JP2018178638A - Export arrangement of sediment crushed stone generated in tunnel construction - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a belt conveyer arranged within a long tunnel for successively exporting sediment and crushed stone generated from a pit face of a tunnel construction to reduce a number of large truck for moving a tip of a conveyor belt forward along with a forward movement of the face pit to reduce a facility cost while constructing a belt receiving roller on a tunnel concrete wall surface already drilled and to perform a mobile work and a construction work of the belt receiving roller on the concrete wall effectively.SOLUTION: A conveyor belt 1 is folded in the middle to be stored, the conveyor belt 1 stored is dispensed along with a forward movement of a pit face position, a front part of a tail piece truck 3 having a belt return vehicle of its tip is inclined, a receiving roller 3c is arranged on its front inclined surface 3b, and a conveyor belt lifting device 3d for lifting a belt to a middle and rear part of the tail piece truck 3, a gib crane device 3e for lifting a machinery and a work bench 3f are provided.SELECTED DRAWING: Figure 1

Description

  The present invention continuously carries out long-distance continuous transportation of crushed stone which has been crushed by sand, crushed stone and crusher car generated by blasting of the face in tunnel construction and the like from small rock to a predetermined place in the tunnel by belt conveyor from the face. The present invention relates to an unloading facility using a long conveyor belt for

A lot of earth and sand, fragments and large rocks are generated near the face by blasting work or excavation work at the face of tunnel construction. The front of the tailpiece carriage attached with the return part of the conveyor belt tip of the belt conveyor equipment placed behind after the soil and fragmented pieces are broken by the shovel car and the big rock by the crusher car Patent Document 1 discloses a belt conveyor device which is placed on the input portion of the conveyor belt and is transported long in a tunnel. The problem of the conveyor device developed in Patent Document 1 is that the tailpiece carriage causes the tailpiece carriage to go back and forth at every blast in order to avoid blasting. Further, on the tailpiece carriage, receiving rollers for receiving the conveyor belt are arranged at regular intervals.
As the tailpiece carriage is moved forward and backward, each frame of the rear telescopic frame unit is unfolded to be able to support the conveyor belt. However, this solves the back and forth movement of the tailpiece carriage before and after blasting. However, the invention of Patent Document 1 can not sufficiently cope with the movement of the face position forward. When the face moves forward and the tunnel lengthens, the belt conveyor of the belt conveyor system sequentially mounts the belt receiving roller for receiving the conveyor belt on the concrete wall surface of the existing tunnel excavated and its supporting member at predetermined intervals, and conveys the belt of the conveyor belt Were placed on the belt receiving roller provided at regular intervals along the concrete wall, and the conveyor belt was placed on this to enable long transport.

In the construction of a long tunnel, the applicant has developed a conveyor system for continuously delivering soil and crushed stone generated from the face. This equipment, as shown in FIGS. 15 and 16, stores the belt washing device 4 of a long belt conveyor, the main drive for feeding and driving the conveyor belt 1 of the belt conveyor, the belt winding device, and folds the conveyor belt and stores it. Storage cassette, a catenary carriage KD that can be moved by a crawler that lifts the conveyor belt to a predetermined height with inclined belt receiving rollers, and a return car at the end of the conveyor belt 1 at the front end, crushing from the crusher car CR in the front of the belt A tailpiece truck TD that has a loading section for loading soil, fragments, pebbles, etc. from a shovel car SH that collects soil, fragments, pebbles, etc. of crushed stone or face K, and can move crawlers and its front Is a facility in which a crusher car CR and a shovel car SH are disposed.
A catenary cart KD as long as about 20 m and a tailpiece car TD as long as about 12 m can be moved by a crawler. The catenary carriage KD supports the conveyor belt by free rollers in the forward inclined portion. When moving the catenary carriage KD, the conveyor belt had to be advanced slightly off the free roller. Then, in the tailpiece truck TD located at the front, the installation preparation work of the wire suspension support member for supporting the conveyor belt on the tunnel wall is performed.

