JPH09235912A - Column-shaped concrete structure and its construction - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a construction method that is executed simply in improved strength, durability and with excellent appearance by erecting reinforcement members. SOLUTION: A column-shaped structure 12 in a circular or polygonal section is formed with a plurality of split precast concrete members 10 arranged in the circumferential direction and connected with one another with annular members 14 arranged at the inner circumference 13, and a plurality of such column-shaped structures are placed on a foundation and stacked up to a specified height and thereby an external shell F is formed. Reinforcement members 3 are erected at the inside of the external shell F, and concrete is placed to a specified thickness to form a concrete part 2, and thereby a column-shaped concrete structure is constructed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete columnar structure and a method of constructing the same, and particularly to columns of a structure having a relatively large cross section, bridges and viaduct piers, chimneys, tanks,
It can be suitably used for silos, tower-like structures and the like.

[0002]

2. Description of the Related Art In order to construct a concrete columnar structure, for example, a column of a building, a cylindrical precast formwork is piled up and used as an outer shell of the structure, and a reinforcing material is provided inside the structure. It was built and concrete was placed. Alternatively, when the cross-sectional area of the structure is relatively large, a divided precast member obtained by dividing the precast formwork into a plurality of parts is manufactured in advance, and the divided precast member is assembled into a predetermined sectional shape on site to form a columnar body. It was formed, this columnar body was piled up at a predetermined height, a reinforcing material was built inside, and concrete was placed.

[0003]

As described above, in constructing a concrete columnar structure, when a plurality of divided precast molds are assembled on site, these precast molds are placed inside. It must be able to withstand the lateral pressure of concrete. For that purpose, it was necessary to resist lateral pressure from the outside by providing a supporting structure on the outside of the precast form.

According to the conventional construction method, since the attachment and detachment work of such a support work is required and the work scaffold for attaching the support work is required on the outer side of the columnar structure.
The construction of the columnar structure was troublesome. Moreover, since the supporting work cannot be removed until the curing period for the concrete to harden, there is a problem in terms of work efficiency.

Further, it has been attempted to support the columnar structure from the inside in the diametrical direction with a separator or the like, but in this case, the work inside the columnar structure is hindered and the hole needs to be filled from the outside. . In addition, a so-called separation hole for supporting remains on the outer surface of the columnar structure, which makes it unattractive.

It is an object of the present invention to solve the above problems, and to provide a concrete columnar structure excellent in strength, durability and appearance, and a method of constructing the same, which is easy to construct. .

[0007]

The present invention relates to a concrete columnar structure and a method of constructing the same, and has the following constitution in order to solve the above-mentioned technical problems. That is, the concrete columnar structure of the present invention, a plurality of divided precast members are arranged in the circumferential direction, a plurality of columnar bodies having a circular cross section or a polygonal shape which are interconnected by an annular member arranged on the inner peripheral surface. An outer shell formed by stacking it up to a predetermined height on a foundation, a concrete portion placed with a predetermined thickness inside the outer shell, and a reinforcing material built in the concrete portion. Characterize.

In the present invention, a plurality of divided precast members are connected in the circumferential direction to form a columnar body corresponding to an integral type precast mold. If the columnar structure has a circular cross-sectional shape, an arc is formed. The shape may be an appropriate shape depending on the cross-sectional shape of the columnar structure.

The thickness of the concrete portion means a space between the outer peripheral surface of the inner formwork, the outer shell and the inner side when the inner formwork is provided inside the columnar structure, and when the inner formwork is not provided. It is a value close to the diameter of the columnar structure.

The divided precast member is manufactured by using concrete or mortar as a base material. One or more selected from steel fiber, stainless steel fiber, aramid, vinylon, carbon fiber and glass fiber are used. It can also be mixed as a reinforcing material.

The annular member is made of iron, and is preferably steel such as structural steel. Further, the reinforcing material built in the concrete portion is a reinforcing bar and / or a steel frame, and the steel frame is preferably a section steel, particularly an H section steel.

According to the method for constructing a concrete columnar structure of the present invention, a plurality of columnar bodies having a circular or polygonal cross section are formed by arranging divided precast members in which an insert member is embedded in the inner peripheral surface in the circumferential direction, Applying an annular member to the inner peripheral surface of each columnar body, inserting a fastening member into the insert member exposed on the inner peripheral surface of the divided precast member to fix the annular member to each divided precast member It is characterized in that it comprises a step of retaining the shape of the columnar body, a step of stacking each of the columnar bodies, building a reinforcing material inside thereof, and then placing concrete.

