JPS5829451B2 - Method and device for collecting mortar in concrete - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for collecting mortar in concrete and an apparatus thereof, and in particular, mortar sieved from concrete is dropped into a collecting container, and the collecting container is vibrated to tightly mix the mortar contained therein. The mortar in the concrete can be collected within a short time and very easily and weighed at the same time by scraping off the excess mortar that has risen at the mouth edge of the collection container.

Mortar collection from concrete is used as a sampling method to detect the unit amount of cement in concrete, but conventional mortar collection requires a considerable amount of time even just for the collection process, and it requires additional mortar to be collected after collection. It took a lot of time to weigh it.

Therefore, work such as detecting the unit amount of cement is one of the causes of stagnation in concrete pouring work.

Therefore, the present invention aims to eliminate such drawbacks of the conventional technology, and its purpose is to collect mortar in concrete in a short time, and its purpose is to simultaneously perform weighing of mortar at the same time. Moreover, its purpose is to ensure the accuracy of weighing.

That is, this application collects concrete, sieves it with a sieve 2 connected to a vibrator 1, and places the mortar in a collection container 3 with a certain capacity to the extent that excess mortar rises from the edge of the container 30. Dropping, from the time of this dropping at the latest, or after dropping, the collection container 3 is vibrated by the vibrator 1 to make the mortar in the collection container 3 dense, and then rises from the edge of the collection container 30. A method for collecting mortar in concrete, which is characterized by scraping off excess mortar, is defined as a specified invention, and a vibrator 1 is provided as a device directly used for carrying out the specified invention, and the entire structure is configured to vibrate. At the same time as constructing @2 on the upper part of the machine frame 4, a mortar guide member 5 such as a hopper or a chute is provided below the platform 2, and at the lower end of the mortar guide member 5, a pedestal 6 that is integral with the machine frame 4 is installed. Collection container 3 placed on
To provide a device for collecting mortar in concrete, which is characterized in that

Next, this invention will be explained according to the drawings.

FIG. 1 shows an embodiment of the mortar extraction device in concrete according to the present invention, in which a sieve 2 is installed on the upper part of the machine frame 4, and a hopper-shaped mortar guide material 5 is installed below the sieve 2. A pedestal 6 is fixed to a support member 7 at the lower part of the machine frame 4, and a collection container 3 of a predetermined capacity is placed in the recessed portion of the upper surface of the pedestal 6.

At this time, the upper opening of the collection container 3 faces the lower end of the mortar guide member 5, and is configured to receive mortar from the lower end.

Further, a frame 8 is fixed around the upper surface of @2, so that the sieved coarse aggregate and the mortar before sieving are not scattered elsewhere.

A vibrator 1 is fixed to the machine frame 4 so that these components vibrate together.

Although an electric vibrator is used as the vibrator 1 here, other types of vibrators may be used as long as they vibrate the entire body mechanically as described above.

Further, the sieve 2 is preferably a sieve made of a wire mesh with an opening of about 5 mm.

Furthermore, although the pedestal 6 has a concave portion formed on its upper surface here,
It must be able to transmit vibrations to the collection container 3 while the pedestal 6 is vibrating, and the collection container 3 must be detachable.

A single vibrator 1 in this embodiment vibrates @2 and the collection container 3 at the same time.

Therefore, when the sieve 2 starts to sieve the mortar from the concrete, the collection container 3 also starts vibrating before it is filled with mortar.

The collection container 3 has a capacity of 1f5rll, and has a certain degree of impact resistance, acid resistance, and alkali resistance.

As a material that satisfies these conditions, is suitable for mass production, and is inexpensive, styrene resin, etc. are suitable.

Then, concrete is taken from a truck mixer or the like and fed onto the sieve 2.

At the time of this supply, it is desirable that the vibrator 1 is started in advance.

The mortar sieved from the concrete passes through a mortar guide 5 and falls into a collection container 3.

Mortar is poured into the collection container 3 to the extent that excess mortar rises from the upper rim.

According to the apparatus shown in FIG. 1, since the collection container 3 is already vibrating, the mortar in the collection container 3 is densely filled by this vibration.

Therefore, there are no bubbles or voids inside.

Note that, instead of vibrating the sieve 2 and the collection container 3 with one vibrator 1 as in the apparatus shown in FIG. 1, they may be vibrated with separate vibrators.

In that case, the vibration timings of @2 and collection container 3 can be selected separately.

The vibration of the collection container 3 may be suitably started from the start of mortar sieving, halfway through the sieving, or after the mortar has been poured into the collection container 3.

Further, if a method of vibrating each using a separate vibrator is adopted, it is not necessarily necessary to incorporate the @2 and the collection container 3 into the same machine frame 4.

When the collection container 3 is densely filled with mortar due to the vibration, the collection container 3 is taken out from the pedestal 6, and the excess mortar that has risen up is scraped off from its upper rim.

