JPH0325191A - Lining cylindrical wall for excavated hole - Google Patents

Abstract

PURPOSE:To promote work efficiency by connecting the upper branched section and the lower branched section segments for joining respectively between the upper end sections and between the lower end sections of a main wall having a C shaped section and a main wall having a reverse C shaped section by a truss shaped column. CONSTITUTION:Circular arc slab shaped segments 11 are coupled to construct main walls respectively having a C shaped section and a reverse C shaped section. The upper/the lower branched section segments 13a and 13b are respectively joined between the upper end sections and between the lower end sections of each of the main walls, and two circles are so constructed that parts of them are overlapped each other. A column 14 is built up to the upper branched section segment 13A and the lower branched segment 13B of a double circles type wall in the shape of a truss, and it is subsequently connected in the direction of axes of excavated holes H1 and H2. According to the constitution, execution can be easily carried out at the site of the work, and work efficiency can be promoted.

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, a method called a double circular special section shield method has been used as a large cross section shield method for constructing large cross section tunnel structures such as railway tunnels. This construction uses a shield excavator with a structure in which two cylindrical shield excavators are connected. The ground is excavated, RC segments are assembled on the inner surface of the excavated hole to form a cylindrical wall, and a plurality of cylindrical walls are connected along the hole (primary lining). After filling the back of the segments, that is, the gap between the segment and the ground, with a pouring material, the inner surface of the primary lining is covered with concrete (secondary lining), which supports the ground and holds it in place. It is said that it constitutes the inner space of .

Conventionally, as a lining cylindrical wall constructed by the above process,
For example, the one shown in FIG. 8 is known. FIG. 8 shows an example of a conventional cylindrical wall for lining. This lining cylindrical wall body 10 is used for an excavation hole in the form of a series of circles on the left and right.
The earth wall part 12.1 has a C-shaped cross section and an inverted C-shaped cross section by connecting the
2, connect the branch segments l 3, + 3 between the upper and lower ends of these main walls, and erect the middle pillar l4 between the branch segments 13 and 13 located above and below, and The eyeglass frame-shaped walls constructed using the above method are successively connected in the axial direction of the excavated hole.

The segments 1l1, the branch segments 13, 13, and the middle pillar 14, which constitute the cylindrical wall, are connected by bolts and nuts, and bolt insertion holes 15a are formed in each of the above-mentioned members as connection parts by bolts and nuts. The joint fittings 1 5.1 5... are buried.

The branch segment 1 3.13 that connects the upper and lower ends of the left and right main walls 12 and 12 is made of concrete that is integrally molded into a Y-shaped appearance. Specifically, the branch segment 13 includes a base 13c having a rectangular cross section whose end face is connected to the center pillar 14, and a base 13c that branches from the base 13c and whose end faces are connected to the main wall 12.12. Connected arms 13a
, 13b.

"Problems to be Solved by the Invention" In such a conventional lining cylindrical wall body 10, the middle pillar 14 is built between the branch segments l3.13, and the cross section is C-shaped. and soil wall section 1 with an inverted C-shaped cross section 2.1
The middle pillar 14 has a structure that supports 2, and the middle pillar 14 has a high strength and rigidity, and is larger than the segment 11 that constitutes the lining cylindrical wall 10. Moreover, since the number of middle pillars 14 used is also increasing, the cost is high.

And in its construction, bifurcation segment 13.1
This requires a step of building the middle pillar l4 between the segments 1 and 3, but the middle pillar I4
Since it is larger than L, there is a problem in that it takes time and effort to assemble it.

In addition, these middle pillars are placed at the boundary between drilled hole HI and drilled hole H2.
4 are installed one after another at a certain interval in the axial direction of the excavation 6 H,,H,, and because they are medium-sized or large-sized, and the number of them used is increasing. In addition, the gap between the excavated hole H1 and the excavated hole H formed by this constant interval becomes narrower, and the gap between the excavated hole H. ,H! There are problems in that the efficiency of ventilation inside the excavation hole is poor, and it is difficult to move workers and transfer equipment between the excavation holes H and Ht.

The present invention has been made in view of the above-mentioned circumstances, and it is easy to construct on-site, improves work efficiency, and is low in cost. To provide a cylindrical wall body for lining an excavated hole, which has good performance and allows easy movement of workers and equipment between the excavated holes H1 and H. .

