JPH0454267Y2 - - Google Patents

Description

[Detailed Description of the Invention] <<Industrial Application Field>> This invention relates to a sliding formwork device used for constructing large concrete structures such as dams.

<<Prior Art>> As a formwork used for constructing large concrete structures such as dams, there is a sliding formwork device having the following structure.

This formwork device has a frame whose lower end is removably installed on the existing finished concrete wall on the lower side, and whose upper end is fixed to the concrete surface via a hydraulic jack. It consists of a formwork that is arranged at a predetermined interval between them to define a gap.

Then, concrete is poured into the inner gap of the formwork to join the finished concrete wall surface that is continuous to the upper part of the finished concrete wall surface, and then the frame is separated from the finished concrete wall surface,
A winch or the like is used to pull it up and move it to the new finishing concrete placement location.

《Problems to be solved by the invention》 However, with the formwork device of this structure, the weight per piece is extremely heavy and it is installed on a steep slope. The contact friction between the concrete wall and the concrete wall increases,
Hoisting with a winch required considerable horsepower and took a considerable amount of time, resulting in low work efficiency.

This idea is intended to solve the above problems, and its purpose is to reduce the contact friction between the formwork and the concrete wall surface, shorten the time during lifting, and improve work efficiency. A sliding formwork device is provided.

<Means for Solving the Problems> In order to achieve the above object, this invention has one end removably installed on the existing finished concrete wall surface, and the other end fixed to the concrete surface using a hydraulic jack. It consists of a frame supported by the frame and a formwork that is placed at a predetermined distance from the sacrificial concrete surface to define a gap, and concrete is poured into the inner gap of the formwork to form the existing structure. A sliding formwork device that connects a continuous finished concrete wall surface to a finished concrete wall surface, and then detaches the frame from the finished concrete wall surface and moves it to a new finished concrete placement position, the frame Wheels are provided on one end and in the center so that they can move toward and away from the existing finished concrete wall surface, and a window that can be opened and closed is provided at a position facing the wheels on the center side of the formwork. The main points are as follows.

《Operation》 When moving, each wheel is brought into contact with the concrete wall surface and the formwork is moved while floating above the concrete wall surface, thereby reducing the frictional force according to the contact area between the two wheels and reducing the driving power. .

<<Example>> Hereinafter, an example of this invention will be described in detail using the drawings.

In FIGS. 1 and 2, reference numeral 1 indicates sacrificial concrete poured at a predetermined slope, and numeral 2 denotes finished concrete poured on the sacrificial concrete 1 from the bottom at a predetermined pitch.

The sliding formwork device 3 basically has one end removably installed on the wall surface of the existing finished concrete 2, and the other end fixed to the wall surface of the concrete concrete 1 via a hydraulic jack 9. A large number of horizontal frames 5 arranged orthogonally at the bottom of the frame 4
It consists of a formwork 6 supported through.

The lower end of the frame 4 has a plurality of Siebolds 7
It is connected to an anchor bolt 8 buried inside the existing concrete 2 via. Further, one end of a hydraulic jack 9 is rotatably connected to the upper end side of the frame 4, and by touching the tip of the hydraulic jack 9 to the surface of the concrete 1, the whole is discarded and placed on the concrete 1 with a predetermined gap d. maintain and support.

By pouring concrete into the gap d formed between the formwork 6 and the wall surface of the sacrificial concrete 1, the finished concrete continuous to the wall surface of the existing finished concrete 2 is poured. Further, a dummy bolt 10 is provided protruding from the upper end of the frame 4, and this dummy bolt 10 is coupled to the aforementioned anchor bolt 8 protruding from the inside of the formwork 6.

Therefore, concrete is placed in the gap d, and in a solidified state, the dummy bolt 10 is
By pulling out the anchor bolts 8, only the anchor bolts 8 are buried in the finished concrete 2, and by screwing into the anchor bolts 8 the Si bolts 7 protruding from the lower side of the frame 4 after being pulled up, the frame 4 The bottom edge of can be re-fixed.

