JP2001081975A - Method for peeling mortar on surface of concrete and concrete cutter therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To tear down entirely the mortar laminated on the surface of a skeleton of concrete, with little noise and in a short term of work. SOLUTION: A disk-shaped concrete cutter 3 held on the rotational axis L is brought onto a mortar finished surface formed by laminating mortar 2 in a prescribed thickness on the surface of a skeleton of concrete. With the rotational axis L held orthogonal to the surface of the skeleton of concrete, the concrete cutter 3 is inserted into the part of the boundary between the skeleton of concrete and the mortar 2 and moved in parallel to the surface of the skeleton. Thereby the mortar 2 is cut and separated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mortar peeling method for a concrete surface layer used for finishing and repairing a concrete building or increasing the thickness of a wall for seismic reinforcement and a concrete cutter therefor.

[0002]

2. Description of the Related Art In a concrete building, finishing is performed by applying mortar to the surface of a reinforced concrete frame with a gold trowel, but repair work after finishing the aging and seismic reinforcement work by increasing the thickness of a wall are required. When this occurs, the mortar laminated on the surface of the concrete skeleton is peeled off prior to a new finish coating or thickening of the skeleton.

Conventionally, in this mortar peeling operation, a small rock drill-like heavy machine called a “chipper” is used, or an operator directly performs a filing operation using a hammer drill to disassemble the mortar layer. Was.

[0004]

However, the above-mentioned chipping machines such as "chippers" or hammer drills,
Since the mortar surface is broken by sending compressed air by a compressor and applying vibration and impact to the mortar surface, there have been problems such as a loud impact sound and extremely poor work efficiency. In particular, if the building to be constructed is a business that is open 24 hours a day or is a hospital where quietness is required, the working hours are greatly restricted due to noise, so the construction period is prolonged. And other problems had occurred.

Further, in the case of these impact / vibration type filers, since the impact and vibration are transmitted to the skeleton, damage such as cracks may be induced in the skeleton.
In addition, especially in the seismic retrofitting work, it is necessary to completely remove the mortar of which strength is not expected and expose the concrete surface, but it takes too much time to disassemble the mortar neatly with the above-mentioned razor that sharpens in a point. There was a problem.

Further, in the case of these cutting devices,
The work environment deteriorates due to the generation of dust, and the dismantled mortar becomes fine crushed pieces.

SUMMARY OF THE INVENTION Accordingly, it is a main object of the present invention to provide a concrete surface mortar peeling method and a concrete cutter therefor, which make it possible to cleanly disassemble mortar laminated on the surface of a concrete skeleton in a short period of time with low noise. It is in.

[0008]

In order to solve the above-mentioned problems, a method of peeling mortar from a concrete surface is described in which a mortar-finished surface in which mortar is laminated with a predetermined thickness on the surface of a concrete body is held on a rotating shaft. Bring a disk-shaped concrete cutter, hold the rotation axis perpendicular to the concrete skeleton surface, insert the concrete cutter at the boundary between the concrete skeleton and the mortar, and move the concrete cutter to the concrete skeleton surface. The mortar is cut and separated by moving in parallel.

On the other hand, a first concrete cutter for the mortar peeling method for concrete surface comprises fixing one or a plurality of wedge-shaped chip pieces on a peripheral surface of a rotary head holding the concrete cutter, and paralleling the concrete cutter. In accordance with the movement, the mortar slices after cutting are divided by the wedge-shaped chip pieces. Further, the second concrete cutter is formed on an inclined surface of the cutter substrate surface, and cuts the mortar flakes after cutting by the inclined surface with the parallel movement of the concrete cutter. .
In these cases, it is desirable that the cutting segment fixed to the peripheral edge of the concrete cutter be eccentrically fixed to the concrete skeleton side from the center of the thickness of the concrete cutter substrate.

[0010] Further, the rotating head includes a head body,
It consists of a boss formed on the outer surface of this head body,
The boss portion is fitted into a fitting hole formed at the center of the concrete cutter, and has a structure in which the boss portion is fixed with screws from the back surface, and a first portion formed along a height direction on a peripheral surface of the boss portion. Around the circumference of the rotary head, a cooling water supply groove formed of a groove formed in the radial direction on the head body surface which is a continuous contact surface with the concrete cutter from the first groove. It is preferable that one or a plurality of the cooling water supply grooves are formed, and cooling water can be supplied to these cooling water supply grooves through the inside of the rotary head.

