JPH0639846B2 - Formwork holding connection device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a device for connecting a separator and a cone, which keeps a space between dam plates of a formwork.

"Prior Art" Conventionally, a means for connecting a separator (round separator) for fastening a dam plate constituting a formwork at a predetermined interval and a tie material (foam tie (registered trademark)) for fixing this to a thick end material. As a cone applied to both ends of the separator is applied. FIG. 7 shows an example of the structure of such a cone. The cone A has a basic structure in which it is mounted between the separators 5 and the separators 5 between the dam plates 4 of the formwork. In order to connect the connecting member 10 attached to the connecting shaft 11 to the separator 5, the connecting member 10 is screwed to the connecting shaft (shaft foot) 11 penetrating the weir plate 4 while being in contact with the connecting plate 4. Has become. After the concrete is poured, the concrete structure C is removed, and the holes are filled with mortar or the like to carry out the water stop treatment.

"Problems to be Solved by the Invention" By the way, the mold holding structure using the connecting means (cone) can accurately form concrete without causing any squeezing in the mold. However,
Even with this form holding structure, there is room for consideration, for example, in the following points.

If the cone is pulled out (removed) from the concrete structure after the concrete has hardened, it is necessary to fill the trace holes in the cone with, for example, mortar.
That work is troublesome. Moreover, even if such a trace filling operation is performed, permeated water may enter the gap between the mortar and the concrete, and the metal separator embedded in the concrete structure may be corroded to deteriorate the concrete. In particular, in places where the deterioration of concrete due to carbonization of concrete due to permeated water containing salt or outside air containing salt from the surface of the concrete structure is to be prevented, metal parts should be placed within the normal rebar cover size. Since there is a restriction that a space (for example, a spacer, a separator, etc.) should not be provided, the trace hole of the cone becomes large and deep, the work of filling the trace hole becomes troublesome, and the cost becomes high.

If the structure is such that the outer circumference of the iron cone is covered with plastic, and the cone is buried in the concrete, the step of filling the trace can be omitted, but the cone itself is made of metal such as iron. Corrosion caused by the corrosion, concrete cracks due to the corrosion, and stains on the concrete due to rust. Also, due to deterioration or shrinkage of the plastic that covers the outer circumference of the cone, a gap is created between the concrete and the cone, and the separator corrodes due to the intrusion of water from the outside.

The present invention has been made in view of the above circumstances, and the purpose thereof is to completely cover the tip of the separator so that it is not necessary to use an expensive waterproofing agent and the mortar or a simple cap of the cone It is an object of the present invention to provide a connection device for holding a formwork, which can perform treatment of pits, can sufficiently remove the covering of the separator, has a water blocking effect, and can prevent corrosion of the separator with a simple structure.

"Means for Solving Problems" Therefore, the present invention mainly comprises a covering cylinder of a bottomed cylinder which covers the separator tip and is embedded in the cast concrete, and the covering cylinder is It is made of a material having high corrosion resistance such as ceramics, and further, a female screw to be screwed to the male screw of the separator is formed on the inner circumference of the covering cylinder, and a female screw of the cone is screwed on the outer circumference of the covering cylinder. It is characterized in that a male screw to be fitted is formed.

"Operation" The coupling device of the above configuration, the cover cylinder made of a material having a high corrosion resistance is screwed to both ends of the separator and the cone is screwed to the outer periphery of the cover cylinder, and the connecting material is connected to the cone. , The separator is attached to the thick material for use. In this assembled state, even if a load as a tensile force acts on each of the separator and the cone, the tensile force that acts on the separator becomes a force that pulls the coating cylinder from the inner circumference of the coating cylinder toward the separator, and ,
Since the tensile force acting on the cone is a force that pulls it from the outer circumference of the covering cylinder to the connecting material side, the tensile forces of the inner peripheral portion and the outer peripheral portion act on each other to mainly generate a shearing force in the covering cylinder, Therefore, the tensile force that causes cracks and breakage is hardly generated in the coated cylinder made of a material having high corrosion resistance such as ceramics.

On the other hand, after pouring concrete, if the cone is removed, the covering cylinder is exposed in the trace hole, so as a treatment for the trace hole, water stop treatment is performed by a simple means such as filling with mortar or covering with a plastic cap. be able to. That is, since the tip end of the separator is covered by the covering cylinder and is buried in a state where the structure surface is sufficiently covered, the covering cylinder itself that does not corrode and is exposed in the trace hole is Since it is formed of a corrosion-resistant material, corrosion in the concrete structure does not occur, and deterioration of the concrete can be prevented.

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1 to 3. In these drawings, reference numeral 1 is a connecting device used for forming a concrete mold frame.
Is mainly composed of a coated tube 2 made of a material having high corrosion resistance such as ceramics.

The covering cylinder 2 connects a metal cone 3 and a separator (round separator) 5 with a male screw 5a for holding a space between the dam plate 4 of the form, and the whole tip of the separator 5 is It forms a bottomed cylinder for coating. An insertion hole 6 into which the separator 5 is inserted is formed on the inner circumference of the covering cylinder 2.
And a female screw 6a which is screwed to the male screw 5a of the separator 5 is formed on the inner peripheral surface of the insertion hole 6 on the back side. On the outer peripheral surface of the covering cylinder 2, a male screw 7 to be screwed into the female screw 13a of the cone 3 is formed and a peripheral groove 8 is provided. A packing 9 made of is attached.

