JP2017190664A - Excavation method of tunnel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the excavation work efficiency of a tunnel.SOLUTION: A pit face K of a tunnel T is excavated in a state that a tip of a crusher 2 of a transportation device 1 is separated from the pit face K by an evacuation length Ls. Then, a primary belt conveyor 3a of a telescopic belt conveyor 3 is made to advance toward the pit face K up to a position in which the tip of the crusher 2 is separated from the pit face K by a work space length Lw. Then, muck around the pit face K is crushed by the crusher 2, and after that, and conveyed to a pit mouth by the telescopic belt conveyor 3, a tale piece bogie 35, and a drawing belt conveyor 40. Next, after a finish of the conveyance of the muck by the telescopic belt conveyor 3, the primary belt conveyor 3a is made to retreat up to a position in which the tip of the crusher 2 is separated from the pit face K by an evacuation length Ls for the preparation of succeeding excavation. Simultaneously, the secondary belt conveyor 3b is made to advance toward the pit face K. Then, after a finish of the conveyance of the muck by the drawing belt conveyor 40, the tale piece bogie 35 is made to advance toward the pit face K simultaneously with the advance/retreat or the advance of the secondary belt conveyor 3b, and a tip of the drawing belt conveyor 40 is drawn.SELECTED DRAWING: Figure 19

Description

The present invention relates to drilling Kezukata method of tunnel.

  In tunnel excavation work, when digging hard rocks, a blasting method is adopted in which the tunnel is excavated by blasting dynamite on the bedrock. In addition to using a dump trunk or the like to transport the gap generated by blasting from the face to the tunnel entrance, after further narrowing the gap generated by blasting with a crusher, place it on the belt conveyor. There is a way to carry. When using a belt conveyor, it is possible to prevent exhaust gas contamination and dust pollution in the tunnel by not using a dump truck, etc., and to improve the safety of the work environment and to transport by labor saving. Cost can be reduced. Furthermore, by using a stretch belt conveyor instead of a belt conveyor, the stretch belt conveyor can be extended so that the moving distance of the stacking heavy equipment that loads the crusher on the crusher can be shortened. Can be achieved.

  The tunnel excavation technique using such a blasting method is described in, for example, Patent Document 1, and a gap generated when the tip of the tunnel is crushed by blasting or the like is transferred to the first crusher and the rear thereof. A technique is disclosed in which the size is reduced by a second crusher arranged in a column and then transported outside the tunnel by a carry-out belt conveyor arranged in a column behind the second crusher. In Patent Document 1, since the crusher has two stages, the capacity of each crusher can be reduced, so that each crusher can be reduced in size and the crusher conveyed from the crusher to the belt conveyor. It is disclosed that the diameter of the belt can be set to a target value, so that the belt conveyor can be reduced in size, the belt conveyance speed can be improved, and the conveyance work efficiency of the gap can be improved.

  Further, as another tunnel excavation technique using the blasting method, for example, Patent Document 2 discloses a belt conveyor system in which a Belcon vehicle, a backup deck, and an extension type belt conveyor are sequentially arranged behind a crusher. Has been. This backup deck is provided with a belt storage that accommodates a conveyor belt that can be expanded and contracted by moving the Belcon cart back and forth.

JP-A-11-350880 JP 2002- 211730 A

Problems However, in Patent Document 2 described above, sufficient consideration has not been made for the arrangement preparation before and after carrying device drilling operations of the tunnel, that has improved drilling efficiency of the overall tunnel is inhibited, that There is.

The present invention has been made from the above-described technical background, and an object of the present invention is to provide a technique capable of improving the excavation work efficiency of a tunnel .

To solve the above problems, Kezukata method excavation of tunnels of the present invention as set forth in claim 1, and first conveying means which are tandem arranged sequentially along a direction toward the wellhead from (a) Tunnel Face A step of excavating the face in a state in which a leading end of a carrying device having a second carrying means is separated from the face by a retracted length; and (b) after the step (a), the first carrying means. Among the plurality of belt conveyors, the one or more first belt conveyors on the upstream side of the excavated material are advanced toward the face after the step (a), so that the tip of the conveyor device is (A) a step of extending the first transport means to a position separated from the working face after the step by a work space length; and (c) after the step (b), the excavated material generated by the step (a) is transported. Transport toward the wellhead by the device And (d) in the step (c), the transporting of the excavated material by the first transporting means is completed, and the transporting of the first belt conveyor toward the wellhead is performed by moving the first belt conveyor backward. Shrinking the first transport means to a position where the tip of the device is separated from the face after the step (a) by the retracted length; (e) simultaneously with the step (d), a plurality of the first transport means Among the belt conveyors, the step of advancing one or more second belt conveyors on the downstream side of the excavated material toward the face after the step (a), and (f) the second conveying means. After the transport of the excavated material at the end of the second conveyor means at the same time as the advancement of the second belt conveyor in the step (e) or the step (e). a) Work to stretch toward the face after the process When, and repeating the.

According to a second aspect of the present invention, in the first aspect of the present invention, in the step (b), the advance length of the first belt conveyor is Ls as the retracted length, and the working space length as Ls. Lw, when the excavation length in the step (a) is Me, it is Ls−Lw + Me, and in the step (d), the retracted length of the first belt conveyor is Ls−Lw, and the step (e) in the forward length of the second belt conveyor is to the drilling length in step (f), stretching the length of the second transport means is characterized Rukoto set to the drilling length.

Further, the present invention according to claim 3 is the invention according to claim 1 or 2 , wherein the support is provided around the face of the tunnel after the step (d) and before the step (a). It has the process of implementing a process .

Moreover, this invention of Claim 4 WHEREIN: The invention of any one of the said Claims 1-3 WHEREIN: The said (c) process is the excavation thing produced | generated by the (c1) said (a) process. A step of crushing by a self-propelled crushing means disposed between the face and the first transporting means, and (c2) excavation crushed by the step (c1) of the first transporting means. And a step of transporting through the second transport means in order.

Further, the present invention according to claim 5 is the invention according to claim 4, wherein, in the step (c1), a plurality of the self-propelled crushes arranged in tandem along the extending direction of the tunnel. The excavated material is crushed by means.

Further, in the present invention described in claim 6, in the invention described in any one of claims 1 to 5, the step of excavating the face in the step (a) is the face before the step (a). A step of forming a blast hole, a step of placing an explosive in the blast hole, and a step of excavating a face before the step (a) by exploding the explosive.

According to the first aspect of the present invention, in the step (d) and the step (e), the second conveyor of the first transporting means is simultaneously moved backward with the first belt conveyor of the first transporting means. By moving the belt conveyor forward, it is possible to efficiently prepare for the arrangement of the transporting device before and after the step (a), so it is possible to improve the excavation work efficiency of the tunnel .

According to the invention described in claim 2, the conveying device can be advanced while the first conveying means of the conveying device is expanded and contracted to an appropriate position, and the arrangement preparation of the conveying device before and after the step (a) is efficiently performed. Therefore, the excavation work efficiency of the tunnel can be improved .

