JP3100370U - Mortar mixing equipment and mortar spraying equipment - Google Patents

Abstract

To provide a mortar mixing device and a mortar spraying device that can suppress the occurrence of rebound, enable high-quality and high-strength mortar to be cast, and can further reduce costs.
A mortar mixing apparatus for mixing aggregate 1 and cement milk 6 constituting mortar M, wherein the cement milk 6 is supplied to a substantially tubular aggregate hose 10 through which the aggregate 1 flows. The downstream end of the cement milk delivery pipe 9 flowing inside is connected, and the aggregate 1 is dispersed at a position where the cement milk 6 is introduced into the aggregate hose 10.
[Selection diagram] Fig. 1

Description

(4) The present invention relates to a mortar (in the present invention, concrete containing crushed stone as an aggregate) mixing apparatus and a mortar spraying apparatus.

JP 2001-248164 A

The present applicant, when spraying mortar on a formwork previously formed on a high slope to form a grid-like formwork, uses conventional water, cement, and sand as aggregate. We are developing a separate pumping method that separately pumps the cement milk and aggregates that make up the mortar in order to perform spraying at high altitudes more efficiently compared to the mortar spraying method that mixes in advance. (See Patent Document 1).

In the separate pressure feeding method, for example, sand as an aggregate is moved by a compressed air through a connecting hose having a length of about 400 m, and mixed with cement milk immediately before the spray nozzle to about 10 m before the spray nozzle. A mortar is obtained, and a worker supported by a lifeline blows the mortar onto the mold while holding the spray nozzle, thereby forming a grid-like normal frame.

However, in the separate mortar spraying method described above, since the cement milk and the sand sometimes do not mix evenly and uniformly, the sand that is not covered by the cement milk rebounds on the slope when the mortar is sprayed (rebound). ) 、 Bounced sand sometimes accumulated on the slope. In such a case, the spraying operation was suspended, and the air from the spray nozzle was sprayed on the slope to remove the accumulated sand. In some cases, it was necessary to perform an operation of removing from the slope. In addition, it is necessary to prepare a large amount of sand in advance in consideration of the loss of sand due to rebound, which may lead to an increase in cost.

Further, as described above, since the cement milk and the sand may not be evenly and uniformly mixed, a mortar having a predetermined composition may not be formed, or the quality of the mortar is reduced, and the compressive strength is large. There was a possibility that high strength mortar could not be applied.

This invention has been made in consideration of the above-mentioned matters, and its purpose is to suppress the occurrence of rebound, to enable the casting of high-quality and high-strength mortar, and to further reduce the cost. It is to provide a mixing device as well as a mortar spraying device.

In order to achieve the above object, a mortar mixing device of the present invention is a mortar mixing device for mixing aggregate and cement milk constituting mortar, wherein the aggregate is placed in a substantially tubular aggregate flow path. While flowing, the cement milk flows into a cement milk delivery pipe having a downstream end connected to the aggregate flow path, and a position where the aggregate is dispersed in the aggregate flow path, from the cement milk delivery pipe. It was configured to introduce cement milk (claim 1).

Further, a jump surface portion for dispersing the aggregate is provided in the aggregate channel, and the jump surface portion is formed so as to be higher toward the downstream side on the inner wall of the aggregate channel. Is preferable (claim 2).

Preferably, the aggregate flow path has a large-diameter portion, and the jump surface portion is provided downstream of the large-diameter portion (claim 3).

In addition, a projection for dispersing the aggregate may be provided in the aggregate channel (claim 4).

In addition, a cylindrical member provided with a slit over substantially the entire circumference is disposed at a connection portion of the aggregate channel in which the downstream end of the cement milk delivery pipe is connected, and the cement milk in the cement milk delivery pipe is subjected to the slit. It may be configured to be introduced into the aggregate flow path from the above (claim 5).

