JPH07158265A - Construction method of sliding form - Google Patents

Abstract

PURPOSE:To dispense with a guide rod and satisfactory finish the surface of concrete. CONSTITUTION:On the inside of a form 2 arranged along the sectional form of a structure 1, an edge cutting panel 4 which slides relatively to the form 2 is continued to the upper part of the edge cutting panel situated below. Concrete C is placed in the inside of the edge cutting panel 4, and after the concrete C is hardened, a raising jack 8 suspended from a yoke 3 for supporting the form 2 is extended, whereby a reaction is taken against the top end of the concrete to raise the form 2 together with the yoke 3. The yoke 3 or the form 2 is supported by the existing concrete, the raising jack 8 is contracted. These processes are repeated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sliding formwork method.

[0002]

2. Description of the Related Art In the conventional sliding formwork method, a formwork arranged along the sectional shape of a structure is lifted by a reaction force to a guide rod or main bar embedded in the structure by a jack, Compared with the method of repeating the work cycle of placing concrete and assembling, disassembling, and reassembling concrete, the concrete structure is continuously constructed upward by placing concrete in the formwork. Since it is possible to move the formwork upward while interlocking with the hardening time of the concrete while pouring and curing the concrete, there is an advantage that the work can be continuously performed.

[0003]

However, in such a conventional sliding formwork method, it is necessary to firmly support the formwork against a large concrete pressure, so that the formwork is reinforced and supported. As a result of the need to increase the size of the yoke and the like in order to arrange the material, the size of the entire device increases. When the size of the entire device increases, the weight of the device increases, which increases the free length of the guide rod and causes a problem that the guide rod easily buckles. Moreover, since the adhesion strength between the formwork and the concrete becomes large, it is necessary to apply a large reaction force to the guide rod, and the problem of buckling becomes significant.

The present invention solves the above problems.
An object of the present invention is to provide a sliding formwork method capable of improving the finished surface of concrete by eliminating the need for guide rods.

[0005]

In order to achieve the above object, the present invention provides an edging panel inside a formwork arranged along the cross-sectional shape of a structure, which produces a relative slip with respect to the formwork. Connected to the upper part of the edge cutting panel located below,
After concrete is cast inside the edge cutting panel and the concrete is hardened, a reaction force is applied to the top of the concrete to raise the formwork, and the formwork is supported on the existing concrete, and then the rising jack is used. Is repeated.

[0006]

According to the above construction, the lifting jack takes a reaction force to the top of the already hardened concrete to raise the form, so that the conventional guide rod is unnecessary and it is not necessary to consider its buckling. . When the formwork is raised, the edge trimming panel is fixed to the side of the concrete, causing slippage with the formwork, allowing a smooth ascending operation, and the concrete surface does not rub against the formwork. The surface finish of the structure can be made beautiful.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings. 1 to 3 show a sliding formwork method of the present invention, in which a formwork 2 arranged along the cross-sectional shape of a concrete structure 1 to be obtained and an outside of the formwork 2 are provided. And a yoke 3 for supporting this, and the mold 2
A sliding formwork apparatus for constructing a structure 1 by stacking a certain number of concrete structures 1a, 1b, ... According to the height dimension of the formwork 2 in order from the bottom for each ascending work.

An edge cutting panel 4 is arranged inside the formwork 2. The edging panel 4 is made vertically longer than the height dimension of the formwork 2. For example, as shown in an enlarged view of a part of FIG. 1, the front and back surfaces of the plywood material 4a are made of a smooth material such as polypropylene sheet. By sticking a certain sheet 4b, a relative slip is generated with respect to the form 2, and the sheet is held on the side surface of the structure 1 and left as it is, so that it also serves as a curing sheet. In this way, since the edge cutting panel 4 is arranged inside the formwork 2 and relative sliding with respect to the structure 1 can be caused, and the concrete structure is not rubbed, the height of the formwork 2 is increased. The size can be set large.

The yoke 3 is arranged around the mold 2 and supports the pillar 5, a beam 6 integrally assembled on the upper part of the pillar 5, and a work floor integrated around the pillar 5. It consists of 7. A jack 8 for raising is integrally hung at the lower center of the beam 6. This jack 8
Contacts the top end of the plunger 8a, which is arranged so that it can be retracted in the lower part thereof, with the top end of the structure 1 and further extends the plunger 8a to take a reaction force to the structure 1 and raise the entire apparatus. Since the mold 2 having a large height can be used by the edge cutting panel 4 arranged inside the mold 2, a long stroke jack can be used as the jack 8. In this embodiment, the long stroke jack is used. Is used.

