JP2003301478A - Production device of lightweight earth mixed with air bubble - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a production device of lightweight earth mixed with bubbles capable of realizing a long distance force feed without using a plurality of pumps, controlling the flow rate of cement milk, lightweight earth raw material or the like in a constant rate and controlling generating volume of air bubble in accordance with the flow rate of the cement milk or the lightweight earth raw material or the like. <P>SOLUTION: The production device of lightweight earth is provided with a sealed type mixer body 85 capable of supplying mortar 3 and air bubbles to one side end and discharging lightweight earth 60 mixed with air bobbles from the other side end, an agitation section 88 which is disposed in the mixer body 85 to agitate the mortar 3 and the air bubbles in a low pressure or a negative pressure condition, propulsive blades 91 propelling these materials to the discharge side of the other end while agitating these materials, and a returning section 92 returning a part of these materials to one side end during agitation of the mortar 3 and the air bubbles. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for producing lightweight soil containing air bubbles.

[0002]

2. Description of the Related Art Mortar, cement milk, cement and water can be added to mortar, cement milk, and soil generated on site on steep slopes, sites where wide embankment with a normal slope cannot be constructed, or sites where earth pressure reduction is required. A so-called bubble-containing lightweight soil construction method is used in which bubbles are mixed into a mixed soil to which is added and placed as a bubble-containing lightweight soil.

The methods for producing the above-mentioned lightweight soil containing air bubbles are roughly classified into a mixed foam method and a preform method. In the mixed foam method, a foaming agent and water are rapidly stirred by a mixer to foam, and sand and cement are mixed with this to produce foamed lightweight soil. On the other hand, in the preform method, a foaming agent is used to foam a foaming agent solution in advance by using compressed air, and the foaming agent solution is mixed with a separately prepared cement milk or mortar to produce bubble-containing lightweight soil.

In the preform method, a continuous mixer is used to produce a large amount of aerated lightweight soil, and a batch mixer is used to produce a small amount of aerated lightweight soil. , Cement milk or mortar is mixed with air bubbles. Then, in order to mix the mortar and the bubbles with the fixed ratio, a pump capable of sending the mortar and the like at a constant flow rate,
A foaming device that foams bubbles at a constant flow rate is required.

Further, as a mixer for mixing air bubbles with cement milk or mortar, there are an atmospheric open type and a closed type.

[0006]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention In an open air type mixer, two pumps, a pump for sending cement milk or mortar to the mixer and a pump for sending lightweight soil containing bubbles from the mixer to the setting point, are provided. It is necessary for both the suction side and the discharge side of the mixer. On the other hand, in a closed mixer, it is possible to carry out pressure feeding in a short distance, but it is necessary to provide a mixer on the discharge side of the pressure feeding pump, and when the discharge pressure of the mixer becomes higher than the pressure for pumping bubbles, It was difficult to mix bubbles. In addition, a pump for pressure feeding is separately required to feed pressure over a long distance.

As described above, both the atmospheric open type mixer and the closed type mixer are placed on the discharge side of the pump to mix with the bubbles.

Further, when pumping cement milk or mortar, generally, the flow rate is set by changing the frequency wave number in the inverter power supply unit, but once the inverter power supply unit was set, it was fixed as it is.
The flow rate fluctuated under the influence of the viscosity of cement milk or mortar and the head pressure. As a result, the quality of the lightweight soil containing air bubbles fluctuated.

Therefore, the present invention solves the above problems, enables long-distance pumping without using a plurality of pumps, and makes it possible to control the flow rate of cement milk or mortar at a constant rate. It is intended to control the amount of bubbles generated according to the flow rate of cement milk or mortar.

[0010]

In order to solve the above-mentioned problems, in the invention described in claim 1, the lightweight soil material and the bubbles can be supplied to one end side and the bubble-containing lightweight soil is discharged from the other end side. A possible closed-type mixer main body, and a stirring unit that is disposed inside the mixer main body and that stirs the lightweight soil raw material and bubbles in a low pressure or negative pressure state, wherein the stirring unit is a lightweight soil raw material. Producing vanes that mix bubbles and bubbles while propelling them toward the discharge side at the other end, and a return part that returns a part of the lightweight soil raw material and bubbles to one end side during agitation It features a device.

