JPS6351596A - Method of muddy water shielding construction - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a muddy water shield construction method, and in particular, utilizes fresh water pressure to penetrate into a cutter chamber formed on the back side of a cutter face plate and remove piles in the forward direction of excavation. The present invention relates to a muddy water shield construction method that can remove obstacles such as.

[Prior Art] When excavating earth and sand to form a subway tunnel, etc., the position of obstacles such as piles in front of the excavation direction can be predicted in advance, and if the ground environment allows, It is removed by pulling it from the ground or, if this is not possible, from inside the shield.

Conventionally, in the muddy water shield construction method in which excavated earth and sand are mixed with muddy water and transported out of the system, a configuration as shown in Figure 4 has been adopted in order to remove obstacles such as piles from inside the shield.

As shown in the figure, a shield promoting grain a is provided facing the face, and this shield binary fia has a cutter face plate C for excavating the face at its front part.

On the back side of the cutter face plate C, there is formed a chamber d partitioned by a bulkhead e into which muddy water is introduced, warmed with excavated earth and sand, and then discharged. In such an excavator a, when an obstacle such as a resistor f appears in front of the excavator in the excavation direction, the position of the pile is detected and the cutter face plate C is stopped in front of the pile f. After this, Kiribasu and Kakchi 1! Pressurized air that resists the water pressure of the face was introduced into the chamber d, and the canter chamber d was entered from the manlock g formed in the bulkhead e to remove the anti-tank in the forward direction of excavation.

[Problems to be solved by the invention] By the way, in the conventional construction method that employs partial pressure air to remove obstacles from inside the shield, it is difficult to prevent pressure air from leaking from the ground and stabilize the face. In order to do this, it is necessary to inject a sufficient amount of chemical liquid into the ground, which inevitably increases costs and delays shielding work.

Therefore, the present invention was devised to effectively solve these problems, and provides a muddy water shield construction method that can easily remove obstacles such as piles in front of the excavation direction and save shield work time and cost. The purpose is to

[Means for Solving the Problems] The present invention introduces muddy water into the back side of the face plate of a cutter that faces the excavation direction and excavates the ground to counter the face water pressure, and also transports the excavated soil out of the system by the muddy water. In the muddy water shield construction method, which has a cutter chamber for cutting, after detecting that an obstacle such as a pile has appeared in the ground in front of the cutter face plate in the excavation direction, the cutter slit is opened facing the ground on the cutter face plate. After closing the cutter chamber and replacing the muddy water in the cutter chamber with fresh water that resists the face water pressure, the operator enters the cutter chamber and opens the cutter slit to remove the obstruction.

[Operation] First, the position of an obstacle such as a pile is predicted, the cutter slit is opened, and the front face of the cutter face plate is completely closed.

After the cutter face plate is fully opened, the muddy water in the cutter chamber is replaced with fresh water, and obstacles ahead in the excavation direction are removed within this fresh water.

[Example] An embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

As shown in FIG. 1, a cutter face plate 1 is provided for excavating the ground A at a direction of /v in the excavation direction.

A cutter chamber 3 partitioned off by a bulkhead 2 is formed on the back side of the cutter face plate 1. A mud feed pipe 4 and a mud drainage pipe 5 are connected to the cutter chamber 3, and the mud water introduced into the cutter chamber 3 counteracts the water pressure acting on the cutter face plate 1 by its water pressure and mixes with the milled earth and sand. The sludge is then transferred to the outside of the thread through the sludge draining pipe 5. Further, the bulkhead 2 that partitions the cutter chamber 3 is provided with a submersible lock 6 for entering and exiting the cutter chamber 3.

Further, a plurality of cutter slits 7 are formed in the cutter face plate 1.

These cutter slits 7 are opened in front of the cutter face plate 1 facing the ground A in order to introduce the excavated earth and sand into the cutter chamber 3, as shown in FIG.
It is configured to be opened and closed by an i8 opening device 8.

In addition, an injection valve 9 for injecting the filler is connected to the cutter face plate 1.
established in

As shown in FIG. 3, this injection valve 9 is configured to supply filler material to the cutter face plate 1 by reciprocating the spool 9b inside the valve box 9a by hydraulic pressure.

