JP2945566B2 - Supply method of reinforcing fiber in mortar spraying - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for supplying reinforcing fibers in a method for spraying mortar reinforced with a plurality of short fibers.

[0002]

2. Description of the Related Art Mortars containing fibers are used as wall mortars because they have high bending and tensile strength or toughness, have long-term stability, have high resistance to drying shrinkage, and have excellent crack resistance. It is constructed by spraying from the viewpoint of workability. The short fibers used for this reinforcement include steel fibers, glass fibers, vinylon fibers, and carbon fibers, but a mortar wall excellent in bending load and bending toughness can be obtained by mixing these rather than using them alone. Is known to be.

Therefore, conventionally, the plurality of reinforcing short fibers and mortar are preliminarily mixed by a forced stirring mixer, an omni mixer, or the like, and the mixture is sprayed on a spraying surface through an air compressor or the like.

[0004]

However, in practice, it is difficult to uniformly mix fibers and mortar with such a mixing method due to a difference in specific gravity between the fibers and mortar. In addition to the drawback that the dispersion of the fibers becomes non-uniform, there are also problems such as that it takes time to measure the fibers.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has as its object to disperse a plurality of reinforcing short fibers in a mortar uniformly and to eliminate the trouble of fiber measurement. It is intended to provide a method for supplying fibers in spraying.

[0006]

In order to achieve the above object, the present invention provides a method for blowing reinforcing fibers by an air compressor.
A mortar spraying method of mixing reinforcing fibers, in which a reinforcing fiber-mixed mortar is ejected from a nozzle opening of the spray gun while being sent to an application gun, and the reinforcing fiber is roving two or more types of fibers. While simultaneously cutting with a cutter, the cut mixed short fibers are continuously fed to the spray gun side by the air pressure of the air compressor.

[0007]

According to the above-mentioned method, a plurality of fibers are cut at the same time, and the mixed short fibers are air-fed to the vicinity of the spraying surface.
At the same time, the mortar is mixed with the mortar fed under pressure and jetted out from the nozzle port of the spray gun by air pressure, and is sprayed on the painted surface.

The optimum mixing ratio of the mixed short fibers to the mortar can be previously adjusted by adjusting the air pressure for feeding the mixed short fibers and the driving of the roving cutter.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows a spraying apparatus to which the present invention is applied. The spraying apparatus includes a mortar pump 1, a roving cutter 2 for continuously processing reinforcing fibers, an air compressor 3, and a connection therewith. Spray gun 4 is provided.

One end of the pump 1 is a mortar mixer 5
And the other end is connected to the supply side of the spray gun 4 through a pressure feeding hose 7.

The roving cutter 2 includes a rotary cutter 9 in a closed casing 8 having a rear portion connected to the discharge end of the air compressor 3 through an air hose 3a.
A plurality of fiber bobbins 1 installed outside the casing 8
The fiber rovings 10a, 11a, 12a fed out from rollers 0, 11, 12 through a roller or the like are sequentially taken into a casing 8 and continuously cut by a cutter 9 to produce mixed short fibers. The air is sent from the discharge port 8a provided at the end of the casing 8 to the spray gun 4 through the air hose 13 by air pressure.

The spray gun 4 includes an inner pipe 14 connected to an air hose 13 for pressure feeding of the mixed short fiber, and an outer pipe 15 surrounding the outer periphery of the distal end of the inner pipe 14 and connected to a mortar pressure feeding hose 7. A spraying air ring 16 disposed on the outer periphery of the outer tube 15 and a nozzle port 17 provided at the tip of the spraying gun 4.

The blowing air ring 16 applies air pressure to the mortar to provide a driving force for jetting, and the outer periphery thereof is connected to the air compressor 3 through an air hose 3b.
The air ring 16 has a large number of air ejection holes 16a formed on the inner periphery of the air ring 16 at equal intervals and obliquely toward the tip of the outer tube 15.

