JPH06129054A - Steel pipe hollow concrete member and its manufacture - Google Patents

Abstract

PURPOSE:To easily reduce weight by providing a hollow concrete member and a framework part in a steel pipe member and by making the framework forming the follow a part of a product. CONSTITUTION:A framework member 4 is fixed to a fixed part 5 at a predetermined position at a hollow part of a square steel pipe member 2, and the space is filled with a concrete to have a hollow concrete member 3. And this steel pipe hollow concrete member 1 is given vibration compaction with a framework vibrator, and the framework fixed member 5 is taken out and the framework member 4 is integrated to be a part of a product. Thus, the shape and mounting position of the framework can be freely designed, and performance of the members can be fully exerted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steel pipe hollow concrete member used as a structural member such as a beam of a building structure. More specifically, the present invention relates to a hollow concrete member in which a hollow concrete member mounted in a steel pipe member constitutes a part of a product by integrating a precast mold member as it is, and a manufacturing method thereof.

[0002]

2. Description of the Related Art Conventionally, there is a steel pipe concrete member in which concrete is filled in the steel pipe member in order to strengthen the strength and fire resistance of the steel pipe of the steel pipe structure.

As a means for further strengthening the steel pipe concrete member, disclosed in JP-A-60-164542, in which the steel pipe member is filled with concrete and a long length of PC steel is embedded in the concrete over its entire length. There is a steel pipe concrete member.

Further, there is a steel pipe concrete member disclosed in JP-A-3-281857, in which a centrifugal force forming concrete member is provided inside a square steel pipe member.

It is good to use these as pillars,
When used as a beam member, the former is still heavier and the latter has not only a small hollow portion but also large restrictions in shape, structure, arrangement, etc. due to the features of its manufacturing method.

[0006]

The problem to be solved by the present invention is to eliminate the above-mentioned conventional drawbacks.
More specifically, it is an object of the present invention to obtain a steel pipe hollow concrete member which is lighter in weight, tougher and more freely shapeable than conventional ones, and easy to manufacture.

Another object of the present invention is to provide a steel pipe hollow concrete member which can be easily manufactured without using a large apparatus such as centrifugal molding.

[0008]

This problem is solved by using a mold forming a hollow inner space as a part of the product as it is. Further, it is solved by subjecting this to precast molding such as compaction.

[0009]

FUNCTION AND STRUCTURE The details of the present invention will be described below with reference to embodiments. In the first embodiment, as shown in FIG. 1, a steel pipe member 2 is provided with a hollow concrete member 3 and a form member 4. In the following description, the same components as those in the above embodiment are designated by the same reference numerals, and the description thereof will be omitted.

In this embodiment, the steel pipe member 2 of the steel pipe hollow concrete member 1 is square. The mold member 4
Is fixed at a predetermined position with a fixing member 5, and then the space is filled with concrete to form a hollow concrete member 3. As an example of the mix of the concrete, 20 to 25% of coarse aggregate of 20 mm or less is used. Unit cement amount 450-52
0 kg. Water cement ratio 32-40%. Slump 6-1
8. There is. The mold member 4 at this time may be a thin-walled steel pipe 6 as shown in FIG. 2A, but a duct member 7 formed by winding a thin steel plate in a spiral shape (B) is preferable. This is because the spirally wound and projected portion 8 can exert a suitable anchoring effect on the concrete member 3 like a node of deformed steel bar.

The duct member 7 wound in a spiral shape
Is loosely wound to allow expansion and contraction, which is suitable for pressure vibration compaction and pressure curing.

The steel pipe member 2 as it is or placed on a vibrating table (not shown) is a form vibrating machine and has an amplitude of 1 mm and a frequency of 70.
Vibration compaction at 00 vpm. The steel tube hollow concrete member 1 is removed from the frame fixing member 5 and the vibrating table and subjected to appropriate curing such as steam curing to become a product.

In the second embodiment shown in FIG. 3, the steel pipe member 2 is rectangular, and the mold 4 is elliptical and set at a predetermined position.

In this embodiment, the mold 4 is displaced upward to change the thickness of the hollow concrete member 3 above and below.

In the third embodiment, the steel pipe hollow concrete member 1 shown in FIG. 4 is formed in a substantially arch shape in the longitudinal direction.

In the fourth embodiment, as shown in FIG. 5, a high-strength PC steel bar 9 is inserted into a predetermined position, and concrete is filled into the hollow concrete member 3 while maintaining a constant tensile stress. A steel tube hollow concrete member 1 having a PC steel bar 9 buried therein was used. The PC steel bar may be PC steel or stranded wire, and the embedding position and the number thereof are free.

A fifth embodiment is shown in FIG. 6, in which the hollow concrete member 3 is mixed with a metal fiber 10 of high tension to improve the strength of the steel pipe hollow concrete member 1. The fiber is not limited to metal.

The sixth embodiment is shown in FIG. 7, in which the hollow concrete member 3 has a thick portion 12 formed at the end 11 of the steel pipe member 2.

