JPS63107514A - Concrete pile cutter - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) This invention is a method for cutting off the excess head of the portion of a concrete pile that remains above ground that is cast underground. Regarding equipment.

(Prior art) The methods of pile cutting that have been commonly used so far are as follows:
An electric cutter combined with a hydraulic pump is placed on a support frame wrapped around the pile, facing the centripetal direction of the pile, and the electric cutter is advanced in the centripetal direction to a predetermined depth for cutting (so-called ``direct cutting''). However, this method has the following drawbacks.

(a) Since the cutter moves in the centripetal direction of the pile, the load resistance against the blade is large due to the reinforcing bars and aggregates, and the impact damages the blade and causes the blade to spill due to heating. Note that if you force it in, it will burn out the motor and cause malfunction.

(mouth) As a result of (a), cracks and peeling phenomena tend to occur in the pile.

(c) It takes time and effort to move the electric cutter around the pile many times, and skill is required to move the electric cutter so that the cut parts do not overlap.

(d) Since a hydraulic mechanism must be provided separately, the equipment is troublesome and costs increase.

(e) Work efficiency is poor, and only a few pieces can be cut in -1 days standard working time.

(Problems to be Solved by the Invention) In view of the above-mentioned circumstances of the prior art, the present invention first changes the cutting direction to "one cross cutting" rather than "straight cutting", and also changes the pushing operation of the cutter to hydraulic pressure. shall be done manually,
Furthermore, by using an air motor capable of changing the load speed as the drive source of the cutter, the above-mentioned difficulties can be overcome, and a cutting device with a simplified structure can be provided.

[Structure of the Invention] (Example) The following description will be made by referring to the embodiments shown in the drawings. FIG. 1 shows the overall structure of the apparatus.

That is, as shown in the figure, the device of the present invention has a pile holding ring 1.
It is composed of three elements: a rotary support base that slides around the rotary support base, and a rotary cutting machine 5 that is fixed to the rotary support base.

First, the holding ring l consists of a combination of semicircular shapes 1a and lb, and its outer circumference is formed on the guide rail 2, and the outer circumferential wall faces the inner circumferential wall at a predetermined angular interval.
It is a screw insert.

Next, the rotary support base 3 is mounted on the guide rail 2 via rollers 4, and can freely slide 360 degrees along the guide rail 2.

Finally, the rotary cutting machine 5 is attached to the rotary support base 3 by a mounting base 6.
In particular, an air motor M is provided as the drive source, and the rotary cutting blade 7, together with its mounting case 8, can be rotated at any angle with respect to the mounting base 6. . Reference numeral 9 denotes an adjuster with a conversion port 119a attached to the mounting case 8 in order to set the turning angle, thereby making the cutting depth by the cutting blade 7 constant.

Note that lO is the fountain pipe 1 facing directly above the rotary cutting blade 7.
0 to prevent cutting chips from scattering.

In the drawing, 12 is a handle provided integrally with the mounting case 8.

(Function) In order to cut a pile using the apparatus of the present invention having the above-mentioned configuration, the holding ring 1 is first tightened and fixed at a desired position on the pile P.

At this time, it goes without saying that the tightening bolt ll must be adjusted depending on the outer diameter of the pile.Moreover, the rotary support stand 3 is mounted on the guide rail 2 on the outer circumferential side of the extension ring 1, and finally the rotary cutter 5 to its rotating support base 3 (see Figures 1 and 2).
figure).

Then, the air motor is started (rotated at high speed) and the cock 13 of the fountain pipe 10 is operated to spray the air toward the cutting blade 7.

Then, the worker grasps the handle, rotates the mounting case 8 inward, that is, toward the outer wall of the pile, and presses the cutting blade 7 against the outer wall.

Once the cut has been made to a predetermined depth, the turning angle is read by the adjuster 9 with a conversion scale 9a, and the screw is tightened at that position with the bolt 9b.

That is, as a result, a cutting width of a constant depth can always be obtained for piles having the same outer diameter.

Next, when the handle 12 is pushed or pulled in the rotational direction from that position, the rotary support base 3 slides on the guide rail 2, so the cutting blade 7 gradually moves in the circumferential direction while receiving load resistance due to the cut. The cutting to a predetermined depth progresses, and the turning cutting is completed exactly at the 360 degree position of this turning operation.

If the thickness of the pile is large, the cutting width is set to 3 to 3 times, and the turning operation is performed 3 to 3 times (Figure 3).

Figure 4 shows the state of the pile after the cutting has been completed, with the pile head slightly connected to the pile body at the uncut portion on the inside.

Then, as shown in the figure, the cutting operation is completed by hitting the side of the pile head with a hammer directly or through a wedge.

[Effects of the Invention] As described above, the present invention is capable of minimizing load resistance and impact because the cutting blade cuts in the circumferential direction of the pile instead of in the centripetal direction, and can be driven at high speed by an air motor. During rotation, the speed can be changed automatically according to the load resistance due to reinforcing bars and aggregates, and there is no problem such as damage to the blade or overheating of the motor. This eliminates concerns about cracks and peeling of the pile. The turning operation of the cutting blade is also made to slide on the guide rail via rollers, so it can be smoothly moved by simply pushing it lightly in the cutting direction.

As a result, work efficiency was significantly improved, and it became possible to cut approximately 50 pieces in a standard working time of -1 day.

It has a significantly simplified structure, is not only economical, but also extremely easy to handle.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention HB, in which Fig. 1 is a perspective view, Fig. 2 is a longitudinal cross-sectional side view taken along the line A-A in Fig. 1, Fig. 3 is a plan view in use, and Fig. 4 is a cutaway view. A longitudinal side view of the state where the head of the counter is knocked off with a hammer after completion. 1--Holding ring, 2--Guide rail, 3--One-turn cutting machine, 4-m-roller, 5--One-turn cutting machine, 6--
Mounting base, M-m-air motor, 7--rotating cutting blade, 8-m-installation case, 9a--conversion scale, 9-m-
Adjuster with conversion scale, 10-m-fountain pipe, 11-m-tightening bolt, 12-m-handle.

Claims (1)

[Scope of Claims] 1) A holding ring 1 whose outer circumferential side is formed on a guide rail 2, a rotary support 3 mounted on the guide rail 2 via rollers 4, and a mounting base on the rotary support 3. In particular, the rotary cutting machine 5 is equipped with an air motor M as a drive source, and the rotary cutting blade 7 is rotated with respect to the mounting base 6 together with its mounting case 8. A concrete pile cutting device characterized by being able to be set automatically. 2) The concrete pile cutting device according to claim 1, wherein the mounting case 8 of the rotary cutting machine 5 is attached with an adjuster 9 with a conversion scale 9a for setting the turning angle of the rotary cutting blade 7. 3) The concrete pile cutting device according to claim 1 or 2, wherein the rotary cutting machine 5 is provided with a fountain pipe 10 facing directly above the rotary cutting blade 7. 4) The concrete pile cutting device according to claims 1 to 3, wherein the tightening bolts 11 are screwed into the holding ring 1 so as to face the inner wall from the outer wall at predetermined angular intervals.