JP2014001624A - Centrifugal rotary spray machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a centrifugal rotary spray machine capable of adjusting a spray amount and a spray position of an earth-retaining material.SOLUTION: A centrifugal rotary spray machine for lining inner wall of a vertical shaft with an earth-retaining material includes: a drum 20 held in the vertical shaft and storing the earth-retaining material; a spraying part 24 held rotatably in a horizontal plane with respect to the drum 20 below the drum 20, and comprising a filling space filled with the earth-retaining material and a nozzle for jetting outside the filled earth-retaining material; a rotating mechanism for rotating the spraying part 24 in the horizontal plane; a first material hose 80 for guiding the earth-retaining material stored in the drum 20 to the filling space; a first fluid hose 66 and an accelerating agent hose 68 for guiding a compression fluid and an accelerating agent from the outside of the vertical shaft into the filling space, respectively; and a changeover mechanism for changing over the jetting amount of the earth-retaining material jetted from the nozzle by receiving a supply of the compression fluid.

Description

  The present invention relates to a concentric rotary sprayer used when spraying earth retaining material on a shaft inner wall.

  In foundation foundation work such as piers, abutments, and steel towers, a shaft for deep foundation foundation formation has been excavated in the ground, and then the shaft is reinforced by spraying earth retaining material such as cement material onto the inner wall of the shaft. Was doing the lining. As an apparatus for such lining, for example, Patent Documents 1-4 and the like are known.

  In Patent Documents 1-3, a tank containing earth retaining material is hung inside the shaft, and the quick setting agent is added to the earth retaining material from the quick-setting agent supply device arranged below the tank, and then this is added at high speed. An apparatus for spraying earth retaining material onto the surface of a shaft inner wall using the centrifugal force of a rotating impeller is disclosed.

  Further, in Patent Document 4, earth retaining material, quick setting agent, and compressed air are supplied from outside the shaft through a hose to spraying means capable of rotation control in a horizontal plane in the shaft, and the pressure of the compressed air An apparatus for spraying earth retaining material on the inner wall of a shaft using the above is disclosed.

Japanese Patent No. 2812666 Japanese Patent No. 2965494 Japanese Patent No. 2965495 JP 2013-112970 A

  Here, according to the apparatus described in Patent Documents 1-3, since a large amount of earth retaining material can be sprayed, rapid lining becomes possible. On the other hand, since these devices spray the earth retaining material using centrifugal force, the earth retaining material is uniformly applied to the inner wall surface of the same depth. Considering this, there was a problem that the spraying amount and spraying position could not be adjusted.

  In the device described in Patent Document 4, the position of the spraying means is controlled by a motor drive, and since the earth retaining material is sprayed by the pressure of compressed air, the spraying position can be adjusted freely. Can do. However, even with the device described in Patent Document 4, it is difficult to adjust the spray amount. Moreover, in this apparatus, since the earth retaining material is supplied from the outside of the shaft through a hose, the supply amount per unit time tends to decrease, and the spraying amount tends to decrease. As a result, the device described in Patent Document 4 is not suitable for a large-diameter shaft having a large lining area.

  Accordingly, an object of the present invention is to provide a concentric rotary sprayer that can adjust the spray amount and spray position of the earth retaining material.

  A concentric rotary spraying machine according to the present invention is a concentric rotary spraying machine for lining a retaining material on the inner wall of a shaft, a drum held in the shaft and storing the retaining material, and below the drum A spraying section that is rotatably held in a horizontal plane with respect to the drum, and includes: a filling space filled with the earth retaining material; and a nozzle that ejects the filled earth retaining material to the outside. A spraying part, a rotating mechanism for rotating the spraying part in a horizontal plane, a first material hose for guiding the earth retaining material stored in the drum to the filling space, and from outside the shaft into the filling space A first fluid hose and a quick setting agent hose for guiding the compressed fluid and the quick setting agent, and a switching mechanism for switching an ejection amount of the earth retaining material ejected from the nozzle in response to the supply of the compressed fluid. Characterized by

  In a preferred aspect, the earth retaining material supplied from the outside of the shaft is led into the filling space, and a second material hose having a smaller diameter than the first material hose is provided. In this case, further, a first sending means for sending the earth retaining material in the drum to the first material hose, and a second sending means for sending the earth retaining material outside the shaft to the second material hose, It is desirable that the supply source of the earth retaining material to the filling space can be switched by switching the driving of the first and second delivery means.

