JP2001187623A - Belt conveyor operating method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a belt conveyor operating method capable of preventing the meander of a belt conveyor without raising the cost of a belt conveyor device and without lowering the efficiency of the tunnel construction. SOLUTION: A straight belt conveyor 1 and two curved belt conveyors 2, 3 are connected to each other so that the excavated sediment can be transferred from the upstream to the downstream. The straight belt conveyor 1 is provided so that an upstream end thereof faces to a chamber 6 of a tunnel excavating machine 5 and receives the excavated sediment, and on the other hand, a downstream end of the curved belt conveyor 3 is arranged at an excavated sediment collecting place 9 so as to discharge the carried excavated sediment. When stopping the excavation by the tunnel excavating machine 5, the curved belt conveyors 2, 3 are slowly operated without stopping them. with this structure, when starting the carrying of the excavated sediment again, restart of the curved belt conveyors 2, 3 is unnecessary, and deflection of the belt and unbalance of the tensile force of the belt are avoided, and the meander of the belt is thereby prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for operating a belt conveyor in which one or more belt conveyors are connected so that they can be transited.

[0002]

2. Description of the Related Art For example, in shield tunnel construction,
BACKGROUND ART In order to transport excavated earth and sand generated by a tunnel excavator excavating the ground, a plurality of belt conveyors in which transported objects are interchangeably connected are used. The plurality of belt conveyors have their upstream ends facing the chamber (excavation storage room) of the tunnel excavator, while their downstream ends are located outside the tunnel at the excavated sediment collection site.

Conventionally, there are the following methods for operating the plurality of belt conveyors. First, the plurality of belt conveyors are activated immediately before the tunnel excavator starts excavating the ground. Then, the tunnel excavator starts excavation of the ground, and the tunnel excavator discharges the excavated earth and sand, and the plurality of belt conveyors transport the excavated earth and sand from the chamber to the excavated earth and sand collection place. next,
When the tunnel excavator excavates about 1 m, the ground excavation stage is completed in the tunnel excavation cycle, and the process proceeds to the stage of installing a tunnel support. At this stage, the tunnel excavator is stopped, and the plurality of belt conveyors are stopped in order to maintain the durability of the belt of the belt conveyor and to reduce the power consumption of the belt conveyor. Further, when the step of installing the tunnel support is completed and the process proceeds to the step of excavating the ground, the tunnel excavator resumes excavation of the ground. Then, the plurality of belt conveyors are started again, and the excavated soil is transported from the chamber of the tunnel excavator to the excavated soil collection site.

[0004] In addition to the step of installing the shoring of the tunnel, the tunnel excavator is stopped when a worker is changed or when the tunnel excavator is inspected. It is also stopped.

By the way, in the above-mentioned conventional belt conveyor operating method, every time the installation of the above-mentioned support excavates the tunnel by about 1 m, the excavator is switched between excavation and stoppage of the tunnel excavator in a short time, and the belt conveyor is started up. Since the stop and the stop are switched in a short time, the belt meanders when the belt conveyor is started, and the meandering belt collides with the frame of the belt conveyor, so that there is a problem that the belt conveyor cannot be operated steadily. .

The meandering of the belt of the belt conveyor is caused by the following reasons. First, when the driving pulley drives the belt when the belt conveyor starts, the frictional force acting on the belt suddenly decreases from the static frictional force to the dynamic frictional force, so that the tension acting on the belt suddenly decreases. This is because the belt bends. Second, a sudden decrease in the tension of the belt causes a part of the belt to deteriorate, and the tension of the belt in the deteriorated part decreases, so that the belt tension becomes unbalanced in the width direction. Third
In addition, when the belt bends, excavated earth and sand of the conveyed material bite between the pulley and the belt, and the tension acting on the belt from the pulley becomes unbalanced in the width direction.

The meandering of the belts of the belt conveyor caused by the above increases when the plurality of belt conveyors are connected and when the plurality of belt conveyors include the curved belt conveyor. This is because the use of a plurality of belt conveyors results in a plurality of belt driving parts that cause the belt to bend. In the curved belt conveyor, since the belt is curved in a plane, the tension of the belt is greater on the outside in the width direction of the belt than on the inside in the width direction of the belt, and therefore, a force acts on the belt inward in the width direction. Because.

