JP7207516B2 - Building foundation structure and its construction method - Google Patents

Description

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

BACKGROUND ART There is known a foundation structure of a building in which a steel foundation is placed on a concrete foundation for weight reduction or the like. For example, in the foundation structure of a building described in Patent Document 1, an H-section steel (7) is arranged on a flat plate-like foundation portion (6) provided in the ground, and the H-section steel (7) is attached to the H-section steel (7) by anchor bolts (8). is connected to the planar base portion (6). One opening formed between one flange and the other flange of the H-section steel (7) opens to the outside of the steel foundation. A blindfold panel (12) for closing this opening is attached to the H-shaped steel (7) installed on the flat base portion (6). Furthermore, a finishing layer (124) is formed on the surface of the blindfold panel (12) to enhance the design of the basic structure.

JP-A-2001-303583

It is desirable to be able to shorten the time required for constructing the foundation structure in order to shorten the construction period of the building. For example, according to the basic structure of Patent Document 1, it takes time to attach the blindfold panel (12) to the H-shaped steel (7), so it is considered that there is room for improvement in terms of shortening the construction time.

(1) A steel foundation including a perimeter foundation composed of a plurality of perimeter steel materials according to the present invention, wherein the plurality of perimeter steel materials include at least one finishing steel material, and the finishing steel material is perpendicular to the longitudinal direction of the finishing steel material. an outer surface extending between an upper end and a lower end of said finished steel at horizontal ends thereof, wherein said perimeter foundation is configured such that said outer surface is positioned on said perimeter of said perimeter foundation; The outer surface is provided with a wire mesh bonded to the outer surface, an inner layer entwined with the wire mesh, and an outer layer provided on the inner layer.

(1A) The foundation structure of the reference building includes a steel foundation including a perimeter foundation composed of a plurality of perimeter steel materials, the plurality of perimeter steel materials including at least one finishing steel material, and the finishing steel material being the finishing steel material. an outer surface that extends between the upper and lower ends of the finished steel at horizontal ends perpendicular to the longitudinal direction, the perimeter foundation being configured such that the outer surface is located on the perimeter of the perimeter foundation.
According to the foundation structure, when it is necessary to form a finishing layer on at least a part of the steel foundation, the outer periphery of the steel foundation is positioned so that the outer surface of the finishing steel material is positioned where the finishing layer is planned to be formed. can be assembled. Since the outer surface is positioned on the outer periphery of the perimeter foundation, unlike the conventional foundation structure, a finishing layer can be formed on the outer surface without attaching a panel for filling the concave portion of the steel material to the finishing steel material. Therefore, the construction time of the foundation structure can be shortened.

(2) In a preferred example, in the building foundation structure according to (1), the finishing steel is channel steel, and the outer surface is a web surface of the channel steel.
The productivity of steel foundations is improved because existing channel steel is used as finishing steel.

(3) In a preferred example, in the building foundation structure according to (1) or (2), all of the plurality of peripheral steel materials are the finishing steel materials.
Therefore, the construction time of the foundation structure can be further shortened.

(4) In a preferred example, the building foundation structure according to any one of (1) to (3), wherein the steel foundation further comprises at least one section steel material arranged within the perimeter foundation, The peripheral steel material and the section steel material are shaped steels, and the type of shaped steel of the compartmental steel material is different from the type of shaped steel of the outer peripheral steel material.
Therefore, a partition foundation suitable for the structure of a building can be constructed.

(5) In a preferred example, in the building foundation structure described in (4), the section steel is H-section steel.
Therefore, the cross-sectional efficiency of the steel foundation is increased.

(6) In a preferred example, in the building foundation structure according to any one of (1) to (5), the outer peripheral steel material has a housing structure for housing anchor bolts.
When the foundation structure is formed, the steel materials necessary for manufacturing the steel foundation, including the plurality of perimeter steel materials, are transported around the excavated trench formed in the ground. In this case, with the foundation structure described above, the perimeter foundation can be transported while the anchor bolts are housed in the housing structure of the perimeter steel material. Therefore, the outer peripheral steel material and the anchor bolts can be efficiently conveyed.

(7) In a preferred example, in the building foundation structure according to any one of (1) to (6), the anchor bolts attached to the steel foundation and the height of the steel foundation relative to the ground level are It further comprises an adjusting component that is adjustably attached to the anchor bolt.
Therefore, the height of the steel foundation relative to the ground level can be easily adjusted.

(8) In a preferred example, in the building foundation structure described in (7), the material forming the adjustment parts is synthetic resin or concrete.
Since the adjustment parts do not rust, the durability of the concrete foundation formed below the steel foundation for supporting the steel foundation is enhanced.

