JP3236950B2 - Embedded column base and method of construction - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a column base structure for fixing a lower portion of a steel column into a foundation beam concrete, and more particularly, to a cylindrical container having an open upper surface, which is carried out when constructing a steel frame building. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an embedded column pedestal having a structure in which an embedded column pedestal case is buried in foundation beam concrete, and a lower end portion of a steel column is inserted into the embedded column pedestal case and fixed, and a construction method thereof.

[0002]

2. Description of the Related Art Conventionally, the following techniques belong to the public regarding an embedded column base of a steel column and a method of constructing the same. JP-A-61-92265 discloses that after a foundation beam is constructed, a column base frame of a cylindrical container structure is set on the upper surface of the foundation beam, and a lower portion of a steel column is inserted into the column base frame. Further, there is described an embedded type column base in which concrete is cast into the column base frame to fix the column, and a method of constructing the column base. A flange portion is provided at the upper end of the column base frame, and a flat gusset plate provided on the outer periphery of the steel column is overlapped on the flange portion,
At this time, the height is adjusted by inserting a liner, and the flange portion and the gusset plate are fastened with bolts. Japanese Unexamined Patent Publication No. Hei 4-49328 discloses that a reinforcing joint plate is provided at the upper and lower ends of an embedded column base case (outer shell steel pipe) buried in a foundation beam concrete, and the lower end of a steel column is mounted in the embedded column base case. Insert the upper end rebar joint plate and join it to the steel column by welding etc. through angles etc.Also, join the reinforcing bar of the foundation beam to the upper and lower rebar joint plates, and make the gap between the embedded column base case and the steel column And a method of constructing an embedded column pedestal, in which a concrete beam is filled and a steel column is fixed, and then a foundation beam concrete is cast. Further, JP-A-5-195538 discloses that an installation leg is fixed on an upper surface of discarded concrete with an anchor bolt or the like, and an embedded column base case is mounted on the installation leg.
Thereafter, the foundation beam concrete is cast, and then the lower part of the steel column is inserted into the embedded column base case, and the flange provided on the outer periphery of the column is placed on the upper end of the embedded column base case, and both are anchored. An embedded column base, which is fastened with bolts, fills the embedded column base case with high-strength mortar, and then casts floor concrete, and a method of installing the same is described. Japanese Unexamined Patent Publication No. 7-54351 discloses that reinforcing steel connection fittings are provided above and below a buried column base case buried in concrete of a foundation beam, and that the reinforcing steel of the foundation beam is joined to the reinforcing steel fitting, Insert the lower part of the steel column into the column base case, adjust the height with a leveling bolt using a metal member provided on the outer periphery of the steel column, and adjust the high strength mortar into the embedded column base case. An embedded column base, which is filled and fixed to a column, and a method of installing the column base are described.

[0003]

[Problems to be solved by the present invention]

(1) In the case of the invention described in Japanese Patent Application Laid-Open No. 61-92265, a column-base frame is installed on the upper surface of the foundation beam. In comparison with, the magnitude of the fixed moment that can be transmitted from the steel column to the foundation beam depends on the strength of the column base frame, so that a very large transmission capacity cannot be expected. (2) In the case of the invention described in JP-A-4-49328, the embedded column base case is embedded in the foundation beam concrete, and the reinforcing bars of the foundation beam are joined to the upper and lower plates. Thus, the above problem (1) has been solved. However, there is no disclosure of means for installing the embedded column base case in the foundation beam at an appropriate position, and further lacks means for adjusting the horizontal and vertical positions of the steel column inserted into the embedded column base case. There is a doubt about the possibility and accuracy of the work of adjusting the position of the pillar. (3) In the case of the invention described in JP-A-5-195538, an anchor frame (installation leg) as a means for installing an embedded column base case in a foundation beam concrete at an appropriate position is disclosed. However, since there is no means for adjusting the horizontal and vertical positions of the steel column inserted into the embedded column base case, there is still a question about the possibility and accuracy of the operation of adjusting the position of the column. (4) In the case of the invention described in JP-A-7-54351, although means for adjusting the vertical position of the steel column inserted into the embedded column base case is disclosed, There is no disclosure of means for adjusting the centering of the pillar, and there is still doubt about the possibility and accuracy of the work of adjusting the position of the pillar.

Accordingly, it is an object of the present invention to provide not only means for installing an embedded column base case into a foundation beam at an appropriate position, but also horizontal and vertical positions of a steel column inserted into the embedded column base case. Each with means to adjust,
An object of the present invention is to provide an embedded column base and a method of constructing the same, which can easily adjust the position of a steel column and can raise the accuracy of the necessary and sufficient manner.

