JP2002030893A - Method of placing secondary lining concrete - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily and sufficiently compacting the secondary lining concrete even at a top end part and both shoulder parts of a tunnel. SOLUTION: A guide rail 2 is provided in the tunnel extending direction in a clearance 130 between a segment 120 and a center 110, and a bar-like vibrator 2 to be moved along the guide rail 2 is provided. The concrete is placed into the clearance 130 from an existing side (for example, a wrap part 3 side) while compacting the concrete with the bar-like vibrator 1, and the bar-like vibrator 1 is moved along the guide rail 2 from the existing side to an end sheathing 4 side while placing the concrete. The guide rail 2 works as a setup beam for the secondary lining concrete 100.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for placing secondary lining concrete, and more particularly, to a method for placing a tunnel top end securely and easily.

[0002]

2. Description of the Related Art When a tunnel is constructed by a shield method, a secondary lining of concrete is applied to the inner periphery of a segment. In this case, a center (steel form) is provided on the inner periphery of the shield, and concrete is poured into a gap between the center and the segment.

[0003]

In order to cast concrete precisely, it is necessary to compact the concrete, that is, to apply vibration to the poured fresh concrete. The compaction of the tunnel side wall and the like can be performed by inserting a vibrator between the segment and the center from the inspection window. However, it is difficult to compact the top end of the tunnel and both shoulders by the same method because of the complicated reinforcement. In particular, compaction could not be performed on the back of the reinforcing bar because the vibrator did not reach it. Further, as a conventional example of the method of compacting the top end of the tunnel, there is, for example, a method disclosed in JP-A-7-48994. However, this method is a method in which compaction is performed only by the pressing force due to the reciprocating motion of the movable plate without using a vibrator such as a vibrator, and therefore, it is difficult to perform compaction sufficiently. In particular, it was difficult to compact the rear part of the rebar.

[0004] That is, conventionally, it has been difficult to sufficiently compact the top end of the tunnel in placing the secondary lining concrete. An object of the present invention is to make it possible to easily and sufficiently compact secondary lining concrete even at the top end of a tunnel or both shoulders.

[0005]

Means for Solving the Problems In order to solve the above problems, the invention according to claim 1 is directed to a secondary lining concrete (1).
00), wherein a guiding means (for example, guide rail 2) in a tunnel extending direction is provided in a gap (130) between a segment (120) and a formwork (for example, centure 110).
And vibration generating means (for example, a rod-shaped vibrator 1) that moves along the guide means, and concrete is compacted into the gap from an existing side (for example, the lap portion 3 side) while being compacted by the vibration generating means. With the filling of the concrete, the vibration generating means is moved from the existing side toward the end plate (4) along the guide means.

According to the first aspect of the present invention, since the vibration of the vibration generating means is directly transmitted to the concrete, the concrete can be compacted efficiently and sufficiently. In addition, the vibration generating means moves from the existing side to the end plate side with the filling of the concrete, while compacting 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 eventually is reliably pulled out from the end plate side. That is, by applying the present method to the top end of the tunnel or both shoulders, the concrete can be compacted easily and reliably at the top end of the tunnel or both shoulders. In particular, since the vibration generating means can be easily arranged on the back surface of the reinforcing bar, the compaction of the back surface of the reinforcing bar can be reliably performed.

According to a second aspect of the present invention, in the method for placing secondary lining concrete according to the first aspect, the guide means is a rail-shaped member (for example, a guide rail 2). The feature is that it also doubles as the setup rebar of the next lining concrete. According to the second aspect of the present invention, the cost can be reduced because the rail-shaped member serving as the guide means also serves as the setup rebar.

According to a third aspect of the present invention, in the method for placing secondary lining concrete according to the first or second aspect, the connection line (11) extending from the vibration generating means is covered with a flexible hose (12). It is characterized by being drawn from the open end of the bobble plate side. According to the third aspect of the present invention, since the connection line is covered with the flexible hose, it is possible to reduce the size of the connection line by winding or bundling the pulled-out portion. Therefore, the working space for pulling out can be reduced. Here, the connection line includes a line such as a power cable or a signal line that electrically connects the vibration generating unit to the outside.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A method for placing secondary lining concrete 100 at the top of a tunnel according to an embodiment of the present invention will be described below with reference to the drawings. As shown in FIG. 1, the method includes a rod-shaped vibrator 1 installed in a gap 130 between a center 110 (mold) and a segment 120.
And a method using the guide rail 2.

The rod-shaped vibrator 1 has a well-known rod-shaped vibrator body (not shown) and a connection line 11 thereof housed in a flexible hose 12, and extends from the end plate 4 (end end on the end plate side) to the wrap portion 3 (existing side). And is slidably mounted on the guide rail 2. Here, the rod-shaped vibrator main body can be inserted to the wrap portion 3 of the gap 130, that is, the deepest portion. Also, connection line 1
1 includes a power cable, a signal line, and the like. The connection wire 11 and the flexible hose 12 can be wound up.

