JPH0689566B2 - Construction method of centrifugally molded concrete structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION "Industrial field of application" The present invention is used as a pillar or a beam of a building structure, and is constructed by connecting steel pipe members provided with centrifugally molded concrete lined on the inner surface of the steel pipe. The present invention relates to a method for constructing a structure, that is, a method for constructing a centrifugally molded concrete structure.

“Conventional technology and its problems” Conventionally, the construction method of this type of centrifugally molded concrete structure is not known, and as a technology close to this, a construction method of reinforced concrete (RC) or steel frame reinforced concrete (SRC), Construction methods for steel pipe concrete piles are known.

The RC and SRC construction methods consist of arranging reinforcing bars, surrounding them with a formwork, and then filling the interior of the formwork with concrete. That is, in these RC and SRC construction methods, when connecting structural parts that have been pre-installed, connect the reinforcing bars protruding from the end faces of both structural parts with a coupler etc., and cover them with a formwork, Connection is made by placing mortar or the like inside the mold.

However, in the RC method and SRC method described above, it is necessary to assemble the formwork at the site, and the construction cost is increasing due to the shortage of workers in recent years, and much construction time and construction time are required at the site. Etc. were needed.

Further, in the case of centrifugally formed concrete steel pipe, those applied to a steel pipe concrete pile are known, and after the steel pipe concrete pile incorporates a reinforcing bar inside the steel pipe, the inside of the steel pipe is filled with concrete, It is constructed by centrifuging.

However, in the case of conventional steel pipe concrete piles, when connecting the piles on the way, only the steel pipes are connected by welding, the concrete inside and the steel pipes are not connected, and it is incomplete. Therefore, a construction technique having a complete connection portion regarding the construction method aimed at by the present invention has not been established.

The present invention is made in view of the above problems, and uses a centrifugally formed concrete steel pipe member as a member for a building structure, the centrifugally formed concrete steel pipe members can be easily connected to each other, and acts on the member. It is an object of the present invention to provide a method for constructing a centrifugally-formed concrete structure having a joint portion that reliably transmits the force that is applied.

[Means for Solving the Problem] The invention according to claim 1 is a projection insertion into a first steel pipe having a predetermined length, which slightly projects from at least one end surface of the first steel pipe in the axial direction. While manufacturing a first centrifugally-formed concrete steel pipe member having a first lining concrete in which a portion is formed, at least one end face to an end face of the second steel pipe are provided inside a second steel pipe having a predetermined length. When applying the second lining concrete so that the second lining concrete is located at a position retracted slightly longer than the dimension of the projecting insertion portion of the first lining concrete, the end surface of the second lining concrete is provided with the first lining concrete. A second centrifugally-formed concrete steel pipe member to which a fitting member to which the projecting insertion portion fits is attached is manufactured, and one of the first and second centrifugally-formed concrete steel pipe members is manufactured. After arranging a member at a predetermined position, the other member is fitted and joined to the projecting insertion portion of the first lining concrete and the fitting member of the second centrifugally-formed concrete steel pipe member, and then, It is characterized in that the gap formed by the first lining concrete, the second steel pipe and the fitting member is filled with a structural filler such as mortar.

Further, the invention according to claim 2 is, inside the steel pipe of a predetermined length, slightly projecting from one end face of the steel pipe along the axial direction and slightly longer than the projecting dimension of the projecting insertion portion from the other end face of the steel pipe. While giving back lining concrete,
A plurality of centrifugally-formed concrete steel pipe members, each having a fitting member to which the protruding insertion portion of the lining concrete fits, are attached to the other end face side of the lining concrete, and the centrifugally-formed concrete steel pipe members are arranged at predetermined positions. After installation, the projecting insertion portion of the member and the other member and the fitting member are fitted to join the members, and then to the gap formed by the lining concrete, the steel pipe, and the fitting member. It is characterized by being filled with a structural filler such as mortar.

