JP5945887B2 - How to collect concrete cores - Google Patents

Description

The present invention relates to a method for collecting a concrete core .

  Conventionally, for example, when evaluating the properties and soundness of existing concrete structures, or when providing holes in concrete structures, a core drill (concrete core sampling device) is used to rotate a substantially cylindrical core bit around its axis. Then, a cutting blade provided at the tip is cut into the concrete structure, and a cylindrical concrete core is collected (see, for example, Patent Document 1).

  In general, the core drill is supported by a base fixed to the surface of the concrete structure, a support column integrally connected to one end of the base, detachably attached to the support column, and freely movable along the support column. And a core bit that is detachably connected to a rotation shaft of the rotation drive motor. Then, for example, a concrete anchor is placed at a predetermined position of the concrete structure, and the base is fixed to the surface of the concrete structure by fixing with screws and nuts to the concrete anchor. In addition, a rotary drive motor and a core bit are disposed.

Japanese Patent Laid-Open No. 11-320548

  However, in the above-described conventional concrete core collecting device (core drill), it is necessary to pull out the core bit cut into the deep part of the concrete structure from the cutting groove and insert chisel into the cutting groove to fold the concrete core. turn into. In other words, it is necessary to separate the concrete core using a tool other than the core bit such as chisel, so that the concrete core can be efficiently collected using only the concrete core collecting device. Was strongly desired.

In view of the above circumstances, without using a separate member such as a chisel, and an object thereof is to provide a sampling method of co Nkuritokoa can be collected concrete core.

  In order to achieve the above object, the present invention provides the following means.

The method for collecting a concrete core according to the present invention includes a support column, a rotary drive motor supported so as to be able to advance and retreat along the support column, and an axis line arranged coaxially so that a rear end side can be attached to and detached from the rotary shaft of the rotary drive motor A cylindrical concrete core from a concrete structure using a concrete core collecting device provided with a core bit connected to the core bit , wherein the core bit has a cutting edge at a tip and has a diameter. A plurality of different substantially cylindrical bit portions, the bit portions in which the cutting edges of the bit portions are sequentially arranged radially outward so that their axes are coaxially arranged, and radially inward Are formed so as to be integrally arranged so as to be arranged on the rear end side in the axial direction with respect to the cutting edge of the plurality of cutting blades, and a plurality of cutting blades are arranged in a multistage shape, and the core bit is rotated around the axial line. Proceed along the column Cutting the plurality of cutting blades arranged in a multi-stage shape of the core bit sequentially to a predetermined deep position of the concrete structure to form a multi-stage cutting groove and a cylindrical concrete core; The core bit is tilted by pulling up and tilting the core bit in the multi-stage cutting groove, and contacting the inner surface of the core bit with the tip side of the concrete core and the cutting edge at the tip of the core bit with the side surface of the concrete core. And applying an external force from the core bit to the concrete core with a force point at a tip portion of the concrete core with which the inner surface of the core bit abuts and a side portion of the concrete core with which the cutting edge of the core bit abuts as a fulcrum. The core is folded and separated at the base end side connected to the concrete structure. Characterized in that it includes a cleat core separation step.

Further, the concrete core collecting method of the present invention includes a support, a rotation drive motor supported so as to be able to advance and retreat along the support, an axis line coaxially, and a rear end side of the rotation shaft of the rotation drive motor. A method of collecting a columnar concrete core from a concrete structure using a concrete core collecting device provided with a core bit detachably connected , the core bit having a cutting edge at a tip thereof, The plurality of substantially cylindrical bit portions having different diameters are arranged such that their axis lines are coaxially arranged, and the cutting edges of the bit portions sequentially arranged radially outward are arranged radially inward. A plurality of cutting blades are arranged in multiple stages so as to be arranged closer to the rear end side in the axial direction than the cutting edge of the bit portion, and the core bit is rotated around the axis. Along the strut Cutting to form a multi-stage cutting groove and a cylindrical concrete core by sequentially cutting the plurality of cutting blades arranged in a multi-stage shape of the core bit to a predetermined deep position of the concrete structure. A step of pulling up and tilting the core bit in the multi-stage cutting groove to bring the cutting edge at the tip of the core bit into contact with the side surface of the concrete core, and rotating the core bit around an axis, A notch portion forming step of forming a notch portion formed by cutting with the cutting edge on the side surface of the core bit, and by inclining the core bit to bring the inner surface of the core bit into contact with the tip side of the concrete core from the core bit. Applying external force to the concrete core, fold the concrete core at the notch and separate it Process and may be provided with a.

