JP2003278498A - Tunnel invert execution method using movable pier, and movable pier - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To greatly enhance movement efficiency, reduce a construction period, and allow invert construction to be applied to a lower part of a tunnel, which is close to a tunnel face. <P>SOLUTION: In the movable pier, a self-propelled mechanism 22 is arranged in a lower part of a pedestal 20 via a swing traverse means 24; an outrigger 44 is arranged in the front and rear of the pedestal 20; and a vehicle guiding platform 46 is arranged ahead of the pedestal 20. Characteristically, after invert excavation on the side of advance, the mechanisms 22 of the movable pier are installed on an already-invert-constructed surface 60 and an upper half excavated plate 50 immediately after the excavation by the ascent of the guiding platform 46, respectively; an invert concrete placing part is protected during curing of placed invert concrete; the passage of heavy equipment 52, a vehicle 54 and the like is allowed; and traverse properties of the pier are enhanced by virtue of the ascent and descent of the outrigger 44 and the traverse of the pedestal 20 and the mechanism 22 by the means 24. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention, in tunnel invert construction, allows heavy equipment, a vehicle for transporting earth and sand, etc. to pass through during invert concrete curing during casting, and also inverts to the lower part of the tunnel immediately after excavation close to the tunnel face. The present invention relates to a tunnel invert construction method using a mobile pier that enables construction and a mobile pier.

[0002]

2. Description of the Related Art Originally, a tunnel was constructed by excavating a rock mass with an excavator, driving a reinforcing material such as anchor bolts into the rock mass to reinforce the rock mass, and then temporarily carrying out primary and This was done by placing concrete for secondary lining and curing and curing the placed concrete.

Further, when the bedrock is soft, it is necessary to invert construction (placing invert concrete) on the lower part of the tunnel immediately after excavation close to the tunnel face. In this case, excavation work by the excavator on the side of the tunnel face is required. In addition to temporarily suspending the work of excavating the excavated earth and sand, in order to stabilize the bedrock, the bottom of the tunnel was dug down into an arch shape, and then invert concrete was placed and cured.

Further, the earth and sand excavated by the excavator is located at a predetermined distance from the tunnel face side, about 150 to 200 m away from the tunnel face side, from the tunnel face side to the tunnel pit side, one side in the width direction of the tunnel, for example, the center. Through a heavy machine such as a power shovel or a bulldozer that is deployed to the right side (or left side) from the same side in the width direction of the tunnel, for example, a dump truck that is deployed in tandem with the heavy machine from the center to the right side (or left side). Transfer to the other side of the tunnel and move it to the other side in the width direction of the tunnel.
Sediment on the other side of the width direction of the tunnel was carried out (Fig. 13
reference).

At this point, invert construction is performed on the lower part of the excavated tunnel on the side of the tunnel pit, after assembling and installing the gable plate on the lower part of the pier for passing the vehicle carrying the earth and sand of the excavation work. This was done by removing the mold from the end plate after placing concrete and curing and hardening.

As shown in FIGS. 13 and 14, this pier has a vehicle passage formed on a base and moving rollers mounted on the front and rear lower parts of the base.

When the tunnel invert construction work by the jetty is divided into the right side portion and the left side portion from the center in the width direction of the tunnel and half each is performed, the jetty is moved from one side in the width direction of the tunnel to the other side. Therefore, a complicated lateral movement mechanism has been provided for the moving roller portion.

In FIGS. 13 and 14, 58 is a tunnel, 70 is a heavy machine, 72 is a vehicle, 74 is a pier, 76 is a base, 78 is a moving roller, 80 is a vehicle passage, and 82 is a lifting support leg. , 84 is a vehicle guide lift, 86 is a work space, 88 is a tunnel lower part, 90 is an already-inverted construction surface with embankment, and 92 is a wind pipe.

[0009]

Since the conventional jetty is laterally moved by the lateral movement mechanism provided in the moving roller portions at the front and rear lower portions of the base, the entire load of the jetty is applied to the moving roller portions. As a result, a large moving load is applied, the moving speed is slow, and the process is delayed.

Further, the tunnel is not always composed of only a straight line portion in its entire length, and it is always the case that curved portions (curves) are scattered. When a jetty is run along this curved portion, the tunnel moves laterally. Since the moving rollers were forcibly rotated by the means, strain occurred on the jetty, and the shorter the total length of the jetty, the greater the amount of strain, and the strain made it difficult to move the jetty, and the jetty was sometimes damaged.

