JPH0782890A - Building method of pc structure - Google Patents

Abstract

PURPOSE:To attain weight reduction of PC members, reduction of transport cost, and shortening of a process, by arranging a PC member of recessed section opening upward on a fitting position, wiring PC cables in the recessed section in an out cable system and tensely joining with fitting members. CONSTITUTION:A girder 2 of precast PC is installed on pillars 1. At this time, the girder 2 is worked into a recessed section, and a diaphragm 3 provided with second cable inserting holes 16 and third cable inserting holes 17 is previously executed. Joint mortar is filled in the joint parts between the pillars l and the girder 2. Next the second cables 4 are wired in the girder 2 and tensely joined with the pillars 1. Next the third cables 5 are similarly arranged. Thereafter precast slabs 7 are installed. Finally cast-in-place concrete 6 is placed in the recessed section as girder concrete. At this time, the girder 2 itself serves as a formwork. Hence, the transport vehicle capacity and weight lifting machine capacity can be reduced, the transport and installation cost can decreased, and the process can be shortened.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of constructing columns, beams, walls, floors and the like of PC-structured buildings.

[0002]

2. Description of the Related Art In a conventional PC structure, a PC cable is laid in the cross section of a member to give prestress in the form of internal stress. In that case, the cross-sectional shape of the member is rectangular, I-shaped, T-shaped.
The cross-section was common. In addition, the joint was integrated by cast-in-place concrete.

[0003]

When constructing a PC structure with cast-in-place concrete, supporting work, formwork, scaffolding, etc. are required, and the process is complicated and the construction period is long. In addition, the conventional solid precast concrete members are heavy in weight, and there are great restrictions on handling such as transportation and lifting.

An object of the present invention is to solve the above-mentioned problems, and while utilizing the characteristics of the PC structure, the weight of the member can be reduced and the PC structure can be easily joined to other members. It develops a construction method and provides it.

[0005]

The present invention is a method for constructing a PC structure characterized by taking the following technical means in order to solve the above problems. That is, according to the present invention, a PC member having a concave cross-section with an open upper surface is manufactured, placed at a mounting position, and then a PC cable is laid in the concave cross-section by an out-cable method. A method for constructing a PC structure, characterized by joining and constructing to a mounting member.

According to the present invention, a PC member for tensioning an out cable having a concave cross section with an open upper surface is formed by a pre-tension or post tension method with a primary cable, and the concave cross section is formed. Inside, the PC cable for joining is divided into secondary and tertiary cables by the out-cable method, and the PC cable is tensioned and joined to orthogonal mounting members such as columns, beams, and walls, and the PC structure is formed. To construct.

[0007]

According to the present invention, a PC member having a concave cross section for tensioning an out cable is preliminarily manufactured by a pre-tension or post-tension method, and is transported to a building construction site until it is erected and is lightweight. As a PC member of the product, it can be easily handled, transported, lifted, erected, etc., the PC cable is laid in the concave section, and it is tension-bonded to the orthogonal member such as a pillar by the out cable method, and then the concave shape The cross section was filled with concrete. Therefore,
Even a member having a large final cross-section and a large weight can be lightened up to the erection stage, and restrictions on transportation and lifting can be reduced.

The shape of the PC member may be a shape having a concave cross section over the entire length in the axial direction of the member, and only the end portion is solid or a wall body (diaphragm) provided with a PC cable insertion hole. May be provided at a required position in the longitudinal direction of the member. Any shape may be used as long as it has a concave cross section in which the out cable is stretched. In the present invention, as the weight of the member is reduced, large-scale support work and brackets are not required, and since the PC cable is wired in the concave cross section, the work is easy. Moreover, by providing a PC cable insertion hole near the bottom of the wall (diaphragm) at the mounting position of the beam or at the required location, the PC cable becomes bent wiring and the tension of joining to the mounting member is reduced. Effective bending up force due to prestress.

When the PC member is joined to the mounting member, for example, when the beam is joined to the column, it may be individually joined to the orthogonal mounting members. When the PC members are continuous, a large number of members are sandwiched by the joining members. The PC members may be joined continuously. The PC member can be used as it is as a structural member without filling in the concave cross section, but after constructing the PC structure by the out cable method, concrete is filled in the concave cross section to form a solid composite member. You can also do it.

In the PC structure according to the present invention, by applying prestress stepwise, a large prestress can be introduced without damaging the members during construction due to overstress, so that even a normal building is large. There are merits, but especially the loading capacity is 1,000 kg / m ²
It is very effective for the above heavy-duty structures such as warehouses and artificial plateaus.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS. 1 and 2 are construction PCs according to an embodiment of the present invention.
It is a figure which shows the construction process of a structure. The construction method of the embodiment will be described with reference to the drawings. (A) Build the pillar 1. (B) The girder 2 is installed. Large beam 2 is a precast PC
Since the beam is a cross-sectional shape having a concave cross-section, it is lightweight, and if a small bracket is attached to the pillar 1 to support the beam, the beam can be easily supported.
This bracket may be a notch provided in the pillar itself.

