JPS6023229B2 - Spraying method - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to the creation of a spraying method, which enables smooth execution of spraying with a high bone density ratio, achieves delicate construction with a small amount of air inclusion, and is easy to operate. It is an object of the present invention to provide an advantageous spraying method that is easy, eliminates sagging, and can accurately form economically stable spraying construction.

In cases where tunnels are excavated or slopes of natural ground are scraped to form steep slopes, spraying has traditionally been used to prevent the collapse of rock and strata, or to form walls. Are known.

In other words, this spraying method does not require formwork or anything similar and is applied immediately to the construction surface, so it is possible to greatly simplify and shorten the construction process and construction period. It has the great advantage of eliminating the need for consumable materials and achieving the desired construction economically and efficiently, especially since it is now possible to spray concrete with coarse aggregate. It is gradually becoming popular. In addition, by using resin-based polymers such as resin or asphalt or other organic binders as binders in such spraying construction, there is a tendency for cracks to occur due to tension or bending, and there is a tendency for cracks to occur due to tension or bending, such as acids and other chemicals, as in cement concrete. It is possible to improve essential deficiencies such as low resistance to components, and some practice has been achieved with respect to spraying with resin-based polymers. However, the conventional method of spraying using an organic binder such as a resin-based polymer is to mix the organic binder and aggregate such as Tsumugi-kotsumura or coarse aggregate in advance. The mixed material is pumped and high-pressure air is used to force-feed it to the target construction location, and the spraying is carried out using a nozzle.In the case of such a conventional method, fluid pressure-feeding is carried out in hoses and other conduits. Since it is necessary to adjust the condition as possible, it is necessary to prepare a slurry in which a considerable amount of organic binder such as a resin or asphalt type is mixed, whether it is a solvent type, an emulsion type, or a curing agent type. Specifically, in the case of mortar using only fine aggregate, the resin polymer to aggregate weight ratio is 1:2 or 1:2.5 or less, and coarse bone Even in the case of concrete containing aggregates, the ratio is about 1:3 or less, and if the aggregate content is larger than that, it becomes extremely difficult to pump, or special and abnormal high pressure pumping conditions are required. This inevitably involves various disadvantages and deficiencies in terms of equipment and operation. Moreover, when the resin-based polymer is blended in a rich manner in this manner, since the polymer is a Newtonian fluid or a non-Newtonian fluid, there is significant sagging on the spraying surface and stable spraying cannot be achieved. That is, as mentioned above, there are definite disadvantages in that the polymer content must be rich and that losses due to dripping on the sprayed surface are unavoidable, which inevitably increases the cost. are doing. In addition, resin-based polymers such as those mentioned above have a considerable viscosity, and when aggregates such as those mentioned above are mixed and kneaded with them, a certain amount of air bubbles may be present in the slurry. Since the kneaded material containing air bubbles is then pumped as it is and sprayed onto the wall surface, the rate of air inclusion in the sprayed layer is high, and therefore it is not necessarily possible to achieve a delicate and strong construction. with disadvantages such as. The present invention was devised through repeated research to eliminate the disadvantages and shortcomings of the conventional methods as described above. In carrying out the spraying process using a unique method, we ensured the ability to be pumped through a smooth pipeline, while dramatically increasing the blending ratio of ribs, and reducing the shear stress of the trout in the sprayed layer. We succeeded in obtaining a method that achieves highly preferable construction, enables stable construction with little air inclusion, and has excellent operability, including equipment cleaning.