  In another preferred aspect, the switching mechanism is provided at a boundary between the nozzle and the filling space to partition the nozzle and the filling space, and is disposed adjacent to each other, and the movable plate. A moving mechanism for moving the stationary plate with respect to the stationary plate, wherein one or more passage holes are formed in one of the stationary plate and the movable plate, and the other of the stationary plate and the movable plate is mutually connected. A plurality of adjustment holes having different diameters are formed, with the movement of the movable plate, only a part of which is in communication with the passage hole and the other is closed by one of the stationary plate and the movable plate. ing.

  According to the present invention, since the ejection amount of the earth retaining material ejected from the nozzle can be switched, not only the spraying position of the earth retaining material but also the spray amount can be adjusted.

It is a figure which shows the use condition of the concentric rotary sprayer which is embodiment of this invention. It is a figure which shows the whole structure of a mine unit. It is a figure which shows the structure of a relay part periphery. It is a perspective view of a spraying part. It is a figure which shows the structure of a spraying part.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing a use state of a concentric rotary sprayer according to an embodiment of the present invention. Centrifugal rotary sprayers are roughly classified into an underground unit 10 that is suspended and held inside the shaft 100, and an outside unit 12 that is provided outside the shaft. The underground unit 10 has a drum 20 for storing a cement-based material (earth retaining material) such as mortar. At the time of lining (earth retaining), the drum 20 is suspended and held in the shaft 100 by a crane 102 or the like provided around the shaft 100 as shown in FIG. The crane 102 appropriately changes the height of the underground unit 10 including the drum 20 according to the lining location.

  The outside unit 12 installed around the shaft 100 includes a material supply device 15 that supplies cement-based material into the shaft 100, an air supply device 16 that supplies compressed air into the shaft 100, and a quick setting agent for the shaft 100. It has a quick setting agent supply device 18 for supplying it into the inside, a hydraulic pressure generating device 19 for driving the hydraulic motor, and a control device (not shown) for controlling the driving thereof. Each supply apparatus 15,16,18 is connected with the drum 20 or the spraying part 24 in the shaft 100 via the supply hoses 25,26,28. In FIG. 1, the number of the air supply hose 26 and the quick setting agent supply hose 28 is shown to be smaller than the actual number for ease of viewing. In practice, as shown in FIG. 2, the air supply hose 26 is bifurcated in the middle and extends to the drum 20 and the relay portion 22, respectively. Further, the quick setting agent supply hose 28 is also bifurcated in the middle, and extends to the drum 20 and the relay portion 22, respectively. Each supply device 15, 16, 18 is provided with a pump for fluid transfer. By controlling the drive of this pump, the supply amount of cementitious material, compressed air, and quick setting agent is adjusted. The

  A blowing unit 24 is provided below the drum 20. The spray unit 24 can rotate in a horizontal plane with respect to the drum 20. The spray wall 24 rotates concentrically in a horizontal plane while blowing out cementitious material, whereby the inner wall of the shaft 100 is lined. However, as will be described in detail later, the spraying portion 24 of the present embodiment is not always rotated during spraying, and the cement-based material is kept stationary at a specific rotation angle as necessary. It is also possible to spray. By spraying the cement-based material in a stationary state at a specific rotation angle in this way, the spraying position can be adjusted in consideration of the state of the inner wall surface of the shaft 100 (the presence or absence of unevenness, the difference in soil quality, etc.), and more suitable Lining is possible.