In the method for collecting a concrete core of the present invention, the core bit is formed with a plurality of cutting blades arranged in a multi-stage shape. By cutting a concrete structure with the core bit, a cylindrical concrete core is obtained. In addition to being formed, multi-stage cutting grooves can be formed.

By forming multi-stage cutting grooves in this way, it becomes possible to make the core bit slant in the cutting groove, the abutment side of the concrete core is brought into contact with the inner surface of the core bit, and the core bit is turned into the concrete core. External force can be applied. Thereby, a bending moment is made to act on the base end side part connected to the concrete structure of the concrete core, and the concrete core can be folded and separated on the base end side.
In general, when cutting a concrete structure with a core bit, the inside of the core bit is sucked in order to collect dust, and the separated concrete core is held inside the core bit by using this suction force. This makes it possible to collect the concrete core together with the core bit.

Therefore, according to the concrete core collecting method of the present invention, it is possible to eliminate the work of folding the concrete core by inserting chisel into the cutting groove as in the prior art. Can be collected. In addition, since the concrete core can be collected only by the concrete core collecting device, the concrete core can be collected by remote operation.

It is a figure which shows the concrete core extraction apparatus and concrete core extraction method which concern on one Embodiment of this invention. It is a figure which shows the other example of the sampling method of the concrete core which concerns on one Embodiment of this invention.

Hereinafter, with reference to FIG. 1, a concrete core collecting method according to an embodiment of the present invention will be described.

  The concrete core sampling apparatus A according to the present embodiment, like a conventional core drill, is a plate-like base for fixing to a concrete structure, a column extending with one end connected to the base, and detachable from the column. And a rotation drive motor supported so as to be able to advance and retreat along the support column, and a rear end side is connected to the rotation shaft of the rotation drive motor so that the axis line is along the support column, that is, the axis line is in the advance / retreat direction of the rotation drive. A substantially cylindrical core bit 1 (see FIG. 1 (a)) disposed so as to extend along the line.

  On the other hand, in the concrete core collecting apparatus A of the present embodiment, first, one end of the support column is connected to the base via a rotation shaft orthogonal to the extending direction of the support column. At this time, in a normal state, the support column is fixed and disposed so as to be orthogonal to the base, and the support column can be selectively rotated around the rotation axis as appropriate. As a result, the core bit 1 connected to the rotary drive motor supported by the column rotates the column as appropriate, and rotates so that the axis along the column is inclined.

  Note that one end of the column is not connected to the base via the rotation shaft, but the rotation drive motor is supported by the column via the rotation shaft orthogonal to the extending direction of the column, and this rotation It may be provided so as to be rotatable around an axis. In this case, the core drive 1 connected to the rotation drive motor is rotated so that the axis thereof is inclined with respect to the column by rotating the rotation drive motor around the rotation axis orthogonal to the column. Can do.

  Furthermore, as shown in FIG. 1A, the core bit 1 of the present embodiment is provided with a cutting edge 2 at the tip and integrally formed with a plurality of substantially cylindrical bit portions 3, 4, 5 having different diameters. Has been. At this time, the plurality of bit portions 3, 4, 5 are arranged such that the small-diameter bit portions 3, 4 are sequentially inserted into the bit portions 4, 5 having a larger diameter while arranging the axes O 1 on the same axis. The bit portions (3, 4, 4, and 5) that are adjacent to each other in the radial direction are integrally formed. Further, the core bit 1 is arranged on the rear end side in the axis O1 direction with respect to the cutting edge 2 of the bit parts 3 and 4 in which the cutting edges 2 of the bit parts 4 and 5 that are sequentially arranged radially outward are arranged radially inward. It is arranged. In other words, the bit portions (3, 4, 4, and 5) that are adjacent in the radial direction are bit portions 4, 5 that are disposed radially outside the bit portions 3, 4 that are disposed radially inside. However, the position of the cutting edge 2 at the front end is shifted to the rear side in the direction of the axis O1.

  Thereby, the core bit 1 of this embodiment is formed by shifting the plurality of cutting blades 2 to the rear side in the direction of the axis O1 so as to be arranged on the outer side in the radial direction.

  Next, a method for collecting a concrete core from a concrete structure using the concrete core collecting device A of the present embodiment having the above-described configuration will be described, and the concrete core collecting device and the concrete core collecting method of the present embodiment will be described. The effect will be described.

  When a concrete core is collected using the concrete core collecting apparatus A of the present embodiment, first, the base and the column are placed on the concrete structure T so that the core bit 1 is arranged at a predetermined position with respect to the concrete structure T. Fix it. Then, as shown in FIG. 1A, the rotary drive motor is driven to rotate the core bit 1 around the axis O1 along the support column, and the rotary drive motor is advanced along the support column. The core bit 1 is cut from the surface T1 of the concrete structure T.

