JPS6033195Y2 - Solids distribution device for fluid conveyance of excavated soil - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a solid matter distribution device for fluid transportation of excavated earth and sand, which is applied to the mud water pressurized shield construction method.

゛In the above-mentioned shield method, when carrying out fluid transport of excavated soil, if the excavated stratum is mixed with gravel, solids such as gravel contained in the earth and sand may clog the conveying pipe or damage the slurry pump. In particular, problems such as blockages caused by large-diameter gravel must be prevented, as this will cause problems.

For this reason, slurry crushers, which crush large-diameter gravel in the conveyance line to reduce particle size and facilitate fluid conveyance, have come into widespread use.

In other words, in the mud transport flow diagram of the mud pressurized shield construction method shown in Fig. 1, in order to transport large-diameter gravel with a large weight before crushing from shield excavator a to crusher b, shield excavator a and crusher In addition to using a fluid transport pipe C having a pipe diameter that can transport large-diameter gravel between 6 and 6,
Considerable flow rates will be required.

However, in general, the mud feeding/discharging line d has a considerable distance, and therefore the flow velocity sufficient to convey large-diameter gravel cannot be obtained using the mud feeding/discharging line d alone.

Therefore, a circulation circuit is created which branches off from the mud removal line d' and returns to the shield excavator a, and a circulation pump P installed in this circuit d' connects the shield excavator a and the crusher 6.
By increasing the flow velocity between the two, it is possible to transport large-diameter gravel.

Further, the crushed gravel is returned to the treatment plant f by the mud removal pump P', and the mud from the treatment plant f is returned to the shield excavator a by the mud feeding pump P'', but the mud is sent to the circulation circuit d''. In order to divert only
A flow dividing device e is provided at a branch point between the mud removal line d' and the circulation circuit r.

However, since this kind of conventional flow dividing device is simply provided with a mesh plate or a slit plate, the meshes or slits are likely to become clogged, and the flow dividing function cannot be satisfied.

Therefore, as a result of studies in view of the above-mentioned conventional circumstances, the present invention was developed by spontaneously creating a new design for the branch part of the sludge sludge line and the circulation circuit inside the box-shaped valve casing, which is connected to the fluid conveyance pipe, sludge sludge line, and circulation circuit, respectively. By appropriately arranging and configuring the screens, the screen automatically vibrates due to the flow velocity of the slurry and the collision of solids contained in the slurry, thereby changing the screen interval through which the slurry should pass. This prevents the clogging caused by the aforementioned clogging, and furthermore, the mechanism is self-driven and does not require power, allowing for miniaturization and reduction of equipment costs.

The following is a detailed explanation of the drawings showing the embodiment of this plan.
As shown in FIG. 2, a box-shaped valve housing 1 forming the main body of the device has a fluid conveying pipe 2 for excavated soil containing solids and a mud removal line 3 at its front, rear and top parts, respectively. tube 3′,
The conveying pipes 4' forming the circulation circuit 4 are connected to each other, and a cantilever is provided at a branch part that separates the side where the fluid conveying pipe 2 and the mud removal line 3 communicate with each other and the circulation circuit 4 side. A self-oscillating screen 5 is provided to connect the fluid conveying pipe 2 to the valve housing 1.
Due to the collision between the flow velocity of the slurry 6 flowing into the slurry 6 and the solid matter 7 contained in the slurry 6, the screen 5 repels and vibrates, repelling the solid matter 7 downward and containing the solid matter 7. Slurry 6' is divided into slurry 6' and slurry 6# which does not contain solids 7. Slurry 6' containing solids is transported by driving pumps A and B installed in both transport pipes 3' and 4', respectively. Sludge is drained from the pipe 3', while a certain amount of slurry 6' not containing solids passes through the screen 5 and is drained from the conveying pipe 4' to the circulation circuit 4.

In this case, the cantilever self-oscillating screen 5 is shown in FIGS. 2 and 3.
As shown in the figure, one end of a plurality of spring steel rods 5' is fixed to a shelf 8 protruding from the inner wall of the box-shaped valve housing 1 with a support metal fitting 9 and spaced at regular intervals. They are arranged in a substantially comb shape, and the other end is formed as a free end, and each of the spring steel rods 5' vibrates due to its spring characteristics against fluid pressure. The solid matter 7 in the fluid collides with the spring steel rod 5', and the repulsion becomes more intense, repelling the solid matter 7 and classifying the solid matter 7 in the fluid into passing particles and non-passing particles. The passing particles flow into the conveying pipe 4', and the non-passing particles are repelled by the spring steel rods 5', so that they flow into the conveying pipe 3' without being retained. .

