JP2683643B2 - Tubular wall for excavation hole lining - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tubular wall for lining, which is assembled for lining a double excavation hole.

[Background Art] In recent years, as a large-section shield method for constructing a large-section tunnel structure such as a railway tunnel, a so-called double-circle special-section shield method has been used. This method uses a shield excavator having a structure in which two cylindrical shield excavators are connected to each other, and excavates the ground or the ground into a cross-sectional shape in which two circles are partly overlapped and continuous. , The RC segment is assembled on the inner surface of the excavated hole to form the lining tubular wall body, and a plurality of lining tubular wall bodies are connected along the hole (primary lining). After filling the back of the lining segment, that is, the filling material that fills the void between the segment and the ground, concrete is rolled up on the inner surface of the primary lining (secondary lining) to support the ground by them. To form a predetermined inner space.

6 and 7 show an example of a conventional tubular wall for lining.

FIG. 6 is a side view of the conventional tubular wall body 10 for lining. The lining tubular wall body 10 is used for an excavation hole having a shape in which circles are lined up on the left and right.
11 and the key segment 11a are connected to construct main wall portions 12, 12 having a C-shaped cross section and an inverted C-shaped cross section. Here, reference numeral 11a
Indicates a key segment, and this key segment 11
As shown in FIG. 7, a has side faces 11b, 11b formed in a tapered shape, and is assembled between the arcuate plate-shaped segments 11, 11.

The upper branch segment 13 is joined between the upper ends of the main wall portions 12 and 12, the lower branch segment 14 is connected between the lower ends, and the upper branch segment 13 and the lower branch segment 14 are located above and below. A branch portion support body 15 is built in, and the eyeglass frame-shaped wall bodies thus constructed are sequentially connected in the axial direction of the excavation hole.

The segment 11, the key segment 11a, the upper branch portion segment 13, the lower branch portion segment 14, and the branch portion support body 15 that constitute the lining tubular wall body 10 are connected by bolts and nuts, and each of the above. .. in which a bolt insertion hole 16a is formed are embedded in the member as a connecting portion by bolts and nuts.

The upper branch portion segment 13 that connects the left and right main wall portions 12, 12 is made of concrete and integrally formed in a Y-shaped appearance. The concrete configuration of the upper branch portion segment 13 is as follows. , Its end face is the branch support
The basic structure is composed of a base portion 13c having a rectangular cross section that is connected to the base portion 15, and connection arm portions 13a and 13b that branch from the base portion 13c and have their respective end faces connected to the main wall portions 12 and 12.

On the other hand, the lower branch segment 14 is basically made of concrete and has an appearance Y, similar to the upper branch segment 13.
What is integrally formed in the shape of a letter is used, and its specific configuration is, in the lower branch segment 14, a base portion 14c having a rectangular cross section whose end face is connected to the branch portion support body 15,
The end faces of the main wall portions 12 and 12 are branched from this base portion 14c.
It has a basic structure composed of connecting arm portions 14a and 14b connected to. However, the lower branch segment 14 is
The two connecting arm portions 14a, 14b are both formed to be longer than the connecting arm portions 13a, 13b of the upper branch portion segment 13, and two large and small upper branch portion segments 13 and lower branch portion segments 13 are formed.
By alternately using 14 in the axial direction of the lining tubular wall body 10, arc-shaped segment 11 and upper branch segment 13
Also, it is taken into consideration that the lower branch segments 14 are arranged in a zigzag pattern in the axial direction of the lining tubular wall body 10.

Further, in the above example has described the case where each wellbore H ₁ as a twin type, H ₂ was arranged horizontally, are the same when they are arranged vertically, wellbore H _1, When H ₂ is arranged horizontally, the branch portion support 15 functions as a center pillar or a middle wall, and when arranged vertically, it functions as a floor slab.

[Problems to be Solved by the Invention] In such a conventional tubular wall body 10 for lining, an exterior Y-shaped upper branch is provided between the segments 11, 11 forming the main wall portions 12, 12. A lower segment 13 and a lower branch segment 14, and the upper and lower branch segments 1
Due to the structure in which the branch support 15 is located between the three and four, the positional accuracy of the upper and lower branch segments 13 and 14 is required, and the key segment 11a is required.

Moreover, the upper and lower branch segments 13 and 14 include the connecting arms 13a and 13b and the segments 11 and 11 and the base 1 on the 14a and 14b.
Due to the structure in which the branch portion support body 15 is connected to the 3c and 14c, the dimensional accuracy of the upper and lower branch portion segments 13 and 14 themselves must be good, and the cost is high.

