JP2012172407A - Auxiliary member for preventing excessive fastening of formwork - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a collar part of the tip in a form tie from cutting into a formwork due to excessive fastening when the formwork is fastened by the form tie.SOLUTION: A shank 39 on a forward side of a form tie 6 is fitted to a semicircular concave groove 40 installed at the central part while a collar part 11 of the tip in the form tie 6 is mounted on a fitting recess 44 at the tip of the semicircular concave groove 40, so that the collar part 11 can be flush with the tip edge part of an auxiliary member 31 for preventing excessive fastening of a formwork and the area of a contact part 46 in contact with a formwork 3 can be large.

Description

The present invention relates to an overtightening prevention auxiliary member for a formwork that prevents a brim at the tip of the foam tie from biting into the formwork when tightening a formwork made of plywood with a formtie (trade name). Is.

At the concrete placement site, it is common to use a foam tie when assembling the formwork, but in recent years due to the power-up of power tools, the form tie has been tightened too much, and the tip of the form tie is attached to the formwork. There was a problem that the brim portion of the form tie bites in, and it is difficult to dispose of the formwork, and the bite mark of the brim portion of the foam tie remains as a dent on the cast concrete surface.

The prior art for preventing bite into the formwork due to excessive tightening of the form tie was searched retrospectively for patent documents, but one prior art could not be found. And as a prior art for simply preventing deformation of the mold, a deformation preventing tool in which a part of the flat plate of the mold is prevented from changing in the inner surface direction by a stopper provided on the foam tie is disclosed in the following patent document. It is known. However, in the invention described in the patent document, there is a problem that it is not possible to prevent the leading end portion of the foam tie from biting into the mold.

Japanese Patent Laid-Open No. 11-93412

The problem to be solved by the present invention is to prevent the brim of the foam tie from being excessively tightened and the brim at the tip of the foam tie from biting into the mold.

According to the present invention, a mold clamp is installed between two support members disposed at intervals on the outer surface of two arithmetic trees provided at intervals on the outer surface of the mold. An auxiliary member for preventing excessive tie, and a tip of the foam tie is formed in a semicircular concave groove provided at the center of the auxiliary member for preventing excessive tightening of the mold formed of a hard synthetic resin having the same height as the arithmetic tree. And insert the flange portion of the foam tie into the fitting recess at the distal end of the semicircular concave groove, and insert the flange portion into the leading edge of the auxiliary member for preventing excessive tightening of the formwork. The above-mentioned problem has been solved by adopting a means for making the area of the contact portion in contact with the formwork large with the portion being flush with each other.

The auxiliary member for preventing over-tightening of the mold according to the present invention includes a shaft portion on the front side of the foam tie fitted in a semicircular concave groove provided in the center portion, and the collar portion at the tip of the foam tie is inserted into the semicircle. Since the fitting portion is attached to the fitting recess at the tip of the concave groove, the collar portion is flush with the tip edge portion of the auxiliary member for preventing excessive tightening of the formwork, and the area of the contact portion that comes into contact with the formwork is increased. Even if the foam tie is tightened strongly, not the point contact where only the collar part is crimped to the mold as in the prior art, but the surface area of the contact part is expanded and the pressure applied to the collar part is dispersed. Overtightening to the formwork is prevented.

