JP2001146752A - Continuous footing structure and its constructing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a continuous footing structure and its constructing method capable of saving labor in field work for bar arrangement, form installation, etc., and suppressing transportation cost. SOLUTION: This continuous footing is comprised of both a foundation footing part 2 made of reinforced concrete and a foundation raised part 3 raised upward from the foundation footing part 2. The foundation raised part 3 is comprised of a reinforced footing beam provided with upper and lower flanges 3a and 3b and a web 3c to connect both flanges 3a and 3b. In this reinforced footing beam, the upper surface of the upper flange 3a is a foundation top surface 14, and connectors 8 provided in such a way as to be protruded downward from the lower surface of the lower flange 3b are brought into a state embedded in the concrete of the foundation footing part 2 and joined and integrated with the foundation footing part 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a cloth foundation and a method of constructing the same.

[0002]

2. Description of the Related Art A basic footing section and a stand up from the basic footing section of a building having a first floor or a second floor as a basic structure when the superstructure is made of a lightweight steel frame and the weight of the building is relatively small. A continuous foundation having a foundation rising portion, that is, a cloth foundation may be employed.

[0003] Conventionally, the cloth foundation includes a cast-in-place reinforced concrete structure, a precast reinforced concrete structure, and a steel frame concrete structure using a steel frame as a core material.

[0004]

However, in the case of a cast-in-place reinforced concrete fabric foundation, it is necessary to arrange reinforcing bars and formwork on both the foundation footing portion and the foundation rising portion at the site. However, there is a problem that much labor is required to arrange the reinforcing bars and formwork on the site, and the construction period becomes long.

On the other hand, in the case of a precast reinforced concrete fabric foundation, work on site is reduced, but on the other hand, since the whole is made of reinforced concrete, the weight of the precast member is considerably large, and the transportation cost to the site is high. There was also a problem.

In the field, the precast members must be joined to each other, and the rebars of the respective precast members must be connected to each other at both the foundation footing portion and the foundation rising portion. In addition, the installation of the formwork required for concrete injection in the above-mentioned construction had to be performed for both the foundation footing section and the foundation rising section, and work at the site was not always easy.

Further, in the case of a reinforced concrete fabric foundation, regardless of whether the concrete is cast-in-place or precast, anchor bolts for connecting the upper structure to the foundation are accurately embedded in the foundation concrete. However, there is also a problem that it is not easy.

[0008] In the case of a steel-framed concrete fabric foundation,
The use of steel as the core material can reduce or omit the work of arranging the bars, and has the advantage that the superstructure can be joined to the steel foundation beam. And work for both the start-up part and the foundation, and the work on site was somewhat reduced, but it was troublesome.

The present invention has been made in consideration of the above-mentioned conventional problems, and has been made in consideration of the problems described above. An object of the present invention is to provide a foundation structure and a construction method thereof.

[0010]

The above object comprises a foundation footing portion made of reinforced concrete and a foundation rising portion rising upward from the foundation footing portion,
The foundation rising portion is composed of a steel foundation beam having upper and lower flanges and a web connecting these flanges, and the steel foundation beam has the upper surface of the upper flange as a foundation top surface and projects downward from the lower surface of the lower flange. The problem is solved by the structure of the cloth foundation, wherein the provided connector is embedded in the concrete of the foundation footing part and is integrated with the foundation footing part.

In this cloth foundation, the foundation footing portion is made of reinforced concrete, and the foundation rising portion is made of a steel foundation beam. Therefore, it is only necessary to arrange reinforcing bars and formwork only on the foundation footing portion. Therefore, it is possible to omit the arrangement of the reinforcing bars and the formwork, and to save labor at the site of the arrangement of the reinforcing bars and the formwork, thereby shortening the construction period.

In addition, the transportation to the site is performed by a precast member in which a foundation footing portion made of reinforced concrete is integrated with a foundation rising portion made of a steel frame beam, or a steel frame foundation beam. It is much smaller than a cloth foundation made entirely of precast reinforced concrete, so that transportation costs can be kept low.

