WO2020202658A1 - コンクリート基礎構造およびその施工方法 - Google Patents
コンクリート基礎構造およびその施工方法 Download PDFInfo
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- WO2020202658A1 WO2020202658A1 PCT/JP2019/049486 JP2019049486W WO2020202658A1 WO 2020202658 A1 WO2020202658 A1 WO 2020202658A1 JP 2019049486 W JP2019049486 W JP 2019049486W WO 2020202658 A1 WO2020202658 A1 WO 2020202658A1
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- concrete foundation
- precast concrete
- hole
- backfill
- connecting member
- Prior art date
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/01—Flat foundations
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/32—Foundations for special purposes
- E02D27/50—Anchored foundations
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/01—Flat foundations
- E02D27/016—Flat foundations made mainly from prefabricated concrete elements
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/01—Flat foundations
- E02D27/02—Flat foundations without substantial excavation
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/01—Flat foundations
- E02D27/08—Reinforcements for flat foundations
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
- E02D5/36—Concrete or concrete-like piles cast in position ; Apparatus for making same making without use of mouldpipes or other moulds
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2200/00—Geometrical or physical properties
- E02D2200/16—Shapes
- E02D2200/165—Shapes polygonal
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2250/00—Production methods
- E02D2250/0023—Cast, i.e. in situ or in a mold or other formwork
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2250/00—Production methods
- E02D2250/003—Injection of material
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0004—Synthetics
- E02D2300/0018—Cement used as binder
- E02D2300/002—Concrete
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2600/00—Miscellaneous
- E02D2600/20—Miscellaneous comprising details of connection between elements
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2600/00—Miscellaneous
- E02D2600/30—Miscellaneous comprising anchoring details
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2600/00—Miscellaneous
- E02D2600/40—Miscellaneous comprising stabilising elements
Definitions
- the present invention relates to a concrete foundation structure using a precast concrete foundation and a construction method thereof.
- Concrete foundations such as cloth foundations, solid foundations and independent foundations are generally used as foundations for receiving the load of buildings.
- the process of assembling the formwork on site the process of incorporating the reinforcing bars according to the structural design, the process of pouring concrete into the formwork, the process of hardening the concrete, the process of removing the formwork, etc. Since many steps are required, there is a problem that the construction period becomes long. Further, since these foundations are manually constructed at the site, there is a problem that an error is likely to occur in the finishing accuracy. Further, since it is necessary to secure skilled technicians and special vehicles such as concrete pump trucks, there is a problem that the construction cost is high.
- This foundation structure includes a concrete foundation plate arranged on the surface of the ground and an underground anchor driven into the ground, and the concrete foundation plate and the underground anchor are connected to each other. According to this foundation structure, since the concrete foundation plate can be produced at the factory, it is possible to omit the concrete placing work at the site.
- Patent Document 1 the basic structure described in Patent Document 1 is used for the purpose of receiving the load of equipment such as an electric water heater, and is not supposed to be used for the purpose of receiving the load of a building. Therefore, if the foundation structure is used for the purpose of receiving the load of the building, the concrete foundation plate may sink, or the underground anchor may be pulled out by the force of the wind hitting the building and the concrete foundation plate may move. It was.
- the present invention has been made to deal with the above problems, and an object of the present invention is to provide a concrete foundation structure and a construction method thereof capable of firmly fixing a precast concrete foundation to the ground.
- the features of the concrete foundation structure according to the present invention are a precast concrete foundation arranged on the surface of the ground, an excavation hole formed by excavating the ground below the precast concrete foundation, and the like.
- a plate-shaped anchor plate arranged inside the drilled hole, a rod-shaped connecting member connecting the precast concrete foundation and the anchor plate, and a backfill material containing a solidifying material are backfilled in the drilled hole.
- the precast concrete foundation includes a backfilling portion and a filling layer formed by filling the backfilling material containing a solidifying material between the precast concrete foundation and the backfilling portion, and the precast concrete foundation has the backfilling portion. It has a foundation main body configured to cover from above, and a protruding portion provided so as to project downward from the outer peripheral portion of the foundation main body and embedded in the ground.
- the backfill portion formed below the precast concrete foundation is solidified using a solidifying material
- the filling layer formed between the precast concrete foundation and the backfilling portion is a solidifying material. Since it is hardened using, the precast concrete foundation can be stably supported by the backfill part and the filling layer. Further, since the anchor plate connected to the precast concrete foundation is embedded in the backfill portion, the precast concrete foundation and the backfill portion are integrated, so that the space between the outer surface of the backfill portion and the inner surface of the excavation hole The movement of the precast concrete foundation can be suppressed by the frictional force acting on.
- the protruding portion of the precast concrete foundation is embedded in the ground, the movement of the precast concrete foundation can be suppressed by the frictional force acting between the protruding portion and the ground. Therefore, the precast concrete foundation can be firmly fixed to the ground.
