JPH0738391Y2 - Embankment reinforcement pile - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to an embankment reinforced pile, and more specifically, it is possible to easily correct the pile direction while driving the pile and to strengthen the pile tip strength. The embankment reinforcement piles.

[Prior Art] Reinforcement piles are driven into the embankment slope and the cut slope in the mountain area. This reinforces the embankment / cut-off area around the slope and guides the infiltrated water to the inside of the reinforcing pile when there is more precipitation than the water infiltration capacity with respect to the embankment and cut-off slope soil properties. This is to prevent shear slippage (slope collapse) on the slope by discharging the slope to the outside.

By the way, conventionally, as shown in FIG.
Closing the tip of the pile into an acute-angled plane, and expanding into a bifurcated shape,
In other words, the permeated water guiding holes are formed at appropriate intervals on the peripheral wall of the cylindrical pile which is flat-machined like "Mix", and the filter is inserted therein.

And, according to the reinforcing pile, the above-mentioned reinforcing measures and collapse measures due to rainwater can be satisfied.

[Problems to be solved by the device]

However, the above-mentioned reinforcing pile has the following problems.

Since the tip of the pile is shaped like a "pile", the strength of the tip of the pile is weak and it is difficult to determine the directionality when driving into the soil.

If the direction is corrected or corrected during the driving, and the straight driving is attempted, the pile itself may be bent or deformed in an arc shape, and the internal filter effect may be reduced.

If the length of the pile is 3 m or more, it may be difficult to correct the direction, and if the hammer hits the surface of the hammer due to mechanical deformation and the soil quality is poor, it may be impossible to drive.

When the soil is clay-like, and the particles are small, the particles are mixed from the permeated water guide holes, clogging of the filter occurs, and the effect as a reinforcing pile is lost in a short period of time.

The present invention was made in consideration of the above-mentioned points, and the purpose thereof is to make it possible to easily correct the pile direction during the driving of the pile and to strengthen the embankment for strengthening the pile tip strength. To provide a stake.

[Means for Solving the Problems]

And, the embankment reinforcement pile of the present invention as a means for solving the above-mentioned problems, the perforated water guide holes are formed at appropriate intervals in the peripheral wall of the cylindrical pile whose tip is closed, and a filter is inserted therein. In the embankment reinforcement pile formed as described above, an X-shaped narrowed portion is formed at the tip of the tubular pile.

Further, the embankment reinforcing pile of the present invention has the above-mentioned structure, in which a sleeve is inserted into the rear peripheral wall of the narrowed portion of the tubular pile or a convex portion is formed.

[Action]

In addition, the embankment reinforcement pile of the present invention based on the above-mentioned structure is formed with an X-shaped narrowing portion at the pile tip portion to appropriately reduce the pile tip diameter and increase the strength thereof. It works so that a straight driving operation can be performed without increasing.

In addition, the embankment reinforcement pile of the present invention has a small plane shape instead of a point or a linear shape at the tip of the pile, so that the direction is not fixed and the pile reinforcement can be corrected during driving.

Further, when the sleeve is inserted outside or the convex portion is formed on the rear peripheral wall of the narrowed portion of the pile, the soil pressure around the pile is relaxed and the water permeability coefficient can be increased.

As described above, the embankment reinforcement pile of the present invention is characterized in that the X-shaped narrowed portion is formed at the tip of the pile, and due to this feature, the pile direction can be easily corrected while driving the pile. , It is a pile that can strengthen the tip strength of the pile.

〔Example〕

Embodiments embodying the present invention will be described below with reference to the drawings.

Here, FIGS. 1 to 3 show an embodiment of the present invention.
The figure is a side view, FIG. 2 is a front view of the tip of the pile, and FIG. 3 is a perspective view for explaining the internal structure of the pile.

The embankment reinforcement pile of the present embodiment is roughly formed by forming an X-shaped narrowing portion 3 on the pile tip portion 2 of a cylindrical pile 1 and forming a permeated water guiding hole 4 on the peripheral wall of the pile 1. The filter 5 is inserted inside the pile.

The pile 1 is a steel pipe reinforced pile, which is hollow and has an X on the tip 2 of the pile.
Formed portion 3 is formed. The X-shaped throttle portion 3 is formed on the tip portion 3 having a length of about 100 mm from the tip of the pile 1,
The outer diameter of the outer periphery of the shape is narrowed to be about 1/4 smaller than the outer diameter of the peripheral wall of the pile, and the tip is closed. Further, the starting end and the terminating end of the tip end portion 3 in the X-diameter convex portion are formed in a tapered shape.

