JP2006188860A - Tunnel lining device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tunnel lining device suitable as a general-purpose machine for a small bore tunnel, reduced in manufacturing cost through miniaturization and weight reduction, and capable of preparing a spray lining material in conformity to properties of an accelerating agent (b) and various operating environments by setting the added position of the accelerating agent as requested. <P>SOLUTION: The rotary projection type tunnel lining device 1 leads a lining material (a) and the accelerating agent (b) into an agitating-mixing part 1B from a material lead-in part 1A, adds the accelerating agent (b) into the lining material (a) and kneads them in an agitating-mixing chamber 4 to form the spray lining material (c) which is sequentially transferred to a rotary projection part 1C and projected and sprayed by centrifugal force to an excavated wall surface 18 of the tunnel from an impeller 13 provided at the rotary projection part 1C. A cylindrical base cylinder 5 forming the agitating-mixing chamber 4 is fixed into a stationary state, and an agitating rotary shaft 6 provided with agitating rods 8 projecting radially, and mounted to an axis in the agitating-mixing chamber 4 is rotated at the same speed as the impeller 13. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a tunnel lining apparatus for lining a tunnel excavation wall surface with a cement-based lining material such as concrete, and in particular, a lining material and a rapid setting agent are introduced from a material introduction portion into a stirring and mixing portion, and the lining material is rapidly introduced. The present invention relates to a rotary projection type tunnel lining device in which a sprayed lining material kneaded with a binder is sequentially transferred to a rotary projection unit, and is projected and sprayed from an impeller provided on the rotary projection unit onto a tunnel excavation wall surface by centrifugal force. .

This type of rotary projection type tunnel lining device includes the invention of Patent Document 1 proposed by the present applicant and already patented, but in the invention of Patent Document 1, the stirring and mixing unit is arranged substantially horizontally. A stirring and mixing chamber is formed by a truncated cone (conical shape), and a rotating shaft disposed along the center line of the truncated cone in the stirring and mixing chamber, and protrudes from the outer periphery of the rotating shaft to the vicinity of the inner periphery of the truncated cone. Provided with a plurality of stirring rods, the rotation drive unit rotates the frustum cylinder at a relatively low speed and the rotation shaft and the stirring bar at a relatively high speed in the same direction, and the small diameter end of the frustum cylinder through the material introduction unit The lining material introduced from the side and the quick setting agent are stirred and mixed.
Japanese Patent No. 3210899

  According to the tunnel lining apparatus of Patent Document 1, unlike local mixing and stirring such as a screw conveyor, it acts uniformly on the entire lining material and the quick setting agent, so that local stagnation occurs and solidifies. When the operation is stopped, the residual inertial force is left, or the supply of the lining material and the quick-setting agent is stopped immediately before the operation is stopped. The sprayed lining material is discharged to the rotary projection unit due to the horizontal component force generated by centrifugal force and the fluidity due to gravity along the tapered surface, and is projected to the outside from the rotary projection unit. Does not block the pipeline.

  In addition, the stirring and mixing unit is equipped with an impeller that causes the quick setting agent introduced at the front end of the rotating shaft to scatter to the inner peripheral surface of the truncated cone, and the rotating shaft and the impeller are rotated in an interlocked manner, thereby rapidly The binder is beaten against the inner surface of the frustoconical cylinder by the impeller in a uniformly dispersed state, so that the inner surface of the frustoconical cylinder is kneaded effectively with the lining material that flows in a spread state in a short time, and a small amount of quick setting agent is used. A high-strength spray lining material can be obtained, and the generation of dust is reduced. The structure in which the impeller is rotated in conjunction with each other can be easily controlled, and the structure of the rotary drive unit can be simplified and inexpensive.

  In the stirring and mixing unit, the lining material and the quick setting material to be used are configured by setting a desired relative rotation speed of the truncated cone, the rotating shaft and the stirring rod and controlling the kneading and residence time in the stirring and mixing chamber. It can be adapted to the properties, temperature, humidity or conditions of the drilling wall to be sprayed, and can be adjusted to obtain an optimally kneaded sprayed lining material. Play.

