JP3615843B2 - Installation method of flexible segment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a segment that forms a cylindrical wall body in the axial direction of an excavation hole by connecting a plurality of them to each other, and in particular, relates to a method for installing a flexible segment capable of providing flexibility at a connection location. Is.
[0002]
[Prior art]
As a method for constructing a tunnel, a so-called shield method is generally used in which a tubular wall body is constructed by assembling segments (mainly made of concrete or steel) on the inner surface side of an excavation hole.
By the way, in this shield method, in particular, when a tunnel is constructed in soft ground, the constructed tunnel may be refracted and collapsed due to an earthquake or uneven settlement of the ground. For this reason, an appropriately flexible ring is interposed in the axial direction of the cylindrical wall body.
[0003]
An example of this type of ring is shown in FIG. In the figure, reference numeral 1 denotes a flexible ring. This flexible ring 1 is provided with a ring-shaped water-stopping rubber 3 and 4 formed in a bellows shape between a pair of ring-shaped frame rings 2. An annular cover rubber 5 is provided. In addition, each frame ring 2 is provided with an axially movable bar 6 in which locking portions 7 made of washers or the like are attached to both ends by bolts 8 at intervals in the circumferential direction. It is structured.
And according to the cylindrical wall body provided with the said flexible ring 1, when external force is added, between frame rings 2 expands and contracts, external force is released, and a cylindrical wall body Collapse is to be prevented. At this time, the bellows-like water-stopping rubbers 3 and 4 and the cover rubber 5 provided between the frame rings 2 are expanded and contracted while ensuring water-stopping.
[0004]
[Problems to be solved by the invention]
However, since the flexible ring 1 has a structure that can be bent while ensuring water-stopping properties, the flexible ring 1 has to have a complicated structure as described above, and is extremely expensive. It was.
Moreover, in such a complicated flexible ring 1, there also existed a problem that a great effort was required for the installation operation | work.
[0005]
The present invention has been made in view of the above circumstances, and an object thereof is to provide an inexpensive method for installing a flexible segment that can be installed very easily and ensure flexibility.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the flexible segment installation method according to claim 1 is a cylindrical wall body configured by connecting a ring formed by joining segments in the circumferential direction in the axial direction of the excavation hole. The flexible segment is provided in the middle of the axial direction of the arc-shaped plate, and a flexible member elastically deformable in the longitudinal direction is attached to the joint surface of the segment body of the arc-shaped plate. A mounting plate that is thinner than the flexible member and has an installation plate portion disposed along the joining surface is attached, and the flexible segment is fastened and fixed to another adjacent segment, and then the installation plate It is characterized by pulling out to the inner surface side and removing it.
As a result, when the flexible segment and another adjacent segment are joined, the flexible member is pressed by the joining surface of these segments to be elastically deformed. Thereafter, by pulling out the installation plate, the installation plates are joined to each other in a state where a gap of the thickness of the installation plate portion of the installation plate is formed between the respective joining surfaces.
[0007]
That is, since the joint surfaces can be brought close to and away from each other with a gap dimension formed between these joint surfaces, for example, when an external force is applied from the direction intersecting the axial direction of the cylindrical wall body, The cylindrical wall body is bent and the external force is released in a state where the sealing performance is secured by the flexible member at the joining portion of the segments, and the collapse of the cylindrical wall body is prevented.
[0008]
The flexible segment installation method according to claim 2 is the flexible segment installation method according to claim 1, wherein the installation plate is disposed on the installation plate portion and an inner surface side of the segment main body. Since it is provided on the inner surface side of the main body, it is formed in an L-shaped cross section consisting of a fixing plate portion having a hole portion communicating with the screw portion, and a bolt is fastened from the hole portion of the fixing plate portion to the female screw portion. By doing so, the fixed plate portion is fixed to the inner surface side of the segment body.
As a result, the installation plate is attached to the flexible segment by being inserted into the threaded portion and fastened to the threaded portion because it is provided in the segment body from the hole formed in the fixed plate portion.
[0009]
Installation of the flexible segment according to claim 3, said at the installation method of the flexible segment according to claim 2, in the fixing plate portion of the installation plate, Ri Contact hook is provided, said fixing plate part After removing the bolt fixed to the inner surface side of the segment main body, the hook is pulled toward the inner surface side of the segment main body to remove the installation plate .
Accordingly, by pulling the hook provided on the fixed plate portion, the installation plate portion is pulled out from between the joined segments, and the installation plate is removed.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of a method for installing a flexible segment according to the present invention will be described with reference to the drawings.
