JPS648160B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a gravel discharge device for a muddy shield machine.

Conventionally, as shown in Fig. 1, mud is supplied from a mud supply pipe 4 inserted into the partition wall 2 of the mud water type shield excavator body 1 by a mud supply pump 8 to supply mud into the pressure chamber 3 and pressurize it. The cutter 1a protruding from the front part is driven and the excavated earth, sand and gravel 12 are mixed with the supplied mud water and discharged to the outside of the machine via the mud discharge pipe 5.

However, the excavated earth, sand and gravel 12 contain large-diameter gravel and cannot smoothly pass through the sludge pipe 5 and the sludge pump 9, or mix with muddy water and become highly concentrated and viscous, causing the inside of the sludge pipe 5. There was a problem with precipitation.

In this case, the diameter of the mud removal pipe 5 is increased to remove dirt and gravel 12.
In order to make the passage of mud smooth, the capacities of the reflux pump 7, mud supply pump 8, and mud removal pump 9 are increased, and the flow velocity is set such that the earth, sand, and gravel 12 in the mud do not stagnate in the mud removal pipe 5. Giving is a necessary condition.

If a flow rate that provides the above-mentioned flow velocity is supplied into the pressure chamber 3 in front of the partition wall 2, the supply water and the sludge will become unbalanced, making it difficult to discharge the sludge. The water pressure inside the area will suddenly increase and temporarily lift the ground, so if the water pressure drops afterwards, more ground will be pulled in than planned, which will have a negative impact on the ground.

Further, in order to transport a large amount of earth, sand, and gravel 12, a sludge pump 9 with rotating blades is provided in the sludge line, but this is enlarged and the sludge pipe 5 is
In order to make the flow of earth, sand and gravel 12 smooth within the tunnel, it is necessary to increase the size considerably in consideration of the diameter of passing gravel, but this is not possible due to the limitation of the effective space of the excavation cross section. Even if it were possible to increase the size, the pump would be easily clogged or damaged by large-diameter gravel.

For the above-mentioned reasons, in the past, earth, sand and gravel 12 often stagnate in the mud removal pipe 5, making it difficult to discharge and making it impossible to improve excavation efficiency.

The present invention was made in order to solve each of the above-mentioned problems. The object of the present invention is to provide a gravel discharge device for a muddy shield machine, which allows gravel to pass through smoothly and greatly improves excavation efficiency.

Embodiments of the present invention will be described below based on the drawings.

First, as shown in FIG. 2, the mud water type shield machine that serves as the base has a mud supply pipe 4 connected to a mud supply pump 8 in one side of the pressure chamber 3 of the excavator main body 1, which has a cutter 1a on the front part. In the other side of the pressure chamber 3, a mud water debris separation device 10 is provided in the mud drainage line, and behind it, a mud drainage pipe 5 equipped with a mud drainage pump 9 is disposed.

In the mud water type shield machine shown in FIG. 2, a gravel crushing device 11 is connected on the passage so as to become a part of the mud drainage line at a position immediately before the mud water debris separation device 10 provided in the mud drainage pipe 5. A reflux pipe 6 equipped with a reflux pump 7 which branches off from the mud water debris separation device 10 and returns to the sludge drainage pipe 5 in front of the gravel crushing device 11 is arranged in parallel to the sludge drainage pipe 5. ing.

In addition, the mud water debris separation device 10 that connects the first end of the reflux pipe 6 has a small-diameter hole formed in a cylinder between the pipes that become part of the internal mud removal line, as shown in FIGS. 4 to 6. A large number of strainers 13 are provided over the entire area of the surface.
A strainer 13B is fitted in a cylindrical surface having the same diameter as the strainer 13B in which a large number of longitudinal slots are provided in parallel.

Next, the action will be explained.

As shown in Fig. 2, pressurized mud water is supplied from the mud supply pipe 4 into the pressure chamber 3 of the excavator main body 1, and the earth, sand and gravel 12 excavated with the cutter 1a are mixed with the mud water in the pressure chamber 3. Thereafter, it is forced into the mud removal pipe 5.

At this time, the necessary flow of mud water is directly injected into the mud removal pipe 5 from the upper reflux pipe 6 by the feeding power of the reflux pump 7, so the earth and sand that have been forced into the mud removal pipe 5, Even if the gravel 12 is mixed with large-diameter gravel or has a high concentration or high viscosity, it is smoothly transported downstream.

Moreover, since the flow of the mud removal pipe 5 in the loop in which the return pipes 6 are arranged in parallel has improved, the pressure on the discharge side of the pressure chamber 3 in front of the mud removal pipe 5 decreases, and dirt and gravel are discharged from the pressure chamber 3. can be done extremely smoothly.

Further, since a gravel crushing device 11 is disposed downstream of the gravel crushing device 11, large-diameter gravel is crushed inside the gravel crushing device 11, and the gravel is sent into the mud water debris separation device 10 in a reduced diameter state.

The soil and gravel 12 that had become highly concentrated and highly viscous in this device 10 are separated from the muddy water and softened, and the diverted muddy water is pumped back into the mud removal pipe 5 via the reflux pipe 6 by the reflux pump 7. be done.

However, the dirt and gravel 12, mainly consisting of gravel, in the strainer 13A or 13B are transported downstream by the feeding power of the mud removal pump 9 disposed behind the strainer. In this case, there is no large-diameter gravel in the earth and gravel 12, so a large load is not applied to the mud removal pump 9,
After being transported smoothly without clogging or damaging the blades, it is ejected from the aircraft.

Note that the muddy water that has flowed down to the final position mixed with the earth, sand and gravel 12 is collected in a terminal tank (not shown).
It is separated from the gravel 12, and due to the pumping force at that location,
The slurry is fed into the original slurry supply pipe 4 again.

