pile press-fitting device 1 is provided with a clamp 20 for clamping the existing pile P, and a pile press-fitting part 10 for pressing another pile P into the ground G with the reaction from the pile P clamped by the clamp 20. The clamp 20 has clamping surfaces 25 and 26 mutually opposed and to interpose the existing pile P between them. The clamping surfaces 25 and 26 have a plurality of protruding parts 30 and 31, the tip surfaces of which abut on the side surface of the pile P. The tip end surfaces of the protruding parts 30 and 31 are formed so that the vertical width is longer than the lateral width. In such a pile press-fitting device 1, the shifting of the clamp 20 to the existing pile P can be prevented by the vertical and lateral edges of the protruding parts 30 and 31 of the clamp. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a pile press-fitting device that presses a pile into the ground by taking a reaction force from an existing pile.
[0002]
[Prior art]
BACKGROUND ART Conventionally, as a device for providing a pile on the ground, a pile press-in device that presses a pile into the ground by taking a reaction force from an existing pile has been known. This pile press-fitting device is provided with a device body, a clamp provided at a lower portion of the device body, which clamps an existing pile, and a pile which is provided at a front end of the device body and which is pressed into the ground adjacent to the existing pile. The pile is press-fitted into the ground by lowering the chuck with the pile to be press-fitted in a state in which the existing chuck is sandwiched between the clamps and the reaction force is removed.
[0003]
The clamp in such a pile press-fitting device is formed in a bifurcated shape, and has side walls that face each other and have an insertion portion between which an existing pile is inserted. Members having a sandwiching surface for sandwiching the existing pile in the insertion portion are provided on both side wall surfaces which are arranged to face each other in the side wall portion and the existing pile is interposed therebetween.
That is, as shown in FIG. 6, one of the side wall surfaces is provided with a fixed holding member 70 fixed to the side wall surface, and the holding surface 90 of the fixed holding member 70 has Are provided with a plurality of convex portions 80,. In order to prevent the clamp from shifting mainly in the vertical direction with respect to the existing pile at the time of press-fitting of the pile, the distal end surface of the convex portion 80 has a rectangular shape having a lateral width longer than the vertical width, that is, a direction in which the clamp is shifted. It has a shape extending in a direction orthogonal to.
Also, on the other side wall surface, there are two movable pinches that can move toward the fixed pinching member 70 and press the existing stake in the insertion portion against the fixed pinching member, and can rotate in a direction parallel to the side wall surface. A member 71, 71 is provided, and a plurality of convex portions 81,... Of which the tip surface abuts a stake in the insertion portion, are provided on a sandwiching surface 91 of the movable sandwiching member 71. The tip surface of the convex portion 81 has a square shape to prevent the clamp from being displaced with respect to the existing pile regardless of the rotation angle of the movable holding member 71.
[0004]
[Problems to be solved by the invention]
By the way, when the above-mentioned pile press-in device actually presses a new pile into the ground, a force is applied upward from the ground to the pile to be press-fitted. , An external force is applied to the clamp to tilt the clamp toward the rear end of the apparatus body.
However, in the pile press-fitting device in which the fixed and movable clamping members of the clamp are provided with the projections 80 and 81, respectively, since the left and right edges are short, when the pile is pressed in, the external force is applied to the existing pile. On the other hand, as a result of the displacement of the clamp in the left-right direction of the convex portion and the change in the attitude of the apparatus main body, there has been a case where the construction accuracy is reduced. Therefore, in order to press-fit a pile with high precision, skilled skills of an operator were required.
[0005]
An object of the present invention is to provide a pile press-in device that can easily press a pile into the ground with high accuracy by sandwiching the pile so as not to shift with respect to an existing pile.
