JPS59229570A - Method and apparatus for conditioning quality of excavated mud - Google Patents

Abstract

PURPOSE:To condition the quality of excavated mud immediately at the site of excavation by adequately controlling conveying speed in the apparatus and the amt. of solidifying or mixing agent to be fed in accordance with the viscosity of mud ejected with progress of excavation. CONSTITUTION:When mud is continuously conveyed with the first screw conveyor 11 to the second screw conveyor 51, bridging due to high viscosity mud is prevented by passing it through a bridge breaker 18, and it is conveyed to the second conveyor 51 without delay. The second conveyor 51 is controlled in terms of rotation speed by detecting the quality of the conveyed mud, such as viscosity, with a torque meter 58 fixed to the shaft of the conveyor 51. A mixing or solidifying agent for controlling the viscosity of the mud or its solidification is fed in a predetermined rate to a mix ing and stirring device 30 to condition the mud for a necessary use and to enable reuse of it.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for improving the soil quality of excavated soil and an apparatus therefor, which immediately improves the soil quality of excavated mud generated at a construction site or the like and reuses it as a construction material.

For example, the mud discharged from the excavation of roads is transported and reused in some way.

However, the properties of the discharged mud are not always stable depending on the location and the excavation period. Therefore, reuse is difficult or impossible unless the soil is improved. In other words, even if the fluidity index of the mud is used as a standard, the fluidity and viscosity of "C" at the same water content ratio will change completely depending on the difference in the fluidity limit and plasticity limit of the mud that is the raw material for mud. The degree of solidification strength varies depending on the admixture.

Therefore, it is necessary to set appropriate mixing and cross-conducting conditions according to each excavation site, and in addition, consideration must be given to the use in narrow spaces like conventional mud feeding equipment and kneading equipment for work in narrow still roads. You cannot use something that has not been created.

In view of the above, the present invention provides improved construction debris that is compatible with the purpose of use by solidifying changes in the mud discharged as the excavation progresses or by incorporating an appropriate amount of a mixed phase agent, and excavation that can be reused in 1. The main purpose of this study is to propose a soil improvement method and a soil improvement device that understands the viscosity of mud with different properties and appropriately adjusts the conveyance speed and amount of solidification or admixture.

An embodiment of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a schematic side view showing an example of an apparatus for carrying out the method of the present invention. 1 is a first truck, and 2 is a second truck, which run on rails laid within the excavation path. 1st
On the trolley 1 is a transport device 1 that guides the mud raw materials to a mixing and stirring device.
On the second truck 2, a storage device 20 for storing admixtures for improving the soil quality of mud raw materials and a mixing and stirring device 30 are installed, respectively.

The transport device 10 includes a first screw conveyor 11 and a second screw conveyor 11 to which raw materials such as clay lumps, mud, and sand collected from the ground or discharged from the excavation site are supplied from an excavator or the like by a conveyor or a pump. It is composed of Yukon Bear 51 and others. The first screw conveyor 11 is rotationally driven by a drive motor 12 provided on a saddle 3 on the first truck 1. This conveyor 11 has a rotating shaft 16 disposed on a mud receiving plate 13 having a gentle depression angle from the raw material input side to the conveyance side.
The chain 15 is connected to the motor 12 via the universal joint 14 so that the driving force from the motor 12 is transmitted by the chain 15 .

By providing the universal joint 14, the tip of the conveyor shaft 11a becomes free when large blocks of earth and sand are supplied, so that no unreasonable resistance is applied to the conveyor shaft 11a, and therefore no overload is applied to the drive motor 12. Load can be prevented. Furthermore, the reason why the conveyor shaft 11a is slightly inclined is to secure as large a volume of mud and sand as possible within a limited space.

The mud material transported by the first screw conveyor 11 is
It is subsequently supplied to the second screw conveyor 51. At this time, because the raw material is highly viscous and the angle of inclination of the first conveyor 11 is small, it cannot be smoothly transferred from the first conveyor 11 to the second conveyor 51, resulting in a bridge. ) phenomenon may occur, so in order to eliminate this situation, a vertical noddle type bridge player 17 is installed between the first conveyor 11 and the second conveyor 51. An endless scraper 17b and a vertical screw 17C are integrally provided on a vertical rotating shaft 17a. By rotating the breaker 170, even if the highly viscous mud supplied from the first conveyor 11 becomes a bridge, the material can be pushed into the second conveyor 51 without stagnation by the rotation of the screw 17C.

