JP2009150139A - Dust settling method applicable to tunnel blasting work - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a dust settling method applicable to tunnel blasting work, which achieves quick settlement of flying dust at a low cost. <P>SOLUTION: According to the dust settling method, a primary spray device 3 is arranged at a location away from a working face 2 of a tunnel 1, a secondary spray device 4 is arranged on a rear side of the primary spray device 3, and an air blower 5 for sucking outside air and blowing the same is hung at a location above the secondary spray device 4, followed by attaching a spray nozzle 5c to the tip of the air blower 5. Then a door 8 at a pit mouth 6 is closed, and the working face 2 is blasted, followed by emitting spray to the working face 2 by the primary spray device 3 immediately after the blasting, to thereby catch and settle the dust flying in the pit. After the lapse of a predetermined time, spray to the working face 2 is emitted by the secondary spray device 4 to catch and further settle fine dust still flying, and after the lapse of a predetermined time, the door 8 at the pit mouth 6 is opened to blow outside air to the working face 2 by the air blower 5, followed by emitting spray to the working face 2 by the spray nozzle 5c. In this manner while the fine dust still flying in the pit is almost completely settled, it is pressed to the outside of the pit by blowing power and removed. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a dust calming method for tunnel blasting work.

  Conventional dust blasting techniques for tunnel blasting are disclosed in Patent Documents 1 and 2. The technology of Patent Literature 1 is equipped with a movable carriage equipped with a retractable wind pipe equipped with an exhaust fan, arranged in a number corresponding to the length of the tunnel, and connected the front and rear ends of each wind pipe, Each exhaust fan is actuated to suck dust from the blasting from the front wind pipe and remove it from the rear wind pipe to the outside of the mine.

  The technology of Patent Document 2 is that a telescopic wind pipe provided with a blower fan is piped in the tunnel, a dust collector is arranged in the vicinity of the face, the blower fan is activated to blow the outside air toward the face and blast It is characterized in that the dust in the mine can be collected with a dust collector so that the air in the mine can be purified.

By the way, each of the above-described techniques needs to suck almost all the air in the space in order to remove the dust, and there is a problem that it takes time to remove the dust. In particular, since fine fine dust floats in the air and is difficult to remove, there is a problem that ventilation tends to be insufficient. In addition, the former technique requires a number of trucks corresponding to the length of the tunnel, and the latter technique also uses an expensive dust collector.
JP 2004-68374 A JP 2003-314200 A

  The problem to be solved by the present invention is to provide a dust soaking method for tunnel blasting construction which can solve these conventional problems and can quickly settle dust scattering at low cost.

The configuration of the present invention that solves this problem is as follows.
1) A method of calming dust scattered by the blasting of tunnel construction. A primary spraying device that sprays fine mist onto the face is located at a predetermined distance from the face, and the fine mist is placed behind the primary spray equipment. A secondary spray device is sprayed on the face, spraying fine mist onto the face immediately after blasting with the primary spray device, capturing dust scattered by the fine mist, dropping it to the ground, and then calming for a predetermined time A dust spill method for tunnel blasting works, characterized by spraying fine mist onto the face with a secondary spray device after passing, capturing fine dust still floating by the fine mist and dropping it to the ground to further calm down 2) A blower that sucks air outside the tunnel and blows it to the face is provided, a door is provided at the tunnel entrance, the door is opened, and the air in the tunnel is pushed out of the tunnel by the power of the blower. The above 1), which is ventilated Dust calming method for tunnel blasting work 3) Dust calming method for tunnel blasting work described in 2) above, in which a spray nozzle that sprays fine mist onto the face is attached to the outer peripheral position of the tip of the blower 4) Sterilizes the water supplied to the spray nozzle 3) Dust calming method for tunnel blasting construction described in 3) above, wherein a plurality of small exhaust fans for blowing air toward the tunnel entrance are installed along the longitudinal direction of the tunnel. It is in the dust calming method of tunnel blasting construction described in any one.

  In this invention, if it sprays toward a face with a primary spray apparatus immediately after blasting, the fine mist will disperse and will fall to the ground. Most of the dust settles in this process, and floating dust is greatly reduced. After that, when spraying toward the face with a secondary spray device after a predetermined time has elapsed, the fine dust still floating in the fine mist is captured and further subsided. Therefore, the dust can be settled in a short time without waiting for the entire ventilation in the tunnel with an inexpensive device as compared with the prior art.

  In the present invention, when a blower that sucks air outside the tunnel and blows it to the face is arranged, the door of the wellhead is opened and the air inside the tunnel is pushed out of the tunnel by the power of the blower and ventilated. Can improve the working environment. A spray nozzle is attached to the blower, and fine dust can be settled in a short time by the fine mist. In addition, when a plurality of small exhaust fans that blow air toward the tunnel entrance are installed, the power of air blowing toward the removal direction increases and ventilation can be performed in a shorter time. In addition, providing a sterilizing device for sterilizing the water supplied to the spray nozzle can provide a working environment in consideration of the health of the worker, and is particularly effective when supplying water from a water source such as a river or a pond. Embodiments of the present invention will be specifically described below with reference to the drawings.

