JP4069729B2 - Road tunnel floor slab formation method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for forming a floor slab for a road tunnel, and more particularly to a method for forming a floor slab when a road tunnel is constructed by a shield method.
[0002]
[Prior art]
When constructing a road tunnel, it is necessary to form a floor slab for enabling the vehicle to run inside the road tunnel, and this kind of floor slab is usually intended to be constructed as shown in FIG. A substantially flat floor slab portion 2 positioned below the center of the road tunnel 1 and extending so as to cross the cross section and both ends of the floor slab portion 2 are supported, and fixed to the side of the road tunnel 1. A pair of side wall portions 3 provided, and a middle column portion 4 that is fixed at the bottom of the road tunnel 1 and supports the center of the floor slab portion 2 from below are provided.
[0003]
By the way, a shield construction method is known as a kind of construction method for constructing a road tunnel having such a cross-sectional shape. When constructing a road tunnel by the shield construction method, it is not known whether or not it is disclosed in the literature, but at the construction site, the above-mentioned floor slab is generally formed of cast-in-place concrete.
[0004]
However, the conventional method for forming a floor slab for a road tunnel has the following problems.
[0005]
[Problems to be solved by the invention]
That is, when a floor slab having a floor slab part 2, a side wall part 3, and a middle pillar part 4 is constructed on-site, a process of assembling a mold, assembling a reinforcing bar, placing concrete, and curing is performed. The construction takes time and costs.
[0006]
Also, when the floor slab is installed on site, the height position of the sleepers where the rails on which the material transporting vehicle runs are provided to enable simultaneous construction with the excavation work involving material transport such as segments Has been set to be slightly above the center of the road tunnel 1 in consideration of the height of the concrete mold for placing concrete and workability such as leveling of concrete.
[0007]
In other words, when the floor slab was constructed on site, the floor slab was placed on the rough lower half of the road tunnel 1 and the material for excavation work was transported on the upper half. When the height is increased, the weight of the material and the transport vehicle becomes large, and there is a problem that the installation and removal becomes a work at a high place, which takes time and cost.
[0008]
The present invention has been made in view of such conventional problems, and the object of the present invention is to provide a method for forming a floor slab for a road tunnel that can reduce construction time and cost. is there.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, according to the present invention, when a road tunnel is constructed by a shield method in which segments are assembled in an annular shape on an excavation surface, a floor slab is directed from the entrance side to the face side of the road tunnel that is being constructed. The floor slab is located below the center of the road tunnel, and is a substantially flat floor slab portion that extends across a cross section of the road tunnel, and the floor A pair of side wall portions that support both ends of the plate portion, and are fixed to the side portion of the road tunnel, and a middle column portion that is fixed to the bottom portion of the road tunnel and supports the center of the floor slab portion from below. The floor slab is composed of a precast member that is formed in a predetermined shape in advance, and a rail on which the material transport vehicle necessary for excavation work can be run by opening a space where the floor slab can be constructed. At the bottom of the road tunnel To together, a guide rail capable of running the floor plate placement carriage laid on the outside of the rail, and the installation work of the floor plate by the floor plate placement carriage, the materials necessary to excavation work by the material handling vehicle It was made possible to proceed with transportation at the same time .
[0010]
According to the method for forming a floor slab for a road tunnel configured in this way, the floor slab is composed of a precast member that is previously formed in a predetermined shape. Construction time is shortened and construction efficiency is improved.
[0011]
In addition, the rails that can travel the material transport vehicle necessary for excavation work are laid at the bottom of the road tunnel with a space where the floor slab can be constructed, so a large support structure is not required and Removal is also easy.
[0012]
A pair of the rails can be provided on both sides of the center pillar portion where the construction is planned.
[0014]
The floor slab has the pair of side wall portions fixed to the side of the tunnel, and then the lower end of the middle column portion is erected on the bottom of the road tunnel, and then both ends are placed on the side wall portion. At the same time, the floor slab portion can be installed with the central portion in contact with the upper end of the middle column portion.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described in detail with reference to the accompanying drawings. 1 to 6 show an embodiment of a method for forming a floor slab of a road tunnel according to the present invention.