As shown in FIGS. 1 and 2, the guide rail 2 is formed by suspending and fixing an angle having a substantially L-shaped cross section from the setup bar attaching portion 121 of the segment 120 using the bracket 5 in a concave direction. And is provided in the gap 130 in the tunnel extending direction. That is, the guide rail 2 is a member that slidably mounts the bar-shaped vibrator 1 and guides it in the tunnel extending direction. Here, the guide rail 2 also serves as a setup line of the secondary lining concrete 100. That is, the reinforcing bar 100a of the secondary lining concrete 100
Is assembled into the guide rail 2 to be built into a predetermined shape.

As shown in FIG. 3, the bracket 5 has a structure in which a bolt hole 5a is provided at an upper portion of a substantially rectangular steel plate and a guide rail holding opening 5b is provided at a lower portion. That is, by using the bolt hole 5a, the bolt and the nut,
The guide rail 2 is inserted into the guide rail holding opening 5b and is held by being assembled to the setup line attaching portion 121.

Using the above-described rod-shaped vibrator 1 and guide rail 2, the top end of the secondary lining concrete 100 is cast in the following steps. That is, as shown in FIG. 2, of the inspection windows 111 (also serving as concrete input ports) provided in a row in the tunnel extending direction at the top end of the center 110, the inspection window 111 located closest to the wrap portion 3 is used. Then, the fresh concrete 100b is poured into the gap 130, and the concrete is cast into the gap 13 from the lap portion 3 side. At this time, the rod-shaped vibrator 1 is arranged at the deepest part of the cavity 130 and is activated to directly apply vibration to the poured fresh concrete 100b to compact it.

Then, fresh concrete 100b
The rod-shaped vibrator 1 is pulled from the base plate 4 and moved to the base plate 4 side as the concrete filling portion in the gap 130 spreads toward the base plate 4 as the injection of water proceeds. That is, by moving the bar-shaped vibrator 1 in accordance with the progress of the concrete filling portion, the entire concrete filling completed portion is compacted. At this time, since compaction is performed by directly applying vibration to the fresh concrete 100b, compaction can be performed reliably.

Here, a portion of the connection wire 11 and the flexible hose 12 which is drawn out from the end plate 4 is wound up and held by a winding device or the like. Therefore, wife board 4
It is not necessary to secure a large working space at the front of the vehicle or to prepare a special drawing device.

Therefore, according to the present embodiment, the secondary lining concrete 100 can be compacted easily and reliably even at the top end of the tunnel. In particular, bar-shaped vibrator 1
In addition, since the guide rail 2 is located on the back surface (the side of the segment 120) of the reinforcing bar 100a, compaction of the back surface can also be performed reliably. Further, since the guide rail 2 also serves as a setup line of the secondary lining concrete 100, the cost can be reduced.

The present invention is not limited to the present embodiment, but may be applied to concrete casting of a portion (for example, both shoulders) outside the top end portion of the secondary lining concrete. Also, the shape and configuration of the guide rail 2 may be any shape and configuration that can guide the rod-shaped vibrator from the wrap portion 3 to the end plate 4. In addition, it is a matter of course that the specific configuration of each part can be appropriately changed.

[0018]

According to the first aspect of the present invention, concrete can be compacted easily and reliably even at the top end of the tunnel or at both shoulders. In particular, since the vibration generating means can be easily arranged on the back surface of the reinforcing bar, compaction of the back surface of the reinforcing bar can be reliably performed.

According to the second aspect of the present invention, since the rail-shaped member serving as the guide means also serves as the setup rebar, the cost can be reduced. According to the third aspect of the present invention, since the connection wire can be reduced by winding or bundling the pulled-out portion, the working space for pulling-out can be reduced.

[Brief description of the drawings]

FIG. 1 is a schematic longitudinal 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 part of the tunnel shown in FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bar-shaped vibrator (vibration generating means) 2 Guide rail (rail-shaped member) 3 Lapping part 4 Wife plate 11 Connection line 12 Flexible hose 100 Secondary lining concrete 110 Centr (Form) 120 Segment 130 Void

 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Kumeji Sato 1-20-10 Toranomon, Minato-ku, Tokyo Nishimatsu Construction Co., Ltd. (72) Inventor Shoichi Maeda 1-20-10 Toranomon, Minato-ku, Tokyo Nishimatsu Construction Co., Ltd. F-term (reference) 2D055 BA01 CA03 DA00 KC06 LA14

Claims (3)

[Claims] 1. A tunnel extending direction guiding means and a vibration generating means moving along the guiding means are installed in a gap between a segment and a formwork, and concrete is filled in the gap from the existing side by the vibration generating means. And placing the compacted concrete and moving the vibration generating means from the existing side to the end plate side along the guide means along with the filling of the concrete. 2. The method according to claim 1, wherein said guide means is a rail-shaped member, and said rail-shaped member also serves as a setup reinforcing bar for the secondary lining concrete. . 3. The method according to claim 1, wherein the connecting line extending from the vibration generating means is covered with a flexible hose and drawn out from the open end of the end plate.