JP2003322000A - Tunnel invert construction method by movable pier and the movable pier - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To smoothly carry out an invert construction even in a narrow tunnel. <P>SOLUTION: After an invert on the progress side has been excavated, a base 20 is divided into two parts in the lateral direction, these bases 20 are fitted into at least a pair of guide pipes 22 arranged in front and behind from both sides in the lateral direction, a pair of outriggers 26 are respectively arranged to the guide pipes 22 through lateral moving means 24, the front of a movable pier formed by arranging travelling mechanisms 30 to the lower parts in front and behind of the bases 20 is installed on the lower part 14 of the tunnel, the rear thereof is installed on the existing inverted construction surface 50 to enable a person to pass on the pier during the curing of an invert concrete, the rising and falling of each outrigger 26, the lateral movement of each base 20 is widened by the lateral moving means 24 and, at the same time, the lateral mobility of the pier is promoted. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tunnel invert construction method and a mobile jetty by a mobile jetty which can smoothly perform tunnel invert construction even in a narrow tunnel.

[0002]

2. Description of the Related Art Originally, a tunnel was constructed by excavating a rock mass with an excavator, then performing a primary lining, driving reinforcement materials such as anchor bolts into the rock mass, reinforcing the rock mass, and then excavating the tunnel inner wall surface and It was done by placing concrete for secondary lining in the lower part of the tunnel and curing the placed concrete.

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 behind, at any time, from the tunnel face side to the tunnel well 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 on the right side (or left side) from the vehicle to a vehicle such as a dump truck that is vertically arranged on the same side in the width direction of the tunnel, and then carries it out. The vehicle was moved to the other side in the width direction of the tunnel, for example, from the center to the left side (or the right side), and the sediment on the other side in the width direction of the tunnel was carried out (see FIG. 12).

At this point, invert construction at the lower part of the excavated tunnel on the side of the tunnel pit is carried out by assembling and installing the gable plate at 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. 12 and 13, this pier has a vehicle passage formed on a base and drive rollers mounted on the front and rear lower parts of the base.

To use this jetty, first, the drive roller at the front of the jetty is located above the excavated tunnel, and the drive roller at the rear of the jetty is located at the tunnel pit side (right side in FIG. 13).
After moving each of the existing invert construction surface of, the pier is supported and fixed.

[0007] Next, a vehicle carrying out sediment is passed through the vehicle passage of the pier, and a gable board is assembled and installed in the work space under the tunnel secured by the pier, and invert concrete is placed under the tunnel. To do.

Next, after the curing of the cast invert concrete, the end plate is removed from the mold.

Next, the pier is moved to the tunnel face.

These operations were repeated to invert the lower part of the tunnel.

Further, when this work is divided into a right side portion and a left side portion from the center in the width direction of the tunnel and halved, a lateral movement mechanism for moving the pier from one side in the width direction of the tunnel to the other side is provided. It was placed on the lifting support legs that raise and lower the pier.

[0012] Further, none of the piers are equipped with a widening mechanism.

In FIGS. 12 and 13, 36 is a tunnel, 60 is a heavy machine, 62 is a vehicle, 64 is a pier, 66 is a base, 68 is a drive roller, 70 is a vehicle passage, 72 is a lifting support leg, Reference numeral 74 is a vehicle guide lift, 76 is a work space, 78 is a tunnel lower portion, and 80 is an already-inverted construction surface.

[0014]

In the conventional jetty, it is impossible to pass a heavy machine wider than the jetty in the work space under the jetty at the time of invert construction on the lower part of the tunnel.

Further, in a narrow tunnel, the excavation work space between both sides of the jetty and the inner wall surface of the tunnel becomes narrower, and the excavation work by heavy equipment is forced in this narrow excavation work space, resulting in a marked decrease in workability. Was.

When there is no excavation work space between the both sides of the jetty and the inner wall surface of the tunnel, the excavation work of the excavated earth and sand by the vehicle is interrupted and the excavation work is performed by the heavy equipment in front of the jetty. It was necessary to carry out smooth tunnel invert construction.

In view of such drawbacks, it is an object of the present invention to provide a tunnel invert construction method and a mobile jetty by a mobile jetty which can smoothly perform tunnel invert construction even in a narrow tunnel. It is a thing.

