JP2001227292A - Reinforcement fixing mechanism in tunnel and construction method for assembling reinforcement - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reinforcement fixing mechanism and a construction method for assembling reinforcement for fixing reinforcements for a lined concrete in a tunnel without impairing the function of a water-proof sheet. SOLUTION: This reinforcement fixing mechanism 1 is mainly composed of a single steel pipe 2, a thin plate supporting member 3 mounted on the single pipe 2 at its one end, a thin plate rotary member 4 rotatably attached to the approximately central part of the supporting member 3 at its one end, and a thin plate reinforcement binding member 5 slidably assembled in the other ends of the supporting member 3 and the rotary member 4 at their end parts. The single pipe 2 is fixed outside of an installation area of the water-proof sheet 120, the supporting member 3 is directed to an inner peripheral side of the water-proof sheet 120, and the reinforcements are bound to the reinforcement binding member 5. Whereby the reinforcements 100 of the reinforced concrete can be assembled in the inner peripheral side of the water-proof sheet 120 without directly contacting with the water-proof sheet.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reinforcing bar fixing mechanism for positioning and fixing a reinforcing bar of reinforced concrete placed in a tunnel via a waterproof sheet, and a reinforcing bar incorporating method using the same.

[0002]

2. Description of the Related Art In order to ensure waterproofness of a tunnel, a part of sprayed concrete (for example, a lower peripheral portion) may be covered with a waterproof sheet and then reinforced concrete may be constructed. Completely waterproof tunnel (NAT)
In M), the positioning of the reinforced concrete reinforcing bar 100 has been conventionally performed using a driving anchor and an anchor bar.

[0003] That is, as illustrated in the enlarged views of FIGS. 3 and 4, a driving anchor 110 is driven from the waterproof sheet 120 and the sprayed concrete 130 to the ground 140, and an anchor bar 111 is attached to the anchor 110 with a nut 112. To fix it in a state protruding toward the inner peripheral side. Then, the circumferential reinforcing bar 1 is attached to the anchor bar 111.
00 was bound and fixed, and its positioning was performed.

[0004]

In the above-mentioned conventional method, holes 121 are formed in the waterproof sheet 120 when the anchor 110 is driven into the waterproof sheet 120, and the function of the waterproof sheet 120 is impaired. As a countermeasure for this, as shown in FIG.
Was sealed with a butyl rubber packing 122 and pressed against the waterproof sheet 120 with a nut 112. Further, Japanese Patent Application Laid-Open
As described in JP-A-303594, a method of welding a resin to the hole 121 is also available. However, this repair method was troublesome and costly. Also, butyl rubber packing 1
In 22, there is a possibility that water leaks without completely closing the hole 121, so that inspection and maintenance costs as a waterproof measure are required even after the tunnel is opened.

[0005] It is an object of the present invention to solve the above-mentioned problem by fixing a reinforcing steel bar of lining concrete in a tunnel without impairing the function of the waterproof sheet.

[0006]

In order to solve the above-mentioned problems, the invention according to claim 1 is directed to a reinforced concrete reinforcing bar (100) on the inner peripheral side of a waterproof sheet (120) laid on a part of a tunnel. Rebar fixing mechanism for positioning and fixing the rod (1)
A fixing portion (for example, a single pipe 2) fixed to the inner wall of the tunnel other than the waterproof sheet laying area,
There is provided a reinforcing bar binding portion (for example, the support member 3 and the reinforcing bar binding member 5) extending from the fixing portion toward the waterproof sheet and binding and fixing the reinforcing bars.

According to the first aspect of the present invention, the reinforcing bar binding portion is fixed to the inner wall of the tunnel by the fixing portion. The reinforcing bar is bound and fixed to the reinforcing bar binding portion. Therefore, the rebar
It is positioned and fixed by the rebar fixing mechanism. Further, since the fixing portion is fixed to an area other than the area where the waterproof sheet is laid, there is no physical effect such as making a hole in the waterproof sheet. Therefore, according to the first aspect of the present invention, it is possible to provide a reinforcing bar fixing mechanism for fixing the reinforcing steel of the lining concrete in the tunnel without impairing the function of the waterproof sheet.

According to a second aspect of the present invention, in the rebar fixing mechanism according to the first aspect, a rod-shaped member (for example, a single pipe 2) fixed to the inner wall along a direction in which the tunnel extends is provided as a fixing portion, and a reinforcing bar binding. Mounting means (for example, a hook 31) for attaching a portion to an arbitrary portion of the rod-shaped member.

