JPH078488B2 - Formwork for manufacturing concrete specimens - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Purpose of the Invention><Industrial Field of Application> The present invention is used for inspecting the physical strength of concrete when manufacturing concrete structures, buildings, and other concrete products. The present invention relates to a mold for manufacturing a concrete specimen.

<Background of the Invention> In the case of a concrete building or the like, the same raw concrete that has been used to confirm the safety and reliability of the concrete has been sampled and provided in a circular bar shape as shown in Fig. 9. Specimen A was made and various physical strengths were measured. In the case of manufacturing such a test piece A, conventionally, as shown in FIG. 8, a cast iron manufacturing mold in which a tubular body portion is vertically separable and a bottom plate is also detachable Frame 1'was used. That is, each of the side body portions 2'having a cylindrical shape is constructed by aligning each of the side body frames 3'in the middle, and the bottom plate 6'is combined therewith. Each of these separate members is a nut which is screwed into the bolt B at four positions with respect to the side trunk portion 2'and two positions between the side trunk portion 2'and the bottom plate 6 '. It is fixed by tightening with N.
Because of this structure, first of all, it is made of cast iron, the total weight is extremely heavy, and the weight is almost equal to the weight of the specimen A to be stored inside. However, it was at best to handle each piece at a time, and the handling was extremely troublesome.
Further, since the bolts and nuts are tightened at six places, the workability is not always good. Further, since this cast iron material is relatively easily compatible with concrete, it is necessary to always sufficiently apply machine oil or the like to the surface of the mold in consideration of separation from the sample A or concrete adhering to the surroundings. , The maintenance work was extremely troublesome. Even if such measures are taken, if concrete, etc., adheres to the joint surfaces of the individual side frame parts and solidifies, the assembly will not work correctly, so it is necessary to remove them. It is said that even in this respect, very troublesome maintenance work is required. Furthermore, this type of concrete specimen A is tested by sampling three specimens A each one week and four weeks later, and obtaining an average value of the test results. Therefore, it would be extremely convenient if it was possible to handle the combination of three specimens A to be used for one test. However, in the case of the conventional type, which has an extremely heavy overall weight, it is extremely unlikely that the three pieces will be handled as one set, and the sample A will be handled one by one. For this reason, the test piece A may be confused and the test result may be inaccurate.

<Technical Items Attempted to Develop> As described above, the present invention solves the drawbacks of the formwork for manufacturing concrete specimens of this type, which has been hardly standardized in the past. The purpose of the present invention is to develop a new mold for manufacturing a concrete specimen that is lightweight and easy to handle.

<Structure of the Invention><Means for Achieving the Purpose> That is, the mold for producing a concrete specimen according to the present invention comprises a pair of semi-cylindrical side body frames made of a plastic material, which are combined in a cylindrical shape to form a side body portion. Further, a bottom plate which is detachably attached to the side body portion in an externally fitted state is provided on the lower surface thereof, and one or a plurality of tab-shaped tightening frames are provided around the side body portion. Therefore, it is intended to achieve the above object.

<Examples> The present invention will be specifically described below based on illustrated examples. Reference numeral 1 is a mold for producing the concrete specimen A according to the present invention, and the entire shape is a bottomed cylindrical shape. First, the cylindrical side trunk portion 2 is made of, for example, a plastic material such as vinyl chloride resin, and the like, which is vertically divided into two, and each side trunk frame unit 3 is formed.
The side body frame unit 3 has an inner peripheral surface that is a smooth circular arc surface, and has reinforcing ribs 4 appropriately on the outer side thereof. Then, the side body frame single body 3 comes to be concavo-convexly joined by the joint concavo-convex 5, and constitutes the side body portion 2 having a cylindrical shape as a whole. A bottom plate 6 is provided for such a side body portion 2, and the bottom plate 6 is provided with a bottom plate tightening frame 7 which is screwed into the bottom portion of the side body portion 2 in an externally fitted state. Be assembled into. Of course, even if the bottom plate 6 and the bottom plate tightening frame 7 are not formed separately as in this embodiment, but a member corresponding to the bottom plate tightening frame 7 is integrally formed on the bottom plate 6, it does not matter. Absent. Reference numeral 8a is a female screw engraved on the inner peripheral surface of the bottom plate tightening frame 7, and 8b is a male screw engraved on the lower end portion of the side body portion 2 and screwed with the female screw 8a. Further, a tab-shaped tightening frame 9 is externally fitted from above the side trunk portion 2, and the tightening frame 9 has a female screw 10a on its inner surface. It is to be screwed onto the male screw 10b formed on the outer peripheral portion of 2. A downwardly widened taper portion 11 is formed below the male screw 10b, and the lower end edge of the tightening frame 9 presses the taper portion 11 as the tightening frame 9 is tightened. Make sure that the frame 3 is tightened more securely. Further, the reference numeral 12 is a top plate, and the ready-mixed concrete A is provided in the manufacturing form 1 (for convenience, the ready-mixed concrete is also shown as the reference numeral A).
It is for pressing the upper side when filling, and, for example, a glass plate or an iron plate having an appropriate weight, further, an iron plate coated with plastic from both sides is applied. The manufacturing mold 1 described above may be composed of a transparent plastic body, for example, when it is desired to observe the inside sufficiently. In this way, the state of the green concrete A filled inside can be observed. When considering the abrasion resistance, hard chromium plating or hard fluororesin coating or the like is formed on a part or all of the contact surface of the production form 1 and the top plate 12 with the fresh concrete A. May be. In addition to the chrome-plating method, for example, a chrome-plated metal plate may be lined on the side trunk frame unit 3, the bottom plate 6 or the like.