It is the whole perspective view which looked at the present invention form-tightening prevention auxiliary member from the front side, with the contact portion on one side positioned on the upper surface. It is the whole perspective view which looked at the auxiliary member for prevention of excessive tightening of the present invention from the back side with the contact portion on the other side positioned on the upper surface. It is a center cross-sectional view in FIG. FIG. 5 is a view showing a use state where a contact portion on one side of the auxiliary member for preventing over-tightening of the present invention is in contact with the mold, and a vertical cross-sectional view showing the right side with a part cut away from the center, left side Is a cross-sectional view rotated 90 degrees. It is a perspective view of the principal part which shows the use condition which contact | abutted the contact part of the one side in this invention form-mold excessive tightening prevention auxiliary member to the formwork. FIG. 4 is a diagram showing a use state in which the other side contact portion of the auxiliary member for preventing over-tightening of the mold according to the present invention is in contact with the mold, and is a longitudinal cross-sectional view showing the right side with a part cut away from the central portion; Is a cross-sectional view rotated 90 degrees. It is a perspective view of the principal part which shows the use condition which contact | abutted the contact part of the other side in this invention form-mold excessive tightening prevention auxiliary member to the formwork. FIG. 6 is a diagram showing another example of use of the auxiliary member for preventing over-tightening of the formwork of the present invention, wherein the right side is a side view with the central part as a boundary, and the left side is rotated 90 degrees and is partially cut away. It is. It is a perspective view of the principal part. FIG. 4 is a cross-sectional view of a conventional mold clamping device, in which a right side is a vertical cross-sectional view and a left side is a cross-sectional view rotated 90 degrees with a central portion as a boundary.

Between the support members composed of two single pipe pipes arranged at intervals on the outer surface of two arithmetic trees provided at intervals on the outer surface of the formwork, An over-tightening prevention auxiliary member made of hard synthetic resin with the same height as the height is installed, and the shaft portion on the front side of the foam tie is inserted into the semicircular concave groove of the over-tightening prevention auxiliary member of the formwork At the same time, the flange portion at the tip of the foam tie is attached to the fitting recess at the tip of the semicircular concave groove so that the flange portion and the tip edge portion of the auxiliary member for preventing excessive tightening of the mold are flush with each other. The area of the contact portion in contact with the mold is increased, and the pressure applied to the collar portion is dispersed to prevent overtightening of the foam tie.

As shown in FIG. 10 (FIG. 10 shows a vertical cross-sectional view on the right side and a cross-sectional view rotated 90 degrees on the left side with the central part as a boundary), the conventional concrete mold clamping apparatus has cones at both ends. The separator 2 to which 1 is attached is disposed between the molds 3, and the bolts 5 projecting integrally with the cone 1 from the holes 4 formed in the molds 3 are projected to the outside of the molds 3, The bolt 5 is screwed and connected to a screw hole (not shown) provided at the front portion of the foam tie 6, and two support members made of a single pipe pipe are connected to the arithmetic tree 7 outside the mold 3. In a state in which 8 is aligned with a gap, a mold washer 9 inserted into the foam tie 6 is tightened with a nut 10 to press the mold 3 from both sides via the support member 8, and the foam tie The flange portion 11 formed in a large diameter at the tip end portion of the 6 is pressed against the outer surface of the mold 3, By preventing biting into the mold 3 in the form tie 6, mold 3 is formed so as to be fixed by keeping a predetermined interval.

However, in the conventional concrete mold clamping apparatus, when the nut 10 of the foam tie 6 is tightened using a clamping device such as an electric tool, the collar portion 11 has a small diameter and the contact portion to the mold frame 3 is the collar. Since only the portion 11 is in contact, the contact area with the mold 3 is small, and the rotation of the foam tie 6 causes the collar 11 to bite into the mold 3 and damage the mold 3 as a result. There is a risk that it will remain as a dent on the concrete surface after placement.

In the present invention, in order to prevent the flange portion 11 of the foam tie 6 from biting into the mold 3, the overtightening prevention auxiliary member 31 of the present invention is used at the time of mold clamping. Hereinafter, the present invention will be described in detail with reference to the drawings. However, the same reference numerals as those described in the conventional mold clamping apparatus will be used as they are.

Since the auxiliary member 31 of the present invention needs to have strength, it is formed in a rectangular parallelepiped shape with a hard synthetic resin. FIG. 1 is an overall perspective view of the auxiliary member 31 as viewed from the front side with the contact portion on one side positioned on the top surface, and FIG. 2 is viewed from the back side with the contact portion on the other side positioned on the top surface. The auxiliary member 31 is formed by joining and fixing front and rear side plates 32 and 33 having a horizontally long rectangular shape and both side plates 34 and 35 having a narrower width than the front and rear side plates 32 and 33 in a cylindrical shape. In the central longitudinal direction of the rectangular parallelepiped cylindrical body 36, the reinforcing partition plate 37 is integrally connected and fixed in contact with the side plates 34, 35, and on the front side and the back side of the reinforcing partition plate 37, A plurality of reinforcing plates 38 are in contact with the front and rear plates 32 and 33 and are integrally connected and fixed, with appropriate intervals at right angles, leaving the central portion.

