JPS6338317Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to an injection device that jets pressurized water or the like into earth and sand.

Next, as an example of the above-mentioned injection device, an earth and sand intake hopper equipped with an injection nozzle for ejecting pressurized water into the chamber of a mechanical shield excavator will be described with reference to FIGS. 1 to 3.

A plurality of partition plates 4 are attached radially to the cutter foil 1 rotatably supported on the shield body 3 by a ball race 2, and the chamber 18 inside the cutter foil is
The inside is divided. A hopper 5 projecting into the chamber 18 is attached to the partition wall 9 of the shield body 3, and an opening formed between the side walls 5a and 5b of the hopper 5 is connected to the chamber 18. The partition wall 9 includes a conveyor whose one end protrudes into the hopper 5;
For example, a screw conveyor 6 is attached. Injection nozzles 7 are attached to the side walls 5a, 5b of the hopper 5, and each injection nozzle is connected to a pressure water pipe 8 for feeding pressure water from a pump. The earth and sand excavated by the cutter wheel 1 enters the chamber 18, is carried upward by the partition plate 4 as the cutter wheel 1 rotates, falls into the hopper 5 through the opening of the hopper 5, and is transferred to the screw conveyor 6. It is then transported backwards.

When the injection nozzle 7 is installed in the earth and sand as described above, when the pressure water is not being injected, the injection hole 7a
(See Figure 3) Particles of earth and sand may enter the pipe and cause a blockage, making it impossible to spray pressurized water.

The object of this invention is to provide a pressurized water injection device that does not cause clogging of the injection port with dirt.

In order to achieve the above-mentioned purpose, this device for spraying pressurized water, etc. has a bottomed cylinder installed on the mounting wall with its open side facing into the earth and sand, and pressure is injected into the hole provided at the bottom of the cylinder. Connect water pipes, etc., and install two elastic plates with diametrical cuts in the opening end of the cylindrical body through a holding plate so that the center of each cut intersects with each other. A non-return plate is provided inside the cylindrical body to prevent the elastic plate from deforming from the opening side end face of the cylindrical body to the bottom side and to form a conduction path, and the elastic plate is made elastic by supplying pressure water etc. from piping. By deforming the plate toward the earth and sand side, a passage for pressurized water or the like is formed at the intersection of the cuts.

In the configuration of this device, when pressure water is supplied from the pressure water piping, the two elastic plates deform toward the earth and sand, forming a conduit at the intersection of the notches, and pressurized water is injected into the earth and sand. be done. When the supply of pressurized water is stopped, both elastic plates are restored and the notch is closed, preventing earth and sand from entering the cylindrical body side. An embodiment of this invention will be described below with reference to FIGS. 4 to 10.

A bottomed cylindrical body 11 is fixed to the side wall 5b of the hopper, which is a mounting wall portion, and a pressure water pipe 8 is connected to a hole at the bottom of the cylindrical body 11. Cylindrical body 1
1, an inner elastic plate 13 and an outer elastic plate 14 each having cuts 13a and 14a in the diametrical direction are provided with an annular holding plate 15 such that the cuts 13a and 14a intersect with each other. It is attached by a bolt 16 through the holder. Depth of cut 13
The depth of a, 14a is equal to the total thickness of the elastic plates 13, 14, and the length is equal to the inner diameter of the cylindrical body 11.

A plurality of non-return plates 17 are installed inside the cylindrical body 11, and one end thereof is flush with the opening side end surface of the cylindrical body. A water conduit has been formed. One of the non-return plates 17 is arranged at a diametrical position on the inner circumference of the cylindrical body.

Before explaining the function of this device, the inner elastic plate 13
The effect when only one sheet is attached to the cylindrical body 11 will be described.

When pressure water is not being fed through the pressure water piping 8, the notch 13a of the elastic plate 13 is closed. When the pressure p of pressurized water acts, the elastic plate 13 bends,
The notch 13a is opened as shown in FIG. 10, and pressurized water is ejected from the opening. On the other hand, the sediment pressure
Since deformation of the elastic plate 13 due to p' or the like is prevented by the non-return plate 17, the notch 13a remains closed.

In the injection device of this invention, when the pressure p of the pressure water acts, only the central intersection 19 of the cuts 13a and 14a opens due to the deformation of the elastic plates 13 and 14 toward the earth and sand, and the pressure water flows from the opening. gushes out.

When the supply of pressurized water is stopped, the cuts 13a and 14a in the elastic plates 13 and 14 are returned to their original positions and closed. At this time, since the inner elastic plate 13 is not in direct contact with the earth and sand, earth and sand will not be caught in the cut 13a and the cut will not remain open.
Since the deformation of both elastic plates 13 and 14 due to p' etc. is reliably prevented by the non-return plate 17, the cut 13
a, 14a will never open. And depth of cut 13
Since a and 14a intersect only at one point in the center, it is difficult for earth and sand to enter the inside of the cylindrical body 11.

As explained above, according to this invention, it is possible to prevent the pressurized water injection port from being clogged with earth and sand, and to avoid the inability to eject pressurized water. Therefore, if the injection device of this invention is installed in the earth and sand intake hopper, it is possible to prevent the formation of earth and sand arches or bridges on the hopper.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional side view showing a mechanical digging shield excavator with a pressure water injection nozzle attached to the side wall of the earth and sand intake hopper, Figure 2 is a cross-sectional view of Figure 1,
FIG. 3 is an enlarged sectional view showing the injection nozzle in FIG. 2;
FIG. 4 is a cross-sectional side view showing one embodiment of this invention, FIG. 5 is a view seen from the - line side of FIG. 4, FIG. 6 is a cross-sectional view of FIG. Fig. 8 is an explanatory diagram showing the open state of the elastic plate in Fig. 4, Fig. 9 is a sectional side view showing a pressure water injection device in which one elastic plate is attached to a cylindrical body, FIG. 10 is a view seen from the - line side of FIG. 9, showing a state in which the notches of the elastic plate are open. 1...Katsuta foil, 3...Shield body, 5
...Hopper, 5b...Side wall of hopper, 8...Pressure water piping, 11...Cylindrical body, 13...Inner elastic plate,
13a...notch, 14...outer elastic plate, 14a
... cut, 15 ... holding plate, 16 ... bolt,
17...Return plate.

Claims (1)

[Scope of utility model registration request] Install a cylindrical body with a bottom on the mounting wall with its opening side facing the earth and sand, connect a pipe for pressurized water, etc. to the hole provided at the bottom of the cylindrical body, and connect it to the end face of the cylindrical body on the opening side in the diametrical direction. Two elastic plates with cuts are attached via a press plate so that the center portions of the cuts intersect with each other, and the elastic plates are placed inside the cylinder from the open end face of the cylinder to the bottom side. A check plate is installed to prevent deformation and to form a conduction path, and when the elastic plate is deformed to the earth and sand side by supply of pressure water etc. from the piping, pressure water is applied to the intersection of the cuts. An injection device for pressurized water, etc., characterized in that a passage such as the like is formed.