JPH06336835A - Dry spraying method and dry spraying device - Google Patents

Abstract

PURPOSE:To provide a dry spraying method which is easy in mortar adjustment, less in rebound rate, excellent in workability, suitable for work of a highly strong structure such as walls, etc. CONSTITUTION:Cement is retrieved after metering continuously from a storage device 1 so that a desired cement-aggregate ratio can be obtained, aggregate is retrieved after metering continuously from a storage device 2, the cement and aggregate are stored continuously into a mixing machine 5 by a transporting machine 4 and, while the cement and aggregate are agitated continuously by an agitating machine 5 to produce mortar material, they are fed continuously from the mixing machine 5 to a spraying machine 6. The mortar material is mixed continuously with compressed air in a spraying machine, the mortar material mixed with compressed air is fed continuously to a nozzle device 8 through an air feed tube 7, and injection water flow of a quantity at which a desired cement-water ratio can be obtained is sprayed continuously to the mixing area of the nozzle device 8. Then the injection water flow and mortar material are mixed continuously to produce mortar, and the mortar is sprayed on a work part 21 through high speed air flow. Thus the cement does not react with water, etc., in the aggregate nor deteriorate before the cement made in contact with the injection water flow.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dry spraying method and a dry spraying device, and more particularly to measuring cement and aggregate, mixing spraying mortar raw material composed of cement and aggregate, mixing spraying mortar raw material with high pressure air, and The present invention relates to a dry spraying method and a dry spraying device for continuously mixing a sprayed mortar raw material and water immediately before spraying.

[0002]

2. Description of the Related Art The dry spraying method has been adopted as a shotcrete in the field of civil engineering. It is a spraying mortar consisting of cement and aggregate dispersed in an air stream immediately before the outlet of a spraying nozzle device. This is a method in which a necessary amount of water is added as a jet water flow to a raw material, and the mixture is stirred and mixed to form mortar, which is a mixture of cement, aggregate and water, and this mortar is placed on a high-speed air stream and sprayed onto a construction site. This dry spraying method is used for primary lining of tunnels, facing of earth and mud walls, coating of bricks, masonry, concrete, etc., reinforcement and repair of various concrete structures.

[0003]

In order to construct a structure such as a wall having a high strength by the dry spraying method, the mixing ratio of water and cement (that is, the water-cement ratio) should be reduced, and the cement and the aggregate should be reduced. It is necessary to sufficiently mix (knead) water and water. Further, when the water-cement ratio can be reduced to sufficiently mix the cement, aggregate and water, the mortar sprayed from the outlet of the outlet nozzle device or the outlet of the outlet pipe attached to the outlet is It easily adheres to the construction area, the rebound (rebound) rate of the mortar is reduced, the generation of dust is reduced, the working environment is improved, and the construction efficiency is improved. However, the conventional dry blasting equipment used for primary lining of tunnels in the field of civil engineering, facing of rock walls, etc., has a large automatic kneader for cement, aggregate and water, and has a pneumatic hose. Thick, high air pressure for pneumatic delivery, its outlet (nozzle) can not turn a little,
The conventional dry spraying method using a dry spraying device has a drawback that the rebound rate of mortar is high, the strength of the formed shotcrete is small, and it is not suitable for construction of a structural wall that receives the force of a building. The problem to be solved by the present invention is to provide a dry spraying method and a dry spraying device which do not have the above-mentioned drawbacks of the prior art, in other words,
It is an object of the present invention to provide a dry spraying method and a dry spraying device which are easy to prepare mortar, have a small rebound rate, have good workability, and are suitable for constructing structures such as high-strength walls.

[0004]

The present invention adopts the following configuration as a means for solving the above problems. The configuration of the present invention is such that cement is continuously weighed out from the cement reservoir, and aggregate is continuously weighed out from the aggregate reservoir so as to obtain a desired cement-aggregate ratio. The cement and aggregate that have been carried out are continuously carried into the mixer by the transporter, and the cement and aggregate that are carried into the mixer are continuously stirred and mixed in the mixer to be a sprayed mortar raw material while the sprayed mortar is used as the raw material. The raw material is continuously carried from the mixer to the spraying machine, the sprayed mortar raw material carried into the spraying machine is continuously mixed with the high pressure air in the spraying machine, and the sprayed mortar raw material mixed with the high pressure air is passed through the air feeding pipe to the nozzle. The mixture is continuously carried into the mixing zone of the device, and a jet water stream consisting of water having a desired cement water ratio is continuously jetted into the mixing zone of the nozzle device, and the jet water stream and the sprayed mortar raw material are mixed in the zone. At Continuing contact mixing to produce mortar, which is a mixture of cement, aggregate and water, and placing the mortar on a high-speed air stream and continuously spraying it on a construction part such as a wall. It is in the dry spraying method. In a preferred embodiment, the fuselage is equipped with a cement store, an aggregate store, a carrier and a mixer, the cement is continuously transported from the cement store to the carrier, and the aggregate is continuously run from the aggregate store. Then, the cement and the aggregate that are carried out to the carrier are carried into the mixer continuously by the carrier,
The sprayed mortar raw material made by continuously stirring and mixing with the mixer is continuously discharged from the discharge port of the mixer, the sprayed mortar raw material is continuously received by the receiving portion of the sprayer, and the mortar raw material is sprayed. The mortar raw material mixed with the high-pressure air is continuously fed to the mixing area of the nozzle pipe of the nozzle device through the air feeding pipe. Further, in a preferred embodiment, the ratio of the volume of the cement store and the volume of the aggregate store is set to a value that can correspond to the normal cement-aggregate ratio, and the sizes of the cement store and the aggregate store are set for a predetermined time. (For example, 30
Min-60 min) to the minimum size that allows spraying work. Furthermore, the water content of the aggregate or the aggregate put in the aggregate reservoir is measured in advance, and the amount of water continuously jetted into the nozzle tube of the nozzle device is determined according to the water content of the aggregate. , Maintain the cement water ratio at a substantially constant level.

