JP-7857144-B2 - Belt conveyor stopping device and abnormal location detection system

JP7857144B2JP 7857144 B2JP7857144 B2JP 7857144B2JP-7857144-B2

Inventors

牧野大介
副島幸也
山中純士
土門修一

Assignees

株式会社安藤・間
青山機工株式会社

Dates

Publication Date: 20260512
Application Date: 20220407

Claims (4)

A device for stopping a belt conveyor operating inside a tunnel under excavation , A pull-cord switch , which is installed on a frame for a belt conveyor and has a pull cord, The system includes a detection lamp connected to the aforementioned pull-cord switch and emitting visible light, The aforementioned pull rope switch stops the belt conveyor when the pull rope is pulled. The detection light emits visible light when the pull rope switch stops the belt conveyor. The aforementioned detection light is installed on a mounting base for detection lights attached to the lining concrete and positioned below the mounting base for the belt conveyor. A belt conveyor stopping device characterized by the following features.
The aforementioned pull rope switch has a contact changeover switch and two or more cable contacts, The two lighting cables connected to the aforementioned detection lamp are each connected to different cable contacts. When the pull rope is pulled, the contact change switch connects the cable contacts to which the lighting cable is connected, causing the detection lamp to emit visible light. The belt conveyor stopping device according to claim 1, characterized in that it is a belt conveyor stopping device.
The aforementioned detection light is positioned within reach of a person, is detachably attached to two of the aforementioned lighting cables, and is portable. The detection lamp, which has been removed from the aforementioned lighting cable, outputs visible light when the power is operated. The belt conveyor stopping device according to feature 2.
A system for detecting an abnormal location on a belt conveyor using the belt conveyor stopping device described in any one of claims 1 to 3, The aforementioned belt conveyor and, The system includes belt conveyor stopping devices installed at multiple locations along the belt conveyor at intervals, When the pull rope switch that stops the belt conveyor stops the belt conveyor, the detection light emits visible light, thereby enabling the detection of abnormal areas in the belt conveyor. An abnormal location detection system characterized by the following features.

Description

This invention relates to a belt conveyor for transporting excavated spoil towards the tunnel entrance, and more specifically, to a belt conveyor stopping device capable of detecting the location of an abnormality when an abnormality occurs in the belt conveyor, and an abnormality detection system equipped with this device. It is said that approximately two-thirds of Japan's landmass is mountainous, and therefore, roads, railway lines, and other infrastructure (hereinafter referred to as "roads, etc.") almost always pass through mountainous areas. To construct roads, etc., in these mountainous areas, it is common to employ either the cut-and-fill method, which involves excavating a portion of the slope, or the tunnel method, which involves hollowing out the natural ground. While the tunnel method tends to have higher construction costs per unit length (construction cost per road, etc.) compared to the cut-and-fill method, it tends to require less excavated soil (i.e., less excavated soil), and offers greater flexibility in road alignment planning (for example, the ability to create shortcuts). It is said that more than 10,000 tunnels have been constructed in Japan to date. Until the 1970s, the dominant method for constructing mountain tunnels was the "sheet pile method," which combined steel arch supports with wooden sheet piles to support the ground. However, currently, the NATM (New Australian Tunneling Method), which actively utilizes the strength of the ground, is the mainstream. The NATM's main characteristic is its design philosophy that relies on the strength (arch effect) of the ground. Therefore, compared to the conventional sheet pile method, it allows for a smaller scale of tunnel support and faster construction, thus reducing construction costs. Furthermore, since the full-scale implementation of NATM in Japan, excavation technology has advanced dramatically. Various auxiliary methods have been developed, making it possible to handle diverse ground conditions, and mechanical excavation has become an option in addition to blasting. There are also several methods for transporting the rock fragments (rock broken into smaller pieces by blasting) and soil (hereinafter collectively referred to as "spoil") generated by blasting to the outside of the mine. These include the "tire type," where the spoil is transported by loading it onto dump trucks; the "rail type," where the spoil is transported using rails laid inside the mine; and the "belt conveyor type," where the spoil is transported using a continuous belt conveyor system installed inside the mine. Of these methods, belt conveyor-type spoil transport generally requires the installation of equipment covering the entire length of the tunnel (excavation length). However, it can be carried out in parallel with other processes (e.g., concrete spraying), thus shortening the excavation cycle. Furthermore, it does not use fossil fuels like dump trucks, thus minimizing environmental impact (especially on the underground environment). It is also more economically advantageous than other methods for long excavation lengths. Therefore, belt conveyor-type spoil transport tends to be adopted for relatively long tunnels such as those for high-speed rail lines (e.g., the Chuo Shinkansen maglev line) and expressways. Typically, a continuous belt conveyor system consists of a belt conveyor, a mobile crusher, a tailpiece trolley, a belt storage device, a main drive device, etc. This belt conveyor is an endless belt that circulates between a head pulley on the mine entrance side and a tail pulley (tailpiece trolley) on the working face side; in other words, the head pulley and tail pulley function as reversal points for the endless belt. More specifically, at the head pulley on the mine entrance side, the endless belt moves from the top to the bottom and reverses direction from moving towards the mine entrance to moving towards the working face. At the tail pulley on the working face side, the endless belt moves from the bottom to the top and reverses direction from moving towards the working face to moving towards the mine entrance. This allows the spoil piled on the top of the endless belt to be transported to near the mine entrance. Blasting only breaks the bedrock into relatively large chunks, and this mass cannot be transported by a belt conveyor in this state. Therefore, a mobile crusher further breaks the rock chunks generated by the blasting into smaller pieces. The crushed rock (spoil) is then fed into the spoil input section (input hopper) of the tailpiece trolley and transported towards the tunnel entrance on a belt conveyor. The tailpiece trolley is equipped with self-propelled means such as crawlers or tires, allowing it to move (advance) as the tunnel face progresses. As the tailpiece trolley moves forward, the belt conveyor is pulled, and the belts stored in the belt storage device are sequentially unwound, extending the belt conveyor. Incidentally, in