JP2002105969A - Foundation structure of building and its construction method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a foundation structure for a building and the construction method therefor capable of improving the site workability of bar arrangement enhancing the constructed quality due to parts manufactured in factories. SOLUTION: The foundation structure for a building is provided with precast concrete struts 2 arranged right under a post position in the building floor face, and footing beams 3 made of cast-in-place concrete placed between the concrete struts 2. The struts 2 are erected so as to raise from the ground and adjacent footing beams 6, 7 are protruded and mutually crossed in the space formed between the ground and the bottom face of the struts 2. The footing bar arrangement 8 is formed at the protruded section of the mutually crossed arranged bars 6, 7 as the feature.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a foundation structure of a building and a construction method thereof.

[0002]

2. Description of the Related Art Conventionally, as a foundation structure of a building,
The one described in JP-A-57759 is known. The foundation structure of this building is formed by casting a precast concrete bundle installed directly below the pillar position in the building floor, side plates installed along the outer circumference of the building floor, and concrete on the entire side plate. A solid foundation to be laid, the bundle comprising anchors connected to the base reinforcements of the solid foundation. According to the foundation structure of the building, it is possible to improve responsiveness to a building plan, installation workability, on-site workability, construction period, responsiveness to soft ground, and the like.

[0003]

However, the prior art described in the above-mentioned publication has a problem in that the set of reinforcing bars connecting the anchoring bars of the bundle to the base reinforcement of the solid foundation is complicated, and the workability on site is poor.

The present invention solves the above-mentioned problems of the prior art,
It is an object of the present invention to provide a foundation structure of a building and a construction method capable of improving the workability of a reinforcement arrangement on site and improving the construction quality by converting parts to a factory.

[0005]

According to the present invention, there is provided a precast concrete bundle disposed immediately below a pillar position in a building floor, and concrete formed between the adjacent bundles by cast-in-place concrete. A base structure of a building having an underground beam, wherein the bundle is installed floating from the ground, and an underground beam reinforcing bar adjacent to a space formed between the ground and the bottom surface of the bundle. Are arranged so as to protrude and intersect each other, and a footing arrangement of the bundle is formed at the protruding portion of the interleaved reinforcing arrangement.

According to a second aspect of the present invention, in the basic structure of a building according to the first aspect, the bundle includes three or more rod-shaped legs projecting downward from a bottom surface, and a lower end of the rod-shaped leg is located on the ground. Characterized in that it is placed on the receiver set in the above.

[0007] The present invention according to claim 3 provides the invention according to claim 1 or 2.
In the foundation structure of the building described above, the underground beam reinforcement is manufactured in advance at a factory, and a main reinforcement tip of the underground beam reinforcement projecting into the space is folded back into a U shape in a horizontal view. It is characterized in that it is formed and can be assembled in such a manner that it intersects with the tip of the U-shaped main reinforcement of the adjacent underground beam arrangement.

According to a fourth aspect of the present invention, there is provided a method of constructing a building foundation, comprising: placing a precast concrete bundle receiver on the ground immediately below a pillar position in a building floor; Place the rod-shaped legs protruding from the bottom and place the bundles off the ground, adjust the level of each bundle top, and at the same time, place each bundle in a predetermined position and install the bundle. The underground girder reinforcement to be provided is installed on the ground, and this reinforcement arrangement tip is intersected with the reinforcement arrangement tip of the adjacent underground beam, and housed in the space formed between the ground and the bundle bottom. Installing the underground beam reinforcement, installing a formwork around the underground beam reinforcement including the bundle, concretely casting concrete in a space surrounded by the formwork, and underground beam and bundle Process of forming footing integrally, embankment on underground beam and bundle footing, backfilling Characterized in that it comprises a step.

[0009] In the present invention, the footing (foo)
(Ting) refers to a spreading part of the foundation.

[0010]

In the foundation structure of a building according to the present invention, the bundle is floated from the ground and installed, and adjacent underground beam reinforcing bars are projected into a space formed between the ground and the bottom of the bundle to intersect each other. Since the footing of the bundle is formed at the projecting portion of the crossed reinforcing bars, the underground beam reinforcing bar will also serve as the footing of the bundle, Workability can be improved.

