JPH03153309A - Manufacture and joining method for pc pillar - Google Patents

Abstract

PURPOSE:To enable joining of a PC pillar at the central part of the pillar, by a method wherein a plurality of pillar main reinforcing rods and hoop reinforcing rods are arranged to respective shutterings, the pillar main reinforcing rods are connected temporarily with each other, demolding is performed after placing of concrete into the respective pillar shutterings for curing and connection of the pillar main reinforcing rods are released. CONSTITUTION:Pillar shutterings 1 are assembled by dividing them into 2-3 pieces longitudinally and arranged at fixed intervals in a line laterally and horizontally. A plurality of pillar main reinforcing rods 2 and hoop reinforcing rods are arranged into the pillar shutterings 1. Continuously, the pillar main reinforcing rods 2 are fixed reliably by fitting end shutterings 4 respectively to edge parts of the pillar shutterings 1 each. Protrusions of the pillar main reinforcing rods are connected temporarily by a coupler 3 with each other further. Temporary stays 5, slant reinforcement materials 6 are connected temporarily by couplers 7 respectively with each other. Concrete 9 is placed respectively into the pillar shutterings 1 and cured sufficiently. The pillar shutterings 1 and end shutterings are removed respectively. Then the temporary stays 5 and slant reinforcement materials 6 are separated from each other by removing the couplers 7 of the connecting parts between the temporary stay 5 and slant reinforcement materials 6.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for manufacturing a PC column and a method for joining the same.

[Conventional technology]

In recent years, main structural members such as columns and beams of reinforced concrete structures are often converted to so-called PC.

By converting the main structural members to PC, it is possible to cast concrete with extremely high reliability through factory production.
This is preferable because quality can be improved and on-site construction can be omitted, which can significantly shorten the construction period.

By the way, the columns are made of PC over their entire length on each floor, and the PC columns on the upper and lower floors are generally joined together with the PC beams using cast-in-place concrete at the joints with the beams.

However, the joints between columns and beams are subject to excessive shearing forces and bending moments during earthquakes, and although they are extremely important structurally, reinforcing bars may be intertwined within a narrow space. , it is quite difficult to place concrete with high reliability.

For this reason, a method has been developed in which the joints between columns and beams are made of PC, and the PC columns are joined at the center of the pillars instead of at the joints, and 2.3 has also been implemented.

According to this method, since the concrete for the joint part can be placed in a factory, highly reliable concrete can be placed and the quality can be improved.

In addition, the reinforcing bars in the center of the column are arranged very simply, so
This part can be constructed with cast-in-place concrete much better than the joint part, so there is no need to worry about quality deterioration.

Furthermore, since the moment at the center of the column is much smaller than that at the column-beam joint, it is extremely advantageous from a structural point of view to provide a joint in this area.

[Problem to be solved by the invention]

However, such a joining method has several problems that pose a bottleneck in construction, and has not been widely implemented.

In other words, one of the issues that needs to be solved is that unless the main column reinforcing bars in the PC company are placed in accurate positions so that they perfectly match the top and bottom, it is extremely difficult to join the top and bottom PC column parts in a perfectly matching state. That's true.

Another problem is that immediately after joining, the upper and lower PC columns are joined only by in-house main reinforcement, so for safety reasons, it is difficult to move on to the next process such as erection of the PC beams until the concrete at the joint has sufficient strength. Therefore, it is inevitable that the construction period will be prolonged.

This invention was proposed in order to solve the above-mentioned conventional problems, and it is possible to manufacture PC columns that can be joined at the center of the pillars and that can be joined extremely easily. The object of the present invention is to provide a method and a joining method thereof.

[Means to solve the problem]

The present invention relates to a method for manufacturing a PC column and a method for joining the same, in which the column form of the PC column is assembled by dividing it into a plurality of parts in the longitudinal direction, and the plurality of column forms are installed in a horizontal row at predetermined intervals. Then, a plurality of column main reinforcements and hoop reinforcements are arranged in each of the formworks, the column main reinforcements are temporarily connected, and then concrete is poured and cured in each of the column formworks. to demold the column formwork, and then release the connection of the column main reinforcement to manufacture a PC column, and
PC columns are stacked one on top of the other, the upper and lower PC columns are connected by multiple temporary supports and diagonal reinforcement, the main reinforcements of both columns are joined, multiple hoop reinforcements are arranged around it, and the hoop The above objective is achieved by installing a formwork outside the reinforcement and subsequently pouring concrete into the formwork to join the upper and lower PC columns.

〔Example〕

The present invention will be described below based on an illustrated embodiment.

First, a method for manufacturing a PC pillar will be explained step by step.

■ Column formwork1. 1 is divided into two or three parts in the longitudinal direction and assembled into a cylindrical shape with a rectangular or circular cross section, and each assembled column form frame 1. 1 are arranged horizontally in a row at predetermined intervals.

In such a case, a sufficient distance between the column forms 1 and 1 should be ensured to enable work such as joining the column main reinforcing bars and temporary supports, which will be described later.

