JP2003003487A - Column base-foundation unitary structure and method for constructing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To develop a new column base-foundation unitary structure which facilitates connection between a column base and an underground beam with accuracy, and to develop a method for constructing the column base-foundation unitary structure. SOLUTION: According to the structure, an underground beam gusset 5 is arranged on an upper surface of the underground beam 11 at an appropriate location, and a column base gusset 5 arranged at a lower portion of the column base 3b is fastener-connected to the underground beam gusset 15 which has one part thereof protruded from an upper surface of concrete 9, to thereby combine the underground beam 11 with the column base 3b in one body. According to the structure, only by setting the underground beam 11 in a foundation section 6, core alignment of the column base 3b can be accurately achieved, and therefore the number of steps required for setting the column base 3b can be reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention mainly relates to a basic structure of a building such as a steel structure house, and more particularly to a method of connecting a column base and an underground beam.

[0002]

BACKGROUND OF THE INVENTION Conventionally, as a method of installing a column base in a reinforced concrete building, a construction method using an anchor bolt B as shown in FIG. 12 has been adopted. In this construction method, the anchor bolt B is embedded in the foundation structure 1'with its upper part protruding, and the anchor bolt B
Anchor plate P is used as a support member of the. The anchor plate P is formed by processing a steel plate into a square shape, for example, and forming bolt holes at its four corners, and the anchor bolts B are inserted and fixed in the bolt holes. Therefore, in order to accurately install the column base 3b 'at the designed position, it is necessary to install the anchor bolt B at an accurate location in the foundation structure 1', which requires a relatively large number of steps. Was there.

By the way, the applicant of the present invention uses shaped steel as a strength member of the foundation, has a high construction efficiency, can set the anchor bolt accurately, can keep the height of the foundation low, and has a shallow root cutting dimension. We have devised a construction foundation and related members that can be constructed by excavating in a narrow range, and have already reached several patent applications and utility model registration applications (Patent 2813605, Patent 2832581, Patent) 2813967, JP2896967, Utility Model Registration No. 3024518, JP 9-151463A, JP 9-264029, JP 10-60912, JP 11-93260, JP 11-148136, JP 2000-170171, etc. ).

In order to erect the column bases in these foundation structures, as shown in FIG.
The anchor bolt B as shown in FIG. 2 is used, and the anchor bolt B is inserted and bolted to the base plate 3a 'provided at the bottom of the column base 3b'. Therefore, in order to accurately install the column base 3b 'at the designed position, it is necessary to install the anchor bolt B at an accurate location, and therefore a relatively large number of man-hours and peripheral members such as the anchor plate P are required. However, there is still room for improvement in this respect.

[0005]

The present invention has been made in view of such a background, and in particular, a novel column base capable of accurately and easily connecting a column base and an underground beam. The development of a basic integrated structure and its construction method is a technical issue.

[0006]

[Means for Solving the Problems] That is, in the column base integrated structure according to claim 1, steel underground shafts are combined in an appropriate plane frame shape in a root excavated in advance, and these are fixed within a certain range. In the foundation structure formed by surrounding with concrete, the underground beam gusset is provided at an appropriate position on the upper surface of the underground beam, with respect to the underground beam gusset having a part thereof projected from the concrete upper surface, It is characterized in that the column beam and the column base are integrated by fastening the column base gusset provided at the lower part of the column base by fasteners. According to the present invention, the column base can be accurately centered when the underground beam is installed in the root, and the man-hour required for installing the column base can be shortened.

In addition to the above requirements, the column base integrated structure according to claim 2 further comprises a level adjuster at a place where the column base is installed in the underground beam, and the column base is provided for the level adjuster. It is characterized by being placed. According to the present invention, the vertical alignment of the column base can be performed.

Further, in the column base integrated structure according to claim 3, in addition to the above requirements, a brace is connected between the underground beam gusset or column gusset and the steel material constituting the upper ridge. It is characterized by. According to the present invention, the rigidity of the building can be enhanced.

Further, in addition to the above requirements, the column base integrated structure according to claim 4 is characterized in that the column gusset is provided on all the surfaces of the column base in plan view. According to the present invention, the column base can be accurately positioned and the rigidity of the building can be enhanced.

