JP2530053B2 - Building foundation construction method - Google Patents

Description

The present invention relates to a method for constructing a concrete foundation of a building, and can be applied to a building foundation having a steel frame structure.

[Background technology]

In a building with a steel frame structure, there are an embedded column base and an exposed column base in a column base that is a joint portion of a column with a concrete foundation. The embedded column base is to embed a foundation column with a stud bolt projecting into the concrete foundation and join the building column to the upper portion of the foundation column protruding from the upper surface of the foundation. The exposed column base is to form a frame of concrete foundation by combining reinforcing bars vertically and horizontally, projecting anchor bolts from the upper surface of the concrete foundation, and fixing the base plate provided at the lower end of the column of the building by this anchor bolt. .

[Problems to be Solved by the Invention]

According to the above conventional method, the placement position of the foundation pillar and the anchor bolt is determined by performing marking work, etc., but this work is not always accurate and errors occur, so the foundation construction accuracy is low It was. Also,
Skilled workers are required to combine the reinforcing bars vertically and horizontally to form the concrete foundation frame.
Moreover, this work took a lot of time and effort. For this reason, even if industrialization was achieved for a building built above a concrete foundation, conventionally it took a long time to construct the foundation.

It is an object of the present invention to provide a foundation construction method for a building that can improve the construction accuracy of the foundation, facilitate the construction work, and shorten the construction period.

[Means for solving the problem]

The foundation construction method for a building according to the present invention includes pipe members arranged at predetermined positions where columns of the building should be erected, and these pipe members are pre-manufactured in a factory and provided with a mold holder. The pipe member and the connecting beam are connected by a connecting beam, and then a flat plate-shaped basic forming mold is attached to the form holder to enclose the pipe member and the connecting beam with the basic forming mold, and the concrete is formed inside the surrounding frame. It is characterized in that the operation of pouring the slurry and the insertion of the lower portion of the column into the tube member and fixing the column with the grout material filled in the tube member.

In the above, either the operation of placing the concrete slurry inside the basic forming mold or the operation of inserting the lower portion of the column into the pipe member and fixing it with the grout material may be performed first. The basic forming mold may be removed after the concrete slurry is solidified, or may be left as it is.
When left as it is, the formwork is used as a surface material for the foundation.

[Action]

When each pipe member is connected with the connecting beam, the interval between the pipe members is determined, and the connecting beam is manufactured in advance at the factory and transported to the construction site, so the length dimension is accurate. Therefore, the interval between the pipe members can be set to a predetermined accurate interval, and the foundation can be completed with high accuracy. Also,
The pipe member and the connecting beam form a skeleton, and if the pipe members are connected with the connecting beam, the assembling work of this skeleton is completed,
Since this work can be performed easily and in a short time, the work for constructing the foundation can be facilitated and shortened.

Also, when the connecting beam is manufactured at the factory, a frame holder is provided on the connecting beam, so when surrounding the pipe member and the connecting beam with the foundation forming formwork at the construction site of the building. In addition, the basic forming mold can be easily arranged at a predetermined position only by attaching the basic forming mold to the mold holder, and thus the work can be speeded up and facilitated.

〔Example〕

An embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows a member forming a basic framework, which is composed of a pipe member 1 and a connecting beam 2. Pipe member 1
Is made of square steel pipe, and only the top surface is open. The connecting beam 2 is a steel beam, and the upper member 3 and the lower member 4 are diagonal members 5.
They are joined together in the shape of a lattice beam.

For the upper material 3 and the lower material 4, a mold holder 6 is formed in a direction perpendicular to these.
Are attached, holes 7 are formed in the vertical portions 6A at both ends of the form holder 6, and nuts 8 are fixed to the back side of the holes 7. A height level adjusting bolt 9 is vertically provided on the lower member 4, and the bolt 9 is screwed into a nut 10 fixed to the lower member 4.
The amount of protrusion from the lower member 4 can be adjusted, whereby the height level of the connecting beam 2 can be adjusted.

A plurality of the above mold holders 6 and height level adjusting bolts 9 are provided in the longitudinal direction of the connecting beam 2.

