JP4494923B2 - Quick setting agent supply device - Google Patents

Description

  The present invention relates to a quick setting agent supply apparatus.

  When spraying mortar or concrete for the purpose of preventing collapse of natural ground in tunnel excavation or the like, such as the NATM method, a powder rapid setting agent is added to the mortar or concrete. The addition amount of the quick setting agent is preferably selected from the field conditions such as the amount of rebound of sprayed mortar or concrete, and the quick setting agent is usually the quick setting agent connected to the spraying mortar or concrete supply equipment. It is supplied by a supply device.

Conventionally, the quick setting agent is stored in the quick setting agent storage tank, and is supplied from the tank to the quick setting agent addition tank through the transport pipe by pressurized air (compressed air). Alternatively, there is a quick setting agent supply device (see, for example, Patent Document 1) configured to add a quick setting agent to concrete.
Japanese Patent Laying-Open No. 2003-221119 (page 8, FIG. 1)

  However, since the quick setting agent is transported by the high-pressure air from the compressor, it is difficult to maintain the dry state of the quick setting agent, and the quick setting agent shortens the solidification time of the cement and develops early strength due to moisture. This may affect the original function of the agent and also cause clogging. At the same time, if the compressor is used as an air supply source, the structure of the tank of the quick-setting agent storage tank itself must be a pressure tank, which increases the manufacturing cost of the apparatus itself. Further, it is desired to reduce the size of the quick-setting agent addition tank.

  Then, the main subject of this invention is providing the quick-setting agent supply apparatus which improves supply efficiency of quick-setting agent and can supply continuously while reducing manufacturing cost.

The present invention that has solved the above problems is as follows.
<Invention of Claim 1>
The invention according to claim 1 is a storage tank for storing a quick setting agent, an addition device for discharging the quick setting agent stored in the storage tank, and an air for supplying the quick setting agent from the storage tank to the addition device. A blower as a supply source, and the addition device includes an upper chamber to which a quick-setting agent is supplied, a middle chamber connected to the lower part of the upper chamber, and a lower chamber connected to the lower part of the middle chamber And a rotary feeder provided below the lower chamber, and inside the middle chamber, a middle lift damper for opening and closing an opening between the upper chamber and the middle chamber is provided, and inside the lower chamber Is provided with a lower lift damper for opening and closing an opening between the middle chamber and the lower chamber, and a pipe connected to the lower chamber and the discharge side of the rotary feeder; A structure in which the lower chamber and the middle chamber are communicated by a communication pipe via a first valve, and the middle chamber and the upper chamber are communicated by a communication pipe via a second valve. A quick setting agent supply device comprising an air exhaust unit for discharging air when supplying the quick setting agent from the storage tank to the upper chamber through a filter. It is a supply device.

(Function and effect)
What is a supply device that air-conveys with compressed air from a conventional compressor by supplying air (acceleration) from the storage tank to the addition device (specifically, the upper chamber) by air from the blower? Unlikely, the quick setting agent is less likely to get wet. In addition, by providing a structure including an air exhaust unit that exhausts air through the filter when supplying the quick setting agent from the storage tank to the upper chamber, the supply of the quick setting agent is facilitated, The dust when supplying the quick setting agent is prevented from leaking outside.
Furthermore, by using the blower as an air supply source, the cost of the apparatus itself can be kept low without making the storage tank itself a pressure tank structure. By making the addition device into a three-layer (room) structure with an upper chamber, a middle chamber, and a lower chamber, the volume of each chamber can be reduced, and a pressure vessel with reduced manufacturing costs can be obtained.

<Invention of Claim 2>
According to a second aspect of the present invention, the air exhaust part is connected to the suction port of the blower on the outlet side thereof, and the quick setting agent is supplied to the upper chamber while the air is exhausted by the blower. The rapid setting agent supply device according to claim 1 .

(Function and effect)
Since the air supply source (blower) and the air exhaust source (blower) from the storage tank are the same thing, it is not necessary to provide them separately and the manufacturing cost can be reduced.