In FIG. 1, reference numeral 11 denotes a flexible segment. The flexible segment 11 is composed of a segment main body 12 made of an arc-shaped plate formed from concrete, and the flexible segment 11 is joined in the circumferential direction to form an annular shape constituting a cylindrical wall body. It is supposed to be a ring of.
As shown in FIG. 2, one joining surface 12a of the segment main body 12 constituting the flexible segment 11 has a flexible member 15 made of, for example, hard rubber having a thickness dimension T1 in the longitudinal direction on the outer peripheral side thereof. Is provided. In addition, the code | symbol 16 in FIG. 1 is a recessed part formed in order to penetrate a volt | bolt to the penetration hole 18 of the joint board 17 provided in order to fasten the segment main bodies 12 with bolts and nuts. Reference numeral 19 denotes an injection hole formed for injecting the backing material into a gap with the natural ground formed on the outer peripheral side of the segment body 12, a so-called tail void.
[0011]
An installation plate 21 having an L-shaped cross section is attached to the segment body 12. The installation plate 21 is formed of a steel plate or the like. When the fixing plate 22 is fixed to the inner surface of the segment main body 12 and the fixing plate 22 is fixed to the inner surface of the segment main body 12, the segment main body 12 and the installation plate part 23 arrange | positioned in the state contact | abutted to 12 joining surfaces 12a.
[0012]
In addition, a plurality of fixing holes 24 are formed in the fixing plate portion 22 of the installation plate 21, and bolts 25 are inserted through the fixing holes 24 as shown in FIG. It can be fixed by screwing into the provided insert nut 26. Further, the fixing plate portion 22 of the installation plate 21 is formed with a window portion 27 that communicates with the recess 16 formed in the segment body when the fixing plate portion 22 is fixed to the inner surface side of the segment body 12. The fastening bolt can be inserted from the recess 16 into the insertion hole 18 of the joint plate 17 through these window portions 27.
The installation plate portion 23 constituting the installation plate 21 is formed with a notch 28 at a position facing the insertion hole 18 of the joint plate 17 provided in the segment body 12. Further, a pulling hook 29 is provided on the fixed plate portion 22 of the installation plate 21.
[0013]
Next, the installation method of the flexible segment 11 using the installation board 21 is demonstrated along the procedure.
(1) First, the installation plate 21 is attached in advance to the segment body 12 of the flexible segment 11 (see FIG. 3).
(2) Then, the flexible segment 11 is fastened and fixed to another adjacent segment S with bolts and nuts.
In this way, the flexible member 15 having the thickness T1 is substantially the same as the thickness of the installation plate portion 23 of the installation plate 21 as shown in FIG. 2 due to the joining surfaces 12a and Sa of the flexible segment 11 and the segment S. It compresses to thickness dimension T2, and it joins in the state where the installation board part 23 of the installation board 21 was clamped (refer FIG. 4).
[0014]
(3) After that, when the jack thrust of the shield machine is reduced, the bolt 25 that has fixed the fixed plate portion 22 to the inner surface of the segment main body 12 is removed, and the hook 29 is pulled to the inner surface side, whereby the installation plate portion 23 is Pull out from between the joint surfaces 12a and Sa, and remove the installation plate 21 (see FIG. 5).
If it does in this way, the cylindrical wall body by which the flexible segment 11 and the adjacent segment S were joined in the state which opened the clearance gap only by thickness dimension T2 of the installation board part 23 of the installation board 21 will be constructed | assembled. And according to the cylindrical wall body which has the flexible segment 11 joined in this way, the cylindrical wall body T is made into the cylindrical wall body T from the direction which cross | intersects an axial direction by the earthquake, the uneven settlement of the ground, etc. When an external force to be bent is applied, as shown in FIG. 6, the flexible member 15 on the inner peripheral side of the cylindrical wall T is bent slightly by being compressed on the inner side in the bending direction. The external force applied to the cylindrical wall body T is released and the collapse of the cylindrical wall body T is prevented. That is, in the bending direction, the flexible member 15 is compressed to the thickness dimension T3 as shown in FIG. In addition, the bolts and nuts that join the segment body 12 and the adjacent segment S are slightly loosened so that the joining surfaces 12a and Sa can be separated to the dimension T4 (T4 <T1), thereby further improving the bending operation. Can be obtained.
[0015]
Thus, according to the installation method of the flexible segment of the said embodiment, after joining the segment main body 12 with a volt | bolt and a nut, a complicated adjustment operation | work is performed by the simple operation | work which only pulls out the installation board 21. In addition, the flexible segment 11 can be installed very easily to bend the cylindrical wall body T so as to release the external force from the direction intersecting the axial direction, and the labor required for the installation work can be greatly reduced. .