According to the invention described in claim 3, since the support work can be carried out in a state in which the retracting length is secured between the face of the tunnel and the tip part of the transport device, the workability of the support work can be improved. It becomes possible.

According to the invention described in claim 4, since the excavated material generated by the tunnel excavation work is transported in a crushed state, the excavated material transport work efficiency can be improved, so that the tunnel excavation work efficiency is improved. It becomes possible to make it.

According to the fifth aspect of the present invention, the excavation work efficiency can be improved, so that the tunnel excavation efficiency can be improved.

According to invention of Claim 6, it becomes possible to prevent the conveyance apparatus from being damaged or destroyed due to the collision of the crushed material generated during the blasting process.

It is a top view of the conveyance apparatus which concerns on one embodiment of this invention. It is a side view of the conveying apparatus of FIG. It is a perspective view of the crusher which comprises the conveying apparatus of FIG. It is an expansion perspective view of the area | region A enclosed with the broken line of FIG. It is a schematic block diagram of the crusher of FIG. (A) is a plan view of the secondary crusher throwing-in portion and the shearing crushing portion of FIG. 3, and (b) is a schematic view of the secondary crusher throwing-in portion and the shearing crushing portion of FIG. 6 (a) as viewed from the side. It is a block diagram. (A) is a principal part enlarged block diagram of the crushing part of FIG.6 (b), (b) is a top view of the crushing chamber of the crushing part of Fig.7 (a). It is a schematic block diagram of the detection apparatus which notifies the propriety of the slot injection | throwing-in in the slot injection | throwing-in part of a secondary crusher. It is a schematic block diagram of the monitoring apparatus for monitoring the condition of the slipping in the slipping-in part of the secondary crusher. It is a side view of the conveyance apparatus in a tunnel at the time of the blasting process in tunnel excavation work. It is a side view of the conveyance apparatus in the tunnel after the blasting process in the tunnel excavation work following FIG. It is a top view of the conveying apparatus in the tunnel after the blasting process in the tunnel excavation work following FIG. It is a side view of the conveying apparatus of FIG. It is a top view of the conveying apparatus in the tunnel at the time of the gap conveyance process in the tunnel excavation operation following FIG. It is a side view of the conveying apparatus of FIG. It is a top view of the conveying apparatus in a tunnel at the time of the process which has thrown in the slip generated by blasting in a tunnel excavation work directly to a secondary crusher. It is a side view of the conveying apparatus of FIG. It is a figure which shows the signal display of the rotary light which displays the throwing possibility of insertion with respect to the primary crusher and secondary crusher of a conveying apparatus, and its response | compatibility. (A) is a top view of the conveying apparatus which concerns on the 2nd Embodiment of this invention, (b) is a side view of the conveying apparatus of Fig.19 (a). (A) is a side view of the transport device in the tunnel at the time of the blasting process in the tunnel excavation work of the second embodiment, (b) is the inside of the tunnel after the blasting process in the tunnel excavation work following FIG. 20 (a) It is a side view of a conveying apparatus. (A) is a side view of the transport device in the tunnel in the preparation stage of the slip transporting operation following FIG. 20 (b), and (b) is a side view of the transport device in the tunnel in the slip transporting operation following FIG. 21 (a). It is. (A) is a side view of the transport device in the tunnel immediately before the blast preparation process following FIG. 21 (b), and (b) is a tunnel in the middle of movement of the crusher and the telescopic belt conveyor in the blast preparation process following FIG. 22 (a). It is a side view of an inside conveyance device. (A) is a side view of the transport device in the tunnel after the movement of the crusher and the elastic belt conveyor in the blast preparation process following FIG. 22 (b), and (b) is an extension in the blast preparation process following FIG. 23 (a). It is a side view of the conveying apparatus in the tunnel after the movement of a belt conveyor is completed. (A) is a side view of the transport device in the tunnel during the blasting process in the tunnel excavation work following FIG. 23 (b), and (b) is the transport in the tunnel in the preparatory stage of the slip transport work following FIG. 24 (a). It is a side view of an apparatus.

  Hereinafter, an embodiment as an example of the present invention will be described in detail with reference to the drawings. Note that components having the same function are denoted by the same reference symbols throughout the drawings for describing the embodiment, and the repetitive description thereof will be omitted.

  (First embodiment)

  First, the structural example of the conveying apparatus which concerns on this Embodiment is demonstrated with reference to FIG. 1 and FIG. FIG. 1 is a plan view of the carrying device according to the present embodiment, and FIG. 2 is a side view of the carrying device of FIG.

  The transport device 1 of the present embodiment is a slip transport device that transports, for example, a slip (excavated matter) generated when excavating the face K of the tunnel T by blasting to a tunnel T, and a crusher (crushing means). 2 and an elastic belt conveyor (conveyor) 3.

  As shown in FIG. 1, the transport device 1 is arranged in tandem in order from the face K to the wellhead in a state of being brought to one side in the width direction of the tunnel T, and the other in the width direction of the tunnel T. One side can be used as a passage for various heavy equipment such as heavy equipment for blasting charges, heavy equipment for loading, heavy equipment for supporting blowing, and the like.

  The crusher 2 is a crusher that crushes the gap generated by blasting into a size that can be carried by the telescopic belt conveyor 3, and includes a primary crusher 2a and a secondary crusher 2b. The primary crusher 2 a and the secondary crusher 2 b are constituted by, for example, self-propelled crushers, and are arranged in series in order from the face K to the telescopic belt conveyor 3.

The processing capacity of the primary crusher 2a is, for example, 400 t / h (267 m ³ / h). The discharge gap (offset, hereinafter referred to as OSS) is, for example, 190 mm. The diameter of the gap after crushing is, for example, 300 mm or less. The crushing capacity is, for example, 280 t / h, and the crushing unnecessary part is, for example, 120 t / h.

  The processing capacity, crushing capacity, and crushing unnecessary part of the secondary crusher 2b are, for example, the same as those of the above-described primary crusher 2a. In addition, the OSS of the secondary crusher 2b is set to 190 mm, for example, similarly to the primary crusher 2a. However, the secondary crusher 2b is crushed by the fact that the crushed crush by the primary crusher 2a is conveyed to the secondary crusher 2b. The diameter of the gap can be, for example, 250 mm or less. However, the offset of the secondary crusher 2b may be adjusted (smaller than 190 mm) so that the diameter of the gap discharged from the secondary crusher 2b is 250 mm or less.

  The telescopic belt conveyor 3 is a conveying means that conveys the gap discharged from the secondary crusher 2b toward the wellhead, and includes, for example, a primary belt conveyor 3a and a secondary belt conveyor 3b. The primary belt conveyor 3a and the secondary belt conveyor 3b are transport devices that can move (self-run) independently of each other. For example, the secondary belt conveyor 3a and the secondary belt conveyor 3b can be expanded and contracted (moved) along the longitudinal direction of the tunnel T. They are arranged in tandem in order from the rear of the crusher 2b toward the wellhead. The term “reciprocal” is usually a term that expresses the relationship between the two, but here also applies to the case where there are three or more telescopic belt conveyors 3.

