JP2643760B2 - How to build foundation beams - Google Patents

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 foundation beam.

[0002]

The foundation beam is constructed by laying split chestnuts at the root of the root, assembling the beam formwork after placing the discarded concrete, and arranging the reinforcing bars and concrete.
The work of assembling the formwork and rebar is under the ground surface, and it is necessary to remove the mold after placing the concrete, so the workability is generally poor, especially when the footing is formed on the foundation beam, the shape becomes complicated. There is a tendency that the assembling work of the formwork is complicated and the construction efficiency is reduced.

The present invention has been made in view of the problem of workability of a foundation beam, and an object thereof is to propose a method for improving workability and work efficiency.

[0004]

In the present invention, a part of stirrup is buried in a beam formwork, and the use of a precast concrete plate which becomes a part of a foundation beam reduces the labor of reinforcing bars. Eliminating the time required for demolding, installing precast concrete plates at a distance equivalent to the width of the footing, and simplifying the cross-sectional shape of the foundation beam by using the footing as the footing, Enables reduction and enhances workability and work efficiency.

At the lower end of the precast concrete plate, a leg having a width larger than the thickness of the main body is formed. One end of the stirrup projects laterally from the lower end of the precast concrete plate, and the other end of the precast concrete plate. It is buried projecting upward from the upper end and is laid in place as it is by installing a precast concrete plate.

[0006] The precast concrete plates are placed on the discarded concrete facing each other at a distance corresponding to the width of the footing, are fixed to the discarded concrete by anchors penetrating the legs, stand up, and resist the lateral pressure of the concrete. It is mutually connected with the opposing precast concrete plate by the space keeping material, and becomes independent.

[0007] After the installation and connection of the precast concrete plate, the lower main bar and the upper main bar are arranged between the precast concrete plates, concrete is poured, and the construction is completed by integrating with the precast concrete plate.

When the precast concrete board is placed on the discarded concrete, it is placed on the discarded concrete at a leg portion having a width larger than the plate thickness of the main body, and is fixed to the discarded concrete by an anchor penetrating the leg portion.
By connecting to the opposing precast concrete plate with the spacing material, it is possible to maintain the upright state as it is, special arrangement for maintaining the precast concrete plate in the upright state when arranging the main reinforcement and placing concrete. No holding member is required, and the temporary work is simplified.

Since the stirrup is buried in the precast concrete plate, only the main reinforcement is required at the site, and the number of operations is reduced by eliminating the need for removal from the mold. In addition, since the completed foundation beam has a square cross-sectional shape, the shape of the precast concrete plate as the formwork is simplified, and the workability of assembling the precast concrete plate is enhanced.

In addition, the foundation beam also functions as a footing,
By having a width equivalent to footing throughout the entire formation, it is possible to reduce the formation, reduce the depth of root cutting, and increase the efficiency of installation work and pre-arrangement work of precast concrete plates from the ground.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention uses a mold as shown in FIG.
The precast concrete plates 1, 1 in which a part of the stirrup 2 is buried are installed facing each other, and the lower main reinforcement 3
In this method, a foundation beam 6 is constructed by arranging the upper main reinforcement 4 and placing concrete 5 between the precast concrete plates 1 and 1.

At the lower end of the precast concrete plate 1, a leg portion 1a having a width larger than the thickness of the intermediate body portion is formed, and at the upper end, a top portion 1b also having a width larger than the thickness of the main body portion is formed. Is done.

A part of the stirrup 2 is embedded in the precast concrete plate 1 as shown in the figure. The stirrup 2 is composed of a pair of reinforcing bars 21, 21 buried in each precast concrete plate 1 and a reinforcing bar 22 laid on site on the upper main reinforcing bar 4, and as shown in FIG. If the size is large, the precast concrete plate 1,1
A core sling 23 is added to the middle part in the opposite direction as necessary.

The reinforcing bars 21 also serve as vertical bars of the precast concrete plate 1, and the end on the upper main bar 4 side projects upward from the top 1 b of the precast concrete plate 1, and the lower main bar 3
The lateral end protrudes laterally from the inner peripheral surface of the leg portion 1a of the precast concrete plate 1 toward the opposing precast concrete plate 1 side, so that a sufficient anchoring length in the concrete 5 is provided. In the case of the embodiment shown in FIG. 2, the core bars 23 are assembled in advance as a reinforcing bar cage and are installed together with the precast concrete plates 1 and 1.

