JPH01295994A - Excavating work of long and large space - Google Patents

Abstract

PURPOSE:To prevent the occurrence of noise by a method in which a belt conveyer connecting the end of excavation with a vertical pit is hung down in a lowerable manner by hangers, the excavation muck is dropped from the conveyer into the bucket of the vertical pit, and the conveyer is lowered as excavation proceeds. CONSTITUTION:A power-driven hanger 10 is attached to a beam 2a right below a ceiling part 2, a long and large belt conveyer 12 is provided to the hook of the hanger 10 to a vertical pit 3, and a truss-type base 12a to support the conveyer 12 is hung down from a wire 13. The excavation muck is put on any place of the conveyer 12 by bulldozer, small-size belt conveyer, and back hoe and carried along to the pit 3. The muck is dropped into a bucket 15 in the pit 3 and discharged to a hopper 17 by a bucket elevator 16. When the conveyer 12 is lowered by a guide 12b, it is lowered along a guide steel 14. The limit to discharging distance can thus be eliminated.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for excavating large spaces such as subway garages, underground parking lots, underground malls, etc. on the ground where the upper space is limited. It is.

(Prior Art) Conventionally, the excavation method for large underground spaces, such as subway garages, underground parking lots, or underground malls, has been generally carried out as follows: There is.

As shown in Figures 5 to 8, first, a pit (earth retaining work) 1 was installed to prevent the soil from collapsing, and a ceiling member (upper floor plate) 2 was installed to ensure safety during excavation work. By constructing this in advance, it is used as a strong upper retaining bar, restraining deformation of the earth retaining shaft 1, and preventing subsidence of the surrounding ground.

Next, excavation is carried out by hand near F of the ceiling member and around the pit, but as the excavation depth becomes deeper, tools such as Backbow B and Taramsiel are used.

A small bulldozer-D is used for cutting, transporting, and accumulating earth and sand.
or power shovels are used.

The excavated earth, sand, rock fragments, and other so-called "sludge" usually collect in the pit, and are then transported by bucket dropper etc. through the shaft 3 to the road, where they are loaded from hopper H onto a dump truck and shipped. .

The following methods are used to transport the materials until they are collected in the mine.

■Remove pickpockets using bulldozers, power shovels, etc.

■Also, the commonly used belt conveyor C (length 7m ~
The pickpockets will be carried out by adding 10 m).

■Furthermore, as shown in Figs. 5 to 8, a working shaft 4 is provided in advance at the bottom of the excavation, a belt conveyor 5 is installed therein, and a shaft 6 for shedding is provided toward the shaft.
Dirt is thrown into this vertical shaft 6 and is picked up and carried out by a belt conveyor 5.

[Problem to be solved by the invention]

However, among the above-mentioned excavation methods, there are the following problems regarding removal of shear. In other words, in the case of ■, transporting shear using pull doges, power shovels, etc. may cause a lot of noise, vibration,
The environment deteriorates due to exhaust gas, etc. Furthermore, since bulldozers and power shovels are moving around, there is a limit to the distance that can be efficiently transported.

In the case of (2), since multiple belt conveyors are used in one row for shear conveyance by adding conveyors, if one belt conveyor breaks down, all of the rows will stop working. In addition, there are many problems at the transfer section of the belt conveyor, such as mixing of shear, shear sticking out, and damage due to foreign objects. In the case of ■, the cost of equipment work for the shaft and shaft will be required in advance. A device is needed to smoothly transfer the scraps thrown into the bottom of the shaft onto the belt conveyor.

Another problem was that the shear input location was limited to the vertical shaft.

The present invention has been made in order to solve the problems in the conventional methods described above. The purpose of the present invention is to provide a method for excavating a long space by installing a long belt conveyor at the base and allowing excavated waste to be transported over a long distance.

[Means to solve the problem]

In order to achieve the above object, the present invention has a belt conveyor with a length connecting the end of the excavation to the shaft position, which is suspended so as to be descendable by a plurality of suspension devices supported by a ceiling member. This is an excavation construction method in which the belt conveyor intercepts the drippings, drops it into a bucket in the shaft, carries it out to the ground through the shaft, and lowers the belt conveyor as excavation progresses.

[For production]

The excavated slag is collected using a bulldozer, a power shovel, etc., and is manually transferred to a belt conveyor that connects the end of the excavation suspended from the previously constructed ceiling member (upper floor board) to the position of the shaft for discharging the slag. It is loaded onto a small conveyor belt, backhoe, etc., and transferred to a bucket in a shaft, from where it is discharged to the ground. As the excavation progresses,
As the excavation surface becomes deeper, the bell conveyor is lowered one by one using suspension devices provided at appropriate intervals on the ceiling member, so that excavation work can be performed continuously in the same manner as described above.

