JP4356824B2 - Spraying material spraying method and material conveying method in spraying apparatus - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to, for example, a spraying method for spraying material and a material conveying method in a spraying apparatus.
[Prior art]
Conventionally, for example, when a spray material is transported in a spray device, a so-called dry material transport method or a wet material transport method has been employed.
[0002]
Here, as shown in FIG. 3, the dry transport material method is a method in which a solid material such as aggregate or cement and a powder material are kneaded with a mixer in a dry state and put into an apparatus. In this method, the material is transported through a transport line such as a hose, and the material and water are mixed and sprayed when the material is ejected from a nozzle at the tip of the transport line such as a hose.
[0003]
In addition, as shown in FIG. 4, the wet transfer material method is a semi-fluid form (mortar form) in which a solid material such as aggregate, a powder material such as cement and sufficient water are kneaded in advance. This semi-fluid material is injected into a spraying device and transported through a transport line such as a hose. The material is sprayed from a nozzle at the tip of the transport line such as a hose. It was to perform construction.
[Problems to be solved by the invention]
However, in the case of the dry transport method, when the material is ejected from the nozzle at the tip of the transport pipe, a dry material (a powder material such as cement or a solid material such as an aggregate) and a liquid such as water are used. Therefore, it is not easy to obtain a sufficiently uniform mixed state with respect to the state sprayed on the wall surface or the like.
[0004]
That is, it is difficult to obtain a molded body in an ideal porous state (a state in which the inside is uniform and sufficiently rough) in the sprayed material after spraying.
[0005]
In addition, in order to realize an even mixed state, a certain limitation is imposed on the efficiency of the spraying work, which causes the yield to deteriorate.
[0006]
Furthermore, if the mixing state of water and material is not so good from the nozzle, powder in a dry state is also ejected, so that dust is generated in the spraying work, which causes the work environment and work efficiency to deteriorate.
[0007]
On the other hand, in the case of a wet conveyance method, a solid material such as aggregate, a powder material such as cement, and a liquid such as water are kneaded in advance to obtain a material in a semi-fluid state (mortar state). When this semi-fluid material is conveyed using a conveyance pipe line, a solid material such as aggregate is separated from a semi-fluid powder material such as cement, or the semi-fluid material is separated from the inner surface of the conveyance line. In some cases, the material forming the shape adheres, and the conveyance pipeline is blocked.
[0008]
Therefore, it has been difficult to carry a material over a semi-fluid form by a hose or the like over a long distance.
[0009]
In the case of such a wet transfer method, in order to pressure-feed a semi-liquid material having a high viscosity through the transfer line, the transfer air pressure is increased to increase the transfer speed (about 1.5 times that of the dry type). There was a need.
[0010]
For this reason, if this method is used in spraying construction, the rebound rate of the material sprayed onto the wall surface etc. becomes as high as about 30%, and it is difficult to control the spraying device (air conveying device) and after spraying It was difficult to obtain a porous state in the molded sound absorbing material.
[0011]
Therefore, in the spraying construction of the sound absorbing material, it is not easy to obtain a molding material in an ideal porous state in the sound absorbing material after spraying in either case of dry transport or wet transport.
[0012]
For this reason, the construction efficiency (yield) does not increase in any of the transport methods, and the molded sound absorbing material is also concerned about the effect on the sound absorption characteristics such as the decrease in the sound absorption rate for a certain frequency band sound. It was done.
[0013]
Thus, the present invention was devised to solve the above-described conventional problems, and for example, it is possible to ensure a relatively long conveyance distance by forming the state of the spray material before conveyance into a constant state, etc. The purpose is to provide a material conveying method that can improve workability such as spraying work after transportation, and improve the sound absorption rate by improving the molded state of the sound absorbing material after spraying, etc. It is what.
