JPH09295313A - Manufacture of immersed tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for making an immersed tube (for a tunnel) advantageously by using many PCa (precast concrete) members. SOLUTION: A steel shell 5 with a groove-shaped cross section is assembled with panels with reinforcement embedded, after concrete for a bottom base being placed, a PCa mold form is set inside a side wall, and concrete for the side wall is placed. Next, a PCa floor plate 13 instead of a mold form is installed between the upper ends of both side walls, reinforced concrete for an upper floor plate is placed above the PCa floor plate 13. When a middle wall is installed, in parallel with placing concrete for the side wall, a PCa member 10 for the middle wall is installed in the middle part in the width direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a submerged box (box for submerged tunnel).

[0002]

2. Description of the Related Art Conventionally, in the manufacture of a submerged box, after forming an outer cover with a waterproof steel plate and arranging it on the inner side, using a sliding foam as an inner formwork, placing concrete on the peripheral wall, After forming the outer cover with a steel shell and arranging it inside, use the sliding form as the inner formwork to place the concrete on the peripheral wall, form the outer cover and the inner cover with the steel shell, and place it between them. There are various methods of placing concrete on the surrounding wall without streaking.

Each of these methods has merits and demerits, but when a sliding form is used as the inner form as in the method of Y, the cost becomes high and the construction period becomes long.

[0004]

In view of the above-mentioned circumstances, it is an object of the present invention to solve the problems of the present invention, and in view of the above-mentioned circumstances, PCa members (precast concrete members) are frequently used, and the submerged box is advantageously used. It is to provide a manufacturing method.

In order to solve the above problems, the first aspect of the present invention
In the method, after assembling a grooved steel shell with a panel to which a reinforcing bar is attached first, after placing the concrete of the bottom plate, setting the PCa formwork inside the side wall part, placing the concrete of the side wall, and then , PC as a formwork between the upper ends of both side walls
a) A floor slab is erected, and the upper floor slab concrete is placed by reinforcing the bar.

Further, in the second method of the present invention, a steel shell having a grooved cross section is assembled with a panel having a reinforcing bar in front, concrete for the bottom is placed, and then a PCa form is set inside the side wall. While placing concrete on the side wall,
A PCa member for the inner wall is installed at the center in the width direction, and then
A PCa floor slab as a formwork is erected between the upper ends of both side walls, and the upper floor slab concrete is placed by arranging the reinforcement above it.

In the second method, the central portion in the width direction is
Install the left and right PCa members for the inner wall at appropriate intervals,
In some cases, a space used for wiring or piping is formed.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The first and second methods of the present invention differ depending on whether or not an intermediate wall is formed in the central portion in the width direction of a submerged box.
Other points are the same.

An embodiment of the second method of the present invention for forming an inner wall in the central portion in the width direction will be described with reference to the drawings (FIGS. 1 to 10). First, a panel 1 for a steel shell bottom plate and a steel shell side wall. Panels 2 and 2 for use are arranged on the floor surface of the dry dock for manufacturing a submerged box, and reinforcing bars 3 and 4 are attached to them to prepare for assembling a steel shell (see FIGS. 1 and 2).

Then, a steel shell 5 having a groove-shaped cross section is assembled from the panel 1 and the panels 2 and 2 (see FIG. 3), and the concrete of the bottom board is placed on the panel 1 to form the bottom board 6 of the submerged box. (See FIG. 4) Then, the PCa molds 8 and 8 supported by the supports 7 and 7 are installed inside the panels 2 and 2 (refer to FIG. 5), and between the panel 2 and the PCa molds 8. Concrete is poured to form the side walls 9, 9 of the submerged box (see FIG. 6).

In parallel with the formation of the side walls 9 and 9 described above, PCa for the inner wall is formed in the center portion in the width direction (the middle portion between the side walls 9 and 9).
The members are installed, but in the case of the figure, a pair of PCa members 1
0 and 10 are installed at intervals, and a space 11 that can be used for wiring, piping, etc. is formed between them.

As shown in FIG. 2, an anchor metal fitting 12 is attached in advance to the center of the panel 1 in the width direction, and when the PCa member 10 is installed, the anchor metal fitting 12 is used to make the PCa member. It is preferable to fix the lower end of 10 to the bottom plate 6.

As described above, the side walls 9 and 9 are formed,
And, after installing the PCa members 10 and 10, the side walls 9 and 9
A PCa floor slab 13 that replaces the formwork is installed between the upper ends of the slabs (see FIG. 8), and the reinforcing bars 14 of the upper floor slab are laid above it (see FIG. 9). The upper floor slab 15 of the box is formed (see FIG. 10).

While one embodiment of the second method of the present invention has been described above with reference to the drawings, the first method of the present invention is
Only the difference that the middle wall is not formed in the widthwise central part,
Since the other points are the same as the second method, the detailed description thereof will be omitted.

[0015]

According to the first and second methods of the present invention, both the PCa member and the submerged box of the steel frame reinforced concrete structure composed of the steel shell and the reinforced concrete can be easily used without using the sliding foam. Since it can be manufactured, it is very advantageous in terms of cost and construction period.

In the second method of the present invention, in addition, since the inner wall can be easily formed at the central portion in the width direction, there is an advantage that it can be advantageously applied when the width of the burial box is large. .

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a state where a panel for steel shell is prepared in an embodiment of a second method of the present invention.

FIG. 2 is a sectional view showing a state in which a reinforcing bar is attached to a steel shell panel.

FIG. 3 is likewise a sectional view showing a state in which a steel shell having a grooved cross section is assembled.

FIG. 4 is a cross-sectional view showing a state in which concrete on the bottom plate is placed.

FIG. 5 is a sectional view showing a state in which a PCa form for the side wall is installed in the same manner.

FIG. 6 is a sectional view showing a state in which concrete on the side wall is placed.

FIG. 7 is a sectional view showing a state in which a PCa member for an inner wall is installed, similarly.

FIG. 8 is likewise a sectional view showing a state in which a PCa floor slab is installed.

FIG. 9 is a sectional view showing a state in which the reinforcing bars of the upper deck are also arranged.

FIG. 10 is a sectional view showing a state in which concrete of the upper floor slab is also placed.

[Explanation of symbols]

1: Panel, 2: Panel, 3: Reinforcing bar, 4: Reinforcing bar, 5: Steel shell, 6: Bottom plate, 7: Support, 8: PCa form, 9: Side wall, 10: PCa member, 11: Space, 12: Anchor metal fittings, 13: PCa floor slab, 14: rebar, 15: upper floor slab.

Claims (3)

[Claims] 1. A steel shell having a grooved cross section is assembled with a panel having a reinforcing bar in front, concrete for the bottom is placed, and then a PCa form is set inside the side wall to pour concrete for the side wall. Next, P as a formwork between the upper ends of both side walls
A method for manufacturing a submerged box, which comprises constructing a Ca floor slab, and arranging a bar above the concrete floor and placing concrete for the upper floor slab. 2. Assembling a steel shell having a grooved cross section with a panel to which a reinforcing bar is attached in advance, placing concrete on the bottom plate, setting a PCa formwork inside the side wall, and placing concrete on the side wall. , PCa for middle wall in the widthwise central part
A method for producing a submerged box, comprising: installing a member, then installing a PCa floor slab instead of a formwork between the upper ends of both side walls, and placing concrete on the top floor slab by arranging it above the PCa floor slab. 3. Left and right PCa for the inner wall at the center in the width direction
The method for manufacturing a submerged box according to claim 2, wherein members are installed at appropriate intervals to form a space used for wiring, piping and the like.