"Operation" In the construction method of the centrifugally-formed concrete structure of the present invention, since it is configured as described above, for example, the second
After arranging the centrifugally formed concrete steel pipe member, the first centrifugally formed concrete steel pipe member is brought into contact with and joined to the member, the first lining concrete and the fitting member are fitted to each other, and The second centrifugally formed concrete steel pipe member is easily connected. By filling mortar in the gap formed by the first lining concrete, the fitting member, and the tip of the second steel pipe,
And the second centrifugally-formed concrete steel pipe member are mechanically connected.

[Example] Hereinafter, an example in which the method of the present invention is applied to a case where a pillar of a building is constructed will be described with reference to the drawings. FIG. 1 shows a pillar H as an example of a centrifugally-formed concrete structure constructed by the construction method of this embodiment.

First, the outline of the first centrifugally-formed concrete steel pipe member H1 (hereinafter simply referred to as member H1) used in the construction method of the present embodiment will be described with reference to FIG.
The member H1 is provided with a first steel pipe 1 of a predetermined length having a beam connection at a predetermined position in the longitudinal direction thereof, and inside thereof,
The first lining concrete 2 is applied by centrifugal molding so that both ends form projecting portions (projecting insertion portions) 2a that slightly project from both end surfaces of the first steel pipe 1 along the axial direction. .

Next, referring to FIG. 6, the second centrifugally-formed concrete steel pipe member H2 (hereinafter simply referred to as member H2) will be described. The second member H2 is a beam at a predetermined position midway in its longitudinal direction. A second steel pipe 11 having a predetermined length having a joint is provided, and a second lining concrete 12 is provided inside the second steel pipe by centrifugal molding, and the second lining concrete 12 is The end faces 12a are located at positions set back from the both end faces of the steel pipe to be slightly longer than the length dimension of the projecting part (projecting insertion part) 2a of the first lining concrete. Further, on both end surfaces 12a, 12a of the lining concrete 12, the first member
A fitting portion 13 that fits into the protruding portion 2a of H1 is provided, and the fitting portion 13 is an end surface 12 of the second lining concrete 12.
an end face plate 13a formed in a disc shape so as to cover a, and the end face plate
A cylindrical member 13b fixed to the inner peripheral surface of 13a and having a diameter slightly smaller than the inner diameter of the first lining concrete.
It is composed of and.

Next, the first and second members H1 and H2 configured as described above
Fig. 1 and Fig. 2 (a) for a pillar H formed by using
Will be described with reference to. The pillar H includes a first member H1 and a second member H1.
And the member H2 of (1) are connected to each other at an intermediate point of each floor (that is, near the inflection point of the moment applied to the pillar H).

The end surface of the steel pipe 1 of the first member H1 and the end surface of the steel pipe 11 of the second member H2 are in abutting contact with each other and weld-connected to each other.
The protrusion 2a of the first lining concrete 2 of the
The member H2 is fitted inside the tubular member 13b. The end face of the protrusion 2a of the first lining concrete is located slightly above the end plate 13a, and the mortar is provided in the gap formed by the protrusion 2a, the fitting member 13 and the second steel pipe 11. It has a structure filled with M.

Therefore, in the pillar H of this embodiment, the axial force and the moment acting on the upper member H1 can be transmitted to the lower member H2.

Next, referring to FIGS. 3 and 4, the pillar H according to this embodiment is used.
The case where the construction method of 1 is used on site will be described.

(I) First, as shown in FIG. 3, the first member H1 is placed on the upper portion of the second member H2 manufactured as described above with their central axes aligned.

(Ii) Next, as shown in FIG. 4, after the member H1 is built on the second member H2, the first steel pipe 1 and the second steel pipe 11
The first member H1 and the second member H2 are connected by butt welding of and.

At that time, the protruding portion 2a of the lining concrete 2 of the first member H1 is fitted inside the tubular member 13b of the fitting portion 13 of the second member H2 and also fitted to the first concrete lining 2. A gap S is formed between the member 13 and the member 13.

