JPS6315434Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a formwork strut device for a tunnel side wall that is constructed so as not to obstruct the passage of vehicles and the like.

Various tunnel excavation methods are known. For example, as shown in FIGS. 1 and 2, an arch portion 1 of the tunnel is excavated, arch concrete 2 is poured, and then a large back portion 3 is excavated. Finally, side wall sections 4 and 5 are excavated, and side wall 5 of the excavated section is
The method of pouring concrete is widely practiced.

When using this construction method, the side wall part is attached to the arch concrete joint part (approximately 3.0 m).
A flat earthen excavation is carried out over 1 meter (approximately 10.5 m), and side wall formwork is set in this excavated area using a beam cutting device, and concrete is poured alternately on both sides. The present invention relates to a strut device for supporting such a formwork, and specifically relates to a strut device 20 for supporting a formwork 10 erected on a side wall 5, as shown in FIG.

By the way, as is clear from the above explanation, since the side wall formwork 10 is set on the opposite side walls of the tunnel, the strut device is used for tunnel excavation work, that is, for transportation of trolleys, concrete pumping trucks, or workers. It must be placed so that it does not get in the way. Furthermore, once the poured concrete has finished curing, the formwork is removed and moved to the next excavated area, so it is required to be easy to assemble and disassemble. And to meet these demands,
Conventionally, methods such as a gantry type, a lock bolt method, a trunk type, a two-stroke method, and a method of cutting beams from nearby rocks have been proposed. However, these methods have advantages and disadvantages,
The most effective strut device was desired. In other words, it is desirable to have a strut device that does not interfere with the work associated with tunnel excavation, is easy to set up and move, and does not interfere with the curing of poured concrete when vehicles pass through the tunnel. It was rare. The present invention was developed under these circumstances, and the above requirements are met by a frame body placed on the floor of the tunnel, and a frame body that is pivotally connected to the side wall formwork. This is achieved by constructing a strut device from an elongated member, and providing a lining plate and a steel plate so that they do not come into contact with the strut device.

An embodiment of the present invention will be described below with reference to FIGS. 3 to 5.

The formwork 10 for the tunnel side wall is of a known type, and as shown in FIGS. 3 and 4, a reinforcing frame 1 is used.
1 and a face plate 12 attached thereto. A concrete pumping port 13 is formed at a proper location on the face plate 12. The upper part of this formwork 10 may be supported, for example, by driving anchor bolts into the arch concrete 2 that has already been cast.
Alternatively, anchor bolts can be driven into the rock and positioned and supported using separators.

The strut device 20 will be described in detail with reference to FIGS. 4 and 5, but as schematically shown in FIG. 3, it includes a frame 30 placed on the floor surface 5 of the tunnel,
It is comprised of an elongated member 40 provided between the frame and the reinforcing frame 11. The frame is provided with a lining plate and an iron plate so as not to come into contact with the frame.

As shown in FIG. 4, the frame body 30 is made of, for example, H-shaped steel (H200×200×8×12) in the shape of a parallel cross. In other words, it is constructed in a cross-shaped structure from a pair of vertical members 31, 31 and a pair of horizontal members 32, 32, and a camber (sled plate) 3 is provided on the lower surface of the horizontal members 32, 32.
3 and 33 are provided so that the height from the tunnel floor surface 5 can be adjusted.

The elongated member 40 may be a turnbuckle,
It may also be a piston-cylinder unit type operated by hydraulic pressure, but a turnbuckle type is shown in FIG. One end 41, 41... is pivotally mounted 42, 42... to the reinforcing frame 11 of the formwork 10, and the other end 43, 43... is pivotally mounted 44, 44... to the horizontal member 32 of the frame 30. has been done.

