JPH09184201A - Method and structure for joining columns - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a joining structure suitable for recycle of columns. SOLUTION: The joining structure for a lower column 2A with an upper column 2B is such that the lower half of a cylindrical ring panel 9 is fitted on the top of the lower column 2A, and the bottom of the upper column 2B is inserted in the upper half of the ring panel 9, and between the top surface of the lower column 2A and the bottom surface of the upper column 2B, spacer means 91, 92 are furnished which generate aligning of the two columns 2A, 2B and secure a gap 96 between their end face. This gap 96 and gaps 95 secured between the peripheries of the columns 2A, 2B and the ring panel 9 are filled with a nonshrink mortar 100, and thus the lower and upper columns 2A and 2B are joined together.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a column joining structure and a joining method suitable for constructing a recycled building frame.

[0002]

2. Description of the Related Art In recent years, from the standpoint of global environmental protection, social interest in recycling industrial products has increased, and the demand for recycling building structures has also increased.

Considering the recycling of a building, the form may be "re-materialization", "recycling", "diversification". “Remembering” means retaining the shape of the member and reusing it for the same purpose as the original member.
“Recycling” means returning to a material (raw material) once and reusing it. "Diversion" means reuse for a completely different purpose from the original member. A typical example of “recycling” is regeneration of iron or aluminum by an electric furnace. A typical example of “diversification” is the use of concrete waste for road paving and land reclamation.

Conventionally, the following achievements have been made regarding the recycling of building structures. For example, regarding the reinforced concrete structure, the concrete after the dismantling of the skeleton is used as concrete waste for land reclamation, road paving, etc. (diverted). In terms of steel frame construction, the steel frame after dismantling is returned to the electric furnace as scrap and is recycled as steel material.

[0005]

By the way, the conventional recycling has been limited to diversion as concrete waste and recycling as scrap, and the measures for recycling have not been sufficiently taken into consideration.

It is an object of the present invention to provide a column joining structure and a joining method capable of re-membering columns which are main constituent members.

[0007]

An important point for re-membering is firstly to guarantee the quality and durability of the disassembled main constituent members. In other words, it enables the damage-free disassembly of the main components.

According to a first aspect of the present invention, in a joint structure of a lower column and an upper column, a lower half portion of a tubular ring panel is fitted and inserted into an outer periphery of an upper end of the lower column, and an upper half portion of the ring panel is connected to the upper column of the upper column. The lower end is inserted, and spacer means is provided between the upper end surface of the lower pillar and the lower end surface of the upper pillar to center the two pillars and to secure a gap between the end surfaces of the two pillars. The lower column and the upper column are joined to each other by filling the gap secured between the column and the ring panel with a filler.

In this case, the columns are joined to each other by the ring panel and the filling material. Therefore, the upper column can be separated and removed by cutting the ring panel and crushing the filling material inside.

According to a second aspect of the present invention, there is provided a method for joining a lower column and an upper column, wherein a cylindrical ring panel is positioned on an outer periphery of an upper end of an upright column, and a lower half portion of the tubular ring panel is fitted and inserted into the ring panel. The lower half of the upper pillar is suspended from above in the upper half of the upper pillar, and the two pillars are centered. In that state, the gap between the upper end surface of the lower pillar and the lower end surface of the upper pillar and the outer circumference of the upper and lower pillars It is characterized in that the upper and lower columns are joined by filling a gap secured between the ring panel and the ring panel with a filler.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. The column used here is a CFT (Concrete Filled st
It is a pillar. The CFT column has excellent structural strength and toughness as well as high fire resistance, and has a great merit that the fire resistant coating required in the case of a general steel frame member can be omitted (the fire resistant coating is a serious inhibiting factor for recycling). In addition,
Depending on the conditions, instead of CFT pillars, PC pillars filled with concrete inside the precast concrete pipe,
It is also possible to use an SC column in which the outside of the precast concrete pipe is further covered with a steel pipe.

