JPH03475B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a self-lifting formwork device used when pouring concrete walls sequentially in the height direction. The removably installed fixed frame and the formwork located above it are extendably connected via a lifting jacking device, and after concrete is poured into the formwork and hardened, the jacking device is extended to raise the formwork. Then, remove the fixing metal fittings of the lower fixing frame of the jacking device to shorten the jacking device, fix the lower fixing frame of the jacking device to the new existing concrete part, and repeat these operations to successively pour concrete upward. This article relates to a self-lifting formwork device for use in manufacturing.

The above-mentioned self-lifting formwork device is
30434 is publicly known. In this known formwork device, the upper end of the jacking device is engaged with the formwork by pins, so that the formwork can swing relative to the jacking device about the pins. After pouring concrete into the formwork, to separate the formwork, place the tip of the hydraulic jack installed at the top of the formwork on the surface of the hardened concrete, press the formwork diagonally backwards, and then press the formwork diagonally backwards. It bounces diagonally upwards with the pin as the center.

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. In addition, when separating the formwork, the formwork only swings and rotates at the top end of the jacking device, and the bottom end of the formwork is not sufficiently separated from the poured concrete wall surface. The wooden formwork cannot be attached to the lower end of the formwork.

The present invention aims to improve the above-mentioned defects, and its purpose is to improve construction work efficiency by separating the formwork and raising it for the next concrete pouring without applying external force to the poured concrete. To provide a self-lifting formwork device capable of attaching a face wood formwork for making joints in concrete pouring joints.

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

The figure shows an example in which the self-lifting formwork device of the present invention is applied to construct a concrete dam, and this device has a formwork sliding fixed frame 2 that is removably installed on an existing concrete wall surface 1. . A pair of flanges 3 are protruded from the front part of the fixed frame 2, and the lower ends of the flanges 3 have a pair of slide guide members 4-4 extending upwardly attached to the pins 5-5.
It is pivoted by. This guide member 4-4
has a concave groove, into which a mold support leg 7-7 integrally fixed to the mold 6 is slidably fitted. Both ends of a hydraulic jack 10 for lifting the formwork are connected between a beam 8 extending laterally at the upper end of the formwork 6 and a beam 9 extending between the guide members 4-4. When the jack 10 is extended, the supporting legs 7-7 and the formwork 6 fixed thereto are extended upward.

As shown in FIG. 1, an inverted V-shaped frame 1 is provided at the rear center portion of the formwork sliding fixed frame 2.
1 is provided protrudingly, and the center portion of a lever 13 bent in a dogleg shape is pivotally attached to the front upper end flange 12 of this frame 11 with a pin 14. The lower end of a rod 15 is pivotally connected to the upper end of this lever 13 by a pin 16, and the upper end of this rod 15 is attached to a beam 1 which is provided between the upper parts of the slide guide members 4-4.
7 with a pin 18. Further, each end of a short and small formwork separation hydraulic jack 19 is connected to the lower end of this lever 13 and the inverted V-shaped frame 11, and when this hydraulic jack 19 is extended, the lever 1
3 rotates around the pin 14, and the slide guide member 4-4 is rotated and raised through the rod 15 around the pivot pin 5-5 with respect to the fixed frame 2. In addition, a scaffolding frame 20-2 is provided at the lower end of the fixed frame 2 and at the upper part of the slide guide member 4-4.
0 is installed.

An example of sequentially constructing a concrete dam upward using the self-lifting formwork apparatus of the present invention configured as described above will be described.

Figure 1 shows the state in which concrete has been poured, with the formwork 6 and the formwork slide fixing frame 2 having anchor bolts 21 buried in the concrete 1 in advance.
It is attached by screwing the dummy bolt 22a and the Siebolds 22b and 22c onto the parts a to 21c.

When the concrete 1 reaches a predetermined strength after curing, the dummy bolts 22a and the Siebolds 22b are removed and the form separation hydraulic cylinder 19 is extended, as shown in FIG. As a result, the rod 15 is pulled diagonally rearward by the lever 13, the slide guide member 4 rotates rearward about the pivot pin 5 with the fixed frame 2, and the formwork 6 attached to the guide member 4 The mold is released from the concrete surface.
In addition, the fixed frame 2 for formwork sliding is Siebold 22c.
remains fixed to concrete 1.