  FIG. 1 is an explanatory view showing dust calming of the tunnel blasting construction of the embodiment, FIG. 2 is an explanatory view of the primary spraying apparatus of the embodiment, FIG. 3 is an explanatory view of the secondary spraying apparatus of the embodiment, and FIG. Explanatory drawing of an air blower, FIG. 5 is a chart which shows the process of an Example.

  In the figure, 1 is a tunnel, 2 is a face, 3 is a primary spray device, 3a is a frame, 3b is a spray nozzle, 3c is a water supply hose, 3d is a protective plate, 3e is a sandbag, 3f is a water supply machine, 3g is a water supply pump, 3h is a water supply tank, 3i is a filter, 3j is a protective plate, 3k is an operation panel, 3m is a reel, 4 is a secondary spray device, 4a is a ventilation duct, 4b is a blower fan, 4c is a spray nozzle, 4d is a carriage, 4e Is a suspension member, 4f is a water supply pump, 4g is a water supply tank, 4h is a water supply hose, 5 is a blower, 5a is a wind pipe, 5b is a blower fan, 5c is a spray nozzle, 5d is a water supply pump, 5e is a sterilizer, 5f Is a truck, 5 g is a water supply hose, 6 is a wellhead, 7 is an exhaust fan, 8 is a door, 9 is an ignition box, and D is off.

  In this embodiment, as shown in FIG. 1, the primary spray device 3 is arranged at a side wall position 40 m away from the face 2 of the tunnel 1, and the secondary spray device 4 is arranged at a position 60 m away from the face 2, A long blower 5 is suspended over a wellhead 6 from a position slightly behind the spray device 4. A plurality of small exhaust fans 7 are installed on the inner wall of the tunnel 1 at a predetermined interval toward the rear of the tunnel 1.

  As shown in FIG. 2, the primary spray device 3 has three spray nozzles 3b attached to the upper end of the frame 3a so that the spray angle can be adjusted, a water supply hose 3c is connected to each spray nozzle 3b, and each spray nozzle 3b is connected to each spray nozzle 3b. A protective plate 3d that protects against the blast is attached, and a sandbag 3e is placed under the frame 3a so as not to be blown away by the blast. The water feeder 3f includes a water supply pump 3g having a water supply capacity of 26 to 30 L / min, a nozzle water pressure of 8 MPa, a water supply tank 3h, and a filter 3i having a backwash function, and is connected to the water supply pump 3g to protect it from the blast. A plate 3j is attached to the entire surface. The water in the water supply tank 3h is supplied after being filtered and sterilized by the filter 3i.

  As shown in FIG. 3, the secondary spray device 4 includes an electric blower fan 4 b at the rear of the bellows-shaped ventilation duct 4 a, and a plurality of spray nozzles 4 c are arranged on the airflow side in the upper half position of the outer periphery of the outlet of the ventilation duct 4 a. It is attached at regular intervals toward. This is mounted on the upper stage of the carriage 4d so that the blowing direction can be adjusted up and down by the suspension member 4e. The water supply pump 4f and the water supply tank 4g are arranged on the lower stage of the carriage 4d, and each spray nozzle 4c and the water supply pump 4f are supplied with water. Connected with hose 4h.

  As shown in FIG. 4, the blower 5 includes an electric blower fan 5b at the rear end (position of the wellhead 6) of the wind tube 5a, and a plurality of spray nozzles 5c are directed forward around the front end of the wind tube 5a. It is attached. A water supply pump 5d having a nozzle water pressure of 8 MPa and a truck 5f equipped with a sterilizer 5e are arranged near the face 2 of the blower 5, and each spray nozzle 5c and the water supply pump 5d are connected by a water supply hose 5g. Water is supplied from a water source such as a river, a pond, or a water tank outside the tunnel 1 and sterilized by a sterilizer 5e, and then sent out by a water supply pump 5d.

  The present embodiment will be described with reference to FIGS. 1 and 5. A rock drill is used to drill a plurality of blast holes in the face 2 and load an explosive, and an electrical lead extending from the explosive is routed backward to connect to an igniter. The door 8 of the wellhead 6 is closed, and the worker retreats behind the ignition box 9 to explode the explosive. After 5 seconds from blasting, the spray is sprayed onto the face 2 by the primary spray device 3, and the dust scattered by the fine mist is captured and dropped to the ground. Most of the dust settles in this process, and floating dust is greatly reduced. Next, when about 4 minutes have passed since the blasting, the secondary spraying device 4 is actuated to spray toward the face 2, and the fine dust still floating in the fine mist is captured and further calmed down.

