JP5046038B2 - Crushing head for hollow concrete pile - Google Patents

Description

  The present invention relates to a crushing head for a hollow concrete pile that is used to crush a hollow concrete pile that has already been buried when a new foundation pile is constructed.

  At the site where a new foundation pile is constructed, a hollow concrete pile has already been buried, and if this existing pile is in the vicinity of the foundation pile to be constructed, it may interfere with the construction. In some cases, the existing hollow concrete pile was rebuilt for some reason during the construction. In these cases, it was necessary to remove the existing hollow concrete pile.

  Conventionally, an apparatus in which a blade for crushing is provided at the lower end and an apparatus for crushing a hollow concrete pile from the upper surface while rotating the blade has been used (for example, Patent Documents 2 and 3).

Since these devices are large, handling is complicated, and the crushing efficiency is low, the applicant configures the crushing device by providing a crushing blade on the outer periphery of the spiral blade, and faces the outside from the hollow part of the hollow concrete pile. And proposed a device for crushing (Patent Document 1).
JP 9-203039 A JP-A-61-250230 JP-A-4-368513

  In the prior art, the spiral blade is twisted somewhat (about 60 degrees in plan view) and has a plate-like structure, which is convenient when the reinforcing bars are wound and removed after crushing with a crushing blade. However, the load generated on the spiral blade during crushing is large, and the thickness of the spiral blade has to be increased. Moreover, since the hollow concrete pile has a steel end plate, in order to remove the end plate, a separate work for removing the end plate has been required.

  However, the present invention has solved the above-mentioned problems because the blade tips of the crushing blades are arranged downward with a space therebetween using spiral blades twisted at least 180 degrees or more.

That is, this invention is the crushing head of the hollow concrete pile characterized by having been comprised as follows.
(1) A spiral blade is disposed on a head body having a connecting portion with a rotating rod.
(2) The spiral blade was formed so that the radius gradually increased from the lower end toward the upper end, and the lower end radius was formed smaller than the inner diameter of the hollow concrete pile to be crushed.
(3) A plurality of crushing blades are fixed to the outer peripheral wall of the spiral blade at a predetermined interval, the cutting edge of the crushing blade is positioned downward from the lower surface of the spiral blade at the mounting position, and the base end of the crushing blade Was positioned upward from the upper surface of the spiral blade at the mounting position.
(4) Each of the spiral blades is “at least two spiral blades are arranged out of phase and formed in a range of at least 180 degrees around the axis of the head body.” Form so that a plurality of crushing blades are positioned vertically in the radial direction from the shaft. "

  Moreover, it is the crushing apparatus of the hollow concrete pile which formed the gap | interval of the crushing blade in the above in larger than the width | variety of the ring-shaped end plate of the hollow concrete pile planned to crush. Furthermore, it is the crushing apparatus of the hollow concrete pile which attached the removal head which can remove the filling solidified material of the hollow part of the hollow concrete pile which is due to crush to the lower end of the head main body.

  The crushing head of the present invention is provided with a spiral blade having a turning angle of 180 degrees or more around the axis of the head body, and provided with a downward crushing blade disposed at a predetermined interval, or vertically from the axis of the head body in the radial direction. Since the crushing blades are positioned so that a plurality of crushing blades are positioned at the same position, the pile walls above and below the end plates can be crushed even if there are joint end plates of hollow concrete piles, and the crushing efficiency is improved. Moreover, since the upper end of the crushing blades arranged at a predetermined interval is positioned above the upper surface of the spiral blade, the lower pile wall can be crushed with the remaining end plates locked.