[Means for Solving the Problems]
Thus, the present invention has a surface layer covered with a porcelain skin layer that does not allow water to permeate, has the strength necessary for spraying construction, and the surface of a solid material that has been reduced in weight by forming as foamed grains. After wetting with a liquid, the surface of the wet solid material is coated with a powder material to form a lump material, and the lump material group is put into a spraying device, and the transfer pipe is passed through a transfer line. It is conveyed by compressed air to the tip nozzle for spraying arranged in the road,
By adjusting the bulk material group formed as described above through the transport pipeline, the compressed air pressure adjustment of the compressed air for transporting the bulk material group to the tip nozzle for spraying is 0.3 to 2.0 kg. The pressure adjustment in the range of / cm ² can be performed to prevent the conveyance pipeline from being blocked,
In addition, the flow velocity of the spray material group at the time of being fired from the spray tip nozzle is detected by a flow rate sensor, and the detected flow velocity value is fed back to the pressure adjusting device and fired from the spray tip nozzle. A conveying method in which the flow rate of the material group is constantly in the range of 6 to 15 m / sec, and the pressure adjustment device can adjust the pressure within the range of 0.3 to 2.0 kg / cm ^2. Composed ,
Or
It has a water content and water absorption of 10% or less , has a surface layer covered with a porcelain skin layer that does not allow water to pass through, has strength necessary for spraying, and is reduced in weight by forming as foamed grains. water was added to the aggregate, in addition to cement after wet the entire surface of the aggregate surface of the aggregate to form a spray material bulk composed coated with cement, the該塊shaped spray material group It is put into the spraying device and conveyed by compressed air to the tip nozzle for spraying disposed in the conveying line through the conveying line,
By adjusting the bulk material group formed as described above through the transport pipeline, the compressed air pressure adjustment of the compressed air for transporting the bulk material group to the tip nozzle for spraying is 0.3 to 2.0 kg. The pressure adjustment in the range of / cm ² can be performed to prevent the conveyance pipeline from being blocked,
In addition, the flow velocity of the spray material group at the time of being fired from the spray tip nozzle is detected by a flow rate sensor, and the detected flow velocity value is fed back to the pressure adjusting device and fired from the spray tip nozzle. A conveying method in which the flow rate of the material group is constantly in the range of 6 to 15 m / sec, and the pressure adjustment device can adjust the pressure within the range of 0.3 to 2.0 kg / cm ^2. Composed ,
Or
It has a water content and water absorption of 10% or less , has a surface layer covered with a porcelain skin layer that does not allow water to pass through, has strength necessary for spraying, and is reduced in weight by forming as foamed grains. and to aggregate by the addition of water to form a spray material bulk in addition to cement the surface of the aggregate formed by covered with cement after wet the entire surface of the aggregate, the該塊shaped spray material group It is put into the spraying device and transported through the transport pipeline,
By adjusting the bulk material group formed as described above through the transport pipeline, the compressed air pressure adjustment of the compressed air for transporting the bulk material group to the tip nozzle for spraying is 0.3 to 2.0 kg. The pressure adjustment in the range of / cm ² can be performed to prevent the conveyance pipeline from being blocked,
In addition, the flow velocity of the spray material group at the time of being fired from the spray tip nozzle is detected by a flow rate sensor, and the detected flow velocity value is fed back to the pressure adjusting device and fired from the spray tip nozzle. The flow rate of the material group is constantly in the range of 6 to 15 m / sec, and the pressure adjustment device can perform pressure adjustment within the range of 0.3 to 2.0 kg / cm ² .
Wherein from spray tip nozzle, characterized in that it can fire spraying the spray material group by constantly flow rate 6 to 15 m / sec,
Or
100 to 500 parts by weight of water content and water absorption are 10% or less, have a surface layer covered with a porcelain skin layer that does not allow water to permeate, have strength necessary for spraying construction, and as foamed grains 10 to 60 parts by weight of water is added to the aggregate reduced in weight to wet the entire surface of the aggregate, and then 50 to 300 parts by weight of cement is added to cover the surface of each aggregate with cement. Forming a massive spraying material, and feeding the massive spraying material group into the spraying device and transporting it through a transport pipeline;
By adjusting the bulk material group formed as described above through the transport pipeline, the compressed air pressure adjustment of the compressed air for transporting the bulk material group to the tip nozzle for spraying is 0.3 to 2.0 kg. The pressure adjustment in the range of / cm ² can be performed to prevent the conveyance pipeline from being blocked,
In addition, the flow velocity of the spray material group at the time of being fired from the spray tip nozzle is detected by a flow rate sensor, and the detected flow velocity value is fed back to the pressure adjusting device and fired from the spray tip nozzle. The flow rate of the material group is constantly in the range of 6 to 15 m / sec, and the pressure adjustment device can perform pressure adjustment within the range of 0.3 to 2.0 kg / cm ² .