The cone 3 that is screwed to the outer circumference of the covering cylinder 2 is one in which a connecting shaft (shaft foot) 11 screwed to one end of a connecting material (form tie (registered trademark)) 10 is screwed, and is made of steel or the like. It is made of metal, and its outer peripheral surface 3a is tapered so that its diameter becomes smaller toward the separator 5 side. A screw hole 12 into which the male screw 11a of the coupling shaft 11 is screwed is formed in the top plate portion 3b of the connecting cylinder 3 in a state of penetrating in the axial direction. On the other hand, an insertion hole 13 for inserting the covering cylinder 2 coaxially with the screw hole 12 is provided on the inner peripheral surface of the cone 3, and the male screw 7 of the covering cylinder 2 is formed on the inner peripheral surface of the insertion hole 13. A female screw 13a to be screwed is formed. Further, a concave groove 14 is formed in the top plate portion 3b of the connecting cylinder 3 concentrically with the screw hole 12, and an inner peripheral wall 14a of the concave groove 14 is
As shown in FIG. 3, it is formed in a hexagonal shape that fits into the box spanner.

In addition, supplementary description of the tie material 10,
This is to fix the separator 5 to a thick end material (steel pipe in this embodiment) 16 on a seat plate (wooden seat) 15 via a washer 17. A male screw 10a for screwing a nut 18 for fixing a washer 17 is provided on the outer peripheral surface on one end side of the connecting material 10, and a screw hole into which the coupling shaft 11 is inserted is opened on the other end side. ing.

In FIG. 2, reference numeral 20 indicates a cap fitted in the hole after the connecting cylinder 3 is removed.

Next, the operation of the present embodiment configured as above will be described.

As the work of assembling the mold, first, the covering cylinder 2 is screwed into the male screw 5a of the separator 5, the cone 3 is screwed to the outer periphery of the covering cylinder 2, and then the dam plates 4 are arranged so as to face each other. Between these dam plates 1, as shown in FIG.
The separator 5 is provided.

Then, the weir plate 4 is provided in the screw hole 12 of the cone 3 of the connecting device 1.
When the connecting shaft 11 is screwed through, the connecting member 10 is screwed to the other end of the connecting shaft 11, and the connecting member 10 is fixed to the thick end material 16 from above the seat plate 15 using the washer 17, the drawing It will be in the assembled state shown in.

In the coupling device of the present embodiment, the separator 5 is screwed into the inner part of the covering cylinder 2, and the covering cylinder 2 is screwed and integrated with the metal cone 3, so that the separator 5 and the connecting member are combined. When a load as a tensile force is applied to each of the shafts 11, the tensile force acting on the separator 5 is
It becomes the force to pull this to the separator 5 side from the inner peripheral part of
Further, the tensile force acting on the coupling shaft 11 is transmitted to the cone 3 and becomes a force that pulls it from the outer peripheral portion of the covering cylinder 2 to the coupling shaft 11 side, so that the respective tensile forces on the inner peripheral portion and the outer peripheral portion are The tensile forces that act on each other to generate a shearing force in the coated cylinder 2 and cause cracks or divisions in the coated cylinder 2 are hardly generated.

Since the separator 5 is screwed into the inner part of the covering cylinder 2, a load as a shearing force acts on the entire covering cylinder 2, and the covering cylinder 2 is made of ceramics against the shearing force. If it is manufactured, it will exhibit sufficient proof stress.

After the concrete is set and hardened, the dam plate 4, the connecting material 10, the connecting shaft 11, the thick end material 16 and the like are disassembled, and the cone 3 is removed from the outer periphery of the covering cylinder 2 using a box spanner. This cone 3
Since the outer peripheral surface 3a of the cone 3 is formed in a tapered shape, it can be easily removed from the concrete structure C. Then, if the cap 20 is fitted into the hole in which the cone 3 has been removed, as shown in FIG. 2, the water-stop treatment is performed. In this state, the separator 5 is covered with the ceramic covering tube 2 in a state of being buried in the concrete structure C, and is embedded with a proper covering, so that the separator 5 does not corrode. Moreover, since the coated cylinder 2 itself exposed in the trace hole is formed of a material having a high corrosion resistance, for example, ceramics, corrosion in the structure C does not occur, and deterioration of concrete can be reliably prevented. it can.

In addition, since the cap 20 prevents the water from penetrating from the trace hole, the separator 5 is covered by the bottomed cover cylinder 2, and the water passage to the separator 5 is cut off by the packing 9, so that the water leakage is surely prevented. It has the advantage that It should be noted that if water-expanded rubber or the like is used as the packing 9, there is an advantage that a high waterproof performance can be secured.