In the unloading facility in front of the applicant, when the face moves forward, the crusher car CR, the shovel car SH and the tailpiece car TD are moved about 3 m, and then the catenary car KD is moved. At this time, the conveyor belt had to be lifted and moved. Further, the catenary carriage KD is moved by a crawler and performs mounting / assembly work of a horizontal member / side frame and a belt receiving roller for receiving the belt to be supported by the tunnel wall surface of the conveyor belt at the stopping position. After that, the conveyor belt which was being lifted was placed on the belt receiving roller on which the conveyor belt was mounted. Thus, at the applicant's previous unloading facility, a long, large tailpiece truck and a catenary truck had to be placed near the face. It has a large space near the face, which has been a hindrance to other vehicles and movements. Furthermore, the movement of the tailpiece carriage and the catenary carriage requires a large number of workers, and the movement operation takes time and time. In addition, the tunnel wall mounting preparation operation of the support member in the tailpiece carriage and the mounting assembly operation of the belt receiving roller in the catenary carriage are required, and thereafter, there is an operation of mounting the conveyor belt on the belt receiving roller In order to move about 3 m along with the advancement of the face, it was necessary to move two large carriages, the tailpiece carriage and the catenary carriage.
In addition, large catenary carts and tailpiece carts are required, which increases the equipment cost, and there are also many operations for forward movement, resulting in a large number of man-hours and an increase in the cost.

Unexamined-Japanese-Patent No. 2014-28670

  The problem to be solved by the present invention is to solve the conventional problems and carry out the mounting operation of the support member and the installation operation of the belt receiving roller by one tail piece carriage, and the conveyor belt can be quickly at a new position. The present invention provides a discharge facility for earth and sand crushing stone generated in a tunnel construction which is operable at low cost and has excellent workability.

The configuration of the present invention that solves the problem is:
1) This method is to load crushed stone or crushed stone generated from the face of a tunnel work or a large rock crushed by a crusher work vehicle by a crusher near the face and carry it out by a long conveyor belt. The return part of this is provided at the tip of the movable tailpiece carriage, and the conveyor belt folds back and stores the belt of extra length halfway, and draws out and extends the stored belt along with the movement of the tailpiece carriage in the face direction While making it possible, the conveyor belt successively mounts the support member of the conveyor belt at the upper wall position of the concrete wall of the existing tunnel, attaches the belt reception roller of the conveyor belt to the support member, and holds the belt reception roller in the middle of the conveyor belt In the unloading facility, which carries out intermediate support and carries out earth and sand crushing stone generated in tunnel construction,
A plurality of conveyor belt receiving rollers are arranged at the front and center of the tailpiece carriage so that they are lowered toward the return car at the tip, and the conveyor belt rests on the receiving rollers and returns in an anteversion state A conveyor belt lift device that is configured to be suspended on a car, and can be suspended to a position lower than a tensioned position where the conveyor belt stretched in the rear upper part of the tailpiece carriage is raised and transported high by a plurality of free rollers. ,
A jib crane device capable of lifting a member such as the belt receiving roller carried to the face site from the central side surface of the tunnel and turning and moving it to the rear part of the tailpiece carriage;
A plurality of support members, one end of which is fixed to a concrete wall at the lower position of the conveyor belt, can be horizontally installed with a suspension wire at a lower position of the conveyor belt while the conveyor belt is suspended high by the conveyor belt lift device A long work scaffolding capable of working to build up the belt support roller on the concrete wall at a predetermined interval is provided at the rear of the tailpiece carriage, and the tailpiece carriage is advanced by a predetermined distance in the face direction Earth and sand generated during tunnel construction, characterized by the fact that a new belt receiving roller in front of the conveyor belt can be quickly attached to the concrete wall in the work scaffolding operation at the stop position and the conveyor belt transport operation can be resumed quickly. It is in the unloading facility of crushed stone.

  In the present invention, the support member 10 and the suspension wire 10c are suspended by the support member 10 after the concrete anchor 10a and the suspension fitting 10b are attached above the concrete wall TW by another working lift vehicle or the like which precedes Attach one end beforehand with 10c. Since this pre-work is a work in front of the tail piece carriage 3 and can be performed in parallel with the operation of the conveyor belt 1, the work time is not extended.

Next, when the face K is forward, the tailpiece truck 3 and the crusher car CR, the shovel car SH, etc. are moved about 3 m. When moving the tailpiece carriage 3, the tailpiece carriage 3 is provided with the conveyor belt portion at the highest position of the rear end of the forwardly inclined tailpiece of the tailpiece carriage 3 while partially delivering the folded back conveyor belt 1. It lifts with a plurality of free rollers 3d ₂ of the conveyor belt lift 3d. As a result, the conveyor belt 1 is not in contact with the receiving roller 3c at the front of the tailpiece truck TD, and even when the tailpiece truck 3 is advanced, the contact resistance between the conveyor belt 1 and the receiving roller 3c is large. As a result, the tailpiece truck TD can be moved smoothly. Then, the tailpiece truck TD is stopped at a position advanced by about 3 m, and at this position, a wire is first placed above the concrete wall TW below the conveyor belt 1 lifted by the operator on the work table 3f above the rear. The support member 10 attached in the above is installed horizontally by the suspension wire 10c, the suspension bracket 10b, the bracket 10e and the like. Moreover, the horizontal installation work of the support member 10 can be easily performed because the conveyor belt 1 is lifted upward.