The cross-sectional shape of the PC member such as the large beam 2 or the small beam 11 may be as shown in FIG. 3, for example. FIG. 3 shows a beam 2 having a U-shaped cross section. This U-shaped beam 2
Is a precast formed by the pretensioning method using the primary cable 15, and the secondary cable insertion hole 1
6, the diaphragm 3 having the tertiary cable insertion hole 17 may be formed in advance.

(C) The joint between the pillar 1 and the girder 2 is filled with joint mortar, and the girder 2 is provided with a secondary cable 4 and a tertiary cable 5 housed in a sheath, and the secondary cable 4 is tensioned. Then, the pillar 1 and the girder 2 are joined. If the girder 2 is continuous with the pillar 1 sandwiched between them, the secondary cable 4 can penetrate them and simultaneously bond them. The tertiary cable 5 is also arranged in the same manner. After that, the beam 11 and the precast slab 7 are installed.

The secondary cable 4 bears the weight and work load of the beam 11, the precast slab 7, etc., and the diaphragm 3 is provided at the required positions of the beam 2 and beam 11, as shown in FIG. By providing the secondary cable insertion hole 16 in the vicinity of the bottom portion of the, the bending-up force due to the tension force can be applied and a rational structure can be obtained. The tertiary cable 5 resists an external load such as an earthquake or a load.

(D) The secondary cable 4 is tensioned, the tertiary cable 5 is wired, and the precast slab 7 is installed. A large beam 2 sandwiches a pillar 1 and is continuously joined. (E) Placing the girder concrete 6 by cast-in-place within the concave cross section. At this time, since the girder 2 itself serves as a formwork, no formwork or supporting work is required.

FIG. 5 is a plan view of the PC structure in the steps up to here, and FIG. 6 is a view taken along the line AA of FIG. Pillars 1, 1
The girder 2 is erected between the ... and the diaphragm 3 of the girders 2 and 2.
The beam 11 is installed at the position of, and then the precast slab 7
To arrange. The beam 11 is joined to the girder 2 in the same manner as the column 1 of the girder 2 is joined, as shown in FIG. (F) Tension the tertiary cable 5 and grout it. If necessary, top concrete 8 is placed.

(G) FIG. 2 (g) is a detailed view of a part in which the girder 2 is joined to the column, the secondary cable and the tertiary cable are arranged, and the precast slab 7 and the top concrete 8 are installed. Primary cable 15 that bears the weight of the girder 2,
It bears the weight of the beam 11, precast slab 7, top concrete 8 etc. and the work load for construction, the secondary cable that bears the tension force for joining the beam and column, and the external load that acts on the completed structure. The tertiary cables are rationally arranged, and a strong and lightweight structure can be constructed.

FIG. 4 illustrates a concave cross-section PC member formed by combining a plurality of girders 22 each having a one-section cross section. The girder 22 is precast by the pretension method with the primary cable 15, and a plurality of girders are arranged side by side, and the joint concrete 23 and the diaphragm 3 are installed between the lower flanges of the girder 22 to arrange the out cable. It was made possible.

Thus, the PC member used in the present invention is
The shape does not matter as long as it has a concave cross section for stretching the out cable.

[0020]

According to the present invention, the weight of the PC structure is reduced, which contributes to the reduction of the vehicle capacity and the lifting function and the reduction of the transportation cost. In addition, omission of formwork and supporting work and simplification of brackets are possible, high-strength concrete is not required for filling concrete, and secondary cables can be stretched easily and can be bent up. Can be reduced and the number of steps can be shortened.

[Brief description of drawings]

FIG. 1 is a process drawing showing a method for constructing a PC structure of an example.

FIG. 2 is a process drawing showing a method for constructing a PC structure of an example.

FIG. 3 is a cross-sectional view of a beam of an example.

FIG. 4 is a cross-sectional view of a beam of an example.

FIG. 5 is a plan view showing an arrangement of columns and beams according to the embodiment.

6 is a view taken along the line AA of FIG.

[Explanation of symbols]

1 pillar 2 girder 3 diaphragm 4 secondary cable 5 tertiary cable 6 girder concrete 7 precast slab 8 top concrete 11 girder 15 primary cable 16 secondary cable insertion hole 17 tertiary cable insertion hole 22 girder 23 joint concrete

Claims (1)

[Claims] 1. A PC member having a concave cross-section with an open upper surface is manufactured, placed at a mounting position, and a PC cable is laid out in the concave cross-section by an out-cable method, and the PC cable is tensioned. P characterized by being jointed and constructed to a mounting member
C Structure construction method.