According to the structure of the present invention, the cement store and the aggregate store are provided on the upper side of the machine body, the carry-out device for measuring and delivering the cement is provided at the bottom of the cement store, and the aggregate is provided at the bottom of the aggregate store. And a belt-type carrier so that the belt extends in the front-rear direction of the machine body below the cement storage and aggregate storage, and the belt is a transporter for the cement storage. Of the sprayer and the exit of the unloader of the aggregate storage device, the mixer is provided on the front side of the machine body, the carry-in inlet of the mixer is opposed to the unloading part of the front part of the belt type transporter, and The spray device is arranged so that the receiving part is below the discharge port at the front part of the mixer, and the carry-out part of the spray device is connected to the nozzle device via the pneumatic tube. It is in. In a preferred embodiment, a cement store is provided on the front side above the machine body, a carry-out machine is provided at the bottom of the cement store to measure and discharge cement using a measuring screw device, and an aggregate storage having an opening at the bottom is provided. The conveyor is provided on the rear side above the fuselage, and the belt type conveyor is provided so that the belt extends in the longitudinal direction of the fuselage below the cement storage and aggregate storage. The metered amount of aggregate is controlled by facing the opening at the bottom and facing the outlet of the unloader of the cement storage, and adjusting the gap between the lower edge of the gate plate and the upper surface of the belt on the front side of the aggregate storage. A unloader that can be installed is provided, and the mixer is provided on the front side of the machine body with its front portion inclined upward, the carry-in inlet of the mixer is located below the unloading section at the front of the belt type transporter, and the spraying machine is The receiving part is below the discharge port at the front of the mixer. Arranged to to come to, inferior to reduce the space occupied by the dry spraying apparatus.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The dry spraying apparatus 10 of the embodiment is schematically shown in FIG. 1, in which a cement reservoir 2 is provided on the front upper side of the machine body 1 placed on a table 20, and on the rear upper side of the machine body 1. An aggregate storage device 3 is provided, a belt storage device 4 is provided below the cement storage device 2 and the aggregate storage device 3, and a mixer 5 is provided on the front side of the machine body 1 with its front portion inclined upward. The spraying machine 6 is provided below the front part of the mixer 5, one end of the pneumatic hose 7 is connected to the outlet pipe 6u of the spraying machine 6, and the other end of the pneumatic hose 7 is connected to the nozzle device 8. Thus, the worker Ma can hold the nozzle device 8 and spray the mortar from the outlet of the nozzle device 8 onto the construction portion 21 such as the outer wall of the building. As shown in FIGS. 2 to 6, the cement reservoir 2 includes a funnel-shaped body 2a, and the funnel-shaped body 2a is fixed to the machine body 1 by an appropriate means, and a centering screw is attached to the bottom 2b having a U-shaped cross section. A device 2A is provided, and a shaft 2d of a screw 2c of the device 2A and a motor M ₁ attached to the machine body 1 are connected via a chain wheel cw and a chain ch so that the shaft 2d can be rotated at a desired speed. Has become. A short cylinder 2e is fixed to the center of the lower part of the funnel-shaped body 2a, a measuring screw device 2B is provided below the short cylinder 2e, and a short cylinder 2g is provided above the rear part of the outer cylinder part 2f of this device 2B. , Its outer cylinder 2
A short cylinder 2h is provided on the lower side of the front portion of f, and the rear portion of the outer cylinder portion 2f is supported by connecting the flanges of the pair of short cylinders 2e and 2g by an appropriate means. The front part is supported by the body 1 by appropriate means. The funnel-shaped member 2a has a vibrator V on the front and rear inclined walls.
₁ , V ₂ are attached to prevent cement from adhering to the wall surface. Measuring screw device 2B screw 2
The shaft 2k of j has its front end and rear end pivotally supported, and
Is connected to the motor M ₂ attached to the chain wheel cw via the chain ch so that the shaft 2k can be rotated at a desired speed, and the weighed cement is conveyed from the front short cylinder 2h by a belt method. It is designed to continuously drop onto the belt 4a of the machine 4.

