JPH0610359A - Construction method for foundation structure - Google Patents

Abstract

PURPOSE:To enhance the efficiency of construction work for a foundation structure of a building, save energy and reduce work period as well. CONSTITUTION:A ground 11 is excavated to a specified level so as to construct a foundation structure which comprises a foundation pile 12, a column 13 to be connected and a foundation beam 15 or the like and then, sub-slab concrete 16 is horizontally cast in order to contain the head of the pile 12. A groove 8b which receives a form 17 which forms both sides of the foundation beam 15 is installed at a specified position on the sub-slab concrete 16 while a precast concrete-made material A for the bottom of a beam is set where reinforcing bars 9 and 10 are partially installed projectively. After reinforcing bars 18 to 22 designed for the column 13 and the foundation beam 15 are assembled, the casting form 17 and the like are assembled and them concrete 23 is cast.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of constructing a foundation structure including columns and foundation beams which are connected to foundation piles of a building.

[0002]

2. Description of the Related Art FIG. 4 shows an example of a conventional method of constructing a substructure. In the figure, 1 is the ground, 2 is a building pillar, 3 is a reinforcing bar protruding from the pillar 2, and 4 is a pillar. 2 is a footing at the base, 5 is a formwork for a conventional foundation beam installed between columns 2 and 2, 5a is a formwork for the beam bottom, 6 is a support for supporting the beam bottom, 7 is a foundation beam 5 It is a reinforcing bar protruding above.

That is, in the conventional method of constructing a foundation structure, after constructing a pile (not shown), the periphery of the pile is excavated to a predetermined level to perform pile head treatment, and then the foundation beam construction position. Is excavated, the discarded concrete 5b is placed on the surface 1a facing the bottom of the foundation beam, and the concrete 1a is placed on the bottom 1b of the footing 4 to perform positioning. After that, a scaffold (not shown) for reinforcing the pillar 2 and a scaffold (not shown) for reinforcing the basic beam are constructed, and the reinforcement of each part is performed, and after the reinforcement, the formwork is assembled and concrete is placed. Was.

[0004]

As shown in FIG. 4, a conventional method of constructing a substructure is to construct a beam bottom form 5a on the ground 1 between the footings 4 and 4 in accordance with the beam bottom level. Since the formwork 5a is installed and supported by the support work 6 and the like, there is a problem that the work is complicated. Further, in the conventional construction method, since there is a step between the foundation beam bottom 5b and the bottom 4a of the footing 4 and a scaffold for reinforcing bars is required, it is difficult to move the material horizontally and it is necessary for temporary work. There is a problem that it requires a lot of labor.

[0005]

As a method for constructing a substructure of the present invention in order to solve the above problems, first, the ground is root-cut down to a predetermined level, and then the concrete is discarded so as to include a pile head. For the beam bottom made of precast concrete that has the receiving groove of the formwork that forms both sides of the foundation beam at a predetermined position on this discarded concrete, and has some reinforcing bars protruding. After setting the members, and then assembling the reinforcing bars for columns and foundation beams, after assembling the driving form, concrete is poured.

[0006]

As described above, in the present invention, since the discarded concrete including the pile head is placed horizontally without providing the steps, the materials and the workers can be easily moved, and the waste water can be easily treated.

Further, according to the present invention, the reinforcement of the column can be performed through the column reinforcement self-supporting metal member which is erected on the aforesaid concrete, and the reinforcement of the beam portion is for the beam bottom made of precast concrete. This can be done by connecting to the reinforcing bar of the member, and the form can also be easily assembled by using the driven form, so temporary scaffolding is not required, and labor saving and shortening of the construction period can be achieved.

Further, according to the present invention, since the beam bottom formwork and the supporting work which are conventionally required are not required, the work is simplified and the work efficiency is improved. Further, since the beam bottom member formed integrally is used, positioning of the beam is easy and the bar arrangement accuracy is improved. For this reason, the work of re-arranging the bar is eliminated and labor can be saved.

Further, according to the present invention, the formwork for the side wall of the beam is set by inserting the lower end edge of the driving formwork into the receiving groove provided in the beam bottom member and setting the formwork on both sides. Since it is not necessary to place concrete between them and remove the formwork, work efficiency is improved and labor saving can be promoted.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 3 shows an embodiment of a beam bottom member used in the present invention, in which the beam bottom portion 8 of the foundation beam is formed from precast concrete as a plate-shaped body having a rectangular planar shape, and both sides thereof are The long side portions are respectively projected upward, and the receiving groove 8b of the form forming the both side surfaces of the beam is formed in the central portion of the upper surface of the protrusion 8a, and a part of the reinforcing bars 9 and 10 of the beam is made of concrete. The member A for the beam bottom of the foundation beam is integrally formed by projecting from the member 8. In addition, 8c is a projection which substitutes for the support work projecting at the four corners of the bottom surface of the concrete member 8.

