JP6966853B2 - How to place concrete on an inclined surface and mobile formwork equipment - Google Patents

Description

The present invention relates to a method of placing concrete on an inclined surface such as a dam body and a mobile formwork device used for the method.

For example, when concrete is placed on the surface of the ground (rock) when constructing a dam body or spillway, which is a dam structure, when concrete is placed on an inclined surface, it is almost parallel to the inclined surface. Install the formwork and pour concrete inside the formwork.

The formwork is lifted and installed by the crane within the working radius of the crane, but outside the working radius of the crane, the plywood is manually transported and installed while assembling the formwork.
Further, in the case of a large formwork, since the weight is large, the installation work with a crane is indispensable, but the lifting work cannot be performed outside the working radius of the crane.

Patent Document 1 discloses a method of placing concrete inside a formwork while sequentially moving the formwork upward along an inclined construction surface by using a mobile formwork device.
This mobile formwork device has a guide rail arranged on an inclined surface along an inclined direction, a formwork slidably suspended and supported by a guide rail via a moving body, and as a means for raising and lowering the formwork. Includes a towing jack provided at the top of the guide rail.

Japanese Patent Application Laid-Open No. 2003-064869

However, the work of installing the formwork outside the working radius of the crane is inefficient and the process is delayed. Moreover, it is difficult to use a large formwork.

Since the technique of Patent Document 1 suspends and supports the formwork on the guide rail, it is difficult to stably move the formwork and stably support the formwork. Therefore, it is difficult to obtain uniform finishing accuracy on the entire inclined surface, and it is considered that the leveling work takes time accordingly.

The present invention has been made in view of such an actual situation, and an object of the present invention is to provide a concrete placing method for an inclined surface, which can be carried out more efficiently and with high accuracy, and a mobile formwork device used therefor. do.

In order to solve the above problems, concreting process of the inclined surface according to the present invention comprises a rail disposed along the inclination direction to the inclined surface, and formwork movable on the rail by the wheel, the Using the mobile formwork device including, concrete is poured while moving the formwork from the concrete construction span below the inclined surface to the concrete construction span above the inclined surface , and the rail is the mold. It is placed below the face plate of the frame at a position where it is buried by the concrete to be cast, and when the formwork is moved, the upper end side of the formwork in the tilting direction is moved on the rail, and the formwork is tilted. The lower end side in the direction is characterized by moving on the cast concrete.

The method for placing concrete on an inclined surface according to the present invention also includes a mobile formwork device including a rail arranged on the inclined surface along the inclined direction and a formwork movable on the rail by wheels. Using, concrete is placed while moving the formwork from the concrete construction span below the inclined surface to the concrete construction span above the inclined surface, and when the concrete is placed, the upper end of the formwork in the inclined direction is used. The portion side is characterized by being supported on the rail.
The method for placing concrete on an inclined surface according to the present invention also includes a mobile formwork device including a rail arranged on the inclined surface along the inclined direction and a formwork movable on the rail by wheels. Using, concrete is placed while moving the formwork from the concrete construction span below the inclined surface to the concrete construction span above the inclined surface, and after the concrete is placed, the face plate is removed from the formwork. It is characterized by smoothing the surface of the cast concrete.

The present invention also includes a rail arranged on the inclined surface along the inclined direction and a formwork movable on the rail, and the concrete construction above the inclined surface is sequentially started from the concrete construction span below the inclined direction. Provided is a mobile formwork device for moving the formwork to a span and placing concrete on an inclined surface.
Here, the rail is arranged below the face plate of the formwork at a position where it is embedded by the concrete to be cast, and the formwork is on the upper end side in the inclination direction and can travel on the rail. It is characterized by having a flexible wheel and a wheel that is on the lower end side in the inclined direction and can run on the cast concrete.

According to the present invention, work efficiency can be improved by using the mobile formwork device. Further, by moving the formwork on the rails by wheels, the formwork can be stably moved and stably supported, and the finishing accuracy can be improved.
In particular, by constructing the rail to be "buried" in concrete, restrictions on the installation and movement of the formwork are reduced, which also contributes to the improvement of work efficiency.