[0011]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a perspective view showing a mortar peeling procedure of a concrete surface according to the present invention, and FIG. 2 is a sectional view thereof.

In the present invention, in order to remove the mortar 2 from the wall surface on which the mortar 2 is laminated at a predetermined thickness on the surface of the concrete skeleton 1, the disc-shaped concrete cutter 3 held on the rotation axis L is used. Brought in, mortar 2
Is separated from the concrete frame 1 by cutting. That is, the rotation axis L is set to the concrete frame 1
The concrete cutter 3 is inserted into the boundary between the concrete skeleton 1 and the mortar 2 while holding the concrete cutter 3 at right angles to the surface of the concrete skeleton.
The mortar 2 is cut and separated by moving in parallel to the surface.

As shown in FIG. 3, the concrete cutter 3 has a fitting hole 4a for fitting a boss 6a of the rotary head 6 at the center of the cutter substrate 4, and the fitting hole 4a. A plurality of mounting screw holes 4b, 4b... Are formed at predetermined angular intervals around the outer periphery of the hole 4a, and a cutting segment 5 made of cemented carbide capable of cutting mortars along the periphery of the cutter substrate 4. Is a disk-shaped cutter having a structure fixed by brazing welding. In the present embodiment, the cutting segments 5 are provided continuously along the periphery, but may be provided intermittently at predetermined intervals. In recent years, in order to suppress the vibration and generated sound of the substrate, a substrate having a deformed slit or groove pattern formed by a laser on the substrate surface has been provided, but the mortar is moved along the surface of the concrete frame 8 to move the mortar. In order to cut and remove accurately, it is necessary to make the cutter substrate itself have high rigidity and suppress the deformation (warp) of the substrate. It is desirable to use a so-called sandwich panel type cutter plate in which steel plates for a substrate are laminated on both sides with a steel sheet interposed therebetween. By using this sandwich panel type cutter plate, noise can be reduced by about 40% as compared with a case where a cutter substrate made of a steel material is simply used.

Further, regarding the diameter of the cutter substrate 4,
If the diameter is large, the peripheral speed increases even if the angular velocity is the same, so the cutting efficiency is improved, but on the other hand, the deformation due to the warpage increases, so that the boundary surface between the concrete skeleton 1 and the mortar 2 cannot be cut cleanly. Problems arise. Therefore, it is necessary to determine the diameter of the cutter substrate 4 in consideration of the capacity of the electric motor, the actuator, and the like to be used for these two reciprocal factors.
According to experiments by the present inventors, it is found that the cutter substrate 4 having a diameter of 400 to 250 mm has a good balance between the two.

As shown in FIG. 3, a boss 6a formed on the outer surface of the rotary head 6B is fitted into the fitting hole 4a for mounting the concrete cutter 3, and the mounting screw is
, 4b,... and screwed into screw holes 6b, 6b. By adopting such a mounting structure, the concrete cutter 3 can be fixed to the rotary head 6 without projecting a projection on a surface (hereinafter referred to as an outer surface) of the concrete cutter 3 on the side of the concrete frame.

When the concrete cutter 3 is moved in parallel along the surface of the concrete skeleton 1 to cut and remove the two layers of mortar laminated on the surface of the concrete skeleton 1 in a slice shape, a rotary shaft (rotating head 6) is used. ) Collides with the mortar flakes 2a during the movement process and hinders the operation. Therefore, in order to enable the concrete cutter 3 to move, the mortar flakes 2a after cutting are removed at least along the moving line of the rotary head 6. It is necessary. Therefore, in the present invention, one or a plurality of, in this example, a pair of wedge-shaped chip pieces 7, 7 are fixed to the peripheral surface of the rotary head 6, and the mortar thin piece 2a after cutting is cut along with the parallel movement of the concrete cutter 3. Is divided by the wedge-shaped chip pieces 7.