[0006]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the invention according to claim 1 includes, for example, as shown in FIGS. 1 to 5, a pile narrow portion (for example, a clamp 20) that sandwiches an existing pile P, and this pile sandwich portion 20. In a pile press-in device 1 having a pile press-in portion 10 that presses a new pile P into the ground G by taking a reaction force from the existing pile P to be sandwiched,
The pile sandwiching portion 20 includes two surfaces (for example, sandwiching surfaces 25 and 26) that are arranged to face each other and sandwich the existing pile P interposed therebetween.
At least one of the surfaces 25 and 26 is provided with a plurality of convex portions 30 and 31 whose tip surfaces abut the existing pile P,
The tip surface is shaped to have a vertical width longer than a horizontal width.
[0007]
According to the first aspect of the present invention, the pile sandwiching portion is configured such that the tip surfaces of the plurality of protrusions provided on at least one of the two surfaces are in contact with the existing pile. Since the tip end surface has a shape in which the vertical width is longer than the left and right width, the pile press-fitting part presses a new pile into the ground, so that the pile clipping part is connected to the side of the pile press-fitting part. When an external force such as tilting to the opposite side is applied, the pile sandwiching part can be prevented from being shifted in the left-right direction of the convex part with respect to the existing pile by the left and right edges of the plural convex parts, It is possible to prevent the pile sandwiching portion from being shifted in the vertical direction with respect to the existing pile by the upper and lower edges of the plurality of projections. As described above, since the plurality of protrusions make it difficult for the pile pinch portion to be displaced from the existing pile during the press-fitting of the pile, unlike the case of press-fitting the pile using the conventional pile press-in device, the press-fitting of the pile is not performed. In this case, a skilled technique is not required to maintain the posture of the pile press-in device, and the pile can be easily pressed into the ground with high accuracy.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of a pile press-in device according to the present invention will be described in detail with reference to the drawings. In the present embodiment, the pile press-in device is described as a device in which a substantially U-shaped steel sheet pile (hereinafter, referred to as a pile) is pressed into the ground. The pile has a substantially U-shape formed by a flat web and two flanges bent from both sides in the width direction of the web, and the open sides thereof are alternately arranged in opposite directions to be adjacent to each other. And multiple press-fits into the ground. In addition, the pile has, at each end of the two flanges, a first piece protruding from the end of the flange toward the opposite side of the web in parallel with the width direction of the web, and a tip of the web from the tip of the first piece. An L-shaped section comprising a first piece and a second piece projecting vertically toward the side is provided, and can be connected to another pile via this section.
[0009]
As shown in FIG. 1, the pile press-fitting device 1 according to the present invention includes a device main body 40, four pile narrow portions each sandwiching the existing pile P from the side, that is, clamps 20,. , And a pile press-in portion 10 for taking the reaction force from the existing piles P and pressing the piles P into the ground G.
[0010]
The device body 40 includes a saddle 41 provided at a lower end portion of the device body 40, a slide base provided on the upper portion of the saddle 41 so as to be slidable with respect to the saddle 41 in the arrangement direction of the piles, and provided on the slide base. Column-shaped mast 43 and the like. The mast 43 is rotatable within a predetermined range by a hydraulic motor (not shown) or the like, so that the connection direction of the pile P can be changed.
[0011]
The pile press-fitting portion 10 includes an elevating body 11 provided at the front end of the mast 43, that is, an end of the mast 43 in a direction in which a new pile P is to be press-fitted (hereinafter, referred to as a front), and an elevating body 11 And a substantially cylindrical chuck 13 protruding forward from the lower end of the FPC and opening vertically.
The elevating body 11 has a columnar shape extending vertically, and a main cylinder 12 for elevating the elevating body 11 is provided on a side surface thereof.
The chuck 13 has an insertion portion (not shown) into which a new pile P to be pressed into the ground G is to be inserted, and a web of the pile P is placed on both side walls forming the insertion portion from both sides. It is provided with a sandwiching portion (not shown) for narrowing. The chuck 13 is rotatable by 180 degrees perpendicular to the center axis.