1 and 2 show the construction method of the present invention, in which 11 is the ground, 12 is the head of the foundation pile, and
2a is a reinforcing bar of the pile, 13 is a column connecting to the head 12 of the foundation pile, 14 is a footing, and 15 is a foundation beam (underground beam).

In this embodiment, in order to construct a foundation structure consisting of columns 13 and foundation beams 15 connected to foundation piles 12, first, the ground 11 is root-cut down to a predetermined level, and then the pile heads 12 are removed. The waste concrete 16 is placed horizontally so as to include it, and at a predetermined position on the waste concrete 16, there is a receiving groove 8b for the formwork 17 (see FIG. 2) that forms both side surfaces of the foundation beam 15 and reinforcement is performed. A beam bottom member A made of precast concrete in which a part of the streaks 9 and 10 is provided is set.

Next, as shown in FIG. 1, the base reinforcement 1 is placed at a predetermined position on the waste concrete 16 above the pile head 12.
8 is set, and at the center of it is a column reinforcement self-supporting hardware 1
9 is set up, and the reinforcing bar 20 for the pillar 13 is assembled around it.

Further, as shown in FIG. 2, after assembling the reinforcing bars 21 and 22 of the beam by connecting to the reinforcing bar 9 protruding from the beam bottom member A, it is driven into the receiving groove 8b of the beam bottom member A. After inserting the lower edge of the frame 17 to set the driving form 17, and also to set other forms (not shown) for forming the pillars 13, the footings 14, etc., the concrete 23 is placed in these forms. To place.

Reference numeral 24 in FIG. 2 is a trench pit, 2
Reference numerals 5 and 26 are precast concrete plates surrounding the trench pits 24, 27 is a precast concrete plate provided on the driving mold 17 on the opposite side of the trench pits 24, and 28 is backfilled earth and sand.

[0016]

As described above, in the present invention, the pile head 1
Since the waste concrete 16 including 2 is cast horizontally without providing a step, the material and the worker can be easily moved, and the wastewater treatment can be easily performed.

Further, according to the present invention, the reinforcement of the columns 13 can be performed through the column reinforcement self-supporting hardware 19 which is erected on the abandoned concrete 16, and the reinforcements 21 and 22 of the beam portion are also precast concrete. This can be easily done by connecting it to the reinforcing bar 9 of the beam bottom member A made of, and the formwork can also be easily assembled by using the driven formwork, so that a temporary scaffold is not required, which saves labor and construction period. It is possible to obtain the effect of shortening.

Further, according to the present invention, since the beam bottom formwork and the supporting work which are conventionally required are not required, the work is simplified and the work efficiency is improved. Further, since the beam bottom member A formed integrally is used, positioning of the beam is easy and the bar arrangement accuracy is improved. For this reason, the work of re-arranging the bar is eliminated and labor can be saved.

Further, according to the present invention, the mold 17 for the side wall of the beam is set by inserting the lower end edge of the driving mold 17 into the receiving groove 8b provided in the member A for beam bottom. Since it is not necessary to pour concrete between the molds on both sides and remove the molds, the working efficiency is improved and labor saving can be promoted.

[Brief description of drawings]

FIG. 1 is an elevational view showing a method for constructing a substructure of the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is a perspective view showing an embodiment of a beam bottom member of the present invention.

FIG. 4 is an elevation view showing an example of a conventional foundation beam construction method.

[Explanation of symbols]

 1 Ground 2 Pillar 3 Reinforcing bar 4 Footing 5 Formwork 5a Beam bottom formwork 6 Support work 7 Reinforcing bar 8 Beam bottom part (concrete member) 8a Projection 8b Receiving groove 8c Protrusion 9 and 10 Reinforcing bar A Beam bottom member 11 Ground 12 Head of foundation pile (foundation pile, pile head) 13 Column 14 Footing 15 Foundation beam (underground beam) 16 Abandoned concrete 17 Formwork (driving formwork) 18 Base reinforcement 19 Column reinforcement Self-supporting hardware 20, 21, 22 Reinforcing bar 23 Concrete 24 Trench pit 25, 26, 27 Precast concrete plate 28 Backfilled earth and sand

Claims (1)

[Claims] 1. In order to construct a foundation structure consisting of columns and foundation beams that are connected to foundation piles, first, the ground is cut to a predetermined level, and then the discarded concrete is leveled so as to include the pile heads. A beam bottom member made of precast concrete that is placed and has a receiving groove of a formwork that forms both side surfaces of the foundation beam at a predetermined position on this discarded concrete, and a part of the reinforcing bar is projected. Then, after assembling the reinforcing bars for columns and foundation beams, after assembling the driving formwork, the concrete is placed, and the method for constructing the foundation structure.