- Another feature of the concrete foundation structure according to the present invention is that the protruding portion is formed in an annular shape on the outer peripheral portion of the foundation body.
- the protruding portion is formed in an annular shape on the outer peripheral portion of the foundation body, the upper part of the backfill portion can be surrounded by the protruding portion, and the ground can be present all around the protruding portion. it can. Therefore, when a horizontal external force acts on the precast concrete foundation, the backfill portion and the ground can effectively suppress the movement of the precast concrete foundation.
- the foundation body is provided with a through hole through which the connecting member is inserted, and a portion of the connecting member protruding upward from the through hole is provided.
- a movement blocking portion is provided that abuts on the foundation body and prevents the precast concrete foundation from moving upward.
- the upper end portion of the connecting member embedded in the backfill portion is inserted into the through hole provided in the base body, and then the movement blocking portion is provided in the portion protruding upward from the through hole of the connecting member. be able to. Therefore, when the backfill portion is formed, the precast concrete foundation can be separated from the connecting member, and the work of forming the backfill portion can be efficiently performed.
- Another feature of the concrete foundation structure according to the present invention is that the inside of the through hole is filled with a filler of the same type as the filler, and the filler filled inside the through hole is the same. It is that it is continuously integrated with the filler constituting the filler layer.
- the first part of the connecting member existing between the precast concrete foundation and the backfill portion and the second part of the connecting member existing inside the through hole are made of one continuous filler. Since it can be wrapped, it is possible to prevent a shearing force from acting on the boundary portion between the first portion and the second portion, and it is possible to enhance the durability of the connecting member.
- Another feature of the concrete foundation structure according to the present invention is that the through hole is formed so that the cross-sectional area decreases downward.
- the through hole is formed so that the cross-sectional area becomes smaller downward. Therefore, when the precast concrete foundation is to be separated from the filling layer, the filler filled inside the through hole penetrates. It gets caught on the inner surface of the hole. Therefore, the precast concrete foundation is difficult to separate from the packed bed.
- the features of the concrete foundation structure construction method according to the present invention are the step (a) of excavating the ground to provide an excavation hole and the plate-shaped anchor plate at the lower end of the rod-shaped connecting member.
- the backfilling material containing the solidifying material is backfilled in the excavation hole to form the backfilling portion, so that the backfilling portion can be formed firmly.
- the filler containing the solidifying material is filled between the precast concrete foundation and the backfill portion, the filling layer composed of the filler can be formed firmly. Therefore, the precast concrete foundation can be stably supported by the backfill portion and the filling layer.
- the anchor plate and the connecting member are arranged inside the excavation hole, in the step (c), the backfill material is backfilled in the excavation hole to form the backfill portion, and in the step (g).
- the movement blocking portion is attached to the portion protruding upward from the through hole of the connecting member, the precast concrete foundation and the backfill portion can be integrated. Therefore, the movement of the precast concrete foundation can be suppressed by the frictional force acting between the outer surface of the backfill portion and the inner surface of the excavation hole.
- Another feature of the construction method of the concrete foundation structure according to the present invention is that in the step (f), the filler is also filled inside the through hole, and between the precast concrete foundation and the backfill portion.
- the purpose is to continuously integrate the filled filler and the filler filled inside the through hole.
- the first part of the connecting member existing between the precast concrete foundation and the backfill portion and the second part of the connecting member existing inside the through hole are made of one continuous filler. Since it can be wrapped, it is possible to prevent a shearing force from acting on the boundary portion between the first portion and the second portion, and it is possible to enhance the durability of the connecting member.
- Another feature of the construction method of the concrete foundation structure according to the present invention is that in the step (f), the filler is filled between the precast concrete foundation and the backfill portion through the through hole.
- Another feature of the construction method of the concrete foundation structure according to the present invention is that in the step (c), the backfilling portion is compacted.
- the backfilling portion since the backfilling portion is compacted in the step (c), the backfilling portion can be formed more firmly.
- step (e) the height adjuster having a male screw portion extending in the vertical direction and a female screw portion screwed into the male screw portion is precast.
- the height adjuster having a male screw portion extending in the vertical direction and a female screw portion screwed into the male screw portion is precast.
- the height of the precast concrete foundation is adjusted in the process (e), so that the concrete foundation structure can be constructed with high accuracy. Further, since the height adjusting tool has a simple structure having a male threaded portion and a female threaded portion, the height adjusting work can be easily performed.
- (A) is a cross-sectional view showing a process of providing a drilling hole
- (B) is a cross-sectional view showing a process of arranging an anchor plate and a connecting member inside the drilling hole
- (C) is a cross-sectional view of a backfill material being drilled. It is sectional drawing which shows the process of backfilling.
- (D) is a cross-sectional view showing a process of arranging a precast concrete foundation on the surface of the ground
- (E) is a cross-sectional view showing a process of forming a filling layer
- (F) is a cross-sectional view of attaching a precast concrete foundation to a connecting member. It is sectional drawing which shows the process.