According to the invention according to claim 1 having such a structure, when the lightweight soil raw material and the bubbles are supplied from one end side of the mixer main body and the stirring unit is driven, the stirring unit causes the lightweight soil raw material and the bubbles to flow. And are agitated under low pressure or negative pressure to produce a lightweight soil containing air bubbles. At this time, the propelling blades of the stirring unit stir the lightweight soil raw material and the air bubbles and propel them toward the discharge side. As a result, it becomes possible to give a propulsive force to the generated light-air mixed soil with bubbles. In addition, since the returning part of the stirring part returns a part thereof to one end side during the stirring of the lightweight soil raw material and the air bubbles, the local repeated stirring can be performed at any time. The effect of mixing bubbles can be improved.

[0012] In the invention described in claim 2, in the bubble mixing of claim 1, a reverse blade is attached to the discharge side of the other end of the main body of the mixer to prevent adhesion of bubble-containing lightweight soil to the shaft support portion. It features a lightweight soil manufacturing device.

According to the second aspect of the invention thus constructed, the reverse blade attached to the discharge side at the other end of the mixer body prevents the lightweight soil mixed with air bubbles from being fixed to the shaft bearing portion.

The invention as set forth in claim 3 is characterized by the apparatus for producing lightweight soil containing air bubbles according to claim 1 or 2, wherein the outlet of the mixer body can be connected to the suction side of an injection pump.

According to the third aspect of the present invention having such a configuration, by connecting the discharge port of the mixer main body to the suction side of the infusion pump, the infusion pump has a small specific gravity rather than the lightweight soil raw material itself. Since it is possible to pump the air-filled lightweight soil with excellent fluidity, it is possible to carry out long-distance pumping with a single injection pump, even when placing the air-filled lightweight soil on a large scale. The movement of equipment can be eliminated.

According to a fourth aspect of the present invention, the injection pump is controlled by sending a control signal to the inverter power supply unit of the injection pump to change the frequency based on the lightweight soil flow rate signal measured by the lightweight soil flow meter. The air-mixed lightweight soil according to claim 3, further comprising a control device for controlling the flow rate of the lightweight soil raw material to send a constant flow rate of the lightweight soil raw material to the mixer body regardless of the influence of the viscosity and the head pressure of the lightweight soil raw material. It features manufacturing equipment.

According to the present invention having the above-mentioned structure, the control device sends a control signal to the inverter power supply device of the injection pump based on the lightweight soil material flow rate signal measured by the lightweight soil material flow meter. Since the flow rate of the infusion pump is controlled by sending and changing the frequency, it is possible to send a constant flow rate of the lightweight soil material to the mixer body regardless of the influence of the viscosity of the lightweight soil material and the head pressure.

According to the invention described in claim 5, based on the lightweight soil material flow rate signal measured by the lightweight soil material flow meter, the automatic foaming apparatus is controlled by sending an interlocking signal to the automatic foaming apparatus for generating bubbles. According to another aspect of the present invention, there is provided a bubble-containing lightweight soil producing apparatus including a control device for sending an amount of bubbles according to a flow rate of the lightweight soil material to a mixer.

According to the fifth aspect of the present invention thus constructed, the control device sends the interlocking signal to the automatic foaming device for generating bubbles based on the lightweight soil material flow rate signal measured by the lightweight soil material flow meter. Since it controls the automatic foaming device by sending the bubbles, it is possible to send bubbles to the mixer in an amount corresponding to the flow rate of the lightweight soil raw material.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION Specific embodiments of the present invention will be described below with reference to the drawings.

1 to 7 show an embodiment of the present invention.

First, the structure will be described. As shown in FIG. 1, in the air-mixed lightweight soil producing apparatus 1, a lightweight soil raw material such as mortar 3 from a fresh concrete truck 2 is stored.
An agitator facility 4 for re-kneading is provided. The agitator equipment 4 includes a mortar storage tank 5 and a re-kneading device 6 for re-kneading the mortar 3 in the mortar storage tank 5, and the re-kneading device 6 is operated by a remote control panel 7 via a power supply device 8. The driving device 9 is driven to rotate the re-kneading blade 10. In addition to the mortar 3, the lightweight soil material includes cement milk, mixed soil obtained by adding cement and water to the soil generated at the site, and the like.

