JPS583876Y2 - Formwork for pouring on slopes for concrete revetment construction - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a formwork for pouring concrete onto a slope in concrete revetment work in which concrete is poured onto a slope using a steel formwork.

Originally, in full concrete revetment work for river embankments, backing gravel was laid on a well-compacted soil slope, a layer of waste concrete was spread several centimeters thick on top of this, and a surface layer of concrete was poured on top of this. is normal.

In the above-mentioned surface concrete pouring, a plurality of prismatic edge shapes are placed side by side in the slope direction at intervals of about 1 m on the slope, and every other corner of each section is formed between each edge shape. After about a week, each edge molding material is removed and the hardened concrete is used as the edge molding material to pour concrete in each of the remaining sections. Moreover, the slope slope of the river is 15%
The slope is between 20% and 20%, so it's only a matter of time.The surface of the kneaded material is finished by a person using a trowel, which requires an extremely large amount of human labor, and it is irrational and takes a long time to get off the ground. It was something.

Therefore, recently, a fill-in formwork (usually using vinyl sheet L-, etc.) is placed on top of the backfill gravel, and a steel formwork is placed above it with a space for pouring concrete of a specified thickness7.
The construction method used is to pour concrete into the above space.

Large steel forms for pouring on slopes, called slope platforms, have begun to be used in this construction method.

This is 10 x 15 cyn as a guide for steel formwork.
A wooden profile with the above cross section was installed prior to shaping,
Each of these was fixed to the ground with iron spikes, and the steel formwork described in 1 was placed on top of the formwork, and while pouring concrete,
This is a method of pulling up with a winch, etc., and in actual practice, this distance is about 4 meters.

Even in this conventional construction method, the air in the poured concrete rises to the surface and remains between it and the inner surface of the steel formwork, and when vibration is applied to the concrete, internal surplus is generated. A breathing phenomenon occurs in which free water floats to the surface with air, cement, and other free fine particles, and as the free water flows along the inner surface of the steel formwork, it separates into the surface layer of the poured concrete, causing the slabs and the above-mentioned. Laitance, which is formed by the drying of floating components, is extremely unpleasant, and the surface of poured concrete is finished by troweling and curing.

In this way, in the conventional bank revetment concrete construction method using the above-mentioned steel formwork, it was inevitable that the surface of the poured concrete would become dirty due to slabs and laitance, and for this reason, manual finishing was always required. It requires troublesome surface finishing,
It had major drawbacks, such as requiring a lot of troublesome labor and human labor, prolonging the construction process, and increasing construction costs.

This invention was made in view of the above, and was aimed at solving the above-mentioned conventional drawbacks by providing a formwork for pouring concrete into a slope for concrete revetment work as described below.

To explain concretely the formwork for slope pouring of this invention with reference to the drawings and examples, 1 is made of styrene paper (foam), which is breathable and impermeable to normal water, but allows pressure water to seep through little by little. etc. (pores 0.05~Q, 1mm)
) and a water-permeable fibrous layer 3 such as cardboard with large voids, and a suitable release agent 5 is coated on the surface of the porous layer 2. .

In other words, this sheet 1 has a structure similar to that of animal skin, with a finely porous layer 2 on the surface and a fibrous layer 3 with large voids underneath, and unlike shoe leather, it is difficult for water to enter from the outside, but inside. It has a structure similar to that of a so-called collagen tissue, through which air can freely enter and exit.

In this invention, the sheet 1 is removably stretched on the inner surface of a large steel formwork 4 with adhesive tape or the like, as shown in Figures 1 and 2 of the drawings, with the porous layer 2 side facing outward. This is a formwork for pouring on slopes.

Therefore, to explain the case of carrying out concrete revetment work using the formwork A for slope pouring of this invention with reference to drawings 3 and 4, firstly, on top of the well-compacted slope 6a of the embankment body 6, backfill gravel is poured. 7 is laid, and a fill-in formwork 8 such as a vinyl sheet is further stretched over it.

Next, a plurality of shapes 9 are arranged and fixed at appropriate intervals on the burying form 8, and the slope pouring form A of this invention is placed on top of each of the shapes 9, and the tension sheet 1 is placed on top of each of the shapes 9. The side of the large steel formwork 4 is placed on the back side and the side of the large steel formwork 4 is placed on the front side, and concrete is poured into the space of a predetermined thickness formed between the burying formwork 8 and the slope pouring formwork A from the outer frame. While applying vibrations and placing the surface concrete 10, the formwork A for slope pouring is successively pulled up with a winch or the like, and the surface concrete 10 is successively placed.

The formwork A for slope pouring of this invention is breathable and has a fine porous layer 2 that does not allow normal water to pass through but allows pressure water to seep through little by little, and a water permeable fibrous layer 3 with large voids. The structure is such that a sheet 1 formed by combining the two is removably stretched over the inner surface of a large steel formwork 4 with its porous layer 2 on the outside. When performing this process, the porous layer 2 of the sheet 1 is stretched on the surface of the concrete to be poured, and the fibrous layer 3 of the sheet 1 is stretched on the inner surface of the large steel formwork 4. - When vibration is applied, the air generated and intervened in the poured concrete passes through the porous layer 2 and escapes into the fibrous layer 3 of the sheet 1, so that no air bubbles or bubbles are formed on the surface of the surface concrete 10. When water that is plastic and does not have plasticity is liberated and floats as pressure water, the pressure water penetrates into the sheet 1 while penetrating the porous layer 2 due to the pressure, and the fibrous layer 3 This pressure water can be removed by flowing and moving, and since the water combined with cement has plasticity, it will not escape into the sheet 1 even if pressure is built up. It has an excellent effect that does not cause laitance.

In this way, the surface of the surface concrete 10 is clean and free of slats, laitance, etc., so there is no need for troublesome manual surface finishing, which saves labor.
It can contribute to shortening the construction period and reducing construction costs, and has outstanding effects such as being extremely economical.

In addition, in the slope pouring formwork of this invention, the surface of the porous layer 2 of the sheet 1 has releasability, and the sheet 1 is stretched on the inner surface of the large steel formwork 4 in a removable manner. Because it is a concrete type, there is no need to apply concrete release agent to the formwork when demolding and moving it, and it is only necessary to replace sheet 1, so there is no need to clean it after demolding or apply oil for release material. The work can be done quickly and has the effect of being extremely easy to work with and efficient.

[Brief explanation of drawings]

The drawings show an example of the formwork for pouring on slopes of this invention, in which Fig. 1 is a perspective view, Fig. 2 is a partially enlarged vertical sectional view, and Fig. 3 is the formwork of this invention. Fig. 4 is an enlarged longitudinal sectional view of the main part of the same. 1...Sheet, 2...Porous layer, 3.
...Fibrous layer, 4...Large steel formwork, 5
...Removal agent, 6 ... Embankment body, 6a ...
...Slope, 7...Backfill gravel, 8...
Filling formwork, 9... Form material, 10... Surface concrete, A... Formwork for pouring on slope.

Claims (1)

[Scope of utility model registration request] The porous layer 2 is a combination of a fine porous layer 2 that is breathable and does not allow water to pass through, but allows pressure water to seep through little by little, and a water permeable fibrous layer 3 with large voids. This formwork for pouring on a slope for concrete revetment work is made by removably stretching a sheet 1 having a releasable surface onto the inner surface of a large steel formwork 4 with its porous layer 2 side facing outward.