  The belt width of the stretchable belt conveyor 3 is, for example, about 750 mm or 900 mm, and a relatively small stretchable belt conveyor 3 can be used. For this reason, the cost of the elastic belt conveyor 3 can be reduced. Moreover, since the conveyance speed of a gap can be improved, the conveyance efficiency of a gap can be improved. The carrying capacity of the extension belt conveyor 3 is 600 t / h, for example.

  Further, at the time of blasting, the crusher 2 and the telescopic belt conveyor 3 move to a position where the slip scattered from the face K at the time of blasting does not reach. That is, the primary belt conveyor 3a moves to a position where it overlaps the upper side of the secondary belt conveyor 3b, and the primary crusher 2a and the secondary crusher 2b move to a position away from the face K accordingly. Thereby, it is possible to prevent the crusher 2 and the telescopic belt conveyor 3 from being damaged due to the gap scattered from the face K at the time of blasting.

  On the other hand, the crusher 2 and the telescopic belt conveyor 3 approach the face K when carrying the gap after blasting. That is, the primary crusher 2a and the secondary crusher 2b approach the face K, and the primary belt conveyor 3a moves toward the face K. Thereby, since the distance from the gathering position of the gap in the vicinity of the face K to the crusher 2 can be shortened, the conveyance time when conveying the gap from the vicinity of the face K to the crusher 2 can be shortened.

  Next, a configuration example of the above-described crusher 2 will be described with reference to FIGS. 3 is a perspective view of the crusher constituting the conveying device of FIG. 1, FIG. 4 is an enlarged perspective view of a region A surrounded by a broken line in FIG. 3, FIG. 5 is a schematic configuration diagram of the crusher of FIG. Fig. 6 is a plan view of the second crusher throwing portion and the shattering portion of Fig. 3, and Fig. 6 (b) is a schematic configuration of the second crusher throwing portion and the shattering portion of Fig. 6 (a) as viewed from the side. FIG. 7A is an enlarged configuration diagram of the main part of the crushing part in FIG. 6B, and FIG. 7B is a plan view of the crushing chamber of the crushing part in FIG.

  Here, the slip Za indicates a slip generated by blasting, the slip Zb indicates a slip discharged from the primary crusher 2a, and a slip Zc indicates a slip discharged from the secondary crusher 2b. Moreover, since the structure of the slip-in part of the primary crusher 2a and the secondary crusher 2b and the structure of the shattering part are the same, the slip-in part of the secondary crusher 2b is representatively shown in FIG.

  As shown in FIGS. 3 and 5, the primary crusher 2a and the secondary crusher 2b are respectively composed of traveling parts 4a, 4b, slip-in parts 5a, 5b, slip-crushing parts 6a, 6b, and belt conveyor parts 7a, 7b. And integrated.

  The running parts 4a and 4b of the primary crusher 2a and the secondary crusher 2b are mechanism parts for enabling the primary crusher 2a and the secondary crusher 2b to self-run, and are configured by, for example, an endless track. The endless track is configured by attaching a crawler belt formed by connecting a plurality of steel crawler plates in an endless ring-like manner around a plurality of rotating rollers. However, the traveling units 4a and 4b are not limited to being configured with an endless track and can be variously modified. For example, the traveling units 4a and 4b may be configured to travel with tire wheels.

  The slip-in portions 5a and 5b of the primary crusher 2a and the secondary crusher 2b are conveying means for transporting the slips thrown into the slip-in portions 5a and 5b to the slip crushing portions 6a and 6b, as shown in FIGS. In addition, a feeder 10 and a hopper 11 integrally mounted on a frame body above the feeder 10 are provided.

  The feeder 10 is constituted by, for example, a grizzly feeder, and integrally includes a trough 10a and a grizzly deck 10b downstream thereof. The trough 10a is a plate that accepts a slip inserted through the hopper 11 of the slip input portions 5a and 5b, and is installed in a state that is horizontal or forward inclined (inclined so as to be lowered toward the grizzly deck 10b). . The trough 10a is mechanically imparted with vertical vibrations so that the slip on the trough 10a is sent to the front grizzly deck 10b. The grizzly deck 10b is a belt conveyor installed below the grizzly deck 10b by sifting through a plurality of grizzly bars with a size of the gap sent from the trough 10a that does not need to be crushed. It is a mechanism part mounted on (not shown) etc.

  The shear crushing portions 6a and 6b of the primary crusher 2a and the secondary crusher 2b are mechanisms for crushing the shear into a predetermined size (diameter), and are configured by, for example, a single toggle jaw crusher. . However, the shearing crushing portions 6a and 6b are not limited to the single toggle jaw crusher and can be variously changed. For example, a double toggle jaw crusher or a low head jaw crusher may be used.

  As shown in FIGS. 5, 6 (b), and 7, the shear crushing portions 6 a and 6 b are oscillated by a fixed tooth plate 13 a mounted on the frame of the primary crusher 2 a and the secondary crusher 2 b and by power. A moving tooth plate 13b mounted on the swing jaw 14 and a crushing chamber 15 formed in a substantially V shape by facing these teeth at a predetermined angle.

  The swing jaws 14 of the shearing portions 6a and 6b are installed so that the support shaft 14a (see FIG. 6B) coincides with the eccentric shaft. At the time of the crushing process, the swing jaw 14 is oscillated between one of the toggle plates 16 (see FIG. 6B and FIG. 7) and the eccentric shaft. At this time, the movement of the swing jaw 14 changes from a circular motion at the upper part to an arc-shaped movement from an elongated elliptical movement as it approaches the lower part. In this state, the gap supplied to the crushing chambers 15 of the crushing sections 6a and 6b is crushed by a compressing action caused by a swinging motion of the moving tooth plate 13b or a collision between crushed objects while falling by gravity. The slip crushed in the crushing chamber 15 of the slip crushing portions 6 a and 6 b is placed on the belt conveyor portions 7 a and 7 b below the crushing chamber 15. As shown in FIG. 7 (b), the minimum gap D between the valley of the fixed tooth plate 13a and the peak of the moving tooth plate 13b is called a set, and when the minimum gap D is the maximum, the open side set is set. It is called a closed side set. The above-mentioned OSS is an interval when the opening side is set.

  The belt conveyor portion 7a of the primary crusher 2a is a conveying means for carrying the slip Zb discharged from the slip crushing portion 6a of the primary crusher 2a to the slip input portion 5b of the secondary crusher 2b at the rear stage in the longitudinal direction of the tunnel T. At the time of transporting the slip, the primary crusher 2a is arranged such that the front end portion of the belt conveyor portion 7a is related to a part of the slip input portion 5b of the secondary crusher 2b at the subsequent stage. The gap conveying capacity of the belt conveyor unit 7a is, for example, 600 t / h.

  The belt conveyor portion 7b of the secondary crusher 2b is a conveying means for conveying the slip Zc discharged from the slip crushing portion 6b of the secondary crusher 2b to the primary belt conveyor 3a of the telescopic belt conveyor 3. At the time of carrying the slip, the secondary crusher 2b is arranged such that the front end portion of the belt conveyor portion 7b is related to a part of the primary belt conveyor 3a in the subsequent stage. The slip conveying capacity of the belt conveyor unit 7b is, for example, 600 t / h.