  Next, the configuration of the underground unit 10 will be described in more detail with reference to FIG. FIG. 2 is a diagram illustrating the overall configuration of the underground unit 10. The underground unit 10 relays the drum 20 storing the cement-based material, the spraying unit 24 attached below the drum 20, and the compressed air, quick setting agent, and cement-based material supplied to the spraying unit 24. It is roughly divided into the relay unit 22.

  As described above, the drum 20 is a container that is suspended and held in the shaft 100 by the crane 102. As shown in FIG. 2, the drum 20 of this embodiment has a substantially funnel shape roughly divided into a conical conical portion 20a and a cylindrical portion 20b connected to the lower end of the conical portion 20a. However, the shape illustrated here is an example, and the shape of the drum 20 is not particularly limited as long as a sufficient amount of cementitious material can be stored. A top plate 20c is provided at the upper end opening of the drum 20, and an agitation motor 31 for driving the feeder 29 is installed on the top surface of the top plate 20c. The stirring motor 31 is preferably one that can change the rotational speed stepwise or steplessly. The drive type may be electric or hydraulic. An example of the former is an inverter control motor.

  The feeder 29 is a rotary type having a mixing and stirring function, and a screw is used in this embodiment. The feeder 29 has an axis concentric with the drum 20, and as shown in FIG. 2, the upper end of the shaft portion 29a is attached to the top plate 20c via a bearing (not shown). The lower end of the shaft portion 29a extends to the inside of the cylindrical portion 20b of the drum 20, and a stirring blade 29b is formed in a portion of the shaft portion 29a that has entered the cylindrical portion 20b. The stirring blade 29b has a slightly smaller diameter than the cylindrical portion 20b, and the stirring blade 29b remains stationary, thereby preventing the cementitious material accommodated in the drum 20 from falling. As the stirring blade 29b rotates in a specific direction, the cementitious material is fed downward while being stirred.

  A material sensor 32 (see FIG. 3) for detecting the presence or absence of cementitious material is provided in the vicinity of the boundary between the conical portion 20a and the cylindrical portion 20b of the drum 20. When the cementitious material in the drum 20 is consumed and its liquid level falls below the material sensor 32, a specific signal is output from the material sensor 32. When this signal is output, the operation of the concentric rotary sprayer is temporarily stopped, the underground unit 10 is pulled out of the shaft, and the drum 20 is supplied with cement-based material.

  A vibration generator 30 such as a vibration motor is fixed to the outer wall of the conical portion 20a of the drum 20. By generating vibration by the vibration generating device 30 and exciting the drum 20, the cement-based material in the conical portion 20a can be smoothly and smoothly transferred downward, that is, toward the cylindrical portion 20b.

  The relay part 22 is a part for relaying the transfer of compressed air, quick setting agent, and cement-based material to the spraying part 24. The configuration of the relay unit 22 will be described in detail with reference to FIG. FIG. 3 is a schematic cross-sectional view around the cylindrical portion 20b.

  The relay unit 22 is roughly divided into a stationary substrate 40 fixed to the drum 20 and a rotating body 42 that is installed to be rotatable with respect to the stationary substrate 40. The stationary substrate 40 is a plate material fixed to the cylindrical portion 20b of the drum 20 via the housing 50, and its position and posture are not changed. A connection block 52 is fixed to the bottom surface of the stationary substrate 40 with bolts. The stationary substrate 40 has four through holes 45, 46, and 48 that penetrate in the thickness direction. The material hole 45 is a hole through which the cement-based material passes, and the material supply hose 25 is connected to the upper end opening thereof. Similarly, the air hole 46 and the quick setting agent hole 48 are holes through which the compressed air and the quick setting agent pass, respectively, and the air supply hose 26 and the quick setting agent supply hose 28 are provided at the upper end openings thereof. It is connected. The motor shaft hole 43 formed in the vicinity of the periphery of the stationary substrate 40 is a hole through which the rotation shaft 44 a of the hydraulic motor 44 installed on the upper surface of the stationary substrate 40 passes.