Further, in the conventional jetty, it is impossible to invert the lower part of the tunnel immediately after excavation in the vicinity of the tunnel face.

In view of such drawbacks, the present invention has a tunnel with a movable jetty which has a very high movement efficiency, shortens the construction period, and allows the invert construction on the lower part of the tunnel immediately after excavation close to the tunnel face. It is intended to provide an invert construction method and a mobile jetty.

[0013]

SUMMARY OF THE INVENTION According to the present invention, after excavation of an invert on the advancing side, a self-propelled mechanism is provided at a lower portion of a base through a turning lateral movement means, and outriggers are provided at both front and rear sides of the base. In the front half of the excavator immediately after excavation by raising the vehicle guide stand, the self-propelled mechanism of the movable pier with the vehicle guide stand that can be lifted and lowered in front of the
By installing them respectively, while protecting the invert concrete placing part during placement of the invert concrete while placing it in the lower part of the excavated tunnel,
It is characterized by making it possible for heavy machinery, earth and sand transport vehicles, etc. to pass through, and improving the lateral movability of the pier by elevating the outriggers and laterally oscillating the base and self-propelled mechanism by the lateral oscillating means. , Or a vehicle guide stand that can be moved up and down behind the base stand, and the self-propelled mechanism is installed in the lower part of the tunnel and the vehicle guide stand is raised and installed on the existing invert construction surface. It is characterized by being able to pass through heavy equipment, transport vehicles, etc. while protecting the vehicle, or by allowing the self-propelled mechanism to move by suspending the rail part with respect to the traveling part. It is characterized in that the thing or the self-propelled mechanism is a crawler which can be swiveled in the horizontal direction.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION A mobile jetty according to the present invention is provided with a vehicle passage 12 for passing a vehicle or the like for carrying excavated earth and sand from a tunnel face side to a tunnel pit side, and an excavated tunnel. A work space 18 for placing the invert concrete 16 in the lower portion 14 is secured, which will be described in detail below with reference to FIGS. 1 to 9.

A self-propelled mechanism 22 is disposed below the base 20 so as to be swingable and / or laterally movable via a swing lateral moving means 24.

In this example, the self-propelled mechanism 22 includes a rail portion 2 and a traveling portion 26 composed of driving rollers as shown in FIG.
Reference numeral 8 denotes a roller chain 30 and a plurality of sprockets 32 that are movably hung from the sprocket 32, and are respectively disposed on both sides of the base 20 in the width direction.

Further, the turning lateral movement means 24 has a guide frame 34 formed at the front and rear side edges of the lower portion of the base 20, to which the self-propelled mechanism 22 is attached, and a transverse frame having front and rear side edges formed in an arc shape. It is constituted by a pair of traverse cylinders 38 which are arranged between the traverse frame 36 and the base 20 by locking the arc portion 40 of the traverse cylinders 36.
Are expanded and contracted, and the transverse frame 36 is turned and / or moved laterally with respect to the base 20, whereby the self-propelled mechanism 22 is turned and laterally moved (see FIGS. 5 and 6).

The arcuate portions 40 formed on both the front and rear edges of the traverse frame 36 form a revolving space 42 between the guide frame 34 and the traverse frame 36, so that the revolving shaft can revolve and the slide mechanism can move laterally. Compared to this, there is no misalignment and smooth turning and lateral movement are possible.

Outriggers 44 for raising and lowering the base 20 together with the self-propelled mechanism 22 are disposed on both front and rear sides of the base 20.

In this example, the outrigger 44 is an English word, and is generally recognized as a support column for mounting the lower traveling frame or the subframe for the purpose of increasing the stability of the airframe, and therefore its detailed description is omitted. To do.

In front of the base 20 (on the side of the tunnel face: the left side in FIG. 1), a vehicle guide base 46 is disposed so as to be supported and fixed substantially horizontally with the base 20 so as to be lifted and lowered.

In this example, the raising and lowering of the vehicle guide board 46
The vehicle guide base 46 is pivotally supported on the base 20 so as to be tiltable, and the vehicle guide base 46 is moved up and down (tilted) via an elevating cylinder 48. The support angle of the vehicle guide base 46 is relative to the base 20. It is supported and fixed substantially horizontally by setting the angle about 2 degrees above.

The reason why the vehicle guide table 46 is supported substantially horizontally with the base 20 is that the vehicle guide table 46 is installed on the upper half excavator 50 immediately after being excavated, and the heavy machinery 52, the transportation vehicle 54, etc. For use as.

