JP3572565B2 - Face water pressure measuring device for muddy shield - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a face water pressure measuring device having a function of removing soil and soil clogged in a face pressure gauge mounting pipe in a muddy water shield.
[0002]
[Prior art]
In a muddy water shield, it is necessary to excavate while controlling the water pressure of the face, and a face water pressure gauge is provided inside the partition wall to control the water pressure of the face. The water pressure gauge is connected to a pipe provided in a through hole provided in a partition wall and attached to the pipe. However, if the pipe is clogged with earth and sand, measurement accuracy is reduced.
[0003]
Therefore, conventionally, when the pipe was clogged, the water pressure gauge was removed and the inside of the pipe was washed with a water jet.
[0004]
[Problems to be solved by the invention]
However, when the frequency of the blockage increases, there is a problem that the machine stoppage time increases due to removal of the water pressure gauge, removal of earth and sand, cleaning of spilled mud, and the like, and the excavation speed decreases.
[0005]
In consideration of the above circumstances, the present invention can remove a blockage of piping by a simple operation without removing a water pressure gauge and without spilling of muddy water, thereby preventing a decrease in digging speed. An object of the present invention is to provide a face water pressure measuring device for a shield.
[0006]
[Means for Solving the Problems]
The invention according to claim 1 is a muddy shield in which pressurized muddy water is circulated between the face and the partition wall, and the face pressure is measured by a water pressure gauge arranged inside the partition wall. A T-shaped pipe consisting of a pipe and a branch pipe is arranged, the tip of the straight pipe is connected to the through hole of the partition wall communicating with the face side, a face water pressure gauge is connected to the tip of the branch pipe, and The base end is provided with an extruding rod which is inserted into the straight pipe via a waterproof packing, and which pushes out the earth and sand in the straight pipe toward the hole by being inserted.
[0007]
According to a second aspect of the present invention, in the first aspect, one end of a ball valve that allows the push rod to pass when opened is connected to the base end of the straight pipe, and the other end of the ball valve is connected to the other end of the ball valve. It is characterized in that a water packing is arranged and an extruding rod is kept on standby.
[0008]
A third aspect of the present invention is characterized in that, in the second aspect, an insertion guide for guiding the insertion operation when the push rod is inserted into the straight pipe is disposed on the other end side of the ball valve.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a side sectional view showing a schematic configuration of a muddy water shield provided with the face water pressure measuring device of the embodiment. In the figure, 1 is a cutter head, 2 is a partition, and 3 is a shield body. In the shield main body 3, a mud feed pipe 4 and a mud discharge pipe 5 for circulating pressurized muddy water between the face and the partition wall 2 are provided. A face water pressure measuring device 6 for measuring the face water pressure is provided inside the partition wall 2. FIG. 2 shows the details of the face water pressure measuring device 6.
[0010]
The face water pressure measuring device 6 includes a T-shaped pipe 7, a water pressure gauge 8, and a soil removal device 10. The T-shaped pipe 7 includes a straight pipe 7a and a branch pipe 7b. The tip of the straight pipe 7a is connected to the through hole 2a of the partition wall 2 communicating with the face, and the ball valve 9 is connected to the tip of the branch pipe 7b. The water pressure gauge 8 is connected via the. Further, the soil and sand removing device 10 is for extruding earth and sand clogged in the straight pipe 7a from the through hole 2a of the partition 2 and is connected to the base end of the straight pipe 7a.
[0011]
The earth and sand removing device 10 is for guiding an extruding rod 17 that can be inserted into the straight pipe 7a, a watertight packing 15 for securing a seal when the extruding rod 17 is inserted, and an insertion operation of the extruding rod 17. And the like. One end of a ball valve 12 is connected to the base end of the straight pipe 7a via a flange 11, and the mounting flange 13 of the earth and sand removing device 10 is connected to the other end of the ball valve 12. The distal end of the push rod 17 is inserted into the center hole of the mounting flange 13 through the waterproof packing 15, and the rear end of the push rod 17 is supported by the insertion guide 16. The ball valve 12 can allow the push rod 17 to pass when it is in the open state.
[0012]
