JPS639735Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a separator fixing tool for concrete formwork, and in particular to an improvement for its finishing.

For example, in beam form work for concrete buildings, when tightening the formwork, two upper and lower separators are fixed horizontally between the weir plates of the formwork. 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 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 into the mold M. In the fixed state, this protrudes long inward from the weir plate 4 and tends to become an obstacle 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 has been devised to solve these problems and also to obtain optimal elasticity when installing the separator and excellent fixing strength after installation. ~12
To explain in detail based on the embodiment shown in the figure, 10 is a fixture main body integrally injection molded from a high-strength synthetic resin, particularly a polyamide type resin such as 66-nylon or 6-nylon containing glass fiber; As a whole, the cross section is approximately semicircular with a horizontally flat top surface. Of course, this may be colored, and its overall length L is preferably set as short as possible so that it does not protrude excessively inward from the weir plate 11 of the formwork M. .

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 breakage guide groove carved at the base of the shaft foot 12 protruding from its base end, so that after the formwork M is dismantled, it can be accurately aligned from the position of the groove 14. Moreover, the broken shaft leg 12 can be easily removed, and subsequent finishing work can be performed with high efficiency. 15 is the main body 10
It is a concave groove opened in the middle of the hole, and has a deep and wide opening at the top. 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 plate nut screwed into the threaded portions at both ends of the separator 16 is shown as the large-diameter head 17, but in addition to the nut, a washer may also be inserted into the separator 16. Instead of a nut, large-diameter heads may be formed integrally extending from 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 inner bottom surface of this recessed notch 18, which is set in a relationship such that the protruding shaft foot 12 is located on the same axis P, forms a concave curved surface that almost matches the circumferential surface of the separator 16, and also has a depth. Since the depth of the groove 15 is shallower than that of the groove 15, a certain level difference 19 is created at the boundary between the middle part and the tip of the main body 10, which causes the separator 16 to The large diameter head 17 is locked to the tip and does not come off in the axial direction.

Reference numeral 20 designates a pair of right and left 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. Reference numeral 21 denotes a pair of left and right elastic tongues which extend obliquely downwardly from the ear piece 20 and are extended so that the lower tips of the tongues approach each other so as to always close the upper part of the opening of the recessed notch 18. The separator 16 is prevented from floating up after being received in the recess 18. A wedge space S that is approximately V-shaped when viewed from the front or the front is defined between the opposing tongue pieces 21, and when the separator 16 is artificially pushed into this space S from above, , while the tongue piece 21 is forcibly expanded and deformed, the separator 1
6 into the concave notch 18 located directly below it in a falling manner, and then restored and deformed to form the separator 1.
6 is restrained. That is, the tongue piece 21 can be elastically deformed using the ear piece 20 serving as its protruding base as a fulcrum, and in order to smooth the expansion action, the tip of the main body 10 is continuous with the recessed notch 18. A pair of left and right tongue 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 tongue pieces 21 in its natural state, but the depth of the wedge space S is particularly small. In the case of this invention, W is
By extending the tongue piece 21 long from the fulcrum ear piece 20 as described above, the depth is determined to be greater than the diameter dimension d of the separator 16. 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 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 addition, in order to continue pushing the separator 16 smoothly, the tongue piece 21 is set at a certain height H above the flat top surface of the intermediate portion of the main body 10.
A pair of fulcrum ears 20 protruding from the distal end of the tongue are continuously extended and extended obliquely downward, and the tongue relief notch 2
2 is also formed at the tip.

In tightening the concrete form M using the present invention configured as described above, steps 9 to 1 are performed.
As shown in Figure 1, the pivot foot 12 protruding from the base end of the fixing tool body 10 is penetrated through the weir plate 11 of the formwork M, and the form tie 23 is fastened to the threaded portion of the pivot foot 12 from the outside of the weir plate 11. By doing this, the main body 10 is first 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 nuts such as nuts are attached to both ends. A straight shaft type separator 16 provided with a head 17 is fixedly suspended horizontally between the two main bodies 10.

That is, the separator 16 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 16 is struck and forced downward as shown by the solid line in the figure. Then, the tongue piece 21 holding the separator 16 itself becomes the first
The separator 16 is expanded and deformed as shown in Figure 2.
The large-diameter head 17 fell instantly into the recess 18 of the main body 10 and was accepted into the recess 15 of the main body 10, and the raised separator 16 was restored and deformed. Tongue piece 21
Movement along the axial direction is completely prevented by the locking of the large diameter head 17 with the distal end. After the concrete poured in the formwork M has hardened, the weir plate 11 is removed as shown in Fig. 10, the shaft foot 12 protruding from the concrete surface is hammered and broken off from its base, and finishing work is carried out. That's what I do. In other words, the fixture of the present invention is for finishing purposes.