On the other hand, the above air bubble-containing lightweight soil producing apparatus 1
Is equipped with an automatic foaming device 15. The automatic foaming device 15 includes a dilution water flow meter 21, which is provided with a water intake 18 from a water tank 16, a strainer 19, and a flow rate indicator 20.
The check valve 22, the dilution water pump 23, and the static mixer 24 are used to feed the foamed cylinder 25. Further, the bubble agent tank 26 or the bubble agent 28 from the bubble agent tank 27 is fed into the bubble agent inlet 29, the switching valve 3
0, 31, a strainer 32, a foaming agent pump 33, a foaming agent flow meter 35 provided with a flow rate indicator 34, and a check valve 36 so that the dilution water pump 23 can be fed to the inlet side. . Further, the compressed air from the compressor 37 is passed through the compressed air intake 39, the dry filter 40, the pressure adjusting valve 41, the valves 42 and 43, the flow meter 44, the flow rate adjusting valve 45, and the check valve 46 to form the foam cylinder 2 therein.
It is configured so as to be able to deliver to the No. 5. Then, in the foaming cylinder 25, the bubbles generated from the water 17, the foaming agent 28, and the compressed air are provided with a plurality of bubble outlets 48, 4 equipped with a three-way valve 47.
It is constructed so that it can be taken out from any one of the nine. Here, reference numerals 50 and 51 are power supply devices for the dilution water pump 23 and the foaming agent pump 33.

Then, the mortar 3 from the agitator equipment 4 is replaced with a mortar flow meter 5 equipped with a flow rate indicator 55.
It is possible to supply to one end side of the mixer 58 through a mortar flow path 57 having a lightweight soil material flow meter such as 6.
In addition, the bubbles generated by the automatic foaming device 15 are passed through the bubble passage 59.
It is possible to supply to the one end side of the mixer 58 via.

The other end of the mixer 58 is connected to the suction side of the injection pump 54, and the discharge side of the injection pump 54 is filled with the bubble-containing lightweight soil 60 for sending the bubble-containing lightweight soil 60 to a setting point (not shown). The mounting flow path 61 is connected. A pressure gauge with a contact 62
A pressure gauge 63, a pressure gauge 63 and a flowmeter 64, and a recorder 65 capable of recording pressure and flow rate data relating to the amount of foamed lightweight soil 60 placed, a sample outlet 66 and an outlet valve 67. There is.

Further, in the air-mixed lightweight soil producing apparatus 1, the mortar flow rate signal 70 (light weight soil material flow rate signal) from the flow rate indicator 55 of the mortar flow meter 56 and the feed pressure detection signal from the contact pressure gauge 62. 71 is input to send control signals 74 and 75 to the inverter power supply device 72 of the mixer 58 and the inverter power supply device 73 of the injection pump 54, and a control device 77 that sends the interlocking signal 76 to the automatic foaming device 15. .

The control device 77 includes a mortar flow meter 56.
Mortar flow signal 7 showing the flow rate of mortar 3 measured in
Based on 0, the control signal 75 is sent to the inverter power supply device 73 to change the frequency to control the flow rate of the injection pump 54, and thus the constant flow rate is maintained regardless of the influence of the viscosity of the mortar 3 and the head pressure. Mortar 3 to mixer 5
It has a function to send to 8.

Further, the control device 77 controls the automatic foaming device 15 by sending an interlocking signal 76 to the automatic foaming device 15 based on the mortar flow signal 70 indicating the flow rate of the mortar 3 measured by the mortar flow meter 56. Thus, it has a function of sending bubbles to the mixer 58 in an amount corresponding to the flow rate of the mortar 3.

As shown in FIGS. 2 to 7, the mixer 58 according to this embodiment has a supply port 82 for supplying mortar 3 on one end side with respect to an upper portion of a substantially horizontal base 81.
And a substantially cylindrical closed-type mixer main body 85 which has a separate air supply port 83 and a discharge port 84 for the bubble-containing lightweight soil 60 on the other end side. The portion is supported and fixed to the base 81 via box-shaped supporting portions 86 and 87. As described above, the discharge port 84 of the mixer main body 85 is the injection pump 54.
It can be connected to the intake side of.