The crushing head 1 is formed with an upper connecting portion 3 and a lower connecting portion 4 with other rods above and below the hollow cylindrical head main body 2, and crushing blades 10, 10 are provided on the side surface 2 a of the head main body 2. Two spiral blades 5 and 5 are provided and configured (FIGS. 1 and 3). The spiral blades 5 and 5 are out of phase, and the two spiral blades 5 and 5 are attached rotationally symmetrically with respect to the shaft 2b.
Each spiral blade 5 is formed so that the turning angle is slightly smaller than one rotation, and gradually increases from the lower end 6 (diameter D ₀ ) to the upper end 7 (diameter D ₀₀ ) with a radius (from the head body axis 2b). torsion radius) is formed so as to increase the diameter D ₀ of the bottom 6, is formed smaller than the inner diameter of the hollow concrete piles 30 of the crushing plan (Figure 3 (b)).
The crushing blades 10 and 10 are fixed to the outer peripheral wall 8 of the spiral blade 5 with a gap 14 and the blade tip 12 facing obliquely downward, and the base end 11 of the crushing blade 10 is the upper surface of the spiral blade 5 at a fixed position. It is located above 5b (FIG. 3B).
Also, crushing blades 10, 10 up and down in the radial direction _{Y 11, Y 12, Y 21} , Y 22, crushing blades 10, 10 are more disposed (Figure 3 (b)).

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

[1] Configuration of crushing head 1

(1) The upper connecting portion 3 with another rod is formed at the upper end of the hollow cylindrical head body 2 in which the shaft 2b is arranged vertically, and the lower connecting portion 4 with another member or rod is formed at the lower end. . Two spiral blades 5 and 5 are attached to the side surface 2a of the head main body 2 with the center in the length direction of the head main body 2 as an axis 2b in different phases. Accordingly, the two spiral blades 5 and 5 are attached rotationally symmetrically with respect to the shaft 2b.

Each spiral blade 5 is formed so that the radius (the radius of torsion from the shaft 2b of the head body) gradually increases from the lower end 6 toward the upper end 7, and the diameter D of the lower end 6 of the spiral blades 5 and 5 is increased. _0, as the diameter _{D 0} 0 of the upper end 7, the diameter _{D 0} of the bottom 7 is smaller than the inner diameter of the hollow concrete piles 30 of the crushing schedule. The diameter of the spiral blade 5 is set as follows, for example.
Lower end D ₀ = 600 mm
Upper end D ₀₀ = 1300mm
Further, the spiral blades 5 and 5 are formed at a turning angle of about 315 degrees (slightly smaller than one round, a range of torsion from the upper end 6 toward the lower end 7).

The crushing blades 10 and 10 are fixed to the outer peripheral wall 8 of the spiral blade 5. The crushing blades 10 are fixed at the same height position (position symmetric in diameter with respect to the axis 2b of the head main body 2) by the two spiral blades 5 and 5, and five crushing blades 10 are attached with a predetermined interval 14 therebetween. Depending on the lower end (D ₀ ) of the spiral blade 5 and the outer diameter of the hollow concrete pile to be crushed, the spiral blades 5 are arranged at positions of diameters D _{1 to} D ₄ (FIG. 3B). According to the standard of the outer diameter of hollow concrete piles that are widely used in
D ₀ = Φ600mm
D ₁ = Φ750mm
D ₂ = Φ900mm
D ₃ = Φ1050mm
D ₄ = Φ1200mm
If it is this standard, it can respond to the crushing of the hollow concrete pile of outer diameter 900mm (inner diameter 660mm)-outer diameter 1200mm (inner diameter 900mm).

(2) Further, the crushing blade 10 is fixed downward along the inclination of the outer peripheral wall 8 of the spiral blade 5 and is formed slightly downward than the inclination from the top to the bottom of the spiral blade 5. The distal end 12 is positioned below the lower surface 5a of the spiral blade 5 at the fixed position, and the base end 11 of the crushing blade 10 is positioned above the upper surface 5b of the spiral blade 5 at the fixed position.

