JPH035598A - Cylindrical wall for covering boring hole - Google Patents

Abstract

PURPOSE:To facilitate construction by coupling L-shaped plates and flat plates for connecting main walls and intermediate column, the former plates being at an upper and lower end parts of the main wall and the latter plate being at both ends of the intermediate column. CONSTITUTION:This wall device is constituted of a main wall 12 in C-shape in cross section and a main wall 12 in reverse C-shape in cross section and an intermediate column 14. A pair of opposed plates 31 in L-shape in cross section are respectively provided at upper and lower end parts of the main walls 12 and coupled with flat plates 35 at the opposed ends of the intermediate column 14 and bolts 33 so as to assemble the walls 12 and the column 14. The working efficiency is therefore improved.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a lining cylindrical wall body assembled for lining a double excavation hole.

"Prior Art" In recent years, as a large-section shield construction method for constructing large-section tunnel structures such as railway tunnels, a method called a rectangular special section shield construction method has come into use. This construction method uses a shield excavator, which has a structure in which two cylindrical shield excavators are connected, to excavate the ground or the ground in a cross-sectional shape of two circles, with some of them overlapping. , RC segments are assembled on the inner surface of this excavated hole to form a cylindrical wall body, and a plurality of these cylindrical wall bodies are connected along the hole (primary lining), and the back side of the segment of this method lining. In other words, after filling the gap between the segment and the ground with the injection material, - concrete is rolled up on the inner surface of the method lining (secondary lining), supporting the ground and filling the predetermined inner space. It is said that it constitutes.

Conventionally, as a cylindrical wall constructed by the above-mentioned process, for example, the one shown in FIG. 4 is known. FIG. 4 shows an example of a conventional cylindrical wall. This cylindrical wall body 1-0 is used for an excavation hole in which circles are connected from side to side.
Specifically, arc-shaped segments 11 are connected to construct main walls 12, 12 having a C-shaped cross section and an inverted C-shaped cross section, and branches are formed between the upper and lower ends of these main walls. The middle pillars 14 are built between the upper and lower branch segments 13.13, and the eyeglass frame-shaped walls constructed in this way are successively connected in the axial direction of the excavated hole. It is what it is.

The segments 11, the branch segments 13, 13, and the middle pillar 14 that constitute the cylindrical wall body are connected by bolts and nuts, and each member has a bolt insertion hole 15a as a connection part by the bolts and nuts. The formed joint fittings 15, 15... are buried.

The branch segment 13 that connects the upper and lower parts of the left and right main walls 12, 12 is made of concrete and is integrally molded into a Y-shape in appearance. , whose end face is the center pillar 14
a base 813c with a square cross section connected to the base 13;
The basic structure consists of connecting arm portions 13a and 13b which branch out from c and whose end faces are connected to the main wall portions 12 and 12, respectively.

``Problems to be Solved by the Invention'' In constructing such a conventional cylindrical wall body 10, a step of bringing the center pillar 14 between the branch segments 13, 13 is required. Since the inside 114 is larger than the segment 11 constituting the cylindrical wall 10, there is a problem that assembling it takes time and effort.

Further, a branch segment 1.3.13 having a Y-shaped appearance is interposed between the segments II forming the main wall 12.12, and a middle pillar 14 is disposed between these branch segments 13.13.
Due to the structure in which the branch segment 13.13 is positioned, positional accuracy is required for the branch segment 13.
The segment 1 is attached to the connecting arms 13a and 13b! , 11
Due to the structure in which the middle pillar 14 is connected to the base 13c, the branch segment 13.13 itself must have good dimensional accuracy, which increases the cost. .

The present invention has been made in view of the above circumstances, and is a cylindrical wall body for lining an excavated hole that can be easily constructed on site, improves work efficiency, and reduces construction costs. The purpose is to provide

"Means for Solving the Problems" The cylindrical wall body for lining of the present invention is a cylindrical wall body for lining an excavated hole in which two excavated holes each having a circular cross section are formed so that a portion of the holes overlap each other. This lining tubular wall body has a main wall portion with a C-shaped cross section and a main wall portion with an inverted C-shaped cross section, each of which is composed of a plurality of circular arc plate-shaped segments, and a middle wall connecting the upper and lower ends thereof. At the upper and lower ends of these main walls, a pair of plates each having a cross-section shaped like a letter L are provided facing each other, and flat plates are provided at both ends of the middle column. The above object has been achieved by connecting the upper end and the lower end of the main wall by the central pillar by bolting the shaped plate and the flat plate of the central pillar.