- (A) is a front view showing a state in which a height adjuster is attached to a precast concrete foundation
- (B) is a plan view showing a state in which a height adjuster is attached to a precast concrete foundation. It is sectional drawing for demonstrating the process of forming a packing layer in detail.
- FIG. 1 is a cross-sectional view showing the configuration of the concrete foundation structure 10 according to the embodiment of the present invention.
- FIG. 2 is a cross-sectional view showing a usage example of the concrete foundation structure 10.
- FIG. 3 is a plan view showing a usage example of the concrete foundation structure 10.
- FIG. 4 is an exploded perspective view showing a part of the structure of the concrete foundation structure 10 as viewed from diagonally above.
- FIG. 5 is an exploded perspective view showing a part of the structure of the concrete foundation structure 10 as viewed from diagonally below.
- the concrete foundation structure 10 shown in FIG. 1 is a structure that receives the load of the building 12 on the surface of the ground G.
- the four concrete foundation structures 10 are provided so as to secure the required support area (for example, 1/3 or more of the floor area) determined according to the floor area of the building 12. It is constructed at a distance from each other.
- a joist 14a constituting the floor structure 14 is fixed to the upper part of each concrete foundation structure 10, and a load of the entrance porch 12a is received by using each half of the two concrete foundation structures 10.
- a space S (including in the soil) for passing various pipes P such as water and sewage, electricity and gas is formed between two concrete foundation structures 10 adjacent to each other.
- This space S serves as a ventilation path for taking in outside air into the underfloor space and discharging the humidity of the underfloor space to the outside.
- the pipe P is fixed to the concrete foundation structure 10 by using the pipeline holding member 62.
- the concrete foundation structure 10 includes a precast concrete foundation 16, an excavation hole 18, an anchor plate 20, two connecting members 22, a backfill portion 24, and a filling layer 26.
- the precast concrete foundation 16, the anchor plate 20, and the two connecting members 22 are manufactured in the factory, and the excavation hole 18, the backfill portion 24, and the filling layer 26 are constructed in the field.
- the precast concrete foundation 16 is a rectangular plate-shaped or block-shaped member in a plan view formed of concrete.
- the precast concrete foundation 16 is provided in a foundation main body 28 configured to cover the backfill portion 24 (FIG. 1) from above and protruding downward from the outer peripheral portion of the foundation main body 28 and embedded in the ground G (FIG. 1). It has a protruding portion 30 to be formed.
- the foundation main body 28 has two quadrangular recesses 32 in a plan view opened upward.
- the two recesses 32 are provided side by side in the length direction of the base body 28, and a partition portion 34 is formed between the two recesses 32.
- the upper surface 28a of the foundation main body 28 in which the opening 32a of each recess 32 is opened is formed flat at a constant height.
- the upper surface 28a is a support surface that receives the load of the building 12.
- a plurality of female screw members 40 into which bolts 38 for fixing the joists 14a and the like shown in FIG. 1 are screwed are embedded in the upper surface 28a.
- each of the two recesses 32 is provided with a through hole 42 through which the connecting member 22 is inserted. Further, a plurality of female screw members 46 into which hanging metal fittings 44 (FIGS. 8A and 8B) such as eyebolts are screwed are embedded in the bottom portion 32b of each of the two recesses 32.
- the through hole 42 has both a function of inserting the connecting member 22 and a function of introducing a filler 96 (FIG. 9) between the precast concrete foundation 16 and the backfill portion 24.
- the through hole 42 is formed in a tapered shape so that the cross-sectional area decreases downward.
- a connecting member 22 is inserted inside the through hole 42. Further, the inside of the through hole 42 is filled with a filler 96 of the same type as the filler 96, which will be described later, which constitutes the filler layer 26.
- the filler 96 filled inside the through hole 42 is continuously integrated with the filler 96 constituting the filler layer 26.
- a step portion 48 is formed at one end in the width direction (direction orthogonal to the length direction) in the upper part of the foundation main body 28.
- the upper surface 48a of the stepped portion 48 is formed flat at a height lower than the upper surface 28a of the foundation main body 28.
- the upper surface 48a is a support surface that supports a rod-shaped support 50 (FIG. 3) or the like that receives the load of the building 12.
- a plurality of female screw members 54 into which bolts 52 (FIG. 3) for fixing the support 50 and the like are screwed are embedded in the upper surface 48a of the step portion 48.
- the protruding portion 30 is formed in an annular shape on the outer peripheral portion of the foundation main body 28.
- the protruding portion 30 is formed in a rectangular wall shape in the bottom view so that the shape of the precast concrete foundation 16 in the bottom view is rectangular.
- a storage space 56 for accommodating the upper part of the backfill portion 24 (FIG. 1) is configured inside the projecting portion 30 inside the projecting portion 30.
