JPH082599Y2 - Concrete slump test equipment - Google Patents

Description

[Detailed description of the device]

[0001]

[Industrial application] The present invention shows the fluidity of concrete when an uncured raw concrete (mixed) sample is stored in a predetermined container (JIS standard product) and the sample container is gently removed. The present invention relates to a concrete slump test device to be tested.

[0002]

2. Description of the Related Art JIS is a slump test for concrete.
According to (Japanese Industrial Standards), the bottomless sample container 11 for collecting concrete has a height of 300 (m / m) as shown in FIG. 4 and FIG.
/ M), 200 (m / m) in the shape of a cone, and handles 12 and 12 are provided on both sides near the upper part, and the sample container 11 is placed on a horizontal flat plate 9 and collected in the container 11. Freshly-mixed fresh concrete is poured from the top opening and divided into three times, and a certain number of times is struck with a stick to accommodate a fixed amount. Next, when the storage of the sample is completed, the container 11 is pulled upward from the flat plate 9 with the handles 12 and 12 at a slow speed, so that the fresh concrete in the container 11 forms a mountain shape on the flat plate 9. Since it collapses, the height of the sample apex from the flat plate 9 is measured at this time to determine the fluidity of the concrete.

[0003]

However, in the above-mentioned conventional example, the sample container is manually removed from the flat plate. In other words, since the sample container is pulled upward by the handle, there are individual differences in the pulling speed, and it is easy to collapse due to additional movement to the concrete due to hand shake to the left and right, so hand shake and individual differences in the pull speed affect However, there was a drawback that accurate measurements could not be made. Therefore, the present invention is intended to provide a device that eliminates such measurement variations due to individual differences and maintains constant measurement conditions regardless of the measurer.

[0004]

The concrete slump test apparatus of the present invention comprises a pair of left and right vertical guide rods erected on a pedestal, and a horizontal guide vertically supported by each vertical guide rod so as to be vertically movable. The mounting plate and the respective upper ends thereof are supported by the horizontal mounting plate so as to be horizontally slidable, and the respective lower ends are supported by the pedestal so as to be slidable in the horizontal direction. A pair of intersecting rods that are rotatably connected to each other, an elevating mechanism that vertically moves the intersecting portions of the intersecting rods, and above the horizontal mounting plate. A frustum-shaped sample container, which is fixedly supported so that its lower end is in close contact when the horizontal mounting plate is in the upper position, and whose upper end face and lower end face are open, is provided.

[0005]

[Operation] After the horizontal mounting plate is lifted and brought into close contact with the lower end of the sample container, a predetermined amount of fresh concrete is squeezed and filled into the sample container, and then the horizontal mounting plate is moved at a predetermined speed. The mounting plate and the sample container are completely separated by descending to a specified height, and the height of the fresh concrete on the mounting plate that collapses at that time is measured to determine the fluidity of the concrete. To do.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described in detail with reference to the embodiments shown in the drawings. As shown in FIGS.
The support frame 2 of the horizontal sample mounting plate 9 is supported to rise and fall freely on the vertical guide rods 7, 7 provided upright at both ends of the guide rod 1, and the guide rods 1 provided laterally on the support frame 2 and the pedestal 1 are also provided. The upper and lower ends of the pair of crossing rods 3 and 3 are pivotally connected to each other between 'and 2'through a sliding tool, and an intersection point 6 of the crossing rods 3 and 3 is fixed to the center of the pedestal 4 ( The upper and lower ends of the piston rod 5 of the (raising and lowering drive device using a rack rod and a pinion may be used),
Further, arms 10 and 1 horizontally projecting from the respective columns are provided on the upper ends of the columns 8 which are erected on both ends of the pedestal 1.
A bottomless sample container 11 in the shape of a truncated cone
Place with the center line of the truncated cone up and down. As described in the conventional example, the sample container 11 has dimensions and the like defined by the JIS standard, and the grips 12, 12 provided near the outer upper end of the arms 10, 10 of the sample container 11 have the same size. Attached to the tip freely.

Next, a series of operations and operations of the above apparatus will be described. As shown in FIG. 1, the support frame 2 is raised to keep the mounting plate 9 and the sample container 11 in close contact with each other, and the container 11
The amount of fresh concrete (freshly mixed) a actually collected from the construction site is sampled in advance, and this is sampled for one measurement, and this amount is approximately 1/3 of the total storage amount.
The sample is divided into three times, and each time, the objects are struck 25 times with a stick and stored within 3 minutes, and the sample is prepared to have a constant density. Next, the cylinder 4 is operated to move the two cross rods 3,3.
When the support frame 2 is lowered by 300 (m / m) over 2-3 seconds by lowering the intersection 6 of the mounting plate 9, the mounting plate 9 is separated from the lower end of the sample container 11 as shown in FIG. The ready-mixed concrete a that has been confined in the sample container 11 by the is released from the container 11. At that time, due to the fluidity, container 1
Since the hem portion spreads and collapses naturally without retaining the shape within 1, the height of the apex of the sample at this time is measured by a scale. In this way, the fluidity of the sample is dominated by the roughness of the aggregate of the fresh concrete, the water content and the auxiliary agent added to enhance the fluidity, so the height of the apex of the concrete differs from sample to sample. Therefore, it is possible to easily and accurately determine the fluidity of green concrete by confirming whether or not the height is maintained above a certain value. Although the lifting mechanism 13 in the above-described example uses a cylinder, it is not limited to this, and may be a worm gear or any other type, or may be an electric or fluid mechanism such as air or oil. It goes without saying that it is good.

[0008]

As described above, according to the present invention, the horizontal mounting plate for closing the bottom of the fixedly supported sample container is vertically lowered at a constant speed by the elevating mechanism. There is no risk of the sample container vibrating or tilting due to the impact when the concrete in the sample container flows down by lowering the concrete, and the concrete flows down stably on the horizontal mounting plate. Therefore, unlike the case where the sample container is raised manually or by a machine, there is no influence by the impact when the concrete is made to flow down. Moreover, since the horizontal mounting plate is configured to be supported by a pair of crossing rods that intersect in an X-shape, and the intersecting portion of the two is moved up and down by the elevating mechanism, the horizontal mounting plate has a structure for raising and lowering. Stable ascends and descends horizontally without applying force. As a result, the concrete can be promoted to collapse in the most natural state on the horizontal mounting plate, and the fluidity of the concrete can be stably and accurately measured.

[Brief description of drawings]

FIG. 1 is a schematic side view of the device of the present invention.

FIG. 2 is a schematic side view showing a usage state of the same as above.

FIG. 3 is a plan view of FIG.

FIG. 4 is a schematic side view showing a conventional example of using a sample container.

FIG. 5 is a plan view of the same.

[Explanation of symbols]

 1 pedestal 7 vertical guide rod 8 post 9 mounting plate 11 sample container 13 lifting mechanism

Claims (1)

[Scope of utility model registration request] 1. A pair of left and right vertical guide rods erected on a pedestal, a horizontal mounting plate supported by each vertical guide rod so as to be vertically movable in a horizontal state, and respective upper ends of the horizontal mounting plates. It is supported so that it can slide in the horizontal direction on the deck, and the lower end of each is supported by the base so that it can slide in the horizontal direction, and intersects in an X shape. A pair of connected crossing rods, an elevating mechanism for vertically moving the intersections of the crossing rods, and a lower end of the horizontal mounting plate that is in close contact with the horizontal mounting plate when the horizontal mounting plate is above the horizontal mounting plate. Is fixedly supported,
A slump test device for concrete, comprising: a truncated cone-shaped sample container having an open upper end surface and a lower end surface.