JP2001303560A - Method for processing head of concrete pile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily crush and remove in a very short time the head of a concrete pile protruding out of the ground. SOLUTION: A plurality of vertical holes 17 are cut in the top 1b of the concrete pile 1 protruding out of the ground 3. Tapered split plates formed of a material harder than the concrete pile 1 are fitted into the vertical holes 17 and enlargers are forcibly press fitted in between the split plates to crush the head of the concrete pile 1. Thereafter, a plurality of horizontal holes 27 are cut in the remainder 25 left on the head la of the concrete pile 1. The split plates are fitted into the horizontal holes 27 and the enlargers are forcibly press fitted in between the split plates to crush the remainder 25 of the concrete pile 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of treating a head of a concrete pile, and more particularly to a method of treating a head of a concrete pile formed by pouring a concrete material into a foundation hole obtained by excavating the ground. Regarding improvement.

[0002]

2. Description of the Related Art In a reinforced concrete construction building, if a concrete pile formed on the ground and a reinforced concrete pillar constructed on the ground are integrally cast from the beginning, the strength of the upper part becomes lower than that of the lower part. Therefore, it is common to form a concrete pile in advance, and then connect a reinforced concrete pillar to this.

Conventionally, as shown in FIG. 15, such a concrete pile 1 is constructed by, for example, placing a reinforcing steel cage 7 in a foundation hole 5 dug vertically in a ground 3 and pouring a concrete material into it. In addition, the head 1a of the concrete pile 1 protruding from the ground surface 9 was required to be crushed and removed little by little while banging it with a rock drill 11 called a breaker to expose the upper part of the reinforcing steel cage 7. FIG.
Reference numeral 3a in the inside is a supporting ground harder than the ground 3.

Then, the concrete foundation 1 (not shown) is concretely constructed on the concrete pile 1 from which the head 1a has been removed, and a reinforced concrete column or the like is assembled by connecting the reinforcing bar 7 and the reinforcing bar.

[0005]

However, the work of pulverizing and removing the head of the concrete pile 1 once hardened by the rock drill 11 requires extremely large labor and a long time. For example, the concrete pile 1 having a diameter of about 2 m is required. Even if the head was ground and removed about 1 m from above, it took about one and a half days.

In addition, since the operator needs to press the rock drill 11 operating while slamming with vibration against the concrete pile 1 for a long time, it is not physically desirable.

The present invention has been made in order to solve such a conventional drawback, and a head capable of extremely easily and easily crushing and removing the head protruding from the ground in a concrete pile. It is intended to provide a method of processing a section.

[0008]

In order to solve such a problem, the present invention is to provide a plurality of vertical holes at predetermined intervals from a top of a concrete pile projecting from the ground in an annular or arcuate shape. Insert a pair of split rods formed from a hard material from a hard material into a vertically elongated and tapered tip into the vertical hole from the tip, forcibly press-fit a spreader between the split rods from the outside, and push between the split rods. The concrete pile is crushed, and a plurality of lateral holes are provided at predetermined intervals in the remaining portion of the concrete pile head crushing, the dividing rods are fitted into the lateral holes from the tip, and between the dividing rods from outside. This is a method of removing the head of the concrete pile by forcibly press-fitting the spreader and squeezing the remainder of the crushed head so as to push between the divided rods.

In the present invention, it is preferable that the end of the vertical hole is formed obliquely with the tip facing the outside of the concrete pile.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. Note that the same reference numerals are given to portions common to the conventional example.

First, a method of constructing a concrete pile of a driven pile (earth pile) for carrying out the present invention will be briefly described.
2 to 6 are views showing steps for explaining the concrete pile construction method.

In FIG. 2, the ground 3 is drilled in the longitudinal direction to, for example, the support ground 3a, and a hollow base hole 5 is formed. This boring is performed by a conventionally known method, such as a middle digging method, a pre-boring method, an earth drill method, an all casing method, or the like.

Along with the formation of the foundation hole 5 or in advance, as shown in FIG. 3, a plurality of main reinforcing bars 7a are arranged in a ring shape, and a ring-shaped band reinforcing bar 7b is welded to the main reinforcing bars 7a at predetermined intervals in the longitudinal direction. Then, a reinforcing cage 7 formed into an elongated cage shape is prepared. The rebar cage 7 has a dimension slightly longer than the depth of the foundation hole 5.

