JP3063548B2 - Formwork method and equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a formwork method and apparatus applied to a so-called jump-up method in which concrete is cast while diverting formwork panels.

[0002]

2. Description of the Related Art As a formwork method for constructing an RC tower-like structure such as a pier, silo, chimney, tank or core of a skyscraper, a slip form method and a jumping or jump-up method are known. ing.

[0003] The slip-form method is a method in which concrete is continuously poured while the form panel is slid upward, and concrete with few joints can be constructed in a short time.

[0004] On the other hand, the jumping method cannot be performed in a shorter time than the slip form method. However, since the concrete is poured while the form panels are sequentially rearranged upward without sliding, the concrete method is not used. The finish on the concrete surface is good.

In the conventional jumping method, for example, a form panel is set at a predetermined height, and concrete is poured into the form panel. Next, the form panel is released from the hardened concrete surface, and then a reaction force is applied to the already formed lower concrete surface to raise the form panel together with the work platform. Finally, the form panel is set again to prepare for the next concrete placement.

In another construction method, after placing concrete, a reaction force is applied to the hardened concrete surface to raise only the work scaffold, and then the formwork panel is removed from the concrete surface. Then, the formwork panel is raised by the same height as the previously raised working scaffold to prepare for the next concrete casting.

[0007]

However, in any of the construction methods, after the mold panel is removed from the concrete surface, the mold panel is diverted as the upper mold panel. The operation is a critical step in the overall process.

[0008] Therefore, if an attempt is made to shorten the overall construction period, the timing of releasing the form panel tends to be inevitably earlier, and thus the concrete surface is exposed in an insufficiently cured state, and the shrinkage due to drying and shrinkage occurs. Cracks and the like may occur.

[0009] As described above, the jumping method is capable of finishing the concrete surface better than the slip-form method, but the degree of the finish is inferior to that of the normal formwork method under the demand for shortening the work period. Had the problem of doing so.

Further, in any of the methods, since the form panel is diverted as it is, after removing the form panel, the cleaning, cramping, repairing, building adjustment, etc. are performed until concrete is placed on the next lift. Work is required, and the construction period is inevitably lengthened.

The present invention has been made in view of the above-mentioned circumstances, and provides a formwork method and apparatus capable of extending a period of formwork panels without affecting the entire process and sufficiently curing concrete surfaces. The purpose is to provide.

Another object of the present invention is to provide a formwork method and apparatus capable of shortening the entire steps of the jump-up method.

[0013]

In order to achieve the above object, a formwork method according to the present invention is characterized in that a support attached to a work scaffold is fixed to a concrete wall by using a predetermined fixing means. And a formwork panel of a predetermined lift is slidably supported by a supporter connected to the support body so as to be movable up and down, and in this state, concrete is poured into the formwork panel. Curing the concrete until a predetermined strength is developed in the concrete, a step of removing the form panel of the lift preceding the predetermined lift, and after the concrete is hardened, the support is fixed to the concrete wall surface by predetermined fixing means. Removing the fixing means that fixed the support while fixing the support, and raising the work scaffold and the support by reacting to the support, Fixing the support to the concrete wall surface again using the fixing means, removing the fixing means fixing the support, and fixing the support to the form panel of the predetermined lift and the form panel of the next lift And raising the supporting structure by applying a reaction force to the support while sliding on the back surface of the support.

Further, in the formwork apparatus according to the present invention, a support for supporting the formwork panel is provided on the back side of the formwork panel arranged along a predetermined design wall surface. The formwork panel and the supporter are slidably configured, and a lifting mechanism that can move up and down along a predetermined supporter attached to a work platform is connected to the supporter, and the supporter is connected to the supporter. And a fixing means for detachably fixing the support to the concrete wall surface.

[0015]

According to the formwork method and the apparatus of the present invention, first, the support attached to the work scaffold is fixed to the concrete wall surface by using a predetermined fixing means, and the support is connected to the support so as to be able to move up and down. A form panel of a predetermined lift is slidably supported by a worker, and concrete is poured into the form panel in this state.

