JPH01151653A - Method of constructing base slab - Google Patents

Abstract

PURPOSE: To easily and quickly build a foundation slab having sufficient performance, without highly skilled carpenters, by injecting concrete from the filling port of a cloth bag, and constructing the foundation slab having the cloth bag on the outer perimeter thereof. CONSTITUTION: A cloth bag 1, having a dimension such that its cross-sectional area can become as large as or larger than needed from a design standpoint, and serving as the formwork of a foundation slab having a concrete filling port 2, is installed on soil or a foundation, and concrete is injected into the bag 1 from the filling port 2. The foundation slab is shaped gradually by the concrete and finally the cross section 4 of the foundation slab needed from a design standpoint is formed into a satisfactory shape.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention is for constructing a foundation slab for transmitting the stress of the upper structure to the lower structure such as the ground or earthworks when constructing a civil engineering/building structure. It is about the method. In the present invention, in accordance with the architectural foundation structure design standards of the Architectural Institute of Japan, the term "foundation slab" refers to the footing portion of a footing foundation, and the slab portion of a solid foundation. In addition, the land works are the parts such as gravel, hollows, and piles that are installed below the foundation slab to support the foundation slab, similarly in accordance with the architectural foundation structure design standards.

(Prior art) Conventionally, in solid foundations, the stress within a wide area of the superstructure is transferred to the ground or soil by a single foundation slab, and the slab portion is also used to transfer stress from a single column to the ground by independent footings. In the independent foundation shown in Figure 2-1, the footing part is used to transmit the stress from two or more columns to the ground or to the ground work, but in the composite foundation shown in Figure 2-2, the footing part is However, in the case of continuous foundations and cloth foundations shown in Figures 2-3 and 2-4, where the stress from a wall or a series of columns is transmitted to the ground or soil by means of band-shaped footings, the footings transfer stress from the superstructure, respectively. It is used as a foundation slab to convey information to the ground or land works.

By the way, when constructing this foundation slab, a formwork carpenter assembles a highly rigid formwork such as a wooden formwork or steel formwork based on the blueprint, and pours concrete into this formwork. This was done by removing the formwork after it had set and hardened.

(Problem to be solved) According to the conventional method described above, when assembling the formwork, regardless of the material, it is not necessary to assemble the formwork by a highly skilled carpenter who has received considerable advanced training based on the blueprint. It didn't happen.

In addition, it was necessary to cut and fit the wooden boards especially at the corners of the formwork, and this also required the skills of a carpenter. Furthermore, during concrete pouring, a carpenter was required to be on hand to repair the formwork if it were damaged or warped due to loads such as lateral pressure of the concrete. In addition, it was necessary to remove the mold after the concrete had hardened, and this work had to be carried out again by highly skilled carpenters.

Now, in recent years, the number of young workers entering the construction industry has been decreasing significantly, and at the same time, the number of highly skilled workers such as carpenters is on the decline, as it takes many years to become a full-fledged worker. On the other hand, automation and mechanization of construction technology are progressing at a remarkable pace, and concrete pumps are now used to place concrete, and the speed of various tasks is rapidly increasing.

The present invention was developed in view of the drawbacks of these conventional techniques, which require highly skilled carpenters to build.The present invention aims to provide a method for easily, quickly and reliably constructing foundation slabs with sufficient performance. It is about providing.

(Means for Solving the Problem) The present invention is a method of building a foundation slab using a cloth bag body having a cross section that exceeds the design performance required, in place of the conventionally used assembly formwork. .

That is, the present invention is a method for constructing a foundation slab, which is characterized by injecting concrete from an injection port of a cloth bag to construct a foundation slab having a cloth bag on the outer periphery, and more preferably a semi-water-permeable cloth bag. This method of constructing a foundation slab is characterized by rapidly constructing a foundation slab by injecting concrete through an injection port and expanding a cloth bag. In this way, if the fabric of the fabric bag is semi-permeable, that is, made of fiber that does not permeate concrete but allows water to pass through, moderate dehydration will occur from the surface of the fabric during concrete pouring.
This is preferable because the cloth bag expands while forming hard concrete JW with advanced dehydration on the surface of the cloth.

The configuration of the invention will be explained below with reference to FIG.

The formwork for the base slab of the present invention consists of a cloth bag 1. As shown in FIG. 1-1, for example, the shape has a size that can exceed the cross-sectional area required for the design, and has a concrete injection port 2. Incidentally, a check valve may be attached to this injection port 2 to prevent backflow of concrete. Alternatively, the opening at the top of the bag can be used as the injection port.

Next, this bag is installed on the ground or land works.

At this time, the bag body 1 does not have the shape of a basic slab at all, as shown in FIGS. 1-2, unless a reinforcing material is specially inserted and formed. Of course, reinforcing materials such as reinforcing bars may be attached to the bag in advance to create a cross section that is somewhat similar to the design. Also, in this case - 1, if the land is a pile, it is a good idea to use the cloth at the bottom of the cloth formwork on the reinforcing bars that protrude from the pile.

Now, using the cloth formwork 1 shown in Figure 1-1, concrete 3 is injected into the bag 1 through the injection port 2 using a concrete pump, etc., as shown in Figures 1-2 and 1-3. . The bag body 1 is gradually formed into a foundation slab using this poured concrete.

Finally, the foundation slab will be constructed as shown in Figure 1-4.

This foundation slab satisfies the design-required foundation slab cross section 4.

In addition, even if concrete is poured into the fabric formwork by using the fabric at the bottom of the fabric formwork on the reinforcing bars protruding from the piles, almost no concrete will leak from the actual bottom part of the fabric formwork. A preferred foundation slab is obtained in which a fabric formwork is present on the outer surface of the concrete, and the fabric at the bottom of the fabric formwork is used as a reinforcing bar protruding from the piles, so that the piles and the concrete in the fabric formwork are integrated. It will be done.

(Effects of the invention) First, since a bag made to satisfy the pre-designed cross-section of the foundation slab can be used, there is no need for highly skilled carpenters to assemble or dismantle the formwork on site, which requires a large amount of work. This saves time and also reduces the number of on-site personnel, which is reasonable.

In addition, the material for the formwork is durable and flexible, so any shape can be created.

If the bag is semi-permeable, excess water from the poured concrete will leach out and form a foundation slab made of high-strength concrete.Furthermore, solidification of the concrete involves dewatering outside the city. Can be made quickly.

As described above, by the method of constructing a foundation slab of the present invention, a foundation slab of a free shape can be quickly and easily constructed without the need of a highly skilled carpenter.

[Brief explanation of the drawing]

Figure 1-1 shows the shape of the bag. Figure 1-2 is a diagram showing the bag formwork set up in a predetermined position, Figure 1-3 is a diagram showing concrete being poured from the injection port, and Figure 1-4 is a diagram showing the completed foundation slab. It is. Figure 2 shows independent footings (Figure 2-1), composite footings (Figure 2-2), and continuous footings (Figures 2-3 and 2-4) using conventional tonal or wooden forms. , respectively (a) is a cross-sectional view, and (b) is a plan view. 1...Bag body 2...Injection port 3...Poured concrete 4...Necessary for design Foundation slab cross section patent applicant
Asahi Kasei Corporation Figure 1-1 Figure 1-2 Figure 1-3 Figure 2-1 Figure 2-2 Figure 2-3 Figure 2-4

Claims (1)

[Claims] A method for constructing a foundation slab characterized by pouring concrete through an injection port of a cloth bag to construct a foundation slab having a cloth bag around the outside.