The aggregate reservoir 3 is shown in FIGS. 2, 3, 4, and 7.
As shown in the figure, it comprises a box body 3a with front and rear walls having vertical walls and funnel-shaped walls on both sides. The box body 3a is fixed to the machine body 1 by an appropriate means, and is placed in the middle of the box body 3a. A vibrating screen 3b for sieving is provided, and the vibrating screen 3b is provided.
The upper side of the belt 4a of the belt type transporter 4 is located below. The vibrating screen 3b can be vibrated by an appropriate driving device such as a motor. Aggregate storage 3
A weighing-out mechanism 3A that uses a gate plate 3d is provided on the front side of the device, and this mechanism 3A includes a gate plate 3d that can move up and down along a wall 3c and a guide piece 3e that guides the gate plate 3d along the wall 3c. The discharge amount of the aggregate can be measured by making the lower end surface 3d ₁ of the gate plate 3d face the upper side surface of the belt 4a and adjusting the gap between the lower end surface 3d ₁ and the upper side surface of the belt 4a. It is like this. A rack 3f is attached to the outside of the gate plate 3d, and the adjustment shaft 3 is pivotally supported by the wall 3c.
The pinion 3h attached to g is meshed with the rack 3f. A shaft 3m is pivotally supported by a bearing mounted on an outer side plate 3k supported by a stay 3j fixed to the machine body 1, a handle 3n is mounted on one end of the shaft 3m, and the other end of the shaft 3m is adjusted via a universal joint 3p. A pointer 3q is attached to the shaft 3m and is connected to 3g, and a display plate 3r is provided facing the pointer 3q. When the shaft 3m is rotated by turning the handle 3n, the rotation of the shaft 3m is transmitted to the adjustment shaft 3g through the universal joint 3p, and the rack 3f moves up and down in response to the rotation of the pinion 3h to move the gate plate 3d. A gap (gap) between the lower end surface 3d ₁ and the upper surface of the belt 4a is adjusted so that the amount of the aggregate carried out from the aggregate storage 3 can be adjusted. In addition,
The storage units 2 and 3 are arranged so that the ratio of the volume of the aggregate storage unit 3 to the volume of the cement storage unit 2 can correspond to a normal mixing ratio of cement and aggregate (for example, 1: 3 to 1: 4). To manufacture.

As shown in FIGS. 2, 3 and 4, the belt type conveyor 4 has an endless belt 4a whose front side is hooked on a drive wheel 4b and whose rear side is below the rear part of the aggregate store 3. The endless belt 4a, which is hung on the driven wheels 4c arranged, extends below the cement store 2 and the aggregate store 3, and its front end is inclined upward and is located above the rear part of the mixer 5. ing. The shaft 4b ₁ of the drive wheel 4b and the shaft of the motor M ₃ attached to the machine body 1 are connected via a chain wheel cw and a chain ch, and the shaft 4b ₁ rotates by the rotation of the motor M ₃ and the upper surface of the endless belt 4a. Is moved forward at a predetermined speed so that the measured cement and aggregate can be dropped into the carry-in port at the rear of the mixer 5. As shown in FIGS. 2, 3 and 8, the mixer 5 includes a cylindrical body 5A, a mixing shaft 5B, an angle adjuster 5C, a motor M _{4 and the} like, and the angle with respect to the horizontal plane can be adjusted in front of the machine 1. Moreover, it is arranged so that it can be rotated by a predetermined angle with respect to the central axis of the machine body 1 in plan view. Cylindrical body 5A
Is composed of an upper part 5a and a lower part 5b.
The rear part of a is attached to a bracket 5c attached to the front part of the machine body 1 so as to be vertically and horizontally rotatable, the bracket 5d is fixed to the front part of the upper part 5a, and the pulley 5e is attached to this bracket 5d. ing. Further, the support arm 5f of the angle adjuster 5C is pivotally supported by the bracket 5g on the front part of the machine body 1 through the vertical shaft 5h so as to be rotatable by a predetermined angle.
A winch 5j driven by a motor M ₅ on the support arm 5f
And install pulley 5k. The rope 5m wound around the winch 5j is hung on the pulley 5k and the pulley 5e, and then the rope 5
hang m on the pulley 5k again and attach the free end to the bracket 5d.
Stick to. When you wind 5m of rope around winch 5j,
When the front part of the mixer 5 is lifted and the inclination angle becomes large, and when the rope 5m is paid out from the winch 5j, the front part of the mixer 5 descends and the inclination angle becomes small.

The mixing shaft 5B of the mixer 5 is provided with a screw 5n at its rear portion, and a large number of stirring blades 5p are provided at the center thereof.
Is attached, and a screw 5q is attached to the front part thereof, and is housed in the cylindrical body 5A. The rear end of the mixing shaft 5B is pivotally supported by the rear end of the tubular body 5A, and the front end thereof is the tubular body 5A.
Is rotatably supported by a bracket 5r fixed to the front end of the upper part 5a of the motor, and the shaft of the motor M ₄ mounted on the upper side of the bracket 5r and the front part of the mixing shaft 5B are connected via a chain wheel cw and a chain ch. . At the rear part of the upper portion 5a of the tubular body 5A, there is provided a carry-in inlet for receiving the cement and aggregate falling from the carrying-out portion at the front end of the belt 4a, and at the lower side of the front part of the tubular body 5A, there is provided a discharge port 5s. , Mixing shaft 5 by rotation of motor M ₄
B rotates, and the cement and aggregate carried into the rear part of the tubular body 5A are forwardly fed by the screw 5n, agitated and mixed by the agitating blade 5p, and the mixture is forwardly fed by the screw 5q and continuously discharged from the outlet 5s. It is designed to be able to discharge a fixed amount.