Of the four side surfaces of the pipe member 1, a bracket 11 is attached to a side surface to which the connecting beam 2 is connected, and the bracket 11 is vertically arranged at the same intervals as the upper member 3 and the lower member 4 of the connecting beam 2. Two pieces are provided, and holes 12 are formed in each bracket 11. In addition, holes 13 are formed at the ends of the upper member 3 and the lower member 4 of the connecting beam 2, and bolts 14 are passed through these holes 12 and 13 to fasten a nut 15, whereby the pipe member 1 and the connecting beam 2 are connected. It is designed to be linked with.

In the above, the connecting beam 2 is pre-manufactured in the factory together with the pipe member 1 and then transported to the construction site. Each of the connecting beams 2 is manufactured as having an accurate length corresponding to a predetermined distance between the pipe members 1 connected to each other by these connecting beams 2.

 Next, the construction procedure of the foundation will be described.

As shown in FIG. 3, the foundation according to this embodiment has a wide footing portion 16 and a narrow rising portion 17 on the footing portion 16.
The pipe member 1 and the connecting beam 2 form a skeleton of the rising portion 17, and the footing portion 16 is previously formed on the discarded concrete 18.

As shown in FIG. 1, each pipe member 1 is attached to the footing portion 16
Above the predetermined position, namely the pillar 19 of the building (Fig. 3, 4
(Refer to the drawing) are arranged at respective positions to be erected, and the connecting beam 2 is arranged between these pipe members 1.
The pipe members 1 are connected with each other. At this time, the height level of the connecting beam 2 is adjusted by the height level adjusting bolt 9.
Although the vertical dimension of the pipe member 1 reaches the footing portion 6 in the drawing, the vertical dimension of the pipe member 1 is shortened,
The pipe member 1 may be supported by the height level adjusting bolt 9 in a state of being floated from the footing portion 16 via the connecting beam 2.

Next, as shown in FIG. 2, the base forming mold 20 is arranged around the outer periphery of the pipe member 1 and the connecting beam 2. A ring-shaped protrusion 20A is provided on the inner surface of these molds 20 at a position corresponding to the vertical portion 6A of the mold holder 6, and a bolt 21 inserted into the protrusion 20A from the outside of the mold 20. Through the hole 7 of the vertical portion 6A, and further screwed into the nut 8. As a result, the mold 20 is connected to the mold holder 6 and maintains the upright state.

Here, since the foundation molding form 20 is held by the framework of the foundation composed of the connecting beam 2 and the pipe member 1 via the form holder 6, the form 20 is shown in FIG. As described above, it may be a flat plate that does not stand alone by itself, and therefore, the form and structure of the form 20 is simple and its manufacture is easy.

After the pipe member 1 and the connecting beam 2 are surrounded by the form 20 in this way, concrete slurry is poured into the interior thereof. The pouring of this slurry is carried out up to the height position shown by the chain double-dashed line 22 in FIG. 2 to ensure the exposed state of the upper opening 1A of the pipe member 1.

After the concrete slurry has solidified, the bolts 21 are loosened and the formwork 20 is removed. As a result, as shown in FIG. 3, the concrete foundation 23 in which the rising portion 17 is provided on the footing portion 16 is completed. The rise of this foundation 23
Since a recess is formed by the ring-shaped protrusion 20A on the side surface of 17, the recess is filled with concrete slurry,
Finish the surface of the rising part 17.

Next, as shown in FIG. 3, the lower part of the column 19 is inserted into the inside of each pipe member 1 through the upper opening 1A, and as shown in FIG. 4, the inside of the pipe member 1 is filled with the grout material 24. . Before filling the grout material 24, the pillar is attached to the pipe member 1.
Position 19 in the front-back, left-right and up-down directions. This positioning can be performed, for example, by filling the inside of the pipe member 1 with a filling material such as crushed stone, or by welding the column 19 to the pipe member 1 via a connecting member.

When the grout material 24 is solidified, the pillars 19 are fixed to the pipe member 1, so that the pillars 19 are fixed to the concrete foundation 23.
The column pedestals are joined together, and thereafter, the work of constructing the steel beam between the columns 19 is performed as in the case of a building having a normal steel frame structure.

According to the present embodiment described above, since the connecting beam 2 for connecting the pipe members 1 to each other is manufactured in advance in the factory and has an accurate predetermined size, the intervals between the pipe members 1 become accurate, As a result, the respective pipe members 1 are securely arranged at the predetermined positions where the columns 19 should be erected, and the pipe members 1
The concrete foundation 23, which is a joint member with the pillar 19, is finished with high precision.

