KR100704794B1 - Device for spraying mortar or concrete, and method of spraying mortar or concrete by using the device - Google Patents

Abstract

The present invention provides a mortar or concrete spraying apparatus and a mortar or concrete spraying method using the apparatus, which enable smooth and reliable spraying of mortar or concrete even with long-distance conveying.

A mortar or concrete spraying device for separately mixing and spraying aggregate and cement milk constituting mortar or concrete, comprising: an aggregate feeder for transporting the aggregate, and a conveying pipe connected to the aggregate feeder; An aggregate feeder is provided in a state in which a container for accommodating aggregate is provided and in communication with the inside of the container through a communication hole at a lower side of the container, and a discharge part to which the conveying pipe is connected, is provided on the bottom wall of the container from within the container. The aggregate dropped to the said sending part through the installed communication port is sent out in a conveying pipe, and the mortar or concrete spraying apparatus characterized by being comprised so that the opening area of the said communication hole may be less than or equal to the flow path area in the said conveying pipe.

Mortar, cement milk, conveying, aggregate, container, communication, feeding, conveying, spraying, flow path

Description

Mortar or concrete spraying device and mortar or concrete spraying method using the device {DEVICE FOR SPRAYING MORTAR OR CONCRETE, AND METHOD OF SPRAYING MORTAR OR CONCRETE BY USING THE DEVICE}

The present invention relates to a mortar or concrete spraying apparatus and a mortar or concrete spraying method using the apparatus.

When the mortar or concrete is sprayed to form a lattice-shaped slanted frame by spraying mortar or concrete on a mold previously formed on the surface of a height, water and cement are aggregated in advance to form an injection material, and the carrier pipe is used to In the conventional mortar or concrete spraying device for conveying the spraying material, the ejection resistance (pressure) of the spraying material is so large that the ejection resistance (pressure) of the spraying material passing through the conveying pipe is very large, and therefore, the height of the spraying construction and the particles Spray construction using a large diameter aggregate was difficult or impossible.

Therefore, the present applicant, as disclosed in Patent Document 1 below, to efficiently carry out spraying construction using higher aggregates or larger aggregates, separately compresses cement milk and aggregates constituting mortar or concrete. A separate injection type injection device is being developed.

The separate injection-type injection device, for example, moves the mortar or concrete by moving the sand as aggregate to the conveying pipe of about 400m in length by compressed air and mixing it with cement milk at the place just before the injection nozzle about 10m. And a worker supported by a life rope holds the spray nozzle and sprays mortar or concrete against the mold to form a grid-like warp frame.

According to the said separate injection injection apparatus, since cement milk and aggregate are separately conveyed to the immediate vicinity of an injection nozzle, the discharge resistance (pressure) can be made larger because the pressure resistance of the aggregate in the said conveyance pipe becomes small, It is possible to spray mortar or concrete at a high position, or to spray with aggregate having a large particle diameter.

Patent Document 1: Japanese Patent Application Laid-Open No. 2001-248164

Patent Document 2: Japanese Utility Model Registration No. 2509314

However, in the mortar or concrete spraying apparatus of the separate feeding method, aggregates before and after mixing with cement milk are easily clogged in the conveying pipe, and there is a problem that spraying cannot be performed smoothly.

Applicants believe that one of the causes of the blockage is an aggregate feeder for conveying the aggregate. That is, the aggregate mortar or injector (civil injector) as disclosed in the patent document 2 was used as the mortar or concrete spraying apparatus, in which the spray material is transferred from the lower container to the pressure feeder in the aggregate conveyer. It is considered that the injection material to be pumped into the pressure feed pipe (conveyor pipe) pulsates because the amount of 하지 is not constant, and this pulsation causes the blockage.

In addition, as a cause of the clogging that can be considered elsewhere, in the mortar or concrete spraying device, when cement milk is added to aggregate flowing through the conveying pipe, the volume and weight of the flowing aggregate rapidly increase and the conveyance speed decreases. As a result, it is conceivable that the carrier pipe is blocked by the aggregate and the cement milk.

Therefore, the mortar or concrete cannot be transported and sprayed to a place where the carrying of the machine is restricted, such as near the mountain top of a rugged mountain part, and the surface in such a place is left without construction for the protection of the surface using mortar or concrete. there was.

The present invention has been made in consideration of the above-described circumstances, and an object thereof is a mortar or concrete spraying apparatus and a mortar or concrete spraying method using the apparatus, which enable the smooth and reliable spraying of mortar or concrete even after long-distance conveying. To provide.

In order to achieve the above object, the mortar or concrete spraying apparatus of the present invention is a mortar or concrete spraying apparatus for separately spraying the aggregate and cement milk constituting the mortar or concrete, and then sprayed by mixing, for transporting the aggregate An aggregate feeder, and a conveying pipe connected to the aggregate feeder, wherein the aggregate feeder is installed in a state in communication with the container interior through a container for accommodating aggregate, and a communication port at a lower side of the container; And the aggregate connected to the said sending part through the communicating port provided in this container, and passing through the communicating port provided in the bottom wall of the container to the said sending part, and the opening area of the said communicating port is less than the flow path area in the said conveying pipe. It is configured to be (claim 1).

In addition, it is preferable that the obturator is disposed below the bottom wall of the container so as to close a part of the communication port (claim 2).

In addition, a mortar or concrete spraying device for separately mixing and spraying the aggregate and cement milk constituting the mortar or concrete, comprising an aggregate feeder for transporting the aggregate and a conveying pipe connected to the aggregate feeder A first opening / closing means in which the aggregate pressure feeder is opened and closed with the upper container and the lower container, and is switched to a state in which the inside of the upper container communicates with the outside and is isolated from the outside, and the opening and closing between the upper container and the lower container. 2 is provided in a state of communicating with the inside of the lower container through the opening and closing means, the communication port in the lower side of the lower container, supplying the compressed air to the delivery unit to which the conveying pipe is connected, the upper container, the lower container and the delivery unit After pressurized air supply means for stirring the aggregate in the upper container, The aggregate in the upper container is dropped into the lower container by introducing the compressed air into the inside of the upper container with the first and second opening and closing means closed, and opening the second opening and closing means, and then lower side of the lower container. Aggregate dropped to the said sending part from the communicating port installed in the delivery pipe is sent to the conveying pipe, and it is conveyed downstream by the compressed air from the said compressed air supply means, and it is lowered through the compressed air flow path from the said compressed air supply means. In order to suppress the fluctuation | variation of the pressure of the compressed air conveyed to a container, you may provide a backflow prevention valve in the middle of the compressed air flow path connected to the lower container (claim 3).

In addition, a mortar or concrete spraying device for separately mixing and spraying the aggregate and cement milk constituting the mortar or concrete, the cement milk delivery pipe for conveying the cement milk, and the conveying pipe for conveying the aggregate The said conveying pipe has a cement milk introduction part to which the downstream end of the said cement milk delivery pipe is connected, and it is comprised so that the inner diameter of the downstream part may become larger than the inner diameter of the upstream part than this cement milk introduction part. (Claim 4).

In addition, a mortar or concrete spraying device for separately mixing and spraying the aggregate and cement milk constituting the mortar or concrete, the cement milk delivery pipe for conveying the cement milk, and the conveying pipe for conveying the aggregate The said conveying pipe has a cement milk introduction part to which the downstream end of the said cement milk delivery pipe is connected, The tapered type which the internal diameter becomes large by the downstream side is formed, and the tapered type is formed in this cement milk introduction part. The cement milk delivery pipe may be connected to the portion such that the direction in which the aggregate flows and the direction in which the cement milk flows are acute at the longitudinal section (claim 5).