  However, in the case of the tunnel lining device according to the invention of Patent Document 1, since it has multiple functions, the structure is complicated and the size is increased, the weight is increased, and the manufacturing cost is increased. As a device for performing lining processing, there was room for improvement, and the inventors of the present invention examined, under the limited conditions even if a part of the function was omitted to reduce the size and weight. Since it has been confirmed that it can be used practically, it is newly proposed as a general-purpose machine for small-diameter tunnels with reduced manufacturing costs.

  That is, in the stirring and mixing unit in the invention of Patent Document 1, the relative rotational speeds of the truncated cone, the rotating shaft, and the stirring rod are set as desired, and the kneading and residence time in the stirring and mixing chamber is controlled. Adapt to the curing time of the quick-setting agent introduced from the small diameter side of the truncated cone forming the chamber, and slow the rotational speed of the truncated cone when the curing time is slow, and fast when the curing time is early By doing so, it was possible to adjust the arrival time until spraying on the excavation wall surface, but the truncated conical cylinder was made stationary and its rotational drive mechanism was omitted.

  As a factor that makes this possible, the first is the lining process of small-diameter tunnels, so that the projection distance is short and there is little influence due to the difference in the curing time of the quick setting agent, and the second is the recent rapid The binder has improved dramatically in terms of performance, reacts rapidly with the lining material and begins to cure in a short period of time, so it will cure well even if the frustoconical cylinder is stationary and the flow rate is delayed. The third is to allow the quick setting agent to be added to the lining material being transferred through the stirring and mixing chamber from a discharge port provided at a desired set position.

  The tunnel lining apparatus of the present invention introduces a lining material and a quick setting agent from a material introduction section into a stirring and mixing section, and rotates a sprayed lining material kneaded by adding the quick setting agent to the lining material in a stirring and mixing chamber. In a rotary projection type tunnel lining device, which is sequentially transferred to the projection unit and projected and blown by centrifugal force from the impeller provided on the rotary projection unit to the tunnel excavation wall surface, the cylindrical base cylinder forming the stirring and mixing chamber is fixed. In addition, the stirring rotating shaft mounted radially on the shaft center in the stirring and mixing chamber was rotated at the same speed as the impeller. (Claim 1)

  The agitation / mixing unit is provided with an accelerating agent addition means that can add an accelerating agent to a lining material being transferred through the agitation / mixing chamber from a discharge port provided at a desired setting position. The quick setting agent is supplied from the starting end side of the stirring rotation shaft, and discharge ports that can be opened and closed are provided at a plurality of locations in the middle of the stirring rotation shaft, and the necessary discharge ports can be selectively used. (Claim 2)

  The discharge port is drilled on the outer peripheral surface of a hollow stirring rotary shaft, the stirring rod is hollow, a short, hollow stirring rod is provided separately from the stirring rod, or the stirring rotation is hollow. It is possible to adopt a form in which a discharge port pipe is individually embedded in the shaft and a detachable sealing member is attached to an unnecessary discharge port. (Claim 3)

  According to the tunnel lining device of claim 1, the motor, pulley, V-belt, and the like that rotationally drive the frustoconical cylinder by rotating the frustoconical cylinder without making it rotate like the case of the invention of Patent Document 1 Since a known power transmission means and a rotary drive unit such as a rotary cylinder connected to the truncated cone can be omitted, the entire apparatus can be reduced in size and weight, and the manufacturing cost can be reduced. It can be used as a general-purpose machine suitable for lining processing of small diameter tunnels.

  According to the tunnel lining apparatus of claim 2, when the curing time of the quick setting agent is long, when the projection distance to be sprayed is short, when the lining material is in a slurry state with low viscosity, If it is low, set it on the material introduction part side that can form the discharge port, lengthen the kneading time, when the curing time of the quick setting agent is short, when the projection distance to spray is long, or the lining material In the case of a highly viscous slurry, or when the temperature is high as in summer, the kneading time can be shortened by setting the discharge port on the side of the rotatable projection unit.

  Therefore, it can be used to increase the work efficiency either when using a special quick-setting agent that is expensive but has a short curing time, or when using a general-purpose quick-setting agent that has a long setting time but is inexpensive. It is possible to cope with short projection distances such as small-diameter tunnels and short projection distances such as large-diameter tunnels. It is possible to perform uniform and good lining treatment, and the quick-setting agent adding means has a simple structure with a hollow rotating shaft for stirring and a discharge port that can be opened and closed in the middle. Can take various forms as in claim 3.

  The tunnel lining apparatus of the present invention will be described in detail with reference to the accompanying drawings showing a preferred embodiment to which the present invention is applied. FIG. 1 is a cross-sectional view of a part of the lining apparatus according to the first embodiment. 2 shows an enlarged sectional view of the stirring and mixing unit in FIG. 1, FIG. 3 shows an operation explanatory view of the rotary projection unit in FIG. 1, and FIG. 4 shows stirring of the lining apparatus according to the first embodiment. The expanded sectional view of the stirring mixing part by the 2nd Example which changed the mixing part is shown.

  The tunnel lining device 1 includes a material introducing portion 1A for supplying a slurry-like lining material a and a powdery or liquid quick-setting agent b, and stirring for adding the quick-setting agent b to the lining material a and kneading. A mixing unit 1B, a rotation projecting unit 1C that rotates and projects the kneaded sprayed lining material c on the excavation wall surface of the tunnel, and a rotation drive unit 1D that rotationally drives each related unit are provided.

  A lining material a prepared in a slurry state is pumped to the material introduction unit 1A through the introduction pipe 2 and a liquid or powder quick-setting agent b is pumped through the introduction pipe 3 to the lining. The material a and the quick setting agent b are respectively supplied into the truncated cone cylinder 5 arranged in a substantially horizontal state that forms the mixing and stirring chamber 4 of the stirring and mixing unit 1B.

  In the stirring and mixing unit 1B, the lining material a fed into the mixing and stirring chamber 4 is transferred along the inner peripheral surface of the truncated cone tube 5 to the rotary projection unit 1C side, and the rapid setting agent b is transferred to the truncated cone tube 5. The lining material a and the rapid setting agent b are stirred and mixed by the stirring rod 8 that is radially scattered toward the inner peripheral surface of the steel plate and radially attached to the solid or hollow rotating shaft 6 for stirring. The sprayed lining material c is sequentially transferred to the rotary projection unit 1C.

  The agitation rotating shaft 6 is provided with an impeller 7 for rapid setting agent scattering having a plurality of (for example, four) blades 7a projecting radially at the end on the inlet side, and faces the outlet of the introduction pipe 3 The end portion on the outlet side is connected to the rotary projection unit 1C side through the closing plate 9, and the quick setting agent b discharged from the introduction pipe 3 is impeller 7 rotated by the rotating shaft 6 for stirring. Thus, it is scattered radially toward the inner peripheral surface of the truncated cone tube 5 and added to the lining material a.

  The rotary projection unit 1C is arranged radially at predetermined intervals along the circumferential direction between the disc-shaped side plate 10 facing the opening of the truncated cone cylinder 5 and the annular face plate 11 arranged inside thereof. An impeller 13 connected by a plurality of blades 12, an endless flat belt 14 wound around the outer peripheral surface of the impeller 13 in a state where the projection direction F is released, and an endless arrangement disposed around the outer periphery of the impeller 13 It comprises a plurality of guide pulleys 15 for guiding the flat belt 14 and a mounting plate 16 on which the guide pulleys 15 are pivotally attached.

  In the rotary projection unit 1C, the blowing lining material c fed from the stirring and mixing unit 1B is accommodated in the impeller 13 which is surrounded by the endless flat belt 14 and rotates at a high speed, and the blowing lining material c is impeller 13. While being pushed out in the circumferential direction by the blade 12, the projecting port 17 provided in the release part of the endless flat belt 14 is rotated and projected onto the excavation wall surface 18 using centrifugal force, and the lining 19 is sprayed on the excavation wall surface 18. .

  The rotation drive unit 1D includes a first rotation drive unit that rotates the rotation shaft 6 for stirring, the stirring rod 8, and the impellers 7 and 13, and a second rotation that rotates the mounting plate 16 to control the projection direction. And a second rotation driving unit that transmits the rotational force of the motor 20 to the mounting plate 18 by a pulley, a V belt, and other known power transmission means 21, and is rotatable with respect to the outer rotating cylinder 22. 18 is a rocking rotation ability.