[0005]

As means for solving the above-mentioned problems, the invention according to claim 1 is to embed an embedded column base case of a cylindrical container structure having an open upper surface in a foundation beam concrete. In the embedded column pedestal configured by inserting and fixing the lower end of the steel column into the embedded column pedestal case, the embedded column pedestal case is disposed at the position of the column on the discarded concrete via the installation leg. It is installed, foundation beam concrete in a boxed state is cast so that the flange portion provided at the upper end of the embedded column base case is exposed, the lower part of the steel column is inserted into the embedded column base case, A flange fixed to the outer periphery of the steel column is overlapped on the flange portion of the embedded column base case, the height of the column is adjusted by operating a vertical vertical push bolt, and a horizontal lateral push bolt is provided. The centering adjustment in the horizontal direction is performed by the adjustment, that both flanges are fastened with fixing bolts, that the gap between the embedded column base case and the steel column is filled with mortar and the steel column is fixed, Each feature.

A plurality of studs are protruded from the outer peripheral surface of the embedded column base case according to claim 1;
In addition, concrete is filled in the recess of the foundation beam in which the flange at the upper end of the embedded column base case is box-opened. A vertical enclosure wall is provided along an outer peripheral edge of a flange portion at an upper end of the embedded column base case according to claim 1, and a plurality of lateral push bolts are screwed into the enclosure wall in a symmetrical arrangement in plan view. The tip of the lateral push bolt is pressed against the flange of the steel column, and a plurality of vertical push bolts and fixing bolts are provided alternately around the flange in plan view. The vertical push bolt is screwed downward into the flange and its tip is pressed against the upper surface of the flange portion, and the fixing bolt is capable of horizontal centering adjustment provided on the flange of the steel column. It is characterized by being passed through a bolt hole of a size.

Next, according to a fourth aspect of the present invention, an embedded column base case of a cylindrical container structure having an open upper surface is embedded in a foundation beam concrete, and a lower end portion of a steel column is inserted into the embedded column base case. Is a method of installing an embedded column base that is constructed by inserting and fixing, where the installation base with the embedded column base case attached to the upper part is installed at the position of the column built on the discarded concrete surface, Fixing with an anchor bolt, placing the foundation beam concrete in a box-open state so that a flange portion provided at the upper end of the embedded column base case is exposed, and developing the foundation beam concrete. After curing, insert the lower part of the steel column into the embedded column base case, stack the flange fixed to the steel column on the flange portion of the embedded column base case, Adjusting the height position of the column by operating the column, adjusting the centering of the column by operating the horizontal lateral push bolt, and then fastening and fixing both flanges with fixing bolts; Filling the gap between the case and the steel column with mortar and fixing the steel column.

[0008] In addition, concrete is finally filled in the recess of the foundation beam in a boxless state so as to expose the flange at the upper end of the embedded column base case.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, the present invention embeds an embedded column base case 1 having a cylindrical container structure having an open upper surface in a foundation beam concrete 2, and includes the embedded column base case. It is carried out to construct an embedded column base configured by inserting and fixing the lower end of the steel column 3 into 1.

The procedure for constructing the embedded column base is as follows. First, the position of the column is to be marked on the upper surface of the discarded concrete 4 which has been cast in advance and has exhibited strength, and the installation leg 5 is provided at that position. An embedded column base case 1 is installed. The mounting legs 5 are discarded from the embedded column base case 1 until the foundation beam concrete is cast and the strength is developed.
It serves as a support for the upper part, and has a role of substantially determining the height position of the embedded column base case 1 embedded in the foundation beam 2. The embedded column base case 1 supported above the discarded concrete 4 by the installation legs 5 has a thickness of the foundation beam concrete 2 corresponding to the height dimension from its lower end to the discarded concrete, and the vertical column which the steel column 3 bears. The concrete thickness is useful for the treatment of the stress because the treatment is performed under the load of the load. The height of the mounting leg 5 is a prism of 350 mm, usually about 700 mm, and is manufactured using an angle or the like.

The embedded column base case 1 is previously integrated with the upper end of the mounting leg 5 by welding or the like at a factory or at a site. An anchor bolt 6 is buried in advance or provided as a hole-in anchor at the position where the pillar is to be built in the abandoned concrete 2, and the installation leg 5 is fixed by the anchor bolt 6. A plurality of stud bolts 7 protrude in the horizontal direction from the outer peripheral surface of the trunk portion of the embedded column base case 1 so as to improve the coupling force with the foundation beam concrete 2 and the bearing effect.