The second screw IJ knee conveyor 51 is a two-shaft closed screw conveyor, and is used to uniformly convey raw materials with different liquid indexes to the mixing and stirring process by changing the driving rotation speed. Fluctuations in the liquid index, that is, soil quality detection, are detected by installing a torque meter on the conveyor shaft and detecting changes in the torque meter, and adjusting the rotation of the conveyor. One shaft of the two-shaft conveyor 51 is of the main drive type, and the other shaft is moved in the axial direction so that mutual cleaning of the screws can be performed. This can prevent a reduction in the amount of conveyance caused by mud with a large X occupancy sticking to the screw.

One shaft 52 is connected to a shaft 54 provided horizontally on the first truck 1 via a universal joint 53, and the shaft 54 and drive motor 55
A chain belt is used to transmit the transmission between the shaft 56 and the shaft 56 connecting the two. 57 indicates a chain.

A torque meter 58 is interposed between the motor 55 and the shaft 56. Therefore, when the liquid index of the mud conveyed by the second conveyor 51 changes, the rotational torque of the motor 55 fluctuates depending on the viscosity of the screw and the mud. The rotation of the motor 55 is controlled by controlling the current or voltage of the motor.

FIG. 6 is a block diagram in which the rotational speed of the second screw conveyor is controlled by changing the indicated value of the torque meter when mud having different liquid indexes is introduced and conveyed.

The rotation speed of the second screw conveyor 51 is detected by a torque meter, processed by a signal conversion control calculation unit via a strain measurement conversion unit, and then frequency-converted by an inverter power unit to a motor 55. The configuration is adopted.

Note that a tachometer 59 for detecting the rotation of the screw compressor 510 can be provided at the end of the shaft 54. Tachometer 59 may include a rotary encoder and a digital counter.

As shown in FIG. 7, the other shaft 62 is configured to rotate by transmitting the rotational force of the one shaft 52 using a gear box 63 at the 4= portion of the tilting rail shaft. Reference numeral 64 indicates a power cylinder, which is fixed on a base 65 and is arranged so that its piston is driven parallel to the shaft 62. cylinder 6
As shown in FIG. 8, the piston 64a of No. 4 is
The other shaft 62, which is connected to a connecting part 66 that moves the second bearing 65, and whose one end is rotatable to the bearing 65 and whose thrust direction is regulated, is moved in the direction of arrow A by the expansion and contraction of the piston 64a. Gear device 67 for transmitting rotational force
are mated. Therefore, even if the other shaft 62 moves in the axial direction, the meshing state of one shaft 52 with the gear is maintained. In the figure, 68 indicates a casing of the gear device 67, and 67a indicates a gear. Therefore, when the highly viscous mud material is conveyed upward by the second screw conveyor 51 and sticks to the screw, the power cylinder 64 is actuated to move the other shaft 62 in the axial direction. By narrowing the distance between the double screws, sticky material can be removed and self-cleaning can be performed.

As shown in FIG. 1, the admixture storage device 20 stores the admixture or solidification agent transferred in one direction to the lower discharge side by a vertical screw conveyor 21 installed on the second truck 2. A fixed amount is supplied to the mixing and stirring device 30. Then, it is mixed with the mud and sand transferred by the second screw conveyor 51 to improve the soil quality. The screw conveyor 21 is chain driven by a motor 22. It is necessary to prevent the mixed or admixture agent transferred upward from colliding with the inner wall of the silo, and therefore it is leveled and conveyed by a chain scraper 24 provided within the silo 23. The chain scraper 24 is hooked on sprockets 25 at four positions provided on the side of the silo 2Ua, and the driving force of the motor 26 is transmitted to a shaft 25a provided by extending the sprocket 25 of the sentry 1 to the outside of the silo 20a. (See Figure 5).The mixture or admixture is sequentially supplied into the silo 20a, but a level switch 2T is provided at the top of the silo 2 (18) to prevent it from overflowing from the silo 20a. 27 is connected to a control circuit which stops the rotation of the motor 22 of the vertical screw conveyor 21 when a certain level is reached.

Blade feeder, 2 by chain scraper 24
As shown in FIG. 4, the admixture or solidifying agent brought to the 8 side is always stored at the inlet of the blade feeder 28 by the screw feeder 29 whose axis intersects with the inlet of the blade feeder 28. Then, a blade feeder 28 provided at the bottom of the silo 20a supplies a fixed amount to a mixing/stirring device 30 provided at the bottom of the silo 20a. Blade feeder 2
8, a fixed amount is dispensed by rotating blades provided radially on a rotating shaft rotatably attached to the bottom plate of the tank 20a. As shown in FIGS. 4 and 9, the mixing and stirring device 30 has a mud material input port at the top, a curved U-shaped bottom plate at the bottom, and two stirring shafts. It is arranged horizontally. A conveyor (shown by a two-dot chain line) is disposed at the lower part of the side wall 3Llb of the stirring tank 30a via the discharge port 30C. Two stirring shafts 32a.