A slit-shaped permeated water guide hole 4 is formed in the peripheral wall of the pile main body that extends behind the pile tip portion 2 of the pile 1. The permeated water guide holes 4 are rectangular slits with a width of 5 mm and a length of 50 mm that guide the permeated water from the outside of the peripheral wall to the inside of the pile, and are bored at an angular interval of 90 ° on the same circumference, that is, four bores are bored. Has been done. Here, the adjacent permeated water guiding holes 4 in the same circumferential direction are
It is drilled at 45 °, with its phase shifted. In addition, the permeated water guide hole 4 is a hammer contact part 6 at the rear end of the pile (when the total length of the pile is 2000 mm, a part from the rear end to a position of 150 mm).
And is provided on the peripheral wall of the pile main body excluding the pile tip portion 2.

Then, as shown in FIG. 3, a filter 5 is inserted and disposed inside the permeated water guiding hole 4, that is, inside the cylindrical body forming the pile 1 (usually only the straight pipe portion). The filter 5 uses a polyethylene mesh tube that is a commonly used underdrain drainage pipe. Then, the soil mixed with the permeated water is filtered from the permeated water guide hole 4.

In addition, the pile 1 usually has a length of 2000 to 3000 mm, and the joint pile 8 is replenished by the sleeve 7.
Similar to the pile (tip pile) 1, the joint pile 8 is formed of a steel pipe having the same diameter and the same material, a plurality of permeated water guiding holes 4 are formed in the peripheral wall, and a filter is provided inside the pile. 5 is inserted. Here, as the filter 5, a filter having a length in a state where the tip pile 1 and the joint pile 8 are joined is used.

Next, the operation of the embankment reinforcing pile of the present embodiment described above will be described.

The embankment reinforcement pile 1 of the present embodiment is driven into the soil from the pile tip portion 2 like the conventional embankment reinforcement pile. Here, since the X-shaped narrowed portion 3 is formed in the pile tip portion 2 of the pile 1, the strength thereof is strongly retained, and the pile tip portion 2 can be driven at the time of driving without extremely increasing the driving resistance. There is no risk of bending and changing its direction, or making it impossible to drive. In addition, since it is guided by the taper portion of the X-shaped throttle portion 3 and the tapered surface of the aperture, it works so that a straight hammering operation can be performed. . In addition, since the tip of the pile is not a point or a line shape but a small plane shape, the directionality is not fixed, and it can be corrected during driving.

The embankment reinforcement pile 1 that is driven into the soil (embankment slope, mountain cut slope, etc.) reinforces the periphery of the embankment as well as the conventional embankment reinforcement pile, and at the same time protects the embankment and the slope slope soil from water. When there is more precipitation than the permeation capacity of the above, the permeated water is guided into the reinforcing pile 1 through the permeated water guide hole 4 and the filter 5 and discharged to the outside, and shear slip of the slope (slope collapse). ) Acts to prevent.

When the joint pile 8 is added to the reinforcing pile (tip pile) 1 via the sleeve 7, the sleeve 7 reinforces the bending stress at the time of driving.

It should be noted that the present invention is not limited to the above-described embodiments, but includes modifications that can be implemented without departing from the spirit of the present invention. Incidentally, as shown in FIG. 4, a sleeve or a convex portion 9 may be externally inserted or formed on the rear portion of the pile tip portion 2 of the embankment reinforcement pile 1. In the case of this configuration, since the outer diameter of the pile is formed to be large in appearance by the sleeve and the convex portion 9, the earth pressure around the pile is loosened, and the water permeability coefficient can be increased. Further, the embankment reinforcement pile of the present invention is not limited to the above-mentioned embodiment, and the pile length and size, the shape and size of the permeated water guiding hole, the length of the pile tip portion,
It goes without saying that the material and type of the filter can be changed appropriately.

[Effect of device]

As is clear from the above description, since the embankment reinforcement pile of the present invention has the X-shaped narrowing portion formed at the tip of the pile, the pile direction can be easily corrected while the pile is being driven, and the pile tip strength can be improved. Has the effect of being able to strengthen.

[Brief description of drawings]

1 to 3 show an embodiment of the present invention, FIG. 1 is a side view, FIG. 2 is a front view of the pile tip, FIG. 3 is a perspective view for explaining the internal structure of the pile, and FIG. FIG. 5 is a side view of another embodiment of the present invention, FIG. 5 shows a conventional example, FIG. 5 (a) is a side view, and FIG. 5 (b) is a side view in a state of being displaced by 45 ° in the circumferential direction. It is a figure. 1 ... Pile (tip pile), 2 ... Pile tip, 3 ... X-shaped throttle, 4 ... Penetration water guide hole, 5 ... Filter, 6 ... Hammer contact part at the rear of pile, 7 ... … Sleeve, 8 …… Joint pile

Claims (2)

[Scope of utility model registration request] 1. A embankment reinforcement pile in which permeated water guiding holes are formed at appropriate intervals on a peripheral wall of a cylindrical pile having a closed end, and a filter is inserted thereinto, at the tip portion of the cylindrical pile. An embankment reinforcement pile characterized by forming an X-shaped narrowed portion. 2. The embankment reinforcement pile according to claim 1, wherein a sleeve is externally inserted or a convex portion is formed on the rear peripheral wall of the narrowed portion of the tubular pile.