JP2009185533A - Concrete form fastening device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a concrete form fastening device which is easy to handle, correctly mountable on a form plate, and can positively prevent generation of lime wash when concrete is placed, by fixing and intimately sticking a separator cone, a separator shaft, and a mounting bolt, to the form plate. <P>SOLUTION: In a cone body and a plug body constituting the separator cone, a portion of the plug body, on a side on which the plug body is screwed into a female screw portion of the mounting bolt, is formed of: a plug base portion which is almost the same in diameter as a form plate insertion hole formed in the form plate, and has a length in excess of a peripheral edge of the cone body; and a male screw portion which extends from the plug base portion, is smaller in diameter than the plug base portion, and screwable into the female screw portion of the mounting bolt. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a fastening device for a concrete formwork and a separator cone used therefor, and more particularly to an improvement of a separator cone for coupling with a separator shaft.

  Conventionally, as a concrete formwork fastening device composed of a separator shaft and a separator cone, a formwork separator in which screwing portions into which a formwork fixing fastening member is screwed are formed at both ends, A diameter-enlarging portion for preventing the cone from retreating inside the screwed portion, and an engraving for preventing the plate nut from retreating at least at the incomplete screw portion at the end portion on the diameter-enlarged portion side of the screwed portion. There is known a mold separator having a deforming portion, wherein the maximum diameter of the screwed portion and the engraved deforming portion is smaller than the maximum diameter of the enlarged diameter portion (see Patent Document 1) ).

Furthermore, what forms a separator cone | corn by inserting a plug body inside the cone main body which formed the outer surface in the taper shape is known (refer patent documents 2-4).
JP-A-6-49989 JP 55-9917 A Japanese Patent Laid-Open No. 55-39504 Japanese Patent Publication No.59-43626

However, these conventional techniques have the following problems.
(1) In order to ensure uniform thickness, strength, etc. by the mold, the mold plate to which the separator is applied has a plurality of mold plate insertion holes (for example, 7 to 8 in one vertical row). It is necessary to insert separators into these multiple formwork plate insertion holes accurately corresponding to the left and right formwork plates. Such operations as inserting a separator in the hole by mistake were difficult and inefficient.
(2) In order to improve the efficiency of the insertion work, it was also considered to increase the diameter of the mold plate insertion hole, but this method increased the gap between the mold plate insertion hole and the separator, It became the cause of increasing the occurrence of Noro.
That is, when concrete was cast after the mold was assembled, a gap was generated between the separator cone and the mold plate, and noro leaked from the gap. In particular, when rocking with a vibrator, screws and the like were loosened, and a large amount of slack was generated.

(3) A concrete nodule entered the plug body and solidified, which hindered the subsequent pulling of the separator cone. For this, some have a function of preventing the inflow of mortar by the wall portion formed at the end of the plug body, but it is possible to completely prevent the inflow from the gap between the separator shaft and the insertion hole portion. It was difficult, and it was not possible to remove the obstacles when pulling out the separator cone.
(4) In many types of conventional separators, the threaded portion at the tip of the separator hits the mold plate insertion hole of the mold plate and often damages the mold plate insertion hole.
Examples shown in FIGS. 5A and 5B are examples showing such a conventional technique. As shown in the figure, the screw portion 12 abuts on the mold plate insertion hole of the mold plate 10, and in particular, when the work is performed with a wrench or socket attached to an electric drill driver as an attachment tool, the screw is pressed. Since the high-speed rotation in the through-hole, the push-through hole itself was destroyed and the life of the mold was shortened.

The present invention has been made in view of such problems of the prior art, and provides a highly practical concrete formwork fastening device and a separator cone that solve the above problems by devising the configuration of the separator cone itself. It is for the purpose.

This invention is invention regarding the separator cone for solving the said subject, and the concrete formwork fastening apparatus combined using this, Comprising: It has the following structures.
Resin cone body 2, fastening screw portion 5 (male screw portion) that is fitted and locked in the central hole portion of the cone body, and is engaged with female screw portion 8 of mounting bolt 7 at one end, and the like A separator cone 1 comprising a plug body 3 in which an internal thread portion 6 screwed with a thread portion formed at a tip portion of the separator shaft 9 is formed inside the end, and a mounting bolt for the plug body The plug screw base 4 having a length that is substantially the same as the diameter of the mold plate insertion hole 11 formed in the mold plate 10 and has a length exceeding the edge of the cone body. And a separator cone comprising a tightening screw portion 5 (male screw portion) that is smaller in diameter than the plug body base and screwed with the female screw portion of the mounting bolt.
A concrete formwork fastening device comprising the separator cone 1 and a separator shaft 9, further comprising an engaging means for coupling the separator cone and the separator shaft. It is.

