JP2874539B2 - Method for constructing concrete structure and weir plate used in this method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing a concrete structure having, for example, a horizontal cross-sectional shape which is substantially the same in the vertical direction, and a dam plate used in this method.

[0002]

2. Description of the Related Art As a method of continuously constructing such a concrete structure, a sliding form method is generally employed. The sliding form device used in this method includes a form disposed along the cross-sectional shape of the structure, a yoke outside and supporting the form, and fixed to the upper center of the yoke. There is also known a device provided with a rising jack which rises by taking a reaction force on a guide rod embedded in a structure.

[0003] Once the formwork device is set once, the concrete jacks are driven upward by driving the ascending jacks while concrete is poured into the formwork, thereby continuously moving the concrete structure upward. Compared to the method of repeating the work cycle of placing concrete and assembling, dismantling, and reassembling the formwork, it is possible to construct concrete structures with almost the same horizontal cross-sectional shape in the vertical direction in a short period of time. be able to.

[0004]

However, in this method, since the formwork rises while being in contact with the surface of the concrete before the concrete has not exhibited sufficient strength, the surface of the concrete is colored by abrasion or rust juice. There is a risk of unevenness.

According to the present invention, it is possible to construct a concrete structure having substantially the same horizontal sectional shape in the vertical direction in a short period of time, thereby reducing the size of the entire apparatus and improving the finish of the concrete surface. It is an object of the present invention to provide a method of constructing a concrete structure that can be made into a concrete structure and a dam plate used in the method.

[0006]

In order to achieve the above object, a method of constructing a concrete structure according to the present invention is provided by dropping a plurality of weir plates into a form guide arranged around the concrete structure. Arranging a weir plate along the cross-sectional shape of the concrete structure; placing concrete in the interior surrounded by the weir plate; after the concrete has hardened, raise the form guide to raise the weir The step of leaving the plate on the surface of the concrete is sequentially repeated up to a required height (claim 1).

The barrier plate used in the method for constructing a concrete structure according to the present invention is provided with a slide rail having a substantially I-shaped or dovetail-shaped cross section, which is engaged with the guide rail, and is integrally provided on the back surface thereof. (Claim 2).

[0008]

In the method of constructing a concrete structure having the above structure, the form is assembled only by dropping the dam plate into the form guide, and the form is assembled by the top end of the existing concrete structure and the form. A concrete casting space is formed. By driving the lifting jack after placing the concrete, the form guide is raised together with the support, but the dam is left in contact with the concrete surface. After the ascent is stopped, a new dam is dropped into the form guide, and a continuous form is assembled above the dam.

In the dam plate used in the method for constructing a concrete structure having the above configuration, the above-described method can be implemented easily and at low cost.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows an overall configuration when the present invention is applied to the construction of a concrete column having a rectangular cross section.

The assembling apparatus comprises a plurality of dam plates 2, 2, which are arranged flush with each other along the cross-sectional shape of the concrete column 1.
And a form guide 3 for supporting the back side of each of the weir plates 2 and 2 so as to be relatively slidable in the vertical direction, and a gate-type supporter disposed outside the form guide 3 to support the form guide. 4
And a plurality of work scaffolds 5 arranged around the shoring 4
a, 5b, 5c and a guide rod 1a fixed to the center of the upper part of the support 4 and buried in the existing concrete column 1 and protruding upward from the concrete pillar 1 to take the support 4 into the form guide 3 , A lifting jack 6 that is raised together with the work scaffolds 5a, 5b, 5c.

As shown in FIG. 2, the form guide 3 extends vertically and has a dovetail-shaped guide rail 7 arranged at predetermined intervals in the horizontal direction. And a plurality of support bars 8 connecting and fixing the guide rail 7 and the shoring 4 together.
The guide rail 7 has a height dimension corresponding to the height of the weir plate 2 for about three panels, and one side is set to the number supporting the weir plate 2 for two panels.

On the other hand, each of the weir plates 2 is made of a steel plate or the like constituting an assembling unit of a formwork. The rail 9 is provided integrally in the up-down direction.

In order to arrange each dam plate 2 inside the form guide 3, a slide rail 9 is engaged with the upper part of the guide rail 7 as shown in a part of FIG. 3, and the lower edge thereof may be brought into contact with the upper edge of the dam plate 2 already arranged.

In this manner, the weir plates 2 are successively dropped into the inside of the form guides 3 and the respective weir plates 2 are arranged in a horizontal line so as to be flush, so that the form A surrounding the top end of the concrete column 1 is formed. Is constructed. In parallel with this formwork assembling work, a work for arranging the vertical streaks 10 and the horizontal streaks 11 is performed at an upper position of the formwork guide 3. At this time, a separator (not shown) can be arranged between the opposing dam plates 2, and a cone and a foam tie (both not shown) are fastened to the separator. In the lower part, the formwork left on the concrete surface is dismantled.