(3) Since the crushing blades 10 are arranged at the above-mentioned diameter positions by the spiral blades 5, if the crushing blades 10 are traced from the lower end 6 to the upper end 7 on the outer peripheral wall 8 of one spiral blade 5, each crushing blade 10. 10, gaps 14 and 14 are formed. This gap 14 is the smallest lowermost gap L ₁ (between the crushing blade at the diameter D ₀ position and the crushing blade 10 at the diameter D ₁ position), and this gap L ₁ is at least the end plate of the hollow concrete pile to be crushed. preferably it is formed larger than the width _{L 0} of (1, Figure 3 (b)). The interval L ₁ is intended for hollow concrete piles with a crushing blade at the D ₁ position having an outer diameter of 750 mm or less.
Interval L ₁ = 100mm
(Fig. 1).

(4) Also, crushing blades 10, 10 from the axis 2b of the head main body 1, in the radial direction _{Y 11} corresponding to the diameter _{D 3} or diameter _{D 0,} the two crushing blades 10, 10 are arranged vertically, radial Y ₁₁ symmetrical to the other side of the radial direction Y ₁₂ even in the vertical as well two crushing blades 10, 10 are arranged. Further, two crushing blades 10 and 10 are arranged above and below in the radial direction Y ₂₁ corresponding to the diameter D ₄ or the diameter D ₁ , and similarly in the radial direction Y ₂₂ on the other side symmetrical to the radial direction Y _21. The two crushing blades 10 and 10 are arranged in FIG. 3 (b).

Here, two crushing blades 10 and 10 are arranged vertically in the four radial directions Y ₁₁ , Y ₁₂ , Y ₂₁ , and Y ₂₂ from the axis 2b. It is preferable to arrange the crushing blades 10 and 10 in two at the top and bottom in at least two radial directions.

(5) As described above, the crushing head 1 of the present invention is configured (FIGS. 1A and 3B).

[2] Use of crushing head 1

(1) The removal head 20 that scrapes soil cement and mud filled in the hollow portion 33 of the hollow concrete pile 30 is attached to the lower connecting portion 4 of the crushing head 1. The removal head 20 has a structure having excavation blades 22 and 22 at the lower ends of the spiral blades 21 and 21 as in the case of an ordinary excavation head (FIG. 1).

(2) The hollow concrete pile 30 has end plates 35 and 35 on the top and bottom, and is usually configured by connecting the top and bottom of a plurality of unit piles with the end plates 35 and 35. The end plate 35 on the uppermost hollow concrete pile 30 is removed by a separate device (shown in FIG. 1 by a chain line).

(3) Subsequently, the crushing head 1 is connected to the lower end of a rotating rod 25 having a spiral 26 twisted in the same direction as the spiral blade 5, and is lowered while being rotated. The soil cement and mud accumulated in the hollow portion 33 are removed by the removal head 20 from above. While removing the soil cement or the like with the removal head 20, the pile wall of the hollow concrete pile 30 is broken from the upper side (upper inner wall side or upper end side) with the crushing blades 10 and 10 of the crushing head 1 above (FIG. )). At this time, the soil cement and mud soil collected in the hollow portion 33 and the crushed concrete pieces are sent upward by the spiral blades 21, 5 and spiral 26 and are transported to the ground.
At this time, when there is a PC steel bar, a spiral reinforcing bar or other reinforcing bars (hereinafter referred to as “rebars”) of the hollow concrete pile 30, the hollow concrete pile 30 can be wound around the base end 11 of the crushing blade 10 of the spiral blades 5 and 5. It is possible to continue crushing the hollow concrete pile 30 with the tips 11 of the other crushing blades 10 and 10. When the number of reinforcing bars entangled to some extent increases, the crushing head 1 is once lifted to the ground, the reinforcing bars are removed, the removal device is lowered again, and crushing is performed in the same manner.

(4) Subsequently, when there are end plates 35 and 35 in the middle (when there is a joint portion of the connecting pile), depending on the inner diameter of the hollow concrete pile 30, the crushing head 1 is shaken by shaking the rotating rod 25. If it is shaken in the lateral direction, the lower end, the second crushing blades 10, 10 can pass through the inside (hollow part) of the end plate 35 and the inner wall 31 below the end plate 35 of the hollow concrete pile 30 can be crushed. The lower inner wall 31 can be crushed while leaving the plate 35 (FIG. 2B).

