JP2002235495A - Concrete placing method and device for tunnel widening work - Google Patents

Abstract

PROBLEM TO BE SOLVED: To install a protector and place concrete in a widened tunnel extremely easily in the tunnel widening work. SOLUTION: Concrete is placed by using a form 16 capable of securing a vehicle traffic section 18 below it in the widening work of the tunnel 12. The protective member 20, which is suspended from the vehicle traffic section 18 of the form 16 along the whole length of the form 16 and is opened in the longitudinal direction, is installed in the vehicle traffic zone 24 of the tunnel 12 to protect passing vehicles, and concrete 14 is placed between the form 16 and the inner wall face 40 of the widened tunnel.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for placing concrete, mainly concrete for secondary lining, in a tunnel widened by widening work. In addition, in this specification, "casting" refers to filling mud-like concrete that has not been cured and hardened between the formwork and the inner wall surface of the tunnel.

[0002]

2. Description of the Related Art Originally, widening work of an existing tunnel is shown in FIG.
As shown in FIG. 5 and FIG. 5, the width is increased outward uniformly from the outer periphery of the tunnel. However, as shown in FIG.

Also, in a tunnel during widening work, the vehicle is protected from dust, concrete debris, etc. generated by excavation in order to allow the construction to proceed while the vehicle is running, rather than blocking the entire vehicle from traffic. Protection was installed over the entire length of the tunnel, including the bottom of the formwork for casting concrete into the widened tunnel.

[0004] In this protective work, cover plates are fixed to both side surfaces and upper side surfaces of a frame body formed of steel material, and are formed in a substantially square frontal shape in which the bottom plate is omitted by opening the front and rear directions and the lower side. .

[0005] In addition, a tunnel is often provided with a straight portion and a curved portion, and in the curved portion, protective works have been installed in advance along the curved portion.

[0006] In addition, concrete placement into the widened tunnel, mainly for secondary lining, is carried out after the concrete placement is completed, folded forward, transported, unfolded and installed again. This was done using a movable formwork in which concrete was cast at each location.

For this reason, when moving the movable formwork,
They were moving around avoiding the protective equipment installed in advance.

In addition, concrete is placed between the movable formwork and the inner wall of the tunnel by lowering the lap side (opposite to the tunnel digging side), lowering the wife side (tunnel digging side), and uppering the lap side. , And is usually placed sequentially on the upper part of the wife's side.

[0009] A dust collector for collecting dust, concrete debris, and the like generated by excavation in tunnel widening work is mounted on the movable formwork.

In FIGS. 4 to 6, reference numeral 42 denotes an existing tunnel, 44 denotes a widened tunnel, and 46 denotes a protector.

[0011]

Conventionally, in tunnel widening work, as a pre-process of the work, it is necessary to install a protective work (protector) for protecting the passing vehicles in advance over the entire length of the tunnel, which is complicated. Not only that, but it was a factor in delaying the construction period.

[0012] Further, in the movement of the movable formwork, since ordinary vehicles pass through the protective work installed below the movable formwork, it is necessary to move the movable formwork while avoiding the protective work. In the case of widening in the state of being eccentric from the center of the tunnel, in the case of the curved part of the tunnel,
It had to be done more carefully and the workability was extremely poor.

SUMMARY OF THE INVENTION In view of the above drawbacks, the present invention provides a concrete casting method in tunnel widening work in which protection works can be installed and concrete can be cast into the widened tunnel very easily. And an apparatus.

