JP6967241B2 - Sprinkler for tunnel construction - Google Patents

Description

The present invention relates to a watering device for tunnel construction, which has two functions of removing suspended dust in a tunnel mine and moist curing of lining concrete with one device.

Since a large amount of dust is generated during tunnel construction, it is necessary to ensure the health and safety of workers from such dust and prevent the social environment from deteriorating due to the diffusion of dust from the wellhead. ..

As shown in FIG. 1, in tunnel construction, dust generated in a tunnel mine is roughly classified into the following three types.
(1) Dust from excavation such as blasting, dust from sprayed concrete construction
(2) Excavation dust during invert excavation
(3) Dust sprinkled when the vehicle is running Here, most of the dust in (1) above can be removed by a dust collector installed as standard near the face. On the other hand, the dust in (2) and (3) above is difficult to remove because it is mainly generated in the middle section of the mine. Was there.

As the technique of underground watering, as shown in Patent Document 1 below, water particles are generated by a charged water particle generating means attached to and supported by a support structure configured to be movable by itself, and the water is generated. A charged water curtain has been developed by charging particles by an induced charging method to generate charged water particles while ejecting them and dropping them from above.

Further, as the dust collecting device, for example, as shown in Patent Document 2 below, in a cleaning device for tunnel dust, exhaust gas, etc. that removes dust by using water sprinkling and a filter in combination, a substantially upright casing body is used. An air inlet is formed in the upper part of one end surface, an air outlet is formed in the upper part of the opposite end surface, and a partition wall having a lower portion as a flow path is provided inside the casing body. By forming a relatively large first space on the air inlet side and a relatively small second space on the air outlet side, the air flowing in from the air inlet descends the first space. A flow path is formed that passes through the lower end side flow path of the partition wall, rises in the second space, and reaches the air discharge port, and is spaced 1 or vertically in the middle portion of the first space. Along with arranging multiple stages of filters, a sprinkler facility that injects downwards is arranged above at least one filter surface, and the bottom surface of the first space is dust sludge collected from the air. The one that is the retention part of the air can be mentioned.

On the other hand, tunnel lining concrete is a structure that requires high durability because it is necessary to safely maintain spaces such as roads, railroads, and waterways for a long period of time, but it is difficult to repair after operation. In order to ensure durability, the tunnel shape has a large exposed concrete area and moisture is easily dissipated, so that wet curing after deframement of the centle is particularly important.

As such a wet curing technique, for example, in Patent Document 3 below, in a tunnel lining concrete curing device for curing by spraying water on the placed tunnel lining concrete, the tunnel lining concrete is atomized. It has a spraying mechanism for spraying water and a moving mechanism for movably providing the spraying mechanism in the tunnel, and the spraying mechanism and the moving mechanism spray a predetermined amount of the mist-like water on the surface of the tunnel lining concrete. It is disclosed that it is configured to be able to move in the tunnel while being attached.

Japanese Unexamined Patent Publication No. 2016-153121 Japanese Unexamined Patent Publication No. 2008-231749 Japanese Unexamined Patent Publication No. 2006-89995

However, when the dust collector described in Patent Document 2 is installed as a measure against dust in the mine, it is difficult to install or replace it due to the nature of tunnel construction in which the place where dust is generated moves as the construction progresses. The burden of such labor and cost is large, and a more efficient and effective method for dust countermeasures has been sought.

Further, when a sprinkler for removing dust in the mine as described in Patent Document 1 and a sprinkler for wet curing of lining concrete as described in Patent Document 3 are separately provided. In addition to the high cost, the number of equipment to be placed in the mine increased, which could cause other problems such as obstructing the passage of vehicles.

Therefore, a main object of the present invention is to provide a watering device for tunnel construction, which enables simultaneous removal of dust in a mine and wet curing of lining concrete with one device.