  Thereafter, using the jib crane device 3e, the belt receiving roller 12 carried to the side of the tunnel center side of the tailpiece carriage 3 and the members necessary for mounting are lifted, turned about 90 °, and rotated on the horizontal support member 10. Attach to In this work, the operator utilizes the vertical movement by the jib crane device 3e on the work bench 3f above the rear of the tailpiece carriage 3 and, if necessary, using an auxiliary device such as a partial lift and roller slide stand. A plurality of belt receiving rollers 12 are fixed on a plurality of horizontal support members 10.

  After the belt receiving roller 12 is installed, the conveyor belt lifting device 3d is operated to place the conveyor belt 1 on the fixed belt receiving roller 12, and then the conveyor belt 1 is operated. The earth and sand crushing stone etc. are transferred on the conveyor belt 1 from the input part 1b of the front part of the tailpiece truck 3 using the crusher car CR and the shovel work car SH. Earth and sand crushing stones scattered near the face K are collected by the shovel work vehicle SH, and large rocks are broken into small pieces by the crusher vehicle CR and transferred onto the tip of the conveyor belt 1. Moreover, between the rear end of the tailpiece carriage 3 and the belt receiving roller 12 on the existing support member 10 of the concrete wall surface, a new supporting member 10 attached at the rear of the tailpiece carriage 3 and the belt receiving roller 12 are provided. Since the conveyor belt 1 can be stably supported without a gap, the soil, crushed stone, etc. on the conveyor belt 1 can be transported backward without any problem.

Thus, according to the present invention, the conveyor belt 1 can be stretched by only one tail piece carriage 3 and the support member 10 and the belt support at the rear of the tail piece carriage 3 at its single forward and forward positions. Since the installation work of the rollers 12 can be performed, if the conveyor belt 1 is lowered by the conveyor belt lift device 3 d after the work is completed, the conveyor belt 1 is supported by the new belt receiving roller 12 and put into the transfer work. The extension can be done efficiently and the workability is good.
In this manner, the tailpiece carriage 3 is advanced along with the advancement of the face position, and the horizontal support member 10 is installed at the upper rear of the tailpiece carriage 3 and the belt receiving roller 12 is assembled thereon. The operation can be done efficiently.

FIG. 1 is an explanatory view of the arrangement of devices in a tunnel according to an embodiment of the present invention. FIG. 2 is a front view of the tail piece carriage of the embodiment. FIG. 3 is a left side view of the tail piece carriage of the embodiment. FIG. 4 is a plan view of the tail piece carriage of the embodiment. FIG. 5: is explanatory drawing which shows the attachment state of the supporting member and belt receiving roller which were attached to the existing concrete wall of an Example. FIG. 6 is an explanatory view showing the position of the conveying state of the conveyor belt of the embodiment. FIG. 7 is a view on arrow XX in FIG. FIG. 8 is an explanatory view of a state in which the conveyor belt is lifted by the conveyor belt lift device. FIG. 9 is a view taken in the direction of arrows YY in FIG. FIG. 10 is an explanatory view showing the mounting state of the belt receiving roller above the workbench of the tailpiece carriage. FIG. 11 is a plan view showing the arrangement of the side frame attached to the horizontal member and the belt receiving roller fixed thereon. FIG. 12 is a front view showing the arrangement of FIG. FIG. 13 is a cross-sectional view taken along line B-B of FIG. FIG. 14 is a cross-sectional view taken along the line C-C in FIG. FIG. 15 is an explanatory view showing a device layout of a conventional unloading equipment for earth and sand crushed stone. FIG. 16 is a structural explanatory view of the conventional catenary cart, tailpiece cart and crusher car in FIG.

The conveyor belt lifting device 3d is a device that enables lifting of a plurality of horizontal free rollers 3d ₂ that receive the conveyor at the front and rear with a winch 3d _{3. When} the conveyor belt 1 is operated, the suspended free rollers 3d ₂ are conveyor belts Position 1 below. When the support members 10 and the like are horizontally installed, the conveyor belt 1 can be lifted high by simultaneously pulling up the suspension free roller 3d ₂ using the winch 3d ₃ . Not only the winch but also a cylinder can be used to lift it upward.

