JPH04189919A - Precast concrete foundation - Google Patents

Abstract

PURPOSE:To improve workability for a concrete foundation by burying the base of a vertical foundation steel-framed column onto a concrete foundation body, and the bases of a plurality of horizontal foundation steel-framed girders in a horizontal direction from the side of the foundation body, enabling the steel-framed column to be jointed to the vertical foundation steel-framed column, and then enabling an underground girder to be jointed to the horizontal foundation girders. CONSTITUTION:A horizontal foundation steel-framed girder 6 is welded to each side of a vertical foundation steel-framed colunm 3 comprising of a prism member. In this state, the bases of the vertical foundation steel-framed colunm 3 and horizontal foundation steel-framed girder 6 are concealed with a rectangular concrete block, thereby constituting a precast concrete foundation 1. Then, the precast concrete foundation 1 is horizontally laid on blinding concrete at a work site. Thereafter, the lower end of a steel-framed colunm 4 is placed on the upper end of the vertical foundation steel-framed column 3 of a concrete base body 2 for the precast concrete foundation 1. Then, the lower ends of the aforesaid columns 3 and 4 are jointed to each other via extension pieces and joint plates 8, and the butt ends of the columns 3 and 4 are welded to each other.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a steel frame foundation, and more particularly to a precast concrete foundation placed under a steel column and to which the steel column is attached. It is.

[Prior art] Conventionally, when constructing a concrete foundation that is placed under a steel column and to which the steel column is attached and a plurality of underground beams are installed, the upper surface portion on which the concrete foundation is laid is After excavating and forming a recess, placing crushed stone in the recess, and pouring concrete on top of it, assembling the necessary reinforcing bars on top of the concrete, and erecting formwork around the reinforcing bars. , the method of pouring concrete into formwork is adopted. At that time, anchor bolts were embedded in the concrete and used to connect the legs of the steel columns.

[Problems to be Solved by the Invention] However, when constructing a concrete foundation as described in 1 and 2, the following problems occurred.

In other words, in the foundation construction method described above, when constructing a concrete foundation, a lot of work is required on site, such as reinforcing the base column legs, constructing the base form, and curing the anchor bolts, which lengthens the construction period. There were problems such as storage.

In addition, with the above foundation construction method, when a steel column is erected vertically, it is necessary to prepare the base level by applying base mortar on the foundation, and to check the level after the mortar has hardened. It took a while.

The present invention was made in view of these conventional problems, and an object of the present invention is to provide a precast concrete foundation that allows easy erection of steel columns on site.

[Means for Solving the Problems] The invention described in the claims is a precast concrete foundation that is placed under a steel column and is used to take up the steel column and attach a plurality of underground beams. The bases of the vertical foundation steel columns are buried in the concrete foundation body so that some of them protrude from the top surface of the concrete foundation body, and the bases of vertical foundation steel columns are buried in the concrete foundation body so that some of the columns protrude from the sides of the concrete foundation body in the horizontal direction. The bases of the horizontal foundation steel beams are buried respectively, and the steel columns can be connected to the vertical foundation steel columns, and the underground beam materials can be connected to the horizontal foundation steel beams. It is.

The invention according to claim 2 is the invention according to claim 1,
Four foundation steel beams are provided as the plurality of horizontal foundation steel beams, and these four horizontal foundation steel beams protrude from the side surface of the concrete foundation body at angles perpendicular to each other.

[Function] According to the present invention, the precast concrete foundation can be produced in a factory, so when constructing the concrete foundation, work such as reinforcing the base column base, constructing the base formwork, and curing the anchor bolts can be performed on site. This eliminates the need for concrete foundations and improves the workability of concrete foundations.

In addition, the lower end of the steel column is connected to the upper end of the vertical foundation steel column that protrudes upward from the concrete foundation body, and the underground beam material is connected to the tip of the horizontal foundation steel beam that projects horizontally from the concrete foundation body. Therefore, if the concrete foundation body is leveled, steel columns and underground beams can be automatically leveled.

