JPS5824044A - Construction of prestressed concrete building - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of constructing a multi-story building with a primarily rectangular or annular plane using prestressed concrete.

Until now, in prestressed concrete buildings, when prestress was introduced into reinforced concrete cast-in-place beams, secondary bending stress was generated in the columns, and there was a problem with this process. In the case of an assembly type using precast concrete or prestressed concrete members, there are problems with the joints between the columns and beams, and in earthquake-prone countries like Japan, these joints are rigidly connected to reduce the axial force and In addition to shear stress, bending stress and sometimes torsional stress must be transmitted, which requires the use of shoring materials, pouring concrete IJ at joints, and repeatedly introducing prestress after hardening. This required additional work and a separate construction period. In addition, when using load-bearing walls made of precast-7 concrete panels in the direction of the girder, there is often a limit to the floor height, and in terms of seismic strength, unless the wall beams are made thicker, increasing the beam length will result in openings. There was some frustration that he was not able to earn a high enough score to pass through the division. In addition, in order to handle the horizontal shear force between the eyebrows during an earthquake, special measures such as the installation of joints and joints are required, and the waterproof joints at the joints of these panels are
It was treated by fitting Gaskent and caulking. The present invention aims to solve these problems, simplify the joining and construction of members, and improve seismic performance.

This invention consists of a precast concrete rectangular frame with a prestressed concrete beam and half columns at both ends.The half columns of the rectangular frame are adjacent to each other to form a single column, and they are arranged in two rows facing each other. The girders are placed on top of these pillars, and the column parts of the rectangular frames are then placed on top of the girders. A steel rod is passed through the frame, prestressed, and crimped to each other to form a multilayer frame in the direction between the beams.
At the same time, the two half-columns of the rectangular frame are indirectly connected by crimping and fixing them to the girder, and the whole frame forms a multilayer frame wall surface in the direction of the girder. At this time, the upper girder of the rectangular frame is inside and above it. The method of constructing prestressed concrete structures is characterized in that the lower girder of the rectangular frame of the floor is stacked horizontally and parallel to the outside.

Embodiments of the invention will be described with reference to the drawings. On top of two adjacent sets of precast concrete A-shaped frames 2 (D), a large prestressed concrete beam 1 is placed on top of each half column 4 at the end, and a steel rod 7 is passed through these, and after prestressing is introduced, the cover is Further connect and extend the steel rod, then pass it through the half column of the precast concrete frame, place a prestressed concrete girder on top of this, and introduce prestress through the entire steel rod in the same way.Hereafter, these steps are repeated and piled up to the upper layer. During this time, the holes through which the steel rods were passed were grouted, and flooring materials such as prestressed concrete were connected to each other on top of the girders, and then connected to the girders to form a single body, creating a rigid floor on each layer. .

Although the present invention has been described above with reference to embodiments, it is not limited to such embodiments, and various design modifications can be made without departing from the spirit of the present invention.

This invention has the following effects.

(Column 11 consists of two half-columns, and the upper and lower ends are crimped and fixed to the girder and are indirectly connected to each other, so the width of the column in the direction of the girder is halved, and it is possible to avoid shortening the column in the event of an earthquake.) , shear failure due to horizontal shear force in the direction of the girder can be avoided.

(2) The girder is fitted between the rectangular frames on both sides of the column below it, and also between the rectangular frames on both sides of the column above it, so that during an earthquake, the girder resists the interstory horizontal shear force in the direction of the girder. This function also prevents torsional stress from occurring on the girder itself.

(3) Construction methods are already known in which external wall panels with columns are installed in the direction of the girders, and girders are installed in the direction of the beams, and by using prestressed concrete girders, which are particularly advantageous for large spans, the central columns and their By omitting both the middle beams that connect the beams, it is possible to change the types of members, and it is also possible to avoid complicated construction methods such as joining columns with copper above and below the intersection of the beams.

(4) Since the upper and lower girders of the rectangular frame overlap horizontally in parallel with the lower girder on the upper floor and the upper girder on the lower floor, the internal height of the opening can be increased by the amount of overlap.

(5) The rectangular frame is protected against wind and rain from the outside by attaching sashes, doors, etc. to the openings, but at the upper and lower joints, the upper girder is placed inside and the lower girder is placed outside, so there is sufficient room for the weight of the girder. It is easy to waterproof.

(6) When stacking precast concrete rectangular frames and prestressed concrete girders alternately, there is sufficient column width in the direction between the beams, and the height of the lower end of the column, which is the fulcrum, is above the lower girder and close to the center of gravity, so it is stable. This allows the rectangular frame to stand on its own, making erection easy.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and the first drawing is an elevational view;
FIG. 2 is a plan view, FIG. 1 is a sectional view taken along the line A--A in FIG. 1, and FIG. 1... Prestressed concrete girder 2 - Precast concrete rectangular frame with half columns at both ends... Prestressed concrete floor material J1... Half columns 5 at both ends of precast concrete rectangular frame - Precast I concrete rectangular frame. Two digits 6...Lower digit of precast concrete rectangular frame Patent applicant: Nissan Construction Co., Ltd.

Claims (1)

[Claims] It consists of a prestressed concrete girder (1) and a precast concrete A-shaped frame (2) with half columns at both ends.The half columns of the rectangular frame are adjacent to each other to form a single column, and they are opposed They lined up in two rows, passed girders on top of these pillars, and then placed the column parts of the rectangular frames on top of the girders, stacking the rectangular frames alternately with the girders. Steel bars, etc. are penetrated in the vertical direction, prestress is introduced, and they are crimped and fixed to each other to form a multi-layered frame as a whole in the direction between the beams, and at the same time, the two half columns of the rectangular frame are each crimped and fixed to the girder. The upper girder of the rectangular frame is stacked horizontally in parallel, with the upper girder of the rectangular frame on the inside and the lower girder of the rectangular frame on the upper floor on the outside. A method for constructing a prestressed concrete building characterized by: