JPH08105201A - Trimming die - Google Patents

Abstract

PURPOSE: To facilitate its extraction from a concrete structure by dividing it into plural pieces of split section by a longitudinally cutting split surface, and making one split section extractable in the axial direction from the one side. CONSTITUTION: A trimming die, formed into cylindrical form, is divided into two vertically split split sections 2a and 2b by a split surface 1 longitudinally dividing it, and this split surface 1 is tilted to the center shaft to some extent, and in a state that it is embedded in a concrete structure 5, the split section 2a is made extractable in the left-hand direction and the split section 2b in the right inner direction, respectively. Next, at a time when this split section 2a is extracted, since its contact area with the concrete structure 5 is small, it is easy to be pulled out as compared with such a case as extracting the whole body at one time. In succession, the remaining split section 2b is pulled out after separating from the structure 5 so as to make it draw near to the side of an air space 7 formed with the split section 2b extracted, thereby securing a through hole 6. With this constitution, extracting work on the trimming die at the time of forming this through hole 6 in the structure 5 can be facilitated in this way.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention forms a through hole through which piping, wiring, etc. are formed in a concrete structure such as a wall or floor of a building by removing the buried structure after removing the concrete structure. Regarding the cutting die used for.

[0002]

2. Description of the Related Art Conventionally, as a die, a die made of synthetic resin or metal tubing cut to an appropriate length and coated with a release agent on the outer periphery has been used.

[0003]

However, in the case of the conventional punching die, since it is firmly adhered to the concrete, it takes a lot of time to pull it out, and a part of the constructed concrete structure must be destroyed. There is also a situation where it becomes impossible to obtain profit.

The present invention has been made in view of such conventional problems, and an object of the present invention is to facilitate the drawing of the cutting die.

[0005]

[Means for Solving the Problems] The means taken for this purpose according to the invention of claim 1 will be explained with reference to FIG. 1 showing an embodiment. By removing the means after embedding it in a concrete structure 5 (see FIG. 2). In a die for forming a through hole 6 (see FIG. 2) in a concrete structure 5, a columnar shape is obtained by dividing a plurality of vertically divided divided pieces 2a, 2b by a vertically divided dividing surface 1. The divided pieces 2a, 2b At least one of
This is a punching die that can be pulled out in the axial direction from one end face side in a state of being embedded in the concrete structure 5.

[0006] Further, the means taken in the invention of claim 5 will be explained with reference to FIG. 9 showing an embodiment.
(See FIG. 2) After being embedded in the concrete structure 5, the cylindrical outer cylinder portion 3 made of synthetic resin foam is used in the punching die that forms the through hole 6 (see FIG. 2) in the concrete structure 5.
And a core portion 4 fitted into the outer cylinder portion 3, and the core portion 4 is a punching die that can be axially pulled out from one end face side in a state of being embedded in a concrete structure 5. .

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an embodiment of the invention of claim 1 in which a cutting die has a columnar shape and is divided into two vertically divided division pieces 2a and 2b by a division surface 1 for longitudinally cutting the die. It is divided in two. The dividing surface 1 is inclined with respect to the central axis, and in the state of being embedded in the concrete structure 5 (see FIG. 2), the dividing piece 2a is pulled out in the left front direction in the drawing, and the dividing piece 2b is pulled out in the right back direction in the drawing. It is possible.

Although the punching die has a cylindrical shape as described above,
If necessary, the columnar shape may be another columnar shape such as a prismatic shape or an elliptic cylindrical shape. The size is the through hole 6 to be formed.
It may be determined according to the size (see FIG. 2) and the thickness of the concrete structure 5 (see FIG. 2), but generally the diameter is 20 to 200 mm and the length is 500 to 700 mm.

The dividing surface 1 is preferably inclined with respect to the central axis in order to assist the pulling out of the divided pieces 2a, 2b, but it may be parallel to the central axis. Also, in order to assist the pulling out of the split pieces 2a, 2b, the split surface 1
It is preferable to attach a slipping layer to this. This slipping layer may be of any type as long as it improves the slippage between the divided pieces 2a and 2b. For example, a synthetic resin film having good slipperiness may be adhered or fused or a release agent may be applied. Can be provided.

Each of the divided pieces 2a, 2b has a handle portion 8 formed on the end surface on the pulling side. This handle part 8
Is a clue when pulling out from the concrete structure 5 described later. Although the handle portion 8 can be omitted, it is preferably provided for improving workability, and may be provided only on one of the divided pieces 2a or 2b.

This punching die is made of a hard material such as non-foaming synthetic resin, wood, metal, etc. by selecting a material that does not easily adhere to concrete or by attaching a release layer on the outer peripheral surface. However, it is preferable to use a synthetic resin foam because it is lightweight, easy to handle, and easy to remove.

