JPH066866B2 - Underground docking method for shield tunnel and shield machine - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an underground docking method for a shield tunnel and an improvement of a shield machine.

More specifically, it is suitable for constructing a long tunnel on soft ground such as an aquifer gravel layer. It is a shield tunnel underground docking method for constructing a tunnel with a shield excavator by two-point starting and a shield excavation used for this method. It is about machines.

[Prior art]

In general, shield machines are widely used as the most suitable machine when constructing a tunnel on soft ground such as an aquifer gravel layer.As the excavation progresses, a segment is lined in the rear to construct the tunnel. To do.

By the way, if the tunnel to be constructed is long, it is excavated from both ends of the tunnel and docked at almost the center of the tunnel in order to shorten the construction period. In this case, after docking, the seal at the docking position is completely sealed to prevent excavated soil, water, etc. from flowing into the shield machine, and then dismantle each shield machine and remove it from the outside of the tunnel. I need to take it out.

Conventionally, as a sealing method at such a docking position, "chemical solution injection method" and "freezing method" are known.

The former is a method of docking two shield machines and injecting a special chemical liquid into the surrounding ground to solidify it.
The latter is to inject a refrigerant into the ground to freeze and solidify the water in the ground. However, in the former case, there is a lack of reliability in terms of strength due to the non-uniformity of soil improvement after injection of the chemical solution, and in the latter case, it requires a long period of several months to one year for freezing. Without
When thawing, there is a problem that the surrounding soil loosens and the tunnel junction is deformed.

Therefore, the present inventors have developed and already proposed the following two methods.

A first aspect of the invention is to form a compartment surrounded by a hood in front of a cutter wheel of a shield machine, and to fill and solidify a filling material in the compartment, and to excavate the filling material by the other shield machine. This is a method of fitting the tip of the other shield machine into the hood and then injecting and solidifying the chemical solution into the ground around the fitting part. (JP-A-1-102198) In the second invention, a cutter capable of projecting and retracting is provided on an outer peripheral portion of a cutter wheel of a shield machine, and a first ring groove is formed by the blade of one shield machine and the other is formed. After forming the second ring groove with the shield machine, the first ring groove and the second ring groove are filled and solidified with a filling material such as mortar to form a ring wall, and the ring wall is contacted with the inner surface. A shield tunnel underground docking method and a shield excavator in which a water-stop connecting plate attached to each cutter wheel is arranged. (Japanese Patent Application No. 1-105892) [Problems to be Solved by the Invention] However, in the method of forming the compartment surrounded by the hood in the connection portion of the shield tunnel and filling and solidifying the filling as described above, A large amount of the filler itself is required, and not only it takes a long time to solidify, but also it may not be possible to obtain sufficient mechanical strength and reliability due to the use of chemical injection.

In addition, in the method of forming the ring wall, a plurality of holes are excavated in the front ground of the cutter wheels so that the holes are in contact with each other by using a blade provided on the cutter wheels of the two shield excavators, and the ring groove is formed. Therefore, not only does it take time to form the ring groove, but there is a risk that earth and sand may flow into the ring groove. In this case, a good ring wall cannot be formed. Further, there is a problem that one shield machine is complicated and expensive.

[Means for Solving the Problems]

The present invention has been made in order to solve the above-mentioned conventional problems, in which one shield machine is started from each of two points,
In a shield tunnel machine that is docked at a fixed point, a ring groove is formed in front of this cutter wheel with a blade placed on the outer periphery of the cutter wheel of one shield machine, and an outer peripheral hood is formed on the outer periphery of this ring groove. And the other shield machine is moved forward so that the water stop plate provided on the cutter wheel is projected and brought into contact with the inner surface of the outer peripheral hood, and then the ring groove is filled and solidified with the filling material. It is intended to provide a shield tunnel underground docking method comprising a process of forming a wall and attaching a connecting plate to the ring wall so as to be attached to the two cutter wheels, and a shield machine used for this method. .