According to the present invention, the following effects can be obtained.
(1) The length of the plug body mounting bolt on the side screwed with the female thread portion is substantially the same as the diameter of the mold plate insertion hole formed in the mold plate and exceeds the edge of the cone body. Therefore, the separator can be inserted into the mold plate insertion holes appropriately and smoothly corresponding to the left and right mold plates to which the separator is applied. Therefore, there is no fear of inserting the separator into the adjacent form plate insertion hole, and the work can be performed efficiently. (2) Even when the diameter of the mold plate insertion hole is increased, the separator cone and the separator shaft and the mounting bolt, for example, the foam tie, are firmly fixed and closely attached to the mold body in order to efficiently perform the insertion work. For this reason, it is possible to suppress the occurrence of slack when placing concrete. Furthermore, no flaking occurs when the vibrator is swung.
(3) Since the separator cone, separator shaft and mounting bolt (form tie) are firmly fixed and in close contact with the formwork, there is no intrusion of concrete into the plug body. There will be no hindrance.

(4) The length of the plug body mounting bolt that is substantially the same as the diameter of the mold plate insertion hole formed in the mold plate on the side to be screwed with the female screw portion of the plug body, and exceeds the edge of the cone body Therefore, the threaded portion at the tip of the separator does not hit the mold plate insertion hole of the mold plate, and the mold plate insertion hole is not damaged.
In addition, when attaching a wrench or socket to an electric drill driver as a mounting tool, the screw part does not rotate at high speed in the push-through hole, so the mold plate itself is not destroyed. , Can extend the life of the formwork.
(5) The separator cone having the plug body, the separator shaft, and the mounting bolt (form tie) are each screwed and the concrete formwork is fastened, but the plug body has an appropriate length in consideration of the thickness of the formwork plate. Since the base and the mounting bolt are in contact with each other, the fastening strength of the foam tie is constant, and the mold body is not damaged or damaged by overtightening. For this reason, the mold can be used more times and can last longer.

〔Example〕
Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a partial vertical cross-sectional view showing a one-side portion in a use state of an embodiment of the present invention. In the figure, 1 is a separator cone, 2 is a cone body, 3 is a plug body, 4 is a plug body base part, 5 is a fastening screw part, 7 is a mounting bolt, 8 is a female thread part of the mounting bolt, 9 is a separator shaft, 10 is a formwork board, 11 is a formwork board insertion hole. Then, the concrete mold clamping apparatus is constituted by the separator cone 1 having the plug body and the separator shaft 9 screwed with the separator cone 1.

  As shown in the figure, the mold plate 10 forming the mold has a mold plate insertion hole 11, and the plug body is fitted and locked in the central hole portion of the resin cone body 2 through the insertion hole 11. 3 (plug body base part 4) is inserted between the mounting bolt 7 and the separator cone 1 by screwing the female thread part 8 of the mounting bolt into the tightening screw part 5 formed at the tip part thereof. Tightened and fixed.

  Further, the separator shaft 9 is fastened and fixed by screwing a screw portion formed at the tip end portion of the separator shaft and a female screw portion 6 formed inside the plug body.

  FIG. 2 is a partial longitudinal sectional view showing a one-side portion in a use state of another embodiment of the present invention. In the figure, 1 is a separator cone, and 9 is a separator shaft. The separator cone 1 having these plug bodies and the separator shaft 9 screwed with the separator cone 1 constitute this concrete mold clamping apparatus.

As shown in detail in FIG. 3, the separator cone 1 includes a resin cone body 2 and a plug body 3.
The separator cone 1 includes a resin cone body 2 and a plug body 3 fitted and locked in a central hole portion of the cone body. The plug body 3 is screwed with a female screw portion 8 of a mounting bolt 7 at one end. A fastening screw portion 5 is provided, and a female screw portion 6 to be screwed with a screw portion formed at a tip portion of the separator shaft 9 is provided inside the other end.

Further, the side of the plug body that is screwed with the female thread portion of the mounting bolt is approximately the same diameter as the mold plate insertion hole 11 formed in the mold plate 10, and the edge of the cone main body is The plug body base 4 has a length exceeding, for example, a hexagonal plug body base 4, and is followed by a tightening screw section 5 having a smaller diameter than the plug body base and screwed into the female thread portion of the mounting bolt.
When setting the length of the plug body base, considering the thickness of the mold plate, the length should be set to an appropriate length. It becomes constant. It can also be tightened while adjusting the tightening screw (form tie side). As a result, the formwork body is not damaged or damaged due to overtightening.

