JPH0517338B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <<Industrial Application Field>> The present invention relates to a method for connecting precast concrete columns.

<<Prior Art>> Significant progress has been made in recent years in the construction and construction methods of reinforced concrete structures, and among them, the progress in prefabricated construction methods aimed at shortening the construction period has been remarkable. Figure 4 shows a method of connecting precast concrete columns, which is a type of prefabricated construction method.
and 2 indicate precast concrete columns, and these concrete columns 1 and 2 are connected as follows.

In other words, a steel mandrel pre-planted at the top end of concrete column 2 is attached to another concrete column 1.
is inserted into the hole 4 formed at the lower end, and then the butt ends 7 of the main reinforcements 5, 6 of both concrete columns 1, 2 are interconnected by welding or sleeve joints, etc.
Finally, the joint recess 8 of both concrete columns 1 and 2 is filled with mortar 9 to connect the concrete columns 1 and 2.

<<Problems to be Solved by the Invention>> Conventional precast concrete columns have been connected, for example, as described above, but the following problems have been pointed out with this connection method. In other words, the conventional connection method involves inserting the mandrel 3, main reinforcement 5,
Since the process consists of a total of three steps: connecting 6 and filling mortar 9, it takes a relatively long time for the connection work. Further, the mandrel 3 is mainly used to prevent the concrete columns 1 and 2 from shifting laterally, and cannot be expected to have sufficient strength against bending of the concrete columns 1 and 2. For this reason, even if the connection work is completed, the concrete columns 1 and 2 are unstable until the mortar 9 dries, and the concrete columns 1 and 2 that extend upward
Continuous connection construction (2) naturally involved time constraints, and the advantages of the prefabricated construction method tended to be somewhat diminished.

The present invention has been devised to effectively solve the above-mentioned problems, and its purpose is to be able to complete the connection of precast concrete columns in a relatively short time, and to connect the precast concrete columns as soon as the connection is completed. The object of the present invention is to provide a method for connecting precast concrete columns that can be expected to have sufficient bending strength at the parts.

<<Means for Solving the Problems>> The present invention for solving the above-mentioned problems includes integrally forming a concrete tenon at the end of one precast concrete column, and forming a tenon of concrete at the end of the other precast concrete column. A mortise is formed at the end, main reinforcements are exposed on the surfaces of the tenon and tenon, and after the tenon is fitted into the tenon, adhesive is press-fitted into the fitting surface. This is what I did.

<<Operation>> In the method for connecting precast concrete columns configured as described above, since the tenon of the concrete that is integral with the column fits into the mortise, the bending strength at the connection section of the column is greatly improved. In addition, by press-fitting the adhesive, the adhesive spreads to the fitting surface of the tenon and the tenon, and this adhesive interconnects the main reinforcement on the outer surface of the tenon and the main reinforcement on the inner surface of the mortise.
Therefore, there is no need for the conventional work of connecting the main reinforcements to each other, and together with the ease of construction due to the improved bending strength at the connection points mentioned above, it is possible to connect concrete columns that extend upward in a very short period of time. It will be possible to complete it.

<<Example>> An example of the present invention will be described below based on the drawings.

As shown in FIG. 1, the precast concrete columns 11 and 12 used in the present invention have a tenon 13 extending in the longitudinal direction at one end thereof, and a tenon at the other end into which the tenon 13 can fit. It has 14.

The thickness D of the tenon portion 13 corresponds to the width between the main reinforcements 16 to 16, so that the main reinforcement 16 is exposed on the outer surface of the tenon portion 13. On the other hand, the main reinforcement 15 is similarly exposed on the inner surface of the mortise 14.
When the tenon part 13 is fitted into the mortise hole 14, the main reinforcement 1
5 and 16 are arranged adjacent to each other. Note that the length L of the tenon portion 13 is the main reinforcement 15, 16.
If the diameter of L is about 40d, the required connection strength between the main reinforcements 15 and 16, which will be described later, will be satisfied, and the required stability of the connection portion will be obtained.

In Fig. 1, reference numeral 10 denotes a hoop reinforcement, and when this hoop reinforcement 10 is installed at the mortise section 13, it is either placed inside the main reinforcement 16 and welded to the main reinforcement, or the hoop reinforcement is attached to the mortise section 13. 14 side, and when inserting the tenon part 13 into the mortise hole 14, the hoop muscle 1
It is best to keep 0 out of the way.

