JPH06101268A - Hollow precast rigid-frame structure - Google Patents

Abstract

PURPOSE:To ensure the facility space of a piping, etc., and to lighten the title structure by building a hollow Pca post and a girder, installing a hollow Pca floor slab to the post and the girder, projecting reinforcements from the connecting sections of each member and mutually unifying the connecting sections. CONSTITUTION:A hollow Pca post 1 is constructed, hollow Pca girders 2, 2 are bridged at the upper end section of the post 1, and hollow Pca floor slabs 3 are laid on the girders 2, 2. Reinforcements are projected from the connecting sections of these each member, and the joints are mutually unified, joined and treated by cast-in-place concrete. The post 1 and the girders 2 are blow-molded with concrete densely and solidly through a centrifugal casting method, etc., and facility pipings, electrical wirings, etc., are laid through each hollow section 1a, 2a, 3a. Accordingly, member weight and building weight can be reduced without deteriorating the structural performance of rigid frames.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hollow precast ramen structure used for construction of large low- and medium-rise buildings.

[0002]

2. Description of the Related Art As a countermeasure against the shortage of construction workers and the aging of population in recent years, many construction works are being made into factories and industrialization methods for the purpose of labor saving and labor saving at each construction work place. It is in the present condition. In particular, in a reinforced concrete structure (hereinafter, abbreviated as RC structure) building, a precast concrete method for constructing building members (hereinafter, abbreviated as Pca method) has been greatly promoted.

[0003]

As described above, the Pca method is widely used in the construction work place for the purpose of labor saving and labor saving. However, as the building becomes larger, the building member (Pca member) becomes larger. The dimensions (section size, member length) are also increasing, and the member weight is approaching the limit of the lifting capacity of the lifting machine, and the lifting cost is rising. In addition, the increase in the weight of the building itself has also become a major problem in that the load on seismic force and pile strength increases.

Therefore, an object of the present invention is to reduce the weight of Pca members (construction members) in the Pca construction method, to reduce the cost of lifting and to reduce the cost due to the weight reduction of the building itself, and to reduce the seismic force and pile proof stress. The purpose of the present invention is to provide a hollow precast ramen structure capable of reducing the burden.

[0005]

As a means for solving the above-mentioned problems, the hollow precast ramen structure according to the present invention, as shown in the embodiments in the drawings, builds a hollow precast concrete column 1, A hollow precast concrete beam 2 is erected on the upper end of the pillar 1, and a hollow precast concrete floor slab 3 is erected on the beam 2 so that the respective members 1, 2 and 3 are integrated with each other. It is characterized by

In the hollow precast concrete frame structure of the present invention, equipment pipes 4, electrical wiring, etc. are laid through the hollow parts 1a, 2a, 3a of the hollow precast concrete columns 1 and precast concrete beams 2 and precast concrete floor slabs 3. It is also characterized by being broken.

[0007]

[Function] Hollow Pca pillar 1, Pca beam 2, Pca floor slab 3
The hollow ratio can be about 15% to 25%, and the weight of the member can be reduced and the weight of the building can be reduced by the same ratio. Therefore, the cost of hoisting can be reduced, the basic structure of the building can be reduced, the earthquake input can be reduced, and the cross section of the member can be reduced.

Further, the hollow Pca pillar 1, Pca beam 2, P
By using the hollow portions 1a, 2a, 3a of the ca floor slab 3 as equipment spaces and laying equipment piping 4, electric wiring, etc., the degree of freedom in equipment design and construction can be increased, and efficiency can be promoted.

[0009]

EXAMPLE An example of the present invention shown in the drawings will be described below.
As an embodiment of the hollow precast ramen structure of the present invention, FIG. 1 shows a hollow Pca column 1 built, hollow Pca beams 2 and 2 are erected on the upper end of the column 1, and a hollow Pca beam 2 is provided above the beams 2 and 2. Although the Pca floor slab 3 of No. 1 is erected and each member is not shown in the drawing, the reinforcing bars are projected at the joints and they are integrated with each other by a known joining method (wet construction method) for in-situ concrete integration. An integrated joining process is being performed. Further, FIG. 2 shows the hollow Pca columns 1 and Pca beams 2 in the hollow precast ramen constructed as described above, and the hollow portions 1a and 2 of the Pca floor slab 3, respectively.
The state where the equipment pipe 4 is laid using a and 3a is shown. On the hollow Pca beam 2 described above, the upper side portion 5 of the hoop reinforcement is exposed in order to be integrated with the slab concrete cast on the upper surface thereof.

The manufacture of the hollow Pca pillar 1 and the Pca beam 2 has the structure shown in FIGS. 3A and 3B, and it is effective to adopt the already established centrifugal casting method. According to this method, the hollow molding is easy and the concrete becomes solid.
The advantage that the pillar 1 and the Pca beam 2) can be manufactured is great. Alternatively, it can be manufactured by adopting a tube form forming method. By the way, when the hollow portion 1a having a diameter of 450 mm is formed in the central portion of the column 1 of each cross section having a side of 800 mm, the hollow rate is 25%. Further, the hollow ratio is 15% when the hollow portion 2a having a diameter of 250 mm is formed on the beam 2 having a square cross section of 550 × 600 mm in length and width. The lithographic Pca floor slab 3 can be manufactured by adopting a tube form forming method in which a tube inflated with compressed air is arranged at each hollow portion 3a and concrete is placed. Alternatively, it can be produced by an extrusion molding method (spancrete). By the way, the floor slab 3 with a thickness of 300 mm has a diameter of 150.
When the hollow portions 3a of mm are formed with a pitch of 250 mm, the hollow rate is 24%.

The hollow precast ramen structure of the present invention uses a precast steel reinforced concrete construction (SRC) in which a steel aggregate is used as the core material (reinforcement material) of the hollow Pca member or a steel aggregate is used for a part or all of columns and beams. Construction can be applied to buildings in exactly the same way.

[0012]

EFFECTS OF THE INVENTION The hollow precast ramen structure according to the present invention can reduce the weight of members and the weight of the building without deteriorating the structural performance of the ramen, thus reducing the lifting cost and building foundation. By reducing the weight of the structure and the seismic input, it is possible to reduce the cross section of the member. Moreover, since the hollow portion of the hollow Pca member can be used as equipment space, the degree of freedom in equipment design and construction is increased, and efficiency can be achieved.

[Brief description of drawings]

FIG. 1 is a perspective view of a main part of a hollow precast ramen structure according to the present invention.

FIG. 2 is a sectional view of a portion shown in FIG.

3A, 3B and 3C are cross-sectional views of hollow Pca columns, beams and floor slabs.

[Explanation of symbols]

 1 Pca pillar 2 Pca beam 3 Pca floor slab 4 Facility piping 1a, 2a, 3a Hollow part

Claims (2)

[Claims] 1. A hollow precast concrete pillar is built, a hollow precast concrete beam is erected on the upper end of the pillar, and a hollow precast concrete floor slab is erected on the beam so that the members are integrated with each other. Hollow precast ramen structure, which is characterized by being treated. 2. The hollow according to claim 1, wherein facility piping, electric wiring, etc. are laid through hollow portions of the hollow precast concrete column, the precast concrete beam, and the precast concrete floor slab. Precast ramen structure.