Wherein from spray tip nozzle, characterized in that it can fire spraying the spray material group by constantly flow rate 6 to 15 m / sec,
Or
It has a water content and water absorption of 10% or less , has a surface layer covered with a porcelain skin layer that does not allow water to pass through, has strength necessary for spraying, and is reduced in weight by forming as foamed grains. After adding water to the aggregate to wet the entire surface of the aggregate, cement and titanium dioxide are added to form a massive spray material in which the surface of each aggregate is coated with cement and titanium dioxide. , And the bulk of the spray material group is charged into the spray device and transported through the transport pipeline,
By adjusting the bulk material group formed as described above through the transport pipeline, the compressed air pressure adjustment of the compressed air for transporting the bulk material group to the tip nozzle for spraying is 0.3 to 2.0 kg. The pressure adjustment in the range of / cm ² can be performed to prevent the conveyance pipeline from being blocked,
In addition, the flow velocity of the spray material group at the time of being fired from the spray tip nozzle is detected by a flow rate sensor, and the detected flow velocity value is fed back to the pressure adjusting device and fired from the spray tip nozzle. The flow rate of the material group is constantly in the range of 6 to 15 m / sec, and the pressure adjustment device can perform pressure adjustment within the range of 0.3 to 2.0 kg / cm ² .
Wherein from spray tip nozzle, it is characterized in that the can fire spraying the spray material group with constantly flow rate 6 to 15 m / sec.
[Action]
In the present invention, the surface of a solid material such as an aggregate wetted with a liquid such as water is wrapped with a powder material such as cement and coated to form a massive material with the cement layer in a wet state. The material group is conveyed by compressed air through a conveyance pipe line such as a hose.
[0014]
As a result, it is possible to prevent clogging of the conveyance pipe line that has occurred when the solid material, the powder material, and the liquid are conveyed by air in a semi-fluid state, and it is possible to apply an extra conveyance pressure to the material. It can be avoided.
[0015]
Further, for example, in the case of using the sound absorbing material for spraying, water is added to the material transported to the tip nozzle of the transport pipe by the above-described method, and the spraying is performed after forming a semi-fluid spray material there.
[0016]
As a result, spraying can be performed without generating dust due to the dry powder, and the sprayed sound absorbing material can be used to form a molded article in an extremely ideal porous state.
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a spraying method for a finishing spray material and a material conveying method in a spraying apparatus according to the present invention will be described with reference to the drawings.
[0017]
First, as shown in the upper right part of FIG. 2, in this embodiment, the aggregate 10 as a solid material is put into a mixing and dispersing machine such as a mixer 20 and mixed with water 12 as a wetting liquid.
[0018]
Here, as the aggregate 10 used in the present embodiment, natural aggregates such as light aggregate pearlite, carbon hollow spheres, plastic balloons, glass balloons, silica balloons, and shirasu balloons, both natural and artificial, can be used. An aggregate 10 is given.
[0019]
The aggregate 10 used has a water content and a water absorption of 10% or less. In particular, these aggregates 10 are preferably light-weight aggregates that satisfy conditions such as having a surface layer that does not allow water 12 to permeate and having strength necessary for spraying.
[0020]
Furthermore, the compounding quantity of the aggregate 10 shall be 100-500 weight part.
[0021]
This is because the surface of the aggregate 10 is moistened with water 12 and coated with cement 14 to form a massive material, so that the amount of input with cement 14 and water 12 is balanced, and the amount input is 100. This is because if the amount is less than parts by weight, the desired sound absorbing effect cannot be obtained, and if the amount exceeds 500 parts by weight, the spraying workability deteriorates, and for example, the coating film obtained by spraying may become brittle.
[0022]
And as the lightweight aggregate 10 which has the above characteristics, what is called a high intensity | strength inorganic foaming particle is mentioned as an example. The inorganic foamed particles are lightweight aggregates of high strength and light weight with the surface covered with a porcelain skin layer, and have extremely high sound absorbing performance.
[0023]
Further, the water 12 is necessary for controlling the bonding state of the powder material to the solid material, and the water 12 is used in the spraying method for the spraying material 16 and the material conveying method in the spraying device of the present embodiment. It is also essential for setting and hardening the cement 14 by hydration reaction.
[0024]
In other words, in this embodiment, the water 12 is supplied in two stages: the wetting process of the spray material 16 before material transport and the spraying of the spray material 16 (supply to the spray nozzle 28 after transport). The Rukoto.