〔Example〕

Hereinafter, one embodiment of the present invention will be described in detail with reference to the accompanying FIGS. 1 to 4.

FIG. 1 is a longitudinal sectional view showing an outline of the present invention.

Reference numeral 1 in the figure is a pit installed as a retaining structure. 2
is a ceiling member (upper floor plate); this ceiling member 2 is constructed prior to large-section excavation, and restrains deformation of the shaft. An electric suspension device 10 that can be lowered to a beam 2a provided directly below the ceiling member 2 is attached at an appropriate interval from the excavation end to the position of the shaft 3 for sliding and carrying out. A truss-shaped pedestal 12a supporting one belt conveyor 12 is suspended by a hook 13 from a hook 11a at the tip of an electric chain block 11 of each electric suspension device 10. Further, a guide 12b is attached to the truss-shaped pedestal 12a of the belt conveyor 12, and the guide 12b descends along the guide steel material 14 when the belt conveyor 12 descends. Reference numeral 15 is a bucket that rides on the belt conveyor 12 and receives scratches, and reference numeral 16 is a bagut elevator that carries the bucket 15 out onto the street. , 17 are installed on the road in Potsupur.

This section describes the excavation method for the long space in the above structure. When a space of about 4 TrL is created under the ceiling member 2, one long belt conveyor 12 with a length from the excavation end to the position of the shaft 3 is installed. The interval between these belt conveyors is about 40 to 60 m, and depending on the excavation area, a plurality of belt conveyors may be provided. The excavated waste is accumulated by a bulldozer D, and placed at any position on this long belt conveyor 12 by hand, by a small belt conveyor C, by a backhoe B, or the like. The scraps on the belt conveyor 12 are carried to the shaft 3 and dropped into a bucket 15 inside the shaft 3. The bucket 15 is raised onto the road by a bucket elevator 16, and the shear in the bucket 15 is discharged into a hopper 17. It is then loaded onto a dump truck and transported to a landfill or residential development site.

As the excavation progresses, the long belt conveyor 12 is
It is lowered by an electric chain block 11 of a suspension device 10 that can be lowered and installed every 20 m. In conjunction with the descent of the long belt conveyor 12, the shear lifts of the bucket elevators 16 and the like in the shaft 5 section will also be supplemented. Then, the same excavation work as above is repeated until a predetermined depth is reached.

As mentioned above, it is a construction method that allows long distances to be intercepted, with a lowering device for carrying out the slide, and there is less noise, vibration, exhaust gas, etc., and there is a long belt. Since it is a conveyor, there are no problems at the transfer section, and there is no need for a preliminary work shaft or a vertical shaft for shedding. The work efficiency is high because it is a simple operation that involves lowering the belt conveyor as the excavation depth increases.

〔Effect of the invention〕

Since the present invention uses the construction method as explained above, it produces the effects as described below.

■Pull dope is transported from the excavation end to the position of the shaft for discharging the scrap by one long belt conveyor.
There is no noise, no photography, no exhaust gas, etc., which is caused by shearing and transporting with a power shovel or the like.

■Unlike removal by shearing using bulldozers, power shovels, etc., there are no restrictions on removal distance.

■Since each belt conveyor is one, it is possible to avoid problems at the transfer section when multiple belt conveyors are used.

■Since the belt conveyor can be supported by 8 electric suspensions from the top, lowering the belt conveyor is smooth and there is almost no work stoppage for lowering.

■The belt conveyor is supported by an electric suspension system from above, and the belt conveyor is lowered as excavation progresses (゛,
There is no need to install a working shaft or a vertical shaft for input.

■There are no restrictions on where the shear can be loaded onto the belt conveyor, and loading work can be done at any location.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing the excavation construction of a long space according to the present invention;
Figure 2 is a sectional view showing the state of shear being fed into the belt conveyor, Figure 3 is a sectional view showing the state of the belt conveyor and the suspension device suspended from the ceiling member, and Figure 4 is the same as in Figure 3. FIG. Moreover, FIGS. 5 to 8 are explanatory diagrams showing conventional construction examples, respectively. 2... Ceiling member, 3... Vertical shaft, 10... Suspension device, 12... (long) belt conveyor, 15...
···bucket.

Claims (1)

[Claims] A belt conveyor with a length connecting the excavation end to the shaft position is suspended so that it can be lowered by a plurality of suspension devices supported by a ceiling member, and the excavated shear is intercepted by the belt conveyor and transported to the shaft. It is dropped into a bucket and carried out to the ground through this shaft, and as the excavation progresses,
An excavation construction method for a long space characterized by lowering the belt conveyor.