The insertion guide 16 is composed of two horizontal rods 16a fixed integrally with the mounting flange 13, and a push rod 17 is disposed between the two rods 16a. An end plate 18 is fixed to the rear end of the push rod 17, and the push rod 17 is horizontally slidably supported by fitting two through holes provided in the end plate 18 into the respective rods 16 a. . The rod 16a is formed of a threaded rod, and a lock nut 20 for preventing the end plate 18 from coming off is fixed to the rear end of the rod 16a. On the front side of the lock nut 20, a nut member 19 that is screwed to the rod 16a and that moves in the longitudinal direction of the rod 16a by being rotated is arranged. These nut members 19 are used instead when the pushing rod 17 cannot be pushed into the inside of the straight pipe 7a even if the end plate 18 is pushed by hand, and the end plate 18 can be advanced by turning it with a tool. It has become.
[0013]
Next, the operation will be described.
When the water pressure of the face is measured by the water pressure gauge 8, the ball valve 9 on the water pressure gauge 8 side is opened and the ball valve 12 on the soil removal device 10 side is closed. As a result, the water pressure of the face does not leak to the push rod 17 side and reaches the water pressure gauge 8 via the T-shaped pipe 7 reliably, so that the water pressure of the face can be accurately measured by the water pressure gauge 8.
[0014]
On the other hand, when earth and sand are clogged in the T-shaped pipe 7, the ball valve 9 on the water pressure gauge 8 side is closed and the ball valve 12 on the earth and sand removal device 10 side is opened. Then, the pushing rod 17 pulled backward and put on standby is inserted into the straight pipe 7 a by pushing the end plate 18, and the earth and sand clogged inside is pushed out by the pushing rod 17. At this time, the tip of the push rod 17 slightly protrudes from the through hole 2 a of the partition wall 2. After the cleaning of the inside of the straight pipe 7a is completed, the push rod 17 is again pulled to the standby position, the ball valve 12 is closed, and the ball valve 9 on the water pressure gauge 8 side is opened. Thereby, normal measurement of the face water pressure can be restarted. In addition, since the insertion guide 16 reliably guides the movement of the push rod 17 at the time of the above operation, the push rod 17 can be inserted smoothly and reliably.
[0015]
【The invention's effect】
As described above, according to the first aspect of the invention, when the pipe is blocked, the earth and sand in the straight pipe can be pushed out only by inserting the push rod into the straight pipe. No need. In addition, since the push rod is inserted through the waterproof packing, there is no spillage of muddy water. Therefore, it is possible to remove the blockage of the piping with a simple operation without taking time, and as a result, it is possible to increase the excavation speed.
[0016]
According to the second aspect of the present invention, the other end of the straight pipe can be reliably closed by closing the ball valve, so that the burden on the watertight packing during ordinary excavation can be eliminated.
[0017]
According to the third aspect of the invention, since the insertion guide is provided, the insertion operation of the push rod can be performed smoothly.
[Brief description of the drawings]
FIG. 1 is a side sectional view of a muddy water shield provided with an earth and sand removing device according to an embodiment of the present invention.
FIG. 2 is a detailed view of the soil removal apparatus.
[Explanation of symbols]
2 Partition wall 2a Through hole 7 T-shaped pipe 10 Sediment removal device 12 Ball valve 17 Push rod 15 Waterproof packing 16 Insertion guide

Claims (3)

While circulating the pressurized muddy water between the face and the bulkhead, the muddy water shield that measures the face water pressure with a water pressure gauge arranged inside the bulkhead,
A T-shaped pipe consisting of a straight pipe and a branch pipe is disposed inside the partition wall,
Connect the tip of the straight pipe to the through hole of the partition wall communicating with the face side,
Connect a face pressure gauge to the tip of the branch pipe,
Further, at the base end of the straight pipe, there is provided an extrusion rod which is inserted into the straight pipe via a water-stop packing and is pushed out to push out the earth and sand in the straight pipe toward the through hole. Face water pressure measuring device for muddy water shield. The proximal end of the straight pipe was connected to one end of a ball valve that allowed the passage of the push rod in the open state, and the other end of the ball valve was provided with the waterproof packing and the push rod was kept on standby. The face water pressure measuring device for a muddy shield according to claim 1, wherein: The face water pressure measuring device for a muddy water shield according to claim 2, wherein an insertion guide for guiding the insertion operation when the push rod is inserted into the straight pipe is disposed on the other end side of the ball valve.

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