JPH0718317B2 - Formwork for tunnel lining - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tunnel lining form, and more particularly to a tunnel lining form having an invert foam between the ends of a pair of side forms.

[0002]

2. Description of the Related Art In a conventional tunnel lining form having an invert foam between the ends of a pair of side foams, generally, one end of the invert foam and the end of one of the side foams are paired with each other. Each of the hinge brackets is formed, and the invert foam is pivotally attached to the one side foam so as to be detachable from the one side foam via hinge pins inserted into both the hinge brackets. The other end of the invert form and the end of the other side form are formed so as to be able to abut each other, and when these ends are abutted and the form is expanded, the inverts are formed at these end portions. The foam and the other side foam are fastened and fixed by fastening means such as bolts.

When the above-mentioned form is set in an expanded state in a tunnel and concrete lining is performed, the other end of the invert form and the end of the other side form are removed to remove the form. The fastening means for fastening the and is removed, and then the invert form is demolded, that is, rotationally displaced into the tunnel through the hinge pin on one end side thereof by the jack means, whereby the demolding of the entire form is performed. Allows radial contraction. When the formwork is removed from the concrete lining surface in this way, the formwork is moved to the next concrete lining section in the tunnel by the formwork trolleys located outside the longitudinal ends of the formwork. Expanded set.

[0004]

In the above-mentioned conventional form for tunnel lining, the demolding amount of the side foam in which the invert form is connected via the hinge pin is larger than the demolding amount of the other side form. Get smaller. Therefore, when the formwork is used in a curved tunnel, the sideform connected to the invert form will contact the tunnel lining surface near the center of the curve, and the demolded formwork will not be able to bend the curve of the tunnel. There is. In such a case, it may be possible to avoid contact with the tunnel lining surface by shifting the support positions of both ends of the form on the front and rear support carriages from the center of the support carriage. Since the work for changing the supporting position of the end portion of the form on the supporting carriage is separately required, the work becomes complicated. Also,
When the mold is released from the mold, the center of gravity of the mold is biased toward the side form to which the invert form is connected. For this reason, when the form supporting position on the support carriage is shifted, the form may lose its balance and fall due to the deviation of the center of gravity of the form.

Therefore, an object of the present invention is to change the demolding form of the invert form into various forms depending on the condition such as the curve state of the tunnel, and to move in the tunnel in the optimum demolding form. The purpose is to provide a formwork for tunnel lining.

[0006]

In order to achieve the above object, according to the present invention, in a tunnel lining formwork having an invert form between the ends of a pair of side forms, both ends of the invert form are provided. Part and the end portions of the both side foams are formed so as to be capable of abutting each other, and the invert foams are respectively attached to the both end portions of the invert foam and the end portions of the both side foams. There is provided a tunnel lining formwork characterized in that a hinge bracket for removably attaching a hinge pin for pivotally attaching to the mold is detachably attached thereto.

[0007]

In the formwork for tunnel lining having the above-mentioned structure, the invert form can be selectively pivotally attached to either of the side forms by using the hinge pin. The foam can be demolded while being pivotally attached to the side foam on the desired side, and the invert foam can be demolded separately from both side foams. When the invert form is separated from both side foams and released from the mold, the invert form can be removed from the mold in any posture. Can be adjusted.

Therefore, it is possible to perform the optimum demolding and moving according to the condition such as the curved state of the tunnel.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an end view of a formwork for tunnel lining showing an embodiment of the present invention, and FIGS. 2 to 5 are end face views showing different demolded states of the formwork shown in FIG. 1, respectively. 6 shows an example of means for fastening and fixing the invert form and the side form of the form shown in FIG.

First, referring to FIG. 1, a tunnel lining formwork 1 is provided with a pair of left and right side forms 2, 3. The upper ends of both side foams may be connected to each other via a hinge mechanism, but in this embodiment, the upper ends of both side foams 2, 3 are hinge pins 5, 6 to both ends of the top foam 4. Each of them is pivotally attached so that they can be removed from the mold. As a method of supporting the mold 1 in the tunnel in the longitudinal direction and vertically movable by the mold support carriage, it is swingably provided on a member which can be moved up and down by an elevator jack on the form support carriage. The side foams 2 and 3 may be connected to the left and right support arms, respectively, but in this embodiment, the top end foam 4 is fixed to the top end beam 7 extending through the mold 1 in the longitudinal direction, Both ends of the top beam 7 are supported so as to be able to move up and down by a lifting jack on a frame support carriage (not shown).