(Iii) Next, after the mortar inlet h1 and exhaust outlet h2 communicating with the gap S formed as described above near the top of the second member H2 are separated by 2 vertically and formed by an electric drill or the like Then, it is confirmed that the mortar is filled in the gap S from the injection port h1 and the mortar flows out from the exhaust port h2, and the state shown in FIG. 1 is obtained.

Thus, in the construction method of the present embodiment, when the upper member H1 is built into the lower member H2, the protrusion 2a of the first lining concrete becomes the fitting member 13 of the second member H2. While being fitted inside, a gap S is formed between the first lining concrete 2 and the fitting member 13, and the inside of the gap S is fixed by mortar so that the first member H1 and the second member H1 Member H2 of is connected.

Therefore, in the case of this embodiment, the first and second members H
There is no need to assemble a form when connecting 1, H2,
It is possible to mechanically connect the two, and it is possible to improve the workability and reduce the construction cost. In the pillar H of this embodiment, the members H1 and H2 are connected at an intermediate point on each floor, which is the point of inflection of the moment. When the lining concrete of the first member H1 is fitted into the fitting member, the alignment is automatically performed when the lining concrete of the first member H1 is built.

Of course, after the members H1 and H2 are built in, the inside of the lining concrete 2 and 12 inside the members H1 and H2 can be filled with concrete to improve the strength of the column.

Further, in the above-mentioned embodiment, the member H1 is built in the upper part of the member H2, but the present invention is not limited to this, and the member H1 is formed in the upper part
H2 may be built in.

Further, in the above-described embodiment, there are two kinds of the first member H1 in which the protruding portions 2a from which the lining protrudes are formed at both ends of the steel pipe and the second member H2 in which the fitting members 13 are provided at both ends of the steel pipe. The member H1 and the member H2 were made to be connected, but as a modified example thereof, as shown in FIG. 7, a protrusion 2a is formed at one end of a single steel pipe, and at the same time, at the other end side. A plurality of other centrifugally-formed concrete steel pipe members H3 provided with the fitting member 13 may be created and these may be sequentially added so that the protruding portion 2a and the fitting member 13 are connected.

Although the above is an example of a pillar, when the present invention is applied as a horizontal member such as a beam, the vertical relationship may be carried out as a horizontal (horizontal direction) relationship.
A column member may be provided in place of the above-mentioned beam member, a beam member may be manufactured using a steel pipe, and the beam members may be joined to each other while connecting the column member to a predetermined length.

Further, it is optional to appropriately change the design of the wall thickness of the steel pipe or the lining concrete, the diameter and the number of the reinforcing bars, etc. according to the conditions. Moreover, the cross-sectional shape of the pillar may be a quadrangular cross-section as shown in FIG.

"Effects of the Invention" As described above, in the method for constructing a centrifugally-formed concrete structure according to the present invention, a protruding fitting portion that protrudes from at least one end surface of the first steel pipe is provided inside the first steel pipe. The first with the first lining concrete formed
While producing the centrifugally molded concrete steel pipe member of
Second lining concrete is applied to the inside of the second steel pipe so that the end surface is located at a position where the end surface is receded from at least one end surface of the second steel pipe, and a fitting member is attached to the end surface of the second lining concrete. After manufacturing a second centrifugally-formed concrete steel pipe member and arranging one member of the first and second centrifugally-formed concrete steel pipe members, the other member is provided with the first lining concrete and the second member. The fitting member of the centrifugally formed concrete steel pipe member is brought into contact with and joined to the fitting member, and then the mortar is filled in the gap formed by the first lining concrete, the second steel pipe and the fitting member. Therefore, it is not necessary to install a formwork as in the past, and it is possible to realize a significant reduction in construction costs and shorten the construction period. It can, furthermore, can be easily connected to members each other in the middle of the member, and the force acting on the member, i.e., an effect that may be communicated to reliably below the pillars moment and axial forces. Further, the same effect as above can be obtained by adopting a centrifugally formed concrete steel pipe member in which a protruding insertion portion and a fitting member are formed at both ends of one steel pipe, and connecting the steel pipe members in sequence. .