After the completion of the above assembling work, concrete is poured into the formwork. Since the weir plate 2 is supported by the separator, the supporting work can be simplified by bearing the lateral pressure of the concrete on which the separator is cast.

When assembling the form, water stopping means are provided at the upper, lower, left, and right joining edges, and a support is arranged on the rear surface of the form at a position between the form guides 3 so as not to hinder the ascent operation. You can also.

In parallel with this formwork assembling work, a work for arranging the vertical streaks 10 and the horizontal streaks 11 is performed at an upper position of the formwork guide 3. In the lower part, the formwork left on the concrete surface is dismantled. In addition, the weir plates 2 that have been individually separated by dismantling are transferred from the work scaffold 5c to the work scaffold 5b, and are diverted to the assembly of the next formwork.

When the concrete has hardened and the strength has developed to some extent, the lifting jack 6 is driven to raise the entire apparatus by one panel. When the form guide 3 and the shoring 4 are raised, only the dam 2 is left on the concrete surface as shown in FIG. Since the form guide 3 is not in contact with the entire surface of the weir plate 2, the frictional resistance between the two is small, so that the ascending operation is smooth and the capacity of the ascending jack 6 can be reduced. The size of the entire device can be reduced in combination with the simplification of the support work due to the arrangement of the devices.

Further, since the weir plate 2 is left on the surface of the concrete and the weir plate 2 does not rub against the surface of the concrete, the surface finish of the concrete can be improved. If a curing sheet (for example, a polyethylene sheet) is disposed on the inner surface of the weir plate 2, the surface finish of the concrete can be further improved.

At the stop position of the form guide 3 and the shoring 4, the assembling work of the upper formwork A, the arranging work and the removing work of the lower formwork A can be performed again. By repeating, the concrete column 1 can be completed. The work of removing the weir plate 2 after hardening of the concrete can be performed using the work scaffold arranged at the lower part of the apparatus as a foothold, and the dismantled weir plate can be transferred to the upper side of the apparatus and reused for assembling the formwork again. In addition to being economical, there is no need to add or remove temporary scaffolds, and the same effects as those of the conventional sliding form method can be obtained.

In the above embodiment, the guide rail 7 has a dovetail shape in cross section and the slide rail 9 of the weir plate 2 has a substantially I-shaped cross section. However, it is needless to say that this relationship may be reversed. Nor.

[0023]

As described in detail in the above embodiments, in the apparatus for assembling a formwork according to the present invention, the formwork is assembled only by dropping the dam plate into the formwork guide, and the existing concrete is assembled. Since the concrete pouring space surrounded by the top end of the structure and the formwork is formed, the assembling work of the formwork is simple.

After the concrete is cast, the form guides and supports are raised by driving the lifting jacks, so that only the dam is left on the concrete surface. Therefore, the surface finish of the concrete by sliding the dam is good. Can be

Further, in the weir plate used in the method of constructing a concrete structure having the above configuration, the above-described method can be implemented easily and at low cost.

[Brief description of the drawings]

FIG. 1 is an overall explanatory diagram when the present invention is applied to the construction of a concrete column.

FIG. 2 is a perspective view showing a relationship between a form guide and a weir plate.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Concrete column (concrete structure) 2 Weir board 3 Form guide 4 Support 5a, 5b, 5c Work scaffold 6 Elevating jack 7 Guide rail 8 Support bar 9 Slide rail A Form

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masami Ito 2-3-3 Kandajicho, Chiyoda-ku, Tokyo Obayashi Corporation Tokyo Head Office (72) Inventor Shigeyuki Togawa 4-640 Shimoseito, Kiyose-shi, Tokyo Stock Company (72) Inventor Takayoshi Hirata 4-640 Shimoseito, Kiyose-shi, Tokyo Co., Ltd. Obayashi Corporation Technical Research Institute (58) Field surveyed (Int.Cl. ⁶ , DB name) E04G 11/22

Claims (2)

(57) [Claims] 1. A step of disposing a plurality of weir plates along a cross-sectional shape of the concrete structure by dropping a plurality of weir plates into a form guide arranged around the concrete structure. Concrete structure characterized by repeating a step of pouring concrete into the cut inside, and a step of raising the form guide and leaving the weir plate on the surface of the concrete after the concrete hardens, until the required height is reached. How to build things. 2. A cross section substantially I for engaging said guide rail.
The weir plate used in the method of constructing a concrete structure according to claim 1, wherein a slide rail having a shape or a dovetail shape is integrally provided on a back surface thereof.