An invert foam 8 is arranged between the lower ends of the side foams 2 and 3. Both ends 8a, 8b of the invert form 8 and side forms 2, 3
The lower end portions 2a and 3a of the are respectively formed so that they can abut each other. When both ends 8a and 8b of the invert form 8 are abutted against the lower ends 2a and 3a of the side forms 2 and 3, in this embodiment, as shown in FIG. 1, the form 1 is in an expanded state. It becomes a cylinder, and the concrete lining space is defined around it. In this case, depending on the tunnel construction method, the outer peripheral side of the concrete lining space is defined by the primary lining segment previously provided in the ground of the tunnel or the ground of the tunnel. That is, in the construction method of sequentially assembling the primary lining segment in the rear part while advancing the shield excavator, a secondary lining of concrete is formed between the primary lining segment and the mold 1 inside thereof, It is also possible to form the concrete lining directly between the tunnel ground and the formwork 1 at the rear part while advancing the shield excavator.

Both ends 8a, 8b of the invert form 8
The lower ends 2a and 3a of the side forms 2 and 3 can be fastened and fixed to each other by fastening means when the formwork 1 is in an expanded state. Although bolts and nuts may be used as the fastening means, it is preferable to use a conical taper pin 9 as shown in FIG. Further, the bolt / nut and the taper pin 9 may be used together. The taper pin 9 preferably has a non-circular head portion 9a, such as a quadrangle or a hexagon, and a taper portion 9b. The taper portion 9b of the taper pin 9 corresponds to the end portions 8a and 8b of the invert form 8 and the side forms 2 and 3. By hammering into the holes formed in the lower end portions 2a, 3a with a hammer or the like, the positioning and fastening and fixing of the invert form 8 and the side forms 2, 3 can be performed easily and quickly. Also,
By rotating the taper pin 9 with a tool engaged with the head 9a of the taper pin 9, the taper pin 9 can be loosened easily and quickly and removed from the hole.

Further, both ends 8 of the invert form 8
a, 8b and lower end portions 2a of both side foams 2, 3
3a includes hinge brackets 11a, 11b and 12, 13 for removably attaching a hinge pin 10 for pivotally attaching the invert form 8 to each of the side forms 2, 3 so that the invert form can be demolded. It is provided.

In the formwork for tunnel lining having the above construction, the hinge pin 10 is attached to the hinge bracket 12 of one side form 2 and the hinge bracket 8a of the one end 2a of the invert form 8 as shown in FIG. When the mold 1 is released from the mold, the invert form 8 is removed by the jack means 14 toward the side form 2 on one side around the hinge pin 10 as shown in FIG. 3 can move out of the tunnel inside the tunnel. At this time, since the invert form 8 is connected to the one side form 2 and is separated from the other side form 3, the center of gravity of the form 1 is biased to the side form 2 side. Further, in the case of the internal shape of the mold 1 as shown in the figure, when the invert form 8 is demolded, it is possible to secure a larger demolding operation stroke in the other side form 3 than in one side form 2. Become. Therefore, such a demolded state may be convenient when the formwork 1 moves in the tunnel curved to the right in the figure.

On the other hand, the hinge pin 10 is connected to the hinge bracket 13 of the other side form 3 and the invert form 8.
When it is attached to the hinge bracket 11b of the other end 8b of the invert form 8 when the mold 1 is released from the mold.
As shown in FIG.
The mold is moved to the other sideform 3 side around the center of the mold, whereby both the sideforms 2 and 3 can be removed from the inside of the tunnel. At this time, the center of gravity of the mold 1 is the other sideform 3 It will be biased to the side. Further, in this case, a larger demolding operation stroke can be secured in the one side foam 2 than in the other side foam 3. Therefore, such a demolded state may be convenient when the mold 1 moves in the tunnel curved to the left in the drawing. It should be noted that when the support position of the longitudinal end of the mold 1 with respect to the support carriage (not shown) is displaced from the center of the support carriage in order to pass through the curve in the tunnel, the balance of the center of gravity of the form 1 with respect to the support carriage is accordingly In that case, the invert form 8 can be pivotally attached to a required side form and demolded so that the center of gravity of the formwork 1 can be balanced.

