JP4430210B2 - Method of placing secondary lining concrete - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for placing secondary lining concrete, and more particularly, to a placing method capable of securely and easily compacting a tunnel top end.
[0002]
[Prior art]
When building a tunnel using the shield method, concrete lining is applied to the inner periphery of the segment. In this case, a centle (steel formwork) is provided on the inner periphery of the shield, and concrete is placed in the gap between the centle and the segment.
[0003]
[Problems to be solved by the invention]
In order to place concrete densely, it is necessary to compact, that is, to give vibration to the placed fresh concrete.
The tunnel side walls can be compacted by inserting a vibrator between the segment and the center through the inspection window.
However, it is difficult to compact the tunnel top end and both shoulders by the same method because the reinforcing bars are complicated. In particular, the back of the reinforcing bars could not be compacted because the vibrator did not reach.
Further, as a conventional example of a method for compacting the tunnel top end, there is also a method disclosed in, for example, Japanese Patent Application Laid-Open No. 7-48994. However, this method is a method in which the compaction is performed only by the pressing force generated by the reciprocating motion of the movable plate without using a vibrator such as a vibrator, so that it has been difficult to sufficiently perform the compaction. In particular, it was difficult to compact the back part of the reinforcing bars.
[0004]
In other words, conventionally, it has been difficult to sufficiently compact the tunnel top end in the placement of secondary lining concrete.
An object of the present invention is to enable easy and sufficient compaction of secondary lining concrete also at the tunnel top end and both shoulders.
[0005]
[Means for Solving the Problems]
In order to solve the above problems, the invention according to claim 1 is a method for placing secondary lining concrete (100), wherein a gap (130) between a segment (120) and a formwork (for example, centle 110) is provided. In addition, a guide means (for example, guide rail 2) in the tunnel extending direction and a vibration generating means (for example, rod-like vibrator 1) moving along the guide means are installed, and the gap is formed from the existing side (for example, the lap portion 3 side). Concrete is placed while being compacted by the vibration generating means, and the vibration generating means is moved from the existing side toward the end plate (4) along the guide means as the concrete is filled.
Further, in the present invention, a rod-like vibrator is used for the vibration generating means, a guide rail for moving the rod-like vibrator on the guide means is moved, and the guide rail is positioned on the back surface of the reinforcing bar arranged at the top of the tunnel. It is characterized by that.
[0006]
According to the first aspect of the present invention, since the vibration of the vibration generating means is directly transmitted into the concrete, the concrete can be compacted efficiently and sufficiently.
Further, since the vibration generating means compacts the concrete while moving from the existing side to the side plate side with the filling of the concrete, it is not necessary to make the vibration generating means large (or long). Therefore, the vibration generating means can be moved without using a large-scale device. In addition, since the guide means is provided, the vibration generating means moves reliably, and finally is reliably pulled out from the side plate side.
That is, by applying this method to the tunnel top end and both shoulders, the concrete can be compacted easily and reliably at the tunnel top end and both shoulders. In particular, since the vibration generating means can be easily arranged on the back side of the reinforcing bar, the back side of the reinforcing bar can be compacted reliably.
[0007]
The invention according to claim 2 is the method of placing secondary lining concrete according to claim 1, wherein the guide means is a rail-like member (for example, guide rail 2), and the rail-like member is a secondary lining. It also functions as a concrete rebar.
According to the invention described in claim 2, since the rail-like member as the guiding means also serves as the setup reinforcing bar, the cost can be reduced.
[0008]
The invention according to claim 3 is the method of placing secondary lining concrete according to claim 1 or 2, wherein the connecting wire (11) extended from the vibration generating means is covered with a flexible hose (12), and the tread board side is released. It is drawn out from the end.
According to invention of Claim 3, since the connection line is covered with the flexible hose, it can make small by winding up or bundling the part extracted among the connection lines. Therefore, the working space for drawing can be reduced.
Here, the connection lines include lines that electrically connect the vibration generating means and the outside, such as power cables and signal lines.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a method for placing the secondary lining concrete 100 at the tunnel top end according to the embodiment of the present invention will be described with reference to the drawings.
As shown in FIG. 1, this method is a method using a rod-like vibrator 1 and its guide rail 2 installed in a gap 130 between a centle 110 (form frame) and a segment 120.
[0010]
The rod-shaped vibrator 1 has a well-known rod-shaped vibrator main body (not shown) and its connection line 11 housed in a flexible hose 12 and is directed from the end plate 4 (end plate side open end) toward the lap portion 3 (existing side). Inserted and slidably mounted on the guide rail 2.
Here, the rod-like vibrator main body can be inserted to the lap portion 3 of the gap 130, that is, the deepest portion. The connection line 11 includes a power cable, a signal line, and the like.
Further, the connecting wire 11 and the flexible hose 12 can be wound up.
