KR100746376B1 - powder material conveying apparatus for shotcrete - Google Patents

Abstract

According to the present invention, the powder conveying apparatus of the shock concrete is a hopper for storing the powder for transporting and the outlet formed in the lower portion; A pressurizing tank connected to the outlet to discharge the powder discharged to the outlet using pneumatic pressure to discharge the powder discharged to the outlet using pneumatic pressure and a pressurized tank to store the powder discharged from the outlet to the outlet; A powder feeding part having a pneumatic injection nozzle connected to the high pressure supply pipe and a pressure feeding pipe installed in a pressure feeding tank on a side corresponding to the pneumatic injection nozzle and discharging the powder that is piggybacked in the high pressure air supplied from the pneumatic injection nozzle ; And a valve unit installed at the discharge port to control powder supply to the pressure feeding tank.

Shockcrete, Body, Transfer

Description

Powder conveying apparatus for shockcrete {powder material conveying apparatus for shotcrete}

1 is a view showing a powder conveying apparatus according to the present invention,

2 is a partial ablation perspective view showing a first hopper or a second hopper,

3 is a cross-sectional view showing a powder conveying portion,

Figure 4 is a partial ablation perspective view showing a first hopper or a second hopper.

The present invention relates to a powder conveying apparatus, and more particularly, to a powder conveying apparatus for shotcrete for conveying a curing accelerator using high pressure air.

In general, concrete structures used in civil engineering and construction are cast concrete using wood or steel mold to obtain the desired shape. However, the concrete used for the special purpose is to cast cement, sand and gravel on the wall or ceiling using compressed air without installing the mold.

In particular, with the introduction of the New Austrain Tunneling Method (NATM) in tunnels for underground laying of underground subways, railways, roads, power lines, and communication cables, the Shockcrete method has been adopted to stabilize the ground rock movement after rock excavation. Used. This method is a method to add safety to the excavation section by initially minimizing the relaxation pressure moving from the inside because the interlocking effect of discontinuous rocks disappears early after the underground rock excavation in the NATM method without conventional support. As the concrete is sprayed at a spray pressure of about 70-80 m / sec, the concrete is penetrated into the cracks of the cracks to bond the cracks, and the ground surface is covered to maintain the excavation section safely. In addition, the gas pressure generated by the blasting effect is to prevent the leakage caused by the water is pressed into the surrounding rock and back to the surface.

The shockcrete attached to the excavated rock requires characteristics such as low water / cement ratio and high initial strength. In particular, in order to obtain an initial strength of 55kg / cm2 or more within 8 hours, a curing accelerator is essentially used.

The components of the hardening accelerator for shockcrete currently used are mainly mixed with alkaline salts such as NaAlO 2, Na 2 SiO 3, Na 2 CO 3, Ca (OH) 2, and K 2 CO 3. , Na2CO3, K2CO3 and the like are mixed with water content of about 30-50wt%. The liquid curing accelerator used is added before being sprayed from the spray nozzle.

Among the hardening accelerators, the powdery hardening accelerator is mixed with the concrete and sprayed, and the powdery hardening accelerator is sprayed onto the high-pressure air by the principle of the Bantry tube. However, the injection of the curing accelerator has a problem that the stable and continuous injection is not made.

No. 0360087, a registered utility model, discloses a mortar concrete pump car shock injection nozzle.

The present invention has been made in view of the above-mentioned problems, and an object thereof is to provide a powder transfer apparatus for shockcrete capable of smoothly transporting a powder for hardening accelerator for shockcrete mixed with cement.

Another object of the present invention is to provide a powder conveying apparatus for shockcrete capable of continuously conveying the main body, reducing the trouble caused by the supply of powder, and increasing the conveying efficiency of air according to the conveying of the powder.

Powder conveying apparatus of the present invention for achieving the above object is

A hopper in which powder for transport is stored and an outlet is formed at the bottom thereof;

A pressurized tank connected to the outlet to pressurize the powder discharged to the outlet using pneumatic pressure, a pressurized tank connected to the outlet to store the powder discharged from the outlet, a pneumatic spray nozzle installed at the pressurized tank and connected to a high pressure supply pipe; A powder pressure feeding part provided in a pressure feeding tank on a side corresponding to the pneumatic injection nozzle and having a pressure feeding pipe for discharging the powder piggybacked in the high pressure air supplied from the pneumatic injection nozzle;

And a valve unit installed at the discharge port to control powder supply to the pressure feeding tank.

In the present invention, the hopper is further provided with a screw feeder is installed so that the powder is adjacent to the discharge port to smoothly discharge the powder. And the valve unit is installed in the lower portion of the pressure tank and the actuator having a rod penetrating the pressure tank, and the valve member is installed at the end of the rod in contact with and separated from the valve seat installed in the outlet port to open and close the outlet port It is provided.

