JP6902858B2 - Fiber disperser and concrete manufacturing equipment - Google Patents

Description

The present invention relates to a fiber disperser in which fibers contained in concrete containing mortar are more evenly dispersed, and a concrete production device for producing fiber reinforced concrete.

Conventionally, various fibers such as steel fibers and synthetic resin fibers have been mixed in concrete in order to restrain cracks in concrete and mortar and prevent peeling. As a method for producing such fiber-reinforced concrete, for example, the one described in Patent Document 1 has been proposed.

In this method, ready-mixed concrete is charged into the drum of an agitator truck from a mixer, and fibers such as polypropylene fibers are charged into the drum. When the fibers are put into the agitator truck, the fibers are placed on the upper center of the ready-mixed concrete dropped from the mixer to the hopper to prevent the fibers from adhering to the hopper. In addition, a surfactant is attached to the surface of the fibers to prevent the generation of fiber balls due to the entanglement of the fibers. Then, by rotating the drum at a low speed during operation, the fibers can be evenly mixed in the ready-mixed concrete.

JP-A-2002-187124

However, in the manufacturing method as described in Patent Document 1, various fibers such as polypropylene fibers before charging are entangled with each other and are lumpy. Therefore, depending on the rotary drum and stirring blade of the agitator truck, the fibers may be contained in concrete. The fibers could not be loosened and dispersed sufficiently. Therefore, there is a drawback that the fibers cannot be evenly dispersed in the concrete. When such lumpy fibers were present in the hardened concrete, the concrete strength was weak.

For example, when a tunnel segment is manufactured from fiber reinforced concrete manufactured by the concrete manufacturing method of Patent Document 1, the fiber mass in the segment melts intensively with high heat when a fire occurs in the tunnel due to a traffic accident or the like. This creates a large enclosed space inside. Therefore, the sealed space in the hot segment may be filled with water vapor in the concrete, causing explosions or cracks in the concrete wall due to an increase in vapor pressure or temperature, which may cause the concrete to collapse.

The present invention has been made in view of such a problem, and provides a fiber disperser capable of more evenly dispersing entangled fiber lumps and a concrete manufacturing apparatus provided with this device. The purpose.

The fiber disperser according to the present invention is a fiber disperser for dispersing the supplied fibers, and is a square tubular housing for inserting the fibers and a mesh provided in the housing for passing the fibers. A vibrating machine that vibrates the mesh, a stirrer that is provided on the downstream side of the mesh and disperses the input fibers by the rotation of the stirring blade, and is installed at the four corners of the housing around the stirrer. It is characterized by being provided with fibers that do not come into contact with the stirring blades and an air nozzle that blows away the fibers scattered by the stirrer.
According to the present invention, when the fibers including the fiber lumps and the like put into the housing of the fiber disperser pass through the mesh, the fibers are more evenly dispersed because the mesh is vibrated by the exciter. Will be done.

Moreover, when the fibers pass through the mesh, the mesh is dispersed because it is vibrated by the exciter, and is further dispersed by the stirring blades of the agitator installed on the downstream side thereof to disperse the fibers more evenly. Can be done.

Further, a dispersion rod member which is arranged on the downstream side of the stirrer and further disperses the fibers blown off by the air nozzle may be provided.

The concrete manufacturing apparatus according to the present invention includes the fiber disperser and the mixer described in any of the above, and mixes the fibers dispersed by the fiber disperser into the concrete material or ready-mixed concrete of the rotating mixer. It is characterized in that the fibers are dispersed in concrete and mixed.
In the concrete manufacturing apparatus according to the present invention, the fibers well dispersed by the fiber dispersing apparatus can be put into the drum of the concrete manufacturing apparatus to be dispersed and mixed in the concrete agitated in the drum. In the present invention, concrete contains mortar.

According to the fiber disperser of the present invention, fibers such as fiber lumps can be agitated and dispersed by a vibrating mesh in the housing and a stirrer.
Therefore, according to the concrete manufacturing apparatus of the present invention, the fibers dispersed by the fiber disperser can be dispersed and mixed in the concrete, and the obtained fiber-reinforced concrete product is cracked even when exposed to high heat. And explosion can be prevented.