(9) A method for constructing a foundation structure of a building according to the present invention comprises a placement step of placing a steel foundation including a perimeter foundation composed of a plurality of perimeter steel materials on an auxiliary layer via anchor bolts; A method of constructing a foundation structure for a building, including a forming step of forming a concrete foundation for supporting the steel foundation between the steel foundation and a finishing step of forming a finishing layer on the steel foundation. wherein, in the arranging step, at least one finished steel material including an outer surface extending between an upper end and a lower end at a horizontal end perpendicular to the longitudinal direction is used, and the outer surface is positioned on the outer circumference of the perimeter foundation. In the finishing step, a wire mesh is joined to the outer surface located on the outer periphery of the outer peripheral foundation, an inner layer is formed so as to be entwined with the wire mesh, and the hardened inner layer and the concrete An outer layer is formed to cover the outer surface of the base of the product.

(9A) A construction method for the foundation structure of a reference building includes a placement step of arranging a steel foundation including a perimeter foundation composed of a plurality of perimeter steel materials on an auxiliary layer via anchor bolts; and a forming step of forming a concrete foundation that supports the steel foundation between the steel foundation and the foundation, wherein in the placement step, the horizontal direction perpendicular to the longitudinal direction At least one finished steel stock is used that includes an outer surface extending at its ends between upper and lower ends, and the steel foundation is constructed such that the outer surface is located on the perimeter of the perimeter foundation.
According to the above construction method, the same effects as those obtained by the above (1A) foundation structure can be obtained.

(10) In a preferred example, in the method for constructing a building foundation structure described in (9), this is a step performed between the arranging step and the forming step, wherein adjusting parts attached to the anchor bolts are removed. Further comprising an adjusting step of adjusting the height of said steel foundation relative to the ground level by rotating.
According to the construction method described above, the same effects as those obtained by the foundation structure in (7) above can be obtained.

According to the foundation structure of the building and the construction method thereof according to the present invention, the construction time of the foundation structure can be shortened.

Sectional drawing of the basic structure of the building of embodiment. A plan view of the foundation structure. The perspective view of the 1st connection part of a steel foundation. The perspective view of the 2nd connection part of a steel foundation. The perspective view of the 3rd connection part of a steel foundation. The perspective view of the 4th connection part of a steel foundation. Front view of the anchor set. The front view which shows the accommodation state of an anchor set. The front view which shows the protruded state of an anchor set. The figure regarding the 1st process and 2nd process of the construction method of a foundation structure. The figure regarding the 5th process of the construction method of a foundation structure.

(embodiment)
A foundation structure 10 on which a building body 100 is installed will be described with reference to FIG. The foundation structure 10 and the building body 100 constitute a building 200 . The foundation structure 10 is installed on the ground G so as to straddle the ground level GL in the vertical direction. A pile 11 is driven into the ground G when ground reinforcement is required. An example of pile 11 is a steel pipe.

An example of a building body 100 is an individual house or apartment complex. The building body 100 includes a skeleton 110 and an outer wall 120 . The main elements that make up the foundation structure 10 are a concrete foundation 20 , a steel foundation 30 and a plurality of anchor sets 70 . Concrete foundation 20 and steel foundation 30 are connected by a plurality of anchor sets 70 . The skeleton 110 is joined to the steel foundation 30 by bolts 130 . The outer wall 120 covers the skeleton 110 .

A concrete foundation 20 is formed on the sublayer 12 . The upper part 21 of the concrete foundation 20 is located on the ground. Auxiliary layers 12 are optionally formed to aid in the fabrication of the concrete foundation 20 . Examples of the structure of the auxiliary layer 12 are a single-layer structure consisting of only a sacrificial concrete layer and a two-layer structure consisting of a sacrificial concrete layer and a crushed stone layer. Pile 11 supports concrete foundation 20 via auxiliary layer 12 . A steel foundation 30 is installed on the upper part 21 of the concrete foundation 20 . A building body 100 is installed on a steel foundation 30 . The material constituting the concrete foundation 20 and the sacrificial concrete layer is strongly alkaline concrete.

A finishing layer 80 is formed on the outer periphery of the steel foundation 30 . The finishing layer 80 constitutes the appearance of the building body 100 together with the outer wall 120 of the building body 100 . The material that constitutes the finishing layer 80 can be selected arbitrarily. One example is mortar. In the example shown in FIG. 1, the finishing layer 80 is composed of an inner layer 81 and an outer layer 82 . The inner layer 81 is formed on the base surface 30C of the steel foundation 30 so as to cover the wire mesh 90 joined to the steel foundation 30 . The outer layer 82 is formed to cover the outer surface 21A of the upper portion 21 of the concrete foundation 20 and the inner layer 81 .