Although the manufacturing mold 1 itself according to the present invention has the specific structure as described above, the carrier 14 for further improving the convenience of handling this will be described. This is because, in the test of the concrete specimen A of this type, three samples are handled as one set, so that three samples can be handled as one set. That is, the carrier 14 is provided with a holding portion 16 into which the manufacturing frame 1 can be fitted on the substrate 15 and a handle 17 so that the three specimens A can be handled as a group. Is. In this embodiment, as an example, only the central portion of the holding portion 16 has a high bottom portion, so that the manufacturing formwork 1 set here is also configured to have a different height. There is. Since the top plates 12 have a certain size, when they are arranged at exactly the same height, the top plates interfere with each other to provide a sufficient lid-closing action for each manufacturing form 1. This is because there are cases where you do not get it. Of course, if there is no such possibility, all the holding portions 16 may have the same height.

The present invention has a specific configuration as described above, and the following is to handle this. First, in the manufacture of the sample A, the side body frame single body 3 constituting the side body portion 2 is assembled into a cylindrical shape, and then the bottom plate tightening frame 7 containing the bottom plate 6 is screwed in from below the side body portion 2. Then, the tightening frame 9 is screwed in from above. When the screwing by the tightening frame 9 is further advanced, the lower end edge of the tightening frame 9 and the taper portion 11 come into contact with each other, so that the tightening frame 9 pushes the taper portion 11 further. For No. 2, the assembled state is surely made firm. After doing so, the ready-mixed concrete A to be sampled is filled in the manufacturing form 1, and then the upper part thereof is smoothed and evenly pressed by the top plate 6. At this time, the following three “methods for producing concrete specimens” that the present inventor has already proposed (Japanese Patent Application No.
No. 57-13442, 57-48419, 57-158673) may be applied. After the curing period of one week or four weeks has elapsed after the above construction, the tightening frame 9 and the bottom plate tightening frame 7 are removed from the side body portion 2, and the side body portion 2 is separated for each side body frame unit 3. The sample A which is divided and solidified inside is taken out. By the way, in the case of this kind of plastic material, since the releasability from the concrete material is generally good, it is almost unnecessary to separately apply a release material.

Regarding the storage and transportation of such manufacturing form 1,
As shown in the figure, if the side body portions 2 are combined in a wrong shape or they are stacked in the same direction, they can be stored or transported in a smaller space. In this embodiment, since the bottom plate 6 is separate from the bottom plate tightening frame 7, when the bottom plate 6 that is most worn is worn out, it can be reused by replacing only the bottom plate 6.

<Effects of the Invention> Since the present invention has the configuration as described above, since the whole is a plastic material with good peelability from concrete, cleaning at the time of use, maintenance work, etc. are extremely simple. I will get it. Further, since it is extremely lightweight in itself, it is possible to easily handle, for example, a set of three pieces, and in this respect, accidents such as sample mix-ups do not occur and accurate measurement can be performed. Further, even if the synthetic resin material is naturally inferior in strength to cast iron or the like, the bottom plate 6 which directly acts on the assembling thereof.
Through the bottom plate tightening frame 7 and the tightening frame 9,
Since it is assembled in a so-called tag shape and can be integrated in a form that compensates for the lack of strength, the material itself is inferior in strength to cast iron etc., but as a whole, it has sufficient strength for practical use. Can be demonstrated.

[Brief description of drawings]

FIG. 1 is a partially broken perspective view showing a mold for producing a concrete specimen according to the present invention, FIG. 2 is an exploded perspective view showing the same as above, FIG. 3 is a vertical side view showing the same as above, and FIG. 4 is a horizontal sectional view showing the same. FIG. 5 is a perspective view showing a carrier in the case where three production molds are combined into a set, FIG. 6 is a vertical front view of the same as above, FIG. 7 is a perspective view showing a stored state of the production mold, and FIG. The figure is a partially broken perspective view showing a conventional manufacturing mold, and FIG. 9 is a perspective view showing a concrete test piece. 1; Manufacturing formwork 2; Side body part 3; Side body frame alone 4; Reinforcing ribs 5; Joint irregularities 6; Bottom plate 7; Bottom plate tightening frame 9; Tightening frame 11; Tapered part 12; Top plate 14; Carrier A: Specimen

Claims (1)

[Claims] 1. A side trunk portion is formed by combining a pair of semi-cylindrical side trunk frames made of a plastic material into a cylindrical shape,
Further, on the lower surface thereof, a bottom plate which is detachably attached to the side body portion in an externally fitted state is provided, and one or a plurality of hoop-shaped tightening frames are provided around the side body portion. Formwork for manufacturing.