JP2648632B2 - Concrete formwork binding device - Google Patents

Description

The present invention relates to an apparatus for joining concrete forms,
In particular, the present invention relates to a formwork joining device suitable for frequently diverting the formwork as in tunnel lining work or assembling the formwork in a narrow space.

《Conventional technology》 As one type of tunnel construction method, a shield method is known. In this type of method, a tunnel section immediately after excavation is usually laid temporarily, followed by a secondary lining. Is performed.

Concrete is generally used for these lining works, and in particular, in the case of secondary lining, an annular formwork is installed on the inner side of the temporary lining to form a secondary lining concrete layer. You.

The formwork used at this time is, for example,
As disclosed in Japanese Patent Publication No. 036, it is composed of portions called an inverted foam portion, a side foam portion, and a crown foam portion, and is assembled in a cylindrical shape, and is used by connecting a plurality of cylindrically assembled ones. You.

Such a formwork is sequentially removed from the part where curing has been completed with the progress of construction, sent forward in a state where it is disassembled into two parts, assembled again into a cylindrical shape, and connected.

However, the concrete formwork device having such a configuration has a technical problem described below.

<< Problems to be Solved by the Invention >> That is, conventionally, when assembling a formwork into a cylindrical shape, or when connecting assembled ones to each other, a joining surface between each form and a form between axially adjacent forms. A through-hole communicating with each other is provided in advance on the connection surface, a bolt is inserted into this through-hole, a nut is screwed and tightened, and the nut and the bolt are fastened together. Since many bolts and nuts have to be attached to the joint surface and the connection surface, it takes a long time to release the attachment, resulting in poor efficiency.

The present invention has been made in view of such conventional problems, and an object of the present invention is to provide a concrete formwork joining device that can be easily released.

<< Means for Solving the Problems >> In order to achieve the above object, the present invention relates to a joining device for a concrete form, wherein the joining device has a clamp pin and a wedge body, and the clamp pin is A head larger than a through-hole provided on a joining surface or a connection surface of the formwork, a shaft integrated with the head, a hole formed in the shaft, and a lower surface of the head And a pair of elastic tongues provided on the side, and the wedge body is press-fitted into the hole while the shaft is inserted from one end of the through-hole, and between the elastic tongue and the wedge body. And the formwork is joined by holding the joining surface therebetween.

The elastic tongue may be constituted by a pair of plate-like portions bent in directions away from each other.

Also, the wedge body may have a structure having a slope inclined downward from one end side to the other end side, and having a slit hole opened at the one end side.

Further, the concrete mold joining device of the present invention has a clamp pin and a wedge body, and the clamp pin has a head larger than a through hole provided in a joining surface or a connecting surface of the mold. A shaft portion integrated with the head portion, and a hole formed in the shaft portion, wherein the wedge body has a slope inclined downward from one end side to the other end side; A slit hole that opens to the side, and press-fits the wedge body into the hole portion in a state where the shaft portion is inserted from one end of the through hole, thereby joining the joining surface between the head portion and the wedge body. It is characterized in that the formwork is joined by being sandwiched.

<< Effects of the Invention >> According to the concrete formwork joining device having the above structure,
Pressing the wedge body into the hole of the clamp pin can join the joining surface and connecting surface of the formwork, and removing the press fit of the wedge body releases the connection, making it much easier than fastening with a bolt and nut. Become.

Embodiment Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 to 3 show an embodiment of a concrete formwork joining apparatus according to the present invention.

The coupling device shown in FIG.
And a wedge body 12 shown in FIG.

The clamp pin 10 has a head 10a, a shaft 10b integrally formed below the head 10a, a rectangular tapered hole 10c formed in the shaft 10b, and a lower surface of the head 10a. It is composed of a pair of elastic tongues 10d, 10d provided integrally on both sides.

The hole formed in the shaft portion 10b does not necessarily need to be formed in a tapered shape, for example, when the thickness thereof is considerably thin.

