JPH0730798Y2 - Concrete segment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION "Industrial field of application" The present invention relates to a concrete segment suitable for use in constructing a tubular wall for lining an excavation hole, in particular a concrete segment body. The present invention relates to a concrete segment in which a space for operating a bolt is opened on both sides of a steel plate, and a side plate made of steel is provided, and a bolt hole is formed in the side plate on site.

“Prior Art” In recent years, as a large-section shield construction method for constructing a large-section tunnel structure such as a railway tunnel, what is called a double circular special section shield construction method has been performed. 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. , On the inner surface of the excavated hole, for example, a concrete segment (hereinafter referred to as RC segment) is assembled to form a tubular wall body, and a plurality of the tubular wall bodies are connected along the hole (primary lining), After filling the back surface of the segment of this primary lining, that is, the filling material that fills the gap between the segment and the ground, concrete is rolled up on the inner surface of the primary lining (secondary lining), and the ground is ground by them. In support
It constitutes a predetermined inner space.

FIG. 4 shows one structural example of the tubular wall for lining constructed by such a construction method.

That is, the cylindrical wall body shown in the figure is a main wall part 2, 2 having a C-shaped cross section and an inverted C-shaped cross section, which are formed by connecting the RC segments 1 having an arc plate shape.
Is constructed, and the branch portion RC segments 3, 3 are connected between the upper end portions and the lower end portions of these main wall portions 2, and the branch portion R positioned above and below is constructed.
The middle pillar 4 is built between the C segments 3 and 3, and the eyeglass frame-shaped wall bodies thus constructed are sequentially connected in the axial direction of the excavation hole.

The RC segment 1, the branching RC segment 3 and the center pillar 4 which form the cylindrical wall body are connected by bolts and nuts, and the bolt insertion holes 5a are connected to the members by bolts and nuts. The formed fittings 5, 5, ... Are buried.

The branch RC segment 3 is required for the construction of the tubular wall body, and the branch RC segment 3 is a Y-shaped member in appearance. That is, the branched RC segment 3 has a base 3c having a rectangular cross section whose end face is connected to the center pillar 4, and a square cross section which is branched from the base 3c and has its end face connected to the main walls 2 and 2. And the connecting arm portions 3a and 3b.

Here, of the two connecting arm portions 3a and 3b, the connecting arm portion 3a is formed longer than the connecting arm portion 3b, and the connecting arm portion 3a is
The tip end side extends in an arc shape with the same radius of curvature as the RC segment 1. One of the connecting arm portions 3a, 3b is formed long and the other is formed by segment 1,1 ...
This is because the branch portion segments 3, 3 are arranged in a staggered manner in the axial direction of the cylindrical wall body (because the stresses in the cylindrical wall body can be dispersed by staggered arrangement). By the way, 2 like this
In a continuous tunnel, unlike a general shield tunnel, the tunnel is formed long on the left and right, so depending on the constraints of the excavation ground, the left and right tunnels may be branched or the entire tunnel may be divided. In some cases, it may be required to rotate the two-unit type.

"Problems to be solved by the device" However, in such a case, the conventional RC segment 1
Since the positions of the bolt holes 5a of the joint fittings 5 embedded in the joint end faces that are the left and right sides are set to a predetermined position in advance, as described above, the left and right sides of the double tunnel are branched, or If the entire tunnel is rotated, the positions of the bolt holes 5a of the RC segments 1 that are adjacent to each other in the axial direction of the tunnel are displaced from each other, which may cause a situation in which the RC segments 1 cannot be joined.

The present invention is intended to improve the problems remaining in such conventional techniques.

[Means for Solving the Problems] Accordingly, the present invention is directed to a concrete segment for forming a lining wall for an excavation hole that is connected to each other to form a concrete structure curved in an arc plate shape with a constant curvature. Of the segment body, steel side plates provided with a space for bolt operation on both sides along the longitudinal direction of the segment body, and between the side plate and the segment body located on the outer surface side of the segment body. A ceiling plate that covers the opening of the side plate, and a gable plate that is located at both ends of the side plate and that covers the opening between the side plate and the segment body, and the segment body has at least a portion between the gable plates at both ends. Provided in a continuous state, the side plate is intermittently connected to the concrete body through a plurality of reinforcing plates with a space between the side plate and the plurality of reinforcing members. It is characterized in that a through hole, through which a bolt used for connecting the segments to each other is inserted, is not formed between the connecting portion with the plate and the connecting portion.

[Operation] According to the concrete segment having the above-described configuration, at the site, a bolt hole is formed in the side plate by drilling a hole in the side plate in accordance with the position of the bolt hole formed in the joint fitting of the adjacent segment. Therefore, it is possible to easily adjust the position of the bolt hole. Further, the space between the segment body and the side plate can be used to perform bolting regardless of the position of the bolt hole.

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1 to 3. In these drawings, reference numeral 10 denotes a main body made of concrete and a reinforcing bar required inside. A segment body that is embedded, and the segment body
10 is formed in an arc plate shape as a whole. On both end faces 10a, 10a of the segment body 10, joint fittings having bolt holes formed as connecting portions by bolts and nuts, respectively.
11 is buried, and side plates 12 made of steel are provided on both side surfaces along the longitudinal direction of the segment main body 1 with a space S for bolt operation opened. Further, on the outer surface side of the segment body 10, a ceiling plate 13 that covers the opening between the side plate 12 and the segment body 10 is provided, and at both ends of the side plate 12, the side plate 12 and the segment body 10 respectively. A gable plate 14 is provided to cover the opening between the and.

