JP2558183B2 - Formwork for tunnel lining - Google Patents

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a formwork for tunnel lining.

[0002]

2. Description of the Related Art In a formwork for tunnel linings provided with invert foams arranged between side foams, jacks are used for expanding and demolding side foams and invert foams, respectively. A turnbuckle type jack is generally used as a jack for expanding and releasing the mold, but when raising and lowering the invert form, a lever block type or chain block type jack is used, and the invert form is placed between the side forms. It is also widely known to replace the jack with a turnbuckle when pushing it into the expanded position. The invert form set in the expanded position between the side forms is fixed to the side form with bolts, etc., but the tunnel lining formwork set in the expanded state in this way is a foam connection structure. Therefore, the buoyancy generated when placing concrete or the like between the formwork and the inner surface of the tunnel easily causes distortion. For this reason, the turnbuckle type jack used for expanding the side foam and the invert foam is generally used as a post to prevent distortion of the formwork when placing concrete or the like. Is.

[0003]

However, if these jacks are arranged as struts in the mold set in the expanded state, it will hinder the transportation and work of the material for placing the lining material. Therefore, there has been a problem that it becomes difficult to pass through the formwork.

Therefore, an object of the present invention is to remove all or a part of the jacks from the inside of the mold set in the expanded state so as to secure a wide working space inside the mold and at the time of placing a lining material. The purpose of the present invention is to provide a form for tunnel lining that is less likely to cause distortion.

[0005]

In order to achieve the above object, according to the present invention, a pair of left and right side foams pivotally supported by a top end portion and a swinging tip end portion of the side foams are arranged. In a formwork for tunnel lining that expands and demolds the installed invert form with a jack, a presser foot extending from the inner surface of at least one side foam in the expanded state to the inner surface of the invert form in the expanded state. It is characterized in that the metal fitting is fixedly arranged inside at least one of the side foams in the expanded state and the invert foam in the expanded state.

[0006]

In the tunnel lining form having the above structure, after the side foam and the invert foam are opened by the jack, the holding metal fittings extending from the inner surface of at least one of the side foam to the inner surface of the invert foam are expanded. Since it is fixedly arranged inside at least one of the side foam in the open state and the invert foam in the expanded state, the relative displacement between the invert foam and the side foam is suppressed by the holding metal fittings, and the mold in the expanded state is not distorted. Less likely to occur. Therefore, you can remove all or part of the jacks from inside the mold as needed until you start the demolding operation after setting the mold in the expanded state, and create a large working space in the mold. You will be able to secure.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The first to fifth embodiments of the present invention will be described below with reference to FIGS. In these figures, the same or similar components are designated by the same reference numerals.

FIG. 1 is a schematic sectional view of a tunnel lining form frame showing a first embodiment of the present invention. Referring to this figure,
The mold 10 includes, for example, a top end foam 11 attached to a top end beam 10 which is supported by a lift jack (not shown) of a form support device so as to be able to move up and down, and both ends of the top end foam 11 in the circumferential direction. A pair of left and right side forms 14,1 pivotably supported by hinge pins 12,13
5 and an invert form 16 disposed between the swinging tip portions (here, lower end portions) of the side forms 14 and 15, and in this embodiment, one end portion in the circumferential direction of the invert form 16 has a hinge pin 17. It is pivotally attached to the swinging tip end of one of the side forms 14 via the swingable end.

In the tunnel lining form having the above structure, in the expanded state shown in the drawing, the other end of the invert form 16, that is, the swinging tip portion, abuts the swinging tip portion of the other side form 15. Pin or bolt 1
8 is connected and fixed to the swinging tip of the side form 15. The expansion and demolding operations of the formwork are performed using jacks. In this embodiment, a jack simply indicated by a virtual line 19 uses the hinge pin 17 as a fulcrum to form the invert form 1.
6 is used to spread and demold. Further, the jack simply shown by the imaginary line 20 is the hinge pin 1
It is used to actuate the side foams 14 and 15 with the pivots 2 and 13 as fulcrums.

The jack 20 has both side foams 1.
4 and 15 are simultaneously expanded and contracted, but this jack 20
Alternatively, for example, the side foams 14 and 15 can be individually actuated by jacks that are simply shown by imaginary lines 21 and 21. A turnbuckle type jack can be used as these jacks, but a lever block type or chain block type jack may be used, and a turnbuckle type jack and a lever block type or chain block type jack may be used. May be used properly.