In the present invention, it is also possible to arrange an inner mold inside each stacked columnar body and build a reinforcing material in the space between the columnar body and the reinforcing material. Further, the step of building the reinforcing material and the step of stacking the columnar bodies can be performed in reverse order as necessary. The inner formwork may be made of concrete or tubular metal.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION The concrete columnar structure and its construction method of the present invention will be described below in more detail with reference to the embodiments shown in the drawings. FIG. 1 shows a construction state of a concrete columnar structure according to an embodiment of the present invention, and FIG. 2 shows a cross section of the concrete columnar structure.

Concrete columnar structure 1 of this embodiment
Is a bridge pier with a plurality of divided precast members 1
0 is arranged in the circumferential direction, and is mainly composed of a plurality of columnar bodies 12 each having a circular cross section, which are joined to each other by a steel annular member 14 arranged on the inner peripheral surface 13. That is, an outer shell F of the concrete columnar structure 1 is formed by stacking the columnar bodies 12 on a foundation (not shown) to a predetermined height. An inner mold 4 made of concrete is formed inside the outer shell F, and concrete is cast between the inner mold 4 and the outer shell F to form a concrete portion 2, and the concrete portion 2 is reinforced. A plurality of H-section steels 3, which are materials, are built in.

The divided precast member 10 constituting the columnar body 12 has a plate shape curved in an arc shape as shown in FIGS. 3 to 6, and is manufactured in advance in a factory. A plurality of stainless steel insert members 15 are embedded in the inner peripheral surface 13 of the precast member 10. In the present embodiment, the insert members 15 are embedded along the inner peripheral surface 13 in six rows and five rows in the height h direction. A female screw 16 is formed on each insert member 15, and an insertion opening for the female screw 16 is exposed on the inner peripheral surface 13 as apparent from FIG. 6.

Furthermore, as shown in FIGS. 7 to 8, five steel annular members 14 are applied to the inner peripheral surface 13 of each of the divided precast members 10 arranged in the circumferential direction, and are connected by connecting members. A certain bolt 17 is screwed into the insert member 15 through a hole formed in the annular member 14, whereby a plurality of divided precast members 10 arranged in the circumferential direction are fixed in the circumferential direction to form the columnar body 12. That is, the columnar body 12 is retained by the annular member 14. It should be noted that the inner formwork 4 is specifically composed of a plurality of annular formwork 4a, 4b.
.. are formed by stacking.

In the embodiment of the present invention, when concrete is placed inside the concrete columnar structure, the lateral pressure P at the time of placing concrete acts on the columnar body 10 as shown in FIG. The reaction force is received by the connecting portion of the annular member 14 and the plurality of divided precast members 10 and is borne by the circumferential tensile force of the annular member 14.

In order to construct the concrete columnar structure 1, first, a plurality of columnar bodies 12 are formed by arranging the divided precast members 10 in which the insert members 15 are embedded in the inner peripheral surface 13 in the circumferential direction.

At this time, the annular member 14 is applied to the inner peripheral surface 13 of each columnar body 12, and the female screw 1 provided on the insert member 15 exposed on the inner peripheral surface 13 of the divided precast member 10.
A bolt 17 as a fastening member is screwed into 6 to fix the annular member 14 to each divided precast member 10. Each columnar body 12 is in the same state as if it was shaped from the outside by the supporting work.

On the inner side of the columnar body 12, the annular member 1
The strip reinforcing bar 5 is arranged in parallel with 4. This band reinforcing bar is attached to the reinforcing bar fixing jig 6 orthogonal to this by welding or other means. It should be noted that this strip reinforcing bar does not form a constituent element of the present invention, so it may be provided as necessary.

Next, each columnar body 12 is stacked on a foundation (not shown) while being suspended by a crane (not shown). At the same time, a plurality of annular form frames 4a,
Arrange by stacking b ...

At the same time, as shown in FIGS. 1 and 2, a plurality of H-shaped steels, which are reinforcements, are provided in the space D surrounded by the outer shell F of the concrete columnar body 12 and the inner formwork 4. Build 3 When a plurality of concrete pillars 12 as shown in FIG.
The concrete columnar structure is constructed by pouring concrete into the concrete to form the concrete portion 2. After that, stacking of concrete columns and placing concrete are repeated until the construction of the concrete columnar structure is completed.