  Next, FIG. 8 is a schematic configuration diagram of a detection device that informs whether or not a slippage insertion is possible at a slipping unit of the secondary crusher. Although the primary crusher 2a is also provided with a detection device, the detection device of the primary crusher 2a and the detection device of the secondary crusher 2b are the same, and the detection device of the secondary crusher 2b is shown in FIG. 8 as a representative. ing.

  The detection device 20 is a device for notifying whether or not a gap can be inserted into the hopper 11 by detecting the position of the top end of the gap in the hopper 11, and includes a plurality of sensors 20a, a program relay circuit 20b, a rotating lamp 20c. However, the number of sensors 20a is not limited to a plurality and may be one.

  Each sensor 20 a is a device that detects the position of the top edge of the gap in the hopper 11, and is mounted on a frame body above the hopper 11. Each sensor 20a is constituted by, for example, an optical distance sensor or an ultrasonic distance sensor using a laser diode or LED (Light Emitting Diode) as a light source, and is electrically connected to the program relay circuit 20b through a wiring. Has been.

  The program relay circuit 20b is a circuit that controls turning on (flashing or lighting) or turning off (turning off) the rotating lamp 20c based on a detection signal from each sensor 20a, and is electrically connected to the rotating lamp 20c through wiring. Yes. The program relay circuit 20b turns on (blinks or lights up) the rotating lamp 20c when the alarm is turned on for all the sensors 20a (that is, when the top position of the gap of the detection location exceeds a predetermined height). In this way, it is informed that it is impossible to insert the gap. However, here, the case where the rotating lamp 20c is turned on when all of the plurality of sensors 20c are turned on has been described. However, the present invention is not limited to this. For example, at least one selected from the plurality of sensors 20a is selected. The rotating lamp 20c may be turned on when one is turned on.

  The revolving light 20c is a display means for notifying whether or not a gap is inserted into the hopper 11 by turning on (flashing or lighting) or turning off (extinguishing) based on a control signal from the program relay circuit 20b. Is also mounted at an easily visible position on the upper frame. For example, whether or not the slippage of the primary crusher 2a and the secondary crusher 2b into the slippage input portions 5a and 5b can be determined by an operator who transports the slippage generated by blasting to the crusher 2 is performed by the primary crusher 2a and the secondary crusher 2b. Judgment is made by confirming the on / off state of the rotating lamps 20c arranged in each.

  Next, FIG. 9 is a schematic configuration diagram of a monitoring device for monitoring the state of slippage at the slipping-in portion of the secondary crusher. Although the monitoring device is also installed in the primary crusher 2a, the monitoring device of the primary crusher 2a and the monitoring device of the secondary crusher 2b are the same, and thus the monitoring device of the secondary crusher 2b is shown as a representative.

  The monitoring device 21 is a device that monitors the state of slippage in the hopper 11, and includes a plurality of web cameras 21a, a recorder 21b, a hub 21c, a personal computer 21d, and a monitor 21e.

  The web camera 21 a is a device that captures the situation of slippage in the hopper 11, and is mounted on a frame body above the hopper 11. However, if the image is directly placed on the primary crusher 2a and the secondary crusher 2b, the image may become unclear due to vibration or the like. In this case, the web camera scaffold is placed away from the primary crusher 2a and the secondary crusher 2b. It may be prepared separately. The web camera 21a is electrically connected to the recorder 21b through wiring.

  The recorder 21b is a device that stores moving images and still images taken by the web camera 21a, and is electrically connected to the personal computer 21d via the hub 21c. The personal computer 21d converts the signal sent from the web camera 21a into an image and displays it on the monitor 21e. The operator can monitor the displacement state in the hopper 11 in real time through the monitor 21e.

  Next, an example of a tunnel excavation method and a method for transporting a gap generated by excavation according to the present embodiment will be described with reference to FIGS. The excavation method is not particularly limited, and is, for example, NATM (New Australian Tunneling Method). The rock type is not particularly limited, and is, for example, sandstone.

  First, FIG. 10 is a side view of the transport device in the tunnel during the blasting process in the tunnel excavation work, and FIG. 11 is a side view of the transport device in the tunnel after the blasting process in the tunnel excavation work following FIG.

  Here, as shown in FIG. 10, for example, a dynamite is placed on the face K1 of the tunnel T by a self-propelled heavy equipment such as a hydraulic jumbo, and then the dynamite is blown (blasted). As shown in FIG. 11, the face K1 of the tunnel T is excavated. In addition, the face K2 of FIG. 11 has shown the face after excavation by blasting.

  In this blasting process, the primary belt conveyor 3a and the secondary belt conveyor 3b are arranged so as to overlap each other, and the primary crusher 2a, the secondary crusher 2b, the primary belt conveyor 3a, and the secondary belt conveyor 3b are scattered by blasting. Waiting at a position where the crushed material does not reach. Thereby, since the crushed material scattered by blasting can be prevented from hitting the primary crusher 2a, the secondary crusher 2b, the primary belt conveyor 3a and the secondary belt conveyor 3b, the primary crusher 2a resulting from the collision of the crushed material, Damage and destruction of the secondary crusher 2b, the primary belt conveyor 3a, and the secondary belt conveyor 3b can be prevented.

  12 is a plan view of the transport device in the tunnel after the blasting step in the tunnel excavation work following FIG. 11, and FIG. 13 is a side view of the transport device of FIG.

  Here, after ventilating the air in the tunnel T, as shown in FIG. 12, the primary crusher 2a, the secondary crusher 2b, and the primary belt conveyor 3a are moved toward the face K2. In addition, a self-propelled loading heavy machine 30 such as a side dump shovel for loading the crush Za generated by the blasting on the crusher 2 is moved to the face K2 of the tunnel T. Note that a space (distance) is provided between the front end portion of the primary crusher 2a after the stop of movement and the face K2 so that various operations such as the transporting work and the support work of the gap Za can be performed. Further, the loading heavy machine 30 to be used is not limited to one, but may be two, for example.

  Next, FIG. 14 is a plan view of the transporting device in the tunnel during the slip transporting process in the tunnel excavation work following FIG. 12, and FIG. 15 is a side view of the transporting device of FIG.

  Here, after starting driving of the primary crusher 2a, the secondary crusher 2b, the primary belt conveyor 3a, and the secondary belt conveyor 3b, as shown in FIGS. 30, the first crusher 2 a is inserted into the slipping-in portion 5 a of the primary crusher 2 a through the hopper 11.

  The shear Za introduced into the primary crusher 2a is crushed into a shear Zb having a predetermined diameter by the shear crushing section 6a of the primary crusher 2a, and then placed on the belt conveyor section 7a of the primary crusher 2a and placed on the secondary crusher 2b. It is thrown through the hopper 11 into the gap throwing portion 5b. The diameter of the gap Zb is, for example, 300 mm or less.