In addition, as a mortar or concrete spraying device for separately transporting the aggregate and cement milk constituting the mortar or concrete, and mixed and sprayed, the nozzle portion is provided at the downstream end of the conveying pipe for conveying the mixed aggregate and cement milk, This nozzle portion has an enlarged portion whose inner diameter increases from the upstream side to the downstream side and a tightening portion whose inner diameter becomes smaller by the downstream side, and the inner diameter of the downstream end of the tightening portion is equal to or slightly smaller than the inner diameter of the conveying pipe. It may be configured to be large (claim 6).

The mortar or concrete spraying method of Claim 7 injects mortar or concrete using the spraying device in any one of Claims 1-6.

1 is an explanatory view schematically showing the configuration of a mortar or concrete spraying apparatus according to an embodiment of the present invention.

2 is an explanatory view schematically showing a configuration of an aggregate feeder in the embodiment.

3 is an exploded perspective view schematically showing the configuration of the stirring blades of the upper container in the embodiment.

4 is an exploded perspective view schematically showing the configuration of the stirring blades of the lower container in the embodiment.

5 (A) and 5 (B) are explanatory diagrams schematically showing a configuration of a modified example and another modified example of the occluded body in the above embodiment.

6 (A) and (B) are longitudinal sectional views and explanatory diagrams schematically showing the configuration of the cement milk introduction portion in the embodiment.

7 is an explanatory view schematically showing a configuration of a modification of the cement milk introduction unit.

8 is an explanatory diagram schematically showing a configuration of a nozzle unit in the embodiment.

9 is an explanatory diagram schematically showing a configuration of the spray inclined frame method using the spray apparatus.

10 is an explanatory view schematically showing a configuration of main parts of the injection inclined frame method.

11 (A) to (C) are explanatory diagrams schematically showing the configuration of a rock bonding method using the spray device.

It is explanatory drawing which showed schematically the structure of an example of the tunnel formation construction which uses the said injection apparatus.

<Description of the code>

1 aggregate 2 aggregate pump

6: cement milk 8: conveying pipe

11: container 14: communication port

15: delivery unit D: injection device

M: Mortar

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of this invention is described with reference to drawings.

1 is an explanatory diagram schematically showing the configuration of a mortar or concrete spraying apparatus (hereinafter referred to as spraying apparatus) D and a method according to an embodiment of the present invention.

The injection device D is an aggregate feeder 2 as an aggregate supply means for supplying aggregate (sand (grain aggregate) in the case of mortar (M), and sand and crushed stone (coarse aggregate) in the case of concrete) 1. And a cement milk dispensing means for dispensing the air compressor 3 as the compressed air supply means connected to the aggregate feeder 2, and the cement milk 6 formed by mixing the cement 4 and the water 5 with each other. Cement milk for mixing the mortar (M) (or concrete) in the middle portion of the pump for pumping (for example, a piston pump, a squeeze pump) 7 and a downstream side of the aggregate feeder 2. The upstream end is connected to the conveyance pipe 8 in which the introduction part 9 is provided, and the downstream side of the said pressure feed pump 7, and through the cement milk introduction part 9 in the downstream part of the said conveyance pipe 8. The cement milk delivery pipe 10 connected to the downstream end is provided.

The injection device D separately pumps the aggregate 1 and the cement milk 6 separately and mixes both 1 and 6 immediately before performing injection from the downstream portion of the conveying pipe 8. It is of the feeding type.

The aggregate feeder 2 discharges the aggregate 1 downstream with the compressed air (also referred to as compressed air or high pressure air) supplied from the air compressor 3, and the aggregate discharged as described above. (1) is led into the said conveyance pipe 8, and is conveyed to the downstream side of the conveyance pipe 8 by the said high pressure air.

2 is an explanatory view schematically showing the configuration of the aggregate feeder 2.

In addition, the aggregate feeder (2) is a container 11 having an upper container (11a) and a lower container (11b) for accommodating aggregate, and the state in which the inside of the upper container (11a) communicates with the outside by opening and closing A first opening / closing means (for example, an opening and closing plate) 12 switched to a state isolated from the second container, a second opening and closing means (for example, an opening and closing plate) 13 for opening and closing between the upper container 11a and the lower container 11b; It is installed in the state communicating with the inside of the container 11 (lower container 11b) via the communication port 14 below the container 11 (lower container 11b), and the said conveyance pipe 8 is connected. It has a sending part 15 which becomes.

The pressurized pipe 16 as a pressurized air flow path for pressurizing the inside of the upper container 11a by introducing compressed air from the air compressor 3 into the upper container 11a, and air in the upper container 11a. An air bleeding pipe 17 is connected to the outside to reduce the pressure, and an injection hopper 18 and the first opening / closing means 12 for introducing the aggregate 1 to the upper portion of the upper container 11a. Is installed. In addition, the stirring blade 19 for stirring the aggregate 1 accommodated in the upper container 11a is provided.

The upstream end of the pressurized pipe 16 is connected to the air compressor 3, in the middle of which the compressed air from the air compressor 3 is supplied into the upper container 11a on the downstream side, and in a state of not being supplied. Switching means (for example, a switching valve) 16a for switching to the switch is provided.

The air bleeding pipe 17 has a switching means (for example, a switching valve) 17a for switching the air in the upper container 11a to a state which draws out to the outside and a state which does not draw out.

3 is an exploded perspective view schematically showing the configuration of the stirring blade 19.

The stirring blade 19 is provided with the rotating shaft body 20 which rotates in the axial direction, and the two blades 21 and 21 fixed to this rotating shaft body 20. As shown in FIG.

The blade 21 has a fixed portion 22 having a cross-section fixed to the rotating shaft body 20 in the form of a "へ", two arm portions 23 and 23 provided in succession to the fixed portion 22 and And an arc-shaped portion 24 provided at the ends of the arm portions 23 and 23.

The arc-shaped portion 24 has a first arc portion 24a which is provided at the ends of the arm portions 23 and 23, and a second arc portion (of substantially the same shape as the first arc portion 24a). 24b) and a first one larger than the first circular arc portion 24a and the second circular arc portion 24b, and are sandwiched and supported by the first circular arc portion 24a and the second circular arc portion 24b. 3 arc part 24c is provided. The third arc portion 24c, which is in direct contact with the inner wall of the upper container 11a, is formed of a material having some elasticity such as rubber.

Meanwhile, the fixing of the fixing portion 22 to the rotating shaft 20 and the fixing of the three circular arc portions 24a, 24b, and 24c are, for example, bolts 34b for screwing through the C ring 34a and This can be done using the nut 34c.

In the lower container 11b, a pressurized pipe 25 serving as a compressed air flow path for introducing compressed air from the air compressor 3 to pressurize the inside of the lower container 11b and in the lower container 11b. An air bleed pipe 26 for drawing air out and decompressing the air is connected, and the upper container 11a is connected to the upper part of the lower container 11b via the second opening / closing valve 13. In addition, the stirring blade 27 for stirring the aggregate 1 accommodated in the inside of the lower container 11b is provided.

The upstream end of the pressurized pipe 25 is connected to the air compressor 3, and in the middle thereof, the compressed air from the air compressor 3 is supplied into the lower container 11b on the downstream side, and the state is not supplied. Switching means (for example, switching valve) 25a and a non-return valve (not shown) are provided for switching to.

The air bleed pipe 26 has a switching means (for example, a switching valve) 26a for switching the air in the lower container 11b to the state which draws out to the outside and the state which does not draw out.

4 is an exploded perspective view schematically showing the configuration of the stirring blade 27.

The stirring blade 27 is provided with the rotating shaft body 28 which rotates in the axial direction, and the two blade | wings 29 and 29 fixed to this rotating shaft body 28. As shown in FIG.