In order to solve the above problems, as the present invention according to claim 1, a mobile pedestal that can move in the tunnel axial direction and the moving pedestal are supported and separated from the surface of the lining concrete to the inside of the tunnel. Equipped with a watering facility that sprinkles water at the position,
The watering facility includes a water supply pipe arranged along the tunnel circumferential direction at a position separated from the surface of the lining concrete inside the tunnel, and a plurality of watering nozzles arranged along the water supply pipe at predetermined intervals. A charging electrode for generating charged water charged with water sprinkled toward the inside of the tunnel is arranged inside the tunnel of the watering nozzle.
The watering nozzle has a function of sprinkling water supplied through a water supply pipe toward the surface of the lining concrete and at the same time sprinkling the charged water charged by the charging electrode toward the inside of the tunnel. ,
A watering device for tunnel construction is provided, which is characterized in that watering toward the surface of the lining concrete enables moist curing of the lining concrete and watering toward the inside of the tunnel enables dust removal in the mine. NS.

In the invention according to claim 1, as a watering device for tunnel construction, a mobile pedestal that can move in the tunnel axial direction and the mobile pedestal are supported and separated from the surface of the lining concrete to the inside of the tunnel. It is equipped with a sprinkler facility that sprinkles water at the location. The watering equipment includes a water supply pipe arranged along the tunnel circumferential direction at a position separated from the surface of the lining concrete inside the tunnel, and a plurality of watering nozzles arranged along the water supply pipe at predetermined intervals. And inside the tunnel of the watering nozzle, a charging electrode for generating charged water charged with water sprinkled toward the inside of the tunnel is arranged.
The watering nozzle has a function of sprinkling water supplied through the water supply pipe toward the surface of the lining concrete and at the same time sprinkling the charged water charged by the charging electrode toward the inside of the tunnel. , Watering toward the surface of the lining concrete enables wet curing of the lining concrete, and watering toward the inside of the tunnel enables dust removal in the mine. In this way, with this device, it is possible to remove dust in the mine such as excavated dust during invert excavation and dust scattered during vehicle running, and to wet-cure the lining concrete at the same time. For this reason, the effect of removing dust in the mine can improve the working environment in the mine, the social environment can be improved by preventing the diffusion of dust outside the mine, and the effect of moist curing of the lining concrete makes it possible to improve the lining concrete. You will be able to improve the quality of concrete.

Further, since the water sprinkled toward the inside of the tunnel is the charged water charged by the charging electrode, the charged water and the dust can be separated by sprinkling the charged water charged with the opposite charge to the dust. An electrostatic force acts between them, and the dust and the charged water are integrated to increase the falling speed of the dust, and the concentration of the dust floating in the mine can be efficiently reduced.

Further, since the mobile pedestal is provided so as to be movable in the tunnel axial direction, the length of the watering device in the tunnel axial direction can be made shorter than the length of the section where water is sprinkled, and the device can be made compact. be able to.

According to the second aspect of the present invention, there is provided the tunnel construction watering device according to claim 1, wherein the watering nozzle is a rotary nozzle capable of watering the surface of the lining concrete and the inside of the tunnel.

In the invention described in claim 2, wherein, as said sprinkler nozzles, since the rotary nozzle capable watering towards the surface and the tunnel inner lining concrete, by sprinkling from the rotary nozzle, lining concrete Continuous watering will be possible in both directions on the surface of the concrete and inside the tunnel.

According to the third aspect of the present invention, the mobile pedestal is a watering device for tunnel construction according to any one of claims 1 and 2, which automatically reciprocates on two rails arranged along the tunnel axial direction. Is provided.

In the invention according to claim 3, since the moving pedestal automatically reciprocates on two rails arranged along the tunnel axial direction, wet curing of the lining concrete can be easily performed over a medium to long term. It can be carried out in the above, and it can contribute to the improvement of the quality of the lining concrete, and it becomes possible to surely remove the dust in the tunnel over a wide range.

According to the present invention according to claim 4, the mobile pedestal is provided with a space portion through which a tunnel construction machine can pass in the center of the tunnel, and penetrates the portion corresponding to the tunnel shoulder portion in the tunnel circumferential direction in the tunnel axial direction. The tunnel construction sprinkler according to any one of claims 1 to 3 is provided with a notch through which a ventilation air pipe of the tunnel can pass.