Next, the cast concrete is cured until it reaches a predetermined strength. During the curing period, reinforcement for the next lift and building of the formwork panel should be performed.

Next, prior to changing the work scaffold, the form panel of the lift preceding the above-described predetermined lift (the lift located below the predetermined lift) is removed. The form panel of the predetermined lift is left as it is without being removed from the mold.

After the concrete is hardened, the support is fixed to the concrete wall surface by using a predetermined fixing means, and the fixing means on the support side is removed, and the load of the working scaffold including the support is reduced by the support via the elevating mechanism. Be supportive.

Next, the lifting / lowering mechanism is operated so as to move relatively downward with respect to the support. Then, the lifting mechanism raises the work platform while applying a reaction force to the shoring connected thereto.

After the working scaffold is raised to a predetermined height in this manner, the support is fixed to the concrete wall surface by using the fixing means on the support side, and the fixing means on the support side is removed. Is supported by the support via the lifting mechanism.

Next, the elevating mechanism is operated so as to move upward relative to the support. Then, the lifting mechanism pushes up the support while applying a reaction force to the support, but the support rises while sliding on the back surface of the form panel, so that the form panel remains stationary.

In this way, the shoring is raised by the same height as the previously raised working scaffold, and is ready for the next concrete casting.

[0023]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a formwork method and apparatus according to the present invention.

FIG. 1 is a flowchart showing the formwork method of this embodiment, and FIG. 2 is a vertical sectional view showing a formwork apparatus used in the formwork method of this embodiment. As can be seen from FIG. 2, the formwork apparatus 1 of the present embodiment has a support 3 that slidably supports the formwork panel 2 on the back side of the formwork panel 2 disposed along a predetermined design wall surface. On the other hand, a lifting mechanism 6 that can move up and down along a support 5 attached to the work scaffold 4 is connected to the support 3 via a connecting member 7.

The form panel 2 is constructed by attaching a horizontal flap 12 to the back of a weir plate 11 in contact with concrete.
The weir plate 11 may be plywood and the horizontal flaps 12 may be wooden square members, or they may be integrally formed as a metal foam.

An anchor 13 as a fixing means is attached to the form panel 2 in advance on the casting side. After the concrete has been cast, it is buried in the concrete to exhibit a predetermined fixing strength. A predetermined mounting hardware, for example, a sea bolt 14 is fastened to the anchor 13 so as to be able to support the load of the support and the support.

The support 3 is preferably formed of, for example, a square steel pipe. The support 3 is provided with a predetermined hole (not shown) through which the seabolt 14 penetrates.

The support 5 is a member for lifting, called a gin pole, and guides the lifting movement of the lifting mechanism 6 between the flanges of the H-shaped steel 15 fixed to the working scaffold 4.
A rod 16 having a diameter of about 0 mm is provided. Further, a predetermined hole (not shown) for penetrating the seabolt 14 is provided at the lower end of the support 5.

The elevating mechanism 6 is preferably a so-called reciprocating center hole jack which elevates the rod 16 as a reaction force. That is, the lifting mechanism 6 acts to push up the support 3 by applying a reaction force to the rod 16 when the lifting mechanism 6 is relatively raised with respect to the support 5, while the lifting mechanism 6 3 acts to push up the rod 16 and, consequently, the work platform 4.

Next, the operation of the formwork method and apparatus of this embodiment will be described with reference to the flowchart of FIG.

First, as shown in FIG. 3A, concrete is poured into the form panel 2 built in a predetermined lift 23 (step 101). In this state, the seabolt 14 is fastened to the anchor 13 at the lower end of the support 5, and the support 5 is fixed to the concrete wall surface. An anchor 13 is attached to the form panel 2 in advance on the casting side.

Next, as shown in FIG. 3 (b), the concrete is cured, for example, for about three days until the cast concrete exhibits a predetermined strength (step 102).