The rotary shaft 28 is provided at both ends with arm portions 30 and 31 connected to each other, and the arm portion 30 provided at one end and the arm portion 31 provided at the other end have the rotary shaft 28 interposed therebetween. Placed on the opposite side. In addition, the two arm parts 32 and 33 are provided in the center part of the rotating shaft body 28 so that the opposite side may be provided with the rotating shaft body 28 interposed therebetween. In addition, one wing 29 is fixed in a curved state from the arm portion 30 to the arm portion 32, and the other wing 29 is the arm portion (33) in the arm portion (33) It is fixed in the state curved over 31).

The wings 29 are formed with the first curved portion 29a and the first curved portion 29a which are installed to be connected to the ends of the arm portions 30 and 32 (or arm portions 33 and 31), respectively. The second curved portion 29b having the same shape, and the first curved portion 29a and the second curved portion 29b are formed to be one turn larger, and the first curved portion 29a and the second curved portion ( 29b), the 3rd curved part 29c inserted and supported is provided. The third curved portion 29c which is in direct contact with the inner wall of the lower container 11b is formed of a material having some elasticity such as rubber.

Meanwhile, the fixing of the three curved portions 29a, 29b, and 29c may be performed using, for example, a bolt 34b and a nut 34c that are screwed through the washer 34a.

Moreover, the obstruction body 35 is arrange | positioned under the bottom wall of the said container 11 (lower container 11b) so that a part of said communication port 14 may be closed. The obturator 35 is a plate-shaped member provided with a through hole 35a such as a circle in the center, and is equal to or smaller than the flow path area (inner cross-sectional area), specifically, 1/4 to the channel area (inner cross-sectional area). To have a cross-sectional area).

For example, when the cross section of the flow path formed in the said conveyance pipe 8 is circular shape, and the inner diameter is 42 mm, the said communication hole 14 is circular shape and the diameter is 69 mm, The diameter of the through hole 35a can be 24 mm.

A pressurized pipe 36 for transferring compressed air from the air compressor 3 is connected to an upstream end of the delivery section 15 or the conveying pipe 8 connected to the delivery section 15.

In addition, the aggregate feeder 2 is placed on the moving trolley 37.

In addition, the aggregate feeder 2 has pressure gauges 38 and 38 for measuring and displaying the pressure inside the upper container 11a and the lower container 11b.

Next, operation | movement of the aggregate pressure feeder 2 which consists of said structure is demonstrated.

(1) First, the first opening / closing means 12 is opened, and the aggregate 1 is introduced into the upper container 11a from the feeding hopper 18. At this time, the 2nd opening-closing means 13 is made to be closed, and the aggregate 1 is accommodated in the lower container 11b. As described above, the aggregate 1 introduced into the upper container 11a is stirred by the stirring blade 19.

(2) And when the said 1st opening-closing means 12 is closed and the aggregate 1 in the said lower container 11b is thrown in to the delivery part 15, and the residual amount becomes a little less, (3) the air bleeding out The switching means 17a provided in the pipe 17 are closed, and the switching means 16a provided in the pressurizing pipe 16 are opened to open the compressed air from the air compressor 3 to the upper container ( 11a) is introduced into the upper container 11a.

Then, when the pressure in the upper container 11a is substantially equal to the pressure in the lower container 11b which is pressurized in advance, (4) the said switching means 16a is made into the closed state, and in the upper container 11a, The introduction of the compressed air from the air compressor 3 is stopped, and the second opening / closing means 13 is opened to inject the aggregate 1 in the upper container 11a into the lower container 11b.

Then, when the input of the aggregate 1 from the upper container 11a to the lower container 11b ends, (5) the second opening / closing means 13 is closed, and the switching means of the air bleed pipe 17 ( 17a) is opened, the air in the upper container 11a is drawn out, and the pressure in the upper container 11a is returned to the same state as the external pressure. The state in which the input of the aggregate 1 into the container 11a can be performed again.

After the said operation, it returns to operation of said (1) again, and it is set as the structure in which the aggregate 1 is continuously conveyed by repeating the operation of said (1)-(5) in the said aggregate feeder 2.

On the other hand, in the lower container 11b into which the aggregate 1 is put from the upper container 11a, while the aggregate 1 is stirred by the stirring blade 27, the communication provided in the bottom wall of the lower container 11b. Aggregate 1 is dropped from the sphere 14 to the discharge unit 15. And the aggregate 1 dropped to the delivery part 15 is sent out in the said conveyance pipe 8, and is conveyed to the downstream side.

In the aggregate feeder 2 having the above-described configuration, the aggregate 1 in the lower container 11b guided to the outlet port 14 by the stirring blade 27 is lowered from the communication port 14. It is injected into the delivery unit 15, the obstruction body 35 is disposed below the communication port 14, the opening area of the communication port 14 is the flow path area (inner cross-sectional area) in the conveying pipe (8). Hereinafter, since it is comprised so that it may become about 1/4-flow path area (inside cross-sectional area) of the flow path area (inner cross-sectional area) in detail, the aggregate 1 of the quantity below the limit of the conveyance force of the said conveyance pipe 8 is lowered. A large amount of aggregate 1 which can flow quantitatively from the container 11b to the delivery part 15 and exceeds the limit of the conveyance force of the said conveyance pipe 8 as conventionally into the conveyance pipe 8 at once. It is possible to reliably prevent the flow of water and causing clogging and pulsation in the conveying pipe 8.

In addition, in the aggregate feeder 2, the obstruction body 35 which blocks a part of the communication port 14 is arranged below the communication port 14, and accordingly, the aggregate ( Since 1) forms the pooling part which gathers, the introduction of the aggregate 1 in the lower container 11b to the communication port 14 does not become intermittent by the rotation of the said stirring blade 27, but the stirring blade 27 Since the aggregate 1 collected at the pool portion continues to flow into the delivery section 15 even while the aggregate 1 is not introduced into the communication port 14 by the cross section 1, the continuity of conveyance of the aggregate 1 is maintained. It can improve and it is very effective at preventing clogging in the conveyance pipe 8 and the pulsation of the aggregate 1.

As shown in FIG. 5A, when the inclination is formed so that the portion closer to the through hole 35a is located at the lower portion of the obturator 35, the obstruction portion of the obturator 35 is formed. Aggregated aggregate 1 is more likely to fall to the downward delivery part 15, and the continuity of conveyance of aggregate 1 is improved more.

Moreover, in the aggregate feeder 2 which consists of said structure, since the backflow prevention valve is provided in the said pressure pipe 25, the following effects are acquired. That is, since the pressure of the upper container 11a, the lower container 11b, and the conveying pipe 8 (for conveying compressed air) is one air compressor 3, the pressure applied to the upper container 11a. (Or compressed air flow rate to transfer to the upper container 11a) A, pressure (or compressed air flow rate to transfer to the lower container 11b) to the lower container 11b, B, conveying pipe 8 or delivery unit If the pressure applied to the (15) (or the compressed air flow rate delivered to the conveying pipe 8 or the delivery section 15) is C, the total pressure (total flow rate of the compressed air) applied by the air compressor 3 is It becomes A + B + C. Here, it is preferable that each air is equipped with an air chamber (not shown) in the aggregate pressure feeder 2, and is supplied through this air chamber.

Then, in the operation of (3), when the compressed air starts to be transferred from the air compressor 3 to the upper container 11a in order to increase the pressure in the upper container 11a, the pressurization connected to the lower container 11b is performed. Since the pipe 25 and the pressurized pipe 16 connected to the upper container 11a communicate with each other, the pressure B in the lower container 11b when the backflow prevention valve is not provided in the pressurized pipe 25. ) Is greater than the pressure A in the upper container 11a, the compressed air in the lower container 11b flows into the upper container 11a via the pressurizing pipes 25 and 16, and the pressure in the lower container 11b. The fall occurs, and this causes a decrease in the discharge amount of the aggregate 1 carried out from the lower container 11b, leading to a decrease in the conveying force of the aggregate 1 or a non-uniformity of the formed mortar or concrete. However, as described above, the pressure pipe 25 is connected to the lower container 11b so as to suppress fluctuations in the pressure (flow rate) of the compressed air transferred from the air compressor 3 to the lower container 11b. Since the non-return valve is provided, it is possible to prevent the compressed air in the lower container 11b from flowing into the upper container 11a, thereby maintaining a large conveying force of the aggregate 1 and allowing stable continuous conveying. In addition, clogging and pulsation can be prevented from occurring in the conveying pipe 8 even with such a configuration, and non-uniformity can be prevented from occurring in the quality of the formed mortar or concrete.

On the other hand, in order to achieve more uniform conveyance of the aggregate 1, the opening area (opening total area) of the communication port 14 is made as small as possible, and the number of the blades 29 of the stirring blades 27 is increased. It is preferable.

In addition, in the aggregate feeder 2, since the opening area of the communication port 14 is larger than the flow passage area (inner cross-sectional area) in the conveying pipe 8, in order to reduce the opening area, the obturator 35 Although not limited to this configuration, the communication port 14 itself is made smaller, and the opening area thereof is smaller than the flow path area (inner cross-sectional area) in the conveying pipe 8, in detail, the flow path area (inner cross-sectional area). You may comprise so that it may become about 1/4-channel area (internal cross-sectional area) of ().

The number of the communication ports 14 is not limited to one, and may be a plurality. In this case, the total area of the openings of the communication ports 14, 14... Is less than or equal to the flow path area (inner cross-sectional area) in the conveying pipe 8, specifically, 1/4 to the flow path area ( Internal cross-sectional area), and when the total area is excessively large, a part of the plurality of communication ports 14, 14...

In addition, as described above, the obturator 35 is not limited to a plate-shaped member provided with a circular through hole 35a at the center thereof. For example, the obturator 35 may be formed by a general plate-like member having no through hole 35a. The obturator 35 may be configured, and the obturator 35 may be disposed so as to close a part of the communication port 14 as shown in FIG. 5 (B). Of course, a part of the communication port 14 may be blocked by using a plurality of the obstructing bodies 35 having the above configuration.

The said conveyance pipe 8 is the connection hose part 8a which connects the hose which has a some flexibility about 20m, for example, and the said cement milk introduction part 9 provided in the downstream of this connection hose part 8a. And a nozzle portion 39 provided on the downstream side of the cement milk introduction portion 9 and for discharging the aggregate 1 mixed in the cement milk introduction portion 9 and the cement milk 6.

On the other hand, as the conveying pipe 8, it is possible to use a general mortar or concrete spraying hose, for example. In addition, the distance from the conveying pipe 8 to the cement milk introduction portion 9 to the nozzle portion 39 is a length necessary for the aggregate 1 and the cement milk 6 to be sufficiently mixed, for example, 1 to 20 m ( Preferably it is comprised so that it may become about 3-10m).

The connecting hose part 8a is configured to have a length of, for example, about 100 m, but may be 700 m at a horizontal distance on a flat sheet, 200 m at a straight height on a slope, and about 400 m at a horizontal distance.

The inner diameter of the portion on the downstream side of the conveying pipe 8 (connection hose portion 8a) is larger than the inner diameter of the portion on the upstream side (Fig. 6 (A)). Reference). For example, the inner diameter of the upstream part of the said conveyance pipe 8 (connection hose part 8a) may be 42 mm, and the inner diameter of the downstream part may be 50 mm, and the said conveyance pipe 8 (connection hose part 8a) The inner diameter of the portion on the upstream side of)) may be 38 mm and the inner diameter of the portion on the downstream side of 42 mm.

The cement milk delivery pipe 10 is formed such that its inner diameter is, for example, about 1 to 3 cm, and the downstream portion is divided into two branches. On the other hand, this downstream portion may not necessarily be divided into two parts, and the cement milk delivery pipe 19 may be used when the cement milk (mortar milk) 6 is hardened (for example, when working in a high temperature environment). Sometimes it is desirable not to split the downstream part of

6 (A) and 6 (B) are longitudinal sectional views and explanatory diagrams schematically showing the structure of the cement milk introduction portion 9. The cement milk introduction part 9 is for mixing the cement milk 6 flowing into the cement milk delivery pipe 10 with the aggregate 1 flowing in the conveying pipe 8, and the connecting hose part ( It is arrange | positioned in the state interrupted in the middle of 8a), and has comprised substantially cylindrical shape. On the other hand, the cement milk introduction portion 9 is made of metal such as aluminum, for example.

In detail, the said cement milk introduction part 9 is provided with the tapered part 9a which enlarges an internal diameter by the downstream side. On the other hand, as shown in Fig. 6A, the cement milk introduction portion 9 in this embodiment is formed as a tapered portion 9a whose inner diameter becomes larger by the downstream side.

As shown in FIG. 6A, with respect to the tapered portion 9a of the cement milk introduction portion 9, the direction in which the aggregate 1 flows and the direction in which the cement milk 6 flows are acute (eg Each downstream part of the said cement milk delivery pipe 10 is connected so that it may become 10-40 degreeC, Preferably it is 15-30 degreeC. And further, the cement milk delivery pipe 10 so that the cement milk 6 flowing into the conveying pipe 8 draws a spiral along the inner wall of the conveying pipe 8 as shown in FIG. 6 (B). Each downstream part of is angled with respect to the said tapered part 9a, and is connected.

Here, the mortar (M) (or concrete) is formed by mixing the cement milk (6) and the aggregate (1) in the cement milk inlet (9), the cement (M), cement (4), aggregate ( It is preferable to have a weight compounding ratio of, for example, cement (4): aggregate (sand): water (5) = 1: 4: 0.45 to 0.6 using sand) 1, water 5 and a suitable admixture. In the case of concrete, part of the sand is replaced with crushed stone as appropriate.

On the other hand, the cement milk introduction portion 9 is not limited to being formed as a tapered portion 9a whose internal diameter is increased by the downstream side thereof, and may have a portion of the tapered portion 9a. For example, as shown in FIG. 7, you may have the said tapered part 9a and the reverse tapered part 9b which internal diameter becomes small by the downstream side in order from an upstream side.

In addition, it is preferable to line the inner surface of the cement milk introduction portion 9 with wear-resistant rubber or synthetic resin to reduce wear caused by the aggregate 1.

8 is an explanatory diagram schematically showing the configuration of the nozzle unit 39.

The nozzle portion 39 has an expansion portion 39a whose inner diameter increases from the upstream side to the downstream side in turn, and a tightening portion 39b whose inner diameter decreases by the downstream side, and the downstream end of the tightening portion 39b. The inner diameter of is comprised so that it may become equal to or slightly larger than the inner diameter of the said conveyance pipe 8. Accordingly, the silt powder 40 separated during conveyance of the mixture of the aggregate 1 and the cement milk 6, which becomes the material of the mortar M, becomes difficult to be mixed with the mixture again in the nozzle portion 39, The effect that the said silt powder 40 isolate | separated is fall-separated from the discharge port of the nozzle part 39 is acquired.

Next, the mortar concrete pouring method performed using the injection device D which consists of said structure is demonstrated.

The mortar concrete pouring method drives the aggregate feeder (2), the air compressor (3), and the pump for pumping (7), and moves the nozzle portion (39) of the conveying pipe (8) to an appropriate position. It can carry out by making it carry out.