  When about 11 minutes have passed since the blasting, the door 8 of the wellhead 6 is opened and the blower 5 is operated, and the outside air taken in through the wind pipe 5a is blown to the face 2 and sprayed to the face 2 by the spray nozzle 5c. The fine dust that is still floating in the mist is further supplemented and almost completely calmed down. At the same time, a plurality of exhaust fans 7 are operated to increase the power of air blowing in the exhaust direction, and are easily removed to the rear of the tunnel 1. The primary spray device 3 and the secondary spray device 4 are stopped.

  After this blowing is continued for about 1 hour, the shear D of the face 2 is removed and the support work is carried out. After 5 to 6 hours, the next blasting is performed, and the dust is calmed and ventilated in the same manner. The tunnel 1 is constructed repeatedly. The humidity in the tunnel 1 is increased by spraying, moisturizing the concrete surface of the mine wall to enhance the curing effect, and lowering the temperature in the tunnel 1 to improve the working environment.

  As described above, according to the present embodiment, the primary spray device 3 and the secondary spray device 4 spray stepwise toward the face 2 immediately after blasting, so that the dust that the fine mist scatters is supplemented and settled early. Floating dust has been greatly reduced. Thereafter, the air was blown to the face 2 and sprayed by the blower 5, so that the fine dust still floating in the fine mist was almost completely settled and removed so as to be pushed out of the well by the force of the air blow. Therefore, it was possible to calm down in a short time without waiting for the entire ventilation in the tunnel 1 with an inexpensive device as compared with the prior art.

  FIG. 6 shows another example of the blower of the embodiment. FIG. 6 is an explanatory diagram of a blower of another example of the embodiment. In another example of the embodiment shown in FIG. 6, a tubular spray nozzle 5c in which a plurality of spray holes are formed is attached to the front end portion of the wind pipe 5a in the vertical direction so that fine mist can be sprayed forward by the force of blowing air. I have to. Therefore, compared with an Example, it can demonstrate an equivalent performance, simplifying the structure of the spray nozzle 5c, and can implement at low cost. In other respects, the reference numeral, the configuration, and the operational effects are the same as in the embodiment.

  The technique of the present invention is useful for tunnel blasting work.

It is explanatory drawing which shows the dust calm of the tunnel blasting construction of an Example. It is explanatory drawing of the primary spraying apparatus of an Example. It is explanatory drawing of the secondary spraying apparatus of an Example. It is explanatory drawing of the air blower of an Example. It is a chart which shows the process of an Example. It is explanatory drawing of the air blower of the other example of an Example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Tunnel 2 Face 3 Primary spray apparatus 3a Frame 3b Spray nozzle 3c Water supply hose 3d Guard plate 3e Sandbag 3f Water supply machine 3g Water supply pump 3h Water supply tank 3i Filter 3j Guard plate 3k Operation panel 3m Reel 4 Secondary air blower 4a Ventilation duct 4b Fan 4c Spray nozzle 4d Carriage 4e Suspension member 4f Water supply pump 4g Water supply tank 4h Water supply hose 5 Blower 5a Wind pipe 5b Air blow fan 5c Spray nozzle 5d Water supply pump 5e Sterilizer 5f Truck 5g Water supply hose 6 Fan outlet 7 Door 8 Box D

Claims (5)

  A method of calming dust scattered by the blasting of tunnel construction, where a primary spray device that sprays fine mist onto the face is located at a predetermined distance from the face, and the fine mist is placed behind the primary spray equipment. A secondary spray device is sprayed to the surface, and immediately after blasting, the primary spray device sprays fine mist onto the face, captures the dust scattered by the fine mist, drops it to the ground, calms down, and then passes for a predetermined time. A dust squeezing method for tunnel blasting, characterized by spraying fine mist onto the face with a secondary spray device, capturing fine dust still floating in the fine mist, dropping it onto the ground, and further calming down.   A blower that sucks air outside the tunnel and blows it to the face is provided, a door is provided at the tunnel entrance, and the door is opened and the air inside the tunnel is pushed out of the tunnel by the power of the blower. The method for calming dust in tunnel blasting works according to claim 1, wherein ventilation is performed.   The dust sedation method for tunnel blasting work according to claim 2, wherein a spray nozzle for spraying fine mist onto the face is attached to the outer peripheral position of the tip of the blower.   The method for calming dust in a tunnel blasting work according to claim 3, further comprising a sterilizer for sterilizing water supplied to the spray nozzle.   The dust calming method for tunnel blasting work according to any one of claims 1 to 4, wherein a plurality of small exhaust fans for blowing air toward the tunnel entrance are installed along the longitudinal direction of the tunnel.

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