The mortar spraying device according to the present invention is a mortar spraying device that separately blows the aggregate and cement milk constituting the mortar and then mixes and blows the mortar, wherein the mixing is performed. The mortar mixing device described in (1) is used (claim 6).

According to the present invention having the above-described configuration, a mortar mixing device and a mortar spraying device that can suppress the occurrence of rebound, enable high-quality and high-strength mortar to be cast, and can further reduce costs. Can be provided.

That is, by introducing the cement milk into the aggregate in a dispersed state, the cement milk and the aggregate can be uniformly mixed evenly. Aggregates that are not bounced off the slope (rebound), and the bounced aggregates accumulate on the slope, so the spraying operation was temporarily suspended and the air from the spray nozzle was sprayed on the slope to accumulate. The need to remove the aggregate from the slope is reduced, and the mortar spraying operation can be performed efficiently and easily. Further, unlike the related art, there is almost no need to prepare a large amount of sand in advance in consideration of the loss of the aggregate due to the rebound, and the cost can be reduced.

Furthermore, since cement milk and aggregate can be evenly and uniformly mixed, a mortar of a prescribed composition can be formed, the quality of the mortar can be improved, and the high-strength mortar with a large compressive strength can be reliably installed. Becomes possible.

Also, unlike conventional spraying with a gun machine, cement milk and aggregate can be instantaneously and evenly mixed without the need for long-term stirring of the material by a mixer. It is also possible to shorten the time required for the attaching work. Further, in the conventional method of mixing materials using a mixer of a gun machine, there is a case where the material is re-separated in the transfer pipe, particularly when a long distance transfer of more than 100 m is performed. Can also be solved.

Further, when the jump surface portion is formed on the downstream side of the large diameter portion, the flow path area of the portion where the jump surface portion is provided in the aggregate flow path is prevented from being reduced, and the smooth flow of the aggregate is prevented. Distribution will be secured.

Further, when the projections are provided and the aggregates flowing in the aggregate channel are dispersed by using the projections, the dispersion can be performed reliably and at low cost with a simple configuration. It becomes possible.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is an explanatory view schematically showing a configuration of a mortar spraying device (hereinafter, referred to as a spraying device) A having a mortar mixing device (hereinafter, referred to as a mixing device) D according to an embodiment of the present invention.
The spraying device A includes an aggregate feeder 2 as an aggregate supply means for supplying an aggregate (sand (fine aggregate) in the case of mortar M, sand and crushed stone (coarse aggregate) in the case of concrete). And an air compressor 3 connected to the aggregate pumping machine 2, and a pump for pumping cement (a piston pump, squeeze, etc.) as cement milk sending means for sending cement milk 6 obtained by mixing cement 4 and water 5. Pump 7, a supply pipe 8 connected to the downstream side of the aggregate pumping machine 2, and an upstream end connected to the downstream side of the pump 7 for pumping, and a downstream portion of the supply pipe 8, preferably Immediately before a discharge unit 27 described below, a cement milk delivery pipe 9 having a downstream end connected via the mixing device D is provided.

The spraying apparatus A is of a separate pumping type in which the aggregate 1 and the cement milk 6 are separately pumped, and the two are mixed just before spraying from the downstream portion of the supply pipe 8. .

The aggregate feeder 2 discharges the aggregate 1 to the downstream side together with the high-pressure air (compressed air) supplied from the air compressor 3. The discharged aggregate 1 is connected to the supply pipe. 8, and is sent to the downstream side of the supply pipe 8 by the high-pressure air.

The supply pipe 8 includes, for example, a connecting hose section 10 that connects a plurality of flexible hoses of about 20 m, and the mixing device D provided downstream of the connecting hose section 10. I have. As the supply pipe 8, for example, a normal mortar spraying hose can be used.

The cement milk delivery pipe 9 is formed such that its inner diameter is, for example, about 1 to 3 cm.