That is, by driving the aggregate feeder 2 and the air compressor 3, the aggregate 1 is transported into the conveying pipe 8 together with the high pressure air, thereby leading to the cement milk introduction portion 9.

On the other hand, by driving the pump 7 for conveying, the cement milk 6 is transferred into the cement milk delivery pipe 10 to reach the cement milk inlet 9.

Then, the cement milk 6 and the aggregate 1 are mixed with each other toward the downstream side from the cement milk introduction portion 9, and finally, each grain of the aggregate 1 is surely cement milk 6 It is coated by, the aggregate (1) and the cement milk (6) is in a uniformly mixed state without non-uniformity.

As described above, the cement milk 6 and the aggregate 1 are mixed in an appropriate ratio, so that the mortar M (or concrete) is formed, and the formed mortar M (or concrete) is the cement milk introduction portion. It discharges to the pouring position of mortar (or concrete) from the said nozzle part 39 of the downstream of (9).

According to the injector D which consists of said structure, even if it carries long distance, it becomes possible to perform the spraying construction of mortar or concrete smoothly and reliably.

That is, in the said injection apparatus D, in the aggregate conveyer 2 for conveying the aggregate 1, the obturator 35 is arrange | positioned under the said communication port 14, and the opening of the communication port 14 is carried out. Since an area is comprised so that it may become about 1/4-flow path area (inner cross-sectional area) of the flow path area (internal cross-sectional area) or less in detail, and the flow path area (inner cross-sectional area) in the said conveyance pipe 8 is specifically, The aggregate 1 of the quantity less than the limit of the conveyance force of the quantity can flow quantitatively from the lower container 11b to the delivery part 15, and the mass exceeding the limit of the conveyance force of the said conveyance pipe 8 like conventionally Aggregate 1 flows into the conveying pipe 8 at a time, and it is possible to reliably prevent the blockage and pulsation from occurring in the conveying pipe 8.

In addition, the obstruction body 35 is disposed below the communication port 14 to block a part of the communication port 14, thereby forming a pooled portion where the aggregate 1 is collected above the obstruction body 35. Therefore, the introduction of the aggregate 1 into the communication port 14 in the lower container 11b does not become intermittent due to the rotation of the stirring blade 27, but the communication of the aggregate 1 by the stirring blade 27. Since the aggregate 1 collected in the pool portion continues to flow into the delivery section 15 while the introduction into the sphere 14 is not made, the continuity of conveyance of the aggregate 1 can be improved, and the conveyance pipe 8 It is very effective in preventing clogging in the shell and pulsation of the aggregate 1.

In addition, since the backflow prevention valve is provided in the pressurized pipe 25, when the compressed air starts to be transferred from the air compressor 3 to the upper container 11a in order to increase the pressure in the upper container 11a, the upper container The compressed air in the lower container 11b having a higher pressure than in the 11a can be prevented from flowing into the upper container 11a, thereby maintaining a large conveying force of the aggregate 1 and allowing stable continuous conveying. In addition, even with such a configuration, clogging and pulsation can be prevented from occurring in the conveying pipe 8, and non-uniformity can be prevented from occurring in the quality of the formed mortar or concrete.

Moreover, since the inner diameter of the downstream side part is larger than the internal diameter of the upstream side part than the said cement milk introduction part 9 of the said conveyance pipe 8 (connection hose part 8a), the following effects are acquired. Lose.

That is, in the conventional injection apparatus which made the inner diameter of the downstream part and the inner diameter of the upstream part the same as the said cement milk introduction part 9 of the said conveyance pipe 8, in the cement milk introduction part 9, the conveyance pipe 8 is carried out. Immediately after the cement milk 6 is introduced into the aggregate 1 as the conveyed product flowing through the inside), the conveyed product flowing in the conveying pipe 8 becomes a mixture of the aggregate 1 and the cement milk 6, and thus the conveyed product. The volume and weight of the cement milk introduction portion 9 in the conveying pipe 8 are reduced due to the influence of the stagnation of the conveyance of the conveyed product on the downstream side of the cement milk introduction portion 9 and the conveyance of the conveyed product. The conveyance speed of the conveyed object (aggregate 1) was also lowered on the upstream side of, and clogging could occur as the conveyance speed was lowered.

In addition, when the amount of the conveyed thing with respect to the conveyance pipe 8 increases by the introduction of the said cement milk 6 to an excessively large state, it is for flowing the aggregate 1 and the cement milk 6 downstream. The passage of the compressed air from the air compressor 3 disappeared, and the conveyance pipe 8 was obstructed by the conveyance (that is, aggregate 1 and cement milk 6).

However, in the injection apparatus D which has the above-mentioned structure, the compressed air from the said air compressor 3 is made larger by increasing the internal diameter of the downstream part rather than the cement milk introduction part 9 in the said conveyance pipe 8. Since the passage of can be ensured and also the fall of the conveyance speed of the conveyed material passing in the conveyance pipe 8 can be suppressed, the inside of the conveyance pipe 8 is blocked by the said aggregate 1 and the cement milk 6. Can be reliably prevented, and smooth spraying can be performed.

Further, a tapered portion 9a is formed in the cement milk introduction portion 9, the inner diameter of which is increased by the downstream side, and the aggregate 1 flows in the tapered portion 9a and the direction in which the cement milk 6 flows. Each downstream portion of the cement milk delivery pipe 10 is connected at an acute angle at this longitudinal section, and the cement milk 6 flowing into the conveying pipe 8 draws a spiral along the inner wall of the conveying pipe 8. Since the downstream portions of the cement milk delivery pipe 10 are connected at an angle with respect to the tapered portion 9a, the following effects can be obtained.

That is, without forming the tapered portion 9a whose inner diameter becomes larger in the cement milk introduction portion 9 in the conveying pipe 8 than the downstream side, the cement milk introduction portion has a cylindrical shape having the same diameter from the upstream side to the downstream side. In one conventional spraying device, since the aggregate conveyed in the conveying pipe with respect to the cement milk introduction part which is not tapered but cylindrical was easy to hit, the wear of the cement milk introduction part was severe and it was difficult to realize continuous conveyance for a long time.

Moreover, in the said conventional injection apparatus, the cement milk discharged in the cement milk introduction part becomes a curtain form, and the curtain of this cement milk becomes the resistance of the compressed air which flows in the conveyance pipe in order to convey aggregate, As a result, The conveyance force of the said compressed air may be reduced and the blockage may arise in a conveyance pipe.

Therefore, in order to prevent the cement milk introduced into the cement milk introduction portion from becoming a curtain, the cement milk delivery pipe is connected at an acute angle with respect to the cement milk introduction portion, and the angle formed by the introduction direction of the cement milk with respect to the conveying direction of the aggregate is set. By making it small, it is conceivable to introduce cement milk along the inner wall of the cement milk introduction portion. In this case, since the cement milk introduction portion is cylindrical rather than tapered, the cement milk delivery pipe formed in the cement milk introduction portion is formed. The area of the opening for introducing the cement milk becomes large, and the compressed air flowing in the conveying pipe from the opening easily enters, which may cause a problem in the introduction of the cement milk.

However, in the injector D having the above-described configuration, a tapered portion 9a is formed in which the inner diameter is increased by the downstream side, and the cement milk delivery pipe 10 is connected to the tapered portion 9a. Therefore, the aggregate 1 conveyed in the conveyance pipe 8 is hard to directly reach, the wear of the cement milk introduction part 9 is reduced, and long-term continuous conveyance can also be realized.