- the inner side surface 30a of the projecting portion 30 is formed so as to be inclined so that the cross section (horizontal cross section) of the accommodation space 56 gradually widens downward.
- a part of the reinforcing bar 74 which will be described later, is arranged so as to extend in the inclined direction along the inner side surface 30a of the protruding portion 30, whereby the strength of the protruding portion 30 against an external force acting from the horizontal direction is increased.
- the lower surface 30b of the protrusion 30 in which the opening 56a of the accommodation space 56 is opened is formed flat.
- a plurality of bolts 64 for fixing the pipeline holding member 62 and the like shown in FIG. 1 are screwed into each of the four side surfaces 58a, 58b, 60a, and 60b of the precast concrete foundation 16.
- the female screw member 66 of the above is embedded.
- a plurality of female screw members into which bolts 70 for fixing the height adjusters 68 shown in FIGS. 8A and 8B are screwed onto both side surfaces 60a and 60b of the precast concrete foundation 16 in the width direction. 72 is embedded.
- reinforcing bars 74 for reinforcing these are embedded in each of the foundation body 28 and the protrusion 30.
- the size of the precast concrete foundation 16 is defined as 2516 mm in length, 1367 mm in width, and 600 mm in height.
- the weight of the precast concrete foundation 16 is set to 2765 kg.
- the size of the opening 56a of the accommodation space 56 is defined to be 2216 mm in length and 1067 mm in width.
- the size of the through hole 42 is defined as an inner diameter of 60 mm at the upper end and an inner diameter of 50 mm at the lower end.
- the anchor plate 20 is a rectangular plate-shaped member in a plan view, and is formed of a metal material such as rolled steel with a strength that does not easily bend.
- the anchor plate 20 is provided with two through holes 76 through which the connecting member 22 is inserted, spaced apart from each other in the length direction.
- the size of the anchor plate 20 is defined to be 2000 mm in length, 800 mm in width, and 12 mm in pressure.
- the connecting member 22 is a member that connects the precast concrete foundation 16 and the anchor plate 20, and is formed of a metal material such as stainless steel in a rod shape having a circular cross section.
- a first male threaded portion 78a is provided at one end (lower end) of the connecting member 22, and a second male threaded portion 78b is provided at the other end (upper end) of the connecting member 22.
- the size of the connecting member 22 is defined to have a length of 1000 to 2000 mm and a diameter of 20 mm.
- the strength of the connecting member 22 is set to a shear strength of 7t.
- the connecting member 22 is arranged so as to extend in the vertical direction inside the excavation hole 18.
- the first male threaded portion 78a of the connecting member 22 is inserted into the through hole 76 of the anchor plate 20, and the anchor plate 20 is sandwiched between the two female threaded members 80 and 82 screwed into the first male threaded portion 78a. ing.
- the anchor plate 20 is attached to the lower end of the connecting member 22.
- the second male threaded portion 78b of the connecting member 22 is inserted into the through hole 42 of the precast concrete foundation 16, and the movement blocking portion 84 is attached to the portion of the second male threaded portion 78b protruding upward from the through hole 42. ing.
- the precast concrete foundation 16 is attached to the upper end of the connecting member 22.
- the movement blocking portion 84 is a member that abuts on the foundation body 28 to prevent the precast concrete foundation 16 from moving upward, and is screwed into the second male threaded portion 78b of the connecting member 22 as shown in FIG. It has a female screw 84a.
- the excavation hole 18 is formed in a rectangular shape in a plan view by excavating the ground G below the precast concrete foundation 16.
- a step portion 86 is provided on the inner peripheral portion of the upper portion of the excavation hole 18, and a concrete layer 88 and a bassa mortar layer 90 are formed on the upper surface of the step portion 86 in this order.
- the concrete layer 88 is a reinforcing layer for reinforcing the upper surface of the step portion 86
- the basa mortar layer 90 is a height adjusting layer for adjusting the height of the precast concrete foundation 16.
- a wall surface 92 of the ground G is formed around the area of the bassa mortar layer 90 on which the precast concrete foundation 16 is placed.
- the size of the excavation hole 18 is defined to be 2100 mm in length, 900 mm in width, and 1000 to 2000 mm in depth.
- the opening 18a of the excavation hole 18 is arranged inside the opening 56a of the accommodation space 56 of the precast concrete foundation 16 in a plan view, and the wall surface 92 of the ground G is a protruding portion of the precast concrete foundation 16 in a plan view. It is arranged outside the outer surface of 30. Therefore, the protruding portion 30 of the precast concrete foundation 16 can be placed on the stepped portion 86, and the precast concrete foundation 16 can be stably supported by the ground G constituting the stepped portion 86.
