JP2007136919A - Manufacturing method of lightweight civil engineering material and metering supply device of granular weigh reducing material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a technique for continuously supplying a granular weight reducing material quantitatively to efficiently mix the same. <P>SOLUTION: The suction due to a suction means 50 is performed from a suction port 38s with respect to a chamber 36 communicating with a supply port while rotating a plurality of chambers 36 with a predetermined radius of rotation and the granular weigh reducing material in a storage part 2 is sucked and introduced into the chamber 36 through a supply port 37i while air is sent into the chamber 36 communicating with a send-out port 37x from an air sending port 36b by an air sending means 60. The granular weight reducing material 1x in the chamber 36 is sent out to a mixer 4 from the send-out port 37x while carried by the sending air and mixed with a target material 5 in the mixer 4 to manufacture a lightweight civil engineering material. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a technique for manufacturing a lightweight civil engineering material by mixing granular light-weighting materials such as foam beads and foamed resin crushed pieces with target materials such as soil-based materials and cement-based materials.

Recently, the interest in the use of lightweight civil engineering materials has been increasing for the purpose of reducing the burden on the supporting ground, for example, in the lining embankment for widening the slope. Lightweight civil engineering materials include air-mixed lightweight soil made by mixing air bubbles with solidified material such as cement-based materials, and granular lightweight materials such as foam beads and foamed resin fragments mixed with soil-based materials and cement-based materials. A granular material-mixed lightweight soil (see, for example, Patent Document 1) is representative.
The former light-bubble mixed lightweight soil is a consolidated body premised on the use of a solidifying material, whereas the latter granular material mixed lightweight soil maintains general soil properties when mixed with soil-based materials. In addition to this, even when mixed with the solidified material, there is an advantage that it is not defoamed like bubbles.
JP 2004-132165 A

However, when manufacturing a lightweight soil mixed with granular materials, the specific gravity difference between the granular lightweight material and the target material is large, and mixing with a general pug mill or pan mixer is difficult, so a sealed special mixer is required. Therefore, continuous mass production tends to be very uneconomical, resulting in poor competitiveness with other construction methods.
The mixing stage can be solved by using a pipe-type mixer that performs continuous mixing while maintaining a hermetically sealed state, but there is no device that can stably and continuously supply light weight materials to such a mixing device. is the current situation.
Then, the main subject of this invention is providing the technique which supplies a fixed quantity of granular light weight material continuously, and mixes it efficiently.

The present invention that has solved the above problems is as follows.
<Invention of Claim 1>
A method for producing a lightweight civil engineering material by extracting a particulate lightening material stored in a storage unit by a metering supply device and supplying it to a mixing device, and mixing the granular lightening material and a target material with the mixing device,
The metering supply device communicates via a rotation drive source, a plurality of chambers rotated by the rotation drive source with a predetermined rotation radius, a supply port communicating with at least one chamber, and the supply port and the chamber. A suction port, a suction means connected to the suction port, a breathable filter that prevents the movement of the particulate lightening material from the chamber to the suction port side, and a chamber that communicates with the supply port. An air supply port, an air supply port communicating with the air supply port via the distribution chamber, and an air supply means connected to the air supply port,
While rotating the plurality of chambers, the suction means sucks the chamber communicating with the supply port from the suction port, and sucks the particulate lightening material from the storage portion into the chamber through the supply port. Introducing and supplying air by the air supply means from the air supply port to the chamber communicating with the air outlet, the particulate lightening material in the chamber is put on the air supply and mixed from the gas outlet To send to the device,
A method for producing a lightweight civil engineering material.

(Function and effect)
The main feature of the present invention is the metering device. That is, the metering device of the present invention rotates a plurality of chambers, introduces a weight-reducing material by suction at a position communicating with the supply port for each chamber, and measures the weight-reducing material by the volume in the chamber. At the position communicating with the delivery port, the weight-reduced material weighed in the chamber is delivered by air supply. As described above, by actively supplying and discharging the light weight material in the chamber using suction / air supply, the light material can be stably and continuously metered.

