JP2503349B2 - Formwork device for secondary lining in tunnel - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a formwork device for secondary lining in a tunnel, and more particularly to a support for holding a predetermined space between the formwork and the primary lining surface and supporting the formwork. Regarding the improvement of legs.

[0002]

2. Description of the Related Art For example, in a tunnel having a primary lining constructed by the shield construction method, it is difficult to obtain a sufficient water leakage prevention effect only by the primary lining, so that a secondary lining must be applied to it. Often not.

As a formwork device for constructing this secondary lining, the applicant previously developed the formwork device shown in FIG. 3 (see Japanese Patent Publication No. 63-5560).

This formwork apparatus comprises a tubular formwork 3 for disassembling secondary lining which is assembled in a substantially circular shape along an inner wall surface 2 of a tunnel 1 which is primaryly lined, and radially outside the formwork 3. It is mainly configured by a plurality of spuds 4 as detachable support legs while protruding and contacting the primary lining surface.

The frame 3 is provided with side forms 3b connected to both sides of an upper crown form 3a via hinges 5 so as to be foldable and expandable, and is also provided on the lower side with foldable expansions via the hinges 5 as well. A pair of invert forms 3c connected to each other is assembled through a connecting portion such as a bolt, and the assembly and disassembly can be performed in the tunnel 1. The gate type disassembles during transportation, folds and runs inside. The dolly 6 moves in another formwork having the same shape, is developed on the front surface of the frontmost formwork, and is added to this.

According to this apparatus, the spud 4 is assembled.
The tip of the mold abuts the inner wall surface 2 to maintain a predetermined gap d between the mold 3 and the primary lining surface and to support the mold 3, so that the mold can be used during concrete pouring and curing. A hydraulic support device or the like for supporting the frame 3 is not necessary, and since the carriage 6 is also removed to another place, the internal space of the form 3 is vacant and the construction efficiency is remarkably improved.

Here, as shown in FIG. 4, each spud 4 is loosely fitted and inserted into a socket 8 screwed to a bracket 7 provided inside the form 3, and is pierced in the radial direction of the socket 8. By inserting the pin 9 into the pin hole 8a provided and a plurality of pin holes 4a bored in the radial direction of the spud 4, the pin 9 is locked and fixed to the socket 8.

Therefore, the protrusion amount of the spud 4 is adjusted at a constant pitch by selecting the pin hole 4a, and finely adjusted by screwing the socket 8 into the bracket 5. Further, during the concrete pouring work, the spud 4 is pulled out when the buoyancy force exerted by the concrete C exceeds the own weight of the entire formwork.

[0009]

However, in the formwork apparatus for the secondary lining having the supporting legs having such a structure, the crown form 3 is set after the invert form 3c is set.
a, when the side foam 3b is conveyed, if the protruding length of the spud 4 provided on the invert form 3c into the mold is long, particularly in a circular mold having a small diameter or a small and non-circular mold, The head of the spud 4 may come into contact with the carriage 6 or the crown foam 3a and the side foam 3b that are carried on the carriage 6 and subsequently transported, and may not be transported.

If the protrusion length of the spud 4 is limited,
There was a problem that the adjustment length could not be sufficiently obtained and the tip of the spud did not reach the primary lining surface.

The present invention solves the above-mentioned drawbacks, and its purpose is to limit the protruding length of the supporting leg, that is, the spud into the inside of the mold, and to make the adjustment length sufficiently large. A formwork device for the next lining is provided.

[0012]

In order to achieve the above object, the present invention relates to a disassembled tubular formwork for secondary lining which is assembled in a substantially circular shape along the inner wall surface of a tunnel which is primaryly coated, A plurality of removable support legs supported by a bracket provided inside the formwork, radially protruding to the outside of the formwork and abutting the primary lining surface, by the support legs, the formwork and the primary lining surface In the formwork device for secondary lining, which maintains a predetermined gap between the support frame and the bracket, the support leg located at least at the invert part of the plurality of support legs is the bracket. The socket is screwed into the socket and inserted through the inside and outside of the mold to project, and is inserted into a pin hole formed in the socket and a supporting leg head to insert the supporting leg into the socket. Pin to lock and fix When, is characterized in that the outside of the mold and a said support leg length adjustment brackets screwed to the tip of the.

[0013]

According to the above construction, the adjustment leg screwed to the tip of the support leg is screwed in and adjusted, and then the spud is inserted into the socket and fixed with the pin, whereby the support leg is projected to the inside of the form. The thickness of the secondary lining is roughly adjusted without doing this.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings. In the drawings, the same parts as those in the related art will be designated by the same reference numerals, and only different parts will be described by using different reference numerals. In FIG. 1, the formwork device for secondary lining is composed of a tubular formwork 3 for disassembling secondary lining which is assembled in a substantially circular shape along an inner wall surface 2 of a tunnel 1 in which primary lining is performed in a similar manner to the conventional one. In addition, a plurality of spuds 4 that radially protrude and come into contact with the primary lining surface and the spuds 10 as supporting legs according to the present invention are detachably provided on the outside of the formwork 3.

The frame 3 is provided with side forms 3b connected to both sides of the upper crown form 3a via hinges 5 so as to be foldable and expandable, and is also located on the lower side so as to be foldable and expandable via the hinges 5 as well. The pair of connected invert forms 3c are assembled through a connecting portion such as a bolt.

The spud 4 is disposed on the crown foam 3a and the side foam 3b and has a support structure similar to that of the conventional one. For example, as shown in FIG. A pin hole 8a that is loosely fitted and inserted into a socket 8 that is screwed into a bracket 7 that is provided inside the socket 8 and that is formed in the radial direction of the socket 8 and a plurality of pin holes 4a that are formed in the radial direction of the spud 4. It is locked and fixed to the socket 8 by inserting a pin into the socket.