Moreover, in the injector D which has the above-mentioned structure, the taper-shaped part 9a which enlarges an inner diameter by the downstream side is formed, and the direction in which the aggregate 1 flows with respect to this tapered part 9a, and the cement milk 6 Is connected to each downstream portion of the cement milk delivery pipe 10 so that the flowing direction thereof is an acute angle at the longitudinal section, and further, the cement milk 6 flowing into the conveying pipe 8 forms an inner wall of the conveying pipe 8. Since each downstream portion of the cement milk delivery pipe 10 is connected at an angle with respect to the tapered portion 9a so as to draw a spiral along, the cement milk 6 connects the inner wall of the cement milk introduction portion 9. Since the resistance of the compressed air flowing in the conveying pipe 8 in order to convey the aggregate 1 does not become a curtain form and conveys the aggregate 1, the conveying force of the compressed air is reduced, In the return pipe It is prevented from causing occlusion in.

Further, the cement milk delivery pipe 10 is connected at an acute angle with respect to the cement milk introduction portion 9, and the angle formed by the introduction direction of the cement milk 6 with respect to the conveying direction of the aggregate 1 is made small. Since the part to which the cement milk delivery pipe 10 is connected is made into the tapered part 9a, the cement from the cement milk delivery pipe 10 formed in the said cement milk introduction part 9 (tapered part 9a) is made. The area of the opening for introducing the milk 6 can be made smaller than before, so that compressed air flowing into the conveying pipe 8 can be prevented from entering the opening 6, and the cement milk 6 is introduced. It becomes possible to perform smoothly.

In addition, the nozzle portion 39 is provided with an expansion portion 39a in which the inner diameter thereof becomes larger by the downstream side in order from an upstream side and a tightening portion 39b in which the inner diameter thereof becomes smaller by the downstream side thereof. Since the inner diameter of a downstream end is comprised so that it may become equal to or slightly larger than the inner diameter of the said conveyance pipe 8, the following effects are acquired.

That is, in the conventional injection apparatus in which the diameter of the end portion of the nozzle portion 39 is compressed smaller than the inner diameter of the conveying tube 8, the compression of the end portion of the nozzle portion 39 conveys the inside of the conveying tube 8. It became the resistance of the injection material (the aggregate 1 and the cement milk 6) which became, and the compressed air was reduced, and the aggregate 1 which is conveyed could be clogged in the conveyance pipe 8. In addition, the silt powder 40 which was hardly separated from the spraying material in the conveying pipe 8 immediately before the spraying was mixed with the spraying material again, making it difficult to construct using high quality mortar or concrete.

However, in the injection apparatus D which has the above-mentioned structure, since the diameter of the edge part of the said nozzle part 39 is about the same as the inner diameter of the conveyance pipe 8, or it compresses slightly larger, the conveyance inside the conveyance pipe 8 is conveyed. The injection material (the aggregate 1 and the cement milk 6) which has been used is not resisted, and the compressed air is not reduced, and the aggregate 1 being conveyed can be prevented from being clogged in the conveying pipe 8. In addition, since the flow velocity of the injection material does not increase unnecessarily, the silt powder separated from the injection material in the transfer pipe 8 immediately before injection, as shown in FIG. 8, while obtaining a certain amount of rectifying effect of the injection material. 40 can be discharged | emitted from the edge part of the nozzle part 39 in the state isolate | separated as it is, and it becomes possible to perform the construction using the high quality mortar or concrete.

By using the injection device (D) of the above configuration, it is possible to protect by using high quality mortar or concrete even in places where the conventional construction is very difficult or impossible due to the difficult installation of the machine, such as in the vicinity of the mountain peak, etc. It becomes possible.

For example, when the landscape protection by greening is performed on the inclined surface (ordinary surface) which may collapse, for example, a lattice-shaped inclined frame is formed by spraying mortar or concrete using the spraying device (D). In addition, the method of spraying a vegetation base material in the inclination frame can aim at the greening protection of an inclined surface. Hereinafter, specific examples of such a method will be described.

FIG. 9 is an explanatory diagram schematically showing a configuration of an example of the inclined spray frame method using the injector D. FIG.

According to the spray tilting frame method of the present embodiment, first, a reticular body 41, such as a lozenge or a turtle, is placed on the surface N to be the greening protection object as the first step (the reticular installation step), and further, an auxiliary anchor is used. (42) is inserted in the surface N at appropriate intervals, and this reticular body 41 is fixed to the surface N. On the other hand, the reticular body 41 is composed of an element wire having a diameter of about 0.8 to 1.6 mm, for example, and has a mesh size of about 2 to 6 cm.

Subsequently, as the second step (frame installation step), the plurality of wire rods 43 made of reinforcing bars (other may be, for example, wire ropes, etc.) on the network body 41 are at least in the longitudinal direction (contour line N) and the contour line. In the vertical direction) or in the transverse direction (direction parallel to the contour line of the normal surface N), and arranged in parallel with each other, preferably in a lattice shape, and inclined frame forming frame in the longitudinal direction of the wire member 43. 44 is provided and the wire 43 is lifted up and held in the frame 44.

Here, the inclined frame forming frame 44 can hold the wire rod 43, for example, the height is about 15 to 20 cm, the width is about 30 to 35 cm, the length is about 30 to 60 cm, welding By a combination structure of wires. Specifically, as shown in FIG. 10, the frame member 45 which forms a pair of semi-circle shape, the two connection member 46 which integrates a pair of frame member 45, and two connection member ( The wire holding member 47 is sandwiched between 46.

Therefore, after installing the frame 44 so that the wire rod 43 can be seated, the wire rod 43 is lifted to the wire rod holding member 47 and bound to the wire rod holding member 47 by the line b or the like. The wire 43 is kept at a position of a predetermined height on the surface N.

Next, as a 3rd process, the curing sheet 48 is arrange | positioned on the network 41 of this site | part so that the site | part enclosed by the wire rod 43 arrange | positioned in a grid | lattice form as a vegetation area. Then, using the injector D as the fourth step (injection step), the mortar M or the concrete is used as the reference for the injection width and the injection height of the inclined frame forming frame 44, and further, a lattice type The wire rod 43 and the inclined frame forming frame 44 are sprayed to fill the lattice-shaped inclined frame 49 due to the mortar M or the elevation of the concrete on the surface N. As shown in FIG.

Finally, the curing sheet 48 is removed after the predetermined curing of the mortar M or concrete as a fifth step, and the vegetation substrate 50 is buried in the vegetation region described above.

In the inclined spray frame method having the above-described structure, the mortar (M) or concrete is sprayed onto the surface (N), which is very difficult or impossible to spray mortar or concrete in a conventional spraying device such as in the vicinity of a mountain peak in a rough mountainous region. To form the inclined frame 49, and the inclined frame 49 can prevent the collapse thereof, and after the inclined frame 49 is formed, the landscape is preserved by the plant and the natural state of the normal surface N. Restoration can be achieved early.

For example, if there is a rock that may collapse in the upper part of the steep slope, and if the removal itself is rather dangerous, mortar (M) or the like may be used by using the injection device (D) to prevent the rock from crashing. It is possible to employ a method of planning the joining of the rock by conveying and filling the crack in the rock. Hereinafter, specific examples of such a method will be described.

11 (A) to (C) are explanatory diagrams schematically showing a configuration of an example of a rock bonding method using the injector D. FIG.

In the rock bonding method of the present embodiment, when there is a risk of collapse of the entire rock G as a first step, the mortar M and the like are stabilized by using the injector D in the base portion thereof.

Subsequently, as shown in Fig. 11A, as a second step (cleaning step), air or water is sprayed at high pressure to clean the adhesive surface (the surface to be bonded by mortar (M) or the like). . Thereby, the soil, moss, etc. which exist in an adhesive surface are removed.