<Invention of Claim 2>
The method for producing a lightweight civil engineering material according to claim 1, wherein a solidifying material is used as the target material, and a stabilizer in the in-situ mixing method is produced by mixing a lightening material with the solidifying material.

(Function and effect)
The present invention is suitable for producing a lightweight stabilizer used in an in-situ mixing method such as a deep mixing method.

<Invention of Claim 3>
The method for manufacturing a lightweight civil engineering material according to claim 1, wherein a soil-based material is used as the target material, and a reinforced lightweight soil is manufactured by mixing a reinforced material together with a granular lightweight material with respect to the target material.

(Function and effect)
In the present invention, not only can the particulate lightening material be mixed with the material to be lightened, but also other materials can be added. In particular, as described in this section, a reinforced lightweight soil is produced by using a reinforcing material. It is a preferred form.

<Invention of Claim 4>
A rotation drive source, a plurality of chambers rotated by the rotation drive source with a predetermined rotation radius, a supply port communicating with at least one chamber, a suction port communicating with the supply port via the chamber, and the suction A suction means connected to the mouth, a breathable filter that prevents the movement of the particulate lightening material from the inside of the chamber to the suction mouth side, an air feed port that communicates with a chamber other than the chamber with which the supply port communicates, An air outlet connected to the air inlet through the distribution chamber; and an air supply means connected to the air outlet;
While rotating the plurality of chambers, suction by the suction means is performed from the suction port to the chamber communicating with the supply port, and the particulate lightening material is sucked and introduced into the chamber from the supply port. It is configured to perform air supply by the air supply means from the air supply port to the chamber communicating with the outlet, and to send the particulate lightening material in the chamber from the outlet through the air supply.
A metering and feeding device for granular light weight material.

(Function and effect)
The metering device of the present invention rotates a plurality of chambers, introduces a light weight material by suction into at least one chamber at a certain position, and sends the light weight material introduced at another position by air supply. Thus, by actively feeding and discharging the lightening material in the chamber using suction / air feeding, the light material can be stably and continuously metered. .

<Invention of Claim 5>
The metering / supplying device for granular light-weighting material according to claim 4, wherein the breathable filter is provided at a chamber side end of the suction port.

(Function and effect)
By providing the filter on the suction port side, there are advantages such that the number of filters is small, maintenance is easy, and cost is not increased.

<Invention of Claim 6>
The metering supply device of the granular light weight material of Claim 4 with which the said air permeable filter is each provided in the said suction port side edge part in all the chambers.

(Function and effect)
When filters are provided in all the chambers in this manner, even if the filter is clogged by suction, the clogging material can be removed by air supply from the opposite side to that during suction after suction. In other words, there is an advantage that the clogging removing action always works during operation.

<Invention of Claim 7>
The exhaust gas discharged by suction of the suction means instead of the air supply means or together with the air supply means is supplied to the air supply port and used for the air supply. A metering device for granular light weight material as described in 1.

(Function and effect)
In this way, when air is sent using the exhaust of the suction means, not only the efficiency of energy utilization is increased, but also the lightweight material leaking from the filter is automatically returned to the air supply side for mixing. There is an advantage that can be.

  As described above, according to the production method of the present invention, it is possible to continuously and quantitatively supply the granular lightweight material, and to efficiently produce a lightweight civil engineering material.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
FIGS. 1 to 4 show examples of manufacturing facilities for lightweight civil engineering materials, respectively. A storage portion 2 such as a hopper for storing granular lightweight materials (hereinafter also simply referred to as lightweight materials) 1 and a lightweight material. The metering supply device 3 and the mixing device 4 are configured.

  The weight reduction material 1 is stored in the storage unit 2, and a necessary amount is extracted by the measuring device 3. As the weight-reducing material 1, foamed resin such as foamed beads and polystyrene, crushed small pieces obtained by crushing the foamed resin, volume-reduced foamed beads (thinned by applying heat to the crushed small pieces), etc. are used. Can do. The particle size of the light weight material 1 is not particularly limited, but is preferably about 1 mm to 10 mm.

