JPS6324196Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field This invention is a concrete formwork that can form a spiral groove in the cone hole that remains in the concrete wall after the formwork is removed, which serves as a foothold for mortar to fill the cone. Regarding wood cones.

BACKGROUND TECHNOLOGY As shown in Fig. 1, when forming an exposed concrete wall b using a formwork a, a frame board (sheath board)
Holes (cone holes) f for wooden cones e installed at both ends of the separator d remain in the concrete wall b in order to maintain the distance c. Therefore, conventionally, after removing the formwork a, the cone holes f are filled with mortar g as shown in FIG. 2 to close the cone holes f.

Problems to be Solved by the Invention However, since the filling of the mortar g into the cone hole f is done after the concrete wall b has hardened, drying shrinkage (hardening) causes the cone hole f to A skin gap h is created between the two. For this reason, when rainwater or the like floods into that area and freezes, the mortar g may fall off from the cone hole f due to its peeling force. The mortar g filled in the cone hole f was connected to the threaded portion i at the end of the separator d, but this was insufficient to suppress the above-mentioned peeling force since skin gaps also occurred in this portion.

Note that as a technique for preventing the occurrence of skin fraying, the technique disclosed in Japanese Patent Application Laid-Open No. 109214/1983 is known.

In this known example, since it is necessary to break off the cut portions provided at predetermined positions on both ends of the separator, there is a risk that the cone hole will be damaged during this work, and there is a risk that the mortar that will be filled in in a later process may cause plowing. There is. Furthermore, in order to break off the ends of the separator, it is necessary to provide a prevention plate and a seat plate, resulting in problems such as a complicated structure.

Purpose of the invention This invention was made to solve the problems of the conventional method.The purpose was to have a simple structure,
The object of the present invention is to provide a wooden cone for concrete formwork that is easy to assemble and handle.

Means for Solving the Problems The wooden cone for concrete formwork according to this invention is a wooden cone that is screwed onto both ends of the separator to maintain the spacing between the frame plates when forming a concrete wall using the formwork. In the cone, a frame structure is formed,
A cone main body that has a spiral groove formed on its outer circumferential surface and two flanges with a hole in the center at the center and small-diameter end of the inside, and is loosely fitted into both holes of the two flanges of this cone main body. supported, forming a flange in the middle part thereof, and positioning this flange in the gap between the two flanges of the cone main body,
A connecting core material that is connected to the cone main body so as to be rotatable and movable within a predetermined range, and has a threaded portion on the inner periphery, and is screwed onto each end of the separator to the threaded portion, and this connecting core material. The frame plate presser rod is attached to the side opposite to where the separator is attached.

Function of the device In this device, the flange on the center side of the cone main body is in contact with the flange of the connecting core material, and one side of the connecting core material is screwed into the threaded part of the separator. Attach the formwork using the frame plate presser rod attached to the other side of the lumber. and,
In this state, a concrete wall is formed.

When removing a concrete wall after pouring, first rotate the main cone in the removal direction until the flange on the small diameter side touches the flange of the connecting core material,
When both flanges come into contact, rotate the connecting core in the opposite direction and push it in until the center flange inside the cone body comes into contact with the flange of the connecting core, and then push the cone body again until the small diameter flange of the cone body comes into contact with the flange of the connecting core. The cone main body is removed from the concrete wall by repeating the operation of rotating in the removal direction until it abuts the flange, and then the connecting core material is removed by removing it from the separator.

After the wooden cone is removed, a spiral groove is formed on the inner peripheral surface of the cone hole by the spiral groove formed on the outer peripheral surface of the cone main body.

Therefore, the mortar filled in this spiral groove portion acts as a foothold, and even if rainwater or the like enters the skin gap between the cone hole and freezes, the mortar will not fall off from the cone hole.

Embodiment of the invention Hereinafter, an embodiment of the invention will be described based on FIG.

The figure shows the state of a concrete wall 1 after it has been poured, with 2 being a frame plate, 3 being a separator, 4 being a wooden cone, and 5 being a frame plate holding bar.

The wooden cone 4 shown here includes a cone main body 8 having a spiral groove 7 formed on its outer peripheral surface 6, and a connecting core member 9 attached to the axial center of the cone main body 8 so as to be rotatable and movable within a predetermined range. It is composed of. The cone main body 8 has a frame structure, and the connection core material 9 is loosely fitted and supported in holes 12 and 13 of flanges 10 and 11 formed at the inner center and small diameter side ends, and the connection core material 9 is loosely fitted and supported. The core material 9 has a flange 14 formed in its middle portion, which is connected to the flange 10,
By positioning it in the gap 15 between 11 and 11, it can rotate freely relative to the cone main body 8 and within a predetermined range (the gap 1
5 length range) are movably coupled. In addition, a female screw hole 16 is provided at the axis of the connection core material 9.
A threaded portion 17 of the separator 3 is screwed into this female threaded hole 16. Connection core material 9
The frame plate presser rod 5 is inserted and fixed (by welding, etc.) into the axis opposite to the female threaded hole 16.

