JPH0378916B2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a muddy shield tunneling machine for small diameter pipes in a propulsion construction method.

<Conventional technology> Conventionally, muddy water type shield tunneling machines have been equipped with equipment such as a cutter head drive device, shield jacking device, bypass device, etc. inside the shield tunneling machine, and are piped from the starting shaft. Shield excavators and small excavators transport mud into the intake chamber through a mud feed pipe, excavate while counteracting the earth pressure and water pressure of the face ground, and transport the excavated earth and mud to the outside of the starting shaft through a mud drainage pipe. As a mud water type shield excavator for caliber pipes, the mud pipe that was piped into the tunnel from the starting shaft was used as the rotary drive shaft for the cutter head at the tip, and the drive device inside the shield excavator was installed inside the starting shaft. There are shield tunneling machines that are smaller in size and have easy maintenance and inspection of the drive unit.

However, in the case of the above-mentioned conventional technology, since equipment such as a drive device, a shield jacking device, a bypass device, etc. are installed inside the shield excavator, especially in the case of small diameter pipe propulsion of φ500 m/m or less, Incorporation into the shield tunneling machine becomes complicated,
Manufacturing becomes difficult.

In addition, in the shield excavator described below, by installing the drive device of the cutter head in the starting shaft, propulsion for small diameter pipes becomes possible, and maintenance and inspection of the drive unit etc. can be directly inspected.
The mud drainage pipe that drains excavated soil and mud water is piped from the starting shaft side through the propulsion pipe to the inside of the shield excavator using the same method as in conventional muddy shield excavators, but the pipe is a small diameter pipe with a diameter of 500 m/m or less. Because the space inside the propulsion tube is narrow, the tube must be smaller in diameter than the mud feeding tube that also serves as the drive shaft.
Therefore, when promoting soil quality that includes gravel in the face sand,
Problems often occur due to clogging of gravel in the mud removal pipes. Furthermore, the bypass function of a shield tunneling machine is a method in which a bulkhead is installed in the intake chamber, a bypass chamber is installed behind it, and the slit in the bulkhead is closed to circulate the flow inside the bypass chamber. If the excavated soil settles or accumulates in the front intake chamber if the length is long, or if the mud water pressure fluctuates due to muddy water leakage, etc., the face mud may collapse, so it is not always possible to use a completely shielded excavator. The current situation is that there is no such thing.

<Problems to be Solved by the Invention> As mentioned above, the conventional mud shield tunneling machine for small diameter pipes has problems such as the mud removal pipe in the propulsion pipe and the bypass mechanism in the shield tunneling machine. Current technology is not necessarily perfect. Therefore, the present invention has a structure in which the diameter of the sludge removal pipe in the propulsion pipe can be made as large as possible within an allowable range, and furthermore, the bypass mechanism in the shield excavator is such that the collapsed soil of the face ground flows through the slit of the cutter head into the intake chamber. A mechanism that closes the slit at the cutter head to prevent muddy water from flowing into the cutter head.

The above two mechanisms enable easier and more reliable mud water propulsion for small diameter pipes.

<Means and actions to solve the problem> Two pipes for sending and removing mud are effectively installed in a small circular space inside a small-diameter pipe, and a large pipe is installed in the pipe to prevent clogging with gravel, etc. To increase the diameter, a concentric double-tube structure is used that also serves as the rotational drive shaft for the cutter head. By using the outer pipe of the double pipe as a mud feeding pipe and the inner pipe as a mud removing pipe, it is possible to use a pipe with a larger diameter than before. In addition, when the propulsion is stopped, the bypass mechanism inside the shield excavator pushes the front cylinder forward using the slit opening/closing jack, and by bringing the bulkhead provided in the front cylinder into close contact with the tip cutter head, the slit in the cutter head is closed and the face ground is removed. Completely prevents collapse. Inside the shield excavator, muddy water circulates behind the cutter head, so there is no need to worry about sinking or accumulation of excavated soil.

<Example> An example of the present invention is shown in FIGS. 1, 2, 3,
It is shown in FIG. 4, FIG. 5, and FIG. 6, and will be specifically explained.

As shown in Fig. 1, a cutter head 2 having a slit 21 for taking in earth and gravel is attached to the tip of the shield excavator 1, and the rotating shaft for rotating the cutter head 2 is concentric with the rotating shaft so that mud can be sent and removed. It has a double-tube structure, and the outer tube 11 is used for feeding mud, and the inner tube 12 is used for mud removal and also serves as a rotational drive shaft. A intake chamber 5 consisting of a front cylinder 3 and a partition wall 4 is provided at the rear of the cutter head 2, and the partition wall 4 is provided with two circulation ports 16 (upper and lower) for circulating muddy water during propulsion. Behind the partition wall 4 is a front cylinder 3.
and a reflux chamber 7 formed by the water stop wall 10 of the rear cylinder 8.
The structure of the two rotation shafts of the cutter head in the circulation chamber 7 has one outlet 31 in the double-pipe external pipe 11 to send the muddy water sent toward the face.
In order to create a structure that can communicate the muddy water mixed with the face earth and sand to the mud removal pipe of the inner pipe 12 of the double pipe, a rotational force transmission beam 9 mechanism supported at four points in the circumferential direction is used. Direction correction jacks 18 for correcting the direction of the shield tunnel machine and slit opening/closing for closing the slit 21 of the cutter head 2 when propulsion is stopped are located at four symmetrical positions on the inside of the joint of the front cylinder 3 and the rear cylinder 8, both horizontally and vertically. Jack 1
9 has been installed. As shown in FIG. 5, the double tubes in the propulsion tube 14 are connected by connecting flange portions 17 projecting in three directions with bolts 15.
The outer tube 11 and inner tube 12 of the double tube are fixed by a plurality of stays 22 provided at appropriate positions.

