Static structures (e.g. – buildings) – Machine or implement
Reexamination Certificate
1999-11-26
2001-04-24
Friedman, Carl D. (Department: 3635)
Static structures (e.g., buildings)
Machine or implement
C052S741100, C052S745210, C052S295000, C052S749100, C052S749100, C052S274000
Reexamination Certificate
active
06219989
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to the improvement on a construction method of joining a column and a beam both serving as main parts of steel frame structural material in the case of constructing a building structure on the basis of heavy-weight steel frame construction.
2. Description of the Prior Art
A so-called diaphragm construction method of joining a column and a beam by the steps of setting up each column on a footing by making it condition that an auxiliary joint member formed by a steel plate to join the end of a beam thereto is preliminarily mounted to the column by welding, and then placing the beam over between the auxiliary joint members to join the columns and the beam at their laps with connecting bolts is known as a construction method of joining a column and a beam both serving as main parts of steel frame structural material in the case of constructing a building structure on the basis of heavy-weight steel frame construction.
Since the conventional construction method (the diaphragm construction method) of joining the column and the beam as described above requires the column mounted with the auxiliary joint member, the column delivered after being assembled in a factory needs to be mounted with the auxiliary joint member before the delivery. Thus, the deformation or damage easily occurs to the auxiliary joint member mounted to the column in the course of transportation of the columns. Further, the auxiliary joint member mounted to the column makes it hard to load a truck with the columns in an orderly manner, resulting in troublesome loading.
Further, since each beam placed over between the columns takes the form having a joint portion as an inevitable consequence, a straight beam cannot be in use.
SUMMARY OF THE INVENTION
The present invention is provided to settle the above problems encountered with the conventional means, and its object is to provide a new means which enables to easily perform the loading of columns for transportation in an orderly manner by eliminating the need for an auxiliary joint member having been heretofore mounted to each column before the delivery and also to use a straight material with no joint portion for a beam by making it possible to join the beam to the column by means of connection with bolts.
In the present invention, there is provided a construction method of joining a column and a beam in a building structure based on heavy-weight steel frame construction for attaining the above object, and this construction method comprises the steps of setting upright a square sleeve formed by a steel material in the shape of a box and/or square cylinder on the center of the upper surface of a base plate formed by a steel material in the shape of a plate in a posture of extending an axis in a vertical direction to integrally connect the square sleeve to the center of the upper surface of the base plate by welding, placing the base plate to the upper surface of a constructed footing through anchor bolts, inserting the lower end side of a square column pipe formed by a steel material in the shape of a square pipe into the square sleeve on the upper surface side of the base plate, tying the square column pipe and the square sleeve in a temporary tightening state with connecting bolts inserted into bolt holes provided in the square column pipe and also bolt holes provided at predetermined positions of the wall surface of the square sleeve, bringing an end plate formed by a steel material into contact with the wall surface of the square sleeve by making it condition that the end plate is preliminarily welded to the longitudinal end surface of a beam as one body, and fastening the end plate to the square sleeve with the connecting bolts to join the beam to the column.
In the construction method of joining the column and the beam both serving as main parts of steel frame structural material in the case of constructing the building structure on the basis of heavy-weight steel frame construction according to the present invention, a column base part needs the following structural members for the execution of this construction method, that is, the base plate formed by the steel material in the shape of the plate and placed to the upper surface of the constructed footing with anchor bolts, the square sleeve formed by the steel material in the shape of the box and/or square cylinder and set upright on the upper surface of the base plate in the manner of integrally connecting the square sleeve to the base plate by welding, the square column pipe formed as a column by the steel material in the shape of the square pipe smaller in diameter than the square sleeve, and the end plate formed by the steel material and preliminarily welded to the longitudinal end of the beam as one body in a posture of being accurately orthogonal to the longitudinal direction of the beam. The base plate with the square sleeve welded to its upper surface is mounted to the upper surface of the constructed footing and is then placed in position thereto with the anchor bolts, and the square column pipe serving as the column is inserted Into the square sleeve in the dropping manner.
In the square sleeve, bolt holes as many as the positions calculated on the basis of a structural calculation are preliminarily provided at the calculated positions of the wall surface to permit the insertion of the connecting bolts for connecting the end plate preliminarily welded as one body to the end of the beam to a predetermined position of the wall surface of the square sleeve, and the connecting bolts are inserted into these bolt holes in the temporary tightening state.
Then, the column and the beam in the column base part are joined by the steps of bringing the end plate preliminarily welded to the end of the beam into contact with the predetermined wall surface out of four wall surfaces of the square sleeve, into which the lower end of the square column pipe is preliminarily inserted in the dropping manner, and then inserting the temporarily-tightened connecting bolts into the bolt holes provided in the end plate at positions corresponding to the bolt holes provided in the wall surface of the square sleeve to tighten the connecting bolts with the nuts.
In a column middle part, the square sleeve, the square column pipe and the end plate preliminarily welded to the longitudinal end of the beam are used for the structural members. In this case, the square sleeve is used as an independent member without the need for the base plate.
After the process of fitting the square sleeve around the circumference of a joint portion between the upper end of the square column pipe for a lower floor and the lower end of the square column pipe for an upper floor to temporarily tighten the square sleeve to the upper and lower square column pipes with the connecting bolts, the column and the beam in the column middle part are joined by the steps of bringing the end plate preliminarily welded to the beam serving as a ceiling beam or an upper beam into contact with the outer wall surface of the square sleeve, and then inserting the temporarily-tightened connecting bolts into the bolt holes provided in the end plate to tighten the connecting bolts with the nuts.
In the construction method of joining the column and the beam, particularly in the construction method of joining the column and the beam in the column base part, a base isolation pad is sometimes interposed between the base plate and the upper surface of the footing in the case of placing the base plate with the square sleeve welded as one body thereto to the upper surface of the constructed footing to fasten the base plate to the footing with the anchor bolts.
Further, it is effective to insert the lower end of the square column pipe into the square sleeve set upright on the upper surface of the base plate fastened to the upper surface of the footing directly or through the base isolation pad by making it condition that the connecting bolts are preliminarily inserted in the temporary tightening state into
Browdy and Neimark
Chavez Patrick J.
Friedman Carl D.
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