JPH0634474Y2 - Joint structure of middle pillar in tubular wall for lining excavation hole - Google Patents

Description

[Detailed Description of the Invention] "Industrial field of application" The present invention relates to a joint structure of a middle pillar in a tubular wall body assembled by segments, which is used for lining a double drill hole. .

"Prior art" In recent years, as a large-section shield construction method for constructing large-section tunnel structures such as railway and road tunnels,
The so-called double-circle special cross-section shield construction method came to be used. This method uses a shield excavator with a structure in which two cylindrical shield excavators are connected, and excavates the ground or the ground into a cross-sectional shape in which two circles are connected in a state where they partially overlap. , On the inside of this drilled hole,
Assemble RC segments to form a tubular wall body and connect multiple tubular wall bodies along the hole (primary lining). The back surface of this primary lining segment, that is, between the segment and the ground. After filling the pouring material to fill the voids, concrete is rolled up on the inner surface of the primary lining (secondary lining), and the ground is supported thereby to form a predetermined inner space.

Then, conventionally, as a cylindrical wall body constructed by the above-mentioned construction method, for example, one shown in FIG. 5 is known.

The cylindrical wall body shown in the figure is constructed by connecting arc-shaped RC segments 1 (hereinafter, referred to as segment 1) into main wall portions 2 having a C-shaped cross section and an inverted C-shaped cross section. Upper end branches located above and below by connecting branch RC segments 3 and 4 (hereinafter, referred to as upper branch segment 3 and lower branch segment 4) between the upper ends and the lower ends of these main wall portions 2, respectively. A middle pillar 5 is built between the section RC segment 3 and the lower end branching segment 4, and the eyeglass frame-shaped wall bodies thus constructed are sequentially connected in the axial direction of the excavation hole.

The segment 1, the upper end branch portion segment 3, the lower end branch portion segment 4, and the center pillar 5 which form the tubular wall body are connected by bolts and nuts, and each of the above members serves as a connecting portion by bolts and nuts. .. in which the bolt insertion holes 6a are formed are embedded.

Although the upper end branch portion segment 3 and the lower end branch portion segment 4 are required for the construction of the above-mentioned tubular wall body, these upper and lower end branch portion segments 3 and 4 are Y-shaped members in appearance. That is, the upper branch portion 3 has a base 3c having a rectangular cross section whose end face is connected to the center pillar 5, and a square cross section which is branched from the base 3c and whose end faces are connected to the main walls 2 and 2. Similarly, the lower end branch segment 4 includes a base portion 4c and a connecting arm portion.
It is composed of 4a and 4b.

Here, of the two connecting arm portions 3a, 3b or the connecting arm portions 4a, 4b, the connecting arm portions 3a, 4a are formed longer than the connecting arm portions 3b, 4b, and the connecting arm portions 3a, 4a, The tip side thereof extends in an arc shape with the same radius of curvature as the segment 1. One of the connecting arm portions 3a and 3b (or the connecting arm portions 4a and 4b) is formed to be long and the other is formed to have segments 1, 1 ... ..) in order to stagger in the axial direction of the cylindrical wall body (in order to increase the lining strength of the cylindrical wall body by arranging them in a staggered manner).

An example of a method of constructing such a tubular wall body will be described. First, in the shield excavator, the lower end branch portion segment 4 is installed, and segment 1 is installed on the left and right sides of the lower end branch portion segment 4 by using an erector or the like. Are sequentially assembled in the circumferential direction to construct the main wall portion 2. Next, when the upper end branch portion segment 3 is bolted between the upper ends of the left and right main wall portions 2 and the middle pillar 5 is built between the upper end branch portion segment 3 and the lower end branch portion segment 4, FIG. A tubular wall body as shown in is completed.

[Problems to be solved by the invention] By the way, in the double-walled cylindrical wall body as described above, the load-bearing capacity of the cylindrical wall body does not decrease even if an unbalanced load is applied to either the left or right main wall portion 2. In order to do so, it is necessary to fix the joints at the upper and lower ends of the center pillar 5 to the upper branch segment 3 and the lower branch segment 4 at two locations that are offset to the left and right main wall portions 2 and 2, respectively. is there. For this reason, conventionally, as shown in FIG. 6, the lower ends of the upper end branch portion 3 and the upper ends of the lower end branch portion segments 4, and the upper and lower ends of the middle pillar 5 are offset to the left and right main wall portions. The fitting metal fittings 7, 7 and the fitting metal fittings 8, 8 which are located in the
The bolts 9 were inserted into the bolt holes of each of the bolts and fastened.

