JPS647330Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a cylindrical formwork for testing concrete to investigate various physical properties such as concrete compressive strength.

Conventionally, this type of formwork consists of a total of three cast iron products: two half-cylindrical formworks divided into two and one bottom plate, and in order to combine these into one formwork, it is necessary to , the vertically divided semi-cylindrical formwork has a butterfly-shaped knob 4
By tightening two screws in the horizontal direction, the bottom plate combines the horizontally tightened cylindrical formwork by tightening two screws in the vertical direction to form one formwork for concrete testing. Because it is handled relatively frequently by repeating concrete filling, curing, demolding, and cleaning, a thick cylindrical membrane is used, and reinforcing ribs are added to prevent the cast iron material from cracking.

However, hundreds of pieces are often required for one test, and each piece weighs 10.7 kg (10 cm x 30 cm).
mold), further 23.2 after concrete filling
Kg/piece, which is extremely heavy for testing purposes, and for tests that require uniformity and precision, the workability of transportation and handling is poor and multiple hands are required. Furthermore, since the butterfly screws protrude outward from the formwork, there is a risk of damage due to rolling. Furthermore, since it is not designed for small-scale transportation, it has a large volume and requires space for loading, resulting in a failure rate.

Therefore, the purpose of this invention is to provide a formwork that can eliminate the above-mentioned drawbacks, and the features of this invention are as follows. In other words, 1. In order to reduce weight, the conventional cast iron material was eliminated and the product was made of stainless steel and iron plates. The product was coated with a polymeric synthetic resin for rust prevention and durability, and the cleaning and oiling processes were improved. Simplify.

2. In order to shorten the assembly process, the bottom plate and the semi-cylindrical formwork are welded into one body, the vertical plane of the semi-cylinder and the horizontal bottom plate are surely at right angles, the number of pieces to be assembled is a minimum of two, and the This is facilitated by the dimensions of the ribs and the positioning grooves on the bottom plate, increasing test accuracy and at the same time saving labor for polishing the finished concrete specimen.

3. Assembling with butterfly screws is time-consuming, so by devising a steel fastening device, one-touch fastening is possible, and the elastic force of the steel material is used to press against the bottom plate and at the same time tighten the semi-cylindrical formwork. It is extremely easy to attach and detach because it is crimped onto the adhesive surface and can be completely combined.

Further, since the U-shaped wedge of the fastening device has a rationalized inclination angle for fastening, there is no problem even if the contact position shifts due to the wedge length even if there is a slip edge or manufacturing error.

4. In order to solve the problem of the butterfly screw protruding outward from the tube body, we devised a fastening device using a U-shaped wedge, which allowed us to approach the cylindrical membrane plate and operate it in the vertical direction. There is no part that protrudes further outward. Further, the penetration groove of the U-shaped wedge is cut from the same steel material and integrated, so the groove is protected and will not be damaged.

5. Another weight reduction measure is to balance the heights of the cylindrical membrane plate and semicircular ribs, rationalize the thickness of each, prevent deformation, and minimize weight.

6. In order to eliminate the inconvenience of small transportation and handling of cargo, several perforations are provided in the upper semicircular rib, and a hanging metal fitting allows for small transportation of several forms at once. . This is convenient for taking out and putting in the aquarium for curing, and is easy to arrange for each test type, making it highly efficient.

7. The tightening force can be changed freely by changing the material and thickness of the U-shaped wedge.

Hereinafter, the structure of a formwork for concrete testing will be explained based on FIGS. 1 to 5 showing examples of this invention.

In Fig. 1, a formwork 1 with a bottom plate is a semi-cylindrical formwork with a circular bottom plate 3 fixed to the bottom of the formwork, and a semi-cylindrical formwork 2 is a formwork 1 with a bottom plate.
It has the same radius as the radius of the semi-cylindrical part, and becomes the other side of the formwork 1 with a bottom plate, and when these two are combined, 1
formwork. The formwork 1 with a bottom plate and the semi-cylindrical formwork 2 are divided into two parts in order to take out a concrete specimen. The semi-cylindrical membrane plate 4 is reinforced by semi-circular ribs 5, 6 of different heights, vertical ribs 10, and several support ribs 20 attached to the semi-circular ribs 5, and is also semi-cylindrical. The membrane plate 7 is reinforced by semicircular ribs 8, 9, a longitudinal rib 11, and several supporting ribs 20 attached to the semicircular rib 8. The fastening device 12 is a device that fastens and unites the formwork 1 with a bottom plate and the semi-cylindrical formwork 2.

