JPS6337405Y2 - - Google Patents

Description

[Detailed description of the invention] This invention consists of a lifting jacking device whose lower part is removably attached to an existing concrete wall and a formwork attached to the upper part of the jacking device, and the concrete is placed inside the formwork. After pouring and hardening, the jacking device is extended to raise the formwork, then the lower fixing fitting of the jacking device is removed to shorten the jacking device, and the lower part of the jacking device is fixed to the new existing concrete part. This invention relates to a self-lifting formwork device for repeatedly placing concrete upwards.

The above-mentioned self-lifting formwork device is
30434 is known, in which the upper end of the formwork is connected to the upper end of the jacking device by a pin that loosely fits in the slot so that it can be restrained, and the lower end of the formwork The part can be freely engaged and detached from the jacking device by means of a rod.
After pouring concrete into the formwork, to separate the formwork, first remove the lower rod and allow the upper pin to move within the slot, then remove the rod placed at the top of the formwork. The tip of the hydraulic jack is placed on the solidified concrete surface and the formwork is pressed diagonally backwards, and the pins are moved along the slots to cause them to swing diagonally upwards.

Therefore, with this known formwork device, there is a risk that the cast concrete surface may be damaged by the tip of the hydraulic jack for releasing the mold, and the formwork cannot be separated until the concrete surface has sufficiently hardened. This resulted in poor work efficiency.

The present invention is intended to improve the above-mentioned defects, and its purpose is to be able to separate the formwork without applying external force to the poured concrete, and for this reason, the formwork can be separated before the concrete has sufficiently hardened, and the next step can be carried out. To provide a self-lifting formwork device that can improve construction work efficiency by moving for concrete pouring.

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

In the illustrated self-lifting formwork apparatus of the present invention, the formwork 1 is moved by a pair of lifting jacking devices 2-2, and each jacking device 2 has an outer cylinder 3 and an inner cylinder 4. A hydraulic cylinder 5 is interposed between the outer cylinder 3 and the inner cylinder 4, and the lower end of the cylinder 5 and the lower part of the outer cylinder 3 are connected with a pin 6. The upper end of the cylinder 5 is connected to the lower end of the inner cylinder 4 by a pin 7. Leg tubes 8-8 are fixed to the upper and lower sides of the outer cylinder 3, and a Siebold 9 is inserted through each leg tube 8, and the Siebold 9 connects the outer tube 3 of the hydraulic cylinder 5 to an existing concrete wall. It can be fixed at 10.

The upper and lower parts of each inner cylinder 4 have upper and lower flanges 11a,
11b is provided protrudingly, a long hole 12 is bored in the upper flange 11a, and the outer end of a cross frame 13 which is pivoted in an X shape is pivoted to both the flanges 11a and 11b by pins 14a and 14b. It is worn. The inner end of this cross frame 13 is the formwork 1
Upper and lower flanges 15a, 15 fixed to the upper and lower parts of the
b by pins 14c and 14d, and the pin pivot portion of this upper flange 15a is a long hole 16. Upper flange 11a of inner cylinder 4
The intermediate flange 11c is located at a position slightly downward from
is provided protrudingly, and a mold release jack 17 is provided between the intermediate flange 11c and the upper flange 11a, and the tip of this jack 17
It is coupled with a pin 14a inserted through the elongated hole 12 of 1a. Therefore, when the mold release jack 17 is extended, the pin 14a moves to the upper end of the elongated hole 12 and the cross frame 13 is horizontally flattened. Translate in a direction approaching . Conversely, when the mold release jack 17 is shortened, the pin 14a is inserted into the elongated hole 12.
As the width of the cross frame 13 in the horizontal direction increases as the cross frame 13 moves to the lower end of the cross frame 13, the formwork 1 coupled thereto moves in parallel in the direction of separation from the inner cylinder 4.

Support frames 18-18 for the form 1 are fixed to both sides of the lifting jack device 2-2 of the form 1 and extend downward. Each support frame 18 is made up of a pair of separated narrow plates, and a dummy bolt 19 is attached to the upper position of the support frame 18, a sea bolt 20 is attached to the intermediate position below the form 1, and a jack bolt 21 is attached to the lower position.

An example of construction of an embankment body, etc. in a concrete dam using the self-lifting formwork device as described above will be described below.