[Examples] Examples of the present invention will be described below with reference to the drawings.

Fig. 1 is an external perspective view of a precast concrete foundation according to an embodiment of the present invention, Fig. 2 is a plan view showing the state in which the ends of steel columns and underground beams are connected to the precast concrete foundation; Figure 3 is a longitudinal sectional view showing the precast concrete foundation with the ends of the steel columns and underground beams connected.

As shown in FIGS. 1 to 3, the precast concrete 1 foundation 1 according to this embodiment has horizontal foundation steel beams 6 welded to each side of a vertical foundation steel column 3 made of a square column. In this state, the bases of the vertical foundation steel columns 3 and the horizontal foundation steel beams 6 are covered with square concrete.

The vertical foundation steel column 3 partially protrudes upward from the upper surface of the main body (hereinafter referred to as the concrete foundation body) 2a of the precast concrete foundation 2, and each side of the upper end of the vertical foundation steel column 3 An erection piece 5 is attached to the. 2 for election piece 5
Two bolt holes are drilled. This erection piece 5 is a steel column connected to the vertical foundation steel beam 3 (
They are also attached to each side of the upper end of the square pillar) 4.

When connecting the steel column 4 to the vertical foundation steel beam 3, the erection piece 5 of the vertical foundation steel beam 3 and the steel column 4 is
, 5, the connection plate 8 is passed between the two, and the connection plate 1-8 is bolted to each erection piece 5, and the butt ends of the vertical foundation steel beam 3 and the steel column 4 are welded together. It can be temporarily fixed for a while. Note that this erection piece 5 is cut after the butt ends are welded.

The number of horizontal foundation steel beams 6 attached to the concrete foundation main body 2 is four, and these four horizontal foundation steel beams 6 are attached to the concrete foundation main body 2 at angles perpendicular to each other when viewed from above. It protrudes from the side. That is, the four horizontal foundation steel beams 6 each protrude from the side surface of the concrete foundation body 2 in a cross shape, as shown in FIG. Each of the horizontal foundation steel beams 6 is formed from a 3-shaped steel beam, as shown in FIG. 1, although this is not particularly limited.

Then, the steel columns 4 are joined to the vertical foundation steel columns 3 of the precast concrete foundation 1 constructed in this manner as described above, while the horizontal foundation steel columns 6 are connected to the underground beam materials 10. are now joined.

Here, if we explain the underground beam material 10 to be joined to the precast concrete foundation l, this underground beam material 10
(1) The inside of the (2) section steel is covered with concrete 11 so that both ends of the section steel are left intact.

The precast concrete foundation 1 and the underground beam material 10 are the precast concrete foundation 1.
And the splice plate 1 that was passed to the underground beam material 10
This is done by bolting 4 to the precast concrete foundation and 0 to the underground beam.

Next, a case of construction using the precast concrete foundation 1 according to this embodiment having such a configuration will be described.

First, at the site, crushed stone 18 was placed in a pre-excavated recess.
The waste concrete 19 is poured, and the waste concrete 19
A precast concrete foundation 1 produced in advance at a factory is placed horizontally on top of the base.

Next, the lower ends of the steel columns 4 are placed vertically on the upper ends of the vertical foundation steel columns 3 of the concrete foundation body 2 that constitute the main body of this precast concrete foundation l, and then The tip of the vertical foundation steel column 3 and the bottom end of the steel column 4 are connected via the erection piece 5 and the connection plate 8.
The butt ends are joined by welding. After that, the erection piece 5 is cut.

On the other hand, the underground beam material 1o is joined to the tip of the horizontal foundation steel beam 6 via a splice plate 14.

Thereafter, a formwork is constructed around the outer periphery of the connecting portion between the horizontal foundation steel beam 6 and the end of the underground beam material 1°, and concrete 20 is poured to cover the connecting portion.