The swing tip of the invert form 16 set to the expanded position by using a jack is connected and fixed to the swing tip of the side form 15 with a pin or bolt 18. As a result, the mold is set in an expanded state, and in this embodiment, a continuous cylindrical outer peripheral surface is formed and an annular lining space is formed between the mold and the tunnel inner surface.

In order to smoothly perform the work of placing the lining material, it is desirable to remove all or some of the jacks in the formwork. However, the formwork is hinge pin 1
Due to the foam connection structure via 2, 13, 17, etc., when the jack is removed and a lining material such as concrete is placed in the annular space, the mold is likely to be distorted by the action of buoyancy.

Therefore, in this embodiment, in accordance with the present invention, the arc-shaped press fittings 22 extending from the inner surfaces of the expanded side foams 14 and 15 to the inner surface of the invert foam 16 are the invert foam 16 and the side foams. It is fixedly arranged on the inside of 14, 15. The holding metal fitting 22 has, for example, a substantially L-shaped cross section, and each side foam 1 is expanded by a pin or a bolt 23.
4, 15 and the invert form 16 in the expanded state can be fixed, but the holding metal fitting 22 itself may be fixed to the invert form 16 only by the pin or the bolt 23 or only to the invert form 16 and one side form. . In addition, as shown in the figure, when the pressing metal fitting 22 is fixed to both side forms 14 and 15 and the invert form 16 with a pin or a bolt, the invert form 1
Pin or bolt 1 for fixing 6 and the side foam 15
8 can be omitted.

The holding metal fitting 22 is attached to the side forms 14, 15
And the invert form 16 and the side form 1 are fixedly arranged inside the invert form 16.
Since the relative displacement of 4 and 15 is suppressed by the pressing metal fitting 22, the mold in the expanded state is unlikely to be distorted. Therefore, it is possible to remove all or some of the jacks from the inside of the mold as necessary until the demolding operation is performed after the mold is set in the expanded state, and a wide working space is secured in the mold. be able to.

When the mold is released from the mold, a pin or bolt 23
Is removed and the holding metal fitting 22 is removed. Tapered pins are preferably used as the pins or the pins used for the bolts 18 and 23.

FIG. 2 is a schematic sectional view of a tunnel lining form showing a second embodiment of the present invention. In this embodiment, one end portion of the holding metal fitting 22 is pivotally supported near a swinging tip portion of one side form 14 via a hinge pin 24, and the holding metal fitting 22 is a pin or a bolt 23 for the invert form 16 and the other. It is fixed to the side foam 15. It should be noted that the holding fitting 22 with the pin or bolt 23
May be fixed only to the invert form 16 or the other side form 15.

In the second embodiment as well, similarly to the first embodiment, the distortion of the mold in the expanded state can be suppressed by the holding metal fitting 22. In the case of this embodiment, since the pin or bolt 23 is removed when the invert form 16 is released from the mold, the holding metal fitting 22 can be rotated together with the invert form 16 with the hinge pin 24 as a fulcrum. No need to remove 22.

FIG. 3 is a schematic sectional view of a tunnel lining form frame showing a third embodiment of the present invention. In this embodiment, the second
Similar to the embodiment, one end portion of the holding metal fitting 22 has the hinge pin 2
Although it is pivotally supported in the vicinity of the swinging tip portion of one of the side forms 14 through 4, the pressing metal fitting 2 is different from the second embodiment.
2 is terminated on the inner surface of the invert form 16.
Pins or bolts 23 are used to secure the retainer 22 to the invert form 16. Since the place where the distortion is most likely to occur in the form is the hinge connection part between the invert form 16 and the side form 14, by fixing the pressing metal fitting 22 inside the invert form 16 and the side form 14 across the hinge pin 17. As in the second embodiment, the distortion of the mold can be efficiently suppressed.

