JP2002088775A - Foundation structure equipped with anchor bolt and method for constructing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a foundation structure equipped with an anchor bolt, which can prevent breakage of a corner portion of a concrete foundation corresponding to the anchor bolt by a horizontal external force even if the force acts on the anchor bolt. SOLUTION: The foundation structure equipped with the anchor bolt is constructed by rigidly burying a lower portion of the anchor bolt 25 in an upper end of the concrete foundation 24, and protruding the anchor bolt 25 from an upper surface of the concrete foundation 24. According to the foundation structure thus constructed, a reinforcing plate 26 through which the anchor bolt 25 has penetrated, is rigidly buried in an upper portion of the concrete foundation 24. The method for constructing the concrete foundation equipped with the anchor bolt is also provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a foundation structure with anchor bolts having an anchor bolt protruding from an upper surface of a concrete foundation of a building such as a house, and a method of constructing the same.

[0002]

2. Description of the Related Art When constructing this type of foundation structure with anchor bolts, for example, first, as shown in FIG.
The base groove 2 is formed along the building, and the chestnut layer 3 is formed by pouring split chestnut into the bottom of the base groove 2 to form a split chestnut layer 3.
Pour concrete on top and split footing layer 3 on split chestnut layer 3
Is provided, the facing mold 5 on the footing layer 4 is provided.
5 is disposed, and the molds 5 and 5 are supported by the support members 6 and 6. Next, both ends of the anchor plate 7 are held at the upper ends of the molds 5, 5, and the anchor bolts 8 that extend vertically are held by the anchor plate 7. In this state, formwork 5,
After the ready-mixed concrete 9 is poured into the lower portion of the anchor bolt 8 until the lower part of the anchor bolt 8 is immersed, the ready-mixed concrete 9 is hardened, the molds 5 and 5 are removed, and the soil is laid.
The construction of the foundation structure in which the anchor bolts 8 are erected and fixed on the concrete 10 is completed as shown in FIG.
-28275).

[0003]

By the way, in such a foundation structure, when an external force acts on the anchor bolt 8 in the direction of arrow A, the external force is directly input from the anchor bolt 8 to the concrete foundation. 8
In this portion, a shearing force acts on the concrete foundation 10 in the direction indicated by the alternate long and short dash line 11, and the corners 10a may be broken as shown in FIG.

[0004] Therefore, in order to prevent such breakage, it is necessary to increase the concrete strength, increase the thickness of the concrete foundation 10, or reinforce it with reinforcing steel.

However, in this case, the cost for constructing the concrete foundation 10 increases. In order to increase the strength of the concrete foundation 10, it is sufficient to reduce the water content of the ready-mixed concrete. However, when the water content is reduced, the fluidity of the ready-mixed concrete is reduced. Since the fluidity also decreases, poor filling of the concrete is likely to occur, and it is difficult to secure cover (the thickness of the concrete covering the reinforcing steel).

Accordingly, the present invention provides a foundation structure with an anchor bolt capable of preventing a corner portion corresponding to the anchor bolt of a concrete foundation from being broken even if a horizontal external force acts on the anchor bolt. And an execution method thereof.

[0007]

In order to achieve the above object, according to the first aspect of the present invention, there is provided a foundation structure with an anchor bolt, wherein a lower portion of the anchor bolt is embedded and fixed to an upper end of a concrete foundation, and In a foundation structure having anchor bolts protruding from the upper surface of a concrete foundation, a reinforcing plate having the anchor bolts penetrated is embedded and fixed on an upper portion of the concrete foundation. According to this configuration, even when an external force in the horizontal direction acts on the anchor bolt, the external force is not directly input from the anchor bolt portion to the concrete foundation but is dispersed and input via the reinforcing plate. This can prevent the corners corresponding to the anchor bolts of the concrete foundation from being destroyed.

[0008] Further, according to a second aspect of the present invention, there is provided a foundation structure with an anchor bolt according to the first aspect, wherein the reinforcing plate comprises:
A horizontal plate portion through which the anchor bolt penetrates and is buried in the upper part of the concrete foundation; and a side plate protruding downward from the horizontal plate portion and buried in a side surface opposite to a direction in which an external force acts on the anchor bolt. Since the configuration has the side plate portion to be engaged, the external force acting on the anchor bolt is not directly input from the anchor bolt to the concrete foundation, but is received by the side plate portion opposite to the direction in which the external force acts. As a result, even if a large external force is input to the anchor bolt, it is possible to prevent the corner corresponding to the anchor bolt of the concrete foundation from being broken by the input.