Alternatively, in order to achieve the above object, the powder delivery apparatus for shockcrete of the present invention includes hoppers in which powder for transporting is formed and an outlet is formed at the bottom thereof;

It is connected to the outlet of each hopper to pressurize the powder discharged to the outlet using pneumatic, connected to the outlet port for storing the powder discharged from the outlet and the pneumatic injection pipe is installed in the pressure tank and connected to the high pressure supply pipe Powder conveying parts having a nozzle and a feeding pipe which is installed in a pressure feeding tank on a side corresponding to the pneumatic injection nozzle, and discharges powder that is piggybacked in the high pressure air supplied from the pneumatic injection nozzle;

A valve unit installed at an outlet of each hopper to control powder supply to the pressure feeding tank;

A dehumidifier installed in the high pressure supply pipe to remove moisture from the air supplied to the high pressure supply pipe;

A main discharge pipe connected to the pressure feed pipes connected to the pressure feed tanks of the powder feeding parts;

A control unit for continuously discharging the powder supplied from the respective hopper rotor to the pressure feeding tank of the powder feeding part through the main discharge pipe by manipulating the valve unit of each powder feeding part and the high pressure supply pipe connected to the pressure feeding tank; It is characterized by what was provided.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

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Figure 1 shows an embodiment of the powder transport apparatus for shockcrete according to the present invention.

Referring to the drawings, the powder conveying apparatus for the shock concrete is spraying the powder, that is, the hardening accelerator for the shock concrete, the powder for transport is stored and the first, second outlets (23, 24) formed in the lower portion, Two hoppers 21 and 22; First and second powder conveying unit 30 for conveying the powder discharged by being installed in the first and second outlets 23 and 24 of the first and second hoppers 21 and 22, respectively, by using pneumatic pressure. 40; It is installed in the first and second outlets 23 and 24 of the first and second hoppers 21 and 22 to supply powder to the pressure feeding tanks 31 and 41 of the powder feeding parts 30 and 40, respectively. First and second valve units (50) and (60) to control the; Pneumatic supply means 70 for supplying air pressure to the pneumatic cylinders 51 and 61 which are actuators of the first and second powder conveying units 30 and 40 and the first and second valve units 50 and 60. ).

When described in more detail for each component of the powder transport apparatus for shock concrete 10 configured as described above are as follows.

The first hopper 21 has a structure in which the lower side is gradually narrowed toward the first outlet 23 so that the powder discharge can be made smoothly through the first outlet 23. Although not shown in the drawing, the upper side is sealed and an injection hole for supplying powder therein may be formed. The second hopper 22 has the same structure as the first hopper 21. The hopper is not limited to the above-described embodiment, and any hopper can be used as long as it can store powder. For example, it may be made of a tank.

The first and second powder conveying units 30 and 40 are respectively installed at the first and second outlets 23 and 24 of the first and second hoppers 21 and 22, respectively, and the first and second outlets 23 are respectively provided. One embodiment is shown in FIGS. 1 and 2 by discharging each of the powders supplied from the twenty-four) to air and discharging them through the first and second pressure pipes and the discharge pipe.

Referring to the drawings, the first and second powder conveying portions 30 and 40 have substantially the same structure. The first and second powder conveying parts 30 and 40 are installed at the first and second discharge ports 23 and 24 of the first and second hoppers 21 and 22, respectively, and the internal space part 31a. Pneumatic injection nozzles (31) and (41) having a (41a) and pneumatic injection nozzles (32) installed on one side of the pressure feeding tanks (31) (41) for supplying air to the inner space portions (31a) (41a); 32 and 42 and the other side of the pressure feeding tanks 31 and 41, that is, the pneumatic injection nozzles 32 and 42, are installed to communicate with the powders of the inner spaces 31a and 41a. Discharge pipes 33 and 43 discharged by piggybacking are provided. Preferably, the pressure feeding tanks 31 and 41 are formed of tubular tanks of which the lower part is blocked, and the pneumatic injection nozzles 32 and 42 and the discharge pipes 33 and 43 are pressure feeding tanks 31 and 41. It is preferable to install on the lower side of the. The pneumatic injection nozzles 32 and 42 are inclined from the inner wall surfaces of the pressure feeding tanks 31 and 42 to the end sides of the pneumatic injection nozzles 32 and 42 to inject the powder into the pneumatic injection nozzles 32 and 42. Guide portions 35 and 45 guide to the end side of the may be further provided.

Meanwhile, a powder supply nozzle or screw feeder may be installed in the pressure feeding tanks 31 and 41 to uniformly discharge the powder discharged to the discharge pipes 33 and 43 by the pneumatic pressure. have.