According to a fifth aspect of the present invention, there is provided a method for constructing an integrated structure of a column base, wherein an underground steel beam excavated in advance is combined with an underground steel beam in an appropriate plane frame shape, and these are surrounded by a certain range of concrete. In the construction method of the foundation structure to
While connecting the underground beam in a cross shape, the level adjustment body is fixed to the cross shape central portion on the upper surface, and further the underground beam gusset is fixed around the level adjustment body to form a column base support unit, On the other hand, the base unit is fixed to the lower end of the column base and the column base gusset is fixed to the lower part of the column base to form a column unit, and the column base support unit is aligned with the reference line drawn in the root. Bring in,
After that, concrete is placed in the root area, and for the underground beam gusset that is partly protruding from the concrete after curing, the column gusset is joined by fasteners. It is characterized by integrating with the legs. According to the present invention, the column base can be accurately centered when the underground beam is installed in the root, and the number of steps required for installing the column base can be shortened.
Then, the above problems can be solved by using the requirements described in each of these claims.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be specifically described below based on the illustrated embodiments. FIG. 1 shows a cross-sectional shape of a building 2 including a foundation structure 1.
Is for supporting the pillar unit 3 in an upright state at an appropriate place. As shown in FIGS. 2 and 3, the foundation structure 1 is formed so as to be submerged in the root ground 6 excavating the reference ground surface GL at the construction site. It is appropriately pressed by a rammer or the like, and further discarded concrete 8 or the like is placed thereon.

In the column unit 3, as an example, a base plate 3a, which is formed by appropriately processing a steel plate, is welded to the lower end portion of a column base 3b to which a square steel tube is applied, and further, a steel plate is appropriately formed under the column base 3b. The column base gusset 5 having the bolt holes 5a formed therein is welded to all the surfaces of the column base 3b, that is, all the four side surfaces, in a plan view. When welding the column base gussets 5, as shown in the plan view of FIG. 6, the cores of the column base gussets 5 facing each other are shifted so that the underground beam gussets 15 welded in a straight line on the upper surface of the underground beam 11. Will be in contact with each other from the opposite side.

Next, the strength members of the foundation structure 1 provided in the root 6 will be described in detail. The foundation structure 1 is formed by combining steel underground girders 11 in an appropriate plane frame shape. As the underground girders 11, as an example, H-shaped steel,
The I-shaped steel or the like is applied, and the web 11c is formed so as to be orthogonal to the upper flange 11a and the lower flange 11b.
Equipped with. And the upper flange 11a in the underground beam 11
Also, bolt holes 11 are provided at appropriate locations on the lower flange 11b.
d is drilled. Further, an underground beam gusset 15 having a bolt hole 15a formed by appropriately processing a steel plate is welded to an appropriate position on the upper surface of the upper flange 11a.

The underground beam 11 is, for example, the lower rebar 1
2 is welded in advance in a factory, and the lower reinforcing bar 12 is formed by combining reinforcing bars of, for example, about 12 mm in a grid pattern at an appropriate pitch. Further, the upper flange 11a is provided with an upper reinforcing bar 13, which is a reinforcing bar preliminarily combined in the shape of a cross girder and is placed above the underground beam 11 in the root 6 so that an appropriate location can be obtained. Is welded to the ground flange 11a.

Further, the underground beam 11 has a lower flange 11b.
A spacer 14 is provided on the lower surface of the fixed spacer 14a formed by welding a square tubular member as shown in FIG. 3 and an adjustable spacer 14b to which a bolt nut is applied.
And Of course, all may be configured by the adjustable spacer 14b, or only the fixed spacer 14a may be used.

A gusset plate 16 is provided at the tip of the portion where the underground beams 11 are abutted and connected in an orthogonal state, as shown in FIG. 4 (a). The gusset plate 16 is provided between the upper flange 11a and the lower flange 11b so as to project so as to be orthogonal to the web 11c. Correspondingly, the gusset plate 11 of another underground beam 11 to be connected is provided. Bolt holes 16a are formed in the web 11c on the front end side in a portion overlapping the gusset plate 16.

Both of them are fixed by the bolt nut 18. Gusset plate 1 of course
When 6 is formed only up to the end face of the flange, a splice 17 may be additionally provided and fixed as shown in FIG. 4 (b). When connecting in the longitudinal direction, bolt holes 11d are formed in the web 11c as shown in FIG. 4 (c), and splices 17 are applied to the bolt holes 11d to fix them in a continuous manner. In this way, the foundation beam 1 is constructed by placing the concrete beams 9 in the root frame 6 after assembling the underground beams 11 in a plane frame shape.

Further, the foundation structure 1 is provided with a level adjusting body 19 as a member for supporting the pillar unit 3.
This is disclosed in Japanese Patent No. 2832581 “Level adjuster” by the present applicant, and as shown in FIG. 3, the movable cup 19b is screwed into the inside of the cylindrical fixed cup 19a in a nested manner. The height dimension can be adjusted by adjusting the screwing.