In order to solve the above problem, recently,
As a first solution, a belt conveyor having a guide roller or the like as a meandering prevention roller has been proposed.

[0009] As a second solution, the tension of the belt of the belt conveyor is controlled so as not to be unbalanced.
There has been proposed a belt conveyor operating method in which the belt traveling speed is gradually increased when the belt conveyor is started, and sufficient time is taken until the belt conveyor reaches a steady speed.

[0010]

However, the belt conveyor as the first solution has a problem that the belt conveyor device becomes complicated and the cost for manufacturing the belt conveyor device increases.

In the belt conveyor operating method as the second solution, the tunnel excavation work cannot be started until the belt conveyor reaches a steady speed, so that the transport time of the excavated earth and sand in the tunnel excavation cycle is occupied. Increase the efficiency of tunnel construction.

An object of the present invention is to provide a belt conveyor operating method capable of preventing the belt conveyor from meandering without increasing the cost of the belt conveyor device and without deteriorating the efficiency of tunnel construction. To provide.

[0013]

In order to achieve the above object, a method for operating a belt conveyor according to the first aspect of the present invention comprises:
A method of operating a belt conveyor that connects one or more belt conveyors so that the goods can be transited, and conveys the goods from the uppermost stream to the lowermost stream of the one or more connected belt conveyors. It is characterized in that all the belt conveyors are operated in a steady state at a constant speed, and at the time of transportation interruption, at least the lowermost belt conveyor operates slowly without stopping.

According to the belt conveyor operating method of the first aspect of the present invention, even if there is no conveyed material, at least the lowermost belt conveyor operates slowly without stopping. Then, when transporting the goods again, it is only necessary to switch the belt conveyor from the slow operation to the steady operation, and it is not necessary to start the belt conveyor from a stopped state. Therefore, it is possible to avoid belt deflection and imbalance in belt tension that occur when the belt conveyor is started, thereby preventing belt meandering. Switching from slow operation to steady operation only requires increasing the traveling speed of the belt,
The belt conveyor can be brought into a transportable state in a short time, and the efficiency of the transport operation is improved. Furthermore, since the belt conveyor operates slowly, the power consumption of the belt conveyor can be reduced.

According to a second aspect of the present invention, there is provided the belt conveyor operating method according to the first aspect of the present invention, wherein when shifting from the above-mentioned transportation to the above-mentioned transportation interruption, the belt is moved from the upstream belt conveyor to the downstream belt conveyor. In order to switch from the steady operation to the slow operation in turn, when shifting from the time of the transportation interruption to the time of the transportation, switching from the slow operation to the steady operation in order from the downstream belt conveyor to the upstream belt conveyor. It is characterized by.

According to the belt conveyor operating method of the present invention, when the transportation is interrupted, the operation is switched from the steady operation to the slow operation in order from the upstream side to the downstream side of the belt conveyor. The belt conveyor can be switched to slow operation after being sent to the downstream side without fail.
Conveyed material does not stay in the middle of the belt conveyor. Also, when transporting is started from an interruption, the operation is switched from slow operation to steady operation in order from the downstream side to the upstream side of the belt conveyor. Has been replaced. Therefore, the conveyed goods can be smoothly conveyed to the downstream side without being interrupted in the middle of the belt conveyor.

According to a third aspect of the present invention, there is provided a belt conveyor operating method comprising: a first belt conveyor having an upstream end facing a chamber of a tunnel excavator; and a second belt conveyor following the first belt conveyor. A method of operating a belt conveyor for transporting excavated materials from the tunnel excavator to the outside of a tunnel, wherein the tunnel excavator performs a steady operation of the first belt conveyor and the second belt conveyor during excavation, When the excavation of the tunnel excavator is stopped, the first belt conveyor is stopped, and then the second belt conveyor is switched to a slow operation. At the start of excavation of the tunnel excavator, the second belt conveyor is switched to a steady operation. After that, the first belt conveyor is started.