  The first rotational drive unit transmits the rotational force of the motor 23 to the inner rotary cylinder 25 by a pulley, a V belt, and other known power transmission means 24, and enables the impeller 13 connected to the inner rotary cylinder 25 to rotate. The side plate 10 of the impeller 13 is detachably connected to the closing plate 9 provided on the stirring rotary shaft 6 in a superposed state, and is rotated in conjunction with the stirring rotary shaft 6, the stirring rod 8, and the impellers 7 and 13. Is possible

  The tunnel lining device 1 having the above-described configuration is mounted on a self-propelled base machine equipped with an extendable boom and an arm via an attachment mechanism (not shown) as in the invention of Patent Document 1, The rotary projection unit 1C is positioned at the lining start position with a predetermined distance from the excavation wall surface 18 by operating the roof and the arm, and while the telescopic boom is swung in the circumferential direction from the side of the tunnel toward the apex, A lining 19 is sprayed by rotating and projecting the lining material c.

  In this tunnel lining device 1, as in the case of the invention of Patent Document 1, the rapid setting agent b is added to the lining material a supplied from the material introduction unit 1 </ b> A to the stirring and mixing unit 1 </ b> B, and is mixed and kneaded. The spray lining material c is sequentially transferred to the rotary projection unit 1C, and is rotationally projected from the impeller 13 of the rotary projection unit 1C to the excavation wall surface of the tunnel for spraying.

  In particular, a motor, a pulley, a V belt, and other known power transmission means for rotating the truncated cone by rotating the truncated cone as in the case of the invention of Patent Document 1 without rotating, and a truncated cone. Since the rotation drive unit such as a rotating cylinder connected to the cylinder can be omitted, the entire apparatus can be reduced in size and weight, and the general purpose suitable for the lining process of the small diameter tunnel by reducing the manufacturing cost. Can be used as a machine.

  Next, FIG. 4 is a second embodiment in which the means for adding the quick setting agent b is changed with respect to the stirring and mixing unit 1B of the tunnel lining device 1 according to the first embodiment, except for the stirring and mixing unit 1B. Since the configuration is the same as that of the first embodiment, common portions are denoted by the same reference numerals, detailed description thereof is omitted, and different portions are mainly described.

  The lining material a is directly supplied into the truncated cone cylinder 5 forming the mixing and stirring chamber 4 through the introduction pipe 2 of the material introduction section 1A, but the rapid setting agent b passes through the introduction pipe 3 of the material introduction section 1A. To the quick-setting agent adding section 26 provided on the stirring rotary shaft 6 in the mixing and stirring chamber 4, radiating radially toward the inner peripheral surface of the truncated cone tube 5, and projecting from the stirring rotary shaft 6. The lining material a and the rapid setting agent b are stirred and mixed by the stirrer 8 thus prepared, and the sprayed lining material c kneaded is sequentially transferred to the rotary projection unit 1C.

  The quick setting agent adding section 26 is sealed with a clogging plate 9 having a hollow rotating stirring shaft 6 and removable at the distal end side, and the quick setting agent b is pumped by connecting the introduction pipe 3 to the proximal end side. The discharge ports 27 for the quick setting agent b are provided at a plurality of locations along the circumferential direction at predetermined intervals along the axial direction of the agitation rotating shaft 6, and can be attached to and detached from the unused discharge ports 27. A sealing member 28 such as a screw plug is attached and closed so that the discharge port 27 to be used can be selected.

  In this tunnel lining device 1, a quick-setting agent adding unit 7 is provided as a quick-setting agent adding means that can set the addition position of the quick-setting agent b in the stirring and mixing chamber 4 as desired. A wide range of quick setting agents can be used, the preparation of the spray lining material c can be made easily and of good quality, and work efficiency can be improved and high quality lining treatment can be achieved. It is.

  That is, by selecting arbitrarily a plurality of discharge ports 27 provided in the quick setting agent adding section 26, setting the addition position of the quick setting agent b as desired, and adding the quick setting agent b, It can be adapted to differences in the curing time due to the binder, the length of the spray distance to be sprayed, the properties of the lining material a, the temperature difference depending on the season, and other usage environments.