And in the embodiment, the side plate 12 is formed in a curved shape along the longitudinal direction so as to have substantially the same shape as the side surface of the segment body 10, and between the side plate 12 and the segment body 10. A plurality of reinforcing plates 15 are attached at equal intervals in order to maintain the rigidity of the side plate 12. The reinforcing plate 15 and the ceiling plate 13 are structured to be integrated with the segment main body 10 by embedding a part thereof in the segment main body 10 via an anchor rebar or the like.

Next, a method of using the concrete segment in constructing a double shield tunnel or the like and its action will be described.

For example, during the lining work of a double shield tunnel, it becomes necessary to rotate the tubular wall for lining the excavation hole around its axis, and the bolt holes of the segments adjacent to each other in the axial direction of the tunnel are generated. In the case where the positions of the above are shifted from each other, the concrete segment 10 is used as a segment to be connected to the existing segment. At this time, at the site, a hole is formed in the side plate 12 on the side to which the concrete segment 10 is connected by a drill or the like in accordance with the bolt hole of the existing segment, and a bolt insertion hole 12a is formed in the side plate 12 of the concrete segment 10. A bolt 16 is passed through the insertion hole 12a and fastened with a nut 17 (see FIG. 3).

In the embodiment, the position of the bolt hole can be adjusted by drilling a hole in the field while aligning the position of the bolt hole with the side plate 12 of the segment 10 as described above. When the left and right sides of the tunnel are branched or the entire tunnel is rotated, the positions of the bolt holes 5a of the RC segments 1 that are adjacent to each other in the axial direction of the tunnel may deviate from each other and the RC segments 1 may not be joined together. However, the segments can be easily connected to each other.

It should be noted that the various shapes, dimensions, etc. of the respective constituent members shown in the above embodiment are examples, and can be variously changed based on the size of the tunnel to be applied, design requirements, and the like.

[Advantage of Invention] As described above, the present invention is a concrete segment for forming a tubular wall for lining a drilling hole by connecting them to each other. A segment body made of concrete, steel side plates arranged by opening spaces for bolt operation on both sides along the longitudinal direction of the segment body, and side plates and segment bodies located on the outer surface side of the segment body. A ceiling plate that covers the opening between the side plates, and a gable plate that is located at both ends of the side plate and covers the opening between the side plate and the segment body,
The segment main body is provided in a state where at least a part is continuous between the end plates, and the side plate is intermittently provided on the concrete main body at intervals with the segment main body and via a plurality of reinforcing plates. Since it is characterized by being connected, at the site, a hole is drilled in the side plate in accordance with the position of the bolt hole formed in the joint fitting of the adjacent segment, and the bolt hole is formed in this side plate. As a result, it becomes possible to easily adjust the position of the bolt holes, so that, for example, the left and right sides of the double tunnel can be branched, or the entire tunnel can be rotated to move in the axial direction of the tunnel. Even if there is a possibility that the positions of the bolt holes of adjacent RC segments will be displaced from each other and RC segments cannot be joined together, the segments will be smoothly connected. There is an excellent effect such that they can be connected to each other. In addition, the space between the segment body and the side plate can be used to secure a working space for bolting regardless of the position of the bolt hole, and despite the segment being separated from the side plate.
Strength can be secured by the reinforcing plate. Further, since the through hole through which the bolt used for connecting the segments to each other is inserted is not formed, it is possible to easily perform the alignment by forming the through hole at an arbitrary position using the working space. .

[Brief description of drawings]

1 to 3 show an embodiment of the present invention.
FIG. 1 is a perspective view of a concrete segment, FIG. 2 is a cross-sectional view thereof, FIG. 3 is a cross-sectional view showing a state in which segments are connected to each other, and FIG. 4 is a front view shown for explaining a conventional technique. . 10 …… Container body, 11 …… Fittings, 12 …… Side plate, 13 ……
Ceiling board, 14 ... Wife board, 15 ... Reinforcement board.

 ─────────────────────────────────────────────────── ───Continued from the front page (56) Bibliography Sho 60-4698 (JP, U) Steady Sho 48-27638 (JP, U) Japanese Patent Sho-46-35908 (JP, B2)

Claims (1)

[Scope of utility model registration request] 1. A concrete segment body which is connected to each other to form a wall body for digging holes and which is curved in an arc plate shape with a constant curvature, and a segment body of the segment body. Steel side plates arranged to open a space for bolt operation on both sides along the longitudinal direction, and a ceiling plate located on the outer surface side of the segment body and covering an opening between the side plate and the segment body, The side plate is provided at both ends of the side plate and covers the opening between the side plate and the segment main body, and the segment main body is provided in a state where at least a part of the end plate is continuous between the side plates. Is intermittently connected to the concrete body through a plurality of reinforcing plates with a space between the segment body and the bolts used for connecting the segments to each other. Concrete segments, wherein a through hole is not formed to be.