JP3795148B2 - Construction method of cylindrical wall body by segment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for constructing a cylindrical wall body by a segment that forms a cylindrical wall body in the axial direction of an excavation hole by connecting a plurality of them together.
[0002]
[Prior art]
As a method of constructing a tunnel, a so-called shield method is generally used in which a circular wall segment is constructed by assembling arc-shaped segments on the inner surface side of a drilling hole.
As a segment used for this shield method, for example, concrete or steel is known.
[0003]
[Problems to be solved by the invention]
By the way, in recent years, as a segment used for a tunnel or the like, a segment having a simplified structure while ensuring sufficient strength is required for the purpose of cost reduction, and even if the structure is simplified. In addition, it is required to have joint portions that can be joined with high accuracy without any gaps.
[0004]
The present invention has been made in view of the above circumstances, and provides a method for constructing a cylindrical wall body using segments that are sufficiently strong and have a simple structure and can be connected to each other with high accuracy. The purpose is that.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, a method for constructing a cylindrical wall body using segments according to claim 1 includes a skin plate provided on an outer peripheral side, a main girder plate provided on both sides of the skin plate, and the skin. Precast concrete ribs made of precast concrete joint plates preformed on both ends of the plate, and formed in a box shape with an inner surface opened, and precast concrete ribs formed between the main girders The segments constituted by the above are connected in the circumferential direction and assembled to construct a cylindrical wall, and then concrete is placed inside the segments .
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of a method for constructing a cylindrical wall body using segments according to the present invention will be described with reference to the drawings. In FIG. 1, the code | symbol 1 is the arc-shaped plate-shaped segment which comprises a cylindrical wall body. These segments 1 are synthetic segments composed of a frame body 2 and concrete 3 placed inside the frame body 2.
The frame 2 includes a skin plate 4 provided on the outer peripheral side, a main girder plate 5 provided on a side portion of the skin plate 4, and a joint plate 6 provided on an end portion of the skin plate 4. The skin plate 4 and the main girder plate 5 are each formed from a steel plate. Further, as the joint plate 6, a precast concrete plate material formed in advance is used, and is attached between the main girder plates 5. The joint plate 6 can be attached to the main girder plate 5 and the skin plate 4 by, for example, adhesive fixing with an adhesive, fitting into a recess made of the main girder plate 5 and the skin plate 4 or striking. There is a thing by. Alternatively, an insert may be embedded in the joint plate 6 in advance and bolted using this insert.
[0007]
The frame 2 is provided with a plurality of ribs 7 made of steel plates between the main beam plates 5. As shown in FIG. 2, the ribs 7 are disposed on the inner peripheral side of the main beam plate 5, and therefore, a gap S is formed between the ribs 7 and the skin plate 4. And as shown in FIG. 3, the concrete 3 is laid in the frame 2 containing this clearance gap S part.
Note that an adhesive material is applied to the inner surface of the frame body 2 so as to be surely integrated with the concrete 3 placed in the frame body 2.
[0008]
Further, the main girder plate 5 has projections 11 and holes 12 formed on the surface thereof. When the projections 11 and the holes 12 of the segments 1 to be joined in the axial direction are fitted, these segments are fitted. 1 is positioned and displacement in the circumferential direction is restricted.
Thus, according to the said segment 1 , since the board material made from precast previously shape | molded with concrete was used as the joint board 6 which comprises the frame 2, For example, compared with the case where this joint board 6 is formed from a steel plate. Thus, there is no influence of deformation due to welding or distortion due to material tolerances, and therefore, the segments 1 can be reliably connected in the circumferential direction without causing a gap or the like.
[0009]
In addition, since the concrete 3 is placed in the gap S formed between the rib 7 of the frame 2 and the skin plate 4, it is possible to reliably integrate the placed concrete 3 with the frame 2. Thus, the strength of the segment 1 can be greatly improved by the integrated concrete 3, and therefore, the amount of the concrete 3 placed in the frame 2 can be reduced to reduce the cost. Furthermore, the inner surface side of the integrated concrete 3 can be reliably supported by the ribs 7, and the concrete 3 can be reliably prevented from falling off. Moreover, the strength can be further improved by placing the concrete 3 on the portion of the frame 2 where the ribs 7 are disposed. In addition, what is necessary is just to adjust the placement amount of the concrete 3 to this part according to the intensity | strength of a rock mass.
[0010]
In addition, since the flow of the concrete 3 is not stopped by the rib 7 when the concrete 3 is placed, the concrete 3 is compared with the case where the concrete 3 is placed in a place completely partitioned by the rib. The placing work can be easily performed.
[0011]
In addition, when it is set as the structure which embeds an insert in the joint board 6 and fixes the joint board 6 using this insert, what has a thread part is used as the said pin 11 provided in the main girder board 5, and this pin is used as the main. If the girder plate 5 is screwed and attached to the insert of the joint plate 6, the joint plate 6 can be fixed together with the pin 11, and the structure can be simplified.
[0012]
FIG. 4 shows a segment 1 according to an embodiment of the present invention. This segment 1 is a rib made of a precast concrete plate material instead of the rib 7 made of a steel plate between the main beam plates 5. 21 is provided, and a rib 21 made of precast concrete is a reaction structure of jack thrust.
[0013]
In addition, as a construction method of the cylindrical wall body by the segment 1, first, the segment 1 is assembled to construct the cylindrical wall body, and then the filling concrete 3 is placed in the segment 1 constituting the cylindrical wall body. For example, it is placed by spraying.
That is, according to such a construction procedure, the concrete 3 is placed after the deformation of the skin plate 4 due to the natural ground load. Is prevented.
[0014]
【The invention's effect】
As described above, according to the method for constructing a cylindrical wall body using the segments of the present invention, the following effects can be obtained.
By constructing the segment into a cylindrical wall and then placing the concrete in the frame of the segment, the concrete will be placed after the skin plate is deformed by the natural ground load. Peeling of the stuffed concrete from the skin plate due to deformation is prevented.
In addition, since the concrete is placed in the frame to ensure the strength, the thickness of the frame components can be reduced to reduce the cost, and they are connected to each other in the circumferential direction. The joint plate is made of a precast concrete plate that has been deformed in advance. Therefore, each segment can be reliably connected in the circumferential direction without a gap.
[Brief description of the drawings]
FIG. 1 is a perspective view illustrating a segment according to an embodiment of the present invention as viewed from the inner surface side of a cylindrical wall body.
FIG. 2 is a cross-sectional view of a frame for explaining the configuration and structure of a segment according to an embodiment of the present invention.
FIG. 3 is a sectional view of the segment for explaining the configuration and structure of the segment according to the embodiment of the present invention.
FIG. 4 is a perspective view of a frame for explaining another configuration and structure of a segment according to an embodiment of the present invention.
[Explanation of symbols]
1 Segment 2 Frame 3 Concrete 4 Skin Plate 5 Main Girder Plate 6 Joint Plate 21 Rib

Claims (1)

A box having a skin plate provided on the outer peripheral side, a main girder plate provided on both sides of the skin plate, and a joint plate made of precast concrete formed in advance on both ends of the skin plate, the inner side being open A frame formed in a mold;
A precast concrete rib formed in advance between the main beam plates;
By assembling together the segments composed of
Thereafter, concrete is placed inside the segment, and the method of constructing the cylindrical wall body by the segment is characterized.

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