  The slip Zb thrown into the secondary crusher 2b is crushed by the slip crushing portion 6b of the secondary crusher 2b into a slip Zc having a predetermined diameter that can be stacked on the telescopic belt conveyor 3, and then the secondary crusher 2b It is placed on the belt conveyor section 7b and stacked on the primary belt conveyor 3a, and is further transferred to the secondary belt conveyor 3b and carried to the tunnel T. The diameter of the gap Zc is, for example, 250 mm or less.

  By the way, if the slip Za is continuously supplied only to the primary crusher 2a as it is, the transport amount of the slip is determined by the processing capacity of the primary crusher 2a, and thus the transport efficiency of the slip may be lowered. Therefore, in the present embodiment, the gap Za generated by the blasting is directly thrown into the secondary crusher 2b. FIG. 16 is a plan view of the transporting device in the tunnel at the time of introducing the shear generated by blasting in the tunnel excavation work directly into the secondary crusher, and FIG. 17 is a side view of the transporting device of FIG. In this case, even when the primary crusher 2a has no margin for processing and the slippage Za cannot be input, the secondary crusher 2b may have margin for processing. Therefore, the secondary crusher 2b having margin for processing may cause a blast. By directly feeding Za, the transporting efficiency of the slip can be improved.

  However, even if the slippage Za generated by blasting can be directly introduced into the secondary crusher 2b to improve the transport efficiency of the slippage, the slippage generated by blasting is simply thrown into the secondary crusher 2b. In some cases, the diameter of the gap discharged from the secondary crusher 2b may be larger than the target value. In that case, since the enlargement of the stretchable belt conveyor 3 in the subsequent stage of the secondary crusher 2b is caused, the cost increases.

  Therefore, in the present embodiment, when the shear Zb sent from the primary crusher 2a to the secondary crusher 2b is crushed by the secondary crusher 2b, the shear Za generated by blasting is thrown into the secondary crusher 2b. Directly put into part 5b. That is, a shear Zb of 300 mm or less after being crushed by the primary crusher 2a and a shear Za generated by blasting are simultaneously fed into the crushing chamber 15 of the shearing section 6b of the secondary crusher 2b. As a result, the inside of the crushing chamber 15 of the shear crushing portion 6b of the secondary crusher 2b is brought into a compacted state. Therefore, even if the OSS of the secondary crusher 2b is 190 mm that is the same as the OSS of the primary crusher 2a, the diameter from the secondary crusher 2b A gap Zb of 250 mm or less could be discharged. For this reason, since the secondary crusher 2b and the expansion-contraction belt conveyor 3 are not increased in size, the cost is not increased. Therefore, according to the present embodiment, in the case where the slip generated when excavating the tunnel T using the blasting method is set to a predetermined diameter or less and carried on the telescopic belt conveyor 3, the transport efficiency of the slip is improved. Can be improved. However, in some cases, the OSS of the secondary crusher 2b is adjusted (less than 190 mm) so that the diameter of the gap discharged from the secondary crusher 2b is 250 mm or less.

  Next, an example of a method for introducing a slip into the primary crusher 2a and the secondary crusher 2b will be described with reference to FIG. FIG. 18 shows the signal display of the rotating lamp that indicates whether or not the thrower can be inserted into the primary crusher and the secondary crusher of the transport device, and the correspondence. Note that blue indicates that it can be inserted, and red indicates that it cannot be inserted.

  Whether or not the slippage can be introduced is determined by whether an operator who transports the slippage around the face generated by blasting to the primary crusher 2a or the secondary crusher 2b is turned on and off of the rotary lamp 2c arranged in each of the primary crusher 2a and the secondary crusher 2b. Determination is made by confirming the display state (that is, determination is made based on the state of the top end position of the gap in the hopper 11 detected by the respective sensors 20a of the primary crusher 2a and the secondary crusher 2b).

  At this time, priority is given to the introduction of the slip into the primary crusher 2a. That is, when the signal display of the rotary lamp 20c of the primary crusher 2a can be turned on (blue) and the signal display of the rotary lamp 20c of the secondary crusher 2b can also be turned on (blue), the slip Za is inserted into the primary crusher 2a. . Next, when the signal display of the rotary lamp 20c of the primary crusher 2a can be turned on (blue) and the signal display of the rotary lamp 20c of the secondary crusher 2b cannot be turned on (red), the slippage Za is inserted into the primary crusher 2a. To do. Next, when the signal display of the rotary lamp 20c of the primary crusher 2a cannot be turned on (red) and the signal display of the rotary lamp 20c of the secondary crusher 2b can be turned on (blue), the secondary crusher 2b is given the slip Za. throw into. Next, when the signal display of the rotary lamp 20c of the primary crusher 2a cannot be turned on (red) and the signal display of the rotary lamp 20c of the secondary crusher 2b cannot be turned on (red), a standby is performed. Thus, by giving priority to the introduction of the slip to the primary crusher 2a, the slip Zb discharged from the primary crusher 2a is always added to the secondary crusher 2b when the slip Za generated by blasting is directly input to the secondary crusher 2b. Therefore, it is possible to discharge a gap Zc having a diameter equal to or smaller than a predetermined diameter from the secondary crusher 2b.

  Further, during the crushing process of the gap, the situation of the gap in the hopper 11 of each of the primary crusher 2a and the secondary crusher 2b is continuously photographed by the web camera 21a and confirmed in real time. As a result, it is possible to confirm the state of displacement in the hopper 11 when the rotating lamp 2c is on or off, or to confirm whether any problem has occurred in the hopper 11 or the like.

Here, the primary crusher 2a realizes 400 t / h, for example, once every 40 seconds, and the secondary crusher 2b realizes, for example, 110 t / h, once every 145 seconds. For this purpose, it is necessary to input the primary crusher 2a once every 40 seconds, and the secondary crusher 2b once every 146 seconds. When converted into a processing time of 10 minutes, the primary crusher 2a has 15 times and two times. The next crusher 2b is charged four times. When the crusher 2 is thrown into the crusher 2 by one loading heavy machine 30, for example, when the primary crusher 2 a is F and the secondary crusher 2 b is S, the feeding method is FFFSFFFSFFFSFFFSFFF. At this time, a 4.5t / dose (= 3m ³ / dose) × 19 times = 85.5t / 10 min (approximately ^57m 3/10 min) = 513t / h (approximately the target value). According to the inventor's experiment, only one crusher (NT-500) having a higher processing capacity than the primary crusher 2a and the secondary crusher 2b of the present embodiment (the diameter of the discharged gap is 250 mm or less) is arranged. Compared to the case where the same treatment was performed, the transporting efficiency of the slip was improved by 27.5%.

  Next, when the work of transporting the gap around the face K2 of the tunnel T to the crusher 2 is finished, the covering material made of concrete or the like is sprayed on the inner wall surface of the tunnel T excavation site by two self-propelled heavy spraying machines. After that, a plurality of metal lock bolts are installed in a direction intersecting the inner wall surface of the tunnel T to reinforce the inner wall surface of the excavation site of the tunnel T (support work).