The first and second valve units 50 and 60 are installed at the first and second outlets 23 and 24 of the first and second hoppers 21 and 22, respectively, and the pressure feeding tanks 31 and 41 are respectively provided. One embodiment is shown in FIG. 1 by interrupting the supply of powder to the inner space portions 31a and 41a of.

Referring to the drawings, the first and second valve units 50 and 60 may include an actuator installed in each of the first and second hoppers 21 and 22, that is, the pneumatic cylinders 51 and 61. The valve members 54 and 64 are installed on the rods 52 and 62 of the pneumatic cylinders 51 and 61 and are in contact with and separated from the valve seats 53 and 63 provided on the outlet side.

As shown in FIG. 4, another embodiment of the valve unit is an actuator having rods 55 and 65 installed below the pressure tanks 31 and 41 and penetrating the pressure tanks 31 and 41. Pneumatic cylinders (56) and 66, and the end of the rods (55) (66) are contacted and separated from the valve seats (53, 63) installed in the outlet (23), 24 to open and close the outlet Valve members 57 and 67 are provided.

The first and second valve units are not limited to the above-described embodiments and may be any structure as long as the first and second valve units can open and close the first and second outlets of the first and second hoppers.

The pneumatic supply means 70 may supply pneumatic pressure to the pneumatic injection nozzles 32 and 42 and the pneumatic cylinders of the first and second valve units, and a compressor (not shown) and a manifold connected to the compressor. The first and second pneumatic supply pipes (72) and (73) connected to the folder (71) and the manifold (71) and connected to the respective pneumatic injection nozzles (32) and (43), and the manifold (51). And first and second connection pipes 74 and 75 connected to the pneumatic cylinders of the first and second valve units 50 and 60. On the side adjacent to the manifold 71 is provided a dehumidifier (80) for removing the moisture of the air supplied to the first and second pneumatic supply pipe (72) (73), the dehumidifier (80) cools the air It has a structure that can be removed by cooling the water to dew point temperature below the dew point temperature.

On the other hand, the discharge pipes 33 and 43 of each of the first and second powder conveying parts 30 and 40 are connected to the main discharge pipe 103 by the first and second pressure feeding pipes 101 and 102. The first and second pneumatic supply pipes 72 and 73 and the first and second connection pipes 74 and 75 may include first, second, third and fourth valves 111 and 112 for controlling the flow of air. The first and second check valves 115 and 116 are installed at the first and second pressure pipes 101 and 102 to prevent backflow of the discharged air. It is preferable to use solenoid valves for the first, second, third and third valves.

And controlling means 90 for controlling the air supply to the valve unit and the first and second pneumatic supply pipes by controlling the first, second, third and fourth valves so that the powder is continuously discharged through the main discharge pipe 103. This may be further provided. The control means 90 may be made of a microcomputer capable of operating the first, second, third and fourth valves according to the operation sequence.

On the other hand, on the side adjacent to the first and second outlets 23 and 24 of the first and second hoppers 21 and 22, the powder in the first and second hoppers 21 and 22 is discharged to the first and second outlets. A screw feeder 120 may be further provided to smoothly discharge to the 23 and 24 sides (see FIG. 4). The screw peter 120 may be installed perpendicular to the hopper or horizontally installed in the first and second outlets 23 and 24. Screw feeder 120 has a conventional structure, the screw feeder is rotated by a motor, it may be made by installing a spiral blade on the rotating shaft.

The powder transfer apparatus 10 for shock concrete configured as described above is installed in a mortar concrete pump car and sprays powder at a high pressure so that the concrete and the main body, that is, the curing accelerator are mixed and sprayed, first, by the control means. By retracting the valve member 54 by operating the first pneumatic cylinder 51 of the first valve unit 50 provided at the outlet 23 of the hopper 21, the powder in the first hopper 21 is transferred to the pressure transfer tank ( 31 is filled in the internal space 31a. Then, the valve member 54 blocks the first outlet 23 by operating the first valve unit 50, and the control means 90 opens the first valve 111 of the first high pressure supply pipe 72. By operating the high pressure air to the pneumatic injection nozzle (32). When the high-pressure air is injected through the pneumatic injection nozzle 32 as described above, the air discharges the main discharge pipe 103 through the discharge pipe 32 and the pressure feed pipe 101 while piggybacking the powder in the pressure feed tank 31. To be discharged. At this time, since the check valve 116 is installed in the second pressure pipe 102, the high-pressure air, which has been powdered through the second pressure pipe 103, is prevented from flowing back.