For example, water glass with plastic fluidity, polymer injection materials such as urethane, putty mixed with fibers, poorly mixed mortar, etc. are used as fillers.

Note that 10 is a ground exploration and injection device that detects the condition of the ground around the face and the shield.

In such a configuration, pile B is placed on the other mountain △ in front of the excavation direction.
If there is an obstacle such as the above, in order to remove it, first, the appearance of the resistance B is detected by the rock exploration injection device 10 or the like, and the cutter face plate 1 is stopped in front of the resistance.

After this, until now II! The cutter slit 7 opened to introduce the soil and sand is opened by a slit opening/closing device 8, and the entire area of the cutter face plate 1 is closed. Therefore, the cutter chamber 3 with a density of 1ff+ is formed on the back side of the cutter face plate.

Next, filler is injected into the cutter face plate 3 through the injection valve 9,
A filling wall C is formed on the front surface of the cutter face plate 1. That is,
A filling wall C filled between the front surface of the cutter face plate 1 and the face
This will stabilize the face.

In this way, the filler is injected into the cutter face plate 1, and the filler wall C
After this is formed, the muddy water in the sealed cutter chamber 3 is replaced with fresh water supplied from the water supply system via the mud supply pipe 4. At this time, the fresh water pressure is set so as to oppose the face water pressure. That is, as will be described later, the inside of the cutter chamber 3 is replaced with fresh water in order to secure visibility in order to enter the cutter chamber 3 and remove the pile B.

After the inside of the cutter chamber 3 has been replaced with fresh water, open the submersible lock 6 provided on the bulkhead 2, enter the cutter chamber 3 from this, and enter the pile B located forward in the direction of B.
The cutter slit 7 closest to the cutter slit 7 is opened. By opening this cutter slit 7, the resistor B, which is an obstacle, is melted and removed in water.

After removing obstacles like a mouth and leaving the cutter chamber 3, the cutter face plate 1 is moved through all the cutter slits 7 in order to dig and introduce the excavated earth and sand into the cutter chamber 3.
will be opened.

In this way, the present invention replaces the muddy water in the cutter chamber 3 with fresh water that counteracts the face water pressure, and removes obstacles in the fresh water, making it more stable than conventional construction methods such as partial pressure air.
In addition, it is possible to shorten shielding work time and reduce costs.

Furthermore, even if it encounters an unexpected obstacle that is difficult to predict, it can respond to the obstacle without being affected by the ground environment, making it highly reliable.

[Effects of the Invention] In summary, the present invention exhibits the following excellent effects.

(1) Mud water in the cutter chamber is replaced with clean water and obstacles are removed in the clean water, so there is less chemical injection and auxiliary construction methods using partially pressurized air are no longer required, shortening shield work time and reducing costs. can.

(2) It is not affected by the ground environment even if it encounters unexpected obstacles that are difficult to predict (it can deal with obstacles and is highly reliable).

[Brief explanation of the drawing]

Fig. 1 is a schematic sectional view showing an embodiment of the present invention, Fig. 2 is a view taken along the line If-II in Fig. 1, Fig. 3 is a sectional view showing an injection valve, and Fig. 4 is a conventional shield. FIG. In the figure, 1 is a cutter face plate, 3 is a cutter chamber, 7 is a cutter slit, A is a ground, and B is a stake. Patent Applicant: Ishikawajima-Harima Heavy Industries Co., Ltd. Representative Patent Attorney: Nobuo Kinuya Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] In the muddy water shield construction method, a cutter chamber is provided on the back side of the cutter face plate facing forward in the excavation direction to excavate the ground, for introducing muddy water to counter the face water pressure and for transporting the excavated earth and sand to the outside of the system using the muddy water. After detecting that an obstacle such as a pile has appeared in the ground in front of the cutter face plate in the excavation direction, the cutter slit opened facing the ground in the cutter face plate is closed, and the inside of the cutter chamber is changed from muddy water to face water pressure. A muddy water shield construction method characterized in that after the water is replaced with clean water that resists the water, the obstacle is removed by entering the cutter chamber and opening the cutter slit.