[Brief description of drawings]

1 to 6 show an embodiment of the present invention, and FIG. 1 is a side sectional view showing an essential part of a column as a centrifugally-formed concrete structure constructed by the method of this embodiment,
2 (a) is a cross-sectional view taken along the line II-II of FIG. 1 in the case where the member has a circular cross section, and FIG. 2 (b) is shown in FIG.
II-II cross section showing a plane cross section when the member has a quadrangular cross section, FIG. 3 is a side cross sectional view of a column showing a state in which the first member is aligned with the second member, and FIG. FIG. 5 is a side sectional view of the member showing the state in which the first member is built into the member of FIG.
FIG. 7 is a side sectional view of a first member manufactured by centrifugal molding, FIG. 6 is a side sectional view of a second member manufactured by centrifugal molding, and FIG. 7 is a centrifugal molded concrete steel pipe that can be adopted in the present invention. It is a sectional side view which shows the other example of a member. H ... Pillar (centrifugal molded concrete structure), H1 ... 1st
Centrifugal-formed concrete steel pipe member, H2 ... Centrifugal-formed concrete steel pipe member, H3 ... Centrifugal-formed concrete steel pipe member, S ... Gap, M ... Mortar (structural filler), 1
...... First steel pipe, 2 …… Second lining concrete, 2a …… Projection part (projection insertion part), 11 …… Second steel pipe,
12 …… Second lining concrete, 12a …… End face, 1
3 ... Fitting member.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Kenichi Ikeda 2-16-1, Kyobashi, Chuo-ku, Tokyo Shimizu Construction Co., Ltd. (72) Inventor Yasushi Watanabe 2-16-1, Kyobashi, Chuo-ku, Tokyo Shimizu Construction Co., Ltd. (72) Inventor Takanori Sato 2-16-1 Kyobashi, Chuo-ku, Tokyo Shimizu Construction Co., Ltd. (72) Inventor Hideyo Shiokawa 2-16-1 Kyobashi, Chuo-ku, Tokyo Construction Shimizu Within the corporation

Claims (2)

[Claims] 1. A first lining concrete having a first steel pipe having a predetermined length and formed with a projecting insertion portion slightly projecting from at least one end surface of the first steel pipe in the axial direction. While manufacturing the first centrifugally-formed concrete steel pipe member, the inside of the second steel pipe having a predetermined length has at least one end face to the end face of the first lining concrete. When applying the second lining concrete so that the second lining concrete is located at a position retracted a little longer, a fitting member for fitting the projecting insertion portion of the first lining concrete to the end surface of the second lining concrete is provided. After manufacturing the attached second centrifugally-formed concrete steel pipe member, arranging one of the first and second centrifugally-formed concrete steel pipe members at a predetermined position, and then the other part Was joined by fitting the fitting member of said first of said the projecting 挿合 portion of the lining concrete second centrifugal molding concrete steel member, then the first
A method for constructing a centrifugally-formed concrete structure, characterized in that a gap formed by the lining concrete, the second steel pipe and the fitting member is filled with a structural filler such as mortar. 2. A lining concrete which is slightly projecting from one end face of the steel pipe in the axial direction and which is retracted from the other end face of the steel pipe to be slightly longer than the projecting dimension of the projecting insertion portion inside the steel pipe having a predetermined length. A plurality of centrifugally-formed concrete steel pipe members in which a fitting member into which the protruding insertion portion of the lining concrete is fitted is attached to the end face of the lining concrete on the other end face side are manufactured, and the centrifugally-formed concrete steel pipe member is predetermined. After arranging in a position, the projecting insertion portion of the member and the other member and the fitting member are fitted to join the members, and then the lining concrete, the steel pipe and the fitting member are formed. A method for constructing a centrifugally-formed concrete structure, which comprises filling a crevice with a structural filler such as mortar.