JP4758803B2 - Foundation structure with anchor bolt and its construction method - Google Patents

Description

  The present invention relates to a foundation structure with anchor bolts and a construction method thereof.

Conventionally, in a foundation structure of a building such as a house, a lower portion of an anchor bolt is embedded and fixed to an upper end portion of a concrete foundation, and the anchor bolt protrudes from the upper surface of the concrete foundation.
Patent Document 1 discloses a method in which a reinforcing plate is screwed to an intermediate portion of an anchor bolt, and this reinforcing plate is embedded and fixed to an upper end portion of a concrete foundation. According to this, even if a horizontal external force acts on the anchor bolt, this external force is not input directly from the anchor bolt portion to the concrete foundation but is distributed and input via the reinforcing plate. It is possible to prevent the corner portion corresponding to the anchor bolt of the foundation from being destroyed.
JP2002-88775

The foundation structure with anchor bolts of Patent Document 1 has the following disadvantages.
(1) The anchor plate is held at the upper part between the opposing molds, and the reinforcing plate is fixed to the anchor bolts held on the anchor plate. The upper and lower levels cannot be adjusted. This is because the reinforcing plate is screwed and fixed to the anchor bolt, so that when the reinforcing plate and the anchor bolt are relatively screwed to adjust the level of the reinforcing bolt, the reinforcing plate is attached to the formwork. On the other hand, the anchor bolt rotates relative to the mold on the other hand, and as a result, the anchor bolt hook to be set at a predetermined position in the foundation is eccentric from the predetermined position. And it is not valid.

  (2) Immediately before installing the building on the foundation, the anchor plate covering the concrete around the anchor bolts is used to correct the position of the anchor bolts. It is screwed to the anchor bolt and cannot be removed from the anchor bolt. Therefore, the reinforcing plate cannot be peeled off from the upper part of the concrete foundation, and the position of the anchor bolt cannot be corrected.

  An object of the present invention is to make it possible to adjust the upper and lower levels of the reinforcing plate in the stage before pouring the ready-mixed concrete between the molds in the foundation structure with anchor bolts in which the reinforcing plate is embedded and fixed to the upper part. The object is to make it possible to correct the position of the anchor bolt immediately before installation.

According to a first aspect of the present invention, there is provided a foundation structure including an anchor bolt in which a lower portion of an anchor bolt is embedded and fixed to an upper end portion of a concrete foundation, and the anchor bolt protrudes from an upper surface of the concrete foundation. loosely inserted reinforcing plate to the middle portion, and wherein the upper and lower nuts screwed to the anchor bolts sandwiching the reinforcing plate, it is embedded fixing the reinforcing plate on top of the concrete foundation, the reinforcing plate, the anchor A horizontal plate portion in which a bolt is loosely inserted and embedded in the upper portion of the concrete foundation, and side plates on both sides which are protruded downward at both ends of the horizontal plate portion and are embedded and engaged with both side surfaces of the concrete foundation. It has a part .

According to the second aspect of the present invention, an anchor plate is held at an upper portion between opposing molds, and an anchor bolt extending vertically is held on the anchor plate. In the construction method of the foundation structure with anchor bolts, which is poured until the lower part is immersed and then the ready-mixed concrete is hardened and the formwork is removed, the horizontal plate in which the anchor bolts are loosely inserted and embedded in the upper part of the concrete foundation And a reinforcing plate having both side plate portions projecting downward at both ends of the horizontal plate portion and being embedded and engaged with both side surfaces of the concrete foundation, and positioned below the anchor plate The horizontal plate portion of the reinforcing plate is loosely inserted into the middle portion of the anchor bolt and screwed to the anchor bolt. The upper and lower nuts sandwiching the horizontal plate portion of the reinforcing plate, in which so as to cure satisfies the raw concrete to a portion of the horizontal plate portion and the side of the side plate portion of the reinforcing plate.

(a) The anchor plate is held at the upper part between the opposing molds, and the reinforcing plate is fixed to the anchor bolts held on the anchor plate, and before the ready-mixed concrete is poured between the molds, The vertical level can be adjusted. This is because the reinforcing plate is loosely inserted into the anchor bolt and is fixed by being sandwiched by the upper and lower nuts, so that if the upper and lower nuts are loosened, the reinforcing plate can be translated along the mold to adjust the level. . Since the anchor bolt translates along the formwork and does not rotate with respect to the formwork, the hook does not deviate from a predetermined position in the foundation and is not decentered. Can be set.