According to the second aspect of the present invention, since the reinforcing bar binding portion can be attached to an arbitrary portion of the rod-shaped member via the attaching means, the attaching position of the reinforcing bar binding portion in the extending direction of the tunnel can be freely set. Can be adjusted. here,
The rod-shaped member is not limited to a pipe, and may be any member having sufficient strength to support a reinforcing bar. Further, as the attaching means, a mechanism for fastening and fixing the attaching means to the rod-shaped member using a bolt or a nut other than the hook may be used.

[0010] The third aspect of the present invention is the first or second aspect.
In the reinforcing bar fixing mechanism described above, the reinforcing bar binding portion includes a supporting member (3) extending from the fixing portion toward the waterproof sheet, a rotating member (4) rotatably incorporated in the supporting member, and the supporting member. And a rebar binding member (5) erected on the member and the rotating member and slidably attached to both members.

According to the third aspect of the present invention, the reinforcing bar binding member is moved by sliding along the rotating member and the supporting member while rotating the rotating member. Therefore, according to the third aspect of the present invention, the binding / fixing position of the reinforcing bar can be adjusted in the tunnel sectional direction.

The invention according to claim 4 is the invention according to claim 2 or 3.
It is a construction method of incorporating a rebar using the rebar fixing mechanism described, wherein the rod-shaped member, in a region other than the waterproof sheet laying region in the tunnel, is fixed along the extending direction of the tunnel, using attaching means, A reinforcing bar binding portion is attached to a predetermined portion of the rod member, and a reinforcing bar is positioned and fixed to the reinforcing bar binding portion.

According to the fourth aspect of the present invention, a reinforcing bar can be incorporated using the reinforcing bar fixing mechanism according to the second or third aspect.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A rebar fixing mechanism 1 according to an embodiment of the present invention will be described below in detail with reference to the drawings.
As shown in FIG. 1, the rebar fixing mechanism 1 is made of steel, and has a steel single pipe 2 fixed along the tunnel inner wall in a direction in which the tunnel extends, and one end attached to the single pipe 2. A thin plate-shaped support member 3, a thin plate-shaped rotary member 4 having one end rotatably assembled near the center of the support member 3, and respective end portions at the other ends of the support member 3 and the rotary member 4. And a thin plate-shaped reinforcing bar binding member 5 each of which is slidably incorporated.

The support member 3 is provided at one end with a hook 31 for facilitating attachment to the single pipe 2 and at the other end with a slot 32 in the direction of extension. Also, the support member 3
Is provided with a hole 33 near the center for inserting and holding the rotating shaft 41.

The rotating member 4 has a hole 42 for inserting and holding a rotating shaft 41 at one end, and a long hole 43 in the extending direction at the other end.
Is provided. That is, the rotating shaft 41 is connected to the hole 42 and the hole 33.
Is inserted into the supporting member 3 so as to be freely rotatable.

The reinforcing bar binding member 5 has a hole 52 for inserting a bolt 51 at one end, and a long hole 53 in the extending direction at the other end. That is, the reinforcing bar binding member 5 is
1 is inserted into one of the long hole 32 and the long hole 43 through the hole 52 and tightened and fixed with a nut (not shown) from the opposite side, and the other is inserted into the other of the long hole 32 and the long hole 43. 53
Are overlapped, and the bolt 54 is inserted into both long holes and fastened and fixed from the opposite side with a nut (not shown), so that the bolt 54 is slidably incorporated into the support member 3 and the rotating member 4.

Next, a method of incorporating the reinforcing bar 100 of reinforced concrete for tunnel lining using the reinforcing bar fixing mechanism 1 will be described with reference to FIG. First, after the sprayed concrete 130 is constructed, a part of the sprayed concrete 130 (the lower part of the tunnel in FIG. 2) is covered with the waterproof sheet 120. The horizontal angle 6 is fixed to at least two places in the tunnel extending direction by welding to a shoring (not shown) located at a portion (not shown in FIG. 2) which is not covered with the waterproof sheet 12O. Each of the single pipes 2 is fixed in the tunnel extending direction.

The supporting member 3, the rotating member 4, and the reinforcing bar binding member 5, which have been assembled in advance, are provided at predetermined positions of the individual pipes 2.
Is attached with a hook 31. Then, the position of the reinforcing bar binding member 5 is determined by measuring the position of the reinforcing bar binding member 5 by moving the bolts 51 and 54 along the long holes 32, 43 and 53 to rotate the rotating member 4. 2). At this time, preferably, the reinforcing bar binding member 5 is made horizontal. In addition, marking is performed on the reinforcing bar binding member 5. Further, a cushioning material 7 is attached to an end of the reinforcing bar binding member 5 on the side of the waterproof sheet 120 in order to prevent the reinforcing bar binding member 5 from damaging the waterproof sheet 120.

