JPH0663257B2 - Mud pumping device - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to a mud pressure-feeding device for pressure-fed mud such as dredged sludge to a remote place through a mud pipe.

[Background of the Invention] Generally, in dredging of bottom sediment such as sludge, the amount of sludge dredging per unit position is increased to shorten the construction period, and the water contained in the dredged sludge is reduced to reduce the amount of water. In recent years, it has been required to speed up the drying of sludge that has been dumped in a landfill and to solidify the ground in a landfill.

In order to satisfy such demands, therefore, a dredging facility has been proposed in which the dredging mud is pumped from the dredging place to the land or the like by compressed air with compressed air.

FIG. 4 shows an example of such dredging equipment. This dredging facility is suitable for dredging in inland areas such as small and medium rivers, canals, reservoirs, and marshlands. From a backhoe 3 for excavating objects, a mud sorting unit 4 for sorting and crushing excavated sludge into a pudding-like fluid, and a set of two mud feeding tanks 5a, 5b for alternately pumping and storing sludge. And a belt conveyor 6 that conveys sludge discharged from the mud pressure sorting tank unit 5 to the mud pressure feeding tank unit 5, and a power unit including an air compressor 7a, a generator 7b, and an air receiver tank 7c. It is mounted and the power transmission pipe 8 is connected to the mud pressure feed tank unit 5.

Deposits such as sludge excavated by the backhoe 3
It is thrown into the sorter 9 of the mud sorting and crushing unit 4, and large-sized deposits, empty cans, fishing nets, etc. are sorted by the screen 9a, and then placed in the rotary drum cage 10a of the trommel type crusher 10 following the sorter 9. Be transported. Since mud is pumped by compressed air through the mud pipe 8 and lacks in fluidity, pipe clogging tends to occur in the middle of the mud. Therefore, the rotary drum cage 10a is crushed into a pudding-like fluid, and then the belt is crushed. The conveyor 6 alternately drops and stores from above the mud pressure feeding tank unit 5 into the mud pressure feeding tanks 5a and 5b. When the mud pumping tank 5a is fully filled with mud, compressed air is supplied to the mud pumping tank 5a to pump the mud to a remote place through the mud feeding pipe 8, and in the meantime. Mud is stored in the other mud pressure feed tank 5b.

By the way, in such a dredging facility, since the mud is continuously pumped by the mud pressure-feeding tank unit 5, the dredging mud has a high treatment capacity, and the mud is pumped by compressed air. It has a feature that the water content in the conveyed mud can be extremely reduced, but since the mud is supplied to the pressure-feeding tank unit 5 via the belt conveyor 6, the mud-raising and crushing unit 4 and the pressure-feeding tank unit 5 are included. The distance between the and the equipment has become long, which has led to an increase in the size of the entire equipment.

Therefore, it was not suitable for dredging narrow rivers.

[Object of the Invention] The present invention has been made in order to solve such a problem, and selects mud excavated by an excavator such as a hopper, and then supplies it to a pressure-feeding tank unit at a short distance. In addition, by making the entire device compact, it is possible to mount mud pumping on a barge of a size suitable for dredging work of a river with a comparatively narrow river, or a vehicle that can run a mudflat on soft ground etc. The purpose is to provide a device.

[Summary of the Invention] The mud pressure feeding device of the present invention alternately feeds mud to a plurality of tanks horizontally arranged in parallel, and feeds compressed air to a tank filled with mud to feed mud in the tank. In a mud pressure feeding device that feeds through a mud pipe, a screw conveyor for mud transportation that extends along the length direction of the tank and has a hopper for feeding mud in the upper part of the transport upstream side, and the upper part of each tank And a mud supply valve for controlling the supply of mud to the tank by being connected to the conveying end side of the screw conveyor, and the mud supply valve,
In addition to having a valve body that communicates with the tank, the conveying end of the screw conveyor faces the inside of a cylindrical portion whose upper end is closed, and is arranged so as to face the opening end and is opened and closed by driving means by a driving means. An air pipe for feeding mud is attached to the tubular portion.

