JPS621076B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an excavated soil amount measuring device for an earth pressure type shield excavator.

In conventional earth pressure type shield excavators, the excavated earth and sand in the earth pressure chamber is discharged by a discharge device comprising, for example, a combination of a screw conveyor and a belt conveyor. One method of measuring the amount (weight) of excavated soil is to install a pressure gauge under the belt of the belt conveyor and convert the pressure acting on this pressure gauge into the weight of soil.In this case, the tension of the belt is Since the amount of slack changes depending on the size, there is a drawback that the measured value fluctuates.

There is also a synchronized oscillator equipped with a rotating member attached to the discharge port of the screw conveyor, which converts the number of revolutions of the rotating member rotated by the sediment flow into the weight of sediment. There was a drawback that the error was large.

Furthermore, there is a method in which a load cell is installed near the entrance of the shaft, and the weight of the soil is measured by placing the cart on the load cell while the transport cart is transporting the earth and sand.
In this case, it is not possible to continuously measure the amount of soil during excavation,
The drawback was that there was a delay in responding when the amount of soil increased due to landslides, etc.

This invention eliminates the conventional drawbacks as mentioned above,
The purpose of the present invention is to provide a measuring device that can continuously measure the amount of earth and sand during excavation and has high measurement accuracy.

That is, the present invention provides an earth pressure type shield excavator having an earth pressure chamber defined at the front end and equipped with a discharge device for discharging excavated soil from the earth pressure chamber. The earth and sand transport vehicle that receives earth and sand is equipped with a load cell that can be mounted, a measuring device that follows the excavation movement of the shield excavator is provided, a member is provided on the shield excavator that measures the excavation distance, and the load cell The present invention is characterized in that a member is provided which inputs each output signal of the excavation distance measuring member and calculates and displays the amount of excavated earth and sand relative to the excavation distance.

The invention will be explained below with reference to illustrated embodiments.

As shown in Figure 1, earth pressure type shield excavator 1
is equipped with a cutter 3 and a partition wall 4 at its front end to partition an earth pressure chamber 2, and earth and sand excavated by the cutter 3 is retained in the earth pressure chamber 2 in order to counteract groundwater pressure. . A screw conveyor 7 is connected to the earth pressure chamber 2 at the open end of the cylinder 5, and has a screw 6 housed in a cylinder 5 with one end open and the other end closed. A belt conveyor 9 is arranged nearby, and the screw conveyor 7 and the belt conveyor 9 constitute a discharge device.

An excavated soil amount measuring device 11 is disposed below the discharge section 10 (right side in FIG. 1) of the belt conveyor 9. The measuring device 11 has a large number of segments 12
The frame 14 is equipped with a frame 14 that can run on a rail 13 laid within a primary lining consisting of a
is connected to the shield excavator main body 1' via a wire 15, so that the measuring device 11 moves in the excavation direction following the excavation of the shield excavator 1. A plurality of load cells 16 are installed on the frame 14 at appropriate intervals as shown in FIGS.
A support stand 18 having a number 7 is placed thereon. An earth and sand transport cart 19 running along the rails 13 can be mounted on the support stand 18, and the load applied to the support stand 18 is shared between each load cell 16.

Each load cell 16 outputs an electric signal according to the shared load, these electric signals are input to an amplifier 20 and summed, and the amplifier 20 outputs an FM radio signal according to the total load applied to the support base 18, This FM radio signal is input to the calculation display 21. A dummy jack 22 that displaces in synchronization with a propulsion jack (not shown) is mounted on the main shield excavator body 1'.
The stroke of the dummy jack 22, that is, the digging distance of the shield excavator 1, is detected by a detection member (not shown), and its signal is input to the calculation display 21. The calculation display 21 is adapted to integrate the signals from the amplifier 20 and display the resulting value in relation to the excavation distance.

Next, the function of the above-mentioned measuring device will be explained along with its usage.

Excavation is normally performed for each length of one ring of the segment 12, and at the start of the excavation, the earth and sand transport cart 19 is placed on the support stand 18, and at that time, the value of the load meter 16 indicated by the calculation display 21 is set to zero. shield excavator 1
During excavation, earth and sand are discharged by the screw conveyor 7 and the belt conveyor 9 while maintaining the earth pressure in the earth pressure chamber 2 at a predetermined value, and the earth and sand is transferred from the discharge section 10 of the belt conveyor 9 to the earth and sand transport cart 19. The weight of the object is measured by the load meter 16, and the integrated value of the measured values is displayed on the calculation display 21. At this time, the measuring device 11 moves on the rail 13 as the shield excavator 1 excavates, so that the measurement of earth and sand is continuously performed. Furthermore, since a signal corresponding to the stroke of the dummy jack 22 is input to the calculation display 21, the calculation display 21 displays the amount of excavated earth and sand relative to the excavation distance of the shield excavator 1, as shown in FIG. It will be done.

In the above description, the measuring device 11 is connected to the wire 1
5, it was connected to the shield excavator body 1' and moved to follow the shield excavator 1.
The measuring device 11 may be self-propelled. In addition, although the measuring device 11 is disposed below the belt conveyor 9, if the screw conveyor 7 has a relatively long conveyance distance and the belt conveyor 9 is unnecessary, it is possible to The measuring device 11 may be disposed at. In addition, various modifications can be made to this invention.

As described above, according to the present invention, since the measuring device that follows the excavation movement of the shield excavator is provided below the discharge part of the earth and sand discharge device, the excavated earth and sand are continuously and without time delay as the shield excavator excavates. The amount can be measured, and therefore, if a collapse of the ground or over-excavation occurs, it can be quickly detected, allowing the excavation work to be carried out safely.

In addition, the shield excavator is equipped with a member that measures the excavation distance, and a member that inputs the output signals of the load meter and the excavation distance measurement member to calculate and display the amount of excavated earth and sand relative to the excavation distance. As a result, the amount of excavated soil that changes sequentially can be immediately detected in relation to the excavation position. Therefore, if a collapse of the ground or over-excavation occurs, the location can be accurately and quickly determined from the excavation distance. It can be identified, and countermeasures such as chemical injection can be quickly taken.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view showing an embodiment of the present invention;
FIG. 2 is a side sectional view of a main part of the same as the above, FIG. 3 is a front sectional view of the same, FIG. 4 is a plan view of the same, and FIG. 5 is a diagram showing an example of a measurement display. DESCRIPTION OF SYMBOLS 1... Shield excavator, 1'... Shield excavator main body, 2... Earth pressure chamber, 5... Screw conveyor, 9... Belt conveyor, 11... Excavation soil amount measuring device, 15... Wire, 19... Earth and sand transport trolley, 22... Dummy jack.

Claims (1)

[Claims] 1. In an earth pressure type shield excavator that has an earth pressure chamber divided at the front end and is equipped with a discharge device for discharging excavated soil from the earth pressure chamber, an earth pressure chamber is provided below the discharge section of the discharge device to receive the excavated soil. The transport truck is equipped with a load meter that can be mounted, a measuring device that follows the excavation movement of the shield excavator is provided, a member is provided on the shield excavator that measures the excavation distance,
An apparatus for measuring the amount of excavated earth and sand in an earth pressure type shield excavator, further comprising a member that inputs each output signal of the load meter and the excavation distance measuring member to calculate and display the amount of excavated earth and sand with respect to the distance of excavation.