Inside the mixer main body 85, there is provided a stirring section 88 for stirring the mortar 3 and bubbles in a low pressure state of 0 to 0.1 MPa or a negative pressure state. The stirring unit 88 includes a stirring shaft 89 rotatably arranged at the shaft center of the mixer main body 85, and a stirring blade unit 90 attached to the outer circumference of the stirring shaft 89.

The stirring blade portion 90 is a part of the stirring blade 91 for stirring the mortar 3 and the air bubbles, and a propelling blade 91 for imparting a propulsive force toward the discharge port 84 while stirring the mortar 3 and the bubbles. Portion 92 for returning the air to the supply ports 82, 83 side
And have.

The propulsion blades 91 are composed of a plurality of paddles (three in FIG. 6) arranged at a predetermined pitch in the circumferential direction on the outer circumference of the stirring shaft 89. Each paddle has an inclination of a required angle for applying a propulsive force toward the discharge port 84 side to the mortar 3 and bubbles that are being stirred as the stirring shaft 89 rotates. Further, the return portion 92 is configured as a gap formed between the paddles that are adjacent to each other in the circumferential direction. This paddle is formed in multiple stages (7 stages in FIG. 5) in the axial direction of the stirring shaft 89.

Further, at a position on the other end side of the discharge shaft 84 of the stirring shaft 89, the propelling force of the propelling blades 91 on the mortar 3 and bubbles is reduced, and bubbles are lightly mixed into the shaft bearing 95 described later. Reverse blades 93 are attached to prevent the soil 60 from sticking. Like the propulsion blade 91, the reverse blade 93 is composed of a plurality of paddles (three in FIG. 7) arranged at a predetermined pitch in the circumferential direction on the outer circumference of the stirring shaft 89. There is. Each paddle has an inclination opposite to the paddle of the propulsion blade 91. A gap is formed between the paddles that are adjacent to each other in the circumferential direction. Further, the paddle is formed by one step in the axial direction of the stirring shaft 89.

The stirring shaft 89 is connected to the mixer main body 85.
Shaft support portions 94 and 95 are inserted into the support portions 86 and 87 disposed at both ends of the support shaft 86 and 87, and the support portions 86 and 87 are provided with shaft support portions 94 and 95 for rotatably supporting both end portions of the stirring shaft 89. There is.
The shaft support portions 94 and 95 include, for example, a gland packing.

Further, one end of the stirring shaft 89 is extended and protruded outward from the support portion 86, and a V pulley 97 is attached to the tip of this protruding portion. And this V
The pulley 97 is a driving device 100 such as a motor fixed to the base 81 via a V belt 98 and another V pulley 99.
It is connected to the. The support 86 has a stirring shaft 89.
The bearing portion 101 is provided to support the protruding portion of the bearing. The bearing portion 101 includes an oil seal 102 and a bearing 103.

Next, the operation of this embodiment will be described.

In the above-described apparatus 1 for producing lightweight soil containing air bubbles, as shown in FIG. 1, the mortar 3 from the agitator equipment 4 is used.
The lightweight soil material such as the above and the bubbles generated by the automatic foaming device 15 are sent to the mixer 58 through the mortar channel 57 and the bubble channel 59, respectively, and the mixer 58 generates the bubble-containing lightweight soil 60. Then, the bubble-containing lightweight soil 60 generated by the mixer 58 is pressure-fed for a long distance by using the injection pump 54 and is set at the setting point.

At this time, in the mixer 58, as shown in FIG. 5 and the like, the supply ports 82, 8 on one end side of the mixer main body 85 are provided.
When the stirrer 88 is driven by the driving device 9 by supplying the mortar 3 and bubbles from the stirrer 3, the stirrer blade 9 of the stirrer 88
0 stirs the mortar 3 and bubbles in a low pressure state of 0 to 0.1 MPa or a negative pressure state to generate the bubble-containing lightweight soil 60.