The release layer is a layer for facilitating peeling from concrete, and its attachment is made of a synthetic resin film which is hard to adhere to concrete, such as application of a release agent or polyethylene film. It can be performed by winding, adhering, fusing or the like. This release layer is preferably provided to facilitate removal of the main die even when it is made of synthetic resin foam.

Particularly when the split pieces 2a and 2b are made of a synthetic resin foam which is liable to be broken or cracked, the divided pieces 2a and 2b are tightly wrapped by a synthetic resin film which also serves as the slipping layer and the release layer. This is preferable because the reinforcing effect of (1) makes it easy to prevent breakage and cracking during drawing. In addition, by wrapping the outer periphery with a synthetic resin film that constitutes the release layer, it is possible to prevent the divided pieces 2a and 2b from coming apart.

When the punching die is made of synthetic resin foam, any synthetic resin foam may be used as long as it can maintain its shape when it is embedded in the concrete structure 5.
A polyolefin-based synthetic resin foam is preferred. The polyolefin-based synthetic resin foam is a foam of polyethylene, polystyrene or a copolymer containing 50% by weight or more of these, and is unlikely to be broken or cracked during drawing, and can maintain its shape when embedded in a concrete structure. Easy to obtain tensile strength, flexibility, waist strength, compressive strength, etc.

The polyolefin synthetic resin foam has a foaming ratio of 5 to 200 in order to obtain the above-mentioned strength, to reduce the size of the cells, and to suppress the increase in the adhesive strength with the concrete due to the penetration of the concrete into the cells. It is preferably double, and more preferably 10 to 60 times.

Since the cutting die made of the above-mentioned polyolefin synthetic resin foam has excellent strength, it can withstand repeated use several times and is economically advantageous.

Next, a method of using the punching die will be described.

First, as shown in FIG. 2A, the main die is embedded in the concrete structure 5 with both ends thereof protruding.

Next, as shown in FIG. 2B, the divided piece 2a is pulled out. At this time, the surface of the divided piece 2a in contact with the concrete structure 5 is about 1/2 of the entire main die, and the contact area with the concrete structure 5 is small.
Easy to pull out compared to pulling out the whole at once.

In particular, as shown in the figure, when the dividing surface 1 is inclined with respect to the central axis and the dividing piece 2a has a so-called tapered shape, if the dividing piece 2a is pulled out a little, it will be a little later. It can be pulled out without applying force, and the pulling out work becomes easy. If the punching die is made of synthetic resin foam, it is easy to insert a spatula-shaped instrument at the interface between the divided piece 2a and the concrete structure 5, and the peeling work using such an instrument is facilitated. .

As shown in FIG. 2 (c), after the divided pieces 2a are completely extracted, the remaining divided pieces 2b are brought closer to the space 7 side formed by the extraction of the divided pieces 2a, so that the divided pieces 2a can be easily drawn. It can be peeled off from the concrete structure 5 and pulled out. Then, as a result, the through hole 6 as shown in FIG. 2D can be obtained.

By the way, as in the cutting die explained in FIG. 1, the divided pieces 2a, 2 vertically divided by the divided surface 1 to be cut vertically.
In the case of the cutting die divided into b, the divided pieces 2a, 2
b may fall apart. Therefore, as shown in FIG. 3, both ends are covered with the caps 9 and the divided pieces 2a, 2
It is preferable that b is not separated.

If it is only to prevent separation of the divided pieces 2a and 2b during transportation, it may be stopped with an adhesive tape or a string, but according to the cap 9, the concrete structure 5 ( By embedding in (see FIG. 2) (the cap 9 part is made to project from the concrete structure 5), concrete can be prevented from flowing into the handle part 8. Further, as shown in FIG. 4, even if the hollowed-out piece 10 for forming the handle portion 8 is still embedded, the handle portion 8 can be embedded with concrete by temporarily fixing it with an adhesive tape or the like. It is possible to prevent it. Further, the cap 9 (see FIG. 3) may be fitted while the hollowed-out piece 10 is embedded.

FIG. 5 shows another division state of the cutting die according to the invention of claim 1, which is two division surfaces 1, 1 which are longitudinally cut.
Is divided into three vertically divided pieces 2a, 2b, 2c. Further, the split surfaces 1 and 1 are inclined in a direction intersecting with each other on one end surface side.

In the case of the main punching die, the central dividing piece 2b is easy to pull out in the direction of the arrow because the dividing surfaces 1 and 1 are inclined. Therefore, first of all, the central divided piece 2
By removing b, a space 7 (see FIG. 2) is formed in the center, and the remaining split pieces 2a and 2c are easily moved by pulling them away from the concrete structure 5 (see FIG. 2) so that they are brought closer to the space 7 side. You can turn around.