[0013] In addition, the foundation rising portion of the fabric foundation of the present invention is composed of a steel foundation beam having upper and lower flanges and a web connecting these flanges. By using this upper flange, the upper structural part of the building can be jointed to the foundation with good construction accuracy and easy construction, and the accuracy is the same as when anchor bolts are embedded in reinforced concrete. A troublesome process that is difficult to secure can be eliminated.

Further, a steel frame foundation beam at a foundation rising portion;
With the reinforced concrete of the foundation footing part, the connector provided so as to project downward from the lower surface of the lower flange of the steel foundation beam is integrated into the concrete of the foundation footing part by being embedded and integrated, so that it is integrated with the foundation rising part The foundation footing part can be integrated firmly in strength and easy to construct and manufacture.

The above-mentioned cloth foundation is constructed by arranging the reinforcing bars of the foundation footing and installing the steel frame foundation beams on site, and then pouring the concrete of the foundation footing part so that the connector is embedded. If it is to be done, rebar and formwork on site need only be performed on the foundation footing part, which can save labor on site such as rebar and formwork installation, and thus shorten the construction period can do.

Further, the construction of the above-mentioned cloth foundation is carried out in such a manner that the connector of the steel foundation beam is embedded in the concrete of the foundation footing part, and the cloth foundation structure in which the steel foundation beam and the foundation footing part are combined and integrated in advance. If you make it and install it on the site,
It is only necessary to install this precast member, and the labor required for on-site work can be further reduced.

In addition, when joining reinforced concrete in joining precast members,
Connection of reinforcing bars in the foundation footing part and concrete formwork to be driven between the foundation footing parts are performed, and concrete is only required to be driven into that part. Can be omitted, and the on-site work can be further saved.

It is also possible to join the precast members only by joining the steel foundation beams. In such a case, it is possible to connect the reinforcing bars at the foundation footing portion or to construct the concrete formwork between the foundation footing portions. And the like can be omitted, and it is only necessary to join the steel frame foundation beams at the foundation rising portion, so that the work on site can be further reduced in labor.

[0019] In addition, as for the transportation of the precast member, the foundation footing is made of reinforced concrete, but the foundation rising portion is made of a steel frame foundation beam. Costs can be kept low.

[0020]

Next, embodiments of the present invention will be described with reference to the drawings.

In the cloth foundation 1 of the first embodiment shown in FIGS. 1 and 2, reference numeral 2 denotes a basic footing portion, and reference numeral 3 denotes a foundation rising portion rising upward from the footing portion 2. It goes without saying that the width of the basic footing portion 2 is larger than the width of the basic rising portion 3. In addition, 4 is split stone, 5 is discarded concrete, and the cloth foundation 1 is formed on the discarded concrete 5.

In the above-mentioned cloth foundation 1, the foundation footing portion 2 is made of reinforced concrete. 6 is a reinforcing bar, 7 is concrete. On the other hand, the foundation rising portion 3 is made of a steel foundation beam. The steel foundation beam 3 has upper and lower flanges 3
a, 3b and a web 3 connecting these flanges 3a, 3b
c, for example, an H-shaped steel as shown in the drawing.

On the lower surface of the lower flange 3b of the steel foundation beam 3, stud type connectors 8 are arranged in a plurality of rows in the left-right direction, and a plurality or a plurality of stud-type connectors 8 are provided at predetermined intervals in the longitudinal direction. , Is protruding. Lower flange 3b
Each stud connector 8 is attached to the stud connector 8 by welding or screws. Then, the lower flange 3b of the steel foundation beam 3 is positioned at the height of the upper surface of the foundation footing portion 2 so that the stud connectors 8 ...
Is embedded in the concrete 7 of the basic footing portion 2, whereby the basic footing portion 2 and the foundation rising portion 3 are joined and integrated.

In the cloth foundation 1, the upper surface of the upper flange 3a of the steel foundation beam 3 is the top surface 14 of the foundation, and the lower end of the pillar 9 of the upper structure of the building is joined to the upper flange 3a by bolts or the like. Will be done. in this way,
Since the joint of the upper structure 9 to the cloth foundation can be performed on the upper flange 3a of the steel foundation beam 3,
In the case of a reinforced concrete fabric foundation, troublesome precision determination of anchor bolts, which is necessary in the case of a reinforced concrete fabric foundation, is not required, and the upper structure 9 can be joined to the fabric foundation 1 with good construction accuracy and easy construction.

