JPH0256479B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an earth removal measuring device for a shield excavator.

In a shield excavator, it is important to measure the weight of excavated earth and sand in order to perform shield excavation while stabilizing the face.

For this reason, conventional methods have mainly adopted methods in which a measuring section is installed on a belt conveyor (belt scale), or a method in which measurements are taken at a fixed position in a vertical shaft. Although it is possible to measure relatively accurately when soil is continuously removed, there is a problem in that accuracy is lost when gravel etc. are mixed in with the soil.On the other hand, in the latter case,
The weight of the excavated soil could not be measured until it was transported to the shaft, and due to the time lag, the measured value could not be immediately transmitted to the excavator.

In view of the above circumstances, the present invention has been made to provide a device for measuring the amount of excavated earth that can accurately measure the weight of earth and sand excavated and discharged by a shield excavator, and the gist thereof is as follows. A shield excavator equipped with a speed-adjustable screw conveyor for discharging excavated earth and sand is connected to the rear of the shield excavator so as to follow the excavation movement of the excavator, and to the following truck, A conveyance device for conveying the earth and sand discharged from the screw conveyor is installed, and a weighing unit for weighing the weight of the discharged earth supplied to the waiting Zuri Toro is installed at the bottom of the earth and sand discharge section of the conveyance device. The measuring unit is disposed so as to be movable in the direction of excavation movement of the excavator, and the measuring unit and the following truck are connected by a slide jack.

Embodiments of the present invention will be described below with reference to the drawings.

In Fig. 1, 1 is a shield excavator, 2 is a sleeper laid sequentially at right angles to the excavation direction in a tunnel 3, 4 is a screw conveyor of excavator 1, and 5 is a screw conveyor of excavator 1.
is a segment provided on the inner wall of tunnel 3.

As shown in FIGS. 2 to 4, a following truck 7 is equipped with an earth removal belt conveyor 6 at the rear of the excavator 1.
The trolley 7 and the excavator 1 are connected by a wire or the like, and the trolley 7 is connected to rails 8, 8 in the tunnel 3 direction, which are laid at predetermined intervals on the sleepers 2.
The rails 8, 8 are configured to be able to run on the rails 8, 8.
In between, a weighing unit 9 is arranged on the sleeper 2 so that a part of it enters into the carriage 7.

This weighing unit 9 is connected to the cart 7 by a slide jack 10, and has a base plate 11 that can slide on the sleepers 2 by operating the slide jack 10. Auxiliary rails 13, 13 for Zuritoro which serve as rails are provided.

Further, as shown in FIGS. 5 to 7, at the rear of the auxiliary rails 13, 13, there is a measuring device 14 such as a load cell for measuring the weight of the earth and sand in the Zuritoro 12.
As shown in FIGS. 8 and 9, at the rear ends of the auxiliary rails 13, 13, when the weighing unit 9 slides forward by operating the slide jack 10, each of the rear Telescopic rails 15 are arranged in series to close the gaps formed between them and the sliding rails 16. In addition, 1 in the figure
2' is the wheel of Zuritro 12.

FIG. 10 shows a connection example of the measuring instrument 14, in which 20 is a junction box, 21 is an amplifier, 22 is a measuring instrument output conversion board, and 23 is an indicator.

In such a configuration, when performing excavation work with the excavator 1, the slide jack 10 between the truck 7 and the weighing unit 9 is set in a free state in advance. However, when excavator 1 excavates forward (the third
(see imaginary line in the figure), trolley 7 connected to excavator 1
moves following the excavator 1, but the metering unit 9 remains stationary.

While excavation work is being carried out in this manner, the sander 12 is positioned on the auxiliary rails 13, 13 in which the weighing device 14 is incorporated, receives earth and sand from the belt conveyor 6, and measures the weight of the earth and sand. Based on this measured value, it is checked whether the planned excavation speed of the excavator 1 and the weight of the excavated soil match. If they are not, the rotation speed of the screw conveyor 4 is adjusted and the weight of the excavated soil is adjusted. Adjust to match planned speed. That is, before the excavation machine 1 excavates, the worker sets the rotation speed of the hydraulic pump that supplies oil to the shield jack for excavation machine 1 in accordance with the planned excavation speed, or sets the opening degree of the flow rate control valve. The adjustment is made in advance, and the drive device for the screw conveyor 4 is also adjusted in accordance with the planned excavation speed.