The present invention has been made in view of the above circumstances, and is easy to perform on-site construction and can reduce construction cost.
A type of branch segment that allows the arc-shaped segment, the upper branch segment, and the lower branch segment to be staggered in the axial direction of the lining tubular wall body. Intended to provide the body.

"Means for Solving the Problem" The tubular wall for lining of a lining of the present invention is a tubular wall for lining an excavation hole, in which two excavation holes each having a circular cross section are formed so as to partially overlap each other. The lining tubular wall body joins the main wall portion having a C-shaped cross section and the main wall portion having an inverted C-shaped cross section, which are composed of a plurality of arcuate plate-shaped segments, to the end portions of these main wall portions. It comprises a branch portion segment and a branch portion support body connecting the branch portion segments, and the branch portion segment has an end face connected to the branch portion support body, a C-shaped main wall portion and an inverted C-shaped cross section. -Shaped main wall portion and side surfaces connected to each other, and each of the side surfaces is formed in a tapered shape, and in particular, on the side surface of the branching segment, arcuate printing plates having different lengths, respectively. Achieving the above objective by alternately joining segments did.

"Operation" In the lining tubular wall body having such a configuration, the branch surface segment has an end face connected to the branch portion support body, a main wall portion having a C-shaped cross section, and a main wall portion having an inverted C-shaped cross section. The branch segment also functions as a key segment because it has a side surface connected to the wall and each side surface is formed in a tapered shape. Therefore, the branch segment can be easily attached to the main wall, and the work efficiency can be improved, so that the construction cost can be reduced.

Further, when arcuate segments having different lengths are alternately provided on the side surfaces of these branch segments, one kind of branch segment covers the arcuate segment, the upper branch segment and the lower branch segment. It can be arranged in a zigzag manner in the axial direction of the engineering tubular wall.

[Examples] Hereinafter, examples of the present invention will be described in detail with reference to the drawings.

1 to 5 are views showing an embodiment of the present invention. As the segment, a concrete segment and a steel segment are provided. Here, the steel segment will be described as an example. It should be noted that the same reference numerals are given to the portions having the same configurations as those shown in FIG.

FIG. 1 is a side view of a lining tubular wall body 20 of the present invention.
The lining tubular wall body 20 is constructed by connecting arcuate plate-shaped segments 11 to construct main wall portions 12 having a C-shaped cross section and an inverted C-shaped cross section, and upper and lower end portions of these main wall portions. The branch segment segments 13A and 13A (Fig. 2) are joined to 21,21 and the branch segment support 15 is further connected between these branch segment segments 13A and 13A, and the wall of the spectacle frame body constructed in this way The body is sequentially connected in the axial direction of the drill holes H ₁ and H ₂ .

The main wall portions 12, 12 are formed by arcuate plate-shaped segments 11 ... Which are bolted in the axial direction and the circumferential direction of the drill holes H ₁ , H ₂ . A bolt is attached to the arc-shaped segment 11
.. in which a bolt insertion hole 16a is formed are embedded as a connecting portion by a nut.

FIG. 2 is a diagram showing the branch segment 13A of FIG. This branch segment 13A has a Y-shaped exterior wall surface 3
0a, 30b, and further has an end face 31 connected to the end 15a of the branch support 15 and side faces 32, 32 connected to the ends 21, 21 of the main walls 12, 12. . Wall surface 30 of branch segment A
Joint fittings 16, 16 with a bolt insertion hole 16a formed as a connecting part by bolts and nuts on a, 30b and side surfaces 32, 32.
・ Is buried and the side surfaces 32, 32 are the end portions of the main wall portions 12, 12.
21,21 and bolts and nuts are combined. As shown in FIG. 3, the exterior Y-shaped wall surfaces 30a and 30b are arranged in a zigzag manner in the axial direction of the lining tubular wall body 20 with the branch segment 13A and the arc plate segments 11c and 11d. As described above, bolts and nuts are alternately coupled.

As shown in FIG. 3, arc-shaped plate segments 11c and 1
1d have different lengths, and their ends (main wall 12,1
2 end portions 21 and 21 are formed in a tapered shape, and are connected to the side surfaces 32 and 32 of the branch segment 13A by bolts and nuts, respectively.

The branch segment 13B shown in FIG.
It is a modification of the branch portion segment 13A shown in the figure. The branch segment 13B has wall surfaces 30a, 30b having a Y-shaped appearance, and further has an end face 3 connected to the end 15a of the branch support 15.
1 and the first side surface 4 connected to the end portions 21 and 21 of the main wall portions 12 and 12
2, 42 and second side surfaces 43, 43 are separated from each other by step portions 44, 44.