As described above, in the present invention, the separator 16 is preferably made of high-strength synthetic resin such as 66-nylon or 6-nylon with glass fiber as a device for fixing and horizontally suspending the separator 16 on the formwork M, and the fixing tool body is A deep and wide top-opening groove 15 for receiving the large-diameter head 17 at the end of the separator is provided approximately in the middle of the main body 10 in the longitudinal direction; In addition, the overhanging flange 13 of the shaft foot 12, which will be broken after the formwork M is dismantled, is buried and integrated, and the main body 10 is
A shallow and narrow upper opening type recess 18 for receiving the separator 16 itself is provided at the tip, and the separator 16 is inserted into the recess 18 with the upper part of the opening of the recess 18 being oriented so as to be always closed. A pair of left and right elastic tongues 2 to prevent lifting after receiving
1, and a pair of left and right tongue relief notches 22 that are continuous with the recessed notch 18 and face each other in a substantially L-shape, and between the elastically deformable tongue pieces 21,
Since the almost V-shaped wedge space S is defined, it is possible to use a common straight shaft type simple product as the separator 16, completely solving the problems of the conventional structure mentioned at the beginning. The workability on site and the mass production of the main body 10 are also excellent.

Moreover, especially in the case of the present invention, the wedge space S is erected by a certain height H above the top surface of the intermediate portion 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 16 itself. In addition to the above-mentioned effect, the tongue piece 21 is continuously extended diagonally downward from the pair of left and right fulcrum ears 20 protruding from the tip of the separator 16. Tongue piece 2
1, suitable elasticity and excellent fixing strength in the attached state can also be obtained.

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 1a is a fixture main body 10 with 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 18a. For this purpose, the diameter d of the separator 16a is set constant, and a recess 18a of approximately the same size is formed in the main body 10.
If it is assumed that the projecting length of the tongue piece 21a is shortened, the V-shaped space S defined by the tongue piece 21a is opened.
There is a constraint that the depth W of the V-shape must be made shallow, and that the V-shaped intersection angle θ must be formed at a large acute angle close to a right angle.

According to this, the tongue piece 21a is elastically deformed.
The elasticity of the separator is poor, and since the separator is temporarily fixed in the wedge space S, it lacks a stable state, and the subsequent pushing operation cannot be carried out easily. In order to increase its elasticity, it is necessary to make the tongue piece 21a itself thinner; however, the thinner the tongue piece 21a itself is, the more the fixing strength of the attached state deteriorates, and the pressure with which the separator 16a receives the tensile load decreases. As a result, the tongue piece 21a or the tip of the body to which it is attached will be improperly bent or completely sheared as it expands as shown by the chain line in FIG. This is even more the case when the relief notch 22a of the tongue piece 21a 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. 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 18
Even if the main body 10 is located on the central axis P of the main body 10, the main body 10 is located at the tip of the main body 10.
A pair of fulcrum ears 20 are protruded from the flat top surface by a certain height H, and an elastically deformable tongue 21 using these positions as fulcrums extends the recessed notch 18 from the ears 20. This is because the wedge space S defined by the wedge space S is set so as to be larger than the diameter dimension d of the separator 16. , it is not necessary to make the tongue piece 21 itself thinner, and it is possible to improve the fixing strength and provide optimum elasticity.This allows the work of tapping and pushing to be performed smoothly and easily, and the The temporarily fixed state of the separator 16 prior to operation can also be stabilized by holding the separator 16 so that it is completely buried in the wedge space S as shown by the chain line in FIG. The smoothness of such action can be further improved by providing the relief notch 22 of the tongue piece 21 and by setting the V-shaped intersection angle θ to an acute angle, preferably 45 degrees or less. It can be said that this is a highly profitable 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... 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 tongue piece, 22 ... Tongue piece relief notch,
M...Formwork, S...Wedge space.

Claims (1)

[Claims for Utility Model Registration] 1. A fixing tool body 10 made of high-strength synthetic resin such as 66-nylon or 6-nylon with glass fiber, as a device for horizontally fixing the separator 16 to the formwork M. A deep and wide top-opening groove 15 is provided at approximately the middle in the longitudinal direction of the main body 10 for receiving the large-diameter head 17 at the end of the separator, and a groove 15 with an open top that is deep and wide is provided at the base end of the main body 10 for attachment to the formwork M. , and the overhanging flange 13 of the shaft foot 12, which will be broken after the formwork is dismantled, is buried and integrated, and a shallow and narrow recess with an upper opening for receiving the separator 16 itself is provided at the tip of the main body 10. 18, and the upper part of the opening of the recess 18 is oriented to project so as to be closed at all times,
A pair of left and right elastic tongues 21 that prevent the separator 16 from floating up after being received into the recess 18
and a pair of left and right tongue relief notches 22 which are continuous with the recessed notch 18 and face each other in a substantially L-shape, and the depth of the approximately V-shaped wedge space S defined between the two tongues 21. W is separator 1
6 so that it is larger than its own diameter dimension d,
A pair of left and right fulcrum ears 20 that stand up from the top surface of the main body 10 by a certain height H are protruded from a pair of left and right fulcrum ears 20, and the tongues 21 are continuously and integrally extended obliquely downward. Features: Concrete formwork separator fixing tool. 2. A separator fixing tool for concrete formwork according to claim 1 of the Utility Model Registration Claim, characterized in that the V-shaped intersection angle θ of the wedge space S is set to an acute angle of 45 degrees or less. 3. The utility model registered as claimed in item 1, characterized in that a concave line 14 for a breakage guide is carved in advance at the base of the pivot foot 12 protruding from the base end of the main body 10. Separator fixing tool for concrete formwork.