In the invention according to claim 4, since the mobile pedestal is provided with a space portion in the center of the tunnel through which the tunnel construction machine can pass, the space portion in the center is provided in the state where the apparatus is arranged in the tunnel pit. Vehicles can pass through the tunnel, which does not significantly affect the progress of tunnel construction. Further, since the moving pedestal is provided with a notch portion corresponding to the tunnel shoulder portion in the tunnel circumferential direction through the tunnel axial direction and through which the ventilation air pipe of the tunnel can pass, the ventilation air pipe is provided. It will be possible to wet-cure the lining concrete and remove dust in the tunnel without being hindered by the tunnel.

According to the fifth aspect of the present invention, the sprinkler facility is provided at both ends of the mobile pedestal in the moving direction or at either end thereof, and is not provided at the intermediate portion according to any one of claims 1 to 4. The described tunnel construction sprinkler is provided.

In the invention according to claim 5, the watering equipment is provided at the front end and / or the rear end of the moving pedestal in the moving direction as the mounting position of the watering equipment for the moving pedestal, and the watering equipment is provided at the intermediate portion. I try not to. As a result, watering from the watering equipment can be reliably performed toward the surface of the lining concrete and the space inside the tunnel without being affected by the moving pedestal.

The present invention according to claim 6 is provided with a determination means for switching the operating state of the sprinkler according to the measurement result of the dust meter for measuring the amount of dust in the tunnel installed in the tunnel. The sprinkler for tunnel construction described in any one is provided.

In the invention according to claim 6, according to the measurement result of the dust meter installed in the tunnel, if the amount of dust exceeds a predetermined threshold value, the sprinkler is operated, and if it is equal to or less than a predetermined threshold value, a predetermined condition is satisfied. I have decided to stop the operation under.

The present invention according to claim 7 is provided with a determination means for switching the energized state of the charging electrode according to the measurement result of the dust charge measuring device for measuring the charged state of the dust in the tunnel installed in the tunnel. The sprinkler for tunnel construction according to any one of claims 1 to 6 is provided.

In the invention according to claim 7, the dust removal efficiency is improved by sprinkling charged water charged with a charge opposite to that of the dust according to the measurement result of the charge measuring device installed in the tunnel. There is.

The present invention according to claim 8 is provided with a determination means for switching the operating state of the sprinkler according to the measurement result of a hygrometer for measuring the humidity of the lining concrete installed on the lining concrete. A watering device for tunnel construction according to any one of 7 to 7 is provided.

In the invention according to claim 8, the operation or stop of the sprinkler is determined under predetermined conditions according to the measurement result of the hygrometer installed on the lining concrete.

As described in detail above, according to the present invention, one device can simultaneously remove dust in the mine and wet-cure the lining concrete, which can contribute to the improvement of the working environment in the mine and the quality of the lining concrete. become.

It is sectional drawing of the inside of the tunnel using the sprinkler 1 which concerns on this invention. It is a vertical sectional view of the sprinkler 1. It is a cross-sectional view of the sprinkler 1. It is an enlarged view which shows the drive wheel of a watering device 1. It is an enlarged view which shows the limit switch of a watering device 1. It is a perspective view of the sprinkler equipment 11. It is sectional drawing of the sprinkler equipment 11. It is a block diagram which shows the operation control method of a sprinkler device 1.

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

As shown in Fig. 1, in the construction of a mountain tunnel, after digging due to blasting, etc., sprayed concrete is constructed by spraying on the inner wall surface of the excavated tunnel, rock bolts are driven in, and then an excavator such as a hydraulic excavator is used. Invert excavation at the bottom of the tunnel was carried out, and a waterproof sheet was stretched along the inner peripheral surface of the sprayed concrete using the seat trolley 2 (this surface becomes the ground side wall surface), and the lining centre. While sequentially moving 3 (movable steel mold) in the direction of the tunnel axis, the lining center of the lining center along the circumferential direction with a distance from the ground side wall surface for each span in the direction of the tunnel axis. A process of installing a mold, placing concrete for lining in the space between the side wall surface of the ground and the mold, and removing the frame after a predetermined curing period has elapsed is performed. In addition, vehicles such as dump trucks and concrete mixer trucks are running in the mine for unloading and transporting concrete.