The shaft end of 32b extends in the axial direction and is rotatably supported by a bearing 33 provided on the outside of tank 30a. Stirring shaft 3
2a and 32b, as shown in FIG. 9, are equipped with a plurality of flat stirring blades 35 vertically disposed via a base shaft 34 on the same rotational plane with an equal phase difference in the stirring tank 3Ua. Each of the stirring blades 35 is arranged in a large number in rows, with their rotating surfaces alternately superimposed on blades 35' similarly provided on the adjacent stirring shaft 32b at regular intervals in the axial direction of the shaft 32a.

As shown in FIG. 5, the rotational force of a motor 38 is transmitted to the stirring shaft 32b via a conductor 37 such as a chain belt. In addition, the bottom plate 30 (4°) with a U-shaped cross section is made of a flexible material to prevent foreign matter contamination accidents and city prevention, and the upper end is suspended from the frame 36. A variable speed motor is used to change the degree of kneading by changing the mixing ratio according to changes in soil quality.

As shown in FIG. 5, the conduction band 37 includes guide sprockets 39a, 39b arranged above and below and each shaft 32a, 32b.
It is hung on sprockets 32c and 32d provided at the ends of. Therefore, the shafts 32a and 32b can be rotationally synchronized in the same direction, or can be rotationally synchronized in the opposite direction. The upper guide sprocket 39α has a structure in which the shaft center moves up and down in case the chain becomes loose or hooked.

The shaft 39e is integrated with upper and lower core rods 39f via bearings, and a compression spring 39g always acts on the core rod 39f.

Next, the operation of the present invention will be explained. If the amount of input into the first screw conveyor changes to a larger or smaller amount than the preset amount, unless the number of revolutions of the second screw conveyor 510 and the number of revolutions of the blade feeder 28 are changed appropriately, mud may overflow from the conveyor or the conveyor It becomes idle.

Therefore, as shown in FIG. 10, a main setting device 71 is used to set the appropriate rotation speed of the second screw Z-conveyor 510 and the rotation speed of the blade feeder 28 corresponding to the preset input amount.
The main setting device 71 is guided to the proportional setting section 73 via the cutoff circuit 72, and the inverter drive circuits 74.7 for the second screw conveyor 51 and the blade feeder 28, respectively.
5. The switching circuit switches from the signal from the main setting device r1 to the upper limit mode or lower limit mode signal based on the signal from the ultrasonic detector 19 that detects the upper and lower limit levels that indicate input amount above or below a preset input amount. A level detection compatible setting section 76 is built-in or attached. Therefore, by supplying a signal indicating a level above or below a predetermined input amount to the switching circuit 72, the variable resistance control circuit is switched to the preset variable resistance control circuit in the mechanism recovery setting section II. The amplified signal is transmitted to each input unit/4
．． 75, and can increase or decrease the rotational speed of the second conveyor 51 and the blade tweeter 28.

Therefore, when the first conveyor 11 has an input amount reaching the limit level, the second conveyor 51 and the blade feeder 2
Maximize the rotation speed of 8! 11 vice 1 wholesale.

By the way, in excavation drainage, mud with a constant liquid index is not always supplied. For example, if the liquidity index value increases from a raw material with a predetermined liquidity index, it will be difficult to convey the material sufficiently without increasing the rotation speed of the screw conveyor. Must be supplied in large quantities. On the other hand, if the liquid index value becomes small, the conveyance capacity will be satisfied even if the rotation speed of the screw conveyor is reduced, but the rotation of the blade feeder will be lowered to reduce the amount of mixing or solidifying agent input from the blade feeder. There is a need.

Therefore, as shown in FIG. 11, a main setting/level setting switching circuit 81 is provided, and this circuit is connected to each drive circuit 83, 84 via a ratio setting switching circuit 82. Main settings/
The level J) constant switching circuit 81 is a circuit that switches the respective set voltage values for the main setting state indicating the normal supply level, the highest level state due to excessive supply, and the lowest level state due to insufficient supply. The ratio setting switching circuit 82 sets the rotation ratio ((corresponding voltage ratio is 1:
1, l:2...1:N, one circuit is selected as -J and input to each drive circuit 83.84. It is. Therefore, for example, when the fluidity index is 1.5 and the torque meter indicates 5, the second conveyor is assumed to be conveying the specified amount at 3 Qrpm, and when 5% solidifying agent is mixed therein, the flow rate is
Assuming that the rotation speed of the second conveyor is 3 rpm, if the quality of the mud changes and the torque meter shows a value of 3, it is assumed that the liquid index has increased, and the rotation speed of the second conveyor and By selecting an appropriate proportional circuit of the proportional setting switching circuit 82 in order to increase the number of revolutions of the blade feeder, it is possible to improve the soil quality so that it is always in a uniformly mixed state with predetermined kneading adjustment. When increasing or decreasing the preset amount of admixture or solidifying agent for the predetermined conveyance amount of the second conveyor, the ratio setting switching circuit 82 desired ratios can be switched and adjusted.