[0012]
The clamp 20 hangs from the saddle 41 and is provided so as to be horizontally movable in a direction perpendicular to the row of piles, and is in a state of sandwiching the existing pile P. As shown in FIG. 2, the clamp 20 has a side wall 21 formed in a forked shape, facing each other, and having an insertion portion 24 between which the existing pile P is inserted. Members for sandwiching the web of the existing pile P in the insertion portion 24 from both sides are provided on both side wall surfaces of the side wall portion opposing each other. That is, one of the side wall surfaces 210 is provided with a fixed pinching member 220 fixed to the side wall surface 210, and the other side wall surface 211 is moved toward the fixed pinching member 220 so that the inside of the insertion portion 24 is moved. Two circular movable holding members 221 and 221 capable of pressing the existing pile P against the fixed holding member 220 are provided. The fixed sandwiching member 220 and the movable sandwiching member 221 are provided with sandwiching surfaces 25 and 26 which face each other and sandwich an existing pile P interposed therebetween.
[0013]
The movable sandwiching member 221 is provided to be able to move forward and backward from the other side wall surface 211 to the one side wall surface 210 via the cylinder 23. The cylinder 23 is provided in a hole 213 formed in the other side wall surface 211, and a distal end portion is fixed to a bottom surface of the hole portion 213, and a base end portion extends toward the one side wall surface 210. And a cylinder body 28 that is reciprocally movable along the rod 27 and slidably provided on the inner peripheral surface of the hole 213. A movable sandwiching member 221 is fixed to a portion of the cylinder body 28 on one side wall surface 210 side. Further, key grooves (not shown) that engage with each other are formed on the outer peripheral surface of the cylinder main body 28 and the inner peripheral surface of the hole 213 along the sliding direction of the cylinder main body 28. . Therefore, the cylinder body 28 is in a state where its rotation in a plane parallel to the other side wall surface 211 is restricted, and as a result, the movable sandwiching member 221 supported by the cylinder body 28 The rotation in a plane parallel to the axis is restricted.
[0014]
As shown in FIGS. 2 and 3, the sandwiching surface 26 of the movable sandwiching member 221 whose rotation is restricted with respect to the other side wall surface 211 has a rectangular tip surface whose vertical width is longer than the horizontal width. A plurality of convex portions 31,... Abutting on the web of the pile P in the insertion portion 24 are provided on the distal end surface. .. And the sandwiching surface 26 are formed by shaving the surface of the movable sandwiching member 221 and providing a plurality of grooves on the surface.
In addition, the sandwiching surface 25 of the fixed sandwiching member 220 fixed to the one side wall surface 210 has a rectangular tip end surface whose vertical width is longer than the left and right widths. A plurality of projections 30,... Abutting on the web at P are provided. The plurality of convex portions 30,... And the sandwiching surface 25 are formed by shaving the surface of the fixed sandwiching member 220 and providing a plurality of grooves on the surface.
[0015]
As described above, the clamp 20 provided with the plurality of protrusions 30 and 31 on the holding surfaces 25 and 26 prevents the existing pile P from being shifted while being sandwiched by the upper and lower and left and right edges of the plurality of protrusions 30 and 31. It is prevented and is fixed to the existing pile P.
In addition, it is preferable that the upper and lower widths of these convex portions 30 and 31 are 1.2 times or more and 4 times or less with respect to the right and left widths. Has doubled.
[0016]
Next, a method of press-fitting the pile P into the ground G by the above-described pile press-fitting device 1 will be described.
First, a plurality of existing piles P,... Are sandwiched by a plurality of clamps 20,.
Next, a pile P to be newly press-fitted (hereinafter, referred to as a pile Pm for the sake of convenience to distinguish it from the existing pile P) is sandwiched by the chuck 13 with the pile press-fitting portion 10 raised. Then, the pile Pm is pressed down into the ground G by lowering the pile press-fitting section 10 in a state where the piles P,.