The elastic tongues 10d, 10d are provided with a cutting line at the lower side of the head 10a, and the portions located outside the cutting line are separated by a predetermined angle in the thickness direction of the clamp pin 10 so as to be separated from each other. It is formed by bending at.

The clamp pin 10 having such a configuration, for example, inserts a necessary cutting line with a laser beam into a steel plate material,
It is easily obtained by bending the parts d and 10d.

The wedge body 12 is made of a steel block, has a flat surface 12a formed on an upper surface side, and has an inclined surface 12b inclined from one end to the other end formed on a lower surface side.

In this embodiment, a slit hole 12c is provided between the flat surface 12a and the inclined surface 12b, extending in the axial direction of the wedge body 12 and opening to the rear end side of a large area.

The coupling device configured as described above is mounted on a concrete formwork as shown in FIG.

In the figure, the portion indicated by reference numeral 14 is a joining flange of a concrete formwork, and these joining flanges 14
Through holes 16 that match each other are provided in advance.

In this embodiment, the through hole 16 has a size corresponding to the size of the shaft portion 10b, and is smaller than the size of the head portion 10a.

The distance between the lower end of the elastic tongue 10d of the clamp pin 10 and the upper end of the tapered hole 10c is set to be slightly smaller than the thickness of the two joined flanges 14 combined.

In joining the joining flanges 14, first, the positioning of the through holes 16 between the flanges 14 is performed.

At this time, the tip of the shaft portion 10b of the clamp pin 10 is inserted into the through hole 16 of the one joining flange 14, and the head 10a is hit with a hammer, so that the position of the through hole 16 is adjusted using the clamp pin 10. You can also

FIG. 3A shows a state in which the positioning of the through-hole 16 has been completed and the shaft portion 10b of the clamp pin 10 has been inserted into the through-hole 16.

When the mounting of the clamp pin 10 is completed, the tip of the wedge body 12 is inserted into the tapered hole 10c, and the rear end face of the wedge body 12 is hit with a hammer so that the tapered hole 10c is formed.
And press it into the appropriate position.

By this operation, the joining flange 14 is sandwiched between the elastic tongue piece 10d and the flat surface 12a of the wedge body 12, and the joining is completed.

When the connection is completed, the elastic tongue 10d and the wedge 12
The resilient force of each slit hole 12c is
Therefore, an extremely large joining force can be obtained.

On the other hand, when releasing the connection state,
If you hit the tip of 12 with a hammer, the wedge body 12 will have a tapered hole 10c
From the through-hole 16 in this state.
10 can be easily pulled out.

In this case, in the present embodiment, the slit hole 12 is formed in the wedge body 12.
Since c is provided, if the inclined surface 12b of the wedge body 12 is hit with a hammer from above, the wedge body 12 can be pulled out from the tapered hole 10c by the elastic force of the wedge body 12 and its reaction force.

FIG. 4 shows a more specific use example of the present invention.

The example shown in the figure shows a case where the joining device of the present invention is used for joining a cylindrical secondary lining form in the axial direction,
In the figure, reference numeral 20 denotes an invert or crown foam hinged by pins 22 and reinforcing steel materials 24 are fixed at relatively small intervals in the axial direction of the foam 20,
A joining flange 26 is fixedly provided at the axial end.

The flange 26 is provided with through holes 28 at appropriate locations.

The plurality of foams 20 are assembled in a ring shape, and are installed so that the flanges 26 are adjacent to each other in the axial direction. In this state, the coupling device of the present invention is used.

To mount the coupling device, insert the shaft portion 10b of the clamp pin 10 into the through hole 28 as in the above-described embodiment, and insert the wedge body into the tapered hole 10c.
It is done by laying out 12, and the cancellation is performed in the same manner as above.

In a state where the coupling device is mounted, a sufficient joining force is obtained, so that even if vibration is applied when the disassembled form is transported on the gantry on the foam 20, the coupling is not loosened. .

Also, the attachment / detachment of the coupling device is performed by
Is performed by hitting the rear end face of the wedge body 12 with a hammer, so that it can be easily performed even in a narrow space where the steel material 24 is fixed.

