JP2021055410A - Foundation structure and method of constructing foundation - Google Patents

Abstract

To provide a foundation structure and a method of constructing a foundation capable of responding to an unpaved site.SOLUTION: A foundation structure (1) comprises: a bottom board (10) installed on the site; a steel member (20) that is disposed horizontally on the bottom board via height adjustment members (42) and has a lower face (21a) disposed above the top face of the bottom board; and a spacer member (30) that has an inclined plane (31a) crossing the outside end part of the lower face (21a) of the steel member and is at least partly inserted in a gap between the bottom board and the steel member.SELECTED DRAWING: Figure 1

Description

The present invention relates to a foundation structure and a foundation construction method.

Japanese Unexamined Patent Publication No. 2001-3371 (Patent Document 1) proposes a technique of preliminarily preparing and paving the site on which a building is to be built and the surrounding site, and installing and fixing a dry foundation on the pavement surface. .. As a result, the foundation can be easily formed, and the building can be easily dismantled or relocated.

Japanese Unexamined Patent Publication No. 2001-3371

In Patent Document 1, as described above, since the surface to be installed on the foundation is the pavement surface, the leveling of the dry foundation is facilitated, so that the dry foundation can be directly placed on the pavement surface. Specifically, as shown in FIGS. 4A and 4B, when a square steel material is used as the dry foundation 102, the square steel material is passed through the angle material 103 pre-welded to the square steel material at a factory or the like. It is fixed to the pavement 101 with an anchor 104. Further, as shown in FIG. 4C, when the H-shaped steel material is used as the dry foundation 102, the lower flange portion 121 of the H-shaped steel material is directly fixed to the pavement portion 101 by the anchor 104.

However, there are cases where paving of the site is not possible due to building conditions, such as in the case of temporary buildings. In this case, the technique of Patent Document 1 cannot be applied. Therefore, there has been a demand for a technique that can cope with the case where the site cannot be paved and the surface to be installed on the foundation (unpaved site) has irregularities or slopes.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a foundation structure and a method of constructing a foundation that can be applied to an unpaved site.

The foundation structure according to an aspect of the present invention is a steel having a floor plate placed on the site and a lower surface arranged horizontally on the floor plate via a height adjusting member and arranged upward away from the upper surface of the floor plate. A spacer member having an inclined surface intersecting the outer end portion of the lower surface of the steel member and the steel member, and having at least a part inserted in the gap between the floor plate and the steel member is provided.

Preferably, the contact portion between the inclined surface of the spacer member and the steel member is welded and fixed.

It is also preferable that the contact portion between the outer lower end portion of the spacer member and the upper surface of the floor plate is welded and fixed.

Preferably, a plurality of spacer members are continuously arranged along the longitudinal direction of the steel member.

In this case, it is desirable that the spacer members are arranged so as to avoid the seams of the floor plates.

Preferably, the spacer member is made of angle steel having an L-shaped cross section.

The method of constructing the foundation according to the other aspects of the present invention includes a step of installing a floor plate on the site, a process of installing a steel member on the floor plate so as to be horizontal via a height adjusting member, and an inclined surface. A step of inserting at least a part of the spacer member having the above into a gap between the floor plate and the steel member so that the inclined surface intersects the outer end portion of the lower surface of the steel member.

According to the present invention, since the leveled steel member is supported from below by the spacer member, it is possible to cope with an unpaved site.

(A) and (B) are diagrams schematically showing a dry foundation structure according to an embodiment of the present invention. (A) to (C) are diagrams schematically showing a shape example of a spacer member used in the dry foundation structure according to the embodiment of the present invention. (A) to (D) are diagrams schematically showing a construction procedure of a dry foundation structure according to an embodiment of the present invention. (A) to (C) are diagrams showing a conventional dry foundation structure.

Embodiments of the present invention will be described in detail with reference to the drawings. The same or corresponding parts in the drawings are designated by the same reference numerals, and the description thereof will not be repeated.