連結 The connection hose section 10 is configured to have a length of, for example, about 400 m at a maximum.

FIG. 2 is an explanatory diagram schematically showing the configuration of the mixing device D.
The mixing device D is for mixing the cement milk 6 flowing in the cement milk delivery pipe 9 with the aggregate 1 flowing in the supply pipe 8 and includes a substantially tubular aggregate flow path 11. And an introduction means 12 for introducing the cement milk 6 from the cement milk delivery pipe 9 into the aggregate flow path 11.

The aggregate flow path 11 includes, in order from the upstream side, a large-diameter portion 13 formed to have a diameter larger than the diameter of another portion (the connection hose portion 10) of the supply pipe 8; A jump surface portion 14 is provided continuously on the downstream side of the portion 13 and is formed to be higher toward the downstream side.

The introduction means 12 includes a connection part 15 to which the cement milk delivery pipe 9 is connected from the side, a communication part 16 communicating with the cement milk delivery pipe 9, an outer connection part 16 and the inner bone. It has an annular slit 17 which communicates with the material flow path 11 and is inclined so that the inner side is located on the downstream side.

More specifically, the mixing device D includes an upstream connecting portion 18 and a cylindrical portion which is held by the upstream connecting portion 18 in a state where the upstream end of the connecting hose portion 10 is in contact with the downstream end of the connecting hose portion 10 on the upstream side. 19, a downstream end of the cylindrical portion 19, and a downstream portion for connecting the introducing portion 20 having the introducing means 12 to the introducing portion 20 and the connecting hose portion 10 on the downstream side of the introducing portion 20. And a side connection portion 21.

The upstream connection portion 18 has a small-diameter through hole 18a into which the upstream connection hose portion 10 is inserted, and a female screw portion 18b to which a male screw portion 19a provided on the upstream side of the cylindrical portion 19 is screwed. Have.

The cylindrical portion 19 has a male screw portion 19a and a male screw portion 19b on the upstream side and the downstream side of the outer peripheral surface, respectively. The diameters of the upstream and downstream openings 19c and 19d of the cylindrical portion 19 are The connection hose 10 is formed so as to have substantially the same diameter as the connecting hose portion 10 on the upstream side.

Further, on the inner wall of the cylindrical portion 19, in order from the upstream side, a tapered surface 22 whose diameter increases toward the downstream side, the large-diameter portion 13 whose diameter from the upstream end to the downstream end is substantially constant, The jump surface portion 14 which is formed in an annular shape as a tapered surface having a smaller inner diameter is provided. That is, the upstream and downstream sides of the tubular portion 19 have a symmetrical structure. The jump surface portion 14 is formed such that the difference in height is, for example, 5 to 10 mm. Further, in order to prevent abrasion due to the aggregate, it is desirable that at least the large diameter portion 13 and the jump surface portion 14 be lined with an elastic material such as rubber.

The introduction portion 20 is substantially cylindrical, and has an outer cylindrical member 24 having a small diameter portion 23 having a small inner diameter in the center, and also has a substantially cylindrical shape, and is in contact with the inside of the small diameter portion 23 of the outer cylindrical member 24. And an inner cylinder member 25 arranged in a state.

The outer cylinder member 24 has, on the upstream side, a female screw part 24a that is screwed with the male screw part 19b on the downstream side of the cylinder part 19, and the male screw part 21b provided on the upstream side of the downstream connection part 21 is screwed. A mating female screw portion 24b is provided on the downstream side. As shown in FIG. 3, the connecting portion 15 connected to the small diameter portion 23 of the outer cylinder member 24 in a state where the downstream end of the cement milk delivery pipe 9 is inserted from the outside, The connecting portion 16 which is an annular groove is provided. The tubular portion 19, the outer tubular member 24, and the inner tubular member 25 are made of, for example, a metal such as aluminum.