As shown in FIG. 2, the steel foundation 30 is composed of a plurality of steel members 40,50. The steel foundation 30 is divided into a perimeter foundation 30A and a partition foundation 30B. 30 A of perimeter foundations comprise the outer shell of the steel foundations 30. As shown in FIG. The partition foundation 30B partitions the space inside the perimeter foundation 30A. The plurality of steel members 40 , 50 include a plurality of perimeter steel members 40 and a plurality of section steel members 50 . A plurality of perimeter steel materials 40 constitute the perimeter foundation 30A. A plurality of partition steel materials 50 constitute a partition foundation 30B. The shape of the perimeter foundation 30A and the installation location of the partition foundation 30B are determined according to the structure of the building body 100. FIG.

The individual perimeter steels 40 and section steels 50 are joined to the concrete foundation 20 by a plurality of anchor sets 70 . In one example, a plurality of anchor sets 70 are spaced apart to form longitudinal rows of perimeter steel 40 and section steel 50 . In the example shown in FIG. 2, there are two rows of anchor sets 70 provided on each perimeter steel 40 and section steel 50 .

In a preferred example, the plurality of perimeter steels 40 include at least one finishing steel 40A. The finishing steel material 40A is a steel material having a structure in which the finishing layer 80 can be formed without attaching a panel serving as a base of the finishing layer 80 to the outer peripheral steel material 40 . Finished steel material 40A includes base surface 30C (see FIG. 1). The base surface 30C extends between the upper end and the lower end of the finished steel material 40A at the horizontal ends perpendicular to the longitudinal direction of the finished steel material 40A. An example of the type of finished steel 40A is channel steel and prismatic steel pipe. Channels are classified as regular channels, light-duty channels and lip channels.

In the example shown in FIG. 2, all of the plurality of peripheral steel materials 40 are finishing steel materials 40A. The type of finish steel 40A is light channel steel. When steel materials other than the finishing steel material 40A are included in the plurality of outer peripheral steel materials 40, the type of the steel material can be arbitrarily selected. Examples of steel materials other than the finished steel material 40A are H-section steel and I-section steel.

As shown in FIG. 1 , the finished steel material 40A, light channel steel, is composed of a first flange 41 , a second flange 42 and a web 43 . A recess 44 surrounded by an inner surface 41A of the first flange 41, an inner surface 42A of the second flange 42, and an inner surface 43A, which is one of the web surfaces of the web 43, is formed in the finished steel material 40A. The outer surface 41B of the first flange 41 is installed on the upper portion 21 of the concrete foundation 20 . The outer surface 42B of the second flange 42 supports the building body 100. As shown in FIG. The outer surface 43B, which is the other web surface of the web 43, is located on the outer circumference of the outer circumference base 30A. The outer surface 43B of the web 43 is the base surface 30C. The outer surface 43B of the web 43 is located between the outer surface 41B of the first flange 41 that defines the upper end of the finished steel material 40A and the outer surface 42B of the second flange 42 that defines the lower end of the finished steel material 40A at the widthwise end of the finished steel material 40A. spread.

The type of partition steel material 50 can be selected arbitrarily. Examples of types of section steel 50 are H-beams, channel steels, I-beams, and prism steel pipes. In one example, the type of section steel 50 is different from the type of perimeter steel 40 . In the example shown in FIG. 2, all section steels 50 are H-beams. As shown in FIG. 1 , the H-section steel, which is the section steel material 50 , is composed of a first flange 51 , a second flange 52 and a web 53 . A recess 54 surrounded by an inner surface 51 A of the first flange 51 , an inner surface 52 A of the second flange 52 , and a web surface 53 A of the web 53 is formed in the partition steel material 50 . The outer surface 51B of the first flange 51 is installed on the upper portion 21 of the concrete foundation 20 . The outer surface 52B of the second flange 52 supports the building body 100. As shown in FIG.

As shown in FIG. 2 , the steel base 30 is formed with a first connecting portion 31 , a second connecting portion 32 , a third connecting portion 33 and a fourth connecting portion 34 . The first connecting portion 31 is a portion where two outer peripheral steel members 40 arranged in the longitudinal direction are connected to each other. The second connecting portion 32 is a portion where two outer peripheral steel members 40 arranged to form a corner of the outer peripheral foundation 30A are joined to each other. The third connecting portion 33 is a portion where the outer peripheral steel material 40 and the partition steel material 50 arranged so as to be orthogonal to each other are connected to each other. The fourth connecting portion 34 is a portion where the outer peripheral steel material 40 and the partition steel material 50 arranged in the longitudinal direction are connected to each other. A connecting plate 60 (see FIGS. 3 to 6) for connecting the steel materials to each other is joined to the portions of the outer peripheral steel material 40 and the partition steel material 50 that form the respective connecting portions 31 to 34 . An example of a joining means is welding.