The square hole 10e provided in the head 10a of the clamp pin 10
Is for lightly press-fitting the wedge body 12 extracted from the tapered hole 10c into the inside thereof to prevent the wedge body 12 from being lost.

Further, in the above embodiment, the elastic tongue 10
Although d is bent in the direction away from each other,
The implementation of the present invention is not limited to this, for example,
It may be bent in the same direction.

Furthermore, the wedge body 12 does not necessarily need to be provided with the slit hole 12c, and may be an ordinary block-shaped one.

FIGS. 5 and 6 show another embodiment of the present invention, and only the features of the embodiment will be described below.

In the embodiment shown in the figure, the clamp pin shown in FIG.
The wedge body 12 has the same structure as that shown in FIG.

In the coupling device configured as described above, the tapered hole 10c
When the joining flange 14 is joined by press-fitting the wedge body 12
This will be sandwiched between the head 10a of the clamp pin 10 'and the flat surface 12a of the wedge body 12, but at this time, the wedge body 12 is provided with a slit hole 12c, and this slit hole 12c is By being press-fitted into the tapered hole 10c, its width is reduced, and an elastic reaction force is generated in the wedge body 12, whereby the joining flange 14 can be firmly fixed.

In this embodiment, the hole formed in the clamp pin 10 'need not necessarily be tapered.

Further, in the above-described embodiment, the case where the present invention is applied to the joint surface between the foams of the secondary lining form is illustrated. However, the present invention relates to the case where the cylindrically assembled forms are connected to each other. Of course, the present invention can be effectively applied to not only the secondary lining but also the casting of concrete in which the disassembling and assembling of the mold is frequently performed.

[Brief description of the drawings]

1 and 2 show an embodiment of the apparatus for joining concrete formwork according to the present invention. FIG. 1 is a perspective view of a clamp pin of the apparatus, and FIG. 2 is a perspective view of the apparatus. FIG. 3 is a perspective view showing an example of a wedge body, FIG. 3 is an explanatory view of a use state of the apparatus, FIG. 4 is an explanatory view of another use state of the apparatus, FIG. 5 and FIG. An example is shown in the fifth embodiment.
The figure is a perspective view of the clamp pin, and FIG. 6 is a perspective view of the wedge body. 10 Clamp pin 10a Head 10b Shaft 10c Tapered hole 10d Elastic tongue 12 Wedge body 12b Inclined surface 12c Slit hole 14 Joint flange 16 Penetration Hole

Claims (4)

(57) [Claims] An apparatus for joining concrete forms, comprising:
The coupling device has a clamp pin and a wedge body. The clamp pin has a head larger than a through hole provided in a joint surface or a connection surface of the mold, and a shaft integrated with the head. Part, a hole formed in the shaft part, and a pair of elastic tongue pieces provided on the lower surface side of the head, wherein the hole is inserted in a state where the shaft part is inserted from one end of the through hole. A concrete formwork joining device, wherein the wedge body is press-fitted into a portion, and the joining surface is sandwiched between the elastic tongue piece and the wedge body to join the formwork. 2. The concrete formwork connecting device according to claim 1, wherein said elastic tongues are formed of a pair of plate-like portions bent in a direction away from each other. 3. The wedge body according to claim 1, wherein the wedge body has a slope inclined downward from one end side to the other end side, and has a slit hole opened at the one end side.
The joining device for a concrete formwork according to item 1. 4. An apparatus for joining concrete forms, comprising:
The coupling device has a clamp pin and a wedge body. The clamp pin has a head larger than a through hole provided in a joint surface or a connection surface of the mold, and a shaft integrated with the head. Part, and a hole formed in the shaft part, the wedge body is a slope inclined downward from one end side to the other end side,
A slit hole opening at the one end side, wherein the wedge member is press-fitted into the hole portion while the shaft portion is inserted from one end of the through hole, and the joining is performed between the head portion and the wedge member. A joining device for a concrete formwork, wherein the formwork is joined by holding a surface therebetween.