<Invention of Claim 3>
According to a third aspect of the present invention, the upper chamber, the middle chamber, and the lower chamber are each provided with a sensor that detects the amount of the quick setting agent, and the middle lift damper and the lower lift damper are based on data detected by these sensors. The rapid setting agent supply device according to claim 1 or 2, wherein opening and closing of the first valve and the second valve is controlled.

(Function and effect)
The upper chamber, the middle chamber, and the lower chamber are each provided with a sensor that detects the amount of the quick setting agent. Based on the data detected by these sensors, the middle lift damper, the lower lift damper, the first valve, and the second valve By adopting a configuration in which the opening and closing are controlled, the quick setting agent can be continuously discharged from the rotary feeder. Further, by linking the data detected by the sensor with the start and stop of the supply of the quick setting agent from the storage tank, the quick setting agent can be supplied efficiently by the adding device.

According to the present invention, the manufacturing cost can be reduced, the supply efficiency of the quick setting agent can be improved, and the continuous supply can be achieved.

Embodiments of the present invention will be described below.
The quick setting agent supply apparatus according to the present invention will be described with reference to FIGS. FIG. 1 is a schematic view of a quick setting agent supply apparatus according to the present invention, and FIGS. 2 to 7 are schematic views for explaining a work process of the quick setting agent supply apparatus.

The rapid setting agent supply apparatus which concerns on this invention is an apparatus which supplies rapid setting agent to concrete or mortar spraying equipment (a spraying nozzle, piping, etc.).
The quick setting agent supply device includes a storage tank 1 for storing the quick setting agent, an addition device 3 for discharging the quick setting agent stored in the storage tank 1, and a quick setting agent from the storage tank 1 to the addition device 2. And a blower 2 as an air supply source to be supplied. These are described in detail below.

<Storage tank>
The storage tank 1 has a filling port 11 provided at the top for filling the quick setting agent, a quick setting agent supply pipe 12 for supplying the quick setting agent, in which a quick setting agent inlet 12A is disposed, It has.

  The storage tank 1 has a substantially conical shape that tapers down as it goes downward, and the above-described filling port 11 is disposed at the upper portion in order to take in the quick-setting agent stored in the flexible container 60. . In addition, as a capacity | capacitance of the storage tank 1, what is necessary is just to store about 1-2 tons. A lid 11A is attached to the filling port 11 in order to prevent the quick setting material from being damp and to prevent the leakage of dust. Inside the storage tank 1, a quick setting agent supply pipe 12 is built, and its quick setting agent inlet 12A is located at the center of the substantially conical shaft of the storage tank 1 and above an air outlet 13 to be described later. ing. The lower end of the storage tank 1 is provided with an air outlet 13 composed of a nozzle or the like for ejecting air for transferring the stored quick setting agent upward, and a main air supply pipe connected to the air outlet 13. The quick setting agent enters the quick setting agent supply pipe 12 from the quick setting agent inlet 12A by the air from 4A. Further, a plurality of air outlets 14, 14,... (Only two locations are shown in FIG. 1) are provided below the storage tank 1, and the auxiliary air supply pipes 4B connected to the air outlets 14, 14,. 4B,... (Shown only in two places in FIG. 1), the quick setting agent that is powder in the storage tank 1 is fluidized by aeration action, and between the quick setting agent inlet 12A and the air outlet 13 It prevents the formation of rat holes that are likely to occur. The main air supply pipe 4A and the auxiliary air supply pipes 4B, 4B,... For supplying air to the air outlet 13 and the air outlets 14, 14... Are branched from the air supply main pipe 4 on the air inlet side. The main air supply pipe 4 is connected to a blowout port 2A of a blower 2 serving as an air supply source via a three-way ball valve 50.

  Since the air supply source is a blower, the pressure applied to the air is small, so that there is less risk of the quick setting material becoming damp than the compressor. The blower requires less air pressure than the compressor, but has a large air volume, so that it is possible to efficiently supply the quick setting agent. Further, since the storage tank does not need to be a pressure tank, it can be miniaturized and the manufacturing cost is remarkably reduced. Furthermore, since the inside of the storage tank is not at a high pressure, there is no risk of rupture, and even if it falls from a loading platform such as a truck, there is little risk of occurrence of a disaster due to rupture or the like.

