JPS5922184Y2 - Washer for tightening concrete formwork - Google Patents

Description

[Detailed description of the invention] This invention is generally used to integrate the formwork board with the lumber by using a tightening rod with a wedge hole and a wedge when assembling concrete formwork. This article relates to an improvement of a washer for tightening concrete formwork called L type, and its purpose is to improve the strength and safety in use.

An embodiment will be described below with reference to illustrative drawings. Reference numeral 1 represents a backing plate portion, and 2 represents a leg portion that is bent and continuous from one end of the backing plate portion 1. As shown in FIG.

3 is a contact portion to the formwork plate which is continuously bent in an L shape outward from the end of the leg portion 2, and 4 is a piece of lumber material which is continuously bent inward from the free end of the backing plate. This is a detachment prevention part.

The washer 5 made up of the above-mentioned parts has both sides bent outward over its entire length, and is formed into a U-shape in cross section from the side walls 6 and the bottom plate 7.

Reference numeral 8 denotes a tightening rod insertion hole provided in the bottom plate 7 of the backing plate portion 1, and 9 is a tightening portion of the lumber material between the insertion hole 8 and the free end of the backing plate portion.

In the washer 5 configured as described above, an outwardly protruding rib 10 extending from the bent portion 13 between the backing plate portion 1 and the leg portion 2 to the leg portion 2 is provided in the center portion of the bottom plate 7; A surface 12 of the protruding rib 10 on the side of the backing plate part 1 with respect to the bent part 11 is configured to continuously extend flush with the surface of the bottom plate 7 of the backing plate part 1.

Although the protruding rib 10 is provided up to the middle of the leg 2 as shown in the figure, it may be provided over the entire length of the leg 2, or it may be provided between the formwork plate abutting portion 3 and the leg 2 as shown by imaginary lines. The bent portion between the two may be extended to a position where it can be reinforced.

Furthermore, both side walls 6 are bent portions 1 between the backing plate portion 1 and the leg portions 2.
It may be provided only in a partial area including 3.

The method of using the washer 5 described above is the same as that of the conventional one.

That is, as shown in FIG. 1, the tightening rod insertion hole 8 of the washer 5 is fitted into the tightening rod 15 whose inner end is locked inside the formwork plate 14, and the tightening rod insertion hole 8 of the washer 5 is fitted into the tightening rod 15 whose inner end is locked inside the formwork plate 14. 16 and 17 are arranged in a cross-shape, and the outer batt material 17 is positioned inside the batt material fastening part 9 of the backing plate part 1, and a wedge 18 is inserted between the both side walls 6 of the backing board part 1. By driving the tightening rods 15 into the wedge holes 19, the lumber 16 and 17 are integrated into the formwork board 14.

At this time, the leg portion 2 is substantially parallel to the tightening rod 15, and the form plate contact portion 3 is in pressure contact with the form plate 14.

The concrete formwork tightening washer of the present invention implemented and used as described above provides the following effects.

That is, since the bent portion 13 between the backing plate portion 1 and the leg portion 2 is formed into a U-shaped cross section for reinforcement, the bending radius of the new bent portion 13 is relatively large.

Therefore, the length of the wedge receiving surface A on the leg portion 2 side is shorter than the tightening rod insertion hole 8 of the backing plate portion 1.

The wedge receiving surface A on the leg 2 side of the tightening rod insertion hole 8 is an important part to prevent the wedge 18 from rotating around the tightening rod 15 due to the reaction force when driving the wedge. However, if the wedge receiving surface A is short, the reaction force when driving the wedge will not be sufficiently transmitted to the leg portion 2, causing the wedge receiving surface A to deform, and the entire backing plate portion 1 to be deformed, resulting in severe damage. It becomes a dangerous situation.

However, according to the present invention, the wedge receiving surface A can be extended by the protruding rib 10, and the wedge driving reaction force can be transferred to the leg 2.
Moreover, the protruding rib 10 reinforces the part from the bending part 13 to the leg part 2, which is important for strength, so it can be used safely even if the whole is made of a relatively thin plate. A washer for tightening concrete formwork is obtained.

In addition, the length of the leg part 2 may be half the length shown in the figure when directly tightening the flap material 16.

Further, the present invention can also be applied to a washer 20 for round flaps as shown in FIG.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal side view showing one embodiment of the present invention in use, Fig. 2 is a bottom view showing only the washer, Fig. 3 is a front view of the same essential parts, and Fig. 4 is another embodiment. FIG. 1...Packing plate part, 2...leg part, 3...
...Form plate contact part, 6...Both side walls, 7...
...Bottom plate, 8...Tightening rod insertion hole, 9...
...Flat material tightening part, 10...Protruding rib.

Claims (1)

[Scope of utility model registration request] A fastener with a wedge hole provided in the backing plate part, comprising a backing plate part and a leg part connected from one end of the backing plate part, the end of the leg part having a contact part to the formwork board, and a wedge hole provided in the backing plate part. A latch material tightening portion is provided between the insertion hole of the attachment rod and the free end of the backing plate, and at least the portion including the bent portion between the backing plate and the leg is provided with both sides outside. In a washer for tightening concrete formwork which is bent toward the side and formed into a U-shape in cross section, an outwardly protruding rib extending from the bent part between the backing plate part and the leg part to the leg part is provided. , is provided in the center of the bottom plate between both side walls, and the surface of the protruding rib on the side of the back plate part from the bent part extends continuously and flush with the bottom plate surface of the back plate part. washer for use.