Next, as shown in Fig. 11B, the filler 52 is appropriately filled in the vicinity of, for example, the openings of the rock G and the crack 51 of the rock. This step is performed in order to form an embankment which prevents the mortar (M) etc. of the next process (fourth process) from flowing out from the crack part 51, and the interfilling material 52 is a mortar (M). As long as the adhesion to the back and the like is good, what may be used. Filling with mortar (M) or the like, which is the same material, is preferable in view of economical efficiency and adhesion. On the other hand, if there is no fear of leakage of mortar M or the like from the cracks 51 in the next step (fourth step), this third step can be omitted.

Finally, as shown in FIG.11 (C), as a 4th process (injection process), mortar M or concrete is poured into the said crack part 52 using the said injection device D. As shown in FIG. Since mortar (M) or concrete used in this process needs to be filled to the crack detail, the mixing is appropriately adjusted to increase fluidity.

In the rock bonding method having the above-described structure, the mortar or concrete cannot be conveyed by a conventional spraying device such as near a mountain peak in a steep mountainous part, or it is present on the surface N where it is necessary to install the spraying device on an unstable mountainside. In addition, it is possible to transport mortar (M) or concrete over a long distance to the huge rock, rock (G) and rock that may have a rockfall, and the huge rock, rock (G) and rock mass. The entire crack surface 52 can be stabilized by adhesive filling with the mortar M or concrete.

Moreover, the injection apparatus D which concerns on this invention is applicable also to the earth retaining wall construction method disclosed by the retaining wall construction in a mountain part, for example, Unexamined-Japanese-Patent No. 6-294139. In the case of the retaining wall method, the retaining wall is constructed by pouring mortar (M) or concrete between the cut or fill slopes and the forming plate (form) of the retaining wall surface, which is set up at a distance from the inclined surface.

In this case, even if the injection device D is not lifted up to the vicinity of the retaining wall construction, the mortar M or the concrete material can be transported for a long distance, and a high quality retaining wall can be constructed.

Moreover, the injection apparatus D which concerns on this invention is applicable also to the construction method of the construction of a dam or a dam for the purpose of four directions, etc. in a mountainous part, for example, Unexamined-Japanese-Patent No. 10-266168. In the case of construction of dams or dams, the foundations are formed by placing mortar (M) or concrete between molding plates (forms: soil containers in the above-mentioned publications) installed on the surface and back of the foundations. Build.

In this case, it is possible to carry out casting by carrying a long distance conveyance of mortar (M) or concrete material, and to build a high quality weeping body, without lifting and carrying the injection apparatus D to the vicinity of a water body construction vicinity.

It is explanatory drawing which showed schematically the structure of an example of the tunnel formation construction which uses the said injection apparatus D. FIG.

The injection device according to the present invention also exhibits its superiority even in such tunnel formation work. Specifically, the main process of tunnel construction

(1) Process of excavating Jisan 53 and carrying excavated earth and sand out of a tunnel (hereinafter referred to as process 1)

(2) Process of spraying concrete 54 to Jisan excavation surface 55 (henceforth a process 2)

(3) Process of pouring the locking bolt 56 to the jisan 53 so that it may become a radiation form when it sees from a tunnel cross section (henceforth a process 3).

(4) A step of performing waterproof treatment, such as attaching a waterproof sheet (not shown) to the concrete surface 54 formed in Step 2 (hereinafter, referred to as Step 4).

(5) Process of embedding concrete 57 using tunnel form (centle) (hereinafter referred to as process 5)

Can be divided into

In addition, the process 1 is called an excavation hole, the steps 2 and 3 are called Jibo-Gong (the process of holding up the excavated Jisan to prevent collapse), and the steps 4 and 5 are called the perforations (the process of covering and reinforcing the Jibo-Gong). These processes are repeated in sequence to form a tunnel.

Here, the concrete (54, 57) is used in the process 2 and 5, conventionally, because the concrete was sprayed after transporting to the construction site in the mixer car, it is not yet completely independent, the mixer car in a narrow tunnel Operation is difficult and dangerous, and the construction time is reduced by taking time to transport. However, by using the injector (D) of the present invention that can transport the concrete over a long distance, the plant can be installed outside a tunnel with a safe and large working space, and at the same time, the rubber hose, which is easy to handle, can be extended from the plant to the construction site. Just by being able to spray like a conventional one, and being able to spray concrete of high quality, it can contribute to the improvement of safety and workability of tunnel formation construction.

Aggregate can be quantitatively flowed from the container to the delivery section by quantity that falls below the limit of the conveyance force of the conveying pipe, and it prevents the occurrence of blockage or pulsation in the conveying pipe smoothly and surely even for long distance conveying. It is possible to carry out and to carry and spray the mortar or concrete even in places where the machine is restricted, such as near the mountain top of the hilly mountain.

According to this invention which consists of said structure, even if it is long-distance conveyance, it becomes possible to provide the mortar or concrete spraying apparatus which enables to carry out the spraying construction of mortar or concrete smoothly and reliably.

That is, in the invention according to claim 1, since the opening area of the communication port is configured to be equal to or less than the flow path area in the conveying pipe, an aggregate amount positively below the limit of the conveying force of the conveying pipe can be quantitatively flowed from the container to the dispensing part. Similarly, it is possible to reliably prevent a large amount of aggregate from exceeding the limit of the conveyance force of the conveyance pipe into the conveying pipe at once, causing blockage and pulsation in the conveying pipe.

In the invention according to claim 2, since the obturator that blocks a portion of the communication port is disposed below the bottom wall of the container, adjustment of the opening area of the communication port is facilitated, and a pool portion where aggregate is collected above the obstruction is formed. Since the aggregate gathered in this pool part continues to flow to a delivery part, the continuity of conveyance of aggregate can be improved, and the very preferable effect is acquired at the point of preventing the blockage of a conveyance pipe, and pulsation of an aggregate.

In the invention according to claim 3, since the backflow prevention valve is provided in the middle of the compressed air flow passage connected to the lower container, when the compressed air is transferred from the compressed air supply means to the upper container in order to increase the pressure in the upper container, The compressed air in the lower container having a higher pressure than in the upper container can be prevented from flowing to the upper container, whereby the conveying force of the aggregate is largely maintained and stable continuous conveying can be carried out, and also conveyed by such a configuration. Blockage or pulsation can be prevented from occurring in the tube, and non-uniformity can be prevented from occurring in the quality of the formed mortar or concrete.

In the invention according to claim 4, the following effects are obtained. That is, in the conventional injection apparatus which made the inner diameter of the part of a downstream side the same as the inner diameter of the part of an upstream rather than a conveyance pipe cement milk introduction part, immediately after introducing cement milk to the aggregate as a conveyed material which flows in a conveyance pipe in a cement milk introduction part. Since the conveyed thing which flows in a conveyance pipe becomes a mixture of aggregate and a cement milk, and the volume and weight of a conveyed object increase by this, the conveyance speed of the conveyed material downstream of the said cement milk introduction part falls, and the conveyance of this conveyed product Due to the influence of the stagnation, the conveyance speed of the conveyed matter (aggregate) also decreased on the upstream side of the cement milk introduction portion in the conveyance pipe, and a blockage could occur due to the decrease of the conveyance speed.

In addition, when the amount of conveyed material to a conveying pipe increases by the introduction of cement milk to an excessively large state, the compressed air from the compressed air supply means (for example, air compressor) for flowing the aggregate and cement milk downstream. The passage of was lost, and the conveyance pipe inside was blocked by the said conveyance (namely, aggregate and cement milk).

However, in the invention according to claim 4, the passage of compressed air from the compressed air supply means can be secured by increasing the inner diameter of the downstream side of the cement milk introduction portion in the conveying pipe. Since the fall of the conveyance speed of the conveyed material can also be suppressed, it is possible to reliably prevent the inside of the conveying pipe from being blocked by aggregate and cement milk, and it is possible to perform smooth spraying.

