JPH0122855Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Field of Application> The present invention relates to a separator fixing device for concrete formwork, and particularly to improvements in its finishing type.

<Conventional technology and its problems to be solved> For example, in the construction of beam formwork for concrete buildings, when tightening the formwork, two separators, upper and lower, are fixed horizontally between the weir plates of the formwork. However, after the separator at the upper position is fixed horizontally, this becomes an obstacle and it is not possible to place reinforcing bars inside the formwork. A structure is adopted in which the components are made separately in advance and then combined as shown in FIGS. 1 to 3.

In other words, a cone with a pivot foot 1 and a ring hardware 3
The pivot foot 1 of the cone 2 is passed through the weir plate 4 of the formwork M, and is fastened from the outside of the weir plate 4 with a form tie 5. A U-bolt-shaped separator 6 is inserted into the ring hardware 3 so that it is later suspended horizontally, and a nut 7 is screwed onto both ends of the screw to prevent the separator 6 from lifting up or coming off. .

However, in this case, the separator 6
Since it has a special U-bolt shape, not only is it expensive and takes a long time to deliver, but also due to the expansion pressure of the concrete poured in the formwork M when it is fixed horizontally. The bent corner portion of the separator 6 is likely to be improperly expanded outward and deformed to form an obtuse angle as shown by the chain line in FIG. Due to the presence of the bent corner portion, the tensile strength is poor.

Second, since the ring metal fitting 3 is screwed into the cone 2 as if it were an addition, it is necessary to manufacture and prepare both parts separately, and the combination operation such as adding them is also troublesome, and it is difficult to fit the mold M into the cone 2. In the fixed state, this protrudes inward from the weir plate 4 for a long time, which tends to cause problems in the arrangement of reinforcing bars.

Thirdly, after the formwork M is dismantled, it is necessary to remove the cone 2 from the hardened concrete, and the remaining void after its removal must be backfilled with mortar 8, etc., as shown in Figure 3. There must be.

Fourthly, in order to prevent the separator 6 from lifting up or being pulled out, it is necessary to tighten nuts 7 at both ends of the screw.
When it is necessary to screw together, the ring metal fitting 3 is screwed into the cone 2 with the pivot foot 1 and rotated as if connecting, as described above, while the separator 6 itself has a special U-bolt shape. Because of this, both ends of the screw must be inserted into the ring hardware 3 and then the nut 7 must be screwed thereon, making the on-site work extremely complicated.

In this respect, the Utility Model No. 59, which corresponds to the prior art of the present invention,
According to the structure of No. 48959, these problems may be solved for the time being, but regarding the last problem mentioned above, the lifting of the separator,
It is still impossible to completely prevent this.

That is, in the case of the prior invention, the main body 2 of the separator fixture 1 is formed with a pair of left and right separator holding pieces 4, 4 having a spacing slightly smaller than the diameter of the separator shaft 21a.
Although the shaft portion 21a of the separator 21 is thereby held between the holding pieces 4, 4, the holding pieces 4 do not hold the separator shaft portion 21a due to the wedge action as a shape characteristic.
The pair of holding pieces 4, 4 that protrude inward from the shaft insertion part 3a of the recess 3 are formed in a so-to-speak fully open state on the upper surface with uniform intervals, depending on the material properties of the synthetic resin itself or the separator shaft. This is a configuration in which the clamping action is performed only by the size relationship with the portion 21a.

Moreover, since the recess 3 that receives the shaft portion 21a and head 21b of the separator 21 is in the form of a saucer with an open top, the poured concrete will accumulate in the recess 3.
The separator 21 easily lifts up and leaves the depression 3 due to the pushing force exerted by the concrete at that time.

This means that even if the shaft portion 21a or the head portion 21b of the separator 21 is forcibly fitted into the temporary recess 3, as explained as a separate structure in the text of the prior invention, the above-mentioned material characteristics or dimensions This cannot be completely prevented as long as the configuration depends only on the size relationship between the two. On the contrary, the more the degree of forced fitting increases, the more the separator 21
It becomes difficult to push the material into the recess 3 and manipulate it, which impedes the workability.

Furthermore, although the prior design states that the fixture 1 may be attached to the formwork 12 with the upper opening of the recess 3 facing sideways, it is not possible to install the fixture 1 in the sideways or downward open position. If this occurs, the separation phenomenon of the separator 21 will occur more significantly. This is because, as mentioned above, the separator holding pieces 4, 4 in the recess 3 are formed in a fully open state with the upper surface portion having a uniform interval.

In order to prevent this, in the previous design, pieces 10, 10 for preventing rotation with the formwork 12 are formed on the connecting shaft 8 of the fixture 1, and without these pieces, separation of the separator 21 would be completely prevented. Can not do it. Therefore, it is also necessary to process the rotation prevention pieces 10, 10, which results in increased costs.

