JP2830804B2 - Concrete formless foundation excavation 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 concrete excavation method for excavating a ground surface for placing a steel column of a building or a concrete foundation of a heavy-duty machine also as a formwork.

[0002]

2. Description of the Related Art When digging a foundation of a steel column in a building, a road foundation thereof, and a foundation ground surface of a heavy-duty machine, etc., an installation work of a formwork 4 for placing a foundation concrete 3 as shown in FIG. In order to do so, a work space A is required, so that conventionally, it is customary to perform so-called extra excavation in which the required form dimensions are greatly excavated and expanded.

[0003]

Conventionally, the excavation of the foundation ground surface B for placing the foundation concrete 3 has a size of the formwork necessary to secure a working space A for forming the formwork below the ground. Excessive excavation around the so-called extra-large excavation had to be made. As a result, extra labor and time are enormous, and extra labor is required, such as extra soil removal work, transport processing such as securing a temporary storage area, and backfilling work and crushed stone disposal concrete. In the case of backfilling, there were problems such as deterioration of the side of the foundation concrete in contact with the earth wall.

[0004] The present invention relates to basic concrete 3 such as steel columns.
Excavating the ground from the ground surface to be cast into the same dimensions as the concrete foundation dimensions, and making the surrounding bottom surface and soil wall the same as the formwork, eliminating the need for formwork and simultaneously constructing the formwork The purpose of the present invention is to eliminate extra digging for the space A, thereby significantly reducing the labor and cost of unloading work and backfilling, and significantly shortening the construction period.

[0005]

SUMMARY OF THE INVENTION The present invention provides a foundation C for steel columns.
Of excavation under the ground for placing concrete of road foundation D and concrete to the same dimensions as required surrounding concrete 3 and casting concrete as it is for formwork to form the foundation Excavation method. That is, the soil excavation area to be dug below the ground surface for the construction of the foundation C such as a steel column or the foundation C to be cast as the road foundation D is excavated to the same dimension as the required dimension of the foundation concrete 3. Mortar milk 1 in which cotton lint 5 is mixed into a so-called mortar in which sand and cement are mixed with water on the soil surface and bottom surface
Is sprayed and solidified, and the soil wall surface is used as it is to form a formwork / surface 2 and concrete is poured into this surface to form a foundation. For solidification of the earth wall surface, a synthetic resin foam cannon bead 6 may be sprayed and solidified, or a corrugated cardboard plate 8 may be attached to the wall surface.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Generally, when soil under the ground surface is excavated, the surrounding soil wall collapses and the size of a hole for hitting concrete cannot be secured, so that it cannot be used as a formwork for the foundation concrete 3 and the wall surface is temporarily crushed. There is a problem that the concrete is deteriorated due to the soil and water on the wall surface when the concrete is poured also as the formwork. However, in the present invention, the mortar milk 1 is sprayed and solidified on the ground surface around the excavation and the excavated soil wall surface and the bottom surface to improve the soil. Therefore, the soil wall surface is solidified to form a formwork, and a formwork / surface 2 having a thickness of about 100 mm is formed and does not mix with the foundation concrete 3 to be cast as it is and does not deteriorate. In this case, the cotton yarn waste 5 mixed in the mortar milk 1 serves as a mortar connection, thereby solidifying the solidification.

[0007] Therefore, it is not necessary to use a formwork for placing concrete, and the foundation hole is only required to be excavated to the same size as the actual size of the foundation concrete 3, so that there is no need for so-called extra excavation. The labor and cost, including, are significantly reduced, and the construction period is considerably reduced. According to the trial calculation of the embodiment, the cost of the method of the present invention is not required for crushed stone, discarded concrete, formwork, etc., but it is also possible to reduce the labor and cost for backfilling, etc. Saved money.

[0008] The blowing heated fire on the side walls and bottom with drilled foundation concrete 3 made of synthetic resin foamed bi <br/> over 6 a foamed machine as a method of solid the bottom and side wall surfaces of the same size a thin foamed bead layer 7 on the surface of the soil to form the layer can also obtain the same effect by. In this case onset foam beads layer 7 protects the purity of foundation concrete for pouring reliably isolate the water hardly Ku soil wall does not swell dissolved in compressive strength higher water and oil from the soil wall.

As a method of forming the formwork surface 2, a waterproof corrugated cardboard plate 8 may be attached to the bottom wall surface, and the ears 9 projecting upward may be nailed to the ground surface edge. In this case, the peripheral wall of the foundation concrete is not thinned and does not deteriorate. After casting, embed as it is.

[0010]

According to the present invention, a soil excavation trench is excavated to the same size as the actual size of the foundation concrete without excavating the excavated ground surface for placing concrete for foundations such as buildings and heavy machinery. Since the concrete can be cast as it is also used as a formwork, the labor and cost of extra digging and backfilling are significantly reduced, and the construction period is significantly shortened.

[Brief description of the drawings]

FIG. 1 is a plan view of a steel column foundation and a road foundation in a building.

FIG. 2 is a cross-sectional view of the formless method according to the present invention.

FIG. 3 is a cross-sectional view in the case of blowing foam beads.

FIG. 4 is a sectional view in the case of sticking a cardboard.

FIG. 5 is a sectional view of foundation excavation using a conventional formwork.

[Explanation of symbols]

1 Mortar milk 2 Formwork combined surface 3 foundation concrete 4 Formwork 5 cotton scraps 7 shot foam beads layer 8 corrugated board

Claims (3)

(57) [Claims] 1. Excavation of the ground surface for placing concrete such as steel columns in a building to the same size as the actual size of the foundation concrete, and spraying mortar milk mixed with cotton lint on the peripheral side wall and the bottom surface. A concrete-less formwork foundation excavation method characterized by solidifying to form a formwork surface, eliminating excess digging and placing foundation concrete with a formless formwork. Wherein no mold foundation excavation method of the concrete made form a layer of the foamed beads debris excavated side walls and bottom surfaces to the ground plane the same size as foundation concrete actual dimension such as steel columns. 3. A concrete-less formwork foundation excavation method in which a waterproofed cardboard board is attached to a side wall surface and a surface excavated to the same dimensions as the actual dimensions of the foundation concrete.