JP3749287B2 - Concrete foundation construction method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
TECHNICAL FIELD The present invention relates to a method for constructing a foundation for an exposed fixed column base, and in particular, a concrete in which a column base and a base beam having different top end levels can be integrally formed by a single concrete placement. It relates to the construction method of the foundation.
[0002]
[Prior art]
In concrete foundations of steel structure buildings that use steel columns such as steel pipes, the column bases with embedded anchor bolts are arranged corresponding to the installation positions of the columns, and the column bases and the foundations are arranged. In general, the foundation beam portion to be connected is integrally formed.
[0003]
In particular, in a frame having a ramen structure, the thickness of the column increases, and the size of the column base increases accordingly. When building a building by attaching a floor slab or outer wall slab made of concrete panel such as ALC panel or PC panel to such a frame, if the top level of the column base is equal to the base beam, It is necessary to form a notch in the corner of the panel corresponding to the part, which may increase the construction period and increase the cost. Also, if the column base is held in an exposed state, the anchor bolts will rust or impair the appearance performance, so it is common to embed the column base in concrete. There is a problem that the appearance performance is deteriorated after becoming higher than the top end level of the part.
[0004]
For this reason, by setting the top level of the column base to be lower than the top level of the foundation beam, the column base is positioned below the installation level of the floor slab and outer wall plate, so that the corner of the panel In addition to avoiding the formation of notches in the corners, when the column base is embedded in concrete, the top level of the column base and the top level of the foundation beam are set to the same level, thereby generating anchor bolts. It is common to prevent rust and maintain appearance performance.
[0005]
When constructing the above concrete foundation, place the formwork according to the floor plan of the column base and foundation beam, and place the concrete on this formwork, and the top end level is the same as the top end level of the column base The purpose of this is to construct the column base and foundation beam in one piece, and then adjust the installation level to fix the column to the column base and further adjust the installation level of the floor slab and outer wall slab Concrete or mortar is again placed on the foundation beam portion, or concrete is again placed on the column base portion and the foundation beam portion for the purpose of integrating the column with the foundation.
[0006]
[Problems to be solved by the invention]
In the above conventional construction method, once the column bases and foundation beam parts at the same level are once integrated, a foundation beam part having a different level or a column beam part embedded with the column bases is formed again. Therefore, it is necessary to strike concrete or mortar twice. For this reason, the problem that a construction period becomes long generate | occur | produces.
[0007]
The objective of this invention is providing the construction method of the concrete foundation which can comprise integrally the column base part and foundation beam part from which a top end level differs by once placing concrete.
[0008]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, a concrete foundation construction method according to the present invention is a concrete foundation construction method comprising a column base portion and a foundation beam portion from which anchor bolts protrude, and the top end of the column base portion. A side wall of a concrete foundation having a portion corresponding to a column base having a height substantially equal to the level and a portion corresponding to a foundation beam having a top level higher than the top level of the column base. A portion corresponding to the column base from the upper end of the portion corresponding to the base beam portion in the side wall forming portion provided at a position corresponding to the longitudinal end portion of the base beam portion. A mold having a partition plate reaching the upper end is arranged and an anchor bolt is arranged at a predetermined position of the column base, and then concrete is applied from above the mold other than the part corresponding to the column base of the mold. Place the partition It is characterized in that integrally formed a pedestal foundation and foundation beams of the low crest level than underlying beam portion partitioned by.
[0009]
The concrete foundation construction method has a side wall forming portion that forms the side wall of the concrete foundation, and has a predetermined depth from the upper end of the side wall forming portion at a position corresponding to the longitudinal end portion of the foundation beam portion. When the formwork provided with the partition plate is arranged according to the foundation plan and the anchor bolts are arranged at the position where the column base is formed, and then concrete is placed from above the formwork corresponding to the foundation beam, The installed concrete flows according to the formwork and fills the column base and the foundation beam. When the cast concrete reaches the top end level of the column base, the concrete is prevented from flowing toward the column base by the partition plate, and only the foundation beam is filled. Therefore, it is possible to integrally form the column base portion and the foundation beam portion having different top end levels by once placing the concrete.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a preferred embodiment of the concrete foundation construction method will be described with reference to the drawings. FIG. 1 is a perspective view for explaining the structure of a formwork when the construction method according to the present invention is carried out, FIG. 2 is a perspective view showing a state after placing concrete on the formwork, and FIG. 3 is a structure of a partition plate FIG. 4 is a perspective view for explaining the configuration of the integrally constructed column base and the foundation beam, and FIG. 5 is a mold used when the column base and the foundation beam are continuously constructed. It is a figure which shows the example of a frame.