[0025]
Specifically, 10 to 60 parts by weight of water 12 is supplied to the material in the wetting process of the spray material 16 before material transport, and 30 to 100 parts by weight of water 12 is supplied to the material when the spray material 16 is sprayed. Will be.
[0026]
In addition, the supply amount of water 12 in the wet process is 10 to 60 parts by weight. If the amount is 10 parts by weight or less, the cement 14 does not sufficiently adhere to the surface of the aggregate 10 and 60 parts by weight or more. This is because the entire aggregate becomes a semi-fluid material instead of the aggregate material in which the individual aggregates 10 are coated with the cement 14.
[0027]
As described above, as shown in the middle left part of FIG. 1, the water 12 penetrates into the surface of the aggregate 10, the surface of the aggregate 10 becomes wet, and most of the water 12 charged in the mixer 20 is almost filled. The surface of the aggregate 10 is absorbed.
[0028]
And after this state is obtained, as shown in the middle part of FIG. 1 and FIG. 2, the cement 14 is put into the mixer 20 and mixed. Here, the cement 14 to be input is not particularly limited, and conventionally known ordinary Portland cement, early-strength Portland cement, moderately hot Portland cement, sulfate-resistant Portland cement, white Portland cement, mixed Portland cement. Etc. can be used.
[0029]
The blending amount of the cement 14 is indispensable from 50 to 300 parts by weight. This is because, as described above, in order to obtain the massive spraying material 16, the balance between the amount of the aggregate 10 and the water 12 is taken, and if it is less than 50 parts by weight, the sound absorbing material cannot be given sufficient strength. It is because there exists a possibility that the sound absorption effect may fall when it mixes exceeding 300 weight part.
[0030]
At this time (that is, when cement is added), various additives (admixture, water reducing agent, fiber reinforcing agent, etc.) can be blended as necessary. These compounding amounts are determined as appropriate.
[0031]
Various additives that can be used in this example will be described in detail later.
[0032]
With the above process, as shown in the lower left part of FIG. 1, the aggregate 10 becomes the core, and the entire surface is covered with the cement 14 through the moisture 12, thereby forming the massive spray material 16. Become.
[0033]
That is, the water 12 that has permeated the surface of the aggregate 10 functions as an adhesive that bonds the cement 14, and the entire surface of the aggregate 10 is covered with the cement 14.
[0034]
Here, the layer of cement 14 covering the aggregate 10 contains a lot of water 12, and is in a wet state as a whole.
[0035]
Therefore, as shown in the lower part of FIG. 2, this massive spraying material 16 is introduced into the air transfer device 22 in the spraying device, and air is transferred via a transfer line 26 such as a hose. However, unlike the conventional wet transfer method, it is possible to prevent the cement layer and the aggregate from being separated, and to avoid material adhesion to the inner surface of the transfer line 26.
[0036]
Therefore, there is no possibility that the conveyance pipe line 26 will be blocked by the viscous semi-fluid, and the conveyance distance can be long.
[0037]
The spray material 16 passes through the transport pipe 26 and is transported by being pushed by compressed air to the tip of a nozzle 28 arranged to spray the spray material 16 onto a desired construction site.
[0038]
In this embodiment, the compressed air for material conveyance is compressed and formed by the air compressor 24.
[0039]
Here, the pressure of the air for conveyance (pressure air pressure) sent from the air compressor 24 to the conveyance pipe line 26 in the air conveyance device 22 is adjusted to be a value within 0.3 to 2.0 kg / cm ² . ing.
[0040]
This can not sufficiently convey the sprayed material 16 within the conveying conduit 26 is less than the pumping pressure is 0.3 kg / cm ^2, spraying the material bulk pumping air pressure 2.0 kg / cm ² is greater than the conveyed This is because the cement 14 coated from the 16 coating layers may be separated.
[0041]
If the compressed air pressure of the compressed air is used, the flow velocity at which the spray material 16 is sprayed from the nozzle 28 can be set to 6 to 15 m / sec, which is good for spraying.
[0042]
The pressure air pressure is changed within the above range according to the transport distance, transport height, transport amount, and transport pipe diameter of the spray material 16, so that the nozzle 28 can be used under any transport conditions. The flow velocity at which the spray material 16 is sprayed and fired can be controlled to 6 to 15 m / sec, which is good for spraying.