The sprinkler 1 according to the present invention is arranged behind the lining center 3 and sprinkles water into the mine for a predetermined period after deframement for wet curing of the lining concrete 4 and removal of floating dust in the mine. There is.

As shown in FIGS. 2 and 3, the sprinkler 1 is supported by a mobile pedestal 10 that can move in the tunnel axial direction in the tunnel axial direction, the mobile pedestal 10, and a tunnel from the surface of the lining concrete 4. It is equipped with a sprinkler facility 11 that sprinkles water at a position separated from the inside.

As shown in FIG. 3, the mobile pedestal 10 is supported on the outside of a gate-shaped frame 12 made of a substantially gate-shaped steel frame material and the like, and is predetermined from the surface of the lining concrete 4. It is composed of an arch-shaped frame 13 made of a steel frame or the like formed in a substantially arch shape along the circumferential direction of the tunnel at a position separated by a distance.

The mobile pedestal 10 is automatically reciprocated by wheels and a drive device on two traveling rails 14 and 14 arranged along the tunnel axial direction.

The traveling rail 14 supports the gantry frame 12 of the moving pedestal 10 so as to be able to travel, and two rails are laid along the longitudinal direction on the lower surface of the tunnel. As shown in detail in FIG. 4, the traveling rail 14 is made of a rail body 14a on which the wheels 15 provided on the portal frame 12 travel and a channel steel in which the rail body 14a is supported in the groove. It is preferably composed of the pillow material 14b. As a result, both side surfaces of the pillow material 14b are provided on both sides of the rail main body 14 in an upright state.

At the lower end of the gantry frame 12, at least four wheels 15, 15 ... Rolling on the traveling rail 14 are provided, and at least one of the wheels 15 is rotationally driven by a geared motor 16 or the like to drive the gantry. The frame 12 is configured to automatically reciprocate on the traveling rails 14, 14.

Since the sprinkler 1 is provided so as to be movable on the traveling rail 14 in this way, the length of the sprinkler in the tunnel axial direction is set to the total length of the casting span of the lining concrete as in the conventional sprinkler. It is not necessary to form it over a long length, and it can be formed with a length shorter than one span in which the lining concrete is placed, and the sprinkler can be made compact.

The moving speed of the sprinkler 1 can be arbitrarily set, but it is preferably about 1 to 20 m / min, particularly about 3 to 8 m / min.

Since the sprinkler 1 automatically reciprocates on the traveling rail 14, the moving pedestal 10 can swing in the moving direction at the front and rear ends in the moving direction, as shown in FIG. A limit switch 17 including a free end portion 17a and a switch 17b that oscillates a signal for rotating the wheel 15 in the reverse direction due to the swing of the free end portion 17a is provided, and the front and rear of a predetermined section of the traveling rail 14 are provided. A limit switch contact portion 18 with which the free end portion 17a of the limit switch 17 abuts is provided at each end portion. As a result, the sprinkler 1 can automatically reciprocate within a predetermined section provided with the limit switch contact portions 18 and 18.

The limit switch contact portion 18 can be provided at the front and rear end portions of an arbitrary predetermined section in which the sprinkler device 1 is to be reciprocated. The moving section can be arbitrarily set, but it is preferably about 3 to 12 spans (about 30 to 130 m) in which lining concrete is placed. The fixing of the limit switch contact portion 18 to the traveling rail 14 is supported on the upright side surface of the pillow material 14b by two bolts 18a and 18a separated along the longitudinal direction of the rail, as shown in FIG. It is done by.