  The metering supply device 3 includes a metering unit 30, a suction unit 50 and an air feeding unit 60. In the measuring unit 30, a rotary shaft 32 is supported horizontally on a base 31, and this rotary shaft 32 is connected to a rotary drive source 34 such as a motor via a transmission means 33 such as a chain. It is driven to rotate at a predetermined speed.

  A cylindrical rotor 35 is fixed coaxially with the rotation shaft 32. The rotor 35 is provided with a plurality of chambers 36 at equal intervals from the rotation shaft 32 at equal intervals in the rotation direction. The chamber 36 has a cylindrical shape having a central axis parallel to the rotation shaft 32, and opens on one end surface and the other end surface of the rotor 35 in the rotation axis direction.

  Further, ring-shaped lids 37 and 38 are in close contact with the one end surface and the other end surface of the rotor 35 in the direction of the rotation axis, respectively, so as to cover the entire rotation locus of the chamber 36 and to be freely slidable. In addition, a supply port 37i is provided at a portion corresponding to the rotation trajectory of the chamber 36 in any one of the lids 37, and the position is shifted in the rotation direction from the supply port 37i (in the illustrated example, the supply port 37i and the rotation shaft). The outlet 37x is provided at a position symmetrical with respect to 32. Further, a suction port 38s is provided at a position facing the supply port 37i in the other lid 38, and an air supply port 38b is provided at a position corresponding to the delivery port 37x.

  In order to prevent the movement of the particulate lightening material from the inside of the chamber 36 toward the suction port 38s, in the illustrated example, a breathable filter 39 is provided at the end of the suction port 38s on the chamber 36 side. In place of this breathable filter, although not shown, a breathable filter may be provided at the end of each chamber 36 on the suction port 38s side.

  The suction means 50 is connected to the suction port 38s, and the air supply means 60 is connected to the air supply port 38b. A blower fan or the like can be used as the suction unit 50, and an air compressor or the like that supplies compressed air can be used as the air supply unit 60 in addition to the blower fan. The suction means 50 and the air supply means 60 may be configured by independent devices. However, since the suction means 50 is accompanied by exhaust air, the exhaust air is one of the air supply means as indicated by a two-dot chain line in the figure. It can be used as a part or all (if all, the apparatus constituting the air supply means 60 can be omitted).

  When manufacturing the civil engineering material, the rotation drive source 34 is operated, and the suction means 50 and the air supply means 60 are operated. As a result, each chamber 36 rotates and moves around the rotation shaft 32, and in the moving process, the openings at both ends are in communication with the supply port 37i and the suction port 38s, respectively. It becomes a position sealed by the lids 37, 38, and this time the openings at both ends are in communication with the delivery port 37x and the air delivery port 38b, respectively, and then the openings at both ends are sealed by the lids 37, 38. Repeat the cycle of position.

  The suction force of the suction means 50 acts on the chamber 36 moved to a position communicating with the supply port 37i and the suction port 38s, and the granular lightening material 1 in the storage unit 2 is supplied via the suction port 38s. Suction is introduced into the chamber 36 through the port 37i. At this time, the material introduced into the chamber 36 due to the presence of the filter 39 does not move to the suction port 37 i side but is filled into the chamber 36. At this time, an amount of the lightening material 1x corresponding to the volume is measured in the chamber 36.

  The chamber 36 filled with the weight-reducing material 1 is moved to a position communicating with the air outlet 37x and the air inlet 38b through a state of being sealed by the lid bodies 37 and 38 due to the rotational movement thereof, and from the air outlet 38b. Air 61 is blown in by the air feeding means 60, and the lighter material 1x in the chamber 36 is sent out from the air outlet 37 x on the air 61 and supplied to the mixing device 4. The emptied chamber 36 returns to a position where it is communicated with the supply port 37 i and the suction port 38 s after being sealed by the lids 37, 38, and is filled with the particulate lightening material 1.