  The jib crane device 3e according to the present invention lifts members such as the support member 10 and the belt support member higher than the position of the work bench 3f of the tailpiece carriage 3 and not only the jib crane device 3e but also a usual crane device or near the tunnel ground. Or by a lifting robot arm attached to the tailpiece carriage.

The embodiment shown in FIGS. 1 to 14 will be described below based on the drawings.
In the figure, T is a tunnel, TW is a concrete wall of a tunnel of an existing part excavated and cast, K is a face, and G is a discharge equipment of sediment crushing stone generated in the tunnel construction of the embodiment (hereinafter simply referred to as discharge equipment) CR) can travel on the crawler CR3 and crush large rocks etc. and discharge it to the conveyor belt 1 of the unloading facility by the inclined conveyor CR1 at the rear, SH is a conveyor of the unloading facility G by collecting sediment and crushed stone The shovel car transferred to the front of the belt 1 and LC are high-level work lift cars for attaching a support member to the concrete wall TW.
In the figure, 1 to 13 are components of the unloading equipment G, 1 is a long conveyor belt supported by rollers, 1a is a return car at the end of the conveyor belt 1, and the end of the tailpiece carriage 3 Is attached to Reference numeral 1 b denotes a feeding portion of earth and sand crushing stone at the tip of the conveyor belt 1. Reference numeral 2 denotes a belt return storage unit comprising a large number of movable storage cassettes 2a provided in the middle of the conveyor belt 1 for folding back and storing the belt, and rollers 2b for receiving the conveyor belt 1 are attached above each storage cassette. The storage cassette 2a can be fed one by one to extend the conveyor belt 1 forward. This structure is used as shown in FIG. A tailpiece carriage 3 having a tip return car 1a of the conveyor belt 1 can travel forward and backward by the crawler 3a, and the belt receiving roller 3c can be fixed along the front inclined surface 3b receiving the conveyor belt 1 inclined forward. It is provided at intervals. A conveyor belt lift device 3d is provided above the rear of the tailpiece carriage 3. A plurality of free rollers 3d ₂ supporting the conveyor belt 1 from below are suspended by a plurality of winches 3d ₃ vertically moving on a portal frame 3d ₁ . Reference numeral 3e is a jib crane device, in which parts and members such as the belt receiving roller 12, the side frame 11, and its mounting members carried into the tunnel T are suspended from below the side surface facing the center of the tunnel and turned to a tailpiece Attached to the rear of the dolly 3 by a winch 3e _{3 so} that it can traverse along the horizontal arm 3e ₂ of the main pillar 3e ₁ provided at the rear of the tailpiece dolly 3 and can be pivoted around the main pillar 3e ₁ A plurality of lifting winches 3e ₃ are attached to the horizontal arm 3e ₂ . 3f is a workbench for installing the belt receiving roller 12 lifted by the conveyor belt lifting device 3d and the jib crane device 3e and the side frame 11 on the horizontal support member 10, and 3g is an outrigger of the tailpiece carriage 3. 4 is a belt washing apparatus provided at the return portion of the rear end of the conveyor belt 1, 5 is a belt winding apparatus of the conveyor belt 1, 6 is a main drive of the conveyor belt 1, and 10 is a tunnel for holding the conveyor belt 1. A support member attached to the concrete wall TW of T, 10a is a concrete anchor to be installed on the concrete wall TW, 10b is a hanging bracket for connecting the concrete anchor and the supporting member 10, and 10c is a connection between the hanging bracket and the supporting member 10 A hanging wire 10d is an anchor placed on a concrete wall for attaching the other end of the support member 10, and 10e is a metal fitting for connecting the anchor and the other end of the support member 10. 11 is a side frame connecting a plurality of support members 10 horizontally supported by a suspending wire 10c etc. 12 is a belt receiving roller fixed on the side frame 13 is a small lifter disposed near the work table 3f It is a free roller for transverse feeding of members.