- the backfilling portion 24 is configured by backfilling a backfilling material 94 containing a cement-based solidifying material and soil that solidifies in response to water in the excavation hole 18. Further, the backfill portion 24 is firmly solidified by being compacted, and the outer surface of the backfill portion 24 is in close contact with the inner surface of the excavation hole 18. Since the excavation hole 18 of the present embodiment is formed in a rectangular shape in a plan view, the backfill material 94 backfilled in the excavation hole 18 is solidified into a square columnar shape inside the excavation hole 18, and the anchor plate 20 and It is integrated with the connecting member 22. The upper part of the backfill portion 24 is housed in the accommodating space 56 of the precast concrete foundation 16, and the entire upper surface 24a of the backfill portion 24 faces the lower surface 16a of the precast concrete foundation 16 constituting the accommodating space 56. Have been placed.
- the filling layer 26 is configured by filling a filler 96 containing a cement-based solidifying material that solidifies in response to water between the precast concrete foundation 16 and the backfill portion 24.
- This filler 96 is sometimes referred to as "cement milk”.
- cement milk As described above, in the present embodiment, since the entire upper surface 24a of the backfill portion 24 is arranged to face the lower surface 16a of the precast concrete foundation 16, the entire upper surface 24a of the backfill portion 24 and the precast concrete foundation The lower surface 16a of 16 can be connected by the packing layer 26. Therefore, the load of the building 12 acting on the precast concrete foundation 16 can be received by the entire backfill portion 24.
- FIG. 6 (A) is a cross-sectional view showing a process of providing the excavation hole 18, and FIG. 6 (B) is a cross-sectional view showing a process of arranging the anchor plate 20 and the connecting member 22 inside the excavation hole 18, FIG. C) is a cross-sectional view showing a step of backfilling the backfill material 94 into the excavation hole 18.
- 7 (D) is a cross-sectional view showing a step of arranging the precast concrete foundation 16 on the surface of the ground G
- FIG. 7 (E) is a cross-sectional view showing a step of forming the packed bed 26
- FIG. 7 (F) is a cross-sectional view.
- Is a cross-sectional view showing a process of attaching a precast concrete foundation 16 to a connecting member 22.
- the position where the concrete foundation structure 10 is to be constructed is determined at the construction site of the building 12 (FIG. 3). Then, as shown in FIG. 6A, the ground G at the determined position is dug to form the excavation hole 18. At this time, a step portion 86 is formed on the inner peripheral portion of the upper portion of the excavation hole 18.
- step (b) the anchor plate 20 shown in FIGS. 4 and 5 is attached to the lower end of the rod-shaped connecting member 22 by using two female screw members 80 and 82. Then, as shown in FIG. 6B, the anchor plate 20 and the two connecting members 22 are arranged inside the excavation hole 18. At this time, the anchor plate 20 is arranged horizontally, and the two connecting members 22 are arranged perpendicular to the anchor plate 20.
- the backfill material 94 containing the solidifying material and soil that solidifies in response to water is backfilled in the excavation hole 18 to form the backfill portion 24. Further, the upper end portion of the connecting member 22 is projected upward from the upper surface 24a of the backfill portion 24. Then, the backfilling portion 24 is compacted to remove the air contained in the backfilling portion 24. Then, the backfilling portion 24 becomes hardened in combination with the solidifying material reacting with the moisture of the soil and solidifying.
- step (d) the precast concrete foundation 16 shown in FIGS. 4 and 5 is prepared.
- the precast concrete foundation 16 has a foundation main body 28 and a protruding portion 30, and the foundation main body 28 is provided with a through hole 42 through which the connecting member 22 is inserted. Since the size and weight of the precast concrete foundation 16 are determined as described above, it can be transported by vehicle, and the precast concrete foundation 16 manufactured with high precision using factory equipment is mounted on the vehicle and placed on site. Can be carried in.
- the precast concrete foundation 16 is arranged on the surface of the ground G, and the connecting member 22 is inserted through the through hole 42. Further, the height of the precast concrete foundation 16 is adjusted by using the two height adjusters 68 shown in FIGS. 8A and 8B.
- FIG. 8A is a front view showing a state in which the height adjuster 68 is attached to the precast concrete foundation 16, and FIG. 8B is a state in which the height adjuster 68 is attached to the precast concrete foundation 16. It is a plan view which shows.
- the height adjuster 68 includes a support 100 having two male screw portions 98 extending in the vertical direction and a female screw portion 100a into which the male screw portions 98 are screwed.
- the two supports 100 have a fixed base 102.
- the length of the substrate 102 is set to be substantially the same as the length of the precast concrete foundation 16.
- the two supports 100 are fixed to both ends of the substrate 102 in the length direction.
- the base 102 is provided with a plurality of through holes 104 through which bolts 70 screwed into the female screw members 72 (FIGS. 4 and 5) of the precast concrete foundation 16 are inserted.