In the figure, 56 is the same vehicle guide as the vehicle guide 46 mounted on the rear side of the base 20 (on the tunnel entrance side: the right side in FIG. 1), 58 is a tunnel, and 60 is invert concrete pouring. The existing invert construction surface,
Reference numeral 62 indicates the embankment applied to the already-inverted construction surface 60.

The lower part 14 of the tunnel after the invert excavation on the side close to the tunnel face by the mobile jetty according to the present invention
The process of invert construction (placing invert concrete) on the above will be described in detail below.

First, the self-propelled mechanism 2 below the base 20 of the pier.
The second rail portion 28 is installed on the already-inverted construction surface 60 near the tunnel face, and the jetty is moved.

At this time, since the traveling section 26 of the self-propelled mechanism 22 moves on the rail section 28, the jetty is moved.
Since the second rail portion 28 is directly installed on the already-inverted construction surface 60, the loads of the base 20, the outriggers 44, and the vehicle guides 46, 56 are dispersed over the entire rail portion 28 to support the already-invert construction surface 60. The pressure can be drastically reduced.

Next, the vehicle guide table 46 in front of the base 20 is raised to be substantially horizontal to the base 20 and installed on the upper half excavator 50 immediately after excavation.

At this time, since the vehicle guide stand 46 is positioned substantially horizontally with the vehicle passage section 12 of the base 20, the vehicle passability is improved and the work space 18 can be secured wider.

Next, the tunnel lower part 14 below the vehicle guide 46 is dug into an arch shape, a gable plate (not shown) is installed, and the invert concrete 16 is placed between the gable plate and the tunnel lower part 14 to cure and cure. After that, the end plate is removed from the mold to invert the tunnel lower part 14.

The lower part of the tunnel 14 is dug in an arch shape in order to disperse the rock load concentrated on both sides of the lower part 14 of the tunnel in order to stabilize the rock mass and to form an invert concrete placing space.

Further, concrete for primary lining is placed or sprayed on the excavated tunnel lower portion 14 immediately after excavation.

During this period, the vehicle guide board 46 and the vehicle passage section 12 of the pier can be used as a passage section for the heavy equipment 52, the transportation vehicle 54, etc., and the excavation work and the excavation work of the excavated earth and sand are carried out in the conventional manner. Without having to suspend
The work can be carried out continuously, and work efficiency is greatly improved.

Next, the pier is moved to the front of the next process position (on the tunnel face).

At this time, embankment 62 is applied to protect the already-inverted construction surface 60.

Here, the process of moving the pier back and forth after the invert construction on the lower part 14 of the tunnel will be described in detail below with reference to FIGS. 7 and 8.

First, the outrigger 44 raises and supports the base 20 together with the self-propelled mechanism 22 (see FIG. 7A).

Next, the rail portion 28 of the self-propelled mechanism 22 is suspended from the traveling portion 26 and moved forward (direction of tunnel excavation, left side in FIG. 7) (see FIG. 7B).

Next, the outrigger 44 is shortened to position the rail portion 28 of the self-propelled mechanism 22 on the already-inverted construction surface 60 (see FIG. 8C).

Next, the traveling section 26 of the self-propelled mechanism 22 is moved on the rail section 28 (see FIG. 8D).

In this way, by suspending the rail portion 28 from the traveling portion 26 and moving the self-propelled mechanism 22 back and forth,
The pier can be moved very efficiently.

By repeating the above steps, the invert construction is performed on the lower part 14 of the tunnel immediately after excavation which is close to the face of the tunnel.

Further, the tunnel 58 is not always composed of only a straight line portion in its entire length, and it is always the case that curved portions (curves) are scattered. It is necessary, and the turning lateral movement process will be described in detail below based on FIG.

First, the outrigger 44 raises and supports the base 20 together with the self-propelled mechanism 22.

Next, the traverse frame 36 to which the self-propelled mechanism 22 is locked is expanded and contracted by a pair of traverse cylinders 38, so that the self-propelled mechanism 22 is turned corresponding to the curved portion of the tunnel 58 (curve). (See the arrow in FIG. 5).

Next, the outrigger 44 is shortened to position the rail portion 28 of the self-propelled mechanism row 22 on the already-inverted construction surface 60.

Next, the traverse frame 36 with the self-propelled mechanism 22 locked therein is expanded and contracted with a pair of traverse cylinders 38 to turn the base 20 in correspondence with the curved portion of the tunnel 58 (see FIG. (See arrow 5).