In the foundation structure of a building according to the present invention, the bundle further includes three or more rod-shaped legs protruding downward from the bottom surface, so that the bundle can stand on the ground with the rod-shaped legs. In addition, since the lower end of the bar-shaped leg is placed on the receiving metal set on the ground, the bundle can be slid on the receiving metal, and horizontal positioning is easy. Therefore, the workability of setting the bundle can be improved. If the protrusion length of the rod-shaped legs can be adjusted, the adjustment of the bundle top end level becomes easy, and the installation workability can be further improved.

In the foundation structure of a building according to the third aspect, since the underground beam reinforcing bars are produced in advance at a factory, it is possible to improve the construction quality by using factory parts together with the precast concrete bundle. it can. In addition, the main reinforcement tip of the underground beam reinforcement projecting into the space may be folded back and formed in a U-shape in a horizontal view, and assembled with the U-shaped main reinforcement tip of the adjacent underground beam reinforcement. Therefore, the bundle footing can be fixed below the bundle via the entanglement caused by the crossing.

According to a fourth aspect of the present invention, there is provided a method of constructing a building foundation, wherein a bar-like leg protruding from a bottom surface of a bundle is placed on a receiving metal, and the bundle is floated from the ground. Since the method includes a bundle setting step of positioning each bundle at a predetermined position, the workability and accuracy of the bundle setting can be improved. In addition, the reinforcing bar tip of the underground beam is entwined with the reinforcing bar tip of the adjacent underground beam, and is installed in a space formed between the ground and the bottom of the bundle. Since the arrangement step is provided, the underground beam arrangement also serves as a bundle footing arrangement, and the workability of the arrangement of the arrangement at the site can be improved. Further, the method further comprises a step of installing a formwork around the underground beam reinforcement including the bundle, and casting concrete in a space surrounded by the formwork to integrally form the underground beam and the bundle footing. As a result, the load acting on the bundle can be reliably transmitted to the underground beam via the bundle footing, and at the same time, the workability at the site can be improved.

[0014]

Embodiments of the present invention will be described below in detail with reference to the drawings. 1 to 12
Fig. 1 is an embodiment of the present invention, Fig. 1 is a perspective view showing a part of a building foundation in which a solid foundation is cut away, and Fig. 2 is a cross-sectional view taken along line Y-Y in Fig. 1; FIG. 3 is a perspective view showing the bundle and the underground beam arrangement, FIG. 4 is a plan view showing the entire building foundation, FIG. 5 is a perspective view of the building unit, and FIG. FIG. 7 is a perspective view of a bundle to which a side plate is attached, FIG. 8 is an explanatory diagram showing footing arrangement of the bundle, and FIG. 9 is a perspective view of an underground beam arrangement. FIG. 10 is an explanatory view showing a footing arrangement of a T-shaped bundle, FIG. 11 is an explanatory view showing footing arrangement of a cross-shaped bundle, and FIG. 12 is an explanatory view showing a construction method of a building foundation. .

The foundation 1 shown in FIG. 1 is an enlarged view of a portion A of the foundation 1 shown in FIG. 4, and is, for example, a building unit 10 (wood-based wooden unit) shown in FIG. Unit may be used)
The load is transmitted to the ground.

The building unit 10, as shown in FIG.
This is a skeleton structure in which a floor beam 11, a ceiling beam 12, and a column 13 are joined in a box shape, and has a rectangular shape in plan view.

The foundation 1 is, as shown in FIGS. 1 and 4,
Between the bundle 2 (2A, 2B) made of precast concrete arranged immediately below the position of the pillar 13 (the pillar 13 arranged at the four corners of the building unit 10) in the building floor, and the adjacent bundle 2-2A ( Or between 2-2, 2-2B, 2A-
An underground beam 3 formed by casting concrete in-situ between 2B), a side plate 4 installed along the outer periphery of the building floor,
The entire base including the bundles 2 and 2A in the side plate 4 is provided with a solid foundation 5 formed by casting concrete in place. The underground beam 3 is placed in the excavated ground, cast in place on concrete, and then backfilled and buried underground.