- two height adjusters 68 are used with bolts 70 on both side surfaces 60a of the precast concrete foundation 16 in the width direction. Attach to 60b. Further, as shown in FIG. 7D, a concrete layer 88 and a bassa mortar layer 90 are formed in this order on the upper surface of the step portion 86. Subsequently, the precast concrete foundation 16 is suspended by the wires W shown in FIGS. 8A and 8B, placed on the bassa mortar layer 90, and the height of the precast concrete foundation 16 is measured.
- the male threaded portion 98 is rotated to change the length of the protruding portion 98a protruding downward from the precast concrete foundation 16 of the male threaded portion 98 so that the measured value matches the design value of the precast concrete foundation 16. Adjust the height.
- the height of the precast concrete foundation 16 can be adjusted accurately by rotating each male threaded portion 98 as appropriate. ..
- the number of male threaded portions 98 attached to the precast concrete foundation 16 is not particularly limited, and may be 3 or less, or 5 or more.
- a filler 96 containing a solidifying material and water that solidifies in response to water is passed through the through hole 42 between the precast concrete foundation 16 and the backfill portion 24. Fill in. Then, the solidifying material of the filler 96 reacts with water and solidifies, so that the filling layer 26 is formed between the precast concrete foundation 16 and the backfill portion 24. At this time, since a part of the filler 96 penetrates into the backfilling portion 24, the filling layer 26 is firmly integrated with the backfilling portion 24.
- FIG. 9 is a cross-sectional view for explaining in detail the process of forming the packed bed 26.
- step (f) as shown in FIG. 9, a part of the filler 96 is also filled inside the through hole 42, and the filler 96 is filled between the precast concrete foundation 16 and the backfill portion 24.
- the filler 96 filled inside the through hole 42 is continuously integrated.
- the movement blocking portion 84 that abuts on the foundation body 28 and prevents the precast concrete foundation 16 from moving upward is moved upward from the through hole 42 of the connecting member 22. Attach to the protruding part. That is, the female screw 84a (FIG. 4) of the movement blocking portion 84 is screwed into the second male screw portion 78b of the connecting member 22. (Effect of embodiment) According to the present embodiment, the following effects can be achieved by the above configuration. That is, the backfill portion 24 formed below the precast concrete foundation 16 shown in FIG. 1 is solidified using a solidifying material, and the filling layer formed between the precast concrete foundation 16 and the backfill portion 24. Since 26 is hardened using a solidifying material, the backfill portion 24 and the filling layer 26 can stably support the precast concrete foundation 16.
- the precast concrete foundation 16 and the backfill portion 24 are integrated, so that the backfill portion
- the movement of the precast concrete foundation 16 can be suppressed by the frictional force acting between the outer surface of the 24 and the inner surface of the excavation hole 18.
- the protruding portion 30 of the precast concrete foundation 16 is embedded in the ground G, the movement of the precast concrete foundation 16 can be suppressed by the frictional force acting between the protruding portion 30 and the ground G. Therefore, the precast concrete foundation 16 can be firmly fixed to the ground G.
- the projecting portion 30 is formed in an annular shape on the outer peripheral portion of the foundation main body 28, the upper portion of the backfill portion 24 can be surrounded by the projecting portion 30, and the projecting portion 30 can be surrounded by the entire circumference.
- the wall surface 92 (FIG. 1) of the ground G can be present. Therefore, when an external force in the horizontal direction acts on the precast concrete foundation 16, the backfill portion 24 and the ground G can effectively suppress the movement of the precast concrete foundation 16.
- the precast concrete foundation 16 is connected to the connecting member when the backfill portion 24 is configured. It can be separated from the 22 and the work of forming the backfill portion 24 can be efficiently performed.
- the first portion 22a of the connecting member 22 existing between the precast concrete foundation 16 and the backfill portion 24 and the second portion 22b of the connecting member 22 existing inside the through hole 42 are formed. Since it can be wrapped with one continuous filler 96, it is possible to prevent a shearing force from acting on the boundary portion between the first portion 22a and the second portion 22b, and it is possible to increase the durability of the connecting member 22. ..
- the through hole 42 is formed so that the cross-sectional area decreases downward, when the precast concrete foundation 16 is to be separated from the filling layer 26, the inside of the through hole 42 is filled.
- the filler 96 is caught on the inner surface of the through hole 42. Therefore, the precast concrete foundation 16 is difficult to separate from the packing layer 26.
- the filler 96 can be filled between the precast concrete foundation 16 and the backfill portion 24 through the through hole 42 for inserting the connecting member 22, the filler 96 can be filled. It is not necessary to separately form the through hole of the precast concrete foundation 16, and the manufacturing cost of the precast concrete foundation 16 can be kept low.
- the height adjuster 68 shown in FIG. 8 has a simple structure having a male threaded portion 98 and a female threaded portion 100a, the work of adjusting the height of the precast concrete foundation 16 can be easily performed.
