JPH041145B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a fixing device installed inside a box for magnetically detecting a detection tool installed inside the box and tightly fixing the box to a formwork. This relates to a device to be detected that also serves as a tool.

[Conventional technology]

When burying a box such as an outlet box in a concrete wall, the opening of the box must be firmly attached to the inner surface of the formwork before concrete is poured. Concrete flows into the box from the opening due to the pressure.

Therefore, after the formwork is erected, the position of the box is metal detected from outside the formwork, an insertion hole is drilled in the formwork in the area where the box is located, and a pulling tool inserted into the formwork is inserted into the formwork through this insertion hole. It must be screwed into the screw hole in the bottom, and the box opening must be drawn to the formwork and tightly fixed to the inner surface of the formwork.

[Problem that the invention seeks to solve]

Boxes buried in concrete walls can be made of metal or resin. If the box is made of metal, it should be possible to detect its position from outside the formwork with a metal detector, but The outside of the box is supported in a vertical and horizontal grid pattern by metal squares commonly known as Batakaku.If you try to detect the boxes placed between the formwork using a metal detector, There were many problems where the boxes between the formwork could not be detected because the closest metal flap angle would react.

In addition, when the box is made of resin, a metal member is attached to the appropriate position of the box, and its position is detected in the same manner as a metal box.

In view of the above-mentioned problems, the present invention makes it possible to detect a tool to be detected attached to a box from the outside of the formwork, and also makes it possible to tightly fix the opening of the box to the formwork by using the tool to be detected. This was done with the aim of improving work efficiency.

[Means for solving problems]

The present invention is a detection tool that doubles as a fixing tool installed inside a box to magnetically detect the position of the detection tool installed in the box from outside the formwork and tightly fix the opening surface of the box to the inner surface of the formwork. The base end of the main body is provided with a mounting part that is attached to the bottom plate of the box, and the tip part is provided with a screw part that is screwed into a pulling tool for drawing the box to the formwork. This is a device to be detected that doubles as a fixture to be installed inside a box, characterized by being equipped with a magnetic part that emits lines of magnetic force toward the frame.

〔Example〕

1 to 3 show a detected tool A according to the present invention. This detected tool A also functions as a fixture for the box.

This detected tool A has a seat plate 2 provided at the base end of a cylindrical main body 1, and a male threaded portion 5 which is threaded into the bottom plate 4 of an outlet box 3 from the seat plate 2 toward the base end. A female screw portion 7 is provided from the center of the main body 1 toward the tip thereof to be screwed together with a drawing bolt 6 (see FIG. 4 C) constituting the drawing tool. This is a structure in which a is buried. The tip of the main body 1 is largely chamfered.

A seat part 8 is provided at the center of the bottom plate 4 of the outlet box 3 to protrude inward, and a female screw part 9 provided on the seat part 8 and a male thread part provided at the base end of the detected tool A are connected to each other. The screw portion 5 is screwed together, and the detected tool A is thereby installed in the outlet box 3. In this state, the tip surface of the detected tool A is
It is located substantially on the same plane as the opening surface of the outlet box 3, or slightly inside the opening surface of the outlet box 3.

In the example shown in FIG. 4, an outlet box 3 is attached to the lower end of the conduit P, and the formwork 11 is erected after the conduit P is tied to nearby reinforcing bars 10 at several locations.

In this state, as shown in FIG. 4A, when the position of the detected tool A installed in the outlet box 3 is detected using the magnetic detector 12 for detecting the location where magnetism is generated, this Since magnetic lines of force are emitted from the magnet M embedded in the detection tool A toward the formwork 11, the metal baton supporting the formwork 11, which is located closest to the magnetic detector 12, Detected tool A emits magnetic lines of force by the magnetic detector 12 without reacting to corners (not shown)
only detected.

Then, the position S where the lines of magnetic force are emanating from the formwork 11
At the same time, use a drill (not shown) to drill an insertion hole 13 for the pull bolt 6 at this position S (FIG. 4B).

Next, as shown in FIG. 4C, the drawing bolt 6 is inserted into the insertion hole 13 drilled in the formwork 11, and its tip is screwed into the female screw part 7 of the detection tool A. When the nut 14 is screwed onto the drawing bolt 6 and tightened, the outlet box 3 is drawn to the inner surface 11a of the formwork 11 and comes into close contact with it. Now, outlet box 3 is connected to formwork 11.
It is tightly fixed to the When the outlet box 3 is drawn to the inner surface 11a of the formwork 11 by the drawing bolt 6, the tip of the main body 1 of the detection tool A comes into contact with the inner surface 11a of the formwork 11, so the drawing force of the drawing bolt 6 pulls the outlet box 3
This prevents the bottom plate 4 from bending inward.