When excavation by the excavator 1 starts, the excavated earth and sand is taken into the chamber, conveyed by the screw conveyor 4 and belt conveyor 6, and transferred to the slider 12 waiting above the auxiliary rail 13 of the weighing unit 9. The weight of the earth and sand is measured and displayed on the indicator. The weight of the earth and sand indicated by the indicator is read by the worker as appropriate.

On the other hand, the relationship between the planned excavation speed and the weight of excavated soil is determined in advance by W.
= A・V・γ・t (W is the weight of the earth and sand that should be discharged according to the planned excavation speed V of the excavator 1, A is the cross-sectional line perpendicular to the axis of the excavator 1, and γ is the weight of the earth and sand The specific gravity, t, is determined by the time required for supplying the earth and sand to the Zuritoro 12. Then, it is supplied to the Zuritro 12 at a predetermined period of time, and is fed to the measuring unit 9.
If the weight of the earth and sand weighed by is heavier than W mentioned above, it means that earth and sand is being taken in from the outer periphery of the excavator 1. If this is left unattended, the pressure inside the cutter chamber will increase due to excessive earth and sand being discharged. There is a risk that the downhill face will collapse. Therefore, in this case, the rotation speed of the screw conveyor 4 is lowered by adjusting the drive device of the screw conveyor 4 (the adjusting means may be any conventionally known means). This increases the pressure within the cutter chamber to an appropriate level and stabilizes the face. On the other hand, if the weight of the weighed earth and sand is less than the above-mentioned W, the pressure inside the cutter chamber for taking in earth and sand of the excavator 1 will increase, resulting in over-consolidation, and the excavated and taken earth and sand will flow out of the cutter chamber. There is a risk that the ground surface will rise in the area where excavation is being carried out. Therefore, in this case, the drive device for the screw conveyor 4 is adjusted to increase the rotation speed of the screw conveyor 4. As a result, the pressure inside the cutter chamber decreases to an appropriate level, and the face is stabilized. The rotational speed of the screw conveyor 4 may be adjusted automatically or manually by an operator.

The weight of the earth and sand may be measured by the weighing unit 9 at regular intervals as described above, but the weight of the earth and sand may be measured by detecting the amount of rod movement of the shield jack that excavates the excavator 1 with a position detector such as a scale. It may also be possible to check whether the weight is commensurate with the amount of rod movement. This is because the amount of rod movement increases in proportion to time once the planned excavation speed is determined.

In the above operation, since the place where the weight of the earth and sand is measured is immediately after the excavator 1, the speed control of the screw conveyor 4 can be performed immediately with almost no time lag, and the amount of earth and sand discharged can be controlled immediately. It can be made appropriate. For this reason, excavation can be performed stably.

After performing a predetermined excavation work with the excavator 1, that is, when the slide jack 10 reaches the stroke end or just before reaching the stroke end, the slide jack 10 is retracted. The connected weighing unit 9 is connected to the sleeper 2.
The upper part is slid and pulled toward the cart 7, and the excavation work is then carried out again while measuring the amount of soil to be removed.
In this excavation work, when the excavator 1 excavates, the cart 7 moves together with the excavator 1, but the weighing unit 9 does not move. Moreover, Zuritro 12 is not moving and is stopped. Then, while the excavator 1 is stopped and the segments are being assembled (during this period, no excavation is performed and no earth and sand is discharged), the slide jack 10 is operated to move the weighing unit 9 to the base plate 1.
1, and the slider 12 is also advanced onto the metering unit 9. At this time, since earth and sand are not supplied from the belt conveyor 6 for discharging soil to the dumping trolley 12, the dumping trolley 12 does not need to be moved in synchronization with the weighing unit 9, but may be moved separately. In addition, the auxiliary rails 13, 13 of the weighing unit 9
Since the telescopic rails 15 are connected to each rear end, even if the weighing unit 9 slides forward as described above, by extending the telescopic rails 15, there will be no space between it and the rear slider rail 16. No gaps are formed. Therefore, by repeating the above steps an appropriate number of times, once the sandbox 12 is filled with earth and sand, the sandbox 12 can be immediately transported to the shaft section.

In addition, in the above, the extension stroke of the telescopic rail 15 is made to match the standard length of the rail 16 for Zurito, and when the extension stroke of the telescopic rail 15 reaches the specified length, the telescopic rail 15 is retracted and the fixed length is reached. It would be convenient if a rail 16 for Zuritoro was added. In particular, if the work to add the rails 16 for the ZuriToro is carried out while the ZuriToro 12 is being transported to the shaft part, the work can be facilitated.
Since the work is done behind the main structures such as the weighing unit 9, it can be carried out safely in a wide space.

In addition, in the above embodiment, the telescopic rail 1
5 is used, but the telescopic rail 15 may not be used, and the slider rails 16 may be sequentially added before the measuring unit 9 moves forward by a fixed distance.

FIGS. 11 and 12 show another embodiment of the present invention. In the embodiment described above, a slider rail 16 was sequentially added behind the weighing unit 9.
In this embodiment, the slider rail 16 is successively added in front of the weighing unit 9'. Note that the same reference numerals as in the above embodiment indicate the same parts.

That is, in this embodiment, the trolley 7 is placed on the rails 16, 16 for the sliding trolley fixed on the sleeper 2.
A board 11 connected with a slide jack 10 is slidably mounted, and on the board 11, a measuring rail 17 and inclined rails 18 and 19 are arranged in front and behind the measuring rail 17, respectively. Furthermore, a measuring device 14 is provided on the measuring rail 17 to form a measuring unit 9', and the measuring unit 9' is operated by the slide jack 10 to move the measuring device 14 to the measuring rail 16,
Before the weighing unit 9' is slid on the weighing unit 16 and pulled toward the trolley 7, a fixed length rail 16 is successively added to the front part of the weighing unit 9'.

In the case of this system, since the work of adding the rail 16 for the droplet trolley is not performed behind the measuring unit 9', the movement of the droplet trolley 12 is not hindered by the adding work.

As explained above, according to the present invention, the weight of the excavated earth and sand can be measured at any time while the excavation machine is excavating.
It is possible to check whether the planned excavation speed of the excavator and the weight of the excavated soil are appropriate, and if they are not appropriate, to immediately control the rotational speed of the screw conveyor appropriately, thereby ensuring stability of the face. The excellent effect of being able to carry out shield digging while holding the shield can be achieved.

[Brief explanation of the drawing]

FIG. 1 is a schematic side view showing the entire device of the present invention, FIG. 2 is a side view showing details of the device of the present invention,
3 is a plan view of FIG. 2, FIG. 4 is a front view of FIG. 2, and FIG. 5 is a plan view showing the main parts of the device of the present invention.
Fig. 6 is a side view of Fig. 5, Fig. 7 is a directional view of Fig. 5, Fig. 8 is a plan view of the telescopic rail, Fig. 9 is a directional view of Fig. 8, and Fig. 10. 11 is a side view showing another embodiment of the device of the present invention, and FIG. 12 is a view taken in the direction of arrow XII in FIG. 11. 1...Shield excavator, 2...Sleeper, 7...Following truck, 9, 9'...Measuring unit, 10...Slide jack, 14...Measuring instrument.

Claims (1)

[Claims] 1. A following truck is connected to the rear of a shield excavator equipped with a speed-adjustable screw conveyor for discharging excavated earth and sand so as to follow the excavation movement of the shield excavator, and the following truck is connected to the A conveyance device for conveying the earth and sand discharged from the screw conveyor is installed, and a weighing unit for weighing the weight of the earth supplied to the waiting Zuri Toro is installed at the bottom of the earth and sand discharge section of the conveyance device. A device for measuring the amount of earth removed by a shield excavator, characterized in that the device is arranged to be movable in the direction of excavation movement of the machine, and the measuring unit and the following truck are connected by a slide jack.