JPH0669816U - Concrete slump test equipment - Google Patents

Abstract

(57) [Summary] [Purpose] The reliability of measurement is improved by opening the mounting plate that closes the bottom of the sample container at a constant speed and preventing the mounting plate from swinging left and right. [Structure] A mounting plate 9 which is located below a sample container 11 which is vertically held and fixed and which closes the bottom of the sample container 11 is vertically moved at a constant speed by an elevating mechanism 13.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention is a concrete in which uncured raw concrete (freshly mixed) sample is stored in a predetermined container (JIS standard product), and then the fluidity of the concrete is tested when the sample container is gently removed. The present invention relates to a slump test device.

[0002]

[Prior art]

 The slump test of concrete is stipulated by JIS (Japanese Industrial Standard), and the bottomless sample container 11 for sampling concrete has a height of 300 (m / m), an upper bottom and a lower bottom as shown in FIGS. The inner diameter of each is 100 (m / m) and 200 (m / m), respectively, and it has a conical shape. Handles 12 and 12 are provided on both sides near the top, and the sample container 11 is placed on a horizontal flat plate 9. Then, the freshly-mixed fresh concrete sampled in the container 11 is poured from the upper end opening, divided into three times, and crushed a predetermined number of times with a stick to accommodate a fixed amount. Next, when the storage of the sample is completed, the container 11 is pulled up from the flat plate 9 at a slow speed with the handles 12 and 12, so that the raw concrete in the container 11 has a chevron shape on the flat plate 9. At this time, the height of the sample apex from the flat plate 9 is measured to determine the fluidity of the concrete.

[0003]

[Problems to be solved by the device]

 However, in the above-mentioned conventional example, when the sample container was removed from the flat plate, it was done manually. In other words, since the sample container is pulled up by the handle, there are individual differences in the pulling speed, and it is easy for the hand shake to the left and right to add extra motion to the concrete, causing it to collapse. 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 that maintains constant measurement conditions regardless of the measurer.

[0004]

[Means for Solving the Problems] A horizontal mounting plate supported by a lifting mechanism so as to be capable of moving up and down, and a lower end of the horizontal mounting plate that is placed above the mounting plate and is raised when the mounting plate is raised. It consists of a sample container that is closed.

[0005]

[Action]

 After raising the horizontal mounting plate to make it closely 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 at a predetermined height. By descending to this point, the mounting plate and the sample container are completely separated, and the height of the fresh concrete on the mounting plate that has collapsed at that time is measured to determine the fluidity of the concrete.

[0006]

【Example】

 Hereinafter, the present invention will be described in detail with reference to the embodiments shown in the drawings. As shown in FIGS. 1 to 3, the horizontal sample mounting plate 9 is supported on vertical guide rods 7 and 7 standing on both ends of the base 1. The frame 2 is supported to move up and down, and the upper and lower ends of the pair of crossing rods 3 and 3 are slid between the support frame 2 and the guide rods 1'and 2'disposed on the pedestal 1. And a connecting point 6 of the crossing rods 3, 3 is connected to an upper end of a piston rod 5 of a cylinder 4 (which may be a lift rod driving device using a rack rod and a pinion) fixed at the center of the pedestal. On the upper ends of the columns 8 standing upright on both ends of the pedestal 1, there is provided a bottomless sample container 11 having a truncated cone shape at the tip via arms 10 projecting horizontally opposed from the columns, and a truncated cone. Place with the center line of the top and bottom up and down. As described in the above-mentioned 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 arm 10 and 10 are provided. 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 supporting frame 2 is raised to keep the mounting plate 9 and the sample container 11 in close contact with each other. A sufficient amount to measure the fresh concrete (freshly mixed) a actually collected from the construction site was sampled in advance, and this was divided into 3 times for approximately 1/3 of the total storage amount for one measurement. Separately, squeeze the sample 25 times with a stick and store it within 3 minutes, and prepare the sample so that the density is constant. Next, the cylinder 4 is operated to lower the intersection 6 of the two crossing rods 3, 3 to lower the support frame 2 over 300 seconds (m / m) over a period of 2 to 3 seconds. The raw concrete a, which is separated from the lower end of the sample container 11 as described above and is confined in the sample container 11 by the mounting plate 9, is released from the container 11. At that time, due to the fluidity, the shape in the container 11 is not stopped and the skirt expands and collapses naturally. Therefore, the height of the top 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 and the auxiliary agents added to increase the water content and fluidity, so the height of the apex of the concrete is different for each sampling. Since the values are different, it is possible to easily and accurately determine the fluidity of green concrete by confirming whether or not the height above a certain value is maintained. 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 device, and may be an electric motor or a fluid mechanism such as air or oil. It goes without saying that it is also good.

[0008]

[Effect of device]

 As described above, in the present invention, the mounting plate that closes the bottom of the sample container can be vertically lowered at a constant speed by the elevating mechanism. Since it does not swing to the left or right, it is not affected by the fluctuations in speed or left and right shake that occur when human hands are used so far, and it can promote a collapse in the most natural state, significantly improving reliability.

[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 above.

[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 horizontal mounting plate is vertically movably supported by a vertically moving mechanism on left and right vertical guide rods which are erected on a pedestal, and at the upper end portion of a column erected on the pedestal, the horizontal A concrete slump test device in which a truncated cone-shaped sample container whose lower end is in close contact with the mounting plate is attached detachably when the mounting plate is on the upper side.