Further, the spud 10 according to the present invention is provided on the invert form 3c in which the amount of protrusion into the form is a problem, and is screwed to the bracket 12 as shown in an enlarged view in FIG. A pin hole 14 loosely fitted in the socket 14 and bored in the radial direction of the socket 14.
The socket 1 is formed by inserting the pins 16 into a plurality of pin holes 10a formed in the radial direction of a and the spud 10.
4, but the pin hole 1 is larger than the spat 4
By limiting the number of 0a, the projecting length into the mold 3 is restricted, and even if the bottommost pin hole 10a is aligned with the pin hole 14a, interference with other molds or carts is prevented. The size is set to be avoidable. The uppermost pin hole 10a is a hole into which a burl for rotating operation or the like is inserted, and may have another rotating structure such as a quadrangle.

Further, the protruding end of the spud 10 from the mold 3 is made small in diameter, a male screw portion 10b is cut on the outer periphery thereof, and a female screw portion 18a is formed on the inner periphery of this portion for length adjustment. The sleeve 18 is screwed on. This sleeve 1
The outer diameter of 8 is the same as or smaller than the outer diameter of the spud 10,
This allows the spud 10 to be inserted and removed from the inside of the mold 3.

A procedure from the assembling of the secondary lining form device having the above-mentioned configuration to the concrete lining will be described. First, the invert form 3c is folded and conveyed as shown by the imaginary line in FIG. 1, is developed at the front part of the existing invert form 3c, and is adjusted in position and coupled to the tip surface of the existing invert form 3c using a bolt nut. . On the other hand, the spud 10 is attached near the front end face of the invert foam 3c. That is, the sleeve 18 is manually rotated in advance to adjust the approximate projection length of the spud 10 to the outside of the mold 3, and then loosely fitted into the socket 14 and fixed with the pin 16.
Then, if a burl or the like is inserted into the uppermost pin hole 10a and fine adjustment rotation is performed, the tip of the sleeve 18 comes into contact with the inner wall surface 2, and the setting of the invert form 3c is completed. When the spud 10 is also provided at the front and rear end intermediate portions of the invert form 3c, since the front and rear end portion leveling has already been set, the spud 10 at the intermediate portion is tentatively based on the spud 10 near the front end face. After adjustment, it can be easily attached by performing fine adjustment.

After that, the crown form 3a and the side form 3b are conveyed, unfolded and assembled to the invert form 3c, and the protrusion of the spud 4 is adjusted according to the same procedure as in the prior art, whereby the work of setting the form 3 is completed.

After the setting is completed, concrete C is placed in the gap d. When the concrete C is filled in the lower and side portions of the invert form 3a and the buoyancy generated by the concrete exceeds the dead weight of the form 3, the spud 10 of the invert form 3c is pulled out and a blind metal fitting is set to prevent the concrete from flowing in. To prevent. At this time, the spud 10 and the sleeve 18 are disassembled and washed with water, and
b. By applying grease to the female screw portion 18a, it is possible to prevent solidification and reuse it.

In the embodiment, the sleeve 18 is used as the metal fitting for length adjustment provided at the tip of the spud 10. However, the tip of the spud is formed in a sleeve shape and a female screw is cut inside the rod, and a rod having a male screw portion on the outer circumference is provided. It can also be screwed on. Of course, the spud 10 according to the present invention may be provided on the crown foam 3a and the side foam 3b as well. However, since the spout 10 is assembled after the crown foam 3a and the side foam 3b are assembled to the invert foam 3c, The protruding length of the spud into the mold is not a problem, and the spud of the conventional structure is sufficient.

[0023]

As described above in detail with reference to the embodiments, in the formwork apparatus for secondary lining according to the present invention, the spud is socketed after the adjustment fitting screwed to the tip of the spud is screwed in and adjusted. If the length of the spud is limited, the length of the spud can be adjusted roughly by adjusting the length of the socket and then fixing it with a pin. A sufficient amount of adjustment can be secured. Therefore, according to the present invention, it is possible to easily and quickly perform the secondary lining work even for a circular formwork having a small diameter, a small-sized non-circular formwork, and the like.

[Brief description of drawings]

FIG. 1 is a sectional view of a formwork device for secondary lining according to the present invention.

FIG. 2 is an enlarged sectional view of the main part.

FIG. 3 is a cross-sectional view of a conventional secondary lining formwork device.

FIG. 4 is an enlarged sectional view of the main part.

[Explanation of symbols]

 1 tunnel 2 inner wall surface (primary lining surface) 3 formwork 10 spud (supporting leg) 10a pin hole 10b male screw part 12 bracket 14 socket 14a pin hole 16 pin 18 length adjusting sleeve (length adjusting metal fitting) 18a female screw part

Claims (1)

(57) [Claims] 1. A decomposable tubular formwork for secondary lining, which is assembled in a substantially circular shape along the inner wall surface of the tunnel which is primarily covered, and the formwork supported by a bracket provided inside the formwork. A plurality of detachable support legs that radially project outside and contact the primary lining surface. The support legs maintain a predetermined gap between the formwork and the primary lining surface, and In the frame device for secondary lining adapted to support, the support leg located at least at the invert part among the plurality of support legs is loosely fitted and inserted into a socket screwed to the bracket to form the formwork. While protruding through the inside and outside of, the pin member which is inserted into the pin hole formed in the socket and the support leg head and locks and fixes the support leg to the socket, and on the outside of the mold, Screw the tip of the support leg. Tunnel the secondary lining for mold device being characterized in that a length adjustment fitting.