JPH0542366Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial field of application This invention relates to a cutting device for making notches in the core test specimen of concrete structures.

Conventional technology A method of measuring the strength of the concrete structure itself by destructive testing of core test specimens in order to manage the construction and maintenance of concrete structures such as architectural structures and civil engineering structures to maintain them in good condition. It has been known. In particular, in such a measurement method,
A small concrete cutter with a rotating cutting blade at the tip is generally used to introduce a notch into a core specimen.

Problems that the device aims to solve However, the means of introducing notches into such concrete core specimens have problems such as poor work efficiency due to the processing being done in a narrow hole and inability to achieve satisfactory processing precision.

Therefore, the purpose of this invention is to support a rotating cutter so that it can move back and forth, left and right, and up and down, in order to solve these problems in the prior art.
It is an object of the present invention to provide a core specimen cutting device capable of providing a required notch in a core specimen using this rotating blade.

Means for Solving the Problems According to this invention, the core specimen cutting device includes a cylindrical support that supports an electric motor and is movable up and down, and a cylindrical support that supports the support so that it can move up and down, and a slider that supports the support in the back and forth direction. A possible first support base, a second support base that is slidable in the left and right directions that supports the first support base so as to be slidable in the front-rear direction, a fixed base that supports this second support base, and a motor shaft. A rotatable cutter is provided at the lower end of a shaft connected to the shaft, rotatably supported along the center of the support, and extending downward.

Accordingly, this invention uses the above-mentioned means to change the position of the rotating blade in the vertical direction using the cylindrical support, in the front-back direction using the first support, and horizontally and horizontally using the second support. Since they can be adjusted in the respective directions, the position of the notch, the depth of the notch and the width of the notch can be set as required.

Other objects, features and advantages of the invention will become apparent from the following detailed description taken in conjunction with the accompanying drawings.

Embodiment As shown in FIGS. 1 and 2 of the drawings, the core specimen cutting device of this invention includes a cylindrical support 12 that supports an electric motor 11 and is movable up and down, and this support 12.
A first support stand 14 that is movable in the front-rear direction and supports the first support stand 14 so as to be movable up and down, and a second support stand 15 that is movable in the left-right and lateral directions that supports the first support stand 14 so as to be movable in the front-rear direction. a fixed base 16 that supports the second support base 15; and a shaft 19 connected to the shaft 18 of the electric motor 11, rotatably supported along the center of the support body 12, and extending downward. It is equipped with a rotating cutter 17.

The electric motor 11 is of the type commonly used and is mounted on the upper end of a cylindrical support 12 with a shaft 18
is protruding downward. The support body 12 has a substantially cylindrical shape, has a flange portion 36 at the upper end, and has a hole 37 for the shaft 19 in the center. In the illustrated embodiment, the first support base 14 has a rectangular outer diameter and has a round hole 20 into which the support body 12 fits.
A support body 12 is fitted to be movable up and down, and a set screw 30 is provided to fix the support body 12 in a predetermined position in the vertical direction. A dovetail-shaped slider part 21 is provided at the lower end of the support base 14 to slidably support the first support base 14 in the front-rear direction (horizontal direction in FIG. 1). A slider section 22 is provided on the second support base 15. The second support stand 15, which supports the first support stand 14 so as to be slidable in the front-rear direction, also has a rectangular outer shape, and has a dovetail groove shape so that it can slide in the left-right and lateral directions (direction perpendicular to the plane of the paper in FIG. 1). A slider section 23 is provided, and this slider section 23
A slider section 24 corresponding to the above is provided on the fixed base 16. Therefore, the first support stand 14 extends from the second support stand 15 in the front-rear direction with respect to the second support stand 15.
5 is adapted to be able to slide in the left and right directions with respect to the fixed base 16, respectively. Also, these first and second
Feed screws 26 and 31 are provided to slide the support stands 14 and 15 in the front-rear direction and left-right lateral direction, respectively. The feed screw 26 has a knob 27 at one end, is rotatably supported by the second support base 15 by a support member 29, and is threadedly engaged with the female thread member 28 of the first support base 14. Similarly, the feed screw 31 has a knob 32 at one end, is rotatably supported on the fixed base 16 by a support member 34, and is threadedly engaged with a female screw member 33 of the second support base 15.