The precast concrete plates 1 and 1 are placed facing each other on the discarded concrete 8 at a distance corresponding to the width of the footing. At the position of the leg 1a of the precast concrete plate 1, an anchor 9 fixed to the discarded concrete 8 protrudes from the top end of the discarded concrete 9, and the precast concrete plate 1 is transferred to the discarded concrete 8 by the anchor 9 penetrating the leg 1a. Be established.

The opposing precast concrete plates 1,
There is an appropriate space in the height direction between
A spacing member 7 that resists the pressure during casting is erected, and the opposing precast concrete plates 1 and 1 are connected to each other. The precast concrete plate 1 is maintained upright on the discarded concrete 8 by the anchor 9 and the spacing member 7. A cotter 11 is formed on the inner peripheral surface of the precast concrete plate 1 to transmit a shearing force as necessary to ensure the integrity with the concrete 5.

The lower main reinforcement 3 is arranged on the reinforcing bar 21 of the stirrup 2, and the upper main reinforcement 4 is arranged on a spacer 10 provided between the upper ends of the tops 1b, 1b of the precast concrete plates 1, 1. After the upper main bar 4 is laid, the reinforcing bar 22 is laid, and both are tied together.

Thereafter, the precast concrete plate 1,
The concrete beam 5 is cast between the two, and the foundation beam 6 is constructed. FIG. 3 shows a plan view of the foundation beam 6, but a discarding formwork 12 is installed at the position of the pillar, and the upper main reinforcement 4 inside the formwork 12.
The lower main reinforcing bar 3 is connected to the upper main reinforcing bar 4 and the lower main reinforcing bar 3 between the precast concrete plates 1 and 1 by lap joints or the like.
At the same time, concrete 5 is poured. In the discarded formwork 12, in addition to the upper main bar 4 and the lower main bar 3, a reinforcing bar basket (not shown) composed of a vertical bar and a horizontal bar is arranged.

[0019]

According to the present invention, a part of the stirrup is buried in the beam formwork, and a precast concrete plate which is a part of the foundation beam is used. Omitted.

In particular, both ends of the stirrup are buried so as to protrude from the upper and lower ends of the precast concrete plate, and are laid in place as they are by installing the precast concrete plate. In addition to the fact that only the reinforcing steel erected between the portions projecting from the upper end of the precast concrete plate is sufficient, the portion projecting from the lower end of the precast concrete plate can be used as a support for arranging the lower main bar.

In addition, since the precast concrete plates are installed at a distance corresponding to the width of the footing from each other, and the footing also serves as the footing, the cross-sectional shape of the footing is simplified and the beam formation can be reduced. And the workability and work efficiency are improved by reducing the root cutting depth.

In addition, the precast concrete plate is placed on the discarded concrete at a leg having a width larger than the plate thickness of the main body portion when installed on the discarded concrete, and is fixed to the discarded concrete by an anchor penetrating the leg. By connecting to the opposing precast concrete plate with the spacing material, it is possible to maintain the upright state as it is, special arrangement for maintaining the precast concrete plate in the upright state when arranging the main reinforcement and placing concrete. No holding member is required, and the temporary work is simplified.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of a foundation beam.

FIG. 2 is a longitudinal sectional view showing an embodiment when the width is large.

FIG. 3 is a plan view showing an example of arrangement of foundation beams.

[Explanation of symbols]

1 …… Precast concrete board, 1a …… Leg, 1b…
... top, 11 ... cotter, 2 ... stirrup, 21 ...
Reinforcing bar, 22 Reinforcing bar, 23 Reinforcing bar, 3 Remaining bar, 4
…… Top main bar, 5… Concrete, 6 …… Foundation beam, 7
…… spacing material, 8… discarded concrete, 9… anchors, 10… spacers, 12… discarded formwork.

Claims (1)

(57) [Claims] 1. A leg portion having a width larger than the thickness of the main body portion is formed at a lower end, a part of a stirrup is buried therein, one end protrudes laterally from a lower end, and the other end extends upward from an upper end. The precast concrete plates that also serve as the formwork that protrude into the concrete are opposed to each other on the waste concrete at a distance equivalent to the width of the footing, and are anchored to the waste concrete with anchors that penetrate the legs to stand up, After connecting the opposing precast concrete plates to each other with a spacing material that resists the side pressure of the above, the lower main bar and the upper main bar are arranged between both precast concrete plates, and the concrete is cast and integrated with the precast concrete plate How to build beams.