JPH0523714Y2 - - Google Patents

Description

[Detailed description of the invention] "Industrial application field" This invention is a formwork for connecting a separator that maintains the distance between the weir plates of the formwork and a connecting material that fixes it to the thick timber. The present invention relates to a holding coupling device, and particularly to a device for coupling a separator and a coupling shaft passing through a weir plate.

``Prior art'' Conventionally, as a means of connecting separators (round separators) that tighten the weir plates that make up the formwork at predetermined intervals, and tie materials (form ties) that fix them to the end pieces, both ends of the separators were used. A cone is applied that is screwed to the top. The cone is disposed between the weir plates of the formwork together with the separator while being attached to the separator, and is screwed to a connecting shaft (spindle foot) passing through the weir plate while in contact with the weir plate. A tether attached to the connecting shaft is connected to the separator.

"Problems to be Solved by the Invention" By the way, the formwork holding structure using the above-mentioned connecting means (cone) can form concrete with high precision without causing any bulging in the formwork. However, even with this formwork holding structure, there is still room for consideration in the following points, for example.

When a cone is extracted (removed) from a concrete structure after concrete has hardened, it is troublesome to treat the hole left by the cone, for example, by filling it with mortar etc., and the workability is poor.

If the outer periphery of the iron cone is covered with plastic and the cone is buried in concrete, the post-burying process can be omitted, but this is due to the fact that the cone itself is made of metal such as iron. This corrosion causes problems such as cracks in the concrete and staining of the concrete due to rust fluid. In addition, due to deterioration and shrinkage of the plastic covering the concrete periphery, a gap is created between the concrete and the cone, and the separator corrodes due to water intrusion from the outside.

Therefore, as a result of intensive research to solve these problems, the present applicant and others have found that if the cone is made of ceramics, the cone itself will not corrode even if it is buried, and the deterioration of concrete will be prevented. They came up with the idea that it is possible to improve the durability of concrete, prevent water from entering from the outside, and be easy to manufacture.

However, simply replacing the cone material with ceramics instead of conventional metal or plastic would make it difficult to put it into practical use because ceramic cones are brittle against tensile forces. There is a problem.

The object of the present invention is to provide a formwork holding coupling device that can effectively solve the above-mentioned problems, and is a coupling device that has improved applicability to ceramic cones.

"Means for Solving the Problems" The present invention is a formwork holding connecting device that connects a separator that maintains the distance between the weir plates of the formwork and a connecting shaft that passes through the weir plates, comprising: a nut member screwed to the separator and having a thread formed on its outer circumferential surface; a ceramic cone with a partition wall having a screw hole screwed to the coupling shaft; and a ceramic cone inserted into the outer circumference of the cone and having an inner circumferential surface. and a connecting tube formed with a female thread to be screwed into the male thread of the nut member, and the portion of the ceramic cone into which the connecting tube is inserted has a diameter that gradually decreases toward the tip of the cone. It is characterized by an enlarged head with a tapered outer surface.

"Operation" In the connecting device having the above structure, the separator is screwed into a nut member which is a separate member from the ceramic cone, and the nut member is screwed into a connecting tube inserted into the outer periphery of the ceramic cone. Since the cone is integrated with the separator by joining, even if a tensile force is constantly applied to each of the separator and the connecting shaft, the tensile force acting on the separator is transmitted to the nut member and the connecting cylinder, respectively, and the ceramic The force that pulls the cone from the outer periphery toward the separator side, and the tensile force that acts on the connecting shaft is the force that pulls the cone toward the connecting shaft through the screw hole located at the same position as the connecting cylinder of the cone, that is, the enlarged head. becomes. Then, the respective tensile forces act on each other to cause a compressive force to be applied to the cone due to a wedge effect in which the connecting tube is pushed open by the tapered enlarged head. Therefore, the tensile force that causes cracks and splits in the ceramic cone is hardly generated. Furthermore, by tightening the nut member to the connecting cylinder, a compressive force will be applied to the cone in the connecting cylinder, so that the compressive force will be greater than the compressive force generated in the cone against the tensile force generated in the separator and the connecting shaft. This can improve the yield strength of the cone.

"Embodiment" Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. In these figures, reference numeral 1 is a connecting device used for concrete form forming, and the connecting device 1 includes a nut member 2, a ceramic cone 3 with a partition wall 3a, and a connecting device inserted into the outer periphery of the cone 3. It is mainly composed of a connecting cylinder 4 that connects the nut member 2 and the cone 3 together.

