JPS60233270A - Mold frame interval holder in concrete mold frame construction - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] (Purpose) The formwork spacing holder used in conventional exposed concrete formwork construction has male threads cut at both ends of the rod-shaped body.
The structure was such that a flange for locking the formwork was provided further inward of the male screw.

When using it, place the formwork spacing holder in a predetermined position, drive a plywood board or other formwork material from the outside of the holder to the brim with a hammer, etc., and then tighten the mold with a fastener that has a female thread that matches the male thread. Pinch and secure the frame material. Since the conventional formwork spacing holder had a flat cross-sectional shape at the end, it was difficult to drive the formwork material into it. Furthermore, even if it could be driven in, there was a risk that cracks would occur around the hole created by inserting the holder. Another disadvantage is that if the cracks are too large and spread over the collar, the concrete inside will seep out. The object of this invention is to eliminate the following drawbacks by sharpening both ends of the exposed concrete 1 to formwork spacing holder.

(Structure) Next, the structure of the present invention will be explained according to an embodiment shown in the drawings. Concrete 1 - A holder 1 that is inserted into a wall formwork and used to maintain the interval therebetween is a rod-shaped body, and at both ends thereof, there are conical sharp parts 2 that are pointed in the length direction of the holder 1.
, 2. The purpose of making both ends sharp is to make it easier to drive the forms 3, 3, so they do not necessarily have to be sharp, and may be rounded as long as they have a shape that tapers toward the tip. . The holder 1 has male threaded parts 5, 5 for attaching fasteners 4, 4 of the formworks 3, 3 inwardly than the sharp parts 2, 2. On the other hand, the fastener 4°4 has an acid thread cut therein.

The holder 1 has a formwork 3 further inward of the male threaded portion 5.5.
, 3 has collar portions 6, 6 for locking.

The flange portions 6, 6 may be formed by expanding the holder 1 itself, or a washer separate from the holder 1 may be fitted therein.

When using the formwork spacing holder 1 of the present invention having the above structure for concrete formwork work, plywood or other formwork 3, 3 is driven into the sharp parts 2, 2 side of the holder 1, and the brim It is locked at parts 6, 6.

After that, the formworks 3, 3 are fixed with formwork fasteners 4, 4.

Concrete 1 to 7 is poured into the space formed by the formworks 3 and 3 and hardened. After the concrete 7 hardens, the formwork fasteners 4, 4 and formwork 3, 3 are removed. The form spacing 1 is then cut off from the external thread 5.5, leaving the collar 6.6 in the concrete 7.

(Effect) As mentioned above, this invention
・In formwork work, the formwork spacing holder 1 has sharp parts 2, 2 at both ends, and a male screw 5 is installed inwardly from the sharp parts 2, 2.
, 5 are cut, and collars 6, 6 for locking the formworks 3, 3 are attached to the inner side of the male threads 5.5. There is an effect that it is easy to drive the holder 1 into the holder 1. In other words, if both ends of the holder 1 have the same thickness as the holder 1 itself, it will be difficult to cast the formworks 3, 3, and even if it is possible to do so, cracks will occur in the formworks 3, and the concrete 7 inside will leak through. However, if both ends are made with sharp parts 2, 2 as in the present invention, there is less resistance when driving the formworks 3, 3, and it is not only easy to do so, but there is no risk of cracking.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; Fig. 1 is a front view of a formwork spacing holder, and Fig. 2 is a view of a state in which the formwork is fixed to the formwork spacing holder and concrete is poured. FIG. 100. formwork spacing holder, 260. sharp point, 318. Formwork, =4-401. Fastener, 501. Male thread, 618. Brim, 7
01. Concrete patent applicant Toshin Sangyo Co., Ltd. Representative patent attorney Toru Ikehata − ] □=] Figure 1 Figure 2

Claims (1)

[Claims] It has an elongated rod-like shape with sharp parts at both ends, a male thread is cut inward from the sharp part, and a formwork locking collar part is further inward from the male thread. A formwork spacing holder in exposed concrete formwork work, characterized by being provided.