After the required number of embedded column base cases 1 has been installed on the discarded concrete 4 in the manner described above, and the assembling of the foundation beam reinforcing bars (not shown) and the formwork have been performed, the foundation beam The concrete 2 is cast. At the time of placing the foundation beam concrete 2, as is apparent from FIG. 2, the flange 8 provided at the upper end of the embedded column base case 1 is completely exposed, and the vertical and horizontal bolts described later are used. Concrete is cast without a box so as to form a recess 9 having a sufficient width and depth necessary for the work of correcting and fastening the columns.

As a step after the foundation beam concrete 2 has been cured until it exhibits a predetermined strength, the lower part of the steel column 3 is inserted into the embedded column base case 1. At this time, dimension design is performed between the bottom surface of the embedded column base case 1 and the lower end of the column to leave a gap S necessary for wraparound of a filling mortar described later. Specifically, the flange 10 is fixed to the outer periphery of the steel column 3 by welding or the like at a height position at which the gap S is secured.

Therefore, when the lower portion of the steel column 3 is inserted into the embedded column base case 1, the flange 10 overlaps with the flange portion 8 at the upper end of the embedded column base case 1 and reaches a dead end. When a vertical push bolt 11 is screwed into the screw hole of the flange 10 in advance, the vertical push bolt 11 abuts on the upper surface of the flange portion 8. As for the fixing bolts 12 which penetrate the flange portion 8 and the flange 10 in common, the bolt heads are temporarily attached to the lower surface of the flange portion 8 by spot welding and are passed upward, and two washers 20 are set from above. Lock nut 1
Screw 3 in. Incidentally, the bolt hole 14 of the flange 10 through which the fixing bolt 12 is passed is provided with a size that allows for a correction of the way of building the column (particularly, correction of centering in the horizontal direction). For this reason, the washer 20 has a large thickness so as not to be deformed by receiving a fastening force due to the large bolt hole 14 as described above. A nut 16 is fixed to a vertical surrounding wall 17 provided along the outer peripheral edge of the flange portion 8, and a horizontal push bolt 15 is screwed into the nut 16, and the tip of the bolt is a flange of the steel column 3. Peripheral edge (or a projection provided in place of the same edge is acceptable)
It is in a state of hitting.

The work procedure for modifying the method of constructing the steel column 3 is as follows: the lower part of the steel column 3 is inserted into the embedded column base case case 1 to proceed with the method of construction, and further the beams are incorporated to construct the frame. At the stage when the assembly and bolts are temporarily tightened, horizontal alignment adjustment, height adjustment and distortion correction, falling adjustment, vertical alignment, etc. of the pillar are performed comprehensively. For example, the height of the pillar is adjusted mainly by turning the vertical push bolt 11 to move it up and down. The centering of the column is adjusted by turning the horizontal push bolt 15 in and out of four horizontal orthogonal directions to push the flange 10 of the steel column 3 in a required direction. Thus, when the correction of the construction is completed, the bolts of the columns and beams are fully tightened, and the fixing bolts 12 at the lower portions of the columns are fully tightened by the lock nuts 13, so that both flanges are fixed by bolts.

As shown in FIG. 3, in order to achieve the above-mentioned purpose and operation and effect, as shown in FIG. 3, the horizontal push bolts 15 are symmetrically arranged two by two on each side of a square in plan view. Several screws are screwed in the direction. A plurality of vertical push bolts 11 and fixing bolts 12 are provided alternately around the flange 10 when viewed in plan.

Thereafter, the gap between the embedded column base case 1 and the steel column 3 is filled with mortar 19 to fix the steel column 3. This mortar filling operation can be easily and reliably performed because the mortar 19 is prevented from flowing out by the surrounding wall 17 provided along the outer peripheral edge of the flange portion 8 of the embedded column base case 1. . Since the steel column 3 in the illustrated example uses a square steel pipe having a side of about 200 mm, the lower end opening is closed by a bottom plate to increase the strength and enhance the filling effect of the mortar 19. However, in addition to the square steel pipes, round steel pipes, H-section steels, assembled columns, and the like can be adopted and implemented as the steel columns 3 as necessary for architectural design. Accordingly, the plane shapes of the embedded column base case 1, the upper end flange portion 8, the flange 10, and the like are selected and implemented so as to be suitable for the column shape of the column.