  The rotating body 42 is a block provided below the stationary substrate 40. The rotating body 42 is attached to the periphery of the connecting block 52 fixed to the bottom surface of the stationary substrate 40 through bearings 54a, 54b, and 54c in close contact with the stationary substrate 40. It can be rotated in the horizontal plane as the center of rotation. The number and type of the bearings 54a, 54b, 54c are not particularly limited as long as the rotating body 42 can rotate in the horizontal plane with respect to the connection block (and consequently the stationary substrate 40). In the present embodiment, the rotating body 42 includes a total of three bearings including two single-row deep groove ball bearings 54a and 54c and self-aligning roller bearings 54b provided between the two single-row deep groove ball bearings 54a and 54c. Holding. Even if a large load is applied in the thrust direction (vertical direction) or radial direction (horizontal direction), the single row deep groove ball bearings 54a and 54c and the self-aligning roller bearing 54b are used in combination. The body 42 can be smoothly rotated.

  Three annular grooves 55, 56, 58 formed concentrically around the rotation center axis of the rotating body 42 are formed on the upper surface of the rotating body 42. The material annular groove 55 is an annular groove formed in a diameter and a width corresponding to the material hole 45. That is, the width of the material annular groove 55 is approximately equal to the diameter of the material hole 45, and the center diameter (average diameter) of the material annular groove 55 is approximately the distance from the rotation center axis to the center of the material hole 45. equal. Therefore, even if the rotating body 42 rotates about the rotation center axis, the material hole 45 is always located immediately above the material annular groove 55, and the material annular groove 55 and the material hole 45 The communication state of is maintained. Similarly, the annular groove for air 56 and the annular groove for quick setting agent 58 are annular grooves formed in a diameter and a width corresponding to the hole for air 46 and the hole for quick setting agent 48, respectively. Even if it rotates, it is a groove | channel which always maintains a communication state with the corresponding holes 46 and 48.

  An elastic member such as an O-ring 60 is disposed in the vicinity of the inner peripheral edge and the outer peripheral edge of each annular groove 55, 56, 58, and the inside of the annular grooves 55, 56, 58 is kept airtight. Each annular groove 55, 56, 58 is formed with a communication hole penetrating in the thickness direction. A second material hose 65, a first air hose 66, and a first quick setting hose 68 that connect the through hole and the blowing portion 24 are fitted in each through hole.

  A plurality of teeth 62 are formed on the outer peripheral surface of the rotating body 42, and the entire rotating body 42 functions as one large gear. A driving gear 70 that meshes with the rotating body 42 that functions as the gear is attached to the rotating shaft 44 a of the hydraulic motor 44. Then, as the hydraulic motor 44 is driven, the driving gear 70 is rotated so that the rotating body 42 can be rotated.

  A mounting hole to which the hose rotary tube 72 is attached is formed on the bottom surface of the connection block 52. The hose rotary tube 72 is a tube that is rotatable with respect to the drum 20 by being attached to the connection block 52 via the bearing 74 in a state of being inserted into the cylindrical portion 20 b of the drum 20. A holder 76 for holding the first material hose 80 is fixed to the hose rotary tube 72. The first material hose 80 is a hose that guides the cement-based material stored in the drum 20 to the spraying portion 24. The tip opening of the first material hose 80 is provided in close proximity to the lower end opening of the cylindrical portion 20 b of the drum 20, and the cement-based material falling from the cylindrical portion 20 b flows into the first material hose 80. It is like that. In addition, as described above, the first material hose 80 is fixed to the hose rotary tube 72 that can rotate with respect to the drum 20, and thus can rotate with respect to the drum 20.