■ Next, install multiple column main reinforcements 2.2 in the column formwork 1.1.
and hoop reinforcements (not shown) are arranged, and both left and right ends of the column main reinforcements 2.2 are made to protrude a predetermined length from both ends of the column formwork 1.1 into the gap between the column forms 1 and 1.

Further, the main column reinforcements 2, 2 are arranged at the same position in each column formwork 1.1 so as to be continuous in one horizontal row.

(2) Next, the column main reinforcements 2, 2 are securely fixed by attaching the gable forms 4°4 to the ends of each column formwork 1, 1, respectively.

Furthermore, the protruding parts of the column main reinforcements 2.2 are temporarily connected by couplers 3.3.

■ Subsequently, temporary supports 5.5 and diagonal reinforcements 6.6 are protruded from each end formwork 4.4, and the temporary supports 5 and 5 and diagonal reinforcements 6 and 6 are temporarily attached using couplers 7.7. Connect to.

The temporary strut 5.5 uses a slightly thick male threaded member so that it can be easily connected and separated using a threaded coupler.
Further, the proximal end side thereof is fully inserted into the column formwork 1.1 so as to be integrally fixed in concrete, which will be described later, and an anchor reinforcing bar 8.8 is provided in a protruding manner.

Similar to the temporary struts 5.5, the diagonal reinforcing members 6, 6 are also male threaded so that they can be easily connected and separated using threaded couplers.

Incidentally, the diameter and number of the temporary struts 5 and diagonal reinforcing members 6 shall be appropriately increased or decreased depending on the scale of the PC column to be manufactured.

■ Continuously, concrete 9 is poured into each column formwork 1.1 and sufficiently cured.

■Subsequently, when the concrete 9 in the column formwork 1.1 has developed sufficient strength, the column formwork 1 and the gable formwork 4 are respectively removed.

Further, the coupler 7 at the connecting portion of the temporary support 5 and the diagonal reinforcement 6 is removed to separate the temporary support 5.5 and the diagonal reinforcement 6.6.

Through the above steps, the PC pillar l can be molded into an upper part and a lower part with the central part as a boundary.

Next, a method for joining the upper and lower parts of the PC pillar will be described.

(2) Layer the upper part IB on the lower part IAO of the PC column 1, and integrally connect the corresponding upper and lower column main reinforcements 2 and 2 and temporary struts 5 and 5 by coupler joints 3 and 7 or weld joints.

In such a case, the diameter, number, etc. of the temporary struts 5 and diagonal reinforcement members 6 shall be determined so that they have sufficient strength to support the 20 members such as columns and beams and construction materials located above them.

(2) Next, the necessary number of hoop reinforcements 10 are arranged around the column main reinforcements 2.2, and formwork 11 is installed outside of them to completely surround the joint.

■ Next, concrete 12 is poured into the formwork 11, and when the concrete 12 has developed sufficient strength, the formwork 11 is poured.
to be removed.

Through the above steps, the lower part IA and the upper part IB of the PC pillar 1 are
can be completely joined together.

〔Effect of the invention〕

Since the present invention has the above configuration, it has the following effects.

■ According to the method of manufacturing a PC column according to the present invention, the main reinforcement of the column can be extremely precisely placed at a predetermined position, and the joints with the beams can also be cast in the factory. It is possible to improve the quality of PC pillars and also improve construction accuracy.

■ When joining PC columns, the upper and lower parts of the PC columns are not only connected by the column main reinforcement, but also by temporary supports and diagonal reinforcement, so it is difficult to connect the concrete immediately after pouring before it develops sufficient strength. You can move on to the next task immediately, significantly shortening the construction period.

[Brief explanation of the drawing]

Fig. 1 is a side view showing a joint between a column and a beam, showing a conventional joining method for PC columns, and Figs. 2 to 7 show an embodiment of the present invention. Figure 3 is a side view of the column formwork showing the method for manufacturing the PC pillar, Figures 4 to 7 show the joining method, and Figure 4 shows the joining method. 5 is a perspective view thereof, FIG. 6 is a side view of the state before joining, and FIG. 7 is a side view after joining. 1... Column formwork, 2... Column main reinforcement, 3... Coupler joint, 4... Gable formwork, 5... Temporary support, 6... Diagonal reinforcement, 7... Coupler Joint, 8... Anchor reinforcing bar,
9... Concrete, 10... Hoop reinforcement, Figure 1 Figure 6 Figure 7

Claims (2)

[Claims] (1) The formwork for a PC column is assembled by dividing it into multiple parts in the longitudinal direction, and the plurality of formworks are installed in a horizontal row at predetermined intervals, and each of the formworks is equipped with a plurality of column main reinforcements. Hoop reinforcement is arranged, the column main reinforcements are temporarily connected, concrete is poured and cured in each of the formworks, the formwork is demolded, and the column main reinforcements are connected temporarily. A method for manufacturing a PC pillar, characterized by releasing a joint part. (2) Layer the PC columns one above the other, connect the upper and lower PC columns with multiple temporary supports and diagonal reinforcement, join the main reinforcements of both columns, and arrange multiple hoop reinforcements around them, A method for joining PC columns, the method comprising: installing a formwork outside the hoop reinforcement, and then pouring concrete into the formwork.