[0016]
The road tunnel 10 shown in the figure is maintained in a tunnel shape by excavating natural ground with a shield machine (not shown) and assembling segments in an annular shape on the excavated surface.
[0017]
When the road tunnel 10 is constructed by such a shield construction method, the floor slab 12 is sequentially formed from the entrance side of the constructed road tunnel 10 simultaneously with the excavation work of the shield machine on the face side. The
[0018]
In this embodiment, the floor slab 12 includes a floor slab portion 12a, a pair of side wall portions 12b, and a middle column portion 12c, as shown in detail in FIG. The floor slab portion 12a is formed in a substantially flat plate shape having a predetermined thickness. In the case of this embodiment, the floor slab portion 12a is located below the center of the tunnel 10 in the cross section of the road tunnel 10, and the tunnel 10 The cross section of the road tunnel 10 is formed to extend across the cross section of the road tunnel 10 in this form.
[0019]
The pair of side wall portions 12b are disposed so as to face the side surfaces of the road tunnel 10, and are formed in a substantially right triangle shape. On the hypotenuse of the right triangle of each side wall portion 12b, a curved portion whose curvature is in close contact with the inner surface of the road tunnel 10 is formed. This curved portion is fixed to the side portion of the road tunnel 10 and a floor slab is formed on the upper side. By placing both ends of the portion 12a, both ends of the floor slab portion 12a are supported and formed in this form over the total extension of the road tunnel 10.
[0020]
The middle column portion 12c is fixed at the bottom of the road tunnel 10 and supports the center of the floor slab portion 12a from below, and the middle column portion 12c extends along the axial direction of the road tunnel 10, Many are erected and arranged at a predetermined interval.
[0021]
The floor slab 12 including the floor slab portion 12a, the side wall portion 12b, and the middle column portion 12c is composed of a precast member that is previously formed in a predetermined shape and a predetermined length by factory production or the like. In the case of the present embodiment, the floor slab portion 12a and the side wall portion 12b are set to the same length, and the middle column portion 12c is a set of a plurality of pieces corresponding to this length.
[0022]
When the floor slab 12 is formed in the road tunnel 10, as shown in FIG. 1, a rail 16 that allows the material transporting vehicle 14 necessary for excavation work to be opened by opening a space where the floor slab 12 can be constructed. Is laid at the bottom of the road tunnel 10.
[0023]
In the case of the present embodiment, four rails 16 are arranged on the sleepers 18 at a predetermined interval so that two vehicles 14 can travel. In the central part of the sleeper 18, a dividing part 20 is provided in which the middle pillar part 12 c can be installed by removing it.
[0024]
In the case of the present embodiment, the floor slab 12 is formed by using a floor slab installation carriage 24 that runs on a guide rail 22 laid outside the rail 16. The floor slab installation carriage 24 has a gate-type carriage main body 24a provided with wheels that roll on the guide rails 22 at the lower end.
[0025]
A suspension balance 24d provided with a suspension fitting 24b for suspending the side wall portion 12b is installed on a side portion of the carriage main body 24a. A hoist 24c for suspending the floor slab portion 12a or the middle column portion 12c is provided on the upper side of the carriage main body 24a.
[0026]
When the floor slab 12 is formed in the road tunnel 10, first, as shown in FIGS. 1 and 2, the pair of side wall portions 12 b are attached to the hanging bracket 24 b of the floor slab installation carriage 24 and transported to the installation location. And fixed to the side of the road tunnel 10.
[0027]
In this case, as shown in FIG. 1, the positioning and fixing of the side wall portion 12 b can be easily performed by previously providing the locking metal fitting 26 of the side wall portion 12 b at a predetermined position of the segment of the road tunnel 10.
[0028]
When the installation of the side wall portion 12b at the predetermined position is finished, next, as shown in FIG. 3, the middle pillar portion 12c is attached to the hoist 24c, and this is erected on the bottom portion of the road tunnel 10.
[0029]
At this time, the divided portion 20 of the sleeper 18 is removed, and the lower end of the middle column portion 12c is fixed to the bottom of the road tunnel 10 by, for example, non-shrinkable concrete 28, whereby the middle column portion 12c is erected. Installed in the installed state.
[0030]
The vertical installation of the middle pillar portion 12c is performed at a predetermined interval along the tunnel axis direction. When this installation is completed, the floor slab portion is then placed on the hoist 24c as shown in FIG. 12a is attached, it lifts, both ends are mounted on the side wall part 12b, and this is installed so that the upper end of the center pillar part 12c may contact | abut to the lower surface of a center part.
[0031]
By the above steps, as shown in FIG. 5, the floor slab 12 having a predetermined length composed of the floor slab portion 12 a, the side wall portion 12 b, and the middle column portion 12 c is formed, and then the above-described steps are sequentially repeated, The floor slab 12 is extended to the face side.
[0032]
In addition, the floor slab portion 12a having both ends placed on the side wall portion 12b is integrated by forming a finished concrete layer covering the outer periphery of the side wall portion 12b, and finally has the same structure as shown in FIG. It becomes a state.
[0033]
Now, according to the road tunnel floor slab forming method configured as described above, the floor slab 12 is composed of a precast member formed in a predetermined shape in advance. As a result, the construction time on site is shortened and the construction efficiency is improved.
[0034]
In addition, in the case of the present embodiment, the material transport vehicle 14 that transports materials necessary for excavation work, for example, a segment, can travel without being affected by the work of forming the floor slab 12, so The plate forming operation can be carried out simultaneously, and the construction efficiency can be improved also from this point.
[0035]
In addition, since the rail 16 capable of traveling the material transporting vehicle 14 required for excavation work is laid at the bottom of the road tunnel 10 with a space where the floor slab 12 can be constructed, a large support structure is unnecessary. It is easy to install and remove.
[0036]
【The invention's effect】
As described above in detail, according to the method for forming a floor slab of a road tunnel according to the present invention, it is possible to shorten the construction time and the cost.
[Brief description of the drawings]
FIG. 1 is a cross-sectional explanatory view of an initial step of a method for forming a floor slab for a road tunnel according to the present invention.
FIG. 2 is an affirmative explanatory diagram subsequent to the process shown in FIG. 1;
FIG. 3 is an affirmative explanatory diagram subsequent to the step shown in FIG. 2;
4 is an affirmative explanatory diagram subsequent to the step shown in FIG. 3; FIG.
5 is an affirmative explanatory diagram subsequent to the process shown in FIG. 4; FIG.
FIG. 6 is a cross-sectional explanatory view of the floor slab formed in the road tunnel floor slab forming method according to the present invention.
FIG. 7 is an explanatory diagram of a floor slab formed in a road tunnel.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Road tunnel 12 Floor slab 12a Floor slab part 12b Side wall part 12c Middle pillar part 14 Material conveying vehicle 16 Rail 18 Sleeper 20 Dividing part 22 Guide rail 24 Floor slab installation cart

Claims (3)

When building a road tunnel by a shield method that assembles segments on the excavation surface in a ring shape, a method of forming a floor slab from the entrance side of the road tunnel in the middle of construction toward the face side,
The floor slab is located below the center of the road tunnel, and is a substantially flat floor slab portion extending so as to cross the cross section of the road tunnel;
A pair of side walls that support both ends of the floor slab and are fixed to the side of the road tunnel,
The lower end is fixed to the bottom of the road tunnel, and includes a middle column portion that supports the center of the floor slab portion from below,
The floor slab is composed of a precast member formed in a predetermined shape in advance,
Opening a space where the floor slab can be constructed, and laying a rail capable of traveling a material transport vehicle necessary for excavation work at the bottom of the road tunnel ,
Laying a guide rail capable of running a floor slab installation carriage on the outside of the rail,
A method for forming a floor slab in a road tunnel, wherein the floor slab installation work by the floor slab installation carriage and the transport of materials necessary for excavation work by the material transport vehicle can be simultaneously performed . 2. The method for forming a floor slab for a road tunnel according to claim 1, wherein a pair of the rails are provided on both sides of the center pillar portion where the construction is planned. The floor slab has the pair of side wall portions fixed to the side of the tunnel, and then the lower end of the middle column portion is erected on the bottom of the road tunnel, and then both ends are placed on the side wall portion. The floor slab forming method for a road tunnel according to claim 1 or 2, wherein the floor slab portion is installed with a central portion in contact with an upper end of the middle pillar portion.

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