The shaft 19 is connected to the shaft 18 of the electric motor 11 by a suitable joint 41, and is rotatably supported in the hole 37 of the support body 12 by suitable bearings 42, 43, and the cutter 17 is attached to the lower end. ing.

In the core test specimen cutting device of this invention constructed in this way, first, a core test specimen 2 is formed on the concrete structure 1 to be tested, and an appropriate hole 3 is formed adjacent to this core specimen 2. It will be done. The core test piece cutting device of this invention is installed as shown in the figure to the core test piece 2 and hole 3 formed in the concrete structure 1 in this way, and the fixing table 16 is fixed with bolts, for example. and is fixed to the concrete structure 1. Next, the support 12 that supports the electric motor 11 is moved up and down with respect to the first support stand 14, and the support is moved so that the cutter 17 is located at the required position to provide the required notch 4 in the core test specimen 2. 12 in the vertical direction (Z direction in FIG. 1) and fix it with a set screw 30. Here, the electric motor 11 is activated to rotate the cutter 17, and then the feed screw 26 is rotated.
Turn the knob 27 to slide the first support base 14 in the front-rear direction (X direction in FIG. 2) via the feed screw 26 and female screw member 28 to cut out the notch 4 to the required depth, and The second support base 15 is moved in the left and right direction (Y direction in FIG. 2) via the knob 32 of the screw 31 and the feed screw 31 and the female screw member 33.
The notch 4 can be cut out to a desired width by sliding the notch 4 , thereby forming a predetermined notch 4 in the core test piece 2 .

Effects of the invention As described above, according to the core specimen cutting device of this invention, first, the position of the blade rotated by the electric motor is adjusted to support the electric motor, corresponding to the position of the notch to be formed in the core specimen. The support body is moved up and down to adjust it in the vertical direction (Z direction), and then the first and second supports are adjusted in the front and back direction (X direction) and left and right by adjusting the feed screws of the first and second supports. By sliding in the lateral direction (Y direction), notches of the required depth and width can be made accurately and reliably, and the position of the blade can be precisely adjusted in each of the X, Y, and Z directions. Therefore, the position, depth, and width of the notch can be freely and easily set. In addition, the core specimen cutting device of this invention has a simple structure, and therefore can be manufactured easily, simply, and at low cost. Furthermore, the core specimen cutting device of this invention can be used not only for concrete structures but also for
Notches can also be provided in core test specimens such as mortar and rocks. In addition, the bending strength, compressive strength, etc. measured by general strength testing methods are affected by the shape and dimensions of the test specimen, but by combining the core specimen cutting device of this invention and the break-off tester. As a result, it is possible to easily measure the fracture toughness value, which is a material characteristic value free from shape and size effects, on site.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of the core specimen cutting device of this invention, and FIG. 2 is a plan view. In the figure, 1... Concrete structure, 2... Core test piece, 3... Hole, 4... Notch, 11... Electric motor, 12... Support body, 14... First support base, 1
5... Second support stand, 16... Fixed stand, 17...
Knife, 18, 19...Shaft, 21, 22, 23, 2
4... Slider member, 26, 31... Feed screw, 27, 32... Knob, 28, 33... Female thread member, 42, 43... Bearing.

Claims (1)

[Scope of utility model registration request] A cylindrical support that supports the electric motor and can move up and down,
A first support base that is slidable in the front-rear direction and supports the support body in a vertically movable manner; a second support base that is slidable in the left-right and lateral directions that supports the first support base so as to be slidable in the front-rear direction; A fixed base that supports the second support base, and a rotating cutter provided at the lower end of the shaft that is connected to the motor shaft and rotatably supported along the center of the support and extends downward. A core specimen cutting device.