JP7229667B2 - How to build the foundation structure - Google Patents

Description

In the present invention, a pile buried in the ground, a steel pipe portion formed in a tubular shape surrounding the pile head of the pile and filled with concrete inside, and a column built above the pile head are joined. The present invention relates to a method for constructing a foundation structure having a steel frame beam section penetrating the steel pipe section and extending sideways.

Conventionally, a foundation structure is known in which a steel frame beam penetrates a tubular steel pipe portion that is filled with concrete and functions as a footing and extends sideways (for example, Patent Document 1 and 2). In such a conventional foundation structure, a concave notch portion is formed in the upper side portion of the steel pipe portion. The portion is inserted from above (see FIG. 2 of Patent Document 1 and FIG. 7 of Patent Document 2, etc.).

Japanese Patent Application Laid-Open No. 2002-220842 JP 2017-008543 A

As described above, when a steel frame beam such as an H-shaped steel is inserted from above into the recessed notch formed in the upper side of the steel pipe, the notch is formed after the steel beam is inserted. A gap will be formed between the side edge and the web of the steel beam. Therefore, after the steel frame beam is inserted into the notch, it is necessary to join another member to close the gap. The work of joining separate members to close such a gap is a factor that hinders cost reduction and shortening of the construction period, and furthermore, there is a problem of strength reduction due to an increase in the number of welding points.

In view of this situation, the main object of the present invention is to provide a foundation structure in which steel beams extend sideways through tubular steel pipes that are filled with concrete and function as footings. The point is to provide technology that enables rational and high-quality construction so that cost reduction and construction period can be shortened.

A first characteristic configuration of the present invention is a pile buried in the ground,
a steel pipe portion formed in a tubular shape surrounding the pile head of the pile and filled with concrete;
A cross-shaped steel beam in plan view made of H-shaped steel having upper and lower flanges and webs, with a column portion erected above the pile head being joined and extending sideways through the steel pipe portion. A method for constructing a foundation structure comprising:
The steel pipe portion is composed of a plurality of steel plates arranged in parallel in the circumferential direction, and the plurality of side edge portions are connected to the joint portion other than the through portion at the position of the joint portion that is the through portion of the steel frame beam portion. welded together,
The steel beam is inserted from the side into both side edges of each of the plurality of steel plates to form a notch along the outer periphery of the flange and web of the steel beam,
inserting the steel beam portion into the notch portion of the steel pipe portion from the side, and welding and joining the steel beam portion inserted from the side to the steel pipe portion;
As the steel plates constituting the steel pipe portion, flat steel plates are used as they are without being bent .

According to this configuration, the tubular steel pipe portion that is filled with concrete and functions as a footing is a joint portion in which the side edges of a plurality of steel plates arranged in parallel in the circumferential direction are positioned to penetrate the steel frame beam portion. It can be configured by joining with. Then, the plurality of steel plates are arranged side by side in the circumferential direction in such a manner that steel frame beams made of shaped steel such as H-shaped steel are inserted from the side into notches formed in the side edges of the plurality of steel plates. , the side edge portions of the plurality of steel plates arranged side by side can be joined to construct a tubular steel pipe portion. Therefore, at the point where the steel frame beam penetrates through the steel pipe, a notch is formed along the outer circumference of the steel frame beam, so it is possible to suppress the occurrence of a gap that should be closed by joining another member later. As a result, the welding work can be simplified and the amount of welding can be reduced.
Therefore, according to the present invention, it is possible to reduce the cost and shorten the construction period by constructing a foundation structure in which steel beams extend sideways through tubular steel pipes that are filled with concrete and function as footings. We can provide technology that can be constructed as rationally and with high quality as possible.
Furthermore, according to this configuration, if the steel pipe portion is configured by arranging a plurality of plate-shaped steel plates in parallel, the steel pipe portion having a rectangular shape in a plan view can be easily constructed. In this way, the steel pipe portion can be configured in a relatively free shape in response to the problem of interference with other portions.