It is explanatory drawing of the concrete manufacturing apparatus by embodiment of this invention. It is a schematic perspective view of the fiber disperser according to an embodiment. It is explanatory drawing which shows the structure which provided the exciter in the frame part of the mesh of the fiber disperser shown in FIG. It is explanatory drawing of the main part of the state in which the fiber is put into the mesh of the fiber disperser according to the modification.

Hereinafter, the fiber disperser according to the embodiment of the present invention and the concrete manufacturing apparatus thereof will be described with reference to FIGS. 1 to 3.
FIG. 1 is an explanatory view of a concrete manufacturing apparatus 2 provided with the fiber dispersion apparatus 1 according to the embodiment. In this concrete manufacturing apparatus 2, cement, sand, gravel, an admixture such as blast furnace slag, water and the like are put into the mixer 3 and the mixer 3 is rotated to knead the concrete to produce fiber-reinforced concrete. Moreover, in the present embodiment, the fibers are evenly dispersed in the concrete by putting them into the mixer 3 in a state where resin fibers such as polypropylene fibers are dispersed as reinforcing fiber materials in these concrete materials and kneading them. Manufacture mixed fiber reinforced concrete. Further, the fibers may be dispersed and mixed in the mortar instead of the concrete, and in the following description, the concrete including the mortar will be described.

In the present embodiment, in addition to polypropylene fibers, polyolefin fibers such as polyethylene, organic fibers such as vinylon fibers and the like may be used, as well as metal fibers such as steel fibers, inorganic fibers such as mineral fibers, and carbon. Fibers, aramid fibers and the like may be used.
Further, two or more kinds of these fibers can be mixed and used. The fiber may be either a long fiber or a short fiber.

As shown in FIG. 1, the concrete manufacturing apparatus 2 using such fibers has a cement measuring hopper 5 that measures cement C as a water-hard substance powder and supplies it to a mixer 3, and a fine aggregate (sand). It is provided with a measuring hopper 6, a coarse aggregate (gravel) measuring hopper 7, an admixture measuring hopper 8 such as a blast furnace slag, and a water measuring hopper 9. In addition, a fiber measuring hopper 10 for reinforcing concrete (or mortar) with fibers is also installed.
The fibers charged into the fiber measuring hopper 10 are intertwined with each other and are often in the form of lumps. In order to disperse such lumpy fibers, a fiber disperser 1 is installed on the downstream side of the fiber measuring hopper 10.

Next, the fiber disperser 1 will be described with reference to FIGS. 2 and 3.
In the fiber dispersion device 1, for example, a mesh-like or lattice-like mesh 14 made of metal, for example, is installed in the fiber supply port 13a of the quadrangular tubular housing 13. A guide wall 12 is installed around the mesh 14 to prevent fibers from scattering around the mesh 14. In FIG. 2, the guide walls 12 are provided on two surfaces along the wall surface of the housing 13, but may be provided on four surfaces. The frame 15 is fixed to the four sides of the peripheral edge of the mesh 14. In FIG. 1, the frame body 15 is covered with a cover member 17 installed around the mesh 14.
Further, in FIGS. 2 and 3, a vibrating machine 16 for vibrating the mesh 14 in the vertical or horizontal direction is installed on the upper part of the frame portion 15a on, for example, one side or two opposing sides of the frame body 15 in the mesh 14. The fiber lumps that fall from the fiber measuring hopper 10 can be separated and dispersed by the vibration of the mesh 14. An appropriate vibration machine 16 can be used, and for example, a vibrator, a vibration motor, or the like can be used.

Further, on the downstream side of the mesh 14, a stirrer 18 for stirring and dispersing the fibers is installed in the center of the housing 13. In the stirrer 18, a drive motor M is supported on the inner wall of the housing 13 via an arm (not shown), and a plurality of, for example, four stirrer blades 19 are attached to the shaft portion of the drive motor M.
Air nozzles 20 of an air blower are installed at the four corners around the agitator 18. The air nozzle 20 is connected to an air supply source (not shown) through an air tube 21 provided outside the housing 13. The air nozzle 20 can blow off the fibers scattered at the four corners where the stirring blade 19 does not reach.