Then, as shown in FIG. 5, the underground beam 11 is connected so as to have a cross shape in plan view, and then the upper flange 11 is formed.
a The level adjusting body 19 is fixed to the cross-shaped center of the upper surface, four pieces of underground beam gussets 15 are attached to the periphery of the level adjusting body 19, and lower girder-like reinforcing bars 12 are welded to the bottom surfaces of the bracket beam 110 and the underground beam 11. Thus, the column base support unit 10 is configured.

The members constituting the column base integrated structure of the present invention have the above-mentioned constitution as an example, and the construction method of the column base integrated structure together with the construction method of the column base integrated structure will be described below. Will be described.

(I) Processing in the factory (see FIG. 5) When constructing the building 2, the processing of the members in the factory is performed before starting the work on the site or in parallel with the work on the site. According to the design aspect of the building 2, the underground beam 11, the column base support unit 10, the column unit 3 and the like, which are the constituent elements of the foundation structure 1, are manufactured.

In the processing of the underground beam 11, the steel material is cut into an appropriate size, and bolt holes 11d and 110d are formed in the upper flanges 11a and 110a, the lower flanges 11b and 110b and the webs 11c and 110c. Keep it. Further, the pillar base support unit 10 is processed into a cross shape in plan view by fixing and welding the short underground beam 11 to both side faces of the longitudinal center of the long underground beam 11. To Then, the level adjuster 19 is fixed to the center of the cross in the upper flange 11a, and four pieces of the underground beam gusset 15 are welded to the periphery thereof.

Further, the lower rebar 12 connected in a cross-shaped manner with a binding wire is welded to the lower surface of the lower flange 11b, and a spacer 14 is provided if necessary. Furthermore, the upper rebar 13 that is installed and fixed on the upper flange 11a at the site is also
The welding is carried out by combining them in the shape of a cross in a certain range, and if possible, the upper rebar 13 is also the upper flange 11.
Weld to a.

(Ii) Formation of roots (see FIGS. 3 and 7) On the other hand, at the construction site, the roots 6 are formed by digging the ground surface. After laying down, the discarded concrete 8 is placed, and thereafter, the reference line L1 accurately determined by a transit or the like according to the design dimension is marked on the discarded concrete 8. In this embodiment, the waste concrete 8
Although the level adjusting body 19 is embedded in the above so that the upper part thereof is projected, it is not always necessary depending on the construction mode.

(Iii) Carrying in the column base support unit and the underground beam (see FIG. 8) In this state, the column base support unit 10 and the underground beam 11 which have been processed in the factory are carried into the root 6 Along with
The reference line L2 drawn on the upper flange 11a is lined up so as to match the reference line L1 on the discarded concrete 8. Thereafter, the underground beam 11 in the column base support unit 10 and the other underground beams 11 are connected to each other, and a splice 17 is applied to the column base support unit 10 by using a bolt nut 17 to which a high-strength bolt is applied. The leg support unit 10 and the underground beam 11 are integrally connected in a plane frame shape. At this stage, the installation position of the column base unit 3 can be set to a position as designed, and specifically, the center of the cross beam 11 of the underground beam 11 in the column base support unit 10, that is, Level adjuster 19
Is the center of the column base unit 3.

(Iv) Installation and fixing of upper reinforcing bar Next, the upper reinforcing bar 13 processed in the factory is installed and fixed on the upper flange 11a of the underground beam 11. Subsequently, the height of the level adjuster 19 is adjusted, and the concrete 9 is placed in the movable cup 19b to flatten the upper surface.

(V) Setting of form (see FIG. 9) The form 100 is set in such a state,
The facing form plates 101 are held by a holding frame 102 so as to keep a constant space. Also, the form plate 101 and the roots 6
Forming board 1
01 is fixed.

(Vi) Concrete pouring and removing formwork (see FIGS. 9 and 10) After this, concrete 9 is poured according to a conventional method, and curing is carried out for a certain period of time to solidify the concrete 9. The base frame 1 is completed by removing the mold 100, removing the pressing sand 103, and injecting appropriate sand into the space where the pressing sand 103 was located. In such a completed state of the foundation structure 1, as shown in FIG. 10, the underground beam gusset 15 is projected on the upper surface of the concrete 9.

(Vii) Installation of pillar unit (see FIGS. 6 and 11) After that, the pillar unit 3 is carried into the site, placed on the level adjuster 19, and the bolt holes 5a in the pillar gusset 5 are installed. Then, the bolt holes 15a in the underground beam gusset 15 are aligned with each other, and the both are fastened by a bolt nut 18. At this time, the bolt holes 5a in the column base gusset 5 and the bolt holes 15a in the underground beam gusset 15 are fixed to the positions based on the design dimensions in advance, so that the alignment can be easily performed. The pillar unit 3 is installed in a centered position as designed.