  Subsequently, after the support work in the tunnel T is completed, it is confirmed that there is no gap on the telescopic belt conveyor 3, and then the primary belt conveyor 3 a is moved (slid) toward the entrance of the tunnel T to be secondary. It arrange | positions so that it may overlap above the belt conveyor 3b, and the primary crusher 2a and the secondary crusher 2b are moved to the anti-mouth side.

  After that, the operation proceeds to the blasting operation of the next excavation cycle, and the same operation as described above is performed. And the tunnel T is formed in a natural ground by repeating the excavation work by the above blasting, and the conveyance work of a slack several times.

  (Second Embodiment)

  First, the structural example of the conveying apparatus which concerns on 2nd Embodiment is demonstrated with reference to FIG. FIG. 19 (a) is a plan view of the transport device according to the second embodiment, and FIG. 19 (b) is a side view of the transport device of FIG. 19 (a).

  In the transport device 1 according to the present embodiment, a stretch belt conveyor (second transport means) is connected to the rear stage of the secondary belt conveyor 3b of the above-described telescopic belt conveyor (first transport means) 3 via a tailpiece carriage 35. ) 40 are arranged in a column. Other configurations are the same as those in the first embodiment.

  The tailpiece carriage 35 is a relay conveying device that conveys the gap conveyed from the telescopic belt conveyor 3 (secondary belt conveyor 3b) to the stretching belt conveyor 40, and includes the telescopic belt conveyor 3 (secondary belt conveyor 3b) and the stretching belt. It is installed between the conveyor 40. The tailpiece carriage 35 includes a belt conveyor that conveys a gap, and also includes an endless track type moving device, and has a structure capable of self-propelling back and forth along the extending direction of the tunnel T.

  In addition, the tailpiece carriage 35 is connected to a support base capable of traveling at the tip of the stretch belt conveyor 40 by a rope (wire rope) or the like. If it advances forward, the front-end | tip part of the extending | stretching belt conveyor 40 will be the structure which can be extended toward the face K with it.

  The stretching belt conveyor 40 is a conveying device that conveys the gap conveyed from the telescopic belt conveyor 3 (secondary belt conveyor 3 b) via the tailpiece carriage 35 toward the tunnel T, and the rear end of the tailpiece carriage 35. It is installed in a state extending continuously from the tunnel to the tunnel T side of the tunnel T.

  A cassette 40a for storing a surplus belt (stretching belt) is installed at the rear end portion of the stretching belt conveyor 40, and the tailpiece carriage 35 is advanced toward the face K as the tunnel T is excavated. Along with this, the extra length belt is pulled out from the cassette 40a, and the conveying portion at the tip of the stretching belt conveyor 40 can be stretched toward the face K.

  Here, the case where the tail piece cart 35 is provided between the telescopic belt conveyor 3 (secondary belt conveyor 3b) and the stretching belt conveyor 40 has been described. However, the telescopic belt conveyor 3 (secondary belt without the tail piece cart 35 is provided). It is also possible to adopt a configuration in which the gap of the belt conveyor 3b) is directly conveyed to the stretching belt conveyor 40. In this case, in order to extend (move) the front end portion of the stretching belt conveyor 40 toward the face K, for example, a self-propelled carriage having no belt conveyor may be connected to the front end portion of the stretching belt conveyor 40. In addition, a self-propelled moving device may be incorporated at the front end of the stretching belt conveyor 40.

  Next, an example of a tunnel excavation method and a method for transporting a gap generated by excavation according to the present embodiment will be described with reference to FIGS. Although not particularly limited, the excavation method and the rock type are the same as those in the first embodiment, for example.

  First, FIG. 20A is a side view of the transport device in the tunnel during the blasting process in tunnel excavation work, and FIG. 20B is the transport in the tunnel after the blasting process in the tunnel excavation work following FIG. 20A. It is a side view of an apparatus.

  Here, as in the first embodiment, as shown in FIG. 20A, the crusher 2 and the elastic belt conveyor 3 are retracted to a position away from the face K1 by contracting the elastic belt conveyor 3. In the state, a blasting hole is formed in the face K1 of the tunnel T by a heavy machine or the like, an explosive such as dynamite is set in the blasting hole, and then the dynamite is blown (blasted), thereby FIG. As shown, the face K1 is excavated.

  A symbol Ls in FIG. 20A indicates a necessary retracting length between the face K1 of the tunnel T and the tip of the primary crusher 2a of the crusher 2 (tip of the transport device) at the time of blasting. For example, it is 40 m. By securing this retracted length Ls, the crusher 2 and the stretchable belt conveyor 3 can avoid the collision of the crushed material because the crushed material scattered by the blast does not reach, as in the first embodiment. it can. Therefore, damage and destruction of the crusher 2 and the telescopic belt conveyor 3 caused by the collision of the crushed material can be prevented. In addition, when the crusher 2 does not exist in the conveying apparatus 1 itself, the retracting length Ls is ensured by using the leading end portion of the stretching belt conveyor 3 as the leading end portion of the conveying apparatus.

  In addition, the symbol Me in FIG. 20B indicates the excavation length excavated by blasting. The excavation length Me is, for example, about 1.5 to 3 m, and the length may vary from one blast to another even within the same tunnel T depending on the geology of the natural ground, the state of blasting, and the like. Reference sign K2 indicates a new face formed by blasting.

  Then, Fig.21 (a) is a side view of the conveying apparatus in a tunnel in the preparatory stage of the gap conveying operation following FIG.20 (b).

  Here, as in the first embodiment, after the air in the tunnel T is ventilated, the self-propelled loading heavy machine 30 (see FIG. 12 and the like) for slack loading is moved to the face K2 of the tunnel T. At the same time, the telescopic belt conveyor 3 of the transport device 1 is extended toward the face K2. That is, the primary belt conveyor 3a of the crusher 2 and the telescopic belt conveyor 3 is moved toward the face K2. At this time, in the present embodiment, the advance length Ma in which the primary belt conveyor 3a of the crusher 2 and the telescopic belt conveyor 3 is advanced before and after the blasting is defined as a retracted length Ls−working space length Lw + excavation length Me. This will be described later.

  Note that the work space length Lw is a length necessary for performing various operations such as the transporting operation of the gap Za and is not particularly limited, but is, for example, 20 m. Further, when the crusher 2 and the primary belt conveyor 3a move forward, the secondary belt conveyor 3b, the tail piece carriage 35 and the stretching belt conveyor 40 of the telescopic belt conveyor 3 remain stopped.

  Then, FIG.21 (b) is a side view of the conveying apparatus in the tunnel in the slip conveyance work following FIG.21 (a).

  Here, similarly to the first embodiment, after driving the transporting device 1 (crusher 2, telescopic belt conveyor 3, tailpiece cart 35 and stretching belt conveyor 40) (starting crushing operation and transporting operation), The gap Za around the face K2 is thrown into the crusher 2 by the heavy equipment 30 for loading. Thereby, the slip Zc crushed by the crusher 2 is conveyed to the stretching belt conveyor 40 through the telescopic belt conveyor 3 and the tailpiece carriage 35 in order, and is conveyed to the tunnel T by the stretching belt conveyor 40. By crushing the gap Za with the crusher 2, it is possible to reduce the size of the telescopic belt conveyor 3, the tailpiece carriage 35, and the extension belt conveyor 40, and improve the conveyance efficiency of the gap.