[Action]

According to the present invention, one shield excavator is started from each of two points, and when each shield excavator reaches a fixed point, it is stopped at a predetermined interval.

Then, first, a blade provided so as to be retractable forward is projected on the outer periphery of the cutter wheel of the one shield machine, the blade is rotated, and the cutter wheel is rotated to form a ring groove.

The blade is provided with an expanding beam having a cutter, and a relatively wide ring groove is formed for rotating the cutter wheel while rotating the expanding beam.

When this ring groove is formed, the blade is stored in the cutter wheel. Then, the outer peripheral hood provided on the shield machine is projected forward to prevent the gravel of the outer peripheral ground from flowing into the ring groove.

Then, when the other shield excavator is moved forward and its cutter wheel reaches the inside of the outer peripheral hood, the water stop plate is caused to protrude so as to contact the inner surface of the outer peripheral hood.

Further, a filler such as mortar is injected and solidified in the ring groove to form a ring wall.

After that, the two cutter wheels are connected by a connecting plate, in which case the connecting plate is arranged so as to contact the inner peripheral surface of the ring wall.

〔Example〕

An embodiment of a shield tunnel underground docking method and a shield machine according to the present invention will be described below with reference to FIGS. 1 to 8.

FIG. 1 is a side view of a first shield machine 1 used for carrying out a shield tunnel underground docking method according to the present invention. The first shield machine 1 has a cylindrical outer shell 2. A large number of cutter bits 3 are erected in front of, and a cutter wheel 5 having a blade 4 capable of projecting and retracting forward on the outer periphery thereof is rotated by a cutter motor 6, and then the natural ground is excavated to excavate the excavated earth and sand. It is adapted to move forward while being taken out from the outlet 7.

More specifically, the blade 4 is composed of a fixed portion 8 and a rotating portion 9 as shown in FIGS. 3 and 4, and a cutter 10 and an expanded beam 11 having a cutter (not shown) at the tip of the rotating portion 9. Is provided, and the blade 4 can be retracted in front of the cutter wheel 5 by a hydraulic jack 12.

This blade 4 has a radius l in front of the cutter wheel 5.
(FIG. 2) are arranged on the same circumference.
An injection pipe 13 for filling a filler such as mortar is arranged in the movement path of the blade 4. A hood 14 is provided in front of the outer shell 2, and a hydraulic jack is provided on the outer periphery of the hood 14.
An outer peripheral hood 16 is arranged by means of 15 so that it can project and retract forward. In addition, 17 is a waterproof seal, and 18 is an overcutter.

On the other hand, in the second shield machine 19, as shown in FIGS. 5 to 6, the circular edge of the cutter wheel 21 arranged in front of the outer shell 20 is formed into a two-step face plate shape 22 and A plurality of arc-shaped water stop plates 24 are provided which can be projected and retracted in the radial direction by a piston 23. Further, both end portions 24 'of each water stop plate 24 are configured to overlap the end portions 24' of the other water stop plates 24 arranged adjacent to each other.

And the small diameter part 2 of the two-step plate shape 22 of the cutter wheel 21
2'is the outer peripheral hood 16 of the first shield machine 1 described above.
It is configured so that they can be fitted inside with a suitable space. Reference numeral 25 is a filler injection pipe, and 26 is an overcutter.

Next, the underground tunnel decking method will be described.

Each of the first shield machine 1 and the second shield machine 19 having the above-described configuration is started from two points.

Then, when the predetermined docking point is reached, first the rotation of the cutter wheel 5 of the first shield machine 1 is stopped and the hydraulic pump 12 is actuated to rotate the blade 4 by a drive device (not shown) and move forward of the cutter wheel 5. It is projected (Fig. 8- (a)).

Then, when the expanded beam 11 of the blade 4 reaches a rotatable position, the cutter wheel 5 is rotated while rotating the blade 4 to form a ring groove 26 in the ground existing in front of the cutter wheel 5 (first Fig. 8-
(b)).

