JPH0762674A - Method for constructing precast reinforced concrete foundation block - Google Patents

Abstract

PURPOSE:To provide a precast reinforced concrete foundation block instead of constructing a foundation by a method wherein cement paste is stored in a bank of leveling concrete and a foundation block, wherein grooves are formed all over the bottom surface thereof, is mounted on the cement paste without forming voids therein to join the block and the leveling concrete. CONSTITUTION:In a precast reinforced concrete foundation block 3, concrete is cast into forms wherein specified reinforcing bars are arranged, and grooves 7 are formed on the bottom surface of the block in a lattice-like state and column bars 5 are projected from the upper surface thereof and a suspension hook 6 is embedded therein. Cement paste 4 is stored to a predetermined depth within a bank 2 bonded to a leveling concrete 1 and the block 3 is placed within the bank by means of the hook 6, whereby bonding is effected without forming voids in the concrete 1. A precast reinforced concrete footing beam is mounted between two foundation blocks 3 thus constructed so that the foundation beam and the blocks 3 are connected together by means of cast-in-place concrete utilizing reinforcing bars embedded in the foundation beam at points where the column bars are embedded in the blocks 3.

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 precast reinforced concrete foundation block.

[0002]

2. Description of the Related Art Conventionally, a construction method using cast-in-place concrete has been mainly used to construct a foundation. After arranging reinforcement concrete for foundation concrete and pillar concrete on discarded concrete, a formwork is formed according to the shape of the foundation concrete. It is done by the method of placing and pouring concrete.

[0003]

In the conventional construction method using cast-in-place concrete, since it takes a lot of labor and time to assemble the bar arrangement and the form, it is required to be rationalized. For this rationalization, it is possible to replace the basic concrete with a precast reinforced concrete foundation block, but if the actual foundation block is installed directly on the discarded concrete, a void will be created at the contact surface between the discarded concrete and the foundation block, and the force (vertical The current situation is that the use of precast reinforced concrete foundation blocks has been abandoned because it may not be possible to evenly transmit (force, horizontal force) to the ground.

[0004]

The present invention makes it possible to replace the construction of a conventional cast-in-place concrete foundation with a precast reinforced concrete foundation block by joining the precast reinforced concrete foundation block to the concrete without creating voids. It aims to streamline the work.

That is, according to the present invention, cement paste or high-fluidity cement mortar is accumulated on an inner surface surrounded by a bank provided on abandoned concrete, and a grid-like groove is formed on the entire bottom surface. The present invention relates to a method for constructing a precast reinforced concrete foundation block, which comprises placing a precast reinforced concrete foundation block and then hardening cement paste or high-fluidity mortar.

The first essential point of the present invention is the shape of the bottom surface of the precast reinforced concrete foundation block, in which lattice-shaped grooves are formed on the entire bottom surface. By providing grid-shaped grooves, when the basic block is placed on the concrete to be discarded and joined with cement paste or high-fluidity mortar, the air remaining between the basic block and the discarded concrete is discharged to the outside. The air is easily discharged and the remaining air is trapped in the groove. This prevents the formation of voids on the contact surface between the foundation block and the discarded concrete. The groove engraved on the bottom of the base block is usually about 10 to 40 mm wide and 1 deep depending on the size of the base block.
It is about 0 to 40 mm, and is engraved in a grid pattern at intervals of about 2 to 10 times the width. The side surface of the groove is preferably an inclined surface rather than an upright surface. In any case, a lattice-like groove having a volume sufficient to accommodate the remaining air sandwiched between the foundation block and the discarded concrete is engraved. The intervals of the grooves do not have to be the same on the entire bottom surface, and the central part may be dense and the peripheral part may be rough. Such a bottom-shaped basic block is easily manufactured by providing protrusions corresponding to the mold used during manufacturing.

The second essential point of the present invention is to provide an area surrounded by a bank on abandoned concrete and store cement paste or high-fluidity cement mortar in the area, and use the cement paste or high-fluidity cement mortar as the foundation. This is the point of joining blocks and abandoned concrete. At the time of joining, it is preferable that the cement paste or the high-fluidity cement mortar also enter the groove on the bottom surface of the base block, and therefore sufficient fluidity is required. The height of the embankment provided is about 20 to 60 mm, and 10 to
Store cement paste or high-fluidity cement mortar at a depth of about 40 mm. It is convenient to use an ordinary rubber or plastic tube as the bank, and this tube is adhered to a predetermined place with an adhesive.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings.

FIG. 1 shows an example of a precast reinforced concrete foundation block used in the present invention. (A) is a bottom view, (b) is an elevation view, and (c) is an enlarged bottom view.

The precast reinforced concrete foundation block 3 is manufactured in a factory by placing concrete on a formwork in which predetermined reinforcing bars are laid, and grooves 7 are engraved on the bottom surface in a grid pattern. It is a slope. A column bar 5 projects on the upper surface and a hanging hook 6 is embedded.

FIG. 2 is a perspective view showing an example of construction of a precast reinforced concrete foundation block.

A rubber pipe is bonded as a bank 2 on the discarded concrete 1, and the cement paste 4 is stored in the bank at an average depth of 20 mm. The precast reinforced concrete foundation block 3 is suspended by a crane (not shown) using the suspension hooks 6 and placed on the bank. The cement paste 4 hardens and the precast reinforced concrete foundation block 3 is joined to the discarded concrete 1 without forming voids.

A precast reinforced concrete foundation beam (not shown) is mounted between the two constructed foundation blocks 3 and the reinforcing bars embedded in the precast reinforced concrete foundation beam are located at the column reinforcements embedded in the foundation block 3. Using cast-in-place concrete for connection enables the use of precast reinforced concrete products for the construction of foundation beams, further streamlining the work.

[0014]

As described above, according to the present invention, the precast reinforced concrete foundation block can be discarded and joined to the concrete without forming voids. Therefore, it is possible to replace the conventional on-site work with the precast reinforced concrete foundation block and rationalize the work. .

[Brief description of drawings]

1 shows an example of a precast reinforced concrete foundation block used in the present invention, where (a) is a bottom view and (b) is
Is an elevation view and (c) is an enlarged bottom view.

FIG. 2 is a perspective view showing an example of construction of a precast reinforced concrete foundation block.

[Explanation of symbols]

1 ··· Discarded concrete 2 · · Banks 3 · · Precast reinforced concrete foundation blocks 4 · · Cement paste 5 · · Column reinforcement 6 · · Suspended hooks 7 · · Grooves

Claims (1)

[Claims] 1. A precast reinforced concrete foundation in which cement paste or high-fluidity cement mortar is stored on an inner surface surrounded by a bank provided on abandoned concrete, and a grid-like groove is formed on the entire bottom surface thereof. A method for constructing a precast reinforced concrete foundation block, characterized by hardening cement paste or high-fluidity mortar after placing the block.