FIG. 3 shows longitudinal ends of two outer peripheral steel members 40 that constitute the first connecting portion 31 . A first plate 61 , which is an example of a connecting plate 60 , is joined to the longitudinal ends of the outer peripheral steel material 40 . The first plate 61 is joined to the outer peripheral steel material 40 so as to close the opening of the recess 44 that opens in the longitudinal direction of the outer peripheral steel material 40 . Specifically, the inner surface 61 A of the first plate 61 is joined to the end surface of the first flange 41 , the end surface of the second flange 42 and the end surface of the web 43 . The first plate 61 is formed with a plurality of holes 61C opening to the inner surface 61A and the outer surface 61B of the first plate 61 .

At the first connecting portion 31, the outer surface 61B of the first plate 61 of one of the outer peripheral steel members 40 and the outer surface 61B of the first plate 61 of the other outer peripheral steel member 40 are butted against each other. A nut 67 is coupled to a bolt 66 inserted into each hole 61</b>C of each first plate 61 . The two outer peripheral steel members 40 are connected by a bolt 66 and a nut 67 that are connected. The bolt 66 and nut 67 are placed in the recess 44 of the outer steel material 40 . Therefore, various operations including the formation of the finishing layer 80 are not hindered by the bolts 66 and nuts 67 .

FIG. 4 shows longitudinal ends of two outer peripheral steel members 40 that constitute the second connecting portion 32 . A first plate 61 is joined to one end of the outer peripheral steel material 40 in the longitudinal direction in the same manner as the outer peripheral steel material 40 that constitutes the first connecting portion 31 . The first plate 61 is also joined to the longitudinal end portion of the other outer peripheral steel material 40 . However, the holes 61C are not formed in the first plate 61. As shown in FIG. A second plate 62 , which is an example of a connecting plate 60 , is further joined to the longitudinal end of the other outer peripheral steel material 40 .

The second plate 62 is joined to the outer peripheral steel material 40 so as to close the opening of the recess 44 that opens in the lateral direction of the outer peripheral steel material 40 . Specifically, the inner surface 62A of the second plate 62 is joined to the edge of the inner surface 41A of the first flange 41, the edge of the inner surface 42A of the second flange 42, and the edge of the inner surface 61A of the first plate 61, respectively. . The second plate 62 is formed with a plurality of holes 62C opening to the inner surface 62A and the outer surface 62B of the second plate 62 .

At the second connecting portion 32, the outer surface 61B of the first plate 61 of one of the outer peripheral steel members 40 and the outer surface 62B of the second plate 62 of the other outer peripheral steel member 40 are butted against each other. Nuts 67 are coupled to bolts 66 inserted through holes 61C and 62C of plates 61 and 62, respectively. The two outer peripheral steel members 40 are connected by a bolt 66 and a nut 67 that are connected. The bolt 66 and nut 67 are placed in the recess 44 of the outer steel material 40 .

FIG. 5 shows the intermediate part of the outer peripheral steel material 40 and the longitudinal end part of the partition steel material 50 that constitute the third connecting part 33 . A third plate 63 , which is an example of the connecting plate 60 , is joined to the intermediate portion of the outer peripheral steel material 40 . The third plate 63 is joined to the outer peripheral steel material 40 so as to partition the concave portion 44 of the outer peripheral steel material 40 in the longitudinal direction. Specifically, the bottom surface of the third plate 63 is joined to the inner surface 41A of the first flange 41, the top surface of the third plate 63 is joined to the inner surface 42A of the second flange 42, and one side surface of the third plate 63 is joined to the inner surface 43A of the web 43. The third plate 63 is formed with a plurality of holes 63C opening to the first main surface 63A and the second main surface 63B of the third plate 63 .

A fourth plate 64 , which is an example of the connecting plate 60 , is joined to the longitudinal ends of the partition steel material 50 . The fourth plate 64 is joined to the partition steel material 50 so as to protrude from the end face of the partition steel material 50 in the longitudinal direction. Specifically, the first main surface 64A of the fourth plate 64 is joined to the web surface 53A of the web 53. As shown in FIG. The fourth plate 64 is formed with a plurality of holes 64C opening to the first principal surface 64A and the second principal surface 64B of the fourth plate 64 .

At the third connecting portion 33, the first main surface 63A of the third plate 63 of the outer peripheral steel material 40 and the first main surface 64A of the fourth plate 64 of the partition steel material 50 are butted against each other. Nuts 67 are coupled to bolts 66 inserted through holes 63C and 64C of plates 63 and 64, respectively. The outer peripheral steel material 40 and the partition steel material 50 are connected by the bolts 66 and nuts 67 that are connected. The bolt 66 and nut 67 are placed in the recess 44 of the outer steel material 40 .