As shown in FIGS. 1 and 9 to 11, the spraying machine 6 has a receiving portion 6A for spraying mortar raw material composed of a mixture of cement and aggregate, a carry-in device 6B, and a pressure air chamber 6
C, unloading device 6D, and the like. The receiving portion 6A is composed of a funnel-shaped body 6a, and a screen 6b for sieving is arranged substantially horizontally on the upper portion thereof, and the receiving portion 6A is installed on the upper portion of the spraying machine 6. The carry-in device 6B is provided between the outlet of the receiving portion 6A and the inlet of the pressurized air chamber 6C, and has a body 6c.
A pair of pockets 6 around the inside of the cylindrical opening 6d.
The cylindrical body 6f having e ₁ and 6e ₂ is fitted, and the sprayed mortar raw material that has fallen from the receiving portion 6A is stored in the pocket 6e ₁ ,
6e ₂ and the cylindrical body 6f is rotated by a drive device such as a motor to maintain the high pressure in the pressure air chamber 6C, while receiving the mortar raw material in the pockets 6e ₁ and 6e ₂ in the pressure air chamber 6C. It can be dropped into the mouth. Ejecting air from the air injection portion 6g attached to the device body 6c promotes falling mortar material in the pocket 6e _1, 6e _2, high pressure air pockets 6e _1, 6e in ₂ discharged from the air discharge unit 6h . The air injection unit 6g is connected to the high pressure air supply source Sa via a pipe line.

As shown in FIGS. 9 to 11, the pressure air chamber 6C is an airtight cylindrical box body 6m having a receiving port 6j at its upper portion and one discharge port 6k at its lower peripheral portion. Is configured. A rotary body 6C1 that is positively rotated by a drive device such as a motor around a vertical axis as a rotation center is installed in the lower part of the center of the box body 6m, and a truncated cone portion 6n of the rotary body 6C1 is installed.
The stirring arm 6p is attached to the upper end of the bottom plate 6q, and the recesses 6r are formed at equal intervals on the outer peripheral portion of the bottom plate 6q.
A ridge 6s extending in the radial direction is formed between r.
As shown in FIGS. 10 and 11, the carry-out device 6D has a discharge port 6k of the pressure air chamber 6C, a supply pipe 6t and a discharge pipe 6u joined to each other, and the supply pipe 6t has an injection port 6v opening downward. The injection pipe 6w is connected, the high pressure air supply pipe 6x is connected in the middle of the discharge pipe 6u, and the discharge pipe 6u is connected to the one end 7a of the pneumatic hose 7. The spraying machine 6 is shown in FIG.
As shown in FIG. 11, the sprayed mortar raw material dropped from the carry-in device 6B into the pressure air chamber 6C is scattered into the pressure air chamber by the stirring arm 6p of the rotating body 6C1 rotating in the box body 6m, and the bottom plate of the rotating body 6C1 is scattered. It is evenly distributed in the concave portions 6r of 6q. The sprayed mortar raw material that has entered the concave portion 6r of the bottom plate 6q is blown into the outlet pipe 6u by the high-speed air flow ejected from the injection port 6v when the concave portion 6r comes under the injection port 6v of the injection pipe 6w. The sprayed mortar raw material blown into the outlet pipe 6u is connected to the outlet pipe 6u by the high pressure air flow supplied from the supply pipe 6x.
Sent in. High-pressure air having a desired pressure and volume is supplied to the supply pipes 6t and 6x from a high-pressure air supply source Sa through a pipe line. The high-pressure air supply source Sa is composed of an air compressor, an air tank, a pressure regulator, etc.
g and the pressure and volume of the air sent to the supply pipes 6t and 6x can be adjusted.

As shown in FIG. 12, the nozzle device 8 has the other end 7 of the pneumatic hose 7 in the opening 8b on the left side of the main body 8a.
b is fitted and fixed, and the nozzle tube 8 is inserted into the opening 8c of the main body 8a.
A is fitted and fixed, and a bent water supply pipe 8f is fixed to the opening 8e communicating with the annular recess 8d of the main body 8a via a connecting short pipe, and the water supply pipe 8f is pressurized to a high pressure (for example, 70 kg / cm ^{2 to} 110 Kg / cm ² ) It is configured to be connected to a water supply source Sw, and a water supply pipe 8f is provided with an opening / closing valve 8i with a handle 8h. The high-pressure water supply source S
The w is configured by connecting a water tank, a low pressure pump, a flow meter with a flow rate adjusting means, and a high pressure pump in series, for example. Mixing section 8 facing annular recess 8d of main body 8a of nozzle tube 8A
A large number of injection holes 8m are formed on the wall portion of k, and the large number of injection holes 8m are formed by three injection hole rows, and each injection hole row is formed by a plurality of injection holes 8m arranged at equal pitches. ing.
The plurality of injection holes 8m in the injection hole rows on both sides are arranged in parallel to each other and in a plane orthogonal to the axis of the mixing passage 8n, and the center axis of the injection holes 8m in the right injection hole row and the right injection hole row are arranged. The central axis of the injection holes 8m is circumferentially offset by half the arrangement pitch of the injection holes 8m. The central axes of the plurality of injection holes 8m in the central injection hole row are arranged in parallel to each other and in the same plane orthogonal to the axis of the mixing passage 8n, and are aligned with the central axes of the injection holes 8m of the right and left injection hole rows. The jet water flow, which is positioned perpendicular to the parallel virtual axes and is jetted from the large number of jet holes 8m, is formed in a lattice shape when viewed from the flow direction of the mixing passage 8n. The outlet pipe 9 is shown in FIG.
As shown in FIGS. 14 to 14, it is made of a flexible vinyl chloride pipe, one end 9a of which is fixed to the tip of the nozzle pipe 8A, and a throttle ring 9c is fitted to a portion from the other end 9b. The aperture ring 9c is formed by, for example, processing a metal plate into a trapezoidal short cylinder whose cross section is an isosceles side.