In the second characteristic configuration of the present invention, in the steel pipe portion, the joint portions are arranged at equal intervals in the circumferential direction, the notch portions are formed in the same shape, and the plurality of steel plates are configured in a common shape. It is in the point to do.

According to this configuration, for example, when the steel frame beams are arranged at equal intervals in the circumferential direction such as in a cross shape with respect to the steel pipe portion, a plurality of steel plates having a common shape are arranged side by side. The steel pipe portion can be configured in such a manner that the side edge portions are joined to each other at a joint portion that is a position through which the steel frame beam portion passes. Therefore, since it is not necessary to prepare steel plates of different shapes, it is possible to simplify the manufacturing process of the plurality of steel plates that constitute the steel pipe portion and shorten the manufacturing delivery time.

In a third characteristic configuration of the present invention, the steel pipe portion is configured by welding and joining the side edge portions of the plurality of steel plates in abutting state at the joining portion,
In the joint portion, a backing member is provided on the inner surface side of the side edge portion of the steel plate on one side and the inner surface side of the side edge portion of the steel plate on the other side contacts in the butted state.

According to this configuration, when the side edge portions of a plurality of steel plates arranged in parallel in the circumferential direction are butt-welded and joined, the backing material is fixed to the inner surface side of the butt portion, so that welding defects are prevented. Welding work can be appropriately performed from the outer surface side while suppressing the generation. Furthermore, in the work of butting the side edges of a plurality of steel plates, a backing material is provided in advance on the inner surface side of the side edge of one steel plate, so that the outer surface of the backing material and the steel plate to which it is fixed In this mode, the edge of the side edge of the steel sheet on the other side is aligned with the corner formed by the edge of the side edge of the steel sheet, so that the steel sheets can be properly positioned.

Longitudinal cross-sectional view of the foundation structure in the first embodiment The top view of the foundation structure in 1st Embodiment FIG. 2 is a perspective view of a steel plate forming the steel pipe portion of the foundation structure in the first embodiment; The figure explaining the insertion state of the steel-frame beam part with respect to the side edge part of a steel plate. A diagram for explaining the joint state of the side edges of the steel plates. The top view of the foundation structure in 2nd Embodiment The perspective view of the steel plate which comprises the steel pipe part of the foundation structure in 2nd Embodiment. Plan view of the foundation structure in the third embodiment The perspective view of the steel plate which comprises the steel pipe part of the foundation structure in 3rd Embodiment.

[First embodiment]
A first embodiment of a method for constructing a foundation structure according to the present invention will be described with reference to FIGS. 1 to 5. FIG.
As shown in FIGS. 1 and 2, the foundation structure of this embodiment is formed in a tubular shape surrounding the pile 3 buried in the ground 1 and the pile head 3a of the pile 3, and the inside is filled with concrete 18. It is composed of a steel pipe portion 10 and a steel beam portion 15 to which a column portion 16 erected above the pile head portion 3a is joined and extends laterally through the steel pipe portion 10. - 特許庁

The steel pipe portion 10, the column portion 16, and the steel frame beam portion 15 are integrally assembled as the pile cap unit 50 in advance and carried to the construction site. The pile cap unit 50 assembled in advance in this way is installed on the upper surface of the dirt floor 2 built on the ground 1 in a state where the steel pipe portion 10 surrounds the pile head portion 3a, and the lower end portion of the steel pipe portion 10 The standing posture is adjusted by height-adjustable adjusting bolt portions 14 provided at a plurality of locations on the outer periphery. After closing the gap formed at the lower end of the steel pipe portion 10 with mortar 13 or the like, concrete 18 is placed inside the steel pipe portion 10 to form a part of the foundation structure.

At a timing such as before the concrete 18 is placed inside the steel pipe portion 10, another beam member 5 attaches a splice plate and a high-strength bolt to the tip portion of the steel frame beam portion 15 that constitutes the pile cap unit 50. They are connected via the joints 6 used. Another column member is also connected to the upper end portion of the column portion 16 .