  A filter 15 such as a bag filter is attached inside the storage tank 1, and the air in the storage tank 1 is exhausted from the air exhaust port via the filter 15. The air exhaust pipe 6A having an air exhaust port is configured to be opened and closed by a two-way ball valve 51, and is connected to the air exhaust main pipe 8 via the air exhaust pipe 6B. Is connected to the suction port 2B. When supplying quick setting agent stored in the flexible container 60 to the storage tank 1, the two-way ball valve 51 is opened and the air is exhausted to filter the dust of the quick setting agent that spreads in the storage tank 1. 15, and dust does not leak to the outside of the storage tank 1. In addition, when supplying to the storage tank 1, a supply port (not shown) formed in the lower portion of the flexible container 60 and the filling port 11 of the storage tank 1 are brought into close contact so that dust does not leak around here. Needless to say.

  Inside the storage tank 1, a lower limit sensor 16 and an upper limit sensor 17 are installed. When the quick setting agent stocked in the storage tank 1 falls below the position of the lower limit sensor 16, the lower limit sensor 16 detects it and quickly sets it on display means (not shown) via a computer (not shown). The stock shortage of the drug is displayed. And when supplying a quick setting agent in the storage tank 1, if it exceeds the position of the upper limit sensor 17, this upper limit sensor 17 will detect and it will display to a display means (not shown) via a computer (not shown). A message indicating that the supply of the quick setting agent should be stopped (for example, a warning) is displayed.

  The quick setting agent supply pipe 12 is connected to the quick setting agent supply pipe 5 at its outlet. The quick setting agent supply pipe 5 is connected to the quick setting agent inlet 3 a of the adding device 3.

<Adding equipment>
The addition device 3 includes an upper chamber 3A connected to the quick setting agent supply pipe 5, a middle chamber 3B connected to the lower side of the upper chamber 3A, a lower chamber 3C connected to the lower side of the middle chamber 3B, And a rotary feeder 35 provided below the lower chamber 3C. The lower portions of the chambers 3A, 3B, and 3C have a substantially conical shape that tapers downward. Further, inside the middle chamber 3B, a middle lift damper 31 that can be moved up and down to open and close the lower opening of the upper chamber 3A (upper opening of the middle chamber 3B) is provided by expansion and contraction of the air cylinder 31A. Similarly, a lower lift damper 32 that can be raised and lowered to open and close the lower opening of the middle chamber 3B (upper opening of the lower chamber 3C) is provided inside the lower chamber 3C by expansion and contraction of the air cylinder 32A.

  The upper chamber 3A is provided with an air exhaust part 34 having a cylindrical filter 33 such as a bag filter in the upper part thereof, and the quick setting agent is supplied to the upper chamber 3A from the quick setting agent inlet part 3a. Done. The upper chamber 3A is connected to the blower 2 via an air exhaust pipe 7 connected to the air exhaust unit 34, and is normally maintained at atmospheric pressure. The inside of the upper chamber 3A is hermetically sealed, and when the quick setting agent is supplied to the upper chamber 3A, the air is exhausted from the air exhaust pipe 7 connected to the air exhaust unit 34, thereby Supply is performed smoothly, and dust is adsorbed by the filter 33 to prevent leakage to the outside. The air exhaust pipe 7 is connected to an air exhaust main pipe 8, and the air exhaust main pipe 8 is connected to a suction port 2B of the blower 2 so that air from the blower circulates. For this reason, since the air supply source (blower) and the exhaust source (blower) of air from the storage tank are the same thing, it is not necessary to provide them separately and the manufacturing cost can be reduced. The emergency inlet 42 is supplied from here or used for inspection when it is necessary to urgently supply a quick setting agent, and is not particularly required as an invention. Absent.

