JPS639734Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a separator fixing tool for concrete formwork, and more particularly, to an improvement in its use for demolishing.

For example, in beam formwork work for concrete buildings, when tightening the formwork, two separators are fixed horizontally between the weir plates of the formwork, but the separator at the upper position is After the fixed horizontal suspension is installed, this becomes an obstacle and prevents the reinforcing bars from being placed inside the formwork. Conventionally, the separator and the fixing tools at both ends of the separator are made separately in advance, and then the first A structure in which the parts are combined as shown in Figure 3 is adopted.

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. Second, separator 6
In order to prevent the screw from lifting up or coming off, it is necessary to screw the nut 7 onto both ends of the screw, which is extremely complicated work. Thirdly, since the ring hardware 3 is screwed into the cone 2 as if adding it, it is necessary to manufacture and prepare both parts separately. In the fixed state, this protrudes inward from the weir plate 4 for a long time, which tends to become a problem in the arrangement of reinforcing bars. Fourthly, after dismantling the formwork M, the cone 2 is removed from the hardened concrete.
It is necessary to remove it, and furthermore, the space remaining after the removal must be backfilled with mortar 8, etc., as shown in FIG. In any case, it is clear that they are inferior in terms of on-site workability and manufacturing costs.

The present invention is intended to improve these problems and also to obtain optimal elasticity when installing the separator and fixing strength after installation.The specific configuration is shown in Figures 4 to 12. To explain in detail based on an example, 10 is a fixture main body that is integrally injection molded from a hard synthetic resin, particularly 66-nylon, 6-nylon containing glass fiber, or other polyamide type resin. This may be colored, and the proximal end 11, which is the side to be attached to the formwork M, has a circular cross section, and the distal end 12 and the approximately intermediate portion 13 have a generally semicircular cross section. There is. L ₁ , L ₂ , L ₃ are each part 1
1, 12, and 13, the total length of the main body 10 should be as short as possible so as not to protrude too much inward from the weir plate 14 of the formwork M. It is preferable to specify.

Reference numeral 15 denotes a nut with a flange 16, which is embedded and integrated between the base end 11 and the intermediate part 13 so that the screw hole opens at the circular center of the base end 11, and which is larger than the screw hole. A through hole 17 having a size smaller than the diameter of the collar 16 is opened in the base end 11 of the resin main body 10. And this hole 1
7 into the screw hole of the nut 15, a mounting shaft or a cap, which will be described later, can be inserted.
The vertically flat outer surface of the base end 11 has a rough surface that is the same as or similar to the concrete surface, since the main body 10 is intended for use as a concrete surface. I've learned not to give anything. For the same purpose, the protruding flange of the cap, which will be described later, also has a roughened surface.

The top surface of the intermediate portion 13 of the main body 10 is a horizontal flat surface, and a deep and wide recessed groove 18 with an opening at the top is provided here. This groove 18 functions to receive the large diameter head 20 of the separator 19 in a buried state. In the case of the illustrated example,
As the large diameter head 20, a large diameter nut screwed into the threaded portions at both ends of the separator 19 is shown, but in addition to the nut, a washer may also be inserted into the separator 19, or a large diameter nut may be used instead of the nut. It is also possible to form the heads integrally overhanging both ends of the separator 19. Furthermore, although the inner bottom surface of the groove 18 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 20 can be accommodated therein.

Reference numeral 21 denotes a shallow and narrow top-opening recess formed in the distal end 12 of the main body 10 for receiving the separator 19 itself; 11 and a nut 15 embedded therein are positioned on the same axis P. This depression 2
The inner bottom surface of the main body 10 has a concave curved surface that almost matches the circumferential surface of the separator 19, and the depth thereof is shallower than that of the groove 18. A certain level difference 22 is created at the boundary between the separator 19 and the tip 12, so that the large-diameter head 20 of the separator 19 locks onto the tip 12 and is prevented from coming out in the axial direction. do not have.

Reference numeral 23 designates a pair of left and right fulcrum ears provided on the tip 12 of the main body 10, which stand up a certain height H higher than the top surface of the intermediate portion 13.
24 is a pair of left and right elastic tongues extending obliquely downward from the ears 23, and
The lower tip approaches the upper part of the opening of the recess 21 so as to always close it, thereby preventing the separator 19 from floating up after being received in the recess 21. Between the opposing tongue pieces 24,
Wedge space S that is almost V-shaped when viewed from the front or front
is defined, and when the separator 19 is artificially pushed into this space S from above,
While the tongue piece 24 is forcibly expanded and deformed, the separator 19 is correctly dropped into the recess 21 located directly below the tongue piece 24, and then restored and deformed to restrain the separator 19. In other words, the tongue piece 24 can be elastically deformed using the ear piece 23 serving as its protruding base as a fulcrum, and in order to smooth the expansion action, the tip part 12 of the main body 10 is continuous with the recessed notch 21. A pair of left and right tongue relief notches 25 facing each other in a substantially L-shape are also stepped.