When constructing such a foundation structure, it is possible to backfill with improved soil or the like and construct a floor slab on the top surface. In addition, by using strongly alkaline improved soil as the improved soil for backfilling, it is possible to suitably prevent oxidation (rusting) of the steel material buried in the improved soil and its progress.
Specifically, referring to FIG. 1, when backfilling with improved soil to the vicinity of the top end of the steel frame beam portion 15 and the beam member 5, at least the steel material such as the steel pipe portion 10, the steel frame beam portion 15, and the beam member 5 By backfilling the surroundings with strongly alkaline improved soil, it is possible to take anti-corrosion measures for these steel materials. By implementing anti-rust measures by backfilling such improved soil, construction of underground pit slabs and retaining walls for water shielding, construction of waterproof coating on the surface of constituent materials, which was necessary in the past, is now possible. can omit or simplify the formwork for placing the floor slab on the upper surface.

In this embodiment, as shown in FIGS. 1 and 2, the steel pipe portion 10 is configured by joining side edge portions of a plurality of steel plates 10A arranged in parallel at a joint portion J. As shown in FIG. 3, the steel plate 10A is configured as an L-shaped member in a plan view, which is formed by bending a flat steel plate at a central portion at a substantially right angle. The steel pipe portion 10 is configured in a tubular shape having a substantially square cross-sectional shape by arranging four steel plates 10A bent in an L-shape side by side in the circumferential direction and joining the respective side edge portions. ing.

As shown in FIGS. 1 and 4(a) and 4(b), the steel frame beam 15 is made of H-shaped steel comprising upper and lower flanges 15a and 15b extending substantially horizontally and a web 15c extending substantially vertically. ing. As shown in FIG. 1, the steel beam portion 15 is arranged at a height where the upper end portion is flush with the upper end portion of the steel pipe portion 10, and as shown in FIG. 10 extending in four directions of up, down, left, and right, and arranged in a substantially cross shape. As shown in FIGS. 1 and 2, the column 16 is made of H-shaped steel, and extends upward with respect to the intersection of the steel beams 15 located in the center of the steel pipe 10 . Joined by welding.

As shown in FIGS. 2 and 3 , in the steel pipe portion 10 , the position of the joint J that joins the side edge portions 10s of the plurality of steel plates 10A is a penetration point of the steel frame beam portion 15 . A notch portion K into which the steel frame beam portion 15 is inserted from the side is formed in the side edge portion 10s of each of the plurality of steel plates 10A.

The notch K is a pair of upper and lower notches K1 and K2 into which substantially half the widths of the upper and lower flanges 15a and 15b of the steel frame beam portion 15 are inserted from the side at the side edge portion 10s of the steel plate 10A. The provided steel frame is formed to have a notch K3 with which the web 15c of the rib 15 abuts. Specifically, the upper notch K1 is formed as a stepped notch because it is provided at the upper end of the steel plate 10A, and the lower notch K2 is formed as a groove-like notch. It is

A cutout portion K3 located between the pair of cutout portions K1 and K2 forms an upper side edge portion 10s1 of the steel plate 10A. The upper side edge portion 10s1 has a shape that protrudes sideways while coming into contact with the web 15c of the steel frame beam portion 15 that has been inserted. On the other hand, the lower side edge portion 10s2 located on the lower side of the lower notch portion K2 is in contact with the lower side edge portion 10s2 of the side edge portion 10s of the steel plate 10A adjacent to the steel beam portion 15 therebetween. It has a shape that protrudes to the side. That is, the position of the upper side edge portion 10s1 is retreated inward by approximately 1/2 of the thickness of the web 15c of the steel frame beam portion 15 from the position of the lower side edge portion 10s2.

By inserting the steel frame beam portion 15 into the notch portion K formed in the side edge portion 10s of the steel plate 10A in this way, there is almost a gap between the steel plate 10A and the notch portion K and the steel frame beam portion 15. is no longer formed. Then, the notch portion K and the upper side edge portion 10s1 of the steel plate 10A are welded to the flanges 15a and 15b and the web 15c of the steel beam portion 15 inserted into the notch portion K, and the lower side edge portion The portion 10s2 is butt-welded to the lower side edge portion 10s2 of the side edge portion 10s of the steel plate 10A adjacent to the steel beam portion 15, thereby substantially completely closing the gap.
As a result, the joining of separate members to seal the gap is omitted. As a result, the complication of the welding work and the increase in the amount of welding due to the joining of separate members are avoided, reducing costs and shortening the construction period. The infrastructure will be built as rationally and to the highest quality as possible.