A dry spraying method using the dry spraying device 10 will be described. The cement-aggregate ratio (cement: sand) is usually 1: 3 to 1: 4. For example, cement store 2
Capacity of 0.55 m ³ , aggregate storage capacity 3 of 1.65
Set to m ³ . Cement reservoir 2 is filled with 0.55 m ³ of cement. As shown in FIG. 1, some aggregate (sand) on the floor 2
After measuring the water content of 2, only 1.65 m ^{3 of the} aggregate 22 is put into the aggregate reservoir 3 using the belt conveyor 23. The ratio of the amount of cement carried out from the cement store 2 to the amount of aggregate carried out from the aggregate store 3 becomes 1: 3, and the cement of the cement store 2 and the aggregate of the aggregate store 3 are predetermined. The rotation speed of the shaft 2k of the measuring screw device 2B, the gap between the gate plate 3d of the aggregate storage device 3 and the belt 4a, and the belt 4a so that they are all carried out in a time period (for example, 40 minutes to 50 minutes). Moving speed (number of rotations of shaft 4b ₁ of drive wheel 4b)
To set. Further, the rotation speed of the mixing shaft 5B of the mixer 5 and the rotation speed of the rotating body 6C1 of the spraying machine 6 are determined according to the discharge quantity of the cement and the aggregate, and the discharge quantity of the cement and the aggregate and the water content of the aggregate. According to the above, the flow meter of the high-pressure water supply source Sw is adjusted so that the water-cement ratio (W / C is, for example, 40% to 50%) becomes a predetermined value (45% at which a good result is obtained). And set it so that the required amount of water is supplied to the high-pressure pump. Furthermore, the pressure of high-pressure water of the water supply source Sw ^{(e.g., 70Kg / cm 2 ~110 Kg /} cm 2) becomes a predetermined pressure, the pressure of the high pressure air of the high pressure air sources Sa (for example, 3.
5 Kg / cm ^{2 to} 5.5 Kg / cm) is set to a predetermined pressure and a predetermined discharge amount. After that, the motor M
Start ₁ to M ₄ .

When the belt type conveying device 4 is activated, the aggregate is carried out from the aggregate storing device 3 by a predetermined amount according to the movement of the belt 4a, and the measuring screw device 2B of the cement storing device 2 is used.
When is activated, the cement is carried out from the short cylinder 2h of the measuring screw device 2B onto the aggregate on the belt 4a by a predetermined amount, and the aggregate and the cement move in accordance with the forward movement of the belt 4a.
It drops from the belt 4a and is carried into the tubular body 5A from the carry-in inlet of the tubular body 5A of the mixer 5, and this cement and aggregate are sent forward by the screw 5n, and the stirring blade 5
The mixture of the cement and the aggregate is mixed by stirring with p, becomes a spray mortar raw material, is further forwardly moved by the screw 5q, and is continuously discharged from the discharge port 5s by a constant amount. The discharged sprayed mortar raw material drops into the receiving portion 6A of the spraying machine 6 located below the discharge port 5s, and the sprayed mortar raw material from which large aggregates have been removed by the screen 6b is stored in the cylindrical body 6f of the carry-in device 6B. Pockets 6e ₁ and 6e ₂
When the cylinder 6f is rotated, the pocket 6e ₁ ,
The sprayed mortar raw material in 6e ₂ falls into the pressurized air chamber 6C. The sprayed mortar raw material that fell is the rotating body 6 that rotates.
When the stirring arm 6p of C1 scatters it into the pressure air chamber, distributes it evenly in the recess 6r of the bottom plate 6q, and the sprayed mortar raw material that has entered the recess 6r comes under the injection port 6v of the injection pipe 6w, The high-pressure air supplied from the supply pipe 6t is blown into the outlet pipe 6u by the high-speed air flow formed by being ejected from the injection port 6v, and the blown mortar raw material thus blown in is supplied with the high-pressure air flow from the supply pipe 6x. Is sent into the air supply hose 7. As the pneumatic hose 7,
For example, use a diameter of 38 mm and a length of 20 m.

