JPS635560B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a formwork device for secondary lining in tunnels.

For example, in tunnels constructed using the shield method and with a primary lining, it is difficult to obtain sufficient leakage prevention effects with the primary lining alone, so it is often necessary to add a secondary lining to the tunnel. . In such a case, as shown in the conventional example in FIG.
The formwork 5 is assembled into a substantially circular shape, and the formwork 5 is supported by an operating arm 13 of a hydraulic device loaded on a gate type 11, which is a type of work platform, thereby creating a space between the formwork 5 and the primary lining surface 4. maintain a predetermined gap between
Even in such a state, the secondary lining concrete 21 was placed in the gap. After curing of the concrete 21 is completed, the formwork 5 is removed to complete the secondary lining. Thereafter, the gate type 11 is moved forward to begin setup work for the secondary lining in the next section. The construction of the secondary lining is carried out sequentially as described above, but the problem here is that while the concrete 21 is being poured and while waiting for the concrete 21 to cure, the formwork is As a result, the work space inside tunnel 2 is occupied by the gate type 11, etc., and it is not possible to carry out setup work for the next secondary lining. That's true. In other words, the conventional formwork apparatus for secondary lining in a tunnel cannot necessarily be used to perform secondary lining efficiently. There was also a means to hold the formwork 5 without using the gate mold 11, but in this case as well, the hydraulic device etc. for holding the formwork 5 would still become an obstacle in the tunnel. Therefore, secondary lining cannot be performed efficiently.

This invention was made in view of the above-mentioned problems in the prior art, and its purpose is to eliminate the need for support devices such as gate-shaped or hydraulic devices that are obstacles in tunnels. Inside the tunnel, the secondary lining concrete can be held securely in the tunnel without any damage, and the interval at which the secondary lining concrete is placed can be easily adjusted, thereby significantly increasing the construction efficiency of the secondary lining. An object of the present invention is to provide a formwork device for secondary lining.

Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

Note that the same or corresponding parts in each figure are indicated by the same reference numerals.

FIGS. 2, 3, and 4 show an embodiment of a formwork apparatus for secondary lining in tunnels according to the present invention. The formwork device shown in the figure is installed in a tubular formwork 5 for secondary lining which is assembled in a substantially circular shape along the inner wall surface 4 of the tunnel 2 which has been primarily lined. A plurality of support legs 12 that protrude and come into contact with the primary lining surface are removably provided, and the support legs 1
2, a predetermined gap d is maintained between the formwork 5 and the primary lining surface. Here, the formwork 5 is, as shown in FIGS. 2 and 3,
A crown form 6, a side form 7, and an invert form 8 are assembled by means of a hinge 9 and a connecting part 10 such as a bolt, and is constructed so that assembly and disassembly can be performed inside the tunnel 2. Then, only when assembling and disassembling the formwork 5, the gate mold 11 is used as shown in FIG. As shown in detail in FIG. 4, the support legs 12 are removably attached via intermediate members 17 to brackets 16 which are fixedly protruding from the inside of the formwork 5 by welding or the like. The intermediate member 17 has a cylindrical shape and has a threaded portion 17a formed around its outer periphery, and this threaded portion 17a is screwed into a threaded portion 16a formed on the bracket 16 side. The support legs 12 loosely pass through the intermediate member 17 and protrude radially from the inside of the formwork 5 to the outside. The leading end portion 14 then comes into contact with a receiving portion 22 fixed in advance to the inner wall surface 4 of the primary lining portion 3. Further, a plurality of pin holes 18 are arranged at appropriate intervals on the base end side 15, and the pin holes 18 and the pin holes 1 provided in the intermediate member 17 are arranged at appropriate intervals.
The support leg 12 is fixed by a fixing pin 20 passing through the support leg 9.
and intermediate member 17 are locked and connected to each other.
The protruding length d of the support leg 12 is set stepwise by selecting the position of the pin hole 18 through which the fixing pin 20 passes, and is further finely adjusted continuously by rotating the intermediate member 17. In this way, each of the plurality of support legs 12 has its projection length d adjusted to the outside of the formwork 5, and defines a gap from the primary lining surface of the formwork 5 as shown in FIGS. 2 and 3. . After assembling the formwork 5 on the inside of the primary lining surface and determining its position using the support legs 12 as described above, the gate form
It is retained as is even if there is no 1. Therefore, after determining the position of the formwork 5, for example, as shown in FIG. 21 can be poured and cured.
On the other hand, the portal mold 5 further advanced from this formwork 5 can be used to assemble the next formwork 5 in the section adjacent to the front of the formwork 5. Alternatively, it can be moved back and used for the removal work of the formwork 5 in which the concrete 21 has already been cured. Thereby, other work can be performed while the concrete 21 is being poured and until the curing of the concrete 21 is completed. Furthermore, the support legs 12 can be prevented from protruding outward from the inside of the formwork 5 and do not protrude inward too much, thereby ensuring sufficient work space for efficiently carrying out other operations. You can also do it. Note that the support leg 1
If 2 is constructed of a hollow pipe, the above-mentioned gap d can be directly confirmed from this hollow part.

As described above, according to the formwork device for secondary lining in tunnels according to the present invention, concrete for secondary lining can be cast and cured without interfering with other work. Therefore, construction efficiency can be significantly improved.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an example of a conventional formwork device for secondary lining, and FIGS. 2 and 3 are sectional views showing an example of a formwork device for secondary lining according to the present invention, respectively. FIG. 4 is an enlarged sectional view of the main part thereof, and FIG. 5 is a sectional view showing the inside of the tunnel where secondary lining work is being performed using the formwork apparatus according to the present invention. 1... Earth, 2... Tunnel, 3... Primary lining section, 4... Inner wall surface of primary lining section, 5... Formwork, 6
...Crown form, 7...Side form,
8...Invert form, 9...Hinge part, 1
0...Connection part, 11...Gate type, 12...Support leg,
14... Its distal end, 15... Its proximal end, 16
... Bracket, 17 ... Intermediate member, 18 ... Pin hole, 19 ... Pin hole, 20 ... Fixed pin, 21
...Concrete, 16a, 17a...Threaded part.

Claims (1)

[Claims] 1. A secondary lining tubular form that can be disassembled and assembled in a substantially circular shape along the inner wall surface of the primary lining tunnel is provided with a plurality of molds that protrude radially from the inside of the formwork to the outside and come into contact with the primary lining surface. A support leg is removably provided via a bracket protruding inward from the formwork, and the support leg maintains a predetermined gap between the formwork and the primary lining surface, and only the support leg A secondary lining formwork device supporting the formwork with A formwork device for secondary lining in a tunnel, characterized in that the legs are locked and fixed to the intermediate member through pin holes drilled in the radial direction of the legs.