That is, in the present invention, resin-based polymers such as epoxy resins, polyester resins, urethane resins, furan resins, phenol resins, and other resins, or asphaltic resins such as asphalt, epoxy asphalt, rubber asphalt, and polysulfide asphalt are used. These resin-based polymers themselves have been known for a long time; for example, the former epoxy resin binder is commercially available with a viscosity of 100 to 700 centipoise (CM) at room temperature, and asphalt Various asphalt materials such as those mentioned above are generally commercially available, and these materials can be mixed into concrete or mortar to increase its strength, or to repair cracks that have occurred in existing concrete. Although it is used for various purposes, in the present invention, when using this material as a binder component in the above-mentioned spray layer, this material and aggregates are separately pressure-fed, and the By selecting the timing of addition of aggregates during the pumping process, both pumping and spraying were carried out smoothly, and the properties of the sprayed layer were sufficiently ensured. By using a resin-based polymer as described above, for example, by using the conventional shotcrete method and using cement as an inorganic binder, water is added, and this added water and cement powder, pongee aggregate, etc. There is no longer a need to thoroughly mix the aggregates with the aggregates, and the polymers are fed under dry conditions as a Newtonian fluid and the aggregates have excellent dispersibility. It is possible to effectively avoid the enormous pressure loss caused by pressure-feeding. As mentioned above, the resin-based polymer as mentioned above has a viscosity of about 100 to 70 PS, for example, by selecting one with a viscosity of about 30 PS. It is possible to use pumps or other pumping mechanisms to carry out pressure feeding relatively freely and to find a sufficient pumping distance. On the other hand, the aggregates to be mixed in this include fine aggregates such as sand, dregs aggregates such as gravel, or fibrous aggregates such as short metal fibers. It is clear that a considerably large conveyance distance can be precisely achieved by employing, for example, high-pressure air under substantially dry conditions that do not bond with the resin-based polymer. Furthermore, if fine powder materials such as cement are not used, there will be no room for dust to be generated either in the transportation line for any of the materials mentioned above or during spraying, which will impair the work environment. Never. The liquid or slurry-like liquid flow component mainly composed of an organic binder such as a resin-based polymer and the powdery solid component such as bone particles, which are conveyed separately as described above, are dispersed and mixed in the vicinity of the spray nozzle. be done.

A general pump mechanism is sufficient for pressurizing the liquid flow.
Even when using a screw pump or other pump that continuously pumps a fixed amount, or an intermittent piston system, continuous pressure feeding can be achieved without substantially impeding intermittent pressure feeding by using an air chamber or the like to utilize the pressure inside the air chamber. It is possible to make it a condition. On the other hand, the conveying power of high-pressure air is used for powdery solids such as aggregates, and even if there is coarse aggregate, if a certain amount of high-pressure air is used, it can be properly pumped through pipes such as hoses. By dispersing and adding the liquid fluid component to such a powdery solid component, the two are mixed. In particular, with regard to the proportion of this addition and mixing, generally the liquid flow fraction by volume is 1
In the case of a mortar method in which only Tsumugi Mura is added, 0.5 parts or more of granular solid content per 1 part of the liquid fluid content is added in the case of a concrete method in which coarse aggregate is also mixed. Adding 3 parts or more of granular solid content, which is expressed in terms of weight ratio, except when using lightweight aggregates such as calcined expanded materials, which are particularly lightweight, or similar materials. In the case of using the above mortar method, the powdery solid content is 4 parts for 1 part of the liquid fluid content.
1 part or more, and in the case of a concrete method, the powdery solid content should be 5 parts or more for every 1 part liquid fluid content. Adding and mixing such a large amount of aggregate cannot be carried out using the conventional premix method due to the considerable difficulty in equipment and operation, but in the present invention, the liquid flow The components are appropriately dispersed by being sequentially focused into the flow of powdery solids using a high-pressure air flow (in this case, it is possible to use an appropriate nozzle), and the components are smoothly added and mixed. Become. However, in the case of the method of the present invention in which a large amount of granular solid content is added and mixed as described above, the particles of the granular solid content, which are covered with the liquid flow content, are directly bonded to each other. It is sprayed as a so-called funicular shape.