Further, an insertion plate 41 having a semicircular groove 40 into which the shaft portion 39 of the foam tie 6 is fitted and inserted in the central lateral direction of the front side plate 32 has an opening 40 a of the semicircular groove 40. The insertion plate 41 is recessed so as to be positioned on the front side plate 32, and the bottom of the insertion plate 41 (the side opposite to the opening 40a) is fixed to the rear side plate 33. Further, both end portions of the insertion plate 41 are formed. Are provided with fitting recesses 42 and 43 having a diameter larger than that of the insertion plate 41 so that the flange portion 11 at the tip of the foam tie 6 is fitted and flush with the tip surface of the flange portion 11. Semicircular fitting walls 44 and 45 are disposed on the outer peripheral surface of the insertion plate 41 with a gap.

The shapes of the contact portions 46 and 47 of the auxiliary member 31 to the mold 3 are different. That is, as shown in FIG. 1, the contact portion 46 on one side of the auxiliary member 31 has the side plates 34 and 35, the reinforcing partition plate 37, and the reinforcing plate 38 above the front and rear plates 32 and 33. An intermediate portion of the front edge portion of the semicircular fitting wall 44 and the reinforcing plate 38 located on both sides of the fitting wall 44 while projecting and formed entirely on the curved surface 48. The front and rear side plates 32 and 33 are formed with the front edge of the rectangular frame-shaped contact plate 49 formed by joining two adjacent reinforcing plates 38a in the shape of a rectangular frame as a flat surface. Further, it is formed so as to protrude slightly above both side plates 34 and 35.

On the other hand, the contact portion 47 on the other side of the auxiliary member 31 includes front and rear side plates 32 and 33, both side plates 34 and 35, a reinforcing partition plate 37, a reinforcing plate 38, and a fitting recess 43 as shown in FIG. Each of the rear end edges of the fitting wall 45 provided with is formed on a flush vertical surface 50.

The operation of the frame mold overtightening prevention auxiliary member 31 according to the present invention configured as described above will be described. The auxiliary member 31 of the present invention can use both surfaces of the contact portions 46 and 47 depending on the situation of the formwork construction site.

First, a three-type washer 9 inserted into a foam tie 6 is tightened with a nut 10 in a state where two supporting members 8 made of a single pipe are placed at a distance from an arithmetic tree 7 outside the mold 3. Thus, two so-called support members 8 for fastening the mold 3 from both sides are used. The case where the auxiliary member 31 of the present invention is used for normal mold clamping will be described with reference to FIGS.

In the use state shown in FIG. 3, the fitting wall 44 and the left and right rectangular frame-shaped contact plates 49 which are located on the one contact portion 46 side of the auxiliary member 31 of the present invention and protrude from the curved surface 48 are respectively the mold frame. 3, and the shaft portion 39 of the foam tie 6 is inserted into the semicircular concave groove 40, and the flange 11 at the tip of the foam tie 6 is inserted into the fitting recess 42, The collar 11 is mounted so that the tip of the collar 11 is flush with the tip of the semicircular fitting wall 44 and the rectangular frame contact plate 49.

Then, as described above, after the auxiliary member 31 of the present invention, to which the foam tie 6 is mounted, abuts the fitting wall 44 and the front edge of the rectangular frame-shaped contact plate 49 on the surface of the mold 6, the same as in the conventional case. Further, by tightening the nut 10 to the shaft portion 39, the bolt 5 of the cone 1 is screwed into a screw hole (not shown) provided in the collar portion 11 and connected to each other, and from a single pipe Each of the supporting members 8 is pressed by the three-type washer 9 and pressed against the mold 3.