The bundle 2 (the bundles 2A and 2B are the same) is shown in FIG.
As shown in FIG. 3, adjacent underground beam reinforcing bars 6 and 7 are installed in a space formed between the ground and the bottom surface of the bundle 2 so as to protrude from the ground and intersect with each other. The footing reinforcing bars 8 of the bundle 2 are formed at the projecting portions of the crossed underground beam reinforcing bars 6 and 7 (see FIG. 8).

The bundle 2 is formed in an L-shape in plan view and installed at a corner of a building, and the bundle 2A is formed in a T-shape in plan view.
The bundle 2B is installed at the corner of two adjacent building units 10 and 10, and is formed in a cross shape in a plan view, and is installed at the corner where three or four building units 10 abut. As shown in FIG. 3, the bundle 2 includes three rod-shaped legs 21 projecting downward from the bottom surface, and the lower end of the rod-shaped legs 21 is placed on a receiving metal 25 installed on the ground. . Although not shown, the T-shaped bundle 2A is
Similarly, the cross-shaped bundle 2B includes four rod-shaped legs 21 projecting downward from the bottom surface, and three rod-shaped legs 21 projecting downward from the bottom surface.
Are placed on a receiver 25 installed on the ground.

As shown in FIG. 6, each of the rod-shaped legs 21 can be adjusted in level, and includes a long bolt shaft 22 and a pipe embedded in the bundle 2 and into which the bolt shaft 22 is inserted. 23. The bolt shaft 22 is
A screw part 22A is provided at one end, and a hanging tool 22B is provided at the other end. The pipe 23 is buried with one end flush with the top end of the bundle 2 and the other end to which the nut 23A is welded is projected from the bottom surface of the bundle 2, and a washer 23B is provided at a position supporting the bottom surface of the bundle 2. Is provided. The bolt shaft 22 is inserted from above the pipe 23, and the screw portion 22A is
The bundle 2 is screwed into 3A, and the tip of the screw portion 22A is projected from the nut 23, whereby the level of the bundle 2 can be adjusted.

The side plate 4 installed along the outer periphery of the building floor is made of precast concrete, and as shown in FIG. 7, a joint fitting 41 provided at a corner where the bundle 2 and the side plate 4 abut against each other. Joined.

The underground beam reinforcements 6 and 7 are manufactured in advance in a factory, and as shown in FIG. 9, the underground beam reinforcement 6 is located on the long side (girder side) of the building unit 10. Installed along
The underground beam reinforcement 7 is installed along the short side (wife side) of the building unit 10. These underground beam reinforcing bars 6 (7) include main reinforcing bars 61, 61 (71, 71) on the left and right sides facing the longitudinal direction,
A plurality of auxiliary muscles 62, 62,... (7) are provided between the main muscles 61, 61 (71, 71) in the direction orthogonal to the longitudinal direction.
2, 72,...). The underground beam reinforcement 6 on the girder side is
Main bar 61 projecting into the space between the bottom surface of the bundle 2 and the ground
Of the U-shaped main reinforcement 71 of the underground beam reinforcement 7 on the adjacent wife's side so as to be orthogonally crossed and assembled.

In the case of the L-shaped spar 2, as shown in FIG. 8, the underground beam reinforcing bars 6 and 7 have their tips crossed at right angles, and the crossing portions form footing reinforcing bars 8 of the bundle 2. And assembled. In the case of a T-shaped girder 2A, FIG.
As shown in (1), the tip portions of the three underground beam reinforcing bars 6, 6, 7 are crossed with each other in a T-shape, and the crossing portion forms and assembles the footing reinforcing bar 8A of the bundle 2A. Further, in the case of the cross-shaped girder 2B, as shown in FIG. 11, the tips of the four underground beam reinforcing bars 6, 6, 7, 7 are crossed with each other in a cross shape, and the crossed portion of the bundle 2B is crossed. The footing reinforcement is formed and assembled.

Next, a method of constructing the foundation 1 having the above configuration will be described step by step with reference to FIG. (1) The receiving metal 25 and the underground beam reinforcing bars 6 and 7 are installed on the ground immediately below the pillar positions in the building floor (FIG. 12).
(B) See FIG.). (2) Connect the tip of the underground beam reinforcement 6 to the adjacent underground beam reinforcement 7
(See FIG. 12 (b)).