According to the belt conveyor operating method of the third aspect of the invention, when the excavated earth and sand is not transported, the second belt conveyor is moved slowly without stopping, so that when the excavated earth and sand is transported again, the second belt conveyor is moved slowly. There is no need to start the two-belt conveyor again. Accordingly, it is possible to avoid belt deflection and imbalance in belt tension that occur when the stopped belt conveyor is started, thereby preventing belt meandering. In addition, since the belt can be switched from slow operation to steady operation in a short time, excavated soil can be transported immediately,
The efficiency of tunnel construction can be improved. Furthermore, since the belt conveyor operates slowly, the power consumption of the belt conveyor can be reduced.

When the tunnel excavator does not excavate, the first belt conveyor is stopped and then the second belt conveyor is switched to the slow operation. Then, since the first belt conveyor does not convey the excavated earth and sand when the second belt conveyor is running slowly, the excavated earth and sand do not accumulate on the second belt conveyor.

On the other hand, when the tunnel excavator excavates, the first belt conveyor is started after the second belt conveyor is switched from the slow operation to the steady operation. Then, the excavated earth and sand can be reliably placed on the second belt conveyor that is operating in a steady state, and the excavated earth and sand does not stay on the second belt conveyor.

According to a fourth aspect of the present invention, there is provided the belt conveyor operating method according to the third aspect, wherein the plurality of second belt conveyors are provided, and when the excavation of the tunnel excavator is stopped, the plurality of second belt conveyors are provided. The two-belt conveyor is switched from the steady operation to the slow operation in order from the upstream to the downstream, and at the start of the excavation of the tunnel excavator, the plurality of second belt conveyors are sequentially operated from the downstream to the upstream. It is characterized by switching from slow operation to steady operation.

According to the belt conveyor operating method of the present invention, the plurality of second belt conveyors are sequentially switched from the steady operation to the slow operation from the upstream side to the downstream side, and are also operated from the downstream side. Since the operation is gradually switched from the slow operation to the steady operation toward the upstream side, the excavated earth and sand can be smoothly transported without being blocked in the middle of the plurality of second belt conveyors.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments.

FIG. 1 shows the construction of a shield tunnel.
It is a top view showing a plurality of belt conveyors provided for carrying excavated earth and sand. These belt conveyors 1, 2,
Numeral 3 comprises a straight belt conveyor 1 as a first belt conveyor and two curved belt conveyors 2 and 3 as a second belt conveyor. As shown in the side view of FIG. Excavated earth and sand are connected so that they can be connected. The most upstream straight belt conveyor 1 has its upstream end facing the chamber 6 of the tunnel excavator 5, and has its downstream end located at the excavated sediment collection site 9 outside the tunnel 8. ing.

Next, a method of operating the belt conveyor of this embodiment will be described with reference to a flowchart shown in FIG.

First, the stopped belt conveyor 1,
Of the two conveyors 2, the two downstream curved belt conveyors 2 and 3 are started (S51), and the curved belt conveyors 2 and 3 are operated slowly (S52). After the traveling of the curve belt conveyors 2 and 3 is stabilized by the slow operation, the traveling speed of the belts is increased in the order of the curve belt conveyors 3 and 2 from the downstream side to switch to the steady operation (S53). Thereafter, the most upstream straight belt conveyor 1 is started (S54), and the preparation for transporting the belt conveyors 1, 2, and 3 is completed.

After the preparation for transporting the belt conveyors 1, 2, 3 is completed, excavation by the tunnel excavator 5 is started (S).
55). The tunnel excavator 5 cuts the ground with a cutter head 11 provided on the front surface, and guides the cut excavated earth and sand to a chamber (excavation storage room) 6 to temporarily store the excavated soil.
When the tunnel excavator 5 further excavates the ground and moves forward, and excavated earth and sand exceeds a predetermined amount stored in the chamber 6, the excavated earth and sand is discharged to the upstream end of the linear belt conveyor 1 facing the chamber 6. The excavated earth and sand discharged to the straight belt conveyor 1 is transported to the downstream side as shown by the arrow A, is connected to the curved belt conveyor 2 and is transported in the direction shown by the arrow B, and is further connected to the curved belt conveyor 3 to be arrowed. It is transported in the direction shown by C. Then, the excavated earth and sand is discharged to the excavated earth and sand collection place 9 where the downstream end of the curved belt conveyor 3 is arranged.