  A compressed air supply pipe 55 is provided on the discharge side (downward) of the rotary feeder 35, and this compressed air supply pipe 55 is connected to a spray nozzle (not shown) for spraying concrete or mortar, The proximal end is connected to a compressor (not shown). The quick setting agent accommodated between the blades of the rotary feeder 35 is supplied to the compressed air supply pipe 55 stably and continuously. A communication main pipe 9 is branched from the compressed air supply pipe 55, and communication pipes 9 A, 9 B, and 9 C are branched to the communication main pipe 9. The communication pipe 9A is for making the pressure in the compressed air supply pipe 55 and the pressure in the lower chamber 3C the same pressure and facilitating the dropping of the quick setting agent. Similarly, the communication pipe 9B makes the pressure in the middle chamber 3B and the upper chamber 3A or the lower chamber 3C adjacent to the middle chamber 3B the same by opening / closing the first valve 91 or the second valve 92, thereby facilitating the dropping of the quick setting agent. Is. Since the upper chamber 3A is normally maintained at atmospheric pressure, the communication pipe 9C has a function of reducing the middle chamber 3B to atmospheric pressure by opening the second valve 92, and supplying the quick setting agent. The quick setting agent supplied from the pipe 5 is easily dropped into the middle chamber 3B.

  In addition, the addition device 3 is provided with a sensor for detecting the excess or deficiency of the quick-setting agent stock amount, that is, the upper limit and the lower limit. Specifically, a first (lower limit) sensor 36 and a second (upper limit) sensor 37 are attached to the lower chamber 3C, and a third (lower limit) sensor 38 and a fourth (upper limit) sensor are attached to the middle chamber 3B. 39 is attached, and a fifth (lower limit) sensor 40 is attached to the upper chamber 3A.

<Air exhaust pipes, etc.>
A compressed air supply pipe 53 is connected to the outlet of the compressor 52, and this compressed air supply pipe 53 is connected to a two-way electromagnetic valve 54. When the compressor 52 is in an operating state, whether or not compressed air is supplied is controlled by a two-way electromagnetic valve 54, and intermittent air pulse transmission to the filter 15 and air exhaust through the air exhaust pipe 6A. Intermittent air pulses can be transmitted to the filter 33 through the pipe 6A, the air exhaust pipe 6B, and the air exhaust pipe 7. With this intermittently supplied compressed air, the quick setting agent adhering to the filters 15 and 33 can be removed. Therefore, in order to prevent clogging of the filters 15 and 33, there is no need to open the inside of the apparatus and clean it frequently. This intermittent supply of compressed air is also performed when air is exhausted through the air exhaust pipes 6A, 6B, and 7. The intermittent supply of compressed air is preferably performed at intervals of about 30 seconds to 1 minute for about 0.2 seconds.

  As described above, when the quick setting agent stored in the flexible container 60 is supplied to the storage tank 1, if the two-way ball valve 51 is opened and the air is exhausted, the quick setting spreads in the storage tank 1. The dust of the agent can be attached to the filter 15, and the dust does not leak out of the storage tank 1. Further, when the quick setting agent is supplied to the adding device 3, the two-way ball valve 51 may be closed so that air is exhausted only from the air exhaust part 34.

  If the air from the outlet 2A of the blower 2 is supplied to the air supply main pipe 4 by switching the three-way ball valve 50, the air can also be sent to the main air supply pipe 4A and the auxiliary air supply pipes 4B and 4B described above. In addition, the air can be exhausted as it is sent to the air exhaust port 4C. That is, these two modes can be selected by switching. Note that it is also possible to select the case of sending the air to the air exhaust port 4C and exhausting the air as it is, when the quick setting agent stored in the flexible container 60 is supplied to the storage tank 1 in the filter 15. This is because the air entered from the air exhaust port is exhausted from the air exhaust port 4C through the air exhaust tubes 6A and 6B, the air exhaust main tube 8 and the suction port 2B of the blower 2.

<Working process of quick setting agent supply device>
The work process of the quick-setting agent supply device will be described mainly with reference to FIGS.