Further, as an emergency measure when the moving pedestal 10 is not moved in the opposite direction by the limit switch 17, an emergency stop device protruding forward in the moving direction at both ends of the moving pedestal 10 in the moving direction. It is preferable to provide the emergency stop device contact portion 20 (see FIG. 2) with which the emergency stop device 19 abuts, respectively, outside the limit switch contact portion 18 of the traveling rail 14. As a result, even if the limit switch 17 gets over the limit switch contact portion 18 and moves to the outside, the emergency stop device 19 comes into contact with the emergency stop device contact portion 20 and the moving frame 10 is provided. The movement can be stopped completely.

Further, by providing a sensing device (not shown) capable of sensing an object or a person in front of and behind the sprinkler 1, the sprinkler 1 may be provided with a function of automatically stopping the sprinkler 1.

As shown in FIG. 2, the mobile pedestal 10 is connected to a power cable 21 such as the geared motor 16 and a watering pump 34 for watering, which will be described in detail later. It is preferable that the power cable 21 is wound around an automatic reel 22 that automatically stretches and winds in conjunction with the movement of the mobile pedestal 10. As a result, the power cable 21 is wired without slack, and it is possible to prevent the power cable 21 from being entangled and stopping the movement of the moving pedestal 10 or the power cable 21 from being disconnected.

The gate-shaped frame 12 of the moving platform 10 is provided with a space in the center of the tunnel through which tunnel construction machines such as a dump truck, a concrete mixer truck, and a shovel car can pass.

As shown in FIG. 3, the arch-shaped frame 13 of the mobile pedestal 10 penetrates the portion corresponding to the tunnel shoulder in the tunnel circumferential direction in the tunnel axial direction, and the ventilation air pipe 5 of the tunnel can pass through. It is preferable that the notch 23 is provided. In particular, as shown in FIG. 3, the ventilation air pipe 5 of the tunnel is arranged inside the arched frame 13, and the notch 23 has a width that allows the suspension bolt for suspending the ventilation air pipe 5 to pass through. It is desirable to be formed. As a result, the width of the notch 23 can be reduced, and watering by the watering equipment 11 can be performed without a gap.

Inside the arch-shaped frame 13, a curing sheet 24 that also serves as waterproof is arranged. The curing sheet 24 is arranged on almost the entire surface of the main body portion of the arch-shaped frame 13 that does not reach the sprinkler equipment 11 that is provided so as to project from the arch-shaped frame 13. By providing the curing sheet 24, the sprayed mist is covered with the curing sheet 24 immediately after watering from the watering equipment 11 provided on the front side in the moving direction, so that water is sprinkled particularly toward the inside of the tunnel. The mist is less likely to diffuse and is more likely to be integrated with dust. In order to ensure that the effect of being covered with the curing sheet 24 immediately after such watering functions, the watering equipment 11 is provided on the front side in the traveling direction among the watering equipment 11 provided on the front side and the rear side of the watering device 1 in the traveling direction. Water may be sprinkled only from the sprinkler 11 provided, and may not be sprinkled from the sprinkler 11 provided on the rear side. The curing sheet 24 may be provided discontinuously in the notch 23 of the arched frame 13, or may be provided continuously by bypassing the ventilation air duct 5.

Next, the sprinkler facility 11 will be described. A plurality of the watering equipment 11 are arranged at a position separated from the surface of the lining concrete 4 inside the tunnel, a water supply pipe 30 arranged along the tunnel circumferential direction, and a plurality of water supply pipes 30 at predetermined intervals along the water supply pipe 30. In addition, it has a watering nozzle 31 that sprinkles water toward the surface of the lining concrete 4 and the inside of the tunnel. The sprinkler equipment 11 is provided at both ends of the mobile pedestal 10 in the moving direction or at either end.

As shown in FIGS. 2 and 3, the water supply pipe 30 is provided at both ends of the arch-shaped frame 13 in the traveling direction of the sprinkler, or at either end thereof, along with the arch-shaped frame 13. It is arranged at a position protruding outward from the arch-shaped frame 13 in the traveling direction of the sprinkler 1. The water supply pipe 30 may be provided discontinuously in the notch 23 of the arched frame 13, or may be provided continuously by bypassing the ventilation air pipe 5.

