JP2018096187A - Pile connection structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To connect a lower end of a rear pile 20 which is newly driven to an upper end of a pre pile 18 driven into the ground.SOLUTION: An L-shaped notch 24 is provided on a connection sleeve 22 fixed to an upper end of a pre pile 18. The L-shaped notch 24 is surrounded by a reinforcement band 34. A protrusion 36 is fixed to a lower end outer peripheral surface of a rear pile 20. A lower end of the rear pile 20 is fitted from the upper end of the connection sleeve 22 and is made to descend, and the protrusion 36 penetrates through a portion 28 parallel to a longitudinal direction of the pre pile 18 of the L-shaped notch 24. Then, the rear pile 20 is rotated in a rotation direction during an excavation operation by the pile or a direction opposite to the rotation direction, and thereby the protrusion 36 is moved to a portion 32 parallel to a circumferential direction of the pre pile 18 of the notch. Finally, a wedge 40 is driven and buried into a gap of the L-shaped notch 24. The connection sleeve 22 and the protrusion 36 are previously fixed to the piles, which makes a field work simple.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a connection structure for connecting the lower end of a pile driven in succession to the upper end of the pile driven into the ground.

  A steel pipe pile is driven into the ground to strengthen the ground of the building. In order to drive a steel pipe pile deeply, after driving a pile of a certain length, a new pile is connected to the upper end of the pile and driving is continued. At this time, the connection work for connecting the lower end of the pile to be driven is performed following the upper end of the pile that has already been driven. As a pile connection structure, a method using welding and a structure in which mechanical connection is made using a sleeve or a bolt and nut are known.

Japanese Patent No. 5616159 Japanese Patent No. 4878360

The known pile connection structure as described above has a problem to be solved. That is, the method using welding does not require connecting parts, but high skill and skill are required for the welding operation. On the other hand, in the method of connecting using a sleeve or a bolt and nut, the number of parts is large and the connection work becomes complicated. In either case, there is a problem that it takes a lot of time for the connection work in the field.
SUMMARY OF THE INVENTION An object of the present invention is to provide a pile connection structure that minimizes connection work on site, reduces the load on workers, and improves work efficiency.

  The following configurations are means for solving the above-described problems.

<Configuration 1>
It is a structure for connecting the lower end of the pile after being newly driven into the upper end of the tip pile driven into the ground,
The connection sleeve fixed to the upper end of the tip pile has a portion parallel to the longitudinal direction of the tip pile downward from its upper edge and parallel to the circumferential direction of the tip pile connected to the lower end of the parallel portion. An L-shaped notch with a portion is provided,
A reinforcing band wound around the outer peripheral surface of the connection sleeve so as to surround the L-shaped notch of the connection sleeve;
When the lower end of the rear pile is fitted and lowered from the upper end of the connection sleeve, it passes through a portion parallel to the longitudinal direction of the tip pile of the L-shaped notch, and the rear pile is excavated by the pile. A protrusion that moves to a portion parallel to the circumferential direction of the notch of the notch when it is rotated in the rotational direction during operation or in the opposite direction is fixed to the outer peripheral surface of the lower end of the rear pile, and this The protrusion has a shape that fits into a portion parallel to the circumferential direction of the tip of the notch,
A wedge for filling a portion parallel to the longitudinal direction of the tip pile of the L-shaped notch formed between the lower end of the rear pile fitted into the connection sleeve and the reinforcing band is provided. And pile connection structure.

<Configuration 2>
It is a structure for connecting the lower end of the pile after being newly driven into the upper end of the tip pile driven into the ground,
The connecting sleeve fixed to the lower end of the rear pile has a portion parallel to the longitudinal direction of the rear pile from the lower edge upward and parallel to the circumferential direction of the rear pile connected to the upper end of the parallel portion. An L-shaped notch with a portion is provided,
A reinforcing band wound around the outer peripheral surface of the connection sleeve so as to surround the L-shaped notch of the connection sleeve;
When the upper end of the front pile is fitted into the lower end of the connection sleeve and the rear pile is lowered, the L-shaped notch passes through a portion parallel to the longitudinal direction of the rear pile, and the rear When the pile is rotated in the direction of rotation during the excavation operation by the pile or in the opposite direction, a protrusion that moves to the part parallel to the circumferential direction of the pile after the above notch is fixed to the upper end outer peripheral surface of the tip pile. And the protrusion has a shape that fits into a part parallel to the circumferential direction of the pile after the cutout,
A wedge for filling a portion parallel to the longitudinal direction of the rear pile of the L-shaped notch formed between the upper end of the tip pile fitted into the connection sleeve and the reinforcing band; And pile connection structure.

<Configuration 3>
The pile connection structure according to Configuration 2, wherein the connection sleeve is fixed using a tube having the same outer shape as that of the rear pile.

<Configuration 4>
The pile connection structure according to Configuration 2, wherein the upper end of the connection sleeve is inserted inside the rear pile, and the upper end of the tip pile is fixed inside the connection sleeve.

<Configuration 5>
By the device that hangs the rear pile,
Fit the lower end of the rear pile to the upper end of the connection sleeve fixed to the front pile and lower the rear pile,
The protrusion fixed to the rear pile is passed through the part of the L-shaped notch parallel to the longitudinal direction of the pile,
Lower the rear pile as it is, stop the lower pile from descending by hitting the protrusion against the lower edge of the L-shaped notch,
A part parallel to the circumferential direction of the pile of the L-shaped notch by rotating the rear pile in the direction of rotation during the excavation operation by the pile or in the opposite direction by the device that rotates the rear pile for excavation by the pile Fit into
Then, the wedge connection method according to Configuration 1, wherein a wedge is driven into a gap generated in a portion parallel to the longitudinal direction of the L-shaped cutout pile.

<Configuration 6>
By the device that hangs the rear pile,
Insert the upper end of the front pile into the connection sleeve fixed to the lower end of the rear pile and lower the rear pile.
The protrusion fixed to the tip pile is passed through the part of the L-shaped notch parallel to the longitudinal direction of the pile,
The rear pile is lowered as it is, and the protrusion is abutted against the upper edge of the L-shaped notch to stop the lower pile from descending,
A part parallel to the circumferential direction of the pile of the L-shaped notch by rotating the rear pile in the direction of rotation during the excavation operation by the pile or in the opposite direction by the device that rotates the rear pile for excavation by the pile Fit into
Then, the wedge connection method according to Configuration 2, wherein a wedge is driven into a gap generated in a portion parallel to the longitudinal direction of the L-shaped cutout pile.

<Effect of Configuration 1>
The protrusion can be moved to a portion parallel to the circumferential direction of the tip pile of the L-shaped notch by the operation of lowering the rear pile with the excavator and the operation of rotating the rear pile in the excavation direction. After that, if the portion parallel to the longitudinal direction of the tip pile is filled with a wedge, the tip pile and the rear pile can be connected with high strength.
<Effect of Configuration 2>
The same connection structure can be adopted even if the connection sleeve is fixed to the lower end of the rear pile.
<Effect of Configuration 3>
It becomes possible to connect a rear pile having a larger outer diameter than the tip pile.
<Effect of Configuration 4>
It becomes possible to connect the rear pile having a larger outer diameter than the tip pile through the connection sleeve.

It is a component disassembled perspective view used for the connection structure of the pile for implementing this invention. It is a perspective view of the work process which connects the front pile 18 and the back pile 20. FIG. It is the longitudinal cross-sectional view which cut | disconnected the front pile 18 and the back pile 20 in the part without the L-shaped notch 24. FIG. (A) And (b) is a modified example perspective view of the connection structure of this invention, respectively. (A) is a longitudinal cross-sectional view of the connection structure shown in FIG.4 (b), (b) is a longitudinal cross-sectional view of the modification. It is a side view which shows the row | line | column of the apparatus for driving in a pile. It is a front view which shows the optimal example of the shape of the L-shaped notch 24. FIG.

  Hereinafter, embodiments of the present invention will be described in detail for each example.

FIG. 1 is an exploded perspective view of components used in a pile connection structure for carrying out the present invention.
In the drawing of FIG. 1 (a), the tip pile 18 shows the upper end of a pile already driven into the ground. The rear pile 20 shows the lower end of the pile to be newly driven. A connection sleeve 22 is used to connect the front pile 18 and the rear pile 20. In this example, the connection sleeve 22 is provided with L-shaped notches 24 at two locations. That is, the connection sleeve 22 fixed to the upper end of the tip pile 18 has a portion 28 parallel to the longitudinal direction of the tip pile 18 downward from the upper edge thereof, and a tip pile connected to the lower end of the parallel portion. An L-shaped notch 24 having 18 portions 32 parallel to the circumferential direction is provided.

  The protrusion 36 is fixed in advance to the side surface of the rear pile 20 by welding or the like. The L-shaped notches 24 may be increased to three or four according to the thickness of the steel pipe. When there are two L-shaped notches 24, the protrusions 36 are fixed at two corresponding positions. The connection sleeve 22 and the tip pile 18 are fixed and integrated in advance by welding or bolting. Since the connection sleeve 22 and the projection 36 may be fixed in advance at the factory, the field work can be sufficiently reduced as described below.

  The lower end of the rear pile 20 can be fixed to the connection sleeve 22 by fitting the protrusion 36 attached to the rear pile 20 into the L-shaped cutout 24 in the manner described later. Here, if the connection sleeve 22 is provided with an L-shaped cutout 24, the strength of this portion is reduced. Therefore, as shown in FIG. 1C, a reinforcing band 34 is provided so as to surround the periphery of the L-shaped cutout 24. The reinforcing band 34 may have a cylindrical shape as shown in the figure, or may have a band shape wound around this portion. The length, thickness and mounting position of the reinforcing band 34 and the connection sleeve 22 in the longitudinal direction of the pile can be freely selected according to the required connection strength.

  FIG. 1 (d) shows a state in which the reinforcing band 34 is fitted to the outside of the connection sleeve 22. The wedge 40 shown in FIG. 1B is for filling a gap generated in the L-shaped notch 24 when the connection sleeve 22 is surrounded by the reinforcing band 34. As shown in FIG. 1B, the wedge 40 is screwed into the screw hole 43 through the screw hole 44 provided in the reinforcing band 34 to prevent the wedge 40 from falling off. The wedge 40 may be fixed to the rear pile 20.

FIG. 2 is a perspective view of an operation process for connecting the front pile 18 and the rear pile 20.
In these drawings, the connection work is started with the reinforcing band 34 fitted to the outside of the connection sleeve 22. However, for the sake of easy understanding of the drawings, the portion of the reinforcing band 34 is indicated by a broken line.

  First, as shown in FIG. 2A, the lower end of the rear pile 20 is fitted into the upper end of the connection sleeve 22 and is lowered in the direction of the arrow 46. At this time, the protrusion 36 fixed to the rear pile 20 passes through a portion 28 of the L-shaped cutout 24 parallel to the longitudinal direction of the tip pile 18. When the rear pile 20 is lowered as it is, the protrusion 36 comes into contact with the lower edge of the L-shaped cutout 24 and the lowering stops.

  Then, as shown in FIG.2 (b), the back pile 20 is rotated in the rotation direction (direction of the arrow 48) at the time of excavation operation by a pile. The pile excavator includes a mechanism for hanging and lowering the pile and rotating the pile in the direction of arrow 48 in order to drive the pile while excavating. Using the driving force of this mechanism as it is, the protrusion 36 can be fitted into the portion 32 parallel to the circumferential direction of the L-shaped cutout 24. Since the pile can be rotated in the direction opposite to the arrow 48, the direction of the portion 32 parallel to the circumferential direction of the L-shaped notch 24 shown in FIG. . In either case, in the present application, the shape of the notch is expressed as an L-shape.

  At this time, a gap is formed between the lower end of the pile 20 after being fitted into the connection sleeve 22 and the reinforcing band 34. It is a space formed by a portion 28 parallel to the longitudinal direction of the tip pile 18 of the L-shaped cutout 24. By driving the wedge 40 in the direction of the arrow 50 in this gap, the gap is filled and the connection sleeve 22 is reinforced. At the same time, the protrusion 36 is fixed so as not to move in the circumferential direction. Thus, the front pile 18 and the rear pile 20 can be connected with high strength.

FIG. 3 is a longitudinal sectional view in which the front pile 18 and the rear pile 20 are cut at a portion without the L-shaped cutout 24.
Like this figure, the front pile 18 and the back pile 20 are connected in the state in which both ends were attached, and the connection sleeve 22 surrounds the outer side. Further, the reinforcing band 34 reinforces the periphery of the L-shaped cutout 24 into which the protrusion 36 and the wedge 40 are fitted. By adopting this structure, a strong connection of the steel pipe can be realized by a simple and quick connection work.

4A and 4B are perspective views of modified examples of the connection structure of the present invention.
In the example of (a), the connection sleeve 22 is fixed to the rear pile 20 in advance. An L-shaped notch 24 was provided on the lower edge of the connection sleeve 22. On the other hand, a protrusion 36 is fixed to the tip pile 18 in advance by welding or the like.

  That is, the connecting sleeve 22 fixed to the lower end of the rear pile 20 has a portion 28 parallel to the longitudinal direction of the rear pile 20 from the lower edge thereof upward, and the rear pile 20 connected to the upper end of the parallel portion. An L-shaped cutout 24 having a portion 32 parallel to the circumferential direction is provided. Further, a reinforcing band 34 is wound around the outer peripheral surface of the connection sleeve 22 so as to surround the L-shaped notch 24 of the connection sleeve 22.

  When the upper end of the front pile 18 is fitted into the lower end of the connection sleeve 22 and the rear pile 20 is lowered in the direction of the arrow 52, the protrusion 36 is formed in the longitudinal direction of the rear pile 20 of the L-shaped notch 24. Passes through a portion 28 parallel to. Further, when the rear pile 20 is rotated in the rotational direction during excavation operation by the pile, the protrusion 36 moves to a portion 32 parallel to the circumferential direction of the notched rear pile 20.

  The structure for fitting the protrusion 36 into the L-shaped cutout 24 and the structure for driving the wedge 40 are the same as in the first embodiment. Even with such a connection structure, the front pile 18 and the rear pile 20 can be connected in exactly the same procedure as described in FIG.

  In the examples so far, the outer diameter structure is such that the ends of the front pile 18 and the rear pile 20 are inserted into the connection sleeve 22. That is, the inner diameter of the connection sleeve 22 and the outer diameters of the end portions of the front pile 18 and the rear pile 20 were substantially the same. On the other hand, in the example of FIG. 4B, a pipe having the same outer shape as the rear pile 20 is used for the connection sleeve 22. In this way, the connection structure described above can be employed in a state where the rear pile 20 and the connection sleeve 22 are butt welded in advance. Thereby, it becomes possible to connect the back pile 20 whose outer diameter is thicker than the tip pile 18.

FIG. 5A shows a longitudinal sectional view of the connection structure shown in FIG. (B) shows a longitudinal sectional view of a connection structure which is further developed.
When the rear pile 20 is connected to the leading pile 18, a thicker rear pile 20 may be connected. This is a case where a pile structure that is thinner at the lower end of the pile is adopted. In such a case, the structure shown in FIG. 4B can be employed. Furthermore, in the connection structure of the present invention, for example, a cross-sectional structure as shown in FIG. That is, the upper end of the connection sleeve 22 is inserted and fixed inside the rear pile 20, and the upper end of the leading pile 18 is inserted and fixed inside the connection sleeve 22. In the illustrated example, the connection sleeve 22 is fixed by sandwiching an intervening sleeve 66 having an arbitrary thickness for adjusting the outer diameter inside the rear pile 20. These are integrated at the factory by welding and screwing. Other portions have the same structure as that shown in FIG. In this way, it becomes possible to connect the rear pile 20 having an outer shape thicker than the front pile 18.

FIG. 6 is a side view showing a row of devices for driving piles.
To implement the present invention, for example, a pile driving device 60 as shown in this figure is used. The rotating machine (auger) 62 is a device that can rotate the rear pile 20 forward or backward as indicated by an arrow 48. A tip wing for excavation is provided at the lower end of the pile driven into the ground, and the rotating machine 62 rotates the pile to drive the pile deeper into the ground. The pile driving device 60 can raise and lower the rear pile 20 by hydraulic pressure or an electric mechanism and can be driven to rotate.

  When this function is used, when the connection structure of the present invention is adopted, the front pile 18 and the rear pile 20 can be easily and quickly connected by the procedure as shown in FIG. In addition, the operation is easy because the operation is to rotate the lower pile 20 after the lower pile 20 has been lowered. The operation of driving the wedge 40 is also easy. Moreover, since the front pile 18 and the rear pile 20 are carried into the site in a state where the connection sleeve 22 and the portion 28 parallel to the longitudinal direction are previously attached at the factory, work other than the above is not required at the site. Since complicated work such as attachment of the connecting sleeve 22 and the portion 28 parallel to the longitudinal direction does not have to be performed on site, there is an effect that field work can be greatly reduced.

FIG. 7A is a front view showing an optimum example of the shape of the L-shaped cutout 24.
As shown in this figure, when the projection 36 is inserted into the portion 28 of the L-shaped cutout 24 parallel to the longitudinal direction of the pile, the width W is slightly wider than the width of the projection 36 in the same direction. Better. Thus, the protrusion 36 can be easily inserted into the portion 28 parallel to the longitudinal direction of the L-shaped cutout 24.

On the other hand, when the protrusion 36 is inserted into the portion 32 parallel to the circumferential direction of the pile, the protrusion 36 may be moved along the lower end of the L-shaped notch 24, and therefore the portion 32 parallel to the circumferential direction. There is no need for a large space in the width. Rather, the connection strength of the pile can be maintained by fitting the protrusion 36 into the portion 32 parallel to the circumferential direction without any gap.

  Further, by driving the wedge 40 shown in FIG. 1 into the portion 28 parallel to the longitudinal direction of the pile, the gap of the L-shaped notch 24 can be completely filled. In this way, it is possible to prevent the protrusion 36 from returning and increase the strength of the connection portion.

  In addition, if the bead by welding is formed around the protrusion 36 when the protrusion 36 is welded to the rear pile 20, it becomes impossible to fit the protrusion 36 into the portion 32 parallel to the circumferential direction. Therefore, as shown in FIG. 7B, it is preferable that the protrusion 36 is formed in an annular shape and the bead 64 remains along the inner side of the ring so that the protrusion 36 is welded to the side surface of the rear pile 20. Alternatively, the protrusion 36 is preferably fixed to the side surface of the rear pile 20 by screwing or the like.

18 Lead pile 20 Rear pile 22 Connection sleeve 24 L-shaped notch 28 Parallel part in the longitudinal direction 32 Parallel part in the circumferential direction 34 Reinforcement band 36 Protrusion 38 Welding part 40 Wedge 42 Screw 43 Screw hole 44 Screw hole 46 Arrow 48 arrow 50 arrow 52 arrow 54 weld 60 pile driver 62 rotating machine 64 bead 66 interposition sleeve

Claims (6)

