JP2015048583A - Pile fixation method, pile fixation device, and pile press-in method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To precisely press in a pile by efficiently and readily fixing the pile in the foundation.SOLUTION: In a gap 103 between the foundation 100 and a pile 101 installed in the foundation, a plate spring 10 generating elastic force in a direction of expanding the gap is installed and fixed. Additionally, two plates 31, 32 inserted in the gap are relatively slid on respective tapered faces so as to be expanded in the width direction, and are then fixed (Fig. 5). The fixed pile is grabbed as a reaction pile by a pile press-in machine, which in turn presses in another pile.

Description

  The present invention relates to a pile fixing method and a pile fixing device for fixing a pile to the ground, and a pile press-in method for fixing a reaction force pile to the ground.

2. Description of the Related Art Conventionally, a pile press-in machine that takes a reaction force from an existing pile and press-fits the pile into the ground is known as an apparatus for driving a pile into the ground and burying it (see, for example, Patent Documents 1-3).
The pile presser obtains the reaction force during press-fitting of a new pile by grasping the pile that has already been laid. The placed pile has resistance to pulling out due to peripheral friction with the ground and its own weight. At least the pulling resistance of the existing pile and the weight of the pile presser can be obtained as the reaction force when the new pile is press-fitted, and can be supplemented with a weight.
In addition, as shown in FIG. 12, the pile 101 is placed on the hard ground 100 such as a bedrock by cutting the ground with a cutter 102 attached to the tip of the pile. Therefore, the cutter 102 is cut between the ground 100 and the pile 101. A gap 103 is generated.

JP 2003-213684 A Japanese Patent Laid-Open No. 10-195872 JP-A-11-350482

However, the prior art has the following problems, which are particularly noticeable when placing piles on hard ground.
For one thing, the harder the ground to press-fit the pile, the more weight is needed to compensate for the reaction force at the time of the pile press-in, and it takes time and labor to install that weight every time one pile is press-fitted. There is a problem that work efficiency decreases.
In addition, as described above, if a cutter attached to the tip of the pile is used for placing the pile on the hard ground, a gap 103 is formed by cutting the cutter, so the pile placed is not stable, and FIG. As indicated by the arrows, there is a problem that when the pile is pressed into the reaction force pile, a moment is generated in addition to the pulling force, and the reaction force pile itself swings in the front / rear and left / right directions and becomes unstable, leading to a decrease in the accuracy of the press fitting of the pile. .

  The present invention has been made in view of the above problems in the prior art, and is a pile fixing method and a pile fixing device capable of fixing a pile to the ground efficiently and easily, and a pile fixed to the ground efficiently and easily. It is an object of the present invention to provide a pile press-in method that can be efficiently and accurately performed.

  The invention according to claim 1 for solving the above-described problem is provided with a biasing member that biases the ground in a direction perpendicular to the axis of the pile in a gap between the ground and a pile placed on the ground. It is a pile fixing method characterized by fixing the pile to the ground by installing at least one or more.

  The invention according to claim 2 is the pile fixing method according to claim 1, wherein the biasing member is a leaf spring bent around an axis along the longitudinal direction.

  According to a third aspect of the present invention, the leaf spring is press-fitted into the gap while elastically deforming the leaf spring so that the longitudinal direction of the leaf spring is along the axial direction of the pile. The pile fixing method according to claim 2, wherein the pile is installed in the gap.

  The invention according to claim 4 is characterized in that the leaf spring has a plurality of supporting points in contact with the ground and a plurality of supporting points in contact with the ground within a plane orthogonal to the axial direction of the pile. The pile fixing method according to any one of claims 2 to 3.

According to a fifth aspect of the present invention, as the urging member, two plates formed with tapered portions having a reduced thickness are formed so that the directions in which the thicknesses of both the tapered portions are reduced are opposite to each other. Insert so that the direction is perpendicular to the axis of the pile,
The pile fixing according to claim 1, wherein the pile is fixed to the ground by relatively sliding the two plates on the taper surfaces of the tapered portion and expanding in the thickness direction. Is the method.