A plurality of watering nozzles 31, 31 ... Are provided at predetermined positions with respect to the water supply pipe 30. As shown in FIG. 6, the watering nozzle 31 is provided in connection with the water supply pipe 30, and ejects water supplied from the tip of the nozzle through the water supply pipe 30 in a mist shape. be. The watering by the watering equipment 11 is performed on each of the front side and the rear side in the traveling direction of the watering device 1, or is performed on either side.

The watering nozzle 31 is provided so as to project from the water supply pipe 30 in a direction (tunnel axis direction) that is on the end side of the water sprinkler 1 in the traveling direction and is substantially orthogonal to the axial direction of the water supply pipe 30. , A plurality of them are arranged along the water supply pipe 30 at predetermined intervals.

The watering nozzle 31 sprinkles water supplied through the water supply pipe 30 toward the surface of the lining concrete 4, and charges the charged water by the charging electrode 32 (see FIG. 7) inside the tunnel. It also has a function to sprinkle water toward it. Watering toward the surface of the lining concrete 4 enables wet curing of the lining concrete 4, and watering toward the inside of the tunnel enables dust removal in the mine.

As described above, in the present sprinkler 1, one device can simultaneously remove dust in the mine and wet-cure the lining concrete 4. Therefore, the effect of removing dust in the mine can improve the working environment in the mine, and the social environment can be improved by preventing the diffusion of dust to the outside of the mine. The quality of the lining concrete 4 can be improved.

The arrangement interval of the watering nozzles 31 is preferably 10 to 100 cm, particularly 30 to 70 cm along the water supply pipe 30. When the watering equipment 11 is provided on the front side and the rear side of the watering device 1, the watering nozzles 31 provided on the front side and the rear side may be arranged at the same positions on the front side and the rear side of the watering device 1, but the pitch is half pitch. It is preferable that the lining concrete 4 is arranged so as to be staggered so that the surface of the lining concrete 4 and the inside of the tunnel can be evenly watered.

The watering nozzle 31 may be a fixed type in which water is sprinkled from two nozzles arranged toward the surface side of the lining concrete 4 and the inside of the tunnel, respectively, but as shown in FIG. 6, the lining concrete 4 It is preferable to use a rotary nozzle capable of watering the surface and the inside of the tunnel. By using the rotary nozzle, water can be continuously sprinkled from all angles in multiple directions, and water can be evenly sprinkled on the surface of the lining concrete 4 and in the tunnel pit.

The configuration of the watering nozzle 31 including the rotary nozzle will be described in detail. As shown in FIG. 6, the fixed side main body 31a connected to the water supply pipe 30 and the fixed side main body 31a are axially rotated. It is composed of a rotating side main body 31b rotatably attached, an arm 31c extending outward from the outer periphery of the rotating side main body 31b, and a nozzle 31d attached to the tip of the arm 31c to spray water. ing. The direction of the rotation axis of the rotary nozzle can be set arbitrarily. For example, as shown in FIGS. 6 and 7, the rotation may be made to rotate about an axis substantially along the tunnel axial direction, or, although not shown, in a direction substantially orthogonal to the tunnel axial direction (tunnel circumferential direction). It may be rotated around an axis along the axis.

In the rotary nozzle, it is preferable to incline the arm 31c from the middle in the direction opposite to the rotation direction at a predetermined angle so that the rotation side main body portion 31b can rotate by the injection reaction force from the nozzle 31d. The number of the arms 31c and the nozzles 31d may be one or more, but it is preferable to arrange two or more symmetrically in consideration of stability during rotation. Further, it is preferable to provide all the nozzles 31d so as to rotate in a certain direction.

The amount of jet water per nozzle 31d is preferably 0.01 to 1 liter / min, particularly 0.1 to 0.3 liter / min, and the jet angle is about 60 to 120 °. Is preferable.

As described above, it is preferable that the sprinkler equipment 11 is provided at both ends of the moving pedestal 10 in the moving direction or at either end thereof, and is not provided at the intermediate portion. As a result, watering from the watering equipment 11 can be performed over a wide area without being disturbed by the mobile pedestal 10, and water can be reliably sprinkled toward the surface of the lining concrete 4 and the space inside the tunnel. become.