In this respect, as suggested in the text of the prior invention, in order to prevent the separator 21 from coming off, instead of the holding pieces 4, 4, a pair of protruding pieces protruding from the main body 2 may be penetrated with nails, or a notch may be used. If a rotary plate having a rotary plate with
Not only is it expensive, but it also requires special operations such as piercing a nail and rotating a rotary plate, which is clearly disadvantageous as a separator fixing tool that is used in large quantities.

<Means for Solving the Problems> The present invention is designed to fundamentally solve these problems, and for this purpose, it is designed to connect the pivot foot for attachment to the concrete formwork from the base end of the fixing tool body. In addition to protruding integrally, a deep and wide top-opening groove is provided approximately in the middle of the main body to receive the large-diameter head at the end of the separator. In particular, a separator fixing tool is provided with a shallow and narrow recess with an opening at the top that is to receive the recess. The separator is arranged at the tip of the main body in an almost V-shape when viewed from the front, symmetrical about the vertical center line, and is correctly received and guided into the recess by the forced expansion deformation of both of its elastic wedges. The device is characterized in that it is set so that it cannot be automatically removed from the recess by the restoring deformation of the wedge.

<Example> Hereinafter, the specific structure of the present invention will be described in detail based on the illustrated example.
The main body of the fixing device is integrally injection molded from a high-strength synthetic resin, especially a polyamide type resin such as 66-nylon or 6-nylon with glass fiber, and the top surface is horizontally flat as a whole. It has a circular shape. Of course, this may be colored, and its overall length L should be as short as possible so that it does not protrude excessively inward from the weir plate 11 of the formwork M. is good.

Reference numeral 12 denotes a pivot foot for attachment to the formwork M, which is in the form of a bolt with an overhanging collar 13, and the overhanging collar 13 having a large diameter is embedded and integrated in the base end of the main body 10. . Reference numeral 14 denotes a concave circumferential line for a breakage guide carved at the base of the shaft foot 12 protruding from its base end, so that after the formwork M is dismantled,
The broken shaft leg 12 can be accurately and easily removed from the position where the concave circumferential strip 14 is provided, and subsequent finishing work can be performed with high efficiency. Reference numeral 15 denotes a groove formed in the middle part of the main body 10, and has a deep and wide upper opening shape. This groove 15
functions to receive the large diameter head 17 of the separator 16 in a buried state.

In the case of the illustrated example, a large diameter nut is shown as the large diameter head 17 screwed into the threaded portions at both ends of the separator 16, but in addition to the nut, a washer may also be inserted into the separator 16. Alternatively, large-diameter heads may be integrally extended to both ends of the separator 16. Furthermore, although the inner bottom surface of the groove 15 is shown as a concave curved surface in the illustrated example, it may of course be formed as a horizontal flat surface as long as the large diameter head 17 can be accommodated therein.

Reference numeral 18 denotes a shallow and narrow top-opening recess formed at the distal end of the main body 10 for receiving the separator 16 itself. The relationship is set such that the protruding pivot foot 12 is located on the same axis line P-P. Therefore, even if a tensile force along the axis PP is applied, there is no fear that the main body 10 will be improperly bent and deformed, and excellent tensile strength as a whole with the separator 16 can be exhibited.

The inner bottom surface of the recessed notch 18 is a concave curved surface that almost matches the circumferential surface of the separator 16, and its depth is also determined to be shallower than that of the recessed groove 15, so that the inner bottom surface of the main body 10 A certain height difference 19 is created at the boundary between the intermediate part and the tip, and this allows the large diameter head 17 of the separator 16 to engage with the tip and come out in the axial direction. Never.

Reference numeral 20 designates a pair of left and right fulcrum ears provided at the tip of the main body 10, which stand up a certain height H higher than the top surface of the intermediate portion. Numeral 21 is a pair of left and right elastic wedges that are continuously extended and project obliquely downward from the ear piece 20, and the lower tips thereof are close together so as to always close the upper part of the opening of the recess 18. As a result of this, the concave part 1
To properly guide a separator 16 into an interior of a separator 8 and to surely prevent the separator 16 from floating up after being received.

A wedge space S that is approximately V-shaped when viewed from the front or the front is defined between the opposing wedge claws 21, and the separator 16 is artificially pushed into this space S from above. At this time, the wedge claws 21 are forcibly expanded and deformed to correctly pass the separator 16 into the recess 18 directly below it in a falling guide shape, and are then restored and deformed to restrain the separator 16.

In other words, both wedge claws 21 are connected to the vertical center line Y of the notch 18.
- Y, it is oriented in a symmetrical shape so as to create an almost V-shaped wedge space S when viewed from the front, and it is elastically deformed with the ear piece 20 serving as the base of the projection as a fulcrum. It's getting old. In order to facilitate the expansion action, the distal end of the main body 10 has a concave notch 18 continuous with the notch 18.
A pair of left and right wedge pawl relief notches 22 facing each other in a substantially L-shape are also stepped.