However, in the joint structure as described above, the bolt box 7a of the left joint fitting 7 and the bolt box 8a of the right joint fitting 8 in FIG. There is a problem in that the work must be performed separately in the main wall portions on both sides, a large number of workers are required, and workability is extremely poor.

Further, when the two tubular wall bodies that form the double-walled tubular wall body are arranged vertically, the bolts to the joint fittings located on the lower side are tightened from the lower tubular wall body. Therefore, there is a problem that it becomes extremely difficult to tighten the lower bolt.

The present invention has been made in view of the above circumstances, and bolts are made at two or more positions deviated to the side of each tubular wall when joining the center column to the double tubular wall. It is an object of the present invention to provide a joint structure for a center pillar that can be stopped from one cylindrical wall body.

[Means for Solving the Problem] The joint structure of the middle pillar in the tubular wall for lining the excavation hole of the present invention has an arc plate-shaped segment assembled inside the double excavation hole in the axial direction. Two cylindrical main walls having an opening along are formed, and these main walls are connected at the upper end and the lower end of the opening through the upper branch segment and the lower branch segment, respectively, to form the drill hole. In a joint structure in which a double-walled tubular wall body is formed inside, and a middle pillar arranged in the opening in the tubular wall body is joined to the upper end branch portion segment and the lower end branch portion segment, the upper end branch portion is formed. At the joint between the segment and the lower end branch portion segment and the middle pillar, a through hole is formed that penetrates in the direction in which the two tubular wall bodies forming the double tubular wall body are mutually opened, In this through hole The joint plate of the joint fitting for joining the upper branch segment and the lower branch segment and the middle pillar is arranged along the penetrating direction of the through hole, and the surface of the joint plate facing the joint surface is the penetrating surface. It is exposed in the hole.

[Embodiment] A first embodiment of the present invention will be described below with reference to FIGS. 1, 2, and 5.

Since the double-walled tubular wall body in which the central columns are joined by the joining structure of this embodiment has the same structure as the conventional tubular wall body for lining shown in FIG. 5, FIG. It will be described with reference to FIG. In this double-walled cylindrical wall body, arcuate plate-shaped segments 1 are assembled inside a double-hole drilled hole to form two cylindrical main wall portions 2 and 2 having openings along the axial direction. The main walls 2 and 2 are connected at the upper end and the lower end of the opening through the upper branch segment 3 and the lower branch segment 4, respectively.

Further, the plurality of middle pillars 5 joined to the double-walled cylindrical wall body are arranged in a row along the opening in the cylindrical wall body, and the upper and lower ends thereof are respectively the above-mentioned. It is joined to the upper end branch segment 3 and the lower end branch segment 4.

As shown in FIG. 1 and FIG. 2, the joining structure between the middle pillar 5 and the upper branching segment 3 and the lower branching segment 4 has the upper branching segment 3 and the lower branching segment 4 and the middle. A through hole penetrating through the two tubular wall bodies forming the double tubular wall body in a direction in which the two tubular wall bodies open to each other is formed at a joint portion with the pillar 5, and the upper end branch is formed in the through hole. Joint fittings embedded in the partial segment 3, the lower end branch segment 4, and the center pillar 5, respectively.
11 are arranged and bolt boxes 11a inside each of the joint fittings 11 open to the left and right sides of the double-walled cylindrical wall body, and join the upper end branch segment 3 and the middle pillar 5 to each other.
11, 11 and the joint fittings 11, 11 for joining the lower branching segment 4 and the middle pillar 5 bring the joining surfaces of the joining plates 12, 12 into close contact with each other, and the tightly joined joining plates 12, 12 are provided on both left and right sides. It is bolted by bolts 9 and 9 at two locations that are offset.

When the middle pillar is joined to the tubular wall body by such a joining structure, the middle pillar 5 is built between the upper end branch portion segment 3 and the lower end branch portion segment 4, and then, for example, the right tubular shape. A joint fitting 11 for arranging a worker in the wall body and joining the branch segment 3 and the middle pillar 5 from there
Two bolt holes are formed on both the left and right sides of 11 and two bolt holes are formed on the left and right sides of the joint fittings 11, 11 for joining the lower end branch segment 4 and the middle pillar 5, respectively. Is inserted and the bolts 9 are tightened to join the upper and lower ends of the middle pillar 5 to the lower end of the upper branch segment 3 and the upper end of the lower branch segment 4, respectively.

3 and 4 are views showing a second embodiment of the present invention.