[0018]

According to the present invention, in the construction of a tunnel invert, after excavation of the invert on the advancing side,
The base is divided into two in the width direction, and each of the two divided bases is fitted and inserted into at least a pair of guide pipes arranged side by side in the width direction from both sides in the width direction, and the guide pipes are provided with a lateral moving means. A pair of outriggers are installed respectively, and the front part of the movable pier with front and rear lower parts of each base is installed in the lower part of the tunnel immediately after excavation, and the rear part is the inverted surface. By installing it, it will be possible to pass on the pier during invert concrete curing that is placed in the lower part of the tunnel that has been excavated, and it will be widened by raising and lowering each outrigger and lateral movement of each base by the lateral movement means. The feature is that the lateral mobility of the pier is improved and the tunnel invert construction is performed smoothly even in a narrow tunnel.

[0019]

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. This is for securing a working space 18 for placing the invert concrete 16 in the lower portion 14, and will be described in detail below based on FIGS. 1 to 11.

The base 20 is divided into two in the width direction, and the two divided bases 20 are arranged in parallel in the front and rear directions.
Are fitted from both sides in the width direction.

In this embodiment, the guide pipe 22 is provided at the front and rear end portions and the central portion of the base 20, and lateral movement means 24, which will be described later, is provided.
2 guide pipes 22 for horizontal movement with a total of 4
Between the guide pipes 22 for lateral movement, three guide pipes 22 having no lateral movement means are arranged, that is, a total of seven guide pipes 22 are provided.

A pair of outriggers 26 are disposed on each guide pipe (in this example, a guide pipe for lateral movement) 22 via lateral movement means 24.

In the present embodiment, the lateral moving means 24 is a traverse cylinder 28 arranged between the upper ends of the outriggers 26 and the bases 20, and the traverse cylinders 28 are expanded and contracted so that the bases 20 and By laterally moving each outrigger 26 in the same direction or in the opposite direction with respect to the guide pipe 22, the jetty is laterally moved or widened (see FIGS. 5 to 11).

Also, the outrigger 26 is of English (ou
Trigger), for the purpose of increasing the stability of the aircraft,
Since it is generally recognized as a column for mounting the lower traveling frame or the subframe, detailed description thereof will be omitted.

A pair of outriggers 26 are provided on each of the guide pipes 22 at the front and rear ends of the base 20, and a total of four outriggers are provided.
Individually arranged.

Traveling mechanisms 30 are provided on the front and rear lower portions of each base 20, respectively.

In this example, the traveling mechanism 30 is a traveling device in which wheels such as tires are mounted on the driven shaft.

In the figure, reference numeral 32 is a tiltable vehicle guide table disposed in front of and behind the base 20, 34 is a protective sheet arranged between the bases 20 when the pier is widened, 36 is a tunnel, and 38 is a tunnel.
Is a heavy machine, 40 is a transportation vehicle for carrying out earth and sand, 42 is an inspection passage formed at the time of invert construction on the lower part 14 of the tunnel, 44 is a passage form, 46 is a gable plate, 48 is a passage form 44
Further, a form moving mechanism for suspending and moving the end plate 46 at the lower part of the pier, and 50, an already-inverted construction surface on which the invert concrete is placed.

The method of invert construction by the mobile jetty according to the present invention will be described in detail below.

First, the traveling mechanism 30 under each base 20 at the front of the pier (left side in FIG. 1) is installed in the tunnel bottom 14
Then, the traveling mechanisms 30 below the respective bases 20 in the rear part (right side in FIG. 1) are respectively installed on the already-inverted construction surface 50, and the pier is moved.

At this time, in order to protect the already-inverted surface 50, it is desirable to apply embankment if necessary.

Next, the work space 18 under the base 20
The passage formwork 44 and the end plate 46 are installed in the passage form, and the invert concrete 16 is placed between the passage formwork 44, the end plate 46 and the lower part of the tunnel 14 and cured to cure, and then the passage formwork 44 and the end plate 46 are released from the mold. Then, the inspection passage 42 is provided in the lower part 14 of the tunnel.
And the invert construction is completed.

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

In addition, the vehicle passing portion 12 of the pier is set to the transport vehicle 4
The process of widening the pier so that the heavy equipment 38 wider than 0 can pass through will be described in detail below with reference to FIGS.

First, each outrigger 26 is shortened and hung on each base 20, and each front and rear traveling mechanism 30 of each base 20 is suspended.
To support (see FIG. 5 (A)).

Next, by expanding and contracting each of the traverse cylinders 28 which are the lateral moving means 24, each of the outriggers 26 is moved to both sides of the tunnel 36 in the width direction (see FIG. 5B).

At this time, in FIG. 5B, the left outrigger 26 is moved to the left side, and the right outrigger 26 is moved to the right side.

Next, the outriggers 26 are extended to vertically support the bases 20 together with the traveling mechanisms 30 (see FIG. 5).
(See (b)).

Next, the traverse cylinders 28, which are the lateral moving means 24, are expanded and contracted to move the bases 20 to both sides of the tunnel 36 in the width direction (FIG. 6).
(See (c)).

At this time, the base 2 on the left side in FIG.
0 is moved to the left, and the right base 20 is moved to the right.

Next, each outrigger 26 is shortened and hung on each base 20, and each front and rear traveling mechanism 30 of each base 20 is suspended.
To support (see FIG. 6D).

Next, the protective sheet 34 is placed between the widened bases 20.

In this way, the pier is widened from the state shown in FIG. 7A to the state shown in FIG. 7B in accordance with the width of the heavy equipment 38 and the vehicle 40 which pass the vehicle passage 12.

The step of laterally moving the pier to the other side in the width direction of the tunnel 36 after the completion of the unloading work of the one side of the tunnel 36 will be described in detail below with reference to FIGS. 8 and 9.

First, each outrigger 26 is shortened and hung on each base 20, and each front and rear traveling mechanism 30 of each base 20 is suspended.
To support it (see FIG. 8A).

Next, by expanding and contracting each of the traverse cylinders 28 which are the lateral moving means 24, the respective outriggers 26 are laterally moved to the other side in the width direction of the tunnel 36 (see FIG. 8B).

At this time, in FIG. 8B, the outriggers 26 on the left and right sides are respectively moved to the right side.

Next, the outriggers 26 are extended and the respective bases 20 are lifted and supported together with the respective traveling mechanisms 30.

Next, by expanding and contracting each of the traverse cylinders 28 which are the lateral moving means 24, each of the bases 20 is laterally moved to the other side in the width direction of the tunnel 36 (FIG. 9).
(See (c)).

At this time, in FIG. 9C, the bases 20 on the left and right sides are respectively moved to the right side.

Next, each outrigger 26 is shortened and hung on each base 20, and each front and rear traveling mechanism 30 of each base 20 is suspended.
To support (see FIG. 9D).

In this way, the pier is laterally moved to the other side of the tunnel 36.

Further, FIGS. 10 and 11 show a step of laterally moving the widened jetty.

The horizontal movement process of this example is also performed in the same manner as in the previous example, and therefore its description is omitted.

Therefore, not only can the heavy equipment wider than the pier be passed during the tunnel invert construction by widening it in accordance with the widths of the heavy equipment and vehicles, but also in the narrow tunnel, it can be connected to both sides of the pier. It is possible to secure a sufficient excavation work space between the tunnel inner wall surface and the excavation workability with heavy equipment.

Further, unlike the conventional case, it is not necessary to carry out the excavation work of the excavated earth and sand by the vehicle, and it is not necessary to perform the excavation work by the heavy machine in front of the pier, so that the tunnel invert construction can be smoothly carried out.

When the movable pier is moved forward and backward, when it is widened and when it is moved laterally, the vehicle guides 32 arranged in front of and behind the base 20 are raised.

Further, in all the examples, the number of the guide pipes 22 is four with the lateral moving means 24 and three without the lateral moving means 24, which is seven in total, but with the lateral moving means 24. It suffices to arrange at least one pair of front and rear in parallel, and the effects of the present invention can be sufficiently obtained even with a pair of front and rear.

Further, each traveling mechanism 30 is allowed to extend and contract with respect to the base 20, and the tunnel lower portion 14 and the invert construction surface 5 are provided.
It is self-evident to buffer the step with 0.

Further, the traveling mechanism 30 is a traveling device in which wheels are attached to the driven shaft, but it is free to employ another structure capable of moving back and forth or a self-propelled mechanism.

Further, it is desirable to apply embankment to protect the already-inverted surface 50 on which the invert concrete 16 has been placed in the lower part of the tunnel 14, but if it is not necessary to prevent damage to the already-inverted surface 50. It is self-evident that the work of applying embankment can be omitted.

In an emergency, it is obvious that the traveling mechanism 30 before and after the base 20 is installed in the lower part 14 of the tunnel so that heavy equipment, transport vehicles, etc. can be passed through and used for evacuation.

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

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 addition, the inspection passage 42 at the time of invert construction
However, it is obvious that it can also be used for invert construction in which the inspection passage 42 is not formed.

Further, although it is a substantially semi-circular tunnel, it can be used also for a circular tunnel, for example, a submerged tunnel, concrete laying (lining) of sewer or the like.

[0067]

According to the movable jetty of the present invention, the base is divided into two in the width direction, and each of the two divided bases is fitted into the guide pipe from both sides in the width direction, and is horizontally attached to the guide pipe. Since a pair of outriggers are arranged via the moving means, the outriggers are moved up and down, and the base is moved laterally by the lateral moving means to expand the width according to the width of heavy equipment and vehicles, making it wider than the pier during tunnel invert construction. Not only can heavy equipment be passed, but even in a narrow tunnel, a sufficient excavation work space can be secured between both sides of the pier and the inner wall surface of the tunnel. Can be improved.

Further, it is not necessary to carry out the excavation work of excavated earth and sand by a vehicle as in the conventional case, and it is not necessary to perform the excavation work by a heavy machine in front of the pier, so that the tunnel invert construction can be smoothly carried out.

Further, in the lateral movement, the outriggers are shortened, suspended and supported by the base, and then the respective bases are moved to the other side in the width direction of the tunnel through the lateral movement means, and then the outriggers are extended. Then, after the bases are lifted and supported, each base is moved to the other side in the width direction of the tunnel through the lateral movement means, so that the jetty can be laterally moved extremely easily.

[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 a plan view showing a widened state of the pier.

FIG. 4 is a front view of the same.

FIG. 5 is an enlarged front view of essential parts showing the first and second steps in widening the pier.

FIG. 6 is an enlarged front view of an essential part showing the same third and fourth steps.

FIG. 7 is an enlarged front view of an essential part showing the pier widening step in the guide pipe portion in which the lateral moving means is not provided.

FIG. 8 is an enlarged front view of the essential parts showing the first and second steps in the lateral movement of the jetty when the width is not widened.

FIG. 9 is an enlarged front view of an essential part showing the third and fourth steps.

FIG. 10 is an enlarged front view of the essential parts showing the first and second steps in the lateral movement of the jetty during widening.

FIG. 11 is an enlarged front view of an essential part showing the same third and fourth steps.

FIG. 12 is a front view showing a conventional example.

FIG. 13 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 Guide pipe 24 Lateral movement means 26 Outrigger 30 traveling mechanism 36 tunnel 38 heavy machinery 50 Inverted construction surface

Continued front page    (72) Inventor Daisuke Sumi             Gifu Prefecture, Motosu-gun, Masashi-cho, 144, 14 Shijo             Industry Co., Ltd. F term (reference) 2D055 BB02 CA08 GB11 KC00 KC06

Claims (2)

[Claims] 1. In the tunnel invert construction method,
After excavation of the invert on the advancing side, the base (20) is divided into two in the width direction, and each of the two divided bases (20) is arranged in the front and rear side by at least a pair of guide pipes (22) with a width. The guide pipes (22) are fitted with a pair of outriggers (26) via the lateral movement means (24), and the traveling mechanism (30 ) Is placed at the bottom of the tunnel (14) immediately after excavating the front part of the mobile jetty,
By installing the rear part on the existing invert construction surface (50) respectively, it is possible to pass over the pier during the invert concrete curing that is placed in the lower part of the tunnel (14) that was excavated by invert, and each outrigger (26) rises and falls. , Lateral movement means (24)
The method of tunnel invert construction using a movable jetty is characterized by widening each base (20) by lateral movement and improving the lateral mobility of the jetty so that tunnel invert construction can be performed smoothly even in a narrow tunnel. . 2. A vehicle passage part (12) for passing a vehicle or the like for carrying the excavated earth and sand from the tunnel face side to the tunnel pit side, and a lower part of the excavated tunnel (1).
In the movable pier to secure the work space (18) for placing the invert concrete (16) in 4), the base (20) is divided into two in the width direction, and each of these two divided bases ( 20)
At least a pair of guide pipes (2
2) Insert the guide pipes (22) by inserting them from both sides in the width direction.
A pair of outriggers (26) are respectively arranged via the lateral movement means (24), and the traveling mechanism (30) is provided at the front and rear lower parts of each base (20).
The width of each outrigger (26)
After shortening, and supporting each base (20) under suspension, after moving each outrigger (26) to both sides in the width direction of the tunnel (36) via the lateral movement means (24), Outrigger (2
6) Extend and support each base (20) ascending, and then move each base to both sides in the width direction of the tunnel (36) via the lateral movement means (24).
By moving (20) respectively, the pier is widened, and during lateral movement, each outrigger (26) is shortened,
After suspending and supporting each base (20), after moving each outrigger (26) to the other side in the width direction of the tunnel (36) through the lateral movement means (24), each outrigger (26 ) Is extended, and the base (20) is lifted and supported, and then each base (20) is moved to the other side in the width direction of the tunnel (26) via the lateral movement means (24). A mobile pier characterized by laterally moving the pier.