(5) At this time, if the pile wall of the lower hollow concrete pile 30 can be crushed, the remaining end plate 35 is separated and is attached to the proximal end 11 of the crushing blades 10 and 10 of the spiral blades 5 and 5. The lower pile wall can be crushed with another crushing blade 10 in a state of being hooked and locked (FIG. 2 (c)).
When the crushing of all the hollow concrete piles 30 or the necessary crushing is completed, the crushing head 1 is lifted to the ground.

[3] Other embodiments

(1) In the above embodiment, the turning angle of the spiral blade 5 of the crushing head 1 is about 315 degrees. However, in the case of two spiral blades 5, 5, the turning angle of one spiral blade 5 is 180 degrees or more. Is preferable. If it is 180 degree | times or more, since the two crushing blades 10 and 10 can always be located in an up-down direction, crushing efficiency can be improved.
Moreover, even if the turning angle of one spiral blade 5 is less than 180 degrees, three or more spiral blades 5 are provided, or the spiral blades 5 are arranged on the upper and lower sides, and the other is disposed above the crushing blade 10 in a substantially vertical direction. The crushing blade 10 can also be formed (not shown).

(2) In the above embodiment, the lower connecting portion 4 is provided at the lower end of the head main body 2, but it can be omitted (FIG. 4). In this case, if the solidified cement milk in the hollow portion 33 of the hollow concrete pile 30 is scraped in advance by another means (or if there is no solidified cement milk in the hollow portion 33 from the beginning), the crushing function is dedicated. Therefore, crushing efficiency can be increased.

It is a side view of the Example of this invention. (A)-(c) is the schematic longitudinal cross-sectional view explaining the crushing using this invention. In the embodiment of the present invention, (a) is a front view and (b) is a bottom view. It is a side view of the other Example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Crushing head 2 Head main body 2a Head main body side 2b Head main body axis | shaft 3 Upper connection part 4 Lower connection part 5 Spiral blade 6 Spiral blade lower end 7 Spiral blade upper end 8 Spiral blade outer wall 10 Crushing blade 11 Crushing blade Proximal end 12 Tip of crushing blade 14 Gap between crushing blades 20 Removal head 21 Spiral blade of removal head 22 Excavation blade 25 of removal head Rotating rod 30 Hollow concrete pile 31 Inner wall 32 of hollow concrete pile External wall 33 of hollow concrete pile Pile hollow 35 End plate of hollow concrete pile

Claims (3)

A crushing head for a hollow concrete pile characterized by the following configuration.
(1) A spiral blade is disposed on a head body having a connecting portion with a rotating rod.
(2) The spiral blade was formed so that the radius gradually increased from the lower end toward the upper end, and the lower end radius was formed smaller than the inner diameter of the hollow concrete pile to be crushed.
(3) A plurality of crushing blades are fixed to the outer peripheral wall of the spiral blade at a predetermined interval, the cutting edge of the crushing blade is positioned downward from the lower surface of the spiral blade at the mounting position, and the base end of the crushing blade Was positioned upward from the upper surface of the spiral blade at the mounting position.
(4) Each of the spiral blades is “at least two spiral blades are arranged out of phase and formed in a range of at least 180 degrees around the axis of the head body.” Form so that a plurality of crushing blades are positioned vertically in the radial direction from the shaft. " The hollow concrete pile crushing apparatus according to claim 1, wherein a gap between the crushing blades is formed larger than a width of a ring-shaped end plate of the hollow concrete pile to be crushed. The hollow concrete pile crushing apparatus according to claim 1, wherein a removal head capable of removing a solidified material in a hollow portion of a hollow concrete pile to be crushed is attached to a lower end of the head body.

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