<Dry foundation structure>
The dry foundation structure 1 according to the present embodiment will be described with reference to FIG. FIG. 1 (A) is a cross-sectional view of the dry foundation structure 1 cut in the vertical direction, and FIG. 1 (B) shows the main part of the dry foundation structure 1 from the side (from the IB direction of FIG. 1 (A)). ) It is a view. The arrow A1 shown in FIG. 1 (A) indicates the width direction (horizontal direction) of the foundation, and the arrow A2 shown in FIG. 1 (B) indicates the longitudinal direction of the foundation.

The dry foundation structure 1 is installed on the site of the building. Specifically, the dry foundation structure 1 includes a floor plate 10 placed on the site, an H-shaped steel member 20 arranged on the floor plate 10 via a height adjusting member 42, and the floor plate 10 and steel. A spacer member 30 having at least a part inserted in the gap between the member 20 is provided.

The floor plate 10 is a metal plate, and is made of an iron plate having a predetermined thickness. The floor plate 10 has a rectangular shape in a plan view and is arranged on the site of the building. When the site of the building is unpaved, there are cases where a step is generated between the floor plates 10 adjacent to each other, or the floor plates 10 themselves are slightly tilted.

The steel member 20 is an H-shaped steel and has a flange portions 21 and 22 and a web portion 23 extending vertically between the flange portions 21 and 22. The steel member 20 is arranged horizontally by height adjusting members 42 provided on both sides of the lower flange portion 21 in the width direction. That is, the steel member 20 is leveled by finely adjusting the height adjusting members 42 provided on both sides of the flange portion 21 in the width direction. As a result, it is possible to absorb the influence of the step between the floor plates 10 and the inclination of the floor plate 10 itself. In the present embodiment, both sides in the width direction centered on the web portion 23 are also referred to as outer sides.

The height adjusting member 42 is, for example, a known height adjusting bolt. In this case, the nut 41 screwed into the height adjusting bolt is welded in advance to the upper surface or the lower surface 21a of the flange portion 21.

The spacer member 30 has an inclined surface 31a that intersects the lower surface of the steel member 20, that is, the outer end of the lower surface 21a of the flange portion 21. In the present embodiment, the spacer member 30 is made of angle steel. Angle steel is an angle material having an L-shaped cross section. In this case, the spacer member 30 includes a first plate portion 31 forming the inclined surface 31a and a second plate portion 32 orthogonal to the first plate portion 31. In this case, the lower surface 21a of the flange portion 21 and the inclined surface 31a of the spacer member 30 intersect at an angle of approximately 45 degrees. The second plate portion 32 constitutes the outer surface 32a of the spacer member 30.

The spacer member 30 is an elongated member extending along the longitudinal direction of the steel member 20. A spacer member 30 cut to a predetermined length may be used in order to cope with the non-landing of the floor plate 10. The length dimension L2 of the spacer member 30 is, for example, about 1000 mm.

As shown in FIG. 1B, it is desirable that a plurality of spacer members 30 are continuously arranged along the longitudinal direction of the steel member 20. In this case, since the steel member 20 can be supported linearly along the longitudinal direction, the structural design of the floor plate 10 can be performed using the same calculation method as the base portion of the RC cloth foundation. Therefore, the spacer member 30 is advantageous in designing the building as compared with the form in which the spacer member 30 is arranged in a piece shape along the longitudinal direction of the steel member 20.

In the present embodiment, a plurality of (for example, three) spacer members 30 are arranged within the length range L1 (for example, about 3000 mm) of one floor plate 10. The distance between the spacer members 30 adjacent to each other in the longitudinal direction is, for example, 50 mm or less, and preferably 30 mm or less. As shown, it is desirable that the spacer member 30 is arranged so as to avoid the seam of the floor plate 10. As a result, it is possible to make it less susceptible to the influence when the end portion of the floor plate 10 is warped.

The contact portion between the inclined surface 31a of the spacer member 30 and the outer end portion of the flange portion 21 is welded and fixed. As a result, the load can be transmitted from the steel member 20 to the spacer member 30. FIG. 1A shows a welded portion 51 in which the inclined surface 31a of the spacer member 30 and the outer end portion of the flange portion 21 are welded together. As shown in FIG. 1B, the welded portion 51 may not be continuous along the longitudinal direction of the steel member 20 and may be intermittent. At least one weld 51 is provided along the longitudinal direction for one spacer member 30. It is desirable that the welded portions 51 are provided at regular intervals (for example, at a pitch of 500 mm) along the longitudinal direction of the continuous spacer members 30. The length of the welded portion 51 (the length along the longitudinal direction of the spacer member 30) may be, for example, about 150 mm.