After the ring groove 26 is formed in this manner, the blade 4 is housed in the cutter wheel 5 (Fig. 3), and the hydraulic pump 15 is actuated to project the outer peripheral hood 16 forward, so that the outer periphery of the ring groove 26 is This outer peripheral hood 16 is arranged in (Fig. 8-
(c)).

After that, the second shield machine 19 is moved forward, and a part of the cutter wheel 21, more specifically, a two-step face plate shape 22
The small diameter portion 22 'of the outer peripheral hood 16 of the first shield machine 1 is
When it reaches the inside, the hydraulic piston 23 is actuated to project the water stop plate 24 until it abuts the inner surface of the outer circumferential hood 16, and partitions 28 and 29 are formed inside and outside the water stop plate 24, respectively.
A filling material such as mortar is injected and solidified in the filling material by using the filling material filling tubes 13 and 25.

When the filling solidifies, the ring wall 30 is formed. After that, the two cutter wheels 5 and 21 are joined by the connecting plate 31 so as to contact the ring wall 30 (see FIG. 8- ( d)).

After the two cutter wheels 5, 21 are joined by the ring wall 30 and the connecting plate 31 in this way, the first shield machine 1 and the second shield machine 19 are disassembled.

〔The invention's effect〕

As is clear from the above description, according to the shield tunnel underground docking method and the shield machine according to the present invention, the ring groove is formed by the first shield machine and the outer peripheral hood is projected in the ring groove. Prevents gravel, etc. from flowing into this ring groove,
The water shield of the second shield machine is brought into contact with the inner surface of the outer peripheral hood 16 to stop water, and then the filling is filled and solidified in the ring groove to form the ring wall. This not only simplifies the structure of the excavator, but also has the effect of significantly reducing the construction period.

[Brief description of drawings]

FIG. 1 shows an embodiment of a shield tunnel underground docking method and a shield machine according to the present invention.
Figure is a side view of the first shield machine, Figure 2 is a front view,
FIG. 3 is an enlarged view of part A of FIG. 1, FIG. 4 is an enlarged side view of a blade, and FIG. 5 is an enlarged side view of essential parts of a second shield machine.
FIG. 6 is a front view, FIG. 7 is an enlarged perspective view of an essential part, and FIG. 8 (a).
(D) is an explanatory view of a docking method. 1 ... 1st shield excavator 19 ... 2nd shield excavator 2,26 ... Outer shell 3 ... Cutter bit 4 ... Blade 5,5 ... Cutter wheel 8 ... Fixed part 9 ... Rotating part 10 ... Cutter 11 ... Enlarged part 13, 25 ... Filling material injection pipe 14 ... Hood 16 ... Peripheral hood 18, 24 ... Over cutter 22 ... Two-step face plate 24 ... Water stop plate 27 ... Ring groove 28, 29 ... Section 30 ... Ring wall 31 ... Connection plate

Claims (2)

[Claims] 1. A shield tunnel excavator in which one shield excavator is started from each of two points and is docked at a fixed point. (A) The shield tunnel excavator is arranged on the outer periphery of one of the shield excavators. With a blade, a step of forming a ring groove in front of the cutter wheel, (b) a step of disposing an outer peripheral hood on the outer peripheral portion of the ring groove, and (c) after advancing the other shield machine, stop. A step of bringing a water plate into contact with the inner surface of the outer peripheral hood; (d) a step of filling a filling material in the ring groove and solidifying the filling material to form a ring wall; Underground docking method for shield tunnel, which consists of attaching to two cutter wheels facing the inner surface of the wall and facing each other. 2. A cutter wheel and a filler injection pipe that can be retracted in front of the cutter wheel are arranged on the outer peripheral portion of the cutter wheel, and the front end of the main body has a diameter larger than that of the cutter wheel and slides in the front-rear direction. A first shield machine having a movable outer hood, and a cutter wheel provided with a water stop plate capable of projecting and retracting in a circumferential direction, and when the water stop plate protrudes, the outer hood of the first shield machine A shield machine having a second shield machine configured to abut the inner surface of the shield machine.