In the basic structure of the present embodiment, the steel beams 15 are arranged in a cross shape at equal intervals in the circumferential direction with respect to the steel pipe portion 10. Therefore, in the steel pipe portion 10, the joint portions J are arranged at equal intervals in the circumferential direction. , and each of the plurality of steel plates 10A is configured in a common shape. This simplifies the manufacturing process of the plurality of steel plates 10A constituting the steel pipe portion 10 and shortens the manufacturing delivery time.

As shown in FIG. 5B, in the steel pipe portion 10, the lower side edge portions 10s2 of the steel plates 10A adjacent to each other are weld-joined at the joint portion J in a butt-to-face state. Then, in order to appropriately perform the welding operation from the outer surface side (lower side in FIG. 5B) while suppressing the occurrence of welding defects during this welding, the inner surface side of the lower edge portion 10s2 of the steel plate 10A on one side A backing material 12 is provided over the entire length of the steel plate 10A, with which the inner surface side of the lower side edge portion 10s2 of the steel plate 10A on the other side abuts in a butted state.
In addition, since such a backing material 12 is provided, as shown in FIG. The steel plates 10A can be properly positioned by aligning the end of the lower side edge 10s2 of the other steel plate 10A with the corner formed by the edge of the side edge 10s2.

[Second embodiment]
A second embodiment of a construction method for a foundation structure according to the present invention will be described with reference to FIGS. 6 and 7. FIG.
The basic structure of this embodiment differs from the basic structure of the first embodiment described above only in the configuration related to the steel pipe portion. Therefore, in the following description, configurations similar to those of the above-described first embodiment may be denoted by the same reference numerals in the drawings, and detailed description thereof may be omitted.

In the present embodiment, as shown in FIG. 6, the steel pipe portion 20 is configured by joining the side edge portions of a plurality of steel plates 20A arranged side by side in the circumferential direction at joint portions J. As shown in FIG. 7, the plate-shaped steel plate 20A is used as it is without bending. The steel pipe portion 20 is configured in a tubular shape having a substantially square cross-sectional shape by arranging four flat steel plates 20A side by side in the circumferential direction and joining the respective side edge portions.

Also in this embodiment, as in the first embodiment described above, by inserting the steel frame beam portion 15 into the notch portion K (K1, K2) formed in the side edge portion 20s of the steel plate 20A, Almost no gap is formed between the steel plate 20</b>A and the cutout portion K and the steel frame beam portion 15 . Then, the cutout portion K and the upper side edge portion 20s1 of the steel plate 20A are welded to the flanges 15a and 15b and the web 15c of the steel frame beam portion 15 inserted into the cutout portion K, and the lower side edge The portion 20s2 is butt-welded to the lower side edge portion 10s2 of the side edge portion 10s of the steel plate 20A adjacent to the steel beam portion 15, thereby substantially completely closing the gap.
As a result, the joining of separate members to seal the gap is omitted. As a result, the complication of the welding work and the increase in the amount of welding due to the joining of separate members are avoided, reducing costs and shortening the construction period. The infrastructure will be built as rationally and to the highest quality as possible.

[Third embodiment]
A second embodiment of a construction method for a foundation structure according to the present invention will be described with reference to FIGS. 8 and 9. FIG.
The basic structure of the present embodiment differs from the basic structure of the first embodiment described above only in the configuration related to the shape of the steel pipe portion and the steel plate that constitutes it. Therefore, in the following description, configurations similar to those of the above-described first embodiment may be denoted by the same reference numerals in the drawings, and detailed description thereof may be omitted.