Further, the contact portion between the outer lower end portion of the spacer member 30 (the lower end portion of the second plate portion 32) and the upper surface of the floor plate 10 is welded and fixed. As a result, when the load applied to the steel member 20 is stress-transmitted to the spacer member 30, it is possible to prevent the spacer member 30 from shifting (disengaging) to the outside. FIG. 1A shows a welded portion 52 in which the outer lower end portion of the spacer member 30 and the floor plate 10 are welded together. The weld 52 may also be intermittent, like the weld 51.

As described above, the spacer member 30 has an inclined surface 31a that abuts on the outer corner (the intersection of the lower surface 21a and the outer end surface) of the flange portion 21, so that the height of the flange portion 21 with respect to the floor plate 10 is high. It is possible to respond to changes in the flange. That is, even if the distance (gap) between the floor plate 10 and the lower surface 21a of the flange portion 21 is not constant, at least a part of the spacer member 30 can be inserted under the flange portion 21.

The spacer member 30 will be described with reference to FIG. 2 (A). The height dimension (vertical height of the inclined surface 31a) H of the spacer member 30 is preferably 40 mm or more and 70 mm or less, and more preferably 50 mm or more. In the present embodiment, the vertical length dimension l of the plate portions 31 and 32 of the spacer member 30 is, for example, 75 mm. In this case, the height dimension H is about 53 mm. The thickness dimension t2 of the flange portion 21 of the steel member 20 is, for example, 12 mm.

It is applicable when the height dimension H of the spacer member 30 is about 53 mm and the gap between the floor plate 10 and the flange portion 21 (corresponding to ha and hb shown in FIG. 3C) is 50 mm or less. However, when the gap between the floor plate 10 and the flange portion 21 is 15 mm or more and 45 mm or less, the spacer member 30 can appropriately support the steel member 20 from below.

It is desirable that the thickness dimension t3 of each plate portion 31 and 32 of the spacer member 30 is ½ or more of the thickness dimension t2 of the flange portion 21 in consideration of strength. Specifically, the thickness dimension t3 is preferably 6 mm or more, and more preferably 8 mm or more. The thickness dimension t1 of the floor plate 10 is, for example, 20 mm or more.

The spacer member 30 may have at least an inclined surface 31a that intersects the outer end of the lower surface 21a of the steel member 20. That is, the shape of the spacer member 30 is not limited to the shape shown in FIG. 2 (A). Specifically, as shown in FIG. 2B, the outer surface 32b of the spacer member 30A does not have to be an inclined surface. Further, as shown in FIG. 2C, the spacer member 30B may be formed of a solid member. Further, the spacer member is not limited to a triangular shape, but may have a trapezoidal shape or the like.

Further, the inclination angle of the inclined surface 31a may be set so that the angle intersecting the lower surface 21a of the steel member 20 is in the range of 30 degrees or more and 60 degrees or less. It is desirable that the inclined surface 31a is smooth without unevenness.

<Construction method of dry foundation>
The construction method of the dry foundation according to the present embodiment will be described with reference to FIG. 3 (A) to 3 (D) are views schematically showing the construction procedure of the dry foundation structure 1.

As shown in FIG. 3A, first, the floor plate 10 is placed on the site. That is, a plurality of floor boards 10 are arranged on the site of the building.

After that, as shown in FIG. 3B, the steel member 20 with the height adjusting member 42 is installed along a predetermined line such as the outer wall line of the building. At this time, the height adjusting members 42 provided on both sides (left and right on the paper surface) of the lower flange portion 21 are individually operated to level the steel member 20. That is, the slight inclination (height deviation) of the steel member 20 is adjusted so that the flange portion 21 (22) of the steel member 20 is horizontal.

After leveling the steel member 20, as shown in FIG. 3C, a pair of chevron spacer members 30 are inserted into the space below the flange portion 21 from both outer sides. The spacer member 30 is inserted by sliding on the floor plate 10 from the outside to the inside until the inclined surface 31a abuts on the outer corner of the flange portion 21 (the outer edge of the lower surface 21a).

