JP2005002730A - Concrete compaction method and device for tunnel zenith section - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To form a high quality concrete surface for the tunnel zenith section by simplifying its arrangement working and eliminating members for guiding a vibrator and efficiently transmitting the vibration of the vibrator to the surface of a form. <P>SOLUTION: The vibrator 15 is constituted with a long frame 16 long in the peripheral direction of the tunnel and vibration generators 17 at both the ends, and a plurality of wheels 19 are provided on a frame 16. The vibrator 15 is installed on the form 4b through an inspection window 8 at the tunnel zenith section. The vibrator 15 is pulled in a direction of a tunnel shaft line through a wire rope by an electrically operated winch 27. A cable holding device is attached to a form 4b at the side of the winch 27 by the vibrator 15, and a feeder cable of the vibration generator 17 is retained. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method and an apparatus for compacting concrete filled in a placement space at a tunnel zenith.
[0002]
[Prior art]
In Patent Document 1, a concrete placement space is formed at the top of the tunnel using a mold, a guide member such as a reinforcing bar or steel wire is stretched in the placement space, and a vibrator is suspended from the guide member. A method is described in which a power feeding cable of a vibrator is wound around a cable reel, the vibrator is pulled toward the face, and the concrete filled in the placement space is compacted by the vibrator.
[0003]
[Patent Document 1]
Japanese Patent Application Laid-Open No. 2003-3795
[Problems to be solved by the invention]
However, according to the conventional compaction method, it is necessary to stretch the guide member on the zenith portion prior to the mold frame process, and there is a problem that the setup work becomes complicated. Further, since the vibrator is pulled while being suspended from the guide member, the vibration of the vibrator is not sufficiently transmitted to the concrete on the surface of the formwork, and there is a problem that the quality of the concrete surface exposed to the ceiling of the tunnel is deteriorated.
[0005]
The object of the present invention is to solve the above-mentioned problems, omit the guide member of the vibrator, simplify the setup work, efficiently transmit the vibration of the vibrator to the concrete on the surface of the formwork, and provide a high quality concrete surface at the zenith. It is an object of the present invention to provide a concrete compaction method and apparatus for a tunnel zenith that can be formed into a compact.
[0006]
[Means for Solving the Problems]
In order to solve the above-described problems, the compacting method of the present invention is to pull a vibrator equipped with wheels on a formwork provided at the top of the tunnel in a tunnel axial direction through a cord-like member by a traction means. The concrete filled in the placement space at the zenith is compacted with a vibrator.
[0007]
Further, the compacting device of the present invention includes a vibrator having wheels that roll on a formwork provided at the top of a tunnel, a cord-like member connected to the vibrator, and a vibrator via the cord-like member. It is characterized by comprising traction means for traction in the tunnel axis direction.
[0008]
Here, the towing direction of the vibrator is normally from the tunnel entrance side to the face side, but it may be in the reverse direction or may be reciprocated in both directions. As the rope-shaped member, a wire rope, a chain, a belt, a synthetic or natural fiber rope, or the like can be used. As the traction means, an electric winch, a manual winding winch, a hydraulic winch, a hydraulic cylinder, or the like can be used.
[0009]
The vibrator is not limited to a specific shape, and for example, a vibrator having a rod shape, a lattice shape, or a flat plate shape can be used. However, a shape that is long in the circumferential direction of the tunnel is preferable in that the concrete filled in the placement space at the zenith can be vibrated efficiently. Specifically, the vibrator may include a frame extending in the tunnel circumferential direction, and a plurality of vibration generators and a plurality of wheels may be provided on the frame.
[0010]
In this case, it is desirable that the frame is configured to be foldable in a plane parallel to the mold so that the vibrator can be easily put into and out of the placement space through the inspection window of the mold at the zenith. Moreover, it is good to attach the cable holder which hold | maintains a power feeding cable to the formwork of the pulling means side from a vibrator so that the power feeding cable of a vibration generator may not be poured with concrete.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the tunnel of this embodiment, as shown in FIG. 1, supporting concrete 2 is constructed on a ground excavation surface 1 by a spraying method, and lining concrete 3 is constructed on the supporting concrete 2 by a formwork method. A mold 4 for molding the lining concrete 3 is assembled on a self-propelled carriage 5 in a cylindrical shape via a frame 6, and an inspection window 8 having a door 7 is provided in each part of the mold 4.