In the above-mentioned embodiment, the cap is used as the water-stop treatment means for the trace holes.
Although the method according to 20 is applied, the present invention is not limited to the means of this embodiment, and may have a structure in which, for example, mortar or the like is filled. Further, when the mortar is filled, the screw 7 is formed on the outer periphery of the covering cylinder 2, so that the mortar does not easily come off, and in the case of the cap 20 as in the embodiment, the male screw 7 is used. There is an advantage that this can be firmly attached.

4 and 5 show another embodiment of the present invention. Instead of the cone 3 shown in FIG.
An inner cylinder 32 having a screw rod 30 with which the connecting material 10 is screwed at the left end of the drawing and a screw hole 31 with which the covering cylinder 2 is screwed at the other end, and a taper fitted on the outer periphery of this inner cylinder 32. A cone 35 including a tube 33 is screwed onto the outer circumference of the covering cylinder 2.

It is needless to say that the cone 35 having such a structure also has the same effects as those of the previous embodiment.

Further, FIG. 6 shows another embodiment of the present invention.
Instead of the cone 3 shown in the figure, one end (left end in FIG. 6)
An inner cylinder 42 having a first screw hole 40 into which the coupling shaft 11 is screwed and a second screw hole 41 into which the covering cylinder 2 is screwed into the other end; A cone 45 formed of a tapered tube 43 fitted on the outer circumference is screwed onto the outer circumference of the covering cylinder 2.

Even with the cone 45 having such a configuration, the same effect as that of the first embodiment can be obtained.
In the present invention, the configuration of the cone is not limited to that of each embodiment, and the configuration is arbitrary.

"Effects of the Invention" As described above, the present invention has the following excellent effects.

(a) By covering the tip of the separator with a coating cylinder made of a material having a high corrosion resistance such as ceramics, and removing the cone after the concrete is set and cured, the separator can be embedded with a proper covering applied. ,
Corrosion of the separator can be prevented with a simple structure, and water blocking treatment of the trace holes can be performed by filling with mortar or a simple cap or the like, which simplifies the process. Especially since the tip of the separator is completely covered by the covering cylinder,
It is not necessary to use an expensive waterproofing agent, and the cost can be reduced. Moreover, since the male thread is formed on the outer circumference of the covering cylinder, the mortar, the cap, etc. for the hole treatment are not easily removed, and it is possible to firmly attach them.

(b) Since the covering cylinder covering the separator is entirely made of a material having high corrosion resistance such as ceramics, the covering cylinder does not corrode in the concrete, and the deterioration of the concrete can be prevented.

(c) Since the separator is attached to the inner circumference of the covering cylinder and the cone is screwed to the outer circumference of the covering cylinder, even if a load as a tensile force acts on each of the separator and the cone during mold forming, Since these tensile forces act on each other to generate shearing force mainly in the coated cylinder, the tensile force that causes cracks and divisions is hardly generated in the coated cylinder, and the coated cylinder is damaged. There is no danger of doing so. Further, this makes it possible to reduce the wall thickness of the coated cylinder, minimize the amount of material used, and reduce the cost.

[Brief description of drawings]

1 to 3 show an embodiment of the present invention,
FIG. 1 is a vertical cross-sectional view showing a state in which a cone and a connecting device are assembled, FIG. 2 is a vertical cross-sectional view after placing concrete, FIG. 3 is a front view of a connecting cylinder, and FIGS. FIG. 6 is a longitudinal sectional view showing another embodiment of the invention, FIG. 6 is a longitudinal sectional view showing another embodiment of the present invention, and FIG. 7 is a longitudinal sectional view showing one structural example of a conventional cone. is there. 1 ... Coupling device, 2 ... Ceramic coating cylinder, 3 ...
Cone, 4 ... Dam plate, 5a ... Male screw, 5 ... Separator, 6 ... Insert hole, 6a ... Female screw, 7 ... Male screw, 8 ...
… Circumferential groove, 9… Packing, 10… Connecting material, 11… Coupling shaft, 12… Screw hole, 13… Insert hole, 13a… Female screw, 14
...... Concave groove, 14a ...... Inner peripheral wall, 15 ...... Seat plate, 16 ...... Thick material (steel pipe pipe), 17 ...... Washer, 18 ...... Nut, 20 ...... Cap.

Front page continuation (72) Hiroyuki Arai Inoue Hiroyuki Arai 2-6-21 Yaesu Chuo-ku, Tokyo Rose Bay Yaesu Building Ishikawajima Kenzai Kogyo Co., Ltd. (72) Inventor Hideo Matsuyama 832-3-1 Takatsu, Yachiyo-shi, Chiba 7-404 (72) Inventor Keiichi Abe 51-1 Irifune, Urayasu City, Chiba Prefecture

Claims (1)

[Claims] 1. A device for connecting a separator and a cone for holding a space between dam plates of a formwork, said connecting device comprising:
Mainly composed of a cover cylinder of a bottomed cylinder that covers the separator tip portion and is embedded in cast concrete, and the cover cylinder is formed of a material having high corrosion resistance such as ceramics, Further, a female screw to be screwed to the male screw of the separator is formed on the inner circumference of the covering cylinder, and a male screw to be screwed to the female screw of the cone is formed on the outer circumference of the covering cylinder. Formwork holding connection device characterized by the above.