When the tunnel excavator 5 excavates a predetermined length (S56), the tunnel excavator 5 stops excavating (S56).
57). Here, if the excavation of the entire length of the tunnel has not been completed (S58), only the straight belt conveyor 1 is stopped (S59), and thereafter, the curve belt conveyors 2, 3 are sequentially switched to the slow operation from the upstream side. (S6
0).

When the belt conveyors 2 and 3 are switched to the slow operation, work such as installation of a shoring, replacement of workers, and inspection and maintenance of a tunnel excavator are performed. When these operations are completed and preparations for excavation of the tunnel are completed (S61), the process returns to step S53, and the curve belt conveyors 2, 3 are sequentially operated from the slow operation in the order of the curve belt conveyors 3, 2 from the downstream side. Switch to operation. Then, the straight belt conveyor 1 is started again (S54), and the excavation of the tunnel excavator is restarted (S55).

Steps S53 to S61 are repeated to advance the excavation of the tunnel. When the excavation of the entire length of the tunnel is completed, all the belt conveyors 1, 2, and 3 are stopped (S62), and the excavation work of the tunnel is completed. .

With respect to the above-described operation method of the belt conveyors 1, 2, and 3, in steps S53 and S54, the belt conveyors 1, 2, and 3 are sequentially switched from a downstream side to a steady operation or are started. When the machine resumes excavation, all belt conveyors 1, 2, 3
Is in steady operation. Accordingly, the excavated earth and sand discharged to the uppermost straight belt conveyor 1 is smoothly transported to the downstream end of the curved belt conveyor 3, so that the excavated earth and sand does not stay on the belt conveyors 1, 2, and 3.

In steps S59 and S60, the belt conveyors 1, 2, and 3 are switched from the upstream side to stop or slow operation.
The excavated earth and sand on a few places is surely sent to the downstream side. Accordingly, the belt conveyors 1, 2, and 3 are stopped and driven slowly in a state where there is no excavated earth and sand, and the excavated earth and sand do not accumulate on the belt conveyors 1, 2, and 3.

Further, in step S60, when the tunnel excavator 5 stops, the curve belt conveyor 2,
Since the tunneling excavator 5 resumes excavation of the ground after this, the transportation of the excavated earth and sand is started only by increasing the traveling speed of the belts of the curved belt conveyors 2 and 3 since the tunnel excavator 5 resumes excavation of the ground without stopping the excavation. it can. That is, since the curved belt conveyors 2 and 3 do not need to be started, it is possible to avoid belt deflection and imbalance in tension that occur when the stopped belt conveyor is started, thereby preventing belt meandering.

Further, since the curve belt conveyors 2 and 3 which perform the slow operation can be switched to the steady operation in a short time, the operation can be shifted to the tunnel excavation stage in a short time and the waiting time until the excavation stage is shifted. The time can be shortened and the efficiency of tunnel construction can be improved.

Furthermore, when the tunnel excavator 5 is not excavating, the belt conveyors 1, 2, and 3 are stopped and running slowly, so that the power consumption of the belt conveyors 1, 2, and 3 can be reduced.

Although the method of operating the belt conveyor of the above embodiment is applied to transporting excavated earth and sand in shield tunnel construction, it can also be applied to a belt conveyor used for other purposes.

The present invention can be applied to a belt conveyor having a suspended transportation period when used, and may be of any type.

[0038]

As is clear from the above, according to the first aspect of the present invention, even if there is no conveyed material, at least the lowermost belt conveyor operates slowly without stopping, so that the conveyed material is transported again. Sometimes it is not necessary to start the belt conveyor, so that it is possible to avoid belt deflection and imbalance in belt tension that occur when the belt conveyor is started, thereby preventing belt meandering. In addition, since the belt conveyor can be brought into a transportable state in a short time, the efficiency of the transport operation is improved. Furthermore, since the belt conveyor operates slowly, the power consumption of the belt conveyor can be reduced.