In the wooden cone 4 of the embodiment having such a structure, the connecting core member 9 and the cone main body 8 are in the state shown in the figure, that is, the central flange 1 of the cone main body 8
0 is set in contact with the flange 14 of the connecting core member 9. However, when removing the concrete wall 1 after pouring, as shown in FIG. Rotate the connecting core material 9 in the pulling direction until it contacts the flange 14 of the connecting core material 9, then rotate the connecting core material 9 in the pulling direction until its flange 14 contacts the central flange 10 of the cone main body 8. By repeating these operations, the cone main body 8 is separated from the concrete wall 1.
Further, the connecting core material 9 is removed from the separator 3.
For such rotational operation of the cone main body 8 and the connecting core member 9, a recess 18 formed on the large diameter side end surface of the cone main body 8 and a recess 19 formed on the outer end of the frame plate presser rod 5 are used. A removal tool that can be used is used.

When the wooden cone 4 is removed as described above, a cone hole 22 having a spiral groove 21 on the inner peripheral surface 20 remains in the concrete wall 1. When this cone hole 22 is filled with mortar 23, the mortar 23 shrinks during drying to form a gap 24 between the cone hole 22 and the threaded portion 17 of the separator 3, as shown in FIG. However, the mortar 23
Since this part is also filled, this part becomes a foothold, and even if rainwater or the like enters the skin gap 24 part and freezes, its peeling force can be suppressed, and therefore, it does not fall off from the cone hole 22.

Effects of the invention As described above, according to this invention, when forming a concrete wall using a formwork, the frame structure is improved in the wooden cones that are screwed onto both ends of the separator to maintain the spacing between the frame plates. A cone main body that has a spiral groove formed on its outer peripheral surface and two flanges with a hole at the center and a small diameter side end of the inside, and both holes in the two flanges of this cone main body. A flange is formed in the middle part of the cone, and this flange is located in the gap between the two flanges of the cone main body, and is connected to the cone main body so that it can rotate freely and move within a predetermined range. , and a threaded portion is provided on the inner periphery, and the threaded portion includes a connecting core material that is screwed to each end of the separator, and a frame plate presser rod that is attached to the opposite side of the connecting core material to which the separator is attached. Therefore, when removing the wooden cone, as the connecting core rotates, the flange of the connecting core rotates the cone main body using the distance provided between the two flanges of the cone main body. It can be pulled out, after which the connecting core can be removed from the separator. After the wooden cone is removed, the cone hole will follow the outer shape of the cone itself. That is, according to this invention, there is no need to break off the ends of the separator as in the conventional method, so the wooden cone can be easily removed, and damage to the cone hole that may occur when the separator is broken off is avoided. This can be prevented, making it difficult to cause skin plowing caused by mortar that will be filled in in later processes. Furthermore, since the end of the separator protrudes into the wood cone hole, in order to fill the gap between the separator end and the wood cone hole, a prevention plate is used when joining the separator and the wood cone, as in the conventional method. There is no need to provide a seat plate.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view showing how an exposed concrete wall is formed using formwork, Figure 2 is an enlarged cross-sectional view showing a conventional mortar filling structure for cone holes left in the same concrete wall, Figures 3 and 4. FIG. 5 is a sectional view showing an embodiment of this invention in use, and FIG. 5 is a sectional view showing a state in which mortar is filled into a cone hole formed by a wooden cone of the embodiment. In the figure, 4 is a wooden cone, 7 is a spiral groove, 8 is a cone main body, and 9 is a connecting core material.

Claims (1)

[Scope of utility model registration request] When forming concrete walls using formwork,
The wooden cone that is screwed onto both ends of the separator to maintain the spacing between the frame plates forms a frame structure, with a spiral groove formed on the outer circumferential surface, and a spiral groove formed in the center of the interior and at the small diameter side end. A cone main body forming two flanges with holes; a cone main body that is loosely fitted into both holes of the two flanges of the cone main body, and a flange formed in the middle part; The connection is located in the gap between the separators, is connected to the cone main body so that it can rotate freely and move within a predetermined range, and has a threaded part on the inner periphery, and each end of the separator is screwed into this threaded part. A wooden cone for a concrete form, characterized by comprising a core material and a frame plate presser rod attached to the opposite side of the connecting core material to which a separator is attached.