FIG. 4 is a schematic sectional view of a tunnel lining form showing a fourth embodiment of the present invention. In this embodiment, for example, a pair of left and right side arms pivotally supported by a supporting device (not shown) equipped with an elevating jack has left and right side forms 1.
4, 15 are fixedly supported. Further, in this embodiment, one ends of the pair of invert forms 16A and 16B are pivotally attached to the swinging tip ends of the side forms 14 and 15 via hinge pins 17A and 17B, respectively. The end portions, that is, the swinging front end portions are connected and fixed by pins or bolts 18. Invert forms 16A and 16B are virtual lines 2
It is possible to perform demolding and expanding operations by jacks shown schematically at 5 and 25, respectively. Further, the side foams 14 and 15 can be released from the mold and expanded by a jack schematically shown by an imaginary line 26. The holding metal fitting 22 has both side foams 14 and 15 in the expanded state.
Extending from the inner surface of the invert forms 16A, 16B to the inner surface of both invert forms 16A, 16B.
When the B and the side forms 14 and 15 are in the expanded state, the side form 1 is fixed by the pin or bolt 23.
4, 15 and the invert forms 16A, 16B are attached to the inner surfaces to suppress the distortion of the formwork. In addition, the holding metal fittings 22 are both invert forms 16
Although it is possible to achieve the intended purpose satisfactorily even if it is fixed to A and 16B only or to both side foams 14 and 15 only with pins or bolts 23, as shown in the figure, the holding metal fitting 22 is attached to both sides with pins or bolts 23. When fixing to the foams 14 and 15 and both invert forms 16A and 16B, the pin or bolt 23 that fixes the invert forms 16A and 16B to each other can be omitted.

FIG. 5 is a schematic sectional view of a tunnel lining form showing a fifth embodiment of the present invention. In this embodiment, both ends of the invert form 16 are side forms 14, 15
Of the invert form 16 and the side form 1.
When the pins 4 and 15 are opened, the pin or bolt 18
A and 18B can be connected and fixed to the swinging tip portions of the side forms 14 and 15. The demolding and expanding operations of the invert form 16 can be performed by, for example, a jack schematically shown by imaginary lines 19 and 19. Further, the demolding and expanding operations of the side foams 14 and 15 can be performed by, for example, a jack simply shown by an imaginary line 20.

The holding metal fitting 22 is inserted into the invert form 16 from the inner surfaces of both side forms 14 and 15 which are in the expanded state.
Of the side forms 14,1 by means of pins or bolts 23 when the invert form 16 and the side forms 14,15 are in the expanded state.
5 and the invert form 16 are attached to the inner surface to suppress the distortion of the formwork. Invert form 1 using pins or bolts 18A, 18B
When 6 is fixed to both side forms 14 and 15, the intended purpose can be achieved by fixing the holding metal fitting 22 to only the invert form 16 or only to both side forms 14 and 15 with the pin or bolt 23. .

Although the illustrated embodiment has been described above, the present invention is not limited to the embodiment of the above embodiment,
For example, the form is not limited to the cylindrical form, and the side forms 14 and 15 may be pivotally attached to each other at the top end. Further, the shape, the number and the mounting method of the holding metal fittings 22 can be appropriately changed according to the shape of the mold and the like.

[0023]

As is apparent from the above description, according to the present invention, the relative displacement between the invert form and the side form in the expanded state can be suppressed by the holding metal fitting, so that the mold in the expanded state can be suppressed. Distortion is less likely to occur. Therefore, you can remove all or part of the jacks from inside the mold as needed until you start the demolding operation after setting the mold in the expanded state, and create a large working space in the mold. A formwork for tunnel lining that can be secured can be provided.

[Brief description of drawings]

FIG. 1 is a schematic sectional view of a tunnel lining form frame showing a first embodiment of the present invention.

FIG. 2 is a schematic sectional view of a tunnel lining formwork showing a second embodiment of the present invention.

FIG. 3 is a schematic sectional view of a tunnel lining formwork showing a third embodiment of the present invention.

FIG. 4 is a schematic sectional view of a tunnel lining formwork showing a fourth embodiment of the present invention.

FIG. 5 is a schematic sectional view of a tunnel lining formwork showing a fifth embodiment of the present invention.

[Explanation of symbols]

 11 Top end foam 14,15 Side form 16,16A, 16B Invert form 17,24 Hinge pin 18,18A, 18B, 23 Pin or bolt 19,20,21,25,26 Jack 22 Holding metal fitting

Claims (1)

(57) [Claims] 1. A tunnel for expanding and demolding a pair of left and right side foams pivotally supported on a top end portion and an invert foam disposed between rocking tip portions of the side foams with a jack. In the formwork for lining, a holding metal fitting extending from the inner surface of at least one of the side forms in the expanded state to the inner surface of the invert form in the expanded state is provided with at least one of the side forms in the expanded state and the expanded state. Formwork for tunnel lining, which is fixedly placed inside the invert form.