  Here, in the present embodiment, the core bit 1 is provided with a plurality of cutting blades 2 that are arranged in multiple stages while being displaced in the direction of the axis O1. For this reason, when the cutting edge 2 of the bit part 3 with the smallest diameter is first cut into the concrete structure T and further advances the core bit 1, the bit parts 4 and 5 are sequentially arranged on the outer side in the radial direction. The cutting blade 2 is cut into the concrete structure T.

  Thereby, when the core bit 1 is cut to a predetermined depth of the concrete structure T, the columnar concrete core 6 in a state where the base end is connected to the deep part of the concrete structure T inside the bit part 3 having the minimum diameter. The multi-stage-shaped cutting groove 7 having a larger width is formed around the concrete core 6 as the concrete core 6 is arranged on the surface T1 side of the concrete structure T (cutting process).

  As shown in FIG. 1B, when the core bit 1 is cut to a predetermined deep position of the concrete structure T and the multi-stage cutting groove 7 is formed, for example, one stage of the cutting groove 7 is formed. The core bit 1 is pulled up in the cutting groove 7. Further, the support column is rotated around the rotation axis, the core bit 1 is inclined, and the inner surface 3a of the bit portion 3 with the smallest diameter is placed on the tip 6a side of the concrete core 6 and the cutting edge 2 at the tip of the bit portion 3 with the smallest diameter. Are brought into contact with the side surface 6b on the base end side of the concrete core 6 (core bit tilting step).

  The core bit 1 is rotated by driving, for example, a rotary drive motor in a state where the inner surface 3 a of the bit portion 3 having the minimum diameter and the cutting edge 2 at the tip end are in contact with the concrete core 6. As a result, as shown in FIG. 1C, the force point S1 and the cutting edge 2 at the tip of the bit portion 3 with the minimum diameter come into contact with the six tip portions of the concrete core with which the inner surface 3a of the bit portion 3 with the smallest diameter comes into contact. An external force M is applied from the core bit 1 to the concrete core 6 using the side surface portion of the concrete core 6 as a fulcrum S2. When the external force M is applied in this way, a bending moment acts on the action point S3 on the base end side of the concrete core 1, and the concrete core 6 is bent and separated at the base end side portion (concrete core separation step).

  In addition, as shown in FIG.1 (d), when the concrete structure T is cut with the core bit 1, the suction means for collect | recovering dust is driven, and the suction force which attracts | sucks the inside of the core bit 1 is utilized, The separated concrete core 6 is held inside the core bit 1. Thereby, the core bit 1 is pulled up and collected, and the concrete core 6 is sucked and held by the core bit 1 and collected.

  Therefore, in the concrete core collecting apparatus A and the concrete core collecting method of the present embodiment, the core bit 1 is formed with a plurality of cutting blades 2 arranged in a multi-stage shape. By cutting the object T, the cylindrical concrete core 6 can be formed and the multi-stage cutting groove 7 can be formed.

  Since the multi-stage cutting groove 7 is formed in this way, the core bit 1 can be inclined in the cutting groove 7, and the front end side of the concrete core 6 is brought into contact with the inner surface 3a of the core bit 1. Thus, an external force can be applied from the core bit 1 to the concrete core 6. Thereby, a bending moment is made to act on the base end side part S3 connected to the concrete structure T of the concrete core 6, and the concrete core 6 can be folded and separated on the base end side.

  Therefore, according to the concrete core collecting apparatus A and the concrete core collecting method of this embodiment, it is possible to eliminate the work of folding the concrete core 6 by inserting the chisel into the cutting groove as in the prior art. The concrete core 6 can be collected only by the concrete core collecting device A. Further, since the concrete core 6 can be collected only by the concrete core collecting device A in this way, the concrete core 6 can be collected by remote operation.

As mentioned above, although one embodiment of the concrete core collecting method according to the present invention has been described, the present invention is not limited to the above-described embodiment, and can be appropriately changed without departing from the gist thereof.

  For example, in the present embodiment, the core bit 1 is rotated from the core bit 1 by rotating the core bit 1 by driving the rotary drive motor in a state where the inner surface 3 a of the bit portion 3 and the cutting edge 2 at the tip end are in contact with the concrete core 6. The external force M is applied to the core 6 to fold and separate the concrete core 6. However, the core bit 1 is inclined and the inner surface 3a of the bit portion 3 and the cutting edge 2 at the tip are brought into contact with the concrete core 6, and the core bit The concrete core 6 may be folded by applying an external force M from the core bit 1 to the concrete core 6 by increasing the pressing force to the concrete core 6 with 1 being inclined.