[0012]
The formwork 4a provided on the side wall portion of the tunnel forms a side wall placement space 10 between the supporting concrete 2 and the concrete poured into the placement space 10 from the inspection window 8 side of the lining concrete 3 A board portion 3a is placed. The formwork 4b provided at the zenith of the tunnel forms a zenith placement space 11 between the support concrete 2 and is covered by the concrete poured into the placement space 11 from the inlet 12 of the door 7. A top 3b of the engineered concrete 3 is placed. In addition, as shown in FIG. 4, two injection ports 12 are provided at the well-portion side end portion and the intermediate portion of the placement space 11.
[0013]
As shown in FIGS. 2 and 3, the device for compacting the concrete filled in the zenith placement space 11 includes a vibrator 15 on the formwork 4 b at the zenith. The vibrator 15 includes a frame 16 that extends long in the circumferential direction of the tunnel, and a pair of vibration generators 17 that incorporate a motor and a vibrator (not shown). The vibration generator 17 is attached to both end fastening portions 16 a of the frame 16 so as to protrude in the extending direction of the frame 17.
[0014]
The frame 16 is configured to be foldable in a cylindrical surface parallel to the mold 4b by connecting two steel pipes with a pivot 18. The frame 16 has three wheels 19 that roll on the mold 4b, a pair of traction brackets 21 to which two wire ropes 20 (cord-like members) are connected, and a power supply cable that extends from the vibration generator 17. A pair of cable outlets 23 (using elbows) for taking out 22 out of the frame 16 are provided.
[0015]
On the other hand, as shown in FIGS. 4 and 5, a working scaffold 25 is provided at the end of the face of the self-propelled carriage 5, and two electric winches 27 (traction means) are provided on the working scaffold 25 via a stand 26. Is installed. The wire rope 20 is wound around the drum 27a of the electric winch 27, and the vibrator 15 is moved through the wire rope 20 by the rotation of the drum 27a from the wellhead side (left side in FIG. 4) to the face side (right side in FIG. 4). Towed.
[0016]
A pair of two cable holders 29 are provided on the mold 4 b closer to the electric winch 25 than the vibrator 15. As shown in FIGS. 2 and 3, the cable holder 29 is formed by bending a steel rod, the base end is attached to the window frame 8 a of the inspection window 8 with bolts 30, and a plurality of hooks 31 are attached to the straight portion on the distal end side. Is fixed. The power supply cable 22 of the vibration generator 17 is supported by the hook 31 and is held in the upper portion of the zenith portion placing space 11 in the vicinity of the vibrator 15.
[0017]
In this embodiment, the wire rope 20 and the power supply cable 22 are bundled at equal pitches by the bundling fitting 32 and held by the cable holder 29. At the end of the top of the zenith placement space 11 is a wife form frame 33 (see FIG. 4), and the wife form frame 33 is provided with a through hole (not shown) for the wire rope 20 and the feeding cable 22. . The bundling metal fitting 32 is removed from the outside of the end form frame 33, and the power supply cable 22 is separated from the wire rope 20 in front of the electric winch 27.
[0018]
Next, a method for compacting the concrete filled in the zenith portion placing space 11 will be described. The lining concrete 3 has a span (for example, about 10 m) according to the length of the self-propelled carriage 5, and after the left and right side panel portions 3a are driven, the top panel portion 3b is driven. In placing the top panel 3b, as shown in FIGS. 4 and 5, the vibrator 15 and the cable holder 29 are installed in the zenith placing space 11, and the wire rope 20 and the feeding cable 22 are wired. The
[0019]
In this case, the vibrator 15 folds the frame 16 (see FIG. 3), inserts it from the inspection window 8 on the wellhead side, and then deploys on the mold 4b. In this way, even after the mold is assembled, the long vibrator 15 can be easily installed on the mold 4b at the zenith. The cable holder 29 is inserted from the inspection window 8 on the face side with respect to the vibrator 15, the base end is attached to the window frame 8 a, and the wire rope 20 and the feeding cable 22 are held on the hook 31 on the distal end side. In addition, when assembling the formwork 4b of the zenith part, you may insert the vibrator 15 from the connection part of the formwork 4b and the laid top board part 3b previously.