At this time, even if the nut 10 is strongly tightened, only the tip of the collar portion 11 is crimped to the mold 3, which is not so-called point contact, and further, there are three members of the fitting wall 44 and each rectangular frame-shaped contact plate 49. Since the surface area of the contact surface is increased due to contact, the pressure applied to the collar portion 11 is dispersed, and as a result, overtightening of the collar portion 11 to the mold 3 is prevented.

6 and 7, the front / rear side plates 32 and 33, the side plates 34 and 35 located on the other contact portion 47 side of the auxiliary member 31 of the present invention, the reinforcing partition walls 37 and the reinforcement are provided. A vertical surface 50 that is flush with each edge of the plate 38 and the fitting wall 45 abuts on the mold 3, and the shaft portion 39 of the foam tie 6 is inserted into the semicircular concave groove 40. At the same time, the flange 11 at the tip of the foam tie 6 is inserted into the fitting recess 43 so that the tips of the flanges 22 and 23 and the rear end of the semicircular fitting wall 45 are flush with each other. Wear as it is.

As described above, after the auxiliary member 31 of the present invention with the foam tie 6 is brought into contact with the surface of the mold 3 with the vertical surface 50, the nut 10 is tightened on the shaft portion 39 as in the prior art. Thus, the bolt 5 of the cone 1 is screwed into a screw hole (not shown) provided in the collar portion 11 and connected to each other, and each support member 8 made of a single pipe is pressed by the three-type washer 9. Then, it is pressure-bonded to the mold 3.

At this time, even if the nut 10 is strongly tightened, not only the so-called point contact in which only the front end surface of the collar portion 11 is crimped to the mold 3, but the entire vertical surface 50 of the auxiliary member 31 is in surface contact with the contact surface. Since the surface area is increased, the pressure applied to the collar portion 11 is dispersed, and as a result, the overtightening of the collar portion 11 to the mold 3 is prevented.

As described above, the auxiliary member 31 of the present invention can be used by either pressing one of the contact portions 46 or the other contact portion 47 to the mold 3. As described above, two supporting members made of a single pipe are originally used. However, in a formwork installation site where only one supporting member 8 can be used, as shown in FIGS. In addition, the curved portion 9 a on one side of the type 3 washer 9 is covered with the support member 8, and the curved portion 9 b on the other side is formed on the curved surface 49 constituting the one contact portion 46 of the auxiliary member 31 of the present invention. It can also be used with a crown. And the effect | action of this invention auxiliary member 31 in this case is the same as the case where the said two support members 8 are used, Therefore It abbreviate | omits description.

DESCRIPTION OF SYMBOLS 1 Cone 2 Separator 3 Formwork 4 Hole 5 Bolt 6 Form tie 7 Arithmetic tree 8 Branch member 9 3 type washer 9a Curved surface 10 on one side Nut 11 Collar part 31 Formwork overtightening prevention auxiliary member 32 Front plate 33 Rear plate 34 35 side plate 36 rectangular parallelepiped cylinder 37 reinforcing partition plate 38 reinforcing plate 38a two reinforcing plates 39 shaft 40 semicircular concave groove 40a opening 41 insertion plate 42/43 fitting recess 44/45 fitting wall 46 47 Contact part 48 Curved surface 49 Square frame-shaped contact plate 50 Vertical surface

Claims (1)

An auxiliary member for preventing over-tightening of the formwork, which is installed between two support members arranged with a gap on the outer face of two arithmetic trees provided with a gap on the outer face of the mold A shaft portion on the front side of the foam tie is formed in the semicircular concave groove provided at the center portion of the auxiliary member for preventing excessive tightening of the mold formed of a hard synthetic resin having the same height as the arithmetic tree. Is inserted into the fitting recess at the tip of the semicircular concave groove so that the flange faces the tip edge of the auxiliary member for preventing excessive tightening of the formwork. According to one aspect of the present invention, there is provided an auxiliary member for preventing excessive tightening of a mold, characterized in that an area of a contact portion that comes into contact with the mold can be increased.

Images