As shown in FIGS. 9 and 10 at the beginning of the development, the present inventors fixed a cutting segment 50 on the peripheral surface of the rotary head 6 in the same manner as the cutter substrate 4 and fixed the rotary head 6 in the course of operation. We considered that the same cutting would be performed for the 6 parts, but the cutting by the rotating head 6 part would not be possible because the necessary peripheral speed was not secured, and the cutting sound was large because the cutting part was open. In addition, it became clear that the mortar shavings became dust and soared, so that the working environment deteriorated.

As described above, if one or a plurality of wedge-shaped chip pieces 7, 7 are fixed to the peripheral surface of the rotary head 6, FIG.
As shown in the figure, in the process of moving the concrete cutter 3, the tip of the wedge-shaped chip 7 sinks into the lower side of the mortar thin piece 2a cut into slices and separated from the concrete skeleton 1. The mortar flakes 2a are raised outward along the inclined surface 7a and are sequentially divided. As compared with the case where the same cutting is performed in the rotary head 6 described above, the noise is reduced, the load on the rotary drive source is reduced, and the mortar slices 2a, 2a,. As a result, the mortar shards can be easily collected because they fall down to the floor side.

If the inclination angle θ of the inclined surface 7a of the wedge-shaped chip piece 7 is too high, the collision sound and the resistance increase if the inclination angle θ is too high. In order to be able to divide it without any problem, it is preferable that the inclination angle θ is approximately 15 to 40 °.

On the other hand, when the mortar 2 laminated on the surface of the concrete skeleton 1 is cut into slices, as shown in FIG. In addition to the tendency to warp, it was found that the generation of frictional heat was larger than expected due to the close contact or frequent contact between the outer surface of the cutter substrate 4 and the concrete skeleton 1. This 2
In the present invention One of the problems to solve at a stroke, as shown in FIG. 6, to secure the thickness center S ₂ of the cutting segments 5 by decentering from the thickness center S ₁ of the cutter substrate 4 in the concrete skeleton 1 side Like that. As a result, the inner surface of the cutter substrate 4 (the surface exposed to the outside) comes into contact with the inner surface of the mortar flake 2a during rotation, or the contact is repeated frequently, so that the cutter substrate 4 is brought closer to the concrete skeleton 1 side. As a result, there is no escape to the mortar 2 side. The projection amount ΔS of the cutting segment 5 from the inner side surface of the cutter substrate 4 is approximately 1 to 2 mm.
It is better to be.

Further, a gap is formed between the cutter substrate 4 and the concrete skeleton 1 due to the eccentricity of the cutting segment 5, and the space between the cutter substrate 4 and the concrete skeleton 1 is formed by a cooling water supply structure described later. The cooling water supplied to the tank becomes easy to rotate, and the cooling effect can be enhanced.

As shown in FIG. 4, the cooling water supply structure for the concrete cutter 3 is such that a cooling water supply groove M is formed in the rotary head 6 so that the cooling water sent through the inside of the rotary head 6 is supplied to the cutter substrate 4. Is supplied to the outer side and the inner side. More specifically, as shown in FIG. 3, the rotary head 6 includes a head body 6B.
And a boss 6a formed on the outer surface of the head body 6B.
A first groove 6c is formed along the height direction on the peripheral surface of the boss portion 6a, and the first groove 6c is formed along the first groove 6c.
The cooling water supply groove M is formed by forming a second groove 6d in the radial direction on the surface of the head main body 6B, which is a contact surface with the concrete cutter 3 continuously from the groove 6c.
One or more cooling water supply grooves M are formed around the circumference of the rotary head 6, and eight cooling water supply grooves M are formed in the illustrated example. 8, cooling water can be supplied.

In the above example, wedge-shaped chips 7, 7 are fixed to the peripheral surface of the rotary head 6 to divide the mortar thin piece 2a. However, as shown in FIGS. An inclined surface 9 may be formed on the inner surface of the mortar 4, and the mortar flakes 2 a may be split by the wedge action of the inclined surface 9 as the concrete cutter 3 moves.