Wheels 11 and 12 are provided at the lower side and in the center of the frame 4 so as to be able to move toward and away from the wall surface of the existing finished concrete 2, and at positions facing the wheels 12 at the center of the formwork 6. is provided with a window portion 13 that can be opened and closed.

As shown in FIG. 2, each wheel 11, 12 is rotatably supported by a support yoke 15 provided at the lower end of a screw-in jack 14 that vertically moves through the frame 4. In the fixed state of the formwork device 3 shown in FIG. 1, the jack 14 is pulled up, the wheels 11 and 12 are pulled up,
It is in a state separated from the surface where the finishing concrete 2 is placed.

In addition, when the central wheel 12 is in a raised state, the window portion 13 is closed by a sliding lid 16.
This is to prevent leakage of concrete poured on the inner side of the formwork 6.

In order to move the formwork device 3 upward after the poured concrete has hardened and the construction of the new finished concrete 2 wall has been completed, the following steps are performed.

First, the upper end of the frame 4 is connected to the wire of a hoisting winch (not shown), and after ensuring a supported state, the hydraulic jack 9 is reduced and rotated to a position where it does not interfere with the movement work, The Siebold 7 and dummy bolt 10 are pulled out from the anchor bolt 8, and other bolts buried in the wall surface of the finished concrete 2 are pulled out.

At the same time, the lid 16 that closes the window 13 formed in the center of the formwork 6 is removed by sliding it in a direction perpendicular to the plane of the paper, and the wheels 11 and 12 are removed with the concrete wall visible. The supporting jack 14 is lowered and the wheels 11 and 12 are installed on the wall surface of the finished concrete 2.

In the installed state, the formwork device 3 is used for finishing concrete 2
The total load is lifted from the wall of each wheel.
1 and 12.

Note that a plurality of wheels 11 and 12 are arranged in a direction perpendicular to the plane of the drawing to appropriately distribute the load.

If the winch is driven to wind up the wire in this state, there will be a contact situation between the formwork device 3 and the wall surface of the existing finished concrete 2 due to rolling friction with the wheels 11 and 12. The entire formwork device 3 can be pulled up to the upper side while the friction caused by surface contact with the wall surface is greatly reduced.

After that, while screwing the Siebold 7 into the anchor bolt 8, the hydraulic jack 9 is discarded, and it is installed on the surface of the concrete 1 and stretched, and then the wheel 1
1 and 12, the setting of the formwork device 3 is completed again as shown in FIG.

<<Effects>> As explained in detail using the examples above, in the sliding formwork device according to this invention, only the contact pressure due to rolling friction between the wheels and the finished concrete wall is applied, so the drive power of the winch is reduced. With a winch of the same horsepower, the travel time of the formwork device can be drastically reduced.

[Brief explanation of the drawing]

FIG. 1 is a side view of the formwork device of this invention, and FIG. 2 is a partially enlarged view showing details of wheels provided in the formwork device. 1... Discarded concrete, 2... Finished concrete, 3... Formwork equipment, 4... Frame, 6...
Formwork, 11, 12...Wheel, 13...Window part, 16
……lid.

Claims (1)

[Scope of utility model registration request] A frame whose one end is removably installed on an existing finished concrete wall and whose other end is fixed to the concrete surface via a hydraulic jack is supported by the frame and maintained for a predetermined period of time between the concrete surface and the concrete surface. and a formwork arranged to define a gap, concrete is poured into the inner gap of the formwork to connect a finished concrete wall that is continuous with the existing finished concrete wall, and then the frame is finished. A sliding formwork device that is detachable from a concrete wall surface and moved to a new finishing concrete placement position, the frame being arranged at one end side and in the center so as to be able to move toward and away from the existing finished concrete wall surface. 1. A sliding formwork device, characterized in that the formwork is provided with wheels, and an openable and closable window is provided at a position facing the wheels on the center side of the formwork.