[0020]
The concrete that forms the top part 3b is first injected into the placement space 11 from the inlet 12 on the wellhead side. The poured concrete is filled into the placement space 11 in a form that gradually rises from the face side to the wellhead side as indicated by a chain line C in FIG. In this state, the vibration generator 17 and the electric winch 27 are activated, and the vibrator 15 is pulled to the face side via the wire rope 20 by the electric winch 27 while compacting the concrete with the vibrator 15. At this time, no tension acts on the power supply cable 22.
[0021]
The electric winch 27 may be driven continuously or intermittently. In either case, the vibrator 15 is guided to the wire rope 20 and moves in a straight line by rolling the wheel 19 on the mold 4b. For this reason, unlike the conventional case, a guide member for guiding the vibrator 15 is not required, and the setup work for installing the guide member before the mold frame process can be omitted, and the guide member is wasted. Also disappear.
[0022]
The vibration of the vibration generator 17 propagates to the three wheels 19 through the frame 16. The pair of vibration generators 17 vibrate the concrete below the placement space 11, and the frame 16 vibrates the top concrete. Accordingly, concrete can be efficiently and uniformly compacted at each part in the circumferential direction of the tunnel by the single vibrator 15, and the concrete surface exposed to the ceiling of the tunnel can be made beautiful by vibration propagation from the wheel 19 to the mold 4b. Can be molded.
[0023]
As the vibrator 15 advances to the face side, the cable holder 29 is sequentially fed to the face side inspection window 8 and reattached, and the power supply cable 22 and the wire rope 20 are always held in the vicinity of the vibrator 15. By doing so, there is no possibility that the cable 22 and the wire rope 20 will be poured into the concrete and buried, and in particular, disconnection of the cable 22 can be prevented. After that, concrete is filled from the intermediate injection port 12 and compacted in the same manner, and after placing the entire length of the top part 3b, the vibrator 15 is moved from the inspection window 8 on the most face side or one of the wife molds 33. Take out from the door outlet (not shown) provided in the section.
[0024]
6, 7 and 8 show another embodiment of the compaction device. The compacting device includes the pin 41 for temporarily mooring the vibrator 15 on the mold 4b, and the power cable 22 is held by the pin-shaped cable holder 51. It is different from the device. As shown in FIGS. 6 and 7, the mooring pin 41 and the pin-shaped cable holder 51 are formed on the electric winch 27 side of the vibrator 15 at a position before the inlet 12 on the wellhead side and an appropriate position on the face side. It is attached to 4b.
[0025]
As shown in FIG. 8A, the mooring pin 41 includes a support cylinder 42 fixed to the lower surface of the mold 4b, a locking pipe 43 inserted into the support cylinder 42, and the locking pipe 43. On the other hand, the connecting pin 44 is connected to the upper and lower stages. The locking pipe 43 is engraved with a mark line 45 that determines the lower position according to the lower end of the support cylinder 42. Then, the locking pipe 43 enters the zenith placement space 11 at the upper position, anchors the vibrator 15, exits from the placement space 11 at the lower position, releases the vibrator 15, and opens the hole 46 of the mold 4b. Is supposed to be blocked. In addition, it is also possible to use this mooring pin 41 for the compaction apparatus of the said embodiment.
[0026]
As shown in FIG. 8B, the cable holder 51 includes a support cylinder 52 fixed to the lower surface of the mold 4 b, a holding pipe 53 inserted into the support cylinder 52, and a support cylinder instead of the holding pipe 53. The stopper pipe 54 is inserted into the support pipe 52 and the connecting pipe 55 is connected to the support cylinder 52. Then, the holding pipe 53 is attached to the support cylinder 52 on the electric winch 27 side from the vibrator 15, the feeding cable 22 is held in the recess 56 at the upper end, and the plug pipe 54 is attached to the support cylinder 52 after the vibrator 15 has passed, At its upper end, the hole 46 of the mold 4b can be closed.