The operator Ma holds the nozzle device 8 at the wall forming position, and the sprayed mortar raw material that has moved in the pneumatic hose 7 along with the high-speed air flow is the nozzle pipe 8 of the nozzle device 8.
It is carried into the mixing passage 8n of A, the handle 8h of the nozzle device 8 is rotated, and the opening / closing valve 8i is opened. A predetermined amount of high-pressure water is supplied from the high-pressure water supply source Sw to the annular recess 8d, and a high-speed jet water flow is jetted from the large number of jet holes 8m on the three jet hole rows. A large number of high-speed jet water flows are formed in a lattice shape when viewed from the flow direction of the mixing passage 8n. In the mixing passage 8n,
The sprayed mortar raw material that has moved along with the high-speed air flow comes into contact with the high-speed jet water flow formed in a grid shape, and water, cement, and aggregate are mixed well to form mortar. The mixture containing the mortar is discharged from the mixing area of the nozzle pipe 8A and flows into the blowout pipe 9. In the process of moving the discharge port and the passage 9d of the outlet pipe 9 from the mixing area of the nozzle pipe 8A,
Water in a mixture containing mortar composed of cement, aggregate and water tends to collect in the outer peripheral layer (especially lower layer) of the passage 9c, and cement and aggregate in the mixture tend to collect in the central layer of the passage. However, since the trapezoidal ring 9c having a trapezoidal cross-section is fitted in the portion of the blow-out pipe 9 that is converging to the outlet, the lower side of the passage 9d is narrowed and the inclined portion 9e is formed below the passage 9d. , 9f are formed, and the passage area of the water flowing under the passage 9d is narrowed, so that the water moves toward the center, that is, upward and comes into contact with the cement and aggregate flowing in the center, and the cement, The aggregate and water are mixed again. Therefore, the mortar composed of the well-mixed cement, aggregate and water can be blown out from the outlet of the blow-out pipe 9, and the well-mixed mortar can be blown to the construction part 21 such as a wall. Since there is no free water in the sprayed mixture containing mortar, the adhesive force 21 of the mortar to the working portion is increased, a mortar layer having a thickness of 40 mm can be formed on the working portion 21 at one time, and the rebound rate is also reduced.
The rebound rate when the throttle ring 22 is fitted and the blowout pipe 20 is used is 9% to 10%. In the embodiment, the diaphragm ring 9
The case where the flexible blow-out pipe 9 in which c is fitted is attached to the discharge port of the nozzle pipe has been described, but the rebound rate can be sufficiently reduced without using the blow-out pipe in which the throttle ring is fitted. The rebound rate when the blowoff pipe 20 is not used is 14%.

[0016]

The present invention has the following effects (a) to (g) by having the structure described in the claims. (A) The dry spraying method according to claim 1 is for carrying out the weighing out of cement from the cement store, the weighing out of aggregate from the aggregate store, the carrying of cement and aggregate by a carrier, the cement in a mixer, and the like. Bringing in aggregate, preparing and unloading spray mortar raw material by stirring and mixing, loading spray mortar raw material in spraying machine, mixing and unloading with high pressure air, nozzle device by air pipe of spray mortar raw material mixed with high pressure air Conveyance to the mixing area, contact mixing of the jet water flow and the sprayed mortar raw material in the mixing area of the nozzle device, preparing mortar which is a mixture of cement, aggregate and water, and continuously blowing out the mortar from the nozzle device. Since the cement is used, before the cement is brought into contact with the jet water flow, the cement does not react with water in the aggregate to change its quality, and is injected in the mixing area of the nozzle device. Can be obtained easily spray mortar material is mixed with the flow. Further, the cement and the aggregate are continuously weighed out from their reservoirs so as to obtain a desired cement-aggregate ratio, a sprayed mortar raw material is prepared, and the amount of water becomes the desired cement-water ratio. Since the jet water flow is continuously jetted into the mixing area of the nozzle device to form mortar which is a mixture of cement, aggregate and water, a mortar that is sufficiently mixed with a desired cement-aggregate ratio and cement-water ratio is obtained. It can be easily prepared. Therefore, when the mortar is placed on a high-speed air stream and continuously sprayed onto a construction portion such as a wall, the rebound rate of the mortar becomes small, and a structure such as a wall with high strength can be produced. (B) According to the second aspect, the cement store, the aggregate store, the carrier and the mixer are attached to the machine body,
It is possible to reduce the space required for preparing a sprayed mortar raw material composed of a mixture of cement and aggregate, preparing mortar which is a mixture of cement, aggregate and water. (C) According to claim 3, a cement storage container,
The aggregate storage, the belt type transporter, the arrangement of the cement and the means for measuring and discharging the aggregate, and the like are compact, and at the same time, the arrangement of the mixer and the sprayer is also compact. for that reason,
The space required for the preparation of spray mortar raw material consisting of a mixture of cement and aggregate, the preparation of mortar which is a mixture of cement, aggregate and water, etc. becomes small, and the preparation of spray mortar raw material and the preparation of mortar at the construction site are possible. It will be easier. (D) When the ratio of the volume of the cement storage to the volume of the aggregate storage is set to a value that can correspond to the normal cement-aggregate ratio, the remainder of the cement and the aggregate can be eliminated. Therefore, the deterioration of cement and the change of water content of aggregate are eliminated, and a mortar in which a desired cement-aggregate ratio and cement-water ratio are sufficiently mixed can be easily prepared. (E) As described in claim 5, the water content of the aggregate or the aggregate contained in the aggregate reservoir is measured in advance, and the aggregate is continuously introduced into the nozzle device according to the moisture content of the aggregate. If the amount of water to be sprayed is determined and the cement water ratio is substantially constant, a mortar having a cement water ratio with less variation can be easily prepared, the rebound rate can be reduced, and the spraying workability can be improved. (F) In the dry spraying apparatus according to claim 6, since the cement storage, the aggregate storage, the carrier and the mixer are attached to the machine body, preparation of the spraying mortar raw material composed of the mixture of cement and aggregate, cement, The space required for the preparation of mortar, which is a mixture of aggregate and water, etc., becomes small, and a dry spraying device suitable for a narrow construction site can be obtained. (G) According to claim 7, the construction of the carry-out machine is simplified for carrying out the metered-carry-out of cement and aggregate, and the cement store, the aggregate store, the belt type carrier, the mixer and the carry-out are carried out. The layout of machines, etc. is made compact, and at the same time, the layout of the mixer and spray machine is also made compact, and the space occupied by equipment such as preparation of spray mortar raw material and mortar can be further reduced, making it a narrow construction site. It is possible to provide a dry spraying device suitable for a low cost.