  Next, the structure of the spray part 24 is demonstrated with reference to FIG. 4, FIG. FIG. 4 is a perspective view of the spraying part 24, and FIG. 5 is a schematic sectional view of the spraying part 24. The spraying part 24 sprays cement-based material onto the shaft inner wall 100a, and is fixed to the rotating body 42 via the mounter 82 (see FIG. 2), and rotates around the rotation center axis together with the rotating body 42. It is possible.

  The spraying part 24 has a main body 84 that is a cylindrical hollow member. The main body 84 is roughly divided into a filling portion 86 filled with a cement-based material and a nozzle portion 88 that ejects the filled cement-based material. The nozzle portion 88 is a substantially conical portion having an opening at the tip and having a smaller diameter as the tip is approached. Cement-based material is blown out from the tip opening of the nozzle portion 88.

  The filling part 86 is a part for filling a certain amount of cementitious material. A plurality of hoses 65, 66, 68, and 80 are connected to the filling portion 86. That is, the first material hose 80 and the second material hose 65 are connected to the rear end of the filling portion 86. As described above, the first material hose 80 is a hose that connects the drum 20 and the spray portion 24. The second material hose 65 is a hose that connects the blowing unit 24 and the material supply device 15 via the material annular groove 55, the material supply hose 25, and the like. The first material hose 80 has a larger diameter than the second material hose 65, and the flow rate sent per unit time is larger than that of the second material hose 65.

  Further, a quick setting agent hose 68 is connected to a position in the vicinity of the end portion on the side close to the nozzle portion 88 in the filling portion 86. The quick setting agent hose 68 is a hose that connects the spray unit 24 and the quick setting agent supply device 18 via the quick setting agent annular groove 58, the quick setting agent supply hose 28, and the like. An air hose 66 that connects the blowing portion 24 and the air supply device 16 via the air annular groove 56, the air supply hose 26, and the like is a quick setting agent hose 68 immediately before the blowing portion 24. It is connected to. As a result, a mixed fluid of quick setting agent and compressed air flows into the filling portion 86. The quick setting agent supplied to the filling part 86 together with the compressed air receives the pressure of the compressed air, mixes with the cement material filled in the filling part 86, and jets out together with the cement material to the nozzle part 88.

  The movable plate 90 and the stationary plate 92 are plate members provided at the boundary between the nozzle portion 88 and the filling portion 86 so as to partition the nozzle portion 88 and the filling portion 86 and arranged adjacent to each other. The stationary plate 92 has one passage hole 92a through which the cement-based material filled in the filling portion 86 passes. The passage hole 92a is provided at a position and size that do not overlap with the center axis of the main body (the rotation center axis of the movable plate 90 described later).

  The movable plate 90 is a plate material that can rotate around the central axis of the main body. The movable plate 90 is formed with two adjustment holes 90a and 90b having different diameters, that is, a small adjustment hole 90a and a large adjustment hole 90b larger in diameter than the small adjustment hole 90a. The two adjustment holes 90a and 90b are arranged on the same circumference centering on the rotation center axis, and the distance from the center of each adjustment hole 90a and 90b to the rotation center axis is from the passage hole 92a to the rotation center axis. Is almost equal to the distance. Further, the two adjustment holes 90 a and 90 b are formed at positions where the other is closed by the stationary plate 92 when one of the adjustment holes 90 a and 90 b communicates with the passage hole 92 a as the movable plate 90 moves. FIG. 5 shows a state in which the large adjustment hole 90 b communicates with the passage hole 92 a and the small adjustment hole 90 a is closed by the stationary plate 92.

  A gear ring 94 which is an annular member having a plurality of teeth formed on the outer peripheral surface thereof is fixed to the outer periphery of the movable plate 90, and the movable plate 90 rotates in conjunction with the gear ring 94. A motor accommodating portion 97 is formed so as to protrude from the outer wall of the main body of the blowing portion 24. The motor accommodating portion 97 is a part for installing and accommodating a hydraulic motor 98 for driving the movable plate 90. A gear 96 that meshes with the gear ring 94 is attached to the rotating shaft of the hydraulic motor 98, and the movable plate 90 rotates as the hydraulic motor 98 is driven.