A vertical sectional view of an inclined surface showing a method of placing concrete on an inclined surface using a mobile formwork device as an embodiment of the present invention. A view of arrow 1 in FIG. Longitudinal section of the inclined surface after concrete placement Longitudinal section of the inclined surface when leveling concrete Vertical cross-sectional view of the inclined surface when moving the formwork

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a vertical cross-sectional view of an inclined surface (construction surface) showing a method of placing concrete on an inclined surface using a mobile formwork device as an embodiment of the present invention. FIG. 2 is a view taken along the line A of FIG.

The inclined surface 100 is a concrete construction surface of the ground (rock), and in this construction, concrete is poured sequentially from the concrete construction span below the inclined surface to the concrete construction span above the inclined surface.
FIG. 1 shows a state immediately before the concrete is placed and solidified in the concrete construction span S1 and the concrete is placed in the next concrete construction span S2.

The mobile formwork device 1 according to the present embodiment will be described with reference to FIGS. 1 and 2.
The mobile formwork device 1 includes a rail 10 arranged on an inclined surface 100 along an inclined direction, a formwork 20 that can move above the rail 10 along the rail 10, and a formwork 20 along the rail 10. Includes a traction device 30 that can be moved from bottom to top.

The rail 10 is made of, for example, channel steel, and is laid on a support 11 made of an angle member or the like, which is erected side by side in the inclined direction on the ground of the inclined surface 100 with the groove portion facing up.

The formwork 20 is composed of a support frame 21 forming the formwork body and a removable face plate (panel foam) 22 supported below the support frame 21 by the support frame 21. The support frame 21 is composed of a lower vertical end thickness 21a and an upper horizontal end thickness 21b intersecting the support frame 21. The face plate 22 is divided into a plurality of members (a plurality of horizontally long panels) at least in the extending direction of the vertical end thickness 21a in order to facilitate attachment / detachment to / from the support frame 21 (vertical end thickness 21a).

Jack devices 23 and 24 are fixed downward on the front end side (upper end side in the inclined direction) and the rear end side (lower end side in the inclined direction) of the support frame 21, respectively. Further, the jack device 25 is also fixed downward to the intermediate portion in the front-rear direction (intermediate portion in the inclined direction) of the support frame 21. Each of the downward output rods of these jack devices 23, 24, and 25 penetrates the form 20.

The downward output rod 23a of the jack device 23 on the front end side has a wheel 26 at the lower end thereof. The wheel 26 can travel on the rail 10 guided by the wheel 26.
The downward output rod (not shown) of the jack device 24 on the rear end side has wheels 27 at its lower end. The wheels 27 can travel on the cast concrete 101.

Therefore, the formwork 20 includes wheels 26 and 27 for traveling, and jack devices 24 and 25 capable of raising and lowering the formwork 20 itself in the demolding direction (direction away from the concrete surface).

Further, the downward output rod 25a of the jack device 25 in the middle in the front-rear direction is connected to and supported by a support member (separator) 28 provided on the inclined surface 100 at the time of placing concrete.
The support member 28 is, for example, a reinforcing bar driven into the ground of the inclined surface 100, and an anchor bolt (male screw member) 28a is held on the upper end side.
A female screw is formed at the lower end of the output rod 25a. For example, this female thread is detachably provided as a female thread member at the lower end of the output rod 25a. By screwing this into the screw of the anchor bolt 28a, the jack device 25 and the support member 28 are connected.

The traction device 30 has a wire 31 that connects a fixed portion (not shown) on the top side of the inclined surface 100 and a front end portion side of the formwork 20 (support frame 21), and a chill hole 32 interposed between the wires 31. It is composed of and. The chill hole 32 can pull the formwork 20 from the bottom to the top along the inclination direction by shortening the length of the wire 31 by operating the lever. A winding winch or the like can also be used as the traction device. It can also be self-propelled without using a traction device.