Embodiments of the Invention The present invention will be described in detail below based on embodiments shown in the drawings.

FIG. 1 is a plan view showing an embodiment of the mud pressure feeding device according to the present invention, FIG. 2 is a side sectional view of FIG. 1, and FIG. 3 is a right side view of FIG.

In the figure, 20 is a horizontally arranged screw conveyor,
First with a right-handed screw-turning fin 202 inside the casing 201
A screw 203 and a second screw 205 having a fin 204 around the left screw are arranged. The first screw 203 and the second screw 205 are connected to each other outside the casing 201 by gears 206 and 207 which are fixed to their respective shafts and mesh with each other, so that a rotational force in the direction of arrow a is applied to the first screw 203 by a hydraulic motor, an engine ( By applying via a coupling 80 (not shown), they rotate in the directions facing each other. An opening 208 is provided at the top of the casing 201, and the opening 20
Muddy soil is dropped and supplied by an excavator such as a backhoe from a hopper 209, which is attached to No. 8 and has a lattice-shaped screen (not shown) vibratably attached to the upper opening, and the supplied muddy soil is The sheet is conveyed by the first screw 203 and the second screw 204 toward the conveying end side on the right side in FIG. At the unloading end of the screw conveyor 20, in order to supply the conveyed mud in a dense state to a mud pressure-feeding tank unit, which will be described later, a throttle short pipe 30 having a narrowed cross-sectional area is connected. If the cross-sectional shape of the narrowed chord tube 30 is vertically symmetrical with respect to the axis of the chord, the mud, pebbles, gravel, and the like accumulate in the lower inclined portion, and therefore only the upper pipe wall 301 is provided in this embodiment. Is inclined so that the lower pipe wall 302 has a flat surface that matches the lower portion of the casing 201 of the screw conveyor 20. 40 is the first tank 401 in which two units are horizontally arranged in parallel
And a mud pressure feed tank unit consisting of the second tank 402,
The first tank 401 and the second tank 402 are provided at their upper portions with openings 403 for supplying mud and compressed air, respectively, and each opening 403 is provided with a mud supply switching valve described below. First tank 401 and second tank 4
02 is formed in the same structure, and the tank described below will be described only for the first tank 401. First tank 4
In the inside of 01, the both ends are bearings 404, 404 along the length direction.
A stirring shaft 405 rotatably supported by is attached to a large gear 406 fixed to one shaft end and a small gear 408 attached to a hydraulic motor 407 via a chain 409. The stirring shaft 405 is rotationally driven by the driving force.
The stirring shaft 405 has a plurality of stirring blades 410 along its length.
The agitating blade 410 prevents the mud from accumulating at the bottom of the tank by agitating the mud in the tank. Reference numeral 411 is a mud discharge pipe extending rearward from the rear end of the tank bottom, and the first mud discharge valve 50 that is remotely operated is attached to the discharge end. A similar second mud discharge valve 51 is attached to the mud discharge pipe of the second tank 402.

Reference numeral 60 denotes a mud feeding pipe, one end of which branches into two branches, and the branch pipes 61 and 62 are connected to the first mud discharge valves 51 and 52, respectively.

70 is a first mud supply valve attached to the first tank 401, 71
Is a second mud supply valve attached to the second tank 402, and these first and second mud supply valves 70 and 71 are formed in the same structure. The description of the mud supply valve below is given in the first mud. Supply valve 70
The description will be omitted, and the description of the structure of the second mud supply valve 71 will be omitted.

