JPS6360340A - Joint construction method of pc pillar - Google Patents

Abstract

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

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a joint construction method for PC columns.

(Prior art) As a joint construction method for PC columns, the main reinforcements of the upper PC column and lower PC column are pressed together at the middle part of the column, and then cast-in-place joint concrete IJ-1 is poured, or the column base of the PC column is In this section, the conventional method is to connect the lower end of the column main reinforcement buried in the same PC column and the main reinforcement protruding from the lower structure via a dip joint, and then pour cast-in-place joint concrete. was.

(Problem to be solved by the invention) The former method connects the column at the point where the bending stress is minimum, but after the main reinforcement is pressed, the entire cross section of the column joint is poured with concrete, so it is difficult to connect the column. The area of formwork and amount of concrete will increase.

Furthermore, in the latter method, the bending stress of the column is carried out at the column base where it is greatest, so the work requires a high degree of skill and also requires a large amount of post-cast concrete.

(Means for solving interpolation points) The present invention relates to a joint construction method for PC columns proposed to solve such problems, by installing a splice sleeve in the middle part of the column, and A PC column with a column main reinforcement fixed above and a sheath pipe fixed below is erected on a lower structure so that the main reinforcement protruding onto the structure is fitted into the sheath pipe, and then the sheath is fixed. This problem is solved by injecting grout into the pipe.

(Function) In the present invention, a splice sleeve is installed inside the middle part of the column, and a PC column is used in which the column main reinforcement is fixed above the splice sleeve, and the sheath pipe is fixed below the splice sleeve.
A splice sleeve in which the sheath pipe and the column main reinforcement are temporarily fixed by erecting the PC column on the lower structure so that the main reinforcement protruding from the lower structure is inserted into the sheath pipe of the C column. By this, the lower main reinforcement and the column main reinforcement of the PC column are connected.

In this state, by injecting grout into the sheath pipe, the gap between the sheath pipe and the lower main reinforcement is filled with the grout, the lower main reinforcement is integrated with the PC column, and the splice sleeve is filled with the grout. By doing so, the lower main reinforcement and the column main reinforcement are integrally connected, and thus the PC column is integrally joined to the lower structure.

(Example) The present invention will be described below with reference to the illustrated embodiments.

(N is a PC column, and a splice sleeve (1) is buried and installed in the middle of the column at about 1/3 of the total height, and the column main reinforcement (2) is installed above the splice sleeve (1). ,
A sheath pipe (3) is fixed to the lower part, and each column main reinforcement (2) is fixed to the lower part.
) and the sheath tube (3) are surrounded by a hoop muscle (4).

A grout injection pipe (5) is branched out from the lower part of the sheath pipe (3), and a grout overflow pipe (6) is connected to the splice sleeve (1).

The sheath pipe (3) is fitted onto the mortar (C) of the PC column (A) in the lower structure, and the lower main reinforcement (7) protrudes upward from the lower structure (B). When installed, the upper end of the lower main bar (7) will fit into the splice sleeve (1).
It rushes inward and faces the column main reinforcement (2).

In this state, grout material (8) is injected into the sheath pipe (3) through the grout injection pipe (5), and the grout material (8) is connected to the sheath pipe (3) and the lower main reinforcement (7). Fill the void and the splice sleeve (1) to install the main column reinforcement (
2) and the lower main reinforcement (7) are connected via the splice sleeve (1), and the PC column (A) is integrally joined toward the lower structure.

(D) in the diagram shows the nononel zone, which will be constructed using conventional construction methods.

(Effects of the Invention) As described above, in the present invention, a PC column is used in which the column main reinforcement is fixed above the splice sleeve buried inside the middle part of the column, and the sheath pipe is fixed below. When erecting the column on the lower structure, the lower main reinforcement protruding onto the lower structure is fitted into the sheath pipe, thereby causing the lower main reinforcement and the column main reinforcement to face each other in the splice sleeve, and in this state. By injecting grout into the sheath pipe, the gap between the sheath pipe and the lower main reinforcement is filled with grout to integrate the lower main reinforcement into the PC column, and the splice sleeve is filled with grout. , which connects the lower main reinforcement and the column main reinforcement, thus integrally joining the PC column to the substructure, which greatly simplifies the work of joining the column main reinforcement of the PC column and the main reinforcement of the substructure, and also Since no formwork or concrete is used for the pillars, the use of prestressed columns will be improved.

Further, according to the present invention, both columns are set in a predetermined position at the same time as the PC column is erected in the lower structure, eliminating reinforcement work and improving construction accuracy. Combined with the fact that frames and concrete are not required, construction time is shortened and construction costs are reduced.

[Brief explanation of the drawing]

Fig. 1 is a partially longitudinal sectional front view showing the implementation status of one embodiment of the joint construction method for PC columns according to the present invention, Fig. 2 is a view taken along arrows ■-■ in Fig. 1, and Fig. 3 is a FIG. 4 is a partially enlarged view of the figure, and FIG. 4 is a longitudinal sectional view of the splice sleeve. (A), PC column (B)... Lower structure (1)... Splice sleeve (2)... Column main reinforcement (3)... Sheath pipe (7)... Lower main reinforcement ( 8)... Grout material agent Patent attorney Shige Okamoto 2 other people

Claims (1)

[Claims] A splice sleeve is installed in the middle part of the column, and a PC column with a main column reinforcement above the splice sleeve and a sheath pipe fixed below is placed on the lower structure, and the main reinforcement protruding onto the structure is connected to the sheath. A method for joining a PC column, characterized in that a grout material is injected into the sheath pipe after the PC column is erected so as to be inserted into the pipe.