  For example, when the curing time of the quick setting agent is long, when the spraying distance to be sprayed is short, when the lining material a is in a slurry state with low viscosity, or when the temperature is low as in winter, the discharge port 10 Set the material introduction part 1A side to be long and increase the kneading time, when the curing time of the quick setting agent is short, when the spraying distance to spray is long, or when the lining material a is a highly viscous slurry If the temperature is high, such as in the summer, the time for kneading by setting the discharge port 10 on the side of the rotary projection unit 1C can be shortened.

  Therefore, it can be used to increase the work efficiency either when using a special quick-setting agent that is expensive but has a short curing time, or when using a general-purpose quick-setting agent that has a long setting time but is inexpensive. It can be used even when the projection distance is short, such as a small-diameter tunnel, and it is possible to cope with the difference between manufacturers of the lining material a and the quick setting agent b. Processing can be performed.

  In addition, in the quick-setting agent adding part 26 according to the illustrated embodiment, the discharge port 27 is formed in the outer peripheral surface of the hollow rotating shaft 6 for stirring, but the stirring rod 8 is made hollow to form the quick-setting agent b. It is used as a discharge port, or a short and hollow stirrer bar is provided separately from the stirrer bar 8 to discharge the quick setting agent b, or a discharge port pipe is individually embedded in the hollow stirring rotary shaft 6 Various modifications that function in the same manner within the scope of the gist can be adopted.

It is the whole side view which made a section of a lining device to which the present invention was applied a section. It is an expanded sectional view of the stirring mixing part in the lining apparatus of FIG. It is operation | movement explanatory drawing of the rotation projection part in the lining apparatus of FIG. It is an expanded sectional view of the stirring mixing part by the other Example in the lining apparatus of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Tunnel lining apparatus 1A Material introduction part 1B Stirring mixing part 1C Rotation projection part 1D Rotation drive part 2 Introduction pipe (of lining material a) 3 Introduction pipe (of quick setting agent b) 4 Stirring mixing chamber 5 Conical cylinder 6 Stirring Rotating shaft 7 Impeller 8 (for quick setting agent scattering) 9 Stirring rod 9 Closing plate 10 Side plate 11 Annular face plate 12 Blade plate 13 Impeller 14 (for spraying lining material projection) Endless flat belt 15 Guide pulley 16 Mounting plate 17 Projection port 18 Excavation Wall 19 Lining 20, 23 Motor 21, 24 Power Transmission Means 22 Outer Rotating Tube 25 Inner Rotating Tube 26 Quick Setting Agent Adding Portion 27 Discharge Port 28 Screw Plug (Sealing Member)

Claims (3)

  The lining material and rapid setting agent are introduced from the material introduction unit into the stirring and mixing unit, and the sprayed lining material, which is kneaded by adding the rapid setting agent to the lining material in the stirring and mixing chamber, is sequentially transferred to the rotary projection unit and rotated and projected. In a rotary projection type tunnel lining device that projects and blows by centrifugal force to the tunnel excavation wall surface from the impeller provided in the section, the cylindrical base cylinder forming the stirring and mixing chamber is fixed and brought into a stationary state, and radially A tunnel lining device characterized in that a stirring rotating shaft provided at a shaft center in a stirring and mixing chamber is rotated at the same speed as the impeller by protruding a stirring rod.   The agitation / mixing unit is provided with an accelerating agent addition means that can add an accelerating agent to a lining material being transferred through the agitation / mixing chamber from a discharge port provided at a desired setting position. 2. The tunnel according to claim 1, wherein a quick setting agent is supplied from the start end side of the agitating rotation shaft, and discharge ports that can be opened and closed at a plurality of locations are provided in the middle of the stirring rotation shaft, and the necessary discharge ports are selectively used. Lining equipment. The discharge port is drilled on the outer peripheral surface of a hollow stirring rotary shaft, the stirring rod is hollow, a short, hollow stirring rod is provided separately from the stirring rod, or the stirring rotation is hollow. The tunnel lining device according to claim 2, wherein piping for discharge ports is individually embedded in the shaft, and a detachable sealing member is attached to unnecessary discharge ports.

Images