JPS5812426B2 - How to connect columns and beams using PC steel bars - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a method of connecting columns and beams using PC steel bars.

When building an accurate structure by joining precast members, it is not very difficult to manufacture precast members with the required precision, but the structure and construction method of the connecting part is difficult. Therefore, conventionally there has been a difficulty in constructing a complete structure having the required accuracy, and improvements have been sought.

The aim of the invention is to eliminate the disadvantages inherent in such conjugates.

The gist of the present invention to achieve the above object is as stated in the claims set forth in the header.

The present invention will be described in detail below with reference to embodiments illustrated in the drawings.

FIG. 1 is an external view of a part of a structure constructed by combining a column member 1 made of precast concrete and a beam member 2 also made of precast concrete and fastened together with PC steel rods.

FIG. 2 is a diagram showing the column member 1. As shown in FIG.

The upper and lower ends, each indicated by reference numeral 3, have a rectangular cross section, and the intermediate portion 4 is provided with notches indicated by reference numeral 5 at the four corners.

This notch 5 is a space for inserting a PC steel rod or installing a small jack to fully tension the PC steel rod.

Also, in the four corners of the end part 3 are holes 6 for passing the PC steel rod.
is provided.

Further, in FIG. 2, protrusions indicated by the reference numeral 7 are provided on both end faces of the column member 1, but this is merely an example, and any packing material may be used as long as it is made of relatively hard packing material.

FIG. 3 is a diagram showing the beam member 2. As shown in FIG.

Since both end portions 8 will form part of the column after being combined, their planar shape is made to match the cross-sectional shape of the column member 1, and holes 9 are drilled at the four corners for passing the PC steel rod. There is.

This hole 9 is located in the same position as the hole 6 in FIG.

The structure of the constituent members is as described above, and the construction method will be explained below.

FIG. 4 shows the column member 1 installed on the existing foundation 10.

The lower end of the PC steel rod 11 is embedded in the concrete of the foundation 10 and anchored in advance at a fixed position. PC@
The upper part of the rod 11 stands bare on the foundation surface, and the column member 1
While lowering the PC steel rod 11 from above, insert it into the hole 6,
Grate completely.

After adjusting the horizontal position of the column member 1, fine adjustment in the vertical direction can be completely performed by tightening or loosening the nuts of the PC steel bars at the four corners.

After this, the gap 12 is completely filled with dry mortar, the main tension is applied with a jack, and the foundation 1 is fixed.
0 and the column member 1 are rigidly connected.

FIG. 5 is a diagram showing a method of constructing the intermediate layer portion.

The column member 1 at the lower end is already rigidly connected to the structure below it.

The beam member 2 is placed on top of it, and the horizontal position is adjusted.Furthermore, the column member 1 at the upper end is placed on top of it, and the horizontal position is adjusted.

Next, the PC steel rod 13 is passed through and the nuts are tightened or loosened as before to make fine vertical adjustments of both parts 1 and 2.

Thereafter, after the gap 14 is completely filled with dry mortar, main tension is applied using a jack to rigidly connect each member.

FIG. 6 is a diagram showing a method of constructing the uppermost layer.

In this case, since there is no column member at the upper end in the case shown in FIG. 5, it is sufficient to construct the structure according to the case shown in FIG.

As can be seen from the above explanation, according to the construction method of the present invention, horizontal and vertical adjustments can be made extremely easily and completely at the joint between the column member and the beam member, and therefore the required It has the advantage that it is possible to construct the entire structure with a certain degree of accuracy.

[Brief explanation of the drawing]

Figure 1 is an external view of a part of the constructed structure;
The figure shows a column member made of precast concrete.
FIG. 3 is also a diagram of the beam member. Figure 4 is a diagram showing the state of connection between the foundation and column members, and Figure 5
The figure is a diagram showing the three members of the middle layer, a column member, a beam member, and a column member, combined together, and FIG. 6 is an explanatory diagram showing the state of connection between the beam slope and the column member in the uppermost layer. In these figures, 1... Column member, 2... Beam member, 3
... Upper end and lower end of the column member, 4... Middle part, 5...
Notch, 6... Hole, 7... Projection, 8... Both ends of beam member, 9... Hole, 10... Foundation, 11... PC steel bar, 12
...Gap, 13...PC steel bar, 14...Gap.

Claims (1)

[Claims] 1 The cross-sectional shape of the upper end and the lower end is rectangular, and the middle part has a cross-sectional shape with the four corners cut out, and the above-mentioned upper end and lower end have a rectangular cross-sectional shape at a place near the four corners. A column member 1 is provided with a hole for passing a vertically running PC steel rod, and a protrusion is provided at the center of the upper surface of the upper end, and the planar shape of the upper and lower surfaces of both ends is the rectangular cross section of the upper and lower ends of the column member 1. In addition, near the four corners of the planar shape, there are PCs installed on the column member 1.
When connecting a large number of beam members 2 in an alternating arrangement, each of which has holes for passing the PC steel rods at positions corresponding to the holes for passing through the steel rods, the PC steel rods embedded in the foundation are inserted into the four corners of the column member 1. Install the column member 1 without passing it through the nearby hole, tighten and fix the PC steel rods, and solidify the column member 1 to the foundation. Cross the beam member 2 between them, align the holes for the prestressed steel material, place the column member 1 on top of it, pass the prestressed steel rod between each of these three members, perform temporary tightening, and tighten each member. Columns and beams using PC steel bars, characterized in that the process of adjusting the passage position, filling the gaps with the above protrusions with dry mortar, and tensioning and fixing the PC steel bars is carried out sequentially up to the top layer. How to combine.