Next, to explain these in detail, the nut member 2 is a separator (round separator) with a male thread 6a that maintains the distance between the weir plates 5 of the formwork.
6 is screwed together, and the screw hole 2a thereof is formed in a cylindrical shape that penetrates in the axial direction, and a flange portion 7 that comes into contact with the peripheral edge of the connecting tube 4 protrudes from the outer peripheral surface of the nut member 2. At the same time, an external thread 8 is formed.

The ceramic cone 3 has a connecting shaft 1 screwed to one end of a form tie 9.
0 is screwed into the insertion hole 11 of the coupling shaft 10.
A small diameter and elongated cylindrical part 12 formed with a cylindrical part 12 and a male thread 10a of a coupling shaft 10 formed coaxially with the cylindrical part 12 and having a larger diameter than the cylindrical part 12 and on the inner periphery.
An enlarged head 14 formed with a screw hole 13 to be screwed into the
The top plate portion of the enlarged head 14 constitutes the partition wall 3a. In the case of the embodiment, the outer circumferential surface of the enlarged head 14 is formed in a tapered shape that becomes smaller in diameter as it approaches the cylindrical portion 12, and the connecting cylinder 4 is provided on the outer periphery of the enlarged head 14. It is now being inserted. Note that a flange portion 25 that comes into contact with the weir plate 5 is provided around the outer periphery of the tip of the cylindrical portion 12 .

The connecting cylinder 4 that connects the nut member 2 and the cone 3 is inserted into the outer periphery of the enlarged head 14 of the cone 3, and is made of metal and has a cylindrical shape that is longer than the enlarged head 14. It is formed in the shape of Further, a locking flange portion 15 that engages with the enlarged head 14 is provided on the inner peripheral surface of one end side (left side in the figure) of this connecting cylinder 4, and a nut member 2 is provided on the inner peripheral surface of the other end side.
A female thread 16 is formed to be screwed into the male thread 8 of.

In addition, to supplement the explanation regarding the connecting material 9, it is said that the separator 6 is connected to the seat plate (wood seat) 2.
It is fixed to a thick end material (steel pipe) 21 on the top of the pipe with a washer 22. A male thread 9a is provided on the outer circumferential surface of one end of this connecting member 9 for screwing together a nut 23 for fixing the washer 22, and a screw hole into which the coupling shaft 10 is inserted is opened at the other end. A male thread 10b on the other side of the coupling shaft 10 is attached to the inner circumferential surface of the coupling shaft 10.
It has a structure in which a female thread 9b is formed to be screwed into.

Next, the operation of this embodiment configured as above will be explained.

To assemble the formwork, first connect the connecting device 1.
With the main members (nut member 2, ceramic cone 3, and connecting tube 4) assembled, the nut member 2 of the connecting device 1 is screwed onto the male thread 6a of the separator 6, and then the weir plates 5 are screwed together. As shown in the drawing, between these weir plates 5 arranged oppositely,
The separator 6 is provided. At this time, by relatively rotating the separator 6 and the nut member 2, the position of the coupling device 1 is moved and fine adjustment between the weir plates 5 is performed.

Then, the insertion hole 9 of the cone 3 of the connecting device 1
Insert the coupling shaft 10 through the weir plate 4, screw the male thread 10a of the coupling shaft 10 into the screw hole 13 at the back of the insertion hole 11, and then attach the connecting material 9 to the male thread 10b at the other end of the coupling shaft 10. are screwed, and this connecting material 9 is attached to the thick material 21 from above the seat plate 20 with the washer 2.
2, it will be in the assembled state shown in the drawing.

In the coupling device of this embodiment, the separator 6 is configured to be screwed into the nut member 2 which is a separate member from the ceramic cone 3, and the nut member 2
is integrated with the cone 3 by screwing it to the connecting cylinder 4 inserted into the outer periphery of the ceramic cone 3, so that the separator 6 and the connecting shaft 1
Even if a tensile force is constantly applied to each of the separator 6, the tensile force acting on the separator 6 is transmitted to the nut member 2 and the connecting cylinder 4, and is transferred from the outer periphery of the ceramic cone 3 to the separator 6 side. Moreover, the tensile force acting on the joint shaft 10 becomes a force that pulls the cone 3 from the back toward the joint shaft. Furthermore, even if a tensile load is applied to the joint shaft 10, the wedge effect of the enlarged head 14 prevents the compressive load from acting on the enlarged head 14 and the cylindrical part 12 as a whole. Therefore, the tensile force that causes cracks and splits in the ceramic cone 3 is hardly generated.