  In the present embodiment, the hydraulic motor 98 is driven to rotate the movable plate 90, and the passage holes 92a and thus the adjustment holes 90a and 90b communicating with the filling portion 86 are switched. By appropriately changing the adjustment holes 90a and 90b communicating with the filling portion 86, the amount of the cementitious material ejected from the nozzle portion 88 can be changed. In other words, the stationary plate 92, the movable plate 90, and the moving mechanism for moving (rotating) the movable plate 90 (hydraulic motor 98, gear 96, gear ring 94, etc.) are ejected from the nozzle part 88. Functions as a switching mechanism.

  In addition, the structure of the switching mechanism demonstrated here is an example, and another structure may be sufficient if the ejection amount can be changed. For example, in the present embodiment, the movable plate 90 is rotated. However, if the adjustment hole communicating with the passage hole 92a is switched with the movement, the rotation plate may be moved linearly. In the present embodiment, the adjustment hole is formed in the movable plate 90 and the passage hole 92a is formed in the stationary plate 92. Conversely, the passage hole may be formed in the movable plate 90 and the adjustment hole may be formed in the stationary plate 92. . Furthermore, in this embodiment, one passage hole 92a and two adjustment holes 90a and 90b are provided. However, the diameter of the hole communicating with the filling portion 86 can be changed with the relative movement of the movable plate 90 and the stationary plate 92. If present, the number may be changed as appropriate. Furthermore, the switching mechanism may be configured using a control valve or the like whose flow rate can be changed without using the stationary plate 92, the movable plate 90, and the like.

  Next, the flow at the time of performing lining with the above-configured liner will be described. As described above, when lining is performed, the drum 20 is suspended and held in the shaft 100, and the spray portion 24 is positioned at a desired height. Then, the cement-based material is sprayed from the nozzle tip of the spraying portion 24 toward the shaft inner wall 100a by feeding the cement-based material, the quick setting agent, and the compressed air into the filling portion 86 of the spraying portion 24. At this time, the cementitious material can be sprayed to a desired position by driving the hydraulic motor 44 and rotating the rotating body 42 and, consequently, the spraying portion 24 in a horizontal plane. Here, in the present embodiment, the cementitious material is sprayed with the pressure of compressed air without using centrifugal force, and the rotation angle and rotation speed of the spraying portion 24 are controlled by driving the motor. . Therefore, the spraying position can be adjusted in consideration of the state of the inner wall surface of the shaft 100, and a more suitable earth retaining (lining) operation can be performed.

  Here, even with the apparatus described in Patent Document 4, it is possible to control the rotation angle and rotation speed of the spraying section 24. However, in the case of the apparatus described in Patent Document 4, cement-based material is always supplied from outside the shaft through a hose. In the case of supplying the material from outside the shaft through the hose, there is a limit to the spraying amount per unit time because the transfer amount per unit time is limited. As a result, the device described in Patent Document 4 is not suitable for the lining of the shaft 100 having a relatively large diameter (the shaft 100 having a large inner wall area). Of course, it is possible to increase the amount of material sprayed by increasing the diameter of the hose, but in that case, a large pump or the like is required to deliver the material, increasing the size and cost of the device. Invite.

  On the other hand, in this embodiment, the cement-based material is stored in the drum 20 in advance, and the cement-based material is sent out from the drum 20, so that a large amount of material can be supplied to the spraying unit 24 per unit time. As a result, according to this embodiment, a large amount of material can be blown out, and a large area can be retained in a relatively short time.