As shown in FIG. 7, inside the tunnel of the watering nozzle 31, a charging electrode 32 for generating charged water charged with water sprinkled toward the inside of the tunnel is arranged. Dust generated in tunnel construction has a positive (plus) or negative (minus) charge depending on various conditions. Dust with a particle size of 10 μm or less is difficult to fall due to gravity, and has a problem of floating in the air for a long period of time. Therefore, by spraying charged water having a diameter of about 50 to 100 μm charged with a charge opposite to that of the dust, an electrostatic force acts between the charged water and the dust, and the dust and the charged water are integrated. By aggregating the suspended dust by electrostatic force and increasing the particle size, the falling speed can be increased and the concentration of the suspended dust in the mine can be efficiently reduced.

As the charging electrode 32, any shape can be used as long as the water ejected from the nozzle 31d can be charged, but a rod-shaped electrode arranged substantially in parallel with the water supply pipe 30 can be used. It is preferable to use. The charging electrode 32 is located near the ejection port of the nozzle 31d of the watering nozzle 31, specifically, at a position slightly separated from the tip of the nozzle 31d at a position where water is sprinkled toward the inside of the tunnel, and is slightly separated from the tip of the nozzle 31d. It is preferable to arrange the nozzles 31d on both sides in the rotation direction. By positively energizing the charging electrode 32, charged water charged with a negative charge can be generated, and by negatively energizing the charging electrode 32, the charged water charged with a positive charge can be generated. Can be generated. The charging electrode 32 is preferably fixed to the water supply pipe 30 or the mobile mount 10.

As the material of the charging electrode 32, generally used materials such as copper, copper alloy, and stainless steel can be widely used, but it is preferable to use stainless steel that does not easily rust. Further, as the shape of the charging electrode 32, it is preferable to use a rod-shaped one having a circular cross section, and it is preferable to use one having a diameter of 2 to 20 mm, particularly about 8 to 12 mm.

The charging electrode 32 may be provided discontinuously in the notch 23 of the arched frame 13, or may be provided continuously by bypassing the ventilation air duct 5.

As shown in FIGS. 2 and 3, the mobile pedestal 10 is provided with a tank 33 for storing water for watering and a water supply pump 34 for supplying the water of the tank 33 to the water supply pipe 30. The water stored in the tank 33 is pumped by the water supply pump 34 through the water supply pipe 30, and is sprinkled from each watering nozzle 31. The discharge pressure of the water supply pump 34 is preferably such that the nozzle 31d of the sprinkler equipment 11 can rotate due to the injection reaction force.

The sprinkler 1 is provided with a control panel 35 that controls the operation of the geared motor 16 and the water supply pump 34. The control panel 35 is further provided with determination means and the like, which will be described later, to control the operation of the sprinkler 1.

As shown in FIG. 8, the operation control of the sprinkler device 1 is set so that the operation state is switched according to the determination result by the determination means under predetermined conditions. It is preferable that this operation control is automatically performed by an analysis program (determining means) incorporated in the control panel 35.

As a procedure for operation control, as shown in FIG. 8, first, in the first determination means 40, according to the measurement result of a dust meter (not shown) for measuring the amount of dust in the tunnel installed in the tunnel. Then, the control for switching the operating state is performed.

When the measurement result of the amount of dust in the mine exceeds a predetermined threshold in the first determination means 40 and it is determined that the sprinkler 1 needs to be operated, the second determination means 41 is installed in the tunnel. The energized state of the charging electrode 32 is switched according to the measurement result of the dust charge measuring device (not shown) for measuring the charged state of the dust in the tunnel. For example, when it is measured by the charge measuring device that the dust in the mine is positively charged, the charging electrode 32 is placed on the positive side in order to generate charged water charged with a negative charge opposite to the dust. Energize. On the contrary, when the dust is negatively charged, the charging electrode 32 is energized to the negative side.