In addition to the function of repelling the solid matter 7 as described above, the cantilever self-oscillating screen 5 has the function of repelling the solid matter 7 as described above. By vibrating individually, the screen interval 11, that is, the distance between the spring steel rods 5', 5' changes, thereby preventing clogging.

Also, if you want to adjust the size of the above-mentioned non-passing particles, you can change the screen spacing 1 or replace it with a spring steel rod 5' of a different thickness. Can be adjusted.

The above-mentioned is a flow dividing device for use with the gravel mud processing type shield method, but the proposed device can also be used in various ways as a flow dividing device for fluid transportation of solid materials, and for example, it can be used to change the size of non-passing particles in stages. By arranging several devices in sequence on a fluid transport line, it can also be used as a classifier for classifying and sorting objects to be transported during the fluid transport process.

As explained above, according to the device of the present invention, a fluid conveying pipe for excavated soil containing solids is connected to the front lower part of the box-shaped valve housing, and a mud drainage line is connected to the rear lower part of the box-shaped valve housing. A conveying pipe forming a circulation circuit is connected to the upper part of the box-shaped valve housing, and a flow path extending between the fluid conveying pipe and the circulating circuit conveying pipe is connected inside the box-shaped valve housing. A cantilever self-oscillating screen is arranged to intersect with the sludge line, and the fixed end side thereof is fixed, and the free end side of the cantilever self-oscillating screen is inclined downward toward the conveying pipe side for the mud removal line. It is a feature.

Therefore, in the case of the present invention, when introducing excavated soil containing solids from a fluid conveyance pipe into a box-shaped valve casing and performing predetermined branching, the fluidity from the fluid conveyance pipe to the circulation circuit conveyance pipe and the fluidity between the fluid conveyance pipe and the Due to the fluidity of one side, the fine particles in the excavated soil pass through the cantilever self-oscillating screen and flow into the circulation circuit transport pipe, and solids, etc. is prevented from passing through the screen and flows into the conveyor pipe for the sludge removal line.In this case, existing technical means of sifting from the top to the bottom are eliminated, and a special means of sifting from the bottom to the top is used. This eliminates the screen destruction that occurs when solids fall from the top to the bottom (high collision energy), and the circulation circuit conveyance pipe only needs to suck in fine particles, so the suction power, or pump output, is reduced. is small enough, and since the cantilever self-oscillating screen is inclined toward the transport pipe for the mud removal line, solids, etc. are smoothly guided to the transport pipe for the mud removal line, thus achieving the desired purpose. Diversion can be carried out safely and rationally.

Furthermore, since the cantilever self-oscillating screen vibrates due to pressure water flow, collision with solid objects, etc., clogging is less likely to occur, and a driving device for preventing clogging is not required, which is economical.

[Brief explanation of the drawing]

Figure 1 is a mud flow diagram for the gravel mud pressurized shield method.
Fig. 2 is a vertical cross-sectional side view showing a solid matter separation device for fluid conveyance according to the present invention, and Fig. 3 is a - - - - in Fig. 2.
It is a sectional view taken along the line. 1...Box-shaped valve housing, 2...:Fluid conveyance pipe,
3...Sludge drainage line, 4...Circulation circuit,
5...Cantilever self-oscillating screen, 5'...
・Spring steel rod.

Claims (2)

[Scope of utility model registration request] (1) A fluid transport pipe for excavated soil containing solids is connected to the front lower part of the box-shaped valve housing, and a transport pipe forming a mud drainage line is connected to the rear lower part of the box-shaped valve housing. A conveyance pipe forming a circulation circuit is connected to the upper part of the box-shaped valve housing, and a cantilever self-oscillation is connected inside the box-shaped valve housing, intersecting the flow path spanning the fluid conveyance pipe and the circulation circuit conveyance pipe. A screen is arranged, the fixed end side of which is fixed, and the free end side of the cantilever self-oscillating screen is inclined downward toward the transport pipe side for a mud removal line. Diversion device. (2) The solid matter diversion device for fluid conveyance of excavated earth and sand as set forth in claim 1, wherein the cantilever self-oscillating screen is provided with a large number of spring steel rods arranged in a comb-like shape.