  Further, as in the present embodiment, after the multistage cutting grooves 7 and the columnar concrete core 6 are formed (cutting process) as shown in FIG. 2A, the multistage is formed as shown in FIG. 2B. The core bit 1 is pulled up in the cutting groove 7 and tilted so that the cutting edge 2 at the tip of the core bit 1 is brought into contact with the side surface 6b of the concrete core 6, and the core bit 1 is rotated around the axis O1 to thereby rotate the side surface 6b of the concrete core 6. You may make it form the notch part 8 formed by cutting with the cutting blade 2 (notch part formation process). Then, as shown in FIG. 2 (c), when the core bit 1 is inclined so that the inner surface 3 a of the core bit 1 is brought into contact with the tip 6 a side of the concrete core 6 and an external force M is applied from the core bit 1 to the concrete core 6, 6 can be separated at the notch 8 (concrete core separation step).

  Even in this case, it is possible to obtain the same effect as that of the present embodiment. In this case, since the concrete core 6 can be folded at the position where the notch 8 is formed, the concrete core 6 having a desired length can be easily and reliably collected.

DESCRIPTION OF SYMBOLS 1 Core bit 2 Cutting edge 3 Bit part 4 Bit part 5 Bit part 6 Concrete core 6a Tip 6b Side face 7 Cutting groove 8 Notch A Concrete core sampling device O1 Axis line S1 Force point S2 Support point S3 Action point T Concrete structure T1 Surface

Claims (2)

A strut, a rotary drive motor supported so as to be able to advance and retreat along the strut, and a core bit disposed with its axis line coaxially arranged and detachably connected to the rotary shaft of the rotary drive motor at the rear end side; with concrete coring apparatus comprising, a method for collecting a cylindrical concrete core from the concrete structure,
The core bit is provided with a cutting edge at the tip, and a plurality of substantially cylindrical bit portions having different diameters are arranged in such a manner that their axis lines are coaxially arranged and sequentially arranged radially outward. A plurality of cutting blades are formed in a multi-stage shape, with the cutting blades being stacked together so that the cutting blades are arranged on the rear end side in the axial direction with respect to the cutting blades of the bit portion arranged on the radially inner side. And
The core bit is rotated around the axis while advancing along the support column, and the plurality of cutting blades arranged in a multi-stage shape of the core bit are sequentially cut to a predetermined deep portion position of the concrete structure. Cutting process for forming a cylindrical cutting groove and a cylindrical concrete core;
A core bit tilting step in which the core bit is pulled up and tilted in the multistage cutting grooves, and the inner surface of the core bit is brought into contact with the tip side of the concrete core, and the cutting edge at the tip of the core bit is brought into contact with the side surface of the concrete core. When,
Applying an external force from the core bit to the concrete core, with the tip portion of the concrete core abutting the inner surface of the core bit as a force point and the side portion of the concrete core abutting the cutting edge of the core bit as a fulcrum, A concrete core collecting method comprising: a concrete core separation step of folding and separating at a base end side connected to a concrete structure. A strut, a rotary drive motor supported so as to be able to advance and retreat along the strut, and a core bit disposed with its axis line coaxially arranged and detachably connected to the rotary shaft of the rotary drive motor at the rear end side; with concrete coring apparatus comprising, a method for collecting a cylindrical concrete core from the concrete structure,
The core bit is provided with a cutting edge at the tip, and a plurality of substantially cylindrical bit portions having different diameters are arranged in such a manner that their axis lines are coaxially arranged and sequentially arranged radially outward. A plurality of cutting blades are formed in a multi-stage shape, with the cutting blades being stacked together so that the cutting blades are arranged on the rear end side in the axial direction with respect to the cutting blades of the bit portion arranged on the radially inner side. And
The core bit is rotated around the axis while advancing along the support column, and the plurality of cutting blades arranged in a multi-stage shape of the core bit are sequentially cut to a predetermined deep portion position of the concrete structure. Cutting process for forming a cylindrical cutting groove and a cylindrical concrete core;
The core bit is pulled up and inclined in the multi-stage cutting groove to bring the cutting edge at the tip of the core bit into contact with the side surface of the concrete core, and the core bit is rotated around the axis line to be placed on the side surface of the concrete core. A notch forming step for forming a notch formed by cutting with the cutting blade; and
A concrete core separation step in which the core bit is inclined, the inner surface of the core bit is brought into contact with the distal end side of the concrete core, an external force is applied from the core bit to the concrete core, and the concrete core is folded and separated at the notch. And a method for collecting a concrete core.

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