As mentioned above, the upper opening width of the recess 21 is substantially equal to the diameter d of the separator 19, and the upper opening width in the V-shaped wedge space S is larger than the diameter d, and the lower opening width is also larger than the diameter d. Of course, the separator 19 once inserted into the wedge space S is held by both tongue pieces 24 in its natural state, but the depth of the wedge space S is smaller. In the case of this invention, W is
By extending the tongue piece 24 long from the fulcrum ear piece 23 as described above, the depth is determined to be greater than the diameter dimension d of the separator 19. Furthermore,
The V-shaped intersection angle θ of the wedge space S is also preferably set to an acute angle of 45 degrees or less as shown in the figure.
That is, the elastic tongue piece 24 can be optimally elastically deformed without being thinned due to its strength, and the separator 19 can be held stably once in a so-called completely embedded state in the wedge space S defined thereby.
In addition, a pair of fulcrum ears are provided on the tip portion 12 so that the separator 19 can be pushed in smoothly, the tongue pieces 24 of which are erected by a certain height H above the top surface of the intermediate portion 13 of the main body 10. It extends continuously diagonally downward from the piece 23, and the tongue release notch 25 is also formed in the tip 12.

In tightening the concrete form M using the present invention configured as described above, steps 9 to 1 are performed.
As shown in the figure, the nut 1 built into the fixture body 10
5, screw the threaded portion of one end of the pivot foot 26 into the pivot foot 2.
6 through the weir plate 14 of the formwork M, and by fastening the form tie 27 to the threaded portion of the other end of the pivot foot 26 from the outside of the weir plate 14, the main body 10 is first
are installed and fixed inside the weir plate 14 in a symmetrical arrangement, and after arranging reinforcing bars (not shown) in the formwork M, large diameter heads 2 such as nuts are attached to both ends.
Straight shaft type separator 19 with 0
is fixedly suspended horizontally between the two main bodies 10.

That is, the separator 19 is inserted into the V-shaped wedge space S of the main body 10 from above as indicated by the arrow in FIG. The separator 19 is struck and forced downward as shown by the solid line in the figure. Then, the tongue piece 24 holding the separator 19 itself will be the first
The separator 19 is expanded and deformed as shown in Figure 2.
The separator 19 fell instantly into the recess 21 of the main body 10, and the large diameter head 20 fell into the recess 18 of the main body 10, and the raised separator 19 was restored and deformed. Tongue piece 24
Movement along the axial direction is completely prevented by the locking of the large diameter head 20 with the distal end portion 12, respectively. After the concrete cast in the formwork M hardens, the weir plate 14 and the pivot foot 26 are removed, and the nut 15 is inserted into the screw hole of the opened main body 10 as shown in FIG.
The cap 28 is press-fitted through the through hole 17.

In other words, the fixing tool of the present invention is for shooting,
The cap 28 is also prepared to be molded from the same hard synthetic resin as the main body 10. 29 is the cap 2
Reference numeral 8 indicates an overhanging collar, and reference numeral 30 indicates a plurality of protrusions provided on the hollow cylindrical portion.

As described above, in the present invention, the separator 19 is preferably made of a hard synthetic resin such as 66-nylon or 6-nylon with glass fiber as a device for fixing and horizontally suspending the separator 19 on the formwork M. At approximately the middle portion 13 in the longitudinal direction,
A deep and wide top-opening groove 18 is provided to receive the large-diameter head 20 at the end of the separator, and a shaft foot 26 for attachment to the formwork M is screwed into the base end 11 of the main body 10. The nut 15 is embedded and integrated, and the tip 12 of the main body 10 has a shallow and narrow recess 21 with an upper opening for receiving the separator 19 itself, and the recess 21 is oriented to protrude so as to always close the upper opening of the recess 21. and a pair of left and right elastic tongues 24 that prevent the separator 19 from floating up after being received into the recess 21, and the recess 2.
1, a pair of left and right tongue relief notches 25 facing each other in a substantially L-shape are provided, and an approximately V-shaped wedge space S is defined between the elastically deformable tongues 24. , it is possible to use a common straight-shaft type simple product as the separator 19, completely solving the problems of the conventional structure mentioned at the beginning, and improving on-site workability and improving the main body 1.
It is also extremely suitable for mass production.

Moreover, especially in the case of the present invention, the wedge space S is raised by a certain height H from the top surface of the intermediate portion 13 of the main body 10 so that the depth W of the wedge space S is greater than the diameter dimension d of the separator 19 itself. In addition to the above-mentioned effect, the separator 19 can be attached easily due to the structure in which the tongue piece 23 is extended diagonally downward continuously from the pair of right and left fulcrum ears 23 protruding from the tip part 12. This also provides suitable elasticity of the upper tongue piece 24 and excellent fixing strength in its attached state.

