JPH05693U - High water content mud discharge device - Google Patents

Abstract

(57) [Summary] [Purpose] To quantitatively control the discharge of highly hydrous mud stored in the hopper. In addition, the trapping of water and mud will be ensured by eliminating the trapping of discharged mud. [Structure] Upper and lower two-stage gate valves 2 and 3 are provided near a discharge port of a hopper. The gate plates 20 and 30 are formed with through holes 20a and 30a at their tip ends, and the discharge control of the high water content mud is performed by the reciprocating motion of the gate plates 20 and 30. Further, a gate plate accommodating portion that surrounds the through hole side gate plate portion when the through holes 20a and 30a are located outside the communication passage is provided.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a discharge device which is capable of quantitatively discharging high-moisture content mud discharged from a construction site such as a shield work and an underground continuous wall construction site, and which is excellent in closure and watertightness.

[0002]

[Prior Art]

 Conventionally, as this type of discharge device, a device as shown in FIG. 7 or 8 has been generally used. In the discharge device shown in FIG. 7, hopper gates 51 and 52 which are rotatable around rotation shafts 51a and 52a as rotation centers are provided at the bottom discharge port of the hopper 50, and the hopper gates 51 and 52 are attached to the outer peripheral surface of the hopper 50. By rotating the hydraulic cylinders 53 and 54, the stored material in the hopper is discharged. Further, in the discharging device shown in FIG. 8, a gate plate 61 which is movable by a hydraulic cylinder or the like (not shown) is provided at the bottom discharge port of the hopper 60, and the stored matter in the hopper 60 is discharged by controlling the sliding of the gate plate 61. It is a thing. Further, in order to maintain airtightness and the like, the gate plate 61 may be double provided in the vertical direction.

On the other hand, in recent shield work, for example, the use of a mud pressure type shield construction method for stabilizing the cutting face by mixing an additive material that promotes plastic fluidization into the excavated soil has increased, and In many cases, pipes are transported from the shield face to the sediment hopper outside the mine using a sediment pump. In this method, as mentioned above, since the mud soil material mainly composed of clay minerals is added as a lubricant to the excavated residual soil, the excavated residual soil has a high water content and is easily fluidized. Further, this excavated mud is subjected to press treatment or chemical solidification in the subsequent treatment step to be discharged.

[0004]

[Problems to be solved by the device]

 First of all, however, in the case of the above-mentioned discharge device, the amount of discharged soil cannot be controlled because the amount of discharge cannot be controlled or is difficult, and the amount of supply to the solidification device is not constant and solidifies. There were problems that the mixing ratio of the material fluctuated, the physical properties of the solidified material were not uniform, and the work environment deteriorated due to the overflow when loading the truck.

Secondly, the discharging device is mainly intended for discharging powder and granules, and in the case of the high water content mud which is the discharging target in the present invention, the discharging device of the hopper gates 51, 52 is used. Since muddy water and mud flow out from the gap and the working environment deteriorates, it cannot be used appropriately for high water content mud. Also in the case of the slide gate type shown in FIG. 8, the mud is caught in the recessed groove 60a where the tip of the slide gate 61 fits, and the closing by the slide gate 61 becomes insufficient so that the closing property is improved. Also, there is a problem that the watertightness cannot be secured.

Therefore, the main problem of the present invention relates to the discharge of mud having a high water content, such as excavated mud from the shield face, in particular, the discharge amount from the hopper can be quantitatively controlled, and the closed chain and watertightness can be improved. It provides an excellent discharge device.

[0007]

[Means for Solving the Problems]

 The above-mentioned problem is a discharge device that has upper and lower two-stage gate plates near the discharge port of the hopper, and controls the opening and closing of the communication path to the discharge port by the reciprocating movement of the gate plates. , A through hole is formed on one side of the movement direction line and a closed surface is formed on the other side without a through hole, and the through hole or the closed surface is formed by the reciprocating movement of the gate plate. It is possible to solve the problem by controlling the discharge of the high-moisture content mud by arranging the gate plate in each of the above positions and providing a gate plate accommodating portion surrounding the through hole side gate plate part when the through hole is located outside the communication passage.

[0008]

[Action]

 The gate plate according to the present invention has a through hole and a closing part, and the reciprocating movement of the gate plate causes the through hole and the closing part to be respectively positioned in the communication passages of the hopper discharge ports, thereby controlling the discharge. And a gate plate accommodating portion surrounding the through hole side gate plate portion when the through hole is located outside the communication passage. Therefore, the trapped mud when the communication passage changes from the open state to the closed state is temporarily stored in the closed space between the through-hole portion of the gate plate and the gate plate storage portion. As it moves, it moves to the side of the communication passage and is discharged, so mud is not trapped, the gate is closed and watertight, and muddy water is not scattered. In addition, it has upper and lower two-stage gates in the discharge direction, and a fixed amount of discharge can be performed by the linked opening / closing control between these two gates.