As described above, according to the precast concrete foundation of this embodiment, the following effects can be obtained.

That is, according to the precast concrete foundation of the above embodiment, the lower end of the steel column 4 is joined to the upper end of the vertical foundation steel column 3 that protrudes upward from the foundation body 2, and the lower end of the steel column 4 protrudes horizontally from the concrete foundation body 2. Since the underground beam material 10 can be joined to the tip of the horizontal foundation steel beam 6, if the concrete foundation main body 2 is leveled, the level of the steel column and underground beam material 10 will be automatically adjusted. You will be able to get it out.

In addition, since the precast concrete foundation 1 can be produced in a factory, there is no need to carry out work such as reinforcing the base column legs, framing the base form, and curing anchor bolts on site when constructing the foundation. Sex also improves.

Although one embodiment of the invention has been described above, the present invention is not limited to this embodiment, and various modifications can be made without changing the gist of the invention.

For example, in the embodiment described above, a case has been described in which four horizontal foundation steel beams 6 are provided on the sides of the concrete foundation main body 2, but the present invention is not limited to this. At least two or more horizontal foundation steel beams 6 may be provided on the sides of the concrete foundation body 2.

Further, the shape of the vertical foundation steel column 5 is not limited to a rectangular column, but may also be a T-shaped steel or other steel material.

[Effects of the Invention] As is clear from the above description, the present invention is a precast concrete foundation, in which the base of a vertical foundation steel column is buried in the concrete foundation body so that a portion thereof protrudes from the top surface, Furthermore, the bases of a plurality of horizontal foundation steel beams are buried in the concrete foundation main body so that a portion thereof protrudes horizontally from the side surface thereof, and the steel columns can be connected to the vertical foundation steel columns. On the other hand, since the underground beam material can be joined to the horizontal foundation steel beam, the precast concrete foundation can be produced in a factory, and when constructing the concrete foundation, the arrangement of the base column legs can be done on site. There is no need to perform work such as curing reinforcements, base formwork, and anchor bolts, improving the workability of concrete foundations.

In addition, the lower end of the steel column is connected to the upper end of the vertical foundation steel column that protrudes upward from the concrete foundation body, and the underground beam material is connected to the tip of the horizontal foundation steel beam that projects horizontally from the concrete foundation body. Therefore, if the concrete foundation body is leveled, steel columns and underground beams can be automatically leveled.

As a result, the construction period can be significantly shortened.

[Brief explanation of drawings]

Fig. 1 is an external perspective view of a precast concrete foundation according to an embodiment of the present invention; Fig. 2 is a plan view showing the precast concrete foundation connected to the ends of reinforced columns and other horizontal beams; Figure 3 is a vertical cross-sectional view showing the ends of reinforced columns and other horizontal beams connected to the same precast concrete foundation, and Figure 4 is a perspective view of underground beams connected to the same precast concrete foundation. be. l... Precast concrete foundation, 2... Concrete 1-, l, l; Foundation body, 3 ・Vertical foundation iron・
;J column, 4... Steel column, 6... Horizontal foundation steel beam, 1
0... Underground beam material. Figure 1

Claims (2)

[Claims] (1) A precast concrete foundation placed under a steel column to attach the steel column and multiple underground beams, with a portion of the concrete foundation protruding from the top surface. The base of a vertical foundation steel column is buried in the concrete foundation body, and the bases of a plurality of horizontal foundation steel beams are buried in the concrete foundation body so that a portion of the beam protrudes horizontally from the side surface of the concrete foundation body, and the base of a vertical foundation steel column is buried in the concrete foundation body. A precast concrete foundation, wherein the steel column can be joined to the horizontal foundation steel beam, and the underground beam material can be joined to the horizontal foundation steel beam. (2) Four foundation steel beams are provided as the plurality of horizontal foundation steel beams, and the four horizontal foundation steel beams protrude from the side surface of the concrete foundation body at angles perpendicular to each other. Precast concrete foundation according to claim 1.