(3) The bundles 2, 2 A, and 2 B are suspended by using the suspenders 22 B, and the bundles 2, 2 A, and 2 B are placed on the
The rod-shaped legs 21 protruding from the bottom surfaces of A, 2B are placed, and the bundles 2, 2A, 2B are floated from the ground and installed. And
The crossed ends of the underground beam reinforcements 6, 7 are accommodated in a space formed between the ground and the bottom surfaces of the bundles 2, 2A, 2B (see FIG. 12 (c)). (4) The level of the top end of each bundle 2, 2A, 2B is adjusted by rotation of the bolt 22, which is a component part of the rod-shaped leg 21, and at the same time, each bundle 2, 2A, 2B is slid on the receiving metal 25. It is positioned at a predetermined position, and the installation accuracy of the bundles 2, 2A, 2B is adjusted. At this time, simultaneously with the installation of each bundle 2, 2A, 2B, by temporarily fixing the anchor bolts 24 protruding from the top end with an anchor ruler (made of steel), dimensions between the anchors can be secured, and movement after the installation is also possible. Absent.

(5) The side plate 4 is installed along the outer periphery of the building floor, and the bundles 2 and 2A and the side plate 4 are fixed using the joint metal 41 (see FIG. 12 (d)). (6) Underground beam reinforcement 6, including around the bundles 2, 2A, 2B
A formwork (not shown) is set around 7 and concrete is cast in the space surrounded by the formwork to form an underground beam 3 integrated with the bundle footing (see FIG. 12 (e)). ). (7) Concrete is cast on the entire area of the building floor surrounded by the side plates 4 to form the solid foundation 5 shown in FIG.
The reinforcement of the solid foundation 5 is provided on site. (8) Finally, back around the underground beam 3 and the bundle footing, and complete the construction of the foundation 1.

(Operation of the Embodiment) Foundation 1 of the building of this embodiment
The structure is such that the bundle 2 is floated from the ground and installed, and adjacent underground beam reinforcing bars 6 and 7 are protruded and installed in a space formed between the ground and the bottom surface of the bundle 2 so as to intersect each other. Since the footing reinforcing bars 8 of the bundle 2 are formed by projecting portions of the crossed reinforcing bars 6 and 7, the bundle 2 is formed by the underground beam reinforcing bars 6 and 7.
The footing 8 also serves as the footing arrangement 8, and the workability of the arrangement of the arrangement on the spot can be improved.

Further, since the bundle 2 is provided with three or more rod-shaped legs 21 projecting downward from the bottom surface, the bundle 2 can stand on the ground by the rod-shaped legs 21. In addition, since the lower end of the rod-shaped leg 21 is placed on the receiver 25 installed on the ground, the bundle 2 can be slid on the receiver 25,
Horizontal positioning is easy. Therefore, the installation workability of the bundle 2 can be improved. In addition, since the protrusion length of the rod-shaped leg 21 can be adjusted by rotating the bolt 22, the level of the top end of the bundle 2 can be easily adjusted, and the installation accuracy can be improved and the installation workability can be further improved.

The foundation 1 structure of the building of the present embodiment further includes:
Since the underground beam reinforcing bars 6 and 7 are produced in advance in a factory, the construction quality can be improved by using the precast concrete bundle 2 as a factory component. In addition, the tip of the main reinforcement 61 of the underground beam reinforcing bar 6 projecting into the space is formed by folding back into a U-shape in horizontal view, and intersects with the tip of the U-shaped main reinforcement 71 of the adjacent underground beam reinforcement 7. The bundle footing can be fixed below the bundle 2 through the entanglement due to the crossing.

According to the method of constructing the foundation 1 of this embodiment, since the foundation structure after construction can be configured in the same manner as the foundation 1 of the above embodiment, the same operation as described above is achieved.

The embodiments of the present invention have been described above. However, the present invention is not limited to the above-described embodiments, and is included in the present invention even if there is a design change or the like without departing from the gist of the present invention. . For example, although the foundation 1 of the present embodiment is provided with the solid foundation 5, the solid foundation 5 may not be provided.
At this time, it is preferable to widen the underground beam 3 so as to increase the overhang of the footing of the bundle 2. Further, although the side plate 4 is provided along the outer periphery of the building floor, the side plate 4 may be provided only on the outer periphery on the girder side. Furthermore, bundles 2, 2
A and 2B are provided immediately below the columns, but an auxiliary bundle may be provided between the columns on the spar side.

