JP3803413B2 - Concrete columnar structure and construction method thereof - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a concrete columnar structure and a construction method thereof, and in particular, can be suitably used for a pillar of a structure having a relatively large cross-sectional area, a bridge, a bridge pier, a chimney, a tank, a silo, a tower structure, and the like. is there.
[0002]
[Prior art]
To build a concrete columnar structure, such as a building column, stack a precast formwork with a cylindrical shape and use it as the outer shell of the structure. Was laid. 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 cross-sectional shape on site to form a columnar body. Then, the columnar bodies were piled up to a predetermined height, a reinforcing material was built inside, and further concrete was cast.
[0003]
[Problems to be solved by the invention]
As mentioned above, when constructing a concrete columnar structure, when assembling multiple divided precast forms on site, these precast forms must be able to withstand the lateral pressure of the concrete placed inside. I must. For that purpose, it was necessary to resist the lateral pressure from the outside by providing a support work on the outside of the precast formwork.
[0004]
According to the conventional construction method, it is necessary to attach and remove such a support work, and since a work scaffold for attaching the support work to the outside of the columnar structure is necessary, the construction of the columnar structure is troublesome. Met. In addition, since the support work cannot be removed until the curing period until the concrete hardens, there is a problem in terms of work efficiency.
[0005]
Furthermore, although it was also supported in the diametrical direction from the inside of the columnar structure with a separator or the like, in this case, the work inside the columnar structure is hindered and it is necessary to fill the hole from the outside. In addition, the so-called separation hole for supporting remains on the outer surface of the columnar structure, which makes it look bad.
[0006]
An object of the present invention is to provide a concrete columnar structure that is simple in construction and excellent in strength, durability, and appearance, and a construction method thereof.
[0007]
[Means for Solving the Problems]
The present invention relates to a concrete columnar structure and a construction method thereof, and has the following configuration in order to solve the above technical problem. That is, the concrete columnar structure of the present invention includes a plurality of columnar bodies having a circular or polygonal cross section in which a plurality of divided precast members are arranged in the circumferential direction and connected to each other by an annular member disposed on the inner circumferential surface. It is composed of an outer shell formed by stacking up to a predetermined height on a foundation, a concrete portion placed at a predetermined thickness inside the outer shell, and a reinforcing material built in the concrete portion. Features.
[0008]
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 precast mold, and if the cross-sectional shape of the columnar structure is circular, it is an arc shape. In accordance with the cross-sectional shape of the columnar structure, an appropriate shape can be obtained.
[0009]
The thickness of the concrete part is the distance between the outer periphery of the inner mold, the outer shell and the inner side when the inner mold is provided inside the columnar structure, and the columnar structure when the inner mold is not provided. Is an approximate value of the diameter of
[0010]
In addition, the divided precast member is manufactured using concrete or mortar as a base material, and one or two or more selected from steel fiber, stainless steel fiber, aramid, vinylon, carbon fiber, glass fiber is used as a reinforcing material. It can also be mixed.
[0011]
The annular member is made of iron, and steel such as structural steel is particularly preferable. Moreover, the reinforcing material built in the concrete part is a reinforcing bar and / or a steel frame, and the steel frame is preferably a section steel, particularly an H-section steel.
[0012]
The method for constructing a concrete columnar structure according to the present invention includes forming a plurality of columnar bodies having a circular or polygonal cross section by arranging divided precast members in which insert members are embedded on the inner peripheral surface in the circumferential direction, and each of the columnar bodies. An annular member is applied to the inner peripheral surface of the split precast member, a fastening member is inserted into the insert member exposed on the inner peripheral surface of the split precast member, and the circular member is fixed to the split precast member to fix the columnar bodies. and shape retention, and a step of stacking the respective columnar body, a step of Tatekomu reinforcement inside the columnar body, a step for pouring concrete between隔部the columnar body and the reinforcing material, from It is characterized by that.
[0013]
In the present invention, an inner mold can be disposed inside each stacked columnar body, and the reinforcing material can be built 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 mold can be made of concrete or tubular metal.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the concrete columnar structure and its construction method of the present invention will be described in more detail with respect 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.
[0015]
The concrete columnar structure 1 of the present embodiment is a viaduct bridge pier, and is formed by arranging a plurality of divided precast members 10 in the circumferential direction and connecting them with steel annular members 14 arranged on the inner peripheral surface 13. It is mainly composed of a plurality of columnar bodies 12 having a circular cross section. That is, the 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. A concrete inner formwork 4 is formed inside the outer shell F, and concrete is placed between the inner moldwork 4 and the outer shell F to form a concrete portion 2, and the concrete portion 2 is reinforced. A plurality of H-section steel 3 which is a material is built.
[0016]
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 at 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, six insert members 15 are embedded along the inner peripheral surface 13 in one row and in five rows in the height h direction. Each insert member 15 is formed with a female screw 16, and as is apparent from FIG. 6, an insertion port for the female screw 16 is exposed on the inner peripheral surface 13.
[0017]
Further, as shown in FIGS. 7 to 8, each of the divided precast members 10 arranged in the circumferential direction has five steel annular members 14 applied to the inner peripheral surface 13, and bolts 17 serving as connecting members. Is screwed into the insert member 15 through the hole formed in the annular member 14, thereby fixing the plurality of divided precast members 10 arranged in the circumferential direction in the circumferential direction to form the columnar body 12. That is, the columnar body 12 is retained by the annular member 14. The inner mold 4 is specifically formed by stacking a plurality of annular molds 4a, 4b,.