Further, dispersion rod members 22 are installed as dispersion members in the vicinity of the facing wall surfaces of the housing 13 on the lower sides of both sides of the stirrer 18. The dispersion rod member 22 is installed facing the lower side of the air nozzle 20, and the fibers blown off by the air nozzle 20 at the four corners of the housing 13 collide with the dispersion rod member 22 to further disperse the fibers. Can be done. The dispersion rod member 22 may be installed along the inner walls of the four sides of the housing 13.
A fiber inlet 23 for feeding the dispersed fibers into the mixer 3 is formed on the bottom surface of the housing 13 below the stirrer 18.

The fiber dispersion device 1 and the concrete production device 2 according to the present embodiment have the above-described configurations, and then a concrete production method by the concrete production device 2 using the fiber dispersion device 1 will be described.
In the production of fiber-reinforced concrete, in the concrete manufacturing apparatus 2 shown in FIG. 1, a cement measuring hopper 5, a fine aggregate measuring hopper 6, a coarse aggregate measuring hopper 7, an admixture measuring hopper 8 such as a blast furnace slag, and a water measuring hopper 9 The admixtures such as cement, sand, gravel, and blast furnace slag, which are weighed as concrete materials, are put into the rotating mixer 3. At the same time, the fibers are also weighed by the fiber measuring hopper 10 and put into the fiber dispersing device 1.

In the fiber dispersion device 1, the weighed fibers are entangled and dropped as a fiber mass into the fiber supply port 13a of the housing 13. The fiber mass is caught by the mesh 14 installed in the fiber supply port 13a, but since the mesh 14 is vibrated by the exciter 16, the fiber mass caught in the mesh 14 is separated and dispersed by vibration. The dispersed fibers pass through the mesh 14 and collide with the stirring blades 19 rotated by the stirrer 18, are further finely divided and separated, and fall downward.
The fibers that do not come into contact with the stirring blade 19 are separated by the air blown out by the air nozzle 20 at the four corners of the housing 13. Further, some fibers are sprayed on the stirrer 18 to be further separated. Some of the other fibers collide with the dispersion rod member 22 and are similarly further dispersed. A part of the fibers scattered by the stirrer 18 also collides with the air nozzle 20, the dispersion rod member 22, and the like, and is further dispersed.

The fibers dispersed in two or more stages in this way fall from the fiber inlet 23 on the bottom surface of the housing 13 into the rotating mixer 3. Then, in the rotating mixer 3, the fibers dispersed together with the admixture such as cement, sand, gravel, and blast furnace slag are well kneaded to produce ready-mixed concrete containing fibers. The obtained ready-mixed concrete can be filled into a formwork of a segment, for example, to produce a concrete product such as a segment. Moreover, since this segment is well kneaded with other concrete materials in a well-dispersed state of fibers, a fiber-reinforced segment can be produced. The obtained fiber reinforced segment can be used to construct a tunnel wall surface or the like.

When a fire breaks out in a tunnel due to a traffic accident or the like, the fiber-reinforced segments according to the present embodiment are exposed to a high temperature, so that each fiber in the segment is melted by heat to form many small sealed cavities. In this case, since the fibers are finely dispersed in the concrete, even if the water vapor evaporated from the concrete flows into the cavity, the vapor pressure does not become large. That is, since no fiber mass is formed in the segment, a large cavity cannot be formed in the concrete, and the water vapor pressure generated by high heat does not become high pressure, so that the concrete does not explode or crack and can be prevented from collapsing. ..

As described above, according to the fiber disperser 1 according to the present embodiment and the concrete manufacturing apparatus 2 provided with the fiber disperser, the entangled fiber masses are uniformly dispersed in two or more stages by a vibrating mesh 14 and a stirrer 18. It can be distributed.
Then, by putting these fibers into the mixer 3 together with the concrete material and kneading them, it is possible to produce a high-strength fiber-reinforced concrete in which the fibers are well dispersed. Therefore, even if the obtained concrete products such as fiber reinforced segments are exposed to high temperature due to fire or the like, the volume of the cavities of the molten fiber traces is small and the water vapor pressure generated from the concrete is suppressed from becoming high pressure to prevent the concrete from becoming It can prevent the collapse by preventing it from exploding or cracking.