On the other hand, during this curing period, as shown in FIG. 3 (c), the reinforcement of the next lift 24 and the installation of the form panel 2 are performed (step 103). Note that this step may be completed by the shoring raising step (step 108) described later.

As shown in the figure, the form panel 2 of the lift preceding the lift 23 (the lift 22 located below the predetermined lift 23) is removed (step 10).
4). It is preferable that such a demolding operation is performed immediately before changing the work scaffolding, and the curing period of the concrete surface is extended as much as possible. The form panel 2 of the lift 23
Is kept without being removed. Further, it is preferable that the removed form panel 2 be used for cleaning, cramping, repair, and the like, and be diverted as a form panel of a lift next to the lift 24 built in this process.

After the strength is developed, as shown in FIG. 4 (a), the support bolt 5 on the side of the support 3 is fastened to the anchor 13 and the support 3 is fixed to the concrete surface.
Of the work scaffold 4 including the support 5 is supported by the support 3 via the lifting mechanism 6 (step 105). A guide roller 31 is provided on the support 5 to prevent the contact between the support 5 and the concrete surface due to the removal of the sea bolt 14 on the support 5 side, and to smoothly carry out a work for raising a work scaffold described later. It is good to keep.

Next, as shown in FIG. 4B, the lifting / lowering mechanism 6 is operated so as to move relatively downward with respect to the rod 16 of the support 5 (step 106). Then, the elevating mechanism 6 pushes up the work scaffold 4 while applying a reaction force to the support 3 connected via the connecting member 7.

After the working scaffold 4 has been raised to a predetermined height in this way, as shown in FIG. 5 (a), the sea bolt 14 on the support 5 side is again tightened to the anchor 13 and the support 5 To the concrete wall and support 3
The sea bolt 14 on the side is removed, and the load of the support 3 is supported by the support 5 via the lifting mechanism 6 (step 107).

Next, as shown in FIG. 5B, the lifting / lowering mechanism 6 is operated so as to move upward relative to the support 5 (step 108). Then, the lifting mechanism 6
Pushes up the support 3 while applying a reaction force to the support 5. Here, since the shoring 3 rises while sliding on the back surface of the form panel 2, the form panel 2 remains stationary.

In this way, the shoring 3 is raised by the same height as the work scaffold which was raised earlier, and the next lift 2
Prepare for concrete placement of 4.

By repeating the above steps, a concrete wall having a desired height can be constructed.

As described above, according to the formwork method and apparatus of this embodiment, instead of using the form panel of the lower lift as it is as the form panel of the next lift, another form panel is built. Since the support is lifted while sliding only the support to the rear surface of the form panel, the form panel can be kept on the concrete surface for a longer time than the conventional method.

That is, in the conventional jump-up method, the period of time during which the form is kept is from the time when the concrete is cast to the time when the strength of the concrete is developed and the refilling becomes possible, for example, three days. In the formwork apparatus according to the present embodiment, the period is at least a period (for example, three days) from the time when the concrete of the next lift is cast to the time when the predetermined strength is developed, which is two times as long as the conventional one.
It will be about twice as long.

Accordingly, the concrete surface is sufficiently cured, and there is almost no possibility that cracks or the like will occur as in the prior art, and a finish equivalent to that of a normal stationary form can be obtained.

Further, according to the formwork method and apparatus of the present embodiment, since the removed formwork panel is not diverted to the upper lift as it is, the formwork panel is once carried out to another work place, and Washing, spasms, panels in place
Work such as repair can proceed in parallel. Also, the adjustment work after the form panels are built can be performed during the concrete curing of the lower lift. On the other hand, in the conventional method, since the form panel used for the lower lift is diverted as it is, operations such as panel cleaning, cramping, and setting adjustment are critical operations in the entire process. Therefore, the use of the formwork apparatus of the present embodiment makes it possible to considerably shorten the entire construction period as compared with the related art.