In the joining structure of this embodiment, the joint metal fittings 11 are embedded in the upper and lower ends of the middle pillar 5 as in the first embodiment, but the lower end of the upper branch segment 3 and the lower branch segment 4 are joined. An insert 13 is embedded in the upper end portion.

When joining the middle pillar 5 to the upper end branch portion segment 3 and the lower end branch portion segment 4, the middle pillar 5 is built between the upper end branch portion segment 3 and the lower end branch portion segment 4, and the middle pillar 5 From inside the bolt box 11a of each joint fitting 11 provided at the upper and lower ends, bolts 9 are respectively inserted into the bolt holes of the joint plate 12 of each joint fitting 11, and the bolts 9 are inserted into the upper end branch segment 3 or the lower end branch. The upper and lower ends of the middle pillar 5 are joined to the lower end of the upper end branch segment 3 and the upper end of the lower end branch segment 4 by being fastened to the insert 13 of the partial segment 4.

In addition, in this embodiment, the case where the middle pillar is provided in the opening between the two cylindrical wall bodies is shown, but the middle wall may be provided in the opening, and in that case, the joining structure of the present invention is It can be used as a joint structure between an inner wall and a tubular wall body and a joint structure between adjacent inner walls.

[Advantage of the Invention] According to the joining structure of the middle pillar in the tubular wall for lining the excavation hole of the present invention, the double-column type is formed at the joint between the upper branch segment and the lower branch segment and the middle pillar. A through hole penetrating through the two tubular wall bodies forming the tubular wall body in a mutually opening direction is formed, and the upper end branch portion segment, the lower end branch portion segment and the middle pillar are joined in the through hole. Since the joint plate of the joint metal fitting is arranged along the penetrating direction of the through hole and the surface facing the joint surface of the joint plate is exposed in the through hole, which one of the double-walled tubular wall body is formed. Even from within the tubular wall body, the bolts on both sides of the center column can be tightened, whereby the center column can be efficiently joined, and labor can be saved.

Also, when arranging the two tubular wall bodies above and below,
Both upper and lower bolts can be tightened from the upper tubular wall body, thereby eliminating dangerous work in high places.

[Brief description of drawings]

FIG. 1 and FIG. 2 are views showing a joint structure of a center pillar of a first embodiment of the present invention, FIG. 1 is a sectional view and FIG. 2 is a side view. FIG. 3 and FIG. 4 are views showing the joining structure of the middle pillar of the second embodiment of the present invention, FIG. 3 is a sectional view, and FIG. 4 is a side view. 5 and 6 are views showing a conventional lining wall body. FIG. 5 is a front view showing one structural example of a lining tubular wall body, and FIG. It is sectional drawing which shows a joining structure. 1 ... Segment, 2 ... Main wall, 3 ... Upper branching segment, 4 ... Lower branching segment, 5 ... Middle pillar, 10 ... Through hole 11 ... Fitting, 12 ... Joining plate .

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Kazuo Shimizu 2-6-21 Yaesu, Chuo-ku, Tokyo Rose Bay Yaesu Building Ishikawajima Kenzai Industrial Co., Ltd. (72) Inventor Hirohide Hashimoto 2-6, Yaesu, Chuo-ku, Tokyo No. 21 Roze Bay Yaesu Building Ishikawajima Kenzai Kogyo Co., Ltd. Internal Examiner Junji Yuda (56) References JP 62-182398 (JP, A) JP 59-177437 (JP, A)

Claims (1)

[Scope of utility model registration request] 1. A circular arc plate-shaped segment is assembled inside a double drill hole to form two cylindrical main wall portions having openings along the axial direction, and these main wall portions are the openings. At the upper end and the lower end of the excavation hole are connected to each other via the upper branch segment and the lower branch segment, respectively, to form a double-walled tubular wall body, and the tubular wall body is arranged in the opening in the tubular wall body. In the joining structure for joining the middle pillar to the upper branch portion and the lower branch segment, in the joining portion between the upper branch segment and the lower branch segment and the middle pillar, the double-walled tubular wall body is provided. A through hole is formed that penetrates through the two cylindrical wall bodies that are configured to mutually open, and a joint metal that joins the upper end branch portion segment, the lower end branch portion segment, and the middle pillar in the through hole. A cylindrical plate for lining an excavation hole, characterized in that the joint plate of is arranged along the penetrating direction of the through hole, and a surface of the joint plate facing the joint surface is exposed in the through hole. Joint structure of middle pillar in wall.