4A, 4B, and 4C are a side view, a longitudinal sectional view, and a transverse sectional view schematically showing the configuration of the inner cylinder member 25.
The inner cylindrical member 25 has a substantially cylindrical member provided with the slits 17 (width 3 to 10 mm, preferably 5 to 7 mm) over substantially the entire circumference thereof. 25c is connected by a plurality of (four in the present embodiment) bridges 25b, 25b,....

The diameter of the opening 25c on the upstream side of the inner cylindrical member 25 is formed to be substantially the same as the diameter of the opening 19d on the downstream side of the cylindrical portion 19, and the diameter of the opening 25d on the downstream side is The connecting hose portion 10 is formed so as to have substantially the same diameter as the connecting hose portion 10 on the side.

The downstream connection portion 21 has a small-diameter through hole 21a into which the downstream connection hose portion 10 is inserted, and a male screw portion 21b screwed with a female screw portion 24b provided on the upstream side of the cylindrical portion 19. Have.

供給 Further, the supply pipe 8 has a discharge portion 27 for discharging the cement milk 6 and the aggregate 1 mixed in the mixing device D, on the downstream side of the mixing device D.

In the mixing device D, the mortar M is formed by mixing the cement milk 6 and the aggregate 1, and the mortar M includes cement 4, aggregate (sand) 1, and water 5 as appropriate. It is desirable to use an admixture, for example, having a weight ratio of cement 4: aggregate (sand) 1: water 5 = 1: 4: 0.45 to 0.6. In the case of concrete, a part of the sand is appropriately replaced with crushed stone.

Next, a method of placing mortar performed using the spraying apparatus A having the above-described configuration will be described.
The method of placing the mortar can be performed by driving the aggregate feeder 2 and the air compressor 3 and the pump 7 for pumping, and moving the discharge portion 27 of the supply pipe 8 to an appropriate position. .

That is, by driving the aggregate feeder 2 and the air compressor 3, the aggregate 1 is sent into the supply pipe 8 together with the high-pressure air, and reaches the mixing device D.

On the other hand, by driving the pump for pumping 7, the cement milk 6 is sent into the cement milk delivery pipe 9 and reaches the mixing device D.

5A and 5B are an explanatory view and a longitudinal sectional view schematically showing the operation of the mixing device D.
The aggregate 1 that has reached the mixing device D through the supply pipe 8 travels further downstream via the large-diameter portion 13 and the jump surface portion 14 in the aggregate flow path 11. When there is an aggregate 1 flowing along the bottom of the material flow path 11 (supply pipe 8), the aggregate 1 collides with the jump surface 14 when passing through the jump surface 14 and becomes oblique. As a result, the aggregate 1 that has been hardened and dispersed is dispersed.

On the other hand, the cement milk 6 that has reached the mixing device D through the cement milk delivery pipe 9 passes through the connecting portion 15 and the connecting portion 16 as shown in FIG. It is introduced into the aggregate channel 11 from the slit 17 formed over almost the entire circumference of the inner wall of the channel 11.

Then, the cement milk 6 from the cement milk delivery pipe 9 is introduced into the aggregate channel 11 at a position where the aggregate 1 is dispersed. The grains are firmly coated with the cement milk 6, and the aggregate 1 and the cement milk 6 are evenly and uniformly mixed.

As described above, in the mixing device D, the cement milk 6 and the aggregate 1 are mixed at an appropriate ratio, whereby the mortar M is formed, and the formed mortar M is downstream of the mixing device D. The mortar is discharged to the side of the mortar from the discharge section 27 (that is, downstream of the supply pipe 8).

In the above embodiment, the jump surface 14 is formed integrally with the inside of the tubular portion 19. However, the present invention is not limited to such a configuration. For example, an annular member having the jump surface 14 May be provided separately from the tubular portion 19, and this may be disposed inside the tubular portion 19.