The invention according to claim 6 is the first plate in which the tapered portion of the aspect in which the thickness is reduced,
A second plate formed with a tapered portion of a mode of decreasing thickness;
With a telescopic cylinder,
In the first plate and the second plate, the direction in which the thickness of the tapered portion of the first plate decreases and the direction in which the thickness of the tapered portion of the second plate decreases are opposite to each other. Connected by the cylinder,
The first plate and the second plate are configured so that the taper portion of the first plate and the taper portion of the second plate slide relative to each other on the taper surface due to expansion and contraction of the cylinder. Has the function of expanding and contracting in the direction of thickness,
In the gap between the pile to be fixed and the ground on which it is placed, the portion of the first plate and the second plate that expands / shrinks by at least the function, the direction of the thickness is the axis of the pile The pile fixing device is configured to be insertable so as to be orthogonal to each other.

  According to a seventh aspect of the present invention, the first plate and the second plate are formed long in the expansion / contraction direction of the cylinder, and ends in the same direction in the longitudinal direction are connected to each other via the cylinder. The pile fixing device according to claim 6, wherein an end portion is configured to be inserted into the gap.

  The invention according to claim 8 captures the reaction force during press-fitting by causing the pile presser to grip the upper end of the existing pile fixed by the pile fixing method according to any one of claims 1 to 5. It is a pile press-in method in which a pile is press-fit with the pile press-in machine.

  Invention of Claim 9 makes the reaction force at the time of press-fitting take the reaction force at the time of press-fitting by making the pile presser grasp the upper end part of the existing pile fixed using the pile fixing device of Claim 6 or Claim 7 This is a pile press-in method in which a pile is press-fitted by a pile press-in machine.

According to the pile fixing method or the pile fixing device of the present invention, the ground and the pile are urged by a biasing member such as a plate spring or two plates installed in the gap between the ground and the pile placed on the ground. The pile can be stabilized and fixed by pressing and the pulling resistance of the pile can be increased. The leaf spring has a taper part due to its elastic deformation, and the two plates can be easily attached to and removed from the gap by expansion and contraction in the thickness direction due to sliding of the taper part. The pile can be fixed to
According to the pile press-in method of the present invention, since the above-described pile fixing method or pile fixing device of the present invention is used, the stability of the reaction force pile and the pull-out resistance force are increased, and thus the posture of the pile press-in machine is stable. Therefore, it is not necessary to use a weight that compensates the reaction force at the time of pile press-in with the prior art, and the pile can be press-fitted efficiently and accurately by fixing the pile to the ground efficiently and easily.

It is a vertical sectional view of the ground and an existing pile for explaining the pile adhering method according to the first embodiment of the present invention. It is a horizontal sectional view of the ground for explaining the pile adhering method concerning a 1st embodiment of the present invention, and an existing pile, and shows the case where a leaf spring is installed in two places. It is a horizontal sectional view of the ground and an existing pile for explaining the pile adhering method concerning a 1st embodiment of the present invention, and shows the case where a leaf spring is installed in three places. It is a partial horizontal sectional view of the ground and an existing pile for explaining the pile adhering method according to the first embodiment of the present invention, and shows different forms of leaf springs. It is a vertical sectional view of the ground and an existing pile for explaining a pile fixing method according to a second embodiment of the present invention. It is a perspective view of the 1st plate which constitutes the pile adhering device concerning a 2nd embodiment of the present invention. It is a perspective view of the 2nd plate and cylinder which constitute the pile adhering device concerning a 2nd embodiment of the present invention. It is a perspective view of the pile fixing device which concerns on 2nd Embodiment of this invention. It is a horizontal sectional view of the ground and an existing pile for explaining a pile fixing method according to a second embodiment of the present invention, and shows a case where pile fixing devices are installed at two locations. It is a horizontal sectional view of the ground and an existing pile for explaining a pile adhering method concerning a 2nd embodiment of the present invention, and shows a case where a pile adhering device is installed in three places. It is a schematic diagram which shows a mode that it sticks to a reaction force pile and constructs pile press-fit with a pile press-in machine according to the embodiment of the present invention. It is a vertical sectional view showing a conventional example of a ground and a pile placed on the ground.