  (b) Immediately before installation of the building on the foundation, in order to correct the position of the anchor bolt, when trying to cut a part of the concrete around the anchor bolt, there is a reinforcing plate covering the concrete around the anchor bolt. Since it is loosely inserted into the anchor bolt and is not screwed or the like, the reinforcing plate can be removed from the anchor bolt. Therefore, the position of the anchor bolt can be corrected by peeling the reinforcing plate from the upper part of the concrete foundation.

(c) 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 on the opposite side 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 avoided that the corner corresponding to the anchor bolt of the concrete foundation is broken by this input.

(d) As described in (a ) above, the upper and lower levels of the reinforcing plate can be adjusted before the ready-mixed concrete is poured between the molds, and the reinforcing plate can be easily and reliably embedded and fixed on the upper part of the concrete foundation.

  1 is a sectional view showing a foundation structure with anchor bolts, FIG. 2 is a schematic perspective view showing a foundation structure with anchor bolts, FIG. 3 is a sectional view showing an example in which a building structure is installed on the foundation structure with anchor bolts, and FIG. Is a cross-sectional view showing a state where the anchor plate is set on the mold, FIG. 5 is a front view showing a state where the reinforcing plate is attached to the anchor bolt, and FIG. 6 is a cross-sectional view showing a state where the anchor bolt is set on the anchor plate. FIG. 7 is a cross-sectional view showing the level adjustment state of the reinforcing plate, and FIG.

  In FIG. 1, a foundation groove 21 that extends along a building is formed on the ground 20, and a split chestnut layer 22 is formed by adding the chestnut to the bottom of the foundation groove 21. 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. A lower portion of the anchor bolt 25 is embedded and fixed at the upper end portion of the concrete foundation 24, and the upper end portion of the anchor bolt 25 is protruded from the upper surface of the concrete foundation 24. 1 and 2, the anchor bolt 25 is arranged so as to be shifted from the center of the width direction of the concrete foundation 24 to the right side. Therefore, when the right corner 24a acts on the anchor bolt 25 from the direction of the arrow B, When an external force is directly input from the anchor bolt 25 to the concrete foundation 24, the corner portion 24a tends to be easily broken by the external force received from the anchor bolt 25.

  However, as shown in FIGS. 1 and 2, a reinforcing plate 26 is embedded and fixed to the upper end portion of the concrete foundation 24 in correspondence with the anchor bolt 25. At this time, a reinforcing plate 26 is loosely inserted into the anchor bolt 25, and upper and lower nuts 27a and 27b, which will be described in detail later, are screwed, and the lower nut 27b is embedded in the concrete foundation 24 on the lower surface side of the reinforcing plate 26. The

The reinforcing plate 26 has a horizontal plate portion 26a embedded in the upper portion of the concrete foundation 24, and side plate portions 26b and 26c protruding downward at each of the left end and the right end of the horizontal plate portion 26a . The side plate portion 26 b is embedded and engaged with the side portion of the upper end portion of the concrete foundation 24 on the side surface 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 26 a is formed flush with the upper surface of the concrete foundation 24, and the outer surfaces of the side plate portions 26 b and 26 c are formed flush with the side surface of the concrete foundation 24. A metal plate can be used for the reinforcing plate 26. In this case, a material that does not chemically react with components contained in concrete or the like is used. The reinforcing plate 26 may be made of a synthetic resin material other than metal or other materials. In short, 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 input to the concrete foundation 24 to cause partial damage. If it can prevent.

  The horizontal plate portion 26a has a bolt insertion hole 28 and a confirmation hole 29 into which the anchor bolt 25 is loosely inserted.

  In such a structure, when a horizontal external force acts on the anchor bolt 25 from the direction of the arrow B, the external force is not input directly from the anchor bolt 25 portion to the concrete foundation 24 but is distributed and input via the reinforcing plate 26. Will be. At this time, the external force acting on the anchor bolt 25 is input to the concrete foundation 25 via the side plate portion 26b on the side 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 the arrow B, it is avoided that the corner portion 24a corresponding to the anchor bolt 25 of the concrete foundation 24 is broken by this input. Thus, it is possible to prevent the corner portion 24a corresponding to the anchor bolt 25 of the concrete foundation 24 from being broken.