In FIG. 2, the parallel guide groove 16 is a U-shaped wedge 1.
It is one of 3. The tapered guide groove 17 has a square groove into which a long can is inserted, and is fixed to the semi-cylindrical membrane plate 4, and the tapered guide groove 17 has a square groove into which a short can, which is the other side of the U-shaped wedge 13, is inserted. It is fixed to the semi-cylindrical membrane plate 7.

In FIG. 3, the groove of the parallel guide groove 16 has a parallel surface 14 parallel to the joining surface of the semi-cylindrical membrane plates 4 and 7, and the groove of the tapered guide groove 17 has a parallel surface 14 parallel to the joining surface of the semi-cylindrical membrane plates 4 and 7. It has an inclined surface 15 closer to the joining surface with the joining surface, maintains an inclination angle θ ₁ with respect to the joining surface, and is fixed to the semi-cylindrical membrane plate 4 and the semi-cylindrical membrane plate 7, respectively. The "long hook" inner surface of the U-shaped wedge 13 inserted into the guide groove of the parallel guide groove 16 and the tapered guide groove 17 remains parallel to the groove inner surface of the parallel guide groove 16, and the "short hook" inner surface of the U-shaped wedge 13 is kept parallel to the groove inner surface of the parallel guide groove 16. has an inclination angle θ ₂ with respect to the joint surface, and θ ₁
＞θ ₂ .

In Figures 4 and 5, the perforations 18 are provided in the semicircular ribs 5 and 8, into which the bent tip of the small carrying hardware 19 made of iron plate or reinforcing bar can be easily inserted, and two to three molds can be inserted at once. Frames can be transported and arranged. Further, the semicircular ribs 5, 8 are formed in the perforation 1.
8 is reinforced by a plurality of support ribs 20.

Next, we will explain the gist of creating concrete specimens based on this idea. For the bottom plate, after cleaning and oiling the inner surfaces of the formwork 1 and the semi-cylindrical formwork 2, align the vertical joining surfaces of both, and guide the "long can" of the U-shaped wedge 13, which has a surface parallel to the joining surface, in parallel. Insert into groove 16 and insert “short can”
is brought into contact with _the tapered guide groove 17, pressed in _the Q direction shown in FIG. At the same time, it is pulled horizontally and fastened to the formwork 1 with a bottom plate. Moreover, when separating, it can be easily removed by hitting the lower part of the "long can" of the U-shaped wedge 13 in the P direction. At this time,
The semicircular ribs 5 and 6 of the formwork 1 with a bottom plate protrude slightly longer than the joint surface, making it easy to position the semicylindrical formwork 2. 9 is made a little shorter than the joining surface. Further, the steel material of the U-shaped wedge 13 is designed to have a cross-sectional shape that has the elastic force required to fasten both forms.

As mentioned above, the formwork for concrete testing according to this invention not only has formwork standards, but also has the ability to change the wall thickness of the pipe body and ribs and increase the number of ribs for various sizes. This can be achieved by increasing the number of fastening devices and changing the materials of each part, and is lighter and lighter than the conventional method.
It is simple, durable, and economical, and the effects of high efficiency are enormous.

[Brief explanation of drawings]

The figures show an example of this invention; Figure 1 is a side view of a formwork for concrete testing;
_{FIG. 3} is a cross section taken along line F-F ₂ of FIG. 2, FIG. 4 is a plan view, and FIG. 5 is a conceptual diagram of the transportation tool. 1...Formwork with bottom plate, 2...Semi-cylindrical formwork, 3...
Bottom plate, 4, 7... Semi-cylindrical membrane plate, 5, 6, 8, 9...
...Semicircular rib, 10,11,20...Vertical rib, 1
2... Fastening device, 13... U-shaped wedge, 14... Parallel surface, 15... Inclined surface, 16... Parallel guide groove, 1
7...Tapered guide groove, 18...Drilling, 19...
...Small transportation hardware, 20...Support ribs, θ ₁ , θ ₂ ...
Tilt angle.

Claims (1)

[Scope of utility model registration request] In cylindrical formwork for concrete physical property testing,
It consists of a formwork in which a semicylindrical membrane plate reinforced with semicircular ribs is fixed to a circular bottom plate at right angles, and a semicylindrical formwork having the same radius as the semicylindrical membrane plate and reinforced with semicircular ribs, A fastening device is provided that allows a U-shaped wedge having a predetermined inclination angle to facilitate the fastening and separation of both formworks to be inserted into a groove provided in the fabric of both formworks to join them together;
A formwork for concrete testing characterized by having a plurality of transport holes arranged in the reinforcing ribs.