The construction of the cloth foundation 1 can be performed as follows. That is, as shown in FIGS. 3 (a) and 3 (b), a reinforcing bar 6 for foundation footing is arranged on the discarded concrete 5 and a steel frame foundation beam 3 is installed. FIG.
As shown in (b), the reinforcing steel bar 6 for footing is arranged at a position where a predetermined cover thickness can be secured from the bottom surface of the basic footing part to be formed.
The lower flange 3b is supported so as to be located at a height position higher than the upper surface of the discarded concrete 5 by the height of the basic footing portion.

The support of the steel frame foundation beam 3 is carried out by installing a gantry 10 between the lower flange 3 b of the steel frame foundation beam 3 and the discarded concrete 5. The gantry 10 has a function of supporting the steel foundation beam 3 at a predetermined height and a level adjusting function of adjusting the height position of the steel foundation beam 3 up and down.
Using this level adjustment function, the height position of the lower flange 3b of the steel frame beam 3 can be easily and accurately set to the height position of the upper surface of the base footing portion. In addition, the reinforcing bar 6 for footing may be arranged at a predetermined height position by using the gantry 10 together or by using another support.

After that, a formwork is set up, and concrete 7 is driven into the base footing 2 made of reinforced concrete as shown in FIG. When the concrete 7 is driven in, the stud connectors 8 projecting from the lower surface of the lower flange 3b of the steel foundation beam 3 are buried in the concrete 7, and thereby,
The foundation footing part 2 and the steel foundation beam 3 are combined and integrated, and the fabric foundation 1 having the footing part 2 and the rising part 3 is formed.

As described above, according to the above-described cloth foundation structure,
Reinforcing and form setting need only be performed on the foundation footing part 2, and need not be performed on the foundation standing part 3, and it is only necessary to install the steel frame foundation beam 3 for the foundation rising part 3, The work on site can be labor-saving, and the construction of the fabric foundation 1 can be performed in a short construction period. Moreover, since the steel foundation beam 3 only needs to be transported to the site, the weight is light and the transportation cost can be kept low.

In the cloth foundation 1 of the second embodiment shown in FIG. 4, a cloth foundation structure in which a steel frame foundation beam 3 and a foundation footing part 2 are integrally connected is manufactured in a factory or the like in advance. An object, that is, a product formed by transporting and installing the precast members 11, 11 to the site and joining the precast members 11, 11 to each other.

In the second embodiment, in joining the precast members 11, 11 on site, the reinforcing bars 6, 6 of the basic footing portions 2, 2 are joined. Therefore, as shown in FIG. 5 (a), the end position of the concrete 7 of the foundation footing part 2 of the precast member 11 is adjusted so that the end of the reinforcing bar 6 of the foundation footing part is exposed to the outside. It is recessed inward from the end face position.

The construction on site can be performed as follows. That is, as shown in FIGS. 5 (a) and 5 (b), the precast members 11, 11 are placed on the discarded concrete 5, and then, as shown in FIG. 6 are joined together. Joining of the reinforcing bars 6, 6 may be performed by various methods such as welding, gas pressure welding, use of a joint member, and the like. Also, the steel foundation beams 3, 3 may be bolted to each other using the plate 12 or the like as necessary.
3 and so on. It goes without saying that joining of the steel foundation beams 3, 3 can be performed more easily than joining of the reinforcing bars 6, 6.

Thereafter, a formwork is installed between the concretes 7, 7 of the foundation footing portion, and as shown in FIG.
Pour concrete 15 in. As described above, the precast members 11, 11 are joined to each other to form the fabric base 1.

As described above, according to the cloth foundation 1, the joining of the reinforcing bars of the precast member and the installation of the formwork at the joining portion need only be performed on the basic footing portion 2, and the joining of the reinforcing bars is performed. And the installation of concrete formwork is not necessary for the foundation rising part 3 consisting of steel foundation beams,
The on-site joining work of the precast members 11, 11 can be performed with reduced labor. Therefore, it is possible to realize not only a short construction time due to the use of the precast members 11 and 11, but also a further short construction time through labor saving of joining of the precast members 11 and 11. Moreover, for transportation to the site, only the foundation footing part 2 is reinforced concrete,
The foundation rising portion 3 is intended for a lightweight precast member 11 made of a steel foundation beam, so that transportation costs can be reduced.