Further, according to a third aspect of the present invention, there is provided the method of constructing a foundation structure with anchor bolts, wherein the anchor plate is held above the opposing formwork and the anchor plate holds vertically extending anchor bolts. In the method of constructing a foundation structure with anchor bolts by pouring ready-mixed concrete between the formwork until the lower part of the anchor bolt is immersed, then hardening the ready-mixed concrete and removing the formwork, The reinforcing plate positioned below the plate is held at the intermediate portion of the anchor bolt, and the ready-mixed concrete is filled up to the reinforcing plate and hardened, so that the reinforcing plate can be easily attached to the upper end of the concrete foundation. Can be buried in

According to a fourth aspect of the present invention, in the method for constructing a foundation structure with anchor bolts according to the third aspect, a concrete confirmation hole is provided in the reinforcing plate, and the fresh concrete is filled up to the portion of the reinforcing plate. Since the pouring of the ready-mixed concrete is sometimes stopped at a position where the ready-mixed concrete overflows from the concrete confirmation hole, the pouring height of the ready-mixed concrete can be easily confirmed using the reinforcing plate as a guide.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to FIGS.

In FIG. 1 (a), a foundation groove 21 is formed along the building on the ground 20, and a split chestnut layer 22 formed by pouring chestnut into the bottom of the foundation groove 21 is formed. . A footing layer 23 formed by hitting concrete is formed on the split chestnut layer 22, and a concrete foundation 24 is formed on the footing layer 23. The lower part of the anchor bolt 25 is embedded and fixed to the upper end of the concrete foundation 24, and the upper end of the anchor bolt 25 projects from the upper surface of the concrete foundation 24. 1 (a) and 1 (b), since the anchor bolt 25 is displaced to the left from the center in the width direction of the concrete foundation 24, external force is applied to the anchor bolt 25 in the direction of arrow B by the left corner 24a. When an external force is directly input to the concrete foundation 24 from the anchor bolt 25 when acting from the angle, the corner 24a tends to be easily broken by the external force received from the anchor bolt 25.

However, at the upper end of the concrete foundation 24, as shown in FIG. 1, a reinforcing plate 26 corresponding to the anchor bolt 25 is embedded and fixed. The reinforcing plate 26 has a horizontal plate 26a buried at the upper end of the concrete foundation 24 and a thick side plate 26b protruding downward at one end of the horizontal plate 26a (FIG. 2, FIG. 2).
(See FIG. 3). The side plate 26b is buried and engaged with the side of the upper end of the concrete foundation 24 on the side opposite to the direction in which the external force indicated by the arrow B acts on the anchor bolt. The upper surface of the horizontal plate portion 26a is formed flush with the upper surface of the concrete foundation 24, and the outer surface of the side plate portion 26b is formed flush with the side surface of the concrete foundation 24. The side plate portion 26b is located inside the concrete foundation 24. A metal plate can be used as the reinforcing plate 26. In this case, a material that does not chemically react with components contained in concrete or the like is used. In addition, a synthetic resin material other than metal or another material can be used for the reinforcing plate 26.
The point is that the external force acting on the anchor bolt B is directly input from the anchor bolt 24 to the concrete foundation 24 and does not act locally, and this external force is dispersed and the concrete foundation 24 is partially damaged and input to the concrete foundation 24. It is good if it can be prevented.

A screw hole 27 and a confirmation hole 28 are formed in the horizontal plate portion 26a. The screw portion 25a of the anchor bolt 25 is screwed into the screw hole 27 and penetrates upward.

Next, the operation of the basic structure having such a structure will be described.

In such a structure, when a horizontal external force acts on the anchor bolt 25 from the direction of arrow B, the external force is not directly input from the anchor bolt 25 to the concrete foundation 24 but is dispersed via the reinforcing plate 26. Will be entered. At this time, the external force acting on the anchor bolt 25 is input to the concrete foundation 25 via the side plate 26b opposite to the direction in which the external force acts. As a result, even if a large external force is input to the anchor bolt 25 from the direction of arrow B, the input causes the corner portion 24a corresponding to the anchor bolt 25 of the concrete foundation 24 to be input.
Is prevented from being destroyed. In this manner, the corners 24a of the concrete foundation 24 corresponding to the anchor bolts 25 can be prevented from being destroyed.