In the invention according to claim 5, the following effects are obtained. That is, in the conventional injection apparatus in which the cement milk introduction portion is formed in a cylindrical shape having the same diameter from the upstream side to the downstream side without forming a tapered portion whose internal diameter becomes larger by the downstream side in the cement milk introduction portion in the conveying pipe, However, since the aggregate conveyed in the conveyance pipe was easy to collide with the cylindrical cement milk introduction portion, the cement milk introduction portion was badly worn, and it was difficult to realize continuous conveyance for a long time.

In the conventional spraying apparatus, the cement milk discharged from the cement milk introduction part becomes a curtain shape, and the curtain of the cement milk becomes a resistance of the compressed air flowing in the conveying pipe to convey the aggregate, and as a result, the crimping The conveyance force of air was reduced and the blockage could arise in a conveyance pipe.

Therefore, in order to prevent the cement milk introduced into the cement milk introduction portion from becoming a curtain, the cement milk delivery pipe is connected at an acute angle with respect to the cement milk introduction portion, and the angle made by the introduction direction of the cement milk with respect to the conveying direction of the aggregate is made small. In this case, it is conceivable to introduce the cement milk along the inner wall of the cement milk introduction section. In this case, since the cement milk introduction section is cylindrical rather than tapered, the cement milk from the cement milk delivery pipe formed in the cement milk introduction section is introduced. The area of the opening for introducing the gas was increased, and the compressed air flowing in the conveying pipe easily entered from this opening, and there was a risk of causing a problem in the introduction of the cement milk.

However, in the invention according to claim 5, since a tapered portion having an inner diameter larger than the downstream side is formed and a cement milk delivery pipe is connected to the tapered portion, the aggregate conveyed in the conveying pipe does not hit directly. Abrasion of the cement milk introduction portion is reduced, and a long continuous conveyance can be realized.

In addition, in the invention according to claim 5, the cement milk delivery pipe is connected at an acute angle with respect to the cement milk introduction part, and the cement milk delivery pipe is connected while reducing the angle formed by the introduction direction of the cement milk with respect to the conveying direction of the aggregate. Since the part to be used was a tapered part, the area of the opening for introducing the cement milk from the cement milk delivery pipe formed in the tapered part can be made smaller than before. It is possible to prevent air from entering and to smoothly introduce the cement milk.

Further, in the invention according to claim 6, the following effects are obtained. That is, in the conventional injection apparatus in which the diameter of the end of the nozzle portion is compressed smaller than the inner diameter of the conveying tube, the compression of the end of the nozzle portion becomes the resistance of the injection material (aggregate and cement milk) that has been conveyed in the conveying tube, The air was reduced and the aggregate being transported could be blocked in the conveying pipe. In addition, the silt powder, which was hardly separated from the spraying material in the conveying pipe immediately before the spraying, was mixed with the spraying material again, and it was difficult to construct using high quality mortar or concrete.

However, in the invention according to claim 6, since the diameter of the end portion of the nozzle portion is compressed to be about the same as or slightly larger than the inner diameter of the conveying tube, it is not a resistance of the injection material conveyed in the conveying tube and the compressed air is not reduced. The aggregate being conveyed can be prevented from being blocked in the conveying pipe. In addition, since the flow rate of the spraying material does not increase unnecessarily, the silt powder separated from the spraying material in the conveying pipe immediately before the spraying is separated from the end of the nozzle unit while obtaining a certain amount of rectifying effect of the spraying material. It can be discharged, and construction with high quality mortar or concrete can be performed.

According to the spraying method of mortar or concrete according to claim 7, since it is possible to quantitatively flow an amount of aggregate below the limit of the conveying force of the conveying pipe, it is possible to spray the mortar or concrete without causing blockage or pulsation in the conveying pipe. It is possible to perform construction using high quality mortar or concrete.

Claims (7)

As a mortar or concrete spraying device for separately conveying the aggregate and cement milk constituting the mortar or concrete, and then mixed and sprayed, Aggregate presser for pressurizing the aggregate, And a conveying pipe connected to this aggregate feeder, The aggregate feeder is provided with a container for accommodating aggregate, and a discharge part connected to the inside of the container via a communication port at a lower side of the container, and to which the conveying pipe is connected. Aggregate dropped from the container to the delivery section through a communication port provided on the bottom wall of the container is to be sent to the conveying pipe, A mortar or concrete spraying device, characterized in that the opening area of the communication port is set to be equal to or less than the flow path area in the conveying pipe. The mortar or concrete spraying device according to claim 1, wherein an obturator is disposed below the bottom wall of the container so as to close a part of the communication port. As a mortar or concrete spraying device for separately conveying the aggregate and cement milk constituting the mortar or concrete, and then mixed and sprayed, Aggregate presser for pressurizing the aggregate, And a conveying pipe connected to this aggregate feeder, A first opening and closing means in which the aggregate feeder is opened and closed with the upper container and the lower container, and is switched to a state in which the inside of the upper container communicates with the outside and is isolated from the outside, and a second opening and closing between the upper container and the lower container. It is installed to communicate with the inside of the lower container through the opening and closing means, the lower side of the lower container through the communication port, to supply the compressed air to the delivery unit to which the conveying pipe is connected, the upper container, the lower container and the delivery unit Compressed air supply means for After the aggregate is stirred in the upper container, the compressed air is introduced into the upper container while the first and second opening and closing means are closed to apply pressure to open the second opening and closing means so that the aggregate in the upper container is opened in the lower container. After dropping, the aggregate dropped into the delivery pipe from the communication port provided below this lower container is discharged into the conveying pipe, and is conveyed to the downstream side by the compressed air from the compressed air supply means. Or a mortar provided with a non-return valve in the middle of the compressed air flow passage connected to the lower container so as to suppress a change in the pressure of the compressed air transferred from the compressed air supply means to the lower container through the compressed air flow passage. Concrete spraying device. As a mortar or concrete spraying device for separately conveying the aggregate and cement milk constituting the mortar or concrete, and then mixed and sprayed, A cement milk delivery pipe for conveying the cement milk, And a conveying pipe for conveying the aggregate, The said conveying pipe has a cement milk introduction part to which the downstream end of the said cement milk delivery pipe is connected, and it is comprised so that the inner diameter of the downstream part may become larger than the inner diameter of the upstream part than this cement milk introduction part. Mortar or concrete injector. As a mortar or concrete spraying device for separately conveying the aggregate and cement milk constituting the mortar or concrete, and then mixed and sprayed, A cement milk delivery pipe for conveying the cement milk, And a conveying pipe for conveying the aggregate, The said conveying pipe has a cement milk introduction part to which the downstream end of the said cement milk delivery pipe is connected, The tapered part which has an internal diameter larger as much as a downstream side is formed in this cement milk introduction part, and aggregates with respect to the said tapered part. A mortar or concrete spraying device, characterized in that the cement milk delivery pipe is connected so that the direction in which the gas flows and the direction of the cement milk flows at an acute angle at the longitudinal section. As a mortar or concrete spraying device for separately conveying the aggregate and cement milk constituting the mortar or concrete, and then mixed and sprayed, The nozzle part is provided in the downstream end of the conveyance pipe which conveys the mixed aggregate and cement milk, and this nozzle part becomes the expansion part whose internal diameter grows by the downstream from the upstream, and the tightening part which becomes small by the downstream side. And the inner diameter of the downstream end of the tightening part is configured to be equal to or slightly larger than the inner diameter of the conveying pipe. A mortar or concrete spraying method comprising spraying mortar or concrete using the spraying device according to any one of claims 1 to 6.

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