Next, the concrete placing work of the inclined surface 100 using the above-mentioned mobile formwork device 1 will be described.
When concrete is placed in the concrete construction span S2 one level higher after the concrete is placed in the concrete construction span S1 below in the inclined direction, the formwork 20 is moved to the position shown in FIG. 1 and installed.

In this installation position, the front end side of the formwork 20 is supported on the rail 10 via the wheels 26, and the rear end side of the formwork 20 rests on the concrete 101 on which the face plate 22 has been placed. It is supported in a closed state (close contact state).

Further, at the same time as the installation of the formwork 20, the jack device 25 at the intermediate portion in the front-rear direction of the formwork 20 and the support member 28 are connected.
As a result, the intermediate portion in the front-rear direction of the form 20 is supported by the support member 28 by connecting the jack device 25 to the support member 28.

With the formwork 20 installed as described above, concrete (in the case of dam concrete, relatively hard kneaded concrete) is placed in the concrete construction span S2 between the ground of the inclined surface 100 and the formwork 20. Place.
As a result, the state shown in FIG. 3 is obtained. Therefore, since the rail 10, the support base 11, and the support member 28 in the concrete construction span S2 are retained, they are buried in the concrete as they are.

After placing the concrete, compaction is performed on the top end side of the concrete construction span S2 using a vibrator or the like.
Then, the mold 20 is removed from the mold 20 and the face plate 22 is removed for the smoothing work of the surface in contact with the mold 20 after the compaction until the mold is completely solidified.

That is, as shown in FIG. 4, the output rods of the jack devices 23, 24, and 25 are extended and operated to jack up the form 20. That is, the formwork 20 is moved in a direction away from the concrete surface. Then, a space is secured between the face plate 22 and the concrete surface, and the face plate 22 is removed from the support frame 21. As a result, the surface of the cast concrete (the surface in contact with the formwork 20) can be leveled, so that the leveling work such as tapping lightly is performed. The vertical end thickness 21a and the horizontal end thickness 21b of the support frame 21 are provided with scaffolding for work (not shown).

After that, the jack device 25 and the support member 28 are provided by unscrewing the anchor bolt (male screw member) 28a on the support member 28 side and the screw member because they are provided at the lower ends of the output rod 25a on the jack device 25 side. The tip of the output rod 25a of the jack device 25 is pulled out from the concrete while the output rod 25a of the jack device 25 is shortened and operated. As a result, a hole is created on the concrete surface, and this hole is filled with mortar or the like.

The leveling work is performed for the following reasons.
In the case of dam concrete, relatively hard concrete is poured. When the formwork is set in an inclined shape, concrete is placed and compacted, air floats on the inclined surface. In the case of a vertical formwork, air can escape, but in the case of an inclined formwork, air tends to collect at the contact portion with the formwork, and the surface becomes dirty due to unevenness. Therefore, after the concrete is placed, the face plate 22 is removed and the surface is leveled at the time of compaction until the concrete is completely solidified.

After the concrete placement of the concrete construction span S2 is completed, as shown in FIG. 5, the formwork 20 is moved to the next concrete construction span S3 in a jack-up state with the face plate 22 removed.
That is, the formwork 20 is towed by the wire 31 by operating the chill hole 32 constituting the towing device 30.
At this time, the front end side of the formwork 20 is guided by the wheels 26 on the rail 10 and travels, and the rear end side of the formwork 20 travels on the concrete 102 already cast by the wheels 27.

After moving the concrete construction span S3 to a predetermined position, the jack device 25 in the middle in the front-rear direction is connected to the support member 28 and the face plate 22 is attached to the support frame 21 of the formwork 20 in the same manner as in FIG. Then, the jack devices 23, 24, and 25 are jacked down to complete the installation of the form 20.
After that, the concrete placing work is performed in the same manner.

According to the present embodiment, the mobile formwork device 1 is used to cast concrete while moving the formwork 20 from the concrete construction span below the inclined surface to the concrete construction span above the inclined surface in sequence. As a result, work efficiency can be improved.
Further, by moving the formwork 20 on the rail 10 by the wheels 26, the formwork 20 can be stably moved and stably supported, and the finishing accuracy can be improved.
Further, in particular, by burying the rail 10 in concrete, restrictions on the installation and movement of the formwork 20 are reduced, which also contributes to the improvement of work efficiency.