  The floor beam 1 of the building structure installed on the upper surface of the concrete foundation 24 is inserted into the anchor bolt 25 protruding from the upper surface of the concrete foundation 24 and screwed to the anchor bolt 25 as shown in FIG. Fastened to the concrete foundation 24 by the nut 27A.

Hereinafter, the construction procedure of the concrete foundation 24 will be described.
(1) As shown in FIG. 4, a foundation groove 21 is formed on the ground 20 along the building, and the split chestnut layer 22 is formed by throwing the split chestnut into the bottom of the foundation groove 21 to form the split chestnut layer 22. A footing layer 23 in which concrete is struck is formed. Next, the molds 30 and 30 are arranged on the footing layer 23 so as to face each other and spaced apart from each other, and the molds 30 and 30 are supported on the ground 20 by a support member (not shown). A spacer 31 is arranged at the top end of the mold 30.

  (2) Both ends of the anchor plate 32 are placed on the spacers 31 on the molds 30, 30, and the anchor plates 32 are held on the mold 30 together with the spacers 31 by the lifting prevention metal fittings 33.

  (3) As shown in FIG. 5, the bolt insertion hole 28 of the reinforcing plate 26 is loosely inserted in the middle portion of the anchor bolt 25, and the reinforcing plate 26 is sandwiched between the upper and lower nuts 27a and 27b screwed to the anchor bolt 25. The reinforcing plate 26 is attached to the bolt 25. The neck length of the anchor bolt 25 with respect to the reinforcing plate 26 is set to a certain length.

  (4) As shown in FIG. 6, the upper end portion of the anchor bolt 25 to which the reinforcing plate 26 is attached is loosely inserted into the anchor plate 32, and the anchor plate 32 is attached by two nuts 34a and 34b screwed to the anchor bolt 25. The anchor bolts 25 are held by the anchor plate 32. The hook 25a of the anchor bolt 25 is set at a substantially central portion of the interval between the opposing molds 30 and 30 so that the hook 25a of the anchor bolt 25 can be set at the central portion of the thickness which is a predetermined position inside the concrete foundation 24.

  (5) Adjust the upper and lower levels of the reinforcing plate 26 as necessary. As shown in FIG. 7, by loosening the upper and lower nuts 27a and 27b screwed to the anchor bolt 25, the reinforcing plate 26 is placed on the inner surface of the mold 30 within a range L between the upper and lower nuts 27a and 27b. The level can be adjusted by parallel translation.

  (6) Pour the ready-mixed concrete 34 between the molds 30 and 30 as shown in FIG. At this time, the ready-mixed concrete 34 is poured until the lower part of the anchor bolt 25 is immersed, and the ready-mixed concrete 34 is filled up to the reinforcing plate 26. Moreover, at this time, it is confirmed that the ready-mixed concrete 34 has started to overflow upward from the concrete confirmation hole 29, and the pouring of ready-mixed concrete is stopped at this position. By doing in this way, the pouring height of the ready-mixed concrete 34 can be easily confirmed using the reinforcing plate 26 as a guide. At this time, the lower nut 27 b is embedded in the ready-mixed concrete on the lower surface side of the reinforcing plate 26.

  (7) After the ready-mixed concrete 34 is hardened, the foundation 30 in which the anchor bolts 25 and the reinforcing plate 26 are attached to the concrete foundation 24 by embedding around the concrete foundation 24 formed by removing the molds 30, 30. The construction is completed, and the basic structure as shown in FIG. 1 is obtained.

According to the present embodiment, the following operational effects can be obtained.
(a) The anchor plate 32 is held at the upper part between the opposing molds 30, and the ready-mixed concrete 34 is poured between the molds 30 in a state where the reinforcing plate 26 is fixed to the anchor bolts 25 held on the anchor plate 32. In the previous stage, the upper and lower levels of the reinforcing plate 26 can be adjusted. This is because the reinforcing plate 26 is loosely inserted into the anchor bolt 25 and is sandwiched and fixed between the upper and lower nuts 27a and 27b. The level can be adjusted by being translated along Since the anchor bolt 25 translates along the mold 30 and does not rotate with respect to the mold 30, the hook 25a is not deviated from a predetermined position in the foundation 24, and the hook 25a is It can be set at a predetermined position in the foundation 24.