Moreover, after removing the installation board 21, it can divert and use it at the time of installation of the other flexible segment 11, and is very economical.
[0016]
It should be noted that a friction reducing material such as a polytetrafluoroethylene sheet is applied or applied to the installation plate 21 used when joining the flexible segment 11, particularly the surface of the installation plate portion 23. By reducing the friction coefficient, the installation plate 21 can be pulled out satisfactorily. Note also, in the above embodiment, the case of a concrete segment body 12 has been described as an example, as shown in FIGS. 7 and 8, the even steel segment main body 12 can be applied in Of course. In this case, the installation plate 21 is fastened and fixed to the rib 32 disposed on the inner surface side of the segment body 12 by the bolt 34 and the nut 35 via the height adjusting member 33.
[0017]
【The invention's effect】
As described above, according to the flexible segment installation method of the present invention, the following effects can be obtained.
According to the flexible segment installation method of the first aspect, after joining the segment main body, the sealing performance can be secured very easily without performing complicated adjustment work by simply pulling out the installation plate. In addition, it is possible to install a flexible segment that bends the cylindrical wall body and releases an external force from a direction intersecting the axial direction, and the labor required for the installation work can be greatly reduced.
In addition, after the installation plate is removed, it can be diverted and used when installing another flexible segment, which is extremely economical.
[0018]
According to the installation method of the flexible segment according to claim 2, the installation plate is very easily provided by inserting the bolt into the threaded portion and fastening it because it is provided in the segment main body from the hole portion formed in the fixed plate portion. Can be attached to the segment body of the flexible segment.
According to the installation method of the flexible segment according to claim 3, it is very easy to install from the joint location by pulling the hook provided on the fixed plate portion after joining the segment main body and another adjacent segment. By pulling out the plate portion and removing the installation plate, the cylindrical wall can be bent.
[Brief description of the drawings]
FIG. 1 is a perspective view of a flexible segment for explaining a method for installing a flexible segment according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view of the vicinity of the joint surface of the flexible segment for explaining the configuration and structure of the flexible segment used in the flexible segment installation method of the embodiment of the present invention.
FIG. 3 is a cross-sectional view of a joining portion for explaining an embodiment of a method for installing a flexible segment of the present invention.
FIG. 4 is a cross-sectional view of a joining portion for explaining an embodiment of a method for installing a flexible segment of the present invention.
FIG. 5 is a cross-sectional view of a joining portion for explaining an embodiment of a method for installing a flexible segment of the present invention.
FIG. 6 is a cross-sectional view of a cylindrical wall body provided with a flexible segment by the flexible segment installation method of the present invention.
FIG. 7 is a perspective view of a flexible segment for explaining a flexible segment of another structure used in the flexible segment installation method of the present invention.
FIG. 8 is a cross-sectional view of a flexible segment for explaining another structure of the flexible segment used in the flexible segment installation method of the present invention.
FIG. 9 is a cross-sectional view around a flexible ring for explaining the configuration and structure of a conventional flexible ring.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 11 Flexible segment 12 Segment main body 12a, Sa Joint surface 15 Flexible member 21 Installation board 22 Fixing board part 23 Installation board part 24 Hole part 25 Bolt 26 Insert nut (female thread part)
29 Hook S Segment

Claims (3)

A method for installing a flexible segment provided in the axial direction of a cylindrical wall body configured by connecting a ring formed by joining segments in a circumferential direction in the axial direction of a drilling hole,
The flexible segment, which is attached to the joint surface of the segment body of the arc-shaped plate and elastically deformable in the longitudinal direction, is thinner than the flexible member and is disposed along the joint surface. Attach the installation plate with the installation plate part to be
Fasten the flexible segment to the other adjacent segment,
Thereafter, the installation segment is pulled out to the inner surface side and removed, and the flexible segment is installed. The installation plate has an L-shaped cross section comprising the installation plate portion and a fixed plate portion that is disposed on the inner surface side of the segment main body and has a hole portion that is provided on the inner surface side of the segment main body and communicates with the screw portion. The fixed plate portion is fixed to the inner surface side of the segment body by fastening a bolt from the hole portion of the fixed plate portion to the female screw portion. The installation method of the flexible segment of 1. Wherein the fixing plate portion of the installation plate, Ri Contact hook is provided, said fixing plate part after removal of the bolt is fixed to the inner surface of the segment body, pulling the hook to the inner surface of the segment body, The method for installing a flexible segment according to claim 2, wherein the installation plate is removed.

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