"Means for Solving the Problems" The cylindrical wall for lining of the present invention is a cylindrical wall for lining an excavated hole in which two excavated holes each having a circular cross section are formed so that the holes overlap each other. This tubular wall for lining has a C-shaped cross-sectional earth wall section and an inverted C-shaped cross-sectional main wall section composed of a plurality of arc plate-shaped segments, and a section between the upper ends of these main walls and An upper branch segment and a lower branch segment that respectively connect the lower ends are sequentially connected in the axial direction of the excavation hole, and the upper branch segment and the lower branch segment are further connected by a truss-shaped center column. The above object has been achieved by the following characteristics.

"Function" In the lining cylindrical wall body having such a configuration, the upper branch segment and the lower branch segment are connected by the truss-shaped central column, so that structurally,
The strength and rigidity of the center column are improved, and the number of center columns used can be reduced.

It is also possible to make the middle pillar even thinner.

Therefore, the work of assembling the middle pillar to the upper branch segment and the lower branch segment is easy, which not only improves work efficiency but also reduces costs. Furthermore, since the gap between the left and right excavated holes is widened, ventilation in the left and right excavated holes is efficient, and it is also possible to easily move workers and equipment between the left and right excavated holes.

"Example 1" 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 show the first part of the cylindrical wall body for lining of the present invention.
These figures are for illustrating an embodiment, and in these figures, the same components as shown in FIG. 8 are designated by the same reference numerals to simplify the explanation thereof.

FIG. 1 is a cross-sectional view of the lining cylindrical wall body 20 of the present invention,
FIG. 2 is a diagram showing the main part of FIG. 1, and FIG. 3 is a plan view of FIG.

In FIG. 1, the lining cylindrical wall 20 has a circular arc-shaped segment 1! are connected to construct main walls 1 2, 1 2 (not shown) having a C-shaped cross section and an inverted C-shaped cross section, and upper branch parts are formed between the upper and lower ends of these main walls, respectively. The upper branch segment 13A and the lower branch part of a double-circular wall body are formed by joining the segment 13A and the lower branch segment 13B so that the two circles constructed in this manner overlap each other. Assemble the middle section 14 to the segment 13B in a truss shape, and drill hole H+.
, Hz are sequentially connected in the axial direction.

Then, as shown in FIG. 8, the main wall portions 12, 1
2 is an arc-shaped segment 1 1.1 1... is the drilled hole H. ,H. are bolted together in the axial and circumferential directions. Embedded in the arc-shaped segment l1 are joint fittings 15, 15, . Further, the upper branch segment 13A. 13A・
... and lower branch segment 13B, 13B...
are also drilled holes H r by bolts and nuts, respectively.
They are sequentially connected in the axial direction of Ht.

As shown in Figure 1, upper branch segment + 3A
．． 13A... are provided with every other joint member 22 having a bolt insertion hole formed therein. Further, the lower branch segments 13B, 13B, . The joint members 22 provided in I3A... and the excavated holes H, , H, are arranged at every other interval so as to be arranged in a staggered manner in the axial direction.

Bolt insertion holes are formed at both ends of the middle pillar 14, respectively. As shown in FIGS. 2 and 3, the bolt insertion holes formed at both ends of the center pillar 14, 14 and the bolt insertion holes formed in the joint material 22 are overlapped, and these are overlapped. A bolt 31 having a threaded portion 30 is passed through the insertion hole and fixed with a nut 32.

Thereby, the middle pillar 14.14 is connected to the branch segment +3A, 13A... and the lower branch segment 13.
B, 13B... are assembled in a truss shape.

"Example 2" FIG. 4 is a diagram showing a second embodiment of the present invention.

In FIG. 4, the lining cylindrical wall body 40 is the first
As in the embodiment, main walls 1 2 , 1 2 (not shown) each having a C-shaped cross section and an inverted C-shaped cross section are constructed by connecting circular arc plate-shaped segments l1, and these main walls A double circle formed by joining the upper branch segment 13A and the lower branch segment +313 between the upper ends and between the lower ends, respectively, so that the two circles constructed in this way partially overlap each other. In the upper branch segment l3A and lower branch segment 13B of the wall of the middle column l4
are assembled into a truss shape, and the excavated hole H. He is connected sequentially in the axial direction.

Then, as shown in FIG. 8, the main wall portion 12''2
is the arc-shaped segment l1 11... is the drilling hole H
r. It is formed by being bolted together in the axial and circumferential directions of Ht. Arc-shaped segments! Joint fittings 15, 15, . . ., each having a bolt insertion hole 15a, are embedded in the bolt/nut connection portion.