  22A is a side view of the transport device in the tunnel immediately before the blast preparation process subsequent to FIG. 21B, and FIG. 22B is a crusher and an expansion and contraction in the blast preparation process subsequent to FIG. FIG. 23A is a side view of the transport device in the tunnel after the movement of the crusher and the telescopic belt conveyor is completed in the blast preparation process following FIG. 22B. FIG. 23 (b) is a side view of the transport device in the tunnel after completion of the movement of the stretch belt conveyor in the blast preparation process following FIG. 23 (a). 22A and 23A indicates the position of the leading end of the secondary belt conveyor 3b before movement, and P2 in FIG. 23B indicates the position of the stretch belt conveyor 40 before movement. The position of the tip is shown.

  Here, as shown in FIG. 22 (a), when the gap Zc disappears on the secondary belt conveyor 3b of the telescopic belt conveyor 3, as shown in FIG. 22 (b), the crusher is prepared for the next blast. 2 and the primary belt conveyor (first belt conveyor) 3a of the telescopic belt conveyor 3 are moved (retracted) in a direction away from the face K2.

  Here, in patent document 2 mentioned above, sufficient consideration is not made about the arrangement preparation of the conveyance apparatus before a blasting process, and the subject that the improvement of the excavation work efficiency of the whole tunnel is inhibited. is there. On the other hand, in the present embodiment, as shown in FIG. 23A, the retreat length Mb of the crusher 2 and the primary belt conveyor 3a is set to the retreat length Ls−the work space length Lw. As a result, the crusher 2 and the primary belt conveyor 3a reach a position shorter by the excavation length Me than the advance length Ma of the crusher 2 and the like described with reference to FIG. 21A (retraction length Ls−working space length Lw + excavation length Me). While being able to retreat, the front-end | tip part of the primary crusher 2a of the crusher 2 can be retreated to the position away from the face K2 by the retracting length Ls. That is, the crusher 2 and the primary belt conveyor 3a are moved back in a state where the actual excavation length Me is added to the retracting length Ls and the working space length Lw, so that the crusher 2 and the primary belt conveyor 3a are more appropriately positioned (large excess or shortage). Can be moved back to a position where no occurrence occurs. Therefore, since the crusher 2 and the primary belt conveyor 3a can be moved efficiently, the arrangement preparation time of each apparatus of the conveying apparatus 1 can be shortened, and the excavation work efficiency of a tunnel can be improved.

  Further, in the present embodiment, as shown in FIG. 22B, the secondary belt conveyor (second belt conveyor) of the telescopic belt conveyor 3 simultaneously with the retreating operation of the crusher 2 and the primary belt conveyor 3a. 3b is moved in the direction approaching the face K2, and the secondary belt conveyor 3b is advanced by the excavation length Me as shown in FIG.

  Further, as shown in FIG. 23 (b), the tail piece carriage 35 is advanced at the stage where the gap Zc is removed from the extension belt conveyor 40, and the rear end portion of the extension belt conveyor 40 is moved forward by the tail piece carriage 35. The extra belt is fed out from the cassette 40a, and the leading end of the stretching belt conveyor 40 is stretched toward the face K2 by the excavation length Me.

  In addition, although the case where the extending | stretching operation | movement of the extending | stretching belt conveyor 40 by advancing of the tailpiece carriage 35 was illustrated after advancing the secondary belt conveyor 3b of the expansion-contraction belt conveyor 3 here, it is not limited to this For example, if there is no gap Zc on the stretching belt conveyor 40, the stretching operation of the stretching belt conveyor 40 can be performed by advancing the tail piece carriage 35 simultaneously with the advancement of the secondary belt conveyor 3 b. .

  Here, in the above-mentioned Patent Document 2, in preparation for the next blast, the crusher and the Belcon cart are not moved after the crusher and the Belcon cart are moved backward from the face and the conveyor belt is completely returned to the belt storage of the backup deck. It is not possible to move forward by the amount of excavation due to the previous blasting, and if the forward movement operation is not finished, the subsequent drawing belt conveyor cannot start the drawing operation. In other words, the crusher and the Belcon cart must be returned to the position before stretching, and the stretching operation of the stretching belt conveyor is restricted by the operation of the Belcon cart and the backup deck, which hinders the improvement of tunnel excavation work efficiency. There is a problem of being.

  On the other hand, in the present embodiment, the stretchable belt conveyor 3 is divided into a primary belt conveyor 3a and a secondary belt conveyor 3b that can independently run independently from each other. The transport device 1 can be operated independently on the side (upstream side of transport) and the anti-mouth side (downstream side of transport).

  For this reason, for example, as described above, the retreat length Mb of the crusher 2 and the primary belt conveyor 3a for blasting preparation can be made shorter than the advance length Ma of the crusher 2 and the primary belt conveyor 3a. , Can shorten the preparation time for the next blast. For example, as described above, the secondary belt conveyor 3b can be moved forward simultaneously with the retracting operation of the crusher 2 and the primary belt conveyor 3a. If there is no gap Zc on the belt conveyor of the stretching belt conveyor 40, the stretching operation of the stretching belt conveyor 40 can be started without waiting for the primary belt conveyor 3a to be retracted. As a result, it is possible to shorten the time for preparing the arrangement of the transporting device for each blasting, so the excavation work efficiency of the tunnel T can be improved. Therefore, the excavation work period of the tunnel T can be shortened, and the construction cost can be reduced.

  Subsequently, as shown in FIG. 22 (b), the crusher 2 and the primary belt conveyor 3a are moved backward, and at the same time, a self-propelled spraying heavy machine or the like for supporting work is directed to the front face K2, and FIG. As shown to (a), the coating | covering material which consists of concrete etc. is applied to the inner wall surface of the excavation location of the tunnel T, with the front-end | tip part of the primary crusher 2a of the crusher 2 retracted from the face K2 by the retracting length Ls. After spraying, etc., a plurality of metal lock bolts are installed in a direction intersecting the inner wall surface of the tunnel T to reinforce the inner wall surface of the excavation site of the tunnel T (support work). This support work should be carried out when the work space length Lw shown in FIG. 22A is secured (before the crusher 2 or the like is retracted and when the gap Za disappears around the face K2). However, as shown in FIG. 23 (a), a sufficient distance (retraction length Ls) is secured between the face K2 of the tunnel T and the primary crusher 2a of the crusher 2 for carrying out the supporting work. The workability of the support work can be improved by carrying out the work in the above state.

  Next, FIG. 24 (a) is a side view of the transport device in the tunnel at the time of the blasting process in the tunnel excavation work following FIG. 23 (b), and FIG. 24 (b) is the slip transport work following FIG. 24 (a). It is a side view of the conveying apparatus in a tunnel in a preparation stage.