  However, depending on the state of the inner wall surface of the shaft 100 (such as the presence or absence of irregularities), it may be desirable that the spraying amount per unit time is small. In order to solve this problem, in this embodiment, the spraying unit 24 is provided with a switching mechanism that switches the amount of the cement-based material ejected. By appropriately changing the material ejection amount from the nozzle portion 88 by the switching mechanism, it is possible to spray the cement-based material with the ejection amount corresponding to the inner wall surface. Therefore, for example, in a scene where spraying over a large area is necessary, the spraying amount per unit time can be increased by spraying the cement-based material with the large adjustment hole 90b communicating with the filling portion 86. It is possible to hold a large area in a relatively short time. On the other hand, if you want to spray a small amount of material, for example, after retaining the entire inner wall surface of the shaft 100, if you want to spray additional material only to some locations (change the thickness of the retaining wall only partially) For example, when spraying cement-based material with the small adjustment hole 90a communicating with the filling portion 86, the spraying amount per unit time can be reduced and the lining can be performed more flexibly. Can do.

  By the way, when the cement-based material is supplied from the drum 20, the supply amount per unit time can be increased, but the total amount of material that can be supplied to the spraying unit 24 is limited. When the cement-based material stored in the drum 20 runs out, the crane 20 or the like is used to pull up the drum 20 to the outside of the shaft 100 to replenish the drum 20 with the cement-based material, and then the shaft 100 again. It is necessary to suspend the drum 20 in the interior. Such operations of lifting the drum 20, replenishing the material, and suspending the drum 20 are very complicated and time-consuming.

  Therefore, in this embodiment, the supply source of the cement-based material is switched according to the required ejection amount. That is, when a large ejection amount is required, the feeder 29 is driven while stopping the pump built in the material supply device 15, and when a small ejection amount is sufficient, the feeder 29 is stopped while the shaft is stopped. The drive of the material supply apparatus 15 provided outside is started, and the cementitious material is supplied to the spraying part 24 from the material supply apparatus 15 through the hose. When the material is supplied from the outside of the shaft 100, the supply amount per unit time tends to be small, but when the ejection amount per unit time is small, even if the supply amount per unit time is small, there is no problem. And like this embodiment, the consumption of the cementitious material stored by the drum 20 can be reduced by switching the supply source of a cementitious material according to the amount of ejection required, and eventually, The number of operations of lifting the drum 20, re-storing the material, and suspending the drum 20 can be reduced, and a more efficient lining operation becomes possible.

  In addition, when changing the supply source (supply amount) of cementitious material, it is desirable to also change the supply amount of compressed air and a quick setting agent. For example, the supply amount of the compressed air / quickening agent may be changed on the pump side built in the air supply device 16 or the quick setting agent supply device 18, or the air hose 66 or the rapid setting agent may be used. The hose 68 may be provided with some flow rate adjusting valve.

  As apparent from the above description, according to the present embodiment, not only the spraying position of the cement-based material but also the spraying amount can be adjusted, so that the lining can be made more flexibly. Moreover, since a cement-based material is supplied from the outside of the shaft 100 when ejecting a small amount from the drum 20 when ejecting a large amount, the number of times of lifting and lowering the drum 20 can be reduced and more efficient. Lining work is possible.

  In addition, the structure demonstrated here is all an example, and if it has the spraying part 24 which can change ejection amount and a rotation angle, and the drum 20 which stored the cement-type material, the other structure is suitably It may be changed. For example, in this embodiment, the cement-based material is supplied also from the outside of the shaft 100, but the cement-based material may be supplied only from the drum 20. Moreover, although the spraying part 24 of this embodiment can be rotated only in a horizontal plane, it may be configured such that it can go straight in the horizontal direction and rotate around the horizontal axis. For example, a rectilinear mechanism composed of a motor, a slide rail, or the like may be interposed between the mounter 82 that holds the spraying part 24 and the rotating body 42 so that the spraying part 24 can travel straight in the horizontal direction. When the ejection amount is small and the ejection pressure is small (the material scattering distance is short), the spraying part 24 is moved in a direction approaching the shaft inner wall 100a, and conversely, the ejection amount is large and the ejection pressure is large. When (the scattering distance of the material is long), the blowing part 24 may be moved in a direction away from the shaft inner wall 100a. By setting it as this structure, a cement-type material can be made to reach the shaft inner wall 100a more appropriately.