Further, in the above embodiment, the cement milk 6 from the cement milk delivery pipe 9 is introduced into the aggregate channel 11 from the slit 17, but the present invention is not limited to such a configuration. For example, a plurality of nozzles (not shown) may be provided instead of or in addition to the slit 17, and the cement milk 6 may be introduced from each nozzle. Further, in any case, the slit 17 (or nozzle) is narrowed so that the cement milk 6 is not dull, so that the flow rate of the cement milk 6 introduced into the aggregate channel 11 is increased. The milk 6 may be injected into the aggregate channel 11.

As a means for dispersing the aggregate 1, a projection 26 may be provided as shown in FIGS. 6A and 6B instead of or in addition to the jump surface portion 14. The protrusions 26 have, for example, a substantially hemispherical shape. Are located. Further, a plurality of rows (for example, two rows) of the protrusions 26 arranged in the circumferential direction may be provided at appropriate intervals in the flow direction of the aggregate channel 11 (the axial direction of the cylindrical portion 19), In this case, it is preferable that the projections 26 in the adjacent rows are arranged at positions shifted from each other in the circumferential direction. The shape of the projection 26 is not limited to a hemispherical shape, but it is difficult to receive resistance from the transported aggregate 1 to prevent clogging in the flow path (aggregate flow path 11). It can be desirable.

Also, as shown in FIG. 6A, when the projection 26 is provided, the large diameter portion 13 does not need to be provided. It will have a constant inner diameter. The configuration in which the large diameter portion 13 is not provided may be adopted when the jump surface portion 14 is provided instead of the protrusion 26.

FIG. 3 is an explanatory view schematically showing a configuration of a mortar spraying device having a mortar mixing device according to an embodiment of the present invention. It is an explanatory view showing roughly composition of a mortar mixing device in the above-mentioned example. FIG. 3 is a sectional view taken along line XX of FIG. 2. (A), (B) and (C) are a side view, a longitudinal sectional view and a transverse sectional view schematically showing the configuration of the inner cylinder member in the above embodiment. (A) and (B) are an explanatory view and a longitudinal sectional view schematically showing the operation of the mortar mixing device. (A) and (B) are an explanatory view and a longitudinal sectional view schematically showing a configuration of a modified example of the mortar mixing device.

Explanation of reference numerals

DESCRIPTION OF SYMBOLS 1 Aggregate 6 Cement milk 9 Cement milk delivery pipe 11 Aggregate flow path A Spray device D Mortar mixing device M Mortar

Claims (6)

A mortar mixing device for mixing aggregate and cement milk constituting a mortar, wherein the aggregate flows into a substantially tubular aggregate flow path, and the cement milk flows through the aggregate flow path at a downstream end. Mortar mixing, wherein the mortar mixing is configured to flow into a cement milk delivery pipe connected to the cement milk and to introduce cement milk from the cement milk delivery pipe to a position where the aggregate is dispersed in the aggregate flow path. apparatus. A jump surface portion for dispersing the aggregate is provided in the aggregate flow channel, and the jump surface portion is formed so as to be higher on the inner wall of the aggregate flow channel toward the downstream side. 3. The mortar mixing device according to 2. The mortar mixer according to claim 2, wherein the aggregate flow path has a large-diameter portion, and the jump surface portion is provided downstream of the large-diameter portion. The mortar mixing device according to any one of claims 1 to 3, wherein a projection for dispersing the aggregate is provided in the aggregate channel. At a connection portion of the aggregate flow path where the downstream end of the cement milk delivery pipe is connected, a cylindrical member provided with a slit over substantially the entire circumference is arranged, and cement milk in the cement milk delivery pipe is boned from the slit. The mortar mixing device according to any one of claims 1 to 4, wherein the mortar mixing device is introduced into the material flow path. It is a mortar spraying device that mixes and blows after separately feeding the aggregate and cement milk constituting the mortar, and uses the mortar mixing device according to any one of claims 1 to 5 to perform the mixing. Mortar spraying device.

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