- the concrete foundation structure 10 is used for supporting the building 12, but the concrete foundation structure 10 is used for supporting street lights, signboards, greenhouses, mechanical devices, and the like. May be good. Further, the size and weight of the concrete foundation structure 10 may be appropriately changed depending on the application.
- the precast concrete foundation 16 and the anchor plate 20 are formed in a rectangular shape in a plan view, but these can be formed in other shapes such as a square, a circle, an ellipse, a triangle, a pentagon and a hexagon in a plan view. It may be formed.
- the protruding portion 30 is formed in an annular shape on the outer peripheral portion of the foundation main body 28, but the protruding portion 30 may be formed intermittently on the outer peripheral portion of the foundation main body 28, or a part of the annular portion. May be formed in a shape lacking.
- the through hole 42 is formed in a tapered shape, but the shape of the through hole 42 may be a shape in which the cross-sectional area becomes smaller toward the bottom, for example, a through hole formed with a constant inner diameter. It may be formed in a shape having protrusions on the inner surface of the hole. Further, instead of the through hole 42, a normal through hole (not shown) having a constant inner diameter may be provided. Even in this case, the first portion 22a of the connecting member 22 existing between the precast concrete foundation 16 and the backfill portion 24 and the second portion 22b of the connecting member 22 existing inside the through hole (not shown) are formed. Since it can be wrapped with one continuous filler 96, it is possible to prevent a shearing force from acting on these boundaries, and it is possible to increase the durability of the connecting member 22.
- the anchor plate 20 is fixed to the connecting member 22 by two female screw members 80 and 82, but the method of fixing the anchor plate 20 may be appropriately changed.
- the female screw member 82 arranged on the upper side of the anchor plate 20 may be omitted.
- the lower end portion of the connecting member 22 may be bent and hooked on the anchor plate 20.
- the movement blocking portion 84 is configured as a member having a female screw 84a (FIG. 4), but the configuration of the movement blocking portion 84 may be appropriately changed.
- the movement blocking portion 84 may be configured as a member having a male screw screwed into the female screw portion. Even in this case, the movement blocking portion 84 is attached to a portion of the connecting member 22 protruding upward from the through hole 42 and abuts on the foundation main body 28.
- the cement-based solidifying material is used as the solidifying material for the backfilling material 94 and the filling material 96, but other types of solidifying materials may be used.
- a lime-based solidifying material or a composite solidifying material in which a cement-based solidifying material and a lime-based solidifying material are mixed may be used.
- the filler 96 constituting the filling layer 26 is filled from the through hole 42 for inserting the connecting member 22, but the through hole provided separately from the through hole 42 (not shown).
- the filler 96 constituting the filling layer 26 may be filled from.