  Furthermore, in this embodiment, compressed air and quick setting agent are also supplied to the inside of the drum 20, but if compressed air and quick setting agent can be supplied to the inside of the filling unit 86 of the spraying part 24, The supply of compressed air and quick setting agent to the inside of the drum 20 may be omitted. As another form, a cement-based material may be supplied into the drum 20 from the outside of the shaft 100 via a hose or the like. By supplying cement-based material to the drum 20 from the outside of the shaft 100, the speed at which the amount of material stored in the drum 20 decreases can be reduced. As a result, the drum 20 is lifted and the material is stored again, and the drum 20 is resuspended. Etc. can be further reduced.

DESCRIPTION OF SYMBOLS 10 Underground unit, 12 Outer unit, 15 Material supply apparatus, 16 Air supply apparatus, 18 Quick setting agent supply apparatus, 19 Oil pressure generator, 20 Drum, 22 Relay part, 24 Spraying part, 25 Material supply hose, 26 Air supply hose, 28 Quick setting agent supply hose, 29 Feeder, 30 Vibration generator, 31 Stirring motor, 32 Material sensor, 40 Stationary substrate, 42 Rotating body, 44 Hydraulic motor, 45 Material hole, 46 Air hole 48, quick setting agent hole, 55 material annular groove, 56 air annular groove, 58 quick setting agent annular groove, 65 second material hose, 66 air hose, 68 quick setting agent hose, 70 for driving Gear, 80 Hose for first material, 86 Filling part, 88 Nozzle part, 90 Movable plate, 90a Small adjustment hole, 90b Large adjustment hole, 92 Stationary plate, 92a Passing hole, 4 gear ring, 96 gear, 98 hydraulic motor, 100 shafts, 102 cranes.

Claims (4)

A concentric rotary sprayer for lining the earth retaining material on the inner wall of the shaft,
A drum held in the shaft and storing earth retaining material;
A spraying section that is rotatably held in a horizontal plane with respect to the drum below the drum, and is a filling space filled with the earth retaining material, and the filled earth retaining material is ejected to the outside. A spraying section comprising a nozzle,
A rotating mechanism for rotating the spraying part in a horizontal plane;
A first material hose for guiding the earth retaining material stored in the drum to the filling space;
A first fluid hose and a quick setting agent hose for guiding the compressed fluid and the quick setting agent into the filling space from the outside of the shaft,
A switching mechanism for switching the ejection amount of the earth retaining material ejected from the nozzle in response to the supply of the compressed fluid;
A concentric rotary sprayer characterized by comprising: The concentric rotary sprayer according to claim 1, further comprising:
A concentric rotary spraying machine characterized in that the earth retaining material supplied from the outside of the shaft is guided into the filling space, and includes a second material hose having a smaller diameter than the first material hose. The concentric rotary sprayer according to claim 1 or 2, further comprising:
First delivery means for delivering earth retaining material in the drum to the first material hose;
A second delivery means for feeding the earth retaining material outside the shaft to the second material hose;
By switching the drive of the first and second delivery means, it is possible to switch the supply source of the earth retaining material to the filling space,
A concentric rotary sprayer. A concentric rotary sprayer according to any one of claims 1 to 3,
The switching mechanism is
A stationary plate and a movable plate that are provided at the boundary between the nozzle and the filling space to partition the nozzle and the filling space, and are arranged adjacent to each other;
A moving mechanism for moving the movable plate relative to the stationary plate;
With
One or more passage holes are formed in one of the stationary plate and the movable plate,
The other of the stationary plate and the movable plate is a plurality of adjustment holes having different diameters, and only a part of the adjustment plate communicates with the passage hole as the movable plate moves, and the other is the rest of the stationary plate and the movable plate. A plurality of adjustment holes that are closed by one side are formed,
A concentric rotary sprayer.

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