  An embodiment of the present invention will be described below with reference to the drawings. The following is one embodiment of the present invention and does not limit the present invention.

[First Embodiment]
First, a pile fixing method using a leaf spring will be described as a first embodiment with reference to FIGS. 1 to 4.
The leaf spring 10 shown in FIGS. 1, 2 and 3 or the leaf spring 20 shown in FIG. 4 is used. The pile 101 placed on the ground 100 is fixed to the ground 100 using the leaf spring 10 (20). As the ground 100, a hard ground such as a rock is assumed. The pile 101 is a steel pipe pile having a cutter 102 at the tip. It is constructed while cutting the hard ground 100 with the cutter 102 as the pile 101 rotates about the axis.

The plate spring 10 and the plate spring 20 are formed by bending a long steel plate around an axis along the longitudinal direction. The leaf spring 10 has a single folded portion 12. The leaf spring 20 has two folds 22a and 22b. The bending direction of the folding part 22a and the folding part 22b is the same direction.
As a pile fixing method, as shown in FIGS. 1 to 4, a plate in which an elastic force in the direction of expanding the gap 103 is generated in the gap 103 between the ground 100 and the pile 101 placed on the ground 100. This is done by installing the spring 10 (20). By pressing the leaf spring 10 (20) into the gap 103 while elastically deforming the leaf spring 10 (20) so that the longitudinal direction of the leaf spring 10 (20) is along the axial direction of the pile 101, the elastic force It can be installed in a state that causes Accordingly, a pressing force F is generated from the leaf spring 10 (20) to the ground 100 and the pile 101, that is, the leaf spring 10 (20) presses the ground 100 and the pile 101. Therefore, the pile 101 can be stabilized and fixed to the ground 100, and the pulling resistance force of the pile 101 can be increased.

It is preferable to install the leaf springs 10 (20) at a plurality of locations with respect to one pile 101 so that the axis of the pile 101 does not shift. For example, as shown in FIGS. 1 and 2, two leaf springs 10 (20) are used and installed at positions facing each other across the pile 101. Even when three or more leaf springs 10 (20) are used, they are equally distributed as shown in FIG.
Since the pile 101 is tubular, there is a gap on the inner side, but the leaf spring 10 (20) is installed in the outer gap 103. The leaf spring 10 (20) is installed with its upper end protruding on the ground 100 as shown in FIG.

2 and 3, when the leaf spring 10 is used, the mountain fold side of the fold 12 is pressed against the ground 100, the valley fold side is set toward the pile 101, and both end portions in the width direction are provided. 11 a and 11 b are pressed against the outer peripheral surface of the pile 101. A pressing force F is applied to the ground 100 from the folding portion 12 and a pressing force F is applied to the pile 101 from each of the side end portions 11a and 11b.
When the leaf spring 20 is used, as shown in FIG. 4, the mountain fold side of the fold portions 22a and 22b is pressed against the ground 100, the valley fold side is set toward the pile 101 side, and both end portions 21a in the width direction are installed. , 21 b is pressed against the outer peripheral surface of the pile 101. A pressing force F is applied to the ground 100 from each of the folding portions 22a and 22b, and a pressing force F is applied to the pile 101 from each of the side end portions 21a and 21b.
In order to easily obtain the stability of the pile 101 without increasing the number of leaf springs installed, the leaf spring is in a plane (FIG. 4) orthogonal to the axial direction of the pile 101, like the leaf spring 20 of FIG. It is preferable that the fulcrum in contact with the ground 100 is provided at a plurality of locations (folded portions 22a and 22b) and the fulcrum in contact with the pile 101 is provided at a plurality of locations (both side end portions 21a and 21b).

In addition to the leaf springs 10 and 20, which have a folded portion where a ridgeline appears, those bent into a curved surface may be applied.
In addition, since the gap 103 itself is curved, it is possible to install it in a state where an elastic force is generated in the direction in which the gap 103 is widened even if the plate spring to be applied is planar. Also good.

[Second Embodiment]
Next, a pile fixing method and a pile fixing device using two plates with tapered portions formed as a second embodiment will be described with reference to FIGS.
About the ground 100, the pile 101, the cutter 102, and the clearance gap 103, the same code | symbol is assumed supposing the same thing of 1st Embodiment.