(Viii) Construction work (see FIG. 1) Subsequently, the beam 2 is attached to the column base 3b of the column unit 3.
0, brace 25, etc. are built up to form the frame member of the building 2. Regarding the brace 25,
The rigidity of the building 2 can be increased by connecting to the column base gusset 5 of the column unit 3 or the underground beam gusset 15 of the foundation structure 1.
Further, in this embodiment, the stud 30 is provided, and the brace 25 is also connected to the underground beam gusset 15 provided on the underground beam 11 to fix the stud 30.

[0031]

According to the present invention, it is possible to accurately and easily connect the column pedestal and the underground beam while eliminating the conventionally used anchor bolts, thereby reducing man-hours and members. Cost reduction is possible.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view showing a column base integrated structure of the present invention.

FIG. 2 is a partially enlarged plan view showing strength members of the entire building to which the column base integrated structure is applied.

FIG. 3 is a vertical sectional side view showing a column base integrated structure in an enlarged manner.

FIG. 4 is a side view showing a mode of joining underground beams using various members.

FIG. 5 is a perspective view showing a column base support unit and a column unit.

FIG. 6 is a plan view showing a state in which a column base supporting unit and a column unit are integrated.

FIG. 7 is a perspective view showing a state where waste concrete is placed in the root area.

FIG. 8 is a perspective view showing a state in which a column base support unit and an underground beam are loaded into the root area.

FIG. 9 is a perspective view showing how concrete is poured into the root area.

FIG. 10 is a perspective view showing a basic structure in which a gusset is projected from an upper surface of concrete.

FIG. 11 is a perspective view showing a column base integrated structure configured by connecting a column unit to the foundation structure.

FIG. 12 is a vertical cross-sectional side view showing an installation structure of a column base on an existing reinforced concrete foundation.

FIG. 13 is a perspective view showing an installation structure of a column base with respect to a foundation structure using an existing model steel as an aggregate.

[Explanation of symbols] 1 Basic structure 2 buildings 3 pillar unit 3a base plate 3b pillar base 5 Pillar gusset 5a bolt hole 6 root 7 cracked stone 8 Discarded concrete 9 concrete 10 Column support unit 11 underground beams 11a Upper flange 11b Lower flange 11c web 11d bolt hole 12 Lower rebar 13 Upper rebar 14 Spacer 14a Fixed spacer 14b Adjustable spacer 15 Underground beam gusset 15a bolt hole 16 gusset plate 16a bolt hole 17 splice 18 bolt nut 19 Level control 19a Fixed cup 19b movable cup 20 beams 25 braces 30 studs 100 formwork 101 formwork plate 102 holding frame 103 Holding sand B anchor bolt P anchor plate L1 reference line L2 reference line GL standard ground surface

Claims (5)

[Claims] 1. A foundation structure in which steel underground beams are combined in an appropriate plane frame shape in a previously excavated root area, and further these are surrounded by concrete within a certain range,
An underground beam gusset is provided at an appropriate position on the upper surface of the underground beam.For an underground beam gusset having a part thereof projected from the concrete upper surface, a column base gusset provided at the bottom of the column base is provided. A column base integrated structure characterized by integrating the underground beam and column base by joining them with fasteners. 2. The column base integrated according to claim 1, wherein a level adjusting body is provided at a place where the column base is installed in the underground beam, and the column base is placed on the level adjusting body. Structure. 3. The column base integrated structure according to claim 1, wherein a brace is connected between the underground beam gusset or column gusset and the steel material forming the upper ridge. 4. The column base integrated structure according to claim 1, wherein the column base gusset is provided on all the surfaces of the column base when viewed in a plan view. 5. A method of constructing a foundation structure in which steel underground girders are combined into an appropriate plane frame shape in a previously excavated root area, and further these are surrounded by concrete within a certain range. The level adjustment body is fixed to the cross-shaped center part on the upper surface of the top, and the underground beam gusset is fixed around the level adjustment body to form a column base support unit. The base unit is fixed by fixing the base plate and the base gusset to the lower part of the base, and the base unit is carried in according to the reference line drawn in the root, and then the base By placing concrete inside and zipping the column gusset to the underground beam gusset, a part of which has protruded from the concrete after curing, A method for constructing a column base integrated structure, characterized in that the column base and the column base are integrated.