In the present embodiment, as shown in FIG. 8, the steel pipe portion 20 is configured by joining the side edge portions of a plurality of steel plates 30A arranged side by side in the circumferential direction at joints J. As also shown in FIG. 9, is configured as a member in which a flat steel plate is curved into an arc shape with a central angle of approximately 90 degrees in plan view. The steel pipe portion 30 is configured in a tubular shape having a substantially circular cross-sectional shape by arranging four arc-shaped steel plates 30A side by side in the circumferential direction and joining the respective side edge portions.

Also in this embodiment, as in the first embodiment described above, by inserting the steel frame beam portion 15 into the notch portion K (K1, K2) formed in the side edge portion 30s of the steel plate 30A, Almost no gap is formed between the steel plate 30A and the cutout portion K and the steel frame beam portion 15 . Then, the notch portion K and the upper side edge portion 30s1 of the steel plate 30A are welded to the flanges 15a and 15b and the web 15c of the steel frame beam portion 15 inserted into the notch portion K, and the lower side edge portion The portion 30s2 is butt welded to the lower side edge portion 10s2 of the side edge portion 10s of the steel plate 30A adjacent across the steel frame beam portion 15, and the gap is substantially completely closed.
As a result, the joining of separate members to seal the gap is omitted. As a result, the complication of the welding work and the increase in the amount of welding due to the joining of separate members are avoided, reducing costs and shortening the construction period. The infrastructure will be built as rationally and to the highest quality as possible.

[Another embodiment]
Another embodiment of the present invention will be described. It should be noted that the configuration of each embodiment described below is not limited to being applied alone, and can be applied in combination with the configurations of other embodiments.

(1) In the above embodiment, in the steel pipe portions 10, 20, and 30, the joints J through which the steel beam portion 15 penetrates are arranged at equal intervals in the circumferential direction. The arrangement state and the number of the joints J may be appropriately modified according to the arrangement state and the number.
In addition, in changing the arrangement state and the number of the joints J, a plurality of steel plates having different shapes may be joined to form the steel pipe portion.

(2) In the above embodiment, at the joint J, the inner surface of the lower edge 10s2 of the steel plate 10A on one side abuts against the inner surface of the lower edge 10s2 of the steel plate 10A on the other side. Although the material 12 is provided, the backing material 12 may be modified or omitted as appropriate.

1 Ground 3 Pile 3a Pile head 10, 20, 30 Steel pipe 10A, 20A, 30A Steel plate 10s, 20s, 30s Side edge 12 Backing material 15 Steel beam 16 Column 18 Concrete J Joint K, K1, K2 Notch

Claims (3)

a pile buried in the ground;
a steel pipe portion formed in a tubular shape surrounding the pile head of the pile and filled with concrete;
A cross-shaped steel beam in plan view made of H-shaped steel having upper and lower flanges and webs, with a column portion erected above the pile head being joined and extending sideways through the steel pipe portion. A method for constructing a foundation structure comprising:
The steel pipe portion is composed of a plurality of steel plates arranged in parallel in the circumferential direction, and the plurality of side edge portions are connected to the joint portion other than the through portion at the position of the joint portion that is the through portion of the steel frame beam portion. welded together,
The steel beam is inserted from the side into both side edges of each of the plurality of steel plates to form a notch along the outer periphery of the flange and web of the steel beam,
inserting the steel beam portion into the notch portion of the steel pipe portion from the side, and welding and joining the steel beam portion inserted from the side to the steel pipe portion;
A method for constructing a basic structure in which flat steel plates are used as they are without being bent as the steel plates constituting the steel pipe portion . 2. The basic structure according to claim 1, wherein in the steel pipe portion, the joint portions are arranged at equal intervals in the circumferential direction, and the notch portions have the same shape, so that each of the plurality of steel plates has a common shape. construction method. The steel pipe portion is configured by welding and joining the side edge portions of the plurality of steel plates in abutting state at the joint portion,
3. The backing material according to claim 1 or 2, wherein in the joining portion, a backing material is provided on the inner surface side of the side edge portion of the steel plate on one side and the inner surface side of the side edge portion of the steel plate on the other side contacts in the butted state. How to build the foundation structure.

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