JP2759131B2 - Foundation beam construction method for steel reinforced concrete columns - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a foundation beam construction method implemented in the field of constructing a foundation beam of a building, particularly a steel reinforced concrete (hereinafter referred to as SRC) foundation beam.

Conventional technology Conventionally, when constructing a foundation beam of SRC structure, the purpose is to reduce the cross section of the steel frame member as much as possible due to the tightness of the steel frame due to the increase in the amount of construction work in recent years. It is common practice to embed a steel column portion (O-node portion) of a column base into a foundation beam to compensate for insufficient strength. For each column-base steel frame, a connecting beam (temporary beam) is inserted between adjacent ones, or a tiger rope with a round rope wire is stretched for each column-base steel frame to improve the construction accuracy. It is being ensured.

Regarding temporary support of the upper main bar of the foundation beam, a beam main bar receiving horse, which is a commercially available or custom-made product, is installed, or a single pipe is laid between reinforcing bar scaffolds installed on both sides of the foundation beam. Methods for on-site construction are being implemented.

Further, as a scaffold for assembling reinforcing bars and a scaffold for placing concrete, it is generally practiced to temporarily provide a framework scaffold or a single-pipe scaffold.

Problems to be Solved by the Present Invention In the case of the above-mentioned conventional foundation beam construction method, securing of the column base steel frame construction accuracy, provisional support of the foundation beam upper main reinforcement, and provisional installation of the work scaffold are individually performed. Are performed as independent structures and processes. Therefore, it requires not only a large number of temporary materials, but also a lot of man-hours and labor, which is extremely disadvantageous for labor saving and labor saving, and it is difficult to shorten the construction period. It has become.

Therefore, an object of the present invention is to rationalize and secure the securing of the construction accuracy of the column base steel frame portion, the provisional support of the main reinforcement at the upper end of the foundation beam, and the securing of the work scaffolding in a systematic manner. It is to provide an improved foundation beam construction method.

Means for Solving the Problems As means for solving the problems of the prior art, a steel reinforced concrete foundation foundation construction method according to the present invention is, as shown in the preferred embodiment in the drawings, a steel reinforced concrete column 2 ′. A connecting beam 3 is arranged at a predetermined height between the column-base steel frame portions 2 buried in the foundation beam 1, and a bar-like member for temporarily receiving the main reinforcement 4 at the upper end of the foundation beam is provided on the connecting beam 3. The beam main bar receiver 5 was installed as one protruding a sufficient length to the side. The main reinforcing bar 4 is supported on the beam reinforcing bar receiver 5 to assemble the foundation beam reinforcing bar 6, and a scaffold plate 7 for reinforcing bar scaffolding and concrete scaffolding is provided on a side portion of the beam reinforcing bar receiver 5. I do.

The construction accuracy of the column base steel frame 2 is sufficiently ensured in the connection work with the connection beam 3.

By appropriately setting the height position of the connecting beam 3 in advance, the height of the beam main bar receiver 5 installed on the connecting beam 3 can be set as the height position of the upper main beam 4 of the foundation beam. Therefore, the main beam 4 at the upper end of the foundation beam is immediately placed on the beam main bar receiver 5, and the foundation beam reinforcement 6 can be assembled.

Further, by laying the scaffold plate 7 on the side portion of the main beam support 5, it can be used immediately as a work scaffold.

Embodiment Next, the illustrated embodiment of the present invention will be described.

FIGS. 1 and 2 show the outline of the implementation of the foundation beam construction method according to the present invention, in which the SRC foundation beam 1 is constructed on a discarded concrete (base concrete) 8. . In the figure, reference numeral 10 denotes a slab. The steel base portion 2 of the SRC column 2 ′ erected on the SRC foundation beam 1, particularly the column base portion 2 buried in the foundation beam 1, has the column base plate 2 a discarded and anchor bolts in the concrete 8. 9 is fixed. The column-base steel frame portion 2 is usually a cross-shaped steel frame having a cross-shaped cross section and a flange plate welded to each end portion in order to make the steel frame cross-section as small as possible. The construction accuracy of the column base steel frame portion 2 is sufficiently adjusted and secured in the joining work with the connecting beams 3 arranged between each other.

