JPH0336909Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an improvement of a mold for forming a specimen for preparing a mortar strength test specimen.

[Conventional technology]

Generally, the strength characteristics of cement mortar vary depending on the material, the mixing ratio of the material, and the curing method. Therefore, in order to design a mortar with the desired allowable stress level, we created a specimen and conducted a strength test to confirm whether the mortar constructed using a given material had the desired strength. It is customary to do this.

By the way, in forming a specimen for conducting such a strength test, conventionally, as shown in FIG. ', and between the left and right horizontal frame plates 22, 22', a plurality of vertical frame plates 2
3 are arranged in parallel in combination, and then clamped by a pressing mechanism using a stopper 25 provided on the outside of the horizontal frame plates 22, 22', that is, on both left and right sides of the board 21, and a screw 28 having a stopper 24. ,
The left and right horizontal frame plates 22, 22' and the vertical frame plate 23
is fixed on a substrate 21 to form a formwork exhibiting a grid pattern, and the space within this formwork is filled with mortar, hardened, and cured for a predetermined period to form a specimen of specified dimensions.

[The problem that the idea aims to solve]

However, in this molding frame, the means for applying a pressing force to the lateral frame plate 22' consists of rotating a screw 28 having one abutment 24 that comes into contact with the outer surface of the lateral frame plate 22'. And the tool 24
It is configured so that it can be brought into contact with and pushed out. Therefore, when the abutment tool 24 is brought into contact with the side frame plate 22' and pushed out, the side frame plate 22' receives a rotational force, and one end of the side frame plate 22' is lifted up. Also, this side frame plate 2
As 2' rises, the vertical side frame plate 23 also rises. As a result, the molded specimen is forced to deform, resulting in dimensional deviations. Therefore, there was a problem that the accuracy of the strength test was impaired. In addition, due to this lifting phenomenon, some of the moisture in the mortar flows out of the formwork, changing the mixing ratio, resulting in a specimen with a different composition from the mortar that was originally tested. It was hot.

In any case, it has been extremely difficult to conduct accurate tests on specimens molded using this conventional mold. By the way, in the past, in order to prevent the horizontal and vertical frame plates from lifting up, during formwork erection work, the frame members were hit with a mallet to prevent them from lifting up, and at the same time, the frame members were assembled while maintaining perpendicularity to the board. ing. However, the process was complicated, and there were problems in that lifting could not be sufficiently prevented and it was difficult to obtain specimens that were uniform and had the desired composition.

The present invention was proposed in order to solve the above problems, and its purpose is to prevent the horizontal and vertical frame plates forming the formwork from rising in a formwork for forming mortar specimens. To provide a worry-free formwork for molding a mortar specimen.

[Means to solve the problem]

As a means for achieving the above object, the present invention comprises a quadrilateral substrate, a pair of left and right horizontal side frame plates, and a plurality of vertical side frame plates, and on the upper surface of one side of the substrate,
It has a stopper that one of the left and right side frame plates comes into contact with, and the upper surface of the opposite side is equipped with a threaded rod-type pressing mechanism that has a push plate that also comes into contact with the other side frame plate. The pair of left and right horizontal frame plates are arranged in parallel between the push plate of the pressing mechanism and the stopper, and the plurality of vertical frame plates are arranged between the left and right horizontal frame plates. They are arranged in parallel at regular intervals, and then, by operating the pressing mechanism, the horizontal frame plates and the vertical frame plates placed on the substrate are sandwiched between the stopper and the pressing plate of the pressing mechanism. In a formwork for forming a mortar specimen, in which a formwork that is fastened and fixed and exhibits a mesh shape is configured on a substrate, the contact surfaces of the stopper, the side frame plate, and the push plate of the press mechanism are respectively set on the outside. This is due to the fact that the contact surface is formed with a downward slope.

[Effect]

The formwork for forming mortar specimens according to the present invention is
As explained above, the surface where the stopper provided on one side of the board contacts the side frame plate, and the surface where the push plate of the pressing mechanism provided on the opposite side of the board and the side frame plate contact, respectively. Since it is formed on an inclined surface that slopes downward toward the outside, after placing the left and right horizontal frame plates and multiple vertical frame plates on the board in the appropriate manner, press the left and right horizontal frame plates. When the mechanism is operated to clamp and fix, since each of the contact surfaces is a downwardly inclined slope, a component of the clamping force by the pressing mechanism acts downward.
That is, it acts perpendicularly to the substrate surface. As a result, the horizontal frame plates and the vertical frame plates, which are members forming the formwork, do not rise above the substrate surface.