As described above, the fourth valve 114 is operated in the process of conveying the powder in the pressure feed tank communicating with the first discharge port 23 of the first hopper 21 to operate the second discharge port of the second hopper 22 ( 24 is opened, and the powder in the second hopper 22 is supplied to the internal space portion 41a of the pressure feeding tank 41. The first valve 111 is blocked and the second valve 112 of the second high pressure supply pipe 73 is opened at the time point at which the powder in the pressure feeding tank 31 connected to the first hopper 21 is supplied. As described above, the powder is conveyed to the main discharge pipe 103.

As described above, the screw feeder 120 installed inside the first and second hoppers 21 and 22 is rotated in the process of conveying the powder so that the powder can be discharged to the outlet when the first and second valve units are operated. It is preferable to. Here, the screw feeder is preferably such that it can be operated only during the operation of the first and second valve units. And the powder transfer completion point of the powder conveying unit connected to the outlet side of the first and second hoppers 21, 22 is completed in the state that the initial set time is calculated in consideration of the supply pressure of the air and the pressure tank is completed separately It is not necessary to install a sensor to measure whether or not it is.

As described above, the powder delivery apparatus for shockcrete according to the present invention is sprayed with high viscosity and dense pours, such as shotcrete concrete mortar, so that the powder can be stably transported during deposition. There is an effect to increase the deposition rate, it is possible to increase the operation rate of the device.

Although the present invention has been described with reference to one embodiment shown in the drawings, this is merely exemplary, and it will be understood by those skilled in the art that various modifications and equivalent embodiments are possible.

Therefore, the true scope of protection of the present invention should be defined only by the appended claims.

Claims (6)

A hopper (21) (22) having a discharge port formed therein and storing powder for transportation; It is connected to the outlets 23 and 24 to pressurize the powder discharged to the outlet using pneumatic pressure tanks 31 and 41 connected to the outlets 23 and 24 to store the powder discharged from the outlet. And pneumatic injection nozzles 32 and 42 installed in the pressure feeding tanks 31 and 41 and connected to the high pressure supply pipe, and installed in a pressure feeding tank on a side corresponding to the pneumatic injection nozzles. A powder conveying part (30) (40) having a discharge pipe for discharging the powder piggybacked on the high-pressure air supplied from (42); And a valve unit (50) (60) installed at the discharge port to intercept the powder supply from the hopper (51) (61) to the pressure feed tank. Claim 2 was abandoned when the setup registration fee was paid. The method of claim 1, The hopper (21) (22) is a powder delivery device for shock concrete, characterized in that the powder is installed adjacent to the discharge port is further provided with a screw feeder (120) to smoothly discharge the powder. Claim 3 was abandoned when the setup registration fee was paid. The method of claim 1, The valve units (50) and (60) are provided with an actuator (51) (61) having a rod passing through the pressure feeding tank and installed at the lower portion of the pressure feeding tank, and a valve seat (53) installed at the end of the rod and installed at the discharge port. Shock conveying powder conveying device, characterized in that it comprises a valve member (54) (64) for contacting and separating the (63) to open and close the outlet. Hoppers 21 and 22 in which powder for transporting is stored and an outlet is formed at the bottom thereof; The pressure feed tank 31 is connected to the outlets 23 and 24 of the respective hoppers 21 and 22 to pressurize the powder discharged to the discharge port using pneumatic pressure to store the powder discharged from the discharge port. (41), the pneumatic injection nozzles 32 and 43 installed in the pressure feeding tank and connected to the high pressure supply pipe, and the pneumatic injection nozzles on the side corresponding to the pneumatic injection nozzles 32 and 42 are installed from the pneumatic injection nozzles. Powder conveying parts 30 and 40 having discharge pipes for discharging the powdered material to be supplied with high pressure air; Valve units (50) (60) installed at outlets of the respective hoppers (21) and (22) to control powder supply to the pressure feeding tank; A dehumidifier (80) installed in the high pressure supply pipe to remove moisture from the air supplied to the high pressure supply pipe; A main discharge pipe 103 connected to discharge pipes connected to the pressure feeding tanks of the powder transfer parts 30 and 40; By operating the valve unit of each powder conveying unit and the valves installed in the high pressure supply pipe connected to the pressure feeding tank to continuously discharge the powder supplied from the respective hoppers 21, 22 to the pressure feeding tank of the powder conveying unit through the main discharge pipe. Control means (90); The powder conveying device for shock concrete characterized in that it comprises a. Claim 5 was abandoned upon payment of a set-up fee. The method of claim 4, wherein The valve unit is installed in the lower portion of the pressure tank (31) (41) and the actuators 56 and 66 having rods (55) (65) passing through the pressure tank, and is installed at the end of the rod and the outlet And a valve member (57) (67) for contacting and separating from the valve seat installed in the valve seat to open and close the discharge port. delete

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