As shown in FIG. 4, a steel cylindrical casing 13 is press-fitted from the ground surface 9 side into the foundation hole 5 so that its inner wall does not collapse, as shown in FIG. The rebar basket 7 is inserted substantially concentrically.

The cylindrical casing 13 is 1 to several meters from the ground surface 9.
It is constructed in a protruding state, and the reinforcing bar 7 is also a cylindrical casing 1
It is constructed in a state where it protrudes from the ground surface 9 within 3.

Thereafter, as shown in FIG. 5, a known concrete material 15 is poured into the foundation hole 5 by a conventionally known method and solidified, and as shown in FIG. 6, the cylindrical casing 13 is removed. The concrete pile 1 is completed (see FIG. 1A).

Next, a method of treating the head of the concrete pile 1 according to the present invention will be described. First, as shown in FIGS. 7 and 8, the top (top end) 1 of the head 1 a of the concrete pile 1
b, a plurality of vertical holes along the axial direction (longitudinal direction) of the concrete pile 1 by using a drill (not shown) in a region inside an imaginary circle formed by the tips of the plurality of main reinforcing bars 7a forming the reinforcing bar cage 7. 17 is formed by cutting (see FIG. 1B).

The plurality of vertical holes 17 are located in an annular or arcuate shape on a concentric circle supposed to be several tens cm inside the virtual circle formed by the main reinforcing bar 7a, and the individual vertical holes 17 are adjacent to each other. The main reinforcing bars 7a are cut obliquely from the top (upper end surface) 1b toward the outside through the space therebetween.

For example, in a concrete pile 1 having a diameter of 2 m, the vertical hole 17 has an inner diameter of 5 to 7 cm and a depth of 60 cm.
And 30 ° to 50 ° with respect to the axial direction of the concrete pile 1
At an angle (θ).

In this vertical hole 17, as shown in FIG. 9A,
As shown in FIG. 8, a hardened material, for example, a steel material, such as a steel material, which is formed into a half-split shape and tapered into a split bar, for example, a pair of seria plates 19, is fitted from the tapered tip as shown in FIG.
Further, as shown in FIG. 9B, a material harder than the concrete pile 1, for example, an expanded plate formed by tapering a steel material like the seria plate 19, for example, a seria 21 is placed between the pair of seria plates 19 as shown in FIG. Then, the ceria 21 is forcibly struck with the hammer 23 and is pressed deeply into the space between the ceria plates 19 (see FIG. 1C).

As the hammer tool 23, a breaker, for example, which can automatically and continuously strike the ceria 21 by a compressor is preferable.

Then, the periphery of the vertical hole 17 is forcibly expanded between the pair of ceria plates 19 by the ceria 21, and mainly around the main reinforcing bar 7 a and the concrete pile 1 outside this.
Is partially crushed.

When all the vertical holes 17 formed in a ring are crushed in the same manner using the ceria plate 19 and the ceria 21,
As shown in FIG. 10, the outer concrete portion is crushed and removed from the periphery of the main reinforcing bar 7 a of the reinforcing bar cage 7, and a truncated cone-shaped remaining portion 25 remains in an inner region surrounded by the main reinforcing bar 7 a.

In the drawings of the present specification, the trace of crushing the concrete pile 1 is drawn with a straight line, but it is well known that the trace actually becomes uneven.

Next, as shown in FIG. 10 and FIG. 11, a not-shown drill is used to drill the remaining portion 25 of the truncated cone in a direction perpendicular to the axial direction of the concrete pile 1 and toward the center of the concrete pile 1. The plurality of lateral holes 27 are cut into a ring at predetermined intervals (see FIG. 1D).

The pair of seria plates 19 described above are fitted into the lateral holes 27 from the tapered ends as shown in FIG.
Insert the seria 21 between the seria plates 19 and set the hammer 2
3 forcibly crush the cellar 21 to the cellar plate 19
Press deeply into the space.

Then, the periphery of the horizontal hole 27 is forcibly expanded between the pair of ceria plates 19 by the ceria 21 and partially crushed upward mainly of the remaining crushed portion 25 to be removed.
As shown in FIG. 2, the head treatment of the concrete pile 1 is completed (see FIG. 1E).