[0017]

[Embodiment 2] Next, a method of constructing such a foundation structure will be described.

First, a foundation groove 2 on the ground 20 along the building
1 is formed, and split chestnuts are put into the bottom of the base groove 21 and crushed to form a split chestnut layer 22, and a footing layer 23 made of concrete is formed on the split chestnut layer 22. Next, the molds 29, 29 are arranged on the footing layer 23 so as to face each other and at an interval, and the molds 29, 29 are supported on the ground 20 by a support member (not shown).

On the other hand, the screw portion 25a of the anchor bolt 25
Is screwed into the screw hole 27, and the screw portion 25a is
5A, the reinforcing plate 26 is held (attached) to the anchor bolt 25 by projecting upward as shown in FIG. Then, as shown in FIG. 6, after the fixing nut 30 is screwed to the screw portion 25a, the screw portion 25a is
a into the insertion hole (not shown) of the anchor plate 31, and the fixing nut 32 is further screwed to the screw portion 25 a, so that the anchor plate 3 is fixed between the fixing nuts 30 and 32.
Hold 1 Thus, the anchor plate 31 holding the anchor bolt 24 and the reinforcing plate 26 is prepared.

Next, as shown in FIG. 4, the anchor bolt 24 and the reinforcing plate 26 held by the anchor plate 31 are inserted and arranged between the mold frames 29, 29, and
Both ends of the anchor plate 31 are fixed to upper ends of the molds 29, 29 with bolts (not shown). At this time, the side plate 26b of the reinforcing plate 26 is inscribed in one of the molds 29,29. In this state, the fixing nuts 30 and 32 are loosened, the vertical position of the fixing nut 30 is adjusted, the anchor bolt 25 is rotated, and the height of the reinforcing plate 26 is adjusted. Tighten and fix the plate.

Thereafter, ready-mixed concrete 33 is poured between the molds 29, 29 as shown in FIG. At this time, the ready-mixed concrete 33 is poured until the lower portion of the anchor bolt 25 is immersed, and the ready-mixed concrete 33 is filled up to the reinforcing plate 26. In addition, at this time, it is confirmed that the fresh concrete 33 has begun to overflow from the concrete confirmation hole 28, and the pouring of the ready-mixed concrete is stopped at this position. By doing so, the reinforcing plate 26
As a guide, the pouring height of the ready-mixed concrete 33 can be easily confirmed.

After the ready-mixed concrete 33 has hardened, the anchors 25 and the reinforcing plates 26 are attached to the concrete foundation 24 by removing the formwork 29, 29 and embedding the concrete foundation 24 around the concrete foundation 24. The construction of the foundation structure is completed, and the foundation structure as shown in FIG. 1 is obtained.

[0023]

According to the first aspect of the present invention, there is provided a foundation structure with an anchor bolt, wherein a lower portion of the anchor bolt is embedded and fixed to an upper end portion of the concrete foundation, and the anchor bolt projects from an upper surface of the concrete foundation. Wherein the reinforcing plate having the anchor bolts penetrated therein is embedded and fixed on the upper part of the concrete foundation. According to this configuration, even when an external force in the horizontal direction acts on the anchor bolt, the external force is not directly input from the anchor bolt portion to the concrete foundation but is dispersed and input via the reinforcing plate. This can prevent the corners corresponding to the anchor bolts of the concrete foundation from being destroyed.

According to a second aspect of the present invention, there is provided a foundation structure with an anchor bolt according to the first aspect, wherein the reinforcing plate comprises:
A horizontal plate portion through which the anchor bolt penetrates and is buried in the upper part of the concrete foundation; and a side plate protruding downward from the horizontal plate portion and buried in a side surface opposite to a direction in which an external force acts on the anchor bolt. Since the configuration has the side plate portion to be engaged, the external force acting on the anchor bolt is not directly input from the anchor bolt to the concrete foundation, but is received by the side plate portion opposite to the direction in which the external force acts. As a result, even if a large external force is input to the anchor bolt, it is possible to prevent the corner corresponding to the anchor bolt of the concrete foundation from being broken by the input.