1. In the lining tubular wall body having such a configuration, a main wall portion having a C-shaped cross section, a main wall portion having an inverted C-shaped cross section, and its upper end portion are composed of a plurality of arc plate-shaped segments. and a middle pillar connecting the lower ends of the main wall, a pair of plates each having a cross-section in the shape of a cross-section are provided facing each other at the upper and lower ends of these main walls, and a flat plate is provided at both ends of the middle pillar. Since the plate having an angular cross-section and the flat plate of the central column are connected by bolts, there is no need to provide a branch segment. In addition, the central pillar can be assembled to the main wall by bolting the flat plates provided at both ends to a pair of plates with an angular cross section provided oppositely at the upper and lower ends of the main wall, making construction easy. , the work efficiency can be improved and construction costs can be reduced.

"Example" Hereinafter, the cylindrical wall body for lining of the present invention will be described in detail with reference to the drawings.

Figures 1 to 3 are for showing an example of a cylindrical wall for lining according to the present invention, and in these figures, the same components as shown in Figure 4 are given the same reference numerals. to simplify the explanation.

FIG. 1 is a side view of a lining cylindrical wall body 20 of the present invention.

This lining cylindrical wall body 20 has a main wall portion 12.12 having a C-shaped cross section and an inverted C-shaped cross section by connecting arc-shaped segments 11.
and the upper end 21 and lower end 22 of these main walls.
A middle pillar 14 is built in between, and the eyeglass frame-shaped walls constructed in this way are successively connected in the axial direction of the excavated holes H, , H,.

The main wall portions 12, 12 are arc-shaped segments 11.1.
1... are formed by being bolted together in the axial and circumferential directions of the excavated holes H1 and H2. Embedded in the arc-shaped segment 11 are joint fittings 15, 15, . Figures 2 and 3 show the main wall portions 12, 12.
FIG. 2 is a side view of the main part of FIG. 1, and FIG. 3 is a perspective view thereof.

In FIGS. 2 and 3, the upper end 21 and lower end 22 of the main walls 12, 12 are connected to the segment 11.1, respectively.
A pair of plates 31.31 welded to the plate 31.31 with a square cross section are placed facing each other, and the bolt 33 is inserted through a washer 32.32 into a bolt insertion hole formed in the plate 31.31 with a square cross section. and are joined by a nut 34. moreover,
A flat plate 35 is welded to both ends of the center column 14 made of H-shaped steel, and the plates 31, 31 each having a cross section are inserted with a bolt 33 through a bolt insertion hole formed in each plate and then tightened with a nut 34. bolted together.

The segment 11, the plate 31 having a cross-section shape, the flat plate 35,
It is preferable that each member of the bolt 33 and the nut 34 be made of steel.

Furthermore, although only one center pillar I4 is shown in FIG. 3, it is also possible to similarly provide a plurality of center pillars between the upper end 21 and the lower end 22 of the main wall portion 12.

"Effects of the Invention" As explained above, the cylindrical wall body for lining of the present invention has a main wall part having a C-shaped cross section and a main wall part having an inverted C-shaped cross section, each of which is composed of a plurality of arc plate-like segments. It consists of a central pillar that connects the upper and lower ends of the main wall, and a pair of opposing plates each having an L-shaped cross section are provided at the upper and lower ends of these main walls.
Furthermore, since flat plates are provided at both ends of the center column, and the plate having the L-shaped cross section and the flat plate of the center column are connected with bolts, there is no need to provide a branch segment. In addition, the central pillar can be assembled to the main wall by bolting the flat plates provided at both ends to a pair of plates with an angular cross section provided oppositely at the upper and lower ends of the main wall, making construction easy. , the work efficiency can be improved and costs can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a side view of the cylindrical wall for lining of the present invention, and FIG.
The figure is a side view of the main part of FIG. 1, FIG. 3 is a perspective view of the same, and FIG. 4 is a side view of a conventional cylindrical wall for lining. DESCRIPTION OF SYMBOLS 11... Segment, 12... Main wall, 14... Middle column, 20... Cylindrical wall for lining, 21... Upper end part, 2
2...Lower end portion, 31...Cross-shaped plate, 33...
・Bolt, 34... Nut, 35... Flat plate, Hr
, Ht...Drilling hole.

Claims (1)

[Claims] A cylindrical wall for lining an excavated hole formed in such a way that two excavated holes each having a circular cross section partially overlap each other, the cylindrical wall for lining a plurality of It consists of a main wall part with a C-shaped cross section and a main wall part with an inverted C-shaped cross section, which are composed of circular arc plate-like segments, and a central column connecting the upper and lower ends of the main wall part, and the upper and lower ends of these main walls. each has a cross section L
A pair of letter-shaped plates are provided facing each other, and flat plates are provided at both ends of the middle pillar, and the upper end of the main wall is connected by bolting the L-shaped plate in cross section and the flat plate of the middle pillar. A cylindrical wall body for lining an excavated hole, characterized in that the lower end portion and the lower end portion are connected by a central pillar.