JPH0326250B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a formwork construction method for constructing underground parts such as independent foundations, cloth foundations, and underground beams of architectural structures, for example.

(Problems of the prior art to be solved by the invention) Conventionally, this type of formwork construction method used wooden or steel weir plates, which inevitably caused problems such as time-consuming assembly and disassembly of the formwork. .

(Purpose of the Invention) This invention was devised to solve the above-mentioned conventional problems, and is a method that uses synthetic resin sheets, cloth, paper, thin-walled iron plates, etc. and supports at a lower cost than conventional formwork. The purpose is to greatly improve construction efficiency by easily assembling the formwork using the mold and burying it after forming, thereby eliminating the trouble of dismantling the formwork.

(Structure of the Invention) The formwork construction method for an underground part of a structure according to the present invention is such that after installing columns in a row on the ground at intervals along the planar shape of the underground part, It is characterized in that a surrounding sheet enclosure is provided and then concrete is poured into the enclosure.

(Embodiment) A first embodiment of the present invention will be described below with reference to FIGS. 1 to 4.

First, at the bottom of the ground 1, support columns 3,...
to be arranged. In this case, for example, as shown in the figure, the lower end of the support column 3 is press-fitted into the ground and, if necessary, fixed with sacrificial concrete. The upper ends and lower ends of adjacent columns 3, 3 are connected with cross members such as wire, wood, shaped steel, etc., and if necessary, the opposing supports 3, 3 are also connected with cross members such as wire, thereby forming a frame. It is placed on a ground surface 5 made of chestnuts 4 or the like.
By pressing the lower end of the pillar 3 into the ground and connecting the upper ends of the pillars 3 and 3 in the same way,
The position of each support 3 is fixed.

Next, an endless annular sheet 6 having a tensile strength sufficient to withstand concrete pouring, which will be described later, is attached to the pillar 3.
An enclosure 7 is inserted into the column, connected adjacent to each column 3, and surrounding the interior of the column 3 is provided closely on the ground surface 5. If the sheet 6 is a synthetic resin sheet, cloth, paper, etc., the column connecting portion 8 provided thereon is tied to the column 3 with a wire 9 or the like. If it is a thin iron plate, the connection method may be selected depending on the material and strength of the sheet 6, such as connection as described above or welding. Next, after arranging reinforcing bars 10 in the enclosure 7 and placing concrete 11, the space between the enclosure 7 and the slope 12 is backfilled, and the backfilling earth pressure is applied to form a columnar independent foundation. The poured concrete is consolidated while maintaining the planar shape of 2.

Through the above procedure, the columnar independent foundation 2 is constructed using the sheet 6 as a fill-in formwork.

In this first embodiment, after pouring the concrete 11, the space between the enclosure 7 and the slope 12 was backfilled.
As shown in the second embodiment in FIG. 5, a fence 7' is provided by fitting sheets 6 into three rows of columns, and after backfilling between the fence 7' and the slope 12, concrete 11 is poured. You may. Further, although the columnar independent foundation 2 has been described in the first and second embodiments, the same applies to the case where an independent foundation with an inverted T-shaped cross section is constructed with a footing at the bottom of the foundation.

The difference from the first and second embodiments is that a footing is created and then a rising portion is created.
That is, as shown in the third embodiment in FIGS. 6 and 7, after the row of external supports 13a for creating footings is provided using the cross members 14, the same sheet 6 as that surrounding the inside of the row of external supports 13a is provided. Lower sheet 16a of configuration
A lower enclosure 17a is provided, and then reinforcing bars are placed inside the lower enclosure 17a to reach internal supports 13b, which will be described later. After concrete 11 is placed and a footing is created, when the footing is in a partially dry state. Internal support 1 for the rising part on the footing
The procedure is to provide an upper enclosure 17b made of an upper sheet 16b having the same structure as the sheet 6 that surrounds the interior through rows 3b, and to pour concrete 11 into the upper enclosure 17b.

Further, in the first to third embodiments, independent foundations have been described, but the same applies to the construction of cloth foundations, underground beams, underground walls, etc. The difference from the first to third embodiments is that, as shown in FIGS. 8 and 9, the fourth embodiment is made of a sheet 26 having the same structure as the sheet 6 along the parallel planar shape of the cloth foundation etc. 23 rows of columns for holding enclosures 27 are provided. In addition, if it is necessary to make the indoor wall surface flat, such as an underground wall, it is sufficient to use at least a thin steel plate for the sheet part for forming the wall surface, and to support this flatly with pillars from the other wall side. .

In this invention, when it is necessary to maintain the planar shape of the construction target, the construction may be performed using columns arranged narrowly between columns, and it is not necessarily necessary to perform the construction using backfilling with earth pressure.

In addition, if water-permeable cloth, paper, etc. are used for the sheets 6, 16a, 16b, 26, excess moisture in the poured concrete can be quickly moved to the surrounding area, and this moisture and dust can be removed from the poured concrete. This invention has the advantage of allowing water to be discharged from the concrete and making the poured concrete more dense, but it goes without saying that a non-water permeable sheet such as a synthetic resin sheet or a thin iron plate may also be used in this invention.

(Effects of the Invention) As described above, the present invention is a formwork construction method in which an enclosure made of sheets is held by supports and concrete is poured into the enclosure, and the sheets are buried in the formwork. Compared to the frame construction method, the formwork is easier to assemble, and the formwork does not need to be dismantled, making it possible to greatly improve construction efficiency and save labor.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing the formwork assembly situation of the first embodiment of the present invention, Figs. 2 and 3 are a plan view and a front sectional view showing the concrete placement situation, and Fig. 4 is the earth and sand backfilling situation. FIG. FIG. 5 is a plan view showing the earth and sand backfilling situation of the second embodiment of the present invention. FIG. 6 is a perspective view showing how the formwork is assembled in a third embodiment of the invention, and FIG. 7 is a plan view showing how concrete is placed. FIG. 8 is a perspective view showing how the formwork is assembled in a fourth embodiment of the present invention, and FIG. 9 is a plan view showing how concrete is placed. 1...Ground, 2...Column independent foundation, 3,13
a, 13b, 23...post, 6, 16a, 16
b, 26... Sheet, 7, 7', 17a, 17b,
27...Fence, 10...Reinforced steel, 11...Concrete, 12...Slope.

Claims (1)

[Claims] 1. After installing columns in a row on the ground at intervals along the planar shape of the underground part of the structure, installing a sheet enclosure surrounding the column of columns, and then pouring concrete into the enclosure. A formwork construction method for underground parts of structures.