It is a structure for connecting the lower end of the pile after being newly driven into the upper end of the tip pile driven into the ground,
The connection sleeve fixed to the upper end of the tip pile has a portion parallel to the longitudinal direction of the tip pile downward from its upper edge and parallel to the circumferential direction of the tip pile connected to the lower end of the parallel portion. An L-shaped notch with a portion is provided,
A reinforcing band wound around the outer peripheral surface of the connection sleeve so as to surround the L-shaped notch of the connection sleeve;
When the lower end of the rear pile is fitted and lowered from the upper end of the connection sleeve, it passes through a portion parallel to the longitudinal direction of the tip pile of the L-shaped notch, and the rear pile is excavated by the pile. A protrusion that moves to a portion parallel to the circumferential direction of the notch of the notch when it is rotated in the rotational direction during operation or in the opposite direction is fixed to the outer peripheral surface of the lower end of the rear pile, and this The protrusion has a shape that fits into a portion parallel to the circumferential direction of the tip of the notch,
A wedge for filling a portion parallel to the longitudinal direction of the tip pile of the L-shaped notch formed between the lower end of the rear pile fitted into the connection sleeve and the reinforcing band is provided. And pile connection structure. It is a structure for connecting the lower end of the pile after being newly driven into the upper end of the tip pile driven into the ground,
The connecting sleeve fixed to the lower end of the rear pile has a portion parallel to the longitudinal direction of the rear pile from the lower edge upward and parallel to the circumferential direction of the rear pile connected to the upper end of the parallel portion. An L-shaped notch with a portion is provided,
A reinforcing band wound around the outer peripheral surface of the connection sleeve so as to surround the L-shaped notch of the connection sleeve;
When the upper end of the front pile is fitted into the lower end of the connection sleeve and the rear pile is lowered, the L-shaped notch passes through a portion parallel to the longitudinal direction of the rear pile, and the rear When the pile is rotated in the direction of rotation during the excavation operation by the pile or in the opposite direction, a protrusion that moves to the part parallel to the circumferential direction of the pile after the above notch is fixed to the upper end outer peripheral surface of the tip pile. And the protrusion has a shape that fits into a part parallel to the circumferential direction of the pile after the cutout,
A wedge for filling a portion parallel to the longitudinal direction of the rear pile of the L-shaped notch formed between the upper end of the tip pile fitted into the connection sleeve and the reinforcing band; And pile connection structure.   The pile connection structure according to claim 2, wherein a pipe having the same outer shape as that of the rear pile is fixed to the connection sleeve.   The pile connection structure according to claim 2, wherein the upper end of the connection sleeve is inserted into the rear pile, and the upper end of the tip pile is fixed to the inner side of the connection sleeve. By the device that hangs the rear pile,
Fit the lower end of the rear pile to the upper end of the connection sleeve fixed to the front pile and lower the rear pile,
The protrusion fixed to the rear pile is passed through the part of the L-shaped notch parallel to the longitudinal direction of the pile,
Lower the rear pile as it is, stop the lower pile from descending by hitting the protrusion against the lower edge of the L-shaped notch,
A part parallel to the circumferential direction of the pile of the L-shaped notch by rotating the rear pile in the direction of rotation during the excavation operation by the pile or in the opposite direction by the device that rotates the rear pile for excavation by the pile Fit into
2. The method of connecting piles according to claim 1, wherein a wedge is driven into a gap generated in a portion parallel to the longitudinal direction of the L-shaped cutout pile. By the device that hangs the rear pile,
Insert the upper end of the front pile into the connection sleeve fixed to the lower end of the rear pile and lower the rear pile.
The protrusion fixed to the tip pile is passed through the part of the L-shaped notch parallel to the longitudinal direction of the pile,
The rear pile is lowered as it is, and the protrusion is abutted against the upper edge of the L-shaped notch to stop the lower pile from descending,
A part parallel to the circumferential direction of the pile of the L-shaped notch by rotating the rear pile in the direction of rotation during the excavation operation by the pile or in the opposite direction by the device that rotates the rear pile for excavation by the pile Fit into
3. The method for connecting piles according to claim 2, wherein a wedge is driven into a gap generated in a portion parallel to the longitudinal direction of the L-shaped cutout pile.

Images