As shown in the right half of FIG. 5, the main point of the pile fixing method is that two plates 31 and 32 are inserted into the gap 103 so that the thickness direction is the gap direction of the gap 103. As shown in the left half, the two plates 31 and 32 are relatively slid on the taper surfaces of each other and expanded in the thickness direction to generate a pressing force F, thereby fixing the pile 101 to the ground 100. Is. In the present embodiment, the radial direction of the pile 101 coincides with the interval direction of the gap 103.
In order to implement this pile fixing method, a pile fixing device 30 having an expansion / contraction function in the thickness direction of the two plates 31 and 32 is used.

The pile fixing device 30 will be described with reference to FIGS.
The pile fixing device 30 includes a first plate 31, a second plate 32, and a cylinder 33 that expands and contracts.
As shown in FIG. 6, the first plate 31 has a male shape in which the main body is formed of a long steel plate, a tapered portion 31b is formed at the lower end portion of the long plate portion 31a, and the upper end portion 31c is The long plate portion 31a is bent at approximately 90 degrees and is continuous, and a cylinder connecting bearing portion 31d is fixed to the lower surface of the upper end portion 31c.
The tapered portion 31b has a thickness that decreases toward the lower end, and the tapered surface 31b1 is formed on the back side in FIG. 6, that is, the surface opposite to the side on which the upper end portion 31c extends.
The long plate portion 31a is curved so that the side on which the tapered surface 31b1 is provided is concave according to the curvature of the outer peripheral surface of the pile 101.

As shown in FIG. 7, the second plate 32 has a female shape in which the main body is formed of a long steel plate, a tapered portion 32 b is formed on the long plate portion 32 a, and the upper end portion 32 c is a long plate portion. The lower end of the cylinder 33 is fixed to the upper surface of the upper end portion 32c. The second plate 32 is formed with a hole portion 32d into which the long plate portion 31a of the first plate 31 is inserted. The hole 32d extends along the longitudinal direction of the long plate portion 32a to the long plate portion 32a. The hole 32d is formed from a position higher than the lowermost end of the long plate portion 32a to the upper end of the long plate portion 32a so as to leave the lower end portion of the long plate portion 32a, and further on the side connected to the long plate portion 32a of the upper end portion 32c. It is formed by cutting out a part.
The tapered portion 32b is formed on the lower end side of the hole portion 32d. The tapered portion 32b has a reciprocal relationship with the tapered portion 32b of the first plate 31, that is, a mode in which the thickness decreases toward the upper end so that the directions in which the thickness decreases are opposite to each other, and the tapered surface 32b1 Is formed on the front side in FIG. 7, that is, on the surface on which the upper end 32c extends.
The long plate portion 32a is curved so that the side on which the tapered surface 32b1 is provided is convex according to the curvature of the outer peripheral surface of the pile 101.

  As shown in FIG. 8, the pile fixing device 30 is configured by combining the first plate 31, the second plate 32, and the cylinder 33. That is, the long plate portion 31a of the first plate 31 is inserted into the hole portion 32d (see FIG. 7) of the second plate 32, and the upper end portion 33a of the cylinder 33 is connected to the bearing portion 31d in the form of a shaft coupling. Is done. As shown in FIG. 8, the tapered surface 31b1 of the first plate 31 and the tapered surface 32b1 of the second plate 32 face each other, the bending direction of the long plate portion 31a and the bending direction of the long plate portion 32a coincide, The extending direction of the portion 31c and the extending direction of the upper end portion 32c are assembled.

As shown in FIG. 5, a plurality of pile fixing devices 30 described above are used to fix the pile 101 to the ground 100. The procedure of the fixing method will be described below.
First, as shown in the right half of FIG. 5, the cylinder 33 is extended by a predetermined amount, and the maximum dimension in the thickness direction in which the long plate portion 31a of the first plate 31 and the long plate portion 32a of the second plate 32 exist. In this state, the long plate portion 31 a and the long plate portion 32 a are inserted into the gap 103. In this insertion, the cylinder 33 is placed outside the pile 101 and the concave portions of the long plate portion 31a and the long plate portion 32a are arranged toward the outer peripheral surface of the pile 101, and the thickness direction of the long plate portions 31a and 32a (and therefore taper). The thickness direction of the portions 31b and 32b) is the interval direction of the gap 103. As shown in FIG. 5, the tapered portions 31 b and 32 b are also inserted into the gap 103. The cylinder 33 is installed on the ground 100.