A fixing jig 9 is fixed to the side portion of the existing concrete structure. The fixing jig 9 has a lower end at the position where the mold 2 is raised with respect to the structure 1,
Supported by the plunger 8 of the jack 8.
The load of the entire device is supported with a being immersed. Further, in this embodiment, the edge cutting panel 4 is fixed by the fixing jig 9.
Is fixed to the side of the concrete structure. In addition,
In this embodiment, the mold 2 is supported by the fixing jig 9 in order to support the load of the entire apparatus, but it may be configured to support the yoke 3 or the entire apparatus is supported by the main bar. May be.

Next, a procedure for constructing the structure 1 using the above mold apparatus will be described. First, FIG. 1 shows a state in which concrete C has already been poured into the formwork 2, and as a result, a new concrete structure 1b has been built on the existing concrete structure 1a, and the lower end of the formwork 2 is The edge cutting panel 4
Is supported by an upper part of a fixing jig 9 which is fixed to a side portion of the structure 1 through the structure 1, and the load of the entire apparatus including the mold 2 is supported by the structure 1. Until the concrete C hardens, a worker joins the vertical bars 10 and arranges the horizontal bars 11 in the upper part of the concrete structure 1b.

When the concrete C has hardened to the required strength, the separator described later is removed, and then the plunger 8a of the jack 8 is extended and brought into contact with the top end of the structure 1 and further extended. By doing so, a reaction force is exerted on the structure 1 and the mold 2 is pulled up together with the yoke 3 as shown in FIG. At this time, since the edging panel 4 is fixed to the side surface of the structure 1 by the fixing jig 9, the formwork 1 smoothly slides while sliding on the outside of the edging panel 4. Since the jack 8 has a long stroke,
The formwork 2 together with the yoke 3 is elevated high at a time.

In the raised position, as shown in FIG. 3, the fixing jig 9 is fixed around the structure 1b, the lower end of the formwork 2 is supported by the fixing jig 9, and the edging panel 4 located below is fixed.
Join a new edging panel 4 on top of.

After that, when the plunger 8a is immersed in the jack 8, the load of the entire apparatus including the mold 2 is deposited on the structure 1 via the fixing jig 9, and in this state, the load between the opposing molds is maintained. A separator is arranged, a cone is attached to the separator,
The formwork 2 (including the edging panel 4) is supported by fastening the form ties, and the next concrete structure 1
The concrete is ready to be poured in c. In this state, by placing concrete in the placing space surrounded by the formwork 2, the concrete structure 1c is constructed on the concrete structure 1b.

The structure 1 is adjusted according to the height of the mold 2 by sequentially repeating the bar arrangement, the mold raising, the mold fixing, the edging panel arrangement, the separator arrangement, the concrete placing, and the separator removal. Can be built continuously. The edge cutting panel 4 left on the side surface of the structure 1 can be peeled off and diverted by removing the fixing jig 9 from the lower part in order at the same time when the curing period is completed. In addition, the structure 1 after removing the edge trimming panel 4 corresponding to the smoothness of the edge trimming panel 4
The surface of is smooth and beautifully finished.

[0016]

As described above in detail with reference to the embodiments, the sliding formwork method according to the present invention has the following effects. Since the mold rises by taking a reaction force to the top of the already hardened concrete, the conventional guide rod is unnecessary, and its carrying work, joining work, and management work can be omitted. When the formwork is raised, the edge trimming panel is fixed to the side of the concrete, causing slippage with the formwork, allowing a smooth ascending operation, and the concrete surface does not rub against the formwork. The surface of the structure can be made smooth and beautiful.

[Brief description of drawings]

FIG. 1 is an explanatory sectional view showing one step of a sliding formwork method according to the present invention.

FIG. 2 is a cross sectional view showing the next step.

FIG. 3 is a cross-sectional explanatory view showing the next step.

[Explanation of symbols]

 1 Concrete Structure 2 Formwork 3 Yoke 4 Edge Cutting Panel 5 Strut 6 Beam 8 Ascending Jack 9 Fixing Jig 10 Vertical Strip 11 Horizontal Strip

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yukio Okuda 2-3 Chome, Kandajimachi, Chiyoda-ku, Tokyo Obayashi Corporation Tokyo Head Office

Claims (1)

[Claims] 1. An edge-cutting panel, which is arranged inside the mold along the cross-sectional shape of a structure, is connected to an upper portion of an edge-cutting panel located below and which slides relatively to the mold, and the edge-cutting panel is connected. After placing concrete inside the concrete and hardening the concrete, the reaction force is applied to the top of the concrete to raise the formwork, and the formwork is supported on the existing concrete, and then the rising jack is retracted. Sliding formwork method characterized by repeating steps.