  As shown in FIG. 2, the lower lift damper 32 closes the lower opening of the middle chamber 3B (the upper opening of the lower chamber 3C) and closes the first valve 91, thereby connecting the main main pipe 9 and the communication pipe 9A. The compressed air supply pipe 55 and the lower chamber 3C are kept at the same pressure. By operating the rotary feeder 35 in this state, the quick setting agent is smoothly supplied into the compressed air supply pipe 55 and added to the concrete or mortar at the front end side.

  If the quick setting agent is continuously supplied in the above state, as shown in FIG. 3, the stock amount of the quick setting agent in the lower chamber 3 </ b> C decreases and falls below the position of the first (lower limit) sensor 36. When the quick setting agent falls below the position of the first (lower limit) sensor 36, the first (lower limit) sensor 36 detects and the quick setting agent is sent to the display means (not shown) via a computer (not shown). Stock shortage is displayed. At the same time, as shown in FIG. 4, the lower lift of the upper chamber 3A (upper opening of the middle chamber 3B) is closed by the middle lift damper 31, and then the first valve 91 is opened (the second valve 92 is closed). The middle chamber 3B and the lower chamber 3C are brought to the same pressure by the communication pipes 9A and 9B. In this state, the lower lift damper 32 is lowered, the lower opening of the middle chamber 3B (the upper opening of the lower chamber 3C) is opened, and the quick setting agent in the middle chamber 3B flows down into the lower chamber 3C. Quick setting agent is supplied.

  As shown in FIG. 5, when the quick setting agent is supplied into the lower chamber 3C, the shortage of the quick setting agent is detected by the third (lower limit) sensor 38 in the middle chamber 3B, or the lower chamber 3C has When either the second (upper limit) sensor 37 detects that the quick-setting agent stock is full, the lower lift damper 32 is raised, the lower opening of the middle chamber 3B (the upper opening of the lower chamber 3C) is closed, and the first valve 91 is Closed.

  Then, as shown in FIG. 6, the second valve 92 is opened (the first valve 91 is closed), and the upper chamber 3A and the middle chamber 3B are brought to the same pressure (atmospheric pressure) by the communication pipes 9B and 9C. In this state, the middle lift damper 31 is lowered and the lower opening of the upper chamber 3A (the upper opening of the middle chamber 3B) is opened. At the same time, the quick setting agent in the storage tank 1 is supplied into the upper chamber 3A from the quick setting agent inlet 3a via the quick setting agent supply pipe 5, and this quick setting agent flows down into the middle chamber 3B. A quick setting agent is supplied into the chamber 3B.

  As shown in FIG. 7, when the quick setting agent is supplied into the middle chamber 3B, the shortage of the quick setting agent is detected by the fifth (lower limit) sensor 40 in the upper chamber 3A, or in the middle chamber 3B. The supply of the quick setting agent from the inside of the storage tank 1 is automatically stopped by either the detection of the quick setting agent stock full by the fourth (upper limit) sensor 39. Thereafter, returning to the state of FIG. 2, the above operation is repeated.

  Regarding the detection of shortage of the quick setting agent by the third (lower limit) sensor 38 in the middle chamber 3B and the detection of the full stock of the quick setting agent by the second (upper limit) sensor 37 in the lower chamber 3C in the above work process. Since either one of the detections is sufficient, either the third (lower limit) sensor 38 or the second (upper limit) sensor 37 may be omitted. Similarly, either detection of shortage of the quick setting agent by the fifth (lower limit) sensor 40 in the upper chamber 3A or detection of full stock of the quick setting agent by the fourth (upper limit) sensor 39 in the middle chamber 3B. Since only one of the detections is sufficient, either the fifth (lower limit) sensor 40 or the fourth (upper limit) sensor 39 may be omitted.

  Further, in the above work process, the first valve 91 and the second valve are manually detected by the worker by displaying the detection result (the excess or deficiency of the quick setting agent) on the display means via the computer and allowing the worker to recognize it. The opening and closing of 92, the opening and closing of the middle lift damper 31 and the lower lift damper 32, the supply of quick setting agent from the inside of the storage tank 1, etc.