At this time, the propelling blade 91 of the stirring blade portion 90 stirs the mortar 3 and the air bubbles and propels them toward the discharge port 84 side. As a result, the lightweight soil 60 containing bubbles is generated.
It is possible to give propulsive force to. In addition, the returning portion 92 of the stirring blade portion 90 partially returns to the supply ports 82 and 83 side during stirring of the mortar 3 and bubbles, whereby local repeated stirring is performed at any time. As a result, the effect of mixing bubbles with the mortar 3 can be improved.

At the other end of the mixer main body 85,
The reverse blade 93 provided on the other end side of the stirring shaft 89 is the driving blade 91.
By partially reducing the propulsive force due to, it is possible to reduce the load acting on the shaft support portion 95 on the other end side.
As a result, it is possible to prevent the lightweight soil 60 containing air bubbles from sticking to the shaft bearing 95 and improve the durability of the shaft bearing 95.

Furthermore, by connecting the outlet 84 of the mixer main body 85 to the suction side of the injection pump 54, the injection pump 54 is not the mortar 3 itself, but the bubble-containing lightweight soil 60 having a small specific gravity and excellent fluidity. Since pressure feeding is performed, it is possible to perform long-distance pressure feeding with one injection pump 54, and it is possible to eliminate the movement of equipment even when placing the bubble-containing lightweight soil 60 on a large scale. .

In addition, the control device 77 sends the control signal 7 to the inverter power supply device 73 based on the mortar flow rate signal 70 indicating the flow rate of the mortar 3 measured by the mortar flow meter 56.
Injection pump 5 by sending 5 to change the frequency
The flow rate of the mortar 3 is controlled so that a constant flow rate of the mortar 3 can be sent to the mixer 58 regardless of the influence of the viscosity of the mortar 3 and the head pressure.

Further, the control device 77 uses the mortar flow meter 5
Based on the mortar flow rate signal 70 indicating the flow rate of the mortar 3 measured in 6, the automatic foaming apparatus 15 is controlled by sending the interlocking signal 76 to the automatic foaming apparatus 15, and thus the amount of bubbles corresponding to the flow rate of the mortar 3 is generated. It can be sent to the mixer 58.

[0044]

As described above, according to the first aspect of the present invention, when the lightweight soil raw material and the air bubbles are supplied from one end side of the mixer main body to drive the stirring unit, the stirring unit drives the lightweight soil raw material. And the bubbles are agitated in a low pressure or negative pressure state to generate a lightweight soil mixed with bubbles. At this time, the propelling blades of the stirring unit stir the lightweight soil raw material and the air bubbles and propel them toward the discharge side. As a result, it becomes possible to give a propulsive force to the generated light-air mixed soil with bubbles. In addition, since the returning part of the stirring part returns a part thereof to one end side during the stirring of the lightweight soil raw material and the air bubbles, the local repeated stirring can be performed at any time. The effect of mixing bubbles can be improved.

According to the second aspect of the present invention, the reverse blade attached to the discharge side of the other end of the mixer main body prevents the lightweight soil mixed with air bubbles from being fixed.

According to the third aspect of the present invention, by connecting the discharge port of the mixer main body to the suction side of the injection pump, the injection pump is not the lightweight soil raw material itself, but is mixed with air bubbles having a small specific gravity and excellent fluidity. Since lightweight soil is pumped, it is possible to pump for a long distance with one injection pump, and it is possible to eliminate the movement of equipment even when placing lightweight soil mixed with bubbles on a large scale. it can.

According to the invention of claim 4, the control device sends a control signal to the inverter power supply device of the injection pump to change the frequency based on the lightweight soil material flow rate signal measured by the lightweight soil material flow meter. Since the flow rate of the injection pump is controlled by the above, a constant flow rate of the lightweight soil raw material can be sent to the mixer body regardless of the influence of the viscosity of the lightweight soil raw material and the head pressure.

According to the invention of claim 5, the control device controls the automatic foaming device by sending an interlocking signal to the automatic foaming device for generating bubbles based on the lightweight soil material flow rate signal measured by the lightweight soil material flow meter. Therefore, it is possible to exert a practically useful effect that the amount of bubbles according to the flow rate of the lightweight soil raw material can be sent to the mixer.