6 to 8 each show another division state of the punching die according to the invention of claim 1, and FIGS. 6 and 7 show two division surfaces 1 and 1 to be vertically cut into three vertical divisions. Split piece 2a,
Another example of the case of 2b, 2c, FIG. 8 is a vertically divided division piece 2 with three or more division surfaces 1, 1, ...
It shows an example in the case of a, 2b, ....

FIG. 9 shows an embodiment of the cutting die according to the invention of claim 5, in which the dividing surface 1 is formed so as to pierce the central portion into a frustoconical shape. It is divided into an outer cylinder portion 3 having a cylindrical shape and a truncated cone-shaped core portion 4 fitted therein.

The outer cylinder portion 3 is made of the same synthetic resin foam as that described for the punching die shown in FIG. Further, the core portion 4 is also preferably made of the same synthetic resin foam, but may be made of a hard material such as non-foaming synthetic resin, wood, or metal. In either case, it is preferable to provide a handle portion 8 on the end surface of the core portion 4 in the pulling direction.

The core portion 4 has a truncated cone shape so that it can be easily pulled out in the direction of the arrow. However, the dividing surface 1 may be formed by hollowing out the central portion into a cylindrical shape. it can. Further, when the core portion 4 is made of a hard material, the weight can be reduced by using this as a pipe material.

The punching die can take various shapes such as a prismatic shape or an elliptic cylindrical shape, if necessary, similarly to the punching die explained in FIG. 1, and the core portion 4 has a shape corresponding thereto. Can be Further, it is the same as in the punching die described in FIG. 1 that it is preferable to attach a slipping layer to the dividing surface 1 or to provide a release layer on the outer surface.

In the case of the main cutting mold, first, the core portion 4 is pulled out, and then the remaining outer cylinder portion 3 is crushed toward the center, so that the outer cylinder portion 3 and the concrete structure 5 (see FIG. 2).
It can be easily removed by peeling the gap. In particular, the reason why the outer cylinder portion 3 is made of synthetic resin foam is to enable the outer cylinder portion 3 to be crushed toward the center when the outer cylinder portion 3 is removed.

[0032]

EFFECTS OF THE INVENTION The present invention is as described above, and it is extremely easy to pull out a punch when forming a through hole 6 in a concrete structure 5 and the workability can be improved. Is.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a punching die according to the invention of claim 1. FIG.

FIG. 2 is an explanatory view of a method of using the cutting die shown in FIG.

FIG. 3 is a cross-sectional view showing an example of a case where the cutting die is prevented from being separated and the handle portion is protected.

FIG. 4 is a cross-sectional view showing another example of the case where the handle portion is protected.

FIG. 5 is a perspective view showing another split state of the punching die according to the invention of claim 1;

FIG. 6 is a side view showing another split state of the punching die according to the invention of claim 1.

FIG. 7 is a side view showing another split state of the punching die according to the invention of claim 1.

FIG. 8 is a side view showing another split state of the punching die according to the invention of claim 1.

FIG. 9 is a perspective view showing an embodiment of the punching die according to the invention of claim 5;

[Explanation of symbols]

 1 Divided surface 2a, 2b, ... Divided piece 3 Outer cylinder part 4 Core part 5 Concrete structure 6 Through hole 7 Space 8 Handle part 9 Cap 10 Drilled piece

Claims (6)

[Claims] Claim: What is claimed is: 1. A cutting die for forming a through hole in a concrete structure by burying it in a concrete structure and then removing it, thereby forming a columnar shape which is divided into a plurality of vertically divided pieces by a dividing surface to be cut vertically. At least one of the divided pieces is capable of being pulled out in the axial direction from one end face side in a state of being embedded in a concrete structure. 2. The die according to claim 1, wherein the die is divided into two parts by one parting surface inclined with respect to the central axis. 3. It is divided into three by two dividing surfaces,
At least one of the divided surfaces is inclined in a direction in which the two divided surfaces intersect with each other on one end surface side.
Punching die. 4. A handle portion is formed on an end face of a pull-out split piece on the pull-out side.
1 to 3 punching die. 5. A tubular outer cylinder part made of synthetic resin foam in a die for forming a through hole in a concrete structure by removing it after being embedded in the concrete structure, and the outer cylinder part. And a core part fitted in the core part, the core part being capable of being axially pulled out from one end face side in a state of being embedded in a concrete structure. 6. The punching die according to claim 5, wherein a handle portion is formed on the end surface of the core portion on the pulling-out side.