JPH063043B2 - PC beam-column joint structure - Google Patents

Description

Detailed Description of the Invention [Industrial applications]

The present invention relates to an improvement of a PC-column joint structure in which a PC column and a PC beam are continuously arranged via a panel zone.

[Prior art]

An example of this type of PC beam-column joint structure is, for example, Japanese Patent Publication No. 62-
The structure described in Japanese Patent No. 32299 has the following configuration. In the stigma of the PC column, steel fiber reinforced concrete is placed in a panel zone divided by each end of a plurality of PC half-beams, and a column-beam joint reinforcing strip (publication instruction code 2) surrounds the column main bar. It is buried under the condition that The exposed end of each lower end streak of the plurality of PC half-beams is bent and erected upward at a right angle in front of the center line of the pillar in the panel zone, and the one of the bent and erected parts located outside is bent. The concrete in the panel zone is locally constrained by being surrounded by beam reinforcement anchor reinforcement strips (publication reference code 3). Further, the pair of the bent upright portions are surrounded by closed loop streaks (publication reference numeral 4) to further locally reinforce the concrete in the panel zone.

[Problems to be Solved by the Invention]

However, in this PC column-beam joint structure, the upper and lower PC columns are different in the characteristics such as bending resistance from the concrete placed in the panel zone, and therefore the main pillars that penetrate the placed concrete are Although it is continuously connected via the concrete, its integration with the cast concrete is not always sufficient. Therefore, the conventional PC-column joint structure as described above is particularly suitable for PC columns and PC beams in high-rise buildings. It was hard to say that it was more than sufficient to withstand the demand for strong integration. The present invention introduces a series of prestresses into the upper and lower solid PC columns and the panel zone pouring concrete to firmly integrate them and significantly improve the strength.
An object is to provide a column-beam joint structure.

[Means for Solving the Problems]

That is, the present invention is a PC column-beam joint structure in which a PC column and a PC half-beam are continuously arranged via a panel zone, and a sheath is embedded in upper and lower solid PC columns and panel zone-casting concrete. By tightening and fixing the column main muscles inserted in the sheath, these upper and lower solid P
The present invention relates to a PC column-beam joint structure in which a series of prestresses are introduced into a C column and a panel zone cast concrete. The introduction of the prestress may be carried out by using a part of the main pillar muscles or using all of them.

[Action]

By introducing a series of prestresses in the upper and lower solid PC columns and the concrete in the panel zone between them, the upper and lower solid PC columns and the concrete in the panel zone are firmly integrated. Therefore, the joint between these and the PC beam becomes stronger.