[0017]
After the pile Pm is completely pressed, the sandwiched state of the pile Pm by the chuck 13 is released, the pile press-fitting portion 10 is raised, and the slide base is slid forward by one pile. Then, the chuck 13 is rotated by 180 degrees perpendicular to the center axis thereof, and a new pile P sandwiched between the chucks 13 (hereinafter referred to as a pile Pn for the sake of convenience to be distinguished from the existing pile P and the pile Pm). And press-fit into the ground G adjacent to the press-fitted pile Pm. When the pile Pn is press-fitted halfway, the press-fit is temporarily stopped, and the clamp 13 releases the pinched state of the piles P,. Are moved above the piles Pm, P,. Next, in this state, the saddle 41 is slid forward by one pile, and the clamps 20,... Are respectively moved horizontally to be positioned above the webs of the piles Pm, P,. , ... is lowered. Then, the pile press-in device 1 is fixed on the existing piles Pm, P,... By the clamps 20,..., And the pile press-in section 10 is lowered to completely press the pile Pn into the ground G.
Then, the pile P is continuously pressed into the ground G by repeating the above steps.
[0018]
According to the pile press-in device 1 as described above, the press-in force when the pile P is pressed into the ground G and the clamp pile pull-out resistance, which is the resistance to the removal of the pile P from the ground G, are shown in FIG. The relationship is as shown in FIG.
In FIG. 4, the vertical axis indicates the press-in force (kN), and the horizontal axis indicates the clamp pile pull-out resistance (kN), that is, the reaction force when the pile is press-fitted. Note that, as indicated by a dashed line in the drawing, it is ideal that the clamp pile pull-out resistance and the press-in force have a proportional relationship regardless of the magnitude of the press-in force. Further, the conventional pile press-fitting device is a pile press-fitting device in which the clamp fixing and movable clamping members include a plurality of convex portions 80,... And convex portions 81,.
In the conventional pile press-in device and the pile press-in device 1 of the present embodiment, while the press-in force is small, the press-in force and the clamp pile pull-out resistance have a proportional relationship. Then, when the press-in force reaches a certain size, the clamp 20 shifts with respect to the pile P, so that the amount of increase in the press-in force with respect to the clamp pile pull-out resistance is small. In the pile press-in device 1, the maximum press-in value in a state where the clamp pile pull-out resistance and the press-in force are in a proportional relationship is approximately 392 kN (ｋ40000 kgf). Is about 98 kN (≒ 10000 kgf).
[0019]
From this figure, in the pile press-in device 1, the clamp pile pull-out resistance and the press-in force are proportional to the press-in force up to a large press-in value as compared with the conventional pile press-in device, and the clamp 20 is shifted with respect to the pile P. It has been shown to be difficult. That is, the clamp 20 in the pile press-fitting device 1 is different from the clamp in the conventional pile press-fitting device in that, when an external force that causes the clamp 20 to tilt backward is applied to the clamp 20 by press-fitting the pile P, a plurality of clamps are provided. The upper and lower edges and the left and right edges of the projections 30 and 31 prevent the existing pile P from being displaced more reliably, and are in a state of being firmly fixed to the pile P. Therefore, unlike the case where the pile is press-fitted by using the conventional pile press-fitting device, a skilled technique is not required for maintaining the posture of the pile press-fitting device 1 when the pile P is press-fitted, and it is easy and highly accurate. The pile P can be pressed into the ground G.
[0020]
In addition, the magnitude of the press-in force at which the clamp 20 is displaced with respect to the pile P is larger in the pile press-in device 1 in a state where the pile-pull-out device 1 and the conventional pile press-in device have the same pile pull-out resistance. It is about 20% larger than the conventional pile press-in device. That is, the pile press-in device 1 can press the pile into the ground G with a larger press-in force than the conventional pile press-in device.
[0021]
Furthermore, since the pile press-fitting device 1 is firmly fixed to the existing pile P by the plurality of protrusions 30 and 31 of the clamp 20, the cylinder for moving the movable clamping member 221 to increase the clamping force of the pile P by the clamp 20. As compared with the case where 23 is made large, the weight of the pile press-in device 1 can be reduced and the pile press-in device 1 can be formed at low cost.