The first mud supply valve 70 has a cylindrical main body 701 whose upper end is closed.
Compressed air pipe 702 for supplying compressed air and air vent pipe 70 on the peripheral wall of
3, the wash water supply pipe 704 and the earth pressure sensor 705 are attached, the mud supply pipe 706 is inserted into the side wall of the valve body 701, and the mud supply pipe 706 is arranged so as to face the opening end 706a. A disk-shaped valve body 707 that closes the valve is provided. The mud supply pipe 706 is connected to the choked short pipe 30, and the connection end of the mud supply pipe 706 of the choked short pipe 30 is closed, and the mud supply pipe 706 of the first mud feed valve 70,
The mud supply pipe 706 ′ of the second mud supply valve 71 is connected, and the mud from the screw conveyor 20 is fed to both mud supply pipes 706,
706 'can be supplied. A valve rod 708 is horizontally attached to the back of the valve body 707, and the valve rod 708 is supported by a valve rod support device 709 having a sealing mechanism so as to be movable in the horizontal direction. Reference numeral 710 is a hydraulic cylinder connected to the extended end of the valve rod 708, and the valve body 707 is opened via the valve rod 708 at an open position separated from the open end 706a of the mud supply pipe 706 shown in FIG. The opening end 706a is moved to and from the closed position to supply and stop the mud to the tank. This hydraulic cylinder 710 operates when the earth pressure sensor 705 detects that the mud in the first tank 401 is full, moves the valve body 707 to the closed position, and the mud from the mud supply pipe 706 is the first. The supply to the inside of the valve body 701 of the mud supply valve 70 is stopped. When the valve body 707 moves to the closed position, compressed air is supplied from the compressed air pipe 702 into the valve body 701, and the mud in the first tank 401 is supplied to the mud feed pipe 60 via the mud discharge pipe 411. It is discharged from the discharge end of the mud pipe 60. At this time, the first mud discharge valve 50 is open, and the air vent valve 90 attached to the air vent pipe 703 is closed. And the first tank
When the soil pressure sensor (not shown) provided in the first tank 401 detects that all the mud in the 401 has been discharged, the supply of compressed air to the compressed air pipe 702 is stopped, and
The hydraulic cylinder 710 is operated to move the valve body 707 to the open position to supply the mud into the first tank 401. that time,
The air vent valve 90 that is remotely operated to vent the air in the first tank accompanying the supply of mud is opened, and the air in the first tank 401 is released to the outside of the tank. In order to reduce the noise caused by the air released when bleeding the first tank 401,
In this embodiment, a silencer 91 is provided on the discharge side of the air vent valve 90. Also, when closing the valve body 707, the valve body 707 and the mud supply pipe 70
In this embodiment, a rubber sheet 707a is attached to the surface of the valve body 707 in order to more reliably close the open end 706a of the valve 6.

On the other hand, after completion of the mud pressure feeding work, since mud adheres to the inner wall surface of the valve body 701 and the valve body 707, the cleaning water is supplied from the cleaning water supply pipe 704 to the inside of the valve body 701 and adhered. I try to wash off the mud. During the mud pressure-feeding work, when the closing property of the valve body 707 is reduced, the cleaning water is supplied immediately before closing the valve body 707 to wash off the mud adhered to the valve body 707, thereby removing the valve body 707. The occlusive property can be maintained.

The structure of this embodiment has been described above. Next, its operation will be described.

In the following description, the first and second mud supply valves 70 and 71
"Open" means that the valve body 707 is in the open position and the air vent valve 90 is open, and the first and second mud supply valves are also open.
70 and 71 being “closed” means that the valve body 707 is in the closed position, the air vent valve 90 is closed, and compressed air is supplied from the compressed air pipe 702 into the valve body 701.

The mud is thrown into the hopper 209 by an excavator such as a backhoe. At this time, the massive mud is applied to the grid-shaped screen, and the mud passing through the screen is dropped and supplied into the casing 201 of the screw conveyor 20. The mud on the screen is crushed by the vibration of the screen and dropped into the casing 201 to be supplied.

The mud dropped into the casing 201 of the screw conveyor 20 is supplied with the first screw 203 and the second screw 205.
Is conveyed and is squeezed densely by the squeeze short tube 30 to enhance the conveying property.