To better understand the present invention, a perspective view of the improved separator cone of the present invention is shown in FIG.
The improved separator cone of the present invention has, for example, a hexagonal plug body base 4 having a length exceeding the edge of the cone body on the side screwed with the female thread portion of the mounting bolt of the plug body. Therefore, the separator cone 1 coupled to the separator shaft 9 can be easily and simply attached to the mold plate 10 without damaging the mold plate 10 as in the case of the prior art having a screw portion. It can be inserted into the insertion hole 11.

Further, since the plug body 3 has the plug body base portion 4 having substantially the same diameter as the diameter of the mold plate insertion hole 11 formed in the mold plate, there is a backlash between the plug body 3 and the mold plate insertion hole of the mold plate. In addition to preventing leakage of the slot from the gap between them, the mounting bolt (form tie) can be firmly fixed and can be brought into close contact with the formwork plate surface.
Further, by providing the engaging means 6 for connecting the separator cone 1 and the separator shaft 9, the present concrete formwork fastening device can be obtained.

When using this concrete formwork fastening device, the cone body 2 and the plug body 3 constituting the separator cone 1 are assembled in advance and then fastened to the separator shaft 9.
Thereafter, the tip end portion of the plug body 3 of the separator cone 1 is inserted into the mold plate insertion hole 11 of the mold plate 10, and is fastened and fixed between the mounting bolt 7 and the plug body 3 of the separator cone 1.

  The plug body 3 installed in the separator cone of the present invention has a plug body base portion 4 having a length exceeding the end of the cone body, that is, the plug body base portion 4 in which the plug body protrudes longer than the cone body 2. And the portion of the mold plate that contacts the mold plate insertion hole 11 is the plug body base 4 that is not threaded.

Therefore, unlike the conventional product, since the screw part does not directly contact the mold plate insertion hole of the mold plate, there is no possibility that the mold plate insertion hole of the mold plate is broken or damaged by the screw part. Furthermore, moderate tightening is possible.
Further, the plug body base 4 is preferably one having a square shape so as to be securely tightened by a tool, for example, one having a quadrangular, hexagonal or octagonal shape.

Further, since the separator cone 1 has a long plug body protruding from the cone body 2, that is, the plug body base 4 and the tightening screw portion 5, the mold plate insertion hole of the mold plate has a predetermined form plate insertion hole. It can be inserted easily and reliably.
Moreover, since the plug body has the plug body base 4 having substantially the same diameter as the diameter of the mold plate insertion hole 11 formed in the mold plate, the plug body 3 and the mold plate insertion hole 11 of the mold plate Can be surely inserted into a predetermined formwork plate insertion hole without causing backlash due to the gap.

It is the fragmentary longitudinal cross-section which showed the use condition of the Example of this invention. It is the fragmentary longitudinal cross-section which showed the use condition of the other Example of this invention. It is sectional drawing of the separator cone in the Example of this invention. It is a perspective view of the separator cone in the Example of this invention. It is sectional drawing which shows the use condition of the conventional concrete mold fastening apparatus. It is the elements on larger scale of FIG. 5A.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Separator cone, 2 ... Cone body, 3 ... Plug body, 4 ... Plug body base part, 5 ... Fastening screw part, 6 ... Female thread part of plug body, 7 ... Mounting bolt, 8 ... Female thread part of mounting bolt , 9 ... Separator shaft, 10 ... Form plate, 11 ... Form plate insertion hole, 12 ... Screw part

Claims (3)

A resin cone body (2);
It is fitted and locked in the central hole of the cone body,
And at one end, a tightening screw portion (5) screwed with the female screw portion (8) of the mounting bolt (7),
A separator cone (1) comprising a plug body (3) formed with a threaded portion (6) screwed with a threaded portion formed at the tip of the separator shaft (9) inside the other end. There,
The side screwed with the female thread of the mounting bolt of the plug body is
A plug body base (4) having a length substantially the same as the diameter of the mold plate insertion hole (11) formed in the mold plate (10) and exceeding the edge of the cone body, followed by the plug body base (4). A separator cone comprising a tightening screw portion (5) having a smaller diameter than the plug body base and screwing into the female screw portion of the mounting bolt.   A concrete formwork fastening device comprising the separator cone (1) according to claim 1 and a separator shaft (9).   The concrete form fastening device according to claim 2, further comprising an engaging means for connecting the separator cone (1) and the separator shaft (9).

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