[0027]
According to the compacting device of this embodiment, the vibrator 15 may fluctuate due to the concrete pressure by mooring the vibrator 15 to the mooring pin 41 under the tension of the wire rope 20 at the initial stage of concrete injection. The compaction operation can be started at an appropriate position. In addition, since the cable holder 51 is formed in a pin shape, it can be easily attached to and detached from the mold 4b as compared with the cable holder 29 of the above embodiment, and the feeding cable 22 is connected to the zenith portion placement space 11. There is an advantage that it can be securely held at a higher position.
[0028]
As shown in FIG. 7, since the cable holder 51 is located at the approximate center in the circumferential direction of the tunnel, the power supply cable 22 passes from the cable outlets 23 at both ends of the vibrator 15 through the metal fittings 57 at the center portion. 51. Unlike the embodiment, the wire rope 20 is not held by the cable holder 51 and extends to the electric winch 27 in a state separated from the power supply cable 22.
[0029]
The tightening method and apparatus of the present invention are not limited to the above-described embodiment, and may be embodied with appropriate modifications within a range not departing from the spirit of the invention, such as using a vibrator as exemplified below.
(1) The vibrator 61 shown in FIG. 9 is formed such that the frame 16 extends long in the tunnel circumferential direction and bends in a plane “<” shape.
(2) The vibrator 71 shown in FIG. 10 has a plurality of vibration generators 17 (for example, six) facing in the direction of the tunnel axis between two frames 16 that are long in the circumferential direction of the tunnel. Is formed.
(3) The vibrator 81 shown in FIG. 11 has a plurality of (for example, six) vibration generators 17 facing in the tunnel axis direction inside a thin box frame 82 that is long in the circumferential direction of the tunnel. It is formed in a shape.
[0030]
【The invention's effect】
As described above in detail, according to the compaction method and apparatus according to the present invention, the vibrator with wheels is pulled on the formwork of the tunnel zenith, so the guide member of the vibrator can be omitted and the setup work can be simplified. At the same time, the vibration of the vibrator is efficiently transmitted to the concrete on the surface of the formwork, and the concrete surface at the zenith can be molded with high quality.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a tunnel zenith showing an embodiment of the present invention.
FIG. 2 is a front view showing an apparatus for compacting concrete at a tunnel zenith.
FIG. 3 is a plan view of the compaction device.
FIG. 4 is a tunnel longitudinal sectional view showing a method for compacting concrete at the zenith.
FIG. 5 is a plan view showing the compaction method.
FIG. 6 is a tunnel longitudinal sectional view showing another embodiment of a compaction device.
FIG. 7 is a plan view of the compaction device.
FIG. 8 is a front view showing an anchor pin and a cable holder of the compaction device.
FIG. 9 is a plan view showing a modification example of a vibrator.
FIG. 10 is a two-sided view showing another modification of the vibrator.
FIG. 11 is a two-side view showing still another modification of the vibrator.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 3 Clay concrete 3a Side board part 3b Top board part 4 Formwork 4b Formwork 8 of the top part Inspection window 11 Top part placement space 12 Inlet 15 Vibrator 16 Frame 17 Vibration generator 19 Wheel 20 Wire rope 22 Feed cable 27 Electric winch 29 Cable holder 51 Cable holder 61 Vibrator 71 Vibrator 81 Vibrator 82 Frame

Claims (5)

On the formwork provided at the zenith of the tunnel, the vibrator with wheels is pulled by the traction means in the tunnel axis direction via the cord-like member, and the concrete filled in the placement space at the zenith is tightened with the vibrator. A concrete compaction method for the tunnel zenith characterized by solidification. A vibrator having wheels that roll on a formwork provided at the top of the tunnel, a cord-like member connected to the vibrator, and a traction means for pulling the vibrator in the tunnel axial direction via the cord-like member; A concrete compaction device for the tunnel zenith, characterized by comprising: The concrete compaction device for a tunnel zenith according to claim 2, wherein the vibrator includes a frame extending in the circumferential direction of the tunnel, and the frame is provided with a plurality of vibration generators and a plurality of wheels. The concrete compaction device for a tunnel zenith according to claim 3, wherein the frame is configured to be foldable in a plane parallel to the formwork. The concrete compaction device for a tunnel zenith according to claim 3 or 4, wherein a cable holder for holding a power supply cable of a vibration generator is attached to the formwork closer to the traction means than the vibrator.

Images