The mud from the narrow choke pipe 30 can be supplied to the first mud supply valve 70 and the second mud supply valve 71 through the mud supply pipes 706 and 706 ′, but the first tank 401 and the second mud pressure feeding tank unit 40 can be connected to each other. In order to operate alternately with the tank 402, for example, when the first mud supply valve 70 is switched to "open", the second mud supply valve 71 is switched to "closed", and accordingly the first mud discharge is performed. The valve 50 is closed, the second mud discharge valve 51 is open, and while the mud is being supplied to the first tank 401, the second mud discharge valve 51 is opened.
The mud in the tank 402 is pressure-fed to the mud pipe 60 by the compressed air supplied through the second mud supply valve 71. Second tank
The time required for all the mud in the 402 (first tank 401) to be discharged is set to be approximately equal to the time required for the mud in the first tank 401 (second tank 402) to become full.
When the valve opening of the mud discharge valve 51 (first mud discharge valve 50) is adjusted and all the mud in the second tank 402 is discharged,
The second mud supply valve 71 is switched to "open" and the second
The mud discharge valve 51 is closed. When the mud in the first tank 401 is full, the first mud supply valve 70 is switched to “closed”, the first mud discharge valve 50 is opened, and the mud is supplied to the second tank 402. In addition, the mud in the first tank 401 is pressure-fed to the mud feed pipe 60 by the compressed air supplied through the first mud feed valve 70, and by repeating this operation continuously, the mud passes through the mud feed pipe 60. Will be continuously pumped.

As described above, according to the present embodiment, the first mud supply valve 70 and the second mud supply valve 71 are respectively provided above the first tank 401 and the second tank 402 which are horizontally arranged in parallel with each other. And a screw conveyor 20 equipped with a hopper 209 for charging mud is arranged along the length direction between the first tank 401 and the second tank 402.
Since the mud discharge side of 20 and the first mud supply valve 70 and the second mud supply valve 71 are connected via the mud supply pipes 706 and 706 ', the entire apparatus can be made compact,
Moreover, the width of the entire device can be reduced.

In the present embodiment, the mud supply valves 70, 71 are provided with an air vent pipe 7
Although 03 and the compressed air pipe 702 are provided, the air vent pipe 703 and the compressed air pipe 702 may be directly provided in the tanks 401 and 402.

[Effects of the Invention] As described above, according to the present invention, the mud supply valve for alternately supplying the mud from the screw conveyor to the tank in order to pressure-feed it is configured by the tubular portion forming a part of the tank. In addition, since the air pipe for pressure feeding is provided in this cylindrical portion, the mud can be reliably supplied to the tank.

In addition, since the air supply pipe is not provided in the tank body for supplying the compressed air, but the air supply pipe is provided in the tubular portion forming the mud supply valve, the tank diameter is made small and the device is elongated. If you want to make the whole compact, you do not have to worry about the installation position of the air supply pipe, therefore,
For example, it can be easily mounted on a barge capable of moving in a river having a relatively narrow river width, a vehicle capable of self-propelled a mudflat of soft ground, and the like.

[Brief description of drawings]

1 to 3 show an embodiment of the present invention, FIG. 1 is a plan view, FIG. 2 is a side sectional view, and FIG. 3 is a right side view. FIG. 4 shows a plan view of the dredging equipment. 20: Screw conveyor, 30: Short throttle pipe 40: Mud pressure feed tank unit 50,51: Discharge valve, 60: Mud feed pipe 70,71: Mud supply valve 90: Air vent valve, 91: Silencer

Claims (1)

[Claims] 1. A mud in which mud is alternately supplied to a plurality of tanks horizontally arranged in parallel, compressed air is supplied to a tank filled with mud, and the mud in the tank is pressure-fed through a mud pipe. In the pressure feeding device, a screw conveyor for carrying mud having a hopper for feeding mud at the upper part on the upstream side of the conveying and extending along the length direction of the tank, and provided at the upper part of each tank, of the screw conveyor. And a mud supply valve that is connected to the conveying end side to control the supply of mud to the tank, and the mud supply valve conveys the screw conveyor into a cylindrical tube portion having an upper end closed to communicate with the tank. And a valve body which faces the end and is opposed to the opening end and which is driven by a driving means to open and close the opening end, and an air pipe for pumping mud is attached to the tubular portion. Mud pumping device.