[0043]
Here, as understood from FIG. 1, the flow velocity of the spray material 16 fired from the nozzle 28 is detected by the flow velocity sensor 36, and this flow velocity is constantly in the range of 6 to 15 m / sec which is good for spraying construction. Can be.
[0044]
In other words, the flow velocity detected by the flow velocity sensor 36 is fed back to the pressure adjusting device 38, and the pressure air pressure is adjusted by the pressure adjusting device 38 according to the detected flow velocity.
[0045]
Therefore, for example, when the detected flow velocity is slower than a value within the range of 6 to 15 m / sec, the pressure adjusting device 38 adjusts the pressure air pressure so that the flow velocity becomes faster.
[0046]
The configuration of the flow rate sensor 38 is not limited at all, but an optical sensor is generally used. Further, the configuration of the pressure adjusting device 38 is not limited at all, and may be configured by an air adjusting valve or the like.
[0047]
Here, in the conventional wet transfer method, the pressure air pressure is higher than 2.0 kg / cm ² in order to prevent the semi-fluid transfer material from adhering to the inner surface of the transfer pipe 26 and the blockage of the transfer pipe 26. There were many things that had to be set.
[0048]
However, for this reason, the flow velocity at which the spray material 16 is sprayed and fired from the nozzle 28 becomes larger than 6 to 15 m / sec, and the rebound rate of the spray material (the material sprayed from the spray target such as the soundproof wall bounces at the time of spraying). Ratio) was about 30%.
[0049]
However, according to the conveying method of the present invention, the pressure air pressure is 2.0 kg / cm ² or less, and the flow rate at which the spray material 16 is sprayed from the nozzle 28 can be within 6 to 15 m / sec, so the rebound rate is 10%. This can be reduced to a certain extent.
[0050]
Here, the massive spray material 16 transported to the nozzle 28 at the tip of the transport pipe 26 such as a hose is sprayed into the air from the nozzle 28 and sprayed onto the spray surface 34 at a desired construction site such as a soundproof wall. .
[0051]
Further, at the time of the spraying, 30 to 100 parts by weight of water 12 is further conveyed from the water pump 30 and additionally supplied to the spraying material 16.
[0052]
As described above, the water 12 is essential for setting and hardening the cement 14 by the hydration reaction, and the final blending amount (blending amount immediately after spraying) is 50 to 130 parts by weight.
[0053]
If the amount is less than 50 parts by weight, the cement 14 may be insufficiently cured. If the amount exceeds 130 parts by weight, the curing will not only take time, but the coating film after spraying will be fluid. This is because there is a risk that the film will not be uniformly cured.
[0054]
In this embodiment, a two-head nozzle having two of the sound absorbing material spray nozzle and the additional water spray nozzle may be used.
[0055]
Thus, it is possible to easily construct a finishing sound-absorbing material in an ideal porous state, which is difficult with the conventional method.
[0056]
That is, at the time of spraying, each material is uniformly dispersed and mixed in a well-balanced manner, so that an ideal mixed state semi-fluid material can be obtained. A sound absorbing material can be configured.
[0057]
Further, in the transport method and spraying method according to the present invention, the dried aggregate 10 and cement 14 are not sprayed from the nozzle 28 as in the conventional dry transport method, and therefore, when spraying with a powder material such as cement 14. No dust is generated, and there is no need to worry about a decrease in work efficiency due to dust.
[0058]
Therefore, according to the method of the present invention, it is possible to obtain high construction efficiency (yield) as compared with the conventional transport methods and spraying construction methods.
[0059]
Furthermore, since the sound absorbing material molded by the method of the present invention is in a very porous state, it has sufficient sound absorbing characteristics over a wide frequency band, and sound (noise) in a certain frequency band as in the conventional method. Concern about the possibility that the sound absorption rate will be reduced.
[0060]
Moreover, curing may be performed by masking work as necessary in advance. Although it depends on the construction conditions, it will condense and harden in about 20-30 hours after the completion of spraying construction. When a quick set is used in combination, it quickly sets in a few minutes to a few dozen minutes.
[0061]
Since the sound absorbing layer obtained by using the rapid setting agent maintains a good porous structure, a better sound absorbing effect can be obtained as compared with the case of not using them together.