On the other hand, even if it is determined in the first determination means 40 that the amount of dust in the mine is equal to or less than a predetermined threshold value and the operation of the sprinkler device 1 is unnecessary, the third determination means 42 is installed in the tunnel. Depending on the measurement result of a hygrometer (not shown) that measures the humidity of the lining concrete 4, the sprinkler 1 may be operated. Specifically, when the humidity of the lining concrete 4 exceeds a predetermined threshold value in the third determination means 42, the sprinkler 1 is operated for wet curing of the lining concrete. On the other hand, when the humidity of the lining concrete 4 is equal to or less than a predetermined threshold value, the operation of the sprinkler 1 is stopped.

1 ... watering device, 2 ... seat trolley, 3 ... lining centre, 4 ... lining concrete, 10 ... mobile mount, 11 ... watering equipment, 12 ... gate type frame, 13 ... arch frame, 14 ... running rail, 15 ... Wheels, 16 ... Geared motor, 17 ... Limit switch, 18 ... Limit switch contact part, 19 ... Emergency stop device, 20 ... Emergency stop device contact part, 21 ... Power cable, 22 ... Automatic reel, 23 ... Notch Unit, 24 ... Curing sheet, 30 ... Watering pipe, 31 ... Watering nozzle, 32 ... Charging electrode, 33 ... Tank, 34 ... Water supply pump, 35 ... Control panel, 40 ... First determination means, 41 ... Second Judgment means, 42 ... Third judgment means

Claims (8)

It is equipped with a mobile pedestal that can move in the tunnel axis in the direction of the tunnel axis, and a sprinkler that is supported by the mobile pedestal and sprinkles water at a position separated from the surface of the lining concrete inside the tunnel.
The watering facility includes a water supply pipe arranged along the tunnel circumferential direction at a position separated from the surface of the lining concrete inside the tunnel, and a plurality of watering nozzles arranged along the water supply pipe at predetermined intervals. A charging electrode for generating charged water charged with water sprinkled toward the inside of the tunnel is arranged inside the tunnel of the watering nozzle.
The watering nozzle has a function of sprinkling water supplied through a water supply pipe toward the surface of the lining concrete and at the same time sprinkling the charged water charged by the charging electrode toward the inside of the tunnel. ,
A watering device for tunnel construction, which enables moist curing of lining concrete by sprinkling water toward the surface of lining concrete, and also enables dust removal in the mine by watering toward the inside of the tunnel. The watering nozzle for tunnel construction according to claim 1, wherein the watering nozzle is a rotary nozzle capable of watering the surface of the lining concrete and the inside of the tunnel. The watering device for tunnel construction according to any one of claims 1 and 2, wherein the moving platform automatically reciprocates on two rails arranged along the direction of the tunnel axis. The mobile pedestal is provided with a space in the center of the tunnel through which tunnel construction machines can pass, and also penetrates the portion corresponding to the tunnel shoulder in the circumferential direction of the tunnel in the direction of the tunnel axis to provide a ventilation air pipe for the tunnel. The watering device for tunnel construction according to any one of claims 1 to 3, which is provided with a passable notch. The watering device for tunnel construction according to any one of claims 1 to 4, wherein the watering equipment is provided at both ends of the moving pedestal in the moving direction or at either end thereof, and is not provided at the intermediate portion. The watering sprinkler for tunnel construction according to any one of claims 1 to 5, which is provided with a determination means for switching the operating state of the sprinkler according to the measurement result of a dust meter for measuring the amount of dust in the tunnel installed in the tunnel. Device. Any of claims 1 to 6 provided with a determination means for switching the energized state of the charging electrode according to the measurement result of the dust charge measuring device for measuring the charged state of the dust in the tunnel installed in the tunnel. The described sprinkler for tunnel construction. The tunnel construction according to any one of claims 1 to 7, wherein a determination means for switching the operating state of the sprinkler according to the measurement result of a hygrometer for measuring the humidity of the lining concrete installed on the lining concrete is provided. Water sprinkler.

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