JP4509596B2 - How to open the embedded bracket - Google Patents

Description

  The present invention relates to a method of drilling holes from the surface of a lightweight cellular concrete panel (hereinafter referred to as ALC panel) and opening an embedded metal fitting built in the ALC panel on the surface of the ALC panel.

The ALC panel has an embedded metal fitting for attaching the ALC panel to a building frame or the like. There are various known structures of the embedded metal fittings including those described in Patent Document 1, for example.
Conventionally, the method of drilling holes from the surface of the ALC panel and opening the embedded metal fittings on the surface of the ALC panel is based on the positional information of the embedded metal fittings in the plane direction of the ALC panel and the depth direction from the ALC panel surface. It was obtained from the design value of the ALC panel and drilled with a drilling device.

However, since the depth from the surface of the ALC panel to the tip of the embedded metal fitting is originally different for each embedded metal fitting, the position of the tip of the embedded metal fitting is determined according to the conventional method. When the surface is shallower than the design value, the tip of the hole, that is, the cutter blade of the hole drilling device hits the tip of the embedded metal and both are damaged. On the other hand, when the position of the tip of the embedded bracket is deep, the embedded bracket does not open on the surface of the ALC panel, and there is a problem that it may hinder the mounting of the ALC panel. .
On the other hand, as described in Patent Document 2, for example, a technique is known in which a machining load during drilling is monitored and a tool abnormality is determined by comparing the machining load with an overload determination value. However, as in the present invention, the cutting hole is stopped before the cutting edge of the cutter blade of the hole drilling device comes into contact with the tip of the embedded bracket, and the embedded bracket is reliably opened on the surface of the ALC panel. It is not applicable to the purpose.

JP 2000-248636 A Japanese Examined Patent Publication No. 6-20652

  Even if the depth from the surface of the ALC panel to the tip of the embedded metal fitting varies, the present invention avoids contact between the cutting edge of the cutter blade and the embedded metal fitting during drilling. An object of the present invention is to provide a method for reliably opening the embedded metal fitting on the surface of the ALC panel.

In order to solve the above-mentioned problems, the present invention is a method of opening an embedded metal fitting built in a lightweight cellular concrete panel on the surface of the lightweight cellular concrete panel, wherein a drilling load detecting means is provided at the position of the embedded metal fitting. Drilling starts from the surface of the lightweight cellular concrete panel with a drilling means having a diameter, and the drilling load is reduced when the tip of the drilled hole reaches the end of the cavity generated in advance at the tip of the embedded bracket This is a method for opening an embedded metal fitting built in a lightweight cellular concrete panel, characterized in that it is detected by a drilling load detecting means according to the change and the drilling of the drilling means is stopped.
In the above-mentioned method for opening the embedded metal fitting built in the lightweight cellular concrete panel, the embedded metal hardware comprises a long nut and a plate to which the long nut is fixed.

  The opening method of the embedded metal fitting built into the lightweight cellular concrete panel of the present invention avoids both damage due to contact between the cutter blade of the hole drilling device and the embedded metal fitting when the ALC panel is drilled from the surface. The embedding bracket has an effect of reliably opening the surface of the ALC panel.

The best mode for carrying out the method for opening the embedded metal fitting built into the lightweight cellular concrete panel of the present invention will be specifically described below.
In the present invention, as shown in FIG. 1, load power of a drilling cutter motor 13 that drives the drilling cutter 10 of the drilling device 9 is detected by a load detection device 16 as means for detecting a drilling load.
As shown in FIG. 2, the embedded metal fitting 2 includes a long nut 3 and a plate 4 to which the long nut 3 is fixed, and the plate 4 is joined to a reinforcing reinforcing bar 5 of the ALC panel 1. A cavity 7 is generated in advance at the tip of the long nut 3 of the embedded metal fitting 2. For example, in the manufacturing process of the ALC panel, the cavity 7 is formed by inserting one end of a resin sealing plug into the inside from the tip of the long nut 3 and stretching the other end of the sealing plug from the tip of the long nut 3. When the ALC panel 1 is subjected to high-temperature and high-pressure treatment in the autoclave, the sealing plug is ashed and generated. For example, the sealing plug is preferably a resin foam, and more preferably a polyethylene foam.

Next, a method for opening the embedded metal fitting built in the lightweight cellular concrete panel of the present invention will be described with reference to FIG.
The ALC panel 1 transported by the transport device 8 is stopped at a predetermined position in the long side (X-axis) direction of the ALC panel 1. The hole cutter cutter motor 13 is activated to rotate the cutter blade 11 of the hole cutter 10. The lifting cylinder 12 is driven to raise the drilling cutter 10 toward the ALC panel 1. At the same time, the Y-axis servo motor 14 of the drilling device 9 is driven, and the drilling device 9 is moved to the short side (Y of the ALC panel 1 until the optical sensor 15 detects the mark attached to the surface of the ALC panel 1. Axis) direction. As a result, the cutter blade 11 of the drilling cutter 10 is set at the lower position of the embedded metal fitting 2 to be drilled.