FIG. 3 shows another embodiment of the invention.

First, to explain the configuration, in a muddy water type shield machine similar to the above embodiment, two muddy water debris separation devices 10 of the same shape are arranged at intervals in the middle part of the mud removal pipe 5, and from each separation device, Two sets of reflux pipes 6 of the same shape with the same reflux pump 7 as shown in the embodiment shown in the previous embodiment are branched and returned to the forward sludge removal pipe 5.
One set includes the sludge drainage pipes 5 behind the partition wall 2 as in the previous embodiment.
The other set is connected in the same manner as described above at a position parallel to the mud drainage pipe 5 which is behind the upstream mud water debris separation device 10.

Next, the action will be explained.

Earth, sand and gravel 12 excavated in the same manner as in the previous example
When the mud is mixed with muddy water in the pressure chamber 3 and is forced into the mud removal pipe 5, the required flow rate of mud is directly injected into the mud removal pipe 5 from the upper recirculation pipe 6. As in the case of the previous embodiment, it is smoothly transported downstream.

Furthermore, when the earth, sand, and gravel 12 that have passed through the first mud/water debris separation device 10 reach the mud removal pipe 5 immediately after that, they are press-fitted into the mud removal pipe 5 from the reflux pipe 6 at the top of that position. Since the flow velocity is again given in the downstream direction by the required flow rate of the muddy water, the muddy water is smoothly conveyed rapidly, similarly passes through the inside of the muddy water debris separation device 10, and is discharged to the outside of the machine.

In this embodiment, the mud and gravel 12 are separated from the muddy water twice by the muddy water and debris separator 10, so the initial high concentration and high viscosity state is completely eliminated, and the water is removed from the reflux pipe 6 at two locations. As a result of the given flow velocity, the sludge is smoothly and rapidly transported to the final position of the sludge removal line without receiving the force of a sludge pump or the like behind it.

As explained above, the gist of the present invention is to provide a mud supply device that uses a mud supply pump 8 to forcefully feed mud water for drilling to the pressure chamber 3 of a shield machine via a mud supply pipe 4, and a mud supply system that pumps mud into the pressure chamber 3 of a shield machine through a mud supply pipe 4, A gravel separation device 10 is provided, and a mud removal device discharges excavated soil and gravel in the pressure chamber 3 together with mud water, and one end is branched from the mud water debris separation device 10 and the other end is connected to the pressure chamber 3. A reflux pipe 6 is provided in parallel with a part of the sludge pipe 5 that communicates with the sludge pipe 5 near the discharge port of the sludge pipe 5.
A reflux pump 7 is provided in the middle of the sludge drain pipe 5 to form a circulation path in cooperation with a part of the sludge drain pipe 5 so as to support the discharge capacity of the sludge pipe 5 and the discharge capacity from the pressure chamber 3, respectively. This is a gravel discharge device for a muddy water shield machine, which is comprised of a reflux device and a reflux device. Incidentally, a gravel crushing device 11 is provided in front of the separating device 10 in the circulation path as required.

The discharge device of the present invention having the above configuration has a pressure chamber 3.
Even if the soil and gravel 12 mixed with muddy water in the chamber become highly concentrated and highly viscous, or even if large-diameter gravel is mixed in, the muddy water and gravel will remain in the mud drain pipe 5 near the outlet of the pressure chamber 3. Since a large volume of circulating mud is pressurized through the reflux pipe 6 branched from the separator 10, the flow rate in the mud removal pipe 5 is increased, and the sand and gravel in the pressure chamber 3 are sucked and discharged. The sludge can be smoothly transported through the sludge drainage line without sedimentation or stagnation in the sludge drainage pipe 5, which has the effect of greatly improving excavation efficiency.

[Brief explanation of drawings]

Fig. 1 is a schematic diagram showing a conventional gravel discharge device in a muddy water shield machine, Fig. 2 is a schematic diagram showing a gravel discharge device according to a first embodiment of the present invention, and Fig. 3 is a schematic diagram showing a gravel discharge device according to a first embodiment of the present invention. Schematic diagram showing the gravel discharge device, No. 4
The figure is a partial longitudinal front view showing the mud/water debris separation device in the same device with a porous strainer fitted inside, and Figure 5 shows the same device with a slotted strainer fitted inside. Partial longitudinal front view,
FIG. 6 is a perspective view of each strainer fitted within the mud/water debris separation device. Explanation of symbols, 1... Excavator body, 1a... Cutter, 2... Bulkhead, 3... Pressure chamber, 4... Sludge supply pipe, 5... Sludge removal pipe, 6, 6X... Return pipe, 7 ……
Reflux pump, 8...Sludge supply pump, 9...Sludge pump, 10...Mud water debris separation device, 11...Gravel crushing device, 12...Earth and sand, gravel, 13A, 13B...
strainer.

Claims (1)

[Claims] 1. Mud water for drilling is pumped into the pressure chamber 3 of the shield machine from one side through the mud supply pipe 4, and the earth, sand and gravel mixed with the mud water in the pressure chamber 3 are removed by a mud water debris separation device 10 in the middle of the pipe. In this gravel discharge device, the mud water debris separation device 10 has a reflux system for branching and taking out a part of the separated mud water. A pipe 6 is connected to the reflux pipe, and a reflux pump 7 is attached to the reflux pipe, and the tip side of the reflux pipe 6 is communicated with the sludge removal pipe 5 which is close to the outlet of the pressure chamber 3. A gravel discharge device in a muddy water shield machine that assists the discharge of earth, sand, and gravel from the pressure chamber 3 to the mud discharge pipe 5.