  (b) Immediately before the building is installed on the foundation 24, when the concrete around the anchor bolt 25 is to be partially cut in order to correct the position of the anchor bolt 25, the concrete is covered around the anchor bolt 25. Since the reinforcing plate 26 is loosely inserted into the anchor bolt 25 and is not screwed or the like, the reinforcing plate 26 can be removed from the anchor bolt 25. Therefore, the reinforcing plate 26 can be peeled off from the upper part of the concrete foundation 24, and the position of the anchor bolt 25 can be corrected.

  (c) The external force acting on the anchor bolt 25 is not directly inputted from the anchor bolt 25 to the concrete foundation 24 but is received by the side plate portion on the opposite side 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, it is avoided that the corner portion 24a corresponding to the anchor bolt 25 of the concrete foundation 24 is broken by this input.

  (d) As described in (a) above, the upper and lower levels of the reinforcing plate 26 can be adjusted before the ready-mixed concrete 34 is poured between the molds 30, and the reinforcing plate 26 is easily and reliably embedded in the upper portion of the concrete foundation 24. Can be fixed.

  The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration of the present invention is not limited to this embodiment, and even if there is a design change or the like without departing from the gist of the present invention. It is included in the present invention.

FIG. 1 is a cross-sectional view showing a foundation structure with anchor bolts. FIG. 2 is a schematic perspective view showing a foundation structure with anchor bolts. FIG. 3 is a cross-sectional view showing an example in which a building structure is installed on a foundation structure with anchor bolts. FIG. 4 is a cross-sectional view showing a state in which the anchor plate is set on the mold. FIG. 5 is a front view showing a state in which the reinforcing plate is attached to the anchor bolt. FIG. 6 is a cross-sectional view showing a state in which the anchor bolt is set on the anchor plate. FIG. 7 is a cross-sectional view showing a level adjustment state of the reinforcing plate. FIG. 8 is a cross-sectional view showing a state in which ready-mixed concrete is poured.

Explanation of symbols

24 Concrete Foundation 25 Anchor Bolt 26 Reinforcement Plate 26a Horizontal Plate 26b , 26c Side Plate 27a, 27b Nut 30 Mold 32 Anchor Plate

Claims (2)

In a foundation structure including an anchor bolt in which a lower portion of an anchor bolt is embedded and fixed to an upper end portion of a concrete foundation, and the anchor bolt protrudes from an upper surface of the concrete foundation,
A reinforcing plate is loosely inserted in an intermediate part of the anchor bolt, and the reinforcing plate is sandwiched between upper and lower nuts screwed to the anchor bolt, and the reinforcing plate is embedded and fixed to the upper part of the concrete foundation .
The reinforcing plate is provided with a horizontal plate portion in which the anchor bolt is loosely inserted and embedded in the upper portion of the concrete foundation, and projects downwardly at both ends of the horizontal plate portion. A foundation structure with anchor bolts, characterized by having side plate portions on both sides that are embedded and engaged . While holding the anchor plate at the upper part between the opposing molds and holding the anchor bolts extending vertically on the anchor plate, the concrete was poured between the molds until the lower part of the anchor bolts was immersed. After, in the construction method of the foundation structure with anchor bolts to remove the formwork by curing the ready-mixed concrete,
The anchor bolt is loosely inserted and protruded downward at each of the horizontal plate portion embedded in the upper portion of the concrete foundation and both ends of the horizontal plate portion, and is embedded and engaged with both side surfaces of the concrete foundation. Reinforcing plates with side plate parts on both sides
The horizontal plate portion of the reinforcing plate positioned below the anchor plate is loosely inserted into the middle portion of the anchor bolt, and the horizontal plate portion of the reinforcing plate is sandwiched between upper and lower nuts screwed to the anchor bolt, and A method for constructing a foundation structure with anchor bolts, wherein concrete is filled and hardened up to a horizontal plate portion and side plate portions on both sides of the reinforcing plate.

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