In this way, since the jetty is turned and moved laterally along the curved portion of the tunnel 58, there is no misalignment as compared with turning by the turning axis and turning lateral movement by the slide mechanism, and smooth turning and lateral movement are possible. Not only will this be possible, but distortion will not occur even if the total length of the jetty is short, mobility will be good, and the jetty will not be damaged.

The step of laterally moving the pier to the other side of the tunnel 58 (left side in FIG. 2) after the completion of the earth and sand carrying-out work on one side of the tunnel 58 will be described in detail with reference to FIG.

First, the outrigger 44 raises and supports the base 20 together with the self-propelled mechanism 22.

Next, the transverse frame 36 to which the self-propelled mechanism 22 is locked is expanded and contracted by a pair of transverse cylinders 38, so that the self-propelled mechanism 22 is moved to the other side in the width direction of the base 20 (see FIG. 2).
The left side) (see the lower arrow in FIG. 6).

Next, the outrigger 44 is shortened to position the rail portion 28 of the self-propelled mechanism row 22 on the already-inverted construction surface 60.

Next, the traverse frame 36 with the self-propelled mechanism 22 locked is expanded and contracted with the pair of traverse cylinders 38 to laterally move the base 20 to the other side (the other left side in FIG. 2).

In this lateral movement, as in the case of the turning lateral movement, there is no misalignment, smooth turning and lateral movement are possible, and even if the total length of the jetty is short, no distortion occurs and the movement It is very good and the pier is not damaged.

Further, the step of performing the inversion at the location away from the tunnel face by the mobile jetty according to the present invention will be described in detail with reference to FIGS. 10 and 11.

First, the self-propelled mechanism 2 under the base 20 of the pier.
The second rail portion 28 is installed on the excavated tunnel lower portion 14 on the tunnel face side, and the jetty is moved.

Next, the vehicle guide table 56 behind the base 20 is lowered and installed on the already-inverted construction surface 60 on which the embankment 62 is newly provided.

At this time, a heavy machine, a vehicle, etc. are passed on the vehicle guide table 56 and the vehicle passage section 12, and the work space 18 is secured below the vehicle guide table 56.

Next, the work space 18 under the base 20
The gable plate 64 is installed on the lower part of the tunnel, and the invert concrete 16 is placed between the gable plate 64 and the lower part 14 of the tunnel.
Invert to 4.

Next, the jetty is moved to the front of the next process position (on the tunnel face).

Therefore, the mobile jetty according to the present invention enables the invert construction to be performed at a position away from the tunnel face, or near the tunnel face as in the previous example.

Further, at the time of turning lateral movement of the movable jetty and at the time of forward and backward movement, the vehicle guides 46 and 56 arranged in front of and behind the base 20 are raised.

Further, another example is shown in FIG.

In this example, the self-propelled mechanism 22 of the first and second examples is
This is a crawler 66 that can be swiveled in the horizontal direction.

By this crawler 66 which can be swiveled in the horizontal direction, the self-propelled mechanism 22, the traverse frame 36, and the traverse cylinder 38 of the previous example can be omitted and the structure can be simplified.

Since the method of use of this example is the same as that of the first and second examples, it will be omitted.

In the first and second examples, the self-propelled mechanism 2
It is possible to freely extend and retract 2 with respect to the base 20.

Inverting concrete in the work space 18 to the lower part 14 of the tunnel is performed by the base 20.
Although it is a separate end plate (not shown), it is obvious that the end plate is integrally hung with the base 20 so as to be lifted and lowered.

Further, in the self-propelled mechanism 22, the rail portion 28 is provided on the traveling portion 26, the roller chain 30 and the sprocket 32.
Although the crawler 66 or the crawler 66 is movably suspended through the other, other structures can be freely used.

Further, although the embankment 62 is applied to protect the already-inverted surface 60, it is obvious that the operation of embankment may be omitted if it is not necessary to prevent damage to the inverted surface.

A dust collector (not shown) is provided above the base 20.
Since the dust collector can be moved along with the movement of the pier by installing the, there is no work to move the dust collector to the tunnel face side separately from the pier in accordance with tunnel excavation, and work time can be shortened. You can

Further, in all the examples, the vertically movable vehicle guides 46 and 56, which are substantially horizontal to the base 20, are arranged in front of and behind the base 20, respectively. It is not necessary to raise 56 to support it substantially horizontally with the base 20, and it suffices if it is simply provided with a tiltable mechanism.

Further, as shown in FIGS. 9 and 11, it is obvious that the vehicle guides 46 and 56 can be tilted and supported upward to such an extent that they do not hinder the heavy equipment during the earth and sand carrying-out work.