Next, when the formwork lifting hydraulic jack 10 is extended, the formwork support legs 7-7 rise along the sliding guide members 4-4, and as shown in FIGS. 4 and 5, the formwork 6 occupies the ascending position.

After raising the formwork 6 to a predetermined position, when the formwork separation hydraulic jack 19 is shortened, the lower end of the formwork 6 comes into contact with the existing concrete surface as shown in FIG. are installed for subsequent concrete pouring. Next, the formwork 6 is attached to a new Siebold 22 via the existing anchor bolt 21a.
b, and is set to a desired inclination angle by a jack bolt 23 attached to the lower part of the slide guide member 4.

Next, by removing the Siebold 22c that had fixed the fixed frame 2 to the existing concrete wall and shortening the hydraulic jack 10 for raising the formwork,
Guide member 4 coupled to this hydraulic jack 10
At the same time, the fixed frame 2 coupled thereto is pulled upward and assumes the state shown in FIG. In this state, the fixed frame 2 is fixed with the anchor bolts 21b and new Siebolds 22c, and the lifting operation of the formwork is completed. Incidentally, at the time of concrete pouring, anchor bolts 21a and dummy bolts 22a are attached as shown in FIG. By repeating the operation of the self-lifting formwork device as described above, concrete is successively poured upward.

As described above, according to the self-lifting formwork apparatus of the present invention, after pouring concrete into the formwork 6, the formwork 6 is slidably mounted by driving the release jack 19. Since the guide member 4 rotates around the rear end pivot point and is raised from the concrete pouring surface, the formwork can be separated without applying external force that might damage the poured concrete. , the formwork can be separated and raised for the next concrete pouring before the concrete has sufficiently hardened, increasing concrete pouring work efficiency, making it an extremely convenient self-lifting formwork device. can.

Furthermore, in the present invention, since the formwork 6 is raised from the concrete placement surface by the rotation of the guide member 4, the formwork located above the guide member 4 must be sufficiently separated from the concrete placement surface. Therefore, it is possible to attach a face wood formwork to the inner surface of the formwork to insert joints into the concrete pour joints.

It should be noted that the present invention is not limited to the above-mentioned embodiments, and can be modified in various ways. For example, the lower end of the formwork lifting jack 10 may be changed to
Instead of the beam 9 installed across the frame 9, it is also possible to attach it directly to the formwork slide fixing frame 2.

[Brief explanation of the drawing]

FIG. 1 is a side view showing concrete being poured using the self-lifting formwork device of the present invention, FIG. 2 is a plan view of the main parts of the device shown in FIG. 1, FIGS. 3 and 4, Figures 6 and 7 are side views showing the self-lifting operation of the apparatus of the present invention for pouring the next stage of concrete from the state shown in Figure 1, and Figure 5 is a side view of the apparatus of the present invention shown in Figure 4. FIG. 3 is a plan view of main parts in the illustrated state. 1... Existing concrete, 2... Fixed frame for formwork slide, 4... Guide member for slide, 6...
Formwork, 7... Formwork support leg, 10... Formwork lifting jack, 13... Bending lever, 15... Rod.

Claims (1)

[Scope of Claims] 1. A formwork sliding fixed frame that is removably installed on an existing concrete wall using fixing fittings, and a sliding guide whose lower end is connected to the fixed frame with a pin and extends upward. a member, a formwork having legs slidably engaged with the guide member, and disposed between the formwork and the guide member or between the formwork and the fixed frame so that the formwork can be freely extended. A lifting jack device connected to the guide member, a means for connecting the guide member to the fixed frame in a freely undulating manner around the pin at the lower end thereof, and a mold release jack for driving the undulating connecting means. Self-lifting formwork equipment. 2. The undulation connecting means consists of a rod and a bending lever, whose one end is pivotally connected to each other, the other end of the rod is pin-coupled to the guide member, and the intermediate part of the lever is pivoted to the fixed frame. Claim 1, characterized in that the lever is pivotally mounted so as to be freely movable, and the other end of the lever is connected to one end of the mold release jack.
The self-lifting formwork device described in Section 1.