The connecting beam 3 is a lightweight channel (or other shaped steel) having a cross section of about 100 × 50 mm, and is disposed on the concrete 8 discarded by several columns 11 equally arranged in the longitudinal direction. Supported horizontally. In particular, the connecting beam 3 is required to be installed at the height position of the main reinforcing bar 4 at the upper end of the foundation beam, so that the level adjusting bolts 12 provided at the lower ends of the columns 11 are operated to set the connecting beam 3 at the appropriate height position. Be placed. Thereafter, the connecting beam 3 is joined to the column base steel frame portion 2 to contribute to ensuring the accuracy of its construction. The connecting beam 3 is arranged substantially at the center of the cross section of the foundation beam (FIG. 2).
In this connecting beam 3, at some position in the longitudinal direction,
Holes to improve the filling of concrete to be cast later
3a ... are provided.

On the upper surface of the connecting beam 3, a beam main bar receiver 5 using an angle or the like is installed at a distance of about several meters in the longitudinal direction so as to protrude sufficiently long in the horizontal direction and in the width direction of the foundation beam 1. Have been. The main beam support 5 is usually a connecting beam 3
It is fixed by welding. The upper surface of the main beam support 5 is exactly equal to the height of the upper main bar 4 of the foundation beam.
Are supported, and the foundation beam reinforcing bar 6 is assembled.

In addition, the portion of the beam main reinforcement receiver 5 that protrudes, for example, about 25 cm long on both sides (or one side) in the width direction of the foundation beam cross section,
First, the tip is discarded and solidly connected by a clamp 14 to a single pipe column 13 standing on concrete 8 to form a support at both ends, and a scaffold plate 7 is erected on the protruding portion. Accordingly, it can be used as a scaffold for assembling the foundation beam reinforcing bar 6, and thereafter, the SR is performed by installing the side formwork 15.
A scaffold for concrete placement of the C-structure foundation beam 1 is secured.

Since the connecting beam 3 is a temporary material having the above-mentioned use and function, it is not limited to the case where the channel steel is embodied in the downward direction as shown in FIG. 2 or FIG. 3 or upward as shown in FIG. 3B. In some cases, the present invention may be implemented in a horizontal orientation as shown in FIG. 3C.

Advantageous Effects of the Present Invention As described in detail in conjunction with the embodiments above, according to the method for constructing a steel-frame reinforced concrete foundation beam according to the present invention, a column-base steel frame portion embedded in the foundation beam 1 From the construction of 2 and securing its accuracy to the installation of the main beam support 5 and the securing of work scaffolding, it can be implemented in a systematic and rationalized, compounded configuration, so that temporary materials can be greatly saved, Labor saving and labor saving can be achieved by omitting man-hours and labor, and significant benefits can be obtained in drastic cost reduction and shortening of construction period by rationalization work. It greatly contributes to the improvement of work safety and quality.

[Brief description of the drawings]

FIG. 1 is an explanatory view simply showing from a front direction the procedure for carrying out a foundation beam construction method according to the present invention, and FIG. 2 is II- in FIG.
FIG. 3 is an enlarged sectional view of the structure taken along line II, and FIG.
A, B and C are elevation views showing different embodiments of the connecting beam. 2 '... SRC column, 1 ... SRC foundation beam 2 ... steel column base, 3 ... connecting beam 4 ... foundation beam upper main reinforcement, 5 ... beam reinforcement reinforcement 6 ... foundation beam reinforcement, 7 ... … Scaffold board

Claims (1)

(57) [Claims] 1. A connecting beam is disposed at a predetermined height position between column-base steel frames buried in a foundation beam of a steel-framed reinforced concrete column, and a top main reinforcement of a foundation beam is temporarily supported on the connecting beam. The main beam reinforcement to be installed is set as one that protrudes sufficiently long to the side, the main reinforcement is supported on this main beam reinforcement, and the foundation beam reinforcement is assembled. And a scaffold plate for a concrete scaffold is erected.