[0011]
The concrete foundation construction method according to the present invention is to construct a column base and a base beam part having different top end levels by once placing concrete on a formwork arranged according to a foundation plan. This makes it possible to rationalize and shorten the construction period.
[0012]
Hereinafter, in order to avoid complication of explanation, the construction method will be described while explaining the configuration of the formwork of the joint portion between the column base and the base beam at the protruding corner shown in FIG. However, a T-shaped coupling portion having a column base and a cross-shaped coupling portion are substantially the same.
[0013]
In constructing the foundation, in accordance with the foundation plan in advance, the way of laying, root cutting, and groundwork are performed in advance, and then the foundation footing or the reinforcement of the slab / pressure board and the reinforcement of the foundation muscle are performed.
[0014]
After the predetermined bar arrangement as described above, the placement of the mold A or the anchor bolt 1 with respect to the formation position of the column base 5 is performed. Which of the mold A and the anchor bolt 1 is arranged first is not particularly limited, and may be set as appropriate according to the work environment and work procedure.
[0015]
The formwork A is provided on the side wall forming part 2 that forms the side wall of the concrete foundation composed of the foundation beam part 4 and the column base part 5 and the side wall forming part provided at a position corresponding to the longitudinal end of the foundation beam part 4. 2 and a partition plate 3 having a predetermined depth from the upper end.
[0016]
As shown in FIG.4 (b), when the foundation beam part 4 and the column base part 5 have the same width dimension, the side wall formation part 2 is comprised by the flat frame 2a formed with unit length. However, as shown in FIG. 5A, when the column base 5 has a width that is larger than that of the foundation beam 4, the side wall forming unit 2 includes the plate frame 2a, the foundation beam 4, and the column foundation. 5 is selected in accordance with the connection structure with the modified frame 2b to 2d shown in FIGS.
[0017]
As shown in FIG. 1, when the column base 5 forms a corner and the width of the foundation beam 4 is smaller than the width of the column base 5, it corresponds to the position of the foundation beam 4. A plurality of flat frame frames 2a are arranged to face each other, adjacent flat plate frames 2a are connected to each other to form a part of the side wall forming portion 2, and selected in advance according to the configuration position of the column base 5 The deformed frames 2b to 2d thus arranged are arranged according to the shape, and are connected to the adjacent deformed frames 2b to 2d and to the flat plate frame 2a.
[0018]
In the figure, the height of the odd-shaped frames 2b to 2d is formed to be lower than the height of the flat plate frame 2a. That is, when a jig for assuring the dimensional accuracy of the anchor bolt 1 arranged on the column base 5 is provided, or when a means for preventing the bolt 1 from falling is constituted, these jig or means It is preferable that the height of the odd-shaped frames 2b to 2d is made lower than that of the flat frame 2a in accordance with a dimension set in advance according to the above.
[0019]
The partition plate 3 is disposed at the end in the longitudinal direction of the foundation beam part 4, that is, at the boundary between the foundation beam part 4 and the column base part 5. As shown in FIG. 3, the partition plate 3 includes a partition member 3a having a depth set in advance corresponding to a difference between the top end levels of the foundation beam portion 4 and the column base portion 5, and the partition member 3a. A locking member 3b fixed to one end by means of welding or the like and locked to the upper end of the flat frame 2a, and the partitioning member 3a and the locking member 3b are connected to each other and act on the partitioning member 3a when placing concrete. And a reinforcing member 3c for preventing bending generated in the partition member 3a due to pressure.
[0020]
The partition plate 3 is disposed at a predetermined position which becomes a boundary between the foundation beam portion 4 and the column base portion 5, and a flange formed with a locking member 3b on the upper end side of the flat frame 2a by a vise-like fixing bracket 6. Fixed to.
[0021]
As described above, the formwork A is arranged according to the foundation plan, and the anchor bolt 1 is arranged at the position where the column base part 5 is formed, and then the concrete is applied only from above the formwork A corresponding to the foundation beam part 4. When placed, the placed concrete flows along the formwork A and fills the foundation beam portion 4 and the column base portion 5.
[0022]
After the concrete filling level in the formwork A rises and reaches the top end level of the column base 5, when the concrete is continuously placed, the concrete base beam 4 to the column base The flow to 5 is blocked by the partition plate 3, and only the foundation beam portion 4 is filled. Then, when the concrete filling level reaches the top end level of the foundation beam portion 4, by stopping the concrete placement on the formwork A, the foundation beam portion 4 and the column base portion 5 having different top end levels can be connected simultaneously. It is possible to configure.