A tool having a shape like a bailing knife for art materials or a palette knife is suitable for this suri-kiri, but a wide variety of other tools can be used as long as it is capable of suri-kiri.

A spoon 9 suitable for taking the concrete is shown in FIG. 2, and a veining knife 10 suitable for cutting the concrete is shown in FIG.

Although mortar collection is completed by this cutting, according to this method, mortar can also be weighed at the same time as collection.

Furthermore, as shown in FIG. 4, it is suitable for weighing mortar if a rubber camp 11 is attached to the outside of the upper part of the collection container 3.

This prevents mortar from adhering to the outside of the collection container 3 when the mortar that has been sieved by the vibrating sieve 2 is dropped into the collection container 3 and when the mortar overflows from the collection container 3. It is.

As a result, the mortar flows down to the outside of the rubber cap 11 and does not adhere to the outside of the collection container 3.

After scraping off the mortar that has overflowed and built up in collection container 3 with a veining knife 10, etc., remove the rubber cap 11.
All you have to do is remove it from the collection container 3.

Therefore, the effort and time required to wipe off mortar adhering to the outer periphery of the collection container 3 can be omitted, and the accuracy of the amount of mortar thrown into the detection container, which will be described later, can be ensured.

Next, a method for subjecting mortar sampled according to the present invention to a test for detecting the amount of cement contained per unit will be described.

The mortar collected as described above is placed together with the collection container 3 into a polyethylene resin container having a capacity of 500 TrLl.

In the container, 300ml of a 2N solution of hydrochloric acid as an inorganic acid was added.
Then, 7.5 ml of 2% phenolphthalein solution as an indicator for neutralization titration is added in advance, together with the mortar, or after the mortar.

This is then shaken for 1 minute to dissolve the cement in the mortar in the inorganic acid.

※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※
Using a standard solution, determine the neutralization titer of the cement solution.

By this back calculation method, the relationship between the amount of cement in the mortar and the amount of 4N sodium hydroxide can be determined as shown in Table 1.

The relationship between the amount of cement in the mortar and the neutralization titer of 4N sodium hydroxide is shown in a graph as shown in FIG.

Using this calibration line, the amount of cement in the mortar can be easily determined from the neutralization titer in subsequent tests.

If the relational expression between the amount of cement in the mortar and the neutralization titer of 4N sodium hydroxide is estimated with a reliability of 95%, the error will be determined by the following equation.

However, y: Amount of cement in mortar (kg/m”) x:
4N NaOH neutralization titer (mA') *Using this to calculate the estimation error for the amount of cement in mortar with a confidence level of 95%, within the range of concrete mixtures in Table 2, it is ±3
．． It becomes 9%.

Since the error treated here is a combination of errors from both mortar sampling and neutralization titration, it is thought that the error due to mortar sampling itself is even smaller than the above value.

Since the cement amount detection test method described above is an example of how the present invention is utilized, it goes without saying that the present invention can be used in other methods as well.

As is clear from the above, according to the present invention, the mortar collection time can be extremely shortened.

When mortar was collected as described above using the apparatus shown in FIG. 1, it was found that the mortar could be collected within one minute.

Further, according to the present invention, since mortar can be weighed at the same time as being taken, there is no particular need for time for weighing.

Furthermore, according to the present invention, since the entire collection container can be subjected to tests, etc., it has the effect of ensuring accuracy in the amount of mortar collected, and mortar collection becomes extremely easy, so it is suitable for mortar collection at concrete pouring sites. be.

[Brief explanation of the drawing]

Figure 1 is a front view of the device used to collect mortar from concrete, Figure 2 is a front view of the spoon used to collect concrete, Figure 3 is a painting knife that cuts through the mortar, and Figure 4 is a rubber gap in the collection container. FIG. 5 is a graph showing the relationship between the amount of cement in the mortar and the neutralization titer of 4N sodium hydroxide using a calibration line. In the figure, 1 is a vibrator, 2 is a sieve, 3 is a collection container, 4 is a machine frame, 5 is a mortar guide, and 6 is a pedestal.

Claims (1)

[Claims] 1. Collect concrete, sieve it using a sieve connected to a vibrator, and drop the mortar into a collection container with a certain capacity to the extent that excess mortar rises from the rim of the container. From the time of dropping, at the latest, or after dropping, the collection container is vibrated with a vibrator to make the mortar in the collection container dense, and after that, the excess mortar that has risen from the rim of the collection container is rubbed off. A method for collecting mortar in concrete, which is characterized by cutting. 2. A sieve is installed on the top of a machine frame that is equipped with a vibrator and configured to vibrate as a whole, and a mortar guide such as a hopper or chute is installed below the platform, and the machine frame is installed at the lower end of the mortar guide. A device for collecting mortar in concrete, characterized in that a collecting container placed on a pedestal integral with a frame faces out.