Note that by tightening the nut member 2 to the connecting tube 4, a compressive force is applied to the enlarged head 14 of the cone 3 located inside the connecting tube 4, so that the compressive force is applied to the threaded portion of the cone 3, that is, By canceling out the tensile force generated at the screw hole 13, the yield strength of the ceramic cone 3 can be further improved.

Since the cone 3 is considerably lighter than metals such as iron, it has the advantage of being easy to handle when installing the separator 6, etc. Furthermore, the cone 3 has the advantage of being easy to handle when installing the separator 6, etc. Since the nut member 2 and the connecting tube 4 made of metal are buried with appropriate coverage by the small diameter and long cylindrical portion 12 of No. 3, deterioration of the concrete due to corrosion of the nut member 2 and the connecting tube 4 is avoided. can be prevented. Further, after the formwork is dismantled, a ceramic cap is attached to the insertion hole 11 of the ceramic cone 3 to prevent water from entering the insertion hole 11. Since the ceramic cone 3 is formed with the partition wall 3a, water does not enter the separator 6.

Further, in the present invention, the shapes of the nut member 2 and the cone 3 are not limited to those shown in the drawings, and for example, a rib or the like may be provided on the outer periphery of the cone 3 to prevent the nut from coming off. Further, although not shown in the embodiment, in order to ensure water stoppage from the outer periphery of the cone 3, etc., it goes without saying that an intumescent rubber or the like is provided on the outer periphery of the cone.

In addition, in the present invention, since the cone 3 is usually formed mainly from alumina raw material (white),
Although the cone 3 has a white appearance, it can be colored by mixing a metal pigment into the raw materials. In addition, we are currently conducting extensive research to further clarify the details of the type of pigment used to color the cone 3 in a gray color.

"Effects of the Invention" As explained above, the present invention provides the following excellent effects.

(a) Since the cones that correspond to the weir plates are made of ceramics, corrosion will not occur in the concrete even if the cones are buried, and the nut members and connecting tubes can be properly covered by the cones. Since the concrete is buried in the given state, it is possible to prevent the concrete of the concrete structure from deteriorating after forming. Further, since the ceramic cone has a structure including a partition wall, it is possible to reliably prevent water from entering from the outside through the insertion hole of the coupling shaft, and corrosion of the separator can be prevented.

(b) The separator is configured to be screwed into a nut member that is a separate member from the ceramic cone, and the nut member is integrated with the ceramic cone by being screwed into a connecting tube inserted into the outer periphery of the cone. Therefore, even if a tensile force is constantly applied to each of the separator and the connecting shaft, the outer periphery of the expanded ceramic cone head is tapered, so there is no wedge effect that tries to push the connecting cylinder apart. Compressive force acts on the ceramic cone, and almost no tensile force occurs, which is the cause of cracks and splits. Furthermore, by tightening the nut member to the connecting cylinder, compressive force is applied to the cone within the connecting cylinder, so that the yield strength of the cone can be further improved.

(c) As described above, since compressive force is mainly applied to the ceramic cone, the applicability of the ceramic cone to practical use can be improved.

[Brief explanation of drawings]

The drawing is a sectional view showing an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Connecting device, 2... Nut member, 3... Ceramic cone, 3a... Partition wall, 4... Connection cylinder, 5... Weir plate, 6... Separator, 8... Male thread, 9... Connecting material, 10... Connection shaft, 11...
...Insertion hole, 12...Cylindrical part, 13...Screw hole, 1
4... Enlarged head, 15... Locking flange part, 16
... Female thread, 21 ... Thick material, 22 ... Washer, 2
3...Natsuto.

Claims (1)

[Scope of utility model registration request] A formwork holding connecting device that connects a separator that maintains a distance between weir plates of a formwork and a connecting shaft that passes through the weir plate, which is screwed to the separator and has a thread formed on the outer peripheral surface. a ceramic cone with a partition wall and having an insertion hole for the coupling shaft and a screw hole for screwing the coupling shaft at the back of the insertion hole; and a connecting tube formed with a female thread to be screwed into the male thread of the nut member, and the portion of the ceramic cone into which the connecting tube is inserted has a diameter that decreases toward the tip of the cone. A formwork holding coupling device characterized by having an enlarged head with a tapered outer surface.