In the present embodiment, the case where the concrete columnar structure has a circular cross-sectional shape is shown. However, in addition to this, the concrete columnar structure having a polygonal cross-sectional shape such as a hexagon or an octagon is also used. It goes without saying that it can also be applied to things.

[0025]

As described above, in the concrete columnar structure of the present invention, a plurality of divided precast members are arranged in the circumferential direction, and the divided precast member and the annular member are mutually arranged by the annular member arranged on the inner peripheral surface. Since a plurality of columnar bodies are formed by connecting the above, the annular member bears the lateral pressure when the concrete is placed inside the outer shell of the concrete columnar structure by the circumferential tensile force. Functions as a support work.

Moreover, the annular member functions as it is as a reinforcing member without removing it. Therefore, the concrete columnar structure of the present invention has sufficient strength and durability even if it has a large cross-sectional area. In addition, since no separator is used, no separable holes are formed on the surface and the appearance is good.

Further, according to the method for constructing a concrete columnar structure of the present invention, a plurality of columnar bodies are formed by arranging divided precast members having an insert member embedded in the inner peripheral surface thereof, and the inner periphery of each columnar body is formed. Since each columnar body can be retained by simply fixing the annular member to each divided precast member by inserting the fastening member into the insert member of the divided precast member on the surface, and the annular body remains inside the structure as it is, The process for removing the support work is unnecessary.

Further, since it is not necessary to provide a scaffold for work on the outside of the concrete columnar structure, the construction becomes extremely easy. Further, since it is not necessary to wait for a curing period until concrete is hardened, work efficiency is significantly improved.

[Brief description of drawings]

FIG. 1 is a perspective view showing a construction state of an embodiment of a concrete columnar structure of the present invention.

FIG. 2 is a cross-sectional view of the concrete columnar structure shown in FIG.

FIG. 3 is a front view of a divided precast member used in one embodiment of the present invention.

FIG. 4 is a plan view of the split precast member of FIG.

5 is an end view of the split precast member of FIG.

6 is a cross-sectional view of a main part of the divided precast member of FIG.

FIG. 7 is a partial front view of a plate-shaped body formed by being connected by an annular member arranged on the inner peripheral surface of the divided precast in one embodiment of the present invention.

FIG. 8 is a plan view of the columnar body of FIG.

9 is an end view of the columnar body of FIG.

10 is a side view of a main part of the columnar body of FIG.

FIG. 11 is an explanatory diagram showing a load state with respect to a column state of lateral pressure when pouring concrete.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Concrete columnar structure 2 Concrete part 3 H-section steel (reinforcing material) 4 Inner formwork 10 Precast member 12 Columnar body 13 Inner peripheral surface of annular member 14 Annular member 15 Insert member 16 Female screw (connecting member) 17 Bolt (connecting) Material) F outer shell D space

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Minor Tabata Minoru Tabata 2-10-26 Fujimi, Chiyoda-ku, Tokyo Inside Maeda Construction Industry Co., Ltd. (72) Hiroya Okubo 2-3-2 Uchisaiwai-cho, Chiyoda-ku, Tokyo River Inside Saki Steel Co., Ltd. (72) Yugo Oka 2-3 2-3 Uchisaiwaicho, Chiyoda-ku, Tokyo Inside Kawasaki Steel Co., Ltd.

Claims (2)

[Claims] 1. A plurality of columnar bodies having a circular or polygonal cross section, which are formed by arranging a plurality of divided precast members in a circumferential direction and interconnecting them by an annular member arranged on an inner peripheral surface, are piled up to a predetermined height on a foundation. Concrete columnar structure, characterized in that it is composed of an outer shell formed as a result, a concrete portion placed inside the outer shell with a predetermined thickness, and a reinforcing material built in the concrete portion. Stuff. 2. A divided precast member having an insert member embedded in an inner peripheral surface thereof is arranged in the circumferential direction to form a plurality of columnar bodies having a circular or polygonal cross section, and an annular member is formed on the inner peripheral surface of each columnar body. Applying, a step of inserting the fastening member into the insert member exposed to the inner peripheral surface of the divided precast member to fix the annular member to each of the divided precast members, and to retain each of the columnar bodies, A method for constructing a concrete columnar structure comprising a step of stacking columnar bodies, building a reinforcing material inside thereof, and then placing concrete in the space.