Next, the cylinder 33 is contracted and the two plates 31 and 32 are moved relative to each other in the axial direction of the pile 101, whereby the first plate 31 and the second plate 32 are mutually tapered surfaces 31b1 and 32b1. And is expanded in the thickness direction as shown in the left half of FIG. As a result, as shown in the figure, the lower end portion of the long plate portion 31a and the lower end portion of the long plate portion 32a are deformed so as to be separated from each other. The lower end portion of the long plate portion 31a extends radially outward with respect to the pile 101 to apply a pressing force F to the ground 100, and the lower end portion of the long plate portion 32a extends radially inward with respect to the pile 101 to A pressing force F is applied to the outer peripheral surface.
In this way, the long plate portions 31 a and 32 a of the pile fixing device 30 are opened, and a pressing force F is generated from the long plate portions 31 a and 32 a to the ground 100 and the pile 101. That is, the long plate portions 31 a and 32 a press the ground 100 and the pile 101. Therefore, the pile 101 can be stabilized and fixed to the ground 100, and the pulling resistance force of the pile 101 can be increased.

  Thereafter, the cylinder 33 is extended by a predetermined amount so that the maximum dimension in the thickness direction in which the long plate part 31 a of the first plate 31 and the long plate part 32 a of the second plate 32 exist becomes smaller than the gap dimension of the gap 103. Thus, the long plate portions 31 a and 32 a of the pile fixing device 30 can be easily pulled out from the gap 103.

It is possible to install pile fixing devices 30 having a pair of two plates 31 and 32 in which the tapered surfaces 31 b 1 and 32 b 1 are aligned with each other with respect to one pile 101 so that the axis of the pile 101 does not shift. preferable. For example, when installing in two places, as shown in FIG.5 and FIG.9, it is preferable to install in the position which opposes on both sides of the pile 101 using two pile fixing devices 30. FIG. . Even when three or more pile fixing devices 30 are used, it is preferable to install them evenly as shown in FIG.
Since the pile 101 is tubular, there is a gap on the inner side, but it is preferable to insert the long plate portions 31a and 32a of the pile fixing device 30 into the outer gap 103 for ease of installation.

[Construction using a pile presser]
As shown in FIG. 11, the pile press-fitting / pulling-out machine 50 holds the upper ends of the piles 101a to 101c fixed according to the first embodiment or the second embodiment, and the reaction force at the press-fitting of a new pile 101m is obtained. The pile 101m is press-fitted by the pile press-fitting and drawing machine 50. The pile press-fitting and pulling machine 50 grips the pile 101m and applies axial pressure input, and rotates or swings around the axis to cut the ground 100 with the cutter 102 at the tip of the press-fit direction to advance the press-in of the pile 101m. Let Although FIG. 11 illustrates an example in which the pile fixing device 30 is applied, the leaf spring of the first embodiment may be applied instead.

  The existing piles 101a to 101d are arranged in a row in the order of the pile 101a, the pile 101b, the pile 101c, and the pile 101d from the side closer to the newly pressed pile 101m. The pile press-fitting and drawing machine 50 shown in the figure can grasp the three piles 101a to 101c at the same time. By fixing any one of the piles 101a to 101c gripped by the pile press-fitting and drawing machine 50, it is possible to increase the reaction force when the pile 101m is press-fitted and to stabilize the posture of the pile press-fitting and drawing machine 50. All of the piles gripped by the pile press-fitting and drawing machine 50 may be fixed. The reaction force increases as the number of piles to be fixed among the piles gripped by the pile press-fitting and pulling machine 50 increases. However, a large number of leaf springs or pile fixing devices are required, and the plate springs or pile fixing devices are fixed and released. Since the work of relocation is complicated, the number of piles to be fixed is selected in consideration of the necessary reaction force, cost, and workability. When the number of piles to be fixed is one, it is preferable to fix the pile 101a closest to the pile 101m to be newly press-fitted. This is because a greater pulling force is applied to a pile closer to the pile 101m to be press-fitted as indicated by an arrow in FIG.