When the drilling cutter 10 continues to rise, the cutting edge of the cutter blade 11 reaches the surface of the ALC panel 1 and starts drilling. When the blade edge of the cutter blade 11, that is, the tip of the hole hole 6 reaches one end of the cavity 7, the area of the ALC panel 1 drilled by contacting the blade edge of the cutter blade 11 is reduced. The load on the cutter 10 is slightly reduced. The sequencer 19 detects a decrease in load based on the load power signal input from the load detection device 16, drives the elevating cylinder 12 to lower the cutter blade 11 away from the ALC panel 1, and further performs a drilling cutter motor 13. To stop drilling.
A sequencer 19 that stores the entire machining process program of the present invention monitors, drives, and controls the elevating cylinder 12, the drilling cutter motor 13, the Y-axis servomotor 14, and the like. In the load detection device 16, the load current and the load voltage of the drilling cutter motor 13 are input to the current input terminal 17 and the voltage input terminal 18, the drilling load is detected by load power, and a load power signal is output to the sequencer 19. To do.

The change of the drilling load when drilling is performed according to the present invention and the conventional method will be described in Examples and Comparative Examples.
3 and 4 are diagrams showing changes in load power of the drilling cutter motor 13 in the drilling process, where the vertical axis shows the load power and the horizontal axis shows the time.

[Example 1]
FIG. 3 is a view showing an example of drilling according to the present invention. In A, the drilling cutter motor 13 has already been driven, and the drilling cutter 10 is moving upward toward the ALC panel 1. In B, when the cutting edge of the cutter blade 11 reaches the surface of the ALC panel 1 and starts drilling, the load power clearly increases. In C, when the cutting edge of the cutter blade 11, that is, the tip of the hole 6 reaches the one end of the cavity 7, the load on the hole cutter 10 is slightly reduced. At D, the sequencer 19 detects a decrease in load based on the load power signal input from the load detection device 16 and drives the elevating cylinder 12 to lower the cutter blade 11 away from the ALC panel 1. Further, at E, the drilling cutter motor 13 is stopped.

[Comparative Example 1]
FIG. 4 is a view showing a comparative example in which holes are drilled by a conventional method. Each point of A to E indicates the load power of the drilling cutter motor 13 during each drilling process in the same manner as in FIG. In this example, the position information of the embedded metal fitting 2 in the depth direction from the surface of the ALC panel 1 described in the prior art is obtained from the design value, and drilling is started. Is a change in the load power when it is shallower than the design value. In F, the cutting edge of the cutter blade 11 hits the tip of the embedded metal fitting 2 and the load power is drastically increased. That is, in C, as a result of continuing drilling to the depth obtained from the design value of the ALC panel despite the decrease in load power, in F, the cutting edge of the cutter blade 11 contacts the tip of the long nut 3, In G, the load power continues to increase until the elevating cylinder 12 is driven to lower the cutting edge of the cutter blade 11 away from the ALC panel 1.

  The present invention can be suitably used in the field of opening an embedded bracket of an ALC panel in which the embedded bracket is built.

It is a figure which shows the structural example of the apparatus which opens the ALC panel with an embedded metal fitting. It is a figure which illustrates the structure of the embedded metal fitting of an ALC panel, a cavity, and a hole. It is a figure which shows the change of the drilling load at the time of drilling by this invention in an Example. It is a figure which shows the change of the drilling load at the time of drilling by the conventional method by a comparative example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... ALC panel 2 ... Embedded metal fitting 3 ... Long nut 4 ... Plate 5 ... Reinforcing bar 6 ... Drilling hole 7 ... · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·································································· hole cutter ...... Motor for drilling cutter 14 ・ ・ ・ ・ ・ Y-axis servo motor 15 ・ ・ ・ Optical sensor 16 ・ ・ ・ ・ ・ Load detector 17 ・ ・ ・ ・ ・ Current input terminal 18 ・・ ・ ・ ・ Voltage input terminal 19 ・ ・ ・ Sequencer

Claims (2)

  A method of opening an embedded metal fitting built in a lightweight cellular concrete panel on the surface of the lightweight cellular concrete panel, wherein the lightweight cellular concrete panel is formed by a drilling means having a drilling load detecting means at a position of the embedded metal fitting. Drilling is started from the surface of the metal, and the drilling load detecting means detects that the tip of the drilling hole has reached the end of the cavity generated in advance at the tip of the embedded metal fitting by a change in the drilling load. The method for opening the embedded metal fitting built in the lightweight cellular concrete panel is characterized by stopping the drilling of the drilling means. 2. The method for opening an embedded metal fitting embedded in a lightweight cellular concrete panel according to claim 1, wherein the embedded metal fitting comprises a long nut and a plate to which the long nut is fixed.

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