Further, the pipe member 1 and the connecting beam 2 form a frame of the rising part 17 of the concrete foundation, and if the pipe members 1 are connected by the connecting beam 2, the assembling work of this frame is completed. Since the assembly work can be performed without requiring special skill and can be performed in a short time, the work can be facilitated and the foundation construction period can be shortened.

Further, according to the present embodiment, since the mold holding tool 6 is provided on the connecting beam 2 manufactured in the factory, in order to surround the periphery of the pipe member 1 and the connecting beam 2 with the basic forming mold 20. The work for arranging the mold 20 at a predetermined position can be easily performed by the work of attaching the mold 20 to the mold holder 6, and thus the work can be speeded up and facilitated.

In the embodiment described above, the mold 20 was removed after solidification of the concrete slurry, but by using, for example, a glass fiber-containing concrete plate as the mold 20, leaving the mold as it is after solidifying the concrete slurry, The formwork may be used as a surface material for the foundation. In this case, the formwork and the formwork holder of the connecting beam are connected inside the formwork by bolts or the like so that the heads of the bolts or the like are not exposed to the outside surface of the formwork.

Further, in the above-mentioned embodiment, the pipe member 1 and the connecting beam 2 are embedded in the inside of the rising portion 17 of the concrete foundation 23, but it is also possible to extend these to the footing portion 16. Further, the concrete foundation to which the method according to the present invention can be applied is not limited to the foundation including the footing portion 16 and the rising portion 17, and the method according to the present invention can be applied to a foundation including only the rising portion.

Further, in the above-mentioned embodiment, the concrete slurry is poured into the inside of the basic forming mold 20, and after solidification of this slurry,
Although the lower portion of the column 19 is inserted into the pipe member and the column 19 is fixed to the pipe member 1 with the grout material 24, the order of these operations may be reversed.

〔The invention's effect〕

According to the present invention, since the pipe members are connected to each other by the connecting beams that are produced in advance in the factory and have the correct length dimension, the construction accuracy of the foundation is increased, and thereby the foundation and the building that is erected on the foundation are constructed. Since it is possible to increase the strength of the connection with, and it is not necessary to carry out the work of arranging the reinforcing reinforcing bars in the vertical and horizontal directions, and the work of making the skeleton consisting of the pipe members and the connecting beams can be done easily and in a short time, The foundation construction work becomes easy and the foundation construction period can be shortened.

Further, according to the present invention, since the connecting beam manufactured in the factory is provided with the form holder, this form is used to surround the pipe member and the connecting beam with the basic forming form. The work of arranging the mold at a predetermined position may be performed only by attaching the formwork to the formwork holder, and therefore, the work can be speeded up and facilitated, and the formwork can be installed via the formwork holder. Since it is held by the basic frame composed of the connecting beam and the pipe member, it becomes possible to make this formwork into a flat plate shape that does not stand alone by itself. The structure can be simplified, the manufacturing can be facilitated, and the cost can be reduced.

[Brief description of drawings]

FIG. 1 is a perspective view showing a pipe member and a connecting beam separately.
FIG. 2 is a front sectional view showing a state after the basic forming mold is assembled, FIG. 3 is a perspective view showing a state where a lower portion of a column is inserted into a pipe member after solidification of concrete slurry, and FIG. 4 is a pipe member. It is a sectional side view which shows the state which the column and the pillar were joined by the grout material. DESCRIPTION OF SYMBOLS 1 ... Pipe member, 2 ... Connection beam, 6 ... Form holder, 9 ... Height level adjustment bolt, 16 ... Footing part, 17 ... Upright part, 18
… Discarded concrete, 19… Pillars, 20… Foundation molding form, 23…
Concrete foundation, 24… grout material.

Claims (1)

(57) [Claims] 1. A pipe member is arranged at each predetermined position where a pillar of a building is to be erected, and these pipe members are connected by a connecting beam which is manufactured in advance in a factory and is provided with a form holder. After that, by attaching a flat plate-shaped basic forming form to the form holder, the pipe member and the connecting beam are surrounded by the basic forming form, and concrete slurry is placed therein. And a work of inserting the lower part of the column into the pipe member and fixing the column with grout material filled in the pipe member.