Also, at the time of placing the invert concrete,
It is obvious that a reinforcing material such as a reinforcing bar should be provided.

In an emergency, front and rear vehicle guides 46,
It is obvious that 56 is installed in the lower part of the tunnel 14 and used for evacuation by passing heavy equipment, transport vehicles and the like.

Further, although it is a substantially semi-circular tunnel, it can be used also for a circular tunnel such as an undersea tunnel or a concrete laying (lining) for sewer.

[0077]

According to the tunnel invert construction method and the movable jetty by the movable jetty according to the present invention, the self-propelled mechanism is provided at the lower portion of the base via the turning lateral movement means, and the outriggers are provided at both front and rear sides of the base. In order to invert the vehicle guide table that can be moved up and down in front of the base by the movable piers that are respectively arranged, while protecting the invert concrete placing part during placing invert concrete curing,
It enables passage of heavy machinery, earth and sand transport vehicles, etc., and the lateral movement of the pier is improved by raising and lowering the outrigger and the lateral movement of the base and self-propelled mechanism by the lateral turning movement means, and there is no misalignment and smooth. Not only is it possible to turn and move laterally, but distortion does not occur even if the total length of the pier is short, mobility is good, and there is no damage.

Further, since the self-propelled mechanism is arranged under the base, it is possible to perform the invert construction on the lower part of the tunnel immediately after the excavation which is close to the tunnel face, especially when the bedrock is soft. (Excavation surface) can be stabilized early.

Further, by arranging the vehicle guide table at the rear of the base, it is possible to carry out invert construction at a position separated from the tunnel face by a predetermined distance.

By suspending the rail part with respect to the traveling part so that the self-propelled mechanism can move, the base is raised by the outrigger together with the self-propelled mechanism when the pier turns and moves laterally. Turn the self-propelled mechanism via the moving means,
After laterally moving, the outrigger is shortened to install the rail part of the self-propelled mechanism on the lower part of the tunnel or the existing invert construction surface, and then the base is turned and laterally moved by the turning lateral movement means, thereby Since the vehicle is moved laterally, turning and lateral movement in the curved portion of the tunnel can be performed very easily and smoothly.

In the front-rear movement, after the base is raised by the outrigger together with the self-propelled mechanism, the rail portion of the self-propelled mechanism is hung on the traveling part and moved back and forth, and then the outrigger is shortened to perform self-movement. Since the rail part of the running mechanism is installed on the lower part of the tunnel or the invert construction surface, it is moved back and forth by the self-propelled mechanism, so that the back and forth movement of the pier can be performed very easily and smoothly.

For this reason, the pier movement time can be shortened and the construction period can be shortened. In addition to the fact that it is possible to invert construction near the tunnel face, it is also possible to carry out the invert construction at a place away from the tunnel face as in the conventional case. It is also possible to perform the invert construction for the part near the tunnel face and the part away from the tunnel face.

Further, the structure becomes simpler by using the crawler which can freely rotate in the horizontal direction as the self-propelled mechanism.

[Brief description of drawings]

FIG. 1 is a side view of a mobile jetty according to the present invention.

FIG. 2 is a front view of the same.

FIG. 3 is an enlarged side view of the same.

FIG. 4 is an enlarged plan view of relevant parts.

FIG. 5 is an enlarged plan view of an essential part showing a turning state of the same.

FIG. 6 is an enlarged plan view of an essential part showing a lateral movement state of the same.

FIG. 7 is a side view showing the first and second steps of the same for the front-rear movement.

FIG. 8 is a side view showing the third and fourth steps in the same front-back movement.

FIG. 9 is a side view of the main part of the same when working on the tunnel face.

FIG. 10 is a side view showing another usage state.

FIG. 11 is a side view of the main part of the tunnel pit side at the time of work.

FIG. 12 is a side view showing another example.

FIG. 13 is a front view showing a conventional example.

FIG. 14 is a side view of the same.

[Explanation of symbols]

12 vehicle passage 14 tunnel bottom 16 Invert concrete 18 working space 20 bases 22 Self-propelled mechanism 24 Turning lateral movement means 26 Running section 28 Rail 44 Outrigger 46,56 Vehicle information board 50 upper half excavator 52 heavy machinery 54 transport vehicles 58 tunnel 60 Inverted construction surface 66 Crawler

Continued front page    (72) Inventor Shinji Masada             Gifu Prefecture, Motosu-gun, Masashi-cho, 144, 14 Shijo             Industry Co., Ltd. (72) Inventor Daisuke Sumi             Gifu Prefecture, Motosu-gun, Masashi-cho, 144, 14 Shijo             Industry Co., Ltd. F term (reference) 2D055 BA05 CA08 DA03 GB11 KB08                       LA17

Claims (7)

[Claims] 1. In the tunnel invert construction method,
After excavation of the invert on the advancing side, the self-propelled mechanism (22) via the turning lateral movement means (24) at the bottom of the base (20), the outriggers (44) on both front and rear sides of the base (20), The self-propelled mechanism (22) of the mobile pier, which is equipped with the vehicle guides (46) that can be moved up and down in front of the base (20), is attached to the vehicle guide (46) on the already-inverted construction surface (60). )) And the upper half excavator (5
(0), respectively, by placing them on the lower part (14) of the tunnel that has been excavated by the invert, during protection of the invert concrete, the invert concrete placing part is protected and the heavy equipment (52) and earth and sand transport vehicle (54 ), Etc., and the outrigger (44) can be moved up and down and turned laterally.
A tunnel invert construction method using a mobile pier, characterized in that the lateral movability of the pier (20) and the self-propelled mechanism (22) according to 4) is improved by improving the lateral movability of the pier. 2. In the method of constructing a tunnel invert,
After excavation of the invert on the advancing side, the self-propelled mechanism (22) via the turning lateral movement means (24) at the bottom of the base (20), the outriggers (44) on both front and rear sides of the base (20), The self-propelled mechanism (22) of the mobile pier, which is equipped with the vehicle guides (56) that can be moved up and down behind the base (20), is installed in the lower part of the tunnel (14).
By raising (56) and installing it on the existing invert construction surface (60), respectively, it is possible to protect the invert concrete placing part during the invert concrete curing while placing it in the lower part (14) of the tunnel that was excavated by invert. , Heavy machinery (5
2), allowing the passage of earth and sand transport vehicles (54), etc., and elevating and lowering the outrigger (44), and the base (2
A tunnel invert construction method using a mobile pier, characterized in that the lateral movability of the pier is improved by the lateral traverse of 0) and the self-propelled mechanism (22). 3. The movement according to claim 1 or 2, wherein the self-propelled mechanism (22) is movable by suspending a rail portion (28) with respect to a traveling portion (26). Method of tunnel invert construction using a pier. 4. The method of tunnel invert construction by a movable pier according to claim 1, wherein the self-propelled mechanism (22) is a crawler (66) which can be horizontally swiveled. 5. A vehicle passage part (12) for passing a transport vehicle for carrying the excavated earth and sand from the tunnel face side to the tunnel pit side is provided, and an invert concrete () is provided at the lower part of the excavated tunnel (14). In the mobile pier to secure the working space (18) for placing the (16), the rail part (2
A self-propelled mechanism (22) that hangs 8) and is movable is arranged so that it can be horizontally swung and horizontally moved through the turning lateral movement means (24), and it is located on both front and rear sides of the base (20). The base (20) is a self-propelled mechanism
An outrigger (44) for raising and lowering together with (22) is arranged, and in turning lateral movement, after raising the base (20) together with the self-propelled mechanism (22) by the outrigger (44), turning lateral movement. After swinging and laterally moving the self-propelled mechanism (22) via the means (24), the outriggers (44) are shortened so that the rail portion (28) of the self-propelled mechanism (22) is lower than the tunnel (14) or already. After installation on the invert construction surface (60), the base (20) is swung and moved laterally by the swivel lateral movement means (24) to swivel and laterally move the jetty, and the outrigger (44 ) To raise and support the base (20) together with the self-propelled mechanism (22), then hang the rail section (28) of the self-propelled mechanism (22) on the traveling section (26) and move it back and forth. After shortening the outrigger (44) and installing the rail part (28) of the self-propelled mechanism (22) on the tunnel lower part (14) or the existing invert construction surface (60), the self-propelled mechanism (22) is used. Mobile pier, characterized in that moving back and forth pier. 6. A vehicle guide at least in front of the base (20).
(46) is arranged so that it can move up and down, and this raised vehicle guide
The mobile jetty according to claim 5, characterized in that (46) is installed on the upper half excavator (50) to enable invert construction on the lower part (14) of the tunnel immediately after excavation adjacent to the tunnel face. 7. The mobile jetty according to claim 5 or 6, wherein the self-propelled mechanism (22) is a crawler (66) capable of swinging in a horizontal direction.