In this state, concrete C is placed between the formwork 11, and after the concrete C has hardened, the formwork 11 is removed and the detected tool A is removed from the outlet box 3, as shown in Fig. 4D. In, Outlet Box 3 is a concrete wall W
buried within.

Further, a detected tool A' according to another embodiment of the present invention shown in FIG. 5 has a ring-shaped magnet M' fitted on the outside of the tip of the main body 1.

In addition, the structure for attaching the detected tool to the bottom plate of the box is not limited to the one using screws as in each of the above embodiments. For example, as shown in FIG. A flange 15 is provided at the base end of the box 1, and an insertion hole 16 is bored in the flange 15. A pilot hole 17 is also drilled in the bottom plate 4 of the box 3, and the user cuts a screw into the pilot hole 17 by himself. It is also possible to adopt a structure in which a tuft pin screw 18 is used, and the tatu pin screw 18 is inserted through the insertion hole 16 and screwed into a pilot hole 17 provided in the box 3.

It is also possible to configure the device to be detected to emit lines of magnetic force by magnetizing itself, and the position of the magnet provided in the device to be detected may be such that it is buried inside the main body as in the embodiments of the above-mentioned inventions. It goes without saying that it is not limited to being fitted onto the outside of the tip of the main body, and may be fitted to any part of the main body.

〔Effect of the invention〕

In the present invention, the base end of the main body is provided with an attachment part that is attached to the bottom plate of the box, and the tip part is provided with a screw part that is screwed into a pulling tool for drawing the box to the formwork. Moreover, since the device to be detected is equipped with a magnetic part that emits magnetic lines of force toward the formwork inside the box, the magnetic detector is attached to the so-called butterfly angle made of metal that supports the outside of the formwork. Only the tool to be detected attached to the box can be accurately and quickly detected by the magnetic detector without reacting to metal objects existing around the box, improving work efficiency.

In addition, since the detected tool installed inside the box functions as a fixing tool, after detecting the position of the detected tool, an insertion hole is drilled in the formwork and the pulling tool is inserted into this insertion hole. By screwing this pulling tool onto the detected tool installed inside the box, the box can be pulled toward the formwork and fixed tightly, and the box can be easily and quickly tightly fixed to the formwork. .

Furthermore, by determining each dimension so that the tip end surface of the detected device installed in the box is on the same level as the opening surface of the box, or located slightly inside the opening surface of the box, the drawing device can When the box is drawn to the formwork and fixed tightly, the tip end surface of the detection tool comes into contact with the inner surface of the formwork, so that the bottom plate of the box can be prevented from bending inward due to the pulling force of the drawing tool.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view of the detected tool A, and FIG.
Similarly, a partially cutaway perspective view, FIG. 3 is a cross-sectional view of the detection device A installed inside the outlet box 3, and FIGS. FIG. 3 is a sectional view showing the work process of detecting the position of the detection tool A using a magnetic detector 12 and closely fixing the outlet box 3 to the formwork 11; A cross-sectional view of the position of the detected tool A being detected by the magnetic detector 12;
A cross-sectional view of the state in which the insertion hole 13 for the pull bolt 6 is drilled in the formwork 11 after detecting the detection tool A; Fig. 5 is a cross-sectional view of the state in which concrete C is poured between the formwork 11 in a closely fixed manner, and the same is a cross-sectional view of the state in which the formwork 11 and the detected tool A are removed after the concrete C has been cast. is a detected tool according to another embodiment of the present invention
FIG. 6 is a partially cutaway perspective view of A' and a cross-sectional view of a detected device A'' according to yet another embodiment of the present invention attached to the bottom plate 4 of the outlet box 3. Explanation of part symbols] A, A′, A″: Device to be detected, M, M′: Magnet (magnetic part), P: Conduit,
1: Main body of the detected tool, 3: Outlet box (box), 5: Male screw part (attachment part) of the detected tool, 6: Pull bolt (pulling tool), 7: Female thread part of the detected tool ( Thread part), 11: Formwork, 1
2: Magnetic detector, 15: Flange, 18: Tatsu pin screw.

Claims (1)

[Scope of Claims] 1. A fixing device installed inside the box for magnetically detecting the position of the detected tool installed inside the box from outside the formwork and tightly fixing the opening surface of the box to the inner surface of the formwork. The device to be detected is provided with a mounting portion attached to the bottom plate of the box at the base end of the main body, and a threaded portion screwed into the pulling tool for drawing the box to the formwork at the tip. What is claimed is: 1. A device to be detected which doubles as a fixing device to be mounted inside a box, characterized in that it is equipped with a magnetic part that emits lines of magnetic force toward the formwork. 2 Claim 1, characterized in that the magnetic part is constructed by providing a separate magnet in the main body.
A device to be detected that doubles as a fixing device to be installed in the box described in Section 1. 3. The device to be detected which also serves as a fixture to be installed in a box as set forth in claim 1, wherein the magnetic part is constructed by magnetizing the main body itself.