〔Example〕

Next, the structure and operation of the present invention will be specifically explained based on embodiments shown in the drawings. First, as shown in FIG. 5, the mold for forming a mortar specimen is made by combining four vertical frame plates 3 in parallel between a pair of left and right horizontal frame plates 2, 2' facing each other, and forming a substrate 1. the pair of left and right side frame plates 2, 2' placed above the board 1.
It is clamped and fixed by stoppers 5 provided on both sides of the top and a presser plate 6 having a pressing mechanism, so that a grid-shaped formwork can be constructed on the substrate 1. Note that a stopper 5 provided on one side of the board 1
In the figure, two holding plates 6 are provided on the left side of the board 1 using bolts, and a presser plate 6 having a pressing mechanism provided on the opposite side is fixed to the upper right side of the board 1 via a bracket 7. As shown in FIG. 3, the pressing mechanism is provided with a bush 9 on its bracket 7,
A screw shaft 8 is screwed onto this bush 9 and supported so as to be movable forward and backward toward the stopper 5 side. ,
When the screw shaft 8 is rotated, the movement in the axial direction is transmitted to the push plate 6. A handle 11 is provided at the rear end of the screw shaft 8, and the screw shaft 8 can be rotated using the handle 11. Further, 12 and 13 are washers and screws provided on the distal end surface of the screw shaft 8 to prevent the push plate 6 from coming off. Then, the side frame plates 2, 2'
A downwardly inclined inclined surface is formed on each outer side surface 2a, 2a'. A stopper 5 that comes into contact with this outer surface (slanted surface) 2a, 2'a
A push plate 6 that comes into contact with the contact surface 5a of
The abutting surfaces 6a of the above-mentioned outer surfaces 2a and 2' are also
It is formed on a downwardly inclined surface corresponding to a. Incidentally, reference numeral 14 shown in FIG. 2 is an end plate for regulating the horizontal frame plates 2, 2' and the vertical frame plate 3 so that they are placed correctly on the substrate 1.

Since the formwork according to the embodiment is constructed as described above, the horizontal frame plates 2, 2' and the vertical frame plate 3 are arranged on the substrate 1, and the screw shaft 8 is rotated by the handle 11. When the push plate 6 is moved forward,
The left horizontal frame plate 2, whose movement in the longitudinal direction is restricted by the end plates 14, 14, comes into contact with the stopper 5 via the vertical frame plate 3. That is, when the push plate 6 is brought into contact with and pressed against the right side frame plate 2', the side frame plate 2' is pushed to the left.
At this time, the pressing force acting on the side frame plate 2' generates a downward component force due to the inclined surfaces of the outer surfaces 2a and 2'a. As a result, the horizontal frame plates 2, 2' come into close contact with the substrate 1 surface, and the vertical frame plates 3, 3, .

[Effect of idea]

As described above, in the mold for forming a mortar specimen according to the present invention, the outer surfaces of the opposing lateral frame plates are respectively sloped surfaces that slope downwardly toward the outside, and the push plate and the push plate on the substrate that come into contact with these are sloped surfaces that slope downwardly toward the outside. Since the surface of the stopper is also formed into an inclined surface corresponding to the inclined surface, even if the horizontal frame plate is pressed by the push plate of the pressing mechanism, not only the horizontal frame plate but also the vertical side frame plate will not be lifted upward. do not have. Furthermore, moisture in the unsolidified mortar in the formwork will not leak out. Therefore, there is no need to worry about disturbing the water content ratio. As a result, the specimen may be different from the mortar planned for construction,
Alternatively, there is no need to worry about the specimen having a defective shape due to the lifted horizontal and vertical frame plates, and it is possible to create a specimen having an accurate shape and composition as desired. That is, by using a specimen obtained using this molding frame, it is possible to perform tests accurately, and to avoid wasting time and money due to the occurrence of defective products.

[Brief explanation of the drawing]

Figure 1 is a front view of a conventional mold for forming mortar specimens, Figure 2 is a front view of a mold for molding mortar specimens according to the present invention, Figure 3 is a plan view of the same, and Figure 4 is a screwdriver. FIG. 5 is an enlarged sectional view of the vicinity of the shaft tip and a perspective view of the molding frame. 1... Board, 2, 2'... Lateral frame board, 2a,
2'a... Outer surface (slanted surface) of horizontal frame plate, 3... Vertical frame plate, 5... Stopper, 5a... Contact surface of stopper, 6... Push plate, 6a... Push plate Contact surface (slanted surface), 8... Screw shaft, 10...
bearing.

Claims (1)

[Claims for Utility Model Registration] It has a quadrilateral board, a pair of left and right horizontal side frame plates, and a plurality of vertical side frame plates, and on the upper surface of one side of the board, one of the pair of left and right side frame plates is provided. A stopper is provided on which the side frame plate comes into contact, and a threaded rod-type pressing mechanism is provided on the upper surface of the opposite side and has a push plate on which the other side frame plate comes into contact. The pair of left and right horizontal frame plates are arranged in parallel between the left and right horizontal frame plates, and the plurality of vertical frame plates are arranged in parallel at regular intervals between the left and right horizontal frame plates. By operating the pressing mechanism, the horizontal frame plate and the vertical frame plate are clamped and fixed using a stopper and a presser plate of the pressing mechanism, and a formwork having a grid shape is formed on the substrate. In the mold for forming a mortar specimen, the contact surfaces of the stopper, the side frame plate, and the pushing plate of the pressing mechanism are each formed into a contact surface consisting of an inclined surface that slopes downward to the outside. Characteristic formwork for forming mortar specimens.