In the above construction, in order to spray-coat the fiber-reinforced mortar on the coating surface 20, the pump 1, the roving cutter 2 and the air compressor 3 are simultaneously driven and a trigger (not shown) provided on the spray gun 4 is provided. By the operation, the respective fiber rovings 10a, 11a, 12a are continuously and simultaneously cut by the cutter 9 in the roving cutter 2, and the mixed short fibers are continuously air-pushed toward the spray gun 4.

At the same time, the mortar pumped by the pump 1 is supplied to the spray gun 4, and the mixed short fibers ejected from the inner tube 14 are mixed with the mortar in the outer tube 15 by the air pressure blown through the air ring 16. Spray gun 4
Is sprayed from the nozzle port 17 toward the coating surface 20, and coating can be performed in a state where the mixed short fibers are uniformly mixed and dispersed.

The optimum mixing ratio of the mixed short fibers to the mortar can be obtained by adjusting the pressure of the air hose 3a or adjusting the rotation speed of the cutter 9 in advance.

Also, Each fiber roving 10a, 11a,
12a should be selected according to the above-mentioned properties of the fiber. For example, in this embodiment, an average value of the properties of three kinds of fibers is obtained, but two or three or more kinds may be obtained. By increasing or decreasing the number of installed bobbins, desired characteristics according to the type of fiber and the ratio of fiber can be obtained.

The mortar used in the present invention is not limited to cement mortar and concrete, but can also be used for waterproofing materials such as asphalt mortar.

FIG. 2 shows another embodiment of the present invention, in which a guide pipe 8b is provided in a fiber roving introduction hole of a casing 8. As shown in FIG. By passing the fiber roving through the guide pipe 8b, flapping of the fiber roving due to the air flow in the casing and the resulting separation from the cutter are prevented, and the fiber with the backflow of air from the introduction hole due to the pressure increase in the casing is prevented. Prevent the roving from slipping out. Further, in this embodiment, the air hose 3a
By arranging the introduction hole, the cut portion of the roving cutter 9 and the discharge port 8a substantially in a straight line, the roving cut by the cutter is sent to the discharge port 8a without scattering in the casing 8. I made it.

[0020]

As described in detail in the above embodiments, in the method of supplying reinforcing fibers in mortar spraying according to the present invention, a plurality of fibers are cut at the same time, and the mixed short fibers are cut near the spraying surface. It is mixed with the mortar that is sent by air until it is mixed with the mortar that has been sent at the same time.Then, it is ejected from the nozzle port of the spray gun by the air pressure and sprayed on the painted surface. Without uneven distribution in the distribution of dispersed fibers due to specific gravity difference,
It is applied to the painted surface in a state of being uniformly mixed and dispersed, and a high quality mortar painted surface having a constant quality and according to the characteristics of each fiber is obtained.

Further, in the present invention, the optimum mixing ratio of the mixed short fiber to the mortar can be adjusted in advance by adjusting the air pressure and the driving of the roving cutter, so that the labor of measurement and the like becomes unnecessary, and the spraying operation can be easily performed. be able to.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing the overall configuration of a spraying device to which the method of the present invention is applied.

FIG. 2 is an explanatory view showing another embodiment of the roving cutter according to the present invention.

[Explanation of symbols]

 Reference Signs List 1 mortar pump 2 roving cutter 3 air compressor 4 spray gun 10a, 11a, 12a fiber roving 20 painted surface

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Haruka Ogawa 4-640 Shimoseito, Kiyose-shi, Tokyo Inside Obayashi Corporation Technical Research Institute (56) References JP-A-63-39655 (JP, A) JP-A Heihei 1-10874 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) E04G 21/02 103 E04F 21/08

Claims (1)

(57) [Claims] 1. A reinforcing fiber is sprayed by an air compressor.
A method of spraying mortar of reinforcing fiber mixture, in which mortar of reinforcing fiber mixture is jetted from a nozzle opening of the spray gun while being pumped to a spray gun, and the reinforcing fiber is roving two or more types of fibers. A method for supplying reinforcing fibers in mortar spraying, wherein the cut mixed short fibers are continuously fed to the spray gun side by the air pressure of the air compressor while simultaneously cutting with a cutter.