As mentioned above, the upper opening width of the recess 18 is substantially equal to the diameter dimension d of the separator 16, the upper opening width in the V-shaped wedge space S is larger than the diameter dimension d, and the lower opening width is also larger than the diameter dimension d. On the contrary, it is of course smaller, and therefore, the separator 16 once inserted into the wedge space S is held by both wedge claws 21 in its natural state.

In that case, as for the depth W of the wedge space S, the wedge claw 21 is connected to the fulcrum ear piece 2 as shown above.
It is preferable to set the depth to be larger than the diameter dimension d of the separator 16 by extending the depth from zero. Furthermore, the V-shaped intersection angle θ of the wedge space S is preferably set to an acute angle of 45 degrees or less as shown in the figure.

That is, the elastic wedge 21 can be optimally elastically deformed without being thinned due to its strength, and the separator 16 can be held stably once in a so-called completely buried state in the wedge space S defined thereby. In order to continue pushing the separator 16 smoothly, insert the wedge claw 21 into the main body 1.
From a pair of fulcrum ears 20 that stand up by a certain height H from the flat top surface of the middle part in 0 and protrude from the tip, the fulcrum ears 20 are continuously projected and extended while pointing diagonally downward. A relief notch 22 is also formed at the tip. This will further improve the workability of pushing the separator 16.

Note that FIGS. 13 to 15 show modified examples of the present invention, but since the configuration is substantially the same as the basic example described above, FIGS.
The detailed explanation will be omitted except for writing the corresponding reference numerals with those in the figure.

<Operation> When tightening the concrete form M using the present invention configured as described above, steps 9 to 1 are performed.
As shown in FIG. 1, the pivot foot 12 protruding from the base end of the fixture body 10 is passed through the weir plate 11 of the formwork M, and the form tie 23 is inserted into the threaded portion of the pivot foot 12 from the outside of the weir plate 11. By entering into this agreement,
First, the main body 10 is installed and fixed inside the weir plate 11 in a symmetrical arrangement, and after arranging reinforcing bars (not shown) in the formwork M, large diameter heads 17 such as nuts are provided at both ends. A straight shaft type separator 16 is fixedly suspended horizontally between the two main bodies 10.

That is, the separator 16 is inserted into the V-shaped wedge space S in the main body 10 from above as indicated by the arrow in FIG. The separator 16 is struck and forced downward as shown by the solid line in the figure.

Then, the wedge claw 21 holding the separator 16 expands and deforms as shown in FIG.
Similarly, the large-diameter head 17 instantly falls into the groove 15 of the main body 10 and is properly received, and the raised part of the separator 16 is restored and deformed by the wedge claw 21. , and the movement along the axial direction is caused by the large diameter head 1 relative to the tip.
7, each is completely prevented.

After the concrete poured in the formwork M has hardened, the weir plate 11 is removed as shown in Fig. 10.
The pivot foot 12 protruding from the concrete surface is hammered, broken off from its base, and finished. In other words, the fixing tool of the present invention is used for finishing purposes.

<Effect of the invention> As described above, in the present invention, the pivot foot 12 for attaching to the concrete formwork M is integrally projected from the base end of the fixing tool main body 10, and the pivot foot 12 for attaching to the concrete formwork M is integrally protruded from the base end of the fixture main body 10. , a deep and wide top-opening groove 15 is provided to receive the large-diameter head 17 at the end of the separator;
In this separator fixing tool, a separator fixing tool is provided with a shallow and narrow recess 18 with an opening at the top, which should receive the recess 18 itself. is arranged at the tip of the main body 10 in a substantially V-shape when viewed from the front symmetrical with respect to the vertical center line Y-Y of the notch 18, and both elastic wedge claws 21 are forcibly expanded and deformed. The separator 16, which is correctly received and guided into the recess 18 by the wedge claw 21, is automatically restrained so that it cannot be removed from the recess 18 by the restoring deformation of the wedge claw 21. It has the effect of improving all technical problems.

In other words, in the case of the present invention, the recess 1 for receiving the separator 16 itself is provided at the tip of the main body 10.
8 has a shallow and narrow upper opening type, the pair of left and right elastic wedges 21 that protrude and are oriented to close the upper part of the opening of the recess 18 are aligned with the vertical center line of the recess 18. It is arranged in a substantially V-shape when viewed from the front symmetrical with respect to Y-Y, and both wedge claws 21 have not only the material characteristics of the main body 10 itself but also the shape characteristics that project into the V-shape. Since the separator 16 is designed to expand and deform in a manner that allows recovery, a common straight shaft type simple product is used as the separator 16, and this is inserted into the concave notch 18 of the main body 10.
It is extremely easy to push the inside of the
Nevertheless, once pushed in, the separator 16 can be restrained and fixed in such a way that it will never float up and come off.