According to the second aspect of the present invention, when the operation is interrupted, the operation is switched from the normal operation to the slow operation in order from the upstream side to the downstream side of the belt conveyor. Can be switched to slow operation, while at the start of transportation, the operation is switched from slow operation to steady operation in order from the downstream side to the upstream side, so that the conveyed material does not stay in the middle of the belt conveyor.

According to the third aspect of the invention, when the excavated soil is not transported, the second belt conveyor is moved slowly without stopping, so that the second belt conveyor is restarted when the excavated soil is transported again. Therefore, it is possible to avoid belt deflection and imbalance of belt tension, thereby preventing belt meandering. In addition, the transport of excavated earth and sand can be resumed in a short time, and the efficiency of tunnel construction can be improved. Furthermore, when the excavated earth and sand are not transported, the belt conveyor operates slowly, so that power consumption can be reduced.

Further, since the second belt conveyor is switched to the slow operation after stopping the first belt conveyor, the first belt conveyor is started after the second belt conveyor is switched from the slow operation to the steady operation. Excavated sediment does not accumulate on the 2-belt conveyor.

According to the fourth aspect of the present invention, the plurality of second belt conveyors are sequentially switched from the steady operation to the slow operation from the upstream side to the downstream side, and are sequentially switched from the downstream side to the upstream side. Since the operation is switched from the slow operation to the steady operation, the excavated soil can be smoothly transported without the excavated sand remaining in the middle of the plurality of second belt conveyors.

[Brief description of the drawings]

FIG. 1 is a plan view showing a belt conveyor for shield tunnel construction to which a method for operating a belt conveyor according to an embodiment of the present invention is applied.

FIG. 2 is a side view showing a belt conveyor for a shield tunnel construction to which the belt conveyor operating method according to the embodiment of the present invention is applied.

FIG. 3 is a flowchart showing an operation method of the belt conveyor according to the embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Straight belt conveyor 2 Curve belt conveyor 3 Curve belt conveyor 5 Tunnel excavator 6 Chamber 8 Tunnel 9 Excavation earth and sand collection place

Continued on front page F-term (reference) 2D054 DA02 GA58 3F023 AA02 AB02 BA01 BB01 BC02 DA03 FA08 GA07 3F027 AA02 CA07 DA04 DA24 DA25

Claims (4)

[Claims] 1. A method of operating a belt conveyor, wherein one or more belt conveyors are connected so that a conveyable article can be transited and the conveyed articles are conveyed from the most upstream to the most downstream of the one or more connected belt conveyors. A method of operating a belt conveyor, wherein all the belt conveyors are constantly operated at a constant speed during transportation, and at the time of transportation interruption, at least the lowermost belt conveyor is operated slowly without stopping. 2. The method for operating a belt conveyor according to claim 1, wherein when moving from the time of the transportation to the time of the interruption of the transportation, the steady operation is performed in order from the upstream belt conveyor to the downstream belt conveyor. A method of operating a belt conveyor, comprising: switching from a slow belt operation to a steady operation in order from a downstream belt conveyor to an upstream belt conveyor when shifting from the suspension of the transportation to the transportation during the transportation. 3. A first belt conveyor having an upstream end facing a chamber of a tunnel excavator, and a second belt conveyor following the first belt conveyor. A method of operating a belt conveyor for transporting the first belt conveyor and the second belt conveyor during the excavation of the tunnel excavator, and when the excavation of the tunnel excavator is stopped, the first belt conveyor and the second belt conveyor are constantly operated. After stopping the one belt conveyor, the second belt conveyor is switched to the slow operation. At the start of the excavation of the tunnel excavator, the second belt conveyor is switched to the steady operation, and then the first belt conveyor is started. An operation method of a belt conveyor, characterized in that: 4. The method of operating a belt conveyor according to claim 3, wherein the plurality of second belt conveyors are provided, and when the excavation of the tunnel excavator is stopped, the plurality of second belt conveyors are provided.
The belt conveyor is switched from the steady operation to the slow operation in order from the upstream side to the downstream side, and when the excavation of the tunnel excavator starts, the plurality of second
An operation method of a belt conveyor, wherein the belt conveyor is sequentially switched from a slow operation to a steady operation from a downstream side to an upstream side.