The lining board 50 is provided inside the frame body 30 configured in a cross-shaped cross-section, and is provided so as not to come into contact with the frame body 30. Therefore, the members 51, 51 supporting the plate 50 are made of H-beam steel (for example, H350 x 350 x 10-16) larger than the vertical frame 31, and the members 51, 51 are welded or the like as shown in FIG. It is twisted and fixed. Further, on both outer sides of the members 51, 51, that is, on both outer sides where the lining plate 50 is not provided, supporting members 52, 5 are constructed by cutting off one flange part of, for example, 200 x 90 x 8 channel steel.
2 is welded, and one end of the steel plates 60, 60 is supported on this member by welding or mere installation. Although the vertical member 31 of the frame body 30 is thus provided in the space between the members 51, 51, the lining board 50 and the paving iron plate 60 do not come into contact with the frame body 30. Note that reinforcing members 61, 61 are provided on both side edges of the iron plate 60. Further, if necessary, members 62, 62 for connecting the reinforcing members 61, 61 are also provided.

Since the present invention is configured as described above,
To explain how to use it, the form 10 of the concrete side wall and the strut device 20 are set in the excavated portion of the side wall. In this case, the extension member 4
0 is pivotally attached to the reinforcing frame 11 of the frame 10 and the horizontal member 32 of the frame body 30, so its angle can be bent arbitrarily. Therefore, the frame 30 is placed horizontally on the tunnel floor 5, and the elongated member 40 is inclined at a certain angle from the horizontal plane. After the rough setting is completed, the height is adjusted using the cambers 33, 33, and the extension member 40 is extended to firmly set the frame 10. Note that it is preferable to set the lining board 50 and the iron plate 60 before setting the frame using the extension members.

After the form frame 10 is set, concrete is forced into the concrete through the concrete injection port 13 formed in the face plate 12, and concrete is poured. Then wait for curing. Even if a vehicle or the like passes over the strut device 20 during this curing period, the vibrations will not be transmitted to the frame 30, and therefore the concrete formwork 10, and will not interfere with the curing of the concrete. It is clear that this will not impede tunnel excavation work. After curing is completed, the frame body 30 is separated from the formwork 10 at the pivot point of the elongated member 40. It is clear that in this case the elongated member 40 can be attached either towards the formwork 10 or towards the frame 30. The separated frame 30, ie, the strut device, is towed by a tractor shovel or the like to the next concrete placement location. Concrete is then placed using the same procedure.

As explained above, according to the present invention, the strut device is composed of a frame body and an elongated member provided between the frame body and the concrete formwork, and the elongated member is pivotally connected to the frame body and the concrete formwork. The frame body can be placed horizontally on the tunnel floor, and disassembly for movement can be done at pivot points, so it does not interfere with tunnel excavation work and can be easily moved. It's something that can be done easily. Furthermore, since the lining plate and the steel plate for facilitating the passage of vehicles, etc. are provided so as not to contact the frame, this has the excellent effect that the passage of vehicles, etc. does not impede the curing of the concrete.

The present invention is not limited to the above embodiments, and can be modified in various ways. For example, the lining plate 50 is simply attached to the base 5 without being welded to the members 51, 51.
3, 53. Further, the paving iron plate 60 may be pivotally attached to the supporting members 52, 52. Many other variations are possible, but they are not explained in detail.

[Brief explanation of drawings]

1 and 2 are horizontal and vertical cross-sectional views showing an example of the tunnel excavation method according to the present invention, FIG. 3 is a perspective view showing how the device of the present invention is used, and FIG. 4 is a FIG. 5 is a plan view showing an embodiment of the present invention, and FIG. 5 is a sectional view taken in the direction of the arrow - in FIG. 4. 4... Tunnel side wall, 10... Formwork for tunnel side wall, 30... Frame body, 40... Extension member, 42,
44... Pivot point, 50... Lining board, 60... Laying iron plate.

Claims (1)

[Scope of utility model registration request] A frame body formed from shaped steel into a substantially cross-shaped frame and placed in the center of the floor of the tunnel, and an elongated member having one end pivoted to the frame body and the other end pivoted to the formwork of the tunnel side wall. The frame body is provided apart from the members provided on both outside sides of the lining board, the height of the member provided on the outside is higher than the height of the frame body, and the frame body is supported by the member provided on the outside. A formwork strut device for a tunnel side wall, characterized in that the laid iron plate and the lining plate have a space with the frame body.