In the above-described second embodiment, the joining of the precast members 11 and 11 is
The connection between the reinforcing bars 6 and 6 in the basic footing portion 2 and the driving of concrete between the two basic footing portions may be omitted. According to this, it is only necessary to join the steel foundation beams 3, 3 at the foundation rising portion, and the joining of the steel foundation beams 3, 3 is very easy, and the work on site is further reduced in labor. Becomes possible. Moreover, the precast members 11, 11 can be firmly joined to each other by joining the steel frame foundation beams 3, 3.

Although the embodiment of the present invention has been described above, the present invention is not limited to this, and various changes can be made without departing from the spirit of the invention. For example, in the above embodiment, the case where the height position of the lower flange 3b of the steel foundation beam 3 constituting the foundation rising portion 3 and the upper surface height position of the foundation footing portion 2 are substantially the same is shown. The height of the upper surface of the base footing 2 is set at an intermediate height between the upper and lower flanges 3a and 3b, and the lower flange 3b is buried in the concrete 7 of the base footing 2. You may do so. In the above-described embodiment, a stud type connector is used as a connector to be embedded in the concrete 7 of the basic footing part 2; however, the connector is not limited to the stud type, and the point is that the basic footing part 2
By embedding in concrete 7 of
What is necessary is just to be able to couple and integrate the steel foundation beam 3 and the foundation footing part 2, and various forms of connectors may be used. Further, in the above embodiment, the case where the H-section steel is used as the steel frame foundation beam is shown, but the point is that the upper flange for joining the upper structure portion and the connector are attached to the foundation footing portion 2. What is necessary is just to be provided with the lower flange integrated and the web which connects these flanges. Needless to say, the construction of the fabric foundation of the present invention may be performed by various methods other than those described above.

[0036]

As described above, the structure of the fabric foundation and the method of constructing the fabric according to the present invention are as described above. Therefore, it is possible to save labor such as rebar arrangement and formwork installation on site. And transportation costs can be kept low. In addition, troublesome precision setting of the anchor bolt for joining the upper structure to the foundation becomes unnecessary, and the upper structure can be jointed with good construction accuracy and easily.

[Brief description of the drawings]

FIG. 1 shows the structure of a fabric base according to a first embodiment. FIG. 1A is a cross-sectional side view, and FIG. 1B is a cross-sectional view.

FIG. 2 is a perspective view of the same.

FIGS. 3A to 3C are side views sequentially showing a construction method.

FIGS. 4A and 4B show a structure of a fabric base of a second embodiment, wherein FIG. 4A is a cross-sectional side view, and FIG.

FIGS. 5A to 5D are side views sequentially showing a construction method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Cloth foundation 2 ... Foundation footing part 3 ... Steel frame foundation beam (Foundation rising part) 3a ... Upper flange 3b ... Lower flange 3c ... Web 6 ... Reinforcing bar 7 ... Concrete 8 ... Connector 9 ... Column (upper structural part)

Claims (3)

[Claims] 1. A foundation footing portion made of reinforced concrete, and a foundation rising portion rising upward from the foundation footing portion. The foundation rising portion comprises a steel frame foundation beam having upper and lower flanges and a web connecting these flanges. , This steel foundation beam uses the upper surface of the upper flange as the foundation top surface,
A structure of a fabric base, wherein a connector provided to project downward from a lower surface of a lower flange is embedded in concrete of a foundation footing part and is integrated with and integrated with the foundation footing part. 2. The method for constructing a fabric foundation according to claim 1, wherein after the reinforcement of the foundation footing and the installation of the steel foundation beam are performed on site, the concrete of the foundation footing part is embedded in the connector. A method of constructing a cloth foundation, characterized by being cast in such a manner that: 3. The method for constructing a fabric foundation according to claim 1, wherein the connector of the steel foundation beam is embedded in the concrete of the foundation footing part, and the steel foundation beam and the foundation footing part are joined and integrated. A method of constructing a fabric foundation, comprising: fabricating a fabric foundation structure in advance and installing the fabric foundation on site.