[Brief description of drawings]

FIG. 1 is a system diagram of a bubble-containing lightweight soil pouring system according to an embodiment of the present invention.

FIG. 2 is a plan view of the apparatus for manufacturing lightweight soil mixed with air bubbles of FIG.

FIG. 3 is a side view of FIG.

FIG. 4 is an end view of FIG.

5 is a side sectional view similar to FIG.

6 is a cross-sectional view taken along the line AA of FIG.

7 is a sectional view taken along line BB of FIG.

[Explanation of symbols]

3 Mortar (lightweight soil material) 15 Automatic foaming equipment 54 infusion pump 56 Mortar flow meter (light weight soil material flow meter) 58 mixer 60 lightweight soil mixed with air bubbles 70 Mortar flow signal (light weight soil material flow signal) 73 Inverter power supply 75 Control signal 76 interlocking signal 77 Control device 82 Mortar supply port 83 Air bubble supply port 84 outlet 85 Mixer body 88 stirring section 89 stirring shaft 90 Stirring blade 91 Propulsion blade 92 Return section 93 Reverse blade 94 Shaft bearing 95 Shaft bearing

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) B01F 15/02 B01F 15/02 C 15/04 15/04 D (71) Applicant 502128419 Underground Waterproofing Industry Co., Ltd. 6-84 Tsushimaya, Niigata City, Niigata Prefecture (72) Inventor Kazumasa Hishinuma 2-17-4, Yanagibashi, Taito-ku, Tokyo Alps Third Building, Onoda Chemiko Co., Ltd. (72) Inventor Makoto Amemiya Nagoya City, Aichi Prefecture 2-15-20 Nishiki, Naka-ku Sannaga Fushimi Building, Inoda Chemiko Co., Ltd. (72) Inventor Hiroshi Yoshinaga 2-5, Chikudo-Hachiman-cho, Shinjuku-ku, Tokyo Japan Construction Machinery Trading Co., Ltd. (72) Inventor Irizawa Akio 1230 Koinari Shinjuku, Ina-cho, Kita-Adachi-gun, Saitama Nissei Engineering Co., Ltd. (72) Inventor Eiji Kajita 6-84 Tsushimaya, Niigata City, Niigata Prefecture In-company F-term (reference) 4G035 AB17 AE02 AE13 4G036 AC37 4G037 AA01 AA13 AA18 BA03 BB01 BC02 BD01 BD04 EA03 4G078 AA03 AB02 BA01 BA09 CA01 CA05 CA12 CA20 DA01 DB02 EA01 EA10

Claims (5)

[Claims] 1. A hermetic mixer body capable of supplying a lightweight soil material and bubbles to one end side and discharging a bubble-containing lightweight soil from the other end side; A stirring unit that stirs the soil material and air bubbles in a low pressure or negative pressure state, the agitation unit propels the lightweight soil material and air bubbles toward the discharge side at the other end while stirring the light soil material and the air bubbles, and a lightweight A device for producing lightweight soil containing air bubbles, comprising: a return part for returning a part of the soil material and air bubbles to one end side during stirring. 2. The production of aerated lightweight soil according to claim 1, wherein a reverse blade is attached to the discharge side of the other end of the mixer body to prevent the aerated lightweight soil from sticking to the shaft support portion. apparatus. 3. The bubble-containing lightweight soil producing apparatus according to claim 1, wherein the outlet of the mixer body can be connected to the suction side of an injection pump. 4. The flow rate of the infusion pump is controlled by sending a control signal to the inverter power source device of the infusion pump to change the frequency based on the light weight soil material flow rate signal measured by the lightweight soil flow rate meter. The bubble-containing lightweight soil producing apparatus according to claim 3, further comprising a control device for sending a constant flow rate of the lightweight soil material to the mixer body regardless of the influence of the viscosity of the lightweight soil material or the head pressure. 5. An automatic foaming device is controlled by sending an interlocking signal to an automatic foaming device for generating bubbles based on a lightweight soil material flow signal measured by a lightweight soil material flow meter, thereby determining the flow rate of the lightweight soil material. 5. The bubble-containing lightweight soil producing apparatus according to claim 1, further comprising a control device for sending a corresponding amount of bubbles to the mixer.