Finally, the recess 9 of the foundation beam 2 formed by punching out the box so that the flange 8 at the upper end of the embedded column base case is exposed is filled with concrete 18 (or mortar or the like). The concrete 18 embeds the vertical vertical push bolt 11 and the fixing bolt 12 and the horizontal horizontal push bolt 15 to achieve the permanent fixing of the bolt and the purpose of rust prevention.

[0019]

According to the embedded column base and the method for constructing the same according to the present invention, the work of adjusting the centering of the steel column in the horizontal direction and adjusting the height in the vertical direction can be performed easily, freely and accurately. Since it can be performed reliably, it eventually contributes to the leveling of the construction work process of steel-framed buildings, the improvement of construction accuracy, and the improvement of quality.

[Brief description of the drawings]

FIG. 1 is an elevational view of the overall structure of an embedded column base of the present invention.

FIG. 2 is a sectional view of a main part of the embedded column base of the present invention.

FIG. 3 is a plan view taken along line 3-3 of FIG. 2;

FIG. 4 is an enlarged sectional view of a right flange portion of FIG. 2;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Embedded column base case 1 Foundation beam (foundation beam concrete) 3 Steel column 4 Discarded concrete 5 Installation leg 8 Flange part 19 Mortar 9 Box-cut recessed part 18 Concrete 10 Flange 11 Vertical push bolt 12 Fixing bolt 15 Side push bolt 17 Enclosure wall

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-61-92265 (JP, A) JP-A-1-260119 (JP, A) JP-A-4-27045 (JP, A) JP-A-5-265 306524 (JP, A) JP-A-4-70492 (JP, A) JP-B-7-84763 (JP, B2) JP-A-12-11453 (JP, Y1) (58) Fields investigated (Int. Cl. ⁷ , DB name) E02D 27/00

Claims (4)

(57) [Claims] 1. An embedded column-base case having a cylindrical container structure with an open upper surface is embedded in a foundation beam concrete, and a lower end portion of a steel column is inserted into the embedded column-base case and fixed. In the embedded column pedestal, an embedded column pedestal case is installed via an installation leg at a column building position on abandoned concrete, and a box is removed so that a flange portion provided at an upper end of the embedded column pedestal case is exposed. The foundation beam concrete in the state is cast, the lower part of the steel column is inserted into the embedded column base case, and the flange fixed to the outer periphery of the steel column is overlaid on the flange portion of the embedded column base case. The height of the column is adjusted by operating the vertical vertical push bolt, the horizontal alignment is adjusted by adjusting the horizontal horizontal push bolt, and both flanges are fastened with fixing bolts. A mortar is filled in a gap between the embedded column base case and the steel column, and the steel column is fixed, respectively. 2. A plurality of studs protruding from the outer peripheral surface of the embedded column base case according to claim 1, and a recess of a foundation beam in which a flange at an upper end of the embedded column base case is box-opened. An embedded column base characterized by being filled with concrete. 3. A vertical enclosing wall is provided along an outer peripheral edge of a flange portion at an upper end of the embedded column base case according to claim 1, and a horizontal push bolt is symmetrical in a plan view on the enclosing wall. A plurality of screws are screwed in the arrangement, the tip of the same horizontal push bolt is pressed against the flange of the steel column, and the vertical vertical push bolt and the fixing bolt are alternately arranged on the periphery of the flange when viewed in plan. A plurality of the vertical push bolts are screwed downward into the flange and the ends thereof are pressed against the upper surface of the flange portion, and the fixing bolt is a horizontal centering provided on the flange of the steel column. An implantable pedestal characterized by being passed through an adjustable bolt hole. 4. An embedded column base case having a cylindrical container structure having an open upper surface is embedded in a foundation beam concrete, and a lower end portion of a steel column is inserted and fixed into the embedded column base case. A method of constructing a recessed column base, where
Installing the installation leg with the embedded column base case attached to the upper part and fixing it with anchor bolts; and removing the box beam concrete so that the flange provided at the upper end of the embedded column base case is exposed, and Casting and inserting the lower part of the steel column into the embedded column base case after curing until the foundation beam concrete develops strength,
The flange fixed to the steel column is overlapped on the flange portion of the embedded column base case, the height of the column is adjusted by operating a vertical vertical push bolt, and the column is adjusted by operating a horizontal lateral push bolt. Performing centering adjustment, and then fastening and fixing both flanges with fixing bolts, and filling the gap between the embedded column base case and the steel column with mortar and fixing the steel column, respectively. A featured method of installing embedded column bases.