In order to disassemble the mortar 2 using the concrete cutter 3 described in detail above, the concrete skeleton 1
It must be moved parallel to the plane. Therefore, for example, as shown in FIG.
In addition to fixing to the concrete frame 1, a rail member 12 having a rack gear formed between the rail mounts 10, 10 is horizontally mounted, and a driving device 13 holding the concrete cutter 3 is mounted on the rail member 12. The driving device 13 has a rail fitting recess on the lower surface side for engaging with the rail member 12 and a pinion gear meshing with a rack gear of the rail member 12 so as to be movable along the rail member 12. , Can be moved at any speed along the rail member 12. The rail member 1
When the mortar peeling along the horizontal line is completed along the horizontal line 2, the rail mounts 10 and 10 are replaced, and the mortar peeling of the next upper line is sequentially performed.

[0025]

As described above in detail, according to the present invention, the mortar laminated on the surface of the concrete skeleton can be dismantled cleanly with low noise and in a short construction period.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a procedure for removing mortar from a concrete surface according to the present invention.

FIG. 2 is a sectional view thereof.

FIG. 3 is an exploded view of the rotary head 6 and the concrete cutter 3.

FIG. 4 is a sectional view showing a cooling water supply procedure.

FIG. 5 is a cross-sectional view illustrating a warped state of the cutter substrate 4 during mortar cutting.

FIG. 6 is an enlarged view of a main part showing how to attach the cutting segment 5 to the cutter substrate 4;

FIG. 7 is an overall sectional view showing a modification of the concrete cutter 3.

FIG. 8 is a perspective view showing a modification of the concrete cutter 3.

FIG. 9 is a perspective view showing an example of a concrete cutter.

FIG. 10 is a sectional view showing the mortar cutting state.

FIG. 11 is an overall side view showing a mortar disassembly operation procedure.

[Explanation of symbols]

1 concrete skeleton, 2 mortar, 2a mortar flake, 3 concrete cutter, 4 cutter board,
5: Cutting segment, 6: Rotating head, 7: Wedge-shaped chip piece, 9: Inclined surface

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Koji Mizutani 3-4, Kitayamadai, Togo-cho, Aichi-gun, Aichi Prefecture F term (in reference) 2E176 AA01 AA02 BB21 BB23 BB28 BB36 DD22 DD36 DD64

Claims (5)

[Claims] 1. A disk-shaped concrete cutter held on a rotating shaft is brought in for a mortar-finished surface in which mortar is laminated with a predetermined thickness on the surface of a concrete skeleton, and the rotating shaft is moved with respect to the concrete skeleton surface. It is characterized in that the mortar is held orthogonally, the concrete cutter is inserted into the boundary between the concrete skeleton and the mortar, and the mortar is cut and separated by moving the concrete cutter in parallel with the surface of the concrete skeleton. Mortar peeling method for concrete surface. 2. A concrete cutter for the mortar peeling method for concrete surface according to claim 1, wherein one or a plurality of wedge-shaped chip pieces are fixed on a peripheral surface of a rotary head holding the concrete cutter. A concrete cutter characterized in that the mortar flakes after cutting are divided by the wedge-shaped chip pieces with the parallel movement of the concrete cutter. 3. A concrete cutter for a mortar peeling method for a concrete surface according to claim 1, wherein the concrete cutter is formed on an inclined surface on a cutter substrate surface, and the concrete cutter is moved in parallel with the parallel movement of the concrete cutter. A concrete cutter characterized in that mortar flakes after cutting are divided by the inclined surface. 4. The concrete cutter according to claim 2, wherein a cutting segment fixed to a peripheral edge of the concrete cutter is eccentric to a concrete body side from a thickness center of the concrete cutter substrate. 5. The rotary head comprises a head body and a boss formed on an outer surface of the head body, and the boss is fitted into a fitting hole formed in the center of a concrete cutter. A first groove formed along the height direction on the peripheral surface of the boss portion, and the first groove forms a contact surface with the concrete cutter continuously from the first groove. One or a plurality of cooling water supply grooves formed of a second groove formed in the head body surface along the radial direction are formed around the circumference of the rotary head, and the cooling water supply grooves are formed through the inside of the rotary head. 5. The concrete cutter according to claim 2, wherein cooling water can be supplied.