In FIG. 1, the upper column (FIG. 2) is attached to the upper end of the lower column 2A.
The content of the first process part when joining (see below) is shown. Upon joining, first, the positioning temporary metal fitting 4 is attached to a predetermined position on the outer periphery of the lower column 2A in the vicinity of the upper end thereof. The positioning temporary hardware 4 has a band plate 41 wound around the outer periphery of the lower column 2A, and a ring-shaped receiving plate 42 fixed to the upper end of the band plate 41 in a relationship orthogonal to the outer peripheral surface of the lower column 2A, It is divided in half at the diameter position. Flange 4 at the tip of the halved part
3 and 43 are provided, and these flanges 43 and 43 are put together and tightened with bolts and nuts 45 so that they can be wound around the outer circumference of the column 2.

Further, as shown in FIG. 2, a screw 46 can be passed through the band plate 41, and the screw 46 is screwed into a screw hole 46a formed in the column 2 to position the screw. The temporary hardware 4 can be fixed at a predetermined position. The flange 43 also functions as a rib that supports the receiving plate 42, and in addition to that, a reinforcing rib 44 is appropriately provided. When the upper column 2B is joined, the positioning temporary metal fitting 4 is attached and placed in advance below the beam joining planned position of the lower column 2A.

After the positioning temporary metal fitting 4 is fixed, it is hung from above by the crane on the upper end of the lower column 2A, and the tubular ring panel 9 forming the joint is inserted and the lower end of the ring panel 9 is positioned. The temporary hardware 4 is placed on the receiving plate 42. The ring panel 9 is made of a steel pipe having an inner diameter slightly larger than the outer diameters of the upper and lower columns 2A and 2B, and the lower half portion of the ring panel 9 is fitted into the upper end of the lower column 2A while being mounted on the receiving plate 42. .

The upper surface of the receiving plate 42 or the lower column 2A
When a plurality of triangular guide pieces 47 as shown in FIG. 2A are provided on the outer surface of the ring panel 9 evenly in the circumferential direction, the ring panel 9 is guided by the inclined surface of the guide piece 47.
Can be guided to an appropriate position, and the gap 95 between the ring panel 9 and the lower column 2A can be evenly secured over the entire circumference. In addition, as shown in FIG. 2B, a notch groove 47a into which the guide piece 47 is fitted is formed at the lower end of the ring panel 9.
By providing, the positioning in the circumferential direction can be performed when the ring panel 9 is fitted and inserted.

Next, as shown in FIG. 3, the upper pillar 2B is suspended by a crane, and the lower end of the upper pillar 2B is housed inside the ring panel 9 at the upper end of the lower pillar 2A. At this time,
The upper pillar 2B is supported by an adjustment wire (temporary support for pillar erection) 3B for producing verticality. Further, concave-convex fitting plates (spacer means) 91 and 92 having different heights to be fitted to each other are embedded in the upper end surface of the lower pillar 2A and the lower end surface of the upper pillar 2B. At the time of butting, these are fitted to each other, so that a predetermined gap 96 is secured between the end faces of both columns 2A and 2B, and both columns 2A and 2B are positioned (centered) with respect to each other.

Further, as shown in FIG. 2, a plurality of triangular guide pieces 48 are provided on the outer peripheral surface of the upper column 2B so as to be equidistantly arranged in the circumferential direction, and the upper column 2B is housed in the ring panel 9. At this time, the slope of the guide piece 48 is the ring panel 9
The upper pillar 2B is positioned by the guide action of the guide piece 48 by slidingly contacting the upper edge of the upper pillar 2B. Also in this case, as shown in FIG. 2B, the notch groove 48 into which the guide piece 48 is fitted is formed on the upper end of the ring panel 9.
If a is provided, the upper pillar 2B is positioned in the circumferential direction when the upper pillar 2B is housed in the ring panel 9.