[0011]
As shown in FIGS. 1 and 2, the guide rail 2 is an angle that is substantially L-shaped in section and is suspended and fixed from the set-up bar attaching portion 121 of the segment 120 using the bracket 5 in a concave direction. It is installed in the gap 130 in the tunnel extending direction. That is, the guide rail 2 is a member that slidably mounts the rod-like vibrator 1 and guides it in the tunnel extending direction.
Here, the guide rail 2 also serves as a setup line for the secondary lining concrete 100. That is, the reinforcing bar 100a of the secondary lining concrete 100 is built in a predetermined shape by being assembled to the guide rail 2.
[0012]
As shown in FIG. 3, the bracket 5 has a structure in which a bolt hole 5a is provided in the upper part of a substantially rectangular steel plate and a guide rail holding port 5b is provided in the lower part. That is, by using the bolt hole 5a, the bolt, and the nut, the guide rail 2 is inserted and placed in the guide rail holding port 5b and held by being assembled to the setup bar mounting portion 121.
[0013]
The top end portion of the secondary lining concrete 100 is placed by the following steps using the bar-shaped vibrator 1 and the guide rail 2 described above.
That is, as shown in FIG. 2, the inspection window 111 located closest to the lap portion 3 among the plurality of inspection windows 111 (also serving as the concrete inlets) provided in a plurality of lines in the tunnel extending direction at the top end of the center 110. Then, fresh concrete 100b is poured into the gap 130, and the concrete is placed in the gap 13 from the lap portion 3 side. At this time, the rod-like vibrator 1 is disposed at the deepest part of the gap 130 and operated to directly vibrate and compact the injected fresh concrete 100b.
[0014]
And as pouring of the fresh concrete 100b advances and the concrete filling part in the space 130 spreads toward the end plate 4 side, the rod-like vibrator 1 is pulled from the end plate 4 and moved to the end plate 4 side. That is, the whole concrete filling completion part is compacted by moving the rod-shaped vibrator 1 according to the progress of the concrete filling part. At this time, the fresh concrete 100b is directly vibrated and compacted, so that compaction can be reliably performed.
[0015]
Here, portions of the connecting wire 11 and the flexible hose 12 drawn out from the end plate 4 side are wound and held by a winding device or the like. Therefore, it is not necessary to secure a large working space ahead of the end plate 4 or to prepare a special drawing device.
[0016]
Therefore, according to this Embodiment, the secondary lining concrete 100 can be compacted easily and reliably also in the tunnel top end part. In particular, since the rod-like vibrator 1 and the guide rail 2 are located on the back surface (segment 120 side) of the reinforcing bar 100a, the back surface can be reliably compacted.
Moreover, since the guide rail 2 serves as the setup line of the secondary lining concrete 100, cost can be reduced.
[0017]
In addition, this invention is not restricted to this Embodiment, You may apply to the concrete placement of the part (for example, both shoulders etc.) outside a top end site | part among secondary lining concrete.
Moreover, the shape, structure, etc. of the guide rail 2 should just be a shape and a structure which can guide a rod-shaped vibrator from the lap | wrap part 3 to the end plate 4. FIG.
In addition, it is needless to say that the specific configuration of each part can be changed as appropriate.
[0018]
【The invention's effect】
According to the first aspect of the present invention, the concrete can be compacted easily and reliably at the tunnel top end and both shoulders. In particular, since the vibration generating means can be easily arranged on the back side of the reinforcing bar, the back side of the reinforcing bar can be compacted reliably.
[0019]
According to the invention described in claim 2, since the rail-shaped member as the guide means also serves as a setup reinforcing bar, the cost can be reduced.
According to the third aspect of the present invention, it is possible to reduce the work space for pulling out because the portion pulled out of the connecting wire can be wound or bundled.
[Brief description of the drawings]
FIG. 1 is a schematic vertical sectional view of an upper part of a tunnel for explaining an embodiment of the present invention.
FIG. 2 is an enlarged view of a main part of FIG.
FIG. 3 is a schematic cross-sectional view of the upper portion of the tunnel shown in FIG.
[Explanation of symbols]
1 Bar vibrator (vibration generating means)
2 Guide rail (rail-shaped member)
3 Wrap part 4 End plate 11 Connection line 12 Flexible hose 100 Secondary lining concrete 110 Centle (formwork)
120 Segment 130 Air gap

Claims (3)

In the gap between the segment covering the inner wall surface of the tunnel and the formwork installed inside the segment, guide means in the direction of tunnel extension and vibration generating means moving along the guide means are installed, and the existing side A concrete lining is placed in the gap while being compacted by the vibration generating means, and the vibration generating means is moved from the existing side to the side plate side along the guide means as the concrete is filled. A concrete placement method,
A rod-like vibrator is used for the vibration generating means, a guide rail for moving the rod-like vibrator on the guiding means is moved, and the guide rail is positioned on the back of a reinforcing bar arranged at the top of the tunnel. Characteristic secondary lining concrete placement method. The method for placing secondary lining concrete according to claim 1, wherein the guide rail also serves as a setup reinforcing bar for secondary lining concrete. 3. The method of placing secondary lining concrete according to claim 1 or 2, wherein the connecting line extending from the bar-shaped vibrator is covered with a flexible hose and drawn from the end face side open end.

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