- G Ground, 10 ... Concrete foundation structure, 12 ... Building, 14 ... Floor structure, 16 ... Precast concrete foundation, 18 ... Drilling hole, 20 ... Anchor plate, 22 ... Connecting member, 24 ... Backfilling part, 26 ... Filling layer , 28 ... Foundation body, 30 ... Projection, 42 ... Through hole, 68 ... Height adjuster, 84 ... Movement blocking part, 94 ... Backfill material, 96 ... Filler.
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Abstract
Description
図1は、本発明の実施形態に係るコンクリート基礎構造10の構成を示す断面図である。図2は、コンクリート基礎構造10の使用例を示す断面図である。図3は、コンクリート基礎構造10の使用例を示す平面図である。図4は、コンクリート基礎構造10の一部の構成を示す斜め上方から見た分解斜視図である。図5は、コンクリート基礎構造10の一部の構成を示す斜め下方から見た分解斜視図である。
図6(A)は、掘削穴18を設ける工程を示す断面図、図6(B)は、掘削穴18の内部にアンカープレート20および連結部材22を配置する工程を示す断面図、図6(C)は、埋戻し材94を掘削穴18に埋め戻す工程を示す断面図である。図7(D)は、プレキャストコンクリート基礎16を地盤Gの表面に配置する工程を示す断面図、図7(E)は、充填層26を形成する工程を示す断面図、図7(F)は、プレキャストコンクリート基礎16を連結部材22に取り付ける工程を示す断面図である。コンクリート基礎構造10を施工する際には、施工者は、以下の各工程(a)~(g)をこの順に実行する。
(実施形態の効果)
本実施形態によれば、上記構成により以下の各効果を奏することができる。すなわち、図1に示すプレキャストコンクリート基礎16の下方に構成された埋戻し部24が、固化材を用いて固められており、プレキャストコンクリート基礎16と埋戻し部24との間に構成された充填層26が、固化材を用いて固められているので、埋戻し部24および充填層26でプレキャストコンクリート基礎16を安定して支持できる。
なお、本発明の実施にあたっては、上記実施形態に限定されず、本発明の目的を逸脱しない限りにおいて種々の変更が可能である。すなわち、上記実施形態では、コンクリート基礎構造10が建物12を支持する用途に用いられているが、コンクリート基礎構造10は、街路灯、看板、ビニールハウスおよび機械装置などを支持する用途に用いられてもよい。また、コンクリート基礎構造10のサイズおよび重量は、用途に応じて適宜変更されてもよい。
Claims (10)
- 地盤の表面に配置されたプレキャストコンクリート基礎と、
前記プレキャストコンクリート基礎の下方の前記地盤を掘削して構成された掘削穴と、
前記掘削穴の内部に配置された板状のアンカープレートと、
前記プレキャストコンクリート基礎と前記アンカープレートとを連結した棒状の連結部材と、
固化材を含む埋戻し材を前記掘削穴に埋め戻して構成された埋戻し部と、
固化材を含む充填材を前記プレキャストコンクリート基礎と前記埋戻し部との間に充填して構成された充填層とを備え、
前記プレキャストコンクリート基礎は、前記埋戻し部を上方から覆うように構成された基礎本体と、前記基礎本体の外周部から下方に突出して設けられて前記地盤に埋め込まれた突出部とを有している、コンクリート基礎構造。 - 前記突出部は、前記基礎本体の外周部に環状に形成されている、請求項1に記載のコンクリート基礎構造。
- 前記基礎本体には、前記連結部材が挿通される貫通孔が設けられており、
前記連結部材の前記貫通孔から上方に突出した部分には、前記基礎本体に当接して前記プレキャストコンクリート基礎の上方への移動を阻止する移動阻止部が設けられている、請求項1または2に記載のコンクリート基礎構造。 - 前記貫通孔の内部には、前記充填材と同種の充填材が充填されており、
前記貫通孔の内部に充填された前記充填材は、前記充填層を構成する前記充填材と連続して一体化されている、請求項3に記載のコンクリート基礎構造。 - 前記貫通孔は、下方に向かって横断面積が小さくなるように形成されている、請求項4に記載のコンクリート基礎構造。
- 地盤を掘削して掘削穴を設ける工程(a)と、
板状のアンカープレートを棒状の連結部材の下端部に取り付けるとともに、前記アンカープレートおよび前記連結部材を前記掘削穴の内部に配置する工程(b)と、
固化材を含む埋戻し材を前記掘削穴に埋め戻して埋戻し部を構成するとともに、前記連結部材の上端部を前記埋戻し部の上面から上方に突出させる工程(c)と、
前記連結部材を挿通させるための貫通孔が設けられた基礎本体を有するプレキャストコンクリート基礎を準備する工程(d)と、
前記プレキャストコンクリート基礎を前記地盤の表面に配置して前記貫通孔に前記連結部材を挿通させる工程(e)と、
固化材を含む充填材を前記プレキャストコンクリート基礎と前記埋戻し部との間に充填する工程(f)と、
前記基礎本体に当接して前記プレキャストコンクリート基礎の上方への移動を阻止する移動阻止部を前記連結部材の前記貫通孔から上方に突出した部分に取り付ける工程(g)とを備える、コンクリート基礎構造の施工方法。 - 前記工程(f)では、前記貫通孔の内部にも前記充填材を充填し、前記プレキャストコンクリート基礎と前記埋戻し部との間に充填された前記充填材と前記貫通孔の内部に充填された前記充填材とを連続させて一体化させる、請求項6に記載のコンクリート基礎構造の施工方法。
- 前記工程(f)では、前記充填材を前記貫通孔から前記プレキャストコンクリート基礎と前記埋戻し部との間に充填する、請求項6に記載のコンクリート基礎構造の施工方法。
- 前記工程(c)では、前記埋戻し部を転圧する、請求項6に記載のコンクリート基礎構造の施工方法。
- 前記工程(e)では、上下方向に延びる雄ねじ部と前記雄ねじ部に螺合された雌ねじ部とを有する高さ調整具を前記プレキャストコンクリート基礎の側面に取り付け、前記雄ねじ部を回転させて、前記雄ねじ部の前記プレキャストコンクリート基礎から下方に突出した部分の長さを調整することによって、前記プレキャストコンクリート基礎の高さを調整する、請求項6に記載のコンクリート基礎構造の施工方法。
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CN201980028990.0A CN112074640B (zh) | 2019-04-02 | 2019-12-17 | 混凝土基础构造及其施工方法 |
US16/644,551 US11047103B2 (en) | 2019-04-02 | 2019-12-17 | Concrete foundation structure and method for constructing same |
AU2019439273A AU2019439273B2 (en) | 2019-04-02 | 2019-12-17 | Concrete foundation structure and construction method for same |
KR1020207031237A KR102275957B1 (ko) | 2019-04-02 | 2019-12-17 | 콘크리트 기초 구조 및 그 시공 방법 |
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IT202100015353A1 (it) * | 2021-06-11 | 2022-12-11 | Metallurgica Ledrense Soc Cooperativa | Struttura di fondazioni per costruzioni e relativi elementi di connessione meccanica |
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