It is the schematic of the quick setting agent supply apparatus which concerns on this invention. It is the schematic (1) for demonstrating the operation | work process of a quick setting agent supply apparatus. It is the schematic (2) for demonstrating the operation | work process of a quick setting agent supply apparatus. It is the schematic (3) for demonstrating the operation | work process of a quick setting agent supply apparatus. It is the schematic (4) for demonstrating the operation | work process of a quick setting agent supply apparatus. It is the schematic (5) for demonstrating the operation | work process of a quick setting agent supply apparatus. It is the schematic (6) for demonstrating the operation | work process of a quick setting agent supply apparatus.

  DESCRIPTION OF SYMBOLS 1 ... Containment tank, 2 ... Blower, 2A ... Outlet, 2B ... Suction port, 3 ... Addition apparatus, 3A ... Upper chamber, 3B ... Middle chamber, 3C ... Lower chamber, 3a ... Rapid setting agent inlet part, 4 ... Air Supply main pipe, 4A ... main air supply pipe, 4B ... auxiliary air supply pipe, 4C ... air exhaust port, 5 ... quick setting agent supply pipe, 6A, 6B ... air exhaust pipe, 7 ... air exhaust pipe, 8 ... air exhaust Main pipe, 9 ... Communication main pipe, 9A ... Communication pipe, 9B ... Communication pipe, 9C ... Communication pipe, 11 ... Filling port, 11A ... Ladder, 12 ... Quick setting agent supply pipe, 12A ... Quick setting agent inlet, 13 ... Air outlet, 14 ... Air outlet, 15 ... Filter, 16 ... Lower limit sensor, 17 ... Upper limit sensor, 31 ... Middle lift damper, 31A ... Air cylinder, 32 ... Lower lift damper, 32A ... Air cylinder, 33 ... Filter, 34 ... Air exhaust Part, 35 ... Rotary 36, first (lower limit) sensor, 37 ... second (upper limit) sensor, 38 ... third (lower limit) sensor, 39 ... fourth (upper limit) sensor, 40 ... fifth (lower limit) sensor, 42 ... Emergency inlet, 50 ... three-way ball valve, 51 ... two-way ball valve, 52 ... compressor, 53 ... compressed air supply pipe, 54 ... two-way electromagnetic valve, 55 ... compressed air supply pipe, 60 ... flexible container, 91 ... 1st valve, 92 ... 2nd valve.

Claims (3)

A storage tank for storing the quick setting agent, an addition device for discharging the quick setting agent stored in the storage tank, and a blower as an air supply source for supplying the quick setting agent from the storage tank to the addition device, Prepared,
The addition device is provided in an upper chamber to which a quick setting agent is supplied, a middle chamber connected to the lower part of the upper chamber, a lower chamber connected to the lower part of the middle chamber, and a lower part of the lower chamber. A rotary feeder,
A middle lift damper that opens and closes an opening between the upper chamber and the middle chamber is provided inside the middle chamber, and a lower lift damper that opens and closes an opening between the middle chamber and the lower chamber is provided inside the lower chamber. Provided,
The lower chamber and the pipe connected to the discharge side of the rotary feeder are communicated by a communication pipe, and the lower chamber and the middle chamber are communicated by the communication pipe via the first valve, and the middle chamber and the upper chamber are connected to each other. A quick setting agent supply device configured to be connected by a communication pipe via a second valve;
The upper chamber is equipped with an air exhaust unit that exhausts air through the filter when supplying quick setting agent from the storage tank.
A quick setting agent supply device characterized by that. The air exhaust unit is connected to the suction port of the blower at its outlet side, wherein the quick-setting admixture supply to the upper chamber, which is configured to be performed while evacuating the air by the blower, according to claim 1, wherein Quick setting agent supply device. In the upper chamber, the middle chamber, and the lower chamber, sensors for detecting the amount of quick setting agent are attached, respectively.
3. The quick setting agent supply device according to claim 1, wherein opening and closing of the middle lift damper, the lower lift damper, the first valve and the second valve are controlled based on data detected by these sensors. .

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