[0022]
In the above embodiment, the pile press-fitting device 1 has been described as a device for press-fitting the pile P into the ground G. However, the existing pile P in the ground is removed by a procedure reverse to the procedure described in the above embodiment. It is good also as what is pulled out.
In addition, although the plurality of rectangular protrusions 30 whose vertical width is longer than the horizontal width are described as being provided on both the holding surfaces 25 and 26 of the fixed holding member 220 and the movable holding member 221, such a case is described. The convex portion 30 having a shape may be provided only on one of the sandwiching surfaces 25 and 26. Further, the sandwiching surfaces 25 and 26 are not limited to the protrusions 30 and 31 and may be provided with a plurality of protrusions having other shapes. For example, as shown in FIG. 5A, a plurality of convex portions 32,... Having a square shape in a front view are provided at portions separated from the upper and lower ends of the sandwiching surface 25, and the left and right widths are provided at the upper and lower ends of the sandwiching surface 25. It is also possible to provide a plurality of rectangular projections 30,... Further, as shown in FIG. 5B, a plurality of convex portions 30 are provided in a portion separated from the upper and lower ends of the sandwiching surface 25 in a state extending in the vertical direction. The protrusions 30 may be provided in a plurality extending in the radial direction with the center of the sandwiching surface 25 as the center. Further, a plurality of convex portions extending in a direction orthogonal to an external force applied to the clamp 20 when the pile press-fitting portion 10 press-fits the pile P are sandwiched together with a plurality of convex portions 30 having a vertical width longer than the left and right widths. 25 may be provided.
[0023]
Further, the clamp 20 has been described as including the fixed narrowing member 220 and the movable sandwiching member 221, but the clamp 20 may include the two movable sandwiching members 221 and 221 without including the fixed narrowing member 220.
Furthermore, although the pile press-in device 1 has been described as pressing a U-shaped steel sheet pile into the ground G as the pile P, the present invention is not limited thereto, and an H-shaped steel sheet pile may be pressed into the ground G. .
[0024]
【The invention's effect】
According to the first aspect of the present invention, since the pile pinching portion is unlikely to be displaced with respect to the existing pile, a skilled technique is not required to maintain the posture of the pile press-fitting device at the time of press-fitting the pile. The pile can be easily pressed into the ground with high accuracy.
[Brief description of the drawings]
FIG. 1 is a side view showing a pile press-fitting device according to the present invention.
FIG. 2 is a longitudinal sectional view of a clamp and an existing pile.
3A is a diagram illustrating a convex portion provided on a fixed sandwiching member, and FIG. 3B is a diagram illustrating a convex portion provided on a movable sandwiching member.
FIG. 4 is a diagram showing the relationship between the press-fitting force of the pile and the pull-out resistance of the clamp pile when the pile press-fitting device according to the present invention presses the pile into the ground.
FIG. 5 is a view showing a convex portion provided in a fixed sandwiching member according to a modification of the present invention.
6A is a diagram showing a convex portion provided in a fixed pinching member in a conventional pile press-in device, and FIG. 6B is a diagram showing a convex portion provided in a movable pinching member in a conventional pile press-in device. is there.
[Explanation of symbols]
1 Pile press-in device 10 Pile press-in part 20 Clamp (pile pinch part)
25, 26 sandwiching surface (opposing surface)
30,31 Plurality of convex parts P Piles G Ground

Claims (1)

In a pile press-fitting device including a pile narrow portion that sandwiches an existing pile, and a pile press-in portion that presses a new pile into the ground by taking a reaction force from the existing pile sandwiched by the pile clip portion,
The pile sandwiching portion includes two surfaces sandwiching the existing pile interposed therebetween and interposed therebetween,
Of these surfaces, at least one surface is provided with a plurality of protrusions whose tip surfaces abut the existing pile,
A pile press-fitting device, wherein the tip surface has a shape in which a vertical width is longer than a horizontal width.

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