Then, each end of the reinforcing bar 100 in the circumferential direction of the tunnel is bound by using the above-described marking as a mark on each reinforcing bar binding member 5, whereby the reinforcing bar 100 is positioned and fixed on the waterproof sheet 120. Then, the reinforcing bar 100 in the tunnel extending direction is bound to the reinforcing bar 100 in the circumferential direction of the tunnel, and the assembling of the reinforcing bar ends.

Therefore, according to the reinforcing bar fixing mechanism 1, since the waterproofing sheet 120 is not directly in contact with the waterproofing sheet 120, the reinforcing sheet 100 of the reinforced concrete is incorporated on the inner peripheral side of the waterproofing sheet 120 without damaging the waterproofing sheet 120 with holes or the like. be able to. In addition, since the support member 3, the rotating member 4, and the reinforcing bar binding member 5 assembled in advance are attached to the single pipe 2 with the hook 31, the tunnel extending of the reinforcing bar binding member 5 can be performed even during the binding operation of the reinforcing bar 100, for example. The position in the direction can be easily adjusted. Further, since the fastening position of the reinforcing bar 100 is measured based on the reinforcing bar binding member 5, the measurement time can be shortened. Further, even when the waterproof sheet 120 is thick, the reinforcing bar 100 can be easily incorporated, unlike the case where the driving anchor is used.

In the above embodiment, the supporting member 3, the rotating member 4,
Although the reinforcing bar binding member 5 is attached by the hook 31, the present invention is not limited to this, and the support member 3, the rotating member 4, and the reinforcing bar binding member 5 are directly connected to the horizontal angle 6.
Or it may be fixed by welding to the support. Further, instead of the hook 31, a configuration may be adopted in which the support member 3 is fastened and fixed to the single pipe 2 using a nut / bolt. Moreover,
L instead of the supporting member 3, the rotating member 4, and the reinforcing bar binding member 5
It is a matter of course that the vertical side portion can be used as a fixing portion and the bottom side portion can be used as a reinforcing bar binding portion using a fixed metal fitting of a letter shape, and the like can be appropriately changed.

[0023]

According to the first aspect of the present invention, it is possible to provide a reinforcing bar fixing mechanism for fixing a reinforcing steel bar of lining concrete in a tunnel without impairing the function of the waterproof sheet.

According to the second aspect of the present invention, it is possible to freely adjust the mounting position of the reinforcing bar binding portion in the extending direction of the tunnel. According to the third aspect of the invention, it is possible to adjust the binding / fixing position of the reinforcing bar in the circumferential direction. According to the fourth aspect of the present invention, a reinforcing bar can be incorporated using the reinforcing bar fixing mechanism according to the second or third aspect.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a reinforcing bar fixing mechanism according to an embodiment to which the present invention is applied.

FIG. 2 is an enlarged sectional view showing an example of use of the reinforcing bar fixing mechanism of FIG.

FIG. 3 is an enlarged cross-sectional view of a tunnel illustrating a conventional example.

FIG. 4 is a diagram showing a configuration of a driving anchor and an anchor rebar used in a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rebar fixing mechanism 2 Single pipe (bar-shaped member) 3 Support member 4 Rotating member 5 Rebar binding member

Claims (4)

[Claims] 1. A reinforcing bar fixing mechanism for positioning and fixing a reinforcing bar of reinforced concrete on an inner peripheral side of a waterproof sheet laid on a part of a tunnel, wherein the reinforcing bar is fixed to an inner wall of the tunnel other than an area where the waterproof sheet is laid. A fixing portion extending from the fixing portion toward the waterproof sheet and binding and fixing a reinforcing bar. 2. A fixing device comprising: a rod-shaped member fixed to an inner wall along a direction in which a tunnel extends; and mounting means for attaching a reinforcing bar binding portion to an arbitrary portion of the rod-shaped member. Item 7. A reinforcing bar fixing mechanism in a tunnel according to Item 1. A reinforcing member extending from the fixing portion toward the waterproof sheet; a rotating member rotatably incorporated in the supporting member; and a bridging member extending between the supporting member and the rotating member. The reinforcing bar fixing mechanism in the tunnel according to claim 1 or 2, further comprising: a reinforcing bar binding member slidably attached to both members. 4. A method of incorporating a reinforcing bar using a reinforcing bar fixing mechanism in a tunnel according to claim 2 or 3, wherein a rod-shaped member is placed in a region other than a waterproof sheet laying region of the tunnel in the ground. A method of assembling a reinforcing bar in a tunnel, comprising fixing a reinforcing bar binding portion to a predetermined portion of the rod member using an attaching means after fixing along a stretching direction, and positioning and fixing a reinforcing bar at the reinforcing bar binding portion.