As described above, according to the present invention, when the mud is continuously conveyed to the second screw conveyor by the first screw conveyor, the mud is passed through a bridge breaker that breaks the bridges of the highly viscous mud, and the second screw conveyor The conveyance speed is changed according to the viscosity of the mud supplied to the Yukon Bear, and the conveyance speed is changed and an admixture or solidifying agent for adjusting the viscosity or solidification of the mud is mixed with the adjusted mud based on a preset ratio. The clay supplied to the mixing and agitating device improves the soil quality of the kneaded mud uniformly.For example, when excavating a road, mud whose clay quality changes from time to time can be artificially improved in a narrow space. By adjusting the liquid index, the soil quality can be improved for the desired use. That is, in order to adapt to all soil conditions, the ratio of the above-mentioned admixture or solidifying agent can be arbitrarily set in response to changes in soil quality, so that uniform soil quality can always be obtained. In addition, even if the viscosity makes it difficult to convey the material smoothly to the conveyor, it can be resolved by operating the bridge breaker as necessary, and it is possible to select conveyance conditions that are responsive to changes in soil quality.

Further, according to the present invention, in an apparatus for improving soil quality by mixing and agitating mud supplied by a screw conveyor with a mixing or solidifying agent, a bridge for destroying a bridge of mud supplied by a first screw conveyor is provided. Consisting of a breaker and a torque meter installed on the shaft of the second screw conveyor for changing the screw rotation speed of the second screw conveyor according to the viscosity of the mud supplied from the first screw conveyor. Therefore, the functions of this type of equipment are sufficient in a narrow space. It is possible to increase or decrease the rotation speed of the screw by directly understanding the viscous resistance during conveyance. Therefore, when mud material with a high moisture content is input, the rotation speed can be increased to prevent stagnation of conveyance capacity. It is possible to achieve the desired conveyance capacity in response to soils with different properties.

Furthermore, according to the present invention, a screw cleaning mechanism that is driven to move in the axial direction with respect to one shaft of the two-channel screw conveyor is provided on the other shaft, so that measures against sticking to highly viscous mud are sufficiently taken. obtain.

[Brief explanation of the drawing]

FIG. 1 is a line side view showing an example of the device of the present invention, and FIGS. 2, 3, and 4 are sectional views taken along lines ■-■, 1[1-1, and IV-IV in FIG. , FIG. 5 is a view taken along the line ■-■ in FIG. 1, FIG. 6 is a block diagram for explaining the rotation control of the second screw conveyor, and FIG.
The line arrow view, Figure 8 is the ■-■ line 1yr side view in Figure 7, Figure 9
The figure is a sectional view taken along the line -IX in FIG. 1, and FIGS. 10 and 11 are control block diagrams of the second screw conveyor and the blade feeder. 11,... first screw conveyor, 20... storage device for admixtures, etc., 21... vertical screw conveyor,
23... Silo, 24... Chain scraper, 2
8...Blade feeder, 30...Mixing stirring device,
32a. 32b... Stirring shaft, 35... Stirring blade, 51...
Second screw conveyor, 52...one shaft, 58...
...Torque meter, 62...Other shaft, 64...Power cylinder, 71...Main setting device, T2...Switching circuit,
73... Proportional setting section, 81... Main setting/level setting switching circuit, 82... Proportional setting switching circuit.

Claims (1)

[Claims] 1. When the mud is continuously conveyed to the second screw conveyor by the first screw conveyor, the mud is passed through a bridge breaker that breaks the bridges of the highly viscous mud, and the mud is transferred to the second screw conveyor. The conveying speed is changed according to the viscosity of the mud supplied to the mud, and a mixing or solidifying agent for adjusting the viscosity or solidification of the mud is mixed and stirred together with the adjusted mud based on a preset ratio. A method for improving the quality of excavated soil, characterized by uniformly improving the quality of mixed mud by supplying it into a device. 2. In a device that improves the soil to a predetermined quality by mixing and agitating mud supplied by a screw conveyor and a mixing or solidifying agent, a bridge breaker that destroys a bridge of mud supplied by a first screw conveyor; 1
Excavation characterized by comprising a torque meter provided on the shaft of the second screw conveyor for changing the screw rotation speed of the second screw conveyor according to the viscosity of the mud supplied from the screw conveyor Qa. Soil quality improvement equipment. 3. The soil improvement device for excavated soil according to claim 2, wherein a screw cleaning mechanism that is driven to move in the axial direction with respect to one shaft of the second screw conveyor is provided on the other shaft.