[0019]

As described in detail above, according to the present invention,
Compared to conventional centrifugal molding methods and precast products filled with PC steel bar concrete, there are various effects listed below. (1) No large-scale precast manufacturing equipment is required. (2) The hollow part is large and easy to reduce the weight. (3) Since the shape of the formwork and the installation position can be freely designed, the performance of the hollow concrete member can be sufficiently exhibited. (4) It has the advantages of both the centrifugal molding method and PC steel bar concrete, and the weight can be reduced by 10% or more. (5) It can be applied to a rectangular rectangular steel pipe member which has been difficult in the past, and is extremely suitable as a building beam member. (6) It is possible to manufacture a beam member having a substantially arch shape, which has been difficult in the past. (7) The steel pipe hollow concrete member is made stronger by thickening or sealing the ends of the steel pipe hollow concrete member.

The conventional concrete-filled steel pipe has a size and a meat strength which are several times higher than the local buckling resistance, deformation resistance and fire resistance of reinforced concrete, steel pipe or steel frame structure. It is said that it can be designed with a small thickness, the fireproof coating is half that of steel pipes and steel frame structures, and it not only can increase the effective space of buildings, but also shorten the construction period. The present invention further improves this and can provide a lighter and stronger steel pipe hollow concrete member.

In the above description, a square steel pipe member has been described, but a circular steel pipe member may be used, and the form member may be a thin-walled steel pipe,
Alternatively, the duct material has been described, but the material thickness is not limited to this, and the shape of the form member may be a circle, an ellipse, an egg shape, a polygon, or any other shape.

Further, it goes without saying that the molding method is not limited to the examples, and any known manufacturing method may be used as long as it can be manufactured by precasting.

If necessary, a protrusion may be provided on the inner surface of the steel pipe member to ensure connection with the hollow concrete member. Depending on the application, a film-like or paste-like material may be provided between the steel pipe member and the hollow concrete member. The separating material may be provided.

Further, an expansion material may be used for prestressing. Depending on the application, the hollow concrete member in the steel pipe member may be foamed concrete. Examples of foam concrete include lightweight cellular concrete called ALC that has been autoclaved and CT slab material. Further, the foamed hollow concrete member may be impregnated with a polymer such as methyl methacrylate, styrene, acrylonitrile, etc., and may be subjected to heat treatment to polymerize the resin to integrally combine with the hollow concrete member.

[Brief description of drawings]

FIG. 1 is a sectional view showing a steel pipe hollow concrete member according to a first embodiment of the present invention and a manufacturing method thereof.

FIG. 2 is a perspective view showing an example of a mold.

FIG. 3 is a sectional view showing a steel pipe hollow concrete member according to a second embodiment.

FIG. 4 is a side view of a steel pipe hollow concrete member formed in a substantially arch shape according to a third embodiment.

FIG. 5 is a vertical sectional view of a fourth embodiment.

FIG. 6 is a vertical sectional view of a fifth embodiment.

FIG. 7 is an explanatory view of a sixth embodiment and is a transverse side view.

[Explanation of symbols]

 1. Steel tube hollow concrete member 2. Square steel pipe member 3. Hollow concrete member 4. Formwork member 5. Formwork fixing member 6. Thin-walled steel pipe 7. Duct material 8. Protrusion 9. PC steel bar 10. Metal fiber 11. Edge 12. Thick part

Claims (10)

[Claims] 1. A steel pipe hollow concrete member, wherein at least a part of a hollow portion in the steel pipe member is constituted by a form member. 2. The steel pipe hollow concrete member according to claim 1, wherein the hollow concrete member in the steel pipe member is foamed concrete. 3. The wall thickness of the hollow concrete member in the steel pipe member is provided so as to be partially biased.
And the steel tube hollow concrete member according to claim 2. 4. The steel pipe hollow concrete member according to claim 1, wherein the steel pipe member is formed in a substantially arch shape in the axial direction (longitudinal direction). 5. The hollow concrete member in the steel pipe member is configured so as to form a substantially arcuate or tapered thick portion in the axial direction (longitudinal direction) in the steel pipe member.
The steel pipe hollow concrete member according to claim 3. 6. The steel pipe hollow concrete member according to claim 1, wherein at least a part of an end portion of the hollow concrete member in the steel pipe member is thickened or closed. 7. The steel pipe hollow concrete member according to claim 1, wherein short fibers are dispersed and compounded in the concrete member inside the steel pipe member. 8. A long PC steel is embedded over the entire length in a concrete member in the steel pipe member.
The steel pipe hollow concrete member according to claim 7. 9. A method for producing a steel pipe hollow concrete member, comprising a hollow concrete member provided in the steel pipe member in a precast state such as known compaction molding. 10. The production of a steel pipe hollow concrete member according to claim 9, wherein the mold member used in the compaction molding or the like directly constitutes at least a part of the hollow portion of the product. Method.