[0062]
The aggregate 10, cement 14, water 12, and various additives (powder material or liquid) shown above are examples of solid materials, powder materials, and liquids used in the method of the present invention. The invention is a technical idea characterized in that the surface of a wet solid material is coated with a powder material to form a massive material, and this is conveyed by compressed air.
[0063]
Therefore, materials used in the method of the present invention are not limited to these specific examples.
[0064]
For example, a solid material and a powder material are pumped as a semi-fluid material by a conveyance pipe, retort food production process, production of base-like confectionery, asphalt (asphalt concrete) for road construction, manure treatment, sealing It can also be applied to the transport process of materials such as agents.
[0065]
Next, various additives (titanium 15, admixture, water reducing agent, thickener, foaming agent, quick setting agent, etc.) added as a powder material or liquid will be described.
[0066]
In this embodiment, in order to add an action of absorbing NOx (nitrogen oxide), for example, titanium dioxide titanium 15 having an anatase type crystal structure is used. Here, titanium dioxide has an anatase type and a rutile type depending on its crystal structure. The rutile type has a relatively stable crystal structure and is generally used as a white colored pigment. On the other hand, the anatase type is an unstable crystal structure that shifts to the rutile type when heated, but recent studies have shown that it has a photocatalytic action.
[0067]
That is, it is considered that anatase-type titanium dioxide generates active oxygen on the surface by receiving light, which is combined with and absorbed by NOx (nitrogen oxide) in the air to exhibit an air purification action.
[0068]
Anatase type titanium dioxide needs to contain 2 to 100 parts by weight. If it is less than 2 parts by weight, the NOx (nitrogen oxide) absorption action is not sufficient, and even if it exceeds 100 parts by weight, an air purification action proportional to the amount of addition cannot be obtained, and this is rather disadvantageous in terms of cost. Become.
[0069]
The aggregate 10 described above is preferably used by coating titanium dioxide. It was confirmed that when a lightweight aggregate was coated with a titanium dioxide coating, it had a higher NOx removal effect than a conventional spray-type sound absorbing material.
[0070]
The titanium dioxide coated on the lightweight aggregate may be titanium dioxide added directly to the liquid material for the spray type sound absorbing material.
[0071]
Furthermore, it is also possible to use an organic admixture as a part of the admixture in the spray type sound absorbing material. Examples of the organic admixture include resin emulsions such as all acrylic resin, acrylic-styrene copolymer resin, and styrene-butadiene copolymer resin. Particularly preferably, an acrylic resin emulsion having a polar group such as a carboxyl group at the terminal is recommended. Other admixtures that can be blended as necessary include plaster suitable for controlling the setting, and various fillers for reinforcing sound absorbing materials, such as chemical fibers and glass such as polyester, polyethylene, vinylon, rayon, and nylon. Examples thereof include inorganic fibers such as fibers and rock wool, various types of cinnabar, pigments such as barium sulfate, calcium carbonate, and clay, and flake fillers such as mica. In addition, various additives such as a water reducing agent and a thickening agent for securing and improving the workability and performance after curing of the spray type sound absorbing material can be blended as necessary. These compounding amounts are determined as appropriate.
[0072]
Furthermore, a foaming agent may be added for the purpose of facilitating the spraying operation and improving the sound absorption performance. In general, the foaming agent can be appropriately selected from an anionic surfactant, animal protein and the like. N-acyl amino acids and salts thereof, alkyl ether carboxylic acids, carboxylates such as acylated peptides, alkyl benzene sulfonates, sulfonates such as alkyl naphthalene sulfonates, sulfate esters, phosphate ester salts, glues, etc. It can be illustrated. The foaming agent is added by (1) a method in which the foaming agent is diluted to an appropriate concentration and added directly when mixing the spray type sound absorbing material, and (2) the foaming agent is passed through a foaming device to generate bubbles. A method of mixing the bubbles with the spray-type sound absorbing material after kneading can be exemplified.
[0073]
In any method, the volume ratio of bubbles in the sound-absorbing material before spraying is adjusted to 20 to 80%. This is because if the bubbles are less than 20%, the sound absorbing effect cannot be improved, and if it exceeds 80%, the sound absorbing material may be reduced in strength and durability may be lowered.
