JPH07331892A - Plunge cutter and cutting method - Google Patents

Abstract

PURPOSE:To make compact a plunge cutter and to make it possible to deepen a cut by only lengthening a plunge pipe by providing anchoring device for anchoring a slide block and the plunge pipe in a detachable manner. CONSTITUTION:A horizontal and circular hole 7 guiding a plunge cutter main body 1 is bored in the side of a concrete structure 6 by means of a core drill. After that, a fixed base 11 of a plunge cutter fixing a plunge pipe 3 to the plunge cutter main body 1 with an embracingly tightening metal fixture 14 is so positioned to fix that the plunge cutter main body 1 is fitted to the circular hole 7. Then, a motor in the plunge cutter main body is started to revolve and drive a blade 5, a handle 13 is turned and operated to bring the blade 5 into contact with the side of the concrete structure 6, and cutting is started. In the case the cutting is continued to processed until a slide block 2 reaches the end of a slide pole, a nut 15 is loosened once, and the slide block 2 is retreated to the original position and is fixed again. In addition, the handle 13 is turned and operated to make the cutting until the slide block 2 reaches the end of the slide pole again.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to the cutting of concrete structures such as reinforced concrete and the cutting of stone materials (hereinafter referred to as
It simply refers to the cutting of concrete structures, but this also includes cutting out of stone materials, etc.), especially plunge cutters suitable for horizontally cutting concrete structures, and concrete structures using the plunge cutters The method of cutting things.

[0002]

2. Description of the Related Art Methods for cutting concrete structures include
A method of cutting using water pressure with a water jet, a method of spraying with a flame jet, a method of circulating diamond wire through a reinforced concrete structure for cutting, and a method of continuously drilling holes with a core drill However, among them, the water jet cutting method has inferior cutting ability, requires large mechanical equipment, and has the drawback that the cutting surface spreads radially, and the flame jet cutting method is dangerous. In addition to the above, there is a problem that the cut surface spreads radially like the cutting by the water jet.

Cutting with a diamond wire is superior to the former in cutting ability, but the wire saw is easily broken during cutting, and there is a risk of interruption of work due to breakage and danger to the operator due to jumping of the wire saw. In addition, large mechanical equipment is required, which causes a cost increase. Also,
The method of continuously drilling holes with a core drill does not require large mechanical equipment, but since many holes must be drilled continuously, it takes a considerable amount of time for cutting and the processing cost becomes high. There are difficulties.

In addition to the method of cutting a concrete structure, as shown in FIG. 1, a slide pole 1 made of a prism and a slide pole 1 slidably mounted on the slide pole 1,
The slide block 2 sent along the slide pole 1 by the pinion rack mechanism, the plunge pipe 3 fixedly supported by the slide block 2, the plunge cutter body 4 attached to the end of the plunge pipe, and the plunge cutter body 4 built-in Using a plunge cutter consisting of a circular saw-shaped blade 5 driven to rotate by a motor, a circular hole 7 is formed in a concrete structure 6 by a core drill or the like, and then the blade is rotated using the circular hole 7 as a guide hole. A method of cutting 5 is known.

[0005]

The method of cutting a blade of a plunge cutter with a circular hole formed by a core drill or the like as a guide hole has an advantage that cutting time can be shortened and processing cost can be reduced. When cutting with a large depth of cut, it is necessary to use a large plunge cutter with long columns from the beginning, or add a plunge pipe during cutting. However, the former large plunge cutter is heavy and not easy to handle,
Further, as shown in FIG. 1, when horizontally cutting a concrete structure, the distance 1 to the plunge cutter body 1 is increased by the slide block 2, so that the plunge pipe 3 causes the blade 5 of the plunge cutter body 1 and further the plunge pipe. As a result, the blade 5 bends downward due to its own weight, and as a result, the blade 5 comes into contact with the concrete structure, and smooth cutting cannot be performed due to the frictional resistance.

Further, it is troublesome and troublesome to add the latter plunge pipe. It is an object of the present invention to solve the above problems and provide a compact plunge cutter that does not require additional plunge pipes and a method for cutting a concrete structure by the plunge cutter.

[0007]

A plunge cutter according to the present invention comprises a slide pole projecting from a fixed base, a slide block slidably mounted on the slide pole and fed along the slide pole by a pinion rack mechanism, and a slide block. Plunge pipe fixed to
The plunge cutter body attached to the end of the plunge pipe, and the plunge cutter that is pivotally supported by the plunge cutter body and is driven by the motor built into the plunge cutter body to rotate the slide block and the plunge pipe. The method of cutting a concrete structure using this plunge cutter is characterized in that the plunge pipe near the main body of the plunge cutter is fastened with a slide block, and the slide is supported horizontally. After making a certain amount of incision horizontally in the concrete structure by the blade that is driven to rotate by a certain amount along the pole and is driven to rotate, the fastening by the fastening means is released and the slide block is retracted along the slide pole, After changing the fastening position and fastening, repeat the forward movement along the slide pole. And wherein the Succoth.

[0008]

By changing the fastening position to the plunge pipe and repeating the forward movement, the amount of forward movement of the slide block can be reduced and the length of the slide pole can be shortened. In addition, as shown in FIG.
The deflection at the blade 5 at the end of the plunge pipe 3 supported in a cantilever shape by the sliding block 2 and the blade 5 is
Since it is proportional to the cube of the length l (l ³ ) between and, the plunge pipe near the plunge cutter body 5 is fastened, and when l is small, there is almost no bending of the blade 5, and thus the concrete structure is There is little or no frictional resistance due to the contact. Also, rather than changing the position of attachment to the plunge pipe drastically in a single operation, it is better to change it in small increments and to gradually change the deflection, which reduces the total friction resistance with the concrete structure. Less power.