Although not shown, depending on the size of the concrete pile 1 and the size of the crushing remaining portion 25, a vertical hole similar to the above-described vertical hole 17 is appropriately cut and formed from the top of the crushing remaining portion 25. When the technique of forcibly inserting the plate 19 into the vertical hole and crushing is also used, the removal of the remaining crushing portion 25 becomes easy.

Although not shown, the concrete foundation 1 is formed on the concrete pile 1 from which the head 1a has been removed, as described above. Assemble

In the embodiment of the present invention, as shown in FIG. 8, the annular lateral groove U is cut with a cutter at a position corresponding to the position from the top 1b to the collapsed position on the head 1a of the concrete pile 1. A cutting agent is cut to a depth of 100 mm, and a chemical agent for expanding the concrete material 15 to weaken the structure is applied to the lateral groove U and the vicinity thereof, thereby facilitating the positioning of the portion to be removed and the crushing, and further improving the appearance. It is good to try.

As described above, in the method for treating the head of a concrete pile according to the present invention, a plurality of vertical holes 17 are provided annularly at predetermined intervals from the top 1b of the concrete pile 1 projecting from the ground 3, and the tip is tapered. A pair of steel seria 1
9 into the vertical hole 17 from the tip,
Forcibly press the steel seria 21 between the hammers 2
3, the concrete pile 1 is partially crushed so as to push the gap between the seriae plates 19, and a plurality of lateral holes 27 are provided at predetermined intervals in an annular shape in the crushing remaining portion 25 remaining on the head 1a. Then, the seria plate 19 is inserted into the lateral hole 27 from the tip, the seria 21 is forcibly press-fitted from outside to the seria plate 19 and spread by a hammer tool 23 to crush the remaining portion 25 and the head thereof. Remove.

Therefore, when the seria 21 inserted between the seria plates 19 is hit with a hammer 23 several times with a strong force, the concrete pile 1 around the vertical hole 17 is easily crushed and removed, and the remaining crush 25 is also removed. A horizontal hole 27 is formed, and the ceria plate 19,
Similarly, it can be easily crushed and removed using a hammer tool 23 composed of a cellia 21, a breaker or a compressor.

Therefore, compared with the conventional method in which the head 1a of the concrete pile 1 is gradually crushed and removed by the rock drill 11, it is possible to crush and remove the head 1a in a very short time and easily. The work that required half was reduced to about half a day, resulting in extremely high efficiency.

In the above-described embodiment, the treatment of the head of the concrete pile 1 with the reinforcing bars having the reinforcing bars 7 embedded therein is shown. However, the present invention is not limited to this, and the reinforcing bars 7 are not embedded. The present invention is also applicable to a steel pipe pile type concrete pile 1.

That is, as shown in FIG. 4 described above, a steel cylindrical casing 13 is press-fitted into the foundation hole 5 from the ground surface 9 side to reinforce it, and the H steel 29 is placed on the ground 3 so as to sandwich the foundation hole 5. Then, a known concrete material 15 is poured into the foundation hole 5 in which the reinforcing cage 7 is not inserted by a conventionally known method and solidified, and the concrete pile 1 is constructed as shown in FIGS. 13 and 14.

Then, as shown in FIG. 13, the above-described vertical hole 17 is similarly cut and formed from the top 1b of the concrete pile 1, and the head of the concrete pile 1 is formed using the ceria plate 19, the ceria 21 and the hammer 23. Crush 1a.

Further, as shown in FIG. 14, a plurality of the above-described transverse holes 27 are cut and formed in an arc shape in the truncated conical portion 25 (indicated by a broken line in FIG. 13).
9, the processing is completed by crushing the head 1a of the concrete pile 1 using the ceria 21 and the hammer 23 (indicated by a dashed line in FIG. 13).

As described above, in the present invention, the horizontal hole 27 cut from the top 1b of the concrete pile 1 may be formed not only in an annular shape but also in an arc shape, and the vertical hole 17 is not limited to an annular shape but in an arc shape. (Including a straight line or a curved line). In short, what is necessary is just to determine according to the shape of the head 1a of the constructed concrete pile 1.

Further, the vertical hole 17 is not limited to the example formed by cutting obliquely as described above, but may be formed along the vertical direction according to the size and shape of the concrete pile 1.

