JPH11210225A - Form material of sliding form device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a form material in a sliding form device, by which lifting operation from the state of work stoppage for a prolonged time is conducted smoothly by further improving the separability of forms to concrete. SOLUTION: The sliding form device has a supporting yoke 12 movably arranged to the lower section of a working floor beam 10 along the horizontal direction of the working floor beam 10, forms 22 oppositely disposed to the lower section of the supporting yoke 12 and a reaction jack 32 being placed on the forms 22, being engaged with a rod 34 as a main reinforcement built into concrete C and upwards elevating the supporting yoke 12 along the rod 34, and the forms 22 are lifted together with the supporting yoke 12 with elevation operation by the reaction jack 32. A Teflon sheet 42 as a resin raw material excellent in slidability is arranged integrally on the internal surface side brought into contact with concrete C in the forms 22 at that time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to, for example, a sliding form device, and more particularly, to jacking up a form.
TECHNICAL FIELD The present invention relates to a form material capable of improving the edging properties of the formwork with respect to concrete.

[0002]

2. Description of the Related Art As a means for constructing RC tubular structures such as high-rise piers and chimneys, main towers of suspension bridges and oblique bridges, a slip form method is employed. In this slip form method, concrete is poured between a pair of forms supported by a form yoke, and a hydraulic jack is raised by applying a reaction force to a reaction force rod embedded in the concrete. By raising the form yoke, removing the form, and then pouring concrete on the top of the form, it is possible to reduce the labor required for reworking the form by repetitively repeating the concrete. .

[0003] The formwork is generally made of steel, and when concrete reaches a predetermined strength after the concrete is cast,
By operating the jack to jack up the formwork, the formwork is sequentially raised while being cut off from the concrete, and concrete is continuously poured.

In this method, in order to improve the edge of the formwork with respect to the concrete, the edge treatment such as applying a lubricant to the concrete contact surface on the inner surface of the formwork is performed, and the concrete casting is suspended for several hours or more. In such a case, it was necessary to perform a trimming operation called an empty slide for several hours after the completion of the casting. Moreover, such a conventional construction method cannot perform a jumping type construction method.

[0005]

That is, the lubricant has a low releasability from concrete in practice, and if the jacking-up operation is performed in such a situation, the lubricant is in a state close to a so-called unreasonable state. There is a problem that cracks and chips are generated on the concrete surface, and it takes time and effort for post-repair work.In order to prevent this kind of trouble, the formwork must always be jacked up and trimmed. The time required for jack-up work is reduced, which reduces the work time for other reinforcement arrangements, complicates time management, and increases the vertical dimension of the formwork. The amount of concrete per area was also small.

For this reason, when the work is to be suspended for a long time, for example, from the end of the casting work of the day to the next day, only the formwork is emptied to prevent the concrete from sticking to the concrete. It was indispensable to perform the work, causing a decrease in construction efficiency.

The structure to be constructed has a large amount of rebar,
When it is difficult to cast concrete continuously, such as when it takes time to rebar joint work, it is necessary to rely on the jumping formwork method. Since the mold cannot be used, it involves remodeling of the formwork from the casting position and re-installation to the next concrete placing position, which requires time and effort.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to further improve the edging ability of a formwork with respect to concrete so that the ascent operation can be smoothly performed from a state in which work is stopped for a long time. An object of the present invention is to provide a form material in a sliding form device capable of solving the above-mentioned problems.

[0009]

In order to achieve the above object, the present invention provides a support yoke disposed below a work floor beam, a formwork disposed opposite the lower part of the support yoke,
A reaction force jack on the formwork, which engages with a reaction force rod built in concrete and raises the support yoke upward along the reaction force rod; In a sliding formwork apparatus that raises the formwork together with a support yoke with a lifting operation by a jack, a slip sheet made of a resin material having a high lubricity is integrally disposed on an inner surface side of the formwork in contact with concrete. It is a feature.

Therefore, according to the present invention, the edge can be satisfactorily trimmed when the mold is jacked up by the edge trimming effect of the slippery sheet.

The lubricating sheet used in the present invention can be selected from a fluororesin, a high-density polyethylene resin and the like.

[0012]

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

FIG. 1 shows a sliding form device to which the present invention is applied. The formwork device in the figure includes a support yoke 12 suspended from a lower part of a work floor beam and a lower support 14 suspended from a lower part of the support yoke 12.