Then, in the gap 96 secured between the pillars 2A, 2B and the ring panel 9 and the gap 95 between the end surfaces of the upper and lower pillars 2A, 2B, non-shrink mortar 100 as a filler is filled.
And the upper and lower columns 2A and 2B are joined together by a weld-free joint between the mortar 100 and the ring panel 9. As a result, the joint structure of the columns shown in FIG. 3 is completed. The temporary fitting for positioning 4 and the adjusting wire 3B are removed after the required strength of the mortar 100 is developed. A similar joining method can be adopted by using PC columns or SC columns instead of CFT columns as the columns 2A and 2B.

As described above, by using the non-welded joint method for joining the upper and lower columns 2A and 2B, the ring panel 9 is cut and the internal mortar 100 is peeled off at the time of dismantling. The joint can be returned to its original state without damage. Then, the undamaged pillars 2A, 2B are "remembered", the ring panel 9 is "recycled", and the mortar 100 is diverted as landfill for concrete and the like.

In order to achieve sufficient transmission of tensile stress to an upward external force such as a gas explosion, as shown in FIG. 4, the inner peripheral surface of the ring panel 9 and the outer peripheral surfaces of the upper and lower columns 2A, 2B. In addition, when the tensile force acts on the pillars 2A and 2B, the convex portions 9 formed by welding the reinforcing bars and the like face each other.
It is desirable to provide 9,98. Then, the stress indicated by the arrow is transmitted between both the convex portions 99 and 98, and the tensile force is transmitted between the upper and lower columns 2A and 2B.

[0021]

As described above, according to the present invention,
The lower column and the upper column are joined by the ring panel fitted at the upper and lower ends of the column and the filling material filled inside the column, so that the ring panel can be re-membered only by crushing and crushing the filling material. The pillar can be dismantled without damage. Moreover, since the filler is filled in a state in which a gap is secured between the end faces of the upper and lower columns, the bonding strength is increased. Further, by using the spacer means, the gap can be secured and both columns can be centered, so that the construction can be facilitated.

[Brief description of the drawings]

FIG. 1 is a perspective view showing the contents of a first step of a joining method according to an embodiment of the present invention.

2A and 2B show a state after the step of FIG. 1, in which FIG. 2A is a longitudinal sectional view of a main part, and FIG. 2B is a front view of the main part.

FIG. 3 is a cross-sectional view of the joining structure of the embodiment of the present invention obtained by carrying out the joining method of the present invention.

FIG. 4 is a cross-sectional view showing a structure in which reinforcement is applied to a tensile load in the portion shown in FIG. 3 and a method of transmitting stress to the tensile load.

[Explanation of symbols]

 2A Lower pillar 2B Upper pillar 9 Ring panel 91 Convex fitting plate (spacer means) 92 Concave fitting plate (spacer means) 95, 96 Gap 100 Non-shrink mortar (filler)

Front page continuation (72) Inventor Hidemitsu Tanaka 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Construction Co., Ltd. (72) Inventor Toshio Oyama 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Construction Co., Ltd. (72) Inventor Takamasa Kikuchi 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Construction Co., Ltd. (72) Inventor Riki Yamamoto 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Construction (72) Inventor Fumito Takagi 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Construction Co., Ltd.

Claims (2)

[Claims] 1. In a joint structure of a lower pillar and an upper pillar, a lower half portion of a cylindrical ring panel is fitted and inserted into an outer periphery of an upper end of the lower pillar, and a lower end of the upper pillar is inserted into an upper half portion of the ring panel. Spacer means is provided between the upper end surface of the lower pillar and the lower end surface of the upper pillar to center the two pillars and to secure a gap between the end surfaces of the two pillars. A column joining structure characterized in that a lower column and an upper column are joined to each other by filling a gap secured between them with a filling material. 2. A tubular ring panel is positioned on the outer circumference of the upper end of a vertically arranged upright pillar, and the lower half portion of the tubular ring panel is inserted into the upper half portion of the ring panel, and the lower end of the upper pillar is suspended from above. The two pillars are centered by putting them in while lowering them, and in that state, fill the gap between the upper end surface of the lower pillar and the lower end surface of the upper pillar and the gap between the outer circumference of the upper and lower pillars and the ring panel. A column joining method characterized in that upper and lower columns are joined by filling.