[Brief description of drawings]

FIG. 1 is a front view showing an overall outline of a dry spraying device used for carrying out a dry spraying method of an embodiment.

[Fig. 2] Cement storage of dry spraying device, aggregate storage,
Plan view of belt type conveyor and mixer

FIG. 3 is a front view of the one shown in FIG.

FIG. 4 is a front view of a cement storage device and a belt type transfer device of a dry spray device.

FIG. 5 is a front view showing a part of a measuring screw device of a cement storage device in section.

FIG. 6 is a side view showing a cross-section of the centering screw device and the like of the cement storage device.

FIG. 7 is a side view of a carry-out machine for carrying out the measurement using the gate plate of the aggregate storage device.

FIG. 8 is a front view of a mixer with a cross section of a main part.

FIG. 9 is a front view of the spraying machine cut vertically.

FIG. 10 is a plan view of the spraying machine taken along the line AA of FIG. 11 and viewed in the direction of the arrow.

FIG. 11 is a front view in which a portion including a supply pipe and a discharge pipe of the spraying machine is longitudinally shown.

FIG. 12 is a front view of a nosle device with a main part cut longitudinally.

FIG. 13 is a BB of the blow-off tube fitted with the throttle ring of FIG.
Side view taken along the line and seen in the direction of the arrow

FIG. 14 is a view showing an outlet pipe fitted with a throttle ring of FIG.
Side view taken along the line and seen in the direction of the arrow

[Explanation of Codes] 10 Dry spraying device 1 Airframe 2 Cement storage device 2A Centering screw device 2B Measuring screw device 3 Aggregate storage device 3A Weighing and discharging mechanism 3d Gate plate 4 Belt type conveyor 4a Belt 5 Mixer 5A Cylindrical body 5B Mixing shaft 5C Angle adjuster 5s Discharge port 6 Spraying machine 6A Receiving part 6B Loading device 6C Pressure air chamber 6D Unloading device 7 Air feeding hose 8 Nozzle device 8A Nozzle pipe 8i Open / close valve 8m Injection hole 8n Mixing passage 9 Blowing pipe 9c Throttle Ring 20 units 21 Construction part 23 Belt conveyor cw Chain wheel ch Chain M _{1 to} M ₅ Motor Sa High pressure air supply source Sw High pressure water supply source

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Arihiro Muta, 4-2-20 Tenjin, Chuo-ku, Fukuoka City Stock Company, Takenaka Corporation Kyushu Branch (72) Inventor Hitoshi Aritsu 4-chome, Tenjin, Chuo-ku, Fukuoka 2-20 No. 20 Stock Company Takenaka Corporation Kyushu Branch (72) Inventor Shigeki Sugigami 351 Hayashi-cho, Takamatsu City 23 Sugiue Engineering Co., Ltd.

Claims (7)

[Claims] 1. Cement is continuously weighed out from a cement store, and aggregate is continuously weighed out from an aggregate store so that a desired cement-aggregate ratio is obtained, and continuously weighed out. The cement and aggregate are continuously carried into the mixer by a carrier, and the cement and aggregate carried into the mixer are continuously stirred and mixed in the mixer to be a sprayed mortar raw material, while the sprayed mortar raw material is used. From the mixer to the spraying machine continuously, the spraying mortar raw material carried into the spraying machine is continuously mixed with the high pressure air in the spraying machine, and the spraying mortar raw material mixed with the high pressure air is passed through the air feeding pipe to the nozzle device. Continuously carried into the mixing zone, the jet water stream consisting of water having a desired cement water ratio is continuously jetted into the mixing zone of the nozzle device, and the jet stream and the sprayed mortar raw material in the mixing zone. Continuously Dry spraying characterized by continuously mixing and contacting to form mortar, which is a mixture of cement, aggregate and water, and placing the mortar on a high-speed air stream and continuously spraying it on a construction part such as a wall. Construction method. 2. A cement store, an aggregate store, a carrier and a mixer are attached to the machine body, and the cement is continuously metered from the cement store so as to obtain a desired cement-aggregate ratio. The aggregate and aggregate from the aggregate storage device while continuously delivering them to the conveyor, and the cement and aggregate that are continuously delivered to the conveyor are continuously incorporated into the mixer by the conveyor. Then, while continuously stirring and mixing the cement and the aggregate in a mixer to form a sprayed mortar raw material, the sprayed mortar raw material is continuously discharged from an outlet of the mixer and continuously discharged from the mixer. The spraying mortar raw material is continuously received by the receiving part of the spraying machine, the mortar raw material is mixed with high pressure air by the spraying machine, and the mortar raw material mixed with the high pressure air is passed through the pneumatic pipe to the mixing area of the nozzle pipe of the nozzle device. Bring in and get the desired cement water ratio A jet of water consisting of water of a certain amount of water is continuously jetted into the mixing area of the nozzle pipe of the nozzle device, and the jet of water and the sprayed mortar raw material are continuously contact-mixed in the mixing region of the nozzle pipe of the nozzle device, and continuously. Then cement,
A dry spraying method, characterized in that mortar, which is a mixture of aggregate and water, is prepared, and the mortar is placed on a high-speed air stream and continuously sprayed onto a construction site such as a wall. 3. A cement store and an aggregate store are provided on the upper side of the machine body, and a belt-type carrier is provided on the lower side of the cement store and the aggregate store so as to extend in the longitudinal direction of the machine body. A mixer is installed on the front side of the machine body with its front part inclined upward, and the belt of the belt type conveyor is continuously measured while measuring the aggregate from the aggregate storage so that the desired cement-aggregate ratio is obtained. Carry out the above, continuously carry out the cement from the cement storage onto the belt while measuring it, and carry the cement and aggregate on a belt type carrier to continuously convey the cement toward the mixer. And the aggregate is continuously dropped from above the belt into the carry-in port at the rear part of the mixer, and the cement and the aggregate are continuously stirred and mixed by the mixer to be the sprayed mortar raw material, while the sprayed mortar raw material is mixed. From the front outlet of the Then, the sprayed mortar raw material dropped from the mixer is continuously received by the receiving portion of the sprayer, the mortar raw material is mixed with the high pressure air by the sprayer, and the mortar raw material mixed with the high pressure air is passed through a pneumatic pipe to a nozzle device. Into the mixing zone, the jet water stream consisting of water having a desired cement water ratio is continuously jetted into the mixing zone, and the jet stream and the sprayed mortar raw material are continuously fed in the mixing zone of the nozzle device. A dry spraying method characterized in that mortar, which is a mixture of cement, aggregate and water, is continuously mixed by contact, and the mortar is placed on a high-speed air stream and continuously sprayed on a construction part such as a wall. . 4. The ratio of the volume of the cement store to the volume of the aggregate store is set to a value that can correspond to a normal cement-aggregate ratio, according to any one of claims 1 to 3. Dry spray method. 5. The water content of the aggregate or the aggregate put in the aggregate reservoir is measured in advance, and the aggregate is continuously sprayed into the mixing area of the nozzle device according to the water content of the aggregate. The dry spraying method according to any one of claims 1 to 4, wherein the amount of water is determined and the cement water ratio is made substantially constant. 6. A cement store and an aggregate store are provided on the upper side of the machine body, a carry-out device for weighing out cement is provided at the bottom of the cement store, and an aggregate is carried out at the bottom of the aggregate store. A carrying-out machine for carrying out is provided, and a belt-type carrying machine is provided so that the belt extends in the front-rear direction of the fuselage below the cement storage and aggregate storage, and the belt is carried out at the carry-out port of the carry-out machine of the cement storage and The mixer is installed on the front side of the machine, facing the carry-out port of the carry-out machine of the aggregate storage, the carry-in inlet of the rear of the mixer is facing the carry-out section of the front of the belt-type carrier, and the receiving section of the spraying machine. The spraying machine is arranged so that is located below the discharge port at the front of the mixer, and the carry-out section of the spraying machine is connected to the nozzle device via the pneumatic tube. 7. A cement storage device is provided on the front side above the machine body, a carry-out device for measuring and discharging cement is provided at the bottom of the cement storage device, and an aggregate storage device having an opening at the bottom is provided. Provided on the rear side above the fuselage, the belt type conveyor is provided so that the belt extends in the front-rear direction of the fuselage below the cement storage and aggregate storage, and the belt is provided at the bottom of the aggregate storage. The unloading that faces the opening and faces the unloading port of the unloader of the cement storage, and controls the metered unloading amount of the aggregate by adjusting the gap between the lower edge of the gate plate and the upper surface of the belt on the front side of the aggregate storage. Machine, the mixer is installed on the front side of the machine with its front part inclined upward, the carry-in inlet of the mixer is located below the carry-out part of the front part of the belt type conveyor, and the receiving part of the spraying machine is Blow so that it is below the outlet on the front of the mixer. The machine is arranged, a dry spray device being characterized in that connecting the discharge portion of the sprayer to the nozzle device via a pneumatic tube.