  In this way, by actively feeding and discharging the weight-reducing material 1 in the chamber 36 using suction / air feeding, a light material can be stably and continuously metered.

  In particular, as shown by a two-dot chain line, when the exhaust gas 52 of the intake air 51 by the suction means 50 is used as the air supply 61 and is used as the carrier air to the mixing device 4, not only the energy use efficiency increases but also the filter 39 passes through. Even if there are fine particles to be passed, they pass through the suction means 50 as they are and are automatically returned into the chamber 36 from the air supply port 38 b and supplied to the mixing device 4. Therefore, since a somewhat coarse filter can be used, there is an advantage that clogging hardly occurs. This effect is particularly remarkable when the filter 39 is provided only on the suction port 38s side.

  On the other hand, when the air supply 61 is constituted only by another device, the suction exhaust 52 is released into the atmosphere, and dust removal processing using a bag filter or the like is necessary. In this case, this problem is unlikely to occur because the particle sizes are uniform to some extent.

  In addition, when the filter 39 is installed in each chamber 36 (not shown), even if the filter 39 is clogged with suction, the air supply 61 is performed from the opposite side of the suction after suction. The material clogged by the air 61 can be pushed out and removed. That is, the clogging removing action always works during the operation of the apparatus.

  On the other hand, in the mixing device 4, mixing with the separately supplied target material 5 is performed, and the lightweight civil engineering material 6 is manufactured and discharged.

  The mixing device 4 is not particularly limited as long as the mixing object of the present invention can be mixed, and can be used as a batch type closed mixer or a continuous closed mixer. As shown in the illustrated example, the continuous mixer includes a pipe 4p, a material input port 4i and a discharge port 4x provided at intervals in the pipe axis direction of the pipe 4p, and a pipe shaft in the pipe 4p. A pipe-type mixer 4 having a rotating shaft 4a that is arranged along the axis of the rotating shaft 4 and is rotationally driven, and a plurality of stirring blades 4w that have a transfer and stirring function that are provided in a projecting manner in the longitudinal direction of the rotating shaft 4a. It is. In the illustrated example, a screw blade 4s is provided at a portion of the rotating shaft 4a corresponding to the material input port 4i, and the target material 5 input from the material input port 4i is extruded toward the downstream side by the screw blade 4s. After that, it is transferred to the discharge port 4x while being stirred and mixed by the stirring blade 4w. The weight reducing material 1x is supplied from the material input port 4i, and the rotary shaft 4a is a hollow shaft as shown in the figure, and the discharge port 4d is formed in the portion after the material input port 4i, through these. It can supply in the target material 5 in the pipe line 4p from parts other than the material inlet 4i. In the present invention, other material 7 can be added in addition to the weight reducing material 1x. In this case, the other material 7 is supplied from the material inlet 4i as shown in the drawing, and discharged as necessary. It can also be supplied via the outlet 4d.

  Examples of the target material 5 to be mixed with the lightening material 1x include soil-based materials such as mud and non-aqueous soil sand, cement-based materials such as cement particles, mortar, and concrete, or a mixture thereof such as cement-mixed soil. Can be mentioned. For example, when a solidifying material such as cement milk or mortar is used as the target material, stabilizers in various in-situ mixing methods such as a deep mixing method can be manufactured.

  Furthermore, as the material 7 other than the weight reducing material 1x, for example, a reinforcing material for increasing the material strength can be used. As a material of the reinforcing material, a metal material such as a wire can be used in addition to a fiber material made of synthetic or natural fibers. As the shape of the reinforcing material, an appropriate continuous raw material having a predetermined length, such as a thread shape, a string shape, a belt shape, a bundle shape (including not only those bundled in parallel but also a twist shape such as a strand), for example, It can be made into the elongate shape cut | disconnected to 10 cm or less, 5 cm or less, or 1 cm or less. For example, a reinforced lightweight soil suitable as embankment or the like can be produced by mixing a particulate lightening material and a reinforced material into a soil material.