[0045]

As described above, according to the formwork method of the present invention, as described in claim 1, the support attached to the work scaffold is fixed to the concrete wall surface by using a predetermined fixing means. A step of slidably supporting a form panel of a predetermined lift by a supporter which is connected to the support body so as to be able to move up and down, and placing concrete in the form panel in such a state; Curing the mold until the strength is developed, removing the mold panel of the lift preceding the predetermined lift, and after hardening the concrete, fixing the support to the concrete wall surface by predetermined fixing means, Removing the fixing means for fixing the support, raising the work scaffold and the support by reacting to the support, and fixing the support to the fixing means. A step of removing the fixing means, which has fixed the shoring, and sliding the shoring on the back of the form panel of the predetermined lift and the form panel of the next lift, while fixing the fixing means to the concrete wall surface again using A step of raising the supporting structure by applying a reaction force to the support, so that the period of the form panel can be extended without affecting the entire process, and the concrete surface can be sufficiently cured. At the same time, the overall steps of the jump-up method can be shortened.

Further, in the formwork apparatus of the present invention, a support for supporting the formwork panel is provided on the back side of the formwork panel provided along a predetermined design wall surface, and While the shoring is configured to be slidable, a lifting mechanism that can move up and down along a predetermined support attached to a work platform is connected to the shoring, and the support is detachably fixed to a concrete wall surface. Since the fixing means and the fixing means for detachably fixing the shoring to the concrete wall surface are provided, it is possible to extend the period of the form panel without affecting the entire process and sufficiently cure the concrete surface. It is possible to shorten the entire process of the jump-up construction method.

[0047]

[Brief description of the drawings]

FIG. 1 is a flowchart showing a formwork method according to the present embodiment.

FIG. 2 is a vertical sectional view of the formwork device according to the embodiment.

FIG. 3 is a vertical sectional view in each step, wherein (a) shows a state before concrete is cast on a form panel, and (b) shows a state after concrete is placed on the form panel. (C) shows that the form panel of the next lift was built and the form panel of the preceding lift was removed.

FIG. 4 is a vertical cross-sectional view in each step, (a) showing a state where a support point of the work scaffold is moved from a support to a shoring, and (b) is a state after the work scaffold is raised. What was shown.

FIG. 5 is a vertical cross-sectional view of each step, (a) showing a state where a support point of a work scaffold is moved from a shoring to a support, and (b) is a state after raising a shoring. What was shown.

[Description of Reference Numerals] 101 Concrete placing process 102 Curing process 103 Formwork building process 104 Demolding process 105 Supporting fixing process 106 Work scaffold raising process 107 Support fixing process 108 Supporting raising process 1 Formwork device 2 Formwork Panel 3 Shoring 4 Work scaffold 5 Support (gin pole) 6 Reversing jack (elevating mechanism) 13 Anchor (fixing means) 14 Sea bolt (fixing means) 16 Rod

Claims (2)

(57) [Claims] 1. A support attached to a work scaffold is fixed to a concrete wall surface using a predetermined fixing means, and a form panel of a predetermined lift is slid by a supporter which is connected to the support so as to be able to move up and down. Freely supporting and placing concrete in the form panel in such a state; curing the cast concrete until a predetermined strength is developed; form panel of a lift preceding the predetermined lift Removing the mold, curing the concrete, fixing the support to the concrete wall surface by a predetermined fixing means, and removing the fixing means fixing the support, and removing the working scaffold and the support. Raising the support by a reaction force, and fixing the support to the concrete wall again using the fixing means; Removing the fixing means which has been fixed, and sliding the support on the back of the form panel of the predetermined lift and the form panel of the next lift while taking a reaction force on the support against the support. And a step of raising the form. 2. A support for supporting the form panel is provided on the back side of the form panel disposed along a predetermined design wall surface, and the form panel and the support are slidable. Configured
On the other hand, an elevating mechanism that can move up and down along a predetermined support attached to the work scaffold is connected to the support, and fixing means for detachably fixing the support to the concrete wall and the support are attached to the concrete wall. A formwork device comprising fixing means for detachably fixing the formwork.