The precast concrete columns 11, 12 are constructed as described above, and the concrete columns 11, 1
2 are connected in the following steps. First, with respect to the concrete pillar 12 erected at a predetermined position, another concrete pillar 11 is lifted up by a crane or the like and lowered vertically in the direction of arrow a as shown in FIG. 13 is relatively inserted and fitted into the mortise hole 14 of the upper concrete column 11. Next, an adhesive such as mortar is press-fitted from the connecting joints 17 of the upper and lower concrete columns 11 and 12, and the mortar is spread over the fitting surfaces of the tenons 13 and mortises 14.

This completes the construction of connecting the concrete columns 11 and 12, but in the present invention, the tenon part 13 is connected to the column 1.
2, the required stability or bending strength at the joint between both concrete columns 11 and 12 is satisfied when the tenon part 13 is fitted into the mortise hole 14, and as a result, the concrete column It becomes possible to connect further concrete columns almost continuously on top of 11. Moreover, since the main reinforcements 15 and 16 exposed on the surfaces of the tenon part 13 and the tenon 14 are connected to each other by press-fitted mortar, the main reinforcements 15 and 16 as in the conventional case are
16 No need for mutual manual connection process,
It becomes possible to significantly reduce the construction period and construction cost.

Next, a prefabrication method for a reinforced concrete structure to which the present invention is applied will be explained with reference to FIGS. 2 and 3. Figure 2 shows the reinforced concrete unit 18 with integrated columns and beams used in this prefabricated construction method.
It is. The column portion 18a of this unit 18 is constructed in the same manner as the precast concrete columns 11 and 12 described above, and has a tenon portion 13 formed at its upper end and a mortise hole 14 at its lower end. On the other hand, the beam portion 18b of the unit 18 is
Four beams protrude in a cross shape from near the upper end of the beam 18b, and a relatively small tenon portion 19 or tenon receiving groove 20 is formed at the tip of each beam portion 18b.

Figure 3 shows the unit 18 mentioned above, up and down, left and right.
The pillars 18a of each unit 18 are connected to each other by a tenon 13 and a mortise 14, and the beams of each unit 18 are connected to each other by being arranged continuously in three directions, front and back. 18b are interconnected by a tenon portion 19 and a tenon receiving groove 20. A floor plate 21 is disposed in a square area surrounded by a plurality of beam parts 18b, and the four sides of this floor plate 21 are supported by each beam part 18b.

As mentioned above, if the present invention is developed and applied as shown in Unit 18, reinforced concrete structures can be prefabricated or made into units, and the construction period can be shortened and construction costs can be reduced through labor saving or mechanization of construction work. becomes possible.

Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment and can be modified in various ways. For example, in the above embodiment, the tenon part 13 was formed at the upper end of the concrete columns 11, 12, and the mortise hole 14 was formed at the lower end part, but this was done in consideration of the infiltration of rainwater etc., and is not necessarily necessary. In some cases, a mortise is formed at the upper end of the concrete pillars 11 and 12.
A tenon portion may be formed at the lower end.

<<Effects of the Invention>> As described above, the present invention forms a concrete tenon at the end of one precast concrete column that is integral with the column, and forms this tenon at the end of the other precast concrete column. Since a fittable mortise is formed and the tenon is fitted into the tenon of another concrete column to connect the columns, the stability or bending strength of the connection is determined by the tenon of the concrete. This can greatly improve the ease of erection, and the main reinforcement exposed on the surface of the tenon and tenon can be used to improve the fit between the tenon and the tenon. Since they are connected to each other using adhesive that is press-fitted into the surfaces, the complicated connection work between the main reinforcements can be omitted.This, together with the ease of construction mentioned above, makes it possible to create a continuous structure of concrete columns that extend upward. This makes it possible to complete connection work in an extremely short time.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view of a precast concrete column showing an embodiment of the present invention, Fig. 2 is a perspective view of a reinforced concrete unit to which the present invention is applied, and Fig. 3 is a perspective view of the unit in the construction state. Moreover, FIG. 4 is a longitudinal cross-sectional view of a conventional precast concrete column. 11, 12... Precast concrete column, 13... Tenon, 14... Mortise, 15, 1
6...Main reinforcement, 17...Connection joint.

Claims (1)

[Claims] 1. In a precast concrete column connection method that connects a plurality of precast concrete columns to each other in the longitudinal direction, a concrete tenon extending in the longitudinal direction is integrally formed at the end of one precast concrete column. At the same time, a mortise hole into which the tenon part can be fitted is formed at the end of the other precast concrete column, and column main reinforcements are exposed on the outer surface of the tenon part and the inner surface of the tenon part, respectively, and the tenon part is fitted into the tenon part. After fitting the tenon into the mortise, an adhesive is press-fitted from the connecting joint of both precast concrete columns, and the fitting surfaces of the tenon and the tenon are bonded with the adhesive. How to connect precast concrete columns.