FIG. 6 shows longitudinal ends of the outer peripheral steel material 40 and the partition steel material 50 that constitute the fourth connecting portion 34 . A first plate 61 is joined to a longitudinal end portion of the outer peripheral steel material 40 in the same manner as the outer peripheral steel material 40 that constitutes the first connecting portion 31 . A fifth plate 65 , which is an example of the connecting plate 60 , is joined to the longitudinal end of the partition steel material 50 . The fifth plate 65 is joined to the partition steel material 50 so as to close the opening of each recess 54 opening in the longitudinal direction of the partition steel material 50 . Specifically, the inner surface 65 A of the fifth plate 65 is joined to the end surface of the first flange 51 , the end surface of the second flange 52 and the end surface of the web 53 . The fifth plate 65 is formed with a plurality of holes 65C opening to the inner surface 65A and the outer surface 65B of the fifth plate 65 .

At the fourth connecting portion 34, the outer surface 61B of the first plate 61 of the outer peripheral steel material 40 and the outer surface 65B of the fifth plate 65 of the partition steel material 50 are butted against each other. Nuts 67 are coupled to bolts 66 inserted through holes 61C and 65C of plates 61 and 65, respectively. The outer peripheral steel material 40 and the partition steel material 50 are connected by the bolts 66 and nuts 67 that are connected. The bolts 66 and nuts 67 are placed in the recesses 44 of the peripheral steel 40 or the recesses 54 of the compartment steel 50, respectively.

A specific configuration of the anchor set 70 will be described with reference to FIG. Elements constituting the anchor set 70 are an anchor bolt 71 , a plurality of nuts 72 , a fixing plate 73 and an adjusting part 74 . Anchor bolts 71 connect the steel foundation 30 and the concrete foundation 20 . The anchor bolt 71 is inserted into a hole (not shown) formed in the first flange 41 of the outer peripheral steel material 40 . Anchor bolts 71 are embedded in the concrete foundation 20 after the concrete foundation 20 is formed.

The anchor bolt 71 is divided into a first portion 71A and a second portion 71B with the first flange 41 as a reference. The first portion 71A includes the first end portion 71C of the anchor bolt 71 and protrudes from the inner surface 41A of the first flange 41 toward the recess 44 side. The second portion 71B includes the second end portion 71D of the anchor bolt 71 and protrudes from the outer surface 41B of the first flange 41 toward the concrete foundation 20 side. The length of the second portion 71B is longer than the length of the first portion 71A. The fixing plate 73 increases the joint strength between the concrete foundation 20 and the anchor bolt 71 . The fixing plate 73 is attached to a portion of the second portion 71B near the second end portion 71D. Note that the relationship between the section steel material 50 and the anchor set 70 is the same as described above.

The multiple nuts 72 include a first nut 72A, a second nut 72B, a third nut 72C, and a fourth nut 72D. The first nut 72A and the second nut 72B are coupled to the anchor bolt 71 so as to sandwich the first flange 41 therebetween. Specifically, the first nut 72A is coupled to the first portion 71A of the anchor bolt 71. As shown in FIG. The first nut 72A contacts the inner surface 41A of the first flange 41 . A second nut 72B is coupled to the second portion 71B of the anchor bolt 71 . The second nut 72B contacts the outer surface 41B of the first flange 41 .

A third nut 72C and a fourth nut 72D are coupled to the anchor bolt 71 so as to sandwich the fixing plate 73 therebetween. Specifically, the third nut 72C is coupled to the first end portion 71C side of the fixing plate 73 of the second portion 71B of the anchor bolt 71 . The third nut 72</b>C contacts one main surface of the fixing plate 73 . The fourth nut 72D is coupled to the second end portion 71D side of the fixing plate 73 of the second portion 71B of the anchor bolt 71 . The fourth nut 72</b>D contacts the other main surface of the fixing plate 73 .

The adjustment component 74 adjusts the height of the steel foundation 30 with respect to the ground level GL. In one example, adjustment component 74 is a nut coupled to anchor bolt 71 . Any material can be selected for the adjustment component 74 . In a preferred example, the adjustment component 74 is made of a highly corrosion-resistant material. One example is synthetic resin or concrete. When the adjusting part 74 is covered with the concrete foundation 20 , if moisture enters between the auxiliary layer 12 and the concrete foundation 20 , the moisture may adhere to the adjusting part 74 . Since the adjusting part 74 has high corrosion resistance, it does not easily corrode even when moisture adheres to it. Therefore, the progress of neutralization of the concrete foundation 20 is suppressed, and the life of the concrete foundation 20 is extended.

The adjusting part 74 is coupled to the second end 71D of the anchor bolt 71. As shown in FIG. The shape of the adjusting part 74 is approximately a truncated cone. A top surface 74D and a bottom surface 74E of the adjustment component 74 are flat. The area of the bottom surface 74E is wider than the area of the top surface 74D. The top surface 74D vertically faces the fourth nut 72D. The bottom surface 74E is placed on the auxiliary layer 12 . A hole 74</b>A is formed in the center of the adjusting part 74 along the height direction of the adjusting part 74 . A female thread 74C that couples with the anchor bolt 71 is formed on the inner peripheral surface 74B forming the hole 74A.