[0018]
In the embodiment of the present invention, when concrete is placed inside a concrete columnar structure, the side pressure P at the time of concrete placement acts on the columnar body 10 as shown in FIG. The reaction force is received by the connecting portion between 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.
[0019]
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.
[0020]
At this time, the annular member 14 is assigned to the inner peripheral surface 13 of each columnar body 12, and the bolt 17 as a fastening member is screwed into the female screw 16 provided on the insert member 15 exposed on the inner peripheral surface 13 of the divided precast member 10. The annular member 14 is fixed to each divided precast member 10. Each columnar body 12 is in the same state as if it had been shaped from the outside by a support work.
[0021]
In addition, the strip reinforcing bars 5 are arranged inside the columnar body 12 in parallel with the annular member 14. This band reinforcing bar is attached to the reinforcing bar fixing jig 6 orthogonal thereto by welding or other means. In addition, since this band reinforcement does not comprise the component of this invention, what is necessary is just to give as needed.
[0022]
Next, the columnar bodies 12 are stacked on a foundation (not shown) while being suspended by a crane (not shown). At the same time, a plurality of annular molds 4a, 4b,...
[0023]
At the same time, as shown in FIGS. 1 and 2, a plurality of H-section steels 3 as reinforcing materials are erected in the space D surrounded between the outer shell F of the concrete columnar body 12 and the inner mold 4. Include. When the concrete columnar bodies 12 as shown in FIG. 1 are stacked in a plurality of stages to be in a semi-finished state, the concrete is placed in the gap portion D to form the concrete portion 2, so that the concrete columnar structure can be constructed. Made. Thereafter, the stacking of the concrete columnar bodies and the placing of the concrete are repeated until the construction of the concrete columnar structure is completed.
[0024]
In the present embodiment, the concrete columnar structure has a circular cross-sectional shape. In addition, the concrete columnar structure also has a polygonal cross-sectional shape such as a hexagonal shape and an octagonal shape. Needless to say, it can be applied.
[0025]
【The invention's effect】
As described above, the concrete columnar structure of the present invention includes a plurality of divided precast members arranged in the circumferential direction, and a plurality of divided precast members and annular members connected to each other by an annular member disposed on the inner peripheral surface. Since the annular member bears the lateral pressure when the concrete is placed inside the outer wall of the concrete columnar structure with the tensile force in the circumferential direction, it functions as a support work. .
[0026]
Moreover, it functions as a reinforcing material without removing the annular member. Therefore, the concrete columnar structure of the present invention can obtain sufficient strength and durability even if the structure has a large cross-sectional area. In addition, since no separator is used, there is no separation hole on the surface and the appearance is good.
[0027]
Furthermore, according to the concrete columnar structure construction method of the present invention, a plurality of columnar bodies are formed by arranging divided precast members in which insert members are embedded on the inner circumferential surface, and divided into inner circumferential surfaces of the respective columnar bodies. Each columnar body can be retained simply by inserting a fastening member into the insert member of the precast member and fixing the annular member to each divided precast member, and the annular body remains inside the structure as it is. A process for removal becomes unnecessary.
[0028]
Further, since it is not necessary to provide a work scaffold outside the concrete columnar structure, the construction becomes extremely easy. And since it is not necessary to wait for the curing period until concrete hardening, work efficiency improves remarkably.
[Brief description of the 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.
4 is a plan view of the divided precast member of FIG. 3. FIG.
FIG. 5 is an end view of the divided precast member of FIG. 3;
6 is a cross-sectional view of a main part of the divided precast member in FIG. 3. FIG.
FIG. 7 is a partial front view of a plate-like body formed by being connected by an annular member disposed on the inner peripheral surface of a divided precast in an 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. 8. FIG.
10 is a side view of the main part of the columnar body of FIG. 8. FIG.
FIG. 11 is an explanatory view showing a load state with respect to a column state of a lateral pressure at the time of placing concrete.
[Explanation of symbols]
1 Concrete columnar structure 2 Concrete part 3 H-section steel (reinforcing material)
4 inner mold 10 precast member 12 columnar body 13 inner peripheral surface 14 of annular member annular member 15 insert member 16 female screw (connection member)
17 Bolt (connecting member)
F Outer D Spacing part

Claims (2)

An outer shell formed by stacking a plurality of columnar bodies having a circular or polygonal cross section formed by arranging a plurality of divided precast members in a circumferential direction and interconnecting them with an annular member disposed on an inner peripheral surface up to a predetermined height. When,
A concrete portion placed at a predetermined thickness inside the outer shell;
It is composed of a reinforcing material built in the concrete part,
A plurality of insert members are embedded in the inner peripheral surface of the divided precast member,
A plurality of holes are formed in the annular member,
The divided precast member is connected by a connecting member screwed into the insert member through a hole of the annular member, and is a concrete columnar structure.   A plurality of divided precast members in which insert members are embedded in the inner peripheral surface are arranged in the circumferential direction to form a plurality of columnar bodies having a circular or polygonal cross section, and an annular member is assigned to the inner peripheral surface of each of the columnar bodies. A step of retaining each columnar body by inserting a fastening member into the insert member exposed on the inner peripheral surface of the member and fixing the annular member to each of the divided precast members; and stacking each columnar body, A method for constructing a concrete columnar structure, characterized by comprising a step of building a reinforcing material inside and a step of placing concrete in the space.

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