[0014]

SUMMARY OF THE INVENTION The present invention relates to a method and an apparatus for placing concrete using a formwork capable of securing a vehicle traffic section below during widening work of a tunnel.
It was suspended along the entire length of the formwork in the vehicle traffic section of the formwork,
Protectors with open front and rear sides to protect the passing vehicles are installed in the tunnel's vehicle lane, and after protecting the passing vehicles, concrete is poured between the formwork and the widened inner wall of the tunnel. Or a protector capable of moving horizontally or / and vertically with respect to a formwork, and being installed along a vehicle lane of a tunnel, or a protector. The lower part of both sides can be extended and contracted, and the lower edge on both sides of the protective structure is in close contact with the vehicle lane of the tunnel, or the protective structure can be bent in the length direction to accommodate the vehicle lane of the tunnel It is characterized by improving the performance.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A concrete casting apparatus for widening a tunnel according to the present invention is mounted on a movable formwork 16 for placing concrete 14 in a tunnel 12, mainly concrete for secondary lining. Figure 1
As shown in FIG. 3, it has the following configuration.

In the present specification, "vehicle lane" refers to a vehicle road portion of an existing tunnel.

A vehicle traffic section 18 is secured below the formwork 16.

The vehicle 1 has a form 1
A protector 20 having an opening in the front-rear direction for protecting the passing vehicle is suspended along the full length of the mold 6 so as to be movable in the horizontal direction with respect to the formwork 16.

In this embodiment, the means for moving the protective member 20 in the horizontal direction with respect to the mold 16 is an extendable cylinder 22.

In order to make the lower edges of both sides of the protective structure 20 adhere to the vehicle lane 24 of the tunnel 12, the lower portions on both sides of the protective structure 20 are extendable and contractible.

The extension means at the lower part on both sides of the protective member 20 has a double structure at the lower part of the protective member 20, and the inner protective member 26 has a double structure.
Is a telescopic jack 28 for vertically moving the protective jack 20 with respect to the protective worker 20.

Further, the protective member 20 is formed in a U-shape by opening the front and rear directions and a lower portion by a frame and a cover plate, and is formed in a shape omitting a bottom plate. In order to improve compatibility, the hinge structure 30
It is bendable by adopting.

The reason why the lower part of the protective member 20 is opened to form a U-shape and the bottom plate is omitted is to reduce the weight of the protective member 20 and to improve the handleability.

In the drawing, reference numeral 32 denotes a drive unit for moving the form 16; 34, a secondary lining unit; 36, an excavation unit;
Indicates a protector for an excavated portion, and 40 indicates an inner wall surface of the tunnel which is widened.

A method of placing concrete 14, mainly concrete for secondary lining in widening work of the tunnel 12 using the present apparatus will be described in detail below.

First, the form 16 is moved to a predetermined position of the tunnel 12 whose width has been widened by excavation.

At this time, the wrap side (the side opposite to the tunnel excavation side) of the formwork 16 needs to be overlapped with the existing secondary lining portion 34.

Next, the protective work 20 is moved to a predetermined portion of the vehicle lane 24 of the tunnel 12 below the formwork 16 and installed.

At this time, the protection man 20 is moved in the horizontal direction with respect to the formwork 16 by the telescopic cylinder 22, and the protection man 20 is bent by the hinge structure 30 in the longitudinal direction, so that the plane shape of the vehicle lane 24 is changed. , For example, corresponding to a curve.

The lower edges of both sides of the protective structure 20 are expanded and contracted by the expansion jacks 28 so as to correspond to the shape of the vehicle lane 24 of the tunnel 12 such as the inclination of the vehicle. It can be in close contact with each of the traffic belts 24, and is very useful when using a protective work 20 having a U-shape with an opening at the bottom as in this example and omitting the bottom plate.

Therefore, the vehicle traffic zone 24 of the tunnel 12
Is reliably protected by the protective work 20, so there is no influence of dust, concrete debris generated by tunnel widening work on vehicles passing through the vehicle lane 24, and concrete debris generated at the time of placing concrete, etc. The vehicle can pass safely.

Next, the peripheral edge on the wife side of the formwork 16 is securely covered with the wife edge.

Next, concrete 14 is cast between the formwork 16 and the widened inner wall surface 40 of the tunnel.

At this time, the concrete 14 is vibrated via a vibrator (not shown) in accordance with the amount of concrete poured.
It is desirable to improve the strength and durability of the concrete after curing and hardening by compacting and removing bubbles.

Next, after the concrete placement at the place where the form 16 is installed is completed, the cast concrete 14 is cured and hardened, and the form 16 is removed from the mold.

The removal of the mold 16 completes the placement of the concrete 14 for secondary lining into the widened tunnel 12.

Next, the protector 20 is lifted above the vehicle passing portion 18 of the formwork 16, the formwork 16 is moved together with the protector 20 to the next process position, and the tunnel 1 where the protector 20 is moved is moved.
After installation in the vehicle traffic zone 24, casting of concrete 14, curing and curing of concrete 14, removal of the mold 16 and the like are performed continuously over the entire length of the widened tunnel 12.

Although a gap is formed between the protector 38 for the excavation part and the protective body 20, a dust collector (not shown) is mounted on the form 16 as in the prior art. Since dust and concrete debris generated at 36 and concrete debris generated at the time of concrete casting are collected, there is no effect on ordinary vehicles passing through this gap.

As described above, in the concrete casting method for widening work according to the present invention, the protective work 20 suspended from the formwork 16 is moved in the horizontal direction with respect to the formwork 16 so that the protective work 20 By expanding and contracting both lower edges,
Since the protector 20 is installed so as to correspond to the vehicle lane 24 of the tunnel 12 and is in close contact therewith, there is no need to install a protector (protector) over the entire length of the tunnel 12 as in the related art. The interior of the vehicle is not affected by dust, concrete debris generated by widening work, concrete debris generated by concrete casting, and the like, and the vehicle can safely pass through the inside of the protective work 20.

In this example, the protective work 20 is the formwork 1
6 is suspended movably in the horizontal direction, and the lower part on both sides is stretchable.
In the case where the second vehicle lane 24 is composed of only a straight portion over the entire length of the tunnel 12, it is not necessary to move the protective member 20 in the horizontal direction with respect to the formwork 16 and expand and contract the lower portions on both sides of the protective member 20. It is self-evident that each moving and expanding / contracting means and the hinge structure 30 can be omitted.

Even if the protection work 20 is not moved in the horizontal direction with respect to the formwork 16 or the lower portions on both sides of the protection work 20 are not expanded or contracted, a protection work (protector) is installed over the entire length of the tunnel as in the conventional case. No need to
It is obvious that workability can be improved.

In addition, in the case where the protective means 20 is not provided with the means for moving the protector 20 in the horizontal direction with respect to the formwork 16, the expansion and contraction means on both lower sides of the protective means 20, and the hinge structure 30, the structure becomes extremely simple and the manufacturing cost is reduced. It is self-evident that we can drastically reduce this.

The means for moving the protective worker 20 in the horizontal direction with respect to the formwork 16 is the telescopic cylinder 22, and the telescopic means at the lower portion on both sides of the protective worker 20 is provided by the telescopic jack 30. It is free to adopt means.

The protective worker 20 moves the mold 16 in the horizontal direction, but it is obvious that the protector 20 can also move in the vertical direction or move only in one of the horizontal direction and the vertical direction. is there.

The protective member 20 has a U-shape with an opening in the front-rear direction and below, and has a shape in which the bottom plate is omitted.
It is not necessary to open the lower part, and the shape is not limited to this shape.

The method and apparatus of the present invention are not particularly limited for use, such as a substantially semicircular tunnel, a circular tunnel, for example, an underwater tunnel and a sewer.

[0047]

According to the concrete casting method and apparatus for widening a tunnel according to the present invention, a protective work suspended in a vehicle traffic section below a formwork is installed in a vehicle traffic zone of a tunnel. After protecting the passing vehicle, concrete is cast between the formwork and the widened inner wall of the tunnel, so there is no need to install protective works in advance over the entire length of the tunnel as in the past, and this work load is drastically reduced. Thus, the construction period can be significantly reduced.