Further, the number of the pair of transmission plates 19 is not limited to two, and a pair of plural (for example, three) transmission plates is also possible. The transmission plate 19 is not limited to this and can be implemented by another divided plate. is there.

Further, it is possible to use the seria plate 19 of any shape according to the seria 21,
The present invention is not limited to the area 21 and can be implemented with an expanding device that can expand the area plate 19.

[0042]

As described above, in the method for treating the head of a concrete pile according to the present invention, a plurality of vertical holes are formed in an annular or arc shape from the top of the concrete pile projecting from the ground, and the concrete pile is made of a harder material than the concrete pile. The pair of split rods having a vertically elongated and tapered tip are fitted into the vertical holes from the tip, and a forcing tool is forcibly inserted between the split rods from the outside so as to push and spread the gap between the split rods. A plurality of horizontal holes are provided at predetermined intervals in the remaining portion of the crushed head, the split rods are fitted into the horizontal holes from the front end, and a spreader is forcibly press-fitted between the split rods from the outside to divide them. Since the head is crushed and the remaining part is removed by pushing the rods apart, the head of the concrete pile is crushed little by little with a rock drill as in the conventional method. Less than It is possible to easily pulverized removed in a short time, it is possible to improve the operator's working environment. In the method in which the vertical hole is formed obliquely toward the outside of the concrete pile, the head of the concrete pile can be crushed and removed more reliably and easily, and there is an effect that the productivity of the treatment is further improved.

[Brief description of the drawings]

FIG. 1 is a diagram showing steps of a head processing method according to the present invention.

FIG. 2 is a longitudinal sectional view showing a method of constructing a concrete pile.

FIG. 3 is a schematic perspective view showing a reinforcing cage used for a concrete pile.

FIG. 4 is a longitudinal sectional view showing a method of constructing a concrete pile.

FIG. 5 is a longitudinal sectional view showing a method of constructing a concrete pile.

FIG. 6 is a longitudinal sectional view showing a completed concrete pile.

FIG. 7 is a top view showing an embodiment of a head processing method according to the present invention.

FIG. 8 is a vertical sectional view of a main part showing an embodiment of a head processing method according to the present invention.

FIG. 9 is a perspective view showing a dividing rod and a spreader used in the head treatment method of the present invention.

FIG. 10 is a side view showing an embodiment of the head processing method according to the present invention.

FIG. 11 is a top view showing an embodiment of the head processing method according to the present invention.

FIG. 12 is a main part side view showing a concrete pile on which head processing is completed by the head processing method of the present invention.

FIG. 13 is a vertical sectional view of a main part showing another embodiment of the head processing method according to the present invention.

14 is a main part top view showing the head processing method of FIG. 13;

FIG. 15 is a longitudinal sectional view for explaining a conventional method for treating the head of a concrete pile.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Concrete pile 1a Concrete pile head 1b Concrete pile top 3 Ground 3a Supporting ground 5 Foundation hole 7 Reinforcing cage 7a Main reinforcing bar 7b Band reinforcing bar 9 Ground surface 11 Rock drill 13 Casing 15 Concrete material 17 Vertical hole 19 21) Seria (spreading tool) 23 Hammer tool (breaker) 25 Remains of crushing 27 Side hole 29 H steel U Side groove

Claims (2)

[Claims] 1. A method for treating a head of a concrete pile driven into the ground and protruding from the ground, wherein a plurality of vertical holes are provided at predetermined intervals from the top in an annular or arcuate shape. Step 1, a pair of split rods formed from a harder material than the concrete pile and having an elongated and tapered tip is fitted into the vertical hole from the tip, and a spreader is forcibly press-fitted between the split rods from the outside, and the split is performed. A second step of crushing the concrete pile so as to spread the gap between the rods; a third step of providing a plurality of lateral holes at predetermined intervals in the remaining crushed head of the concrete pile; A fourth step of fitting the spreader into the lateral hole from the tip, forcibly press-fitting a spreader between the split bars from the outside, and crushing the remaining portion of the concrete pile head crushing so as to push and spread between the split bars, With Head processing method of concrete piles which is characterized in that. 2. The method according to claim 1, wherein the first step is to form the oblique vertical hole with its tip directed outward.