  As described above, a large and simple reaction force when pressing a new pile and stability of the reaction force pile can be easily obtained by compact and simple fixing means such as two plates having a leaf spring and a tapered portion. . By stabilizing the posture of the reaction force pile, the posture of the pile press-fitting and pulling machine is stabilized, and the construction accuracy of the press-fit pile is increased.

  In addition, the form of a pile is not limited to tubular things, such as a steel pipe pile, and a thing provided with a cutter at the pile front-end | tip, and a press-fit method is not limited to the construction method with rotation of a pile. The present invention can be suitably applied to any construction method in which a gap exposed on the ground is generated between the pile and the ground, such as a construction method in which a pile is placed in a hole excavated in the ground. Further, the urging member is not limited to two plates formed with leaf springs or tapered portions, but is a member that can urge the gap between the pile and the ground, such as a wedge, a bagging mortar, and a packer. I just need it. That is, the urging member may be a member that can be installed in the gap between the pile and the ground and can be urged to widen the gap.

10, 20 Leaf spring 30 Pile fixing device 31 First plate 31b Tapered portion 31b1 Tapered surface 32 Second plate 32b Tapered portion 32b1 Tapered surface 32d Hole 33 Cylinder 50 Pile press-fitting puller 100 Ground 101 Pile 102 Cutter 103 Crevice

The invention according to claim 1 for solving the above-described problem is provided with a biasing member that biases the ground in a direction perpendicular to the axis of the pile in a gap between the ground and a pile placed on the ground. a pile secured way to securing the pile into the ground by placing at least one,
The urging member is a pile fixing method , wherein the urging member is a leaf spring bent around an axis along a longitudinal direction .

According to a second aspect of the present invention, the leaf spring is pressed into the gap while elastically deforming the leaf spring so that the longitudinal direction of the leaf spring is along the axial direction of the pile. The pile fixing method according to claim 1 , wherein the pile is installed in the gap.

The invention according to claim 3 is characterized in that the leaf spring has a plurality of fulcrums in contact with the ground in a plane perpendicular to the axial direction of the pile and a plurality of fulcrums in contact with the pile. A pile fixing method according to claim 1 or claim 2 .

In the invention according to claim 4 , at least one or more urging members for urging the ground in a direction perpendicular to the axis of the pile are installed in the gap between the ground and the pile placed on the ground. A pile fixing method for fixing the pile to the ground,
As the urging member, two plates formed with tapered portions having a reduced thickness are opposite to each other in the direction in which the thicknesses of both tapered portions are reduced, and the direction of the thickness is perpendicular to the axis of the pile. Insert it in the direction,
The two plates, a pile fixation how to characterized by securing said pile to said ground by expanding the thickness direction by sliding relatively in the tapered surface of another of said tapered portion.

The invention according to claim 5 is a first plate formed with a tapered portion having a mode of decreasing thickness;
A second plate formed with a tapered portion of a mode of decreasing thickness;
With a telescopic cylinder,
In the first plate and the second plate, the direction in which the thickness of the tapered portion of the first plate decreases and the direction in which the thickness of the tapered portion of the second plate decreases are opposite to each other. Connected by the cylinder,
The first plate and the second plate are configured so that the taper portion of the first plate and the taper portion of the second plate slide relative to each other on the taper surface due to expansion and contraction of the cylinder. Has the function of expanding and contracting in the direction of thickness,
In the gap between the pile to be fixed and the ground on which it is placed, the portion of the first plate and the second plate that expands / shrinks by at least the function, the direction of the thickness is the axis of the pile The pile fixing device is configured to be insertable so as to be orthogonal to each other.

According to a sixth aspect of the present invention, the first plate and the second plate are formed long in the expansion / contraction direction of the cylinder, and the ends in the same direction in the longitudinal direction are connected to each other via the cylinder. The pile fixing device according to claim 5 , wherein an end portion is configured to be insertable into the gap.