FIG. 11 shows a temporary installation state in which the steel foundation 30 is installed on the auxiliary layer 12 via the anchor sets 70 and the concrete foundation 20 is not formed. In the temporarily installed state, a protruding state is formed in which most of the anchor set 70 is positioned below each steel member 40, 50 so as to support the steel foundation 30. As shown in FIG. The relationship between the anchor set 70 and the steel members 40, 50 in the protruding state is substantially the same as the relationship shown in FIG.

In the temporarily installed state, the adjustment part 74 can be rotated with respect to the anchor bolt 71 . Rotation of the adjusting part 74 with respect to the anchor bolt 71 causes the anchor bolt 71 to move vertically upward or downward depending on the direction of rotation. As the plurality of anchor bolts 71 coupled to the steel members 40 and 50 move vertically, the steel members 40 and 50 also move vertically. Therefore, the height of the steel foundation 30 with respect to the ground level GL can be adjusted according to the amount of rotation of the adjuster component 74 with respect to the anchor bolt 71 . When the steel foundation 30 is lowered to the lowest position in the height adjustment range of the steel foundation 30 (hereinafter referred to as the “lower limit state”), the fourth nut 72D contacts the top surface 74D of the adjusting part 74, and the anchor The downward movement of the bolt 71 is restricted.

The depth of the hole 74A is greater than the length of the second portion 71B of the anchor bolt 71 protruding from the fourth nut 72D. In a preferred example, the depth of the hole 74A is determined such that a space 75 is formed between the second end 71D of the anchor bolt 71 and the auxiliary layer 12 when the steel foundation 30 is in its lowest state. Therefore, the contact of the second ends 71D of the anchor bolts 71 with the auxiliary layer 12 due to the adjustment of the height of the steel foundation 30 is avoided.

The height LA of the adjusting part 74 can be arbitrarily selected. In one example, the height LA is determined based on the relationship between the joint strength of the anchor bolts 71 and the concrete foundation 20 and the cover thickness of the anchor bolts 71 . The height LA is the distance between the top surface 74D and the bottom surface 74E of the adjusting component 74. As shown in FIG. An example of the maximum value of height LA is 100 mm. When the height LA is 100 mm or less, the joint strength between the concrete foundation 20 and the anchor bolts 71 increases. Examples of minimum values for height LA are 40 mm and 60 mm. When the height LA is 40 mm or more, a large covering thickness of the anchor bolt 71 can be secured. When the height LA is 60 mm or more, a larger covering thickness of the anchor bolt 71 can be ensured. Examples of possible ranges for the height LA are 40 mm to 100 mm and 60 mm to 100 mm.

As shown in FIG. 8, the perimeter steel 40 further comprises a receiving structure 46 for receiving the anchor set 70 . Compartment steel 50 also has a similar containment structure. Here, the details of the housing structure 46 will be illustrated using the outer peripheral steel material 40 as an example. Receiving structure 46 is constituted by recess 44 , hole 41C in first flange 41 and hole 42C in second flange 42 . The holes 41C are opened on the inner surface 41A and the outer surface 41B of the first flange 41, respectively. The holes 42C are opened on the inner surface 42A and the outer surface 42B of the second flange 42, respectively. Each hole 41C, 42C is coaxially formed. The anchor bolt 71 is housed in the housing structure 46 by inserting the anchor bolt 71 into each of the holes 41C and 42C so that the anchor bolt 71 straddles the entire recess 44 . This state is hereinafter referred to as a "stored state". The bolts 130 connecting the frame 110 of the building body 100 and the steel foundation 30 are inserted into the holes 42C of the second flange 42 (see FIG. 1).

In the stowed state, the perimeter steel 40 and the anchor set 70 have the following relationship. A portion of the anchor bolt 71 including the first end 71C protrudes from the outer surface 42B of the second flange 42 . A first nut 72A and a second nut 72B are coupled to the anchor bolt 71 so as to sandwich the second flange 42 therebetween. A portion of the anchor bolt 71 including the second end portion 71D protrudes from the outer surface 41B of the first flange 41. As shown in FIG. A third nut 72C, a fourth nut 72D, a fixing plate 73, and an adjusting part 74 are coupled to this portion. The third nut 72</b>C contacts the outer surface 41</b>B of the first flange 41 . Movement of the anchor bolt 71 with respect to the outer peripheral steel material 40 is restricted by each nut 72A to 72C.