That is, the above effects will be explained by referring to the comparative example shown in FIGS. 13 to 15, which were tested in the process of completing the present invention.
The left and right pair of 4a is a fixing tool main body 10 having a circular cross section.
It extends inward and obliquely downward from a part of the circumferential surface of a to face the upper opening of the separator receiving recess 21a. For this purpose, the diameter dimension d of the separator 19a is set constant, and a recess 21a of approximately the same size is formed in the main body 10a.
If it is assumed that the opening is located on the circular center axis P, the depth W of the V-shaped wedge space S defined by this must be made shallow, and the V-shaped intersection angle There is also a constraint that θ must be formed at a large acute angle close to a right angle.

According to this, the tongue piece 24a is elastically deformed.
It has poor elasticity, and since the separator is temporarily fixed in the wedge space S, it lacks a stable state, and the subsequent pushing operation cannot be performed easily. In order to increase its elasticity, it is necessary to make the tongue piece 24a itself thinner; however, the thinner the tongue piece 24a itself is, the more the fixing strength of the attached state deteriorates, and the pressure with which the separator 19a receives the tensile load decreases. As a result, the tongue piece 24a and the tip end portion 12a of the main body to which the tongue piece 24a is attached will be improperly bent or sheared, as shown by the chain line in FIG. This is even more the case when the relief notch 25a of the tongue piece 24a is not formed. Such problems cannot be solved even if the main body 10a itself is enlarged and the crossing angle θ is set to a small acute angle, and on the contrary, the wedge space S is shallow. The condition becomes increasingly unstable, and it becomes easy to fall off during the pushing operation.

In this regard, according to the configuration of the present invention, the recess 21
is arranged on the central axis P of the circular proximal end 11 of the main body 10, the distal end 12 of the main body 10 also has a pair of parts that stand up by a certain height H above the top surface of the intermediate part 13. A fulcrum lug 23 is provided in a protruding manner, and a tongue piece 24 that can be elastically deformed using the position as a fulcrum extends continuously overhang from the lug 23 to a diagonally downward direction toward the notch 21. Since the depth W of the wedge space S defined by this is determined to be greater than the diameter dimension d of the separator 19, the tongue piece 24
It is not necessary to make the separator 19 thinner, and while improving the fixing strength, it can provide optimal elasticity.This allows the work of hammering and pushing to be performed smoothly and easily, and the separator 19 is
Even in the temporarily fixed state, the separator 19 is placed in the wedge space S.
It can be stabilized by holding it in such a way that it is completely buried inside, as shown by the chain line in FIG. The smoothness of such action can be further improved by providing the relief notch 25 in the tongue piece 24 and by setting the V-shaped intersection angle θ to an acute angle, preferably 45 degrees or less. , can be said to be a very useful idea that can be used not only for the beam formwork mentioned above but also for foundation formwork.

[Brief explanation of the drawing]

Figures 1 to 3 relate to the conventional structure, with Figure 1 being a sectional view showing the tightened state of the beam formwork, Figure 2 being an enlarged cross-sectional view of part A in Figure 1, and Figure 3 showing 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. 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 tongue, and FIG. 13 is a comparison of fixing tools. FIG. 14 is a front view showing an example, and FIG. 15 is a sectional view taken along the line DD in FIG. 14. 10...Fixing tool main body, 11...Proximal end portion, 12
... Tip part, 13 ... Middle part, 15 ... Nut,
18... Concave groove, 19... Separator, 20...
Large diameter head (nut), 21... concave notch, 23... fulcrum ear piece, 24... elastic tongue piece, 25... tongue piece release notch, 26 pivot foot, M... formwork, S... wedge space.

Claims (1)

[Claims for Utility Model Registration] 1. The separator 19 is made of a hard synthetic resin as a device for fixing and horizontally hanging the separator 19 on the formwork M,
A deep and wide top-opening groove 18 for receiving the large-diameter head 20 at the end of the separator is provided at approximately the middle portion 13 in the longitudinal direction of the fixing device main body 10.
A receiving screw nut 15 for the pivot foot 26 for attachment to the formwork M is embedded and integrated in the main body 1.
The separator 19 has a shallow and narrow upper opening type recess 21 at the tip 12 of the separator 19 for receiving the separator 19 itself, and the separator 19 is oriented such that the upper opening of the recess 21 is always closed.
a pair of left and right elastic tongues 24 that prevent the tongue from floating up after being received into the recess 21, and the recess 21
A pair of left and right tongue relief notches 25 facing each other in a substantially L-shape are provided continuously with the tongues 24, and the depth W of the approximately V-shaped wedge space S defined by the two tongues 24 is equal to that of the separator 19 itself. The tongue piece 24 is larger than the diameter dimension d.
from a pair of left and right fulcrum ears 23 that protrude from the tip 12 and stand up by a certain height H from the top surface of the intermediate portion 13 of the main body 10,
A separator fixing tool for concrete formwork that is characterized by being continuously extended diagonally downward. 2. A separator fixing tool for concrete formwork according to claim 1, wherein the V-shaped intersection angle θ of the wedge space S is set to an acute angle of 45 degrees or less. 3 Claims for Utility Model Registration/A separator for concrete formwork according to item 1, which is characterized by being injection molded using a polyamide type resin such as 66-nylon or 6-nylon with glass fiber as the synthetic resin. Fixtures.