[0023]
It is preferable that the concrete used when simultaneously constructing the foundation beam part 4 and the column base part 5 having different top end levels is manufactured in a JIS certified factory and adjusted in advance to a slump value of 15 cm to 18 cm. In the concrete adjusted to the slump value, after the concrete filled in the column base 5 reaches the top end level, the column will continue to be placed from above the formwork A corresponding to the foundation beam 4. Concrete does not overflow from the leg foundation 5.
[0024]
As described above, concrete is cast into the formwork A to form the base beam part 4 and the column base part 5 having different top end levels, and after the predetermined curing period has elapsed, the formwork A is removed. After the concrete foundation is exposed, as shown in FIGS. 4 (a) and 4 (b), the level of the column base 5 is adjusted and mortar or the like is placed on the top of the foundation 5 after the level plate 7 Is installed.
[0025]
Next, as shown in FIG. 2C, the base plate 8a of the steel column 8 is fixed to the anchor bolt 1, and the concrete or mortar is set so as to coincide with the top end level of the foundation beam portion 4 with respect to the column base portion 5. The column base portion of the steel column 8 composed of the anchor bolt 1 and the base plate 8a is embedded.
[0026]
Next, application points of the odd-shaped frames 2b to 2d will be briefly described with reference to FIGS. These deformed frames 2b to 2d are used as a part of the side wall forming part 2 that forms the side wall of the column base part 5 when the width of the column base part 5 is larger than the width of the base beam part 4. Is.
[0027]
The deformed frame 2b shown in FIG. 5A is used when forming a part of the outer side wall of the column base 5 at the protruding corner or the outer side wall of the T-shaped coupling portion. Is. As the deformed frame 2b, a frame having a shape shown in the figure and a frame having a shape different from this shape are prepared.
[0028]
The deformed frame 2c shown in FIG. 4B is used when forming a part of the outer side wall of the column base 5 at the protruding corner, and the above-described deformed frame 2b, which will be described later. Used together with the frame 2d.
[0029]
The deformed frame 2d shown in FIG. 2C is used when forming the inner side wall of the column base 5 at the protruding corner or the inner side wall of the T-shaped or cross-shaped coupling portion. It is used together with the above-described deformed frames 2b and 2c depending on the shape of the coupling portion.
[0030]
【The invention's effect】
As described in detail above, in the concrete foundation construction method according to the present invention, the portion corresponding to the column base having a height substantially equal to the top end level of the column base and the top of the column base. A side wall forming portion that forms a side wall of a concrete foundation having a portion corresponding to the foundation beam portion having a top end level higher than the level, and provided at a position corresponding to the longitudinal end portion of the foundation beam portion. In the side wall forming part, a formwork having a partition plate extending from the upper end of the part corresponding to the foundation beam part to the upper end of the part corresponding to the column base is arranged, and an anchor bolt is arranged at a predetermined position of the column base. However, by placing concrete from above the formwork other than the part corresponding to the column base, it is possible to simultaneously configure the column base and base beam at the top level lower than the base beam. . For this reason, the construction period required for the foundation work can be shortened and the cost can be reduced.
[Brief description of the drawings]
FIG. 1 is a perspective view for explaining a configuration of a mold when performing a construction method according to the present invention.
FIG. 2 is a perspective view showing a state after placing concrete on a formwork.
FIG. 3 is a perspective view illustrating a configuration of a partition plate.
FIG. 4 is a perspective view illustrating the configuration of a column base and a base beam that are integrally configured.
FIG. 5 is a diagram showing an example of a formwork used when a column base and a base beam are continuously configured.
[Explanation of symbols]
A Formwork 1 Anchor bolt 2 Side wall forming part 2a Flat frame 2b-2d Modified frame 3 Partition plate 3a Partition material 3b Partition material 3c Reinforcement material 4 Base beam part 5 Column base part 6 Fixing bracket 7 Level plate 8 Steel column 8a Base plate

Claims (1)

  A method for constructing a concrete foundation comprising a column base and a base beam from which an anchor bolt protrudes, and a portion corresponding to the column base having a height substantially equal to the top end level of the column base. A side wall forming portion forming a side wall of a concrete foundation having a portion corresponding to the foundation beam portion having a top end level higher than the top end level of the column base, and a longitudinal end portion of the foundation beam portion And a mold frame having a partition plate extending from the upper end of the portion corresponding to the foundation beam portion in the side wall forming portion to the upper end of the portion corresponding to the column base, and the column base Anchor bolts are placed at predetermined positions, and then concrete is placed from above the formwork other than the part corresponding to the column base of the formwork, and the ceiling is lower than the foundation beam part partitioned by the partition plate. End level column base and foundation Method of constructing concrete foundation, characterized in that it constitutes a part integrated.

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