However, such a relationship is as shown in Fig. 11, and the situation is such that the amount of liquid flow is considerably large, for example, a state where the volume ratio of the liquid flow to the liquid of bone mounds is 30% or less. The fluidity and shear stress of the mixture are mostly controlled by the viscosity of the liquid component, but as the amount of aggregate added increases, the shear stress gradually increases and accelerates. To increase. In the conventional method, if the solid content is 20 to 30%, it is just a layer of paint, and if you want to obtain the thickness of a sprayed layer, the spraying pressure must be extremely high, and therefore the liquid The weight ratio of the aggregate to the aggregate must be around 40%, or at most 50%, but even with this method, since the liquid content is quite large, a slurry-like barrel cannot be avoided. Therefore, with the conventional method using the premix method, there is a limit to the thickness of the sprayed layer at one time. Since the spraying construction has to be carried out, the advantage of the spraying method, which does not require special formwork, is substantially reduced.In the present invention, as described above, a large amount of aggregate is Since it is possible to perform spraying with addition and mixing of It is clear that a sprayed layer is obtained in which particles of the aggregate sprinkled with the liquid or liquid flow are bonded to each other, and it is possible to significantly increase the deep shear stress. Even though there may be some changes depending on the properties of the material, when using Tsumugi-koshimura such as river sand or similar aggregates, the ratio of aggregate to resin was 60 to 70%. In this case, the shear stress in the sprayed layer is at its highest, and the value is sharply increased, for example, at least 5 times or more than in the case of 30%.
As shown in Figure 11, sea bream sometimes show large shear stress values of more than one needle sound, and if the sea bream shear stress in the sprayed layer is increased in this way, sea bream will no longer produce any sagging. Even if the layer is thick, it can be applied smoothly with one spraying. That is, in the present invention, by mixing as described above, it is possible to make the scale shear stress of the liquid flow thicker than the product of the sprayed layer thickness and its specific gravity, and then spray the mixture in a state where the scale shear stress of the liquid flow is greater than the product of the sprayed layer thickness and its specific gravity. Even if the layer is thicker than that, it can be sprayed in a desirable state with almost no drips in one application. In addition, in the above-mentioned mixing, one part of the solid content,
In particular, when using fly ash pigments, other powders, or pongee grains similar thereto, it is preferable to add this material to the liquid flow component for adjustment.

That is, such powders can be prevented from scattering and can be mixed appropriately. In addition, resin-based polymers that exhibit favorable fluidity during the pumping process by forming a favorable mixing state between the resin-based polymers and aggregates as described above, in which the particles of the aggregates are bonded to each other. However, the fluidity of the sprayed construction surface is significantly reduced, and since aggregates are mixed into such a resin-based polymer, it is difficult to perform an impact hammering action using the mass of the aggregates. Not only is it applied continuously to the sprayed surface and there is little rebound or peeling off from the sprayed surface, but it is also coated in a layer with high shear stress and does not cause dripping or the like. Moreover, effective spraying construction can be achieved with little air inclusion.

Generally, the amount of high-pressure air required for spraying is significantly reduced compared to when using the conventional cements mentioned above or when spraying a premix of resin polymer and aggregate. This is especially important when construction is carried out inside a tunnel, for example, since conventional spraying requires a large amount of high-pressure air to pump the fresh mortar or fresh concrete. Of course, there was a certain amount of air leakage in the middle of the conveyance pipeline, which created a typhoon-like atmosphere inside the tunnel and created work conditions where dust was thrown up everywhere. tendency can be greatly reduced. In addition, it is clear that a sufficient pumping distance can be found without the need for large pumping pressures when the aggregates and the resin-based polymer are mixed in advance and then pumped, and the pipes are generally of small diameter. Therefore, it can be simple and compact in terms of equipment and operation. In addition, when cleaning after spraying, it is generally only necessary to clean a very short area from the vicinity of the nozzle, so even if the maximum pumping distance is sought, it is difficult to manage equipment after spraying. It also becomes significantly easier. Embodiments using resin-based polymers such as resin or asphalt, and other organic binders are generally solvent-type, emulsion-type, and curing agent-type. The fluidity may be increased by using the same method, or they may be used in combination as appropriate.

Regarding the aggregate content, for the above-mentioned solvent type and curing agent type, it is used in a dry state, and for emulsion type, it is sufficient to use a moderately moist aggregate. This is advantageous when using sand that is used in large quantities and is difficult to dry. Some of the devices for carrying out the method of the present invention are shown in the attached drawings, and FIG. The tank 2 for adding organic binder and the tank 3 for adding organic binder each have a valve 4.
Furthermore, high-pressure air pipes 5 for applying back pressure are connected to these tanks 2 and 3, respectively. It is planned to be constructed towards.

That is, the amount added from each tank 2, 3 is determined by the relationship and back pressure of the valve 4, but in reality, the pressurizing force from the high pressure air pipe 5 prevents blowing up when the valve 4 is opened. By keeping the air pressure approximately the same as that of the blowing pipe 1 (for example, by applying approximately the same air pressure as the blowing pipe 1), the opening degree of each valve 4 is determined, and thereby a preferable addition relationship is obtained, and the amount of high-pressure air used is also relatively small. A small amount will suffice.
As shown in Fig. 1, in the case where sealed tanks 2 and 3 are used, a solvent-type resin polymer is particularly suitable.In other words, the solvent used in such a case should be one with excellent vapor dissipation properties. , its diffusion can be sufficiently prevented at least during the pressure-feeding process within the pipeline, and it can be handled while maintaining favorable fluidity. When using a resinous polymer like the one mentioned above, it is often preferable to use a two-component type, that is, a curing agent type, and an example of a device suitable for this purpose is shown in Figure 2. is shown.

That is, in place of the tank 3 in the one shown in FIG. Therefore, each tank 3a, 3b is provided with a valve 4 to appropriately select the amount of addition, and each of the valves 4, including the aggregate tank, is equipped with a concentration indicating mechanism. 8 is provided, and the other structural relationships are the same as those in FIG. In this way, by preparing the main agent and hardening agent separately according to the hardening agent type, curing and binding will not proceed unless the two are mixed, so it can be used in nozzle parts where cleaning and other handling are extremely limited. It becomes easier to concentrate and focus. A modification of the one shown in FIG. 2 is separately shown in FIG.

That is, only the aggregate addition tank 2 is provided for the spray pipe 1, and a polymer addition pipe 9 is separately provided, and the same tanks 3a and 3b as described above are provided for the pipe 9. High pressure air is also supplied to the pipe line 9. An example of an apparatus for adding and spraying a plurality of aggregates such as pongee aggregate and phase aggregate is shown in FIG.

A mixing chamber 11 is provided in the lidded spray pipe 1, and the mixing chamber 1
1 is provided with a hopper 13 above through a sealable bag inlet 12 (for example, a slide damper is provided on the side of the mixing chamber 1), and a hopper 13 is provided with a cutting mechanism 14 for each aggregate. Hoppers 15 and 16 are arranged above, respectively. The addition of the polymer to the spray pipe 1 is carried out through a base material hopper 19 having pumps 17 and 18.
and curing agent hopper 20, etc., as shown in the figure. In the structure shown in FIG. 4, the specific structure of the hover addition section A for the spray pipe 1 may be as shown in FIGS. 5 and 6.

That is, in the system shown in FIG. 5, the addition pipes 21 and 21a from the hoppers 19 and 20 are connected to a separately provided high-pressure air pipe 22, and the air is ejected in a dispersed and mixed state in this pipe 22 before being sprayed. In the case of the one shown in FIG. 6, the addition pipes 21 and 21a are connected to a mixing mechanism 23 to mix the main agent and the curing agent discharged. The agent is mixed once and then fed into the nozzle 6 portion of the spray pipe 1 to be mixed and added to the aggregate. Some of the embodiments carried out by the present inventors using the above-mentioned apparatus in accordance with the proposed invention will be described below. Example 1 Using an apparatus as shown in FIG. 1, an epoxy base resin with a viscosity of 55 PS at a temperature of 25:00 and a curing agent with a viscosity of 17 PS at that temperature were mixed into 2: A mixture of 0.1 and 1.0% is pumped from the polymer tank 3, while
．． Standard sand specified in JISR 5201 produced in Toyoura, Yamaguchi Prefecture of 6 sails was stored in the aggregate tank 2, and the pressure in the spray pipe 1 was 2k9/6 6s of sand per 1 part of polymer was pumped into the air of Sakaki. It was applied to the spray surface 10 from the nozzle 6.

That is, although the polymer blended as above was a PS liquid fluid in the tank 3, when it was mixed with aggregate sand in the above proportion and sprayed, there was virtually no rebound. First, the scale shearing force immediately after spraying is approximately 2 mm/ground, and even when sprayed to a thickness of 5 mm with one spray, no formation of any spots can be observed, so that appropriate spraying work can be carried out. was completed.

In addition, the strength after spraying is 421 in compression after 2 hours.
k9/ground, bending is 183kg/, compression is 76 after 3 days
It was confirmed that the compressive strength was 879 k9/m and the bending strength was 365 k9/m after 7 days. After 7 days, the compressive strength was 832k9/base, and the bending strength was 361k9/base, when the epoxy polymer and Honemura sand were mixed together and press-molded into the mold using the same composition as above.
It was confirmed that the spraying method achieved a strength equal to or greater than that obtained by cross-wire molding, and the advantages of the present invention were fully understood. As shown in Figs. 8 and 9, the specimen for obtaining the above-mentioned soul breaking force, etc. is made by superimposing two frames 31, 31 each having an inner hole 37 and setting the spraying surface 10'. The test piece obtained by spraying inside the inner hole 37 is fixed to a pedestal 401 as shown in FIG.
The measurement was carried out using a method in which a hook 33 was hung, the strip 34 was suspended via a pulley 35, and a weight 36 was applied. Example 2 BoIJ ester resin was used as the main resin, and 10% xylene solvent was added to this resin to give a viscosity of 1 at a temperature of 25 oo.
8 was made into PS, and separately from this, xylene solvent lo% was added to the curing agent to make the viscosity 10.
Liquid fluid mixed in the proportion of parts by weight, further 0.6
Using the standard sand of the ribs as the powdery solid content, these materials were mixed and sprayed using the same equipment as in Example 1 at a weight ratio of liquid fluid: powdery solid content = 1:6.5. .

The sea bream breaking stress yield value of this product immediately after spraying is 285k9/2, and no sagging or dust generation was observed after spraying it to a thickness of 2.
However, the bending strength was 135k9/ground, and after 3 days, the compressive strength was 493k9/ground, and the bending strength was 195k9/ground, and after 7 days, the compressive strength was 632k9/ground, and the bending strength was 278k9/ground. Example 3 Using the apparatus shown in Fig. 2, the aggregate tank 2 contained the same sand as in Example 1, the main agent of Example 1 was contained in tank 3a, and the curing agent thereof was contained in tank 3b. and carry out the spraying pipe 1.
The binding component squeezed out is dispersed in atomized form, mixed with pumped sand, and sprayed onto the construction surface.The spraying ratio of each material is as follows:
The curing agent from tank 3b was 0.5 parts, and the sand from tank 2 was 9 parts to 1 part of the main agent from tank 3a.

The shearing force at the time of spraying is approximately 1 ship/ship, the compressive strength after 3 days is approximately 300k9/ship, and after 7 days it is approximately 650x9/ship.
It was confirmed that this was the case.

Example 4 Spraying using the same materials and blending ratio as in Example 3 was carried out using an apparatus as shown in FIG.

That is, once the two components of the polymer are mixed into the air supply fluid,
This is mixed with sand floating in the pressurized air and sprayed, and in this case, the trout breaking force at the time of spraying is 13
The compressive strength after 3 days is 385k9/ground, and the compressive strength after 7 days is 758.
We were able to obtain better results against k9/ground.
Example 5 Using a device as shown in FIG. 4, resin concrete containing coarse aggregate was sprayed.

That is, the spray pipe line 1 is a pressure-resistant hose with an inner diameter of 1.5 inches.
1 part of gravel from hopper 15 and 2 parts of sand from hopper 16 are extracted from the mixer 11 via hopper 13.
The epoxy resin base resin was mixed in the hopper 19 and the curing agent was delivered in the same ratio as in Example 1 from the hopper 20, and the mixture was placed near the nozzle 6. The two polymer components (base resin,
A curing agent) was added in multiple stages to achieve atomization and mixing, and the mixture was mixed with the pumped flow of the aggregate and sprayed. The weight ratio of the curing agent to 1 part of the main resin is 0.5 in accordance with each of the above-mentioned examples.
9 parts of sand (so 4.5 parts of gravel)
However, there was almost no rebound during spraying, and the numerical shear stress of the sprayed resin concrete was measured as shown in Figure 7. Furthermore, the compressive strength after 3 days was 362 [9/
Unfortunately, after 7 days, it reached 783k9/ground.
Example 6 Using the same method as in Example 5, a liquid fluid containing a urethane base agent with a viscosity of 200 at 25°C and a curing agent with a viscosity of 1650°C at the same temperature condition in a 1:1 weight ratio was used. ,
On the other hand, standard sand produced in Toyoura, Yamaguchi Prefecture in column 0.6 was mixed at a weight ratio of 5 times that of the liquid fluid and sprayed.

The shear stress yield value of this product immediately after spraying was about 6 mm, and the spraying could be carried out smoothly without causing any sag when spraying a thickness of -8 mm.

Also, the compressive strength of this product after 2 special intervals is 235k9
/ Section, bending strength is 93X9/average, compressive strength after 3 days is 3
The bending strength is 95K9/K, and the bending strength is 153KG, and after 7 days, the compressive strength is 4 KG/S, and the bending strength is 193K9/.
It reached the island. Example 7 When spraying the same composition as in Example 5, the main ingredient and curing agent were atomized and mixed in compressed air in advance as shown in Figure 5, and then added and mixed to the aggregate. did.

That is, the Nada shear force at this time was the same as that in Example 4, but the compressive strength after 3 days was 395 k9/ground, and the compressive strength after 7 days was 813 kg/ground, which was better in Example 4. You can get results. Example 8 As shown in FIG. 4, spraying was carried out using asphalt as the polymer using an apparatus similar to the apparatus employed in Examples 5 to 7.

That is, at a position approximately 10 mm away from the spraying location using the nozzle, a mixture of 3 parts sand and 1 part pea gravel on the 5th side was sprayed using a pressure hose with an inner diameter of 1.5 inches in the spray pipe line 1 for about 8 embodiments. It is sent with a pressure of 225q for this item.
The asphalt fluid heated to a temperature of 100 ℃ is pumped using a pipe with an inner diameter of 19 legs and covered with a heat retention means using electric heating, and the asphalt fluid is mixed with the pumped aggregate just before the nozzle, and then sprayed onto the construction surface. Constructed. The asphalt, which had considerable fluidity during spraying, instantaneously becomes non-fluid, and the shearing stress at that time is 32 kg/m, which is caused by sand being mixed into the Newtonian fluid, resulting in a capillary shape. It is recognized that the temperature of the asphalt decreased and the asphalt became non-flowing.

Example 9 1 part by weight of sand produced in Toyoura, Yamaguchi Prefecture, as in Example 1, was mixed in advance with 0.034 parts of glass fibers with a length of 5 sails, and this was mixed with a hose at a pressure of 6k9 pieces. At the same time as pneumatically feeding, the epoxy resin base resin and curing agent are
Resin-based polymer immediately after blending at a ratio of 1:0.25
Parts by weight were dispersed and added at a position close to the nozzle 6, and spraying was carried out.

Immediately after spraying, the cutting force of the trout was 5 female/male, and the spraying was performed on a 65-inch thick rib in one go, but there was no sagging at all, and there was no generation of dust or splashing, and the blowing was smooth. The compressive strength after 2 hours of anchoring is 3.
78k9/ground, bending strength is 205k9/ground, 3 days later compressive strength is 40k9/ground, bending strength 295k9/ground, 7 days later bending strength is 785k9/ground, bending strength is 4
Reached 78k9/enemy.

Example 10 A liquid fluid prepared by mixing a PS polyester base resin with a viscosity of 100 at 25°C and a PS curing agent with a viscosity of 85 at the same temperature in a ratio of 0:0.015 and standard sand of 0.6 ribs were mixed in Fig. 4. Standard sand (powdered solid content) was mixed at a ratio of 5.5 parts by weight to 1 part by weight of the liquid fluid and sprayed using an apparatus as shown in FIG.

The fracture stress yield value of this product immediately after spraying was so low that it was possible to spray a 4-inch thick coat and achieve smooth construction without causing any sagging.

Also, the strength of this product is between 2 unique and the compressive strength is 397k9/
The bending strength of the ground is 192k9/m, and after 3 days, the compressive strength is 648k9/m, and the bending strength of the ground is 273k9/m, 7
Compressive strength is 893k9/ground, bending strength is 3
It was 95k9/. According to the present invention as explained above, a resin-based polymer such as resin or asphalt material or other organic binder is used, and the addition position of this resin-based polymer to the aggregate fed by high-pressure air is appropriately selected. It can be sprayed after finding a sufficient conveyance distance, and it can be sprayed smoothly under favorable working conditions where no dust is generated. The non-fluidizing action of mixed spraying and the beating action of materials containing aggregate particles during spraying work together to achieve stable spraying without sagging or peeling, resulting in outstanding construction in terms of strength and other performance. This invention can be accurately realized by a simple and quick spraying method, and has great industrial effects.

[Brief explanation of drawings]

The drawings show embodiments of the present invention, and FIG. 1 is a schematic explanatory diagram showing one example of an apparatus for carrying out the spraying method according to the present invention, FIG. 2 is an explanatory diagram of a modification thereof, and FIG. Figure and 4th
5 and 6 are explanatory diagrams showing a partial modification of the portion A in FIG. 4, and FIG. 8 is a side explanatory diagram of the method for obtaining the specimen, FIG. 9 is a planar explanatory diagram thereof, and FIG. 10 is an explanatory diagram of the measurement method, FIG. 11 is a chart showing the relationship between the ratio of solid content to liquid content in the sprayed layer and crucian carp shear stress. In these drawings, 1 is the spray pipe, 2 is the aggregate tank, 3 is the binder tank, 3a is the main agent tank, 3
b is its curing agent tank; 4 is a valve; 5 is a high-pressure air pipe; 6 is a nozzle; 1 is a blowing surface; 11 is a mixing mechanism; 12 is a supply port;
17 and 18 are pumps, and 19 and 20 are hoppers, respectively. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 Figure 10 Figure 11

Claims (1)

[Claims] 1. When spraying a mixture of aggregates and an organic binder under pressure, it is possible to mix powdery solids such as the aggregates with resinous or asphalt materials. An organic binder or a liquid or slurry-like liquid flow component mainly composed of organic binder is pumped separately, and the liquid flow component is pumped near a spray nozzle in a high-pressure air pipe that pumps the powdery solid content. A spraying construction method characterized in that the two materials are mixed and sprayed in the process from the addition point to the spraying surface. 2. The spraying method according to claim 1, which uses a solvent type organic binder. 3. A patent for using an organic binder consisting of two or more components, preparing the main component and curing agent separately, and immediately after mixing them, dispersing them into a pumped high-pressure air stream containing granular solids. A spraying construction method according to claim 1. 4. The spraying method according to claim 1, in which an emulsion type organic binder is used as the organic binder. 5 When spraying a mixture of aggregates and an organic binder under pressure, the granular solid content of the aggregate and an organic binder such as resin or asphalt or the like may be used. A main liquid or slurry liquid flow component is prepared separately, and the above-described powdery solid component is pumped with high-pressure air, and the above-described liquid flow component is pumped under a low shear stress state. The liquid component is dispersed and added near the spray nozzle in the high-pressure air pipe that pumps the powdery solids, and in the process from this addition point to the spray surface, the shear stress of the liquid flow component is calculated by multiplying the spray layer thickness and its specific gravity. A spraying construction method characterized by mixing and spraying in a higher state. 6. The spraying method according to claim 5, in which powdery solids are added and mixed in a volume ratio of 1:2 or more to the pumped liquid fluid. 7. The spraying method according to claim 5, in which a powdery solid content is added and mixed in a weight ratio of 1:4 or more to the pumped liquid fluid content. 8 When carrying out spray construction by pumping a mixture of aggregates and organic binders, powdery solids such as the aggregates and organic binders such as resins or asphalt or the like may be used. A liquid or slurry-like liquid flow component mainly composed of A spraying construction method characterized in that a fluid component is dispersed and added to a pumped solid component, and in the process from this addition point to a spraying surface, the two materials are mixed and sprayed.