【Example】

The invention will now be described with reference to the illustrated embodiments. Reference numeral 5 denotes a panel zone formed on the stigma of the lower solid PC column 24 by mounting the respective ends of the PC half-beams 29 in the four directions, that is, the front-rear, left-right directions, on the respective rims of the stigma. In the upper concrete placing zone of the 20PC half-beam 29, high-strength non-shrinkable concrete is continuously placed and integrated into the concrete placing zone 20 and the panel zone 5. Reference numeral 38 is a PC floor panel having an end portion placed on the peripheral portion of each PC half beam 29, 21 is the high-strength non-shrinkable concrete continuously cast into the concrete casting zone 20 and the panel zone 5, and the PC It is a concrete floor formed by continuously placing ordinary high-strength concrete on the upper surface of the floor panel 38. The upper solid PC column 24 is established on the concrete floor 21 at a portion corresponding to the panel zone 5 via an adhesive layer 22 such as mortar, and with the lower solid PC column 24 aligned with the center line. . The embedded main reinforcements 26 previously embedded in the outer peripheral portions of the upper and lower solid PC columns 24 have the required lengths at both ends thereof projected into the high-strength non-shrinkable concrete cast in the panel zone 5 to form the same panel. It is connected by a splice sleeve 27 in the zone 5. Reference numeral 10 is a shear reinforcing bar wound around the embedded main bar 26 in the solid PC column 24, and 19 is a shear reinforcing bar wound around the embedded main bar 26 via the splice sleeve 27 in the panel zone 5. 6 is the buried main bar 2 of the upper and lower solid PC columns 24
A column sheath that is embedded in advance in the inner portion of 6 is a panel zone sheath that is embedded in the high-strength non-shrinkable concrete in the panel zone 5. 25 is a sheath insertion column main bar, and this sheath insertion column main bar 25
Is inserted into the column sheath 6 and the panel zone sheath 28, penetrates the high-strength non-shrinkable concrete of the upper and lower solid PC columns 24 and the panel zone 5 between them, and is fixed with a required tension force. However, a predetermined prestress is introduced into these. With the introduction of this prestress, a high-end PC pillar 24
And the lower solid PC columns 24 are firmly integrated with the high-strength non-shrink concrete cast in the panel zone between them, which is the most important point of the present invention. Reference numeral 23 indicates a fixing material such as mortar injected into the column sheath 6 and the panel zone sheath 28. Next, 30 is a lower end streak embedded in the lower part of the PC half-beam 29 in advance. In the lower part of the concrete, they are integrally connected by enclosed welding or gas pressure welding (pressure welding knob 31). The lower end streak 30 is inserted into the sheath embedded in the lower part of the PC half beam 29 and is fixed in a state in which a predetermined tension is applied, thereby introducing an eccentric prestress to the PC half beam 29. In this state, the ends may be integrally connected as described above. Reference numeral 33 is an upper surface separation position of the PC half beam 29, in other words, an upper end streak which is arranged in the concrete placing zone 20 and is embedded in the high-strength non-shrinkable concrete. The ends of the respective upper end streaks 33 of 29 are integrally connected to each other at the upper portion of the high-strength non-shrinkable concrete in the panel zone 5 by enclosed welding or gas pressure welding (pressure welding hump 34). Reference numeral 15 is a stirrup wound around the outer periphery of the arrangement of the upper end portion 33 and the lower end streak 30. In this embodiment, the PC half beam 29 has a half span length corresponding to half of one span between columns, and
It is assumed that the solid PC columns 24 are extended in four directions, that is, in the front and rear and in the left and right, and the PC half beams 29 that are similarly extended from the adjacent PC columns 24 and the lower end streaks 30 of each other in the central portion of one span. It is connected by enclosing welding 32. However, the upper end streak 33 is one span. However, it is clear that the PC half beam 29 is not intended to be limited to a half span length and may be one span length.

【The invention's effect】

As is clear from the above description, according to the present invention, the upper and lower solid PC pillars, the panel zone casting concrete, and the main pillars of the pillars inserted through the embedded sheath are tightened and fixed to enhance the upper and lower solid pillars. Since a series of prestresses are introduced into the PC columns and the panel zone cast concrete, the upper and lower solid PC columns and the panel zone cast concrete have the same characteristics such as bending resistance and are solidified. They are integrated, and their strength is remarkably improved, and the joint between these and the PC half-beam is further strengthened. Therefore, the PC beam-column joint structure of the present invention is effective for application to high-rise buildings.

[Brief description of drawings]

The drawings show an embodiment of the present invention. FIG. 1 is a vertical front view, FIG. 2 is a cross-sectional plan view, and FIG. 3 is a plan view of an example of arrangement in a high-rise building. 24: solid PC column, 29: PC half beam, 5: panel zone, 6: column sheath, 28: panel zone sheath, 25: column main bar.

Claims (1)

[Claims] 1. In a PC-column joint structure in which a PC column and a PC half-beam are continuously provided via a panel zone, a sheath is embedded in the upper and lower solid PC columns and the concrete poured into the panel zone, and the sheath is formed. A PC-beam joint structure characterized by introducing a series of prestresses to the upper and lower solid PC pillars and the panel zone concrete, by tensioning and fixing the main pillars inserted in the.