Invention of claim 7, take the reaction force of the press fitting by making gripped upper end of the existing pile which is fixed by the pile fixation method as claimed in any one of claims 4 to pile press-machine It is a pile press-in method in which a pile is press-fit with the pile press-in machine.

In the invention described in claim 8 , the pile pressing machine grips the upper end of the existing pile fixed by using the pile fixing device according to claim 5 or claim 6 so that the reaction force at the time of press-fitting is taken. This is a pile press-in method in which a pile is press-fitted by a pile press-in machine.

According to the pile fixing method or the pile fixing device of the present invention, the ground and the pile are urged by a biasing member such as a plate spring or two plates installed in the gap between the ground and the pile placed on the ground. The pile can be stabilized and fixed by pressing and the pulling resistance of the pile can be increased. The plate spring is elastically deformed, and the two plates with the tapered part can be easily attached and removed from the gap by expansion and contraction in the thickness direction due to the sliding of the tapered part. Pile can be fixed to the ground.
According to the pile press-in method of the present invention, since the above-described pile fixing method or pile fixing device of the present invention is used, the stability of the reaction force pile and the pull-out resistance force are increased, and thus the posture of the pile press-in machine is stable. Therefore, it is not necessary to use a weight that compensates the reaction force at the time of pile press-in with the prior art, and the pile can be press-fitted efficiently and accurately by fixing the pile to the ground efficiently and easily.

Claims (9)

  The pile is fixed to the ground by installing at least one urging member for urging the ground in a direction perpendicular to the axis of the pile in a gap between the ground and a pile placed on the ground. A pile fixing method characterized by that.   2. The pile fixing method according to claim 1, wherein the urging member is a leaf spring that is bent around an axis along a longitudinal direction.   The leaf spring is installed in the gap by pressing the leaf spring into the gap while elastically deforming the leaf spring so that the longitudinal direction of the leaf spring is along the axial direction of the pile. The pile fixing method according to claim 2, wherein the pile fixing method is characterized.   The said leaf | plate spring has the fulcrum which touches the said ground in multiple places within the plane orthogonal to the axial direction of the said pile, and has the fulcrum which touches the said pile in multiple places. The pile adhering method as described in any one of them. As the urging member, two plates formed with tapered portions having a reduced thickness are opposite to each other in the direction in which the thicknesses of both tapered portions are reduced, and the direction of the thickness is perpendicular to the axis of the pile. Insert it in the direction,
The pile fixing according to claim 1, wherein the pile is fixed to the ground by relatively sliding the two plates on the taper surfaces of the tapered portion and expanding in the thickness direction. Method. A first plate formed with a tapered portion of a mode of decreasing thickness;
A second plate formed with a tapered portion of a mode of decreasing thickness;
With a telescopic cylinder,
In the first plate and the second plate, the direction in which the thickness of the tapered portion of the first plate decreases and the direction in which the thickness of the tapered portion of the second plate decreases are opposite to each other. Connected by the cylinder,
The first plate and the second plate are configured so that the taper portion of the first plate and the taper portion of the second plate slide relative to each other on the taper surface due to expansion and contraction of the cylinder. Has the function of expanding and contracting in the direction of thickness,
In the gap between the pile to be fixed and the ground on which it is placed, the portion of the first plate and the second plate that expands / shrinks by at least the function, the direction of the thickness is the axis of the pile A pile fixing device configured to be insertable so as to be orthogonal to each other.   The first plate and the second plate are formed to be long in the expansion / contraction direction of the cylinder, end portions in the same direction in the longitudinal direction are connected to each other via the cylinder, and opposite end portions can be inserted into the gap. The pile fixing device according to claim 6, wherein the pile fixing device is configured as follows.   A pile presser is used to remove the reaction force at the time of press-fitting by gripping the upper end of the existing pile fixed by the pile fixing method according to any one of claims 1 to 5 to the pile presser. Pile press-in method to press-in.   A pile presser is used to grip the upper end of the existing pile fixed using the pile fixing device according to claim 6 or 7, and the pile presser is used to press the pile. Pile press-in method.

Images