  The present invention can be applied to a wide range of applications as long as a granular civil engineering material is mixed with a target material to produce a lightweight civil engineering material.

It is the schematic which shows the example of manufacturing equipment of lightweight civil engineering material. It is a front view which shows the example of a lightweight supply apparatus. FIG. 3 is a sectional view taken along line III-III in FIG. 2. It is IV-IV sectional drawing of FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Granular weight reduction material, 2 ... Storage part, 3 ... Metering supply apparatus, 4 ... Mixing apparatus, 5 ... Target material, 6 ... Measurement civil engineering material, 30 ... Measurement part, 31 ... Base, 32 ... Rotary shaft, 33 ... Transmission means, 34 ... Rotation drive source, 35 ... Rotor, 36 ... Chamber, 37,38 ... Cover, 37i ... Supply port, 37x ... Discharge port, 38s ... Suction port, 38b ... Air supply port, 39 ... Filter, 50 ... suction means, 60 ... air supply means.

Claims (7)

A method for producing a lightweight civil engineering material by extracting a particulate lightening material stored in a storage unit by a metering supply device and supplying it to a mixing device, and mixing the granular lightening material and a target material with the mixing device,
The metering supply device communicates via a rotation drive source, a plurality of chambers rotated by the rotation drive source with a predetermined rotation radius, a supply port communicating with at least one chamber, and the supply port and the chamber. A suction port, a suction means connected to the suction port, a breathable filter that prevents the movement of the particulate lightening material from the chamber to the suction port side, and a chamber that communicates with the supply port. An air supply port, an air supply port communicating with the air supply port via the distribution chamber, and an air supply means connected to the air supply port,
While rotating the plurality of chambers, the suction means sucks the chamber communicating with the supply port from the suction port, and sucks the particulate lightening material from the storage portion into the chamber through the supply port. Introducing and supplying air by the air supply means from the air supply port to the chamber communicating with the air outlet, the particulate lightening material in the chamber is put on the air supply and mixed from the gas outlet To send to the device,
A method for producing a lightweight civil engineering material.   The method for producing a lightweight civil engineering material according to claim 1, wherein a solidifying material is used as the target material, and a stabilizer in the in-situ mixing method is produced by mixing a lightening material with the solidifying material.   The method for manufacturing a lightweight civil engineering material according to claim 1, wherein a soil-based material is used as the target material, and a reinforced lightweight soil is manufactured by mixing a reinforced material together with a granular lightweight material with respect to the target material. A rotation drive source, a plurality of chambers rotated by the rotation drive source with a predetermined rotation radius, a supply port communicating with at least one chamber, a suction port communicating with the supply port via the chamber, and the suction A suction means connected to the mouth, a breathable filter that prevents the movement of the particulate lightening material from the inside of the chamber to the suction mouth side, an air feed port that communicates with a chamber other than the chamber with which the supply port communicates, An air outlet connected to the air inlet through the distribution chamber, and an air supply means connected to the air outlet;
While rotating the plurality of chambers, suction by the suction means is performed from the suction port to the chamber communicating with the supply port, and the particulate lightening material is sucked and introduced into the chamber from the supply port. It is configured to perform air supply by the air supply means from the air supply port to the chamber communicating with the outlet, and to send the particulate lightening material in the chamber from the outlet through the air supply.
A metering and feeding device for granular light weight material.   The metering / supplying device for granular light-weighting material according to claim 4, wherein the breathable filter is provided at a chamber side end of the suction port.   The metering supply device of the granular light weight material of Claim 4 with which the said air permeable filter is each provided in the said suction port side edge part in all the chambers.   The exhaust gas discharged by suction of the suction means instead of the air supply means or together with the air supply means is supplied to the air supply port and used for the air supply. A metering device for granular light weight material as described in 1.

Images