Further, when the mold 1 is expanded, the both ends 8a and 8b of the invert form 8 are respectively attached to the lower ends 2a and 3a of the side forms 2 and 3 by using fastening means such as the taper pin 9 without using the hinge pin 10. When connecting,
After removing the fastening means at both ends of the invert form 8 when the mold 1 is released from the mold, the invert form 8 is attached to the lower ends 2 of the side forms 2 and 3 as shown in FIGS. 4 and 5.
It is possible to remove the mold upward from between a and 3a by the jack means 14. At this time, as shown in FIG.
The invert foam 8 may be pulled up substantially horizontally, but as shown in FIG. 5, the pulled up invert foam 8 can be further suspended in a vertical posture. Also,
By suspending the invert form 8 in an appropriately inclined posture, it is possible to secure the maximum demolding amount of both side forms 2 and 3 and adjust the position of the center of gravity of the form 1.

As the jack means 14 used for various demolding operations of the above-mentioned invert form 8, for example, a chain block type jack can be used, but other types can be used as long as the required moving stroke can be secured. It may be a jack. In this embodiment, the upper end of the jack means 14 for demolding the invert foam 8 is attached to the ceiling beam 7, but the ceiling beam 7
In the case of the formwork 1 having no front end, the upper end of the jack means 14 is set to the top end foam 4 or any of the side foams 2 and 3.
Can be attached to. Also, the side form 2,
The demolding operation of 3 can be performed by various jack means (not shown) such as a turnbuckle type, a chain block type, and a lever block type. Further, when the mold 1 is expanded and set and concrete lining is performed, invert form 8 is used to prevent deformation of the mold 1 due to external pressure.
And the top beam 7 (if the top beam is not provided, a turnbuckle type jack means (not shown) having rigidity may be separately provided between the top beam 4 and the side foam.

After the mold 1 is demolded in the above-described various modes, the mold 1 is moved to the next concrete lining section by the mold supporting carriages before and after the mold 1, and is expanded again at that place. Set.

[0019]

As is apparent from the above description, according to the present invention, it is possible to perform the demolding operation of the invert form in various modes. Therefore, it is possible to optimize the formwork according to the situation such as the state of the curve of the tunnel. It becomes possible to move it in a demolded form.

[Brief description of drawings]

FIG. 1 is a schematic end view of a tunnel lining formwork showing an embodiment of the present invention.

FIG. 2 is a view showing one mode of a mold releasing operation of the invert form of the form shown in FIG.

FIG. 3 is a view showing another mode of demolding operation of the invert form of the form shown in FIG.

FIG. 4 is a view showing still another mode of demolding operation of the invert form of the form shown in FIG. 1.

FIG. 5 is a view showing still another mode of demolding operation of the invert form of the form shown in FIG. 1.

FIG. 6 is a diagram showing an example of fastening means for fastening and fixing the invert form and the side form of the form shown in FIG.

[Explanation of symbols]

 1 formwork, 2 side form, 3 side form, 4 top end form, 7 top end beam, 8 invert form, 9 taper pin (fastening means), 10 hinge pin, 11a hinge bracket, 11b hinge bracket, 12 hinge bracket, 13 hinge Bracket, 14 jack means.

Claims (1)

[Claims] 1. A tunnel lining formwork comprising an invert form between the ends of a pair of side forms, wherein both ends of the invert form and the ends of the both side forms can abut against each other. A hinge pin for pivotally attaching the invert foam to each of the both side foams so that it can be removed from the both ends of the invert foam and the end portions of the both side foams is formed. Form for tunnel lining, characterized by having hinge brackets for attaching to each.