Wall surfaces 30a, 30b of branch segment 13B and first side surfaces 42, 4
2 and the second side surfaces 43, 43 are joint fittings 16, 16 in which bolt insertion holes 16a are formed as connecting portions by bolts and nuts.
・ ・ Is buried. The first side surfaces 42, 42 and the second side surfaces 43, 43 are bolt-nut coupled to the end portions 21, 21 of the main wall portions 12, 12. In addition, the exterior Y-shaped wall 30a,
As shown in FIG. 5, 30b are bolts and nuts which are alternately arranged so that the branch segment 13B and the arcuate plate-shaped segments 11e and 11f are arranged in a staggered manner in the axial direction of the lining tubular wall body 20. Be combined.

As shown in FIG. 5, arc-shaped plate segments 11e and 1
1f have different lengths, and their ends (main wall 12,1
2 end portions 21 and 21 are composed of first end portions 21a and 21a and second end portions 21b and 21b which are formed in a tapered shape with a stepped portion 21c therebetween, and the first end portion 21a, 21a is respectively bolt-nut coupled to the first side surfaces 42, 42 of the branch segment 13B, and the second ends 21b, 21b are the second side surfaces 4 of the branch segment 13B.
Bolts and nuts are combined with 3,43 respectively. The fourth
As shown in FIG. (B), the branch segment 13C when the first side surfaces 42, 42 and the second side surfaces 43, 43 are not tapered is also an example of the above modification.

As described above, by arranging the branching segments 13A and 13B in the above-described configuration, the arc-shaped segment 11, the upper branching segment 13, and the lower branching segment 14 are lined with one type of branching segment. The tubular wall bodies 20 can be arranged in a staggered manner in the axial direction.

Furthermore, by providing the branching segment 13A, 13B in the above-described configuration, the branching segment 13A, 13B,
It also functions as a key segment.

The above has described the case where the drilled holes H ₁ and H ₂ are arranged horizontally, but also in the case where these are arranged vertically, the tubular wall body 20 for lining of the present invention is similarly applied. be able to.

Further, the branch segment 13 of the present invention is not limited to the one shown in FIGS. 2 and 4.

[Advantages of the Invention] As described above, the lining tubular wall body of the present invention includes the main wall portion having a C-shaped cross section and the main wall portion having an inverted C-shaped cross section, which are composed of a plurality of arc plate segments. It is composed of a branch portion segment that joins the main wall portions, and a branch portion support body that connects the branch portion segments. The branch portion segment has an end face that is connected to the branch portion support body and a C-shaped cross section. The branch segment also functions as a key segment because it has a side wall connected to the wall branch portion and the main wall portion having an inverted C-shaped cross section, and each side surface is formed in a tapered shape. To do. Therefore, the branch segment can be easily attached to the main wall, and the work efficiency can be improved, so that the construction cost can be reduced. In addition, on the sides of these bifurcation segments,
When arcuate segments with different lengths are provided alternately, the arcuate segment, the upper branch segment and the lower branch segment are staggered in the axial direction of the lining tubular wall body with one type of branch segment. Since they can be arranged in a shape, the cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a side view of a tubular wall body for lining of an embodiment of the present invention, and FIGS. 2 and 4 (a) and (b) are schematic configurations showing examples of a branch segment of the present invention. FIGS. 3 and 5 are plan views showing an assembled state when the branch segment of FIGS. 2 and 4 are used, and FIG. 6 is a conventional tubular wall for lining. FIG. 7 is a side view and FIG. 7 is a plan view showing an assembled state of the key segment and the arc-shaped plate segment of FIG. 11 …… Arc plate segment, 12 …… Main wall, 13A, 13B…
… Branch segment, 15 …… Branch support, 20 …… Cylinder wall for lining, 21 …… End, 31 …… End face, 32 …… Side, 42
...... First side, 42 ...... Second side, H ₁ , H ₂ ...... Drilling holes.

Claims (2)

(57) [Claims] 1. A cylindrical wall body for lining an excavation hole, wherein two excavation holes each having a circular cross section are formed so as to partially overlap each other, and the cylindrical wall body for lining is a plurality of arcs. A main wall portion having a C-shaped cross section and a main wall portion having an inverted C-shaped cross section, and a branch segment connecting the end portions of these main wall portions,
A branch portion support body that connects between the branch portion segments, and the branch portion segment includes an end surface connected to the branch portion support body, a main wall portion having a C-shaped cross section, and a main wall portion having an inverted C-shaped cross section. A cylindrical wall body for lining an excavation hole, which has a side surface to be connected and each side surface is formed in a tapered shape. 2. The tubular wall body for lining an excavation hole according to claim 1, wherein arcuate plate-shaped segments having different lengths are alternately joined to the side surfaces of the branching segment.