Furthermore, the upper branch segment +3Aj3A...
And the lower branch segments 13B, 13B... are also drilled through holes H + and H by bolts and nuts, respectively.
They are sequentially connected in the axial direction of t.

As shown in FIG. 4, upper branch segment 13A.
Each of l3A... is provided with a joint member 22 in which a bolt insertion hole is formed. Further, the lower branch segments 13B, 13B, . . . are also provided with joint members 22 each having a bolt insertion hole formed therein. Bolt insertion holes are formed at both ends of the center column. As shown in FIGS. 2 and 3, this middle pillar 14.
14 and the bolt insertion holes formed in the joint material 22 are overlapped, and the bolts 3K formed with the Nejiro 30 are inserted into these overlapped insertion holes. It is fixed with a nut 32. Thereby, the middle pillars 14, 14... are assembled in a double truss shape with respect to the upper branch segments 13A, 13A... and the lower branch segments 13B, 13B.

In this way, by doubly assembling the truss-shaped middle columns 14, +4... to the upper branch segments 13A, 13A... and the lower branch segments 13B, 13B, extremely large strength and rigidity can be achieved. Pillar 14.14
...can be held.

"Embodiment 3" FIGS. 5 and 6 are diagrams showing a third embodiment of the present invention.

In FIG. 5, the lining cylindrical wall body 50 includes the upper branch segment 13A and the lower branch segment 13B.
As shown in FIG. 6, a channel steel 51 is welded to each of the grooves.

As shown in FIG. 6, bolt insertion holes 52a and 52b are formed in the groove 1151.

Further, bolt insertion holes are formed at both ends of the middle pillar 14, respectively.

As shown in FIG.
Bolt insertion hole 52a formed in l51. 52b and insert the bolt 3 into these overlapping insertion holes.
1 (not shown) and fixed with a nut 32 (not shown), the middle sections 14, 14... are connected to the upper branch segments 13A, 13A... and the lower branch segment}13B. , 13B..., groove jlj
It is assembled into a truss shape via ll51.

As mentioned above, by passing through the channel steel 51 in which the bolt insertion holes 52a and 52b are formed, the middle pillars 14, 14,
The assembly work of ... becomes easy.

"Effects of the Invention" As explained above, the cylindrical wall body for lining of the present invention is a cylindrical wall body for lining an excavated hole formed in such a manner that two excavated holes each having a circular cross section partially overlap each other. This tubular wall for lining has a C-shaped main wall section and an inverted C-shaped main wall section, each of which is composed of a plurality of arc plate-shaped segments, and An upper branch segment and a lower branch segment that connect the upper ends and the lower ends, respectively, are sequentially connected in the axial direction of the drilled hole, and the upper branch segment and the lower branch segment are arranged in a truss-shaped medium. By being connected by pillars, it is easy to construct on-site, improving work efficiency, low cost, and it is easy to drill holes.
1. , Ht has good ventilation efficiency, and it is also possible to easily move workers and equipment between the excavation hole H1 and the excavation hole 1'lt.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a tubular wall for lining according to the first embodiment of the present invention, FIG. 2 is a view showing the main part of FIG. 1, and FIG.
FIG. 4 is a sectional view of a tubular wall for lining according to the second embodiment of the present invention, and FIG. 5 is a plan view of the lining according to the third embodiment of the present invention. A cross-sectional view of a cylindrical wall for construction. Figure 6 is a diagram showing the state of connection between the channel steel in Figure 5 and the upper (lower) branch segment. Figure 7 is a diagram showing the connection state between the channel steel in Figure 6 and the middle branch segment. FIG. 8 is a side view of a conventional cylindrical wall for lining. l1...Circular plate-like segment, I2...Main wall part, l
3A... Upper branch segment, 13B... Lower branch segment, l4... Middle pillar, 20, 40.50.
... Cylindrical wall for lining, H. , H t+...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 A main wall portion having a C-shaped cross section and a main wall portion having an inverted C-shaped cross section, which are composed of arc plate-like segments, and an upper branch segment and a lower branch that connect the upper and lower ends of these main walls, respectively. for lining an excavated hole, characterized in that the upper branch segment and the lower branch segment are interconnected by a truss-shaped center pillar. Cylindrical wall.