[0032]

According to the foundation structure of a building according to the first aspect, the underground beam reinforcing bar also serves as a footing reinforcing bar for the bundle, and the workability of the reinforcing bar on-site can be improved.

In the foundation structure of the building according to the second aspect, the bundle can be self-supported on the ground and the bundle can be slid on the receiving metal, so that horizontal positioning is easy. Therefore, the workability of setting the bundle can be improved.

According to the third aspect of the present invention, since the underground beam reinforcement is manufactured in advance at a factory, it is possible to improve the construction quality by using precast concrete bundles as factory parts. it can.

The construction method of a building foundation according to the fourth aspect is a construction method of a building foundation similar to the foundation structure according to the first to third aspects, and thus has the same effect as described above.

[Brief description of the drawings]

FIG. 1 is an embodiment of the present invention and is a perspective view showing a part of a building foundation in which a solid foundation is cut out.

FIG. 2 is a sectional view taken along line YY of FIG.

FIG. 3 is a perspective view showing a bundle and underground beam arrangement.

FIG. 4 is a plan view showing the entire building foundation.

FIG. 5 is a perspective view of a building unit.

FIG. 6 is an exploded sectional view showing the bundle.

FIG. 7 is a perspective view of a bundle to which a side plate is attached.

FIG. 8 is an explanatory view showing footing arrangement of a bundle.

FIG. 9 is a perspective view of an underground beam arrangement.

FIG. 10 is an explanatory view showing footing bar arrangement of a T-shaped bundle.

FIG. 11 is an explanatory diagram showing footing bar arrangement of a cruciform bundle.

FIG. 12 is an explanatory diagram showing a construction method of a building foundation.

[Explanation of symbols]

 DESCRIPTION OF REFERENCE NUMERALS 1 foundation 2, 2A, 2B precast bundle 21 rod-shaped leg 25 catch 3 underground beam 4 side plate 5 solid foundation 6, 7, underground beam reinforcement 61, 71 main reinforcement 8 bundle reinforcement

Claims (4)

[Claims] 1. A foundation for a building having a precast concrete bundle placed immediately below a pillar position in a building floor and an underground beam formed by casting concrete between the adjacent bundles. In the structure, the bundle is installed floating from the ground, and the underground beam reinforcement is projected and intersected with each other in a space formed between the ground and the bottom of the bundle, and the bundle is installed. The foundation structure of a building characterized by forming a footing reinforcement arrangement of a bundle at the protruding portion of the reinforcement arrangement. 2. The method according to claim 1, wherein the bundle includes three or more rod-shaped legs protruding downward from a bottom surface, and a lower end of the rod-shaped legs is placed on a receiver installed on the ground. The foundation structure of the building according to claim 1. 3. The underground beam reinforcing bar is manufactured in advance at a factory, and a main bar tip end of the underground beam reinforcing bar projecting into the space is formed by folding back into a U shape in a horizontal view, The foundation structure of a building according to claim 1 or 2, wherein the base structure can be assembled by being crossed with a tip of a U-shaped main reinforcing bar of an adjacent underground beam reinforcing bar. 4. A precast concrete bundle receiver is placed on the ground immediately below the pillar position in the floor of the building, and a bar-like leg projecting from the bottom of the bundle is placed on the receiver to lift the bundle off the ground. At the same time as adjusting the top of each bundle and adjusting the level of each bundle at the same time, setting the bundle to align each bundle at a predetermined position, and installing the underground beam reinforcing bars provided between adjacent bundles on the ground, Part, intersecting with the reinforcing bar tip of the adjacent underground beam, installing the underground beam reinforcing bar to be housed and installed in the space formed between the ground and the bottom of the bundle, Forming a formwork around the underground beam reinforcement including the underground beam, casting concrete in the space surrounded by the formwork in-situ, and forming the underground beam and bundle footing integrally, Laying on the top and backfilling the building Law.