Inside the starting shaft 30, as shown in FIG.
is provided, and the rotational force of the drive machine 24 is transmitted through the drive transmission pipe 2.
5 to the double pipe.

Now, when mud is sent from outside the starting shaft 30, it passes through the double-pipe external pipe 11, is sent from the outlet 31 in the circulation chamber 7, and is taken out through the circulation opening 16 provided in the partition wall 4. The inside of the chamber 5 is filled, and the face earth pressure
Mud water pressure is generated that opposes the water pressure.

When the shield excavator 1 is propelled while the cutter head 2 is rotated by the driving machine 24, the face earth and sand are moved through the slit 2 provided in the cutter head 2.
1 into the intake chamber 5, passes through the circulation port 16 along with the muddy water, is carried to the circulation chamber 7, is drained from the double-pipe internal pipe 12 through the mud discharge port 32 of the rotational force transmission beam 9, and is started. It is being carried outside of shaft 30. When one propulsion tube 14 has been propelled by the above method, the rotation of the cutter head 2 is stopped so that the slit 21 is positioned on the left and right as shown in FIGS. 2, 3, and 4. . This stop position can be easily confirmed by providing a mark on the drive transmission pipe 25 in the starting shaft 30. After the cutter head 2 has stopped, the slit opening/closing jack 19 is extended to advance the front cylinder 3, and the cutter head 2 is moved forward.
and the partition wall 4 are brought into close contact. At this time cutter head 2
Since the slit 21 and the circulation port 16 of the partition wall 4 are located at 90 degrees perpendicular to each other, the feeding of mud to the face side is stopped and the slurry is circulated within the circulation chamber 7.

<Effects of the Invention> The present invention provides the following effects on muddy water propulsion for small diameter pipes.

1 The sludge transport pipe has a double pipe structure that also serves as the rotation axis of the cutter head, so it is especially suitable for φ500m/m.
In the following small-diameter pipe propulsion, the diameter of the sludge removal pipe can be made larger than the conventional pipe diameter, and clogging of gravel inside the pipe has almost disappeared. In addition, by adopting an effective double-tube structure and a three-sided flange connection method, the visible range of the target for detecting the attitude of the shield tunneling machine can be widened.

1 When propulsion is stopped, the cutter head is brought into close contact with the bulkhead at the rear of the cutter head to close the slit in the cutter head, which completely prevents the collapse of the face rock and the inflow and subsidence of earth and gravel into the shield excavator. It is now possible to prevent this.

1. The mud feed/discharge pipe has a double pipe structure, and the flanges protruding on three sides are joined by bolts, making it possible to connect two mud pipes at the same time, reducing work time. It can be shortened. Furthermore, by adopting a concentric double tube structure, it has become possible to create a rotating shaft with a large cross-sectional force even against the rotational force of the cutter head.

As a result of the above-described effects of the invention, all the problems of the prior art have been solved, and reliable small-diameter pipe mud water propulsion with fewer troubles has become possible.

[Brief explanation of drawings]

FIG. 1 is an explanatory longitudinal cross-sectional view of a muddy shield excavator for small-diameter pipes showing one embodiment of the present invention. FIG. 2 is an explanatory longitudinal cross-sectional view of the shield tunneling machine showing the circulation situation when propulsion is stopped. FIG. 3 is a front explanatory view of the cutter head. FIG. 4 is a front explanatory view of the partition wall. FIG. 5 is an explanatory cross-sectional view showing a joint portion of a double pipe that also serves as a rotating shaft. FIG. 6 is an explanatory longitudinal cross-sectional view showing the drive device on the starting shaft side. In addition, 6 in the figure is the tip rotation axis of the cutter head.
13 is a bearing that supports the double tube rotating shaft. 20
is a target that detects the attitude of the shield tunneling machine.
26 is a propulsion device. 27 is a rotary joint for mud feeding. 28 is a rotary joint for mud removal. 29
indicates propulsion jerk.

Claims (1)

[Claims] 1 A cutter head 2 having a slit 21 for taking in earth and gravel is attached to the tip of the shield excavator 1, and a rotating shaft for rotating the cutter head 2 is designed to send and remove muddy water to counter the face earth pressure and water pressure within the rotating shaft. External tube 11 with concentric double tube structure
is for mud feeding, and the internal pipe 12 is for mud removal. Behind the cutter head 2 is provided an intake chamber 5 consisting of a front cylinder 3 and a partition wall 4, and the partition wall 4 is provided with a circulation port 16 for circulating mud water during propulsion. There are two locations, upper and lower, and behind the intake chamber 5 there is a circulation chamber 7 consisting of a water-stop wall 10 of the front cylinder 3 and rear cylinder 8. In order to send the muddy water sent from the shaft 30 side toward the face, one outlet 31 is provided in the outer pipe 11 of the double pipe, and the muddy water mixed with the face earth and sand is sent to the inner pipe 1 of the double pipe.
In order to create a structure that can connect to the sludge removal pipe No. 2, a rotational force transmission beam 9 mechanism is used that is supported at four points in the circumferential direction, and the front cylinder 3 and the rear cylinder 8 are arranged symmetrically on the left and right and vertically inside the joint part. A direction correction jack 18 that corrects the direction of the shield tunneling machine 1 and a slit opening/closing jack 1 that closes the slit 21 of the cutter head 2 when propulsion is stopped are located at four positions.
A mud water type shield excavator for small diameter pipes, which is characterized by the installation of 9.