[0074]
In addition, bubbles may disappear as the cement hardens after spraying, but voids remain in the sound absorbing material sprayed after the disappearance. It is preferable that the porosity in the sound absorbing material is 10 to 50%. This is because if the amount is less than 10%, the sound absorption effect cannot be improved, and if it exceeds 50%, the strength of the sound-absorbing material is lowered and the durability may be lowered.
[0075]
When constructing a spray type sound absorbing material, if the construction location is sprayed on the top surface such as the tunnel inner surface, there is a risk that problems such as dripping or rebounding may occur due to its own weight after spraying construction, In addition, depending on the environment and construction conditions of the construction site, there is a case where short-time condensation, so-called rapid setting is required. In such a case, it is possible to use a quick setting agent in the spraying method. Examples of the quick setting agent include calcium aluminates such as calcium chloride, aluminum hydroxide, sodium carbonate and sodium hydroxide, and inorganic substances such as calcined alumite and water glass. Some organic substances such as triethanolamine and glycerin can be used as a quick setting agent. It is preferable that the quick setting agent is injected in a substantially same direction from a similar nozzle immediately after the sound absorbing material is injected from the spray nozzle, and is mixed in the air until reaching the sound absorbing material construction surface from the nozzle. In addition, a three-headed nozzle having three of a so-called sound absorbing material injection nozzle, a water injection nozzle, and a quick setting agent injection nozzle can also be exemplified.
【The invention's effect】
Thus, according to the material conveying method of the present invention, for example, the finishing spraying method and the material conveying method in the spraying device, the sufficient conveying distance can be obtained by controlling the state of the material before conveyance to a constant state. , Improving workability such as spraying work after transport, and improving the sound absorption rate by improving the molded state (porous state) of the sound absorbing material after transport spraying, etc. .
[Brief description of the drawings]
FIG. 1 is a conceptual explanatory diagram of the present invention.
FIG. 2 is an explanatory diagram of an embodiment of the present invention.
FIG. 3 is an explanatory diagram of a conventional technique (dry transport method).
FIG. 4 is an explanatory diagram of a conventional technique (wet transfer method).
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Aggregate 12 Water 14 Cement 15 Titanium 16 Spraying material 20 Mixer 22 Air conveyance machine 24 Air compressor 26 Conveyance line 28 Nozzle 30 Water pump 34 Spraying surface 36 Flow rate sensor 38 Pressure control apparatus

Claims (5)

After wetting the surface of a solid material that has a surface layer covered with a porcelain skin layer that does not allow water permeation and that has the strength necessary for spraying and that has been reduced in weight by forming as foamed grains. The surface of the wet solid material is coated with a powder material to form a lump material, and the lump material group is put into a spraying device and disposed on the transfer line through the transfer line. It is conveyed by compressed air to the tip nozzle for use,
By adjusting the bulk material group formed as described above through the transport pipeline, the compressed air pressure adjustment of the compressed air for transporting the bulk material group to the tip nozzle for spraying is 0.3 to 2.0 kg. The pressure adjustment in the range of / cm ² can be performed to prevent the conveyance pipeline from being blocked,
In addition, the flow velocity of the spray material group at the time of being fired from the spray tip nozzle is detected by a flow rate sensor, and the detected flow velocity value is fed back to the pressure adjusting device and fired from the spray tip nozzle. A conveying method in which the flow rate of the material group is constantly in the range of 6 to 15 m / sec, and the pressure adjustment device can adjust the pressure within the range of 0.3 to 2.0 kg / cm ^2. Configured,
A method for conveying a solid material and a powder material. It has a water content and water absorption of 10% or less , has a surface layer covered with a porcelain skin layer that does not allow water to pass through, has strength necessary for spraying, and is reduced in weight by forming as foamed grains. water was added to the aggregate, in addition to cement after wet the entire surface of the aggregate surface of the aggregate to form a spray material bulk composed coated with cement, the該塊shaped spray material group It is put into the spraying device and conveyed by compressed air to the tip nozzle for spraying disposed in the conveying line through the conveying line,
By adjusting the bulk material group formed as described above through the transport pipeline, the compressed air pressure adjustment of the compressed air for transporting the bulk material group to the tip nozzle for spraying is 0.3 to 2.0 kg. The pressure adjustment in the range of / cm ² can be performed to prevent the conveyance pipeline from being blocked,