Examples of the fastening means used in the present invention include fixing by screwing, fastening of a hugging metal fitting with a screw, and connection by pulling out and inserting a pin. It becomes possible to automate using air cylinders and solenoids.

[0010]

EXAMPLE A rack 12 is attached to one side of a prismatic slide pole 1 which is erected from a fixed base 11.
The slide block 2 slidably mounted on the slide pole by the roller rolling the slide pole 1,
It has a pinion (not shown) that meshes with the rack 12,
When the pinion is rotated by the turning operation of the handle 13, the slide block 2 moves up and down along the slide pole 1 and is not shown in the transmission mechanism for transmitting the turning of the handle 13 to the pinion. A non-contact type electromagnetic clutch is provided so that transmission can be interrupted.

The slide block 2 has a plunge cutter main body 1 at its lower end, and a hugging metal fitting 14 for hugging and fixing a prismatic plunge pipe 3 having a blade 5 pivotally mounted on the main body 1, and a nut 15. The mounting position on the plunge pipe 3 can be changed by screwing it in or loosening it. Reference numeral 16 shown in FIG. 2 is a cover whose lower end is attached to the fixed base 11 and whose upper end is attached to the plunge pipe 3.

The plunge cutter of this embodiment is constructed as described above. Next, horizontal cutting of the concrete structure 6 by this plunge cutter will be described with reference to FIGS. First, a horizontal circular hole 7 for guiding the plunge cutter body 1 is formed on the side surface of the concrete structure 6 by using a core drill. Next, on the side surface of the concrete structure 6 adjacent to the circular hole 7, the plunge cutter main body 1 fixedly holds the plunge cutter fixed base 11 in which the plunge pipe 3 is hugged and fixed at a location adjacent to the plunge cutter main body 1 by the clasp metal fitting 14. It is positioned and fixed so that it fits with the circular hole 7 (FIG. 4).

After setting as described above, the motor in the plunge cutter body is started to rotate and drive the blade 5, and the handle 13 is rotated to bring the blade 5 into contact with the side surface of the concrete structure 6 to make a cut. Start. When the notch progresses until the slide block 2 reaches the end of the slide pole (Fig. 5), the nut 15 is loosened once to release the fixation of the hugging bracket 14 to the plunge pipe 3, and the slide block 2 is retracted to its original position. And fix it again (Fig. 6). During this time, the blade 5 is safe,
The rotation should be stopped, but the rotation may be continued.

Next, the handle 13 is rotated to make a cut again until the slide block 2 reaches the end of the slide pole (FIG. 7).

[0015]

According to the plunge cutter of the present invention, the position where the slide block is fastened to the plunge pipe can be changed, so that the plunge pipe can be extended while changing the position where the plunge pipe is fastened. Therefore, the stroke of the slide block and the length of the slide pole can be shortened to make the plunge cutter small and compact, and even if the plunge cutter is small and compact, only the plunge pipe must be lengthened. You can also make deeper cuts.

Further, when the plunge cutter of the present invention is used for horizontal cutting, a portion close to the blade is initially fixed and the blade is cut, so that bending of the blade is reduced and, as a result, contact between the blade and the concrete structure is achieved. The frictional resistance due to is also small, smooth rotation can be obtained, and the power required for cutting can be reduced. Further, if the work to repeat the forward movement is performed a plurality of times by changing the fastening position to the plunge pipe stepwise, it is possible to reduce the power required for cutting rather than to change the fastening position largely once. .

[Brief description of drawings]

FIG. 1 is a diagram showing a case where horizontal cutting is performed with a plunge cutter.

FIG. 2 is a side view of the plunge cutter according to the present invention.

FIG. 3 is a perspective view of a main part of the plunge cutter.

FIG. 4 is a view showing a state in which the plunge cutter is fixed for horizontal cutting.

FIG. 5 is a diagram showing when the slide block reaches the forward end.

FIG. 6 is a view showing a case in which the fastening position to the plunge pipe is changed and the plunge pipe is retracted.

FIG. 7 is a diagram showing when the slide block reaches the forward end.

[Explanation of symbols]

1 ... Slide pole 2 ... Slide block 3 ... Plunge pipe 4 ... Plunge cutter body 5 ... Blade 6 ... Concrete structure 7 ... Circular hole 14 ... Hugging hardware 15 ... Nut 16 ... Cover

Claims (3)

[Claims] 1. A slide pole projecting from a fixed base, a slide block slidably mounted on the slide pole and fed along the slide pole by a pinion rack mechanism, and a plunge pipe fixed to the slide block. , The plunge cutter body attached to the end of the plunge pipe, and pivotally supported by the plunge cutter body,
A plunge cutter comprising a plunge cutter body and a blade which is rotationally driven by a built-in motor, wherein plunge cutters are provided with fastening means for detachably fastening a slide block and a plunge pipe. 2. The method of horizontal cutting using the plunge cutter according to claim 1, wherein a plunge pipe near the main body of the plunge cutter is fixed by a slide block, and a fixed amount is advanced along a horizontally supported slide pole. After making a certain amount of incision horizontally in the concrete structure with the blade driven to rotate, the fastening by the fastening means is released and the slide block is retracted along the slide pole, changing the fastening position and stopping. After wearing, the cutting method is characterized by repeating the forward movement along the slide pole. 3. The cutting method according to claim 2, wherein the operation of changing the fastening position to the plunge pipe and repeating the forward movement is performed a plurality of times.