Further, the protective device can be moved in the horizontal direction and / or the vertical direction with respect to the formwork and installed along the vehicle traffic band of the tunnel, so that the protective structure can be extremely positioned at a predetermined portion of the vehicle traffic band. It can be easily installed, and the workability related to the installation of protective works can be improved.

Also, the lower parts on both sides of the protective work are made to be able to expand and contract,
By adhering the lower edges of both sides of the protective structure to the traffic lane of the tunnel, the inside of the protective structure may be affected by dust, concrete debris generated by widening work, and concrete debris generated by concrete casting. Not
Not only can the vehicle pass safely through the inside of the protective work, but also concrete casting work by widening work can be performed safely. Useful.

Further, by making the protective work bendable in the longitudinal direction, it is possible to easily correspond to the plane shape of the vehicle lane, for example, a curve, and to improve the compatibility with the vehicle lane. Can be.

[Brief description of the drawings]

FIG. 1 is a front view of a concrete placing device in widening work according to the present invention.

FIG. 2 is a side view of the same.

FIG. 3 is a side view showing the state of use.

FIG. 4 is a front view of a tunnel before widening work.

FIG. 5 is a front view of a tunnel in which widening work has been performed uniformly outward from the outer periphery of the tunnel.

FIG. 6 is a front view of a tunnel in which widening work is performed by eccentricity from the center of the tunnel.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 12 Tunnel 14 Concrete 16 Formwork 18 Vehicle traffic section 20 Protective work 24 Vehicle traffic zone 40 Tunnel inner wall surface

Claims (8)

[Claims] 1. A method for casting concrete (14) using a form (16) capable of securing a vehicle traffic section (18) below in widening work of a tunnel (12). A protective work (2) suspended along the entire length of the formwork (16) on the vehicle traffic section (18)
(0) is installed in the vehicle lane (24) of the tunnel (12) to protect the vehicles, then the formwork (16) and the widened inner wall of the tunnel
A method for placing concrete in tunnel widening work, comprising placing concrete (14) between the concrete and the (40). 2. The tunnel protector (20) is movable horizontally and / or vertically with respect to the formwork (16).
2. The concrete placing method in tunnel widening work according to claim 1, wherein the concrete placing method is installed along the vehicle lane (24). 3. The lower part on both sides of the protective work (20) is made to be telescopic,
Connect the lower edge of both sides of the protective work (20) to the vehicle lane (2) of the tunnel (12).
3. The method for placing concrete in tunnel widening work according to claim 1 or 2, wherein the concrete is placed in close contact with (4). 4. The protection device according to claim 1, wherein the protection work is made flexible in the longitudinal direction so as to improve the responsiveness of the tunnel to the traffic zone of the vehicle. 4. The method for placing concrete in tunnel widening work according to claim 2. 5. An apparatus for placing concrete (14) using a formwork (16) capable of securing a vehicle traffic section (18) below during widening work of a tunnel (12). In the vehicle traffic section (18), along the entire length of the formwork (16), a protective work (20) having an opening in the front-rear direction for protecting the passing vehicle is suspended, and the protective work ( 20) Tunnel (12) vehicle lane
(24) to protect the passing vehicles, and then cast concrete (14) between the formwork (16) and the widened tunnel inner wall surface (40). Concrete casting equipment. 6. The protective device (20) is movable horizontally or / and vertically with respect to the formwork (16), and the tunnel (1) is provided.
6. The concrete placing device according to claim 5, wherein the concrete placing device is installed along the vehicle lane (24). 7. The lower part on both sides of the protective work (20) is made to be able to expand and contract,
Connect the lower edge of both sides of the protective work (20) to the vehicle lane (2) of the tunnel (12).
7. The concrete placing device in tunnel widening work according to claim 5, wherein the concrete placing device is brought into close contact with (4). 8. The protection device according to claim 5, wherein the protective member is made freely bendable in the longitudinal direction so as to improve the responsiveness of the tunnel to the vehicle lane. The concrete placing device according to claim 6 or 7, wherein the concrete is placed in a tunnel widening work.