  Here, in the same manner as described above, the face K2 of the tunnel T is excavated by blasting in a state where the crusher 2 and the stretchable belt conveyor 3 are retracted to a position away from the face K2 by contracting the elastic belt conveyor 3.

  Subsequently, as shown in FIG. 24 (b), after the air in the tunnel T is ventilated, the self-propelled loading heavy machine 30 (see FIG. While moving to the face K3, the crusher 2 of the conveying device 1 and the primary belt conveyor 3a of the telescopic belt conveyor 3 are advanced toward the face K2 by the advance length Ma.

  Here, as described above, in Patent Document 2, sufficient consideration is not given to the arrangement preparation of the transportation device after the blasting process, and improvement of the overall excavation work efficiency of the tunnel is hindered. There is a problem. On the other hand, in the present embodiment, as described above, the advance length Ma of the crusher 2 and the primary belt conveyor 3a is set as the retreat length Ls−the working space length Lw + the excavation length Me. As a result, the crusher 2 and the primary belt conveyor 3a can advance to a position longer by the excavation length Me than the retreat length Mb of the crusher 2 and the like described with reference to FIG. 23 (a) (retraction length Ls−working space length Lw). In addition, the tip of the primary crusher 2a of the crusher 2 can be stopped at a position separated from the face K3 by the working space length Lw. That is, the crusher 2 and the primary belt conveyor 3a are moved forward in a state where the actual excavation length Me is added to the retracted length Ls and the working space length Lw, so that the crusher 2 and the primary belt conveyor 3a are moved to more appropriate positions (large excess or deficiency). Can be advanced to a position where no occurrence occurs. Therefore, since the crusher 2 and the primary belt conveyor 3a can be moved efficiently, the arrangement preparation time of each apparatus of the conveying apparatus 1 can be shortened, and the excavation work efficiency of a tunnel can be improved.

  The tunnel T is formed in the natural ground by repeating a series of processes such as the blasting process, the expansion / contraction (moving device movement) process, the support work process, and the shearing transport process a plurality of times.

  As mentioned above, the invention made by the present inventor has been specifically described based on the embodiment. However, the embodiment disclosed in this specification is an example in all respects and is limited to the disclosed technology. It is not a thing. That is, the technical scope of the present invention should not be construed restrictively based on the description in the above-described embodiment, but should be construed according to the description of the scope of claims. All modifications are included without departing from the technical scope equivalent to the described technique and the gist of the claims.

  For example, instead of the telescopic belt conveyor, a rail may be laid on the ground in the tunnel, and the conveyor may be moved along the rail.

  Further, for example, a carriage may be interposed between the secondary crusher and the telescopic belt conveyor. This cart is a self-propelled relay transporting means that transports the scraps crushed by the secondary crusher to the telescopic belt conveyor.

  In the above description, the case where the blasting method is used as the tunnel excavation method has been described.

  Moreover, the crusher may be equipped with a crusher of tertiary (unit) or higher. In this case as well, third-order (units) or higher crushers can independently run (move). Further, the telescopic belt conveyor may also be provided with a tertiary (or more) belt conveyor. In this case as well, tertiary (or higher) belt conveyors can independently run (move).

As described above, Kezukata method digging engagement belt tunnel to the present invention is effectively applied to the drilling method of the tunnel with a step of conveying the excavated material resulting from the excavation of natural ground in pit outside the tunnel .

DESCRIPTION OF SYMBOLS 1 Conveying device 2 Crusher 2a Primary crusher 2b Secondary crusher 3 Telescopic belt conveyor 3a Primary belt conveyor 3b Secondary belt conveyor 4a, 4b Traveling part 5a, 5b Slipping input part 6a, 6b Slurry crushing part 7a, 7b Belt conveyor part 10 Feeder 11 Hopper 13a Fixed tooth plate 13b Moving tooth plate 14 Swing jaw 14a Support shaft 15 Crushing chamber 16 Toggle plate 20 Detection device 20a Sensor 20b Program relay circuit 20c Rotating light 21 Monitoring device 21a Web camera 21b Recorder 21c Hub 21d Personal computer 21e Monitor 30 Loading heavy machine 35 Tailpiece truck 40 Stretch belt conveyor 40a Cassette T Tunnels K, K1, K2 Face Ls Retraction length Lw Work space length Me Excavation length Ma Advance length Mb Retreat length

Claims (6)

(A) In a state where the front end portion of the transporting device having the first transporting means and the second transporting means arranged in series along the direction from the face of the tunnel toward the wellhead is separated from the face by a retracted length, Excavating the face; and
(B) After the step (a), among the plurality of belt conveyors of the first transporting means, one or a plurality of first belt conveyors on the upstream side of transporting the excavated material are disposed after the step (a). Extending the first conveying means to a position where the tip of the conveying device is separated from the working face after the step (a) by a working space length by advancing toward the working face;
(C) After the step (b), the step of transporting the excavated material generated in the step (a) toward the wellhead by the transporting device;
(D) In the step (c), when the excavated material is transported by the first transporting means, the first belt conveyor is moved backward toward the wellhead, thereby leading the tip of the transporting device. Shrinking the first conveying means to a position where the part is separated from the face after the step (a) by the retracted length; and
(E) Simultaneously with the step (d), among the plurality of belt conveyors of the first transporting means, after the step (a) The process of moving forward toward the face of
(F) After the transport of the excavated material by the second transport means is finished, the second belt conveyor is advanced after the step (e) or simultaneously with the advance of the second belt conveyor in the step (e). Extending the tip of the conveying means toward the face after the step (a),
Kezukata method drilling of features and to belt tunnel that repeated. In the step (b), the advance length of the first belt conveyor is Ls−Lw + Me, where the retracted length is Ls, the working space length is Lw, and the excavation length in the step (a) is Me.
In the step (d), the receding length of the first belt conveyor is Ls-Lw,
In the step (e), the advance length of the second belt conveyor is the excavation length,
In step (f), stretching the length of the second conveying means, Kezukata method drilling of claim 1, wherein the tunnel, characterized in Rukoto set to the drilling length. Even after the step (d) prior to step (a), drilling the tunnel of claim 1, wherein further comprising a step of performing a支保Engineering in the working face near the tunnel Kezukata method. The step (c)
(C1) a step of crushing the excavated material generated by the step (a) by a self-propelled crushing means disposed between the face and the first transport means;
(C2) a step of conveying the excavated material crushed in the step (c1) through the first conveying means and the second conveying means in order;
The tunnel excavation method according to claim 1, wherein the tunnel excavation method is provided. 5. The tunnel excavation according to claim 4, wherein, in the step (c1), the excavated material is crushed by a plurality of the self-propelled crushing means arranged in tandem along the extending direction of the tunnel. Method. The step of excavating the face of the step (a)
  (A) forming a blast hole in the face before the step;
  Placing an explosive in the blast hole;
  A step of excavating the face before the step (a) by detonating the explosive;
  The tunnel excavation method according to claim 1, wherein the tunnel excavation method is provided.

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