The support yoke 12 is provided in parallel with the yoke beam 16 movably arranged directly below the upper work floor beam 10, and in parallel with the yoke beam 16 below the yoke beam 16, and has a scaffold plate 18a on its upper surface.
, A yoke column 20 connecting the yoke beam 16 and each of the lower floor beams 18, a formwork 22 opposed to the lower opposing ends of both lower floor beams 18, and each lower floor beam 1
8 and a support stay 26 on which a handrail 24 is arranged in a direction perpendicular to the paper surface.

The support yoke 12 projects above the yoke beam 16 and has a brace 28a
The support member 28 is suspended and supported movably along a lower portion of the work floor beam 10 via a support member 28 connected by the support member 28.

A connecting beam 3 is provided between the yoke posts 20.
0 is disposed horizontally, and a reaction force jack 32 is fixed substantially at the center of the connection beam 30.

This reaction force jack 32 is built through the center of concrete C cast in the formwork 22 and is inserted into a reaction force rod 34 protruding above the concrete C. The entire formwork device is raised along the line.

Further, each of the molds 22 includes a support frame 36 which is vertically connected to the connection beam 30 and each of the lower floor beams 18 and a support frame 38 which is integrally suspended from a lower portion of the column 20. It is arranged on the inside via a movement adjusting device 40 so that the gradient can be changed.

In the above construction, the formwork 22 is a steel formwork, and as shown in an enlarged circle in FIG. 1, a Teflon sheet 42 as a lubricating sheet is integrally lined on the inner surface thereof. The Teflon sheet 42 cuts off the concrete C.

In addition, instead of the Teflon sheet, a lubricating sheet such as high-density polyethylene may be lined.
Various methods such as baking coating or other physical fixing means can be adopted as the lining method.

FIGS. 2 and 3 show the use of the above sliding form device.
This figure shows the state after concrete is poured and before it is poured when performing the jumping type construction.

In the figure, a broken line drawn horizontally in the concrete C indicates a concrete top C for each casting operation.
L is shown, and the broken line surrounding the periphery of the lower support 14 shows the fall curing net. Further, the formwork 22 has a height dimension larger than that shown in FIG. 1 due to the increased edge-cutting property with the concrete C due to the interposition of the Teflon sheet 42 described above, and is adapted to the jumping formwork method. .

That is, as shown in FIG. 2, after the concrete C is cast, the ascent of the concrete C is stopped until the strength is sufficiently developed. Can be carried out, and the work of arranging the horizontal muscles can be performed.

After the rebar arrangement is completed, as shown in FIG. 3, the whole concrete is raised by one casting amount, thereby completing the preparation work for placing the next concrete. Due to the slipperiness of the Teflon sheet 42 interposed at the interface between the concrete C and the formwork 22 during the ascent, the formwork 22 can be raised with sufficient slipperiness.

That is, the jumping form method is
It will be possible without reworking the frame,
Since the movement of the formwork is intermittent, the reinforcing work can be performed for a sufficient time, and the jack-up operation can be performed safely and securely in a short time.

[0026]

As is apparent from the above description, in the form material of the sliding form device according to the present invention, the work of raising the form can be carried out by increasing the work of raising the form by increasing the edging property with concrete. The construction management can be simplified because it can be performed without being affected by the construction.

In addition, the vertical dimension of the form can be increased, and the amount of concrete cast per operation can be increased.

Further, the jumping formwork method can be carried out without changing the formwork, and the concrete surface in the finished work is smooth and beautiful.

[Brief description of the drawings]

FIG. 1 is a side view showing an overall configuration of a sliding form device to which the present invention is applied.

FIG. 2 is a side view showing a state in which concrete is poured into a mold of the apparatus.

FIG. 3 is a side view showing a preparation state for the next concrete placing at a raised position of the same formwork.

[Explanation of symbols]

 Reference Signs List 10 work floor beam 12 support yoke 14 lower support 22 formwork 32 reaction force jack 34 reaction force rod 42 Teflon sheet (slippery sheet)

Claims (3)

[Claims] 1. A support yoke disposed at a lower portion of a work floor beam, a formwork opposed to a lower portion of the support yoke, and a reaction force mounted on the formwork and built in concrete. A reaction force jack which engages with a rod and raises the support yoke upward along the reaction force rod; and a sliding formwork which raises the formwork together with the support yoke with the ascending operation by the reaction force jack. In the apparatus, a sliding sheet made of a resin material having a high lubricating property is integrally disposed on an inner surface side of the form contacting with concrete, wherein the sliding sheet is integrally formed. 2. The form material of the sliding form apparatus according to claim 1, wherein the slip sheet is made of a fluororesin. 3. The form material of the sliding form apparatus according to claim 1, wherein the slip sheet is made of a high-density polyethylene resin.