In addition, the flow velocity of the spray material group at the time of being fired from the spray tip nozzle is detected by a flow rate sensor, and the detected flow velocity value is fed back to the pressure adjusting device and fired from the spray tip nozzle. A conveying method in which the flow rate of the material group is constantly in the range of 6 to 15 m / sec, and the pressure adjustment device can adjust the pressure within the range of 0.3 to 2.0 kg / cm ^2. Configured,
The material conveying method in the spraying apparatus of the spraying material characterized by the above-mentioned. It has a water content and water absorption of 10% or less , has a surface layer covered with a porcelain skin layer that does not allow water to pass through, has strength necessary for spraying, and is reduced in weight by forming as foamed grains. and to aggregate by the addition of water to form a spray material bulk in addition to cement the surface of the aggregate formed by covered with cement after wet the entire surface of the aggregate, the該塊shaped spray material group It is put into the spraying device and transported through the transport pipeline,
By adjusting the bulk material group formed as described above through the transport pipeline, the compressed air pressure adjustment of the compressed air for transporting the bulk material group to the tip nozzle for spraying is 0.3 to 2.0 kg. The pressure adjustment in the range of / cm ² can be performed to prevent the conveyance pipeline from being blocked,
In addition, the flow velocity of the spray material group at the time of being fired from the spray tip nozzle is detected by a flow rate sensor, and the detected flow velocity value is fed back to the pressure adjusting device and fired from the spray tip nozzle. The flow rate of the material group is constantly in the range of 6 to 15 m / sec, and the pressure adjustment device can perform pressure adjustment within the range of 0.3 to 2.0 kg / cm ² .
Wherein from spray tip nozzle, it can fire spraying the spray material group by constantly flow rate 6 to 15 m / sec,
A spraying method for spraying material, characterized in that. 100 to 500 parts by weight of water content and water absorption are 10% or less, have a surface layer covered with a porcelain skin layer that does not allow water to permeate, have strength necessary for spraying construction, and as foamed grains 10 to 60 parts by weight of water is added to the aggregate reduced in weight to wet the entire surface of the aggregate, and then 50 to 300 parts by weight of cement is added to cover the surface of each aggregate with cement. Forming a massive spraying material, and feeding the massive spraying material group into the spraying device and transporting it through a transport pipeline;
By adjusting the bulk material group formed as described above through the transport pipeline, the compressed air pressure adjustment of the compressed air for transporting the bulk material group to the tip nozzle for spraying is 0.3 to 2.0 kg. The pressure adjustment in the range of / cm ² can be performed to prevent the conveyance pipeline from being blocked,
In addition, the flow velocity of the spray material group at the time of being fired from the spray tip nozzle is detected by a flow rate sensor, and the detected flow velocity value is fed back to the pressure adjusting device and fired from the spray tip nozzle. The flow rate of the material group is constantly in the range of 6 to 15 m / sec, and the pressure adjustment device can perform pressure adjustment within the range of 0.3 to 2.0 kg / cm ² .
Wherein from spray tip nozzle, it can fire spraying the spray material group by constantly flow rate 6 to 15 m / sec,
A spraying method for spraying material, characterized in that. It has a water content and water absorption of 10% or less , has a surface layer covered with a porcelain skin layer that does not allow water to pass through, has strength necessary for spraying, and is reduced in weight by forming as foamed grains. After adding water to the aggregate to wet the entire surface of the aggregate, cement and titanium dioxide are added to form a massive spray material in which the surface of each aggregate is coated with cement and titanium dioxide. , And the bulk of the spray material group is charged into the spray device and transported through the transport pipeline,
By adjusting the bulk material group formed as described above through the transport pipeline, the compressed air pressure adjustment of the compressed air for transporting the bulk material group to the tip nozzle for spraying is 0.3 to 2.0 kg. The pressure adjustment in the range of / cm ² can be performed to prevent the conveyance pipeline from being blocked,
In addition, the flow velocity of the spray material group at the time of being fired from the spray tip nozzle is detected by a flow rate sensor, and the detected flow velocity value is fed back to the pressure adjusting device and fired from the spray tip nozzle. The flow rate of the material group is constantly in the range of 6 to 15 m / sec, and the pressure adjustment device can perform pressure adjustment within the range of 0.3 to 2.0 kg / cm ² .
Wherein from spray tip nozzle, it can fire spraying the spray material group by constantly flow rate 6 to 15 m / sec,
A spraying method for spraying material, characterized in that.

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