Although the fiber disperser 1 and the concrete manufacturing apparatus 2 according to the embodiment of the present invention have been described in detail above, the present invention is not limited to the above-described embodiment and is appropriate as long as the gist of the present invention is not changed. It can be modified, replaced, etc., all of which are included in the present invention. Hereinafter, modifications of the present invention and the like will be described, but the description will be omitted by using the same reference numerals for the same or similar parts and members as those in the above-described embodiment.

For example, in the fiber disperser 1 according to the above-described embodiment, the mesh 14 with the exciter 16 and the stirrer 18 disperse the fiber mass in two or more stages, but instead of this, the vibrator 16 disperses the fiber mass. The fiber disperser 1 may be configured only with the attached mesh 14.
Further, the fiber dispersion device 1 may be configured by installing the stirrer 18 in the housing 13 provided with the mesh 14 that does not vibrate. Alternatively, the fiber dispersion device 1 may be configured by omitting the mesh 14 and installing the stirrer 18 in the housing 13.
In either case, sufficient fiber dispersion ability can be exhibited.

Further, FIG. 4 shows a modified example of the fiber dispersion device 1 according to the embodiment. In this modification, the fiber measuring hopper 10 is not installed in the concrete manufacturing apparatus 2. In this modification, a worker manually opens a mass of fibers S packed in a predetermined amount and puts them into a vibrating mesh 14 from a fiber supply port 13a of the fiber dispersion device 1. Even in this modified example, the same effects as those in the above-described embodiment can be exhibited.

In the above-described embodiment, the fibers dispersed together with the concrete material such as cement and sand are put into the mixer 3 and kneaded to produce the fiber reinforced concrete. However, the present invention manufactures such concrete. It is not limited to the device 2. For example, the ready-mixed concrete produced by the mixer 3 from the concrete material is supplied to a drum of, for example, an agitator truck, and the fibers dispersed by the fiber disperser 1 are supplied to the drum at the same time or thereafter, and dispersed and mixed by the rotating drum. You may try to do it.
Even with this, since the fibers are evenly dispersed at the time of supply, they are well dispersed in the concrete, and the above-mentioned fiber reinforced concrete can be produced.

Further, in the above-described embodiment, the housing 13 of the fiber dispersion device 1 is formed in a quadrangular tubular shape, but instead, it may be formed in another polygonal tubular shape, a cylindrical shape, or the like. When the housing 13 is formed in a cylindrical shape or the like, it is not necessary to install the air nozzle 20 or the dispersion rod member 22.

1 Fiber disperser 2 Concrete production equipment 3 Mixer 13 Housing 13a Fiber supply port 14 Mesh 16 Exciter 18 Stirrer 19 Stirrer blade 20 Air nozzle 22 Dispersion rod member 23 Fiber input port S Fiber

Claims (3)

A fiber disperser that disperses the supplied fibers, including a quadrangular tubular housing into which the fibers are charged, and
A mesh provided in the housing for passing fibers, and a vibrating machine for vibrating the mesh.
A stirrer provided on the downstream side of the mesh to disperse the charged fibers by rotation of a stirrer blade, and
A fiber dispersion provided at four corners of the housing around the stirrer and provided with fibers that do not come into contact with the stirring blades and an air nozzle that blows away the fibers scattered by the stirrer. apparatus. The fiber dispersion device according to claim 1, further comprising a dispersion rod member arranged on the downstream side of the stirrer and further dispersing the fibers blown off by the air nozzle. The fiber disperser according to claim 1 or 2 and a mixer are provided, and the fibers dispersed by the fiber disperser are mixed into the concrete material or ready-mixed concrete of the rotating mixer to mix the fibers into concrete. A concrete manufacturing device characterized by being dispersed inside and mixed.

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