As described above, since the spacer member 30 has a smooth inclined surface 31a, it is not necessary to prepare spacers individually according to the gaps (heights) ha and hb between the floor plate 10 and the flange portion 21. That is, it is possible to correspond to the gaps ha and hb between the floor plate 10 and the flange portion 21 by adjusting the insertion amount of the spacer member 30 having the same configuration and size and inserting the spacer member 30 under the flange portion 21. it can.

When the installation of the spacer member 30 is completed, the spacer member 30 is finally welded and fixed to the steel member 20 and the floor plate 10. Specifically, with reference to FIG. 3D, a triangular gap S1 (contact portion) between the inclined surface 31a of the spacer member 30 and the outer end surface 21b of the flange portion 21 is welded and fixed, and the spacer is formed. A triangular gap S2 (contact portion) between the outer lower end surface (lower end surface of the second plate portion 32) 32b of the member 30 and the upper surface of the floor plate 10 is welded and fixed. As a result, the dry foundation structure 1 is completed.

In the present embodiment, since the lower side of the gaps S1 and S2 is closed and the gap S1 and S2 are opened to the upper side (obliquely upper side), the welding work to the gaps S1 and S2 can be performed downward. That is, since the welded portions 51 and 52 shown in FIG. 1 can be fillet welded, the workability is good. Further, this makes it possible to ensure the quality of the welded portions 51 and 52.

As described above, according to the present embodiment, since the leveled steel member 20 is supported from below by the spacer member 30, a cement material such as grout is used even on an unpaved site. The foundation of the building can be built by the dry method without using. As a result, the building can be easily dismantled, so that the dry foundation structure 1 according to the present embodiment can be effectively used as the foundation of the temporary building.

Further, since commercially available angle steel can be used as the spacer member 30, a simple and inexpensive dry foundation can be used.

In the present embodiment, the height adjusting member 42 is composed of height adjusting bolts provided on the flange portion 21 of the H-shaped steel, but the height adjusting member 42 is not limited. In that case, the steel member may be other than H-shaped steel. For example, it may be a square steel as shown in FIGS. 4A and 4B, or a channel steel.

Further, although the foundation structure according to the present embodiment has been described as being a dry foundation, it may include a wet portion. For example, the grout material may be (partially) filled below the flange portion 21.

It should be considered that the embodiments disclosed this time are exemplary in all respects and not restrictive. The scope of the present invention is shown by the scope of claims rather than the above description, and it is intended to include all modifications within the meaning and scope equivalent to the scope of claims.

1 Dry foundation structure, 10 floor plate, 20 steel member, 21,22,121 flange part, 21a lower surface, 23 web part, 30,30A, 30B spacer member, 31a inclined surface, 42 height adjustment member, S1, S2 ha, hb gap.

Claims (7)

The floor board placed on the site and
A steel member having a lower surface that is horizontally arranged on the floor plate via a height adjusting member and is arranged above the upper surface of the floor plate.
A basic structure having an inclined surface intersecting an outer end portion of a lower surface of the steel member, and comprising a spacer member having at least a part inserted in a gap between the floor plate and the steel member. The basic structure according to claim 1, wherein the contact portion between the inclined surface of the spacer member and the steel member is welded and fixed. The basic structure according to claim 1 or 2, wherein the contact portion between the outer lower end portion of the spacer member and the upper surface of the floor plate is welded and fixed. The basic structure according to any one of claims 1 to 3, wherein a plurality of the spacer members are continuously arranged along the longitudinal direction of the steel member. The basic structure according to claim 4, wherein the spacer member is arranged so as to avoid the seam of the floor plate. The basic structure according to any one of claims 1 to 5, wherein the spacer member is made of angle steel having an L-shaped cross section. The process of installing a floor board on the site and
A process of installing a steel member on the floor plate so as to be horizontal via a height adjusting member, and
A step of inserting at least a part of a spacer member having an inclined surface into a gap between the floor plate and the steel member so that the inclined surface intersects the outer end portion of the lower surface of the steel member. How to prepare the foundation.

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