Further, in the construction method of a foundation structure with an anchor bolt according to the third aspect of the present invention, the anchor plate is held above the opposing formwork and the anchor plate holds the vertically extending anchor bolt. In the method of constructing a foundation structure with anchor bolts by pouring ready-mixed concrete between the formwork until the lower part of the anchor bolt is immersed, then curing the ready-mixed concrete and removing the formwork, The reinforcing plate positioned below the plate is held at the intermediate portion of the anchor bolt, and the ready-mixed concrete is filled up to the reinforcing plate and hardened, so that the reinforcing plate can be easily attached to the upper end of the concrete foundation. Can be buried in

According to a fourth aspect of the present invention, in the method for constructing a foundation structure with anchor bolts according to the third aspect, a concrete confirmation hole is provided in the reinforcing plate, and the fresh concrete is filled up to the portion of the reinforcing plate. Since the pouring of the ready-mixed concrete is sometimes stopped at a position where the ready-mixed concrete overflows from the concrete confirmation hole, the pouring height of the ready-mixed concrete can be easily confirmed using the reinforcing plate as a guide.

[Brief description of the drawings]

FIG. 1A is a sectional view of a foundation structure with anchor bolts according to the present invention, and FIG. 1B is a perspective view of a concrete foundation of FIG.

FIG. 2 is a plan view of a reinforcing plate shown in FIGS. 1 (a) and 1 (b).

FIG. 3 is a side view of the reinforcing plate shown in FIGS. 1 (a) and 1 (b).

FIG. 4 is a cross-sectional view in which a reinforcing plate with anchor bolts according to the present invention is assembled to a mold.

FIG. 5 is a side view showing a relationship between the anchor bolt and the reinforcing plate of FIG. 4;

FIG. 6 is a side view in which an anchor plate is attached to the anchor bolt of FIG. 5;

FIG. 7 is a cross-sectional view of a state in which ready-mixed concrete is poured between the molds of FIG.

FIG. 8 is a sectional view of a conventional method for constructing a foundation structure with anchor bolts.

FIG. 9 is a cross-sectional view in which the mold of FIG.

FIG. 10 is a sectional view for explaining the operation of the concrete foundation of FIG. 8;

[Description of Signs] 24 ・ ・ ・ Concrete Foundation 25 ・ ・ ・ Anchor Bolt 26 ・ ・ ・ Reinforcement Plate 26a ・ ・ ・ Horizontal Plate 26b ・ ・ ・ Side Plate 28 ・ ・ ・ Concrete Confirmation Hole 29 ・ ・ ・ Form

Continued on the front page F term (reference) 2D046 AA03 BA00 BA11 2E125 AA02 AA45 AB12 AB13 AC04 AC14 AC18 AG03 AG52 BA04 BA22 BB02 BB22 BB24 BB27 BD01 BD03 BE07 BE08 BF01 CA05 CA13 EA00 EA11 EB12

Claims (4)

[Claims] 1. A foundation structure having an anchor bolt buried and fixed to an upper end portion of a concrete foundation, the anchor bolt protruding from an upper surface of the concrete foundation, wherein the anchor bolt is penetrated. A foundation structure with anchor bolts, characterized in that a reinforcing plate is embedded and fixed above the concrete foundation. 2. The reinforcing plate has a horizontal plate portion penetrated by the anchor bolt and buried in the upper portion of the concrete foundation, and a reinforcing plate protruded downward from the horizontal plate portion, and an external force is applied to the anchor bolt. The base structure with an anchor bolt according to claim 1, further comprising a side plate portion buried and engaged on a side surface opposite to a working direction. 3. An anchor plate is held at an upper portion between opposing molds, and in a state where an anchor bolt extending up and down is held by the anchor plate, ready-mixed concrete is placed between the molds and a lower portion of the anchor bolts. After pouring until immersed, in the construction method of the foundation structure with anchor bolts by hardening the ready-mixed concrete and removing the formwork, a reinforcing plate located below the anchor plate is placed in the middle part of the anchor bolt A method of constructing a foundation structure with anchor bolts, wherein the foundation is held and at the same time, the ready-mixed concrete is filled up to the reinforcing plate and hardened. 4. A concrete confirmation hole is provided in the reinforcing plate, and when the ready-mixed concrete is filled up to the portion of the reinforcing plate, pouring of the ready-mixed concrete is stopped at a position where the ready-mixed concrete overflows from the concrete confirmation hole. The method for constructing a foundation structure with anchor bolts according to claim 3, wherein: