JPH0342159Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] The present invention is used to transport discharged soil to a loading position on a truck or the like when excavating a tunnel or the like using the shield method. Regarding soil conveyance equipment.

[Conventional technology] As shown in Figure 2, the shield method uses a shield machine 21 to excavate tunnels while preventing the ground from falling.The excavated soil originally contains moisture, and its transport is carried out using belt conveyors, etc. Since it is difficult to do so, a slurry pump 22 such as a concrete pump is used to pump the soil through the soil feeding pipe 23.

In this case, in order to carry out smooth transportation, a water supply ring 24 is provided in the middle of the soil transport pipe 23 to supply water to the discharged soil, thereby reducing the frictional resistance between the pipe and the discharged soil. If this amount of water supply is too large, the track 25
On the other hand, if the amount is too small, the slurry pump 22 will be overloaded and cause a breakdown. This appropriate value is not constant depending on the soil quality and the amount of pumping per hour, and conventionally, the operator determined it while observing the operating status of the machine.

[Problems that the invention aims to solve] However, in the conventional technology as described above, it is difficult to set the amount of water supplied to the discharged soil to an appropriate value by relying on the operator's intuition, and there is a risk of excess or deficiency due to judgment errors. In particular, in order to prevent slurry pump failure, there was a tendency to pour in too much water, which required time and effort to remove water in subsequent processes. This effect also increases the burden on the operator.

[Means for Solving the Problems] In order to solve the above-mentioned problems, the present invention has a slurry pump that pumps discharged soil, and a slurry pump that is attached to the soil discharge piping connected to the discharge side of this slurry pump. a water supply device that provides fluidity to the discharged soil by supplying water through the water supply ring, a pressure detection means that detects the pressure of the working fluid of the slurry pump and estimates the transfer pressure of the soil in the piping; The present invention is configured to include a control device that controls the amount of water supplied by the water supply device based on the water supply device.

[Function] According to such a conveyance device for discharged soil, the amount of water supplied can be controlled so that the pressure inside the pipe reaches a preset appropriate value, so that the amount of water required to maintain smooth conveyance is not excessive. There will be no shortage of supplies. Therefore,
There is no failure of the slurry pump due to overload, and there is no increase in the burden on the next process due to excessive water supply. In addition, the water supply ring supplies water directly into the discharge pipe, so
Mixing of soil and water is done uniformly without using any special mixing equipment. The transfer pressure of earth and sand in the piping is indirectly detected from the working fluid pressure of the slurry pump.

[Example] Hereinafter, an example of the present invention will be described with reference to the drawings. Incidentally, the portions shown in FIG. 2 are summarized as they are in this embodiment, so the explanations of the duplicated portions will be omitted.

In FIG. 1, reference numeral 1 denotes a slurry pump for pumping discharged soil, and in this example, a slurry pump configured such that two cylinders 2, 2 alternately suck in and push out soil is employed. Reference numeral 3 indicates a water supply device attached to the discharge side of the slurry pump 1 to give fluidity to the discharged soil, 4 indicates a soil transport pipe that transports the discharged soil to the truck loading position on the ground surface, and 5 indicates a soil transport pipe 4. This is a pressure detection means (pressure switch) for detecting the pumping pressure of the discharged soil in the slurry pump 1, and indirectly detects the pressure in the soil feeding pipe 4 using the hydraulic pressure of the hydraulic drive circuit of the slurry pump 1.

As shown in FIG. 2, the water supply device 3 includes a water supply ring 7 having a plurality of spouts 6 opened on the inner surface toward the downstream side, and a water supply pipe 8 communicating with the spouts of the water supply ring 7. , water supply tank T
It consists of a water supply pump 9 that supplies water from the slurry to the water supply pipe 8, and a pipe 10 that connects the water supply ring 7 to the discharge port 1a of the slurry pump 1.

A plurality of pressure switches 5 having different set pressures are connected to the discharge side piping L of the hydraulic pump F in the hydraulic circuit H that drives the slurry pump 1, and detect the pressure in the piping L in stages and send signals. It is beginning to emit.

A control device 11 is provided which controls the amount of water supplied by the water supply pump 9 based on the pressure detected by the pressure switch 5. This control device 11 is composed of a microcomputer, and stores the set value of the water supply amount of the water supply pump 9 corresponding to the set value of each pressure switch 5, and determines which signal output of the pressure switch 5 is input. The amount of water supplied by the water supply pump 9 is changed in accordance with the input signal from the pressure switch 5. For example, in the control device 11, the appropriate setting value of the pressure switch 5 is set to 150.
Kg/ ^cm2 , if the detected pressure is less than 100Kg/ ^cm2 , the rotation speed of the drive motor of the water supply pump 9 is lowered by a signal from a predetermined pressure switch 5 set lower than this appropriate setting value. When the detected pressure is 200Kg/cm2 or ^more , the rotation speed of the drive motor is increased by a signal from a predetermined pressure switch 5 set higher than the appropriate setting value to reduce the water supply amount. is increasing.

The mounting position and set pressure of the pressure switch 5 vary depending on the length and diameter of the soil transport pipe 4 and the height difference from the discharge position, and are determined experimentally or empirically. Further, since the value of the detected pressure changes depending on the timing with respect to the discharge cycle of the slurry pump 1, the peak value is adopted.

In this example, pressure detection and control of the drive motor of the water supply pump 9 are performed in stages, but either or both may be controlled continuously.

[Effects of the invention] This invention has a slurry pump that pumps discharged soil,
There is a water supply device that supplies water through a water ring attached to the soil discharge pipe connected to the discharge side of the slurry pump to give fluidity to the discharged soil, and a water supply device that detects the working fluid pressure of the slurry pump and drains the soil inside the pipe. The configuration includes a pressure detection means for estimating the transport pressure of the earth and sand, and a control device for controlling the amount of water supplied by the water supply device based on this detected pressure, so that the amount of water to maintain smooth transport is accurate. supplied,
This has excellent effects in that there is no failure of the slurry pump due to overload, and there is no increase in the burden on the next process due to excessive water supply. Furthermore, since the water supply ring supplies water directly into the discharge pipe, the soil and water are evenly mixed without the need for special mixing equipment.
In addition, the transfer pressure of earth and sand in the piping is indirectly detected from the working fluid pressure of the slurry pump, so
Compared to the case where it is installed directly in the pipe, it is possible to obtain accurate values with a simpler method.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing the configuration of an embodiment of the present invention, FIG. 2 is a sectional view of a water supply ring, and FIG. 3 is a schematic diagram showing a preferred shield construction method to which the present invention is applied. 1...Slurry pump, 2...Water supply device, 3...
...Piping, 5...Pressure detection means (pressure switch),
7...Water supply ring.

Claims (1)

[Scope of Claim for Utility Model Registration] A slurry pump that pumps discharged soil, and a water supply that provides fluidity to the discharged soil by supplying water through a water ring attached to the soil discharge pipe connected to the discharge side of this slurry pump. a pressure detection means for detecting the working fluid pressure of the slurry pump and estimating the transfer pressure of earth and sand in the piping; and a control device for controlling the amount of water supplied by the water supply device based on the detected pressure. A conveying device for discharged soil characterized by the following.