[0009]

【Example】

 Hereinafter, the present invention will be described in detail with reference to the embodiments shown in the drawings. In FIG. 2, an exhaust duct 1a below the hopper 1 is provided with upper and lower two-stage gate valves 2 and 3. As shown in detail in FIG. 3, the gate valves 2 and 3 are provided with gate plates 20 and 30 for opening / closing the passage of the discharge duct 1a. The gate plates 20 and 30 are adapted to reciprocate when the hydraulic cylinders 4 and 5 connected to the base ends thereof are expanded and contracted. In addition, as shown in FIG. 4, the gate plates 20 and 30 have a closed portion (non-processed portion) in which a through hole is not formed in the base half of the plate in a plan view, and the tip end thereof is formed. A through hole 20a is formed on the side, and when the closing portion overlaps the communication passage of the discharge duct 1a as the gate plates 20 and 30 slide, the discharge of mud is closed, and the through hole 20a is discharged. When it overlaps with the communication passage of 1a, it forms a communication portion in the vertical direction and discharges mud. The ab side of the through hole 20a is formed in a taper shape that is inclined with respect to the gh piece of the duct passage, and enhances the shearing property of mud.

As shown in FIG. 1, the gate plates 20 and 30 reciprocate within a range that penetrates the discharge duct 1 a and projects to the opposite side of the discharge duct 1 a. A gate plate accommodating portion that surrounds the gate portion on the formation side of the hole 20a is provided. As shown in the sectional view of FIG. 6, the gate plate accommodating portion includes upper and lower presser plates 21 and 31, and side plates 23 and 33 interposed between side plates between these plates. As a result, a plate-shaped space continuous with the communication passage of the discharge duct 1a is formed, and the gate plates 20 and 30 reciprocate while sliding in the plate-shaped space. Further, the gate plates 20 and 30 are fixed to the mouths of the gate plate accommodating portions into which the gate plates 20 and 30 are inserted so that the gate plates 20 and 30 are sandwiched between the presser upper plates 21 and 31 and the lower presser plates 22 and 32. The watertightness is maintained by the gland packings 24 and 34. Furthermore, in this embodiment, as shown in FIGS. 3 and 5, a receiving trough 8 is provided in preparation for muddy water leaking from the tip of the storage case due to the pressure caused by the reciprocating movement of the gate plates 20 and 30. The leaked muddy water is directly introduced to the screw conveyor 7.

Under the discharging device, when discharging high-moisture content mud, first, with the lower gate valve 3 closed, the upper cylinder gate valve 2 is opened by operating the hydraulic cylinder 4, and the above hopper 1 is opened. After the high-moisture content mud is allowed to flow to the position of the lower gate valve 3, close the upper gate valve 2. Next, by opening the lower gate valve 3, the high water content mud in the space partitioned by the gate valves 2 and 3 drops onto the screen conveyor 7. If the drop is confirmed, the lower gate valve 3 is closed to complete one cycle of mud discharge. By repeating the above operation, it is possible to always discharge a fixed amount from inside the hopper 1. In addition, the amount of soil discharged can be measured by counting the number of discharge cycles. The discharge capacity from the hopper 1 can be appropriately adjusted by changing the operation cycle time of the hydraulic cylinders 4 and 5.

The high-moisture content mud discharged from the discharge duct 1 a is dropped onto the screw conveyor 7 and then conveyed to the mud solidifying device 12 by the conveyor 7. In addition, the solidified material in the solidified material hopper 9 is cut out by the screw feeder 10 along with the supply of the high water content mud to the mud solidification device 12, and is mixed with the high water content mud through the solidifying material chute 11. .. Then, the high-moisture content mud and the solidifying material are mixed in the mud solidifying device 12 and dehydrated and solidified by a chemical reaction, and then loaded into the truck 14 and carried out. By the way, as the solidifying material, cement-based, lime-based solidifying material or the like can be used.

[0013]

[Effect of the device]

 As described above in detail, according to the present invention, it is possible to control the discharge of the high-moisture content mud stored in the hopper. In addition, the trapping of discharged mud can be eliminated, and high-water mud can be reliably closed at the gate, ensuring watertightness.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a cutout portion of the discharge device of the present invention.

FIG. 2 is a schematic view of a mud solidification system using the discharge device of the present invention.

FIG. 3 is an enlarged view of a main part of the discharging device of the present invention.

FIG. 4 is a view taken along the line AA of FIG.

5 is a view taken along the line BB of FIG.

FIG. 6 is a view taken along the line CC of FIG.

FIG. 7 is a side view of a conventional discharging device.

FIG. 8 is a vertical cross-sectional view of a conventional discharging device.

[Explanation of symbols]

1 ... Hopper, 2 ... Upper gate valve, 3 ... Lower gate valve, 4/5 ... Hydraulic cylinder, 7 ... Screw conveyor, 8 ... Mud receiving gutter, 9 ... Solidifying material hopper, 12 ... Mud solidifying device

Claims (1)

[Claims for utility model registration] [Claim 1] A discharge device having upper and lower two-stage gate plates near the discharge port of the hopper, and controlling the opening and closing of a communication path to the discharge port by reciprocating movement of the gate plates. In the gate plate, a through hole is formed on one side of the moving direction line, and a closed surface on which the through hole is not formed is formed on the other side, and the through hole is formed as the gate plate reciprocates. Alternatively, a gate plate accommodating portion that surrounds the through hole side gate plate portion when the through hole is located outside the communication passage while controlling the discharge of the high water content mud by locating the closed surface in the communication passage portion, respectively A device for discharging high-moisture content mud, characterized by being provided with.