When the anchor set 70 is installed on the auxiliary layer 12, a protruding state is formed in which the anchor bolt 71 housed in the housing structure 46 is pulled out from the recess 44, as shown in FIG. The relationship between each steel material 40, 50 and the anchor set 70 in the projected state is the same as the relationship shown in FIG. The length of the anchor bolt 71 positioned outside the recess 44 in the accommodated state of FIG. 8 is shorter than the length of the anchor bolt 71 positioned outside the recess 44 in the projected state of FIG. Therefore, when the outer peripheral steel material 40 is transported in the housed state, the volume of the outer peripheral steel material 40 to which the anchor set 70 is coupled is reduced, thereby improving workability in transport. Note that the above-described items related to the storage state and transportation of the anchor set 70 are also common to the partitioning steel material 50 .

An example of a construction method for the foundation structure 10 will be described with reference to FIGS. 8 to 11. FIG. The construction method of the foundation structure 10 includes first to ninth steps. The fourth step is an example of an arrangement step. The fifth step is an example of the adjustment step. The eighth step is an example of the formation step.

As shown in FIG. 10, an excavated trench GA is formed in the ground G in the first step. Next, a plurality of piles 11 are driven into the bottom GB of the excavated groove GA. In the second step, a dump concrete layer is formed as an auxiliary layer 12 on the bottom GB of the excavated groove GA. In the third step, a plurality of perimeter steel materials 40 and a plurality of division steel materials 50 are carried around the excavated groove GA. Anchor sets 70 are coupled to the perimeter steel members 40 and the section steel members 50 to be carried in so that the stored state shown in FIG. Since each steel material 40, 50 and the anchor set 70 are transported together, the efficiency of material transport is improved. In addition, since most of the anchor bolts 71 are accommodated in the recessed portion 44 of the outer peripheral steel member 40 or the recessed portion 54 of the partition steel member 50 in the accommodated state, the steel members 40 and 50 including the anchor set 70 are less bulky and less material. Workability related to transportation is improved.

In a fourth step, each steel member 40 , 50 is placed on the auxiliary layer 12 via the anchor set 70 . Specifically, this installation is carried out as follows. First, each steel member 40, 50 is placed over the sublayer 12 by means of a conveying machine. Each steel member 40 , 50 is supported by the transport machine until a temporary installation condition is formed in which each steel member 40 , 50 is supported by the anchor set 70 . Next, the first nut 72A is removed from the anchor bolt 71. As shown in FIG. Next, the anchor bolt 71 is pulled out of the recesses 44,54 so that the first end 71C of the anchor bolt 71 is separated from the inner surfaces 42A,52A of the second flanges 42,52 within the recesses 44,54. Next, the second nut 72B is removed from the anchor bolt 71. As shown in FIG. All of the anchor bolts 71 are then pulled out of the recesses 44 , 54 . Next, the anchor bolt 71 is coupled with the second nut 72B. Next, a position including the first end 71C of the anchor bolt 71 is adjusted so that the distance from the inner surfaces 41A, 51A of the first flanges 41, 51 to the first end 71C of the anchor bolt 71 is a predetermined distance. are placed in the recesses 44,54. Next, the first nut 72A is coupled to the anchor bolt 71. As shown in FIG. By the work up to this point, the projecting state shown in FIG. 9 is formed. The adjustment component 74 is then placed on the auxiliary layer 12 .

In a fifth step, the height of the steel foundation 30 with respect to the ground level GL is adjusted. Specifically, this adjustment is performed as follows. First, the height of the reference portion of each steel material 40, 50 relative to the ground level GL (hereinafter referred to as "foundation height") is measured. The reference portion can be arbitrarily determined. In one example, the reference site is the outer surface 42B, 52B of the second flange 42,52 of each steel member 40,50. Next, for the steel materials 40 and 50 whose measured base heights are not within the reference range, the adjusting parts 74 are rotated so that the base heights are included within the reference range. The adjustment of the base height of the steel materials 40 and 50 by the adjusting parts 74 is performed for each steel material 40 and 50 . The adjustment of the base height is performed until the base height of all the steel members 40, 50 is included in the reference range.

In the sixth step, the steel materials 40, 50 are connected using bolts 66 and nuts 67. As shown in FIG. The first connecting portion 31 is formed by connecting the outer peripheral steel materials 40 (see FIG. 3) aligned in the longitudinal direction. The second connecting portion 32 is formed by connecting the outer peripheral steel materials 40 (see FIG. 4) arranged so as to form an angle. The third connecting portion 33 is formed by connecting the outer peripheral steel material 40 and the partition steel material 50 (see FIG. 5) arranged so as to be orthogonal to each other. The fourth connecting portion 34 is formed by connecting the outer peripheral steel material 40 and the partition steel material 50 (see FIG. 6) aligned in the longitudinal direction.

In the seventh step, a formwork (not shown) for forming the concrete foundation 20 is installed in the excavated trench GA. In the eighth step, concrete is poured into the formwork. As the concrete hardens, a concrete foundation 20 corresponding to the shape of the formwork is formed. In a ninth step, the steel foundation 30 is provided with a finishing layer 80 (see FIG. 1). Specifically, this formation is carried out as follows. First, the wire mesh 90 is joined to the base surface 30C of the finishing steel material 40A, which is the outer peripheral steel material 40. As shown in FIG. Next, the inner layer 81 of the finishing layer 80 is formed on the base surface 30C so as to be entwined with the wire mesh 90 . An outer layer 82 is then formed over the cured inner layer 81 . Finishing layer 80 is completed by curing outer layer 82 .