(Description of operation of the embodiment)
Around the face K of the tunnel construction, sand, crushed stone and large rocks generated by blasting of dynamite or excavated by an excavator (not shown) are generated. The earth and sand and crushed stone are recovered by the shovel car SH, and are introduced into the earth and sand crushed stone input portion 1 b of the conveyor belt 1 provided at the tip of the tailpiece carriage 3. A large rock is introduced into a crusher and broken into small pieces, and then introduced from the inclined conveyor CR1 at the rear to the earth-shredded stone input part 1b of the conveyor belt 1 of the tailpiece carriage 3.

  When earth and sand and crushed stone loaded from the loading portion 1b of the conveyor belt 1 of the tailpiece truck 3 are placed on the conveyor belt 1, along the receiving roller 3c of the forward inclined surface 3b of the tailpiece truck 3, Sent to climb towards the top. The support member 10 is horizontally held by the suspension bracket 10b of the upper anchor 10a, the lower anchor 10d, the bracket 10e, and the suspension wire 10c which are placed on the concrete wall TW at the rear of the tailpiece truck 3. A side frame 11 is constructed on a member 10, and a belt receiving roller 12 in which a plurality of free rollers 13 are combined is attached to the side frame 11. The forward path of the conveyor belt 1 is placed above the plurality of belt receiving rollers 12 and fed rearward. The tail piece carriage 3 is supported by the belt receiving roller 12 held by the existing support member 10 and the side frame 11 on the concrete wall TW from the rear of the tail piece carriage 3, and the rear belt folding storage portion 2-belt washing device 4-belt winding It is sent to the device 5. The earth and sand crushing stone on the conveyor belt 1 is transferred from a predetermined place on the rear side to the next conveying device (not shown).

When the position of the face K advances (about 3 m), the shovel car SH and the crusher car CR are also moved. The tailpiece carriage 3 is also advanced forward by the same distance, but before moving the belt receiving roller 12, the conveyor belt 1 on the receiving roller 3c is moved by a plurality of free rollers 3d ₂ by the winch 3d ₃ of the conveyor belt lifting device 3d. By lifting, the conveyor belt 1 is lifted from the belt receiving roller 12 and the receiving roller 3c of the forward inclined surface 3b. In this state, even if the tailpiece carriage 3 is advanced by the crawler 3a, the conveyor belt 1 can be moved easily with less resistance to advancement only by applying tension to the return car 1a at the tip of the tailpiece carriage 3. The necessary number of storage cassettes 2a are advanced from the belt return storage 2 by the movement of the tailpiece carriage 3, and the conveyor belt 1 can be extended forward with belt receiving rollers above it.

  The belt receiving roller 12 is not yet installed and does not exist on the concrete wall TW next to the rear of the tailpiece carriage 3 that has been moved. Therefore, the conveyor belt 1 in which the worker lifts the support member 10 which is suspended by the suspension wire 10c on the suspension bracket 10b of the concrete wall TW on the work platform 3f of the rear portion of the tailpiece carriage 3 The lower end of the support member 10 is connected to the metal fitting 10e of the lower anchor 10d to hold the support member 10 horizontally below the conveyor belt 1 (see FIGS. 8, 9 and 10).

Next, the side frames 11 are installed along the walls on the plurality of support members 10 held horizontally (see FIGS. 10 and 11). Further, a belt receiving roller 12 in which a plurality of free rollers 13 are combined is fixed on the side frame 11 by a bolt and nut or the like. The members and tools necessary for mounting the side frame 11 and the belt support roller 12 are carried to the bed of the ground vehicle near the side of the tailpiece truck 3 where the vehicle can pass on the center side of the tunnel. The horizontal arm 3e ₂ of the jib crane device 3e installed on the tailpiece carriage 3 is turned in the side direction, and the side frame 11 and the belt receiving roller 12 are lifted using the winch 3e ₃ , and 90 ° upward It is pivoted to move onto the work platform 3f of the tailpiece carriage 3, and the side frame 11 and the belt receiving roller 12 are assembled on the support member 10 which has been made horizontal first.

As described above, after a plurality of belt receiving rollers 12 are attached at a constant interval, the belt receiving roller 12 in which the conveyor belt 1 on the free roller 3 d ₂ is installed by lowering the lifting tool with the winch 3 d ₃ of the conveyor belt lifting device 3 d. Put on the top. In this manner, when the conveyor belt 1 is fed on the conveyor belt 1 with the conveyor belt 1 placed on the receiving roller 3c of the front inclined surface 3b of the tailpiece carriage 3 and the belt receiving roller 12 at the rear, The sediment crush stone can be transported backward.