When the separator 16 is pushed in, both elastic wedge claws 21 are forcibly expanded and deformed, and the resulting V-shaped wedge space S is formed by the vertical center line Y-Y of the recess 18.
Since it is located above, the separator 16 can be correctly received into the recess 18 by itself due to the guiding action of the two wedge claws 21, and after the separator 16 is received, the two wedge claws 21 have a restoring action. Notch 18
As a result, the upper part of the opening of the main body 10 is blocked so that the concrete poured into the notch 18 and the groove 15 is accumulated, and the notch 18 is opened sideways or downward. is formwork M
Even if the separator 16 were to be attached to the recess 18, the separator 16 would never float away from the recess 18 and would be held in its stable state.

Therefore, there is no need to be concerned about the fitting dimension relationship between the separator shaft portion 21a and both of its holding pieces 4, 4, as in the prior invention mentioned at the beginning, and the formwork 12
There is no need to process the rotation stopper pieces 10, 10 of the fixture 1 to the connecting shaft 8 of the fixture 1. Furthermore, in order to prevent the separator 21 from coming off, there is no need to perform special operations such as piercing a nail or rotating a rotary plate.

In the case of the present invention, the main body 10 can be manufactured very simply by simply molding it from synthetic resin, and the separator 16 can be easily manufactured by simply pushing it into the recess 18 of the main body 10 as described above. Moreover, since the separator 16 can be fixedly restrained so that it will never come off later, it is extremely useful as a separator fixing tool that is used in large quantities.

In particular, when the recess 18 is disposed at the tip of the main body 10, the separator 16 received by the recess 18 and the pivot foot 12 for attachment to the formwork M are located on the same axis P-P. If the depth and opening width of the recess 18 are set, even if the main body 10 receives the tensile load of the separator 16, it will not deform into an incorrect posture such as bending from the weir plate 11 of the formwork M. It can be said that it is even more beneficial in that it can exhibit excellent tensile strength.

[Brief explanation of the drawing]

Figures 1 to 3 relate to conventional products; Figure 1 is a sectional view showing the tightened state of the beam formwork; Figure 2 is an enlarged cross-sectional view of part A in Figure 1; and Figure 3 shows the formwork. A sectional view corresponding to FIG. 2 in a disassembled state, FIG. 4 is a slope view of the fixing device according to the present invention seen from the front, FIG. 5 is a slope view similarly seen from the rear, and FIG. 6 is a front view. Fig. 7 is a plan view, Fig. 8 is a sectional view taken along the line B-B in Fig. 7, Fig. 9 is a partially cutaway sectional view showing the formwork tightened by using fixing tools, and Fig. 10 is a sectional view taken along line B-B in Fig. 7. FIG. 11 is a sectional view taken along line C-C in FIG. 9, FIG. 12 is a front view showing the deformation action of the elastic wedge, and FIG. 13 is a cross-sectional view showing the disassembled state of the formwork. A slope view showing a modified example, FIG. 14 is a plan view thereof, and FIG.
The figure is also a side sectional view of the device in use. 10... Fixed tool main body, 12... Pivot foot, 15...
... Concave groove, 16 ... Separator, 17 ... Large diameter head (nut), 18 ... Concave notch, 20 ... Fulcrum ear piece, 21 ... Elastic wedge, 22 ... Relief notch, M ...
...Formwork, S...wedge space.

Claims (1)

[Claims for Utility Model Registration] 1. A shaft foot 12 for attachment to the concrete formwork M is integrally projected from the base end of the fixture body 10, and a separator end portion is provided at approximately the middle of the body 10. A deep and wide concave groove 15 with an upper opening is provided to receive the large diameter head 17 of the separator 1.
In this separator fixing tool, a pair of left and right elastic wedges 21 are provided with a shallow and narrow recess 18 with an opening at the top to receive the recess 18. , is arranged at the tip of the main body 10 in a substantially V-shape when viewed from the front, symmetrical with respect to the vertical center line Y-Y of the notch 18, and by forcibly expanding deformation of both elastic wedge claws 21. Separator fixing for concrete formwork, characterized in that the separator 16, which is correctly received and guided into the recess 18, is restrained so that it cannot be automatically removed from the recess 18 by restoring deformation of its wedge claws 21. Tools. 2 Recess 18 for receiving the separator 16 itself
, separator 16 accepted into this
and the pivot foot 12 for attachment to the formwork M are located on the same axis line P-P, which is formed at the tip of the fixing tool main body 10. Separator fixing tool for concrete formwork as described in item 1.