1 and 2, reference numeral 10 indicates an existing concrete wall, and the formwork 1 is attached to the existing concrete wall 10 with a support frame 18-18 attached to the Siebold 2.
0-20 and the Siebold 9-9 of the lifting jack device 2-2. Further, a dummy bolt 19 is inserted through the formwork 1 into the upper part of the support frame 18-18. Concrete 10a is placed inside the formwork 1, and when the strength of the concrete reaches a predetermined value, first the Siebolds 20-20 and dummy bolts 19-19 of the support frame 18-18 are removed. Next, as shown in FIG. 3, the mold release jack 17-17 is extended to narrow the horizontal width of the cross frame 13-13, and the formwork 1 is peeled off in parallel from the surface of the poured concrete 10a. Next, the hydraulic cylinder 5 of the lifting jack device 2-2 is extended to raise the formwork 1 to a predetermined height as shown in FIG. after that,
The mold release jacks 17-17 are shortened and the formwork 1 is pushed out via the cross frame 13 toward the surface of the concrete to be newly cast. Next, the Siebold 20 is attached to the support frame 18-18, and the formwork 1
is fixed to the concrete wall 10a. At this time, if the slope of the formwork 1 needs to be adjusted, the support frame 18
-18 jack bolt 21-21 to fix it. After that, the Siebold 9-9 that fixed the outer cylinder 3-3 of the lifting jack device 2-2 to the existing concrete was removed, and the hydraulic cylinder 5-5 of the lifting jack device was operated in the direction of shortening. As shown in FIG. 5, pull up the outer cylinder 3-3. When the outer cylinder is pulled up to a predetermined height, the outer cylinder 3-3 is attached to the upper concrete wall 10 using the Siebold 9-9.
Fixed to. In this state, concrete is placed again, and the above-mentioned operations are repeated to successively place the concrete wall upwards.

As described above, according to the self-lifting formwork device of the present invention, the work of removing and installing Siebolds when replacing the formwork can always be done from a fixed scaffolding, so it is extremely safe and The equipment can be downsized without using formwork unloading equipment such as.

In particular, in the self-lifting formwork device of the present invention, the upper part of the lifting jack device 2 is connected to the cross frame 13.
The cross frame was connected to the formwork 1 through the cross frame, and one end of the cross frame was connected to a mold release jack 17, so that the formwork moved parallel to the concrete pouring surface by the expansion and contraction of the mold release jack. As a result, the formwork can be separated without applying external forces that might damage the poured concrete, and the formwork can be separated before the concrete has sufficiently hardened and the formwork can be separated before the next concrete is poured. It can be raised to improve the work efficiency of wall construction, making it an extremely convenient self-lifting formwork device.

[Brief explanation of the drawing]

Figures 1 and 2 respectively show a front view and a cross-sectional view taken along the line -2 of the lifting jack device of the self-lifting formwork device of the present invention in a shortened state, and Figure 3 shows the mold release from the state shown in Figure 2. Fig. 4 is a side view showing a state in which the formwork is released from the mold via the cross frame by operating the jack, Fig. 4 is a front view showing the state in which the lifting jack device is extended from the state shown in Fig. 3, and Fig. 5 is a front view showing the state in which the lifting jack device is extended from the state shown in Fig. Fourth
FIG. 3 is a front view showing a state in which the outer cylinder of the lifting jack device is pulled up from the state shown in the figure. 1... Formwork, 2... Lifting jacking device, 3...
...Outer cylinder, 4...Inner cylinder, 5...Hydraulic cylinder, 9
...Siebold, 10...Existing concrete wall,
13... Cross frame, 17... Hydraulic cylinder for mold release, 18... Support frame.

Claims (1)

[Claims for Utility Model Registration] (1) Consisting of a lifting jacking device whose lower part is removably attached to an existing concrete wall and a formwork attached to the upper part of the jacking device; After pouring and hardening the concrete, extend the jacking device to raise the formwork, then remove the lower fixing fittings of the jacking device to shorten the jacking device, and connect the lower part of the jacking device to the new concrete. In a self-lifting formwork device for sequentially pouring concrete upward by repeating operations such as fixing it to a section, the upper part of the lifting jack device is connected to the formwork via a cross frame. , one end of the cross frame is connected to a mold release jack,
A self-lifting formwork device, characterized in that the formwork is moved parallel to a concrete placement surface by expansion and contraction of the mold release jack. (2) An inner tube to which the lifting jack device is connected to the end of the cross frame, an outer tube that is removably fixed to an existing concrete wall, and a hydraulic pressure that connects the inner tube and the outer tube. The self-lifting formwork device according to claim 1, which is characterized by comprising a cylinder.