  In parallel with the mounting work of the support member 10, the side frame 11, and the belt receiving roller 12 at the rear of the tailpiece truck 3, the concrete anchor 10a of the support member 10 is used in front of the tailpiece truck 3 The mounting operation of the support member 10 using the casting work suspension bracket 10b and the suspension wire 10c, the casting of the lower anchor 10d and the work of attaching the bracket 10e thereto are performed. The mounting operation time can be shortened by carrying out the mounting operation of the rear part of the tailpiece carriage 3 and the mounting operation of the support member 10 in front of and in parallel and simultaneously.

  After the transportation of the earth and sand and crushed stone at this position of the tailpiece carriage 3 is finished, the face K is moved forward. After that, by repeating the mounting operation and the unloading operation for each forward movement of about 3 m in the same manner as described above, the earth and sand crushing stone from the face can be efficiently transported to the outside.

  As the previous equipment of the present applicant, it is not necessary to extend the conveyor belt to a large 23 m long catenary cart KD and a 13 m tail piece cart TD, and the catenary cart KD and the tail piece cart TD There is also no need for sequential movement of each truck. Therefore, the present invention does not require two carriages, and the conveyor belt can be extended with only one tail piece carriage 3, and the installation space of the carriages in the tunnel T is reduced, and the carriage movement time and two There is no need for mounting members using carriages, only one piece of tailpiece carriage 3 needs to be moved and installed, and a conveyor belt that transports earth and sand crushing stones for tunnel construction can be extended very efficiently, and its workability is good. It was possible.

  The present invention can be used not only for long tunnel construction but also for unloading earth and sand crushing stones for medium distance tunnel construction.

T tunnel TW concrete wall K face G unloading equipment CR crusher car CR1 inclined conveyor SH shovel car KD conventional catenary cart TD conventional tailpiece cart 1 conveyor belt 1a return car 1b return car 1b conveyor belt 1 sediment Crushed stone feeding part 2 Belt folding storage part 2a Storage cassette 2b Roller 3 Tail piece cart 3a Crawler 3b Front inclined surface 3c Receiving roller 3d Conveyor belt lift device 3d ₁ framed frame 3d ₂ free roller 3d ₃ winch 3e jib crane device 3e ₁ the primary posts 3e ₂ horizontal arm 3e ₃ lifting winch 3f worktable 3g outrigger 4 belt washing device 5 belt take-up device 10 the support member 10a concrete anchor 10b hanging bracket 10c hanging Wye 10d anchor 10e fitting 11 side frame 12 belt-receiving rollers 13 free rollers

Claims (1)

Crushed stone or crushed stone generated from the face of a tunnel construction or crushed stone crushed by a crusher work vehicle is placed near the face and carried out by a long conveyor belt, the return of the tip of the conveyor belt And the conveyor belt is capable of folding back and storing an extra length of belt along the way so that the stored belt can be fed out and stretched along with the movement of the tailpiece car in the face direction At the same time, the conveyor belt successively mounts the support member of the conveyor belt at the upper wall position of the concrete wall of the existing tunnel, attaches the belt receiving roller of the conveyor belt to the same support member, and intermediates the conveyor belt between the belt receiving rollers. In the unloading facility to support and carry out earth and sand crushing stone generated by tunnel construction,
A plurality of conveyor belt receiving rollers are arranged at the front and center of the tailpiece carriage so that they are lowered toward the return car at the tip, and the conveyor belt rests on the receiving rollers and returns in an anteversion state A conveyor belt lift device that is configured to be suspended on a car, and can be suspended to a position lower than a tensioned position where the conveyor belt stretched in the rear upper part of the tailpiece carriage is raised and transported high by a plurality of free rollers. ,
A jib crane device capable of lifting a member such as the belt receiving roller carried to the face site from the central side surface of the tunnel and turning and moving it to the rear part of the tailpiece carriage;
A plurality of support members, one end of which is fixed to a concrete wall at the lower position of the conveyor belt, can be horizontally installed with a suspension wire at a lower position of the conveyor belt while the conveyor belt is suspended high by the conveyor belt lift device A long work scaffolding capable of working to build up the belt support roller on the concrete wall at a predetermined interval is provided at the rear of the tailpiece carriage, and the tailpiece carriage is advanced by a predetermined distance in the face direction Earth and sand generated during tunnel construction, characterized by the fact that a new belt receiving roller in front of the conveyor belt can be quickly attached to the concrete wall in the work scaffolding operation at the stop position and the conveyor belt transport operation can be resumed quickly. Transportation facility for crushed stone.

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