Actions and effects of the base structure 10 will be described. According to the foundation structure 10, when the finishing layer 80 needs to be formed on at least a part of the steel foundation 30, the base surface 30C of the finishing steel material 40A is positioned where the finishing layer 80 is scheduled to be formed. 30 A of perimeter foundations of the steel foundation 30 can be constructed. Since the base surface 30C is located on the outer periphery of the outer peripheral foundation 30A, the finishing layer 80 can be formed without attaching a panel for filling the concave portion of the steel material to the finishing steel material 40A, unlike the conventional foundation structure. Therefore, the construction time of the foundation structure 10 can be shortened.

Note that the above-described embodiments are examples of forms that can be taken by the foundation structure of a building and its construction method related to the present invention, and are not intended to limit the forms. The foundation structure of a building and its construction method related to the present invention can take forms different from those illustrated in the above embodiments. One example is a form in which part of the configuration of the embodiment is replaced, changed, or omitted, or a form in which a new configuration is added to the embodiment.

10: Foundation structure 12: Auxiliary layer 20: Concrete foundation 30: Steel foundation 30A: Peripheral foundation 40: Peripheral steel material 40A: Finished steel material 43B: External surface (web surface)
46: Housing structure 50: Compartment steel material 71: Anchor bolt 74: Adjustment part 80: Finishing layer GL: Ground level

Claims (10)

a concrete foundation, and a steel foundation including a perimeter foundation composed of a plurality of perimeter steel materials and provided on the concrete foundation,
the plurality of perimeter steels includes at least one finishing steel;
The finished steel material includes an outer surface extending between the upper end and the lower end of the finished steel material at the horizontal end perpendicular to the longitudinal direction of the finished steel material,
The perimeter foundation is configured such that the outer surface is positioned on the perimeter of the perimeter foundation,
A wire mesh bonded to the outer surface, an inner layer entwined with the wire mesh, and an outer layer provided on the inner layer are provided on the outer surface located on the outer periphery of the outer peripheral foundation ,
The inner layer is provided so that the step between the outer surface of the concrete foundation and the outer surface of the outer peripheral foundation is small,
The outer layer is provided so as to extend over the inner layer and the foundation made of concrete,
Building foundation structure. The finished steel material is channel steel,
2. The building substructure of claim 1, wherein said outer surface is a web surface of said channel steel. The foundation structure of the building according to claim 1 or 2, wherein all of the plurality of peripheral steel materials are the finishing steel materials. said steel foundation further comprising at least one section steel positioned within said perimeter foundation;
The outer peripheral steel material and the partition steel material are shaped steels,
The basic structure of the building according to any one of claims 1 to 3, wherein the type of section steel is different from the type of section steel of the peripheral steel. The building foundation structure according to claim 4, wherein the section steel material is H-beam steel. The building foundation structure according to any one of claims 1 to 5, wherein the outer peripheral steel material has a housing structure for housing anchor bolts. anchor bolts attached to the steel foundation;
The building foundation structure according to any one of claims 1 to 6, further comprising adjusting parts attached to the anchor bolts so as to adjust the height of the steel foundation relative to the ground level. 8. The building foundation structure according to claim 7, wherein a material forming said adjustment parts is synthetic resin or concrete. An arrangement step of arranging a steel foundation including a perimeter foundation composed of a plurality of perimeter steel materials on an auxiliary layer via anchor bolts;
A building foundation including a forming step of forming a concrete foundation for supporting the steel foundation between the auxiliary layer and the steel foundation, and a finishing step of forming a finishing layer on the steel foundation. A construction method for a structure, comprising:
The arranging step includes using at least one finished steel material having an outer surface that extends between upper and lower ends at horizontal ends perpendicular to the longitudinal direction, the outer surface being located on the perimeter of the perimeter foundation. build a foundation,
In the finishing step, a wire mesh is joined to the outer surface located on the outer periphery of the outer peripheral foundation, an inner layer is formed so as to be entwined with the wire mesh, and the hardened inner layer and the outer surface of the concrete foundation are combined. forming an outer layer to cover ,
In the finishing step, the inner layer is formed so that the step between the outer surface of the concrete foundation and the outer surface of the outer peripheral foundation is small.
A construction method for the foundation structure of a building. A step performed between the placing step and the forming step, further comprising an adjusting step of adjusting the height of the steel foundation with respect to the ground level by rotating adjusting parts attached to the anchor bolts. The construction method of the foundation structure of the building according to claim 9.

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