Further, according to the present embodiment, at the time of placing concrete, the intermediate portion of the formwork 20 in the inclined direction is supported by the support member 28 provided on the inclined surface, so that the formwork 20 is supported more stably. be able to.

Further, according to the present embodiment, after the concrete is cast and before it is completely solidified, the formwork 20 is removed from the formwork 20 and the face plate 22 is removed from the formwork 20 so as to be in contact with the formwork 20. The concrete surface can be leveled.
Along with this, when the formwork 20 is moved, the formwork 20 may be moved with the face plate 22 removed from the formwork 20, and the face plate 22 may be attached to the formwork 20 after the movement.

Further, the mobile formwork device 1 used in the present embodiment includes a rail 10 arranged on the inclined surface 100 along the inclined direction, and a formwork 20 movable on the rail 10 by wheels 26. The form 20 includes jack devices 23, 24, and 25 capable of raising and lowering the form itself in the demolding direction, and has the wheels 26 at the lower end of the jack device 23. By using the mobile formwork device 1 having such a configuration, it is possible to easily realize the movement of the formwork 20 in the inclined direction along the concrete surface and the movement in the demolding direction in contact with and separated from the concrete surface.

In addition, the illustrated embodiment is merely an example of the present invention, and the present invention includes various improvements and improvements made by those skilled in the art within the scope of the claims, in addition to those directly shown by the described embodiments. It goes without saying that it involves changes.

1 Mobile formwork device 10 Rail 11 Support base 20 Formwork 21 Support frame 21a Vertical end thickness 21b Horizontal end thickness 22 Face plate (panel foam)
23, 24, 25 Jack device 23a, 24a, 25a Output rod 26, 27 Wheel 28 Support member (separator)
28a Anchor bolt 30 Towing device 31 Wire 32 Chill hole 100 Inclined surface 101, 102 Pre-cast concrete

Claims (5)

Using a mobile formwork device that includes rails that are arranged along the slope direction on an inclined surface and a formwork that can be moved by wheels on the rails.
While moving the formwork from the concrete construction span below the slope to the concrete construction span above the slope, concrete is placed.
The rail is placed below the face plate of the formwork at a position where it is buried by the concrete to be cast.
When the formwork is moved, the upper end side of the formwork in the inclined direction is moved on the rail, and the lower end side of the formwork in the inclined direction is moved on the cast concrete. How to place concrete on the surface. Using a mobile formwork device that includes rails that are arranged along the slope direction on an inclined surface and a formwork that can be moved by wheels on the rails.
While moving the formwork from the concrete construction span below the slope to the concrete construction span above the slope, concrete is placed.
A method for placing concrete on an inclined surface, wherein the upper end side of the formwork in the inclined direction is supported on the rail at the time of placing concrete. Using a mobile formwork device that includes rails that are arranged along the slope direction on an inclined surface and a formwork that can be moved by wheels on the rails.
While moving the formwork from the concrete construction span below the slope to the concrete construction span above the slope, concrete is placed.
A method for placing concrete on an inclined surface, which comprises removing the face plate from the formwork after placing concrete and leveling the surface of the placed concrete. Includes rails that are placed along the slope direction on the slope and formwork that can move on the rails.
A mobile formwork device for moving the formwork from the concrete construction span below the inclined direction to the concrete construction span above the inclined surface and placing concrete on the inclined surface.
The rail is placed below the face plate of the formwork at a position where it is buried by the concrete to be cast.
The formwork is characterized by having a wheel that is on the upper end side in the inclination direction and can run on the rail, and a wheel that is on the lower end side in the inclination direction and can run on the cast concrete. Mobile formwork device. The formwork is provided with a jack device that can raise and lower the formwork itself in the demolding direction.
The mobile formwork device according to claim 4, wherein the wheel is provided at the lower end of the jack device.

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